Heat pump unit

Abstract

The utility model discloses a heat pump unit which comprises a refrigerant loop formed by connecting a compressor, a first water-cooling heat exchanger, a second heat exchanger set, a four-way valve and a gas-liquid separator. The second heat exchanger group comprises an air side heat exchanger which is connected between the four-way valve and the first water-cooling heat exchanger through a first pipeline; the second water-cooling heat exchanger is connected between the four-way valve and the first water-cooling heat exchanger through a second pipeline; the control valve is arranged on the first pipeline and the second pipeline; the controller is in control connection with the control valve and is used for controlling connection and disconnection of the first pipeline and the second pipeline; in the first refrigeration mode, the controller controls the first pipeline to be disconnected and the second pipeline to be connected; in the heating mode, the controller controls the first pipeline to be connected and the second pipeline to be disconnected. According to the heat pump unit, water cooling and air heat exchange are combined, and the high-energy-efficiency refrigerating and heating effects are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat pump technical field, concretely relates to an improvement of heat pump unit structure. BACKGROUND

[0002] The air-cooled heat pump (cold water) unit is flexible in application and is applicable to most outdoor occasions, but the energy efficiency of the unit under refrigeration working condition is poorer than that of the water-cooled unit; the water-cooled heat pump (cold water) unit has high refrigeration energy efficiency, but needs an additional heat source when heating, and the application scene is first limited.

[0003] According to the change of market application demand, the application environment and the application scene of many heat pump units are no longer limited to single refrigeration or single heating, for example, for central heating projects, it is no longer limited to heating, and some projects also have demand for cooling, and higher requirements for high energy efficiency of the air-cooled unit are also put forward.

[0004] Therefore, the existing single air-cooled heat pump unit or water-cooled heat pump unit cannot meet the use demand of high energy efficiency refrigeration and heating. INVENTION CONTENTS

[0005] In view of the above technical problems pointed out in the background art, a heat pump unit is provided, which combines water-cooled heat exchange and air heat exchange, and realizes the effects of efficient refrigeration and heating.

[0006] In some embodiments of the present application, a heat pump unit comprises:

[0007] A refrigerant circuit is formed by connecting a compressor, a first water-cooled heat exchanger, a second heat exchanger group, a four-way valve and a gas-liquid separator;

[0008] The second heat exchanger group comprises:

[0009] An air-side heat exchanger is connected between the four-way valve and the first water-cooled heat exchanger through a first pipeline;

[0010] A second water-cooled heat exchanger is provided in parallel with the air-side heat exchanger and is connected between the four-way valve and the first water-cooled heat exchanger through a second pipeline;

[0011] A control valve is arranged on the first pipeline and the second pipeline;

[0012] A controller is connected to the control valve and is used to control the on-off of the first pipeline and the second pipeline;

[0013] The heat pump unit has a first refrigeration mode and a heating mode.

[0014] When the heat pump unit is in the first refrigeration mode, the controller controls the first pipeline to be disconnected and the second pipeline to be connected, and a first refrigeration cycle loop is formed among the compressor, the four-way valve, the second water-cooled heat exchanger, the first water-cooled heat exchanger and the gas-liquid separator.

[0015] When the heat pump unit is in the heating mode, the controller controls the first pipeline to be connected and the second pipeline to be disconnected, and a heating cycle loop is formed among the compressor, the first water-cooled heat exchanger, the air-side heat exchanger, the four-way valve and the gas-liquid separator.

[0016] The above embodiment has the following advantages and effects:

[0017] When the heat pump unit is in the refrigeration mode, the second water-cooled heat exchanger and the first water-cooled heat exchanger are arranged in parallel, and the first pipeline is controlled to be disconnected, so that the refrigerant circulates and refrigerates in cooperation with the second water-cooled heat exchanger and the first water-cooled heat exchanger, and the refrigeration heat exchange mode is the same as that of the water-cooled heat pump unit, and high-efficiency refrigeration is achieved.

[0018] When the heat pump unit is in the heating mode, the second water-cooled heat exchanger is not involved in the circulation, and the air-side heat exchanger and the first water-cooled heat exchanger cooperate to circulate the refrigerant between the air-side heat exchanger and the first water-cooled heat exchanger, and the air-side heat exchanger is used for heat exchange during evaporation, so that the heat exchange mode is the same as that of the air-cooled heat pump unit, high-efficiency heating is achieved, and the structure of the heat pump unit can simultaneously meet the requirements of refrigeration and heating, and high-efficiency refrigeration and heating are achieved.

[0019] In some embodiments of the present application, a supercooler is configured to:

[0020] When the heat pump unit is in the first refrigeration mode, the supercooler is connected between the second water-cooled heat exchanger and the first water-cooled heat exchanger, and is used for cooling the refrigerant flowing out of the second water-cooled heat exchanger.

[0021] When the heat pump unit is in the heating mode, the supercooler is connected between the first water-cooled heat exchanger and the air-side heat exchanger, and is used for cooling the refrigerant flowing out of the first water-cooled heat exchanger.

[0022] The above embodiment has the following advantages and effects:

[0023] By arranging the supercooler in the heat pump unit, the refrigerant flowing out of the second water-cooled heat exchanger can be further cooled by the supercooler when the heat pump unit is in the first refrigeration mode, the temperature of the refrigerant is further reduced, and high-efficiency refrigeration is achieved.

[0024] When the heat pump unit is in the heating mode, the refrigerant of the first water-cooled heat exchanger is further cooled by the supercooler, the temperature of the refrigerant is reduced, and high-efficiency heating is achieved.

