CN104653331A - Free piston Stirling heat engine - Google Patents
Free piston Stirling heat engine Download PDFInfo
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- CN104653331A CN104653331A CN201510048156.1A CN201510048156A CN104653331A CN 104653331 A CN104653331 A CN 104653331A CN 201510048156 A CN201510048156 A CN 201510048156A CN 104653331 A CN104653331 A CN 104653331A
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- 239000010949 copper Substances 0.000 claims description 5
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- 238000013017 mechanical damping Methods 0.000 abstract description 5
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- 238000000034 method Methods 0.000 description 19
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- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- F02G1/0435—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 the engine being of the free piston type
-
- 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
- F02G1/055—Heaters or coolers
-
- 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)
- Fluid-Damping Devices (AREA)
Abstract
A free piston Stirling heat engine comprises a cylinder body, an ejector and a power piston which are arranged in the cylinder body, and a linear oscillating motor; the power piston consists of a piston plug body and a piston tenon portion, the piston plug body is arranged in the cylinder body, the piston tenon portion is connected with a motor rotor of the linear oscillation motor, an expansion cavity is formed between the discharger and the first end of the cylinder body, a compression cavity is formed between the discharger and the power piston, and a heat absorption end heat exchanger, a heat regenerator and a heat release end heat exchanger of a pipe bundle structure which is not in contact with the cylinder body are arranged in the circumferential space on the outer side of the cylinder body; the heat engine can ensure that the cylinder body at the outer side of the discharger is not extruded and deformed by the heat regenerator, and reduces the mechanical damping and air leakage loss of the discharger; meanwhile, the temperature of the room temperature side of the discharger can be effectively reduced, and the phenomenon that the discharger and the cylinder are clamped due to the increase of mechanical damping of the discharger caused by heat leakage and even the like is avoided; the high-temperature end heat exchanger, the heat regenerator and the room-temperature end heat exchanger are all in a small-diameter tube bundle structure, so that the material requirement and the manufacturing cost can be effectively reduced.
Description
Technical field
The present invention relates to thermal power technical field, particularly relate to a kind of free piston stirling heat engine.
Background technique
Free piston stirling heat engine is a kind of special structure form of thermo-acoustic engine, and it realizes the conversion between outside heat and mechanical energy by the efficient Stirling cycle of internal working medium.Adopt the free piston stirling engine of forward Stirling cycle by expanded by heating, meet cold compression and external heat is converted into mechanical energy; Adopt the free-piston Stirling cooler of reverse Stirling cycle by swelling heat absorption, heat is pumped to room temperature side from low temperature side by compression heat release, realizes refrigeration effect.No matter be motor or refrigerator, the theoretical efficiency of this kind of heat engine is all equal with Carnot efficiency.As a kind of thermo-acoustic engine, it realizes High Efficiency Thermal sound or sound hot-cast socket by sound field phase modulation, and realized and load by sound field resonance and sound field coupled modes---as the efficient coupling of linear electric motor etc., build free piston stirling generator or electric drive free-piston Stirling cooler.
Benefit from acoustic resonance characteristic, free piston stirling heat engine inner inorganic tool driving mechanism and oil lubrication device, thus there is vibration little, the simple and high reliability of structure; It adopts helium or nitrogen as working medium, has the feature of environmental protection; In addition, as a kind of external-burning type heat engine, it can adopt solar energy, industrial waste heat and biomass energy etc. as thermal source, has thermal source applicability wide, the advantage that comprehensive utilization of energy rate is high.Based on above feature, free piston stirling heat engine all has significant application prospect in solar electrical energy generation, the field such as cogeneration and subzero 80 DEG C and following warm area cryogenic refrigeration.
Although free piston stirling heat engine has a extensive future, still there is larger narrow limitation in conventional construction, becomes one of key factor of this heat engine large-scale application of restriction.Its narrow limitation is disclosed below in conjunction with structural representation and fundamental diagram.
Fig. 1 is existing free piston stirling heat engine structural representation, and it comprises with lower component: expansion chamber 1, heat absorbing end internal exchanger 2, heat absorbing end external heat exchanger 3, regenerator 4, cylinder body 5, release end of heat heat exchanger 6, compression chamber 7, power piston 8 (power piston cock body 8a, power piston falcon portion 8b), linear vibration motor 9 (electric mover 9b and motor stator 9a), planar support spring 10, motor back of the body chamber 11, discharger 12 (12a is the discharger body of rod), discharger cylinder 13.
