Ultraviolet gas detection device for detecting refrigerants

Abstract

This application provides an ultraviolet gas detection device for detecting refrigerants, comprising: a circuit board and a detection unit; the detection unit is mounted on the circuit board; the detection unit includes a detection housing, an ultraviolet light source module, and an ultraviolet detector; the ultraviolet light source module has a light-emitting part capable of emitting ultraviolet light; the ultraviolet detector includes an ultraviolet filter capable of transmitting ultraviolet light of a target wavelength; the light-emitting part faces the ultraviolet filter to directly transmit at least a portion of the ultraviolet light to the ultraviolet detector, or the light-emitting part and the filter are both disposed away from the circuit board, so that the ultraviolet light emitted by the light-emitting part can be reflected by the detection housing and transmitted to the ultraviolet detector. This application enables the detection of refrigerants, thereby improving the safety of air conditioning systems.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and in particular to an ultraviolet gas detection device for detecting refrigerants. Background Technology

[0002] In some air conditioning systems, in order to protect the atmospheric ozone layer, the use of environmentally friendly refrigerants such as R32 and R454B is being vigorously promoted. However, these refrigerants are slightly flammable and can form explosive mixtures when mixed with air. They pose a risk of combustion and explosion when exposed to heat sources or open flames. Therefore, there is a need for leak detection of these environmentally friendly refrigerants to improve the safety of air conditioning systems.

[0003] Some related technologies use infrared light detection to detect some common gases. However, because the wavelength of the infrared light emitted by the infrared light source of these infrared gas sensors is inconsistent with the infrared wavelength that refrigerants such as R32 can absorb, the infrared gas sensors in these technologies have difficulty detecting refrigerant gases such as R32. Summary of the Invention

[0004] The purpose of this application is to provide an ultraviolet gas detection device that is beneficial for improving the detection of refrigerant gases such as R32, thereby improving the safety of air conditioning systems.

[0005] An ultraviolet gas detection device provided in this application includes: a circuit board and a detection unit; the detection unit is mounted on the circuit board.

[0006] The detection unit includes a detection housing, an ultraviolet light source module, and an ultraviolet detector;

[0007] The ultraviolet light source module has a light-emitting part, which is capable of emitting ultraviolet light;

[0008] The ultraviolet detector includes an ultraviolet filter that can transmit ultraviolet light of the target wavelength.

[0009] The light-emitting part faces the ultraviolet filter to directly transmit at least a portion of the ultraviolet light to the ultraviolet detector; alternatively, both the light-emitting part and the filter are disposed away from the circuit board so that the ultraviolet light emitted by the light-emitting part can be transmitted to the ultraviolet detector after being reflected by the detection housing.

[0010] In this application, since the wavelength range of the ultraviolet light emitted by the light-emitting part of the ultraviolet light source module is basically consistent with the main absorption peak of ultraviolet light by refrigerants such as R32, when refrigerant gas is present in the environment where the ultraviolet gas detection device is located, the refrigerant will absorb the ultraviolet light emitted by the ultraviolet light source, resulting in a change in the intensity of the ultraviolet light. In this way, the ultraviolet detector can detect the refrigerant leak by detecting the change in ultraviolet light, thereby improving the safety of the air conditioning system. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of an ultraviolet gas detection device according to one embodiment of this application.

[0012] Figure 2 Is it like this? Figure 1 A schematic diagram of the cross-section of an ultraviolet gas detection device.

[0013] Figure 3 Is it like this? Figure 1 A schematic diagram of an explosion of an ultraviolet gas detection device.

[0014] Figure 4 Is it like this? Figure 1 A schematic diagram of a longitudinal section of an ultraviolet gas detection device at one angle.

[0015] Figure 5 Is it like this? Figure 1 An exploded schematic diagram of some structural components of an ultraviolet gas detection device.

[0016] Figure 6 Is it like this? Figure 1 An exploded view of another structural component of the ultraviolet gas detection device.

[0017] Figure 7 Is it like this? Figure 1 An exploded schematic diagram of another structural component of the ultraviolet gas detection device.

[0018] Figure 8 Is it like this? Figure 1 A schematic diagram of a longitudinal section of an ultraviolet gas detection device from another angle.

[0019] Figure 9 This is a three-dimensional structural diagram of an ultraviolet detector in an ultraviolet gas detection device.

[0020] Figure 10 This is a three-dimensional structural diagram of another type of ultraviolet detector in an ultraviolet gas detection device.

[0021] Figure 11 Is it like this? Figure 1 The diagram shows a partial top view of the structure of the ultraviolet gas detection device.

[0022] Figure 12 Is it like this? Figure 11 The diagram illustrates the relationship between the first and second straight lines.

