Double-source heat pump unit with photovoltaic power and commercial power and linkage control method

Abstract

The invention relates to a linkage control method for a double-source heat pump unit with photovoltaic power and commercial power. Comprising a compressor, a photovoltaic power source, a mains supply, an air heat exchanger, a first four-way reversing valve, a second four-way reversing valve, a second one-way valve, a user terminal load, a first one-way valve, a first stop valve, a second stop valve, a gas-liquid separator, a liquid storage tank, a first electronic expansion valve, a first stop valve, a second electronic expansion valve, a second stop valve and a third electronic expansion valve. And a third stop valve, a swimming pool and a hot water heat exchanger. The device has the advantages that the waste heat recovery function is achieved, and heat of the condenser can be recovered for hot water or a swimming pool; and the condensing temperature is lower, the throttling temperature is reduced, and cold water with lower temperature is generated.

Description

Technical Field

[0001] The present invention relates to a dual-source heat pump unit with photovoltaic and mains power and an interlocking control method. Background Art

[0002] At present, air-source heat pump units, heating units or pool heat pumps can basically not effectively combine the peak-valley electricity of the national power grid and household photovoltaic electricity to make an interlocking control of the heat pump, and cannot achieve the purpose of energy saving and cost saving; how to make the air-source heat pump make appropriate control strategies according to the peak-valley electricity price of the national power grid, and how to make greater use of photovoltaic power generation to drive the heat pump, so as to reduce the operating cost of the air-source heat pump, has become a difficult problem for the industry to discuss; the existing air-source heat pump systems have not effectively combined customer needs, achieved multi-purpose use of one machine, and are lacking in heat storage and cold storage, and cannot effectively combine the energy needs of the whole family with heat and cold to make an optimal operation plan, and cannot achieve the best cost-saving and energy-saving purposes. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a dual-source heat pump unit with photovoltaic and mains power and an interlocking control method, which has the attribute of multi-purpose use of one machine, and can meet heating in the family, air-conditioning refrigeration in the family, hot water, pool heating, etc.; it has a peak-valley electricity control strategy, and can make appropriate operation logics according to rainy days and the peak-valley electricity price of the national power grid, maximize the use of photovoltaic power generation to drive the air-source heat pump, and make the best use of valley electricity for heating, heat storage and cold storage, so as to achieve the purpose of reducing operation costs, balancing the power grid load and reducing carbon emissions while meeting the heat demand of customers. Combining various usage scenarios, the heat pump unit can store heat in winter and store cold in summer according to the usage requirements and water temperature of the family pool customers, and make the best use of photovoltaic power generation and valley electricity to reserve energy for heating and cooling requirements on cloudy days and peak electricity days.

[0004] In order to achieve the above purpose, the technical solution of the present invention is realized as follows. It is a dual-source heat pump unit with photovoltaic and mains power and an interlocking control method, which is characterized by further comprising: A compressor, a photovoltaic power supply and a mains power supply; the power input end of the compressor is electrically connected to the photovoltaic power supply and the mains power supply respectively; An air heat exchanger, a first four-way reversing valve, a second four-way reversing valve, and a second one-way valve; the first four-way reversing valve and the second four-way reversing valve are respectively provided with ports a, b, c, and d. The port a of the second four-way reversing valve is communicated with the refrigerant outlet of the compressor, the port b of the second four-way reversing valve is communicated with one refrigerant port of the air heat exchanger, the port c of the second four-way reversing valve is communicated with the inlet of the second one-way valve, and the port d of the second four-way reversing valve is communicated with the port a of the first four-way reversing valve; User end load, first check valve, first stop valve and second stop valve; the b port of the first four-way reversing valve is respectively communicated with a refrigerant port of the first stop valve and a refrigerant port of the second stop valve, the c port of the first four-way reversing valve is communicated with the inlet of the first check valve, and the d port of the first four-way reversing valve is communicated with a refrigerant port of the load; Gas-liquid separator; the gas-liquid separator has two refrigerant inlets and one refrigerant outlet, one refrigerant inlet of the gas-liquid separator is communicated with the outlet of the first check valve, the other refrigerant inlet of the gas-liquid separator is communicated with the outlet of the second check valve, and the refrigerant outlet of the gas-liquid separator is communicated with the refrigerant inlet of the compressor; Liquid storage tank, first electronic expansion valve, first stop valve, second electronic expansion valve, second stop valve, third electronic expansion valve and third stop valve; the liquid storage tank has ports a, b and c, the a port of the liquid storage tank is respectively communicated with a refrigerant port of the first electronic expansion valve and a refrigerant port of the first stop valve, the b port of the liquid storage tank is respectively communicated with a refrigerant port of the second electronic expansion valve and a refrigerant port of the second stop valve, the c port of the liquid storage tank is respectively communicated with the third electronic expansion valve and a refrigerant port of the third stop valve, the other refrigerant port of the first electronic expansion valve and the other refrigerant port of the first stop valve are respectively communicated with the other refrigerant port of the air heat exchanger, and the other refrigerant port of the third electronic expansion valve and the other refrigerant port of the third stop valve are respectively communicated with the other refrigerant port of the load; and Swimming pool and hot water heat exchanger; one refrigerant port of the swimming pool is communicated with the other refrigerant port of the second stop valve, one refrigerant port of the hot water heat exchanger is communicated with the other refrigerant port of the first stop valve, and the other refrigerant ports of the swimming pool and the other refrigerant port of the hot water heat exchanger are respectively communicated with the other refrigerant port of the second electronic expansion valve and the other refrigerant port of the second stop valve.

