Heat pump system and control method of heat pump system

Abstract

The invention relates to the technical field of heat exchange, particularly provides a heat pump system and a control method of the heat pump system, and aims to solve the problem that a heat exchange scheme of the heat pump system cannot keep high efficiency at an extremely low environment temperature and cannot avoid reduction of the energy efficiency ratio at a relatively high environment temperature or under a refrigeration working condition at the same time. According to the heat pump system, a first conveying pipeline communicates between a heat exchanger and a throttling device, and a second conveying pipeline communicates between the heat exchanger and a compressor; the first conveying pipeline and / or the second conveying pipeline comprise / comprises a plurality of branches arranged in parallel, a control valve is arranged in at least one branch, and series or parallel channels can be formed among the heat exchange pipelines in the heat exchanger by controlling opening and closing of the control valves. According to the heat pump system provided by the invention, the connection state of the heat exchange pipelines in the heat exchanger can be dynamically adjusted according to different working conditions and heat supply requirements, so that the heat exchange pipelines are connected in series or in parallel, and the efficiency and the performance of the system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, and particularly provides a heat pump system and a control method of the heat pump system. BACKGROUND

[0002] As a kind of heat energy regulation technology, heat pump system plays a key role in the industrial field. However, the performance of heat pump system is significantly affected by ambient temperature. In particular, when operating at extremely low ambient temperature, due to the large increase in heating demand, the operating frequency of the compressor of the conventional heat pump system may be close to the limit, which causes a significant increase in the suction flow rate of the compressor, and in turn causes a sharp increase in the flow rate of the refrigerant in the evaporator, while the pressure drop in the evaporator is significantly increased. This condition not only significantly reduces the heat exchange efficiency of the system, but also affects the overall performance and stability of the heat pump system.

[0003] In the related art, two solutions are generally used to solve the above problems: one is to use a large displacement compressor to meet the large heating demand, but this solution has a high cost; the other is to parallelly arrange multiple heat exchange pipelines in the heat exchanger to effectively disperse the flow rate of the refrigerant and reduce the flow rate in a single pipeline, thereby reducing the pressure drop of the heat exchanger. However, in the case of high ambient temperature or in the refrigeration working condition, the system does not require such high heat exchange capacity, and the arrangement of multiple parallel pipelines may cause uneven distribution of refrigerant flow and slow operation, and some pipelines may be in a low-efficiency operating state, thereby reducing the energy efficiency ratio of the system.

[0004] Therefore, there is a need in the art for a new heat exchange scheme for heat pump system to solve the above problems. SUMMARY

[0005] The present application aims to solve the above technical problems, i.e., to solve the problem that the existing heat exchange scheme of heat pump system cannot balance the high efficiency at extremely low ambient temperature and the avoidance of energy efficiency ratio reduction at higher ambient temperature or in refrigeration working condition.

[0006] In a first aspect, the present application provides a heat pump system, comprising a throttling device, a heat exchanger and a compressor, characterized in that a first delivery pipeline is arranged in communication between a first end of the heat exchanger and the throttling device, and a second delivery pipeline is arranged in communication between a second end of the heat exchanger and the compressor.

[0007] Wherein the first delivery pipeline and / or the second delivery pipeline comprises a plurality of parallelly arranged branches, and at least one of the branches is provided with a control valve, so that when the control valve is opened, a plurality of parallel channels are formed between the first delivery pipeline and the second delivery pipeline, and when the control valve is closed, a series of channels are formed between the first delivery pipeline and the second delivery pipeline.

[0008] Optionally, the first conveying pipeline comprises a first branch and a second branch arranged in parallel between the throttling device and the first end, the second branch is further arranged with a third branch and a fourth branch in parallel near the end of the heat exchanger, the third branch and the fourth branch are connected with the throttling device, and the control valve comprises a first control valve arranged on the second branch.

[0009] The second conveying pipeline comprises a fifth branch, a sixth branch and a seventh branch arranged in parallel between the second end and the compressor, the fifth branch is connected in series with the first branch to form a first passage, when the first control valve is opened, the second branch, the third branch and the sixth branch are connected in series to form a second passage, and the second branch, the fourth branch and the seventh branch are connected in series to form a third passage.

[0010] Optionally, the first conveying pipeline comprises a first branch and a second branch arranged in parallel between the throttling device and the first end, the second branch is further arranged with a third branch and a fourth branch in parallel near the end of the heat exchanger, the third branch and the fourth branch are connected with the throttling device, and the control valve comprises a first control valve arranged on the second branch.

[0011] The second conveying pipeline comprises a connecting pipeline connected to the second end, both ends of the connecting pipeline are in communication with the first branch and the third branch respectively, an eighth branch is further connected between the connecting pipeline and the compressor, and the second conveying pipeline further comprises a ninth branch connected between the second end and the compressor, and the control valve further comprises a second control valve arranged on the eighth branch near the end of the connecting pipeline.

