Control method of air conditioning apparatus and air conditioning apparatus
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-30
AI Technical Summary
In existing air conditioning equipment, the problem of leakage from the electronic expansion valve when it is closed leads to refrigerant leakage into the underfloor heating system, affecting cooling efficiency.
By obtaining the temperature difference between the refrigerant pipe and the indoor environment, it is determined whether the electronic expansion valve is leaking. Based on the temperature difference, the opening degree of the electronic expansion valve is controlled to close it, including increasing and decreasing the number of steps to remove foreign objects or solve the problem of missing steps, so as to ensure the tightness of the electronic expansion valve.
It effectively prevents refrigerant pipe condensation, improves the working efficiency and control accuracy of air conditioning equipment, prevents mechanical damage, and ensures normal equipment operation.
Smart Images
Figure CN122305597A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of air conditioning equipment technology, and specifically provides a control method for air conditioning equipment and air conditioning equipment. Background Technology
[0002] As people's living standards improve, air conditioners have gradually become one of the essential household appliances in people's daily lives.
[0003] Underfloor heating air conditioning is a type of air conditioning system. Existing underfloor heating air conditioning systems consist of two systems: a refrigeration system composed of an outdoor unit and an indoor unit, and a heating system composed of the outdoor unit and the underfloor heating system. The indoor unit and the underfloor heating system are connected in parallel. When the underfloor heating air conditioning system is running in cooling or dehumidification mode, it closes the electronic expansion valve that controls the flow of air to the underfloor heating system, thereby delivering air cooling through the indoor unit. However, due to foreign matter entering the electronic expansion valve or loss of synchronization due to prolonged use, the electronic expansion valve may not close tightly, causing refrigerant to leak into the underfloor heating system, which in turn leads to a decrease in the cooling efficiency of the underfloor heating air conditioning system.
[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention
[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem of leakage of electronic expansion valves in existing air conditioning equipment when they are closed.
[0006] In a first aspect, the present invention provides a control method for an air conditioning device, characterized in that the air conditioning device includes an outdoor unit, an indoor unit, and a floor heating assembly, wherein the indoor unit and the floor heating assembly are connected in parallel and both are connected to the outdoor unit, the floor heating assembly includes a refrigerant pipe and an electronic expansion valve installed on the refrigerant pipe, the two ends of the refrigerant pipe are connected to the outlet end and the inlet end of the outdoor unit, and the control method includes: closing the electronic expansion valve when the air conditioning device is operating in cooling or dehumidification mode; acquiring the temperature of the refrigerant pipe and recording it as a first temperature; acquiring the temperature of the indoor environment and recording it as a second temperature; determining whether the electronic expansion valve is leaking based on the first temperature and the second temperature; and controlling the electronic expansion valve to perform a first closing operation when it is determined that the electronic expansion valve is leaking.
[0007] In the preferred embodiment of the control method for the above-mentioned air conditioning equipment, the step of "determining whether the electronic expansion valve is leaking based on the first temperature and the second temperature" specifically includes: subtracting the second temperature from the first temperature to obtain a first difference; and determining whether the electronic expansion valve is leaking based on the first difference.
[0008] In the preferred embodiment of the control method for the aforementioned air conditioning equipment, the step of "determining whether the electronic expansion valve is leaking based on the first difference" specifically includes: comparing the first difference with a preset value; if the first difference is greater than the preset value, then determining that the electronic expansion valve is leaking; if the first difference is not greater than the preset value, then determining that the electronic expansion valve is not leaking; or the step of "determining whether the electronic expansion valve is leaking based on the first difference" specifically includes: comparing the first difference with a preset value; if the first difference is greater than the preset value and the duration for which the first difference is greater than the preset value is greater than a first preset time, then determining that the electronic expansion valve is leaking; if the first difference is not greater than the preset value or the first difference is greater than the preset value but the duration for which the first difference is greater than the preset value is not greater than the first preset time, then determining that the electronic expansion valve is not leaking.
[0009] In the preferred embodiment of the control method for the above-mentioned air conditioning equipment, the step of "controlling the electronic expansion valve to perform a first closing operation" specifically includes: first controlling the opening of the electronic expansion valve to increase by a first preset number of steps; then controlling the opening of the electronic expansion valve to decrease by a second preset number of steps; wherein the second preset number of steps is greater than the first preset number of steps.
