Heat exchange device, refrigeration circuit and air conditioning device

Abstract

The present disclosure provides a heat exchange device, a refrigeration circuit and an air conditioning device. The heat exchange device comprises: a tank falling film heat exchanger comprising a shell, an inner cylinder and a heat exchange coil, the first end of the shell in the axial direction has a liquid inlet and a gas inlet and outlet port, the heat exchange coil comprises a falling film zone heat exchange section and a full liquid zone heat exchange section; and an oil return device comprising a gas guide pipe, an oil return part and a filling part, the gas guide pipe communicates with the gas inlet and outlet port of the shell and comprises a first gas guide pipe inlet and outlet located in the gas phase zone of the inner cylinder, the oil return part comprises one or more oil return ports, the oil return ports communicate with the hollow part of the gas guide pipe between the first gas guide pipe inlet and outlet and the gas inlet and outlet port, the filling part is arranged in the space of the second end of the shell in the axial direction, and the oil return ports and the filling part are located between the end of the full liquid zone heat exchange section close to the falling film zone heat exchange section and the inner wall surface of the second end of the shell in the axial direction of the shell.

Description

Technical Field

[0001] This disclosure relates to the fields of heat exchange and air conditioning technology, and particularly to a heat exchange device, a refrigeration circuit, and an air conditioning device. Background Technology

[0002] Tank-type falling film heat exchangers, as a new type of high-efficiency and energy-saving equipment, are gradually replacing flooded evaporators in air conditioning systems. Tank-type falling film heat exchangers have advantages such as small refrigerant charge, small hydrostatic pressure difference, high heat exchange efficiency, and convenient oil return. They are equipped with a flooded zone to maintain a certain liquid level during unit operation.

[0003] In the known related technologies, an oil return device is installed in a tank-type falling film heat exchanger. The U-shaped tube installed in the radial middle of the heat exchange coil of the tank-type falling film heat exchanger and the oil return hole at the bottom of the U-shaped tube are used to draw away the lubricating oil that is miscible with the liquid refrigerant in the full liquid area through the entrainment effect and return it to the compressor of the air conditioning equipment to achieve the purpose of oil return.

[0004] In developing this disclosure, the inventors discovered that because the U-shaped tube extends into the center of the coil section in the full-fill zone, the central area of ​​the coil cannot be effectively utilized. A large amount of liquid refrigerant accumulates at its bottom, increasing the refrigerant charge and raising the cost of the air conditioning equipment. Simultaneously, the large accumulation of liquid refrigerant in the full-fill zone dilutes the content of the miscible lubricating oil, making oil return more difficult. Summary of the Invention

[0005] The purpose of this disclosure is to provide a heat exchange device, a refrigeration circuit, and an air conditioning device, which aims to solve the problem of large refrigerant charging volume in heat exchange devices including tank-type falling film heat exchangers and oil return devices.

[0006] The first aspect of this disclosure provides a heat exchange device, comprising:

[0007] A tank-type falling film heat exchanger includes a shell, an inner cylinder, and a heat exchange coil. The shell has a liquid inlet and a gas inlet / outlet at its first axial end. The heat exchange coil is radially disposed between the shell and the inner cylinder. The heat exchange coil includes a falling film heat exchange section extending from the first end of the shell to a second axial end between the shell and the inner cylinder, and a full liquid heat exchange section extending from the falling film heat exchange section to the second end of the shell.

[0008] The oil return device includes a gas guide pipe, an oil return section, and a filling section. The gas guide pipe is connected to the gas inlet and outlet ports of the outer shell and includes a first gas guide pipe inlet and outlet located in the gas phase zone of the inner cylinder. The oil return section includes one or more oil return ports, which are connected to the hollow portion of the gas guide pipe located between the first gas guide pipe inlet and outlet ports and the gas inlet and outlet ports. The filling section is disposed in the space at the second end of the outer shell, and the oil return ports and the filling section are located along the axial direction of the outer shell between one end of the full liquid zone heat exchange section near the falling film zone heat exchange section and the inner wall surface of the second end of the outer shell.

[0009] In some embodiments of the heat exchange device, the filling portion includes a first filling body located in the radial center of the full liquid heat exchange section and / or a second filling body located between the inner wall surface of the full liquid heat exchange section and the second end of the outer shell.

[0010] In some embodiments of the heat exchange device,

[0011] Along the radial direction of the housing, at least a portion of the second filler is larger in size than the first filler and protrudes radially outward relative to the first filler from the housing; and / or

[0012] Along the radial direction of the housing, the side of the second filler is spaced apart from the inner wall surface of the housing, and the oil return port is located on the side of the second filler away from the second end of the housing along the axial direction of the housing.

[0013] In some embodiments of the heat exchange device, the first filler and the second filler are integrally disposed.

[0014] In some embodiments of the heat exchange device,

[0015] The first filler includes a first rotating body in the same axial direction as the outer shell; and / or

[0016] The second filler includes a second rotating body that is in the same axial direction as the outer shell.

[0017] In some embodiments of the heat exchange device,

[0018] The first rotating body and the second rotating body are coaxially arranged; and / or

[0019] At least one of the first rotating body and the second rotating body is coaxially arranged with the outer casing.

[0020] In some embodiments of the heat exchange device, the falling film heat exchange section and the full liquid heat exchange section of the heat exchange coil each include at least one coil section, the total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h, and the filling part includes the first filling body, the height of the first filling body is h5, wherein h5 ranges from h / 4 to h / 2.

[0021] In some embodiments of the heat exchange device, the falling film heat exchange section and the full liquid heat exchange section of the heat exchange coil each include at least one coil section, the total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h, the filling part includes the first filling body, and along the axial direction of the outer shell, the distance between the inlet and outlet of the first air guide pipe and the end of the first filling body away from the second end of the outer shell is h6, wherein h6>h / 6.

[0022] In some embodiments of the heat exchange device, the filling portion includes a second filler body, and the distance between the second filler body and the inner wall of the housing along the radial direction of the housing is h7, wherein h7 ranges from 5 mm to 40 mm.

[0023] In some embodiments of the heat exchange device, the filling portion includes the second filling body, and the second end of the housing has a liquid outlet, which is opposite to the radially outer side of the second filling body.

[0024] In some embodiments of the heat exchange apparatus, the filling section includes a accommodating space configured to communicate with a space at a second end of the housing outside the filling section to introduce liquid from the space at the second end of the housing into the accommodating space, and at least one of the oil return ports is located within the accommodating space.

[0025] In some embodiments of the heat exchange device, the accommodating space is located in the middle of the filling portion along the radial direction of the housing, and the filling portion further includes a connecting portion that connects the accommodating space with a space at a second end of the housing located outside the filling portion to introduce liquid from the space at the second end of the housing into the accommodating space.

[0026] In some embodiments of the heat exchange device, the communication portion includes one or more through holes extending radially along the housing, disposed at the bottom of the accommodating space.

