A refrigerant leakage detection method, device and equipment

Abstract

The application provides a refrigerant leakage detection method, device and equipment. The first operation parameter in the operation process of the refrigeration equipment is collected and compared with the corresponding parameter threshold value, and the refrigerant leakage is determined according to the comparison result. The second operation parameter used for calculating the actual refrigeration capacity is collected, and the actual refrigeration capacity under the current operation state of the refrigeration equipment is calculated. According to the mapping relationship between different second operation parameters and the target refrigeration capacity when the refrigeration equipment is normally operated, the target refrigeration capacity corresponding to the current second operation parameter is determined. According to the difference between the actual refrigeration capacity and the determined target refrigeration capacity, the leakage degree of the refrigerant of the refrigeration equipment is determined, and the protection measure corresponding to the determined leakage degree is taken. Through the method provided by the application, whether the refrigerant leakage degree is determined can be identified in time and effectively, the user can take corresponding measures in time, and the device damage caused by serious refrigerant leakage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment refrigeration, in particular to a refrigerant leakage detection method, device and equipment. BACKGROUND

[0002] With the rapid development of information technology, the power density of IT equipment is rapidly rising, and the application of high heat density cabinets in data centers has become the norm. The reliability of refrigeration equipment in data centers is extremely high. Once a failure occurs, the refrigeration capacity is insufficient or the refrigeration equipment stops running, which will cause the temperature in the computer room to rise rapidly, resulting in the server overheating and stopping working.

[0003] For refrigeration equipment, the reason for insufficient refrigeration capacity or equipment damage may be caused by refrigerant leakage. The reasons for refrigerant leakage may include the following:

[0004] 1. The refrigeration equipment itself has a slight leakage before installation;

[0005] 2. During the installation of the refrigeration equipment, the indoor and outdoor units are not firmly connected, resulting in leakage of the refrigeration equipment;

[0006] 3. In the process of long-term operation and vibration of the refrigeration equipment, the weak parts of the copper pipe or other connections at the connection may leak.

[0007] In the refrigeration equipment, the leakage of refrigerant will cause the refrigerant suctioned by the compressor to decrease, resulting in insufficient system refrigeration capacity, and in severe cases, the heat generated by the motor of the compressor cannot be effectively discharged, causing damage to the compressor. In the prior art, when determining the refrigerant of the refrigeration equipment, the degree of refrigerant leakage cannot be determined, and corresponding protection measures are not developed for different degrees of refrigerant leakage. It may not be discovered until the refrigeration effect is extremely poor or the device is damaged, at which time the user has already been greatly affected. Moreover, for flammable refrigerants, when the leakage is too much, a fire may occur, which poses a safety hazard. SUMMARY

[0008] The present application provides a refrigerant leakage detection method, device and equipment to solve the problem that the degree of refrigerant leakage cannot be determined in the prior art.

[0009] In a first aspect, the present application provides a refrigerant leakage detection method, which comprises:

[0010] Collecting first operating parameters of the refrigeration equipment during operation and comparing them with corresponding parameter thresholds to determine whether refrigerant leakage has occurred according to the comparison results;

[0011] Collecting second operating parameters for calculating the actual refrigeration capacity and calculating the actual refrigeration capacity under the current operating state of the refrigeration equipment;

[0012] According to a pre-established mapping relationship between different second operating parameters and target refrigerating capacity of the refrigeration equipment in normal operation, a target refrigerating capacity corresponding to the current second operating parameter is determined;

[0013] According to a difference degree between the actual refrigerating capacity and the determined target refrigerating capacity, a refrigerant leakage degree of the refrigeration equipment is determined, and a protection measure corresponding to the determined leakage degree is taken.

[0014] In a possible implementation, the first operating parameters are multiple, the first operating parameters in the operation process of the refrigeration equipment are collected and compared with corresponding parameter thresholds, and it is determined that refrigerant leakage occurs according to a comparison result, including:

[0015] The multiple first operating parameters are sequentially compared with corresponding preset parameter thresholds, and it is determined that refrigerant leakage occurs when all comparison results meet the condition of refrigerant leakage, or it is determined that refrigerant leakage does not occur.

[0016] In a possible implementation, the multiple first operating parameters are sequentially compared with corresponding preset parameter thresholds, and it is determined that refrigerant leakage occurs when all comparison results meet the condition of refrigerant leakage, or it is determined that refrigerant leakage does not occur, including:

[0017] The actual operating frequency F1 of the compressor is compared with a preset maximum compressor frequency Fmax under the current refrigeration demand;

[0018] When F1 is greater than Fmax, the actual discharge temperature Tp of the compressor is compared with a preset maximum discharge temperature Tpmax of the compressor under the actual operating frequency, or it is determined that refrigerant leakage does not occur;

[0019] When Tp is greater than Tpmax, the actual opening degree K of the electronic expansion valve is compared with a preset maximum opening degree Kmax, or it is determined that refrigerant leakage does not occur;

[0020] When K is greater than Kmax, the actual low-pressure pressure P is compared with a preset minimum low-pressure pressure Pmin, or the actual high-pressure pressure P1 is compared with a preset minimum high-pressure pressure P1min, or it is determined that refrigerant leakage does not occur;

[0021] When P is less than Pmin or P1 is less than P1min, it is determined that refrigerant leakage occurs, or it is determined that refrigerant leakage does not occur.