[0005] A linkage control method for a dual-source heat pump unit with photovoltaic and mains electricity according to the claim, characterized in that it includes the following control modes: ① Hot water mode The compressor works, and the refrigerant of the compressor sequentially passes through the a port of the second four-way reversing valve, the d port of the second four-way reversing valve, the a port of the first four-way reversing valve, the b port of the first four-way reversing valve, the first stop valve, the hot water heat exchanger, the second stop valve, the b port of the liquid storage tank, the a port of the liquid storage tank, the first electronic expansion valve, the air heat exchanger, the b port of the second four-way reversing valve, the c port of the second four-way reversing valve, the second check valve, the other refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ② Cold water air-conditioning mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port b of the second four-way reversing valve, the air heat exchanger, the first stop valve, port a of the liquid storage tank, port c of the liquid storage tank, the third electronic expansion valve, the load, port d of the first four-way reversing valve, port c of the first four-way reversing valve, the first check valve, one refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ③ Hot water and air conditioning mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port d of the second four-way reversing valve, port a of the first four-way reversing valve, port b of the first four-way reversing valve, the first stop valve, the hot water heat exchanger, the second stop valve, port b of the liquid storage tank, port c of the liquid storage tank, the third electronic expansion valve, the load, port d of the first four-way reversing valve, port c of the first four-way reversing valve, the first check valve, one refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ④ Pool heating and heat storage mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port d of the second four-way reversing valve, port a of the first four-way reversing valve, port b of the first four-way reversing valve, the second stop valve, the refrigerant flow path of the pool, the second stop valve, port b of the liquid storage tank, port a of the liquid storage tank, the first electronic expansion valve, the air heat exchanger, port b of the second four-way reversing valve, port c of the second four-way reversing valve, the second check valve, the other refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ⑤ Pool cooling and cold storage mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port b of the second four-way reversing valve, the air heat exchanger, the first stop valve, port a of the liquid storage tank, port b of the liquid storage tank, the second electronic expansion valve, the refrigerant flow path of the pool, the second stop valve, port b of the first four-way reversing valve, port c of the first four-way reversing valve, the first check valve, one refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ⑥ Pool heat storage and heating mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port d of the second four-way reversing valve, port a of the first four-way reversing valve, port d of the first four-way reversing valve, the load, the third stop valve, port c of the liquid storage tank, port b of the liquid storage tank, the second electronic expansion valve, the pool refrigerant flow path, the second stop valve, port b of the first four-way reversing valve, port c of the first four-way reversing valve, the first check valve, one refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator and then returns to the compressor; ⑦ Pool cold storage and air conditioning mode The compressor operates, and the refrigerant of the compressor sequentially passes through port a of the second four-way reversing valve, port d of the second four-way reversing valve, port a of the first four-way reversing valve, port b of the first four-way reversing valve, the second stop valve, the refrigerant flow path of the swimming pool, the second stop valve, port b of the liquid storage tank, port c of the liquid storage tank, the third electronic expansion valve, the load, port d of the first four-way reversing valve, port c of the first four-way reversing valve, the first check valve, one refrigerant port of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator, and then returns to the compressor; Among the above seven modes, the photovoltaic power supply and the mains power supply provide the working power supply for the compressor according to the actual situation, and the power supply method is as follows: When the season is winter and the electricity price is at the valley period, and there is no heat load demand from the client load, the unit operates for valley electricity energy storage, stores heat in the swimming pool, and operates according to the swimming pool heating and heat storage mode until the valley electricity time ends; When the season is summer and the electricity price is at the valley period, and there is no cooling load and hot water demand from the client load, the unit operates for valley electricity energy storage, stores cold in the swimming pool, and operates according to the swimming pool refrigeration and cold storage mode. The condition for starting this mode is that the swimming pool water temperature value T > the set value of the client's swimming pool to start cold storage, and the swimming pool water temperature after storing cold is not lower than 0°C to -3°C of the client's swimming pool set water temperature to avoid affecting the client's use experience; When the season is winter and the electricity price is at the valley period, and there is heat load demand from the client load, the unit directly operates according to the above hot water mode or the swimming pool heat storage heating mode; When the season is summer and the electricity price is at the valley period, and there is cooling load or hot water demand from the client load, the unit operates according to the chilled water air conditioning mode or the hot water and air conditioning mode or the hot water mode; When the season is winter and the electricity price is at the peak or spike period, and there is no heat load demand from the client load, the unit does not perform valley electricity energy storage and is in the standby state; When in winter, the electricity price is at the peak or spike period, and there is heat load demand from the client load, judge the current swimming pool water temperature T1 and the ambient temperature T2. If T1 > T2, the unit enters the swimming pool heat storage heating mode; if T1 ≤ T2, the unit enters the swimming pool heat storage heating mode; the hot water mode is not affected by this and is turned on according to the client's demand; When in summer, the electricity price is at the peak or spike period, and there is cooling load demand from the client load, judge the current swimming pool water temperature T1 and the ambient temperature T2. If T1 < T2, the unit enters the swimming pool cold storage air conditioning mode; if T1 ≥ T2, the unit enters the chilled water air conditioning mode; the hot water mode is not affected by this and is turned on according to the client's demand.

