JPH06323462A - Gas cutoff valve - Google Patents

Abstract

PURPOSE:To shorten a projecting length to a main passage while offsetting a spring bearing and a sub-spring to each other, and restrain these from becoming an obstacle to gas in the main passage by arranging a contact part with the sub-spring of a main valve in a recessed shape inside of the main valve. CONSTITUTION:When an electric current is carried to a coil 1, a plunger 3 is attracted to an attracting-piece 2. As a result, a sub-spring 16 is compressed, and a sub-valve 9 is separated from a sub-valve seat 12, so that a sub passage 14 is opened. When gas is flowed in from the sub-passage 14, differential pressure by which a main valve 12 is brought into pressure contact with a main valve seat 13 is reduced. Since energizing force of a main spring 15 is reduced more than energizing force of a sub-spring 16, the main valve 12 is separated from the main valve seat 13. The main valve 12 is self-held, and a main passage S is opened. By the way, a contact part with the sub spring 16 of the main valve 12 is formed in a recessed shape inside of the main valve 12. Thereby, the sub-spring 16 and this spring bearing 11 are offset to each other, and a projecting quantity of these to the main passage S is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutoff valve which is built in a gas meter and which receives a signal from an electronic circuit to cut off (close the valve) or return (open) the gas passage.

[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 if a signal from an external sensor such as a gas leak alarm is received, the microcomputer judges that it is in an abnormal state and sends a current to the gas shutoff valve to shut off the gas to prevent danger in advance. When the safety is confirmed after the gas shutoff valve is shut off and the shutoff valve is to be restored (opened), a person pushes a mechanical reset button provided on the gas meter to restore the shutoff valve.

Conventionally, a gas shutoff valve of this type is normally held open by a permanent magnet when it is normally shut off, and when an abnormality occurs and shuts off, a current is passed through the coil in a direction to reduce the attraction force of the permanent magnet and the spring is closed. It was shut off by the power of. However, in recent years, there has been a need for remote control of the return operation indoors. The coil current at the time of this recovery is larger than that at the time of disconnection, the power capacity of the dry battery must be increased, and there is a demand for the development of a gas cutoff valve that can recover with a small amount of power.

For example, there is a shut-off valve as disclosed in Japanese Patent Laid-Open No. 4-254084. Hereinafter, a conventional embodiment will be described with reference to the accompanying drawings. FIG. 7 shows the closed state of the gas cutoff valve of the conventional example, in which the drive unit K excites the hollow coil 21 that gives an exciting force to move the plunger 23 left and right in the figure, the yoke 24 that forms a magnetic circuit, and the suction piece 22. The permanent magnet 25, the yoke 24 are fixed to the main passage S by screws, and the base 26 is hermetically fixed to the main passage S, and the guide pipe 27 on which the plunger 23 slides.

A sub-valve 28 is formed at one end of the plunger 23, and a pin 29 projects from the tip of the sub-valve 28 and a spring receiver 30 is locked. 31 is the main valve,
The main valve portion 31a and the auxiliary valve 2 that come into contact with the main valve seat 32 of the main passage S
8 is formed, and a sub valve seat 31b that abuts the sub passage 3 is formed.
3 is formed.

A main spring 34 is interposed between the base 26 and the main valve 31, and a sub spring 35 is interposed between the spring receiver 30 and the main valve 31 so as to receive a compressive load.

In this way, when a current for moving the plunger 23 to the drive portion K side is applied to the coil 21, the plunger 23
Moves to open the sub valve 28 first, and then the main valve 31 moves to the drive portion K side by the sub spring 35, the main valve 31 is separated from the main valve seat 32, and the flow of gas is restored.

[0008]

However, in the above-mentioned structure, as shown in the valve open state in FIG. 8, the spring bearing 30 and the auxiliary spring 35 attached to one end of the plunger 23 are connected to the main passage S of the gas. There is a problem in that a large amount of gas pressure loss occurs because it largely protrudes inward and obstructs gas flow when the main valve 31 is open.