[0010] In a preferred embodiment of the control method for the aforementioned air conditioning equipment, the control method further includes: after the electronic expansion valve completes the first closing operation and a second preset time has elapsed, re-acquiring the temperature of the refrigerant pipe and recording it as a third temperature; re-acquiring the temperature of the indoor environment and recording it as a fourth temperature; determining whether the electronic expansion valve is still leaking based on the third temperature and the fourth temperature; and if it is determined that the electronic expansion valve is still leaking, controlling the electronic expansion valve to perform a second closing operation.
[0011] In the preferred embodiment of the control method for the above-mentioned air conditioning equipment, the step of "determining whether the electronic expansion valve is still leaking based on the third temperature and the fourth temperature" specifically includes: subtracting the fourth temperature from the third temperature to obtain a second difference; and determining whether the electronic expansion valve is still leaking based on the second difference.
[0012] In the preferred embodiment of the control method for the aforementioned air conditioning equipment, the step of "determining whether the electronic expansion valve is still leaking based on the second difference" specifically includes: comparing the second difference with a preset value; if the second difference is greater than the preset value, then determining that the electronic expansion valve is still leaking; if the second difference is not greater than the preset value, then determining that the electronic expansion valve is no longer leaking; or the step of "determining whether the electronic expansion valve is still leaking based on the second difference" specifically includes: comparing the second difference with a preset value; if the second difference is greater than the preset value and the duration for which the second difference is greater than the preset value is greater than a first preset time, then determining that the electronic expansion valve is still leaking; if the second difference is not greater than the preset value or the second difference is greater than the preset value but the duration for which the second difference is greater than the preset value is not greater than the first preset time, then determining that the electronic expansion valve is no longer leaking.
[0013] In a preferred embodiment of the control method for the aforementioned air conditioning equipment, when it is determined that the electronic expansion valve no longer leaks, the control method includes: controlling the opening of the electronic expansion valve to increase by a third preset number of steps; wherein the sum of the third preset number of steps and the first preset number of steps is not greater than the second preset number of steps.
[0014] In the preferred embodiment of the control method for the above-mentioned air conditioning equipment, the step of "controlling the electronic expansion valve to perform a second closing operation" specifically includes: first controlling the opening of the electronic expansion valve to increase by a fourth preset number of steps; then controlling the opening of the electronic expansion valve to decrease by a fifth preset number of steps; wherein, the fifth preset number of steps is greater than the fourth preset number of steps and the difference between the fifth preset number of steps and the fourth preset number of steps is greater than the difference between the second preset number of steps and the first preset number of steps.
[0015] In a second aspect, the present invention also provides an air conditioning device, the air conditioning device including a controller.
[0016] Those skilled in the art will understand that, in the preferred embodiment of the present invention, the air conditioning device of the present invention obtains the temperature of the refrigerant pipe and the temperature of the indoor environment, and subtracts the temperature of the indoor environment from the temperature of the refrigerant pipe to obtain a first difference. The first difference is compared with a preset value. When the first difference is greater than the preset value, it indicates that the electronic expansion valve is leaking, and some refrigerant flows into the refrigerant pipe, causing the temperature of the refrigerant pipe to drop. At this time, the electronic expansion valve is controlled to perform a first closing operation, thereby preventing the refrigerant pipe from condensing due to leakage of the electronic expansion valve and ensuring the working efficiency of the air conditioning device.
[0017] Furthermore, when the first difference is greater than a preset value, the air conditioning device of the present invention can determine whether the duration of the first difference being greater than the preset value is greater than a first preset time, thereby avoiding inaccurate data caused by abnormal temperature detection device, and thus improving the control accuracy of the air conditioning device.
[0018] Furthermore, the step of the control electronic expansion valve of the air conditioning device of the present invention performing the first closing operation is as follows: first, control the opening degree of the electronic expansion valve to increase by a first preset number of steps, and then control the opening degree of the electronic expansion valve to decrease by a second preset number of steps, wherein the second preset number of steps is greater than the first preset number of steps. By opening small and closing large, foreign objects in the electronic expansion valve can be discharged or problems such as the electronic expansion valve losing its steps can be solved, thereby closing the electronic expansion valve tightly.
