JPH09280386A - Shut-off valve with pilot mechanism - Google Patents

Abstract

(57) Abstract: In a battery-operated shutoff valve with a pilot mechanism, it is an object to reduce the operating energy in order to extend the life of the battery. SOLUTION: The position of an auxiliary valve seat 32a provided in the main valve body 32 as a pilot mechanism is eccentric from the center, and the force F required for the plunger 3 to open the auxiliary valve is reduced by leverage. A sub valve body arm 39 used as a lever also serves as a sub valve body, and the arm 39 has an arm mounting hole 38 provided near the end of the main valve body retainer 38 held by the main valve body 32.
It is rotatably attached to c with a mounting pin 39a, and the other end is urged by an auxiliary spring 36 arranged between it and a hook portion 38b provided near the other end of the main valve body retainer 38, and the intermediate portion is It is connected to the slide pin of the plunger 3. If the sub valve body arm 39 is a leaf spring, the sub spring 36 can be omitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off valve with a pilot mechanism which is built in a gas meter or the like and shuts off (closes) or restores (opens) a flow path of gas or the like in response to a signal from an electronic circuit. .

[0002]

2. Description of the Related Art A conventional gas cutoff valve with a pilot function is disclosed, for example, in Japanese Patent Laid-Open No. 6-323462 and Japanese Patent Publication No.
The one disclosed in Japanese Patent No. 18488 is typical. Generally, in the shut-off state of the shut-off valve in actual use, there is a gas pressure difference between the upstream side and the downstream side of the valve. For this reason, a large amount of energy is required to directly open the main valve having a large pressure receiving area. Therefore, a pilot mechanism is provided to reduce this energy. Specifically, the valve is configured with two valves, a main valve and an auxiliary valve. First, the auxiliary valve with a small pressure receiving area is opened to reduce the upstream / downstream pressure difference, and the main valve receives from the upstream side. The pressure is reduced, the energy required is reduced and the main valve is opened. In this way, it is possible to open the valve with much less energy than directly opening the main valve.

The above-mentioned two conventional techniques will be described in more detail with reference to the drawings. FIG. 5 shows JP-A-6-32346.
FIG. 3 is a cross-sectional view of the gas cutoff valve shown in Japanese Patent Publication No. A main valve seat 13 is provided at the right end of the main passage 4 on the downstream side, and a main valve body 12 that opens and closes the main valve seat 13 constitutes a main valve.
The main valve body 12 is biased by a main spring 15 against a main valve seat 13. A sub-valve seat 12a and a sub-passage 14 are provided in the center of the main valve body 12, and the sub-valve 11 provided at the tip of the plunger 3 constitutes a sub-valve. A support pin 8 for holding a spring receiver 9 is arranged at the center of the tip of the sub valve body 11 so as to penetrate through the sub passage 14. An auxiliary spring 16 is arranged between the spring receiver 9 and the main valve body 12. The plunger 3 is slidably arranged in the center of the electromagnet 1 of the drive unit, and
The plunger 3 is moved to the left and right to open and close the valve by controlling the electric current to the valve.

The operation of the pilot mechanism will be described in more detail. FIG. 5 shows a state in which only the sub valve is opened at the initial stage of valve opening. The plunger 3 is moved to the right by the electromagnet 1, the sub-valve 11 is separated from the sub-valve seat 12a, and the gas flows through the sub-passage 14 to the downstream side as indicated by the dotted line. However, in the main valve body 12, the combined force of the force to the right due to the pressure difference between upstream and downstream and the biasing force to the right by the main spring 15 is greater than the force to the left by the auxiliary spring 16, It is pressed against the main valve seat 13 side. When the pressure difference between upstream and downstream is reduced by the inflow of gas from the sub passage 14 and the force relationship is reversed, the main valve body 12 leaves the main valve seat 13 and moves to the right, and the main valve opens, The valve opening operation is completed.

