Gas detection device

Abstract

The application discloses a gas detection device, comprising a first detection unit and a second detection unit, the first detection unit comprising a gas detection assembly and a first detection shell, the first detection unit having a first gas chamber, the gas detection assembly and the first detection shell being arranged at the periphery of the first gas chamber, the first detection shell having a matching hole, the matching hole being in communication with the first gas chamber and the outside gas of the gas detection device, the second detection unit comprising a pressure detection assembly and a second detection shell, the second detection unit having a second gas chamber, the second detection shell being arranged at the periphery of the second gas chamber, the pressure detection assembly being located in the second gas chamber, the second gas chamber being in gas communication with the first gas chamber, and the first gas chamber being in communication with the outside gas of the gas detection device through the matching hole. The gas detection device is beneficial to improve the waterproof and dustproof performance of the second detection unit.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and in particular to a gas detection device. Background Technology

[0002] The gas detection device includes a housing, a detection unit, and a circuit board. The detection unit is electrically connected to the circuit board, and both the detection unit and the circuit board are located within the housing cavity, protected by the housing. The detection unit includes a gas detection unit and a pressure detection unit. The pressure detection unit is used to compensate for the pressure of the gas detection unit's detection results, thereby improving the detection accuracy of the gas detection unit. Both the gas detection unit and the pressure detection unit have their own housings with vents. Each unit has its own gas chamber; the gas detection unit detects the gas in its chamber, and the pressure detection unit detects the pressure of the gas in its chamber. During the detection process, the pressure difference between the two chambers may prevent the pressure detection unit from accurately compensating for the pressure of the gas detection unit's results.

[0003] Therefore, the structure of the gas detection device needs to be improved so that the pressure detection unit can accurately compensate for the results of the gas detection unit, thereby improving the detection accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a gas detection device with high detection accuracy.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A gas detection device includes a first detection unit and a second detection unit.

[0007] The first detection unit includes a gas detection component and a first detection housing. The first detection unit has a first gas chamber. The gas detection component and the first detection housing are both disposed around the first gas chamber. The first detection housing has a mating hole that communicates with the first gas chamber and with the external gas of the gas detection device.

[0008] The second detection unit includes a pressure detection component and a second detection housing. The second detection unit has a second air chamber, and the second detection housing is disposed around the second air chamber. The pressure detection component is located in the second air chamber.

[0009] The second gas chamber is in gas communication with the first gas chamber, and the first gas chamber is in gas communication with the external gas of the gas detection device through the mating hole.

[0010] In the gas detection device of the present invention, a first detection unit includes a gas detection component and a first detection housing, capable of gas detection; a second detection unit includes a pressure detection component and a second detection housing, capable of pressure detection. The first detection unit has a first gas chamber, and the first detection housing is disposed around the first gas chamber. The first detection housing has a mating hole that connects the first gas chamber to the outside of the first detection unit. The second detection unit has a second gas chamber that is in gas communication with the first gas chamber, and the second gas chamber is connected to the external gas of the gas detection device through the mating hole in the first detection housing. Thus, the pressure in the second gas chamber tends to be the same as that in the first gas chamber, improving the accuracy of pressure compensation from the pressure detection unit to the gas detection unit, thereby improving the detection accuracy of the gas detection device. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of the gas detection device of the present invention;

[0012] Figure 2 for Figure 1 An exploded view of the gas detection device shown.

[0013] Figure 3 for Figure 1 A three-dimensional sectional view of the gas detection device shown.

[0014] Figure 4 for Figure 1 An exploded view of the detection module and circuit board shown.

[0015] Figure 5 for Figure 4 A three-dimensional schematic diagram of the detection module shown;

[0016] Figure 6 for Figure 5 A three-dimensional schematic diagram of the detection module from another angle;

[0017] Figure 7 for Figure 5 A three-dimensional cross-sectional view of the detection module shown;

[0018] Figure 8 for Figure 7 A three-dimensional cross-sectional view of the detection module from another angle;

[0019] Figure 9 for Figure 5 An exploded view of the detection module shown.