[0023] Figure 13 This is a three-dimensional schematic diagram of an ultraviolet gas detection device according to another embodiment of this application.

[0024] Figure 14 Is it like this? Figure 13 A schematic diagram of an explosion of an ultraviolet gas detection device.

[0025] Figure 15 Is it like this? Figure 13 A schematic diagram of the optical transmission path of an ultraviolet gas detection device.

[0026] Figure 16 This is a schematic diagram of the structure of an air conditioning device provided in an embodiment of this application.

[0027] Figure 17 Is it like this? Figure 16 A schematic diagram of the control device. Detailed Implementation

[0028] As environmentally friendly refrigerants replace traditional refrigerants, the industry has discovered that some environmentally friendly refrigerants are more flammable than traditional refrigerants, posing a safety hazard to air conditioning systems. Therefore, it is necessary to use gas concentration detection devices to detect refrigerant leaks so that the air conditioning control system can promptly shut down and issue alarms, reducing the safety hazards posed by environmentally friendly refrigerants.

[0029] like Figures 1 to 12 The image shows an ultraviolet gas detection device 100 according to one embodiment of this application, which includes a housing 10, a circuit board assembly 20, and a waterproof and breathable membrane 30. The circuit board assembly 20 includes a detection unit 21 and a circuit board 22. The ultraviolet gas detection device 100 also has an inner cavity 200, so that at least a portion of the circuit board assembly 20 can be housed in the inner cavity 200. In some embodiments, the ultraviolet gas detection device 100 can be used to detect the concentration of gaseous refrigerant, so that when refrigerant leaks in the air conditioning system, it can promptly detect and provide feedback to the air conditioning control system, thereby reducing the safety hazards caused by refrigerant leaks.

[0030] like Figure 2 , Figure 3 As shown, the detection unit 21 is mounted on the circuit board 22. The detection unit 21 is used to detect the concentration of gaseous refrigerant (e.g., environmentally friendly refrigerants such as R32 and R454B). The detection unit 21 shown in the embodiment of this application is a detection unit 21 based on the principle of ultraviolet light detection.

[0031] refer to Figure 4The circuit board 22 also includes a processing chip 23 and a plurality of electronic components 24. The circuit board 22 includes a first surface 221 and a second surface 222 located on opposite sides of its thickness direction. The circuit board 22 has a plurality of conductive paths (not shown), at least a portion of which is electrically connected to the processing chip 23 and at least a portion of which is electrically connected to the electronic components 24.

[0032] In this embodiment, the detection unit 21 is mounted on the first surface 221 of the circuit board 22, and the processing chip 23 and several electronic components 24 are mounted on the second surface 222 of the circuit board 22. In other embodiments, the detection unit 21, processing chip 23, and several electronic components 24 can all be mounted on the same side surface of the circuit board 22. The processing chip 23 processes the signal of the gaseous refrigerant concentration detected by the detection unit 21 and transmits it to an external control board or processes it itself. The several electronic components 24 include filtering elements such as capacitors, resistors, and inductors, thereby amplifying and filtering the signal from the detection unit 21.

[0033] like Figure 3 and Figure 4 As shown, the outer casing 10 includes a first casing 11 and a second casing 12. The first casing 11 is located at the upper end of the second casing 12, meaning that the first casing 11 and the second casing 12 can be assembled together along the vertical direction. The first casing 11 includes a first wall portion 111 and a first peripheral wall 112 extending vertically from the first wall portion 111. The second casing 12 includes a second wall portion 121 and a second peripheral wall 122 extending vertically from the second wall portion 121. The first wall portion 111 and the second wall portion 121 are located on different sides of the circuit board 22 in the thickness direction. The first wall portion 111 is located on the side where the first surface 221 of the circuit board 22 is located, and the second wall portion 121 is located on the side where the second surface 222 of the circuit board 22 is located.

[0034] The first peripheral wall 112 and the second peripheral wall 122 can be fixedly connected or limited in their connection. The first peripheral wall 112 and the second peripheral wall 122 can also be fixed together by a snap-fit ​​connection. This snap-fit ​​connection eliminates the need for screws, resulting in a simple structure, easy assembly, and convenient disassembly of the housing during maintenance.

[0035] In the embodiments of this application, both the first housing 11 and the second housing 12 are plastic parts. (See reference...) Figure 4The second housing 12 has a rounded rectangular outer contour in its cross-section. Specifically, the second peripheral wall 122 includes a first sub-wall 141, a second sub-wall 142, a third sub-wall 143, and a fourth sub-wall 144. The first sub-wall 141 and the third sub-wall 143 are parallel, and the second sub-wall 142 and the fourth sub-wall 144 are parallel. The second peripheral wall 122 also includes a first corner wall 151 connecting the first sub-wall 141 and the second sub-wall 142, a second corner wall 152 connecting the second sub-wall 142 and the third sub-wall 143, a third corner wall 153 connecting the third sub-wall 143 and the fourth sub-wall 144, and a fourth corner wall 154 connecting the fourth sub-wall 144 and the first sub-wall 141. To adapt to the second housing 12, the first housing 11 also has a rounded rectangular outer contour in its cross-section. Correspondingly, the circuit board 22 is also a regular rectangular plate adapted to the shape of the second housing 12.

