CN114754507A - Composite low-temperature negative-pressure dividing wall type heat exchanger for extremely-low-temperature region refrigerator - Google Patents
Composite low-temperature negative-pressure dividing wall type heat exchanger for extremely-low-temperature region refrigerator Download PDFInfo
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- CN114754507A CN114754507A CN202210238587.4A CN202210238587A CN114754507A CN 114754507 A CN114754507 A CN 114754507A CN 202210238587 A CN202210238587 A CN 202210238587A CN 114754507 A CN114754507 A CN 114754507A
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- 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
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
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- 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
- F25B39/00—Evaporators; Condensers
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- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The application belongs to refrigeration and low temperature engineering field, discloses a compound low temperature negative pressure dividing wall type heat exchanger for extremely low temperature district refrigerator, includes: the heat exchanger comprises an upper top cover, a baffle, a lower top cover, a high-pressure outlet connecting pipe, a sleeve, a copper wire mesh, a stainless steel wire mesh, an inner pipe of a pipe-in-pipe heat exchanger and an outer pipe of the pipe-in-pipe heat exchanger. The heat exchanger is applied to a final stage refrigerating unit of a refrigerating machine in an extremely low temperature region, has a compact structure, can be used as a high-efficiency negative pressure dividing wall type heat exchanger in an extremely low temperature gas-liquid two-phase region, and can also be used as a high-low pressure fluid dividing three-way structure of a final stage pipe sleeve heat exchanger, so that the axial heat conduction loss of the final stage dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature region is reduced, the flow speed of low-mass flow fluid in the extremely low temperature region is increased, the heat exchange area of the fluid in a gas-liquid two-phase flow region is increased, the heat exchange efficiency of the final stage dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature region is improved, and the heat exchanger has a very positive significance for the application of the refrigerating machine in the extremely low temperature region, aerospace and other special fields.
Description
Technical Field
The application relates to the field of refrigeration and low-temperature engineering, in particular to the technical field of JT refrigerators.
Background
The JT refrigerator (Joule-Thomson Cooler) is a typical dividing wall type refrigerator, which can be used as an important technical means for realizing refrigeration in an extremely low temperature region below liquid helium under the condition of pre-stage precooling, and has important and wide application in the field of low temperature refrigeration below 120K.
The low-temperature negative-pressure dividing wall type heat exchanger is one of the important key components of the compound refrigerator in the extremely low temperature region, the heat exchange efficiency of the low-temperature negative-pressure dividing wall type heat exchanger greatly influences the performance of the whole compound refrigerator, even directly relates to whether the whole compound refrigerator can normally operate, and the efficiency of the low-temperature negative-pressure dividing wall type heat exchanger is generally required to be more than 97%. Because the heat exchange quantity of the low-temperature negative-pressure dividing wall type heat exchanger is far larger than the final refrigerating capacity of the composite refrigerator (by more than one order of magnitude), the loss of the low-temperature negative-pressure dividing wall type heat exchanger is increased, so that the efficiency of the refrigerator is sharply reduced, and the low-temperature negative-pressure dividing wall type heat exchanger is particularly obvious at low temperature.
In the refrigeration cycle of the extremely low temperature region, the efficiency of the final-stage low-temperature negative-pressure dividing wall type heat exchanger working below the precooling temperature directly influences the final-stage refrigeration temperature and the final-stage refrigeration capacity of the precooling type JT refrigerator, so that the improvement of the efficiency of the final-stage low-temperature negative-pressure dividing wall type heat exchanger is very important. The heat exchange area of the final-stage low-temperature negative-pressure dividing wall type heat exchanger is increased, so that the heat exchange quantity can be increased, and the heat exchange efficiency of the low-temperature negative-pressure dividing wall type heat exchanger is improved, but the final-stage low-temperature negative-pressure dividing wall type heat exchanger usually works in an extremely low-temperature region below 20K or even 1K, helium is converted into a gaseous state from a gas-liquid two-phase state in the temperature region, the nonideal property of the helium gradually becomes obvious, the specific heat capacity difference of gases on the high-pressure side and the low-pressure side of the dividing wall type heat exchanger is obvious, the density is sharply reduced along with the temperature reduction, the high-pressure side gases cannot be fully cooled before throttling, and the overall performance of the composite refrigerator is influenced. At present, the efficient low-temperature negative-pressure dividing wall type heat exchanger which can be effectively used for a composite refrigerator working in a temperature region below liquid helium is not common.
