Gas meter reset device

Abstract

To provide a gas meter restoring device capable of reliably performing restoring operation of a restoring shaft even if an interval between a shutoff valve case and a side plate of a gas meter body is narrow.SOLUTION: A nut mount part 21a is disposed in an upper part of a mount hole 9, an opening edge of the mount hole 9 is fastened between a mount nut 22 and a restoring shaft box flange part 21b by screwing the mount nut 22 to the nut mount part 21a, and a restoring spring presser 23 is inserted into a restoring shaft 20 inserted into a restoring shaft box 21, the restoring spring presser 23 is inserted axially movably in a state in which the same is fixed around the inside of the restoring shaft box 21, a restoring spring 24 is interposed between the restoring spring presser 23 and the restoring shaft box 21 in a state in which the restoring shaft 20 is inserted, a gas meter restoring device has a cylindrical cam member 25 that axially moves in linking with valve opening operation of a shutoff valve 5, a ring groove 26 is formed on an inner peripheral surface of the nut mount part 21a, an opening edge 25a of the cylindrical cam member 25 is positioned in a ring groove 26 at the time of valve opening operation of the shutoff valve 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a gas meter return device.

Background Art

[0002] Patent Document 1 discloses a generally used gas meter return device. FIG. 4 is a cross-sectional view of a main part of a gas meter showing a conventional gas meter return device, and FIG. 4(b) is an enlarged cross-sectional view of the main part of FIG. 4(a). The gas meter 101 has a gas inlet 102 and a gas outlet 103, and a shut-off valve 105 is provided in the gas flow path 104 from the gas inlet 102 to the gas outlet 103. The gas meter return device 106 includes an intermediate shaft 110 that moves together with the shut-off valve 105, a return shaft 120 that moves the intermediate shaft 110 in the valve closed state to the valve open state, and an operation display unit 130 that displays the open / closed state of the valve. The intermediate shaft 110 is attached to the shut-off valve case 107 by an intermediate bearing 111. The return shaft 120 is disposed within a return shaft box 121, and the return shaft box 121 is attached to the side plate 108 of the gas meter body. And, by providing a cam mechanism in the return shaft box 121, the display on the operation display unit 130 is switched as the return shaft 120 moves. In the shut-off valve case 107 within the gas meter body, the intermediate shaft 110 is supported by the intermediate bearing 111 so as to be axially movable, and the intermediate shaft 110 is disposed on the same axis as the valve shaft 105a of the shut-off valve 105. The inner end of the intermediate shaft 110 faces the valve shaft 105a. On the side plate 108 of the gas meter body facing the valve plate of the shut-off valve 105, a mounting hole 109 is formed on the same axis as the valve shaft 105a of the shut-off valve 105 and the intermediate shaft 110. A cylindrical return shaft box 121 is inserted into the mounting hole 109, and a nut mounting portion 121a and a return shaft box flange portion 121b are formed at the outer end of the return shaft box 121. The return shaft box flange portion 121b is disposed outside the mounting hole 109, and the nut mounting portion 121a is disposed inside the mounting hole 109. By screwing the mounting nut 122 onto the nut mounting portion 121a, the opening of the mounting hole 109 is tightened between the mounting nut 122 and the return shaft box flange portion 121b. A return shaft 120 is axially movable inside the return shaft box 121 for pushing the valve stem 105a of the shut-off valve 105 when it is closed, and a return spring retainer 123 is inserted into the return shaft 120. The return spring retainer 123 is inserted into the return shaft box 121 so as to be movable on the shaft while being prevented from rotating. A return spring 124 is interposed between the return spring retainer 123 and the return shaft box 121, with the return shaft 120 inserted between them. The cylindrical cam member 125 is rotatably and axially movable in the return shaft box 121 and moves axially in conjunction with the closing operation of the shut-off valve 105. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Publication number 6-3248 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, in the gas meter reset device 106 described in Patent Document 1, if the gap between the shut-off valve case 107 and the side plate 108 of the gas meter body becomes narrow, and the axial travel distance of the reset shaft 120 becomes shorter, the reset operation of the reset shaft 120 cannot be performed.

