CN105756804B - A kind of hot end heat exchanger for free piston stirling engine - Google Patents
A kind of hot end heat exchanger for free piston stirling engine Download PDFInfo
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- CN105756804B CN105756804B CN201610108454.XA CN201610108454A CN105756804B CN 105756804 B CN105756804 B CN 105756804B CN 201610108454 A CN201610108454 A CN 201610108454A CN 105756804 B CN105756804 B CN 105756804B
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- heat exchange
- heat exchanger
- stirling engine
- runner
- free piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/057—Regenerators
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention provides a kind of hot end heat exchanger for free piston stirling engine, and it includes：Pressure hull；Loaded on the heat exchange fin in the pressure hull, engine expansion chamber is formed between pressure hull and heat exchange fin；The thermal fluid inlet pipeline being placed at the top of the pressure hull；The hot fluid outlet ports pipeline being placed on the outside of the pressure hull；Runner is set in heat exchange fin, the entrance of the runner is connected with the thermal fluid inlet pipeline, and the outlet of the runner is connected with the hot fluid outlet ports pipeline.The present invention has the advantages that heat exchange area is big, heat exchange is uniform compact-sized.
Description
Technical field
The present invention relates to field of heat exchangers, more particularly to a kind of hot junction for free piston stirling engine to exchange heat
Device.
Background technology
Stirling engine also known as thermomotor, it uses Stirling cycle, by the expanded by heating of gas working medium, presses to the cold
Contracting converts heat into mechanical energy, and its theoretical efficiency is equal to Carnot efficiency.Free piston stirling engine is that Stirling starts
A kind of special structure form of machine, belongs to thermo-acoustic engine category.It eliminates the toggle of traditional Stirling engine
And displacer is used its working characteristics to be determined by controlling displacer quality and spring rate etc., as phase modulating mechanism so as to disappear
Except the side force suffered by piston, reduce mechanical wear, improve the service life of engine.Meanwhile free piston stirling is sent out
Motivation employs the technologies such as clearance seal, gas bearing, flat spring support and instead of oil using helium or hydrogen as working medium
Lubricating system, simplify system.Thus, free piston stirling engine has：Thermal source applicability is wide, the thermal efficiency is high, uses
Long lifespan, it is pollution-free the advantages that, generated electricity in space, the field such as solar power generation and biomass power generation is respectively provided with before being widely applied
Scape.
It is the exemplary block diagram of free piston stirling engine as shown in Figure 1.Free piston stirling engine is main
By expansion chamber 7, hot end heat exchanger 2, regenerator 3, displacer 4, cool end heat exchanger 5, compression chamber 6, power piston 8 and linear electric motors
9 grade parts form.Hot end heat exchanger 2 is one of heating power element crucial in engine, there is provided needed for engine Sonic heat changing
Heat, its heat exchange property have highly important influence to the performance of engine.Hot junction in free piston stirling engine
Heat exchanger belongs to high-temperature heat-exchanging, and its performance is by heat transfer medium, temperature, pressure, material property, geometry, arrangement etc.
The influence of many factors.
In practical application, the thermal source of the hot end heat exchanger in free piston stirling engine is usually from high-temperature heat flux
Body.The traditional structure of the high-temperature heat-exchanging used at present mainly includes following two：That is bundled tube and finned.
For bundled tube structure as shown in Fig. 2 the structure is made up of housing 1 and U-tube beam 10, U-tube beam 10 is located at housing 1
Top, it is made up of dozens or even hundreds of minor diameter pipe through bending, the diameter of the usual pipe within 10mm, pipe
Material is generally stainless steel or high-temperature alloy steel.One end connection regenerator of U-tube beam, the other end then connect expansion chamber.
In the bundled tube structure, its specific heat transfer process is：External high temperature hot fluid skims over U-tube beam 10 and and U
Gases at high pressure working medium in type tube bank 10 carries out heat exchange, rejects heat to gas working medium.
The interior outside heat exchange area of this hot end heat exchanger is seriously limited by tube bank quantity and hot area of bed, exchanges hot-fluid
The requirement of body is higher.
Fin structure is as shown in figure 3, the structure is made up of housing 1, internal heat fin 11 and external heat transfer fins 12.
Internal heat fin 11 is welded with housing 1, and the outside that external heat transfer fins 12 put also with housing 1 is welded.