[0019] Furthermore, after the air conditioning device of the present invention completes the first closing operation of the electronic expansion valve and reaches the second preset time, it re-obtains the temperature of the refrigerant pipe and the temperature of the indoor environment, and subtracts the temperature of the indoor environment from the temperature of the refrigerant pipe to obtain a second difference. The second difference is compared with a preset value. When the second difference is greater than the preset value, it indicates that there is still a leakage problem in the electronic expansion valve. At this time, the electronic expansion valve is controlled to perform a second closing operation, thereby avoiding the reduction of the working efficiency of the air conditioning device due to leakage of the electronic expansion valve.
[0020] Furthermore, when the second difference is greater than a preset value, the air conditioning device of the present invention can determine whether the duration of the second difference being greater than the preset value is greater than a first preset time, thereby avoiding inaccurate data caused by abnormal temperature detection device, and thus improving the control accuracy of the air conditioning device.
[0021] Furthermore, when the air conditioning device of the present invention determines that the electronic expansion valve is no longer leaking, it controls the opening of the electronic expansion valve to increase by a third preset number of steps, thereby preventing the electronic expansion valve from closing too tightly and causing mechanical damage to the electronic expansion valve.
[0022] Furthermore, the step of controlling the electronic expansion valve to perform the second closing operation in the air conditioning device of the present invention is as follows: first, control the opening degree of the electronic expansion valve to increase by a fourth preset number of steps; then control the opening degree of the electronic expansion valve to decrease by a fifth preset number of steps; wherein, the fifth preset number of steps is greater than the fourth preset number of steps and the difference between the fifth preset number of steps and the fourth preset number of steps is greater than the difference between the second preset number of steps and the first preset number of steps. By setting the difference between the fifth preset number of steps and the fourth preset number of steps to be greater than the difference between the second preset number of steps and the first preset number of steps, that is, by further increasing the number of steps of opening and closing the electronic expansion valve, foreign objects in the electronic expansion valve can be discharged or problems such as the electronic expansion valve losing steps can be solved, thereby closing the electronic expansion valve tightly. Attached Figure Description
[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
[0024] Figure 1 This is a schematic diagram of the air conditioning device of the present invention;
[0025] Figure 2 This is a flowchart of the control method for the air conditioning equipment of the present invention;
[0026] Figure 3 This is a flowchart of an embodiment of the control method for the air conditioning device of the present invention.
[0027] List of reference numerals in the attached diagram:
[0028] 1. Outdoor unit;
[0029] 2. Refrigerant pipe;
[0030] 3. Indoor unit;
[0031] 4. Electronic expansion valve;
[0032] 51. First three-way valve; 52. Second three-way valve. Detailed Implementation
[0033] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0034] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that although the steps of the control method of the present invention are described in a specific order in this application, this order is not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in different orders. For example, the execution order of steps S200 and S300 of the control method of the present invention can be interchanged, or steps S200 and S300 can be performed simultaneously. The adjusted technical solution is equivalent to the technical solution described in this application and therefore will also fall within the protection scope of the present invention.
[0035] It should be noted that in the description of this invention, terms such as "inner," "outer," "top," and "bottom," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0036] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connect," and "install" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0037] Based on the background technology, which points out the problem of leakage in the closed state of electronic expansion valves in existing air conditioning equipment, this invention provides a control method and air conditioning equipment for air conditioning equipment. The method aims to obtain the temperature of the refrigerant pipe and the temperature of the indoor environment, subtract the indoor environment temperature from the refrigerant pipe temperature to obtain a first difference, and compare this first difference with a preset value. When the first difference is greater than the preset value, it indicates that the electronic expansion valve is leaking, and some refrigerant flows into the refrigerant pipe, causing the refrigerant pipe temperature to drop. At this time, the electronic expansion valve is controlled to perform a first closing operation, thereby preventing refrigerant pipe condensation due to leakage and ensuring the working efficiency of the air conditioning equipment.
