Gas meter

Abstract

The utility model provides a gas meter, and relates to the technical field of gas meters. The gas meter comprises a shell, a metering module and a valve assembly. Wherein the shell comprises a first air inlet, a first air outlet and a first cavity, and the first air inlet and the first air outlet are respectively communicated with the first cavity. The metering module comprises a second cavity, a second air inlet and a second air outlet, the second air inlet is communicated with the second air outlet through the second cavity, the second air inlet is communicated with the first air inlet through the first cavity, and the second air inlet is closer to the bottom wall of the shell than the second air outlet; a part of the inner wall of the second cavity is used as a reflecting surface of the transducer, and an included angle is formed between the reflecting surface and the height direction of the gas meter. The valve assembly comprises a third air inlet and a third air outlet, the third air inlet is communicated with the second air outlet, and the third air outlet is communicated with the first air outlet. By means of the arrangement, miniaturization of the gas meter can be achieved, and the installation requirement of the gas meter is lowered.

Description

Technical Field

[0001] The present application relates to the technical field of gas meters, and in particular to a gas meter. Background Art

[0002] At present, the ultrasonic gas meter includes a shell, a valve assembly and a metering module. The shell includes a cavity and an air inlet and an air outlet respectively connected to the cavity. The valve assembly and the metering module are both installed inside the cavity. The inlet of the valve assembly is connected to the air inlet, and the outlet of the metering module is connected to the air outlet. A gas mixing area is formed between the valve assembly and the metering module, and the outlet of the valve assembly and the inlet of the metering module are respectively connected to the gas mixing area. In order to improve the uniformity of the fluid flowing into the metering module, a sufficient distance needs to be left between the outlet of the valve assembly and the inlet of the metering module, which makes the volume of the gas meter larger, thereby limiting the installation space of the gas meter, and thus the installation requirements of the gas meter are high. Therefore, how to achieve miniaturization of the gas meter has become an urgent problem to be solved. Utility Model Content

[0003] The present application provides a gas meter, which makes the gas meter more compact, realizes miniaturization of the gas meter, and can reduce the installation requirements of the gas meter.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] The present application provides a gas meter, which includes a shell, a metering module and a valve assembly. The shell includes a first air inlet, a first air outlet and a first cavity, and the first air inlet and the first air outlet are respectively connected to the first cavity. The metering module is arranged inside the first cavity, and the metering module includes a second cavity, a second air inlet and a second air outlet, the second air inlet is connected to the second air outlet through the second cavity, the second air inlet is connected to the first air inlet through the first cavity, the second air inlet is closer to the bottom wall of the shell than the second air outlet, a part of the inner wall of the second cavity is used as a reflection surface of the transducer, and the reflection surface has an angle with the height direction of the gas meter. The valve assembly is arranged inside the first cavity, and the valve assembly includes a third air inlet and a third air outlet, the third air inlet is connected to the second air outlet, and the third air outlet is connected to the first air outlet.

[0006] In a possible implementation of the above-mentioned gas meter, the metering module further includes a flow channel body, the flow channel body includes the second cavity, the second air inlet and the air outlet, the flow channel body has an angle with any one of the first direction and the second direction, and the first angle between the flow channel body and the first direction is greater than 0° and less than or equal to 45°. The first direction is perpendicular to the second direction, and the second direction is defined as the height direction of the gas meter.

[0007] In a possible implementation of the above-mentioned gas meter, the metering module also includes a transducer, which is an ultrasonic transducer. The transducer is installed on the flow channel body and is located on one side of the flow channel body along the second direction toward the first air inlet.

[0008] In a possible implementation of the gas meter, a center line of the third air inlet has an angle with any one of a first direction and a second direction, wherein the first direction is perpendicular to the second direction, and the second direction is defined as a height direction of the gas meter.

[0009] In a possible implementation of the above-mentioned gas meter, a second angle between a center line of the third air inlet and the first direction is greater than 0° and less than or equal to 45°.

[0010] In a possible implementation of the above-mentioned gas meter, the gas meter also includes a guide plate, which is installed inside the first cavity, and there is a gap between the guide plate and the first air inlet in the height direction of the gas meter. The orthographic projection of the guide plate in the height direction of the gas meter covers the first air inlet, and the first air inlet and the second air inlet are respectively located on opposite sides of the guide plate.

