CN218096691U - Heat exchange device, refrigeration circuit and air conditioning device - Google Patents

Abstract

The present disclosure provides a heat exchange apparatus, a refrigeration circuit, and an air conditioning apparatus. The heat exchange device includes: the pot-type falling film heat exchanger comprises a shell, an inner cylinder and a heat exchange coil, wherein a liquid inlet and a gas inlet and outlet port are formed in the first axial end of the shell, and the heat exchange coil comprises a falling film area heat exchange section and a full liquid area heat exchange section; and the oil return device comprises an air duct, an oil return part and a filling part, wherein the air duct is communicated with the gas inlet and outlet port of the shell and comprises a first air duct inlet and outlet which is positioned in a gas phase area of the inner barrel, the oil return part comprises one or more oil return ports, the oil return port is communicated with a hollow part of the air duct which is positioned between the first air duct inlet and outlet port and the gas inlet and outlet port, the filling part is arranged in a space of the axial second end of the shell, and the oil return port and the filling part are positioned between one end of the heat exchange section of the liquid full area close to the heat exchange section of the falling film area and the inner wall surface of the second end of the shell along the axial direction of the shell.

Description

Heat exchange device, refrigeration circuit and air conditioning device

Technical Field

The disclosure relates to the technical field of heat exchange and air conditioning, in particular to heat exchange equipment, a refrigeration loop and air conditioning equipment.

Background

As a novel high-efficiency energy-saving device, the pot-type falling film heat exchanger is gradually replacing a flooded evaporator to be applied to air conditioning equipment. The tank-type falling film heat exchanger has the advantages of small refrigerant filling amount, small hydrostatic pressure difference, high heat exchange efficiency and convenient oil return. The tank-type falling film heat exchanger is provided with a liquid filling area, and a certain liquid level is kept in the tank-type falling film heat exchanger when the unit operates.

In the related art known to the inventor, an oil return device is installed in a pot-type falling film heat exchanger, and lubricating oil which is mutually soluble with a liquid refrigerant in a liquid-full area is sucked away by using a U-shaped pipe installed in the radial middle of a heat exchange coil of the pot-type falling film heat exchanger and an oil return hole at the bottom of the U-shaped pipe through a entrainment effect and returns to a compressor of air conditioning equipment, so that the purpose of oil return is achieved.

In carrying out the present disclosure, the inventors have discovered that the area in the center of the coil in the flooded area is not efficiently utilized because the U-tube extends into the center of the coil section in the flooded area. A large amount of liquid refrigerants are accumulated at the bottom of the air conditioner, so that the refrigerant filling amount is increased, and the cost of the air conditioner is increased. Meanwhile, because a large amount of liquid refrigerant is accumulated in a full liquid area, the content of lubricating oil mutually soluble with the liquid refrigerant is diluted. The oil return difficulty is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heat exchange equipment, refrigeration circuit and air conditioning equipment, aim at solving the problem that the heat exchange equipment refrigerant volume of filling including pot-type falling film heat exchanger and oil returning device is big.

A first aspect of the present disclosure provides a heat exchange apparatus comprising:

the tank type falling film heat exchanger comprises a shell, an inner cylinder and a heat exchange coil, wherein a liquid inlet and a gas inlet and outlet are formed in the first axial end of the shell, the heat exchange coil is arranged between the shell and the inner cylinder in the radial direction of the shell, and the heat exchange coil comprises a falling film area heat exchange section arranged between the shell and the inner cylinder from the first axial end of the shell to the second axial end and a full liquid area heat exchange section arranged from the falling film area heat exchange section to the second axial end of the shell; and

oil return device, including air duct, oil return portion and packing portion, the air duct with the gaseous business turn over port intercommunication of shell is including being located the first air duct in the gaseous phase district of inner tube is imported and exported, oil return portion includes one or more oil return opening, the oil return opening with being located of air duct first air duct import and export with the well kenozooecium intercommunication between the gaseous business turn over port, packing portion set up in the space of the second end of shell, just the oil return opening with packing portion follows the axial of shell is located be close to of liquid-full district heat transfer section the one end of falling liquid film district heat transfer section with between the internal face of the second end of shell.

In some embodiments, the packing includes a first packing located in a radially middle portion of the flooded section and/or a second packing located between the flooded section and an inner wall surface of the second end of the outer shell.

In the heat exchange device of some embodiments,

at least a part of the second packing body has a size larger than that of the first packing body in a radial direction of the outer shell and protrudes radially outward of the outer shell with respect to the first packing body; and/or

And the side surface of the second filling body and the inner wall surface of the shell are arranged at intervals along the radial direction of the shell, and the oil return port is positioned on one side, far away from the second end of the shell, of the second filling body along the axial direction of the shell.

In the heat exchange device of some embodiments, the first packing body is provided integrally with the second packing body.

In the heat exchange device of some embodiments,

the first filler comprises a first revolving body in the same axial direction as the housing; and/or

The second packing body includes a second solid of revolution in the same axial direction as the housing.

In the heat exchange device of some embodiments,

the first revolving body and the second revolving body are coaxially arranged; and/or

At least one of the first revolving body and the second revolving body is arranged coaxially with the housing.

In some embodiments, the heat exchange apparatus of the heat exchange coil comprises a falling film zone heat exchange section and a flooded zone heat exchange section, each of the falling film zone heat exchange section and the flooded zone heat exchange section comprises at least one coil section, the total height of the plurality of coil sections of the falling film zone heat exchange section and the flooded zone heat exchange section is h, the filling portion comprises the first filling body, the height of the first filling body is h5, and h5 ranges from h/4 to h/2.

In some embodiments, the falling film zone heat exchange section and the flooded zone heat exchange section of the heat exchange coil each include at least one coil section, the total height of the plurality of coil sections of the falling film zone heat exchange section and the flooded zone heat exchange section is h, the filling portion includes the first filling body, and the distance between the first gas duct inlet/outlet and the end of the first filling body away from the second end of the shell along the axial direction of the shell is h6, where h6> h/6.

In the heat exchange apparatus of some embodiments, the filling part includes the second filling body, and the second filling body is spaced from the inner wall of the outer shell by a distance h7 in a radial direction of the outer shell, wherein h7 ranges from 5mm to 40mm.

In some embodiments, the heat exchange apparatus further includes a second filling body, and the second end of the housing has a liquid outlet opposite to a radially outer side of the second filling body.

In the heat exchange apparatus of some embodiments, the filling part includes an accommodation space configured to communicate with a space of the second end of the housing outside the filling part to introduce the liquid of the space of the second end of the housing into the accommodation space, and the at least one oil return port is located in the accommodation space.

In the heat exchange apparatus of some embodiments, the accommodating space is located in a middle of the filling portion in a radial direction of the outer shell, and the filling portion further includes a communicating portion that communicates the accommodating space with a space of the second end of the outer shell located outside the filling portion to introduce the liquid of the space of the second end of the outer shell to the accommodating space.

