JP2003247653A - Two-way shutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-way shutoff valve having structure to which the back pressure doesn't applied. <P>SOLUTION: The two-way shutoff valve is mounted on a channel 50 on the upstream side of gas. A valve element 16a is integrally formed with an outside seal part 16b, and attached to the upper opening part of an outer cylinder 15. An end part 161 of the outer seal part 16b is held between a case 10 and a gas meter side attaching seat 51 to shut off the channel 50 from the inside of the outer cylinder 15. An inner cylinder 14 attached to a rotation shaft 13 of a deceleration gear part 12 is mounted inside the outer cylinder 15. Projections are formed on the outer surface of the inner cylinder 14 and helicoid grooves are formed on the inner surface of the outer cylinder 15. When the inner cylinder 14 is rotated according to the rotation of a motor 11, the outer cylinder 15 is moved upward/downward to open and close the valve. When the valve closed condition is changed to the valve opened condition, the gas pressure in the channel 50 is applied to the outer surface of the outer cylinder 15 and offset, so that the pressure doesn't work as the back pressure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional shut-off valve that is movable from a valve open state to a valve closed state and from a valve closed state to a valve open state, and in particular to a gas meter attached to a gas meter or the like. Two-way shutoff valve.

[0002]

2. Description of the Related Art FIGS. 8 to 10 are sectional views of a conventional bidirectional shutoff valve disclosed in Japanese Patent Laid-Open No. 10-038129, FIG. 8 showing a valve open state and FIG. 9 showing a valve closed state. FIG. 10 shows the operation of the valve during the valve opening operation. This bidirectional shutoff valve is attached to a gas meter and shuts off the flow of gas from the upstream flow passage 200 to the downstream flow passage 300.

A permanent magnet 118 and a permanent magnet 11 are attached to a gas meter side mounting seat 123 provided in the upstream flow path 200.
A fixed iron core 104 fixed to 8 and a coil (electromagnet) 1
09 and are attached. From the fixed iron core 104 toward the downstream flow passage 300, the plunger (movable iron core) 10
7 is provided and projects into the upstream flow path 200. The pilot pin 110 is attached to the tip of the plunger 107, and the valve pin 15 is attached to the pilot pin 110.
0 is attached so as to be movable in the axial direction of the pilot pin 110 (vertical direction in FIG. 8).

In the valve open state shown in FIG. 8, the coil 109 is not energized, and the downward magnetic force of the permanent magnet 118 causes the plunger 107 to be attracted through the fixed iron core 104.

When an abnormal gas flow rate or an earthquake is detected in the valve open state, a drive current is applied to the coil 109,
An upward force is applied to the plunger 107 by the magnetic force of the coil 109. As a result, the resultant force of the coil 109 and the upward force of the taper spring 116 overcomes the downward force of the permanent magnet 118, and the plunger 107 moves upward. Then, as shown in FIG. 9, the valve seat 114 of the valve body 150 is pressed against the valve seat 124 by the upward force of the taper spring 116, the gas flow is shut off, and the valve is closed.

In the return operation from the valve closed state, a current in the direction opposite to that at the time of shutoff is applied to the coil 109, and a downward force in the figure is applied to the plunger 107. Then, the downward force overcomes the upward force of the taper spring 116, and as a result, the plunger 107 moves toward the fixed iron core 4 and is attracted to the fixed iron core 4.

At the time of this return, in order to release the back pressure of the gas (the pressure in the gas in the upstream flow passage 200 pushing up the valve body 150), as shown in FIG. Is not displaced, and only the plunger 107 and pilot pin 110 move downward due to the magnetic force of the coil 109. As a result, the gas flows from the gap between the valve body 150 and the pilot pin 110 to the downstream flow passage 300, and the back pressure is released. That is, the valve body 150 has a double valve structure in which the pilot pin 110 and the plunger 107 also form a valve.

After the back pressure is released, the valve body 150 is pressed by the spring 117 and returns to the position when the valve is opened.

[0009]

As described above, the conventional two-way shutoff valve having such a structure has a structure in which the valve body 150 receives back pressure when the valve is closed and the valve is opened. Have. Therefore, in order to release the back pressure, the conventional bidirectional shutoff valve has a double valve structure. Therefore, the valve structure was complicated and the number of parts was increased.

On the other hand, when the double valve structure is not used, it is necessary to move the plunger 107 and the valve body 150 against the back pressure when the valve is closed and the valve is opened. This has led to an increase in the amount of electricity used.

Further, the conventional bidirectional shut-off valve uses the balance between the forces of the taper spring 116 and the magnet 118,
Since the valve was open and closed, it had the property of being vulnerable to external impact. That is, when a shock is applied to the gas meter from the outside (for example, a ball hits the gas meter) while the valve is open, the plunger 107 is separated from the magnet 118 by the shock, and the force of the taper spring 116 causes the valve to close. There was a risk of causing.

