KR20040031615A - Cutoff valve and cutoff valve block equipped therewith - Google Patents

Abstract

PURPOSE: A cut-off valve and a cut-off valve block embedding the cut-off valve are provided to obtain proper valve-closing airtightness even if enlarging the diameter of a valve body to correspond to the large quantity of fluid by reducing the gradient of the valve body. CONSTITUTION: A cut-off valve is composed of a valve body(43) for moving to open and close a passage(41) and having a through-hole; a valve seat(42) pressurized with the valve body to close the passage and fixed and disposed in the passage; a first spring(49) for pressurizing the valve body to the valve seat; a valve shaft(45) with the thickness blocking up the through-hole; a pin(45a) integrally formed at one end of the valve shaft, inserted into the through-hole from the opposite side of the valve seat, and formed with a bypass passage between the pin and the through-hole; a second spring for pressurizing the valve shaft toward the valve seat; a guide unit(48) for guiding a movement of the valve shaft; a rotary driving mechanism(55) disposed oppositely to the valve seat of the valve body; a transfer unit(60) installed at an output shaft(59) of the rotary driving mechanism; a movable body(61) for pressurizing and operating the pin and the valve body and having a central hole thread-combined to the transfer unit; and a rotation preventing unit(64) for restricting the rotation of the movable body.

Description

Shutoff valve and shutoff valve block with built-in shutoff valve {CUTOFF VALVE AND CUTOFF VALVE BLOCK EQUIPPED THEREWITH}

The present invention relates to a gas shutoff valve for preventing a gas accident and a block in which the shutoff valve is incorporated.

The conventional shut-off valve described in Unexamined-Japanese-Patent No. 1999-2352 is shown in FIG. Hereinafter, a conventional shutoff valve will be described with reference to FIG. 5.

A stator 4 is attached to the outer circumference of the cup-shaped casing 6 with a jaw attached, and an outer bush 3 made of synthetic resin is fitted to the opening of the casing 6. The stud 5 is eccentric by integrally molding to the outer bush 3 and protrudes forward. An inner bush 12 is inserted into the casing 6. The lead screw 17 is rotatably supported in the forward and reverse directions by the outer bush 3 and the inner bush 12 in a state where the male screw portion 17a at the tip thereof projects forward from the outer bush 3. have. In addition, a rotor 16 is attached to a lead screw 17 in a manner opposite to the stator 4. A thrust load rolling bearing 18 is interposed between the rotor 16 and the outer bush 3. The valve body 25 is coupled to the stud 5 and screwed to the male screw portion 17a. The elastic sealing member 8, the outer bush 3, and the casing 6 are sandwiched between the stepped flange 2 and the flat flange 7. The stepped flange 2 and the flat plate flange 7 are fixed by the caulking part 32 by caulking. In addition, the outer side of the caulking portion 32, the elastic sealing member 33 is sandwiched between the stepped flange 2 and the housing 27, the airtight between the stepped flange 2 and the housing 27 Keeping up. The shut-off valve thus configured is usually arranged in the gas meter so that the lead screw 17 is in the horizontal direction.

The operation | movement is demonstrated below about the shutoff valve comprised as mentioned above.

When abnormal gas is used, the rotor 16 is rotated forward by energization from a control unit (not shown). In response to the rotation, the lead screw 17 rotates in the forward direction. At this time, when the stud 5 restrains the rotation of the valve body 25, the rotational motion is converted into a linear motion. Then, the valve body 25 advances from the lead screw 17 side to the valve seat 26 side and contacts the valve seat 26. In other words, the valve body 25 closes the fluid path to block the fluid.

In addition, when restoring this, the lead screw 17 is rotated in the reverse direction by an external input. At this time, when the stud 5 restrains the rotation of the valve body 25, the rotational motion is converted into a linear motion. And the valve body 25 retreats from the valve seat 26 side to the lead screw 17 side. It retracts until the end part of the valve body 25 contacts the outer bush 3, and the fluid path is opened.

