JP2015169271A - Shutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive shutoff valve having a simple configuration.SOLUTION: A motor part includes: outer yokes 34, 35 mounting a stator 36 inside; a partition wall 37 formed at an opening edge of the outer yoke 34 so as to cover an opening part of the outer yoke 34; a mounting plate 46 formed integrally with the outer yoke 35 toward the outside of the outer yoke 35 at an opening edge of the outer yoke 35; a lid 40 disposed at an opening part of the outer yoke 35 and bonded to the mounting plate 46 air-tightly; and a rotor 43 which is disposed inside the stator 36 and in which a valve body 49 is mounted on a feed screw 42a formed at a rotary shaft 42.

Description

  The present invention relates to a shut-off valve using an electric motor as a driving means, and more particularly to a shut-off valve used as a shut-off mechanism of a gas shut-off device that prevents a gas accident in advance. The present invention relates to a shut-off valve mainly built in a gas meter or the like, which uses an electric motor that performs a shut-off return operation of the flow path by moving the valve body forward or backward with respect to the valve seat.

  In order to prevent gas accidents, various safety devices have been used in the past. Among them, a gas meter equipped with a battery-powered microcomputer (hereinafter abbreviated as microcomputer meter) is a safety, gas Popularization has been promoted due to the ease of piping, low price, etc., and in recent years it has become popular in almost all households. This microcomputer meter monitors the gas flow rate with a built-in flow sensor, and when it is judged that the gas usage status is abnormal use, or the sensor of an earthquake sensor, gas pressure sensor, gas alarm, carbon monoxide sensor, etc. When the situation is monitored and it is judged as a dangerous state, the gas is shut off by a shut-off valve built in the gas meter.

  In addition, the ratio of centralized monitoring micrometers that have a telemeter function that centrally monitors the gas flow rate information measured by the flow sensor using telephone lines or wireless communications has increased. Improvement of convenience is demanded. In this centralized monitoring type microcomputer meter or the like, a shut-off valve is provided so that the gas can be shut off and returned by a simple electric switch operation or a remote operation such as a telephone line or wireless communication. The shut-off valve is capable of shutting off and returning to gas by electric energy from the battery installed in the microcomputer meter, and holding the valve open and closed states does not require electric energy to prevent battery consumption. Is required.

  As the shut-off valve drive system, the one that used an electromagnetic solenoid has been the mainstream.However, in recent years, a relatively strong closing force and return force can be achieved when the valve is opened and closed. Attention has been focused on a shut-off valve that uses a PM type stepping motor that can maintain its state without requiring electrical energy as a drive source, and it has an airtight partition with the rotor inside the gas flow path and the stator outside the gas flow path. The shut-off valve has become mainstream because it can be easily attached to the gas flow path.

  Below, based on FIG. 4, the cutoff valve which uses a conventional stepping motor as a power source is demonstrated.

  As shown in FIG. 4, the conventional shut-off valve has two pairs of yokes 2 forming part of the magnetic circuit on the outer periphery, and each yoke has a built-in bobbin 4 around which a coil 3 for generating a magnetic field is wound. doing. Outer yokes 5 are disposed on the outer sides of the yokes 2 so as to be in contact with the end surfaces of the respective yokes. A flange 5a is formed on the outer yoke 5 toward the outer side. The outer yoke 5 forms a stator 6 together with two pairs of yokes. The partition wall 1 is fixed so as to keep one opening of the stator 6 airtight. A can 17 is disposed in a space surrounded by the stator 6 and the partition wall 1, and a cap 18 is disposed so as to close the open end of the can 17.

A rotor 12 composed of a magnet 10 and a shaft 11 is disposed in a space surrounded by the can 17 and the cap 18, and the rotor 12 is rotatably held by a pair of bearings 13 and 14. A lead screw 11 a is formed on the shaft 11, and the lead screw 11 a is screwed with a valve rubber receiver 16 that holds the valve rubber 15.

  An attachment plate 7 for attaching the shut-off valve to the gas meter is disposed so as to cover the end of the cap 18, and the attachment plate 7 is integrated by caulking the flange 5 a of the outer yoke 5.

  The outer yoke 5, the can 17, and the mounting plate 7 are held airtight by the seal member 8a, and the mounting plate 7 and the gas meter 9 as the mounted portion are held airtight by the seal member 8b, and the rotor A space between the outer periphery of 12 and the cap 18 is held airtight by a seal member 8c.

  The operation of the shut-off valve configured as described above will be described below with reference to FIG.

  When a predetermined pulse is applied to the two-phase coil 3, a rotating magnetic field is generated in the stator 6, and the rotor 12 rotates together with the rotating magnetic field, so that the valve rubber receiver screwed into the lead screw portion 11 a of the shaft 11. 15 moves to a valve seat (not shown) formed in the gas meter 9, and the valve rubber 14 comes into contact with the valve seat to close the fluid path and shut off the gas.

