Metering module shared by G4 and G6 ultrasonic gas meters

Abstract

The utility model discloses a metering module shared by a G4 ultrasonic gas meter and a G6 ultrasonic gas meter, relates to the technical field of gas metering, and solves the technical problem that an existing metering module cannot meet the use requirements of the G4 ultrasonic gas meter and the G6 ultrasonic gas meter. The device comprises a measuring pipe section, an energy converter and a fixing structure, the energy converter is fixed on the measuring pipe section, and the energy converter is a correlation type energy converter; the fixing structure is detachably connected to the gas outlet of the measuring pipe section, and the metering module is fixedly connected with an adapter of a G4 ultrasonic gas meter through the fixing structure, or the metering module is fixedly connected with an adapter of a G6 ultrasonic gas meter through the fixing structure. According to the utility model, the metering module can be fixed on the G4 ultrasonic gas meter or the G6 ultrasonic gas meter by replacing the fixing structure on the measuring pipe section, so that the use scene of the metering module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas metering, in particular to a metering module shared by G4 and G6 ultrasonic gas meters. Background Art

[0002] An ultrasonic gas meter is a new type of gas meter that uses modern microelectronics technology, modern sensing technology, and intelligent IC card technology to measure the gas consumption, and perform data remote transmission and settlement transactions. After years of development, it has gradually become stable.

[0003] The ultrasonic gas meter includes a G4 ultrasonic gas meter and a G6 ultrasonic gas meter. At present, the joint specifications of the G4 ultrasonic gas meter and the G6 ultrasonic gas meter on the market are inconsistent. Therefore, metering modules with corresponding joint sizes and flow channels with different cross-sectional areas need to be used separately. The structural schematic diagram of the existing metering module is as Figure 2 shown. The flow channel includes a flow channel upper shell 1' and a flow channel lower shell 2'. The structure of the ultrasonic probe 3' on the flow channel is a V-shaped reflection structure. The flow dividing plate 4' is installed in the flow channel, and the air outlet of the flow channel is usually only adapted to the G4 ultrasonic gas meter or the G6 ultrasonic gas meter. The metering module cannot be applied to both the G4 ultrasonic gas meter and the G6 ultrasonic gas meter at the same time. The use scenario is single, the use range is small, and it cannot well meet the use requirements.

[0004] In the process of implementing the present utility model, the applicant found that there are at least the following problems in the prior art:

[0005] The existing metering module cannot meet the use requirements of both the G4 ultrasonic gas meter and the G6 ultrasonic gas meter. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a metering module shared by G4 and G6 ultrasonic gas meters to solve the technical problem that the existing metering module in the prior art cannot meet the use requirements of both the G4 ultrasonic gas meter and the G6 ultrasonic gas meter. The many technical effects that can be produced by the preferred technical solutions provided by the present utility model are described in detail below.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A metering module shared by G4 and G6 ultrasonic gas meters provided by the utility model includes a measuring pipe section, a transducer and a fixing structure. The transducer is fixed on the measuring pipe section, and the transducer is an opposed transducer. The fixing structure is detachably connected to the air outlet of the measuring pipe section. The metering module is fixedly connected to the adapter of the G4 ultrasonic gas meter through the fixing structure, or the metering module is fixedly connected to the adapter of the G6 ultrasonic gas meter through the fixing structure.

[0009] Optionally, the fixing structure is a G4 fixing joint or a G6 fixing joint. A plurality of mounting holes are provided on both the G4 fixing joint and the G6 fixing joint, and the mounting holes are correspondingly arranged one by one with a plurality of fixing holes on the air outlet. The G4 fixing joint or the G6 fixing joint is fixed on the air outlet through the cooperation of the mounting holes, the fixing holes and the connecting piece.

[0010] Optionally, the first end of the G4 fixing joint corresponds to the air outlet, the second end of the G4 fixing joint corresponds to the adapter of the G4 ultrasonic gas meter, and the inner diameter of the first end of the G4 fixing joint is larger than the inner diameter of the second end of the G4 fixing joint.

