Gas flow detection device

Abstract

The utility model discloses a gas flow detection device, which comprises a shell, a gas flow detection device, a gas flow detection device and a gas flow detection device, the shell defines a detection cavity, two ends of the shell along a first direction are respectively provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are both communicated with the detection cavity; the metering module is arranged in the detection cavity, the metering module is provided with a metering channel, and the metering channel is respectively communicated with the air inlet and the air outlet; the motor valve is arranged in the detection cavity, and the motor valve is located on the downstream side of the metering module in the airflow direction; a flow guide channel is further arranged on the inner side of the shell and located on the upstream side of the metering module in the airflow direction, the first end of the flow guide channel is communicated with the air inlet, and the second end of the flow guide channel and an inlet of the metering channel are arranged in a staggered mode. According to the gas flow detection device, gas flows to the metering module after passing through the second end, staggered with the metering channel, of the flow guide channel, the gas flowing through the metering channel of the metering module is stable, and the metering result is accurate.

Description

Technical Field

[0001] The utility model relates to the field of flow detection devices, and particularly relates to a gas flow detection device. Background Art

[0002] The structure of a gas flow detection device (such as a gas meter) includes a metering module and an electric motor valve. The metering module is used to detect the gas flow rate flowing through the gas flow detection device, and the electric motor valve is used to control the opening and closing of the gas flow detection device.

[0003] The existing electric motor valve is arranged at the air inlet end of the gas flow detection device, and the gas directly flows towards the metering module after passing through the electric motor valve. It is easy to cause air flow disturbance when the air flow passes through the metering chamber of the metering module, resulting in an unstable flow field in the metering chamber and inaccurate metering results of the metering module. Content of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the utility model is to provide a gas flow detection device. By arranging a diversion channel in the shell, the gas flows towards the metering module after passing through the second end of the diversion channel which is arranged in a dislocation manner with the metering channel. In this way, the gas flowing through the metering channel of the metering module is stable and the metering result is accurate.

[0005] An embodiment of the utility model provides a gas flow detection device, including: a shell, the shell defines a detection cavity, both ends of the shell along a first direction are respectively provided with an air inlet and an air outlet, and both the air inlet and the air outlet are communicated with the detection cavity; a metering module, the metering module is arranged in the detection cavity, the metering module has a metering channel, and the metering channel is respectively communicated with the air inlet and the air outlet; an electric motor valve, arranged in the detection cavity, and the electric motor valve is located on the downstream side of the metering module in the air flow direction; a diversion channel is further arranged on the inner side of the shell, the diversion channel is located on the upstream side of the metering module in the air flow direction, a first end of the diversion channel is communicated with the air inlet, and a second end of the diversion channel is arranged in a dislocation manner with an inlet of the metering channel.

[0006] When detecting the flow rate of the gas, the gas enters the shell from the air inlet, passes through the diversion channel, flows from the second end of the diversion channel to the metering channel which is arranged in a dislocation manner with it, and then flows out of the shell from the air outlet through the electric motor valve. After the gas flows from the second end of the diversion channel to the inner wall of the shell on the side opposite to the second end, it flows back into the inlet of the metering channel under the blocking action of the inner wall of the shell, increasing the travel of the gas and reducing the flow rate of the gas entering the metering channel, so that the gas flowing through the metering channel is stable and the metering result is accurate.

[0007] In some embodiments, the motor valve is disposed on one side of the metering module facing the air outlet along the first direction, and the metering module is connected to the motor valve.

[0008] Since the second end of the diversion channel is misaligned with the inlet of the metering channel of the metering module, and the motor valve is arranged on the downstream side of the metering module in the gas flow direction. In this way, the position setting of the motor valve will not interfere with the metering data of the metering module. Connecting the metering module and the motor valve is beneficial to saving the housing space, making the structure of the gas flow detection device compact, and thus reducing the production cost.

[0009] According to some embodiments of the present invention, the metering module includes: a flow channel housing that defines the metering channel, and the motor valve includes a valve body that defines a flow-through channel. Both ends of the valve body are respectively connected to the flow channel housing and the inner wall of the air outlet of the housing, so that the metering channel communicates with the air outlet through the flow-through channel.

[0010] The metering channel communicates with the air outlet through the flow-through channel, so that the gas entering the gas flow detection device flows out of the air outlet through the metering channel, making the metering result accurate.

