WO2023202103A1

WO2023202103A1 - Defrosting control method and apparatus for heat pump water heater, device, and medium

Info

Publication number: WO2023202103A1
Application number: PCT/CN2022/138747
Authority: WO
Inventors: 梁杰; 王者华; 冯晓赟; 孙强
Original assignee: 青岛经济技术开发区海尔热水器有限公司; 海尔智家股份有限公司
Priority date: 2022-04-18
Filing date: 2022-12-13
Publication date: 2023-10-26
Also published as: CN114963570A

Abstract

The present invention relates to the field of intelligent household appliances, and in particular to a defrosting control method and apparatus for a heat pump water heater, a device, and a medium. The present invention aims at solving the problem of how a novel air source heat pump water heater performs defrosting during a water heating process. According to the defrosting control method and apparatus for a heat pump water heater, the device, and the medium provided by the present invention, when an outdoor heat exchanger needs to be defrosted, different defrosting schemes are determined according to the temperature of a water tank. When the temperature of the water tank is high, a high-temperature and high-pressure refrigerant mostly flows to the outdoor heat exchanger for defrosting; and when the temperature of the water tank is low, the high-temperature and high-pressure refrigerant mostly flows to the water tank to heat water in the water tank. According to the present scheme, defrosting during water heating is implemented by controlling the amount of a refrigerant flowing to an outdoor heat exchanger and a water tank, and the degree of optimization of energy distribution for water heating and defrosting is high.

Description

Defrost control methods, devices, equipment and media for heat pump water heaters

This application requires the priority of the Chinese patent application submitted to the China Patent Office on April 18, 2022, with the application number 202210402159.0 and the application name "Defrost control method, device, equipment and medium for heat pump water heaters", and all its contents have been approved This reference is incorporated into this application.

Technical field

Embodiments of the present invention belong to the field of smart home appliances, and specifically relate to defrost control methods, devices, equipment and media for heat pump water heaters.

Background technique

With the development of science and technology and the improvement of people's living standards, the number and types of household appliances in people's homes are increasing, such as water heaters, air conditioners, refrigerators, washing machines, etc. As for water heaters, they have evolved from the original electric water heaters and gas water heaters to the current air source heat pump water heaters.

In the existing technology, traditional air source heat pump water heaters usually only include hot water heating functions, and indoor cooling and heating are usually undertaken by refrigeration and heating equipment. In this way, not only are the equipment utilization rates of traditional air source heat pump water heaters and refrigeration and heating equipment not high, but also the equipment utilization rate is low. Moreover, it occupies a large installation space, resulting in low space utilization. To this end, a new type of air source heat pump water heater is provided in the related technology. The new type of air source heat pump water heater integrates the functions of hot water heating, cooling and heating, making the air source heat pump water heater have the characteristics of multiple uses in one machine to improve the efficiency of the air source heat pump water heater. While improving equipment utilization, it can also improve space utilization.

However, how the new air source heat pump water heater performs defrosting during the process of heating water remains to be further studied.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of how to defrost a new type of air source heat pump water heater during the process of heating hot water, embodiments of the present invention provide a defrost control method and device for a heat pump water heater. , equipment and media.

In a first aspect, embodiments of the present invention provide a defrost control method for a heat pump water heater, which is applied to a processor in the heat pump water heater. The heat pump water heater includes the processor, a water tank, and a heat pump connected to the processor. Water heat exchanger, electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly; the control valve assembly includes a four-way reversing valve, main control valve, hot water control valve and heating control valve ; The compressor is connected to the outdoor heat exchanger and the indoor heat exchanger respectively through the four-way reversing valve, and the indoor heat exchanger is connected to the heating control valve and the hot water control valve through the heating control valve and the hot water control valve. The hot water heat exchanger is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger passes through the hot water control valve and the main control valve. Communicated with the outdoor heat exchanger, the electric heater is located in the water tank and used to electrically heat the water tank; the method includes:

When it is detected that the preset defrost conditions are met, obtain the temperature of the water tank;

According to the temperature of the water tank and the preset water tank temperature, the working status of each control valve in the compressor, the electric heater and the control valve assembly is controlled.

In the preferred technical solution of the defrost control method of the heat pump water heater, each control valve in the compressor, the electric heater and the control valve assembly is controlled according to the temperature of the water tank and the preset water tank temperature. working status, including:

When the temperature of the water tank is greater than or equal to the preset water tank temperature, the first hot water opening of the hot water control valve, the first control opening of the main control valve, and the heating opening of the heating control valve are determined. degree, the working state of the electric heater, the communication direction of the four-way reversing valve and the operating frequency of the compressor;

Control the hot water control valve to be at the first hot water opening, the main control valve to be at the first control opening, the heating control valve to be at the heating opening, and the electric heater to work at The working state, the four-way reversing valve is switched to the communication direction, and the compressor operates at the operating frequency.

When the temperature of the water tank is less than the preset water tank temperature, obtain the current indoor ambient temperature;

Determine the second hot water opening of the hot water control valve according to the indoor ambient temperature;

Determine the second control opening of the main control valve, the heating opening of the heating control valve, the heating working state of the electric heater, the communication direction of the four-way reversing valve and the operation of the compressor frequency;

Control the hot water control valve to be at the second hot water opening, the main control valve to be at the second control opening, the heating control valve to be at the heating opening, and the electric heater to be in heating operation. state, the four-way reversing valve is switched to the communication direction, and the compressor operates at the operating frequency.

In the preferred technical solution of the defrost control method of the heat pump water heater, determining the second hot water opening of the hot water control valve according to the indoor ambient temperature includes:

When the indoor ambient temperature is greater than or equal to the preset upper limit temperature value, determine the second hot water opening of the hot water control valve to be the first percentage;

When the indoor ambient temperature is less than or equal to the preset lower limit temperature value, determine the second hot water opening of the hot water control valve to be a second percentage;

When the indoor ambient temperature is greater than the preset lower limit temperature value and less than the preset upper limit temperature, determine the second hot water opening of the hot water control valve to be a third percentage;

Wherein, the preset lower limit temperature value is less than the preset upper limit temperature, and the third percentage is greater than the second percentage and less than the first percentage.

In the preferred technical solution of the defrost control method of the heat pump water heater, the method further includes:

Receive a heat recovery instruction, which is used to indicate entering the heat recovery mode;

Based on the heat recovery instruction, obtain the heating operation time of the hot water heat exchanger;

Determine the frost information of the outdoor heat exchanger according to the heating operation time;

According to the frost information of the outdoor heat exchanger, the heating circuit of at least one space where the heat pump water heater acts is controlled to be opened, and the opening of the heating circuit is used to recover heat in the at least one space.

In the preferred technical solution of the defrosting control method of the heat pump water heater, controlling the opening of the heating circuit of at least one space where the heat pump water heater acts based on the frost information of the outdoor heat exchanger includes:

When the frost amount of the outdoor heat exchanger is less than the preset frost amount, control the heating circuit of the first space where the heat pump water heater acts to open and the heating circuit of the second space where the heat pump water heater acts to close;

When the amount of frost in the outdoor heat exchanger is greater than or equal to the preset amount of frost, the heating circuits of all spaces acted upon by the heat pump water heater are controlled to open.

When the amount of frost in the outdoor heat exchanger is less than the preset amount of frost, determine the third hot water opening of the hot water control valve, the third control opening of the main control valve, and the heating control valve. The heating opening of the valve, the communication direction of the four-way reversing valve and the operating frequency of the compressor;

Control the hot water control valve to be at the third hot water opening, the main control valve to be at the third control opening, the heating control valve to be at the heating opening, the four-way reversing valve The direction of communication is reversed and the compressor operates at the operating frequency.

When the amount of frost in the outdoor heat exchanger is greater than or equal to the preset amount of frost, determine the fourth hot water opening of the hot water control valve, the fourth control opening of the main control valve, and the The heating opening of the heating control valve, the communication direction of the four-way reversing valve and the operating frequency of the compressor;

Control the hot water control valve to be at the fourth hot water opening, the main control valve to be at the fourth control opening, the heating control valve to be at the heating opening, the four-way reversing valve The direction of communication is reversed and the compressor operates at the operating frequency.

Obtain the current temperature and current humidity in the first space;

Determine whether the heat recovery of the at least one space is completed according to the current temperature and the current humidity;

When the heat recovery of the at least one space is completed, the heat recovery mode is exited.