[0038] Specifically, such as Figure 1 As shown, the present invention provides an air conditioning device, which includes an outdoor unit 1, an indoor unit 3, and a floor heating component. The indoor unit 3 and the floor heating component are connected in parallel and are both connected to the outdoor unit 1. The floor heating component includes a refrigerant pipe 2 and an electronic expansion valve 4 installed on the refrigerant pipe 2. The two ends of the refrigerant pipe 2 are connected to the outlet end and the inlet end of the outdoor unit 1.
[0039] For example, such as Figure 1As shown, the outdoor unit 1 and refrigerant pipe 2 of the air conditioning equipment of this invention form a first refrigerant circulation loop through an exhaust pipe and a return pipe. The indoor unit 3 is connected in parallel to the refrigerant pipe 2 through a first three-way valve 51 and a second three-way valve 52. The outdoor unit 1 and the indoor unit 3 form a second refrigerant circulation loop through pipes. The first refrigerant circulation loop can be opened or closed by controlling the on / off state of the electronic expansion valve 4. When the air conditioning equipment is running in heating mode, the electronic expansion valve 4 is opened, and the air conditioning equipment heats simultaneously through the first and second refrigerant circulation loops, greatly improving heating efficiency. When the air conditioning equipment is running in cooling or dehumidification mode, the electronic expansion valve 4 is closed, and cooling is only carried out through the second refrigerant circulation loop. At this time, if refrigerant flows into the refrigerant pipe 2, the temperature of the refrigerant pipe 2 is lower than the indoor ambient temperature, and the refrigerant pipe 2 will condense, causing condensation on the ground, which may lead to the risk of slipping on the floor. However, under long-term use, the electronic expansion valve 4 may lose its synchronization or accumulate foreign objects, which may cause leakage when the electronic expansion valve 4 is closed.
[0040] By acquiring the temperature of refrigerant pipe 2 and the temperature of the indoor environment, and subtracting the indoor environment temperature from the temperature of refrigerant pipe 2 to obtain a first difference, the first difference is compared with a preset value. When the first difference is greater than the preset value, it indicates that the electronic expansion valve 4 is leaking, and some refrigerant flows into the refrigerant pipe 21, causing the temperature of the refrigerant pipe 21 to drop. At this time, the electronic expansion valve is controlled to perform a first closing operation, thereby preventing the refrigerant pipe from condensing due to leakage and ensuring the working efficiency of the air conditioning equipment.
[0041] On the other hand, based on the air conditioning equipment described above, the present invention also provides a control method for the air conditioning equipment, such as... Figure 2 As shown, the control method of the present invention includes the following steps:
[0042] S100: When the air conditioning unit is running in cooling or dehumidification mode, close the electronic expansion valve 4.
[0043] For example, when the air conditioning device of the present invention is running in cooling or dehumidification mode, the refrigerant flowing into the refrigerant pipe 2 will condense, so the electronic expansion valve 4 needs to be closed to prevent the refrigerant from flowing into the refrigerant pipe 2.
[0044] S200: Obtain the temperature of refrigerant pipe 2, denoted as the first temperature T1.
[0045] For example, the refrigerant pipe 2 of the present invention is provided with a first temperature sensor, which can detect the temperature information of the refrigerant pipe 2 and transmit it to the controller of the air conditioning equipment.
[0046] S300: Obtain the indoor ambient temperature, denoted as the second temperature T2.
[0047] For example, the air conditioning device of the present invention is provided with a second temperature sensor in the environment in which it is used, which can detect the temperature information of the indoor environment and transmit it to the controller of the air conditioning device.
[0048] S400: Based on the first temperature T1 and the second temperature T2, determine whether the electronic expansion valve 4 is leaking. If the electronic expansion valve 4 is determined to be leaking, control the electronic expansion valve 4 to perform the first closing operation.
[0049] In other words, if the first temperature T1 and the second temperature T2 are not significantly different, it means that no refrigerant has flowed into the refrigerant pipe 2 and the electronic expansion valve 4 is not leaking. In this case, the electronic expansion valve 4 does not need to perform the first closing operation. If the first temperature T1 and the second temperature T2 are significantly different, it means that refrigerant has flowed into the refrigerant pipe 2 and the electronic expansion valve 4 is leaking. In this case, the electronic expansion valve 4 needs to perform the first closing operation.
