JP2001187978A - Shutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutoff valve highly reliable for airtightness with little change in the compression rate of a seal member even in a long-term use. SOLUTION: An elastic seal member 58 is circumferentially compressed and arranged between the outer surface of the cylindrical part 47c of a bulkhead 47 and the inner surface of the stepped part 57b of a mounting plate 57. According to this, even if a slight axial slippage between the bulkhead 47 and the mounting plate 57 is caused by the clearance of a caulking part in assembling, or the fixation of the bulkhead 47 to the mounting plate 47 is loosened by corrosion or thermal expansion during a long-term use, the compression rate of a seal member 80 is hardly influenced thereby.

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 used as a shut-off mechanism of a gas shut-off device, and more particularly, to a shut-off valve by moving a valve body forward or backward with respect to a valve seat formed in a flow passage. The present invention relates to a shut-off valve using a motor that performs a road cut-off return operation as a power source.

[0002]

2. Description of the Related Art In order to prevent gas accidents, various types of safety devices have been used in the past. Above all, the flow rate of gas is monitored by a built-in gas meter and the flow rate sensor is monitored. Battery power that shuts off gas with the shut-off valve built into the gas meter if it is judged, or if it is judged that there is a dangerous state by monitoring the status of sensors such as earthquake sensors, gas pressure sensors, gas alarms, carbon monoxide sensors, etc. The use of gas meters with built-in gas shut-off devices equipped with microcomputers (hereinafter abbreviated as microcomputer meters) has been promoted due to their advantages such as safety, ease of gas piping, and low price, and in recent years almost all households have been spread. Has been reached. In addition, the ratio of centralized monitoring microcomputer meters with a telemeter function that centrally monitors the gas flow rate information measured by the flow rate sensor using a telephone line etc. has also increased, and the convenience of information terminals has been further improved. It has been demanded. In this centralized monitoring microcomputer meter, the gas can be shut off and returned by simple electric switch operation or remote operation by telephone line etc.
There is a demand for a shut-off valve that does not require energy to maintain the open and closed states, with both gas shut-off and gas return being possible by electric energy from a battery mounted on a microcomputer meter.

Conventionally, as a driving method of the shut-off valve, a method using an electromagnetic solenoid has been mainly used, but in recent years, a relatively strong closing force and a returning force can be realized, and a PM type stepping device capable of holding a state when not energized is used. Attention has been focused on shut-off valves that use a motor as a drive source.Among them, a shut-off valve that has an airtight partition with the rotor inside the gas passage and the stator outside the gas passage is easy to attach to the gas passage. Mainstream.

Hereinafter, a conventional shut-off valve will be described.

A conventional shut-off valve of this type is disclosed in Japanese Patent Application Laid-Open No. 9-60 / 1997.
Japanese Unexamined Patent Application Publication No. 752 and Japanese Unexamined Patent Application Publication No. 11-2352 have generally been used. As shown in FIG. 6, the shut-off valve described in Japanese Patent Application Laid-Open No. H11-2352 has a cup-shaped casing 6 with a flange, and a stator 4 is mounted on the outer periphery of the casing 6. An outer bush 3 made of a synthetic resin is fitted to the portion, a stud 5 is eccentrically mounted on the outer bush 3 and protrudes forward, and an inner bush 12 is inserted into the casing 6, and the outer bush 3 and the Inner bush 12
The lead screw 17 is rotatably supported in the forward and reverse directions with the male screw portion 17a at the tip protruding forward from the outer bush 3. The rotor 16 is opposed to the stator 4 by the lead screw 17. attachment,
A thrust load rolling bearing 18 is interposed between the rotor 16 and the outer bush 3 so that the stud 5
And the valve body 25 is screwed into the male screw portion 17a. The elastic seal member 8, the outer bush 3, and the casing 6 are sandwiched between the stepped flange 2 and the flat plate flange 7, and the stepped flange 2 and the flat plate flange 7 are fixed by caulking.

[0006] With respect to the shut-off valve configured as described above,
The operation will be described below.

At the time of abnormal use of gas or the like, the rotor 16 is rotated in the forward direction by energization from a control unit (not shown), the lead screw 17 is rotated in the forward direction, and the valve body 25 is moved from the lead screw 17 side to the valve. The valve seat 26 moves forward to the seat 26 side.
A closes the fluid path and shuts off the fluid. In order to restore this, the lead screw 17 is rotated in the reverse direction by an external input, and the valve body 25 is rotated.
From the valve seat 26 side to the lead screw 17 side,
The fluid path was opened to resume fluid supply.

[0008]

This type of shut-off valve, when mounted on a gas meter, has the outside of the casing 8 on the air side, and when the gas meter is installed outdoors, it has high humidity, ozone, temperature change, etc. You will be exposed to harsh environments. Among them, high reliability is required that does not cause gas leakage or the like without any particular maintenance during the service period of the gas meter (generally 10 years).

In the above-mentioned conventional shut-off valve, the elastic seal member 8 is sandwiched in the thrust direction between the stepped flange 2 and the flat plate flange 7, and the compression ratio of the elastic seal member 8 is determined by the step depth of the stepped flange 2. I rely on the stepped flange 2
It is assumed that the plate flange 7 and the plate flange 7 are sufficiently caulked. However, in the caulking method, pressure before caulking is sometimes insufficient, and a gap may be formed in the caulked portion. At this time, when the elastic seal member 8 is compressed in the thrust direction as in a conventional shut-off valve, There is a problem that the compression ratio becomes insufficient and airtightness may deteriorate during long-term use.

