CN215114108U - Heat pipe, heat exchanger and pressure shell integrated structure - Google Patents
Heat pipe, heat exchanger and pressure shell integrated structure Download PDFInfo
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- CN215114108U CN215114108U CN202121023055.6U CN202121023055U CN215114108U CN 215114108 U CN215114108 U CN 215114108U CN 202121023055 U CN202121023055 U CN 202121023055U CN 215114108 U CN215114108 U CN 215114108U
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Abstract
The utility model discloses a heat pipe, heat exchanger and pressure shell integrated structure, which comprises a heat pipe, a heat exchanger and a pressure shell, wherein the heat exchanger is embedded in the inner cavity of the pressure shell, the inner air passage of the heat exchanger is communicated with an expansion cavity, and the outer air passage is adjacent to the end surface of a heat regenerator; the heat pipe is inserted between the inner side air passage and the outer side air passage of the heat exchanger from the top of the pressure shell in parallel with the axis of the pressure shell; the air passage communication component is arranged between the pressure shell and the heat exchanger and is used for communicating the inner air passage and the outer air passage of the heat exchanger. The integrated structure realizes the casting molding of the heat exchanger in the inner cavity of the pressure shell through the embedded part and the processing technology disclosed by the scheme, and can ensure the air tightness between the heat pipe and the pressure shell and the efficient heat exchange between the heat pipe and the flow passage of the heat exchanger. The configuration does not need welding, has excellent reliability and long service life; for stirling engines, adapted to accommodate non-combustion heat sources; the Stirling refrigerator is used for a Stirling refrigerator and is suitable for scenes needing long-distance cold quantity transmission.
Description
Technical Field
The utility model belongs to the technical field of the stirling device technique and specifically relates to a heat pipe, heat exchanger and pressure shell integrated configuration.
Background
The Stirling device takes Stirling cycle as a working principle and is a closed cycle machine working based on the temperature difference of a heat source; the working medium is usually helium, which is friendly to the environment. The use of the composition is divided into two categories: a so-called stirling engine using a forward stirling cycle and a so-called stirling cooler using a reverse stirling cycle. The Stirling engine is suitable for being applied to scenes such as underwater power, space power, solar disc type power generation, combined heat and power supply and the like; the refrigerator is applied to the fields of infrared and superconducting device cooling, biological and medical refrigeration cold chain and the like.
At least two movers are required inside the stirling machine to achieve the volume change of the expansion chamber and the compression chamber. The rotor with the end part close to the compression cavity is called a power piston or a compression piston, and the rotor with the end part close to the expansion cavity is called an ejector or a gas distribution piston; the reciprocating motion of the two rotors can drive the working medium to reciprocate between the expansion cavity and the compression cavity through the mutually adjacent heat exchanger, the heat regenerator and the cooler runner, and the pressure of the working medium can undergo periodic change asynchronous with the displacement of the rotors in the process, so that heat power conversion is generated. The cooler is arranged between the compression cavity and the normal-temperature end face of the regenerator, is usually in a partition wall fin type or shell-and-tube type, and carries and releases compression heat generated by the working medium in the compression process through external air flow or water flow. The heat exchanger is arranged between the expansion cavity and the non-normal-temperature end face of the heat regenerator, and two structural types, namely a tube bundle type heat exchanger and a fin type heat exchanger, are mainly adopted in the industry at present. The 1KW MCHP model produced by the Microgen company adopts a finned structure; the two types of construction and the operating principle are described on pages 112 to 125 in the book "stirling engine technology" published by harbourne university of engineering press. In a small low-temperature Stirling refrigerator, because the load of a heat exchanger is small, a fin structure or copper foil is generally brazed on the inner wall of a pressure shell after being folded and formed, and the application requirement can be met. For large-scale machines, particularly high-power Stirling engines, the heat exchanger needs to bear a large heat exchange load, and the heat exchange amount can reach dozens or even hundreds of kilowatts. The Stirling engine driven by direct fuel combustion generally adopts a tube bundle type heat exchanger, and the tube bundle type structure has the advantages that the internal empty volume is smaller, but the external surface area of heat exchange is larger, and the distance of flowing of working media in a tube is longer, so that the heat exchange is sufficient. The method has the disadvantages that two ends of each pipe in the pipe bundle need to be welded at corresponding positions on the pressure shell, and dozens to hundreds of welding points are usually formed, so that the assembly and welding processes are complicated; and the welding spot is easy to crack and lose efficacy under the dual actions of thermal stress and internal alternating air pressure.
