JP2886975B2 - Shut-off valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off valve that is incorporated in a fluid flow meter, for example, a gas meter, and that shuts off the flow of gas in the event of an earthquake, gas leak, or other emergency.

[Prior Art] A seismic sensor for detecting an earthquake and a gas leak alarm for detecting a gas leak are known. In addition, safety devices that combine these seismic sensors or gas leak alarms with shut-off valves and operate the shut-off valve to shut off gas flow during seismic or gas leaks have been put into practical use. I have.

For example, JP-A-64-6578 and JP-A-64-6580 describe solenoid type shut-off valves, in which a valve body facing a flow port is normally urged in a valve closing direction by a spring. However, when the self-holding solenoid is not energized, it overcomes the spring and is attracted to the magnet, and the valve element is separated from the valve seat and is in the open state. When a reverse magnetic field is applied by instantaneously energizing the coil of the self-holding solenoid, the valve body is pressed against the valve seat by the restoring force of the spring and the valve is closed. That is, when an operation signal is input to the self-holding solenoid from the seismic sensor or the gas leak alarm that detects gas leak, the shutoff valve is operated to shut off the gas flow.

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

The shut-off valve unit 6 will be described. Reference numeral 7 denotes a two-way solenoid, the internal structure of which is a yoke 9 connected to a flange 8 and an inner periphery of the yoke 9.
A coil 11 wound around the outer periphery of the bobbin 10, a permanent magnet 12 arranged coaxially on the upper side of the bobbin 10, and an anvil 14 arranged below the center hole of the bobbin 10 and receiving the plunger 13. At the upper end of the valve body facing the valve seat 5
15 are provided. Further, a spring 16 for urging 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 not energized, the spring 16 is overcome and the plunger 13 is attracted to the permanent magnet 12,
The valve element 15 is separated from the valve seat 5 and is in an open state. And
When a reverse magnetic field is applied by momentarily energizing the coil 11 of the solenoid 7 and the restoring force of the spring 16, the valve body 15 moves the valve seat 5.
To close the valve.

When the valve 15 in the closed state is opened again, the solenoid 7 is energized to pull the plunger 13 against the restoring force of the spring 16.

[Problems to be Solved by the Invention] However, the shut-off valve configured as described above urges the valve body 15 in the valve closing direction by the restoring force of the spring 16,
When a reverse magnetic field is applied by energizing the coil 11 of the solenoid 7,
The valve body 15 is pressed against the valve seat 5 by the restoring force of the spring 16 and is closed. Therefore, when opening the valve from the closed state, it is necessary to energize the solenoid 7 to retract the plunger 13 against the restoring force of the spring 16, and a large driving voltage is required.

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 significantly 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 at a low voltage. However, if the spring 16 is weakened, the pressing force against the valve body 15 when the valve is closed is weak, so that reliability such as gas leakage due to assembly tolerance of the shutoff valve is deteriorated. Therefore, fine adjustment such as selection of the material and thickness of the spring 16 is required.

Further, when the stroke of the plunger 13 is shortened, the pressure loss increases. Therefore, to compensate for pressure loss,
The diameter of the flow opening 4 must be increased, and the diameter of the valve body 15 also increases, resulting in poor valve closing stability when the valve is closed.

Further, since the conventional gas flow passage 3 is bent at a right angle, the pressure loss is large, and since the valve element 15 moves forward and backward with respect to the valve seat 5 having the flow opening 4, the shut-off valve is not used. There is a problem that the size becomes large and a flow meter such as a gas meter having a built-in shut-off valve necessarily becomes large.

The present invention has been made in view of the above circumstances. It is an object of the present invention to smoothly open and close a valve at a low voltage and to apply the same pressure to a valve body at all times. It is an object of the present invention to provide a shut-off valve which is well balanced and operates to open and close stably even with pressure fluctuations.

[Means for Solving the Problems] A first aspect of the present invention is directed to a casing having a pair of partition walls facing each other separated from each other and facing the primary chamber, and a gap between the partition walls communicating with the secondary chamber. First and second flow passages for communicating the primary chamber and the secondary chamber are provided on the partition wall, and the first flow path is rotatably opposed to the secondary chamber in a plane perpendicular to the first flow path. And a first valve body for opening and closing the
A second valve body is provided in the primary chamber integrally with the first valve body, rotatably opposed in a plane perpendicular to the second flow passage, and opening and closing the second flow passage. In addition, the first or second
While at least one of the valve bodies is provided with at least a pair of permanent magnets provided with different polarities symmetrically about this rotation axis, both ends of the casing are provided so as to face the permanent magnets. A bar-shaped electromagnet is provided.

