CN209877157U - Radiation convection type heat exchanger and air conditioner with same - Google Patents
Radiation convection type heat exchanger and air conditioner with same Download PDFInfo
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- CN209877157U CN209877157U CN201920047809.8U CN201920047809U CN209877157U CN 209877157 U CN209877157 U CN 209877157U CN 201920047809 U CN201920047809 U CN 201920047809U CN 209877157 U CN209877157 U CN 209877157U
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Abstract
The utility model relates to a radiation convection type heat exchanger and have its air conditioner. Specifically, the radiation convection type heat exchanger includes: a radiation heat exchanging part which is in a cylindrical shape with openings at both ends, is configured to absorb heat or cold from an inner wall surface thereof, and radiates the heat or cold from an outer wall surface thereof; and a convection heat exchanging part disposed at an inner side of the radiation heat exchanging part, configured to generate heat or cold, and to transfer the heat or cold to air flowing through the inner side of the radiation heat exchanging part and to transfer the heat or cold to an inner wall surface of the radiation heat exchanging part; the heat convection part comprises a refrigerant pipeline and a plurality of radiating fins arranged on the refrigerant pipeline; each radiating fin is a flat sheet fin. On the premise of ensuring the heating or refrigerating capacity, the air blowing feeling of the human body is reduced, and the thermal comfort of the human body is improved.
Description
Technical Field
The utility model relates to a refrigeration field of heating especially relates to a radiation convection type heat exchanger and have its air conditioner.
Background
The heat exchanger of the existing air conditioner mainly heats or cools air in a forced convection heat exchange mode, and then transfers heat or cold to a room or a human body, but the heat or cold transfer in the convection heat exchange mode can reduce the heat comfort of the human body, and particularly when higher heating or refrigerating capacity is needed, high wind blown out from the inside of the heat exchanger of the air conditioner is easy to cause heat discomfort of the human body.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose of first aspect aims at overcoming at least one defect of current heat exchanger, provides a radiation convection type heat exchanger, when with human or room heat transfer, can show the hot discomfort who reduces the human body.
The utility model discloses the purpose of second aspect provides an air conditioner with above-mentioned radiation convection heat exchanger.
According to the utility model discloses a first aspect, the utility model provides a radiation convection type heat exchanger, it includes:
a radiant heat exchanging part having a cylindrical shape with both ends open, configured to absorb heat or cold from an inner wall surface thereof, and radiate the heat or cold outward from an outer wall surface thereof; and
a convection heat exchanging part disposed at an inner side of the radiation heat exchanging part, configured to generate heat or cold, and to transfer the heat or cold to air flowing through the inner side of the radiation heat exchanging part and to transfer the heat or cold to an inner wall surface of the radiation heat exchanging part; and is
The heat convection part comprises a refrigerant pipeline and a plurality of radiating fins arranged on the refrigerant pipeline;
each radiating fin is a flat sheet fin.
Optionally, each of the heat dissipation fins extends along an axial direction of the radiant heat exchanging portion.
Optionally, the refrigerant pipeline includes a plurality of heat exchange plates; each heat exchange plate has a first edge and a second edge extending in an axial direction of the radiant heat exchange portion; the first edge is arranged in the middle of the space inside the radiation heat exchange part, and the second edge is connected to the inner wall surface of the radiation heat exchange part; the heat exchange plates are sequentially arranged along the circumferential direction of the radiation heat exchange part;
and a plurality of radiating fins which are sequentially arranged in the direction that the corresponding first edge points to the second edge are arranged on the two sides of each heat exchange plate.
Optionally, each heat exchange plate is arranged to intersect with a radial direction of the radiant heat exchange portion towards the second edge of the heat exchange plate; or
Each heat exchange plate extends along the axial direction of the radiant heat exchange part and extends along the radial direction of the radiant heat exchange part.
Optionally, each of the heat dissipating fins is perpendicular to the corresponding heat exchange plate.