[0025] In some embodiments of the present application, the supercooler is configured with a supercooler refrigerant flow path passing through the inside thereof, having an inlet portion and an outlet portion;

[0026] A total connection pipeline is connected with the first pipeline and the second pipeline;

[0027] A first connection pipeline is connected with the total connection pipeline and the inlet portion of the supercooler refrigerant flow path, and a first control valve is arranged on the first connection pipeline;

[0028] A second connection pipeline is connected between the first water-cooled heat exchanger and the outlet portion of the supercooler refrigerant flow path, and a second control valve is arranged on the second connection pipeline.

[0029] The above-mentioned embodiments have the following advantages and effects:

[0030] Through the cooperation of the first connection pipeline, the first control valve arranged on the first connection pipeline, the second connection pipeline, the second control valve arranged on the second connection pipeline, and the control valve piece switching the first pipeline and the second pipeline, when the unit is in the first refrigeration operation mode, the refrigerant can be limited to circulate along the compressor, the four-way valve, the first water-cooled heat exchanger, and the second water-cooled heat exchanger, so as to realize the effect of high-efficiency refrigeration.

[0031] In some embodiments of the present application, the following are included:

[0032] A third connection pipeline is connected between the first water-cooled heat exchanger and the inlet portion of the supercooler refrigerant flow path, and a third control valve and a high-pressure liquid storage tank are arranged on the third connection pipeline;

[0033] A fourth connection pipeline is connected on the outlet portion of the supercooler refrigerant flow path and the first connection pipeline, and a fourth control valve is arranged on the fourth connection pipeline;

[0034] A fifth control valve is arranged at a position between the connection point of the first pipeline and the total connection pipeline and the connection point of the second pipeline and the total connection pipeline, for limiting the flow direction of the refrigerant to flow into the air-side heat exchanger.

[0035] The above-mentioned embodiments have the following advantages and effects:

[0036] Through the cooperation of the third connection pipeline, the third control valve arranged on the third connection pipeline, the fourth connection pipeline, the fourth control valve, the fifth control valve, and the control valve piece switching the first pipeline and the second pipeline, when the unit is in the heating mode operation, the refrigerant can be limited to circulate along the compressor, the four-way valve, the first water-cooled heat exchanger, and the air-side heat exchanger, so as to realize the effect of high-efficiency heating.

[0037] In some embodiments of the present application, a first throttling device is arranged on the supercooler refrigerant flow path close to the outlet portion side;

[0038] A branch flow path having one end connected to the supercooler refrigerant flow path between the first throttling device and the supercooler and one end connected to the supercooler, and having a second throttling device provided in the branch flow path;

[0039] A compressor suction gas return circuit having one end connected to the suction side of the compressor and one end connected to the supercooler.

[0040] The above embodiments have the following advantages and effects:

[0041] The refrigerant flowing through the supercooler refrigerant flow path exchanges heat with the refrigerant that is branched from the supercooler refrigerant flow path, throttled by the second throttling device, and returned to the supercooler, thereby further cooling the refrigerant in the supercooler refrigerant flow path, further reducing the temperature of the refrigerant, and achieving high energy efficiency of refrigeration or heating.

[0042] In addition, the refrigerant after heat exchange in the supercooler enters the discharge chamber of the compressor, thereby reducing the discharge temperature of the compressor and improving the heating capacity of the unit.

[0043] In some embodiments of the present application, the air-side heat exchanger is connected to the total connection pipeline through a first pipeline;

[0044] The control valve assembly includes:

[0045] The electric control valve is arranged on the side of the first pipeline close to the total connection pipeline.

[0046] The first one-way valve is arranged on the first pipeline between the air-side heat exchanger and the electric control valve, and is used to limit the flow of refrigerant out of the air-side heat exchanger.

[0047] The second one-way valve is connected in parallel with the first one-way valve and the electric control valve through a branch pipeline connected to the first pipeline, and is used to limit the flow of refrigerant into the air-side heat exchanger.

[0048] The above embodiments have the following advantages and effects:

[0049] The electric control valve and the first one-way valve are matched to avoid the leakage of refrigerant in the air-side heat exchanger into the total connection pipeline.

[0050] At the same time, the arrangement of the second one-way valve can also prevent the refrigerant in the second water-cooled heat exchanger from entering the air-side heat exchanger, and prevent the refrigerant from participating in the circulation in the air-side heat exchanger.

[0051] The matching of the first one-way valve, the second one-way valve, and the electric control valve can avoid the leakage of refrigerant in the air-side heat exchanger, and by using the existing simple valve assembly, the production cost of the entire heat pump unit can be reduced.

[0052] In some embodiments of the present application, a branch pipe is connected in parallel to the first pipe, and a three-way control valve is arranged at the junction of the branch pipe and the first pipe close to the side of the total connection pipe.

[0053] When the three valve ports of the three-way control valve are closed, leakage of refrigerant can be avoided, and when heating is performed, the three-way control valve can be controlled to be turned on.

[0054] The above embodiments have the following advantages and effects:

[0055] The three-way control valve can prevent refrigerant from entering and flowing out of the air-side heat exchanger, and the single three-way valve structure simplifies the overall piping structure of the heat pump unit.

[0056] In some embodiments of the present application, the heat pump unit has a second refrigeration mode, and when the heat pump unit is in the second refrigeration mode, the control valve controls the first pipe to be turned on and the second pipe to be turned off, forming a second refrigeration cycle loop between the compressor, the four-way valve, the air-side heat exchanger, the first water-cooled heat exchanger, and the gas-liquid separator.