[0012] When the first control valve and the second control valve are opened, the first branch, the connecting pipeline and the eighth branch are connected in series to form a fourth passage, the second branch, the third branch, the connecting pipeline and the eighth branch are connected in series to form a fifth passage, and the second branch, the fourth branch and the ninth branch are connected in series to form a sixth passage; or,

[0013] When the first control valve and the second control valve are closed, the first branch, the connecting pipeline, the third branch, the fourth branch, the ninth branch and the eighth branch are connected in series to form a seventh passage.

[0014] Optionally, the heat pump system further comprises:

[0015] A first shunt device, a first shunt port of the first shunt device is connected with the third branch, and a second shunt port of the first shunt device is connected with the fourth branch.

[0016] Optionally, the heat pump system further comprises:

[0017] a second flow dividing device, a converging port of which is connected with the throttling device, a third flow port of the second flow dividing device is connected with the first branch, and a fourth flow port of the second flow dividing device is connected with the second branch, and the first control valve is located between the first flow dividing device and the second flow dividing device.

[0018] Optionally, the heat pump system further comprises:

[0019] a controller, which is electrically connected with the control valve to control opening and closing of the control valve.

[0020] Optionally, the first control valve and the second control valve are both solenoid valves.

[0021] In a second aspect, the present application provides a control method of a heat pump system, the heat pump system comprising a throttling device, a heat exchanger and a compressor, a first conveying pipeline is arranged in communication between a first end of the heat exchanger and the throttling device, and a second conveying pipeline is arranged in communication between a second end of the heat exchanger and the compressor;

[0022] wherein the first conveying pipeline and / or the second conveying pipeline comprises a plurality of branches arranged in parallel, and at least one of the branches is provided with a control valve, so that when the control valve is opened, a plurality of parallel channels are formed between the first conveying pipeline and the second conveying pipeline, and when the control valve is closed, a series channel is formed between the first conveying pipeline and the second conveying pipeline.

[0023] The control method comprises:

[0024] In a state where the heat pump system operates in a heating mode, the control valve is selectively controlled to be opened or closed according to an ambient temperature.

[0025] Optionally, the first conveying pipeline comprises a first branch and a second branch arranged in parallel between the throttling device and the first end, and the second branch is further provided with a third branch and a fourth branch arranged in parallel near an end portion of the heat exchanger, the third branch and the fourth branch are both connected with the throttling device, and the control valve comprises a first control valve arranged on the second branch.

[0026] The second conveying pipeline comprises a fifth branch, a sixth branch and a seventh branch arranged in parallel between the second end and the compressor, the fifth branch is connected in series with the first branch to form a first channel, when the first control valve is opened, the second branch, the third branch and the sixth branch are connected in series to form a second channel, and the second branch, the fourth branch and the seventh branch are connected in series to form a third channel.

[0027] The "selectively controlling the control valve to open or close according to the ambient temperature in the state that the heat pump system operates in the heating mode" comprises:

[0028] In the case that the ambient temperature is less than or equal to a first preset temperature, controlling the first control valve to open;

[0029] In the case that the ambient temperature is greater than the first preset temperature, controlling the first control valve to close.

[0030] Optionally, the first conveying pipeline comprises a first branch and a second branch which are arranged in parallel between the throttling device and the first end, the second branch is arranged in parallel with a third branch and a fourth branch near the end of the heat exchanger, the third branch and the fourth branch are connected with the throttling device, and the control valve comprises a first control valve arranged on the second branch;

[0031] The second conveying pipeline comprises a connecting pipeline connected to the second end, both ends of the connecting pipeline are in communication with the first branch and the third branch, and an eighth branch is connected between the connecting pipeline and the compressor, the second conveying pipeline further comprises a ninth branch connected between the second end and the compressor, and the control valve further comprises a second control valve arranged on the eighth branch near the end of the connecting pipeline;

[0032] When the first control valve and the second control valve are opened, the first branch and the connecting pipeline are connected in series to form a fourth channel, the second branch, the third branch and the connecting pipeline are connected in series to form a fifth channel, the second branch, the fourth branch and the ninth branch are connected in series to form a sixth channel, and the fourth channel, the fifth channel and the sixth channel are connected in series with the eighth branch; or,

[0033] When the first control valve and the second control valve are closed, the first branch, the connecting pipeline, the third branch, the fourth branch, the ninth branch and the eighth branch are connected in series;

[0034] The "selectively controlling the control valve to open or close according to the ambient temperature in the state that the heat pump system operates in the heating mode" further comprises:

[0035] In the case that the ambient temperature is less than or equal to a first preset temperature, controlling the first control valve and the second control valve to open;

[0036] In the case that the ambient temperature is greater than a second preset temperature, controlling the first control valve and the second control valve to close.

[0037] In the technical scheme, the heat pump system can dynamically adjust the connection state of the heat exchange pipelines in the heat exchanger according to different working conditions and requirements. When it is necessary to improve the heat exchange capacity or cope with ultra-low ambient temperature, the control valve is opened to connect the heat exchange pipelines in parallel in the heat exchanger, which not only helps to reduce the pressure drop of the heat exchanger, but also helps to improve the efficiency and performance of the system. When the system needs to operate in the heating mode at a lower ambient temperature or the system operates in the cooling mode, the control valve is closed to reduce the number of the heat exchange pipelines connected in parallel or to connect the heat exchange pipelines in series to improve the flow speed of the refrigerant in the pipelines, thereby improving the efficiency and performance of the system.

