CN-121655130-B - Defrosting control method and device for heat pump water heater, heat pump water heater and storage medium

CN121655130BCN 121655130 BCN121655130 BCN 121655130BCN-121655130-B

Abstract

The application provides a defrosting control method and device of a heat pump water heater, the heat pump water heater and a storage medium, and relates to the technical field of heat pumps, wherein the method comprises the steps that if a high-voltage switch protection shutdown mechanism is triggered during the ith defrosting period of the heat pump water heater, a first defrosting duration during the ith defrosting period is obtained, the frequency-reduction waiting duration corresponding to a compressor during the (i+1) th defrosting period of the heat pump water heater is determined according to the first defrosting duration, and the frequency-reduction waiting duration is smaller than the first defrosting duration; and when the second defrosting time reaches the frequency-reducing waiting time, reducing the running frequency of the compressor. According to the application, after the previous defrosting of the heat pump water heater is interrupted due to triggering of the high-voltage switch protection shutdown mechanism, the probability of interruption of defrosting operation can be reduced by reducing the time point of the operation frequency of the compressor in advance during each subsequent defrosting period, and the integrity and reliability of the defrosting process are ensured.

Inventors

GONG JIAJUN
HUANG LANGSHUI
SHEN WENTAO
WANG CHENCHEN
LI HONGWEI

Assignees

广东美的暖通设备有限公司
合肥美的暖通设备有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (12)

