Air conditioning unit

Abstract

The utility model discloses an air conditioning unit which is provided with a refrigeration circulation loop and a heating circulation loop, and the flowing path of refrigerant in the refrigeration circulation loop is as follows: a compressor, a reversing valve, a first control valve, a first heat exchange channel, a first throttling element, a second heat exchange channel, a second control valve and the compressor. The flowing path of a refrigerant in the heating circulation loop is as follows: the compressor, the reversing valve, the third control valve, the third heat exchange channel, the second throttling element, the fourth heat exchange channel, the fourth control valve and the compressor; two heat exchange channels are arranged in each of the first heat exchanger and the second heat exchanger, so that the air conditioning unit can start different circulation loops in different modes, the flowing direction of a refrigerant is always opposite to the flowing direction of outdoor air and the flowing direction of indoor air, the refrigerant is always in the countercurrent state, and therefore the heat transfer amount can be increased, and the heat exchange efficiency can be improved; and meanwhile, the performance of the air conditioning unit can be improved, so that the refrigerating effect and the heating effect of the air conditioning unit can reach the optimal state.

Description

[Technical field]

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning unit. [Background technology]

[0002] With the development of cities, rail transit tools such as subways and trams have gradually become the main means of transportation for citizens; due to the increasingly high requirements for energy conservation and environmental protection, how to improve the energy efficiency of air-conditioning systems with higher energy consumption in rail transit has become a problem to be solved.

[0003] In the related art, the heat exchanger in the air-conditioning system mostly adopts a countercurrent heat exchange design, that is, the flow direction of the refrigerant and the flow direction of the air are in opposite directions, so as to enhance the heat exchange effect between the refrigerant and the air, thereby improving the energy efficiency of the air-conditioning system.

[0004] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

[0005] Using the above method, when the air-conditioning system switches between cooling mode and heating mode, only one mode can satisfy that the flow direction of the refrigerant is opposite to the flow direction of the air, that is, countercurrent heat exchange, while the other mode is cocurrent heat exchange. Then, the cooling effect and heating effect of the air-conditioning system cannot reach the optimal state, thereby failing to achieve the optimal energy-saving requirements. [Contents of the utility model]

[0006] The main purpose of the utility model is to provide an air-conditioning unit that can achieve countercurrent heat exchange in both cooling and heating modes, so that the cooling effect and heating effect of the air-conditioning unit can reach the optimal state.

[0007] To achieve the above object, the utility model provides an air conditioning unit, the air conditioning unit comprising a compressor, a first heat exchanger, a second heat exchanger, a first throttle, a second throttle, a reversing valve, a first control valve, a second control valve, a third control valve and a fourth control valve, the first heat exchanger is provided with a first heat exchange channel and a fourth heat exchange channel, the second heat exchanger is provided with a second heat exchange channel and a third heat exchange channel;

[0008] The first port of the reversing valve is connected to the outlet end of the compressor, and the second port of the reversing valve is connected to the inlet end of the compressor;

[0009] The third port of the reversing valve is connected to the inlet end of the first control valve, the two ends of the first heat exchange passage are respectively connected to the outlet end of the first control valve and the inlet end of the first throttling member, the two ends of the second heat exchange passage are respectively connected to the outlet end of the first throttling member and the inlet end of the second control valve, and the outlet end of the second control valve is connected to the fourth port of the reversing valve;

[0010] The inlet end of the third control valve is connected to the fourth port of the reversing valve, the two ends of the third heat exchange channel are respectively connected to the outlet end of the third control valve and the inlet end of the second throttling device, the two ends of the fourth heat exchange channel are respectively connected to the outlet end of the second throttling device and the inlet end of the fourth control valve, and the outlet end of the fourth control valve is connected to the third port of the reversing valve.

[0011] In one embodiment of the utility model, the first heat exchanger includes a first shell and a plurality of first heat exchange tubes and a plurality of fourth heat exchange tubes arranged in the first shell, the plurality of first heat exchange tubes are respectively connected to form the first heat exchange channel; the plurality of fourth heat exchange tubes are respectively connected to form the fourth heat exchange channel;

[0012] The second heat exchanger includes a second shell and a plurality of second heat exchange tubes and a plurality of third heat exchange tubes arranged in the second shell. The plurality of second heat exchange tubes are respectively connected to form the second heat exchange channel; the plurality of third heat exchange tubes are respectively connected to form the third heat exchange channel.

[0013] In one embodiment of the present utility model, a plurality of the first heat exchange tubes are arranged along a first direction to form a plurality of rows of the first heat exchange tubes, and the plurality of rows of the first heat exchange tubes are arranged along a second direction;

[0014] The plurality of fourth heat exchange tubes are arranged along the first direction to form a plurality of rows of the fourth heat exchange tubes, and the plurality of rows of the fourth heat exchange tubes are arranged along the second direction;

[0015] A plurality of the second heat exchange tubes are arranged along the first direction to form a plurality of rows of the second heat exchange tubes, and the plurality of rows of the second heat exchange tubes are arranged along the second direction;

[0016] The plurality of third heat exchange tubes are arranged along the first direction to form a plurality of rows of the third heat exchange tubes, and the plurality of rows of the third heat exchange tubes are arranged along the second direction.

