Air conditioning device

Abstract

The air conditioning device comprises a refrigerant detection system, the refrigerant detection system comprises a light source, a dual-channel detector and a controller, the dual-channel detector comprises a test channel and a reference channel, the test channel comprises a narrow-band optical filter, the reference channel comprises a notch optical filter, and the controller is connected with the narrow-band optical filter. The central wavelength of the narrow-band filter and the central wavelength of the notch filter are the same as the central wavelength of the target gas; the controller is used for acquiring the current output voltage of the test channel and the current output voltage of the reference channel, judging whether target gas exists according to the current output voltage of the test channel, and judging whether interference gas exists according to the current output voltage of the reference channel. Only light with the same central wavelength can pass through the narrow-band light filter, namely light with the same absorption wavelength as the target gas can pass through the narrow-band light filter, light with the same central wavelength can not pass through the notch light filter, light with other wavelengths can pass through the notch light filter, and whether target gas exists or not can be judged through the narrow-band light filter. Whether interference gas exists or not can be judged through the notch filter.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning devices, and in particular to an air-conditioning device with a refrigerant leakage detection function. Background Art

[0002] Existing gas concentration detection devices generally include two channels. One channel serves as a test channel, and the center wavelength of the filter in this channel matches the characteristic absorption peak of the target gas. The other channel serves as a reference channel, and the center wavelength of the filter in this channel needs to avoid the characteristic absorption peaks of the target gas and common gases. When the target gas is present, the target gas absorbs infrared light within its own characteristic absorption spectrum, which weakens the light energy incident on the infrared sensor test channel, causing the output signal of the infrared sensor test channel to decrease. Because the center wavelength of the reference channel filter is inconsistent with the characteristic absorption peak of the target gas, the target gas does not absorb infrared light of this center wavelength, so the light energy incident on the infrared sensor reference channel remains almost unchanged, and the output signal of the infrared sensor reference channel also remains almost unchanged. Generally, the output signal of the infrared sensor reference channel is used as a benchmark, and the output signal of the test channel is compared and analyzed with the output signal of the reference channel to obtain the target gas concentration.

[0003] However, if the characteristic absorption peaks of the interfering gas and the target gas are close, the gas concentration detection technology can also detect the gas concentration. However, it cannot distinguish the gas type and mistakenly identifies the interfering gas as the target gas, thus causing a false alarm and causing panic among air conditioner users.

[0004] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0005] The present invention provides an air-conditioning device, which solves the technical problem that the refrigerant detection system of the existing air-conditioning device cannot distinguish between target gas and interfering gas.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: An air conditioning device includes a refrigerant detection system, the refrigerant detection system comprising: light source; A dual-channel detector comprising a test channel and a reference channel, wherein the test channel comprises a narrowband filter, the reference channel comprises a notch filter, and the central wavelengths of the narrowband filter and the notch filter are both the same as the central wavelength of the target gas; The controller is used to obtain the current output voltage of the test channel and the current output voltage of the reference channel, determine whether the target gas exists according to the current output voltage of the test channel, and determine whether the interfering gas exists according to the current output voltage of the reference channel.

[0007] In some embodiments of the present invention, the controller is used to determine the presence of target gas when the current output voltage of the test channel does not exceed the set test voltage; to determine the presence of interfering gas when the current output voltage of the reference channel does not exceed the set reference voltage; and to determine the absence of interfering gas when the current output voltage of the reference channel exceeds the set reference voltage, wherein the set test voltage and the set reference voltage are predetermined values.

[0008] In some embodiments of the present invention, when the controller determines that there is a target gas and no interfering gas, the controller is used to calculate the difference between the current output voltage of the test channel and the current output voltage of the reference channel, and the controller is used to calculate the target gas concentration based on the difference.

[0009] In some embodiments of the present invention, the controller is used to obtain the fitting relationship between the difference between the test channel output voltage and the reference channel output voltage and the target gas concentration, which is determined in advance based on experiments, and obtain the fitting coefficient. The controller is used to calculate the target gas concentration based on the difference and the fitting coefficient.

