Air source heat pump multi-split air conditioning unit

Abstract

The utility model discloses an air source heat pump multi-split air conditioning unit, and relates to the technical field of air source heat pump air conditioners, the air source heat pump multi-split air conditioning unit comprises an equipment backboard used for being installed on a wall body, and a bottom plate is fixedly arranged at the bottom; the inner shell is mounted on the equipment backboard; the fan blade roller is rotationally connected to the bottom of the inner shell; the heat dissipation frame body is mounted at the top of the space defined by the inner shell; the partition plate is fixedly arranged in the middle of the inner shell, the top of the partition plate is horizontally arranged, the middle of the partition plate is vertically arranged, and the bottom of the partition plate inclines towards one side away from the equipment backboard; the water receiving frame is installed on the upper surface of the partition plate and located below the bottom of the heat dissipation frame, two ends extend out of the side wall of the inner shell, and the part extending out of the bottom of the inner shell is communicated with a drainage pipe; and the shell is installed on the equipment backboard, an air inlet is formed in the top of the shell and right faces the heat dissipation frame, and an air outlet is formed in the bottom of the shell. The air source heat pump air conditioning unit has the effects of improving the reasonability of the space structure design of the indoor unit of the air source heat pump air conditioning unit and improving the drainage effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air source heat pump air conditioners, and in particular to an air source heat pump VRF air conditioning unit. BACKGROUND

[0002] An air source heat pump air conditioner is a device that absorbs or releases heat by changing the state of refrigerant in an evaporator and a condenser through a compressor, and transports hot or cold air in the corresponding area to the indoor, wherein the heating and cooling processes are opposite.

[0003] Compared with the traditional air conditioner, the air source heat pump air conditioning unit has more stable and efficient heating effect, and can still operate stably and efficiently in an environment of-10°C. The air source heat pump air conditioner generally has multiple units connected in parallel in the indoor operation, and can drive a larger area of indoor temperature adjustment.

[0004] The air source heat pump air conditioning unit generally includes an indoor unit and an outdoor unit part. The outdoor unit is an air source heat pump, mainly for conversion of refrigerant medium, and the indoor unit exchanges heat of the refrigerant with air to achieve the effect of heating and cooling. When the indoor unit is used, water droplets will be generated on the heat dissipation fins due to heat conduction, and then fall down. Long-term use will cause water collection in the machine body. Moreover, the indoor unit of most air source heat pump air conditioning units has a large volume and has the problem of unreasonable internal space distribution. CONTENT OF THE INVENTION

[0005] The present application provides an air source heat pump VRF air conditioning unit to improve the problem of unreasonable internal space structure design and low condensate water discharge efficiency of the existing air source heat pump air conditioning unit installed in the indoor part.

[0006] The air source heat pump VRF air conditioning unit provided by the present application adopts the following technical scheme:

[0007] An air source heat pump VRF air conditioning unit comprises

[0008] An equipment back plate is hung on a wall body through an installed hole, and a bottom plate is fixed at the bottom;

[0009] An inner shell is installed on the equipment back plate and is provided with an opening at a part away from the equipment back plate;

[0010] A fan blade roller is rotationally connected to the bottom of the space surrounded by the inner shell and is driven by a motor;

[0011] A heat dissipation frame body is rectangular, is installed at the top of the space surrounded by the inner shell, and comprises heat dissipation fins and a conduction pipe. The conduction pipe is distributed in a serpentine shape, the first end and the second end of the conduction pipe are respectively a first connecting pipe and a second connecting pipe, the heat dissipation fins are a plurality of heat dissipation fins, and the heat dissipation fins are fixed on the conduction pipe.

[0012] A partition plate is fixed in the middle of the space surrounded by the inner shell, the top part is horizontally arranged, the middle part is vertically arranged, and the bottom part is obliquely arranged away from the back plate of the device. The partition plate and the inner shell form a ventilation channel;

[0013] A water receiving frame is installed on the upper surface of the partition plate, located below the bottom of the heat dissipation frame body, and the ends extend out from the side wall of the inner shell. The part extending out from the bottom of the inner shell is connected with a drain pipe;

[0014] An outer shell is installed on the back plate of the device, which wraps the inner shell and the motors, the first connecting pipes, the second connecting pipes and the drain pipe on both sides of the inner shell. The top and bottom of the partition plate are in abutment with the outer shell. The top of the outer shell is provided with an air inlet, and the air inlet is opposite to the heat dissipation frame body. The bottom of the outer shell is provided with an air outlet;

[0015] The main pipes are the parts of the refrigerant pipes of the air source heat pump air conditioning unit outdoor unit extending out of the outdoor unit, which are two pipes connected in the outdoor unit to circulate refrigerant. The plurality of first connecting pipes are connected with one of the main pipes, and the plurality of second connecting pipes are connected with the other main pipe. The refrigerant flows in opposite directions in the two main pipes.

