Electronic expansion valve service life testing device

Abstract

The utility model relates to the technical field of air treatment, and discloses an electronic expansion valve service life testing device which comprises a refrigerant circulation system, the refrigerant circulation system comprises a testing loop main path, a plurality of testing loop branches arranged in parallel are arranged on the testing loop main path, and a compressor, a condenser and an evaporator are arranged on each testing loop branch. The types of refrigerants in the test loop branches are different, and each test loop branch is provided with a switch valve to control the on-off of each test loop branch; the electronic expansion valve to be tested is arranged on the test loop main; the refrigerant flow detection device is used for detecting the refrigerant flow in each test loop branch; the current detection device is used for detecting the current of the electronic expansion valve to be detected; and the controller is used for controlling the refrigerant circulating system, the refrigerant flow detection device and the current detection device. According to the electronic expansion valve service life testing device, the service life of electronic expansion valves under various types of refrigerants can be tested, and the testing efficiency and accuracy are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air processing, in particular to a life test device for an electronic expansion valve. Background Art

[0002] In the refrigeration system, the electronic expansion valve is one of the four core components, and its importance is self-evident. Its main function is to control the refrigerant flow rate, thereby ensuring that the system can achieve heat exchange efficiency under optimal conditions. However, with the continuous development of refrigeration technology and the improvement of environmental protection requirements, new refrigerants such as R32 (difluoromethane Freon refrigerant) and R290 (hydrocarbon refrigerant) have gradually been put into the market and widely used in refrigeration systems. The physical and chemical properties of these new refrigerants are significantly different from those of traditional refrigerants, which poses a higher challenge to the refrigerant resistance and weather resistance life of the electronic expansion valve.

[0003] Existing testing methods are often limited to a single refrigerant condition and cannot fully evaluate the performance of electronic expansion valves under different refrigerants. In order to ensure that electronic expansion valves can work stably and reliably under a variety of refrigerant conditions and meet the market's requirements for their quality stability, it is particularly important to develop a test device that can simulate multiple refrigerant conditions and accurately test the life of electronic expansion valves.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In response to the problems pointed out in the background technology, the present application provides an electronic expansion valve life test device, which can realize life testing of electronic expansion valves under various types of refrigerants, thereby improving the efficiency and accuracy of the test.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0007] In some embodiments of the present application, a device for testing the life of an electronic expansion valve is provided, comprising:

[0008] The refrigerant circulation system includes a compressor, a condenser, an electronic expansion valve to be tested, and an evaporator arranged on the same test loop;

[0009] The refrigerant circulation system comprises a test circuit main circuit, on which a plurality of test circuit branches arranged in parallel are arranged, each test circuit branch is respectively provided with a compressor, a condenser and an evaporator, and the refrigerant type in each test circuit branch is different, and each test circuit branch is provided with a switch valve to control the on and off of each test circuit branch; the electronic expansion valve to be tested is arranged on the test circuit main circuit;

[0010] A refrigerant flow detection device, used to detect the refrigerant flow in each test circuit branch;

[0011] A current detection device, used for detecting the current of the electronic expansion valve to be tested;

[0012] The controller is used to control the refrigerant circulation system, the refrigerant flow detection device and the current detection device.

[0013] The refrigerant circulation system includes multiple test circuit branches arranged in parallel, and different refrigerant types can be set to realize life testing of electronic expansion valves under various types of refrigerants, thereby improving the efficiency and accuracy of the test.

[0014] In some embodiments of the present application, the refrigerant flow detection device is arranged on the main circuit of the test circuit. The structure is simple, and only one refrigerant flow detection device is required, which saves costs.

[0015] In some embodiments of the present application, a power supply voltage regulator is further included, which is connected to the electronic expansion valve to be tested and is used to adjust the input voltage of the electronic expansion valve to be tested. The power supply voltage regulator is an adjustable power supply that can simulate voltage instability.