Further, since the plunger 107, the valve body 150, and the pilot pin 110 project into the upstream side flow passage 200, the flow of gas in the upstream side flow passage 200 is hindered, resulting in a pressure loss of gas pressure. Was there. In order to reduce the protrusion into the upstream flow path 200, a method of lengthening the valve stroke may be considered. However, if the valve stroke is lengthened, the distance between the fixed iron core 104 and the plunger 107 increases when the valve is closed, and a strong magnetic force is required to restore the plunger 107 from the valve closed state to the valve open state. Therefore, there is a problem that the power consumption of the coil 109 increases.

The present invention has been made in view of such a situation, and an object thereof is to provide a bidirectional shutoff valve having a structure that does not apply back pressure.

Another object of the present invention is to reduce the power consumption required for valve operation.

A further object of the present invention is to provide a bidirectional shutoff valve that does not project into the gas flow path.

Still another object of the present invention is to stabilize the condition of the valve.

[0017]

In order to achieve the above object, in a bidirectional shutoff valve according to the present invention, a cylindrical member is provided on the outer edge of the valve body in the direction of separating the valve body from the valve seat. By sealing the tubular member from the outside, when the valve body is separated from the valve seat, the valve body does not receive back pressure. Further, the bidirectional shutoff valve according to the present invention is provided with a rotating member that is in a helicoidal connection with the tubular member, and has a structure in which the tubular member and the valve body move bidirectionally by rotation of the rotating member.

That is, the bidirectional shutoff valve according to the present invention is
In a bidirectional shut-off valve that moves a valve body in both directions of contacting the valve seat and separating from the valve seat by a motor, in a direction of separating the valve body from the valve seat from the outer edge of the valve body. A cylindrical member having at least one of an inner peripheral surface and an outer peripheral surface forming a cylindrical surface, and a helicoid coupling with the inner peripheral surface or the outer peripheral surface having the cylindrical surface of the cylindrical member to transmit the rotation of the motor. Is attached to the rotary member that rotates about an axis common to the axis of the tubular member and the tubular member or the valve body, and at least shuts the inside of the tubular member from the outside. And a seal member.

According to the present invention, the tubular member is provided from the outer edge of the valve body toward the direction in which the valve body is separated from the valve seat, and the seal member is provided to shut off at least the inside of the tubular member from the outside. Has been. Therefore, when the bidirectional shutoff valve opens (opens) after shutting off (closing) the gas flow path,
The back pressure of gas is not applied to the valve body. As a result, it is not necessary to increase the torque of the motor against the back pressure, and as a result, the driving power of the motor can be reduced. In addition, the number of parts can be reduced without requiring a complicated structure such as a double valve structure for releasing back pressure.

Further, according to the present invention, the rotational movement of the rotary member is converted into the bidirectional movement of the valve body and the tubular member by the helicoid coupling, whereby the valve opening and closing operations are performed. . Therefore, the valve opening and closing operations of the valve element can be performed with a simple configuration of the helicoid connection between the rotating member and the tubular member.

Furthermore, the stroke of the valve can be made equal to the height of the tubular member. As a result, even if the valve element does not project into the gas flow path, etc., the gas flow path is blocked (valve closed).
Can be reliably performed. In addition, since the valve body does not protrude into the gas flow path, etc., it does not disturb the gas flow,
The occurrence of gas pressure loss is also avoided. Furthermore, since the flow path can be made smaller, it also contributes to downsizing of the gas meter.

Further, according to the present invention, since the valve is driven and supported by the motor, the valve state (valve open state, valve closed state, etc.) can be stabilized and malfunction can be prevented.

In the helicoid coupling, (1) the inner peripheral surface or the outer peripheral surface having the cylindrical surface of the cylindrical member has a spiral groove, and the rotating member has a protrusion fitted into the groove, The case where the helicoid coupling is performed by fitting the protrusion in the spiral groove, and (2) the inner peripheral surface or the outer peripheral surface of the cylindrical member having the cylindrical surface has the protrusion, Has a cylindrical shape, and when the protrusion is provided on the inner peripheral surface of the cylindrical member, a spiral groove is provided on the outer peripheral surface of the rotating member, and the protrusion is formed on the outer peripheral surface of the cylindrical member. And a case where a spiral groove is provided on the inner peripheral surface of the rotating member, and the helicoid coupling is performed by fitting the protrusion into the spiral groove, and (3) above. The inner peripheral surface or the outer peripheral surface of the cylindrical member having the cylindrical surface has the first helicoid screw. However, when the rotating member has a cylindrical shape and the first helicoid groove is provided on the inner peripheral surface of the tubular member, a second helicoid screw is provided on the outer peripheral surface of the rotating member, When the first helicoid screw is provided on the outer peripheral surface of the tubular member, a second helicoid screw is provided on the inner peripheral surface of the rotating member,
At least, the case where the helicoid coupling is performed by screwing the helicoid screw and the second helicoid screw.

