Compressor return pipe de-icing control method and air conditioner

Abstract

The present invention discloses an ice melting control method for a compressor return air pipe and an air conditioner, comprising the following steps: starting the air conditioner, a calculator M=0; judging the working mode of the air conditioner; starting the compressor, the internal fan and the external fan in a set order; when the running time N of the compressor is greater than the first set time N1, starting to monitor the internal disk temperature IPT; within the set continuous time t1, when the monitored internal disk temperature IPT is less than the first set temperature T1, the calculator M adds 1 on the original basis; when the running time N of the compressor is greater than the second set time N2, judging whether the value of the calculator M is greater than the first set count M1; controlling the compressor to shut down and then restart. According to the running state of the air conditioner, corresponding control instructions can be performed so as to melt the ice on the return air pipe in a timely and effective manner, and the return air pipe is not likely to vibrate and collide with other hard objects due to ice on the return air pipe, so as to reduce pipeline noise.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioners, and in particular to an ice melting control method for a compressor return air pipe and an air conditioner. Background Art

[0002] Air conditioners are commonly used household appliances. An important indicator for evaluating air conditioners is the noise level. The main factor of outdoor unit noise is pipeline vibration. Since the compressor generates abnormal noise during operation, the noise will be transmitted to the room through the pipeline, which will affect the user experience. The existing measure is to add shockproof glue to the compressor pipeline to control the pipeline vibration at a low level, but the use effect is not good. This is due to the different environments in which the air conditioner is used. When the temperature of the compressor return pipe is as low as 0℃, the water vapor in the air will condense on the return pipe and adhere to the return pipe. If the condensed water on the return pipe is not discharged in time, it will condense into ice when the return air temperature is lower than 0℃. This causes the vibration of the return pipe to change. Since the gap between the return pipe and other sheet metal is only 15-30mm, the return pipe after freezing is driven by the compressor and easily collides with other hard objects, causing abnormal noise. In severe cases, the pipeline will be broken by vibration, which will cause damage to the outdoor unit and affect the service life of the air conditioner.

[0003] Therefore, the purpose of the present application is to provide an ice melting control method for a compressor return air pipe and an air conditioner to solve at least one of the above problems. Summary of the invention

[0004] In view of the above analysis, the present invention proposes a compressor return pipe ice melting control method and air conditioner to solve the deficiencies of the prior art.

[0005] The present invention is mainly achieved through the following technical solutions:

[0006] The present invention provides a method for controlling ice melting of a compressor return pipe, comprising the following steps:

[0007] S1: Start the air conditioner, and the counter starts counting M=0;

[0008] S2: Get the mode control instruction of the air conditioner. If it is cooling mode, go to step S3; if not, go to step S9:

[0009] S3: Start the compressor, internal fan and external fan in the set order;

[0010] S4: Obtain the cumulative running time N of the compressor. When the running time N of the compressor is greater than the first set time N1, start monitoring the inner disk temperature IPT;

[0011] S5: within the set continuous time t1, determine whether the monitored inner disk temperature IPT is less than the first set temperature T1, if so, proceed to step S6;

[0012] S6: Get the count of the calculator, and add 1 to the original count of the calculator;

[0013] S7: When the compressor operation time N is greater than the second set time N2, determine whether the value of the counter M is greater than the first set count M. 1 If yes, go to step S8, if no, continue to monitor the inner disk temperature IPT until the value of M is greater than the first set count M 1 ;

[0014] S8: Control the compressor to shut down and then restart, and return to step S4;

[0015] S9: Determine whether the air conditioner is in heating mode, if yes, go to step S10; if no, return to step S2;

[0016] S10: Start the compressor, four-way valve, external fan and internal fan in the set order;

[0017] S11: When the compressor operation time N is greater than the first set time N3, the inner disk temperature IPT is obtained, and the currently monitored inner disk temperature IPTn is set as the maximum inner disk temperature IPTmax at the current moment;

[0018] S12: Compare the inner disk temperature IPTn+1 at the next acquisition moment with the current IPTmax. When IPTn+1>IPTmax, set the inner disk temperature IPTn+1 at the next acquisition moment as the maximum inner disk temperature IPTmax at the next moment. Otherwise, keep the maximum inner disk temperature IPTmax at the current moment unchanged.