[0038] The controllable branch design not only enhances the flexibility and adaptability of the system, but also balances the performance and energy efficiency of the system under different working conditions, ensuring that the system can operate stably and efficiently under various environments. BRIEF DESCRIPTION OF DRAWINGS

[0039] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0040] Figure 1 is a structural schematic diagram of a first embodiment of the heat pump system provided in the present embodiment;

[0041] Figure 2 is a structural schematic diagram of a second embodiment of the heat pump system provided in the present embodiment;

[0042] Figure 3 is a structural schematic diagram of a third embodiment of the heat pump system provided in the present embodiment;

[0043] Figure 4 is a structural schematic diagram of a fourth embodiment of the heat pump system provided in the present embodiment;

[0044] Figure 5 is a structural schematic diagram of a fifth embodiment of the heat pump system provided in the present embodiment;

[0045] Figure 6 is a control method step flow chart of the first embodiment of the heat pump system provided in the present embodiment;

[0046] Figure 7 is a control method step flow chart of the second embodiment of the heat pump system provided in the present embodiment. List of reference signs:

[0047] 1 - throttle device, 2 - compressor, 3 - heat exchanger, 31 - first heat exchange pipeline, 32 - second heat exchange pipeline, 33 - third heat exchange pipeline, 34 - fourth heat exchange pipeline, 35 - fifth heat exchange pipeline, 36 - sixth heat exchange pipeline, 4 - first delivery pipeline, 41 - first branch, 42 - second branch, 43 - third branch, 44 - fourth branch, 45 - tenth branch, 46 - twelfth branch, 47 - fourteenth branch, 5 - second delivery pipeline, 51 - fifth branch, 52 - sixth branch, 53 - seventh branch, 54 - eighth branch, 55 - ninth branch, 56 - eleventh branch, 57 - thirteenth branch, 58 - fifteenth branch, 6 - connecting pipeline, 71 - first control valve, 72 - second control valve, 81 - first flow divider, 82 - second flow divider. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art will understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.

[0049] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The embodiment of the present application provides a heat pump system, and a throttle device 1, a heat exchanger 3 and a compressor 2 are communicated and arranged in a refrigerant circuit of the heat pump system. The heat exchanger 3 is provided with a plurality of heat exchange pipelines in parallel, each heat exchange pipeline has two ends arranged oppositely, i.e. a first end and a second end. The first end and the throttle device 1 are communicated and arranged with a first delivery pipeline 4, and the second end and the compressor 2 are communicated and arranged with a second delivery pipeline 5.

[0052] The first conveying pipeline 4 includes a plurality of branches in parallel, each of which is connected with the first end of a corresponding heat exchange pipeline. The second conveying pipeline 5 includes a plurality of branches in parallel, each of which is connected with the second end of a corresponding heat exchange pipeline.

[0053] Further, at least one of the branches is provided with a control valve, the open and closed state of which can control the connection state of the heat exchange pipeline connected therewith and the refrigerant circuit.

[0054] When the control valve is opened, the heat exchange pipeline connected therewith can communicate with the refrigerant circuit through the branch; when the control valve is closed, the branch is disconnected, the heat exchange pipeline connected therewith communicates with the refrigerant circuit through other heat exchange pipelines, or is disconnected from the refrigerant circuit.

[0055] In this way, the connection state of the heat exchange pipeline connected with the control valve can be controlled by controlling the open and closed state of the control valve, and the connection state between the heat exchange pipelines can be controlled, such as parallel connection or series connection between the heat exchange pipelines.

[0056] Specifically, in the state that the control valve is opened, the plurality of heat exchange pipelines in the heat exchanger 3 are connected in parallel, and the refrigerant can flow through the plurality of heat exchange pipelines at the same time, which can effectively disperse the flow of the refrigerant, reduce the flow rate in a single heat exchange pipeline, and further reduce the pressure drop of the heat exchanger 3. This design can meet the heating demand in an ultra-low temperature environment (for example, below minus 12 degrees Celsius), and ensure that the system can still operate efficiently under extreme conditions.

[0057] In one embodiment, please refer to Figure 1 When the control valve is closed, the heat exchange pipeline connected therewith will be disconnected from the refrigerant circuit. At this time, the first conveying pipeline 4 and the second conveying pipeline 5 are connected in series through other communicating branches to make the refrigerant flow through the heat exchanger 3. Through this design, the number of parallel branches can be reduced, thereby increasing the speed of the refrigerant passing through the heat exchange pipeline to some extent. In particular, when the system operates in a heating mode, the ambient temperature is relatively high (for example, higher than minus 12 degrees Celsius), or the system operates in a cooling mode, this scheme can improve the operating efficiency and performance of the system.

[0058] In one embodiment, please refer to Figure 2 The connection pipeline 6 is connected between at least two heat exchange pipelines. By controlling the corresponding control valve to be closed, the two heat exchange pipelines can be connected in series. This series connection design helps to increase the operating speed of the refrigerant in the pipeline, and in particular, when the system operates in a heating mode at a relatively low ambient temperature (for example, higher than minus 12 degrees Celsius), or the system operates in a cooling mode, this scheme can improve the operating efficiency and performance of the system.

