Dynamic heat distribution air conditioner heat pump host and control method thereof

Abstract

This invention discloses a dynamic heat distribution air conditioning heat pump unit. The compressor outlet is connected to the inlet of a three-way valve. The first outlet of the three-way valve is connected to the inlet of a heating coil in a domestic hot water tank. The outlet of the heating coil and the second outlet of the three-way valve are both connected to the first port of a four-way valve. The second port of the four-way valve is connected to the first port of an indoor heat exchanger. The fourth port of the four-way valve is connected to a second regulating valve assembly. The second regulating valve assembly is connected to an outdoor heat exchanger. The outdoor heat exchanger is connected to a first regulating valve assembly. The second port of the first regulating valve assembly is connected to the second port of the indoor heat exchanger. This invention has the advantages of recovering some heat and processing the remaining heat by the outdoor heat exchanger when there is sufficient waste heat; and supplementing the ambient heat through the outdoor heat exchanger when there is insufficient waste heat, thereby forming a heat balance operation mechanism of waste heat recovery, ambient heat compensation, and dynamic heat distribution.

Description

Technical Field

[0001] This invention relates to the field of heat pump air conditioning and integrated utilization of domestic hot water technology, and particularly to a dynamic heat distribution air conditioning heat pump host and its control method. Background Technology

[0002] In cooling mode, the high-temperature and high-pressure refrigerant discharged by the compressor of an air source heat pump air conditioner releases heat into the environment in the outdoor heat exchanger. A considerable portion of this heat is directly discharged into the atmosphere and is not effectively utilized.

[0003] Integrating the domestic hot water production function with the heat pump air conditioning function to form a "tri-supply" system can recover the condensation waste heat under the cooling condition to heat domestic hot water, thereby improving the overall energy utilization efficiency.

[0004] The existing combined heat and power (CHP) system has the following technical problems in actual operation: The mode switching is obvious, and it is difficult to meet both cooling and heating loads. Some tri-generation systems mainly rely on switching between air conditioning mode and hot water mode, which makes it difficult to stably meet both air conditioning load and domestic hot water load for a long time. This affects both user experience and system energy efficiency. Waste heat utilization is constrained by the air conditioning load. When the air conditioning cooling load is small, there is insufficient waste heat available on the condenser side, the heating capacity of domestic hot water decreases, the hot water heating rate slows down, and it may even fail to reach the set temperature. Sudden changes in hot water load may impact the air conditioning side. When the demand for domestic hot water suddenly increases, if the heating capacity of hot water is simply increased, according to the law of conservation of energy, the refrigerant will need to absorb more heat in the indoor unit of the air conditioner, which will cause the air conditioning cooling side to become too cold, or even cause frost to form and shut down. When the demand for domestic hot water decreases, if the heating capacity of hot water is simply reduced, the air conditioning cooling capacity will decrease, the system condensing pressure will increase, and the operational stability will deteriorate. Excess heat is difficult to dynamically absorb. When the domestic hot water load is small, the condenser side still needs to release a large amount of heat to the environment. If the heat recovery branch participates in too much heat, it is easy to cause risks such as increased condensing pressure, excessively high compressor discharge temperature, decreased system efficiency, or even high-pressure protection shutdown. The outdoor heat exchanger has a single function. In existing systems, the outdoor heat exchanger usually only operates as a condenser or evaporator. Its heat exchange role is fixed by the four-way valve and cannot be flexibly adjusted according to the heat surplus or deficit on the hot water side to participate in heat balance. Summary of the Invention