[0016] In some embodiments of the present application, a combustion generating device is further included, which is used to generate gas containing oil or smoke by combustion, and the gas containing oil or smoke is used to test the service life of the electronic expansion valve to be tested in an oil smoke environment. The combustion generating device can generate oil smoke gas and can simulate an oil smoke environment.

[0017] In some embodiments of the present application, a combustion test blower is further included, and the combustion test blower is used to deliver the wind containing oil or smoke generated by the combustion generating device to the electronic expansion valve to be tested.

[0018] In some embodiments of the present application, a display device is further included, and the display device is used to display the use status of the electronic expansion valve life test device. The display device can display the status of the device and the status of the electronic expansion valve to be tested in real time and intuitively.

[0019] In some embodiments of the present application, the controller is a programmable logic controller; the display device is a touch screen, and the touch screen is connected to the controller for communication.

[0020] In some embodiments of the present application, a cloud server, a touch screen gateway and a client are also included; the controller is connected to the cloud server through the touch screen gateway to exchange data, and the cloud server is connected to the client to exchange data. The data is uploaded locally through the Internet of Things gateway, and the cloud platform monitors, and the test device can be monitored and operated remotely.

[0021] In some embodiments of the present application, the refrigerant type in the test loop branch includes two or more of R22, R290, R410A, R407C and R32, and the refrigerant cold type includes common air conditioning refrigerants.

[0022] In some embodiments of the present application, a first fan and a second fan are further included; the first fan is arranged on one side of the evaporator to accelerate the air flow around the evaporator; the second fan is arranged on one side of the condenser to accelerate the air flow around the condenser.

[0023] Compared with the prior art, the advantages and positive effects of the utility model are:

[0024] The electronic expansion valve life test device in the above embodiment can realize life testing of electronic expansion valves under various types of refrigerants according to the specific needs of the research and development project, thereby significantly improving the efficiency and accuracy of the test; through the current detection device and the refrigerant flow detection device, real-time detection and formation of a changing curve are performed, so that researchers can intuitively observe the performance deviation ratio and specific failure time point of the electronic expansion valve to be tested during the entire test cycle, providing data support for product development and improvement.

[0025] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of a conventional air conditioner refrigeration cycle system is shown;

[0028] Figure 2 A schematic diagram of an electronic expansion valve life test device according to some embodiments is shown;

[0029] Figure 3 A schematic diagram showing a refrigerant circulation system in an electronic expansion valve life test device according to some embodiments is shown;

[0030] Figure 4 A schematic diagram of testing of a refrigerant through a B1 test circuit branch according to some embodiments is shown;

[0031] Figure 5A schematic diagram showing a refrigerant circulation system in an electronic expansion valve life test device according to other embodiments;

[0032] Figure 6 shows a flow state parameter curve of an electronic expansion valve to be tested according to some embodiments;

[0033] Figure 7 shows a current state parameter curve of an electronic expansion valve to be tested according to some embodiments;

[0034] Figure 8 A test flow chart of an electronic expansion valve life test device according to some embodiments is shown;

[0035] Fig. 9 A schematic diagram showing a smoke mode of the electronic expansion valve life test device according to some embodiments is shown;

[0036] Fig.10 A data transmission schematic diagram of an electronic expansion valve life test device according to some embodiments is shown;

[0037] Description of reference numerals:

[0038] 1- Controller;

[0039] 21-compressor; 22-condenser; 23-evaporator; 24-electronic expansion valve to be tested;

[0040] 25- switch valve;

[0041] 3- Refrigerant flow detection device;

[0042] 4-Current detection device;

[0043] 51-combustion generating device; 52-combustion test fan;

[0044] 6-power supply voltage regulating device; 71-first fan; 72-second fan;

[0045] 81 - touch screen; 82 - touch screen gateway; 83 - cloud server; 84 - client; 85 - test system server. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0052] Existing air conditioners generally have an outdoor unit and at least one indoor unit. The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an electronic expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0053] like Figure 1 As shown, low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and high-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, and the heat is released to the surrounding environment through the condensation process.

