CN111435028A - Air conditioning system - Google Patents

Abstract

The present invention provides an air conditioning system. It includes a compressor, a first throttling device, a second throttling device and a radiation convection heat exchanger; and the radiation convection heat exchanger includes: a radiation heat exchange part, and the radiation heat exchange part is in the shape of a cylinder with open ends, and the Its inner wall absorbs heat or cold, and radiates heat or cold from its outer wall; the first convection heat exchange part is arranged on the inner side of the radiation heat exchange air inside the hot part, and an inner wall surface that transfers heat or cold to the radiation heat exchange part; and a second convection heat exchange part configured to perform heat exchange with the air flowing therethrough; and the first convection heat exchange part has The first refrigerant inlet and the first refrigerant outlet, the first refrigerant inlet is connected to the first throttling device, and the first refrigerant outlet is connected to the compressor; the second convective heat exchange part has a second refrigerant inlet and a second refrigerant outlet, and the second refrigerant inlet The second throttling device is communicated, and the second refrigerant outlet is communicated with the compressor.

Description

Air Conditioning System

technical field

The invention relates to the field of refrigeration and heating, in particular to an air conditioning system.

Background technique

The existing air conditioner heat exchanger mainly heats or cools the air in the form of forced convection heat exchange, and then transfers the heat or cold energy to the room or the human body. However, the heat transfer in the form of convection heat exchange will reduce the thermal comfort of the human body. Especially when higher heating or cooling capacity is required, the high wind blown out from the heat exchanger of the air conditioner can easily cause thermal discomfort to the human body.

SUMMARY OF THE INVENTION

The present invention aims to overcome at least one defect of the existing heat exchanger, and provides an air-conditioning system, which can significantly reduce the thermal discomfort of the human body when exchanging heat with the human body or the room.

To this end, the present invention provides an air conditioning system, comprising a compressor, a first throttle device, a second throttle device and a radiation convection heat exchanger; and the radiation convection heat exchanger includes:

Radiation heat exchange part, the radiation heat exchange part is in the shape of a cylinder with two ends open, and is configured to absorb heat or cold from its inner wall, and radiate heat or cold from its outer wall to the outside;

a first convective heat exchange part, disposed inside the radiation heat exchange part, configured to transfer heat or cold energy to the air flowing through the inner side of the radiation heat exchange part, and to transfer heat or cold energy to the radiation heat exchange part the inner wall surface of the heat exchange section; and

a second convective heat exchange portion configured to exchange heat with air flowing therethrough; and

The first convective heat exchange part has a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet communicates with the first throttling device, and the first refrigerant outlet communicates with the compressor;

The second convective heat exchange part has a second refrigerant inlet and a second refrigerant outlet, the second refrigerant inlet communicates with the second throttling device, and the second refrigerant outlet communicates with the compressor.

Optionally, the radiation heat exchange part is disposed on the upper side or the lower side of the second convection heat exchange part.

Optionally, the air conditioning system further includes a condenser, the inlet of the condenser is connected to the outlet of the compressor, and the outlet of the condenser is connected to the inlet of the first throttling device and the second throttling device Import of the device.

Optionally, the radiation convection heat exchanger further includes a first fan and a second fan;

The first fan is arranged outside one end of the radiation heat exchange part, so that air enters the radiation heat exchange part from the one end of the radiation heat exchange part, and exchanges heat with the first convection heat exchange part and then flow out from the other end of the radiation heat exchange part;

The second fan is arranged on one side of the second convection heat exchange part.

Optionally, the radiant convection heat exchanger further includes a third fan, the third fan is arranged outside one end of the radiant heat exchange part, and is configured to promote part of the air from the radiant heat exchange part. One end enters the radiation heat exchange part, and flows out from the other end of the radiation heat exchange part after exchanging heat with the first convection heat exchange part; and promotes part of the air to flow through the second convection heat exchange part.