[0005] The purpose of this invention is to provide a dynamic heat distribution air conditioning heat pump unit and its control method. Within the same heat pump refrigerant system, through dynamic adjustment of the compressor's exhaust side via a three-way flow divider and the first and second regulating valve assemblies on both sides of the outdoor heat exchanger, heat can be dynamically switched between three directions: domestic hot water utilization, environmental heat release, and environmental heat absorption. When waste heat is sufficient, some heat is recovered and the remaining heat is processed by the outdoor heat exchanger; when waste heat is insufficient, environmental heat is supplemented through the outdoor heat exchanger, thus forming a heat balance operation mechanism that integrates waste heat recovery, environmental heat compensation, and dynamic heat distribution.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A dynamic heat distribution air conditioning heat pump unit includes a compressor, a three-way valve, a domestic hot water tank, a four-way valve, an indoor heat exchanger, a first regulating valve assembly, an outdoor heat exchanger, and a second regulating valve assembly. The compressor's outlet is connected to the inlet of a three-way valve. The first outlet of the three-way valve is connected to the inlet of a heating coil in the domestic hot water tank. The outlet of the heating coil and the second outlet of the three-way valve are both connected to the first port of a four-way valve. The second port of the four-way valve is connected to the first port of the indoor heat exchanger. The third port of the four-way valve is connected to the compressor's inlet. The fourth port of the four-way valve is connected to the first port of a second regulating valve assembly. The second port of the second regulating valve assembly is connected to the first port of an outdoor heat exchanger. The second port of the outdoor heat exchanger is connected to the first port of a first regulating valve assembly. The second port of the first regulating valve assembly is connected to the second port of an indoor heat exchanger. The first regulating valve assembly includes a first electronic expansion valve and a normally closed solenoid two-way valve placed in parallel. The second regulating valve assembly includes a second electronic expansion valve and a normally open solenoid two-way valve placed in parallel.

[0007] A control method for a dynamic heat distribution air conditioning heat pump unit includes the following steps: S1. Select the air conditioner's operating mode: heating mode or cooling mode; S2. Is there a need for domestic hot water? If there is no demand for domestic hot water in S3 heating or cooling mode, then it will operate in normal heating or cooling mode. S4. In heating mode, if there is a demand for domestic hot water, the system will switch to heating plus domestic hot water mode. S5. In cooling mode, there is a demand for domestic hot water, including a mode with sufficient domestic hot water waste heat and a mode with insufficient domestic hot water waste heat.

[0008] The preferred option is as follows: Preferably, in step S1, the specific working method of the heating mode is as follows; The first port of the three-way valve is closed and the second port is open. The second electronic expansion valve is closed and the normally open solenoid two-way valve remains open. The first electronic expansion valve is working and the normally closed solenoid two-way valve remains closed. When the compressor is working, the high-temperature and high-pressure gaseous refrigerant flows to the three-way valve, enters the first port of the four-way valve through the second outlet of the three-way valve, and then enters the indoor heat exchanger through the second port of the four-way valve. After heat exchange in the indoor heat exchanger, the medium-temperature, high-pressure liquid refrigerant enters the first electronic expansion valve, then becomes a low-temperature, low-pressure liquid refrigerant, and continues to flow to the outdoor heat exchanger. After heat exchange in the outdoor heat exchanger, it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve, then enters the fourth port of the four-way valve, and finally enters the compressor through the third port of the four-way valve, thus completing the cycle.

[0009] Preferred: In step S1, the specific working mode of the cooling mode is as follows; The first port of the three-way valve is closed and the second port is open. The second electronic expansion valve is closed and the normally open solenoid two-way valve remains open. The first electronic expansion valve is working and the normally closed solenoid two-way valve remains closed. When the compressor is working, the high-temperature and high-pressure gaseous refrigerant flows to the three-way valve, enters the first port of the four-way valve through the second outlet of the three-way valve, and then enters the outdoor heat exchanger through the fourth port of the four-way valve and the normally open solenoid two-way valve. After heat exchange in the outdoor heat exchanger, the high-temperature, high-pressure gaseous refrigerant becomes a medium-temperature, high-pressure liquid refrigerant, which then enters the first electronic expansion valve. After passing through the first electronic expansion valve, the medium-temperature, high-pressure liquid refrigerant becomes a low-temperature, low-pressure liquid refrigerant, and then flows to the indoor heat exchanger for heat exchange. After heat exchange in the indoor heat exchanger, the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve and enters the compressor through the third port of the four-way valve, where it continues to work in a cycle.

[0010] Preferred method: In step S4, the specific working mode of the heating plus domestic hot water mode is as follows; Both the first and second ports of the three-way valve are open for dynamic adjustment; the second electronic expansion valve is closed, the normally open solenoid two-way valve remains open, the first electronic expansion valve is working, and the normally closed solenoid two-way valve remains closed. When the compressor is working, the high-temperature, high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank through the first port of the three-way valve to heat the domestic hot water, and then enters the first port of the four-way valve; It enters the first port of the four-way valve through the second outlet of the three-way valve, and then enters the indoor heat exchanger through the second port of the four-way valve. After heat exchange in the indoor heat exchanger, the medium-temperature, high-pressure liquid refrigerant enters the first electronic expansion valve, then becomes a low-temperature, low-pressure liquid refrigerant, and continues to flow to the outdoor heat exchanger. After heat exchange in the outdoor heat exchanger, it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve, then enters the fourth port of the four-way valve, and finally enters the compressor through the third port of the four-way valve, thus completing the cycle.