[0054] The electronic expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0055] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0056] 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 conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0057] like Figure 2-Figure 10 As shown, some embodiments of the present application provide an electronic expansion valve life testing device for testing the service life of an electronic expansion valve.

[0058] like Figure 2As shown, the electronic expansion valve life test device includes a controller 1, a refrigerant circulation system, a refrigerant flow detection device 3 and a current detection device 4.

[0059] The refrigerant circulation system includes a compressor 21, a condenser 22, an electronic expansion valve 24 to be tested, and an evaporator 23 which are arranged on the same test loop.

[0060] Specifically, Figure 2 As shown, the refrigerant circulation system includes a test circuit main line M, on which a plurality of test circuit branches B1 / B2 / B3 / B4 / B5······ are arranged in parallel.

[0061] The electronic expansion valve 24 to be tested is arranged on the main circuit of the test circuit.

[0062] A compressor 21, a condenser 22 and an evaporator 23 are respectively arranged on each test loop branch.

[0063] The refrigerant type in each test circuit branch is different.

[0064] Each test circuit branch is provided with a switch valve 25 to control the on-off of each test circuit branch.

[0065] like Figure 4 By controlling the switch valve 25, different test circuit branches, that is, different refrigerant types, can be selected for testing.

[0066] The refrigerant flow detection device 3 is used to detect the refrigerant flow in each test circuit branch.

[0067] A refrigerant flow detection device 3 may be provided in the test circuit main circuit. Figure 5 As shown, a refrigerant flow detection device 3 is provided on each test circuit branch.

[0068] The current detection device 4 is used to detect the current of the electronic expansion valve 24 to be tested.

[0069] Specifically, the current detection device 4 can detect the operating current of the expansion valve itself through the Hall effect, convert it into a voltage signal, and then transmit it to the controller 1.

[0070] The controller 1 is used to control the refrigerant circulation system, the refrigerant flow detection device 3 and the current detection device 4, and can perform data conversion and data output according to the set operation logic.

[0071] The principle of electronic expansion valve life test is:

[0072] The refrigerant flow detection device 3 detects the actual flow value of the corresponding steps of the electronic expansion valve 24 to be tested during operation, and compares it with the nominal flow value of the corresponding steps of the electronic expansion valve 24 to be tested. If the relative error is greater than the preset ratio, it is determined that the electronic expansion valve 24 to be tested has failed.

[0073] The current detection device 4 detects the actual current value of the electronic expansion valve 24 to be tested during operation. If the actual current value is greater than the preset current value, or the actual current value is zero, it is determined that the electronic expansion valve 24 to be tested is stuck or broken.

[0074] When using this test device, the test parameters must be set according to the test benchmark. The test parameters include the total test time, the action frequency of the electronic expansion valve 24 to be tested, the preset ratio of flow determination, and the refrigerant type.

[0075] The total testing time can be set according to needs, for example, it can be set to 3-6 months.

[0076] The action frequency is the opening adjustment interval time and the action steps of the electronic expansion valve 24 to be tested, such as the opening adjustment interval time is 20s and the action steps are 200 steps.

[0077] The preset ratio of flow determination is used to compare with the relative error between the actual flow value and the nominal flow value to determine whether the electronic expansion valve 24 to be tested has failed, and is set to 20%.

[0078] The refrigerant type is selected according to the actual refrigerant type in the test device.

[0079] See also Figure 8 After setting the test parameters, the controller 1 drives the electronic expansion valve 24 to be tested according to the set requirements and opens the switch valve 25 corresponding to the refrigerant test. At the same time, it receives feedback from the current detection device 4, the refrigerant flow monitoring device and the electronic expansion valve 24 to be tested, forms a state parameter curve, performs real-time monitoring, and records its specific offset curve and failure time.

[0080] like Figure 6 As shown, it is a flow state parameter curve, the X coordinate is the number of expansion valve steps to be tested, and the Y coordinate is the flow rate. The flow upper limit varies according to the different upper limits of the expansion valve opening to be tested.