In recent years, the battery energy mounted in a microcomputer-mounted gas meter enables the gas flow path to be shut off and returned, and the convenience of a shut-off valve that does not require energy in the valve opening and closing states makes it possible to use a larger capacity for business purposes. It is expected to be mounted in gas meter of.

In a large flow meter, in order to reduce the pressure loss when the large flow rate passes, the valve seat diameter, that is, the outer diameter of the valve body, and the distance between the valve body and the valve seat when the valve is opened, that is, the valve stroke, are measured. It is necessary to set large.

However, in the conventional shut-off valve, the valve body 25 is held only at the male screw portion 17a of the lead screw 17. Therefore, when the outer diameter of the valve body 25 is made large, the eccentric moment by the mass concentrates in the engagement part with the male screw part 17a. For this reason, a large frictional force such as inhibiting rotation of the rotor 16 is generated. In addition, since the male screw portion 17a moves the valve body 25 smoothly, a large gap is necessary between the male screw portion 17a and the valve body 25 to some extent. Because of this gap, the valve body 25 is inclined, and the angle difference with the valve seat 26 becomes large, and sufficient valve closing airtightness may not be obtained.

The present invention allows for such a conventional problem.

The shutoff valve of the present invention,

A valve body configured to be movable to open and close a flow path, and having a through hole,

A valve seat pressurized to close the flow path, the valve seat being fixedly disposed in the flow path,

A first spring for pressurizing the valve body toward the valve seat;

A valve shaft with a thickness blocking the through hole of the valve body,

A pin integrally formed at one end of the valve shaft and inserted into a through hole of the valve body from an opposite side of the valve seat to form a bypass flow path in a gap with the through hole;

A second spring for pressing the valve shaft in the valve seat direction;

A guide part for guiding the movement of the valve shaft;

A rotation drive mechanism disposed opposite the valve seat side of the valve body;

A conveying means arranged on an output shaft of the rotary drive mechanism,

Pressurizing the pin and the valve body, the center hole of which has a movable body screwed or coupled to a conveying means;

· Anti-rotation means for regulating the rotation of the moving body.

The shutoff valve block of the present invention is configured by integrating the shutoff valve.

1 is a cross-sectional view of the valve closed state of the shutoff valve of Embodiment 1 of the present invention;

2 is a cross-sectional view of a state in which the shutoff valve operates to open the bypass flow path;

3 is a sectional view of a valve open state of the shutoff valve;

4 is a cross-sectional view of the valve open state of the shutoff valve of Embodiment 2 of the present invention;

5 is a cross-sectional view of a valve open state of a conventional shutoff valve.

<Explanation of symbols for the main parts of the drawings>

41 gas passage 42 valve seat

43: valve body 45, 71: valve shaft

48, 72: guide 49: main spring

55: stepping motor 59: output shaft

60: feed screw 61: moving body

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described using drawing.

Example 1

1 is a cross-sectional view of a valve closed state of a shutoff valve of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a bypass flow path open state, and FIG. 3 is a cross-sectional view of a valve open state. Hereinafter, this embodiment will be described with reference to FIGS. 1 to 3.

The shutoff valve of this embodiment,

A valve seat 42 provided in the gas passage 41,

A valve body 43 provided upstream of the flow path 41, capable of opening and closing the flow path 41 with the valve seat 42, and having a through hole in the center thereof;

A valve shaft 45 thicker than the diameter of the through hole of the valve body 43,

A pin 45a which is formed integrally with the valve shaft 45 and whose diameter is sufficiently thinner than the diameter of the through hole of the valve body 43 and passes through the through hole of the valve body 43;

A spring support part 50 formed integrally with the tip of the pin 45a,

A sub spring 47 for pressing the valve shaft 45 against the valve body 43 at no load;

A guide 48 provided so that the valve shaft 45 moves linearly,

A main spring 49 for pressing the valve body 43 to the valve seat 42 side;

A stepping motor 55, which is a rotational drive mechanism disposed opposite the valve body 43, downstream of the flow passage 41 from the valve seat 42;

A feed screw 60, which is a feed means disposed on the output shaft 59 of the stepping motor 55,

A movable body 61 whose center hole is screwable or coupleable to the feed screw 60 and which can pressurize the valve body 43,

It is comprised by the rod 64 which is a rotation prevention means which restricts rotation of the movable body 61. As shown in FIG.

