Air source heat pump unit with peak-valley electricity control strategy and control method of air source heat pump unit

Abstract

The invention relates to an air source heat pump unit with a peak-valley electricity control strategy and a control method thereof. The air source heat pump unit comprises a four-way valve, a compressor assembly, an evaporator, a heat exchanger, an energy storage water tank, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a sixth electromagnetic valve. A port a, a port b, a port c and a port d are formed in the four-way valve, an inlet of the compressor assembly is communicated with the port b of the four-way valve, an outlet of the compressor assembly is communicated with the port d of the four-way valve, and an outlet of the evaporator is communicated with the port c of the four-way valve. The method has the advantages that the air source heat pump unit with the peak-valley electricity control strategy can make proper operation logic according to the peak-valley electricity price of the state grid, the heat storage property of the air source heat pump is utilized to the maximum extent, valley electricity is utilized to the maximum extent for heating, and the purposes of reducing the operation cost, balancing the load of the grid and reducing carbon emission are achieved while the heat utilization requirements of customers are met.

Description

Technical Field

[0001] The invention relates to an air source heat pump unit with a peak-valley electricity control strategy and a control method thereof. Background Art

[0002] At present, air source heat pump water heaters, heating units or swimming pool heat pumps are all heat-generating and heat-storage equipment, but they cannot effectively combine the peak and valley electricity prices of the national grid to make energy storage control, and cannot achieve the purpose of energy saving and money saving; how to make the air source heat pump make appropriate control strategies according to the peak and valley electricity prices of the national grid, so as to reduce the operating costs of the air source heat pump operation, has become a difficult problem for discussion in the industry. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an air source heat pump unit with a peak-valley electricity control strategy and a control method thereof. The air source heat pump unit with a peak-valley electricity control strategy can make appropriate operating logic according to the peak-valley electricity prices of the national power grid, maximize the use of the heat storage properties of the air source heat pump, and maximize the use of valley electricity for heating, thereby meeting the customer's heating needs while achieving the goals of reducing operating costs, balancing the grid load, and reducing carbon emissions.

[0004] In order to achieve the above object, the first technical solution of the present invention is implemented as follows: it is an air source heat pump unit with a peak-valley power control strategy, characterized in that it includes: A four-way valve; the four-way valve is provided with ports a, b, c and d, the a port is connected to the d port, and the b port is connected to the c port; A compressor assembly and an evaporator; the inlet of the compressor assembly is connected to the port b of the four-way valve, the outlet of the compressor assembly is connected to the port d of the four-way valve, and the outlet of the evaporator is connected to the port c of the four-way valve; A heat exchanger and an energy storage water tank; a heat exchange tube is provided in the heat exchanger, and an energy storage tube is provided in the energy storage water tank, and the outlet of the heat exchange tube and the outlet of the energy storage tube are respectively connected to the inlet of the evaporator; a first solenoid valve and a second solenoid valve; port a of the four-way valve is connected to the inlet of the heat exchange tube through the first solenoid valve, and port a of the four-way valve is connected to the inlet of the energy storage tube through the second solenoid valve; and The third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the sixth solenoid valve; the water outlet of the energy storage water tank is connected with the water outlet of the unit through the third solenoid valve, the water outlet of the heat exchanger is connected with the water outlet of the unit through the fourth solenoid valve, the water inlet of the energy storage water tank is connected with the return water port of the unit through the fifth solenoid valve, and the water inlet of the heat exchanger is connected with the return water port of the unit through the sixth solenoid valve.

[0005] In the present technical solution, the compressor assembly includes a compressor and a gas-liquid separator; the inlet of the gas-liquid separator is connected to the port b of the four-way valve, the outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the port d of the four-way valve.

[0006] In the technical solution, a dryer and an electronic expansion valve are also included; the inlet of the dryer is connected to the outlet of the heat exchange tube and the outlet of the energy storage tube respectively, and the outlet of the dryer is connected to the inlet of the evaporator through the electronic expansion valve.