[0022] In a possible implementation, the first operating parameters in the operation process of the refrigeration equipment are collected, including:

[0023] In the process of adjusting the refrigeration output according to the current refrigeration demand, when it is determined that the relationship between the refrigeration output and the refrigeration demand satisfies the condition of the balance state, a first operating parameter in the operation process of the refrigeration equipment is collected.

[0024] In a possible implementation, the determination that the relationship between the refrigeration output and the refrigeration demand satisfies the condition of the balance state comprises:

[0025] When it is determined that a variation range of a third operating parameter of the refrigeration equipment in a preset time period is Δx, the relationship between the refrigeration output and the refrigeration demand satisfies the condition of the balance state, wherein the third operating parameter comprises an indoor supply air temperature or an indoor return air temperature or a wind pressure, and Δx is a preset value.

[0026] In a possible implementation, a second operating parameter used for calculating an actual refrigeration amount is collected, and the actual refrigeration amount in the current operation state of the refrigeration equipment is calculated, comprising:

[0027] The actual indoor supply air temperature and humidity, the actual indoor return air temperature and humidity, and the actual air volume are collected.

[0028] An actual indoor supply air enthalpy value h is calculated according to the collected actual indoor supply air temperature and humidity. N An actual indoor return air enthalpy value h0 is calculated according to the collected actual indoor return air temperature and humidity.

[0029] An actual refrigeration amount calculation formula is: The actual refrigeration amount in the current operation state of the refrigeration equipment is calculated.

[0030] In the formula, Q represents the actual refrigeration amount, G represents the actual air volume, and a is a preset value.

[0031] In a possible implementation, a mapping relationship between different second operating parameters and a target refrigeration amount in the normal operation of the refrigeration equipment is established in advance, comprising:

[0032] A mapping relationship between the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature, the outdoor temperature in the normal operation of the refrigeration equipment under different refrigeration demands, and the target refrigeration amount in the normal operation of the refrigeration equipment is established.

[0033] In a possible implementation, according to the difference between the actual refrigeration amount and the determined target refrigeration amount, the leakage degree of the refrigerant of the refrigeration equipment is determined, and a protection measure corresponding to the determined leakage degree is taken, comprising:

[0034] The ratio of the actual refrigeration amount in the current operation state of the refrigeration equipment to the determined target refrigeration amount is calculated.

[0035] determining that the refrigeration equipment has a low degree of refrigerant leakage or a medium degree of refrigerant leakage or a high degree of refrigerant leakage according to the preset percentage range in which the ratio is located;

[0036] if the refrigeration equipment has a low degree of refrigerant leakage, issuing a reminder of detecting refrigerant leakage;

[0037] if the refrigeration equipment has a medium degree of refrigerant leakage, issuing an alarm of refrigerant leakage;

[0038] if the refrigeration equipment has a high degree of refrigerant leakage, issuing an alarm of stopping operation of the refrigeration equipment;

[0039] wherein the higher the ratio is, the lower the degree of refrigerant leakage of the refrigeration equipment is.

[0040] In a second aspect, the present application provides a refrigerant leakage detection device, which comprises:

[0041] a refrigerant leakage occurrence determination module for collecting first operating parameters in the operation process of the refrigeration equipment and comparing the first operating parameters with corresponding parameter thresholds, and determining refrigerant leakage occurrence according to a comparison result;

[0042] an actual refrigeration capacity calculation module for collecting second operating parameters for calculating actual refrigeration capacity, and calculating actual refrigeration capacity in a current operating state of the refrigeration equipment;

[0043] a target refrigeration capacity determination module for determining a target refrigeration capacity corresponding to the current second operating parameters according to a mapping relationship between different second operating parameters and the target refrigeration capacity in normal operation of the refrigeration equipment;

[0044] a refrigerant leakage degree determination module for determining a degree of refrigerant leakage of the refrigeration equipment according to a difference between the actual refrigeration capacity and the determined target refrigeration capacity, and taking a protection measure corresponding to the determined degree of refrigerant leakage.

[0045] In a third aspect, the present application provides a refrigerant leakage detection device, which comprises:

[0046] at least one processor; and a memory communicatively connected with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the refrigerant leakage detection methods.

