JP2010169136A - Gas cut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cut-off valve wherein the cutoff valve of a valve element part can be rotated by a valve driving part even when the driving shaft of the valve driving part fails to be connected to a driven shaft of the valve element part. <P>SOLUTION: A meshing part 41 is formed at the end of the driving shaft 4 of a ball valve 36. The meshing part 41 of the driven shaft 4 is a protruded part which is protruded to the side of the driving shaft 7. A meshing part 71 is formed at the end of the driving shaft 7 of the valve driving part 2. The meshing part 71 of the driving shaft 7 is an angular groove directed perpendicular to an axis L. The driving shaft 7 is rotated by the valve driving part 2 to fit the meshing part 71 of the driving shaft 7 to the meshing part 41 of the driven shaft 4. The driven shaft is connected to the driving shaft 7 to open/close the ball valve 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

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, the gas shut-off valve needs to be replaced or maintained at regular intervals in order to maintain its function. At the time of this replacement and inspection work, for example, after removing the gas shut-off valve together with the housing from the gas pipe, the housing of the gas shut-off valve to be replaced is connected to the gas pipe. However, due to the work of removing and reattaching the flange connection of the housing, the work of replacing the gas shut-off valve is poor, and there is a problem that the gas supply must be stopped for a long time. In particular, when a pressure sensor that detects an abnormality such as a gas leak is attached to the housing, the entire housing must be removed to replace the pressure sensor.

  Therefore, for example, in Japanese Unexamined Patent Application Publication No. 2007-270957 (Patent Document 1), a pressure sensor is built in the valve drive unit, and the valve drive unit can be removed while the housing is attached to the gas pipe. A gas shut-off valve that simplifies work is disclosed.

  Here, in the gas shut-off valve of Patent Document 1, when the valve drive unit is removed, the valve body is also removed from the gas pipe. Therefore, when removing the valve drive unit, it is necessary to shut off the gas in the gas pipe from the beginning. There is. On the other hand, a valve body portion having a built-in shut-off valve connected to the gas pipe for supplying and shutting off the gas and a valve drive portion having a built-in drive mechanism for driving the shut-off valve of the valve body portion are provided. There is something. In this gas shut-off valve, 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. And a drive part can be removed with the valve body part connected to gas piping.

JP 2007-270957 A

  In a gas shut-off valve that can separate the valve drive part and the valve body part, the drive force of the valve drive part is obtained by connecting the drive shaft of the valve drive part and the driven shaft of the valve body part, for example, by a connecting pin or the like. It is conceivable to transmit to the shut-off valve, but when the valve drive unit is installed, if the drive shaft and the driven shaft are forgotten to be connected by a connecting pin or the like, or if the connection is incomplete, the motor of the valve drive unit Even if it rotates, the rotation is not transmitted to the valve body, and the function of the gas shut-off valve is lost.

  An object of the present invention is to enable a valve drive unit to rotate a shut-off valve of a valve body part by a valve drive part even if the connection between the drive shaft of the valve drive part and the driven shaft of the valve body part is forgotten in a gas shut-off valve. To do.

  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. The driven valve of the shut-off valve built in the valve body part is exposed to the outside of the valve body part, and the valve driving unit drives the driven shaft. The drive shaft of the mechanism is provided coaxially with the driven shaft, and is fitted and detached in the axial direction at the relative rotational positions of the drive shaft and the driven shaft at the ends of the drive shaft and the driven shaft. And a biasing means for biasing the driven shaft and / or the drive shaft in a direction in which the meshing portion is fitted.

  According to the gas shut-off valve of the first aspect, when the valve drive unit is attached, even if the drive shaft of the valve drive unit and the driven shaft of the valve body unit are forgotten to be connected, the drive shaft is rotated by the valve drive unit. Then, when the drive shaft and the driven shaft are relatively in a predetermined rotational position, the meshing portion is fitted by the biasing means, and the drive shaft and the driven shaft are connected. The shut-off valve can be rotated.

