This application is a national stage filing under 35 U.S.C. § 371 of International Patent Application Serial No. PCT/CN2017/095370, filed Aug. 1, 2017, which claims the priorities to Chinese Patent Application No. 201610634384.1 titled “HEAT EXCHANGE DEVICE” and filed with the Chinese State Intellectual Property Office on Aug. 3, 2016, and Chinese Patent Application No. 201610629325.5 titled “HEAT EXCHANGE DEVICE” and filed with the Chinese State Intellectual Property Office on Aug. 3, 2016. The entire contents of these applications are incorporated herein by reference in their entirety.
The present application relates to heat exchange apparatus and in particular to a heat exchange device.
CO2 is a new type of environment-friendly refrigerant which can reduce the global greenhouse effect and fundamentally solve the problem of compound pollution to the environment, and has good economy and practicability. A compression refrigeration cycle system with CO2 as the working medium may be employed in most refrigeration/heating fields.
However, the working pressure of a CO2 refrigeration system is high, which should be fully considered in designing a CO2 heat exchange device. This type of system is not widely used since the design of the components of the system is still immature. In general, CO2 heat exchange devices mainly include finned-tube type, microchannel type, plate type, shell-and-tube type, finned-plate type, double-pipe type and the like. Regarding the above types of CO2 heat exchange devices, manufacturing processes of the plate type and finned-plate type are complicated, and tubes having large wall thicknesses are required for the finned-tube type, double-pipe type and shell-and-tube type, which causes material waste.
In addition, the conventional CO2 microchannel heat exchange device exchanges heat through forced convection between the refrigerant and the air, which has low efficiency. Although physical properties of a liquid and the air are greatly different from each other, liquid-air heat exchange has high heat exchange efficiency. However, the liquid-air heat exchange devices in the conventional technology generally have large wall thicknesses of the flow pipes for bearing high pressures, and have a problem of poor heat exchange performance caused by uneven fluid distribution.
Therefore, a technical problem to be addressed is to provide a heat exchange device which is applicable in a relatively high-pressure refrigerant system and has good heat exchange performance.
In order to solve the above technical problem, the following technical solution is provided according to the present application.
A heat exchange device, including a housing and a heat exchange core, wherein a chamber is formed in the housing, and the heat exchange core is partially or completely accommodated in the chamber. The housing is further provided with a third connecting port and a fourth connecting port, and the third connecting port and the fourth connecting port are in communication with the chamber. A first fluid channel is formed in the heat exchange core, and the first fluid channel is isolated from the chamber. The heat exchange device further includes a connecting block, the connecting block is provided with a first channel, a second channel, a first connecting port in communication with the first channel, and a second connecting port in communication with the second channel.
The connecting block is further provided with a first insertion hole of the first channel corresponding to the first channel, and a first insertion hole of the second channel corresponding to the second channel. The heat exchange core includes at least one flat tube, at least a part of the first fluid channel is located in the flat tube. At least a part of one end of the flat tube extends into the first insertion hole of the first channel and is mounted to the first insertion hole of the first channel in a sealed manner, and the first channel is in communication with the first fluid channel; at least a part of another end of the flat tube extends into the first insertion hole of the second channel and is mounted to the first insertion hole of the second channel in a sealed manner, and the second channel is in communication with the first fluid channel.
Compared with the conventional technology, the heat exchange device according to the present application is simple in manufacture and installation, has a light weight, low cost, and has good pressure resistance performance and heat exchange performance.
Specific embodiments of the present application will be illustrated hereinafter in conjunction with accompanying drawings.
The heat exchange core includes at least one flat tube 5, in this embodiment, the heat exchange core includes two flat tubes arranged in parallel. A plurality of tiny fluid channels are formed in each of the flat tubes 5, and the first fluid channel includes the plurality of tiny fluid channels. The heat exchange device 1 is further provided with a first connecting port 21 and a second connecting port 22, and the first connecting port 21 and the second connecting port 22 are located at the first connecting block 2. Two ends of the flat tube 5 communicate with the first connecting port 21 and the second connecting port 22 respectively, such that the first fluid channel is in communication with the first connecting port 21 and the second connecting port 22, respectively. The housing 7 is further provided with a third connecting port 71 and a fourth connecting port 72, a chamber is formed in the housing, the heat exchange core is partially or completely accommodated in the chamber, the third connecting port and the fourth connecting port are in communication with the chamber, and the first fluid channel is isolated from the chamber.
As shown in
Inner diameters or equivalent inner diameters of the bubble-like end portions 314 and 324 are larger than widths of the second straight channels 312 and 322, respectively. The bubble-like end portion 314 of the first channel 31 corresponds to the first connecting port 21, and an inner diameter or equivalent inner diameter of the bubble-like end portion 314 of the first channel 31 is substantially greater than or equal to an inner diameter or equivalent inner diameter of a portion of the first connecting port 21 close to the bubble-like end portion 314 of the first channel 31; and, the bubble-like end portion 324 of the second channel 32 corresponds to the second connecting port 22, and an inner diameter or equivalent inner diameter of the bubble-like end portion 324 of the second channel 32 is substantially greater than or equal to an inner diameter or equivalent inner diameter of a portion of the second connecting port 22 close to the bubble-like end portion 324 of the second channel 32. In this way, local sudden-shrink resistance generated when a fluid flows from the first connecting port 21 to the second straight channel 312 of the first channel 31 and flows from the second straight channel 322 of the second channel 32 to the second connecting port 22 can be effectively reduced, and thereby pressure drop losses of the fluid can be effectively reduced.