[0010] In some embodiments of the present invention, the test channel output voltage V r and the reference channel output voltage V m The fitting relationship between the difference and the target gas concentration c is V r -V m = a1*c + b1, get the fitting coefficients a1 and b1, the controller calculates the target gas concentration c=(V r当前 -V m当前 -b1) / a1.

[0011] In some embodiments of the present invention, when the controller determines that there is a target gas and an interfering gas, the controller is used to calculate the test channel voltage difference between the current output voltage of the test channel and the test channel output voltage when only the target gas is present, and calculate the reference channel voltage difference between the current output voltage of the reference channel and the reference channel output voltage when only the target gas is present. The controller is used to calculate the target gas concentration based on the difference between the test channel voltage difference and the reference channel voltage difference.

[0012] In some embodiments of the present invention, the controller is used to obtain the fitting relationship between the difference between the test channel voltage difference and the reference channel voltage difference determined in advance based on the experiment and the target gas concentration, and obtain the fitting coefficient. The controller is used to calculate the target gas concentration based on the difference between the test channel voltage difference and the reference channel voltage difference and the fitting coefficient.

[0013] In some embodiments of the present invention, the fitting relationship between the difference between the test channel voltage difference and the reference channel voltage difference determined in advance according to the experiment and the target gas concentration c is: |V r1 -V r2 |-|V m1 -V m2 |=a2*c+b2, get the fitting coefficients a2 and b2, the controller calculates the target gas concentration c=(|V r目标 -V r当前 |-|V m目标 -V m当前 |-b2) / a2.

[0014] In some embodiments of the present invention, the output voltage of the test channel is the average value obtained by summing the multiple electrical signals collected by the test channel by the controller; the output voltage of the reference channel is the average value obtained by summing the multiple electrical signals collected by the reference channel by the controller.

[0015] In some embodiments of the present invention, the air-conditioning device includes an alarm device, and the controller is used to control the alarm device to alarm when it is determined that the target gas exists; or, the controller is used to calculate the concentration of the target gas and control the alarm device to alarm when the target gas concentration exceeds a set concentration.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: an air-conditioning device includes a refrigerant detection system, the refrigerant detection system includes a light source, a dual-channel detector and a controller, the dual-channel detector includes a test channel and a reference channel, the test channel includes a narrowband filter, the reference channel includes a notch filter, the center wavelengths of the narrowband filter and the notch filter are the same as the center wavelength of the target gas; the controller is used to obtain the current output voltage of the test channel and the current output voltage of the reference channel, and determine whether the target gas exists based on the current output voltage of the test channel, and determine whether the interfering gas exists based on the current output voltage of the reference channel. The narrowband filter can only allow light with the same center wavelength to pass, that is, light with the same absorption wavelength as the target gas to pass, and the notch filter can prevent light with the same center wavelength from passing, while light of other wavelengths can pass. Therefore, the narrowband filter can determine whether the target gas exists, and the notch filter can determine whether the interfering gas exists.

[0017] Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 Schematic diagram of a dual-channel detector.

[0020] Figure 2 Schematic diagram of the waveform of a narrowband filter.

[0021] Figure 3 Schematic diagram of the waveform of the notch filter.

[0022] Figure 4 This is the structural diagram of the refrigerant detection system.

[0023] Figure 5 This is the functional block diagram of the refrigerant detection system.

[0024] Figure 6 Flowchart for determining the presence of target gas and interfering gas for an air conditioning unit.

[0025] Figure 7 A flow chart for determining the fitting coefficient of the fitting relationship between the difference between the test channel output voltage and the reference channel output voltage and the target gas concentration.

[0026] Figure 8 Flowchart for calculating target gas concentration when target gas is present and no interfering gas is present.

[0027] Figure 9 A flow chart for determining a fitting coefficient for a fitting relationship between a test channel voltage difference and a reference channel voltage difference and a target gas concentration.

[0028] Figure 10 Flowchart for calculating target gas concentration in the presence of target gas and interfering gas.

[0029] Figure 11 This is a flow chart for refrigerant detection in air conditioning units. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] The air conditioning system performs the refrigeration cycle of the air conditioning system by using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0037] The compressor compresses low-temperature, low-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0038] The throttling device expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioning system regulates the temperature of the indoor space.

