Control method and control device of air conditioner and air conditioner

Abstract

The application discloses a control method and device of an air conditioner and the air conditioner. The control method comprises the following steps: obtaining a current operation mode of the air conditioner; obtaining an oil temperature superheat of a compressor in the current operation mode; and adjusting an operation frequency of the compressor according to the oil temperature superheat. According to the control method of the air conditioner, the control logic is set to first obtain the operation mode of the air conditioner, then determine the oil temperature superheat of the current compressor, and finally adjust and control the operation frequency of the compressor according to the oil temperature superheat, so that the oil temperature superheat state of the compressor can be more accurately obtained, and the operation frequency of the compressor can be timely adjusted and controlled to make the oil temperature superheat return to a normal value when the oil temperature superheat exceeds the normal range. In this way, the refrigerant in the compressor can be prevented from being excessively liquefied and the lubricating oil can be prevented from being diluted, so that the reliability and service life of the compressor are improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner control method, control device, and air conditioner. Background Technology

[0002] During the operation of an air conditioner, the compressor oil sump and receiver tank exchange heat, causing the temperature of the lubricating oil in the compressor oil sump to drop. When the temperature drops, the gaseous refrigerant in the compressor will condense in large quantities in the compressor oil sump and mix with the lubricating oil, resulting in the dilution of the lubricating oil. This reduces the oil's lubricating and sealing properties. Furthermore, operating the compressor without enough oil will cause wear on the moving surfaces, eventually leading to failure. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a control method for an air conditioner that can prevent excessive liquefaction of refrigerant and dilution of lubricating oil within the compressor, thereby improving the reliability and service life of the compressor.

[0004] The present invention also proposes a control device for an air conditioner.

[0005] The present invention also proposes an air conditioner that applies the above-described control method.

[0006] According to a control method for an air conditioner based on a first aspect of the present invention, the method includes the following steps: obtaining the current operating mode of the air conditioner; obtaining the oil temperature superheat of the compressor under the current operating mode; and adjusting the operating frequency of the compressor according to the oil temperature superheat.

[0007] According to the air conditioner control method of the present invention, by setting the control logic to first acquire the operating mode of the air conditioner, then determine the oil superheat of the compressor under the current operating mode, and finally adjust the operating frequency of the compressor based on the oil superheat, the oil superheat state of the compressor can be acquired more accurately. Furthermore, when the oil superheat exceeds the normal range, the compressor operating frequency can be adjusted in a timely manner to bring the oil superheat back to the normal value. This avoids excessive liquefaction of the refrigerant and dilution of the lubricating oil within the compressor, thereby improving the reliability and service life of the compressor. In addition, determining the operating mode before acquiring the oil superheat provides a reference for adjusting the compressor operating frequency, thus making the adjustment of the compressor operating frequency more precise.

[0008] According to some embodiments of the present invention, adjusting the operating frequency of the compressor based on the oil temperature superheat includes: if the oil temperature superheat is less than a preset superheat value, controlling the compressor to operate at a target frequency.

[0009] Further, the target frequency is determined according to the current operating frequency of the compressor and the superheat degree of the oil temperature.

[0010] Still further, the target frequency satisfies: F(Toil) = [ΔT * F1 / 10] + C2, where F(Toil) is the target frequency, ΔT is the superheat degree of the oil temperature, F1 is the current operating frequency of the compressor, and C2 is the frequency compensation correction value.

[0011] According to some embodiments of the present invention, the target frequency satisfies: F(Toil) ≤ F2, where F(Toil) is the target frequency and F2 is the maximum operating frequency of the compressor at the current ambient temperature T4.

[0012] In some embodiments, the preset superheat degree value = ΔT0 + C1, where ΔT0 is the superheat degree threshold of the oil temperature that meets the reliability requirements, and C1 is the oil temperature compensation correction value.

[0013] Further, ΔT0 is determined according to the outdoor ambient temperature T4, and ΔT0 has a positive correlation with T4.

