JP5078716B2 - Gas shut-off valve - Google Patents

Description

  The present invention relates to a gas cutoff valve, and more particularly to a gas cutoff valve that shuts off the supply of gas when an abnormality such as gas leakage occurs.

  Conventionally, as a gas shut-off valve, there is provided a valve body portion having a built-in shut-off valve connected to a gas pipe for supplying and shutting off gas, and a valve drive portion having a built-in drive mechanism for driving the shut-off valve of the valve body portion. There is something to prepare. For example, the drive shaft of the valve drive unit and the driven shaft of the shut-off valve are connected, and the shut-off valve is rotated by a valve drive motor or the like of the valve drive unit.

  FIG. 4 is a view showing an example of a conventional gas shut-off valve, and FIG. 4 (B) is a cross-sectional view taken along the line BB of FIG. 4 (A). A valve drive unit 20 incorporating a drive mechanism 30 is attached to the valve body unit 10. The drive mechanism 30 has a drive shaft 30a protruding toward the valve body 10 and is connected to a driven shaft 10a of a shut-off valve (not shown) in the valve body 10. The large gear 30b attached to the drive shaft 30 and the small gear 30d attached to the main shaft of the valve drive motor 30c mesh with each other, and the drive shaft 30a and the driven shaft 10a are driven by the driving of the vehicle valve drive motor 30c. Is rotated. In addition, the main-body part which incorporated the drive mechanism of the valve drive part 20 is supported by the support pillar 20a and the support plate 20b which are arrange | positioned at the both sides of the driven shaft 10a.

  On the other hand, some gas shut-off valves are equipped with a backup power supply to open and close the valve in an emergency operation. However, since such a configuration increases the cost, it is required that the valve can be opened and closed manually. The When manually opening and closing the valve connected to the valve drive unit, it is necessary to disconnect the driven shaft of the valve from the valve drive motor. As a mechanism for disconnecting the valve drive motor, a manual clutch is generally used. Yes. When the valve is manually opened and closed, the valve is opened and closed by rotating the driven shaft of the valve with a spanner or the like while the valve is disconnected from the valve driving motor.

  It should be noted that there is no prior art document information to be disclosed because there is no document known invention related to the present invention that the applicant knows at the time of filing the patent.

  In the conventional gas shut-off valve, the drive shaft 30a of the valve drive unit 20 needs to be arranged coaxially with respect to the driven shaft 10a of the valve protruding from the valve body unit 10, so that the valve body unit 10 and A driven shaft 10a and a drive shaft 30a are arranged between the valve drive unit 20 and a support column 20a and a support plate 20b for fixing the valve drive unit 20 to the valve body unit 10 are arranged around the driven shaft 10a and the drive shaft 30a. It is the structure to arrange in. For this reason, as shown in FIG. 4 (B), since the spanner S abuts on the support column 20a and the support plate 20b, there is a problem that the spanable range of the spanner S is narrow and workability is poor.

  This invention makes it a subject to improve workability | operativity at the time of performing the opening / closing operation of a valve manually in a gas cutoff valve.

A gas shut-off valve according to claim 1 is connected to a gas pipe and includes a valve body portion having a built-in shut-off valve for supplying and shutting off gas, and a valve drive portion having a drive mechanism for driving the shut-off valve of the valve body portion A follower shaft of the shutoff valve built in the valve body portion is exposed to the outside of the valve body portion, and the follower shaft is a jig hooking portion on the exposed portion. The valve drive portion is provided with a drive shaft of the drive mechanism for driving the driven shaft coaxially with the driven shaft, and the drive shaft and the driven shaft can be rotated independently of each other. Connected by a connecting means for switching between a non-connected state and an independently non-rotatable connected state, the valve drive portion includes a case portion, and the case portion incorporates a valve drive motor of the drive mechanism. From the box-shaped first case portion having a large moment of inertia and the valve driving motor Serial consists of a second casing part having a built-in torque transmitting mechanism for transmitting the rotational force to the drive shaft, the second case portion is extended from the first case portion to a position including the driven shaft, the valve drive unit , characterized in that by positioning the first casing portion of the casing portion at one position around the axis circumference of the driven shaft and be fixed to the valve body portion by the first case portion.

A gas cutoff valve according to a second aspect is the gas cutoff valve according to the first aspect , wherein the rotational force transmission mechanism is fixed to a small gear fixed to a main shaft of the valve driving motor and to the driving shaft. And a large gear meshed with the small gear.

The gas shut-off valve according to claim 3 is the gas shut-off valve according to claim 1 or 2 , wherein one of the drive shaft and the driven shaft is inserted into a shaft hole formed in the other, and the connecting means Is constituted by an engagement hole formed in a direction intersecting with the drive shaft and the driven shaft, respectively, and a connecting pin penetrating the engagement hole.

