JPH09101024A - Gas valve device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a front side safety valve 2 in a valve casing 1.
And a rear side flow rate adjusting valve 3, and in the gas valve device in which the rod 5 is moved forward and the safety valve 2 is pressed and opened at the time of ignition operation, the taper plug conventionally used as the flow rate adjusting valve is abolished. However, the number of parts is reduced to reduce costs. SOLUTION: The backward movement of a rod 5 by a return spring 5a after ignition is regulated at an intermediate position so that the rod 5 can be advanced and retracted between an intermediate position and a retracted end position by a thermal power adjustment operation. The flow rate adjusting valve 3 is composed of a needle valve, and its valve body 3b is integrally provided on the rod 5, and the amount of gas is reduced by retracting the rod 5 from an intermediate position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas valve device applied to a gas appliance such as a gas table, and more particularly to a gas valve device suitable for a rotary operation type for performing point extinguishing and thermal power adjustment by rotary operation. Regarding

[0002]

2. Description of the Related Art Conventionally, as a gas valve device of this type, a rotary valve comprising a safety valve and a taper plug which rotates integrally with an operating shaft for increasing / decreasing the amount of gas supplied to a burner is provided in a longitudinally extending valve casing. -Type flow rate adjustment valve and a rod that can be moved back and forth to press open the safety valve are provided, and when the operating shaft is normally rotated from the fire extinguishing position to the ignition position, the rod advances through the cam mechanism and the safety valve opens and opens. When the input of the rotational force in the forward rotation direction to the operating shaft is cut off at the ignition position, the rod retracts and the pressure of the safety valve is released, and the taper plug closes due to the reverse rotation of the operating shaft from the ignition position to the fire extinguishing position. It is known that the fire power was weakened by being rotated to.

The cam mechanism includes a cam fixed to the casing, a first follower engaged with the operating shaft so as to be slidable in the front-rear direction, and an engagement provided on the first follower. And a second follower that engages in a guide groove that is long in the front-rear direction and that rotates in the forward / reverse direction with the forward / reverse rotation of the first follower. Here, in the cam mechanism, the rod is moved back and forth in conjunction with the back and forth movement of the second follower.
No. 1 of the Japanese Patent Publication No. 63-2777, and the second type of Japanese Patent Publication No. Sho 63-2777, in which the rod is moved back and forth in conjunction with the back and forth movement of the first follower. There is.

In the cam mechanism of the first type, the first follower is guided by the cam in forward and reverse rotations thereof to be advanced and retracted, and the guide groove of the second follower is provided with a wide portion on the rear side. It is formed in a stepped shape having a narrow portion on the front side, and the engaging portion of the first follower is located between the wide portion and the narrow portion of the guide groove when the operating shaft is normally rotated from the extinguishing position to the ignition position. The second follower is prevented from retreating with respect to the first follower by engaging with the rearward step, and the rod advances from the retracted end position via the second follower due to the forward movement accompanying the forward rotation of the first follower. When the safety valve is pushed open by advancing to the end position and the input of the rotational force in the forward rotation direction to the operating shaft is cut off at the ignition position, the engaging portion of the first follower disengages from the step of the guide groove. Move to the narrow part that extends forward, and
The second follower and the rod are retracted to the retracted end position by the urging force of the return spring with respect to the follower.

Further, in the second type cam mechanism, the second type
The follower is guided forward and backward by the cam in forward and reverse directions, and the guide groove of the second follower is formed in a stepped shape having a front wide portion and a rear narrow portion. During normal rotation of the operation shaft from the fire extinguishing position to the ignition position, the engaging portion of the first follower engages with the forward step between the wide portion and the narrow portion of the guide groove, and the second follower The backward movement of the first follower with respect to the first follower is prevented, and the rod advances from the retracted end position through the first follower due to the forward movement of the second follower accompanying the forward rotation of the second follower through the first follower. When the safety valve is pushed open by advancing to the end position and the input of the rotational force in the forward rotation direction to the operating shaft is cut off at the ignition position, the engaging portion of the first follower disengages from the step of the guide groove. It moves to the narrow part that extends to the rear, and the first follower and the rod retract to the retracted end position by the urging force of the return spring with respect to the second follower. It has to. In any type, the second follower is slidably engaged with the taper stopper so that the supply gas amount is increased / decreased by the forward / reverse rotation of the taper stopper by the forward / reverse rotation of the second follower. There is.

[0006]

In the case where the taper plug is used as the flow rate adjusting valve as in the above-mentioned conventional example, the number of parts is increased, and the work of sliding the valve casing and the taper plug or applying grease is required. Assembling man-hours increase,
The cost is high. In view of the above points, it is an object of the present invention to omit the taper plug, which has been indispensable in the rotary operation type gas valve device, and to achieve cost reduction.

[0007]

Means for Solving the Problems In order to solve the above problems,
In the present invention, in the valve casing that is long in the front-rear direction,
Provided with a safety valve on the front side, a flow rate control valve on the rear side to increase / decrease the amount of gas supplied to the burner, and a rod that can be moved back and forth, and an operation shaft that can be rotated forward and backward between the fire extinguishing position and the ignition position. And a cam mechanism that converts the rotation of the
In the rotary operation type gas valve device in which the rod is moved forward from the backward end position to the forward end position by the forward rotation of the operating shaft from the fire extinguishing position to the ignition position against the spring to push the safety valve open. When the input of rotational force in the forward rotation direction to the operating shaft is cut off at the ignition position, the mechanism releases the restraint of the rod at the forward end position and restricts the backward movement of the rod by the return spring at the intermediate position to extinguish the fire from the ignition position. The rod is retracted from the intermediate position to the retracted end position by reversing the operation shaft to the position, and the flow rate adjusting valve is configured by the needle valve, and the valve body of the needle valve is integrally provided on the rod, The amount of gas supplied to the burner is increased or decreased as the rod moves back and forth between the intermediate position and the retracted end position. In this way, by integrating the flow rate adjusting valve with the rod, a taper plug is not required, the number of parts can be reduced, and the number of assembly steps can be reduced by eliminating the need for sliding and grease coating, resulting in a significant cost reduction. be able to.

