Heat pump system and control method thereof

Abstract

The present invention provides a heat pump system and a control method thereof, wherein the heat pump system includes a compressor, an outdoor heat exchanger, an indoor temperature-adjusting heat exchanger, and an indoor dehumidifying heat exchanger. When the heat pump system is in a cooling mode, the refrigerant output side of the outdoor heat exchanger is connected to the indoor temperature-adjusting heat exchanger through a first pipeline and to the indoor dehumidifying heat exchanger through a second pipeline. A first throttling element and a second throttling element are sequentially arranged along the refrigerant flow direction on the first pipeline, and a third throttling element and a fourth throttling element are sequentially arranged along the refrigerant flow direction on the second pipeline. Heat exchange can be formed between the first pipeline and the second pipeline at an intermediate heat exchanger. According to the present invention, a transfer and distribution of cold energy is formed between the first pipeline and the second pipeline at the intermediate heat exchanger, thereby adjusting the cold energy in the indoor temperature-adjusting heat exchanger and the indoor dehumidifying heat exchanger, so that the adjustment of the compressor frequency can be reduced, the power consumption of the compressor can be reduced, and the system performance and the service life of the compressor can be improved.

Description

Technical Field

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

[0002] With the development of technology, air conditioning systems with independent temperature and humidity control have greater advantages than traditional air conditioning systems and are receiving more and more attention. In the temperature and humidity independent control air conditioning system, two evaporators with different evaporation temperatures are required to cool and dehumidify the air respectively. However, in the actual operation of the air conditioning system, the required target temperatures of the two evaporators with different evaporation temperatures are different under different working conditions, and the required cooling capacity is different, so the adjustment of the compressor is also different.

[0003] The related technology discloses an air-conditioning system and a control method for the air-conditioning system. The air-conditioning system includes two indoor heat exchangers, an outdoor heat exchanger and a three-cylinder variable-capacity compressor. The working displacement is adjusted by switching the state of the variable-capacity cylinder. In areas with hot summers and cold winters, the humidity is high and the temperature is high in July. The dual evaporation temperature operation mode with independent control of temperature and humidity can separate dehumidification and refrigeration. Since the outdoor ambient temperature is high, the load of the evaporator responsible for the refrigeration function is large. At this time, the compressor is switched to the three-cylinder operation mode. Compared with the two-cylinder mode, the refrigerant flow rate of the refrigeration flow path is increased to achieve rapid refrigeration. However, from the end of July to the beginning of September, the temperature is extremely high. At this time, the operating load is high, and the three-cylinder two-stage air replenishment operation mode needs to be used. However, when the load is slightly smaller, the frequency needs to be reduced. Due to the design of the compressor motor efficiency point and the leakage problem caused by the rotor machine's own structure, the capacity is greatly attenuated and the energy efficiency is reduced when the frequency is reduced. At this time, it is necessary to switch to the dual-cylinder air supply operation mode. The air-conditioning system meets the cooling demand of the two evaporators under different working conditions by switching the compressor cylinders. The compressor structure and switching of this system are complex, resulting in low system reliability and increased production costs, which is not conducive to large-scale promotion. Summary of the invention

[0004] Therefore, the present invention provides a heat pump system and a control method thereof, which can overcome the shortcomings of the heat pump system in the related art, such as complex compressor control, operation frequency adjustment frequency, and large compressor loss in order to achieve different cooling outputs.

[0005] In order to solve the above problems, the present invention provides a heat pump system, including a compressor, an outdoor heat exchanger, an indoor temperature-regulating heat exchanger, and an indoor dehumidifying heat exchanger. When the heat pump system is in a cooling mode, the refrigerant output side of the outdoor heat exchanger is connected to the indoor temperature-regulating heat exchanger through a first pipeline and to the indoor dehumidifying heat exchanger through a second pipeline. A first throttling element and a second throttling element are sequentially provided along the refrigerant flow direction of the first pipeline, and a third throttling element and a fourth throttling element are sequentially provided along the refrigerant flow direction of the second pipeline. Heat exchange can be formed between the first pipeline and the second pipeline at an intermediate heat exchanger. The intermediate heat exchanger is located between the first throttling element and the second throttling element and between the third throttling element and the fourth throttling element.

[0006] In some embodiments, the compressor is a dual-intake and single-exhaust twin-cylinder compressor, the twin-cylinder compressor comprising a first cylinder having a first intake port and a second cylinder having a second intake port, the exhaust of the first cylinder and the second cylinder are combined at the exhaust port of the twin-cylinder compressor, and the exhaust port of the twin-cylinder compressor is connected to the outdoor heat exchanger.

