Heat pump system, heating and ventilation equipment, control method and electronic equipment

Abstract

The invention discloses a heat pump system, heating and ventilation equipment, a control method and electronic equipment. The heat pump system comprises a supercooling pipeline, a bypass pipeline, a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger. The compressor communicates with the first end of the outdoor heat exchanger and the first end of the indoor heat exchanger, the throttling device communicates with the second end of the outdoor heat exchanger and the second end of the indoor heat exchanger, the supercooling pipeline communicates with the second end of the outdoor heat exchanger and the throttling device, and one end of the bypass pipeline is connected between the supercooling pipeline and the outdoor heat exchanger. When the compressor is in a working state, the outdoor heat exchanger serves as an evaporator to play a role, the indoor heat exchanger serves as a condenser to play a role, and the refrigerant pressure of the air inlet end of the compressor is smaller than a first preset value, the bypass pipeline communicates with the outdoor heat exchanger and the throttling device. In this way, the refrigerant can flow in the bypass pipeline, and the influence of the supercooling pipeline on the flowing speed of the refrigerant is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a heat pump system, HVAC equipment, a control method and electronic equipment. Background Art

[0002] At present, air conditioners have basic functions such as cooling and heating. Air conditioners include evaporators and condensers. A subcooling pipe is installed in the evaporator pipe. In a low temperature environment, refrigerant is deposited in the subcooling pipe. When the heating mode is turned on, the refrigerant has a large resistance in the subcooling pipe, resulting in a slower flow rate of the refrigerant, affecting the heating effect of the air conditioner. Summary of the Invention

[0003] The present invention provides a heat pump system, heating and ventilation equipment, a control method and electronic equipment.

[0004] An embodiment of the present application provides a heat pump system, including a subcooling pipe, a bypass pipe, a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger; a first end of the outdoor heat exchanger is connected to a first end of the indoor heat exchanger through the compressor, and a second end of the outdoor heat exchanger is connected to a second end of the indoor heat exchanger through the throttling device; a first end of the subcooling pipe is connected to the second end of the outdoor heat exchanger, the second end of the subcooling pipe is connected to the throttling device, and the second end of the outdoor heat exchanger is connected to the throttling device through the subcooling pipe; one end of the bypass pipe is connected between the subcooling pipe and the outdoor heat exchanger, and the other end is connected between the subcooling pipe and the throttling device. When the compressor is in working condition, the outdoor heat exchanger functions as an evaporator, the indoor heat exchanger functions as a condenser and the refrigerant pressure at the compressor inlet end is less than a first preset value, the outdoor heat exchanger is connected to the throttling device through the bypass pipe.

[0005] In this way, by providing a bypass pipe, the refrigerant can flow in the bypass pipe, reducing the impact of the supercooling pipe on the flow velocity of the refrigerant, thereby improving the heat exchange efficiency of the heat pump system.

[0006] In some embodiments, a valve is provided on the bypass pipe. When the compressor is in operation, the outdoor heat exchanger functions as an evaporator, the indoor heat exchanger functions as a condenser, and the refrigerant pressure at the compressor inlet end is less than a first preset value, the valve is in an open state to allow the outdoor heat exchanger to be connected to the throttling device through the bypass pipe.

[0007] In certain embodiments, the heat pump system includes a sensor for detecting the refrigerant pressure at the compressor inlet.

[0008] In certain embodiments, the heat pump system includes a reversing valve, which is used to switch the flow direction of the refrigerant.

[0009] In some embodiments, the reversing valve includes four valve ports, which are respectively connected to the air inlet end, the air exhaust end, the first end of the outdoor heat exchanger, and the first end of the indoor heat exchanger of the compressor. One of the air inlet end and the air exhaust end is connected to the first end of the outdoor heat exchanger through the valve port, and the other of the air inlet end and the air exhaust end is connected to the first end of the indoor heat exchanger through the valve port.

[0010] In certain embodiments, the subcooling pipe is disposed at the bottom of the outdoor heat exchanger.

[0011] An embodiment of the present application provides a HVAC device including a heat pump system.

[0012] The present application provides a control method for a heat pump system, the method comprising:

[0013] When the compressor is in standby mode, the bypass pipe is controlled to be in a stagnant state;

[0014] When the compressor is in operation, the state of the bypass pipe is controlled according to the functions of the outdoor heat exchanger and the indoor heat exchanger.