[0047] In a fourth aspect, the present application provides a refrigeration equipment, which comprises:

[0048] a compressor, a condenser, an evaporator, a throttling device, and temperature sensors and pressure sensors for collecting first operating parameters and second operating parameters in the operation process of the refrigeration equipment;

[0049] The refrigerant leakage detection device according to the third aspect.

[0050] In a fifth aspect, the present application provides a computer storage medium storing a computer program for causing a computer to execute any of the refrigerant leakage detection methods.

[0051] The present application provides a refrigerant leakage detection method, device and equipment, by comparing the difference degree of actual refrigeration capacity and target refrigeration capacity, determining the refrigerant leakage of different degrees of refrigeration equipment, and making different levels of alarm prompt scheme, facilitating the user to take timely response measures, avoiding the device damage caused by serious refrigerant leakage, and reducing the device failure rate of air conditioning equipment. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A refrigeration equipment structure schematic diagram according to an example of an example embodiment of the present application;

[0053] Figure 2 A refrigerant leakage detection method flowchart according to an example of an example embodiment of the present application;

[0054] Figure 3 A refrigerant leakage determination flowchart according to an example of an example embodiment of the present application;

[0055] Figure 4 Another refrigerant leakage determination flowchart according to an example of an example embodiment of the present application;

[0056] Figure 5 A refrigerant leakage degree determination flowchart according to an example of an example embodiment of the present application;

[0057] Figure 6 A refrigerant leakage device schematic diagram according to an example of an example embodiment of the present application;

[0058] Figure 7 A refrigerant leakage device schematic diagram according to an example of an example embodiment of the present application. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0060] As Figure 1The diagram shows a refrigeration equipment structure, which mainly includes: a compressor, a condenser, an evaporator, a pressure sensor (P), a temperature sensor (NTC), a high-pressure switch (HP), an electronic expansion valve (EEV), a dryer filter, a sight glass, a high-pressure switch, and a control unit.

[0061] In one possible implementation, a compressor is used to draw refrigerant from a low-pressure zone, compress the refrigerant, and then send it to a high-pressure zone.

[0062] A condenser is used in the high-pressure zone of refrigeration equipment to cool and liquefy the refrigerant.

[0063] An evaporator is used in the low-pressure zone of refrigeration equipment to vaporize the refrigerant by absorbing heat.

[0064] Temperature sensors are used to detect indoor return air temperature, indoor supply air temperature, and outdoor temperature;

[0065] Pressure sensors are used to detect the high and low pressure of the refrigerant.

[0066] The control unit includes at least one processor and a memory communicatively connected to the at least one processor. The processor is used to receive indoor return air temperature, indoor supply air temperature and outdoor temperature sent by a pressure and temperature sensor, and high pressure and low pressure of refrigerant sent by a pressure sensor, and to determine the operating status of the refrigeration equipment. The memory is used to store indoor return air temperature, indoor supply air temperature and outdoor temperature sent by a temperature sensor, and high pressure and low pressure of refrigerant sent by a pressure sensor, and to send commands to the compressor and fan to control the frequency of the compressor and fan.

[0067] The high-pressure switch is located in the high-pressure zone and is used to provide high-pressure protection for the refrigeration equipment in case of abnormal operation. The dryer filter is used to dry the refrigerant in the pipes, and the sight glass is used to observe the liquid refrigerant level. The electronic expansion valve is a throttling device used to reduce the pressure of the high-pressure liquid refrigerant, maintaining the pressure difference between the condenser and evaporator, allowing the liquid refrigerant in the evaporator to evaporate at the required low pressure, achieving the purpose of refrigeration; it is also used to regulate the refrigerant flow rate supplied to the evaporator to adapt to changes in the evaporator's heat load. This application provides a refrigeration device, and those skilled in the art can modify the structure of the refrigeration device according to actual needs.

[0068] by Figure 1 Taking the refrigeration equipment shown as an example, this application embodiment provides a refrigerant leakage detection method, such as... Figure 2 As shown, the method includes:

[0069] S201: Collect the first operating parameters of the refrigeration equipment during operation and compare them with the corresponding parameter thresholds. Determine whether a refrigerant leak has occurred based on the comparison results.

[0070] When the refrigeration device starts to start, the value of the first operating parameter may have a large fluctuation, at this time, the first operating parameter is not collected, and in the process of adjusting the refrigeration output according to the current refrigeration demand, when it is determined that the relationship between the refrigeration output and the refrigeration demand meets the condition of the balance state, the first operating parameter of the refrigeration device in the running process is collected.