In a second aspect, embodiments of the present invention provide a defrost control device for a heat pump water heater, a processor integrated in the heat pump water heater, and the heat pump water heater includes the processor, a water tank, and a heat exchanger connected to the processor. Water heat exchanger, electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly; the control valve assembly includes a four-way reversing valve, main control valve, hot water control valve and heating control valve ; The compressor is connected to the outdoor heat exchanger and the indoor heat exchanger respectively through the four-way reversing valve, and the indoor heat exchanger is connected to the heating control valve and the hot water control valve through the heating control valve and the hot water control valve. The hot water heat exchanger is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger passes through the hot water control valve and the main control valve. Communicated with the outdoor heat exchanger, the electric heater is located in the water tank and used to electrically heat the water tank; the device includes:

An acquisition module, used to acquire the temperature of the water tank when it is detected that the preset defrost conditions are met;

A control module used to control the working status of each control valve in the compressor, the electric heater and the control valve assembly according to the temperature of the water tank and the preset water tank temperature.

In a third aspect, embodiments of the present invention provide a heat pump water heater, including:

Processor, memory, communication interface, water tank, and hot water heat exchanger, electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly connected to the processor;

The control valve assembly includes a four-way reversing valve, a main control valve, a hot water control valve and a heating control valve;

The compressor is connected to the outdoor heat exchanger and the indoor heat exchanger respectively through the four-way reversing valve, and the indoor heat exchanger is connected to the indoor heat exchanger through the heating control valve and the hot water control valve. The hot water heat exchanger is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger is connected with the hot water control valve and the main control valve through the hot water control valve and the main control valve. The outdoor heat exchanger is connected, and the electric heater is located in the water tank and used to electrically heat the water tank;

The memory is used to store executable instructions of the processor;

Wherein, the processor is the defrost control device described in the second aspect.

In a fourth aspect, embodiments of the present invention provide a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the defrosting control method of a heat pump water heater according to any one of the first aspects is implemented.

In a fifth aspect, embodiments of the present invention provide a computer program product, including a computer program, which when executed by a processor is used to implement the defrost control method of a heat pump water heater according to any one of the first aspects.

In a sixth aspect, embodiments of the present invention provide a chip. The chip includes a memory and a processor. Code and data are stored in the memory. The memory is coupled to the processor. The processor runs the memory. The program enables the chip to execute the defrost control method of the heat pump water heater according to any one of the above first aspects.

In a seventh aspect, an embodiment of the present invention provides a computer program, which, when executed by a processor, is used to execute the defrost control method of a heat pump water heater according to any one of the above first aspects.

Those skilled in the art can understand that the defrost control method, device, equipment and medium of the heat pump water heater provided by the embodiment of the present invention determines different defrost plans according to the temperature of the water tank when the outdoor heat exchanger needs to be defrosted. . When the water tank temperature is high, more high-temperature and high-pressure refrigerant flows to the outdoor heat exchanger for defrosting; when the water tank temperature is low, more high-temperature and high-pressure refrigerant flows to the water tank to heat the water in the water tank. This solution controls the amount of refrigerant flowing to the outdoor heat exchanger and water tank to achieve defrosting while heating hot water, and has a high degree of optimization in the distribution of hot water and defrosting energy.

Description of the drawings

Preferred embodiments of the defrost control method of the heat pump water heater of the present invention will be described below with reference to the accompanying drawings. Attached is the picture.

Figure 1 is a schematic structural diagram of the heat pump water heater provided by the present invention;

Figure 2 is a schematic flow chart of Embodiment 1 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 3 is a schematic flow chart of Embodiment 2 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 4 is a schematic flow chart of Embodiment 3 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 5 is a schematic flow chart of Embodiment 4 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 6 is a schematic flow chart of Embodiment 5 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 7 is a schematic flow chart of Embodiment 6 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 8 is a schematic flow chart of Embodiment 7 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 9 is a schematic flow chart of Embodiment 8 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 10 is a schematic flow chart of Embodiment 9 of the defrost control method for a heat pump water heater provided by the present invention;

Figure 11 is a schematic structural diagram of Embodiment 1 of a defrost control device for a heat pump water heater provided by the present invention;

Figure 12 is a schematic structural diagram of Embodiment 2 of a defrost control device for a heat pump water heater provided by the present invention;

Figure 13 is a schematic structural diagram of the heat pump water heater provided by the present invention.

Detailed ways

First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application situations.

Secondly, it should be noted that in the description of the embodiments of the present invention, the terms “inner”, “outer”, etc. indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for convenience. Descriptions are not intended to indicate or imply that the device or component must have a particular orientation, be constructed and operate in a particular orientation, and therefore are not to be construed as limitations of the invention.

In addition, it should be noted that in the description of the embodiments of the present invention, unless otherwise clearly stated and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

With the development of science and technology, the emergence of water heaters has met people's needs for hot water; the emergence of air conditioners has met people's needs for heating and cooling. However, hot water heating equipment and heating and cooling equipment are not operated at full capacity 24 hours a day, which will lead to low space utilization and equipment utilization.

To this end, researchers have proposed a new type of air source heat pump water heater. The new air source heat pump water heater can be used for multiple purposes and can meet the user's needs for heating, cooling and hot water at the same time. Compared with traditional air source heat pump water heaters, Heat pump water heaters and refrigeration and heating equipment not only improve equipment utilization and energy utilization, but also reduce the installation space occupied indoors to greatly improve space utilization.

However, when the new air source heat pump water heater is running in winter, the outdoor heat exchanger usually frosts, and defrosting is required at this time. How to defrost the new air source heat pump water heater during the process of heating water? It remains to be studied.

This embodiment provides a defrosting control method for a heat pump water heater. By fully considering the water tank temperature when the outdoor heat exchanger needs to be defrosted, when the water tank temperature is higher, the compressor generates more high-temperature and high-pressure refrigerant. It flows to the outdoor heat exchanger for defrosting, and a small amount flows to the water tank to heat the water in the water tank. When the water tank temperature is low, more refrigerant flows to the water tank to heat the water in the water tank, and a small amount flows to the outdoor heat exchanger for defrosting. It can not only achieve defrosting, but also ensure a high temperature in the water tank to meet user needs.

The principles and features of the embodiments of the present invention are described below with reference to the accompanying drawings. The examples cited are only used to explain the embodiments of the present invention and are not intended to limit the scope of the embodiments of the present invention.

Figure 1 is a schematic structural diagram of a heat pump water heater provided by the present invention. As shown in Figure 1, an embodiment of the present invention provides a heat pump water heater. The heat pump water heater can also be called an air source heat pump water heater. The heat pump water heater may include: a processor 100, a water tank 103, a hot water heat exchanger 102 connected to the processor, an electric heater 104, a compressor 101, an indoor heat exchanger 109, an outdoor heat exchanger 111 and a control valve assembly; control The valve assembly includes a four-way reversing valve 110, a main control valve 113, a hot water control valve 107 and a heating control valve 108; the compressor 101 is connected to the outdoor heat exchanger 111 and the indoor heat exchanger 109 respectively through the four-way reversing valve 110. , the indoor heat exchanger 109 is connected to the hot water heat exchanger 102 through the heating control valve 108 and the hot water control valve 107. The hot water heat exchanger 102 is connected to the water tank 103 and is used to heat the water in the water tank 103. The hot water exchanger The heater 103 is connected to the outdoor heat exchanger 111 through the hot water control valve 107 and the main control valve 113. The electric heater 104 is located in the water tank 103 and is used to electrically heat the water in the water tank 103.

When heating hot water and defrosting at the same time, there are two circuits in the heat pump water heater to realize hot water heating and defrosting respectively. For the hot water heating circuit, the high-temperature and high-pressure refrigerant is output from the compressor 101 and reaches it through the tee port. The hot water heat exchanger 102 performs heat exchange to heat the water in the water tank 103. The refrigerant then passes from the hot water heat exchanger 102 through the hot water control valve 107, the three-way port and the heating control valve 108 to the indoor heat exchanger 109. Heat exchange is performed, and the refrigerant flows from the indoor heat exchanger 109 back to the compressor 110 through the four-way reversing valve 110 . For the defrost circuit, high-temperature and high-pressure refrigerant is output from the compressor 101 and reaches the outdoor heat exchanger 111 through the four-way reversing valve 110 for heat exchange and defrosting. The refrigerant then passes through the main control valve from the outdoor heat exchanger 111. 113. The three-way port merges with the refrigerant in the hot water circuit, passes through the heating control valve 108 and reaches the indoor heat exchanger 109. The refrigerant then flows from the indoor heat exchanger 109 back to the compressor 110 through the four-way reversing valve 110.