Preferably, the portion of the spiral groove with which the protrusion engages when the valve is closed is more than the inclination angle of the portion with which the protrusion engages during movement of the valve body and the tubular member. Is also formed with a gentle inclination angle. Further, in the spiral groove, a portion where the protrusion engages when the valve is open is inclined more gently than an inclination angle of a portion where the protrusion engages while the valve body and the tubular member move. It is formed of horns.

Further, preferably, the rotating member has an outer peripheral surface that smoothly contacts the cylindrical inner peripheral surface of the cylindrical member, or an inner peripheral surface that smoothly contacts the cylindrical outer peripheral surface of the cylindrical member. It has a cylindrical shape with a peripheral surface. As a result, the tubular member can be stably moved in its axial direction (that is, the direction in which the valve body contacts the valve seat and the direction in which it separates from the valve seat), and the valve body is moved to each part of the valve seat. It is possible to contact (press contact) with a uniform force.

More preferably, the rotary member has a cylindrical shape, and the whole or part of the motor is housed inside the cylinder of the rotary member. As a result, the bidirectional shutoff valve can be made compact.

The seal member may be formed integrally with the valve body or may be separate from the valve body.

When integrated with the valve body, the sealing member covers the outside of the tubular member from the valve body and has a length such that the valve body and the tubular member can move in both directions. It is attached to a case that houses the valve body and the tubular member.

When separated, one end of the seal member is attached to the other end of the tubular member different from the end on the valve body side, and the other end of the seal member is Attached to the bottom of the case, the length from the one end to the other end of the seal member is set to a length that allows bidirectional movement of the valve body and the tubular member. It

[0030]

FIG. 1 shows a bidirectional shutoff valve 1 according to an embodiment of the present invention. FIG. 1A is a top view, FIG. 1B is a side view, and FIG. Is a bottom view. Figure 2
1A is a sectional view taken along the line AA ′ in FIG. 1A, where FIG. 1A is a sectional view in a valve open state, and FIG. 1B is a sectional view in a valve closed state.
FIG. 3 is an assembly perspective view showing the inner cylinder 14 and the outer cylinder 15 which are the components of the bidirectional shutoff valve 1. 4A and 4B are developed views of the inner surface of the cylinder of the outer cylinder 15.

The bidirectional shutoff valve 1 is provided inside the gas meter and shuts off the upstream flow passage 50 and the downstream flow passage 60 in the gas meter. In the valve open state shown in FIG. 2A, the gas G flows from the upstream flow passage 50 to the downstream flow passage 60. The upstream flow path 50 is a flow path inside the gas meter through which the gas G supplied from a gas pipe buried underground such as a road flows, and the downstream flow path 60 supplies the gas to a building such as a house. This is the flow path inside the gas meter that supplies the gas.

When the microcomputer (not shown) of the gas meter detects an abnormal gas flow rate or an earthquake in the valve open state, the microcomputer activates the bidirectional shutoff valve 1 to close the valve as shown in FIG. 2 (B). To On the other hand, when the restoration process is performed by the user or the like, the microcomputer returns the bidirectional shutoff valve 1 to the valve open state shown in FIG.

The bidirectional shutoff valve 1 includes a case 10 and a motor 1.
1, reduction gear unit 12, rotating shaft 13, inner cylinder 14, outer cylinder 1
5. It has a valve body / external seal 16 in which a valve body and an external seal are integrally formed, and a mounting member 17.

The case 10 is a case for accommodating the constituent parts of the anti-shutoff valve 1. The case 10 has a cylindrical shape including a cylindrical portion 10a and a bottom portion 10b that are integrally formed. The upper end of the cylindrical portion 10a is attached to the attachment member 17, and the motor 11 is attached to the bottom portion 10b.

The mounting member 17 has four screw holes 17a. Corresponding to these screw holes 17a, four screw holes (not shown) are also formed in the gas meter side mounting seat 51. The screw hole 17a and the screw hole of the gas meter side mounting seat 51 are connected by, for example, bolts and nuts. The attachment member 17 is attached to the gas meter side attachment seat 51 by screwing. As a result, the bidirectional shutoff valve 11 is fixed to the gas meter side mounting seat 51.

The motor 12 is, for example, a DC motor. The on / off of the direct current supplied to the motor 12 is controlled by a microcomputer (not shown), which controls the rotation and stop of the motor 12. The rotation shaft (not shown) of the motor 12 has a reduction gear unit 1 via a pinion (not shown) attached to the rotation shaft.
It is engaged with one of two gears (not shown).

The reduction gear unit 12 has a plurality of gears (not shown), one of which is engaged with the pinion of the rotary shaft of the motor 12 as described above, and one of the other gears is the rotary shaft. It is attached to 13. Then, the reduction gear unit 12
Reduces the rotation of the motor 11 and transmits the reduced rotation to the rotating shaft 13.

