JP2886959B2 - Shut-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention is incorporated in a fluid flow meter, for example, a gas meter, and shuts off gas flow in the event of an earthquake, gas leak, or other emergency. It relates to a shutoff valve.

(Prior Art) A seismic sensor that detects an earthquake and a gas leak alarm that detects 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 configured 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 circumference of the bobbin 10, a permanent magnet 12 arranged coaxially on the upper side of the bobbin 10, and an anvil 14 for receiving a plunger 13 arranged below the center hole of the bobbin 10. A valve body 15 facing the valve seat 5 is provided at the upper end of the valve 13. 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, the spring 16
When the pressure is weakened, the pressing force against the valve body 15 at the time of closing the valve is weak, so that the reliability is inferior, for example, a gas leak occurs due to an assembly tolerance of the shutoff valve. 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, and aims to smoothly open and close a valve while having a low voltage, and a small pressure loss.
Another object of the present invention is to provide a shut-off valve which is structurally simple and can be reduced in size.

[Constitution of the Invention] (Means and Actions for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a casing, an inflow port provided on the casing at one end, and an outflow port at the other end. A straight flow passage having a valve body rotatably provided inside the casing in a plane perpendicular to the flow passage to open and close the flow passage; and a different pole around the rotation axis of the valve body. At least one pair of symmetrically provided permanent magnets, and both ends are provided on the outlet side of the casing so as to face the permanent magnets, and when no power is supplied, the valve body is pulled out by the attraction force of the permanent magnets. A rod-shaped electromagnet that attracts to the side and closes the flow passage, and when energized, causes the valve body to float and rotate by the magnetic force repelled by the permanent magnet to open the flow passage. To That.

When the electromagnet is not energized, the valve body is attracted to the outlet side of the casing by the attraction force of the permanent magnet, and the flow passage is closed. When the electromagnet is energized, the valve body floats and rotates by the magnetic force repelling the permanent magnet, and the valve body opens the flow passage.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the casing of the shutoff valve 20 is shown in FIG.
21 is a lower case 22 made of, for example, a metal material, and an upper case
23. The lower case 22 has a disk shape, and a flange 24 is provided on the outer peripheral edge of the lower end. And
Outside the lower case 22 is an upper case 23 having a headed cylindrical shape.
Are fitted, and the space between them is sealed by an O-ring 21a. A flange 23a is provided on the outer peripheral edge of the lower end of the upper case 23 so as to overlap the flange 24. A semicircular outlet 25 is formed on one side of the lower case 22 around the axis 22a. Further, an electromagnet mounting hole 26 is formed in a radial direction passing through the axial center portion 22a of the lower case 22. And this electromagnet mounting hole 26
A rod-shaped electromagnet 29 composed of a rod-shaped iron core 27 and a coil 28 wound around the iron core 27 is inserted and fixed in the rod. Further, a semicircular inlet 30 facing the outlet 25 of the lower case 22 is formed in the upper case 23, and one end of the upper case 23 is connected to the inlet 30 and the other end is connected to the outlet 25. Straight flow passages 31 communicating with each other are formed.

Further, a valve body 32 rotatably supported by the lower case 22 and the upper case 23 is provided inside the casing 21. That is, the valve body 32 is rotatable in a plane perpendicular to the flow passage 31, and the valve body 32 is rotatably fitted with a center hole to a support shaft 34 protruding from the lower case 22. Is formed. Further, the upper end of the support shaft 34 is supported by a shaft support 36 provided on the inner surface of the upper case 23. The valve body 32
A semicircular communication port 35 capable of facing the outlet 25 and the inlet 30 is formed on one side of the center hole of the center hole, and permanent magnet mounting holes are provided at both ends of the communication port 35.
37, 37 are provided. In the permanent magnet mounting holes 37, 37, different poles are symmetrically arranged around the support shaft 34, and the permanent magnets 3 facing both ends of the electromagnet 29 are arranged.
8, 38 are provided.

Further, a seal rubber film 39 is adhered to the lower surface of the valve body 32, that is, the surface facing the lower case 22, and when the valve body 32 is attracted to the lower case 22 by the magnetic attraction force of the permanent magnets 38, 38. The outlet 25 is shut off (valve closed) in close contact with the valve.

The shut-off valve 20 configured as described above is mounted inside a flow meter or the like, as shown in FIGS. That is, reference numeral 40 denotes a partition wall that partitions the upstream side 41a and the downstream side 41b of the fluid passage 41, and the partition wall 40 is provided with a mounting hole. This mounting hole 42 has a shut-off valve via O-rings 43
The inflow port 30 of the shutoff valve 20 is open on the upstream side 41a of the fluid passage 41, and the outflow port 25 is open on the downstream side 41b thereof. The coil 28 of the electromagnet 29 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 44.

Next, the operation of the shut-off valve 20 configured as described above will be described.

