Heat pump system and control method thereof

Abstract

The invention discloses a heat pump system and a control method thereof.The heat pump system is provided with a refrigerant flow path, the refrigerant flow path comprises a refrigerant circulation flow path and a refrigerant heat exchange flow path, the refrigerant circulation flow path is provided with a compressor, a four-way valve, an outdoor heat exchanger and an indoor heat exchanger, and the refrigerant heat exchange flow path is provided with a heat exchanger; a combined one-way valve structure is arranged on the refrigerant flow path, the four-way valve can switch the outdoor heat exchanger to communicate with an exhaust port of the compressor or an air return port of the compressor, and correspondingly, the combined one-way valve structure is used for switching a refrigerant from a first circulating flow state to a second circulating flow state. The heat pump system can be switched between a first circulating flow state and a second circulating flow state, in the first circulating flow state, a refrigerant passes through the outdoor heat exchanger, then flows through the heat exchanger and / or the indoor heat exchanger and returns into the compressor, and in the second circulating flow state, the refrigerant passes through the heat exchanger and / or the indoor heat exchanger and returns into the compressor. The air sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns into the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a heat pump system and a control method thereof. Background Art

[0002] Currently, the devices (gas, electric, solar, and heat pump water heaters) that provide domestic hot water for households and the devices (gas wall-mounted boilers, electric boilers, heat pumps) that provide heating are two sets of devices, with relatively high initial investment, installation costs, and operating costs. For this reason, related technologies have proposed a heat pump system for domestic hot water and heating. By paralleling a water tank or a heat storage module, it can simultaneously meet the needs of users for domestic hot water and heating. However, since a water tank or a heat storage module is paralleled in the heat pump system, multiple solenoid valves need to be added to achieve the switching between different modes, resulting in an increase in control difficulty and a significant increase in system cost. Summary of the Invention

[0003] The main object of the present invention is to propose a heat pump system and a control method thereof, aiming at the problem that the existing heat pump system needs multiple solenoid valves to achieve the switching between different modes.

[0004] To achieve the above object, the present invention proposes a heat pump system. A refrigerant flow path is formed on the heat pump system. The refrigerant flow path includes a refrigerant circulation flow path and a refrigerant heat exchange flow path. A compressor, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are provided on the refrigerant circulation flow path. A heat exchanger is provided on the refrigerant heat exchange flow path section, and a combined check valve structure is provided on the refrigerant flow path;

[0005] The four-way valve can switch the outdoor heat exchanger to communicate with the exhaust port or the suction port of the compressor. Correspondingly, the combined check valve structure is used to enable the refrigerant to switch from a first circulation state to a second circulation state, so that the heat pump system can switch between the first circulation state and the second circulation state;

[0006] In the first circulation state, after the refrigerant passes through the outdoor heat exchanger, it flows through the heat exchanger and / or the indoor heat exchanger and returns to the compressor;

[0007] In the second circulation state, after the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor.

[0008] Optionally, the refrigerant heat exchange flow path has a first flow path end and a second flow path end. The first flow path end is connected to the refrigerant circulation flow path and is located between the four-way valve and the indoor heat exchanger. The second flow path end is connected to the refrigerant circulation flow path and is located between the indoor heat exchanger and the outdoor heat exchanger;

[0009] The combined check valve structure includes a first check valve, a second check valve, and a third check valve. The first check valve is provided on the refrigerant circulation flow path and is located between the first flow path end and the indoor heat exchanger to unidirectionally guide the refrigerant flowing out of the indoor heat exchanger. The second check valve is provided on the refrigerant flow path and is located between the second flow path end and the outdoor heat exchanger to unidirectionally guide the refrigerant flowing through the outdoor heat exchanger flow path.

[0010] The refrigerant flow path further includes a diversion flow path. One end of the diversion flow path is connected between the first check valve and the indoor heat exchanger, and the other end of the diversion flow path is connected between the second check valve and the outdoor heat exchanger. The third check valve is provided on the diversion flow path to unidirectionally guide the refrigerant flowing out of the indoor heat exchanger.

[0011] Optionally, a first throttling element is provided on the refrigerant circulation flow path and is located between the second flow path end and the indoor heat exchanger; and / or,

[0012] A second throttling element is provided on the refrigerant heat exchange flow path and is located between the heat exchanger and the second flow path end; and / or,

[0013] A third throttling element is provided on the refrigerant circulation flow path and is located between the second check valve and the outdoor heat exchanger.

[0014] Optionally, when the refrigerant is in the first circulation state;

[0015] The first throttling element throttles, the second throttling element closes, and the third throttling element fully opens. After the refrigerant passes through the outdoor heat exchanger, it flows through the indoor heat exchanger and returns to the compressor, so that the heat pump system has a refrigeration mode; and / or,

[0016] The first throttling element closes, the second throttling element fully opens, and the third throttling element throttles. After the refrigerant passes through the outdoor heat exchanger, it flows through the heat exchanger and returns to the compressor, so that the heat pump system has a defrosting mode.

[0017] Optionally, the heat pump system further includes an indoor fan corresponding to the indoor heat exchanger. When the refrigerant is in the second circulation state;

[0018] The first throttling element throttles, the second throttling element fully opens, and the third throttling element throttles or fully opens, and the indoor fan is turned on. After the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor, so that the heat pump system has a heat storage refrigeration mode; and / or,

[0019] The first throttling element is fully open, the second throttling element is fully open, the third throttling element throttles, and the indoor blower is turned off. After the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor, so that the heat pump system has a heat storage mode; and / or,

[0020] The first throttling element throttles or is fully open, the second throttling element is fully open, the third throttling element throttles, and the indoor blower is turned on. After the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor, so that the heat pump system has a heat storage and heating mode.

[0021] The present invention also provides a control method for a heat pump system. Based on the above heat pump system, a water heat exchange flow path capable of heat exchanging with the refrigerant heat exchange flow path is further formed in the heat exchanger. A water tank is provided on the water heat exchange flow path. The heat pump system further includes an indoor blower corresponding to the indoor heat exchanger;

[0022] The control method of the heat pump system includes:

[0023] Obtain the temperature adjustment requirement indoors and the current water temperature of the water tank;

[0024] Obtain the set water temperature selected by the user, and determine a reference temperature according to the set water temperature and the preset shutdown temperature of the compressor;

[0025] Judge whether the current water temperature is less than the reference temperature to obtain a judgment result;

[0026] Based on the judgment result and the temperature adjustment requirement, determine the current working mode of the heat pump system, and control the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor blower respectively according to the current working mode.

[0027] Optionally, the working mode of the heat pump system includes a heat storage and refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0028] The determining the current working mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor blower respectively according to the current working mode includes:

[0029] Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system is a heat storage and refrigeration mode;

[0030] According to the heat storage and refrigeration mode, control the four-way valve to switch the suction port of the compressor to communicate with the outdoor heat exchanger, throttle the first throttling element, fully open the second throttling element, and throttle or fully open the third throttling element.

[0031] Optionally, the operating mode of the heat pump system includes a refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is greater than or equal to the reference temperature;

[0032] Based on the judgment result and the temperature adjustment requirement, determine the current operating mode of the heat pump system, and control the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan according to the current operating mode, including:

[0033] Based on the judgment result and the temperature adjustment requirement, determine that the current operating mode of the heat pump system is the refrigeration mode;

[0034] According to the refrigeration mode, control the four-way valve to switch the discharge port of the compressor to communicate with the outdoor heat exchanger, throttle the first throttling element, close the second throttling element, and fully open the third throttling element.

