An ultrasonic gas meter field calibration device

Abstract

This invention discloses an ultrasonic gas meter on-site calibration device, relating to the field of gas meter calibration technology. It includes an ultrasonic gas meter, a residential gas meter, a natural gas pipeline, and a gas stove, along with a control unit. The control unit includes a water circulation device, with a constant-temperature heating device at its upper part and a water tank in its middle. This invention establishes an on-site calibration pathway by quickly connecting the natural gas pipeline, residential gas meter, ultrasonic gas meter, and gas stove via a gas delivery hose. Using the residential gas meter as the on-site standard meter, and employing an infrared data interface, it achieves real-time data transmission and automatic comparison. This eliminates the need to disassemble and send the ultrasonic gas meter from the site for testing, directly completing integrated on-site calibration of airtightness and indication error. This completely solves the problems of cumbersome disassembly and time-consuming transportation associated with traditional laboratory calibration methods, significantly improving the efficiency of gas meter calibration.

Description

Technical Field

[0001] This invention relates to the field of gas meter calibration technology, and in particular to an ultrasonic gas meter on-site calibration device. Background Technology

[0002] Residential gas meters are the core measuring instruments for measuring gas consumption, widely used in daily gas consumption scenarios. Their measurement accuracy directly affects the vital interests of both gas suppliers and residential users. Therefore, regular and precise calibration of gas meters is necessary to ensure the accuracy of the measured values. Currently, the traditional calibration method for gas meters in the industry mostly involves disassembling the gas meter to be calibrated from the user site and transporting it to a professional laboratory. The calibration is then carried out using a standard gas flow device provided in the laboratory. By comparing the precise measurement parameters of the standard gas flow device with the reading data of the gas meter to be calibrated, the measurement accuracy of the gas meter is tested and calibrated.

[0003] However, in actual gas meter maintenance, a large number of gas meters are installed in residential buildings. Some gas meters are subject to limitations imposed by the installation environment and pipeline layout, making disassembly cumbersome and prone to causing secondary damage to the gas pipeline. Furthermore, the process of transporting the disassembled meters to the laboratory is time-consuming, affecting residents' normal gas usage. In reality, the need for gas meter calibration is primarily focused on rapid on-site calibration. Traditional laboratory calibration methods are ill-suited to the actual needs of on-site calibration, resulting in low calibration efficiency, poor on-site applicability, and disruption to residents' normal gas usage. Therefore, there is an urgent need for a device that can perform accurate calibration on-site to address the shortcomings of existing calibration methods. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: an ultrasonic gas meter on-site calibration device, comprising an ultrasonic gas meter, a residential meter, a natural gas pipeline, and a gas stove. Both the ultrasonic gas meter and the residential meter have threaded mounting heads on their upper left and right sides. The gas outlet end of the natural gas pipeline is connected to the threaded mounting head on the upper right side of the residential meter via a gas delivery hose. The threaded mounting head on the upper left side of the residential meter is connected to the threaded mounting head on the upper right side of the ultrasonic gas meter via a gas delivery hose. The threaded mounting head on the upper part of the ultrasonic gas meter is connected to the gas inlet end of the gas stove via a gas delivery hose. The control unit includes a water circulation device. A constant temperature heating device is installed at the top of the water circulation device, and a water tank is installed in the middle of the constant temperature heating device. Three water outlets are installed on the left and right sides of the water circulation device, and three water return ports are installed on the front side of the water circulation device. The three water outlets are connected to the front end of the three gas delivery hoses in the gas delivery direction through constant temperature water delivery hoses. The water return ports are connected to the end of the three gas delivery hoses in the gas delivery direction through constant temperature water delivery hoses, for circulating constant temperature water in the gas delivery hoses in the gas delivery direction.

[0005] Preferably, the gas delivery hose includes an outer pipe on the outside and an inner pipe on the inside, with several connectors between the outer pipe and the inner pipe to form a constant temperature water delivery space between the outer pipe and the inner pipe, and a gas delivery space inside the inner pipe.

[0006] Preferably, each of the connecting bodies has a hollow groove in the middle for connecting constant temperature water. Both ends of the gas delivery hose are provided with a first connector for connecting ultrasonic gas meters, residential meters, natural gas pipelines and gas stoves. Both ends of the gas delivery hose are provided with a second connector for connecting constant temperature water delivery hoses.