[0039] The outdoor unit of the air conditioning system refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioning system includes an indoor heat exchanger, and a throttling device may be provided in the indoor unit or the outdoor unit.

[0040] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioning system functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioning system functions as a cooler in cooling mode.

[0041] R32 refrigerant is considered a new generation refrigerant due to its high energy efficiency, moderate cost, low toxicity, zero ozone depletion, and low greenhouse effect. However, R32 refrigerant has an A2L flammability rating, and its low flammability leads to potential safety issues in its production and application.

[0042] When the system vacuum level does not meet the standard during safety maintenance, or when the refrigerant leaks and encounters open flames, electric sparks, poor ventilation, etc., the combustible refrigerant components come into contact with the oxidant, and an explosion accident may occur under different oxygen concentration conditions.

[0043] In order to ensure the safety of the use of flammable refrigerants, the refrigerants should be monitored and an alarm signal should be issued in the event of a refrigerant leak. Currently, NDIR gas concentration detection technology is not prone to poisoning and has been widely used in the field of refrigerant monitoring. NDIR gas concentration detection technology mainly utilizes the characteristic absorption spectrum of gases to achieve gas concentration detection. That is, when infrared light passes through the gas, when the vibration frequency of a certain group in the gas molecules is consistent with the frequency of infrared light, the gas molecules will absorb the infrared light of that frequency, thereby forming an absorption peak at that frequency point. Due to the different chemical bonds between atoms in different molecules, the infrared absorption peaks of different gases are also different. Based on the above working principle, the NDIR gas concentration detection module mainly tests a single gas, and other gases have little effect on the test results of the target gas. It has the characteristics of high test accuracy and low false alarm rate, and is widely used in the field of gas concentration testing.

[0044] NDIR gas concentration detection technology primarily involves an infrared light source, an infrared sensor, and circuitry. Infrared light emitted by the infrared light source is incident on the infrared sensor, generating an electrical signal. This signal is then processed by the circuitry to output a signal related to the gas concentration. The infrared light source typically uses a broadband source. The infrared sensor typically employs two channels: one channel serves as a test channel, whose filter center wavelength matches the characteristic absorption peak of the target gas; the other channel serves as a reference channel, whose filter center wavelength avoids the characteristic absorption peaks of the target gas and common gases. When a target gas is present, it absorbs infrared light within its characteristic absorption spectrum, weakening the light energy incident on the infrared sensor's test channel and reducing the output signal from the test channel. Because the center wavelength of the reference channel's filter does not match the target gas's characteristic absorption peak, the target gas does not absorb infrared light at this center wavelength. As a result, the light energy incident on the reference channel remains largely unchanged, and so does the output signal from the reference channel. The output signal of the reference channel is typically used as a baseline, and the test channel output signal is compared and analyzed with the reference channel output signal to determine the target gas concentration.

[0045] However, if the characteristic absorption peaks of the interfering gas and the target gas are similar, the NDIR gas concentration detection technology will also detect the gas concentration, but will not be able to distinguish the gas type, and will mistake the interfering gas for the target gas, thus causing a false alarm and causing panic among air conditioner users.

[0046] In order to avoid the influence of interfering gases on the target gas, the refrigerant detection system of the air-conditioning unit is improved so that it can distinguish between target gas and interfering gas, and the concentration of the target gas can be calculated even when the type of interfering gas is unknown.

[0047] An air-conditioning device includes a refrigerant detection system. The refrigerant detection system is installed in the air-conditioning device and is used to detect whether the refrigerant of the air-conditioning device is leaking.

[0048] In some embodiments, the refrigerant detection system is installed in the indoor unit of the air-conditioning device and is close to the refrigerant circulation pipeline. For example, the refrigerant detection system is close to the indoor heat exchanger.

[0049] In some embodiments, the refrigerant detection system is installed in the outdoor unit of the air-conditioning device and is close to the refrigerant circulation pipeline. For example, the refrigerant detection system is close to the outdoor heat exchanger.

[0050] In some embodiments, the refrigerant detection system is installed in the indoor unit and the outdoor unit of the air conditioning device and is close to the refrigerant circulation loop. For example, the refrigerant detection system is close to the indoor heat exchanger and the outdoor heat exchanger.