When closing the valve, the main valve and the sub valve are closed by moving the plunger 3 to the left side, and further,
The main valve body 12 and the sub-valve body 11 are pressed against their respective valve seats by the pressure difference between the upstream side and the downstream side, and the state is maintained. In this type of shut-off valve, a support pin 8 for holding a spring receiver 9 penetrates through the center of the sub passage 14, and the pressure receiving area of the sub valve body 11 is larger than that of the sub passage 14 compared with the area of the sub passage 14. It is enlarged by the amount corresponding to the cross-sectional area. Therefore, due to the pressure difference between the upstream and downstream, the force applied to the sub-valve body 11 increases correspondingly, and the energy required to open the sub-valve increases accordingly. Further, since the shape of the sub passage 14 is complicated, the fluid resistance becomes larger than that of a simple shape having the same cross-sectional area, and the area needs to be increased by that amount, which is necessary for opening the sub valve. Increases energy. This is a drawback of this type of shut-off valve.

[0006] Next, referring to FIG.
The shutoff valve shown in Japanese Patent No. 8 will be described. This shut-off valve eliminates the above-mentioned drawbacks of the shut-off valve of the type of FIG. The structure is such that a sub valve seat 22a is provided at the center of the main valve body 22, and the sub valve body 21 is attached to the sub valve body and the sub spring holding portion 3a provided at the tip of the plunger 3, and the sub valve body 21 The sub spring 26 biases the sub valve body 21 to the sub valve seat 22a between the sub valve body mounting member 27 mounted on the main valve body 22 so as to surround the sub valve body and the sub spring holding portion 3a. Is attached to.

In this structure, there is no support pin as shown in FIG. 5 in the sub passage 24 of the sub valve seat 22a and the shape is simple. The force exerted on the body due to the pressure difference between upstream and downstream is significantly smaller than that in the case of FIG.

[0008]

However, when the pressure on the upstream side is much higher than the pressure on the downstream side, there is still a problem that the energy for operating the sub-valve becomes large, and the gas meter has a problem. When used as a built-in device, it is required to further reduce the operating energy in order to extend the life of the battery.

Therefore, an object of the present invention is to provide a shut-off valve with a pilot mechanism that operates with a smaller amount of energy than the prior art.

[0010]

In order to solve the above-mentioned problems, in the present invention, (1) the auxiliary valve seat is arranged at a position eccentric from the center of the main valve body, and (2) the opening and closing of the auxiliary valve. Uses a lever that has a sub-valve as part of it. By utilizing the leverage, the force required to move the plunger is reduced and the energy required is reduced.

In the first and second aspects, the arm-shaped lever is used, and in the third and fourth aspects, the leaf spring is used. When using leaf springs as a lever,
It can also serve as an auxiliary spring for urging the auxiliary valve element toward the auxiliary valve seat. Further, in claims 2 and 4, the main valve body is formed of an elastic body such as rubber, and the main valve body retainer including the insertion hole through which the sub valve seat is inserted and the fulcrum of the lever and the holding portion is made more rigid. The main valve retainer is held by the main valve body by abutting against the main valve body on the back surface of the main valve body retainer with the auxiliary valve seat inserted through the insertion hole.

With this structure, since the portion of the main valve body that contacts the main valve seat and the sub valve seat can be elastically deformed, the main valve seat and the sub valve body can be made of highly rigid material, and the number of parts can be reduced. it can.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As described in the section [Means for Solving the Problems] of the present invention, (1) the auxiliary valve seat is arranged at a position eccentric from the center of the main valve body, and (2) ) The opening and closing of the sub-valve is characterized by using a lever provided with a part of the sub-valve.

A more detailed description will be given below with reference to embodiments.