[0071] In a possible implementation, the condition that the relationship between the refrigeration output and the refrigeration demand meets the balance state includes:

[0072] When it is determined that the variation range of the third operating parameter of the refrigeration device in a preset time period is Δx, the relationship between the refrigeration output and the refrigeration demand meets the condition of the balance state, wherein the third operating parameter includes but is not limited to indoor supply air temperature or indoor return air temperature or air pressure, Δx is a preset value, and the preset time period is a period from starting of the refrigeration device to stable running of the refrigeration device.

[0073] The first operating parameter may include one or more, and each first operating parameter influences each other, for example, the greater the running frequency of the refrigeration device, the greater the exhaust temperature of the refrigeration device, if multiple first operating parameters are collected, the multiple operating parameters need to be sorted first, and then the corresponding parameter threshold is compared in sequence.

[0074] S202: Collecting a second operating parameter used for calculating an actual refrigeration capacity, and calculating the actual refrigeration capacity in the current running state of the refrigeration device.

[0075] In the process of collecting the operating parameter, the first operating parameter and the second operating parameter are collected at the same time, wherein the second operating parameter includes multiple parameters, which can include the same parameters as the first operating parameter or different operating parameters from the first operating parameter.

[0076] After it is determined that the refrigeration device has refrigerant leakage, a refrigerant leakage degree determination procedure is entered, wherein the actual refrigeration capacity in the current running state of the refrigeration device is calculated by using an actual refrigeration capacity formula provided in the embodiments of the present application, and specifically, the formula can be realized by the refrigerant leakage degree determination procedure.

[0077] S203: According to a mapping relationship between different second operating parameters and a target refrigeration capacity in a normal running state of the refrigeration device, the target refrigeration capacity corresponding to the current second operating parameter is determined.

[0078] For different refrigeration requirements, the second operating parameters and the target refrigeration capacity are also different. The second operating parameters include: the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature and the outdoor temperature. The target refrigeration capacity refers to the refrigeration capacity that the refrigeration equipment should reach under the combination of the above-mentioned second operating parameters under normal operation. For example, when the operating frequency of the compressor is 80HZ, the operating frequency of the fan is 50HZ, the indoor return air temperature is 37 degrees Celsius, and the outdoor temperature is 35 degrees Celsius, the target refrigeration capacity of the refrigeration equipment under this operating state should be 50 kilowatts, and when the refrigerant leaks, the refrigeration equipment will not be able to reach the refrigeration capacity of 50 kilowatts. By collecting the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature and the outdoor temperature of the refrigeration equipment under different refrigeration requirements under normal operation and experimental testing, a mapping relationship between the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature and the outdoor temperature and the target refrigeration capacity of the refrigeration equipment under normal operation is established. Among them, the greater the compressor frequency, the greater the fan frequency, the higher the indoor return air temperature, and the lower the outdoor temperature, the greater the corresponding target refrigeration capacity.

[0079] S204: According to the difference between the actual refrigeration capacity and the determined target refrigeration capacity, the leakage degree of the refrigeration equipment refrigerant is determined, and the protection measures corresponding to the determined leakage degree are taken.

[0080] The difference between the actual refrigeration capacity and the determined target refrigeration capacity can be the ratio of the actual refrigeration capacity to the determined target refrigeration capacity, or the ratio of the difference between the determined target refrigeration capacity and the actual refrigeration capacity to the target refrigeration capacity, as long as it can represent the difference between the two, which is not limited here.

[0081] According to the difference, the degree of refrigerant leakage is divided into low, medium and high degree of refrigerant leakage, wherein the greater the difference, the higher the degree of refrigerant leakage.

[0082] The present application provides a refrigerant leakage detection method, which determines the refrigerant leakage according to the first operating parameters, determines the actual refrigeration capacity and the target refrigeration capacity according to the second operating parameters, determines the leakage degree of the refrigerant according to the difference between the actual refrigeration capacity and the target refrigeration capacity, and takes the protection measures corresponding to the determined leakage degree. According to the method provided in the embodiments of the present application, whether the refrigerant leaks can be identified in time and effectively, and different levels of alarm prompt schemes are made according to different refrigeration capacity percentages, so that the user can take timely response measures, avoid device damage caused by serious refrigerant leakage, and reduce the failure rate of air conditioning equipment devices.

[0083] The first operating parameter of the refrigeration equipment during operation is collected and compared with the corresponding parameter threshold value, and the occurrence of refrigerant leakage is determined according to the comparison result. In one possible implementation, the first operating parameter is multiple, the first operating parameter of the refrigeration equipment during operation is collected and compared with the corresponding parameter threshold value, and the occurrence of refrigerant leakage is determined according to the comparison result, comprising:

[0084] The plurality of first operating parameters are compared with the corresponding preset parameter threshold value in sequence, and when all comparison results meet the condition of refrigerant leakage, it is determined that refrigerant leakage occurs, otherwise it is determined that refrigerant leakage does not occur.