  According to the gas shut-off valve of the first aspect, the drive shaft and the driven shaft are disconnected from each other by the connecting means, the driven shaft is rotated by hanging a shaft such as a spanner on the jig hooking portion of the driven shaft, The shut-off valve can be manually opened and closed, and there is only a case portion around the driven shaft, so that the rotation range of a spanner or the like that rotates the driven shaft is wide. Therefore, the workability when manually opening and closing the valve is improved.

In addition, since the valve driving motor of the driving mechanism is provided side by side with the driving shaft and the driven shaft within the range of the length of the driving shaft and the driven shaft, the size can be reduced.

According to the gas shut-off valve of the second aspect , in addition to the effect of the first aspect , since the rotational force transmission mechanism is constituted by a small gear and a large gear, when the shut-off valve is rotated by the valve drive unit, The driving force of the driving motor can be reliably transmitted to the shutoff valve.

According to the gas shut-off valve of the third aspect , in addition to the effect of the first or second aspect , the connecting means is constituted by the engaging hole and the connecting pin of the drive shaft and the driven shaft, so that the structure is simple. In addition, the operability is further improved.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken front view of a gas shut-off valve according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. The gas cutoff valve according to this embodiment includes a valve body 1 and a valve drive unit 2.

  The valve body 1 has a tubular valve housing 3. The valve housing 3 is formed with a first port 31 and a second port 32 which are formed by a taper screw to which a gas pipe (not shown) is screwed, and between the first port 31 and the second port 32. A valve chamber 33 and a pipe line 34 are formed. Valve seats 35, 35 are arranged on the first port 31 side and the pipe line 34 side of the valve chamber 33, and in this valve chamber 33, a ball valve 4 as a “shut-off valve” is provided in the valve seat 35, 35 is arranged so as to be in close contact with 35. A driven shaft 41 of the ball valve 4 is supported by a bearing (not shown) provided in the valve housing, and an end portion of the driven shaft 41 is exposed to the outside of the valve housing 3. The valve housing 3 is formed with a mounting seat 3A for mounting the valve driving unit 2.

  The valve drive section 2 has a lower case section 2A in which a valve drive motor 5 is built, and an upper case section 2B in which a torque transmission mechanism 6 and a control circuit (not shown) are built. The outer case portion of the lower case portion 2A and the upper case portion 2B constitutes an integrally formed “case portion”, but the lower case portion 2A and the upper case portion 2B may be formed of separate members. Note that “lower” in the “lower case part” and “upper” in the “upper case part” are merely terms for distinguishing both members, and are equivalent to “first case part” and “second case part”. It is. The exterior part of the lower case part 2A has a pseudo-cylindrical box shape, and flanges 21 (see FIG. 2) are formed at the four corners on the bottom. The valve drive unit 2 is attached to the valve body 1 by attaching the flange 21 to the mounting seat 3A of the valve housing 3 and screwing the surrounding four places with bolts 9. That is, the valve drive unit 2 is attached to the valve body unit 1 only at the lower case portion 2 </ b> A at one location around the axis of the driven shaft 41. That is, as shown in FIG. 2, the lower case portion 2 </ b> A has a box shape having a large second moment of section, and sufficient strength can be obtained only by the lower case portion 2.

  The valve driving motor 5 has a main shaft 51 protruding into the upper case portion 2B in the lower case portion 2A. The rotational force transmission mechanism 6 in the upper case portion 2A is composed of a small gear 61 and a large gear 62 that mesh with each other. The small gear 61 is attached to the main shaft 51 of the valve drive motor 5, and the large gear 62 is It is attached to a drive shaft 7 supported by a bearing 22. The drive shaft 7 is exposed to the valve body 1 side from the upper case portion 2B, and the drive shaft 7 is connected to the driven shaft 41 of the ball valve 4 by a connecting pin 8.

  When the valve drive unit 2 is repaired or exchanged, the valve drive unit 2 is removed. At this time, the connecting pin 8 is pulled out to release the connection between the drive shaft 7 on the valve drive unit 2 side and the driven shaft 41 on the valve housing 3 side, and the bolt 9 is loosened to remove the drive unit 2 from the mounting seat 3A. The connecting pin 8 is also pulled out when the shutoff valve 4 is manually opened and closed as will be described later.

  FIG. 3 is a partially cutaway view showing details of the driven shaft 41 and the drive shaft 7, and FIG. 3 shows a state where the valve drive unit 2 is removed from the valve body 1. The driven shaft 41 is formed with a spanner hooking portion 41a for manually opening and closing the shut-off valve 4 with a spanner. A shaft hole 41b for inserting the drive shaft 7 is formed at the upper end of the driven shaft 41, and an engagement hole 41c is formed so as to be orthogonal to the shaft hole 41b. An engagement hole 7a is formed in the drive shaft 7 so as to be orthogonal to the shaft. The engagement holes 41 c and 7 a have a shape that matches the outer diameter of the connecting pin 8.