It should be noted that, as can be seen from Figure 1, the heat pump water heater may also include an economizer, and the control valve assembly may include an auxiliary control valve 114. The economizer is connected between the main control valve 113 and the compressor 101, and the auxiliary control valve 114 is connected to Between the main control valve 113 and the economizer. Specifically, the functions of the economizer and the auxiliary control valve 114 in the heat pump water heater can be referred to the descriptions in the related art, and will not be further elaborated in this embodiment.

The heat pump water heater provided in this embodiment can defrost while heating water through the hot water circuit and the defrost circuit. In addition, it can also realize the distribution of hot water by controlling the opening of the main control valve and the heating valve. and defrosting energy distribution, making energy distribution more optimized.

Below, the technical solution of the present application will be described in detail through specific embodiments in conjunction with the accompanying drawings and the structure of the heat pump water heater. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

Figure 2 is a schematic flow chart of Embodiment 1 of the defrost control method of the heat pump water heater provided by the present invention. As shown in Figure 2, the defrost control method of the heat pump water heater specifically includes the following steps:

S201: Obtain the temperature of the water tank when it is detected that the preset defrost conditions are met.

When the heat pump water heater is operated at a low temperature, the outdoor heat exchanger may frost, affecting the operation of the heat pump water heater, so defrost is required.

In this step, when it is detected that the preset defrosting conditions are met, the temperature of the water tank 103 is obtained, so that the defrosting plan can be subsequently determined based on the temperature of the water tank 103 .

It should be noted that the way the heat pump water heater detects that the preset defrost conditions are met may be: the heat pump water heater performs scheduled defrost, and when the time reaches a certain time, the preset defrost conditions are met. The way the heat pump water heater detects that the preset defrost conditions are met can also be: the heat pump water heater detects the outdoor ambient temperature. When the outdoor ambient temperature is less than the preset ambient temperature, the preset defrost conditions are met. The preset ambient temperature can be - 5 degrees Celsius, -8 degrees Celsius, -10 degrees Celsius, etc. The way for the heat pump water heater to detect that the preset defrost conditions are met can also be: when the heating operation time of the compressor 101 reaches the preset first duration, the preset defrost conditions are met, and the preset first duration can be 30 minutes. , 1 hour, 2 hours. The embodiment of the present invention does not specifically limit the way in which the heat pump water heater detects that the preset defrost conditions are met, nor does it specifically limit the preset ambient temperature and the preset first duration, which can be selected and set according to the actual situation.

It should be noted that a first temperature sensor 105 can also be installed on the upper part of the water tank 103 of the heat pump water heater, and a second temperature sensor 106 can also be installed on the lower part of the water tank 103. The first temperature sensor 105 and the second temperature sensor 106 are used for Check the temperature of the water tank. The way the heat pump water heater obtains the temperature of the water tank can be to obtain the temperature of the water tank only through the first temperature sensor 105; it can also obtain two temperatures through the first temperature sensor 105 and the second temperature sensor 106, and then calculate the average value as the temperature of the water tank; It is also possible to obtain the water tank temperature only through the second temperature sensor 106 . The embodiment of the present invention does not limit the way in which the heat pump water heater obtains the temperature of the water tank, and the method can be selected according to the actual situation.

S202: Control the working status of each control valve in the compressor, electric heater and control valve assembly according to the temperature of the water tank and the preset water tank temperature.

In this step, after the heat pump water heater obtains the temperature of the water tank 103, it controls the working status of the compressor 101, the electric heater 104 and each control valve in the control valve assembly according to the temperature of the water tank 103 and the preset water tank temperature. When the temperature of the water tank 103 is greater than the preset water tank temperature, it means that the energy used for heating water can be relatively less, and more energy can be used for defrosting. The main control valve 113 in the control valve assembly can be controlled at a larger value. This is achieved by keeping the opening of the hot water control valve 107 at a smaller opening. When the temperature of the water tank 103 is less than or equal to the preset water tank temperature, it means that relatively more energy can be used for heating water and less energy can be used for defrosting. By controlling the main control valve 113 in the control valve assembly, This can be achieved by placing a smaller opening and the hot water control valve 107 at a larger opening.

It should be noted that the preset water tank temperature is set in the heat pump water heater by the staff or the user before the implementation of this plan, and is used to determine the relationship with the water tank temperature. The preset water tank temperature can be 40 degrees Celsius, 45 degrees Celsius, or 50 degrees Celsius. The embodiment of the present invention does not specifically limit the preset water tank temperature, and can set it according to actual conditions.

It should be noted that when the heat pump water heater detects that the defrost is completed, it exits the defrost and restores the working status of the compressor 101, the electric heater 104 and the control valves in the control valve assembly to the working status before defrosting. .

It should be noted that the way the heat pump water heater detects the completion of defrost can be: detect the temperature of the outdoor heat exchanger. When the temperature of the outdoor heat exchanger reaches the preset defrost completion temperature, the defrost is complete; the preset defrost completion temperature is The frost completion temperature can be 10 degrees Celsius, 15 degrees Celsius, or 20 degrees Celsius. The way the heat pump water heater detects the completion of defrost can also be: according to the running time of the compressor during the defrosting process, when the running time reaches the preset second time, the defrost is completed; the preset second time can be 8 minutes , 10 minutes, maybe 15 minutes. The embodiment of the present invention does not limit the way in which the heat pump water heater detects the completion of defrost, nor does it specifically limit the preset defrost completion temperature and the preset second duration, which can be selected and set according to actual conditions.

The defrost control method of the heat pump water heater provided in this embodiment determines the defrost plan based on the obtained water tank temperature when defrosting is required. When the water tank temperature is higher, more energy is used for defrosting, and when the water tank temperature is lower, more energy is used for heating water. It can achieve defrosting while heating hot water, and the energy distribution is highly optimized.

Figure 3 is a schematic flow chart of Embodiment 2 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 3, based on the above embodiment, step S202 in Embodiment 1 can be implemented through the following steps:

S301: When the temperature of the water tank is greater than or equal to the preset water tank temperature, determine the first hot water opening of the hot water control valve, the first control opening of the main control valve, the heating opening of the heating control valve, and the opening of the electric heater. Working status, the connection direction of the four-way reversing valve and the working frequency of the compressor.

In this step, after the heat pump water heater obtains the temperature of the water tank 103, it compares it with the preset water tank temperature. When the temperature of the water tank 103 is greater than or equal to the preset water tank temperature, it determines that the opening degree of the hot water control valve 107 is the first. A hot water opening, the opening of the main control valve 113 is the first control opening, the opening of the heating control valve 108 is the heating opening, the working state of the electric heater 104, the communication direction of the four-way reversing valve 110 and The operating frequency of the compressor 101. The communication direction of the four-way reversing valve 104 is: port a is connected to port c, which allows the compressor 101 to communicate with the outdoor heat exchanger 111 through the four-way reversing valve 110; port b is connected to port d, which allows indoor heat exchange. The compressor 109 communicates with the compressor through the four-way reversing valve 110.

It should be noted that the first hot water opening degree may be 10%, 15%, or 20%. The first control opening may be 70%, 80%, or 90%. The heating opening can be 80%, 90%, or 100%. The working frequency of the compressor 101 may be 50Hz, 60Hz, or 70Hz. The embodiment of the present invention does not limit the first hot water opening, the first control opening, the heating opening, and the operating frequency of the compressor 101, and can be set according to actual conditions.

It should be noted that the working state of the electric heater 104 may be a heating working state or a heating stopped state. The way to determine the working status of the electric heater 104 may be: the staff can pre-set the working status in the heat pump water heater, and the heat pump water heater can directly determine it. The working state of the electric heater 104 may also be determined by determining the working state of the electric heater 104 before defrosting as the working state of the electric heater 104 . It should be noted that the embodiment of the present invention does not limit the method of determining the working state of the electric heater 104, and the method can be selected according to actual conditions.

S302: Control the hot water control valve to be at the first hot water opening, the main control valve to be at the first control opening, the heating control valve to be at the heating opening, the electric heater to be in the working state, and the four-way reversing valve to be switched to connectivity. direction as well as the operating frequency at which the compressor operates.