[0007] In some embodiments, the heat pump system also includes a four-way reversing valve, which has a first port, a second port, a third port and a fourth port. The exhaust port of the two-cylinder compressor is connected to the first port, the second port is connected to the indoor temperature control heat exchanger, the third port is connected to the first intake port, and the fourth port is connected to the outdoor heat exchanger.

[0008] In some embodiments, the indoor dehumidification heat exchanger is connected to the second air intake port via a third pipeline, and a first solenoid valve is provided on the third pipeline.

[0009] In some embodiments, the indoor temperature-control heat exchanger is connected to the second port via a fourth pipeline, a fifth pipeline is further provided between the fourth pipeline and the third pipeline, a second solenoid valve is provided on the fifth pipeline, one end of the fifth pipeline is connected to the third pipeline between the first solenoid valve and the indoor dehumidification heat exchanger, and the third port is connected to the first air intake port via a sixth pipeline, and the sixth pipeline and the third pipeline are selectively connected via the third solenoid valve.

[0010] In some embodiments, the indoor temperature regulating heat exchanger is capable of heat exchange with the water-cooled terminal.

[0011] The present invention also provides a control method for a heat pump system, which is used to control the above-mentioned heat pump system, comprising:

[0012] Get the operation mode of the heat pump system;

[0013] When the acquired operation mode is cooling mode;

[0014] Determine the heat exchange requirements of the indoor temperature control heat exchanger and the indoor dehumidification heat exchanger;

[0015] Determine whether to adjust the operating frequency of the two-cylinder compressor and the opening degree of the first throttling element and the third throttling element and make corresponding adjustments according to the heat exchange requirements of the indoor temperature control heat exchanger and the indoor dehumidification heat exchanger.

[0016] In some embodiments, determining whether to adjust the operating frequency of the two-cylinder compressor and the openings of the first throttling element and the third throttling element according to the heat exchange requirements of the indoor temperature control heat exchanger and the indoor dehumidification heat exchanger and making corresponding adjustments includes:

[0017] When the heat exchange requirements of the indoor temperature-regulating heat exchanger and the indoor dehumidifying heat exchanger both increase, the first throttling element and the third throttling element are controlled to be fully opened, and the operating frequency of the compressor is increased; or,

[0018] When the heat exchange requirements of the indoor temperature-regulating heat exchanger and the indoor dehumidifying heat exchanger are both reduced, the first throttling element and the third throttling element are controlled to be fully opened, and the operating frequency of the compressor is reduced; or,

[0019] When the heat exchange demand of the indoor temperature regulating heat exchanger decreases and the heat exchange demand of the indoor dehumidification heat exchanger increases, the opening of the first throttling element is controlled to decrease, the third throttling element is kept fully open, and the operating frequency of the compressor is kept unchanged; or,

[0020] When the heat exchange demand of the indoor temperature regulating heat exchanger remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger increases, the opening of the first throttling element is controlled to decrease, the third throttling element is kept fully open, and the operating frequency of the compressor is increased; or,

[0021] When the heat exchange demand of the indoor temperature regulating heat exchanger decreases and the heat exchange demand of the indoor dehumidification heat exchanger remains unchanged, the opening of the first throttling element is controlled to decrease, the third throttling element is kept fully open, and the operating frequency of the compressor is reduced; or,

[0022] When the heat exchange demand of the indoor temperature regulating heat exchanger increases and the heat exchange demand of the indoor dehumidification heat exchanger decreases, the opening degree of the third throttling element is controlled to decrease, the first throttling element is kept fully open, and the operating frequency of the compressor is kept unchanged; or,

[0023] When the heat exchange demand of the indoor temperature regulating heat exchanger increases and the heat exchange demand of the indoor dehumidification heat exchanger remains unchanged, the opening of the third throttling element is controlled to decrease, the first throttling element is kept fully open, and the operating frequency of the compressor is increased; or,

[0024] When the heat exchange demand of the indoor temperature regulating heat exchanger remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger decreases, the opening of the third throttling element is controlled to decrease, the first throttling element is kept fully open, and the operating frequency of the compressor is reduced.

[0025] In some embodiments, when the heat pump system includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a four-way reversing valve, the control method further includes:

[0026] When the acquired operation mode is the cooling mode, the first port of the four-way reversing valve is controlled to be connected to the fourth port, the second port is controlled to be connected to the third port, the first solenoid valve is controlled to be turned on, and the second solenoid valve and the third solenoid valve are controlled to be turned off; or,

[0027] When the acquired operation mode is the heating mode, the first port of the four-way reversing valve is controlled to be connected with the second port and the third port is controlled to be connected with the fourth port, the first solenoid valve is controlled to be cut off, and the second solenoid valve and the third solenoid valve are controlled to be connected.

