JPH0613457Y2 - Display mechanism of gas meter with built-in shutoff valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to improvement of a display mechanism for displaying valve opening / closing of a gas meter with a built-in shutoff valve.

(Prior Art) Previously, the present applicant assembled a solenoid type shutoff 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 things such as a gas leak detector and a seismic sensor. We have developed a mechanism that operates the shutoff valve in tandem with the output of the device to shut off the gas flow path inside the meter.

The advantage of this structure is that the gas can be shut off at the gas source, but in this type of gas meter, it is inevitably necessary to attach a mechanism for displaying the shutoff state.

As this display mechanism, a mechanical display mechanism is generally used, and a display rod facing the valve body of the shutoff valve with a nozzle sandwiched is provided, and the rod is constantly moved toward the valve body side by a relatively weak biasing force. Keep urging. The other end of this rod penetrates the case and protrudes to the surface of the case, and its end is seen through to the display window side. Alternatively, the paint color is hidden.

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, in the cutoff state, the rod projects to the display surface of the case to indicate that it is in the cutoff state.

(Problems to be solved by the invention) However, in this display mechanism, since the rod penetrates the case slidably, it is necessary to hermetically seal the penetrating portion. The double and triple airtightness is maintained by using such as, but if the seal is strictly performed in this way, the sliding resistance increases, and when the shutoff valve protrudes, the shutoff valve has a large resistance. However, there is a drawback that it is necessary to set a large operating torque.

In other words, this type of gas meter has a built-in battery for long-term operation as a power source, and the solenoid that consumes the maximum amount of power is designed to be as small and power-saving as possible, and various types of built-in gas meters Functional parts must be designed to withstand long-term use. For that purpose, it is necessary to minimize the mechanical loss caused by the constant contact of the rod.

However, if the sliding resistance is large as described above, it becomes a big obstacle for downsizing of the solenoid and power consumption reduction.

This invention solves the above problems, and its purpose is to allow the rod to be indirectly displayed without penetrating the case, thereby eliminating sliding resistance due to the seal of the penetrating portion and reducing the solenoid. The present invention provides a display mechanism of a gas meter with a built-in shutoff valve that can be operated by operation.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the display mechanism of the gas meter with a built-in shutoff valve of the present invention has a built-in membrane type suction / discharge mechanism for sucking and discharging gas, In addition, a case that has a built-in integrating mechanism section that converts the intake / exhaust operation of the intake / exhaust mechanism into rotation and displays the integrated value, and that is provided with a gas inlet port and a gas exhaust port, and a nozzle that defines a gas flow path in the case A valve body of a shut-off valve arranged on one side, a rod arranged on the other side of the nozzle so as to be able to move forward and backward and abut on the valve body, and an operating magnet provided on the operating end side of the rod. A display magnet, which is on the front surface side of the case and is loosely fitted and held so as to face the operation magnet, and a display window through which the display magnet can be seen outside. Serial approach of the actuating magnets, the repulsive or suction operation of both the magnet in accordance with the separating operation, characterized in that the display magnet configured as allowed to toward and away from the display window side.

(Operation) The rod and the display portion on the surface of the case are mechanically completely isolated, and there is no penetration of the sliding portion. When the operation magnet provided on the rod side approaches the display magnet, the display magnet floats up due to the repulsion of the magnetic force between the same poles, and approaches the display window to indicate that it is in the operating state.
Further, when the valve body retracts and the rod advances, the actuation magnet separates from the display magnet.

Therefore, the display magnet is separated from the display window portion by its own weight or other biasing means to display the released state.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

In the figure, a gas meter 10 is one in which an upper case 12 and a lower case 14 are hermetically connected via flanges 12a and 14a.

A gas inlet port 16 and an outlet port (not shown) are provided on both upper sides of the upper case 12, and the inlet port 16
Gas introduced from the upper case 12 to the lower case 14
Inside, the membrane plate (not shown) for driving the meter installed in the lower case 14 is expanded and contracted, and then supplied again from the outlet port to the end device side through the upper case 12.

Then, the expansion / contraction force of the membrane plate is taken out via a power transmission mechanism (not shown) arranged in the upper case 12, and is cumulatively displayed as a gas consumption amount in a cumulative chamber 18 provided on the front surface of the upper case 12. ing.

A nozzle 20 that connects the upper case 12 to the front and the rear is arranged at a lower portion of the inlet port 16 so as to be orthogonal to the inlet port 16.

A solenoid type shutoff valve 22 is provided on the gas upstream side of the nozzle 20.
Are arranged.

The shutoff valve 22 includes a solenoid 22a that is airtightly fixed to the back surface of the upper case 12, and a valve body 22b that projects from the upper end of the solenoid 22a and faces the nozzle 20.

The solenoid 22a is interlocked with a gas leak detector, a vibration sensor, etc., and has a function of projecting by a cutoff pulse signal from a control unit (not shown) according to the detection output of one or more of these. is doing.

The valve body 22b is opposed to the valve body 22b across the nozzle 20, that is, the tip end of a rod 26 for display operation supported by a U-shaped bracket 24 on the gas downstream side.

A spring 28 that constantly urges the rod 26 toward the protruding side is interposed in the protruding portion of the rod 26 from the bracket 24, and always urges the rod 26 toward the forward side.