Optionally, the total volume of the refrigerant flowing space in the first convective heat exchange part is greater than the total volume of the refrigerant flowing through the space in the second convective heat exchange part, so that the refrigerant in the first convective heat exchange part The flow rate is greater than the flow rate of refrigerant in the second convective heat exchange part.

Optionally, both the first convective heat exchange part and the second convective heat exchange part adopt a finned tube structure.

Optionally, the first convective heat exchange portion includes a plurality of heat exchange plates having first refrigerant passages, each of the heat exchange plates having a first edge extending along the axial direction of the radiation heat exchange portion and a second edge; the first edge is disposed in the middle of the inner space of the radiation heat exchange portion, and the second edge is connected to the inner wall surface of the radiation heat exchange portion;

A plurality of heat dissipation fins arranged in sequence along the radial direction of the radiation heat exchange portion is disposed between every two adjacent heat exchange plates.

Optionally, the first convective heat exchange part includes a plurality of coaxially arranged heat exchange cylinders, and each of the heat exchange cylinders is coaxially arranged with the radiation heat exchange part;

A plurality of second refrigerant passages are arranged on the wall of each of the heat exchange cylinders; the outer wall surface of each of the heat exchange cylinders is arranged on a plurality of the heat dissipation fins, and is radially connected to the heat exchange cylinder The inner wall surface of the corresponding outer side of the heat dissipation cylinder or the inner wall surface of the radiation heat exchange part is thermally connected.

Optionally, the outer contour of the cross section of the radiation heat exchange portion is a circle, a semicircle, a square or a fan shape.

In the air conditioning system of the present invention, because of the radiative heat exchange part and the first convection heat exchange part, the cylindrical radiant plate bears a part of the heating or cooling load, which can reduce the blowing feeling of the human body on the premise of ensuring the heating or cooling capacity , increase the thermal comfort of the human body; especially when heating in winter, the radiant heat transfer can significantly increase the thermal comfort of the human body. Further, the addition of cylindrical radiant panels can reduce the number of refrigerant pipes (such as finned tubes).

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a radiation convection heat exchanger in the air conditioning system shown in FIG. 1;

3 is a schematic cross-sectional view of a radiation heat exchange portion and a first convection heat exchange portion in the radiation convection heat exchanger shown in FIG. 2;

4 is a schematic cross-sectional view of a radiation heat exchange portion and a first convection heat exchange portion in the radiation convection heat exchanger shown in FIG. 2;

Fig. 5 is a schematic cross-sectional view of the partial structure of the radiation convection heat exchanger shown in Fig. 2;

6 is a schematic cross-sectional view of the partial structure of the radiation convection heat exchanger shown in FIG. 2;

7 is a schematic cross-sectional view of a radiation heat exchange portion and a first convection heat exchange portion in the radiation convection heat exchanger shown in FIG. 2;

FIG. 8 is a schematic cross-sectional view of a radiation heat exchange part and a first convection heat exchange part in the radiation convection heat exchanger shown in FIG. 2;

FIG. 9 is a schematic cross-sectional view of a radiation heat exchange part and a first convection heat exchange part in the radiation convection heat exchanger shown in FIG. 2 .

Detailed ways

FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment of the present invention. As shown in FIG. 1 and with reference to FIGS. 2 to 9 , an embodiment of the present invention provides an air conditioning system. The air conditioning system may include a compressor 60, a first throttle device 81, a second throttle device 82, and a radiant convection heat exchanger. The radiation convection heat exchanger may include a radiation heat exchange part 20 , a first convection heat exchange part 30 and a second convection heat exchange part 40 . The radiation heat exchange part 20 and the first convection heat exchange part 30 may constitute a radiation convection heat exchange part.