[0028] In some embodiments, when the acquired operating mode is the heating mode, the first throttling element and the third throttling element are further controlled to be fully opened.

[0029] The present invention provides a heat pump system and a control method thereof, which produces a difference in the cooling capacity of the refrigerant in the first pipeline and the second pipeline by adjusting the opening of the first throttling element and / or the third throttling element, and forms a transfer and distribution of cooling capacity between the first pipeline and the second pipeline at the intermediate heat exchanger, thereby adjusting the cooling capacity in the indoor temperature control heat exchanger and the indoor dehumidification heat exchanger, thereby reducing the adjustment of the compressor frequency, reducing the compressor power consumption, and improving the system performance and the service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram (principle) of a heat pump system according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of refrigerant flow direction when the heat pump system operating mode is cooling mode;

[0032] Figure 3 for Figure 1 Schematic diagram of refrigerant flow when the heat pump system operates in heating mode.

[0033] The reference numerals are as follows:

[0034] 1. Compressor; 11. First cylinder; 12. Second cylinder; 2. Outdoor heat exchanger; 31. Indoor temperature-control heat exchanger; 32. Indoor dehumidification heat exchanger; 33. Water-cooled terminal; 41. First throttling element; 42. Second throttling element; 43. Third throttling element; 44. Fourth throttling element; 5. Intermediate heat exchanger; 6. Four-way reversing valve; 71. First solenoid valve; 72. Second solenoid valve; 73. Third solenoid valve. DETAILED DESCRIPTION

[0035] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a heat pump system is provided, including a compressor 1, an outdoor heat exchanger 2, an indoor temperature-regulating heat exchanger 31, and an indoor dehumidifying heat exchanger 32. When the heat pump system is in a cooling mode, the refrigerant output side of the outdoor heat exchanger 2 is connected to the indoor temperature-regulating heat exchanger 31 through a first pipeline and to the indoor dehumidifying heat exchanger 32 through a second pipeline. A first throttling element 41 (specifically, an electronic expansion valve) and a second throttling element 42 (specifically, an electronic expansion valve) are sequentially arranged along the refrigerant flow direction on the first pipeline, and a third throttling element 43 (specifically, an electronic expansion valve) is sequentially arranged along the refrigerant flow direction on the second pipeline. , a fourth throttling element 44 (specifically, an electronic expansion valve), heat exchange can be formed between the first pipeline and the second pipeline at the intermediate heat exchanger 5, and the intermediate heat exchanger 5 is located between the first throttling element 41 and the second throttling element 42 and between the third throttling element 43 and the fourth throttling element 44, wherein the indoor temperature control heat exchanger 31 can independently make necessary adjustments to the temperature of the air flow in the preset space or introduced, such as heating or cooling, and the indoor dehumidification heat exchanger 32 can independently remove the humidity of the air flow in the preset space or introduced, and the two can independently achieve temperature control or dehumidification, which can reduce the energy consumption of the heat pump system. In this technical solution, the opening of the first throttling element 41 and / or the third throttling element 43 is adjusted to produce a difference in the cooling capacity of the refrigerant in the first pipeline and the second pipeline, and a transfer and distribution of cooling capacity is formed between the first pipeline and the second pipeline at the intermediate heat exchanger 5, thereby adjusting the cooling capacity in the indoor temperature control heat exchanger 31 and the indoor dehumidification heat exchanger 32. In this way, the adjustment of the compressor frequency can be reduced, the compressor power consumption can be reduced, and the system performance and the service life of the compressor can be improved.

[0036] In some embodiments, the compressor 1 is a double-intake single-exhaust twin-cylinder compressor, the twin-cylinder compressor includes a first cylinder 11 having a first intake port and a second cylinder 12 having a second intake port, the exhaust of the first cylinder 11 and the second cylinder 12 are collected at the exhaust port of the compressor 1, and the exhaust port of the twin-cylinder compressor 1 is connected to the outdoor heat exchanger 2. In this technical solution, the use of a twin-intake single-exhaust twin-cylinder compressor can meet the maximum cooling capacity, improve system performance, reduce manufacturing costs, and avoid the shortcomings of the structure and control complexity of the enthalpy-increasing compressor or the three-cylinder compressor in the prior art.

[0037] In order to simplify the design of the heat pump system, in some embodiments, the heat pump system also includes a four-way reversing valve 6, the four-way reversing valve 6 has a first port, a second port, a third port and a fourth port, the exhaust port of the two-cylinder compressor 1 is connected to the first port, the second port is connected to the indoor temperature control heat exchanger 31, the third port is connected to the first air intake port, and the fourth port is connected to the outdoor heat exchanger 2.