[0007] In order to achieve the above-mentioned purpose, the second technical solution of the present invention is implemented as follows, which is a control method of an air source heat pump unit with a peak-valley electricity control strategy, characterized in that it includes the air source heat pump unit with a peak-valley electricity control strategy and the control method of an air source heat pump unit with a peak-valley electricity control strategy as described in claim 1, and the control method of the air source heat pump unit with a peak-valley electricity control strategy includes: When the electricity price is in the off-peak / off-peak period and the unit does not need heat load demand, the unit performs off-peak power energy recovery operation. The control method includes: ① The first solenoid valve is closed and the second solenoid valve is opened. The refrigerant passes through the compressor assembly, the four-way valve port d, the four-way valve port a, the second solenoid valve, the energy storage tube, the evaporator, the four-way valve port 1c, and the four-way valve port b and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A must be greater than 1, but the maximum value of the coefficient A must not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤The third solenoid valve and the fifth solenoid valve are opened, and the fourth solenoid valve and the sixth solenoid valve are closed; When the electricity price is in the off-peak / normal period and the client has a heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve is opened and the second solenoid valve is closed. The refrigerant passes through the compressor assembly, the four-way valve port d, the four-way valve port a, the first solenoid valve, the heat exchange tube, the evaporator, the four-way valve port c, and the four-way valve port b and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤The third solenoid valve and the fifth solenoid valve are closed, and the fourth solenoid valve and the sixth solenoid valve are opened; When the electricity price is at peak / peak time and the client has no heat load demand, the unit does not perform valley power energy recovery operation and is in standby mode; When the electricity price is at peak / peak time and the client has heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve is opened, and the second solenoid valve is opened. The refrigerant passes through the compressor assembly, the four-way valve port d and the four-way valve port a, and then enters the heat exchange tube through the first solenoid valve and enters the energy storage tube through the second solenoid valve. The refrigerant passing through the heat exchange tube and the energy storage tube then passes through the evaporator, the four-way valve port c, and the four-way valve port b in sequence and returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤The third solenoid valve and the fifth solenoid valve are opened, and the fourth solenoid valve and the sixth solenoid valve are opened; When the temperature of the energy storage tank 11 T1 ≥ the set temperature of the unit return water outlet T2, the unit is not running and is in standby mode, and the third solenoid valve and the fifth solenoid valve, the fourth solenoid valve and the sixth solenoid valve are closed until T1 < T2; When the temperature T1 of the energy storage water tank 11 is less than the set temperature T2 of the unit return water outlet, the unit is in heating operation, and the control method includes: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient D. The coefficient D should be smaller than 1, but the minimum value of the coefficient D should not be less than the operating range of the air source heat pump unit itself; ③ Compressor operating frequency P1: According to the default operation of the unit, P1*coefficient E; the E coefficient should be smaller than 1, but the minimum value of the E coefficient should not be less than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit, P2*coefficient F; the F coefficient should be smaller than 1, but the minimum value of the F coefficient should not be less than the operating range of the air source heat pump unit itself; ⑤The third solenoid valve and the fifth solenoid valve are closed, and the fourth solenoid valve and the sixth solenoid valve are opened.

[0008] In the present technical solution, the compressor assembly includes a compressor and a gas-liquid separator; the inlet of the gas-liquid separator is connected to the port b of the four-way valve, the outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the port d of the four-way valve.

[0009] In the technical solution, a dryer and an electronic expansion valve are also included; the inlet of the dryer is connected to the outlet of the heat exchange tube and the outlet of the energy storage tube respectively, and the outlet of the dryer is connected to the inlet of the evaporator through the electronic expansion valve.

[0010] This technical solution also includes: When the temperature T1 of the energy storage water tank 11 is ≥ 5 degrees Celsius, the unit will defrost and first absorb the heat stored in the water tank. The control method is as follows: ① The first solenoid valve is opened and the second solenoid valve is closed. The refrigerant passes through the compressor assembly, the four-way valve port d, the four-way valve port a, the first solenoid valve, the heat exchange tube, the evaporator, the four-way valve port c, and the four-way valve port b and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤The third solenoid valve and the fifth solenoid valve are closed, and the fourth solenoid valve and the sixth solenoid valve are opened; When the energy storage tank temperature T1 is less than 5 degrees Celsius, the unit will defrost. The control method is as follows: ① The first solenoid valve is opened and the second solenoid valve is closed. The refrigerant passes through the compressor assembly, the four-way valve port d, the four-way valve port a, the first solenoid valve, the heat exchange tube, the evaporator, the four-way valve port c, and the four-way valve port b and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient G, where G coefficient = 1; ③ Compressor component operating frequency P1: According to the default operation of the unit, P1 defaults to * coefficient H, H coefficient = 1; ④ Evaporator system fan operating frequency P2: according to the unit default operation: P2 default * coefficient I, I coefficient = 1; ⑤The third solenoid valve and the fifth solenoid valve are closed, and the fourth solenoid valve and the sixth solenoid valve are opened.

