Multi-channel refrigerant leakage detector

Abstract

The invention relates to the technical field of gas detection, in particular to a multi-channel refrigerant leakage detector. The multi-channel refrigerant leakage detector comprises a gas inlet, a gas outlet and a gas absorption chamber arranged between the gas inlet and the gas outlet. The gas inlet end and the gas outlet end of the gas absorption chamber are respectively provided with an infrared blackbody light source and a multi-channel infrared detector, the multi-channel infrared detector comprises at least two detection channels, and optical filters corresponding to the detection channels are respectively configured to be suitable for detecting one kind of refrigerant gas; the multi-channel infrared detector is connected with a control unit, and the control unit is used for gating a detection channel corresponding to the type of the refrigerant gas to be detected in the multi-channel infrared detector when the gas at the gas inlet is subjected to leakage detection, and generating a qualitative detection result according to a detection signal of the detection channel. According to the multi-channel refrigerant leakage detector, leakage of various refrigerants can be conveniently and accurately detected.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a multi-channel refrigerant leakage detector. Background Art

[0002] Gas Sniffer is a device used to detect and analyze gas leaks, and is widely used in the fields of industry, environmental protection, safety, etc. It can detect a variety of gases, including but not limited to combustible gases, toxic gases, volatile organic compounds (VOCs), etc.

[0003] Among gas sniffing detectors, infrared gas sniffing detectors that use non-dispersive infrared technology (NDIR, Non-Dispersive InfraRed) for gas detection are widely used in various gas detection scenarios due to their advantages such as no direct contact with the gas and long service life.

[0004] In the prior art, when performing refrigerant leak detection on some equipment, due to the different types of refrigerant gases, it is often necessary to replace the corresponding gas sniffing detector for detection or replace the detection sensor in the gas sniffing detector according to the type of refrigerant being detected, which is very inconvenient and insensitive. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the purpose of the present application is to provide a multi-channel refrigerant leakage detector that can accurately detect the leakage of multiple refrigerants without replacing the sensor.

[0006] To achieve the above-mentioned purpose, the present application provides a multi-channel refrigerant leakage detector, comprising a gas inlet, a gas outlet and a gas absorption chamber arranged between the gas inlet and the gas outlet; the gas inlet end and the gas outlet end of the gas absorption chamber are respectively provided with an infrared blackbody light source and a multi-channel infrared detector, the multi-channel infrared detector comprises at least two detection channels, the filters corresponding to each detection channel of the multi-channel infrared detector are respectively configured to be suitable for detecting a refrigerant gas, the multi-channel infrared detector is connected to a control unit, the control unit is used for selecting the detection channel corresponding to the type of refrigerant gas to be detected in the multi-channel infrared detector when leak detection is performed on the gas at the gas inlet, and generating a qualitative detection result according to the detection signal of the detection channel.

[0007] Furthermore, the multi-channel infrared detector includes at least two of the following detection channels:

[0008] a carbon dioxide detection channel configured to detect carbon dioxide gas;

[0009] A hydrocarbon refrigerant detection channel configured to detect at least one hydrocarbon refrigerant gas;

[0010] The halogen refrigerant detection channel is configured to detect at least one halogen refrigerant gas.

[0011] Furthermore, the multi-channel infrared detector also includes a reference channel. The control unit is also used to sequentially select the reference channel of the multi-channel infrared detector and the detection channel corresponding to the type of refrigerant gas to be tested when leak detection is performed on the gas at the gas inlet, and generate quantitative detection results based on the detection signals of the reference channel and the detection channel.

[0012] Furthermore, between the multi-channel infrared detector and the control unit there is also provided:

[0013] A switch, connected to the multi-channel infrared detector and the control unit, for selecting a channel through which the multi-channel infrared detector outputs a detection signal;

[0014] The filter amplifier circuit is connected to the switch and is used for filtering and amplifying the detection signal and then outputting it to the control unit.

[0015] Furthermore, it also includes:

[0016] An acceleration sensor is connected to the control unit and is used to detect the acceleration of the refrigerant leakage detector.

[0017] Furthermore, at least 80% of the infrared light emitted by the infrared blackbody light source enters the gas absorption chamber, and at least 80% of the infrared light after passing through the gas absorption chamber is irradiated onto the infrared detector.

[0018] Furthermore, the infrared blackbody light source is configured to be driven by a constant power driving circuit.

[0019] Furthermore, the gas absorption chamber is wrapped by two shielding covers.

