Gas detection device

Abstract

This application relates to the field of gas detection technology and discloses a gas detection device, including a gas pump, a gas tank, and a detection module. The gas pump is equipped with a suction connector and a discharge connector. The gas tank includes a tank body and a cover. The tank body includes an outer cylinder and an inner cylinder arranged coaxially. The outer cylinder surrounds the outer circumference of the inner cylinder and is spaced apart from the inner cylinder. The inner cylinder is provided with a first air guide hole. The cover is provided with a first connector and a second connector. The first connector communicates with the inner cylinder and is connected to the discharge connector through a gas pipe. The second connector connects the gap between the outer cylinder and the inner cylinder. The detection module is connected to the second connector through a gas pipe. This application solves the technical problem of poor gas detection stability caused by large fluctuations in airflow and pressure during gas detection by setting an outer cylinder and an inner cylinder inside the gas tank to form a multi-stage buffer cavity.

Description

Technical Field

[0001] This application relates to the field of gas detection technology, and more particularly to a gas detection device. Background Technology

[0002] A gas detection device is an instrument used to detect the concentration or composition of a specific gas. It typically consists of a sensor, a signal processing unit, and a display / alarm module. In a gas detection device, physical flow-guiding structures, such as baffles or flow-guiding layers, are incorporated within the gas tank to reduce airflow turbulence, ensuring a stable and uniform gas flow. This prevents pressure-sensitive sensors from experiencing detection distortion or sensor failure due to excessive airflow fluctuations.

[0003] In practical applications, the physical flow guiding structure inside the gas cylinder results in an excessively large internal cavity. A larger cavity volume leads to a longer gas replacement time and a longer period required for complete gas renewal within the cavity, making it difficult to meet the demands of rapid detection. While reducing the cavity volume can speed up the detection response time, it also reduces the buffering effect, causing excessive fluctuations in airflow and pressure, hindering effective buffering and balancing, and ultimately reducing the stability and accuracy of gas detection. Utility Model Content

[0004] The purpose of this application is to provide a gas detection device to solve the technical problem that large fluctuations in airflow and pressure during gas detection lead to a decrease in gas detection stability.

[0005] To achieve the above objectives, this application provides a gas detection device, comprising:

[0006] An air pump, equipped with an air intake connector and an air exhaust connector;

[0007] A gas canister includes a canister body and a cover, the cover covering the canister body. The canister body includes an outer cylinder and an inner cylinder arranged coaxially, the outer cylinder surrounding the outer periphery of the inner cylinder and spaced apart from the inner cylinder. The inner cylinder is provided with a first air guide hole. The cover is provided with a first connector and a second connector, the first connector communicating with the inner cylinder and being connected to an exhaust connector via a gas pipe, the second connector communicating with the gap between the outer cylinder and the inner cylinder.

[0008] The detection module is connected to the second connector via an air tube.

[0009] In the gas detection device of this application, an airflow cavity is formed between the outer cylinder and the inner cylinder;

[0010] At least one intermediate cylinder is provided between the outer cylinder and the inner cylinder. The outer cylinder surrounds the outer periphery of the intermediate cylinder, and the intermediate cylinder surrounds the outer periphery of the inner cylinder, thereby dividing the airflow cavity into at least two annular cavities.

[0011] The intermediate cylinder is provided with a second air guide hole, and two adjacent annular cavities are connected through the second air guide hole;

[0012] The second connector is connected to the outermost annular cavity.

[0013] In the gas detection device of this application, an intermediate cylinder is provided between the outer cylinder and the inner cylinder, and the second air guide hole and the first air guide hole are offset in the axial direction of the gas tank.

[0014] In the gas detection device of this application, the second gas guide hole is located on the side of the intermediate cylinder opposite to the first gas guide hole.

[0015] In the gas detection device of this application, the inlet end of the first connector is connected to the exhaust connector through a gas pipe, and the outlet end of the first connector is connected to the inner cylinder; the first air guide hole is away from the outlet end of the first connector.

[0016] In the gas detection device of this application, the air inlet of the second connector is connected to the gap between the outer cylinder and the inner cylinder, and the air outlet of the second connector is connected to the detection module through an air pipe; the first air guide hole is located away from the air inlet of the second connector.

