Heat pump system

Abstract

The utility model provides a kind of heat pump system, it is related to heat pump technical field.The heat pump system includes heat pump unit, solar energy collector and energy storage water tank, wherein, heat pump unit has indoor heat exchanger and outdoor heat exchanger;Energy storage water tank is connected with outdoor heat exchanger by first pipeline to form first water circuit circulation, and first pipeline is equipped with first water pump;Energy storage water tank is connected with solar energy collector by second pipeline to form second water circuit circulation, and second pipeline is equipped with second water pump.The heat pump system can realize defrosting of outdoor heat exchanger in heat pump system under low temperature environment at low cost, and ensure the heat supply of heat pump system.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and more specifically, to a heat pump system. Background Technology

[0002] Heat pump systems provide heating or cooling by absorbing ambient heat energy, exhibiting high energy efficiency and serving as crucial equipment for clean energy utilization. In low-temperature environments, where heat pump systems are primarily used for heating, the outdoor heat exchanger, located in such environments, is prone to frosting. This frosting leads to decreased heat transfer performance, deterioration of the refrigerant circulation within the heat pump system, and consequently, a sharp reduction in the heating capacity of the indoor heat exchanger. Furthermore, it causes a series of problems, including mechanical damage to the heat pump system materials.

[0003] Among the technologies related to heat pump systems, the defrosting methods for outdoor heat exchangers mainly include reverse circulation, electric heating, and ultrasonic methods. Among these, reverse circulation can cause a sharp drop in room temperature and increase energy consumption; electric heating relies on high-grade electrical energy and is not economical; and ultrasonic methods can cause pipe resonance and are not very effective.

[0004] Therefore, how to solve the defrosting of the outdoor heat exchanger in the heat pump system at low cost and ensure the heating supply of the heat pump system is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this utility model is to provide a heat pump system to solve the technical problem of how to achieve defrosting of the outdoor heat exchanger in the heat pump system at low cost in low-temperature environments and ensure the heating supply of the heat pump system.

[0006] To solve the above problems, this utility model provides a heat pump system, including:

[0007] Heat pump units have indoor and outdoor heat exchangers;

[0008] Solar collectors; and,

[0009] An energy storage tank is connected to the outdoor heat exchanger via a first pipeline to form a first water circulation circuit, and the first pipeline is equipped with a first water pump; the energy storage tank is connected to the solar collector via a second pipeline to form a second water circulation circuit, and the second pipeline is equipped with a second water pump.

[0010] In the heat pump system provided by this utility model, by setting up an energy storage water tank and a solar collector, and forming different water circuits with the outdoor heat exchanger and solar collector of the heat pump unit, the heat pump system has three circuits: refrigerant circulation, first water circuit circulation, and second water circuit circulation. The circulation direction of the refrigerant circulation can be adjusted to allow the heat pump unit to enter the cooling mode or the heating mode, so as to realize the cooling or heating function of the heat pump system for the indoor environment. When exposed to sunlight, the second water circulation can be activated to put the heat pump system into solar thermal storage mode, storing energy in the energy storage tank at low cost. In heating mode, when the outdoor heat exchanger is frosted, the first water circulation can be activated to put the heat pump system into energy storage defrosting mode. The heat stored in the energy storage tank through solar energy is used to heat and defrost the outdoor heat exchanger, thus achieving defrosting of the outdoor heat exchanger at low cost. During the defrosting process, with the refrigerant circulation of the heat pump unit continuing to run, the removal of frost on the outer wall of the outdoor heat exchanger and the heating of the refrigerant in the refrigerant circulation by the hot water in the first water circulation can doubly improve the heat exchange efficiency of the outdoor heat exchanger, thereby ensuring the stable and effective heating of the heat pump system.

[0011] Meanwhile, in cooling mode, the first water circulation can be activated to put the heat pump system into condensation heat recovery mode, storing energy in the energy storage tank for use as hot water and other heat energy supply to users. The heat pump system has higher functionality, and the heat exchange between the first water circulation and the outdoor heat exchanger can improve the heat dissipation efficiency of the outdoor heat exchanger, further improving the cooling effect of the heat pump system.

[0012] Optionally, the heat pump system has:

[0013] Energy storage defrosting mode: The heat pump unit operates in heating mode, and the first water pump starts running;

[0014] Condensation heat recovery mode: The heat pump unit operates in cooling mode, and the first water pump starts running; and,

[0015] Photothermal storage mode: The second water pump starts running.

[0016] Optionally, the heat pump system further includes a terminal heat exchanger, which is connected to the indoor heat exchanger via a third pipeline to form a third water circulation circuit, and the third pipeline is equipped with a third water pump.

[0017] Optionally, the solar collector and the terminal heat exchanger are connected by a fourth pipeline to form a fourth water circulation; the fourth pipeline is equipped with a fourth water pump, or at least one of the pipeline section where the second water pump is located and the pipeline section where the third water pump is located is a part of the fourth pipeline.

