JP2500643Y2 - Valve open / close mechanism for gas meter with built-in shutoff valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening / closing mechanism for a gas meter with a built-in shutoff valve, and more particularly to improvement of a return mechanism which can be commonly used for left and right piping models of a gas meter upper case.

[0002]

2. Description of the Related Art The applicant of the present invention previously installed a solenoid type shut-off valve on a gas meter to detect the depressurized state of the gas supplied into the case of the gas meter and to detect other conditions such as a gas leak detector and a vibration sensor. A mechanism has been developed that shuts off the gas flow path inside the manufacturer by operating the shut-off valve in conjunction with the output of the device.

The advantage of this structure is that the gas can be shut off at the source of the gas. For this reason, a shut-off valve of this kind is provided with a return mechanism for manual return.

This return mechanism is provided with a return rod which faces the valve body of the shutoff valve with a nozzle interposed therebetween, and the return rod is always provided with a spring means to directly or indirectly through the power transmission mechanism of the valve body. It is displayed by pressing and urging.

Then, when a cutoff signal is input due to an abnormal state, the solenoid is excited, the valve body projects against the biasing force of the spring means, and the nozzle is closed.

Therefore, when the shutoff state is reached, the return rod projects to the front part of the case in an airtight state, and indicates that the shutoff state is set.

Further, when the flow path is released again from this shut-off state, the valve body is pushed back by manually pressing the return rod to release the flow path.

However, according to this structure, since the return rod constantly presses the valve body, if the output of the solenoid is small, the valve body may not protrude even in the excited state.

That is, this type of gas meter has a battery for operating for a long time as a power source, and the solenoid that consumes the maximum amount of power is as small as possible and power is saved. The various functional parts specified must be designed to withstand long-term use. For that purpose, it is necessary to minimize the mechanical loss due to the contact of the return rod at all times.

However, since the maximum torque is required in the initial state of operation of the solenoid, the resistance at this time has been a major obstacle to downsizing of the solenoid and power saving.

In order to solve this problem, the present applicant has previously developed a valve opening / closing mechanism for a gas meter with a shut-off valve that is capable of completely removing the operating resistance of the return rod in the initial operating state of the solenoid. This mechanism is actually Kaihei
It is described in Japanese Patent Publication No. JP-A-2003-187, and was constructed as shown in FIGS. FIG. 2 is a front view showing a gas meter with a built-in shutoff valve, which includes a lower case 1 having a built-in membrane type supply / discharge mechanism (not shown) for sucking and discharging gas, and a flange joined to the upper part of the lower case 1 and having the above-mentioned supply. The upper case 4 has a built-in integrating mechanism (not shown) for converting the discharging operation into rotation and displaying the integrated value, and also has a gas inlet 2 and a gas outlet 3.

As shown in FIG. 3, the upper case 4 is provided with a gas passage 5 for communicating the gas inlet 2 with the inside of the lower case 1. The gas passage 5 is provided with a nozzle 6 as a valve seat. Entrance 2
It is arranged orthogonally to. Further, a solenoid type shutoff valve 7 is attached on the upstream side of the nozzle 6, and a valve body 8 of the shutoff valve 7 faces the nozzle 6. Further nozzle 6
A cam 9 is rotatably provided inside via a support shaft 10, and the tip of the cam 9 can press the valve body 8 by the rotation of the cam 9.

On the other hand, a shaft hole 11 is formed obliquely from the lower part in the upper case 4, and a valve return rod 12 is layered in the shaft hole 11 so as to be airtight and capable of advancing and retracting. And valve return rod 12
Has its end abutted on the cam 9, and the opposite operation end projects outside the upper case 4. A return knob 13 is fixed to the protruding end of the valve return rod 12, and the return knob 1
3 is held by a return cover 14 fixed to the upper case 24 so as to be movable back and forth in the axial direction. Further return cover 1
A transparent cap 15 for covering the return knob 13 is detachably attached to the reference numeral 4, and the transparent cap 15 is connected to the return cover 14 via a chain 16. A compression coil spring 17 for biasing the return knob 13 toward the protruding side is inserted in the return cover 14.