[0011] According to some embodiments of the present invention, the housing includes: a diversion plate disposed in the detection cavity and located on the upstream side of the metering module in the gas flow direction. A diversion channel is formed between the diversion plate and the inner wall of the housing.

[0012] By providing a diversion channel formed between the diversion plate and the inner wall of the housing, it plays a role in diverting the gas entering the housing, which is beneficial to slowing down the gas flow rate, reducing the generation of eddy currents and turbulence, reducing the interference of gas flow on the metering module, and thus improving the detection accuracy of the metering module.

[0013] According to some embodiments of the present invention, at least part of the structure of the diversion plate separates the air inlet and the inlet of the metering channel along the first direction.

[0014] Avoiding the gas entering the detection cavity from the air inlet directly impacting the metering module improves the accuracy of the data measured by the metering module and extends the service life of the metering module.

[0015] Further, the diversion channel includes a first channel section and a second channel section, the diversion plate includes a first diversion plate and a second diversion plate, the first diversion plate is located between the air inlet and the metering channel and is oppositely arranged with the air inlet and the metering channel respectively, the second diversion plate is located on one side of the first diversion plate along the second direction, the first diversion plate and the inner wall of the housing jointly define the first channel section, and the second diversion plate and the inner wall of the housing jointly define the second channel section.

[0016] Through the multi-stage diversion path of the diversion channel, the effect of the diversion channel on slowing down the gas flow rate is improved, so that the gas passes through the metering channel smoothly, further reducing the interference to the metering module and improving the accuracy of the metering result.

[0017] According to some embodiments of the present invention, at least a part of the projection of the second diversion plate in the reference plane coincides with the projection of the metering module in the reference plane, the reference plane is perpendicular to the second direction, and along the first direction, the outlet of the second channel section is located between the inlet of the metering module and the air outlet.

[0018] In this way, the gas travel can be increased, making the flow rate of the gas entering the metering module smoother.

[0019] According to some embodiments of the present invention, one end of the first diversion plate is fixedly connected to the detection cavity, and the other end is connected to the second diversion plate. The gas flow rate detection device further includes: a support member, the inner wall of the detection cavity protrudes towards the second diversion plate to form the support member, the second diversion plate defines a clamping groove, and the support member is clamped in the clamping groove.

[0020] The support member and the first diversion plate support the second diversion plate, improving the structural stability.

[0021] According to some embodiments of the present invention, one end of the valve body facing the air outlet has a connecting portion extending along the first direction, the connecting portion is hermetically connected to the air outlet, the connecting portion is inserted into the air outlet, and at least one of the outer wall of the connecting portion and the inner wall of the air outlet is provided with a groove. The gas flow rate detection device further includes: a sealing ring, and the sealing ring is arranged in the groove.

[0022] The connecting portion and the air outlet are hermetically connected through the sealing ring, improving the sealing effect and preventing gas leakage, thereby improving the reliability of the gas flow rate detection device.

[0023] According to some embodiments of the present invention, a limiting ring is provided on the outer wall of the connecting portion, and the limiting ring abuts against the periphery of the air outlet of the housing.

[0024] By setting a limit ring, it is possible to prevent the connecting part from being excessively inserted into the air outlet, which may cause damage to the valve body. At the same time, the design of the limit ring also facilitates the installation, disassembly and maintenance of the motor valve, simplifies the equipment maintenance process, and reduces the maintenance cost.

[0025] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 is a schematic structural diagram of the gas flow detection device of the present utility model.

[0028] REFERENCE SIGNS

[0029] 100 - Gas flow detection device;

[0030] 110 - Housing; 111 - Detection chamber; 112 - Inlet; 113 - Outlet; 114 - Diversion channel; 114a - First channel section; 114b - Second channel section; 115 - Baffle; 115a - First baffle; 115b - Second baffle; 116 - Support member;

[0031] 120 - Metering module; 121 - Flow channel housing; 122 - Metering channel;

[0032] 130 - Motor valve; 131 - Valve body; 132 - Overflow channel; 133 - Connecting part; 1331 - Groove; 1332 - Limit ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0034] In the prior art, the motor valve is arranged at the inlet end of the gas flow detection device, and the gas directly flows to the metering module after passing through the motor valve, which easily causes air flow disturbance when the air flow passes through the metering chamber of the metering module, resulting in an unstable flow field in the metering chamber and inaccurate metering results of the metering module.