[0057] The above embodiments have the following advantages and effects:

[0058] The heat pump unit is provided with two parallel heat exchangers, an air-source heat exchanger and a second water-cooled heat exchanger, and when the second water-cooled heat exchanger fails, the air-side heat exchanger can be controlled to replace the second water-cooled heat exchanger to participate in the refrigeration cycle, serving as a backup for the second water-cooled heat exchanger, ensuring the reliability of the unit operation.

[0059] In some embodiments of the present application, the control valve comprises:

[0060] The first valve controls the on-off of the first pipe;

[0061] The second valve controls the on-off of the second pipe;

[0062] During refrigeration operation, the first valve is closed and the second valve is turned on,

[0063] During heating operation, the first valve is turned on and the second valve is closed.

[0064] The above embodiments have the following advantages and effects:

[0065] The first control valve and the second control valve are arranged to control the on-off of the first pipe and the second pipe, so as to select the air-side heat exchanger and the second water-cooled heat exchanger participating in the cycle, ensuring the high energy efficiency of the heat pump unit during refrigeration or heating.

[0066] In some embodiments of the present application, the control valve comprises:

[0067] The first valve port is connected with the four-way valve through a refrigerant pipeline;

[0068] The second valve port is connected with the first pipeline;

[0069] The third valve port is connected with the second pipeline;

[0070] In the refrigeration mode, the first valve port and the second pipeline are connected;

[0071] In the heating mode, the first valve port and the first pipeline are connected.

[0072] The above embodiment has the following advantages and effects:

[0073] By setting a control valve connected to the four-way valve, the first pipeline and the second pipeline, and by switching the valve port of the control valve, the on-off control of the first pipeline and the second pipeline is realized, and the pipeline structure of the entire heat pump unit is simplified.

[0074] Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0075] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0076] Figure 1 It is a structural schematic diagram of one embodiment of the heat pump unit according to the embodiment;

[0077] Figure 2 It is a refrigerant flow schematic diagram of one embodiment of the heat pump unit according to the embodiment in the first refrigeration mode;

[0078] Figure 3 It is a refrigerant flow schematic diagram of one embodiment of the heat pump unit according to the embodiment in the heating mode;

[0079] Figure 4 It is a structural schematic diagram of one embodiment of the heat pump unit according to the embodiment;

[0080] Figure 5 It is a refrigerant flow schematic diagram of one embodiment of the heat pump unit according to the embodiment in the first refrigeration mode;

[0081] Figure 6Fig. 2 is a schematic view of a refrigerant flow direction of a heat pump unit according to an embodiment in a first refrigeration cycle mode;

[0082] Figure 7 Fig. 3 is a schematic view of a refrigerant flow direction of a heat pump unit according to an embodiment in a heating cycle mode;

[0083] Figure 8 Fig. 4 is a schematic view of a refrigerant flow direction of a heat pump unit according to an embodiment in a heating cycle mode;

[0084] Figure 9 Fig. 5 is a schematic view of a structure of a subcooler refrigerant flow path and a split flow path of a subcooler of a heat pump unit according to an embodiment;

[0085] Figure 10 Fig. 6 is a schematic view of a structure of a refrigerant flow direction of a heat pump unit according to an embodiment in a second refrigeration cycle mode.

[0086] Reference Signs:

[0087] Wherein, 110, compressor; 120, first water-cooled heat exchanger; 130, four-way valve; 140, gas-liquid separator; 150, air-side heat exchanger; 160, second water-cooled heat exchanger; 170, control valve; 171, first valve; 172, second valve; 180, first pipeline; 181, branch pipeline; 190, second pipeline; 200, subcooler; 210, subcooler refrigerant flow path; 211, inlet portion; 212, outlet portion; 220, split flow path; 230, compressor supplement air circuit; 300, total connection pipeline; 410, first connection pipeline; 411, first control valve; 420, second connection pipeline; 421, second control valve; 430, third connection pipeline; 431, third control valve; 432, high-pressure liquid storage tank; 440, fourth connection pipeline; 441, fourth control valve; 450, fifth control valve; 510, first throttling device; 520, second throttling device; 610, electric control valve; 620, first check valve; 630, second check valve. DETAILED DESCRIPTION

[0088] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For simplicity of the disclosure, the description below refers to the components of a particular example by a specific reference number. This does not limit the present application, which is applicable to other examples and embodiments. Moreover, the disclosure can refer to a number and / or letter in different examples, which is for the purpose of simplification and clarity and does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0094] In some embodiments of the present application, a heat pump unit is proposed, referring to Figure 1 as shown, comprising:

[0095] The refrigerant circuit is formed by connecting the compressor 110, the first water-cooled heat exchanger 120, the second heat exchanger group, the four-way valve 130 and the gas-liquid separator 140.

[0096] The first water-cooled heat exchanger 120 is a first plate heat exchanger, in which the refrigerant circuit coolant and the water flow in the first heat exchange water pipeline flow, and the water flow and the coolant exchange heat in the first water-cooled heat exchanger 120.

[0097] The first heat exchange water pipeline can be connected to a water tank and a water pump, for water supply and driving the circulation of water flow in the first heat exchange water pipeline.

[0098] In order to realize the detection of the inlet water temperature and the outlet water temperature, the first inlet water temperature sensor and the first outlet water temperature sensor are arranged on the first heat exchange water pipeline.

[0099] The second heat exchanger group comprises:

[0100] The air-side heat exchanger 150 is connected between the four-way valve 130 and the first water-cooled heat exchanger 120 through the first pipeline 180.

[0101] The air-side heat exchanger 150 is a fin heat exchanger, which can exchange heat with air.