[0017] In the gas detection device of this application, the cover body is provided with a first cylinder and a second cylinder, the second cylinder surrounding the outer periphery of the first cylinder; the first cylinder is connected to the inner cylinder, and the second cylinder is connected to the outer cylinder.

[0018] In the gas detection device of this application, the first cylinder is sleeved on the outer wall of the inner cylinder, and the second cylinder is sleeved on the inner wall of the outer cylinder;

[0019] The gas detection device includes a first sealing ring and a second sealing ring. The first sealing ring is disposed between the first cylinder and the inner cylinder and abuts against the first cylinder and the inner cylinder respectively.

[0020] The second sealing ring is disposed between the second cylinder and the outer cylinder, and abuts against the second cylinder and the outer cylinder respectively.

[0021] In the gas detection device of this application, the detection module includes a gas chamber and a sensor assembly. The sensor assembly is connected to the gas chamber. The gas chamber is provided with a first air inlet and an air outlet. The first air inlet is connected to a second connector through a gas pipe, and the air outlet is connected to the outside.

[0022] In the gas detection device of this application, the cover is provided with a third connector, which connects the gap between the outer cylinder and the inner cylinder; the gas chamber is provided with a second air inlet;

[0023] The gas detection device also includes a pressure sensor module, which includes a main control board and a differential pressure sensor, a fourth connector, and a fifth connector mounted on the main control board. The fourth connector is connected to the third connector via a gas pipe, and the fifth connector is connected to the second air inlet via a gas pipe.

[0024] This application provides a gas detection device, the advantages of which are:

[0025] The gas detection device of this application includes an air pump, a gas tank, and a detection module. The air pump is equipped with an air intake connector and an air exhaust connector. The gas tank includes a tank body and a cover, and the tank body includes an outer cylinder and an inner cylinder. In use, the air pump draws air, and the gas to be tested enters the air pump through the air intake connector and exits through the air exhaust connector. The pressurized gas to be tested enters the inner cylinder through the air pipe via the first connector, instantly increasing the cavity space and releasing and slowing the turbulent airflow, resulting in a decrease in airflow and pressure. After passing through the inner cylinder, the gas to be tested enters the gap between the outer and inner cylinders through the first air guide hole, further increasing the cavity space and further slowing the airflow velocity, further releasing airflow and pressure. After two stages of buffering, the gas to be tested flows through the second connector to the detection module, where gas detection is completed. In this application, after the above two stages of buffering, the gas to be tested achieves sufficient flow and pressure stabilization, eliminating large fluctuations in airflow and pressure, thereby improving the stability and accuracy of gas detection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the gas detection device provided in the embodiments of this application;

[0028] Figure 2 This is another structural schematic diagram of the gas detection device provided in the embodiments of this application;

[0029] Figure 3 This is a schematic block diagram of a gas detection device provided in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the air pump provided in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of an explosion of a gas cylinder provided in an embodiment of this application;

[0032] Figure 6 A cross-sectional schematic diagram of a gas tank provided in an embodiment of this application;

[0033] Figure 7 This is another cross-sectional view of the gas tank provided in an embodiment of this application;

[0034] Figure 8 This is another cross-sectional view of the gas tank provided in an embodiment of this application;

[0035] Figure 9 This is a schematic diagram of the tank structure provided in an embodiment of this application;

[0036] Figure 10 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0037] The markings in the image are as follows:

[0038] 10. Air pump; 11. Air extraction connector; 12. Air exhaust connector;

[0039] 20. Gas cylinder; 21. Tank body; 211. Outer cylinder; 212. Inner cylinder; 213. First cavity; 214. Second cavity; 215. First air vent; 216. Snap-fit ​​part; 217. Intermediate cylinder; 218. Second air vent; 22. Cover; 221. First connector; 222. Second connector; 223. First cylinder; 224. Second cylinder; 225. Third connector; 226. Snap-fit ​​groove;

[0040] 30. Detection module; 31. Air chamber; 311. First air inlet; 312. Exhaust port; 313. Second air inlet; 32. Sensor assembly;

[0041] 41. First sealing ring; 42. Second sealing ring;

[0042] 50. Pressure sensor module; 51. Main control board; 52. Differential pressure sensor; 53. Fourth connector; 54. Fifth connector;