[0020] Furthermore, it also includes a Bluetooth module, which is connected to the control unit and is used to transmit the detection result via Bluetooth.

[0021] To achieve the above object, the present application also provides a refrigerant leakage detection method, which is applied to the multi-channel refrigerant leakage detector as described above, and the method comprises:

[0022] According to the type of gas to be detected, the reference channel of the multi-channel infrared detection and the detection channel corresponding to the gas type are selected in sequence;

[0023] The concentration of the gas to be measured is generated based on the detection signal of the reference channel and the detection signal of the gated detection channel.

[0024] The multi-channel refrigerant leakage detector of the present application has a simple structure, can accurately detect the leakage of multiple refrigerants without replacing the sensor, has high detection accuracy and strong anti-interference ability.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0027] Figure 1 This is a principle block diagram of a multi-channel refrigerant leak detector according to Example 1 of the present application;

[0028] Figure 2 This is a schematic structural diagram of the gas absorption chamber of Example 1 of the present application;

[0029] Figure 3 This is a structural schematic diagram of a constant power driving circuit according to Embodiment 1 of the present application;

[0030] Figure 4 It is a schematic diagram of the change of the detection signal under various examples;

[0031] Description of the drawings: 1-first PCB board, 2-infrared blackbody light source, 3-side foam, 4-first shielding cover, 5-third PCB board, 6-gas absorption chamber, 7-bottom foam, 8-second shielding cover, 9-top foam, 10-sealing ring, 11-multi-channel infrared detector, 12-second PCB board, 13-screw, 14-back cover, 100-control unit, 101-power supply, 102-switch, 103-filter amplifier circuit, 104-voltage reference unit, 105-communication unit, 106-constant power drive circuit, 107-acceleration sensor. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0033] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0034] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0035] It should be noted that the modifications of "one" and "plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0036] Hydrocarbon refrigerants are a type of natural refrigerants with propane (R290), isobutane (R600A), propylene (R1270) and other hydrocarbons as the main components. This type of refrigerant has attracted much attention in recent years due to its excellent environmental protection characteristics: its ozone depletion potential (ODP) is zero, and its global warming potential (GWP) is extremely low (for example, the GWP of R290 is only 3, which is much lower than the 2088 of the traditional refrigerant R410A), which fully complies with the requirements of international environmental regulations on reducing greenhouse gas emissions. In addition, hydrocarbon refrigerants have excellent thermodynamic properties and high energy efficiency ratio (COP), which can significantly reduce system energy consumption and are suitable for household refrigerators, small air conditioners and commercial refrigeration equipment. However, its highly flammable and explosive characteristics (such as the explosion limit of R290 is 2.1% to 9.5%) place strict requirements on safety design. The equipment must use explosion-proof electrical components, strict sealing technology, and limit the filling amount (for example, the IEC standard stipulates that the filling amount of household refrigerators should not exceed 150 grams). Despite the safety challenges, hydrocarbon refrigerants have been used on a large scale in Europe, India and other places, and have gradually expanded to the fields of cold chain logistics and heat pumps as technology advances.

[0037] Halogen refrigerants are compounds containing halogen elements (such as fluorine, chlorine, bromine, etc.) and have been widely used in refrigeration and air-conditioning systems. This type of refrigerant mainly includes chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs). Among them, R22 (chlorodifluoromethane) is one of the most common halogen refrigerants and has a good refrigeration effect, but because of its high potential for depleting the ozone layer, it is gradually being replaced according to the relevant provisions of the Montreal Protocol. R134a (tetrafluoroethane) is also an important halogen refrigerant with a low potential for depleting the ozone layer, but a high global warming potential. The working principle of halogen refrigerants is to use their phase change characteristics at different temperatures and pressures to achieve the absorption and release of heat, thereby achieving the effect of refrigeration. They are circulated in the refrigeration system and the refrigeration cycle is completed through the coordinated work of components such as the compressor, condenser, expansion valve and evaporator. The application of halogen refrigerants is not limited to air conditioners and refrigerators, but is also widely used in industrial refrigeration, commercial refrigeration equipment, and automotive air conditioning systems. However, due to its potential harm to the environment, many countries and regions are working to reduce the use of halogen refrigerants and promote more environmentally friendly alternatives.

