CN210952977U

CN210952977U - Explosion-proof card membrane type gas meter

Info

Publication number: CN210952977U
Application number: CN201921817565.3U
Authority: CN
Inventors: 肖云
Original assignee: Jiangxi Hongtong Electronic Technology Co ltd
Current assignee: Jiangxi Hongtong Electronic Technology Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-07-07
Anticipated expiration: 2029-10-28

Abstract

The utility model relates to a diaphragm type gas table technical field provides an explosion-proof card diaphragm type gas table to guarantee that the gas table is in safe atmospheric pressure state all the time, seals the unusual high pressure that appears suddenly before the gas table, prevents that the gas table from appearing the problem of bursting, include the watchcase that comprises upper casing, lower casing and block step, link up on the front wall of watchcase and install the counter box, counter, power module and wireless radio frequency transmitter I are put to the counter box, the upper end of watchcase is equipped with gas import and gas export, install explosion-proof equipment on the gas import, the upper end of explosion-proof equipment is equipped with card display counter, the inner chamber lower part of watchcase is equipped with two batch meters, and the inner chamber of batch meter is vertical to be equipped with the involucra; the utility model discloses be particularly useful for the safe explosion-proof of IC-card membrane formula gas table, have higher commercial prospect.

Description

Explosion-proof card membrane type gas meter

Technical Field

The invention relates to the technical field of membrane type gas meters, in particular to an explosion-proof membrane type gas meter.

Background

The fuel for people to cook in daily life is converted from the conventional energy sources with serious waste and pollution, such as firewood, coal and the like, into natural gas, coal gas, even clean energy sources, such as electricity and the like. The gas meter plays a role, and the automatic accumulation function of the gas meter enables people using natural gas or pipeline gas to conveniently know how much gas is used, so that the gas meter can pay according to the cubic meter consumed every month.

The diaphragm gas meter is a kind of gas meter, and refers to a positive displacement mechanical meter, which is a metering system composed of two containers (metering boxes). Each container is flanked by a concave diaphragm-again dividing each container into two metering chambers of complementary shape. The driving force of the movement of the diaphragm depends on the gas pressure difference at the inlet and the outlet of the gas meter. Under the action of pressure difference, the diaphragm makes continuous alternate motion to drive two groups of slide valves to continuously divide the gas filled in the metering chamber into single metering volumes (circulating volumes) and discharge the single metering volumes to the outlet, and the single metering volumes are counted by connecting the two groups of slide valves with a counter through a mechanical transmission mechanism, so that the total gas flowing through the pipeline is measured. The card membrane type gas meters in the current market are all electromechanical integrated intelligent prepayment gas metering instruments. The diaphragm gas meter is provided with a card display meter for swiping card to meter the used gas.

The gas meter is the weakest link bearing pressure in a gas pipe network, and can only bear limited gas pressure, once the gas pressure exceeds the designed limit pressure of the gas meter, the gas meter can deform and burst to cause gas leakage, and can burn or even explode when exposed fire occurs, meanwhile, a circuit is arranged in the gas meter, when the circuit has problems, high temperature and spark can be caused to generate combustion or even explode, most of the existing gas meters can only be used for recording use data, the function is single, and effective reaction can not be carried out on the use condition, so that how to ensure that the gas meter is always in a safe state is realized, the abnormal condition which suddenly occurs is solved in front of the gas meter, and the key for preventing the gas meter from bursting is realized.

Therefore, an explosion-proof card membrane type gas meter is provided.

Disclosure of Invention

(1) Technical problem to be solved

The invention aims to overcome the defects of the prior art, adapt to the practical requirements, and provide an anti-explosion diaphragm type gas meter so as to ensure that the gas meter is always in a safe gas pressure state, seal the sudden abnormal high pressure in front of the gas meter and prevent the gas meter from bursting.

(2) Technical scheme

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

an anti-explosion card membrane type gas meter comprises a meter shell consisting of an upper shell, a lower shell and a clamping step, wherein a counter box is installed on the front wall of the meter shell in a penetrating manner, a counter, a power supply module and a wireless radio frequency transmitter I are arranged in the counter box, a gas inlet and a gas outlet are formed in the upper end of the meter shell, an anti-explosion device is installed on the gas inlet, a card display meter is arranged at the upper end of the anti-explosion device, two metering boxes are arranged at the lower part of an inner cavity of the meter shell, a leather membrane is vertically arranged in the inner cavity of each metering box, a left slide valve and a right slide valve are respectively installed at the upper ends of the two metering boxes, the left slide valve and the right slide valve are connected with the input end of the counter through crank connecting;

the explosion-proof device comprises a valve body, a fuel gas inlet pipe arranged on the side wall of the valve body, an upper threaded pipe and a buckling piece, wherein the upper threaded pipe and the buckling piece are respectively arranged at the upper end and the lower end of the valve body;

the valve body includes valve body shell and valve body shell inner chamber slidable mounting's sealed valve plug, the output of small-size cylinder is installed to the upper end of sealed valve plug, and small-size cylinder fixed mounting is on the interior roof of valve body shell.