[0011] The advantages of the present invention compared with the prior art are as follows: the air source heat pump unit with a peak-valley electricity control strategy can make appropriate operating logic according to the peak-valley electricity prices of the national power grid, maximize the use of the heat storage properties of the air source heat pump, and maximize the use of valley electricity for heating, thereby meeting the customer's heating needs while achieving the goals of reducing operating costs, balancing the grid load, and reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the refrigerant and water flow path of the present invention. DETAILED DESCRIPTION

[0013] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0014] like Figure 1 As shown, it is an air source heat pump unit with peak-valley power control strategy, including: A four-way valve 1; the four-way valve 1 is provided with ports a, b, c and d, the port a is connected to the port d, and the port b is connected to the port c; a compressor assembly and an evaporator 4; the inlet of the compressor assembly is connected to the port b of the four-way valve 1, the outlet of the compressor assembly is connected to the port d of the four-way valve 1, and the outlet of the evaporator 4 is connected to the port c of the four-way valve 1; A heat exchanger 7 and an energy storage water tank 11; a heat exchange tube 71 is provided in the heat exchanger 7, and an energy storage tube 111 is provided in the energy storage water tank 11, and the outlet of the heat exchange tube 71 and the outlet of the energy storage tube 111 are respectively connected to the inlet of the evaporator 4; a first solenoid valve 13 and a second solenoid valve 14; the port a of the four-way valve 1 is connected to the inlet of the heat exchange tube 71 through the first solenoid valve 13, and the port a of the four-way valve 1 is connected to the inlet of the energy storage tube 111 through the second solenoid valve 14; and The third solenoid valve 12, the fourth solenoid valve 10, the fifth solenoid valve 9 and the sixth solenoid valve 8; the water outlet of the energy storage water tank 11 is communicated with the water outlet of the unit through the third solenoid valve 12, the water outlet of the heat exchanger 7 is communicated with the water outlet of the unit through the fourth solenoid valve 10, the water inlet of the energy storage water tank 11 is communicated with the return water port of the unit through the fifth solenoid valve 9, and the water inlet of the heat exchanger 7 is communicated with the return water port of the unit through the sixth solenoid valve 8. The unit's return water inlet refers to the water from the user's terminal equipment entering the heat pump unit; the unit's outlet refers to the water coming in from the return water inlet, passing through the unit's heat exchanger or water storage tank and out of the channel to the user's terminal equipment. The terminal equipment can refer to heating fins, floor heating coils, etc.; the other end of the return water inlet is a port of the user's terminal heat exchange equipment, and the outlet also refers to the other port where hot water comes out and is connected to the user's terminal heat exchange equipment; the heat exchange equipment is one-in-one-out, forming a closed loop to allow water or carriers to release heat. The unit's return water inlet and outlet are two interfaces of the unit itself. Only with one inlet and one outlet can the unit's heat be released to the user's terminal equipment.