Optionally, each of the heat exchange plates has a plurality of first refrigerant channels therein, and each of the first refrigerant channels extends along the axial direction of the radiation heat exchange portion, and
in each heat exchange plate, the first edge points to the direction of the second edge, and a plurality of first refrigerant channels are arranged in sequence;
the ratio of the number of the first refrigerant channels to the number of the heat dissipation fins on each side of the first refrigerant channels in the direction from the first edge to the second edge is 4/5-10/1, preferably 1/1-10/1;
the cross section outline of each first refrigerant channel is a rectangle, and the long side of the rectangle is perpendicular to the corresponding heat exchange plate.
Optionally, the refrigerant pipeline includes a plurality of coaxially arranged cylindrical structures, and each cylindrical structure is coaxially arranged with the radiant heat exchange portion;
the cylindrical structure comprises at least one heat exchange cylinder, and one or more second refrigerant channels are arranged on the wall of each heat exchange cylinder; and is
A fin layer is arranged between every two adjacent cylindrical structures, and each fin layer is provided with a plurality of radiating fins which are uniformly distributed along the circumferential direction of the radiation heat exchanging part.
Optionally, a fin layer is arranged between the outermost cylindrical structure and the inner wall surface of the radiant heat exchange part; or the outer wall surface of the outermost cylindrical structure and the inner wall surface of the radiation heat exchange part are integrally formed or abut against each other in a contact mode.
Optionally, the convection heat transfer part is an integrated workpiece and is formed by adopting an extrusion process; or the like, or, alternatively,
the whole formed by the convection heat exchange part and the radiation heat exchange part is an integrated workpiece and is formed by adopting an extrusion process.
According to the utility model discloses a second aspect, the utility model also provides an air conditioner, including evaporimeter and condenser, the evaporimeter and/the condenser adopts any kind of above-mentioned radiation convection heat exchanger.
In the radiation convection type heat exchanger and the air conditioner of the utility model, because the radiation heat exchange part and the convection heat exchange part are arranged, the cylindrical radiation plate bears part of heating or refrigerating load, the blowing sense of the human body can be reduced and the thermal comfort of the human body can be increased on the premise of ensuring the heating or refrigerating capacity; especially, when heating in winter, the heat radiation and heat exchange can obviously increase the thermal comfort of the human body.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic cross-sectional view of a radiation convection heat exchanger according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a partial structure of a radiation convection heat exchanger according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a radiation convection heat exchanger according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a radiation convection heat exchanger according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic cross-sectional view of a radiation convection heat exchanger according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a radiation convection type heat exchanger, which includes a radiation heat exchanging portion 20 and a convection heat exchanging portion 30. The radiant heat exchanging portion 20 has a cylindrical shape with both ends open, and is configured to absorb heat or cold from its inner wall surface and radiate the heat or cold from its outer wall surface outward. For example, the outer contour of the cross section of the radiant heat exchanging part 20 is circular, semicircular, square or fan-shaped. The convection heat exchanging part 30 is disposed inside the radiant heat exchanging part 20, and is configured to generate heat or cold, and to transfer the heat or cold to air flowing through the inside of the radiant heat exchanging part 20 and to transfer the heat or cold to an inner wall surface of the radiant heat exchanging part 20. The radiation heat exchanging part 20 is located on the outer shell surface of the radiation convection type heat exchanger and can be directly used as an outer shell.
The embodiment of the utility model provides an in during operation, convection heat exchanger 30 produces heat or cold volume, carries out the heat exchange with the air of radiation heat exchanger portion 20 inboard to and carry out the heat exchange with the internal face of radiation heat exchanger portion 20, and the air after the heat exchange can flow out radiation heat exchanger portion 20, is used for indoor or human cold-proof or cooling, and the outer wall of radiation heat exchanger portion 20 can outwards radiate heat or cold volume, is used for indoor or human cold-proof or cooling. The cylindrical radiation plate bears a part of heating or refrigerating load, so that the blowing feeling of a human body can be reduced and the thermal comfort of the human body can be improved on the premise of ensuring the heating or refrigerating capacity; especially, when heating in winter, the heat radiation and heat exchange can obviously increase the thermal comfort of the human body.
