CN-122015292-A - Dry heating prevention control method and device for heat pump water heater, heat pump water heater and medium

CN122015292ACN 122015292 ACN122015292 ACN 122015292ACN-122015292-A

Abstract

The application provides a control method and a device for preventing dry heating of a heat pump water heater, the heat pump water heater and a computer readable storage medium, and relates to the technical field of heat pump water heaters. Under the condition that the heat pump water heater has suspected dry-heating risk, verifying the authenticity of the heat pump water heater with the dry-heating risk according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters, and under the condition that the authenticity verification of the heat pump water heater with the dry-heating risk is passed, controlling the heat pump water heater to execute the dry-heating protection operation. The application effectively avoids the false triggering of the dry burning protection under the condition of water in the water storage tank, and remarkably improves the accuracy and reliability of the dry burning detection.

Inventors

GONG JIAJUN
WANG CHENCHEN
LI HONGWEI
HUANG LIANGWEI
SHEN WENTAO

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: 20260512
Application Date: 20260209

Claims (10)

1. The dry heating prevention control method for the heat pump water heater is characterized by comprising the following steps of: Under the condition that the heat pump water heater operates, judging whether the heat pump water heater has suspected dry burning risk according to the outdoor environment temperature, the upper temperature of a water tank of the water storage tank and the lower temperature of the water tank; Under the condition that the heat pump water heater has suspected dry heating risk, verifying the authenticity of the heat pump water heater having the dry heating risk according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters; and under the condition that the authenticity verification of the dry heating risk of the heat pump water heater is passed, controlling the heat pump water heater to execute the dry heating protection operation.
2. The method for controlling the heat pump water heater to prevent dry combustion according to claim 1, wherein the judging whether the heat pump water heater has a suspected risk of dry combustion according to the outdoor environment temperature, the upper temperature of the water tank of the water storage tank and the lower temperature of the water tank comprises: Judging whether a target temperature difference is larger than or equal to a temperature difference threshold corresponding to the outdoor environment temperature or not at each first time interval, wherein the target temperature difference is a difference value between a smaller value of the upper temperature of the water tank and the lower temperature of the water tank at a first time and a smaller value of the upper temperature of the water tank and the lower temperature of the water tank at a second time, and the first time is a difference value between the first time and the second time before the first time; And if the target temperature difference is greater than or equal to a temperature difference threshold corresponding to the outdoor environment temperature, and the first continuous accumulated times of the target temperature difference greater than or equal to the temperature difference threshold corresponding to the outdoor environment temperature is greater than or equal to a first time number threshold, determining that the heat pump water heater has suspected dry burning risk.
3. The method for controlling the heat pump water heater to prevent dry heating according to claim 2, wherein verifying the authenticity of the heat pump water heater that the risk of dry heating exists according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters comprises: Under the condition that the heat pump water heater is suspected of being at risk of dry combustion, after a second time period, acquiring a first working condition parameter, and determining a first actual heat exchange amount and a first theoretical heat exchange amount under the first working condition parameter, wherein the first working condition parameter comprises an average value of the compressor running frequency, the outdoor environment temperature, the upper water tank temperature and the lower water tank temperature when the second time period arrives; under the condition that a first condition is met, obtaining a second working condition parameter every third time, and determining a second actual heat exchange amount and a second theoretical heat exchange amount under the second working condition parameter, wherein the first condition comprises that the first actual heat exchange amount is larger than or equal to a first product, the first product is a product of a first heat exchange amount correction coefficient and the second theoretical heat exchange amount, the first heat exchange amount correction system is larger than 1, and the second working condition parameter comprises an average value of a compressor running frequency, an outdoor environment temperature, a water tank upper temperature and a water tank lower temperature when the third time is reached; and verifying the authenticity of the heat pump water heater with the risk of dry combustion according to the second actual heat exchange amount and the second theoretical heat exchange amount determined by the third time interval.
4. The method for controlling the heat pump water heater according to claim 3, wherein verifying the authenticity of the heat pump water heater that the risk of dry heating exists according to the second actual heat exchange amount and the second theoretical heat exchange amount determined by the third time period every interval comprises: under the condition that a second condition is met, determining that the authenticity verification of the heat pump water heater with the dry heating risk is passed, wherein the second condition comprises that the second actual heat exchange amount determined by the third time interval is larger than or equal to a second product, and a second continuous accumulated number of times of which the second actual heat exchange amount determined by the third time interval is larger than or equal to the second product is larger than or equal to a second number of times threshold, and the second product is the product of a second heat exchange amount correction coefficient and the second theoretical heat exchange amount, and the second heat exchange amount correction system is larger than 1; And under the condition that the second condition is not met, determining that the authenticity of the heat pump water heater with the dry burning risk is not verified.
5. The method for controlling the dry heating prevention of the heat pump water heater according to claim 4, further comprising: acquiring a third working condition parameter every fourth time interval under the condition that the second condition is met, and determining a third actual heat exchange amount and a third theoretical heat exchange amount under the third working condition parameter, wherein the third working condition parameter comprises an average value of the compressor running frequency, the outdoor environment temperature, the upper water tank temperature and the lower water tank temperature when the fourth time interval arrives; and verifying the authenticity of the heat pump water heater with the risk of dry combustion according to the third actual heat exchange amount and the third theoretical heat exchange amount determined by the fourth time interval.
6. The method of claim 5, wherein verifying the authenticity of the heat pump water heater that the risk of dry heating exists according to the third actual heat exchange amount and the third theoretical heat exchange amount determined in each interval of the fourth duration comprises: Determining that the authenticity verification of the heat pump water heater with the dry heating risk passes under the condition that a third condition is met, wherein the third condition comprises that the third actual heat exchange amount determined by the fourth time interval is larger than or equal to a third product, a third continuous accumulated number of times of which the third actual heat exchange amount determined by the fourth time interval is larger than or equal to the third product is larger than or equal to a third number of times threshold, the third product is the product of a third heat exchange amount correction coefficient and the third theoretical heat exchange amount, and the third heat exchange amount correction system is larger than 1; And under the condition that the third condition is not met, determining that the authenticity of the heat pump water heater with the dry burning risk is not verified.
7. The method for controlling the dry heating prevention of the heat pump water heater according to claim 5, further comprising: Under the condition that the heat pump water heater is suspected of being at risk of dry combustion, the first duration is increased, and the second duration is obtained; Under the condition that the first condition is met, the second time length is increased, and the third time length is obtained; And increasing the third time length to obtain the fourth time length under the condition that the second condition is met.
8. The utility model provides a heat pump water heater prevents dry combustion method controlling means which characterized in that, heat pump water heater prevents dry combustion method controlling means includes: The risk judging module is used for judging whether the heat pump water heater has suspected dry heating risk according to the outdoor environment temperature, the upper temperature of the water tank of the water storage tank and the lower temperature of the water tank under the condition that the heat pump water heater operates; The risk verification module is used for verifying the authenticity of the heat pump water heater with the risk of dry combustion according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters under the condition that the heat pump water heater has the risk of suspected dry combustion; And the safety protection module is used for controlling the heat pump water heater to execute the dry-heating protection operation under the condition that the authenticity verification of the dry-heating risk of the heat pump water heater is passed.
9. A heat pump water heater, the heat pump water heater comprising: a memory for storing executable program code; A processor for calling and running the executable program code from the memory, so that the heat pump water heater executes the heat pump water heater dry heating prevention control method according to any one of claims 1 to 7.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program which, when executed, implements the heat pump water heater dry-fire prevention control method according to any one of claims 1 to 7.