[0016] Optionally, an electric heating pipe is installed in the inner shell opposite to the air inlet, and a plurality of fins are distributed on the electric heating pipe.

[0017] Optionally, the heat dissipation frame body is obliquely arranged with the top end close to the back plate of the device.

[0018] Optionally, the bottom of the heat dissipation frame body is located in the water receiving frame.

[0019] Optionally, a wind deflector is installed at the bottom of the inner shell, and the bottom of the wind deflector is obliquely arranged with the inclined surface facing the blade drum. The bottom of the wind deflector abuts against the bottom plate.

[0020] Optionally, the inner diameter of the first connecting pipe is larger than the inner diameter of the second connecting pipe.

[0021] During heating, the refrigerant enters the heat dissipation frame body through the first connecting pipe and flows out of the heat dissipation frame body from the second connecting pipe. During cooling, the refrigerant flows in the opposite direction.

[0022] Optionally, the second connecting pipe is connected with a heating pipe and a cooling pipe. The second connecting pipe is cut to form a top break and a bottom break. The top ends of the heating pipe and the cooling pipe are connected with each other and connected with the top break of the second connecting pipe. The bottom ends of the heating pipe and the cooling pipe are connected with each other and connected with the bottom break of the second connecting pipe.

[0023] The inner diameters of the top ends and the bottom ends of the heating pipe and the cooling pipe are the same as the inner diameter of the second connecting pipe. An electromagnetic valve is installed on each of the heating pipe and the cooling pipe. One part of the cooling pipe is a slow flow pipe, and the inner diameter of the slow flow pipe is smaller than the inner diameter of the cooling pipe.

[0024] Optionally, the slow flow pipe is spirally arranged.

[0025] Optionally, the first connecting pipe, the part of the second connecting pipe extending out of the shell and the main pipe are all sleeved with heat preservation pipes.

[0026] Optionally, a protective shell is arranged outside the main pipe, the two main pipes are wrapped in the protective shell, and the bottom of the drain pipe is also located in the protective shell and introduced to the outdoor.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The refrigerant pipe of the outdoor unit of the air source heat pump air conditioning unit is used as the main pipe to provide refrigerant for multiple indoor units to heat or cool, effectively improving the utilization effect of the refrigerant temperature and the efficiency of indoor cooling or heating;

[0029] 2. The equipment back plate and the inner shell provide installation space for the partition plate, the fan blade roller and the heat dissipation frame, so that the internal equipment can be conveniently replaced and maintained after the shell is removed, thereby improving the efficiency of the air source heat pump air conditioner indoor unit maintenance and making the space distribution more reasonable;

[0030] 3. The partition plate can divide the fan blade roller and the heat dissipation frame into two spaces and communicate through the formed ventilation channel, so that the air entering from the air inlet can be more effectively exchanged through the heat dissipation frame and then blown out from the air outlet, and the water receiving frame is also provided with installation space, and the inclined arrangement of the heat dissipation frame effectively reduces the occupation of the ventilation channel by the water receiving frame, so that the space distribution is more reasonable;

[0031] 4. The arrangement of the electric heating pipe not only can face the air inlet directly and assist heating to improve the heating efficiency, but also can be effectively installed in the space formed by the inclination of the heat dissipation frame;

[0032] 5. The arrangement of the refrigeration pipe and the heating pipe can be controlled to open and close through the electromagnetic valve, so that only the heating pipe flows in heating and only the refrigeration pipe flows in cooling, and the slow flow design of the slow flow pipe improves the refrigeration effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0034] Figure 2 is a partial exploded view showing the inner shell;

[0035] Figure 3 is a partial sectional view showing the ventilation channel;

[0036] Figure 4 is a partial schematic view showing the first connecting pipe;

[0037] Figure 5 is a partial view showing the second connecting pipe.

