JP2575591Y2 - Shut-off valve - Google Patents

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 which is incorporated in, for example, a gas meter and shuts off gas flow in the event of an earthquake, gas leak, or other emergency.

[0002]

2. Description of the Related Art A seismic sensor for detecting an earthquake and a gas leak alarm for detecting a gas leak are known. In addition, a safety device that combines these seismic devices and gas leak alarms with a shut-off valve device and activates the shut-off valve device in the event of a shock or when a gas leak occurs to cut off the gas flow has also been put into practical use. Have been.

FIG. 3 shows a shut-off valve that is incorporated in a gas meter or the like and shuts off the gas flow in the event of an earthquake, gas leak, or other emergency. Numeral 11 denotes a self-holding type solenoid.
2 and a bobbin 13 having a pipe 13a as a fitting portion
b, a coil 13 wound around the bobbin 13b, and a magnet 15 having a yoke 14 provided on the outer periphery of the coil 13 and a core piece 15a provided at the bottom of the yoke 14.

A valve body 16 is attached to the tip of the plunger 12 so as to face a communication port 10c for communicating the primary side 10a and the secondary side 10b of the gas flow passage 10.
6 is urged by a spring 17 toward the valve seat 20. The coil 13 of the self-holding solenoid 11
In a non-energized state, the plunger 12 overcomes the spring 17 and is attracted to the core piece 15a.
Although the valve is open from a distance from 0, when the coil 13 is momentarily energized and a reverse magnetic field is applied, the valve 16 is pressed against the valve seat 20 by the restoring force of the spring 17 to maintain the valve closed state. It has become.

Therefore, an abnormality detector such as a seismic sensor or a gas leak alarm senses the abnormality and detects the abnormality.
By applying a reverse magnetic field to the communication port 1 of the gas meter
0c can be closed by the valve element 16 to shut off the gas flow.

In order to separate the valve body 16 from the valve seat 20 and return to the valve-open state, the valve body 16 is indirectly pushed by a return mechanism (not shown) such as a return operation button, and the plunger 12 is spring-loaded. 17 is pressed down against the restoring force of the plunger 12 so that the lower end face of the plunger 12 is
The valve body 16 is maintained in the valve-open state by being adsorbed on the valve body 16.

[0007]

However, the shut-off valve configured as described above is different from the pipe 13a of the bobbin 13b.
The plunger 12 is slidably fitted in the axial direction, and the opening of the pipe 13 a is open to the gas flow passage 10.

Accordingly, even if dust and dew water enter between the inner surface of the pipe 13a and the outer peripheral surface of the plunger 12, the sliding resistance of the plunger 12 increases, and even if a shut-off signal is input to the self-holding type solenoid 11, it operates. There is a risk of failure. Further, if foreign matter such as dust entering the pipe 13a is adsorbed on the core piece 15a, there is a possibility that poor adsorption may occur even when the plunger 12 is adsorbed and held in the valve open state. Furthermore, when the dew water enters the pipe 13a, the plunger 12 and the core piece 15 are corroded, and the corrosion may cause the above-described malfunction.

Therefore, in order to solve the above-mentioned problem,
As shown in FIG. 4, a bellows-like dust cover 19 is provided between the middle part of the plunger 12 and the flange 18, and the opening of the pipe 13 a is closed by the dust cover 19, and dust and dew water enter together with the gas seal. A shut-off valve has been developed that has a structure that prevents this.

However, if the dust cover 19 is provided inside the spring 17 and so as to cover the plunger 12, the structure becomes complicated, the assembly is troublesome, and the cost increases.

The present invention has been made in view of the above-mentioned circumstances. The purpose of the invention is to prevent dust and dew condensation water from entering the bobbin pipe when the valve is in an open state. It is an object of the present invention to provide a shut-off valve which can prevent malfunction due to water and dew condensation, and can be structurally simple and reduce costs.