[0011] Preferred: In step S5, the specific working mode of the domestic hot water waste heat sufficient operation mode in the cooling mode is as follows; Both the first and second ports of the three-way valve are open for dynamic adjustment; the second electronic expansion valve is closed, the normally open solenoid two-way valve remains open, the first electronic expansion valve is working, and the normally closed solenoid two-way valve remains closed. When the compressor is working, the high-temperature, high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank through the first port of the three-way valve to heat the domestic hot water, and then enters the first port of the four-way valve; It enters the first port of the four-way valve through the second outlet of the three-way valve, and then enters the outdoor heat exchanger through the fourth port of the four-way valve and the normally open solenoid two-way valve. After heat exchange in the outdoor heat exchanger, the high-temperature, high-pressure gaseous refrigerant becomes a medium-temperature, high-pressure liquid refrigerant, which then enters the first electronic expansion valve. After passing through the first electronic expansion valve, the medium-temperature, high-pressure liquid refrigerant becomes a low-temperature, low-pressure liquid refrigerant, and then flows to the indoor heat exchanger for heat exchange. After heat exchange in the indoor heat exchanger, the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve and enters the compressor through the third port of the four-way valve, where it continues to work in a cycle.

[0012] Preferred: In step S5, the specific working mode of the operating mode where the domestic hot water waste heat is insufficient in the cooling mode is as follows; The first port of the three-way valve is open and the second port is closed; the second electronic expansion valve is open and the normally open solenoid two-way valve is closed; the first electronic expansion valve is closed and the normally closed solenoid two-way valve is open. When the compressor is working, the high-temperature, high-pressure gaseous refrigerant flows to the first port of the three-way valve; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank through the first port of the three-way valve to heat the domestic hot water. Then it enters the first port of the four-way valve, and then through the fourth port of the four-way valve, it enters the second electronic expansion valve and becomes a low-temperature and low-pressure liquid refrigerant. After entering the outdoor heat exchanger, the refrigerant absorbs heat from the air and becomes a medium-low temperature, low-pressure liquid refrigerant. Then, it enters the normally closed solenoid two-way valve. Then, it flows to the indoor heat exchanger for heat exchange; After heat exchange in the indoor heat exchanger, the medium-low temperature and low-pressure liquid refrigerant becomes a medium-low temperature and low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve and enters the compressor through the third port of the four-way valve to work in a cycle.

[0013] In summary, the present invention has the following beneficial effects: 1. By setting up a three-way valve, the compressor outlet can be divided into a domestic hot water branch and an air conditioning operation branch, and the distribution ratio can be dynamically adjusted according to the hot water demand and air conditioning load, so that the heat on the hot water side and the air conditioning side can be distributed in an adjustable manner. 2. By setting up a first electronic expansion valve and a normally closed solenoid two-way valve in parallel in the first regulating valve assembly, and a second electronic expansion valve and a normally open solenoid two-way valve in parallel in the second regulating valve assembly, the outdoor heat exchanger can flexibly switch between the roles of condenser and evaporator. This not only dissipates excess condensation heat, but also absorbs heat from the ambient air to compensate for insufficient heat, thus achieving the effect of waste heat recovery and ambient heat supplementation. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the heating mode of an embodiment; Figure 2 This is a flowchart illustrating the cooling mode of an embodiment; Figure 3 This is a flowchart illustrating the heating and domestic hot water supply mode of an embodiment. Figure 4 This is a flowchart illustrating the operation mode of sufficient waste heat from domestic hot water in the cooling mode of the embodiment. Figure 5 This is a flowchart illustrating the operation mode of insufficient waste heat from domestic hot water under the cooling mode of this embodiment.

[0015] In the diagram, 1. Compressor; 2. Three-way valve; 3. Domestic hot water tank; 4. Four-way valve; 5. Indoor heat exchanger; 6. First regulating valve assembly; 7. Outdoor heat exchanger; 8. Second regulating valve assembly; 9. First electronic expansion valve; 10. Normally closed solenoid two-way valve; 11. Second electronic expansion valve; 12. Normally open solenoid two-way valve. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Identical components are indicated by the same reference numerals.

