CN117928096A - Control method and device of air source heat pump water heater - Google Patents

Abstract

The present invention discloses a control method and device for an air energy heat pump water heater, the method comprising: obtaining the enabling state of a temperature sensor; determining the equivalent water temperature and the equivalent water temperature detection state of a balancing water tank based on the enabling state of the temperature sensor; determining the equivalent actual water outlet temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state; obtaining the set temperature of a terminal heating device, and performing on/off control of an outdoor unit based on the equivalent actual water outlet temperature and the set temperature of the balancing water tank. When the equivalent water temperature detection state of the balancing water tank fails, the present invention can still calculate the equivalent actual water outlet temperature of the balancing water tank, and then use the equivalent actual water outlet temperature of the balancing water tank as a key parameter for the constant terminal device heating demand, so that the system can still work normally when the key temperature sensor fails, thereby ensuring the user's use needs and improving the user experience.

Description

A control method and device for air energy heat pump water heater

Technical Field

The present invention relates to the technical field of air conditioning, and in particular to a control method and device for an air energy heat pump water heater.

Background technique

Air-energy heat pump water heaters usually include air conditioners, water modules, floor heating and heat exchangers. With the increasing popularity of air-energy heat pump water heaters, more and more users use air-energy heat pump water heaters as the main equipment for home heating. In order to ensure the stability of the outlet water temperature of the heat pump water heater, a balancing water tank is usually installed between the hot water outlet of the water module and the heating equipment. The actual outlet water temperature of the balancing water tank can better reflect the actual inlet water temperature of the terminal heating equipment, so that the heating demand of each terminal heating equipment can be allocated according to the actual outlet water temperature of the balancing water tank. However, in actual use, when a key temperature sensor in the air-energy heat pump water heater fails, it is easy to cause the system to fail to work properly. For example, when the sensor for detecting water temperature in the balancing water tank fails, the actual outlet water temperature of the balancing water tank cannot be detected, and the heating demand distribution of the terminal heating equipment cannot be constant, and the emergency use needs of users cannot be met, which reduces the user experience.

Summary of the invention

To solve the above problems, the present invention provides a control method and device for an air-source heat pump water heater, which can use the equivalent actual water outlet temperature of the balancing water tank as the key parameter for the constant terminal equipment heating demand, so that the system can still work normally when the key temperature sensor fails, thereby ensuring the user's usage needs and improving the user experience.

According to an embodiment of the present invention, on the one hand, a control method of an air energy heat pump water heater is provided, wherein the air energy heat pump water heater comprises an outdoor unit, a plurality of terminal heating devices and a balancing water tank, wherein the balancing water tank is arranged between the outdoor unit and the terminal heating devices, and a temperature sensor is arranged in the balancing water tank, and the control method of the air energy heat pump water heater comprises:

Acquire the enabling state of the temperature sensor; wherein the enabling state includes an enabling state and a disabling state;

Determine the equivalent water temperature and equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor; wherein the equivalent water temperature detection state includes a fault state and a normal state;

Determining the equivalent actual water outlet temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state;

The set temperature of the terminal heating equipment is obtained, and the start and stop control of the outdoor unit is performed based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature.

By adopting the above technical scheme, a temperature sensor is set in the balancing water tank, and the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank are determined according to the enabled state of the temperature sensor, and the equivalent actual water outlet temperature of the balancing water tank is determined according to the enabled state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state. When the equivalent water temperature detection state of the balancing water tank fails, the equivalent actual water outlet temperature of the balancing water tank can still be calculated, and then the equivalent actual water outlet temperature of the balancing water tank can be used as the key parameter of the constant terminal equipment heating demand, so that the system can still work normally when the key temperature sensor fails, ensuring the user's usage needs and improving the user experience.

Preferably, a first temperature sensor is provided at the upper part of the balancing water tank, and a second temperature sensor is provided at the lower part of the balancing water tank. The step of determining the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor comprises:

When the enabling state of the first temperature sensor is the enabling state, and the enabling state of the second temperature sensor is the disabling state, the first water temperature detected by the first temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the first temperature sensor is used as the equivalent water temperature detection state; wherein the current state includes a fault state and a normal state;

When the enabling state of the first temperature sensor is the disabling state, and the enabling state of the second temperature sensor is the enabling state, the second water temperature detected by the second temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the second temperature sensor is used as the current state of the water temperature detection sensor;

When the enabling states of the first temperature sensor and the second temperature sensor are both in the enabled state, the current states of the first temperature sensor and the second temperature sensor are obtained, and the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank are determined based on the current states of the first temperature sensor and the second temperature sensor.

By adopting the above technical solution, the equivalent temperature of the balancing water tank is determined according to the enabling status of the temperature sensor, and the temperature sensor can be flexibly configured in the balancing water tank, so as to quickly and accurately detect the equivalent temperature of the balancing water tank, thereby improving the convenience and flexibility of the equivalent temperature detection of the balancing water tank.

