JPH0452547Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used as a safety valve in which the valve body separates from the valve seat and discharges fluid from within the valve seat when the fluid pressure within the valve seat becomes greater than a predetermined maximum pressure. The present invention relates to a safety valve with an intake valve which performs an intake action within the valve seat when the fluid pressure becomes lower than a predetermined minimum pressure.

Conventional technology Conventionally, boilers, etc. are equipped with an on-off valve as well as a safety valve, and when the fluid pressure inside the boiler becomes greater than a predetermined maximum pressure, the valve body of the safety valve separates from the valve seat and the high-pressure fluid is released. is discharged to the outside of the boiler to adjust the fluid pressure inside the boiler.When stopping the operation of the boiler, the on-off valve is manually opened in advance, and the temperature of the fluid inside the boiler decreases, causing the inside of the boiler to cool down. Even if the pressure is about to be reduced, air is allowed to flow into the boiler through the on-off valve to prevent damage to the boiler.

Problems to be Solved by the Invention However, with the above structure, the boiler must be equipped with two valves, a safety valve and an on-off valve, which increases equipment costs and requires the on-off valve to be closed every time the boiler is shut down. This required manual operation, and there was a problem that this manual operation was complicated.

In order to solve the latter problem, some systems use a solenoid valve as the opening/closing valve, and operate the solenoid valve in conjunction with an operation to turn off the power supplied to the boiler.
The problem was that the solenoid valve itself was very expensive.

Therefore, it is conceivable to attach an on-off valve to the valve body of the safety valve. As such an on-off valve attached to a valve body, there is a so-called breathing valve. This breathing valve has a through hole formed in the lower end surface of the valve body, and a metal valve body for opening and closing the through hole, and the valve body is normally closed by the biasing force of a spring. On the other hand, when the fluid pressure in the valve seat is reduced, the metal valve body is pulled toward the valve seat by the reduced pressure against the biasing force of the spring, opening the through hole. This is what I did.

However, the above breathing valve has the following problems. In other words, the depressurized state is usually -0.03
~0.05Kg/ ^cm2 Under such pressure, it is difficult to sufficiently pull the metal valve body against the urging force of the spring, and the flow into the valve seat is difficult. The amount of air taken into the engine was also very small, and a major problem was that a sufficient amount of air could not be obtained.

Therefore, an object of the present invention is to provide a safety valve with an intake valve that can ensure a sufficient amount of intake air in order to solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention consists of a valve body of an intake valve made of an elastic material so that it can operate satisfactorily even in a slight reduced pressure state and obtain a sufficient amount of intake air. It was configured so that it can be done. That is, a valve seat, a valve body whose lower end surface contacts the valve seat upper end surface, and a valve element whose lower end surface contacts the valve seat contact portion with the valve seat upper end surface. A safety valve with an intake valve is provided with a through hole for intake in the intake portion of the lower end surface of the valve body, and an elastic valve body that closes the through hole so as to be openable and closable. The intake valve is configured such that the elastic valve body opens the through hole when fluid pressure within the valve seat falls below a predetermined minimum pressure.

In the above configuration, the elastic valve body is a rubber membrane, and if the fluid pressure in the valve seat is equal to or higher than a predetermined minimum pressure, the rubber membrane seals the through hole of the valve body by its elastic force. If the fluid pressure within the valve seat is lower than a predetermined minimum pressure, the rubber membrane may be bent against the elastic force to open the through hole.

Further, in the above configuration, the elastic valve body is a rubber ball, and if the fluid pressure in the valve seat is equal to or higher than a predetermined minimum pressure, the fluid pressure causes the rubber ball to move around the through hole of the valve body. While being pressed to seal the through hole, if the fluid pressure in the valve seat is lower than a predetermined minimum pressure, the rubber ball may be configured to disengage from around the through hole and open the through hole. can.

Effect of the device In the above structure, when the pressure of the fluid increases and exceeds a predetermined maximum pressure, the valve element rises against the biasing force of the biasing member and separates from the valve seat, causing the fluid to enter the valve seat. It is discharged through the gap between the valve seat and the valve body. At this time, the elastic valve body closes the through hole of the valve body. On the other hand, when the fluid pressure inside the valve seat decreases and becomes lower than a predetermined minimum pressure, for example in a depressurized state, this pressure drop causes the elastic valve body to actuate and open the through hole in the valve body, opening the through hole of the valve body outside the valve seat. Allow fluid to flow into the valve seat.