[0035] Optionally, the operating mode of the heat pump system includes a heat storage and heating mode. When the temperature adjustment requirement is a heating requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0036] Based on the judgment result and the temperature adjustment requirement, determine the current operating mode of the heat pump system, and control the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan according to the current operating mode, including:

[0037] Based on the judgment result and the temperature adjustment requirement, determine that the current operating mode of the heat pump system is the heat storage and heating mode;

[0038] According to the heat storage and heating mode, control the four-way valve to switch the suction port of the compressor to communicate with the outdoor heat exchanger, throttle or fully open the first throttling element, fully open the second throttling element, and throttle the third throttling element.

[0039] Optionally, the operating mode of the heat pump system includes a heat storage mode. When the temperature adjustment requirement is no requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0040] Determine the current operating mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and control the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current operating mode, including:

[0041] Determine that the current operating mode of the heat pump system is the heat storage mode based on the judgment result and the temperature adjustment requirement;

[0042] According to the heat storage mode, control the four-way valve to switch the suction port of the compressor to communicate with the outdoor heat exchanger, fully open the first throttling element, fully open the second throttling element, throttle the third throttling element, and turn off the indoor fan.

[0043] Optionally, the control method of the heat pump system further includes:

[0044] Obtain the current ambient temperature;

[0045] When the current ambient temperature satisfies the first preset temperature condition, obtain multiple defrosting temperatures of the outdoor heat exchanger at preset time intervals, and determine the temperature drop rate according to the multiple defrosting temperatures;

[0046] When the current defrosting temperature of the outdoor heat exchanger satisfies the first preset temperature condition and the current temperature drop rate satisfies the preset temperature change condition, determine that the operating mode of the heat pump system is the defrosting mode;

[0047] According to the defrosting mode, control the four-way valve to switch the exhaust port of the compressor to communicate with the outdoor heat exchanger, close the first throttling element, fully open the second throttling element, and throttle the third throttling element.

[0048] In the technical solution of the present invention, when the heat pump system does not need to heat domestic water, the heat pump system switches to the first circulation flow state. After the refrigerant passes through the outdoor heat exchanger, it flows through the heat exchanger and / or the indoor heat exchanger, and then returns to the compressor. By setting the combined check valve structure, the heat pump system can achieve various working modes such as refrigeration and defrosting in the first circulation flow state. When the heat pump system needs to heat domestic water, the heat pump system switches to the second circulation flow state. After the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor. By setting the check valve structure, the heat pump system can achieve various working modes such as heat storage refrigeration and heat storage heating in the second circulation flow state. Thus, by setting the combined check valve structure, the heat pump system can not only achieve various working modes in the first circulation flow state, but also achieve various working modes in the second circulation mode, so as to avoid the need to additionally install control structures such as solenoid valves to control the heat pump system in order to achieve various working modes in the first circulation flow state or the second circulation flow state, thereby solving the problem that the existing heat pump system needs multiple solenoid valves to achieve different mode switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0050] Figure 1 It is a schematic structural diagram of an embodiment of the heat pump system provided by the present invention;

[0051] Figure 2 is Figure 1 a schematic structural diagram of the heat pump system in the first circulation flow state in

[0052] Figure 3 is Figure 1 a schematic structural diagram of the heat pump system in the second circulation flow state in

[0053] Figure 4 is Figure 1 a schematic structural diagram of another embodiment of the heat pump system in

[0054] Figure 5 is Figure 1 a schematic structural diagram of the control device of the hardware operating environment involved in the embodiment solution in

[0055] Figure 6Schematic flow chart of the first embodiment of the control method for the heat pump system provided by the present invention.

[0056] Explanation of reference numerals in the drawings:

[0057] Label Name Label Name 100 Heat pump system 3 Combined check valve structure 1 Refrigerant circulation flow path 31 First check valve 11 Compressor 32 Second check valve 12 Four-way valve 33 Third check valve 13 Outdoor heat exchanger 41 First throttling element 14 Indoor heat exchanger 42 Second throttling element 15 Indoor fan 43 Third throttling element 16 Diversion flow path 5 Filter 2 Refrigerant heat exchange flow path 6 Refrigerant radiator 21 First flow path end 7 Water tank 22 Second flow path end 8 Heating rod 23 Heat exchanger

[0058] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0060] It should be noted that if there are directional indications in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0061] In addition, if there are descriptions such as "first" and "second" in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0062] Currently, the devices on the market that provide domestic hot water for households (gas, electricity, solar energy, and heat pump water heaters) and the devices that provide heating (gas wall-mounted boilers, electric boilers, heat pumps) are two sets of devices, and the initial investment, installation cost, and operating cost of the devices are relatively high. For this reason, related technologies propose a heat pump system for domestic hot water and heating. By paralleling a water tank or a heat storage module, the user's needs for domestic hot water and heating can be met simultaneously. However, since a water tank or a heat storage module is paralleled in the heat pump system, multiple solenoid valves need to be added to achieve the switching of different modes, resulting in an increase in control difficulty and a significant increase in system cost.

[0063] Based on this, the present invention provides a heat pump system, aiming at the problem that the existing heat pump system needs multiple solenoid valves to achieve the switching of different modes. Among them,Figures 1 to 4 The structural schematic diagram of the heat pump system provided by the present invention; Figure 5 The structural schematic diagram of the control device of the hardware operating environment involved in the embodiment solution of the present invention; Figure 6 The flowchart of the control method of the provided heat pump system.

[0064] Please refer to Figures 1 to 4 , a refrigerant flow path is formed on the heat pump system 100. The refrigerant flow path includes a refrigerant circulation flow path 1 and a refrigerant heat exchange flow path 2. A compressor 11, a four-way valve 12, an outdoor heat exchanger 13, and an indoor heat exchanger 14 are provided on the refrigerant circulation flow path 1. A heat exchanger 23 is provided on the refrigerant heat exchange flow path 2 section. A combined check valve structure 3 is provided on the refrigerant flow path. The four-way valve 12 can switch the outdoor heat exchanger 13 to communicate with the exhaust port or the suction port of the compressor 11. Correspondingly, the combined check valve structure 3 is used to enable the refrigerant to switch from the first circulation state to the second circulation state, so that the heat pump system 100 can switch between the first circulation state and the second circulation state. In the first circulation state, after the refrigerant passes through the outdoor heat exchanger 13, it flows through the heat exchanger 23 and / or the indoor heat exchanger 14 and returns to the compressor 11. In the second circulation state, after the refrigerant passes through the heat exchanger 23, it sequentially passes through the indoor heat exchanger 14 and the outdoor heat exchanger 13 and then returns to the compressor 11.

[0065] In the technical solution of the present invention, when the heat pump system 100 does not need to heat domestic water, the heat pump system 100 switches to the first circulation flow state. After the refrigerant passes through the outdoor heat exchanger 13, it flows through the heat exchanger 23 and / or the indoor heat exchanger 14, and then returns to the compressor 11. By setting the combined check valve structure 3, the heat pump system 100 can achieve various working modes such as refrigeration and defrosting in the first circulation flow state. When the heat pump system 100 needs to heat domestic water, the heat pump system 100 switches to the second circulation flow state. After the refrigerant passes through the heat exchanger 23, it sequentially passes through the indoor heat exchanger 14 and the outdoor heat exchanger 13 and then returns to the compressor 11. By setting the check valve structure, the heat pump system 100 can achieve various working modes such as heat storage refrigeration and heat storage heating in the second circulation flow state. In this way, by setting the combined check valve structure 3, the heat pump system 100 can not only achieve various working modes in the first circulation flow state, but also achieve various working modes in the second circulation mode, so as to avoid the need to additionally install control structures such as solenoid valves to control the heat pump system 100 in order to achieve various working modes in the first circulation flow state or the second circulation flow state, thus solving the problem that the existing heat pump system 100 needs multiple solenoid valves to achieve different mode switches.