[0059] The heat pump system provided in the embodiments of the present application can dynamically adjust the connection state of the heat exchange pipelines in the heat exchanger 3 according to different working conditions and requirements. When it is necessary to increase the heat exchange capacity or cope with ultra-low ambient temperature, the control valve can be opened to connect multiple heat exchange pipelines in the heat exchanger 3 in parallel, which not only helps to reduce the pressure drop of the heat exchanger 3, but also helps to improve the efficiency and performance of the system. When the system needs to operate in a heating mode at a lower ambient temperature or the system operates in a cooling mode, the control valve can be closed to reduce the number of heat exchange pipelines connected in parallel or to connect the heat exchange pipelines in series to increase the flow rate of the refrigerant in the pipelines, thereby improving the efficiency and performance of the system.

[0060] This controllable branch design not only enhances the flexibility and adaptability of the system, but also balances the performance and energy efficiency of the system under different working conditions, ensuring that it can operate stably and efficiently under various environments.

[0061] In one embodiment, as shown in Figure 1 The first conveying pipeline 4 includes the first branch 41 and the second branch 42 connected in parallel between the throttling device 1 and the first end, and the first control valve 71 is connected in communication on the second branch 42. The third branch 43 and the fourth branch 44 are also connected in parallel near the end of the heat exchanger 3, that is, the third branch 43 and the fourth branch 44 are connected in parallel between the second branch 42 and the first end of the heat exchanger 3. The second conveying pipeline 5 includes the fifth branch 51, the sixth branch 52, and the seventh branch 53 connected in parallel between the second end and the compressor 2.

[0062] When the first control valve 71 is opened, the heat exchange pipelines in the heat exchanger 3 are connected in parallel through the connection between the branches. Specifically, the first branch 41 is connected in series with the fifth branch 51 through the first heat exchange pipeline 31 to form a first channel; the second branch 42 and the third branch 43 are connected in series and then connected in communication with the second heat exchange pipeline 32 and the sixth branch 52 to form a second channel; the second branch 42 and the fourth branch 44 are connected in series and then connected in communication with the third heat exchange pipeline 33 and the seventh branch 53 to form a third channel. The first channel, the second channel, and the third channel are connected in parallel.

[0063] Taking the heating mode in an ultra-low temperature environment (for example, the ambient temperature is higher than minus 12 degrees Celsius) as an example, the refrigerant flows out of the throttling device 1 and enters the compressor 2 through the first channel, the second channel, and the third channel, respectively.

[0064] When the first control valve 71 is closed, the second channel and the third channel are disconnected, and only the first channel is connected in communication. The refrigerant flows out of the throttling device 1 and enters the compressor 2 along the path shown by the arrow in Figure 1 .

[0065] In one embodiment, as shown in Figure 2 The first delivery pipeline 4 includes a first branch 41 and a second branch 42 connected in parallel between the throttling device 1 and the first end, and the second branch 42 is provided with a first control valve 71.

[0066] The second delivery pipeline 5 includes a connecting pipeline 6 connected to the second end. Specifically, the two ends of the connecting pipeline 6 are respectively connected to the first branch 41 through the first heat exchange pipeline 31 and connected to the third branch 43 through the second heat exchange pipeline 32. The connecting pipeline 6 is further connected to the compressor 2 through the eighth branch 54.

[0067] The second delivery pipeline 5 further includes a ninth branch 55 connected between the second end and the compressor 2, and the ninth branch 55 is connected to the fourth branch 44 through the third heat exchange pipeline 33.

[0068] Further, the eighth branch 54 is further provided with a second control valve 72, and the second control valve 72 is located between the connecting end of the eighth branch 54 and the connecting pipeline 6 and the connecting end of the eighth branch 54 and the ninth branch 55.

[0069] When the first control valve 71 and the second control valve 72 are opened, the first branch 41, the first heat exchange pipeline 31, the connecting pipeline 6 and the eighth branch 54 are connected in series to form a fourth channel, the second branch 42, the third branch 43, the second heat exchange pipeline 32, the connecting pipeline 6 and the eighth branch 54 are connected in series to form a fifth channel, and the second branch 42, the fourth branch 44, the third heat exchange pipeline 33 and the ninth branch 55 are connected in series to form a sixth channel. In this way, the refrigerant flows out of the throttling device 1 and enters the compressor 2 through the fourth channel, the fifth channel and the sixth channel respectively.

[0070] When the first control valve 71 and the second control valve 72 are closed, the first branch 41, the first heat exchange pipeline 31, the connecting pipeline 6, the second heat exchange pipeline 32, the third branch 43, the fourth branch 44, the third heat exchange pipeline 33, the ninth branch 55 and the eighth branch 54 are connected in series to form a seventh channel. The refrigerant flows out of the throttling device 1 and enters the compressor 2 along the seventh channel (as shown by the arrow in Figure 2

[0071] ​In one embodiment, the heat pump system further comprises a first flow splitting device 81, which is configured to split the incoming refrigerant into different branches in a certain ratio. This flow distribution and adjustment can optimize the operation efficiency of the system, ensure the flow path between the throttling device 1 and the compressor 2 to be in the best state, and thus improve the performance and heating efficiency of the system.

