Heat pump system and air conditioner

Abstract

The heat pump system comprises a first heat exchanger, first mechanisms, an expansion valve and a gas-liquid separator, the first heat exchanger is provided with a first pipeline and a second pipeline, the multiple first mechanisms are arranged between the first pipeline and the second pipeline in parallel, and each first mechanism comprises a compressor, a four-way valve and a second heat exchanger; the compressor is communicated with the second heat exchangers and the first pipeline through the four-way valve, the second heat exchangers are communicated with the second pipeline, the expansion valves and the gas-liquid separators are arranged on the second pipeline, the gas outlets of the gas-liquid separators are communicated with the first mechanisms respectively, the second heat exchangers are connected with the expansion valves in series, and the expansion valves are connected with the second heat exchangers in series. At least two expansion valves in the multiple expansion valves connected with the multiple second heat exchangers in series are different in opening degree, so that the heat exchange temperatures of the at least two second heat exchangers are different. According to the heat pump system and the air conditioner, the problem that in the prior art, an air conditioner is poor in heat pump system efficiency is solved.

Description

Technical Field

[0001] This invention relates to the technical field of air conditioning equipment, and more specifically, to a heat pump system and an air conditioner. Background Technology

[0002] Existing air conditioning and heat pump system technologies primarily rely on single-stage compression cycles or traditional multi-stage compression technology. Single-stage compression cycle systems experience a significant decrease in coefficient of performance (COP) when handling varying ambient temperatures, especially under low evaporation temperatures, leading to increased energy consumption and higher operating costs. This is because in a single-stage compression cycle, as the refrigerant absorbs heat and evaporates in the evaporator, its specific enthalpy increases with decreasing evaporation temperature, resulting in a higher compression ratio in the compressor. Consequently, compressor power consumption increases, and efficiency decreases.

[0003] While multi-stage compression technology can alleviate the aforementioned problems to some extent by reducing the compression ratio and improving system energy efficiency through staged compression, traditional multi-stage compression systems still have limitations in practical applications. For example, the large temperature difference between the interstage heat exchangers and the environment leads to low heat exchange efficiency; high compressor discharge temperature affects compressor lifespan and system stability; and the system cannot flexibly adapt to different load demands, especially under extreme temperature conditions, where irreversible heat exchange losses increase, affecting the overall performance and energy efficiency of the system.

[0004] Furthermore, existing heat pump systems suffer significant impacts on energy efficiency and stability when operating across large temperature ranges, such as providing indoor heating in winter or efficient cooling in summer. This is because traditional heat pump systems cannot effectively control refrigerant flow and evaporation pressure when dealing with extreme temperature changes, leading to decreased heat exchange efficiency and limited system performance.

[0005] As can be seen from the above, the existing air conditioning technology suffers from the problem of poor efficiency of the heat pump system. Summary of the Invention

[0006] The main objective of this invention is to provide a heat pump system and an air conditioner to solve the problem of poor efficiency of heat pump systems in existing air conditioners.

[0007] To achieve the above objectives, according to one aspect of the present invention, a heat pump system is provided. The heat pump system includes a first heat exchanger, a first mechanism, an expansion valve, and a gas-liquid separator. The first heat exchanger has a first pipe connected to a first end of the first heat exchanger and a second pipe connected to a second end of the first heat exchanger. Multiple first mechanisms are provided, connected in parallel between the first and second pipes. Each first mechanism includes a compressor, a four-way valve, and a second heat exchanger. The compressor is connected to the second heat exchanger and the first pipe via the four-way valve. The second heat exchanger is connected to the second pipe. An expansion valve and a gas-liquid separator are provided on the second pipe. Multiple gas-liquid separators and expansion valves are provided. An expansion valve is provided upstream of each gas-liquid separator. The outlets of the multiple gas-liquid separators are respectively connected to the multiple first mechanisms. Each second heat exchanger is connected in series with an expansion valve. At least two of the multiple expansion valves connected in series with the multiple second heat exchangers have different opening degrees, so that the heat exchange temperatures of the at least two second heat exchangers are different.

[0008] Furthermore, the gas-liquid separator corresponds one-to-one with the first mechanism, and the compressor is a quasi-two-stage compressor with an intermediate gas inlet. The outlet of the gas-liquid separator is connected to the intermediate gas inlet of the compressor.

[0009] Furthermore, the first mechanism includes a third pipeline, and the compressor includes a first cylinder and a second cylinder arranged in parallel. The first cylinder and the second cylinder are connected to the four-way valve through the third pipeline, wherein the volume of the first cylinder is greater than the volume of the second cylinder, and the outlet of the gas-liquid separator is connected to the air supply port of the second cylinder.

