JPH0743570Y2 - Shut-off valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) This invention is incorporated into a gas meter, for example, and is a shutoff valve for shutting off gas flow in the event of an earthquake, gas leak, or other emergency. Regarding the device.

(Prior Art) A seismic sensor for detecting an earthquake and a gas leak alarm for detecting a gas leak are known. In addition, we put into practical use a safety device that combines these seismic sensors and gas leak alarms with a shutoff valve device to activate the shutoff valve device when a seismic shock or gas leak occurs to shut off gas flow. Has been done.

FIG. 3 shows a conventional shut-off valve device, where 1 is a case of a gas meter and 2 is a gas inlet. Case 1
A casing 5 for partitioning the primary pressure chamber 3 and the secondary pressure chamber 4 is provided inside, and a partition wall 6 above the casing 5 is provided with a flow port 8 having a valve seat 7. The lower partition wall 9 of the casing 5 is provided with a self-holding solenoid 11 via a mounting plate 10.

The self-holding solenoid 11 is composed of a coil 13 surrounding the plunger 12, a yoke 14 provided on the outer periphery of the coil 13, and a magnet 15 having a core piece 15a provided at the bottom of the yoke 14. A valve body 16 facing the flow port 8 is attached to the tip of the plunger 12, and the valve body 16 is biased by a spring 17 toward the valve seat 7. When the coil 13 of the self-holding solenoid 11 is not energized, the plunger 15
The valve body 16 is separated from the valve seat 7 and is in a valve open state by being overcome by the magnet 15, and when the coil 13 is momentarily energized to apply a reverse magnetic field, the valve body 16 is restored by the restoring force of the spring 17. 16 is pressed against the valve seat 7 to maintain the valve closed state.

Further, the upper partition wall 6 of the casing 5 is provided with bosses 18, 18 protruding toward the secondary pressure chamber 4 side.
A support plate 19 is provided between them. A return shaft 21 biased upward by a spring 20 is provided on the support plate 19 so as to be vertically movable. The return shaft 21 has a lower end surface on the tip end surface of the plunger 12 and an upper end surface on the case 1. It opposes the return operation button 22 provided on the.

Therefore, when an abnormality detector such as a seismic shock absorber or a gas leak alarm detects the abnormality and applies a reverse magnetic field to the self-holding solenoid 11, the flow port 6 of the gas meter is closed by the valve body 16, and Distribution can be blocked. Also,
In order to return the valve body 16 from the valve seat 17 to the open state, the return operation button 22 is pushed in, the return shaft 21 is pushed down against the restoring force of the spring 20, and the plunger 12 is springed by the return shaft 21. The lower end face of the plunger 12 is adsorbed to the core piece 15a by pushing down against the restoring force of the valve 17, thereby holding the valve element 16 in the valve open state.

However, when the shutoff valve device of the gas meter is closed,
When the temperature change of the environment is large, the pressure in the secondary pressure chamber 4 becomes negative and the pressure difference with the primary pressure chamber 3 becomes large. The valve body 16 may have a differential pressure of about 1000 mmH ₂ O, and if the valve body 16 is to be returned in such a state, a large force corresponding to the differential pressure is required. Further, as the size of the gas meter becomes larger, the valve body 16 also becomes larger, and the pressure receiving area becomes larger. Therefore, there is a problem that the force required for the returning operation becomes even larger.

Therefore, in order to solve the above-mentioned problems, a shutoff valve device has been developed in which the gas in the primary pressure chamber 3 is leaked to the secondary pressure chamber 4 at the time of the return operation to eliminate the pressure difference and reduce the return operation force. Has been put to practical use.

In this shut-off valve device, as shown in FIG. 4, a leak passage 23 is provided in the central portion of a valve body 16 serving as a main valve, and a pilot valve seat 24 is provided at a peripheral portion of the leak passage 23. There is. A pilot case 25 projecting to the primary pressure chamber 3 side is provided on the outer circumference of the pilot valve seat 24. A through hole 25a is formed in the peripheral wall of the pilot case 25, and a penetrating hole through which the upper end of the plunger 12 penetrates at the bottom. A hole 26 is provided. At the upper end of the plunger 12, inside the pilot case 25, there is a pilot valve that can be brought into and out of contact with the pilot valve seat 24.
27 is provided so that it can move up and down. The pilot valve 27 is constantly urged by the spring 28 in the valve closing direction. A pin portion 29 facing the upper end of the plunger 12 and a flange portion 30 facing the valve body 16 are provided at the lower end of the return shaft 21.