The second straight channel 312 and the bending portion 313 are provided in the first channel 31, and a distance is kept between the bending portion 313 of the first channel 31 and the first insertion holes 33 of the first channel 31. In this way, the fluid first flows from the first connecting port 21 and then flows into the tiny fluid channels in the flat tubes 5 through the second straight channel 312 and the bending portion 313 in sequence, so that the fluid does not directly rush toward the flat tubes 5 when flowing from the first connecting port 21, which alleviates the problem of uneven fluid distribution in the tiny fluid channels of the flat tubes 5, and thereby improving the heat exchange performance of the heat exchange device.
Similarly, the second straight channel 322 and the bending portion 32 are provided in the second channel 32, and a distance is kept between the bending portion 323 of the second channel 32 and the first insertion holes 33 of the second channel 32. In this way, the fluid first flows through the bending portion 323 and the first insertion holes 33 and then flows to the second connecting port 22, so that flow resistance generated when the fluid flows from each of the tiny fluid channels of the flat tubes 5 to the second channel 32 is substantially the same, which alleviates the problem of uneven fluid distribution in the tiny fluid channels of the flat tubes 5, and thereby improving the heat exchange performance of the heat exchange device.
Besides, the first connecting port 21 is arranged corresponding to the bubble-like end portion 314 of the first channel 31, and the second connecting port 22 is arranged corresponding to the bubble-like end portion 324 of the second channel 32, in this way, the first channel 31 and the second channel 32 can be flexibly arranged according to positions of the first connecting port 21 and the second connecting port 22, so that the heat exchange device can be applicable in more complicated installation environments.
As shown in
The mounting plate 4 covers the open side of the housing 7. In order to improve the sealing performance, a sealing member 8 is further arranged between the mounting plate 4 and the housing 7, a sealing member groove 41 for mounting the sealing member and screw holes 46 are arranged at a portion of the mounting plate 4 that is in contact with the housing 7, and the mounting plate 4 may be fixedly mounted to the housing 7 by screws. The mounting plate 4 is further provided with mounting holes 47 for mounting the heat exchange device.
It should be noted that, the mounting plate may be integrated with the connecting block; or, the connecting block may further has the function of the mounting plate, in this case, the connecting block is further provided with the sealing member groove and the screw holes, and in this embodiment, the second insertion holes are not required. Of course, the mounting plate may also be arranged at other positions of the housing or be fixed to other parts of the housing, to function to fix the heat exchange device.
As shown in
In this embodiment, by providing sealed channels in the first connecting block and/or the second connecting block, not only the channels have high pressure resistance performance and are not prone to deform under high pressures, but also the structures are simple, the processing is convenient, and the costs are low.
As shown in
Multiple straight portions 51, multiple first bending portions 52, and multiple second bending portions 53 are formed by bending the flat tube 5, where the first bending portions 52 are away from the mounting plate 4, the second bending portions 53 are close to the mounting plate 4, and the multiple straight portions 51 are substantially parallel to each other. A certain distance is kept between two adjacent straight portions 51, and the distance between two adjacent straight portions 51 ranges from 0.5 mm to 6 mm. Fins 6 are further arranged between two adjacent straight portions 51, and the fins 6 are mostly located in a space between the two adjacent straight portions 51. The fins 6 may be zigzag fins, or may be other forms of fins, such as dimple plates, twisted strips, perforated fins, spiral coils, and straight fins, etc. The fins 6 arranged between two adjacent straight portions 51 can improve the flow disturbing performance of the fluid, thereby improving the heat exchange performance of the heat exchange device. At each of ends close to a corresponding first bending portion 52, the fins are spaced apart from the first bending portion 52 by a certain distance, that is, each of the straight portions 51 includes a first finless region 511 where no fin is provided, which is located at the end close to the first bending portion 52. A first through-flow region 513 is formed between two adjacent first finless regions 511 or between a first finless region 511 and an inner wall, and at the end close to the first bending portion 52, the distance between the fins and the first bending portion 52 ranges from 5 mm to 30 mm. Since no fin is provided at a portion of an end of the straight portion 51 close to the first bending portion 52, the flow resistance of the fluid in the first through-flow region 513 between two adjacent straight portions is small. The fluid may first flow in a width direction of the flat tube 5 located at the first bending portion 52 and the first through-flow region 513, and the fluid in a space between any set of adjacent straight portions may be substantially distributed uniformly in the space or in the width direction of the flat tube. Then the fluid flows in a length direction of the straight portion 51 between the adjacent flat tubes, so that the fluid can be uniformly distributed in the width direction and length direction of the flat tube, thereby improving the heat exchange performance of the heat exchange device.