[0006] The advantages of the present invention compared with the prior art are: it has the function of waste heat recovery, can recover the heat of the condenser for hot water or the swimming pool; the condensation temperature is lower, reducing the throttling temperature and generating colder chilled water. Brief Description of the Drawings

[0007] Figure 1 It is a schematic diagram of the refrigerant flow path of the present invention. Detailed Embodiments

[0008] The following further describes the detailed embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on 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. Embodiment

[0009] As Figure 1 shown, it is a dual-source heat pump unit with photovoltaic and mains power and an interlocking control method, including: A compressor 19, a photovoltaic power supply 20, and a mains power supply 21; the power input end of the compressor 19 is electrically connected to the photovoltaic power supply 20 and the mains power supply 21 respectively; An air heat exchanger 1, a first four-way reversing valve 14, a second four-way reversing valve 18, and a second check valve 13; the first four-way reversing valve 14 and the second four-way reversing valve 18 are each provided with ports a, b, c, and d. The port a of the second four-way reversing valve 18 is communicated with the refrigerant outlet of the compressor 19, the port b of the second four-way reversing valve 18 is communicated with a refrigerant port of the air heat exchanger 1, the port c of the second four-way reversing valve 18 is communicated with the inlet of the second check valve 13, and the port d of the second four-way reversing valve 18 is communicated with the port a of the first four-way reversing valve 14; A user end load 10, a first check valve 11, a first stop valve 16, and a second stop valve 17; the port b of the first four-way reversing valve 14 is respectively communicated with a refrigerant port of the first stop valve 16 and a refrigerant port of the second stop valve 17. The port c of the first four-way reversing valve 14 is communicated with the inlet of the first check valve 11, and the port d of the first four-way reversing valve 14 is communicated with a refrigerant port of the load 10; A gas-liquid separator 12; the gas-liquid separator 12 has two refrigerant inlets and one refrigerant outlet. One refrigerant inlet of the gas-liquid separator 12 is communicated with the outlet of the first check valve 11, the other refrigerant inlet of the gas-liquid separator 12 is communicated with the outlet of the second check valve 13, and the refrigerant outlet of the gas-liquid separator 12 is communicated with the refrigerant inlet of the compressor 19; A liquid storage tank 9, a first electronic expansion valve 2, a first stop valve 3, a second electronic expansion valve 5, a second stop valve 6, a third electronic expansion valve 7 and a third stop valve 8; the liquid storage tank 9 has a port a, a port b and a port c. The port a of the liquid storage tank 9 is respectively communicated with a refrigerant port of the first electronic expansion valve 2 and a refrigerant port of the first stop valve 3. The port b of the liquid storage tank 9 is respectively communicated with a refrigerant port of the second electronic expansion valve 5 and a refrigerant port of the second stop valve 6. The port c of the liquid storage tank 9 is respectively communicated with the third electronic expansion valve 7 and a refrigerant port of the third stop valve 8. The other refrigerant port of the first electronic expansion valve 2 and the other refrigerant port of the first stop valve 3 are respectively communicated with the other refrigerant port of the air heat exchanger 1. The other refrigerant port of the third electronic expansion valve 7 and the other refrigerant port of the third stop valve 8 are respectively communicated with the other refrigerant port of the load 10; and A swimming pool 4 and a hot water heat exchanger 15; a refrigerant port of the swimming pool 4 is communicated with the other refrigerant port of the second stop valve 17. A refrigerant port of the hot water heat exchanger 15 is communicated with the other refrigerant port of the first stop valve 16. The other refrigerant port of the swimming pool 4 and the other refrigerant port of the hot water heat exchanger 15 are respectively communicated with the other refrigerant port of the second electronic expansion valve 5 and the other refrigerant port of the second stop valve 6.