First, when the electromagnet 29 is not energized, the lower case 22
The permanent magnets 38, 38 face both ends of the electromagnet 29 in a state where the outflow port 25 of the valve body and the flow port 35 of the valve element 32 are out of phase by 180 °. Therefore, the attractive force of the permanent magnets 38, 38 attracts the iron core 27 of the electromagnet 29, and the valve body 32 is attracted to the lower case 22 via the sealing rubber film 39, and the outlet 25 is connected to the valve body.
32 keeps the valve closed. In this case, the flow passage
Fluid pressure such as gas pressure is applied to the valve body 32 from the inflow port 30 of the valve 31. However, since the fluid pressure is applied in the valve closing direction, the sealing performance is further increased and a reliable valve closing state can be maintained.

From this state, when an operation signal is input to the shut-off valve 20, and the electromagnet 29 is energized so as to repel the permanent magnets 38, 38, the permanent magnets 38, 38 and the electromagnet 29 repel, and this repulsive force is applied to the valve body.
A vector is generated that acts in the direction of floating from the lower case 22 and moves in the outer circumferential direction.
Rotates smoothly about the support shaft 34. When the valve element 32 rotates, the repulsive force between the permanent magnets 38, 38 and the electromagnet 29 weakens, but the permanent magnets 38, 38 are now attracted to the other end of the electromagnet 29. Then, when the valve element 32 rotates by 180 °, the permanent magnets 38, 38 and the electromagnet 29 are attracted, the rotation of the valve element 32 stops, and the valve element 32 is attracted to the lower case 22. In other words, the valve body 32 rotates 180 °, and the outlet 25 of the lower case 22 and the communication port 35 of the valve body 32 face each other, and the valve is opened. The magnets 38 attract the iron core 27 of the electromagnet 29, and the valve body 32 is attracted to the lower case 22. When the shutoff valve 20 is opened, the fluid flowing from the inflow port 30 flows into the straight flow passage 31 inside the casing 21.
To the outlet 25, the pressure loss due to the shutoff valve 20 is negligibly small.

In this state, an operation signal is input to the shut-off valve 20 from a control device such as a seismic sensor or a gas leak alarm, and the permanent magnet 38,
When the electromagnet 29 is energized so as to repel the 38, the permanent magnet
38, 38 and the electromagnet 29 rebound, and the repulsive force
32 floats from the lower case 22, and a vector force is generated in the direction in which the electromagnet 29 pushes up the valve body 32 and in the direction of rotation in the same manner as when the valve is opened, and the valve body 32 rotates about the support shaft. Then, the permanent magnets 38, 38 are now attracted to the other end of the electromagnet 29,
When the valve body 32 rotates 180 °, the permanent magnets 38 and 38 and the electromagnet 29
Are attracted, the rotational movement of the valve body 32 stops, and the valve body 32 is attracted to the lower case 22. In other words, the valve body 32 is rotated by 180 °, and the valve is closed when the outflow port 25 of the lower case 22 and the communication port 35 of the valve body 32 are out of phase with each other.
The permanent magnets 38, 38 remain the core of the electromagnet 29 even if the power supply to the
The valve body 32 is attracted to the lower case 22 by attracting to the lower case 22.

In this way, by instantaneously energizing and exciting the electromagnet 29, the valve body 32 can be opened and closed by rotating the valve body 32. In the open state and the closed state, the valve is operated by the attractive force of the permanent magnets 38, 38. The body 32 can be suction-held on the lower case 22.

[Effects of the Invention] As described above, according to the present invention, by instantaneously energizing and exciting the electromagnet, the valve body can be floated and rotated to open and close the valve. In the closed state, the valve body 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. Furthermore, since a spring is not used, the device can be operated at a low voltage, consumes little battery, and can be expected to operate stably for a long period of time. In addition, by providing the casing with a straight flow passage having an inflow port on one end and an outflow port on the other end, there is an effect that pressure loss is small.

Also, by arranging one electromagnet in the horizontal direction,
There is an effect that the magnetic efficiency is high, the height dimension is reduced, the size can be reduced, and the device can be provided at low cost.

[Brief description of the drawings]

1 to 5 show one embodiment of the present invention. FIG. 1 is a longitudinal side view of a shutoff valve, FIG. 2 is an exploded perspective view, and FIG.
FIGS. 4A to 4C are perspective views for explaining the operation, and FIG.
FIG. 5 is a plan view showing a state in which the shut-off valve is incorporated in the flow meter, FIG. 5 is a vertical side view of the same, and FIG. 6 is a vertical side view of a conventional shut-off valve. 21 ... Casing, 25 ... Outlet, 29 ... Electromagnet, 30 ...
... inlet, 31 ... flow passage, 32 ... valve, 38 ... permanent magnet.

──────────────────────────────────────────────────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 (1)

(57) [Claims] 1. A casing, a straight flow passage provided in the casing and having an inlet at one end and an outlet at the other end, and a rotatable inside the casing in a plane perpendicular to the flow passage. A valve body provided for opening and closing the flow passage, at least one pair of permanent magnets provided with different poles symmetrically about the rotation axis of the valve body, and both ends on the outlet side of the casing. The valve body is provided opposite to the permanent magnet, and when no power is supplied, the valve element is attracted to the outlet side of the casing by the attraction force of the permanent magnet to close the flow passage,
A shut-off valve comprising: a single rod-shaped electromagnet that floats and rotates a valve body by a magnetic force repelled by the permanent magnet when energized to open the flow passage.