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Parallel flow heat exchanger with high heat exchange efficiency

A technology of parallel flow heat exchanger and heat exchange efficiency, which is applied in the direction of evaporator/condenser, lighting and heating equipment, refrigeration components, etc. Problems such as vibration and abnormal sound can be solved, and the effect of improving heat exchange efficiency, convenient installation and uniformity can be achieved

Active Publication Date: 2013-07-31
MIDEA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, after the refrigerant enters the header of the parallel flow heat exchanger, when the refrigerant flow rate is large, the refrigerant is more likely to flow to the flat tube at the far end. To solve this problem, it is often adopted in the header Set the shrinkage hole to make the amount of refrigerant in each flat tube relatively uniform in the process, but this will increase the resistance of the refrigerant flow and increase the power consumption of the refrigerant flow
[0003] In order to improve the flow uniformity, there is also a way to insert a distributor in the header. Its distributor is a section of distribution pipe with a through hole. In this way, holes need to be opened on the end cover, which is more difficult to process. ;In addition, because the insertion side of the insertion tube is not easy to fix, there are often gaseous, liquid, and gas-liquid mixed states in the flow of refrigerant. When the flow of refrigerant is uneven, vibration and abnormal sound will easily occur
In addition, when using the insert tube type distributor, since there is a certain distance between the insert tube and the inner chamber of the collecting pipe, the refrigerated oil will precipitate and accumulate at the bottom of the inner chamber of the collecting pipe under condensation or low temperature conditions. Cannot be sucked into the refrigerant circuit by the plug-in distributor
When both conditions of sufficient and insufficient refrigerant flow need to be considered, this kind of plug-in distributor can only meet one of the conditions, and the other situation will be relatively poor, and relative coordination cannot be achieved.
[0004] When the refrigerant enters the lower header from the connection port of the lower header, if the refrigerant flow is sufficient, a region with a large flow will be formed at the far end; if the refrigerant flow is insufficient, a remote area will appear. Insufficient refrigerant flow at the end, and in both cases, the distribution of refrigerant in the heat exchanger will be uneven, resulting in poor heat transfer efficiency of the overall heat exchanger

Method used

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  • Parallel flow heat exchanger with high heat exchange efficiency
  • Parallel flow heat exchanger with high heat exchange efficiency
  • Parallel flow heat exchanger with high heat exchange efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see Figure 1 to Figure 4 , the present embodiment includes an upper header 2, a lower header 3, a flat tube 4, a refrigerant introduction pipe 10, and a flow control plate 6 is arranged in the lower header 3, and the flow control plate 6 divides the lower header into The two cavities are respectively the first cavity 12 and the second cavity 13. The first cavity 12 communicates with the refrigerant introduction pipe 10 arranged at one end of the lower header. Introduced from the side, through the blocking of the end baffle 5, it enters the first cavity 12 from the gap at the bottom of the end baffle 5; the second cavity 13 communicates with each flat tube 4, and at least 3 communication channels are distributed on the flow control plate 6. hole 7, the communication hole 7 communicates with the first cavity 12 and the second cavity 13, so that the liquid refrigerant that enters from the refrigerant introduction pipe 10 enters the first cavity 12, passes through each com...

Embodiment 2

[0032] see Figure 5 The difference between this embodiment and Embodiment 1 is that the shape of the communication hole 7 of the flow control plate is rectangular, and the use of the rectangular communication hole 7 is beneficial to increase the length of the outer perimeter of the through hole and improve the resistance along the way, thereby increasing the resistance And the adjustment ability of the communication hole 7. In addition, the through hole area of ​​the flow control plate communication hole 7 in this embodiment is smaller than that in the first embodiment, so that when the refrigerant flow rate is sufficient, the gap between the first cavity 12 and the second cavity 13 can be increased. Pressure difference, so as to ensure a relatively uniform flow condition when slightly deviating from the maximum flow rate, that is, when the flow rate is increased or decreased.

Embodiment 3

[0034] see figure 1 with Image 6 , the difference between this embodiment and the first embodiment is that the through-hole areas of the communication holes 7 of each flow control plate are different, and, Image 6 The side of the communication holes 7 in the upper part of the central flow control plate 6 with a small distance is located at the refrigerant inlet of the lower liquid collecting pipe 3, and the side with a relatively large distance between the communication holes 7 in the lower part of the flow control plate 6 is located at the far side of the lower liquid collecting pipe 3. 14 at the end. As shown in the figure, the through hole area of ​​the communication holes 7 on the side where the distance between the communication holes 7 on the upper part of the flow control plate 6 is smaller than the through hole area of ​​the communication holes on the side where the distance between the communication holes 7 on the lower part of the flow control plate 6 is large...

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Abstract

The invention provides a parallel flow heat exchanger with high heat exchange efficiency. The heat exchanger comprises an upper collecting pipe, a lower collecting pipe and a plurality of flat pipes arranged between the two collecting pipes, wherein a flow control plate is fixed in the lower collecting pipe and divides the lower collecting pipe into a first cavity and a second cavity; a refrigerant pipe joint is arranged on the wall surface of the first cavity; and the second cavity is communicated with the flat pipes. The heat exchanger is characterized in that at least three communicating holes are arranged on the flow control plate and communicate the first cavity with the second cavity; and at least a distance between a communicating hole and the adjacent communicating hole is different from the distances between other adjacent communicating holes. The heat exchanger has the following beneficial effects: the uniformity of flow in the parallel flow heat exchanger can be improved under the condition of different refrigerant flow rates, thus improving the heat exchange efficiency; such air-conditioners with refrigerants flowing variably as inverter air-conditioners can have higher energy efficiency; and meanwhile, the heat exchanger is more convenient to install and is stable, and the flow resistance is slightly increased under the condition of realizing better uniform flow.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a parallel flow heat exchanger capable of improving the flow uniformity of heat exchanging working fluid and having high heat exchanging efficiency. Background technique [0002] In the prior art, after the refrigerant enters the header of the parallel flow heat exchanger, when the refrigerant flow rate is large, the refrigerant is more likely to flow to the flat tube at the far end. To solve this problem, it is often adopted in the header Setting the shrinkage hole makes the amount of refrigerant in each flat tube relatively uniform in the process, but this will increase the resistance of the refrigerant flow and increase the power consumption of the refrigerant flow. [0003] In order to improve the flow uniformity, there is also a way to insert a distributor in the header. Its distributor is a section of distribution pipe with a through hole. In this way, holes need to be opened on the end ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B39/00
Inventor 刘阳李强佐藤宪一郎
Owner MIDEA GRP CO LTD