[0015] When the electricity price is in the off-peak / off-peak period and the unit does not need heat load demand, the unit performs off-peak power energy recovery operation. The control method includes: ① The first solenoid valve 13 is closed and the second solenoid valve 14 is opened, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the second solenoid valve 14, the energy storage tube 111, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage water tank 11 is set to a temperature T1*coefficient A, where the coefficient A must be greater than 1, but the maximum value of the coefficient A must not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are opened, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are closed; When the electricity price is in the off-peak / normal period and the client has a heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened; When the electricity price is at peak / peak time and the client has no heat load demand, the unit does not perform valley power energy recovery operation and is in standby mode; When the electricity price is at peak / peak time and the client has heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve 13 is opened, and the second solenoid valve 14 is opened. The refrigerant passes through the compressor assembly, the four-way valve 1d port, and the four-way valve 1a port, and then enters the heat exchange tube 71 through the first solenoid valve 13 and enters the energy storage tube 111 through the second solenoid valve 14. The refrigerant passing through the heat exchange tube 71 and the energy storage tube 111 then passes through the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port in sequence and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are opened, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened; When the temperature T1 of the energy storage tank 11 is ≥ the set temperature T2 of the return water outlet of the unit, the unit is not running and is in standby mode, and the third solenoid valve 12 and the fifth solenoid valve 9, the fourth solenoid valve 10 and the sixth solenoid valve 8 are closed until T1 < T2; When the temperature T1 of the energy storage water tank 11 is less than the set temperature T2 of the unit return water outlet, the unit is in heating operation, and the control method includes: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient D. The coefficient D should be smaller than 1, but the minimum value of the coefficient D should not be less than the operating range of the air source heat pump unit itself; ③ Compressor operating frequency P1: According to the default operation of the unit, P1*coefficient E; the E coefficient should be smaller than 1, but the minimum value of the E coefficient should not be less than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: operate according to the default setting of the unit. P2*coefficient F; the coefficient F should be smaller than 1, but the minimum value of the coefficient F should not be less than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened.

[0016] In this embodiment, the compressor assembly includes a compressor 3 and a gas-liquid separator 2; the inlet of the gas-liquid separator 2 is connected to the b port of the four-way valve 1, the outlet of the gas-liquid separator 2 is connected to the inlet of the compressor 3, and the outlet of the compressor 3 is connected to the d port of the four-way valve 1.

[0017] In this embodiment, a dryer 6 and an electronic expansion valve 5 are also included; the inlet of the dryer 6 is connected to the outlet of the heat exchange tube 71 and the outlet of the energy storage tube 111 respectively, and the outlet of the dryer 6 is connected to the inlet of the evaporator 9 through the electronic expansion valve 5. Example

[0018] like Figure 1 As shown, it is a control method of an air source heat pump unit with a peak-valley electricity control strategy, including the air source heat pump unit with a peak-valley electricity control strategy and the control method of an air source heat pump unit with a peak-valley electricity control strategy as described in claim 1, and the control method of the air source heat pump unit with a peak-valley electricity control strategy includes: When the electricity price is in the off-peak / off-peak period and the unit does not need heat load demand, the unit performs off-peak power energy recovery operation. The control method includes: ① The first solenoid valve 13 is closed and the second solenoid valve 14 is opened, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the second solenoid valve 14, the energy storage tube 111, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage water tank 11 is set to a temperature T1*coefficient A, where the coefficient A must be greater than 1, but the maximum value of the coefficient A must not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are opened, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are closed; When the electricity price is in the off-peak / normal period and the client has a heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened; When the electricity price is at peak / peak time and the client has no heat load demand, the unit does not perform valley power energy recovery operation and is in standby mode; When the electricity price is at peak / peak time and the client has heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve 13 is opened, and the second solenoid valve 14 is opened. The refrigerant passes through the compressor assembly, the four-way valve 1d port, and the four-way valve 1a port, and then enters the heat exchange tube 71 through the first solenoid valve 13 and enters the energy storage tube 111 through the second solenoid valve 14. The refrigerant passing through the heat exchange tube 71 and the energy storage tube 111 then passes through the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port in sequence and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are opened, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened; When the temperature T1 of the energy storage tank 11 is ≥ the set temperature T2 of the return water outlet of the unit, the unit is not running and is in standby mode, and the third solenoid valve 12 and the fifth solenoid valve 9, the fourth solenoid valve 10 and the sixth solenoid valve 8 are closed until T1 < T2; When the temperature T1 of the energy storage water tank 11 is less than the set temperature T2 of the unit return water outlet, the unit is in heating operation, and the control method includes: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient D. The coefficient D should be smaller than 1, but the minimum value of the coefficient D should not be less than the operating range of the air source heat pump unit itself; ③ Compressor operating frequency P1: According to the default operation of the unit, P1*coefficient E; the E coefficient should be smaller than 1, but the minimum value of the E coefficient should not be less than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: operate according to the default setting of the unit. P2*coefficient F; the coefficient F should be smaller than 1, but the minimum value of the coefficient F should not be less than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened.