Fig. 2 is existing free piston stirling engine working principle schematic diagram, and the parts in Fig. 2 are corresponding with Fig. 1.Referring to Fig. 1 and Fig. 2, for motor, the working principle of existing free piston stirling heat engine is as follows:
State a-state b process, power piston 8 is simultaneously up with discharger 12 from lower dead center, and gas is compressed in compression chamber 7, and by release end of heat heat exchanger 6 outwardly heat release.
State b-state c process, power piston 8 continues up, and discharger 12 is descending, and gas heat flows through regenerator 4 from compression chamber 7 and enters expansion chamber 1, way in by thermal release to regenerator 4, gas temperature reduce.
State c-state d process, gas, in expansion chamber 1, is expanded from external world's heat absorption by inner heat absorbing end heat exchanger 2 and outside heat absorbing end heat exchanger 3, make discharger 12 descending, and propulsion power piston 8 is descending.In this process, thermal power transfer is acoustic energy (mechanical energy) by regenerator 4, and by gas push power piston 8 the mover 9b cutting magnetic line of linear vibration motor 9 is outwardly exported with electrical energy form.
State d-state a process, power piston 8 continues descending, and discharger 12 is up, and gas heat flows through regenerator 4 from expansion chamber 1 and enters compression chamber 7, way in by thermal release to regenerator 4, regenerator 4 temperature raise, gas temperature reduce.
After completing an above-mentioned complete cycle process, thermal energy is mechanical energy by motor, and is driven the mover 9b cutting magnetic line of linear vibration motor by power piston 8, outwardly exported with electrical energy form.Power piston 8 and discharger 12 do simple harmonic oscillation, and the latter's phase place is ahead of the former.
Ideally, the heat of transformation of energy cannot be carried out (according to the second law of thermodynamics, generally be about 2 times ~ 3 times of generated energy) and static heat (being stayed to room-temperature zone from high-temperature zone by heat conduction, convection current and radiation mode) of leaking all should be taken away by release end of heat heat exchanger 6, thus ensure the work of ejector gaps sealed sides at room temperature.Under actual conditions, due to the restriction of structure and heat transfer boundary condition, above-mentioned two-part heat effectively cannot be taken away by release end of heat heat exchanger 6, this just causes heat accumulation in ejector gaps sealed sides, mechanical damping between discharger 12 and discharger cylinder 13 is increased, " stuck " phenomenon will be produced time serious and cannot work.
The working principle of the discharger 12 of free piston stirling heat engine can be expressed with following formula:
mx″＝P
1A
1-P
2A
2-Kx-Rx′
Wherein, m is discharger quality, and x is the displacement amount of discharger, the first derivative that x ' is displacement versus time and speed, x " be second dervative and the acceleration of displacement versus time, P
1and P
2be respectively discharger two ends and expansion chamber and compression chamber pressure, A
1and A
2then be respectively the cross-section area at discharger two ends, K is the elasticity coefficient of planar support spring 10, and R is damping constant.
Be not difficult to find out from this formula, P
1a
1-P
2a
2for the driving force of discharger motion, and once mechanical damping R is more than a threshold values, this resistance will exceed driving force and discharger cannot be worked.
On the other hand, be also not difficult to find out from Fig. 1, regenerator 4 adjoins discharger cylinder 13, and the packing of regenerator 4 is generally piles up silk screen, fibrofelt or random silk floss, and the discharger cylinder 13 then general thin-wall stainless steel that adopts leaks heat to reduce.In installation process, pile up that silk screen or random silk floss etc. are as easy as rolling off a log forms squeezing action to discharger cylinder 13, cause discharger cylinder 13 to be out of shape, thus cause serious air loss or enlarge markedly the mechanical damping of discharger 12.
Finally it is pointed out that the cylinder body 5 outside regenerator 4 and heat absorbing end internal exchanger 2 generally adopts thicker high-temperature alloy steel with the Security of guarantee system under High Temperature High Pressure internal environment.Engine power is larger, its cylinder body radial dimension and thickness larger, thus higher to the requirement of material and manufacturing process etc., become one of key factor of restriction free piston stirling engine high-power and scale application.