[0102] In order to increase the heat exchange effect of the air-side heat exchanger 150, a heat exchange fan is arranged at the air-side heat exchanger 150, which is used to drive the flow of air flow and accelerate the heat exchange of the air-side heat exchanger 150.

[0103] The second heat exchanger group comprises a second water-cooled heat exchanger 160, which is arranged in parallel with the air-side heat exchanger 150, and is connected between the four-way valve 130 and the first water-cooled heat exchanger 120 through the second pipeline 190.

[0104] The second water-cooled heat exchanger 160 is a second plate heat exchanger, and refrigerant of a refrigerant circuit and water flow in a second heat exchange water pipeline flow inside the second water-cooled heat exchanger 160, and the water flow and the refrigerant exchange heat inside the second water-cooled heat exchanger 160.

[0105] The air-side heat exchanger 150 and the second water-cooled heat exchanger 160 are arranged in parallel between the four-way valve 130 and the first water-cooled heat exchanger 120, and in actual operation of the unit, the air-side heat exchanger 150 or the second water-cooled heat exchanger 160 can be selectively opened according to actual refrigeration or heating demand to participate in circulation.

[0106] The control valve 170 is arranged on the first pipeline and the second pipeline.

[0107] The controller is connected to the control valve and is used for controlling opening and closing of the first pipeline 180 and the second pipeline 190.

[0108] By controlling opening and closing of the first pipeline 180 and the second pipeline 190, whether the air-side heat exchanger 150 and the second water-cooled heat exchanger 160 connected to the first pipeline 180 participate in system circulation can be controlled.

[0109] The heat pump unit has a first refrigeration mode and a heating mode.

[0110] In the first refrigeration mode, the controller controls the control valve 170 to disconnect the first pipeline 180 and connect the second pipeline 190, and a first refrigeration circulation loop is formed between the compressor 110, the four-way valve 130, the second water-cooled heat exchanger 160, the first water-cooled heat exchanger 120 and the gas-liquid separator 140.

[0111] Referring to Figure 2 The flow process of refrigerant in the first refrigeration mode is as follows:

[0112] After being discharged from the compressor 110, the refrigerant enters the four-way valve 130, and then enters the second water-cooled heat exchanger 160 to exchange heat with cooling water, and the high-temperature and high-pressure gaseous refrigerant becomes medium-temperature and medium-pressure liquid refrigerant, which enters the first water-cooled heat exchanger 120 through the filter, and the refrigerant entering the second water-cooled heat exchanger 160 exchanges heat with water flow in a second heat exchange water pipeline inside the second water-cooled heat exchanger 160, the second heat exchange water pipeline can be a user-side water pipeline, the refrigerant entering the second water-cooled heat exchanger 160 to exchange heat becomes low-pressure and high-temperature gaseous refrigerant, and finally returns to the compressor 110 through the four-way valve 130 and the gas-liquid separator 140, to complete a refrigerant circulation.

[0113] In the first refrigeration mode operation process, the heat exchange between the refrigerant flowing out of the compressor 110 and the outside is carried out by the water cooling mode of the first water-cooled heat exchanger 120 and the second water-cooled heat exchanger 160, and the completely water-cooled heat exchange mode has higher refrigeration efficiency than the air heat exchange mode, thereby realizing high-energy-efficiency refrigeration.

[0114] In the heating mode, the controller controls the control valve 170 to act, so that the first pipeline 180 is turned on and the second pipeline 190 is turned off, thereby forming a heating cycle circuit among the compressor 110, the first water-cooled heat exchanger 120, the air-side heat exchanger 150, the four-way valve 130 and the gas-liquid separator 140.

[0115] Referring to Figure 3 As shown, the flow process of the refrigerant in the heating mode operation is as follows:

[0116] After coming out of the compressor 110, the refrigerant enters the four-way valve 130, and then enters the first water-cooled heat exchanger 120 to exchange heat with the water pipeline inside the device, i.e. the user-side water source, so that the high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and medium-pressure liquid refrigerant. After passing through the filter, the refrigerant enters the air-side heat exchanger 150 to exchange heat with the air source, so that the refrigerant becomes a low-pressure and high-temperature gaseous refrigerant. Finally, the refrigerant returns to the compressor 110 through the four-way valve 130 and the gas-liquid separator 140, thereby completing a heating refrigerant cycle.

[0117] In the entire heating cycle process, the cooling heat exchange of the refrigerant is carried out by the first water-cooled heat exchanger 120 and the user-side water source, and the evaporation heat exchange is carried out by the air-side heat exchanger 150 and the air source. The air-cooled heat exchange mode has higher heating efficiency than the water-cooled heat exchange mode, thereby realizing high-energy-efficiency heating.

[0118] The above embodiment has the following advantages and effects:

[0119] In the structure of the heat pump unit, the air-side heat exchanger 150 and the second water-cooled heat exchanger 160 are arranged in parallel. When the unit operates in the refrigeration mode, the first pipeline 180 is controlled to be closed, so that the second water-cooled heat exchanger 160 and the first water-cooled heat exchanger 120 cooperate to circulate the refrigeration. The refrigeration heat exchange mode is carried out by the water-cooled heat exchange mode, which is consistent with the heat exchange mode of the water-cooled heat pump unit, thereby realizing high-energy-efficiency refrigeration.

[0120] In heating, the second water-cooled heat exchanger 160 can be controlled not to participate in the circulation, and the air-side heat exchanger 150 and the first water-cooled heat exchanger 120 are used in cooperation, so that the refrigerant circulates between the air-side heat exchanger 150 and the first water-cooled heat exchanger 120. In the evaporation heat exchange, heat exchange is carried out through the air-side heat exchanger 150, so that the heat exchange mode remains consistent with that of the air-cooled heat pump unit, realizing high-energy-efficiency heating of the unit. The structure of the entire heat pump unit can simultaneously consider refrigeration and heating, achieving high-energy-efficiency refrigeration and heating effects.

