Heat pump system

Abstract

The utility model provides a heat pump system. The heat pump system comprises an economizer, an evaporator and a flow dividing device, the flow dividing device is connected with a main path of the economizer, an auxiliary path of the economizer and the evaporator, and the flow dividing device is used for dividing refrigerants flowing out of the evaporator to the main path of the economizer and the auxiliary path of the economizer during refrigeration. The auxiliary path and the evaporator are used for shunting the refrigerant flowing out of the economizer to the economizer during heating; according to the heat pump system, when the heat pump heats or refrigerates, under the condition that refrigerants flowing into the flow dividing device are in the liquid state or the gas-liquid two-phase state, it can be ensured that the auxiliary path effectively takes liquid, so that the gas supplementing efficiency of the heat pump system is improved, and the energy efficiency ratio of the heat pump system is increased.

Description

Technical Field

[0001] This application belongs to the field of heat pump technology, and specifically relates to a heat pump system. Background Technology

[0002] A refrigerant injection enthalpy-increasing heat pump system is a type of heat pump system that improves compressor efficiency and overall system performance by introducing refrigerant gas with a higher enthalpy value into the compressor's injection port. Liquid extraction, a key step in achieving enthalpy enhancement, primarily involves introducing a portion of the refrigerant liquid from the main outlet (or inlet) of the economizer into the auxiliary expansion valve for throttling and pressure reduction. Subsequently, the refrigerant in the auxiliary circuit enters the economizer, where it exchanges heat with the main circuit refrigerant. The liquid refrigerant in the auxiliary circuit absorbs heat, turns into a gas, and is then drawn into the compressor's injection port, thereby increasing the compressor's suction volume. The main circuit refrigerant is cooled by the auxiliary circuit refrigerant, becoming a subcooled liquid, which can more effectively absorb heat.

[0003] However, when the refrigerant flowing out of the main outlet (or inlet) of the economizer is in a gas-liquid two-phase state, the auxiliary circuit may only be able to obtain a small amount of gaseous refrigerant, resulting in low gas replenishment efficiency of the heat pump system and thus reducing the system's energy efficiency ratio. Utility Model Content

[0004] This application provides a heat pump system to solve the problems of low gas replenishment efficiency and low energy efficiency of existing gas replenishment enthalpy-increasing heat pump systems.

[0005] In a first aspect, this application provides a heat pump system, including: an economizer and an evaporator, the heat pump system further including:

[0006] A diversion device is connected to the main circuit of the economizer, the auxiliary circuit of the economizer, and the evaporator, respectively, so as to divert the refrigerant flowing out of the evaporator to the main circuit and the auxiliary circuit of the economizer during cooling, and / or, during heating, to divert the refrigerant flowing out of the economizer to the auxiliary circuit and the evaporator.

[0007] In some embodiments, the diversion device includes a diversion housing, which has a diversion cavity, a main port for connecting the main circuit of the economizer, an auxiliary port for connecting the auxiliary circuit of the economizer, and a connecting port for connecting the evaporator. The main port, the auxiliary port, and the connecting port are respectively connected to the diversion cavity.

[0008] In some embodiments, the main port is disposed above the auxiliary port.

[0009] In some embodiments, the auxiliary port is disposed at the bottom of the diversion housing, and the main port is disposed on the side wall of the diversion housing.

[0010] In some embodiments, the connecting port is located above the main port and the auxiliary port.

[0011] In some embodiments, the main port is provided with a main pipe for connecting the main circuit of the economizer on the outside, the auxiliary port is provided with an auxiliary pipe for connecting the auxiliary circuit of the economizer on the outside, and the connecting port is provided with a connecting pipe for connecting the evaporator on the outside. The auxiliary pipe is arranged perpendicular to the main pipe, and the connecting pipe is arranged perpendicular to the main pipe.

[0012] In some embodiments, the structure of the diversion shell is any one of cylindrical, cubic, spiral, or funnel-shaped.

[0013] In some embodiments, the main port is located at or above the height center of the diversion housing.