[0085] The plurality of first operating parameters of the refrigeration equipment are related to each other, that is, when a certain first operating parameter changes, other first operating parameters will also change correspondingly, so it is necessary to sort each first operating parameter and then determine in sequence, as shown in Figure 3

[0086] S301: After the air conditioning equipment completes the start, the refrigeration demand and the refrigeration output are recorded, and when the refrigeration demand and the refrigeration output are stable, the refrigerant leakage detection is performed;

[0087] S302: The actual operating frequency F1 of the compressor is compared with the preset maximum compressor frequency Fmax under the current refrigeration demand;

[0088] S303: When F1 is greater than Fmax, S304 is executed, otherwise S311 is executed;

[0089] S304: The actual discharge temperature Tp of the equipment is compared with the preset maximum discharge temperature Tpmax under the actual operating frequency of the compressor;

[0090] S305: When Tp is greater than Tpmax, S306 is executed, otherwise S311 is executed;

[0091] S306: The actual opening degree K of the electronic expansion valve is compared with the preset maximum opening degree Kmax;

[0092] S307: When K is greater than Kmax, S308 is executed, otherwise S311 is executed;

[0093] S308: The actual low pressure P is compared with the preset minimum low pressure Pmin;

[0094] S309: When P is less than Pmin, it is determined that refrigerant leakage occurs, S310 is executed, otherwise S311 is executed.

[0095] S310: Enter the refrigerant leakage degree determination program;

[0096] ​S311: maintaining the current running state.

[0097] In the implementation process, the above-mentioned multiple first running parameters can be added, deleted or replaced, such as Figure 4 as shown:

[0098] The low-pressure pressure is replaced by the high-pressure pressure, and the actual high-pressure pressure P1 is compared with the preset minimum high-pressure pressure P1min. When P1 is less than P1min, it is determined that the refrigerant leaks, otherwise it is determined that the refrigerant does not leak. The embodiments of the application can effectively reduce the false alarm rate, improve the accuracy of detecting refrigerant leakage, and thus improve the reliability of the product by detecting multiple first running parameters and performing calculation and analysis, thereby reducing the problem of misjudgment.

[0099] The above-mentioned S202 collects the second running parameters for calculating the actual refrigeration capacity, and calculates the actual refrigeration capacity under the current running state of the refrigeration equipment, which can be specifically implemented as follows:

[0100] In one possible implementation, the actual indoor supply air temperature and humidity, the actual indoor return air temperature and humidity, and the actual air volume are collected.

[0101] According to the collected actual indoor supply air temperature and humidity, the corresponding actual indoor supply air enthalpy h1 is calculated N According to the collected actual indoor return air temperature and humidity, the corresponding actual indoor return air enthalpy h0 is calculated.

[0102] According to the actual refrigeration capacity calculation formula the actual refrigeration capacity under the current running state of the refrigeration equipment is calculated, wherein Q is the actual refrigeration capacity, G is the actual air volume, and a is a preset value, specifically a can be 1000.

[0103] The above-mentioned S204 determines the leakage degree of the refrigerant of the refrigeration equipment, and takes the protection measures corresponding to the determined leakage degree, which can be specifically implemented as follows, such as Figure 5 as shown:

[0104] S501: after determining that there is refrigerant leakage, the refrigerant leakage degree determination program is performed;

[0105] S502: calculating the actual refrigeration capacity according to the indoor supply / return air enthalpy and air volume of the refrigeration equipment;

[0106] S503: according to the running frequency of the compressor, the running frequency of the fan, the indoor return air temperature and the outdoor temperature corresponding to the target refrigeration capacity of the refrigeration equipment under normal operation;

[0107] S504: calculating the ratio of the actual refrigeration capacity under the current running state of the refrigeration equipment to the determined target refrigeration capacity;

[0108] S505: determining whether the ratio is greater than a target percentage a, if yes, performing S506, otherwise performing S507;

[0109] S506: determining that the refrigerant has a low degree of leakage, and issuing a reminder of detecting the refrigerant leakage;

[0110] S507: determining whether the ratio is less than a target percentage b, if yes, performing S509, otherwise performing S508;

[0111] S508: determining that the refrigerant has a medium degree of leakage, and issuing an alarm of the refrigerant leakage;

[0112] S509: issuing an alarm of stopping the operation of the refrigeration device.

[0113] According to the above embodiments, the refrigerant leakage can be effectively identified at an early stage, different levels of alarm prompt schemes are made according to different percentages of refrigeration capacity, the user can make a response scheme at the first time, and safety problems can be avoided. When the refrigerant has a low degree of leakage, the control unit issues a refrigerant leakage detection reminder, the user can detect the position of the refrigerant leakage according to the actual demand, and then repair it, or can not make any treatment and maintain the current operation state.

