Heat pump unit

Abstract

The invention relates to a heat pump unit which comprises an outdoor unit, a water module and an indoor unit, the water module comprises a first plate heat exchanger and a second plate heat exchanger, a first refrigeration channel is connected with the outdoor unit and a second refrigeration channel, and the other end of the second refrigeration channel is connected with the outdoor unit; a middle pipeline is connected between the first refrigerating channel and the second refrigerating channel, a first expansion valve and a second expansion valve are arranged on the middle pipeline, the indoor unit comprises at least two indoor units, and each indoor unit is selectively connected with the first cold carrying channel and the second cold carrying channel. According to the working requirements of all indoor units, the working states of the first plate heat exchanger and the second plate heat exchanger are controlled, the two plate heat exchangers share one outdoor unit, and multiple working modes including a heating mode, a refrigerating mode, a heating main mode and a refrigerating main mode are achieved through cooperation of the plate heat exchangers, a four-way valve and other valve sets. Structural connection is relatively simple, and installation space is small.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning equipment technology, and particularly relates to a heat pump unit. Background Technology

[0002] The plate heat exchanger in a heat pump unit is a device that uses refrigerant to exchange heat with water. Its working principle is based on the principle of heat conduction. When water flows through the heat exchanger, it exchanges heat with the refrigerant, thereby achieving the purpose of cooling or heating the water.

[0003] In existing heat pump units, each indoor unit can only cool or heat simultaneously, which cannot meet the different temperature control needs of each indoor environment. If the heat pump unit is to operate in both heating and cooling functions at the same time, a three-tube unit is required, but its installation process is complicated, occupies a lot of space, and is costly. Summary of the Invention

[0004] The purpose of this invention is to provide a heat pump unit that solves the problems of existing heat pump units where each indoor unit can only heat or cool simultaneously, resulting in a single mode, inability to adjust the temperature according to the different indoor space requirements, and poor user experience.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: This invention proposes a heat pump unit, which includes: Outdoor unit; Water module, which includes: The first plate heat exchanger has a first refrigeration channel and a first cooling channel inside. The second plate heat exchanger has a second refrigeration channel and a second cooling channel inside it. Wherein, one end of the first refrigeration channel is connected to the outdoor unit, and the other end is connected to the second refrigeration channel, and the other end of the second refrigeration channel is connected to the outdoor unit; an intermediate pipeline is connected between the first refrigeration channel and the second refrigeration channel, and a first expansion valve and a second expansion valve are provided on the intermediate pipeline, with the first expansion valve close to the first refrigeration channel and the second expansion valve close to the second refrigeration channel; An indoor unit comprising at least two indoor units, each of which is selectively connected to the first cooling aisle and the second cooling aisle; The controller is configured to control the operating state of the first plate heat exchanger and the second plate heat exchanger according to the operating requirements of each of the indoor units, so that the corresponding indoor unit is connected to the first cooling channel or the second cooling channel.

[0006] In some embodiments of this application, the outdoor unit includes a compressor, an outdoor heat exchanger, and a four-way valve. The first valve port of the four-way valve is connected to the output end of the compressor through a first main line, the second valve port of the four-way valve is connected to the water module through the first main line, the third valve port of the four-way valve is connected to the input end of the compressor through a third main line, and the fourth valve port of the four-way valve is connected to the outdoor heat exchanger through a fourth main line. The outdoor heat exchanger and the second refrigeration channel are connected by a fifth main line, and an outdoor expansion valve is installed on the fifth main line. A gas-liquid separator is also provided between the compressor and the third valve port.

[0007] In some embodiments of this application, each indoor unit is connected to the first end of the first cooling aisle via a first water inlet pipe and to the first end of the second cooling aisle via a second water inlet pipe; Each of the indoor units is connected to the second end of the first cooling aisle via a first water outlet pipe, and to the second end of the second cooling aisle via a second water outlet pipe; A first water pump is installed on the first water inlet pipe, and a second water pump is installed on the second water inlet pipe.

[0008] In some embodiments of this application, each indoor unit is connected to a first water supply branch and a second water supply branch at both ends, and the first water supply branch is connected to the first water inlet pipe and the second water inlet pipe through a three-way valve. The second water supply branch is connected to the first and second water outlet pipes via a three-way valve; A switch valve is installed on the second water supply branch.

[0009] In some embodiments of this application, during full heating mode, all indoor units in operation are in heating mode. The controller controls the connection of the first valve port and the second valve port of the four-way valve, and the connection of the third valve port and the fourth valve port. The first expansion valve and the second expansion valve are fully open, the outdoor expansion valve is opened to a preset opening degree, the second water pump is turned off, and the first water pump is turned on. The refrigerant output from the compressor is delivered to the first plate heat exchanger for heat exchange through a four-way valve. After being output from the first plate heat exchanger, it is delivered to the second plate heat exchanger. Then, after being throttled by the outdoor expansion valve on the fifth main line, it is delivered to the outdoor heat exchanger for heat exchange. Finally, it is returned to the compressor. After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel and is heated. Then, it is transported to the corresponding indoor unit for heating through the first outlet pipe and the second water supply branch.

[0010] In some embodiments of this application, in full cooling mode, all indoor units in operation are in cooling mode. The controller controls the first and fourth valve ports of the four-way valve to connect, the second and third valve ports to connect, the first expansion valve opens to a preset opening degree, and the second expansion valve and the outdoor expansion valve are fully opened; the second water pump is turned off, and the first water pump is turned on. The refrigerant output from the compressor is delivered to the outdoor heat exchanger through a four-way valve for heat exchange. Then, it is delivered to the second plate heat exchanger through the fifth main line. After being output from the second plate heat exchanger, it is throttled by the first expansion valve and delivered to the first plate heat exchanger for heat exchange. Finally, it is delivered back to the compressor. After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel to cool down. Then, it is transported to the corresponding indoor unit through the first outlet pipe and the second water supply branch for cooling.

[0011] In some embodiments of this application, when heating is the primary mode, the number of indoor units in heating mode is greater than the number of indoor units in cooling mode. The controller controls the connection of the first valve port to the second valve port and the third valve port to the fourth valve port of the four-way valve; the first expansion valve is fully open, the second expansion valve and the outdoor expansion valve are opened to a preset opening degree, and the first water pump and the second water pump are turned on. The refrigerant output from the compressor is delivered to the first plate heat exchanger for heat exchange via a four-way valve. After being output from the first plate heat exchanger, it is throttled by the second expansion valve and then delivered to the second plate heat exchanger for heat exchange. The refrigerant output from the second plate heat exchanger is throttled by the outdoor expansion valve on the fifth main line and then delivered to the outdoor heat exchanger for heat exchange before being returned to the compressor.

[0012] After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel and is heated. Then, it is transported to the corresponding indoor unit for heating through the first outlet pipe and the second water supply branch. After the second water pump is turned on, the water in the second inlet pipe is transported to the second cooling channel, where it exchanges heat with the refrigerant in the second cooling channel to cool down. Then, it is transported to the corresponding indoor unit through the second outlet pipe and the second water supply branch for cooling.