[0019] The unit structure includes: A four-way valve 1; the four-way valve 1 is provided with a port a, a port b, a port c and a port d, the port a is connected to the port d, and the port b is connected to the port c; Compressor assembly and evaporator 4; the inlet of the compressor assembly is connected to the port b of the four-way valve 1, the outlet of the compressor assembly is connected to the port d of the four-way valve 1, and the outlet of the evaporator 4 is connected to the port c of the four-way valve 1; A heat exchanger 7 and an energy storage water tank 11; a heat exchange tube 71 is provided in the heat exchanger 7, and an energy storage tube 111 is provided in the energy storage water tank 11, and the outlet of the heat exchange tube 71 and the outlet of the energy storage tube 111 are respectively connected to the inlet of the evaporator 4; a first solenoid valve 13 and a second solenoid valve 14; the port a of the four-way valve 1 is connected to the inlet of the heat exchange tube 71 through the first solenoid valve 13, and the port a of the four-way valve 1 is connected to the inlet of the energy storage tube 111 through the second solenoid valve 14; and The third solenoid valve 12, the fourth solenoid valve 10, the fifth solenoid valve 9 and the sixth solenoid valve 8; the water outlet of the energy storage water tank 11 is communicated with the water outlet of the unit through the third solenoid valve 12, the water outlet of the heat exchanger 7 is communicated with the water outlet of the unit through the fourth solenoid valve 10, the water inlet of the energy storage water tank 11 is communicated with the return water port of the unit through the fifth solenoid valve 9, and the water inlet of the heat exchanger 7 is communicated with the return water port of the unit through the sixth solenoid valve 8. The unit's return water inlet refers to the water from the user's terminal equipment entering the heat pump unit; the unit's outlet refers to the water coming in from the return water inlet, passing through the unit's heat exchanger or water storage tank and out of the channel to the user's terminal equipment. The terminal equipment can refer to heating fins, floor heating coils, etc.; the other end of the return water inlet is a port of the user's terminal heat exchange equipment, and the outlet also refers to the other port where hot water comes out and is connected to the user's terminal heat exchange equipment; the heat exchange equipment is one-in-one-out, forming a closed loop to allow water or carriers to release heat. The unit's return water inlet and outlet are two interfaces of the unit itself. Only with one inlet and one outlet can the unit's heat be released to the user's terminal equipment.

[0020] In this embodiment, the compressor assembly includes a compressor 3 and a gas-liquid separator 2; the inlet of the gas-liquid separator 2 is connected to the b port of the four-way valve 1, the outlet of the gas-liquid separator 2 is connected to the inlet of the compressor 3, and the outlet of the compressor 3 is connected to the d port of the four-way valve 1.

[0021] In this embodiment, a dryer 6 and an electronic expansion valve 5 are also included; the inlet of the dryer 6 is connected to the outlet of the heat exchange tube 71 and the outlet of the energy storage tube 111 respectively, and the outlet of the dryer 6 is connected to the inlet of the evaporator 9 through the electronic expansion valve 5.

[0022] In this embodiment, it also includes: When the temperature T1 of the energy storage water tank 11 is ≥ 5 degrees Celsius, the unit will defrost and first absorb the heat stored in the water tank. The control method is as follows: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened; When the temperature T1 of the energy storage water tank 11 is less than 5 degrees Celsius, the unit will defrost, and the control method is as follows: ① The first solenoid valve 13 is opened and the second solenoid valve 14 is closed, and the refrigerant passes through the compressor assembly, the four-way valve 1d port, the four-way valve 1a port, the first solenoid valve 13, the heat exchange tube 71, the evaporator 9, the four-way valve 1c port, and the four-way valve 1b port and then returns to the compressor assembly; ② The energy storage water tank 11 is set to a temperature of T1*coefficient G, where G coefficient = 1; ③ Compressor component operating frequency P1: According to the default operation of the unit, P1 defaults to * coefficient H, H coefficient = 1; ④ Evaporator 4 system fan operating frequency P2: according to the unit default operation: P2 default * coefficient I, I coefficient = 1; ⑤ The third solenoid valve 12 and the fifth solenoid valve 9 are closed, and the fourth solenoid valve 10 and the sixth solenoid valve 8 are opened.

[0023] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and deformations of these embodiments without departing from the principles and purposes of the present invention still fall within the scope of protection of the present invention.