[0010] The load 10 provides heat for users to keep warm or provides cooling for users' air conditioners. The hot water heat exchanger 15 provides heat for hot water for end users to use. The swimming pool 4 is a constant temperature swimming pool, which heats or cools according to the ambient temperature. During operation, the structure includes the following control modes: ① Hot water mode The compressor 19 operates. The refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port b of the first four-way reversing valve 14, the first stop valve 16, the hot water heat exchanger 15, the second stop valve 6, the port b of the liquid storage tank 9, the port a of the liquid storage tank 9, the first electronic expansion valve 2, the air heat exchanger 1, the port b of the second four-way reversing valve 18, the port c of the second four-way reversing valve 18, the second check valve 13, the other refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ② Cold water air conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through port a of the second four-way reversing valve 18, port b of the second four-way reversing valve 18, the air heat exchanger 1, the first stop valve 3, port a of the liquid storage tank 9, port c of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, port d of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, the first check valve 11, one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ③ Hot water and air conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port b of the first four-way reversing valve 14, the first stop valve 16, the hot water heat exchanger 15, the second stop valve 6, port b of the liquid storage tank 9, port c of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, port d of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, the first check valve 11, one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ④ Pool heating and heat storage mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port b of the first four-way reversing valve 14, the second stop valve 17, the refrigerant flow path of the pool 4, the second stop valve 6, port b of the liquid storage tank 9, port a of the liquid storage tank 9, the first electronic expansion valve 2, the air heat exchanger 1, port b of the second four-way reversing valve 18, port c of the second four-way reversing valve 18, the second check valve 13, the other refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑤ Pool cooling and cold storage mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through port a of the second four-way reversing valve 18, port b of the second four-way reversing valve 18, the air heat exchanger 1, the first stop valve 3, port a of the liquid storage tank 9, port b of the liquid storage tank 9, the second electronic expansion valve 5, the refrigerant flow path of the pool 4, the second stop valve 17, port b of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, the first check valve 11, one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑥ Pool heat storage and heating mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port d of the first four-way reversing valve 14, the load 10, the third stop valve 8, the port c of the liquid storage tank 9, the port b of the liquid storage tank 9, the second electronic expansion valve 5, the refrigerant flow path of the swimming pool 4, the second stop valve 17, the port b of the first four-way reversing valve 14, the port c of the first four-way reversing valve 14, the first check valve 11, one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑦ Swimming pool cold storage air-conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port b of the first four-way reversing valve 14, the second stop valve 17, the refrigerant flow path of the swimming pool 4, the second stop valve 6, the port b of the liquid storage tank 9, the port c of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, the port d of the first four-way reversing valve 14, the port c of the first four-way reversing valve 14, the first check valve 11, one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; In the above seven modes, the photovoltaic power supply 20 and the mains power supply 21 provide the working power for the compressor 19 according to the actual situation, and the power supply method is as follows: When the season is winter and the electricity price is at the valley period, and the client load 10 has no heat load demand, the unit operates in the valley electricity energy storage mode, storing heat in the swimming pool 4, and the mode operates according to the swimming pool heating and heat storage mode until the valley electricity time ends; When the season is summer and the electricity price is at the valley period, and the client load 10 has no cooling load and hot water demand, the unit operates in the valley electricity energy storage mode, storing cold in the swimming pool 4, and the mode operates according to the swimming pool refrigeration and cold storage mode, and the condition for starting this mode is: when the water temperature value T1 of the swimming pool 4 > the set value of the client's swimming pool 4, the cold storage starts, and after storing the cold, the water temperature of the swimming pool 4 is not lower than 0°C to -3°C of the set water temperature of the client's swimming pool 4 to avoid affecting the client's use experience; When the season is winter and the electricity price is at the valley period, and the client load 10 has a heat load demand, the unit directly operates according to the above hot water mode or the swimming pool heat storage heating mode; When the season is summer and the electricity price is at the valley period, and the client load 10 has a cooling load or hot water demand, the unit operates according to the chilled water air-conditioning mode or the hot water and air-conditioning mode or the hot water mode; When the season is winter and the electricity price is at the peak or spike period, and the client load 10 has no heat load demand, the unit does not perform valley electricity energy storage and is in the standby state; When in winter, when the electricity price is at the peak or super-peak period and the client load 10 has a heating load demand, judge the current water temperature T1 of the swimming pool 4 and the ambient temperature T2. If T1 > T2, the unit enters the swimming pool heat storage heating mode; if T1 ≤ T2, the unit also enters the swimming pool heat storage heating mode; the hot water mode is not affected by this and is turned on according to the customer's demand. When in summer, when the electricity price is at the peak or super-peak period and the client load 10 has a cooling load demand, judge the current water temperature T1 of the swimming pool 4 and the ambient temperature T2. If T1 < T2, the unit enters the swimming pool cold storage air conditioning mode; if T1 ≥ T2, the unit enters the chilled water air conditioning mode; the hot water mode is not affected by this and is turned on according to the customer's demand. Embodiment