[0050] For example, such as Figure 3 As shown, step S400 includes steps S410 to S440.
[0051] S410: Subtract the second temperature T2 from the first temperature T1 to obtain the first difference value D1.
[0052] For example, if the first temperature T1 is 20℃ and the second temperature T2 is 30℃, then the first difference D1 = T2 - T1 = 30℃ - 20℃ = 10℃.
[0053] S420: Compare the first difference D1 with the preset value D0.
[0054] In other words, if the first difference D1 is greater than the preset value D0, it means that the electronic expansion valve 4 is leaking; if the first difference D1 is not greater than the preset value D0, it means that the electronic expansion valve 4 is not leaking.
[0055] S430: If the first difference D1 is not greater than the preset value D0, it is determined that the electronic expansion valve 4 has no leakage.
[0056] For example, the first temperature T1 and the second temperature T2 are 28℃ and 30℃ respectively, D1 = T2 - T1 = 30℃ - 28℃ = 2℃, the preset value D0 is 8℃, the first difference D1 is less than the preset value D0, which means that no refrigerant is flowing into the refrigerant pipe 2 and the electronic expansion valve 4 is not leaking.
[0057] S440: If the first difference D1 is greater than the preset value D0, it is determined that the electronic expansion valve 4 is leaking, and the electronic expansion valve 4 is controlled to perform the first closing operation.
[0058] For example, taking the first temperature T1 and the second temperature T2 as examples, the first temperature T1 and the second temperature T2 of the first group are 20℃ and 33℃ respectively. D1 = T2 - T1 = 33℃ - 20℃ = 13℃. The first difference D1 is greater than the preset value D0, which means that refrigerant has flowed into the refrigerant pipe 2 and the electronic expansion valve 4 has a leakage problem. At this time, it is necessary to control the electronic expansion valve 4 to perform the first closing operation.
[0059] It should be noted that, in order to avoid inaccurate temperature detection due to malfunction of the first and second temperature sensors, which could lead to the air conditioning device misjudging that the electronic expansion valve 4 is leaking, this invention, when the first difference D1 is greater than the preset value D0, can also compare the duration of the first difference D1 with a first preset time. This effectively avoids data inaccuracies caused by temperature sensor malfunctions. For example, the air conditioning device of this invention can continuously acquire multiple first temperatures T1 and second temperatures T2 within 3 minutes. For instance, it can detect the first temperature T1 and second temperature T2 once every 1 minute, that is, detect three sets of first temperatures T1 and second temperatures T2. Three sets of temperature values T1 and T2 can yield three first differences D1. If not all three first differences D1 are greater than the preset value D0, it indicates that the temperature of either the first temperature T1 or the second temperature T2 changes significantly within 3 minutes, which may indicate a problem with the temperature sensor, leading to inaccurate temperature data. If all three first differences D1 are greater than the preset value D0, it indicates that the first temperature T1 is consistently much lower than the second temperature T2 within 3 minutes, suggesting that the cold electronic expansion valve 4 is leaking, causing refrigerant to flow into the refrigerant pipe 2, rather than a temperature sensor malfunction causing incorrect temperature data.
[0060] It should also be noted that the present invention does not limit the method of adjusting the opening of the electronic expansion valve 4. For example, those skilled in the art can directly reduce the opening of the electronic expansion valve 4, or they can first reduce the opening of the electronic expansion valve 4, then increase it, and then reduce it again, or they can first increase the opening of the electronic expansion valve 4, and then reduce it, etc., as long as the electronic expansion valve 4 can be completely closed. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.
[0061] Preferably, the step of controlling the electronic expansion valve 4 to perform the first closing operation specifically includes:
[0062] S450: First, control the opening of the electronic expansion valve 4 to increase by a first preset number of steps; then control the opening of the electronic expansion valve 4 to decrease by a second preset number of steps; wherein the second preset number of steps is greater than the first preset number of steps.
[0063] For example, the electronic expansion valve 4 is first adjusted to be 60 steps larger, and then adjusted to be 100 steps smaller. By opening smaller and closing larger, foreign objects in the electronic expansion valve 4 can be discharged or problems such as the electronic expansion valve 4 losing its steps can be solved, thereby closing the electronic expansion valve 4 tightly.