[0011] In a possible implementation of the above-mentioned gas meter, along the height direction of the gas meter, the side of the guide plate facing away from the first air inlet forms a mixing space with the inner wall of the first cavity, and the second air inlet faces the mixing space and is connected to the mixing space.

[0012] In a possible implementation of the above-mentioned gas meter, along the height direction of the gas meter, a portion of the metering module is located between the guide plate and the top wall of the first cavity.

[0013] In a possible implementation of the above gas meter, along the height direction of the gas meter, the projection of the guide plate covers at least a portion of the second air inlet.

[0014] In a possible implementation of the above-mentioned gas meter, the maximum height of the valve assembly in the second direction is greater than or equal to the maximum height of the metering module in the second direction, or the orthographic projection of the valve assembly in the first direction covers the metering module. The first direction is perpendicular to the second direction, and the second direction is defined as the height direction of the gas meter.

[0015] In a possible implementation of the above-mentioned gas meter, the valve assembly also includes a valve seal and a motor, and the motor and the third air outlet are respectively located on opposite sides of the valve seal in the height direction of the gas meter, and the valve seal is used to block or open the third air outlet under the drive of the motor.

[0016] The gas meter provided in the present application includes a shell, a metering module and a valve assembly. Among them, the shell includes a first air inlet, a first air outlet and a first cavity, and the first air inlet and the first air outlet are respectively connected to the first cavity. The metering module is arranged inside the first cavity, and the metering module includes a second cavity, a second air inlet and a second air outlet. The second air inlet is connected to the second air outlet through the second cavity, and the second air inlet is connected to the first air inlet through the first cavity. The second air inlet is closer to the bottom wall of the shell than the second air outlet. A part of the inner wall of the second cavity is used as a reflecting surface of the transducer. The reflecting surface has an angle with the height direction of the gas meter, so that the reflecting surface is inclined. The valve assembly is arranged inside the first cavity, and the valve assembly includes a third air inlet and a third air outlet. The third air inlet is connected to the second air outlet, and the third air outlet is connected to the first air outlet.

[0017] By rear-mounting the valve assembly at the first air outlet, connecting the second air outlet with the third air inlet, and arranging the second air inlet of the metering module closer to the bottom wall of the shell than the second air outlet, it is possible to not only ensure that there is sufficient spacing between the first air inlet of the shell and the second air inlet of the metering module to ensure the uniformity of the fluid flowing into the metering module, but also to reduce the height dimension of the gas meter, so that the internal device arrangement of the gas meter can be more compact, the gas meter can be miniaturized, and the installation requirements of the gas meter can be reduced. In addition, when the pollutants in the gas enter the interior of the second cavity, the pollutants in the gas can fall on the reflecting surface under the action of gravity. At the same time, the reflecting surface is inclined so that the pollutants on the reflecting surface can also be discharged from the second air inlet under the action of gravity, reducing accumulation in the second cavity and ensuring metering accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a cross-sectional schematic diagram of an ultrasonic gas meter in the related art;

[0020] Figure 2 An explosion diagram of a gas meter provided in an embodiment of the present application;

[0021] Figure 3 for Figure 2 A schematic cross-sectional view of a gas meter is shown;

[0022] Figure 4 for Figure 2 A partial cross-sectional schematic diagram of a gas meter is shown.

[0023] Description of reference numerals:

[0024] 100. Gas meter;

[0025] 10. Shell; 11. First air inlet; 12. First air outlet; 13. First cavity; 14. Upper shell; 15. Lower shell;

[0026] 20. metering module; 21. second air inlet; 22. second air outlet; 23. second cavity; 24. flow channel body; 25. transducer; 26. reflecting surface;

[0027] 30. Valve assembly; 31. Third air outlet; 32. Third air inlet; 33. Valve frame; 34. Valve seal; 35. Motor;

[0028] 40. Guide plate;

[0029] 50. Mixed space;

[0030] 61, first sealing ring; 62, second sealing ring; 63, third sealing ring;

[0031] 70. Support fixed structure;

[0032] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0033] Figure 1 FIG. 1 is a cross-sectional schematic diagram of an ultrasonic gas meter in the related art. Figure 1As shown, the ultrasonic gas meter 500 includes a housing 510, a valve assembly 520 and a metering module 530. The housing 510 includes a cavity 511 and an air inlet 512 and an air outlet 513 respectively connected to the cavity 511. The valve assembly 520 and the metering module 530 are both installed inside the cavity 511, the inlet of the valve assembly 520 is connected to the air inlet 512, the outlet of the metering module 530 is connected to the air outlet 513, and the outlet of the valve assembly 520 is connected to the inlet of the metering module 530 through the cavity 511. A gas mixing area 540 is formed between the valve assembly 520 and the metering module 530, and the outlet of the valve assembly 520 and the inlet of the metering module 530 are respectively connected to the gas mixing area 540.