[0043] 60. Trachea. Detailed Implementation

[0044] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0045] In the description of this application, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc. used in this application to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device and element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] In the description of this application, it should be understood that the terms "first," "second," etc., are used to describe various types of information, but these terms are not limited to them and are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0047] like Figures 1 to 8 As shown in the figure, this application provides a gas detection device, which includes an air pump 10, a gas tank 20, and a detection module 30. The air pump 10 is provided with an air intake connector 11 and an exhaust connector 12. The gas tank 20 includes a tank body 21 and a cover 22, with the cover 22 covering the tank body 21. The tank body 21 includes an outer cylinder 211 and an inner cylinder 212 arranged coaxially. The outer cylinder 211 surrounds the outer periphery of the inner cylinder 212 and is spaced apart from the inner cylinder 212. The inner cylinder 212 is provided with a first air guide hole 215. The cover 22 is provided with a first connector 221 and a second connector 222. The first connector 221 communicates with the inner cylinder 212 and is connected to the exhaust connector 12 through an air pipe 60. The second connector 222 communicates with the gap between the outer cylinder 211 and the inner cylinder 212. The detection module 30 is connected to the second connector 222 through the air pipe 60.

[0048] Based on the above technical solution, the cover 22 covers the can 21, the outer cylinder 211 surrounds the outer periphery of the inner cylinder 212, the inner cylinder 212 forms a first cavity 213, the gap between the outer cylinder 211 and the inner cylinder 212 forms a second cavity 214, the second cavity 214 is located on the outer periphery of the first cavity 213, and the cavity volume of the second cavity 214 is larger than the cavity volume of the first cavity 213.

[0049] In use, the air pump 10 draws air, and the gas to be tested enters the air pump 10 through the air intake connector 11 and exits the air pump 10 through the exhaust connector 12. The pressurized gas to be tested enters the first chamber 213 through the air pipe 60 and the first connector 221. The chamber space instantly expands, releasing and slowing the turbulent airflow, and reducing the air pressure. After passing through the first chamber 213, the gas to be tested enters the second chamber 214 through the first air guide hole 215. Because the volume of the second chamber 214 is larger than that of the first chamber 213, the chamber space expands again, further slowing the airflow velocity and further releasing the pressure. After the above multi-stage buffering, the large fluctuations in the flow rate generated by the air pump 10 and the pressure difference of the gas to be tested are balanced. After multi-stage buffering, the gas to be tested flows from the second connector 222 through the air pipe 60 to the detection module 30, where gas detection is completed.

[0050] In this embodiment, the flow path of the gas to be tested is as follows: the gas pump 10 draws the gas into the gas pumping connector 11, and sequentially passes through the exhaust connector 12 → first connector 221 → first cavity 213 → first air guide hole 215 → second cavity 214 → second connector 222 → detection module 30. After the above two-stage buffering, the gas to be tested is sufficiently stabilized in flow and pressure, and no longer experiences large fluctuations in airflow and pressure, thereby improving the stability and accuracy of gas detection. This gas detection device is suitable for various gas detection scenarios. Whether it is a pressure-sensitive sensor (such as an electrochemical or NDIR infrared sensor) that is sensitive to airflow and pressure fluctuations, or other types of gas sensors, it can improve the service life and reliability of the aforementioned sensors.

[0051] It should be noted that the outer cylinder 211 and the inner cylinder 212 can be cylindrical structures or other shapes. For example, the plane perpendicular to the plane connecting the outer cylinder 211 and the inner cylinder 212 is a horizontal cross-section, and the horizontal cross-sections of the outer cylinder 211 and the inner cylinder 212 are square or prismatic. The shapes of the outer cylinder 211 and the inner cylinder 212 can be the same or different. For example, the horizontal cross-section of the outer cylinder 211 can be circular, and the horizontal cross-section of the inner cylinder 212 can be square, or the horizontal cross-section of the outer cylinder 211 can be circular, and the horizontal cross-section of the inner cylinder 212 can be square. This embodiment does not impose specific limitations.

[0052] In some embodiments, such as Figure 7As shown, an airflow cavity is formed between the outer cylinder 211 and the inner cylinder 212, namely the aforementioned second cavity 214. At least one intermediate cylinder 217 is provided between the outer cylinder 211 and the inner cylinder 212. The outer cylinder 211 surrounds the outer periphery of the intermediate cylinder 217, and the intermediate cylinder 217 surrounds the outer periphery of the inner cylinder 212, thereby dividing the second cavity 214 into at least two annular cavities. The intermediate cylinder 217 is provided with a second air guide hole 218, and adjacent annular cavities are connected through the second air guide hole 218. The second connector 222 is connected to the outermost annular cavity.