[0013] In some embodiments of this application, when cooling is the main mode, the number of indoor units in heating mode is no greater than the number of indoor units in cooling mode. The controller controls the four-way valve to connect the first valve port to the fourth valve port, and the second valve port to the third valve port. The first expansion valve opens to a preset opening degree, and the second expansion valve and the outdoor expansion valve are fully opened. The first water pump and the second water pump are turned on. The refrigerant output from the compressor is delivered to the outdoor heat exchanger through a four-way valve for heat exchange. Then, it is delivered to the second plate heat exchanger through the fifth main line. After heat exchange in the second plate heat exchanger, it is output. After throttling through the first expansion valve, it is delivered to the first plate heat exchanger for heat exchange and finally returned to the compressor. After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel to cool down. Then, it is transported to the corresponding indoor unit through the first outlet pipe and the second water supply branch for cooling. After the second water pump is turned on, the water in the second inlet pipe is transported to the second cooling channel, where it exchanges heat with the refrigerant in the second cooling channel and is heated. Then, it is transported to the corresponding indoor unit for heating through the second outlet pipe and the second water supply branch.

[0014] In some embodiments of this application, when switching from heating-primary mode to cooling-primary mode, the controller controls the first and second water pumps to shut down, and the heat exchange fan in the indoor unit to shut down; the controller controls the first valve port of the four-way valve to switch to connect with the fourth valve port, and the second valve port to switch to connect with the third valve port. After the four-way valve switches, the compressor continues to run for a first preset time, and then the first and second water pumps are turned on. When the water temperature in the first cooling channel drops below the first preset temperature, and the water temperature in the second cooling channel rises above the second temperature, the controller controls the heat exchange fan in the indoor unit to turn on.

[0015] In some embodiments of this application, when switching from cooling-oriented mode to heating-oriented mode, the controller controls the first and second water pumps to shut down, the heat exchange fan in the indoor unit to shut down, and the controller controls the first valve port of the four-way valve to switch to connect with the second valve port and the third valve port to connect with the fourth valve port. After the four-way valve switches, the compressor continues to run for a second preset time, and then the first and second water pumps are turned on. When the water temperature in the first cooling channel rises above a third preset temperature and the water temperature in the second cooling channel drops below a fourth temperature, the controller controls the heat exchange fan in the indoor unit to turn on.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: The heat pump unit involved in this application includes a water module with two plate heat exchangers and an outdoor unit equipped with at least one four-way valve. The two plate heat exchangers share one outdoor unit. Through the cooperation of the plate heat exchangers, the four-way valve, and other valve groups, multiple working modes such as heating mode, cooling mode, heating-main mode, and cooling-main mode can be realized, thereby meeting the different working modes of each indoor unit connected to the heat pump unit. It does not require a three-pipe unit, the structural connection is relatively simple, and the installation space is small.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the schematic diagrams of a heat pump system according to an embodiment; Figure 2 This is a structural diagram of the water module according to an embodiment; Figure 3 This is a structural diagram of a four-way valve according to an embodiment; Figure 4 According to Figure 1 One of the refrigerant and water flow route diagrams for the full heating mode in the embodiment; Figure 5 According to Figure 1 Second example of refrigerant and water flow route diagram in full heating mode; Figure 6 According to Figure 1 Refrigerant and water flow path diagram for the full cooling mode in the embodiment; Figure 7 According to Figure 1 Flow diagram of refrigerant and water in the heating-primary mode of the embodiment; Figure 8 According to Figure 1 Flow diagram of refrigerant and water in the refrigeration-primary mode of the embodiment; Figure 9 According to Figure 1 Flowcharts of the heating-primary mode and the cooling-primary mode in the embodiment; Figure 10 According to Figure 1 Flowcharts of the cooling-primary mode and the heating-primary mode in the embodiment; Figure 11 This is a second schematic diagram of a heat pump system according to an embodiment; Figure 12 According to Figure 11 A schematic diagram of the outdoor unit connection in the embodiments involved; Figure 13 According to Figure 11 Flow diagram of refrigerant and water in full heating mode of the embodiment; Figure 14 According to Figure 11Refrigerant and water flow path diagram for the full cooling mode in the embodiment; Figure 15 According to Figure 11 Flow diagram of refrigerant and water in the heating-primary mode of the embodiment; Figure 16 According to Figure 11 Flow diagram of refrigerant and water in the refrigeration-primary mode of the embodiment; Figure label: 1. Outdoor unit; 2. Water module; 3. Indoor unit; 10. Compressor; 11. Gas-liquid separator; 20. Four-way valve; 21. First four-way valve; 22. Second four-way valve; 23. Third four-way valve; 201, First valve port; 202, Second valve port; 203, Third valve port; 204, Fourth valve port; 30. Outdoor heat exchanger; 40. First plate heat exchanger; 41. First refrigeration passage; 42. First cooling passage; 50. Second plate heat exchanger; 51. Second refrigeration passage; 52. Second cooling passage; 61. First indoor unit; 62. Second indoor unit; 63. Third indoor unit; 70. Three-way valve; 80. On / off valve; 100. Refrigerant main circuit; 110. First main circuit; 120. Second main circuit; 130. Third main circuit; 200. Fourth main circuit; 300. Fifth main circuit; 310. Outdoor expansion valve; 400, intermediate pipeline; 410, first extension pipeline; 411, first expansion valve; 420, second extension pipeline; 421, second expansion valve; 510. First water inlet pipe; 511. First water pump; 520. Second water inlet pipe; 521. Second water pump; 610. First water outlet pipe; 620. Second water outlet pipe; 710, First water conveyance branch; 720, Second water conveyance branch. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] refer to Figures 1-3 This application proposes a heat pump unit, which includes an outdoor unit 1, a water module 2, and an indoor unit 3.

[0027] The water module 2 includes a first plate heat exchanger 40 and a second plate heat exchanger 50. The first plate heat exchanger 40 is provided with a first refrigeration channel 41 and a first cooling channel 42. The second plate heat exchanger 50 is provided with a second refrigeration channel 51 and a second cooling channel 52.

[0028] One end of the first refrigeration channel 41 is connected to the outdoor unit 1, and the other end is connected to the second refrigeration channel 51. The other end of the second refrigeration channel 51 is also connected to the outdoor unit 1.

[0029] An intermediate pipe 400 is connected between the first refrigeration channel 41 and the second refrigeration channel 51. A first expansion valve 411 and a second expansion valve 421 are installed on the intermediate pipe 400. The first expansion valve 411 is close to the first refrigeration channel 41, and the second expansion valve 421 is close to the second refrigeration channel 51.

[0030] Specifically, for ease of description, the two ends of the intermediate conduit 400 are respectively provided with a first extension conduit 410 and a second extension conduit 420.

[0031] The intermediate pipe 400 is connected to the first refrigeration channel 41 through the first extension pipe 410. The first expansion valve 411 is installed on the first extension pipe 410. By opening the first expansion valve 411 to a preset opening degree, the refrigerant input to the first plate heat exchanger 40 is throttled.