It can be seen that the efficiency of the low-temperature negative-pressure dividing wall type heat exchanger in the prior art still needs to be further improved.
Disclosure of Invention
The utility model aims to provide a compound low temperature negative pressure dividing wall type heat exchanger is used to compound refrigerator in utmost point low temperature district not only has higher efficiency to improve the heat exchange efficiency of compound refrigerator in utmost point low temperature district with last stage dividing wall type heat exchanger, the structure is compacter moreover.
The application discloses utmost point low temperature district is compound low temperature negative pressure dividing wall type heat exchanger for refrigerator, its characterized in that includes: an upper top cover, a baffle plate, a lower top cover, a high-pressure outlet connecting pipe, a sleeve, a copper wire mesh, a stainless steel wire mesh, an inner pipe of a pipe-in-pipe heat exchanger and an outer pipe of the pipe-in-pipe heat exchanger, wherein,
the inner pipe of the pipe-in-pipe heat exchanger and the outer pipe of the pipe-in-pipe heat exchanger are two parts of a dividing wall type pipe-in-pipe heat exchanger, the upper top cover is connected with the sleeve and the inner pipe of the pipe-in-pipe heat exchanger, and the lower top cover is connected with the outer pipe of the fixed pipe-in-pipe heat exchanger;
the baffle is connected with the inner wall of the sleeve (5); and is provided with
The copper wire meshes are spaced by at least one layer of stainless steel wire mesh.
In a preferred embodiment, the upper top cover is used for sealing the cold end fluid of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator and is also used for fixing the inner pipe of the pipe-in-pipe heat exchanger, and the upper top cover separates the high-pressure fluid channel and the low-pressure fluid channel in the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator by using the action of a tee joint.
In a preferable embodiment, the baffle is used for fixing a copper wire mesh and a stainless steel wire mesh in the sleeve, and the baffle is welded on the inner wall of the sleeve (5) through laser welding.
In a preferred embodiment, the lower top cover is used for sealing hot end fluid of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator and is also used for fixing an outer pipe of the pipe-in-pipe heat exchanger.
In a preferred embodiment, the sleeve is used for fixing the copper wire mesh and the stainless steel wire mesh and is used as a high-pressure fluid channel, wherein the copper wire mesh is a porous medium and divides the fluid into multiple streams so as to increase the contact area between the copper wire mesh and the fluid, increase the flow rate of the fluid and enhance the heat exchange efficiency, and the copper wire mesh is separated from the stainless steel wire mesh by multiple layers so as to reduce the axial heat conduction loss of the heat exchanger by utilizing the characteristic of weak heat conductivity of the stainless steel wire mesh.
In a preferred embodiment, the tube-in-tube heat exchanger inner tube and the tube-in-tube heat exchanger outer tube are two parts of a dividing wall type tube-in-tube heat exchanger, wherein a low pressure fluid flows in the tube-in-tube heat exchanger inner tube and a high pressure fluid flows in an annular region intermediate the tube-in-tube heat exchanger inner tube and the tube-in-tube heat exchanger outer tube, wherein the high and low pressure fluids flow in opposite directions.
In a preferred embodiment, the upper top cover, the baffle, the lower top cover, the high-pressure outlet connecting pipe, the sleeve, the stainless steel wire mesh and the outer pipe of the pipe-in-pipe heat exchanger are of stainless steel structures.
In a preferred embodiment, the upper top cover is connected with the sleeve and the inner pipe of the pipe-in-pipe heat exchanger through laser welding or argon arc welding.
In a preferred embodiment, the lower top cover is connected with the outer pipe of the fixed pipe-in-pipe heat exchanger through laser welding or argon arc welding.
In the embodiment of the application, the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerating machine is applied to the final stage refrigerating unit of the composite type low-temperature region refrigerating machine, is compact in structure, can be used as a gas-liquid two-phase region high-efficiency negative-pressure dividing wall type heat exchanger of the extremely low temperature region, and can also be used as a three-way structure for high-pressure and low-pressure fluid shunting of a final stage pipe sleeve heat exchanger. The invention not only reduces the axial heat conduction loss of the final-stage dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region and increases the flow velocity of low-mass flow fluid in the extremely low temperature region, but also increases the heat exchange area of the fluid in a gas-liquid two-phase flow region and improves the heat exchange efficiency of the final-stage dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region.