[0010] Furthermore, the air inlet of the first cylinder and the air inlet of the second cylinder of the same compressor are respectively connected to the air outlets of the two gas-liquid separators.

[0011] Furthermore, at least one of the first mechanisms includes a first cylinder and a second cylinder, the volume of the first cylinder being greater than the volume of the second cylinder, and the air inlet of the second cylinder and / or the second cylinder being connected to the air outlet of the gas-liquid separator; at least another compressor is a quasi-two-stage compressor with an intermediate air inlet, and the air outlet of the gas-liquid separator is connected to the intermediate air inlet of the compressor.

[0012] Furthermore, the second pipeline has a first pipeline section shared by multiple first mechanisms, and multiple gas-liquid separators are installed on the first pipeline section.

[0013] Furthermore, expansion valves are provided at both ends of the gas-liquid separator; and / or the second pipeline also has a second pipeline section located between the second heat exchangers of two adjacent first mechanisms, and an expansion valve is provided on each second pipeline section.

[0014] Furthermore, the opening degrees of the multiple expansion valves connected in series with the multiple second heat exchangers are all different, and the heat exchange temperatures of the multiple second heat exchangers of the first mechanism are all different.

[0015] Furthermore, a second pipeline is configured as one, and multiple first mechanisms are connected to the second end of the first heat exchanger through the same second pipeline.

[0016] Furthermore, multiple second pipelines are provided, and each of the multiple second pipelines corresponds to a multiple first mechanism. Each of the multiple first mechanisms is connected to the second end of the first heat exchanger through a second pipeline. Each second pipeline is equipped with a gas-liquid separator, and the first mechanism connected in series with the second pipeline is connected to the gas outlet of the gas-liquid separator.

[0017] Furthermore, each of the gas-liquid separators on the second pipeline is provided with an expansion valve between itself and the first heat exchanger and the second heat exchanger; and / or the outlet of the gas-liquid separator is connected to the gas supply port of the compressor through a gas connecting pipe, or the outlet of the gas-liquid separator is connected to the third pipeline between the compressor and the four-way valve through a gas connecting pipe, and a gas driving component is provided on the gas connecting pipe.

[0018] Furthermore, the first pipeline is provided in a one-to-one correspondence with the first heat exchanger, and there is one first pipeline; or there are multiple first pipelines provided and each corresponding to one of the first mechanisms, and the multiple first mechanisms are respectively connected to different first heat exchangers through the first pipelines.

[0019] According to another aspect of the present invention, an air conditioner is provided, which includes the heat pump system described above.

[0020] According to the technical solution of this invention, the heat pump system includes a first heat exchanger, a first mechanism, an expansion valve, and a gas-liquid separator. The first heat exchanger has a first pipe connected to a first end of the first heat exchanger and a second pipe connected to a second end of the first heat exchanger. Multiple first mechanisms are provided, and multiple first mechanisms are connected in parallel between the first pipe and the second pipe. Each first mechanism includes a compressor, a four-way valve, and a second heat exchanger. The compressor is connected to the second heat exchanger and the first pipe through the four-way valve. The second heat exchanger is connected to the second pipe. An expansion valve and a gas-liquid separator are provided on the second pipe. Multiple gas-liquid separators and multiple expansion valves are provided. An expansion valve is provided upstream of each gas-liquid separator. The outlets of multiple gas-liquid separators are respectively connected to multiple first mechanisms. Each second heat exchanger is connected in series with an expansion valve. At least two of the multiple expansion valves connected in series with the multiple second heat exchangers have different opening degrees, so that the heat exchange temperatures of at least two second heat exchangers are different.

[0021] As can be seen from the above, this application employs multiple parallel first mechanisms in conjunction with multiple gas-liquid separators and multiple expansion valves, so that the liquid after throttling by the expansion valve flows to the heat exchanger after passing through the gas-liquid separator, ensuring that the liquid flowing to the heat exchanger is in a near-saturated state, thereby significantly reducing the evaporator inlet specific enthalpy, increasing the refrigerant's cooling capacity per unit mass, and improving the system's energy efficiency; the multiple gas-liquid separators and multiple expansion valves form a multi-stage intermediate pressure gradient, effectively reducing the compressor's power consumption, thereby achieving further improvement in energy efficiency.