[0014] In some embodiments, the main pipe is arranged in a direction parallel to the cross-section of the diversion device, and the inner wall of the diversion housing is provided with a guide groove, which is arranged in a direction parallel to the extension of the main pipe.

[0015] In some embodiments, the heat pump system further includes a compressor and a four-way valve, wherein the compressor, the four-way valve, the evaporator, the flow divider, and the economizer are connected in sequence; the economizer is connected to the compressor.

[0016] It also includes a condenser, one end of which is connected to the four-way valve, and the other end of which is connected to the economizer. The heat pump system provided in this application includes an economizer, an evaporator, and a distribution device. The distribution device is connected to the main circuit of the economizer, the auxiliary circuit of the economizer, and the evaporator, respectively, to divert refrigerant flowing from the evaporator to the main circuit and the auxiliary circuit of the economizer during cooling, and / or, to divert refrigerant flowing from the economizer to the auxiliary circuit and the evaporator during heating. By adding this distribution device between the economizer and the evaporator, the refrigerant flowing from the evaporator or condenser first passes through the distribution device, splitting the refrigerant in two, and causing more liquid refrigerant to flow to the outlet at the bottom of the distribution device. Thus, during heat pump heating or cooling, even when the refrigerant flowing into the distribution device is in a liquid or gas-liquid two-phase state, the auxiliary circuit can preferentially take liquid, thereby improving the gas replenishment efficiency of the heat pump system and increasing the energy efficiency ratio of the heat pump system. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 This is a schematic diagram of the heat pump system provided in this application;

[0019] Figure 2 Schematic diagram of the diversion device provided in this application Figure 1 ;

[0020] Figure 3 Schematic diagram of the diversion device provided in this application Figure 2 .

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Compressor; 2-Four-way valve; 3-Condenser; 4-Econverter; 5-Distributor; 6-Evaporator; 7-Refrigeration main valve; 8-Heating main valve; 9-Auxiliary valve;

[0023] 11-Exhaust port; 12-Main air port; 13-Air inlet; 14-First gas-liquid separator; 15-Second gas-liquid separator;

[0024] 41 - Main road of Economizer 4; 42 - Auxiliary road of Economizer 4;

[0025] 51-Diverter housing; 52-Main pipe; 53-Auxiliary pipe; 54-Connecting pipe;

[0026] 511-Diverter cavity; 512-Main port; 513-Auxiliary port; 514-Connecting port; 515-Guide channel.

[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] 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, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] There are two methods for liquid extraction in existing gas-fuel-injection heat pump systems: upstream liquid extraction and downstream liquid extraction. Upstream liquid extraction involves separating a portion of liquid refrigerant from the high-pressure refrigerant at the condenser outlet before the main inlet of the economizer and introducing it into the auxiliary expansion valve for throttling and pressure reduction. Downstream liquid extraction refers to introducing a portion of liquid refrigerant from the main outlet of the economizer into the auxiliary expansion valve for throttling and pressure reduction.

[0036] Taking downstream liquid intake as an example, the refrigerant liquid in the main circuit passes directly through the economizer, with part entering the evaporator and part entering the auxiliary circuit. The refrigerant in the auxiliary circuit enters the economizer after being throttled and depressurized by the expansion valve, where it exchanges heat with the refrigerant in the main circuit. The refrigerant liquid in the auxiliary circuit absorbs heat and turns into gas, which is then drawn into the auxiliary air inlet of the compressor. The refrigerant in the main circuit releases heat and turns into subcooled liquid, with part entering the evaporator through the expansion valve and part entering the auxiliary circuit.

[0037] However, regardless of whether the liquid is drawn from the downstream or upstream, the refrigerant flowing out of the main outlet (or inlet) of the economizer may be in a two-phase state of gas and liquid. In this case, the auxiliary circuit may only be able to draw a small amount of gaseous refrigerant, resulting in a very low gas replenishment efficiency of the heat pump system and a low energy efficiency ratio of the system.