[0032] The intermediate pipe 400 is connected to the second refrigeration channel 51 through the second extension pipe 420. The second expansion valve 421 is installed on the second extension pipe 420. By opening the second expansion valve 421 to a preset opening degree, the refrigerant input to the second plate heat exchanger 50 is throttled.

[0033] The indoor unit 3 includes at least two indoor units, each of which is selectively connected to the first cooling aisle 42 and the second cooling aisle 52.

[0034] The controller is configured to control the operating status of the first plate heat exchanger 40 and the second plate heat exchanger 50 according to the operating requirements of each indoor unit, so that the corresponding indoor unit is connected to the first cooling channel 41 or the second cooling channel 51.

[0035] The outdoor unit 1 is equipped with a four-way valve 20. Two plate heat exchangers share one outdoor unit 1. Through the cooperation of the plate heat exchangers, the four-way valve 20 and other valve groups, multiple working modes such as heating mode, cooling mode, heating-main mode and cooling-main mode can be realized. This enables different working modes of each indoor unit connected to the heat pump unit. There is no need to set up a three-pipe unit. The structure and connection are relatively simple and the installation space is small.

[0036] In some embodiments of this application, the outdoor unit 1 includes a compressor 10, an outdoor heat exchanger 30, and a four-way valve 20. The first valve port 201 of the four-way valve 20 is connected to the output end of the compressor 10 through the refrigerant main line 100, the second valve port 202 of the four-way valve 20 is connected to the water module 2, the third valve port 203 of the four-way valve 20 is connected to the input end of the compressor 10, and the fourth valve port 204 of the four-way valve 20 is connected to the outdoor heat exchanger 30 through the fourth main line 200.

[0037] The outdoor heat exchanger 30 and the second refrigeration channel 51 are connected by the fifth main circuit 300, and an outdoor expansion valve 310 is installed on the fifth main circuit 300.

[0038] A gas-liquid separator 11 is also provided between the compressor 10 and the third valve port 203. The refrigerant output from the third valve port 203 is filtered by the gas-liquid separator 11 and then returned to the compressor 10.

[0039] In some embodiments of this application, each indoor unit is connected to the first end of the first cooling channel 42 via a first water inlet pipe 510 and to the first end of the second cooling channel 52 via a second water inlet pipe 520.

[0040] Each indoor unit is connected to the second end of the first cooling aisle 42 via the first water outlet pipe 610, and to the second end of the second cooling aisle 52 via the second water outlet pipe 620.

[0041] A first water pump 511 is installed on the first water inlet pipe 510, and a second water pump 521 is installed on the second water inlet pipe 520, which are used to drive the flow of water in the first water inlet pipe 510 and the second water inlet pipe 520, respectively.

[0042] Each indoor unit has a first water supply branch 710 and a second water supply branch 720 connected to its two ends respectively. The first water supply branch 710 is connected to the first water inlet pipe 510 and the second water inlet pipe 520 through a three-way valve 70.

[0043] The second water supply branch 720 is connected to the first water outlet pipe 610 and the second water outlet pipe 620 via a three-way valve 70.

[0044] The three-way valves 70 on the first water supply branch 710 and the second water supply branch 720 are respectively set and connected to the same indoor unit to form an indoor circulation loop.

[0045] In other words, one end of each indoor unit in the indoor unit 3 is connected to a first water supply branch 710, and the other end of the first water supply branch 710 is connected to a first water inlet pipe 510 and a second water inlet pipe 520 through a three-way valve 70. The first water inlet pipe 510 is connected to one end of the first cooling aisle 42; the second water inlet pipe 520 is connected to one end of the second cooling aisle 52.

[0046] The other end of the first cooling channel 42 is connected to the first water outlet pipe 610, and the other end of the second cooling channel 52 is connected to the second water outlet pipe 620. The first water outlet pipe 610 and the second water outlet pipe 620 are connected to the second water supply branch 720 through a three-way valve 70. The other end of the second water supply branch 720 is connected to the other end of the indoor unit, forming a complete water circulation.

[0047] A switch valve 80 is installed on the second water supply branch 720 to control the on / off state of the second water supply branch 720.

[0048] When the switch valve 80 on the second water supply branch 720 of the indoor unit is open, water flowing through the first cooling channel 42 or the second cooling channel 52 is delivered to the indoor unit by the drive of the first water pump 511 and the second water pump 521 to achieve the purpose of cooling or heating.

[0049] In some embodiments of this application, an outdoor expansion valve 310 is provided on the fifth main line 300. By opening the outdoor expansion valve 310 with a preset opening degree, the refrigerant input to the outdoor heat exchanger 30 can be throttled.

[0050] The heat pump unit involved in this application can realize full heating mode, full cooling mode, heating-main mode, and cooling-main mode.

[0051] <Full Heating Mode> Combination Figures 2-5 In full heating mode, all indoor units are in heating mode. That is, all indoor units can be turned on or partially turned on, but all indoor units that are turned on are in heating mode.

[0052] The controller controls the first valve port 201 of the four-way valve 20 to connect with the second valve port 202, and the third valve port 203 to connect with the fourth valve port 204; the first expansion valve 411 and the second expansion valve 421 are fully opened, the outdoor expansion valve 310 is opened to a preset opening degree, the second water pump 521 is turned off, and the first water pump 511 is turned on.

[0053] In each working process, the first water supply branch 710 of the indoor unit is connected to the first water inlet pipe 510 through a three-way valve 70, and the second water supply branch 720 is connected to the first water outlet pipe 610 through a three-way valve 70. The corresponding switch valve 80 on the second water supply branch 720 is opened.

[0054] The refrigerant output from the compressor 10 is delivered to the first plate heat exchanger 40 for heat exchange via the four-way valve 20. After being output from the first plate heat exchanger 40, it is delivered to the second plate heat exchanger 50. Then, after being throttled by the outdoor expansion valve 310 on the fifth main circuit 300, it is delivered to the outdoor heat exchanger 30 for heat exchange. Finally, it is returned to the compressor 10.

[0055] In full heating mode, the second water pump 521 is shut down, the second plate heat exchanger 50 does not perform heat exchange operations, and the first expansion valve 411 and the second expansion valve 421 are fully open, so they do not throttle the refrigerant.

[0056] After the first water pump 511 is turned on, the water in the first inlet pipe 510 is transported to the first cooling channel 42, where it exchanges heat with the refrigerant in the first cooling channel 41 and is then heated. After that, the water is transported to the corresponding indoor unit for heating through the first outlet pipe 610 and the second water supply branch 720.

[0057] Specifically, the high-temperature and high-pressure refrigerant output from the compressor 10 is transported to the first heating channel through the first valve port 201 and the second valve port 202 of the four-way valve 20. After exchanging heat with the water flowing through the first heat transfer channel in the first heating channel, the refrigerant is output. The output refrigerant is then transported to the second heating channel through the first extension pipe 410, the intermediate pipe 400 and the second extension pipe 420. No heat exchange operation is performed in the second heating channel, and the refrigerant flows out directly. After being throttled by the outdoor expansion valve on the fifth main line 300, the refrigerant is transported to the outdoor heat exchanger 30 for heat exchange, and finally flows back to the compressor 10.