[0027] In some embodiments of the heat exchange device,

[0028] The air guide tube is located outside the filling part; or

[0029] A portion of the air duct is located within the accommodating space.

[0030] In some embodiments of the heat exchange device,

[0031] The oil return section includes an oil return hole disposed on the wall of the air guide pipe, and at least one of the oil return ports is the oil return hole; and / or

[0032] The oil return section includes an oil return hole disposed on the wall of the air guide pipe and a liquid guide pipe communicating with the oil return hole, and at least one oil return port is located on the liquid guide pipe; and / or

[0033] The oil return section includes an oil return hole disposed on the wall of the air guide pipe and a filter element communicating with the oil return hole, and at least one oil return port is located on the filter element; and / or

[0034] The oil return section includes an oil return hole disposed on the wall of the air guide pipe, a filter element communicating with the oil return hole, and a liquid guide pipe connecting the oil return hole and the filter element, wherein at least one of the oil return ports is located on the filter element.

[0035] In some embodiments of the heat exchange device, the liquid guide tube is a capillary tube.

[0036] In some embodiments of the heat exchange device, the oil return section includes a plurality of oil return ports, at least two of which have different heights.

[0037] In some embodiments of the heat exchange device, the air duct is a U-shaped tube.

[0038] In some embodiments of the heat exchange equipment, the U-tube is formed by bending a single tube or by welding multiple straight tube segments.

[0039] In some embodiments of the heat exchange device, the air duct has a balance hole disposed on the duct wall, and the balance hole is located between the inlet and outlet of the first air duct and the gas inlet / outlet port along the axial direction of the housing.

[0040] In some embodiments of the heat exchange device,

[0041] The air guide tube is located radially inside the inner cylinder; or

[0042] A portion of the air guide tube is located radially inside the inner cylinder, and another portion is located radially outside the inner cylinder.

[0043] In some embodiments of the heat exchange device, the tank-type falling film heat exchanger further includes a gas-liquid separation device configured to separate liquid droplets in the gas entering the gas duct through the inlet and outlet of the first gas duct.

[0044] In some embodiments of the heat exchange device, the gas-liquid separation device is disposed at the second end of the inner cylinder to separate liquid droplets in the gas entering the inner cylinder, and the inlet and outlet of the first gas guide pipe are located between the gas-liquid separation device and the first end of the inner cylinder.

[0045] A second aspect of this disclosure provides a refrigeration circuit that includes the heat exchange device of the first aspect of this disclosure.

[0046] A third aspect of this disclosure provides an air conditioning device, including the heat exchange device of the first aspect of this disclosure.

[0047] Based on the heat exchange device provided in this disclosure, since the filling part is arranged axially along the shell within the space at the second end of the shell and located between the end of the heat exchange section near the falling film zone in the full liquid zone and the inner wall surface of the second end of the shell, that is, a filling part is provided within the full liquid zone. This filling part can partially occupy the space of the full liquid zone, replacing the volume of liquid refrigerant that needs to be filled in the full liquid zone, which helps reduce the amount of refrigerant charged, thereby reducing the cost of the air conditioning equipment. Simultaneously, since the total amount of liquid refrigerant in the full liquid zone is reduced, the content of lubricating oil miscible with the liquid refrigerant is relatively increased, thus increasing the lubricating oil content in the liquid drawn from the oil return port, which helps improve the oil return effect.

[0048] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0049] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0050] Figure 1 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure.

[0051] Figure 2 and Figure 3 for Figure 1 A cross-sectional view of the embodiment shown.

[0052] Figure 4 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure.

[0053] Figure 5 for Figure 4 A cross-sectional view of the embodiment shown.

[0054] Figure 6 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure.

[0055] Figure 7 for Figure 6 A cross-sectional view of the embodiment shown.

[0056] Figure 8 This is a cross-sectional structural diagram of an embodiment of the present disclosure.

[0057] Figure 9 This is a schematic diagram of the structure of the U-shaped tube in some alternative embodiments of this disclosure. Detailed Implementation

[0058] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0059] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0060] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0061] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] like Figures 1 to 9 As shown, this disclosure provides a heat exchange device. The heat exchange device includes a tank-type falling film heat exchanger 1 and an oil return device 2.

[0063] The tank-type falling film heat exchanger 1 includes a shell 11, an inner cylinder 12, and a heat exchange coil 13. The first end of the shell 11 has a liquid inlet 1A and a gas inlet / outlet port 1C. The heat exchange coil 13 is radially disposed between the shell 11 and the inner cylinder 12. The heat exchange coil 13 includes a falling film heat exchange section arranged from the first end of the shell 11 to the second end between the shell 11 and the inner cylinder 12, and a full liquid heat exchange section arranged from the falling film heat exchange section to the second end of the shell 11.

[0064] The oil return device 2 includes a gas guide pipe 21, an oil return section 22, and a filling section 23. The gas guide pipe 21 is connected to the gas inlet / outlet port 1C of the outer casing 11 and includes a first gas guide pipe inlet / outlet 21A located in the gas phase zone of the inner cylinder 12. The oil return section 22 includes one or more oil return ports, which are connected to the hollow portion of the gas guide pipe 21 located between the first gas guide pipe inlet / outlet 21A and the gas inlet / outlet port 1C. The filling section 23 is disposed in the space at the second end of the outer casing 11, and the oil return port and the filling section 23 are located along the axial direction of the outer casing 11 between one end of the heat exchange section near the falling film heat exchange section in the full liquid zone and the inner wall surface of the second end of the outer casing 11.

[0065] Since the filling part 23 is arranged axially along the outer casing 11 within the space at the second end of the outer casing 11 and located between the end of the heat exchange section near the falling film heat exchange section in the full liquid zone and the inner wall surface of the second end of the outer casing 11, the filling part 23 is provided within the full liquid zone. It can partially occupy the space of the full liquid zone, replacing the volume of liquid refrigerant that needs to be filled in the full liquid zone, which helps to reduce the amount of refrigerant charged, thereby reducing the cost of the air conditioning equipment. At the same time, since the total amount of liquid refrigerant in the full liquid zone is reduced, the content of lubricating oil that is miscible with the liquid refrigerant is relatively increased, thereby increasing the lubricating content in the liquid drawn from the oil return port, which helps to improve the oil return effect.

[0066] After the tank-type falling film heat exchanger 1 is installed, the axial direction of the outer shell 11 is vertical, the first end of the axial direction of the outer shell 11 is above the second end of the axial direction, and the gas phase zone is above the liquid-filled zone. For example... Figures 1 to 8 As shown, the inlet and outlet of the first gas guide pipe 21A is located inside the inner cylinder 12 and along the axial direction of the outer shell 11 between the gas inlet and outlet port 1C and the heat exchange section of the full liquid zone, so that the inlet and outlet of the first gas guide pipe 21A is located in the gas phase zone of the inner cylinder 12.