Preferably, the air energy heat pump water heater further comprises a water module, and the water module is arranged between the outdoor unit and the balancing water tank. The step of determining the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the current states of the first temperature sensor and the second temperature sensor comprises:

When the current states of the first temperature sensor and the second temperature sensor are both in a fault state, taking the first water temperature detected by the first temperature sensor as the equivalent water temperature of the balancing water tank, and determining that the equivalent water temperature detection state is a fault state;

When the current state of the first temperature sensor is a normal state, and the current state of the second temperature sensor is a fault state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the first water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the first water temperature and the return water temperature detected by the return water temperature sensor is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state;

When the current state of the first temperature sensor is a fault state, and the current state of the second temperature sensor is a normal state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state;

When the current states of the first temperature sensor and the second temperature sensor are both normal, the average value of the first water temperature and the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be normal.

By adopting the above technical solution, it is determined whether the first temperature sensor and the second temperature sensor are in a faulty state, and when the temperature sensor fails, the temperature detection value that best meets the balancing water tank is selected as the equivalent water temperature of the balancing water tank. When the key temperature sensor of the balancing water tank fails, the equivalent temperature of the balancing water tank can still be estimated, so that the unit can still work normally, maximize the user's emergency use needs, and reduce user use troubles caused by untimely maintenance of temperature sensors.

Preferably, the step of determining the equivalent actual outlet water temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state comprises:

When the enabling states of the first temperature sensor and the second temperature sensor are both in the disabled state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

When the enabling state of the first temperature sensor or the second temperature sensor is in the enabled state, determining whether to enter the winter antifreeze mode, and if so, determining whether the equivalent water temperature detection state of the balancing water tank is in a fault state;

When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a fault state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a normal state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

When the equivalent water temperature detection state of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual outlet water temperature.

By adopting the above technical scheme, the equivalent actual water outlet temperature of the balancing water tank is determined according to the equivalent water temperature detection status of the balancing water tank and the current status of the return water temperature sensor. The equivalent actual water outlet temperature of the balancing water tank is estimated based on the temperature sensor detection in the normal detection state, which improves the detection accuracy of the equivalent actual water outlet temperature of the balancing water tank, thereby improving the reliability of the heating demand distribution of the terminal heating equipment.

Preferably, the control method of the air energy heat pump water heater further includes:

When the winter antifreeze mode is not entered, if the equivalent water temperature detection state of the balancing water tank is a fault state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

If the equivalent water temperature detection state of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual outlet water temperature.

By adopting the above technical solution, the terminal heating equipment includes floor heating, and the water inlet pipe between the floor heating and the balancing water tank is provided with a floor heating water pump, a control valve and a floor heating water inlet temperature sensor, and the control method of the air energy heat pump water heater also includes:

When only the floor heating is controlled to be turned on, and the enabling state of the floor heating inlet water temperature sensor is in the enabled state, the floor heating water pump is turned on to obtain the floor heating inlet water temperature detected by the floor heating inlet water temperature sensor;

The operation mode of the control valve is switched based on the floor heating inlet water temperature and the floor heating set temperature; wherein the operation mode of the control valve includes a water mixing mode and a heating mode.

Preferably, when the floor heating mode is turned on, the operation mode of the control valve is switched according to the floor heating inlet water temperature and the floor heating set temperature to adjust the water temperature entering the floor heating, ensure that the floor heating water temperature meets the user's heating needs, and improve the user experience.

By adopting the above technical solution, a return pipe is further connected between the floor heating and the balancing water tank, and the step of switching the operation mode of the control valve based on the floor heating inlet water temperature and the floor heating set temperature includes:

When the floor heating inlet water temperature is greater than a first preset temperature, the control valve is controlled to switch to the water mixing mode so that the low-temperature water in the return pipe enters the water inlet pipe; wherein the first preset temperature is the sum of the floor heating set temperature and the floor heating startup return temperature;

When the floor heating inlet water temperature is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is controlled to periodically switch between the water mixing mode and the heating mode; wherein the second preset temperature is the sum of the floor heating set temperature and the floor heating shutdown return temperature;

When the floor heating inlet water temperature is lower than the second preset temperature, the control valve is controlled to switch to the heating mode so that the hot water in the water inlet pipe enters the floor heating pipe.

Preferably, the control valve is switched according to the relationship between the floor heating inlet water temperature and the floor heating set temperature to increase or decrease the inlet water temperature entering the floor heating, so that the floor heating inlet water temperature is maintained near the floor heating set temperature, thereby meeting the user's floor heating heating needs and improving the user's comfort.

Preferably, the terminal heating equipment includes floor heating, an indoor unit and a heat exchanger; the step of controlling the start and stop of the outdoor unit based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature includes:

When the equivalent actual water outlet temperature of the balancing water tank is lower than the set temperature, the outdoor unit and the water module are controlled to start and operate, so as to increase the equivalent actual water outlet temperature of the balancing water tank;

When the equivalent actual water outlet temperature of the balancing water tank is greater than the set temperature, the outdoor unit and the water module are controlled to stop running to reduce the equivalent actual water outlet temperature of the balancing water tank.

By adopting the above technical scheme, the opening and closing of the outdoor unit and the water module are controlled according to the relationship between the equivalent actual water outlet temperature of the balancing water tank and the set temperature of the terminal heating equipment, so that the water temperature heat exchange speed of the unit is controlled according to the heating demand of the terminal heating equipment, and the reliability of the unit's heating control is improved.