Its specific heat transfer process is：External high temperature hot fluid flows through the external heat transfer fins on the outside of pressure hull
12, internal heat fin 11 is then transferred heat to by heat conduction, transferred heat to finally by internal heat fin 11
Gases at high pressure working medium.
This heat exchanger structure is simple, and interior outside heat exchange area is big, but heat transfer effect is restricted by finned length, heat exchange wing
Sector-meeting forms the larger temperature difference on radial and axial, influences heat transfer effect.
The content of the invention
It is used for free piston stirling engine using hot fluid as heat carrier it is an object of the invention to provide a kind of
Hot end heat exchanger.The hot end heat exchanger for heat exchange area existing for traditional hot end heat exchanger it is small and heat exchange problem of non-uniform, lead to
Cross in heat exchange fin internally and runner is set, hot fluid is introduced inside heat exchange fin using hot-fluid body canal, on the one hand increased
Internal heat transfer surface area, shortens finned length, improves heat exchange efficiency, and it is uneven on the other hand also to solve heat exchange in fin
Problem, have the advantages that heat exchange area is big, heat exchange uniformity is good.
To reach above-mentioned purpose, present invention employs following technical scheme：
A kind of hot end heat exchanger for free piston stirling engine, it includes：
Pressure hull 21；
Loaded on the heat exchange fin 22 in the pressure hull 21, engine is formed between pressure hull 21 and heat exchange fin 22
Expansion chamber 27；
It is placed in the thermal fluid inlet pipeline 23 at the top of pressure hull 21；
It is placed in the hot fluid outlet ports pipeline 24 in the outside of pressure hull 21；
Runner 26 is set in heat exchange fin 22, the entrance of the runner 26 is connected with the thermal fluid inlet pipeline 23,
The outlet of the runner 28 is connected with the hot fluid outlet ports pipeline 24.
Preferably, the runner 28 is L-type runner, and those skilled in the art can also select its alloytype shape as needed
Runner, such as S types etc..
Preferably, the runner 26 radially sets some circles centered on the axial line of heat exchange fin 22.Exchange heat
Runner in fin 22 may include one layer, two layers or more layer, and every layer is uniformly distributed more than ten to tens, interlocks between layers
Arrangement.
Preferably, the heat exchange fin 22 is radially arranged.
Preferably, the inside of runner 26 sets fin to increase the contact area between hot fluid and heat exchange fin 22.
In the present invention, if heat exchange fin 22 has dry plate fin, if in this dry plate fin, can be at interval of a number of
Fin sets runner.
In the present invention, it is to be interference fitted and pass through between the internal face of pressure hull 21 and heat exchange fin 22 lateral surface
The mode of welding ensures contact strength.
In the present invention, the pressure hull 21 is in high temperature and high pressure environment, using stainless steel or high temperature alloy
Material makes；Heat exchange fin 22 is made using red copper material；Thermal fluid inlet pipeline 23 and hot fluid outlet ports pipeline 24 use
High-temperature alloy or stainless steel make.
In the present invention, pressure hull 21 is by stainless steel or high-temperature alloy steel integration machine-shaping, heat exchange fin 22 with
The inwall of pressure hull 21 for interference fit and ensures contact strength by welding；The entrance of the runner 26 and the hot fluid
Entrance pipe 23 is connected, and the outlet of the runner 26 is connected with the hot fluid outlet ports pipeline 24, and connected mode is welding
To form inner sealing pipeline；Thermal fluid inlet pipeline 23 and hot fluid outlet ports pipeline 24 are respectively placed in the top of pressure hull 21
And side.
Present invention also offers a kind of free piston stirling engine, the Stirling engine includes above-mentioned hot junction
Heat exchanger.
In one embodiment of this invention, the radial direction of the horizontal component of the L-type runner in the heat exchange fin 22 circumferentially.
In one embodiment of this invention, the L-type flow channel entry point in the heat exchange fin 22 is located at the upper of heat exchange fin 22
End face, outlet is positioned at the side of heat exchange fin 22.
In one embodiment of this invention, the top of pressure hull 21 corresponds to the L-type runner of heat exchange fin 22 with side
Some through holes of location arrangements.
In one embodiment of this invention, the heat exchange fin 22 and the inwall of pressure hull 21 are interference fit, pass through weldering
Connect to ensure contact strength.
In one embodiment of this invention, the pressure hull 21 is in high temperature and high pressure environment, using stainless steel or
Person's high-temperature alloy material；Heat exchange fin 22 uses red copper material；Thermal fluid inlet pipeline 23 and hot fluid outlet ports pipeline 24 are adopted
With high-temperature alloy or stainless steel.
