CN107356008B - Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator - Google Patents
Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator Download PDFInfo
- Publication number
- CN107356008B CN107356008B CN201710580381.9A CN201710580381A CN107356008B CN 107356008 B CN107356008 B CN 107356008B CN 201710580381 A CN201710580381 A CN 201710580381A CN 107356008 B CN107356008 B CN 107356008B
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- slit
- pulse tube
- heat
- stirling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
- F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a coaxial type intermediate heat exchanger of a primary Stirling secondary pulse tube mixed refrigerator. The main structure body of the heat exchanger consists of a slit type heat exchanger and a related flow guide structure, the heat exchanger is a hollow near-columnar structure processed by a high-heat-conductivity material, the slit fin heat exchanger is arranged in the middle, and a through hole is formed in the bottom of the heat exchanger in the radial direction and used for installing an inertia tube. According to the invention, the speed uniformity of an inlet and an outlet of a non-axisymmetric structure and the heat exchange area maximization in a limited volume are realized by increasing the diversion trench and uniformly processing the slit between non-axisymmetric and non-uniform diameters, and the length and depth design of the diversion trench simultaneously meet the requirements of the hollow volume of a first-stage Stirling expansion cavity and the speed uniformity of a second-stage inlet. The invention can effectively improve the overall performance of the coaxial type two-stage Stirling pulse tube mixed refrigerator.
Description
Technical Field
The invention relates to a heat exchanger, in particular to an intermediate heat exchanger of a coaxial type primary Stirling secondary pulse tube mixed refrigerator.
Background
A pulse tube refrigerator in a 20-50K temperature region generally adopts a two-stage structure, a first-stage Stirling two-stage pulse tube mixed refrigerator is used as a novel two-stage refrigerator, a first-stage Stirling cold finger and a second-stage pulse tube heat regenerator are communicated with air flow through an intermediate heat exchanger at the hot end, the two-stage pulse tube mixed refrigerator is driven by a same compressor, cold working medium of the first-stage cold finger enters a second-stage cold finger through the intermediate heat exchanger, cold energy can be provided for the second-stage cold finger, and working gas of the second-stage cold finger enters a low-temperature section heat regenerator for heat regeneration and finally enters the second-stage pulse tube cold finger for refrigeration.
The intermediate heat exchanger is a key part in the first-stage Stirling second-stage pulse tube mixed refrigerator. Ideally, it should fulfill the following main functions:
1) And working medium transmission between the first-stage cold finger and the second-stage cold finger is realized. The working medium can enter the secondary cold finger only after passing through the primary cold finger, so that the flow resistance is reduced as much as possible while the requirement of the intermediate heat exchanger on the transmission of the working medium is met.
2) High-efficiency heat exchange. The intermediate heat exchanger needs to supply cold to the outside, the secondary cold finger heat regenerator and the pulse tube need to pre-cool by the cold energy of the primary cold finger, and especially the heat exchange of the gas in the heat regenerator and the pre-cooling of the secondary pulse tube in the coaxial pulse tube refrigerator need to be realized, so that a larger heat exchange area needs to be realized under the limited volume.
3) And rectifying the working medium entering the secondary heat regenerator. For a coaxial type first-stage Stirling second-stage pulse tube mixed refrigerator, an inertia tube is led out from one side of an intermediate heat exchanger, and the whole intermediate heat exchanger is in a non-centrosymmetric structure, so that the problem of uniformity of airflow entering a second-stage heat regenerator after the airflow passes through the intermediate heat exchanger becomes very important. The fins of the heat exchanger are divided into an upper section and a lower section, and a gap is reserved between the fins of the lower half section of the heat exchanger, so that the function of rectifying the working medium entering the secondary heat regenerator can be realized.
Disclosure of Invention
The invention aims to design an intermediate heat exchanger at the second stage of a first-stage Stirling second-stage pulse tube mixed refrigerator, and solve the problems of high-efficiency transmission of airflow and cold quantity between a first-stage cold finger and a second-stage cold finger and flow uniformity at the inlet of a second-stage cold finger heat regenerator.