[0020] Figure 10 for Figure 2 A three-dimensional schematic diagram of the outer casing shown;

[0021] Figure 11 for Figure 10A three-dimensional sectional view of the outer shell shown;

[0022] Figure 12 for Figure 2 A three-dimensional schematic diagram of the base shown;

[0023] Figure 13 This is a schematic diagram of the first and second straight lines of the gas detection device of the present invention;

[0024] Figure 14 This is a schematic diagram of the third and fourth straight lines of the gas detection device of the present invention;

[0025] Figure 15 for Figure 2 The first detection housing and the second detection housing are shown in a three-dimensional sectional view. Detailed Implementation

[0026] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of the present invention as set forth in the claims.

[0027] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. The singular forms “a,” “the,” or “the” as used in the specification and claims of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features. Similarly, the terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "before," "after," "upper," "lower," and similar words appearing in this invention are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" are an open-ended expression, meaning that the element preceding "comprising" or "including" encompasses the element following "comprising" or "including" and its equivalents, but this does not preclude the element preceding "comprising" or "including" from also including other elements. In this invention, the term "several" means two or more.

[0029] like Figures 1 to 15 The diagram illustrates a gas detection device according to the present invention, comprising a housing 1, a detection module 2, and a circuit board 3. The housing 1 has an inner cavity 300, and at least a portion of the detection module 2 and at least a portion of the circuit board 3 are housed within the inner cavity 300. In some embodiments, the gas detection device can be used to detect the concentration of gaseous refrigerant, enabling timely detection and feedback to the air conditioning control system in the event of refrigerant leakage, thereby reducing the safety hazards caused by refrigerant leakage. Of course, in other embodiments, the gas detection device can also be applied in other environments to detect other gases, such as methane, ethane, and carbon dioxide. The present invention does not impose excessive limitations on this.

[0030] See Figure 4 The detection module 2 includes a first detection unit 21 and a second detection unit 22, both housed within an inner cavity 300. Both the first detection unit 21 and the second detection unit 22 are mounted on a circuit board 3. The first detection unit 21 is used to detect the concentration of a gaseous refrigerant (e.g., environmentally friendly refrigerants such as R32 and R454B). In the embodiments of the present invention, the first detection unit 21 employs an optical detection principle. Specifically, the first detection unit 21 can employ an infrared light detection principle. In other embodiments, the first detection unit 21, depending on its working principle, can also be a semiconductor type, a thermal conductivity type, an electrochemical type, a catalytic combustion type, an ultrasonic type, etc. The second detection unit 22 is used to detect the pressure of the gaseous refrigerant (e.g., environmentally friendly refrigerants such as R32 and R454B).

[0031] Circuit board 3 is housed within cavity 300, and at least a portion of housing 1 is attached to circuit board 3. Both first detection unit 21 and second detection unit 22 are electrically connected to circuit board 3. Circuit board 3 also includes a processing chip (not shown) and several electronic components (not shown), see [link to documentation]. Figure 4 The circuit board 3 includes a second surface 31 and a third surface 32 located on opposite sides of its thickness direction. In the embodiment illustrated in the figure, the first detection unit 21 and the second detection unit 22 are both mounted on the second surface 31 of the circuit board 3, and the processing chip and several electronic components are mounted on the third surface 32 of the circuit board 3. Of course, in other embodiments, the first detection unit 21, the second detection unit 22, the processing chip, and several electronic components can all be mounted on the same side surface of the circuit board 3. The processing chip is used to process the signal of gaseous refrigerant concentration detected by the first detection unit 21 and transmit it to an external control board or process it itself; it can also process the signal of gaseous refrigerant pressure detected by the second detection unit 22. The several electronic components include filtering elements such as capacitors, resistors, and inductors, thereby amplifying and filtering the signals from the first detection unit 21 and the second detection unit 22.