[0007] Preferably, it also includes a protective housing, the interior of which is provided with protective foam, the protective foam having several fitting grooves, a support plate being provided on the rear side of the protective foam, and clamping units being fixedly connected to the upper left and right sides of the support plate.

[0008] Preferably, the clamping unit includes a fixed seat that is fixedly connected to the upper left and right sides of the support plate by bolts. Rubber clamping seats are slidably provided on the upper left and right sides of the support plate. A threaded push rod is threadedly connected to the middle of the fixed seat. The inner end of the threaded push rod abuts against the outer middle of the rubber clamping seat, which is used to clamp the ultrasonic gas meter after it is placed on the support plate to prevent the ultrasonic gas meter from shaking during the detection process.

[0009] Preferably, the front end of the ultrasonic gas meter is provided with an infrared data interface, which is used to connect to a computer and transmit the data detected by the ultrasonic gas meter to the computer.

[0010] Preferably, the two ends of the constant temperature water delivery hose are respectively sealed and snap-fitted with the water outlet and the second connector and the water return and the second connector, and the first connector of the gas delivery hose is threaded and sealed with the threaded mounting head, the gas outlet end of the natural gas pipeline, and the gas inlet end of the gas stove.

[0011] Preferably, the fitting groove is adapted to the shape of the ultrasonic gas meter, the gas delivery hose and the constant temperature water delivery hose, the support plate is made of rigid non-slip plastic material, the protective foam is made of closed-cell foamed sponge material, and the protective foam is bonded and fixed to the inner wall of the protective box.

[0012] In summary, the present invention provides an ultrasonic gas meter on-site calibration device, which has the following beneficial effects: This invention establishes an on-site calibration pathway by quickly connecting a natural gas pipeline, a residential gas meter, an ultrasonic gas meter, and a gas stove via a gas delivery hose. Using the residential gas meter as the on-site standard, and with the help of an infrared data interface, real-time data transmission and automatic comparison are achieved. There is no need to disassemble and send the ultrasonic gas meter from the site for testing; integrated on-site calibration of airtightness and indication error can be directly completed. This completely solves the problems of cumbersome disassembly and time-consuming transportation associated with traditional laboratory calibration methods, significantly improving the efficiency of gas meter calibration. Furthermore, the modular, quick-connect structure of the device adapts to different residential gas meter installation environments, offering high flexibility for on-site operation and effectively improving the on-site applicability of the calibration device, balancing calibration accuracy and ease of on-site operation. This invention achieves precise temperature control during gas delivery through a collaborative structural design of a control unit, a gas delivery hose, and a constant-temperature water delivery hose. The control unit's water circulation device, in conjunction with a constant-temperature heating device, heats the water in the tank to a set constant temperature, forming a closed-loop water circulation with the constant-temperature water delivery hose via outlet and return water interfaces. The double-layered structure of the gas delivery hose creates independent constant-temperature water delivery and gas delivery spaces. The slots on the connectors ensure uniform flow of constant-temperature water within the pipe, allowing the constant-temperature water to provide full-process temperature control of the gas along the gas delivery direction. This effectively counteracts the effects of low or high ambient temperatures on gas flow rate and density, avoiding calibration errors caused by uneven gas flow rates due to ambient temperature changes. This ensures the calibration process remains under stable temperature conditions, significantly improving the measurement accuracy of ultrasonic gas meter on-site calibration. This invention achieves comprehensive protection and convenient transportation of ultrasonic gas meters through the matching structure of the protective housing and clamping unit. The protective foam inside the housing has fitting grooves that conform to the shape of the ultrasonic gas meter, providing cushioning protection and preventing damage from bumps and vibrations during transportation. The clamping unit on the support plate pushes the rubber clamping seat with a threaded push rod, achieving flexible and stable clamping and fixing of the ultrasonic gas meter. This ensures the stability of the meter during on-site calibration and also fixes the meter in the housing during transportation, improving the overall portability of the device and facilitating the safe transportation of ultrasonic gas meters to various on-site calibration scenarios. At the same time, the control unit is an integrated structure, with the water circulation device, constant temperature heating device, and water tank integrated vertically. The water outlet and return water interface are centrally located on the outside of the device, allowing for quick connection with the constant temperature water delivery hose without complicated assembly and debugging, greatly reducing the difficulty of on-site installation and operation and improving the ease of operation of the device. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of an ultrasonic gas meter field calibration device according to the present invention; Figure 2 This is a top view schematic diagram of the ultrasonic gas meter field calibration device of the present invention; Figure 3 This is a schematic diagram of the gas delivery hose structure of an ultrasonic gas meter field calibration device according to the present invention; Figure 4 This is a cross-sectional view of the gas delivery hose of an ultrasonic gas meter field calibration device according to the present invention. Figure 5 This is a schematic diagram of the cross-sectional structure of the gas delivery hose of the ultrasonic gas meter field calibration device of the present invention; Figure 6 This is a schematic diagram of the ultrasonic gas meter and residential meter structure of the ultrasonic gas meter field calibration device of the present invention; Figure 7 This is a schematic diagram of the control unit structure of an ultrasonic gas meter field calibration device according to the present invention; Figure 8 This is a schematic diagram of the protective housing and clamping unit structure of an ultrasonic gas meter field calibration device according to the present invention; Figure 9 This is an enlarged schematic diagram of point A of the ultrasonic gas meter field calibration device of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. Ultrasonic gas meter; 2. Residential meter; 3. Natural gas pipeline; 4. Gas stove; 5. Control unit; 501. Water circulation device; 502. Constant temperature heating device; 503. Water tank; 504. Water outlet; 505. Water return interface; 6. Gas delivery hose; 601. Outer pipe; 602. Inner pipe; 603. Connector; 604. Constant temperature water delivery space; 605. Gas delivery space; 606. Empty slot; 607. First connector; 608. Second connector; 7. Constant temperature water delivery hose; 8. Protective housing; 801. Protective foam; 802. Fitting groove; 803. Support plate; 9. Clamping unit; 901. Fixing seat; 902. Threaded push rod; 903. Rubber clamping seat; 10. Infrared data interface; 11. Threaded mounting head. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 This application will be described in further detail below. Example

