Gas detection device

Abstract

The embodiment of the invention provides a gas detection device. The gas detection device comprises an electric appliance assembly, the electric appliance assembly at least comprises a first circuit board, a second circuit board, an inductive probe and a sensor; the inductive probe is electrically connected with the first circuit board; the sensor is arranged on the second circuit board, and the sensor is electrically connected with the first circuit board at least through the second circuit board; the inductive probe is provided with a vent hole; in the longitudinal direction of the inductive probe, the second circuit board is closer to the vent hole than the first circuit board. The scheme is beneficial to improving the gas detection precision.

Description

Technical Field

[0001] This application relates to the field of detectors, and particularly to a gas detection device. Background Art

[0002] In order to measure gases, gas sensors are often provided. A gas sensor generally includes an electrical part and a structural part. The electrical part is used for gas sensing and generates corresponding gas information based on at least one gas parameter (such as concentration, mass, thermal conductivity, etc.). During gas detection, it is necessary to ensure the detection accuracy. In addition, the structural part needs to be waterproof as much as possible to protect the electrical part. Especially for refrigerant gas sensors, because their use environments are variable and prone to condensate, their waterproof performance requirements are higher. Summary of the Invention

[0003] The embodiments of this application provide a gas detection device, which is beneficial to improving the gas detection accuracy.

[0004] The gas detection device provided by this application adopts the following technical solutions:

[0005] A gas detection device includes an electrical component; the electrical component at least includes a first circuit board, a second circuit board, a sensing probe and a sensor;

[0006] The sensing probe is electrically connected to the first circuit board; the sensor is disposed on the second circuit board, and the sensor is electrically connected to the first circuit board at least through the second circuit board; the sensing probe is provided with a vent hole; in the longitudinal direction of the sensing probe, the second circuit board is closer to the vent hole than the first circuit board.

[0007] The gas detection device provided by the embodiments of this application includes a first circuit board, a second circuit board, a sensing probe and a sensor, and in the longitudinal direction of the sensing probe, the second circuit board is closer to the vent hole of the sensing probe than the first circuit board. Disposing the sensor on the second circuit board enables the sensor to be closer to the vent hole, which is beneficial to improving the gas detection accuracy. Brief Description of the Drawings

[0008] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0009] Figure 1 Is an exploded view of the electrical component in an embodiment;

[0010] Figure 2 Is a schematic structural diagram after the electrical component, the first bracket, the second bracket, etc. are assembled;

[0011] Figure 3 IsFigure 2 Exploded view;

[0012] Figure 4 Schematic structural view of the second bracket in an embodiment;

[0013] Figure 5 Cross-sectional view of the gas detection device provided in an embodiment of the present application;

[0014] Figure 6 Cross-sectional view of the gas detection device provided in another embodiment of the present application;

[0015] Figure 7 is Figure 5 exploded view of the gas detection device shown;

[0016] Figure 8 Schematic structural view of the gas detection device provided in an embodiment of the present application;

[0017] Figure 9 Schematic structural view of the second housing part in an embodiment;

[0018] Figure 10 Schematic structural view of the first seal in an embodiment;

[0019] Figure 11 Schematic structural view of the first housing part in an embodiment;

[0020] Figure 12 is Figure 9 local enlarged view at A in;

[0021] Figure 13 Schematic structural view of the third seal in an embodiment;

[0022] Figure 14 Schematic structural view of the gas detection device provided in another embodiment;

[0023] Figure 15 Top view of the gas detection device in an embodiment;

[0024] Figure 16 Side view of the gas detection device in an embodiment.

[0025] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0026] Description of reference numerals: 11, electrical component; 111, first circuit board; 1111, connecting wire; 112, second circuit board; 113, induction probe; 1130, reference probe; 1131, ventilation hole; 114, sensor; 115, breathable membrane; 116, first bracket; 1161, pin; 1162, first bracket through hole; 1163, second bracket through hole; 117, second bracket; 1170, bracket body; 1171, first buckle; 1172, second buckle; 1173, bracket support part; 1174, through hole; 118, pin header; 12, housing; 121, first housing part; 122, second housing part; 123, water blocking rib; 124, partition part; 125, water guiding surface; 1201, installation cavity; 1202, detection air chamber; 1203, communication through hole; 012, induction component; 011, processing component; 1211, boss; 1212, crimping rib; 1213, wire pressing mechanism; 1214, cushion block; 1221, body part; 12211, bottom of body part; 12212: peripheral wall part; 1222, protruding part; 1223, protruding rib; 1224, first groove; 1225, second groove; 1226, housing support part; 1227, wire trough; 1228, waterproof groove; 1229, waterproof strip; 12210, wire clamping fin; 13, first seal; 131, inner part; 132, outer part; 133, connecting part; 14, second seal; 15, third seal; 16, waterproof breathable membrane Detailed implementation manners

[0027] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims

[0028] Next, the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail with specific embodiments. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. In addition, the descriptions of orientations such as up, down, top, and bottom are for specific drawings and do not represent absolute orientations. Planes, angles, verticality, etc. represent approximate positional relationships in engineering and do not represent absolute positions in a mathematical sense. Next, the embodiments of the present application will be described with reference to the drawings

[0029] A gas detection device, as Figure 1As shown, it includes an electrical component 11; the electrical component 11 at least includes a first circuit board 111, a second circuit board 112, a sensing probe 113, and a sensor 114; the sensing probe 113 is used for gas detection; and the sensor 114 is used for data compensation to improve the gas detection accuracy. Specifically, the sensor 114 can be a temperature sensor, a humidity sensor, or a temperature and humidity sensor.

