JPH05141562A - Cutoff valve - Google Patents

Abstract

PURPOSE:To simply and securely carry out the open/close operation of a cutoff valve with a small power by contriving such a means as to arrange a main spring for energizing a main valve toward the main valve seat side between a driving part and the main valve, and also to arrange an auxiliary spring for energizing an auxiliary valve toward the auxiliary valve seat side between the main valve and a spring receiver. CONSTITUTION:When a coil 1 is energized, the sum of respective exciting forces of the coil 1 and an attraction piece 2 becomes larger than the energizing force of an auxiliary spring 17 by which an auxiliary valve 9 is pulled down, and a plunger 3 is lifted up and is attracted to the attraction piece 2. Thus, the auxiliary valve 9 is separated from an auxiliary valve seat 12b, and an auxiliary passage 14 is opened. When gas flows into the auxiliary passage 14, the energizing force of a main spring 16 by which a main valve 12 has been pressedly brought into contact with a main valve seat 13 is reduced, so that the main valve 12 is separated from the main valve seat 13 to open a main passage S. When gas flows into the main passage S and the main valve 12 is depressed in the valve-closing direction due to the flow of gas and vibration, the energizing force of the main spring 16 decreases, while that of the auxiliary spring 17 increases, and the main valve 12 is maintained in a valve-opening position.

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 built in a gas meter and shuts off (closes) and restores (opens) a gas passage in response to a signal from an electronic circuit.

[0002]

2. Description of the Related Art So-called microcomputer meters, which have already been put into practical use at present, measure and integrate gas usage, monitor the gas flow rate at all times, and flow a large amount of gas that is different from the normal usage condition, or use it 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 in an abnormal state and sends a current to the shutoff valve to shut off the gas to prevent danger in advance. When safety is confirmed after the 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, this type of shut-off valve is normally held open by a permanent magnet when it is normal, 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 force of the spring is applied. It was shut off by. However, in recent years, there has been a need for remote control of the return operation indoors.
And the coil current at the time of this return is larger than that at the time of interruption,
The power supply capacity of the dry battery must be increased, and the development of a shutoff valve that can recover with a small amount of power is desired.

For example, FIG. 5 is shown in Japanese Utility Model Laid-Open No. 2-44178, in which the plunger 21 is formed in a hollow shape, is slidably provided in the plunger tube 23, and the auxiliary valve at the lower end of the plunger 21 is provided. The body 26 is connected. A suction piece 27 is provided on the upper end of the plunger 21 to drive the driving section 22.
Fixed to the suction piece 27, and arranged between the spring receiver 29 at the lower end of the rod 28 and the sub-valve body 26 and the compression spring 30.
Is installed. A main valve 25 having a sub valve seat 24 facing the sub valve body 26 is slidably provided on the outer peripheral edge of the lower end of the plunger tube 23. A tension spring 32, which has a weaker force than the compression spring 30, is provided between the main valve 25 and the lower portion of the drive unit 22.

In this way, when a current for moving the plunger 21 toward the drive portion 22 side is applied to the coil 33, the plunger 2
1 moves to open the sub valve body 26 first, and then the main valve 25 moves to the drive unit 22 side by the pulling spring 32.
Was separated from the main valve seat 33 and the gas flow was restored.

[0006]

However, the above-mentioned FIG.
In the configuration as shown in FIG. 6, the main valve 25 is supported only by the relatively weak tension spring 32 when the main valve 25 is open, and the main valve 25 may move in the closing direction due to the flow or vibration of the gas, which may obstruct the gas flow. there were.

Further, the positioning of the main valve 25 and the main valve seat 33 depends on the clearance between the plunger tube 23 and the sub valve body 26 and the sliding part of the main valve 25, and the main valve seat 33 is closed when it is slightly inclined. There was a problem that it was inferior in sex.

The present invention solves the above-mentioned conventional problems, and an object thereof is to realize a highly reliable shutoff valve capable of shutting off (closing) and returning (opening) with a small amount of electric power.