Effects of the Invention According to the above configuration, since the intake valve is provided in the valve body of the safety valve, there is no need to separately provide the safety valve and the intake valve, and equipment costs can be reduced. In addition, the valve body of the intake valve is made of an elastic material,
Since fluid can flow into the valve seat even in a slightly reduced pressure state, a sufficient amount of intake air can be secured within the valve seat at a predetermined time even with a simple structure.

Embodiments Below, embodiments of the present invention will be described in detail based on FIGS. 1 to 6.

As shown in FIG. 1, the safety valve with an intake valve according to the present embodiment has a metal valve seat 1 and a valve seat contact portion 3a on the lower end surface that come into contact with and separate from the upper end surface 1a of the valve seat 1, and the lower end surface Through hole 3c in the central intake part,...
3c, and a compression spring 4 as a biasing member that presses the lower end surface of the valve element 3 in a direction to bring the valve seat contact portion 3a into contact with the upper end surface 1a of the valve seat 1. , the through hole 3c of the valve body 3,...
..., 3c and a rubber membrane 5 as an elastic valve body for opening and closing.

The valve seat 1 has a through hole 1b in the center thereof through which fluid can flow, and the upper end surface 1a around the opening at the upper end of the through hole 1b serves as the valve seat surface.

The valve body 3 has a valve seat contact portion 3a on the outer circumference of the lower end surface that comes into contact with and separates from the upper end surface 1a of the valve seat 1, and a recess 3b in the upper part of the valve body 3 that extends from the upper surface toward the lower end surface. form. This valve body 3 is fitted into the casing 2 so that its upper part is movable in the axial direction, and the upper outer peripheral side surface 3d of the side surfaces of the valve body 3 is inside the cylindrical part 2c that protrudes downward from the casing 2. It is made to be able to slide against the circumferential surface 2a. Through holes 2g are formed at predetermined intervals in this cylindrical portion 2c.

The compression spring 4 is compressed between the outer periphery of the bottom of the recess 3b of the valve body 3 and a spring receiving plate 6 which is housed above the recess 3b and movable up and down in the casing 2. As shown in FIG. 2, three through holes 3c, .
and a small diameter fitting hole 3 in the center of the bottom.
form e. Further, the side surface of the valve body 3 is provided with a through hole 3k that communicates with each of the through holes 2g of the casing 2, and the concave portion 3b of the valve body 3 and the discharge port 2b of the casing 2 are connected through these through holes 2g and 3k.
are in communication.

The intake valve attached to the valve body 3 of the safety valve is roughly composed of the rubber membrane 5 and a support rod 9 that penetrates the central base of the rubber membrane 5 and supports the rubber membrane 5. With its elastic force, the through hole 3 contacts the inclined portion 3i of the lower end surface of the valve body 3.
c, ..., 3c are sealed. The support rod 9 penetrates the lower end surface of the valve body 3 through the fitting hole 3e,
It is fixed to the valve body 3 with nuts 10, 10, and the central portion of the rubber membrane 5 is supported on the lower end surface of the valve body 3.
As shown in FIG. 3, annular grooves 5a, 5a are formed in the portion of the rubber membrane 5 that comes into contact with and separates from the inclined portion 3i of the valve body 3, that is, the outer peripheral portion.
When the slanted portion 3i comes into close contact with the inclined portion 3i, it is possible to effectively prevent the two from becoming inseparably bonded due to heat or the like and becoming unable to be opened or closed. When the fluid pressure inside the valve seat 1 is slightly reduced, the outer peripheral part of the rubber membrane 5 separates from the inclined part 3i of the valve body 3 against the elastic force of the rubber membrane itself, and The hole 3c and the inside of the valve seat 1 are made to communicate with each other.

