JPH06300160A - Gas emergency trip valve - Google Patents

Abstract

PURPOSE:To reduce the occurrence of slide resistance between a plunger and a guide pipe and to improve an effect to reduce a consumption power of a gas emergency trip valve and durability by a method wherein surface treatment, performed so that eutectoid of particulates of resin or a metallic compound having lubricity and wear resistance is executed in a metallic matrix, is applied on the inside of a metallic drive part. CONSTITUTION:A plunger 1 is slid over the inside of a guide pipe 7. Since the plunger 1 is slid over the inside of a metallic guide pipe 2 in which eutectoid of particulates of resin or a metallic compound having lubricity and wear resistance is executed at least in the inside diameter side of a surface, slide resistance between the plunger 1 and the guide pipe 7 is extremely reduced. As a result, a consumption power of a gas emergency trip valve is reduced and slide durability is sharply improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual reset type gas shutoff valve which is built in a gas meter and shuts off (closes) a gas passage upon receiving a signal from an electronic circuit. The present invention relates to a gas cutoff valve that returns (opens).

[0002]

2. Description of the Related Art The so-called microcomputer meter, which has already been put into practical use, measures and integrates the amount of gas used, and constantly monitors the flow rate of the gas to flow a large amount of gas that is different from the normal state of use, or to use gas for a long time. If it continuously flows or a signal from an external sensor such as a gas leak alarm is received, the microcomputer judges that it is abnormal and sends a current to the shutoff valve to shut off the gas and prevent danger in advance. When safety is confirmed after shutting off the shut-off valve and you want to reset (open) the shut-off valve, a manual reset type gas shut-off valve is used in which a person pushes the mechanical reset button provided on the gas meter to restore. .

Further, in recent years, in response to the need for remote control of the return operation from indoors, an automatic return type gas cutoff valve which is electrically operated for the return (valve opening) is also being developed. For example, it is a gas cutoff valve as disclosed in JP-A-4-254084.

A conventional embodiment will be described below with reference to the accompanying drawings. FIG. 3 shows a closed state of a conventional gas cutoff valve, in which a drive unit K is a hollow coil 1 that gives an exciting force to move a main valve 11 fixed to a plunger 10 to the left and right in the figure.
2, a yoke 13 that forms a magnetic circuit, a permanent magnet 14 that excites one-sided attraction, a base 15 that is airtightly fixed to the main passage S,
A guide pipe 16 on which the plunger 10 slides is arranged inside the drive unit K. Between the base 15 and the main valve 11,
The spring 17 is compressed and interposed. Further, a main valve seat 18 is arranged in the main passage S so as to face the main valve 11. In this way, when a current is applied to the coil 12 to move the plunger 10 toward the main valve seat 18, the plunger 10 moves to bring the main valve 11 into close contact with the main valve seat 18 and close the gas. This operation is the same for both the manual reset type gas shutoff valve and the automatic reset type gas shutoff valve. Next, in the case of returning (valve opening) In the manual return type, when the person pushes the mechanical return button provided on the gas meter, the plunger 10 moves to the drive unit K side, and the main valve 11 moves the main valve seat 18 The gas flows further away. In the automatic return type, the coil 12 has a plunger 1
The plunger 10 is supplied with a current for moving 0 to the drive unit K side.
The main valve 11 is moved away from the main valve seat 18 and the gas flows.

[0005]

However, in the above-mentioned structure, the sliding portion between the plunger 10 and the guide pipe 16 slides between the metals to increase the sliding resistance, so that an excessive current is applied to the coil 12. There is a problem that the gas shutoff valve consumes a large amount of power because the plunger 10 does not move reliably unless the flow exciting force is increased.
Further, when the plunger 10 slides on the inner surface of the guide pipe 16, the clearance for sliding causes the plunger 10 to incline, which causes local contact with the guide pipe 16. There was a problem that the durability was extremely poor. In particular, when commercializing an automatic return type gas cutoff valve aiming at indoor opening and closing, the number of times of opening and closing was increased, so durability was a major issue.

The present invention solves such a conventional problem by significantly reducing the resistance of the sliding portion, reducing the current flowing through the coil to reduce the power consumption of the gas cutoff valve, and between the plunger and the guide pipe. It is intended to dramatically improve the sliding durability of and improve the durability of the gas cutoff valve.