Further, since the base material is largely deformed at the caulked portion, the surface treatment film is often peeled off or cracked at the time of caulking, and furthermore, the contact portion between the stepped flange 2 and the flat plate flange 7 or the like. Is likely to retain moisture, and the caulked portion and contact portion between the stepped flange 2 and the flat plate flange 7 are corroded during long-term use, the flat plate flange 7 is lifted from the stepped flange 2, and the compression ratio of the elastic seal member 8 is reduced. However, there is a problem that the airtightness may be deteriorated during long-term use.

Further, since the elastic seal member 8, the outer bush 3 made of synthetic resin, and the casing 6 are simultaneously sandwiched between the stepped flange 2 and the flat plate flange 7, the outer bush 3 expands and contracts due to a temperature change. The caulking between the flange 2 and the flat plate flange 7 is loosened, and the compression ratio of the elastic seal member 8 becomes insufficient, or the outer bush 3 expands in the radial direction to make the elastic seal member 8 in an over-compressed state to reduce the compression set. There is a problem that the airtightness may be deteriorated during use for a long period of time.

The present invention has been made in view of the above-mentioned conventional problems, and the compression ratio of the seal member hardly changes during long-term use.
It is an object of the present invention to provide a shut-off valve having high reliability regarding airtightness.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pot-shaped rigid partition having no through hole and a cylindrical portion of the partition which can be attached to a fluid chamber. A rigid mounting plate having a cylindrical step portion with a slightly larger inner diameter, and a sealing member made of an elastic body compressed in the circumferential direction between the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the step portion of the mounting plate. It is arranged.

For this reason, the compression ratio of the sealing member is determined by the outer diameter of the cylindrical portion of the rigid partition and the inner diameter of the step of the rigid mounting plate. Hardly affected. And, when the gap between the partition and the mounting plate is slightly displaced in the axial direction due to the generation of a gap between the caulked parts during assembly, or when the partition and the mounting plate are corroded or thermally expanded during long-term use. Even in the case where loosening of the fixation occurs, the compression ratio of the seal member is hardly affected, and a shut-off valve having high airtightness can be provided.

Also, a synthetic resin lid having a bearing disposed at the center is fitted into the open end of the partition, and the outer periphery of the lid is held between the open end of the partition and the bottom surface of the mounting plate step,
This partition wall is urged in the direction of the mounting plate by the urging means.

Thus, the bearing on the open end side of the partition can be easily arranged integrally with the lid, the compression ratio of the seal member is not affected by the expansion and contraction of the lid due to a temperature change, and the partition is urged. Since the lid is biased by the means, the assembly of the partition and the mounting plate is not loosened due to expansion and contraction of the lid due to temperature change, and a shut-off valve having higher reliability in airtightness can be provided.

Further, the urging means is formed so as to regulate the relative position of the partition and the stator in the axial direction, and can be changed into a holding portion of the lid to change the axial position of the lid with respect to the mounting plate. This is one in which a circumferential rib-shaped dimension absorbing portion is formed.

Thus, when the partition wall, the lid, the stator and the biasing means are assembled, the biasing means regulates the relative position of the partition wall and the stator in the axial direction. The length is regulated, and it is possible to prevent the seal member from being over-compressed due to being compressed in the axial direction, thereby deteriorating the airtightness. Also, when assembling,
The protrusion or rib-shaped dimension absorbing part of the lid holding part is selectively deformed by the urging force of the urging means, and does not carry large stress on other parts of the lid or the partition wall. A shut-off valve that can securely clamp the lid between the mounting plate and the open end of the partition wall while maintaining the dimensions, does not deform the entire lid, the bearings disposed on the lid, and the partition wall, and has reliable airtightness and reliable operating characteristics. Can be provided.

Further, a backup ring for preventing the seal member from falling off from the step portion of the mounting plate is disposed between the stator and the seal member.

At the time of assembling the assembly of the partition and the stator and the mounting plate, usually, a seal member is fitted on the outer periphery of the cylindrical portion of the partition, and then the seal member is inserted into the cylindrical step of the mounting plate. At this time, there is a risk that the seal member may be caught in the corner of the cylindrical step portion of the mounting plate, or the seal member may bite into the R portion of the corner to lower the airtightness. However, a backup ring is formed on the side surface of the mounting plate of the stator. By this, the sealing member can be inserted deeper than the R portion of the corner of the cylindrical portion of the mounting plate, and the protrusion gap can be reduced. And the cut-off valve having higher reliability in airtightness can be provided.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shut-off valve according to the present invention is provided with a stator having an exciting coil, a rigid partition formed coaxially inside the stator and having a pan shape without through holes, and mounted in a fluid chamber. A rigid mounting plate formed with a cylindrical step portion having an inner diameter slightly larger than the cylindrical portion outer diameter of the partition wall, and a circumferential portion between the cylindrical portion outer periphery of the partition wall and the mounting plate step inner portion. It comprises a sealing member made of an elastic body, which is arranged by being compressed, a rotor arranged inside the partition wall facing the stator, and a valve mechanism arranged on a rotation shaft of the rotor. .