[0022] The heat pump system of this application employs multiple parallel first mechanisms to form multiple second heat exchangers with different temperatures. The arrangement of second heat exchangers with different temperatures reduces the temperature difference between each heat exchanger and the environment, significantly improving heat exchange efficiency. This allows the system to adapt to different ambient temperature requirements and improves the utilization rate of the heat pump system.

[0023] This application employs a structure with multiple first mechanisms, each of which includes a compressor and a four-way valve. The compressor can be connected to the first and second heat exchangers via the four-way valve. By switching the flow path of the compressor and the four-way valve, the flow direction of the liquid in the flow path is adjusted, thereby achieving the switching between cooling and heating. The parallel structure of multiple first mechanisms adopted in this application further optimizes the energy efficiency of cooling and heating, significantly improves the operating performance of the heat pump system under extreme conditions, and meets a wider range of capacity requirements. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram of one of the heat pump systems of the present invention is shown, illustrating a refrigeration cycle.

[0026] Figure 2 It shows Figure 1 Pressure-enthalpy diagram;

[0027] Figure 3 Another schematic diagram of the heat pump system of the present invention is shown, illustrating a heating cycle diagram;

[0028] Figure 4 Another schematic diagram of the heat pump system of the present invention is shown, wherein the first mechanism is provided in multiple ways;

[0029] Figure 5 Another schematic diagram of the heat pump system of the present invention is shown, wherein multiple first mechanisms and multiple first heat exchangers are provided;

[0030] Figure 6Another schematic diagram of the heat pump system of the present invention is shown, wherein the compressor is a parallel compressor;

[0031] Figure 7 Another schematic diagram of the heat pump system of the present invention is shown, wherein the first mechanism is provided in multiple ways;

[0032] Figure 8 Another schematic diagram of the heat pump system of the present invention is shown, wherein multiple second pipes are provided;

[0033] Figure 9 It shows Figure 8 Pressure-enthalpy diagram.

[0034] The above figures include the following reference numerals:

[0035] 110. First heat exchanger; 120. Compressor; 121. First cylinder; 122. Second cylinder; 130. Four-way valve; 140. Second heat exchanger; 150. Expansion valve; 160. Gas-liquid separator. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0039] To address the problem of poor efficiency of heat pump systems in existing air conditioners, this invention provides an air conditioner that includes a heat pump system, which forms both a cooling cycle and a heating cycle.

[0040] Specifically, the heat pump system of this application can switch between the cooling cycle and the heating cycle through a four-way valve, so that the air conditioner can cool and heat through the heat pump system.

[0041] like Figures 1 to 8As shown, the heat pump system includes a first heat exchanger 110, a first mechanism, an expansion valve 150, and a gas-liquid separator 160. The first heat exchanger 110 has a first pipe connected to a first end of the first heat exchanger 110 and a second pipe connected to a second end of the first heat exchanger 110. The first mechanism is disposed between the first pipe and the second pipe. The expansion valve 150 and the gas-liquid separator 160 are disposed on the second pipe for throttling and depressurizing the liquid in the pipe and for gas-liquid separation.

[0042] Specifically, each of the first mechanisms includes a compressor 120, a four-way valve 130, and a second heat exchanger 140. The compressor 120 is connected to the second heat exchanger 140 and the first pipeline through the four-way valve 130, and the second heat exchanger 140 is connected to the second pipeline. Among them, the first heat exchanger 110 is an outdoor heat exchanger, and the second heat exchanger 140 is an indoor heat exchanger.

[0043] In this embodiment, multiple first mechanisms are provided, each connected to a first pipeline. These multiple first mechanisms are arranged in parallel between the first and second pipelines, forming a structure where multiple first mechanisms operate in parallel. These multiple first mechanisms cooperate with an expansion valve 150 and a gas-liquid separator 160 on the second pipeline. The purpose of the gas-liquid separator 160 is to separate the two phases of refrigerant. The liquid phase enters the next stage heat exchanger for heat exchange, improving the heat exchanger's efficiency, while the gas phase enters the compressor for compression, which helps reduce the exhaust temperature. Specifically, the liquid after being throttled by the expansion valve 150 flows to the heat exchanger after passing through the gas-liquid separator 160. The liquid flowing through the gas-liquid separator 160 is separated into saturated liquid and saturated gas. The saturated gas is supplied to the first mechanism, while the saturated liquid flows to the second heat exchanger 140 to ensure that the liquid flowing to the heat exchanger is in a near-saturated state, thereby significantly reducing the evaporator inlet specific enthalpy, improving the refrigerant's cooling capacity per unit mass, and increasing the system's energy efficiency.