The inner cylinder 14 is a disk portion 14a formed integrally.
And a cylindrical portion 14b. A hole 14c is provided at the center of the disk portion 14a, and the rotary shaft 13 is inserted and attached to the hole 14c. The outer diameter of the cylindrical portion 14b is slightly smaller than the inner diameter of the outer cylinder 15, and the inner cylinder 14 is
It can be smoothly rotated and moved up and down (moved in the axial direction of the outer cylinder 15).

By adjusting the inner diameter of the cylindrical portion 14b and the outer diameters of the motor 11 and the reduction gear portion 12,
As in this embodiment, the motor 11 and the reduction gear unit 1
2 can be stored in the cylindrical portion 14b. As a result, the height of the bidirectional shutoff valve 1 can be reduced, and as a result, the gas meter can be downsized.

The outer cylinder 15 has a cylindrical shape, and the inner surface of the outer cylinder 15 with respect to the axial direction of the outer cylinder 15 (the vertical direction of FIG. 4A) is shown in the development view of FIG. 4A. A plurality of linear grooves 15a (three in the present embodiment) are formed in a diagonal direction. Since the outer cylinder 15 has a cylindrical shape, these linear grooves 15a are helicoid grooves (spiral grooves).
To form.

On the other hand, as shown in FIG. 3, these three helicoid grooves 15 are formed on the outer peripheral surface of the cylindrical portion 14b of the inner cylinder 14.
The same number of projections 14d that fit into a are provided as the number of helicoid grooves 15a (that is, three).

Therefore, the protrusion 1 is formed in the helicoid groove 15a.
By fitting 4d, helicoid coupling is performed,
When the inner cylinder 14 rotates as the motor 11 rotates, the outer cylinder 15 moves in the axial direction (vertical direction in FIGS. 2 and 3).
It will move smoothly. That is, when the inner cylinder 14 rotates in the direction A of FIG. 3, the outer cylinder 15 rises and the inner cylinder 1
When 4 rotates in the direction B of FIG. 3, the outer cylinder 15 descends.
As described above, the helicoid groove 15a and the protrusion 14d (or the outer cylinder 15 and the inner cylinder 14) form a helicoid coupling and a mechanism that converts the rotational movement of the motor 11 into the vertical movement of the outer cylinder 15.

Incidentally, the protrusion 14d and the helicoid groove 15
The number of a may be a number other than three (one, two, or four or more).

The valve body / external seal 16 is attached so as to cover from the upper opening portion of the outer cylinder 15 to the cylindrical portion. The valve body / external seal 16 includes a valve body portion 16
a and the external seal portion 16b are integrally formed and are made of, for example, an elastic member (rubber or the like).
By integrally forming in this way, the number of parts can be reduced.

The valve body portion 16a is a flat disk-shaped portion that covers the upper opening of the outer cylinder 15. In other words, the valve body 1
An outer cylinder 15 is attached to the outer edge of 6a. Valve body 1
The diameter of 6a (and the outer diameter of the outer cylinder 15) is 6
It is set larger than the inner diameter of 0. As a result, the valve body portion 16a serves as an internal seal in the valve closed state (see FIG. 2B). That is, in the valve closed state,
The valve body portion 16a abuts (presses) the valve seat 52 (the connecting portion between the flow passages 50 and 60) to shut off the upstream flow passage 50 and the downstream flow passage 60, and the gas flows upstream. A seal is provided to prevent leakage from the passage 50 to the downstream passage 60. In order to ensure this sealing, it is preferable that a circumferential projection 160 is provided in the circumferential direction at the portion of the valve body portion 16a that abuts the valve seat 52.

In the outer seal portion 16b, the gas inside the gas meter (upstream flow path 50) is outside the gas meter (motor 1
The inside of the case 10 in which 1 and the like are stored is included. ) Is a seal that shuts off the inside and outside of the gas meter and keeps the gas tight. Therefore, the external seal part 1
6b is extended from the peripheral end portion of the valve body portion 16a to the mounting member 17, and the extended end portion 161 is formed in an O-ring shape to form the mounting member 17 and the gas meter side mounting seat 51. It is pinched.

The outer seal portion 16b covers almost the entire cylindrical portion of the outer cylinder 15 and is then folded back to attach the mounting member 1.
The structure extending to 7 is the valve body 16a.
Since the outer cylinder 15 moves up and down, the length in the up and down direction is secured so as not to interfere with this up and down movement.

Next, the operation of the bidirectional shutoff valve 1 will be described.

As shown in FIG. 2A, when the valve is open,
The outer cylinder 15 is stored in the case 10.