[0032] In the embodiment illustrated in the present invention, the outer shell 1 is integrally injection molded. This involves melting plastic, placing the detection module 2 and circuit board 3 into a mold, injecting the molten plastic into the mold, and then cooling and solidifying it. This method is convenient and cost-effective. Related technologies use a split-structure outer shell, assembled from an upper and lower shell, which results in poor sealing, making the detection module 2 and circuit board 3 susceptible to moisture and affecting performance. Furthermore, the split-structure outer shell is thicker. The integral outer shell 1 of the present invention provides good sealing, improving waterproof performance. The outer shell 1 of the present invention encloses at least a portion of the detection module 2 and at least a portion of the circuit board 3. The design of the outer shell 1 has minimal impact on the overall thickness, reducing the overall thickness of the gas detection device and facilitating installation. At least a portion of the outer shell 1 is attached to at least one of the first detection unit 21 and the second detection unit 22.

[0033] See Figure 10 The outer casing 1 includes a first casing portion 11, a second casing portion 12, and a third casing portion 13. The first casing portion 11 and the second casing portion 12 are integrally formed on the upper end of the third casing portion 13. The second casing portion 12 is connected to one side of the first casing portion 11 in the width direction WW. Figure 11 As shown, the first housing portion 11 has a first inner cavity 111, and the first housing portion 11 is located on the periphery of the first inner cavity 111. A mating hole 211 is provided in the first housing portion 11. The second housing portion 12 has a second inner cavity 121, and the second housing portion 12 is located on the periphery of the second inner cavity 121. The third housing portion 13 has a third inner cavity 131. The first inner cavity 111, the second inner cavity 121, and the third inner cavity 131 are connected. The inner cavity 300 is composed of the first inner cavity 111, the second inner cavity 121, and the third inner cavity 131. The first detection unit 21 is housed in the first inner cavity 111. At least a portion of the first housing portion 11 is fitted with the first detection unit 21, and the vent 14 is aligned with the mating hole 211. The second detection unit 22 is housed in the second inner cavity 121. At least a portion of the second housing portion 12 is fitted with the second detection unit 22. At least a portion of the first detection unit 21 is housed in the first inner cavity 111, at least a portion of the second detection unit 22 is housed in the second inner cavity 121, and the circuit board 3 is housed in the third inner cavity 131. The volume of the first inner cavity 111 is slightly larger than the volume of the first detection unit 21, the volume of the second inner cavity 121 is slightly larger than the volume of the second detection unit 22, and the volume of the third inner cavity 131 is slightly larger than the volume of the circuit board 3.

[0034] See also Figure 10 The outer casing 1 also has a vent 14, which is located in the first casing portion 11. During the injection molding process of the outer casing 1, a certain area is left unmolded; after injection molding, this area forms the vent 14. See also Figure 5The first detection unit 21 includes a first detection housing 211, the outer surface of which at least partially contacts the inner surface of the first housing portion 11; the second detection unit 22 includes a second detection housing 221, the outer surface of which at least partially contacts the inner surface of the second housing portion 12. That is, the shape of the first housing portion 11 is adapted to the shape of the first detection housing 211, and the shape of the second housing portion 12 is adapted to the shape of the second detection housing 221, which is beneficial to reducing the volume of the gas detection device.