[0018] Optionally, the heat pump system further includes a first regulating valve and a second regulating valve, the first regulating valve having a first valve port A, a second valve port A and a third valve port A, and the second regulating valve having a first valve port B, a second valve port B and a third valve port B;

[0019] The energy storage tank has a first interface and a second interface. The first interface is connected to the first valve port A, and the second interface is connected to the first valve port B. The first pipeline is connected to the second valve port A and the second valve port B respectively at both ends of the energy storage tank, and the second pipeline is connected to the third valve port A and the third valve port B respectively at both ends of the energy storage tank.

[0020] Optionally, the heat pump system further includes a terminal heat exchanger, which is connected to the indoor heat exchanger via a third pipeline to form a third water circulation circuit, and the third pipeline is equipped with a third water pump;

[0021] The first regulating valve also has a fourth valve port A, and the second regulating valve also has a fourth valve port B; the third pipeline located on both sides of the terminal heat exchanger is respectively provided with a first three-way valve and a second three-way valve, the branch valve port A of the first three-way valve is connected to the fourth valve port B through a first connecting pipeline, and the branch valve port B of the second three-way valve is connected to the fourth valve port A through a second connecting pipeline.

[0022] Optionally, the heat pump system has a solar thermal heating mode: the third valve port A is connected to the fourth valve port A, the third valve port B is connected to the fourth valve port B, the branch valve port A and the branch valve port B are both connected to the terminal heat exchanger, and the second water pump starts to run.

[0023] Optionally, the heat pump system has a heating and defrosting mode: the second valve port A is connected to the fourth valve port A, the second valve port B is connected to the fourth valve port B, all three valve ports of the first three-way valve are connected, all three valve ports of the second three-way valve are connected, the heat pump unit is in heating operation, and both the first water pump and the third water pump are started and running.

[0024] Optionally, the heat pump system has an off-peak electricity heat storage mode: the third valve port A is connected to the fourth valve port A, the first valve port A is connected to the second valve port A, the first valve port B is connected to the third valve port B, the second valve port B is connected to the fourth valve port B, all three valve ports of the first three-way valve are connected, all three valve ports of the second three-way valve are connected, the heat pump unit operates in heating mode, and the third water pump, the first water pump, and the second water pump are all started and running.

[0025] Optionally, the energy storage tank is provided with a cold water inlet and a hot water outlet, the cold water inlet is provided with a cold water valve, and the hot water outlet is provided with a hot water valve.

[0026] Optionally, the energy storage tank is provided with a cold water inlet and a hot water outlet. The cold water inlet is provided with a cold water valve, and the hot water outlet is provided with a hot water valve. The energy storage tank includes a phase change material and a heat storage tube inserted in the phase change material. A heat exchange tube is sleeved inside the heat storage tube. The first end of the heat storage flow channel between the heat storage tube and the heat exchange tube serves as the first interface, and the second end serves as the second interface. The first end of the heat exchange tube serves as the cold water inlet, and the second end serves as the hot water outlet. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 A first flowchart of the heat pump system provided by this utility model;

[0029] Figure 2 A second flowchart of the heat pump system provided by this utility model;

[0030] Figure 3 The third flow chart of the heat pump system provided by this utility model;

[0031] Figure 4 The fourth flow chart of the heat pump system provided by this utility model;

[0032] Figure 5 The fifth flowchart of the heat pump system provided by this utility model;

[0033] Figure 6 A schematic diagram of an outdoor heat exchanger using a finned heat exchanger in the heat pump system provided by this utility model.

[0034] Figure 7 This is a schematic diagram of one form of the energy storage water tank in the heat pump system provided by this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100-Heat pump unit; 110-Indoor heat exchanger; 120-Outdoor heat exchanger; 121-Fins; 122-First heat pipe; 123-Second heat pipe; 130-Refrigerant piping; 140-Compressor; 150-Gas-liquid separator; 160-Four-way valve; 170-Expansion valve; 180-Liquid receiver; 200-Solar collector; 300-Storage water tank; 310-First interface; 320-Second interface; 330-Cold water inlet; 340-Hot water outlet; 350-Phase change heat storage layer; 360-Heat storage pipe; 370-Heat exchange pipe; 380-Heat storage channel; 390-Insulation layer; 400-Terminal heat exchanger; 810-First regulator Regulating valve; 811-First valve port A; 812-Second valve port A; 813-Third valve port A; 814-Fourth valve port A; 820-Second regulating valve; 821-First valve port B; 822-Second valve port B; 823-Third valve port B; 824-Fourth valve port B; 830-First three-way valve; 831-Branch valve port A; 840-Second three-way valve; 841-Branch valve port B; 850-Cold water valve; 860-Hot water valve; 910-First pipeline; 911-First water pump; 920-Second pipeline; 921-Second water pump; 930-Third pipeline; 931-Third water pump; 941-First connecting pipeline; 942-Second connecting pipeline. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0038] This embodiment provides a heat pump system, such as Figure 1 As shown, the system includes a heat pump unit 100, a solar collector 200, and an energy storage tank 300. The heat pump unit 100 has an indoor heat exchanger 110 and an outdoor heat exchanger 120. The energy storage tank 300 and the outdoor heat exchanger 120 are connected through a first pipeline 910 to form a first water circulation circuit, and the first pipeline 910 is equipped with a first water pump 911. The energy storage tank 300 and the solar collector 200 are connected through a second pipeline 920 to form a second water circulation circuit, and the second pipeline 920 is equipped with a second water pump 921.