[0016] Please see Figures 1-9 As shown, the present invention provides a technical solution: an ultrasonic gas meter on-site calibration device, including an ultrasonic gas meter 1, a residential meter 2, a natural gas pipeline 3, and a gas stove 4. The device is characterized in that: threaded mounting heads 11 are provided on the upper left and right sides of both the ultrasonic gas meter 1 and the residential meter 2; the gas outlet end of the natural gas pipeline 3 is connected to the threaded mounting head 11 on the upper right side of the residential meter 2 via a gas delivery hose 6; the threaded mounting head 11 on the upper left side of the residential meter 2 is connected to the threaded mounting head 11 on the upper right side of the ultrasonic gas meter 1 via the gas delivery hose 6; and the threaded mounting head 11 on the upper part of the ultrasonic gas meter 1 is connected to the gas inlet end of the gas stove 4 via the gas delivery hose 6. The threaded mounting heads 11 enable rapid docking and sealed connection between the natural gas pipeline 3, the residential meter 2, the ultrasonic gas meter 1, and the gas stove 4, establishing a standardized gas delivery calibration path. Simultaneously, the unified connection structure improves on-site assembly efficiency and adapts to the on-site calibration requirements of different scenarios. The control unit 5 includes a water circulation device 501. A constant temperature heating device 502 is located at the top of the water circulation device 501, and a water tank 503 is located in the middle of the constant temperature heating device 502. Three water outlets 504 are located on the left and right sides of the water circulation device 501, and three water return ports 505 are located at the front of the water circulation device 501. The three water outlets 504 are connected to the front end of the three gas delivery hoses 6 via constant temperature water delivery hoses 7, and the water return ports 505 are connected to the end of the three gas delivery hoses 6 via constant temperature water delivery hoses 7. This system circulates constant temperature water within the gas delivery hoses 6 according to the gas delivery direction. The constant temperature heating device 502 heats the water in the water tank 503 to a set constant temperature, and the water circulation device 501 achieves directional circulation of constant temperature water within the gas delivery hoses 6. This provides constant temperature control for the gas during the gas delivery process, preventing ambient temperature changes from affecting the gas metering accuracy, providing a stable temperature environment for calibration and testing, and improving the accuracy of calibration data.

[0017] The gas delivery hose 6 includes an outer pipe 601 on the outside and an inner pipe 602 on the inside. Several connectors 603 are provided between the outer pipe 601 and the inner pipe 602, forming a constant temperature water delivery space 604 between the outer pipe 601 and the inner pipe 602. A gas delivery space 605 is formed inside the inner pipe 602. Through the double-layer structure design of the outer pipe 601 and the inner pipe 602, the space for gas delivery and constant temperature water circulation is separated. This ensures the normal flow of gas in the gas delivery space 605 and allows for uniform temperature control of the gas in the pipe through the constant temperature water flow in the constant temperature water delivery space 604. At the same time, the connectors 603 can enhance the structural strength of the hose and prevent the hose from deforming due to pressure, thus affecting the delivery and temperature control effect.