[0017] In one embodiment of the present invention, each row of the first heat exchange tubes and each row of the fourth heat exchange tubes are staggered and spaced along the second direction;

[0018] Each row of the second heat exchange tubes and each row of the third heat exchange tubes are distributed in a staggered manner along the second direction.

[0019] In an embodiment of the present utility model, the air conditioning unit further includes a reversing valve, and the reversing valve connects the compressor, the first heat exchange channel, the second heat exchange channel, the third heat exchange channel and the fourth heat exchange channel.

[0020] In one embodiment of the utility model, the air conditioning unit further comprises a first pipeline, a second pipeline and a third pipeline, the first pipeline is provided with the first control valve, the first pipeline is connected to the third port of the reversing valve and the first ends of the multiple rows of the first heat exchange tubes, the second pipeline is connected to the second ends of the multiple rows of the first heat exchange tubes and the first ends of the multiple rows of the second heat exchange tubes; the second pipeline is provided with the first throttling member;

[0021] The third pipeline connects the second ends of the multiple rows of the second heat exchange tubes and the fourth port of the reversing valve, and the third pipeline is provided with the second control valve.

[0022] In one embodiment of the utility model, the air conditioning unit further comprises a fourth pipeline, a fifth pipeline and a sixth pipeline, the fourth pipeline is provided with the third control valve, the fourth pipeline is connected to the fourth port of the reversing valve and the first ends of the multiple rows of the third heat exchange tubes, the fifth pipeline is connected to the second ends of the multiple rows of the third heat exchange tubes and the first ends of the multiple rows of the fourth heat exchange tubes; the fifth pipeline is provided with the second throttling member;

[0023] The sixth pipeline connects the second ends of the multiple rows of the fourth heat exchange tubes and the third port of the reversing valve, and the sixth pipeline is provided with the fourth control valve.

[0024] In one embodiment of the present utility model, the air conditioning unit further comprises a first main pipe and a second main pipe, the first main pipe is connected to the third port of the reversing valve, the first pipe and the sixth pipe;

[0025] The second main pipe is connected to the fourth port of the reversing valve, the third pipe and the fourth pipe.

[0026] In one embodiment of the utility model, the air conditioning unit further includes a defrost sensor and a control assembly, wherein the defrost sensor is disposed on the surface of the first heat exchanger and is electrically connected to the control assembly; the first control valve, the second control valve, the third control valve and the fourth control valve are all electrically connected to the control assembly;

[0027] The defrost sensor is used to detect the temperature of the surface of the first heat exchanger and transmit the detected data to the control component. The control component is used to receive the data and compare it with the preset value to control the opening or closing of the first control valve, the second control valve, the third control valve and the fourth control valve.

[0028] In one embodiment of the present invention, the air conditioning unit further comprises:

[0029] a first inlet pipe liquid separation structure, wherein the first inlet pipe liquid separation structure comprises a first inlet pipe liquid separation head and a plurality of first capillaries connected to each other, the second pipeline is provided with the first inlet pipe liquid separation head, and the plurality of first capillaries are respectively connected to the first ends of the plurality of second heat exchange tubes arranged along the second direction; and

[0030] The second inlet pipe liquid separation structure comprises a second inlet pipe liquid separation head and a plurality of second capillaries connected to each other. The fourth pipeline is provided with the second inlet pipe liquid separation head. The plurality of second capillaries are respectively connected to the first ends of the plurality of third heat exchange tubes arranged along the second direction.

[0031] In one embodiment of the utility model, the air conditioning unit further comprises a first fan and a second fan, the first fan being arranged corresponding to the first heat exchanger so that the air flow direction is opposite to the flow direction of the refrigerant in the first heat exchange channel and the fourth heat exchange channel;

[0032] The second fan is arranged corresponding to the second heat exchanger so that the air flow direction is opposite to the flow direction of the refrigerant in the second heat exchange channel and the third heat exchange channel.

[0033] Compared with the prior art, the air conditioning unit provided by the utility model has at least the following beneficial effects:

[0034] The utility model provides two heat exchange channels in the first heat exchanger and the second heat exchanger. By activating different circulation loops in different modes, the flow direction of the refrigerant is always opposite to the flow direction of outdoor air and indoor air, and is always in a countercurrent state, thereby increasing the heat transfer and improving the heat exchange efficiency. At the same time, it can also improve the performance of the air-conditioning unit, so that the cooling effect and heating effect of the air-conditioning unit can reach the best state.

Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A schematic diagram of the working principle of the air conditioning unit provided by the embodiment of the utility model;

[0037] Figure 2 for Figure 1 A magnified image of point A;

[0038] Figure 3 for Figure 1 A magnified view of point B;

[0039] Figure 4 A schematic diagram of the connection between the first inlet pipe liquid separation structure and the second inlet pipe liquid separation structure of the air-conditioning unit provided by an embodiment of the utility model and the second heat exchanger.

[0040] Description of Figure Numbers:

[0041]

[0042] [Specific implementation method]

[0043] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0044] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0046] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] The utility model proposes an air conditioning unit 1000, which includes a compressor 300, a first heat exchanger 10, a second heat exchanger 20, a first throttle 30, a second throttle 209, a reversing valve 400, a first control valve 41, a second control valve 61, a third control valve 206 and a fourth control valve 207. The first heat exchanger 10 is provided with a first heat exchange channel 121 and a fourth heat exchange channel 202a, and the second heat exchanger 20 is provided with a second heat exchange channel 221 and a third heat exchange channel 201a; the first port 401 of the reversing valve is connected to the outlet end 301 of the compressor, and the second port 402 of the reversing valve is connected to the inlet end 303 of the compressor; the third port 403 of the reversing valve is connected to the inlet end 411 of the first control valve, and the first heat exchanger 10 is provided with a first heat exchange channel 121 and a fourth heat exchange channel 202a; the second heat exchanger 20 is provided with a second heat exchange channel 221 and a third heat exchange channel 201a; the first port 401 of the reversing valve is connected to the outlet end 301 of the compressor, and the second port 402 of the reversing valve is connected to the inlet end 303 of the compressor; the third port 403 of the reversing valve is connected to the inlet end 411 of the first control valve; The two ends of the channel 121 are respectively connected to the outlet end 412 of the first control valve and the inlet end 31 of the first throttling member, the two ends of the second heat exchange channel 221 are respectively connected to the outlet end 32 of the first throttling member and the inlet end 611 of the second control valve, the outlet end 612 of the second control valve is connected to the fourth port 404 of the reversing valve; the inlet end 206a of the third control valve is connected to the fourth port 404 of the reversing valve, the two ends of the third heat exchange channel 201a are respectively connected to the outlet end 206b of the third control valve and the inlet end 209a of the second throttling member, the two ends of the fourth heat exchange channel 202a are respectively connected to the outlet end 209b of the second throttling member and the inlet end 207a of the fourth control valve, and the outlet end 207b of the fourth control valve is connected to the third port 403 of the reversing valve.

[0048] The compressor 300 of the air-conditioning unit 1000 can be used to compress low-temperature and low-pressure gas (gaseous refrigerant) into high-temperature and high-pressure gas. The first heat exchanger 10 is an outdoor heat exchanger, and the second heat exchanger 20 is an indoor heat exchanger. Both heat exchangers can realize heat exchange between the refrigerant and the air to achieve the effect of heat dissipation or heat absorption; the first throttle element 30 and the second throttle element 209 both convert the normal temperature and high-pressure liquid refrigerant flowing out of the corresponding heat exchanger into a low-temperature and low-pressure gas-liquid two-phase refrigerant by throttling and reducing the pressure.

[0049] The air conditioning unit 1000 of the utility model is applied to rail transportation. The air conditioning unit 1000 has a refrigeration cycle 100 and a heating cycle 200. The flow path of the refrigerant in the refrigeration cycle 100 is: compressor 300-reversing valve 400-first control valve 41-first heat exchange channel 121-first throttle 30-second heat exchange channel 221-second control valve 61-compressor 300. In the refrigeration cycle 100, the first heat exchanger 10 can be regarded as a condenser, and the second heat exchanger 20 can be regarded as an evaporator. At this time, when the high-temperature and high-pressure gas passes through the first heat exchange channel 121, the heat is dissipated to the outside, thereby being converted into a liquid refrigerant at normal temperature and high pressure, and then throttled and reduced in pressure by the first throttling member 30, and converted into a low-temperature and low-pressure gas-liquid two-phase refrigerant. The low-temperature and low-pressure gas-liquid two-phase refrigerant flows through the second heat exchange channel 221, absorbs the heat of the indoor air, and makes the indoor air cooler, thereby achieving the purpose of refrigeration; the heat absorbed from the indoor air is converted into a low-temperature and low-pressure gas, which passes through the second heat exchanger 20 and then returns to the compressor 300, thereby completing the refrigeration cycle.