[0014] Still further, the determination of ΔT0 according to the outdoor ambient temperature T4 includes: if T4 ≥ 7°C, then ΔT0 = 5°C; if 2°C < T4 < 7°C, then ΔT0 = 3°C; if T4 ≤ 2°C, then ΔT0 = 0°C.

[0015] According to some embodiments of the present invention, the adjustment of the operating frequency of the compressor according to the superheat degree of the oil temperature further includes: if the superheat degree of the oil temperature is not less than the preset superheat degree value, controlling the compressor to continue to operate at the current frequency.

[0016] In some embodiments, before obtaining the superheat degree of the oil temperature of the compressor in the current operating mode, the following steps are further included: determining that the operating time of the compressor is not less than the preset operating time.

[0017] According to some embodiments of the present invention, the compressor includes: a compressor body, and an oil sump is provided at the lower part of the compressor body; a liquid storage tank, which is provided on the bottom surface of the compressor body and is connected to the compressor body.

[0018] In some embodiments, obtaining the oil superheat of the compressor under the current operating mode includes: if the current operating mode of the air conditioner is cooling mode or dehumidification mode, calculating the oil superheat according to the following formula: ΔT = Toil - T3; if the current operating mode of the air conditioner is heating mode, calculating the oil superheat according to the following formula: ΔT = Toil - T2; where ΔT is the oil superheat, Toil is the oil sump temperature of the compressor, T3 is the coil temperature of the outdoor heat exchanger, and T2 is the coil temperature of the indoor heat exchanger.

[0019] According to a second aspect of the present invention, a control device for an air conditioner includes: a first acquisition module for acquiring the current operating mode of the air conditioner; a second acquisition module for acquiring the oil temperature superheat of the compressor under the current operating mode; and a control module for adjusting the operating frequency of the compressor based on the oil temperature superheat.

[0020] According to the control device of the air conditioner of the present invention, the operating frequency of the compressor can be better controlled, the refrigerant dilution of lubricating oil can be reduced, and the reliability and service life of the compressor can be improved.

[0021] Furthermore, the second acquisition module includes a data acquisition unit and a calculation unit. The data acquisition unit is used to acquire the oil sump temperature, outdoor ambient temperature, and coil temperature of the compressor. The calculation unit calculates and acquires the oil temperature superheat of the compressor under the current operating mode based on the data acquired by the data acquisition unit.

[0022] An air conditioner according to a third aspect of the present invention includes: a control device according to a second aspect of the present invention.

[0023] According to the air conditioner of the present invention, by employing the control device in the above embodiments, the operating frequency of the compressor can be better controlled, the lubricating oil in the compressor can be prevented from being dissolved and diluted by the refrigerant, the operating reliability of the compressor can be improved, and thus the reliability of the air conditioner system can be improved.

[0024] Furthermore, the compressor includes: a compressor body, the lower part of which has an oil sump; and a liquid storage tank, which is disposed on the bottom surface of the compressor body and connected to the compressor body.

[0025] Furthermore, the air conditioner includes a memory, a processor, and a control program for the air conditioner stored in the memory and executable on the processor. When the processor executes the control program for the air conditioner, it implements the control method for the air conditioner according to the first aspect of the present invention.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] Figure 1 This is a control flowchart of an air conditioner control method according to an embodiment of the present invention;

[0028] Figure 2 This is a control flowchart of an air conditioner in cooling or dehumidification mode.

[0029] Figure 3 This is the control flowchart of the air conditioner in heating mode;

[0030] Figure 4 This is a schematic diagram of an air conditioner according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the control device of an air conditioner according to an embodiment of the present invention;

[0032] Figure 6 yes Figure 5 A schematic diagram of the second acquisition module shown;

[0033] Figure 7 yes Figure 5 A schematic diagram of the control module shown;

[0034] Figure 8 This is a schematic diagram of an air conditioner according to the fourth aspect of the present invention.

[0035] Figure label:

[0036] Air conditioner 100:

[0037] Compressor 1, compressor body 11, exhaust port 111, liquid receiver 12, return port 121, insulation chamber 13.

[0038] 2. Outdoor heat exchanger; 3. Throttling device; 4. Four-way valve; 5. Indoor heat exchanger.

[0039] Control device 6, first acquisition module 61, second acquisition module 62, acquisition unit 621, calculation unit 622.

[0040] Control module 63, comparison unit 631, control unit 632, memory 7, processor 8. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following is for reference. Figures 1-4 A control method for an air conditioner according to an embodiment of the first aspect of the present invention is described.

[0043] refer to Figures 1-3 According to an embodiment of the present invention, the control method for an air conditioner includes the following steps: obtaining the current operating mode of the air conditioner; obtaining the oil temperature superheat of the compressor under the current operating mode; and adjusting the operating frequency of the compressor according to the oil temperature superheat.

[0044] Specifically, an air conditioner can be a cooling air conditioner, a heating air conditioner, or a cooling and heating air conditioner. During the operation of an air conditioner, heat exchange occurs between the compressor oil sump and the low-temperature receiver drier, causing the temperature of the lubricating oil in the compressor oil sump to drop. When the temperature of the gaseous refrigerant in the compressor drops, a large amount of it will condense in the compressor oil sump and dissolve in the lubricating oil, resulting in the dilution of the lubricating oil. This reduces the lubrication and sealing effect of the oil. Furthermore, operating the compressor without sufficient oil will lead to wear on the moving surfaces and ultimately failure.

[0045] Because the oil temperature in the compressor oil pan and the compressor operating frequency may differ under different operating modes of the air conditioner, this embodiment first obtains the current operating mode of the air conditioner to ensure that the compressor oil temperature superheat is within the normal range. For example, the current operating mode of the air conditioner can be one of cooling mode, heating mode, and dehumidification mode. After determining the current operating mode of the air conditioner, the compressor oil temperature superheat under that operating mode is obtained. Then, the compressor operating frequency is adjusted according to the oil temperature superheat. For example, when the oil temperature superheat is less than the superheat threshold of that operating mode, the compressor operating frequency can be increased to bring the oil temperature superheat back to the normal range; or, when the oil temperature superheat exceeds the normal superheat threshold by a large margin, the compressor operating frequency can be decreased; or, when the oil temperature superheat is greater than or equal to the superheat threshold and the difference is small, the compressor can be kept running at the current operating frequency.

[0046] According to the air conditioner control method of the present invention, by setting the control logic to first acquire the operating mode of the air conditioner, then determine the oil superheat of the compressor under the current operating mode, and finally adjust the operating frequency of the compressor based on the oil superheat, the oil superheat state of the compressor can be acquired more accurately. Furthermore, when the oil superheat exceeds the normal range, the compressor operating frequency can be adjusted in a timely manner to bring the oil superheat back to the normal value. This avoids excessive liquefaction of the refrigerant and dilution of the lubricating oil within the compressor, thereby improving the reliability and service life of the compressor. In addition, determining the operating mode before acquiring the oil superheat provides a reference for adjusting the compressor operating frequency, thus making the adjustment of the compressor operating frequency more precise.

[0047] According to some embodiments of the present invention, reference Figure 2 and Figure 3 The step of adjusting the operating frequency of the compressor based on the oil temperature superheat includes: if the oil temperature superheat is less than a preset superheat value, controlling the compressor to operate at the target frequency.

[0048] Specifically, when the oil temperature superheat is less than the preset superheat value, it indicates that the oil temperature in the compressor oil sump and the receiver tank are relatively close, meaning the oil temperature in the compressor oil sump is low. This suggests that a significant amount of gaseous refrigerant is liquefying and dissolving in the lubricating oil. In this case, increasing the compressor's operating frequency can quickly raise the compressor's return gas temperature, thereby raising the oil temperature. The liquid refrigerant in the oil sump then vaporizes and separates from the lubricating oil at high temperatures. This allows the oil temperature superheat to return to the normal range, ensuring the compressor's normal operation.

[0049] Furthermore, the target frequency is determined based on the current operating frequency of the compressor and the oil temperature superheat.

[0050] Specifically, refer to Figure 2 and Figure 3 Since increasing the compressor's operating frequency can increase the oil temperature superheat, and the compressor determines the target frequency to be increased based on the current oil temperature superheat, determining the target frequency based on the strong correlation between the current operating frequency and the current oil temperature superheat is more accurate, making the compressor's frequency control more scientific and precise.

[0051] Furthermore, the target frequency satisfies: F(Toil) = [ΔT*F1 / 10] + C2, where F(Toil) is the target frequency, ΔT is the oil superheat, Toil is the compressor oil sump temperature, F1 is the compressor's current operating frequency, and C2 is the frequency compensation correction value. Thus, by setting the frequency compensation correction value, frequency errors can be reduced, the accuracy of the compressor's operating frequency can be improved, and the compressor's oil superheat can be better controlled within the normal range, ensuring reliable compressor operation.

[0052] In a specific example, the range of C2 is: C2≥1, and C2 is an integer. For example, the value of C2 can be 1, 2, 3, 4 or 5. Of course, the value of C2 needs to be reasonably determined based on experimental data or empirical values.

[0053] According to some embodiments of the present invention, the target frequency satisfies: F(Toil)≤F2, where F(Toil) is the target frequency and F2 is the maximum operating frequency of the compressor at the current ambient temperature T4.

[0054] In other words, even if the compressor's operating frequency is increased to the target frequency, the compressor's operating frequency will not exceed the maximum operating frequency at the current ambient temperature T4. Here, the maximum operating frequency at the current ambient temperature T4 can be set and determined at the factory. In this way, it can prevent the compressor from operating at too high a frequency, causing it to overload and resulting in compressor damage or abnormal cooling or heating temperatures of the air conditioner.

[0055] In some embodiments, the preset superheat value = ΔT0 + C1, where ΔT0 is the oil temperature superheat threshold that meets reliability requirements, and C1 is the oil temperature compensation correction value. Because the temperature sensor used for temperature detection may have accuracy issues or installation position deviations, the detected value may deviate from the true value. Therefore, an oil temperature compensation correction value is set to improve the preset superheat value used as a reference. Furthermore, increasing the oil temperature compensation correction value increases the margin of the judgment logic design in this embodiment. Thus, by setting an oil temperature compensation correction value in the preset superheat value, it is possible to more accurately determine whether the compressor's oil temperature superheat meets reliability requirements, reducing errors and providing a reference for more accurate control of the compressor's oil temperature superheat, ensuring reliable compressor operation. Optionally, the value range of C1 is: C1 ≥ 0, and C1 is a multiple of 0.5. For example, the value of C1 can be 1, 2, 3, 4, or 5. Of course, the value of C1 can be determined based on installation position deviations or empirical values.

[0056] Further, the ΔT0 is determined according to the outdoor ambient temperature T4, and there is a positive correlation between ΔT0 and T4. That is to say, the oil temperature superheat threshold ΔT0 that meets the reliability requirements is variable, and this value changes with the change of the outdoor ambient temperature. When the outdoor ambient temperature increases, ΔT0 also increases; when the outdoor ambient temperature decreases, ΔT0 also decreases. It should be noted that here, ΔT0 and T4 can be linearly correlated or non-linearly correlated. Preferably, ΔT0 and T4 are non-linearly correlated. In this way, it can be avoided that ΔT0 changes when the outdoor ambient temperature changes slightly, making the value of ΔT0 extremely unstable and increasing the complexity and difficulty of the judgment process of the oil temperature superheat state.

[0057] Still further, the determination of the ΔT0 according to the outdoor ambient temperature T4 includes: if T4≥7°C, then ΔT0 = 5°C; if 2°C < T4 < 7°C, then ΔT0 = 3°C; if T4≤2°C, then ΔT0 = 0°C.

[0058] According to some embodiments of the present invention, the adjustment of the operating frequency of the compressor according to the oil temperature superheat further includes: if the oil temperature superheat is not less than the preset superheat value, controlling the compressor to continue to operate at the current frequency. Specifically, when the oil temperature superheat is not less than the preset superheat value, it means that at this time, the temperature difference between the oil temperature in the compressor oil sump and the liquid storage tank temperature is relatively large, the amount of refrigerant dissolved in the lubricating oil in the compressor is relatively small, the lubricating oil is not diluted, and the lubrication and sealing performance are relatively good. Therefore, the compressor can be controlled to continue to operate at the current frequency to avoid energy waste caused by increasing the working frequency.

[0059] Optionally, when the oil temperature superheat is greater than the preset superheat value and the difference between the oil temperature superheat value and the preset superheat value is relatively large, the operating frequency of the compressor can be controlled to decrease, thereby reducing the working load, which is beneficial to extending the working life and operation reliability of the compressor.

[0060] In some embodiments, before obtaining the oil temperature superheat of the compressor in the current operating mode, the following steps are further included: determining that the operating time of the compressor is not less than the preset operating time.

[0061] Specifically, after obtaining the current operating mode of the air conditioner, it can be first judged whether the compressor is in the on state. If it is determined that the compressor has been turned on and after running for the preset operating time t1 minutes, it can be considered that the air conditioner system tends to operate stably, and then the oil temperature superheat of the compressor in the current operating mode is obtained. In this way, the obtained oil temperature superheat can be more accurate. Optionally, the value range of t1 is t1≥3. For example, the value of t1 can be 3, 4 or 5, and t1 can be reasonably selected according to the model of the compressor.

[0062] According to some embodiments of the present invention, reference Figure 1 The compressor is an integrated compressor, which may include a compressor body and a liquid receiver. The compressor body has an oil sump at its lower part, and the liquid receiver is located on the bottom surface of the compressor body and connected to the compressor body. For example, the liquid receiver and the compressor body can be integrally formed. The compressor body has an exhaust port for discharging refrigerant, and the liquid receiver has a return port.

[0063] Optionally, since the oil sump of the compressor is at a higher temperature and the liquid receiver is at a lower temperature, in order to avoid a large amount of heat exchange between the compressor oil sump and the liquid receiver, a heat insulation cavity is provided between the compressor oil sump and the liquid receiver. The heat insulation cavity can reduce the heat exchange between the compressor oil sump and the liquid receiver and prevent the oil temperature from dropping rapidly.

[0064] In some embodiments, reference Figure 2 and Figure 3 The step of obtaining the oil superheat of the compressor under the current operating mode includes: if the current operating mode of the air conditioner is cooling mode or dehumidification mode, calculating the oil superheat according to the following formula: ΔT = Toil - T3; if the current operating mode of the air conditioner is heating mode, calculating the oil superheat according to the following formula: ΔT = Toil - T2. Wherein, ΔT is the oil superheat, Toil is the oil sump temperature of the compressor, T3 is the coil temperature of the outdoor heat exchanger, and T2 is the coil temperature of the indoor heat exchanger.

[0065] In other words, the actual calculation process for oil superheat is the compressor oil sump temperature minus the condenser coil temperature. Since the outdoor heat exchanger typically acts as the condenser when the air conditioner is in cooling or dehumidification mode, and the indoor heat exchanger typically acts as the condenser when it's in heating mode, calculating the oil superheat based on the air conditioner's operating mode results in a more accurate calculation.

[0066] According to some embodiments of the present invention, reference Figure 2 and Figure 3 The control method further includes: when the compressor is running at the target frequency, acquiring the compressor's oil superheat every t2 minutes until the detected oil superheat is not less than the preset superheat, indicating that the oil superheat has returned to the normal range. At this point, the compressor's operating frequency can be reduced to decrease energy consumption. Optionally, the value of t2 can be ≥ 3; for example, t2 can be 3, 4, or 5, and t2 can be reasonably selected according to the compressor model.

[0067] The following is for reference. Figures 4-7 The control device 6 of an air conditioner 100 according to a second aspect embodiment of the present invention is described.

[0068] refer to Figure 5 According to an embodiment of the present invention, the control device 6 of the air conditioner 100 includes: a first acquisition module 61, a second acquisition module 62 and a control module 63.

[0069] The first acquisition module 61 can be used to acquire the current operating mode of the air conditioner 100, the second acquisition module 62 can be used to acquire the oil temperature superheat of the compressor 1 under the current operating mode, the control module 63 communicates with the first acquisition module 61 and the second acquisition module 62 respectively, and the control module 63 is adapted to adjust the operating frequency of the compressor 1 according to the oil temperature superheat.

[0070] According to the embodiment of the present invention, the control device 6 of the air conditioner 100 can better control the operating frequency of the compressor 1, reduce the dilution of lubricating oil by refrigerant, and improve the reliability and service life of the compressor 1.

[0071] Further, refer to Figure 6 The second acquisition module 62 may include an acquisition unit 621 and a calculation unit 622.

[0072] The acquisition unit 621 is used to acquire the oil sump temperature T3 of the compressor 1, the outdoor ambient temperature T4, and the coil temperature. Here, the coil temperature refers to the coil temperature of the heat exchanger that acts as the condenser. For example, when the air conditioner 100 is in heating mode, the outdoor heat exchanger 2 acts as the condenser, and the acquisition unit 621 acquires the coil temperature T3 of the outdoor heat exchanger 2. When the air conditioner 100 is in cooling mode or dehumidification mode, the indoor heat exchanger 5 acts as the condenser, and the acquisition unit 621 acquires the coil temperature T2 of the indoor heat exchanger 5.

[0073] Optionally, the acquisition unit 621 may include a first sub-acquisition unit 621, a second sub-acquisition unit 621, a third sub-acquisition unit 621, and a fourth sub-acquisition unit 621. The first sub-acquisition unit 621 is located on the outer wall of the compressor body 11 at a position corresponding to the oil sump to acquire the oil sump temperature T1. The second sub-acquisition unit 621 is located on the outdoor heat exchanger 2 to acquire the coil temperature T3 of the outdoor heat exchanger 2. The third sub-acquisition unit 621 is located on the indoor heat exchanger 5 to acquire the coil temperature T2 of the indoor heat exchanger 5. The fourth sub-acquisition unit 621 is used to acquire the outdoor temperature T4.

[0074] The calculation unit 622 can calculate and obtain the oil temperature superheat of compressor 1 under the current operating mode based on the data collected by the acquisition unit 621. For example, if the current operating mode of air conditioner 100 is cooling mode or dehumidification mode, the calculation unit 622 calculates the oil temperature superheat according to the following formula: ΔT = Toil - T3; if the current operating mode of air conditioner 100 is heating mode, the calculation unit 622 calculates the oil temperature superheat according to the following formula: ΔT = Toil - T2. Wherein, ΔT is the oil temperature superheat, Toil is the oil sump temperature of compressor 1, T3 is the coil temperature of outdoor heat exchanger 2, and T2 is the coil temperature of indoor heat exchanger 5.

[0075] Optionally, refer to Figure 7 The control module 63 may include a comparison unit 631 and a control unit 632. The comparison unit 631 communicates with the control unit 632 and the calculation unit 622 of the second acquisition module 62. After the calculation unit 622 of the second acquisition module 62 transmits the oil temperature superheat of the compressor 1 to the comparison unit 631, the comparison unit 631 compares the received oil temperature superheat with a preset superheat value. If the oil temperature superheat is less than the preset superheat value, the control unit 632 controls the compressor 1 to increase to the target frequency. If the oil temperature superheat is not less than the preset superheat value, the control unit 632 controls the compressor 1 to continue to operate at the current operating frequency.

[0076] The following is for reference. Figures 4-7 An air conditioner 100 according to an embodiment of a third aspect of the present invention is described.

[0077] An air conditioner 100 according to an embodiment of the present invention includes the control device 6 described in the above embodiment.

[0078] According to the embodiment of the present invention, the air conditioner 100, by employing the control device 6 in the above embodiment, can better control the operating frequency of the compressor 1, avoid the lubricating oil in the compressor 1 being dissolved and diluted by the refrigerant, improve the operating reliability of the compressor 1, and thus improve the reliability of the air conditioner 100 system.

[0079] Further, refer to Figure 4 The air conditioner 100 can be a cooling and heating air conditioner 100. The air conditioner 100 includes: an outdoor heat exchanger 2, a throttling device 3, an indoor heat exchanger 5, a control valve, and a compressor 1. Among them, the control valve is a four-way valve 4. The outdoor heat exchanger 2, the throttling device 3, and the indoor heat exchanger 5 are connected in series. The end of the outdoor heat exchanger 2 away from the throttling device 3 is connected to one port of the control valve, and the end of the indoor heat exchanger 5 away from the throttling device 3 is connected to the other port of the control valve. The exhaust port 111 and the return port 121 of the compressor 1 are respectively connected to the other two ports of the control valve.

[0080] Compressor 1 can be an integrated compressor. Compressor 1 may include a compressor body 11 and a liquid receiver 12. The compressor body 11 has an oil sump at its lower part, and the liquid receiver 12 is located on the bottom surface of the compressor body 11 and connected to the compressor body 11. For example, the liquid receiver 12 and the compressor body 11 can be integrally formed. The compressor body 11 is provided with an exhaust port 111 for discharging refrigerant, and the liquid receiver 12 has a return port 121. The liquid receiver 12 and the oil sump are connected by a pipeline to facilitate the return of lubricating oil and refrigerant from the liquid receiver 12 back into the compressor body 11. Since the oil sump temperature of compressor 1 is high, while the temperature of liquid receiver 12 is low, a heat insulation cavity 13 is provided between the oil sump and the liquid receiver 12 to avoid excessive heat exchange between them. The heat insulation cavity 13 can reduce heat exchange between the oil sump and the liquid receiver 12, preventing a rapid drop in oil temperature.

[0081] The following is for reference. Figure 8 An air conditioner 100 according to an embodiment of a fourth aspect of the present invention is described.

[0082] Specifically, the air conditioner 100 includes a memory 7, a processor 8, and a control program for the air conditioner 100 stored in the memory 7 and executable on the processor 8. When the processor 8 executes the control program for the air conditioner 100, it implements the control method of the air conditioner 100 in the above embodiments.

[0083] It should be noted that processor 8 can be an integrated circuit chip with signal processing capabilities. The aforementioned processor 8 can be a general-purpose processor, including a central processing unit (CPU), or it can be a microcontroller, microcontroller unit (MCU), complex programmable logic device (CPLD), field-programmable gate array (FPGA), application-specific integrated circuit (ASIC), embedded ARM, etc. Processor 8 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention.

[0084] The memory 7 is used to store program instructions that can be executed by the processor. For example, the control device 6 of the air conditioner 100 provided in this application embodiment includes at least one program instruction that can be stored in the memory 7 in the form of software or firmware. The memory 7 can be an independent external memory, including but not limited to Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), and Electrically Erasable Programmable Read-Only Memory (EEPROM). The memory 7 can also be integrated with the processor 8, for example, the memory 7 can be integrated with the processor 8 in the same chip.

[0085] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0087] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for an air conditioner, characterized in that, It includes the following steps: Obtain the current operating mode of the air conditioner; Obtain the oil temperature superheat degree of the compressor under the current operating mode; Adjust the operating frequency of the compressor according to the oil temperature superheat degree. If the oil temperature superheat degree is less than the preset superheat degree value, control the compressor to operate at the target frequency, and the target frequency is determined according to the current operating frequency of the compressor and the oil temperature superheat degree; Wherein, the preset superheat degree value = ΔT0 + C1, ΔT0 is the oil temperature superheat degree threshold that meets the reliability requirements, C1 is the oil temperature compensation correction value, determine ΔT0 according to the outdoor ambient temperature T4, and ΔT0 has a positive correlation with T4.