The cam mechanism is the same as that of the above-mentioned conventional example, namely, the cam fixed to the valve casing, the first follower engaged with the operating shaft in a rotation preventing manner and the first follower. It is possible to use the one provided with a second follower that engages with the provided engaging portion in a guide groove that is long in the front-rear direction and that rotates forward and reverse with the forward and reverse rotation of the first follower. The rod is moved back and forth in conjunction with the forward / backward movement of one of the first and second followers, and the other follower is guided by the cam in forward and reverse rotations thereof to move forward and backward. The guide groove is formed in a stepped shape having a wide portion and a narrow portion so as to be retracted, and at the time of forward rotation from the fire extinguishing position of the operating shaft,
The engaging portion of the first follower engages with the step between the wide portion and the narrow portion of the guide groove to prevent the one follower from retreating with respect to the other follower, so that the operation shaft is positively moved. When the input of the rotational force in the rolling direction is cut off, the engaging portion of the first follower moves to the narrow portion of the guide groove, and the one follower is biased by the return spring with respect to the other follower. To retreat with
Unlike the conventional example, the longitudinal length of the narrow portion of the guide groove is set so that the retracted distance from the forward end position of the rod is equal to the distance between the forward end position and the intermediate position of the rod. Then, when the input of the rotational force in the normal rotation direction to the operation shaft is cut off at the ignition position, the backward movement of the rod by the return spring is restricted at the intermediate position. In the embodiment described later, the cam mechanism of the second type of the conventional example in which the rod is moved back and forth by interlocking with the first follower is used, but the rod is moved back and forth by interlocking with the second follower. It is also possible to use the above-mentioned first type cam mechanism of the related art, which is moved.

Further, the ratio of the moving distance of the other follower in the front-rear direction to the rotation angle of the operating shaft is determined by the position of the other follower at the fire extinguishing position of the operating shaft and from this position before and after the narrow portion of the guide groove. If the cam is formed so as to be larger than the other range in the range between the position and the position apart from the front by a length substantially equal to the directional length, as will be described in detail in later-described embodiments, the operating shaft with adjustable heat power can be provided. There is an advantage that the rotation angle range of can be widened and the fine adjustment of the thermal power becomes easy.

By the way, even if the number of parts is reduced by omitting the taper plug, when assembling the components of the safety valve, the rod, and the cam mechanism directly into the valve casing, if the assembling work is divided into parts, the parts in the middle of transportation can be reduced. Therefore, it is necessary to concentrate a large number of parts in one work place and assemble them in the valve casing, resulting in poor workability. On the other hand, a first inner case that can be inserted into and removed from the front inner periphery of the valve casing and a second inner case that can be inserted into and removed from the rear inner periphery of the valve casing are provided, and the safety valve, the rod, and the return rod can be returned to the first inner case. If the cam unit is configured by assembling the valve unit by assembling the spring with the spring, and the cam mechanism component is housed in the second inner case, it is possible to divide the assembly work and improve workability. Therefore, the cost can be further reduced. In addition, before assembling the valve unit and cam mechanism unit into the valve casing, each unit can be inspected for abnormalities such as missing parts, reducing the incidence of defective products in the final inspection process. The property is improved.

Even if the above-mentioned cam mechanism is not used, the rod is restrained at the forward end position after the safety valve is pressed open and ignited, and the backward movement of the rod by the return spring is regulated at the intermediate position. If the operation mechanism is configured so that the rod is advanced and retracted between the intermediate position and the retracted end position by the adjustment operation, the flow rate adjustment valve is configured with a needle valve having a valve body integrated with the rod to adjust the heat power. be able to.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a valve casing which is long in the front-rear direction (the right side in FIG. 1 is the front), and a safety valve 2 is provided in the casing 1 in order from the front.
, A flow rate adjusting valve 3 and a pilot valve 4 are provided, and a gas flowing in from an inlet 1a opened on the outer peripheral surface of the front part of the valve casing 1 is passed through the safety valve 2 and the flow rate adjusting valve 3 to the middle of the valve casing 1. The amount of gas supplied to the main burner (not shown) connected to the main outlet 1b through the pilot valve 1 to the main outlet 1b opened on the outer peripheral surface of the part and to the pilot outlet 1c opened behind the main outlet 1b. Is adjusted by the flow rate adjusting valve 3 so that the gas supply to the pilot burner (not shown) connected to the pilot outlet 1c is cut off by the pilot valve 4.

The safety valve 2 includes an electromagnet 2b housed in a magnet case 2a, which is excited by an output of a thermocouple (not shown) for detecting a flame of a burner, and an adsorption piece 2 facing the electromagnet 2b.
c and a valve element 2f which is connected to the suction piece 2c through a valve rod 2d and is urged to the rearward closing side by a spring 2e. Further, a rod 5 which is movable back and forth is provided in the valve casing 1, and an operation shaft 6 which can be rotated forward and backward between a fire extinguishing position and an ignition position is provided at a rear end portion of the valve casing 1.
And a cam mechanism 7 for converting the rotation of the operating shaft 6 into the forward / backward movement of the rod 5, and the rod 5 is returned from the backward end position to the forward end position by forward rotation of the operating shaft 6 from the fire extinguishing position to the ignition position. 5a is advanced and the safety valve 2 is pressed and opened by the contact of the rod 5 with the valve body 2f. When the safety valve 2 is pressed and opened, the adsorption piece 2c comes into contact with the electromagnet 2b, and when the burner is ignited in this state, the adsorption piece 2c is generated by the output of the thermocouple.
c is attracted to the electromagnet 2b, and the safety valve 2 is held in the open state. In the figure, 2g is a socket for the electromagnet 2b.

A front chamber 1d for accommodating the safety valve 2 and a rear chamber 1e for accommodating the cam mechanism 7 are formed in the valve casing 1, and further, between the front chamber 1d and the rear chamber 1e.
A valve hole 3a for the flow rate adjusting valve 3 communicating with the front chamber 1d and a valve hole 4a for the pilot valve 4 communicating with the valve hole 3a are formed, and the rod 5 is inserted through these valve holes 3a, 4a. ing.

The flow rate adjusting valve 3 can be inserted into the valve hole 3a,
It is composed of a needle valve having a tapered valve body 3b that expands in diameter toward the front. The valve body 3b is integrally molded with the rod 5, and the rod 5 retracts from the intermediate position shown in FIG. 2 (B). At this time, the valve body 3b is inserted into the valve hole 3a so that the supply gas amount is throttled according to the insertion depth, and the large diameter valve body 3c made of an elastic body such as rubber is provided on the front side of the valve body 3b.
So that when the rod 5 is retracted to the retracted end position shown in FIG. 1, the valve body 3c is seated on the opening surface of the valve hole 3a to close the valve hole 3c and shut off the gas supply to the burner. did.