[0051] The target gas is the refrigerant, and the interference gas is other gases except the refrigerant.

[0052] The refrigerant detection system can distinguish between target gas and interfering gas.

[0053] exist Figure 1 、 4 In the example of 5, the refrigerant detection system includes a light source, a dual-channel detector and a controller.

[0054] Light sources are used to provide lighting.

[0055] In some embodiments, the light source is a broad spectrum light source.

[0056] In some embodiments, the light source is a MEMS blackbody light source.

[0057] In some embodiments, the light source is a SMD blackbody light source.

[0058] exist Figure 1 In the example shown in FIG, a dual-channel detector includes two channels, one channel is a test channel and the other channel is a reference channel.

[0059] exist Figure 2 In the example of FIG, the test channel includes a narrowband filter, and the central wavelength λ of the narrowband filter is the atmospheric window of the target gas.

[0060] exist Figure 3 In the example of FIG, the reference channel includes a notch filter, and the center wavelength λ of the notch filter is the atmospheric window of the target gas.

[0061] That is, the central wavelength λ of the narrowband filter and the notch filter are both the same as the central wavelength λ of the target gas.

[0062] The negative electrodes of the test channel and the reference channel are both connected to the ground.

[0063] The controller is used to obtain the current output voltage V of the test channel r当前 and the reference channel current output voltage V m当前 , according to the current output voltage V of the test channel r当前 Determine whether there is target gas, based on the current output voltage V of the reference channel m当前 Determine whether there is interfering gas.

[0064] In some embodiments, the air conditioning device includes an alarm device, and the controller is connected to the alarm device. The controller is used to control the alarm device to alarm when it is determined that the target gas exists.

[0065] The narrowband filter only allows light with the same central wavelength to pass through, so the current output voltage V r当前 Determine whether there is target gas; the notch filter can prevent light with the same wavelength as the center from passing through, so the current output voltage V of the reference channel can be used to determine ... m当前 Determine whether there is interfering gas.

[0066] exist Figure 5 In the example, the refrigerant detection system includes a filter amplifier circuit and an A / D conversion circuit, and the output of the dual-channel detector is connected to the controller through the filter amplifier circuit and the A / D conversion circuit in sequence.

[0067] The filter amplifier circuit and the A / D conversion circuit are both dual-channel.

[0068] The controller is also connected to a communication interface to communicate with external devices.

[0069] In some embodiments, the communication interface circuit may be RS485 communication, serial communication, etc.

[0070] The controller is connected to the light source and can adjust the output of the light source.

[0071] The light output by the light source is vertically incident on the dual-channel detector, which generates two analog electrical signals.

[0072] The two channels of the dual-channel detector are respectively connected to the two channel input terminals of the filter amplifier circuit to perform filtering and amplification processing on the analog electrical signals.

[0073] The two output terminals of the filter amplifier circuit are respectively connected to the two input terminals of the A / D conversion circuit. After the analog electrical signal is filtered and amplified, it is transmitted to the A / D conversion circuit to realize the conversion between the analog electrical signal and the electronic signal.

[0074] The output end of the A / D conversion circuit is connected to the controller. The A / D conversion circuit transmits the converted digital electrical signal to the controller. The controller calibrates the collected electrical signal to obtain the current output voltage V of the test channel. r当前 and the reference channel current output voltage V m当前 .

[0075] In some embodiments, the current output voltage V r当前 The controller sums up multiple electrical signals collected by the test channel and takes the average value.

[0076] In some embodiments, the output voltage V m当前 The controller sums up multiple electrical signals collected by the reference channel and takes the average value.

[0077] The controller is used to test the current output voltage V r当前 When the set test voltage is not exceeded, it is determined that the target gas exists.

[0078] The narrowband filter can only allow light with the same central wavelength λ to pass through, that is, light with the same absorption wavelength λ as the target gas. When there is no target gas, the output of the test channel remains basically unchanged. When there is a target gas, the target gas can absorb the light with the same central wavelength λ as the narrowband filter, so that the light intensity incident on the test channel is reduced, and the output voltage of the test channel becomes lower.