[0072] Specifically, the converging port of the first flow splitting device 81 is connected to the second branch 42, the first flow splitting port of the first flow splitting device 81 is connected to the third branch 43, and the second flow splitting port of the first flow splitting device 81 is connected to the fourth branch 44.

[0073] When the first control valve 71 and the second control valve 72 are open, the refrigerant flows through the second branch 42, enters the third branch 43 through the second flow splitting port, and enters the fourth branch 44 through the third flow splitting port.

[0074] When the first control valve 71 and the second control valve 72 are closed, the refrigerant flows out of the throttling device 1, sequentially passes through the first branch 41, the first heat exchange pipeline 31, the connecting pipeline 6, the second heat exchange pipeline 32, the third branch 43, enters the first flow splitting device 81 through the first flow splitting port, and then flows out through the second flow splitting port and enters the fourth branch 44, the third heat exchange pipeline 33, the ninth branch 55, and the eighth branch 54, and then enters the compressor 2.

[0075] In one embodiment, the heat pump system further comprises a second flow splitting device 82, which has a similar function as the first flow splitting device 81. The second flow splitting device 82 is also configured to split the incoming refrigerant into different branches in a certain ratio, thereby optimizing the operation efficiency of the system.

[0076] Specifically, the converging port of the second flow splitting device 82 is connected to the throttling device 1, the third flow splitting port of the second flow splitting device 82 is connected to the first branch 41, the fourth flow splitting port of the second flow splitting device 82 is connected to the second branch 42, and the first control valve 71 is located between the first flow splitting device 81 and the second flow splitting device 82.

[0077] In this way, when the first control valve 71 and the second control valve 72 are open, the refrigerant flows out of the throttling device 1, and then is distributed into the first branch 41 and the second branch 42 through the second flow splitting device 82.

[0078] In summary, through the two flow splitting devices, the refrigerant can be split into multiple branches in different ratios, achieving more precise flow distribution. In this way, the flow of refrigerant in each branch can be flexibly adjusted according to the system design and actual working conditions, thereby improving the performance and energy efficiency of the system.

[0079] In one embodiment, the heat pump system further includes a controller electrically connected to the control valve to control the opening and closing of the control valve. Further, both the first control valve 71 and the second control valve 72 are solenoid valves.

[0080] This allows the heat pump system to achieve intelligent control, thereby maintaining optimal performance and energy efficiency under different operating conditions.

[0081] In one embodiment, such as Figure 3 As shown, the first delivery pipeline 4 also includes a tenth branch 45 connected between the fifth branch port of the first diversion device 81 and the first end of the fourth heat exchange pipeline 34, and the second delivery pipeline 5 also includes an eleventh branch 56 connected between the second end of the fourth heat exchange pipeline 34 and the compressor 2.

[0082] When the first control valve 71 and the second control valve 72 are opened, the heat exchange pipelines in the heat exchanger 3 are connected in parallel through the connection with each branch.

[0083] Specifically: When the first control valve 71 and the second control valve 72 are open, the first branch 41, the first heat exchange pipe 31, the connecting pipe 6 and the eighth branch 54 are connected in series to form the fourth channel; the second branch 42, the third branch 43, the second heat exchange pipe 32, the connecting pipe 6 and the eighth branch 54 are connected in series to form the fifth channel; the second branch 42, the fourth branch 44, the third heat exchange pipe 33 and the ninth branch 55 are connected in series to form the sixth channel; the second branch 42, the tenth branch 45, the fourth heat exchange pipe 34 and the eighth branch 54 are connected in series to form the eighth channel; in this way, after the refrigerant flows out from the throttling device 1, it enters the compressor 2 through the fourth channel, the fifth channel, the sixth channel and the eighth channel respectively.

[0084] When the first control valve 71 and the second control valve 72 are closed, the refrigerant flows out from the throttling device 1 and then along... Figure 2 The path indicated by the middle arrow flows sequentially through the first branch 41, the first heat exchange pipe 31, the connecting pipe 6, the second heat exchange pipe 32, and the third branch 43, then enters the first diversion device 81 from the first diversion port. It then enters the tenth branch 45 from the third diversion port, flows through the fourth heat exchange pipe 34 and the eleventh branch 56, and enters the eighth branch 54. It then enters the fourth branch 44 from the fifth diversion port, flows through the third heat exchange pipe 33 and the ninth branch 55, and finally enters the eighth branch 54, and finally enters the compressor 2 from the eighth branch 54.

[0085] It can be seen that after the refrigerant flows out of the throttling device 1, it flows along the... Figure 3 As indicated by the middle arrow, the first heat exchange pipe 31 and the second heat exchange pipe 32 are first connected in series, and then the flow is split by the third heat exchange pipe 33 and the fourth heat exchange pipe 34 connected in parallel before entering the compressor 2.