[0050] The flow path of the refrigerant in the heating cycle 200 is: compressor 300-reversing valve 400-third control valve 206-third heat exchange channel 201a-second throttling device 209-fourth heat exchange channel 202a-fourth control valve 207-compressor 300. At this time, the second heat exchanger 20 can be regarded as a condenser, and the first heat exchanger 10 can be regarded as an evaporator. The high-temperature and high-pressure gas releases heat to the indoor air through the third heat exchange channel 201a, so that the indoor air is heated, thereby achieving the heating effect; the liquid refrigerant at room temperature and high pressure coming out of the third heat exchange channel 201a is throttled and reduced in pressure by the second throttling device 209, and is converted into a low-temperature and low-pressure gas-liquid two-phase refrigerant. The low-temperature and low-pressure gas-liquid mixture (i.e., the gas-liquid two-phase refrigerant) then flows through the fourth heat exchange channel 202a to absorb the heat of the outdoor air and is converted into a low-temperature and low-pressure gas, and then returns to the compressor 300, thereby completing the heating cycle.

[0051] The reversing valve 400 in this embodiment can be used to change the flow direction of the refrigerant. For example, the refrigerant flows out from the outlet port 301 of the compressor, flows into the first port 401 of the reversing valve, and then flows out through the third port 403 of the reversing valve or the fourth port 404 of the reversing valve, and flows into the first control valve 41 or the third control valve 206, thereby realizing the conversion of the two functions of the cooling mode and the heating mode; at the same time, the reversing valve 400 can also be used for defrosting operations. When frost forms on the first heat exchanger 10, the four-way reversing valve 400 can switch the flow direction of the refrigerant to increase the surface temperature of the first heat exchanger 10, thereby completing the defrosting operation in a short time.

[0052] The reversing valve 400 cooperates with the first control valve 41 to the fourth control valve 207 to form a switch between the refrigeration cycle 100 and the heating cycle 200; by opening or closing each control valve to control the flow path of the refrigerant, the control valves of the utility model can all be solenoid valves.

[0053] In the prior art, only one heat exchange channel is provided in the first heat exchanger 10 and the second heat exchanger 20, that is, the same heat exchange channel is used for heat exchange in both the cooling mode and the heating mode. Then, only one mode can satisfy that the flow direction of the refrigerant is opposite to the flow direction of the air, that is, countercurrent heat exchange, while the other mode is cocurrent heat exchange. Then, the cooling effect and heating effect of the air-conditioning unit 1000 cannot reach the optimal state, and the optimal energy-saving requirements cannot be achieved. To solve this problem, the utility model provides two heat exchange channels in the first heat exchanger 10 and the second heat exchanger 20. By activating different circulation loops in different modes, the flow direction of the refrigerant is always opposite to the flow direction of the outdoor air and the indoor air, and is always in a state of countercurrent heat exchange, thereby increasing the heat transfer and improving the heat exchange efficiency. At the same time, it can also improve the performance of the air-conditioning unit 1000, so that the cooling effect and heating effect of the air-conditioning unit 1000 can reach the optimal state, thereby achieving the optimal energy-saving requirements.

[0054] It can be known that during countercurrent heat exchange, the air and refrigerant flow in opposite directions in the heat exchanger, the temperature gradient of the fluid is larger, and the temperature difference is larger. This temperature difference can enhance the heat transfer effect and improve the heat exchange efficiency. At the same time, during countercurrent heat exchange, fluids of different temperatures are mixed with each other in the heat exchanger, the heat transfer coefficient is higher, and the heat transfer time will also be extended to increase the heat transfer amount, thereby improving the heat exchange efficiency.

[0055] The "first direction" mentioned in this article can be a direction parallel to the X direction in the figure, or a direction forming a certain angle range with the X direction, and the angle can be within ±15°; the "second direction" mentioned in this article can be a direction parallel to the Y direction in the figure, or a direction forming a certain angle range with the Y direction, and the angle can be within ±15°; for the convenience of description, when the first heat exchanger 10 and the second heat exchanger 20 are mentioned at the same time in this article, they are described as two heat exchangers, and so on.

[0056] Reference Figures 1 to 3In one embodiment of the utility model, the first heat exchanger 10 includes a first shell 11 and a plurality of first heat exchange tubes 12 and a plurality of fourth heat exchange tubes 202 arranged in the first shell 11, the plurality of first heat exchange tubes 12 are respectively connected to form a first heat exchange channel 121; the plurality of fourth heat exchange tubes 202 are respectively connected to form a fourth heat exchange channel 202a; the second heat exchanger 20 includes a second shell 21 and a plurality of second heat exchange tubes 22 and a plurality of third heat exchange tubes 201 arranged in the second shell 21, the plurality of second heat exchange tubes 22 are respectively connected to form a second heat exchange channel 221; the plurality of third heat exchange tubes 201 are respectively connected to form a third heat exchange channel 201a.

[0057] In this embodiment, the first shell 11 and the second shell 21 both serve to fix and protect the heat exchange tubes, and can also support and accommodate other components inside the heat exchanger; the first heat exchange tube 12, the second heat exchange tube 22, the third heat exchange tube 201 and the fourth heat exchange tube 202 all serve to carry the refrigerant and provide heat transfer between the refrigerant and the air.