[0035] See Figure 10 The first housing portion 11 includes a fifth wall portion 112 and a first peripheral wall 113 extending vertically from the fifth wall portion 112; the second housing portion 12 includes a sixth wall portion 122 and a second peripheral wall 123 extending vertically from the sixth wall portion 122; the fifth wall portion 112 and the sixth wall portion 122 are connected, and the first peripheral wall 113 is connected to the second peripheral wall 123. See also Figure 5 and Figure 6The first detection housing 211 includes a first wall portion 201 and a second wall portion 202, which are located on both sides of the width direction WW of the first detection housing 211. The first detection housing 211 also includes a third wall portion 203 and a fourth wall portion 204, which are located on both sides of the height direction HH of the first detection housing 211, with the third wall portion 203 located above the fourth wall portion 204. The second detection housing 221 includes a seventh wall portion 205 and a third peripheral wall 206 extending vertically from the seventh wall portion 205. The third peripheral wall 206 is connected to the first wall portion 201, or the third peripheral wall 206 is connected to the second wall portion 202. Vent 14 is located on the fifth wall portion 112 of the outer casing 1. The first detection unit 21 has a mating hole 2111, which penetrates the first detection housing 211 and is located on the third wall portion 203 of the first detection housing 211. The mating hole 2111 communicates with the vent 14 and is connected to the external gas of the gas detection device through the vent 14. There are multiple mating holes 2111, which are arranged in a row at equal intervals. All mating holes 2111 are connected to the vent 14. Gas enters directly from the vent 14 into the mating hole 2111, entering the first gas chamber 100 more quickly, improving the time response of the gas detection device to gas, enabling rapid gas detection and rapid alarm. There is no gas flow space between the outer surface of the third wall portion 203 and the inner surface of the fifth wall portion 112. The detection gas enters the mating hole 2111 directly from the vent 14, which facilitates the rapid entry of the detection gas into the first detection housing 211, improves the time response of the first detection unit 21 to the detection gas, and enables rapid gas detection and rapid alarm. In the embodiment illustrated in the present invention, a breathable membrane is provided between the outer surface of the third wall portion 203 and the inner surface of the fifth wall portion 112. The two surfaces of the membrane are in contact with the outer surface of the third wall portion 203 and the inner surface of the fifth wall portion 112, respectively. The detection gas will not enter the inner cavity 100 of the outer shell 1. At the same time, the membrane can also play a waterproof role. Of course, in other embodiments, at least part of the outer surface of the third wall portion 203 is in direct contact with the inner surface of the fifth wall portion 112. The detection gas enters the first detection housing 211 directly through the vent 14 and will not enter the inner cavity 100 of the outer shell 1, thus avoiding gas concentration dilution.

[0036] In the illustrated embodiment of the present invention, at least a portion of the outer surface of the first wall portion 201 and at least a portion of the outer surface of the second wall portion 202 are in contact with the inner surface of the first peripheral wall 113; at least a portion of the outer surface of the seventh wall portion 205 is in contact with the inner surface of the sixth wall portion 122; and at least a portion of the outer surface of the third peripheral wall 206 is in contact with the inner surface of the second peripheral wall 123, which is beneficial for reducing the volume of the gas detection device. Of course, in other embodiments, there may also be a gap between the outer surface of the first wall portion 201 and the outer surface of the second wall portion 202 and the inner surface of the first peripheral wall 113; a gap may exist between the outer surface of the seventh wall portion 205 and the inner surface of the sixth wall portion 122; and a gap may exist between the outer surface of the third peripheral wall 206 and the inner surface of the second peripheral wall 123.

[0037] The first detection housing 211 can be an elongated cylindrical housing, and its cross-section can be rectangular, circular, or other shapes. In this embodiment, the first detection housing 211 with a rectangular outer contour of its cross-section is illustrated. In other embodiments, a non-reflective air chamber can also be constructed inside the first detection housing 211, meaning that the light emitted by the light source can reach the detection probe after several reflections. In the following embodiments of the present invention, a cylindrical air chamber is constructed inside the first detection housing 211 as an example for detailed explanation. The cross-section of the second detection housing 221 can be rectangular, circular, or other shapes. In this embodiment, the first detection housing 211 with a rectangular outer contour of its cross-section is illustrated.

[0038] The first detection housing 211 and the second detection housing 221 are an integral structure, with the second detection housing 221 located on one side of the width direction WW of the first detection housing 211. Specifically, the first detection housing 211 and the second detection housing 221 can be integrally injection molded, that is, by melting plastic, injecting the molten plastic into a mold, and then cooling and molding it, which is convenient to manufacture and has low cost.