[0005] Therefore, the present invention aims to provide a gas meter reset device that can reliably reset the reset shaft even when the gap between the shut-off valve case and the side plate of the gas meter body is narrow. [Means for solving the problem]

[0006] The gas meter reset device 6 of the present invention as described in claim 1 has an intermediate shaft 10 supported in the shut-off valve case 7 inside the gas meter body via an intermediate bearing 11 so as to be axially movable, the intermediate shaft 10 is arranged on the same axis as the valve stem 5a of the shut-off valve 5, the inner end of the intermediate shaft 10 faces the valve stem 5a, and a mounting hole 9 is formed in the side plate 8 of the gas meter body facing the valve plate of the shut-off valve 5, which is located on the same axis as the valve stem 5a of the shut-off valve 5 and the intermediate shaft 10, a cylindrical reset shaft box 21 is inserted through the mounting hole 9, a nut mounting portion 21a and a reset shaft box flange portion 21b are formed at the outer end of the reset shaft box 21, the reset shaft box flange portion 21b is positioned outside the mounting hole 9 and the nut mounting portion 21a is positioned inside the mounting hole 9, and a mounting nut 22 is screwed onto the nut mounting portion 21a, thereby the mounting nut 22 and the reset shaft box The opening of the mounting hole 9 is fastened between the lunge portion 21b and the gas meter reset device 6, wherein a reset shaft 20 for pushing the valve shaft 5a of the shut-off valve 5 in the closed state is inserted axially into the reset shaft box 21, a reset spring retainer 23 is inserted onto the reset shaft 20, the reset spring retainer 23 is inserted axially into the reset shaft box 21 in a state where it is not rotated, a reset spring 24 is interposed between the reset spring retainer 23 and the reset shaft box 21 with the reset shaft 20 inserted, and a cylindrical cam member 25 is provided in the reset shaft box 21 so as to be rotatable and axially movable and moves axially in conjunction with the closing operation of the shut-off valve 5, wherein a ring groove 26 is formed on the inner circumferential surface of the nut mounting portion 21a, and when the shut-off valve 5 is closing, the open end 25a of the cylindrical cam member 25 is positioned in the ring groove 26. The present invention as described in claim 2 is characterized in that, in the gas meter reset device 6 as described in claim 1, the intermediate bearing 11 is arranged on the shut-off valve 5 side of the shut-off valve case 7, a length adjustment part 12 is provided at the shut-off valve side end of the intermediate shaft 10 to adjust the length dimension W between the shut-off valve 5 and the intermediate shaft 10, and the intermediate shaft 10 is provided with an intermediate shaft adjustment upper limit indicator 10a that indicates the upper limit of the adjustment range of the intermediate shaft 10. [Effects of the Invention]

[0007] According to the gas meter reset device of the present invention, even if the gap between the shut-off valve case and the side plate of the gas meter body is narrow, a ring groove is formed on the inner circumferential surface of the nut mounting portion, and the open end of the cylindrical cam member is positioned in this ring groove, thereby widening the range of movement of the cylindrical cam member and ensuring reliable reset operation of the reset shaft. [Brief explanation of the drawing]

[0008] [Figure 1] External perspective view of a gas meter equipped with a gas meter resetting device according to one embodiment of the present invention. [Figure 2] Cross-sectional view of the main part of the gas meter. [Figure 3] Diagram showing the intermediate axis of the gas meter reset device according to this embodiment. [Figure 4] Cross-sectional view of the main part of a gas meter showing a conventional gas meter resetting device. [Modes for carrying out the invention]

[0009] In the first embodiment of the present invention, a ring groove is formed on the inner circumferential surface of the nut mounting portion, and when the shut-off valve is closed, the open end of the cylindrical cam member is positioned in the ring groove. According to this embodiment, a ring groove is formed on the inner circumferential surface of the nut mounting portion, and the open end of the cylindrical cam member is positioned in this ring groove, thereby increasing the range of movement of the cylindrical cam member and ensuring reliable return of the return shaft.

[0010] A second embodiment of the present invention is a gas meter resetting device according to the first embodiment, wherein the intermediate bearing is arranged on the shut-off valve side of the shut-off valve case, a length adjustment section is provided at the shut-off valve side end of the intermediate shaft to adjust the length between the shut-off valve and the intermediate shaft, and the intermediate shaft is provided with an intermediate shaft adjustment limit indicator that shows the upper limit of the adjustment range of the intermediate shaft. According to this embodiment, by providing the length adjustment part at the shut-off valve side end of the intermediate shaft, it becomes difficult to determine the upper limit of the adjustment width. This can be solved by providing the intermediate shaft adjustment upper limit display on the intermediate shaft. Therefore, the intermediate bearing and the length adjustment part can be arranged on the shut-off valve side of the shut-off valve case. Even when the distance from the shut-off valve case to the mounting surface of the gas meter return device is short, the gas meter return device can be mounted.

Example

[0011] Hereinafter, a gas meter return device according to an embodiment of the present invention will be described. FIG. 1 is an external perspective view of a gas meter provided with the gas meter return device according to this embodiment, FIG. 2 is a cross-sectional view of a main part of the same gas meter, FIG. 2(a) shows the state at the time of shut-off by the shut-off valve (valve closed state), and FIG. 2(b) shows the state at the time of return operation of the shut-off valve (valve open state by full push).