[0114] Based on the same inventive concept, the embodiments of the present application also provide a refrigerant leakage detection device 600, as shown in Figure 6 The device comprises:

[0115] A refrigerant leakage determination module 601 is configured to collect first operation parameters of the refrigeration device during operation and compare the first operation parameters with corresponding parameter thresholds, and determine the occurrence of refrigerant leakage according to a comparison result.

[0116] An actual refrigeration capacity calculation module 602 is configured to collect second operation parameters for calculating the actual refrigeration capacity, and calculate the actual refrigeration capacity under the current operation state of the refrigeration device.

[0117] A target refrigeration capacity determination module 603 is configured to determine a target refrigeration capacity corresponding to the current second operation parameters according to a mapping relationship between different second operation parameters and the target refrigeration capacity when the refrigeration device is normally operated.

[0118] A refrigerant leakage degree determination module 604 is configured to determine the leakage degree of the refrigerant of the refrigeration device according to a difference between the actual refrigeration capacity and the determined target refrigeration capacity, and take a protection measure corresponding to the determined leakage degree.

[0119] In a possible implementation, the determining refrigerant leakage occurrence module is configured to collect first operation parameters of the refrigeration device during operation and compare the first operation parameters with corresponding parameter thresholds, and determine refrigerant leakage occurrence according to comparison results, including:

[0120] comparing the plurality of first operation parameters with corresponding preset parameter thresholds in sequence, and determining refrigerant leakage occurrence when all comparison results meet conditions of refrigerant leakage, or determining no refrigerant leakage occurrence.

[0121] In a possible implementation, the determining refrigerant leakage occurrence module compares the plurality of first operation parameters with corresponding preset parameter thresholds in sequence, and determines refrigerant leakage occurrence when all comparison results meet conditions of refrigerant leakage, or determines no refrigerant leakage occurrence, including:

[0122] comparing an actual operation frequency F1 of the compressor with a preset maximum compressor frequency Fmax under current refrigeration demand;

[0123] when F1 is greater than Fmax, comparing an actual discharge temperature Tp of the compressor with a preset maximum discharge temperature Tpmax of the compressor under the actual operation frequency of the compressor, or determining no refrigerant leakage occurrence;

[0124] when Tp is greater than Tpmax, comparing an actual opening degree K of the electronic expansion valve with a preset maximum opening degree Kmax, or determining no refrigerant leakage occurrence;

[0125] when K is greater than Kmax, comparing an actual low-pressure pressure P with a preset minimum low-pressure pressure Pmin, or comparing an actual high-pressure pressure P1 with a preset minimum high-pressure pressure P1min, or determining no refrigerant leakage occurrence;

[0126] when P is less than Pmin or P1 is less than P1min, determining refrigerant leakage, or determining no refrigerant leakage occurrence.

[0127] In a possible implementation, the determining refrigerant leakage occurrence module collects first operation parameters of the refrigeration device during operation, including:

[0128] during adjustment of refrigeration capacity output of the refrigeration device according to current refrigeration demand, collecting first operation parameters of the refrigeration device during operation when a relationship between the refrigeration capacity output and the refrigeration demand meets conditions of a balanced state.

[0129] In a possible implementation, the determining refrigerant leakage occurrence module determines that the relationship between the refrigeration capacity output and the refrigeration demand meets conditions of a balanced state, including:

[0130] When a third operating parameter of the refrigeration device is determined to have a variation range of Δx within a preset time period, the relationship between the refrigeration output and the refrigeration demand satisfies the condition of the balanced state, wherein the third operating parameter comprises an indoor supply air temperature or an indoor return air temperature or a wind pressure, and Δx is a preset value.

[0131] In a possible implementation, the actual refrigeration amount calculation module is configured to collect second operating parameters for calculating the actual refrigeration amount, and calculate the actual refrigeration amount under the current operating state of the refrigeration device, comprising:

[0132] collecting actual indoor supply air temperature and humidity, actual indoor return air temperature and humidity, and actual air volume;

[0133] calculating corresponding actual indoor supply air enthalpy h N according to the collected actual indoor return air temperature and humidity;

[0134] calculating the actual refrigeration amount under the current operating state of the refrigeration device according to an actual refrigeration amount calculation formula , wherein Q is the actual refrigeration amount, G is the actual air volume, and a is a preset value.

[0135] In a possible implementation, the target refrigeration amount determination module establishes a mapping relationship between different second operating parameters and the target refrigeration amount when the refrigeration device is normally operated, comprising:

[0136] establishing a mapping relationship between the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature, the outdoor temperature, and the target refrigeration amount when the refrigeration device is normally operated under different refrigeration demands.