Then, to electrically return the shutoff valve device, the coil
A magnetic field is applied to 13 to attract the plunger 12. Plunger
When 12 is sucked, the spring 28 is compressed, the pilot valve 27 separates from the pilot valve seat 24 and opens, and the gas in the primary pressure chamber 3 enters the secondary pressure chamber 4 through the leak passage 23. Leak. Subsequently, the spring 17 is compressed by the suction force of the plunger 12, and the valve element 16 is separated from the valve seat 7 and opens the valve. Further, in order to manually return the shutoff valve device, the pilot valve 27 is pushed down by the return shaft 21 to open the valve so that the gas in the primary pressure chamber 3 leaks to the secondary pressure chamber 4 through the leak passage 23. Meanwhile, the return shaft 21 compresses the spring 17 to push down the valve element 16 to open the valve.

(Problems to be Solved by the Invention) As described above, when the shut-off valve device is restored, the pilot valve is opened to reduce the differential pressure between the primary pressure and the secondary pressure, so that the restoring operation force is reduced. However, it is necessary to provide a pilot case on the main valve provided at the tip of the plunger, and a pilot valve seat and pilot valve inside this, which is structurally complicated and difficult to assemble.
The cost has increased.

The present invention was made in view of the above circumstances, and its purpose is to open the pilot valve to restore the differential pressure between the primary pressure and the secondary pressure when the shutoff valve device is returned. It is an object of the present invention to provide a shutoff valve device which can be made small in size to make the return operation force light, and structurally simple to improve the assembling workability.

[Structure of the Invention] (Means and Actions for Solving the Problem) In order to achieve the above-mentioned object, the present invention has a plunger having a main valve for disconnecting the primary pressure chamber and the secondary pressure chamber from each other. A leak passage communicating with the primary pressure chamber and having the other end communicating with the secondary pressure chamber is provided, a pilot valve seat is provided in the middle of the leak passage, and the pilot valve seat is biased in the valve closing direction. Is provided with a pin for opening the pilot valve before projecting from the tip end surface of the plunger and returning the main valve by the return shaft.

When the return shaft is pushed down, the pin is pushed down first and the pilot valve opens, the gas in the primary pressure chamber leaks to the secondary pressure chamber through the leak passage, the pressure difference becomes small, and then the return shaft The main valve is pushed down and the main valve opens.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, screw holes 31 are concentrically provided at the tip of the plunger 12 of the self-holding solenoid 11. A screw portion 33 provided on a cylindrical shaft 32 is screwed and fixed in the screw hole 31. The cylindrical shaft 32 is provided with a leak passage 35 composed of a vertical hole 33 and a horizontal hole 34, and the primary pressure chamber 3
And the secondary pressure chamber 4 are communicated with each other. A female screw 36 is engraved on the inner peripheral surface of the vertical hole 33, and a cylindrical body 37 is screwed into the female screw 36. At the lower end of the cylindrical body 37, a pilot valve seat 38
Is installed on the pilot valve seat 38.
39 is provided so that it can be moved freely. A pin 40 is fixed to the pilot valve 39. The pin 40 projects upward from the tip end surface of the plunger 12, and the pilot valve 39
Between the bottom surface of 39 and the bottom surface of the lateral hole 34, the pilot valve 39
A spring 41 for urging the valve is closed.
By pushing down the pin 40 against the restoring force of the spring 41, the pilot valve 39 is separated from the pilot valve seat 38 and the leak passage 35 is opened.

Further, a main valve 43 integrally formed with a disc-shaped base 42 of a rubber-like elastic body on the cylindrical shaft 32 provided in the plunger 12,
It is attached by fitting the base 42.
Further, a flange-shaped pressing portion 44 is provided at the lower end of the return shaft 21, and the central portion of the pressing portion 44 is the pilot valve 39.
The peripheral edge of the pin 40 is opposed to the base 42 of the main valve 43 at a distance. Then, when the return shaft 21 is pushed down, first, the central portion of the pressing portion 44 contacts the pin 40, compresses the spring 41 and pushes down the pilot valve 39, and then the pressing portion.
The peripheral edge of 44 abuts the base 42, compresses the spring 17, and pushes down the main valve 43.

In the shut-off valve device configured as described above, the plunger 12 overcomes the spring 17 and is attracted by the attracting force of the magnet 15 when the coil 13 of the self-holding solenoid 11 is in the non-energized state, and the plunger 12 retracts and the main valve 43 Is kept open, but when the coil 13 is momentarily energized and a reverse magnetic field is applied, the restoring force of the spring 17 causes the plunger 12 to move forward and the main valve 43 to come into contact with the valve seat 7 and close. It is designed to hold this state.