[0058] Taking the plurality of first heat exchange tubes 12 as an example, the plurality of first heat exchange tubes 12 are connected to form a first heat exchange channel 121, so that the refrigerant passing through the first heat exchange channel 121 is fully in contact with the air, thereby improving the heat exchange efficiency; Figure 1 The refrigerant flows from left to right in the first heat exchange channel 121 in the X direction, and the outdoor air flows from right to left in the X direction, that is, the flow direction of the refrigerant in the first heat exchange channel 121 is opposite to the flow direction of the outdoor air, thereby achieving the effect of improving the heat exchange efficiency.

[0059] In order to make the air flow along a predetermined trajectory, the utility model is provided with a first fan 70 and a second fan 208, respectively. The first fan 70 is arranged on one side of the first heat exchanger 10, and the second fan 208 is arranged on one side of the second heat exchanger 20; the two fans provide power for gas circulation, so that the air exchanging heat with the first heat exchanger 10 flows from left to right (refer to Figure 1 The air exchanging heat with the second heat exchanger 20 flows from right to left (also refer to Figure 1 In the direction shown), the purpose of forced convection and countercurrent heat exchange between the two heat exchangers and the air is achieved, and the heat exchange efficiency of the air-conditioning unit 1000 is improved in different modes.

[0060] The specific structures of the multiple second heat exchange tubes 22, the multiple third heat exchange tubes 201 and the multiple fourth heat exchange tubes 202 can refer to the multiple first heat exchange tubes 12, and the beneficial effects that can be achieved can also refer to the beneficial effects that can be achieved by setting up multiple first heat exchange tubes 12, which will not be repeated here one by one; at the same time, the flow direction of the refrigerant in the above-mentioned four heat exchange channels is opposite to the flow direction of the outside air, that is, heat exchange is carried out in a countercurrent manner, so that when the refrigerant circulates in the four heat exchange channels, the heat exchange efficiency is improved, so that the cooling effect and heating effect of the air-conditioning unit 1000 in the cooling mode and the heating mode can reach the best state.

[0061] It can be known that the first heat exchanger 10 and the second heat exchanger 20 can both be shell and tube heat exchangers, and of course can also be other forms of heat exchangers, which are not limited here; the material of the two shells can be carbon steel, stainless steel or copper, and can also be a metal material with high hardness, good thermal conductivity, corrosion resistance and other characteristics, which are not limited here; the connection between the multiple heat exchange tubes and the two shells can be a fixed connection or a detachable connection such as a screw connection, preferably a detachable connection, which can facilitate the installation and maintenance of the two shells and the multiple heat exchange tubes.

[0062] Reference Figures 1 to 3 In one embodiment of the utility model, a plurality of first heat exchange tubes 12 are arranged along the first direction to form a plurality of rows of first heat exchange tubes 12, and the plurality of rows of first heat exchange tubes 12 are arranged along the second direction; a plurality of fourth heat exchange tubes 202 are arranged along the first direction to form a plurality of rows of fourth heat exchange tubes 202, and the plurality of rows of fourth heat exchange tubes 202 are arranged along the second direction; a plurality of second heat exchange tubes 22 are arranged along the first direction to form a plurality of rows of second heat exchange tubes 22, and the plurality of rows of second heat exchange tubes 22 are arranged along the second direction; a plurality of third heat exchange tubes 201 are arranged along the first direction to form a plurality of rows of third heat exchange tubes 201, and the plurality of rows of third heat exchange tubes 201 are arranged along the second direction.

[0063] In this embodiment, multiple heat exchange tubes are arranged in multiple rows to increase the heat transfer area, which is also beneficial to air flow and heat dissipation, thereby improving the heat transfer efficiency of the two heat exchangers.

[0064] Reference Figure 1 In one embodiment of the present invention, further, each row of first heat exchange tubes 12 and each row of fourth heat exchange tubes 202 are distributed at staggered intervals along the second direction; each row of second heat exchange tubes 22 and each row of third heat exchange tubes 201 are distributed at staggered intervals along the second direction.

[0065] In this embodiment, further, each row of first heat exchange tubes 12 and each row of fourth heat exchange tubes 202 are staggered and distributed, so that the spacing between each row of first heat exchange tubes 12 can be kept stable, so that the heat generated when the refrigerant flows through each row of first heat exchange tubes 12 can be dissipated in time, and each row of first heat exchange tubes 12 can also be fully in contact with the air, so as to further improve the heat exchange efficiency between the first heat exchanger 10 and the air.

[0066] The effects that can be achieved by each row of fourth heat exchange tubes 202, each row of second heat exchange tubes 22 and each row of third heat exchange tubes 201 can refer to the effects achieved by setting each row of first heat exchange tubes 12, and will not be repeated here; each row of first heat exchange tubes 12 and each row of fourth heat exchange tubes 202 are staggered and spaced, and arranged compactly to further reduce the overall volume of the first heat exchanger 10.