Above for free piston stirling engine, for free-piston Stirling cooler, also there is the problem of above-mentioned similar motor in the conventional construction shown in Fig. 1, comprising: discharger and discharger cylinder is stuck, the material of discharger cylinder deformation, cylinder body and manufacture process requirement harsh etc.
Summary of the invention
The object of the invention is to provide a kind of free piston stirling heat engine, to simplify release end of heat heat exchanger, regenerator and heat absorbing end heat exchanger structure, improve the reliability of system, to reduce the technology difficulty of system and manufacture cost, and discharger that above-mentioned free piston stirling heat engine exists can be overcome and the defect such as discharger cylinder is stuck, discharger cylinder deformation, cylinder body material and manufacture process requirement are harsh.
Technological scheme of the present invention is as follows:
The object of the invention is to provide a kind of free piston stirling heat engine, to simplify release end of heat heat exchanger, regenerator and heat absorbing end heat exchanger structure, improve the reliability of system, to reduce the technology difficulty of system and manufacture cost, and discharger that above-mentioned free piston stirling heat engine exists can be overcome and the defect such as discharger cylinder is stuck, discharger cylinder deformation, cylinder body material and manufacture process requirement are harsh.
Technological scheme of the present invention is as follows:
Free piston stirling heat engine provided by the invention, it comprises cylinder body, is located at the discharger in cylinder body and power piston, and linear vibration motor; Described power piston is made up of piston cock body and piston falcon portion, described piston cock body is located in described cylinder body, described piston falcon portion is connected with the electric mover of described linear vibration motor, expansion chamber is formed between described discharger and described cylinder body first end, compression chamber is formed between described discharger and described power piston, it is characterized in that, described cylinder body outer circumference space is furnished with and described cylinder body discontiguous Pipe bundle structure heat absorbing end heat exchanger, Pipe bundle structure regenerator and Pipe bundle structure release end of heat heat exchanger.
One end of the heat absorbing end heat exchanger of described Pipe bundle structure is connected with expansion chamber, and the other end is connected with regenerator.
Release end of heat heat exchanger one end of described Pipe bundle structure is connected with compression chamber, and the other end is connected with regenerator.
One end of the regenerator of described Pipe bundle structure is connected with heat absorbing end heat exchanger, and the other end is connected with release end of heat heat exchanger.
The regenerator of described Pipe bundle structure is restraining size with quantitatively identical or not identical again with the release end of heat heat exchanger of the heat absorbing end heat exchanger of Pipe bundle structure and Pipe bundle structure, and there is corresponding relation between above-mentioned three's Pipe bundle structure, namely the regenerator of a Pipe bundle structure is connected with the release end of heat heat exchanger of the heat absorbing end heat exchanger of one or more Pipe bundle structure and Pipe bundle structure.
Be provided with planar support spring between described linear vibration motor and described cylinder body second end, form motor between described planar support spring and described cylinder body second end and carry on the back chamber.
Described discharger is also provided with the discharger body of rod near power piston one end, and the described discharger body of rod inserts in the through hole arranged in described power piston.
The described discharger body of rod is fixedly connected with described planar support spring.
Described linear vibration motor and described power piston are symmetrical arranged along the described discharger body of rod.
The heat absorbing end heat exchanger of described Pipe bundle structure, the regenerator of Pipe bundle structure are or/and the outside of release end of heat heat exchanger of Pipe bundle structure is provided with fin; Described fin material is red copper or brass.
In of the present invention, during as motor, described heat absorbing end heat exchanger material can adopt high-temperature alloy steel or common stainless steel according to operation temperature area difference; During as refrigerator, described heat absorbing end heat exchanger 3 material can adopt red copper or stainless steel.
In the present invention, described release end of heat heat exchanger material is common stainless steel or red copper.
In the present invention, regenerator size and quantity can with heat absorbing end heat exchanger tube, release end of heat heat exchanger tube is identical or there are differences, its material is common stainless steel.