[0086] In one embodiment, as shown in Figure 4 Fig. 1, the first conveying pipeline 4 further comprises a twelfth branch 46 connected between the sixth shunt port of the first shunt device 81 and the first end of the fifth heat exchange pipeline 35, and the second conveying pipeline 5 further comprises a thirteenth branch 57 connected between the second end of the fifth heat exchange pipeline 35 and the second end of the first heat exchange pipeline 31.

[0087] When the first control valve 71 and the second control valve 72 are opened, each heat exchange pipeline in the heat exchanger 3 is connected in parallel through the connection between each branch and each pipeline.

[0088] Specifically, when the first control valve 71 and the second control valve 72 are opened, the first branch 41, the first heat exchange pipeline 31, the connection pipeline 6 and the eighth branch 54 are connected in series to form a fourth channel, the second branch 42, the third branch 43, the second heat exchange pipeline 32, the connection pipeline 6 and the eighth branch 54 are connected in series to form a fifth channel, the second branch 42, the fourth branch 44, the third heat exchange pipeline 33 and the ninth branch 55 are connected in series to form a sixth channel, and the second branch 42, the twelfth branch 46 and the fifth heat exchange pipeline 35 are connected in series and then connected with the thirteenth branch 57 to form a ninth channel. In this way, the refrigerant flows out of the throttling device 1 and then enters the compressor 2 through the fourth channel, the fifth channel, the sixth channel and the ninth channel.

[0089] When the first control valve 71 and the second control valve 72 are closed, the refrigerant flows out of the throttling device 1 and then flows along the path shown by the arrow in Figure 4 Fig. 2, sequentially through the first branch 41 and the first heat exchange pipeline 31, and then enters the second heat exchange pipeline and the third branch 43 through the connection pipeline 6 at the second end of the first heat exchange pipeline 31, and enters the fifth heat exchange pipeline 35 and the twelfth branch 46 through the thirteenth branch 57, and then the two paths converge into the first shunt device 81, and then enters the compressor 2 through the fourth branch 44, the third heat exchange pipeline 33 and the ninth branch 55.

[0090] As can be seen, the refrigerant flows out of the throttling device 1 and then flows along the path shown by the arrow in Figure 4 Fig. 3, through the first heat exchange pipeline 31, and then is shunted through the third heat exchange pipeline 33 and the fourth heat exchange pipeline 34 which are connected in parallel, and then enters the compressor 2 through the third heat exchange pipeline 33.

[0091] In one embodiment, as shown in Figure 5 Fig. 1, the first conveying pipeline 4 further comprises a fourteenth branch 47 connected between the shunt port of the second shunt device 82 and the first end of the sixth heat exchange pipeline 36, and the second conveying pipeline 5 further comprises a fifteenth branch 58 connected between the second end of the sixth heat exchange pipeline 36 and the second end of the second heat exchange pipeline 32.

[0092] When the first control valve 71 and the second control valve 72 are opened, the heat exchange pipelines in the heat exchanger 3 are connected in parallel through the connection with each branch.

[0093] Specifically: When the first control valve 71 and the second control valve 72 are open, the first branch 41, the first heat exchange pipe 31, the connecting pipe 6 and the eighth branch 54 are connected in series to form the fourth channel; the second branch 42, the third branch 43, the second heat exchange pipe 32, the connecting pipe 6 and the eighth branch 54 are connected in series to form the fifth channel; the second branch 42, the fourth branch 44, the third heat exchange pipe 33 and the ninth branch 55 are connected in series to form the sixth channel; the fourteenth branch 47, the sixth heat exchange pipe 36 and the fifteenth branch 58 are connected to form the tenth channel; in this way, after the refrigerant flows out from the throttling device 1, it enters the compressor 2 through the fourth channel, the fifth channel, the sixth channel and the tenth channel respectively.

[0094] When the first control valve 71 and the second control valve 72 are closed, the refrigerant flows out from the throttling device 1 and then along... Figure 5 The path indicated by the middle arrow first splits into two paths via the second diversion device 82. One path flows sequentially through the first branch 41, the first heat exchange pipe 31, and the connecting pipe 6; the other path flows sequentially through the fourteenth branch 47, the sixth heat exchange pipe 36, and the fifteenth branch 58. These two paths then converge at the second end of the second heat exchange pipe 32 and enter the first diversion device 81 via the second heat exchange pipe 32 and the third branch 43. After exiting the first diversion device 81, the path flows sequentially through the fourth branch 44 and the third heat exchange pipe 33, and then through the ninth branch 55 and the eighth branch 54 before entering the compressor 2.

[0095] It can be seen that after the refrigerant flows out of the throttling device 1, it flows along the... Figure 5 The path indicated by the middle arrow first splits through the first heat exchanger pipe 31 and the sixth heat exchanger pipe 36, which are connected in parallel, and then merges in the second heat exchanger pipe 32 and enters the compressor 2 through the third heat exchanger pipe.

[0096] Please refer to Figure 6 and 7 As shown, embodiments of the present invention also provide a control method for the above-described heat pump system.

[0097] First, it should be noted that in cooling mode, in order to improve the energy efficiency ratio of the heat pump system, the heat exchange pipes in heat exchanger 3 should be connected in series as much as possible. In the cooling mode, the heat exchange pipes in the heat exchanger 3 of the heat pump system provided in this embodiment of the invention are connected in the same way as in the heating mode at lower temperatures (e.g., above -12 degrees Celsius), except that the flow direction of the refrigerant in the pipes is reversed.