[0015]

[First Embodiment] FIG. 1 is a sectional view of the essential parts of the first embodiment.
2 shows an exploded perspective view thereof. This embodiment corresponds to claim 2. The main valve body 32 made of an elastic material such as rubber is provided with a sub valve seat 32a at a position eccentric from the center. A main valve body retainer 38, which is a resin molded product, is attached in contact with the upstream surface of the main valve body 32. The main valve retainer 38 has an auxiliary valve seat insertion hole 38a through which the auxiliary valve seat 32a is inserted.
An arm mounting hole 38c, which serves as a fulcrum of a sub valve body arm 39, which will be described later, is fitted to the outside of the arm mounting hole 38c, and a hook 38b for mounting the sub spring 36 on the opposite side of the fulcrum.
And The sub-valve body arm 39 of the resin molded product has a function as a sub-valve body in a portion where it comes into contact with the sub-valve seat 32a, which includes a mounting pin 39a for mounting on the fulcrum portion, and a plunger 3. Is provided with a slide groove 39b for levering the sub-valve body arm 39 in a linked manner. By fitting the mounting pin 39a and the arm mounting hole 38c of the main valve body retainer 38, the main valve retainer 38 and the sub valve body arm 39 are integrated. Further, the sub spring 36 is mounted between the hook portion 38b of the main valve body retainer 38 and the sub valve body arm 39, and always urges the sub valve body arm 39 toward the sub valve seat 32a. The plunger 3 is made of a magnetic material and has a slide pin 3b at its tip, and the slide pin 3b is engaged with the slide groove 39b of the sub valve body arm 39 so as to be interlocked.

In the pilot mechanism having the above structure, the plunger 3 is inserted into an electromagnet (not shown), and when a current is passed through the electromagnet, the plunger 3 moves to open / close the valve. The operation relationship between the sub-valve and the main valve is the same as that described in the prior art, and therefore will be omitted. In this case, the minimum force F required for the plunger 3 to open the auxiliary valve is the auxiliary valve seat.
P is the force pushing the 32a, and the auxiliary valve seat 32 from the mounting pin 39a.
Distance to a is L2, mounting pin 39a to slide groove 39b
If the distance to is L1, then:

[0017]

[Formula 1] F = P (L2 / L1) Here, since L1> L2, F <P, and the plunger 3 is compared with the case of the conventional technique (F = P) shown in FIG. It requires less energy to operate.

In this embodiment, the slide pin 3b provided at the tip of the plunger 3 is used as a means for connecting the plunger and the lever so as to be interlocked with each other.
Although it is engaged with 39b so as to be interlocked, a flexible pin or the like is provided at the tip of the plunger 3, and the auxiliary valve arm is provided at the tip thereof.
It is also possible to combine with 39.

[0019]

[Second Embodiment] In the first embodiment, the main valve body 32 made of an elastic body and the main valve body retainer 38 made of a resin molded product are made into an integral resin molded product, and the valve body of the valve and the valve seat are brought into contact with each other. A structure in which an elastic body such as rubber is fitted to the portion (a structure close to that in FIG. 6) and a sub-valve body arm is adopted corresponds to claim 1. In this case, an elastic body such as rubber is required at the contact portion between the valve body of each of the main valve and the auxiliary valve and the valve seat. The energy reduction effect of the lever is exactly the same as that of the first embodiment.

[0020]

[Third Embodiment] FIG. 3 is a sectional view of an essential part of the third embodiment.
4 shows an exploded perspective view thereof. This embodiment corresponds to claim 4. The main valve body 32 made of an elastic material such as rubber is provided with a sub valve seat 32a at a position eccentric from the center. A resin-molded main valve body retainer 48 is attached in contact with the upstream surface of the main valve body 32. The main valve retainer 48 has a sub-valve seat insertion hole 48a through which the sub-valve seat 32a is inserted.
And a leaf spring mounting portion 48 for mounting a sub valve leaf spring 49 described later.
b and. The sub-valve leaf spring 49 has the sub-valve seat 32.
The part that abuts on a has a function as a sub-valve body, and is provided with a mounting hole 49b for mounting on the main valve body retainer 48 and a central hole 49a for coupling with the plunger 3. . The main valve retainer is held in the mounting hole 49b.
By fitting the leaf spring mounting portion 48b of 48, the main valve body retainer 48 and the sub valve body leaf spring 49 are integrated. The plunger 3 is made of a magnetic material and has a sub-valve leaf spring at its tip.
The stop pin 3c passed through the central hole 49a of the valve 49 is coupled to the auxiliary valve plate spring 49 and the plunger 3 to be integrated.