[0036] refer to Figure 4 As shown, the circuit board 22 is fixed to the second housing 12, and the second peripheral wall 122 surrounds the circuit board 22 circumferentially. The detection unit 21 is at least partially located between the circuit board 22 and the first wall 111. The circuit board 22 is rectangular, and the thickness directions of the circuit board 22, the first wall 111, and the second wall 121 are approximately co-directional.

[0037] To ensure the target gas can be detected by the detection unit 21, the housing 10 has a first vent 50 and a second vent 60. The first vent 50 and the second vent 60 are respectively positioned facing different sides of the detection unit 21 and located at different locations within the housing 10. These two vents facing different sides of the detection unit facilitate, on the one hand, expanding the gas entry and exit paths, ensuring sufficient air intake, and improving gas circulation efficiency; on the other hand, they ensure that the detection unit 21 can quickly detect the target gas entering from different positions and directions within the housing 10, thereby improving the detection sensitivity of the detection unit 21 and shortening its response time. (Reference) Figure 3 As shown, the first ventilation section 50 is located on the first wall section 111, and the second ventilation section 60 is located on the first peripheral wall 112.

[0038] The waterproof and breathable membrane 30 of the gas detection device 100 includes a first membrane 31 and a second membrane 32. The first membrane 31 and the second membrane 32 can be an integral structure or a separate structure. Figure 4In the illustrated embodiment, the first membrane 31 and the second membrane 32 are two independent membranes. The arrangement of the first membrane 31 and the second membrane 32 reduces the possibility of moisture, dust, and other impurities from outside the gas detection device 100 entering the inner cavity 200, thereby giving the gas detection device 100 better waterproof and dustproof performance. The waterproof and breathable membrane 30 may include a waterproof and breathable porous material attached to polyester fiber fabric through a specific process, with a pore size at the nanometer level, thus providing waterproof, dustproof, and breathable properties.

[0039] The first membrane 31 covers at least a portion of the first ventilator 50, and the second membrane 32 covers at least a portion of the second ventilator 60. In the embodiments of this application, the first membrane 31 is located between the first ventilator 50 and the inner cavity 200, and the second membrane 32 is located between the second ventilator 60 and the inner cavity 200. That is, both the first membrane 31 and the second membrane 32 are located inside the outer shell 10, thus making them less susceptible to the influence and damage of the external environment.

[0040] like Figure 5 As shown, to better fix the waterproof and breathable membrane 30, the ultraviolet gas detection device 100 also includes a support member 40. The support member 40 is limited or fixedly connected to the housing. The support member 40 includes a first support portion 41, a second support portion 42, and a third support portion 43, which are integrated into one structure. The support member 40 can be a plastic part with a certain strength and hardness, which has low material cost and can be manufactured by low-cost manufacturing methods such as injection molding. Part of the first membrane 31 is fixed between the first wall portion 111 and the first support portion 41, and part of the second membrane 32 is fixed between the third wall portion 130 and the second support portion 42. Specifically, both the first support portion 41 and the second support portion 42 can be closed annular structures. The size of the first support portion 41 can be approximately equivalent to the size of the first venting portion 50, and the size of the second support portion 42 can be approximately equivalent to the size of the second venting portion 60. The support member 40 is also housed in the inner cavity 200. The peripheral portion of the first membrane 31 is clamped and positioned between the first venting section 50 and the first support member 40, and the peripheral portion of the second membrane 32 is clamped and positioned between the second venting section 60 and the second support member 40. Furthermore, while the first membrane 31 and the second membrane 32 are clamped and fixed, they can also be adhesively bonded to corresponding positions on the outer casing 10 or the support member 40 to further enhance their fixing strength.

[0041] The third support part 43 can be bent in at least part of its area, which gives the third support part 43 a certain degree of toughness and a certain range of deformation, which helps to improve the overall strength of the support member 40 and makes the support member 40 less prone to breakage.