[0035] In view of this, an embodiment of the present utility model provides a gas flow detection device. After the gas passes through the second end of the diversion channel that is misaligned with the metering channel, it flows towards the metering module, increasing the travel of the gas and reducing the flow rate of the gas entering the metering channel, thereby making the gas flowing through the metering channel stable and ensuring accurate metering results.

[0036] Reference is made below Figure 1 , to describe the gas flow detection device 100 according to an embodiment of the present utility model. The gas flow detection device 100 can be used for monitoring the gas consumption of household and industrial users to ensure the accuracy of metering; it can also be used for gas flow control in various scientific research experiments, such as chemical reactions, physical experiments, etc.; it can also be used for monitoring the concentration of pollutants in the air to assist in air quality assessment; it can also be used in the automotive industry to monitor the gas flow in the engine intake and exhaust systems to optimize engine performance. Of course, the gas flow detection device 100 can also be used in other scenarios, and the present application does not limit this.

[0037] The gas flow detection device 100 may include: a housing 110, a metering module 120, and a motor valve 130.

[0038] The housing 110 is used to provide structural support for the gas flow detection device 100 and an installation basis for other structures. The housing 110 defines a detection chamber 111. At both ends of the housing 110 along the first direction, an air inlet 112 and an air outlet 113 are respectively provided, and both the air inlet 112 and the air outlet 113 are communicated with the detection chamber 111. Among them, the first direction may be the X direction as Figure 1 shown.

[0039] The metering module 120 is used to measure the gas flow rate passing through the gas flow detection device 100. The metering module 120 is arranged in the detection chamber 111. The metering module 120 has a metering channel 122, and the metering channel 122 is respectively communicated with the air inlet 112 and the air outlet 113, that is, the gas flows from the air inlet 112, passes through the metering channel 122, and flows out from the air outlet 113, so that the gas passing through the gas flow detection device 100 is all measured, ensuring the accuracy of the metering result.

[0040] A diversion channel 114 is further provided inside the housing 110. The diversion channel 114 is located on the upstream side of the metering module 120 in the air flow direction. The first end of the diversion channel 114 is communicated with the air inlet 112, and the second end of the diversion channel 114 is misaligned with the inlet of the metering channel 122. The gas output from the second end of the diversion channel 114 does not directly flow into the metering channel 122, reducing the impact of the gas on the metering channel 122.

[0041] The motor valve 130 is used to control the opening and closing of the gas flow detection device 100. In case of an emergency (such as gas leakage, fire, etc.), the motor valve 130 is closed to improve the safety of using the gas flow detection device 100. The motor valve 130 is arranged in the detection chamber 111 and is located on the downstream side of the metering module 120 in the air flow direction.

[0042] In the gas flow detection device 100 of the present utility model, when detecting the gas flow rate, the gas enters the housing 110 from the air inlet 112, passes through the diversion channel 114, flows from the second end of the diversion channel 114 to the metering channel 122 which is arranged in a staggered manner, and then flows out of the housing 110 from the air outlet 113 through the motor valve 130. After the gas flows from the second end of the diversion channel 114 to the inner wall of the housing 110 on the side opposite to the second end, it flows back into the inlet of the metering channel 122 under the blocking action of the inner wall of the housing 110, increasing the travel of the gas, making the gas flowing through the metering channel 122 stable, reducing the influence on the metering module 120, and thus improving the accuracy of the metering result.

[0043] In some embodiments, the motor valve 130 is arranged on one side of the metering module 120 facing the air outlet 113 along the first direction. In the related art, the motor valve of the gas flow detection device is installed at the air inlet of the housing. When the motor valve is in the closed state, the gas at the air inlet exerts a pressure towards the detection chamber on the motor valve. After long-term use, it is easy to cause the motor valve to be disconnected from the housing and fail. In this embodiment, the motor valve 130 is installed on one side of the metering module 120 facing the air outlet 113. When the motor valve 130 is in the closed state, the acting force of the gas on the motor valve 130 is towards the air outlet 113, which will not cause the motor valve 130 to be disconnected from the housing 110, and is beneficial to improving the structural stability.

[0044] According to some embodiments of the present utility model, the metering module 120 is connected to the motor valve 130. Since the second end of the diversion channel 114 is arranged in a staggered manner with the inlet of the metering channel 122 of the metering module 120, and at the same time, the motor valve 130 is arranged on the downstream side of the metering module 120 in the air flow direction, in this way, the position setting of the motor valve 130 will not interfere with the metering result of the metering module 120. Connecting the metering module 120 to the motor valve 130 is beneficial to saving the internal space of the housing 110, making the structure of the gas flow detection device 100 compact, and thus reducing the production cost.