[0030] The sensing probe 113 is electrically connected to the first circuit board 111; the sensor 114 is disposed on the second circuit board 112, and the sensor 114 is at least electrically connected to the first circuit board 111 through the second circuit board 112; the sensing probe 113 is provided with a ventilation hole 1131; in the longitudinal direction of the sensing probe 113 (such as Figure 1 the d1 direction shown), the second circuit board 112 is closer to the ventilation hole 1131 than the first circuit board 111.

[0031] Among them, the sensing probe 113 is used to sense the gas and can detect the gas concentration; specifically, the measured gas diffuses into the sensing probe 113 through the ventilation hole 1131 to be sensed by the sensing device 1132 inside the sensing probe 113. And the sensor is used to compensate the detection data or the process data during detection, reduce the influence of other parameters on the detection result, and thus improve the detection accuracy; commonly, temperature or humidity is needed to compensate the gas detection process. In this embodiment, by setting the sensor 114 for measuring compensation parameters on the second circuit board 112, the sensor 114 is closer to the ventilation hole 1131, so that the compensation parameters are closer to the real environment of the measured gas, such as the real temperature and humidity of the measured gas, which is beneficial to improving the detection accuracy. Compared with directly setting the sensor 114 on the first circuit board 111, the detection accuracy of this embodiment can be improved to a certain extent.

[0032] When the gas detection device is used for refrigerant detection in a temperature regulation system (such as an air conditioner, a heat pump, etc.), temperature and humidity are needed to compensate the detection data, and the sensor 14 is set as a temperature and humidity sensor; the gas detection device further includes a breathable membrane 115, and the breathable membrane 115 is located on the sensing probe 113 and covers the ventilation hole 1131; the aperture of the breathable membrane is larger than the structure of the refrigerant gas molecules, so that the refrigerant gas can diffuse into the sensing probe 113.

[0033] In one embodiment, as Figure 2As shown in the figure, the second circuit board is provided with a first through-hole 1121; the induction probe 113 is welded to the first circuit board 111; at least a part of the induction probe 113 is located above the first through-hole 1121. In this embodiment, the induction probe 113 is a device with a plug-in package, welded to the corresponding pad on the first circuit board 111. The ventilation hole 1131 is located above the first circuit board, and the second circuit board is also located above the first circuit board. Through the design of the second circuit board, the temperature and humidity sensor 114 is made as close as possible to the ventilation hole 1131, so that the temperature and humidity are as close as possible to the true temperature and humidity of the measured gas.

[0034] Further, as Figure 2 shown in the figure, define the distance between the upper surface of the induction probe 113 and the upper surface of the second circuit board 112 as h1, and define the height of the temperature and humidity sensor 114 as h2. In one embodiment, set the absolute value of the difference between h1 and h2 to be less than or equal to 5 millimeters, so that the sensing component of the sensor 114 is as close as possible to the plane where the ventilation hole 1131 is located, to reduce the distance between the two, and make the temperature and humidity as close as possible to the true temperature and humidity of the measured gas.

[0035] In one embodiment, as Figure 2 or Figure 3 shown in the figure, a first bracket 116 is provided; the first bracket 116 is a conductor; the outer shell of the induction probe 113 is a conductor; the outer shell of the induction detection 113 contacts the first bracket 116; the first bracket includes a bracket pin 1161; the bracket pin 1161 is electrically connected to the reference ground terminal of the first circuit board 111. In this embodiment, the grounding of the induction probe 113 is achieved by setting the first bracket, which is beneficial to improving the anti-interference ability and further improving the detection accuracy.

[0036] Further, in order to achieve gas detection, a reference probe 1130 is also provided; the inner cavity of the reference probe 1130 is a sealed structure, and an induction device is also provided inside and a reference gas is sealed inside; the second circuit board is provided with a second through-hole 1122; the first bracket is provided with a first bracket through-hole 1162 and a second bracket through-hole 1163; the induction probe 113 is sleeved in the first bracket through-hole 1162, and the reference probe 1130 is sleeved in the second bracket through-hole 1163. The reference probe also contacts the first bracket, so as to achieve electrical connection with the reference ground. In this embodiment, at least the induction devices inside the induction probe and the reference probe are used to form a Wheatstone bridge, and then the gas detection is carried out by using the Wheatstone bridge method; the induction device can be a thermistor, such as an NTC resistor.

[0037] Further, in order to fix the second circuit board, in one embodiment, the gas detection device is further provided with a second bracket 117; at least a part of the second bracket 117 is located between the first bracket 116 and the first circuit board 111 to lift the second circuit board so that its height is close to the ventilation hole 1131, thereby making the sensor 114 thereon close to the ventilation hole 1131. The second bracket is further set as a non-heat-conducting body to prevent heat from spreading from the reference probe 1130 or the induction probe 113 to the first circuit board 111 and reducing the detection accuracy; making the second bracket into a plastic part or a rubber part is particularly suitable for a gas detection device based on the heat conduction principle.