[0038] The indoor dehumidification heat exchanger 32 is connected to the second air intake port via a third pipeline. A first solenoid valve 71 is provided on the third pipeline to control the on-off of the third pipeline, which is beneficial to the maintenance of pipelines and components.

[0039] In order to enable the heat pump system to operate in both cooling mode and heating mode, in some embodiments, the indoor temperature-adjusting heat exchanger 31 is connected to the second port through a fourth pipeline, a fifth pipeline is provided between the fourth pipeline and the third pipeline, a second solenoid valve 72 is provided on the fifth pipeline, one end of the fifth pipeline is connected to the third pipeline between the first solenoid valve 71 and the indoor dehumidification heat exchanger 32, and the third port is connected to the first air intake port through a sixth pipeline, and the sixth pipeline and the third pipeline are selectively connected through a third solenoid valve 73. In some embodiments, the indoor temperature-adjusting heat exchanger 31 can exchange heat with the water-cooled terminal 33, that is, the indoor temperature-adjusting heat exchanger 31 is not only provided with a pipeline for circulating refrigerant but also provided with a pipeline for circulating water, so that water and refrigerant form heat (or cold) exchange in the indoor temperature-adjusting heat exchanger 31.

[0040] According to an embodiment of the present invention, a control method of a heat pump system is further provided, which is used to control the above-mentioned heat pump system, comprising:

[0041] Acquire the operation mode of the heat pump system, when the acquired operation mode is cooling mode;

[0042] Determine the heat exchange requirements of the indoor temperature control heat exchanger 31 and the indoor dehumidification heat exchanger 32;

[0043] According to the heat exchange requirements of the indoor temperature control heat exchanger 31 and the indoor dehumidification heat exchanger 32, it is determined whether to adjust the operating frequency of the compressor 1 and the opening of the first throttling element 41 and the third throttling element 43 and make corresponding adjustments.

[0044] If instructions are required, the method for determining the heat exchange demand of the indoor temperature control heat exchanger 31 and the indoor dehumidification heat exchanger 32 may be carried out by conventional technical means in the field, for example, judging based on the indoor cooling load and the wet load, the heat exchange amount increases as the load increases, and the heat exchange amount decreases as the load decreases.

[0045] Determining whether to adjust the operating frequency of the compressor 1 and the openings of the first throttling element 41 and the third throttling element 43 according to the heat exchange requirements of the indoor temperature control heat exchanger 31 and the indoor dehumidification heat exchanger 32 and making corresponding adjustments includes:

[0046] When the heat exchange requirements of the indoor temperature-regulating heat exchanger 31 and the indoor dehumidifying heat exchanger 32 both increase, the first throttling element 41 and the third throttling element 43 are controlled to be fully opened, and the operating frequency of the compressor 1 is increased; or,

[0047] When the heat exchange requirements of the indoor temperature-regulating heat exchanger 31 and the indoor dehumidifying heat exchanger 32 are both reduced, the first throttling element 41 and the third throttling element 43 are controlled to be fully opened, and the operating frequency of the compressor 1 is reduced; or,

[0048] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 decreases and the heat exchange demand of the indoor dehumidification heat exchanger 32 increases, the opening of the first throttling element 41 is controlled to decrease, the third throttling element 43 is kept fully open, and the operating frequency of the compressor 1 is kept unchanged; or,

[0049] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger 32 increases, the opening of the first throttling element 41 is controlled to decrease, the third throttling element 43 is kept fully open, and the operating frequency of the compressor 1 is increased; or,

[0050] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 decreases and the heat exchange demand of the indoor dehumidification heat exchanger 32 remains unchanged, the opening of the first throttling element 41 is controlled to decrease, the third throttling element 43 is kept fully open, and the operating frequency of the compressor 1 is reduced; or,

[0051] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 increases and the heat exchange demand of the indoor dehumidification heat exchanger 32 decreases, the opening degree of the third throttling element 43 is controlled to decrease, the first throttling element 41 is kept fully open, and the operating frequency of the compressor 1 is kept unchanged; or,

[0052] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 increases and the heat exchange demand of the indoor dehumidification heat exchanger 32 remains unchanged, the opening degree of the third throttling element 43 is controlled to decrease, the first throttling element 41 is kept fully open, and the operating frequency of the compressor 1 is increased; or,

[0053] When the heat exchange demand of the indoor temperature regulating heat exchanger 31 remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger 32 decreases, the opening of the third throttling element 43 is controlled to decrease, the first throttling element 41 is kept fully open, and the operating frequency of the compressor 1 is reduced.