[0067] like Figures 1 to 8As shown, in some embodiments of the heat exchange device, the filling part 23 includes a first filling body 231 located in the radial center of the heat exchange section of the full liquid zone and / or a second filling body 232 located between the inner wall surface of the heat exchange section of the full liquid zone and the second end of the outer casing 11.

[0068] By setting a first filler 231 in the radial middle of the heat exchange section of the full liquid zone or setting a second filler 232 between the inner wall surface of the heat exchange section of the full liquid zone and the second end of the outer shell 11, the filler 23 can occupy the corresponding space in the radial middle of the heat exchange section of the full liquid zone or between the inner wall surface of the heat exchange section of the full liquid zone and the second end of the outer shell 11. This allows the corresponding part of the filler 23 to replace the corresponding space, reducing the amount of liquid refrigerant that should have been filled into the corresponding space. This helps to reduce the space that needs to be filled with liquid refrigerant in the full liquid zone, and helps to reduce the amount of refrigerant charged and improve the oil return effect.

[0069] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, along the radial direction of the housing 11, at least a portion of the second filler 232 is larger than the first filler 231 and protrudes radially outward relative to the first filler 231 from the housing 11; and / or along the radial direction of the housing 11, the side of the second filler 232 is spaced apart from the inner wall surface of the housing 11; and / or the oil return port is located along the axial direction of the housing 11 on the side of the second filler 232 away from the second end of the housing 11.

[0070] The second filler 232 is made to have a size larger than that of the first filler 231 along the radial direction of the outer casing 11 and to protrude radially outward relative to the first filler 231. This allows the second filler 232 to occupy more space in the liquid-filled area, which helps to reduce the amount of refrigerant charged and improve the oil return effect.

[0071] The second filler 232 is arranged radially with the side of the outer shell 11 and the inner wall of the outer shell 11 spaced apart. This allows the liquid refrigerant to be located within the space between the side of the second filler 232 and the inner wall of the outer shell 11. The liquid refrigerant located within this space is less disturbed and has a lower gas content than other parts of the full liquid area. When discharging the liquid refrigerant, the refrigerant can be drawn out from this space to reduce the amount of gas carried by the refrigerant.

[0072] The oil return port is located on the side of the second filler 232 away from the second end of the housing 11 along the axial direction of the housing 11, which helps to reduce the disturbance to the liquid refrigerant on the outer side of the second filler 232 when the fluid enters and exits the air guide pipe 21 through the oil return port.

[0073] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, the first filler 231 and the second filler 232 are integrally disposed.

[0074] Making the first filler 231 and the second filler 232 integrally formed facilitates the manufacturing and molding of the filler part 23, and also facilitates the faster positioning and assembly of the filler part 23 and the outer shell 11.

[0075] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, the first filler 231 includes a first rotating body in the same axial direction as the housing 11; and / or the second filler 232 includes a second rotating body in the same axial direction as the housing 11.

[0076] The first filler 231 includes a first rotating body in the same axial direction as the outer shell 11, or the second filler 232 includes a second rotating body in the same axial direction as the outer shell 11. This makes the distance between the first filler 231 or the second filler 232 and the coil section of the heat exchange section in the full liquid zone more uniform, so that there is sufficient refrigerant flowing around the coil section of the heat exchange section in the full liquid zone to participate in the heat exchange between the heat exchange sections in the full liquid zone, and reduces the impact of setting the filler part 23 on the heat exchange section in the full liquid zone.

[0077] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, the first rotating body and the second rotating body are coaxially arranged; and / or at least one of the first rotating body and the second rotating body is coaxially arranged with the housing 11.

[0078] Setting the first rotating body to be coaxial with the second rotating body, or setting at least one of the first rotating body and the second rotating body to be coaxial with the outer shell 11, is beneficial to maintaining an appropriate distance along the radial direction of the outer shell 11 between the first rotating body and the coil section of the full-heat zone heat exchange section or between the second rotating body and the inner wall surface of the outer shell 11, thereby reducing the heat exchange impact of the first rotating body and the second rotating body on the coil section of the full-heat zone heat exchange section.

[0079] like Figures 1 to 8 As shown, in some embodiments of the heat exchange equipment, the falling film heat exchange section and the flooded liquid heat exchange section of the heat exchange coil 13 each include at least one coil section. For example... Figure 3 As shown, the total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h. The filling part 23 includes a first filling body 231, the height of which is h5, and the range of h5 is h / 4 to h / 2.

[0080] Setting an appropriate height for the first filler 231 is beneficial to occupy a large portion of the liquid-filled zone space to reduce the amount of refrigerant filled, while reserving a sufficient amount of refrigerant in the liquid-filled zone to ensure that each part of the heat exchange section in the liquid-filled zone comes into contact with the liquid refrigerant for sufficient heat exchange.

[0081] like Figures 1 to 8 As shown, in some embodiments of the heat exchange equipment, the falling film heat exchange section and the flooded liquid heat exchange section of the heat exchange coil 13 each include at least one coil section. For example... Figure 3As shown, the total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h. The filling part 23 includes a first filling body 231. Along the axial direction of the outer shell 11, the distance between the inlet / outlet 21A of the first air guide pipe and the end of the first filling body 231 away from the second end of the outer shell 11 is h6, where h6>h / 6.

[0082] By reasonably setting the distance between the inlet / outlet 21A of the first air guide tube and the top of the second end of the first filler 231 that is far away from the outer shell 11, it is beneficial to ensure that the gas drawn in by the inlet / outlet 21A of the first air guide tube carries fewer droplets.

[0083] In some embodiments of the heat exchange device, the filling part 23 includes a second filling body 232, which is located radially from the outer casing 11. The distance between the second filling body 232 and the inner wall of the outer casing 11 is h7, wherein h7 ranges from 5 mm to 40 mm.

[0084] By rationally setting the distance between the second filler 232 along the radial direction of the outer shell 11 and the inner wall of the outer shell 11, a stable liquid refrigerant region can be formed at the bottom of the heat exchange section in the full liquid zone.

[0085] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, the filling part 23 includes a second filling body 232, and the second end of the housing 11 has a liquid outlet 1B, which is opposite to the radially outer side of the second filling body 232.

[0086] The outlet 1B is positioned so that the radially outer side of the second filler 232 is opposite to the outlet 1B, which facilitates the outlet 1B drawing out liquid refrigerant from the gap between the radially outer side of the second filler 232 and the inner wall of the outer casing 11, and helps to prevent the liquid refrigerant from carrying gas.

[0087] like Figures 1 to 8 As shown, in some embodiments of the heat exchange device, the filling section 23 includes a receiving space 23A, which is configured to communicate with the space at the second end of the outer casing 11 outside the filling section 23 to introduce liquid from the space at the second end of the outer casing 11 into the receiving space 23A, and at least one oil return port is located within the receiving space 23A.