[0044] In this embodiment, multiple gas-liquid separators 160 and expansion valves 150 are provided. An expansion valve 150 is provided upstream of each gas-liquid separator 160. This application uses multiple parallel first mechanisms in conjunction with multiple gas-liquid separators 160 and multiple expansion valves 150. The outlets of multiple gas-liquid separators 160 are respectively connected to multiple first mechanisms to supply the saturated gas formed by the gas-liquid separators 160 to the first mechanisms to improve the compression efficiency of the first mechanisms. Multiple gas-liquid separators 160 and multiple expansion valves 150 form a multi-stage intermediate pressure gradient, which effectively reduces the power consumption of the compressor 120, thereby achieving further improvement in energy efficiency.

[0045] The upstream direction is based on the flow path, meaning the liquid in the flow path first passes through the expansion valve 150 and then flows to the gas-liquid separator 160.

[0046] In this embodiment, since the liquid flow direction inside the second pipeline is different during cooling and heating, expansion valves 150 are provided at both ends of the gas-liquid separator 160 of this application to ensure that the liquid expands and flows to the gas-liquid separator 160 regardless of whether it is a cooling cycle or a heating cycle.

[0047] like Figure 1 , Figures 3 to 8 As shown, the first mechanism arranged in parallel has multiple second heat exchangers 140, and each second heat exchanger 140 is connected in series with an expansion valve 150. The expansion valve 150 is used to control the liquid flow rate and thus control the heat exchange temperature of the second heat exchanger 140.

[0048] Specifically, at least two of the expansion valves 150 connected in series with the plurality of second heat exchangers 140 have different opening degrees, so that the heat exchange temperatures of the at least two second heat exchangers 140 are different.

[0049] The heat pump system of this application employs multiple parallel first mechanisms to form multiple second heat exchangers 140 with different temperatures. The arrangement of second heat exchangers 140 with different temperatures reduces the temperature difference between each heat exchanger and the environment, reduces irreversible losses, and significantly improves heat exchange efficiency. This enables the system to adapt to different ambient temperature requirements and improves the utilization rate of the heat pump system.

[0050] In this embodiment, each of the first mechanisms is equipped with a four-way valve 130. The four ports of the four-way valve 130 are respectively connected to the inlet of the compressor 120, the outlet of the compressor 120, the first heat exchanger 110, and the second heat exchanger 140. By adjusting the four-way valve 130, the direction of the liquid inside the flow path can be adjusted. This application adopts a structure with multiple first mechanisms. By switching the flow path of the compressor 120 and the four-way valve 130, the flow direction of the liquid in the flow path is adjusted, realizing the switching between cooling and heating. The parallel structure of multiple first mechanisms adopted in this application further optimizes the energy efficiency of cooling and heating, significantly improves the operating performance of the heat pump system under extreme conditions, and meets a wider range of capacity requirements.

[0051] Specifically, the third pipeline is located at the outlet of the compressor 120 and the first connection port of the four-way valve 130. The first mechanism also includes a fourth pipeline, a fifth pipeline and a sixth pipeline. The fourth pipeline is connected between the second connection port of the four-way valve 130 and the first pipeline. The fifth pipeline is connected between the third connection port of the four-way valve 130 and the second heat exchanger 140. The sixth pipeline is connected between the four-way valve 130 and the inlet of the compressor 120.

[0052] In the refrigeration cycle of this embodiment, the compressors 120 of multiple first mechanisms provide driving force for the liquid, so that the liquid at the outlet of the compressor 120 flows to the first heat exchanger 110 through the four-way valve 130. The liquid in the first heat exchanger 110 flows through the expansion valve 150 and the gas-liquid separator 160 and then flows to the second heat exchangers 140 of different first mechanisms. After heat exchange in the second heat exchanger 140, the liquid flows to the inlet of the compressor 120 through the four-way valve 130 to achieve circulation.

[0053] The liquid sequentially passes through the outlet of compressor 120, the third pipeline, the four-way valve 130, the fourth pipeline, the first pipeline, the first heat exchanger 110, the expansion valve 150, the gas-liquid separator 160, the second heat exchanger 140, the fifth pipeline, the four-way valve 130, and the sixth pipeline before returning to compressor 120 to form a cycle.