According to an embodiment of the present invention, on the other hand, a control device for an air energy heat pump water heater is provided, the air energy heat pump water heater comprises an outdoor unit, a plurality of terminal heating devices and a balancing water tank, the balancing water tank is arranged between the outdoor unit and the terminal heating devices, a temperature sensor is arranged in the balancing water tank, and the control device for the air energy heat pump water heater comprises:

An acquisition module, used for acquiring an enabling state of the temperature sensor; wherein the enabling state includes an enabled state and a disabled state;

A first determination module, configured to determine the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor; wherein the equivalent water temperature detection state includes a fault state and a normal state;

A second determination module, configured to determine an equivalent actual outlet water temperature of the balancing water tank based on an enabling state of the temperature sensor, an equivalent water temperature of the balancing water tank, and an equivalent water temperature detection state;

The control module is used to obtain the set temperature of the terminal heating equipment and to control the start and stop of the outdoor unit based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature.

According to an embodiment of the present invention, on the other hand, an air energy heat pump water heater is provided, comprising: an outdoor unit, a water module, a plurality of terminal heating devices, a balancing water tank and a controller, wherein the balancing water tank is arranged between the outdoor unit and the terminal heating device, the water module is arranged between the outdoor unit and the balancing water tank, and a temperature sensor is arranged in the balancing water tank;

The controller includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the method according to any one of the first aspects is implemented.

The present invention has the following beneficial effects: by arranging a temperature sensor in the balancing water tank, the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank are determined according to the enabling state of the temperature sensor, and the equivalent actual water outlet temperature of the balancing water tank is determined according to the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state; when the equivalent water temperature detection state of the balancing water tank fails, the equivalent actual water outlet temperature of the balancing water tank can still be calculated, and then the equivalent actual water outlet temperature of the balancing water tank can be used as a key parameter for the constant terminal equipment heating demand, so that the system can still work normally when the key temperature sensor fails, thereby ensuring the user's usage needs and improving the user experience.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

FIG1 is a schematic structural diagram of an air energy heat pump water heater provided by the present invention;

FIG2 is a flow chart of a control method of an air energy heat pump water heater provided by the present invention;

FIG3 is a schematic diagram of water circulation in a floor heating mixed water mode provided by the present invention;

FIG4 is a schematic diagram of water circulation in a floor heating mode provided by the present invention;

FIG. 5 is a schematic structural diagram of a control device of an air energy heat pump water heater provided by the present invention.

Detailed ways

The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The present embodiment provides an air energy heat pump water heater, referring to the structural schematic diagram of the air energy heat pump water heater as shown in FIG1 , the air energy heat pump water heater comprises: an outdoor unit 11, a water module 12, a plurality of terminal heating devices, a balancing water tank 13 and a controller (not shown in the figure), the balancing water tank 13 is arranged between the outdoor unit 11 and the terminal heating device, the water module 12 is arranged between the outdoor unit 11 and the balancing water tank 13, and a temperature sensor is arranged in the balancing water tank 13.

The above-mentioned water module 12 is used to exchange heat between the water in the unit pipeline and the refrigerant entering the water module 12 from the outdoor unit 11 to increase the water temperature. The heated water enters the water outlet pipeline through the main water outlet valve 121 of the water module 12, and then enters each terminal heating equipment after passing through the balancing water tank 13.

As shown in Figure 1, the dark gray pipe in Figure 1 is the outlet pipe of the water module 12 (that is, the water inlet pipe of each terminal heating device), and the light gray pipe in Figure 1 is the return pipe of the water module, that is, the return water after heat dissipation in each terminal heating device. The water in the return pipe passes through the return water main valve 122 of the water module 12 and then enters the water module to exchange heat with the refrigerant to absorb the heat of the refrigerant.

As shown in FIG1 , a circulating water pump P1 is provided in the water module 12 to fully circulate the water in the pipe. A drain valve 123 is also provided on the outlet pipe of the water module 12, and a water replenishment valve 124 is provided on the return pipe. Taking the example of two temperature sensors provided in the balancing water tank, a first temperature sensor BT1 is provided on the upper part of the balancing water tank 13, and a second temperature sensor BT2 is provided on the lower part.

The above-mentioned terminal heating equipment includes an indoor unit 14, a heat exchange plate 15 and a floor heating 16. The air-source heat pump water heater provided in this embodiment may also include a hot water tank 17. The water in the hot water tank 17 can be heated using a solar panel, and can also enter the water module 12 to exchange heat with the refrigerant and store the user's domestic water.

As shown in FIG1 , an external circulation pump P2 is provided on the connecting pipe of the hot water tank 17 , and a floor heating water pump P3 , a control valve MV2 and a floor heating water inlet temperature sensor FLH are provided on the water inlet pipe between the floor heating and the balancing water tank.

This embodiment provides a control method for an air energy heat pump water heater, which can be applied to the air energy heat pump water heater provided in the above embodiment. Referring to the control method flow chart of the air energy heat pump water heater shown in FIG. 2 , the method mainly includes the following steps S202 to S208:

Step S202: obtaining the enabling status of the temperature sensor;

The enabling state of the temperature sensor includes an enabled state and a disabled state, that is, whether the temperature detection value of the temperature sensor will be used in the control process. The above-mentioned temperature sensor can detect the water temperature in the balancing water tank in both the enabled state and the disabled state.