[0038] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0039] Example 1

[0040] An embodiment of the present application provides a multi-channel refrigerant leakage detector that can accurately detect the leakage of multiple refrigerants without replacing the sensor. Figure 1-Figure 3 The multi-channel refrigerant leak detector of the present application is described in detail, including:

[0041] A gas inlet, a gas outlet and a gas absorption chamber 6 arranged between the gas inlet and the gas outlet, the gas inlet end and the gas outlet end of the gas absorption chamber 6 are respectively provided with an infrared black body light source 2 and a multi-channel infrared detector 11.

[0042] In this embodiment, the multi-channel infrared detector 11 is a three-channel infrared detector, and the three detection channels are respectively a carbon dioxide detection channel, a hydrocarbon refrigerant detection channel, and a halogen refrigerant detection channel, wherein the carbon dioxide detection channel is configured to detect carbon dioxide gas, and the corresponding filter is a filter with a central wavelength of 4.26μm and a bandwidth of 180nm; the hydrocarbon refrigerant detection channel is configured to detect two hydrocarbon refrigerants, R290 and R600A, and the corresponding filter is a filter with a central wavelength of 3.4μm and a bandwidth of 120nm; the halogen refrigerant detection channel is configured to detect two halogen refrigerants, R12 and R22, and the corresponding filter is a filter with a central wavelength of 8.6μm and a bandwidth of 150nm.

[0043] It is understandable that an air pump will be provided between the gas inlet and the gas outlet of the multi-channel refrigerant leak detector to draw the gas to be tested from the gas inlet into the absorption chamber.

[0044] In other embodiments, the center wavelength parameter and bandwidth parameter of each filter can be adjusted before leaving the factory according to the detection accuracy and the center wavelength of the refrigerant to be detected.

[0045] It should be noted that the filter with a central wavelength of 3.4 μm and a bandwidth of 120 nm used in the hydrocarbon refrigerant detection channel in this embodiment can accurately detect both R290 refrigerant and R600A refrigerant because the central wavelengths of R290 and R600A are both 3.4 μm.

[0046] The multi-channel infrared detector 11 is connected to a control unit 100, which is used to select the detection channel corresponding to the type of refrigerant gas to be detected in the multi-channel infrared detector 11 when leak detection is performed on the gas at the gas inlet, and generate a detection result based on the detection signal of the detection channel.

[0047] It can be understood that the detection result of the embodiment of the present application is a qualitative detection result, that is, the detection result of whether there is refrigerant at the gas inlet of the refrigerant leak detector is judged by the change of the detection signal. When the change of the detection signal meets the set change threshold (obtained and set through tests before leaving the factory), it is considered that there is a leak.

[0048] It can be understood that the detection signal in the embodiment of the present application is a light intensity signal detected by the multi-channel infrared detector 11.

[0049] In this embodiment, the multi-channel infrared detector 11 and the control unit 100 are further provided with:

[0050] The switch 102 is connected to the multi-channel infrared detector 11 and the control unit 100, and is used to select the channel through which the multi-channel infrared detector 11 outputs the detection signal;

[0051] The filter amplifier circuit 103 is connected to the switch 102 and is used for filtering and amplifying the detection signal and then outputting the result to the control unit 100 .

[0052] The acceleration sensor 107 is connected to the control unit 100 and is used to detect the acceleration of the refrigerant leak detector, judge the abnormal operation of the detection gesture in real time, determine the validity of the detection signal, reduce the risk of false alarms, and achieve more accurate and intelligent detection. From the perspective of ergonomics and instrument operation requirements, the normal use acceleration can be 0.5-2m / s 2, when the acceleration is greater than 3.5m / s 2 There is a certain probability of false alarm, so when the acceleration is detected to be greater than 3.5m / s 2 In this case, the detection signal is not considered valid and no measurement result is generated.

[0053] In this embodiment, by adjusting the emission angle of the infrared blackbody light source 2 and the distance from the gas absorption chamber 6, at least 80% of the infrared light emitted by the infrared blackbody light source 2 enters the gas absorption chamber 6, and at least 80% of the infrared light after passing through the gas absorption chamber 6 is irradiated on the multi-channel infrared detector 11 to ensure detection accuracy.