[0054] In the heating cycle of this embodiment, under the control of the four-way valve 130, the liquid flow direction is different from that of the refrigeration cycle. The compressors 120 of the multiple first mechanisms provide driving force for the liquid so that the liquid at the outlet of the compressor 120 flows to the second heat exchanger 140 through the four-way valve 130. The liquid flowing through the multiple second heat exchangers 140 flows through the expansion valve 150 and the gas-liquid separator 160 in sequence and then flows to the first heat exchanger 110. After flowing through the first heat exchanger 110, it flows to the inlet of the compressor 120 through the four-way valve 130 to achieve a circulating flow.

[0055] The liquid sequentially passes through the outlet of compressor 120, the third pipeline, the four-way valve 130, the fifth pipeline, the second heat exchanger 140, the expansion valve 150 and the gas-liquid separator 160, the first heat exchanger, the first pipeline, the fourth pipeline, the four-way valve 130 and the sixth pipeline before returning to compressor 120 to form a cycle.

[0056] like Figure 1 , Figures 3 to 7 As shown, the second pipeline has a first pipeline section and at least one second pipeline section. The first pipeline section is a pipeline section shared by multiple first mechanisms, and multiple gas-liquid separators 160 are disposed on the first pipeline section.

[0057] The shared pipeline section refers to the section through which liquids flowing through multiple first mechanisms all flow, and the multiple first mechanisms are connected to the first pipeline section to form a flow path circulation.

[0058] This application arranges multiple gas-liquid separators 160 on the first pipeline section to ensure that the multiple gas-liquid separators 160 sequentially separate the liquid into gas and liquid, thereby ensuring that the liquid flowing to the second heat exchanger 140 is saturated liquid, thereby improving the heat exchange efficiency of the heat exchanger. At the same time, the gas separated by each gas-liquid separator 160 can be used to replenish the first mechanism, thereby improving the compression efficiency.

[0059] In this embodiment, the second pipeline section is disposed between the second heat exchangers 140 of two adjacent first mechanisms, so that the two adjacent heat exchangers are connected in parallel to the second pipeline. Each second pipeline section is provided with an expansion valve 150. The expansion valve 150 is used to control the heat exchange temperature of the second heat exchanger 140 by adjusting its opening degree. The expansion valve 150 on the second pipeline is an expansion valve 150 connected in series with the second heat exchanger 140.

[0060] Among them, the expansion valve 150 adjacent to the expansion valve 150 on the first pipeline section and the second pipeline section is also an expansion valve 150 connected in series with the second heat exchanger 140; the adjacent first mechanism is two adjacent first mechanisms among a plurality of first mechanisms arranged in parallel.

[0061] In one embodiment, the opening degrees of the multiple expansion valves 150 connected in series with the multiple second heat exchangers 140 are all different, and the heat exchange temperatures of the multiple second heat exchangers 140 of the first mechanism are all different.

[0062] Specifically, by adjusting the number of steps of the expansion valve 150, multiple expansion valves 150 can be made to have different opening degrees, so that the heat exchange temperature of multiple second heat exchangers 140 is different. In this way, the second heat exchangers 140 reduce the multiple heat exchange temperature differences with the ambient temperature, forming a successive heat exchange effect, which is beneficial to improving heat exchange efficiency.

[0063] In this embodiment, by adjusting the expansion valve 150 to make the heat exchange temperature difference of two adjacent second heat exchangers 140 the same, the multiple second heat exchangers 140 are used to form a stable gradient heat exchange.

[0064] In another embodiment, the opening portions of the plurality of expansion valves 150 connected in series with the plurality of second heat exchangers 140 are the same but not the same, so as to form a plurality of second heat exchangers 140 with a plurality of heat exchange temperatures, that is, a portion of the second heat exchangers 140 have the same heat exchange temperature, and all the second heat exchangers 140 have different heat exchange temperatures.

[0065] In this embodiment, depending on the compression technology used, the compressor 120 of this application may be a quasi-two-stage compressor 120 using quasi-two-stage compression, or a parallel compressor 120 using parallel compression technology, or a combination of a quasi-two-stage compressor 120 and a parallel compressor 120.

[0066] In such Figures 1 to 5 In the embodiment shown, the compressor 120 is a quasi-two-stage compressor 120. The outlet of the compressor 120 is connected to the four-way valve 130 through a third pipeline. The outlet of the compressor 120 outputs a gas-liquid mixture. The compressor 120 has an intermediate gas supply port. The gas-liquid separator 160 corresponds one-to-one with the first mechanism. The outlet of the gas-liquid separator 160 is connected to the intermediate gas supply port of the compressor 120.

