JPH0544868A - Shut-off valve - Google Patents

Abstract

PURPOSE:To provide a shut-off valve which is opened or closed smoothly, can improve reliability stably in either opened or closed condition of the valve, and can be operated at low voltage. CONSTITUTION:When electricity is not conducted into an electromagnet 51, a main valve 29 is attracted to a main valve set 25 by attracting a rotating body 40 due to attraction force of a permanent magnetic 47 and a pilot valve 33 is attracted to a pilot valve seat 32 to shut off a flow passage. When electricity is conducted to the electromagnet, the rotating body is estranged due to magnetic force which repels against the permanent magnet, and the pilot valve is separated from the pilot valve seat by this rotating body to open an auxiliary flow passage 31. Consequently, difference in pressure between primary pressure on the flow-in port side and secondary pressure on the flow-out port side id reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve incorporated in a fluid flow meter, for example, a gas meter, which shuts off the flow of gas 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 sensing a gas leak are known. In addition, a safety device has been put into practical use, which combines these seismic sensors and gas leak alarms with a shutoff valve to activate the shutoff valve in the event of a seismic shock or gas leak to shut off gas flow. There is.

For example, JP-A-64-6578 and JP-A-64-6580 are solenoid type shut-off valves, and normally a valve element facing a flow port is attached by a spring in a valve closing direction. Although energized, in the non-energized state of the self-holding solenoid, it overcomes the spring and is attracted to the magnet, and the valve element is separated from the valve seat and is in the valve open state.

When the coil of the self-holding solenoid is momentarily energized to apply a reverse magnetic field, the restoring force of the spring causes the valve body to press against the valve seat to close the valve. That is, when an operation signal is input to the self-holding solenoid from the seismic sensor or a gas leak alarm that senses a gas leak, the shutoff valve is actuated to shut off the gas flow.

This solenoid type shutoff valve is generally constructed as shown in FIG. That is, 1 is a housing, and 2 is a partition wall that partitions the gas flow passage 3 between the upstream side 3a and the downstream side 3b. A valve seat 5 having a flow port 4 is provided in a part of the partition wall 2, and a shutoff valve unit 6 facing the valve seat 5 is provided in the housing 1.

The shutoff valve unit 6 will be described below.
Is a bidirectional solenoid, the internal structure of which is a yoke 9 coupled to the flange 8, a coil 11 wound around the outer circumference of a bobbin 10 on the inner circumference of the yoke 9, and an upper side of the bobbin 10. A permanent magnet 12 arranged coaxially with
The bobbin 10 is composed of an anvil 14 arranged under the central hole of the bobbin 10 and receives the plunger 13. A valve body 15 facing the valve seat 5 is provided at the upper end of the plunger 13. Further, a spring 16 for biasing the valve body 15 in the valve closing direction is interposed between the lower surface of the valve body 15 and the flange 8.

Therefore, when the solenoid 7 is in the non-energized state, it overcomes the spring 16 and the plunger 13 is attracted to the permanent magnet 12, and the valve body 15 is separated from the valve seat 5 and is in the valve open state. Then, when the coil 11 of the solenoid 7 is momentarily energized to apply a reverse magnetic field, the restoring force of the spring 16 causes the valve body 15 to come into pressure contact with the valve seat 5 to close the valve.

When the valve body 15 in the closed state is to be opened again, the solenoid 7 is energized and the spring 1
The plunger 13 is pulled in against the restoring force of 6.

[0009]

However, in the shut-off valve configured as described above, the restoring force of the spring 16 urges the valve body 15 in the valve closing direction, and the coil 11 of the solenoid 7 is energized to reverse. When a magnetic field is applied, the valve body 15 is brought into pressure contact with the valve seat 5 and closed by the restoring force of the spring 16. Therefore, when opening the valve from the closed state, it is necessary to energize the solenoid 7 and pull the plunger 13 against the restoring force of the spring 16, which requires a large driving voltage.

However, in general, a battery built in a flow meter such as a gas meter has a voltage of about 3 V, and the battery is considerably consumed. Therefore, measures such as weakening the spring 16 and shortening the stroke of the plunger 13 are taken so that the solenoid 7 can be driven with a low voltage. However, if the spring 16 is weakened, the pressing force against the valve body 15 at the time of closing the valve is weak, so that reliability is deteriorated such that gas leakage occurs due to the assembly tolerance of the shutoff valve. Therefore, subtle adjustments such as selection of the material and thickness of the spring 16 are required.

Further, if the stroke of the plunger 13 is shortened, the pressure loss increases. Therefore, in order to compensate for the pressure loss, the diameter of the flow port 4 has to be increased, and the diameter of the valve element 15 also increases, resulting in poor valve closing stability at the time of valve closing.

Further, since the conventional gas flow passage 3 is bent at a right angle, the pressure loss is large, and the valve body 15 moves forward and backward with respect to the valve seat 5 having the flow port 4. There is a problem that the shut-off valve becomes large, and a flow meter such as a gas meter having a built-in shut-off valve inevitably becomes large.

The present invention has been made in view of the above circumstances. An object of the present invention is to smoothly open and close a valve even at a low voltage and to reduce the pressure loss. It is to provide a shutoff valve that is structurally simple and can be downsized.

[0014]

In order to achieve the above-mentioned object, the present invention provides a casing, an inlet port at one end side,
A straight flow passage having an outlet on the other end side was provided, and the main valve seat was provided along the edge of the flow passage, and was rotatably provided in the plane facing the main valve seat and perpendicular to the flow passage. Provide a main valve. Further, a sub-flow passage communicating with the flow passage is provided in the center of the main valve, and a pilot valve seat is provided along the edge of the sub-flow passage.

A supporting shaft is provided in the sub-flow passage so as to pass through the sub-flow passage and has a stopper along the direction of the flow passage, and a pilot valve that opens and closes the sub-flow passage is opposed to the support shaft and faces the pilot valve seat. Freely and axially moveable,
The pilot valve is provided with a rotating body which is supported by a joint shaft projecting from the main valve, rotates integrally with the main valve, and whose movement amount in the flow passage direction is restricted by the joint shaft.

Further, the rotating body is provided with at least a pair of permanent magnets having different poles symmetrically arranged about the supporting shaft center, and both ends of the casing are opposed to the permanent magnets on the outlet side of the casing. The main body and the pilot valve are closed by the attraction force of the permanent magnet when the power is off, and the main body and the pilot valve are closed when the power is on, and the rotor is separated by the magnetic force that repels the permanent magnet. This is because the pilot valve was opened by the body and then the electromagnet was installed to float and rotate the main valve.

[0017]

[Operation] When the electromagnet is not energized, the rotor is attracted by the attraction force of the permanent magnet, the main valve is attracted to the main valve seat, and the pilot valve is attracted to the pilot valve seat, so the flow passage is blocked. However, when the electromagnet is energized, the rotating body separates due to the magnetic force that repels the permanent magnet, and the rotating body first separates the pilot valve from the pilot valve seat to open the auxiliary flow passage.

As a result, the pressure difference between the primary pressure on the inlet side and the secondary pressure on the outlet side is reduced. Further, the main body is separated from the main valve seat by the rotary body, and the main body is floated, the rotary body rotates integrally with the main valve, and rotates by a predetermined rotation angle so that the communication port of the main valve faces the outlet. In this state, the attraction force of the permanent magnet attracts the rotating body to hold the main valve closed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 6, the casing 21 of the shutoff valve 20 is formed of, for example, a metal material in a cylindrical shape with a head, the lower portion of which is formed in the opening 21a and the upper portion of which is formed in the closed portion 21b. ing. The opening 21a is provided with an inflow port 22 for a fluid such as gas, and the closing part 21b is provided with a semicircular outflow port 23 on one side of the axial center part 21c of the casing 21. A straight flow passage 24 is formed inside the casing 21.

The outlet 2 is provided on the lower surface of the closing portion 21b.
A main valve seat 25 is provided along the mouth edge of No. 3, and an arcuate guide groove 26 is also formed on the lower surface of the closing portion 21b on the side opposite to the outlet 23.

Further, a supporting shaft 27 projecting inside the casing 21 is projectingly provided at an axial center portion 21c of the casing 21, and a stopper 28 is provided at a tip end portion thereof. A disk-shaped main valve 29 is provided on the support shaft 27 so as to be rotatable and movable toward and away from the main valve seat 25, and a communication port 29a corresponding to the outlet 23 is provided. ing.

A rubber seal 30 is attached on the upper surface of the main valve 29, that is, on the side facing the main valve seat 25, and the rubber seal 30 is formed so as to be in close contact with the main valve seat 25 for reliable sealing when the valve is closed. There is. The flow passage 2 is provided in the center of the main valve 29.
4, a sub-flow passage 31 communicating with the sub-flow passage 3 is provided.
The support shaft 27 penetrates through 1. further. A pilot valve seat 32 is provided on the lower surface of the main valve 29 along the edge of the auxiliary flow passage 31.

Further, a stopper pin 29b projecting upward is provided at a part of the outer peripheral edge of the main valve 29, which is inserted into the guide groove 26 of the casing 21 to regulate the rotation angle of the main valve 29. There is.

A pilot valve 33 is provided below the main valve 29 so as to be rotatable with respect to the support shaft 27 and movable toward and away from the pilot valve seat 32. The pilot valve 33 has a spool shape, and an upper flange portion 35 is provided at one end of a tubular portion 34 and a lower flange portion 36 is provided at the other end.

A fitting hole 37 is formed at the center of the upper flange portion 35. The fitting hole 37 has a diameter larger than that of the support shaft 27 and is rotatably and axially movable, but has a diameter smaller than that of the stopper 28, and the stopper 28 supports the pilot valve 33. .. Further, the upper flange portion 35 of the pilot valve 33
A rubber seal 38 is adhered to the upper surface of the pilot valve seat 32, that is, on the side facing the pilot valve seat 32, and the rubber seal 38 is formed so as to be in close contact with the pilot valve seat 32 for reliable sealing when the valve is closed.

The cylindrical portion 34 of the pilot valve 33 is fitted with a fitting hole 41 formed at the center of a disk-shaped rotating body 40, and is supported movably in the axial direction with respect to the cylindrical portion 34. At the same time, the rotor 40 has a communication port 2 for the main valve 29.
A communication port 40a corresponding to 9a is provided.

A concave portion 42 having a diameter larger than that of the upper flange portion 35 of the pilot valve 33 is formed on the peripheral portion of the fitting hole 41 of the rotating body 40.
Is provided and within the range of the gap 43, the pilot valve 33
The rotating body 40 is relatively movable up and down.

Further, a pair of through holes 44, 44 are formed in the outer peripheral edge of the rotating body 40 symmetrically with respect to the central portion 40b, and these through holes 44, 44 project downward from the main valve 29. It is fitted to the joint shafts 45, 45 provided. A collar portion 45 a having a diameter larger than that of the through hole 44 is provided at the lower end portions of the joint shafts 45, 45.

Therefore, the central portion of the rotating body 40 is supported by the lower flange portion 36 of the pilot valve 33,
The peripheral portion is supported by the flange portion 45 a of the joint shaft 45.

On the lower surface of the rotating body 40, between the fitting hole 41 and the through holes 44, 44 are permanent magnet mounting holes 46, 46.
Is provided. And these permanent magnet mounting holes 4
6 and 46 are provided with permanent magnets 47 and 47 in which different poles are symmetrically arranged around the center portion 40b.

On the other hand, the closed portion 21b of the casing 21
In the radial direction passing through the central portion 21c.
Has been drilled. A rod-shaped iron core 49 and a coil 50 wound around the iron core 49 are provided in the electromagnet mounting hole 48.
One rod-shaped electromagnet 51 consisting of and is inserted and fixed. Both ends of the electromagnet 51 are connected to the permanent magnet 4
It faces 7,47.

The coil 50 of the electromagnet 51 is electrically connected via a lead wire 52 to a battery (not shown) as a power source and a control device (not shown) such as a seismic sensor or a gas leak alarm. .. Next, the operation of the shutoff valve 20 configured as described above will be described.

First, when the electromagnet 51 is not energized, the outlet 23 of the casing 21 and the communication port 2 of the main valve 29 are connected.
9a is 180 ° out of phase with the permanent magnet 4
7, 47 are opposed to both ends of the electromagnet 51.

Accordingly, the attraction force of the permanent magnets 47, 47 attracts the iron core 49 of the electromagnet 51, and the rotating body 40 is pulled up by the electromagnet 51. Rotating body 40
Is pulled up, the upper flange portion 35 of the pilot valve 33 fitted into the recessed portion 42 is also pulled up, the rubber seal 38 is adsorbed to the pilot valve seat 32, and the main valve 29 passes through the rubber seal 30. It is adsorbed to the valve seat 25, and the outlet 23 is held closed by the main valve 29, and the auxiliary flow passage 31 is held closed by the pilot valve seat 32. (See Figure 5)

In this case, fluid pressure such as gas pressure is applied to the main valve 29 from the inflow port 22 of the flow passage 24, but since it is applied in the valve closing direction, the sealing property is further increased and a reliable valve closed state can be maintained.

From this state, an operation signal is input to the shutoff valve 20, and the electromagnet 51 is repulsed from the permanent magnets 47, 47.
When the magnet is energized, the permanent magnets 47, 47 and the electromagnet 51 repel each other, and this repulsive force acts in a direction of floating (pushing down) the rotating body 40 from the closed portion 21b of the casing 21.

Therefore, the edge of the fitting hole 41 of the rotating body 40 contacts the lower flange portion 36 of the pilot valve 33, and the pilot valve 33 is pushed down. Therefore, the pilot valve 33 is separated from the pilot valve seat 32 and is separated from the auxiliary flow passage 3
1 is in communication with the flow passage 24.

Immediately after the pilot valve 33 is separated from the pilot valve seat 32, the rim of the through hole 44 of the rotating body 40 contacts the flange portion 45a of the joint shaft 45, and the joint shaft 45
To push down the rotating body 4 via the joint shaft 45.
0 and the main valve 29 are connected, and the main valve 29 is pushed down integrally with the rotating body 40. Therefore, the main valve 29 is separated from the main valve seat 25, and the outflow port 23 is in communication.

When the rotating body 40 and the main valve 29 are levitated by the electromagnet 51, a vector that tries to move in the outer peripheral direction is generated, and the rotating body 40 and the main valve 29 rotate about the main shaft 27. When the permanent magnets 47, 47 and both ends of the electromagnet 51 are displaced, the magnetic repulsive force weakens, but the permanent magnets 47, 47 are now attracted to the other end of the electromagnet 51.

When the rotary body 40 and the main valve 29 rotate 180 °, the permanent magnets 47, 47 and the electromagnet 51 are brought into a state of attracting each other, the rotary motion of the rotary body 40 and the main valve 29 is stopped, and the valve body 29 is casing. It is adsorbed to the closed portion 21b of 21.

That is, the valve body 29 rotates 180 °, the outlet 23 of the casing 21 and the communication port 29a of the main valve 29 face each other, and the valve is opened. In this state, the energization of the electromagnet 51 is stopped. Also, the permanent magnets 47, 47 attract the iron core 49 of the electromagnet 51, and the main valve 29 is attracted to the casing 21 together with the rotating body 40. (See Figure 1)

When the shutoff valve 20 is opened, the inlet 2
Since the fluid flowing in from 2 passes through the straight flow passage 24 inside the casing 21 toward the outlet 23, the pressure loss due to the shutoff valve 20 is negligibly small.

In this state, an operation signal is input to the shutoff valve 20 from a control device such as a vibration sensor or a gas leak alarm,
When the electromagnet 51 is energized so as to repel the permanent magnets 47, 47, the permanent magnets 47, 47 and the electromagnet 51 repel, and the repulsive force causes the main valve 29 to float above the casing 21. A vector force is generated in the pulling direction and the rotating direction of the main valve 29 of the electromagnet 51, and the main valve 29 rotates about the support shaft 27.

Then, the permanent magnets 47, 47 are attracted to the other end of the electromagnet 51 this time, and the rotor 40 and the main valve 29.
When rotated by 180 °, the permanent magnets 47, 47 and the electromagnet 5
1, the rotary body 40 and the main valve 29 stop rotating, and the main valve 29 is attracted to the main valve seat 25. That is, the main valve 29 rotates 180 ° and the outlet 23 and the main valve 29 rotate.
When the communication port 29a of is out of phase, the valve is closed,
Even if the power supply to the electromagnet 51 is stopped in this state, the permanent magnet 4
7, 47 attract the iron core 49 of the electromagnet 51, and the main valve 29
Is adsorbed to the main valve seat 25.

By momentarily energizing and exciting the electromagnet 51 in this way, the main valve 29 can be rotated to open and close the valve. In the open and closed states, the permanent magnet 47,
The suction force of 47 allows the main valve 29 to be suction-held on the main valve seat 25.

[0047]

As described above, according to the present invention, when the electromagnet is not energized, the attracting force of the permanent magnet attracts the rotating body so that the main valve is attracted to the main valve seat and the pilot valve is the pilot valve. The flow passage is blocked because it is adsorbed on the valve seat, but when the electromagnet is energized, the rotating body separates due to the magnetic force that repels the permanent magnet, and this rotating body first separates the pilot valve from the pilot valve seat. To open the secondary flow passage.

As a result, the pressure difference between the primary pressure on the inlet side and the secondary pressure on the outlet side is reduced. Further, the main body is separated from the main valve seat by the rotary body, and the main body is floated, the rotary body rotates integrally with the main valve, and rotates by a predetermined rotation angle so that the communication port of the main valve faces the outlet. In this state, the attraction force of the permanent magnet attracts the rotating body to hold the main valve closed.

Therefore, the opening and closing of the valve is smooth, and the reliability can be stably improved in both the opened and closed states. Further, since a spring is not used, it can be operated at a low voltage, the battery consumption is small, and stable operation can be expected over a long period of time. Moreover, by providing the casing with a straight flow passage having an inflow port on one end side and an outflow port on the other end side, there is an effect that the pressure loss is small.

Further, by arranging one electromagnet in the lateral direction, the magnetic efficiency is high, the height dimension is small, the size can be reduced, 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 according to an embodiment of the present invention in an open state.

FIG. 2 is a bottom view of the casing of the embodiment.

FIG. 3 is a bottom view of the main valve of the embodiment.

FIG. 4 is a top view of the casing according to the embodiment.

FIG. 5 is a vertical cross-sectional side view of the shutoff valve of the embodiment in a closed state.

FIG. 6 is a bottom view of the rotating body according to the embodiment.

FIG. 7 is a vertical sectional side view of a conventional shutoff valve.

[Explanation of symbols]

21 ... Casing, 22 ... Inflow port, 23 ... Outflow port, 24
... Flow passage, 25 ... Main valve seat, 27 ... Main shaft, 28 ... Stopper, 29 ... Main valve, 29a ... Communication port, 31 ... Sub flow passage, 3
2 ... Pilot valve seat, 33 ... Pilot valve, 40 ... Rotating body, 40a ... Communication port, 45 ... Joint shaft, 47 ... Permanent magnet, 51 ... Electromagnet.

Claims (1)

[Claims] 1. A casing, a straight flow passage which is provided in the casing and has an inlet on one end side and an outlet on the other end side, and a main valve seat provided along an edge of the flow passage. A main valve that is rotatably provided in a plane that is opposed to the main valve seat and is orthogonal to the flow passage and that opens and closes the flow passage; and a sub-flow passage that is provided at the center of the main valve and that communicates with the flow passage A pilot valve seat provided along an edge of the sub-flow passage, a support shaft having a stopper provided along the flow passage direction and penetrating the sub-flow passage; A pilot valve movably fitted in the axial direction and facing the pilot valve seat to open and close the auxiliary flow passage, and a main valve fitted to the pilot valve and supported by a joint shaft protruding from the main valve. It rotates together with the joint shaft and the flow path And a pair of permanent magnets having different poles symmetrically provided on the rotating body about the supporting shaft center, and both ends on the outlet side of the casing. It is provided so as to face the permanent magnet, and attracts the rotating body by the attraction force of the permanent magnet to close the main valve and the pilot valve when there is no energization, and when the energization energizes the rotating body by the magnetic force repelling the permanent magnet. A shut-off valve comprising: an electromagnet that separates and opens the pilot valve by the rotating body, and then causes the main valve to float and rotate.