Step S204: determining the equivalent water temperature and equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor;

The above-mentioned equivalent water temperature detection state includes a fault state and a normal state; the equivalent water temperature detection state is related to the current state of the temperature sensor in the balancing water tank. The number of the temperature sensors in the above-mentioned balancing water tank can be one or more. When the temperature sensor in the balancing water tank has an open circuit or a short circuit problem, it is determined that the temperature sensor is in a fault state.

When there is a temperature sensor in the balancing water tank that is not in a faulty state (i.e., in a normal state), the equivalent water temperature of the balancing water tank can be detected normally, and the equivalent water temperature detection state of the balancing water tank is determined to be a normal state. The equivalent water temperature of the balancing water tank is determined based on the water temperature detected by the temperature sensor in the normal state.

Step S206: determining the equivalent actual outlet water temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state;

When the enabling state of the temperature sensor is enabled, the equivalent actual water outlet temperature of the balancing water tank is determined according to the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state. The equivalent actual water outlet temperature can reflect the inlet water temperature of each terminal heating equipment, thereby the heating demand of the terminal heating equipment can be constant.

When the enabling state of the temperature sensor is not enabled, it is necessary to determine the equivalent actual outlet water temperature of the balancing water tank according to the water temperature detected by other temperature sensors, such as the inlet water temperature or the return water temperature of the water module.

Step S208: Obtain the set temperature of the terminal heating equipment, and control the start and stop of the terminal heating equipment based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature.

The terminal heating equipment may include the indoor unit of the air conditioner, the heat exchanger (i.e., radiator) and floor heating. The set temperature may be the water temperature required by each terminal heating equipment to achieve indoor heating. The set temperature of each terminal heating equipment may be the same or different. Since the equivalent actual water outlet temperature of the above-mentioned balancing water tank is approximately the actual water temperature entering the indoor unit and the heat exchanger, the relationship between the equivalent actual water outlet temperature and the set temperature of the indoor unit and the heat exchanger is determined. When the equivalent actual water outlet temperature is lower than the set temperature, that is, the water temperature entering the terminal heating equipment is low and does not meet the heating demand, it is necessary to increase the equivalent actual water outlet temperature of the balancing water tank, and control the outdoor unit to start up and run, so as to increase the heat exchange rate of the water temperature in the system and increase the equivalent actual water outlet temperature of the balancing water tank.

In a specific embodiment, the terminal heating equipment includes floor heating, an indoor unit and a heat exchanger; when the equivalent actual water outlet temperature of the balancing water tank is lower than the set temperature, the outdoor unit and the water module are controlled to start and operate to increase the equivalent actual water outlet temperature of the balancing water tank; when the equivalent actual water outlet temperature of the balancing water tank is higher than the set temperature, the outdoor unit and the water module are controlled to stop operating to reduce the equivalent actual water outlet temperature of the balancing water tank.

By controlling the opening and closing of the outdoor unit and the water module according to the relationship between the equivalent actual water outlet temperature of the balancing water tank and the set temperature of the terminal heating equipment, the water temperature heat exchange speed of the unit is controlled according to the heating demand of the terminal heating equipment, thereby improving the reliability of the unit's heating control.

The control method of the above-mentioned air-source heat pump water heater provided in the present embodiment sets a temperature sensor in the balancing water tank, determines the equivalent water temperature and the equivalent water temperature detection status of the balancing water tank according to the enabled state of the temperature sensor, and determines the equivalent actual water outlet temperature of the balancing water tank according to the enabled state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection status. When the equivalent water temperature detection state of the balancing water tank fails, the equivalent actual water outlet temperature of the balancing water tank can still be calculated, and then the equivalent actual water outlet temperature of the balancing water tank can be used as the key parameter of the constant terminal equipment heating demand, so that the system can still work normally when the key temperature sensor fails, thereby ensuring the user's usage needs and improving the user experience.

In one embodiment, a first temperature sensor BT1 is provided at the upper part of the above-mentioned balancing water tank, and a second temperature sensor BT2 is provided at the lower part of the balancing water tank. This embodiment provides an implementation method for determining the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor, which can be specifically performed with reference to the following steps:

Step (1): when the enabling state of the first temperature sensor is the enabling state, and the enabling state of the second temperature sensor is the disabling state, the first water temperature detected by the first temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the first temperature sensor is used as the equivalent water temperature detection state;

The first temperature sensor can detect the upper water temperature of the balancing water tank, and the second temperature sensor can detect the lower water temperature of the balancing water tank. The enabling state of the first temperature sensor and the second temperature sensor can be set by the user, that is, whether to use the temperature value detected by the temperature sensor for subsequent control.

The equivalent water temperature TWT_BT of the above-mentioned balancing water tank can also be called the reduced water temperature of the balancing water tank (i.e., the water temperature after the upper and lower parts of the balancing water tank are combined). When the enabling state of the first temperature sensor is enabled and the enabling state of the second temperature sensor is disabled, the first water temperature TWT_BT1 detected by the first temperature sensor is assigned to the equivalent water temperature of the balancing water tank, that is, TWT_BT=TWT_BT1. The current state of the first temperature sensor is the equivalent water temperature detection state of the balancing water tank, which includes a fault state (including an open circuit and a short circuit) and a normal state.