[0045] According to some embodiments of the present utility model, the metering module 120 may include a flow channel housing 121, and the flow channel housing 121 defines a metering channel 122. The motor valve 130 may include a valve body 131, the valve body 131 defines a flow-through channel 132, and both ends of the valve body 131 are respectively connected to the inner wall of the flow channel housing 121 and the air outlet 113 of the housing 110, so that the metering channel 122 communicates with the air outlet 113 through the flow-through channel 132. In this way, the metering channel 122 communicates with the air outlet 113 through the flow-through channel 132, so that the gas entering the gas flow detection device 100 all flows out of the air outlet 113 through the metering channel 122, making the metering result accurate.

[0046] Optionally, the metering module 120 may further include a sensor and a communication module. The sensor is used to detect the gas flow rate in the metering channel 122. The sensor is electrically connected to the communication module, and the communication module uploads the data collected by the sensor to an online control center. Moreover, the communication module is also signal-connected to the motor valve 130. When an emergency occurs (such as gas leakage or fire), the online control center sends a control instruction to the motor valve 130 through the communication module, so that the motor valve 130 closes the flow-through channel 132, thereby closing the gas flow detection device 100 and improving the use safety of the gas flow detection device 100.

[0047] According to some embodiments of the present utility model, the housing 110 may include a flow guiding plate 115. The flow guiding plate 115 is disposed in the detection cavity 111 and is located on the upstream side of the metering module 120 in the air flow direction. A flow guiding channel 114 is formed between the flow guiding plate 115 and the inner wall of the housing 110. By providing the flow guiding plate 115 and the inner wall of the housing 110 to form the flow guiding channel 114, it plays a role in guiding the gas entering the housing 110, which is beneficial to making the gas flow smoothly, reducing the generation of eddy currents and turbulence, reducing the interference of the gas flow on the metering module 120, and thus improving the detection accuracy of the metering module 120.

[0048] According to some embodiments of the present utility model, at least part of the structure of the flow guiding plate 115 (such as the first flow guiding plate 115a described later) separates the air inlet 112 and the inlet of the metering channel 122 in the first direction. In this way, the flow guiding plate 115 has a flow guiding effect on the gas flowing into the detection cavity 111 from the air inlet 112, preventing the gas from directly flowing towards the metering module 120 and impacting the metering module 120, thereby extending the service life of the metering module 120.

[0049] Further, the diversion channel 114 may include a first channel section 114a and a second channel section 114b. The diversion plate 115 includes a first diversion plate 115a and a second diversion plate 115b. The first diversion plate 115a is located between the air inlet 112 and the metering channel 122 and is disposed opposite to the air inlet 112 and the metering channel 122 respectively. The second diversion plate 115b is located on one side of the first diversion plate 115a along the second direction, where the second direction may be, for example, Figure 1 the Y direction shown.

[0050] The first diversion plate 115a and the inner wall of the housing 110 jointly define the first channel section 114a, and the second diversion plate 115b and the inner wall of the housing 110 jointly define the second channel section 114b. The first end of the diversion channel 114 is located in the first channel section 114a, and the second end is located in the second channel section 114b. Through the first channel section 114a and the second channel section 114b of the diversion channel 114, a multi-stage diversion path is formed, which improves the effect of the diversion channel 114 in slowing down the gas flow rate, enables the gas to pass through the metering channel 122 smoothly, reduces the interference to the metering module 120, and improves the accuracy of the metering result.

[0051] It can be understood that the first diversion plate 115a may extend along the second direction, or the first diversion plate 115a may also be disposed in the housing 110 at an angle to the second direction, so as to separate the air inlet 112 and the inlet of the metering channel 122.

[0052] Optionally, the first diversion plate 115a and the second diversion plate 115b may be integrally formed with the housing 110 for easy processing, or the first diversion plate 115a and the second diversion plate 115b may also be fixedly installed in the housing 110 by screwing or welding for easy maintenance and replacement.