[0067] Of course, in other embodiments of the present invention, the first heat exchange tube 12 may be divided into two spaces, and multiple rows of first heat exchange tubes 12 and multiple rows of fourth heat exchange tubes 202 are respectively arranged in different spaces.

[0068] Reference Figures 1 to 3 In one embodiment of the utility model, the air-conditioning unit 1000 further includes a first pipe 40, a second pipe 50 and a third pipe 60, the first pipe 40 is provided with a first control valve 41, the first pipe 40 is connected to the third port 403 of the reversing valve and the first ends 122 of the multiple rows of first heat exchange tubes, the second pipe 50 is connected to the second ends 123 of the multiple rows of first heat exchange tubes and the first ends 222 of the multiple rows of second heat exchange tubes; the second pipe 50 is provided with a first throttling member 30; the third pipe 60 is connected to the second ends 223 of the multiple rows of second heat exchange tubes and the fourth port 404 of the reversing valve, and the third pipe 60 is provided with a second control valve 61.

[0069] Reference Figures 1 to 3 In one embodiment of the utility model, the air-conditioning unit further comprises a fourth pipe 203, a fifth pipe 204 and a sixth pipe 205, the fourth pipe 203 is provided with a third control valve 206, the fourth pipe 203 is connected to the fourth port 404 of the reversing valve and the first ends 201b of the plurality of rows of third heat exchange tubes, the fifth pipe 204 is connected to the second ends 201c of the plurality of rows of third heat exchange tubes and the first ends 202b of the plurality of rows of fourth heat exchange tubes; the fifth pipe 204 is provided with a second throttling member 209; the sixth pipe 205 is connected to the second ends 202c of the plurality of rows of fourth heat exchange tubes and the third port 403 of the reversing valve, and the sixth pipe 205 is provided with a fourth control valve 207.

[0070] The first pipe 40 to the sixth pipe 205 are used to connect various components of the air-conditioning unit 1000 and are also used to transport refrigerant, thereby forming a closed refrigeration cycle loop 100 and a heating cycle loop 200 .

[0071] In this embodiment, the first pipe 40 connects the third port 403 of the reversing valve and the first ends 122 of the multiple rows of first heat exchange tubes, and the first control valve 41 is arranged between the four-way reversing valve 400 and the first heat exchanger 10 and is located on the first pipe 40; the second pipe 50 connects the second ends 123 of the multiple rows of first heat exchange tubes and the first ends 222 of the multiple rows of second heat exchange tubes, and the first throttling device 30 is arranged on the second pipe 50, the third pipe 60 connects the second end 223 of the second heat exchange tube and the fourth port 404 of the reversing valve, and the second control valve 61 is arranged on the third pipe 60, thereby forming a refrigeration cycle 100.

[0072] The fourth pipe 203 connects the first end 201b of the third heat exchange tube and the fourth port 404 of the reversing valve, the third control valve 206 is arranged on the fourth pipe 203, the fifth pipe 204 connects the second end 201c of the third heat exchange tube and the first end 202b of the fourth heat exchange tube, the second throttling member 209 is arranged on the fifth pipe 204, the sixth pipe 205 connects the second end 202c of the fourth heat exchange tube and the third port 403 of the reversing valve, and the fourth control valve 207 is arranged on the sixth pipe 205, thereby forming a heating circulation loop 200.

[0073] Reference Figure 1 From the perspective of FIG. 1 , the first pipe 40 and the sixth pipe 205 can be regarded as two branches of the first main pipe 500, the third pipe 60 and the fourth pipe 203 can be regarded as two branches of the second main pipe 600, and the first main pipe 500 and the second main pipe 600 are respectively connected to the third port 403 of the reversing valve and the fourth port 404 of the reversing valve; in the cooling mode, the third control valve 206 and the fourth control valve 207 are closed, so that the refrigerant flows along a predetermined route, thereby improving the cooling efficiency of the air-conditioning unit 1000 and reducing additional energy consumption; in the heating mode, the first control valve 41 and the second control valve 61 are closed, so that the refrigerant flows along a predetermined route, thereby improving the heating efficiency of the air-conditioning unit 1000 and reducing additional energy consumption.

[0074] It can be known from the above that the working mode of the air-conditioning unit 1000 is switched by opening or closing different control valves. The overall structure of the air-conditioning unit 1000 is simple, easy to install and has low cost.

[0075] Reference Figure 1 and Figure 2In one embodiment of the utility model, the air-conditioning unit 1000 also includes a defrost sensor 900 and a control component. The defrost sensor 900 is arranged on the surface of the first heat exchanger 10 and is electrically connected to the control component; the first control valve 41, the second control valve 61, the third control valve 206 and the fourth control valve 207 are all electrically connected to the control component; the defrost sensor 900 can be used to detect the temperature of the surface of the first heat exchanger 10 and transmit the detected data to the control component. The control component can be used to receive the data and compare it with the preset value to control the opening or closing of the first control valve 41, the second control valve 61, the third control valve 206 and the fourth control valve 207 to achieve timely defrosting.