  On the other hand, when the rotor 12 rotates in the reverse direction, the valve rubber 14 is separated from the valve seat, thereby opening the fluid path and allowing gas to flow.

JP 2004-169879 A

  However, the conventional shut-off valve uses the can 17 to prevent gas leakage. However, since the can 17 is formed by deep drawing a metal having high corrosion resistance against gas, high processing accuracy is achieved. There is a problem that is necessary and expensive.

  The present invention solves the above-mentioned conventional problems, and an object thereof is to provide an inexpensive shut-off valve having a simple configuration.

  In order to solve the above-described conventional problems, the shut-off valve of the present invention includes a valve body configured to be able to contact a valve seat formed in a fluid chamber, and a motor unit that moves the valve body, and the motor The valve body is separated into a valve open state in which the valve body is separated from the valve seat and fluid can flow and a valve body is in contact with the valve seat and shuts off the fluid flow. In the shut-off valve to be held, the motor portion includes an outer yoke having a stator mounted therein, a partition wall formed at one opening edge of the outer yoke so as to cover one opening portion of the outer yoke, A mounting plate formed integrally with the outer yoke toward the outer side of the outer yoke at the other opening edge of the outer yoke, and disposed at the other opening of the outer yoke, so that the mounting plate is airtight Lid joined Is disposed inside the stator, the valve body feed screw formed on the rotary shaft is one that comprises a rotor mounted.

In the shut-off valve of the present invention, since the mounting plate is formed integrally with the outer yoke, the airtightness between the mounting plate and the outer yoke can be maintained with a simple configuration. Since the lid and the mounting plate are joined in an airtight manner, the airtightness between the lid and the mounting plate can be maintained. As a result, the fluid chamber side of the shutoff valve can be kept airtight.

Sectional drawing of the cutoff valve in Embodiment 1 of this invention Exploded perspective view of the shut-off valve The exploded perspective view of the motor part of the shut-off valve Cross-sectional view of a conventional shutoff valve

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

  A first invention includes a valve body configured to be able to contact a valve seat formed in a fluid chamber, and a motor unit that moves the valve body, and the valve body is moved by the motor unit. In the shut-off valve that is held in a valve-open state in which the fluid can flow away from the valve seat and a valve-closed state in which the valve body abuts the valve seat and shuts off the fluid flow, the motor unit includes: An outer yoke having a stator mounted therein, a partition wall formed at one opening edge of the outer yoke so as to cover one opening of the outer yoke, and an outer edge at the other opening edge of the outer yoke A mounting plate formed integrally with the outer yoke toward the outer side of the yoke, a lid disposed in the other opening of the outer yoke and hermetically joined to the mounting plate, and an inner side of the stator Arranged, times It said valve body feed screw formed on the shaft are those comprising a rotor mounted.

  According to this configuration, since the attachment plate is formed integrally with the outer yoke, the airtightness between the attachment plate and the outer yoke can be maintained with a simple configuration. Since the lid and the mounting plate are joined in an airtight manner, the airtightness between the lid and the mounting plate can be maintained. As a result, the fluid chamber side of the shutoff valve can be kept airtight. Conventionally, the can required for a gas seal can be dispensed with and can be configured at low cost.

  In a second aspect of the invention, the partition is formed integrally with the outer yoke.

  Since the partition wall is formed integrally with the outer yoke, the airtightness can be maintained, the configuration can be simplified, and the number of parts can be reduced.

  In a third aspect of the invention, the partition wall and the mounting plate are formed of a synthetic resin.

  By molding with synthetic resin, it can be easily integrally formed with the outer yoke, and airtightness can be maintained.

  In a fourth aspect of the present invention, a bearing for the rotary shaft is integrally formed on the partition wall.

  Since the bearing is integrally formed on the partition wall, the configuration can be simplified and the number of parts can be reduced.

  5th invention forms the annular groove for the sealing member attachment which seals between the to-be-attached parts in the said attachment plate.

Since the annular groove for mounting the seal member is formed on the attachment plate, it is not necessary to form the annular groove in the attached portion, and the workability can be improved. The annular groove can be formed at the same time as the mounting plate is formed, and the processing accuracy can be improved.

(Embodiment 1)
1 is a cross-sectional view of a shutoff valve according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the shutoff valve. FIG. 3 is an exploded perspective view of the motor portion of the shut-off valve.

  In FIG. 1, an exciting coil 31 in which a conductive wire is wound on a substantially bobbin-shaped coil bobbin, a first electromagnetic yoke 32 having a substantially circular outer periphery and a comb-shaped magnetic pole on the inner periphery, and a first electromagnetic yoke And a second electromagnetic yoke 33 having a substantially disc shape and having comb-shaped magnetic poles on the inner periphery, which are arranged so as to sandwich the exciting coil 31 between the first electromagnetic yoke 32 and the first electromagnetic yoke 32. Two electromagnetic yokes 33 are arranged in contact with each other.