To return the main valve 43 to the open state, the return shaft 21 is pushed down. At this time, first, the central portion of the pressing portion 44 contacts the pin 40, compresses the spring 41, and pushes down the pilot valve 39. When the pilot valve 39 opens, the leak passage
35 is opened and the gas in the primary pressure chamber 3 leaks to the secondary pressure chamber 4 through the leak passage 35, so that the pressure difference between the two chambers is reduced. When the return shaft 21 is further pushed down, the peripheral portion of the pressing portion 44 contacts the base 42, compresses the spring 17 and presses the main valve.
43 is pushed down. Therefore, the main valve 43 separates from the valve seat 7 and returns to the open state. In this way, after reducing the differential pressure between the primary pressure and the secondary pressure by the pilot valve 39,
By opening the main valve 43, the return operation force is reduced and the operability is improved.

Further, when assembling the shutoff valve device, the pilot valve 39 can be assembled by a simple attachment work of screwing the cylindrical shaft 32 into the screw hole 31 provided at the tip end portion of the plunger 12, and the assembling work can be performed easily, Plunger
A cylindrical shaft 32 may be provided at one end of 12 and the pilot valve 39 may be inserted into this cylindrical shaft 32 for assembly.

Further, by incorporating the pilot valve 39 into the plunger 12 of the main valve 43, the weight of the main valve 43 can be reduced.
Therefore, even if the shutoff valve device is installed sideways, the main valve 43
Does not cause misalignment, and there is no restriction on the assembly of the shutoff valve device.

[Effect of the Invention] As described above, according to the present invention, the primary pressure chamber and the
A plunger having a main valve for shutting off the secondary pressure chamber is provided with a leak passage communicating with the primary pressure chamber and the secondary pressure chamber, and a pilot valve is provided in the middle of the leak passage, so that the weight of the main valve is reduced. In addition, the main valve is not misaligned even if the shutoff valve device is installed sideways, and there is no restriction on the assembly of the shutoff valve device. Further, there is an effect that it is structurally simple, the assembling workability can be improved, and it can be provided at a low price.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a shutoff valve device showing an embodiment of the present invention, and FIG. 2 is a vertical sectional side view showing an enlarged main part of the same.
FIG. 3 and FIG. 4 are vertical side views of a conventional shutoff valve device. 3 ... Primary pressure chamber, 4 ... Secondary pressure chamber, 7 ... Valve seat, 11 ...
Self-holding solenoid, 12 …… plunger, 17 …… spring, 21 …… return shaft, 35 …… leak passage, 38 …… pilot valve seat, 39 …… pilot valve, 40 …… pin, 43…
… Main valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Tatsuaki Katsuno 3-1-20 Akihara, Kashiwa-shi, Chiba (72) Creator Hidetoshi Yamada 4-1-2 Hiranomachi, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Shozo Fujisawa 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka, Osaka Gas Co., Ltd. (72) Inventor Hiroshi Okada 135-1, 72-1, Norikura, Midori-ku, Nagoya, Aichi Prefecture (72) Inventor Gen Onoda 1-3-2 Shimura, Itabashi-ku, Tokyo Inside the Kinmon Mfg. Co., Ltd. (72) Takehiko Tsuno 1-3-2 Shimura, Itabashi-ku, Tokyo Mt. Kinmon Mfg. Co., Ltd. (56) References Japanese Unexamined Patent Publication No. 55-57777 (JP, A) Actual No. 58-99573 (JP, U)

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A restoring force of the spring, comprising: a main valve which is movable toward and away from a valve seat for the main valve; a spring which biases the main valve in a valve closing direction; and a plunger which is connected to the main valve. Self-holding solenoid for holding the main valve in the open state against the pressure of the main valve, and the main valve in the closed state, which is provided facing the tip end surface of the plunger, is pressed against the biasing force of the spring to open the valve. A shut-off valve device configured to shut off the primary pressure chamber from the secondary pressure chamber, the shut-off valve device including a return shaft that returns the state to a state, and one end of the plunger communicates with the primary pressure chamber and the other end thereof serves as a secondary pressure chamber. A communicating leak passage is provided, a pilot valve seat is provided in the middle of this leak passage, and a pilot valve biased in the valve closing direction is provided on this pilot valve seat. Projecting, the return shaft drives the main valve Cut-off valve device which is characterized in that a pin for opening the pilot valve prior to ascribed.