In the rotary operation type gas valve device, a taper plug which is rotated by an operation shaft is generally used as a flow rate adjusting valve, but according to the present embodiment, the rod 5 for pressing and opening the safety valve 2 is used. Since the flow rate adjusting valve 3 can be integrated, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced, which is advantageous.

The pilot valve 4 is composed of a spool valve having a valve body 4b consisting of a small diameter portion formed at the rear portion of the rod 5 and a large diameter portion in front of and behind the rod 5, and a pair of front and rear O-rings are provided in the valve hole 4a. When the rod 4 is advanced to the forward end position shown in FIG. 2 (A) when the spacers 4c and 4d are installed with the spacer 4e interposed therebetween, the small diameter portion of the valve body 4b is the O-ring 4 on the front side.
c, the pilot valve 4 is opened, the rod 5
As shown in FIG. 2 (B), the large diameter portion of the front side of the valve element 4b is tightly fitted to the O-ring 4c when the vehicle retracts from the forward end position so that the pilot valve 4 is closed. When the pilot valve 4 is opened, the rear large diameter portion of the valve body 4b is fitted into the rear O-ring 4d to prevent gas leakage to the rear of the valve hole 4a.

A first inner case 8 which can be inserted into and removed from the front chamber 1d of the valve casing 1 and a second inner case 8 which can be inserted into and removed from the rear chamber 1e.
An inner case 9 is provided, and the safety valve 2, the rod 5 and the return spring 5a are assembled to the first inner case 8 to form a valve unit, and the second inner case 9 has a cam mechanism 7 which will be described in detail later. A cam mechanism unit was constructed by housing the parts. According to this, it is possible to assemble the gas valve device by assembling the valve unit and the cam mechanism unit, which are sub-assembled in advance, to the valve casing 1, and it is possible to divide the assembling work and improve workability. In addition, since it is possible to inspect each unit for the presence or absence of an abnormality before assembling to the valve casing 1, it is possible to reduce the occurrence rate of defective products in the final inspection process and improve the productivity.

The first inner case 8 is made of resin, and the safety valve 2
A valve seat 2h on which the valve body 2f is seated, and a ring-shaped rod guide 8a located behind the valve seat 2h, which is connected to the valve seat 2h via legs 8b at a plurality of peripheral portions, are integrally formed. There is. Then, the safety valve 2 is inserted into the first inner case 8 from the front, and the engagement hole 8c formed in the front end portion of the first inner case 8 is inserted.
The safety valve 2 is prevented from coming off by engaging a claw portion 2i protruding from the outer peripheral surface of the magnet case 2a of the safety valve 2 with the shoulder portion of the first inner case 8 formed by the rear end surface of the valve seat 2h. ,
The collar 5c formed at the front end of the rod 5 is pushed into the rod guide 8a while the return spring 5a is provided between the spring receiver 5b formed also on the rod 5 and also serving as a retainer for the valve body 3c. I'm holding it. The first inner case 8
An opening 8d that matches the inlet 1a of the valve casing 1 is formed on the peripheral wall of the valve casing 1. When the safety valve 2 is opened, the opening 1d is opened from the inlet 1a to the inside of the first inner case 8 and to the valve seat 2h. Gas is allowed to flow to the flow rate adjusting valve 3 via. In the figure, 8e is a claw portion formed on the first inner case 8, and the claw portion 8e is engaged with the opening edge of the inlet 1a to prevent the opening 8d from being displaced from the inlet 1a. doing.

By the way, the distance between the rod 5 and the valve body 2f of the safety valve 2 in the fire extinguishing position (state of FIG. 1) depends on the dimensional tolerances of various parts such as the valve casing 1, the safety valve 2, the rod 5 and the cam mechanism 7. Since the accumulated error causes variations, the stroke of the rod 5 by the cam mechanism 7 is set to a long stroke, and the safety valve 2 is pressed and opened before the rod 5 reaches the forward push-off position by the cam mechanism 7, and Even if such variations occur, it is desirable to ensure that the adsorption piece 2c is pressed against the electromagnet 2b of the safety valve 2. In this case, it is necessary to prevent an unreasonable force from acting on the safety valve 2, the rod 5, and the cam mechanism 7 when the cam mechanism 7 advances after the safety valve 2 is pressed and opened. For this reason, conventionally, a washer that is pushed forward by a cam mechanism, which is retained by a stopper at the rear end of the rod and is pushed forward by a cam mechanism, is slidably externally attached to the rear of the rod, and the washer is attached to the rear by a return spring. When the cam mechanism is advanced after the safety valve is pressed and opened, the washer moves forward relative to the rod while compressing the second spring. However, the forward force of the cam mechanism is absorbed by the second spring. However, in this structure, the rod has to be inserted into the valve casing from the rear, and as in the present embodiment, the rod 5 is provided with the large-diameter valve body 3c, or the rod 5 and the safety valve 2 are unitized. Becomes difficult. Further, since the washer, the second spring and the snap ring for receiving the spring fitted to the rod are required, the number of parts is increased and the assembling is time-consuming and the cost is high. Further, when the rod is retracted from the forward end position by releasing the restraint of the rod by the cam mechanism, the rod is moved to the forward end position until the washer retracts due to the urging force of the return spring and contacts the stopper at the rear end of the rod. Remains in contact with the valve body of the safety valve, and the shock of the washer colliding with the stopper is transmitted to the valve body of the safety valve via the rod, and this shock releases the attraction of the attraction piece 2c to the electromagnet 2b. The safety valve 2 may close.

Therefore, in this embodiment, a cushion member 5d made of an elastic material such as rubber is attached to the front end of the rod 5, and the cushion member 5d is compressed when the cam mechanism 7 advances after the safety valve 2 is opened by pressing. I was made to do it. According to this, the advancing force of the cam mechanism 7 is absorbed by the cushion member 5d, an unreasonable force does not act on the safety valve 2, the rod 5, and the cam mechanism 7, and the number of parts is reduced to reduce the cost. Moreover, since there is no member such as the above washer that gives an impact to the rod 5 when the rod 5 retracts from the forward end position, the safety valve 2 can be prevented from being closed unnecessarily. The cushion member 5d may be attached to the rear end of the rod 5 or both front and rear ends of the rod 5. Further, although the cushion member 5d is formed in a cap shape in the present embodiment, it may be formed in a cylindrical shape.

