JP6495582B2 - Membrane gas meter using electronic metering system - Google Patents

Description

  The present invention relates to an electronic metering type membrane gas meter in which a control chamber is formed on the front side of an upper case of a gas meter main body to accommodate electronic equipment such as a pressure sensor or electrical components such as an electronic circuit.

  A conventional electronic metering membrane gas meter is shown in FIG.

  In FIG. 6, reference numeral 100 is composed of an upper case 101 and a lower case 102. Inside the upper case 101 is a machine room 104 in which a crank mechanism 105 and the like are assembled by a partition wall 103, an electromagnetic valve, a seismic device 107 and the like. The control chamber 106 is partitioned, a permanent magnet 108 is attached to the crank mechanism 105 side, and a magnetic sensor 109 is attached to the control chamber 106 side.

In the upper case 101, the back of the control chamber 106 is open, and a back cover 111 having a shape bulging rearward is attached to the open port 110.
In the case back 111, 112 indicates a vent hole.

In the conventional membrane gas meter described above, the following problems have occurred.
1. Rainwater and small insects sometimes entered the control chamber from the vent 112 of the back cover 111 of the control chamber 106.
2. Since the back cover 111 of the control room 106 travels backward, there may be interference with each other when there is equipment such as piping behind the gas meter, which may restrict the mounting position. .
3. Since the rear side of the control room 106 is open, when a failure or the like occurs in an electronic component or the like, the back cover 111 may be opened to repair or replace the component.

  The present invention is provided in view of the problems as described above, and prevents rainwater and insects from entering the control room, and even if there are obstacles such as piping behind the gas meter. It is an object of the present invention to provide an electronic metering type membrane gas meter that can repair or replace electronic components.

In order to describe the above object, the invention described in claim 1 is an electronic metering type membrane gas meter. In the upper case 2 of the gas meter main body 1, a machine chamber 15 is formed in the lower stage by a partition wall 16. this control chamber 4 together with the control chamber 4 for assembling electronic components are formed is provided the air introducing structure for introducing outside air, the air introducing structure front opening of the control chamber 4 Toko control chamber 4 The air introduction structure is formed between the joint edges 2a and 5a of the front cover 5 that covers the air, and the air introduction structure has an air introduction opening 7 that opens to the atmosphere, a ventilation passage 6 that follows this, and a ventilation opening that opens to the control chamber 4 together consist of 8, wherein the ventilation passage 6 a membrane type gas meter of the electronic weighing system vent filter 10 slit 11 whose width is set to be no greater than 0.20mm is formed is attached, the air inlet Lower buffer 9 a for the ventilation path 6 to absorb the sudden change in ventilation pressure to expand the portion of the middle between reaching the ventilation filter 10 is formed from a barrier 17 on the upper portion of the lower buffer 9a An upper buffer 9b is formed between the upper buffer 9b, a ventilation filter 10 is attached to the front of the upper buffer 9b, and an air inlet 7 is formed at the bottom of the lower buffer 9a. The outside air flowing in from the port 7 flows into the upper buffer 9b through the lower buffer 9a and passes through the filter 10 attached to the front of the upper buffer 9b formed in the upper portion and passes through the S-shaped flow path. Then, it is configured to flow into the control chamber 4 through the vent hole 8 formed in the upper buffer 9b .

  According to the present invention, in the structure for introducing air into the control chamber 4, outside air flows into the air passage 6 from the air introduction port 7, and air is introduced into the control chamber 4 from the air vent 8. As heat and moisture in the chamber 4 are released into the atmosphere, dew condensation occurs in the control chamber 4 and the inside of the control chamber 4 is heated to adversely affect electronic components such as electronic devices and electronic circuits. Can be prevented.

Further, since the lower buffer 9a and the upper buffer 9b are provided in the air passage 6, even if a large differential pressure is generated between the control chamber 4 and the outside, this differential pressure is increased by the wide buffer 9a, Since it is absorbed and eliminated by the action of the space 9b , it is possible to prevent rainwater and the like from being sucked into the control chamber 4 by the action of negative pressure.

  In addition, by setting the width of the ventilation slit of the ventilation filter 10 to 0.20 mm or less, it is possible to prevent small insects from entering.

  Further, since the atmosphere introduction port 7 is provided at the joint 2a, 5a of the control chamber 4 and the front cover 5 in the upper case 2 and at the lower part of the protrusion of the control chamber 4 and the front cover 5, rainwater, dust, etc. It is possible to prevent the control chamber 4 and the front cover 5 from being blocked and entering the air passage 6 from the air introduction port 7 by being blocked.

  Further, by forming the control chamber 4 on the front side of the upper case 2 and eliminating the protruding back cover behind the control chamber 4 as in the prior art, the piping behind the gas meter does not become an obstacle to the gas meter. At the same time, when a failure occurs in an electronic component or the like, the front cover 5 can be removed and the component can be repaired or replaced from the front of the gas meter.