As shown in FIG. 2 , the radiation heat exchange portion 20 has a cylindrical shape with both ends open, and is configured to absorb heat or cold from its inner wall and radiate heat or cold to the outside from its outer wall. For example, the outer contour of the cross section of the radiation heat exchange part 20 is a circle, a semicircle, a square or a fan shape. The first convection heat exchange part 30 is disposed inside the radiation heat exchange part 20, and is configured to generate heat or cold energy, transfer the heat or cold energy to the air flowing through the inner side of the radiation heat exchange part 20, and transfer the heat or cold energy It is transmitted to the inner wall surface of the radiation heat exchange part 20 . The radiation heat exchange part 20 is located on the outer shell surface of the radiation convection heat exchange part, and can be directly used as the outer shell of the radiation convection heat exchange part. The second convective heat exchange portion 40 is configured to generate heat or cold, and to exchange heat with air flowing therethrough. The radiation heat exchange part is provided on the upper side or the lower side of the second convection heat exchange part 40 . Preferably, the radiation heat exchange part 20 is arranged on the upper side of the second convection heat exchange part 40 .

The first convective heat exchange part 30 has a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet communicates with the first throttling device 81 , and the first refrigerant outlet communicates with the compressor 60 . The second convective heat exchange part 40 may have a second refrigerant inlet and a second refrigerant outlet, the second refrigerant inlet communicates with the second throttling device 82 , and the second refrigerant outlet communicates with the compressor 60 .

Further, the air conditioning system further includes a condenser 70 , the inlet of the condenser 70 is connected to the outlet of the compressor 60 , and the outlet of the condenser 70 is connected to the inlet of the first throttling device 81 and the inlet of the second throttling device 82 .

When the air conditioning system in the embodiment of the present invention is in operation, the first convective heat exchange part 30 generates heat or cold energy, exchanges heat with the air inside the radiation heat exchange part 20 , and exchanges heat with the inner wall surface of the radiation heat exchange part 20 . The air after heat exchange can flow out of the radiant heat exchange part 20 to keep warm or cool indoors or the human body. The cylindrical radiant panel bears a part of the heating or cooling load, which can reduce the blowing sensation of the human body and increase the thermal comfort of the human body on the premise of ensuring the heating or cooling capacity; especially in winter heating, the radiation heat transfer can significantly increase the human body. Thermal comfort. And the radiation heat exchange part 20 and the first convective heat exchange part 30 mainly bear the sensible heat recombination; the second convective heat exchange part 40 mainly bear the latent heat load.

In some embodiments of the present invention, the first convective heat exchange part 30 includes a refrigerant pipeline and heat dissipation fins 33 disposed on the refrigerant pipeline. For example, the refrigerant pipeline includes a plurality of circular straight pipe sections and a plurality of connecting pipe sections respectively connecting the two circular straight pipe sections; there are a plurality of radiating fins 33 installed on the plurality of straight pipe sections. That is, the first convective heat exchange part 30 can be a conventional fin-and-tube heat exchanger. The second convective heat exchange part 40 may be a conventional fin-and-tube heat exchanger.

In some preferred embodiments of the present invention, as shown in FIGS. 3 and 4 , the refrigerant pipeline includes a plurality of heat exchange plates 31 , and each heat exchange plate 31 is provided with a plurality of heat exchange plates 31 along the length of the heat exchange plate 31 . Or the first refrigerant channel 32 extending in the width direction. The plurality of heat dissipation fins 33 are attached to the plurality of heat exchange plates 31 .

Further, each heat exchange plate 31 has a first edge and a second edge extending in the axial direction of the radiation heat exchange portion 20 . The first edge is disposed in the middle of the inner space of the radiation heat exchange portion 20 , and the second edge is connected to the inner wall surface of the radiation heat exchange portion 20 . The plurality of heat exchange plates 31 are uniformly distributed along the circumferential direction of the radiation heat exchange portion 20 . For example, in some embodiments, each heat exchange plate 31 extends in the axial direction of the radiation heat exchange portion 20 and extends in the radial direction of the radiation heat exchange portion 20 , as shown in FIG. 3 . In other embodiments, each heat exchange plate 31 is disposed intersecting with the radial direction of the radiation heat exchange portion 20 toward the second edge of the heat exchange plate 31 , as shown in FIG. 4 .