[0038] In view of this, this application proposes a heat pump system. By setting a diversion device in the heat pump system, the diversion device is connected to the main circuit of the economizer, the auxiliary circuit of the economizer, and the evaporator respectively. During cooling, the refrigerant flowing out of the evaporator is diverted to the main circuit and the auxiliary circuit of the economizer. During heating, the refrigerant flowing out of the economizer is diverted to the auxiliary circuit and the evaporator. This heat pump system ensures that liquid is taken from the auxiliary circuit when the refrigerant flowing into the diversion device is in a liquid state or a gas-liquid two-phase state during heat pump heating or cooling, thereby improving the gas replenishment efficiency of the heat pump system and thus improving the energy efficiency ratio of the heat pump system.

[0039] The technical solutions of this application and how they solve the aforementioned technical problems are described in detail below with specific embodiments. These specific embodiments can be implemented independently or in combination with each other. Identical or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the structure of a heat pump provided in an embodiment of this application, as shown below. Figure 1 As shown, the heat pump system provided in this embodiment includes an economizer 4, an evaporator 6, and a diversion device 5. The diversion device 5 is connected to the main circuit 41 of the economizer 4, the auxiliary circuit 42 of the economizer 4, and the evaporator 6, respectively, so that during cooling, the refrigerant flowing out of the evaporator 6 is diverted to the main circuit 41 and the auxiliary circuit 42 of the economizer 4, and / or, during heating, the refrigerant flowing out of the economizer 4 is diverted to the auxiliary circuit 42 and the evaporator 6.

[0041] Among them, the economizer 4 is a heat exchange device with two flow channels inside, namely the auxiliary path 42 of the economizer 4 and the main path 41 of the economizer 4. The auxiliary path 42 of the economizer 4 is used to absorb the heat of the refrigerant in the main path 41 of the economizer 4, thereby cooling the refrigerant in the main path 41 of the economizer 4.

[0042] Because the refrigerant flows in different directions in the system when the heat pump system is operating in heating and cooling modes, the distribution device 5 is used to allocate the refrigerant flowing into it to different paths according to the heat pump's operating mode (cooling or heating). Furthermore, during heat pump cooling, the refrigerant flowing out of the evaporator 6 is distributed by the distribution device 5 before entering the economizer 4; while during heat pump heating, the refrigerant flows out of the economizer 4 before entering the distribution device 5 for distribution.

[0043] It can be seen that the heat pump adopts a downstream liquid extraction method in the auxiliary circuit during the heating cycle, while adopts an upstream liquid extraction method in the auxiliary circuit during the cooling cycle. Furthermore, whether it is heating or cooling, the auxiliary circuit can be given priority in liquid extraction when the refrigerant flowing into the diversion device 5 is in a gas-liquid two-phase state.

[0044] The heat pump system provided in this embodiment, by setting up a diversion device, which is connected to the main circuit of the economizer, the auxiliary circuit of the economizer, and the evaporator respectively, diverts the refrigerant flowing out of the evaporator to the main circuit and the auxiliary circuit of the economizer during cooling, and / or diverts the refrigerant flowing out of the economizer to the auxiliary circuit and the evaporator during heating; thus, it ensures that the auxiliary circuit can effectively extract liquid during heat pump heating or cooling, thereby improving the gas replenishment efficiency of the heat pump system and improving the energy efficiency ratio of the heat pump system.

[0045] The specific structure and working principle of the diversion device 5 will be explained below.

[0046] Figure 2 Schematic diagram of the structure of the diversion device provided in the embodiments of this application Figure 1 , Figure 3 Schematic diagram of the structure of the diversion device provided in the embodiments of this application Figure 2 ,and Figure 2 This is the rear view of the diversion device, and Figure 3 This is a cross-sectional view of the diversion device from a frontal perspective.

[0047] See Figure 2 and Figure 3 In some embodiments, the diversion device 5 includes a diversion housing 51, which is provided with a diversion cavity 511, a main port 512 for connecting the main path 41 of the economizer 4, an auxiliary port 513 for connecting the auxiliary path 42 of the economizer 4, and a connecting port 514 for connecting the evaporator 6. The main port 512, the auxiliary port 513, and the connecting port 514 are respectively connected to the diversion cavity 511.