Compared with the prior art, the invention has the following advantages:
Firstly, in the prior art, when the temperature of the low-temperature negative-pressure dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region is below 20K, along with the temperature reduction, helium is changed from a gas state to a gas-liquid two-phase flow state, the density of the helium is obviously increased, especially, helium flow with small flow rate at a high pressure side causes slow flow of fluid in the heat exchanger, the heat exchange coefficient between the helium fluid and the wall surface is low, certain heat exchange needs a large heat exchange area to meet the requirement, and meanwhile, a tee joint structure is needed to be arranged to separate high-pressure fluid from low-pressure fluid separately, which is not favorable for the compactness of the structure. The composite low-temperature negative-pressure dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature region can be used as a high-efficiency negative-pressure dividing wall type heat exchanger in a gas-liquid two-phase region of the extremely low temperature region and can also be used as a three-way structure for high-pressure and low-pressure fluid diversion of a pipe-in-pipe heat exchanger at the last stage, so that the structure of the refrigerating unit at the last stage of the composite refrigerating machine is more compact while heat exchange is ensured.
Secondly, in the prior art, the low-pressure side helium flow in the low-temperature negative-pressure dividing wall type heat exchanger is in a gas-liquid two-phase flow area below 5K, and is restricted by a fluid channel and a heat exchange area of the low-temperature negative-pressure dividing wall type pipe-in-pipe heat exchanger, and the high-pressure incoming flow helium cannot be sufficiently cooled, so that the temperature of the composite refrigerator is increased before throttling, the lowest temperature which can be reached by throttling is increased, and the refrigerating capacity generated by throttling is reduced. The composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low-temperature region refrigerator adopts a compact wire mesh type porous medium with a large specific surface area in a temperature region below 5K, so that the heat exchange area of high-pressure and low-pressure fluid is increased, the passage area of the fluid is reduced, the flow velocity of the fluid is increased, and the heat exchange efficiency is increased.
Third, in the prior art, in order to minimize the loss caused by the axial heat conduction of the dividing wall type pipe-in-pipe heat exchanger, the dividing wall type pipe-in-pipe heat exchanger is generally made of stainless steel with low heat conductivity. In order to increase the heat exchange amount as much as possible, the heat exchange area needs to be increased, but the shape and the weight of the heat exchanger can be increased by increasing the heat exchange area, which is not beneficial to the space application of the compound refrigerator. The invention fully utilizes the latent heat in the gas-liquid two-phase flow, utilizes the copper wire mesh as the material to improve the heat exchange efficiency, and simultaneously utilizes the stainless steel wire mesh to reduce the axial heat conduction loss of the heat exchanger, after the helium of the gas-liquid two-phase flow is completely converted into a gaseous state, the helium enters the stainless steel pipe sleeve heat exchanger to exchange heat with the incoming high-temperature high-pressure helium gas, thereby fully utilizing the latent heat in the gas-liquid two-phase flow and not enhancing the axial heat conduction loss caused by the large temperature difference of the cold and hot ends of the dividing wall type heat exchanger.
In conclusion, the invention has very positive significance for the application of the precooling type JT refrigerating machine in special fields such as an extremely low temperature region, aerospace and the like.
The respective technical features disclosed in the above summary, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings can be freely combined with each other to constitute various new technical solutions (which should be regarded as having been described in the present specification) unless such a combination of the technical features is technically impossible. For example, in one example, the feature a + B + C is disclosed, in another example, the feature a + B + D + E is disclosed, and the features C and D are equivalent technical means for the same purpose, and technically only one feature is used, but not simultaneously employed, and the feature E can be technically combined with the feature C, then the solution of a + B + C + D should not be considered as being described because the technology is not feasible, and the solution of a + B + C + E should be considered as being described.