[0042] like Figure 2 , Figure 4 , Figure 7 and Figure 8 As shown, this application also provides a detection unit 21 employing the principle of ultraviolet light detection. The detection unit 21 includes a detection housing 70, an ultraviolet light source module 71, and an ultraviolet detector 72. The detection housing 70 has an inner surface 704 and an outer surface 705. The cross-sectional outline of the inner surface 704 is circular, and the outer surface 705 includes a mounting surface 7051 that contacts or is adjacent to the circuit board 22. The mounting surface 7051 is planar or slightly curved. At least a portion of the inner surface 704 is polished or at least a portion of the inner surface 704 is gold-plated.

[0043] The ultraviolet light source module 71 includes a light-emitting part 801, which is disposed at one end of the detection housing 70 along its length and is used to emit ultraviolet light. The ultraviolet detector 72 is disposed at the other end of the detection housing 70 along its length and includes an ultraviolet filter 802, which is capable of transmitting ultraviolet light of the target wavelength.

[0044] The light-emitting part 801 faces the ultraviolet filter part 802. The ultraviolet light source module 71 and the ultraviolet detector 72 are almost coaxially arranged. The detection housing 70 is cylindrical. The ultraviolet light emitted by the light-emitting part 801 of the ultraviolet light source module 71 is incident on the ultraviolet detector 72 almost in a straight line. The ultraviolet light source module 71 and the ultraviolet detector 72 are electrically connected to the circuit board 22. The detection unit 21 also has a gas chamber 700. The detection housing 70 is disposed around the gas chamber 700. The detection housing 70 has a mating hole 701, which penetrates the inner surface 704 and the outer surface 705 of the detection housing 70. The mating hole 701 communicates with the first vent 50, the second vent 60, and the gas chamber 700.

[0045] The principle of the aforementioned detection unit 21 is explained as follows: Different gases have different absorption spectra due to differences in their molecular structure, concentration, and energy distribution. When detecting a target gas, the absorption of light of a characteristic wavelength by the target gas conforms to the Lambert-Beer law. Taking the ultraviolet light source module 71 as an example, when the ultraviolet light source module 71 emits an ultraviolet beam that passes through the gas chamber 700 and reaches the ultraviolet detector 72, the target gas will absorb ultraviolet light of a specific wavelength. That is to say, externally leaked refrigerant gas will enter the inner cavity 200 through the venting part of the outer shell 10, the waterproof and breathable membrane 30, and other structures, and then enter the gas chamber 700 through the mating hole 701 on the detection shell 70. The target gas entering the gas chamber 700 will absorb ultraviolet light of a characteristic wavelength. In this way, the ultraviolet detector 72 can calculate information such as the concentration of the refrigerant gas by detecting changes in light intensity.

[0046] refer to Figure 2As shown, the detection housing 70 has a first mounting area 702 and a second mounting area 703 at its two ends along its length. The ultraviolet light source module 71 is at least partially located in the first mounting area 702, and its outer peripheral wall is bonded and fixed to the inner peripheral wall of the detection housing 70 in the first mounting area 702. The ultraviolet detector 72 is at least partially located in the second mounting area 703, and its outer peripheral wall is bonded and fixed to the inner peripheral wall of the detection housing 70 in the second mounting area 703.

[0047] The detection unit 21 also includes a first adapter plate 73 and a second adapter plate 74. Both the first adapter plate 73 and the second adapter plate 74 have a mounting body 78 and a connector 79. A circuit board 22 has through-holes 25 corresponding to the two connectors 79. At least a portion of the connector 79 is located within the connector hole 25. The main body 433 is located between the first wall portion 111 and the circuit board 22. The pins of the ultraviolet light source module 71 are soldered to the mounting body 78 of the first adapter plate 73, and the pins of the ultraviolet detector 72 are soldered to the mounting body 78 of the second adapter plate 74. Both the first adapter plate 73 and the second adapter plate 74 are soldered to the circuit board 22. Specifically, both the first adapter board 73 and the second adapter board 74 can be a single adapter circuit board 22 that provides electrical connection. Taking the first adapter board 73 and the ultraviolet light source module 71 as an example, the pins of the ultraviolet light source module 71 do not need to be bent, avoiding the risk of damage or breakage. The pins of the ultraviolet light source module 71 are first soldered to the first adapter board 73, and then electrically connected to the circuit board 22 through the first adapter board 73. The mounting body of the first adapter board 73 can be provided with pin holes for the pins of the ultraviolet light source module 71 to be inserted. The pins of the ultraviolet light source module 71 pass through the pin holes from one side of the first adapter board 73 and are partially exposed on the other side of the first adapter board 73. Then, the pins of the ultraviolet light source module 71 are soldered to the first adapter board 73. The first adapter board 73 is also soldered to the circuit board 22 through a plug-in connection. The connection method between the second adapter board 74 and the ultraviolet detector 72 is similar and will not be described in detail here. The first adapter plate 73 and the second adapter plate 74 respectively abut against the end faces on both sides of the detection housing 70 along its length.