In the heat exchange apparatus of some embodiments, the communication part includes one or more through holes provided at a bottom of the accommodating space to extend in a radial direction of the housing.

In the heat exchange device of some embodiments,

the air duct is positioned outside the filling part; or

And a part of the air duct is positioned in the accommodating space.

In the heat exchange device of some embodiments,

the oil return part comprises an oil return hole arranged on the pipe wall of the air guide pipe, and at least one oil return opening is the oil return hole; and/or

The oil return part comprises an oil return hole arranged on the tube wall of the air guide tube and a liquid guide tube communicated with the oil return hole, and at least one oil return port is positioned on the liquid guide tube; and/or

The oil return part comprises an oil return hole arranged on the tube wall of the air guide tube and a filter element communicated with the oil return hole, and at least one oil return port is positioned on the filter element; and/or

The oil return part comprises an oil return hole formed in the pipe wall of the air guide pipe, a filter element communicated with the oil return hole and a liquid guide pipe connected with the oil return hole and the filter element, and at least one oil return port is located in the filter element.

In some embodiments of the heat exchange device, the catheter is a capillary tube.

In the heat exchange apparatus of some embodiments, the oil return portion includes a plurality of the oil return ports, and at least two of the oil return ports among the plurality of the oil return ports have different heights.

In some embodiments of the heat exchange device, the gas-guide tube is a U-shaped tube.

In some embodiments of the heat exchange apparatus, the U-shaped tube is bent from a single tube or the U-shaped tube is welded from a plurality of straight tube sections.

In some embodiments, the air duct has a balance hole disposed on a duct wall, and the balance hole is located between the first air duct inlet/outlet and the gas inlet/outlet port along an axial direction of the housing.

In the heat exchange device of some embodiments,

the air guide pipe is positioned at the radial inner side of the inner barrel; or

One part of the air duct is positioned at the radial inner side of the inner barrel, and the other part of the air duct is positioned at the radial outer side of the inner barrel.

In some embodiments, the heat exchange apparatus further comprises a gas-liquid separation device configured to separate liquid droplets from the gas entering the gas-guide tube through the first gas-guide tube inlet/outlet.

In some embodiments, the gas-liquid separation device is disposed at the second end of the inner tube to separate liquid droplets in the gas entering the inner tube, and the first gas duct inlet/outlet is located between the gas-liquid separation device and the first end of the inner tube.

A second aspect of the present disclosure provides a refrigeration circuit including the heat exchange apparatus of the first aspect of the present disclosure.

A third aspect of the present disclosure provides an air conditioning apparatus including the heat exchange apparatus of the first aspect of the present disclosure.

Based on this heat exchange equipment that the disclosure provided, because filling portion sets up in the space of the second end of shell and is located between the inner wall face of the one end that is close to falling liquid film district heat transfer section of full liquid district heat transfer section and the second end of shell along the axial of shell, be provided with filling portion in full liquid district promptly, it can partly occupy full liquid district space, replaces the volume that the liquid refrigerant in full liquid district needs to fill, does benefit to and reduces refrigerant filling volume to reduce air conditioning equipment's cost. Meanwhile, the total amount of the liquid refrigerant in the liquid full area is reduced, and the content of lubricating oil which is mutually soluble with the liquid refrigerant is relatively increased, so that the lubricating content in the liquid sucked by the oil return port is increased, and the oil return effect is favorably improved.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure.

Fig. 2 and 3 are schematic sectional structural views of the embodiment shown in fig. 1.

Fig. 4 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure.

Fig. 5 is a schematic cross-sectional structure diagram of the embodiment shown in fig. 4.

Fig. 6 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure.

Fig. 7 is a schematic cross-sectional structure view of the embodiment shown in fig. 6.

Fig. 8 is a schematic cross-sectional structure diagram of an embodiment of the disclosure.

FIG. 9 is a schematic view of a U-tube in some alternative embodiments of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present disclosure, it should be understood that the terms "first," "second," and the like are used for limiting the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the above terms do not have special meanings, and therefore, should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are provided only for convenience of description and for simplicity of description, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1-9, embodiments of the present disclosure provide a heat exchange device. The heat exchange equipment comprises a tank type falling film heat exchanger 1 and an oil return device 2.

The can-type falling film heat exchanger 1 comprises an outer shell 11, an inner cylinder 12 and a heat exchange coil 13. The first end of the housing 11 has a liquid inlet port 1A and a gas inlet port 1C. The heat exchange coil 13 is disposed between the outer shell 11 and the inner tube 12 in a radial direction of the outer shell 11. The heat exchange coil 13 includes a falling film zone heat exchange section disposed between the outer shell 11 and the inner tube 12 from the first end to the second end of the outer shell 11 and a flooded zone heat exchange section disposed from the falling film zone heat exchange section to the second end of the outer shell 11.

The oil return device 2 includes an air duct 21, an oil return portion 22, and a filling portion 23. The gas duct 21 communicates with the gas inlet/outlet port 1C of the housing 11 and includes a first gas duct inlet/outlet port 21A located in the gas phase region of the inner barrel 12. The oil return portion 22 includes one or more oil return ports, the oil return port is communicated with a hollow portion of the air duct 21, which is located between the first air duct inlet/outlet port 21A and the gas inlet/outlet port 1C, the filling portion 23 is disposed in a space at the second end of the outer shell 11, and the oil return port and the filling portion 23 are located between one end of the heat exchange section of the flooded area, which is close to the heat exchange section of the falling film area, and an inner wall surface of the second end of the outer shell 11 along the axial direction of the outer shell 11.

Because the filling part 23 is arranged in the space of the second end of the outer shell 11 along the axial direction of the outer shell 11 and is positioned between one end of the heat exchange section of the flooded area, which is close to the heat exchange section of the falling film area, and the inner wall surface of the second end of the outer shell 11, namely the filling part 23 is arranged in the flooded area, the filling part can partially occupy the space of the flooded area, replace the volume of the liquid refrigerant in the flooded area to be filled, and is beneficial to reducing the refrigerant filling amount, thereby reducing the cost of the air conditioning equipment. Meanwhile, the total amount of the liquid refrigerant in the liquid full area is reduced, and the content of lubricating oil which is mutually soluble with the liquid refrigerant is relatively increased, so that the lubricating content in the liquid sucked by the oil return port is increased, and the oil return effect is favorably improved.

After the tank-type falling film heat exchanger 1 is installed, the axial direction of the shell 11 is the vertical direction, the axial first end of the shell 11 is positioned above the axial second end, and the gas phase area is positioned above the full liquid area. As shown in fig. 1 to 8, the first airway passage inlet/outlet 21A is located inside the inner tube 12 and between the gas inlet/outlet port 1C and the heat exchange section of the flooded area along the axial direction of the outer shell 11, so that the first airway passage inlet/outlet 21A is located in the gas phase area of the inner tube 12.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the filling part 23 includes a first filling body 231 located at a radial middle portion of the flooded area heat exchange section and/or a second filling body 232 located between the flooded area heat exchange section and an inner wall surface of the second end of the outer shell 11.