[0081] like Figure 7 As shown, it is a current state parameter curve, the X coordinate is the number of expansion valve steps to be tested, and the Y coordinate is the current. The flow upper limit is a preset current value. If the actual current value is greater than the preset current value, or the actual current value is 0, it is determined that the electronic expansion valve 24 to be tested is stuck or disconnected.

[0082] The electronic expansion valve life test device of the present application can realize life testing of electronic expansion valves under various types of refrigerants according to the specific needs of the research and development project, thereby significantly improving the efficiency and accuracy of the test; through the real-time detection and formation of the changing curve by the current detection device 4 and the refrigerant flow detection device 3, researchers can intuitively observe the performance deviation ratio and specific failure time point of the electronic expansion valve 24 to be tested during the entire test cycle, providing data support for product development and improvement.

[0083] In some embodiments of the present application, the refrigerant flow detection device 3 is disposed on the main circuit of the test loop, and only one refrigerant flow detection device 3 may be provided to reduce the test cost. The refrigerant flow detection device 3 may be a refrigerant flow meter.

[0084] In some embodiments of the present application, the electronic expansion valve life testing device further includes a power supply voltage regulating device 6 .

[0085] The power supply voltage regulating device 6 is connected to the electronic expansion valve 24 to be tested, and is used to adjust the input voltage of the electronic expansion valve 24 to be tested, so as to simulate the voltage instability condition.

[0086] When the power supply voltage regulating device 6 is provided, the test parameters set by the test device also include the voltage fluctuation range, fluctuation time and adjustment amplitude, such as the voltage fluctuation range is 10-14V, the fluctuation time (cycle time) is 4h, and the voltage adjustment amplitude value is 0.4V.

[0087] In some embodiments of the present application, Fig. 9 As shown, the electronic expansion valve life test device also includes a combustion generating device 51.

[0088] The burning oil or burning cotton is placed in the combustion generating device 51 and ignited, and the combustion can generate gas with oil or smoke, which can simulate the oil smoke environment. The gas with oil or smoke is sent to the electronic expansion valve 24 to be tested, and the service life of the electronic expansion valve 24 to be tested in the oil smoke environment can be tested.

[0089] The combustion generating device 51 can simulate multiple places involving high oil and heavy smoke, such as kitchens and smoking rooms, so that the test effect is closer to actual use.

[0090] When the combustion generating device 51 is provided, the test parameters are also set to include whether to turn on the oil smoke mode.

[0091] Furthermore, the electronic expansion valve life test device also includes a combustion test fan 52, which is used to send the wind containing oil or smoke generated by the combustion generating device 51 into the electronic expansion valve 24 to be tested.

[0092] In some embodiments of the present application, the electronic expansion valve life testing device further includes a display device.

[0093] The display device is used to display the use status of the electronic expansion valve life test device, for example, it can display the state parameter curve of the electronic expansion valve 24 to be tested in real time.

[0094] Controller 1 is a programmable logic controller (PLC), which can perform data conversion and digital output according to the set operation logic.

[0095] The display device is a touch screen 81, which is connected to the controller 1. By communicating with the controller 1, the controller 1 can send data such as the device usage status and measurement values ​​to the touch screen 81 for display, and the touch screen 81 can also send user control commands or parameter settings and other information to the controller 1.

[0096] In some embodiments of the present application, five test circuit branches are provided, and the refrigerant types in the test circuit branches are R22, R290, R410A, R407C and R32, which are commonly used air conditioning refrigerant types.

[0097] In some embodiments of the present application, the electronic expansion valve life testing device further includes a first fan 71 .

[0098] The first fan 71 is disposed at one side of the evaporator 23 to accelerate the air flow around the evaporator 23 .

[0099] In some embodiments of the present application, the electronic expansion valve life testing device further includes a second fan 72 .

[0100] The second fan 72 is disposed at one side of the condenser 22 to accelerate the air flow around the condenser 22 .