[0058] The first water pump 511 drives the water in the first inlet pipe 510 to be transported to the first heat-carrying channel. After exchanging heat with the water in the first heating channel and being heated, the water is output from the first outlet pipe 610, and then transported to the corresponding indoor unit through the three-way valve 70 and the second water supply branch 720 to achieve the purpose of heating the indoor space. The water output from the indoor unit is circulated back to the first inlet pipe 510 through the first water supply branch 710 and continues to circulate.

[0059] Full Cooling Mode Combination Figure 2 , Figure 3 as well as Figure 6 In full cooling mode, all indoor units are in cooling mode. That is, all indoor units can be turned on or partially turned on, but all indoor units that are turned on are in cooling mode.

[0060] The controller controls the four-way valve 20 to connect the first valve port 201 and the fourth valve port 204, and the second valve port 202 and the third valve port 203. The first expansion valve 411 opens to a preset opening degree, and the second expansion valve 421 and the outdoor expansion valve 310 are fully opened. The second water pump 521 is turned off, and the first water pump 511 is turned on.

[0061] In each working process, the first water supply branch 710 of the indoor unit is connected to the first water inlet pipe 510 through a three-way valve 70, and the second water supply branch 720 is connected to the first water outlet pipe 610 through a three-way valve 70. The corresponding switch valve 80 on the second water supply branch 720 is opened.

[0062] The refrigerant output from the compressor 10 is delivered to the outdoor heat exchanger 30 through the four-way valve 20 for heat exchange. Then, it is delivered to the second plate heat exchanger 50 through the fifth main line 300. After being output from the second plate heat exchanger 50, it is throttled by the first expansion valve 411 and delivered to the first plate heat exchanger 40 for heat exchange. Finally, it is delivered back to the compressor 10. After the first water pump 511 is turned on, the water in the first inlet pipe 510 is transported to the first cooling channel 42, where it exchanges heat with the refrigerant in the first cooling channel 41 and is then cooled. After cooling, the water is transported to the corresponding indoor unit through the first outlet pipe 610 and the second water supply branch 720 for cooling.

[0063] Specifically, the high-temperature and high-pressure refrigerant output from the compressor 10 is transported to the outdoor heat exchanger 30 through the first valve port 201 and the fourth valve port 204 of the four-way valve 20. After heat exchange in the outdoor heat exchanger 30, it is transported to the second heating channel through the fifth main circuit 300. The second water pump 521 is in the off state, and the second plate heat exchanger 50 does not perform heat exchange operation. The refrigerant output from the second plate heat exchanger 50 is throttled by the first expansion valve 411 and then transported to the first plate heat exchanger 40 for heat exchange. Finally, the refrigerant output from the first plate heat exchanger 40 flows back to the compressor 10 through the four-way valve 20, completing the refrigerant cycle in the full cooling mode.

[0064] The first water pump 511 drives the water in the first inlet pipe 510 to be transported to the first heat-carrying channel. After exchanging heat with the water in the first heating channel and cooling down, the water is output from the first outlet pipe 610, and then transported through the three-way valve 70 and the second water supply branch 720 to the corresponding indoor unit in operation, thereby achieving the purpose of heating the indoor space. The water output from the indoor unit is circulated back to the first inlet pipe 510 through the first water supply branch 710 to continue circulating. <Heating-Primary Mode> Combination Figure 2 , Figure 3 as well as Figure 7When heating is the primary mode, the number of indoor units in heating mode in indoor unit 3 is greater than the number of indoor units in cooling mode.

[0065] Each indoor unit in heating mode is connected to the first water supply branch 710 via a three-way valve 70 and the second water supply branch 720 via a three-way valve 70 and the second water supply pipe 520. The corresponding switch valve 80 on the second water supply branch 720 is opened.

[0066] Each indoor unit in cooling mode is connected to the first water supply branch 710 via a three-way valve 70 and the second water inlet pipe 520 via a three-way valve 70. The second water supply branch 720 is connected to the second water outlet pipe 620 via a three-way valve 70, and the corresponding switch valve 80 on the second water supply branch 720 is opened.

[0067] The controller controls the first valve port 201 of the four-way valve 20 to connect with the second valve port 202, and the third valve port 203 to the fourth valve port 204; the first expansion valve 411 is fully opened, the second expansion valve 421 and the outdoor expansion valve 310 are opened to a preset opening degree, and the first water pump 511 and the second water pump 521 are turned on.

[0068] The refrigerant output from compressor 10 is transported to the first plate heat exchanger 40 for heat exchange via four-way valve 20. After being output from the first plate heat exchanger 40, it is throttled by the second expansion valve 421 and then transported to the second plate heat exchanger 50 for heat exchange. The refrigerant output from the second plate heat exchanger 50 is throttled by the outdoor expansion valve 310 on the fifth main circuit 300 and then transported to the outdoor heat exchanger 30 for heat exchange before being returned to compressor 10.

[0069] After the first water pump 511 is turned on, the water in the first inlet pipe 510 is transported to the first cooling channel 42, where it exchanges heat with the refrigerant in the first cooling channel 41 and is then heated. After that, the water is transported to the corresponding indoor unit for heating through the first outlet pipe 610 and the second water supply branch 720.

[0070] After the second water pump 521 is turned on, the water in the second inlet pipe 520 is transported to the second cooling channel 52, where it exchanges heat with the refrigerant in the second cooling channel 51 and is then cooled. After cooling, the water is transported to the corresponding indoor unit through the second outlet pipe 620 and the second water supply branch 720 for cooling.

[0071] <Cooling as the primary mode> Combination Figure 2 , Figure 3 as well as Figure 8 When cooling is the primary mode, the number of indoor units in heating mode in indoor unit 3 is no greater than the number of indoor units in cooling mode.

[0072] Each indoor unit in cooling mode is connected to the first water supply branch 710 via a three-way valve 70 and the second water supply branch 720 via a three-way valve 70 and the second water supply pipe 520. The corresponding switch valve 80 on the second water supply branch 720 is opened.

[0073] Each indoor unit in heating mode is connected to the first water supply branch 710 via a three-way valve 70 and the second water inlet pipe 520 via a three-way valve 70. The second water supply branch 720 is connected to the second water outlet pipe 620 via a three-way valve 70, and the corresponding switch valve 80 on the second water supply branch 720 is opened.

[0074] The controller controls the four-way valve 20 to connect the first valve port 201 and the fourth valve port 204, and the second valve port 202 and the third valve port 203. The first expansion valve 411 opens to a preset opening degree, and the second expansion valve 421 and the outdoor expansion valve 310 are fully opened. The first water pump 511 and the second water pump 521 are turned on.

[0075] The refrigerant output from the compressor 10 is delivered to the outdoor heat exchanger 30 via the four-way valve 20 for heat exchange. Then, it is delivered to the second plate heat exchanger 50 via the fifth main line 300. After heat exchange in the second plate heat exchanger 50, it is output and, after throttling by the first expansion valve 411, is delivered to the first plate heat exchanger 40 for heat exchange. Finally, it is delivered back to the compressor 10.

