Gas detection device

Abstract

The gas detection device comprises a shell assembly, a first detection part, a second detection part and a circuit board, the shell assembly comprises a first containing cavity, the first detection part and the second detection part are located in the first containing cavity, the first detection part is electrically connected with the circuit board, and the second detection part is electrically connected with the circuit board. The shell assembly comprises an upper cover part, the upper cover part is located on the side, away from the circuit board, of the first shell, the gas detection device comprises a first sensor, the first sensor is located in the first containing cavity, the first sensor is fixed or limited to the upper cover part, and the first sensor detects the temperature, humidity or humiture of the first containing cavity; the detection value of the first sensor can compensate the detection value of the first detection component and the detection value of the second detection component. The precision of the gas detection device is improved.

Description

Technical Field

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

[0002] In related technologies, a gas sensor includes a housing, a circuit board, a detection probe, and a reference probe. The detection probe includes a first housing and a first sensitive element, which is electrically connected to the circuit board and located inside the first housing. The first housing has a first opening, allowing external gas to flow through the housing and then through the opening to contact the first sensitive element. The reference probe includes a second housing and a second sensitive element, which is located inside the second housing and electrically connected to the circuit board. The inner cavity of the second housing is a closed cavity. When the resistance difference between the first and second sensitive elements reaches a certain value, the gas sensor transmits a signal and issues an alarm. When there are sudden changes in external temperature or humidity, because the reference probe is a closed detection probe, the reference probe and the detection probe are significantly affected by temperature differences, and the detection accuracy of the gas sensor needs further improvement. Summary of the Invention

[0003] A gas detection device is provided, comprising a housing assembly, a first detection component, a second detection component, and a circuit board. The housing assembly includes a first receiving cavity, in which the first and second detection components are located. The first and second detection components are electrically connected to the circuit board. The housing assembly also includes a top cover located on the side of the first housing facing away from the circuit board. The gas detection device includes a first sensor located in the first receiving cavity and fixed or confined to the top cover. The first sensor detects the temperature, humidity, or temperature and humidity of the first receiving cavity. The detection value of the first sensor can compensate for the detection values ​​of the first and second detection components.

[0004] The gas detection device includes a housing assembly, a circuit board, a first detection component, a second detection component, and a first sensor. The housing assembly includes a first receiving cavity and a top cover located on the side of the first detection component opposite to the circuit board. The first sensor is fixed or confined to the top cover. The first sensor detects the temperature and humidity or temperature and humidity of the first receiving cavity. The detection value of the first sensor can compensate for the detection values ​​of the first and second detection components, thereby improving the accuracy of the gas detection device. Attached Figure Description

[0005] Figure 1 A three-dimensional structural schematic diagram of the gas detection device provided by the present invention;

[0006] Figure 2 for Figure 1 A top-view schematic diagram of a gas detection device;

[0007] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0008] Figure 4 for Figure 3 A magnified view of part B in the middle section;

[0009] Figure 5 for Figure 1 A partial structural diagram of the first conductive part of the gas detection device located in the upper cover;

[0010] Figure 6 This is a top view of the first sensor;

[0011] Figure 7 This is a top view of the first extension.

[0012] Figure 8 for Figure 1 A partial structural diagram of the gas detection device;

[0013] Figure 9 for Figure 5 A magnified view of part C in the middle;

[0014] Figure 10 for Figure 3 A magnified view of part D in the middle.

[0015] Figure label:

[0016] The housing assembly 1 includes a first receiving cavity 11, an upper cover 12, an upper cover portion 121, a first mounting portion 122, a first mounting groove 123, an extension portion 124, a first vent hole 125, a plug-in portion 126, a lower cover 13, a main body portion 131, a peripheral wall portion 132, and a second groove 133.

[0017] First detection component 2, first housing 21, first through hole 211, first sensing element 22.

[0018] Second detection component 3, second housing 31, second sensing element 32

[0019] Circuit board 4, fourth conductive part 41,

[0020] First sensor 5, second conductive part 51

[0021] First conductive part 6, third conductive part 7

[0022] First seal 8. Detailed Implementation

[0023] The technical solution of the specific implementation method is described below with reference to the accompanying drawings.

[0024] It should be noted that although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present invention, and 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.