Claim 2 communicates the primary chamber and the secondary chamber to a partition wall of a casing in which the outside of a pair of partition walls opposed to each other and separates from each other communicates with the primary chamber, and the partition wall of the casing communicates with the secondary chamber. First and second flow passages are provided, and a first valve body rotatably opposed to the primary flow passage in a plane perpendicular to the first flow passage and opening and closing the first flow passage is provided in the primary chamber, A second valve, which is integrated with the first valve element and is installed in the secondary chamber and rotatably faces the second flow passage in a plane perpendicular to the second flow passage and opens and closes the second flow passage.
Is provided. Furthermore, at least one of the first and second valve bodies is provided with at least one pair of permanent magnets provided with different polarities symmetrically about the rotation axis.
A rod-shaped electromagnet whose both ends are opposed to the permanent magnet is provided in a part of the casing.

[Operation] In the above configuration, when the electromagnet is de-energized, the electromagnet is attracted to the partition wall by the attraction force of the permanent magnet, and the first valve body is in the first flow passage, and the second valve body is in the second flow path. Close the flow passage,
When energized, the first magnet is repelled by a magnetic force that repels the permanent magnet.
And rotating the second valve body away from the valve seat and opening the first and second flow passages.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment. The casing 21 of the shut-off valve 20 includes a cylindrical case 22, a bottom plate 23 for closing a lower end opening of the case 22, and an upper partition wall 24 for closing an upper end opening of the case 22. The bottom plate 23 and the upper partition wall 24 are sealed to the case 22 by an O-ring 25. Further, an intermediate partition wall 25 that is separated from the bottom plate 23 and the upper partition wall 24 is integrally provided inside the case 22.

The upper partition wall 24 is connected to a fluid inflow cylinder 27 for gas or the like, and the inside thereof is formed in a primary chamber 28. The primary chamber 28 penetrates through the side wall of the case 22 and the intermediate partition wall 26. It communicates between the bottom plate 23 and the intermediate partition wall 26 through the opening 29. Further, a space between the upper partition wall 24 and the intermediate partition wall 26 is formed in a secondary side chamber 30, which communicates with an outlet 31 provided on the side wall of the case 22.

A semicircular first flow passage 32 is formed in the upper partition wall 24 located on one side of the axis 22a of the case 22 as a center, and a half-circular first flow passage 32 is formed in the upper partition wall 24. A circular second flow passage 33 is provided. The primary chamber 28 and the secondary chamber 30 communicate with each other through first and second flow passages 32 and 33. Further, a valve seat 34 formed integrally with the upper partition wall 24 is provided on the secondary chamber 30 side of the first flow passage 32, and an intermediate partition wall is formed on the primary chamber 28 side of the second flow passage 33. A valve seat 35 formed integrally with 26 is provided.

A bearing hole 36 is provided in the intermediate partition wall 26 located at the shaft portion 22a of the case 22. A rotating shaft 37 is inserted into the bearing hole 36 so as to rotate and move in the axial direction. One end of the rotating shaft 37 protrudes into the secondary chamber 30, a disc-shaped first valve body 38 is fixed to one end thereof, and the other end protrudes into the primary chamber 28. Is fixed to a second valve body 39 having a disc shape. That is, the first and second valve bodies 3
8, 39 are rotatable in a plane perpendicular to the first and second flow passages 32, 33. Further, rubber sheets 40, 40 are adhered to the semicircular portions of the surfaces of the first and second valve bodies 38, 39 which contact the valve seats 34, 35, and the first and second valve bodies 38, 39 have the first and the second semicircular portions. Second
Semicircular communication ports 38a, 39a capable of facing the flow passages 32, 33 are formed.

Magnet mounting portions 41, 41 are provided at both ends passing through the center of the first valve body 38. The magnet mounting portions 41 are provided with permanent magnets 42 in which different poles are arranged symmetrically about the rotation shaft 37. The upper partition wall 24 adjacent to the first valve body 38 includes an axial center portion of the case 22.
An electromagnet mounting hole 43 is formed in the radial direction passing through 22a. One rod-shaped electromagnet 46 composed of a rod-shaped iron core 44 and a coil 45 wound around the iron core 44 is inserted and fixed in the electromagnet mounting hole 43. The coil 45 of the electromagnet 46 is electrically connected to a battery (not shown) as a power source and control devices (not shown) such as a seismic sensor and a gas leak alarm via a lead wire 47.