In this case, the minimum force F required for the plunger 3 to open the sub-valve is P which is the force pushing the sub-valve seat 32a, from the position corresponding to the fulcrum of the sub-valve leaf spring 49 to the sub-valve seat 32a. Is L2, and the distance from the fulcrum-equivalent position of the sub-valve leaf spring 49 to the central hole 49a is L1, the same relationship as in [Equation 1] is established, and the energy for operating the plunger 3 can be small. It will be.

In this embodiment, since the sub-valve leaf spring 49 also functions as the sub-spring in the first embodiment, the number of parts is reduced.

[0023]

[Fourth Embodiment] In the third embodiment, the main valve body 32 made of an elastic body and the main valve body retainer 48 made of a resin molded product are made into an integral resin molded product, and the valve body of the valve and the valve seat are brought into contact with each other. Structure in which an elastic body such as rubber is fitted or attached to the part (structure close to Fig. 6)
And a structure in which a sub-valve leaf spring is adopted is defined in claim 3.
Is equivalent to In this case, an elastic body such as rubber is required at the contact portion between the valve body of each of the main valve and the auxiliary valve and the valve seat. The energy reduction effect of the lever is exactly the same as that of the third embodiment.

In the above embodiments, the main valve body pressing member and the sub valve body arm have been described as resin molded products, but another material having the required rigidity, such as metal, can be used and the processing method can be used. However, the method is not limited to the molding method as long as it can be processed into a similar shape, such as machining.

[0025]

According to the present invention, the sub-valve seat is arranged at a position eccentric from the center of the main valve body, and a lever provided with a sub-valve body is used to open and close the sub-valve. Therefore, the energy required to open the sub-valve becomes small, and the valve opening operation can be performed reliably even when the gas pressure is high. Also,
The operating energy can be reduced, and the life of the battery when it is driven by a battery can be extended. Further, by using the main valve retainer and the sub-valve leaf spring, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a first embodiment of a pilot mechanism according to the present invention.

FIG. 2 is an exploded perspective view showing the structure of the first embodiment.

FIG. 3 is a sectional view showing the structure of a third embodiment of the pilot mechanism according to the present invention.

FIG. 4 is an exploded perspective view showing the structure of the third embodiment.

FIG. 5 is a sectional view showing the structure of a shut-off valve with a pilot mechanism according to the prior art.

FIG. 6 is a sectional view showing the structure of another pilot mechanism according to the prior art.

[Explanation of symbols]

 1: Electromagnet 4: Main passage 8: Support pin 9: Spring receiver 3: Plunger 3a: Sub valve body and sub spring holding part 3b: Slide pin 3c: Stop pin 11, 21: Sub valve body 12, 22, 32: Main Disc 22a, 32a: Sub valve seat 13, 23, 33: Main valve seat 14, 24, 34: Sub passage 15: Main spring 16, 26, 36: Sub spring 27: Sub valve mounting member 27a: Opening 38 , 48: Main valve retainer 38a, 48a: Sub toilet seat insertion hole 38b: Hook part 38c: Arm mounting hole 39: Sub valve arm 39a: Mounting pin 39b: Slide groove 48b: Leaf spring mount 49: Sub valve plate Spring 49a: Central hole 49b: Mounting hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F16K 31/06 385 0380-3K F16K 31/06 385F (72) Inventor Kenichi Sato Kawasaki City, Kanagawa Prefecture 1-1 Tanabe Nitta, Kawasaki-ku, Fuji Electric Co., Ltd.