The advantage of free piston stirling heat engine provided by the invention is: by heat absorbing end heat exchanger, regenerator and release end of heat heat exchanger are arranged to the uniform Pipe bundle structure do not contacted with cylinder body of circumferencial direction, and in this Pipe bundle structure the pipe diameter of each parts much smaller than diameter of cylinder, thus effectively avoid the problem of discharger and the stuck and cylinder deformation of cylinder, reduce cylinder block material, manufacture process requirement and manufacture cost, add system reliability.Meanwhile, free piston stirling heat engine provided by the invention, the flow field in regenerator, heat absorbing end heat exchanger and release end of heat heat exchanger evenly, flowing is more level and smooth, and effectively can suppress the acoustic streaming that formed because structure is asymmetric etc., thus elevator system performance.
Accompanying drawing explanation
Fig. 1 is existing free piston stirling heat engine structural representation;
Fig. 2 is existing free piston stirling heat engine (motor) working principle schematic diagram;
Fig. 3 is the free piston stirling heat engine structural representation that one embodiment of the invention provides;
Fig. 4 is free piston stirling heat engine (motor) the working principle schematic diagram shown in Fig. 3;
Fig. 5 is the structural representation of a kind of heat absorbing end heat exchanger of the present invention and release end of heat heat exchanger.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, further describe the present invention below in conjunction with drawings and Examples; Obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 3 is the structural representation of the free piston stirling heat engine that one embodiment of the invention provides, and parts identical in Fig. 3 with Fig. 1 adopt identical label.As shown in Figure 3, the free piston stirling heat engine that the present embodiment provides comprises: cylinder body 5, linear vibration motor 9, is located at power piston 8 in cylinder body 5 and discharger 12; Power piston 8 comprises cock body 8a and falcon portion 8b, cock body 8a are located in cylinder body 5, and falcon portion 8b is connected with the mover 9b of linear vibration motor 9; Form expansion chamber 1 between discharger 12 and cylinder body 5 first end, between discharger 12 and power piston 8, form compression chamber 7.
Concrete, the heat absorbing end heat exchanger 3 of the free piston stirling heat engine that the present embodiment provides is Pipe bundle structure, preferably, can in being evenly arranged on cylinder body 5 external circumferential direction, be understandable that, for strengthening heat transfer effect, multilayer fin structure can also be increased to increase heat exchange area in this tube bank outer wall; Heat absorbing end heat exchanger 3 is restrained one end and is connected with expansion chamber 1, and the other end is then connected with regenerator 4.
The release end of heat heat exchanger 6 of the free piston stirling heat engine that the present embodiment provides is Pipe bundle structure, preferably, its on cylinder body 5 external circumferential direction in being evenly arranged, be understandable that, for strengthening heat transfer effect, multilayer fin structure can also be increased to increase heat exchange area in this tube bank outer wall; Release end of heat heat exchanger 6 is restrained one end and is connected with compression chamber 7, and the other end is connected with regenerator 4.
The regenerator 4 of the free piston stirling heat engine that the present embodiment provides is Pipe bundle structure, preferably, its in cylinder body 5 external circumferential direction also in being evenly arranged; Regenerator 4 one end is connected with heat absorbing end heat exchanger 3, and the other end is connected with release end of heat heat exchanger 6, and silk screen, fibrofelt or the random silk floss that interior filling stratiform is piled up restrained by regenerator 4.
Discharger 12 is also provided with discharger body of rod 12a near power piston 8 one end, and discharger body of rod 12a inserts in the through hole arranged in power piston 8.Linear vibration motor 9 comprises stator 9a and mover 9b, and concrete form the present embodiment of linear vibration motor 9 does not impose any restrictions, and can adopt moving-magnetic type, moving-iron type, also can adopt moving coil.
The specified structure of working principle to free piston stirling heat engine provided by the invention below in conjunction with free piston stirling heat engine is further expalined explanation.Hereafter for the working principle of motor, refrigerator is the inverse circulation of motor.Fig. 4 is the free piston stirling engine working principle schematic diagram shown in Fig. 3.Simultaneously with reference to Fig. 3 and Fig. 4, the working principle of the free piston stirling engine that the present embodiment provides is as follows:
State a-state b process, power piston 8 is simultaneously up with discharger 12 from lower dead center, and gas is compressed compression chamber 7 in, and by release end of heat heat exchanger 6 outwardly heat release, and this heat is through the air of release end of heat heat exchanger 6 tube bank or water-band is walked.