The compression ratio of the sealing member is determined by the outer diameter of the cylindrical portion of the rigid partition and the inner diameter of the step of the rigid mounting plate. There is no influence, and there is a slight axial displacement between the partition and the mounting plate due to the formation of a gap in the caulked part during assembly, or the partition and the mounting plate may be damaged due to corrosion or thermal expansion during long-term use. Even if looseness of the sticking occurs, the compression rate of the seal member is hardly affected, and a shut-off valve having high airtightness can be provided.

Further, in addition to the above features, the shut-off valve of the present invention has a biasing means for biasing the partition wall in the direction of the mounting plate, and a synthetic resin made of a synthetic resin having a bearing at the center inserted into the open end of the partition wall. And an outer peripheral portion of the lid is held between the open end of the partition wall and the bottom surface of the step portion of the mounting plate.

The bearing on the open end side of the partition can be easily arranged integrally with the lid, the compression rate of the seal member is not affected by the expansion and contraction of the lid due to a temperature change, and the partition is biased by the urging means. Therefore, assembling of the partition and the mounting plate is not loosened due to expansion and contraction of the lid due to temperature change, and a shut-off valve having higher reliability in airtightness can be provided.

In the shut-off valve according to the present invention, in addition to the above two features, the urging means is formed so as to regulate the relative position of the partition and the stator in the axial direction. A projection or a circumferential rib-like dimension absorbing portion that can change the axial position of the lid with respect to the mounting plate by being deformed is formed on the holding portion of the lid to be sandwiched.

When the partition, the lid, the stator, and the biasing means are assembled, the biasing means regulates the relative position of the partition and the stator in the axial direction. Therefore, it is possible to prevent the seal member from being over-compressed due to the axial compression of the seal member and deteriorating the airtightness. In addition, at the time of assembly, the protrusion of the lid holding portion or the rib-shaped dimension absorbing portion is selectively deformed by the urging force of the urging means, so that it does not bear a large stress on other parts of the lid or the partition. The lid can be firmly sandwiched between the mounting plate and the open end of the partition wall while maintaining the dimensions of the part where the seal member can be inserted, without deforming the entire lid, the bearings and the partition wall disposed on the lid, and the reliability of airtightness and operating characteristics. It is possible to provide a shutoff valve having characteristics.

Further, in addition to the above-mentioned features, the shut-off valve of the present invention has a backup ring disposed between the stator and the seal member to prevent the seal member from falling off from the step portion of the mounting plate. .

When assembling the assembly of the partition wall and the stator and the mounting plate, usually, a seal member is fitted around the outer periphery of the cylindrical portion of the partition wall, and then the seal member is inserted into the cylindrical step portion of the mounting plate. At this time, there is a risk that the seal member may be caught in the corner of the cylindrical step portion of the mounting plate, or the seal member may bite into the R portion of the corner to lower the airtightness. However, a backup ring is formed on the side surface of the mounting plate of the stator. By this, the sealing member can be inserted deeper than the R portion of the corner of the cylindrical portion of the mounting plate, and the protrusion gap can be reduced. And the cut-off valve having higher reliability in airtightness can be provided.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1, 2 and 3 are sectional views of a shut-off valve according to a first embodiment of the present invention in an open state, during a shut-off operation, and in a closed state, respectively.

In FIG. 1, an exciting coil 43 in which a conducting wire 42 is wound around a coil bobbin 41 having a generally thread-wound shape, and a first electromagnetic yoke 44 having a cylindrical portion on the outer periphery and a comb-shaped magnetic pole on the inner periphery A set of a second electromagnetic yoke 45 having a generally disk-shaped and comb-shaped magnetic pole on the inner periphery arranged to sandwich the excitation coil 43 between the electromagnetic yoke 44 and
The sets are arranged so that the disk portions of the second electromagnetic yokes 45 are in contact with each other to form a stator 46. Coil bobbin 41
Is made of synthetic resin, polybutylene terephthalate (PBT)
It is desirable that the material has heat resistance and good electrical insulation.

The first electromagnetic yoke 44 and the second electromagnetic yoke 45 are made of a steel plate such as a low-carbon steel plate, an electromagnetic soft iron plate, or a silicon steel plate. Pre-plated steel sheets, such as galvanized steel sheets, which are rust-treated or made of electromagnetic stainless steel sheets, are economically desirable. The comb-shaped magnetic poles of the first electromagnetic yoke 44 and the second electromagnetic yoke 45 mesh with a predetermined gap, and the two sets of comb teeth are substantially the same as the other set of comb teeth in the rotation direction. It is arranged to be located in the gap.

Coaxially inside the stator 46, a two-stage bottom 4
7a, 47b, large and small cylindrical portions 47c, 47d, and a large-diameter cylindrical portion 47c are provided at the open ends with a metallic partition wall 47 having no fitting hole formed by drawing in a pan shape having a flange 47e. Rigid bodies such as non-magnetic stainless steel plates, copper alloys, aluminum alloys, synthetic resins, and ceramics can be selected for the material of the partition wall 47. However, for reasons such as corrosion resistance, strength, creep resistance, and thin-wall workability, austenite is used. The best one is drawn from a stainless steel sheet, and it is desirable that the solid solution is subjected to a solution heat treatment after the drawing to remove residual internal stress and refinement of crystal grains.

A first bearing 48 made of synthetic resin and having a center hole 48a is fitted inside the small-diameter cylindrical portion 47d of the partition wall 47 on the side surface of the pan. The cylindrical portion 47d of the partition wall 47 and the first
Are fitted with an interference fit. First bearing 4
A thinned ripple-like stress relief portion 48c is formed between the fitting portion 48b of FIG. 8 and the center hole 48a.