[0079] Therefore, a set test voltage is determined, and the current output voltage V r当前 When the test voltage does not exceed the set value, the target gas is determined to be present. When the test channel output remains substantially constant, the target gas is determined not to be present. Set the test voltage to a value less than the constant value.

[0080] The controller is used to output the current voltage V in the reference channel m当前 When the set reference voltage is not exceeded, it is determined that interfering gas exists.

[0081] The controller is used to output the current voltage V in the reference channel m当前 When the set reference voltage is exceeded, it is determined that there is no interfering gas.

[0082] A notch filter rejects light with a central wavelength λ, while allowing light of all other wavelengths to pass. Because the notch filter's central wavelength λ matches the target gas's absorption wavelength λ, the presence or absence of target gas has no effect on the reference channel's output. However, the presence of an interfering gas, which absorbs light at different wavelengths than the target gas, will absorb the light, reducing the intensity of light incident on the reference channel and causing the reference channel's output voltage to drop.

[0083] Therefore, when the controller sets the reference voltage, the current output voltage of the reference channel Vm当前 When the reference voltage does not exceed the set value, it is determined that there is interfering gas. m当前 When the set reference voltage is exceeded, it is determined that there is no interfering gas.

[0084] The controller is used to test the current output voltage V r当前 Does not exceed the set test voltage, the current output voltage of the reference channel V m当前 When the set reference voltage is exceeded, it is determined that the target gas and the interfering gas are present.

[0085] The test voltage and the reference voltage are set to predetermined values.

[0086] The method for determining the set test voltage and the set reference voltage is: Different concentrations of target gases are filled into the calibration gas chamber. The test channel and reference channel of the dual-channel detector output electrical signals respectively. After circuit processing, they enter the controller. In order to reduce the influence of noise, the controller accumulates N data collected by each channel one by one and takes the average value as the set test voltage and set reference voltage.

[0087] exist Figure 6 In the example, the process of the refrigerant detection system of the air conditioner detecting whether the refrigerant is leaking and issuing an alarm includes the following steps: S1. Start.

[0088] S2. The controller controls the light source to emit light.

[0089] S3. The controller receives the current output voltage of the test channel output by the test channel and the current output voltage of the reference channel output by the reference channel of the dual-channel detector.

[0090] S4. Compare the current output voltage of the test channel with the set test voltage, and compare the current output voltage of the reference channel with the set reference voltage.

[0091] When the current output voltage of the test channel does not exceed the set test voltage, the process goes to step S5.

[0092] When the current output voltage of the test channel exceeds the set test voltage, the process goes to step S6.

[0093] When the current output voltage of the reference channel does not exceed the set reference voltage, the process proceeds to step S7.

[0094] When the current output voltage of the reference channel exceeds the set reference voltage, the process goes to step S8.

[0095] S5. Determine whether the target gas exists.

[0096] S6. Determine whether the target gas does not exist.

[0097] S7. Determine whether there is interfering gas.

[0098] S8. Determine whether there is no interfering gas.

[0099] In some embodiments, in order to accurately obtain the concentration value of the target gas, the controller is further configured to calculate the concentration value of the target gas.

[0100] In some embodiments, the air conditioning device includes an alarm device, and the controller is used to calculate the target gas concentration. The controller controls whether the alarm device alarms according to the target gas concentration value.

[0101] In some embodiments, the controller is configured to control the alarm device to sound an alarm when the target gas concentration exceeds a set concentration.

[0102] In some embodiments, the controller is connected to a communication interface circuit to enable the target gas concentration value to be output externally.

[0103] In some embodiments, the controller outputs the target gas concentration value to the user end through the communication interface circuit, such as a terminal APP, a remote control, a wired controller, etc., to remind the user to handle it.

[0104] Since there may be or may not be interfering gas when the target gas leaks, the method for the controller to calculate the target gas concentration is divided into two different calculation methods: one in which there is no interfering gas and the other in which there is interfering gas.