In this valve open state, the height of the valve body 16a is made equal to the height of the gas meter side mounting seat 51 by adjusting the depth of the case 10 and the heights of the inner cylinder 14 and the outer cylinder 15. , Or gas meter side mounting seat 5
The height of the bidirectional shutoff valve 1 is set to be lower than the height of 1
It is possible not to project into 0. As a result, in the valve open state, the gas flow in the upstream flow path 50 is not disturbed by the bidirectional shutoff valve 1, and the gas pressure loss does not occur.

Further, since the bidirectional shut-off valve 1 does not interfere with the gas flow, the inner diameter of the upstream flow passage 50 can be correspondingly reduced, and the gas meter can be miniaturized.

In this valve open state, when the microcomputer detects an abnormal gas flow rate or an earthquake, or when the user closes the valve, the microcomputer supplies the motor 11 with a current that causes the motor 11 to rotate normally. To do. As a result, the motor 11 rotates in the normal direction, and the rotation of the motor is decelerated by the reduction gear unit 12 and then transmitted to the rotating shaft 13 so that the rotating shaft 13 and the inner cylinder 14 rotate in the direction A (see FIG. 3). . As a result, the outer cylinder 15 and the valve body portion 16
a rises and the valve body portion 16a comes into contact with the valve seat 52 (press contact).
However, the bidirectional shutoff valve 1 is in the valve closed state shown in FIG.

As a result, the downstream flow passage 60 is blocked from the upstream flow passage 50, and gas is no longer supplied to the downstream flow passage 60 (ie, inside the building).

As is clear from the operation from the valve open state to the valve closed state, the stroke of the valve can be set to the height of the outer cylinder 15. As a result, as described above, even if the valve body portion 16a is arranged so as not to project into the upstream side flow passage 50 in the valve open state, the height of the outer cylinder 15 is set to the upstream side flow passage 5
By setting the height (width) to be 0 or more, it is possible to surely perform the shutoff when the valve is closed.

When the outer cylinder 15 moves up (and down),
The outer peripheral surface of the inner cylinder 14 guides the outer cylinder 15 so that the moving direction of the outer cylinder 15 does not deviate from the axial direction of the rotating shaft 13 and the inner cylinder 14 (the vertical direction of FIGS. 2A and 2B). Play a role in. As a result, the valve body portion 16a can abut (press) with each part of the valve seat 52 with a uniform force, and high airtightness can be obtained in the valve closed state.

In particular, the bidirectional shut-off valve 1 is not always installed so that the vertical movement direction of the outer cylinder 15 is vertical, and may be installed vertically to the vertical direction. Further, the outer cylinder 15 may receive a force in the lateral direction in FIG. 2 due to the gas flow G. Therefore, in such a case, the inner cylinder 14 is important for stably moving the outer cylinder 15 in the axial direction.

Since the moving distance (rising distance) from the valve open state until the valve body portion 16a contacts the valve seat 52 is known in advance, the microcomputer rotates the motor 11 by the moving distance. So that the motor 1
Energize 1 and then stop energizing.

When a return operation (valve opening operation) is performed by the user or the like in the valve closed state, the microcomputer energizes the motor 11 with a current that causes the motor 11 to rotate in the reverse direction. As a result, the motor 11 rotates in the reverse direction, and the rotation of the motor is decelerated by the reduction gear unit 12 and then transmitted to the rotary shaft 13 so that the rotary shaft 13 and the inner cylinder 14 rotate in the direction B (see FIG. 3). As a result, the outer cylinder 15 and the valve body portion 16
a is lowered, the valve body portion 16a is separated from the valve seat 52, and the bidirectional shutoff valve 1 returns to the valve open state shown in FIG. 2 (A).

During the transition from the valve closed state to the valve open state, the gas pressure in the upstream flow passage 50 is applied to each part of the outer peripheral surface of the outer cylinder 15, but the gas pressure applied to this outer peripheral surface is Cancel each other out. Further, the gas in the upstream flow passage 50 is blocked by the external seal portion 16b and does not enter the outer cylinder 15. Therefore, the gas pressure does not act as a back pressure that prevents the valve body 16a and the outer cylinder 15 from descending. As a result, the motor 11 does not need to generate a torque against the back pressure, and the outer cylinder 11 can be lowered with a small torque, so that the drive power of the motor 11 can be reduced. Moreover, it is not necessary to have a complicated structure like the conventional double valve structure.

Further, when the valve closed state is changed to the valve opened state, the valve body 16a is slightly separated from the valve seat 52, and the valve body 16a
From the gap between the a and the valve seat 52, the gas flows through the upstream flow path 50.
From this, a state occurs in which the flow rapidly flows toward the downstream side flow path 60. Even in such a state, since the bidirectional shutoff valve 1 according to the present embodiment has a structure that does not receive back pressure, there is little risk that the valves (valve body 16a and outer cylinder 15) will shut off again. Further, since it is not necessary to increase the torque of the motor 11 in opposition to the back pressure, it is possible to prevent an increase in drive power.