[0066] It should be noted that since the existing heat pump system 100 needs to have both air-conditioning function and domestic water function at the same time, where the air-conditioning function includes heating mode, refrigeration mode, defrosting mode, etc., and the domestic water function includes heat storage refrigeration mode, heat storage heating mode, heat storage mode, etc., the heat pump system 100 needs to add multiple solenoid valves to achieve the switch between multiple modes under different functions, resulting in an increase in system control difficulty and system cost. In the present application, by setting the combined check valve structure 3, the heat pump system 100 can not only work in the first circulation flow state to enable the heat pump system 100 to achieve various working modes under the air-conditioning function, but also work in the second circulation mode to enable the heat pump system 100 to achieve various working modes under the domestic water heating function, avoiding the additional installation of solenoid valves for control, so as to reduce the control difficulty of the heat pump system 100, thereby facilitating the reduction of system cost.

[0067] It should be understood that the air-conditioning system 100 further includes a control device. Please refer to Figure 5, the control device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0068] Further, the refrigerant heat exchange flow path 2 has a first flow path end 21 and a second flow path end 22. The first flow path end 21 is connected to the refrigerant circulation flow path 1 and is located between the four-way valve 12 and the indoor heat exchanger 14. The second flow path end 22 is connected to the refrigerant circulation flow path 1 and is located between the indoor heat exchanger 14 and the outdoor heat exchanger 13. The combined check valve structure 3 includes a first check valve 31, a second check valve 32, and a third check valve 33. The first check valve 31 is provided on the refrigerant circulation flow path 1 and is located between the first flow path end 21 and the indoor heat exchanger 14 for unidirectionally guiding the refrigerant flowing out of the indoor heat exchanger 14. The second check valve 32 is provided on the refrigerant flow path and is located between the second flow path end 22 and the outdoor heat exchanger 13 for unidirectionally guiding the refrigerant flowing from the outdoor heat exchanger 13. The refrigerant flow path further includes a diversion flow path 16. One end of the diversion flow path 16 is connected between the first check valve 31 and the indoor heat exchanger 14, and the other end of the diversion flow path 16 is connected between the second check valve 32 and the outdoor heat exchanger 13. The third check valve 33 is provided on the diversion flow path 16 for unidirectionally guiding the refrigerant flowing out of the indoor heat exchanger 14. When the four-way valve 12 switches the exhaust port of the compressor 11 to be in communication with the indoor heat exchanger 14, the refrigerant flows into the indoor heat exchanger 14 through the second check valve 32, and after heat exchange in the indoor heat exchanger 14, it flows back to the compressor 11 through the first check valve 31. Among them, although the diversion flow path 16 can connect the inlet and outlet of the indoor heat exchanger 14, due to the outlet pressure of the third check valve 33 being greater than the inlet pressure, the refrigerant cannot flow back to the inlet of the indoor heat exchanger 14 through the diversion flow path 16, so that the third check valve 33 can close the diversion flow path 16, enabling the refrigerant flowing out of the indoor heat exchanger 14 to only flow into the compressor 11 through the first check valve 31, so that the heat pump system 100 can achieve the first circulation flow state. When the four-way valve 12 switches the exhaust port of the compressor 11 to be in communication with the heat exchanger 23, the refrigerant passes through the indoor heat exchanger 14 and the third check valve 33 and then returns to the compressor 11 through the outdoor heat exchanger 13. Among them, although the outlet pipeline of the indoor heat exchanger 14 is in communication with the inlet pipeline of the heat exchanger 23, due to the outlet pressure of the first check valve 31 being greater than the inlet pressure, the refrigerant cannot flow back to the heat exchanger 23 through the first check valve 31 to close the outlet pipeline of the indoor heat exchanger 14 and the inlet pipeline of the heat exchanger 23, so that the refrigerant can only flow into the outdoor heat exchanger 13 unidirectionally through the third check valve 33, enabling the heat pump system 100 to achieve the second circulation flow state. Thus, by setting the first check valve 31, the second check valve 32, and the third check valve 33,So that the heat pump system 100 can achieve multiple working modes both in the first circulation flow state and the second circulation flow state.

[0069] In some embodiments of the present invention, a first throttling element 41 is provided on the refrigerant circulation flow path 1, and the first throttling element 41 is located between the second flow path end 22 and the indoor heat exchanger 14. Thus, by setting the first throttling element 41, the refrigerant flowing into or out of the indoor heat exchanger 14 can be controlled, so that the refrigerant can exchange heat through the indoor heat exchanger 14. It can be understood that the first throttling element 41 can be an electronic expansion valve or a thermal expansion valve, etc., and the present invention does not limit this. Specifically, in this embodiment, the first throttling element 41 is an electronic expansion valve.

[0070] In some embodiments of the present invention, a second throttling element 42 is provided on the refrigerant heat exchange flow path 2, and the second throttling element 42 is located between the heat exchanger 23 and the second flow path end 22. Thus, by setting the second throttling element 42, the refrigerant flowing into or out of the indoor heat exchanger 14 can be controlled, so that the refrigerant can exchange heat through the heat exchanger 23. It can be understood that the second throttling element 42 can be an electronic expansion valve or a thermal expansion valve, etc., and the present invention does not limit this. Specifically, in this embodiment, the second throttling element 42 is an electronic expansion valve.

[0071] In some embodiments of the present invention, a third throttling element 43 is provided on the refrigerant circulation flow path 1, and the third throttling element 43 is located between the second check valve 32 and the outdoor heat exchanger 13. Thus, by setting the third throttling element 43, the refrigerant flowing into or out of the indoor heat exchanger 14 can be controlled, so that the refrigerant can exchange heat through the heat exchanger 23. It can be understood that the third throttling element 43 can be an electronic expansion valve or a thermal expansion valve, etc., and the present invention does not limit this. Specifically, in this embodiment, the third throttling element 43 is an electronic expansion valve.

[0072] It should be noted that the above three related technical features: "a first throttling element 41 is provided on the refrigerant circulation flow path 1", "a second throttling element 42 is provided on the refrigerant heat exchange flow path 2", "a third throttling element 43 is provided on the refrigerant circulation flow path 1" can be set selectively, set two of them, or set them simultaneously. Obviously, the effect of setting them simultaneously is better.

[0073] In some embodiments of the present invention, please refer to Figure 2, when the refrigerant is in the first circulation flow state, the first throttling element 41 throttles, the second throttling element 42 closes, and the third throttling element 43 is fully open. After the refrigerant passes through the outdoor heat exchanger 13, it flows through the indoor heat exchanger 14 and returns to the compressor 11, so that the heat pump system 100 has a refrigeration mode. When the heat pump system 100 only needs refrigeration, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the indoor and outdoor heat exchangers. After the refrigerant is condensed by the outdoor heat exchanger 13, it flows into the first throttling element 41 through the third throttling element 43, is throttled by the first throttling element 41 and then flows into the indoor heat exchanger 14, and after evaporating in the indoor heat exchanger 14, it returns to the compressor 11. Thus, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 forms a refrigeration cycle, so that the heat pump system 100 realizes an independent refrigeration mode.