Usually, gas flows in from the inlet 41a and flows out from the outlet 42b via the gas passage 41. The valve seat 42 is a metal cutting product, and is bonded to and fixed in the gas passage 41. The valve body 43 is flexible synthetic rubber or the like. The valve shaft 45 is made of metal. The guide 48 is made of sheet metal treated with coating, plating or the like of polytetrafluoroethylene, or made of synthetic resin such as polyacetal. Between the valve shaft 45 and the guide 48, a minute gap of about 1/100 of the diameter of the valve shaft 45 is provided. The guide 48 is fitted to the flange 65, and the flange 65 is fixed to the gas passage 41 through the sealing member 66. The main spring 49 is a coil spring made of stainless steel or the like, and is arranged in a compressed state between the valve body 43 and the flange 65.

The stepping motor 55 is comprised from the rotor 52 in which the permanent magnet 51 is arrange | positioned, and the stator 53 which opposes the rotor 52. The coil 54 is configured in the stator 53. Between the rotor 52 and the stator 53, a partition 56 made of nonmagnetic metal such as austenitic stainless steel is disposed. The sealing member 57 is arrange | positioned between the partition 56 and the flange 67, and is sealed so that gas may not flow out. In addition, the flange 67 is fixed to the gas passage 41 through the sealing member 68. The output shaft 59 of the rotor 52 is rotatably supported by a bearing 58 and a lid 63 fixed to the partition wall 56. The feed screw 60, which is a feed means, is formed by cutting or rolling on one end of the output shaft 59. The rod 64, which is an anti-rotation means, is formed integrally with the lid 63. The movable body 61 is made of synthetic resin in which a female screw is formed in the center hole and the coupling portion 69 is provided on the outer circumference. The moving body 61 is screwed to the feed screw 60, and is coupled to the rod 64, and is arrange | positioned. The movable body 61 has its one end pressurizing actuating part 62 in contact with the valve body 43, and at the time of valve opening, as shown in FIG. 1, between the pressurizing actuating part 62 and the valve body 43. It is configured so that a slight gap occurs in the. It is preferable that the material of the moving body 61 has high resistance to creep deformation, such as polyphenylene sulfide. Further, flanges 41c and 41d are formed at the inlet 41a and the outlet 41b of the gas passage 41 so as to be connected to the gas passage of the gas meter.

Next, the operation and action of the shutoff valve of the first embodiment will be described. In the valve closed state shown in FIG. 1, the moving body 61 is retracted to the position which contacts the cover 63, and there exists a clearance between the pressurizing operation part 62 and the spring support part 50. As shown in FIG. The valve body 43 is pressed by the main spring 49 to contact the valve seat 42 and maintains a valve closed state where gas does not flow. Since the gap between the valve shaft 45 and the guide 48 is about 1/100 of its diameter, the inclination of the valve body 43 is small, and the valve body 43 is pressed evenly by the main spring 49. Under load. For this reason, sufficient valve closing airtightness can be obtained even when the diameter of the valve body 43 is increased in order to cope with a large flow rate.

When the controller of the gas meter equipped with the microcomputer determines that the danger can be recovered by returning the signal from various sensors, or when the gas user recovers the dangerous state and operates the return switch installed on the meter or the remote control panel, When a gas supplier or the like has sent a remote return command by communication, a control unit (not shown) of a microcomputer-equipped gas meter applies a pulsed phase current having a phase difference to the two-phase coil 54, so that the rotor ( 52). In this way, the moving body 61 moves to the valve body 43 side by the feed screw 60, the pressurizing actuation part 62 contacts the spring support part 50, and as shown in FIG. The axis moves. In the state shown in FIG. 2, gas flows through the bypass flow path 46 formed in the space between the through-hole of the valve body 43, and the pin 45a. By rotating the rotor 52 again from the state of FIG. 2, as shown in FIG. 3, the valve body 43 is separated from the valve seat 42, so that a large amount of gas can flow.