[0039] In the heat pump system provided in this embodiment, the outdoor heat exchanger 120 of the heat pump unit 100 is arranged in the outdoor environment and can exchange heat with the outdoor environment; the indoor heat exchanger 110 of the heat pump unit 100 can be arranged in the indoor environment or the outdoor environment, directly or indirectly heating or cooling the indoor environment, or heating cold water to provide hot water to the outside; the solar collector 200 is arranged in the outdoor environment and absorbs solar energy and converts it into heat energy to heat the water flowing through it.

[0040] The heat pump unit 100 specifically includes a compressor 140, a four-way valve 160, an outdoor heat exchanger 120, an expansion valve 170, and an indoor heat exchanger 110. The components are connected by refrigerant pipes 130 to form a refrigerant circulation. When the heat pump unit 100 is turned on, the flow direction of the four-way valve 160 can be adjusted as needed to position the outdoor heat exchanger 120 downstream of the compressor 140, in which case the heat pump unit 100 enters the cooling mode and the indoor heat exchanger 110 cools the indoor environment; or, if the indoor heat exchanger 110 is positioned downstream of the compressor 140, the heat pump unit 100 enters the heating mode, and the indoor heat exchanger 110 operates in heating mode to provide heat to the indoor environment or supply hot water to the outside.

[0041] The outdoor heat exchanger 120 has two flow paths. The first flow path connects to the refrigerant pipe 130 of the heat pump unit 100 to form a refrigerant circulation, and the second flow path connects to the first pipe 910 to form a first water circulation. When the heat pump unit 100 enters cooling mode, the outdoor heat exchanger 120 exchanges heat with the outdoor environment and dissipates heat. The refrigerant flowing through the first flow path is at a high temperature, which can start the first water pump 911. The heat pump system enters the condensation heat recovery mode. The second flow path of the outdoor heat exchanger 120, the first pipe 910, and the energy storage tank 300 are connected to form a closed-loop first water circulation. Figure 1 As indicated by the middle arrow, the water inside circulates continuously along the first water path under the drive of the first water pump 911. The cold water flowing out of the energy storage tank 300 exchanges heat with the high-temperature refrigerant in the first water path when it flows through the second flow path, becoming hot water. The hot water flowing out through the second flow path then flows into the energy storage tank 300 for energy storage, thereby storing thermal energy in the energy storage tank 300. At the same time, the heat exchange between the first and second flow paths can also improve the heat exchange efficiency of the outdoor heat exchanger 120, thereby improving the cooling effect of the heat pump unit 100 and the heat pump system.

[0042] When the sun shines on the solar collector 200 during the day, the second water pump 921 can be activated, and the heat pump system enters the solar thermal storage mode. The energy storage tank 300, the solar collector 200, and the second pipeline 920 are connected to form a closed-loop second water circulation system. Figure 1 As indicated by the middle arrow, the water inside can circulate continuously along the second water path under the drive of the second water pump 921. The cold water flowing out of the energy storage tank 300 flows to the solar collector 200, and when it flows through the solar collector 200, it can absorb heat and become hot water. The hot water flows into the energy storage tank 300 to store energy, thereby storing thermal energy in the energy storage tank 300.

[0043] When the heat pump system enters heating mode, the outdoor heat exchanger 120 absorbs heat by exchanging heat with the outdoor environment. When frost forms on the outdoor heat exchanger 120, the first water pump 911 can be started, and the heat pump system simultaneously enters energy storage defrosting mode. Figure 1 As indicated by the middle arrow, the water in the second water circulation loop circulates under the drive of the first water pump 911. Hot water flows out of the energy storage tank 300, which stores thermal energy. As the hot water flows through the second water loop, it exchanges heat with the outer shell of the outdoor heat exchanger 120, heating it and thus defrosting the outdoor heat exchanger 120. This ensures the heat exchange efficiency of the outdoor heat exchanger 120 and the heating effect of the heat pump system. Simultaneously, the heat exchange between the hot water in the second water loop and the refrigerant in the first water loop, as well as the outdoor heat exchanger 120, further improves the heat exchange efficiency of the outdoor heat exchanger 120 and the heating effect of the heat pump system.