2. The control method for an air conditioner according to claim 1, characterized in that, The target frequency satisfies: F(Toil) = [ΔT] F1 / 10]+C2, where F(Toil) is the target frequency, ΔT is the oil temperature superheat, F1 is the current operating frequency of the compressor, and C2 is the frequency compensation correction value.

3. The control method for an air conditioner according to claim 1, characterized in that, The target frequency satisfies: F(Toil) ≤ F2, where F(Toil) is the target frequency and F2 is the maximum operating frequency of the compressor under the current ambient temperature T4.

4. The control method for an air conditioner according to claim 1, characterized in that, The determining of ΔT0 according to the outdoor ambient temperature T4 includes: If T4 ≥ 7°C, then ΔT0 = 5°C; If 2°C < T4 < 7°C, then ΔT0 = 3°C; If T4 ≤ 2°C, then ΔT0 = 0°C.

5. The control method for an air conditioner according to claim 1, characterized in that, The adjusting of the operating frequency of the compressor according to the oil temperature superheat degree further includes: If the oil temperature superheat degree is not less than the preset superheat degree value, control the compressor to continue operating at the current frequency.

6. The control method for an air conditioner according to claim 1, characterized in that, Before obtaining the oil temperature superheat degree of the compressor under the current operating mode, the following steps are further included: Determine that the operating time of the compressor is not less than the preset operating time.

7. The control method for an air conditioner according to claim 1, characterized in that, The compressor includes: A compressor body, and an oil sump is provided at the lower part of the compressor body; A liquid storage tank, which is arranged on the bottom surface of the compressor body and is connected to the compressor body.

8. The control method for an air conditioner according to any one of claims 1-7, characterized in that, The obtaining of the oil temperature superheat degree of the compressor under the current operating mode includes: If the current operating mode of the air conditioner is the refrigeration mode or the dehumidification mode, calculate the oil temperature superheat degree according to the following formula: ΔT = Toil - T3; If the current operating mode of the air conditioner is the heating mode, calculate the oil temperature superheat degree according to the following formula: ΔT = Toil - T2; Wherein, ΔT is the oil temperature superheat degree, Toil is the oil sump temperature of the compressor, T3 is the coil temperature of the outdoor heat exchanger, and T2 is the coil temperature of the indoor heat exchanger.

9. A control device for an air conditioner, characterized in that... It includes: A first obtaining module, which is used to obtain the current operating mode of the air conditioner; A second obtaining module, which is used to obtain the oil temperature superheat degree of the compressor under the current operating mode; A control module, which is used to adjust the operating frequency of the compressor according to the oil temperature superheat degree. The control module is used to control the compressor to operate at the target frequency when the oil temperature superheat degree is less than the preset superheat degree value, and the target frequency is determined according to the current operating frequency of the compressor and the oil temperature superheat degree; Wherein, the preset superheat degree value = ΔT0 + C1, ΔT0 is the oil temperature superheat degree threshold that meets the reliability requirements, C1 is the oil temperature compensation correction value, determine ΔT0 according to the outdoor ambient temperature T4, and ΔT0 has a positive correlation with T4.

10. The control device for an air conditioner according to claim 9, characterized in that, The second acquisition module includes a data acquisition unit and a calculation unit. The data acquisition unit is used to acquire the oil sump temperature, outdoor ambient temperature, and coil temperature of the compressor. The calculation unit calculates and acquires the oil temperature superheat of the compressor under the current operating mode based on the data acquired by the data acquisition unit.

11. An air conditioner, characterized in that, include: The control device according to claim 9 or 10.

12. The air conditioner according to claim 11, characterized in that, The compressor includes: a compressor body, the lower part of which has an oil sump; and a liquid storage tank, which is located on the bottom surface of the compressor body and connected to the compressor body.

13. An air conditioner, characterized in that, The device includes a memory, a processor, and a control program for an air conditioner stored in the memory and executable on the processor. When the processor executes the control program for the air conditioner, it implements the control method for the air conditioner according to any one of claims 1-8.

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