[0007]

In order to solve the above problems, a gas cutoff valve according to the present invention comprises a main valve mounted on a plunger and a main gas passage having a main valve seat on the opposite surface of the main valve. ,
An airtight drive unit that drives the plunger by electromagnetic force, a spring that urges the main valve to the main valve seat side by interposing the main valve and the drive unit, and a lubricity inside the drive unit. Fine particles of a resin or a metal compound having abrasion resistance are dispersed in a metal plating solution and subjected to a plating treatment, and a metal pipe in which the resin or the metal compound is co-deposited in a metal matrix is provided at least on the surface. It is a thing.

[0008]

With the above means, the gas cutoff valve of the present invention is subjected to a surface treatment in which at least the inner surface of the guide pipe is co-deposited with fine particles of a resin or metal compound having lubricity and wear resistance in a metal matrix. Therefore, the sliding resistance between the plunger and the guide pipe can be remarkably reduced, and as a result, the power consumption of the gas cutoff valve can be reduced and the durability of the gas cutoff valve can be significantly improved.

[0009]

Embodiments of the gas cutoff valve of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show the open / closed state of an embodiment of the gas cutoff valve of the present invention, in which the drive unit K is a hollow coil that gives an exciting force to move the main valve 2 fixed to the plunger 1 left and right in the figure. 3, a yoke 4 forming a magnetic circuit,
A permanent magnet 5 that excites one-sided attraction, a base 6 that is hermetically fixed to the main passage S, a plunger 1 slides inside the drive unit K, and a resin or metal compound that has lubricity and wear resistance at least on the surface A metallic guide pipe 7 in which the fine particles of (1) are co-deposited in a metal matrix is arranged. A spring 8 is compressed and interposed between the base 6 and the main valve 2. Further, a main valve seat 9 is arranged in the main passage S so as to face the main valve 2.

The closed state of the gas cutoff valve shown in FIG. 1 will be described based on the above configuration. When a current is applied to the coil 3 to move the plunger 1 to the main valve seat 9 side, the plunger 1 moves to bring the main valve 2 into close contact with the main valve seat 9 and close the gas. This operation is the same for both the manual reset type gas shutoff valve and the automatic reset type gas shutoff valve. Next, the operation of opening the gas cutoff valve shown in FIG. 2 will be described. When returning (opening valve) In the manual return type, when the person pushes the mechanical return button provided on the gas meter, the plunger 1 is driven by the drive unit K.
The main valve 2 moves away from the main valve seat 9 and the gas flows.
Further, in the automatic return type, a current is supplied to the coil 3 to move the plunger 1 to the drive unit K side to move the plunger 1, the main valve 2 is separated from the main valve seat 9, and the gas flows.

As described above, in the gas cutoff valve, since the plunger 1 slides inside the guide pipe 7,
The sliding resistance between the plunger 1 and the guide pipe 7 is kept extremely low, which is the most effective means for reducing power consumption and improving durability. In the gas cutoff valve of the present invention, the plunger 1
Is configured to slide inside a metallic guide pipe 2 in which fine particles of a resin or a metal compound having lubricity and wear resistance are co-deposited in a metal matrix on at least the inner diameter side of the surface. The sliding resistance between the guide pipes 7 can be made extremely low.

As a result, the power consumption of the gas cutoff valve can be reduced and the sliding durability can be remarkably improved.

[0013]

As is clear from the above description, in the gas cutoff valve of the present invention, the plunger is eutectoid with fine particles of resin or metal compound having lubricity and wear resistance on at least the surface of the plunger in the metal matrix. The sliding resistance between the plunger and the guide pipe can be made extremely low because it is configured to slide inside the metal guide pipe.

As a result, the power consumption of the gas cutoff valve can be reduced and the sliding durability can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a closed state of a gas cutoff valve according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an open state of the shutoff valve.

FIG. 3 is a sectional view of a conventional gas cutoff valve.

[Explanation of symbols]

 1 Plunger 2 Main valve 3 Coil 4 Yoke 5 Permanent magnet 7 Guide pipe 9 Main valve seat K Drive part S Main passage

Claims (1)

[Claims] 1. A main valve attached to a plunger, a main gas passage having a main valve seat on an opposing surface of the main valve, a drive section which drives the plunger by electromagnetic force and has airtightness, and the main section. A valve and a spring for urging the main valve toward the main valve seat, which is interposed in the drive unit; and fine particles of a resin or metal compound having lubricity and wear resistance inside the drive unit, which are used as a metal plating solution. A gas shutoff valve provided with a metallic pipe, which is dispersed in a metal plate and subjected to plating treatment, and at least the inner diameter side of which has the resin or metal compound co-deposited in a metal matrix.