Preferably, the fastening piece comprises an inner insertion connecting pipe which is installed at the lower end of the valve body shell in a penetrating mode, the lower end of the inner insertion connecting pipe reaches the inner cavity of the first sleeve and is provided with a table-shaped nozzle, the upper portion of the side wall of the inner insertion connecting pipe is sequentially sleeved with a limiting sleeve and a hexagonal inner thread sleeve from top to bottom, and the hexagonal inner thread sleeve is installed on the upper portion of the first sleeve in a threaded mode.

Preferably, the pressure valve-changing assembly comprises an upper valve-changing component and a lower valve-changing component which are matched with each other, the upper valve-changing component comprises an air inlet sliding pipe which is inserted in the table-shaped nozzle in a penetrating manner, the lower end of the air inlet sliding pipe is provided with an electromagnetic ring, the air inlet sliding pipe is sleeved with a telescopic spring, and two ends of the telescopic spring are respectively connected with the lower end of the table-shaped nozzle and the upper end of the electromagnetic ring;

the lower valve changing component comprises a driven gear which is rotatably installed on the inner bottom wall of the connecting shell, the upper end edge of the driven gear is provided with a plurality of valve core pipes matched with the air inlet sliding pipe, a rubber air sealing ring is sleeved on the annular outer wall of each valve core pipe, a permanent magnetic ring is sleeved on each valve core pipe, the permanent magnetic rings are fixedly installed at the upper end of the driven gear, the permanent magnetic rings are multiple, prefabricated air ports penetrating through the driven gear and different calibers are formed in the middle of each valve core pipe, the driven gear is meshed with a driving gear, the driving gear is installed at the output end of the motor, and the motor is fixedly installed on the inner wall of the second.

Preferably, the upper end of motor is equipped with explosion-proof control assembly, explosion-proof control assembly is including setting up the explosion-proof circuit board in the motor upper end, and the upper end matrix distribution of explosion-proof circuit board has four explosion-proof TVS diodes, and four explosion-proof TVS diodes establish ties each other, two positive and negative pole connectors are installed to the upper end both sides of explosion-proof circuit board, the upper end of explosion-proof circuit board still is equipped with wireless radio frequency transmitter II.

Preferably, a plurality of the preformed gas ports are distributed in an annular array, and the inner diameters of the plurality of the preformed gas ports are sequentially arranged from top to bottom.

Preferably, the lower end of the driving gear is provided with a lower annular sleeve, the lower annular sleeve is fixedly mounted on the inner wall of the first sleeve, and a middle air hole of the lower annular sleeve is matched with the inner diameter of the prefabricated air port.

Preferably, the card display meter comprises a display metering shell, a display screen arranged at the front end of the display metering shell and a magnetic card induction area, the magnetic card induction area is located below the display screen, a capacitance induction circuit is arranged in the magnetic card induction area, and a wireless radio frequency receiver and a PLC (programmable logic controller) are arranged in the display metering shell.

Preferably, install first pressure sensor and second pressure sensor on gas advances pipe and the gas outlet respectively, first pressure sensor and second pressure sensor all with PLC controller electric connection.

Preferably, the upper housing, the lower housing and the engaging step are all made of explosion-proof material members.

Preferably, the upper parts of the annular side walls of the first sleeve and the second sleeve are fixedly sleeved with inner fixing plates, and the inner fixing plates are fixedly mounted on the inner top wall of the upper shell through screws.

(3) Has the advantages that:

1. this gas table monitors gas inlet and gas outlet both sides atmospheric pressure through pressure sensor, and monitoring data compares through the PLC controller with in the database relatively, judges the pressure of admitting air and giving vent to anger to effectively adjust the air input of gas, guarantee that pressure is in the bearable within range of gas table, effective explosion-proof.

2. According to the diaphragm gas meter, through the arrangement of the explosion-proof device, when the pressure of a pipeline is in an adjustable range, different prefabricated gas ports are changed to adjust the pressure of gas inlet; when the pipe pressure is too large and exceeds the adjustable range, the valve body is controlled to be closed, and the membrane type gas meter is protected.