A stopper 48d is formed so as to contact the bottom 47a of the partition wall 47. This first bearing 48
Are polyacetal (POM), polyamide (P
A) Synthetic resin with self-lubricating properties such as A) and various synthetic resins blended with polytetrafluoroethylene (PTFE) powder and graphite particles can be selected, but polyacetal is most suitable because of its low friction coefficient and economical reasons. It is. Since this polyacetal has relatively large stress creep and is soft, it is necessary to set a relatively large interference when setting an interference fit.
When the inner diameter of the cylindrical portion 47d of 7 is 8 mm, the outer diameter of the insertion portion 48b of the first bearing 48 is suitably about 8.05 to 8.1 mm.

A second bearing 49a is provided on the open end side of the pan side of the large-diameter cylindrical portion 47c of the partition wall 47, and the cylindrical portion 4 is provided on the side surface.
9b, a lid 49 made of a synthetic resin having a flange portion 49c coaxially on the outer periphery is fitted and fitted with the flange portion 49c abutting against the flange 47e of the partition wall 47. The cylindrical portion 47c of the partition wall 47 and the fitting insertion portion 49e of the lid 49 are fitted by tight fit. Between the insertion portion 49e of the lid 49 and the second bearing 49a,
A thinned ripple-like stress relaxation portion 49d is formed.

The material of the lid 49 is the first bearing 4
As in 8, polyacetal is optimal. The interference fit between the cylindrical portion 47c of the partition wall 47 and the insertion portion 49e of the lid 49 may be relatively loose because there is another fixing means to be described later, and also to prevent the disk portion 49f from waving.
For example, when the inner diameter of the cylindrical portion 47c of the partition wall 47 is 18 mm, the outer diameter of the fitting portion 49e of the lid 49 is 18.02-1.
About 8.08 is appropriate. On the inner surface of the cylindrical portion 49b of the lid 49, a convex rib 50 parallel to the central axis is provided on the inner surface of the cylindrical portion 49b.
It is formed at two places 80 degrees apart.

Inside the partition 47, a cylindrical permanent magnet 51 polarized in the circumferential direction is provided with a feed screw 5 at one end.
2, the rotating shaft 53, the permanent magnet 51 and the rotating shaft 53
5 comprising a sleeve 54 coaxially holding
5 is the second end of the lid 49 on the end of the rotary shaft 53 on the feed screw 52 side.
Of the first bearing 48 with the opposite end
8a is rotatably loosely inserted and disposed.

Mounting plate 5 mountable in fluid chamber 56
7 is a large-diameter cylindrical portion 4 of a center hole 57a and a partition wall 47 in the center.
Cylindrical step 5 having an inner diameter slightly larger than the outer diameter of 7c
7b are formed, and claw-shaped fitting portions 57c are formed at two locations on the outer peripheral portion.
Is formed. The end of the large-diameter cylindrical portion 47c of the partition wall 47 is inserted into the step portion 57b, and the cylindrical portion 49 of the lid 49 is inserted.
b projects through the center hole 57a toward the fluid chamber 56, and an elastic seal member 58 such as a synthetic rubber O-ring is provided between the outer periphery of the cylindrical portion 47c and the inner periphery of the stepped portion 57b.
7 are arranged so as to be compressed in the circumferential direction with respect to the central axis. The flange portion 49c of the lid 49 is held between the bottom surface 57d of the step portion 57b of the mounting plate 57 and the flange 47e of the partition wall 47.

A stator 46 is disposed in contact with the flat surface of the mounting plate 57 on the partition 47 side, and the stator 46 and the partition 47 are pressed and sandwiched between the mounting plate 57 and both ends of the mounting plate 57 are fitted. A substantially U-shaped support frame 59 (biasing means) is provided so as to be fitted to the joint portion 57c. The support frame 59 is formed with an engaging portion 59b that can be engaged with the stator 46 to prevent the stator 46 from rotating.

In this example, the engaging portion 59b has a convex shape when viewed from the back, and the leading end is inserted into the hole opened in the electromagnetic yoke 44 to engage with the electromagnetic yoke 44, and the electromagnetic yoke 44 is formed by the convex step portion. It is biased toward the mounting plate 57 side. Stator 46
A backup ring 60 that prevents the seal member 58 from falling off the stepped portion 57b of the mounting plate 57 is disposed between the seal ring 58 and the seal member 58. Mounting plate 5
7. The material of the support frame 59 is a rigid material having gas resistance, corrosion resistance and strength, such as a surface-treated steel plate, a stainless steel plate, a copper alloy plate, and an aluminum alloy plate. Steel plate is easy to choose.

The moving body 61 disposed in the fluid chamber 56 has a center hole 61a screwed into the feed screw 54 of the rotating shaft 53, and a substantially disk-shaped spring receiver 61b is formed on the stator 46 side.
At the other end, a large-diameter engagement ring portion 61c is formed, and a small-diameter cylindrical portion 61d is formed therebetween. On the outer periphery of the spring receiver 61b, concave portions 61e (not shown) that can be engaged with the ribs 50 of the lid 49 are formed at four locations at 90 ° intervals on the circumference. This concave portion 61 e is
, The rotation of the moving body 61 and the bearing 49 is prevented, and the rotation operation of the feed screw 54 is converted into the front-back operation of the moving body 61. As the material of the moving body 61, a synthetic resin having self-lubricating properties such as polyacetal (POM), polyamide (PA), and various synthetic resins blended with polytetrafluoroethylene (PTFE) powder and graphite particles can be selected. However, polyacetal is optimal because of its low coefficient of friction and economical reasons.