[0044] In the heat pump system provided in this embodiment, by setting up an energy storage tank 300 and a solar collector 200, and forming different water circuits with the outdoor heat exchanger 120 and the solar collector 200 of the heat pump unit 100, the heat pump system has three circuits: refrigerant circulation, first water circuit circulation, and second water circuit circulation. The circulation direction of the refrigerant circulation can be adjusted to allow the heat pump unit 100 to enter the cooling mode or the heating mode, so as to realize the cooling or heating function of the heat pump system for the indoor environment. When exposed to sunlight, the second water circulation can be activated to put the heat pump system into a solar thermal storage mode, storing energy in the energy storage tank 300 at low cost. In heating mode, when the outdoor heat exchanger 120 is frosted, the first water circulation can be activated to put the heat pump system into an energy storage defrosting mode. The heat energy stored in the energy storage tank 300 through solar energy is used to heat and defrost the outdoor heat exchanger 120, thereby achieving defrosting of the outdoor heat exchanger 120 at low cost. During the defrosting process, on the basis of the continuous operation of the refrigerant circulation of the heat pump unit 100, the removal of the frost layer on the outer wall of the outdoor heat exchanger 120 and the heating of the refrigerant in the refrigerant circulation by the hot water in the first water circulation can doubly improve the heat exchange efficiency of the outdoor heat exchanger 120, thereby ensuring the stable and effective heating of the heat pump system.

[0045] Meanwhile, in cooling mode, the first water circulation can be activated to enable the heat pump system to enter condensation heat recovery mode, storing energy in the energy storage tank 300 for use as a source of hot water and other heat energy for users. This enhances the functionality of the heat pump system. Furthermore, the heat exchange between the first water circulation and the outdoor heat exchanger 120 improves the heat dissipation efficiency of the outdoor heat exchanger 120, further enhancing the cooling effect of the heat pump system.

[0046] In summary, this heat pump system features a solar thermal storage mode, a condensation heat recovery mode, and an energy storage defrost mode. In solar thermal storage mode, the second water pump 921 starts operating; in condensation heat recovery mode, heat pump unit 100 operates in cooling mode, and the first water pump 911 starts operating; in energy storage defrost mode, heat pump unit 100 operates in heating mode, and the first water pump 911 starts operating. The heat pump system can be adjusted to different modes as needed to achieve low-cost, high-efficiency cooling and heating.

[0047] Specifically, the outdoor heat exchanger 120 can be a finned heat exchanger 121, such as... Figure 6 As shown, a first heat pipe 122 and a second heat pipe 123 are installed inside the fin 121. The first heat pipe 122 serves as a first flow path and is connected to the refrigerant pipe 130 to form a refrigerant circulation. The second heat pipe 123 serves as a second flow path and is connected to the first pipe 910 to form a first water circulation. Figure 1 As shown, the refrigerant pipeline 130 of the heat pump unit 100 is also equipped with a gas-liquid separator 150 and a liquid receiver 180 to protect and stabilize the operation of the pump unit.

[0048] In this embodiment, as Figure 2 As shown, the heat pump system also includes a terminal heat exchanger 400, which is connected to the indoor heat exchanger 110 via a third pipe 930 to form a third water circulation. The third pipe 930 is equipped with a third water pump 931. On the one hand, when the heat pump unit 100 is running, the user can determine the start / stop status of the third water pump 931 according to the cooling and heating needs of the indoor environment. By adjusting the operating status of the third water circulation, the cooling or heating of the indoor environment by the terminal heat exchanger 400 is independent of the operation of the heat pump unit 100, thereby improving the convenience of independent control of each mode in the heat pump system. For example, during off-peak electricity conditions, when the heat pump unit 100 is running in cooling mode, it only needs to enter the condensation heat recovery mode to store heat energy in the energy storage tank 300, and does not need to cool the indoor environment, so the third water pump 931 can be turned off. On the other hand, the heat pump unit 100 has a high degree of overall integrity. The terminal heat exchanger 400 is connected to the indoor heat exchanger 110 through the third pipe 930. By setting the arrangement of the third pipe 930, the terminal heat exchanger 400 can be adapted to different layout scenarios, thereby improving the ease of use and applicability of the heat pump system.

[0049] In this embodiment, the solar collector 200 and the terminal heat exchanger 400 are connected via a fourth pipeline to form a fourth water circulation loop. The fourth pipeline is equipped with a fourth water pump, or at least one of the pipeline sections containing the second water pump 921 and the third water pump 931 serves as a portion of the fourth pipeline. The fourth pipeline can be separately installed from the second pipeline 920 and the third pipeline 930; in this case, a fourth water pump is required to drive the water circulating in the fourth pipeline. Alternatively, at least one of the pipeline sections containing the second water pump 921 in the second pipeline 920 and the pipeline sections containing the third water pump 931 in the third pipeline 930 simultaneously serves as a portion of the fourth pipeline, such as... Figure 3 As shown, the second pipeline 920 forms the second water circulation while also serving as a section of the fourth pipeline, forming the fourth water circulation together with other sections of the fourth pipeline. The second water pump 921 arranged in the second pipeline 920 can serve as the water flow driving source for the second water circulation and also as the water flow driving source for the fourth water circulation.