[0034] However, the existence of the gas mixing area 540 causes the gas meter to be larger in height, making the gas meter larger in size and more expensive. In addition, pollutants such as water vapor and particulate dust in the gas will be deposited inside the metering module 530, affecting the metering accuracy.

[0035] In view of this, the embodiment of the present application provides a gas meter 100, which can realize miniaturization of the gas meter 100 and reduce the cost. In addition, it can also prevent pollutants such as water vapor and dust from accumulating in the metering module 20 to ensure metering accuracy.

[0036] In the embodiment of the present application, the first direction X is a direction perpendicular to the height direction of the gas meter 100 , and the second direction Y is defined as the height direction of the gas meter 100 . Therefore, the first direction X is perpendicular to the second direction Y.

[0037] The gas meter 100 provided in the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0038] Figure 2 A schematic diagram of an explosion of a gas meter provided in an embodiment of the present application is shown in FIG. Figure 3 for Figure 2 The cross-sectional diagram of the gas meter shown in FIG. Figure 4 for Figure 2 A partial cross-sectional schematic diagram of a gas meter is shown.

[0039] See also Figures 2 to 4 As shown, the gas meter 100 provided in the embodiment of the present application includes a housing 10, a metering module 20 and a valve assembly 30. The housing 10 includes a first air inlet 11, a first air outlet 12 and a first cavity 13. The first air inlet 11 and the first air outlet 12 are respectively connected to the first cavity 13. The first air inlet 11 and the second air inlet 21 are arranged along a first direction X. The first air inlet 11 is used for gas to enter the first cavity 13, and the first air outlet 12 is used for gas to leave the first cavity 13.

[0040] For example, see Figure 2and Figure 3 As shown, the housing 10 may include an upper shell 14 and a lower shell 15 , wherein the upper shell 14 is connected to the lower shell 15 and forms a first cavity 13 , and the upper shell 14 has a first air inlet 11 and a second air inlet 21 .

[0041] For example, see Figure 2 As shown, the upper shell 14 and the lower shell 15 can be fixedly connected by a threaded connection. Of course, the upper shell 14 and the lower shell 15 can also be fixedly connected by other methods.

[0042] In some embodiments, in order to improve the sealing performance between the upper shell 14 and the lower shell 15, see Figure 2 and Figure 3 As shown, the gas meter 100 may further include a first sealing ring 61 , which is disposed between the upper shell 14 and the lower shell 15 and abuts against the upper shell 14 and the lower shell 15 , respectively.

[0043] See also Figure 3 As shown, the metering module 20 is arranged inside the first cavity 13, and the metering module 20 includes a flow channel body 24 and a transducer 25. The transducer 25 is installed on the flow channel body 24 and is located outside the transducer 25. The transducer 25 is located on the side of the flow channel body 24 along the second direction Y toward the first air inlet 11.

[0044] There is no limitation on the specific type of the transducer 25. For example, the transducer 25 may be an ultrasonic transducer.

[0045] Continue to see Figure 3 and Figure 4 As shown, the flow channel body 24 may include a second cavity 23, a second air inlet 21 and a second air outlet 22. The second air inlet 21 is connected to the second air outlet 22 through the second cavity 23, and the second air inlet 21 is connected to the first air inlet 11 through the first cavity 13. The second air inlet 21 is closer to the bottom wall of the housing 10 than the second air outlet 22, that is, along the second direction Y, the second air outlet 22 is located between the first air inlet 11 and the second air inlet 21. A portion of the inner wall of the second cavity 23 is used as a reflecting surface 26 of the transducer 25, and the reflecting surface 26 has an angle with any one of the first direction X and the second direction Y, that is, the reflecting surface 26 has an angle with the height direction of the gas meter 100, so that the reflecting surface 26 is inclined.