[0018] Each connector 603 has a slot 606 in the middle for connecting the constant temperature water. The slot 606 can realize the interconnection of water in each constant temperature water delivery space 604, ensuring the smooth circulation of constant temperature water in the gas delivery hose 6, keeping the water temperature in each position in the hose uniform, avoiding gas metering deviation caused by local temperature difference, and further improving the effect of constant temperature control. Both ends of the gas delivery hose 6 are equipped with first connectors 607 for connecting the ultrasonic gas meter 1, residential meter 2, natural gas pipeline 3, and gas stove 4. Both ends of the gas delivery hose 6 are equipped with second connectors 608 for connecting the constant temperature water delivery hose 7. The first connectors 607 enable precise docking of the gas delivery hose 6 with various equipment and instruments, ensuring the sealing of gas delivery. The second connectors 608 enable quick and sealed connection between the constant temperature water delivery hose 7 and the gas delivery hose 6. The two types of connectors have clear functions, which not only improves the convenience of pipeline connection but also effectively prevents gas leakage and constant temperature water leakage, ensuring the safety and stability of calibration operations.

[0019] It also includes a protective housing 8, inside which is a protective foam 801. The protective foam 801 has several fitting slots 802. A support plate 803 is provided on the rear side of the protective foam 801. Clamping units 9 are fixedly connected to the upper left and right sides of the support plate 803. The protective housing 8 can provide overall protection for the ultrasonic gas meter 1 and related calibration accessories, preventing bumps and impacts during on-site operations. The fitting slots 802 of the protective foam 801 can neatly store the accessories. The support plate 803, together with the clamping units 9, can provide a stable foundation for the ultrasonic gas meter 1, avoiding displacement of the instrument during calibration and ensuring the smooth progress of the testing work.

[0020] The clamping unit 9 includes a fixed seat 901 that is bolted to the left and right sides of the upper part of the support plate 803. Rubber clamping seats 903 are slidably provided on the left and right sides of the upper part of the support plate 803. A threaded push rod 902 is threadedly connected to the middle of the fixed seat 901. The inner end of the threaded push rod 902 abuts against the outer middle of the rubber clamping seat 903. It is used to clamp the ultrasonic gas meter 1 after it is placed on the support plate 803 to prevent the ultrasonic gas meter 1 from shaking during the test. The rubber clamping seat 903 can be pushed by turning the threaded push rod 902 to achieve flexible clamping and fixing of the ultrasonic gas meter 1. It can be adapted to ultrasonic gas meters 1 of different specifications. It has strong clamping stability and can effectively prevent the connection from loosening and data acquisition deviation caused by instrument shaking and displacement during calibration and testing. At the same time, the rubber material can avoid scratching damage to the instrument surface during clamping.

[0021] The front end of the ultrasonic gas meter 1 is equipped with an infrared data interface 10, which is used to connect to a computer to transmit the data detected by the ultrasonic gas meter 1 to the computer. The infrared data interface 10 enables rapid data transmission between the ultrasonic gas meter 1 and the computer, synchronizing real-time calibration test data to the computer, which facilitates staff to view, record and analyze the data in real time. At the same time, it enables electronic storage of test data, which provides convenience for subsequent calibration report generation and data traceability, and improves the digital efficiency of calibration operations.

[0022] The two ends of the constant temperature water delivery hose 7 are respectively connected to the water outlet 504 and the second connector 608 and the return water interface 505 and the second connector 608 in a sealed snap-fit ​​manner. The first connector 607 of the gas delivery hose 6 is connected to the threaded installation head 11, the gas outlet end of the natural gas pipeline 3, and the gas inlet end of the gas stove 4 in a threaded sealed connection. The sealed snap-fit ​​mechanism can ensure the sealing of the connection between the constant temperature water delivery hose 7 and each interface and prevent the constant temperature water from leaking. The threaded sealing connection can further improve the sealing performance of the gas delivery pipeline and effectively avoid gas leakage. The combination of the two types of sealing connection structures can not only ensure the stability of constant temperature water circulation and gas delivery, but also improve the safety of on-site operations. At the same time, the combination of snap-fit ​​and threaded connection takes into account both the convenience of connection and sealing performance.