[0038] In the figure, 1 is a device backboard; 11 is a bottom plate; 2 is an inner shell; 21 is a fan roller; 22 is a partition plate; 221 is a ventilation passage; 23 is a heat dissipation frame; 231 is a heat dissipation fin; 232 is a conduction pipe; 24 is a guide vane; 3 is a water collecting frame; 31 is a drain pipe; 4 is an outer shell; 41 is an air inlet; 42 is an air outlet; 5 is a main pipe; 51 is a heat preservation pipe; 6 is a first connecting pipe; 7 is a second connecting pipe; 71 is a heating pipe; 711 is a solenoid valve; 72 is a refrigeration pipe; 721 is a slow flow pipe; 8 is a protective shell; 9 is an electric heating pipe. DETAILED DESCRIPTION

[0039] The following description will be made in conjunction with the accompanying drawings. Figure 1-5 The application is described in further detail.

[0040] The application discloses an air source heat pump VRF air conditioning unit.

[0041] Reference Figure 1 and Figure 2 The air source heat pump VRF air conditioning unit comprises a device backboard 1, a bottom plate 11, an inner shell 2, an outer shell 4, a partition plate 22, a heat dissipation frame 23, a fan roller 21 and a main pipe 5. The device backboard 1 is hung on a wall through a mounting hole, the bottom plate 11 is fixedly arranged at the bottom of the device backboard 1 and is horizontally arranged and integrally formed with the device backboard 1. The inner shell 2 is fixedly arranged on the device backboard 1, the part of the inner shell 2 away from the device backboard 1 and the bottom are open, and the bottom of the inner shell 2 is fixedly connected with the bottom plate 11. The fan roller 21 is rotationally connected at the bottom of the space surrounded by the inner shell 2 and is driven to rotate by a motor. The heat dissipation frame 23 is rectangular and is installed at the top of the space surrounded by the inner shell 2 and is used for exchanging temperature with air. The partition plate 22 is fixedly arranged at the middle of the space surrounded by the inner shell 2, separates the fan roller 21 and the heat dissipation frame 23 into two spaces after the outer shell 4 is buckled and is connected through the ventilation passage 221 formed by the partition plate 22 and the inner shell 2. The outer shell 4 is installed on the device backboard 1, wraps the inner shell 2 and wraps the motor of the fan roller 21. The top of the outer shell 4 is provided with an air inlet 41 opposite to the heat dissipation frame 23, and the bottom of the outer shell 4 is provided with an air outlet 42. The main pipe 5 is a part of the refrigerant pipe of the outdoor unit of the air source heat pump air conditioning unit and extends out of the outdoor unit and is two. The two main pipes 5 are connected inside the outdoor unit of the air source heat pump air conditioning unit and are used for providing refrigerant for the heat dissipation frame 23, that is, the main pipe 5 can provide refrigerant for multiple indoor units of a set of air source heat pump air conditioning units to perform refrigeration or heating, and the refrigerant in the two main pipes 5 flows in opposite directions.

[0042] One outdoor unit of an air source heat pump air conditioning unit supplies refrigerant to the heat dissipation frames 23 of multiple indoor units within the system via a main pipe 5. The fan blades 21 rotate, blowing air out of the inner casing 2, allowing outside air to enter the inner casing 2 through the air inlet and exchange heat with the heat dissipation frames 23. After passing through the ventilation channel 221, the air is discharged from the air outlet, thus providing cooling or heating to the indoor units. This multi-unit design effectively improves the refrigerant utilization efficiency within the air source heat pump air conditioning unit and enhances both heating and cooling efficiency.

[0043] refer to Figure 2 and Figure 3 The partition plate 22 is horizontally positioned at the top and can abut against the outer casing 4. The middle part of the partition plate 22 is vertically positioned, and the space between this part and the inner wall of the inner casing 2 is a ventilation channel 221. The bottom of the partition plate 22 is inclined towards the back panel 1 of the device to be tested and abuts against the outer casing 4. A water collection frame 3 is installed on the upper surface of the partition plate 22, and the water collection frame 3 has an opening. Both ends of the water collection frame 3 extend from the side wall of the inner casing 2, and the part of the water collection frame 3 extending from the bottom of the inner casing 2 is connected to a drain pipe 31. After the outer casing 4 is fastened and installed, the drain pipe 31 is partially covered, and the bottom of the drain pipe 31 extends from the bottom plate 11 and connects to the outside. The bottom of the heat dissipation frame 23 is directly opposite to the water collection frame 3 and is located in the water collection frame 3. An air guide plate 24 is installed at the bottom of the inner casing 2. The bottom of the air guide plate 24 is inclined and the inclined surface faces the fan blade roller 21. The bottom of the air guide plate 24 abuts against the bottom plate 11.