3. The card membrane type gas meter effectively receives the gas use value of a counter transmitted by a wireless radio frequency transmitter I through the arrangement of a card display meter, combines the recharge value sensed by a capacitance sensing circuit, and automatically closes a valve body when the gas quantity is insufficient; meanwhile, the circuit condition transmitted by the wireless radio frequency transmitter II can be effectively received, and the safety of the circuit is judged by combining the PLC.

4. The explosion-proof card membrane type gas meter starts from two aspects of air inlet pressure and circuit control through the combined structure of the pressure valve replacing component and the explosion-proof control component, so that the pressure in the gas meter is under the set pressure, and the circuit is safe, thereby protecting the gas meter from being damaged.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the structure of the watch body according to the present invention;

FIG. 3 is a schematic view of the external appearance of the explosion-proof device of the present invention;

FIG. 4 is a schematic structural view of an explosion-proof device according to the present invention;

FIG. 5 is a top view of the lower valve member of the present invention;

FIG. 6 is a schematic structural diagram of an explosion-proof control assembly according to the present invention;

fig. 7 is a top view of the structure of fig. 4.

In the figure: the explosion-proof device comprises an upper shell 1, a lower shell 2, a clamping step 3, a counter box 4, a fuel gas outlet 5, an explosion-proof device 6, a valve body 61, a valve body shell 611, a small cylinder 612, a sealing valve plug 613, a fuel gas inlet pipe 62, an upper threaded pipe 63, a fastening piece 64, an inner insertion pipe 641, a hexagonal inner threaded sleeve 642, a limiting sleeve 643, a table-shaped nozzle 644, a first sleeve 65, a connecting shell 66, a pressure change valve assembly 67, an air inlet sliding pipe 671, a telescopic spring 672, an electromagnetic ring 673, a permanent magnetic ring 674, a valve core pipe 675, a driven gear 676, a prefabricated air port 677, a driving gear 678, a motor 679, a rubber air sealing ring 670, a second sleeve 68, an explosion-proof control assembly 69, an explosion-proof circuit board 691, an explosion-proof TVS diode 692, a positive and negative electrode joint 693, a wireless radio frequency emitter II 694, an upper pipe cover 610, a first pressure sensor 7, a second pressure sensor 8, Display screen 92, magnetic card induction zone 93, involucra 10, left slide valve 11, right slide valve 12, crank connecting rod 13, batch meter 14, inner fixed plate 15, lower annular cover 16.

Detailed Description

The invention will be further illustrated with reference to the following figures 1 to 7 and examples:

the utility model provides an explosion-proof card membrane gas table, includes the watchcase of compriseing upper casing 1, lower casing 2 and block step 3, link up on the antetheca of watchcase and install counter box 4, counter box 4 embeds there is counter, power module and wireless radio frequency transmitter I, the upper end of watchcase is equipped with gas import and gas export 5, install explosion-proof equipment 6 in the gas import, explosion-proof equipment 6's upper end is equipped with card display meter 9, the inner chamber lower part of watchcase is equipped with two batch meters 14, and the vertical involucra 10 that is equipped with of inner chamber of batch meter 14, two left sliding valve 11 and right sliding valve 12 are installed respectively to the upper end of batch meter 14, all connect the input of counter on left sliding valve 11 and the right sliding valve 12 through crank connecting rod 13, two the output of batch meter 14 all with gas export 5 through connections.

In the embodiment, as shown in fig. 2, the gas entering the meter case enters the gas chamber in the inner cavity of the metering box 14 through the gas distribution valve on the metering box 14, the gas filled into the gas chamber pushes and moves the membrane 10, the connecting plate fixed on the surface of the membrane 10 drives the vertical shaft to make reciprocating rotation motion, the vertical shaft drives the crank connecting rod 13 to move, thereby driving the left slide valve 11 and the right slide valve 12 on the two metering boxes 14 to make gas distribution and gas distribution conversion for each gas chamber, when the gas chamber on one side of the membrane 10 in the metering box 14 is inflated, the gas chamber on the other side of the membrane 10 is exhausted, the gas Vi gas on one side of the membrane 10 is exhausted in a reciprocating mode, the gas exhausted by the membrane 10 is 2 × 2Vi gas when the gas chambers on the left side and the right side of the membrane 10 of the two metering boxes 14 complete one reciprocating motion, which is called as a rotary volume Vc, one reciprocating cycle exhausts the gas of the volumes of the two metering boxes 14, the crank connecting rod 13 swings once to drive the output end of the counter to rotate, the reading of the counter is the volume of the exhausted gas, the volume of the counter, the counter is the volume of the counter, the counter i is combined with the counter.