[0076] In this embodiment, the control component can receive the signal of the defrost sensor 900 to control the opening or closing of each control valve, thereby switching the working mode.

[0077] When the air-conditioning unit 1000 is in the heating mode, the defrost sensor 900 on the first heat exchanger 10 will detect the temperature and transmit it to the control component. After comparing with the preset value, the control component finds that the temperature value for defrosting has been reached. At this time, the control component adjusts the air-conditioning unit 1000 to the cooling mode, so that the surface temperature of the first heat exchanger 10 rises, and the frost on its surface gradually melts; in order to accelerate the defrosting effect of the first heat exchanger 10, the control component can also open the third control valve 206 and the fourth control valve 207. At this time, the first control valve 41 to the fourth control valve 207 are all in the open state, and there are both downstream and upstream states in the first heat exchanger 10 and the second heat exchanger 20, that is,

[0078] The first heat exchange channel 121 is a countercurrent flow, the second heat exchange channel 221 is a countercurrent flow, the third heat exchange channel 201a is a forward flow, and the fourth heat exchange channel 202a is a forward flow.

[0079] Reference Figure 1 and Figure 4 In one embodiment of the utility model, the air-conditioning unit 1000 also includes a first inlet pipe liquid separation structure 700 and a second inlet pipe liquid separation structure 800, the first inlet pipe liquid separation structure 700 includes a first inlet pipe liquid separation head 701 and a plurality of first capillaries 702 connected to each other, the second pipeline 50 is provided with a first inlet pipe liquid separation head 701, and the plurality of first capillaries 702 are respectively connected to the first ends 222 of the plurality of second heat exchange tubes arranged along the second direction; the second inlet pipe liquid separation structure 800 includes a second inlet pipe liquid separation head 801 and a plurality of second capillaries 802 connected to each other, the fourth pipeline 203 is provided with a second inlet pipe liquid separation head 801, and the plurality of second capillaries 802 are respectively connected to the first ends 201b of the plurality of third heat exchange tubes arranged along the second direction.

[0080] In this embodiment, two inlet distributors are used to evenly distribute the refrigerant into the two capillaries so that the refrigerant is evenly distributed in each heat exchange tube, thereby making the heat exchange between the second heat exchanger 20 and the air more even.

[0081] If the liquid separation structure is not set, the refrigerant will enter the second heat exchanger 20 from the upper or lower part in sequence. In the cooling mode, since the refrigerant enters the multiple rows of second heat exchange tubes 22 at different times and the heat exchange speed with the air is also different, a temperature difference will be generated inside the second heat exchanger 20, which will cause condensation water. The condensation water will be blown into the car and affect the riding comfort. In the cooling mode, the temperature difference inside the second heat exchanger 20 will cause the temperature difference in different areas of the car to be large when it is blown into the car, affecting the riding comfort of the passengers.

[0082] By providing two inlet pipe liquid separation structures, the temperature difference inside the second heat exchanger 20 can be kept stable, and condensation water is not easily generated, thereby ensuring the comfort level in the vehicle compartment.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An air conditioning unit, characterized in that: The air conditioning unit comprises a compressor, a first heat exchanger, a second heat exchanger, a first throttle, a second throttle, a reversing valve, a first control valve, a second control valve, a third control valve and a fourth control valve, the first heat exchanger is provided with a first heat exchange channel and a fourth heat exchange channel, the second heat exchanger is provided with a second heat exchange channel and a third heat exchange channel; The first port of the reversing valve is connected to the outlet end of the compressor, and the second port of the reversing valve is connected to the inlet end of the compressor; The third port of the reversing valve is connected to the inlet end of the first control valve, the two ends of the first heat exchange passage are respectively connected to the outlet end of the first control valve and the inlet end of the first throttling member, the two ends of the second heat exchange passage are respectively connected to the outlet end of the first throttling member and the inlet end of the second control valve, and the outlet end of the second control valve is connected to the fourth port of the reversing valve; The inlet end of the third control valve is connected to the fourth port of the reversing valve, the two ends of the third heat exchange channel are respectively connected to the outlet end of the third control valve and the inlet end of the second throttling device, the two ends of the fourth heat exchange channel are respectively connected to the outlet end of the second throttling device and the inlet end of the fourth control valve, and the outlet end of the fourth control valve is connected to the third port of the reversing valve.