[0048] The light-emitting part 801 of the ultraviolet light source module 71 is a MEMS type blackbody light source, and the peak range of the ultraviolet light emitted by the light-emitting part 801 is 1μm to 16μm.

[0049] The ultraviolet detector 72 can be a single-channel or dual-channel photodetector; for details, please refer to [reference needed]. Figure 2 and Figure 9As shown, the ultraviolet detector 72 includes a detection area 721 and a reference area 722 that are independently arranged. The ultraviolet filter 802 includes a first filter 8021 and a second filter 8022. The first filter 8021 is located between the gas chamber 700 and the detection area 721, and the second filter 8022 is located between the gas chamber 700 and the reference area 722. The first filter 8021 can transmit ultraviolet light of the target wavelength, while the second filter 8022 can transmit ultraviolet light of other wavelengths. With this arrangement, since both the detection area 721 and the reference area 722 are affected by temperature, humidity, and cross-interference between different gases, the accuracy of the refrigerant gas concentration detected by the detection area 721 can be improved by using the ratio or difference of their voltage output signals when calculating the concentration. For example, to detect the concentration of refrigerant R32 gas, where the main ultraviolet absorption peak of R32 is between 100nm and 300nm, a second filter 8022 that is not absorbed by the wavelength of R32 gas can be used in the reference region 722. Therefore, the intensity of ultraviolet light received by the reference region 722 and the detection region 721 is inconsistent, and the weak electrical signals generated by the two will also be different. After being processed by the analog amplification circuit on the circuit board 22 and filtered, the signal is input to the processing chip 23 on the circuit board 22. The processing chip 23 can calculate the concentration of R32 gas. The advantage of using a dual-detection channel ultraviolet detector 72 is that interference can be eliminated by comparing the two, resulting in a more accurate concentration value.

[0050] Of course, in some application scenarios where the requirements for detection accuracy are not so high, such as Figure 10 As shown, the ultraviolet detector 72 can have only a detection area 721 without a reference area 722, which helps to save costs.

[0051] In order to ensure that the ultraviolet light emitted by the light-emitting part 801 of the ultraviolet light source module 71 can enter the ultraviolet detector 72 in a straight line as much as possible, such as Figure 8 The ultraviolet light source module 71 also includes a reflector cup 803, the outer peripheral wall of which is bonded to the inner surface 704 of the detection housing 70. The reflector cup 803 has a constricted end 8031 ​​and a flared end 8032, with the flared end 8032 closer to the ultraviolet detector 72 than the constricted end 8031. The reflector cup 803 has a reflective concave surface 804 extending from the flared end 8032 to the constricted end 8031, and the light-emitting part 801 is located at the focal point of the reflective concave surface 804. As a type of reflective device, the reflector cup 803 can utilize limited light energy to control the illumination distance and illumination area of ​​the main light spot of the light-emitting element through light reflection.

[0052] To improve the detection accuracy of the gas detection device 100, the cylindrical detection housing 70 needs to maintain a certain length. To increase the length of the detection housing 70 within a confined space, this application refers to... Figure 12 As shown, a first straight line X1 and a second straight line X2 are defined on a plane M perpendicular to the height direction H of the gas detection device 100. The detection housing 70 has a first projection S1 on this plane, and the first straight line X1 extends along the length direction of the first projection S1. The second straight line X2 extends along either the width or length direction of the gas detection device 100. Figure 12 The second straight line X2 extends in the same direction as the center line of the gas detection device 100 in the width direction. 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 detection unit 21, and correspondingly, it is also beneficial for extending the distance between the light source module 71 and the detection probe 72. Thus, with a longer optical path, the gas can absorb ultraviolet light more fully, which is beneficial for improving the detection accuracy of the gas detection device 100.

[0053] In the embodiments of this application, the detection unit 21 is located between the first corner wall 151 and the third corner wall 153 in the length direction of the detection housing 70, or the detection unit 21 is located between the second corner wall 152 and the fourth corner wall 154.

[0054] In order to give the gas detection device 100 a certain electromagnetic shielding function, such as Figure 7 As shown, the gas detection device 100 also includes a first metal shield 75, a second metal shield 76, and a plurality of electronic components 24. The plurality of electronic components 24 and the detection unit 21 are respectively mounted on different sides of the circuit board 22 in the thickness direction. The detection unit 21 is mounted on the first surface 221 of the circuit board 22, and the plurality of electronic components 24 are mounted on the second surface 222 of the circuit board 22.