Set up first obturator 231 in the radial middle part of flooded area heat transfer section or set up second obturator 232 between the internal wall face that is located flooded area heat transfer section and the second end of shell 11, can make packing portion 23 occupy the radial middle part of flooded area heat transfer section or corresponding space between the internal wall face of flooded area heat transfer section and the second end of shell 11, make the corresponding part of packing portion 23 replace corresponding space, reduce originally should fill the liquid refrigerant to corresponding space in, be favorable to reducing the space that flooded area need fill liquid refrigerant, do benefit to and reduce the refrigerant volume of irritating, improve the oil return effect.

As shown in fig. 1 to 8, in the heat exchange device of some embodiments, in the radial direction of the outer shell 11, at least a portion of the second packing body 232 has a size larger than that of the first packing body 231 and protrudes radially outward of the outer shell 11 with respect to the first packing body 231; and/or along the radial direction of the outer shell 11, the side surface of the second filling body 232 is arranged at an interval with the inner wall surface of the outer shell 11; and/or the oil return port is located on a side of the second packing body 232 away from the second end of the housing 11 in the axial direction of the housing 11.

At least one part of the second filling body 232 is larger than the first filling body 231 in the radial direction of the outer shell 11 and protrudes outward in the radial direction of the outer shell 11 relative to the first filling body 231, so that the second filling body 232 occupies a larger space of the liquid full area, the refrigerant filling amount is reduced, and the oil return effect is improved.

The side surface of the outer shell 11 of the second filler 232 and the inner wall surface of the outer shell 11 are arranged at intervals along the radial direction of the outer shell 11, so that the liquid refrigerant is in the interval between the side surface of the second filler 232 and the inner wall surface of the outer shell 11, the content of gas in the liquid refrigerant in the interval is less than that in other parts of the liquid full area due to less disturbance, and the gas carried by the refrigerant can be reduced by leading out the refrigerant from the interval when the liquid refrigerant is discharged.

The oil return opening is located on one side of the second filling body 232, which is far away from the second end of the housing 11, along the axial direction of the housing 11, so that disturbance to a liquid refrigerant on the outer side of the side surface of the second filling body 232 when the fluid enters and exits the air duct 21 through the oil return opening is reduced.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the first packing 231 is integrally provided with the second packing 232.

The integral arrangement of the first filling body 231 and the second filling body 232 facilitates the manufacturing and molding of the filling part 23 and also facilitates the positioning and assembling of the filling part 23 and the housing 11 more quickly.

As shown in fig. 1 to 8, in the heat exchange device of some embodiments, the first packing 231 includes a first solid of revolution in the same axial direction as the housing 11; and/or the second packing body 232 includes a second solid of revolution in the same axial direction as the housing 11.

The first filling body 231 comprises a first revolving body or a second filling body 232 which is the same as the axial direction of the shell 11 comprises a second revolving body which is the same as the axial direction of the shell 11, so that the distance between the first filling body 231 or the second filling body 232 and the coil section of the heat exchange section in the liquid full area is more uniform, the fully flowing refrigerant around the coil section of the heat exchange section in the liquid full area participates in the heat exchange between the heat exchange sections in the liquid full area, and the influence of the filling part 23 on the heat exchange sections in the liquid full area is reduced.

As shown in fig. 1-8, in some embodiments of the heat exchange apparatus, the first and second rotors are coaxially arranged; and/or at least one of the first and second rotors is disposed coaxially with housing 11.

The first revolving body is arranged to be coaxial with the second revolving body, or at least one of the first revolving body and the second revolving body is arranged to be coaxial with the shell 11, so that a proper distance is kept between the first revolving body and a coil section of the heat exchange section of the full-hot area or between the second revolving body and the inner wall surface of the shell 11 along the radial direction of the shell 11, and the heat exchange influence of the first revolving body and the second revolving body on the coil section of the heat exchange section of the full-hot area is reduced.

As shown in fig. 1-8, in some embodiments of the heat exchange apparatus, the falling film zone heat exchange section and the flooded zone heat exchange section of heat exchange coil 13 each include at least one coil section. As shown in fig. 3, the total height of the plurality of coil sections of the falling film heat exchange section and the liquid full heat exchange section is h, the filling part 23 comprises a first filling body 231, the height of the first filling body 231 is h5, wherein h5 ranges from h/4 to h/2.

The proper height of the first filling body 231 is set, so that sufficient refrigerants are reserved for the flooded area while the space of the flooded area is occupied to a large extent to reduce the filling amount of the refrigerants, and all parts of the heat exchange section of the flooded area are in contact with the liquid refrigerants to perform sufficient heat exchange.

As shown in fig. 1-8, in some embodiments of the heat exchange apparatus, the falling film zone heat exchange section and the flooded zone heat exchange section of heat exchange coil 13 each include at least one coil section. As shown in fig. 3, the total height of the plurality of coil sections of the falling film heat exchange section and the flooded heat exchange section is h, the filling portion 23 includes a first filling body 231, and the distance between the first gas guide inlet/outlet 21A and the end of the first filling body 231 far away from the second end of the outer shell 11 along the axial direction of the outer shell 11 is h6, where h6> h/6.

The distance between the first air duct inlet/outlet 21A and the top of the first filling body 231, which is far away from the second end of the housing 11, is reasonably set, which is beneficial to ensuring that less liquid drops are carried in the gas inhaled by the first air duct inlet/outlet 21A.

In the heat exchange apparatus of some embodiments, the filling part 23 includes the second filling body 232, and the second filling body 232 is spaced from the inner wall of the outer shell 11 by a distance h7 in the radial direction of the outer shell 11, wherein h7 ranges from 5mm to 40mm.

The distance between the radial second filling body 232 of the outer shell 11 and the inner wall of the outer shell 11 is reasonably set, and a stable liquid refrigerant area is formed at the bottom of the heat exchange section of the liquid full area.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the filling portion 23 includes a second filling body 232, the second end of the housing 11 has a liquid outlet 1B, and the liquid outlet 1B is opposite to a side surface radially outside the second filling body 232.

The liquid outlet 1B is opposed to the side surface of the radial outer side of the second filling body 232, so that the liquid outlet 1B is facilitated to discharge the liquid refrigerant from the space between the radial outer side of the second filling body 232 and the inner wall surface of the housing 11, and the liquid refrigerant is facilitated to be prevented from carrying gas.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the filling part 23 includes an accommodating space 23A, the accommodating space 23A is configured to communicate with a space of the second end of the outer shell 11 outside the filling part 23 to introduce the liquid of the space of the second end of the outer shell 11 into the accommodating space 23A, and at least one oil return port is located in the accommodating space 23A.

The liquid refrigerant in the accommodating space 23A is more stable because of being difficult for the disturbed state, forms rich oil district 1D gradually in the accommodating space 23A, and the oil return opening draws liquid refrigerant from rich oil district 1D, can be with more lubricating oil suction in the air duct to improve the oil return effect.