[0105] When there is target gas but no interfering gas, the target gas concentration is calculated as follows: When the controller determines that the target gas exists and no interfering gas exists, the controller is used to obtain the current output voltage V of the test channel. r当前 The current output voltage of the reference channel V m当前 , and calculate the current output voltage V of the test channel r当前 The current output voltage of the reference channel V m当前 The difference (V r当前 -V m当前 ), the controller is used to test the current output voltage V r当前 The current output voltage of the reference channel V m当前 The difference (V r当前 -V m当前 ) Calculate the target gas concentration c.

[0106] In order to improve the calculation accuracy, a correction parameter is set in the process of calculating the target gas concentration. The controller is used to adjust the current output voltage V of the test channel. r当前 The current output voltage of the reference channel V m当前 The difference (V r当前 -Vm当前 ) and correction parameters to calculate the target gas concentration c.

[0107] The correction parameters are determined as follows: The controller is used to obtain the test channel output voltage V determined in advance based on the experiment r and the reference channel output voltage V m The difference (V r -V m ) and the target gas concentration c, and the fitting coefficient is obtained according to the fitting relationship, which is the correction parameter.

[0108] The test channel output voltage V is determined in advance based on the experiment r and the reference channel output voltage V m The fitting relationship between the difference and the target gas concentration c is V r -V m = a1*c + b1, and get the fitting coefficients a1 and b1.

[0109] The controller is used to r -V m And fitting coefficients a1, b1 are used to calculate the target gas concentration.

[0110] The controller calculates the target gas concentration c=(V r当前 -V m当前 -b1) / a1.

[0111] exist Figure 7 In the example, the process of determining the fitting coefficient of the fitting relationship between the difference between the test channel output voltage and the reference channel output voltage and the target gas concentration is as follows: S1. Start.

[0112] S2. Fill in several target gases with different concentrations.

[0113] S3. For each concentration of target gas, obtain the test channel output voltage V r and the reference channel output voltage V m .

[0114] S4. Calculate the test channel output voltage V r and the reference channel output voltage V m The difference.

[0115] S5. Draw the test channel output voltage V r and the reference channel output voltage V m The curve of the difference between the values ​​and the corresponding target gas concentration.

[0116] S6. Obtain fitting coefficients a1 and b1 based on the curve relationship.

[0117] exist Figure 8 In the example, the method for calculating the target gas concentration when there is target gas but no interfering gas is as follows: S1. Start.

[0118] S2. The controller controls the light source to emit light.

[0119] S3. The controller receives the current output voltage of the test channel output by the test channel and the current output voltage of the reference channel output by the reference channel of the dual-channel detector.

[0120] S4. The controller obtains fitting coefficients a1 and b1.

[0121] S5, the controller calculates the target gas concentration c= (V r当前 -V m当前 -b1) / a1.

[0122] When there are target gas and interfering gas, the concentration of target gas is calculated as follows: When the controller determines that there is target gas and interference gas, the controller is used to calculate the current output voltage V of the test channel. r当前 The test channel voltage V is the same as the test channel output voltage when only the target gas is present. r目标 The difference |V r目标 -V r当前 |, calculate the current output voltage V of the reference channel m当前 The reference channel voltage V is the same as the reference channel output voltage when only the target gas is present. m目标 The difference |V m目标 -V m当前 |, the controller is used to test the channel voltage difference |V r目标 -V r当前 | and the reference channel voltage difference |V m目标 -V m当前 The target gas concentration c is calculated from the difference between |

[0123] In some embodiments, the controller records the output voltages of the two channels, and the output voltage of the test channel when only the target gas is present is the test channel voltage V r目标 and the reference channel voltage V when only the target gas is present. m目标 It can be obtained from the recorded data, and generally the value before the interfering gas is used.

[0124] In some embodiments, the test channel output voltage V r目标 and the reference channel voltage V when only the target gas is present. m目标It can also be a preset value. When the output voltages of the two channels recorded by the controller do not yet record the output voltages of the two channels with only the target gas present, the preset value can be used.

[0125] In order to improve the calculation accuracy, a correction parameter is set in the process of calculating the target gas concentration. The controller is used to adjust the voltage difference of the test channel |V r目标 -V r当前 |Difference from reference channel voltage|V m目标 -V m当前 The target gas concentration c is calculated using the difference between | and the correction factor.