In this step, the heat pump water heater determines the openings of the hot water control valve 107, the main control valve 113, and the heating control valve 108, the working status of the electric heater 104, the communication direction of the four-way reversing valve 110, and the operation of the compressor 101. After frequency, the hot water control valve 107 is controlled to be at the first hot water opening, the main control valve 113 is at the first control opening, the heating control valve 108 is at the heating opening, the electric heater 104 is in the working state, and the four-way switch The directional valve 110 is switched to the communication direction and the compressor 101 is operated at the operating frequency.

It should be noted that the heat pump water heater can also control the auxiliary control valve 114 to close and the fan 112 to close.

Specifically, when the hot water control valve 107 is at a smaller first hot water opening and the main control valve 113 is at a larger first control opening, for hot water, high-temperature and high-pressure refrigerant is output from the compressor 101 , flows through the three-way port, hot water heat exchanger 102, hot water valve 107, heating valve 108, indoor heat exchanger 109, port b of the four-way reversing valve 110, and port d of the four-way reversing valve 110 in sequence. flows back to compressor 101. For defrosting, high-temperature and high-pressure refrigerant is output from the compressor 101 and flows through the three-way port, port a of the four-way reversing valve 110, port c of the four-way reversing valve 110, outdoor heat exchanger 111, and main control in sequence. The valve 113, the heating valve 108, the indoor heat exchanger 109, the b port of the four-way reversing valve 110, and the d port of the four-way reversing valve 110 flow back to the compressor 101. The amount of refrigerant flowing through the hot water circuit is relatively small, and the amount flowing through the defrosting circuit is relatively large.

The defrost control method of the heat pump water heater provided in this embodiment controls the hot water control valve to be at a smaller opening and the main control valve to be at a larger opening when the water tank temperature is greater than or equal to the preset water tank temperature, so that More energy is used for defrosting and less energy is used for heating water. This solution can both heat hot water and defrost, and can ensure that the temperature of the water in the water tank is at a higher temperature. It can also improve defrosting efficiency and make the energy distribution of hot water heating and defrosting more reasonable.

Figure 4 is a schematic flow chart of Embodiment 3 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 4, based on the above embodiment, step S202 in Embodiment 1 can be implemented through the following steps:

S401: When the temperature of the water tank is lower than the preset water tank temperature, obtain the current indoor ambient temperature.

In this step, after the heat pump water heater obtains the temperature of the water tank 103, it compares it with the preset water tank temperature. When the temperature of the water tank 103 is lower than the preset water tank temperature, it means that the temperature of the water in the current water tank 103 is lower. In order to To meet the user's demand for hot water, more energy needs to be used for heating water, which requires obtaining the current indoor ambient temperature so that the energy used for heating hot water can be allocated according to the ambient temperature.

S402: Determine the second hot water opening of the hot water control valve according to the indoor ambient temperature.

In this step, after the heat pump water heater obtains the indoor ambient temperature, in order to provide a better user experience, the higher the indoor ambient temperature, the faster the hot water needs to be heated. Therefore, the second position of the hot water control valve must be determined based on the indoor ambient temperature. Hot water opening.

It should be noted that when the temperature of the water tank 103 is lower than the preset water tank temperature, compared with the case where the temperature of the water tank 103 is greater than or equal to the preset water tank temperature, more energy is used to heat hot water, so the second embodiment is required. The opening degree of the first hot water in is smaller than the opening degree of the second hot water. The second hot water opening degree may be 30%, 50%, or 90%. The second hot water opening degree is not specifically limited in the embodiment of the present invention and can be selected according to the actual situation.

S403: Determine the second control opening of the main control valve, the heating opening of the heating control valve, the heating working state of the electric heater, the communication direction of the four-way reversing valve, and the working frequency of the compressor.

In this step, when the heat pump water heater determines that the temperature of the water tank 103 is less than the preset water tank temperature, it also determines that the opening of the main control valve 113 is the second control opening, the opening of the heating control valve 108 is the heating opening, and the electric heating The heating working state of the heater 104, the communication direction of the four-way reversing valve 110 and the operating frequency of the compressor 101. The communication direction of the four-way reversing valve 104 is: port a is connected to port c, which allows the compressor 101 to communicate with the outdoor heat exchanger 111 through the four-way reversing valve 110; port b is connected to port d, which allows indoor heat exchange. The compressor 109 communicates with the compressor through the four-way reversing valve 110. In order to quickly heat hot water, the working state of the electric heater 104 is a heating working state.

It should be noted that the heating opening can be 80%, 90%, or 100%. The working frequency of the compressor 101 may be 50Hz, 60Hz, or 70Hz. The embodiment of the present invention does not limit the heating opening and the operating frequency of the compressor 101, and can be set according to actual conditions.

It should be noted that when the temperature of the water tank 103 is less than the preset water tank temperature, compared with the case where the temperature of the water tank 103 is greater than or equal to the preset water tank temperature, less energy is used for defrosting, so the second embodiment is required. The first control opening is greater than the second control opening. The second control opening may be 30%, 40%, or 50%. The embodiment of the present invention does not specifically limit the second control opening and may be selected according to actual conditions.

It should be noted that the order of execution from the steps of obtaining the indoor ambient temperature to determining the second hot water opening degree and step S403 may be to first execute the steps of obtaining the indoor ambient temperature to determining the second hot water opening degree, and then execute step S403 ; Alternatively, step S403 may be executed first, and then the steps of obtaining the indoor ambient temperature to determining the second hot water opening degree may be executed; or the steps of acquiring the indoor ambient temperature to determining the second hot water opening degree may be executed simultaneously with step S403. The embodiment of the present invention does not limit the execution order of the steps from obtaining the indoor ambient temperature to determining the second hot water opening degree and step S403, which can be determined according to the actual situation.

S404: Control the hot water control valve to be at the second hot water opening, the main control valve to be at the second control opening, the heating control valve to be at the heating opening, the electric heater to be in the heating working state, and the four-way reversing valve to be reversed to direction of communication and the operating frequency at which the compressor operates.

In this step, the heat pump water heater determines the openings of the hot water control valve 107, the main control valve 113, and the heating control valve 108, the working status of the electric heater 104, the communication direction of the four-way reversing valve 110, and the operation of the compressor 101. After frequency, the hot water control valve 107 is controlled to be at the second hot water opening, the main control valve 113 is at the second control opening, the heating control valve 108 is at the heating opening, the electric heater 104 is in the working state, and the four-way switch The directional valve 110 is switched to the communication direction and the compressor 101 is operated at the operating frequency.

Specifically, when the hot water control valve 107 is at a larger second hot water opening and the main control valve 113 is at a smaller second control opening, for hot water, high-temperature and high-pressure refrigerant is output from the compressor 101 , flows through the three-way port, hot water heat exchanger 102, hot water valve 107, heating valve 108, indoor heat exchanger 109, port b of the four-way reversing valve 110, and port d of the four-way reversing valve 110 in sequence. flows back to compressor 101. For defrosting, high-temperature and high-pressure refrigerant is output from the compressor 101 and flows through the three-way port, port a of the four-way reversing valve 110, port c of the four-way reversing valve 110, outdoor heat exchanger 111, and main control in sequence. The valve 113, the heating valve 108, the indoor heat exchanger 109, the b port of the four-way reversing valve 110, and the d port of the four-way reversing valve 110 flow back to the compressor 101. The amount of refrigerant flowing through the heating water circuit is relatively large, and the amount flowing through the defrosting circuit is relatively small.

In the defrost control method of the heat pump water heater provided by this embodiment, when the water tank temperature is lower than the preset water tank temperature, the opening of the hot water control valve is determined according to the indoor ambient temperature, and the opening is relatively small, and the main control valve is in A larger opening means less energy is used for defrosting and more energy is used for heating water. This solution can both heat hot water and defrost, and can ensure that the temperature of the water in the water tank is at a higher temperature, and the energy distribution of hot water heating and defrosting is more reasonable.

Figure 5 is a schematic flowchart of Embodiment 4 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 5, based on the above embodiment, step S402 in Embodiment 3 can be implemented through the following steps:

S501: When the indoor ambient temperature is greater than or equal to the preset upper limit temperature value, determine the second hot water opening of the hot water control valve to be the first percentage.

In this step, after the heat pump water heater obtains the current indoor ambient temperature, when the indoor ambient temperature is greater than or equal to the preset upper temperature value, it determines that the second hot water opening of the hot water control valve 107 is the first percentage.