Step (2): when the enabling state of the first temperature sensor is the disabled state and the enabling state of the second temperature sensor is the enabled state, the second water temperature detected by the second temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the second temperature sensor is used as the current state of the water temperature detection sensor;

When the enable state of the first temperature sensor is not enabled and the enable state of the second temperature sensor is enabled, since the first temperature sensor is not enabled, the second water temperature TWT_BT2 detected by the second temperature sensor is assigned the equivalent water temperature of the balancing water tank, that is, TWT_BT=TWT_BT2, and the current state of the second temperature sensor is the equivalent water temperature detection state of the balancing water tank.

In one embodiment, when the enabling state of the first temperature sensor is not enabled and the enabling state of the second temperature sensor is not enabled, let TWT_BT=TWT_BT1, and use the current state of the first temperature sensor as the equivalent water temperature detection state of the balancing water tank. Since the enabling states of the first temperature sensor and the second temperature sensor are both not enabled, the equivalent water temperature of the balancing water tank obtained here is not used later.

Step (3): When the enabling states of the first temperature sensor and the second temperature sensor are both enabled, obtain the current states of the first temperature sensor and the second temperature sensor, and determine the equivalent water temperature and equivalent water temperature detection state of the balancing water tank based on the current states of the first temperature sensor and the second temperature sensor.

When the first temperature sensor and the second temperature sensor are both in the enabled state, the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank need to be determined according to the fault state of the first temperature sensor and the second temperature sensor. By determining the equivalent temperature of the balancing water tank according to the enabled state of the temperature sensor, the temperature sensor can be flexibly configured in the balancing water tank, so as to quickly and accurately detect the equivalent temperature of the balancing water tank, thereby improving the convenience and flexibility of the equivalent temperature detection of the balancing water tank.

In a specific implementation, when the current states of the first temperature sensor and the second temperature sensor are both in a fault state, the first water temperature detected by the first temperature sensor is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a fault state;

When the current states of the first temperature sensor and the second temperature sensor are both in a fault state, TWT_BT=TWT_BT1, and the current state of the first temperature sensor is used as the equivalent water temperature detection state of the balancing water tank, that is, the equivalent water temperature detection state of the balancing water tank is a fault state, so as to prompt the user to perform maintenance in time.

When the current state of the first temperature sensor is a normal state, and the current state of the second temperature sensor is a fault state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the first water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the first water temperature and the return water temperature TWI detected by the return water temperature sensor is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state;

The return water temperature sensor is arranged at the return water pipe inlet of the water module. If the first temperature sensor is in normal state, the second temperature sensor is in fault state, and the return water temperature sensor is in fault state, TWT_BT＝TWT_BT1, and the current state of the first temperature sensor is used as the equivalent water temperature detection state of the balancing water tank, that is, the equivalent water temperature detection state of the balancing water tank is normal.

If the first temperature sensor is in a normal state, the second temperature sensor is in a fault state, and the return water temperature sensor is in a normal state, TWT_BT＝(TWT_BT1+TWI)/2, it is determined that the equivalent water temperature detection state is a normal state.

When the current state of the first temperature sensor is a fault state, and the current state of the second temperature sensor is a normal state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state;

If the current state of the first temperature sensor is a fault state, the current state of the second temperature sensor is a normal state, and the return water temperature sensor is in a fault state, TWT_BT=TWT_BT2, and the current state of the second temperature sensor is used as the equivalent water temperature detection state of the balancing water tank, that is, the equivalent water temperature detection state of the balancing water tank is a normal state.

If the current state of the first temperature sensor is a fault state, the current state of the second temperature sensor is a normal state, and the return water temperature sensor is a normal state, TWT_BT=(TWT_BT2+TWI)/2, it is determined that the equivalent water temperature detection state is a normal state.

When the current states of the first temperature sensor and the second temperature sensor are both normal, the average value of the first water temperature and the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be normal.

If the current states of the first temperature sensor and the second temperature sensor are both normal, TWT_BT=(TWT_BT1+TWT_BT2)/2, it is determined that the equivalent water temperature detection state is normal.

By judging whether the first temperature sensor and the second temperature sensor are in a faulty state, and selecting the temperature detection value that best matches the balancing water tank as the equivalent water temperature of the balancing water tank when the temperature sensor fails, the equivalent temperature of the balancing water tank can still be estimated when the key temperature sensor of the balancing water tank fails, so that the unit can still work normally, maximizing the user's emergency use needs and reducing user use troubles caused by untimely maintenance of temperature sensors.

In one embodiment, this embodiment provides an implementation method for determining the equivalent actual outlet water temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state. Specifically, the implementation can refer to the following steps:

Step 1): when the enabling states of the first temperature sensor and the second temperature sensor are both in the disabled state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

If both the first temperature sensor and the second temperature sensor are not enabled, the water temperature detected by the first temperature sensor and the second temperature sensor is not used. An outlet water temperature sensor is provided at the water outlet of the water module. Since the hot water outlet of the water module is connected to the water inlet of the balancing water tank, the outlet water temperature of the water module is close to the temperature of the balancing water tank, so the equivalent actual outlet water temperature of the balancing water tank can be made equal to the outlet water temperature detected by the outlet water temperature sensor of the water module.