In one embodiment of this invention, the hot fluid is high-temperature flue gas, high temperature air, high temperature heat conductive oil, liquid gold
Category or other high-temperature heat-conductive fluids.
The present invention is to provide a kind of hot end heat exchanger for free piston stirling engine.Hot fluid passes through hot-fluid
Body entrance pipe 23 introduces hot fluid the runner 26 being uniformly distributed in heat exchange fin 22, the gases at high pressure with engine interior
Working medium is exchanged heat, and is drawn the hot fluid after heat exchange by hot fluid outlet ports pipeline 24, forms circulation loop.Its advantage
It is：
(1) hot fluid is introduced by engine interior heat exchanger by hot-fluid body canal, adds hot fluid and gas working medium
Heat exchange area, improve heat exchange efficiency；
(2) L-type runner is evenly distributed in heat exchange fin, shortens the length of heat exchange fin, improves heat exchange uniformity
And heat exchange efficiency.
Brief description of the drawings
Fig. 1 is the schematic diagram of typical free piston stirling engine；
Fig. 2 is free piston stirling engine hot end heat exchanger typical structure 1；
Fig. 3 is free piston stirling engine hot end heat exchanger typical structure 2；
Fig. 4 is the three-dimensional cutaway view for the hot end heat exchanger structure that the embodiment of the present invention 1 provides；
Fig. 5 is the hot end heat exchanger structure top view that the embodiment of the present invention 1 provides；
Fig. 6 be in Fig. 5 a-a to sectional view；
Fig. 7 is the hot end heat exchanger structure front view that the embodiment of the present invention 1 provides；
Fig. 8 be in Fig. 7 b-b to sectional view；
Reference：1st, housing；2nd, hot end heat exchanger；21st, pressure hull；22nd, heat exchange fin；23rd, thermal fluid inlet pipe
Road；24th, hot fluid outlet ports pipeline；25th, engine expansion chamber；26th, runner；3rd, regenerator；4th, displacer；5th, cool end heat exchanger；
6th, compression chamber；7th, expansion chamber；8th, power piston；9th, linear electric motors；10th, U-tube beam；11st, internal heat fin；12nd, outside is changed
Hot fin.
Embodiment
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1
As shown in Fig. 4,5,6,7,8, a kind of hot end heat exchanger for free piston stirling engine, it includes：It is resistance to
Pressure shell body 21；Loaded on the heat exchange fin 22 in the pressure hull 21, formed and started between pressure hull 21 and heat exchange fin 22
Machine expansion chamber 25；It is placed in the thermal fluid inlet pipeline 23 at the top of pressure hull 21；It is placed in the outside of pressure hull 21
Hot fluid outlet ports pipeline 24；Runner 26, the entrance of the runner 26 and the thermal fluid inlet pipeline are set in heat exchange fin 22
23 are connected, and the outlet of the runner 26 is connected with the hot fluid outlet ports pipeline 24.
Pressure hull 21 is made of one piece by pressure-resistant stainless steel；Heat exchange fin 22 to be radial, circumferentially one layer or
If dried layer L-type runner, entrance is located at the upper surface of heat exchange fin 22, and outlet is positioned at the side bottom surface of heat exchange fin 22.Heat exchange fin
22 are interference fitted with the internal face of pressure hull 21 and increase contact strength by welding, between heat exchange fin 22 and pressure hull 21
Space form engine expansion chamber；The connection side of L-type runner and thermal fluid inlet pipeline 23 and hot fluid outlet ports pipeline 24
Formula is welding to form inner sealing pipeline.Thermal fluid inlet pipeline 23 is solid by welding respectively with hot fluid outlet ports pipeline 24
It is scheduled on upper surface and the lateral surface of pressure hull 21.
The radial direction of the horizontal component of L-type runner in the heat exchange fin 22 circumferentially.The top of the pressure hull 21 and
Side corresponds to some through holes of location arrangements of the L-type runner of heat exchange fin 22.L-type runner in heat exchange fin 22 may include one
Layer, two layers or more, every layer is uniformly distributed more than ten to tens.The pressure hull 21, thermal fluid inlet pipeline 23 and hot-fluid
Body export pipeline 24 uses stainless steel or high-temperature alloy steel, and heat exchange fin 22 uses red copper material, and hot fluid is generally high temperature
Flue gas, high temperature air or high temperature heat conductive oil etc..