[0038] As Figure 4 shown, in one embodiment, the second bracket 117 includes a bracket support portion 1173; as Figure 2 shown, the bracket support portion 1173 abuts against the lower surface of the second circuit board 112 to lift the second circuit board 112.

[0039] As Figure 2 or Figure 4 shown, the second bracket 117 further includes a bracket body 1170 and a first buckle 1171. The first buckle 1171 is snapped onto the first bracket 116 so that the first bracket 116 is limited and arranged between the snap surface of the first buckle 1171 and the bracket body 1170. The second bracket 117 further includes a second buckle 1172; the second buckle 1172 is snapped onto the second circuit board 112, and the second circuit board 112 is limited and arranged between the snap surface of the second buckle 1172 and the bracket support portion 1173, thereby realizing the fixation and elevation of the second circuit board 112. Specifically, the first buckle and the second buckle can be in an inverted L shape.

[0040] To improve the stability, the number of the bracket support portions is set to be greater than or equal to 2, and the number of the first buckles is greater than or equal to 2. To realize the electrical connection between the first circuit board and the second circuit board, as Figure 3 shown, the gas detection device further includes a pin header 118. One end of the pin header 118 is electrically connected to the second circuit board, and the other end is electrically connected to the first circuit board to send the compensation parameters detected by the sensor to the first circuit board for signal processing, realizing high-precision gas detection.

[0041] To realize the welding of the induction probe and / or the reference probe to the first circuit board 111, as Figure 4 shown, the second bracket 117 is further provided with a mounting through hole 1174. The pins of the induction probe 113 pass through the mounting through hole 1174 and are welded to the first circuit board 111; the pins of the reference probe 1130 pass through the mounting through hole 1174 and are welded to the first circuit board 111. Figure 4The size of the mounting through hole is larger than the package size of the sensing probe and / or reference probe. Of course, a smaller through hole can also be provided so that the pins of the sensing probe and / or reference probe can pass through and be soldered to the first circuit board 111.

[0042] In the above embodiment, further, in order to install the electrical component 11, as shown in FIG. Figure 5 As shown, the gas detection device also includes a shell 12; the internal space of the shell 12 includes a detection chamber 1202 and an installation cavity 1201; the detection chamber is provided with a connecting hole 1203 connected to the outside world, and the sensing probe 113 and the second circuit board 112 are located in the detection chamber 1202, and can contact the gas to be measured that enters the detection chamber 1202 through the connecting hole 1203 to perform gas parameter detection; the first circuit board 111 is located in the installation cavity 1201, and the detection chamber 1202 and the installation cavity 1201 are relatively airtightly isolated, which can effectively prevent water vapor or contaminated gas in the detection chamber from entering the installation cavity and causing damage to the electronic devices in the installation cavity, thereby helping to improve the life of the device. Furthermore, the gas detection device also includes a waterproof and breathable membrane, which is attached to the shell 12 and covers the connecting hole 1203, so that the gas to be measured can diffuse into the detection chamber, while trying to prevent water from flowing into the detection chamber, thereby improving the detection accuracy, and can effectively prevent device damage caused by water, which is also conducive to improving the life of the device.

[0043] When the above-mentioned gas detection device is used in an environment where condensation water or high humidity is easily generated, it is particularly necessary to prevent condensation water or humidity from damaging the device. Refrigerant leakage may occur during the use of air conditioners or heat pumps. New refrigerants (such as R32, R290, etc.) are flammable and toxic, and there is a greater risk. In order to be able to identify such leakage risks in a timely manner, the gas detection device of the above-mentioned embodiment can be set to detect refrigerant leakage in real time. The gas detection device is installed near the evaporator of the air conditioner or heat pump indoor unit; when the humidity is high and the evaporator temperature is low, if the gas detection device is not properly sealed, condensation water will easily be generated inside the device due to the temperature difference. The condensation water generated inside will damage the life of electronic components, and in severe cases, it will damage the use of the product. Although the connecting through-holes of the gas detection device are covered with a waterproof and breathable membrane, it is inevitable that some moisture will pass through the breathable membrane and enter the detection air chamber.

[0044] In order to reduce the damage of moisture or condensation to the gas detection device, the embodiment of the present application also provides a gas detection device, such as Figure 6As shown in the figure, it includes a sensing component 012, a processing component 011 and a housing 12; the internal space of the housing 12 includes a detection gas chamber 1202 and an installation cavity 1201; the detection gas chamber and the installation cavity are relatively airtight and isolated; the housing 12 is provided with a communication through-hole 1203, and the communication through-hole 1203 is connected to the detection gas chamber 1202; the sensing component 012 is located in the detection gas chamber 1202 and can detect the measured gas diffused into the detection gas chamber 1202 through the communication through-hole 1203; the processing component 011 is located in the installation cavity 1201; the sensing component and the processing component are electrically connected, and the processing component calculates gas parameters (such as gas concentration) according to the parameter information sensed by the sensing component. The detection gas chamber 1202 and the installation cavity 1201 are relatively airtight and isolated, which can effectively prevent the water vapor or polluted gas in the detection gas chamber from entering the installation cavity and damaging the electronic devices in the installation cavity, thus being beneficial to improving the device life. The relative airtight isolation can be achieved by setting structural forms such as sealant and sealing ring, so that as little gas as possible enters the installation cavity.