[0054] In this embodiment, the infrared blackbody light source 2 is configured to be driven by a constant power driving circuit 106. Figure 3 It is a structural diagram of a constant power driving circuit of an infrared blackbody light source. Figure 3 As shown, the constant power driving circuit 106 includes:

[0055] The DC-DC chip U2, model FP6298, includes an EN terminal, a PGND terminal, an OC terminal, a VCC terminal, a LX terminal, a NC terminal, a FB terminal and a GND terminal, wherein the PGND terminal (input power ground) is connected to the power node VBAT via the seventh capacitor C7; the PGND terminal (input power ground) is also connected to the GND node; the OC terminal (overcurrent protection terminal) is connected to the GND node via the tenth resistor R10; the VCC terminal is connected to the power node VBAT; the EN terminal (enable terminal) is connected to the power node VBAT and is controlled by the control unit; the LX terminal (switch MOS terminal) is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the FB terminal (feedback input terminal) via the third capacitor C3; the NC terminal is suspended; the FB terminal is grounded via the sampling resistor R2; and the GND terminal (output ground terminal) is connected to the GND node.

[0056] The first capacitor C1 is arranged between the power node VBAT and the GND node.

[0057] The fourth capacitor C4 is connected in parallel at both ends of the seventh capacitor C7.

[0058] The first inductor L1 is arranged between the power node VBAT and the anode of the first diode D1.

[0059] The monitoring chip U1, model MAX421, includes a GND terminal, an IN terminal, two NC terminals, a VCC terminal, a POUT terminal, an RS- terminal and an RS+ terminal; wherein the GND terminal is connected to the GND node; the VCC terminal is connected to the power supply node VBAT; a second capacitor C2 is also provided between the GND terminal and the VCC terminal; the IN terminal is connected to the GND node via the ninth capacitor C9; the POUT terminal is connected to the FB terminal of the DC-DC chip via the first resistor R1; the RS- terminal is connected to the GND node via the eleventh resistor R11 and the ninth resistor R9; and the RS+ terminal is connected to the cathode of the first diode D1;

[0060] The thirty-fifth resistor R35 has its two ends connected to the cathode of the first diode D1 and the light source voltage node P_5V respectively. The light source voltage node P_5V is also connected to the RS-terminal. A fifth capacitor C5 and a sixth capacitor C6 are also connected in parallel between the light source voltage node P_5V and the GND node.

[0061] The working principle of the constant power driving circuit 106 is as follows:

[0062] The control unit enables the EN pin of the DC-DC chip. When EN is set high, the sixth resistor R6 and the 12th capacitor C12 perform resistance-capacitance filtering, making the signal smoother and the output voltage correspondingly smoother. At the same time, the current flowing through the infrared black body light source 2 is detected through the sampling resistor R2. If the current is too large, feedback adjustment is performed through the monitoring chip MAX4210, and the Upout becomes larger, making the voltage of the FB pin of the DC-DC chip larger, and the voltage at the output end of the DC-DC chip is adjusted to decrease. If the current detected by the sampling resistor R2 is too small, the Upout voltage of the monitoring chip is reduced, resulting in a decrease in the voltage of the FB pin of the DC-DC chip, so that the DC-DC chip outputs a larger voltage to maintain the power of the light source. In addition, the control unit 100 is used to detect the Upout voltage signal. If the signal is abnormal, the single-chip microcomputer switches the enable terminal EN pin, and the DC-DC chip stops supplying power to the light source to protect the infrared black body light source 2.

[0063] In this embodiment, the constant power driving circuit 106 adds a soft start to avoid power supply voltage oscillation caused by power-on moment, and also adds an RC resistor-capacitor filter to prevent the peak current from damaging the infrared blackbody light source 2.

[0064] In some other implementations, the constant power driving circuit 106 may also be other constant power driving circuits provided with RC resistor-capacitor filtering and soft start to ensure stable operation of the infrared blackbody light source.

[0065] It will be appreciated that the brightness of the infrared blackbody light source may be controlled using pulse width modulation techniques.

[0066] In this embodiment, a power supply 108 and a voltage reference unit 104 are further configured to provide power supply and reference voltage for the control unit.

[0067] In this embodiment, a front cover and a rear cover 14 are respectively provided at both ends of the gas absorption chamber 6, a first PCB board 1 is provided on the front cover, an infrared blackbody light source 2 and a constant power driving circuit 106 are provided on the first PCB board 1, a second PCB board 12 is provided on the rear cover 14, the multi-channel infrared detector 11 is provided on the second PCB board 12, a third PCB board 5 is provided on the upper part of the gas absorption chamber 6, a control unit 100 is provided on the third PCB board 5, the first PCB board 1 and the second PCB board 12 are both connected to the third PCB board 5, and the front cover and the rear cover 14 are fixed with screws 13.

[0068] In the present embodiment, the gas absorption chamber 6 is surrounded by the first shield cover 4 and the second shield cover 8 .