The casing 2 has a small diameter part 2f formed in its upper part, and the spring receiving plate 6 is disposed immediately below the small diameter part 2f, and the adjusting screw 8 is fitted into a through hole formed inside the small diameter part 2f. ·Hold.
An O-ring (not shown) is fitted to the lower outer circumferential surface of the adjustment screw 8 and to the portion fitted into the fitting hole to seal the inside of the casing 2. The lower end portion 8a of the adjustment screw 8 is formed into a substantially conical shape, and its tip abuts on the upper central recess 6a of the spring receiving plate 6. This adjustment screw 8 is positioned relative to the casing 2 in the desired adjustment position by means of a locking nut (not shown). Therefore, by loosening the locking nut and rotating the adjustment screw 8 and screwing it into the casing 2, the spring receiving plate 6 descends to increase the biasing force of the compression spring 4, while the adjustment screw 8 is rotated and screwed into the casing 2. When the spring receiving plate 6 is rotated in the opposite direction and raised in the direction of pulling it out from the casing 2, the spring receiving plate 6 rises and the biasing force of the compression spring 4 becomes smaller.

According to the above configuration, the urging force of the compression spring 4 is adjusted to balance the predetermined fluid pressure within the valve seat 1, that is, so that the valve body 3 contacts the valve seat 1 even at the set pressure. In this state, if the fluid pressure inside the valve seat 1 increases and exceeds the predetermined maximum pressure,
The valve body 3 rises against the urging force of the compression spring 4, and fluid flows from the through hole 1b of the valve seat 1 through the gap between the valve seat 1 and the valve body 3 to the discharge port 2b. At this time, the rubber membrane 5 seals the through hole 3c of the valve body 3 by its elastic force and prevents communication between the inside of the valve body recess and the inside of the valve seat. On the other hand, when the fluid pressure within the valve seat 1 decreases to less than a predetermined minimum pressure, for example, when the pressure is reduced, the outer peripheral portion of the rubber membrane 5 resists its elastic force and is pushed against the support rod 9 due to this pressure drop. The inside of the valve body recess and the inside of the valve seat communicate with each other.
Fluid flows into the through hole b of the valve seat 1 from the outlet 2b.
It flows through the through holes 2g, 3k, the valve body recess 3b, and the through holes 3c, . . . , 3c. If the outlet 2b is open to the atmosphere, the outlet 2b
Atmospheric air flows into the valve seat from g.

According to the above embodiment, since the valve body 3 of the safety valve is equipped with the intake valve composed of the rubber membrane 5, the support rod 9, etc., there is no need to separately provide the safety valve and the intake valve in a device such as a boiler. Equipment costs can be reduced. In addition, the valve body of the intake valve is made of an elastic material, that is, the rubber membrane 5, so that fluid can flow into the valve seat even in a state of slight depressurization. It is possible to secure a sufficient amount of intake air.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other ways. For example, instead of forming the groove 5a on the outer periphery of the rubber film 5, the upper end surface of the outer periphery of the rubber film 5 is made flat,
A concave groove may be formed in the inclined portion 3i of the valve body 3 to achieve the same effect. Alternatively, one end of the rubber membrane 5 may be fixed directly near the through hole of the valve body 3 with a bolt, and the other end may swing relative to the valve body 3 to open and close the through hole 3c. good.

Further, as shown in FIG. 4, the elastic valve body is not limited to the rubber membrane 5, but the rubber hollow sphere 1.
It may be composed of 4. That is, a cylindrical base 3f is provided at the center of the valve body 3 and protrudes upward in FIG.
g and a small-diameter cylindrical portion 3h having a through hole 3j having a diameter smaller than that of the rubber hollow sphere 14 are integrally formed to constitute an intake portion. The rubber hollow ball 14 is movably inserted into the space surrounded by the cylindrical base 3f and the inclined cylinder 3g. This rubber hollow ball 14 comes into close contact with the inner surface of the inclined cylinder 3g due to the fluid pressure in the valve seat 1, and prevents communication between the inside of the valve body recess or the casing and the inside of the valve seat. When the fluid pressure in the valve seat drops below a predetermined minimum pressure, the hollow ball 14 falls due to the tensile force accompanying the drop in fluid pressure or because the fluid pressure no longer acts on the hollow ball 14, and the small diameter cylindrical portion 3h, that is, the inside of the valve body recess or the inside of the casing, and the inside of the valve seat 1 are communicated with each other. A hollow ball retaining member 13 having a female threaded portion formed on the inner surface of the lower part of the cylindrical base 3f and a male threaded portion screwed into the female threaded portion on the outer peripheral surface is screwed into the lower part of the cylindrical base 3f. This retaining member 13 is for preventing the hollow ball 14 from falling from the inside of the valve body 3 to the valve seat 1 when the hollow ball 14 falls as the fluid pressure in the valve seat 1 decreases. As shown in FIG. 5, the retaining member 13 has four pieces on the outer periphery of its bottom surface extending in the circumferential direction and communicating with the inside of the valve seat 1 and the inside of the cylindrical base of the valve body 3. Through holes 13a,...
..., 13a, and a recess 13b for receiving the hollow ball 14 is formed at the center of the bottom surface.