In this embodiment, as shown in fig. 3, 4 and 6, the explosion-proof device 6 includes a valve body 61, a gas inlet pipe 62 installed on a side wall of the valve body 61, an upper threaded pipe 63 and a fastening member 64 installed at upper and lower ends of the valve body 61, respectively, the card display meter 9 is installed at an upper end of the upper threaded pipe 63 in a threaded manner, a lower portion of the fastening member 64 extends to an inner cavity of a first sleeve 65, the first sleeve 65 is fixedly inserted on the gas inlet, a connecting housing 66 is installed at a lower end of a side wall of the first sleeve 65 in a penetrating manner, a pressure changing valve assembly 67 is installed in the inner cavity of the connecting housing 66, the other end of the connecting housing 66 is installed in a penetrating manner to a lower portion of a side wall of a second sleeve 68, an upper end of the second sleeve 68 reaches an outer cavity of the case and is sleeved with an upper pipe cover 610, the upper pipe cover 610 can be effectively detached, combining fastening piece 64 to the fixed of first sleeve 65, the sealed entering watchcase of effectual assurance gas simultaneously, the setting of pressure trades valve module 67, can effectually get into the change of bore according to the effectual control of the pressure size of gas to the inside gas pressure of effectual control watchcase.

In this embodiment, as shown in fig. 4, the valve body 61 includes a valve body shell 611 and a sealing plug 613 slidably mounted in an inner cavity of the valve body shell 611, an output end of the small cylinder 612 is mounted on an upper end of the sealing plug 613, and the small cylinder 612 is fixedly mounted on an inner top wall of the valve body shell 611, and the small cylinder 612 is activated to push the sealing plug 613 to slide downward to block an input end of the gas inlet pipe 62, thereby cutting off the gas inlet.

In this embodiment, as shown in fig. 4, the fastening member 64 includes an inner insertion tube 641 installed through the lower end of the valve body housing 611, the lower end of the inner insertion tube 641 reaches the inner cavity of the first sleeve 65 and is installed with a table-shaped nozzle 644, the upper portion of the sidewall of the inner insertion tube 641 is sequentially sleeved with a limiting sleeve 643 and a hexagonal inner threaded sleeve 642 from top to bottom, and the hexagonal inner threaded sleeve 642 is installed on the upper portion of the first sleeve 65 in a threaded manner, so that the sealing connection between the valve body 61 and the first sleeve 65 is effectively ensured, the gas leakage is prevented, and the disassembly and the maintenance are convenient.

In this embodiment, as shown in fig. 4 and 5, the pressure change valve assembly 67 includes an upper valve change member and a lower valve change member that are matched with each other, and is effective to control the change of the inlet aperture according to the pressure of the gas, so as to effectively control the gas pressure inside the watch case, the upper valve change member includes an air inlet sliding pipe 671 that is inserted through the table nozzle 644, and an electromagnetic ring 673 is installed at the lower end of the air inlet sliding pipe 671, the air inlet sliding pipe 671 is sleeved with a telescopic spring 672, and the two ends of the telescopic spring 672 are respectively connected with the lower end of the table nozzle 644 and the upper end of the electromagnetic ring 673; the lower valve changing component comprises a driven gear 676 which is rotatably arranged on the inner bottom wall of the connecting shell 66, the upper end edge of the driven gear 676 is provided with a plurality of valve core pipes 675 which are matched with the air inlet sliding pipe 671, the annular outer wall of the valve core pipe 675 is sleeved with a rubber air sealing ring 670, the valve core pipe 675 is sleeved with a permanent magnet ring 674, the permanent magnet ring 674 is fixedly arranged at the upper end of the driven gear 676, the middle parts of the valve core pipes 675 are provided with prefabricated air ports 677 which penetrate through the driven gear 676 and have different calibers, the driven gear 676 is engaged with a driving gear 678, the driving gear 678 is arranged on the output end of a motor 679, the motor 679 is fixedly arranged on the inner wall of the second sleeve 68, the electromagnetic ring 673 is electrified to generate magnetism, the permanent magnet ring 674 which is positioned below the electromagnetic ring 673 is attracted, the air inlet sliding pipe 671 is driven to move downwards to be sleeved on the valve, the fuel gas enters the metering box 14 in the inner cavity of the meter shell through a prefabricated gas port 677 which is formed in the middle of the valve core pipe 675 and penetrates through the driven gear 676; when the gas inlet pressure of the gas inlet pipe 62 is increased or reduced, the valve body 61 is locked firstly, the electromagnetic ring 673 is powered off, the gas inlet sliding pipe 671 moves upwards under the resilience force of the extension spring 672, then the motor 679 drives the driving gear 678 to rotate, the prefabricated gas ports 677 with different calibers are matched in a rotating mode, then the gas inlet sliding pipe 671 descends, the valve body 61 is opened, gas enters after being subjected to pressure regulation through the prefabricated gas ports 677 with different calibers, and the pressure of the gas in the meter shell is effectively stabilized.