[0012] As shown in FIG. 1, the gas meter 1 has a gas inlet 2 and a gas outlet 3. The gas meter 1 is provided with a gas meter return device 6 that returns the shut-off valve 5 (see FIG. 2) from the valve closed state to the valve open state. As shown in FIG. 2, a shut-off valve 5 is provided in the gas flow path 4 from the gas inlet 2 to the gas outlet 3. The shut-off valve 5 shuts off the gas flow path 4 formed in the gas meter 1 main body. The gas meter return device 6 includes an intermediate shaft 10 that moves together with the shut-off valve 5, a return shaft 20 that moves the intermediate shaft 10 in the valve closed state to the valve open state, and an operation display part 30 that displays the valve open state and the valve closed state. The intermediate shaft 10 is attached to the shut-off valve case 7 by an intermediate bearing 11. One end (shut-off valve side end) of the intermediate shaft 10 abuts on the shut-off valve 5 via a length adjustment part 12, and a cylindrical cam member 25 abuts on the other end of the intermediate shaft 10. Therefore, the intermediate shaft 10 and the cylindrical cam member 25 move together with the shut-off valve 5.

[0013] In the shut-off valve case 7 inside the gas meter body, an intermediate shaft 10 is supported axially movably via an intermediate bearing 11. The intermediate shaft 10 is arranged on the same axis as the valve shaft 5a of the shut-off valve 5. The inner end of the intermediate shaft 10 faces the valve shaft 5a. On the side plate 8 of the gas meter body opposing the valve plate of the shut-off valve 5, a mounting hole 9 is formed on the same axis as the valve shaft 5a of the shut-off valve 5 and the intermediate shaft 10. A cylindrical return shaft box 21 is inserted through the mounting hole 9. At the outer end of the return shaft box 21, a nut mounting portion 21a and a return shaft box flange portion 21b are formed. The return shaft box flange portion 21b is arranged outside the mounting hole 9, and the nut mounting portion 21a is arranged inside the mounting hole 9. By screwing a mounting nut 22 onto the nut mounting portion 21a, the edge portion of the mounting hole 9 is fastened between the mounting nut 22 and the return shaft box flange portion 21b.

[0014] Inside the return shaft box 21, a return shaft 20 for pushing the valve shaft 5a of the shut-off valve 5 in the closed valve state is inserted axially movably, and a return spring retainer 23 is inserted onto the return shaft 20. The return spring retainer 23 is inserted axially movably into the return shaft box 21 in a non-rotating state. A return spring 24 is interposed between the return spring retainer 23 and the return shaft box 21 with the return shaft 20 inserted. A cylindrical cam member 25 is provided rotatably and axially movably on the return shaft box 21, and moves axially in conjunction with the closing operation of the shut-off valve 5. A ring groove 26 is formed on the inner peripheral surface of the nut mounting portion 21a. When the shut-off valve 5 closes, the open end 25a of the cylindrical cam member 25 is positioned in the ring groove 26. Thus, according to this embodiment, by forming the ring groove 26 on the inner peripheral surface of the nut mounting portion 21a and positioning the open end 25a of the cylindrical cam member 25 in this ring groove 26, the movement range of the cylindrical cam member 25 can be expanded, and the return operation of the return shaft 20 can be surely performed.

[0015] As shown in Figure 2(a), when the shut-off valve 5 is shut off (valve closed), the cylindrical cam member 25 is in the position of the shut-off valve 5 in the closed state (moved to the right), and the open end 25a of the cylindrical cam member 25 is located in the ring groove 26. As shown in Figure 2(b), when the shut-off valve 5 is returned to its original position (valve open), the return shaft 20 is moved towards the shut-off valve 5 by pressing the operation indicator unit 30. Moving the return shaft 20 towards the shut-off valve 5 brings the cylindrical cam member 25, the intermediate shaft 10, and the shut-off valve 5 to the valve open position (the position moved to the left in Figure 2). In this way, by moving the return shaft 20 towards the shut-off valve 5, the shut-off valve 5 becomes open, and at the moment the shut-off valve 5 becomes open, the operation display unit 30 switches to a display indicating the valve is open. By pushing in the return shaft 20, the return spring 24 is compressed, and by releasing the pressure on the return shaft 20, the force of the return spring 24 moves the return shaft 20 and the operation indicator unit 30 to the state shown in Figure 2(a).

[0016] Figure 3 shows the intermediate shaft of the gas meter reset device according to this embodiment. Figure 3(a) is a perspective view showing the device attached to the shut-off valve case, Figure 3(b) is a side view showing the components used to attach the intermediate shaft to the shut-off valve case, and Figure 3(c) is a partial cross-sectional side view showing the attachment to the shut-off valve.