[0126] The correction parameters are determined as follows: The controller is used to obtain the test channel voltage difference |V r1 -V r2 |Difference from reference channel voltage|V m1 -V m2 The fitting relationship between the difference of | and the target gas concentration c is obtained, and the fitting coefficient is obtained according to the fitting relationship. The fitting coefficient is the correction parameter.

[0127] The test channel voltage difference |V r1 -V r2 | and the reference channel voltage difference |V m1 -V m2 The fitting relationship between the difference of | and the target gas concentration c is: |V r1 -V r2 |-|V m1 -V m2 |=a2*c+b2, get the fitting coefficients a2 and b2. Among them, V r1 、V r2 V is the voltage value obtained by the reference channel before and after the presence of interfering gas. m1 、V m2 These are the voltage values ​​obtained from the test channel before and after the presence of interfering gas.

[0128] The controller is used to test the voltage difference of the channel |V r1 -V r2 | and the reference channel voltage difference |V m1 -V m2 The difference between |V r1 -V r2 |-|V m1 -V m2 | and fitting coefficients a2 and b2 to calculate the target gas concentration c.

[0129] The controller calculates the target gas concentration c=(|V r目标 -V r当前 |-|V m目标-V m当前 |-b2) / a2.

[0130] exist Figure 9 In the example, determine the test channel voltage difference |V r1 -V r2 |Difference from reference channel voltage|V m1 -V m2 The process of fitting the coefficient of the fitting relationship between the difference of | and the target gas concentration c is: S1. Start.

[0131] S2. Fill in several target gases with different concentrations and interference gases with different concentrations respectively.

[0132] S3. For each concentration of target gas, obtain the output voltage V of the test channel before and after the interference gas is filled. r1 and V r2 and the reference channel output voltage V m1 and V m2 .

[0133] S4. Calculate the voltage difference of the test channel |V r1 -V r2 |Difference from reference channel voltage|V m1 -V m2 |The difference.

[0134] S5. Draw the test channel voltage difference |V r1 -V r2 |Difference from reference channel voltage|V m1 -V m2 The curve of the difference between | and the corresponding target gas concentration c.

[0135] S6. Obtain fitting coefficients a2 and b2 based on the curve relationship.

[0136] exist Figure 10 In the example, the method for calculating the target gas concentration when there is a target gas and an interfering gas is: S1. Start.

[0137] S2. The controller controls the light source to emit light.

[0138] S3. The controller records the output voltages of the two channels to determine whether there is interfering gas. If there is interfering gas, the controller obtains the output voltage values ​​of the test channel and the reference channel when only the target gas exists.

[0139] S4. The controller calculates the current output voltage V of the test channel r当前 The test channel voltage V is the same as the test channel output voltage when only the target gas is present. r目标 The difference |V r目标-V r当前 |, calculate the current output voltage V of the reference channel m当前 The reference channel voltage V is the same as the reference channel output voltage when only the target gas is present. m目标 The difference |V m目标 -V m当前 |, the controller is used to test the channel voltage difference |V r目标 -V r当前 | and the reference channel voltage difference |V m目标 -V m当前 |The difference.

[0140] S5. The controller obtains fitting coefficients a2 and b2.

[0141] S6, the controller calculates the target gas concentration c=(|V r目标 -V r当前 |-|V m目标 -V m当前 |-b2) / a2.

[0142] exist Figure 11 In the example, the process of the air conditioner detecting refrigerant leakage and outputting the target gas concentration is as follows: S1. Start.

[0143] S2. The controller controls the light source to emit light.

[0144] S3. The controller receives the current output voltage of the test channel output by the test channel and the current output voltage of the reference channel output by the reference channel of the dual-channel detector.

[0145] S4. Determine whether target gas and interfering gas exist. If only target gas exists, proceed to step S5. If target gas and interfering gas exist, proceed to step S6.

[0146] S5. Calculate the concentration of the target gas according to the method for calculating the concentration of the target gas when the target gas exists but no interfering gas exists. Then proceed to step S7.

[0147] S6. Calculate the concentration of the target gas according to the method for calculating the concentration of the target gas when the target gas and the interfering gas exist. Then proceed to step S7.

[0148] S7. Output the concentration of the target gas or perform alarm processing based on the concentration of the target gas.