According to the above construction, the cam 9 is normally operated.
Is distant from the valve body 8 and an abnormal condition occurs and the shutoff valve 7
There is no resistance when it operates. When the cap 15 is removed and the return knob 13 is pushed after the abnormal situation is released, the valve return rod 12 is moved forward, the cam 9 is projected from the nozzle 6 and the valve body 8 is moved backward to open the nozzle 6. Therefore, even if the output of the shutoff valve 7 is relatively small, a reliable operating state can be obtained.

[0015]

However, according to the conventional valve opening / closing mechanism configured as described above, the valve return rod 1
The position of the shaft hole 11 through which the gas 2 is inserted differs depending on the model of the upper case 4 in which the gas inlet 2 is on the right or left side, and in the case of the right piping model, it must be provided on the right side. For this reason, the upper case 4 must be prepared for exclusive use for right piping or left piping, which causes a problem that the number of parts increases and the shape becomes complicated. In particular, in the case of mechanical recovery, it is obligatory to install a self-damage prevention mechanism that closes the flow of gas when the return rod is pushed continuously, which further complicates the mechanism and raises the cost. Further, since it is expected that a bidirectional valve having an electric return mechanism will be adopted, it is necessary to have a structure capable of removing the mechanical return mechanism. However, the conventional structure can be removed.

The present invention has been made in view of the above points, and can be commonly used for the upper cases of both left and right models, the self-damage prevention mechanism can be easily attached, and the gas meter can be attached and detached. An object is to provide a valve opening / closing mechanism for a gas meter with a built-in shutoff valve that is inexpensive and has a simple structure.

[0017]

In order to achieve the above-mentioned object, the present invention has a lower case having a built-in metering section, an integrating mechanism section, and a gas inlet and a gas outlet.
A valve opening / closing mechanism that is provided in a shutoff valve built-in gas meter consisting of an upper case that has a shutoff valve that opens and closes a gas flow path between the gas inlet and the metering unit, and that opens and closes the shutoff valve from outside the meter, First and second cylinders that coaxially and airtightly connect the gas inlet and the gas supply pipe, and are axially slidably mounted in the first cylinder on the gas inlet side, and at one end thereof, A rod member having a pressing portion for axially pressing the valve body of the shutoff valve, and having at the other end a valve portion for opening and closing a valve seat provided at the end of the second cylinder on the gas inlet side; An eccentric cam that is axially supported by the first cylindrical body and abuts against one end of the rod member on the valve portion side. The eccentric cam is rotated from the outside to press the rod member, The valve body is moved to open the valve, and the valve portion of the second cylinder is closed. It is characterized by a door.

[0018]

According to the above construction, since the valve return mechanism is provided at the connecting portion between the gas inlet of the gas meter and the gas supply pipe, the left and right models of the upper case can be easily accommodated and shared. Therefore, since the upper case itself does not have a valve return mechanism, the shape is simple and automatic assembly is easy. Moreover, when the shutoff valve is a bidirectional valve, the valve return mechanism can be easily removed. Furthermore, the self-damage prevention mechanism can be easily provided by providing the valve seat on the second cylindrical body provided at the connecting portion and providing the valve body on the rod member for opening and closing the valve seat.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, parts corresponding to those of the conventional example shown in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. A first cylinder 22 is coaxially and airtightly attached to the gas inlet 2 of the upper case 4 via a union screw 21. A second cylinder 24 having a nozzle 23, which is a valve seat, formed on the bottom of the first cylinder 22 is coaxially and airtightly screwed through a rubber packing 25. A support shaft 26 is rotatably supported at a right angle in the axial direction of the second tubular body 24 via a bearing 27, and the support shaft 26 is supported at a right angle to the support shaft 26. The eccentric cam 28 is fixed. The support shaft 26 is provided with packing 29, and the bearing 27 is provided with packing 3.
Each of them is hermetically sealed to the outside by 0. Further, one end of the support shaft 26 on the side supported by the bearing 27 projects outside the second tubular body 24, and a handle 31 is fixed to the projecting end.