[0011] As Figure 1 shown, it is a linkage control method for a dual-source heat pump unit with photovoltaic and mains power, characterized by including the following control modes: ① Hot water mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the a port of the second four-way reversing valve 18, the d port of the second four-way reversing valve 18, the a port of the first four-way reversing valve 14, the b port of the first four-way reversing valve 14, the first stop valve 16, the hot water heat exchanger 15, the second stop valve 6, the b port of the liquid storage tank 9, the a port of the liquid storage tank 9, the first electronic expansion valve 2, the air heat exchanger 1, the b port of the second four-way reversing valve 18, the c port of the second four-way reversing valve 18, the second check valve 13, the other refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ② Chilled water air conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the a port of the second four-way reversing valve 18, the b port of the second four-way reversing valve 18, the air heat exchanger 1, the first stop valve 3, the a port of the liquid storage tank 9, the c port of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, the d port of the first four-way reversing valve 14, the c port of the first four-way reversing valve 14, the first check valve 11, the one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ③ Hot water and air conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the a port of the second four-way reversing valve 18, the d port of the second four-way reversing valve 18, the a port of the first four-way reversing valve 14, the b port of the first four-way reversing valve 14, the first stop valve 16, the hot water heat exchanger 15, the second stop valve 6, the b port of the liquid storage tank 9, the c port of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, the d port of the first four-way reversing valve 14, the c port of the first four-way reversing valve 14, the first check valve 11, the one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ④Pool heating and heat storage mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port b of the first four-way reversing valve 14, the second stop valve 17, the refrigerant flow path of the pool 4, the second stop valve 6, the port b of the liquid storage tank 9, the port a of the liquid storage tank 9, the first electronic expansion valve 2, the air heat exchanger 1, the port b of the second four-way reversing valve 18, the port c of the second four-way reversing valve 18, the second one-way valve 13, the other refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑤Pool cooling and cold storage mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port b of the second four-way reversing valve 18, the air heat exchanger 1, the first stop valve 3, the port a of the liquid storage tank 9, the port b of the liquid storage tank 9, the second electronic expansion valve 5, the refrigerant flow path of the pool 4, the second stop valve 17, the port b of the first four-way reversing valve 14, the port c of the first four-way reversing valve 14, the first one-way valve 11, the one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑥Pool heat storage and heating mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port d of the first four-way reversing valve 14, the load 10, the third stop valve 8, the port c of the liquid storage tank 9, the port b of the liquid storage tank 9, the second electronic expansion valve 5, the refrigerant flow path of the pool 4, the second stop valve 17, the port b of the first four-way reversing valve 14, the port c of the first four-way reversing valve 14, the first one-way valve 11, the one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; ⑦Pool cold storage and air conditioning mode The compressor 19 operates, and the refrigerant of the compressor 19 sequentially passes through the port a of the second four-way reversing valve 18, the port d of the second four-way reversing valve 18, the port a of the first four-way reversing valve 14, the port b of the first four-way reversing valve 14, the second stop valve 17, the refrigerant flow path of the pool 4, the second stop valve 6, the port b of the liquid storage tank 9, the port c of the liquid storage tank 9, the third electronic expansion valve 7, the load 10, the port d of the first four-way reversing valve 14, the port c of the first four-way reversing valve 14, the first one-way valve 11, the one refrigerant port of the gas-liquid separator 12, and the refrigerant outlet of the gas-liquid separator 12 and then returns to the compressor 19; In the above seven modes, the photovoltaic power supply 20 and the mains power supply 21 provide the working power supply for the compressor 19 according to the actual situation, and the power supply method is as follows: When the season is winter and the electricity price is at the valley period, and there is no heat load demand from the client load 10, the unit operates in the valley electricity energy storage mode, storing heat in the swimming pool 4, and the mode operates according to the swimming pool heating and heat storage mode until the valley electricity time ends; When the season is summer and the electricity price is at the valley period, and there is no cooling load and hot water demand from the client load 10, the unit operates in the valley electricity energy storage mode, storing cold in the swimming pool 4, and the mode operates according to the swimming pool refrigeration and cold storage mode, and the condition for starting this mode is: when the water temperature value T1 of the swimming pool 4 > the set value of the client's swimming pool 4, cold storage starts, and after storing cold, the water temperature of the swimming pool 4 is not lower than 0°C to -3°C of the set water temperature of the client's swimming pool 4 to avoid affecting the client's usage experience; When the season is winter and the electricity price is at the valley period, and there is heat load demand from the client load 10, the unit directly operates according to the above hot water mode or the swimming pool heat storage heating mode; When the season is summer and the electricity price is at the valley period, and there is cooling load or hot water demand from the client load 10, the unit operates in the chilled water air conditioning mode or the hot water and air conditioning mode or the hot water mode; When the season is winter and the electricity price is at the peak or super-peak period, and there is no heat load demand from the client load 10, the unit does not perform valley electricity energy storage and is in the standby state; When in winter, the electricity price is at the peak or super-peak period, and there is heat load demand from the client load 10, judge the current water temperature T1 of the swimming pool 4 and the ambient temperature T2. If T1 > T2, the unit enters the swimming pool heat storage heating mode; if T1 ≤ T2, the unit enters the swimming pool heat storage heating mode; the hot water mode is not affected by this and is turned on according to the client's demand; When in summer, the electricity price is at the peak or super-peak period, and there is cooling load demand from the client load 10, judge the current water temperature T1 of the swimming pool 4 and the ambient temperature T2. If T1 < T2, the unit enters the swimming pool cold storage air conditioning mode; if T1 ≥ T2, the unit enters the chilled water air conditioning mode; the hot water mode is not affected by this and is turned on according to the client's demand.