[0067] Among them, the gas-liquid separator 160 supplies the separated gas to the compressor 120, thereby improving the compression efficiency of the compressor 120. The gas-liquid separator 160 and the first mechanism are arranged in a one-to-one correspondence, which ensures that the gas-liquid separator 160 and the compressor 120 are arranged in a one-to-one correspondence. In this way, multiple gas-liquid separators 160 can replenish gas to multiple compressors 120.

[0068] In this embodiment, the upstream gas-liquid separator 160 is used to supply gas to the compressor 120 connected in series with the second heat exchanger 140 on the relatively high temperature side.

[0069] Specifically, multiple first mechanisms are provided, and multiple first mechanisms are arranged in parallel between the first pipeline and the second pipeline to form multiple parallel first mechanisms. Gas-liquid separators 160 are arranged in one-to-one correspondence with the first mechanisms, and multiple gas-liquid separators 160 are arranged in series on the second pipeline.

[0070] Among them, multiple first mechanisms form multiple second heat exchangers 140 with different heat exchange temperatures.

[0071] Specifically, the outlet of each gas-liquid separator 160 is connected to the intermediate gas supply port of a corresponding compressor 120 to supply gas to the compressor 120, thereby improving the compression efficiency of the corresponding compressor 120 and thus improving the cycle efficiency.

[0072] The number of the first institutions can be as follows: Figure 1 and Figure 3 The two shown can also be as follows: Figure 4 and Figure 5 The number shown is greater than two.

[0073] In this embodiment, 1, 1', 1'', 2, 2', 2'', 3, 4, 4', 4'', 5, 5', 5'' and 5''' in the pressure-enthalpy diagram are... Figure 1 The value points of the flow path, and the pressure-enthalpy formed at multiple points, such as... Figure 2 As shown.

[0074] In such Figures 6 to 8 In the embodiment shown, the compressor 120 is a parallel compressor 120, which includes a first cylinder 121 and a second cylinder 122 arranged in parallel. The first cylinder 121 and the second cylinder 122 are connected to the four-way valve 130 through the third pipeline.

[0075] The volume of the first cylinder 121 is greater than that of the second cylinder 122. The outlet of the gas-liquid separator 160 is connected to the air supply port of the second cylinder 122, that is, the gas-liquid separator 160 is used to supply air to the smaller cylinder.

[0076] Multiple first mechanisms are set up, and multiple first mechanisms are set up in parallel between the first pipeline and the second pipeline to form multiple parallel first mechanisms. Gas-liquid separators 160 are set up one-to-one with the first mechanisms, and multiple gas-liquid separators 160 are set up in series on the second pipeline.

[0077] Among them, multiple first mechanisms form multiple second heat exchangers 140 with different heat exchange temperatures.

[0078] Specifically, the first mechanism also includes a third pipeline, through which the outlet of the compressor 120 is connected to the four-way valve 130, and the outlet of the gas-liquid separator 160 is connected to the air supply port of the second cylinder 122, thereby improving the circulation efficiency and the performance of the heat pump system.

[0079] In this embodiment, 1, 1', 1'', 1''', 2, 2', 2'', 2''', 3, 4, 4', 4'', 5, 5', 5'' and 5''' in the pressure-enthalpy diagram are... Figure 8 The value points of the flow path, and the pressure-enthalpy formed at multiple points, such as... Figure 9 As shown.

[0080] In this embodiment, as Figure 7 As shown, the air supply ports of the first cylinder 121 and the second cylinder 122 of the same compressor 120 can also be connected to the air outlets of the two gas-liquid separators 160, so that the two gas-liquid separators 160 can simultaneously supply air to the first cylinder 121 and the second cylinder 122, thereby improving the compression efficiency.

[0081] The number of the first institutions can be as follows: Figure 6 and Figure 8 The two shown can also be as follows: Figure 7 The number shown is greater than two.

[0082] In such Figure 7 In the specific embodiment shown, some compressors 120 are parallel compressors 120, and other compressors 120 are quasi-two-stage compressors 120, so as to achieve the effect of using multiple compressors 120 in combination.

[0083] Specifically, at least one of the first mechanisms, the compressor 120, includes a first cylinder 121 and a second cylinder 122, the volume of the first cylinder 121 being larger than the volume of the second cylinder 122, and the air inlet of the second cylinder 122 and / or the second cylinder 122 being connected to the air outlet of the gas-liquid separator 160; at least another compressor 120 is a quasi-two-stage compressor 120 with an intermediate air inlet, and the air outlet of the gas-liquid separator 160 is connected to the intermediate air inlet of the compressor 120.