[0064] It should be noted that the present invention does not limit the number of adjustment steps of the electronic expansion valve 4. For example, those skilled in the art can set the number of adjustment steps to 50 or 65, etc., and the number of adjustment steps to 110 or 115, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.
[0065] Preferably, after the electronic expansion valve 4 has completed the first closing operation and a second preset time has elapsed, the control method further includes the following steps:
[0066] S500: Reacquire the temperature of refrigerant pipe 2, denoted as the third temperature T3.
[0067] For example, 50 minutes after adjusting the opening of the electronic expansion valve 4, the first temperature sensor detects the temperature information of the refrigerant pipe 2 again and transmits it to the controller of the air conditioning equipment.
[0068] S600: Reacquire the indoor ambient temperature, denoted as the fourth temperature T4.
[0069] For example, 50 minutes after adjusting the opening of the electronic expansion valve 4, the second temperature sensor detects the indoor temperature information again and transmits it to the controller of the air conditioning equipment.
[0070] It should be noted that the present invention does not limit the second preset time. For example, those skilled in the art can also set the second preset time to 55 minutes or 60 minutes, etc., as long as it can ensure that the leaked refrigerant in the refrigerant pipe 2 flows back to the outdoor unit 1 and the temperature of the refrigerant pipe 2 is restored. Such adjustment and change of the specific value of the second preset time does not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.
[0071] S700: Based on the third temperature T3 and the fourth temperature T4, determine whether the electronic expansion valve 4 is still leaking. If it is determined that the electronic expansion valve 4 is still leaking, control the electronic expansion valve 4 to perform the second closing operation.
[0072] In other words, if the third temperature T3 and the fourth temperature T4 are not significantly different, it means that the electronic expansion valve 4 has been completely closed and the leakage problem has been solved. If the third temperature T3 and the fourth temperature T4 are significantly different, the electronic expansion valve 4 is still leaking. At this time, it is necessary to control the electronic expansion valve 4 to perform a second closing operation.
[0073] For example, step S700 includes steps S710 to S740.
[0074] S710: Subtract the fourth temperature T4 from the third temperature T3 to obtain the second difference D2.
[0075] For example, if the third temperature T3 is 20℃ and the fourth temperature T4 is 30℃, then the second difference D2 = T4 - T3 = 30℃ - 20℃ = 10℃.
[0076] S720: Compare the second difference D2 with the preset value D0.
[0077] In other words, if the second difference D2 is greater than the preset value D0, it means that the previous adjustment of the opening of the electronic expansion valve 4 did not work and the electronic expansion valve 4 is still leaking. If the second difference D2 is not greater than the preset value D0, it means that the electronic expansion valve 4 has been completely closed by adjusting the opening and is no longer leaking.
[0078] S730: If the second difference D2 is not greater than the preset value D0, then it is determined that the electronic expansion valve 4 no longer leaks.
[0079] For example, the third temperature T3 and the fourth temperature T4 are 28℃ and 30℃ respectively, D2 = T4 - T3 = 30℃ - 28℃ = 2℃, the preset value D0 is 8℃, the second difference D2 is less than the preset value D0, which means that by adjusting the opening of the electronic expansion valve 4 50 minutes ago, the electronic expansion valve 4 has been completely closed and there is no more leakage.
[0080] S740: If the second difference D2 is greater than the preset value D0, it is determined that the electronic expansion valve 4 is still leaking, and the electronic expansion valve 4 is controlled to perform the second closing operation.
[0081] For example, the third temperature T3 and the fourth temperature T4 are 20℃ and 33℃ respectively, D2 = T4 - T3 = 33℃ - 20℃ = 13℃, the preset value D0 is 8℃, and the second difference D2 is greater than the preset value D0, which means that there is still refrigerant flowing into the refrigerant pipe 2, the electronic expansion valve has not been completely closed, and the leakage problem still exists. At this time, it is necessary to control the electronic expansion valve 4 to perform the second closing operation.