[0018] A dynamic heat distribution air conditioning heat pump unit, such as Figure 1 As shown, it includes compressor 1, three-way valve 2, domestic hot water tank 3, four-way valve 4, indoor heat exchanger 5, first regulating valve assembly 6, outdoor heat exchanger 7, and second regulating valve assembly 8. The air conditioning heat pump unit is also equipped with a controller, which is electrically connected to the compressor 1, the three-way valve 2, the first regulating valve assembly 6, and the second regulating valve assembly 8 respectively; Three-way valve 2 is an adjustable proportional three-way flow divider valve with one common inlet and two outlet branches, namely the first outlet end and the second outlet end. Three-way valve 2 can continuously adjust the flow distribution ratio between the first outlet end and the second outlet end, with a distribution ratio range of 0 to 100%. The controller can output a 0-10V or 4-20mA opening control signal to three-way valve 2 according to the operating conditions to achieve stepless flow distribution regulation. Three-way valve 2 is existing technology and will not be described in detail here.

[0019] The dynamic allocation of three-way valve 2 satisfies the following control logic: The distribution ratio of the heat recovery branch of the three-way valve 2 is denoted as η, where η is the proportion of the refrigerant flow entering the heating coil to the total discharge volume of compressor 1, and the value range of η is 0≤η≤1. Using hot water temperature deviation = target temperature minus actual temperature ΔTw = Twt-Tw, air conditioning load deviation = indoor return air temperature minus set temperature ΔTa = Tar-Tas, and exhaust pressure P_d as control inputs, and η as control output, the target η value is calculated by segmented control or closed-loop proportional-integral control. The segmented control includes at least the following rules: When the hot water temperature deviation is greater than the first threshold ΔTw>ΔTw1, the exhaust pressure is lower than the high-pressure safety threshold Pd<PdH, and the air conditioning load deviation is less than the first threshold ΔTa<ΔTa1, the upper limit of the allocation ratio η=η_max, where ΔTw1 is the first hot water deviation threshold of 5℃, PdH is the high-pressure side safety threshold of 2.5MPa, ΔTa1 is the first air conditioning load deviation threshold of 1℃, and η_max is the upper limit of the allocation ratio of 0.85, which is suitable for the operation mode of insufficient domestic hot water waste heat; When the hot water temperature deviation is less than the second threshold ΔTw < ΔTw2, or the air conditioning load deviation is greater than the second threshold ΔTa > ΔTa2, or the exhaust pressure exceeds the high-pressure safety threshold Pd > PdH, η = η_min, where ΔTw2 is the second hot water deviation threshold of 1℃ and ΔTw2 < ΔTw1, ΔTa2 is the second air conditioning load deviation threshold of 3℃ and ΔTa2 > ΔTa1, and η_min is the lower limit of the allocation ratio of 0 or 0.05, which is applicable to the domestic hot water waste heat sufficient operation mode; When in the transitional range between the above two, η continuously adjusts between ηmin and ηmax with positive correlation to ΔTw, negative correlation to ΔTa, and negative correlation to P_d; η changes with a positive correlation to the hot water temperature deviation ΔTw, the more the hot water is lacking heat, the larger η is; η changes with a negative correlation to the air conditioning load deviation ΔTa, the more the air conditioning is lacking cooling, the smaller η is; η changes with a negative correlation to the exhaust pressure P_d, the higher the high pressure, the smaller η is, in order to avoid the heat recovery from exacerbating the increase in condensing pressure.

[0020] The target η value of the linear adjustment region can be calculated using the following formula: η=ηmin+Kw×(ΔTw-ΔTw2)-Ka×(ΔTa-ΔTa1)-Kp×(Pd-PdL) Where Kw, Ka, and Kp are the hot water temperature deviation gain coefficient, air conditioning load deviation gain coefficient, and exhaust pressure gain coefficient, respectively, and PdL is the low-pressure reference threshold. When the calculation result exceeds the range [ηmin, ηmax], the output is limited to the corresponding boundary value.