Next, the operation of the shut-off valve 20 configured as described above will be described with reference to FIGS. 3 (a), (b) and (c).

First, when the electromagnet 46 is not energized, the first flow passage 32 and the communication port 38a of the first valve body 38 face each other, as shown in FIG. And the communication port 39a of the second valve body 39 are opposed to each other. Therefore, the fluid in the primary chamber 28 flows into the secondary chamber 30 through the circulation ports 38a and 39a, and flows out from the outlet 31 of the case 22. At this time, the permanent magnets 42, 42
Are opposed to both ends of the electromagnet 46. Therefore, the attractive force of the permanent magnets 42 and 42 attracts the iron core 44 of the electromagnet 46, and the first valve body 38 is connected to the upper partition wall 24 and to the second
The valve element 39 is fixedly held by the intermediate partition wall 26.

When an operation signal is input to the shut-off valve 20 from this state and the electromagnet 46 is energized so as to repel the permanent magnets 42, 42, the permanent magnets 42, 42 and the electromagnet 46 repel, and the repulsive force is the first force.
Act in a direction away from the upper partition wall 24.
That is, since the first valve body 38 moves downward in the drawing, the second valve body 39 connected by the rotating shaft 37 also acts in a direction away from the intermediate partition wall 26.

The first and second valve bodies 38, 39 act in a direction away from the partition walls 24, 26, and at the same time, a vector is generated to move in the outer peripheral direction, as shown in FIG. 3 (b). ,
The first and second valve bodies 38, 39 rotate smoothly about the rotation shaft 37. When the first valve body 38 rotates, the repulsive force between the permanent magnets 42, 42 and the electromagnet 46 weakens, but the permanent magnets 42, 42
42 is now attracted to the other end of electromagnet 46.

Then, as shown in FIG. 3 (c), the first valve body 38
Is rotated by 180 °, the second valve body 39 also rotates integrally,
The state where the permanent magnets 42, 42 and the electromagnet 46 are attracted,
The rotation of the valve body 38 stops, the first valve body 38 is attracted to the upper partition wall 24, and the second valve body 39 is attached to the intermediate partition wall 26.
Adsorb to. That is, the first valve body 38 rotates 180 ° to face the first flow passage 32, and the second valve body 39
And the valve is closed. In this state, even if the energization of the electromagnet 46 is stopped, the permanent magnets 42 and 42 attract the iron core 44 of the electromagnet 46, and the first valve body 38 is attracted to the valve seat 34, and the second valve body 39
Adsorbs on the valve seat 35.

At this time, the fluid pressure of the primary chamber 28 acts on the first valve body 38 in the valve opening direction, while the fluid pressure of the primary chamber 28 acts on the second valve body 39 in the valve closing direction. Working. Moreover, since the first and second valve bodies 38, 39 are connected by the rotating shaft 37, the same pressure is always applied to the first and second valve bodies 38, 39 so that they are balanced. Therefore, even in a fluid such as LP gas in which the pressure fluctuation in the primary chamber 28 is large, the valve closing state is reliably maintained, and the first and second valve bodies 38, 39 are connected to the respective partition walls 24, The magnetic repulsive force acting in the direction away from 26 may be small.

By instantaneously energizing and exciting the electromagnet 46 in this manner, the first valve body 38 and the second valve body 39 can be integrally rotated to open and close the valve. In this case, the first valve body 38 can be suction-held on the upper partition wall 24 by the suction force of the permanent magnets 42, 42.

FIG. 4 shows a second embodiment. The basic structure is the same as that of the first embodiment, but an inlet 50 is provided on the side wall of the case 22. A primary chamber 51 is provided between the upper partition wall 24 and the intermediate partition wall 26, and a secondary chamber 52 is provided between the bottom plate 23 and the intermediate partition wall 26 and outside the upper partition wall 24. I have. Therefore, the fluid flowing from the primary chamber 51 is supplied to the first flow passage 32 provided in the upper partition wall 24 and the intermediate partition wall.
It flows out to the secondary side chamber 52 through the second flow passage 33 provided in the 26. Also in such a configuration, in the valve closed state, the fluid pressure of the primary chamber 51 acts on the first valve body 38 in the valve closing direction, but at the same time, the second valve body 39 1
The fluid pressure in the secondary chamber 51 acts in the valve opening direction. Moreover,
Since the first and second valve bodies 38, 39 are connected by the rotating shaft 37, the same pressure is always applied to the first and second valve bodies 38, 39 so that they are balanced. Therefore, even in a fluid such as LP gas, in which the primary side chamber 51 has a large pressure fluctuation, the valve closing state is reliably maintained, and the first and second valve bodies 38, 39 are connected to the respective partition walls 24, The magnetic repulsive force acting in the direction away from 26 may be small.