[0015] In certain embodiments, controlling the state of the bypass pipe according to the functions of the outdoor heat exchanger and the indoor heat exchanger includes:

[0016] When the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, the bypass pipe is controlled to be in a stagnant state;

[0017] When the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser, the state of the bypass pipe is controlled according to the refrigerant pressure at the compressor inlet end.

[0018] In certain embodiments, controlling the state of the bypass pipe according to the refrigerant pressure at the compressor inlet end includes:

[0019] When the refrigerant pressure at the compressor inlet end is less than a first preset value, the bypass pipe is controlled to be in a flow state;

[0020] When the refrigerant pressure at the compressor inlet end is greater than or equal to a second preset value and lasts longer than a preset time, the bypass pipeline is controlled to be in a stagnant state, and the second preset value is greater than the first preset value.

[0021] An embodiment of the present application provides an electronic device, including a processor and a memory, wherein the memory stores a computer program. When the computer program is executed by the processor, the processor implements the instructions of the above-mentioned control method.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0024] Figure 1 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention;

[0025] Figure 2 It is a flowchart of a control method according to an embodiment of the present invention.

[0026] Explanation of the accompanying drawings: 100, heat pump system; 10, subcooling pipe; 20, bypass pipe; 21, valve; 30, compressor; 40, outdoor heat exchanger; 50, throttling device; 60, indoor heat exchanger; 70, sensor; 80, reversing valve; 81, first valve port; 82, second valve port; 83, third valve port; 84, fourth valve port. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0032] See also Figure 1The embodiment of the present application provides a heat pump system 100 including a subcooling pipe 10, a bypass pipe 20, a compressor 30, an outdoor heat exchanger 40, a throttling device 50 and an indoor heat exchanger 60; the first end 41 of the outdoor heat exchanger 40 is connected to the first end 61 of the indoor heat exchanger 60 through the compressor 30, and the second end 42 of the outdoor heat exchanger 40 is connected to the second end 62 of the indoor heat exchanger 60 through the throttling device 50; the first end 11 of the subcooling pipe 10 is connected to the second end 42 of the outdoor heat exchanger 40, and the second end 12 of the subcooling pipe 10 is connected to the throttling device The outdoor heat exchanger 40 is connected to the throttling device 50, and the second end 42 of the outdoor heat exchanger 40 is connected to the throttling device 50 through the subcooling pipe 10; one end of the bypass pipe 20 is connected between the subcooling pipe 10 and the outdoor heat exchanger 40, and the other end is connected between the subcooling pipe 10 and the throttling device 50. When the compressor 30 is in working state, the outdoor heat exchanger 40 functions as an evaporator, the indoor heat exchanger 60 functions as a condenser, and the refrigerant pressure at the air inlet end of the compressor 30 is less than the first preset value, the outdoor heat exchanger 40 is connected to the throttling device 50 through the bypass pipe 20.

[0033] In this way, by providing the bypass pipe 20 , the refrigerant can flow in the bypass pipe 20 , reducing the influence of the supercooling pipe 10 on the flow velocity of the refrigerant, thereby improving the heat exchange efficiency of the heat pump system 100 .

[0034] The embodiment of the present application provides a heating and ventilation equipment, including a heat pump system 100. Specifically, the heating and ventilation equipment may include an outdoor unit and an indoor unit, a compressor 30 and an outdoor heat exchanger 40 are located in the outdoor unit, an indoor heat exchanger 60 is located in the indoor unit, and a throttling device 50 may be located in the indoor unit or the outdoor unit.

[0035] One of the outdoor heat exchanger 40 and the indoor heat exchanger 60 may be a condenser, and the other may be an evaporator. The compressor 30 compresses the low-pressure gaseous refrigerant into high-pressure gaseous refrigerant and discharges it. The discharged high-pressure gaseous refrigerant flows into the condenser. The condenser condenses the high-pressure gaseous refrigerant into medium- and high-pressure liquid refrigerant, releasing heat into the surrounding environment through the condensation process. The throttling device 50 expands the medium- and high-pressure liquid refrigerant condensed in the condenser into medium- and low-pressure liquid refrigerant. The evaporator evaporates the medium- and low-pressure liquid refrigerant expanded in the throttling device 50 into low-pressure gaseous refrigerant and returns the low-pressure gaseous refrigerant to the compressor 30. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the medium to be cooled. Throughout this cycle, the HVAC equipment can regulate the temperature of the indoor space. The throttling device 50 may be an expansion valve, or more specifically, an electronic expansion valve.