Drawings
Fig. 1 is a schematic structural view of a composite type low-temperature negative-pressure dividing wall type heat exchanger for a very low temperature region refrigerator according to a first embodiment of the present application;
fig. 2 is a schematic structural view of an upper top cover of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator according to the first embodiment of the present application;
fig. 3 is a schematic structural view of a baffle structure of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator according to the first embodiment of the present application;
fig. 4 is a schematic structural view of a lower top cover of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator according to the first embodiment of the present application;
fig. 5 is an assembly schematic view of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator according to the first embodiment of the present application.
Wherein:
1: upper top cover
2: baffle plate
3: lower top cover
4: high pressure outlet connecting pipe
5: sleeve barrel
6: copper wire mesh
7: stainless steel wire net
8: inner pipe of pipe-in-pipe heat exchanger
9: outer pipe of pipe-in-pipe heat exchanger
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those of ordinary skill in the art that the claimed embodiments may be practiced without these specific details and with various changes and modifications based on the following embodiments.
The following outlines some of the innovative points of the embodiments of the present application:
through long-term research, the inventor of this application still awaits the technical problem that further improvement is waited to efficiency to low temperature negative pressure dividing wall type heat exchanger among the prior art, creatively provides a compound low temperature negative pressure dividing wall type heat exchanger for extremely low temperature district refrigerator, includes: an upper top cover, a baffle, a lower top cover, a high-pressure outlet connecting pipe, a sleeve, a copper wire mesh, a stainless steel wire mesh, an inner pipe of a pipe-in-pipe heat exchanger and an outer pipe of the pipe-in-pipe heat exchanger, the heat exchanger is applied to a final stage refrigerating unit of a refrigerating machine in an extremely low temperature region, has a compact structure, can be used as a high-efficiency negative pressure dividing wall type heat exchanger in an extremely low temperature gas-liquid two-phase region, can also be used as a three-way structure for high-low pressure fluid diversion of a final stage pipe sleeve heat exchanger, not only reduces the axial heat conduction loss of the final stage dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature region, but also increases the flow speed of low-mass flow fluid in the extremely low temperature region, but also increases the heat exchange area of the fluid in the gas-liquid two-phase flow area, improves the heat exchange efficiency of the final-stage dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature area, the method has very positive significance for the application of the refrigerator in special fields such as extremely low temperature areas, aerospace and the like.
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The first embodiment of the present application relates to a composite type low-temperature negative-pressure dividing wall type heat exchanger for a cryogenic zone refrigerator, wherein the cryogenic zone is a temperature zone below liquid helium.
Referring to fig. 1 and 5, the composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator of the present embodiment includes: upper portion top cap 1, baffle 2, lower part top cap 3, high pressure outlet connecting pipe 4, sleeve 5, copper mesh 6, stainless wire net 7, pipe box pipe heat exchanger inner tube 8 and pipe box pipe heat exchanger outer tube 9.
Preferably, upper portion top cap 1, baffle 2, lower part top cap 3, high pressure outlet connecting pipe 4, sleeve 5, stainless steel net 7 and pipe-in-pipe heat exchanger outer tube 9 all are stainless steel construction, and aim at reduces the axial heat conduction loss of heat exchanger, improves the heat transfer effect of heat exchanger.
Fig. 2 shows the middle and upper header 1 of the composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator of the present embodiment. The upper top cover 1 is used for sealing cold-end fluid of the composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator, and is also used for fixing the inner pipe 8 of the pipe-in-pipe heat exchanger, separating high-pressure and low-pressure fluid channels in the heat exchanger by using the action of a tee joint, and connecting the high-pressure and low-pressure fluid channels with the sleeve 5 and the inner pipe 8 of the pipe-in-pipe heat exchanger through laser welding or argon arc welding, wherein the low-pressure fluid continuously flows along the inner pipe 8 of the pipe-in-pipe heat exchanger, and the high-pressure fluid flows out through the high-pressure outlet connecting pipe 4.
Fig. 3 shows the baffle 2 of the composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator of the present embodiment. The baffle 2 is used for fixing a copper wire mesh 6 and a stainless steel wire mesh 7 in the sleeve 5 and is welded on the inner wall of the sleeve 5 by laser welding.
Fig. 4 shows the middle and lower top cover 3 of the composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator of the present embodiment. The lower top cover 3 is used for sealing hot end fluid of the composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator, fixing the outer pipe 9 of the pipe-in-pipe heat exchanger, and connecting the outer pipe 9 of the pipe-in-pipe heat exchanger with the fixed pipe-in-pipe heat exchanger through laser welding or argon arc welding.