[0076] After the first water pump 511 is turned on, the water in the first inlet pipe 510 is transported to the first cooling channel 42, where it exchanges heat with the refrigerant in the first cooling channel 41 and is then cooled. After cooling, the water is transported to the corresponding indoor unit through the first outlet pipe 610 and the second water supply branch 720 for cooling.

[0077] After the second water pump 521 is turned on, the water in the second inlet pipe 520 is transported to the second cooling channel 52, where it exchanges heat with the refrigerant in the second cooling channel 51 and is heated. Then, it is transported to the corresponding indoor unit for heating through the second outlet pipe 620 and the second water supply branch 720.

[0078] Of course, there are also embodiments where the number of indoor units in cooling mode and heating mode are equal. When the number of indoor units in cooling mode and heating mode are equal, the system is preset to activate either heating mode or cooling mode.

[0079] refer to Figure 9 In other embodiments, when switching from heating-main mode to cooling-main mode, the first plate heat exchanger 40 and the second plate heat exchanger 50 need to switch between cooling and heating states. In order to avoid the residual refrigerant in the pipeline affecting the heating and cooling effect of the indoor unit, the controller controls the first water pump 511 and the second water pump 521 to shut down and the heat exchange fan in the indoor unit to shut down.

[0080] The controller controls the first valve port 201 of the four-way valve 20 to switch to connect with the fourth valve port 204, and the second valve port 202 to switch to connect with the third valve port 203.

[0081] After the four-way valve 20 is switched, the compressor 10 continues to run for a first preset time, and then the first water pump 511 and the second water pump 521 are turned on. The first preset time is determined according to the actual situation. After the first preset time, the refrigerant in the heat pump system is switched and transported in a different direction, so that the refrigerant in the first refrigeration channel 41 after the switch is a high-temperature refrigerant and the refrigerant in the second refrigeration channel 51 is a low-temperature refrigerant.

[0082] When the first water pump 511 and the second water pump 521 start pumping, some of the water in the pipes has not yet completed heat exchange, which will cause hot air to be blown into the cooling room and cold air to be blown into the heating room, causing discomfort.

[0083] To solve the above problems, the design is such that when the water temperature in the first cooling channel 42 drops below the first preset temperature and the water temperature in the second cooling channel 52 rises above the second temperature, it means that the water temperature in the water circulation has risen or fallen to the preset temperature. Then, the controller controls the heat exchange fan in the indoor unit to turn on, completing the switching.

[0084] refer to Figure 10 In other embodiments, when switching from cooling-oriented mode to heating-oriented mode, the controller shuts down the first water pump 511 and the second water pump 521, and shuts down the heat exchange fan in the indoor unit.

[0085] The controller controls the first valve port 201 of the four-way valve 20 to switch to connect with the second valve port 202, and the third valve port 203 to connect with the fourth valve port 204. After the four-way valve 20 switches, the compressor 10 continues to run for a second preset time, and then turns on the first water pump 511 and the second water pump 521. The first preset time and the second preset time can be set to be equal, or they can be designed to be unequal according to the actual situation.

[0086] When the water temperature in the first cooling channel 42 rises above the third preset temperature and the water temperature in the second cooling channel 52 drops below the fourth temperature, it means that the water temperature in the water circulation has risen or fallen to the preset temperature. Then, the controller controls the heat exchange fan in the indoor unit to turn on, completing the switching.

[0087] refer to Figure 11 , Figure 12 This application also proposes another heat pump unit, which includes an outdoor unit 1, a water module 2 and an indoor unit 3.

[0088] and Figure 1The structural difference of the heat pump unit is that the outdoor unit 1 includes a compressor 10, an outdoor heat exchanger 30 and three four-way valves. The output end of the compressor 10 is connected to the first valve port 201 of the three four-way valves respectively, the input end of the compressor 10 is connected to the third valve port 203 of the three four-way valves respectively, the fourth valve port 204 of one of the four-way valves is connected to the outdoor heat exchanger 30, and the second valve port 202 of the other two four-way valves is connected to the water module 2.

[0089] For ease of understanding, the three four-way valves are defined as the first four-way valve 21, the second four-way valve 22, and the third four-way valve 23. The output end of the compressor 10 is connected to the first valve port 201 of the first four-way valve 21 through the first main line 110, to the first valve port 201 of the second four-way valve 22 through the second main line 120, and to the first valve port 201 of the third four-way valve 23 through the third main line 130.

[0090] The second valve port 202 of the first four-way valve 21 is in the cut-off state, the third valve port 203 of the first four-way valve 21 is connected to the input end of the compressor 10, and the fourth valve port 204 of the first four-way valve 21 is connected to one end of the outdoor heat exchanger 30 through the fourth main circuit 200.

[0091] The second valve port 202 of the second four-way valve 22 is connected to the second plate heat exchanger 50 in the water module 2, the third valve port 203 of the second four-way valve 22 is connected to the input end of the compressor 10, and the fourth valve port 204 on the second four-way valve 22 is in the cut-off state.

[0092] The second valve port 202 of the third four-way valve 23 is connected to the first plate heat exchanger 40 in the water module 2, the third valve port 203 of the third four-way valve 23 is connected to the input end of the compressor 10, and the fourth valve port 204 on the third four-way valve 23 is in the cut-off state.

[0093] The second valve port 202 of the second four-way valve 22 is connected to the second refrigeration channel, and the second valve port 202 of the third four-way valve 23 is connected to the first refrigeration channel.

[0094] The heat pump unit involved in this application can realize full heating mode, full cooling mode, and simultaneous heating and cooling mode.

[0095] The simultaneous heating and cooling mode includes two modes: heating-focused and cooling-focused.

[0096] Indoor unit 3 has two or more indoor units, each located in a different indoor space.

[0097] In some embodiments, when only a preset number of indoor units in the indoor unit 3 are turned on, and all the turned-on indoor units are in heating or cooling mode, it is only necessary to turn on the first plate heat exchanger 40 or the second plate heat exchanger 50 to meet the heating or cooling requirements.

[0098] For ease of description and understanding, we will describe it as having three indoor units, and define indoor unit group 3 as including the first indoor unit 61, the second indoor unit 62 and the third indoor unit 63.

[0099] The following is a detailed explanation of each mode: <Full Heating Mode> Combination Figure 13 In full heating mode, all indoor units are in heating mode. The first valve port 201 of each four-way valve is connected to the second valve port 202, and the third valve port 203 is connected to the fourth valve port 204. The first expansion valve 411 and the second expansion valve 421 are both fully open, or one of the first expansion valve 411 and the second expansion valve 421 is fully open and the other is fully closed. The outdoor expansion valve 310 opens to a preset opening degree to throttle the refrigerant flowing through it.

[0100] Taking a three-unit indoor unit as an example, when the first indoor unit 61, the second indoor unit 62, and the third indoor unit 63 are all in heating mode, the controller controls the first valve port 201 of the second four-way valve 22 to connect with the second valve port 202, and the third valve port 203 to connect with the fourth valve port 204. The first valve port 201 of the third four-way valve 23 is connected with the second valve port 202, and the third valve port 203 is connected with the fourth valve port 204.