[0054] In some embodiments, when the heat pump system includes a first solenoid valve 71, a second solenoid valve 72, a third solenoid valve 73 and a four-way reversing valve 6, the control method further includes:

[0055] When the acquired operation mode is the cooling mode, the first port of the four-way reversing valve 6 is controlled to be connected to the fourth port, the second port is controlled to be connected to the third port, the first solenoid valve 71 is controlled to be turned on, and the second solenoid valve 72 and the third solenoid valve 73 are controlled to be turned off; or,

[0056] When the acquired operation mode is the heating mode, the first port of the four-way reversing valve 6 is controlled to be connected with the second port and the third port is controlled to be connected with the fourth port, the first solenoid valve 71 is controlled to be cut off, and the second solenoid valve 72 and the third solenoid valve 73 are controlled to be connected.

[0057] In some embodiments, when the acquired operation mode is the heating mode, the first throttling element 41 and the third throttling element 43 are also controlled to be fully opened.

[0058] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0059] (I) In cooling mode:

[0060] See also Figure 2 As shown, it can be divided into the following working conditions according to different needs:

[0061] Working condition 1: If the indoor temperature-control heat exchanger 31 and the indoor dehumidification heat exchanger 32 simultaneously require the compressor 1 (specifically a double-intake single-exhaust double-cylinder compressor, the same below) to increase the frequency (this indicates that the heat exchange demand increases, the same below) or reduce the frequency (this indicates that the heat exchange demand decreases, the same below), at this time, the frequency of the compressor 1 is increased or reduced, the first throttling element 41 and the third throttling element 43 are fully opened, and the intermediate heat exchanger 5 does not play a regulating role. The specific process is: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then is divided into two paths through the first throttling element 41 and the third throttling element 43 respectively to flow into the intermediate heat exchanger 5. At this time, the first throttling element 41 and the third throttling element 43 are fully opened (there will be no temperature difference), and the two refrigerants do not exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the second throttling element 42 (appropriately adjusting the opening of the electronic expansion valve), and then flows into the indoor temperature-regulating heat exchanger 31. After absorbing heat in the indoor temperature-regulating heat exchanger 31, it enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the fourth throttling element 44 (appropriately adjusting the opening of the electronic expansion valve), and then flows into the indoor dehumidification heat exchanger 32. After absorbing heat in the indoor dehumidification heat exchanger 32, it enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0062] Working condition 2: If the indoor temperature-control heat exchanger 31 requires compressor 1 to reduce its frequency, and the indoor dehumidification heat exchanger 32 requires compressor 1 to increase its frequency, the frequency of compressor 1 can be kept unchanged, the opening of the first throttling element 41 can be adjusted, and part of the cold energy can be transferred to the flow path of the indoor dehumidification heat exchanger 32 through the intermediate heat exchanger 5. The specific process is as follows: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths. The first path of refrigerant flows into the intermediate heat exchanger 5 after being throttled by the first throttling element 41, and the second path of refrigerant flows into the intermediate heat exchanger 5 through the third throttling element 43. At this time, the first throttling element 41 changes from fully open to closed, and the third throttling element 43 remains fully open. The two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor temperature-regulating heat exchanger 31 through the second throttling element 42 (appropriately adjust the opening of the electronic expansion valve), absorbs heat in the indoor temperature-regulating heat exchanger 31, enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the fourth throttling element 44 (appropriately adjust the opening of the electronic expansion valve), and then flows into the indoor dehumidification heat exchanger 32. After absorbing heat in the indoor dehumidification heat exchanger 32, it enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0063] Working condition three: If the indoor temperature-control heat exchanger 31 requires the compressor 1 frequency to remain unchanged (indicating that the heat exchange demand remains unchanged), and the indoor dehumidification heat exchanger 32 requires the compressor 1 to increase its frequency, then the compressor 1 frequency can be appropriately increased, the first throttling element 41 opening can be adjusted, and part of the cold energy can be transferred to the flow path where the indoor dehumidification heat exchanger 32 is located through the intermediate heat exchanger 5. The specific process is as follows: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths. The first path of refrigerant flows into the intermediate heat exchanger 5 after being throttled by the first throttling element 41, and the second path of refrigerant flows into the intermediate heat exchanger 5 through the third throttling element 43. At this time, the first throttling element 41 changes from fully open to closed, and the third throttling element 43 remains fully open. The two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor temperature-regulating heat exchanger 31 through the second throttling element 42 (appropriately adjust the opening of the electronic expansion valve), absorbs heat in the indoor temperature-regulating heat exchanger 31, enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the fourth throttling element 44 (appropriately adjust the opening of the electronic expansion valve), and then flows into the indoor dehumidification heat exchanger 32. After absorbing heat in the indoor dehumidification heat exchanger 32, it enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0064] Working condition 4: If the indoor temperature-control heat exchanger 31 requires the compressor 1 to reduce its frequency, and the indoor dehumidification heat exchanger 32 requires the compressor 1 to remain unchanged in frequency, the frequency of the compressor 1 can be appropriately reduced at this time, the opening of the first throttling element 41 can be adjusted, and part of the cold energy can be transferred to the flow path where the indoor dehumidification heat exchanger 32 is located through the