Further, as shown in FIG. 9, when the main valve 31 returns from the closed state and opens, the plunger 23 is attracted against the reaction force of the auxiliary spring 35 and the auxiliary valve 28 is opened. 31 b, the sub passage 33 is opened, and the gas flows downstream of the main passage S. Then, the differential pressure of the gas applied to both surfaces of the main valve 31 becomes small and the main valve 31 is opened. However, at this time, the spring receiver 30 covers the sub passage 33, obstructs gas flow in the sub passage 33, and prevents reduction of the differential pressure applied to the main valve 31. Therefore, the time required to open the valve becomes long, and the coil 21 needs to be energized for a long time. As a result, a large amount of electric energy is required to open the valve.

The present invention solves the above-mentioned conventional problems, and realizes a gas cutoff valve which is small in size, has a small pressure loss of flowing gas, and can be closed (closed) and returned (opened) with a small amount of electric power. With the goal.

[0011]

In order to solve the above-mentioned problems, the first means of the present invention is to drive the projecting plunger in a balanced manner between the electromagnetic force and the urging force of the spring, and to project it inside the plunger. The drive section is airtightly arranged, the main passage of gas having a main valve seat on the facing surface of the plunger, the auxiliary valve provided at the protruding end of the plunger, and the auxiliary valve seat abutting the auxiliary valve, A main valve having a sub valve seat on the back surface, a sub passage for gas perforated in the sub valve seat of the main valve, a spring receiver protruding from the sub valve, penetrating the sub passage, and integrally held by the sub valve. , A main spring that is interposed between the drive unit and the main valve to bias the main valve toward the main valve seat side, and a sub spring that is interposed between the main valve and the spring receiver and that abuts the sub valve on the sub valve seat. The auxiliary valve of the main valve is provided with a contact portion recessed in the main valve.

Further, the second means of the present invention comprises a sub spring having a tapered shape in which the outer diameter of the abutting spring receiving side is smaller than that of the main valve seat side.

The third means of the present invention comprises a spring bearing provided with a vent hole.

[0014]

With the above first means, the gas cutoff valve of the present invention has a structure in which the contact portion of the main valve with the auxiliary spring is recessed in the main valve. The protruding length of the receiver can be made small, and the gas flowing through the main passage is unlikely to become an obstacle when the main valve is open, so the pressure loss of the gas flow can be made small.

Further, in the shutoff valve of the present invention according to the above-mentioned second means, since the outer diameter of the auxiliary spring is smaller than the outer diameter of the main valve seat side and has a tapered shape, the main valve is opened in the main passage. Because it is less likely to interfere with the gas flowing through the
The pressure loss of the gas stream can be reduced.

Further, in the shut-off valve of the present invention by the above-mentioned third means, since the vent hole is provided in the spring receiver, like the first and second means, when the main valve is open, the main passage is opened. Since it has the function of reducing the resistance of the gas flow flowing therethrough, the pressure loss of the gas flow can be reduced. In addition, it facilitates gas flow in the auxiliary passage during the opening operation of the gas cutoff valve and facilitates relaxation of the differential pressure applied to the main valve. As a result, the valve opening time can be shortened with a smaller electric power.

[0017]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show the open / closed state of the shutoff valve of the first embodiment, the drive unit K is a hollow coil 1 that gives an exciting force to move the plunger 3 to the left and right of the drawing, a yoke 4 forming a magnetic circuit, and a suction piece. 2, a permanent magnet 5 for exciting 2, a base 4 in which the yoke 4 is caulked and airtightly fixed in the main passage S, a guide pipe 7 on which the plunger 3 slides, an O-ring 8 for sealing a gas as a circulating gas, It consists of 8a.

A sub-valve 9 is formed at one end of the plunger 3, and a pin 10 projects from the tip of the sub-valve 9 and a spring receiver 11 is locked. Reference numeral 12 denotes a main valve body, which includes a main valve 12a that abuts the main valve seat 13 of the main passage S, a sub valve seat 12b that abuts the sub valve 9, and a sub passage 14.

A main spring 1 is provided between the base 6 and the main valve 12.
5 and a sub spring 16 is interposed between the spring receiver 11 and the main valve 12 under a compressive load. here,
The contact portion of the main valve 12 with the sub spring 16 is offset to the right from the contact surface of the main valve 12 with the main valve seat 13, and the sub spring 16 has a structure in which the sub spring 16 is sunk and positioned. ing. Electric power for opening and closing the main valve 12 is supplied to the coil 1 from an electronic circuit (not shown).