[0011] The first end of the G6 fixing joint corresponds to the air outlet, the second end of the G6 fixing joint corresponds to the adapter of the G6 ultrasonic gas meter, and the inner diameter of the first end of the G6 fixing joint is smaller than the inner diameter of the second end of the G6 fixing joint.

[0012] Optionally, it further includes a flow guide cover, and the flow guide cover is fixed on the air inlet of the measuring pipe section.

[0013] Optionally, a plurality of limiting blocks are arranged on the side surface of the flow guide cover, a plurality of limiting grooves are provided on the air inlet, and the plurality of limiting blocks are correspondingly arranged one by one with the plurality of limiting grooves and are mutually matched. The outer side surface of the limiting block is arranged at an acute angle with the side surface of the flow guide cover. The flow guide cover is clamped and fixed on the air inlet through the cooperation of the limiting block and the limiting groove.

[0014] Optionally, the structure of the flow guide cover is a grid structure arranged in an array, and a reinforcing rib is provided in the middle of the flow guide cover.

[0015] Optionally, the transducer includes an upstream ultrasonic probe and a downstream ultrasonic probe. The upstream ultrasonic probe is adjacent to the air inlet of the measuring pipe section, the downstream ultrasonic probe is adjacent to the air outlet of the measuring pipe section, and the upstream ultrasonic probe and the downstream ultrasonic probe are symmetrically arranged on both sides of the measuring pipe section.

[0016] Optionally, the structure of the measuring pipe section is an integral structure.

[0017] Optionally, the cross-section of the air inlet of the measurement pipe section is circular, and the cross-section of the metering section of the measurement pipe section is rectangular.

[0018] Optionally, it further includes a metering circuit board and a mounting groove. The mounting groove is fixed on the side of the measurement pipe section; the metering circuit board is fixed in the mounting groove, and the metering circuit board is electrically connected to the transducer.

[0019] Implementing one of the above technical solutions of the present utility model has the following advantages or beneficial effects:

[0020] By replacing the fixing structure on the measurement pipe section, the metering module of the present utility model can be fixed to a G4 ultrasonic gas meter or a G6 ultrasonic gas meter, improving the usage scenarios of the metering module. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings. In the drawings:

[0022] Figure 1 is the perspective view of the embodiment of the present utility model;

[0023] Figure 2 is the structural schematic diagram of the existing metering module;

[0024] Figure 3 is the cross-sectional view of the embodiment of the present utility model;

[0025] Figure 4 is the first exploded view of the embodiment of the present utility model;

[0026] Figure 5 is the second exploded view of the embodiment of the present utility model;

[0027] Figure 6 is the schematic diagram of the G4 fixed joint of the embodiment of the present utility model;

[0028] Figure 7 is the schematic diagram of the G6 fixed joint of the embodiment of the present utility model.

[0029] In the figure: 1. Measuring pipe section; 11. Fixed hole; 12. Limit groove; 13. Protrusion; 2. Transducer; 21. Upstream ultrasonic probe; 22. Downstream ultrasonic probe; 23. First probe pressing plate; 24. Second probe pressing plate; 25. Through hole; 26. Connecting ear; 3. Fixing structure; 31. G4 fixing joint; 32. G6 fixing joint; 33. Mounting hole; 4. Flow guide cover; 41. Limit block; 42. Reinforcing rib; 5. Metering circuit board; 6. Mounting groove. Detailed implementation mode

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, various exemplary embodiments to be described below will refer to the corresponding drawings, which form a part of the exemplary embodiments and describe various exemplary embodiments that may be adopted to implement the present utility model. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation modes described in the following exemplary embodiments do not represent all implementation modes consistent with the present disclosure. It should be understood that they are only examples of processes, methods, devices, etc. that are consistent with some aspects of the present utility model disclosed in detail in the appended claims. Other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present utility model.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", etc. indicate the orientation or positional relationship based on the orientation shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. The meaning of the term "multiple" is two or more. The terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. The term " / and" includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In order to illustrate the technical solutions described in the present utility model, the following will be described through specific embodiments, and only the parts related to the embodiments of the present utility model are shown.