As shown in fig. 4 and 5, in the heat exchange apparatus of some embodiments, the accommodating space 23A is located in a middle portion of the filling portion 23 in a radial direction of the outer shell 11, and the filling portion 23 further includes a communicating portion 23B, and the communicating portion 23B communicates the accommodating space 23A with a space at the second end of the outer shell 11 located outside the filling portion 23 to introduce the liquid in the space at the second end of the outer shell 11 into the accommodating space 23A.

Through setting up accommodation space 23A in the middle part of filling portion 23, liquid in the space of the second end of shell 11 is introduced into accommodation space 23A through intercommunication portion 23B, does benefit to and forms more stable rich oil district in accommodation space 23A to do benefit to and improve the oil return effect.

As shown in fig. 4 and 5, in the heat exchange apparatus of some embodiments, the communication portion 23B includes one or more through holes extending in a radial direction of the housing 11 provided at the bottom of the accommodating space 23A.

The communicating part 23B is arranged to include one or more through holes which are located at the bottom of the accommodating space 23A and extend along the radial direction of the shell 11, so that liquid in the accommodating space 23A can be supplemented in time, and the content of lubricating oil carried by gas in the gas guide tube 21 can be guaranteed.

As shown in fig. 1 to 5 and 8, in some embodiments of the heat exchange device, the gas-guide tube 21 is located outside the filling part 23.

As shown in fig. 6 and 7, in some embodiments of the heat exchange device, a portion of the air duct 21 is located in the accommodating space 23A.

The relative positions of the air duct 21 and the filling part 23 can be flexibly set according to the structures and the sizes of the oil return part 22 and the filling part 23, and the flexibility of the oil return device 2 is improved.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the oil return portion 22 includes an oil return hole 221 disposed on a tube wall of the air duct 21, and at least one oil return port is the oil return hole 221; and/or

The oil return part 22 comprises an oil return hole 221 arranged on the tube wall of the gas guide tube 21 and a liquid guide tube 222 communicated with the oil return hole 221, and at least one oil return port is positioned on the liquid guide tube 222; and/or

The oil return part 22 comprises an oil return hole 221 arranged on the tube wall of the air duct 21 and a filter element 223 communicated with the oil return hole 221, and at least one oil return port is positioned on the filter element 223; and/or

The oil return part 22 comprises an oil return hole 221 arranged on the tube wall of the air duct 21, a filter element 223 communicated with the oil return hole 221 and a liquid guide tube 222 connecting the oil return hole 221 and the filter element 223, and at least one oil return port is positioned on the filter element 223.

At least one oil return port is an oil return hole 221, which is beneficial to simplifying the structure of the oil return part. At least one oil return port is positioned on the liquid guide pipe 222, which is beneficial to shortening the length of the air guide pipe 21 and reducing the weight of the oil return device. At least one oil return port is located on the filter element 223, which is beneficial to filtering impurities of liquid refrigerant entering the oil return port, and improving the cleanliness of the refrigerant in the refrigerant loop.

Wherein, in some embodiments of the heat exchange device, the catheter 222 is a capillary tube.

The liquid guide tube 222 is a capillary tube, and the capillary action of the capillary tube draws the liquid refrigerant from the oil return port into the air guide tube 21.

As shown in fig. 6 and 7, in the heat exchange apparatus of some embodiments, the oil returning part 22 includes a plurality of oil returning ports, and at least two of the plurality of oil returning ports have different heights.

The height of at least two oil return openings in the plurality of oil return openings is different, so that oil return from different liquid level heights is facilitated, and the oil return stability of the oil return device 2 is improved.

In some embodiments of the heat exchange device, the gas guiding tube 21 is a U-shaped tube.

The air duct 21 is a U-shaped tube, which is beneficial to sucking away the lubricating oil which is mutually soluble with the liquid refrigerant in the liquid-full area by utilizing the entrainment effect of the U-shaped tube.

As shown in fig. 1 to 8, in the heat exchange apparatus of some embodiments, the U-shaped tube is bent from a single tube.

The U-shaped pipe is formed by bending a single pipe, and fluid in the U-shaped pipe can smoothly flow.

As shown in fig. 1 to 9, in the heat exchange apparatus of some embodiments, the U-shaped tube is welded from a plurality of straight tube sections.

The U-shaped pipe is formed by welding a plurality of straight pipe sections, so that the distance between two straight pipe sections of the U-shaped pipe is smaller, and the U-shaped pipe is favorably arranged in a narrower space.

As shown in fig. 1 to 3, in the heat exchange device of some embodiments, the air duct 21 has a balance hole 21C disposed on the duct wall, and the balance hole 21C is located between the first air duct inlet/outlet port 21A and the gas inlet/outlet port 1C in the axial direction of the housing 11.

The air duct 21 is provided with a balance hole 21C which can balance the air pressure inside and outside the air duct 21 and is beneficial to the oil return amount.

As shown in fig. 1 to 7, in some embodiments of the heat exchange device, the gas guide tube 21 is located radially inside the inner tube 12.

The air guide tube 21 is arranged on the radial inner side of the inner barrel 12, concentric arrangement of the inner barrel 12 and the shell 11 is facilitated, approximation of heat exchange environment of each part of the heat exchange coil 13 along the circumferential direction is facilitated, and accordingly heat exchange efficiency of the tank-type falling film heat exchanger 1 is improved.

As shown in fig. 8, in some embodiments of the heat exchange device, a part of the gas guide tube 21 is located at the radial inner side of the inner tube 12, and another part is located at the radial outer side of the inner tube 12.

One part of the air duct 21 is positioned at the radial inner side of the inner barrel 12, and the other part is arranged at the radial outer side of the inner barrel 12, so that the arrangement of the air duct is more flexible, and the oil return device 2 can be arranged when the inner diameter of the inner barrel 12 is smaller.

As shown in fig. 8, in the heat exchange apparatus of some embodiments, the tank-type falling film heat exchanger 1 further includes a gas-liquid separation device 16, and the gas-liquid separation device 16 is configured to separate liquid droplets in the gas entering the gas guide tube 21 through the first gas guide tube inlet/outlet 21A.

In some embodiments of the heat exchange apparatus, the gas-liquid separation device 16 is disposed at the second end of the inner drum 12 to separate liquid droplets in the gas entering the inner drum 12, and the first gas inlet/outlet 21A is located between the gas-liquid separation device 16 and the first end of the inner drum 12.

The provision of the gas-liquid separation device 16 facilitates the reduction of liquid droplets entrained in the gas duct 21.

The disclosed embodiment also provides a refrigeration circuit. The refrigeration circuit includes a heat exchange apparatus of an embodiment of the present disclosure. The refrigeration circuit of the disclosed embodiment has the advantages that the heat exchange device of the disclosed embodiment has.

The embodiment of the disclosure also provides an air conditioning device which comprises the heat exchange device of the embodiment of the disclosure.