[0074] In some embodiments of the present invention, when the refrigerant is in the first circulation flow state, the first throttling element 41 closes, the second throttling element 42 is fully open, and the third throttling element 43 throttles. After the refrigerant passes through the outdoor heat exchanger 13, it flows through the heat exchanger 23 and returns to the compressor 11, so that the heat pump system 100 has a defrosting mode. When the heat pump system 100 needs to defrost, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13. After the refrigerant is cooled by the outdoor heat exchanger 13, it flows into the second throttling element 42 through the third throttling element 43, and after passing through the second throttling element 42, it flows into the heat exchanger 23 and returns to the compressor 11 after evaporating in the heat exchanger 23, so that the heat pump system 100 forms a defrosting cycle. Thus, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the outdoor heat exchanger 13 can extract heat from the water tank 7 through the heat exchanger 23. Compared with defrosting by the compressor 11, the defrosting time is longer and the defrosting effect is better.

[0075] It should be noted that the above two related technical features: "the first throttling element 41 throttles, the second throttling element 42 closes, and the third throttling element 43 is fully open, so that the heat pump system 100 has a refrigeration mode" and "the first throttling element 41 closes, the second throttling element 42 is fully open, and the third throttling element 43 throttles, so that the heat pump system 100 has a defrosting mode" can be set alternatively or simultaneously, and the present invention does not limit this.

[0076] In some embodiments of the present invention, please refer to Figure 3, the heat pump system 100 further includes an indoor fan 15 corresponding to the indoor heat exchanger 14, and the indoor fan 15 is turned on. When the refrigerant is in the second circulation flow state, the first throttling element 41 throttles, the second throttling element 42 is fully open, the third throttling element 43 throttles or is fully open, and the indoor fan 15 is turned on. After the refrigerant passes through the heat exchanger 23, it sequentially passes through the indoor heat exchanger 14 and the outdoor heat exchanger 13 and then returns to the compressor 11, so that the heat pump system 100 has a heat storage refrigeration mode. When the heat pump system 100 needs to refrigerate and heat the water tank 7, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23. After the refrigerant is cooled by the heat exchanger 23, it flows into the first throttling element 41 through the second throttling element 42, and after being throttled by the first throttling element 41, it flows into the indoor heat exchanger 14. After evaporative heat exchange in the indoor heat exchanger 14, it sequentially passes through the third throttling element 43 and the outdoor heat exchanger 13 and then returns to the compressor 11, so that the heat pump system 100 forms a heat storage refrigeration cycle. Thus, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 can both refrigerate the indoor space and heat the water tank 7, so that the heat pump system 100 realizes the heat storage refrigeration mode. It should be noted that since the outdoor heat exchanger 13 may or may not work in the heat storage refrigeration mode of the heat pump system 100, the third throttling element 43 can throttle or be fully open, as long as the refrigerant can return to the compressor 11. The present invention does not make any limitations in this regard. Further, the third throttling element 43 throttles to improve the refrigeration effect of the heat pump system 100.

[0077] In some embodiments of the present invention, the heat pump system 100 further includes an indoor fan 15 corresponding to the indoor heat exchanger 14. When the refrigerant is in the second circulation flow state, the first throttling element 41 is fully open, the second throttling element 42 is fully open, the third throttling element 43 throttles, and the indoor fan 15 is turned off. After the refrigerant passes through the heat exchanger 23, it sequentially passes through the indoor heat exchanger 14 and the outdoor heat exchanger 13 and then returns to the compressor 11, so that the heat pump system 100 has a heat storage mode. When the heat pump system 100 only needs to heat the water tank 7, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23. After the refrigerant condenses through the heat exchanger 23, it sequentially passes through the second throttling element 42, the first throttling element 41, and the indoor heat exchanger 14 and then flows into the third throttling element 43. After being throttled by the third throttling element 43, it flows into the outdoor heat exchanger 13 and evaporates in the outdoor heat exchanger 13 and then returns to the compressor 11. Thus, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 forms a heat storage cycle to heat the water tank 7, so that the heat pump system 100 realizes the heat storage mode.

[0078] In some embodiments of the present invention, the heat pump system 100 further includes an indoor fan 15 corresponding to the indoor heat exchanger 14. When the refrigerant is in the second circulation flow state, the first throttling element 41 throttles or is fully open, the second throttling element 42 is fully open, the third throttling element 43 throttles, and the indoor fan 15 is turned on. After the refrigerant passes through the heat exchanger 23, it sequentially passes through the indoor heat exchanger 14 and the outdoor heat exchanger 13 and then returns to the compressor 11, so that the heat pump system 100 has a heat storage and heating mode. When the heat pump system 100 needs to heat and heat the water tank 7, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23. After the refrigerant is condensed once through the heat exchanger 23, it flows into the first throttling element 41 through the second throttling element 42 and then flows into the indoor heat exchanger 14 after passing through the first throttling element 41. After being condensed twice in the indoor heat exchanger 14, it flows into the third throttling element 43 and then flows into the outdoor heat exchanger 13 after being throttled by the third throttling element 43. After evaporating in the outdoor heat exchanger 13, it returns to the compressor 11, so that the heat pump system 100 forms a heat storage and heating cycle. Thus, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 can both heat the indoor space and heat the water tank 7, so that the heat pump system 100 realizes the heat storage and heating mode.

[0079] It can be understood that when the heat pump system 100 is in the heat storage and heating mode, the first throttling element 41 can throttle or be fully open. The present invention does not limit this. Specifically, in the heat storage and heating mode, the indoor heat exchanger 14 is mainly used for heat release. At this time, all the refrigerant flowing out of the heat exchanger 23 can flow into the indoor heat exchanger 14, or part of it can flow into the indoor heat exchanger, that is, the first throttling element 41 can throttle or be fully open. However, in order to reduce the amount of refrigerant flowing into the indoor heat exchanger 14, the first throttling element 41 needs to throttle to control the amount of refrigerant flowing into the indoor heat exchanger 14, thereby reducing the temperature of the indoor heat exchanger 14.

[0080] It should be noted that for the above three related technical features: "the first throttling element 41 throttles, the second throttling element 42 is fully open, the third throttling element 43 throttles or is fully open, and the indoor fan 15 is turned on so that the heat pump system 100 has a heat storage and refrigeration mode", "the first throttling element 41 is fully open, the second throttling element 42 is fully open, the third throttling element 43 throttles, and the indoor fan 15 is turned off so that the heat pump system 100 has a heat storage mode", "the first throttling element 41 throttles or is fully open, the second throttling element 42 is fully open, the third throttling element 43 throttles, and the indoor fan 15 is turned on so that the heat pump system 100 has a heat storage and heating mode", they can be set selectively, set in pairs, or set simultaneously. The present invention does not limit this.

[0081] In some embodiments of the present invention, a filter 5 is provided on the refrigerant circulation flow path 1. In this way, by providing the filter 5, impurities on the refrigerant circulation flow path 1 can be filtered out to avoid affecting the throttling of the throttling element. Further, a plurality of filters 5 are provided, and the plurality of filters 5 are respectively provided corresponding to the first throttling element 41 and the third throttling element 43.