[0009]

In order to achieve the above object, the first means of the present invention is to provide a drive unit for moving the plunger in balance with the electromagnetic force, the magnetic force of the permanent magnet and the biasing force of the spring. A main passage for gas that has a plunger inside, a drive section is arranged in an airtight manner, and has a main valve seat on the facing surface of the plunger, a sub valve provided at one end of the plunger, and a sub valve that abuts on this sub valve. A seat, a main valve having the sub valve seat on the back surface and provided on the plunger, a sub passage of gas perforated in the sub valve seat of the main valve, and a pin projecting through the sub passage and penetrating the sub valve. , A spring receiver adjustably held by the pin, a main spring interposed between the drive unit and the main valve to urge the main valve toward the main valve seat, and a main spring interposed between the main valve and the spring receiver. The valve is provided with an auxiliary spring that abuts the auxiliary valve seat.

The second means of the present invention is such that the guide cylinder slidably abuts the side surface of the sub valve and is fixed to the main valve, and at least the abutment surface of the guide cylinder and the sub valve seat. It is equipped with a spherical auxiliary valve.

[0011]

With the above first means, the shut-off valve of the present invention is applied between the upstream side having the sub valve seat of the main valve and the downstream side facing the main valve seat, that is, both sides of the main valve. When the main valve is closed in the state where the differential pressure of the gas to be generated is large, the plunger moves toward the drive unit when a valve opening current is applied to the drive unit. At this time, the plunger moves against the urging force of the sub spring, the sub valve is first released from the sub valve seat and opened, and the sub passage circulates to allow gas to enter the downstream side of the main valve from the sub passage. To do.
When the differential pressure decreases, the differential pressure that presses the main valve toward the main valve seat decreases, and the biasing force of the auxiliary spring compressed by the movement of the plunger decreases the differential pressure and the main spring. Becomes larger than the urging force of the main valve, the main valve moves toward the drive section, and the main passage circulates. Then, even if the valve opening current is stopped, this state is maintained by the permanent magnet.

Next, when closing the shutoff valve, a valve closing current is passed through the drive unit in a direction to reduce the magnetic force of the permanent magnet, and the main spring is accurately adjusted by the current adjusted in advance by the spring bearing mechanism which is held adjustable. The valve is closed by the biasing force of 16.

Further, in the shut-off valve of the present invention by the above-mentioned second means, the spherical surface of the sub-valve rotates to the guide cylinder and the sub-valve seat when the drive unit is fixed while being inclined with respect to the main valve seat. The main valve is freely contacted, the main valve is slantingly contacted with the main valve seat, and the main spring is pressure-welded, so that the flow of gas can be blocked as in the case where the sub passage and the main passage are not slanted.

[0014]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the accompanying drawings. 1 to 3 show the respective open / closed states of the shutoff valve of the first embodiment, the drive unit K is a hollow coil 1 which gives an exciting force for moving the plunger 3 up and down in the figure, a yoke 4 forming a magnetic circuit, and a suction. A permanent magnet 5 for exciting the piece 2, a base 6 in which the yoke 4 is screwed and airtightly fixed in the main passage S, a guide pipe 7 on which the plunger 3 slides, a 0 ring 8 for sealing the gas that is a circulating gas, 8a.

A spherical 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. A threaded portion 10a is formed at the tip of the pin 10 and a nut 10b is formed. The spring receiver 11 is locked by screwing.
Reference numeral 12 is a main valve body, and a main valve portion 12a that abuts the main valve seat 13 of the main passage S and a sub valve seat 12b that abuts the sub valve 9 are formed.
Further, a sub passage 14 is formed. Reference numeral 15 denotes a plastic guide cylinder having a good sliding property, which slidably contacts the side surface of the sub valve 9 and the sub valve seat 12b when the sub valve 9 is closed.

A main spring 1 is provided between the base 6 and the main valve 12.
6 and a sub spring 17 is interposed between the spring receiver 11 and the main valve 12 under a compressive load. Coil 1
Is supplied with electric power for opening and closing the main valve 12 from an electronic circuit unit (not shown).

Based on the above configuration, the closed state of the shutoff valve shown in FIG. 1 will be described. The main valve 12 is pressed against the main valve seat 13 by the compressive force of the main spring 16 to close the main passage S. At this time, the plunger 3 is pulled by the compressive force of the sub spring 17 and the sub valve 9 is pressed against the sub valve seat 12b to close the sub passage 14, so that the gas flows through the sub passage 14 as well as the main passage S. Has been cut off. The suction force of the plunger 3 is reduced by the distance between the suction piece 2 and the pitch 1, and the urging force of the sub spring 17 is superior, so that this state is maintained by itself.