Here, since the movable body 61 is lightweight and is comprised separately from the valve body 43, the eccentric moment by the mass of the valve body 43 does not act on the engagement part with the feed screw 60. As shown in FIG. Therefore, the rotor 52 can perform smooth rotational motion. In addition, even when the diameter of the valve body 43 is increased in order to cope with the large flow rate, the rotation of the stepping motor 55 is hardly inhibited.

In addition, when the state of use of the gas is not abnormal and the signals from the various sensors do not indicate a danger, the control unit of the microcomputer-mounted gas meter does not energize the coil 54, but the control torque of the stepping motor 55 is maintained. The rotor 52 does not rotate by this. That is, the valve body 43 maintains the valve opening state shown in FIG. 3 in the non-power state.

In addition, when the state of use of the gas is abnormal or when signals from various sensors indicate danger, the control unit of the microcomputer-mounted gas meter applies a pulsed phase current having a phase difference to the coil 54 to operate the rotor 52. It rotates in reverse and the moving body 61 retreats to the cover 63 side. Then, the valve body 43 is pressed by the main spring 49 to contact the valve seat 42, and the valve body 43 is in a valve closed state in which gas shown in FIG. 1 does not flow.

Also at this time, since the clearance between the valve shaft 45 and the guide 48 is minute, the inclination of the valve body 43 is small, there is no lock with the guide 48, and smoothly moves to the valve closing position, The valve can be closed.

Since the shutoff valve block including the gas passage 41 has been previously confirmed by the shutoff valve manufacturer for performance or airtightness test, the shutoff valve block is simply incorporated in the gas meter gas passage as it is. Quality shutoff valves can be provided.

As is apparent from the above description, according to the present embodiment, the valve shaft 45 and the guide 48 merely perform a linear sliding motion, and the gap between the valve shaft 45 and the guide 48 is transferred by a lead screw or the like. In the case of appliances, it can be made smaller. As a result, the inclination of the valve body 43 can be made small, and sufficient valve closing airtightness can be acquired even if the diameter of the valve body 43 is enlarged in order to respond to a large flow volume.

In addition, since the rotation drive mechanism is a stepping motor 55 and the valve can be held open by the holding torque of the stepping motor 55, a simple and inexpensive shutoff valve can be provided. In addition, since the shutoff valve block incorporates the shutoff valve of the above structure into a part of the gas passage 41 including the valve seat 42, the shutoff valve block is embedded in a part of the flow path when the gas meter is manufactured. It is possible to add a shutoff valve function simply by making it simple, and at the same time, it is possible to provide a shutoff valve of stable quality because the functional inspection can be performed at the same time as the shutoff valve block separately.

Although the valve seat 42 is said to be adhered to the gas passage 41, the valve seat 42 may be machined to a part of the gas passage 41, and the guide 48 may be machined to a part of the flange 65. Alternatively, instead of using the guide 48 as a sheet metal made by coating, plating, or the like of polytetrafluoroethylene, the same treatment may be performed on the valve shaft 45 side. The pressurization actuating part 62 may be a different part from the moving body 61, and the conveying means may be a cam mechanism other than the conveying screw 60.

In addition, although the rotation drive mechanism was called the stepping motor 55, what is necessary is just a rotation drive mechanism with strong holding torque, such as a geared motor. However, in consideration of economics, a stepping motor is preferable.