[0082] In some embodiments of the present invention, a filter 5 is provided on the refrigerant heat exchange flow path 2. In this way, by providing the filter 5, impurities on the refrigerant heat exchange flow path 2 can be filtered out to avoid affecting the throttling of the throttling element.

[0083] It should be noted that for the above two related technical features: "a filter 5 is provided on the refrigerant circulation flow path 1" and "a filter 5 is provided on the refrigerant heat exchange flow path 2", they can be set selectively or set simultaneously. The present invention does not limit this.

[0084] In some embodiments of the present invention, the heat exchanger 23 includes a microchannel heat exchanger. Since the microchannel heat exchanger has a large specific surface area and a high transfer rate, it can prevent local heat accumulation, which is beneficial to accurately controlling the temperature of the water tank 7. Of course, in other embodiments, the heat exchanger 23 may also be a plate heat exchanger or the like, and the present invention does not limit this.

[0085] In some embodiments of the present invention, the heat pump system 100 further includes a refrigerant radiator 6 provided on the refrigerant circulation flow path 1. The refrigerant radiator 6 is located between the indoor heat exchanger 14 and the outdoor heat exchanger 13. Thus, by providing the refrigerant radiator 6, the circuit board assembly of the heat pump system 100 can be cooled.

[0086] In some embodiments of the present invention, a water heat exchange flow path capable of exchanging heat with the refrigerant heat exchange flow path 2 is further formed in the heat exchanger 23. A water tank 7 is provided on the water heat exchange flow path. The water tank 7 is connected to a water supply component and a water using component. Thus, by providing the water tank 7, heat can be exchanged with the heat exchanger 23 to heat the water tank 7. By providing the water supply component, water can be supplied to the water tank 7, and by providing the water using component, users can use water.

[0087] In some embodiments of the present invention, the heat pump system 100 further includes a heating rod 8 for heating the water in the water tank 7. Since the heating of the water tank 7 by the compressor has a limit and may not reach the water temperature set by the user, the heating rod 8 is provided to assist in heating the water tank 7 so that the temperature of the water tank 7 can reach the set temperature of the user.

[0088] Those skilled in the art can understand that Figure 5 the structures shown in do not constitute a limitation on the control device, and may include more or fewer components than shown, or combine some components, or have different component arrangements.

[0089] Such as Figure 5 shown, in a memory 1005 as a storage medium, an operating system, a network communication module, a user interface module, and a control program for the heat pump system 100 may be included.

[0090] In Figure 5 the control device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with users; the processor 1001 and the memory 1005 in the control device of the present invention may be provided in the control device. The control device calls the control program of the heat pump system 100 stored in the memory 1005 through the processor 1001 and executes the control method of the heat pump system 100 provided by the embodiments of the present invention.

[0091] In Figure 5 the control device shown, the control program of the heat pump system 100 stored in the memory 1005 is called by the processor 1001.

[0092] In the heat exchanger 23, a water heat exchange flow path capable of exchanging heat with the refrigerant heat exchange flow path 2 is further formed. A water tank 7 is provided on the water heat exchange flow path. The heat pump system 100 further includes an indoor fan 15 provided corresponding to the indoor heat exchanger 14;

[0093] The control method of the heat pump system 100 includes:

[0094] Obtain the temperature adjustment requirement indoors and the current water temperature of the water tank 7;

[0095] Obtain the set water temperature selected by the user, and determine the reference temperature according to the set water temperature and the preset shutdown temperature of the compressor 11;

[0096] Judge whether the current water temperature is less than the reference temperature to obtain a judgment result;

[0097] Based on the judgment result and the temperature adjustment requirement, determine the current working mode of the heat pump system 100, and control the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current working mode.

[0098] Further, the working mode of the heat pump system 100 includes a heat storage refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0099] The determining the current working mode of the heat pump system 100 based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current working mode includes:

[0100] Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system 100 is the heat storage refrigeration mode;

[0101] According to the heat storage refrigeration mode, control the four-way valve 12 to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13, throttle the first throttling element 41, fully open the second throttling element 42, and throttle or fully open the third throttling element 43.

[0102] Further, the operating modes of the heat pump system 100 include a refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is greater than or equal to the reference temperature;

[0103] Determining the current operating mode of the heat pump system 100 based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current operating mode, including:

[0104] Determining that the current operating mode of the heat pump system 100 is the refrigeration mode based on the judgment result and the temperature adjustment requirement;

[0105] Controlling the four-way valve 12 according to the refrigeration mode to switch the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13, throttling the first throttling element 41, closing the second throttling element 42, and fully opening the third throttling element 43.

[0106] Further, the operating modes of the heat pump system 100 include a heat storage heating mode. When the temperature adjustment requirement is a heating requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0107] Determining the current operating mode of the heat pump system 100 based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current operating mode, including:

[0108] Determining that the current operating mode of the heat pump system 100 is the heat storage heating mode based on the judgment result and the temperature adjustment requirement;

[0109] Controlling the four-way valve 12 according to the heat storage heating mode to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13, throttling or fully opening the first throttling element 41, fully opening the second throttling element 42, and throttling the third throttling element 43.

[0110] Further, the operating modes of the heat pump system 100 include a heat storage mode. When the temperature adjustment requirement is no requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0111] Determining the current operating mode of the heat pump system 100 based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current operating mode, including:

[0112] Based on the judgment result and the temperature regulation requirement, it is determined that the current working mode of the heat pump system 100 is the heat storage mode;

[0113] According to the heat storage mode, control the four-way valve 12 to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13, fully open the first throttling element 41, fully open the second throttling element 42, throttle the third throttling element 43, and turn off the indoor fan 15.

[0114] Furthermore, the control method of the heat pump system 100 further includes:

[0115] Obtain the current ambient temperature;

[0116] When the current ambient temperature meets the first preset temperature condition, obtain multiple defrosting temperatures of the outdoor heat exchanger 13 at preset time intervals, and determine the temperature drop rate according to the multiple defrosting temperatures;

[0117] When the current defrosting temperature of the outdoor heat exchanger 13 meets the first preset temperature condition and the current temperature drop rate meets the preset temperature change condition, determine that the working mode of the heat pump system 100 is the defrosting mode;

[0118] According to the defrosting mode, control the four-way valve 12 to switch the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13, close the first throttling element 41, fully open the second throttling element 42, and throttle the third throttling element 43.

[0119] Based on the above hardware structure, the present invention proposes a control method for a heat pump system 100. The control method of the air conditioner enables the heat pump system 100 to achieve multiple working modes both in the first circulation flow state and in the second circulation mode through the combined check valve structure 3, so as to avoid the need to additionally add control structures such as solenoid valves to control the heat pump system 100 in order to achieve multiple working modes in the first circulation flow state or the second circulation flow state.

[0120] Please refer to Figure 6 , Figure 6 , which is a schematic flow chart of the first embodiment of the control method for the heat pump system 100 provided by the present invention.

[0121] A water heat exchange flow path capable of exchanging heat with the refrigerant heat exchange flow path 2 is further formed in the heat exchanger 23. A water tank 7 is provided on the water heat exchange flow path. The heat pump system 100 further includes an indoor fan 15 corresponding to the indoor heat exchanger 14;

[0122] The control method of the heat pump system 100 includes:

[0123] S10: Obtain the temperature adjustment requirement in the room and the current water temperature of the water tank 7;

[0124] It should be noted that there are various ways to obtain the temperature adjustment requirement in the room. It can be obtained through the on-off key or through the remote control, etc. The present invention does not limit this. The temperature adjustment requirement includes heating requirement, refrigeration requirement, defrosting requirement, etc. There are various devices for obtaining the current water temperature of the water tank 7. It can be a contact temperature sensor or a non-contact temperature sensor, etc. The present invention does not limit this.