Specifically, as shown in fig. 1 and 2, the convective heat transfer part 30 includes a refrigerant pipeline and a heat dissipation fin 33 disposed on the refrigerant pipeline. Each of the heat radiating fins 33 is preferably a flat plate-like fin. Each of the heat dissipating fins 33 is provided with one or more heat dissipating holes. Each of the heat radiating fins 33 extends in the axial direction of the radiant heat exchanging part 20.
In some preferred embodiments of the present invention, as shown in fig. 1 and fig. 2, the refrigerant pipeline includes a plurality of heat exchange plates 31, and a plurality of first refrigerant channels 32 extending along the length direction or the width direction of the heat exchange plates 31 are disposed in each of the heat exchange plates 31. A plurality of heat radiation fins 33 are attached to the plurality of heat exchange plates 31.
Further, each heat exchange plate 31 has a first edge and a second edge extending in an axial direction of the radiant heat exchanging part 20. The first edge is disposed in the middle of the space inside the radiant heat exchanging part 20, and the second edge is connected to the inner wall surface of the radiant heat exchanging part 20. The plurality of heat exchange plates 31 are uniformly distributed in the circumferential direction of the radiant heat exchanging part 20. For example, in some embodiments, each heat exchange plate 31 extends in an axial direction of the radiant heat exchanging part 20 and in a radial direction of the radiant heat exchanging part 20, as shown in fig. 1. In other embodiments, each heat exchanger plate 31 is arranged crosswise to the radial direction of the radiant heat exchanger portion 20 towards the second edge of the heat exchanger plate 31.
In some embodiments of the present invention, both sides of each heat exchange plate 31 are provided with a plurality of heat dissipation fins 33, and each heat dissipation fin 33 is perpendicular to the corresponding heat exchange plate 31, which are sequentially arranged from the direction of the corresponding first edge pointing to the second edge.
The size of the interval between two adjacent ones of the plurality of radiating fins 33 on each side of each heat exchange plate 31 has a plurality of values of distance along the radial direction of the radiant heat exchanging portion 20 so that the arrangement density of the plurality of radiating fins 33 is not equal. The plurality of distance values become smaller in order, i.e., the heat radiating fins 33 are arranged first to be sparse and then to be dense, as in the radial direction of the radiant heat exchanging portion 20. Specifically, the plurality of heat dissipating fins 33 on each side of each heat exchanging plate 31 are arranged in a plurality of groups, each group of heat dissipating fins 33 has at least two heat dissipating fins 33, the distance between every two adjacent heat dissipating fins 33 in each group of heat dissipating fins 33 is equal to the above distance value, so that the size of the interval between the heat dissipating fins 33 on each side of each heat exchanging plate 31 has a plurality of distance values, and two adjacent groups can share one heat dissipating fin 33, that is, the heat dissipating fins 33 are grouped by using a common heat dissipating fin 33.
Each of the first refrigerant passages 32 extends in the axial direction of the radiant heat exchanging part 20. In each heat exchange plate 31, the first edge points to the second edge, the plurality of first refrigerant channels 32 are sequentially arranged, and the interval between two adjacent first refrigerant channels 32 has one or more spacing values. The plurality of pitch values become smaller in turn. The plurality of first refrigerant channels 32 on each heat exchange plate 31 are arranged into a plurality of groups, each group of first refrigerant channels 32 has at least two first refrigerant channels 32, the distance between every two adjacent first refrigerant channels 32 in each group of first refrigerant channels 32 is equal to one of the above-mentioned distance values, so that the distance between the first refrigerant channels 32 on each heat exchange plate 31 has a plurality of distance values, and two adjacent groups can share one first refrigerant channel 32, that is, one shared first refrigerant channel 32 is used for grouping.