[0044] The contact arrangement between the partition plate 22 and the outer casing 4 effectively improves the stability of the partition plate 22 installation and reduces the impact of vibration after the outer casing 4 is installed. The inclined bottom of the partition plate 22 and the air guide plate 24 effectively improve the efficiency of airflow from the air outlet 42 and reduce the air resistance encountered during the process. The partition plate 22 also provides installation space for the water collection frame 3, thereby collecting water droplets generated during the heat exchange between the heat dissipation frame 23 and the air, and discharging them through the drain pipe 31. The bottom of the heat dissipation frame 23 being located inside the water collection frame 3 effectively improves the accuracy of the water collection frame 3 in collecting water droplets on the heat dissipation frame 23.

[0045] refer to Figure 4 and Figure 5The heat dissipation frame 23 comprises heat dissipation fins 231 and a conducting pipe 232, the conducting pipe 232 is in a serpentine shape, and the first connecting pipe 6 and the second connecting pipe 7 are respectively arranged at the first end and the second end of the conducting pipe 232. The heat dissipation fins 231 are arranged on the conducting pipe 232. The heat dissipation fins 231 are made of metal. The first connecting pipe 6 and the second connecting pipe 7 are buckled in the outer shell 4, and the first connecting pipe 6 and the second connecting pipe 7 are arranged on the same side of the inner shell 2 and extend out of the bottom plate 11. The heat dissipation frame 23 is arranged in an inclined manner and the top end of the heat dissipation frame 23 is close to the equipment back plate 1. The electric heating pipe 9 is arranged in the inner shell 2 and opposite to the air inlet 41, and a plurality of fins are arranged on the electric heating pipe 9.

[0046] The plurality of first connecting pipes 6 are communicated with one of the main pipes 5, and the plurality of second connecting pipes 7 are communicated with the other main pipe 5. The inner diameter of the first connecting pipe 6 is larger than the inner diameter of the second connecting pipe 7. During heating, the refrigerant enters the heat dissipation frame 23 through the first connecting pipe 6 and flows out of the heat dissipation frame 23 through the second connecting pipe 7. During cooling, the flow direction of the refrigerant is opposite. The second connecting pipe 7 is communicated with the heating pipe 71 and the cooling pipe 72. The second connecting pipe 7 is cut to form a top cut and a bottom cut. The top ends of the heating pipe 71 and the cooling pipe 72 are communicated with each other and connected to the top cut of the second connecting pipe 7. The bottom ends of the heating pipe 71 and the cooling pipe 72 are communicated with each other and connected to the bottom cut of the second connecting pipe 7. The inner diameters of the top ends and the bottom ends of the heating pipe 71 and the cooling pipe 72 are the same as the inner diameter of the second connecting pipe 7. The electromagnetic valves 711 are arranged on the heating pipe 71 and the cooling pipe 72. In this embodiment, the electromagnetic valves 711 can also be replaced by electromagnetic expansion valves. One part of the cooling pipe 72 is a slow flow pipe 721, and the inner diameter of the slow flow pipe 721 is smaller than the inner diameter of the cooling pipe 72 and is arranged in a spiral shape. The parts of the first connecting pipe 6, the second connecting pipe 7 and the main pipe 5 extending out of the outer shell 4 are all sleeved with the heat preservation pipes 51. The protective shell 8 is arranged outside the main pipes 5 and wraps the two main pipes 5. The bottom part of the drain pipe 31 is also arranged in the protective shell 8.

[0047] In combination with the above Figure 1 The inclined arrangement of the heat dissipation frame can increase the area of the heat dissipation fins 231 in a limited space and effectively make the air entering the inner shell 2 from the air inlet 41 contact and exchange temperature with the heat dissipation frame 23 and then be discharged through the ventilation channel 221. The inclined arrangement of the heat dissipation frame can also provide installation space for the electric heating pipe 9 and make the position of the electric heating pipe 9 opposite to the air inlet 41, thereby improving the auxiliary heating efficiency of the electric heating pipe 9. The same side arrangement of the first connecting pipe 6 and the second connecting pipe 7 can make the refrigerant pipe arrangement more reasonable. The parts of the first connecting pipe 6 and the second connecting pipe 7 wrapped by the outer shell 4 can effectively improve the protection of the first connecting pipe 6 and the second connecting pipe 7.