As shown in FIG. 3, the cam mechanism 7 includes a cam 70 fixed to the valve casing 1 and an operating shaft 6.
A first follower 71, which is engaged with the rotation stopper so as to be movable back and forth,
A second follower 72 that engages with an engaging portion 71a provided on the first follower 71 in a guide groove 72a that is long in the front-rear direction, and that rotates forward and reverse with the forward and reverse rotation of the first follower 71. There is. Then, the rear end of the rod 5 is brought into contact with one of the first and second followers 71, 72, which is the first follower 71 in the present embodiment, to interlock with the back-and-forth movement of the first follower 71. The rod 5 is moved back and forth, and the second follower 72 is guided forward and backward by the cam 70 in its forward and reverse rotations.

To explain this in detail, in the present embodiment, the cam 70 is made of a resin-made cylindrical cam integral with the second inner case 9, and the resin-made cylindrical second cam inserted in the cam 70 is used. By providing a pin-shaped engaging portion 72b on the outer peripheral surface of the follower 72,
The engaging portion 72b is engaged with the spiral cam groove 70a as shown in FIG. 5 which is inclined forward in the forward direction formed on the cam 70, and the second follower 72 is forward and backward in the forward and backward directions. I try to move forward and backward. The cam 70 is formed with a vertical groove 70b extending rearward from an end of the cam groove 70a in the reverse direction, and when the second follower 72 is inserted into the cam 70 from the rear side, the engaging portion 72b has a vertical groove 70b. Through the cam groove 70a, and further, a thin groove lid portion 70c is provided on the outer periphery of the rear end portion of the vertical groove 70b, and the engaging portion 72b is provided with the vertical groove 70b.
When it is inserted into, the engaging portion 72b pushes the groove lid portion 70c radially outward by the wedge action of the inclined surface formed at the outer end of the engaging portion 72b and slips through the groove lid portion 70c. 2 The follower 72 is prevented from coming off.

Guide groove 72a formed in the second follower 72
, As shown in FIG. 6, the narrow portion 72a ₂ of the front wide portion 72a ₁ and the rear, forward of the stepped shape having a step 72a ₃ between the wide portion 72a ₁ and the narrow portion 72a ₂ Is formed on the second follower 72, and engages the guide portion 72a with an engaging portion 71a formed of a protrusion protruding from the outer peripheral surface of the resin-made cylindrical first engaging element 71 that is inserted into the second follower 72. The first follower 71 is formed with a blind hole-shaped shaft hole 71b having an irregular cross-sectional shape, and the front half of the operating shaft 6 formed in the irregular cross-sectional shape is inserted into the axial hole 71b, so that The follower 71 is slidably engaged with the detent. The guide groove 72a
The wide portion 72a ₁ of the first follower 71 is connected to the second follower 72.
Although it is extended to the front end of the second engaging element 72 so that the rod 5 can be inserted from the front side, the narrow portion 72a ₂ is arranged so as to restrict the backward movement of the rod 5 from the forward end position at the intermediate position. 2 The follower 72 ends at a position before the rear end.

The second inner case 9 which is integral with the cam 70 is formed into a bottomed cylindrical shape which opens rearward, and has a second follower 72.
When the first follower 71 is inserted into the cam 70, the bottom wall 9a at the front end of the second inner case 9 causes the first and second followers 71 and 72 to move into the second inner case. 9, the first follower 71 is retained rearward with respect to the second follower 72, and the second follower 72 is retained rearward with respect to the second inner case 9. The first and second followers 71, 72 are housed and held in the second inner case 9 while being prevented from slipping out in both front and rear directions, and a cam mechanism unit is configured.

On the outer peripheral surface of the second inner case 9, a pair of protrusions 9b, 9b are formed at two positions around the rear part thereof, and are formed at two positions around the rear chamber 1e of the valve casing 1. The recesses 1f, 1f are formed, and the protrusions 9a are formed in the recesses 1f.
The second inner case 9 is prevented from rotating with respect to the valve casing 1, and the cam 70 integrated with the second inner case 9 is fixed to the valve casing 1. Further, the through hole 9c is formed in the bottom wall portion 9a at the front end of the second inner case 9, and the rear end portion of the rod 5 is brought into contact with the front end surface of the first follower 71 through the through hole 9c. . A cam formed separately from the second inner case 9 can be housed and fixed, but in order to reduce the number of parts and reduce the cost, as in the present embodiment, the second inner case 9 can be used. Inner case 9
It is desirable that the cam 70 be integrally molded.

At the rear end of the valve casing 1, a shaft guide 10 for inserting and supporting the operating shaft 6 is attached. As shown in FIG. 3, the shaft guide 10 is composed of a base plate 10a and a guide plate 10b assembled to the base plate 10a via leg portions 10c at both ends extending forward, and the base plate 10a and the guide plate 10a. Shaft holes 10d and 10e, through which the operating shaft 6 is inserted, are formed in the shaft 10b, respectively, so that the operating shaft 6 can be stably supported with a span in the front-rear direction that is the axial direction thereof. Further, the base plate 10a and the guide plate 10b are provided with stopper portions 10f and 10g extending rearward and forward, respectively, and a fan-shaped outer peripheral portion of an intermediate portion of the operation shaft 6 located between the base plate 10a and the guide plate 10b. A fire extinguishing position shown in FIG. 4 (A) in which the flange 6b having the projection 6a is formed and the fan-shaped projection 6a abuts on the stopper 10g, and the fan-shaped projection 6a abuts on the stopper 10f.
The operating shaft 6 is made to rotate forward and backward between the ignition position shown in FIG.

The base plate 10a has a piezoelectric element 11a and
A piezoelectric ignition unit 11 including a hammer 11b and a drive plate 11c is provided, and when the operating shaft 6 is normally rotated from the fire extinguishing position, the hammer 11b is retracted through the drive plate 11c against the spring 11d, Drive plate 11c at ignition position
Was released from the hammer 11b and the piezoelectric element 11a was hit by the hammer 11b, and the burner was ignited via the pilot burner by the spark from the ignition electrode (not shown) connected to the piezoelectric element 11a. The drive plate 11c is urged forward by a spring 6c provided between the drive shaft 11c and the flange 6b of the operation shaft 6, and when the operation shaft 6 is reversed to the fire extinguishing position,
The hammer 11b is overcome against the biasing force of the spring 6c to return to the position shown in FIG. 4 (A).