In some embodiments of the present invention, a plurality of heat dissipation fins 33 arranged in sequence along the radial direction of the radiation heat exchange portion 20 are disposed between every two adjacent heat exchange plates 31 . One or more heat dissipation holes are provided to form a hollow structure. Each of the first refrigerant passages 32 extends in the axial direction of the radiation heat exchange portion 20 . The plurality of first refrigerant passages 32 in each heat exchange plate 31 are sequentially arranged in the direction from the first edge to the second edge.

Along the radial direction of the radiation heat exchange portion 20, the interval between the two adjacent heat dissipation fins 33 among the plurality of heat dissipation fins 33 between each two adjacent heat exchange plates 31 has a plurality of distance values, In order to make the arrangement density of the plurality of heat dissipation fins 33 different. For example, along the radial direction of the radiation heat exchange portion 20 , the distance values become smaller in sequence, that is, the arrangement of the heat dissipation fins 33 is first sparse and then dense.

Specifically, the plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged into multiple groups, each group of heat dissipation fins 33 has at least two heat dissipation fins 33 , and each group of heat dissipation fins 33 has at least two heat dissipation fins 33 . The distance between every two adjacent heat-dissipating fins 33 is equal to one of the above-mentioned distance values, so that the interval between the heat-dissipating fins 33 between every two adjacent heat-exchange plates 31 has multiple distance values. Groups can share one heat dissipation fin 33 , that is, use one common heat dissipation fin 33 for grouping.

In each heat exchange plate 31, in the direction from the first edge to the second edge, a plurality of first refrigerant passages 32 are arranged in sequence, and the interval between two adjacent first refrigerant passages 32 has one or more spacing values . Multiple spacing values decrease in turn. The plurality of first refrigerant passages 32 on each heat exchange plate 31 are arranged in multiple groups, each group of first refrigerant passages 32 has at least two first refrigerant passages 32 , and every two phases in each group of first refrigerant passages 32 The distance between the adjacent first refrigerant passages 32 is equal to the above-mentioned spacing value, so that the interval between the first refrigerant passages 32 on each heat exchange plate 31 has multiple spacing values, and the adjacent two groups can share one first refrigerant. The channels 32 are grouped by using a common first refrigerant channel 32 .

In the direction from the first edge to the second edge, the ratio between the number of the first refrigerant channels 32 and the number of the heat dissipation fins 33 is 4/5 to 10/1, preferably 1/1 to 10/1. Each of the radiating fins 33 has an arc shape that is arched toward the outside of the radiation heat exchange portion 20 . The cross-sectional profile of each first refrigerant passage 32 is rectangular or circular or other regular or irregular shapes. The hydraulic radius of each first refrigerant passage 32 is 0.1-10 mm; the number of the first refrigerant passages 32 on each heat exchange plate 31 is 10-50. The number of heat exchange plates 31 is 4 to 50. In some embodiments of the present invention, in the direction from the first edge to the second edge, the distance between two adjacent first refrigerant passages 32 is one, that is, the plurality of first refrigerant passages 32 are arranged at equal intervals. The distance between two adjacent heat dissipation fins 33 among the plurality of heat dissipation fins 33 between every two adjacent heat exchange plates 31 is one, that is, the distance between every two adjacent heat exchange plates 31 is one. The heat dissipation fins 33 are arranged at equal intervals.