[0101] The first expansion valve 411 on the first extension pipe 410 and the second expansion valve 421 on the second extension pipe 420 are fully open, and the outdoor expansion valve 310 is opened to a preset opening degree to throttle the refrigerant passing through.

[0102] Refrigerant control logic: Part of the refrigerant output from compressor 10 is delivered to the first refrigeration channel 41 via the third four-way valve 23, and the other part is delivered to the second refrigeration channel 51 via the second four-way valve 22.

[0103] After heat exchange in the first refrigeration passage 41 and the second refrigeration passage 51, the refrigerant is transported to the fifth main line 300 through the first extension pipe 410 and the second extension pipe 420 respectively. After being throttled by the outdoor expansion valve 310 on the fifth main line 300, it is transported back to the compressor 10.

[0104] In other words, when the first expansion valve 411 is fully open, the refrigerant passes through the first expansion valve 411 directly without throttling, and only evaporates and absorbs heat through the outdoor expansion valve 310, absorbing heat from the outdoor environment, and then returns to the compressor 10 through the first four-way valve 21.

[0105] Waterway control logic: The first water pump 511 and the second water pump 521 are turned on, and the switch valves 80 on each of the second water supply branches 720 are turned on.

[0106] Driven by the first water pump 511, the water in the first inlet pipe 510 is transported to the first cooling channel 42. After exchanging heat with the high-temperature refrigerant in the first cooling channel 41, the heated water is output from the first outlet pipe 610 and transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the first outlet pipe 610 is transported to the first indoor unit 61 and the second indoor unit 62 through the corresponding three-way valve 70.

[0107] Driven by the second water pump 521, the water in the second inlet pipe 520 is transported to the second cooling channel 52. After exchanging heat with the high-temperature refrigerant in the second cooling channel 51, the heated water is output from the second outlet pipe 620 and transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the second outlet pipe 620 is transported to the third indoor unit 63 through the corresponding three-way valve 70.

[0108] When in full heating mode, the two plate heat exchangers are fully utilized to provide heating according to load requirements, thereby improving the efficiency of the entire system.

[0109] Full Cooling Mode Combination Figure 14 In full cooling mode, all indoor units are in cooling mode. Taking the first indoor unit 61, the second indoor unit 62, and the third indoor unit 63 as examples: The controller controls the first four-way valve 21 to connect its first valve port 201 to its fourth valve port 204, and the second valve port 202 to its third valve port 203; the second four-way valve 22 connects its first valve port 201 to its fourth valve port 204, and its second valve port 202 to its third valve port 203; the third four-way valve 23 connects its first valve port 201 to its fourth valve port 204, and its second valve port 202 to its third valve port 203.

[0110] The first expansion valve 411 on the first extension pipe 410 and the second expansion valve 421 on the second extension pipe 420 are both opened to a preset degree to throttle the passing refrigerant, while the outdoor expansion valve 310 is fully open.

[0111] The indoor units of each cooling mode are switched to connect to the first plate heat exchanger 40 or the second plate heat exchanger 50 via the corresponding three-way valve.

[0112] Refrigerant control logic: The refrigerant output from the compressor 10 is delivered to the outdoor heat exchanger 30 through the first four-way valve 21. In the outdoor heat exchanger 30, it condenses and releases heat to absorb cooling energy from the outdoor environment. The refrigerant output from the outdoor heat exchanger 30 is throttled by the first expansion valve 411 on the first extension pipe 410 and then delivered to the first refrigeration channel 41. The other part of the refrigerant output from the outdoor heat exchanger 30 is delivered to the second refrigeration channel 51 through the intermediate pipe 400 and the second extension pipe 420 and throttled by the second expansion valve 421.

[0113] Finally, the refrigerant output from the first refrigeration channel 41 and the second refrigeration channel 51 is returned to the compressor 10.

[0114] Waterway control logic: The first water pump 511 and the second water pump 521 are turned on, and the switch valves 80 on each of the second water supply branches 720 are turned on.

[0115] Driven by the first water pump 511, the water in the first inlet pipe 510 is transported to the first cooling channel 42. After exchanging heat with the high-temperature refrigerant in the first cooling channel 41, the water temperature decreases. The cooled water is output from the first outlet pipe 610 and transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the first outlet pipe 610 is transported to the first indoor unit 61 and the second indoor unit 62 through the corresponding three-way valve 70.

[0116] Driven by the second water pump 521, the water in the second inlet pipe 520 is transported to the second cooling channel 52. After exchanging heat with the high-temperature refrigerant in the second cooling channel 51, the water temperature decreases, and the cooled water is output from the second outlet pipe 620. It is then transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the second outlet pipe 620 is transported to the third indoor unit 63 through the corresponding three-way valve 70.

[0117] In some embodiments of this application, when the indoor unit load is less than a preset value, only the second plate heat exchanger 50 is activated for cooling. When the capacity of the second plate heat exchanger 50 cannot meet the heating demand, the first plate heat exchanger 40 is activated. The second plate heat exchanger 50 and the first plate heat exchanger 40 both output cold water, making full use of the two plate heat exchangers for cooling and improving the efficiency of the entire system.

[0118] <Heating-Primary Mode> Combination Figure 15 When heating is the primary mode, the number of indoor units in heating mode in indoor unit 3 is greater than the number of indoor units in cooling mode. This applies when the first indoor unit 61 and the second indoor unit 62 are in heating mode and the third indoor unit 63 is in cooling mode.

[0119] The controller controls the first four-way valve 21 to connect its first valve port 201 to its second valve port 202, and its third valve port 203 to its fourth valve port 204; the second four-way valve 22 connects its first valve port 201 to its fourth valve port 204, and its second valve port 202 to its third valve port 203; the third four-way valve 23 connects its first valve port 201 to its second valve port 202, and its third valve port 203 to its fourth valve port 204.

[0120] The first expansion valve 411 on the first extension pipe 410 is fully open, the second expansion valve 421 on the second extension pipe 420 is opened to a preset opening degree, and the outdoor expansion valve 310 is opened to a preset opening degree, so as to throttle the refrigerant passing through.

[0121] Refrigerant control logic: The refrigerant output from the compressor 10 is delivered to the first refrigeration passage 41 through the third four-way valve 23. After passing through the first extension pipe 410, a portion of the refrigerant is delivered to the outdoor heat exchanger 30 through the fifth main line 300. Finally, it is delivered back to the compressor 10 through the first four-way valve 21. Another portion of the refrigerant output from the first extension pipe 410 flows through the intermediate pipe 400 and the second extension pipe 420. After being throttled by the second expansion valve, it is delivered to the second refrigeration passage 51 for heat exchange. Finally, it flows back to the compressor 10 through the second four-way valve 22.

[0122] Waterway control logic: The first water pump 511 and the second water pump 521 are turned on, and the switch valves 80 on each of the second water supply branches 720 are turned on.

[0123] Driven by the first water pump 511, water in the first inlet pipe 510 is transported to the first cooling channel 42. After exchanging heat with the high-temperature refrigerant in the first cooling channel 41, the water temperature rises. The heated water is then output from the first outlet pipe 610 and transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the first outlet pipe 610 is transported to the first indoor unit 61 and the second indoor unit 62 through the corresponding three-way valve 70, thereby achieving heating for the first indoor unit 61 and the second indoor unit 62.