[0012] When in use, the structure of the above mode is as follows: Compressor 19, photovoltaic power supply 20 and mains power supply 21; the power input end of the compressor 19 is electrically connected to the photovoltaic power supply 20 and the mains power supply 21 respectively; Air heat exchanger 1, first four-way reversing valve 14, second four-way reversing valve 18, second check valve 13; on both the first four-way reversing valve 14 and the second four-way reversing valve 18, there are respectively an a port, a b port, a c port and a d port. The a port of the second four-way reversing valve 18 is communicated with the refrigerant outlet of the compressor 19, the b port of the second four-way reversing valve 18 is communicated with a refrigerant port of the air heat exchanger 1, the c port of the second four-way reversing valve 18 is communicated with the inlet of the second check valve 13, and the d port of the second four-way reversing valve 18 is communicated with the a port of the first four-way reversing valve 14; User end load 10, first one-way valve 11, first stop valve 16 and second stop valve 17; the b port of the first four-way reversing valve 14 is respectively communicated with a refrigerant port of the first stop valve 16 and a refrigerant port of the second stop valve 17, the c port of the first four-way reversing valve 14 is communicated with the inlet of the first one-way valve 11, and the d port of the first four-way reversing valve 14 is communicated with a refrigerant port of the load 10; Gas-liquid separator 12; the gas-liquid separator 12 has two refrigerant inlets and one refrigerant outlet, one refrigerant inlet of the gas-liquid separator 12 is communicated with the outlet of the first one-way valve 11, the other refrigerant inlet of the gas-liquid separator 12 is communicated with the outlet of the second one-way valve 13, and the refrigerant outlet of the gas-liquid separator 12 is communicated with the refrigerant inlet of the compressor 19; Liquid storage tank 9, first electronic expansion valve 2, first stop valve 3, second electronic expansion valve 5, second stop valve 6, third electronic expansion valve 7 and third stop valve 8; the liquid storage tank 9 has ports a, b and c, the a port of the liquid storage tank 9 is respectively communicated with a refrigerant port of the first electronic expansion valve 2 and a refrigerant port of the first stop valve 3, the b port of the liquid storage tank 9 is respectively communicated with a refrigerant port of the second electronic expansion valve 5 and a refrigerant port of the second stop valve 6, the c port of the liquid storage tank 9 is respectively communicated with the third electronic expansion valve 7 and a refrigerant port of the third stop valve 8, the other refrigerant port of the first electronic expansion valve 2 and the other refrigerant port of the first stop valve 3 are respectively communicated with the other refrigerant port of the air heat exchanger 1, and the other refrigerant port of the third electronic expansion valve 7 and the other refrigerant port of the third stop valve 8 are respectively communicated with the other refrigerant port of the load 10; and Swimming pool 4 and hot water heat exchanger 15; one refrigerant port of the swimming pool 4 is communicated with the other refrigerant port of the second stop valve 17, one refrigerant port of the hot water heat exchanger 15 is communicated with the other refrigerant port of the first stop valve 16, and the other refrigerant port of the swimming pool 4 and the other refrigerant port of the hot water heat exchanger 15 are respectively communicated with the other refrigerant port of the second electronic expansion valve 5 and the other refrigerant port of the second stop valve 6.