Next, the initial operation of opening the shutoff valve shown in FIG. 2 will be described. First, when a current for moving the plunger 3 upward is applied to the coil 1, the sum of the exciting force of the coil 1 and the exciting force of the attracting piece 2 becomes larger than the urging force of the auxiliary spring 17 pulling the auxiliary valve 9 downward. , The plunger 3 moves upward one distance and is attracted to the suction piece 2. Then, the sub spring 17 is compressed, the sub valve 9 is separated from the sub valve seat 12b, the sub passage 14 is opened, and the gas flows into the downstream side of the main passage S (the side where the sub spring 17 is located).

Next, the open state of the shutoff 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 rises. On the other hand, in the state of FIG. 1, the main valve 12 was closed because the differential pressure applied to the main valve 12 and the compression force of the main spring 16 were larger than the suction force of the suction piece 2. Main valve 12 to main valve seat 13
The force to press against is reduced. The force of pressing the main valve 12 against the main valve seat 13 by adding this pressing force to the urging force of the main spring 16 becomes smaller than the urging force of the auxiliary spring 17 generated by the plunger 3 moving one distance, The valve 12 is separated from the main valve seat 13 to open the main passage S.

In the main valve 12, the upper end of the plunger 3 is the suction piece 2
It is adsorbed by and is stopped at a position a distance 1 above the time of closing. After that, even if the energization of the coil 1 is stopped, the plunger 3 comes into contact with the attraction piece 2 and is attracted by the strong attraction force of the permanent magnet 5, and the main valve 12 is self-held in this state. Then, when the gas flows while the main valve 12 is open, a force that the flow and vibration of the gas push toward the downstream side is added to the urging force of the main spring 16 in the main valve 12. But,
The plunger 3 is attracted by the strong suction force of the suction piece 2 and resists this force, and the urging force of the sub spring 17 must be overcome in order for the main valve 12 to move downward. However, when the main valve 12 tries to move downward, the urging force of the main spring 16 decreases and the urging force of the auxiliary spring increases, so that the urging force acts on the main valve 12.
It becomes larger than the force of pushing 2 toward the downstream side, and the main valve 12 is stably maintained in the position moved by a distance 1'above the time of closing.

Next, to close the shutoff valve, the permanent magnet 5
An electric current is passed through the coil 1 in the direction in which the magnetic force due to is reduced. Occlusion
The current that closes the valve shuts off the plunger 3 from the suction piece 2.
The urging force of the main spring 16 urging in the separating direction,
The magnetic force of the permanent magnet 5 pulls the plunger 3 and the suction piece 2.
It becomes the value that reduces the force until the matching suction force becomes equal.
Generally, the current value at which the shut-off valve closes is not allowed from the power supply side.
It is desirable that the width is small, while the shutoff valve side is
Variation of pulling 16, permanent magnet 5, and other magnetic circuits
Breaking current varies due to the error. In the example, this variation
Adjustable spring retainer to prevent
The main spur is attached by turning the nut 10b.
The urging force of the ring 16 can be adjusted and the breaking current can be set accurately.
Can be set. This will be explained with reference to FIG.
Sucker 3 and suction piece 2 are in a sucked state (Figs. 2-3)
The position of the main valve 12 on the horizontal axis (to the right
Direction), the biasing force of the main spring 16 and the auxiliary spring 17
Shown on the vertical axis. Each spring has a spring constant
Therefore, the main spring 16 is at the position C where the main valve 12 is closed.
Has the weakest biasing force, and the biasing force is
Become stronger. On the other hand, the sub spring 17 is the opposite. So
Then, when the main valve 12 is open (Fig. 3),
Main valve 1 at the point where the urging force of the ring 16 and the auxiliary spring balance.
2 will stop, but by turning the nut 10b
The point at which the main valve 12 opens and then stops is 0 ₁~ 0₃Tona
The biasing force of the main spring 16 is f₁~ F₃Changed
It That is, by turning the nut 10b, the shutoff valve
The biasing force of the main spring 16 in the open state can be adjusted,
The breaking current can be adjusted and the breaking current can be set accurately.