[0053] In this embodiment, the shape of the intermediate cylinder 217 can be the same as or different from the shape of the outer cylinder 211 or the inner cylinder 212.

[0054] For example, such as Figure 7 As shown, an intermediate cylinder 217 is provided between the outer cylinder 211 and the inner cylinder 212, dividing the second cavity 214 into a first annular cavity and a second annular cavity. The first annular cavity is located on the side closer to the inner cylinder 212 (i.e., the inner side), and the second annular cavity is located on the side closer to the outer cylinder 211 (i.e., the outer side). The first annular cavity and the second annular cavity are connected through a second air guide hole 218 on the intermediate cylinder 217. In this way, the gas to be tested passes through the first cavity 213 and enters the first annular cavity through the first air guide hole 215, increasing the cavity space. The gas to be tested then enters the second annular cavity through the second air guide hole 218, further increasing the cavity space. After multiple stages of buffering, the gas to be tested can achieve sufficient flow and pressure stabilization.

[0055] For example, two intermediate cylinders are provided between the outer cylinder 211 and the inner cylinder 212, namely a first intermediate cylinder and a second intermediate cylinder. The outer diameter of the first intermediate cylinder is smaller than that of the second intermediate cylinder. The first intermediate cylinder is located on the side closer to the inner cylinder 212 (i.e., the inner side), and the second intermediate cylinder is located on the side closer to the outer cylinder 211 (i.e., the outer side). The first and second intermediate cylinders divide the second cavity 214 into a first annular cavity, a second annular cavity, and a third annular cavity. The outer diameters of the first, second, and third annular cavities gradually increase from the inner cylinder 212 to the outer cylinder 211. In this way, after the gas to be tested passes through the first cavity 213, it passes through the first annular cavity, the second annular cavity, and the third annular cavity in sequence. The cavity space gradually increases, so that the gas to be tested achieves stable flow and pressure after multiple stages of buffering.

[0056] In this embodiment, the outer cylinder 211 and the inner cylinder 212 are not limited to one or two intermediate cylinders, but can also be three or more intermediate cylinders. The multiple intermediate cylinders divide the second cavity 214 into multiple annular cavities with gradually increasing outer diameters. After the gas to be tested is released through the multiple annular cavities, it can be adequately buffered, thereby stabilizing the pressure and flow, so as to facilitate subsequent gas concentration detection.

[0057] In some embodiments, such as Figure 7 As shown, an intermediate cylinder 217 is provided between the outer cylinder 211 and the inner cylinder 212, and the second air guide hole 218 and the first air guide hole 215 are offset in the axial direction of the gas tank 20.

[0058] Specifically, the line connecting the cover 22 and the tank 21 is aligned with the axis of the gas tank 20. The second air guide hole 218 is offset from the first air guide hole 215; the position of the second air guide hole 218 on the intermediate cylinder does not correspond to the position of the first air guide hole 215 on the inner cylinder 212, and the first air guide hole 215 does not face the second air guide hole 218. This results in a longer flow path for the gas to be tested within the annular cavity after passing through the first air guide hole 215, allowing for a more thorough release of the gas pressure.

[0059] For example, such as Figure 7 As shown, the gas cylinder 20 is placed vertically, with the cylinder body 21 connected to the upper part of the cover 22. An intermediate cylinder 217 is provided between the outer cylinder 211 and the inner cylinder 212. The first air guide hole 215 is located at the top of the inner cylinder 212, and the second air guide hole 218 is located at the bottom of the intermediate cylinder 217. When the gas to be tested passes through the first air guide hole 215, the gas to be tested flows from the top to the bottom of the annular cavity, and the gas pressure of the gas to be tested is fully released.

[0060] In some embodiments, such as Figure 8 As shown, the second air guide hole 218 is offset from the first air guide hole 215, and the second air guide hole 218 is located on the side of the intermediate cylinder 217 away from the first air guide hole 215.

[0061] Specifically, in the radial direction of the intermediate cylinder 217, the second air guide hole 218 is located on the side opposite to the first air guide hole 215, and is offset from the first air guide hole 215 in the axial direction of the intermediate cylinder 217, with the second air guide hole 218 having the longest distance from the first air guide hole 215. When the gas to be tested passes through the first air guide hole 215, the flow path from the first air guide hole 215 to the second air guide hole 218 is the longest, and the gas pressure of the gas to be tested is fully released.