[0048] The distribution housing 51 is used to contain and manage the flow of refrigerant. Specifically, the distribution housing 51 is provided with a distribution cavity 511 for collecting and distributing refrigerant, as well as a main port 512, an auxiliary port 513, and a connecting port 514 connected to the distribution cavity 511. Furthermore, the main port 512 and the connecting port 514 can both serve as the inlet and outlet of the distribution device 5. When different operating modes of the heat pump cause different flow directions of the refrigerant in the system, the main port 512 and the connecting port 514 are used for the refrigerant to flow in or out, respectively.

[0049] Specifically, in the cooling mode of the heat pump operation, the refrigerant flowing out of the evaporator 6 enters the distribution chamber 511 through the connecting port 514, flows to the main path 41 of the economizer 4 through the main port 512, and flows into the auxiliary path 42 of the economizer 4 through the auxiliary port 513; in the heating mode of the heat pump operation, the refrigerant flowing out of the economizer 4 flows into the distribution chamber 511 through the main port 512, flows into the auxiliary path 42 of the economizer 4 through the auxiliary port 513, and flows to the evaporator 6 through the connecting port 514.

[0050] In some embodiments, the main port 512 is disposed above the auxiliary port 513.

[0051] Understandably, the main inlet 512 is positioned above the auxiliary inlet 513. The purpose of this is that when the heat pump is operating in cooling mode, the refrigerant flowing into the distribution chamber 511 from the connecting port 514 can preferentially flow into the auxiliary inlet 513 due to gravity, ensuring that the auxiliary circuit 42 of the economizer 4 takes liquid preferentially, and then flows into the main circuit 41 of the economizer 4 through the main inlet 512, which is higher than the auxiliary inlet 513. When the heat pump is operating in heating mode, the refrigerant flowing into the distribution chamber 511 from the main inlet 512 can also preferentially flow into the auxiliary inlet 513 due to gravity, ensuring that the auxiliary circuit 42 of the economizer 4 takes liquid preferentially.

[0052] In some embodiments, the auxiliary port 513 is disposed at the bottom of the diversion housing 51, and the main port 512 is disposed on the side wall of the diversion housing 51.

[0053] The auxiliary port 513 is located at the bottom of the distribution housing 51 to make full use of the gravity of the refrigerant in the distribution cavity 511. Furthermore, whether heating or cooling, if the refrigerant entering the distribution cavity 511 is in a gas-liquid two-phase state, gravity can help the liquid refrigerant sink naturally and the gaseous refrigerant rise naturally, thereby solving the problem that the auxiliary circuit cannot effectively extract liquid in the prior art.

[0054] In addition, the main port 512 is located on the side wall of the distribution housing 51 so that when heating, the refrigerant entering the distribution cavity 511 through the main port 512 can move towards the cavity wall of the distribution cavity 511 based on the centrifugal force and gravity acting on the refrigerant. The centrifugal force helps the liquid refrigerant move towards the cavity wall of the distribution cavity 511, while the gaseous refrigerant moves towards the center, thereby making the refrigerant flow downward more effectively into the auxiliary path 42 of the economizer 4.

[0055] In some embodiments, the connecting port 514 is disposed above the main port 512 and the auxiliary port 513.

[0056] Understandably, during heat pump heating, the refrigerant's gravity and centrifugal force allow more liquid refrigerant to flow downwards to the auxiliary port 513, while another portion of liquid refrigerant or gas-liquid two-phase refrigerant flows upwards and into the evaporator 6 via the connecting port 514. During heat pump cooling, the refrigerant's gravity ensures that the liquid refrigerant can flow downwards to the auxiliary port 513, allowing the auxiliary path to preferentially collect liquid, and another portion of liquid refrigerant or gas-liquid two-phase refrigerant flows into the main path 41 of the economizer 4 via the main port 512.

[0057] Optionally, the connection port 514 can also be located on the side wall of the diversion housing 51, as long as the connection port 514 is higher than the main port 512.