Partially cutaway front view of a gas meter embodying the present invention Explanatory drawing of air introduction structure Sectional view of the upper case showing the control room and air introduction structure in the upper case Cross section of the gas meter showing the structure of the control room Explanatory drawing of another structural example of air introduction structure Illustration of the control room of a conventional gas meter

  Embodiments of the present invention described in claims 1 to 4 will be described in detail with reference to FIGS.

  FIG. 1 is a front view of a gas meter in which a part of a front cover is cut away so that a control chamber and an atmosphere introduction structure can be understood. Reference numeral 1 denotes a gas meter body, 2 denotes an upper case, and 3 denotes a measuring chamber inside. It is the lower case which formed 3a.

  In the upper case 2 described above, a machine room 15 in which the crank mechanism shown in FIGS. 3 and 4 is accommodated, and an electronic device partitioned by the machine room 15 and a partition wall 16 (see FIGS. 3 and 4). A control chamber 4 in which 18 or the like is accommodated is formed, and the front side of the control chamber 4 is open to the whole inside the upper case 2, and there is no protrusion at the rear portion of the upper case 2.

  Reference numeral 5 denotes a front cover that covers the front surface of the upper case 2, and the front cover 5 has a peripheral edge 5 a that is connected to a peripheral edge 2 a on the upper case 2 side via a packing 12 as shown in FIG. (FIG. 1).

Reference numeral 6 denotes an air passage in the atmosphere introduction structure according to the present invention, and the inlet (atmosphere introduction port 7) of the air passage 6 is clearly shown in FIGS. In the peripheral edges 2a and 5a that are in close contact with each other, they are hidden under the upper case 2 and the front cover 5 and are located below the left corner when the gas meter body 1 is viewed from the front. Further, air passage 6, and the lower buffer 9 a which is formed by setting a large part area of the formed flow path so as to face the front and the front cover 5 side of the air inlet 7 and the upper case 2, the flow forming a barrier 17 the road leading to ventilation filter 10 by bending the air passage 6, and has a subsequent inflow to that flow path configuration to the upper buffer 9b.

  The ventilation filter 10 is formed with a ventilation slit 11 having a width of at least 0.20 mm (below) capable of preventing insects from entering, and is located in front of the ventilation hole 8 in the ventilation path 6. 2 and the cover 5 are attached between the joints (peripheries 2a and 5a), and a packing 12 is assembled around the ventilation filter 10, and the periphery of the ventilation filter 10 is sealed.

  FIG. 5 shows another embodiment of the air introduction structure. However, illustration of the packing 12 around the ventilation filter 10 is omitted.

As described above, in the air introduction structure of the present invention, the air introduction port 7 is formed at a position hidden under the upper case 2 and the front cover 5, and a barrier 17 is formed in the air passage 6. the has a rainwater infiltrates difficult shape like wind, rain penetration by variation of the sudden pressure (negative pressure) further by the presence of the lower buffer 9 a and the upper buffer 9b is or is sucked into the control chamber 4 in Thus, troubles of electronic devices can be prevented.

  Moreover, since there is no protrusion at the rear part of the upper case 2, the piping behind does not become an obstacle when the gas meter is installed.

1 Gas meter body 2 Upper case 3 Lower case 4 Control room 5 Front cover 6 Ventilation path 7 Air introduction port 8 Vent port 9 a Lower buffer
9b Upper buffer 10 Ventilation filter 11 Ventilation slit 12 Packing 16 Partition wall

Claims (1)

In the upper case 2 of the gas meter main body 1, a machine room 15 is formed in the lower stage by a partition wall 16, and a control room 4 for assembling electronic components is formed in the upper stage, and outside air is introduced into the control room 4. air introducing structure is provided, this air introduction structure mutual connection edges 2a of the cover 5 before covering the front opening of the control chamber 4 of the control chamber 4 Toko, formed between 5a, also the air introducing structure The air inlet 7 that opens to the atmosphere, the air passage 6 that follows this, and the air vent 8 that opens to the control chamber 4, and the air passage 6 has a slit 11 whose width is set to 0.20 mm or less. An electronic metering membrane gas meter to which the formed ventilation filter 10 is attached,
Is lower buffer 9 a is formed for the air passage 6 to absorb the abrupt fluctuation of the ventilation pressure to expand the portion of the middle between reaching the ventilation filter 10 from the air inlet 7, the upper portion of the lower buffer 9a An upper buffer 9b is formed with a barrier 17 in between, and a ventilation filter 10 is attached to the front of the upper buffer 9b, and an air inlet 7 is formed at the bottom of the lower buffer 9a. The outside air flowing in from the atmosphere introduction port 7 passes through the lower buffer 9a and passes through the filter 10 attached to the front of the upper buffer 9b formed on the upper buffer 9a along the S-shaped flow path. Configured to flow into 9b and then flow into control chamber 4 through vent 8 formed in upper buffer 9b.
An electronic metering membrane gas meter characterized by

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