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Heat exchanger and pulse tube refrigeration machine with heat exchanger

A technology of pulse tube refrigerators and heat exchangers, which is applied in refrigerators, gas cycle refrigerators, refrigeration and liquefaction, etc., can solve the problems of reduced heat recovery efficiency, small length-to-diameter ratio, and failure of refrigerators to refrigerate, so as to achieve improvement. Uniformity problem, the effect of circumferential uniformity of temperature

Active Publication Date: 2019-12-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-power refrigerators, such as hundreds of watts to thousands of watts of cooling capacity, the diameter of the regenerator is very large, the aspect ratio becomes small, and the regenerator is almost cake-shaped. The impact of the heater is very huge, resulting in a sharp drop in heat recovery efficiency, and even causing the refrigerator to fail to cool

Method used

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  • Heat exchanger and pulse tube refrigeration machine with heat exchanger
  • Heat exchanger and pulse tube refrigeration machine with heat exchanger
  • Heat exchanger and pulse tube refrigeration machine with heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A heat exchanger includes such as figure 2 In the shown heat exchange body 22, four fan-shaped areas are arranged inside the heat exchange body 22 along the circumferential direction, and a plurality of mutually parallel inner fins 223 and a plurality of mutually parallel inner fins 223 are arranged in each fan-shaped area. Runner 221.

[0035]Wherein, the heat exchange body 22 includes a ring-shaped heat exchange body wall 225, the inner side of the heat exchange body wall 225 is arranged with a plurality of inner fins 223 along the circumferential direction, and a heat exchanger is formed between two adjacent inner fins 223. In the inner runner 221 , in each sector, two adjacent inner fins 223 are parallel to each other, and two adjacent inner runners 221 of the heat exchanger are parallel to each other.

[0036] In the 4 sectors, the included angle α between the flow channel 221 in the heat exchanger and the axial section of the heat exchange body 22 as a reference...

Embodiment 2

[0042] A heat exchanger includes such as image 3 In the heat exchange body 22 shown, eight sectors are arranged in the interior of the heat exchange body 22 along the circumferential direction, and each sector is provided with a plurality of mutually parallel inner fins 223 and a plurality of mutually parallel inner fins 223 . Runner 221. All the other are with embodiment 1.

[0043] The purpose of dividing into more sectors is to make the heat flux density of the heat exchange body wall 225 more uniform in the circumferential direction, because in each sector, the arrangement of the fins in the circumferential direction is uneven, so at different angles The heat flux is different, and the temperature distribution is also different. If there are too few sectors, the non-uniformity will be large; if there are too many sectors, the radial non-uniformity of the airflow will be large.

Embodiment 3

[0045] In this embodiment, three fan-shaped regions are arranged inside the heat exchange body 22 along the circumferential direction, and the rest are the same as in Embodiment 2.

[0046] Existing heat exchangers such as Figure 4 , Figure 5 As shown, for a conventional heat exchanger, on the outside of the heat exchanger, water flows from the side (such as from the left to the right), and is heated during the flow, so the temperature on the left and right is different. Similarly, it will cause the left and right imbalance of the regenerator, which will cause uneven flow; the flow area inside the heat exchanger is evenly distributed from the inside to the outside, so the flow channel area per unit cross-sectional area decreases from the inside to the outside, causing Regenerator radial airflow distribution is uneven. This problem is not very serious when the heat exchanger is small in diameter, because the aspect ratio is large at this time, and the inlet effect disappears...

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Abstract

The invention relates to a heat exchanger and a pulse tube refrigeration machine with the heat exchanger. The heat exchanger comprises a heat exchange body, wherein multiple sector areas are arrangedalong circumferences inside the heat exchange body; and multiple inner fins in mutual parallel and multiple inner flow ways of the heat exchanger in mutual parallel are disposed in each of the sectorareas. In comparison with the prior art, the heat exchanger disclosed by the invention has the beneficial effects that the multiple sector areas are divided inside the heat exchange body, and the inner flow ways of the heat exchanger in each of the sector areas are made to be mutually parallel, so a total area of airflow channels in a unit area from the outer side to the inner side is same, and the problem that radial airflows are non-uniform when gas reaches a heat regenerator can be solved; and outer fins are disposed along the axial direction of the wall outer side of the heat exchange body, and a flow inlet groove and a flow outlet groove are formed in the outer side of a flow collection device respectively, so the flow collection device is communicated with an outer flow way of the heat exchanger, a fluid is uniformly distributed via a flow groove and then flows axially for heat suction, circumferential uniformity of the helium temperature is ensured, and the problem that the temperature of gas at an inlet of the heat regenerator is not uniform circumferentially because the axial length of the heat exchanger is short and axial cooling can hardly be arranged can be solved.

Description

technical field [0001] The invention belongs to the technical field of pulse tube refrigerators, and relates to a heat exchanger and a pulse tube refrigerator containing the heat exchanger. Background technique [0002] In regenerative refrigerators (such as Stirling refrigerators and pulse tube refrigerators), the working medium is generally helium, and the heat exchanger generally uses a copper column as a heat exchange body, which is cut out inside the copper column with a wire cutting machine. grooves, and the remaining part between the grooves forms the inner fins, and the outer fins are processed on the outside of the copper pillars. Water or other fluids are passed between the outer fins to cool the helium gas passed into the tank. Due to the need for small flow resistance, the general heat exchanger is relatively short, and most of them cut out ring-shaped outer fins on the outside of the copper column. Water passes through one side and flows out from the other side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/14
CPCF25B9/145F25B2309/1412
Inventor 朱绍伟
Owner TONGJI UNIV
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