intermediate heat exchanger 5. The specific process is: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths. The first path of refrigerant flows into the intermediate heat exchanger 5 after throttling by the first throttling element 41, and the second path of refrigerant flows into the intermediate heat exchanger 5 through the third throttling element 43. At this time, the first throttling element 41 changes from fully open to closed, and the third throttling element 43 remains fully open. The two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor temperature-regulating heat exchanger 31 through the second throttling element 42 (appropriately adjust the opening of the electronic expansion valve), absorbs heat in the indoor temperature-regulating heat exchanger 31, enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the fourth throttling element 44 (appropriately adjust the opening of the electronic expansion valve), and then flows into the indoor dehumidification heat exchanger 32. After absorbing heat in the indoor dehumidification heat exchanger 32, it enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0065] Working condition five: if the indoor temperature-control heat exchanger 31 requires the compressor 1 to increase the frequency, and the indoor dehumidification heat exchanger 32 requires the compressor 1 to decrease the frequency, then the frequency of the compressor 1 can be kept unchanged, the opening of the third throttling element 43 can be adjusted, and part of the cold energy can be transferred to the flow path where the indoor temperature-control heat exchanger 31 is located through the intermediate heat exchanger 5. The specific process is as follows: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths, the first path of refrigerant flows into the intermediate heat exchanger 5 through the first throttling element 41, and the second path of refrigerant is throttled by the third throttling element 43, and then flows into the intermediate heat exchanger 5. At this time, the first throttling element 41 remains fully open, and the third throttling element 43 changes from fully open to closed, and the two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the second throttling element 42 (appropriately adjusting the opening of the electronic expansion valve), and then flows into the indoor temperature-regulating heat exchanger 31. After absorbing heat in the indoor temperature-regulating heat exchanger 31, it enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor dehumidification heat exchanger 32 through the fourth throttling element 44 (appropriately adjusting the opening of the electronic expansion valve), and then enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression after absorbing heat in the indoor dehumidification heat exchanger 32, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0066] Working condition six: if the indoor temperature-control heat exchanger 31 requires the compressor 1 to increase its frequency, and the indoor dehumidification heat exchanger 32 requires the compressor 1 to remain unchanged in frequency, then the frequency of the compressor 1 can be appropriately increased, the opening of the third throttling element 43 can be adjusted, and part of the cold energy can be transferred to the flow path where the indoor temperature-control heat exchanger 31 is located through the intermediate heat exchanger 5. The specific process is as follows: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths. The first path of refrigerant flows into the intermediate heat exchanger 5 through the first throttling element 41, and the second path of refrigerant is throttled by the third throttling element 43, and then flows into the intermediate heat exchanger 5. At this time, the first throttling element 41 remains fully open, and the third throttling element 43 changes from fully open to closed, and the two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the second throttling element 42 (appropriately adjusting the opening of the electronic expansion valve), and then flows into the indoor temperature-regulating heat exchanger 31. After absorbing heat in the indoor temperature-regulating heat exchanger 31, it enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor dehumidification heat exchanger 32 through the fourth throttling element 44 (appropriately adjusting the opening of the electronic expansion valve), and then enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression after absorbing heat in the indoor dehumidification heat exchanger 32, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0067] Working condition seven: If the indoor temperature-control heat exchanger 31 requires the compressor 1 frequency to remain unchanged, and the indoor dehumidification heat exchanger 32 requires the compressor 1 frequency to be reduced, then the compressor 1 frequency can be appropriately reduced, the opening of the third throttling element 43 can be adjusted, and part of the cold energy can be transferred to the flow path where the indoor temperature-control heat exchanger 31 is located through the intermediate heat exchanger 5. The specific process is: the refrigerant flowing out of the exhaust port of the compressor 1 flows to the outdoor heat exchanger 2 through the four-way reversing valve 6, releases heat in the outdoor heat exchanger 2, and then the refrigerant is divided into two paths. The first path of refrigerant flows into the intermediate heat exchanger 5 through the first throttling element 41, and the second path of refrigerant is throttled by the third throttling element 43, and then flows into the intermediate heat exchanger 5. At this time, the first throttling element 41 remains fully open, and the third throttling element 43 changes from fully open to closed, and the two paths of refrigerant exchange heat in the intermediate heat exchanger 5. The first refrigerant flowing out of the intermediate heat exchanger 5 is throttled by the second throttling element 42 (appropriately adjusting the opening of the electronic expansion valve), and then flows into the indoor temperature-regulating heat exchanger 31. After absorbing heat in the indoor temperature-regulating heat exchanger 31, it enters the first cylinder 11 of the compressor 1 through the four-way reversing valve 6 for compression, and then is discharged from the exhaust port for the next cycle. The second refrigerant flowing out of the intermediate heat exchanger 5 flows into the indoor dehumidification heat exchanger 32 through the fourth throttling element 44 (appropriately adjusting the opening of the electronic expansion valve), and then enters the second cylinder 12 of the compressor 1 through the first solenoid valve 71 for compression after absorbing heat in the indoor dehumidification heat exchanger 32, and then is discharged from the exhaust port for the next cycle. At this time, the second solenoid valve 72 and the third solenoid valve 73 are closed.