Example 2

Fig. 4 is a sectional view of the valve open state of the shutoff valve according to the second embodiment of the present invention. The difference from Embodiment 1 is that the self-maintaining electromagnetic solenoid 78 is formed at the end opposite to the valve body 43 of the valve shaft 71. In the drawing, the guide 72 is disposed on the outer circumference of the valve shaft 71, the coil 75 is disposed on the outside thereof, and the fixed iron core 74 is disposed to be in contact with the end of the valve shaft 71. The magnetic circuit is constituted by the permanent magnet 73, the yokes 76 and 77, and the valve shaft 71. As shown in FIG. The self-holding electromagnetic solenoid 78 is formed by the valve shaft 71, the guide 72, the coil 75, the iron core 74, the permanent magnet 73, and the yokes 76 and 77. The valve shaft 71 is made of magnetic material such as electromagnetic stainless steel. The guide 72 is made of nonmagnetic metal such as austenitic stainless steel net.

The self-holding electromagnetic solenoid 78 is fixed to the flange 81, and the flange 81 is fixed to the gas passage 41 via the sealing member 66. Sealing members 79 and 80 are disposed between the guide 72 and the flange 81 and between the guide 72 and the fixed iron core 74, respectively, so that the gas does not flow out. In addition, the same code | symbol as Example 1 has the same structure, and description is abbreviate | omitted.

Next, the operation and action of the shutoff valve of the second embodiment will be described. In the valve open state shown in FIG. 4, driving power is not supplied to both the self-holding electromagnetic solenoid 78 and the stepping motor 55. The valve shaft 71 is attracted by the magnetic flux of the permanent magnet 73 and is in contact with the fixed iron core 74. The valve body 43 is in the valve open state away from the valve seat 42. The moving body 61 is retracted to the position which contacts the lid 63.

When the use state of the gas is abnormal or when signals from various sensors indicate a danger, the control unit of the microcomputer-mounted gas meter controls the magnetic flux of the permanent magnet 73 to the coil 75 of the self-maintaining electromagnetic solenoid 78. Applies a pulsed current that generates magnetic flux in the reverse direction. As a result, the attraction force between the valve shaft 71 and the magnet 73 decreases, and the valve shaft 71 is pressed against the main spring 49 to be separated from the fixed iron core 74. That is, the valve body 43 moves to the valve seat 42 side, contacts the valve seat 42, and closes the gas passage 41.

At this time, the applied pulsed current may be a square pie of about 50 ms, and the valve closing operation is completed in a short time. That is, even when emergency valve closing is necessary, a stable valve closing operation can be performed at high speed. In the valve closing state, the movable body 61 is retracted to a position where the lid 63 is in contact with the lid 63, and there is a gap between the valve bodies 43. The valve body 43 is pressed by the main spring 49 to contact the valve seat 42 and maintains a valve closed state in which gas does not flow.

Gas supply when the controller of the microcomputer-mounted gas meter determines that the danger is cleared and can be recovered from the signals of various sensors, or when the gas user recovers the dangerous state and operates the return switch installed on the instrument or the remote control panel. When a supplier or the like sends a remote return command by communication, the control unit of the microcomputer-mounted gas meter supplies a pulsed phase current having a phase difference to the two-phase coil 54 of the stepping motor 55, and the rotor 52 Rotate). Then, it is sent to the feed screw 60, and the moving body 61 moves to the valve body 43 side. As in the first embodiment, the valve shaft 71 first moves, and then the valve body 43 moves away from the valve seat 42. In addition, by rotating the rotor 52, the valve shaft 71 is attracted to the magnetic flux by the permanent magnet 73 and is held by the fixed iron core 74. And gas can be distributed.

Thereafter, the control unit of the microcomputer-mounted gas meter applies the pulsed current having the reverse phase difference to the two-phase coil 54 of the stepping motor 55 to rotate the rotor 52 in reverse. Then, it is sent to the feed screw 60, the moving body 61 moves to the side which falls from the valve body 43, retreats to a position which contacts the lid 63, and stops. And it will be in the valve open state shown in FIG.

Thus, since the shutoff valve of Example 2 of this invention arrange | positions the self-maintaining electromagnetic solenoid 78 at the opposite end to the valve body 43 of the valve shaft 71, since the valve closing operation is completed in a short time, Even in the case where emergency valve closing is necessary, a stable valve closing operation can be performed at high speed. In addition, even when the diameter of the valve body 43 is increased in order to cope with the large flow rate, the eccentric moment by the valve body 43 can be supported by the guide 72, so that the load of the main spring 49 can be properly applied. By just setting, sufficient valve closing airtightness can be obtained.