[0124] Driven by the second water pump 521, the water in the second inlet pipe 520 is transported to the second cooling channel 52. After exchanging heat with the high-temperature refrigerant in the second cooling channel 51, the water temperature decreases, and the cooled water is output from the second outlet pipe 620. It is then transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the second outlet pipe 620 is transported to the third indoor unit 63 through the corresponding three-way valve 70.

[0125] The first plate heat exchanger outputs hot water at 40°C, and the second plate heat exchanger outputs cold water at 50°C, achieving heat recovery and meeting the simultaneous cooling and heating needs of different rooms.

[0126] <Cooling as the primary mode> Combination Figure 16 When cooling is the main mode, the number of indoor units in heating mode in indoor unit 3 is no greater than the number of indoor units in cooling mode. Taking the first indoor unit 61 as the heating mode and the second indoor unit 62 and the third indoor unit 63 as the cooling mode as an example.

[0127] The controller controls the first four-way valve 21 to connect its first valve port 201 to its fourth valve port 204, and its second valve port 202 to its third valve port 203; the second four-way valve 22 connects its first valve port 201 to its fourth valve port 204, and its second valve port 202 to its third valve port 203; the third four-way valve 23 connects its first valve port 201 to its second valve port 202, and its third valve port 203 to its fourth valve port 204.

[0128] The first expansion valve 411 and the outdoor expansion valve 310 on the first extension pipe 410 are fully open, and the second expansion valve 421 on the second extension pipe 420 is opened to a preset degree to throttle the refrigerant passing through.

[0129] Refrigerant control logic: Part of the refrigerant output from the compressor 10 is transported to the outdoor heat exchanger 30 through the first four-way valve 21. After heat exchange in the outdoor heat exchanger 30, the refrigerant is transported to the intermediate pipeline 400. Another part of the refrigerant output from the compressor 10 is transported to the first refrigeration channel 41 in the first plate heat exchanger 40 through the third four-way valve 23. After heat exchange in the first refrigeration channel 41, it is transported to the intermediate pipeline 400 through the first extension pipeline 410. The refrigerant in the intermediate pipeline 400 is throttled by the second expansion valve 421 on the second extension pipeline 420 and then delivered to the second refrigeration channel 51.

[0130] Finally, the refrigerant output from the second refrigeration passage 51 flows back to the compressor 10 through the second four-way valve 22.

[0131] Waterway control logic: The first water pump 511 and the second water pump 521 are turned on, and the switch valves 80 on each of the second water supply branches 720 are turned on.

[0132] Driven by the first water pump 511, water in the first inlet pipe 510 is transported to the first cooling channel 42. After exchanging heat with the high-temperature refrigerant in the first cooling channel 41, the water temperature rises. The heated water is then output from the first outlet pipe 610 and transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the first outlet pipe 610 is transported to the first indoor unit 61 and the second indoor unit 62 through the corresponding three-way valve 70, thereby enabling the first indoor unit 61 to heat.

[0133] Driven by the second water pump 521, the water in the second inlet pipe 520 is transported to the second cooling channel 52. After exchanging heat with the high-temperature refrigerant in the second cooling channel 51, the water temperature decreases, and the cooled water is output from the second outlet pipe 620. It is then transported to the corresponding indoor unit through the corresponding three-way valve 70 and the second water supply branch 720. For example, the water in the second outlet pipe 620 is transported to the second indoor unit 62 and the third indoor unit 63 through the corresponding three-way valve 70.

[0134] The first plate heat exchanger 40 is a condenser when it is in full heating, heating-mainly and cooling-mainly, and the water side produces hot water for the indoor unit used for heating. The first plate heat exchanger 40 is an evaporator when in full cooling mode, and its water side produces chilled water for use in the indoor unit for cooling. The second plate heat exchanger 50 is an evaporator when cooling, heating, and full cooling are the main modes of operation. Its water side produces cold water, which is used for the indoor unit for cooling. The second plate heat exchanger 50 acts as a condenser when in full heating mode, and its water side produces hot water for use in the indoor heating unit.

[0135] In some embodiments of this application, in addition to cooling as the primary mode and heating as the primary mode, when the number of indoor units in the indoor unit 3 is equal, there is also an equal cooling and heating mode, that is, the number of indoor units in cooling mode and heating mode is equal.

[0136] In the equal cooling and heating mode, the controller controls the number of indoor units connected to the first plate heat exchanger 40 and the second plate heat exchanger 50 to be consistent.

[0137] The controller controls the first plate heat exchanger 40 to heat and the second plate heat exchanger 50 to cool, and controls an equal number of indoor units to cool and heat respectively.

[0138] In the simultaneous cooling and heating mode, part of the refrigerant flowing through the second refrigeration channel 51 in the second plate heat exchanger 50 is output from the first refrigeration channel 41, which is conducive to realizing the heat recovery of the refrigerant in the first refrigeration channel 41 and improving the energy utilization rate of the refrigerant.

[0139] In some other embodiments of this application, when switching from full heating to heating as the main function, the second plate heat exchanger 50 changes from heating to cooling. Therefore, it needs to be switched according to certain control logic. Otherwise, hot air may blow out of the cooling room, causing discomfort.

[0140] When switching from full heating mode to heating as the main mode, the controller shuts down the second water pump 521. The indoor unit in heating mode is connected to the first plate heat exchanger 40 through the three-way valve 70, and the indoor unit in cooling mode is connected to the second plate heat exchanger 50 through the corresponding three-way valve 70.

[0141] The controller switches the first valve port 201 of the four-way valve connected to the second plate heat exchanger 50 to connect to the fourth valve port 204, and the second valve port 202 to connect to the third valve port 203; the second expansion valve 421 changes from fully open to a preset opening to throttle the refrigerant flowing through it; after the second plate heat exchanger 50 has been running for a first preset time, the controller controls the second water pump 521 to start. When the water temperature at the input end of the second cooling channel 52 drops below the first preset temperature, the controller controls the heat exchange fan of the corresponding indoor unit to start, and the corresponding indoor unit starts cooling.

[0142] When switching from full cooling to cooling as the main function, the first plate heat exchanger 40 changes from cooling to heating. Therefore, it needs to be switched according to a certain control logic. Otherwise, it may cause cold air to blow out of the heated room, causing discomfort.

[0143] When the full cooling mode is switched to the cooling main mode, the controller controls the first water pump 511 to shut down. The indoor unit in cooling mode is connected to the second plate heat exchanger 50 through the three-way valve 70, and the indoor unit in heating mode is connected to the first plate heat exchanger 40 through the corresponding three-way valve 70. The first valve port 201 of the four-way valve connected to the first plate heat exchanger 40 is connected to the second valve port 202, and the third valve port 203 is connected to the fourth valve port 204. The first expansion valve is set to be fully open. After the first plate heat exchanger 40 has been running in cooling mode for a second preset time, the controller controls the first water pump 511 to start. When the water temperature at the input end of the first cooling channel 42 rises above the second preset temperature, the controller controls the heat exchange fan of the corresponding indoor unit to start, and the indoor unit connected to the first plate heat exchanger 40 starts heating mode.