[0055] The first metal shield 75 includes a first plate 751 and a first support foot 752, and the second metal shield 76 includes a second plate 761 and a second support foot 762. The first plate 751 is mounted on the side of the detection unit 21 away from the circuit board 22, and the second plate 761 is mounted on the side of the multiple electronic components 24 away from the circuit board 22. That is, the first plate 751 is located on the side where the first surface 221 is located, and the second plate 761 is located on the side where the second surface 222 is located. The first support foot 752 extends from the first plate 751 toward the circuit board 22, and the second support foot 762 extends from the second plate 761 toward the circuit board 22. The first plate 751 is provided with a plurality of fourth through holes 753, which can be aligned with the through holes of the first vent 50, so that gas can more easily reach the detection unit 21 and is less likely to be blocked by the first plate 751.

[0056] Both the first support leg 752 and the second support leg 762 are provided with through holes 77. Screws can be passed through the through holes 77 of the first support leg 752 and the second support leg 762 to fix the two electromagnetic shielding covers to the circuit board 22. Both the first support leg 752 and the second support leg 762 are electrically connected to the ground terminal of the circuit board 22. The two electromagnetic shielding covers can effectively protect the circuit board assembly 20 from electromagnetic shielding, which is conducive to expanding the application environment of the gas detection device 100 and avoiding external electromagnetic signal interference to the gas detection device 100 in detecting the target gas.

[0057] In addition to direct-type ultraviolet gas detection devices, such as Figures 13 to 15 In another embodiment of this application, the ultraviolet gas detection device 100 may also employ a reflective optical path structure. (See reference...) Figure 14 As shown, the circuit board assembly 20 of the ultraviolet gas detection device 100 includes a detection unit 21 and a circuit board 22. The ultraviolet light source module 71 and the ultraviolet detector 72 of the detection unit 21 do not face each other. The light-emitting part 801 and the ultraviolet filter part 802 are both arranged facing away from the circuit board 22, so that the ultraviolet light emitted by the light-emitting part 801 can be transmitted to the ultraviolet detector 72 after being reflected by the detection housing 70.

[0058] Referring to Figure 15, the detection housing 70 can be composed of two parts: a first housing 706 and a second housing 707. The first housing 706 and the second housing 707 are assembled vertically, with the air chamber 700 located between them. The first housing 706 has a mating hole 701, and the second housing 707 has a first receiving portion 91 and a second receiving portion 92. These two receiving portions 91 and 92 can be through-hole structures on the second housing 707. The first receiving portion 91 can accommodate at least a portion of the ultraviolet light source module 71, and the second receiving portion 92 can accommodate at least a portion of the ultraviolet detector 72. The first receiving portion 91 and the second receiving portion 92 are located at two different corners of the second housing 707.

[0059] The inner surface of the first housing 706 has several reflective surfaces 7061 exposed in the detection chamber 700. The ultraviolet light emitted by the light-emitting part 801 of the ultraviolet light source module 71 can be transmitted to the ultraviolet detector 72 after multiple reflections by the reflective surfaces.

[0060] The detection chamber 700 extends from the first receiving portion 91 to the other side of the detection housing 70 along its length, then bends and finally extends to the second receiving portion 92. This bend-shaped optical path structure greatly improves the transmission path of ultraviolet light, which is beneficial for enhancing the absorption effect of ultraviolet light.

[0061] Furthermore, the optical paths of the ultraviolet light in the first housing section 91 and the ultraviolet light in the second housing section 92 are approximately parallel, and the plane containing their optical paths is denoted as the first plane. The plane containing the optical path of the ultraviolet light after passing through several reflective surfaces is denoted as the second plane. The first and second planes are approximately perpendicular. By transmitting the ultraviolet light in two mutually perpendicular planes, the space of the ultraviolet gas detection device is fully utilized, enabling long-path beam transmission within a smaller space, thereby reducing the size of the ultraviolet gas detection device.

[0062] Figure 16 This is a schematic diagram of the structure of an air conditioning unit 600. The air conditioning unit 600 includes an indoor unit 61 and an outdoor unit 62. The indoor unit 61 includes an indoor heat exchanger 611, and the outdoor unit 62 includes a compressor 621, an outdoor heat exchanger 622, a throttling device 623, and a cooling / heating mode switching reversing valve 65, etc. In some embodiments, the indoor unit 61 includes an indoor controller 610, and the outdoor unit 62 includes an outdoor controller 620. The air conditioning unit 600 also includes a refrigerant pipe 63 for refrigerant flow; for example, the refrigerant pipe 63 may be located between the indoor unit 61 and the outdoor unit 62. The air conditioning unit 600 also includes a control device 300. It should be noted that in some other embodiments, the indoor controller 610 and the outdoor controller 620 may be omitted; that is, the air conditioning unit 600 directly controls external components such as the compressor, indoor and outdoor heat exchanger fans, remote alarm devices, and indoor ventilation devices through the control device 300.