[0036] When the HVAC equipment is in cooling mode, that is, when the refrigerant flows from the outdoor heat exchanger 40 to the indoor heat exchanger 60 through the throttling device 50, the supercooling pipe 10 can cool the refrigerant from the outdoor heat exchanger 40 again to improve the cooling effect of the HVAC equipment.

[0037] The heat pump system 100 has a first connecting pipe 51 , one end of which is connected to the second end 62 of the indoor heat exchanger 60 , and the other end of the first connecting pipe 51 is connected to the second end 12 of the supercooling pipe 10 , and the throttling device 50 is connected in series to the first connecting pipe 51 .

[0038] One end of the bypass pipe 20, the first end 11 of the subcooling pipe 10, and the second end 42 of the outdoor heat exchanger 40 are interconnected. The other end of the bypass pipe 20 is connected to the first connecting pipe 51 and is located between the second end 12 of the subcooling pipe 10 and the throttling device 50. In other words, the other end of the bypass pipe 20 is connected to the end of the throttling device 50 away from the indoor heat exchanger 60.

[0039] In some embodiments, the subcooling pipe 10 is disposed at the bottom of the outdoor heat exchanger 40. This allows the subcooling pipe 10 to be closer to the outdoor heat exchanger 40, facilitating connection between the subcooling pipe 10 and the outdoor heat exchanger 40. Furthermore, the location of the subcooling pipe 10 allows for more efficient use of the space within the HVAC equipment outdoor unit, making the HVAC equipment outdoor unit more compact.

[0040] See also Figure 1 In some embodiments, a valve 21 is provided on the bypass pipe 20. When the compressor 30 is in operation, the outdoor heat exchanger 40 functions as an evaporator, the indoor heat exchanger 60 functions as a condenser, and the refrigerant pressure at the air inlet end of the compressor 30 is less than a first preset value, the valve 21 is in an open state to allow the outdoor heat exchanger 40 to communicate with the throttling device 50 through the bypass pipe 20.

[0041] In this way, the bypass pipe 20 can be opened and closed by the valve 21, thereby controlling the flow path of the refrigerant.

[0042] Specifically, the valve 21 can be a one-way valve, a two-way valve or an electric stop valve. The bypass pipe 20 can be opened and closed by controlling the opening and closing of the valve 21, and the flow of the refrigerant in the bypass pipe 20 can be adjusted by controlling the opening size of the valve 21.

[0043] See also Figure 1 In some embodiments, the heat pump system 100 includes a sensor 70 , which is used to detect the refrigerant pressure at the intake end of the compressor 30 .

[0044] In this way, the refrigerant pressure at the air inlet end of the compressor 30 can be detected by the sensor 70, so as to control the on-off of the bypass pipe 20 according to the refrigerant pressure at the air inlet end of the compressor 30, thereby controlling the flow path of the refrigerant.

[0045] Specifically, the sensor 70 may be a pressure sensor, including but not limited to a resistive type, a piezoresistive type, a capacitive type, a piezoelectric type, etc. The pressure sensor converts the pressure signal of the refrigerant into an electrical signal.

[0046] See also Figure 1 In some embodiments, the heat pump system 100 includes a reversing valve 80, which is used to switch the flow direction of the refrigerant. In this way, by switching the flow direction of the refrigerant through the reversing valve 80, the operating mode of the HVAC equipment can be switched.

[0047] See also Figure 1 In some embodiments, the reversing valve 80 includes four valve ports, which are respectively connected to the air inlet end 31, the exhaust end 32, the outdoor heat exchanger 40 and the indoor heat exchanger 60 of the compressor 30. One of the outdoor heat exchanger 40 and the indoor heat exchanger 60 is connected to the air inlet end 31, and the other is connected to the exhaust end 32.