It should be noted that the preset upper limit temperature value and the first percentage are set in the heat pump water heater by the staff or the user before the implementation of this solution, and are used to determine the second hot water opening degree. The default online temperature value can be 23 degrees Celsius, 25 degrees Celsius, or 28 degrees Celsius. The first percentage can be 60%, 65%, or 70%. The embodiment of the present invention does not specifically limit the preset upper limit temperature value and the first percentage, and can be set according to actual conditions.

S502: When the indoor ambient temperature is less than or equal to the preset lower limit temperature value, determine the second hot water opening of the hot water control valve to be the second percentage.

In this step, after the heat pump water heater obtains the current indoor ambient temperature, when the indoor ambient temperature is less than or equal to the preset lower limit temperature value, it determines that the second hot water opening of the hot water control valve 107 is the second percentage.

It should be noted that the preset lower limit temperature value and the second percentage are set in the heat pump water heater by the staff or the user before the implementation of this solution, and are used to determine the second hot water opening degree. The default online temperature value can be 17 degrees Celsius, 20 degrees Celsius, or 22 degrees Celsius. The second percentage can be 45%, 50%, or 55%. The embodiment of the present invention does not specifically limit the preset lower limit temperature value and the second percentage, and can be set according to actual conditions.

S503: When the indoor ambient temperature is greater than the preset lower limit temperature value and less than the preset upper limit temperature, determine the second hot water opening of the hot water control valve to be the third percentage.

In this step, after the heat pump water heater obtains the current indoor ambient temperature, when the indoor ambient temperature is greater than the preset lower limit temperature value and less than the preset upper limit temperature, it determines that the second hot water opening of the hot water control valve 107 is the third percentage.

It should be noted that the third percentage is set in the heat pump water heater by the staff or the user before the implementation of this solution, and is used to determine the second hot water opening. The third percentage can be 30%, 35%, or 40%. The embodiment of the present invention does not specifically limit the third percentage, and it can be set according to actual conditions.

It should be noted that the preset lower limit temperature value is less than the preset upper limit temperature, and the third percentage is greater than the second percentage and less than the first percentage.

For example, the relationship between the indoor ambient temperature and the opening degree of the second hot water is as shown in Table 1:

Table 1

室内环境温度indoor ambient temperature	第二热水开度The second hot water opening degree
T≥25℃T≥25℃	65％65%
20℃<T<25℃20℃<T<25℃	50％50%
T≤20℃T≤20℃	35％35%

As shown in Table 1, T represents the indoor ambient temperature, the preset upper limit temperature value is 25°C, and the preset lower limit temperature value is 20°C. When T≥25℃, the second hot water opening is 65%; when 20℃<T<25℃, the second hot water opening is 50%; when T≤20℃, the second hot water opening is is 35%;

It should be noted that Table 1 is only an example of the relationship between the indoor ambient temperature and the second hot water opening degree, and does not describe the indoor ambient temperature, the second hot water opening degree, the preset upper limit temperature value, and the preset lower limit temperature. The value is limited and can be determined and set according to the actual situation.

It should be noted that the numbers of steps S501, S502, and S503 are not the execution order of the three steps, but determine which of them to execute based on the relationship between the indoor ambient temperature and the preset upper limit temperature value and the preset lower limit temperature value. step.

The defrost control method of the heat pump water heater provided in this embodiment determines the second hot water opening of the hot water control valve according to the relationship between the indoor ambient temperature and the preset upper limit temperature value and the preset lower limit temperature value, effectively improving the determination of the heat pump water heater. Second, the accuracy of the hot water opening.

Figure 6 is a schematic flow chart of Embodiment 5 of the defrost control method of the heat pump water heater provided by the present invention. As shown in Figure 6, the defrost control method of the heat pump water heater also includes the following steps:

S601: Receive heat recovery command.

After taking a bath or cooking, the user can turn on the heat recovery mode when the temperature of the bathroom or kitchen is high, and the recovered energy can be used for heating water and defrosting.

In this step, the user turns on the heat recovery mode, and the heat pump water heater accepts the heat recovery command. The heat recovery command is used to indicate entering the heat recovery mode.

It should be noted that the user can turn on the heat recovery mode through voice control. The user speaks the heat recovery command, and the heat pump water heater can receive the heat recovery command. The user can also turn on the heat recovery mode by directly operating on the heat pump water heater. For example, by clicking a corresponding button, the heat pump water heater receives the heat recovery instruction. The user can also turn on the heat recovery mode by sending the heat recovery command to the server through the terminal device. The server then sends the heat recovery command to the heat pump water heater, and the heat pump water heater receives the heat recovery command. The embodiment of the present invention does not limit the way in which the user turns on the heat recovery mode, and the user can choose according to the actual situation.

S602: Based on the heat recovery command, obtain the heating operation time of the hot water heat exchanger.

S603: Determine the frost information of the outdoor heat exchanger based on the heating operation time.

In the above steps, after the heat pump water heater receives the heat recovery command, in order to determine which spaces to open the heating circuits, it is necessary to obtain the heating operation time of the hot water heat exchanger 102 based on the heat recovery command, which is also the heating time of the compressor 101. The operating time, and then based on the heating operating time, the frost information of the outdoor heat exchanger 111 is determined. In order to subsequently determine which spaces to open the heating circuit based on the frost information. The frost information is used to indicate the amount of frost on the outdoor heat exchanger 111 .

For example, if the heating operation time is greater than or equal to the preset third time length, for example, the preset third time length is 50 minutes, then it is determined that the amount of frost in the outdoor heat exchanger 111 is greater than or equal to the preset frost time. amount; if the heating duration is less than the preset third duration, it is determined that the frost amount of the outdoor heat exchanger 111 is less than the preset frost amount. The preset third duration can also be 40 minutes or 1 hour. The embodiment of the present invention does not limit the preset third duration and can be set according to actual conditions.

Optionally, the method of determining the frost information of the outdoor heat exchanger 111 can also be: installing an infrared sensor on the outdoor heat exchanger 111 to directly obtain the frost thickness on the outdoor heat exchanger 111. If the frost thickness is greater than or is equal to the preset thickness. For example, if the preset thickness is 5 mm, it is determined that the frost amount of the outdoor heat exchanger 111 is greater than or equal to the preset frost amount; if the frost thickness is less than the preset thickness, it is determined that the outdoor heat exchanger 111 is frosted. The amount of frost on the heater 111 is less than the preset amount of frost. The preset thickness can also be 6 mm or 8 mm. The embodiment of the present application does not specifically limit the preset thickness, and it can be set according to actual conditions.

Optionally, the method of determining the frost information of the outdoor heat exchanger 111 may also be: determining the frost information of the outdoor heat exchanger 111 according to the temperature of the outdoor heat exchanger 111 . If the temperature of the outdoor heat exchanger 111 is less than or equal to the preset frost temperature, for example, the frost temperature is -5 degrees Celsius, then it is determined that the frost amount of the outdoor heat exchanger 111 is greater than or equal to the preset frost amount; If the temperature of the heat exchanger 111 is greater than the preset frost temperature, it is determined that the frost amount of the outdoor heat exchanger 111 is less than the preset frost amount. The preset frost temperature can also be 0 degrees Celsius or 5 degrees Celsius. The embodiment of the present invention does not specifically limit the preset frosting temperature, and can set it according to actual conditions.

It should be noted that the embodiment of the present invention does not limit the method of determining the frost information of the outdoor heat exchanger 111, and the method can be selected according to the actual situation.

S604: According to the frost information of the outdoor heat exchanger, control the opening of the heating circuit of at least one space where the heat pump water heater acts.

In this step, after the heat pump water heater determines the frosting situation of the outdoor heat exchanger 111, it controls the opening of the heating circuit of at least one space where the heat pump water heater acts based on the frosting information of the outdoor heat exchanger. The heating circuit is opened for recycling at least Heat in a space. When the frost amount 111 of the outdoor heat exchanger is less than the preset frost amount, it means that less energy is required for defrosting, and a heating circuit with less space can be opened. When the frost amount 111 of the outdoor heat exchanger is greater than or equal to the preset frost amount, it means that more energy is required for defrosting, and more space heating circuits can be opened.

This embodiment provides a defrost control method for a heat pump water heater. After receiving a heat recovery command, the heat pump water heater determines that the heating circuit of at least one space is to be opened based on the frost information of the outdoor heat exchanger. It can realize heat recovery and reduce energy waste.