[0058] The heat pump system provided in this embodiment has a distribution chamber inside the distribution housing of the distribution device. The distribution chamber is connected to the main port of the main circuit connecting to the economizer, the auxiliary port of the auxiliary circuit connecting to the economizer, and the connecting port connecting to the evaporator. The main port is located above the auxiliary port, the connecting port is located above the main port and the auxiliary port, the auxiliary port is located at the bottom of the distribution housing, and the main port is located on the side wall of the distribution housing. This heat pump system enables the auxiliary circuit to preferentially take liquid even when the refrigerant flowing into the distribution device is in a liquid state or a gas-liquid two-phase state, thereby improving the gas replenishment efficiency of the heat pump system and improving the energy efficiency ratio of the heat pump system.

[0059] Please continue reading. Figure 2 and Figure 3 In some embodiments, the main port 512 is provided with a main pipe 52 for connecting the main road 41 of the economizer 4 on the outside, the auxiliary port 513 is provided with an auxiliary pipe 53 for connecting the auxiliary road 42 of the economizer 4 on the outside, and the connecting port 514 is provided with a connecting pipe 54 for connecting the evaporator 6 on the outside. The auxiliary pipe 53 is arranged perpendicular to the main pipe 52, and the connecting pipe 54 is arranged perpendicular to the main pipe 52.

[0060] By setting the main pipe 52 outside the main port 512, the auxiliary pipe 53 outside the auxiliary port 513, and the connecting pipe 54 outside the connecting port 514 in a vertical layout, the gas-liquid separation effect can be achieved by utilizing the gravity and centrifugal force of the refrigerant, thereby enabling the auxiliary circuit 42 of the economizer 4 to preferentially collect liquid; and while reducing the system resistance, it can also reduce the pipe vibration when the refrigerant rushes into the diversion device 5, thus reducing the system noise.

[0061] In some embodiments, the structure of the flow divider housing 51 is any one of a cylinder, a cube, a spiral, or a funnel. Among them, the internal space of a cylinder is more uniform, which helps to reduce turbulence of the refrigerant fluid inside the flow divider cavity 511, making the refrigerant flow more smoothly.

[0062] In some embodiments, the main port 512 is located at or above the height center of the distribution housing 51. This not only enables effective liquid intake of the auxiliary circuit but also reduces mutual interference between pipes, thereby controlling the effective distribution of refrigerant.

[0063] Optionally, the position of the main port 512 can be set at different heights based on the different refrigerant flow requirements of the main and auxiliary circuits in the heat pump system during refrigeration. This application does not impose any special restrictions on the specific position of the main port 512.

[0064] In some embodiments, the main pipe 52 is arranged in a direction parallel to the cross-section of the diversion device 5, and the inner wall of the diversion housing 51 is provided with a guide groove 515, which is arranged in a direction parallel to the extension of the main pipe 52.

[0065] The main pipe 52 is arranged in a direction parallel to the cross section of the distribution device 5, which can ensure that the refrigerant is evenly distributed when it enters the distribution chamber 511, and can effectively utilize the centrifugal force when the refrigerant rushes into the distribution chamber 511.

[0066] When the heat pump is heating, the guide channel 515 can laterally guide the refrigerant entering the distribution chamber 511 from the main port 512, allowing it to flow downward along the inner wall of the distribution shell 51 under the action of centrifugal force, so that the refrigerant can flow into the auxiliary path 42 of the economizer 4 from the auxiliary port 513. When the heat pump is cooling, the guide channel 515 can laterally guide the refrigerant to flow towards the main port 512, so that the refrigerant flows into the main path 41 of the economizer 4 more smoothly, reducing the impact and noise on the system.

[0067] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a compressor 1 and a four-way valve 2, wherein the compressor 1, the four-way valve 2, the evaporator 6, the flow divider 5 and the economizer 4 are connected in sequence; the economizer 4 is connected to the compressor 1.