In both the valve open state and the valve closed state,
Even if an external impact is applied to the bidirectional shutoff valve 1, the valve body 1
Since 6a (and the outer cylinder 15) is supported by the motor 11 (and the reduction gear portion 12), the valve body portion 16a
(And the outer cylinder 15) is not displaced. This prevents malfunction due to external shock.

Next, another embodiment of the present invention will be described.

(1) Other forms of helicoid groove The helicoid groove may have the shape shown in the development view of FIG. 4 (B).

Three helicoid grooves 15 shown in FIG. 4 (B)
Each of b is composed of a first end 151, a displacement portion 152, and a second end 153.

The displacement portion 152 is formed at an angle similar to that of the helicoid groove 15a of FIG. 4A, and when the protrusion 14d of the inner cylinder 14 is engaged with the displacement portion 152, the motor 11
The outer cylinder 15 moves up and down with the rotation of.

The first end 151 is provided at a position where the projection 14d is engaged in the valve open state of FIG. 2 (A). Second
The end portion 153 has the protrusion 14 in the valve closed state of FIG.
It is provided at a position where d is engaged. Both ends 151 and 1
Reference numeral 53 denotes a substantially vertical direction (horizontal direction in FIG. 4B) with respect to the axial direction of the outer cylinder 15 (longitudinal direction in FIG. 4B) or slightly inclined (same as the displacement portion 152). It is formed so as to be inclined in the angular direction) and is connected to the displacement portion 152 via smooth curved portions 151a and 153a, respectively.

At the first end portion 151 and the second end portion 153, the vertical movement amount of the outer cylinder 15 with respect to the rotation amount of the inner cylinder 14 (that is, the motor 11) is smaller than the movement amount of the displacement portion 152. . Therefore, malfunction due to external shock can be prevented more reliably. That is, as described above, the outer cylinder 15 and the valve body portion 16a are supported by the motor 11 and the reduction gear portion 12 and have a structure resistant to impact, but even if a strong impact that rotates the motor 11 is applied. Since the vertical movement amount of the outer cylinder 15 is small, the valve closed state and the valve opened state can be stably maintained.

When the valve is closed and the valve is opened, the gas may suddenly flow into the downstream flow passage 60 through the gap between the valve body 16a and the valve seat 52, as described above. In this case, the valve body portion 16a may be pulled toward the downstream flow passage 60 side by the vortex of the gas generated in the downstream flow passage 60, and a force that returns the outer cylinder 15 to the valve closed state may act.
Even in such a case, the second end 153 (when the valve is closed)
With this structure, the outer cylinder 15 can be prevented from being returned to the valve closed state, and a stable valve opening operation can be performed.

It is to be noted that it is when the valve is closed that the prevention of malfunction due to an external impact is particularly required.
It is also possible to provide only 3 and omit the first end 151. Also, the shapes of the first end 151 and the second end 153 can be sinusoidal. For example, curve part 1
The shape from 51b to the curved portion 151a via the first end 151 can be a sine curve in the range of θ = −π / 2 to π / 2 in sin θ. The same applies to the second end portion 153.

(2) Other Embodiments of External Seal In the above-mentioned embodiment, the valve body portion 16a and the external seal portion 16b are integrally formed, but they may be formed by separate members.

5 to 7 are cross-sectional views of a bidirectional shutoff valve in which the valve body portion and the outer seal portion are individually constructed. The same components as those of the bidirectional shutoff valve 1 shown in FIGS. 1 and 2 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the bidirectional shutoff valve 2 shown in FIG.
The valve body portion 21 is attached to the upper opening of the to seal the upper opening. Thereby, the airtightness of the upper opening of the outer cylinder 15 is maintained. The valve body 21 is made of, for example, an elastic member (rubber or the like), and when the valve is closed, the valve seat 52 (see FIG.
The inner seal is held by abutting (pressing) to (A) and (B).

Between the lower opening of the outer cylinder 15 and the upper end of the bottom 10b of the case 10, the lower opening of the outer cylinder 15 and the upper end of the bottom 10b are surrounded along the circumferential direction of the outer cylinder 15. As described above, the bellows-shaped external seal member 20 that is vertically expandable and contractible is attached.

The outer sealing member 20 on the bellows is made of, for example, an elastic member (rubber or the like), and is kept airtight by the main body 20a and the mounting portions 20b and 20c. That is, the gas in the upstream flow path 50 enters the gap between the outer cylinder 15 and the case 10, but the entered gas is blocked by the external seal member 20, and the outer cylinder 15 is blocked.
Gas is prevented from entering the interior of the. Further, since the external seal member 20 has a bellows shape, the outer cylinder 15 can be moved up and down.