The valve body 62 has a generally disk-shaped flexible valve seat 63 made of synthetic rubber or the like, which can abut a valve seat 65 formed in the fluid chamber 56, and a valve seat 63 on the side of the stator 46 of the valve seat 63. The valve seat holding member 64 is made of a rigid material such as synthetic resin and is disposed in contact with the valve seat holding member 64. The valve seat 63 has no through hole, has an engagement ring portion 63a formed on the outer periphery, and is loosely fitted so as to embrace the valve seat holding member 64.

The valve seat protection member 64 has a cylindrical portion 64b which protrudes toward the stator 46, has an inner diameter substantially equal to the outer diameter of the engagement ring portion 61c of the moving body 61, and is formed with a vertical split 64a in the axial direction. At the end of the cylindrical portion 64b, there is provided an engaging claw 64c which has an inner diameter which is smaller than the outer diameter of the engaging ring portion 61c of the moving body 61 and which is substantially equal to the outer diameter of the cylindrical portion 61d of the moving body 61. 61 and are arranged. A gap 69 is provided between the tip of the cylindrical portion 64b of the valve seat holding member 64 and the spring receiver 61b of the moving body 61.
The material of the valve seat holding member 64 is polyacetal (PO
A gas-resistant synthetic resin material such as M), polyamide (PA), or polybutylene terephthalate (PBT) is desirable.

A coil spring 66 having an inner diameter substantially equal to the outer diameter of the cylindrical portion 64b of the valve seat holding member 64 is compressed and held between the moving body 61 and the valve seat holding member 64.

The moving body 61 and the valve body 62 constitute a valve mechanism.

The sleeve 54 of the rotor 55 and the first bearing 4
8. Polyamide (PA) containing polytetrafluoroethylene (PTFE) and graphite particles between lid 49
Thrust washers 67 and 68 made of a synthetic resin having self-lubricating properties such as are provided.

Next, the operation and operation of the shut-off valve according to the first embodiment will be described.

When the gas usage is not abnormal and the signals from the various sensors do not indicate danger, there is no power supply from the control unit (not shown here) of the microcomputer meter, and the shut-off valve is shown in FIG. As described above, the moving body 61 is on the stator 46 side, the valve body 62 keeps the valve open state away from the valve seat 65, and gas can flow therethrough.

When the use condition of the gas is abnormal or the signal from the various sensors indicates danger, the control unit of the microcomputer meter applies a pulse-like current having a phase difference to each lead wire 42 of the exciting coil 43. Then, the rotor 55 is rotated forward.
Since the movable body 61 has its concave portion 61e engaged with the rib 50 and is prevented from rotating, the feed screw 54
Is converted into a front-back movement of the moving body 61, and the valve body 62 engaged with the moving body 61 has a valve seat 63 with the valve seat 6.
5 and comes into a state shown in FIG.
When the moving body 61 further advances toward the valve seat 65, the coil spring 66 is further compressed, the tip of the cylindrical portion 64b of the valve seat holding member 64 and the spring receiver 61b of the moving body 61 abut, and the valve seat 63 bends. Compressed and finally mobile 6
1 is greater than the thrust of the feed screw 54, and the rotation of the rotor 55 is stopped. Thus, the valve element 62 is connected to the valve seat 6.
5 is urged by a coil spring 66 to shut off gas. FIG. 3 shows the shut-off valve in the closed state.

Thereafter, even if the control unit of the microcomputer meter stops the energization, the rotor 55 holds the state due to the holding torque, so that the valve body 62 is closed by the valve seat 65 biased by the coil spring 66. Keep state.

When the control unit of the microcomputer meter determines that the danger is released from the signals from the various sensors and the danger can be restored, or when the gas user recovers from the danger state and operates the return switch provided on the meter or the remote control panel. In this case, when the gas supplier or the like sends a remote return command by communication, the control unit of the microcomputer meter applies a pulse-shaped current having an opposite phase difference to each of the conductive wires 42 of the exciting coil 43, To reverse rotation. Then feed screw 5
4, the moving body 61 moves to the stator 46 side, the valve body 62 separates from the valve seat 65, and the gas can flow.
The moving body 61 further moves to the stator 46 side, and finally the moving body 61 comes into contact with the lid 49 and becomes a moving bottom dead center, and the rotation of the rotor 55 stops. Thereafter, even if the control unit of the microcomputer meter stops energization, the rotor 55 holds the state due to the holding torque and holds the valve open state shown in FIG.

When this type of shut-off valve is mounted on a gas meter, the outside of the casing 8 is on the air side,
When the gas meter is installed outdoors, it is exposed to severe environments such as high humidity, ozone, and temperature change. Among them, high reliability is required that does not cause gas leakage or the like without any particular maintenance during the service period of the gas meter (generally 10 years).