[0062] For example, the gas tank 20 is placed vertically, with the tank body 21 connected to the upper part of the cover 22. An intermediate cylinder 217 is provided between the outer cylinder 211 and the inner cylinder 212. The first air guide hole 215 is located on the top left side of the inner cylinder 212, and the second air guide hole 218 is located on the bottom right side of the intermediate cylinder 217; or the first air guide hole 215 is located on the top right side of the inner cylinder 212, and the second air guide hole 218 is located on the bottom left side of the intermediate cylinder 217. In this way, the first air guide hole 215 and the second air guide hole 218 are located diagonally on opposite sides inside the tank body 21, and the flow path from the first air guide hole 215 to the second air guide hole 218 is the longest.

[0063] In some embodiments, a plurality of intermediate cylinders 217 are provided between the outer cylinder 211 and the inner cylinder 212, and the second air guide hole 218 on each intermediate cylinder 217 is offset in the axial direction of the gas tank 20, so that the flow path of the gas to be tested in each annular cavity is relatively long.

[0064] In some embodiments, such as Figure 6 As shown, the air inlet end of the first connector 221 is connected to the exhaust connector 12 through the air pipe 60, and the air outlet end of the first connector 221 is connected to the inner cylinder 212; the first air guide hole 215 is away from the air outlet end of the first connector 221.

[0065] Specifically, the first air guide hole 215 is positioned away from the air outlet end of the first connector 221, making the distance between the first air guide hole 215 and the air outlet end of the first connector 221 relatively long. The gas to be tested enters through the air inlet end of the first connector 221, enters the first cavity 213 of the inner cylinder 212 from the air outlet end of the first connector 221, and then enters the second cavity 214 from the first air guide hole 215. The flow path of the gas to be tested within the first cavity 213 is relatively long.

[0066] For example, the gas canister 20 is placed vertically, with the canister body 21 connected to the upper part of the cover 22. The air inlet end of the first connector 221 is located at the bottom of the first cavity 213, and the first air guide hole 215 is located at the top of the inner cylinder 212. Alternatively, the air inlet end of the first connector 221 extends to the top of the first cavity 213, while the first air guide hole 215 is located at the bottom of the inner cylinder 212.

[0067] In some embodiments, such as Figure 6 As shown, the air inlet of the second connector 222 is connected to the gap between the outer cylinder 211 and the inner cylinder 212 (i.e., the second cavity 214), and the air outlet of the second connector 222 is connected to the detection module 30 through the air pipe 60; the first air guide hole 215 is away from the inner cylinder 212 and away from the air inlet of the second connector 222.

[0068] For example, the gas canister 20 is placed vertically, the canister body 21 is connected to the upper part of the cover 22, the air inlet end of the second connector 222 is located at the bottom right side of the cover 22, the first air guide hole 215 is located at the top left side of the inner cylinder 212, the first air guide hole 215 and the second connector 222 are located diagonally on opposite sides inside the canister body 21, and the gas to be tested has the longest flow path from the first air guide hole 215 to the second connector 222.

[0069] In some embodiments, such as Figures 6 to 10 As shown, the cover 22 is provided with a first cylinder 223 and a second cylinder 224. The second cylinder 224 surrounds the outer periphery of the first cylinder 223. The first cylinder 223 is connected to the inner cylinder 212, and the second cylinder 224 is connected to the outer cylinder 211.

[0070] Specifically, the first cylinder 223 is connected to the inner cylinder 212 to form the first cavity 213, increasing the cavity space of the first cavity 213; the second cylinder 224 is connected to the outer cylinder 211 to form the second cavity 214, increasing the cavity space of the second cavity 214, so that the flow path of the gas to be tested in the first cavity 213 and the second cavity 214 is longer.

[0071] In some embodiments, such as Figure 6 As shown, the first cylinder 223 is fitted onto the outer wall of the inner cylinder 212, and the second cylinder 224 is fitted onto the inner wall of the outer cylinder 211.