[0050] When there is sufficient sunlight, the solar collector 200 has a high capacity for absorbing and converting solar energy. The solar collector 200, the terminal heat exchanger 400, and the fourth pipe can be adjusted to form a connected fourth water circulation system. Then, the second water pump 921 is started, and the heat pump system enters the solar thermal heating mode. Figure 3 As indicated by the middle arrow, water, driven by the second water pump 921, can continuously circulate along the fourth water path. The water flowing through the solar collector 200 is heated into hot water, which then flows through the terminal heat exchanger 400 to dissipate heat to the outdoor environment, thus heating the indoor environment. The cooled water that flows out of the terminal heat exchanger 400 after dissipating heat flows back to the solar collector 200, and so on, thus realizing the use of solar energy to heat the indoor environment, thereby improving the functionality of the heat pump system and reducing its cost for heating the indoor environment under conditions of sufficient sunlight.

[0051] In this embodiment, the heat pump system further includes a first regulating valve 810 and a second regulating valve 820. The first regulating valve 810 has a first valve port A811, a second valve port A812, and a third valve port A813. The second regulating valve 820 has a first valve port B821, a second valve port B822, and a third valve port B823. The energy storage tank 300 has a first interface 310 and a second interface 320. The first interface 310 is connected to the first valve port A811, and the second interface 320 is connected to the first valve port B821. The first pipeline 910 is connected to the second valve port A812 and the second valve port B822 at the two ends corresponding to the energy storage tank 300, respectively. The second pipeline 920 is connected to the third valve port A813 and the third valve port B823 at the two ends corresponding to the energy storage tank 300, respectively.

[0052] One of the first interface 310 and the second interface 320 serves as the water inlet, and the other serves as the water outlet. By setting the first regulating valve 810 and the second regulating valve 820 to connect with the first interface 310, the second interface 320, the first pipeline 910, and the second pipeline 920, the energy storage tank 300 only needs to set one set of water inlet and water outlet to simultaneously achieve connection with the first pipeline 910 and the second pipeline 920. That is, the water path in the energy storage tank 300 serves as part of the first water path circulation and the second water path circulation, eliminating the need to set two water paths in the energy storage tank 300, thereby improving the structural simplicity of the energy storage tank 300.

[0053] Specifically, such as Figure 1 and Figure 2 As shown, the first valve port A811 and the second valve port A812 of the first regulating valve 810 can be connected, and the first valve port B821 and the second valve port B822 of the second regulating valve 820 can be connected, so that the first water circulation is connected and the first water pump 911 is turned on, so that the heat pump system enters the energy storage defrosting mode or the condensation heat recovery mode. In addition, the first valve port A811 and the third valve port A813 of the first regulating valve 810 can be connected, and the first valve port B821 and the third valve port B823 of the second regulating valve 820 can be connected, so that the second water circulation is connected and the second water pump 921 is turned on, so that the heat pump system enters the solar thermal storage mode.

[0054] When the heat pump system is equipped with a terminal heat exchanger 400, in this embodiment, the first regulating valve 810 also has a fourth valve port A814, and the second regulating valve 820 also has a fourth valve port B824; the third pipeline 930 is provided with a first three-way valve 830 and a second three-way valve 840 on both sides of the terminal heat exchanger 400, respectively. The branch valve port A831 of the first three-way valve 830 is connected to the fourth valve port B824 through the first connecting pipeline 941, and the branch valve port B841 of the second three-way valve 840 is connected to the fourth valve port A814 through the second connecting pipeline 942. The section of the third pipe 930 connected to the inlet side of the terminal heat exchanger 400 is pipe section A, and the section of the third pipe 930 connected to the outlet side of the terminal heat exchanger 400 is pipe section B. The first three-way valve 830 is installed in pipe section A, and the second three-way valve 840 is installed in pipe section B. Both the first three-way valve 830 and the second three-way valve 840 are three-way valves, and any two or three valve ports in the three-way valves can be adjusted to be in a connected state as needed. The first regulating valve 810 and the second regulating valve 820 are both four-way valves 160, specifically four-way ball valves that do not require pressure difference drive, and can be adjusted so that every two valve ports in the four-way valve 160 are in a connected state.

[0055] In use, the second pipe 920, the first connecting pipe 941, pipe section A, pipe section B, and the second connecting pipe 942 together form the fourth pipe. The second pipe 920, pipe section A, pipe section B, and the second water pump 921 are utilized multiple times to improve the functionality of the heat pump system and reduce its cost. The second pipe 920, the solar collector 200, the first connecting pipe 941, pipe section A, the terminal heat exchanger 400, pipe section B, and the second connecting pipe 942 together form the fourth water circulation path. When there is sufficient sunlight, the solar collector 200... The solar energy absorption and conversion capacity is high. The third valve port A813 and the fourth valve port A814 of the first regulating valve 810 are connected, the third valve port B823 and the fourth valve port B824 of the second regulating valve 820 are connected, the branch valve port A831 of the first three-way valve 830 is connected to pipe section A, and the branch valve port B841 of the second three-way valve 840 is connected to pipe section B. Thus, the fourth water circulation circuit formed by the solar collector 200, the terminal heat exchanger 400, and the fourth pipe is connected. Then, the second water pump 921 is started, and the heat pump system enters the solar thermal heating mode. Figure 3 As indicated by the middle arrow, water can circulate continuously along the fourth water path under the drive of the second water pump 921, so as to realize the use of solar energy to heat the indoor environment, thereby improving the functionality of the heat pump system and reducing its cost of heating the indoor environment under sufficient sunlight conditions.

[0056] In addition to the solar thermal heating mode mentioned above, heat pump systems also have a heating defrosting mode and an off-peak electricity storage mode.

[0057] Heating and defrosting mode: The second valve port A812 is connected to the fourth valve port A814, the second valve port B822 is connected to the fourth valve port B824, all three ports of the first three-way valve 830 are connected, all three ports of the second three-way valve 840 are connected, the third water circulation circuit is connected, the heat pump unit 100 operates in heating mode, and both the first water pump 911 and the third water pump 931 are started. The first three-way valve 830 is located on the outlet side of the first water pump 911 and the third water pump 931. When there is insufficient sunlight in cold winters, the heat pump unit 100 is adjusted to enter heating mode, and the third water pump 931 is started to circulate the water in the third water circulation circuit, so as to heat the indoor environment through the terminal heat exchanger 400; where, if Figure 4As indicated by the middle arrow, the temperature of the warm water flowing out of the terminal heat exchanger 400 is still higher than the frosting temperature. When the warm water flowing out of the terminal heat exchanger 400 reaches the second three-way valve 840, most of the warm water flows through the main path of the second three-way valve 840 to the indoor heat exchanger 110. A small portion of the warm water flows through the branch valve port B841 into the second connecting pipe 942, and then through the fourth valve port A814 and the second valve port A812 into the first pipe 910, and then into the second flow path of the outdoor heat exchanger 120 to heat and defrost the outdoor heat exchanger 120. The cold water flowing out of the second flow path is then driven by the first water pump 911 and continues to flow through the second valve port B822 and the fourth valve port B824 to the first connecting pipe 941. Then, through the branch valve port A831, it merges with the hot water flowing into the pipe section A of the indoor heat exchanger 110 and enters the terminal heat exchanger 400 to heat the indoor environment.

[0058] In this heating and defrosting mode, the heat pump unit 100 continues to operate in heating mode and can still provide heat to the indoor environment. Although some heat supply to the indoor environment is lost, the heat exchange effect of the outdoor heat exchanger 120 is enhanced after defrosting, and the heating capacity of the heat pump system to the indoor environment is improved. This achieves defrosting of the outdoor heat exchanger 120 and ensures stable heating to the indoor environment, thereby improving user comfort.

[0059] Off-peak electricity heat storage mode: The third valve port A813 is connected to the fourth valve port A814, the first valve port A811 is connected to the second valve port A812, the first valve port B821 is connected to the third valve port B823, the second valve port B822 is connected to the fourth valve port B824, all three valve ports of the first three-way valve 830 are connected, all three valve ports of the second three-way valve 840 are connected, the heat pump unit is operating at 100% heating capacity, and the third water pump 931, the first water pump 911 and the second water pump 921 are all started and running. The second regulating valve 820 is located on the outlet side of the first water pump 911 and the second water pump 921, and the first three-way valve 830 is located on the outlet side of the first water pump 911 and the third water pump 931. During off-peak electricity use in cold winters, the heat pump unit 100 is regulated to enter heating mode, and the third water pump 931 is started to circulate the water in the third water circuit, so as to heat the indoor environment through the terminal heat exchanger 400; wherein, for example Figure 5As indicated by the middle arrow, the temperature of the warm water flowing out of the terminal heat exchanger 400 is still higher than the frosting temperature. When the warm water flowing out of the terminal heat exchanger 400 reaches the second three-way valve 840, most of the warm water flows to the indoor heat exchanger 110 through the main path of the second three-way valve 840. A small portion of the warm water flows into the second connecting pipe 942 through the branch valve port B841, and then into the second pipe 920 and the solar collector 200 through the fourth valve port A814 and the third valve port A813. The warm water in the second pipe 920 continues to flow through the third valve port B823 and... The first valve port B821 flows into the energy storage tank 300, where the heat energy is stored. The cooled water flows out of the energy storage tank 300 and then flows into the first pipeline 910 through the first valve port A811 and the second valve port A812. Driven by the first water pump 911, it continues to flow through the second valve port B822 and the fourth valve port B824 to the first connecting pipeline 941. Then, it flows through the branch valve port A831 to merge with the hot water flowing into pipeline section A of the indoor heat exchanger 110 and enters the terminal heat exchanger 400 to heat the indoor environment.

[0060] Among them, the off-peak electricity heat storage mode can utilize the relatively inexpensive off-peak electricity to convert electrical energy into heat energy stored in the energy storage tank 300. The heat energy in the energy storage tank 300 can be used to defrost the outdoor heat exchanger 120 or to provide hot water to the outside, thereby further improving the functionality of the heat pump system.

[0061] The heat pump system provided in this embodiment is a heat pump cycle based on the synergy of solar thermal, off-peak electricity and phase change heat storage, which realizes the recovery and utilization of different heat sources, greatly improves energy utilization, and achieves efficient and clean cycle operation. At the same time, through the synergistic effect and flexible switching of solar thermal, off-peak electricity and phase change heat storage, a heat pump system operation method based on the synergy of solar thermal, off-peak electricity and phase change heat storage is constructed, which overcomes the problem of operational instability caused by the intermittency of solar energy, realizes efficient defrosting and heating in low-temperature extreme environments, and provides a reliable technical path for heat pump systems under extreme climatic conditions.

[0062] Specifically, in this embodiment, the energy storage tank 300 may include a tank body containing a phase change material. A heat storage pipe 360 ​​is inserted through the phase change material. The two ends of the heat storage pipe 360 ​​are respectively connected to the first interface 310 and the second interface 320 of the tank body. In the condensation heat recovery mode, the solar thermal heat storage mode, or the off-peak electricity heat storage mode, hot water that has undergone heat exchange with the outdoor heat exchanger 120, been heated by the solar collector 200, or diverted through the third pipe 930 flows into the heat storage pipe 360 ​​through one of the first interface 310 and the second interface 320. The heat storage pipe 360 ​​transfers heat to the phase change material, thereby storing the thermal energy in the phase change material. The cooled water flows out through the other of the first interface 310 and the second interface 320. This cycle continues, continuously storing thermal energy in the energy storage tank 300. In the energy storage defrosting mode, the cold water that has exchanged heat with the outdoor heat exchanger 120 flows into the heat storage pipe 360. The phase change material heats the cold water in the heat storage pipe 360. The heated hot water flows out and flows back to the outdoor heat exchanger 120. This cycle continues, transferring the heat energy stored in the phase change material in the energy storage tank 300 to the outdoor heat exchanger 120, thus achieving defrosting of the outdoor heat exchanger 120.

[0063] In this embodiment, as Figure 2 As shown, the energy storage tank 300 is equipped with a cold water inlet 330 and a hot water outlet 340. The cold water inlet 330 is equipped with a cold water valve 850, and the hot water outlet 340 is equipped with a hot water valve 860. In use, the cold water inlet 330 is connected to a cold water source. When the energy storage tank 300 stores heat energy through a solar thermal storage mode or a condensation heat recovery mode, and the user needs to use hot water, the cold water valve 850 and the hot water valve 860 can be opened. The cold water source inputs cold water into the energy storage tank 300 through the cold water inlet 330, and hot water is delivered to the user through the hot water outlet and the hot water valve 860, thereby improving the functionality of the energy storage tank 300 and the heat pump system.

[0064] In this embodiment, as Figure 7As shown, a heat exchange tube 370 is installed inside the heat storage tube 360. The first end of the annular heat storage channel 380 formed between the heat storage tube 360 ​​and the heat exchange tube 370 serves as the first interface 310 and the second end serves as the second interface 320. The first end of the heat exchange tube 370 extends out of the heat storage tube 360 ​​and serves as the cold water inlet 330, and the second end extends out of the heat storage tube 360 ​​and serves as the hot water outlet. In this configuration, the energy storage tank 300 does not require an outer shell. The heat storage tube 360 ​​is covered with a phase change heat storage layer 350, which is further covered with an insulation layer 390. The heat storage tube 360, heat exchange tube 370, phase change heat storage layer 350, and insulation layer 390 are integrated into a single tube. Based on achieving heat energy storage and release, the energy storage tank 300 has a simpler structure, lower cost, and more convenient layout. When hot water is needed, the cold water valve 850 and hot water valve 860 are opened, and cold water is supplied to the heat exchange tube 370. The heat energy of the phase change material is transferred through the water in the heat storage tube 360 ​​to the cold water in the heat exchange tube 370 to heat it. The heated hot water in the heat exchange tube 370 then flows out, thus obtaining hot water.

[0065] The circulating water in the first, second, third, and fourth water circulation systems can be a composite aqueous solution with added ethylene glycol, serving as an antifreeze heat transfer medium.

[0066] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat pump system, characterized in that, include: A heat pump unit (100) has an indoor heat exchanger (110) and an outdoor heat exchanger (120); Solar collector (200); as well as, An energy storage tank (300) is connected to the outdoor heat exchanger (120) through a first pipeline (910) to form a first water circulation circuit, and the first pipeline (910) is equipped with a first water pump (911); the energy storage tank (300) is connected to the solar collector (200) through a second pipeline (920) to form a second water circulation circuit, and the second pipeline (920) is equipped with a second water pump (921).