[0021] The control output of η is also linked to the frequency of compressor 1: when the frequency of compressor 1 increases and the total exhaust volume increases, η is appropriately increased to utilize more high-grade exhaust heat; when the frequency of compressor 1 decreases and the total exhaust volume decreases, η is appropriately decreased to ensure the basic flow rate on the air conditioning side.

[0022] In the heating plus domestic hot water mode, the control logic of η is the same as above, except that the judgment direction of the air conditioning load deviation ΔT_a is reversed. That is, the greater the indoor heating demand, the smaller η is, so as to give priority to ensuring the indoor heating capacity.

[0023] The outlet end of the compressor 1 is connected to the inlet end of the three-way valve 2. The first outlet end of the three-way valve 2 is connected to the inlet end of the heating coil in the domestic hot water tank 3. The outlet end of the heating coil and the second outlet end of the three-way valve 2 are both connected to the first port of the four-way valve 4. The second port of the four-way valve 4 is connected to the first port of the indoor heat exchanger 5. The third port of the four-way valve 4 is connected to the inlet end of the compressor 1. The fourth port of the four-way valve 4 is connected to the first port of the second regulating valve assembly 8. The second port of the second regulating valve assembly 8 is connected to the first port of the outdoor heat exchanger 7. The second port of the outdoor heat exchanger 7 is connected to the first port of the first regulating valve assembly 6. The second port of the first regulating valve assembly 6 is connected to the second port of the indoor heat exchanger 5. The first regulating valve assembly 6 includes a first electronic expansion valve 9 and a normally closed solenoid two-way valve 10 placed in parallel. The second regulating valve assembly 8 includes a second electronic expansion valve 11 and a normally open solenoid two-way valve 12 placed in parallel.

[0024] A control method for a dynamic heat distribution air conditioning heat pump unit, such as Figures 1-5 As shown, the operation steps are as follows: S1. Select the air conditioner's operating mode: heating mode or cooling mode; S2. Is there a need for domestic hot water? If there is no demand for domestic hot water in S3 heating or cooling mode, then it will operate in normal heating or cooling mode. S4. In heating mode, if there is a demand for domestic hot water, the system will switch to heating plus domestic hot water mode. S5. In cooling mode, there is a demand for domestic hot water, including a mode with sufficient domestic hot water waste heat and a mode with insufficient domestic hot water waste heat.

[0025] The controller determines whether the current heat on the condenser side can meet the domestic hot water demand based on the domestic hot water temperature deviation ΔTw=Twt-Tw, the compressor 1 discharge pressure Pd, and the air conditioning load status.

[0026] The judgment logic is as follows: When ΔTw ≤ the first threshold of 2℃ and Pd ≤ the upper pressure threshold of 2.8MPa, it is determined that the residual heat is sufficient and enters the domestic hot water residual heat sufficient operation mode. When ΔTw > the second threshold of 5℃ or Pd < the lower pressure threshold of 1.5MPa, it is determined that the residual heat is insufficient and enters the domestic hot water residual heat insufficient operation mode. When ΔTw is between the first threshold and the second threshold, the current operating mode is maintained to avoid frequent switching.

[0027] The specific working principle of the heating mode is as follows: The first port of the three-way valve 2 is closed and the second port is open; the second electronic expansion valve 11 is closed and the normally open solenoid two-way valve 12 remains open; the first electronic expansion valve 9 is working and the normally closed solenoid two-way valve 10 remains closed. When compressor 1 is working, the high-temperature and high-pressure gaseous refrigerant flows to three-way valve 2, enters the first port of four-way valve 4 through the second outlet end of three-way valve 2, and then enters the indoor heat exchanger 5 through the second port of four-way valve 4. After heat exchange in the indoor heat exchanger 5, the medium-temperature, high-pressure liquid refrigerant enters the first electronic expansion valve 9, and then becomes a low-temperature, low-pressure liquid refrigerant, which continues to flow to the outdoor heat exchanger 7. After heat exchange in the outdoor heat exchanger 7, it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve 12, and then enters the fourth port of the four-way valve 4. It then enters the compressor 1 through the third port of the four-way valve 4 and continues to work in a cycle.