[0063] This application also provides a control device, such as... Figure 17 As shown, the control device 300 includes a processing unit 203, an indoor fan control module 211, and an ultraviolet gas detection device interface 204. One end of the ultraviolet gas detection device interface 204 is electrically connected to the processing unit 203, and the other end can be electrically or communicatively connected to the ultraviolet gas detection device 100. Electrical connection means that electrical signals are transmitted through terminals, wires, etc., in which case the ultraviolet gas detection device interface 204 can be a terminal block or a solder pad. Communication connection can be achieved through methods such as RS232 communication, USB communication, NB-IoT, and various wireless communication protocols.

[0064] Processing unit 203 is used to acquire refrigerant information sent by ultraviolet gas detection device 100 at least through ultraviolet gas detection device interface 204. The refrigerant information includes at least a first communication signal or a first electrical signal indicating refrigerant leakage. The first communication signal or the first electrical signal can be refrigerant concentration information, which processing unit 203 uses to determine leakage. The first communication signal or the first electrical signal can also be directly the judgment information indicating refrigerant leakage. The input terminal of indoor fan control module 211 is electrically connected to the output terminal of processing unit 203. The output terminal of indoor fan control module 211 can be electrically or communicatively connected to indoor fan 612. When processing unit receives the first communication signal or the first electrical signal, processing unit 203 sends a first control signal to indoor fan control module 211 based on the first communication signal or the first electrical signal. Indoor fan control module 211 controls indoor fan 612 to operate according to the first control signal. Specifically, in the event of refrigerant leakage, it is advisable to control the indoor fan to operate at maximum speed to disperse the leaked refrigerant as quickly as possible, preventing refrigerant accumulation and potential risks. The indoor fan control module 211 may include a relay for controlling the electrical signals of the indoor fan.

[0065] In other embodiments, the indoor fan control module 211 can also be replaced by a control module that controls other devices, such as an indoor controller power control module, an outdoor controller power control module, a remote terminal (such as an alarm, a user's mobile phone, or other electronic device) control module, or an air conditioning system valve power control module. Correspondingly, the processing unit 203 can also control other devices through the aforementioned control modules to perform corresponding operations, thereby improving the safety of the air conditioning system.

[0066] The above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. The understanding of this application should be based on those skilled in the art. Although this specification has described this application 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 this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. An ultraviolet gas detection device for detecting refrigerants, characterized in that, include: Circuit board (22) and detection unit (21); the detection unit (21) is mounted on the circuit board (22); the detection unit (21) includes a detection housing (70), an ultraviolet light source module (71) and an ultraviolet detector (72); The ultraviolet light source module (71) has a light-emitting part (801) that can emit ultraviolet light; The ultraviolet detector (72) includes an ultraviolet filter (802) that can transmit ultraviolet light of the target wavelength. The ultraviolet filter (802) includes a first filter (8021) and a second filter (8022). The light-emitting part (801) faces the ultraviolet filter part (802) to directly transmit at least a portion of the ultraviolet light to the ultraviolet detector (72); or, the light-emitting part (801) and the filter are both disposed away from the circuit board (22) so that the ultraviolet light emitted by the light-emitting part (801) can be transmitted to the ultraviolet detector (72) after being reflected by the detection housing (70). The ultraviolet detector 72 is a dual-channel photodetector, which includes a detection area 721 and a reference area 722 that are set independently of each other.

2. The ultraviolet gas detection device according to claim 1, characterized in that, The light-emitting part (801) is a MEMS light source, and the peak range of the ultraviolet light emitted by the light-emitting part (801) is 100nm~300nm; the detection housing (70) is provided with a detection gas chamber (700) for ultraviolet light transmission. The ultraviolet detector (72) includes a detection area (721) and a reference area (722). The first filter (8021) is located between the detection chamber (700) and the detection area (721), and the second filter (8022) is located between the detection chamber (700) and the reference area (722). The first filter (8021) can transmit ultraviolet light of the target wavelength, and the second filter (8022) can transmit ultraviolet light other than the target wavelength.

3. The ultraviolet gas detection device according to claim 2, characterized in that, It also includes a first housing (11) and a second housing (12), the first housing (11) including a first wall portion (111) and a first peripheral wall (112) extending vertically from the first wall portion (111), the second housing (12) including a second wall portion (121) and a second peripheral wall (122) extending vertically from the second wall portion (121); the first wall portion (111) and the second wall portion (121) are respectively located on different sides of the thickness direction of the circuit board (22); The first peripheral wall (112) is fixedly connected or limited to the second peripheral wall (122); the circuit board (22) is fixed to the second housing (12), and the second peripheral wall (122) surrounds the circuit board (22) circumferentially; the detection unit (21) is at least partially located between the circuit board (22) and the first wall (111).