[0125] S20: Obtain the set water temperature selected by the user, and determine the reference temperature according to the set water temperature and the preset shutdown temperature of the compressor 11;

[0126] It should be noted that the preset shutdown temperature refers to the highest temperature at which the compressor 11 heats the water tank 7. Since the heating of the water tank 7 by the compressor 11 has a limit, if the set water temperature is greater than the maximum heating temperature of the compressor 11, no matter how the compressor 11 works, the temperature of the water tank 7 cannot reach the set temperature. Therefore, if the set water temperature is Td, the preset shutdown temperature is Tend, the reference temperature is Tc, and the temperature difference between the reference temperature and the set water temperature or the preset shutdown temperature is ΔT, where 2°C ≤ ΔT ≤ 10°C. When the set water temperature is greater than the preset shutdown temperature, it means that the set water temperature exceeds the highest temperature at which the compressor 11 heats the water tank 7. At this time, the reference temperature is based on the preset shutdown temperature, Tc = Tend - ΔT. When the set water temperature is less than or equal to the preset shutdown temperature, it means that the set water temperature does not exceed the highest temperature at which the compressor 11 heats the water tank 7. At this time, the reference temperature is based on the set water temperature, Tc = Td - ΔT.

[0127] S30: Judge whether the current water temperature is less than the reference temperature to obtain a judgment result;

[0128] It should be noted that when the current water temperature is less than the reference water temperature, it means that the water temperature of the water tank 7 does not meet the temperature requirement of domestic water, and the water tank 7 needs to be heated. When the current water temperature is greater than or equal to the reference water temperature, it means that the water temperature of the water tank 7 meets the temperature requirement of domestic water, and the water tank 7 does not need to be heated.

[0129] S40: Determine the current working mode of the heat pump system 100 based on the judgment result and the temperature adjustment requirement, and control the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 respectively according to the current working mode.

[0130] In this embodiment, according to the temperature adjustment requirement in the room and the judgment structure, the current working mode of the heat pump system 100 is determined, and the four-way valve 12, the first throttling element 41, the second throttling element 42, the third throttling element 43, and the indoor fan 15 are controlled to act according to the current working mode, so that the heat pump system 100 can not only achieve multiple working modes in the first circulation flow state, but also achieve multiple working modes in the second circulation mode, so as to avoid the need to additionally add control structures such as solenoid valves to control the heat pump system 100 to achieve multiple working modes in the first circulation flow state or the second circulation flow state, thereby solving the problem that the existing heat pump system 100 needs to use multiple solenoid valves to achieve different mode switching.

[0131] Further, the working mode of the heat pump system 100 includes a heat storage and refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0132] Step S40 includes:

[0133] S411: Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system 100 is the heat storage and refrigeration mode;

[0134] S412: According to the heat storage and refrigeration mode, control the four-way valve 12 to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13, throttle the first throttling element 41, fully open the second throttling element 42, and throttle or fully open the third throttling element 43.

[0135] In this embodiment, when the temperature adjustment requirement is a cooling requirement, it is further necessary to determine whether the water tank 7 needs to be heated. When the current water temperature is lower than the reference temperature, it indicates that the water temperature in the water tank 7 does not meet the temperature requirement for domestic water, and it is determined that the water tank 7 needs to be heated. Therefore, the current working mode is determined to be the heat storage and cooling mode. At this time, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23, and the suction port of the compressor 11 communicates with the outdoor heat exchanger 13. After the refrigerant is cooled by the heat exchanger 23, it flows into the first throttling element 41 through the second throttling element 42, and after being throttled by the first throttling element 41, it flows into the indoor heat exchanger 14. After evaporative heat exchange in the indoor heat exchanger 14, it successively passes through the third throttling element 43 and the outdoor heat exchanger 13, and then returns to the compressor 11, so that the heat pump system 100 forms a heat storage and cooling cycle. In this way, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 can both cool the indoor environment and heat the water tank 7, thereby enabling the heat pump system 100 to achieve the heat storage and cooling mode.

[0136] It should be noted that when the heat pump system 100 is in the heat storage and cooling mode, the first one-way valve 31 is used to close the pipeline between the indoor heat exchanger 14 and the compressor 11, so that the refrigerant can only flow through the third one-way valve 33 to the third throttling element 43, and after passing through the third throttling element 43 and the outdoor heat exchanger 13, it returns to the compressor 11. Further, the third throttling element 43 can throttle or be fully open, and the present invention does not limit this.

[0137] In some embodiments of the present invention, the working mode of the heat pump system 100 includes a cooling mode. When the temperature adjustment requirement is a cooling requirement and the judgment result is that the current water temperature is greater than or equal to the reference temperature;

[0138] Step S40 includes:

[0139] S421: Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system 100 is the cooling mode;

[0140] S422: According to the cooling mode, control the four-way valve 12 to switch the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13, throttle the first throttling element 41, close the second throttling element 42, and fully open the third throttling element 43.

[0141] In this embodiment, when the temperature adjustment requirement is a cooling requirement, it is further necessary to determine whether the water tank 7 needs to be heated. When the current water temperature is greater than or equal to the reference temperature, it means that the water temperature in the water tank 7 meets the temperature requirement of domestic water, and it is determined that the water tank 7 does not need to be heated. Therefore, the current working mode is determined to be the cooling mode. At this time, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the indoor and outdoor heat exchangers, and the suction port of the compressor 11 is communicated with the indoor heat exchanger 14. After the refrigerant is condensed by the outdoor heat exchanger 13, it flows into the first throttling element 41 through the third throttling element 43, is throttled by the first throttling element 41 and then flows into the indoor heat exchanger 14, and after evaporating in the indoor heat exchanger 14, it returns to the compressor 11. In this way, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 forms a refrigeration cycle, so that the heat pump system 100 realizes an independent cooling mode.

[0142] It should be noted that when the heat pump system 100 is in the cooling mode, since the outlet pressure of the third one-way valve 33 is greater than the inlet pressure, the refrigerant cannot flow back to the inlet of the indoor heat exchanger 14 through the diversion flow path 16, so that the third one-way valve 33 can close the diversion flow path 16, so that the refrigerant flowing out of the indoor heat exchanger 14 can only flow back to the compressor 11 through the first one-way valve 31.

[0143] In some embodiments of the present invention, the working mode of the heat pump system 100 includes a heat storage heating mode. When the temperature adjustment requirement is a heating requirement and the judgment result is that the current water temperature is less than the reference temperature;

[0144] Step S40 includes:

[0145] S431: Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system 100 is the heat storage heating mode;

[0146] S432: According to the heat storage heating mode, control the four-way valve 12 to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13, the first throttling element 41 is throttled or fully open, the second throttling element 42 is fully open, and the third throttling element 43 is throttled.