[0046] When pollutants such as water vapor and particulate dust in the fuel gas enter the second cavity 23, the pollutants in the fuel gas can fall onto the reflecting surface 26 under the action of gravity. At the same time, since the reflecting surface 26 is inclined, the pollutants on the reflecting surface 26 can also be automatically discharged from the second air inlet 21 to the interior of the first cavity 13 under the action of gravity, and cannot accumulate in the second cavity 23, the second air inlet 21 and the second air outlet 22, thereby ensuring the metering accuracy.

[0047] In the embodiment of the present application, there is no limitation on the inclination angle of the reflection surface 26. For example, the angle between the reflection surface 26 and the first direction X may be greater than 0° and less than or equal to 45°.

[0048] See also Figure 3 As shown, the valve assembly 30 is disposed inside the first cavity 13 , and the valve assembly 30 includes a third air inlet 32 ​​and a third air outlet 31 . The third air inlet 32 ​​is communicated with the second air outlet 22 , and the third air outlet 31 is communicated with the first air outlet 12 .

[0049] When the valve assembly 30 is in the open state, the gas (such as Figure 2 The flow path (in the solid arrow) is: the gas first enters the first cavity 13 through the first gas inlet 11, and enters the second cavity 23 through the first cavity 13 and the second gas inlet 21, and then the second gas outlet 22 discharges the gas in the second cavity 23 to the inside of the valve assembly 30, and the gas in the valve assembly 30 is discharged to the outside of the gas meter 100 through the third gas outlet 31 and the first gas outlet 12.

[0050] See also Figure 3 and Figure 4 As shown, the second air outlet 22 is connected to the third air inlet 32, the third air outlet 31 is connected to the first air outlet 12, the valve assembly 30 and the metering module 20 are arranged along the first direction X, so that the valve assembly 30 is installed at the first air outlet 12, and the second air inlet 21 of the metering module 20 is arranged closer to the bottom wall of the shell 10 than the second air outlet 22. This not only ensures that there is enough space between the first air inlet 11 of the shell 10 and the second air inlet 21 of the metering module 20 to ensure the uniformity of the fluid flowing into the metering module 20, but also the devices inside the gas meter 100 can be arranged more compactly, thereby reducing the size of the gas meter 100 in the height direction, reducing the volume of the gas meter 100, and miniaturizing the gas meter 100, thereby reducing the installation requirements of the gas meter 100 and saving costs.

[0051] In order to further reduce the volume of the gas meter 100, in some possible implementations, see Figure 3 and Figure 4As shown, there is an angle between the flow channel body 24 and any one of the first direction X and the second direction Y, so that the flow channel body 24 is arranged at an angle, which can improve the utilization rate of the second cavity 23 and make the arrangement of the internal components of the gas meter 100 more compact. In addition, the reflective surface 26 can also be arranged at an angle to prevent pollutants from being deposited inside the second cavity 23, the second air inlet 21 and the second air outlet 22.

[0052] There is no limitation on the inclination angle of the flow channel body 24. For example, the first angle between the reflection surface 26 and the first direction X can be greater than 0° and less than or equal to 45°, so that not only the internal space of the second cavity 23 can be fully utilized, but also the height dimension of the gas meter 100 can be prevented from being too large due to the length of the flow channel body 24.

[0053] Understandably, see Figure 3 and Figure 4 As shown, the transducer 25 is fixedly mounted on the flow channel body 24, so that when the flow channel body 24 is tilted, the transducer 25 is also tilted accordingly. That is to say, the metering module 20 is tiltedly mounted inside the first cavity 13, which can not only make the internal components of the gas meter 100 more compactly arranged, but also prevent pollutants from being deposited inside the metering module 20 to ensure metering accuracy.

[0054] There is no limitation on how to fix the metering module 20. Figure 3 As shown, a first end of the metering module 20 is fixedly connected to the valve assembly 30 , and a second end of the metering module 20 is connected to the housing 10 , so as to fix the metering module 20 inside the first cavity 13 .

[0055] For example, see Figure 3 and Figure 4 As shown, the gas meter 100 may further include a supporting and fixing structure 70, which is disposed inside the first cavity 13, between the flow channel body 24 and the inner wall of the shell 10 and connected to the shell 10 and the flow channel body 24 respectively.