In this embodiment, as shown in fig. 4 and 6, an explosion-proof control assembly 69 is disposed at the upper end of the motor 679, the explosion-proof control assembly 69 includes an explosion-proof circuit board 691 disposed at the upper end of the motor 679, four explosion-proof TVS diodes 692 are distributed in a matrix at the upper end of the explosion-proof circuit board 691, the four explosion-proof TVS diodes 692 are connected in series, two positive and negative electrode connectors 693 are mounted at two sides of the upper end of the explosion-proof circuit board 691, a wireless radio frequency transmitter ii 694 is further disposed at the upper end of the explosion-proof circuit board 691, the two positive and negative electrode connectors 693 are used for connecting with solder pins of the motor 679, the solder pins of the motor 679 are inserted into the positive and negative electrode connectors 693 of the explosion-proof circuit board 691, so that the explosion-proof circuit board 691, the motor 9 and the explosion-proof TVS diodes 692 are connected together, thereby increasing the safety, the safety of the circuit is ensured.

In this embodiment, as shown in fig. 5, the plurality of the preformed gas ports 677 are distributed in an annular array, the inner diameters of the plurality of the preformed gas ports 677 are sequentially arranged from top to bottom, and the preformed gas ports 677 arranged regularly can effectively ensure that the rotation of the pressure change valve assembly 67 is matched with the adjustment of the gas pressure.

In this embodiment, as shown in fig. 4, the lower end of the driving gear 678 is provided with a lower annular sleeve 16, the lower annular sleeve 16 is fixedly installed on the inner wall of the first sleeve 65, and a middle air hole of the lower annular sleeve 16 is matched with the inner diameter of the preformed air port 677 to seal the upper part of the driven gear 676 to prevent gas leakage, and the matched preformed air port 677 is combined to control the entering amount of gas, so as to adjust the pressure of the inner cavity of the watchcase.

In this embodiment, as shown in fig. 1, the card display meter 9 includes a display meter casing 91, a display screen 92 disposed at the front end of the display meter casing 91, and a magnetic card sensing area 93, the display screen 92 is used for displaying the remaining air volume and the total air volume of the user, the magnetic card sensing area 93 is located below the display screen 92, a capacitance sensing circuit is arranged in the magnetic card sensing area 93, the capacitance sensing circuit of the magnetic card sensing area 93 is used for a user to swipe the air amount in the rechargeable card, the display and metering shell 91 is internally provided with a wireless radio frequency receiver and a PLC controller, in this embodiment, the PLC is in a Siemens S7-200 type, the wireless radio frequency receiver can effectively receive a gas use value of the counter transmitted by the wireless radio frequency transmitter I, and the valve body 61 is automatically closed when the gas amount is insufficient by combining a recharge value sensed by the capacitance sensing circuit; the wireless radio frequency receiver can effectively receive the circuit condition transmitted by the wireless radio frequency transmitter II 694, and the safety of the circuit is judged by combining the PLC controller.

In this embodiment, as shown in fig. 2 and 3, a first pressure sensor 7 and a second pressure sensor 8 are respectively installed on the gas inlet pipe 62 and the gas outlet 5, the first pressure sensor 7 and the second pressure sensor 8 are both electrically connected to the PLC controller, the first pressure sensor 7 and the second pressure sensor 8 respectively sense the pressure of the gas in the gas inlet pipe 62 and the gas outlet 5, and when the pipeline pressure is within an adjustable range, the PLC controller is combined to change different prefabricated gas ports 677 to adjust the pressure of the gas; when the pipe pressure is too large and exceeds the adjustable range, the control valve body 61 is closed, and the membrane type gas meter is protected.

In this embodiment, the upper housing 1, the lower housing 2 and the engaging step 3 are all made of explosion-proof material members, so that the pressure of the gas meter can be effectively strengthened from the outside.