[0045] For the convenience of description, the electrical components 11 of the gas detection device are divided into a sensing component 012 and a processing component 011; the sensing component 012 is mainly used for gas detection, such as including a sensing probe 113; while the processing component 011 mainly includes a control chip, a power circuit, a communication circuit or other processing circuits, and is used to process the electrical signals detected by the sensing component to obtain corresponding gas parameters (such as gas concentration).

[0046] Among them, in Figures 1 - 5 the shown embodiment, the sensing component 012 includes a sensing probe 113, a sensor 114 and a second circuit board 112; the processing component 011 includes a first circuit board 111; of course, the sensing component and the processing component also include other electronic components for realizing corresponding functions.

[0047] In one embodiment, referring to Figure 7 , the housing 12 includes a first housing part 121 and a second housing part 122; the first housing part 121 and the second housing part 122 can be fixedly installed with each other in forms such as screws and snap seals. As Figure 8 or Figure 9 shown, the second housing part 122 includes a main body part 1221 and a protruding part 1222; the detection gas chamber 1202 is at least formed by surrounding the protruding part 1222; the protruding part 1222 is provided with a communication through-hole 1203, and the communication through-hole 1203 connects the detection gas chamber 1202 and the external space;

[0048] On one side of the main body part 1221 away from the convex part 1222, a first limiting part is provided; the gas detection device further includes a first seal; the first seal is installed in a limiting manner with the first limiting part; the first seal is in contact with the circuit board of the processing component 011. In this embodiment, the convex part, the first seal and a part of the circuit board of the processing component form a detection gas chamber. At the same time, the first seal can prevent moisture or gas from entering the installation cavity from the detection gas chamber. The electronic devices of the processing component are preferably arranged on the circuit board other than the circuit board component forming the detection gas chamber, which is beneficial to reducing the influence of moisture or polluted gas on the device and improving the accuracy and lifespan.

[0049] The first limiting part can be a structure such as a slotted groove / raised rib, etc. The first seal can be a structure with a sealing function such as a sealant, a sealing ring, etc. The first seal is arranged on the first limiting part to reduce the material exchange between the detection gas chamber and the installation cavity. Figure 7 or Figure 9 For example, the first limiting part includes a raised rib 1223; the first seal is a first sealing ring 13. One side of the first sealing ring 13 has an opening. The first sealing ring is installed in a limiting manner on the raised rib 1223 through the opening; the side of the first sealing ring away from the opening abuts against the circuit board of the processing component. The first sealing ring is sleeved on the raised rib and abuts against the circuit board of the processing component to form a detection gas chamber that is hermetically isolated from the installation cavity.

[0050] Furthermore, in order to strengthen the airtightness between the detection gas chamber and the installation cavity, in one embodiment, as Figure 9 shown, a first groove 1224 is provided on the outer periphery of the raised rib 1223. The cross-section of the first sealing ring 13 is U-shaped; the first sealing ring 13 is sleeved on the raised rib 1223; at least part of the inner side part 131 of the first sealing ring 13 is located in the detection gas chamber 1202, and at least part of the outer side part 132 of the first sealing ring 13 is located in the first groove 1224; the connecting part between the inner side part and the outer side part of the first sealing ring 13 abuts against the circuit board of the processing component.

[0051] In a specific embodiment, the circuit board of the processing component that abuts against the first seal / the first sealing ring can be the first circuit board 111, that is, the first seal is in contact / abut against the first circuit board 111; at this time, the detection gas chamber is at least formed by the convex part 1222 and part of the first circuit board 111, and the installation cavity is at least formed by the main body part 1221 and the first housing part 121. As Figures 6 - 10 shown, the detection gas chamber and the installation cavity are separated by the raised rib 1223, the first groove 1224, the first sealing ring 13 and part of the first circuit board 111 to form a hermetic isolation. Except for one side of the first circuit board 111 within the circle where the first sealing ring 13 abuts, which is located in the detection gas chamber, other processing components are all located in the installation cavity 1201.

[0052] Furthermore, as Figure 9As shown, the body part 1221 includes a bottom part 12211 and a peripheral wall part 12212; the peripheral wall part 12212 is provided at the edge of the bottom part 12211; a second groove 1225 is provided on the side of the peripheral wall part 12212 facing away from the bottom part 12211; the gas detection device further includes a second seal; the second seal 14 is located in the second groove 1225. As Figure 11 As shown, a boss 1211 is provided inside the first housing part 121, and the boss 1211 is fitted and installed with the second groove 1225; after assembly, the second seal is fully filled between the boss 1211 and the second groove 1225, effectively preventing external moisture or water from entering the interior of the housing. The second seal may be a sealing structure such as a sealant or a sealing ring.

[0053] Furthermore, as Figure 9 As shown, the second housing part 122 is further provided with a housing support part 1226; the housing support part 1226 is provided on the side of the bottom part 12211 facing away from the detection gas chamber 1202 for supporting the first circuit board 111. Figure 11 As shown, buckling ribs 1212 are provided inside the first housing part 121; the buckling ribs 1212 correspond to the protruding ribs 1223 of the second housing part 122, and at least part of the first seal ring 13 is located between the buckling ribs 1212 and the protruding ribs 1223. In this embodiment, after the gas detection device is assembled, the buckling ribs 1212 tightly press one side of the first circuit board 111, so that the other side of the first circuit board 111 is fully abutted against the first seal ring 13. Under the action of the reaction force of the protruding ribs 1223, the first seal ring undergoes elastic deformation, fully achieving the sealing effect.