[0039] See Figure 9 The first detection unit 21 further includes gas detection components 212 and 213, which include a light source module 212 and a detection probe 213. The light source module 212 is located at one end of the length direction of the first detection housing 211 and is used to emit light. The detection probe 213 is located at the other end of the length direction of the first detection housing 211 and is used to receive light. The light source module 212 can be selected as an infrared light source, and correspondingly, the detection probe 213 is an infrared detection probe. The light source module 212 and the detection probe 213 are almost coaxially arranged. The first detection housing 211 is cylindrical, and the infrared light emitted by the light source module 212 is incident on the detection probe 213 almost in a straight line. The light source module 212 and the detection probe 213 are electrically connected to the circuit board 3.

[0040] See Figure 3 and Figure 4 The second detection unit 22 also includes a pressure detection component 222 for sensing pressure. The pressure detection component 222 is housed in the second gas chamber 200 and fixed to the second surface 31 of the circuit board 3. Specifically, the pressure detection component 222 is fixedly connected to the circuit board 3 by soldering. In use, the detection gas enters the second gas chamber 200 from the first gas chamber 100 through the through-hole 101 and directly contacts the pressure-sensing surface of the pressure detection component 222 for pressure measurement. Since the gas concentration is affected by pressure, pressure compensation is performed by the second detection unit 22 to assist the first detection unit 21 in determining the gas concentration, thereby improving detection accuracy.

[0041] See Figure 3 The first detection unit 21 has a first gas chamber 100. Gas detection components 212 and 213 and a first detection housing 211 are all disposed around the first gas chamber 100. A mating hole 2111 communicates with the first gas chamber 100 and is also connected to the external gas of the detection module. The second detection unit 22 has a second gas chamber 200. A second detection housing 221 is disposed around the second gas chamber 200, and a pressure detection component 222 is located in the second gas chamber 200. The second gas chamber 200 is in gas communication with the first gas chamber 100, and the first gas chamber 100 is connected to the external gas of the gas detection device through the mating hole 211. In this way, the pressure of the second gas chamber and the first gas chamber tends to be the same, which improves the accuracy of pressure compensation of the pressure detection unit to the gas detection unit, thereby improving the detection accuracy of the gas detection device.

[0042] The detection module 2 also includes a partition 10, which is connected to at least one of the first detection housing 211 and the second detection housing 221. The partition 10 is located between the first detection housing 211 and the second detection housing 221. The partition 10 has a through hole 101, which connects the first gas chamber 100 and the second gas chamber 200. The extension direction of the mating hole 2111 is not the same as the extension direction of the through hole 101. In use, the detection gas first enters the first gas chamber 100, and then enters the second gas chamber 200 through the through hole 101. The second gas chamber 200 does not have a hole directly communicating with the outside of the gas detection device, which helps to improve waterproof and dustproof performance.

[0043] See Figure 7 , Figure 8 and Figure 15The partition 10 includes a first surface 102 exposed to the second gas chamber 200. The partition 10 has a groove 103 recessed from the first surface 102 into the partition 10, and a through hole 101 communicating with the groove 103. The partition 10 also has an arcuate surface 104, which is the outer periphery of the groove 103. The arcuate surface 104 extends from one end of the partition 10 along the height direction HH of the gas detection device. The groove 103 improves the waterproof and dustproof performance of the second detection unit 22.

[0044] In the embodiment illustrated in this application, the partition 10 has a plurality of grooves 103 and a plurality of through holes 101, the number of through holes 101 being equal to the number of grooves 103. See also Figure 15 The partition 10 between two adjacent grooves 103 forms a reinforcing part 105, and any one through hole 101 is located between two adjacent reinforcing parts 105.

[0045] The second detection housing 221 is connected to the first wall portion 201 of the first detection housing 211, and the partition 10 is a part of the first wall portion 201; or, the second detection housing 221 is connected to the second wall portion 202 of the first detection housing 211, and the partition 10 is a part of the second wall portion 202. That is to say, the partition 10 is also an integral structure with the first detection housing 211 and the second detection housing 221.