Figure 7 is a schematic flow chart of Embodiment 6 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 7, based on the above embodiment, step S604 in Embodiment 5 can be implemented through the following steps:

S701: When the frost amount of the outdoor heat exchanger is less than the preset frost amount, control the heating circuit of the first space where the heat pump water heater acts to open and the heating circuit of the second space where the heat pump water heater acts to close.

In this step, after the heat pump water heater determines the frost information of the outdoor heat exchanger 111, when the frost amount of the outdoor heat exchanger 111 is less than the preset frost amount, it controls the opening of the heating circuit of the first space where the heat pump water heater acts. And the heating circuit of the second space where the heat pump water heater acts is closed.

Specifically, a temperature sensor can be installed in each space where the heat pump water heater acts, and each temperature sensor is connected to the processor of the heat pump water heater. When the amount of frost in the outdoor heat exchanger 111 is less than the preset amount, it means that less energy is required for defrosting, and the heating circuit of at least one space can be opened. Which spaces are included in the first space can be determined by the temperature of each space, sorted according to the temperature from high to low, and the space with the highest temperature is determined as the first space, or the spaces corresponding to the first three temperatures are determined as the first space. space. Among all spaces acted upon by the heat pump water heater, the space other than the first space is determined as the second space. The embodiment of the present invention does not limit the number of spaces included in the first space, and can be set according to actual conditions.

Optionally, the method of determining the first space and the second space that the heat pump water heater acts on can also be: after the heat pump water heater is installed, the user can set the heating circuits of which spaces are turned on, and the heat pump water heater can determine these spaces as the third space. One space. Among all spaces acted upon by the heat pump water heater, the space other than the first space is determined as the second space.

It should be noted that the embodiment of the present invention does not limit the method of determining the first space and the second space in which the heat pump water heater acts, and the selection can be made according to the actual situation.

S702: When the amount of frost in the outdoor heat exchanger is greater than or equal to the preset amount of frost, control the opening of the heating circuit in all spaces where the heat pump water heater acts.

In this step, after the heat pump water heater determines the frost information of the outdoor heat exchanger 111, when the amount of frost in the outdoor heat exchanger is greater than or equal to the preset amount of frost, it controls the amount of energy required for defrosting. Make sure the heating circuit is open in all spaces served by the heat pump water heater.

Optionally, when the frost amount 111 of the outdoor heat exchanger is greater than or equal to the preset frost amount, after the heat pump water heater is installed, the user can set the heating circuits of which spaces to turn on, so that the heat pump water heater can directly determine which spaces to turn on. heating circuit.

It should be noted that the numbers of steps S701 and S702 are not the execution order of the two steps, but determine which step to execute based on the relationship between the frost amount of the outdoor heat exchanger and the preset frost amount.

In the defrost control method of the heat pump water heater provided in this embodiment, the heat pump water heater determines which space heating circuits to open based on the relationship between the frost amount of the outdoor heat exchanger and the preset frost amount, which effectively improves the accuracy of energy recovery.

Figure 8 is a schematic flow chart of Embodiment 7 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 8, on the basis of the above-mentioned Embodiments 5 and 6, the defrost control method for a heat pump water heater further includes the following steps :

S801: When the frost amount of the outdoor heat exchanger is less than the preset frost amount, determine the third hot water opening of the hot water control valve, the third control opening of the main control valve, the heating opening of the heating control valve, The communication direction of the four-way reversing valve and the operating frequency of the compressor.

In this step, after the heat pump water heater determines the frost information of the outdoor heat exchanger 111, when the frost amount of the outdoor heat exchanger 111 is less than the preset frost amount, it determines that the opening degree of the hot water control valve 107 is the third heat The water opening degree and the opening degree of the main control valve 113 are the third control opening degree, the opening degree of the heating control valve 108 is the heating opening degree, the communication direction of the four-way reversing valve 110 and the operating frequency of the compressor 101. The communication direction of the four-way reversing valve 104 is: port a is connected to port c, which allows the compressor 101 to communicate with the outdoor heat exchanger 111 through the four-way reversing valve 110; port b is connected to port d, which allows indoor heat exchange. The compressor 109 communicates with the compressor through the four-way reversing valve 110.

It should be noted that the opening degree of the third hot water can be 70%, 90%, or 100%. The third control opening can be 10%, 20%, or 30%. The heating opening can be 80%, 90%, or 100%. The working frequency of the compressor 101 may be 50Hz, 60Hz, or 70Hz. The embodiment of the present invention does not limit the third hot water opening, the third control opening, the heating opening, and the working frequency of the compressor 101, and can be set according to actual conditions.

S802: Control the hot water control valve to be at the third hot water opening, the main control valve to be at the third control opening, the heating control valve to be at the heating opening, the four-way reversing valve to be switched to the connecting direction, and the compressor to work at the operating frequency .

In this step, the heat pump water heater determines the openings of the hot water control valve 107, the main control valve 113, and the heating control valve 108, the communication direction of the four-way reversing valve 110, and the operating frequency of the compressor 101, and then controls the hot water control valve. 107 is at the third hot water opening, the main control valve 113 is at the third control opening, the heating control valve 108 is at the heating opening, the four-way reversing valve 110 is switched to the connecting direction, and the compressor 101 works at the operating frequency.

Specifically, when the hot water control valve 107 is at a larger third hot water opening and the main control valve 113 is at a smaller third control opening, for hot water, high-temperature and high-pressure refrigerant is output from the compressor 101 , flows through the three-way port, hot water heat exchanger 102, hot water valve 107, heating valve 108, indoor heat exchanger 109, port b of the four-way reversing valve 110, and port d of the four-way reversing valve 110 in sequence. flows back to compressor 101. For defrosting, high-temperature and high-pressure refrigerant is output from the compressor 101 and flows through the three-way port, port a of the four-way reversing valve 110, port c of the four-way reversing valve 110, outdoor heat exchanger 111, and main control in sequence. The valve 113, the heating valve 108, the indoor heat exchanger 109, the b port of the four-way reversing valve 110, and the d port of the four-way reversing valve 110 flow back to the compressor 101. The amount of refrigerant flowing through the heating water circuit is relatively large, and the amount flowing through the defrosting circuit is relatively small.

The defrost control method of the heat pump water heater provided in this embodiment controls the hot water control valve to be at a larger opening and the main control valve to be at a smaller opening when the frost amount of the outdoor heat exchanger is less than the preset frost amount. The heat recovery energy can be used for defrosting and heating water, and the energy distribution is more reasonable.

Figure 9 is a schematic flow chart of Embodiment 8 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 9, based on the above-mentioned Embodiments 5 and 6, the defrost control method for a heat pump water heater further includes the following steps :

S901: When the frost amount of the outdoor heat exchanger is greater than or equal to the preset frost amount, determine the fourth hot water opening of the hot water control valve, the fourth control opening of the main control valve, and the heating opening of the heating control valve. degree, the connection direction of the four-way reversing valve and the operating frequency of the compressor.

In this step, after the heat pump water heater determines the frost information of the outdoor heat exchanger 111, when the frost amount of the outdoor heat exchanger 111 is greater than or equal to the preset frost amount, it determines that the opening degree of the hot water control valve 107 is the first. The four hot water openings, the opening of the main control valve 113 are the fourth control opening, the opening of the heating control valve 108 is the heating opening, the communication direction of the four-way reversing valve 110 and the operating frequency of the compressor 101. The communication direction of the four-way reversing valve 104 is: port a is connected to port c, which allows the compressor 101 to communicate with the outdoor heat exchanger 111 through the four-way reversing valve 110; port b is connected to port d, which allows indoor heat exchange. The compressor 109 communicates with the compressor through the four-way reversing valve 110.

It should be noted that when the frost amount of the outdoor heat exchanger 111 is greater than or equal to the preset frost amount, compared with the case where the frost amount of the outdoor heat exchanger 111 is less than the preset frost amount, it is used for defrosting. The energy required is more, so it is required that the third hot water opening degree in Embodiment 7 is greater than the fourth hot water opening degree, and the third control opening degree is smaller than the fourth control opening degree. The fourth hot water opening degree can be 10%, 20%, or 30%. The fourth control opening may be 70%, 80%, or 90%. The embodiment of the present invention does not limit the fourth control opening degree and the fourth hot water opening degree, and can be set according to actual conditions.