[0082] It should be noted that, in order to avoid inaccurate temperature detection due to malfunction of the first and second temperature sensors, which could lead to the air conditioning device misjudging that the electronic expansion valve 4 is leaking, this invention can also compare the duration of the second difference D2 with the first preset time when the second difference D2 is greater than the preset value D0. This can effectively avoid inaccurate data caused by temperature sensor malfunction. For example, the air conditioning device of this invention can reacquire multiple first temperatures T1 and second temperatures T2 within 3 minutes. For example, the first temperature T1 and second temperature T2 are detected once every 1 minute, that is, three sets of first temperatures T1 and second temperatures T2 are detected. The three sets of first temperatures T1 and second temperatures T2 can yield three second differences D2. When the three second differences D2 are not all greater than the preset value D0, it indicates that the temperature of the first temperature T1 or the second temperature T2 has changed significantly within 3 minutes, which may indicate that the temperature sensor is malfunctioning, resulting in inaccurate temperature data. When all three second differences D2 are greater than the preset value D0, it indicates that the first temperature T1 has been consistently much lower than the second temperature T2 within 3 minutes, indicating that the cold electronic expansion valve 4 is still leaking.
[0083] Preferably, when it is determined that the electronic expansion valve 4 no longer leaks, the control method includes:
[0084] S750: Control the opening of the electronic expansion valve 4 to increase by a third preset number of steps; wherein the sum of the third preset number of steps and the first preset number of steps is not greater than the second preset number of steps.
[0085] For example, after the air conditioning device of the present invention controls the electronic expansion valve 4 to perform the first closing operation, the air conditioning device determines that the electronic expansion valve 4 no longer leaks. For example, the first closing operation is to first increase the electronic expansion valve 4 by 60 steps, and then decrease the electronic expansion valve 4 by 100 steps. At this time, the electronic expansion valve 4 no longer leaks. In order to avoid the electronic expansion valve 4 being closed too tightly, which would cause mechanical damage to the electronic expansion valve 4, the electronic expansion valve 4 is then increased by 40 steps, that is, the electronic expansion valve 4 is adjusted to the initial opening degree.
[0086] Preferably, the step of controlling the electronic expansion valve 4 to perform the second closing operation specifically includes:
[0087] S760: First, control the opening of the electronic expansion valve 4 to increase by a fourth preset number of steps; then control the opening of the electronic expansion valve 4 to decrease by a fifth preset number of steps; wherein, the fifth preset number of steps is greater than the fourth preset number of steps and the difference between the fifth preset number of steps and the fourth preset number of steps is greater than the difference between the second preset number of steps and the first preset number of steps.
[0088] For example, the electronic expansion valve 4 is first increased by 60 steps, and then decreased by 200 steps. At this time, the number of adjustment steps is 200-60=140 steps. When performing the first closing operation, the number of adjustment steps is 100-60=40 steps. In this closing operation, by increasing the electronic expansion valve 4 by 200 steps, the opening of the electronic expansion valve 4 is increased, which can further discharge foreign objects in the electronic expansion valve 4 or solve problems such as the electronic expansion valve 4 losing steps, thereby closing the electronic expansion valve 4 tightly.
[0089] It should be noted that after the second closing operation is completed, it is determined that the electronic expansion valve 4 no longer leaks. At this time, the opening of the electronic expansion valve 4 is adjusted back to the initial opening, so as to avoid the electronic expansion valve 4 being closed too tightly, which would cause mechanical wear.
[0090] Preferably, the air conditioning device of the present invention further includes a controller, which is capable of controlling the air conditioning device to perform any of the control methods described above.
[0091] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.
[0092] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.
Claims
1. A control method for an air conditioning device, characterized in that, The air conditioning equipment includes an outdoor unit, an indoor unit, and a floor heating system. The indoor unit and the floor heating system are connected in parallel and both are connected to the outdoor unit. The floor heating system includes refrigerant pipes and an electronic expansion valve installed on the refrigerant pipes. Both ends of the refrigerant pipes are connected to the outlet and inlet ends of the outdoor unit. The control method includes: When the air conditioning equipment is operating in cooling or dehumidification mode, the electronic expansion valve is closed; The temperature of the refrigerant pipe is obtained and recorded as the first temperature; The indoor ambient temperature is obtained and recorded as the second temperature. Based on the first temperature and the second temperature, determine whether the electronic expansion valve is leaking; When a leak is detected in the electronic expansion valve, the electronic expansion valve is controlled to perform a first shut-off operation.