[0025] Refrigerants used in air conditioning systems, such as Freon (R22), can damage the atmospheric ozone layer, potentially leading to ozone holes and allowing direct ultraviolet radiation from the sun to reach the Earth's surface. To protect the ozone layer, current air conditioning systems use R32 (chemically known as difluoromethane, a halogenated hydrocarbon with the chemical formula C₂F₂) as the refrigerant. However, R32 is slightly flammable and can form an explosive mixture with air, posing a risk of combustion and explosion when exposed to heat sources or open flames, thus creating a safety hazard. Therefore, real-time monitoring of the R32 concentration in the air surrounding the refrigerant delivery pipes of air conditioning systems is one way to eliminate this safety hazard.

[0026] Gas detection devices are used to detect and alarm on the concentration of gases in the surrounding environment. The collected gas concentration signals are transmitted to the processing unit of the gas detection device or the processing unit of the air conditioning system, etc., for processing. The gas detection device and the air conditioning system will then take corresponding countermeasures, such as taking alarm actions, to ensure the safe use of the air conditioning system.

[0027] refer to Figures 1-4 A gas detection device includes a housing assembly 1, a first detection component 2, a second detection component 3, and a circuit board 4. The housing assembly 1 includes a first receiving cavity 11, with the first detection component 2 and the second detection component 3 located in the first receiving cavity 11. The first detection component 2 is electrically connected to the circuit board 4, and the second detection component 3 is also electrically connected to the circuit board 4. The housing assembly 1 includes a top cover 121, located on the side of the first detection component 2 opposite to the circuit board 4. The gas detection device includes a first sensor 5, located in the first receiving cavity 11 and fixed or confined to the top cover 121. The first sensor 5 detects the temperature, humidity, or temperature and humidity of the first receiving cavity 11. The detection value of the first sensor 5 can compensate for the detection values ​​of the first detection component 2 and the second detection component 3.

[0028] The gas detection device includes a housing assembly 1, a circuit board 4, a first detection component 2, a second detection component 3, and a first sensor 5. The housing assembly 1 includes a first receiving cavity 11 and a top cover 121. The top cover 121 is located on the side of the first detection component 2 opposite to the circuit board 4. The first sensor 5 is fixed or confined to the top cover 121. The first sensor 5 detects the temperature, humidity, or temperature and humidity of the first receiving cavity 11. The detection value of the first sensor 5 can compensate for the detection value of the first detection component 2 and the detection value of the second detection component 3, thereby improving the accuracy of the gas detection device.

[0029] The first sensor 5 can be a temperature sensor, a humidity sensor, or a temperature and humidity sensor, etc., which will not be elaborated here.

[0030] The gas detection device acquires the gas concentration signal of the current environment through the first detection component 2. The gas concentration signal can then be processed by a conversion circuit, an amplification and filtering circuit, and an analog-to-digital conversion circuit to finally obtain the gas concentration detection value, which will not be elaborated here.

[0031] refer to Figures 3-4 The top cover 121 includes a first mounting portion 122, which has a first mounting groove 123. The first mounting groove 123 is recessed in the wall of the first mounting portion 122 facing the circuit board 4. The first sensor 5 is located in the first mounting groove 123. The first sensor 5 is interference-fitted with the first mounting groove 123 or bonded to the corresponding groove wall of the first mounting groove 123. This facilitates the assembly of the first sensor 5, eliminates the need for an additional bracket to fix the first sensor 5, reduces assembly errors caused by the bracket fixing the first sensor 5 and the housing assembly 1, and improves the installation accuracy of the first sensor 5 and the accuracy of the gas detection device.

[0032] The housing assembly 1 includes an upper cover 12 and a lower cover 13. The upper cover 12 includes an upper cover 121, and the lower cover 13 includes a main body portion 131 and a peripheral wall portion 132. The peripheral wall portion 132 protrudes from the main body portion 131, and the circuit board 4 is confined within the main body portion 131. The lower cover 13 has a second groove 133, which is recessed at the end of the peripheral wall portion 132 away from the main body portion 131. The upper cover 12 has a plug portion 126, which is at least partially located in the second groove 133. The gas detection device includes a first seal 8, which is located in the second groove 133. The first seal 8 is located between the plug portion 126 and the bottom wall of the second groove 133, thereby improving the accuracy of the fit between the upper cover 12 and the lower cover 13, thus improving the positional accuracy between the first sensor 5, the first detection component 2, and the second detection component 3, and improving the accuracy of the gas detection device.