In the practical application of the Stirling device, when refrigerating capacity of a refrigerating machine such as a low-temperature cold storage is required to be conveyed in a long distance or non-flame combustion type heat is required to be transmitted such as nuclear reaction heat energy, a cold-carrying or heat-carrying secondary circuit is required to be arranged between a cold-using area or a driving heat source and the Stirling device. The secondary loop can adopt adaptive fluid or molten salt pump pressure circulation, and can also adopt a heat pipe as a scheme for transporting cold or heat.
Heat pipes are a utility model of heat transfer elements of the us los alamos national laboratory researchers in the sixties of the last century, with heat transfer capabilities exceeding that of any known metal. Heat pipes have been widely used in aerospace, atomic energy, military and other industries, and are now widely used for electronic heat dissipation. The heat pipe utilizes the phase change process that the medium is condensed at the cold end after being evaporated at the hot end, so that the heat is quickly conducted. The heat pipe generally comprises a pipe shell, a liquid absorption core and an end cover; the tube shell is made of metal materials, and the liquid absorption core is mostly made of capillary porous materials. After the interior of the heat pipe is pumped into a vacuum negative pressure state, a proper amount of working medium is filled, and the heat pipe has the capability of working in a corresponding temperature area. When one end of the heat pipe is heated, the liquid in the capillary tube is quickly vaporized, the vapor flows to the other end under the power of heat diffusion, and is condensed at the cold end to release heat, and the liquid flows back to the evaporation end along the porous material by the capillary action, so that the circulation is not stopped until the temperatures of the two ends of the heat pipe tend to be equal.
The heat pipes can be classified into low-temperature heat pipes, normal-temperature heat pipes, and medium-high temperature heat pipes according to temperature. The high-temperature heat pipe takes liquid metal, such as sodium, potassium and the like as working media; the working medium of the low-temperature heat pipe adopts ammonia, Freon, propane, nitrogen and the like as working media according to the use temperature zone.
The pressure shell on the upper part of the Stirling device is preferably made of a material with good heat resistance and strong cold brittleness resistance, such as high-temperature alloy. Such metals have low thermal conductivity and, if the heat pipe is integrated outside the stirling pressure housing, the system economics are reduced by the large thermal transfer resistance. If the heat pipe is integrated inside the stirling pressure housing, it is necessary to ensure that the structure of the heat pipe penetrating the housing has a reliable gas tightness. The conventional technical scheme is to weld and block leakage of the circumferential seams of the through holes, but the welding points of the pressure shell and the pipe shell are mentioned to reduce the reliability of the system. If the structure can realize excellent air tightness on the premise of high-efficiency heat transfer, the reliability and the product force of the Stirling device are greatly improved.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a heat pipe, heat exchanger and pressure shell integrated configuration, this integrated configuration pass through the built-in fitting and the disclosed processing technology of present case, realize the heat exchanger at the pressure shell inner chamber casting shaping to can guarantee the gas tightness between heat pipe and pressure shell and the high-efficient heat transfer between heat pipe and the heat exchanger runner. The configuration does not need welding, and has excellent reliability and long service life.
The utility model provides a heat pipe, heat exchanger and pressure shell integrated configuration, includes heat pipe, heat exchanger, pressure shell, the inboard air flue and the expansion chamber intercommunication of heat exchanger, the terminal surface that the outside air flue borders on the regenerator still include the air flue intercommunication portion, the heat exchanger is embedded in pressure shell inner chamber top, the axis that the heat pipe is on a parallel with the pressure shell inserts between the inside and outside air flue of heat exchanger from the pressure shell top, the air flue intercommunication portion is located between pressure shell and the heat exchanger for the inboard air flue and the outside air flue of intercommunication heat exchanger.
Preferably, the air passage communicating part is annular, an annular groove is formed in one side, back to the heat exchanger, of the air passage communicating part, hollow bosses with the same number as the heat pipes are uniformly arranged in the annular groove along the circumference, through holes communicated with the inner air passage and the outer air passage of the heat exchanger are uniformly formed in two sides, located on the hollow bosses, of the annular groove along the circumference, and the heat pipes penetrate through the hollow bosses and are inserted into the heat exchanger.