Further, the operation shaft 6 is formed with two first protrusions 6d, 6d located on the rear surface of the flange 6b, and the operation shaft 6 is provided in the shaft hole 10e of the guide plate 10b. At the fire extinguishing position, the pair of recessed portions 10h, 10h are located at the hole edge portion where both the first projections 6d, 6d coincide with each other.
When the operating shaft 6 is returned to the fire extinguishing position, each first projection 6d is fitted into each recess 10h by the backward biasing force of the spring 6c, and the operating shaft 6 is engaged in the fire extinguishing position. Therefore, when the operating shaft 6 is normally rotated from the fire extinguishing position to the ignition position, it is necessary to push the operating shaft 6. Then, the second protrusions 6e, 6e at two locations are formed on the portion of the operation shaft 6 projecting rearward of the guide plate 10b, and the pushing stroke of the operation shaft 6 is applied to the guide plate 10b by the second protrusions 6e, 6e. I made it possible to regulate by contact.

The guide plate 10b abuts the base plate 10a at a flange portion 10i curved at the front end of its leg portion 10c, and has an edge of the base plate 10a at a claw portion 10j curved at the outer end of the flange portion 10i. It engages with the notch 10k formed in the above, and is locked in a state of being positioned with respect to the base plate 10a.

When assembling the shaft unit consisting of the operating shaft 6 and the shaft guide 10, first, the rear half of the operating shaft 6 is inserted into the shaft hole 10e of the guide plate 10b from the front side, and the second projection 6e is recessed. Guide plate 10 through 10h
b to the rear side, and then the operating shaft 6 is attached to the fan-shaped protrusion 6a.
Reverse to the fire extinguishing position where
The first projection 6d is fitted in the recessed portion 10h to stop the operation shaft 6 from rotating. Here, the second projection 6e is formed with a slight phase difference in the normal rotation direction with respect to the first projection 6d, and at the fire extinguishing position, the second projection 6e is disengaged from the recessed portion 10h, and the operation shaft 6 is The guide plate 10b is prevented from coming off backward.

Next, the spring 6c and the drive plate 11c are externally attached to the front half of the operating shaft 6 in this order, and then the guide plate 10b is locked to the base plate 10a as described above to assemble the shaft unit. In this assembled state, the forward rotation of the operating shaft 6 is restricted at a predetermined ignition position by the stopper portion 10f bent on the base plate 10a, and this ignition position is a position where the second protrusion 6e matches the recessed portion 10h (first position). Since the two protrusions 6e are set in front of the position where the two protrusions 6e are inserted into the recessed portion 10h), the operation shaft 6 will not drop from the shaft guide 10 thereafter.

The operation shaft 6 is made of a die-cast product made of a metal such as a zinc alloy having a good bathing property, and the direction of the diameter line which coincides with one side edge of the fan-shaped projection 6a is the die-cutting direction. The first protrusion 6d is formed on the diameter line, and the second protrusion 6e is formed in parallel with the diameter line at a position slightly offset from the diameter line in the normal direction.

In this embodiment, the base plate 10a is formed with the ignition position stopper portion 10f and the guide plate 10b is formed with the fire extinguishing position stopper portion 10g. However, the base plate 10a is formed with the fire extinguishing position stopper portion. 10g, guide plate 10
You may form the stopper part 10f for ignition positions in b.
In this case, when assembling the operation shaft 6 to the guide plate 10b,
The second projection 6e is inserted into the recessed portion 10h in a phase in which the operation shaft 6 is offset in the reverse direction from the fire extinguishing position, but if the guide plate 10b is assembled to the base plate 10a, the operation shaft 6
Since the reverse rotation beyond the fire extinguishing position is blocked by the fire extinguishing position stopper portion 10g formed on the base plate 10a, the second protrusion 6e does not coincide with the recessed portion 10h, and the operation shaft 6 is not attached to the shaft guide 10. It is prevented from falling out. It is possible to form both stoppers 10f and 10g on the base plate 10a. In this case, however, rotation of the operating shaft 6 in both forward and reverse directions is restricted until the guide plate 10b is combined with the base plate 10a. It becomes impossible, and therefore the guide plate 10b
When the base plate 10a and the base plate 10a are combined, it is necessary to rotate the operation shaft 6 so that the fan-shaped projection 6a is inserted between the stoppers 10f and 10g, which deteriorates workability. On the other hand, if the stoppers 10f and 10g are separately provided on the base plate 10a and the guide plate 10b as described above, the fan-shaped projection 6a is brought into contact with the stopper formed on the guide plate 10b. Easily the base plate 10a and the guide plate 10b
And can be combined, which is advantageous. Particularly, if the stopper portion formed on the guide plate 10b is the stopper portion 10g for the fire extinguishing position as in this embodiment, the first protrusion 6d is recessed into the concave portion 10h using the stopper portion 10g as a guide as described above.
The base plate 1 with the operating shaft 6 stopped
0a and the guide plate 10b can be combined, and workability is further improved.

The second inner case 9 has the both protrusions 9
A pair of claw pieces 9d and 9d extending rearward from b and 9b are integrally formed, and the cam mechanism unit is provided with both claw pieces 9d and 9d.
In the above, the shaft guide 10 is engaged with the shaft guide 10 so that an operation unit including a cam mechanism unit and a shaft unit can be configured.

To explain this in detail, in this embodiment, a pair of transparent windows 1 located on both sides of the shaft hole 10d in the base plate 10a.
0l, 10l and the leg portions 10c at both ends of the guide plate 10b,
A pair of engaging holes 10m and 10m are formed in 10c, each claw piece 9d is engaged with each engaging hole 10m through each through window 101, and further, an engaging hole 10n is formed in the base plate 10a. ,
A projection 9e protruding from the rear end surface of the second inner case 9 was fitted into this. In this way, by engaging the claw piece 9d with the guide plate 10b, the guide plate 10b does not easily separate from the base plate 10a, and the handling of the operation unit after subassembly is facilitated.

In the operation unit, the second inner case 9 is inserted into the rear chamber 1e of the valve casing 1 and the base plate 1
0a and the guide plate 10b are fastened together with the rear end of the valve casing 1 at the joint of the flange portion 10i to the base plate 10a, so that the valve casing 1 is assembled, and then the knob 12 is attached to the operating shaft 6. Complete the assembly.