[0033] Embodiment 1:

[0034] As Figure 1 AndFigure 3 As shown, the utility model provides a metering module shared by G4 and G6 ultrasonic gas meters, which includes a measuring pipe section 1, a transducer 2 and a fixing structure 3. The transducer 2 is fixed on the measuring pipe section 1, and the transducer 2 is a transmissive transducer. The fixing structure 3 is detachably connected to the gas outlet of the measuring pipe section 1. The metering module is fixedly connected to the adapter of the G4 ultrasonic gas meter through the fixing structure 3, or the metering module is fixedly connected to the adapter of the G6 ultrasonic gas meter through the fixing structure 3. Specifically, the fixing structure 3 is detachably connected to the gas outlet of the measuring pipe section 1, and the fixing structure 3 on the measuring pipe section 1 can be replaced according to whether the ultrasonic gas meter is a G4 ultrasonic gas meter or a G6 ultrasonic gas meter, so as to meet the requirement that the metering module can be used on both the G4 ultrasonic gas meter and the G6 ultrasonic gas meter, and increase the usage demand of the metering module. Gas enters the measuring pipe section 1 from the inlet direction of the measuring pipe section 1 through a flow guide cover 4 (described below), and flows out from the gas outlet of the measuring pipe section 1. When the ultrasonic wave emitted by the transducer 2 on the measuring pipe section 1 can pass through the gas, the gas flow information in the measuring pipe section 1 can be measured according to the signal received by the transducer 2, and the metering of the gas consumption is completed.

[0035] The utility model improves the usage scenario of the metering module by replacing the fixing structure 3 on the measuring pipe section 1, so that the metering module can be fixed to the G4 ultrasonic gas meter or the G6 ultrasonic gas meter.

[0036] As an optional implementation manner, as Figure 4As shown, the fixing structure 3 is a G4 fixing joint 31 or a G6 fixing joint 32. A plurality of mounting holes 33 are provided on both the G4 fixing joint 31 and the G6 fixing joint 32, and the mounting holes 33 correspond one by one to the plurality of fixing holes 11 on the air outlet. The G4 fixing joint 31 or the G6 fixing joint 32 is fixedly installed on the air outlet in cooperation with the connecting member through the mounting holes 33 and the fixing holes 11. Specifically, the metering module can replace the fixing structure 3 on the metering module according to the requirements of the ultrasonic gas meter, thereby increasing the usage scenarios of the metering module and improving the applicable range of the metering module. When the ultrasonic gas meter is a G4 ultrasonic gas meter, the fixing structure 3 installed on the metering module is the G4 fixing joint 31, ensuring that the metering module can be adapted to the G4 ultrasonic gas meter and can be installed on the G4 ultrasonic gas meter. When the ultrasonic gas meter is a G6 ultrasonic gas meter, the fixing structure 3 installed on the metering module is the G6 fixing joint 32, ensuring that the metering module can be adapted to the G6 ultrasonic gas meter and can be installed on the G6 ultrasonic gas meter. By replacing the fixing structure 3 on the measuring pipe section 1, the utilization rate of the measuring pipe section 1 can be improved. A plurality of pipe section holes are provided on the air outlet of the measuring pipe section 1. The fixing holes 11 correspond to and match the mounting holes 33 on the fixing structure 3. The fixing structure 3 is fixedly installed on the air outlet of the measuring pipe section 1 by a connecting member (such as a screw, a bolt, etc.) passing through the mounting holes 33 and the fixing holes 11 in sequence.

