阅读说明：本技术 一种自清洗热泵系统及其自清洗控制方法 (Self-cleaning heat pump system and self-cleaning control method thereof ) 是由 刘乾坤 朱龙华 张超 王鹏 陶祥成 李鹏飞 于 2020-06-03 设计创作，主要内容包括：本发明公开了一种自清洗热泵系统及其自清洗控制方法,其中,自清洗热泵系统包括压缩机、压力传感器、四通阀、风机、翅片换热器、第一单向阀、第二单向阀、第三单向阀、储液器、干燥过滤器、第四单向阀、壳管换热器、气液分离器以及喷淋装置。本发明所提供的自清洗热泵系统及其自清洗控制方法,实现了大型空气源热泵翅片换热器自动清洗,且可以根据系统运行参数,自动判断是否需要清洗,保证系统能够始终高效的运行。在环温较高,高压异常偏高时,通过打开自清洗回路,将低温水喷淋在翅片上,实现冷凝压力的降低,使系统可以在异常高温天气正常运行。(The invention discloses a self-cleaning heat pump system and a self-cleaning control method thereof, wherein the self-cleaning heat pump system comprises a compressor, a pressure sensor, a four-way valve, a fan, a finned heat exchanger, a first one-way valve, a second one-way valve, a third one-way valve, a liquid storage device, a drying filter, a fourth one-way valve, a shell and tube heat exchanger, a gas-liquid separator and a spraying device. The self-cleaning heat pump system and the self-cleaning control method thereof provided by the invention realize the automatic cleaning of the large-scale air source heat pump fin heat exchanger, and can automatically judge whether the system needs cleaning according to the system operation parameters, thereby ensuring that the system can always run efficiently. When the environment temperature is high and the high pressure is abnormally high, the low-temperature water is sprayed on the fins by opening the self-cleaning loop, so that the reduction of the condensation pressure is realized, and the system can normally run in abnormal high-temperature weather.)

1. A self cleaning heat pump system, comprising:

the four-way valve is respectively connected with the compressor, the fin heat exchanger, the shell and tube heat exchanger and the gas-liquid separator through pipelines;

the spraying device is arranged near the fin heat exchanger, communicated with a water inlet pipe of the shell and tube heat exchanger through a pipeline and used for spraying water to the fin heat exchanger;

the fan is arranged above the fin heat exchanger and used for carrying out air cooling and heat dissipation on the fin heat exchanger;

the first check valve and the third check valve are connected through a pipeline;

the second one-way valve and the fourth one-way valve are connected through a pipeline;

the liquid storage device and the drying filter are connected through a pipeline; the liquid storage device is connected with a pipeline between the first one-way valve and the third one-way valve, and the drying filter is connected with a pipeline between the second one-way valve and the fourth one-way valve;

the compressor is connected with the gas-liquid separator through a pipeline, a pressure sensor is connected to the pipeline between the compressor and the four-way valve, the first one-way valve and the second one-way valve are both connected with the fin heat exchanger through pipelines, and the third one-way valve and the fourth one-way valve are both connected with the shell and tube heat exchanger through pipelines.

2. The self-cleaning heat pump system of claim 1, further comprising:

and one end of the electronic expansion valve is connected with the drying filter through a pipeline, and the other end of the electronic expansion valve is connected with a pipeline between the second one-way valve and the fourth one-way valve through a pipeline.

3. A self-cleaning heat pump system according to claim 1 or claim 2, wherein the spray means comprises at least one spray pipe disposed adjacent to the finned heat exchanger and in communication with the inlet pipe of the shell and tube heat exchanger via a conduit, the spray pipe being provided with at least one spray head for spraying water toward the finned heat exchanger.

4. The self-cleaning heat pump system of claim 3, wherein the plurality of showers are provided with a plurality of spray heads on each shower.

5. The self-cleaning heat pump system of claim 4, wherein each shower is in communication with the inlet conduit of the shell and tube heat exchanger via a manifold.