[0028] The specific working principle of the cooling mode is as follows: The first port of the three-way valve 2 is closed and the second port is open; the second electronic expansion valve 11 is closed and the normally open solenoid two-way valve 12 remains open; the first electronic expansion valve 9 is working and the normally closed solenoid two-way valve 10 remains closed. When compressor 1 is working, the high-temperature and high-pressure gaseous refrigerant flows to three-way valve 2, enters the first port of four-way valve 4 through the second outlet end of three-way valve 2, and then enters the outdoor heat exchanger 7 through the fourth port of four-way valve 4 and normally open electromagnetic two-way valve 12. After heat exchange in the outdoor heat exchanger 7, the high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and high-pressure liquid refrigerant, and then enters the first electronic expansion valve 9. After passing through the first electronic expansion valve 9, the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant, and then flows to the indoor heat exchanger 5 for heat exchange. After heat exchange in the indoor heat exchanger 5, the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve 4 and enters the compressor 1 through the third port of the four-way valve 4, where it operates in a cycle.

[0029] The specific working principle of the heating plus domestic hot water mode is as follows: Both the first and second ports of the three-way valve 2 are open for dynamic adjustment; the second electronic expansion valve 11 is closed, the normally open solenoid two-way valve 12 remains open, the first electronic expansion valve 9 is working, and the normally closed solenoid two-way valve 10 remains closed. When compressor 1 is working, the high-temperature and high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve 2; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank 3 through the first port of the three-way valve 2 to heat the domestic hot water, and then enters the first port of the four-way valve 4; It enters the first port of the four-way valve 4 through the second outlet end of the three-way valve 2, and then enters the indoor heat exchanger 5 through the second port of the four-way valve 4; After heat exchange in the indoor heat exchanger 5, the medium-temperature, high-pressure liquid refrigerant enters the first electronic expansion valve 9, and then becomes a low-temperature, low-pressure liquid refrigerant, which continues to flow to the outdoor heat exchanger 7. After heat exchange in the outdoor heat exchanger 7, it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve 12, and then enters the fourth port of the four-way valve 4. It then enters the compressor 1 through the third port of the four-way valve 4 and continues to work in a cycle.

[0030] In cooling mode, the specific working method of the domestic hot water waste heat sufficient operation mode is as follows: Both the first and second ports of the three-way valve 2 are open for dynamic adjustment; the second electronic expansion valve 11 is closed, the normally open solenoid two-way valve 12 remains open, the first electronic expansion valve 9 is working, and the normally closed solenoid two-way valve 10 remains closed. When compressor 1 is working, the high-temperature and high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve 2; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank 3 through the first port of the three-way valve 2 to heat the domestic hot water, and then enters the first port of the four-way valve 4; It enters the first port of the four-way valve 4 through the second outlet of the three-way valve 2, and then enters the outdoor heat exchanger 7 through the fourth port of the four-way valve 4 and the normally open solenoid two-way valve 12. After heat exchange in the outdoor heat exchanger 7, the high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and high-pressure liquid refrigerant, and then enters the first electronic expansion valve 9. After passing through the first electronic expansion valve 9, the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant, and then flows to the indoor heat exchanger 5 for heat exchange. After heat exchange in the indoor heat exchanger 5, the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve 4 and enters the compressor 1 through the third port of the four-way valve 4, where it operates in a cycle.

[0031] In cooling mode, the specific operating mode for the insufficient residual heat of domestic hot water is as follows: The first port of the three-way valve 2 is open and the second port is closed; the second electronic expansion valve 11 is open and the normally open solenoid two-way valve 12 is closed; the first electronic expansion valve 9 is closed and the normally closed solenoid two-way valve 10 is open. When compressor 1 is working, the high-temperature and high-pressure gaseous refrigerant flows to the first port of three-way valve 2; High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank 3 through the first port of the three-way valve 2 to heat the domestic hot water. Then it enters the first port of the four-way valve 4, and then enters the second electronic expansion valve 11 through the fourth port of the four-way valve 4, becoming a low-temperature and low-pressure liquid refrigerant. After entering the outdoor heat exchanger 7, the refrigerant absorbs heat from the air and becomes a medium-low temperature and low pressure liquid refrigerant. Then, it enters the normally closed solenoid two-way valve 10. Then, it flows to the indoor heat exchanger 5 for heat exchange; After heat exchange in the indoor heat exchanger 5, the medium-low temperature and low-pressure liquid refrigerant becomes a medium-low temperature and low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve 4 and enters the compressor 1 through the third port of the four-way valve 4, and works in a cycle.