Below the eccentric cam 28, at the lower end, a pressing portion 32 having a tapered surface capable of contacting the outer circumference of the valve body 8 of the shutoff valve 7 is provided.
The movable valve 33, which is a rod member provided with
It is arranged on the axis of 4. A valve element 34 is provided at the upper end of the movable valve 33 at right angles to the axial direction, and a coiled spring 35 is mounted between the outer periphery of the lower surface of the valve element 34 and the inner bottom surface of the second tubular body 24. In addition, the upper surface of the valve element 34 is urged so as to contact the outer periphery of the eccentric cam 28. Further, the movable valve 33 is in contact with the inner circumference of the first cylindrical body 22 and is supported to be movable up and down. Further, the valve rubber 3 is provided on the lower surface of the valve body 34.
6 is attached, and when the movable valve 33 descends, the movable valve 33 comes into contact with the nozzle 23 provided at the upper end of the first tubular body 22. In addition, in the outer peripheral portion of the valve element 34 and the inner peripheral portion of the nozzle 23, the holes 3 serving as gas passages are formed.
4a and 23a are formed.

FIG. 1 shows a state in which the shutoff valve 7 is activated and the valve body 8 closes the nozzle 6. When the shutoff valve 7 is returned from this state, the handle 31 is rotated 180 degrees and the movable valve 33 is pushed down by the eccentric cam 28. As a result, the taper surface of the pressing portion 32 moves the valve body 8 to the right in the drawing,
The nozzle 6 is detached. At the same time, the valve element 34 provided on the movable valve 33 closes the nozzle 23 of the second cylindrical body 24 to prevent the inflow of gas and prevent self-damage. After latching the shutoff valve, the handle 31 is returned to the original position and the nozzle 3 is opened.

Reference numeral 37 is a joint pipe taper screw which is hermetically connected to the upper end of the second tubular body 24 via a packing 38, and connects the gas supply pipe (not shown) to the second tubular body 24. is there.

According to this embodiment, since the valve return function is provided in the joint on the gas inlet 2 side, it can be commonly used for both left and right models of the pipe of the upper case 4 of the gas meter.
Therefore, it is not necessary to provide a valve opening / closing mechanism on the upper case, the shape is simplified, the cost is reduced, and the automatic assembly is facilitated. Furthermore, the self-damage prevention mechanism can be easily attached, and the valve opening / closing mechanism can be easily removed.

[0025]

As described above, according to the present invention, since the valve opening / closing mechanism is provided in the tubular body that serves as the joint on the gas inlet side of the upper case, it can be shared by the left and right models of the upper case piping. In addition, the shape of the upper case can be simplified and the cost can be reduced, and the automatic assembly can be facilitated. Moreover, the self-damage prevention mechanism can be easily attached, and the valve opening / closing mechanism can be easily removed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of the present invention.

FIG. 2 is a front view showing an example of a conventional gas meter.

FIG. 3 is a vertical cross-sectional view showing a main part of an example of a conventional valve opening / closing mechanism.

[Explanation of symbols]

 1 Lower Case 2 Gas Inlet 3 Gas Outlet 4 Upper Case 5 Gas Flow Path 7 Shutoff Valve 8 Valve Body 22 First Cylindrical Body 23 Valve Seat (Nozzle) 24 Second Cylindrical Body 28 Eccentric Cam 32 Pressing Part 33 Rod Member ( Movable valve) 34 Valve part (valve body)

Claims (1)

(57) [Scope of utility model registration request] 1. A lower case having a built-in metering unit, a shut-off valve having a gas inlet and a gas outlet, which has an integrating mechanism unit built therein and which opens and closes a gas flow path between the gas inlet and the metering unit. A valve opening / closing mechanism provided in a gas meter with a built-in shutoff valve and having a built-in upper case, for opening / closing the shutoff valve from outside the meter, wherein the gas inlet and the gas supply pipe are coaxially and airtightly connected. No. 2 cylinder and a first cylinder on the gas inlet side so as to be slidable in the axial direction, and has a pressing portion for axially pressing the valve body of the shutoff valve at one end and the other end at the other end. A rod member having a valve portion that opens and closes a valve seat provided at an end portion of the second cylinder body on the gas inlet side, and one end on the valve portion side of the rod member that is pivotally supported by the first cylinder body. An eccentric cam that comes into contact with the rod portion by rotating the eccentric cam from the outside. A valve opening / closing mechanism for a gas meter with a built-in shutoff valve, comprising: pressing a material to move and open the valve body of the shutoff valve, and closing the valve portion of the second tubular body.