6. A self-cleaning heat pump system according to claim 5, wherein the manifold carries a solenoid valve.

7. A self-cleaning heat pump system according to claim 6, wherein a manifold is connected to the manifold.

8. The self-cleaning heat pump system of claim 7, wherein the manifold has a drain angle valve mounted thereon.

9. The self-cleaning heat pump system of claim 4, wherein each shower is secured to the metal plate of the finned heat exchanger by a retainer clip.

10. The self-cleaning heat pump system of claim 8, in which the self-cleaning control method comprises:

passing through the environmentTemperature sensor collects ambient temperature T_aAcquiring converted absolute pressure P through a pressure sensor, and judging acquired parameters through a controller;

according to the formula, T_c＝a₂/(lnP-a₁)-a₃Calculating the condensing temperature T corresponding to the absolute pressure P_c；a₁、a₂、a₃The parameters of the calculation formula are different from refrigerant to refrigerant;

according to the ring temperature T_aAnd a condensation temperature T_cThe difference between them to determine if the system needs cleaning:

a. when T is_aAt a temperature of not less than 40 DEG C

When T is_c-T_a≥ΔT₁The timer starts to time when the duration t is more than t_s1When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

b. when the temperature is less than or equal to 35 ℃ and T is less than or equal to_aAt a temperature of < 40 DEG C

When T is_c-T_a≥ΔT₂The timer starts to time when the duration t is more than t_s2When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

c. when the temperature is less than or equal to 25 ℃ and T is less than or equal to_aAt a temperature of < 30 DEG C

When T is_c-T_a≥ΔT₃The timer starts to time when the duration t is more than t_s3When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

d. when T is_aAt < 25 deg.C

When T is_c-T_a≥ΔT₄The timer starts to time when the duration t is more than t_s4When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

during the time counting process of the timer, if T_c-T_aWhen the difference does not satisfy the timing condition, the timer is clearedRestarting timing after the condition is met;

when the unit meets the conditions and enters the cleaning function, the timer is cleared and then starts timing again, and self-cleaning time is recorded; after the self-cleaning is finished, resetting the timer again, judging according to the conditions again, and starting timing after the conditions are met;

when the following conditions are met, the electromagnetic valve is closed through the controller, and the system exits from the self-cleaning function:

i, self-cleaning the longest set time t_s5To;

II, unit condensation temperature T_c-T_a＜ΔT₅When the time is up, the timer starts to time, and when the duration t is more than t_s6When the machine set is in use, the machine set quits the cleaning function;

the above-mentioned Delta T₁、ΔT₂、ΔT₃、ΔT₄、ΔT₅Respectively, different preset temperature difference values t_s1、t_s2、t_s3、t_s4、t_s5、t_s6Respectively different preset times;

in some time periods in summer, the self-cleaning heat pump system can be started, and the specific control method comprises the following steps:

when T is_a≥T_maxThe self-cleaning device is controlled by the following method:

when P is more than or equal to P₁The timer starts to time when the duration t is more than t_s7When the system is used, the control module controls the electromagnetic valve to be opened, water is sprayed onto fins of the fin heat exchanger through the spray head, and the fins are cooled, so that the condensing pressure of the system is reduced;

when P < P₂The timer starts to time when the duration t is more than t_s8When the electromagnetic valve is closed, the electromagnetic valve is controlled to be closed through the control module;

P₂≤P＜P₁the control module judges the state of the electromagnetic valve at the previous moment and maintains the state;

t above_maxFor a preset maximum ambient temperature, P is the absolute pressure converted by the pressure sensor acquisition, P₁At a predetermined upper pressure limit, P₂To preset a lower pressure limit, t_s7、t_s8Respectively different preset times;

when the system starts a heating mode, the self-cleaning function is closed, and the default system can finish the fin cleaning by self defrosting;

when the system starts a heating mode, a drainage angle valve on the self-cleaning pipeline is manually opened, and water in the self-cleaning pipeline is emptied.

Technical Field

The invention relates to the technical field of air source heat pumps, in particular to a self-cleaning heat pump system and a self-cleaning control method thereof.