Step 2): When the enabling state of the first temperature sensor or the second temperature sensor is enabled, determine whether to enter the winter antifreeze mode, and if so, determine whether the equivalent water temperature detection state of the balancing water tank is a fault state;

If the first temperature sensor or the second temperature sensor is enabled, determine whether to enter the winter antifreeze mode. When the unit is shut down and the outdoor ambient temperature is lower than the preset temperature, there is a risk of pipe freezing, and it is determined to enter the winter antifreeze mode.

When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a fault state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a normal state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual outlet water temperature;

When the equivalent water temperature detection state of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual water outlet temperature.

By determining the equivalent actual water outlet temperature of the balancing water tank based on the equivalent water temperature detection status of the balancing water tank and the current status of the return water temperature sensor, and estimating the equivalent actual water outlet temperature of the balancing water tank based on the temperature sensor detection in the normal detection state, the detection accuracy of the equivalent actual water outlet temperature of the balancing water tank is improved, thereby improving the reliability of the heating demand distribution of the terminal heating equipment.

Step 3): When the winter antifreeze mode is not entered, if the equivalent water temperature detection status of the balancing water tank is a fault state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual water outlet temperature; if the equivalent water temperature detection status of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual water outlet temperature.

When the unit is turned on or off, and the outdoor ambient temperature is higher than the preset temperature, there is no risk of pipe freezing, and it is determined that the winter antifreeze mode has not been entered. The equivalent water temperature closest to the overall water temperature of the balancing water tank is determined based on the equivalent water temperature detection status of the balancing water tank, which improves the detection accuracy of the equivalent actual water outlet temperature of the balancing water tank.

Considering the large inertia of water in the unit, during the water temperature collection process, it is necessary to start the circulating water pump to allow the water in the unit to circulate fully, to ensure that there is no dead water or that the water in each terminal area is not fully mixed, so as to improve the accuracy of the temperature sensor in detecting the water temperature.

In one embodiment, the method provided in this embodiment further includes:

When only the floor heating is controlled to be turned on, and the enabling state of the floor heating inlet water temperature sensor is enabled, the floor heating water pump is turned on to obtain the floor heating inlet water temperature detected by the floor heating inlet water temperature sensor; the operating mode of the control valve is switched based on the floor heating inlet water temperature and the floor heating set temperature; wherein, the operating modes of the control valve include mixing mode and heating mode.

When the terminal heating equipment is turned on and off, if only the floor heating mode is turned on, the floor heating water pump is turned on, and the control valve at the entrance of the floor heating pipe is controlled according to the floor heating inlet water temperature and the floor heating set temperature, so that the floor heating is switched to the corresponding mode. When the floor heating mode is turned on, the operation mode of the control valve is switched according to the floor heating inlet water temperature and the floor heating set temperature to adjust the water temperature entering the floor heating, ensure that the floor heating water temperature meets the user's heating needs, and improve the user experience.

In one embodiment, when the floor heating mode is turned off, or when the floor heating mode is turned on and the enabling state of the floor heating inlet water temperature sensor is not enabled, the control valve at the inlet of the floor heating pipe is closed.

In one embodiment, this embodiment provides a specific implementation method for switching the operation mode of the control valve based on the floor heating inlet water temperature and the floor heating set temperature:

When the inlet water temperature of the floor heating is greater than the first preset temperature, the control valve is switched to the water mixing mode to allow the low-temperature water in the return pipe to enter the inlet pipe; wherein the first preset temperature is the sum of the floor heating set temperature and the floor heating startup return temperature (the value range can be 1 to 3 degrees);

When the floor heating inlet water temperature is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is controlled to periodically switch between the mixing mode and the heating mode; wherein the second preset temperature is the sum of the floor heating set temperature and the floor heating shutdown return temperature (the value range can be 1 to 3 degrees);

When the floor heating inlet water temperature is lower than the second preset temperature, the control valve is controlled to switch to the heating mode so that the hot water in the water inlet pipe enters the floor heating pipe.

When the floor heating inlet water temperature is greater than the first preset temperature, that is, the floor heating inlet water temperature is high, it is necessary to lower the floor heating inlet water temperature. Referring to the water circulation diagram under the floor heating mixed water mode as shown in FIG3 , the water entering the floor heating will circulate with the water in the return water pipe. Since the water in the return water pipe cools down in the floor heating pipe, the temperature of the floor heating inlet water can be lowered by mixing the water in the return water pipe into the floor heating inlet water pipe, so that the floor heating inlet water temperature is close to the floor heating set temperature.

When the floor heating inlet water temperature is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the floor heating inlet water temperature is moderate. In order to maintain the floor heating inlet water temperature, the floor heating control valve is controlled to switch to the mixing water mode and run for the first preset time (the value range can be 1 to 3 minutes, preferably 3 minutes), and then the floor heating control valve is controlled to switch to the heating mode and run for the second preset time (the value range can be 1 to 3 minutes, preferably 3 minutes), and the cycle is repeated in sequence. The above-mentioned first preset time and the second preset time can be equal or different.

When the floor heating inlet water temperature is lower than the second preset temperature, that is, the floor heating inlet water temperature is low, it is necessary to increase the floor heating inlet water temperature. Referring to the water circulation diagram under the floor heating heating mode as shown in FIG4 , the heated water is input into the floor heating pipe to increase the floor heating inlet water temperature so that the floor heating inlet water temperature is close to the floor heating set temperature.