[0048] In this way, by switching the connection states of the four valve ports, the exhaust end 32 of the compressor 30 can selectively deliver high-pressure gaseous refrigerant to the outdoor heat exchanger 40 or the indoor heat exchanger 60, thereby changing the flow direction of the refrigerant.

[0049] Specifically, the four valve ports of the reversing valve 80 are the first valve port 81, the second valve port 82, the third valve port 83 and the fourth valve port 84. The first valve port 81 is connected to the exhaust end 32 of the compressor 30, the second valve port 82 is connected to the first end 41 of the outdoor heat exchanger 40, the third valve port 83 is connected to the first end 61 of the indoor heat exchanger 60, and the fourth valve port 84 is connected to the intake end 31 of the compressor 30.

[0050] When the HVAC system is in cooling mode, the first valve port 81 connects to the second valve port 82, connecting the exhaust port 32 of the compressor 30 to the outdoor heat exchanger 40. The third valve port 83 connects to the fourth valve port 84, connecting the intake port 31 of the compressor 30 to the indoor heat exchanger 60. The high-pressure gaseous refrigerant in the compressor 30 flows from the exhaust port 32 through the first valve port 81 and the second valve port 82 to the outdoor heat exchanger 40. The high-pressure gaseous refrigerant releases heat and condenses in the outdoor heat exchanger 40, and the outdoor heat exchanger 40 now functions as a condenser. The high-pressure liquid refrigerant from the outdoor heat exchanger 40 becomes low-pressure liquid refrigerant after passing through the throttling device 50 and then enters the indoor heat exchanger 60. The indoor heat exchanger 60 now functions as an evaporator. The low-pressure liquid refrigerant evaporates and absorbs heat in the indoor heat exchanger 60, becoming low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant then passes through the third valve port 83 and the fourth valve port 84 and enters the compressor 30, completing a cycle.

[0051] When the HVAC system is in heating mode, the first valve port 81 connects to the third valve port 83, connecting the exhaust port 32 of the compressor 30 to the indoor heat exchanger 60. The second valve port 82 connects to the fourth valve port 84, connecting the intake port 31 of the compressor 30 to the outdoor heat exchanger 40. The high-pressure gaseous refrigerant in the compressor 30 flows from the exhaust port 32 through the first valve port 81 and the third valve port 83 to the indoor heat exchanger 60. The high-pressure gaseous refrigerant releases heat and condenses in the indoor heat exchanger 60, and the indoor heat exchanger 60 now functions as a condenser. The high-pressure liquid refrigerant from the indoor heat exchanger 60 becomes low-pressure liquid refrigerant after passing through the throttling device 50 and then enters the outdoor heat exchanger 40. The outdoor heat exchanger 40 now functions as an evaporator. The low-pressure liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 40, becoming low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant then enters the compressor 30 through the second valve port 82 and the fourth valve port 84, completing a cycle.

[0052] like Figure 1 As shown, the heat pump system 100 further includes a second connecting pipe 52 , one end of the second connecting pipe 52 is connected to the fourth valve port 84 , and the other end is connected to the air intake end 31 of the compressor 30 . The sensor 70 is connected to the second connecting pipe 52 .

[0053] See also Figure 2 , an embodiment of the present application provides a control method for a heat pump system 100, the method comprising:

[0054] S10, when the compressor 30 is in standby state, the bypass pipe 20 is controlled to be in a stagnant state; when the compressor 30 is in working state, the state of the bypass pipe 20 is controlled according to the functions of the outdoor heat exchanger 40 and the indoor heat exchanger 60.

[0055] In this way, the state of the bypass pipe 20 can be controlled by the state of the compressor 30 to control the flow path of the refrigerant.

[0056] Specifically, the compressor 30 is in standby mode, the difference between the current indoor ambient temperature and the target temperature is small, and the required amount of refrigerant is small, so there is no need for the bypass pipe 20, and the refrigerant flowing through the cold pipe 10 can meet the demand.

[0057] The state of the bypass pipe 20 can be a stagnant state and a flowing state. When the bypass pipe 20 is in a stagnant state, the bypass pipe 20 disconnects the outdoor heat exchanger 40 and the indoor heat exchanger 60, and the refrigerant flows in the supercooling pipe 10. When the bypass pipe 20 is in a flowing state, the bypass pipe 20 connects the outdoor heat exchanger 40 and the indoor heat exchanger 60, and the refrigerant flows in the supercooling pipe 10 and the bypass pipe 20.