[0023] The fitting groove 802 is adapted to the shape of the ultrasonic gas meter 1, the gas delivery hose 6, and the constant temperature water delivery hose 7. The support plate 803 is made of hard, non-slip plastic, and the protective foam 801 is made of closed-cell foam sponge. The protective foam 801 is bonded to the inner wall of the protective box 8. The matching fitting groove 802 can accurately position and store the ultrasonic gas meter 1, the gas delivery hose 6, and the constant temperature water delivery hose 7, preventing the accessories from shaking or colliding and causing damage inside the box. The support plate 803 made of hard, non-slip plastic can improve the stability of the instrument placement. The protective foam 801 made of closed-cell foam sponge has a good cushioning and protection effect, and the way it is bonded to the protective box 8 can ensure the integrity of the protective structure, improving the portability and protection of the device.

[0024] Please see Figures 1-9 As shown, the implementation principle of this application embodiment is as follows: natural gas pipeline 3 is connected to residential gas meter 2, residential gas meter 2 and ultrasonic gas meter 1 are connected in series through gas delivery hose 6, ultrasonic gas meter 1 is then connected to gas stove 4 through gas delivery hose 6, and an infrared data interface 10 is attached to ultrasonic gas meter 1. The other end of the infrared data interface 10 is connected to a computer to realize the real-time transmission of calibration data. Before the calibration operation, ultrasonic gas meter 1 is placed on support plate 803 inside protective box 8, and the threaded push rod 902 of clamping unit 9 is turned to push rubber clamping seat 90 3. The ultrasonic gas meter 1 is clamped and fixed to prevent the meter body from shaking during the calibration process. At the same time, the control unit 5 starts working. The water circulation device 501, together with the constant temperature heating device 502, heats the water in the water tank 503 to the set constant temperature. The water is then transported to the constant temperature water transport space 604 of the gas transport hose 7 through the water outlet 504. The constant temperature water circulates in the gas transport hose 6 along the gas transport direction and finally flows back to the control unit 5 through the return water interface 505. This achieves constant temperature control during the gas transport process and avoids temperature changes from affecting the accuracy of the meter calibration. When formally conducting calibration, first open the gas supply valve of natural gas pipeline 3, and manually inspect the ultrasonic gas meter 1 visually. After natural gas fills the natural gas pipeline 3, residential meter 2, ultrasonic gas meter 1, and all gas delivery hoses 6, close the valve on ultrasonic gas meter 1 to create a sealed and pressure-maintaining passage between the valve and the valve on the side of natural gas pipeline 3. Magnetically attach the pressure sensor to the surface of ultrasonic gas meter 1, and monitor the pressure changes in the pressure-maintaining space in real time through the pressure sensor. Transmit the pressure data to the control system and computer, observe the pressure value changes, and determine whether there are any gas leaks in ultrasonic gas meter 1 and its connection parts. After the airtightness test is qualified, open the valve on ultrasonic gas meter 1, ignite the gas stove 4, and adjust the gas delivery flow by adjusting the flame switch of gas stove 4 in conjunction with the ball valve on ultrasonic gas meter 1. The control system collects the flow display value of ultrasonic gas meter 1 in real time through infrared data interface 10, and simultaneously collects the standard flow value of residential meter 2 to achieve automatic comparison of the flow data of the two meters and determine whether the flow value meets the calibration standard. After adjusting the gas stove 4 to its maximum power, the maximum gas flow rate is precisely controlled by the ball valve on the ultrasonic gas meter 1. The flow data of both meters are continuously collected and automatically compared. The indication error of the ultrasonic gas meter 1 under the maximum flow condition is detected. After completing the multi-level flow calibration, the valve on the gas stove 4 is closed. The control system retrieves the starting and ending values ​​of the residential gas meter 2 and the ultrasonic gas meter 1 during the calibration process, automatically calculates the difference between the two values, and corrects the difference by combining the ambient temperature data collected by the temperature measuring device. Finally, the cumulative flow indication error of the ultrasonic gas meter 1 is obtained, and the overall calibration operation is completed. All calibration data is transmitted to the computer for storage and analysis through the infrared data interface 10, which facilitates subsequent data traceability and calibration report generation.