Description

Dry heating prevention control method and device for heat pump water heater, heat pump water heater and medium Technical Field The application relates to the technical field of heat pump water heaters, and in particular relates to a dry heating prevention control method and device for a heat pump water heater, the heat pump water heater and a computer readable storage medium in the technical field of heat pump water heaters. Background The heat pump water heater is powered on to run in a water-free or water-deficient state, so that dry heating is easy to occur, and the compressor is overheated, the system is overpressurized, parts are damaged, and even potential safety hazards are caused. The existing dry-fire detection logic generally judges whether the temperature rise of the water tank temperature exceeds a preset threshold value in a fixed time interval or not, and if the temperature rise exceeds the threshold value, the dry-fire detection logic judges that the water tank temperature is dry-fire and triggers a protection shutdown. The method is simple to implement, but is easy to generate false alarm. For example, when the water in the water tank is insufficient after a user uses a large amount of hot water, the system rapidly injects low-temperature cold water into the water tank, and at this time, the high-temperature gaseous refrigerant in the heat exchanger in the water tank and the newly injected cold water undergo severe heat exchange, which may cause the instantaneous rapid rise (i.e. temperature rise jump) of the temperature of the water tank, so that the system is misjudged as dry burning, thereby triggering unnecessary protection shutdown and affecting the use experience of the user on equipment. Disclosure of Invention The embodiment of the application provides a control method and a device for preventing dry heating of a heat pump water heater, the heat pump water heater and a computer readable storage medium, when the heat pump water heater is initially detected to have suspected dry heating risk, further, the reality of the risk of dry combustion of the heat pump water heater is verified through the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater, so that misjudgment of dry combustion can be effectively avoided, and the accuracy and the reliability of dry combustion detection are remarkably improved. According to the first aspect, the dry-heating prevention control method of the heat pump water heater comprises the steps of judging whether the heat pump water heater has a suspected dry-heating risk according to outdoor environment temperature, upper temperature of a water tank of a water storage tank and lower temperature of the water tank under the condition that the heat pump water heater operates, verifying the authenticity of the dry-heating risk of the heat pump water heater according to actual heat exchange quantity and theoretical heat exchange quantity of the heat pump water heater under the same working condition parameters under the condition that the heat pump water heater has the suspected dry-heating risk, and controlling the heat pump water heater to execute the dry-heating prevention protection operation under the condition that the authenticity verification of the dry-heating risk of the heat pump water heater passes. According to the application, under the condition that the heat pump water heater operates, whether the heat pump water heater has a suspected dry-heating risk or not is judged according to the outdoor environment temperature, the upper temperature of the water tank of the water storage tank and the lower temperature of the water tank, under the condition that the heat pump water heater has the suspected dry-heating risk, the authenticity of the dry-heating risk of the heat pump water heater is verified according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters, under the condition that the authenticity verification of the dry-heating risk of the heat pump water heater passes, the heat pump water heater is controlled to execute the dry-heating protection operation, and by adopting the two-stage judging mechanism, whether the heat pump water heater has the suspected dry-heating risk or not is detected firstly and then whether the dry-heating risk is actually present is verified is effectively avoided, and the accuracy and the reliability of dry-heating detection are remarkably improved. In a possible implementation manner, judging whether the heat pump water heater has a suspected dry burning risk according to the outdoor environment temperature, the upper water tank temperature and the lower water tank temperature of the water storage tank comprises judging whether a target temperature difference is larger than or equal to a temperature difference threshold corresponding to the outdoor environment temperature o