The ratio of the number of the first refrigerant channels 32 to the number of the heat dissipation fins 33 on each side of the first refrigerant channels 32 is 4/5 to 10/1, preferably 1/1 to 10/1, in the direction from the first edge to the second edge. The cross-sectional profile of each first refrigerant channel 32 is rectangular or circular or other regular or irregular shape. Preferably, the cross-sectional profile of each first refrigerant channel 32 is rectangular, and the long side of the rectangle is perpendicular to the corresponding heat exchange plate 31. The hydraulic radius of each first refrigerant channel 32 is 0.1-10 mm; the number of the first refrigerant channels 32 on each heat exchange plate 31 is 10-50. The number of heat exchange plates 31 is 4 to 50. In some embodiments of the present invention, the first edge points to the second edge, and the distance between two adjacent first refrigerant channels 32 has one, that is, the first refrigerant channels 32 are arranged at equal intervals. The distance between two adjacent ones of the plurality of heat dissipating fins 33 on each side of each heat exchange plate 31 is one, i.e., the plurality of heat dissipating fins 33 on each side of each heat exchange plate 31 are arranged at equal intervals.
In other preferred embodiments of the present invention, as shown in fig. 3 and 4, the refrigerant pipeline of the convection heat exchanging part 30 includes one or more coaxially disposed tubular structures, and each tubular structure is coaxially disposed with the radiant heat exchanging part 20. The cylindrical structure comprises at least one heat exchange cylinder 36, and one or more second refrigerant channels 37 are arranged on the wall of each heat exchange cylinder 36.
Further, the cylindrical structure may further include at least one support cylinder, and each support cylinder is disposed between two adjacent heat exchange cylinders 36, or disposed inside the innermost heat exchange cylinder 36, or disposed between the outermost heat exchange cylinder 36 and the radiant heat exchanging part 20.
In order to facilitate heat transfer between the convection heat exchanging part 30 and the radiation heat exchanging part 20, in some embodiments, a fin layer is disposed between the outermost cylindrical structure and the inner wall surface of the radiation heat exchanging part 20. In other embodiments, the outer wall surface of the outermost cylindrical structure is integrally formed with or contacts against the inner wall surface of the radiant heat exchanging portion 20. The outermost cylindrical structure is preferably a heat exchanger cartridge 36. In some embodiments of the present invention, the cylindrical structures are plural, a fin layer is also disposed between every two adjacent cylindrical structures, and each fin layer has a plurality of radiating fins 33 uniformly distributed along the circumferential direction of the radiation heat exchanging portion 20.
In some embodiments of the present invention, the fin layers are preferably at least two. In each two adjacent fin layers, the height of the heat dissipation fin 33 located on the outer side extending in the radial direction of the radiant heat exchanging portion 20 is greater than the height of the heat dissipation fin 33 located on the inner side extending in the radial direction of the radiant heat exchanging portion 20. The distance between every two adjacent radiating fins 33 in each fin layer is 0.5-10 mm. Further, the heat radiating fins 33 may be integrally formed with the respective cylindrical structures on the inner sides thereof, and the outer sides may be in contact abutment with the respective cylindrical structures on the outer sides thereof. The air flows in the air flow channels between the heat dissipating fins 33, and the total number of the heat dissipating fins 33 should satisfy the following requirements: the total outer surface of the heat dissipation fins 33 should provide a sufficient heat exchange surface for the heat exchange between the air and the refrigerant; the total number of rings of the fin layers is preferably 1-20.
In some embodiments of the present invention, each of the second refrigerant channels 37 extends along the axial direction of the radiant heat exchanging portion 20. The plurality of second refrigerant channels 37 in the wall of each heat exchange tube 36 are uniformly distributed along the circumferential direction of the heat exchange tube 36. The cross section of the second refrigerant channels 37 in the wall of each heat exchange tube 36 may include a circle and a polygon, the polygon may be a rectangle or an approximately rectangle structure, and the polygon second refrigerant channels 37 and the circle second refrigerant channels 37 are sequentially and alternately arranged along the circumferential direction of the heat exchange tube 36. The hydraulic radius of each second refrigerant channel 37 is 0.6-10 mm.