[0048] The inner diameter of the first connecting pipe 6 is larger than the inner diameter of the second connecting pipe 7, so that when heating is performed, the flow of the refrigerant flowing into the conducting pipe 232 is larger, and the heating effect is improved; when cooling is performed, the flow of the refrigerant flowing into the conducting pipe 232 is reduced under the limitation of the inner diameter of the second connecting pipe 7, and the refrigerant flowing into the conducting pipe 232 has sufficient pressure, and the cooling effect is improved. The heating pipe 71 and the cooling pipe 72 arranged on the second connecting pipe 7 can control the pipe through which the refrigerant flows when cooling and heating through the two electromagnetic valves 711: when cooling, the electromagnetic valve 711 of the heating pipe 71 is closed, and the electromagnetic valve 711 of the cooling pipe 72 is opened, so that the refrigerant passes through the slow-flow pipe 721 with a smaller inner diameter, and the pressure loss of the refrigerant is further reduced, and the length of the slow-flow pipe 721 is increased through the spiral arrangement of the slow-flow pipe 721, and the cooling effect is improved; when heating, the electromagnetic valve 711 of the heating pipe 71 is opened, and the electromagnetic valve 711 of the cooling pipe 72 is closed, and the refrigerant flows out through the heating pipe 71 with the same inner diameter as the second connecting pipe 7.

[0049] The arrangement of the heat preservation pipe 51 can effectively reduce the temperature loss of the refrigerant, and the arrangement of the protection shell 8 can not only centrally guide the main pipe 5 and the drain pipe 31, but also effectively protect the main pipe 5 and the drain pipe 31.

[0050] The implementation principle of the air source heat pump multi-split air conditioning unit in the embodiment of the application is that: the inclined arrangement of the heat dissipation frame body 23 not only increases the effective contact area of air and the heat dissipation fin 231 in a limited space, but also provides installation space for the electric heating pipe 9 by using the space left by the inclination, so as to perform auxiliary heating during heating and improve the heating effect. The arrangement of the partition plate 22 can effectively divide the space surrounded by the inner shell 2 into two parts, not only improves the air extraction efficiency of the heat exchange between the fan drum 21 and the heat dissipation frame body 23 through the formed ventilation channel 221, but also provides installation space for the water receiving frame 3. Through reasonable design, the position of the water receiving frame 3 is opposite to the bottom end of the heat dissipation frame body 23, which can effectively receive the water droplets at the bottom of the heat dissipation frame body 23, and also effectively utilizes the inclined arrangement of the heat dissipation frame body 23 to avoid the water receiving frame 3 and the ventilation channel 221, and ensures the air flow efficiency. Not only the internal space utilization efficiency and rationality of the indoor unit of the air source heat pump air conditioning unit are improved.