[0098] Therefore, in the embodiment, the working condition of the heat pump system operating in the heating mode at different ambient temperatures is mainly taken as an example for illustration.

[0099] In one embodiment, as shown in Figure 1 and 6 In the state of the heat pump system operating in the heating mode, the ambient temperature is first acquired in step S100, and the opening and closing of the first control valve 71 is selectively controlled according to the ambient temperature.

[0100] Then, it is determined in step S200 whether the ambient temperature is greater than a first preset temperature, for example, -12 degrees Celsius. When the ambient temperature is greater than the first preset temperature, the number of parallel heat exchange pipelines in the heat exchanger 3 needs to be reduced to improve the energy efficiency of the entire system, and then step S210 is executed, in which the controller closes the first control valve 71, and the refrigerant flows out of the throttling device 1 and enters the compressor 2 through the first passage.

[0101] When the ambient temperature is less than or equal to the first preset temperature, it indicates that the heat pump system operates in an ultra-low temperature environment, in which the heat supply demand for the heat pump system is large, and in order to reduce the pressure drop of the heat exchanger 3 and maintain the stability of the system operation, the heat exchange pipelines in the heat exchanger 3 need to be connected in parallel, and then step S220 is executed, in which the controller opens the first control valve 71, so that the first heat exchange pipeline 31, the second heat exchange pipeline 32 and the third heat exchange pipeline 33 in the heat exchanger 3 are connected in parallel, and the refrigerant enters the compressor 2 through the first passage, the second passage and the third passage, respectively.

[0102] In one embodiment, as shown in Figure 2 and 7 In the state of the heat pump system operating in the heating mode, the ambient temperature is first acquired in step S100, and the opening and closing of the first control valve 71 and the second control valve 72 is selectively controlled according to the ambient temperature.

[0103] Then, it is determined in step S200 whether the ambient temperature is greater than a first preset temperature, for example, -12 degrees Celsius.

[0104] When the ambient temperature is greater than the first preset temperature, the number of parallel heat exchange pipelines in the heat exchanger 3 needs to be reduced to improve the energy efficiency of the entire system, and then step S230 is executed, in which the controller closes the first control valve 71 and the second control valve 72, so that the first heat exchange pipeline 31, the second heat exchange pipeline 32 and the third heat exchange pipeline 33 in the heat exchanger 3 are connected in series, and the refrigerant flows out of the throttling device 1 and enters the compressor 2 through the first heat exchange pipeline 31, the second heat exchange pipeline 32 and the third heat exchange pipeline 33, respectively.

[0105] When the ambient temperature is less than or equal to the first preset temperature, at this time, it is indicated that the heat pump system is running in an ultra-low temperature environment, in which the heat pump system has a large demand for heat supply, in order to reduce the pressure drop of the heat exchanger 3 and maintain the stability of the system operation, it is necessary to parallel the heat exchange pipelines in the heat exchanger 3, then step S240 is executed, the controller opens the first control valve 71 and the second control valve 72, so that the first heat exchange pipeline 31, the second heat exchange pipeline 32 and the third heat exchange pipeline 33 in the heat exchanger 3 are parallel, and the refrigerant will enter the compressor 2 through the fourth channel, the fifth channel and the sixth channel respectively.

[0106] As can be seen, by controlling the opening and closing of the first control valve 71 and the second control valve 72, the operation mode of the heat pump system can be adjusted without the need for complex pipeline structure adjustment, and such a scheme makes the operation of the heat pump system more flexible and reliable.

[0107] Further, the heat pump system and the control method thereof provided by the embodiment of the present application can realize stable and efficient operation of the system under different ambient temperature conditions and different heat supply demands, so as to effectively cope with variable climate conditions and energy demands.

[0108] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A heat pump system, comprising a throttling device, a heat exchanger, and a compressor, characterized in that, A first delivery pipeline is provided between the first end of the heat exchanger and the throttling device, and a second delivery pipeline is provided between the second end of the heat exchanger and the compressor. The first delivery pipeline and / or the second delivery pipeline includes multiple branches arranged in parallel, and at least one of the branches is provided with a control valve, so that when the control valve is open, multiple parallel channels are formed between the first delivery pipeline and the second delivery pipeline, and when the control valve is closed, a series channel is formed between the first delivery pipeline and the second delivery pipeline.

2. The heat pump system according to claim 1, characterized in that, The first delivery pipeline includes a first branch and a second branch connected in parallel between the throttling device and the first end. The second branch near the end of the heat exchanger is also connected in parallel with a third branch and a fourth branch. The third branch and the fourth branch are both connected to the throttling device. The control valve includes a first control valve located on the second branch. The second delivery pipeline includes a fifth branch, a sixth branch, and a seventh branch connected in parallel between the second end and the compressor. The fifth branch is connected in series with the first branch to form a first channel. When the first control valve is opened, the second branch, the third branch, and the sixth branch are connected in series to form a second channel, and the second branch, the fourth branch, and the seventh branch are connected in series to form a third channel.