In order to achieve the purpose, the intermediate heat exchanger of the primary Stirling secondary pulse tube hybrid refrigerator adopts a nearly cylindrical structure processed by a high-thermal-conductivity material, slit type heat exchange fins 1 arranged on the circumference are arranged on the inner side of the heat exchanger, a flow guide groove 2 is arranged on the lower half section of each fin, and a through hole 3 is formed in the bottom of the heat exchanger in the radial direction.
The upper part of the heat exchanger is connected with the low-temperature section heat regenerator 8, the outer diameter of the heat exchanger is equal to that of the low-temperature section heat regenerator 8, and the lower part of the heat exchanger is connected with the high-temperature section heat regenerator 12; the outer diameter of the lower half section of the heat exchanger is equal to the outer diameter of the regenerator 12 at the high temperature section. The slit type heat exchange fins 1 are in a trapezoidal fin structure which is uniformly and circumferentially arranged, and a diversion trench is arranged between the inner hole diameter of the upper section of the slit body and the outer diameter of the pulse tube 11 of the lower section of the slit body.
The design method of the intermediate heat exchanger comprises the following steps:
firstly, determining the slit cutting width W according to a processing technology;
next, the number of slits n (rounding even):
wherein: d 1 Is the vessel outside diameter;
finally, the slit height H is calculated:
wherein: q is heat exchange quantity of heat exchanger, D 2 The inner diameter of the heat regenerator at the high temperature section, delta T is the temperature difference of the working gas flowing through the heat exchanger, and h is the surface heat exchange coefficient of the working gas and the solid material of the heat exchanger at the temperature T. The invention has the following advantages:
1) Directly connecting the cold end of the Stirling cold finger with the hot end of the pulse tube cold finger through an intermediate heat exchanger to realize direct transmission of cold working medium;
2) The heat end of the pulse tube and the inlet of the inertia tube are in close contact with the intermediate heat exchanger, thereby realizing precooling of the pulse tube and the inertia tube, and having compact structure and small temperature difference;
4) The height of the slit from the lower half section of the slit to the joint of the inertia pipe is slightly smaller than that of the upper half section of the slit to form a diversion trench, and the outer diameter of the slit is the same as the inner diameter of the low-temperature section heat regenerator, so that the air flow entering the low-temperature section heat regenerator is homogenized;
5) The inner diameter of the conical slit body is the same as the outer diameter of the pulse tube, so that the slit body and the pulse tube form good thermal contact to achieve the purpose of precooling the pulse tube, and the refrigeration coefficient of the pulse tube can be effectively improved.
The advantages greatly promote the improvement of the performance of the intermediate heat exchanger of the coaxial type two-stage Stirling pulse tube hybrid refrigerator, and have very important significance for the improvement of the overall performance of the refrigerator.
Drawings
FIG. 1 is a sectional view of the middle heat exchanger of the coaxial type two-stage Stirling pulse tube hybrid refrigerator;
FIG. 2 is a lower view of the intermediate heat exchanger of the coaxial type two-stage Stirling pulse tube hybrid refrigerator;
FIG. 3 is a partial sectional view of a secondary cold finger of the intermediate heat exchanger of the coaxial type secondary Stirling pulse tube hybrid refrigerator; wherein: 1 is a slit type heat exchange fin; 2 is a diversion trench; 3 is an inertia pipe mounting hole; 4 is a vascular diversion wire mesh; 5, the outer wall of the low-temperature section heat regenerator; 6 is an intermediate heat exchanger; 7 is the outer wall of the high-temperature section Stirling; 8 is a low-temperature section heat regenerator filler; 9 is a first welding point; 10 is a second welding point; 11 is a vessel; and 12 is a high-temperature section regenerator.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples. In the description of the present invention, it should be noted that the terms "central", "radial", "upper", "lower", "inner", "outer", "vertical", "horizontal", etc., indicating the orientation or positional relationship are based on the positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in figure 3, the two-stage intermediate heat exchanger of the thermally coupled coaxial two-stage pulse tube refrigerator is made of a material with high thermal conductivity, the heat exchange capacity of the intermediate heat exchanger is 10W, the working temperature is 80K, the outer diameter of a pulse tube 8 is 10.2mm, the inner diameter of a high-temperature section regenerator is 30mm, the width of a slit cut by a slow wire cutting technology is 0.2mm, the temperature difference for controlling the working gas to flow through the heat exchanger is controlled within 1.5K, and the surface heat exchange coefficient of helium and a solid material of the heat exchanger under 80K is 1115W/(m & lt/m & gt) 2 K), calculating the height of the slit of the heat exchanger to be 9mm, uniformly processing a trapezoidal fin structure along the central line of the upper end surface and the lower end surface of the conical slit body to form a slit body by adopting a slow-running wire cutting mode in the middle heat exchanger shown in figure 3, wherein the upper end surface of the conical slit body is flush with the lower end surface of the low-temperature section regenerator filler, and the lower half section of the heat exchanger forms a guide groove with the width of 2 mm.