Background

The air source heat pump system is generally arranged on the top of a building or in an open air area, and the fin heat exchanger is easily blocked by pollutants such as dust, flocks, floaters and the like during long-term operation. The dirt accumulated on the fins hinders the fins from contacting with air, so that the heat exchange capacity of the fin heat exchanger is reduced, and the overall performance of the heat pump system is reduced. And dirty blocking also easily causes the heat pump system condensing pressure to rise, leads to the frequent high pressure protection of compressor, seriously shortens compressor life.

For a large-scale air source heat pump system, in the prior art, a specific solution is not provided for the problem of dirty and blocking of a fin heat exchanger, and the fins of the heat pump system still need to be cleaned manually and regularly to avoid the reduction of the condensation effect of the heat exchanger, so that the performance of the system is guaranteed, but the mode consumes manpower and material resources very much.

For a household air conditioner, in the existing self-cleaning technology of an outdoor unit condenser, a spray pipeline and a water tank connected with the spray pipeline are usually arranged above a heat exchanger, when the heat exchanger is cleaned, water in the water tank is sent into the spray pipeline through a water pump, and the water is sprayed on the heat exchanger through the spray pipeline. Because need set up the water storage box alone to need dedicated washing circulating pump, the system is complicated, and the system mainly judges whether to wash according to the water tank water level, and whether to judge the system according to system's own operating parameter and need wash, probably causes frequent abluent phenomenon, extravagant energy.

Disclosure of Invention

The invention aims to provide a self-cleaning heat pump system and a self-cleaning control method thereof, which can realize the self-cleaning function of a large-scale air source heat pump fin heat exchanger and solve the problems of time and labor waste caused by manual cleaning.

Meanwhile, the self-cleaning heat pump system can automatically judge whether the system needs to be cleaned according to system operation parameters, so that damage to the system caused by untimely manual cleaning is avoided, and the system can be ensured to operate efficiently all the time.

When the environment temperature is high and the high pressure is abnormally high, the low-temperature water is sprayed on the fins by opening the self-cleaning loop, so that the reduction of the condensation pressure is realized, and the system can normally run in abnormal high-temperature weather.

In order to achieve the above purpose, the invention provides the following technical scheme:

a self cleaning heat pump system, comprising:

the four-way valve is respectively connected with the compressor, the fin heat exchanger, the shell and tube heat exchanger and the gas-liquid separator through pipelines;

the spraying device is arranged near the fin heat exchanger, communicated with a water inlet pipe of the shell and tube heat exchanger through a pipeline and used for spraying water to the fin heat exchanger;

the fan is arranged above the fin heat exchanger and used for carrying out air cooling and heat dissipation on the fin heat exchanger;

the first check valve and the third check valve are connected through a pipeline;

the second one-way valve and the fourth one-way valve are connected through a pipeline;

the liquid storage device and the drying filter are connected through a pipeline; the liquid storage device is connected with a pipeline between the first one-way valve and the third one-way valve, and the drying filter is connected with a pipeline between the second one-way valve and the fourth one-way valve;

the compressor is connected with the gas-liquid separator through a pipeline, a pressure sensor is connected to the pipeline between the compressor and the four-way valve, the first one-way valve and the second one-way valve are both connected with the fin heat exchanger through pipelines, and the third one-way valve and the fourth one-way valve are both connected with the shell and tube heat exchanger through pipelines.

Further, the self-cleaning heat pump system further comprises:

and one end of the electronic expansion valve is connected with the drying filter through a pipeline, and the other end of the electronic expansion valve is connected with a pipeline between the second one-way valve and the fourth one-way valve through a pipeline.

Furthermore, the spraying device comprises at least one spraying pipe which is arranged near the fin heat exchanger and communicated with the water inlet pipe of the shell and tube heat exchanger through a pipeline, and at least one spray head which sprays water towards the fin heat exchanger is arranged on the spraying pipe.

Furthermore, the spraying pipes are multiple, and each spraying pipe is provided with a plurality of spray heads.

Furthermore, each spray pipe is communicated with the water inlet pipe of the shell-and-tube heat exchanger through a main pipe.

Furthermore, the main pipe is provided with an electromagnetic valve.