2. The heat pump system according to claim 1, characterized in that, The heat pump system has the following features: Energy storage defrosting mode: The heat pump unit (100) operates in heating mode, and the first water pump (911) starts running; Condensation heat recovery mode: The heat pump unit (100) operates in cooling mode, and the first water pump (911) starts operating; and, Photothermal storage mode: The second water pump (921) starts running.

3. The heat pump system according to claim 1 or 2, characterized in that, The heat pump system also includes a terminal heat exchanger (400), which is connected to the indoor heat exchanger (110) through a third pipeline (930) to form a third water circulation. The third pipeline (930) is equipped with a third water pump (931).

4. The heat pump system according to claim 3, characterized in that, The solar collector (200) and the terminal heat exchanger (400) are connected by a fourth pipeline to form a fourth water circulation; the fourth pipeline is equipped with a fourth water pump, or at least one of the pipeline section where the second water pump (921) is located and the pipeline section where the third water pump (931) is located is a part of the fourth pipeline.

5. The heat pump system according to claim 1 or 2, characterized in that, The heat pump system further includes a first regulating valve (810) and a second regulating valve (820). The first regulating valve (810) has a first valve port A (811), a second valve port A (812) and a third valve port A (813). The second regulating valve (820) has a first valve port B (821), a second valve port B (822) and a third valve port B (823). The energy storage tank (300) has a first interface (310) and a second interface (320). The first interface (310) is connected to the first valve port A (811), and the second interface (320) is connected to the first valve port B (821). The first pipeline (910) is connected to the second valve port A (812) and the second valve port B (822) at its two ends corresponding to the energy storage tank (300), respectively. The second pipeline (920) is connected to the third valve port A (813) and the third valve port B (823) at its two ends corresponding to the energy storage tank (300), respectively.

6. The heat pump system according to claim 5, characterized in that, The heat pump system also includes a terminal heat exchanger (400), which is connected to the indoor heat exchanger (110) through a third pipeline (930) to form a third water circulation, and the third pipeline (930) is equipped with a third water pump (931). The first regulating valve (810) also has a fourth valve port A (814), and the second regulating valve (820) also has a fourth valve port B (824); the third pipeline (930) located on both sides of the terminal heat exchanger (400) is respectively provided with a first three-way valve (830) and a second three-way valve (840), the branch valve port A (831) of the first three-way valve (830) is connected to the fourth valve port B (824) through a first connecting pipeline (941), and the branch valve port B (841) of the second three-way valve (840) is connected to the fourth valve port A (814) through a second connecting pipeline (942).

7. The heat pump system according to claim 6, characterized in that, The heat pump system has a solar thermal heating mode: the third valve port A (813) is connected to the fourth valve port A (814), the third valve port B (823) is connected to the fourth valve port B (824), the branch valve port A (831) and the branch valve port B (841) are both connected to the terminal heat exchanger (400), and the second water pump (921) is started and running.

8. The heat pump system according to claim 6, characterized in that, The heat pump system has a heating and defrosting mode: the second valve port A (812) is connected to the fourth valve port A (814), the second valve port B (822) is connected to the fourth valve port B (824), all three valve ports of the first three-way valve (830) are connected, all three valve ports of the second three-way valve (840) are connected, the heat pump unit (100) is in heating operation, and the first water pump (911) and the third water pump (931) are both started.

9. The heat pump system according to claim 6, characterized in that, The heat pump system has a valley electricity heat storage mode: the third valve port A (813) is connected to the fourth valve port A (814), the first valve port A (811) is connected to the second valve port A (812), the first valve port B (821) is connected to the third valve port B (823), the second valve port B (822) is connected to the fourth valve port B (824), all three valve ports of the first three-way valve (830) are connected, all three valve ports of the second three-way valve (840) are connected, the heat pump unit (100) operates in heating mode, and the third water pump (931), the first water pump (911) and the second water pump (921) are all started and running.

10. The heat pump system according to claim 1 or 2, characterized in that, The energy storage tank (300) has a cold water inlet (330) and a hot water outlet (340). The cold water inlet (330) is equipped with a cold water valve (850), and the hot water outlet (340) is equipped with a hot water valve (860).

11. The heat pump system according to claim 5, characterized in that, The energy storage tank (300) has a cold water inlet (330) and a hot water outlet (340). The cold water inlet (330) is equipped with a cold water valve (850), and the hot water outlet (340) is equipped with a hot water valve (860). The energy storage tank (300) includes a phase change material and a heat storage tube (360) inserted in the phase change material. A heat exchange tube (370) is sleeved inside the heat storage tube (360). The first end of the heat storage flow channel (380) between the heat storage tube (360) and the heat exchange tube (370) serves as the first interface (310) and the second end serves as the second interface (320). The first end of the heat exchange tube (370) serves as the cold water inlet (330) and the second end serves as the hot water outlet (340).

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