[0137] In a possible implementation, the refrigerant leakage degree determination module determines the refrigerant leakage degree of the refrigeration device according to the difference between the actual refrigeration amount and the determined target refrigeration amount, and takes a protection measure corresponding to the determined refrigerant leakage degree, comprising:

[0138] calculating a ratio of the actual refrigeration amount under the current operating state of the refrigeration device to the determined target refrigeration amount;

[0139] determining that the refrigeration device has low-degree refrigerant leakage or medium-degree refrigerant leakage or high-degree refrigerant leakage according to whether the ratio is within a preset percentage range;

[0140] if the refrigeration device has low-degree refrigerant leakage, issuing a reminder to detect refrigerant leakage;

[0141] if the refrigeration device has medium-degree refrigerant leakage, issuing an alarm for refrigerant leakage;

[0142] If the refrigeration equipment has a high degree of refrigerant leakage, an alarm is issued to stop the operation of the refrigeration equipment.

[0143] The higher the ratio is, the lower the degree of refrigerant leakage of the refrigeration equipment is.

[0144] Based on the same inventive concept, the embodiments of the present application also provide a refrigerant leakage detection device, which comprises:

[0145] At least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute any one of the refrigerant leakage detection methods.

[0146] As shown in Figure 4 The device comprises a processor 701, a memory 702, and a communication interface 703; a bus 704. Wherein the processor 701, the memory 702 and the communication interface 703 are connected to each other through the bus 704.

[0147] The processor 701 is configured to read the instructions in the memory 702 and execute them to enable the at least one processor to execute the refrigerant leakage detection method provided by the above-mentioned embodiments.

[0148] The memory 702 is configured to store various instructions and programs of the refrigerant leakage detection method provided by the above-mentioned embodiments.

[0149] The communication interface 703 is configured to realize data interaction between the pressure sensor, the temperature sensor and the electronic control unit.

[0150] The bus 704 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 7 Only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0151] The processor 701 can be a central processing unit (CPU), a network processor (NP), a Graphic Processing Unit (GPU), or any combination of CPU, NP, GPU. It can also be a hardware chip. The hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0152] In addition, the present application also provides a computer readable storage medium, the computer storage medium stores a computer program, the computer program is used for making a computer execute the method described in any one of the above embodiments.

[0153] These computer program instructions can also be stored in a computer readable memory that can direct the computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer readable memory produce a product including an instruction device, which realizes the functions specified in the flow Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0154] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer implemented process, so that the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in the flow Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0155] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0156] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for detecting refrigerant leaks, characterized in that, The method includes: Collect the first operating parameters of the refrigeration equipment during operation and compare them with the corresponding parameter thresholds. Determine whether a refrigerant leak has occurred based on the comparison results. Collect the second operating parameters used to calculate the actual cooling capacity, and calculate the actual cooling capacity of the refrigeration equipment under the current operating state; Based on the pre-established mapping relationship between different second operating parameters and the target cooling capacity when the refrigeration equipment is running normally, the target cooling capacity corresponding to the current second operating parameter is determined; Based on the degree of difference between the actual cooling capacity and the determined target cooling capacity, the degree of refrigerant leakage in the refrigeration equipment is determined, and protective measures corresponding to the determined degree of leakage are taken. The first operating parameters are multiple. The first operating parameters during the operation of the refrigeration equipment are collected and compared with corresponding parameter thresholds. Based on the comparison results, it is determined whether a refrigerant leak has occurred, including: Compare the actual operating frequency F1 of the compressor with the preset maximum compressor frequency Fmax under the current cooling demand; If F1 is greater than Fmax, the actual discharge temperature Tp of the compressor is compared with the preset maximum discharge temperature Tpmax at the actual operating frequency of the compressor; otherwise, it is determined that no refrigerant leakage has occurred. If Tp is greater than Tpmax, compare the actual opening degree K of the electronic expansion valve with the preset maximum opening degree Kmax; otherwise, it is determined that no refrigerant leakage has occurred. If K is greater than Kmax, compare the actual low pressure P with the preset minimum low pressure Pmin, or compare the actual high pressure P1 with the preset minimum high pressure P1min; otherwise, it is determined that no refrigerant leakage has occurred. If P is less than Pmin or P1 is less than P1min, then a refrigerant leak is confirmed; otherwise, no refrigerant leak is confirmed.

2. The method according to claim 1, characterized in that, The first operating parameters collected during the operation of the refrigeration equipment include: During the process of adjusting the cooling capacity output of the refrigeration equipment according to the current cooling demand, when it is determined that the relationship between the cooling capacity output and the cooling demand meets the condition of a balanced state, the first operating parameter of the refrigeration equipment operation process is collected.