The heat transfer process of the hot end heat exchanger is as follows：
The L-type runner and engine interior that high temperature heat conductive oil enters in heat exchange fin 22 after thermal fluid inlet pipeline 23
Gases at high pressure working medium is exchanged heat, then through hot fluid outlet ports pipeline 24, so as to outflow heat exchanger, then after outside heat heats
Back flow back into thermal fluid inlet pipeline 25 and realize circulation loop.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of hot end heat exchanger for free piston stirling engine, it includes：
Pressure hull (21)；
Loaded on the heat exchange fin (22) in the pressure hull (21), hair is formed between pressure hull (21) and heat exchange fin (22)
Motivation expansion chamber (25)；
The thermal fluid inlet pipeline (23) being placed at the top of the pressure hull (21)；
The hot fluid outlet ports pipeline (24) being placed on the outside of the pressure hull (21)；
Characterized in that, runner (26) is set in heat exchange fin (22), entrance and the thermal fluid inlet of the runner (26)
Pipeline (23) is connected, and the outlet of the runner (26) is connected with the hot fluid outlet ports pipeline (24)；
The pressure hull (21) is in high temperature and high pressure environment, is made using stainless steel or high-temperature alloy material.
A kind of 2. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
The runner (26) is L-type runner.
A kind of 3. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
The runner (26) radially outwards sets some circles centered on the axial line of heat exchange fin (22).
A kind of 4. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
The heat exchange fin (22) is radially arranged.
A kind of 5. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
Fin is set inside the runner (26).
A kind of 6. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
It is to be interference fitted and ensured by way of welding between pressure hull (21) internal face and heat exchange fin (22) lateral surface
Contact strength.
A kind of 7. hot end heat exchanger for free piston stirling engine according to claim 1, it is characterised in that
The heat exchange fin (22) is made using red copper material, and the thermal fluid inlet pipeline (23) and hot fluid outlet ports pipeline (24) are equal
Made using high-temperature alloy or stainless steel.
8. a kind of free piston stirling engine, it is characterised in that it is any that the Stirling engine includes claim 1-7
Hot end heat exchanger described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610108454.XA CN105756804B (en) | 2016-02-26 | 2016-02-26 | A kind of hot end heat exchanger for free piston stirling engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610108454.XA CN105756804B (en) | 2016-02-26 | 2016-02-26 | A kind of hot end heat exchanger for free piston stirling engine |
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| CN105756804A CN105756804A (en) | 2016-07-13 |
| CN105756804B true CN105756804B (en) | 2017-12-12 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966062B (en) * | 2017-12-25 | 2024-02-23 | 陕西仙童科技有限公司 | Built-in water-cooling heat exchanger for acoustic energy free piston type machine |
| CN108825402B (en) * | 2018-07-16 | 2023-09-22 | 杨厚成 | Cold and hot end shell-and-tube heat exchange device for acoustic energy engine |
| CN114023469A (en) * | 2021-11-26 | 2022-02-08 | 上海齐耀动力技术有限公司 | Hot-gas engine heat exchanger for sodium-cooled fast reactor |
| CN114320656A (en) * | 2021-12-10 | 2022-04-12 | 兰州空间技术物理研究所 | Heater assembly applied to Stirling generator |
| CN115163327A (en) * | 2022-03-09 | 2022-10-11 | 长沙理工大学 | Device for improving heat exchange effect of external heat source of Stirling engine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6381958B1 (en) * | 1997-07-15 | 2002-05-07 | New Power Concepts Llc | Stirling engine thermal system improvements |
| US6694731B2 (en) * | 1997-07-15 | 2004-02-24 | Deka Products Limited Partnership | Stirling engine thermal system improvements |
| US6543215B2 (en) * | 2001-06-15 | 2003-04-08 | New Power Concepts Llc | Thermal improvements for an external combustion engine |
| JP4189855B2 (en) * | 2003-12-03 | 2008-12-03 | ツインバード工業株式会社 | Fin structure |
| JP3790252B2 (en) * | 2004-07-06 | 2006-06-28 | シャープ株式会社 | Heat exchanger and Stirling engine |
| US8474515B2 (en) * | 2009-01-16 | 2013-07-02 | Dana Canada Corporation | Finned cylindrical heat exchanger |
| CN104595056B (en) * | 2013-10-31 | 2017-05-17 | 北京精密机电控制设备研究所 | Cold end heat exchanger of free piston type Stirling engine |
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