Inside the bracket 24, a cone-shaped cam 30 is provided integrally with the outer peripheral portion of the rod, and a cam floor rod 32 that vertically penetrates the shoulder portion of the upper case 12 is in contact with the cam 30.

An operating magnet 34 is integrated with the protruding end of the cam floor rod 32 from the shoulder portion, and a display case 36 airtightly joined to the shoulder portion is provided on the peripheral edge thereof.

A cap 40 made of a transparent material is arranged above the display case 36 with a waterproof packing 38 interposed therebetween, and a display magnet 42 is loosely fitted inside the cap 40 so as to be vertically movable. The bottom surface of the display magnet 42 has the same polarity as the operation magnet 34. Since the case 36 is completely shielded from the outside, it is not necessary to provide a special sealing means on the penetrating portion of the cam floor rod 32.

In FIG. 1, the valve body 22b of the shutoff valve 22 is retracted and the nozzle 20 is opened.

According to this state, the rod 26 advances, and as a result, the cam floor rod 32 slides on the lowest position of the cam 30 and descends to the lowest position. Therefore, the magnetic force of the actuating magnet 34 does not act on the display magnet 42, and the display magnet 42 is in the lowest position of the cap 40.

When the solenoid 22a is excited from this state and the valve body 22b projects to close the nozzle 20, the rod 26 retracts as shown in FIG. 2, and the cam 30 also retracts accordingly, so that the cam floor rod 32 Ascending, the operating magnet 34 approaches the display magnet 42. With this approach, a repulsive magnetic force is generated between the two, and the loosely fitted display magnet 42 rises in the cap 40, approaches the display window 40a on the top surface of the cap 40, and is shut off. indicate.

When the valve body 22b returns to the original position from this state, the operating magnet 34 descends again as shown in FIG. 1, and the display magnet 42 descends by its own weight to indicate that the valve is open. .

3 and 4 show a second embodiment of this invention.

In the figure, the portions corresponding to those in the first embodiment are designated by the same reference numerals, and only the essential portions will be described.

In the figure, the rod 26 is provided inside the bracket 24.
Operating magnet 3 integrated into the holder via a holder 50
4 is held and movable along the shoulder ceiling surface of the upper case 12.

Further, a concave portion 52 for accommodating the display magnet 42 is integrally formed on the shoulder portion of the upper case 12, and the display magnet 42 is loosely fitted in the concave portion 52 so as to be vertically movable, and the cap 54 is screwed. It is fixed together. The material of the upper case 12 is aluminum die-cast, which is a non-magnetic material, and therefore has no effect on the magnetic field between the magnets 34 and 42.

Therefore, in this embodiment, the actuating magnet 34 moves backward as the rod moves backward and approaches the lower surface of the display magnet 42. As a result, the repulsive magnetic force of the two causes the display magnet 42 to rise and the cap 54 to move. It is displayed on the display window 54a at the top of the display that it is in the operating state.

Further, in this embodiment, since the magnet is directly operated by the advancing / retreating operation of the rod, there is no mechanical loss as compared with the above embodiment in which the power transmission means such as the cam is provided
The mechanism itself will be further simplified.

[Advantages of the Invention] As described in detail in the above embodiments, in the present invention, the rod and the display portion on the surface of the case are completely separated from each other, and a sealing means corresponding to the penetration of the sliding portion is unnecessary. Therefore, the sliding resistance during the operation of the valve body can be reduced.

Therefore, according to the present invention, a reliable operating state can be obtained even if the output of the solenoid is relatively small, and it is suitable for downsizing and power saving of this type of gas meter with a gas shutoff function.

[Brief description of drawings]

1 is a partially cutaway side view of a gas meter according to a first embodiment of the present invention, FIG. 2 is a partially enlarged sectional view showing a cut-off display state, and FIG. 3 is a partial sectional view showing a second embodiment of the present invention. ,
FIG. 4 is a partially enlarged sectional view showing a cut-off display state. 10 ... Gas meter 12 ... Upper case 14 ... Lower case 16 ... Gas inlet port 18 ... Accumulation chamber 20 ... Nozzle 22 ... Shutoff valve 22b ... Valve body 26 ... Rod 34 ... Operating magnet 42 ... Display magnet

Claims (1)

[Scope of utility model registration request] 1. A built-in membrane type intake / exhaust mechanism for intake / exhaust of gas, and an integrated mechanism section for converting the intake / exhaust operation of the intake / exhaust mechanism into rotations for integration display, and a gas inlet port and gas. A case provided with an exhaust port, a valve body of a shut-off valve arranged on one side of a nozzle defining a gas flow path in the case, and a valve body capable of advancing and retracting to the other side of the nozzle and abutting on the valve body. A rod that is movably arranged, an operating magnet that is provided on the operating end side of the rod, a display magnet that is on the surface side of the case and that is loosely fitted and held facing the operating magnet, The display magnet is provided with a display window through which the display magnet can be seen outside, and the display magnet is repulsed or attracted according to the approaching or separating operation of the operating magnet with respect to the display magnet. Display mechanism of the cutoff valve internal gas meter, characterized by being configured as allowed to toward and away from the net to the display window side.