[0013] The load 10 is a structure that provides heat or cooling to users.

[0014] The above has made a detailed description of the embodiments of the present invention in conjunction with the drawings, but the present invention is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions and deformations of these embodiments still fall within the protection scope of the present invention without departing from the principle and purpose of the present invention.

Claims

1. A dual-source heat pump unit with photovoltaic and city electricity, characterized in that Also includes: A compressor (19), a photovoltaic power source (20) and a mains power source (21); a power input end of the compressor (19) is electrically connected to the photovoltaic power source (20) and the mains power source (21), respectively; An air heat exchanger (1), a first four-way reversing valve (14), a second four-way reversing valve (18), and a second non-return valve (13); a port a, a port b, a port c, and a port d are respectively provided on the first four-way reversing valve (14) and the second four-way reversing valve (18); the port a of the second four-way reversing valve (18) is connected to a refrigerant outlet of a compressor (19); the port b of the second four-way reversing valve (18) is connected to a refrigerant port of the air heat exchanger (1); the port c of the second four-way reversing valve (18) is connected to an inlet of the second non-return valve (13); and the port d of the second four-way reversing valve (18) is connected to the port a of the first four-way reversing valve (14); A user end load (10), a first one-way valve (11), a first stop valve (16) and a second stop valve (17); port b of the first four-way reversing valve (14) is respectively connected to a refrigerant port of the first stop valve (16) and a refrigerant port of the second stop valve (17); port c of the first four-way reversing valve (14) is connected to an inlet of the first one-way valve (11); and port d of the first four-way reversing valve (14) is connected to a refrigerant port of the load (10); A gas-liquid separator (12); the gas-liquid separator (12) has two refrigerant inlets and a refrigerant outlet, one refrigerant inlet of the gas-liquid separator (12) is connected to the outlet of the first one-way valve (11), the other refrigerant inlet of the gas-liquid separator (12) is connected to the outlet of the second one-way valve (13), and the refrigerant outlet of the gas-liquid separator (12) is connected to the refrigerant inlet of the compressor (19); A liquid storage tank (9), a first electronic expansion valve (2), a first stop valve (3), a second electronic expansion valve (5), a second stop valve (6), a third electronic expansion valve (7) and a third stop valve (8); the liquid storage tank (9) has a port a, a port b and a port c, the port a of the liquid storage tank (9) is respectively connected to a refrigerant port of the first electronic expansion valve (2) and a refrigerant port of the first stop valve (3), the port b of the liquid storage tank (9) is respectively connected to a refrigerant port of the second electronic expansion valve (5) and a refrigerant port of the second stop valve (6), the port c of the liquid storage tank (9) is respectively connected to a refrigerant port of the third electronic expansion valve (7) and a refrigerant port of the third stop valve (8), the other refrigerant port of the first electronic expansion valve (2) and the other refrigerant port of the first stop valve (3) are respectively connected to the other refrigerant port of the air heat exchanger (1), the other refrigerant port of the third electronic expansion valve (7) and the other refrigerant port of the third stop valve (8) are respectively connected to the other refrigerant port of the load (10); and A swimming pool (4) and a hot water heat exchanger (15); a refrigerant port of the swimming pool (4) is connected to another refrigerant port of the second stop valve (17), a refrigerant port of the hot water heat exchanger (15) is connected to another refrigerant port of the first stop valve (16), and another refrigerant port of the swimming pool (4) and another refrigerant port of the hot water heat exchanger (15) are respectively connected to another refrigerant port of the second electronic expansion valve (5) and another refrigerant port of the second stop valve (6).