The refrigeration circuit of the embodiment of the present disclosure has the advantages that the heat exchange device of the embodiment of the present disclosure has.

Embodiments of the present disclosure are described in more detail below with reference to fig. 1 to 9. In the embodiment shown in fig. 1 to 9, the direction of each heat exchange device is the same as the installed direction, wherein the axis of the shell 11 is vertically arranged, the first end of the shell 11 corresponds to the upper end in fig. 1 to 9, and the second end of the shell 11 corresponds to the lower end in fig. 1 to 9. In the following description, the description of the direction or orientation may be described in the direction or orientation shown in fig. 1 to 9 in addition to the direction of the housing 11, for example, the first end of the housing 11 or the inner tube 12 may be described by the upper end or top end of the housing 11 or the inner tube 12, the second end of the housing 11 or the inner tube 12 may be described by the lower end or bottom end, and the like.

Fig. 1 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure. Fig. 2 and 3 are schematic cross-sectional views of the embodiment shown in fig. 1. As shown in fig. 1 to 3, some embodiments of the present disclosure provide a heat exchange apparatus including a pot-type falling film heat exchanger 1 and an oil return device 2.

The tank type falling film heat exchanger 1 comprises an outer shell 11, an inner cylinder 12, a heat exchange coil 13, a liquid distributor 14 and a liquid equalizing plate 15.

The housing 11 includes an outer cylinder 111, a first cover 112 covering a first end of the outer cylinder 111, and a second cover 113 covering a second end of the cylinder 111. The housing 11 has a liquid inlet port 1A, a liquid outlet port 1B, and a gas inlet and outlet port 1C. The liquid inlet port 1A and the gas inlet port 1C are both disposed at a first end of the housing 11. As shown in fig. 1 to 3, the liquid inlet port 1A and the gas inlet port 1C are both provided on the first cover 112. The liquid outlet 1B is disposed at a second end of the housing 11. As shown in fig. 1 to 3, the liquid outlet 1B is disposed on a sidewall of the second end of the outer cylinder 111.

As shown in fig. 1 to 3, a first end of the inner cylinder 12 is fixed to a first end of the outer housing 11, and a second end of the inner cylinder 12 is spaced apart from a second end of the outer housing 11. The upper end of the inner cylinder 12 is fixedly connected to the inner wall surface of the first cover 112 of the housing 11. The liquid inlet 1A is located between the outer cylinder 111 and the inner cylinder 12 in the radial direction of the outer shell 11. The gas inlet and outlet port 1C is located inside the inner tube 12 in the radial direction of the outer casing 11. The lower end of the inner cylinder 12 is spaced apart from the inner wall surface of the second lid 113 of the housing 11. The inner cylinder 12 is disposed coaxially with the outer housing 11.

The heat exchange coil 13 is disposed between the outer shell 11 and the inner tube 12 in a radial direction of the outer shell 11. The heat exchange coil 13 includes a falling film zone heat exchange section disposed between the outer shell 11 and the inner tube 12 from the first end to the second end of the outer shell 11 and a flooded zone heat exchange section disposed from the falling film zone heat exchange section to the second end of the outer shell 11.

The falling film zone heat exchange section and the flooded zone heat exchange section of heat exchange coil 13 each include at least one coil section. The coil sections may be single-layered or multi-layered in the radial direction of the shell 11, and the coil sections may be single-layered or multi-layered in the radial direction of the shell 11. The coil pipe length, the number of turns, the number of internal and external layers of different heat exchange sections may be the same or different, and the coil pipe length, the number of turns, the number of internal and external layers of different coil pipe sections of the same heat exchange section may be the same or different.

As shown in fig. 1-3, in some embodiments of the present disclosure, the falling film zone heat exchange section includes a first coil section 131 located below the liquid distributor 14 and a second coil section 131 located below the first coil section 131. The first coil section 131 and the second coil section 132 and the surrounding space thereof constitute a membrane reduction region. The flooded area heat exchange section is located below the falling film area heat exchange section and includes a third coil section 133 located below the second coil section 132. The top of the third coil section 133 and its area below it form a flooded area. In this embodiment, the bottom end of the inner cylinder 12 is suspended above the third coil section 133 and is communicated with the falling film region.

The liquid distributor 14 can uniformly distribute the liquid refrigerant on the heat exchange section of the falling film area. The liquid distributor 14 includes two flat cylinders sleeved inside and outside, an upper annular plate connecting the upper ends of the two flat cylinders, and a lower annular plate connecting the lower ends of the two flat cylinders, and the liquid distributor 14 is coaxial with the outer cylinder 111 and is mounted on the first cover 112. The upper annular plate is open at a position opposite to the liquid inlet 1A, so that the annular space inside the liquid distributor 14 is communicated with the liquid inlet 1A, and the liquid entering the shell 11 from the liquid inlet 1A is received. The lower annular plate is provided with a plurality of first through holes 14A. The liquid in the annular space of the liquid distributor 14 flows uniformly through the lower annular plate and then flows downwards from the first through holes 14A to the falling film area, falls on the heat exchange section of the falling film area, and performs film type heat exchange with the heat exchange section of the falling film area. In some alternative embodiments, it is also possible to arrange more layers of annular plates with a plurality of first perforations, which are arranged at a distance from the upper and lower annular plates.

Along the axial direction of the shell 11, the liquid-equalizing disc 15 is arranged between the first coil pipe section 131 and the second coil pipe section 132, the liquid-equalizing disc 15 is provided with a plurality of second through holes 15A, the liquid-equalizing disc 15 can evenly arrange the liquid refrigerant flowing through the first coil pipe section 131 on the second coil pipe section 132, and the heat exchange efficiency of the second coil pipe section 132 and the liquid refrigerant is high.

As shown in fig. 1 to 3, the oil return device 2 includes an air duct 21, an oil return portion 22, and a filling portion 23.

The airway tube 21 communicates with the gas inlet and outlet port 1C of the housing 11 and includes a first airway tube port 21A. The first gas duct inlet/outlet 21A is located inside the inner cylinder 12 and between the gas inlet/outlet port 1C and the heat exchange section of the flooded area along the axial direction of the outer shell 11. The air duct 21 is a U-shaped tube. The U-shaped pipe is formed by bending a single pipe. The two straight tube sections of the gas-guide tube 21 are different in length. The first airway inlet/outlet 21A is the port of a shorter straight tube section of the U-tube. The port of the longer straight tube section of the air duct 21 is a second air duct inlet/outlet 21B. The longer straight tube section of the air duct passes out from the air inlet/outlet port 1C, so that the air duct 21 allows the air entering the first air duct inlet/outlet port 21A to flow through the air inlet/outlet port 1C and then flow out of the housing 11 through the second air duct inlet/outlet port 21B.

As shown in fig. 1 to 3, the air duct 21 has a balance hole 21C formed in the duct wall, and the balance hole 21C is located between the first air duct inlet/outlet port 21A and the gas inlet/outlet port 1C in the axial direction of the housing 11.