The closed state of the gas cutoff valve shown in FIG. 1 will be described based on the above configuration. Main valve 12 is main spring 15
The main passage S is closed by being pressed against the main valve seat 13 by the compressive force of. At this time, the plunger 3 moves the auxiliary spring 16
The sub-valve 9 is pressed against the sub-valve seat 12b to close the sub-passage 14 due to the compressive force of the gas, and the flow of gas is blocked not only in the main passage S but also in the sub-passage 14. The plunger 3 is reduced by the distance between the suction piece 2 and the pitch L, and the urging force of the auxiliary spring 16 is greater, so that this state is maintained by itself.

Next, the initial operation of opening the gas cutoff valve shown in FIG. 2 will be described. First, when a current is applied to the coil 1 to move the plunger 3 to the right, the plunger 3 moves to the right by a distance L and is attracted to the suction piece 2. Then, the sub spring 16 is compressed and the sub valve 9 is moved to the sub valve seat 12
b, the sub-passage 14 is opened and the gas flows into the main passage S.
Flows into the downstream side (the side where the sub spring 16 is located).

Finally, the open state of the gas cutoff valve shown in FIG. 3 will be described. When the gas enters the sub-passage 14 in the state of FIG. 2, the pressure difference between the main valve 12 and the main valve seat 13 due to the pressure difference between the pressures of the gas on the upstream side and the gas on the downstream side changes to that on the downstream side. It becomes smaller as the pressure increases. Then, the main valve 1 in which the pressure contact force due to this differential pressure is added to the urging force of the main spring 15
The force of pressing 2 against the main valve seat 13 becomes smaller than the urging force of the auxiliary spring 16 generated by the plunger 3 moving rightward L, and the main valve 12 separates from the main valve seat 13. The right end of the plunger 3 of the main valve 12 is adsorbed by the suction piece 2, and stops at a position at a distance L from the time of closing. After that, even if the power supply to the coil 1 is stopped, the plunger 3 comes into contact with the suction piece 2 and is attracted by a strong suction force, the main valve 12 is self-held in this state, and the main passage S is opened.

Here, what is important in realizing a small-sized, low-power gas cutoff valve is, firstly, as a precondition, when the valve is open, the valve body does not obstruct the flow of gas which is the flowing gas. ,
Secondly, the gas passage resistance is small, and secondly, the gas shut-off valve has good return mobility and the time from the shut-off state to the opening is short and the coil energization time is short.

Since the gas cutoff valve of the present invention has a structure in which the contact portion of the main valve 12 with the sub spring 16 is recessed in the main valve 12, the sub spring 16 must be offset to the right. You can Therefore, the position of the spring bearing 11 that receives the sub spring 16 can also be offset to the right, and the protruding volume of the spring bearing 11 and the sub spring 16 in the main passage S becomes smaller. As a result, the main valve 12 is less likely to become an obstacle to the gas flowing through the main passage S when the main valve 12 is open, so that the pressure loss of the gas flow can be reduced and the gas cutoff valve can be downsized.

If the main valve 12 is made of an elastic material such as rubber and the contact points of the springs 15 and 16 are protected by metal or resin, the auxiliary valve 9 and each valve seat 12b of the main valve 12 are protected. , 13
The closing performance with and is further improved, and both springs 15,
It is expected that the urging force of 16 will be further reduced and the gas cutoff valve will be further reduced in electric power.

In order to prevent the pressure loss, the moving stroke L from the opened state to the closed state of the main valve 12 is increased, and the protrusion length of the spring receiver 11 and the auxiliary spring 16 into the main passage S is reduced. Also, a method of increasing the diameter of the main valve 12 can be considered. However, these methods require the coil 1 to attract the plunger 3, which is required when the main valve 12 is opened.
This leads to a dramatic increase in the electrical energy given to, and is contrary to the small electric power.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The configuration and operation of the gas cutoff valve of the present embodiment are substantially the same as the first embodiment except that only the valve body structure is different, and the same parts are designated by the same reference numerals and have the same name and operation. Detailed description is omitted and only different parts will be described.

FIG. 4 shows the open state of the gas cutoff valve of the second embodiment. The gas cutoff valve of the present invention is provided with the auxiliary spring 17
Since the outer diameter of the spring receiver 18 side is smaller than that of the main valve 12 side to form a taper shape, the volumes of the spring receiver 18 and the sub spring 17 protruding into the main passage 14 can be reduced. As a result, when the main valve 12 is open, the gas flowing through the main passage S is unlikely to become an obstacle, so that the same effect as the first embodiment can be expected.