2. The air conditioning unit according to claim 1, characterized in that: The first heat exchanger includes a first shell and a plurality of first heat exchange tubes and a plurality of fourth heat exchange tubes arranged in the first shell, the plurality of first heat exchange tubes are respectively connected to form the first heat exchange channel; the plurality of fourth heat exchange tubes are respectively connected to form the fourth heat exchange channel; The second heat exchanger includes a second shell and a plurality of second heat exchange tubes and a plurality of third heat exchange tubes arranged in the second shell. The plurality of second heat exchange tubes are respectively connected to form the second heat exchange channel; the plurality of third heat exchange tubes are respectively connected to form the third heat exchange channel.

3. The air conditioning unit according to claim 2, characterized in that: A plurality of the first heat exchange tubes are arranged along a first direction to form a plurality of rows of the first heat exchange tubes, and the plurality of rows of the first heat exchange tubes are arranged along a second direction; The plurality of fourth heat exchange tubes are arranged along the first direction to form a plurality of rows of the fourth heat exchange tubes, and the plurality of rows of the fourth heat exchange tubes are arranged along the second direction; A plurality of the second heat exchange tubes are arranged along the first direction to form a plurality of rows of the second heat exchange tubes, and the plurality of rows of the second heat exchange tubes are arranged along the second direction; The plurality of third heat exchange tubes are arranged along the first direction to form a plurality of rows of the third heat exchange tubes, and the plurality of rows of the third heat exchange tubes are arranged along the second direction.

4. The air conditioning unit according to claim 3, characterized in that: Each row of the first heat exchange tubes and each row of the fourth heat exchange tubes are distributed in a staggered manner along the second direction; Each row of the second heat exchange tubes and each row of the third heat exchange tubes are distributed in a staggered manner along the second direction.

5. The air conditioning unit according to claim 2, characterized in that: The air conditioning unit further comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is provided with the first control valve, the first pipeline is connected to the third port of the reversing valve and the first ends of the multiple rows of the first heat exchange tubes, the second pipeline is connected to the second ends of the multiple rows of the first heat exchange tubes and the first ends of the multiple rows of the second heat exchange tubes; the second pipeline is provided with the first throttling member; The third pipeline connects the second ends of the multiple rows of the second heat exchange tubes and the fourth port of the reversing valve, and the third pipeline is provided with the second control valve.

6. The air conditioning unit according to claim 5, characterized in that: The air conditioning unit further comprises a fourth pipeline, a fifth pipeline and a sixth pipeline, the fourth pipeline is provided with the third control valve, the fourth pipeline is connected to the fourth port of the reversing valve and the first ends of the multiple rows of the third heat exchange tubes, the fifth pipeline is connected to the second ends of the multiple rows of the third heat exchange tubes and the first ends of the multiple rows of the fourth heat exchange tubes; the fifth pipeline is provided with the second throttling member; The sixth pipeline connects the second ends of the multiple rows of the fourth heat exchange tubes and the third port of the reversing valve, and the sixth pipeline is provided with the fourth control valve.

7. The air conditioning unit according to claim 6, characterized in that: The air conditioning unit further comprises a first main pipe and a second main pipe, wherein the first main pipe is connected to the third port of the reversing valve, the first pipe and the sixth pipe; The second main pipe is connected to the fourth port of the reversing valve, the third pipe and the fourth pipe.

8. The air conditioning unit according to any one of claims 1 to 7, characterized in that: The air conditioning unit further includes a defrost sensor and a control component, wherein the defrost sensor is disposed on the surface of the first heat exchanger and is electrically connected to the control component; the first control valve, the second control valve, the third control valve and the fourth control valve are all electrically connected to the control component; The defrost sensor is used to detect the temperature of the surface of the first heat exchanger and transmit the detected data to the control component. The control component is used to receive the data and compare it with the preset value to control the opening or closing of the first control valve, the second control valve, the third control valve and the fourth control valve.

9. The air conditioning unit according to claim 6, characterized in that: The air conditioning unit also includes: a first inlet pipe liquid separation structure, wherein the first inlet pipe liquid separation structure comprises a first inlet pipe liquid separation head and a plurality of first capillaries connected to each other, the second pipeline is provided with the first inlet pipe liquid separation head, and the plurality of first capillaries are respectively connected to the first ends of the plurality of second heat exchange tubes arranged along the second direction; and The second inlet pipe liquid separation structure comprises a second inlet pipe liquid separation head and a plurality of second capillaries connected to each other. The fourth pipeline is provided with the second inlet pipe liquid separation head. The plurality of second capillaries are respectively connected to the first ends of the plurality of third heat exchange tubes arranged along the second direction.

10. The air conditioning unit according to any one of claims 1 to 7, characterized in that: The air conditioning unit further comprises a first fan and a second fan, wherein the first fan is arranged corresponding to the first heat exchanger so that the air flow direction is opposite to the flow direction of the refrigerant in the first heat exchange channel and the fourth heat exchange channel; The second fan is arranged corresponding to the second heat exchanger so that the air flow direction is opposite to the flow direction of the refrigerant in the second heat exchange channel and the third heat exchange channel.

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