The shut-off valve of the present embodiment has the elastic seal member 5
8 is arranged in the circumferential direction between the outer periphery of the cylindrical portion 47c of the partition wall 47 and the inner periphery of the mounting plate 57 stepped portion 57b.
Determined by the outer diameter and the inner diameter of the step 57b of the mounting plate 57,
It is hardly affected by minute fluctuations in the positions of the partition wall 47 and the mounting plate 57 in the axial direction. At the time of assembly, the fitting portion 5
When a slight axial displacement occurs between the partition wall 47 and the mounting plate 57 due to the generation of the gap 7c, or when the fitting portion 57c is loosened due to corrosion during long-term use, the partition wall 47 and the mounting plate 57 The sealing member 58 can be used even when loosening of the fixing of the cover 49 occurs, or when a gap is formed between the bottom surface 57d of the step portion 57b of the mounting plate 57 and the flange 47e of the partition wall 47 due to creep deformation of the flange portion 49c of the lid 49. The compression ratio is hardly affected, and a shut-off valve with high airtightness can be provided.

Further, a synthetic resin lid 4 having a bearing 49a disposed at the center at the open end of the large-diameter cylindrical portion 47c of the partition wall 47.
9 is inserted and the flange 49 c on the outer periphery of the lid 49 is fitted to the flange 47 e at the open end of the partition wall 47 and the mounting plate 57 stepped portion 57.
Since the partition 47 is biased in the direction of the mounting plate 57 by the support frame 59 (biasing means), the partition 47 is integrally formed with the lid 49 on the open end side of the partition 47. The bearing 49a can be easily arranged, the compression rate of the seal member 58 is not affected by the expansion and contraction of the lid 49 due to temperature change, and the partition wall 47 is moved toward the mounting plate 57 by the support frame 59 (biasing means). Since the urging is performed, the assembly of the partition wall 47 and the mounting plate 57 is not loosened due to expansion and contraction of the lid 49 due to a temperature change, and a shutoff valve having higher reliability in airtightness can be provided.

Further, since the backup ring 60 for preventing the sealing member 58 from falling off from the step 57b of the mounting plate 57 is disposed between the stator 46 and the sealing member 58, the backup ring 60 of the mounting plate 57 has a step 57b. The seal member 58 can be inserted deeper than the R portion of the corner 57e, and the radial gap between the stepped portion 57b of the mounting plate 57 and the backup ring 60, that is, the protruding gap can be reduced. It is possible to prevent the seal member 60 from being caught in the step 57b and the corner 57e of the mounting plate 57 and to cut into the R portion of the corner 57e, and to provide a shut-off valve having higher reliability in airtightness.

In FIG. 1, two sets of the exciting coil 43, the first electromagnetic yoke 44, and the second electromagnetic yoke 45 are provided, but three or more sets may be provided.
Although the stator 46 and the partition wall 47 are fitted to the mounting plate 57 by the support frame 59, they may be fixed to each other by welding without the support frame. However, in this case, care must be taken because the brim portion 49c of the lid 49 absorbs expansion due to thermal stress and undergoes creep deformation. Also,
A rib 50 is provided on the lid 49, and a concave portion 61e is provided on the moving body 61.
However, a groove may be provided in the second bearing, and a convex portion may be provided in the moving body to engage with the moving body to serve as rotation preventing means. A rod offset from the center may be protruded from the mounting plate or the second bearing. Alternatively, a hole or a groove may be formed in the moving body and engaged with the moving body to serve as rotation preventing means. Although the thrust bearings are the thrust washers 67 and 68 which are sliding bearings, rolling bearings such as ball bearings may be used.
However, in the case of a shut-off valve of a microcomputer meter, the use of a lubricating oil is not preferable because the valve is often left in a state where the valve is opened and stopped for a long period of time. The linear motion mechanism is a feed screw 5
Although the screw mechanism of the engaging member 2 and the engaging part of the moving body 61 is used, a cylindrical cam mechanism may be used, and the feed screw 52 is formed on the rotary shaft 53. Is also good. Further, although the valve body 62 and the moving body 61 are separate parts, they may be integrally formed. Although the valve seat 63 embraces the valve seat holding member 64, the valve seat 63 may be fitted at the center, and a central axis is formed in the valve seat holding member to allow the valve seat to pass through the valve seat in an airtight manner. It may be fastened.

(Embodiment 2) FIG. 4 is a sectional view of a shut-off valve according to Embodiment 2 of the present invention in an open state.

Inside the stator 46, there are formed two-stage bottoms, large and small cylindrical portions 47c and 47d, and a pan-shaped partition having no through hole having a flange 47e at the open end of the large-diameter cylindrical portion 47c. 47 are arranged. Small-diameter cylindrical portion 4 of partition wall 47
A first bearing 73, which is a rolling bearing, is arranged on the inner surface of 7d. A synthetic resin lid 74 having a second bearing 71 as a rolling bearing is fitted at the open end of the large-diameter cylindrical portion 47c of the partition wall 47. The lid 74 is provided with a pin 75 offset from the center axis. A rotor 76 is provided inside the partition wall 47 with a feed screw 77 protruding from the lid 74.

Mounting plate 7 that can be mounted in fluid chamber 56
8 has a central hole 78a in the center and a large-diameter cylindrical portion 47c of the partition wall.
Cylindrical stepped portion 78b having an inner diameter slightly larger than the outer diameter of
The end of the large-diameter cylindrical portion 47c of the partition wall 47 is inserted into the step portion 78b, and the cylindrical portion 74b of the lid 74 passes through the center hole 78a toward the fluid chamber 56 side, and the outer periphery of the cylindrical portion 47c is formed. An elastic seal member 58 such as an O-ring made of synthetic rubber is disposed between the inner periphery of the step portion 78b and the inner periphery of the step portion 78b while being compressed in the circumferential direction with respect to the center axis of the partition wall 47. The collar 74c of the lid 74 is formed with a small protrusion-shaped dimension absorbing portion 79 projecting toward the bottom surface 78d of the step portion 78b of the mounting plate 78. The flange portion 74c is formed on the bottom surface of the step portion 78b of the mounting plate 78. 78d and the flange 47e of the partition wall 47 are sandwiched and held.