[0058] The state of the bypass pipe 20 can be controlled by controlling the state of the valve 21. For example, when the valve 21 is open, the bypass pipe 20 is in a flow state, and when the valve 21 is closed, the bypass pipe 20 is in a stagnant state.

[0059] See also Figure 2 In some embodiments, controlling the state of the bypass pipe 20 (step S10) according to the functions of the outdoor heat exchanger 40 and the indoor heat exchanger 60 includes:

[0060] S20, when the outdoor heat exchanger 40 functions as a condenser and the indoor heat exchanger 60 functions as an evaporator, the bypass pipe 20 is controlled to be in a stagnant state; when the outdoor heat exchanger 40 functions as an evaporator and the indoor heat exchanger 60 functions as a condenser, the state of the bypass pipe 20 is controlled according to the refrigerant pressure at the air inlet end 31 of the compressor 30.

[0061] In this way, the state of the bypass pipe 20 can be controlled by the functions of the outdoor heat exchanger 40 and the indoor heat exchanger 60, thereby controlling the flow path of the refrigerant.

[0062] Specifically, when the outdoor heat exchanger 40 functions as a condenser and the indoor heat exchanger 60 functions as an evaporator, the refrigerant flows from the outdoor heat exchanger 40 to the indoor heat exchanger 60 through the throttling device 50. At this time, the HVAC equipment is in cooling mode, the ambient temperature is high, and the risk of refrigerant deposition in the subcooling pipe 10 is small. Therefore, there is no need for a bypass pipe 20, and the refrigerant can enter the indoor heat exchanger 60 from the outdoor heat exchanger 40 through the subcooling pipe 10.

[0063] When the outdoor heat exchanger 40 functions as an evaporator and the indoor heat exchanger 60 functions as a condenser, the refrigerant flows from the indoor heat exchanger 60 to the outdoor heat exchanger 40 through the throttling device 50. At this time, the HVAC equipment is in heating mode, the ambient temperature is low, and the risk of refrigerant deposition in the subcooling pipe 10 is greater. Therefore, the resistance of the refrigerant from the indoor heat exchanger 60 to the outdoor heat exchanger 40 through the subcooling pipe 10 is greater, and the bypass pipe 20 is conducive to the transportation of the refrigerant.

[0064] See also Figure 2 In some embodiments, controlling the state of the bypass pipe 20 according to the refrigerant pressure at the air inlet 31 of the compressor 30 (step S20) includes:

[0065] S30, when the refrigerant pressure at the air inlet end 31 of the compressor 30 is less than the first preset value, the bypass pipe 20 is controlled to be in a flow state; when the refrigerant pressure at the air inlet end 31 of the compressor 30 is greater than or equal to the second preset value, and the duration is greater than the preset time, the bypass pipe 20 is controlled to be in a stagnant state, and the second preset value is greater than the first preset value.

[0066] In this way, the state of the bypass pipe 20 can be controlled by the refrigerant pressure at the air inlet end 31 of the compressor 30 to control the flow path of the refrigerant.

[0067] Specifically, the first preset value, the second preset value and the preset time can be designed according to actual needs. For example, the lower the ambient temperature and the greater the amount of refrigerant deposition, the greater the second preset value and the longer the preset time.

[0068] As the refrigerant pressure at the air inlet end 31 of the compressor 30 increases, the refrigerant deposited in the subcooling pipe 10 gradually flows into the outdoor heat exchanger 40. When the refrigerant pressure at the air inlet end 31 of the compressor 30 is greater than or equal to the second preset value and the duration is greater than the preset time, the refrigerant deposited in the subcooling pipe 10 is greatly reduced, and the resistance in the subcooling pipe 10 is small, which is conducive to the passage of the refrigerant from the indoor heat exchanger 60.

[0069] In one embodiment, the second preset value is 0.02 MPa, and the preset time is 3 minutes. That is, when the refrigerant pressure at the air inlet end 31 of the compressor 30 is greater than or equal to 0.02 MPa and lasts for 3 minutes, the bypass pipe 20 is controlled to be in a stagnant state, so that the refrigerant enters the outdoor heat exchanger 40 from the subcooling pipe 10.