In some optional embodiments of the present invention, as shown in FIG. 5 , each heat dissipation fin 33 may be a flat-plate heat dissipation fin 34 . Both sides of each heat exchange plate 31 are provided with the above-mentioned flat-plate heat dissipation fins 34 arranged in sequence from the corresponding first edge to the direction of the second edge. Each heat dissipation fin 33 is perpendicular to the corresponding heat exchange plate 31 . In other optional embodiments of the present invention, as shown in FIG. 6 , each heat dissipation fin 33 may be a pin-shaped heat dissipation fin 35, and two sides of each heat exchange plate 31 are provided with a plurality of The needle-shaped heat dissipation fins 35 of the heat exchange plate 31 are provided. In some optional embodiments of the present invention, other types of heat dissipation fins may also be provided on both sides of each heat exchange plate 31, such as tree-shaped heat dissipation fins, irregular heat dissipation fins, etc., as shown in FIG. 7 . shown. Further, the heat exchange plate 31 is preferably integrally formed with the heat dissipation fins 33 .

In other preferred embodiments of the present invention, as shown in FIG. 8 and FIG. 9 , the refrigerant pipeline includes a plurality of heat exchange cylinders 36 arranged coaxially, and each heat exchange cylinder 36 is the same as the radiation heat exchange part 20 . axis settings. A plurality of second refrigerant passages 37 are provided in the cylinder wall of each heat exchange cylinder 36 . The number of heat dissipation fins 33 is plural. The innermost heat exchange cylinder 36 has a plurality of heat dissipation fins 33 on at least the outer side thereof. For example, the innermost heat exchange cylinder 36 has a plurality of heat dissipation fins 33 on the outside and inside. The inner side of the outermost heat exchange cylinder 36 has a plurality of heat dissipation fins 33; and the outer side of the outermost heat exchange cylinder 36 is thermally connected to the inner wall surface of the radiation heat exchange part 20 through the plurality of heat dissipation fins 33, or, the outermost heat exchange The outer wall surface of the cylinder 36 and the inner wall surface of the radiation heat exchange part 20 are integrally formed or are in contact with each other.

Further, the inner and outer sides of each heat exchange cylinder 36 in the middle are provided with a plurality of heat dissipation fins 33 . If there is no other structure between two adjacent heat exchange cylinders 36, the heat dissipation fins on the outer side of the inner heat exchange cylinder 36 and the heat dissipation fins on the inner side of the outer heat exchange cylinder 36 are the same heat exchange fins, which can be a fin layer . If there are other structures between two adjacent heat exchange cylinders 36, such as a support cylinder arranged coaxially with the heat exchange cylinder 36, the heat dissipation fins on the outer side of the inner heat exchange cylinder 36 and the heat dissipation fins on the inner side of the outer heat exchange cylinder 36 can be Two fin layers are formed, which are located on both sides of the support cylinder.

Each of the second refrigerant passages 37 extends in the axial direction of the radiation heat exchange portion 20 . The plurality of second refrigerant passages 37 in the cylindrical wall of each heat exchange cylinder 36 are sequentially arranged along the circumferential direction of the heat exchange cylinder 36 . The cross-sections of the plurality of second refrigerant passages 37 in the cylinder wall of each heat exchange cylinder 36 may include circles and polygons, and the polygons may be approximately rectangular structures. The circumferential directions of the heat cylinders 36 are alternately arranged in sequence. Each of the heat dissipation fins 33 extends in the axial direction of the radiation heat exchange portion 20 to form an airflow channel extending in the axial direction of the radiation heat exchange portion 20 . Each heat dissipation fin 33 is provided with one or more heat dissipation holes.

In some embodiments of the present invention, the first convective heat exchange portion 30 further includes at least one of the above-mentioned support cylinders, and each support cylinder is disposed between two adjacent heat exchange cylinders 36 or disposed at the innermost heat exchange cylinder On the inner side of 36, there are cooling fins 33 between each support cylinder and the heat exchange cylinder 36 on the inner side or the outer side. Further, the heat dissipation fins 33 can be integrally formed with the corresponding heat exchange cylinders or support cylinders on the inner side thereof, and the outer sides can be in contact with and abut against the corresponding heat exchange cylinders or support cylinders on the outer side thereof.