[0069] In this embodiment, a top foam 9 is arranged between the gas absorption chamber 6 and the first shielding cover 4, a measuring foam 3 is arranged between the gas absorption chamber 6 and the infrared blackbody light source 2, a bottom foam 7 is arranged between the gas absorption chamber 6 and the second shielding cover 8, and a sealing ring 10 is also arranged between the gas absorption chamber 6 and the infrared detector 11.

[0070] In this embodiment, a communication unit 105, namely a Bluetooth module, is further provided. The Bluetooth module is connected to the control unit 100 and is used to transmit the detection result via Bluetooth.

[0071] In some other embodiments, the communication unit 105 may also use other wired or wireless communication modules to transmit the detection results to other terminals to facilitate users to view the detection results.

[0072] It is understandable that the Bluetooth module can be connected to the mobile APP, which can not only prepare for subsequent product upgrades, but also save detection data when users use it, making the product smarter and more convenient.

[0073] A detection method of the present application embodiment is as follows:

[0074] When using the refrigerant leak detector to detect various points where carbon dioxide refrigerant leakage may exist, first turn on the power to warm up the entire refrigerant leak detector for 30 seconds, and turn on the air pump and infrared blackbody light source at the same time; read the acceleration signal in real time; control the selection of the carbon dioxide detection channel of the multi-channel infrared detector, collect the detection signal of the carbon dioxide detection channel in real time, and use the filter amplifier circuit to filter and amplify it before outputting it to the control unit; align the gas inlet of the refrigerant leak detector with the points one by one, and the control unit determines whether there is carbon dioxide leakage at each point based on the changes in the real-time detection signal, and gives the detection result of whether there is leakage.

[0075] Example 2

[0076] An embodiment of the present application provides a multi-channel refrigerant leakage detector, which can accurately detect the leakage of multiple refrigerants without replacing the sensor. The difference between the embodiment 2 of the present application and the embodiment 1 is that:

[0077] In this embodiment, the multi-channel infrared detector 11 is a four-channel infrared detector, and the four channels are respectively a reference channel, a carbon dioxide detection channel, a hydrocarbon refrigerant detection channel, and a halogen refrigerant detection channel; wherein the carbon dioxide detection channel is configured to detect carbon dioxide gas, and the corresponding filter is a filter with a central wavelength of 4.26μm and a bandwidth of 180nm; the hydrocarbon refrigerant detection channel is configured to detect two hydrocarbon refrigerants, R290 and R600A, and the corresponding filter is a filter with a central wavelength of 3.4μm and a bandwidth of 120nm; the halogen refrigerant detection channel is configured to detect two halogen refrigerants, R12 and R22, and the corresponding filter is a filter with a central wavelength of 8.6μm and a bandwidth of 150nm; the filter corresponding to the reference channel is a filter with a central wavelength of 3.95μm and a bandwidth of 91nm.

[0078] In this embodiment, the control unit 100 is also used to sequentially select the reference channel of the multi-channel infrared detector and the detection channel corresponding to the type of refrigerant gas to be tested when leak detection is performed on the gas at the gas inlet, and generate quantitative detection results based on the detection signals of the reference channel and the detection channel.

[0079] In this embodiment, since different bands absorb different light intensities, the control unit 100 can also measure the leakage degree of the refrigerant gas according to the ratio of the detection signal of the selected detection channel to the detection signal of the reference channel as a quantitative detection result.

[0080] In other embodiments, before leaving the factory, the relationship between the detection signal of each detection channel and the detection signal of the reference channel and the concentration of the refrigerant being tested can be fitted through experiments. Then, during actual testing, the concentration value of the refrigerant being tested can be calculated and generated as the test result based on the detection signal of the reference channel detected in real time and the detection signal of the selected detection channel.

[0081] See also Figure 4 ,in, Figure 4 a is the relationship between the detection signal changes of the carbon dioxide detection channel when a certain concentration of carbon dioxide is used as the gas to be detected, and a schematic diagram of the detection signal changes of the carbon dioxide detection channel; Figure 4 b is the acceleration 4m / s 2 Schematic diagram of the change of detection signal of the carbon dioxide detection channel under certain conditions; Figure 4 c is a schematic diagram of the change of the detection signal of the reference channel when the same concentration of carbon dioxide is used as the test gas;

[0082] Figure 4 d is a schematic diagram of the change of the detection signal of the hydrocarbon refrigerant detection channel when the same concentration of carbon dioxide is used as the gas to be tested; Figure 4 a and Figure 4 b shows that when the carbon dioxide detection channel is not fed with the gas to be tested, the speed is only 4m / s. 2 Under these conditions, it can produce Figure 4 A similar detection signal, therefore, it is necessary to detect the acceleration of the refrigerant leak detector to detect the acceleration greater than 3.5m / s 2 In this case, the detected detection signal is not considered valid and no detection result is generated.