  When the connecting pin 8 is inserted into the engagement holes 41 c and 7 a with the drive shaft 7 inserted into the shaft hole 41 b of the driven shaft 41, the driven shaft 41 is connected and fixed to the drive shaft 7. The shut-off valve 4 can be opened and closed by the valve drive motor 5. On the other hand, when the connecting pin 8 is pulled out, the driven shaft 41 can rotate freely with respect to the drive shaft 7 and, as shown in FIG. 2, the spanner S is applied to the spanner hanging portion 41a to rotate the driven shaft 41. Thus, it is possible to manually open and close the shut-off valve 4. At this time, since the valve drive unit 2 is fixed to the valve body 1 only by the lower case portion 2A, only the lower case portion 2A is provided around the driven shaft 41 on one side thereof. Accordingly, when the driven shaft 41 is rotated, the handle of the spanner S comes into contact only with the lower case portion 2A, so that the rotation range of the spanner S becomes wide. Therefore, the workability when manually opening and closing the valve is improved.

  In the embodiment, the valve driving motor 5 is accommodated in the lower case portion 2A. Therefore, as shown in FIG. 1, the valve driving motor 5 has the length of the drive shaft 7 and the driven shaft 41. It will be arranged in the inside, and compactization is achieved.

  In the embodiment, since the connecting means for connecting the drive shaft and the driven shaft is constituted by the connecting pin and the engaging hole, the structure is simple and the operation is also simple. For example, when a manual clutch is used as a mechanism for disconnecting the valve drive motor as in a conventional gas shut-off valve, a complicated mechanism is required to disconnect the valve drive motor, and a handle or the like for manual operation is provided. It is necessary, the workability of manual opening and closing is poor, and the cost is high. This embodiment does not have such a problem. However, in order to improve the operability by widening the rotation range of a spanner, etc., this connecting means can be configured as long as it can switch between the connected state and the non-connected state of the drive shaft and the driven shaft. But you can.

  In this embodiment, a cylindrical cover 42 (see FIG. 3) that is slidable in the axial direction is attached around the driven shaft 41. That is, unless the connecting pin 8 is pulled out and slid upward, the cover 42 does not expose the spanner hooking portion 41a, so that it cannot be inadvertently manually operated. The cover 42 also serves to prevent dust and the like from entering the bearing and seal portion on the valve housing side.

It is a partially broken front view of the gas cutoff valve of one embodiment of the present invention. It is AA sectional drawing in FIG. 1 of the gas cutoff valve of embodiment. It is a partially broken view which shows the detail of the driven shaft and drive shaft in embodiment. It is a figure which shows an example of the conventional gas cutoff valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body part 2 Valve drive part 2A Lower case part 2B Upper case part 3 Valve housing 4 Ball valve (shutoff valve)
5 Motor for driving a valve 7 Drive shaft 8 Connecting pin 41 Driven shaft

Claims (3)

A gas shut-off valve comprising a valve body portion having a built-in shut-off valve connected to a gas pipe for supplying and shutting off gas, and a valve drive portion having a built-in drive mechanism for driving the shut-off valve of the valve body portion. Te,
The driven shaft of the shut-off valve built in the valve body is exposed to the outside of the valve body,
The driven shaft has a jig hook on the exposed portion,
The valve drive unit is provided with a drive shaft of the drive mechanism for driving the driven shaft coaxially with the driven shaft, and the drive shaft and the driven shaft can be rotated independently of each other. And connected by a connecting means for switching between a connection state that cannot be rotated independently,
The valve drive section includes a case section;
The case portion includes a box-shaped first case portion having a large second moment in section that incorporates a valve drive motor of the drive mechanism, and a rotational force transmission that transmits a rotational force from the valve drive motor to the drive shaft. A second case part having a built-in mechanism, the second case part extending from the first case part to a position including the driven shaft,
And characterized in that the valve drive unit and to place said first casing portion of the casing portion at one position around the axis circumference of the driven shaft so as to secure the valve body portion by the first case portion Gas shut-off valve. The rotational force transmission mechanism includes a small gear fixed to the main shaft of the valve driving motor, and a large gear fixed to the driving shaft and meshed with the small gear. The gas cutoff valve according to claim 1 . One of the drive shaft and the driven shaft is inserted into a shaft hole formed in the other,
The connection means includes an engagement hole formed in a direction intersecting with the drive shaft and the driven shaft, respectively, and a connection pin penetrating the engagement hole. The gas cutoff valve according to 1 or 2 .

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