[0068] (II) In heating mode:

[0069] See also Figure 3 As shown, the specific process is as follows:

[0070] The indoor temperature-regulating heat exchanger 31 and the indoor dehumidifying heat exchanger 32 are both heating, and no heat regulation is required. At this time, the first throttling element 41, the third throttling element 43, and the intermediate heat exchanger 5 do not play a regulating role. The specific circulation process of the system is as follows: the refrigerant flowing out of the exhaust port of the compressor 1 flows out through the four-way reversing valve 6 and is divided into two paths. The first path of refrigerant flows into the indoor temperature-regulating heat exchanger 31, releases heat in the indoor temperature-regulating heat exchanger 31, and then is throttled by the second throttling element 42 (appropriately adjust the opening of the electronic expansion valve). After throttling, the refrigerant flows through the intermediate heat exchanger 5 and the first throttling element 41 (keep fully open) to flow into the outdoor heat exchanger 2. The second path of refrigerant flows into the indoor dehumidifying heat exchanger 32 through the second solenoid valve 72, releases heat in the indoor dehumidifying heat exchanger 32, and then is throttled by the fourth throttling element 44 (appropriately adjust the opening of the electronic expansion valve), and then flows into the outdoor heat exchanger 2 through the intermediate heat exchanger 5 and the third throttling element 43 (keep fully open) after throttling. The two refrigerants are mixed and absorb heat in the outdoor heat exchanger 2. After absorbing heat, the refrigerant flows through the four-way reversing valve 6 and is then divided into two paths. The first refrigerant flows into the first cylinder 11 of the compressor 1 for compression and then is discharged from the exhaust port for the next cycle. The second refrigerant flows into the second cylinder 12 of the compressor 1 through the third solenoid valve 73 for compression and then is discharged from the exhaust port for the next cycle. At this time, the first solenoid valve 71 is closed.

[0071] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A heat pump system, comprising a compressor (1), an outdoor heat exchanger (2), an indoor temperature regulating heat exchanger (31), and an indoor dehumidification heat exchanger (32), characterized in that: When the heat pump system is in cooling mode, the refrigerant output side of the outdoor heat exchanger (2) is connected to the indoor temperature regulating heat exchanger (31) through a first pipeline and to the indoor dehumidification heat exchanger (32) through a second pipeline. A first throttling element (41) and a second throttling element (42) are sequentially arranged along the refrigerant flow direction on the first pipeline, and a third throttling element (43) and a fourth throttling element (44) are sequentially arranged along the refrigerant flow direction on the second pipeline. A heat exchanger can be formed between the first pipeline and the second pipeline at the intermediate heat exchanger (5). The intermediate heat exchanger (5) is located between the first throttling element (41) and the second throttling element (42) and between the third throttling element (43) and the fourth throttling element (44); the indoor temperature control heat exchanger (31) is capable of independently adjusting the temperature of the airflow in the preset space or introduced, and the indoor dehumidification heat exchanger (32) is capable of independently removing the humidity of the airflow in the preset space or introduced; the compressor (1) is a double-intake and single-exhaust twin-cylinder compressor, and the twin-cylinder compressor comprises a first air inlet and a second air inlet. The invention relates to a double-cylinder compressor (11) and a second cylinder (12) having a second air intake port; the four-way reversing valve (6) has a first port, a second port, a third port and a fourth port, the exhaust port of the double-cylinder compressor (1) is connected to the first port, the second port is connected to the indoor temperature-adjusting heat exchanger (31), the third port is connected to the first air intake port, and the fourth port is connected to the outdoor heat exchanger (2); the indoor dehumidification heat exchanger (32) is connected to the second air intake port via a third pipeline, and the third pipeline is provided with a first solenoid valve (71); the indoor temperature-regulating heat exchanger (31) and the second port are connected via a fourth pipeline, a fifth pipeline is provided between the fourth pipeline and the third pipeline, a second solenoid valve (72) is provided on the fifth pipeline, one end of the fifth pipeline is connected to the third pipeline between the first solenoid valve (71) and the indoor dehumidification heat exchanger (32), and the third port is connected to the first air intake port via a sixth pipeline, and the sixth pipeline and the third pipeline are selectively connected via a third solenoid valve (73).