[0017] As shown in Figure 3(a), the intermediate shaft 10 is attached to the shut-off valve case 7 by an intermediate bearing 11 and is in contact with the shut-off valve 5 via a length adjustment section 12. The intermediate bearing 11 and the length adjustment section 12 are located on the shut-off valve 5 side of the shut-off valve case 7. By arranging the intermediate bearing 11 and the length adjustment section 12 on the shut-off valve 5 side of the shut-off valve case 7 in this way, the gas meter reset device 6 can be installed even when the distance from the shut-off valve case 7 to the mounting surface of the gas meter reset device 6 (the side plate 8 of the gas meter body shown in Figure 2) is short. As shown in Figure 3(b), the intermediate shaft 10 is provided with an intermediate shaft adjustment limit indicator 10a that indicates the upper limit of the adjustment range of the intermediate shaft 10. The intermediate bearing 11 has a bearing portion 11a in its center that allows the intermediate shaft 10 to slide. The length adjustment portion 12 is provided with a hole 12a for a set screw. As shown in Figure 3(c), the length adjustment section 12 is a component that adjusts the length dimension W between the shut-off valve 5 and the intermediate shaft 10. The length dimension W is minimized at the first position X, where the end of the intermediate shaft 10 is inserted furthest into the length adjustment section 12, and maximized at the second position Y, where the end of the intermediate shaft 10 is extended furthest from the length adjustment section 12. If the end of the intermediate shaft 10 is extended beyond the second position Y, the intermediate shaft 10 can no longer be fixed to the length adjustment section 12. For this reason, when the end of the intermediate shaft 10 reaches the second position Y, the intermediate shaft adjustment upper limit indicator 10a appears from the intermediate bearing 11 or the shut-off valve case 7, making it easier to determine the upper limit of the adjustment range.

[0018] As described above, by positioning the length adjustment section 12 on the shut-off valve 5 side of the shut-off valve case 7, it becomes difficult to directly visually check the adjustment between the end of the intermediate shaft 10 and the length adjustment section 12. However, by providing the intermediate shaft adjustment upper limit indicator 10a on the intermediate shaft 10, the upper limit of the adjustment range can be determined. [Industrial applicability]

[0019] According to the present invention, the return shaft can be reliably returned to its original position even if the gap between the shut-off valve case and the side plate of the gas meter body is narrow. [Explanation of Symbols]

[0020] 1. Gas meter 2 Gas inlet 3. Gas outlet 4 Gas flow path 5. Shut-off valve 5a Valve stem 6. Gas meter reset device 7. Shut-off valve case 8. Side panel of the gas meter body 9 mounting holes 10 Intermediate axis 10a Intermediate axis adjustment upper limit display 11 Intermediate bearing 11a Bearing part 12 Length adjustment section 12a Hole for retaining screw 20 Recovery axis 21 Return shaft box 21a Nut mounting section 21b Return shaft box flange section 22 Mounting nuts 23. Return spring retainer 24. Return spring 25 Cylindrical cam member 25a Open end 26 Ring grooves 30 Operation display section W Length Dimension X 1st position Y 2nd position

Claims

1. An intermediate shaft is supported in the shut-off valve case inside the gas meter body via an intermediate bearing so as to be axially movable, and the intermediate shaft is arranged on the same axis as the valve stem of the shut-off valve. The inner end of the intermediate shaft faces the valve shaft, Mounting holes are formed in the side plate of the gas meter body that faces the valve plate of the shut-off valve, and the valve shaft and intermediate shaft of the shut-off valve are located on the same axis as the valve shaft and intermediate shaft of the shut-off valve. A cylindrical return shaft box is inserted through the aforementioned mounting hole. The outer end of the return shaft box is formed with a nut mounting portion and a return shaft box flange portion. The return shaft box flange portion is positioned outside the mounting hole, the nut mounting portion is positioned inside the mounting hole, and the mounting nut is screwed onto the nut mounting portion, thereby fastening the opening of the mounting hole between the mounting nut and the return shaft box flange portion. A return shaft for pushing the valve shaft of the shut-off valve in the closed state is inserted into the return shaft box so as to be axially movable. A return spring retainer is inserted into the return shaft. The return spring retainer is inserted into the return shaft box so as to be axially movable while being prevented from rotating. A return spring is interposed between the return spring retainer and the return shaft box with the return shaft inserted. A gas meter reset device comprising a cylindrical cam member that is rotatably and axially movable in the reset shaft box and moves axially in conjunction with the closing operation of the shut-off valve, A ring groove is formed on the inner circumferential surface of the nut mounting portion. When the shut-off valve is closed, the open end of the cylindrical cam member is positioned in the ring groove. A gas meter resetting device characterized by the following features.

2. The intermediate bearing is positioned on the shut-off valve side of the shut-off valve case. The end of the intermediate shaft on the shut-off valve side is provided with a length adjustment section for adjusting the length between the shut-off valve and the intermediate shaft. The aforementioned intermediate shaft is provided with an intermediate shaft adjustment limit indicator that shows the upper limit of the adjustment range of the intermediate shaft. The gas meter resetting device according to feature 1.

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