[0147] In this embodiment, when the temperature adjustment requirement is a heating requirement, it is further necessary to determine whether the water tank 7 needs to be heated. When the current water temperature is lower than the reference temperature, it indicates that the water temperature in the water tank 7 does not meet the temperature requirement for domestic water, and it is determined that the water tank 7 needs to be heated. Therefore, the current working mode is determined to be the heat storage heating mode. At this time, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23, and the suction port of the compressor 11 communicates with the outdoor heat exchanger 13. After the refrigerant is condensed once by the heat exchanger 23, it flows into the first throttling element 41 through the second throttling element 42, and after passing through the first throttling element 41, it flows into the indoor heat exchanger 14, and after being condensed twice in the indoor heat exchanger 14, it flows into the third throttling element 43. After being throttled by the third throttling element 43, it flows into the outdoor heat exchanger 13, and after evaporating in the outdoor heat exchanger 13, it returns to the compressor 11, so that the heat pump system 100 forms a heat storage heating cycle. In this way, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 can not only heat the indoor environment but also heat the water tank 7, thereby enabling the heat pump system 100 to achieve the heat storage heating mode.

[0148] It should be noted that when the heat pump system 100 is in the heat storage heating mode, the first one-way valve 31 is used to close the pipeline between the indoor heat exchanger 14 and the compressor 11, so that the refrigerant can only flow through the third one-way valve 33 to the third throttling element 43, and after being throttled by the third throttling element 43, it flows into the outdoor heat exchanger 13, and after evaporative heat exchange in the outdoor heat exchanger 13, it returns to the compressor 11. Further, when the heat pump system 100 is in the heat storage heating mode, the first throttling element 41 can throttle or be fully open, and specifically can be adjusted according to needs. The present invention does not limit this.

[0149] In some embodiments of the present invention, the working mode of the heat pump system 100 includes a heat storage mode. When the temperature adjustment requirement is no requirement, and the judgment result is that the current water temperature is lower than the reference temperature;

[0150] Step S40 includes:

[0151] S441: Based on the judgment result and the temperature adjustment requirement, determine that the current working mode of the heat pump system 100 is the heat storage mode;

[0152] S442: Control the four-way valve 12 to switch the suction port of the compressor 11 to communicate with the outdoor heat exchanger 13 according to the heat storage mode, fully open the first throttling element 41, fully open the second throttling element 42, throttle the third throttling element 43, and turn off the indoor fan 15.

[0153] In this embodiment, when there is no temperature adjustment requirement, it means that the room neither needs cooling nor heating. At this time, it is necessary to further determine whether the water tank 7 needs to be heated. When the current water temperature is lower than the reference temperature, it means that the water temperature of the water tank 7 does not meet the temperature requirement of domestic water, and it is determined that the water tank 7 needs to be heated. Therefore, it is determined that the current working mode is the heat storage mode. At this time, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the heat exchanger 23, the suction port of the compressor 11 communicates with the outdoor heat exchanger 13. After the refrigerant is condensed by the heat exchanger 23, it flows through the second throttling element 42, the first throttling element 41, and the indoor heat exchanger 14 in sequence, then flows into the third throttling element 43, and after being throttled by the third throttling element 43, it flows into the outdoor heat exchanger 13. After evaporating in the outdoor heat exchanger 13, it returns to the compressor 11. In this way, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42, and the third throttling element 43, the heat pump system 100 forms a heat storage cycle to heat the water tank 7, so that the heat pump system 100 realizes the heat storage mode.

[0154] In some embodiments of the present invention, the control method of the heat pump system 100 further includes:

[0155] S51: Obtain the current ambient temperature;

[0156] S52: When the current ambient temperature meets the first preset temperature condition, obtain multiple defrosting temperatures of the outdoor heat exchanger 13 at preset time intervals, and determine the temperature drop rate according to the multiple defrosting temperatures;

[0157] It should be noted that the first preset temperature condition can be a fixed value or a value range, etc., and the present invention does not limit this. The preset duration can be ten minutes, one hour, etc., and can be specifically set according to needs, and the present invention does not limit this. In a specific reality, taking the first preset condition as 14°C and the preset duration as 10 min as an example, if the current ambient temperature is greater than 14°C, it indicates that the outdoor heat exchanger 13 will not frost. At this time, it is not necessary to obtain the defrosting temperature of the outdoor heat exchanger 13. If the current ambient temperature is less than or equal to 14°C, it indicates that the outdoor heat exchanger 13 may frost. At this time, it is necessary to obtain the defrosting temperature of the outdoor heat exchanger 13 every 10 min to further determine whether the outdoor heat exchanger 13 has frosted.

[0158] S53: When the current defrosting temperature of the outdoor heat exchanger 13 meets the second preset temperature condition and the current temperature drop rate meets the preset temperature change condition, determine that the operating mode of the heat pump system 100 is the defrosting mode;

[0159] It should be noted that the second preset temperature condition and the preset temperature change condition can be a fixed value or a value range, etc., and the present invention does not limit this. In a specific reality, taking the second preset condition as 0°C and the preset temperature change condition as 1°C / min as an example, when the current defrosting temperature is less than 0°C and the current temperature drop rate is greater than 1°C / min, it indicates that the outdoor heat exchanger 13 has frosted. At this time, determine that the operating mode of the heat pump system 100 is the defrosting mode.

[0160] S54: Control the four-way valve 12 according to the defrosting mode to switch the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13, close the first throttling element 41, fully open the second throttling element 42, and throttle the third throttling element 43.

[0161] In this embodiment, according to the current ambient temperature, in order to timely track the frosting condition of the outdoor heat exchanger 13. When the current environment meets the first preset temperature condition, it indicates that the outdoor heat exchanger 13 may be frosted. At this time, it is necessary to pay attention to the frosting condition of the outdoor heat exchanger 13. When the current defrosting temperature of the outdoor heat exchanger 13 meets the second preset temperature condition and the current temperature decrease rate meets the preset temperature change condition, it indicates that the outdoor heat exchanger 13 has been frosted and defrosting of the outdoor heat exchanger 13 is required. The working mode of the heat pump system 100 is determined to be the defrosting mode. At this time, the four-way valve 12 switches the exhaust port of the compressor 11 to communicate with the outdoor heat exchanger 13, and the suction port of the compressor 11 is communicated with the heat exchanger 23. After the refrigerant is cooled by the outdoor heat exchanger 13, it flows into the second throttling element 42 through the third throttling element 43, and after passing through the second throttling element 42, it flows into the heat exchanger 23, evaporates in the heat exchanger 23 and then returns to the compressor 11, so that the heat pump system 100 forms a defrosting cycle. In this way, by controlling the actions of the four-way valve 12, the first throttling element 41, the second throttling element 42 and the third throttling element 43, the outdoor heat exchanger 13 can extract heat from the water tank 7 through the heat exchanger 23. Compared with defrosting by the compressor 11, the defrosting time is longer and the defrosting effect is better.

[0162] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A heat pump system, characterized in that, A refrigerant flow path is formed on the heat pump system. The refrigerant flow path includes a refrigerant circulation flow path and a refrigerant heat exchange flow path. A compressor, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are provided on the refrigerant circulation flow path. A heat exchanger is provided on the refrigerant heat exchange flow path section. A combined check valve structure is provided on the refrigerant flow path. The four-way valve can switch the outdoor heat exchanger to communicate with the exhaust port or the suction port of the compressor. Correspondingly, the combined check valve structure is used to switch the refrigerant from the first circulation flow state to the second circulation flow state, so that the heat pump system can switch between the first circulation flow state and the second circulation flow state. In the first circulation flow state, after the refrigerant passes through the outdoor heat exchanger, it flows through the heat exchanger and / or the indoor heat exchanger and returns to the compressor. In the second circulation flow state, after the refrigerant passes through the heat exchanger, it sequentially passes through the indoor heat exchanger and the outdoor heat exchanger and then returns to the compressor.