[0019] S13: When the compressor operation time N is greater than the fourth set time N4, proceed to step S14, otherwise return to step S12;

[0020] S14: within the set continuous time t2, when the monitored inner disk temperature IPTn is less than the third set temperature T3, proceed to step S15, otherwise, proceed to step S17;

[0021] S15: When the difference between the current maximum inner disk temperature IPTmax and the inner disk temperature IPTn collected at this time is greater than the fourth set temperature T4, proceed to step S16, otherwise return to step S12;

[0022] S16: Control the compressor, the four-way valve and the external fan to shut down and restart in a set sequence, and return to step S11;

[0023] S17: Determine whether the wind speed mode of the internal fan is the low speed mode, if so, proceed to step S18, otherwise return to step S12;

[0024] S18: Determine whether the difference between the current maximum inner disk temperature IPTmax and the inner disk temperature IPTn collected at this time is greater than the fifth set temperature T5. If so, proceed to step S16, otherwise return to step S12.

[0025] Furthermore, in step S3, starting the compressor, the indoor fan and the outdoor fan in a set order includes the following:

[0026] Start the inner fan first, then the compressor, and finally the outer fan.

[0027] Furthermore, in step S8, controlling the compressor to shut down and then restart, and returning to step S4 includes the following steps:

[0028] S8.1: Turn off the compressor and restart it after the set time t3;

[0029] S8.2: Reset the compressor running time N and the counter M to zero, and return to step S4.

[0030] Furthermore, in step S10, starting the compressor, the four-way valve, the external fan and the internal fan in a set order includes the following steps:

[0031] S10.1: Start the four-way valve, compressor and external fan;

[0032] S10.2: Obtain the inner plate temperature IPT. When the inner plate temperature IPT is greater than the second set temperature T2;

[0033] S10.3: Start the internal fan.

[0034] Furthermore, the control of the compressor, the four-way valve and the external fan in step S16 to shut down and restart according to the set sequence and return to step S11 includes the following:

[0035] S16.1: Turn off the compressor and close the four-way valve after the set time t4, and then turn off the external fan and the internal fan;

[0036] S16.2: restart the compressor after the set time t5, restart the external fan after the set time t6, restart the four-way valve after the set time t7, and finally start the internal fan after the set time t8;

[0037] S16.3: Reset the compressor operation time N and IPTmax to zero, and return to step S11.

[0038] Furthermore, the M 1 =0.

[0039] The present invention also provides an air conditioner, comprising a controller, wherein the controller is used to execute control instructions to implement the de-icing control method for the compressor return air pipe.

[0040] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows:

[0041] The present invention provides an ice-melting control method for a compressor return air pipe and an air conditioner, which can perform corresponding control instructions according to the operating state of the air conditioner. In the cooling mode, after the judgment condition is met, the compressor is turned off and restarted so that the external environment temperature can melt the ice on the return air pipe in time and effectively. In the heating mode, after the judgment condition is met, the cooling mode is switched and the components of the air conditioner are restarted, and the high temperature of the refrigerant is used to melt the ice on the condenser in time and effectively. At the same time, the high temperature of the compressor housing and the outdoor unit heat exchanger is used to melt the ice on the return air pipe in time and effectively. It is not easy for the return air pipe to vibrate and collide with other hard objects due to ice on the return air pipe, so as to reduce the pipeline noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a flow chart of a method for controlling ice melting of a compressor return air pipe provided by an embodiment of the present invention;

[0044] Figure 2 is a flowchart of step S8 provided in an embodiment of the present invention;

[0045] Figure 3 is a flowchart of step S10 provided in an embodiment of the present invention;

[0046] Figure 4 is a flowchart of step S16 provided in an embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of the principle of an air conditioner provided by an embodiment of the present invention in a cooling mode;

[0048] Figure 6 is a schematic diagram of the principle of an air conditioner provided by an embodiment of the present invention in a heating mode;

[0049] Figure 7 It is a piping schematic diagram of a compressor of an outdoor unit provided in an embodiment of the present invention.