  A pair of outer yokes 34 and 35 having cylindrical portions are arranged so as to cover the outer circumferences of the two sets of electromagnetic yokes 32 and 33, and caulking flange portions 34a and 35a formed on the outer circumferences of the outer yokes 34 and 35, etc. It is integrated. The outer yokes 34 and 35 form a stator 36 together with the two sets of electromagnetic yokes 32 and 33.

  A partition wall 37 made of synthetic resin is integrated with the first outer yoke 34 covering the outer periphery of the first electromagnetic yoke 32 so as to cover the open portion on the first outer yoke 34 side which is one open end of the stator 36. Is formed. A first bearing 38 is formed integrally with the partition wall 37.

  The second outer yoke 35 covering the outer periphery of the second electromagnetic yoke 33 has a synthetic resin mounting plate facing outward at the open end on the second outer yoke 35 side which is the other open end of the stator 36. 46 is integrally formed. The second outer yoke 35 and the attachment plate 46 are kept airtight by being integrally molded. In the mounting plate 46, an annular groove 46b for accommodating the elastic seal member 47 is formed on a sealing surface 46a on the gas meter side which is a mounting portion. In the present embodiment, the elastic seal member 47 uses a flat packing, but an O-ring made of synthetic rubber may be used.

  A rotor 43 is disposed inside the stator 36. The rotor 43 is a rotating shaft having a cylindrical permanent magnet 41 polarized in the circumferential direction and a feed screw 42a formed at one end thereof. 42.

  A synthetic resin lid 40 is disposed so as to cover the open portion of the second outer yoke 35. The lid 40 forms a cylindrical portion 40a in the center and a collar portion 40b on the outer periphery. The cylindrical portion 40a of the lid 40 is provided with a second bearing 39 that supports the feed screw 42a side of the rotor 43. Between the cylindrical portion 40a and the second bearing 39, a synthetic rubber O An elastic seal member 48 such as a ring is disposed to hold the space between the cylindrical portion 40 a of the lid 40 and the second bearing 39 in an airtight manner.

  The flange portion 40b of the lid 40 is formed in an annular shape protruding toward the fluid chamber 45 side of the gas meter, and the annular fitting in which the annular protrusion 46c formed in the attachment plate 46 is fitted on the surface of the flange portion 40b on the rotor 43 side Grooves are formed. The lid 40 is airtightly held and integrated by fitting the annular projections 46c of the mounting plate 46 into the fitting grooves and bonding them together.

  A valve body 49 is attached to the tip of the feed screw 43a of the rotor 43, and the valve body 49 is synthesized in a generally circular shape that can contact a valve seat (not shown) formed in the fluid chamber 45. The valve seat 51 is formed of rubber or the like, and a rigid valve seat holding member 52 disposed in contact with the surface of the valve seat 51 on the stator 36 side.

  The valve seat 51 has no through hole, and is mounted on the valve seat holding member 52 so as to embrace the valve seat holding member 52. A central hole is formed in the valve seat holding member 52, and the central hole is screwed into the feed screw 42 a of the rotating shaft 42. The lid 40 is provided with a wall (not shown), the valve seat holding member 52 is provided with a slit (not shown), and the valve seat holding member 52 is engaged with the slit so that the valve seat holding member 52 is rotated. It is comprised so that it may not rotate with respect to. Thereby, the rotation operation of the feed screw 42a is converted into the operation of moving the valve seat holding member 52 back and forth. The material of the valve seat holding member 52 is preferably polyacetal resin because of its low friction coefficient and economical reasons.

  A coil spring 53 is compressed and held between the lid 40 and the valve seat holding member 52.

  The operation and action of the shut-off valve configured as described above will be described below.

  When the gas usage state is not abnormal and the signals from various sensors do not indicate danger, there is no current from the control unit (not shown) of the microcomputer meter, and the shutoff valve is a valve as shown in FIG. The body 49 is on the stator 36 side, maintains a valve open state away from a valve seat (not shown), and allows gas to flow.

  If the gas usage state is abnormal or the signals from various sensors indicate danger, the control unit of the microcomputer meter applies a pulsed current having a phase difference to each conducting wire of the exciting coil 31, and the rotor 43 is turned on. Rotate. Since the slit (not shown) of the valve seat holding member 52 and the wall (not shown) of the lid 40 are engaged and the valve seat holding member 52 is prevented from rotating, the feed screw 42a linked to the rotor 43 The rotation operation is converted into a back-and-forth movement operation of the valve body 49, the valve body 49 is moved to a position where the valve seat 51 contacts the valve seat, and is urged by the coil spring 53 in a direction contacting the valve seat, Gas is shut off.