(Third Embodiment) Finally, a third embodiment of the present invention will be described with reference to FIGS. Similar to the second embodiment, the same parts are designated by the same reference numerals and have the same name and operation, and detailed description will be omitted and only different parts will be described.

FIG. 5 shows the open state of the gas cutoff valve of the third embodiment, and FIG. 6 shows the initial operating state of opening the gas cutoff valve. As shown in FIG. 5, the gas cutoff valve of the present invention is provided with the vent H in the spring bearing 19, so that the main valve 12 is in the open state as in the first and second embodiments. In order to reduce the resistance of the gas flow flowing through the passage S,
The pressure loss of the gas stream can be reduced. In addition, it facilitates gas flow in the sub passage 14 at the initial operation of opening the gas cutoff valve, and promotes relaxation of the differential pressure applied in the direction of closing the main valve 12. Therefore, since the main valve 12 can be restored in a shorter time, the time for energizing the coil 1 can be shortened, and as a result, the valve opening can be performed with a smaller electric power.

[0031]

As described above, according to the gas cutoff valve of the present invention, the following effects can be obtained.

According to the first aspect of the present invention, since the contact portion of the main valve with the sub spring is recessed in the main valve, the spring receiver in the main passage and the protruding length of the sub spring are reduced. . As a result, since the gas flowing through the main passage is less likely to become an obstacle when the main valve is open, the pressure loss of the gas flow can be reduced and the gas cutoff valve can be downsized.

According to a second aspect of the present invention, since the outer diameter of the auxiliary spring is smaller than that of the main valve seat side and has a tapered shape, the shapes of the spring receiver and the auxiliary spring protruding into the main passage can be reduced. It is possible to further prevent the pressure loss of the gas flow and reduce the size of the gas cutoff valve as compared with the above gas cutoff valve.

In the third aspect of the present invention, since the spring support is provided with the vent hole, in addition to the same effect as that of the gas cutoff valve according to the first and second aspects, at the time of the initial operation of opening the gas cutoff valve, By promoting the relaxation of the differential pressure applied in the direction to close the main valve, the main valve can be restored in a shorter time, so the time to energize the coil can be shortened and the power consumption for opening the valve can be reduced. Becomes

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing an initial opening operation of the shutoff valve.

FIG. 3 is a sectional view showing an open state of the shutoff valve.

FIG. 4 is a sectional view showing an opened state of a gas cutoff valve according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a closed state of a gas cutoff valve according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing an initial stage of opening operation of the shutoff valve.

FIG. 7 is a sectional view showing a closed state of a conventional gas cutoff valve.

FIG. 8 is a sectional view showing an open state of the shutoff valve.

FIG. 9 is a cross-sectional view showing an initial opening operation of the shutoff valve.

[Explanation of symbols]

 3 Plunger 9 Sub valve 11, 18, 19 Spring bearing 12 Main valve 12a Main valve portion 12b Sub valve seat 13 Main valve seat 14 Sub passage 15 Main spring 16, 17 Sub spring K Drive portion S Main passage H Vent hole

Claims (3)

[Claims] 1. A drive unit for interlocking a projecting plunger with a balance between an electromagnetic force and a biasing force of a spring, and a drive unit projecting inside the plunger to arrange the drive unit in an airtight manner. A main valve seat is provided on a surface facing the plunger. The main passage of the gas, the auxiliary valve provided at the protruding end of the plunger, the auxiliary valve seat that abuts against this auxiliary valve, the main valve that has this auxiliary valve seat on the back surface, and the auxiliary valve seat of this main valve. The perforated gas sub-passage, the spring receiver that protrudes from the sub-valve and penetrates the sub-passage, is integrally held by the sub-valve, and is interposed between the drive unit and the main valve so that the main valve is on the main valve seat side. A main spring for urging and a sub spring interposed between the main valve and the spring receiver for contacting the sub valve with the sub valve seat are provided, and the contact portion of the sub spring of the main valve is recessed in the main valve. A gas cutoff valve. 2. A gas cutoff valve according to claim 1, further comprising a sub spring having a tapered shape, the outer diameter of the abutting spring receiving side being smaller than that of the main valve seat side. 3. A spring receiver provided with a ventilation hole.
Gas cutoff valve as described.