3. The heat pump system according to claim 1, characterized in that, The first delivery pipeline includes a first branch and a second branch connected in parallel between the throttling device and the first end. The second branch has a third branch and a fourth branch connected in parallel near the end of the heat exchanger. The third branch and the fourth branch are connected to the throttling device. The control valve includes a first control valve located on the second branch. The second delivery pipeline includes a connecting pipeline connected to the second end, the two ends of the connecting pipeline being connected to the first branch and the third branch respectively, and the connecting pipeline is also connected to the compressor via an eighth branch. The second delivery pipeline also includes a ninth branch connected between the second end and the compressor, and the control valve also includes a second control valve disposed on the eighth branch near the end of the connecting pipeline. When the first control valve and the second control valve are open, the first branch, the connecting pipe, and the eighth branch are connected in series to form a fourth channel; the second branch, the third branch, the connecting pipe, and the eighth branch are connected in series to form a fifth channel; and the second branch, the fourth branch, and the ninth branch are connected in series to form a sixth channel; or... When the first control valve and the second control valve are closed, the first branch, the connecting pipeline, the third branch, the fourth branch, the ninth branch, and the eighth branch are connected in series to form a seventh channel.

4. The heat pump system according to claim 3, characterized in that, The heat pump system also includes: The first diversion device has its junction port connected to the second branch, its first diversion port connected to the third branch, and its second diversion port connected to the fourth branch.

5. The heat pump system according to claim 4, characterized in that, The heat pump system also includes: The second diversion device has its manifold connected to the throttling device, its third diversion port connected to the first branch, its fourth diversion port connected to the second branch, and the first control valve located between the first diversion device and the second diversion device.

6. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: A controller, which is electrically connected to the control valve, controls the opening and closing of the control valve.

7. The heat pump system according to claim 3, characterized in that, Both the first control valve and the second control valve are solenoid valves.

8. A control method for a heat pump system, characterized in that, The heat pump system includes a throttling device, a heat exchanger, and a compressor. A first delivery pipeline is provided between the first end of the heat exchanger and the throttling device, and a second delivery pipeline is provided between the second end of the heat exchanger and the compressor. The first delivery pipeline and / or the second delivery pipeline includes multiple parallel branches, and at least one of the branches is provided with a control valve, so that when the control valve is open, multiple parallel channels are formed between the first delivery pipeline and the second delivery pipeline, and when the control valve is closed, a series channel is formed between the first delivery pipeline and the second delivery pipeline. The control method includes: When the heat pump system is operating in heating mode, the control valve is selectively opened or closed according to the ambient temperature.

9. The control method for a heat pump system according to claim 8, characterized in that, The first delivery pipeline includes a first branch and a second branch connected in parallel between the throttling device and the first end. The second branch near the end of the heat exchanger is also connected in parallel with a third branch and a fourth branch. The third branch and the fourth branch are both connected to the throttling device. The control valve includes a first control valve located on the second branch. The second delivery pipeline includes a fifth branch, a sixth branch, and a seventh branch connected in parallel between the second end and the compressor. The fifth branch is connected in series with the first branch to form a first channel. When the first control valve is opened, the second branch, the third branch, and the sixth branch are connected in series to form a second channel, and the second branch, the fourth branch, and the seventh branch are connected in series to form a third channel. The phrase "selectively controlling the opening or closing of the control valve based on the ambient temperature while the heat pump system is operating in heating mode" includes: When the ambient temperature is less than or equal to the first preset temperature, the first control valve is controlled to open; When the ambient temperature is higher than the first preset temperature, the first control valve is controlled to close.

10. The control method for a heat pump system according to claim 8, characterized in that, The first delivery pipeline includes a first branch and a second branch connected in parallel between the throttling device and the first end. The second branch has a third branch and a fourth branch connected in parallel near the end of the heat exchanger. The third branch and the fourth branch are connected to the throttling device. The control valve includes a first control valve located on the second branch. The second delivery pipeline includes a connecting pipeline connected to the second end, the two ends of the connecting pipeline being connected to the first branch and the third branch respectively, and the connecting pipeline is also connected to the compressor via an eighth branch. The second delivery pipeline also includes a ninth branch connected between the second end and the compressor, and the control valve also includes a second control valve disposed on the eighth branch near the end of the connecting pipeline. When the first control valve and the second control valve are open, the first branch, the connecting pipe, and the eighth branch are connected in series to form a fourth channel; the second branch, the third branch, the connecting pipe, and the eighth branch are connected in series to form a fifth channel; and the second branch, the fourth branch, and the ninth branch are connected in series to form a sixth channel; or... When the first control valve and the second control valve are closed, the first branch, the connecting pipeline, the third branch, the fourth branch, the ninth branch, and the eighth branch are connected in series to form a seventh channel. The phrase "selectively controlling the opening or closing of the control valve based on the ambient temperature while the heat pump system is operating in heating mode" further includes: When the ambient temperature is less than or equal to the first preset temperature, control the first control valve and the second control valve to open. When the ambient temperature is higher than the second preset temperature, the first control valve and the second control valve are controlled to close.

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