Thereby forming the intermediate heat exchanger for the coaxial type two-stage Stirling pulse tube mixing refrigerator.
Claims (2)
1. The utility model provides a heat exchanger in middle of mixed refrigerator of coaxial type one-level stirling second grade pulse tube which characterized in that:
the middle heat exchanger is of a nearly cylindrical structure processed by a high-heat-conductivity material, the inner side of the heat exchanger is provided with slit type heat exchange fins (1) which are circumferentially arranged, the lower half sections of the fins are provided with flow guide grooves (2), and the bottom of the heat exchanger is provided with inertia tube mounting holes (3) in the radial direction;
the upper part of the heat exchanger is connected with the low-temperature section heat regenerator (8), the outer diameter of the heat exchanger is equal to that of the low-temperature section heat regenerator (8), and the lower part of the heat exchanger is connected with the high-temperature section heat regenerator (12); the outer diameter of the lower half section of the heat exchanger is equal to the outer diameter of the high-temperature section heat regenerator (12), the slit type heat exchange fins (1) are of a trapezoidal fin structure which is uniformly and circumferentially arranged, the diameter of an inner hole of the upper section of a slit body is equal to the outer diameter of a pulse tube (11), and a diversion trench is arranged between the outer diameters of pulse tubes of the lower section of the slit body.
2. The intermediate heat exchanger of the coaxial type one-stage stirling secondary pulse tube hybrid refrigerator according to claim 1, wherein: the design method of the intermediate heat exchanger comprises the following steps:
firstly, determining the slit cutting width W according to a processing technology;
next, the number of slits 2n:
wherein: d is the outer diameter of the vessel;
finally, the slit height H is calculated:
wherein: q is heat exchange quantity of heat exchanger, D 2 Is the inner diameter D of a regenerator at a high temperature section 1 Is the inner diameter of the regenerator at the low temperature section, and Delta T isThe temperature difference of the working gas flowing through the heat exchanger, and h is the surface heat exchange coefficient of the working gas and the solid material of the heat exchanger at the temperature T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580381.9A CN107356008B (en) | 2017-07-17 | 2017-07-17 | Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580381.9A CN107356008B (en) | 2017-07-17 | 2017-07-17 | Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107356008A CN107356008A (en) | 2017-11-17 |
| CN107356008B true CN107356008B (en) | 2022-11-11 |
Family
ID=60292313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710580381.9A Active CN107356008B (en) | 2017-07-17 | 2017-07-17 | Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107356008B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976099A (en) * | 2017-12-15 | 2018-05-01 | 陕西仙童科技有限公司 | A kind of slit heat exchanger |
| CN110749115B (en) * | 2019-11-11 | 2023-12-26 | 中国科学院上海技术物理研究所 | Multifunctional low-temperature vortex coil precooling heat exchanger |
| CN114963826B (en) * | 2022-05-23 | 2024-05-07 | 西安交通大学 | Freezing target and micro-fin heat capacity device for freezing target ice layer preparation experiment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313395A (en) * | 2010-07-06 | 2012-01-11 | 浙江大学 | Two-stage Stirling and single-stage pulse tube gas coupling cascaded multi-stage low temperature refrigerator |
| CN103062952A (en) * | 2013-01-30 | 2013-04-24 | 浙江大学 | Pulse tube/Stirling gas coupling composite multi-stage refrigerator |