[0072] Specifically, the inner diameter of the first cylinder 223 is slightly larger than the outer diameter of the inner cylinder 212, and the first cylinder 223 is fitted onto the outer wall of the inner cylinder 212 to form a first cavity 213. The outer diameter of the second cylinder 224 is slightly smaller than the inner diameter of the outer cylinder 211, and the outer cylinder 211 is fitted onto the outer wall of the second cylinder 224, forming a second cavity 214 between the outer cylinder 211 and the inner cylinder 212.

[0073] In some embodiments, such as Figure 6 As shown, the gas detection device includes a first sealing ring 41 and a second sealing ring 42. The first sealing ring 41 is disposed between the first cylinder 223 and the inner cylinder 212, and abuts against the first cylinder 223 and the inner cylinder 212 respectively. The second sealing ring 42 is disposed between the second cylinder 224 and the outer cylinder 211, and abuts against the second cylinder 224 and the outer cylinder 211 respectively.

[0074] Specifically, the first cylinder 223 is fitted onto the outer wall of the inner cylinder 212, and the first sealing ring 41 abuts against the space between the first cylinder 223 and the inner cylinder 212, improving the sealing at the connection between the first cylinder 223 and the inner cylinder 212. This prevents the gas to be tested from entering the first cavity 213 and then entering the second cavity 214 through the connection between the first cylinder 223 and the inner cylinder 212. The second cylinder 224 is fitted onto the inner wall of the outer cylinder 211, and the second sealing ring 42 abuts against the space between the second cylinder 224 and the outer cylinder 211, improving the sealing at the connection between the second cylinder 224 and the outer cylinder 211. This prevents the gas to be tested from overflowing from the connection between the second cylinder 224 and the outer cylinder 211, thereby improving the stability of the flow of the gas to be tested within the cavity and thus improving the accuracy of gas detection.

[0075] In some embodiments, such as Figure 2 As shown, the detection module 30 includes an air chamber 31 and a sensor assembly 32. The sensor assembly 32 is connected to the air chamber 31. The air chamber 31 is provided with a first air inlet 311 and an exhaust outlet 312. The first air inlet 311 is connected to the second connector 222 through an air pipe 60, and the exhaust outlet 312 is connected to the outside.

[0076] Specifically, after undergoing multiple buffering stages, the gas to be tested flows from the second connector 222 through the gas pipe 60 to the detection module 30, and then enters the gas chamber 31 through the first air inlet 311. It then flows through the detection probe of the sensor assembly 32, where the probe performs concentration detection and analysis. Finally, the gas to be tested is discharged to the external environment through the exhaust port 312, avoiding interference from residual gas and maintaining gas path pressure balance, thereby completing the gas detection.

[0077] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the cover 22 is provided with a third connector 225, which connects the gap between the outer cylinder 211 and the inner cylinder 212 (i.e., the second cavity 214); the air chamber 31 is provided with a second air inlet 313; the gas detection device also includes a pressure sensor module 50, which includes a main control board 51 and a differential pressure sensor 52, a fourth connector 53 and a fifth connector 54 provided on the main control board 51. The fourth connector 53 is connected to the third connector 225 through an air pipe 60, and the fifth connector 54 is connected to the second air inlet 313 through an air pipe 60.

[0078] Specifically, a portion of the gas to be tested within the second chamber 214 flows directly from the second connector 222 to the detection module 30, while another portion flows from the third connector 225 to the pressure sensor module 50. The gas to be tested passes through the differential pressure sensor 52 from the fourth connector 53, and then flows from the fifth connector 54 to the second air inlet 313. The differential pressure sensor 52 detects the pressure difference between the third connector 225 and the second air inlet 313, and determines the gas flow rate within the gas path device based on this pressure difference. When the gas flow rate reaches the set threshold range, the gas flow rate of the air pump 10 is automatically controlled to balance the standard value of the calibration gas flow rate, ensuring flow stability during the detection process.

[0079] For example, the initial calibrated flow rate of the gas to be tested is 500 ml. After the flow rate of the gas to be tested stabilizes at the initial calibrated flow rate of 500 ml for ten minutes, if the differential pressure sensor 52 determines that the gas flow rate change exceeds 10% based on the above differential pressure, the system automatically sends a flow correction command to the air pump 10 to adjust the power of the air pump 10 and balance the initial calibrated flow rate value, thereby realizing automatic control of the flow rate of the air pump 10 and ensuring the stability of the gas flow rate during the detection process.