[0121] In some embodiments of the present application, referring to Figure 4 The heat pump unit comprises a supercooler 200 configured to:

[0122] When the heat pump unit is in the first refrigeration mode, the supercooler 200 is connected between the second water-cooled heat exchanger 160 and the first water-cooled heat exchanger 120, and is used to cool the refrigerant flowing out of the second water-cooled heat exchanger 160.

[0123] Referring to Figure 6 , 7 When the first refrigeration mode is running, the gaseous refrigerant at high temperature and high pressure changes into liquid refrigerant at medium temperature and medium pressure after heat exchange with water in the second water-cooled heat exchanger 160, enters the supercooler 200 through the filter, and is cooled again after heat exchange in the supercooler 200. The refrigerant is cooled again after heat exchange in the supercooler 200, and is throttled and depressurized by the first throttling device 510 connected to the supercooler 200, so that the refrigerant changes from liquid at medium temperature and medium pressure into liquid refrigerant at low temperature and low pressure. The liquid refrigerant at low temperature and low pressure reenters the first water-cooled heat exchanger 120, and then returns to the compressor 110.

[0124] After the refrigerant flowing out of the second water-cooled heat exchanger 160 is cooled by the supercooling effect of the supercooler 200, the temperature of the refrigerant is further reduced, improving the refrigeration effect.

[0125] In some embodiments of the present application, the supercooler 200 is configured to: when the heat pump unit is in the heating mode, the supercooler 200 is connected between the first water-cooled heat exchanger 120 and the air-side heat exchanger 150, and is used to cool the refrigerant flowing out of the first water-cooled heat exchanger 120.

[0126] Referring to Figure 8 , 9As shown, during the heating mode operation, the refrigerant entering the first water-cooled heat exchanger 120 is changed from high-temperature and high-pressure gaseous refrigerant to medium-temperature and medium-pressure liquid refrigerant after heat exchange with the first heat exchange water pipeline flowing through the inside thereof, enters the inside of the subcooler 200 after passing through the filter to perform heat exchange, the refrigerant after heat exchange of the subcooler 200 is cooled again, is throttled and depressurized by the first throttling device 510 connected with the subcooler 200, the refrigerant is changed from medium-temperature and medium-pressure liquid to low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant enters the air-side heat exchanger 150, is changed to low-pressure and high-temperature gaseous refrigerant after heat exchange with the air source, and finally returns to the compressor 110 through the four-way valve 130 and the gas-liquid separator 140.

[0127] After the refrigerant flowing out after heat exchange from the first water-cooled heat exchanger 120 is cooled by the subcooler 200, the temperature of the refrigerant is further reduced, and heating in a low-temperature environment is realized.

[0128] In some embodiments of the present application, the subcooler 200 is configured with a subcooler refrigerant flow path 210 flowing through the inside thereof, and the subcooler refrigerant flow path 210 has an inlet portion 211 and an outlet portion 212.

[0129] The inlet portion 211 is an inlet for introducing refrigerant.

[0130] The outlet portion 212 is an outlet for leading refrigerant out of the subcooler refrigerant flow path 210.

[0131] The total connection pipeline 300 is connected with the second water-cooled heat exchanger 160 and the air-side heat exchanger 150.

[0132] The inlet portion 211 is closer to the total connection pipeline 300 than the outlet portion 212.

[0133] The first connection pipeline 410 is connected with the total connection pipeline 300 and the inlet portion 211 of the subcooler refrigerant flow path 210, and the first control valve 411 is arranged on the first connection pipeline 410.

[0134] The second connection pipeline 420 is connected between the first water-cooled heat exchanger 120 and the outlet portion 212 of the subcooler refrigerant flow path 210, and the second control valve 421 is arranged on the second connection pipeline 420.

[0135] Reference Figure 4As shown, when the first refrigeration mode is running, the refrigerant from the compressor 110 enters the four-way valve 130, then enters the second water-cooled heat exchanger 160 to exchange heat with cooling water, and the high-temperature and high-pressure gaseous refrigerant becomes medium-temperature and medium-pressure liquid refrigerant. The refrigerant flows out of the second water-cooled heat exchanger 160, enters the total connecting pipeline 300, flows into the first connecting pipeline 410 from the total connecting pipeline 300, enters the inlet portion 211 of the supercooler refrigerant flow path 210 from the first connecting pipeline 410, flows through the supercooler 200, flows out of the outlet portion 212, enters the second connecting pipeline 420, enters the first water-cooled heat exchanger 120 from the second connecting pipeline 420, and flows back to the compressor 110 through the four-way valve 130 and the gas-liquid separator 140.

[0136] The first control valve 411 is a first one-way valve 620, which is used to limit the refrigerant flowing out of the total connecting pipeline 300 to flow along the first connecting pipeline 410.

[0137] The second control valve 421 is a second one-way valve 630, which is used to limit the refrigerant flowing out of the outlet portion 212 to flow into the first water-side heat exchanger.

[0138] The above embodiment has the following advantages and effects:

[0139] By setting the first connecting pipeline 410, the first control valve 411 on the first connecting pipeline 410, the second connecting pipeline 420, the second control valve 421, and the control valve 170 switching the first pipeline 180 and the second pipeline 190, the refrigerant can be limited to circulate along the compressor 110, the four-way valve 130, the first water-cooled heat exchanger 120, and the second water-cooled heat exchanger 160 when the unit is in the first refrigeration mode, so as to achieve the effect of high-efficiency refrigeration.