[0032] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A dynamic heat distribution air conditioning heat pump unit, characterized in that: Includes compressor (1), three-way valve (2), domestic hot water tank (3), four-way valve (4), indoor heat exchanger (5), first regulating valve assembly (6), outdoor heat exchanger (7), second regulating valve assembly (8); The outlet end of the compressor (1) is connected to the inlet end of the three-way valve (2). The first outlet end of the three-way valve (2) is connected to the inlet end of the heating coil in the domestic hot water tank (3). The outlet end of the heating coil and the second outlet end of the three-way valve (2) are both connected to the first port of the four-way valve (4). The second port of the four-way valve (4) is connected to the first port of the indoor heat exchanger (5). The third port of the four-way valve (4) is connected to the inlet end of the compressor (1). The fourth port of the four-way valve (4) is connected to the first port of the second regulating valve assembly (8). The second port of the second regulating valve assembly (8) is connected to the first port of the outdoor heat exchanger (7). The second port of the outdoor heat exchanger (7) is connected to the first port of the first regulating valve assembly (6). The second port of the first regulating valve assembly (6) is connected to the second port of the indoor heat exchanger (5). The first regulating valve assembly (6) includes a first electronic expansion valve (9) and a normally closed solenoid two-way valve (10) placed in parallel. The second regulating valve assembly (8) includes a second electronic expansion valve (11) and a normally open solenoid two-way valve (12) placed in parallel.

2. A control method for a dynamic heat distribution air conditioning heat pump main unit, used in a dynamic heat distribution air conditioning heat pump main unit as described in claim 1, characterized in that, The following steps are included: S1. Select the air conditioner's operating mode: heating mode or cooling mode; S2. Is there a need for domestic hot water? If there is no demand for domestic hot water in S3 heating or cooling mode, then it will operate in normal heating or cooling mode. S4. In heating mode, if there is a demand for domestic hot water, the system will switch to heating plus domestic hot water mode. S5. In cooling mode, there is a demand for domestic hot water, including a mode with sufficient domestic hot water waste heat and a mode with insufficient domestic hot water waste heat.

3. The control method for a dynamic heat distribution air conditioning heat pump main unit according to claim 2, characterized in that: In step S1, the specific working method of the heating mode is as follows; The first port of the three-way valve (2) is closed and the second port is open. The second electronic expansion valve (11) is closed and the normally open solenoid two-way valve (12) remains open. The first electronic expansion valve (9) is working and the normally closed solenoid two-way valve (10) remains closed. When the compressor (1) is working, the high-temperature and high-pressure gaseous refrigerant flows to the three-way valve (2), enters the first port of the four-way valve (4) through the second outlet end of the three-way valve (2), and then enters the indoor heat exchanger (5) through the second port of the four-way valve (4). After heat exchange in the indoor heat exchanger (5), the medium-temperature and high-pressure liquid refrigerant enters the first electronic expansion valve (9), and then becomes a low-temperature and low-pressure liquid refrigerant, which continues to flow to the outdoor heat exchanger (7). After heat exchange in the outdoor heat exchanger (7), it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve (12) and then enters the fourth port of the four-way valve (4). It then enters the compressor (1) through the third port of the four-way valve (4) and works in a cycle.

4. The control method for a dynamic heat distribution air conditioning heat pump main unit according to claim 2, characterized in that: In step S1, the specific working method of the cooling mode is as follows; The first port of the three-way valve (2) is closed and the second port is open. The second electronic expansion valve (11) is closed and the normally open solenoid two-way valve (12) remains open. The first electronic expansion valve (9) is working and the normally closed solenoid two-way valve (10) remains closed. When the compressor (1) is working, the high-temperature and high-pressure gaseous refrigerant flows to the three-way valve (2), enters the first port of the four-way valve (4) through the second outlet end of the three-way valve (2), and then enters the outdoor heat exchanger (7) through the fourth port of the four-way valve (4) and the normally open electromagnetic two-way valve (12). After heat exchange in the outdoor heat exchanger (7), the high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and high-pressure liquid refrigerant, and then enters the first electronic expansion valve (9). After passing through the first electronic expansion valve (9), the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant, and then flows to the indoor heat exchanger (5) for heat exchange; After heat exchange in the indoor heat exchanger (5), the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve (4) and enters the compressor (1) through the third port of the four-way valve (4) for cyclic operation.