In some embodiments of the present invention, in every two adjacent heat exchange drums 36 , the cross-sectional area of each second refrigerant passage 37 on the outer heat exchange drum 36 is larger than that on the inner heat exchange drum 36 . The area of the cross section of each of the second refrigerant passages 37 . The heat dissipation fins 33 on each side of each heat exchange cylinder 36 may constitute a fin layer. In every two adjacent fin layers, the length of the outer heat dissipation fins 33 extending in the radial direction of the radiation heat exchange portion 20 is greater than the length of the inner heat dissipation fins 33 extending in the radial direction of the radiation heat exchange portion 20 . The wall thickness of each radiating fin 33 is 0.2-1 mm, and the distance between every two adjacent radiating fins 33 in each fin layer is 0.5-10 mm. The hydraulic radius of each second refrigerant passage 37 is 0.6-10 mm.

In some embodiments of the present invention, the first convective heat exchange portion 30 defines a central channel 38 extending in the axial direction of the radiation heat exchange portion 20 and is located in the center of the space inside the radiation heat exchange portion 20 . The central channel 38 may be configured to circulate air or refrigerant. In other embodiments, both ends of the central channel 38 are provided with closed structures, and the central channel 38 can also be configured to be provided with fittings such as a shunt pipe. Each of the first refrigerant channel 32/second refrigerant channel 37 is preferably a microchannel tube. The heat exchange plate 31 , the heat exchange cylinder 36 and the radiation heat exchange portion 20 can all be made of copper or aluminum.

In some embodiments of the present invention, in order to facilitate processing and manufacturing, the first convective heat exchange part 30 is formed by an extrusion process. Or, the whole formed by the first convective heat exchange part 30 and the radiation heat exchange part 20 is formed by extrusion process. As shown in Figure 3 to Figure 9.

In some embodiments of the present invention, the refrigerant pipeline also has a main inlet pipe and a main outlet pipe; one end of each first refrigerant passage 32/second refrigerant passage 37 communicates with the main inlet pipe, and the other end communicates with the main outlet pipe , so that a plurality of first refrigerant passages 32 / second refrigerant passages 37 are connected in parallel.

In other embodiments of the present invention, the radiation convection heat exchange part may have at least one parallel unit, and each parallel unit has a plurality of channel groups. Each channel group has at least one first refrigerant channel 32/second refrigerant channel 37; the plurality of channel groups in each parallel unit are arranged in series in sequence. When there are multiple parallel units, the multiple parallel units are connected in parallel. Each channel group may have one heat exchange plate 31 as described above. For example, the number of heat exchange plates 31 is 16, wherein every 4 heat exchange plates 31 constitute 4 channel groups, which are arranged in series in sequence, that is, every 4 heat exchange plates 31 constitute a parallel unit, that is, a total of 4 parallel units , the four parallel units are connected in parallel with each other. Further, both ends of each heat exchange plate 31 are also provided with a collector inlet pipe and a collector outlet pipe, so as to facilitate the rational arrangement of pipelines. The inlet of at least one parallel unit is connected to the main inlet pipe, and the outlet can be connected to the main outlet pipe.

In some embodiments of the present invention, the radiant convection heat exchanger further includes a first fan and a second fan; the first fan is arranged outside one end of the radiant heat exchange part, so that air enters the radiant heat exchange part from one end of the radiant heat exchange part In the heat exchange part, after exchanging heat with the first convection heat exchange part, it flows out from the other end of the radiation heat exchange part; the second fan is arranged on one side of the second convection heat exchange part 40 . The first fan and the second fan are individually controllable.

In some preferred embodiments of the present invention, as shown in FIG. 2 , the radiant convection heat exchanger further includes a third fan 50 . The third fan 50 is disposed outside one end of the radiant heat exchange part and is configured to promote part of the air from One end of the radiation heat exchange part enters the radiation heat exchange part, and flows out from the other end of the radiation heat exchange part after exchanging heat with the first convection heat exchange part;

Further, the total volume of the refrigerant flowing space in the first convective heat exchange part is greater than the total volume of the refrigerant flowing space in the second convective heat exchange part 40, so that the refrigerant circulation volume in the first convective heat exchange part is larger than that in the second convective heat exchange part 40. The flow rate of the refrigerant in the convection heat exchange unit 40 .