2. The control method for the air conditioning equipment according to claim 1, characterized in that, The step of "determining whether the electronic expansion valve is leaking based on the first temperature and the second temperature" specifically includes: Subtract the second temperature from the first temperature to obtain the first difference; Based on the first difference, it is determined whether the electronic expansion valve is leaking.
3. The control method for the air conditioning equipment according to claim 2, characterized in that, The step of "determining whether the electronic expansion valve is leaking based on the first difference" specifically includes: Compare the first difference with the preset value; If the first difference is greater than the preset value, it is determined that the electronic expansion valve is leaking; If the first difference is not greater than the preset value, then it is determined that the electronic expansion valve has no leakage; or The step of "determining whether the electronic expansion valve is leaking based on the first difference" specifically includes: Compare the first difference with the preset value; If the first difference is greater than the preset value and the duration for which the first difference is greater than the preset value is greater than the first preset time, then it is determined that the electronic expansion valve is leaking. If the first difference is not greater than the preset value, or if the first difference is greater than the preset value but the duration of the first difference being greater than the preset value is not greater than the first preset time, then it is determined that the electronic expansion valve has no leakage.
4. The control method for the air conditioning equipment according to claim 1, characterized in that, The steps of "controlling the electronic expansion valve to perform the first closing operation" specifically include: First, control the opening of the electronic expansion valve to increase by a first preset number of steps; Then control the opening of the electronic expansion valve to decrease by a second preset number of steps; Wherein, the second preset number of steps is greater than the first preset number of steps.
5. The control method for the air conditioning equipment according to claim 4, characterized in that, The control method further includes: After the electronic expansion valve completes the first closing operation and reaches the second preset time, the temperature of the refrigerant pipe is reacquired and recorded as the third temperature. The indoor temperature is re-acquired and recorded as the fourth temperature. Based on the third and fourth temperatures, determine whether the electronic expansion valve is still leaking; If it is determined that the electronic expansion valve is still leaking, then the electronic expansion valve is controlled to perform a second shut-off operation.
6. The control method for the air conditioning equipment according to claim 5, characterized in that, The step of "determining whether the electronic expansion valve is still leaking based on the third and fourth temperatures" specifically includes: Subtracting the third temperature from the fourth temperature yields the second difference. Based on the second difference, it is determined whether the electronic expansion valve is still leaking.
7. The control method for the air conditioning equipment according to claim 6, characterized in that, The step of "determining whether the electronic expansion valve is still leaking based on the second difference" specifically includes: Compare the second difference with the preset value; If the second difference is greater than the preset value, it is determined that the electronic expansion valve is still leaking; If the second difference is not greater than the preset value, then it is determined that the electronic expansion valve is no longer leaking; or The step of "determining whether the electronic expansion valve is still leaking based on the second difference" specifically includes: Compare the second difference with the preset value; If the second difference is greater than the preset value and the duration for which the second difference is greater than the preset value is greater than the first preset time, then it is determined that the electronic expansion valve is still leaking. If the second difference is not greater than the preset value, or if the second difference is greater than the preset value but the duration of the second difference being greater than the preset value is not greater than the first preset time, then it is determined that the electronic expansion valve no longer leaks.
8. The control method for the air conditioning equipment according to claim 5, characterized in that, If it is determined that the electronic expansion valve no longer leaks, the control method includes: Increase the opening of the electronic expansion valve by a third preset number of steps; Wherein, the sum of the third preset number of steps and the first preset number of steps is not greater than the second preset number of steps.
9. The control method for the air conditioning equipment according to claim 5, characterized in that, The steps of "controlling the electronic expansion valve to perform the second closing operation" specifically include: First, control the opening of the electronic expansion valve to increase by a fourth preset number of steps; Then, control the opening of the electronic expansion valve to decrease by a fifth preset number of steps; Wherein, the fifth preset number of steps is greater than the fourth preset number of steps, and the difference between the fifth preset number of steps and the fourth preset number of steps is greater than the difference between the second preset number of steps and the first preset number of steps.
10. An air conditioning device, characterized in that, The air conditioning device includes a controller configured to perform the control method according to any one of claims 1 to 9.