[0054] Furthermore, as Figures 7 - 13 As shown, in order to achieve electrical connection with an external device, the first circuit board 111 is further provided with a connecting wire 1111; the second housing part 122 is provided with a wire trough 1227; the first housing part 121 is provided with a wire pressing mechanism 1213; the gas detection device further includes a third seal 15. Figure 13As shown, the third seal 15 is provided with a wire passing hole 1501, and the connecting wire 1111 passes through the wire passing hole 1501; the hole wall of the wire passing hole 1501 is provided with a first waterproof wall 151, a second waterproof wall 152 and a third waterproof wall 153. During assembly, first, the third seal is sleeved on the connecting wire, then the connecting wire is welded to the first circuit board 111 to form a processing component 011, and then the processing component is installed into the installation cavity. Part of the connecting wire is located outside the housing, so a wire passing groove 1227 needs to be opened. In order to prevent moisture or humidity from entering the installation cavity from the wire passing groove 1227, a third seal and a corresponding waterproof structure are provided. After assembly, the third waterproof wall 153 is located outside the housing; the second waterproof wall 152 is provided with a sealing groove 1520 corresponding to the second groove 1225. The second seal 14 is a second sealing ring. The third seal and the wire passing groove structure are designed to correspond to each other. After the third seal 15 is installed into the wire passing groove 1227, the second groove and the sealing groove are flush and form a closed groove, which can accommodate part of the second sealing ring, that is, part of the second sealing ring 14 is located in the second groove 1225 and the sealing groove 1520. The second sealing ring 14 abuts against the boss 1211. Under the interaction of the second groove 1225, the sealing groove 1520 and the boss 1211, the second sealing ring 14 is deformed, which is beneficial to prevent moisture or humidity from entering the installation cavity. As Figure 12 shown, the second housing part is further provided with a waterproof groove 1228. The waterproof groove 1228 is located outside the wire passing groove 1227. The first waterproof wall is installed in the waterproof groove 1228 in a limited way to enhance waterproofing. A raised waterproof strip 1229 is provided on the groove wall of the waterproof groove and / or the groove wall of the wire passing groove. The third seal 15 can also be made of rubber material. Under the action of the raised waterproof strip 1229, it can be further deformed to enhance waterproofing; in order to fully squeeze the third seal to fully waterproof, the wire pressing mechanism 1213 includes two relatively arranged wire pressing plates. The second waterproof wall 152 is located between the two relatively arranged wire pressing plates. The wire pressing plates pass through the gap between the second waterproof wall 152 and the first waterproof wall 151 and the gap between the second waterproof wall 152 and the third waterproof wall 153 to fully press the third seal into the wire passing groove 1227, and the third seal is fully deformed to improve the waterproof performance.

[0055] Further, referring to Figure 12, the slot wall of the wire trough 1227 is provided with wire clamping fins 12210, and the wire clamping fins 12210 are in contact with the connecting wire 1111; there are multiple groups of wire clamping fins 12210, each group of wire clamping fins 12210 includes two wire clamping fins, each group of wire clamping fins 12210 is arranged in a V-shaped pattern, and multiple groups of wire clamping fins 12210 are arranged along the extending direction of the wire trough 1227. The setting of the wire trough 1227 can be used to accommodate the connecting wire 1111. On the one hand, the wire clamping fins 12210 in the wire trough 1227 can clamp the connecting wire; on the other hand, multiple groups of V-shaped arranged wire bundling fins can form multiple layers of water blocking structures in the wire trough, thereby improving the waterproof performance of the gas detection device.

[0056] Further, in order to prevent moisture from entering the detection gas chamber, as Figure 7 shown, the gas detection device further includes a waterproof breathable membrane 16; the waterproof breathable membrane 16 is attached to the housing 12 and covers the communication through hole 1203; Figure 7 In, the waterproof breathable membrane 16 is attached to the inner side of the top of the convex part 1222 and covers the communication through hole 1203 provided at the top. In order to fully achieve waterproofing, when the first seal, the second seal and the third seal are all made of rubber sealing material, the hardness of the first seal can be set to 40±10, the compression amount is 12%-30%, and when installed on the upper convex rib 1223, it is squeezed by the first circuit board 111 to form a relatively sealed detection gas chamber, which is beneficial to reducing the moisture entering the installation cavity through the breathable membrane into the detection gas chamber. The cross-section of the second seal is circular, the hardness is 48±10, the compression amount is 15%-35%, and it is installed in the second groove 1225 and the sealing groove 1520, and is squeezed by the boss 1211 to ensure the sealing effect of the housing, and can achieve an IPX4 waterproof effect and isolate the entry of external moisture into the installation cavity. The hardness of the third seal is 52±10. When installed, it is first sleeved on the connecting wire 1111, and then placed in the corresponding wire trough 1227, and is squeezed by the wire trough wall of the second housing part 122 and the wire pressing mechanism 1213 of the first housing part 121 to ensure the sealing of the wire trough, so as to achieve an IPX4 waterproof effect and effectively isolate the entry of external moisture.