The sleeve 5 is used for fixing the internal copper wire mesh 6 and the stainless steel wire mesh 7 and is used as a high-pressure fluid channel.
Furthermore, the copper wire mesh 6 is a porous medium and divides the fluid into a plurality of streams, so that the contact area between the copper wire mesh and the fluid is increased, the flow velocity of the fluid is increased, and the heat exchange efficiency is enhanced. Furthermore, the middle part is separated by a plurality of layers of stainless steel wire meshes 7, and the axial heat conduction loss of the heat exchanger is reduced by utilizing the characteristic of weak heat conductivity of the stainless steel wire meshes.
It should be noted that the inner tube 8 of the tube-in-tube heat exchanger and the outer tube 9 of the tube-in-tube heat exchanger are two parts of the dividing wall type tube-in-tube heat exchanger, wherein the low-pressure fluid flows in the inner tube 8 of the tube-in-tube heat exchanger, the high-pressure fluid flows in the annular region in the middle of the inner tube and the outer tube, and the high-pressure fluid and the low-pressure fluid flow in the reverse direction, thereby forming a complete composite type low-temperature negative-pressure dividing wall type heat exchanger structure for the extremely low temperature region refrigerator.
In this embodiment, the low-pressure fluid is a gas-liquid two-phase flow of helium at a pressure of 0.1MP or less, and the high-pressure fluid is high-pressure helium at a pressure of 1MPa or more.
The composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerating machine is applied to a final stage refrigerating unit of the composite type low-temperature region refrigerating machine, is compact in structure, can be used as a high-efficiency negative-pressure dividing wall type heat exchanger of a gas-liquid two-phase region of the extremely low temperature region, and can also be used as a three-way structure for high-pressure and low-pressure fluid shunting of a final stage pipe sleeve pipe heat exchanger. The embodiment not only reduces the axial heat conduction loss of the final-stage dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region and increases the flow velocity of low-mass flow fluid in the extremely low temperature region, but also increases the heat exchange area of the fluid in a gas-liquid two-phase flow region and improves the heat exchange efficiency of the final-stage dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region.
Compared with the prior art, the embodiment has the following advantages:
firstly, in the prior art, when the temperature of the low-temperature negative-pressure dividing wall type heat exchanger for the composite refrigerator in the extremely low temperature region is below 20K, along with the temperature reduction, helium is changed from a gas state to a gas-liquid two-phase flow state, the density of the helium is obviously increased, especially, helium flow with small flow rate at a high pressure side causes slow flow of fluid in the heat exchanger, the heat exchange coefficient between the helium fluid and the wall surface is low, certain heat exchange needs a large heat exchange area to meet the requirement, and meanwhile, a tee joint structure is needed to be arranged to separate high-pressure fluid from low-pressure fluid separately, which is not favorable for the compactness of the structure. The composite type low-temperature negative-pressure dividing wall type heat exchanger for the refrigerating machine in the extremely low temperature region can be used as a high-efficiency negative-pressure dividing wall type heat exchanger in a gas-liquid two-phase region of the extremely low temperature region and can also be used as a three-way structure for high-pressure and low-pressure fluid diversion of a last-stage pipe-in-pipe heat exchanger, so that the structure of a last-stage refrigerating unit of the composite refrigerating machine is more compact while heat exchange is ensured.
Secondly, in the prior art, the helium flow at the low-pressure side in the low-temperature negative-pressure dividing wall type heat exchanger is in a gas-liquid two-phase flow area below 5K, and the helium flow at the high-pressure incoming flow cannot be sufficiently cooled due to the restriction of a fluid passage and a heat exchange area of the low-temperature negative-pressure dividing wall type pipe sleeve heat exchanger, so that the temperature of the composite refrigerator before throttling is increased, the lowest temperature which can be reached by throttling is increased, and the refrigerating capacity generated by throttling is reduced. The composite low-temperature negative-pressure dividing wall type heat exchanger for the extremely low-temperature region refrigerator adopts a compact wire mesh type porous medium with a large specific surface area in a temperature region below 5K, so that the heat exchange area of high-pressure and low-pressure fluid is increased, the passage area of the fluid is reduced, the flow velocity of the fluid is increased, and the heat exchange efficiency is increased.