[0140] In some embodiments of the present application, there are:

[0141] The third connecting pipeline 430 is connected between the outlet of the first water-cooled heat exchanger 120 and the inlet portion 211 of the supercooler refrigerant flow path 210, and the third control valve 431 and the high-pressure liquid storage tank 432 are arranged on the third connecting pipeline 430.

[0142] The fourth connecting pipeline 440 is connected between the outlet portion 212 of the supercooler refrigerant flow path 210 and the first connecting pipeline 410, and the fourth control valve 441 is arranged on the fourth connecting pipeline 440.

[0143] The fifth control valve 450 is arranged at a position between the connection point of the first pipeline and the total connecting pipeline and the connection point of the second pipeline and the total connecting pipeline, and is used to limit the flow direction of the refrigerant to flow into the air-side heat exchanger 150.

[0144] Referring toFigure 8 As shown, during the heating mode operation, the refrigerant from the compressor 110 enters the four-way valve 130, and then enters the first water-cooled heat exchanger 120 to exchange heat with the cooling water. The high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and medium-pressure liquid refrigerant. The refrigerant flows out of the first water-cooled heat exchanger 120, enters the third connecting pipeline 430, and flows through the high-pressure liquid storage tank 432. The refrigerant flowing out of the third connecting pipeline 430 enters the supercooler 200 at the inlet portion 211 of the refrigerant pipeline, flows through the supercooler 200, and then flows out of the outlet portion 212, enters the fourth connecting pipeline 440, and then enters the total connecting pipeline 300. The refrigerant flows out of the total connecting pipeline 300, enters the air-side heat exchanger 150, and then flows back to the compressor 110 through the four-way valve 130 and the gas-liquid separator 140.

[0145] The high-pressure liquid storage tank 432 is configured to store high-pressure liquid to balance the amount of refrigerant used for refrigeration and heating.

[0146] The third control valve 431 is a third one-way valve configured to limit the flow direction of the refrigerant in the third connecting pipeline 430.

[0147] The fourth control valve 441 is a fourth one-way valve configured to limit the flow direction of the refrigerant flowing out of the outlet portion 212 in the fourth connecting pipeline 440.

[0148] In some embodiments of the present application, the flow direction of the refrigerant limited by the first control valve 411 is opposite to the flow direction of the refrigerant limited by the third control valve 431.

[0149] The first connecting pipeline 410 and the third connecting pipeline 430 are both connected to the inlet portion 211 of the supercooler refrigerant flow path 210. The refrigerant flowing into the inlet portion 211 from the first connecting pipeline 410 cannot flow into the third connecting pipeline 430 due to the flow direction limitation of the third control valve 431.

[0150] Similarly, the refrigerant flowing into the inlet portion 211 from the third connecting pipeline 430 cannot flow into the first connecting pipeline 410 due to the flow direction limitation of the first control valve 411.

[0151] The fifth control valve 450 is a fifth one-way valve configured to limit the refrigerant flowing into the total connecting pipeline 300 from flowing into the second water-cooled heat exchanger, so as to ensure that the refrigerant can enter the air-side heat exchanger 150.

[0152] The above embodiments have the following advantages and effects:

[0153] By setting the third connecting pipeline 430, the third control valve 431 on the third connecting pipeline 430, the fourth connecting pipeline 440, the fourth control valve 441, the fifth control valve 450, and the control valve piece 170 switching the first pipeline 180 and the second pipeline 190, the refrigerant can be circulated along the compressor 110, the four-way valve 130, the first water-cooled heat exchanger 120, and the air-side heat exchanger 150 when the unit is in the heating mode, so as to realize the effect of efficient heating.

[0154] Referring to Figure 8 , Figure 10 As shown in the drawings, in some embodiments of the present application, a first throttling device 510 is arranged on the supercooler refrigerant flow path 210 close to the outlet 212 side, and the first throttling device 510 is a first electronic expansion valve.

[0155] A shunt flow path 220 is connected to the supercooler refrigerant flow path 210 between the first throttling device 510 and the supercooler 200 at one end, and is connected to the supercooler 200 at one end, and a second throttling device 520 is arranged on the shunt flow path 220, and the second throttling device 520 is a second electronic expansion valve.

[0156] A compressor supplementing circuit 230 is connected to the suction side of the compressor 110 at one end and connected to the supercooler 200 at one end.

[0157] The refrigerant flowing out of the first water-cooled heat exchanger 120 or the second water-cooled heat exchanger flows through the supercooler refrigerant flow path 210, and part of the refrigerant in the supercooler refrigerant flow path 210 enters the refrigerant circuit to participate in circulation, and the other part is shunted to the shunt flow path 220, and after being throttled and reduced in pressure by the second throttling device 520, it flows into the supercooler 200 again, exchanges heat with the refrigerant in the supercooler refrigerant flow path 210 to reduce the temperature of the refrigerant in the supercooler refrigerant flow path 210 again, and the refrigerant flowing out of the supercooler 200 enters the suction side of the compressor 110 through the compressor supplementing circuit 230.

[0158] The above-mentioned embodiments have the following advantages and effects:

[0159] The refrigerant flowing through the supercooler refrigerant flow path 210 exchanges heat with the refrigerant shunted from the supercooler refrigerant flow path 210 and flowing back to the supercooler 200 after being throttled by the second throttling device 520, which can further cool the refrigerant in the supercooler refrigerant flow path 210 and further reduce the temperature of the refrigerant.

[0160] In addition, the refrigerant after heat exchange in the supercooler enters the exhaust cavity of the compressor, reducing the exhaust temperature of the compressor, and thereby improving the heating capacity of the unit.