It is a partially broken front view of the gas cutoff valve of one embodiment of the present invention. It is a partially enlarged view of the driven shaft and the drive shaft of the embodiment. It is a figure which shows the non-connection state and connection state of the driven shaft and drive shaft of embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view of a gas shut-off valve according to an embodiment of the present invention. The gas shut-off 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 36 as a “shut-off valve” is provided in the valve seat 35, 35 is arranged so as to be in close contact with 35. The driven shaft 4 of the ball valve 36 is supported by a bearing (not shown) provided in the valve housing, and the end of the driven shaft 4 is exposed to the outside of the valve housing 3. A meshing portion 41 is formed at the end of the driven shaft 4 on the valve drive portion 2 side. The valve housing 3 is formed with a mounting seat 3A for mounting the valve driving unit 2.

  The valve drive unit 2 includes a lower case portion 2A in which a valve drive motor 5 is incorporated, and an upper case portion 2B in which a torque transmission mechanism 6 and a control circuit such as a microcomputer (not shown) are incorporated. 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 the drive shaft 7 supported by the bearing 21. And this drive shaft 7 is exposed to the valve body 1 side from the upper case part 2B. An engagement portion 71 is formed at the end of the drive shaft 7 on the valve body 1 side, and the engagement portion 71 of the drive shaft 7 is fitted to the engagement portion 41 of the driven shaft 4. And the driven shaft 4 are connected.

  With the above configuration, the valve drive motor 5 is driven to rotate forward and reverse, and this rotational force is transmitted to the large gear 62 via the small gear 61 to rotate the large gear 62. As a result, the ball valve 36 is switched between a fully open state and a fully closed state.

  As shown in FIG. 2, the driven shaft 4 includes a rectangular columnar rod 42 connected to the ball valve 36 side and a cap 43 having a rectangular columnar sliding hole 431 fitted to the rod 42. . The cap 43 is fitted to the rod 42 with a coil spring 44 as an urging means disposed in the sliding hole 431. As a result, the cap 43 is biased toward the drive shaft 7. The engaging portion 41 at the end of the cap 43 on the drive shaft 7 side has convex portions 41a and 41a protruding at two locations on the periphery of the end portion. Further, the engaging portion 71 at the end of the drive shaft 7 has a square groove 71 a formed in a direction orthogonal to the axis L.

  As shown in FIG. 3A, when the driven shaft 4 and the drive shaft 7 are not connected, the convex portions 41a and 41a of the driven shaft 4 are in contact with both sides of the angular groove 71a of the drive shaft 7. It becomes. When the drive shaft 7 is rotated by the valve drive unit 2, the cap 43 is biased toward the drive shaft 7 (in the direction of the axis L) by the coil spring 44, so that the drive shaft 7 rotates a predetermined amount with respect to the driven shaft 4. When the position is reached, the convex portions 41a and 41a of the driven shaft 4 are fitted into the angular groove 71a of the drive shaft 7, and the meshing portion 41 of the driven shaft 4 and the meshing portion 71 of the drive shaft 7 are fitted.

  Therefore, when the valve drive unit 2 is attached, even if the connection between the driven shaft 4 and the drive shaft 7 is forgotten, the drive shaft 7 is automatically connected.

  In the above embodiment, the cap 42 (engagement portion 41) on the driven shaft 4 side is urged toward the drive shaft 7 side by the coil spring 43. However, such a engagement portion is urged in the direction of the axis L. May be configured on the drive shaft 7 side.

  Further, in the embodiment, the angular meshing portion of the driven shaft and the driving meat is configured by the convex portion and the square groove, but the meshing portion can be fitted and detached in the direction of the axis L of the driven shaft and the driving shaft. Thus, it is only necessary that the driven shaft and the drive shaft have a fixed relationship in the direction around the axis L in the fitted state.

DESCRIPTION OF SYMBOLS 1 Valve body part 2 Valve drive part 4 Driven shaft 7 Drive shaft 36 Ball valve (shutoff valve)
41 meshing part 71 meshing part

Claims (1)

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. And
The driven shaft of the shut-off valve built in the valve body is exposed to the outside of the valve body,
The valve drive unit is provided with a drive shaft of the drive mechanism for driving the driven shaft coaxially with the driven shaft,
At the end portions of the drive shaft and the driven shaft, a meshing portion that can be fitted and detached in the axial direction at a predetermined relative rotational position of the drive shaft and the driven shaft is formed, and the meshing portion A gas shut-off valve comprising urging means for urging the driven shaft and / or the drive shaft in a direction in which the shaft is fitted.

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