FIG. 5 shows the shut-off valve lid 7 according to the second embodiment of the present invention.
4 is a perspective view. (A) shows an example in which the dimension absorbing portion 79a is a plurality of small protrusions, and (b) shows an example in which the dimension absorbing portion 79b is a thin circumferential rib.

A metallic support plate 72 (biasing means) formed by regulating the relative position in the axial direction is arranged outside the stator 46 so that the partition wall 47 does not protrude outside the stator 46 too much. The electromagnetic yoke 78 and the electromagnetic yokes of the stator 46 and the support plate 72 (biasing means) are fixed to each other by welding. A seal member 58 is provided between the stator 46 and the seal member 58 by a step portion 78 b of the mounting plate 78.
A backup ring 60 is provided to prevent the backup ring 60 from falling off. When the axial dimension is regulated by the support plate 72 (biasing means), a seal member 58 having a constant axial dimension can be stored between the backup ring 60 and the flange 47e of the partition wall 47. A housing is formed.

For this reason, since the seal member 58 is not subjected to excessive compression in the axial direction and is less likely to be in an over-compressed state, it is possible to prevent the occurrence of compression set and deterioration of airtightness.

When the partition wall 47, the lid 74, the seal member 58, the backup ring 60, the stator 46, and the support plate 72 (biasing means) are assembled, the size of the lid 74 is measured from the contact surface 46a of the stator 46 with the mounting plate 78. The axial length up to the absorbing portion 79 is slightly longer than the depth of the step portion 78 b of the mounting plate 78, and when the assembly such as the partition 47 is inserted into the lid 74, the tip of the dimension absorbing portion 79 Only the parts are assembled while being selectively deformed, and do not transmit large stress to other parts.

For this reason, the lid 74 can be firmly held between the mounting plate 78 and the open end of the partition wall 47 while the dimensions of the portion into which the seal member 58 enters are secured, and the dimensional absorbing portion 7
In order to prevent a large stress from being applied to portions other than the partition 9 and the partition 47, the second bearing 7 disposed on the entire lid 74 and the lid 74 is provided.
1. A shut-off valve having airtightness and reliable operation characteristics can be realized without deforming the partition wall 47.

The valve body 80 includes a valve seat 81 and a valve seat holding member 82, and a convex portion of the valve seat holding member 82 is inserted into a concave portion of the valve body 80. On the rotor 46 side of the valve seat holding member 82, a female screw 82 screwable with a feed screw 77 is provided.
a, and a guide groove 82b engageable with the pin 75 is formed.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted. Since the details of each part are the same as those of the first embodiment, the description is omitted.

The operation of the shut-off valve is substantially the same as that of the first embodiment, and a detailed description thereof will be omitted. The difference from the first embodiment is that the shut-off valve includes a valve body 80 and a moving body (a female screw 82a).
Are integrally formed and there is no coil spring. Therefore, in the shut-off operation, the rotor 76 rotates, the valve body 80 moves and comes into contact with the valve seat 65, the valve seat 81 bends, and the rotation of the rotor 76 is stopped. It is completed by stopping. Since the shut-off valve relies on the elastic force of the valve seat 81 to close the valve body when the valve is closed, the valve closing stability is lower than in the first embodiment in which the coil spring 66 provides a stable biasing force. Although slightly inferior, there is an economic effect because the number of parts can be reduced.

As described above, the shut-off valve according to the second embodiment can prevent the sealing member 58 from being over-compressed due to being compressed in the axial direction, thereby preventing the airtightness from deteriorating. The lid 74 can be firmly held between the mounting plate 78 and the open end of the partition wall 47 while maintaining the dimensions of the second bearing 7 provided on the entire lid 74 and the lid 74.
1. It is possible to provide a shut-off valve which does not deform the partition wall 47 and has reliable airtightness and operating characteristics.

Although the first bearing 73 and the second bearing 71 are rolling bearings in FIG. 4, they may be sliding bearings, and the second bearing 71 may be formed integrally with the lid 74. . Further, the support plate 72 (biasing means) is made of metal, but may be made of synthetic resin and is welded to the stator 46. However, it may be fitted or engaged with the mounting plate 78. The mounting plate 78, the respective electromagnetic yokes of the stator 46, and the support plate 72 (biasing means) are fixed to each other by welding, but may be fitted to each other.
The biasing means such as the support plate 72 may be held by fitting to the mounting plate 78. Further, the pin 75 serving as the rotation preventing means may be formed integrally with the second bearing 72.