[0033] refer to Figures 4-6The gas detection device includes a first conductive part 6, which is electrically connected to the circuit board 4. The first conductive part 6 is located on the side wall corresponding to the first groove or the bottom wall of the first groove. The first sensor 5 includes a second conductive part 51, which is located on the side wall or top wall of the first sensor 5. The first conductive part 6 and the second conductive part 51 are electrically connected to facilitate the electrical connection between the first sensor 5 and the circuit board 4.

[0034] For example, both the first conductive part 6 and the second conductive part 51 are contacts, which facilitates the installation of the first sensor 5, saves installation space, and reduces the size of the gas detection device.

[0035] To facilitate the electrical connection between the first sensor 5 and the circuit board 4, refer to Figure 3 , Figures 7-9 The housing assembly 1 includes an extension 124 that protrudes from the top cover 121 toward the circuit board 4. The extension 124 and the top cover 121 are integral, reducing assembly steps and improving the positional accuracy of the first sensor 5. The gas detection device includes a third conductive part 7 located at the end of the extension 124 away from the top cover 121. The third conductive part 7 is electrically connected to the first conductive part 6. The circuit board 4 includes a fourth conductive part 41. The third conductive part 7 and the fourth conductive part 41 are opposite to each other and abut against each other, so that the first sensor 5 is electrically connected to the circuit board 4.

[0036] refer to Figure 3 While the extension 124 abuts against the third conductive part 7 and the fourth conductive part 41, it can also apply a certain downward pressure to the circuit board 4, thereby improving the reliability of the circuit board 4 installation.

[0037] The gas detection device includes a first conductive wire (not shown in the figure). The first conductive wire is integrally injection molded with the upper cover 12 as an insert. One end of the first wire is connected to the first conductive part 6, and the other end of the first wire is connected to the third conductive part 7. The structure is compact and has high safety.

[0038] refer to Figure 3 and Figure 8 The first detection component 2 includes a first housing 21, which has a first through hole 211 located at the top of the first housing 21. In the thickness direction of the device, the first sensor 5 at least partially overlaps with the first through hole 211. The distance between the first sensor 5 and the first housing 21 can be set according to specific requirements, which will not be elaborated here.

[0039] refer to Figure 3 and Figure 8The first detection component 2 includes a first sensitive element 22, which is located inside the first housing 21 and is electrically connected to the circuit board 4. In the thickness direction of the device, the first sensitive element 22 at least partially overlaps with the first through hole 211. The second detection component 3 includes a second housing 31 and a second sensitive element 32, which is located inside the second housing 31 and is electrically connected to the circuit board 4. The top and side walls of the second housing 31 are closed structures, and a medium is sealed inside the second housing 31.

[0040] The first sensitive element 22 is an NTC sensitive element chip, etc., and the second sensitive element 32 is an NTC sensitive element chip, etc., which will not be described in detail here.

[0041] The second detection component 3 constitutes a comparison detection component. When the resistance difference between the first sensitive element 22 and the second sensitive element 32 reaches a certain value, the gas sensor responds.

[0042] In order to allow gas to enter while blocking impurities such as water and dust, thereby protecting the detection components, the gas detection device includes a waterproof and breathable membrane (not shown in the figure). The waterproof and breathable membrane is located on the side of the upper cover 121 away from the circuit board 4, or the waterproof and breathable membrane is integrally formed with the upper cover 121 as an insert to improve the reliability of the installation of the waterproof and breathable membrane. The waterproof and breathable membrane is located on the side of the first sensor 5 away from the circuit board 4.

[0043] refer to Figure 2 The upper cover 12 has a first vent 125. The first vent 125 penetrates the upper cover 121 in the thickness direction. There are multiple first vents 125. The multiple first vents 125 are arranged along the outer periphery of the first mounting part 122. A waterproof and breathable membrane covers the first vents 125.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas detection device, characterized by, The gas detection device comprises a shell assembly (1), a first detection component (2), a second detection component (3) and a circuit board (4), the shell assembly (1) comprises a first accommodating cavity (11), the first detection component (2) and the second detection component (3) are located in the first accommodating cavity (11), the first detection component (2) is electrically connected with the circuit board (4), the second detection component (3) is electrically connected with the circuit board (4), the shell assembly (1) comprises an upper cover portion (121), the upper cover portion (121) is located on the side of the first detection component (2) away from the circuit board (4), the gas detection device comprises a first sensor (5), the first sensor (5) is located in the first accommodating cavity (11), the first sensor (5) is fixed or limited in the upper cover portion (121), the first sensor (5) detects the temperature, humidity or temperature and humidity of the first accommodating cavity (11), and the detection value of the first sensor (5) can compensate the detection value of the first detection component (2) and the detection value of the second detection component (3).