Claims

1. An air source heat pump unit with peak-valley power control strategy, characterized in that include: A four-way valve (1); the four-way valve (1) is provided with a port a, a port b, a port c and a port d, the port a is connected to the port d, and the port b is connected to the port c; A compressor assembly and an evaporator (4); the inlet of the compressor assembly is connected to the port b of the four-way valve (1), the outlet of the compressor assembly is connected to the port d of the four-way valve (1), and the outlet of the evaporator (4) is connected to the port c of the four-way valve (1); A heat exchanger (7) and an energy storage water tank (11); a heat exchange tube (71) is provided in the heat exchanger (7), and an energy storage tube (111) is provided in the energy storage water tank (11); the outlet of the heat exchange tube (71) and the outlet of the energy storage tube (111) are respectively connected to the inlet of the evaporator (4); a first solenoid valve (13) and a second solenoid valve (14); the port a of the four-way valve (1) is connected to the inlet of the heat exchange tube (71) through the first solenoid valve (13), and the port a of the four-way valve (1) is connected to the inlet of the energy storage tube (111) through the second solenoid valve (14); and a third solenoid valve (12), a fourth solenoid valve (10), a fifth solenoid valve (9) and a sixth solenoid valve (8); the water outlet of the energy storage water tank (11) is communicated with the water outlet of the unit through the third solenoid valve (12), the water outlet of the heat exchanger (7) is communicated with the water outlet of the unit through the fourth solenoid valve (10), the water inlet of the energy storage water tank (11) is communicated with the water return port of the unit through the fifth solenoid valve (9), and the water inlet of the heat exchanger (7) is communicated with the water return port of the unit through the sixth solenoid valve (8).

2. The air source heat pump unit with peak-valley power control strategy according to claim 1 is characterized in that The compressor assembly comprises a compressor (3) and a gas-liquid separator (2); the inlet of the gas-liquid separator (2) is connected to the port b of the four-way valve (1), the outlet of the gas-liquid separator (2) is connected to the inlet of the compressor (3), and the outlet of the compressor (3) is connected to the port d of the four-way valve (1).

3. The air source heat pump unit with peak-valley power control strategy according to claim 1 is characterized in that It also includes a dryer (6) and an electronic expansion valve (5); the inlet of the dryer (6) is respectively connected to the outlet of the heat exchange tube (71) and the outlet of the energy storage tube (111), and the outlet of the dryer (6) is connected to the inlet of the evaporator (9) via the electronic expansion valve (5).

4. The control method of the air source heat pump unit with peak-valley power control strategy according to claim 1 is characterized in that The invention comprises an air source heat pump unit with a peak-valley electricity control strategy and a control method for an air source heat pump unit with a peak-valley electricity control strategy as described in claim 1, wherein the control method for an air source heat pump unit with a peak-valley electricity control strategy comprises: When the electricity price is in the off-peak / off-peak period and the unit does not need heat load demand, the unit performs off-peak power energy recovery operation. The control method includes: ① The first solenoid valve (13) is closed and the second solenoid valve (14) is opened, and the refrigerant passes through the compressor assembly, the d port of the four-way valve (1), the a port of the four-way valve (1), the second solenoid valve (14), the energy storage pipe (111), the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1) and then returns to the compressor assembly; ② The energy storage water tank (11) is set to a temperature T1*coefficient A, where coefficient A must be greater than 1, but the maximum value of coefficient A must not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are opened, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are closed; When the electricity price is in the off-peak / normal period and the client has a heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve (13) is opened and the second solenoid valve (14) is closed, and the refrigerant passes through the compressor assembly, the d port of the four-way valve (1), the a port of the four-way valve (1), the first solenoid valve (13), the heat exchange tube (71), the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1), and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are closed, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are opened; When the electricity price is at peak / peak time and the client has no heat load demand, the unit does not perform valley power energy recovery operation and is in standby mode; When the electricity price is at peak / peak time and the client has heat load demand, the unit performs heating operation. The control method includes: ① The first solenoid valve (13) is opened, and the second solenoid valve (14) is opened. The refrigerant passes through the compressor assembly, the d port of the four-way valve (1), and the a port of the four-way valve (1), and then respectively enters the heat exchange tube (71) through the first solenoid valve (13) and enters the energy storage tube (111) through the second solenoid valve (14). The refrigerant that has passed through the heat exchange tube (71) and the energy storage tube (111) then passes through the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1) in sequence, and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are opened, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are opened; When the temperature T1 of the energy storage water tank (11) is greater than or equal to the set temperature T2 of the water return port of the unit, the unit does not operate and is in a standby state, and the third solenoid valve (12) and the fifth solenoid valve (9), the fourth solenoid valve (10) and the sixth solenoid valve (8) are closed until T1 is less than T2; When the temperature T1 of the energy storage water tank (11) is less than the set temperature T2 of the unit return water outlet, the unit is in heating operation, and the control method includes: ① The first solenoid valve (13) is opened and the second solenoid valve (14) is closed, and the refrigerant passes through the compressor assembly, the d port of the four-way valve (1), the a port of the four-way valve (1), the first solenoid valve (13), the heat exchange tube (71), the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1), and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient D. The coefficient D should be smaller than 1, but the minimum value of the coefficient D should not be less than the operating range of the air source heat pump unit itself; ③ Compressor operating frequency P1: According to the default operation of the unit, P1*coefficient E; the E coefficient should be smaller than 1, but the minimum value of the E coefficient should not be less than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: operate according to the default setting of the unit. P2*coefficient F; the coefficient F should be smaller than 1, but the minimum value of the coefficient F should not be less than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are closed, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are opened.