  Thereafter, even if the control unit of the microcomputer meter stops energization, the rotor 43 maintains the above state due to the holding torque, and the valve body 49 is closed by the valve seat 50 biased by the coil spring 53. Keep state.

  When the danger is released from the signals from various sensors and the control unit of the microcomputer meter determines that it can be restored, when the gas user recovers the dangerous state and operates the return switch provided on the gas meter or remote control panel, Alternatively, when a gas supplier or the like sends a remote return command by communication, the control unit of the microcomputer meter applies a pulsed current having an opposite phase difference to each conducting wire of the exciting coil 31, and the rotor 43 is turned on. Reverse rotation. Then, the valve body 49 is sent to the feed screw 42a and moves to the stator 36 side, the back surface of the valve seat holding member 52 comes into contact with the lid 40, and the rotation of the rotor 43 stops. Thereafter, even if the control unit of the microcomputer meter stops energization, the rotor 43 maintains the above-described state due to the holding torque, and maintains the valve open state shown in FIG.

  In the present embodiment, since the mounting plate 46 is formed integrally with the second outer yoke 35 located on the mounted portion side by synthetic resin, the mounting plate 46 and the second outer yoke are configured with a simple configuration. The airtightness with 35 can be maintained.

  Since the annular protrusion 46c of the mounting plate 46 is fitted and bonded to the fitting groove 40c formed on the outer periphery of the flange portion 40b of the lid 40, the airtightness between the lid 40 and the mounting plate 46 can be maintained. Since the fitting groove 40c and the annular protrusion 46c are fitted and bonded, the bonding allowance in the fluid leakage direction from the fluid chamber 45 side to the rotor 43 side can be increased, and the airtightness is improved. Can do.

  The mounting plate 46 is provided with an annular groove 46b for mounting an elastic seal member 48 for sealing with a gas meter as a mounted portion on the sealing surface 46a on the mounted portion side. It is not necessary to form an annular groove, and workability can be improved. The annular groove 46b can be formed at the same time as the mounting plate 46 is molded, and the processing accuracy can be improved. Since the annular groove 46b is formed at the same time as the mounting plate 46 is molded, the annular groove 46b can be formed with good dimensional accuracy, and a flat packing can be used as the elastic seal member 48. Can do.

  The partition wall 37 is formed integrally with the first outer yoke 34 from a synthetic resin, and the first bearing 38 is formed integrally with the partition wall 37. Therefore, the configuration can be simplified and the number of parts can be reduced.

  The partition wall 37 and the first outer yoke 34, and the mounting plate 46 and the second outer yoke 35 are connected to the first and second outer yokes through holes formed in the first and second outer yokes 34 and 35. Synthetic resin can be injected into the inner and outer surfaces of the yokes 34 and 35, and the mounting strength can be improved.

  Conventionally, a can that has been used as a gas seal can be dispensed with and can be configured at low cost.

  As described above, since the shut-off valve according to the present invention can be simplified in configuration and economical, it can be used as a shut-off valve for microcomputer meters.

31 Excitation Coil 32 First Electromagnetic Yoke 33 Second Electromagnetic Yoke 34 First Outer Yoke 35 Second Outer Yoke 36 Stator 37 Partition 38 First Bearing 39 Second Bearing 40 Lid 40a Cylindrical Part 40b Collar Part 40c Fitting groove 42 Rotating shaft 43 Rotor 45 Fluid chamber 46 Mounting plate 46a Seal surface 46b Annular groove 47 Elastic seal member 48 Elastic seal member 49 Valve body

Claims (5)

A valve body configured to come into contact with a valve seat formed in the fluid chamber; and a motor unit that moves the valve body, the valve body being separated from the valve seat by the motor unit. In a shut-off valve that holds in a valve open state in which fluid can flow and a valve closed state in which the valve body abuts against the valve seat and blocks fluid flow,
The motor part is
An outer yoke with a stator inside,
A partition formed on one opening edge of the outer yoke so as to cover one opening of the outer yoke;
A mounting plate formed integrally with the outer yoke toward the outside of the outer yoke at the other opening edge of the outer yoke;
A lid disposed in the other opening of the outer yoke and airtightly joined to the mounting plate;
A shutoff valve comprising: a rotor disposed inside the stator and having the valve element mounted on a feed screw formed on a rotating shaft.   The shut-off valve according to claim 1, wherein the partition wall is formed integrally with the outer yoke.   The shut-off valve according to claim 2, wherein the partition wall and the mounting plate are made of a synthetic resin.   The shut-off valve according to claim 3, wherein a bearing for the rotary shaft is formed integrally with the partition wall.   The shut-off valve according to claim 3, wherein an annular groove for attaching a seal member that seals between the attachment portion and the attached portion is formed in the attachment plate.

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