3. The method according to claim 2, characterized in that, The conditions for determining that the relationship between the cooling capacity output and the cooling demand satisfies an equilibrium state include: When the variation range of the third operating parameter of the refrigeration equipment within a preset time period is determined to be Δx, the relationship between the refrigeration output and the refrigeration demand satisfies the condition of a balanced state. The third operating parameter includes indoor supply air temperature, indoor return air temperature, or air pressure, and Δx is a preset value.

4. The method according to claim 1, characterized in that, Collect second operating parameters used to calculate the actual cooling capacity, and calculate the actual cooling capacity of the refrigeration equipment under its current operating state, including: Collect actual indoor supply air temperature and humidity, actual indoor return air temperature and humidity, and actual air volume; The actual indoor air supply enthalpy value is calculated based on the collected actual indoor air supply temperature and humidity. h N The actual indoor return air enthalpy value is calculated based on the collected actual indoor return air temperature and humidity. h 0 ; According to the formula for calculating actual cooling capacity Calculate the actual cooling capacity of the refrigeration equipment under its current operating conditions; In the formula, Q is the actual cooling capacity, G is the actual air volume, and a is the preset value.

5. The method according to claim 1, characterized in that, The pre-established mapping relationship between different second operating parameters and the target cooling capacity of the refrigeration equipment during normal operation includes: Establish a mapping relationship between the operating frequency of the compressor, the operating frequency of the fan, the indoor return air temperature, and the outdoor temperature of the refrigeration equipment under different refrigeration requirements during normal operation and the target refrigeration capacity of the refrigeration equipment during normal operation.

6. The method according to claim 1, characterized in that, Based on the difference between the actual cooling capacity and the determined target cooling capacity, the degree of refrigerant leakage in the refrigeration equipment is determined, and protective measures corresponding to the determined leakage degree are taken, including: Calculate the ratio of the actual cooling capacity of the refrigeration equipment under its current operating state to the determined target cooling capacity; Based on the preset percentage range of the ratio, it is determined that the refrigeration equipment has a low degree of refrigerant leakage, a medium degree of refrigerant leakage, or a high degree of refrigerant leakage. If there is a minor refrigerant leak in the refrigeration equipment, an alert will be issued to detect the refrigerant leak. If there is a moderate refrigerant leak in the refrigeration equipment, a refrigerant leak alarm will be issued; If there is a high degree of refrigerant leakage in the refrigeration equipment, an alarm will be issued to stop the operation of the refrigeration equipment; The higher the ratio, the lower the degree of refrigerant leakage in the refrigeration equipment.

7. A refrigerant leak detection device, characterized in that, The device includes: The module for determining refrigerant leakage is used to collect the first operating parameters of the refrigeration equipment during operation and compare them with the corresponding parameter thresholds. Based on the comparison results, it is determined that a refrigerant leak has occurred. The module for calculating actual cooling capacity is used to collect the second operating parameters for calculating the actual cooling capacity and to calculate the actual cooling capacity of the refrigeration equipment under the current operating state. The target cooling capacity determination module is used to determine the target cooling capacity corresponding to the current second operating parameter based on the pre-established mapping relationship between different second operating parameters and the target cooling capacity when the refrigeration equipment is running normally. The module for determining the degree of refrigerant leakage is used to determine the degree of refrigerant leakage in the refrigeration equipment based on the difference between the actual cooling capacity and the determined target cooling capacity, and to take protective measures corresponding to the determined degree of leakage. The module for determining refrigerant leakage is used to collect first operating parameters during the operation of the refrigeration equipment and compare them with corresponding parameter thresholds. Based on the comparison results, it determines that a refrigerant leak has occurred, including: Compare the actual operating frequency F1 of the compressor with the preset maximum compressor frequency Fmax under the current cooling demand; If F1 is greater than Fmax, the actual discharge temperature Tp of the compressor is compared with the preset maximum discharge temperature Tpmax at the actual operating frequency of the compressor; otherwise, it is determined that no refrigerant leakage has occurred. If Tp is greater than Tpmax, compare the actual opening degree K of the electronic expansion valve with the preset maximum opening degree Kmax; otherwise, it is determined that no refrigerant leakage has occurred. If K is greater than Kmax, compare the actual low pressure P with the preset minimum low pressure Pmin, or compare the actual high pressure P1 with the preset minimum high pressure P1min; otherwise, it is determined that no refrigerant leakage has occurred. If P is less than Pmin or P1 is less than P1min, then a refrigerant leak is confirmed; otherwise, no refrigerant leak is confirmed.

8. A refrigerant leak detection device, characterized in that, The device includes: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method as described in any one of claims 1-6.

9. A refrigeration device, characterized in that, The refrigeration equipment includes: The compressor, condenser, evaporator, throttling device, and temperature and pressure sensors for collecting first and second operating parameters during the operation of the refrigeration equipment; The refrigerant leak detection device as described in claim 8.

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