[0037] As an alternative embodiment, as Figure 6 and Figure 7 shown, the first end of the G4 fixing joint 31 corresponds to the air outlet, the second end of the G4 fixing joint 31 corresponds to the adapter of the G4 ultrasonic gas meter, and the inner diameter of the first end of the G4 fixing joint 31 is larger than the inner diameter of the second end of the G4 fixing joint 31. The first end of the G6 fixing joint 32 corresponds to the air outlet, the second end of the G6 fixing joint 32 corresponds to the adapter of the G6 ultrasonic gas meter, and the inner diameter of the first end of the G6 fixing joint 32 is smaller than the inner diameter of the second end of the G6 fixing joint 32. Specifically, the inner diameter of the first end of the G4 fixing joint 31 being larger than the inner diameter of the second end of the G4 fixing joint 31 can reduce the flow rate of the gas flowing out of the air outlet of the measuring pipe section 1 and transition to the G4 ultrasonic gas meter to meet the flow rate section of the G4 ultrasonic gas meter. The inner diameter of the first end of the G6 fixing joint 32 being smaller than the inner diameter of the second end of the G6 fixing joint 32 can increase the flow rate of the gas flowing out of the air outlet of the measuring pipe section 1 and transition to the G6 ultrasonic gas meter to meet the flow rate section of the G6 ultrasonic gas meter.

[0038] As an alternative embodiment, as Figure 5As shown in the figure, it further includes a fairing 4, and the fairing 4 is fixed on the air inlet of the measuring pipe section 1. Specifically, the fairing 4 fixed on the air inlet of the measuring pipe section 1 can make the gas entering the air inlet of the measuring pipe section 1 have a stable air flow, ensuring the stability of the gas inside the measuring pipe section 1.

[0039] As an alternative embodiment, as Figure 5 shown in the figure, a plurality of limit blocks 41 are arranged on the side surface of the fairing 4, and a plurality of limit grooves 12 are provided on the air inlet. The plurality of limit blocks 41 and the plurality of limit grooves 12 are arranged in one-to-one correspondence and match with each other. The outer side surface of the limit block 41 is arranged at an acute angle with the side surface of the fairing 4. The fairing 4 is clamped and fixed on the air inlet through the cooperation of the limit blocks 41 and the limit grooves 12. Specifically, the material of the limit block 41 is an elastic material. When the fairing 4 is inserted into the air inlet, the plurality of limit blocks 41 on the fairing 4 are aligned with the plurality of limit grooves 12 on the air inlet one by one, and the outer side surface of the limit block 41 is compressed and deformed. When the limit block 41 reaches the bottom of the limit groove 12, the outer side surface of the limit block 41 resumes deformation, and the limit groove 12 limits and fixes the limit block 41, realizing the clamping connection of the fairing 4 to the air inlet of the measuring pipe section 1.

[0040] As an alternative embodiment, as Figure 5 shown in the figure, the structure of the fairing 4 is a grid structure arranged in an array, and a reinforcing rib 42 is provided in the middle of the fairing 4. Specifically, the fairing 4 with a grid structure arranged in an array can ensure that the gas is in a relatively stable state, i.e., a laminar flow state, after entering the measuring pipe section 1. Since the air flow in the middle of the fairing 4 is relatively strong, a reinforcing rib 42 is provided in the middle of the fairing 4, which can strengthen the overall stability of the fairing 4, and the grid structure is not easily broken, improving the service life of the fairing 4. The reinforcing rib 42 is a circular structure and is integrally formed with the grid structure.