3, although the permanent magnet 73 is shown so that it may be between the fixed iron core 74 and the yoke 76, it can be arrange | positioned between the yoke 76 and the yoke 77, and also the valve shaft ( Although 71) has been described to function as a movable iron core, the movable iron core may be fitted with the valve shaft by other parts.

As described above, according to the present invention, the following effects can be obtained.

Since the valve body is held by the valve shaft and the guide, the eccentric moment due to the mass of the valve body is not applied to the rotation drive mechanism, and even when the diameter of the valve body is increased to cope with the large flow rate, It does not inhibit rotation and the output shaft of the rotary drive mechanism provided opposite the valve shaft first pushes the valve shaft out of the valve body, thereby opening the bypass flow path and lowering the back pressure. In addition, since the valve shaft and the guide only perform linear sliding motions, the gap between the valve shaft and the guide can be made smaller than in the case of a transfer mechanism such as a lead screw. As a result, the inclination of the valve body can be reduced, and sufficient valve closing airtightness can be obtained even when the diameter of the valve body is increased in order to cope with a large flow rate.

In addition to the above-described configuration, the shutoff valve of the present invention has a self-holding solenoid disposed at an end opposite to the valve body of the valve shaft, so that only the valve opening operation is performed by the rotation drive mechanism, and the self-holding solenoid is sucked and held. Afterwards, the movable body on the side of the rotary drive mechanism is retracted to a position which does not contact the valve body when the valve is closed, and the valve closing operation is performed by releasing the adsorption of the self-maintaining electromagnetic solenoid to move the valve body by the pressing force of the spring. It is possible to perform a stable valve closing operation at high speed even when emergency valve closing is required.

Further, since the valve opening can be maintained by the holding torque of the stepping motor, a simple and inexpensive shutoff valve can be provided.

In addition, when manufacturing a gas meter, it is possible to add a shutoff valve function simply by embedding a shutoff valve block in a part of the flow path, simplifying the manufacturing process and performing a functional inspection with a single shutoff valve block. It is possible to provide a shut-off valve of stable quality.

According to the present invention, the inclination of the valve body can be reduced, and sufficient valve closing airtightness can be obtained even when the diameter of the valve body is increased in order to cope with a large flow rate.

In addition, even when emergency valve closing is required, a stable valve closing operation can be performed at high speed, and a simple and inexpensive shutoff valve can be provided.

Claims (6)

In the shutoff valve, A valve body configured to be movable to open and close a flow path, and having a through hole, A valve seat for pressurizing the valve body to close the flow path, the valve seat being fixedly disposed in the flow path; A first spring for urging the valve body toward the valve seat; A valve shaft having a thickness blocking the through hole, A pin integrally formed at one end of the valve shaft, inserted into the through hole from an opposite side of the valve seat, and forming a bypass flow path between the through holes; A second spring for urging the valve shaft in the valve seat direction; A guide part for guiding the movement of the valve shaft; A rotation drive mechanism disposed opposite the valve seat side of the valve body; Transfer means disposed on an output shaft of the rotation drive mechanism; Pressurizing the pin and the valve body, the center hole of which has a movable body screwed or coupled to the conveying means; It includes a rotation preventing means for regulating the rotation of the movable body Shut-off valve. The method of claim 1, A spring support is integrally formed at the distal end of the pin, and the second spring is disposed between the spring support and the valve body. Shut-off valve. The method of claim 1, The valve body is provided upstream of the flow path than the valve seat. Shut-off valve. The method of claim 1, And further comprising a self-maintaining solenoid which sucks the spindle in a direction opposite to the valve seat. Shut-off valve. The method of claim 1, The rotary drive mechanism is a stepping motor Shut-off valve. Integrating the shut-off valve according to any one of claims 1 to 5 Shut-off valve block.