[0050] The reference numerals are as follows:

[0051] 1. Compressor, 2. Indoor unit, 3. Outdoor unit, 4. Throttling element, 5. Four-way valve, 6. High-pressure valve, 7. Low-pressure valve, 8. Inner coil, 9. Exhaust pipe, 10. Return air pipe, 11. Chassis, 12. Middle partition, 13. Access pipe, 14. Outdoor heat exchanger. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of the present invention, the present invention is described in detail with respect to some specific embodiments of the present invention. It should be noted that the following are only some specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structure is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selection and replacement made by those skilled in the art under the guidance of the present invention should be regarded as within the scope of the present invention.

[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0054] Example 1

[0055] like Figure 1 As shown, the present invention provides a method for controlling ice melting of a compressor return air pipe, comprising the following steps:

[0056] S1: Turn on the air conditioner, and the calculator starts counting M=0;

[0057] S2: Get the mode control instruction of the air conditioner. If it is cooling mode, go to step S3; if not, go to step S9:

[0058] S3: Start the compressor 1, the internal fan and the external fan in a set order; specifically, start the internal fan first, then start the compressor 1, and finally start the external fan; at this time, the running time N of the compressor 1 = 0;

[0059] S4: Get the cumulative running time N of compressor 1. When the running time N of compressor 1 is greater than the first set time N1, start real-time monitoring of the inner disk temperature IPT; wherein N1 is 6 minutes; the inner disk temperature IPT monitored after 6 minutes can provide an accurate reference to ensure the detection effect, reduce detection errors, and make the detection more efficient.

[0060] S5: Within the set continuous time t1, when the monitored inner disk temperature IPT is less than the first set temperature T1, if so, enter step S6; wherein t1 is 5min, T1 is 6°C; through the above judgment conditions, determine whether the return air pipe of the compressor has been frosted and perform subsequent operations.

[0061] S6: Obtain the count of the calculator and add 1 to the original count of the calculator; this indicates that the air conditioner meets the above judgment conditions. After adding 1, the counter M must be greater than 0, and it is necessary to perform judgment through step S7 and perform subsequent ice melting operations.

[0062] S7: When the running time N of the compressor 1 is greater than the second set time N2, it is determined whether the value of the counter M is greater than the first set count M. 1 If yes, go to step S8, if no, continue to monitor the inner disk temperature IPT until the value of M is greater than the first set count M 1 ; Among them, N2 is 120min, M 1 0; Due to external vibration, the return air pipe is less affected by vibration when there is a small amount of frost. Even if it is determined that the return air pipe is frosted, there is no need to defrost. In the cooling mode, only when the compressor running time accumulates to 120 minutes and M>0, it is determined that the frost has reached a certain degree and defrost operation is required to avoid affecting the normal cooling effect.

[0063] S8: Control the compressor 1 to shut down and then restart, and return to step S4.

[0064] like Figure 2 As shown, step S8 includes the following steps:

[0065] S8.1: shut down compressor 1 and restart compressor 1 after a set time t3; wherein t3 is 3 minutes;

[0066] S8.2: Reset the running time N of the compressor 1 and the counter M to zero, and return to step S4.

[0067] Since only the return air pipe of the compressor may freeze when cooling is performed under high external temperature, it is only necessary to shut down the compressor for a period of time and use the external ambient temperature to melt the ice on the return air pipe. There is no need to adjust the startup status of other components of the air conditioner.

[0068] S9: Determine whether the air conditioner is in heating mode, if yes, go to step S10; if no, return to step S2;

[0069] S10: Start the compressor 1, the four-way valve 5, the external fan and the internal fan according to the set sequence;

[0070] Specifically, Figure 3 As shown, step S10 includes the following:

[0071] S10.1: Start four-way valve 5, compressor 1, and external fan;

[0072] S10.2: Real-time monitoring of the inner plate temperature IPT, when the inner plate temperature IPT is greater than a second set temperature T2, wherein T2 = 37°C;

[0073] S10.3: Start the internal fan.

[0074] When starting, the wind speed of the internal fan is determined according to the control command of the remote control. When the internal disk temperature IPT is lower than 37℃, no heat is generated temporarily, and the wind blown out by the internal fan will be relatively cold, which makes people feel uncomfortable. Therefore, it is necessary to wait until a certain temperature is reached before turning on the internal fan.

[0075] S11: When the running time N of compressor 1 is greater than the first set time N3, the inner disk temperature IPT is obtained in real time, and the currently collected inner disk temperature IPTn is set as the maximum inner disk temperature IPTmax at the current moment; wherein, N3=6min; the inner disk temperature IPT monitored after 6min can provide an accurate reference to ensure the detection effect, reduce detection errors, and make the detection more efficient.

[0076] S12: Compare the inner disk temperature IPTn+1 at the next acquisition moment with the current IPTmax. When IPTn+1>IPTmax, set the inner disk temperature IPTn+1 at the next acquisition moment as the maximum inner disk temperature IPTmax at the next moment, otherwise keep the maximum inner disk temperature IPTmax at the current moment unchanged; ensure the reliability of the maximum inner disk temperature IPTmax and ensure that subsequent judgment conditions are more accurate.

[0077] S13: When the running time N of the compressor 1 is greater than the fourth set time N4, the process proceeds to step S14, otherwise the process returns to step S12; wherein N4=60 min;

[0078] S14: within the set continuous time t2, when the monitored inner plate temperature IPTn is less than the third set temperature T3, proceed to step S15, otherwise, proceed to step S17; wherein t2 = 3 min, T3 = 40°C;

[0079] S15: When the difference between the current maximum temperature of the inner disk IPTmax and the collected inner disk temperature IPTn is greater than the fourth set temperature T4, proceed to step S16, otherwise return to step S12; wherein T4 = 8°C;

[0080] Due to external vibration, the return air pipe is less affected by vibration when there is a small amount of frost. Even if it is determined that the return air pipe is frosted, there is no need to perform defrosting operation. In heating mode, only when the compressor running time accumulates to 60 minutes and the inner disk temperature IPTn is <40℃ for 3 consecutive minutes, and the judgment conditions of step S15 are met, it is determined that the frost has reached a certain degree, and defrosting operation is required to avoid affecting the normal heating effect.

[0081] S16: Control the compressor 1, the four-way valve 5 and the external fan to shut down and restart in a set sequence, and return to step S11;

[0082] Specifically, Figure 4 As shown, step S16 includes the following:

[0083] S16.1: Turn off the compressor 1 and close the four-way valve 5 after the set time t4, and then turn off the external fan and the internal fan; wherein t4 = 30s;

[0084] S16.2: restart the compressor 1 after the set time t5, restart the external fan after the set time t6, restart the four-way valve 5 after the set time t7, and finally start the internal fan after the set time t8; wherein t5 = 15s, t6 = 8min, t7 = 20s, t8 = 5s;

[0085] S16.3: Clear the running time N and IPTmax of compressor 1, and return to step S11.

[0086] S17: Determine whether the wind speed mode of the internal fan is the low speed mode, if so, proceed to step S18, otherwise return to step S12;

[0087] S18: Determine whether the difference between the current maximum inner disk temperature IPTmax and the inner disk temperature IPTn collected at this time is greater than the fifth set temperature T5. If so, proceed to step S16, otherwise return to step S12; wherein T5 = 5°C.

[0088] When heating is performed under low external environment conditions, not only the return air pipe of the compressor will freeze, but the condenser will also freeze. Therefore, it is necessary to turn off the compressor, outdoor fan, indoor fan, and close the four-way valve, switch the air conditioner to cooling mode to melt the ice on the condenser, and use the high temperature of the outdoor unit heat exchanger and compressor casing to melt the ice on the return air pipe, and then restart the components of the air conditioner.

[0089] The above setting parameters (including time and temperature) are the most suitable settings and can be adjusted appropriately as needed.

[0090] The present invention also provides an air conditioner, further comprising a controller, wherein the controller is used to execute control instructions to implement the above-mentioned de-icing control method for the compressor return air pipe.

[0091] like Figure 5-6As shown, the air conditioner provided by the present invention includes a compressor 1, an indoor unit 2, an outdoor unit 3, a throttling element 4, a four-way valve 5, a high-pressure valve 6, and a low-pressure valve 7. The exhaust pipe 9 of the compressor 1, the return air pipe 10 of the compressor, the indoor unit 2, and the outdoor unit 3 are respectively connected to the ports of the four-way valve 5. The indoor unit 2 and the outdoor unit 3 are connected in series through the high-pressure valve 6 and the throttling element 4 in turn. A low-pressure valve 7 is provided between the indoor unit 2 and the corresponding ports of the four-way valve 5. The indoor unit 2 includes an indoor heat exchanger, an inner coil 8 and an inner fan, and the throttling element 4 is a capillary tube.

[0092] like Figure 7 As shown, the outdoor unit 3 includes an outdoor fan, a chassis 11, a middle partition 12 and an outdoor heat exchanger 14. The middle partition 12, the outdoor heat exchanger 14 and the compressor 1 are all installed on the chassis 11, and the four-way valve 5 is connected to the outdoor heat exchanger 14 through an access pipe 13.

[0093] like Figure 5 As shown, when the air conditioner is in cooling mode, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant from the exhaust pipe 9. At this time, the temperature of the exhaust pipe 9 is higher than 60°C and will not freeze under various environments. The high-temperature and high-pressure gaseous refrigerant passes through the four-way valve 5 and reaches the outdoor unit 3 for heat release and condensation. The liquid refrigerant after passing through the outdoor unit 3 is throttled by the throttling element 4 and becomes a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant absorbs heat and evaporates through the indoor unit 2. The evaporation temperature varies according to the temperature of the refrigerant entering the indoor unit 2, the room temperature and the different states of the indoor fan. The evaporation temperature has a wide range of variation and can also reach a very low temperature. When the evaporation temperature is low, the evaporated refrigerant is affected by the resistance of the pipeline along the layer when passing through the connecting pipe and the flash of the mixed refrigerant. The refrigerant temperature will become lower and lower. When it reaches the return air pipe 10, it may reach below 0°C, which will cause freezing. Therefore, in the cooling mode, the evaporation temperature can be indirectly known mainly by monitoring the internal disk temperature and the accumulated time of the compressor, so as to adjust the start-up state of the compressor 1 in time to melt the ice on the return air pipe 10.

[0094] like Figure 6As shown, when the air conditioner is in heating mode, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant from the exhaust pipe 9. At this time, the temperature of the exhaust pipe 9 is relatively high and greater than 40°C, and it will not freeze in various environments. The high-temperature and high-pressure gaseous refrigerant passes through the four-way valve 5 and reaches the indoor unit 2 for heat release and condensation. The liquid refrigerant after passing through the indoor unit 2 is throttled by the throttling element 4 and becomes a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant absorbs heat and evaporates through the outdoor unit 3. Due to the low external environment temperature and the low evaporation temperature, the temperature of the refrigerant after evaporation from the outdoor unit 3 to the return air pipe 10 of the compressor 1 is often relatively low, generally between -1°C and 2°C. When the external environment is relatively low, below 3°C, the return air pipe 10 and the evaporation temperature will be as low as below 0°C. At this time, if the air conditioner is running for a long time, the return air pipe 10 will freeze and the internal disk temperature IPT will also decay.

[0095] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for controlling ice melting of a compressor return pipe, characterized in that: The steps include: S1: Start the air conditioner, and the counter starts counting M=0; S2: Get the mode control instruction of the air conditioner. If it is cooling mode, go to step S3; if not, go to step S9: S3: Start the compressor (1), the internal fan and the external fan in a set order; S4: obtaining the cumulative running time N of the compressor (1), and when the running time N of the compressor (1) is greater than the first set time N1, starting to monitor the inner disk temperature IPT; S5: within the set continuous time t1, determine whether the monitored inner disk temperature IPT is less than the first set temperature T1, if so, proceed to step S6; S6: Get the count of the calculator, and add 1 to the original count of the calculator; S7: when the running time N of the compressor (1) is greater than the second set time N2, it is determined whether the value of the counter M is greater than the first set count M1. If so, the process proceeds to step S8. If not, the process continues to monitor the inner disk temperature IPT until the value of M is greater than the first set count M1. S8: Control the compressor (1) to shut down and then restart, and return to step S4; S9: Determine whether the air conditioner is in heating mode, if so, proceed to step S10; If not, return to step S2; S10: starting the compressor (1), the four-way valve (5), the external fan and the internal fan in a set sequence; S11: when the operation time N of the compressor (1) is greater than the first set time N3, the inner disk temperature IPT is obtained, and the currently monitored inner disk temperature IPTn is set as the maximum inner disk temperature IPTmax at the current moment; S12: Compare the inner disk temperature IPTn+1 at the next acquisition moment with the current IPTmax. When IPTn+1>IPTmax, set the inner disk temperature IPTn+1 at the next acquisition moment as the maximum inner disk temperature IPTmax at the next moment. Otherwise, keep the maximum inner disk temperature IPTmax at the current moment unchanged. S13: When the running time N of the compressor (1) is greater than the fourth set time N4, the process proceeds to step S14, otherwise the process returns to step S12; S14: within the set continuous time t2, when the monitored inner disk temperature IPTn is less than the third set temperature T3, proceed to step S15, otherwise, proceed to step S17; S15: When the difference between the current maximum inner disk temperature IPTmax and the inner disk temperature IPTn collected at this time is greater than the fourth set temperature T4, proceed to step S16, otherwise return to step S12; S16: Control the compressor (1), the four-way valve (5) and the external fan to shut down and restart in a set sequence, and return to step S11; S17: Determine whether the wind speed mode of the internal fan is the low speed mode, if so, proceed to step S18, otherwise return to step S12; S18: Determine whether the difference between the current maximum inner disk temperature IPTmax and the inner disk temperature IPTn collected at this time is greater than the fifth set temperature T5. If so, proceed to step S16, otherwise return to step S12.

2. The method for controlling ice melting of a compressor return pipe according to claim 1, characterized in that: The step S3 of starting the compressor (1), the internal fan and the external fan in a set order includes the following steps: Start the internal fan first, then the compressor (1), and finally the external fan.

3. The method for controlling ice melting of a compressor return pipe according to claim 1, characterized in that: Controlling the compressor (1) to shut down and then restart in step S8 and returning to step S4 comprises the following steps: S8.1: Turn off the compressor (1) and restart the compressor (1) after a set time t3; S8.2: Reset the running time N of the compressor (1) and the counter M to zero, and return to step S4.

4. The method for controlling ice melting of a compressor return pipe according to claim 1, characterized in that: The step S10 of starting the compressor (1), the four-way valve (5), the external fan and the internal fan in a set order comprises the following steps: S10.1: Start the four-way valve (5), the compressor (1) and the external fan; S10.2: Obtaining the inner disk temperature IPT, when it is detected that the inner disk temperature IPT is greater than the second set temperature T2; S10.3: Start the internal fan.

5. The method for controlling ice melting of a compressor return pipe according to claim 1, characterized in that: The step S16 of controlling the compressor (1), the four-way valve (5) and the external fan to shut down and restart in a set sequence and returning to step S11 comprises the following: S16.1: Turn off the compressor (1) and close the four-way valve (5) after the set time t4, and then turn off the external fan and the internal fan; S16.2: restart the compressor (1) after a set time t5, restart the external fan after a set time t6, restart the four-way valve (5) after a set time t7, and finally restart the internal fan after a set time t8; S16.3: Clear the running time N and IPTmax of the compressor (1) and return to step S11.

6. The method for controlling ice melting of a compressor return pipe according to claim 1, characterized in that: The M1=0.

7. An air conditioner, characterized in that: It includes a controller, which is used to execute control instructions to implement the de-icing control method for the compressor return pipe as described in any one of claims 1-6.

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