In this embodiment, as shown in fig. 3 and 4, the upper portions of the annular side walls of the first sleeve 65 and the second sleeve 68 are fixedly sleeved with the inner fixing plate 15, and the inner fixing plate 15 is fixedly mounted on the inner top wall of the upper case 1 by screws, so as to effectively fix the mounting of the explosion-proof device 6 and seal the case for convenient mounting.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.

Claims

1. An anti-explosion card membrane type gas meter comprises a meter shell consisting of an upper shell, a lower shell and a clamping step, and is characterized in that a counter box is mounted on the front wall of the meter shell in a penetrating manner, a counter, a power supply module and a wireless radio frequency transmitter I are arranged in the counter box, a gas inlet and a gas outlet are formed in the upper end of the meter shell, an anti-explosion device is mounted on the gas inlet, a card display meter is arranged at the upper end of the anti-explosion device, two metering boxes are arranged at the lower part of an inner cavity of the meter shell, a membrane is vertically arranged in the inner cavity of each metering box, a left slide valve and a right slide valve are respectively mounted at the upper ends of the two metering boxes, the left slide valve and the right slide valve are connected with the input end of the counter through crank connecting rods;

2. The explosion-proof membrane gas meter of claim 1, wherein: the buckling piece comprises an inner inserting connecting pipe which is arranged at the lower end of the valve body shell in a penetrating mode, the lower end of the inner inserting connecting pipe reaches the inner cavity of the first sleeve and is provided with a table-shaped nozzle, a limiting sleeve and a hexagonal internal thread sleeve are sequentially sleeved on the upper portion of the side wall of the inner inserting connecting pipe from top to bottom, and the hexagonal internal thread sleeve is arranged on the upper portion of the first sleeve in a threaded mode.

3. The explosion-proof membrane gas meter of claim 1, wherein: the pressure valve changing assembly comprises an upper valve changing component and a lower valve changing component which are matched with each other, the upper valve changing component comprises an air inlet sliding pipe which is inserted in the table-shaped nozzle in a penetrating manner, the lower end of the air inlet sliding pipe is provided with an electromagnetic ring, the air inlet sliding pipe is sleeved with a telescopic spring, and two ends of the telescopic spring are respectively connected with the lower end of the table-shaped nozzle and the upper end of the electromagnetic ring;

4. The explosion-proof card membrane type gas meter according to claim 3, characterized in that: the anti-explosion control device is characterized in that an anti-explosion control assembly is arranged at the upper end of the motor and comprises an anti-explosion circuit board arranged at the upper end of the motor, four anti-explosion TVS diodes are distributed on the upper end of the anti-explosion circuit board in a matrix mode and are connected in series, two positive and negative electrode connectors are installed on two sides of the upper end of the anti-explosion circuit board, and a wireless radio frequency transmitter II is further arranged at the upper end of the anti-explosion circuit board.

5. The explosion-proof card membrane type gas meter according to claim 3, characterized in that: a plurality of the prefabricated gas ports are distributed in an annular array, and the inner diameters of the plurality of the prefabricated gas ports are sequentially arranged from top to bottom.

6. The explosion-proof card membrane type gas meter according to claim 3, characterized in that: the lower end of the driving gear is provided with a lower annular sleeve, the lower annular sleeve is fixedly installed on the inner wall of the first sleeve, and a middle air hole of the lower annular sleeve is matched with the inner diameter of the prefabricated air port.

7. The explosion-proof membrane gas meter of claim 1, wherein: the card display meter comprises a display metering shell, a display screen arranged at the front end of the display metering shell and a magnetic card induction area, wherein the magnetic card induction area is positioned below the display screen, a capacitance induction circuit is arranged in the magnetic card induction area, and a wireless radio frequency receiver and a PLC (programmable logic controller) are arranged in the display metering shell.

8. The explosion-proof card membrane type gas meter according to claim 7, wherein: install first pressure sensor and second pressure sensor on advancing pipe and the gas export respectively of gas, first pressure sensor and second pressure sensor all with PLC controller electric connection.

9. The explosion-proof membrane gas meter of claim 1, wherein: the upper shell, the lower shell and the clamping step are all made of explosion-proof material components.

10. The explosion-proof membrane gas meter of claim 1, wherein: the upper parts of the annular side walls of the first sleeve and the second sleeve are fixedly sleeved with inner fixing plates, and the inner fixing plates are fixedly installed on the inner top wall of the upper shell through screws.