[0057] In addition, absolute airtightness is not easy to achieve in engineering. In order to prevent moisture or water from accumulating in the installation cavity for a long time, the processing component is further provided with a heating module. The heating module can heat the temperature in the installation cavity to make the moisture or water evaporate and diffuse out of the installation cavity as much as possible; and it can also prevent the temperature in the installation cavity from being too low, resulting in the generation of condensed water in the installation cavity. In this embodiment, in order to avoid damage to the electrical components caused by the generation of condensed water or moisture, not only the installation cavity of the gas detection device is sealed to prevent a large amount of moisture from entering; at the same time, by adding a heating module inside the installation cavity, the generation of condensed water is effectively prevented.

[0058] Figure 7 The gas detection device of the embodiment has the following advantages:

[0059] 1. It has a detection gas chamber 1202 that is sealed relative to the installation cavity. As Figures 6 - 13 shown, the detection gas chamber 1202 is composed of a convex portion 1221, a first seal 13, the circuit board 111 of the processing component, and a waterproof breathable membrane 16. The first seal is sleeved on the convex rib 1223, then the first circuit board 111 and the first seal 13 are closely attached, and finally, through the extrusion of the first housing part, a relatively sealed detection gas chamber is formed. The refrigerant gas and moisture will enter the detection gas chamber 1202 through the waterproof breathable membrane 16. The induction probe will detect the refrigerant gas, and the moisture will be blocked by the first seal and the first circuit board and remain in the detection gas chamber without entering other internal spaces of its housing. At the same time, when the induction probe is working, it will generate a part of heat, which will evaporate part of the moisture entering the detection gas chamber, avoiding the generation of condensed water on the probe itself. The sealed detection gas chamber not only improves the response efficiency of detecting the refrigerant but also prevents moisture from entering the installation cavity to generate condensed water and damage the electrical components.

[0060] 2. It has a sealed installation cavity. Inside the housing, there is an installation cavity 1201, which is composed of the main body part 1221 of the second housing part 122, the first housing part 121, a second seal 14, a third seal 15, and a connecting wire 111. The second seal 14 is placed in the second groove 1225 and the sealing groove 1520, and the width of this groove is slightly larger than the diameter of the second seal. The third seal 15 is placed in the wire passing groove 1227 of the second housing part 122, and a raised waterproof strip 1229 is provided on the wall of the wire passing groove 1227 to form compression on the third seal 15, ensuring sealing and effectively isolating the outside moisture from entering the installation cavity and contacting the electrical components to cause damage to the electrical components.

[0061] During the use of the above gas detection device, it is also necessary to prevent water droplets from dripping onto the communication through-hole; if the communication through-hole is covered by water, it will be difficult for the measured gas to enter the detection gas chamber, which may lead to a reduction in detection accuracy or device failure. During the use of an air conditioner or a heat pump, refrigerant leakage may occur. New refrigerants (such as R32, R290, etc.) are flammable and toxic, posing a relatively high risk.To be able to timely identify this leakage risk, the gas detection device of the above embodiment can be set to detect the refrigerant leakage situation in real time. The gas detection device is installed near the evaporator of the indoor unit of the air conditioner or the heat pump; when the air conditioner or the heat pump is turned on and running, the temperature at the copper pipe is extremely low, and a large amount of condensed water will drip from the copper pipe. If the air intake hole of the gas detection device is just blocked and covered by these dripping condensed water, then the gas detection device may fail or its accuracy may be reduced and it cannot work properly.

[0062] In view of this, an embodiment of the present application further provides a gas detection device, as Figure 14 shown, which includes an electrical component and a housing 12; at least part of the electrical component is located inside the housing 12. For example, part of the connecting wire 1111 of the electrical component is located outside the housing 12, while devices such as a circuit board, resistors, and capacitors are located inside the housing. The housing 12 is provided with a communication through-hole 1203 so that the measured gas can enter the housing through the communication through-hole 1203 and be sensed by the induction probe of the electrical component. A waterproof and breathable membrane can also be attached to the housing 12, and the waterproof and breathable membrane covers the communication through-hole 1203. The housing 12 is provided with a water-blocking rib 123; the water-blocking rib 123 is located around the communication through-hole 1203.

[0063] In this embodiment, by designing a circle of water-blocking ribs 123 for blocking water droplets, it is beneficial to prevent the condensed water droplets from dripping and staying on the waterproof and breathable membrane, which can avoid the accumulation of condensed water on the surface of the waterproof and breathable membrane causing blockage, and avoid the gas detection device from not detecting the measured gas. Specifically, it can be set on part of the periphery of the communication through-hole 1203. At this time, in order to prevent water from dripping into the communication through-hole 1203, attention needs to be paid to the installation method of the gas detection device. It is advisable to set the water-blocking rib in the direction of the water source. The water-blocking rib 123 can also be set on the entire periphery of the communication through-hole 1203, so that the installation of the gas detection device is less restricted by the water source direction, and thus the installation is simpler, reducing the influence of water / condensed water on the detection. Among them, the setting of the electrical component and the housing can refer to the above embodiments of the present application, but is not limited to the description of the above embodiments.