[0084] like Figures 1 to 7 In the embodiment shown, a second pipeline is provided, and multiple first mechanisms are connected to the second end of the first heat exchanger 110 through the same second pipeline.

[0085] In such Figure 8 In another embodiment shown, multiple second pipelines are provided, and each of the multiple second pipelines corresponds to a multiple first mechanism. The multiple first mechanisms are respectively connected to the second end of the first heat exchanger 110 through the second pipelines. Each second pipeline is provided with a gas-liquid separator 160, and the first mechanism connected in series with the second pipeline is connected to the gas outlet of the gas-liquid separator 160.

[0086] The gas-liquid separator 160, the second heat exchanger 140 and the first mechanism are connected in series, and the gas outlet of the gas-liquid separator 160 is connected to the first mechanism.

[0087] An expansion valve 150 is provided between the gas-liquid separator 160 on each of the second pipelines and the first and second heat exchangers 140, so as to be suitable for refrigeration and heating cycles.

[0088] In this embodiment, the outlet of the gas-liquid separator 160 may be connected to the gas supply port of the compressor 120 through a gas connecting pipe.

[0089] In this embodiment, the outlet of the gas-liquid separator 160 can also be connected to a third pipeline between the compressor 120 and the four-way valve 130 through a gas connecting pipe, and a gas driving component can be provided on the gas connecting pipe.

[0090] In this embodiment, the second pipeline can be configured as follows: Figure 8 The two shown correspond to two first mechanisms; the second pipeline can also be set to more than two, in which case there are more than two first mechanisms.

[0091] In this embodiment, the first conduit can be configured as follows: Figure 1 , Figures 2 to 4 , Figures 6 to 8 One shown can also be set as follows: Figure 5 As shown, multiple first pipelines are provided, each corresponding to a first heat exchanger 110. When there is one first pipeline, there is one corresponding first heat exchanger 110, and multiple first mechanisms are connected to the same first pipeline. When there are multiple first pipelines, and the number of first mechanisms is the same and they are provided in a one-to-one correspondence, the multiple first mechanisms are respectively connected to different first heat exchangers 110 through the first pipelines. The arrangement of multiple first heat exchangers 110 forms multiple heat exchange structures, which helps to improve heat exchange efficiency and improve the performance of air conditioning.

[0092] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0093] This application employs multiple parallel first mechanisms in conjunction with multiple gas-liquid separators 160 and multiple expansion valves 150, so that the liquid throttled by the expansion valves 150 flows to the heat exchanger after passing through the gas-liquid separators 160, ensuring that the liquid flowing to the heat exchanger is in a near-saturated state, thereby significantly reducing the evaporator inlet specific enthalpy, increasing the refrigerant's cooling capacity per unit mass, and improving system energy efficiency; the multiple gas-liquid separators 160 and multiple expansion valves 150 form a multi-stage intermediate pressure gradient, effectively reducing the power consumption of the compressor 120, thereby achieving further improvement in energy efficiency.

[0094] The heat pump system of this application employs multiple parallel first mechanisms to form multiple second heat exchangers 140 with different temperatures. The arrangement of second heat exchangers 140 with different temperatures reduces the temperature difference between each heat exchanger and the environment, significantly improving heat exchange efficiency, thereby adapting to different ambient temperature requirements and improving the utilization rate of the heat pump system.

[0095] This application employs a structure with multiple first mechanisms, each of which includes a compressor 120 and a four-way valve 130. The compressor 120 can be connected to the first heat exchanger 110 and the second heat exchanger 140 via the four-way valve 130. By switching the flow path of the compressor 120 and the four-way valve 130, the flow direction of the liquid in the flow path is adjusted, thereby achieving the switching between cooling and heating. The parallel structure of multiple first mechanisms adopted in this application further optimizes the energy efficiency of cooling and heating, significantly improves the operating performance of the heat pump system under extreme conditions, and meets a wider range of capacity requirements.

[0096] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0097] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0098] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat pump system, characterized in that, include: A first heat exchanger (110) has a first pipe connected to a first end of the first heat exchanger (110) and a second pipe connected to a second end of the first heat exchanger (110). The first mechanism is provided in multiple ways, and the multiple first mechanisms are arranged in parallel between the first pipeline and the second pipeline; Each of the first mechanisms includes a compressor (120), a four-way valve (130), and a second heat exchanger (140). The compressor (120) is connected to the second heat exchanger (140) and the first pipeline through the four-way valve (130), and the second heat exchanger (140) is connected to the second pipeline. An expansion valve (150) and a gas-liquid separator (160) are provided on the second pipeline. Multiple gas-liquid separators (160) and multiple expansion valves (150) are provided. An expansion valve (150) is provided upstream of each gas-liquid separator (160). The outlets of multiple gas-liquid separators (160) are respectively connected to multiple first mechanisms. Each second heat exchanger (140) is connected in series with an expansion valve (150). At least two of the multiple expansion valves (150) connected in series with multiple second heat exchangers (140) have different opening degrees so that the heat exchange temperatures of at least two second heat exchangers (140) are different.