By switching the control valve according to the relationship between the floor heating inlet water temperature and the floor heating set temperature, the inlet water temperature entering the floor heating can be increased or decreased, so that the floor heating inlet water temperature is maintained near the floor heating set temperature, thereby meeting the user's floor heating heating needs and improving the user's comfort.

The control method of the air-source heat pump water heater provided in this embodiment improves the user's convenience and comfort requirements through the flexible configuration of water temperature sensors; through the temperature sensor acquisition algorithm, after the water temperature sensor at an important position fails, the unit can still work normally, thereby maximizing the user's emergency use needs and reducing the user's use troubles caused by untimely maintenance.

Corresponding to the control method of the air energy heat pump water heater provided in the above embodiment, an embodiment of the present invention provides a control device for an air energy heat pump water heater, which can be applied to the air energy heat pump water heater provided in the above embodiment. Referring to the structural schematic diagram of the control device for the air energy heat pump water heater as shown in FIG5 , the device includes the following modules:

The acquisition module 51 is used to acquire the enabling state of the temperature sensor; wherein the enabling state includes an enabled state and a disabled state;

A first determination module 52 is used to determine the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor; wherein the equivalent water temperature detection state includes a fault state and a normal state;

A second determination module 53, configured to determine an equivalent actual outlet water temperature of the balancing water tank based on an enabling state of the temperature sensor, an equivalent water temperature of the balancing water tank, and an equivalent water temperature detection state;

The control module 54 is used to obtain the set temperature of the terminal heating equipment and control the start and stop of the outdoor unit based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature.

The control device of the above-mentioned air-source heat pump water heater provided in the present embodiment sets a temperature sensor in the balancing water tank, determines the equivalent water temperature and the equivalent water temperature detection status of the balancing water tank according to the enabled state of the temperature sensor, and determines the equivalent actual water outlet temperature of the balancing water tank according to the enabled state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection status. When the equivalent water temperature detection state of the balancing water tank fails, the equivalent actual water outlet temperature of the balancing water tank can still be calculated, and then the equivalent actual water outlet temperature of the balancing water tank can be used as the key parameter of the constant terminal device heating demand, so that the system can still work normally when the key temperature sensor fails, thereby ensuring the user's usage needs and improving the user experience.

Corresponding to the control method of the air-source heat pump water heater provided in the above embodiment, this embodiment provides an air-source heat pump water heater, which includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the control method of the air-source heat pump water heater provided in the above embodiment is implemented.

This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, each process of the control method of the air-energy heat pump water heater described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

Of course, those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the control device through a computer, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. As for the control method of the air-energy heat pump water heater and the air-energy heat pump water heater disclosed in the embodiment, since they correspond to the control method of the air-energy heat pump water heater disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims (10)