[0068] It also includes: a condenser 3, one end of which is connected to the four-way valve 2, and the other end of which is connected to the economizer 4. To avoid... Figure 1 In the heat pump system of the embodiment, due to the addition of the diversion device 5, the auxiliary circuit 42 of the economizer 4 draws excessive liquid, which impacts the heat pump system. At the same time, it is necessary to ensure that the auxiliary circuit 42 of the economizer 4 draws sufficient liquid to achieve the effect of replenishing gas and increasing enthalpy. Therefore, in some embodiments, the refrigerant flow rate in the system can be adjusted by setting the main cooling valve 7, the main heating valve 8, and the auxiliary valve 9 to maintain the stable operation of the system and improve the energy efficiency ratio of the entire system.

[0069] Please continue reading. Figure 1 The main refrigeration valve 7 is located between the condenser 3 and the economizer 4, and is used to control the refrigerant flow rate into the condenser 3 when the heat pump is refrigerating. The main heating valve 8 is located between the evaporator 6 and the distribution device 5, and is used to control the refrigerant flow rate into the evaporator 6 when the heat pump is heating. The auxiliary valve 9 is located between the auxiliary port 513 of the distribution device 5 and the inlet of the auxiliary line 42 of the economizer 4. Therefore, the auxiliary valve 9 is used to control the refrigerant flow rate into the auxiliary line 42 of the economizer 4 when the heat pump is refrigerating or heating.

[0070] Here, the main cooling valve 7, the main heating valve 8, and the auxiliary valve 9 can be, for example, electronic expansion valves.

[0071] The refrigeration cycle process of the heat pump system provided in this embodiment will be described in detail below:

[0072] Please see Figure 1 ,when Figure 1When the heat pump is in cooling mode, the heating main valve 8 is fully open, and the refrigerant flow rate in the system is regulated by the cooling main valve 7 and auxiliary valve 9. At this time, high-temperature and high-pressure refrigerant gas is discharged from the exhaust port 11 of the compressor 1 and flows into the evaporator 6 through the four-way valve 2. In the evaporator 6, it exchanges heat with the outdoor air to form medium-temperature and high-pressure refrigerant vapor. The medium-temperature and high-pressure refrigerant vapor enters the distribution device 5 from the connection port 514 and is divided into two parts in the distribution device 5: one flows to the auxiliary path 42 of the economizer 4, and the other flows to the main path 41 of the economizer 4.

[0073] At this time, the refrigerant flows into the diversion device 5 from top to bottom. Due to gravity, more liquid refrigerant can flow from the auxiliary port 513 of the diversion device 5 into the economizer 4, and be throttled by the auxiliary valve 9 into low-temperature and low-pressure refrigerant. After the low-temperature and low-pressure refrigerant flows into the auxiliary circuit 42 of the economizer 4, it exchanges heat with the main circuit 41 of the economizer 4. After absorbing the temperature of the refrigerant in the main circuit 41 of the economizer 4 and becoming a gas, it enters the gas injection port 12 of the compressor 1.

[0074] The refrigerant flowing to the main circuit flows out from the main port 512 of the diversion device 5, passes through the main circuit 41 of the economizer 4 and flows into the economizer 4. Inside the economizer 4, it is cooled by the refrigerant in the auxiliary circuit 42 of the economizer 4 and then flows to the main refrigeration valve 7. After being throttled into a low-temperature and low-pressure refrigerant by the main refrigeration valve 7, it flows into the condenser 3 and exchanges heat with the water circuit in the condenser 3 to cool the water circuit. After that, it flows from the condenser 3 to the four-way valve 2. After passing through the first gas-liquid separator 14 to separate the gaseous refrigerant and the liquid refrigerant, the gaseous refrigerant enters the air inlet 13 of the compressor 1. Inside the compressor 1, it mixes with the make-up gas and is compressed by the compressor 1 into a high-temperature and high-pressure gas and discharged through the exhaust port 11 of the compressor 1. This cycle repeats continuously.

[0075] The heating cycle process of the heat pump system provided in this embodiment will be described in detail below:

[0076] Please continue reading. Figure 1 ,when Figure 1 When the heat pump is in heating mode, the main cooling valve 7 is fully open. The main heating valve 8 and the auxiliary valve 9 regulate the refrigerant flow rate in the system. At this time, the high-temperature and high-pressure refrigerant gas is discharged from the exhaust port 11 of the compressor 1 and flows into the condenser 3 through the four-way valve 2. In the condenser 3, the high-temperature and high-pressure refrigerant vapor exchanges heat with the water circuit and becomes low-temperature and high-pressure refrigerant after heating the water circuit. It flows into the economizer 4 and exchanges heat with the auxiliary circuit 42 of the economizer 4 to cool down. Then it flows into the distribution device 5 from the main port 512 of the distribution device 5.