1. The defrosting control method for the heat pump water heater is characterized by comprising the following steps of: During heat Shui Qidi i times of defrosting of the heat pump, if a high-voltage switch protection stopping mechanism is triggered, acquiring a first defrosting time length of the heat pump water heater, wherein the first defrosting time length is a time interval between the starting time of the ith defrosting of the heat pump water heater and the triggering time of the high-voltage switch protection stopping mechanism, and i is more than or equal to 1; Determining a frequency-reduction waiting time length corresponding to a compressor when the i+1th defrosting of the heat pump water heater is performed according to the first defrosting time length, wherein the frequency-reduction waiting time length is smaller than the first defrosting time length; Acquiring a second defrosting duration of the heat pump water heater during the (i+1) th defrosting period of the heat pump water heater; and reducing the operating frequency of the compressor under the condition that the second defrosting duration reaches the frequency-reducing waiting duration.
2. The heat pump water heater defrost control method according to claim 1, wherein in the case where the second defrost period reaches the down-conversion waiting period, reducing the operating frequency of the compressor includes: Determining a target operating frequency of the compressor according to a first heat exchange temperature, a second heat exchange temperature and a reference operating frequency when the second defrosting duration reaches the frequency-reducing waiting duration, wherein the first heat exchange temperature is an inlet temperature of an outdoor heat exchanger during the i+1th defrosting of the heat pump water heater, the second heat exchange temperature is an inlet temperature of the outdoor heat exchanger when the high-voltage switch protection shutdown mechanism is triggered, and the reference operating frequency is an operating frequency of the compressor when the high-voltage switch protection shutdown mechanism is triggered; And reducing the operating frequency of the compressor to the target operating frequency.
3. The heat pump water heater defrost control method of claim 2, wherein determining the target operating frequency of the compressor based on the first heat exchange temperature, the second heat exchange temperature and the reference operating frequency comprises: Determining a frequency reduction according to the first heat exchange temperature and the second heat exchange temperature; and if the frequency reduction is smaller than or equal to a preset frequency reduction, the reference operating frequency is differenced from the frequency reduction, and the target operating frequency is obtained.
4. The heat pump water heater defrost control method of claim 2, wherein determining the target operating frequency of the compressor based on the first heat exchange temperature, the second heat exchange temperature and the reference operating frequency comprises: Determining a frequency reduction according to the first heat exchange temperature and the second heat exchange temperature; and if the frequency reduction is greater than a preset frequency reduction, the reference operating frequency is differenced from the preset frequency reduction, and the target operating frequency is obtained.
5. The heat pump water heater defrost control method according to claim 2, further comprising: Under the condition of triggering the high-voltage switch protection stopping mechanism, acquiring a first water temperature of the water storage tank; Judging whether the first water temperature is smaller than or equal to a preset water temperature threshold value; If the first water temperature is larger than the preset water temperature threshold value, if the heat pump water heater is started and the heating operation is executed again, obtaining a second water temperature of the water storage tank; If the second water temperature is greater than or equal to a water temperature difference value, acquiring the reference operating frequency, wherein the water temperature difference value is the difference value between the first water temperature and the temperature tolerance; After the heat pump water heater is started again and the heating operation is executed again, if the heat pump heat Shui Qidi i+1 times of defrosting is detected, acquiring the second defrosting duration; And if the second defrosting time is greater than or equal to a time difference value, acquiring the first heat exchange temperature, wherein the time difference value is a difference value between the first defrosting time and a time adjustment quantity.
6. The heat pump water heater defrost control method according to claim 2, further comprising: Under the condition of triggering the high-voltage switch protection stopping mechanism, acquiring a first water temperature of the water storage tank; Judging whether the first water temperature is smaller than or equal to a preset water temperature threshold value; if the first water temperature is smaller than or equal to the preset water temperature threshold value, if the heat pump water heater is started and the (i+1) th defrosting is started, acquiring the second defrosting duration; and if the second defrosting time length is greater than or equal to a time difference value, acquiring the reference operating frequency and the first heat exchange temperature, wherein the time difference value is a difference value between the first defrosting time length and a time adjustment quantity.
7. The defrosting control method of a heat pump water heater according to claim 5 or 6, wherein the determining the down-conversion waiting period corresponding to the compressor at the i+1th defrosting time of the heat pump water heater according to the first defrosting period includes: Determining a product of a preset duration adjustment coefficient corresponding to a third water temperature and the first defrosting duration to obtain a duration reduction amount, wherein the preset duration adjustment coefficient is more than 0 and less than 1, and the third water temperature is the water temperature of the water storage tank when the second defrosting duration is more than or equal to the time difference value; And the first defrosting duration is subjected to difference with the duration reduction amount, and the frequency reduction waiting duration is obtained.
8. The heat pump water heater defrost control method according to claim 7, wherein said heat pump water heater defrost control method further comprises, after decreasing an operating frequency of a compressor in a case where said second defrost period reaches said down-stand-by period: And if the high-voltage switch protection stopping mechanism is triggered in the (i+1) th defrosting period of the heat pump water heater, reducing the target operating frequency by a preset regulating value in the (i+2) th defrosting period of the heat pump water heater.
9. The heat pump water heater defrost control method according to claim 7, wherein said heat pump water heater defrost control method further comprises, after decreasing an operating frequency of a compressor in a case where said second defrost period reaches said down-stand-by period: during the (i+1) th defrosting period of the heat pump water heater, if the high-voltage switch protection stopping mechanism is not triggered, acquiring the fourth water temperature of the water storage tank and the exhaust temperature of the compressor; And if the difference value between the fourth water temperature and the exhaust temperature is larger than a preset temperature difference threshold value, increasing the preset time length adjusting coefficient corresponding to different water temperatures of the water storage tank in the (i+2) th defrosting period of the heat pump water heater.
10. A heat pump water heater defrost control apparatus, the heat pump water heater defrost control apparatus comprising: the first calculation module is used for acquiring a first defrosting duration of the heat pump water heater if a high-voltage switch protection stopping mechanism is triggered during the ith defrosting of the heat pump water heater, wherein the first defrosting duration is a time interval between the starting time of the ith defrosting of the heat pump water heater and the triggering time of the high-voltage switch protection stopping mechanism, and i is more than or equal to 1; the second calculation module is used for determining a frequency-reduction waiting time length corresponding to a compressor when the heat pump water heater is defrosted for the (i+1) th time according to the first defrosting time length, wherein the frequency-reduction waiting time length is smaller than the first defrosting time length; a time length obtaining module, configured to obtain a second defrosting time length of the heat pump water heater during the (i+1) th defrosting period of the heat pump water heater; and the parameter control module is used for reducing the operation frequency of the compressor under the condition that the second defrosting duration reaches the frequency-reducing waiting duration.
11. A heat pump water heater, characterized in that it comprises: A memory for storing executable program code; A processor for recalling and running the executable program code from the memory, causing the heat pump water heater to perform the heat pump water heater defrost control method as claimed in any one of claims 1 to 9.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed, implements the heat pump water heater defrost control method according to any one of claims 1 to 9.