As described above, in this embodiment, even when the main valve 12 is in the open state and the flow of gas or an impact is received, the force of the main spring 16 for urging the main valve 12 in the closing direction is weakened, and the main valve 12 is weakened. Since the force of the sub spring 17 for urging the opening 12 is increased, both springs effectively act to suppress the closing of the main valve. Therefore, it is not necessary to use a strong spring to suppress the closing of the main valve, and the current for opening the shutoff valve can be reduced to reduce the capacity of the battery power source, reduce the power, and downsize the shutoff valve. it can.

Further, since the breaking current can be set accurately, it is not necessary to design the battery power source with an extra margin, and the capacity can be reduced.

It is also conceivable that the drive unit K is inclined and fixed with respect to the main valve seat 13, but at this time, the main valve seat 1
With respect to 3, the plunger 3 also moves up and down on the inclined axis. When the main valve 12 is fixed orthogonally to the plunger 3, the main valve 12 is in contact with the main valve seat 13 with the inclination angle, and the main passage S cannot be closed properly.
However, the sub-valve 9 is guided by the guide cylinder 15 and abuts on the sub-valve seat 12b by a swingable swinging mechanism, and the main passage S as well as the sub-passage 14 has a small biasing force of both springs 16 and 17. Can be closed properly with. In this way, if the head swing mechanism is adopted, it is considered that the drive unit K is considered to frequently occur in practical use.
It is not necessary to press the main valve 12 against the main valve seat 13 by the urging force of the main spring 16 which is unnecessarily strong at the time of fixing the inclination of
The biasing force of the main spring 16 can be reduced to further reduce the electric power.

If the main valve 12 is made of an elastic material such as rubber and the abutting portions of the springs 16 and 17 are protected by metal or the like, the auxiliary valve 9 and the valve seats 12b and 13 of the main valve 12 are protected. It is expected that the closing performance of the valves will be further improved, and the urging forces of both springs 16 and 17 will be further reduced to further reduce the electric power of the shutoff valve.

[0026]

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

According to the first aspect of the present invention, the main valve can be stably maintained in the open position while suppressing the biasing force of the main spring to reduce the electric power when the valve of the drive unit is opened. It is possible to reduce the passage resistance and downsize the shutoff valve. Further, since the biasing force of the main spring can be adjusted, the breaking current can be set accurately.

According to the present invention, the sub-passage and the main passage can be properly closed even when the swinging mechanism including the spherical sub-valve and the guide cylinder is tilted and fixed to the main valve seat of the drive unit, and further reduction in electric power is expected. it can.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing the initial opening state.

FIG. 3 is a sectional view showing the same opening state.

FIG. 4 is a characteristic diagram of the spring bearing mechanism that is held so as to be adjustable.

FIG. 5 is a sectional view showing a conventional shutoff valve.

[Explanation of symbols]

 K Drive part 3 Plunger 9 Sub valve 10 Pin 11 Spring receiver 12 Main valve 12b Sub valve seat 13 Main valve seat 14 Sub passage S Main passage 15 Guide cylinder 16 Main spring 17 Sub spring

Claims (2)

[Claims] 1. A drive unit for moving a plunger in balance with an electromagnetic force and an urging force of a spring, and a plunger inside, the drive unit is disposed in a secret manner, and a main valve seat is provided on an opposite surface of the plunger. A main passage for gas, a sub valve provided at one end of the plunger, a sub valve seat that abuts on this sub valve, a sub valve seat having this sub valve seat on the back surface, and a main valve provided on the plunger and a sub valve of this main valve. A gas sub-passage perforated in the valve seat, a pin projecting from the sub-valve and penetrating the sub-passage, a spring bearing adjustably held by this pin, and a main valve that is installed between the drive unit and the main valve. A shut-off valve that includes a main spring that urges the valve seat side and a sub spring that is interposed between the main valve and the spring receiver and that abuts the sub valve against the sub valve seat. 2. A guide cylinder which slidably contacts the side surface of the auxiliary valve and is fixed to the main valve, and a secondary valve having a spherical contact surface between at least the guide cylinder and the auxiliary valve seat. The shutoff valve according to 1.