The tubular structure includes at least two heat exchange cartridges 36. In every two adjacent heat exchange cylinders 36, the height of each second refrigerant channel 37 on the outer heat exchange cylinder 36 extending along the radial direction of the radiant heat exchanging part 20 is greater than the height of each second refrigerant channel 37 on the inner heat exchange cylinder 36 extending along the radial direction of the radiant heat exchanging part 20.
In some embodiments of the present invention, the convection heat exchanging part 30 defines a central channel 38 extending in an axial direction of the radiant heat exchanging part 20, and is located at the center of the space inside the radiant heat exchanging part 20. The central passage 38 may be configured to circulate air or coolant. In other embodiments, both ends of the central channel 38 are provided with a closed structure, and the central channel 38 may also be configured to provide fittings such as shunt tubes. Each of the first refrigerant channel 32/second refrigerant channel 37 is preferably a microchannel tube. The heat exchange plate 31, the heat exchange cylinder 36, the support cylinder and the radiant heat exchange part 20 can be made of copper or aluminum.
In some embodiments of the present invention, in order to facilitate the manufacturing, the convection heat exchanging part 30 is formed by an extrusion process, that is, the convection heat exchanging part is preferably an integrated workpiece. Alternatively, the entire structure of the convection heat exchanging part 30 and the radiant heat exchanging part 20 is formed by an extrusion process. That is, the entire body constituted by the convection heat exchanging portion and the radiant heat exchanging portion 20 is an integrated workpiece. The integrated workpiece is extruded, the radiating fins 33 are directly communicated with the wall surfaces of the first refrigerant channel 32/the second refrigerant channel 37, the integrated workpiece belongs to the same component, the problem of thermal contact resistance does not exist between the radiating fins and the wall surfaces of the first refrigerant channel 32/the second refrigerant channel 37, the thermal contact resistance between the radiating fins and the wall surfaces of the second refrigerant channel can be obviously reduced, and the heat transfer performance is improved. The air flow path between the flat sheets is regular, and the air flow path and the refrigerant channel are processed in an integral extrusion mode, so that the air flow path is easy to form.
In some embodiments of the present invention, the refrigerant pipeline further has a main inlet pipe and a main outlet pipe; one end of each of the first refrigerant channel 32/the second refrigerant channel 37 is communicated with the main inlet pipe, and the other end is communicated with the main outlet pipe, so that the plurality of first refrigerant channels 32/the second refrigerant channels 37 are connected in parallel.
In other embodiments of the present invention, the radiant convection heat exchanger can have at least one parallel unit, each parallel unit having a plurality of channel groups. Each channel group is provided with at least one first refrigerant channel 32/second refrigerant channel 37; the head and the tail of the plurality of channel groups of each parallel unit are sequentially connected in series. When the number of the parallel units is multiple, the multiple parallel units are connected in parallel. Each channel group may have one heat exchanger plate 31 as described above. For example, the number of the heat exchange plates 31 is 8, wherein every 2 heat exchange plates 31 constitute 2 channel groups, and the heat exchange plates are arranged in series end to end, that is, every 2 heat exchange plates 31 constitute one parallel unit, that is, 4 parallel units in total, and the 4 parallel units are connected in parallel with each other. Further, both ends of each heat exchange plate 31 are provided with a collecting inlet pipe and a collecting outlet pipe so as to facilitate the reasonable arrangement of the pipelines.
The embodiment of the utility model provides an air conditioner is still provided, it can include compressor, condenser, throttling arrangement and evaporimeter. The evaporator and/or the condenser adopt the radiation convection type heat exchanger in any embodiment. Preferably, only the evaporator employs the radiant convection heat exchanger of any of the embodiments described above. Further, one end of the radiant heat exchanging part 20 may be provided with a fan to force air to enter the inside of the radiant heat exchanging part 20 to exchange heat with the convection heat exchanging part.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A radiant convective heat exchanger comprising:
a radiant heat exchanging part having a cylindrical shape with both ends open, configured to absorb heat or cold from an inner wall surface thereof, and radiate the heat or cold outward from an outer wall surface thereof; and
a convection heat exchanging part disposed at an inner side of the radiation heat exchanging part, configured to generate heat or cold, and to transfer the heat or cold to air flowing through the inner side of the radiation heat exchanging part and to transfer the heat or cold to an inner wall surface of the radiation heat exchanging part; and is
The heat convection part comprises a refrigerant pipeline and a plurality of radiating fins arranged on the refrigerant pipeline;
each radiating fin is a flat sheet fin.