[0046] See Figure 2 and Figure 3 The gas detection device also includes a waterproof and breathable membrane 4, which covers multiple mating holes 2111. In this embodiment of the invention, the waterproof and breathable membrane 4 covers all the mating holes 2111, reducing the possibility of moisture and dust and other impurities from outside the gas detection device entering the first gas chamber 100, thereby giving the gas detection device better waterproof and dustproof performance. At least a portion of the waterproof and breathable membrane 3 is sandwiched between the first housing part 11 and the first detection unit 21, and at least a portion of the waterproof and breathable membrane 3 is located between the vent hole 14 and the mating hole 211. Of course, in other embodiments, the waterproof and breathable membrane 4 may also cover the vent hole 14. For example, the waterproof and breathable membrane 4 is fixed to the outer surface of the housing 1 by adhesive. The waterproof and breathable membrane 4 may include a waterproof and breathable porous material attached to polyester fiber fabric by a specific process, with a pore size at the nanometer level, thereby providing waterproof, dustproof and breathable functions.

[0047] See Figure 12The gas detection device also includes a base 40, which can be a plastic part with a certain strength and hardness. The material cost is low, and it can be manufactured using low-cost methods such as injection molding. The base 40 includes a support portion 41, which can be a closed annular structure. The support portion 41 has a through groove 401, and at least a portion of the outer shell 1 is installed within the through groove 401. Specifically, at least a portion of the outer shell 1 can be clamped and fixed within the through groove 401 of the support portion 41, or it can be glued to the through groove 401 of the support portion 41.

[0048] See also Figure 12 The support portion 41 includes an annular bottom wall 411 and a fourth peripheral wall 412 extending vertically from the bottom wall 411. The bottom wall 411 and the fourth peripheral wall 412 are disposed around the periphery of the through groove 401. In the embodiment illustrated in the present invention, the support portion 41 includes a clamping boss 413 protruding from the fourth peripheral wall 412 into the through groove 401, so that the clamping boss 413 can clamp the outer shell 1. Specifically, the second shell portion 12 of the outer shell 1 slides over the clamping boss 413 and is installed in the through groove 401, and the clamping boss 413 plays a limiting role. The clamping boss 413 is generally a triangular boss with a larger thickness at the lower end and a smaller thickness at the upper end, thereby facilitating the sliding of the second shell portion 12 of the outer shell 1 downward along the inclined surface of the clamping boss 413, and finally clamping and installing it in the through groove 401. The bottom wall 411 provides axial limitation for the second shell portion 12 of the outer shell 1, and the fourth peripheral wall 412 provides radial limitation for the second shell portion 12 of the outer shell 1.

[0049] like Figure 12 As shown, the base 40 also includes a lug 414, which protrudes outward from the support portion 41. The lug 414 has a mounting hole 4141 for assembly with other components. In the embodiment illustrated in the figures, the lug 414 includes a first lug 415 and a second lug 416, located on two adjacent sides of the support portion 41. Of course, in other embodiments, the first lug 415 and the second lug 416 may also be located on opposite sides of the support portion 41.

[0050] To improve the detection accuracy of the gas detection device, the cylindrical first detection housing 211 needs to maintain a certain length. To achieve the length increase of the first detection housing 211 within a confined space, see [reference needed]. Figure 13In this invention, a first straight line X1 and a second straight line X2 are defined on the second surface 31 of the circuit board 3. The first detection housing 211 has a first projection S1 on the second surface 31 of the circuit board 3, and the first straight line X1 extends along the length direction of the first projection S1. The second straight line X2 extends along the width direction of the circuit board 3, and the first straight line X1 is inclined at an acute angle β relative to the second straight line X2. This is beneficial for expanding the installation space of the first detection unit 21, and correspondingly, it is also beneficial for extending the distance between the light source module 213 and the detection probe 214. Thus, with a longer optical path, the gas can absorb infrared light more fully, which is beneficial for improving the detection accuracy of the gas detection device.