[0051] The design of the refrigeration pipe 72 and the heating pipe 71 of the second connecting pipe 7 cooperates with the electromagnetic valve 711 to switch to the corresponding pipe when refrigeration and heating are performed, so that the refrigerant flows through the slow-flow pipe 721 when refrigerating, and the refrigeration effect is improved. Under the refrigerant provided by the outdoor unit of the air source heat pump air conditioning unit, the utilization efficiency of the refrigerant can be improved by multiple indoor units for refrigeration or heating, and the efficiency of indoor refrigeration and heating is also improved. The embodiments of the specific embodiments are the preferred embodiments of the application, but do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A multi-split air conditioning unit with an air source heat pump, characterized in that: The application relates to a device backboard (1) which is hung on a wall through an installed hole, and a bottom plate (11) is fixedly arranged at the bottom of the device backboard (1). An inner shell (2) is arranged on the device backboard (1), and an opening is arranged on a portion, away from the device backboard (1). A fan blade roller (21) is rotationally connected at the bottom of a space surrounded by the inner shell (2) and is driven by a motor. A heat dissipation frame (23) is rectangularly arranged at the top of the space surrounded by the inner shell (2) and comprises heat dissipation fins (231) and a conduction pipe (232). The conduction pipe (232) is arranged in a serpentine shape, and the first connecting pipe (6) and the second connecting pipe (7) are arranged at the two ends of the conduction pipe (232) respectively. The heat dissipation fins (231) are arranged on the conduction pipe (232). A partition plate (22) is fixedly arranged in the middle of the space surrounded by the inner shell (2). The top of the partition plate (22) is horizontally arranged, the middle of the partition plate (22) is vertically arranged, and the bottom of the partition plate (22) is obliquely arranged away from the device backboard (1). The partition plate (22) and the inner shell (2) form a ventilation channel (221). A water collecting frame (3) is arranged on the upper surface of the partition plate (22) and is located below the bottom of the heat dissipation frame (23). The two ends of the water collecting frame (3) are arranged outside the side wall of the inner shell (2), and the portion of the water collecting frame (3) arranged outside the bottom of the inner shell (2) is connected with a drain pipe (31). An outer shell (4) is arranged on the device backboard (1) and wraps the inner shell (2). The motor, the first connecting pipe (6), the second connecting pipe (7) and the drain pipe (31) arranged on the two sides of the inner shell (2) are wrapped by the outer shell (4). The top and the bottom of the partition plate (22) are abutted and attached to the outer shell (4). An air inlet (41) is arranged at the top of the outer shell (4) and is opposite to the heat dissipation frame (23). An air outlet (42) is arranged at the bottom of the outer shell (4). A main pipe (5) is arranged for the portion of the refrigerant pipe of the air source heat pump air conditioning unit outdoor unit extending outside the outdoor unit. The main pipe (5) is arranged in two and is connected with each other in the outdoor unit to circulate the refrigerant. The first connecting pipe (6) is connected with one of the main pipes (5), the second connecting pipe (7) is connected with the other main pipe (5), and the refrigerant flows in opposite directions in the two main pipes (5). An electric heating pipe (9) is arranged in the inner shell (2) and is opposite to the air inlet (41). A plurality of fins are arranged on the electric heating pipe (9).

2. The air source heat pump VRF air conditioning unit of claim 1, wherein: The heat dissipation frame (23) is obliquely arranged and the top end of the heat dissipation frame (23) is close to the device backboard (1).

3. The air source heat pump VRF air conditioning unit according to claim 1 or 2, characterized in that: The bottom of the heat dissipation frame (23) is located in the water collecting frame (3).

4. The air source heat pump VRF air conditioning unit of claim 3, wherein: An air deflector (24) is arranged at the bottom of the inner shell (2). The bottom of the air deflector (24) is obliquely arranged and the oblique surface of the air deflector (24) faces the fan blade roller (21). The bottom of the air deflector (24) is abutted to the bottom plate (11).

5. The air source heat pump VRF air conditioning unit of claim 1, wherein: The inner diameter of the first connecting pipe (6) is larger than the inner diameter of the second connecting pipe (7).

6. The air source heat pump VRF air conditioning unit of claim 1, wherein: When heating, the refrigerant enters the heat dissipation frame (23) through the first connecting pipe (6) and flows out of the heat dissipation frame (23) through the second connecting pipe (7). When cooling, the refrigerant flows in the opposite direction. The second connecting pipe (7) is connected with a heating pipe (71) and a cooling pipe (72). The second connecting pipe (7) is cut to form a top cut and a bottom cut. The top ends of the heating pipe (71) and the cooling pipe (72) are connected with each other and are connected with the top cut of the second connecting pipe (7). The bottom ends of the heating pipe (71) and the cooling pipe (72) are connected with each other and are connected with the bottom cut of the second connecting pipe (7).

7. The air source heat pump VRF air conditioning unit of claim 6, wherein: ​ The top end and bottom end inner diameters of the heating pipe (71) and the refrigeration pipe (72) are the same as the inner diameter of the second connecting pipe (7), and the heating pipe (71) and the refrigeration pipe (72) are both provided with electromagnetic valves (711), and one part of the refrigeration pipe (72) is a slow flow pipe (721), and the inner diameter of the slow flow pipe (721) is smaller than that of the refrigeration pipe (72).

8. The air source heat pump VRF air conditioning unit of claim 7, wherein: The slow flow pipe (721) is spirally arranged.

9. The air source heat pump VRF air conditioning unit of claim 1, wherein: The first connecting pipe (6), the second connecting pipe (7) and the main pipe (5) extending out of the shell (4) are all sleeved with heat preservation pipes (51).

10. The air source heat pump VRF air conditioning unit of claim 9, wherein: The main pipe (5) is externally provided with a protective shell (8), the two main pipes (5) are wrapped in the protective shell (8), and the drain pipe (31) is also located in the protective shell (8) and introduced to the outdoor.

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