In this bidirectional shutoff valve 2, case 1
No. 0 cylindrical portion 10a and bottom portion 10b are formed by separate members, and an O-ring 23 is fitted between the cylindrical portion 10a and the bottom portion 10b in order to maintain an external seal between the cylindrical portion 10a and the bottom portion 10b. In addition, the cylindrical portion 10a and the gas meter side mounting seat 51
O ring 24 for holding the external seal between
Is provided. Furthermore, in this bidirectional shutoff valve 2,
A structure is adopted in which the motor 11 and the reduction gear portion 12 are fixed to the motor mounting member 10c mounted on the bottom portion 10b.

In the bidirectional shutoff valve 3 shown in FIG. 6, the bellows-shaped outer seal member 20 shown in FIG. 5 is recessed toward the inner side of the outer cylinder 15 in a generally V-shaped cross section. Has become. The other configuration is the same as that of the bidirectional shutoff valve 2 shown in FIG. The outer cylinder 15 can also be moved up and down by the outer seal member 30, and the outer seal is held.

In the bidirectional shutoff valve 4 shown in FIG.
An outer seal member 40 is provided, which is recessed inward in the shape of a cross-section substantially "Ω (omega)". The other configuration is the same as that of the bidirectional shutoff valve 2 shown in FIG. The outer cylinder 15 can also be moved up and down by the outer seal member 40, and the outer seal is held.

The shape of the external seal member is not limited to the three shapes shown in FIG. 5 to FIG.
Other shapes that allow vertical movement of 5 and retain the outer seal are within the scope of the invention.

(3) Other forms The outer shape of the outer cylinder 15 may be other than the cylindrical shape, and may be another shape capable of canceling out gas pressures, for example, a polygonal cylindrical shape. This also prevents the back pressure of the gas. Along with this, the valve body portion 16a or 21 may have a shape other than a circular shape, for example, a polygonal shape.

The outer cylinder 1 attached to the rotary shaft 13
The one for moving 5 up and down is not limited to a cylindrical one such as the inner cylinder 14, but is, for example, a disc-shaped member having only the disc portion 14a, or a triangular plate-shaped member having three vertices corresponding to the protrusions 14d. May be However, as described above, in order to stably move the outer cylinder 15 up and down in the axial direction, it is preferable that the thing attached to the rotary shaft 13 and vertically moving the outer cylinder 15 has a cylindrical shape.

Further, a helicoid groove may be formed on the outer peripheral surface of the inner cylinder 14 and a protrusion may be provided on the inner surface of the outer cylinder 15.

Further, the valve body is provided above the inner cylinder 14, and the inner cylinder 14 is not rotated by the motor 11, but the driving force of the motor 11 is transmitted to the outer cylinder 15 to rotate the outer cylinder 15. The inner cylinder 14 may be moved up and down. In this case, the outer cylinder 15 may have an annular shape (ring shape) as well as a cylindrical shape.

Further, instead of forming the helicoid coupling by the helicoid groove and the protrusion, helicoid screws are formed on both the outer peripheral surface of the inner cylinder 14 and the inner peripheral surface of the outer cylinder 15, and these helicoid screws are screwed together. By doing so, a helicoid bond can be formed.

[0084]

According to the present invention, the back pressure of gas is not applied to the valve body. As a result, it is not necessary to increase the torque of the motor against the back pressure, and as a result, the driving power can be reduced. In addition, the number of parts can be reduced without requiring a complicated structure such as a double valve structure for releasing back pressure.

Further, according to the present invention, the rotating member (inner cylinder)
The simple structure of the helicoid connection between the cylinder and the tubular member (outer cylinder) enables the valve body to open and close.

Further, according to the present invention, the stroke of the valve can be made equal to the height of the cylindrical member (outer cylinder).
As a result, even if the valve body is not projected into the gas flow path,
It is possible to reliably shut off (close the valve) the gas flow path. Further, since the valve body does not project into the gas flow path or the like, the gas flow is not disturbed, and the occurrence of gas pressure loss is avoided. Furthermore, since the flow path can be made smaller, it also contributes to downsizing of the gas meter.

[Brief description of drawings]

FIG. 1 shows a bidirectional shutoff valve according to an embodiment of the present invention, (A) is a top view, (B) is a side view, and (C) is a bottom view.

2 is a sectional view taken along the line AA ′ of FIG. 1 (A), (A) is a sectional view in a valve open state, and (B) is a sectional view in a valve closed state.

FIG. 3 is an assembled perspective view showing an inner cylinder and an outer cylinder which are components of the bidirectional shutoff valve.

4A and 4B are developed views of the inner surface of the cylinder of the outer cylinder.

FIG. 5 is a cross-sectional view of a bidirectional shutoff valve in which a valve body portion and an external seal portion are individually configured.

FIG. 6 is a cross-sectional view of a bidirectional shutoff valve in which a valve body portion and an external seal portion are individually configured.

FIG. 7 is a cross-sectional view of a bidirectional shutoff valve in which a valve body portion and an external seal portion are individually configured.