[0161] Referring to Figure 7As shown, in some embodiments of the present application, the air-side heat exchanger 150 is connected through the first pipe 180 and the total connecting pipe 300;

[0162] The control valve assembly comprises:

[0163] The electric control valve 610 is an electromagnetic valve, which is arranged on the first pipe 180 close to the side of the total connecting pipe 300;

[0164] The first one-way valve 620 is arranged on the first pipe 180 between the air-side heat exchanger 150 and the electric control valve 610;

[0165] The second one-way valve 630 is connected in parallel on the first pipe 180 through the branch pipe 181 between the first one-way valve 620 and the electric control valve 610, wherein the valve direction of the second one-way valve 630 is opposite to that of the first one-way valve 620.

[0166] The above-mentioned embodiments have the following advantages and effects:

[0167] The cooperation of the electric control valve 610 and the first one-way valve 620 can avoid the leakage of the refrigerant in the air-side heat exchanger 150 into the total connecting pipe 300;

[0168] Meanwhile, the arrangement of the second one-way valve 630 can also avoid the refrigerant in the second water-cooled heat exchanger 160 from entering the air-side heat exchanger 150, so as to avoid the refrigerant in the air-side heat exchanger 150 from participating in the circulation.

[0169] The cooperation of the first one-way valve 620, the second one-way valve 630 and the electric control valve 610 can avoid the leakage of the refrigerant in the air-side heat exchanger 150, and by using the existing simple valve assembly, the production cost of the entire heat pump unit can be reduced.

[0170] In some embodiments of the present application, referring to Figure 10 As shown, the heat pump unit has a second refrigeration mode, when the heat pump unit is in the second refrigeration mode, the controller controls the control valve 170 to act, so that the first pipe 180 is turned on and the second pipe 190 is turned off, forming a second refrigeration circulation loop between the compressor 110, the four-way valve 130, the air-side heat exchanger 150, the first water-cooled heat exchanger 120 and the gas-liquid separator 140.

[0171] When the second water-cooled heat exchanger 160 fails, the air-side heat exchanger 150 can also be used to replace the second water-cooled heat exchanger 160 to participate in the refrigeration cycle, so as to ensure the reliable operation of the unit.

[0172] When the second refrigeration mode is operated, the control valve 170 controls the first pipeline 180 to be connected and the second pipeline 190 to be disconnected, so that the air-side heat exchanger 150 is connected to the refrigerant circuit. At this time, the refrigerant from the compressor 110 enters the four-way valve 130, and then enters the air-side heat exchanger to exchange heat with the air source. The high-temperature and high-pressure gaseous refrigerant becomes a medium-temperature and medium-pressure liquid refrigerant. The heat-exchanged refrigerant enters the first water-cooled heat exchanger 120 to exchange heat with the first heat exchange water pipeline. The heat-exchanged refrigerant becomes a low-temperature and low-pressure gaseous refrigerant, and finally enters the compressor 110 through the four-way valve 130 and the gas-liquid separator 140.

[0173] The above embodiment has the following advantages and effects:

[0174] The heat pump unit is provided with two parallel heat exchangers of the air source heat exchanger and the second water-cooled heat exchanger 160. When the second water-cooled heat exchanger 160 fails, the air-side heat exchanger 150 can be controlled to replace the second water-cooled heat exchanger 160 to participate in the refrigeration cycle, as a backup of the second water-cooled heat exchanger 160, to ensure the reliability of the unit operation.

[0175] Referring to Figures 1-3 In some embodiments of the present application, the control valve 170 comprises:

[0176] The first valve 171 is used to control the connection and disconnection of the first pipeline 180.

[0177] The second valve 172 is used to control the connection and disconnection of the second pipeline 190.

[0178] When the refrigeration is operated, the first valve 171 is closed, and the second valve 172 is connected,

[0179] When the heating is operated, the first valve 171 is connected, and the second valve 172 is closed.

[0180] The first valve 171 is a two-way electric ball valve, and the second valve 172 is a two-way electric ball valve.

[0181] The simple valve structure of the two-way electric ball valve can reduce the production cost of the entire heat pump unit.

[0182] The above embodiment has the following advantages and effects:

[0183] Through the cooperation of the first valve 171 and the second valve 172, the connection and disconnection of the first pipeline 180 and the second pipeline 190 can be controlled, so as to realize the selection of the air-side heat exchanger 150 and the second water-cooled heat exchanger participating in the cycle, to ensure the high energy efficiency of the heat pump unit in refrigeration or heating.

[0184] In some embodiments of the present application, referring toFigure 6 As shown, the control valve 170 includes:

[0185] A first valve port, connected to the four-way valve 130 through the refrigerant pipeline;

[0186] A second valve port, connected to the first pipeline 180;

[0187] A third valve port, connected to the second pipeline 190;

[0188] During refrigeration operation, the first valve port and the second pipeline 190 are connected;

[0189] During heating operation, the first valve port and the first pipeline 180 are connected.

[0190] The control valve 170 is a three-way valve, which can be connected to the four-way valve 130, the first pipeline 180 and the second pipeline 190, and the control of the connection or disconnection of the first pipeline 180 and the second pipeline 190 is realized by switching the connection or disconnection of the different valve ports of the three-way valve.

[0191] The above embodiments have the following advantages and effects:

[0192] By setting a control valve 170 connected to the four-way valve 130, the first pipeline 180 and the second pipeline 190, and realizing the control of the connection or disconnection of the first pipeline 180 and the second pipeline 190 by switching the valve ports of the control valve 170, the pipeline structure of the entire heat pump unit is simplified.