[0064] In one embodiment, as Figure 8 shown, the housing 12 includes a first housing part 121 and a second housing part 122; the second housing part 122 includes a main body part 1221 and a convex part 1222; a communication through-hole 1203 is opened at the top of the convex part 1222; the water-blocking rib 123 is arranged at the outer edge part of the top of the convex part 1222.

[0065] Furthermore, as Figure 15 shown, the projection shape of the outer peripheral wall of the convex part 1222 on the upper surface of the main body part 1221 is a closed arc, and the arc is bent towards the communication through-hole 1203. The arc setting makes the water droplets flow away along the outer peripheral wall of the arc when the water droplets drip onto the outer peripheral wall of the convex part 1222, so that the water droplets will not accumulate on the convex part. The projection shape of the outer peripheral wall of the convex part 1222 on the upper surface of the main body part 1221 can also be square. In order to reduce the possibility of water droplet accumulation, the projection shape is set to be non-concave relative to the projection center, that is, the projection shape is convex or flat shapes similar to square, etc.

[0066] Further, along the opening direction of the communication through-hole 1203, the projection range of the water-blocking rib 123 on the upper surface of the main body portion 1221 becomes larger, that is, the water-blocking rib 123 is in a trumpet shape; thus, even if water drops onto the housing or the waterproof breathable film around the communication through-hole, it can flow out along the inner surface of the trumpet-shaped water-blocking rib, and thus will not accumulate on the waterproof breathable film.

[0067] Further, in one embodiment, as Figure 8 or Figure 15 shown, the outer peripheral wall of the convex portion 1222 includes two long side peripheral walls and two short side peripheral walls;

[0068] Among them, the inner included angle or the inner normal angle y of the symmetric inclined surface of the long side peripheral wall ranges from [90°, 180°], preferably [105°, 160°]. Or, the projected radian of the long side peripheral wall on the upper surface of the main body portion 1221 is [90°, 180°], preferably [105°, 160°], that is, the projection of the long side peripheral wall on the upper surface of the main body portion 1221 is an arc segment, and its radian is [90°, 180°], preferably [105°, 160°].

[0069] The inner included angle or the inner normal angle x of the symmetric inclined surface of the short side peripheral wall ranges from [90°, 180°], preferably [100°, 150°]. Or, the projected radian of the short side peripheral wall on the upper surface of the main body portion 1221 is [90°, 180°], preferably [100°, 150°], that is, the projection of the short side peripheral wall on the upper surface of the main body portion 1221 is an arc segment, and its radian is [90°, 180°], preferably [100°, 150°].

[0070] As Figure 16 shown, the angle β between the inner surface of the water-blocking rib 123 and the upper surface of the top of the convex portion 1222 ranges from [95°, 160°]. The outer surface of the water-blocking rib also needs to have a certain slope to guide the dripping water to flow away, so as to avoid staying on the convex portion for a long time and causing the temperature of the housing to become lower and more likely to generate condensed water.

[0071] Further, as Figure 8 shown, a water-blocking perimeter portion 1231 is provided on the upper part of the water-blocking rib 123; the water-blocking perimeter portion 1231 protrudes toward the side away from the communication through-hole 1203 to prevent the water droplets on the outer peripheral wall of the convex portion 1222 from flowing into the communication through-hole.

[0072] Further, as Figure 7 or Figure 8As shown, the gas detection device further includes a waterproof and breathable membrane 16; the waterproof and breathable membrane 16 is attached to the housing and covers the communication through-hole 1203; the housing is further provided with a partition portion 124, and the partition portion 124 straddles the communication through-hole 1203. In this embodiment, in order to prevent water droplets from completely covering the communication through-hole and preventing the measured gas from diffusing to the sensing component, the maximum aperture size of the communication through-hole can be set to be greater than 3 mm. It should be noted that, as Figure 8 shown, when the cross-section of the wall of the communication through-hole is circular, the maximum aperture is the diameter; when its cross-section is rectangular, the maximum aperture is the diagonal length; and when its cross-section is irregular, the maximum aperture refers to the length between the two points on the cross-section where the walls are farthest apart. In addition, if the communication through-hole is too large, a partition portion 124 is provided, and by providing the partition portion 124, it can effectively prevent external objects from damaging the waterproof and breathable membrane 16.

[0073] Furthermore, referring to Figure 16 , in one embodiment, a water guiding surface 125 is provided around the second housing portion 122; the water guiding surface 125 can be set as a water guiding inclined surface, and the included angle range α between it and the upper surface of the main body portion 1221 is [10°, 90°). Through the water guiding surface 125, water droplets are guided to flow away, avoiding condensed water droplets staying on the housing without moving, resulting in a lower temperature of the housing and making it easier to generate condensed water. The water guiding surface can also be perpendicular to the upper surface of the main body portion 1221 to prevent water droplets from gathering on the housing. The outer surface of the water blocking rib around the air intake hole of the electric control box also needs to have a certain slope to guide the dripping water to flow away, avoiding staying for a long time and causing the temperature of the housing to become lower and making it easier to generate condensed water.

[0074] Furthermore, at least two cushion blocks 1214 are provided on the outer side of the first housing portion 121. When the gas detection device is used for refrigerant detection, it is often installed on the sheet metal part of the air conditioner. The cushion blocks 1214 leave a gap between the gas detection device and the sheet metal part, avoiding large-area contact between the housing and the sheet metal part, which may cause the temperature of the housing to become lower and generate condensed water inside the housing.