FIG. 8 is a sectional view showing a configuration of a conventional bidirectional shutoff valve.

FIG. 9 is a cross-sectional view showing a configuration of a conventional bidirectional shutoff valve.

FIG. 10 is a cross-sectional view showing a configuration of a conventional bidirectional shutoff valve.

[Explanation of symbols]

1 bidirectional shutoff valve 11 motor 12 Reduction gear unit 13 rotation axis 14 Inner cylinder 14d protrusion 15 Outer cylinder 16 valve body and external seal 16a, 21 valve body 16b External seal part 15a, 15b Helicoid groove 20, 30, 40 External seal member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazumi Onui             9-10 Misonodai, Fujisawa, Kanagawa Japan             Rideflow Co., Ltd. F term (reference) 3H062 AA02 AA12 BB04 BB10 BB28                       BB30 CC01 DD03 EE06 HH02

Claims (11)

[Claims] 1. A bidirectional shut-off valve in which a motor moves the valve body in both directions of contacting the valve seat and separating from the valve seat, wherein the valve body is moved from the valve seat to the outer edge of the valve body. A tubular member that is provided in the direction of separating and has at least one of the inner peripheral surface and the outer peripheral surface forming a cylindrical surface, and the inner peripheral surface or the outer peripheral surface having the cylindrical surface of the cylindrical member is helicoid-bonded, A rotary member that rotates about an axis common to the axis of the tubular member when the rotation of the motor is transmitted, and a rotary member attached to the tubular member or the valve body, and at least the inside of the tubular member. A two-way shut-off valve having a seal member for shutting off from the outside. 2. The cylindrical member according to claim 1, wherein an inner peripheral surface or an outer peripheral surface having a cylindrical surface of the cylindrical member has a spiral groove, and the rotating member has a protrusion fitted into the groove, A bidirectional shutoff valve, wherein the helicoid coupling is performed by fitting the protrusion in a spiral groove. 3. The cylindrical member according to claim 1, wherein an inner peripheral surface or an outer peripheral surface of the cylindrical member having a cylindrical surface has a protrusion, the rotating member has a cylindrical shape, and the protrusion has an inner diameter of the cylindrical member. When it is provided on the peripheral surface, a spiral groove is provided on the outer peripheral surface of the rotating member, and when the protrusion is provided on the outer peripheral surface of the tubular member, the spiral groove is provided on the inner peripheral surface of the rotating member. A two-way shutoff valve, characterized in that a groove is formed, and the helicoid coupling is performed by fitting the protrusion into the spiral groove. 4. The portion of the spiral groove according to claim 2, wherein the protrusion engages when the valve is closed.
A two-way shutoff valve, wherein the valve body and the tubular member are formed with an inclination angle that is gentler than an inclination angle of a portion with which the protrusion is engaged during movement. 5. The spiral groove according to claim 2, wherein a portion of the spiral groove to which the protrusion engages when the valve is open is provided while the valve body and the tubular member are moving. A two-way shutoff valve, characterized in that it is formed with an inclination angle that is gentler than the inclination angle of the portion with which the projection engages. 6. The cylindrical member according to claim 1, wherein an inner peripheral surface or an outer peripheral surface of the cylindrical member having a cylindrical surface has a first helicoid screw, and the rotating member has a cylindrical shape. When the groove is provided on the inner peripheral surface of the tubular member, a second helicoid screw is provided on the outer peripheral surface of the rotating member, and the first helicoid screw is provided on the outer peripheral surface of the tubular member. In this case, a second helicoid screw is provided on the inner peripheral surface of the rotating member, and the helicoid coupling is performed by screwing the first helicoid screw and the second helicoid screw together. A characteristic bidirectional shutoff valve. 7. The rotating member according to claim 1, wherein the rotating member smoothly contacts the cylindrical inner peripheral surface of the tubular member or the cylindrical outer peripheral surface of the cylindrical member. A two-way cutoff valve having a cylindrical shape with an inner peripheral surface that 8. The bidirectional shutoff valve according to claim 1, wherein the rotary member has a cylindrical shape, and the whole or a part of the motor is housed inside the cylinder of the rotary member. 9. The bidirectional shutoff valve according to claim 1, wherein the seal member is formed integrally with the valve body. 10. The valve assembly according to claim 9, further comprising a case for accommodating the valve body and the tubular member when the valve is opened, wherein the sealing member covers the valve body from the outside of the tubular member. A bidirectional shutoff valve having a length that allows bidirectional movement of a body and the tubular member, and being attached to the case. 11. The method according to claim 1, further comprising a case for accommodating the valve body and the cylindrical member when the valve is opened, wherein one end of the seal member is the tubular member. Is attached to the other end different from the valve body side end, and the other end of the seal member is attached to the bottom of the case, from the one end to the other end of the seal member. The length of the two-way shutoff valve is set so that the valve body and the tubular member can move in both directions.