The oil return portion 22 includes an oil return port, the oil return port is communicated with a hollow portion of the air duct 21, which is located between the first air duct inlet/outlet 21A and the gas inlet/outlet port 1C, and the oil return port is located between one end of the heat exchange section of the liquid-full area, which is close to the heat exchange section of the falling film area, and an inner wall surface of the second end of the housing 11 along the axial direction of the housing 11. The oil return port is communicated with the hollow part at the lowest end of the bent pipe part of the U-shaped pipe. The U-shaped tube is located inside the inner tube 12 in the radial direction of the outer shell 11.

As shown in fig. 1 to 3, the oil return portion 22 includes an oil return hole 221 disposed on the tube wall of the air duct 21, a filter element 223 communicated with the oil return hole 221, and a liquid guide tube 222 connecting the oil return hole 221 and the filter element 223, and at least one oil return port is located on the filter element 223. The liquid guide tube 222 is a capillary tube. In this embodiment, the filter element 223 is embodied as a filter, and includes a mounting portion at an upper portion and a filter screen at a lower portion, and an upper end of the mounting portion is connected to a bottom end of the liquid guide tube 222. The lower end of the mounting part is connected with the filter screen. The oil return port comprises a plurality of meshes of the filter screen.

The filling portion 23 is disposed in the space of the second end of the outer shell 11 and located between one end of the heat exchange section in the flooded area close to the falling film heat exchange section and the inner wall surface of the second end of the outer shell 11, that is, the filling portion 23 is disposed in the bottom space of the outer shell 11 and located between the outer edge of the upper end of the heat exchange section in the flooded area and the inner wall surface of the bottom of the outer shell 11.

The filling portion 23 may be made of nylon, plastic, or the like.

As shown in fig. 1 to 3, the filling part 23 includes a first filling body 231 located at a radial middle portion of the flooded area heat exchange section and a second filling body 232 located between the flooded area heat exchange section and an inner wall surface of the second end of the outer shell 11. The first filling body 231 is integrally provided with the second filling body 232.

As shown in fig. 1 to 3, the second filling body 232 has a size larger than that of the first filling body 231 in the radial direction of the housing 11 and protrudes radially outward of the housing 11 with respect to the first filling body 231. Along the radial direction of the housing 11, the side surface of the second filling body 232 is spaced from the inner wall surface of the housing 11, and the oil return port is located on the side of the second filling body 232 far from the second end of the housing 11 along the axial direction of the housing 11, that is, on the upper side of the second filling body 232. As shown in fig. 1 to 3, the filling portion 23 includes a second filling body 232, and the second end of the housing 11 has a liquid outlet 1B, where the liquid outlet 1B is opposite to a side surface on the radially outer side of the second filling body 232.

As shown in fig. 1 to 3, in the heat exchange device of some embodiments, the first packing 231 includes a first rotation body in the same axial direction as the housing 11, and the second packing 232 includes a second rotation body in the same axial direction as the housing 11. In fig. 1 to 3, both the first revolving body and the second revolving body are cylindrical bodies. In the embodiment not shown in the drawings, the first rotor and the second rotor may have other shapes, and for example, the first rotor and the second rotor may be rotors whose generatrices are straight lines or broken lines inclined from their axes, may be rotors whose generatrices are curved lines recessed or projected toward their axes, or may be rotors whose generatrices are a combination of straight lines and curved lines.

As shown in fig. 1 to 3, the first rotor, the second rotor, and the housing 11 are coaxially disposed.

As shown in fig. 3, the total height of the multiple coil sections of the falling film zone heat exchange section and the flooded zone heat exchange section is h. Wherein, the height of the first coil section 131 is h1, the height of the second coil section 132 is h2, the height of the third coil section 133 is h3, and the total height h is the sum of h1, h2 and h 3. H4 in fig. 3 is a radius of the inner space of the housing 11. The filling part 23 includes a first filling body 231, and the height of the first filling body 231 is h5, wherein h5 ranges from h/4 to h/2. E.g., h5= h/3. h5 is in the range, which is favorable for matching the liquid level height of the liquid full zone. The liquid level height of the flooded area is related to the proportion of the heat exchange area of the heat exchange section of the flooded area to the total heat exchange area of the heat exchange coil, and the proportion is generally 25-50%. The first air duct access 21A is at a distance h6 from the end of the first obturator 231 remote from the second end of the housing 11 in the axial direction of the housing 11, wherein h6> h/6. For example, h6= h/4. The range of h6 is reasonably set, so that larger liquid drops can be prevented from splashing to enter the first air duct inlet and outlet 21A, and the phenomenon that air suction is carried with liquid is prevented. The second filling body 232 has a distance h7 from the inner wall of the housing 11 along the radial direction of the housing 11, wherein h7 ranges from 5mm to 40mm. For example, h7 may be 25mm. The size of h7 is reasonably set, so that stable liquid refrigerant can be formed in the space between the second filling body 232 and the shell 11, and meanwhile, sundries are prevented from blocking the liquid outlet 1B.

As shown in fig. 1 to 3, the filling part 23 includes an accommodating space 23A, the accommodating space 23A is configured to communicate with a space at the second end of the housing 11 outside the filling part 23 to introduce the liquid in the space at the second end of the housing 11 into the accommodating space 23A, and at least one oil return port is located in the accommodating space 23A. In the embodiment shown in fig. 1 to 3, the accommodating space 23A is an installation groove arranged along the radial direction of the first rotator. The depth of the mounting groove is greater than the radius of the first revolving body. The filter and the catheter 232 are located approximately in the radial middle of the first rotor.

As shown in fig. 1 to 3, in the heat exchange device of some embodiments, the air guide tube 21 is located outside the filling part 23.

In this embodiment, an installation groove is formed in the side surface of the first rotating body of the filling portion 23 serving as the first filling body 231 to serve as the accommodating space 23A, and the solid portion of the filling portion 23 fills the space of the liquid full region, so that the filling amount of the refrigerant of the refrigeration circuit and the air conditioning equipment where the heat exchange equipment is located is reduced, and an oil rich region is generated in the accommodating space 23A. The lower end of the capillary tube and the filter tip extend into the accommodating space 23A, and the liquid refrigerant in the oil-rich area is continuously sucked through the entrainment pressure difference of the U-shaped tube, so that the oil return purpose is achieved.

The installation groove formed in the filling part 23 is not limited to the straight shape shown in fig. 1 to 3, and may have any shape that allows the capillary tube and the filter to be inserted into the installation groove. The capillary need not be positioned vertically downward as shown in fig. 1-3, but may be positioned at an angle.

The heat exchange device of the disclosed embodiment can be applied to a refrigeration circuit or an air conditioning device. The refrigerating circuit or the air conditioning equipment can comprise a compressor, a first heat exchanger, a throttling device and a second heat exchanger which are sequentially connected through a refrigerant pipeline, and can also comprise a four-way valve for switching the flow direction of the refrigerant if the refrigerating circuit or the air conditioning equipment can refrigerate and can also heat. The heat exchange device of the present embodiment may be used as a first heat exchanger or a second heat exchanger of a refrigeration circuit or an air conditioning device.