[0088] The liquid refrigerant in the containment space 23A is more stable because it is less susceptible to disturbance. It gradually forms an oil-rich zone 1D in the containment space 23A. The oil return port draws liquid refrigerant from the oil-rich zone 1D, which can draw more lubricating oil into the vent pipe, thereby improving the oil return effect.

[0089] like Figure 4 and Figure 5As shown, in some embodiments of the heat exchange device, along the radial direction of the housing 11, the accommodating space 23A is located in the middle of the filling portion 23. The filling portion 23 also includes a connecting portion 23B, which connects the accommodating space 23A with the space at the second end of the housing 11 located outside the filling portion 23 to introduce liquid from the space at the second end of the housing 11 into the accommodating space 23A.

[0090] By setting the accommodating space 23A in the middle of the filling part 23, and then introducing the liquid from the space at the second end of the outer casing 11 into the accommodating space 23A through the connecting part 23B, it is beneficial to form a more stable oil-rich zone in the accommodating space 23A, thereby improving the oil return effect.

[0091] like Figure 4 and Figure 5 As shown, in some embodiments of the heat exchange device, the communication portion 23B includes one or more through holes that extend radially along the housing 11 and are disposed at the bottom of the accommodating space 23A.

[0092] The connecting portion 23B is configured to include one or more through holes extending radially along the outer casing 11 at the bottom of the accommodating space 23A, which facilitates timely replenishment of liquid in the accommodating space 23A and ensures the lubricating oil content carried by the gas in the vent pipe 21.

[0093] like Figures 1 to 5 and Figure 8 As shown, in some embodiments of the heat exchange device, the air duct 21 is located outside the filling section 23.

[0094] like Figure 6 and Figure 7 As shown, in some embodiments of the heat exchange apparatus, a portion of the air duct 21 is located within the accommodating space 23A.

[0095] The relative positions of the air guide pipe 21 and the filling part 23 can be flexibly set according to the structure and size of the oil return part 22 and the filling part 23, thereby improving the flexibility of the oil return device 2.

[0096] like Figures 1 to 8 As shown, in some embodiments of the heat exchange equipment, the oil return section 22 includes an oil return hole 221 disposed on the wall of the air guide pipe 21, and at least one oil return port is an oil return hole 221; and / or

[0097] The oil return section 22 includes an oil return hole 221 disposed on the wall of the air guide pipe 21 and a liquid guide pipe 222 communicating with the oil return hole 221, and at least one oil return port is located on the liquid guide pipe 222; and / or

[0098] The oil return section 22 includes an oil return hole 221 disposed on the wall of the air guide pipe 21 and a filter element 223 communicating with the oil return hole 221, with at least one oil return port located on the filter element 223; and / or

[0099] The oil return section 22 includes an oil return hole 221 disposed on the wall of the air guide pipe 21, a filter element 223 communicating with the oil return hole 221, and a liquid guide pipe 222 connecting the oil return hole 221 and the filter element 223, with at least one oil return port located on the filter element 223.

[0100] At least one oil return port is an oil return hole 221, which simplifies the structure of the oil return section. At least one oil return port is located on the liquid guide pipe 222, which helps to shorten the length of the gas guide pipe 21 and reduce the weight of the oil return device. At least one oil return port is located on the filter element 223, which helps to filter impurities in the liquid refrigerant entering the oil return port and improve the cleanliness of the refrigerant in the refrigerant circuit.

[0101] In some embodiments of the heat exchange device, the liquid guide tube 222 is a capillary tube.

[0102] The liquid guide tube 222 is a capillary tube. The capillary action of the capillary tube utilizes the liquid refrigerant to draw it from the oil return port into the gas guide tube 21.

[0103] like Figure 6 and Figure 7 As shown, in some embodiments of the heat exchange device, the oil return section 22 includes a plurality of oil return ports, at least two of which have different heights.

[0104] At least two of the multiple return ports have different heights, which facilitates oil return from different liquid levels and improves the oil return stability of the return device 2.

[0105] In some embodiments of the heat exchange device, the air duct 21 is a U-shaped tube.

[0106] The air guide pipe 21 is a U-shaped pipe, which is beneficial to use the entrainment effect of the U-shaped pipe to draw away the lubricating oil that is miscible with the liquid refrigerant in the liquid-filled area.

[0107] like Figures 1 to 8 As shown, in some embodiments of the heat exchange equipment, the U-shaped tube is formed by bending a single tube.

[0108] U-shaped tubes are made by bending a single tube, which facilitates the smooth flow of fluid inside the U-shaped tube.

[0109] like Figures 1 to 9 As shown, in some embodiments of the heat exchange equipment, the U-shaped tube is welded together from multiple straight pipe sections.

[0110] U-shaped pipes are made by welding together multiple straight pipe sections, which allows for a smaller distance between two straight pipe sections, making it easier to place the U-shaped pipe in a narrow space.

[0111] like Figures 1 to 3As shown, in some embodiments of the heat exchange device, the air duct 21 has a balance hole 21C disposed on the duct wall. Along the axial direction of the housing 11, the balance hole 21C is located between the inlet / outlet 21A of the first air duct and the gas inlet / outlet port 1C.

[0112] A balance hole 21C is provided on the air guide pipe 21 to balance the air pressure inside and outside the air guide pipe 21, which is beneficial to the return oil volume.

[0113] like Figures 1 to 7 As shown, in some embodiments of the heat exchange device, the air duct 21 is located radially inside the inner cylinder 12.

[0114] The air guide pipe 21 is set on the radial inner side of the inner cylinder 12, which is conducive to the concentric arrangement of the inner cylinder 12 and the outer shell 11, and to the approximate heat exchange environment of each part of the heat exchange coil 13 along the circumference, thereby improving the heat exchange efficiency of the tank-type falling film heat exchanger 1.

[0115] like Figure 8 As shown, in some embodiments of the heat exchange device, a portion of the air duct 21 is located radially inside the inner cylinder 12, and another portion is located radially outside the inner cylinder 12.

[0116] A portion of the air guide pipe 21 is located on the radial inner side of the inner cylinder 12, and the other portion is located on the radial outer side of the inner cylinder 12, making the arrangement of the air guide pipe more flexible. When the inner diameter of the inner cylinder 12 is small, the oil return device 2 can also be arranged.

[0117] like Figure 8 As shown, in some embodiments of the heat exchange equipment, the tank-type falling film heat exchanger 1 further includes a gas-liquid separation device 16, which is configured to separate liquid droplets in the gas entering the gas guide pipe 21 through the inlet and outlet 21A of the first gas guide pipe.

[0118] In some embodiments of the heat exchange device, a gas-liquid separation device 16 is disposed at the second end of the inner cylinder 12 to separate liquid droplets in the gas entering the inner cylinder 12, and the inlet and outlet 21A of the first gas guide pipe is located between the gas-liquid separation device 16 and the first end of the inner cylinder 12.