2. Radiation convection heat exchanger of claim 1,
each of the heat dissipation fins extends in an axial direction of the radiation heat exchanging portion.
3. Radiation convection heat exchanger of claim 2,
the refrigerant pipeline comprises a plurality of heat exchange plates; each heat exchange plate has a first edge and a second edge extending in an axial direction of the radiant heat exchange portion; the first edge is arranged in the middle of the space inside the radiation heat exchange part, and the second edge is connected to the inner wall surface of the radiation heat exchange part; the heat exchange plates are sequentially arranged along the circumferential direction of the radiation heat exchange part;
and a plurality of radiating fins which are sequentially arranged in the direction that the corresponding first edge points to the second edge are arranged on the two sides of each heat exchange plate.
4. A radiation convection heat exchanger as set forth in claim 3,
each heat exchange plate and the radial direction of the radiation heat exchange part facing to the second edge of the heat exchange plate are arranged in a crossed mode; or
Each heat exchange plate extends along the axial direction of the radiant heat exchange part and extends along the radial direction of the radiant heat exchange part.
5. A radiation convection heat exchanger as set forth in claim 3,
each heat dissipation fin is perpendicular to the corresponding heat exchange plate.
6. Radiation convection heat exchanger of claim 5,
each heat exchange plate is internally provided with a plurality of first refrigerant channels, each first refrigerant channel extends along the axial direction of the radiation heat exchange part, and
in each heat exchange plate, the first edge points to the direction of the second edge, and a plurality of first refrigerant channels are arranged in sequence;
the ratio of the number of the first refrigerant channels to the number of the radiating fins on each side of the first refrigerant channels is 4/5-10/1 from the first edge to the second edge;
the cross section outline of each first refrigerant channel is a rectangle, and the long side of the rectangle is perpendicular to the corresponding heat exchange plate.
7. Radiation convection heat exchanger of claim 2,
the refrigerant pipeline comprises a plurality of coaxially arranged cylindrical structures, and each cylindrical structure is coaxially arranged with the radiation heat exchange part;
the cylindrical structure comprises at least one heat exchange cylinder, and one or more second refrigerant channels are arranged on the wall of each heat exchange cylinder; and is
A fin layer is arranged between every two adjacent cylindrical structures, and each fin layer is provided with a plurality of radiating fins which are uniformly distributed along the circumferential direction of the radiation heat exchanging part.
8. A radiation convection heat exchanger as set forth in claim 7,
a fin layer is arranged between the cylindrical structure at the outermost side and the inner wall surface of the radiation heat exchange part; or the outer wall surface of the outermost cylindrical structure and the inner wall surface of the radiation heat exchange part are integrally formed or abut against each other in a contact mode.
9. Radiation convection heat exchanger of claim 1,
the convection heat exchange part is an integrated workpiece and is formed by adopting an extrusion process; or the like, or, alternatively,
the whole formed by the convection heat exchange part and the radiation heat exchange part is an integrated workpiece and is formed by adopting an extrusion process.
10. An air conditioner comprises an evaporator and a condenser, and is characterized in that,
the evaporator and/or the condenser employ the radiation convection type heat exchanger as claimed in claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920047809.8U CN209877157U (en) | 2019-01-11 | 2019-01-11 | Radiation convection type heat exchanger and air conditioner with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920047809.8U CN209877157U (en) | 2019-01-11 | 2019-01-11 | Radiation convection type heat exchanger and air conditioner with same |
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| Publication Number | Publication Date |
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| CN209877157U true CN209877157U (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201920047809.8U Active CN209877157U (en) | 2019-01-11 | 2019-01-11 | Radiation convection type heat exchanger and air conditioner with same |
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| CN (1) | CN209877157U (en) |
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