When the heat exchanger apparatus is used as an evaporator, the third coil section 133 is filled with liquid refrigerant. The liquid refrigerant volume in the flooded area is reduced by the filling portion 23, and the agitation of the liquid refrigerant in the flooded area is reduced. So that the lubricating oil (the density is slightly larger than that of the refrigerant and is partially soluble with the refrigerant) is deposited at the bottom and forms an oil-rich area 1D. The capillary tube connected with the U-shaped tube and the filter tip on the capillary tube extend into the mounting groove of the filling part. The liquid refrigerant mixed with the lubricating oil enters the capillary after fine foreign matters are filtered by the filter tip. The liquid refrigerant entering the interior of the housing 11 is heated and evaporated into a gaseous refrigerant by the heat exchange coil 13. The gaseous refrigerant enters from the first gas inlet/outlet 21A of the U-shaped pipe and flows out of the heat exchange device from the second gas inlet/outlet 21B of the U-shaped pipe through the gas inlet/outlet port 1C. The gas entering the U-shaped pipe forms a high-speed gas flow field in the U-shaped pipe, and the gaseous refrigerant flowing at high speed in the U-shaped pipe sucks the liquid refrigerant mixed with the lubricating oil through the oil return hole 221 on the gas refrigerant, and the liquid refrigerant is taken out of the heat exchange equipment and flows back to the compressor.

When the heat exchange device is used as a condenser, gas enters the U-shaped pipe from the second gas inlet/outlet 21B and flows out from the first gas inlet/outlet 21A to enter the inner cylinder 12, so that the inner space of the whole shell 11 is filled with the gas, and the gas is condensed on the surface of the heat exchange coil 13. At this time, a liquid seal is formed between the second filling body 232 of the filling portion 23 and the outer cylinder 112, and the gas is prevented from flowing out of the liquid outlet 1B without being condensed.

Fig. 4 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure. Fig. 5 is a schematic cross-sectional structure diagram of the embodiment shown in fig. 4. The heat exchange devices of some embodiments as shown in fig. 4 and 5 differ from the embodiments shown in fig. 1 to 3 in that:

the air duct 21 is not provided with a balance hole. The accommodating space 23A is located in the middle of the filling portion 23 along the radial direction of the housing 11, and the filling portion 23 further includes a communicating portion 23B, and the communicating portion 23B communicates the accommodating space 23A with the space at the second end of the housing 11 located outside the filling portion 23 to introduce the liquid in the space at the second end of the housing 11 into the accommodating space 23A. The communicating portion 23B includes two through holes provided at the bottom of the accommodating space 23A and extending in the radial direction of the housing 11.

The non-illustrated portions of the embodiments corresponding to fig. 4 to 5 may refer to the related description of the embodiments corresponding to fig. 1 to 3.

Fig. 6 is a schematic perspective cross-sectional structure diagram according to an embodiment of the disclosure. Fig. 7 is a schematic cross-sectional structure view of the embodiment shown in fig. 6. Some embodiments of the heat exchange device as shown in fig. 6 and 7 differ from the embodiments shown in fig. 1 to 3 in that:

the air duct 21 is not provided with a balance hole. A part of the air duct 21 is located in the accommodating space 23A. The oil return portion 22 has three oil return ports having different heights. The oil return portion 22 includes three oil return holes 221 formed in the wall of the air duct 21 and a filter element 223 communicating with the oil return hole 221 located at the lowest point, and an oil return port is located on the filter element 223. The filter element 223 is directly connected to the corresponding oil return port 221. The two oil return ports at the higher positions are two oil return holes 221 arranged on the tube wall of the air duct 21.

The non-illustrated portions of the embodiments corresponding to fig. 6 to 7 may refer to the related description of the embodiments corresponding to fig. 1 to 3.

Fig. 8 is a schematic cross-sectional structure diagram of an embodiment of the disclosure. The heat exchange device of the embodiment shown in fig. 8 differs from the embodiment shown in fig. 1 to 3 in that:

the inner cylinder 12 is eccentrically disposed from the outer housing 11. The gas inlet and outlet port 1C is located between the outer cylinder 111 and the inner cylinder 12 in the radial direction of the outer casing 11. One part of the gas-guide tube 21 is located at the radially inner side of the inner cylinder 12, and the other part is located at the radially outer side of the inner cylinder 12. The straight tube section where the first air duct inlet/outlet 21A of the U-shaped tube is located on the radial inner side of the inner tube 12, and the other straight tube section is located on the radial outer side and communicated with the gas inlet/outlet port 1C.

In addition, as shown in fig. 8, the can-type falling film heat exchanger 1 further includes a gas-liquid separation device 16, and the gas-liquid separation device 16 is configured to separate liquid droplets in the gas entering the gas guide tube 21 through the first gas guide tube inlet/outlet 21A. The gas-liquid separation device 16 is disposed at the second end of the inner barrel 12 to separate liquid droplets in the gas entering the inner barrel 12, and the first gas duct inlet/outlet 21A is located between the gas-liquid separation device 16 and the first end of the inner barrel 12. The gas-liquid separation device 16 includes, for example, a perforated plate and/or a screen.

The non-illustrated portions of the embodiment corresponding to fig. 8 may refer to the related description of the embodiments corresponding to fig. 1 to 3.

FIG. 9 is a schematic view of a U-tube according to some alternative embodiments of the present disclosure. Wherein the U-shaped tube of the air duct 21 is formed by welding a plurality of straight tube sections. The U-shaped tube disclosed in FIG. 9 may be substituted for the U-shaped tube of any of the embodiments described above.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solution of the present disclosure and not to limit it; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the disclosure or equivalent replacements of parts of the technical features may be made, which are all covered by the technical solution claimed by the disclosure.

Claims (25)

1. A heat exchange apparatus, comprising:

the pot-type falling film heat exchanger (1) comprises an outer shell (11), an inner cylinder (12) and a heat exchange coil (13), wherein a liquid inlet (1A) and a gas inlet and outlet port (1C) are formed in the first axial end of the outer shell (11), the heat exchange coil (13) is arranged between the outer shell (11) and the inner cylinder (12) in the radial direction of the outer shell (11), and the heat exchange coil (13) comprises a falling film area heat exchange section arranged between the outer shell (11) and the inner cylinder (12) from the first axial end of the outer shell (11) to the second axial end and a full liquid area heat exchange section arranged from the falling film area heat exchange section to the second end of the outer shell (11); and

oil return device (2), including air duct (21), oil return portion (22) and filling portion (23), air duct (21) with the gas of shell (11) advances exit port (1C) intercommunication and including being located the well kenozooecium intercommunication between the gaseous phase district of inner tube (12), oil return portion (22) include one or more oil return opening, the oil return opening with being located of air duct (21) first air duct is imported and exported (21A) with the well kenozooecium intercommunication between the gaseous phase district that advances exit port (1C), filling portion (23) set up in the space of the second end of shell (11), just the oil return opening with filling portion (23) are followed the axial of shell (11) is located be close to of liquid-full district heat transfer section the one end of falling liquid film district heat transfer section with between the internal face of the second end of shell (11).