5. The control method for a dynamic heat distribution air conditioning heat pump main unit according to claim 3, characterized in that: In step S4, the specific working method of the heating plus domestic hot water mode is as follows: The first and second ports of the three-way valve (2) are both open for dynamic adjustment; the second electronic expansion valve (11) is closed, the normally open solenoid two-way valve (12) remains open, the first electronic expansion valve (9) is working, and the normally closed solenoid two-way valve (10) remains closed; When the compressor (1) is working, the high-temperature and high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve (2); High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank (3) through the first port of the three-way valve (2) to heat the domestic hot water, and then enters the first port of the four-way valve (4); It enters the first port of the four-way valve (4) through the second outlet end of the three-way valve (2), and then enters the indoor heat exchanger (5) through the second port of the four-way valve (4). After heat exchange in the indoor heat exchanger (5), the medium-temperature and high-pressure liquid refrigerant enters the first electronic expansion valve (9), and then becomes a low-temperature and low-pressure liquid refrigerant, which continues to flow to the outdoor heat exchanger (7). After heat exchange in the outdoor heat exchanger (7), it becomes a medium-temperature, low-pressure gaseous refrigerant. It passes through the normally open solenoid two-way valve (12) and then enters the fourth port of the four-way valve (4). It then enters the compressor (1) through the third port of the four-way valve (4) and works in a cycle.

6. The control method for a dynamic heat distribution air conditioning heat pump main unit according to claim 4, characterized in that: In step S5, the specific working mode of the domestic hot water waste heat sufficient operation mode in the cooling mode is as follows: The first and second ports of the three-way valve (2) are both open for dynamic adjustment; the second electronic expansion valve (11) is closed, the normally open solenoid two-way valve (12) remains open, the first electronic expansion valve (9) is working, and the normally closed solenoid two-way valve (10) remains closed; When the compressor (1) is working, the high-temperature and high-pressure gaseous refrigerant flows to the first and second ports of the three-way valve (2); High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank (3) through the first port of the three-way valve (2) to heat the domestic hot water, and then enters the first port of the four-way valve (4); It enters the first port of the four-way valve (4) through the second outlet end of the three-way valve (2), and then enters the outdoor heat exchanger (7) through the fourth port of the four-way valve (4) and the normally open electromagnetic two-way valve (12). After heat exchange in the outdoor heat exchanger (7), the high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and high-pressure liquid refrigerant, and then enters the first electronic expansion valve (9). After passing through the first electronic expansion valve (9), the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant, and then flows to the indoor heat exchanger (5) for heat exchange; After heat exchange in the indoor heat exchanger (5), the low-temperature, low-pressure liquid refrigerant becomes a medium-temperature, low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve (4) and enters the compressor (1) through the third port of the four-way valve (4) for cyclic operation.

7. The control method for a dynamic heat distribution air conditioning heat pump main unit according to claim 4, characterized in that: In step S5, the specific working mode of the insufficient residual heat operation mode of domestic hot water in cooling mode is as follows: The first port of the three-way valve (2) is open and the second port is closed; the second electronic expansion valve (11) is open and the normally open solenoid two-way valve (12) is closed; the first electronic expansion valve (9) is closed and the normally closed solenoid two-way valve (10) is open. When the compressor (1) is working, the high-temperature and high-pressure gaseous refrigerant flows to the first port of the three-way valve (2); High-temperature and high-pressure gaseous refrigerant enters the heating coil in the domestic hot water tank (3) through the first port of the three-way valve (2) to heat the domestic hot water, and then enters the first port of the four-way valve (4), and then enters the second electronic expansion valve (11) through the fourth port of the four-way valve (4) to become a low-temperature and low-pressure liquid refrigerant; After entering the outdoor heat exchanger (7) and exchanging heat through the outdoor heat exchanger (7), the refrigerant absorbs heat from the air and the low-temperature, low-pressure liquid refrigerant becomes a medium-low-temperature, low-pressure liquid refrigerant. Then, it enters the normally closed solenoid two-way valve (10). Then, it flows to the indoor heat exchanger (5) for heat exchange; After heat exchange in the indoor heat exchanger (5), the medium-low temperature and low-pressure liquid refrigerant becomes a medium-low temperature and low-pressure gaseous refrigerant, which then flows to the second port of the four-way valve (4) and enters the compressor (1) through the third port of the four-way valve (4) for cyclic operation.

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