| US20150354861A1 (en) * | 2014-06-05 | 2015-12-10 | Sumitomo Heavy Industries, Ltd. | Stirling-type pulse tube refrigerator |
| CN106642822A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | Secondary intermediate heat exchanger for thermal coupling coaxial two-stage pulse pipe refrigerator and design method |
| CN207299597U (en) * | 2017-07-17 | 2018-05-01 | 中国科学院上海技术物理研究所 | Coaxial type level-one Stirling two level vascular hybrid refrigeration machine Intermediate Heat Exchanger |
-
2017
- 2017-07-17 CN CN201710580381.9A patent/CN107356008B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313395A (en) * | 2010-07-06 | 2012-01-11 | 浙江大学 | Two-stage Stirling and single-stage pulse tube gas coupling cascaded multi-stage low temperature refrigerator |
| CN103062952A (en) * | 2013-01-30 | 2013-04-24 | 浙江大学 | Pulse tube/Stirling gas coupling composite multi-stage refrigerator |
| US20150354861A1 (en) * | 2014-06-05 | 2015-12-10 | Sumitomo Heavy Industries, Ltd. | Stirling-type pulse tube refrigerator |
| CN106642822A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | Secondary intermediate heat exchanger for thermal coupling coaxial two-stage pulse pipe refrigerator and design method |
| CN207299597U (en) * | 2017-07-17 | 2018-05-01 | 中国科学院上海技术物理研究所 | Coaxial type level-one Stirling two level vascular hybrid refrigeration machine Intermediate Heat Exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107356008A (en) | 2017-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107388861B (en) | Hot wall type heat exchanger | |
| CN107356008B (en) | Intermediate heat exchanger of coaxial type primary Stirling secondary pulse tube mixed refrigerator | |
| CN101592411B (en) | Refrigeration cycle device | |
| CN203132196U (en) | Hot end internal guide structure of coaxial-type pulsed tube refrigerating machine | |
| CN103090578B (en) | Coaxial type pulse pipe refrigerator hot end inner diversion structure and manufacturing method thereof | |
| KR20110083996A (en) | Double-piped heat exchanger | |
| CN103998891B (en) | Fin tube type heat exchanger | |
| CN102735088A (en) | Conical slit-type hot end heat exchanger of coaxial pulse tube refrigerator and manufacturing method | |
| CN112212536B (en) | Gas coupling type pulse tube refrigerator split-flow type cold end heat exchanger and design method | |
| CN103765150A (en) | Air conditioner | |
| CN101776357B (en) | Heat exchanger | |
| CN209766599U (en) | Battery cooling pipeline, heat management device and vehicle | |
| CN101713617A (en) | Flat pipe structure of heat exchanger and heat exchanger thereof | |
| CN106642822A (en) | Secondary intermediate heat exchanger for thermal coupling coaxial two-stage pulse pipe refrigerator and design method | |
| CN207299597U (en) | Coaxial type level-one Stirling two level vascular hybrid refrigeration machine Intermediate Heat Exchanger | |
| CN203249422U (en) | Internal flow guide structure at hot end of U-shaped and linear pulse tube refrigerating machine | |
| JP2005265261A (en) | Pulse pipe refrigerator | |
| CN112212719B (en) | Bypass type low-temperature negative pressure heat exchanger for pre-cooling JT (joint temperature) refrigerating machine and design method | |
| CN112240650B (en) | Straight-through slit precooling heat exchanger of precooling type low-temperature throttling refrigerator and manufacturing method | |
| CN211824007U (en) | Heat exchange system | |
| CN105042923A (en) | Pulse tube refrigerating machine pulse tube with slit type pulse tube device | |
| CN104964580A (en) | Tube bundle heat exchanger | |
| CN216159717U (en) | Radiator and air conditioning system with same | |
| CN211739569U (en) | Condenser for air conditioner | |
| CN220601846U (en) | Microchannel heat exchanger and heat exchange system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |