Intelligent defrosting method for air conditioner

Abstract

The invention discloses an intelligent defrosting method for an air conditioner, which is characterized by comprising the following steps: after the air conditioner enters a heating mode, detecting whether the indoor air speed, the running time of a compressor and the temperature of an indoor coil meet preset conditions for entering a defrosting mode, and if so, enabling the air conditioner to enter the defrosting mode; and under the condition that the condition that the air conditioner enters the defrosting mode is met, whether the air conditioner is made to quit defrosting or not is determined according to the preset condition for quitting the defrosting mode, and if yes, the air conditioner is made to quit the defrosting mode.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an intelligent defrosting method for air conditioners. Background Art

[0002] When the air conditioner is running for heating, the temperature exchanger of the indoor unit dissipates heat to the room, while the outdoor unit is in a low temperature environment, causing frost to form on the condenser after a certain period of operation. In order to prevent the frost layer of the outdoor unit from affecting the use of the air conditioner when the temperature is too low, the air conditioner has an automatic defrosting function. Defrosting mainly converts the flow direction of the refrigerant, and delivers the high-temperature and high-pressure refrigerant output by the compressor to the frosted heat exchanger of the outdoor unit, so that the frost layer on the outdoor unit melts. However, for cost considerations, the existing defrosting control technology of the fixed-frequency machine mostly uses the change of the temperature of the inner and indoor coils to identify the frosting of the outdoor unit, and then defrosts. Since only the change of the temperature of the inner and indoor coils is considered to infer the change of the temperature of the outdoor unit heat exchanger, there are the following deficiencies: the actual situation of the outdoor unit frosting cannot be accurately identified, the feedback time is long, and defrosting is performed when the frost layer is very thin, resulting in frequent defrosting and poor heating comfort. There is also a situation where defrosting is started only when the frost layer is very thick, resulting in incomplete defrosting, frequent defrosting, and affecting comfort. Therefore, based on the above technical problems, the present application proposes an intelligent defrosting method for an air conditioner, which determines whether to enter the defrost mode by comparing the changes in the indoor coil temperature and the indoor temperature. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and to provide an intelligent defrosting method for an air conditioner which determines whether to enter a defrosting mode by comparing the indoor coil temperature with the change in the indoor temperature.

[0004] In order to achieve the above-mentioned purpose, the present invention provides an intelligent defrosting method for an air conditioner, which is characterized by: after the air conditioner enters the heating mode, detecting whether the indoor wind speed, the compressor running time and the indoor coil temperature meet the preset conditions for entering the defrost mode, and if so, making the air conditioner enter the defrost mode; if the conditions for the air conditioner to enter the defrost mode are met, determining whether to make the air conditioner exit the defrost according to the preset conditions for exiting the defrost mode, and if so, making the air conditioner exit the defrost mode.

[0005] Furthermore, the defrost modes of the air conditioner include cold wind defrosting and conventional heating defrosting.

[0006] Furthermore, the preset conditions for the air conditioner to enter the anti-cold wind defrost mode are: after the outdoor fan operating time is greater than a first preset time, the cumulative operating time of the compressor is greater than a second preset time, the anti-cold wind temperature TP1 of the indoor coil is less than or equal to the first preset temperature.

[0007] Furthermore, the preset conditions for the air conditioner to enter conventional heating and defrosting are: the outdoor fan operating time is greater than a first preset time, the indoor wind speed is stable at a certain speed within a third preset time, and the cumulative operating time of the compressor is greater than a fourth preset time, by comparing the difference between the maximum recorded difference between the indoor coil temperature and the indoor temperature and the current difference.

[0008] Furthermore, the defrost cycle of the conventional heating defrost of the air conditioner is equal to the defrost target time, and the defrost cycle of the cold wind defrost is 0.8 times the defrost target time.

[0009] Furthermore, the preset exit condition for conventional defrosting of the air conditioner is: after the air conditioner enters the defrost mode for a time greater than the first preset exit time, the current temperature of the indoor coil is greater than the first preset exit temperature and is maintained for a second preset exit time; or, during the defrost process of the air conditioner, after recording the lowest temperature of the indoor coil, the current temperature of the indoor coil is greater than the second preset exit temperature within the second preset exit time; or, during the defrost process of the air conditioner, the current temperature of the indoor coil does not drop within a third preset exit time.

[0010] The present invention adopts the above-mentioned solution, and its beneficial effects are: It is suitable for all air conditioners with heat pump heating function. In addition, it can accurately defrost the air conditioner to avoid frequent defrosting of thin frost or too long defrosting time, ensuring that the heating process of the air conditioner system always remains efficient and comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a flow chart of an intelligent defrosting method for an air conditioner in an embodiment of the present invention.

[0012] Figure 2 The schematic diagram of the intelligent defrosting method for an air conditioner in an embodiment of the present invention is shown in FIG.

[0013] Figure 3 This is an assignment diagram of the intelligent defrosting method for an air conditioner in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0015] See attached Figure 1As shown, in an embodiment of the present invention, in order to achieve the above-mentioned purpose, an intelligent defrosting method for an air conditioner is provided by the present invention, which is characterized in that: after the air conditioner enters the heating mode, the indoor wind speed, the compressor running time and the indoor coil temperature are detected to see whether they meet the preset conditions for entering the defrost mode, and if so, the air conditioner enters the defrost mode; when the defrost conditions are met, it is determined whether to make the air conditioner exit the defrost according to the preset conditions for exiting the defrost mode, and if so, the air conditioner exits the defrost mode. By proposing a variety of preset conditions for entering the defrost mode of the air conditioner and the exit preset conditions for exiting the defrost mode, the accuracy of the air conditioner entering the defrost mode and the effectiveness of the defrost mode are guaranteed.

[0016] In an embodiment of the present invention, the defrost mode of the air conditioner includes cold wind defrost and conventional heating defrost, wherein the defrost cycle of the conventional heating defrost of the air conditioner is equal to the defrost target time Tms1, and the defrost cycle of the cold wind defrost is 0.8 times the defrost target time Tms1.

[0017] In the embodiment of the present invention, whether the air conditioner enters the defrost mode is determined according to the following conditions: The first one is that the air conditioner enters the anti-cold wind defrost mode: after the outdoor fan running time is greater than the outdoor fan continuous running time Tm1 (the first preset time), and the cumulative running time of the compressor is greater than the compressor continuous running time Tm3 (the second preset time), the anti-cold wind temperature TP1 of the indoor coil is less than or equal to the defrost judgment temperature T1 (the first preset temperature), where TP1≤9T1.

[0018] The second type is that the air conditioner enters the conventional heating and defrosting mode: the outdoor fan running time is greater than the outdoor fan continuous running time Tm1 (the first preset time), the indoor wind speed is stable at a certain speed within the third preset time, and the cumulative running time of the compressor is greater than the fourth preset time (the fourth preset time is a multiple of the compressor continuous running time Tm3). Then, the difference △T between the maximum difference T0max recorded between the indoor coil temperature Tp and the indoor temperature Tr and the current difference T0now is compared (△T=T0max-T0now).

[0019] In the embodiment of the present invention, after the air conditioner enters the defrost mode, it is determined whether the air conditioner exits the defrost mode in advance according to the following conditions.

[0020] The first one is that after the air conditioner enters the defrost mode for a time greater than the defrost process time 1- Tms2 (the first exit preset time), the current temperature of the indoor coil is greater than the defrost judgment temperature 2-T2 (the first exit preset temperature) and maintains the defrost process time 2-Tms3 (the second exit preset time).

[0021] The second type is that during the defrosting process, after recording the lowest temperature Tpmin of the indoor coil, the current temperature Tp of the indoor coil is greater than the defrosting judgment temperature 2 - T2 (the second exit preset temperature) by 1°C within the defrosting process time 1-Tms2 (the second exit preset time).

[0022] The third type is that during the defrosting process of the air conditioner, the temperature Tp of the indoor coil does not decrease within the defrosting process time 1-Tms2 (the third exit preset time).

[0023] Through the above defrost judgment scheme, the air conditioner can be defrosted accurately to avoid frequent defrosting of thin frost or too long defrosting time, etc., to ensure that the air conditioner always maintains high efficiency and comfort during the heating process.

[0024] It should be noted that those skilled in the art can adjust the above preset time and preset temperature within a suitable range according to actual application scenarios.

[0025] In addition, see Appendix Figure 2 As shown, in the embodiment of the present invention, when the air conditioner turns on the heating mode, the processor will turn on the stepper motor, the indoor motor, the outdoor motor, the four-way valve coil and the compressor to enable the electric auxiliary heating function to operate normally, and enable the indoor motor and the outdoor motor to drive the indoor fan and the outdoor fan to operate; as the heating mode is running, the air conditioner detects the indoor temperature and the coil temperature according to the indoor temperature sensor and the coil temperature sensor, and thus determines through the processor whether to enter the anti-cold wind defrosting mode or the conventional heating defrosting mode.

[0026] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, makes more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modifications are all equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent defrosting method for an air conditioner, characterized in that: After the air conditioner enters the heating mode, it detects whether the indoor wind speed, the compressor running time and the indoor coil temperature meet the preset conditions for entering the defrost mode. If so, the air conditioner enters the defrost mode. If the conditions for the air conditioner to enter the defrost mode are met, it is determined whether to make the air conditioner exit the defrost mode based on the preset conditions for exiting the defrost mode. If so, the air conditioner exits the defrost mode.

2. The intelligent defrosting method for an air conditioner according to claim 1, characterized in that: The defrost modes of the air conditioner include cold wind defrost and conventional heating defrost.

3. The intelligent defrosting method for an air conditioner according to claim 2, characterized in that: The preset condition for the air conditioner to enter the cold wind prevention defrost mode is: after the outdoor fan operating time is greater than a first preset time, the compressor cumulative operating time is greater than a second preset time, and the cold wind prevention temperature of the indoor coil is less than or equal to the first preset temperature.

4. The intelligent defrosting method for an air conditioner according to claim 2, characterized in that: The preset conditions for the air conditioner to enter conventional heating and defrosting are: the outdoor fan operating time is greater than the first preset time, the indoor wind speed is stable at a certain speed within the third preset time, and the cumulative running time of the compressor is greater than the fourth preset time, by comparing the difference between the maximum recorded difference and the current difference between the indoor coil temperature and the indoor temperature.

5. The intelligent defrosting method for an air conditioner according to claim 1, characterized in that: The defrost cycle of the conventional heating defrost of the air conditioner is equal to the defrost target time, and the defrost cycle of the cold wind defrost is 0.8 times the defrost target time.

6. The intelligent defrosting method for an air conditioner according to claim 1, characterized in that: The preset exit condition of the conventional defrosting of the air conditioner is: after the air conditioner enters the defrosting mode for a time greater than the first preset exit time, the current temperature of the indoor coil is greater than the first preset exit temperature and is maintained for a second preset exit time; Alternatively, during the defrosting process of the air conditioner, after recording the lowest temperature of the indoor coil, the current temperature of the indoor coil is greater than the second exit preset temperature within the second exit preset time; Alternatively, during the defrosting process of the air conditioner, the current temperature of the indoor coil does not decrease within a third exit preset time.

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