[0053] According to some embodiments of the present invention, at least a part of the projection of the second diversion plate 115b in the reference plane coincides with the projection of the metering module 120 in the reference plane, and the reference plane is perpendicular to the second direction. In other words, when the outlet of the second channel section 114b, that is, the second end of the diversion channel 114, is misaligned with the inlet of the metering channel 122 along the second direction, the outlet of the second channel section 114b may partially overlap with the inlet of the metering channel 122 in the first direction. Thus, along the first direction, the outlet of the second channel section 114b is located between the inlet of the metering module 120 and the air outlet 113. The gas flowing out of the outlet of the second channel section 114b needs to pass through the inner wall of the housing 110 opposite to the outlet of the second channel section 114b and then turn back and flow into the metering channel 122, which prolongs the travel of the gas, makes the gas flowing through the metering channel 122 smooth, reduces the interference to the metering module 120, and improves the accuracy of the metering result.

[0054] According to some embodiments of the present utility model, one end of the first flow guiding plate 115a is fixedly connected to the detection chamber 111, and the other end is connected to the second flow guiding plate 115b. The first flow guiding plate 115a supports one end of the second flow guiding plate 115b. The gas flow rate detection device 100 may further include a support member 116. The inner wall of the detection chamber 111 protrudes towards the second flow guiding plate 115b to form the support member 116. The support member 116 may be a plate-like structure. The second flow guiding plate 115b defines a card slot, and the support member 116 is clamped in the card slot. In this way, the second flow guiding plate 115b is supported at multiple points by the first flow guiding plate 115a and the support member 116, improving the structural stability of the second flow guiding plate 115b installed in the detection chamber 111.

[0055] According to some embodiments of the present utility model, one end of the valve body 131 facing the air outlet 113 has a connecting portion 133 extending in the first direction, and the connecting portion 133 is hermetically connected to the air outlet 113.

[0056] The valve body 131 is hermetically connected to the air outlet 113 through the connecting portion 133, so that the gas entering the detection chamber 111 can only flow out from the air outlet 113 through the metering channel 122 and the overflow channel 132, improving the accuracy of the metering result.

[0057] According to some embodiments of the present utility model, the connecting portion 133 is inserted into the air outlet 113, and at least one of the outer wall of the connecting portion 133 and the inner wall of the air outlet 113 is provided with a groove 1331. The gas flow rate detection device 100 may further include a sealing ring (not shown in the figure), and the sealing ring is arranged in the groove 1331. For example, the outer wall of the connecting portion 133 is provided with a groove 1331, and the sealing ring is arranged in the groove 1331 to fill the gap between the outer wall of the connecting portion 133 and the inner wall of the air outlet 113, realizing the sealing connection between the motor valve 130 and the air outlet 113; or, the inner wall of the air outlet 113 is provided with a groove 1331, and the sealing ring is arranged in the groove 1331 to fill the gap between the outer wall of the connecting portion 133 and the inner wall of the air outlet 113, realizing the sealing connection between the motor valve 130 and the air outlet 113; it may also be that the outer wall of the connecting portion 133 and the inner wall of the sealing ring are both provided with grooves 1331, the inner ring of the sealing ring is located in the groove 1331 on the connecting portion 133, and the outer ring of the sealing ring is located in the groove 1331 on the inner wall of the air outlet 113, thereby filling the gap between the outer wall of the connecting portion 133 and the inner wall of the air outlet 113, realizing the sealing connection between the motor valve 130 and the air outlet 113. The connecting portion 133 and the air outlet 113 are hermetically connected through the sealing ring, improving the sealing effect and preventing gas leakage, thereby improving the reliability of the gas flow rate detection device 100.

[0058] According to some embodiments of the present utility model, a limiting ring 1332 is provided on the outer wall of the connecting portion 133, and the limiting ring 1332 abuts against the periphery of the air outlet 113 of the housing 110.

[0059] By providing the limiting ring 1332, it is avoided that the connecting portion 133 is excessively inserted into the air outlet 113, resulting in damage to the valve body 131; meanwhile, the design of the limiting ring 1332 also facilitates the disassembly and maintenance of the motor valve 130, simplifies the equipment maintenance process, and reduces the maintenance cost.

[0060] The principle of the gas flow detection device 100 of the present utility model is as follows:

[0061] Gas flows in from the air inlet 112, passes through the first end of the diversion channel 114, flows out from the second end of the diversion channel 114 which is arranged offset from the metering channel 122, the gas flow is measured through the metering channel 122, and then passes through the flow-through channel 132 of the motor valve 130 and flows out from the air outlet 113.

[0062] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0063] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features.

[0064] In the description of the present utility model, the meaning of "a plurality" is two or more.