2. The heat pump system according to claim 1, wherein The refrigerant heat exchange flow path has a first flow path end and a second flow path end. The first flow path end is connected to the refrigerant circulation flow path and is located between the four-way valve and the indoor heat exchanger. The second flow path end is connected to the refrigerant circulation flow path and is located between the indoor heat exchanger and the outdoor heat exchanger. The combined check valve structure includes a first check valve, a second check valve, and a third check valve. The first check valve is provided on the refrigerant circulation flow path and is located between the first flow path end and the indoor heat exchanger, and is used to unidirectionally guide the refrigerant flowing out of the indoor heat exchanger. The second check valve is provided on the refrigerant flow path and is located between the second flow path end and the outdoor heat exchanger, and is used to unidirectionally guide the refrigerant flowing out of the outdoor heat exchanger flow path. The refrigerant flow path further includes a diversion flow path. One end of the diversion flow path is connected between the first check valve and the indoor heat exchanger, and the other end of the diversion flow path is connected between the second check valve and the outdoor heat exchanger. The third check valve is provided on the diversion flow path and is used to unidirectionally guide the refrigerant flowing out of the indoor heat exchanger.

3. The heat pump system according to claim 2, wherein, A first throttling element is provided on the refrigerant circulation flow path, and the first throttling element is located between the second flow path end and the indoor heat exchanger; and / or, A second throttling element is provided on the refrigerant heat exchange flow path, and the second throttling element is located between the heat exchanger and the second flow path end; and / or, A third throttling element is provided on the refrigerant circulation flow path, and the third throttling element is located between the second check valve and the outdoor heat exchanger.

4. The heat pump system according to claim 3, characterized in that, When the refrigerant is in the first circulation flow state; The first throttling element throttles, the second throttling element closes, and the third throttling element is fully open. After the refrigerant passes through the outdoor heat exchanger, it flows through the indoor heat exchanger and returns to the compressor, so that the heat pump system has a refrigeration mode; and / or, The first throttling element is closed, the second throttling element is fully open, and the third throttling element throttles. After the refrigerant passes through the outdoor heat exchanger, it flows through the heat exchanger and returns to the compressor, so that the heat pump system has a defrosting mode.

5. The heat pump system according to claim 3, wherein The heat pump system further includes an indoor fan provided corresponding to the indoor heat exchanger. When the refrigerant is in the second circulating flow state; The first throttling element throttles, the second throttling element is fully open, the third throttling element throttles or is fully open, and the indoor fan is turned on. After the refrigerant passes through the heat exchanger, it returns to the compressor after passing through the indoor heat exchanger and the outdoor heat exchanger in sequence, so that the heat pump system has a heat storage refrigeration mode; and / or The first throttling element is fully open, the second throttling element is fully open, the third throttling element throttles, and the indoor fan is turned off. After the refrigerant passes through the heat exchanger, it returns to the compressor after passing through the indoor heat exchanger and the outdoor heat exchanger in sequence, so that the heat pump system has a heat storage mode; and / or The first throttling element throttles or is fully open, the second throttling element is fully open, the third throttling element throttles, and the indoor fan is turned on. After the refrigerant passes through the heat exchanger, it returns to the compressor after passing through the indoor heat exchanger and the outdoor heat exchanger in sequence, so that the heat pump system has a heat storage heating mode.

6. A control method for a heat pump system, based on the heat pump system according to any one of claims 1 to 5, characterized in that, A water heat exchange flow path capable of heat exchanging with the refrigerant heat exchange flow path is further formed in the heat exchanger. A water tank is provided on the water heat exchange flow path. The heat pump system further includes an indoor fan provided corresponding to the indoor heat exchanger; The control method of the heat pump system includes: Obtaining the temperature adjustment requirement indoors and the current water temperature of the water tank; Obtaining the set water temperature selected by the user, and determining a reference temperature according to the set water temperature and the preset shutdown temperature of the compressor; Judging whether the current water temperature is less than the reference temperature to obtain a judgment result; Based on the judgment result and the temperature adjustment requirement, determining the current working mode of the heat pump system, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current working mode.

7. The control method of the heat pump system according to claim 6, characterized in that The working mode of the heat pump system includes a heat storage refrigeration mode. When the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is less than the reference temperature; The determining the current working mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current working mode includes: Based on the judgment result and the temperature adjustment requirement, determining that the current working mode of the heat pump system is a heat storage refrigeration mode; Controlling the four-way valve according to the heat storage refrigeration mode to switch the suction port of the compressor to communicate with the outdoor heat exchanger, the first throttling element throttles, the second throttling element is fully open, and the third throttling element throttles or is fully open.

8. The control method of the heat pump system according to claim 6, characterized in that, The operating modes of the heat pump system include a refrigeration mode, when the temperature adjustment requirement is a refrigeration requirement and the judgment result is that the current water temperature is greater than or equal to the reference temperature; Determining the current operating mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current operating mode, including: Determining that the current operating mode of the heat pump system is the refrigeration mode based on the judgment result and the temperature adjustment requirement; Controlling the four-way valve to switch the exhaust port of the compressor to communicate with the outdoor heat exchanger according to the refrigeration mode, throttling the first throttling element, closing the second throttling element, and fully opening the third throttling element.

9. The control method of the heat pump system according to claim 6, characterized in that, The operating modes of the heat pump system include a heat storage heating mode, when the temperature adjustment requirement is a heating requirement and the judgment result is that the current water temperature is less than the reference temperature; Determining the current operating mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current operating mode, including: Determining that the current operating mode of the heat pump system is the heat storage heating mode based on the judgment result and the temperature adjustment requirement; Controlling the four-way valve to switch the suction port of the compressor to communicate with the outdoor heat exchanger according to the heat storage heating mode, throttling or fully opening the first throttling element, fully opening the second throttling element, and throttling the third throttling element.

10. The control method of the heat pump system according to claim 6, characterized in that, The operating modes of the heat pump system include a heat storage mode, when the temperature adjustment requirement is no requirement and the judgment result is that the current water temperature is less than the reference temperature; Determining the current operating mode of the heat pump system based on the judgment result and the temperature adjustment requirement, and controlling the four-way valve, the first throttling element, the second throttling element, the third throttling element, and the indoor fan respectively according to the current operating mode, including: Determining that the current operating mode of the heat pump system is the heat storage mode based on the judgment result and the temperature adjustment requirement; Controlling the four-way valve to switch the suction port of the compressor to communicate with the outdoor heat exchanger according to the heat storage mode, fully opening the first throttling element, fully opening the second throttling element, throttling the third throttling element, and closing the indoor fan.

11. The control method of the heat pump system according to claim 6, characterized in that, It further includes: Obtaining the current ambient temperature; When the current ambient temperature meets the first preset temperature condition, obtaining multiple defrosting temperatures of the outdoor heat exchanger at preset time intervals, and determining the temperature drop rate according to the multiple defrosting temperatures; When the current defrosting temperature of the outdoor heat exchanger meets the second preset temperature condition and the current temperature drop rate meets the preset temperature change condition, determining that the operating mode of the heat pump system is the defrosting mode; Controlling the four-way valve to switch the exhaust port of the compressor to communicate with the outdoor heat exchanger according to the defrosting mode, closing the first throttling element, fully opening the second throttling element, and throttling the third throttling element.

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