Preferably, in the above technical solution, the diameter of the inner hole of the hollow boss is larger than the outer diameter of the heat pipe, and the hollow boss and the heat pipe are coaxially arranged.
Preferably, the top of the pressure shell is a hollow structure.
Preferably, in the above-described aspect, the melting point of the material used to form the heat exchanger is lower than the melting point of the material used for the gas passage communication portion, the melting point of the material used for the pressure shell, and the melting point of the material used for the heat pipe.
The beneficial effects of the utility model reside in that:
the heat pipe, the heat exchanger and the pressure shell are integrated in the manufacturing process through the creative configuration, the heat exchanger is cast and molded in the inner cavity of the pressure shell through the embedded part and the processing technology disclosed by the scheme, and the air tightness between the heat pipe and the pressure shell and the efficient heat exchange between the heat pipe and the flow channel of the heat exchanger can be guaranteed. The configuration does not need welding, and has excellent reliability and long service life. The heat source is used for a Stirling engine and is very suitable for a nuclear energy heat source; the Stirling refrigerator is used for a Stirling refrigerator and is suitable for scenes needing long-distance cold quantity transmission. The reliability and the product strength of the Stirling device can be greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a longitudinal sectional view of the present invention.
FIG. 3 is a schematic view of the structure of the air channel connection part and the heat pipe for maintaining the air tightness
Fig. 4 is a schematic structural view of the airway communicating portion.
Fig. 5 is a longitudinal sectional view of the heat exchanger during casting.
The reference numbers are as follows: the heat exchanger comprises a heat pipe 1, a heat exchanger 2, a pressure shell 3, an inner air passage 4, an outer air passage 5, an air passage communicating part 6, an annular groove 7, a hollow boss 8, a through hole 9, an upper die 10 and a core column 11.
Detailed Description
The technical solution of the present invention is clearly and completely described below with reference to the accompanying drawings of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The heat pipe, heat exchanger and pressure shell integrated structure as shown in fig. 1 to 4 comprises a heat pipe 1, a heat exchanger 2 and a pressure shell 3, wherein an inner side air passage 4 of the heat exchanger 2 is communicated with an expansion cavity, an outer side air passage 5 is adjacent to the end surface of a heat regenerator, the heat exchanger further comprises an air passage communicating part 6, the heat exchanger 2 is embedded in the top of an inner cavity of the pressure shell 3, the heat pipe 1 is parallel to the axis of the pressure shell 3 and is inserted between the inner side air passage and the outer side air passage from the top of the pressure shell 3, and the air passage communicating part 6 is arranged between the pressure shell 3 and the heat exchanger 2 and is used for communicating the inner side air passage 4 and the outer side air passage 5 of the heat exchanger 2.
In this embodiment, the air passage communicating part 6 is annular, one side of the air passage communicating part 6 is provided with an annular groove 7, a hollow boss 8 is uniformly arranged in the annular groove 7 along the circumference, through holes 9 communicated with the inner air passage 4 and the outer air passage 5 of the heat exchanger 2 are uniformly arranged on two sides of the hollow boss 8 in the annular groove 7 along the circumference, and the heat pipe 1 penetrates through the hollow boss 8 and is inserted into the heat exchanger 2.
In this embodiment, the inner hole diameter of the hollow boss 8 is larger than the outer diameter of the heat pipe 1, and the hollow boss 8 is disposed coaxially with the heat pipe 1.
In this embodiment, the top of the pressure shell 3 is a hollow structure.
In the present embodiment, the melting point of the material used to fabricate the heat exchanger 2 is lower than the melting point of the material used for the gas passage communication portion 6, the melting point of the material used for the pressure shell 3, and the melting point of the material used for the heat pipe 1.
As shown in fig. 5, the processing technology of the heat pipe, heat exchanger and pressure shell integrated structure includes the following specific steps:
preparing a pressure shell 3, preparing a blank of the pressure shell 3 by adopting a vacuum casting or drawing die, and performing machining molding to be used as a lower die for casting the heat exchanger 2;
step two, inserting the heat pipes 1 which are not filled with the working medium into the designed depth along the through holes on the pressure shell 3, the number of which is matched with that of the heat pipes 1;
step three, assembling an air passage communicating part 6, embedding the air passage communicating part 6 into the top of the inner cavity of the pressure shell 3, wherein one side of the air passage communicating part, which is provided with an annular groove 7, is back to the opening direction of the pressure shell 3, and each hollow boss 8 keeps coaxiality with the heat pipe 1 in the hollow boss;
assembling an upper die 10, sequentially inserting the core column 11 into the through hole 9 at the corresponding position on the air passage communicating part 6, inserting the upper die 10 to the designed depth along the direction coaxial with the inner cavity of the pressure shell 3, and enclosing the upper die 10, the air passage communicating part 6, the core column 11 and the inner cavity of the pressure shell 3 into the outline envelope of the heat exchanger 2;
step five, casting the heat exchanger 2, and pouring and molding the heat exchanger 2 at one time;
sixthly, taking out the upper die 10 and the core column 11;
and step seven, filling working medium into the heat pipe 1 and sealing the heat pipe 1, namely finishing the manufacture of the heat pipe, the heat exchanger and the pressure shell integrated structure.