[0149] The air conditioning system can determine the presence of target gas through a narrowband filter and the presence of interfering gas through a notch filter. When there is only interfering gas but no target gas, the alarm will not be triggered, thus avoiding false alarms. When both target and interfering gas are present, the concentration of the target gas can be accurately calculated, eliminating interference from the interfering gas and improving detection and alarm accuracy.

[0150] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0151] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioning device, comprising a refrigerant detection system, characterized in that: The refrigerant detection system includes: light source; A dual-channel detector comprising a test channel and a reference channel, wherein the test channel comprises a narrowband filter, the reference channel comprises a notch filter, and the central wavelengths of the narrowband filter and the notch filter are both the same as the central wavelength of the target gas; The controller is used to obtain the current output voltage of the test channel and the current output voltage of the reference channel, determine whether the target gas exists according to the current output voltage of the test channel, and determine whether the interfering gas exists according to the current output voltage of the reference channel.

2. The air conditioning device according to claim 1, characterized in that The controller is used to determine the presence of target gas when the current output voltage of the test channel does not exceed the set test voltage; determine the presence of interfering gas when the current output voltage of the reference channel does not exceed the set reference voltage; and determine the absence of interfering gas when the current output voltage of the reference channel exceeds the set reference voltage. The set test voltage and the set reference voltage are predetermined values.

3. The air conditioning device according to claim 2, characterized in that When the controller determines that the target gas exists and the interfering gas does not exist, the controller is used to calculate the difference between the current output voltage of the test channel and the current output voltage of the reference channel, and the controller is used to calculate the target gas concentration based on the difference.

4. The air conditioning device according to claim 3, characterized in that The controller is used to obtain a fitting relationship between the difference between the test channel output voltage and the reference channel output voltage and the target gas concentration, which is determined in advance based on experiments, and obtain a fitting coefficient. The controller is used to calculate the target gas concentration based on the difference and the fitting coefficient.

5. The air conditioning device according to claim 4, characterized in that The test channel output voltage V is determined in advance based on the experiment r and the reference channel output voltage V m The fitting relationship between the difference and the target gas concentration c is V r -V m = a1*c + b1, get the fitting coefficients a1 and b1, the controller calculates the target gas concentration c=(V r当前 -V m当前 -b1) / a1.

6. The air conditioning device according to claim 2, characterized in that When the controller determines that there is a target gas and an interfering gas, the controller is used to calculate the test channel voltage difference between the current output voltage of the test channel and the test channel output voltage when only the target gas is present, and calculate the reference channel voltage difference between the current output voltage of the reference channel and the reference channel output voltage when only the target gas is present. The controller is used to calculate the target gas concentration based on the difference between the test channel voltage difference and the reference channel voltage difference.

7. The air conditioning device according to claim 6, characterized in that The controller is used to obtain a fitting relationship between the difference between the test channel voltage difference and the reference channel voltage difference and the target gas concentration, which is determined in advance based on experiments, and obtain a fitting coefficient. The controller is used to calculate the target gas concentration based on the difference between the test channel voltage difference and the reference channel voltage difference and the fitting coefficient.

8. The air conditioning device according to claim 7, characterized in that The fitting relationship between the difference between the test channel voltage difference and the reference channel voltage difference determined in advance by the experiment and the target gas concentration c is: |V r1 -V r2 |-|V m1 -V m2 |=a2*c+b2, get the fitting coefficients a2 and b2, the controller calculates the target gas concentration c=(|V r目标 -V r当前 |-|V m目标 -V m当前 |-b2) / a2.

9. The air conditioning device according to claim 1, wherein The output voltage of the test channel is the average value obtained by summing the multiple electrical signals collected by the test channel by the controller; the output voltage of the reference channel is the average value obtained by summing the multiple electrical signals collected by the reference channel by the controller.

10. The air conditioning device according to any one of claims 1 to 9, characterized in that: The air conditioning device includes an alarm device, and the controller is used to control the alarm device to alarm when it is determined that the target gas exists; or, the controller is used to calculate the concentration of the target gas and control the alarm device to alarm when the target gas concentration exceeds a set concentration.

Images