[0051] See Figure 9 The first detection unit 21 also includes a first adapter plate 214 and a second adapter plate 215. Both the first adapter plate 214 and the second adapter plate 215 have a plug-in portion 2141, and the circuit board 3 has plug holes (not shown) corresponding to the two plug-in portions 2141 respectively. The plug-in portion 2141 is at least partially located within the plug hole. The pins of the light source module 212 are soldered to the first adapter plate 214, and the pins of the detection probe 213 are soldered to the second adapter plate 215. Both the first adapter plate 214 and the second adapter plate 215 are soldered to the circuit board 3.

[0052] See Figure 14 The first housing portion 11 has a second projection S2 on the third housing portion 13 along the height direction HH of the gas detection device. A third straight line X3 and a fourth straight line X4 are defined on the outer surface of the third housing portion 13. The third straight line X3 extends along the length direction of the second projection S2. The fourth straight line X4 extends along the width direction WW of the second housing portion 12. The third straight line X3 is inclined at an acute angle α relative to the fourth straight line X4, wherein the angle α and the angle β are equal.

[0053] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A gas detection device, characterized in that, Includes a first detection unit and a second detection unit. The first detection unit includes a gas detection component and a first detection housing. The first detection unit has a first gas chamber. The gas detection component and the first detection housing are both disposed around the first gas chamber. The first detection housing has a mating hole that communicates with the first gas chamber and with the external gas of the gas detection device. The second detection unit includes a pressure detection component and a second detection housing. The second detection unit has a second air chamber, and the second detection housing is disposed around the second air chamber. The pressure detection component is located in the second air chamber. The second gas chamber is in gas communication with the first gas chamber, and the first gas chamber is in gas communication with the outside gas of the gas detection device through the mating hole. The gas detection device includes a partition plate, which is connected to at least one of the first detection housing and the second detection housing. The partition plate is located between the first gas chamber and the second gas chamber. The partition plate is provided with a through hole, which connects the first gas chamber and the second gas chamber. The extension direction of the mating hole is not the same as the extension direction of the through hole.

2. The gas detection device according to claim 1, characterized in that, The partition includes a first surface exposed to the second air chamber, the partition has a groove recessed from the first surface into the partition, and the through hole communicates with the groove.

3. The gas detection device according to claim 2, characterized in that, The partition has an arc-shaped surface, which is the outer surface of the groove.

4. The gas detection device according to claim 1, characterized in that, The first detection housing and the second detection housing are an integral structure, and the second detection housing is located on one side of the width direction of the first detection housing.

5. The gas detection device according to claim 1, characterized in that, The gas detection device includes a housing with an inner cavity, and the first detection unit and the second detection unit are both housed in the inner cavity. The outer casing has a vent hole, which communicates with the mating hole, and the mating hole communicates with the external gas of the gas detection device through the vent hole; The outer casing is a single piece, and at least a portion of the outer casing is attached to at least one of the first detection unit and the second detection unit.

6. The gas detection device according to claim 5, characterized in that, The outer shell includes a first housing portion and a second housing portion, and the inner cavity includes a first inner cavity and a second inner cavity. The first housing portion is located on the periphery of the first inner cavity, and the second housing portion is located on the periphery of the second inner cavity. The mating hole is provided in the first housing portion. The first detection unit is housed in the first inner cavity, at least a portion of the first housing portion is fitted to the first detection unit, and the vent hole is aligned with the mating hole; The second detection unit is housed in the second inner cavity, and at least a portion of the second housing portion is in contact with the second detection unit.

7. The gas detection device according to claim 6, characterized in that, The gas detection device includes a waterproof and breathable membrane that covers the mating hole. At least a portion of the waterproof and breathable membrane is sandwiched between the first housing portion and the first detection unit, and at least a portion of the waterproof and breathable membrane is located between the vent hole and the mating hole.

8. The gas detection device according to claim 5, characterized in that, The gas detection device includes a circuit board, and the first detection unit and the second detection unit are both electrically connected to the circuit board. The circuit board is housed in the inner cavity, and at least a portion of the outer shell is attached to the circuit board.

Images