2. A heat exchange apparatus according to claim 1, characterised in that the filler (23) comprises a first filler (231) located in a radially middle portion of the flooded area heat exchange section and/or a second filler (232) located between the flooded area heat exchange section and an inner wall surface of the second end of the outer shell (11).

3. Heat exchange device according to claim 2,

at least a part of the second packing body (232) has a size larger than that of the first packing body (231) in a radial direction of the outer shell (11) and protrudes radially outward of the outer shell (11) with respect to the first packing body (231); and/or

The side surface of the second filling body (232) is arranged at an interval with the inner wall surface of the shell (11) along the radial direction of the shell (11); and/or

The oil return opening is located on one side, away from the second end of the outer shell (11), of the second filling body (232) along the axial direction of the outer shell (11).

4. Heat exchange device according to claim 2, characterised in that said first packing body (231) is integral with said second packing body (232).

5. Heat exchange device according to claim 2,

the first packing (231) includes a first rotational body in the same axial direction as the housing (11); and/or

The second packing body (232) includes a second rotational body in the same axial direction as the housing (11).

6. Heat exchange device according to claim 5,

the first revolving body and the second revolving body are coaxially arranged; and/or

At least one of the first and second rotators is disposed coaxially with the housing (11).

7. A heat exchange device according to claim 2, wherein the falling film zone heat exchange section and the flooded zone heat exchange section of the heat exchange coil (13) each comprise at least one coil section, the total height of the plurality of coil sections of the falling film zone heat exchange section and the flooded zone heat exchange section is h, the packed section (23) comprises the first packing body (231), the height of the first packing body (231) is h5, wherein h5 ranges from h/4 to h/2.

8. A heat exchange device according to claim 2, wherein the falling film zone heat exchange section and the flooded zone heat exchange section of the heat exchange coil (13) each comprise at least one coil section, the total height of the falling film zone heat exchange section and the plurality of coil sections of the flooded zone heat exchange section is h, the filling section (23) comprises the first filling body (231), and the first gas duct inlet/outlet (21A) is at a distance h6 from the end of the first filling body (231) away from the second end of the shell (11) in the axial direction of the shell (11), wherein h6> h/6.

9. A heat exchange apparatus according to claim 2, characterized in that the filling portion (23) includes the second filling body (232), and the second filling body (232) is at a distance h7 from the inner wall of the outer shell (11) in the radial direction of the outer shell (11), wherein h7 ranges from 5mm to 40mm.

10. The heat exchange apparatus according to claim 2, wherein the filling portion (23) includes the second filling body (232), and the second end of the outer shell (11) has a liquid outlet (1B), the liquid outlet (1B) being opposite to a radially outer side of the second filling body (232).

11. The heat exchange apparatus according to any one of claims 1 to 10, wherein the filling portion (23) includes an accommodation space (23A), the accommodation space (23A) is configured to communicate with a space of the second end of the housing (11) outside the filling portion (23) to introduce the liquid of the space of the second end of the housing (11) to the accommodation space (23A), and at least one of the oil return ports is located in the accommodation space (23A).

12. The heat exchange apparatus according to claim 11, characterized in that the accommodation space (23A) is located in a middle of the filling portion (23) in a radial direction of the shell (11), and the filling portion (23) further includes a communication portion (23B) that communicates the accommodation space (23A) with a space of the second end of the shell (11) located outside the filling portion (23) to introduce the liquid of the space of the second end of the shell (11) into the accommodation space (23A).

13. The heat exchange device according to claim 12, characterised in that the communication portion (23B) comprises one or more through holes extending in a radial direction of the shell (11) provided at the bottom of the accommodation space (23A).

14. Heat exchange device according to claim 11,

the air duct (21) is positioned outside the filling part (23); or

A part of the air duct (21) is positioned in the accommodating space (23A).

15. Heat exchange device according to one of claims 1 to 10,

the oil return part (22) comprises an oil return hole (221) arranged on the pipe wall of the air guide pipe (21), and at least one oil return opening is the oil return hole (221); and/or

The oil return part (22) comprises an oil return hole (221) formed in the pipe wall of the air guide pipe (21) and a liquid guide pipe (222) communicated with the oil return hole (221), and at least one oil return opening is formed in the liquid guide pipe (222); and/or

The oil return part (22) comprises an oil return hole (221) formed in the pipe wall of the air guide pipe (21) and a filter element (223) communicated with the oil return hole (221), and at least one oil return opening is formed in the filter element (223); and/or

The oil return part (22) comprises an oil return hole (221) formed in the pipe wall of the air guide pipe (21), a filter element (223) communicated with the oil return hole (221) and a liquid guide pipe (222) connected with the oil return hole (221) and the filter element (223), and at least one oil return opening is formed in the filter element (223).

16. Heat exchange device according to claim 15, characterised in that the liquid duct (222) is a capillary tube.

17. A heat exchange apparatus according to any one of claims 1 to 10, characterised in that the oil return portion (22) includes a plurality of the oil return ports, at least two of which differ in height.

18. Heat exchange device according to any one of claims 1 to 10, characterised in that the gas-guide tubes (21) are U-tubes.

19. The heat exchange apparatus as set forth in claim 18 wherein the U-shaped tube is bent from a single tube or welded from a plurality of straight tube sections.

20. Heat exchange device according to any one of claims 1 to 10, wherein the gas duct (21) has a balancing hole (21C) provided in the duct wall, the balancing hole (21C) being located between the first gas duct inlet/outlet port (21A) and the gas inlet/outlet port (1C) in the axial direction of the housing (11).

21. Heat exchange device according to one of claims 1 to 10,

the gas guide pipe (21) is positioned at the radial inner side of the inner barrel (12); or

One part of the air duct (21) is positioned at the radial inner side of the inner barrel (12), and the other part is positioned at the radial outer side of the inner barrel (12).

22. Heat exchange device according to any one of claims 1 to 10, wherein the falling film heat exchanger of the can type (1) further comprises a gas-liquid separation device (16), the gas-liquid separation device (16) being configured to separate liquid droplets in the gas entering the gas duct (21) through the first gas duct inlet/outlet (21A).

23. A heat exchange apparatus according to claim 22, characterised in that the gas-liquid separation device (16) is provided at the second end of the inner drum (12) to separate liquid droplets in the gas entering the inner drum (12), and the first gas duct inlet/outlet (21A) is located between the gas-liquid separation device (16) and the first end of the inner drum (12).

24. Refrigeration circuit comprising a heat exchange device, characterized in that it is a heat exchange device according to any one of claims 1 to 23.

25. Air conditioning apparatus comprising a heat exchange apparatus, characterized in that it is a heat exchange apparatus according to any one of claims 1 to 23.

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