Next, the operation of the gas valve device of this embodiment will be described. When igniting the burner, first, the operating shaft 6
Is pushed to separate the first projection 6d from the recess 10h, and then the operating shaft 6 is normally rotated from the fire extinguishing position to the ignition position. Here, in the fire extinguishing position, the engaging portion 72 of the second follower 72
b is in the position of the cam groove 70a of the cam 70 shown in FIG. 5a, and the engaging portion 71a of the first follower 71 is in the position of the guide groove 72a of the second follower 72 shown in FIG. 6a. . When the operation shaft 6 is normally rotated from the fire extinguishing position, the engaging portion 71a moves to the position of the guide groove 72a shown by b in FIG. 6 and the wide portion 72a ₁
Of the first follower 71, the second follower 72 rotates in the forward direction through the first follower 71, and is guided by the cam groove 70a to the second follower 72.
The follower 72 moves forward. In this case, since the engaging portion 71a is engaged with the forward of the step 72a ₃ of the guide groove 72a, the first follower 71 is advanced along with the advancement of the second follower 72, the rod 5 is first driven Return spring 5 pushed by child 71
It moves forward from the backward end position against a. At the ignition position, the engaging portion 72b moves to the position of the cam groove 70a shown by b in FIG. 5, the rod 5 advances to the advance end position as shown in FIG. 2 (A), and the safety valve 2 is pressed and opened. At the same time, the pilot valve 4 is opened, and the piezoelectric ignition unit 11 is operated to ignite the burner.

After ignition, remove the hand from the knob 12 and operate the operation shaft 6
When the input of the rotational force in the normal rotation direction to the engaging portion 7 is stopped, the return force of the return spring 5a acting on the first follower 71 via the rod 5 causes the operating shaft 6 to slightly reverse and rotate.
1a goes over the step 72a ₃ and moves to the narrow portion 72a ₂ of the guide groove 72a, and the first follower 71 and the rod 5 retract. Then, when the engaging portion 71a moves to the position indicated by c in FIG. 6 and comes into contact with the rear end of the narrow portion 72a ₂ , further backward movement of the first follower 71 is prevented, and the forward end of the rod 5 is prevented. Retraction from the position is stopped at the intermediate position shown in FIG. At this intermediate position, the pressure of the safety valve 2 is released and the pilot valve 4 is closed, but the flow rate adjusting valve 3 is in the fully open state and the burner is maintained in the high-fire state.

When the operating shaft 6 is reversed from the ignition position, the first
The second follower 72 is reversely rotated via the follower 71, guided by the cam groove 70a, and the second follower 72 retracts from its forward end position, and following this retreat, the first follower 71 and the rod 5 are moved. And retract from the middle position. In this case, the flow control valve 3 throttles the amount of gas supplied to the burner, and the heating power of the burner is weakened. Then, the engaging portion 72b is connected to the cam groove 70.
When a is moved to a position indicated by c in FIG. 5, the large-diameter valve body 3c of the flow rate adjusting valve 3 is seated on the opening surface of the valve hole 3a, the flow rate adjusting valve 3 is closed, and the burner is extinguished. Thus, after ignition, the burner heat power can be adjusted by rotating the operating shaft 6 forward and backward in the angular range between b and c in FIG.

When the flow rate adjusting valve 3 is closed as described above, the rod 5 cannot move backward anymore, and therefore the closed position of the flow rate adjusting valve 3 becomes the retracted end position of the rod 5. In this case, before the rod 5 reaches the retracted end position, the first follower 7
When the retreat of 1 is blocked, the flow rate adjusting valve 3 cannot be closed. Therefore, when the engagement portion 72b is in the position of c in FIG. 5, it is set so that a slight gap is secured between the first follower 71 and the base plate 10a, and the operation shaft 6 is set to the extinguishing position. When moving the engaging portion 72b from the position c in FIG. 5 to the position a in the reverse direction, the first follower 71 is retracted by this gap to move the first follower 71 from the rear end of the rod 5 by the gap. Therefore, the flow control valve 3 can be prevented from being defectively closed due to dimensional tolerance.

When the first follower 71 comes into contact with the base plate 10a and is prevented from further retracting, thereafter, the second follower 7 is pressed.
Only 2 moves backward, the engaging portion 71a moves forward relative to the guide groove 72a, and when the operating shaft 6 is returned to the fire extinguishing position, the engaging portion 71a returns to the position indicated by a in FIG. .

By the way, the cam groove 70a is formed in the positions a and b in FIG.
However, in this case, the position of the cam groove 70a corresponding to the retracted end position of the rod 5 is displaced from c to c ′ in FIG. And c'are narrowed, making it difficult to fine-tune the heat power. Therefore, in the present embodiment, the ratio of the movement distance of the second follower 72 in the front-rear direction to the rotation angle of the operation shaft 6 is the position of the second follower 72 at the fire extinguishing position of the operation shaft 6 and the guide groove 72a from this position. The cam 70 is formed so as to be larger than the other range in the range between the position apart from the front by a length substantially equal to the length of the narrow portion 72a _{2 in} the front-rear direction, that is, in FIGS. The inclination angle of the portion of the cam groove 70a between the two is widened so that the angle range between b and c where the thermal power can be adjusted can be widened, and the fine adjustment of the thermal power can be facilitated.

Although the manual operation of the operating shaft 6 has been described above, the present invention can also be applied to a remote control type gas valve device using a motor, an example of which is shown in FIG. The basic configuration of the gas valve device shown in FIG. 7 is not particularly different from that of the above-described embodiment, the same members as those in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the case shown in FIG. 7, the valve casing 1
A gear box 100 is provided at the rear part of the
Inside, a motor 101, an operating shaft 102 arranged orthogonal to the axis of the rod 5, and a gear 101 on the output shaft of the motor 101.
The gear train 103 that connects the gear a with the operating shaft 102 is housed. A cam 104 that constitutes a cam mechanism is integrally formed with the operation shaft 102. The cam 104 has a minimum diameter portion 104a on one side of the periphery, a maximum diameter portion 104b on the other side, and an intermediate diameter portion 104c adjacent to the maximum diameter portion 104b with a step, and the minimum diameter portion 104a.
From the maximum diameter portion 104b to the intermediate diameter portion 1
The diameter is reduced from 04c toward the minimum diameter portion 104a.