[0193] In some embodiments of the present application, the heat pump unit includes:

[0194] An exhaust temperature sensor arranged at the exhaust side of the compressor for detecting the exhaust temperature of the compressor;

[0195] An ambient temperature sensor for detecting the ambient temperature;

[0196] A charge air temperature sensor for detecting the charge air temperature of the compressor;

[0197] High pressure sensor, low pressure sensor and other sensors, through the above sensors, the pressure and temperature parameters of the refrigerant of the heat pump unit can be monitored in real time, to ensure the normal operation of the heat pump unit.

[0198] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0199] The above merely is the specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heat pump unit, characterized by The heat pump unit comprises: a refrigerant circuit formed by connecting a compressor, a first water-cooled heat exchanger, a second heat exchanger group, a four-way valve and a gas-liquid separator; the second heat exchanger group comprises: an air-side heat exchanger connected between the four-way valve and the first water-cooled heat exchanger through a first pipeline; a second water-cooled heat exchanger connected in parallel with the air-side heat exchanger and connected between the four-way valve and the first water-cooled heat exchanger through a second pipeline; a control valve arranged on the first pipeline and the second pipeline; a controller connected to the control valve for controlling the opening and closing of the first pipeline and the second pipeline; wherein the heat pump unit has a first refrigeration mode and a heating mode; when the heat pump unit is in the first refrigeration mode, the controller controls the first pipeline to be closed and the second pipeline to be opened, and a first refrigeration cycle circuit is formed between the compressor, the four-way valve, the second water-cooled heat exchanger, the first water-cooled heat exchanger and the gas-liquid separator; when the heat pump unit is in the heating mode, the controller controls the first pipeline to be opened and the second pipeline to be closed, and a heating cycle circuit is formed between the compressor, the first water-cooled heat exchanger, the air-side heat exchanger, the four-way valve and the gas-liquid separator.

2. The heat pump unit according to claim 1, comprising: a subcooler configured to: when the heat pump unit is in the first refrigeration mode, the subcooler is connected between the second water-cooled heat exchanger and the first water-cooled heat exchanger to cool the refrigerant flowing out of the second water-cooled heat exchanger; when the heat pump unit is in the heating mode, the subcooler is connected between the first water-cooled heat exchanger and the air-side heat exchanger to cool the refrigerant flowing out of the first water-cooled heat exchanger.

3. The heat pump unit according to claim 2, wherein: the subcooler is configured with a subcooler refrigerant flow path passing through the inside of the subcooler, the subcooler refrigerant flow path having an inlet portion and an outlet portion; a total connection pipeline connected to the first pipeline and the second pipeline; a first connection pipeline connected to the total connection pipeline and the inlet portion, and provided with a first control valve on the first connection pipeline; a second connection pipeline connected between the first water-cooled heat exchanger and the outlet portion, and provided with a second control valve on the second connection pipeline. comprising:

4. The heat pump unit of claim 3, wherein, a third connection pipeline connected between the first water-cooled heat exchanger and the inlet portion, and provided with a third control valve and a high-pressure liquid storage tank on the third connection pipeline; a fourth connection pipeline connected between the outlet portion and the first connection pipeline, and provided with a fourth control valve on the fourth connection pipeline; a fifth control valve arranged at a position between a connection point of the first pipeline and the total connection pipeline and a connection point of the second pipeline and the total connection pipeline, for limiting the flow direction of the refrigerant to flow into the air-side heat exchanger.

5. The heat pump unit according to claim 3, wherein: a first throttling device is arranged on the subcooler refrigerant flow path close to the outlet portion side; a split flow path is connected at one end to the subcooler refrigerant flow path between the first throttling device and the subcooler, and connected at one end to the subcooler, and provided with a second throttling device on the split flow path; a compressor supplementing circuit connected at one end to the suction side of the compressor and connected at one end to the subcooler.

6. The heat pump unit according to claim 3, wherein: ​ The air side heat exchanger is connected with the first pipe and the total connecting pipe; The control valve assembly comprises: An electric control valve is arranged on the first pipe close to the total connecting pipe; A first one-way valve is arranged on the first pipe between the air side heat exchanger and the electric control valve, and is used for limiting the flow of refrigerant out of the air side heat exchanger; A second one-way valve is connected with the first one-way valve and the electric control valve in parallel through a branch pipe connected with the first pipe, and is used for limiting the flow of refrigerant into the air side heat exchanger.

7. The heat pump unit according to claim 3, wherein A branch pipe is connected in parallel with the first pipe, and a three-way control valve is arranged at the intersection of the branch pipe close to the total connecting pipe and the first pipe.

8. The heat pump unit according to claim 1, wherein The heat pump unit has a second refrigeration mode, when the heat pump unit is in the second refrigeration mode, the control valve controls the first pipe to be connected and the second pipe to be disconnected, and a second refrigeration cycle loop is formed among the compressor, the four-way valve, the air side heat exchanger, the first water-cooled heat exchanger and the gas-liquid separator.

9. The heat pump unit according to claim 1, wherein The control valve comprises: A first valve for controlling the connection and disconnection of the first pipe; A second valve for controlling the connection and disconnection of the second pipe; When the refrigeration is running, the first valve is closed and the second valve is connected, When the heating is running, the first valve is connected and the second valve is closed.

10. The heat pump unit according to claim 1, wherein The control valve comprises: A first valve port connected with the four-way valve through a refrigerant pipe; A second valve port connected with the first pipe; A third valve port connected with the second pipe; When the refrigeration is running, the first valve port and the second pipe are connected; When the heating is running, the first valve port and the first pipe are connected.

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