2. The heat pump system according to claim 1, characterized in that, The gas-liquid separator (160) corresponds one-to-one with the first mechanism. The compressor (120) is a quasi-two-stage compressor (120) with an intermediate air supply port. The outlet of the gas-liquid separator (160) is connected to the intermediate air supply port of the compressor (120).

3. The heat pump system according to claim 1, characterized in that, The first mechanism includes a third pipeline, and the compressor (120) includes a first cylinder (121) and a second cylinder (122) arranged in parallel. The first cylinder (121) and the second cylinder (122) are connected to the four-way valve (130) through the third pipeline. The volume of the first cylinder (121) is greater than the volume of the second cylinder (122). The outlet of the gas-liquid separator (160) is connected to the air supply port of the second cylinder (122).

4. The heat pump system according to claim 3, characterized in that, The air inlet of the first cylinder (121) and the air inlet of the second cylinder (122) of the same compressor (120) are respectively connected to the air outlets of the two gas-liquid separators (160).

5. The heat pump system according to claim 1, characterized in that, At least one of the first mechanisms, the compressor (120) includes a first cylinder (121) and a second cylinder (122), the volume of the first cylinder (121) is greater than the volume of the second cylinder (122), and the air inlet of the second cylinder (122) and / or the air outlet of the second cylinder (122) is connected to the air outlet of the gas-liquid separator (160); At least one of the compressors (120) is a quasi-two-stage compressor (120) with an intermediate air supply port, and the outlet of the gas-liquid separator (160) is connected to the intermediate air supply port of the compressor (120).

6. The heat pump system according to claim 1, characterized in that, The second pipeline has a first pipeline section shared by multiple first mechanisms, and multiple gas-liquid separators (160) are disposed on the first pipeline section.

7. The heat pump system according to claim 6, characterized in that, The gas-liquid separator (160) is equipped with expansion valves (150) at both ends; and / or The second pipeline also has a second pipeline section located between two adjacent second heat exchangers (140) of the first mechanism, and each second pipeline section is provided with the expansion valve (150).

8. The heat pump system according to claim 1, characterized in that, The opening degrees of the multiple expansion valves (150) connected in series with the multiple second heat exchangers (140) are all different, and the heat exchange temperatures of the multiple second heat exchangers (140) of the first mechanism are all different.

9. The heat pump system according to any one of claims 1 to 8, characterized in that, The second pipeline is configured as one, and multiple first mechanisms are connected to the second end of the first heat exchanger (110) through the same second pipeline.

10. The heat pump system according to any one of claims 1 to 8, characterized in that, Multiple second pipelines are provided, and multiple second pipelines are provided in one-to-one correspondence with multiple first mechanisms. Multiple first mechanisms are respectively connected to the second end of the first heat exchanger (110) through the second pipelines. Each second pipeline is provided with the gas-liquid separator (160), and the first mechanism connected in series with the second pipeline is connected to the gas outlet of the gas-liquid separator (160).

11. The heat pump system according to claim 10, characterized in that, Each of the gas-liquid separators (160) on the second pipeline is provided with an expansion valve (150) between itself and the first heat exchanger and the second heat exchanger (140); and / or The outlet of the gas-liquid separator (160) is connected to the gas supply port of the compressor (120) through a gas connecting pipe, or the outlet of the gas-liquid separator (160) is connected to the third pipeline between the compressor (120) and the four-way valve (130) through a gas connecting pipe, and a gas driving component is provided on the gas connecting pipe.

12. The heat pump system according to any one of claims 1 to 8, characterized in that, The first pipeline is set up in a one-to-one correspondence with the first heat exchanger (110). The first pipeline has one; or The first pipeline is provided in multiple ways and is provided in one-to-one correspondence with the first mechanism. The multiple first mechanisms are respectively connected to different first heat exchangers (110) through the first pipeline.

13. An air conditioner, characterized in that, The air conditioner includes the heat pump system according to any one of claims 1 to 12.

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