A fire extinguishing button 106, a strong button 107, and a weak button 108 are arranged on the operation panel 105, and a control circuit 109 for controlling the motor 101 according to button operation is provided. In this case, when the fire extinguisher button 106 is pressed once, the motor 101 is driven to operate the operation shaft 102.
Where the smallest diameter portion 104a of the cam 104 rotates clockwise from the extinguishing position where it abuts the rod 5, and the operating shaft 102 rotates to the ignition position where the largest diameter portion 104b of the cam 104 abuts the rod 5. The motor 101 is temporarily stopped, the motor 101 is re-driven after the forced hold time of the safety valve 2, and the motor 101 is stopped when the operation shaft 102 is rotated to a position where the intermediate diameter portion 104c of the cam 104 contacts the rod 5. After that, when the weak button 108 and the strong button 107 are pressed, the operating shaft 102 moves clockwise and counterclockwise in a range in which the cam portion between the intermediate diameter portion 104c and the minimum diameter portion 104a contacts the rod 5. When the motor 101 is driven so as to be rotated in the vertical direction and the fire extinguishing button 106 is pressed again, the motor 101 is operated by the motor 101
The control circuit 109 is configured to rotate 2 in the clockwise direction and stop the motor 101 when the operation shaft 102 is rotated to the fire extinguishing position.

When the operating shaft 102 is rotated to the ignition position by the first push operation of the fire extinguisher button 106, the rod 5 advances to the forward end position, the safety valve 2 is pressed and opened, and the pilot valve 4 is opened. At the same time, the ignition switch linked to a cam (not shown) on the operating shaft 102 is closed to ignite the burner. Then, when the safety valve 2 is adsorbed and held in the valve open state by the output of the thermocouple that detects the flame of the burner, the operation shaft 102 is rotated to a position where the intermediate diameter portion 104c of the cam 104 contacts the rod 5, and the rod 5 Moves backward from the forward end position to the intermediate position. At this intermediate position, the pressure of the safety valve 2 is released and the pilot valve 4 is closed, but the flow rate adjusting valve 3 is in the fully open state and the burner is maintained in the high-fire state. After that, when the weak button 108 is pressed, the rod 5 moves backward from the intermediate position and the flow rate adjusting valve 3 throttles the gas amount, and when the strong button 107 is pressed, the rod 5 advances toward the intermediate position and the gas amount decreases. Therefore, the fire power can be adjusted by pushing the buttons 107 and 108. When the fire extinguisher button 106 is pressed again, the rod 5 retracts to the retracted end position, the flow rate adjusting valve 3 is fully closed, and the burner is extinguished.

When temperature control is performed, the strong and weak buttons 107 and 108 are eliminated, and after ignition, the intermediate diameter portion 104c.
The operation shaft 102 may be rotated by the motor 101 in accordance with a signal from the temperature sensor within a range in which the cam portion between the minimum diameter portion 104a and the minimum diameter portion 104a contacts the rod 5. Further, when the ignition operation is performed, the operation shaft 102 is temporarily stopped at the ignition position. However, if the flame rod is used as the flame detection element and the safety valve 2 can be adsorbed and held at the same time as the ignition, the operation shaft 102 can be held. 102 to the intermediate diameter portion 104c
May rotate to the position where it contacts the rod 5 at the ignition position without being temporarily stopped.

FIG. 8 shows another embodiment in which the operating shaft 6 is manually operated. In FIG. 8, the same members as those in the embodiment of FIG. 1 are designated by the same reference numerals as above. In the structure shown in FIG. 8, a swingable operation lever 200 is provided, and a crank arm 201 engaged with the operation shaft 6 to prevent rotation is engaged with a long hole 200a formed in the operation lever 200 via a pin 201a. By swinging the operating lever 200, the operating shaft 6 is normally and reversely rotated between a fire extinguishing position and an ignition position. Further, in this structure, a bracket 202 extending forward along the valve casing 1 is integrally formed on the base plate 10a of the shaft guide 10, and the operation lever 200 is rotatably supported on the bracket 202 by a shaft 203. An operation unit including the mechanism 7, the shaft guide 10 and the operation lever 200 is configured. Further, in this structure, a pair of stopper portions 204 (only one of which is shown in FIG. 8) is formed on the bracket 202, and the swing range of the operating lever 200 corresponds to the fire extinguishing position and the ignition position of the operating shaft 6. Regulated to the extent.

FIG. 9 shows still another embodiment, in which the same members as those in FIG. 1 are designated by the same reference numerals. 9 includes a push button 300 and an operation ring 301 that can be rotated, and can perform ignition by pressing the push button 300 and adjustment of heat power by rotating the operation ring 301. Is configured.

To explain this in detail, a tubular case 302 is attached to the rear end of the valve casing 1, and the case 302 is attached.
A cylindrical rotating member 303 is housed therein, a push member 304 connected to the push button 300 is slidably inserted into the rotating member 303, and an operation ring 301 is provided at the rear end of the rotating member 303. A pin 303a that engages with is projectingly provided so that the rotating member 303 can be rotated integrally with the operation ring 301. Further, in the rear chamber 1e of the valve casing 1, a cylindrical cam 30 having a spiral cam groove 305a formed in a peripheral wall portion thereof.
5 is fitted and fixed, a cylindrical follower 306 having a projection 306a that engages with the cam groove 305a is inserted into the cam 305, and a slider 307 that contacts the rod 5 is inserted into the follower 306. I am inserting it.

The follower 306 is provided with a projection 306b which engages with an engaging groove 303b in the front-rear direction formed on the inner circumference of the front portion of the rotating member 303, and is slidably engaged with the rotating member 303 in a detent manner. To be done. Further, the inner circumference of the follower 306 is formed in a stepped shape with the front portion having a large diameter.
A protrusion 307a that can come into contact with the step 306c on the inner periphery of the follower 306 is formed, and the slider 307 with respect to the follower 306 is formed.
The backward movement of the car can be regulated at a fixed position. A spring bearing 308 is attached to the rear end of the follower 306, and a spring 309 weaker than the return spring 5a is interposed between the pushing member 304 and the spring bearing 308 to move the pushing member 304 to the rear. Is urged to. The pushing member 304 is a slider 307.
And a cylindrical portion 304b that faces the spring bearing 308 with a stroke distance L between the forward end position and the intermediate position of the rod 5 facing the spring receiver 308.