[0101] In some embodiments of the present application, Fig.10 As shown, the electronic expansion valve life test device also includes a cloud server 83 and a client 84. The controller 1 is connected to the cloud server 83 for data exchange, and the cloud server 83 is connected to the client 84 for data exchange.

[0102] The client 84 may be a terminal device such as a mobile phone, on which an APP program is installed.

[0103] In some embodiments of the present application, the electronic expansion valve life test device further includes a touch screen gateway 82 , which reads internal parameters of the controller 1 through the touch screen 81 and uploads the parameters to the test system server 85 .

[0104] Specifically, the controller 1 and the touch screen 81 perform data transmission via RS485 communication.

[0105] The touch screen gateway 82 and the test system server 85 perform data exchange via an Internet channel, and the Internet channel is implemented in a manner including WIFI, 4G, and an Ethernet port.

[0106] All local device information in the test system is collected to the touch screen gateway 82 through the PLC communication line, and the touch screen gateway 82 then uploads the local device information to the cloud server 83.

[0107] When the cloud server 83 sends a control instruction, the touch screen gateway 82 performs protocol analysis and script operation, and then sends the control instruction to the local test device.

[0108] The APP program on the terminal device serves as a human-computer interaction interface of the test device, which facilitates the test personnel to remotely monitor and operate. The APP program screen on the terminal device is consistent with the screen on the local touch screen 81.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0110] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An electronic expansion valve life test device, comprising: The refrigerant circulation system includes a compressor, a condenser, an electronic expansion valve to be tested, and an evaporator arranged on the same test loop; It is characterized by further comprising: The refrigerant circulation system comprises a test circuit main circuit, on which a plurality of test circuit branches arranged in parallel are arranged, each test circuit branch is respectively provided with a compressor, a condenser and an evaporator, and the refrigerant type in each test circuit branch is different, and each test circuit branch is provided with a switch valve to control the on and off of each test circuit branch; the electronic expansion valve to be tested is arranged on the test circuit main circuit; A refrigerant flow detection device, used to detect the refrigerant flow in each test circuit branch; A current detection device, used for detecting the current of the electronic expansion valve to be tested; The controller is used to control the refrigerant circulation system, the refrigerant flow detection device and the current detection device.

2. The electronic expansion valve life test device according to claim 1, characterized in that: The refrigerant flow detection device is arranged on the main line of the test circuit.

3. The electronic expansion valve life test device according to claim 1, characterized in that: It also includes a power supply voltage regulating device, which is connected to the electronic expansion valve to be tested and is used to adjust the input voltage of the electronic expansion valve to be tested.

4. The electronic expansion valve life test device according to claim 1, characterized in that: It also includes a combustion generating device for burning and generating gas containing oil or smoke, and the gas containing oil or smoke is used to test the service life of the electronic expansion valve to be tested in an oil smoke environment.

5. The electronic expansion valve life test device according to claim 4, characterized in that: It also includes a combustion test fan, which is used to send the wind containing oil or smoke generated by the combustion generating device to the electronic expansion valve to be tested.

6. The electronic expansion valve life test device according to claim 1, characterized in that: It also includes a display device, which is used to display the use status of the electronic expansion valve life testing device.

7. The electronic expansion valve life test device according to claim 6, characterized in that: The controller is a programmable logic controller; the display device is a touch screen, and the touch screen is connected to the controller for communication.

8. The electronic expansion valve life test device according to claim 1, characterized in that: It also includes a cloud server, a touch screen gateway and a client; the controller is connected to the cloud server through the touch screen gateway to exchange data, and the cloud server is connected to the client to exchange data.

9. The electronic expansion valve life test device according to claim 1, characterized in that: The refrigerant types in the test loop branch include two or more of R22, R290, R410A, R407C and R32.

10. The electronic expansion valve life test device according to claim 1, characterized in that: It also includes a first fan and a second fan; the first fan is arranged at one side of the evaporator to accelerate the air flow around the evaporator; the second fan is arranged at one side of the condenser to accelerate the air flow around the condenser.

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