Similarly, at each of ends close to a corresponding second bending portion 53, the fins are spaced apart from the second bending portion 53 by a certain distance, that is, each of the straight portions 51 further includes a second finless region 512 where no fin is provided, which is located at the end close to the second bending portion 53. A second through-flow region 514 is formed between two adjacent second finless regions 512 or between a second finless region 512 and the inner wall, and at the end close to the second bending portion 53, the distance between the fins and the second bending portion 53 ranges from 5 mm to 30 mm. Since no fin is provided at a portion of an end of the straight portion 51 close to the second bending portion 53, flow paths of the fluid in length directions of the straight portions provided with the fins 6 are substantially the same, and the flow resistance of the fluid flowing in the length directions of the straight portions provided with the fins 6 is substantially the same, which is favorable for the uniform distribution of the fluid, thereby improving the heat exchange performance.
Each fin 6 is provided with a composite layer, and the fins 6 and the flat tube 5 may be fixed together by brazing or the like.
In this embodiment, the housing 7 includes an outer housing 701 and a partition member 702. Both the outer housing 701 and the partition member 702 may be an integrally formed injection molding piece or an integrally formed casting piece, which may be integrally formed by a material chosen according to properties of the fluid in the first fluid channel and the application environment. As shown in
The first wall portion 732 is arranged between the first chamber 73 and the third chamber 75, and the second wall portion 742 is arranged between the second chamber 74 and the third chamber 75. The first wall portion 732 corresponding to the third connecting port 71 is provided with a first communication hole 731, and the first chamber 73 communicates with the third chamber 75 through the first communication hole 731; and, the second wall portion 742 corresponding to the fourth connecting port 72 is provided with a second communication hole 741, and the second chamber 74 communicates with the third chamber 75 through the second communication hole 741.
A projection of the third connecting port 71 on the first wall portion 732 does not interfere with the first communication hole 731, and a projection of the fourth connecting port 72 on the second wall portion 742 does not interfere with the second communication hole 741. A projection of the first finless regions 511 on the first wall portion 732 partially or completely overlaps with the first communication hole 731, and a projection of the fins 6 on the first wall portion 732 does not overlaps with the first communication hole 731. A projection of the second finless regions 512 on the second wall portion 742 partially or completely overlaps with the second communication hole 741, and a projection of the fins 6 on the second wall portion 742 does not overlaps with the second communication hole 741.
Moreover, the first communication hole 731 includes a plurality of small communication holes having small path sizes, and each of the small communication holes corresponds to at least one first through-flow region 513, that is, a projection of each of the first through-flow regions 513 on the first wall portion 732 is located at a small communication hole. As shown by the arrows in
Apparently, the second communication hole 741 may also be provided with a plurality of small communication holes having small path sizes.
An outwardly extending portion 76 is provided at the open side of the housing 7, the outwardly extending portion 76 is provided with multiple screw holes 761, and the screw holes 761 of the outwardly extending portion cooperate with the screw holes 46 of the mounting plate. The housing 7 and the mounting plate 4 are fixedly assembled by the screws 9 and sealed by the sealing member 8.
After flowing from the first connecting port 71′ into the first sub-chamber 733, the fluid flows through the first sub-communication hole 7311 into a part of the first through-flow regions 513, then flows through the fins 6 to a part of the second through-flow regions 514, then flows through the second communication hole and the second chamber 74 to another part of the second through-flow regions 514, then flows through the fins 6 and another part of the first through-flow regions 513, then flows through the second sub-communication hole 7312 into the second sub-chamber 734, and then flows out of the heat exchange device through the fourth connecting port 72′. With such arrangement, a flow path of the first fluid can be increased, so that the heat exchange of the first fluid may be more fully, thereby improving the heat exchange performance of the heat exchange device. Moreover, under the same heat exchange performance, the present heat exchange device may have a smaller size which decreases the size of the heat exchange device, and miniaturizes the heat exchange device.
Another difference between this embodiment and the above embodiment is that in this embodiment, the heat exchange device includes only one connecting block 2′. As shown in
It should be noted that, there may be only one of the two differences exist in this embodiment, and other parts of this embodiment may be the same as or similar to the above embodiment. In order to facilitate the illustration, the two differences are placed in one embodiment herein.
Other structures and features of this embodiment are the same as or similar to those of the above embodiment, which will not be described herein again.
The embodiments described hereinabove are only specific embodiments of the present application, and are not intended to limit the scope of the present application in any form. Although the present application is disclosed by the above preferred embodiments, the preferred embodiments should not be interpreted as a limitation to the present application. For those skilled in the art, many variations, modifications or equivalent replacements may be made to the technical solutions of the present application by using the methods and technical contents disclosed hereinabove, without departing from the scope of the technical solutions of the present application. Therefore, any simple modifications, equivalent replacements and modifications, made to the above embodiments based on the technical essences of the present application without departing from the technical solutions of the present application, are deemed to fall into the scope of the technical solution of the present application.
Number | Date | Country | Kind |
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201610629325.5 | Aug 2016 | CN | national |
201610634384.1 | Aug 2016 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2017/095370 | 8/1/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/024185 | 2/8/2018 | WO | A |
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