Description

Defrosting control method and device for heat pump water heater, heat pump water heater and storage medium Technical Field The present application relates to the field of heat pump technology, and more particularly, to a heat pump water heater defrost control method and apparatus, a heat pump water heater, and a computer readable storage medium in the field of heat pump technology. Background The european union regulations prohibit the use of refrigerants having global warming potential (Global Warming Potential, GWP) exceeding 150. The R454C refrigerant scheme is adopted, has GWP of 148, is slightly inflammable (A2L grade), is suitable for a sealing system, meets the policy requirement of 150 threshold set by European Union F-Gas regulations, is one of main stream choices for replacing high GWP refrigerants (such as R404A, R A), and can allow higher filling quantity. After the heat pump water heater is used for a long time, if the fins are blocked, or the heat pump water heater runs under the condition of limited installation environment, the heat exchange efficiency can be deteriorated. In the later stage of defrosting operation, the exhaust pressure of the system can be increased sharply, particularly under the working condition of low temperature and high humidity, the condensing load is concentrated, the heat dissipation condition is deteriorated in the defrosting process, and the high-voltage switch is triggered to protect and stop the machine very easily, so that defrosting interruption and frost layer residue are caused. The system is easy to reduce the subsequent heating efficiency of the system, and the problems of liquid return, frequent start and stop and the like of the compressor can be caused, so that the stability and reliability of the system operation and the experience of a user are seriously affected. Disclosure of Invention The embodiment of the application provides a defrosting control method and device for a heat pump water heater, the heat pump water heater and a computer readable storage medium, wherein after the heat pump water heater is interrupted due to triggering of a high-voltage switch protection shutdown mechanism in the previous defrosting, the probability of interruption of defrosting operation can be reduced by reducing the time point of the operation frequency of a compressor in advance during each subsequent defrosting period, the complete execution of the defrosting process is ensured, and the reliability of defrosting is improved. According to the first aspect, a defrosting control method of a heat pump water heater is provided, and the defrosting control method comprises the steps of acquiring a first defrosting time length of the heat pump water heater if a high-voltage switch protection stopping mechanism is triggered during the ith defrosting period of the heat pump water heater, wherein the first defrosting time length is a time interval between a starting time of heat pump heat Shui Qidi i defrosting and a triggering time of the high-voltage switch protection stopping mechanism, i is more than or equal to 1, determining a frequency-reduction waiting time length corresponding to a compressor during the ith+1th defrosting period of the heat pump water heater according to the first defrosting time length, wherein the frequency-reduction waiting time length is smaller than the first defrosting time length, acquiring a second defrosting time length of the heat pump water heater during the ith+1th defrosting period of the heat pump water heater, and reducing the running frequency of the compressor under the condition that the second defrosting time length reaches the frequency-reduction waiting time length. According to the technical scheme, during defrosting of the heat pump water heater, if the heat pump water heater is stopped due to triggering of a high-voltage switch protection stopping mechanism, the time interval between defrosting starting and stopping of the heat pump water heater is recorded, then the time interval is reduced, the reduced time interval is used as the frequency-reduction waiting time corresponding to the compressor when the heat pump water heater is defrosted next time, if the defrosting time is detected to reach the frequency-reduction waiting time, the operating frequency of the compressor is reduced, the operating frequency of the compressor is actively reduced before a high-voltage air risk occurs in a system, work of the compressor is reduced, the exhaust pressure of the compressor can be effectively restrained from rising rapidly, the system is prevented from triggering the high-voltage switch protection stopping again, and the complete execution of the defrosting process is ensured. In one possible implementation, reducing the operating frequency of the compressor when the second defrost duration reaches the down-stand-by duration includes determining a target operating frequency of the compressor based on a first heat exchange tempera