[0012]

Means and Action for Solving the Problems The present invention provides:
In order to achieve the above-mentioned object, a spring for urging a valve body in a valve closing direction, a plunger connected to the valve body, a bobbin having a fitting portion fitted to the plunger, and a coil provided on the bobbin And a self-holding solenoid that holds the valve body open against the restoring force of the spring, wherein the plunger is magnetically attracted to the magnet at the fitting portion of the bobbin. When the valve body is in the open state, a seal is provided to contact the back of the valve body to block the bobbin fitting part from the outside, and dust and dew condensation water enter the bobbin fitting part. Has been prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a first embodiment, in which a tip of a pipe 21 as a fitting portion of a bobbin 13b projects from a flange 22 of a self-holding solenoid 11, and an outer peripheral surface of the tip is formed. Has an edge portion 21a as a seal portion formed by a tapered taper.

A valve body 23 is provided at the tip of the plunger 12 inserted into the pipe 21 through a washer 23a.
It is fixed by a retaining ring 23b. The valve body 23 has a disk-shaped valve body 24 made of rubber and a plate 25 made of a metal plate joined to the back surface of the valve body 24.
It is composed of

A convex portion 24a is formed at the center of the back surface of the valve body 24, and an annular groove 24b is provided at the outer peripheral portion on the distal end side of the convex portion 24a. The plate 25 has a bulging portion 25a formed so as to surround the convex portion 24a.
Is provided with an engaging hole 25b for engaging with the annular groove 24b.

Therefore, the central portion of the convex portion 24a of the valve body 24 protrudes from the plate 25, and this convex portion 24a
Is opposed to the edge portion 21a of the pipe 21. When the valve body 23 is in a valve-open state, that is, when the plunger 12 is magnetically attracted to the core piece 15a, the central portion of the convex portion 24a of the valve body 24 is positioned at the edge of the pipe 21. The opening of the pipe 21 is closed by contacting the portion 21a.

In the shut-off valve thus constructed, the plunger 12 overcomes the spring 17 and the magnet 15 when the coil 13 of the self-holding solenoid 11 is not energized.
Is attracted to the core piece 15a by the suction force, the plunger 12 retreats, and the valve element 23 is separated from the valve seat 20 and held in the valve-open state.

As described above, the plunger 12 is connected to the core piece 1.
5a, the protrusion 2 of the valve body 24 is magnetically attracted.
The center of the pipe 4a contacts the edge 21a of the pipe 21 to close the opening of the pipe 21 and block the inside and outside of the pipe 21.

Therefore, even if the gas flowing through the gas flow passage 10 contains dust or dew condensation water is generated, these do not enter the inside of the pipe 21. Can be prevented.

The edge portion 21a of the pipe 21 is
When the protruding portion 24a comes into contact with the protruding portion 24a, the protruding portion 24a is elastically deformed.

When the coil 13 is momentarily energized to apply a reverse magnetic field, the plunger 12 advances due to the restoring force of the spring 17 and the valve body 23 contacts the valve seat 20 to close the valve. Hold.

FIG. 2 shows a second embodiment. This embodiment shows a bidirectional shutoff valve with a pilot valve, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The tip of the pipe 21 as a fitting portion of the bobbin 13b projects from the flange 22 of the self-holding solenoid 11, and the outer peripheral surface of the tip is formed with an edge portion 21a as a sealing portion by a tapered taper. I have.

An annular groove 26 is provided in the middle of the plunger 12 inserted into the pipe 21.
6 is fitted with a pilot valve 27 formed of rubber. The lower surface of the pilot valve 27 is formed on a flat surface 27a, and the flat surface 27a
The opening 21 of the pipe 21 is closed by contact with the edge 21a of the pipe 21.

An edge portion 27b is formed on the inner peripheral surface of the upper surface of the pilot valve 27 by a taper that expands, and comes into contact with the back surface of a valve body 28, which will be described later.
Is configured to be closed.

That is, the valve body 28 comprises a valve body 29 made of a metal plate and a plate 30 made of rubber joined to the upper surface of the valve body 29. A through-hole 31 is formed in the center of the valve body 29, and the small-diameter portion 12 a at the distal end of the plunger 12 penetrates through the through-hole 31.
8 protrudes from the top.