In the pouring process, the liquid material of the heat exchanger can be filled in the annular columnar space between the shell of the heat pipe 1 and the inner hole of the hollow boss 8, after the liquid material is solidified, the working medium in the flow channel of the heat exchanger 2 cannot leak to the environment through the annular gap formed by the heat pipe 1 penetrating through the pressure shell 3, and the air tightness of the integrated structure is ensured.
The utility model creatively applies the air passage communicating part 6 to the processing and manufacturing of the heat exchanger 2, and the detailed structure of the air passage communicating part enables the heat exchanger 2 to adopt the casting process to be molded with the heat pipe 1 and the pressure shell 3 on the premise of ensuring the air tightness; the heat pipe 1 is directly embedded in the heat exchanger 2, and efficiently exchanges heat with the working medium airflow in the flow channel of the heat exchanger 2 in the metal with high heat conductivity, the welding process of the traditional tube bundle type heat exchanger is not needed, the reliability is high, the service life is long, the production and processing cost can be effectively saved, the product strength of the Stirling device can be greatly improved, and the heat pipe has obvious engineering value in the cold and hot application scene of large and medium Stirling devices.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a heat pipe, heat exchanger and pressure shell integrated configuration, includes heat pipe, heat exchanger, pressure shell, the inboard air flue and the expansion chamber intercommunication of heat exchanger, the terminal surface that the outside air flue borders on the regenerator, its characterized in that: the heat exchanger is embedded in the top of an inner cavity of the pressure shell, the heat pipe is parallel to the axis of the pressure shell and is inserted between the inner air passage and the outer air passage of the heat exchanger from the top of the pressure shell, and the air passage communicating part is arranged between the pressure shell and the heat exchanger and used for communicating the inner air passage and the outer air passage of the heat exchanger.
2. The integrated heat pipe, heat exchanger and pressure shell structure of claim 1, wherein: the air passage communicating part is annular, an annular groove is formed in one side, back to the heat exchanger, of the air passage communicating part, hollow bosses the same as the heat pipes in quantity are evenly arranged in the annular groove along the circumference, through holes communicated with the inner side air passage and the outer side air passage of the heat exchanger are evenly formed in the two sides, located in the hollow bosses, of the annular groove along the circumference, and the heat pipes penetrate through the hollow bosses and are inserted into the heat exchanger.
3. The integrated heat pipe, heat exchanger and pressure shell structure of claim 2, wherein: the diameter of the inner hole of the hollow boss is larger than the outer diameter of the heat pipe, and the hollow boss and the heat pipe are coaxially arranged.
4. The integrated heat pipe, heat exchanger and pressure shell structure of claim 1, wherein: the top of the pressure shell is of a hollow structure.
5. The integrated heat pipe, heat exchanger and pressure shell structure of claim 1, wherein: the melting point of the material used for manufacturing the heat exchanger is lower than that of the material used for the air passage communication part, that of the pressure shell and that of the heat pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121023055.6U CN215114108U (en) | 2021-05-13 | 2021-05-13 | Heat pipe, heat exchanger and pressure shell integrated structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121023055.6U CN215114108U (en) | 2021-05-13 | 2021-05-13 | Heat pipe, heat exchanger and pressure shell integrated structure |
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| CN215114108U true CN215114108U (en) | 2021-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113513933A (en) * | 2021-05-13 | 2021-10-19 | 华中科技大学 | Heat pipe, heat exchanger and pressure shell integrated structure and processing technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113513933A (en) * | 2021-05-13 | 2021-10-19 | 华中科技大学 | Heat pipe, heat exchanger and pressure shell integrated structure and processing technology |
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