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. An air conditioning system, characterized in that it comprises a compressor, a first throttle device, a second throttle device and a radiation convection heat exchanger; and the radiation convection heat exchanger comprises: Radiation heat exchange part, the radiation heat exchange part is in the shape of a cylinder with two ends open, and is configured to absorb heat or cold from its inner wall, and radiate heat or cold from its outer wall to the outside; a first convective heat exchange part, disposed inside the radiation heat exchange part, configured to transfer heat or cold energy to the air flowing through the inner side of the radiation heat exchange part, and to transfer heat or cold energy to the radiation heat exchange part the inner wall surface of the heat exchange section; and a second convective heat exchange portion configured to exchange heat with air flowing therethrough; and The first convective heat exchange part has a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet communicates with the first throttling device, and the first refrigerant outlet communicates with the compressor; The second convective heat exchange part has a second refrigerant inlet and a second refrigerant outlet, the second refrigerant inlet communicates with the second throttling device, and the second refrigerant outlet communicates with the compressor. 2. The air conditioning system according to claim 1, characterized in that, The radiation heat exchange part is arranged on the upper side or the lower side of the second convection heat exchange part. 3. The air-conditioning system according to claim 1 or 2, characterized in that, further comprising: a condenser, the inlet of the condenser communicates with the outlet of the compressor, and the outlet of the condenser communicates with the inlet of the first throttling device and the inlet of the second throttling device. 4. The air-conditioning system according to claim 1 or 2, characterized in that, The radiation convection heat exchanger further includes a first fan and a second fan; The first fan is arranged outside one end of the radiation heat exchange part, so that air enters the radiation heat exchange part from the one end of the radiation heat exchange part, and exchanges heat with the first convection heat exchange part and then flows out from the other end of the radiation heat exchange part; The second fan is arranged on one side of the second convection heat exchange part. 5. The air conditioning system according to claim 2, wherein, The radiant convection heat exchanger further includes a third fan, the third fan is disposed outside one end of the radiant heat exchange part, and is configured to promote part of the air from the one end of the radiant heat exchange part to enter the In the radiation heat exchange part, after exchanging heat with the first convection heat exchange part, it flows out from the other end of the radiation heat exchange part; and part of the air is urged to flow through the second convection heat exchange part. 6. The air conditioning system according to claim 1, wherein, The total volume of the refrigerant flowing space in the first convective heat exchange part is greater than the total volume of the refrigerant flowing space in the second convective heat exchange part, so that the refrigerant flow in the first convective heat exchange part is greater than all The refrigerant flow in the second convective heat exchange part. 7. The air conditioning system according to claim 1, wherein, Both the first convective heat exchange part and the second convective heat exchange part adopt a finned tube structure. 8. The air conditioning system according to claim 7, wherein, The first convective heat exchange portion includes a plurality of heat exchange plates having first refrigerant passages, each of the heat exchange plates having a first edge and a second edge extending in an axial direction of the radiation heat exchange portion; the first edge is arranged in the middle of the inner space of the radiation heat exchange part, and the second edge is connected to the inner wall surface of the radiation heat exchange part; A plurality of heat dissipation fins arranged in sequence along the radial direction of the radiation heat exchange portion is disposed between every two adjacent heat exchange plates. 9. The air conditioning system according to claim 7, wherein, The first convective heat exchange part includes a plurality of coaxially arranged heat exchange cylinders, and each of the heat exchange cylinders is coaxially arranged with the radiation heat exchange part; each of the heat exchange cylinders is provided on the cylinder wall There are multiple secondary refrigerant passages. 10. The air conditioning system according to claim 7, wherein, The outer contour of the cross section of the radiation heat exchange part is a circle, a semicircle, a square or a fan shape.

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