4. The ultraviolet gas detection device according to claim 3, characterized in that, Along the length of the detection housing (70), the detection chamber (700) is located between the ultraviolet light source module (71) and the ultraviolet detector (72); the detection housing (70) is also provided with a mating hole (701) that penetrates the wall thickness direction of the detection housing (70), and the mating hole is connected to the detection chamber (700).

5. The ultraviolet gas detection device according to claim 4, characterized in that, The detection housing (70) has an inner surface (704) and an outer surface (705). The cross-sectional profile of the inner surface (704) is circular. The outer surface (705) includes a mounting surface (7051) that contacts or is adjacent to the circuit board (22). The mounting surface (7051) is planar or slightly curved. At least a portion of the inner surface (704) is polished or at least a portion of the inner surface is gold-plated.

6. The ultraviolet gas detection device according to claim 5, characterized in that, The detection housing (70) has a first mounting area (702) and a second mounting area (703) at both ends along its length. The ultraviolet light source module (71) is at least partially located in the first mounting area (702), and the outer peripheral wall of the ultraviolet light source module (71) is fixed to the inner surface (704) of the detection housing (70) in the first mounting area (702); The ultraviolet detector (72) is at least partially located in the second mounting area (703), and the outer peripheral wall of the ultraviolet detector (72) is fixed to the inner surface (704) of the detection housing (70) in the second mounting area (703).

7. The ultraviolet gas detection device according to claim 5, characterized in that, The ultraviolet light source module (71) further includes a reflector cup (803), the outer peripheral wall of which is bonded to the inner surface (704) of the detection housing (70); the reflector cup (803) has a constricted end (8031) and a flared end (8032), the flared end (8032) being closer to the ultraviolet detector (72) than the constricted end (8031); the reflector cup (803) has a reflective concave surface (804) extending from the flared end (8032) to the constricted end (8031), and the light-emitting part (801) is disposed at the focal point of the reflective concave surface (804).

8. The ultraviolet gas detection device according to claim 3, characterized in that, The second peripheral wall (122) includes a first sub-wall (141), a second sub-wall (142), a third sub-wall (143), and a fourth sub-wall (144). The first sub-wall (141) and the third sub-wall (143) are parallel, and the second sub-wall (142) and the fourth sub-wall (144) are parallel. The second peripheral wall (122) also includes a first corner wall (151) connected between the first sub-wall (141) and the second sub-wall (142), a second corner wall (152) connected between the second sub-wall (142) and the third sub-wall (143), a third corner wall (153) connected between the third sub-wall (143) and the fourth sub-wall (144), and a fourth corner wall (154) connected between the fourth sub-wall (144) and the first sub-wall (141). In the length direction of the detection housing (70), the detection unit (21) is located between the first corner wall (151) and the third corner wall (153), or the detection unit (21) is located between the second corner wall (152) and the fourth corner wall (154).

9. The ultraviolet gas detection device according to claim 6, characterized in that, The detection unit (21) further includes a first adapter plate (73) and a second adapter plate (74); both the first adapter plate (73) and the second adapter plate (74) have a mounting body (78) and a plug-in portion (79), and the circuit board (22) is provided with plug-in holes (25) corresponding to the two plug-in portions (79) respectively; the plug-in portion (79) is at least partially located in the plug-in hole (25); the mounting body (78) is located between the first wall portion (111) and the circuit board ( Between 22); the pins of the light-emitting part (801) are welded to the mounting body (78) of the first adapter plate (73), and the pins of the ultraviolet detector (72) are welded to the mounting body (78) of the second adapter plate (74); the first adapter plate (73) and the second adapter plate (74) are both welded to the circuit board (22); the first adapter plate (73) and the second adapter plate (74) respectively abut against the end faces on both sides of the detection housing (70) in the length direction.

10. The ultraviolet gas detection device according to claim 4, characterized in that, The detection housing (70) includes a first sub-shell (706) and a second sub-shell (707) assembled vertically. The detection gas chamber (700) is located between the first sub-shell (706) and the second sub-shell (707). The first sub-shell (706) is provided with the mating hole, and the second sub-shell (707) is provided with a first receiving part (91) and a second receiving part (92). The ultraviolet light source module (71) is located in the first receiving part (91), and the ultraviolet detector (72) is located in the second receiving part (92). The first receiving part (91) and the second receiving part (92) are located at two different corners of the second shell (707); the inner surface of the first shell (706) has a plurality of reflective surfaces (7061) exposed in the detection air chamber (700), and the ultraviolet light emitted by the light-emitting part (801) of the ultraviolet light source module (71) can be transmitted to the ultraviolet detector (72) after multiple reflections by the reflective surfaces (7061).

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