Third, in the prior art, in order to minimize the loss caused by the axial heat conduction of the dividing wall type pipe-in-pipe heat exchanger, the dividing wall type pipe-in-pipe heat exchanger is generally made of stainless steel with low heat conductivity. In order to increase the heat exchange amount as much as possible, the heat exchange area needs to be increased, but the shape and the weight of the heat exchanger can be increased by increasing the heat exchange area, which is not beneficial to the space application of the compound refrigerator. According to the embodiment, the latent heat in the gas-liquid two-phase flow is fully utilized, the copper wire mesh is used as a material to improve the heat exchange efficiency, meanwhile, the stainless steel wire mesh is used for spacing to reduce the axial heat conduction loss of the heat exchanger, after the helium in the gas-liquid two-phase flow is completely converted into a gaseous state, the helium enters the stainless steel pipe sleeve heat exchanger to exchange heat with the incoming high-temperature high-pressure helium, so that the latent heat in the gas-liquid two-phase flow is fully utilized, and the axial heat conduction loss caused by the large temperature difference of the cold end and the hot end of the dividing wall type heat exchanger cannot be enhanced.
In summary, the embodiment has a very positive significance for the application of the precooling type JT refrigerator in the special fields of the extremely low temperature region, the aerospace and the like.
It should be noted that in the disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In this application, if a reference is made to performing an action based on an element, it is meant to refer to performing the action based on at least the element, including two cases: performing the action based only on the element, and performing the action based on the element and other elements. The expression of multiple, etc. includes 2, and more than 2, more than 2.
This specification includes combinations of the various embodiments described herein. Separate references to embodiments (e.g., "one embodiment" or "some embodiments" or "a preferred embodiment") do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive, unless indicated as mutually exclusive or as would be apparent to one of ordinary skill in the art. It should be noted that the term "or" is used in this specification in a non-exclusive sense unless the context clearly dictates otherwise.
All documents mentioned in this application are to be considered as being incorporated in their entirety into the disclosure of this application so as to be subject to modification as necessary. Further, it should be understood that various changes or modifications can be made to the present application by those skilled in the art after reading the contents of the present application, and these equivalents also fall within the scope of the claims of the present application.
Claims (9)
1. The utility model provides a compound low temperature negative pressure dividing wall type heat exchanger for extremely low temperature district refrigerator which characterized in that includes: an upper top cover (1), a baffle (2), a lower top cover (3), a high-pressure outlet connecting pipe (4), a sleeve (5), a copper wire mesh (6), a stainless steel wire mesh (7), an inner pipe (8) of a pipe-in-pipe heat exchanger and an outer pipe (9) of the pipe-in-pipe heat exchanger, wherein,
The tube-in-tube heat exchanger inner tube (8) and the tube-in-tube heat exchanger outer tube (9) are two parts of a dividing wall type tube-in-tube heat exchanger, the upper top cover (1) is connected with the sleeve (5) and the tube-in-tube heat exchanger inner tube (8), and the lower top cover (3) is connected with the fixed tube-in-tube heat exchanger outer tube (9);
the baffle (2) is connected with the inner wall of the sleeve (5); and is provided with
The copper wire meshes (6) are spaced by at least one layer of stainless steel wire mesh (7).
2. A composite low-temperature negative-pressure dividing wall type heat exchanger for an extremely low temperature region refrigerator according to claim 1, wherein the upper header (1) is used for sealing the fluid at the cold end of the composite low-temperature negative-pressure dividing wall type heat exchanger for an extremely low temperature region refrigerator and for fixing the tube-in-tube heat exchanger inner tube (8), and the upper header (1) separates the high-pressure and low-pressure fluid passages in the composite low-temperature negative-pressure dividing wall type heat exchanger for an extremely low temperature region refrigerator by the action of the tee joint.
3. A composite type low-temperature negative-pressure dividing wall type heat exchanger for a refrigerator in an extremely low temperature region as claimed in claim 1, wherein said baffle plate (2) is used for fixing a copper wire mesh (6) and a stainless wire mesh (7) in said sleeve (5), and said baffle plate (2) is welded to the inner wall of said sleeve (5) by laser welding.