[0041] As an alternative embodiment, as Figure 3 and Figure 5As shown, the transducer 2 includes an upstream ultrasonic probe 21 and a downstream ultrasonic probe 22. The upstream ultrasonic probe 21 is adjacent to the air inlet of the measuring pipe section 1, and the downstream ultrasonic probe 22 is adjacent to the air outlet of the measuring pipe section 1. The upstream ultrasonic probe 21 and the downstream ultrasonic probe 22 are symmetrically arranged on both sides of the measuring pipe section 1. Specifically, the measuring pipe section 1 is provided with a first installation position for installing the upstream ultrasonic probe 21 and a second installation position for installing the downstream ultrasonic probe 22. The upstream ultrasonic probe 21 and the downstream ultrasonic probe 22 are respectively installed in the corresponding installation positions. The transducer 2 further includes a first probe pressing plate 23 and a second probe pressing plate 24. The first probe pressing plate 23 is arranged on the upstream ultrasonic probe 21 for fixing the upstream ultrasonic probe 21. The lead wire on the upstream ultrasonic probe 21 passes through the through hole 25 of the first probe pressing plate 23 and is exposed outside the first installation position. The symmetrically arranged connecting ears 26 on the first probe pressing plate 23 cooperate with the corresponding protrusions 13 on the first installation position to snap and fix the first probe pressing plate 23 on the first installation position, so as to press and fix the upstream ultrasonic probe 21 in the first installation position. The second probe pressing plate 24 is arranged on the downstream ultrasonic probe 22 for fixing the downstream ultrasonic probe 22. The lead wire on the downstream ultrasonic probe 22 passes through the through hole 25 of the second probe pressing plate 24 and is exposed outside the second installation position. The symmetrically arranged connecting ears 26 on the second probe pressing plate 24 cooperate with the corresponding protrusions 13 on the second installation position to snap and fix the second probe pressing plate 24 on the second installation position, so as to press and fix the downstream ultrasonic probe 22 in the second installation position. The upstream ultrasonic probe 21 and the downstream ultrasonic probe 22 are symmetrically arranged on both sides of the measuring pipe section 1. The ultrasonic wave emitted by the upstream ultrasonic probe 21 can be directly emitted to the downstream ultrasonic probe 22 and received by the downstream ultrasonic probe 22. The ultrasonic wave emitted by the downstream ultrasonic probe 22 can be directly emitted to the upstream ultrasonic probe 21 and received by the upstream ultrasonic probe 21.

[0042] As an optional implementation manner, as Figure 1 shown, the structure of the measuring pipe section 1 is an integral structure. Specifically, the structure of the measuring pipe section 1 is an integral structure, which combines the existing flow channel upper shell and the flow channel lower shell into one. Only one set of molds is required during production and processing, and the production process is simple, which is conducive to improving production efficiency. At the same time, the integral structure of the measuring pipe section 1 does not require assembly, can reduce components, lower production costs, and can also reduce production processes and improve production efficiency.

[0043] As an optional implementation manner, as Figure 5As shown, the cross-section of the air inlet of the measuring pipe section 1 is circular, and the cross-section of the metering section of the measuring pipe section 1 is rectangular. Specifically, the cross-section of the air inlet of the measuring pipe section 1 is circular, which is convenient for fixed connection with the fairing 4 and the air pipe. The cross-section of the measuring pipe section 1 can be adaptively set to different shapes according to actual needs, as long as it can play a role in rectifying the flow.

[0044] As an alternative embodiment, as Figure 4 shown, it further includes a metering circuit board 5 and a mounting groove 6, and the mounting groove 6 is fixed on the side of the measuring pipe section 1. The metering circuit board 5 is fixed in the mounting groove 6, and the metering circuit board 5 is electrically connected to the transducer 2. Specifically, the mounting groove 6 and the measuring pipe section 1 are integrally formed, which is convenient for production and processing, can reduce the number of components, and lower the production cost. The metering circuit board 5 and the mounting groove 6 are mutually matched, and the metering circuit board 5 is fixed in the mounting groove 6. The metering circuit board 5 can obtain the signal of the transducer 2, and measure the relevant information of the flow rate of the measuring pipe section 1 through the signal of the transducer 2, such as cumulative usage, instantaneous flow rate, flight time, abnormal flow rate judgment, etc.

[0045] The embodiment is only a special case and does not indicate that the present utility model has only such an implementation manner.