[0075] Furthermore, as Figure 16 shown, the height H1 of the cushion block 1214 relative to the outer side surface of the first housing portion 121 is greater than or equal to 1.6 mm. The height H of the water blocking rib 123 relative to the outer surface of the top of the convex portion is greater than or equal to 2 mm. As Figure 7 shown, the electrical component includes a sensing component 012 and a processing component 011; the internal space of the housing 12 includes a detection gas chamber 1202 and an installation cavity 1202; the detection gas chamber and the installation cavity are relatively airtight and isolated; the communication through-hole is connected to the detection gas chamber 1202; the sensing component 012 is located in the detection gas chamber 1202; the processing component 011 is located in the installation cavity 1201; the sensing component 012 and the processing component 011 are electrically connected;

[0076] Through the structural design of the above-mentioned multiple inclined surfaces and arcs, the water droplets dripping from all directions are preferably diverted by the inclined surfaces or arc surfaces and do not accumulate on the housing or the waterproof and breathable membrane, which is beneficial to improving the detection reliability and the device life.

[0077] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0078] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A gas detection device, characterized in that: The invention comprises an electrical component (11); the electrical component (11) comprises at least a first circuit board (111), a second circuit board (112), a sensing probe (113) and a sensor (114); The sensing probe (113) is electrically connected to the first circuit board (111); the sensor (114) is arranged on the second circuit board (112), and the sensor (114) is electrically connected to the first circuit board (111) at least through the second circuit board (112); the sensing probe (113) is provided with a vent hole (1131); in the longitudinal direction of the sensing probe (113), the second circuit board (112) is closer to the vent hole (1131) than the first circuit board (111).

2. The gas detection device according to claim 1, characterized in that The sensor is a temperature and humidity sensor; the gas detection device further comprises a breathable membrane (115); the breathable membrane is located on the sensing probe and covers the vent (1131); the second circuit board is provided with a first through hole (1121); the sensing probe (113) is welded to the first circuit board 111, and the sensing probe (113) is at least partially located above the first through hole (1121); the distance between the upper surface of the sensing probe (113) and the upper surface of the second circuit board (112) is defined as h1, and the height of the temperature and humidity sensor is defined as h2, wherein the absolute value of the difference between h1 and h2 is less than or equal to 5 mm.

3. The gas detection device according to claim 1 or 2, characterized in that: The invention also includes a first bracket (116); the first bracket (116) is a conductor; the outer shell of the sensing probe (113) is a conductor; the outer shell of the sensing probe (113) is in contact with the first bracket (116); the first bracket includes a bracket pin (1161); the bracket pin (1161) is electrically connected to the reference ground terminal of the first circuit board (111).

4. The gas detection device according to claim 3, characterized in that It also includes a reference probe (1130); the second circuit board is provided with a second through hole (1122); the first bracket is provided with a first bracket through hole (1162) and a second bracket through hole (1163); the sensing probe (113) is sleeved on the first bracket through hole (1162), and the reference probe (1130) is sleeved on the second bracket through hole (1163); and the inner cavity of the reference probe is sealed.

5. The gas detection device according to claim 4, characterized in that: It also includes a second bracket (117); at least a portion of the second bracket (117) is located between the first bracket (116) and the first circuit board (11); and the second bracket is a non-heat-conducting body.

6. The gas detection device according to claim 5, characterized in that: The second bracket includes a bracket support portion (1173); the bracket support portion (1173) abuts against the lower surface of the second circuit board.

7. The gas detection device according to claim 6, characterized in that: The second bracket further includes a bracket body (1170) and a first buckle (1171), wherein the first buckle (1171) is clamped to the first bracket (116), and the first bracket (116) is limitedly arranged between the clamping surface of the first buckle (1171) and the bracket body (1170).

8. The gas detection device according to claim 7, characterized in that: The second bracket (117) further includes a second clip (1172); the second clip (1172) is clipped to the second circuit board (112), and the second circuit board (112) is limitedly arranged between the clipping surface of the second clip (1172) and the bracket support portion (1173).

9. The gas detection device according to claim 8, characterized in that: The number of the bracket support parts (1173) is greater than or equal to 2; the number of the first buckles (1171) is greater than or equal to 2; The gas detection device further comprises a pin header (118); one end of the pin header (118) is electrically connected to the second circuit board, and the other end is electrically connected to the first circuit board; The second bracket is also provided with a mounting through hole (1174), and the pin of the sensing probe passes through the mounting through hole and is soldered to the first circuit board; the pin of the reference probe passes through the mounting through hole and is soldered to the first circuit board.

10. The gas detection device according to claim 1 or 2, characterized in that: It also includes a shell (12); the internal space of the shell (12) includes a detection air chamber (1202) and a mounting cavity (1201); the detection air chamber and the mounting cavity are relatively airtightly isolated; the sensing probe (113) and the second circuit board (112) are located in the detection air chamber (1202); and the first circuit board is located in the mounting cavity; The detection gas chamber is provided with a communication hole communicating with the outside world; the gas detection device further comprises a waterproof breathable membrane, which is attached to the shell and covers the communication hole.

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