5. The control method of the air source heat pump unit with peak-valley power control strategy according to claim 4 is characterized in that The compressor assembly comprises a compressor (3) and a gas-liquid separator (2); the inlet of the gas-liquid separator (2) is connected to the port b of the four-way valve (1), the outlet of the gas-liquid separator (2) is connected to the inlet of the compressor (3), and the outlet of the compressor (3) is connected to the port d of the four-way valve (1).

6. The control method of the air source heat pump unit with peak-valley power control strategy according to claim 4 is characterized in that It also includes a dryer (6) and an electronic expansion valve (5); the inlet of the dryer (6) is respectively connected to the outlet of the heat exchange tube (71) and the outlet of the energy storage tube (111), and the outlet of the dryer (6) is connected to the inlet of the evaporator (9) via the electronic expansion valve (5).

7. The control method of the air source heat pump unit with peak-valley power control strategy according to claim 4 is characterized in that Also includes: When the temperature T1 of the energy storage water tank (11) is ≥ 5 degrees Celsius, the unit starts to defrost, first absorbing the heat stored in the water tank. The control method is as follows: ① The first solenoid valve (13) is opened and the second solenoid valve (14) is closed, and the refrigerant passes through the compressor assembly, the d port of the four-way valve (1), the a port of the four-way valve (1), the first solenoid valve (13), the heat exchange tube (71), the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1), and then returns to the compressor assembly; ② The energy storage tank is set to a temperature of T1*coefficient A. The coefficient A should be greater than 1, but the maximum value of the coefficient A should not be higher than the operating range of the air source heat pump unit itself; ③ The operating frequency of the compressor component P1 is based on the default operation of the unit, P1*coefficient B; the B coefficient should be greater than 1, but the maximum value of the B coefficient should not be higher than the operating range of the air source heat pump unit itself; ④ Evaporator system fan operating frequency P2: according to the default operation of the unit: P2*coefficient C; the C coefficient should be greater than 1, but the maximum value of the C coefficient should not be higher than the operating range of the air source heat pump unit itself; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are closed, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are opened; When the temperature T1 of the energy storage water tank (11) is less than 5 degrees Celsius, the unit is defrosted. The control method is as follows: ① The first solenoid valve (13) is opened and the second solenoid valve (14) is closed, and the refrigerant passes through the compressor assembly, the d port of the four-way valve (1), the a port of the four-way valve (1), the first solenoid valve (13), the heat exchange tube (71), the evaporator (9), the c port of the four-way valve (1), and the b port of the four-way valve (1), and then returns to the compressor assembly; ② The energy storage water tank (11) is set to a temperature of T1*coefficient G, where G coefficient = 1; ③ Compressor component operating frequency P1: According to the default operation of the unit, P1 defaults to * coefficient H, H coefficient = 1; ④ Evaporator 4 system fan operating frequency P2: according to the unit default operation: P2 default * coefficient I, I coefficient = 1; ⑤ The third solenoid valve (12) and the fifth solenoid valve (9) are closed, and the fourth solenoid valve (10) and the sixth solenoid valve (8) are opened.

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