2. The heat pump system according to claim 1, characterized in that: The exhaust gas of the first cylinder (11) and the exhaust gas of the second cylinder (12) are collected at the exhaust port of the twin-cylinder compressor (1), and the exhaust port of the twin-cylinder compressor (1) is connected to the outdoor heat exchanger (2).

3. The heat pump system according to claim 1, characterized in that: The indoor temperature regulating heat exchanger (31) is capable of heat exchange with the water cooling terminal (33).

4. A control method for a heat pump system, characterized in that: A heat pump system for controlling any one of claims 1 to 3, comprising: Get the operation mode of the heat pump system; When the acquired operation mode is cooling mode; Determining the heat exchange requirements of the indoor temperature regulating heat exchanger (31) and the indoor dehumidification heat exchanger (32); According to the heat exchange requirements of the indoor temperature control heat exchanger (31) and the indoor dehumidification heat exchanger (32), it is determined whether to adjust the operating frequency of the dual-cylinder compressor (1) and the opening degrees of the first throttling element (41) and the third throttling element (43) and make corresponding adjustments.

5. The control method according to claim 4, characterized in that: Determining whether to adjust the operating frequency of the dual-cylinder compressor (1) and the openings of the first throttling element (41) and the third throttling element (43) according to the heat exchange requirements of the indoor temperature control heat exchanger (31) and the indoor dehumidification heat exchanger (32) and making corresponding adjustments includes: When the heat exchange requirements of the indoor temperature regulating heat exchanger (31) and the indoor dehumidification heat exchanger (32) both increase, the first throttling element (41) and the third throttling element (43) are controlled to be fully opened, and the operating frequency of the compressor (1) is increased; or, When the heat exchange requirements of the indoor temperature regulating heat exchanger (31) and the indoor dehumidification heat exchanger (32) are both reduced, the first throttling element (41) and the third throttling element (43) are controlled to be fully opened, and the operating frequency of the compressor (1) is reduced; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) decreases and the heat exchange demand of the indoor dehumidification heat exchanger (32) increases, the opening degree of the first throttling element (41) is controlled to decrease, the third throttling element (43) is kept fully open, and the operating frequency of the compressor (1) is kept unchanged; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger (32) increases, the opening degree of the first throttling element (41) is controlled to decrease, the third throttling element (43) is kept fully open, and the operating frequency of the compressor (1) is increased; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) decreases and the heat exchange demand of the indoor dehumidification heat exchanger (32) remains unchanged, the opening degree of the first throttling element (41) is controlled to decrease, the third throttling element (43) is kept fully open, and the operating frequency of the compressor (1) is reduced; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) increases and the heat exchange demand of the indoor dehumidification heat exchanger (32) decreases, the opening degree of the third throttling element (43) is controlled to decrease, the first throttling element (41) is kept fully open, and the operating frequency of the compressor (1) is kept unchanged; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) increases and the heat exchange demand of the indoor dehumidification heat exchanger (32) remains unchanged, the opening degree of the third throttling element (43) is controlled to decrease, the first throttling element (41) is kept fully open, and the operating frequency of the compressor (1) is increased; or, When the heat exchange demand of the indoor temperature regulating heat exchanger (31) remains unchanged and the heat exchange demand of the indoor dehumidification heat exchanger (32) decreases, the opening degree of the third throttling element (43) is controlled to decrease, the first throttling element (41) is kept fully open, and the operating frequency of the compressor (1) is reduced.

6. The control method according to claim 4, characterized in that: When the heat pump system comprises a first solenoid valve (71), a second solenoid valve (72), a third solenoid valve (73) and a four-way reversing valve (6), the control method further comprises: When the acquired operation mode is the cooling mode, the first port of the four-way reversing valve (6) is controlled to be connected to the fourth port and the second port to be connected to the third port, the first solenoid valve (71) is controlled to be turned on and the second solenoid valve (72) and the third solenoid valve (73) are controlled to be turned off; or, When the acquired operation mode is the heating mode, the first port of the four-way reversing valve (6) is controlled to be connected to the second port and the third port to be connected to the fourth port, the first solenoid valve (71) is controlled to be cut off, and the second solenoid valve (72) and the third solenoid valve (73) are controlled to be connected.

7. The control method according to claim 6, characterized in that: When the acquired operating mode is the heating mode, the first throttling element (41) and the third throttling element (43) are also controlled to be fully opened.

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