[0056] In some possible implementations, there is an angle between the center line of the third air inlet 32 ​​and any one of the first direction X and the second direction Y, so that the third air inlet 32 ​​can be set at an angle, so that pollutants such as water vapor, particulate dust, etc. in the fuel gas automatically fall into the second cavity 23 under the action of gravity, thereby avoiding the accumulation of pollutants inside the third air inlet 32.

[0057] For example, the center line of the second air outlet 22 may be tilted so that the center lines of the second air outlet 22 and the third air inlet 32 ​​may coincide with each other, which helps to reduce the difficulty of connecting the second air outlet 22 and the third air inlet 31 .

[0058] There is no limitation on the size of the second angle between the center line of the third air inlet 32 ​​and the first direction X. For example, the second angle between the center line of the third air inlet 32 ​​and the first direction X may be greater than 0° and less than or equal to 45°.

[0059] In order to further reduce the deviation of measurement accuracy, in some possible implementations, see Figures 2 to 4 As shown, the gas meter 100 also includes a guide plate 40, which is installed inside the first cavity 13. There is a gap between the guide plate 40 and the first air inlet 11 in the second direction Y. The orthographic projection of the guide plate 40 in the second direction Y covers the first air inlet 11. The first air inlet 11 and the second air inlet 21 are respectively located on opposite sides of the guide plate 40.

[0060] When the valve assembly 30 is in the open state, after the gas enters the first cavity 13 from the first gas inlet 11, the gas flows more smoothly under the buffering of the guide plate 40, and the gas can be fully mixed before entering the second gas inlet 21. Therefore, by providing the guide plate 40 at the first gas inlet 11, the gas entering the metering module 20 can be fully mixed, so that the deviation of the metering accuracy of the metering module 20 is smaller.

[0061] In some possible implementations, see Figure 3 As shown, along the second direction Y, the side of the guide plate 40 facing away from the first air inlet 11 forms a mixing space 50 with the inner wall of the first cavity 13, and the second air inlet 21 faces the mixing space 50 and is connected to the mixing space 50. In this way, after the buffering effect of the guide plate 40, the gas can be further mixed in the mixing space 50, which helps to further reduce the deviation of the metering accuracy.

[0062] In some possible implementations, along the second direction Y, a portion of the metering module 20 is located between the guide plate 40 and the top wall of the first cavity 13, for example Figure 3 and Figure 4 As shown, a portion of the transducer 25 is located between the guide plate 40 and the top wall of the first cavity 13. This arrangement decouples the guide plate 40 from the metering module 20 in the second direction Y, so that the device layout inside the gas meter 100 is more compact, thereby helping to miniaturize the gas meter 100.

[0063] There is no limitation on how to arrange a part of the metering module 20 between the guide plate 40 and the top wall of the first cavity 13. Figure 2As shown, the guide plate 40 may have a through hole, and a portion of the metering module 20 is located between the guide plate 40 and the top wall of the first cavity 13 through the through hole. Alternatively, in some embodiments, the guide plate 40 may also have a notch, and a portion of the metering module 20 may also be located between the guide plate 40 and the top wall of the first cavity 13 through the notch.

[0064] In some possible implementations, along the second direction Y, the orthographic projection of the guide plate 40 covers at least a portion of the second air inlet 21, for example Figure 3 As shown, the orthographic projection of the guide plate 40 in the second direction Y covers the second air inlet 21. This arrangement extends the flow path of the gas between the first air inlet 11 and the second air inlet 21, providing the gas with enough buffer space, making the gas more stable and facilitating metering.

[0065] In some possible implementations, see Figure 3 As shown, the maximum height of the valve assembly 30 in the second direction Y is greater than the maximum height of the metering module 20 in the second direction Y, or the orthographic projection of the valve assembly 30 in the first direction X can cover the metering module 20, so that the size of the metering module 20 in the second direction Y is decoupled from the height of the gas meter 100, which helps to reduce the difficulty of miniaturization of the gas meter 100.

[0066] In some possible implementations, see Figure 3 As shown, the valve assembly 30 further includes a valve frame 33, a valve seal 34 and a motor 35. The valve frame 33 includes a third air outlet 31 and a third air inlet 32, and the third air outlet 31 and the third air inlet 32 ​​are both connected to the inside and outside of the valve frame 33. The motor 35 is mounted on the valve frame 33, and the motor 35 and the third air outlet 31 are respectively located on opposite sides of the valve seal 34 in the second direction Y. The valve seal 34 is located inside the valve frame 33 and is in transmission connection with the motor 35. The valve seal 34 is used to block or conduct the third air outlet 31 under the drive of the motor 35.