[0080] In some embodiments, such as Figure 9 and Figure 10 As shown, one of the cover 22 and the can 21 is provided with a snap-fit ​​part 216, and the other of the cover 22 and the can 21 is provided with a snap-fit ​​groove 226. The snap-fit ​​part 216 and the snap-fit ​​groove 226 are snap-fit ​​connected.

[0081] For example, the outer wall of the cover 22 is provided with a snap-fit ​​part 216, and the inner wall of the cover 22 is provided with a snap-fit ​​groove 226. The snap-fit ​​part 216 rotates and embeds into the snap-fit ​​groove 226, and snaps into the snap-fit ​​groove 226, so that the cover 22 and the tank 21 are assembled and fixed, thereby improving the sealing performance at the connection between the cover 22 and the tank 21 and enhancing the overall airtightness of the gas tank 20.

[0082] It should be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0083] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gas detection device, characterized by, include: An air pump, equipped with an air intake connector and an air exhaust connector; A gas canister includes a canister body and a cover, the cover covering the canister body. The canister body includes an outer cylinder and an inner cylinder arranged coaxially, the outer cylinder surrounding the outer periphery of the inner cylinder and spaced apart from the inner cylinder. The inner cylinder is provided with a first air guide hole. The cover is provided with a first connector and a second connector, the first connector communicating with the inner cylinder and being connected to an exhaust connector via a gas pipe, the second connector communicating with the gap between the outer cylinder and the inner cylinder. The detection module is connected to the second connector via an air tube.

2. The gas detection device of claim 1, wherein, An airflow cavity is formed between the outer cylinder and the inner cylinder; At least one intermediate cylinder is provided between the outer cylinder and the inner cylinder. The outer cylinder surrounds the outer periphery of the intermediate cylinder, and the intermediate cylinder surrounds the outer periphery of the inner cylinder, thereby dividing the airflow cavity into at least two annular cavities. The intermediate cylinder is provided with a second air guide hole, and two adjacent annular cavities are connected through the second air guide hole; The second connector is connected to the outermost annular cavity.

3. The gas detection device of claim 2, wherein, An intermediate cylinder is provided between the outer cylinder and the inner cylinder, and the second air guide hole and the first air guide hole are offset from each other in the axial direction of the gas tank.

4. The gas detection device of claim 3, wherein, The second air guide hole is located on the side of the intermediate cylinder opposite to the first air guide hole.

5. The gas detection device of claim 1, wherein, The air inlet of the first connector is connected to the exhaust connector via an air pipe, and the air outlet of the first connector is connected to the inner cylinder; the first air guide hole is located away from the air outlet of the first connector.

6. The gas detection device of claim 5, wherein, The air inlet of the second connector is connected to the gap between the outer cylinder and the inner cylinder, and the air outlet of the second connector is connected to the detection module through an air pipe; the first air guide hole is away from the air inlet of the second connector.

7. The gas detection device of claim 1, wherein, The cover body is provided with a first cylinder and a second cylinder, the second cylinder surrounding the outer periphery of the first cylinder; the first cylinder is connected to the inner cylinder, and the second cylinder is connected to the outer cylinder.

8. The gas detection device of claim 7, wherein, The first cylindrical body is sleeved on the outer wall of the inner cylindrical body, and the second cylindrical body is sleeved on the inner wall of the outer cylindrical body; The gas detection device includes a first sealing ring and a second sealing ring. The first sealing ring is disposed between the first cylinder and the inner cylinder and abuts against the first cylinder and the inner cylinder respectively. The second sealing ring is disposed between the second cylinder and the outer cylinder, and abuts against the second cylinder and the outer cylinder respectively.

9. The gas detection device according to any one of claims 1 to 8, characterized in that, The detection module includes an air chamber and a sensor assembly. The sensor assembly is connected to the air chamber. The air chamber has a first air inlet and an exhaust outlet. The first air inlet is connected to the second connector through an air pipe, and the exhaust outlet is connected to the outside.

10. The gas detection device of claim 9, wherein, The cover is provided with a third connector, which connects the gap between the outer cylinder and the inner cylinder; the air chamber is provided with a second air inlet; The gas detection device further comprises a pressure sensor module, the pressure sensor module comprising a master control board and a differential pressure sensor, a fourth joint and a fifth joint arranged on the master control board, the fourth joint being connected to the third joint through an air pipe, and the fifth joint being connected to the second air inlet through an air pipe.

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