On the other hand, a wire mesh 15 is placed on the tip of the small diameter cylindrical portion 3h of the valve body 3, and then a cap-shaped wire mesh mounting member 16 is screwed to attach the wire mesh 15 to the tip surface of the small diameter cylindrical portion 3h. It is held between the inner surface of the member 16 and the inner surface of the member 16. This mounting member 16 has a through hole 1 in its center that communicates with the through hole 3j of the small diameter cylindrical portion 3h.
Form 6a. The wire mesh 15 prevents the hollow sphere 14 from coming out upward from the through hole 3j of the small diameter cylindrical portion 3h, and also prevents dust etc. from coming out from the outlet 2b.
This is a member to prevent the valve from entering the valve seat.

In the figure, reference numeral 11 denotes an adjustment ring screwed onto the upper outer circumferential surface of the valve seat 1, and by rotating the adjustment ring 11 forward and backward with respect to the valve seat 1, the upper end surface of the adjustment ring 11 and By adjusting the gap 12 between the valve body 3 and the lower end surface, the dead-end pressure and lift can be arbitrarily adjusted. Further, reference numeral 17 denotes a nut that is screwed together with the adjustment screw 8, and by loosening this nut 17 and rotating the adjustment screw 8, the biasing force of the compression spring 4 can be adjusted. Further, a large number of recesses 3l extending along the axial direction and communicating with the discharge port 2b are formed on the outer peripheral side surface of the valve body 3, and the recess 3b of the valve body 3 and the discharge port 2b are connected via the recesses 3l. communicate.

According to this embodiment, a hollow sphere 1 is used as the elastic valve body.
4 is used, even if the fluid pressure inside the valve seat 1 is low, the through hole 3j of the small diameter cylindrical portion 3h can be sufficiently sealed to prevent communication between the inside of the valve body recess or the inside of the casing and the inside of the valve seat. I can do it. Also, hollow ball 1
Even if there is some unevenness on the inner surface of the inclined cylinder 3g with which the hollow sphere 14 comes into contact, the hollow sphere 14 can be easily elastically deformed, so that sufficient sealing performance can be obtained. Further, even if the fluid pressure on the valve seat side increases and the hollow ball 14 deforms and tries to escape from the valve body through the through hole 3j of the small diameter cylindrical portion 3h, the wire mesh 15 prevents the hollow ball 14 from coming out. This can be reliably prevented.

In addition, in FIG. 4, it is also possible to use a solid rubber ball instead of the hollow ball 14.

Further, in place of the hollow sphere 14 in FIG. 4, a rubber membrane 18 as shown in FIG. 6 may be used. That is, in FIG. 6, the rubber film 1
The tip end 19b of the support rod 19 made of metal or synthetic resin is fitted to the base of the rubber membrane 18 by integral molding or the like to prevent it from coming off, and the rubber membrane 18 is provided near the outer periphery of the upper end surface with the same effect as the groove 5a described above. An annular concave groove 18a is formed. This rubber film 18 contacts the curved inner surface of the inclined cylinder 3g of the valve body 3 and seals the through hole 3j of the small diameter cylindrical portion 3h. The lower end small diameter portion 19a of the support rod 19 is fitted into a sliding hole 20b of a guide member 20 screwed into the lower part of the valve body 3 so as to be freely slidable in the axial direction. The guide member 20
Through holes 20a, . . . , 20a are formed in the outer periphery of. Therefore, in this embodiment, if the fluid pressure on the valve seat side is equal to or higher than a predetermined minimum pressure, the rubber membrane 18 is caused by the pressure of the fluid that has entered the cylindrical base 3f from within the valve seat through the through hole 20a. , in the figure, the support rod 19 rises by being pressed upward, and the rubber membrane 18 comes into close contact with the inner surface of the inclined cylinder 3g of the valve body 3, preventing communication between the inside of the valve body recess or the casing and the inside of the valve seat. do. On the other hand, when the fluid pressure within the valve seat 1 decreases and becomes smaller than a predetermined minimum pressure, the rubber membrane 18 and the support rod 19 move downward relative to the valve body 3, opening the through hole 3j and causing the inside of the valve body recess to flow downward. Alternatively, the inside of the casing and the inside of the valve seat are communicated, and a sufficient intake action is performed.