[0070] In summary, the conditions for the bypass pipe 20 to be in a flow state are as follows: the compressor 30 is in working state, the HVAC equipment is in heating mode, that is, the outdoor heat exchanger 40 functions as an evaporator, the indoor heat exchanger 60 functions as a condenser, and the refrigerant pressure at the air inlet end 31 of the compressor 30 is less than the first preset value.

[0071] The present application provides an electronic device including a processor and a memory, wherein the memory stores a computer program that, when executed by the processor, causes the processor to implement the instructions of the control method described above. For example, the processor is configured to control the state of valve 21 and thereby control the state of bypass conduit 20.

[0072] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0073] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A heat pump system, characterized in that: include: A compressor, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger, wherein a first end of the outdoor heat exchanger is communicated with a first end of the indoor heat exchanger through the compressor, and a second end of the outdoor heat exchanger is communicated with a second end of the indoor heat exchanger through the throttling device; a subcooling pipe, wherein a first end of the subcooling pipe is in communication with a second end of the outdoor heat exchanger, a second end of the subcooling pipe is in communication with the throttling device, and the second end of the outdoor heat exchanger is in communication with the throttling device through the subcooling pipe; and A bypass pipe, one end of the bypass pipe is connected between the subcooling pipe and the outdoor heat exchanger, and the other end is connected between the subcooling pipe and the throttling device. When the compressor is in working state, the outdoor heat exchanger functions as an evaporator, the indoor heat exchanger functions as a condenser, and the refrigerant pressure at the air inlet end of the compressor is less than a first preset value, the outdoor heat exchanger is connected to the throttling device through the bypass pipe.

2. The heat pump system according to claim 1, characterized in that A valve is provided on the bypass pipe. When the compressor is in working state, the outdoor heat exchanger functions as an evaporator, the indoor heat exchanger functions as a condenser, and the refrigerant pressure at the air inlet end of the compressor is less than the first preset value, the valve is in an open state to allow the outdoor heat exchanger to be connected to the throttling device through the bypass pipe.

3. The heat pump system according to claim 1, characterized in that The heat pump system includes a sensor, which is used to detect the refrigerant pressure at the air inlet end of the compressor.

4. The heat pump system according to claim 1, characterized in that The heat pump system includes a reversing valve, which is used to switch the flow direction of the refrigerant.

5. The heat pump system according to claim 4, characterized in that The reversing valve includes four valve ports, which are respectively connected to the air inlet end, the exhaust end, the first end of the outdoor heat exchanger and the first end of the indoor heat exchanger of the compressor. One of the air inlet end and the exhaust end is connected to the first end of the outdoor heat exchanger through the valve port, and the other of the air inlet end and the exhaust end is connected to the first end of the indoor heat exchanger through the valve port.

6. The heat pump system according to claim 1, characterized in that The supercooling pipe is arranged at the bottom of the outdoor heat exchanger.

7. A HVAC equipment, characterized in that: A heat pump system comprising any one of claims 1 to 6.

8. A control method for the heat pump system according to any one of claims 1 to 6, characterized in that: The method comprises: When the compressor is in a standby state, controlling the bypass pipe to be in a stagnant state; When the compressor is in an operating state, the state of the bypass pipe is controlled according to the functions performed by the outdoor heat exchanger and the indoor heat exchanger.

9. The control method according to claim 8, characterized in that: The controlling the state of the bypass pipe according to the functions of the outdoor heat exchanger and the indoor heat exchanger includes: When the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, controlling the bypass pipe to be in a stagnant state; When the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser, the state of the bypass pipe is controlled according to the refrigerant pressure at the intake end of the compressor.

10. The control method according to claim 9, characterized in that: The controlling the state of the bypass pipe according to the refrigerant pressure at the air inlet end of the compressor includes: When the refrigerant pressure at the compressor inlet end is less than a first preset value, controlling the bypass pipe to be in a flow state; When the refrigerant pressure at the compressor intake end is greater than or equal to a second preset value and lasts longer than a preset time, the bypass pipe is controlled to be in a stagnant state, and the second preset value is greater than the first preset value.

11. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor implements the instructions of the control method according to any one of claims 8 to 10.

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