Furthermore, a branch pipe is connected to the main pipe.

Furthermore, a drainage angle valve is arranged on the branch pipe.

Furthermore, each spray pipe is fixed with a metal plate on the fin heat exchanger through a fixing clamp.

The self-cleaning heat pump system has the following self-cleaning control method:

acquisition of ambient temperature T by ambient temperature sensor_aAcquiring converted absolute pressure P through a pressure sensor, and judging acquired parameters through a controller;

according to the formula, T_c＝a₂/(lnP-a₁)-a₃Calculating the condensing temperature T corresponding to the absolute pressure P_c；a₁、a₂、a₃The parameters of the calculation formula are different from refrigerant to refrigerant;

according to the ring temperature T_aAnd a condensation temperature T_cThe difference between them to determine if the system needs cleaning:

a. when T is_aAt a temperature of not less than 40 DEG C

When T is_c-T_a≥ΔT₁The timer starts to time when the duration t is more than t_s1When passing throughThe control module controls the electromagnetic valve to be opened, and water is sprayed onto the fins of the fin heat exchanger through the spray head to clean the fins;

b. when the temperature is less than or equal to 35 ℃ and T is less than or equal to_aAt a temperature of < 40 DEG C

When T is_c-T_a≥ΔT₂The timer starts to time when the duration t is more than t_s2When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

c. when the temperature is less than or equal to 25 ℃ and T is less than or equal to_aAt a temperature of < 30 DEG C

When T is_c-T_a≥ΔT₃The timer starts to time when the duration t is more than t_s3When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

d. when T is_aAt < 25 deg.C

When T is_c-T_a≥ΔT₄The timer starts to time when the duration t is more than t_s4When the water is sprayed to the fins of the fin heat exchanger, the control module controls the electromagnetic valve to be opened, and the water is sprayed to the fins of the fin heat exchanger through the spray head to clean the fins;

during the time counting process of the timer, if T_c-T_aWhen the difference does not meet the timing condition, the timer is reset, and timing is restarted after the condition is met;

when the unit meets the conditions and enters the cleaning function, the timer is cleared and then starts timing again, and self-cleaning time is recorded; after the self-cleaning is finished, resetting the timer again, judging according to the conditions again, and starting timing after the conditions are met;

when the following conditions are met, the electromagnetic valve is closed through the controller, and the system exits from the self-cleaning function:

i, self-cleaning the longest set time t_s5To;

II, unit condensation temperature T_c-T_a＜ΔT₅When the time is up, the timer starts to time, and when the duration t is more than t_s6When the machine set is in use, the machine set quits the cleaning function;

as described aboveΔT₁、ΔT₂、ΔT₃、ΔT₄、ΔT₅Respectively, different preset temperature difference values t_s1、t_s2、t_s3、t_s4、t_s5、t_s6Respectively different preset times;

in some time periods in summer, the self-cleaning heat pump system can be started, and the specific control method comprises the following steps:

when T is_a≥T_maxThe self-cleaning device is controlled by the following method:

when P is more than or equal to P₁The timer starts to time when the duration t is more than t_s7When the system is used, the control module controls the electromagnetic valve to be opened, water is sprayed onto fins of the fin heat exchanger through the spray head, and the fins are cooled, so that the condensing pressure of the system is reduced;

when P < P₂The timer starts to time when the duration t is more than t_s8When the electromagnetic valve is closed, the electromagnetic valve is controlled to be closed through the control module;

P₂≤P＜P₁the control module judges the state of the electromagnetic valve at the previous moment and maintains the state;

t above_maxFor a preset maximum ambient temperature, P is the absolute pressure converted by the pressure sensor acquisition, P₁At a predetermined upper pressure limit, P₂To preset a lower pressure limit, t_s7、t_s8Respectively different preset times;

when the system starts a heating mode, the self-cleaning function is closed, and the default system can finish the fin cleaning by self defrosting;

when the system starts a heating mode, a drainage angle valve on the self-cleaning pipeline is manually opened, and water in the self-cleaning pipeline is emptied.