[0119] The gas-liquid separation device 16 helps to reduce the liquid droplets carried in the gas in the gas guide pipe 21.

[0120] This disclosure also provides a refrigeration circuit. The refrigeration circuit includes the heat exchange device of this disclosure. The refrigeration circuit of this disclosure has the advantages of the heat exchange device of this disclosure.

[0121] This disclosure also provides an air conditioning device, which includes the heat exchange device of this disclosure.

[0122] The refrigeration circuit of this disclosure has the advantages of the heat exchange device of this disclosure.

[0123] The following combination Figures 1 to 9 The embodiments of this disclosure will be described in more detail below. Figures 1 to 9 In the illustrated embodiment, the orientation of each heat exchange device is the same as its installed orientation, wherein the axis of the housing 11 is vertically aligned, and the first end of the housing 11 is aligned with... Figures 1 to 9 Corresponding to the upper end of the middle, the second end of the housing 11 is with Figures 1 to 9 The lower end corresponds to this. In the following description, the description of direction or orientation may be in addition to the orientation of the housing 11, or it may be in the direction of the housing 11. Figures 1 to 9 The direction or orientation shown in the image can be described as follows: for example, the first end of the shell 11 or inner cylinder 12 can also be described as the upper end or top end of the shell 11 or inner cylinder 12, and the second end of the shell 11 or inner cylinder 12 can also be described as the lower end or bottom end, etc.

[0124] Figure 1 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure. Figure 2 and Figure 3 for Figure 1 A cross-sectional structural schematic diagram of the illustrated embodiment. (See diagram below.) Figures 1-3 As shown, some embodiments of this disclosure provide a heat exchange device, which includes a tank-type falling film heat exchanger 1 and an oil return device 2.

[0125] The tank-type falling film heat exchanger 1 includes an outer shell 11, an inner cylinder 12, a heat exchange coil 13, a liquid distributor 14, and a liquid equalization plate 15.

[0126] The outer casing 11 includes an outer cylinder 111, a first cover 112 covering the first end of the outer cylinder 111, and a second cover 113 covering the second end of the cylinder 111. The outer casing 11 has a liquid inlet 1A, a liquid outlet 1B, and a gas inlet / outlet 1C. Both the liquid inlet 1A and the gas inlet / outlet 1C are located at the first end of the outer casing 11. Figures 1 to 3 As shown, both the liquid inlet 1A and the gas inlet / outlet 1C are located on the first cover 112. The liquid outlet 1B is located at the second end of the outer casing 11. Figures 1 to 3 As shown, the liquid outlet 1B is located on the side wall of the second end of the outer cylinder 111.

[0127] like Figures 1 to 3 As shown, the first end of the inner cylinder 12 is fixed to the first end of the outer shell 11, and the second end of the inner cylinder 12 is spaced apart from the second end of the outer shell 11. The upper end of the inner cylinder 12 is fixedly connected to the inner wall of the first cover 112 of the outer shell 11. Along the radial direction of the outer shell 11, the liquid inlet 1A is located between the outer cylinder 111 and the inner cylinder 12. Along the radial direction of the outer shell 11, the gas inlet / outlet port 1C is located inside the inner cylinder 12. The lower end of the inner cylinder 12 is a certain distance from the inner wall of the second cover 113 of the outer shell 11. The inner cylinder 12 and the outer shell 11 are coaxially arranged.

[0128] The heat exchange coil 13 is disposed radially between the outer shell 11 and the inner cylinder 12. The heat exchange coil 13 includes a falling film heat exchange section arranged from the first end to the second end of the outer shell 11 between the outer shell 11 and the inner cylinder 12, and a full liquid heat exchange section arranged from the falling film heat exchange section to the second end of the outer shell 11.

[0129] The falling film heat exchange section and the flooded liquid heat exchange section of the heat exchange coil 13 each include at least one coil section. Along the radial direction of the shell 11, each coil section can be single-layered or multi-layered. The coil length, number of turns, and number of inner and outer layers of different heat exchange sections may be the same or different. Similarly, the coil length, number of turns, and number of inner and outer layers of different coil sections within the same heat exchange section may also be the same or different.

[0130] like Figures 1 to 3 As shown, in some embodiments of this disclosure, the falling film 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, the second coil section 132, and their surrounding space constitute the falling film zone. The full liquid heat exchange section is located below the falling film 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 the area below it constitute the full liquid zone. In this embodiment, the bottom end of the inner cylinder 12 is suspended above the third coil section 133 and communicates with the falling film zone.

[0131] The liquid distributor 14 can uniformly distribute liquid refrigerant on the falling film heat exchange section. The liquid distributor 14 includes two inner and outer flat cylinders, 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. The liquid distributor 14 is coaxially arranged with the outer cylinder 111 and mounted on the first cover 112. The upper annular plate has an opening opposite the liquid inlet 1A, allowing the annular space inside the liquid distributor 14 to communicate with the liquid inlet 1A, thereby receiving liquid entering the outer casing 11 from the liquid inlet 1A. Multiple first perforations 14A are evenly distributed on the lower annular plate. After being uniformly distributed by the lower annular plate, the liquid in the annular space of the liquid distributor 14 flows downwards evenly through the multiple first perforations 14A to the falling film zone, landing on the falling film heat exchange section and undergoing film heat exchange with it. In some alternative embodiments, more layers of annular plates with multiple first perforations can be arranged at intervals from the upper and lower annular plates.

[0132] Along the axial direction of the housing 11, the liquid distribution plate 15 is disposed between the first coil section 131 and the second coil section 132. The liquid distribution plate 15 has a plurality of second perforations 15A. The liquid distribution plate 15 can evenly distribute the liquid refrigerant flowing through the first coil section 131 onto the second coil section 132, thereby improving the heat exchange efficiency between the second coil section 132 and the liquid refrigerant.

[0133] like Figures 1 to 3 As shown, the oil return device 2 includes an air guide pipe 21, an oil return section 22, and a filling section 23.

[0134] The gas guide pipe 21 is connected to the gas inlet / outlet port 1C of the outer shell 11 and includes a first gas guide pipe inlet / outlet 21A. The first gas guide pipe inlet / outlet 21A is located inside the inner cylinder 12 and along the axial direction of the outer shell 11 between the gas inlet / outlet port 1C and the heat exchange section of the full liquid zone. The gas guide pipe 21 is a U-shaped pipe. The U-shaped pipe is formed by bending a single tube. The two straight pipe sections of the gas guide pipe 21 have different lengths. The first gas guide pipe inlet / outlet 21A is the port of the shorter straight pipe section of the U-shaped pipe. The port of the longer straight pipe section of the gas guide pipe 21 is the second gas guide pipe inlet / outlet 21B. The longer straight pipe section of the gas guide pipe extends out from the gas inlet / outlet port 1C, so that the gas entering the first gas guide pipe inlet / outlet 21A can flow through the gas inlet / outlet port 1C and then exit the outer shell 11 from the second gas guide pipe inlet / outlet 21B.

[0135] like Figures 1 to 3 As shown, the gas guide tube 21 has a balance hole 21C provided on the tube wall. Along the axial direction of the outer shell 11, the balance hole 21C is located between the inlet / outlet 21A of the first gas guide tube and the gas inlet / outlet port 1C.

[0136] The oil return section 22 includes an oil return port, which communicates with the hollow portion of the gas guide pipe 21 located between the inlet / outlet 21A of the first gas guide pipe and the gas inlet / outlet port 1C. The oil return port is located along the axial direction of the outer shell 11 between one end of the heat exchange section near the falling film heat exchange section in the full liquid zone and the inner wall surface of the second end of the outer shell 11. Specifically, the oil return port communicates with the hollow portion at the lowest end of the bend of the U-shaped tube. The U-shaped tube is located inside the inner cylinder 12 along the radial direction of the outer shell 11.

[0137] like Figures 1 to 3 As shown, the oil return section 22 includes an oil return hole 221 disposed on the wall of the air guide pipe 21, a filter element 223 communicating with the oil return hole 221, and a liquid guide pipe 222 connecting the oil return hole 221 and the filter element 223. At least one oil return port is located on the filter element 223. The liquid guide pipe 222 is a capillary tube. In this embodiment, the filter element 223 is specifically a filter nozzle, including an upper mounting part and a lower filter screen. The upper end of the mounting part is connected to the bottom end of the liquid guide pipe 222. The lower end of the mounting part is connected to the filter screen. The oil return port includes multiple mesh openings of the filter screen.

[0138] The filling part 23 is disposed in the space at the second end of the outer shell 11 and is located between one end of the heat exchange section near the falling film heat exchange section of the full liquid heat exchange section and the inner wall surface of the second end of the outer shell 11. That is, the filling part 23 is disposed in the bottom space of the outer shell 11 and is located between the outer edge of the upper end of the heat exchange section of the full liquid heat exchange section and the inner wall surface of the bottom of the outer shell 11.

[0139] The filling part 23 can be made of materials such as nylon or plastic.

[0140] like Figures 1 to 3 As shown, the filling section 23 includes a first filling body 231 located in the radial center of the heat exchange section in the full liquid zone and a second filling body 232 located between the inner wall surface of the heat exchange section in the full liquid zone and the second end of the outer casing 11. The first filling body 231 and the second filling body 232 are integrally disposed.

[0141] like Figures 1 to 3 As shown, along the radial direction of the outer casing 11, the second filler 232 is larger than the first filler 231 and protrudes radially outward relative to the first filler 231 from the outer casing 11. Along the radial direction of the outer casing 11, the side of the second filler 232 is spaced apart from the inner wall surface of the outer casing 11, and the oil return port is located along the axial direction of the outer casing 11 on the side of the second filler 232 away from the second end of the outer casing 11, i.e., on the upper side of the second filler 232. Figures 1 to 3 As shown, the filling part 23 includes a second filling body 232, and the second end of the outer shell 11 has a liquid outlet 1B, which is opposite to the radially outer side of the second filling body 232.

[0142] like Figures 1 to 3 As shown, in some embodiments of the heat exchange device, the first filler 231 includes a first rotating body in the same axial direction as the housing 11, and the second filler 232 includes a second rotating body in the same axial direction as the housing 11. Figures 1 to 3 In the diagram, both the first and second rotating bodies are cylinders. In embodiments not shown, the first and second rotating bodies can be other shapes. For example, they can be rotating bodies whose generatrices are straight lines or broken lines inclined to their own axes, rotating bodies whose generatrices are curves concave or convex toward their own axes, or rotating bodies whose generatrices are a combination of straight lines and curves, etc.

[0143] like Figures 1 to 3 As shown, the first rotating body, the second rotating body, and the outer casing 11 are arranged coaxially.

[0144] like Figure 3 As shown, the total height of the multiple coil sections in the falling film heat exchange section and the full liquid heat exchange section is h. Among them, the height of the first coil section 131 is h1, the height of the second coil section 132 is h2, and the height of the third coil section 133 is h3. The total height h is the sum of h1, h2, and h3. Figure 3In this context, h4 represents the radius of the internal space of the outer casing 11. The filling section 23 includes a first filling body 231 with a height of h5, where h5 ranges from h / 4 to h / 2. For example, h5 = h / 3. h5 falling within this range facilitates matching the liquid level height in the full liquid zone. The liquid level height in the full liquid zone is related to the ratio of the heat exchange area of ​​the heat exchange section in the full liquid zone to the total heat exchange area of ​​the heat exchange coil; this ratio is generally 25% to 50%. Along the axial direction of the outer casing 11, the distance between the inlet / outlet 21A of the first air guide pipe and the end of the first filling body 231 furthest from the outer casing 11 is h6, where h6 > h / 6. For example, h6 = h / 4. Properly setting the range of h6 can prevent larger droplets from splashing into the inlet / outlet 21A of the first air guide pipe, preventing air intake and liquid carryover. Along the radial direction of the outer casing 11, the distance between the second filling body 232 and the inner wall of the outer casing 11 is h7, where h7 ranges from 5 mm to 40 mm. For example, h7 can be 25mm. Properly setting the size of h7 facilitates the formation of a stable liquid refrigerant within the gap between the second filler 232 and the outer casing 11, while preventing debris from clogging the outlet 1B.

[0145] like Figures 1 to 3 As shown, the filling part 23 includes a receiving space 23A, which is configured to communicate with the space at the second end of the outer casing 11 outside the filling part 23 to introduce liquid into the receiving space 23A from the space at the second end of the outer casing 11, and at least one oil return port is located in the receiving space 23A. Figures 1 to 3 In the illustrated embodiment, the accommodating space 23A is a mounting groove arranged radially along the first rotating body. The depth of the mounting groove is greater than the radius of the first rotating body. The filter tip and the liquid guide tube 232 are located approximately at the radial center of the first rotating body.

[0146] like Figures 1 to 3 As shown, in some embodiments of the heat exchange device, the air duct 21 is located outside the filling section 23.

[0147] In this embodiment, a mounting groove is opened on the side of the first rotating body of the filling part 23, which serves as the first filling body 231, to form a accommodating space 23A. The solid part of the filling part 23 fills part of the liquid-filled area, reducing the amount of refrigerant charged into the refrigeration circuit and air conditioning equipment where the heat exchange device is located, and creating an oil-rich area 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 drawn in by the entrainment pressure difference of the U-shaped tube, achieving the purpose of oil return.

[0148] The mounting slots provided on the filling section 23 are not limited to Figures 1 to 3 The straight shape shown allows both the capillary tube and the filter tip to fit into the mounting slot. The capillary tube does not necessarily need to be... Figures 1 to 3 As shown, it can be placed vertically downwards, or tilted.

[0149] The heat exchange device of this disclosure can be applied to a refrigeration circuit or an air conditioning system. The refrigeration circuit or air conditioning system may include a compressor, a first heat exchanger, a throttling device, and a second heat exchanger connected sequentially via refrigerant piping. If the refrigeration circuit or air conditioning system can both cool and heat, it may also include a four-way valve for switching the refrigerant flow direction. The heat exchange device of this embodiment can serve as either the first or second heat exchanger in the refrigeration circuit or the air conditioning system.

[0150] When the heat exchanger is used as an evaporator, the third coil section 133 is surrounded by liquid refrigerant. The filling section 23 reduces the volume of liquid refrigerant in the filled zone and decreases its agitation. This causes lubricating oil (slightly denser than the refrigerant and partially miscible with it) to deposit at the bottom, forming an oil-rich zone 1D. A capillary tube connected to the U-tube and its filter tip extend into the mounting groove of the filling section. The liquid refrigerant mixed with lubricating oil passes through the filter tip to remove fine impurities before entering the capillary tube. The liquid refrigerant entering the outer casing 11 is heated and evaporated into gaseous refrigerant by the heat exchange coil 13. The gaseous refrigerant enters from the first gas inlet / outlet 21A of the U-tube and flows out of the heat exchanger from the second gas inlet / outlet 21B of the U-tube through the gas inlet / outlet port 1C. The gas entering the U-tube forms a high-speed gas flow field inside the U-tube. The high-speed gaseous refrigerant flowing inside the U-tube draws in the liquid refrigerant mixed with lubricating oil through the oil return hole 221 on it and carries it out of the heat exchange equipment back to the compressor.

[0151] When the heat exchanger is used as a condenser, gas enters the U-shaped tube from the second gas inlet / outlet 21B and flows out from the first gas inlet / outlet 21A into the inner cylinder 12, thereby filling the entire internal space of the outer shell 11 and condensing on the surface of the heat exchange coil 13. At this time, a liquid seal is formed between the second filler 232 of the filling part 23 and the outer cylinder 112, preventing the gas from flowing out from the liquid outlet 1B without condensation.

[0152] Figure 4 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure. Figure 5 for Figure 4 A cross-sectional structural schematic diagram of the illustrated embodiment. (See diagram below.) Figure 4 and Figure 5 The heat exchange devices shown in some embodiments are... Figures 1 to 3 The difference in the illustrated embodiment is that:

[0153] No balancing holes are provided on the vent pipe 21. Along the radial direction of the outer casing 11, the accommodating space 23A is located in the middle of the filling section 23. The filling section 23 also includes a connecting section 23B, which connects the accommodating space 23A with the space at the second end of the outer casing 11 located outside the filling section 23, to introduce liquid from the space at the second end of the outer casing 11 into the accommodating space 23A. The connecting section 23B includes two through holes extending radially along the outer casing 11 and located at the bottom of the accommodating space 23A.

[0154] Figures 4 to 5 For any parts not described in the corresponding embodiments, please refer to Figures 1 to 3 The relevant description of the corresponding embodiments.

[0155] Figure 6 This is a three-dimensional cross-sectional structural diagram of an embodiment of the present disclosure. Figure 7 for Figure 6 A cross-sectional structural schematic diagram of the illustrated embodiment. (See diagram below.) Figure 6 and Figure 7 The heat exchange devices shown in some embodiments are... Figures 1 to 3 The difference in the illustrated embodiment is that:

[0156] No balancing hole is provided on the air guide pipe 21. A portion of the air guide pipe 21 is located within the accommodating space 23A. The oil return section 22 has three oil return ports at different heights. The oil return section 22 includes three oil return holes 221 provided on the pipe wall of the air guide pipe 21 and a filter element 223 communicating with the oil return hole 221 located at the lowest point. One 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 higher positions are the two oil return holes 221 provided on the pipe wall of the air guide pipe 21.

[0157] Figures 6 to 7 For any parts not described in the corresponding embodiments, please refer to Figures 1 to 3 The relevant description of the corresponding embodiments.

[0158] Figure 8 This is a cross-sectional structural diagram of an embodiment of the present disclosure. Figure 8 The heat exchange device of the embodiment shown is Figures 1 to 3 The difference in the illustrated embodiment is that:

[0159] The inner cylinder 12 is eccentrically positioned relative to the outer shell 11. Along the radial direction of the outer shell 11, the gas inlet / outlet port 1C is located between the outer cylinder 111 and the inner cylinder 12. A portion of the gas guide pipe 21 is located radially inside the inner cylinder 12, and another portion is located radially outside the inner cylinder 12. The straight section of the U-shaped pipe containing the first gas guide pipe inlet / outlet 21A is located radially inside the inner cylinder 12, while the other straight section is located radially outside and communicates with the gas inlet / outlet port 1C.

[0160] In addition, such as Figure 8As shown, the tank-type falling film heat exchanger 1 also includes a gas-liquid separation device 16, which is configured to separate liquid droplets in the gas entering the gas guide pipe 21 via the inlet / outlet 21A of the first gas guide pipe. The gas-liquid separation device 16 is disposed at the second end of the inner cylinder 12 to separate liquid droplets in the gas entering the inner cylinder 12, and the inlet / outlet 21A of the first gas guide pipe is located between the gas-liquid separation device 16 and the first end of the inner cylinder 12. The gas-liquid separation device 16 includes, for example, a perforated plate and / or a filter screen.

[0161] Figure 8 For any parts not described in the corresponding embodiments, please refer to Figures 1 to 3 The relevant description of the corresponding embodiments.

[0162] Figure 9 This is a schematic diagram of the structure of the U-shaped tube in some alternative embodiments of this disclosure. The U-shaped tube of the air guide tube 21 is formed by welding multiple straight pipe sections. Figure 9 The disclosed U-tube can replace the U-tube in any of the foregoing embodiments.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A heat exchange device, characterized in that, include: A tank-type falling film heat exchanger (1) includes a shell (11), an inner cylinder (12), and a heat exchange coil (13). The shell (11) has a liquid inlet (1A) and a gas inlet / outlet (1C) at its first axial end. The heat exchange coil (13) is radially disposed between the shell (11) and the inner cylinder (12). The heat exchange coil (13) includes a falling film heat exchange section extending from the first end of the shell (11) to its second axial end between the shell (11) and the inner cylinder (12), and a full liquid heat exchange section extending from the falling film heat exchange section to the second end of the shell (11). The oil return device (2) includes a gas guide pipe (21), an oil return section (22), and a filling section (23). The gas guide pipe (21) is connected to the gas inlet / outlet port (1C) of the outer shell (11) and includes a first gas guide pipe inlet / outlet (21A) located in the gas phase zone of the inner cylinder (12). The oil return section (22) includes one or more oil return ports, which are connected to the hollow portion of the gas guide pipe (21) located between the first gas guide pipe inlet / outlet (21A) and the gas inlet / outlet port (1C). The filling section (23) is disposed in the space at the second end of the outer shell (11), and the oil return port and the filling section (23) are located along the axial direction of the outer shell (11) at one end of the heat exchange section near the falling film heat exchange section of the full liquid zone and the inner wall surface of the second end of the outer shell (11). The filling portion (23) includes a receiving space (23A) configured to communicate with the space at the second end of the outer casing (11) outside the filling portion (23) to introduce liquid into the receiving space (23A) from the space at the second end of the outer casing (11). At least one of the oil return ports is located within the receiving space (23A). Along the radial direction of the outer casing (11), the receiving space (23A) is located in the middle of the filling portion (23). The filling portion (23) also includes a connecting portion (23B) connecting the receiving space (23A) with the space at the second end of the outer casing (11) outside the filling portion (23) to introduce liquid into the receiving space (23A) from the space at the second end of the outer casing (11).

2. The heat exchange device according to claim 1, characterized in that, The filling part (23) includes a first filling body (231) located in the radial center of the heat exchange section of the full liquid zone and / or a second filling body (232) located between the inner wall surface of the heat exchange section of the full liquid zone and the second end of the outer shell (11).

3. The heat exchange device according to claim 2, characterized in that, Along the radial direction of the outer casing (11), at least a portion of the second filler (232) is larger in size than the first filler (231) and protrudes radially outward relative to the first filler (231) from the outer casing (11); and / or Along the radial direction of the outer casing (11), the side surface of the second filler (232) is spaced apart from the inner wall surface of the outer casing (11); and / or The oil return port is located along the axial direction of the outer casing (11) on the side of the second filler (232) away from the second end of the outer casing (11).

4. The heat exchange device according to claim 2, characterized in that, The first filler (231) and the second filler (232) are integrally formed.

5. The heat exchange device according to claim 2, characterized in that, The first filler (231) includes a first rotating body in the same axial direction as the outer shell (11); and / or The second filler (232) includes a second rotating body in the same axial direction as the outer shell (11).

6. The heat exchange device according to claim 5, characterized in that, The first rotating body and the second rotating body are coaxially arranged; and / or At least one of the first rotating body and the second rotating body is coaxially arranged with the outer shell (11).

7. The heat exchange device according to claim 2, characterized in that, The falling film heat exchange section and the full liquid heat exchange section of the heat exchange coil (13) each include at least one coil section. The total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h. The filling part (23) includes the first filling body (231). The height of the first filling body (231) is h5, where h5 ranges from h / 4 to h / 2.

8. The heat exchange device according to claim 2, characterized in that, The falling film heat exchange section and the full liquid heat exchange section of the heat exchange coil (13) each include at least one coil section. The total height of the multiple coil sections of the falling film heat exchange section and the full liquid heat exchange section is h. The filling part (23) includes the first filling body (231). Along the axial direction of the outer shell (11), the distance between the inlet and outlet (21A) of the first air guide pipe and the end of the first filling body (231) away from the second end of the outer shell (11) is h6, where h6>h / 6.

9. The heat exchange device according to claim 2, characterized in that, The filling part (23) includes the second filling body (232), and the distance between the second filling body (232) and the inner wall of the outer shell (11) along the radial direction of the outer shell (11) is h7, wherein h7 ranges from 5mm to 40mm.

10. The heat exchange device according to claim 2, characterized in that, The filling part (23) includes the second filling body (232), and the second end of the outer shell (11) has a liquid outlet (1B), which is opposite to the radially outer side of the second filling body (232).

11. The heat exchange device according to any one of claims 1 to 10, characterized in that, The connecting portion (23B) includes one or more through holes that extend radially along the housing (11) and are disposed at the bottom of the accommodating space (23A).

12. The heat exchange device according to any one of claims 1 to 10, characterized in that, The air duct (21) is located outside the filling part (23); or A portion of the air duct (21) is located within the accommodating space (23A).

13. The heat exchange device according to any one of claims 1 to 10, characterized in that, The oil return section (22) includes an oil return hole (221) disposed on the pipe wall of the air guide pipe (21), and at least one of the oil return ports is the oil return hole (221); and / or The oil return section (22) includes an oil return hole (221) disposed on the wall of the air guide pipe (21) and a liquid guide pipe (222) communicating with the oil return hole (221), and at least one of the oil return ports is located on the liquid guide pipe (222); and / or The oil return section (22) includes an oil return hole (221) disposed on the wall of the air guide pipe (21) and a filter element (223) communicating with the oil return hole (221), at least one of the oil return ports being located on the filter element (223); and / or The oil return section (22) includes an oil return hole (221) disposed on the pipe wall of the air guide pipe (21), a filter element (223) communicating with the oil return hole (221), and a liquid guide pipe (222) connecting the oil return hole (221) and the filter element (223), and at least one of the oil return ports is located on the filter element (223).

14. The heat exchange device according to claim 13, characterized in that, The liquid guide tube (222) is a capillary tube.

15. The heat exchange device according to any one of claims 1 to 10, characterized in that, The oil return section (22) includes a plurality of oil return ports, at least two of which have different heights.

16. The heat exchange device according to any one of claims 1 to 10, characterized in that, The air duct (21) is a U-shaped tube.

17. The heat exchange device according to claim 16, characterized in that, The U-shaped tube is formed by bending a single tube or by welding multiple straight tube sections.

18. The heat exchange device according to any one of claims 1 to 10, characterized in that, The gas guide tube (21) has a balance hole (21C) provided on the tube wall. Along the axial direction of the outer shell (11), the balance hole (21C) is located between the inlet / outlet (21A) of the first gas guide tube and the gas inlet / outlet port (1C).

19. The heat exchange device according to any one of claims 1 to 10, characterized in that, The air guide pipe (21) is located radially inside the inner cylinder (12); or A portion of the air guide tube (21) is located radially inside the inner cylinder (12), and another portion is located radially outside the inner cylinder (12).

20. The heat exchange device according to any one of claims 1 to 10, characterized in that, The tank-type falling film heat exchanger (1) further includes a gas-liquid separation device (16), which is configured to separate liquid droplets in the gas entering the gas guide pipe (21) through the inlet and outlet (21A) of the first gas guide pipe.

21. The heat exchange device according to claim 20, characterized in that, The gas-liquid separator (16) is disposed at the second end of the inner cylinder (12) to separate liquid droplets in the gas entering the inner cylinder (12), and the inlet and outlet (21A) of the first gas guide pipe is located between the gas-liquid separator (16) and the first end of the inner cylinder (12).

22. A refrigeration circuit, comprising a heat exchange device, characterized in that, The heat exchange device is the heat exchange device according to any one of claims 1 to 21.

23. An air conditioning device, comprising a heat exchange device, characterized in that, The heat exchange device is the heat exchange device according to any one of claims 1 to 21.

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