A stopper 32 is fitted at an intermediate portion of the small diameter portion 12 a of the plunger 12, and a spring receiver 33 is fixed to an end portion by an E retaining ring 34. A pilot spring 35 is interposed between the spring receiver 33 and the valve main body 29 in a compressed state, and urges the plunger 12 in a direction to push up the valve body 28 against the pilot valve 27 by pulling up the plunger 12.

Therefore, when the valve body 28 is in the open state, that is, when the plunger 12 is magnetically attracted to the core piece 15a, the pilot spring 35 pushes down the valve body 28, so that the flat surface 27a of the pilot valve 27 is pressed.
Is in contact with the edge 21a of the pipe 21 to close the opening of the pipe 21 and block the inside and outside of the pipe 21.

With the shut-off valve thus configured, the plunger 12 overcomes the spring 17 and the magnet 15 when the coil 13 of the self-holding solenoid 11 is not energized.
The plunger 12 retreats and the valve body 28 is separated from the valve seat 20 and held in the open state by the suction force of the core piece 15a.

Therefore, even if the gas flowing through the gas flow passage 10 contains dust or dew condensation water is generated, they do not enter the inside of the pipe 21, and the detrimental effects due to the intrusion of dust or dew condensation water are prevented. Can be prevented.

When the coil 13 is instantaneously energized to apply a reverse magnetic field, the plunger 12 moves forward due to the restoring force of the spring 17 and the valve body 28 contacts the valve seat 20 to close the valve. Hold.

In the closed state, the gas pressure on the primary side 10a is applied to the back surface of the valve body 28 and presses the valve body 28 against the valve seat 20, so that the valve body 28 is returned to the open state. Requires a force that overcomes the restoring force of the spring 17 and the gas pressure, but when the coil 13 is energized, the plunger 12 is drawn into the pipe 21 by the magnetic force, and the pilot valve 27 provided on the plunger 12 Slightly away from 29.

That is, the pilot valve 27 is opened, and the gas on the primary side 10a flows through the through hole 31 to the secondary side 10b. Therefore, the pressure difference between the primary side 10a and the secondary side 10b is eliminated, and the plunger 12 can be pulled in with a small force by the magnetic force.
a, the valve body 28 is separated from the valve seat 20 and held in the valve-open state.

[0034]

As described above, according to the present invention, when the plunger is magnetically attracted to the magnet at the fitting portion of the bobbin of the self-holding solenoid and the valve body is in the open state, the back of the valve body is opened. When the valve is open, dust and dew condensation do not enter the bobbin pipe. Failure can be prevented. In addition, there is an effect that the structure can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a shut-off valve in an open state according to a first embodiment of the present invention.

FIG. 2 is a vertical side view of a shut-off valve in an open state according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional side view of a conventional shut-off valve in an open state.

FIG. 4 is a vertical side view of a conventional shut-off valve in an open state.

[Explanation of symbols]

10a: primary side, 10b: secondary side, 11: self-holding solenoid, 12: plunger, 13: coil, 13b ...
Bobbin, 15: magnet, 15a: core piece, 17
... spring, 20 ... valve seat, 21 ... pipe (fitting part),
21a: Edge portion (seal portion), 23, 28: Valve body.

Continuation of the front page (72) Yoshikatsu Mikage, the inventor 1094 Fujii Shigumi, Hanyu City, Saitama Prefecture Nikkoshi Saitama Plant (56) References JP-A-1-299384 (JP, A) Japanese Utility Model Application Sho 62-156679 (JP) , U) JP-A 1-135275 (JP, U) JP-A 61-142977 (JP, U) JP-B 3-84432 (JP, B2) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) F16K 31 / 06,17 / 36

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve seat provided at a communication port that communicates between a primary side and a secondary side, a valve body that can be freely moved toward and away from the valve seat, and a spring that biases the valve body in a valve closing direction. A plunger connected to the valve body, a bobbin having a fitting portion fitted to the plunger, a coil and a magnet provided on the bobbin, and opening the valve body against the restoring force of the spring. In a shut-off valve comprising a self-holding solenoid that holds the valve, the plunger is magnetically attracted to a magnet at a fitting portion of the bobbin, and when the valve is in an open state, the plunger is in contact with the back surface of the valve. A shut-off valve having a seal portion for shutting off a bobbin fitting portion from the outside.