Claims (4)

[Claims] 1. A valve comprising a main valve and a sub valve, a main valve body having a sub valve seat having a smaller pressure receiving area than the main valve seat, and a sub valve body for opening and closing the sub valve seat is connected to a plunger. , In a shut-off valve with a pilot mechanism equipped with a sub spring for urging the sub valve body to the sub valve seat, the sub valve seat is arranged at a position eccentric from the center of the main valve body, and the sub valve is moved by the movement of the plunger. A lever provided with a sub-valve for opening and closing the seat, a means for coupling the plunger and the lever so that they can interlock, and a fulcrum for pivotally coupling the lever outside the sub-valve of the main valve. A shutoff valve with a pilot mechanism, comprising: a main valve body and a sub spring between the lever and the sub valve for urging the lever to the sub valve seat. 2. A valve comprising a main valve and a sub valve, the main valve body having a sub valve seat having a smaller pressure receiving area than the main valve seat, and the sub valve body for opening and closing the sub valve seat is connected to a plunger. , In a shut-off valve with a pilot mechanism equipped with a sub spring for urging the sub valve body to the sub valve seat, the main valve body is made of an elastic body, and the sub valve seat is placed at a position eccentric from the center of the main valve body. It is equipped with a lever that has a sub-valve that opens and closes the sub-valve seat by moving the plunger.The insertion hole through which the sub-valve seat is inserted and the lever that is provided outside the insertion hole are rotatable. The main valve body retainer, which includes a fulcrum to be joined and a sub spring mounting portion that mounts a sub spring that urges the lever to the sub valve seat, has a main valve body on the back surface with the sub valve seat inserted in the insertion hole. It is held by the main valve body in contact with the lever, and the lever is rotatably connected to the fulcrum of the lever. The lock with the pilot mechanism is characterized in that the locker and the lever are connected by a connecting means that can be interlocked, and the auxiliary spring is provided between the auxiliary spring mounting part and the vicinity of the end of the lever on the opposite side of the fulcrum. valve. 3. A valve is composed of a main valve and a sub valve, the main valve body is provided with a sub valve seat having a smaller pressure receiving area than the main valve seat, and the sub valve body for opening and closing the sub valve seat is connected to the plunger. In a shutoff valve with a pilot mechanism, the sub-valve seat is located eccentrically from the center of the main valve body, and the sub-valve consists of a leaf spring that has a sub-valve body that opens and closes the sub-valve seat by moving the plunger. It is equipped with a valve body leaf spring, the plunger and the subsidiary valve body leaf spring are connected near the center of the subsidiary valve body leaf spring, and one end of the subsidiary valve body leaf spring is attached to the main valve body. Shut-off valve with pilot mechanism. 4. The valve comprises a main valve and a sub valve, the main valve body is provided with a sub valve seat having a smaller pressure receiving area than the main valve seat, and the sub valve body for opening and closing the sub valve seat is connected to the plunger. In a shutoff valve with a pilot mechanism, the main valve body is made of an elastic body, the sub-valve seat is located at a position eccentric from the center of the main valve body, and the sub-valve body that opens and closes the sub-valve seat by moving the plunger It is equipped with a sub-valve leaf spring consisting of a leaf spring that has a part of it, and the main valve body retainer equipped with a through hole through which the sub-valve seat is inserted and a leaf spring mounting part for mounting one end of the sub-valve leaf spring. With the sub valve seat inserted through the insertion hole, the back surface of the sub valve seat abuts against the main valve body and is held by the main valve body.The plunger and the sub valve body leaf spring are connected near the center of the sub valve body leaf spring. And one end of the sub-valve leaf spring is attached to the leaf spring mounting portion of the main valve retainer. Pilot mechanism with a shut-off valve.