[0025] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultrasonic gas meter field calibration device, comprising an ultrasonic gas meter (1), a residential meter (2), a natural gas pipeline (3), and a gas stove (4), characterized in that: Both the ultrasonic gas meter (1) and the residential gas meter (2) are provided with threaded mounting heads (11) on the upper left and right sides. The gas outlet end of the natural gas pipeline (3) is connected to the threaded mounting head (11) on the upper right side of the residential gas meter (2) through a gas delivery hose (6). The threaded mounting head (11) on the upper left side of the residential gas meter (2) is connected to the threaded mounting head (11) on the upper right side of the ultrasonic gas meter (1) through a gas delivery hose (6). The threaded mounting head (11) on the upper part of the ultrasonic gas meter (1) is connected to the gas inlet end of the gas stove (4) through a gas delivery hose (6). The control unit (5) includes a water circulation device (501), a constant temperature heating device (502) is provided on the upper part of the water circulation device (501), a water tank (503) is provided in the middle of the constant temperature heating device (502), three water outlets (504) are provided on the left and right sides of the water circulation device (501), and three water return ports (505) are provided on the front side of the water circulation device (501). The three water outlets (504) are all connected to the front end of the gas delivery flow of the three gas delivery hoses (6) through a constant temperature water delivery hose (7), and the water return ports (505) are connected to the end of the gas delivery flow of the three gas delivery hoses (6) through a constant temperature water delivery hose (7), for circulating constant temperature water in the gas delivery hoses (6) in the direction of gas delivery.

2. The ultrasonic gas meter field calibration device according to claim 1, characterized in that: The gas delivery hose (6) includes an outer tube (601) on the outside and an inner tube (602) on the inside. Several connectors (603) are provided between the outer tube (601) and the inner tube (602) to form a constant temperature water delivery space (604) between the outer tube (601) and the inner tube (602), and a gas delivery space (605) is formed inside the inner tube (602).

3. The ultrasonic gas meter field calibration device according to claim 2, characterized in that: Each of the connectors (603) has a hollow groove (606) in the middle for connecting constant temperature water bodies; Both ends of the gas delivery hose (6) are provided with a first connector (607) for connecting the ultrasonic gas meter (1), the residential meter (2), the natural gas pipeline (3) and the gas stove (4). Both ends of the gas delivery hose (6) are provided with a second connector (608) for connecting the constant temperature water delivery hose (7).

4. The ultrasonic gas meter field calibration device according to claim 1, characterized in that: It also includes a protective box (8), inside which a protective foam (801) is provided, and a number of fitting grooves (802) are provided on the protective foam (801). A support plate (803) is provided on the rear side of the protective foam (801), and clamping units (9) are fixedly connected to the upper left and right sides of the support plate (803).

5. The ultrasonic gas meter field calibration device according to claim 4, characterized in that: The clamping unit (9) includes a fixed seat (901) fixedly connected to the upper left and right sides of the support plate (803) by bolts. Rubber clamping seats (903) are slidably provided on the upper left and right sides of the support plate (803). A threaded push rod (902) is threadedly connected to the middle of the fixed seat (901). The inner end of the threaded push rod (902) abuts against the outer middle of the rubber clamping seat (903) to clamp the ultrasonic gas meter (1) after it is placed on the support plate (803) to prevent the ultrasonic gas meter (1) from shaking during the detection process.

6. The ultrasonic gas meter field calibration device according to claim 1, characterized in that: The front end of the ultrasonic gas meter (1) is provided with an infrared data interface (10), which is used to connect to a computer and transmit the data detected by the ultrasonic gas meter (1) to the computer.

7. The ultrasonic gas meter field calibration device according to claim 4, characterized in that: The two ends of the constant temperature water delivery hose (7) are respectively sealed and snap-fitted with the water outlet (504), the second connector (608) and the return water interface (505), the second connector (608). The first connector (607) of the gas delivery hose (6) is threaded and sealed with the threaded mounting head (11), the gas outlet end of the natural gas pipeline (3) and the gas inlet end of the gas stove (4).

8. The ultrasonic gas meter field calibration device according to claim 4, characterized in that: The fitting groove (802) is adapted to the shape of the ultrasonic gas meter (1), the gas delivery hose (6) and the constant temperature water delivery hose (7). The support plate (803) is made of hard, non-slip plastic material. The protective foam (801) is made of closed-cell foam sponge material, and the protective foam (801) is bonded to the inner wall of the protective box (8).

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