2. The linkage control method of a dual-source heat pump unit with photovoltaic and mains power according to claim 1, characterized in that The control modes include: ①Hot water mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a first stop valve (16), a hot water heat exchanger (15), a second stop valve (6), a port of the liquid storage tank (9), a port of the liquid storage tank (9), a first electronic expansion valve (2), an air heat exchanger (1), a port of the second four-way reversing valve (18), a port of the second four-way reversing valve (18), a second check valve (13), another refrigerant port of the gas-liquid separator (12), and a refrigerant outlet of the gas-liquid separator (12) before returning to the compressor (19); ②Cold water air conditioning mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port b of the second four-way reversing valve (18), an air heat exchanger (1), a first stop valve (3), a port a of the liquid storage tank (9), a port c of the liquid storage tank (9), a third electronic expansion valve (7), a load (10), a port d of the first four-way reversing valve (14), a port c of the first four-way reversing valve (14), a first check valve (11), a refrigerant port of the gas-liquid separator (12), a refrigerant outlet of the gas-liquid separator (12) and then returns to the compressor (19); ③Hot water and air conditioning mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a first stop valve (16), a hot water heat exchanger (15), a second stop valve (6), a port of the liquid storage tank (9), a port of the liquid storage tank (9), a third electronic expansion valve (7), a load (10), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a first check valve (11), a refrigerant port of the gas-liquid separator (12), and a refrigerant outlet of the gas-liquid separator (12) before returning to the compressor (19); ④Swimming pool heating and heat storage mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a second stop valve (17), a refrigerant flow path of the swimming pool (4), a second stop valve (6), a port of the liquid storage tank (9), a port of the liquid storage tank (9), a first electronic expansion valve (2), an air heat exchanger (1), a port of the second four-way reversing valve (18), a port of the second four-way reversing valve (18), a second check valve (13), another refrigerant port of the gas-liquid separator (12), and a refrigerant outlet of the gas-liquid separator (12) before returning to the compressor (19); ⑤Swimming pool cooling and cold storage mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the air heat exchanger (1), a port b of the second four-way reversing valve (18), an air heat exchanger (1), a first stop valve (3), a port a of the liquid storage tank (9), a port b of the liquid storage tank (9), a second electronic expansion valve (5), a refrigerant flow path of the swimming pool (4), a second stop valve (17), a port b of the first four-way reversing valve (14), a port c of the first four-way reversing valve (14), a first check valve (11), a refrigerant port of the gas-liquid separator (12), and a refrigerant outlet of the gas-liquid separator (12) before returning to the compressor (19); ⑥Swimming pool heat storage heating mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a load (10), a third stop valve (8), a port of the liquid storage tank (9), a port of the liquid storage tank (9), a second electronic expansion valve (5), a refrigerant flow path of the swimming pool (4), a second stop valve (17), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a first check valve (11), a refrigerant port of the gas-liquid separator (12), a refrigerant outlet of the gas-liquid separator (12) and then returns to the compressor (19); ⑦ Pool swimming cold storage air conditioning mode The compressor (19) is working, and the refrigerant of the compressor (19) passes through the second four-way reversing valve (18) in sequence. a port of the second four-way reversing valve (18), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a second stop valve (17), a refrigerant flow path of the swimming pool (4), a second stop valve (6), a port of the liquid storage tank (9), a port of the liquid storage tank (9), a third electronic expansion valve (7), a load (10), a port of the first four-way reversing valve (14), a port of the first four-way reversing valve (14), a first check valve (11), a refrigerant port of the gas-liquid separator (12), and a refrigerant outlet of the gas-liquid separator (12) before returning to the compressor (19); In the above seven modes, the photovoltaic power source (20) and the mains power source (21) provide working power for the compressor (19) according to actual conditions, and the power supply method is as follows: When the season is winter and the electricity price is in the valley period, and the client load (10) has no heat load demand, the unit performs valley power energy storage operation, stores heat in the swimming pool (4), and operates in the swimming pool heating and heat storage mode until the valley power time ends; When the season is summer and the electricity price is in the valley period, and the client load (10) has no cooling load and hot water demand, the unit performs valley power energy storage operation, and stores cold energy in the swimming pool (4). The mode is in accordance with the swimming pool cooling and cold storage mode, and the condition for starting this mode is: the cold storage is started only when the swimming pool (4) water temperature value T1 is greater than the customer's swimming pool (4) set value, and after storing cold energy, the swimming pool (4) water temperature is not lower than the customer's swimming pool (4) set water temperature of 0°C to -3°C, so as not to affect the customer's use experience; When the season is winter and the electricity price is in the valley, and the client load (10) has a heat load demand, the unit directly operates in the above hot water mode or swimming pool heat storage heating mode; When the season is summer and the electricity price is in the valley period, and the client load (10) has a cooling load or hot water demand, the unit operates in the cold water air conditioning mode or the hot water and air conditioning mode or the hot water mode; When the season is winter and the electricity price is at the peak or peak period, and the client load (10) has no heat load demand, the unit does not store valley power energy and is in standby mode; When the electricity price is at peak or peak time in winter, and the client load (10) has a heat load demand, the current swimming pool (4) water temperature T1 and the ambient temperature T2 are determined. If T1>T2, the unit enters the swimming pool heat storage heating mode; if T1≤T2, the unit enters the swimming pool heat storage heating mode; the hot water mode is not affected by this and is turned on according to customer demand; When the electricity price is at peak or peak time in summer and the client load (10) has a cooling load demand, the current swimming pool (4) water temperature T1 and the ambient temperature T2 are determined. If T1 < T2, the unit enters the swimming pool cold storage air conditioning mode; if T1 ≥ T2, the unit enters the cold water air conditioning mode; the hot water mode is not affected by this and is turned on according to customer demand.

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