[0144] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0145] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0146] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heat pump unit, characterized in that, include: Outdoor unit; Water module, which includes: The first plate heat exchanger has a first refrigeration channel and a first cooling channel inside. The second plate heat exchanger has a second refrigeration channel and a second cooling channel inside it. Wherein, one end of the first refrigeration channel is connected to the outdoor unit, and the other end is connected to the second refrigeration channel, and the other end of the second refrigeration channel is connected to the outdoor unit; an intermediate pipeline is connected between the first refrigeration channel and the second refrigeration channel, and a first expansion valve and a second expansion valve are provided on the intermediate pipeline, with the first expansion valve close to the first refrigeration channel and the second expansion valve close to the second refrigeration channel; An indoor unit comprising at least two indoor units, each of which is selectively connected to the first cooling aisle and the second cooling aisle; The controller is configured to control the operating state of the first plate heat exchanger and the second plate heat exchanger according to the operating requirements of each of the indoor units, so that the corresponding indoor unit is connected to the first cooling channel or the second cooling channel.

2. The heat pump unit according to claim 1, characterized in that, The outdoor unit includes a compressor, an outdoor heat exchanger, and a four-way valve. The first valve port of the four-way valve is connected to the output end of the compressor through a first main line, the second valve port of the four-way valve is connected to the water module through the first main line, the third valve port of the four-way valve is connected to the input end of the compressor through a third main line, and the fourth valve port of the four-way valve is connected to the outdoor heat exchanger through a fourth main line. The outdoor heat exchanger and the second refrigeration channel are connected by a fifth main line, and an outdoor expansion valve is installed on the fifth main line. A gas-liquid separator is also provided between the compressor and the third valve port.

3. The heat pump unit according to claim 2, characterized in that, Each of the indoor units is connected to the first end of the first cooling aisle via a first water inlet pipe, and to the first end of the second cooling aisle via a second water inlet pipe; Each of the indoor units is connected to the second end of the first cooling aisle via a first water outlet pipe, and to the second end of the second cooling aisle via a second water outlet pipe; A first water pump is installed on the first water inlet pipe, and a second water pump is installed on the second water inlet pipe.

4. The heat pump unit according to claim 3, characterized in that, Each indoor unit has a first water supply branch and a second water supply branch connected to its two ends respectively. The first water supply branch is connected to the first water inlet pipe and the second water inlet pipe through a three-way valve. The second water supply branch is connected to the first water outlet pipeline and the second water outlet pipeline via a three-way valve; A switch valve is installed on the second water supply branch.

5. The heat pump unit according to claim 4, characterized in that, In full heating mode, all indoor units are in heating mode. The controller controls the connection of the first and second valve ports of the four-way valve, and the connection of the third and fourth valve ports. The first and second expansion valves are fully open, the outdoor expansion valve is opened to a preset opening degree, the second water pump is turned off, and the first water pump is turned on. The refrigerant output from the compressor is delivered to the first plate heat exchanger for heat exchange through a four-way valve. After being output from the first plate heat exchanger, it is delivered to the second plate heat exchanger. Then, after being throttled by the outdoor expansion valve on the fifth main line, it is delivered to the outdoor heat exchanger for heat exchange. Finally, it is returned to the compressor. After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel and is heated. Then, it is transported to the corresponding indoor unit for heating through the first outlet pipe and the second water supply branch.

6. The heat pump unit according to claim 4, characterized in that, In full cooling mode, all indoor units are in cooling mode. The controller controls the first and fourth valve ports of the four-way valve to connect, and the second and third valve ports to connect. The first expansion valve opens to a preset opening, and the second expansion valve and the outdoor expansion valve are fully open. The second water pump is turned off, and the first water pump is turned on. The refrigerant output from the compressor is delivered to the outdoor heat exchanger through a four-way valve for heat exchange. Then, it is delivered to the second plate heat exchanger through the fifth main line. After being output from the second plate heat exchanger, it is throttled by the first expansion valve and delivered to the first plate heat exchanger for heat exchange. Finally, it is delivered back to the compressor. After the first water pump is turned on, the water in the first inlet pipe is transported to the first cooling channel, where it exchanges heat with the refrigerant in the first cooling channel to cool down. Then, it is transported to the corresponding indoor unit through the first outlet pipe and the second water supply branch for cooling.

7. The heat pump unit according to claim 5, characterized in that, When heating is the primary mode, the number of indoor units in heating mode is greater than the number of indoor units in cooling mode. The controller controls the connection of the first valve port to the second valve port and the third valve port to the fourth valve port of the four-way valve; the first expansion valve is fully open, the second expansion valve and the outdoor expansion valve are opened to a preset opening degree, and the first water pump and the second water pump are turned on. The refrigerant output from the compressor is delivered to the first plate heat exchanger for heat exchange via a four-way valve. After being output from the first plate heat exchanger, it is throttled by the second expansion valve and then delivered to the second plate heat exchanger for heat exchange. The refrigerant output from the second plate heat exchanger is throttled by the outdoor expansion valve on the fifth main line and then delivered to the outdoor heat exchanger for heat exchange before being returned to the compressor.

8. The heat pump unit according to claim 6, characterized in that, When cooling is the primary mode, the number of indoor units in heating mode should not exceed the number of indoor units in cooling mode. The controller controls the four-way valve to connect the first valve port to the fourth valve port, and the second valve port to the third valve port. The first expansion valve opens to a preset opening degree, and the second expansion valve and the outdoor expansion valve are fully opened. The first water pump and the second water pump are turned on. The refrigerant output from the compressor is delivered to the outdoor heat exchanger via a four-way valve for heat exchange. Then, it is delivered to the second plate heat exchanger via the fifth main line. After heat exchange in the second plate heat exchanger, it is output, throttled by the first expansion valve, and delivered to the first plate heat exchanger for heat exchange. Finally, it is delivered back to the compressor.

9. The heat pump unit according to claim 7, characterized in that, When switching from heating mode to cooling mode, the controller shuts down the first and second water pumps and the heat exchange fan in the indoor unit. The controller also switches the first port of the four-way valve to connect with the fourth port and the second port to connect with the third port. After the four-way valve switches, the compressor continues to run for a first preset time before turning on the first and second water pumps. When the water temperature in the first cooling channel drops below the first preset temperature and the water temperature in the second cooling channel rises above the second preset temperature, the controller turns on the heat exchange fan in the indoor unit.

10. The heat pump unit according to claim 8, characterized in that, When switching from cooling-primary mode to heating-primary mode, the controller shuts down the first and second water pumps and the heat exchange fan in the indoor unit. The controller also switches the first valve port of the four-way valve to connect with the second valve port and the third valve port to connect with the fourth valve port. After the four-way valve switches, the compressor continues to run for a second preset time before turning on the first and second water pumps. When the water temperature in the first cooling channel rises above the third preset temperature and the water temperature in the second cooling channel drops below the fourth temperature, the controller turns on the heat exchange fan in the indoor unit.

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