[0077] Specifically, the centrifugal force and gravity of the refrigerant during inflow make the cooled liquid refrigerant flow downward more easily, entering the auxiliary path 42 of the economizer 4 from the auxiliary port 513 of the diversion device 5, ensuring that the auxiliary path takes liquid first, while the refrigerant that does not flow into the auxiliary path flows upward to the evaporator 6.

[0078] The refrigerant flowing out through the auxiliary port 513 of the diverter 5 is throttled into a low-temperature, low-pressure refrigerant fluid by the auxiliary valve 9. Then, it flows through the economizer 4, is heated and turns into a gas, and enters the compressor 1 through the gas supply port 12. The refrigerant flowing upward through the connecting port 514 of the diverter 5 is throttled into a low-temperature, low-pressure refrigerant fluid in the heating main valve 8. The low-temperature, low-pressure refrigerant fluid enters the evaporator 6 and exchanges heat with the air. After absorbing heat from the air, the refrigerant passes through the four-way valve 2 and the second gas-liquid separator 15, and then enters the compressor 1 through the air inlet 13. The two fluids mix in the compressor 1 and are compressed into a high-temperature, high-pressure gas by the compressor 1 and discharged through the exhaust port 11 of the compressor 1. This cycle repeats continuously.

[0079] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat pump system, comprising an economizer and an evaporator, characterized in that, Also includes: A diversion device is connected to the main circuit of the economizer, the auxiliary circuit of the economizer, and the evaporator, respectively, so as to divert the refrigerant flowing out of the evaporator to the main circuit and the auxiliary circuit of the economizer during cooling, and / or, during heating, to divert the refrigerant flowing out of the economizer to the auxiliary circuit and the evaporator.

2. The heat pump system according to claim 1, characterized in that, The diversion device includes a diversion housing, which contains a diversion cavity, a main port for connecting the main circuit of the economizer, an auxiliary port for connecting the auxiliary circuit of the economizer, and a connecting port for connecting the evaporator. The main port, the auxiliary port, and the connecting port are respectively connected to the diversion cavity.

3. The heat pump system according to claim 2, characterized in that, The main port is located above the auxiliary port.

4. The heat pump system according to claim 3, characterized in that, The auxiliary port is located at the bottom of the diversion housing, and the main port is located on the side wall of the diversion housing.

5. The heat pump system according to claim 2, characterized in that, The connecting port is located above the main port and the auxiliary port.

6. The heat pump system according to claim 2, characterized in that, The main port is provided with a main pipe for connecting to the main circuit of the economizer on the outside, the auxiliary port is provided with an auxiliary pipe for connecting to the auxiliary circuit of the economizer on the outside, and the connecting port is provided with a connecting pipe for connecting to the evaporator on the outside. The auxiliary pipe is arranged perpendicular to the main pipe, and the connecting pipe is arranged perpendicular to the main pipe.

7. The heat pump system according to claim 2, characterized in that, The structure of the diversion shell can be any one of the following: cylindrical, cubic, spiral, or funnel-shaped.

8. The heat pump system according to claim 2, characterized in that, The main port is located at or above the height center of the diversion housing.

9. The heat pump system according to claim 6, characterized in that, The main pipe is arranged in a direction parallel to the cross-section of the diversion device, and the inner wall of the diversion housing is provided with a guide groove, which is arranged in a direction parallel to the extension of the main pipe.

10. The heat pump system according to claim 1, characterized in that, It also includes a compressor and a four-way valve, wherein the compressor, the four-way valve, the evaporator, the flow divider and the economizer are connected in sequence; the economizer and the compressor are connected. It also includes: a condenser, one end of which is connected to the four-way valve and the other end of which is connected to the economizer.

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