1. A control method for an air-energy heat pump water heater, characterized in that the air-energy heat pump water heater comprises an outdoor unit, a plurality of terminal heating devices and a balancing water tank, wherein the balancing water tank is arranged between the outdoor unit and the terminal heating devices, and a temperature sensor is arranged in the balancing water tank, and the control method for the air-energy heat pump water heater comprises: Acquire the enabling state of the temperature sensor; wherein the enabling state includes an enabling state and a disabling state; Determine the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabled state of the temperature sensor; wherein the equivalent water temperature detection state includes a fault state and a normal state; determine the equivalent actual water outlet temperature of the balancing water tank based on the enabled state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state; The set temperature of the terminal heating equipment is obtained, and the start and stop control of the outdoor unit is performed based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature. 2. The control method of the air energy heat pump water heater according to claim 1, characterized in that a first temperature sensor is provided on the upper part of the balancing water tank, and a second temperature sensor is provided on the lower part of the balancing water tank, and the step of determining the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor comprises: When the enabling state of the first temperature sensor is the enabling state, and the enabling state of the second temperature sensor is the disabling state, the first water temperature detected by the first temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the first temperature sensor is used as the equivalent water temperature detection state; wherein the current state includes a fault state and a normal state; When the enabling state of the first temperature sensor is the disabling state, and the enabling state of the second temperature sensor is the enabling state, the second water temperature detected by the second temperature sensor is used as the equivalent water temperature of the balancing water tank, and the current state of the second temperature sensor is used as the current state of the water temperature detection sensor; When the enabling states of the first temperature sensor and the second temperature sensor are both in the enabled state, the current states of the first temperature sensor and the second temperature sensor are obtained, and the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank are determined based on the current states of the first temperature sensor and the second temperature sensor. 3. The control method of the air energy heat pump water heater according to claim 2, characterized in that the air energy heat pump water heater further comprises a water module, the water module is arranged between the outdoor unit and the balancing water tank, and the step of determining the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the current state of the first temperature sensor and the second temperature sensor comprises: When the current states of the first temperature sensor and the second temperature sensor are both in a fault state, taking the first water temperature detected by the first temperature sensor as the equivalent water temperature of the balancing water tank, and determining that the equivalent water temperature detection state is a fault state; When the current state of the first temperature sensor is a normal state, and the current state of the second temperature sensor is a fault state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the first water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the first water temperature and the return water temperature detected by the return water temperature sensor is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; When the current state of the first temperature sensor is a fault state, and the current state of the second temperature sensor is a normal state, the current state of the return water temperature sensor of the water module is obtained; if the current state of the return water temperature sensor is a fault state, the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; if the current state of the return water temperature sensor is a normal state, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be a normal state; When the current states of the first temperature sensor and the second temperature sensor are both normal, the average value of the first water temperature and the second water temperature is used as the equivalent water temperature of the balancing water tank, and the equivalent water temperature detection state is determined to be normal. 4. The control method of the air energy heat pump water heater according to claim 3, characterized in that the step of determining the equivalent actual outlet water temperature of the balancing water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balancing water tank and the equivalent water temperature detection state comprises: When the enabling states of the first temperature sensor and the second temperature sensor are both in the disabled state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature; When the enabling state of the first temperature sensor or the second temperature sensor is in the enabled state, determining whether to enter the winter antifreeze mode, and if so, determining whether the equivalent water temperature detection state of the balancing water tank is in a fault state; When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a fault state, the outlet water temperature detected by the outlet water temperature sensor of the water module is used as the equivalent actual outlet water temperature; When the equivalent water temperature detection state of the balancing water tank is a fault state, and the current state of the return water temperature sensor is a normal state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual outlet water temperature; When the equivalent water temperature detection state of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual outlet water temperature. 5. The control method of the air energy heat pump water heater according to claim 4, characterized in that it also includes: When the winter antifreeze mode is not entered, if the equivalent water temperature detection state of the balancing water tank is a fault state, the return water temperature detected by the return water temperature sensor of the water module is used as the equivalent actual outlet water temperature; If the equivalent water temperature detection state of the balancing water tank is normal, the equivalent water temperature of the balancing water tank is used as the equivalent actual outlet water temperature. 6. The control method of the air-energy heat pump water heater according to claim 1, characterized in that the terminal heating equipment includes floor heating, and a floor heating water pump, a control valve and a floor heating water inlet temperature sensor are arranged on the water inlet pipe between the floor heating and the balancing water tank, and the control method of the air-energy heat pump water heater further comprises: When only the floor heating is controlled to be turned on, and the enabling state of the floor heating inlet water temperature sensor is in the enabled state, the floor heating water pump is turned on to obtain the floor heating inlet water temperature detected by the floor heating inlet water temperature sensor; Switching the operation mode of the control valve based on the floor heating inlet water temperature and the floor heating set temperature; Wherein, the operation modes of the control valve include a water mixing mode and a heating mode. 7. The control method of the air energy heat pump water heater according to claim 6, characterized in that a return pipe is further connected between the floor heating and the balancing water tank, and the step of switching the operation mode of the control valve based on the floor heating inlet water temperature and the floor heating set temperature comprises: When the floor heating inlet water temperature is greater than a first preset temperature, the control valve is controlled to switch to the water mixing mode so that the low-temperature water in the return pipe enters the water inlet pipe; wherein the first preset temperature is the sum of the floor heating set temperature and the floor heating startup return temperature; When the floor heating inlet water temperature is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is controlled to periodically switch between the water mixing mode and the heating mode; wherein the second preset temperature is the sum of the floor heating set temperature and the floor heating shutdown return temperature; When the floor heating inlet water temperature is lower than the second preset temperature, the control valve is controlled to switch to the heating mode so that the hot water in the water inlet pipe enters the floor heating pipe. 8. The control method of the air energy heat pump water heater according to claim 3, characterized in that the terminal heating equipment includes floor heating, an indoor unit and a heat exchanger; the step of controlling the start and stop of the outdoor unit based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature comprises: When the equivalent actual water outlet temperature of the balancing water tank is lower than the set temperature, the outdoor unit and the water module are controlled to start and operate, so as to increase the equivalent actual water outlet temperature of the balancing water tank; When the equivalent actual water outlet temperature of the balancing water tank is greater than the set temperature, the outdoor unit and the water module are controlled to stop running to reduce the equivalent actual water outlet temperature of the balancing water tank. 9. A control device for an air-energy heat pump water heater, characterized in that the air-energy heat pump water heater comprises an outdoor unit, a plurality of terminal heating devices and a balancing water tank, wherein the balancing water tank is arranged between the outdoor unit and the terminal heating devices, and a temperature sensor is arranged in the balancing water tank, and the control device for the air-energy heat pump water heater comprises: An acquisition module, used for acquiring an enabling state of the temperature sensor; wherein the enabling state includes an enabled state and a disabled state; A first determination module, configured to determine the equivalent water temperature and the equivalent water temperature detection state of the balancing water tank based on the enabling state of the temperature sensor; wherein the equivalent water temperature detection state includes a fault state and a normal state; A second determination module, configured to determine an equivalent actual outlet water temperature of the balancing water tank based on an enabling state of the temperature sensor, an equivalent water temperature of the balancing water tank, and an equivalent water temperature detection state; The control module is used to obtain the set temperature of the terminal heating equipment and to control the start and stop of the outdoor unit based on the equivalent actual water outlet temperature of the balancing water tank and the set temperature. 10. An air energy heat pump water heater, characterized in that it comprises: an outdoor unit, a water module, a plurality of terminal heating devices, a balancing water tank and a controller, wherein the balancing water tank is arranged between the outdoor unit and the terminal heating device, the water module is arranged between the outdoor unit and the balancing water tank, and a temperature sensor is arranged in the balancing water tank; The controller includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the method according to any one of claims 1 to 8 is implemented.