S902: Control the hot water control valve to be at the fourth hot water opening, the main control valve to be at the fourth control opening, the heating control valve to be at the heating opening, the four-way reversing valve to be switched to the connecting direction, and the compressor to work at the operating frequency .

In this step, the heat pump water heater determines the openings of the hot water control valve 107, the main control valve 113, and the heating control valve 108, the communication direction of the four-way reversing valve 110, and the operating frequency of the compressor 101, and then controls the hot water control valve. 107 is at the fourth hot water opening, the main control valve 113 is at the fourth control opening, the heating control valve 108 is at the heating opening, the four-way reversing valve 110 is switched to the communication direction, and the compressor 101 works at the operating frequency.

Specifically, when the hot water control valve 107 is at a smaller fourth hot water opening and the main control valve 113 is at a larger fourth control opening, for hot water, high temperature and high pressure refrigerant is output from the compressor 101 , flows through the three-way port, hot water heat exchanger 102, hot water valve 107, heating valve 108, indoor heat exchanger 109, port b of the four-way reversing valve 110, and port d of the four-way reversing valve 110 in sequence. flows back to compressor 101. For defrosting, high-temperature and high-pressure refrigerant is output from the compressor 101 and flows through the three-way port, port a of the four-way reversing valve 110, port c of the four-way reversing valve 110, outdoor heat exchanger 111, and main control in sequence. The valve 113, the heating valve 108, the indoor heat exchanger 109, the b port of the four-way reversing valve 110, and the d port of the four-way reversing valve 110 flow back to the compressor 101. The amount of refrigerant flowing through the hot water circuit is relatively small, and the amount flowing through the defrosting circuit is relatively large.

The defrost control method of the heat pump water heater provided in this embodiment controls the hot water control valve to be at a smaller opening and the main control valve to be at a larger opening when the frost amount of the outdoor heat exchanger is greater than or equal to the preset frost amount. degree, the heat recovery energy can be used for defrosting and water heating, and the energy distribution is more reasonable.

Figure 10 is a schematic flow chart of Embodiment 9 of the defrost control method for a heat pump water heater provided by the present invention. As shown in Figure 10, based on the above-mentioned Embodiments 5 and 6, the defrost control method for a heat pump water heater further includes the following steps :

S1001: Obtain the current temperature and current humidity in the first space.

S1002: Determine whether the heat recovery of at least one space is completed based on the current temperature and current humidity.

S1003: When the heat recovery of at least one space is completed, exit the heat recovery mode.

In the above steps, in order to determine when to exit the heat recovery mode, it is necessary to obtain the current temperature and current humidity in the first space, and then determine whether the heat recovery of at least one space is completed based on the current temperature and current humidity. The heat recovery mode is exited when heat recovery in at least one space is completed.

Specifically, when the current temperature is less than the preset recovery completion temperature and the humidity is less than the preset recovery completion humidity, it is determined that the heat recovery in the first space is completed, the heat recovery mode is exited, and the period included in the heat pump water heater is restored to heat recovery. previous status. The preset recycling completion temperature can be 20 degrees Celsius, 25 degrees Celsius, or 27 degrees Celsius. The preset recovery completion humidity can be 40%, 50%, or 55%. The embodiment of the present invention does not limit the preset recovery completion temperature and the preset recovery completion humidity, and can be set according to actual conditions.

Optionally, when the heat pump water heater detects that defrost is completed, it can also exit the heat recovery mode and restore the period included in the heat pump water heater to the state before heat recovery.

The defrost control method of the heat pump water heater provided by this embodiment determines when to exit the heat recovery mode through the temperature and humidity in the first space, thereby improving the control accuracy of the heat pump water heater.

The following are device embodiments of the present application, which can be used to execute method embodiments of the present application. For details not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

Figure 11 is a schematic structural diagram of Embodiment 1 of the defrost control device of the heat pump water heater provided by the present invention; as shown in Figure 11, the defrost control device of the heat pump water heater is integrated into the processor of the heat pump water heater. The heat pump water heater includes a processor heat exchanger, water tank, and hot water heat exchanger, electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly connected to the processor; the control valve assembly includes a four-way reversing valve, main control valve, Hot water control valve and heating control valve; the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger respectively through the four-way reversing valve, and the indoor heat exchanger is connected to the hot water heat exchanger through the heating control valve and the hot water control valve. , the hot water heat exchanger is connected to the water tank and is used to heat the water tank. The hot water heat exchanger is connected to the outdoor heat exchanger through the hot water control valve and the main control valve. The electric heater is located in the water tank and is used to power the water tank. Heating; the defrost control device 1100 of the heat pump water heater includes:

The acquisition module 1101 is used to acquire the temperature of the water tank when it is detected that the preset defrost conditions are met;

The control module 1102 is used to control the working status of each control valve in the compressor, the electric heater and the control valve assembly according to the temperature of the water tank and the preset water tank temperature.

Further, the control module 1102 is specifically used for:

When the temperature of the water tank is greater than or equal to the preset water tank temperature, the first hot water opening of the hot water control valve, the first control opening of the main control valve, and the heating opening of the heating control valve are determined. degree, the working state of the electric heater, the communication direction of the four-way reversing valve and the working frequency of the compressor;

Further, the acquisition module 1101 is specifically configured to acquire the current indoor ambient temperature when the temperature of the water tank is less than the preset water tank temperature;

Further, the control module 1102 is specifically used for:

The defrost control device of the heat pump water heater provided in this embodiment is used to execute the technical solution of the processor in the heat pump water heater in any of the foregoing method embodiments. Its implementation principles and technical effects are similar and will not be described again here.

Figure 12 is a schematic structural diagram of a second embodiment of a defrost control device for a heat pump water heater provided by the present invention; as shown in Figure 12, the defrost control device 1100 of the heat pump water heater also includes:

Receiving module 1103: receives a heat recovery instruction, which is used to indicate entering the heat recovery mode;

The acquisition module 1101 is also used to acquire the heating operation time of the hot water heat exchanger based on the heat recovery instruction;

Further, the control module 1102 is also used to:

Further, the control module 1102 is specifically used for:

When the frost amount of the outdoor heat exchanger is greater than or equal to the preset frost amount, the heating circuits of all spaces acted upon by the heat pump water heater are controlled to be opened.

Further, the control module 1102 is specifically used for:

The acquisition module 1101 is also used to acquire the current temperature and current humidity in the first space;

Further, the control module 1102 is also configured to determine whether the heat recovery of the at least one space is completed based on the current temperature and the current humidity;

Figure 13 is a schematic structural diagram of the heat pump water heater provided by the present invention. As shown in Figure 13, the heat pump water heater 1300 includes:

Processor 1301, memory 1302, communication interface 1303, water tank 1304, and hot water heat exchanger 1305, electric heater 1306, compressor 1307, indoor heat exchanger 1308, and outdoor heat exchanger 1309 connected to the processor 1301 and control valve assembly 1310;

The control valve assembly 1310 includes a four-way reversing valve, a main control valve, a hot water control valve and a heating control valve;

The compressor 1307 is connected to the outdoor heat exchanger 1309 and the indoor heat exchanger 1308 respectively through the four-way reversing valve. The indoor heat exchanger 1308 is connected through the heating control valve, the hot water The control valve is connected to the hot water heat exchanger 1305. The hot water heat exchanger 1305 is connected to the water tank 1304 for heating the water tank 1304. The hot water heat exchanger 1305 passes the hot water. The control valve and the main control valve are connected to the outdoor heat exchanger 1309, and the electric heater 1306 is located in the water tank 1304 and is used to electrically heat the water tank 1304;

The memory 1302 is used to store executable instructions of the processor 1301;

The processor 1301 is configured to execute the technical solution of the processor in the heat pump water heater in any of the foregoing method embodiments by executing the executable instructions.

The processor 1301 is the defrost control device in the above device embodiment.

Optionally, the memory 1302 can be independent or integrated with the processor 1301.

Optionally, when the memory 1302 is a device independent of the processor 1301, the heat pump water heater 1300 may also include:

Bus, used to connect the above devices.

The heat pump water heater is used to implement the technical solution of the heat pump water heater in any of the foregoing method embodiments. Its implementation principles and technical effects are similar and will not be described again here.

Embodiments of the present invention also provide a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the technical solution provided by any of the foregoing method embodiments is implemented.

Embodiments of the present invention also provide a computer program product, including a computer program, which when executed by a processor is used to implement the technical solution provided by any of the foregoing method embodiments.