[0067] In some possible implementations, participating Figure 3 As shown, the gas meter 100 may further include a second sealing ring 62 and a third sealing ring 63. The second sealing ring 62 is disposed between the flow channel body 24 and the valve assembly 30 and abuts against the flow channel body 24 and the valve assembly 30 respectively, and the second sealing ring 62 is used to improve the sealing performance of the flow channel body 24 and the valve assembly 30. The third sealing ring 63 is disposed between the housing 10 and the valve assembly 30 and abuts against the housing 10 and the valve assembly 30 respectively, and the third sealing ring 63 is used to improve the sealing performance of the housing 10 and the valve assembly 30.

[0068] The parallelism, perpendicularity, numerical values ​​and numerical ranges involved in the embodiments of the present application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0069] In the description of the embodiments of the present application, it needs to be understood that the terms (if any) "top", "bottom", "up", "down", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] In the description of the embodiments of the present application, it should be understood that the terms "including" and "having" used herein and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0071] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium, which can enable the internal connectivity of two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas meter, characterized in that: Including housing, metering module and valve assembly; The housing comprises a first air inlet, a first air outlet and a first cavity, wherein the first air inlet and the first air outlet are respectively connected to the first cavity; The metering module is arranged inside the first cavity, and the metering module includes a second cavity, a second air inlet and a second air outlet, the second air inlet is connected with the second air outlet through the second cavity, the second air inlet is connected with the first air inlet through the first cavity, the second air inlet is closer to the bottom wall of the shell than the second air outlet, a part of the inner wall of the second cavity is used as a reflection surface of the transducer, and the reflection surface has an angle with the height direction of the gas meter; The valve assembly is disposed inside the first cavity, and includes a third air inlet and a third air outlet. The third air inlet is communicated with the second air outlet, and the third air outlet is communicated with the first air outlet.

2. The gas meter according to claim 1, characterized in that: The metering module also includes a flow channel body, which includes the second cavity, the second air inlet and the air outlet. The flow channel body has an angle with any one of the first direction and the second direction, and the first angle between the flow channel body and the first direction is greater than 0° and less than or equal to 45°; wherein the first direction is perpendicular to the second direction, and the second direction is defined as the height direction of the gas meter.

3. The gas meter according to claim 2, characterized in that: The metering module further includes a transducer, which is an ultrasonic transducer. The transducer is mounted on the flow channel body and is located on a side of the flow channel body that faces the first air inlet along the second direction.

4. The gas meter according to any one of claims 1 to 3, characterized in that: There is an angle between the center line of the third air inlet and any one of the first direction and the second direction; wherein the first direction is perpendicular to the second direction, and the second direction is defined as the height direction of the gas meter.

5. The gas meter according to claim 4, characterized in that: A second angle between a center line of the third air inlet and the first direction is greater than 0° and less than or equal to 45°.

6. The gas meter according to any one of claims 1 to 3, characterized in that: The gas meter also includes a guide plate, which is installed inside the first cavity. There is a gap between the guide plate and the first air inlet in the height direction of the gas meter. The orthographic projection of the guide plate in the height direction of the gas meter covers the first air inlet. The first air inlet and the second air inlet are respectively located on opposite sides of the guide plate.

7. The gas meter according to claim 6, characterized in that: Along the height direction of the gas meter, the side of the guide plate facing away from the first air inlet forms a mixing space with the inner wall of the first cavity, and the second air inlet faces the mixing space and is connected to the mixing space.

8. The gas meter according to claim 6, characterized in that: Along the height direction of the gas meter, a portion of the metering module is located between the guide plate and the top wall of the first cavity.

9. The gas meter according to any one of claims 1 to 3, characterized in that: The maximum height of the valve assembly in the second direction is greater than or equal to the maximum height of the metering module in the second direction, or the orthographic projection of the valve assembly in the first direction covers the metering module; wherein the first direction is perpendicular to the second direction, and the second direction is defined as the height direction of the gas meter.

10. The gas meter according to any one of claims 1 to 3, characterized in that: The valve assembly also includes a valve seal and a motor. The motor and the third air outlet are respectively located on opposite sides of the valve seal in the height direction of the gas meter. The valve seal is used to block or open the third air outlet under the drive of the motor.

Images