[0046] The above are only the preferred embodiments of the present utility model. Those skilled in the art know that without departing from the spirit and scope of the present utility model, these features and embodiments can be variously changed or equivalently replaced. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present utility model.

Claims

1. A metering module shared by G4 and G6 ultrasonic gas meters, characterized in that, It includes a measuring pipe section (1), a transducer (2) and a fixing structure (3). The transducer (2) is fixed on the measuring pipe section (1), and the transducer (2) is an opposed transducer; the fixing structure (3) is detachably connected to the air outlet of the measuring pipe section (1), and the metering module is fixedly connected to the adapter of the G4 ultrasonic gas meter through the fixing structure (3), or the metering module is fixedly connected to the adapter of the G6 ultrasonic gas meter through the fixing structure (3).

2. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 1, characterized in that, The fixing structure (3) is a G4 fixing joint (31) or a G6 fixing joint (32). A plurality of mounting holes (33) are provided on both the G4 fixing joint (31) and the G6 fixing joint (32), and the mounting holes (33) correspond to a plurality of fixing holes (11) on the air outlet one by one; the G4 fixing joint (31) or the G6 fixing joint (32) is fixed on the air outlet through the cooperation of the mounting holes (33), the fixing holes (11) and a connecting member.

3. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 2, wherein, The first end of the G4 fixing joint (31) corresponds to the air outlet, the second end of the G4 fixing joint (31) corresponds to the adapter of the G4 ultrasonic gas meter, and the inner diameter of the first end of the G4 fixing joint (31) is larger than the inner diameter of the second end of the G4 fixing joint (31); The first end of the G6 fixing joint (32) corresponds to the air outlet, the second end of the G6 fixing joint (32) corresponds to the adapter of the G6 ultrasonic gas meter, and the inner diameter of the first end of the G6 fixing joint (32) is smaller than the inner diameter of the second end of the G6 fixing joint (32).

4. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 1, characterized in that, It further includes a flow guide cover (4), and the flow guide cover (4) is fixed on the air inlet of the measuring pipe section (1).

5. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 4, wherein A plurality of limiting blocks (41) are arranged on the side surface of the flow guide cover (4), and a plurality of limiting grooves (12) are provided on the air inlet. The plurality of limiting blocks (41) are arranged corresponding to the plurality of limiting grooves (12) one by one and are matched with each other; the outer side surface of the limiting block (41) is arranged at an acute angle with the side surface of the flow guide cover (4); the flow guide cover (4) is snap-fitted and fixed on the air inlet through the cooperation of the limiting blocks (41) and the limiting grooves (12).

6. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 5, characterized in that, The structure of the flow guide cover (4) is a grid structure arranged in an array, and a reinforcing rib (42) is provided in the middle of the flow guide cover (4).

7. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 1, wherein The transducer (2) includes an upstream ultrasonic probe (21) and a downstream ultrasonic probe (22). The upstream ultrasonic probe (21) is adjacent to the air inlet of the measuring pipe section (1), the downstream ultrasonic probe (22) is adjacent to the air outlet of the measuring pipe section (1), and the upstream ultrasonic probe (21) and the downstream ultrasonic probe (22) are symmetrically arranged on both sides of the measuring pipe section (1).

8. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 1, characterized in that, The structure of the measuring pipe section (1) is an integral structure.

9. The metering module shared by the G4 and G6 ultrasonic gas meters according to claim 1, characterized in that The cross-section of the air inlet of the measuring pipe section (1) is circular, and the cross-section of the metering section of the measuring pipe section (1) is rectangular.

10. The metering module shared by the G4 and G6 ultrasonic gas meters according to any one of claims 1-9, characterized in that, It further includes a metering circuit board (5) and a mounting groove (6), the mounting groove (6) being fixed to the side surface of the measuring pipe section (1); the metering circuit board (5) is fixed in the mounting groove (6), and the metering circuit board (5) is electrically connected to the transducer (2).

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