[0083] A detection method of the present application embodiment is as follows:

[0084] When using the refrigerant leak detector to detect various points where carbon dioxide refrigerant leakage may exist, first turn on the power to warm up the entire refrigerant leak detector for 30 seconds, turn on the air pump, and pulse-width modulate the infrared blackbody light source; read the acceleration signal in real time; then align the gas inlet of the refrigerant leak detector with the points one by one to start detection. When detecting each point, the control sequentially selects the reference channel and the carbon dioxide detection channel of the multi-channel infrared detector, and the circuit board analog switch performs electronic switching; the detection signals are collected and filtered and amplified by the filter amplifier circuit, and then enter the control unit for processing; the control unit generates a quantitative detection result of the point according to the ratio of the detection signal of the selected carbon dioxide channel and the detection signal of the reference channel.

[0085] The above description is only a partial embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

[0086] In addition, although each operation is described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0087] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A multi-channel refrigerant leak detector, characterized in that: It includes a gas inlet, a gas outlet and a gas absorption chamber arranged between the gas inlet and the gas outlet; the gas inlet end and the gas outlet end of the gas absorption chamber are respectively provided with an infrared blackbody light source and a multi-channel infrared detector, the multi-channel infrared detector includes at least two detection channels, the filters corresponding to each detection channel of the multi-channel infrared detector are respectively configured to be suitable for detecting a refrigerant gas, the multi-channel infrared detector is connected to a control unit, the control unit is used to select the detection channel corresponding to the type of refrigerant gas to be detected in the multi-channel infrared detector when leak detection is performed on the gas at the gas inlet, and generate qualitative detection results according to the detection signals of the detection channels.

2. The multi-channel refrigerant leak detector according to claim 1, characterized in that: The multi-channel infrared detector includes at least two of the following detection channels: a carbon dioxide detection channel configured to detect carbon dioxide gas; A hydrocarbon refrigerant detection channel configured to detect at least one hydrocarbon refrigerant gas; The halogen refrigerant detection channel is configured to detect at least one halogen refrigerant gas.

3. The multi-channel refrigerant leak detector according to claim 1, characterized in that: The multi-channel infrared detector also includes a reference channel. The control unit is also used to sequentially select the reference channel of the multi-channel infrared detector and the detection channel corresponding to the type of refrigerant gas to be tested when leak detection is performed on the gas at the gas inlet, and generate quantitative detection results based on the detection signals of the reference channel and the detection channel.

4. The multi-channel refrigerant leak detector according to claim 1, characterized in that: Also provided between the multi-channel infrared detector and the control unit is: A switch, connected to the multi-channel infrared detector and the control unit, for selecting a channel through which the multi-channel infrared detector outputs a detection signal; The filter amplifier circuit is connected to the switch and is used for filtering and amplifying the detection signal and then outputting it to the control unit.

5. The multi-channel refrigerant leak detector according to claim 1, characterized in that: Also includes: An acceleration sensor is connected to the control unit and is used to detect the acceleration of the refrigerant leakage detector.

6. The multi-channel refrigerant leak detector according to claim 1, characterized in that: At least 80% of the infrared light emitted by the infrared blackbody light source enters the gas absorption chamber, and at least 80% of the infrared light after passing through the gas absorption chamber is irradiated onto the infrared detector.

7. The multi-channel refrigerant leak detector according to claim 1, characterized in that: The infrared blackbody light source is configured to be driven by a constant power driving circuit.

8. The multi-channel refrigerant leak detector according to claim 1, characterized in that: The gas absorption chamber is wrapped by two shielding covers.

9. The multi-channel refrigerant leak detector according to claim 1, characterized in that: It also includes a Bluetooth module, which is connected to the control unit and is used to transmit the detection result via Bluetooth.

10. A refrigerant leakage detection method, applied to the multi-channel refrigerant leakage detector according to any one of claims 1 to 9, characterized in that: The method comprises: According to the type of gas to be detected, the reference channel of the multi-channel infrared detection and the detection channel corresponding to the gas type are selected in sequence; The concentration of the gas to be measured is generated based on the detection signal of the reference channel and the detection signal of the gated detection channel.

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