This embodiment also provides a chip. The chip includes a memory and a processor. Codes and data are stored in the memory. The memory is coupled to the processor. The processor runs the program in the memory so that the The chip is used to execute the defrost control method of the heat pump water heater provided in the above various embodiments.

This embodiment also provides a computer program, which, when executed by a processor, is used to execute the defrost control method of the heat pump water heater provided in the various embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims

A defrost control method for a heat pump water heater, applied to a processor in the heat pump water heater, characterized in that the heat pump water heater includes the processor, a water tank, and a hot water heat exchanger connected to the processor, Electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly; the control valve assembly includes a four-way reversing valve, main control valve, hot water control valve and heating control valve; the compressor The four-way reversing valve is connected to the outdoor heat exchanger and the indoor heat exchanger respectively, and the indoor heat exchanger exchanges with the hot water through the heating control valve and the hot water control valve. The heater is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger communicates with the outdoor exchanger through the hot water control valve and the main control valve. The heater is connected, and the electric heater is located in the water tank and used to electrically heat the water tank; the method includes:

When it is detected that the preset defrost conditions are met, obtain the temperature of the water tank;

According to the temperature of the water tank and the preset water tank temperature, the working status of each control valve in the compressor, the electric heater and the control valve assembly is controlled.
The method according to claim 1, characterized in that the operation of each control valve in the compressor, the electric heater and the control valve assembly is controlled according to the temperature of the water tank and the preset water tank temperature. status, including:

When the temperature of the water tank is greater than or equal to the preset water tank temperature, the first hot water opening of the hot water control valve, the first control opening of the main control valve, and the heating opening of the heating control valve are determined. degree, the working state of the electric heater, the communication direction of the four-way reversing valve and the working frequency of the compressor;

Control the hot water control valve to be at the first hot water opening, the main control valve to be at the first control opening, the heating control valve to be at the heating opening, and the electric heater to work at The working state, the four-way reversing valve is switched to the communication direction, and the compressor operates at the operating frequency.
The method according to claim 1 or 2, characterized in that, according to the temperature of the water tank and the preset water tank temperature, each control valve in the compressor, the electric heater and the control valve assembly is controlled. working status, including:

When the temperature of the water tank is less than the preset water tank temperature, obtain the current indoor ambient temperature;

Determine the second hot water opening of the hot water control valve according to the indoor ambient temperature;

Determine the second control opening of the main control valve, the heating opening of the heating control valve, the heating working state of the electric heater, the communication direction of the four-way reversing valve and the operation of the compressor frequency;

Control the hot water control valve to be at the second hot water opening, the main control valve to be at the second control opening, the heating control valve to be at the heating opening, and the electric heater to be in heating operation. state, the four-way reversing valve is switched to the communication direction, and the compressor operates at the operating frequency.
The method of claim 3, wherein determining the second hot water opening of the hot water control valve according to the indoor ambient temperature includes:

When the indoor ambient temperature is greater than or equal to the preset upper limit temperature value, determine the second hot water opening of the hot water control valve to be the first percentage;

When the indoor ambient temperature is less than or equal to the preset lower limit temperature value, determine the second hot water opening of the hot water control valve to be a second percentage;

When the indoor ambient temperature is greater than the preset lower limit temperature value and less than the preset upper limit temperature, determine the second hot water opening of the hot water control valve to be a third percentage;

Wherein, the preset lower limit temperature value is less than the preset upper limit temperature, and the third percentage is greater than the second percentage and less than the first percentage.
The method according to any one of claims 1 to 4, characterized in that the method further includes:

Receive a heat recovery instruction, which is used to indicate entering the heat recovery mode;

Based on the heat recovery instruction, obtain the heating operation time of the hot water heat exchanger;

Determine the frost information of the outdoor heat exchanger according to the heating operation time;

According to the frost information of the outdoor heat exchanger, the heating circuit of at least one space where the heat pump water heater acts is controlled to be opened, and the opening of the heating circuit is used to recover heat in the at least one space.
The method according to claim 5, wherein controlling the opening of the heating circuit of at least one space where the heat pump water heater acts based on the frost information of the outdoor heat exchanger includes:

When the frost amount of the outdoor heat exchanger is less than the preset frost amount, control the heating circuit of the first space where the heat pump water heater acts to open and the heating circuit of the second space where the heat pump water heater acts to close;

When the frost amount of the outdoor heat exchanger is greater than or equal to the preset frost amount, the heating circuits of all spaces acted upon by the heat pump water heater are controlled to be opened.
The method according to claim 5 or 6, characterized in that, the method further includes:

When the amount of frost in the outdoor heat exchanger is less than the preset amount of frost, determine the third hot water opening of the hot water control valve, the third control opening of the main control valve, and the heating control valve. The heating opening of the valve, the communication direction of the four-way reversing valve and the operating frequency of the compressor;

Control the hot water control valve to be at the third hot water opening, the main control valve to be at the third control opening, the heating control valve to be at the heating opening, the four-way reversing valve The direction of communication is reversed and the compressor operates at the operating frequency.
The method according to any one of claims 5 to 7, characterized in that the method further includes:

When the amount of frost in the outdoor heat exchanger is greater than or equal to the preset amount of frost, determine the fourth hot water opening of the hot water control valve, the fourth control opening of the main control valve, and the The heating opening of the heating control valve, the communication direction of the four-way reversing valve and the operating frequency of the compressor;

Control the hot water control valve to be at the fourth hot water opening, the main control valve to be at the fourth control opening, the heating control valve to be at the heating opening, the four-way reversing valve The direction of communication is reversed and the compressor operates at the operating frequency.
The method according to any one of claims 1 to 8, characterized in that the method further includes:

Obtain the current temperature and current humidity in the first space;

Determine whether the heat recovery of the at least one space is completed according to the current temperature and the current humidity;

When the heat recovery of the at least one space is completed, the heat recovery mode is exited.
A defrost control device for a heat pump water heater, integrated into a processor in the heat pump water heater, characterized in that the heat pump water heater includes the processor, a water tank, and a hot water heat exchanger connected to the processor, Electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly; the control valve assembly includes a four-way reversing valve, main control valve, hot water control valve and heating control valve; the compressor The four-way reversing valve is connected to the outdoor heat exchanger and the indoor heat exchanger respectively, and the indoor heat exchanger exchanges with the hot water through the heating control valve and the hot water control valve. The heater is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger communicates with the outdoor exchanger through the hot water control valve and the main control valve. The heater is connected, and the electric heater is located in the water tank and used to electrically heat the water tank; the device includes:

An acquisition module, used to acquire the temperature of the water tank when it is detected that the preset defrost conditions are met;

A control module used to control the working status of each control valve in the compressor, the electric heater and the control valve assembly according to the temperature of the water tank and the preset water tank temperature.
A heat pump water heater, which is characterized by including:

Processor, memory, communication interface, water tank, and hot water heat exchanger, electric heater, compressor, indoor heat exchanger, outdoor heat exchanger and control valve assembly connected to the processor;

The control valve assembly includes a four-way reversing valve, a main control valve, a hot water control valve and a heating control valve;

The compressor is connected to the outdoor heat exchanger and the indoor heat exchanger respectively through the four-way reversing valve, and the indoor heat exchanger is connected to the indoor heat exchanger through the heating control valve and the hot water control valve. The hot water heat exchanger is connected, and the hot water heat exchanger is connected to the water tank for heating the water tank. The hot water heat exchanger is connected with the hot water control valve and the main control valve through the hot water control valve and the main control valve. The outdoor heat exchanger is connected, and the electric heater is located in the water tank and used to electrically heat the water tank;

The memory is used to store executable instructions of the processor;

Wherein, the processor is the defrost control device described in claim 10 above.
A readable storage medium on which a computer program is stored, characterized in that when the computer program is executed by a processor, the defrost control method of a heat pump water heater according to any one of claims 1 to 9 is implemented.
A computer program product, characterized by comprising a computer program, which when executed by a processor is used to implement the defrost control method of a heat pump water heater according to any one of claims 1 to 9.
A chip, characterized in that the chip includes a memory and a processor, codes and data are stored in the memory, the memory is coupled to the processor, and the processor runs the program in the memory so that the The chip is used to execute the defrost control method of the heat pump water heater according to any one of the above claims 1 to 9.
A computer program, characterized in that when the computer program is executed by a processor, it is used to execute the defrost control method of the heat pump water heater according to any one of claims 1 to 9.