As another modification, in FIG. 4, the upper end surface of the through hole 3j of the small diameter cylindrical portion 3h is completely closed, and the outlet 2b is provided on the side surface of the cylindrical base 3f.
A through hole may be formed which communicates with the through hole, and the through hole may be opened and closed by an elastic valve body such as the rubber membrane shown in FIG.

Further, in each of the above embodiments, the material of the elastic valve body is not limited to rubber, but any material such as synthetic resin can be used as long as it has a desired elasticity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a safety valve with an intake valve according to an embodiment of the present invention, and FIGS. 2 and 3 are a plan view and a rubber membrane showing one-third of the valve body of the safety valve shown in FIG. 1, respectively. FIG. 4 is a partial sectional view of a safety valve with an intake valve according to another embodiment; FIG. 5 is a quarter of the hollow ball retaining member of the safety valve shown in FIG. 4; FIG. 6 is a sectional view of a main part showing a modification of the elastic valve body in the safety valve of FIG. 4. 1...Valve seat, 1a...Top end surface, 1b...Through hole, 2...Casing, 2a...Inner peripheral side, 2b
...Discharge port, 2f...Small diameter part, 3...Valve body, 3a
...Valve seat contact portion, 3b...Concave portion, 3c...Through hole, 3d...Outer peripheral side, 3e...Small diameter fitting hole, 3
f... Cylindrical base, 3g... Inclined cylinder, 3h... Small diameter cylindrical part, 3i... Inclined part, 3j... Through hole, 4...
... Compression spring, 6 ... Spring receiving plate, 8 ... Adjustment screw, 10 ... Nut, 11 ... Adjustment ring, 12
...Gap, 13...Hollow ball retaining member, 13a...
...Through hole, 14...Rubber hollow ball, 15...Wire mesh, 16...Mounting member, 16a...Through hole, 17
... Nut, 18 ... Rubber membrane, 19 ... Support rod,
20...Fixing member, 20a...Through hole.

Claims (1)

[Claims for Utility Model Registration] (1) A valve seat 1, a valve body 3 whose lower end face has a valve seat contact portion 3a that comes into contact with and separates from the upper end face 1a of the valve seat 1, and a valve body 3 whose lower end face is A safety valve with an intake valve is provided with a biasing member 4 that presses the valve seat contact portion 3a in a direction to bring it into contact with the upper end surface 1a of the valve seat 1, and the intake portion of the lower end surface of the valve body 3 is provided with an intake valve. The through holes 3c, 3j are provided, and the through holes 3c,
Elastic valve body 5, 14, which opens and closes 3j.
18 to constitute an intake valve, and when the fluid pressure in the valve seat falls below a predetermined minimum pressure, the elastic valve bodies 5, 14, 18 open the through holes 3c, 3j. A safety valve with an intake valve. (2) The elastic valve bodies 5, 14, 18 are rubber membranes 5, 1
8, and if the fluid pressure in the valve seat is equal to or higher than a predetermined minimum pressure, the rubber membranes 5, 18 seal the through holes 3c, 3j of the valve body 3 by their elastic force, while the valve seat If the fluid pressure inside is lower than a predetermined minimum pressure, the rubber membranes 5, 18 are bent against the elastic force, and the through holes 3c, 18 are bent.
3j is opened. The safety valve with an intake valve according to claim 1 of the utility model registration claim. (3) The elastic valve bodies 5, 14, 18 are rubber balls 14, and if the fluid pressure in the valve seat is equal to or higher than a predetermined minimum pressure, the fluid pressure causes the rubber balls to
4 is pressed around the through-hole of the valve body 3 to seal the through-holes 3c and 3j, while the fluid pressure within the valve seat is lower than a predetermined minimum pressure,
The rubber ball 14 comes off from around the through hole,
The safety valve with an intake valve according to claim 1, wherein the through holes 3c and 3j are opened.