The self-cleaning heat pump system and the self-cleaning control method thereof have the following beneficial effects:

1. the automatic cleaning of the large-scale air source heat pump fin heat exchanger is realized, whether cleaning is needed or not can be automatically judged according to system operation parameters, and the system can be guaranteed to operate efficiently all the time.

2. When the environment temperature is high and the high pressure is abnormally high, the low-temperature water is sprayed on the fins by opening the self-cleaning loop, so that the reduction of the condensation pressure is realized, and the system can normally run in abnormal high-temperature weather.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic diagram of a self-cleaning heat pump system provided by an embodiment of the present invention;

FIG. 2 is a partial view of a self cleaning heat pump system provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a self-cleaning heat pump system according to an embodiment of the present invention.

Description of reference numerals:

1. a compressor; 2. a pressure sensor; 3. a four-way valve; 4. a fan; 5. a finned heat exchanger; 6. a spray head; 7. fixing the card; 8. a first check valve; 9. a second one-way valve; 10. a third check valve; 11. a reservoir; 12. drying the filter; 13. an electronic expansion valve; 14. a fourth check valve; 15. a shell and tube heat exchanger; 16. an electromagnetic valve; 17. a drain angle valve; 18. a gas-liquid separator.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

Referring to fig. 1-3, a self-cleaning heat pump system includes:

the four-way valve 3 is respectively connected with the compressor 1, the fin heat exchanger 5, the shell and tube heat exchanger 15 and the gas-liquid separator 18 through pipelines;

the spraying device is arranged near the fin heat exchanger 5, communicated with a water inlet pipe of the shell and tube heat exchanger 15 through a pipeline and used for spraying water to the fin heat exchanger 5;

the fan 4 is arranged above the fin heat exchanger 5 and used for cooling the fin heat exchanger 5 by air;

the first check valve 8 and the third check valve 10 are connected through a pipeline;

the second one-way valve 9 and the fourth one-way valve 14 are connected through a pipeline;

the liquid storage device 11 and the drying filter 12 are connected through a pipeline; the liquid storage device 11 is connected with a pipeline between the first check valve 8 and the third check valve 10, and the dry filter 12 is connected with a pipeline between the second check valve 9 and the fourth check valve 14;

and one end of the electronic expansion valve 13 is connected with the dry filter 12 through a pipeline, and the other end of the electronic expansion valve is connected with a pipeline between the second one-way valve 9 and the fourth one-way valve 14 through a pipeline.

The compressor 1 is connected with the gas-liquid separator 18 through a pipeline, the pipeline between the compressor 1 and the four-way valve 3 is connected with the pressure sensor 2, the first check valve 8 and the second check valve 9 are both connected with the fin heat exchanger 5 through pipelines, and the third check valve 10 and the fourth check valve 14 are both connected with the shell and tube heat exchanger 15 through pipelines.

The spraying device comprises at least one spraying pipe which is arranged near the fin heat exchanger 5 and communicated with the water inlet pipe of the shell and tube heat exchanger 15 through a pipeline, and at least one spray head 6 which sprays water towards the fin heat exchanger 5 is arranged on the spraying pipe.

In this embodiment, the number of the spraying pipes is multiple, and each spraying pipe is provided with a plurality of spray heads 6. As shown in fig. 1 to 3, each shower pipe communicates with the inlet pipe of the shell-and-tube heat exchanger 15 through a header pipe. The main pipe is provided with an electromagnetic valve 16, the main pipe is also connected with a branch pipe for draining water, and the branch pipe is provided with a draining angle valve 17. Each spray pipe is fixed with a metal plate on the fin heat exchanger 5 through a fixing clamp 7.

Specifically, the self-cleaning heat pump system comprises a compressor 1, a pressure sensor 2, a four-way valve 3, a fan 4, a fin heat exchanger 5, a spray head 6, a fixing clamp 7, a first one-way valve 8, a second one-way valve 9, a third one-way valve 10, a liquid storage device 11, a drying filter 12, an electronic expansion valve 13, a fourth one-way valve 14, a shell and tube heat exchanger 15, an electromagnetic valve 16, a drainage angle valve 17 and a gas-liquid separator 18.

Wherein, the four-way valve 3 is respectively connected with the compressor 1, the fin heat exchanger 5, the shell and tube heat exchanger 15 and the gas-liquid separator 18 through pipelines. The spraying device is arranged near the fin heat exchanger 5 and communicated with the fin heat exchanger through a pipeline and is used for spraying water to the fin heat exchanger 5. The fan 4 is preferably an axial flow fan, which is disposed above the fin heat exchanger 5 and is used for cooling and dissipating heat of the fin heat exchanger 5.

The first check valve 8 and the third check valve 10 are connected through a pipeline. The second check valve 9 and the fourth check valve 14 are connected through a pipeline. The reservoir 11 and the dry filter 12 are connected by a pipeline. The reservoir 11 is connected to the line between the first check valve 8 and the third check valve 10, and the filter-drier 12 is connected to the line between the second check valve 9 and the fourth check valve 14. One end of the electronic expansion valve 13 is connected with the dry filter 12 through a pipeline, and the other end is connected with a pipeline between the second one-way valve 9 and the fourth one-way valve 14 through a pipeline.

The compressor 1 is connected with the gas-liquid separator 18 through a pipeline, the pipeline between the compressor 1 and the four-way valve 3 is connected with the pressure sensor 2, the first check valve 8 and the second check valve 9 are both connected with the fin heat exchanger 5 through pipelines, and the third check valve 10 and the fourth check valve 14 are both connected with the shell and tube heat exchanger 15 through pipelines.

In this embodiment, the spraying device includes a plurality of spraying pipes disposed near the fin heat exchanger 5 and communicated with the water inlet pipe of the shell-and-tube heat exchanger 15 through a pipeline, and each spraying pipe may be fixed to the metal plate on the fin heat exchanger 5. Each spray pipe is provided with a plurality of spray heads 6 which spray water towards the finned heat exchanger 5.

As shown in fig. 1 to 3, each shower pipe communicates with the inlet pipe (inlet end in fig. 1) of the shell-and-tube heat exchanger 15 through a header pipe. The main pipe is provided with an electromagnetic valve 16, the main pipe is also connected with a branch pipe for draining water, and the branch pipe is provided with a draining angle valve 17. Each spray pipe is fixed with a metal plate on the fin heat exchanger 5 through a fixing clamp 7.

The air source heat pump system is composed of the compressor 1, the pressure sensor 2, the four-way valve 3, the fin heat exchanger 5, the first one-way valve 8, the second one-way valve 9, the third one-way valve 10, the liquid storage device 11, the drying filter 12, the electronic expansion valve 13, the fourth one-way valve 14, the shell and tube heat exchanger 15 and the gas-liquid separator 18.

The spray pipe, the spray head 6, the header pipe, the electromagnetic valve 16 and the drainage angle valve 17 form a spray device for spraying water to the fin heat exchanger 5.

The self-cleaning heat pump system in the embodiment has the following self-cleaning control method:

acquisition of ambient temperature T by ambient temperature sensor_aThe converted absolute pressure P is acquired by the pressure sensor, the acquired parameters are judged by the controller, and the self-cleaning system is controlled according to the following control method, so that the self-cleaning function is realized.

According to the formula, T_c＝a₂/(lnP-a₁)-a₃Calculating the condensing temperature T corresponding to the absolute pressure P_c；a₁、a₂、a₃The parameters are different for different refrigerants according to the calculation formula parameters.

According to the ring temperature T_aAnd a condensation temperature T_cThe difference between them to determine if the system needs cleaning:

a. when T is_aAt a temperature of not less than 40 DEG C

When T is_c-T_a≥ΔT₁(preset temperature difference), the timer starts to time when the duration t is more than t_s1When the time is preset, the electromagnetic valve 16 is controlled to be opened through the control module, and water is sprayed onto the fins of the fin heat exchanger 5 through the spray head 6 to clean the fins.

b. When the temperature is less than or equal to 35 ℃ and T is less than or equal to_aAt a temperature of < 40 DEG C

When T is_c-T_a≥ΔT₂(preset temperature difference), the timer starts to time when the duration t is more than t_s2When the time is preset, the electromagnetic valve 16 is controlled to be opened through the control module, and water is sprayed to the fins of the fin heat exchanger 5 through the spray head 6And cleaning the fins.

c. When the temperature is less than or equal to 25 ℃ and T is less than or equal to_aAt a temperature of < 30 DEG C

When T is_c-T_a≥ΔT₃(preset temperature difference), the timer starts to time when the duration t is more than t_s3When the time is preset, the electromagnetic valve 16 is controlled to be opened through the control module, and water is sprayed onto the fins of the fin heat exchanger 5 through the spray head 6 to clean the fins.

d. When T is_aAt < 25 deg.C

When T is_c-T_a≥ΔT₄(preset temperature difference), the timer starts to time when the duration t is more than t_s4When the time is preset, the electromagnetic valve 16 is controlled to be opened through the control module, and water is sprayed onto the fins of the fin heat exchanger 5 through the spray head 6 to clean the fins.

Note: during the time counting process of the timer, if T_c-T_aAnd when the difference does not meet the timing condition, resetting the timer, and restarting timing after the condition is met.

When the unit meets the conditions and enters the cleaning function, the timer is cleared and then starts timing again, and self-cleaning time is recorded; and after the self-cleaning is finished, resetting the timer again, judging according to the conditions again, and starting timing after the conditions are met.

The system exits the self-cleaning function by the controller closing the solenoid valve 16 when the following conditions are met:

i, self-cleaning the longest set time t_s5To;

II, unit condensation temperature T_c-T_a＜ΔT₅When the time is up, the timer starts to time, and when the duration t is more than t_s6When the machine set is in use, the machine set quits the cleaning function;

the above-mentioned Delta T₁、ΔT₂、ΔT₃、ΔT₄、ΔT₅Respectively, different preset temperature difference values t_s1、t_s2、t_s3、t_s4、t_s5、t_s6Respectively different preset times;

the cleaning system can also have an auxiliary effect, namely in certain ultrahigh environment temperature time periods in summer, the system runs with the risk of reporting high pressure, in the high temperature time periods, the self-cleaning system can be started, water with lower temperature is sprayed on the surface of the fin heat exchanger 5, the high pressure of the system is reduced, and the system can run safely under the high environment temperature.

When T is_a≥T_maxThe self-cleaning device is controlled by the following method:

when P is more than or equal to P₁The timer starts to time when the duration t is more than t_s7When the system is used, the control module controls the electromagnetic valve to be opened, water is sprayed onto fins of the fin heat exchanger through the spray head, and the fins are cooled, so that the condensing pressure of the system is reduced;

when P < P₂The timer starts to time when the duration t is more than t_s8When the electromagnetic valve is closed, the electromagnetic valve is controlled to be closed through the control module;

P₂≤P＜P₁the control module judges the state of the electromagnetic valve at the previous moment and maintains the state;

t above_maxFor a preset maximum ambient temperature, P is the absolute pressure converted by the pressure sensor acquisition, P₁At a predetermined upper pressure limit, P₂To preset a lower pressure limit, t_s7、t_s8Respectively different preset times;

when the system starts a heating mode, the self-cleaning function is closed, and the default system can finish the fin cleaning by self defrosting;

when the system starts a heating mode, the drainage angle valve 17 on the self-cleaning pipeline is manually opened to drain water in the self-cleaning pipeline, so that the frost crack of the pipeline is prevented.

The self-cleaning heat pump system and the self-cleaning control method thereof provided by the embodiment have the following beneficial effects:

1. the automatic cleaning of the large-scale air source heat pump fin heat exchanger is realized, whether cleaning is needed or not can be automatically judged according to system operation parameters, and the system can be guaranteed to operate efficiently all the time.

2. When the environment temperature is high and the high pressure is abnormally high, the low-temperature water is sprayed on the fins by opening the self-cleaning loop, so that the reduction of the condensation pressure is realized, and the system can normally run in abnormal high-temperature weather.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.