4. A combined low-temperature negative-pressure dividing wall type heat exchanger for a very low temperature region refrigerator in accordance with claim 1, wherein said lower head cover (3) is used for sealing the hot-end fluid of the combined low-temperature negative-pressure dividing wall type heat exchanger for a very low temperature region refrigerator and for fixing the outer tube (9) of the tube-in-tube heat exchanger.
5. A composite type low-temperature negative-pressure dividing wall type heat exchanger for a refrigerator in an ultra-low temperature zone as set forth in claim 1, wherein the sleeve (5) is used for fixing the copper wire mesh (6) and the stainless steel wire mesh (7) and simultaneously serving as a passage for high-pressure fluid, wherein the copper wire mesh (6) is a porous medium dividing the fluid into multiple streams to increase the contact area with the fluid and simultaneously increase the flow rate of the fluid to enhance the heat exchange efficiency, and the copper wire meshes (6) are spaced by multiple layers of the stainless steel wire meshes (7) to reduce the axial heat conduction loss of the heat exchanger by utilizing the characteristic of weak heat conductivity of the stainless steel wire meshes.
6. A combined low temperature negative pressure recuperator for a chiller of the very low temperature zone as claimed in claim 1 wherein the tube-in-tube heat exchanger inner tube (8) and the tube-in-tube heat exchanger outer tube (9) are two parts of a recuperator, wherein the low pressure fluid flows in the tube-in-tube heat exchanger inner tube (8) and the high pressure fluid flows in an annular region intermediate the tube-in-tube heat exchanger inner tube (8) and the tube-in-tube heat exchanger outer tube (9), wherein the high and low pressure fluids flow in opposite directions.
7. The composite type low-temperature negative-pressure dividing wall type heat exchanger for the extremely low temperature region refrigerator as claimed in claim 1, wherein the upper top cover (1), the baffle (2), the lower top cover (3), the high-pressure outlet connecting pipe (4), the sleeve (5), the stainless steel wire mesh (7) and the outer pipe (9) of the pipe-in-pipe heat exchanger are of stainless steel structure.
8. A composite type low-temperature negative-pressure dividing wall type heat exchanger for a refrigerator in an extremely low temperature region according to claim 1, wherein the upper top cover (1) is connected to the sleeve (5) and the inner tube (8) of the tube-in-tube heat exchanger by laser welding or argon arc welding.
9. A composite type low-temperature negative-pressure dividing wall type heat exchanger for a refrigerator in an extremely low temperature region as claimed in claim 1, wherein the lower top cover (3) is connected to the outer tube (9) of the fixed tube-in-tube heat exchanger by laser welding or argon arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238587.4A CN114754507A (en) | 2022-03-11 | 2022-03-11 | Composite low-temperature negative-pressure dividing wall type heat exchanger for extremely-low-temperature region refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238587.4A CN114754507A (en) | 2022-03-11 | 2022-03-11 | Composite low-temperature negative-pressure dividing wall type heat exchanger for extremely-low-temperature region refrigerator |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09236340A (en) * | 1996-02-28 | 1997-09-09 | Daikin Ind Ltd | Cryogenic refrigerating device |
| CN2620848Y (en) * | 2003-04-11 | 2004-06-16 | 中国科学院理化技术研究所 | Reversable recuperative compact heat exchanger |
| FR3052245A1 (en) * | 2016-06-06 | 2017-12-08 | Soc Fr De Detecteurs Infrarouges - Sofradir | CRYOGENIC DEVICE WITH COMPACT EXCHANGER |
-
2022
- 2022-03-11 CN CN202210238587.4A patent/CN114754507A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09236340A (en) * | 1996-02-28 | 1997-09-09 | Daikin Ind Ltd | Cryogenic refrigerating device |
| CN2620848Y (en) * | 2003-04-11 | 2004-06-16 | 中国科学院理化技术研究所 | Reversable recuperative compact heat exchanger |
| FR3052245A1 (en) * | 2016-06-06 | 2017-12-08 | Soc Fr De Detecteurs Infrarouges - Sofradir | CRYOGENIC DEVICE WITH COMPACT EXCHANGER |
Non-Patent Citations (1)
| Title |
|---|
| 卞诗瑶: "低温旋转阀脉冲管制冷机实验研究", 工程热物理学报, vol. 21, no. 1, pages 5 - 8 * |
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