[Effects of the Invention] As described above, according to the present invention, the first valve body is separated from the valve seat by instantaneously energizing and exciting the electromagnet, and the second valve is integrally formed with the first valve body. The valve body can be lifted and further rotated to open and close the valve, and in the valve open state and the valve closed state, both valve bodies can be held by the attraction force of the permanent magnet. Therefore, the valve opening / closing is smooth, and the reliability can be stably improved in any of the valve opening / closing states. Further, in the valve closed state, the primary fluid pressure acts on the first valve body in the valve closing direction, but at the same time, the primary fluid pressure opens on the second valve body. Acting in the valve direction, the same pressure is always applied to balance. Therefore, even in a fluid such as LP gas having a large primary-side pressure fluctuation, the valve-closing state is reliably maintained, and a small magnetic repulsive force acts on both valve bodies in a direction away from the valve seat when the valve is opened. This has the effect of ending.

Further, since a spring is not used, the operation can be performed at a low voltage, the consumption of the battery is small, and stable operation can be expected for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a shut-off valve according to a first embodiment of the present invention. FIG. 2 is a vertical side view of the shut-off valve in the embodiment. FIG. 3 is an exploded perspective view for explaining the operation of the shut-off valve in the embodiment. FIG. 4 is a vertical sectional front view of a shutoff valve according to a second embodiment of the present invention. FIG. 5 is a vertical side view of a conventional shut-off valve. 21 ... casing, 24 ... upper partition wall, 26 ... intermediate partition wall, 28 ... primary chamber, 30 ... secondary chamber, 32 ... first flow path, 33 ... second flow path , 37 ... rotating shaft, 38 ... first
, A second valve element, a permanent magnet, and an electromagnet.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-299379 (JP, A) JP-A-63-285378 (JP, A) JP-A-1-283483 (JP, A) JP-A 57- 124173 (JP, A) Japanese Utility Model 1-20580 (JP, U) Japanese Patent Publication No. 49-21690 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 31/00-31 / 11 F16K 3/00-3/36

Claims (2)

(57) [Claims] A pair of partition walls facing each other and separated from each other;
The outside of these partitions is the primary side chamber, and the space between the partitions is 2
A casing connected to the secondary chamber, and a first provided opposite to the partition wall and communicating between the primary chamber and the secondary chamber.
A first valve element installed in a secondary chamber of the casing, rotatably opposed in a plane perpendicular to the first flow path, and opening and closing the first flow path; This first
A second valve body that is integrated with the valve body and is installed in the primary chamber of the casing, rotatably faces in a plane perpendicular to the second flow path, and opens and closes the second flow path; At least one pair of permanent magnets provided with at least one of the first and second valve bodies symmetrically having different polarities around the rotation axis, and both ends provided in a part of the casing and having both ends provided with the permanent magnets. The first valve body closes the first flow passage and the second valve body closes the second flow passage when the power is not supplied to the partition wall. And a rod-shaped electromagnet for rotating the first and second valve bodies away from the valve seat and rotating the first and second valve bodies by a magnetic force repelled by the permanent magnet when energized to open the first and second flow passages. A shut-off valve characterized by the above-mentioned. A pair of partition walls facing each other,
The space between these partitions is the primary side chamber, and the outside of the partition is 2
A casing connected to the secondary chamber, and a first provided opposite to the partition wall and communicating between the primary chamber and the secondary chamber.
A first valve element installed in the primary chamber of the casing, rotatably opposed in a plane perpendicular to the first flow path, and opening and closing the first flow path; This first
A second valve body that is integrated with the valve body and is installed in the secondary chamber of the casing, rotatably opposed in a plane perpendicular to the second flow path, and opens and closes the second flow path; At least one pair of permanent magnets provided with at least one of the first and second valve bodies symmetrically having different polarities around the rotation axis, and both ends provided in a part of the casing and having both ends provided with the permanent magnets. The first valve body closes the first flow passage and the second valve body closes the second flow passage when the power is not supplied to the partition wall. And a rod-shaped electromagnet for rotating the first and second valve bodies away from the valve seat and rotating the first and second valve bodies by a magnetic force repelled by the permanent magnet when energized to open the first and second flow passages. A shut-off valve characterized by the above-mentioned.