2. The gas detection apparatus according to claim 1, wherein The upper cover portion (121) comprises a first mounting portion (122), the first mounting portion (122) has a first mounting groove (123), the first mounting groove (123) is recessed in the wall portion of the first mounting portion (122) facing the circuit board (4), and the first sensor (5) is located in the first mounting groove (123).

3. The gas detection apparatus of claim 2, wherein The gas detection device comprises a first conductive portion (6), the first conductive portion (6) is electrically connected with the circuit board (4), the first conductive portion (6) is located on the side wall corresponding to the first recess or the groove bottom wall of the first recess, the first sensor (5) comprises a second conductive portion (51), the second conductive portion (51) is located on the side wall or the top wall of the first sensor (5), and the first conductive portion (6) is electrically connected with the second conductive portion (51).

4. The gas detection apparatus according to claim 3, wherein The shell assembly (1) comprises an upper cover (12), the upper cover (12) comprises an upper cover portion (121) and an extension portion (124), the extension portion (124) protrudes from the upper cover portion (121) towards the circuit board (4), the gas detection device comprises a third conductive portion (7), the third conductive portion (7) is located on the end portion of the extension portion (124) away from the upper cover portion (121), the third conductive portion (7) is electrically connected with the first conductive portion (6), the circuit board (4) comprises a fourth conductive portion (41), the third conductive portion (7) is opposite to the fourth conductive portion (41), and the third conductive portion (7) abuts against the fourth conductive portion (41).

5. The gas detection apparatus of claim 4, wherein The gas detection device comprises a first conductive wire, the first conductive wire is integrally injection molded with the upper cover (12) as an insert, one end of the first conductive wire is connected with the first conductive portion (6), and the other end of the first conductive wire is connected with the third conductive portion (7).

6. A gas detection device according to any one of claims 2 to 5, characterised in that, The first detection component (2) comprises the first shell (21), the first shell (21) has a first through hole (211), the first through hole (211) is located at the top of the first shell (21), the first sensor (5) at least partially coincides with the first through hole (211) in the thickness direction of the device, the first sensor (5) is a temperature sensor, a humidity sensor or a temperature and humidity sensor.

7. The gas detection apparatus of claim 6, wherein The gas detection device comprises a waterproof and breathable film, the waterproof and breathable film is located on the side of the upper cover part (121) away from the circuit board (4), or the waterproof and breathable film is integrally formed with the upper cover part (121) as an insert, and the waterproof and breathable film is located on the side of the first sensor (5) away from the circuit board (4).

8. The gas detection apparatus of claim 7, wherein The upper cover (12) has a first breathable hole (125), the first breathable hole (125) penetrates the upper cover part (121) in the thickness direction of the upper cover part (121), the number of the first breathable hole (125) is multiple, and multiple first breathable holes (125) are arranged along the outer periphery of the first mounting part (122), and the waterproof and breathable film covers the first breathable hole (125).

9. A gas detection device according to claim 7 or 8, characterised in that, The first detection component (2) comprises a first sensitive element (22), the first sensitive element (22) is located in the first shell (21), and the first sensitive element (22) at least partially coincides with the first through hole (211) in the thickness direction of the gas detection device; the second detection component (3) comprises a second shell (31) and a second sensitive element (32), the second sensitive element (32) is located in the second shell (31), and the top wall and the side wall of the second shell (31) are in a closed structure.

10. The gas detection apparatus according to claim 4 or 5, wherein The shell assembly (1) comprises a lower cover (13), the lower cover (13) comprises a main body part (131) and a peripheral wall part (132), the peripheral wall part (132) protrudes from the main body part (131), the circuit board (4) is limited in the main body part (131), the lower cover (13) has a second groove (133), the second groove (133) is recessed in the end of the peripheral wall part (132) away from the main body part (131), the upper cover (12) has a plug-in part (126), the plug-in part (126) is at least partially located in the second groove (133), the gas detection device comprises a first sealing element (8), the first sealing element (8) is located in the second groove (133), and the first sealing element (8) is located between the plug-in part (126) and the groove bottom wall of the second groove (133).

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