[0065] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0066] In the description of the present utility model, the first feature being "above", "above the" and "on the" second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0067] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A gas flow detection device (100), characterized in that: include: A housing (110), the housing (110) defining a detection cavity (111), the housing (110) being provided with an air inlet (112) and an air outlet (113) at two ends along a first direction, respectively, the air inlet (112) and the air outlet (113) both being in communication with the detection cavity (111); A metering module (120), the metering module (120) being arranged in the detection chamber (111), the metering module (120) having a metering channel (122), the metering channel (122) being respectively connected to the air inlet (112) and the air outlet (113); A motor valve (130) is disposed in the detection chamber (111), and the motor valve (130) is located on the downstream side of the metering module (120) in the airflow direction; A guide channel (114) is also provided on the inner side of the shell (110), and the guide channel (114) is located on the upstream side of the metering module (120) in the airflow direction. The first end of the guide channel (114) is connected to the air inlet (112), and the second end of the guide channel (114) is staggered with the entrance of the metering channel (122).

2. The gas flow detection device (100) according to claim 1, characterized in that: The motor valve (130) is arranged on a side of the metering module (120) facing the air outlet (113) along the first direction, and the metering module (120) is connected to the motor valve (130).

3. The gas flow detection device (100) according to claim 2, characterized in that: The metering module (120) comprises: a flow channel housing (121), wherein the flow channel housing (121) defines the metering channel (122), The motor valve (130) comprises a valve body (131), the valve body (131) defines a flow passage (132), and two ends of the valve body (131) are respectively connected to the flow passage housing (121) and the inner wall of the air outlet (113) of the shell (110), so that the metering channel (122) is connected to the air outlet (113) through the flow passage (132).

4. The gas flow detection device (100) according to any one of claims 1 to 3, characterized in that: The shell (110) comprises: a guide plate (115), the guide plate (115) being arranged in the detection cavity (111) and being located on the upstream side of the metering module (120) in the airflow direction, and the guide channel (114) being formed between the guide plate (115) and the inner wall of the shell (110).

5. The gas flow detection device (100) according to claim 4, characterized in that: At least a portion of the structure of the guide plate (115) separates the air inlet (112) and the entrance of the metering channel (122) along the first direction.

6. The gas flow detection device (100) according to claim 5, characterized in that: The flow guiding channel (114) comprises a first channel section (114a) and a second channel section (114b). The guide plate (115) comprises a first guide plate (115a) and a second guide plate (115b), wherein the first guide plate (115a) is located between the air inlet (112) and the metering channel (122), and is arranged opposite to the air inlet (112) and the metering channel (122), respectively, and the second guide plate (115b) is located on one side of the first guide plate (115a) along the second direction. The first guide plate (115a) and the inner wall of the shell (110) together define the first channel section (114a), and the second guide plate (115b) and the inner wall of the shell (110) together define the second channel section (114b).

7. The gas flow detection device (100) according to claim 6, characterized in that: The projection of at least part of the second guide plate (115b) in the reference plane coincides with the projection of the metering module (120) in the reference plane, and the reference plane is perpendicular to the second direction. Along the first direction, the outlet of the second channel section (114b) is located between the inlet of the metering module (120) and the air outlet (113).

8. The gas flow detection device (100) according to claim 6, characterized in that: One end of the first guide plate is fixedly connected to the detection chamber (111), and the other end is connected to the second guide plate (115b). The gas flow detection device (100) further comprises: a support member (116); an inner wall of the detection cavity (111) protrudes toward the second guide plate (115b) to form the support member (116); the second guide plate (115b) defines a slot, and the support member (116) is clamped in the slot.

9. The gas flow detection device (100) according to claim 3, characterized in that: One end of the valve body (131) facing the air outlet (113) has a connecting portion (133) extending along the first direction, and the connecting portion (133) is sealedly connected to the air outlet (113); The connecting portion (133) is inserted into the air outlet (113), and at least one of the outer wall of the connecting portion (133) and the inner wall of the air outlet (113) is provided with a groove (1331). The gas flow detection device (100) further comprises: a sealing ring, wherein the sealing ring is arranged in the groove (1331).

10. The gas flow detection device (100) according to claim 9, characterized in that: The outer wall of the connecting portion (133) is provided with a limiting ring (1332), and the limiting ring (1332) abuts against the periphery of the air outlet (113) of the shell (110).

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