Thus, when the push button 300 is pushed, the slider 30 is moved through the shaft portion 304a of the pushing member 304.
7 is pushed forward, the rod 5 advances to the forward end position,
The safety valve 2 is pressed and opened, and the pilot valve 4 is opened. At the same time, an ignition switch (not shown) is closed to ignite the burner. In addition, during the forward movement of the rod 5, the pushing member 30
The cylindrical portion 304b of No. 4 abuts on the spring bearing 308 so that the follower 3
06 is pushed forward, the follower 306 is guided by the cam groove 305a and rotates while moving forward, and the operation ring 301 is normally rotated from the fire extinguishing position to the high fire position via the rotating member 303. In this case, since the follower 306 moves forward after the slider 307 moves forward by the distance L, the protrusion 307a of the slider 307 moves away from the step 306c on the inner circumference of the follower 306 by the distance L.
When the rod 5 is retracted from the forward end position by a distance L by the urging force of the return spring 5a, the slider 30 is released when the push button 300 is released after ignition.
7 has a step 306c on the inner circumference of the follower 306.
And the backward movement of the rod 5 is regulated at the intermediate position. At this intermediate position, the pressure of the safety valve 2 is released and the pilot valve 4 is closed, but the flow rate adjusting valve 3 is in the fully open state, and the burner is maintained in the high-fire state. After that, when the operation ring 301 is reversed from the high heat position, the follower 306
Is reversely guided by the cam groove 305a and retreats, the slider 307 and the rod 5 retreat following this, and the flow control valve 3 throttles the gas amount. Thus, operation ring 3
When the operation ring 301 is reversed to the fire extinguishing position, the flow rate adjusting valve 3 is fully closed and the burner is extinguished.

Although the embodiment in which the present invention is applied to the gas valve device having the safety valve 2, the flow rate adjusting valve 3 and the pilot valve 4 has been described above, the present invention is similarly applied to the gas valve device in which the pilot valve 4 is omitted. Can be applied.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of the apparatus of the present invention.

2A is a vertical cross-sectional view showing a state when the operating shaft is normally rotated to an ignition position, and FIG. 2B is a vertical cross-sectional view showing a state when the operating shaft is free at the ignition position.

FIG. 3 is a perspective view of a disassembled state of a cam mechanism unit and a shaft unit.

4A is a sectional view taken along the line IV-IV of FIG. 1, and FIG. 4B is a sectional view corresponding to FIG. 4A at an ignition position.

FIG. 5 is a development view of a cam groove formed on the cam.

FIG. 6 is a view showing a guide groove formed in a second follower.

FIG. 7 is a longitudinal sectional view showing a second embodiment of the device of the present invention.

FIG. 8 is a longitudinal sectional view showing a third embodiment of the device of the present invention.

FIG. 9 is a vertical sectional view showing a fourth embodiment of the device of the present invention.

[Explanation of symbols]

1 Valve Casing 2 Safety Valve 3 Flow Control Valve 3b Valve Body 5 Rod 5a Return Spring 6 Operating Axis 7 Cam Mechanism 70 Cam 71 First Follower 71a Engaging Part 72 Second Follower 72a Guide Groove 72a ₁ Wide Part 72a ₂ Narrow Part 72a ₃ Step 8 First inner case 9 Second inner case

Claims (5)

[Claims] 1. A fire extinguishing position and an ignition position are provided by providing a front safety valve, a rear flow rate adjusting valve for increasing / decreasing an amount of gas supplied to a burner, and a rod movable back and forth in a valve casing elongated in the front-rear direction. The operating shaft that can be rotated forward and backward between the position and the cam mechanism that converts the rotation of the operating shaft into the forward and backward movement of the rod is provided, and the rod is moved forward from the fire extinguishing position to the ignition position by the forward end position of the rod. In the gas valve device in which the safety valve is pushed open by advancing against the return spring to the forward end position, the cam mechanism cuts off the input of the rotational force in the forward rotation direction to the operating shaft at the ignition position. Sometimes the rod is restrained at the forward end position and the rod is retracted by the return spring at the intermediate position, and the rod is retracted from the intermediate position to the retracted end position by reversing the operating shaft from the ignition position to the fire extinguishing position. Configure and flow rate The valve is composed of a needle valve, and the valve body of the needle valve is provided integrally with the rod, and the amount of gas supplied to the burner increases or decreases as the rod moves back and forth between the intermediate position and the retracted end position. A gas valve device characterized by the above. 2. The cam mechanism includes a cam fixed to a valve casing, a first follower engaged with an operating shaft so as to prevent back and forth movement, and an engaging portion provided on the first follower. A second follower that engages in a guide groove that is long in the direction of the first follower, and that rotates forward and backward with the forward and reverse rotation of the first follower.
The rod is moved back and forth in conjunction with the forward and backward movement of one follower of the two followers, and the other follower is guided forward and backward by the cam by its forward and reverse rotations. The guide groove is formed in a stepped shape having a wide portion and a narrow portion, and at the time of forward rotation of the operating shaft from the fire extinguishing position, the engaging portion of the first follower causes the wide portion and the narrow portion of the guide groove to move. Between the first follower and the second follower are prevented from retracting relative to the other follower, and the input of the rotational force to the operation shaft in the forward rotation direction is cut off, the engagement of the first follower is stopped. The joining portion moves to the narrow portion of the guide groove so that the one follower is retracted by the biasing force of the return spring with respect to the other follower, and this retract distance is the forward end position of the rod and the forward end position. Set the length of the narrow part of the guide groove in the front-rear direction so that it is equal to the distance from the intermediate position. Gas valve according to claim 1, symptoms. 3. The ratio of the moving distance of the other follower in the front-rear direction to the rotation angle of the operating shaft is determined by the position of the other follower at the fire extinguishing position of the operating shaft and from this position before and after the narrow portion of the guide groove. The gas valve device according to claim 2, wherein the cam is formed so as to be larger than the other range in a range between the position and the position apart from the front by a length substantially equal to the directional length. 4. A first inner case that can be inserted into and removed from the front inner periphery of the valve casing, and a second inner case that can be inserted into and removed from the rear inner periphery of the valve casing. The first inner case has a safety valve and a rod. 4. The cam mechanism unit is constructed by accommodating a component of the cam mechanism in the second inner case while constructing the valve unit by assembling the return spring. The described gas valve device. 5. A safety valve on the front side, a flow rate control valve on the rear side for increasing / decreasing the amount of gas supplied to the burner, and a rod that can be moved back and forth are provided in a valve casing that is long in the front-rear direction. In the gas valve device in which the safety valve is pushed open by advancing against the spring from the backward end position to the forward end position, the safety valve is pushed open and ignited, and then the rod is restrained at the forward end position. At the same time as unwinding, the rod retracting by the return spring is regulated at the intermediate position, and the operating mechanism is configured so that the rod is advanced and retracted between the intermediate position and the retracted end position by the subsequent thermal power adjustment operation, and the flow rate adjusting valve is set to the needle. A valve, the valve body of the needle valve is provided integrally with the rod, and the amount of gas supplied to the burner is increased / decreased as the rod moves back and forth between the intermediate position and the retracted end position. To do that Gas valve device characterized by.