[0071]

As described above, according to the present invention, a rigid partition wall formed in a pot shape without a through-hole and a cylinder having an inner diameter slightly larger than the outer diameter of the cylindrical portion of the partition wall which can be attached to the fluid chamber. A rigid mounting plate having a stepped portion, and a sealing member made of an elastic body which is circumferentially compressed and disposed between the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the mounting plate step portion. Is determined by the outer diameter of the cylindrical portion of the rigid partition and the inner diameter of the step of the rigid mounting plate, and is hardly affected by minute fluctuations in the axial position of the partition and the mounting plate. And, when the gap between the partition and the mounting plate is slightly displaced in the axial direction due to the generation of a gap between the caulked parts during assembly, or when the partition and the mounting plate are corroded or thermally expanded during long-term use. Even if loosening of the fixing occurs, the compression ratio of the seal member is hardly affected, and an advantageous effect of providing a shut-off valve having high airtightness can be provided.

Further, a synthetic resin lid having a bearing arranged at the center is inserted and inserted into the open end of the partition, and the outer periphery of the lid is held between the open end of the partition and the bottom surface of the mounting plate step.
Since the partition is urged in the direction of the mounting plate by the urging means, the bearing on the open end side of the partition can be easily arranged integrally with the lid, and the compression ratio of the seal member is affected by the expansion and contraction of the lid due to a temperature change. And the partition is urged by the biasing means, so the expansion and contraction of the lid due to temperature change does not loosen the assembly of the partition and the mounting plate, and a more reliable shut-off for airtightness This has the advantageous effect that a valve can be provided.

Further, the urging means is formed so as to regulate the relative position of the partition and the stator in the axial direction, and can be changed into a holding portion of the lid to change the axial position of the lid with respect to the mounting plate. Since the circumferential rib-shaped dimension absorbing portion is formed, the relative position of the partition wall and the stator in the axial direction is regulated by the biasing means when the partition wall, the lid, the stator, and the biasing means are assembled. The length of the portion protruding from the stator is regulated, and it is possible to prevent the seal member from being over-compressed due to being compressed in the axial direction and the airtightness from being deteriorated. Also, when assembling,
The protrusion or rib-shaped dimension absorbing part of the lid holding part is selectively deformed by the urging force of the urging means, and does not carry large stress on other parts of the lid or the partition wall. A shut-off valve that can securely clamp the lid between the mounting plate and the open end of the partition wall while maintaining the dimensions, does not deform the entire lid, the bearings disposed on the lid, and the partition wall, and has reliable airtightness and reliable operating characteristics. Can be provided.

Further, since a backup ring for preventing the sealing member from dropping off from the mounting plate step is provided between the stator and the sealing member, the sealing member is deeper than the corner R of the mounting plate cylindrical step. It is possible to insert, and since the protrusion gap can be reduced, when assembling the assembly of the partition wall and the stator and the mounting plate, the seal member is wound around the cylindrical step corner of the mounting plate, This has an advantageous effect that it is possible to prevent cutting into the corner R and to provide a shut-off valve having higher reliability in airtightness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a shut-off valve according to a first embodiment of the present invention in an open state.

FIG. 2 is a sectional view of the shut-off valve during a shut-off operation.

FIG. 3 is a sectional view of the shut-off valve in a closed state.

FIG. 4 is a sectional view of a shut-off valve according to a second embodiment of the present invention in an open state.

FIG. 5A is a perspective view of a lid having a projection in the shut-off valve according to the second embodiment of the present invention. FIG. 5B is a perspective view of a lid having a circumferential rib in the shut-off valve.

FIG. 6 is a sectional view of a conventional shut-off valve in an open state.

[Explanation of symbols]

 43 Excitation coil 46 Stator 47 Partition wall 57, 78 Mounting plate 58 Seal member 55, 76 Rotor 53 Rotating shaft 61 Moving body (valve mechanism) 62, 80 Valve body (valve mechanism) 59 Support frame (biasing means) 72 Support plate ( Urging means) 49, 74 Lid 79 Dimension absorbing part 60 Backup ring

Continued on the front page F term (reference) 3H061 AA02 AA05 BB04 CC18 DD03 EA43 EC25 FC00 GG05 GG12 GG19 3H062 AA02 AA12 BB28 CC01 DD03 DD11 EE06 FF40 GG06 HH02

Claims (4)

[Claims] 1. A stator having an exciting coil, a rigid partition wall disposed coaxially inside the stator and formed in a pan shape without a through hole, and a cylindrical portion of the partition wall which can be attached to a fluid chamber and is outside the cylindrical portion of the partition wall. A rigid mounting plate formed with a cylindrical step portion having an inner diameter slightly larger than the diameter, and an elastic member disposed in a circumferential direction between the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the mounting plate step portion. A shut-off valve comprising a body-made seal member, a rotor disposed inside the partition wall facing the stator, and a valve mechanism disposed on a rotation shaft of the rotor. 2. An urging means for urging the partition wall in the direction of the mounting plate, and a synthetic resin lid fitted on the open end of the partition wall and having a bearing disposed at the center thereof. 2. The shut-off valve according to claim 1, wherein the shut-off valve is held between the open end of the partition and the bottom surface of the step portion of the mounting plate. 3. The urging means is formed so as to regulate the relative position of the partition wall and the stator in the axial direction. The biasing means is deformed into a clamping portion of a lid which is clamped between the open end of the partition wall and the bottom surface of the step portion of the mounting plate. 3. The shut-off valve according to claim 2, wherein a projection or a circumferential rib-shaped dimension absorbing portion capable of changing the axial position of the lid with respect to the mounting plate is formed. 4. A device is provided between a stator and a sealing member,
4. The shut-off valve according to claim 1, further comprising a backup ring for preventing the seal member from falling off from the step portion of the mounting plate.