State b-state c process, power piston 8 continues up, and discharger 12 is descending, and gas heat flows through regenerator 4 from compression chamber 7 and enters expansion chamber 1, way in by thermal release to regenerator 4, gas temperature reduce.
State c-state d process, gas, in expansion chamber 1, is expanded from external world's heat absorption by heat absorbing end heat exchanger 3, make discharger 12 descending, and propulsion power piston 8 is descending.In this process, thermal power transfer is acoustic energy (mechanical energy) by regenerator 4, and by gas push power piston 8 the mover 9b cutting magnetic line of linear vibration motor 9 is outwardly exported with electrical energy form.
State d-state a process, power piston 8 continues descending, and discharger 12 is up, and gas heat flows through regenerator 4 from expansion chamber 1 and enters compression chamber 7, way in by thermal release to regenerator 4, regenerator 4 temperature raise, gas temperature reduce.
After completing an above-mentioned complete cycle process, heat energy is converted into mechanical energy, and by power piston 8 drive motor mover 9b cutting magnetic line, outwardly export with electrical energy form.Power piston 9 and discharger 12 do simple harmonic oscillation, and the latter's phase place is ahead of the former.Discharger in the free piston stirling heat engine that the present embodiment provides is identical with power piston with the discharger of existing free piston stirling heat engine with power piston working mechanism.But the structural design of the free piston stirling heat engine that the present embodiment provides and process characteristic and prior art have bigger difference.
The free piston stirling heat engine provided by the present embodiment, its regenerator 4 unconventional loop configuration, to be arranged in outside cylinder body 5 and to contact with cylinder body 5, but Pipe bundle structure, namely regenerator 4 forms to up to a hundred pipes by tens, to be evenly arranged in the circuferential spacing outside cylinder body 5 and not to contact with cylinder body 5.Adopt the regenerator 4 that pipe with small pipe diameter pipe is formed, its Security comparatively prior art significantly improves.
Free piston stirling heat engine inside is high-pressure helium or nitrogen, and gas pressure is generally 2MPa ~ 20MPa, is safe operation, and the thickness of each parts should meet requirement of withstand voltage.Especially, the stress of the pipe at regenerator 4 place can be expressed with following formula:
Wherein, P is gas pressure in cylinder, and D is cylinder internal diameter, and δ is cylindrical shell thickness, σ
tfor the allowable stress of cylinder material under design temperature.Be not difficult to find out from this representation, the internal diameter of cylindrical shell is less, then the stress of cylindrical shell is less, more can ensure the Security of overpressure resistant barrel.
Can be found out by above-mentioned withstand voltage principle, the free piston stirling heat engine that the present embodiment provides, build regenerator by minor diameter tube bank, fully can ensure the Security of heat engine, promote the reliability of heat engine.Meanwhile, its cost of material and difficulty of processing all can significantly reduce.
It should be noted that, regenerator 4 tube bank is placed in cylinder body 5 external circumferential space, but it does not contact with cylinder body 5.Compared to existing technology, the free piston stirling heat engine that the present embodiment provides, regenerator 4 can not produce squeezing action to cylinder body 5, cylinder body 5 thus can not be caused to be out of shape and discharger 12 and the serious phenomenon such as cylinder body 5 is stuck.
The free piston stirling heat engine provided by the present embodiment, its heat absorbing end heat exchanger 3 and release end of heat heat exchanger 6 all adopt Pipe bundle structure.Heat absorbing end heat exchanger 3, regenerator 4 can be identical or not identical with size with the tube bank quantity of release end of heat heat exchanger 6, but this three exists corresponding relation, namely the regenerator of a Pipe bundle structure is connected with the release end of heat heat exchanger of the heat absorbing end heat exchanger of one or more Pipe bundle structure and Pipe bundle structure; With reference to Fig. 3, in this figure, a regenerator pipe is connected with a heat absorbing end heat exchanger pipe and a release end of heat heat exchanger pipe, and namely 111 is corresponding; But, also can so arrange: two heat absorbing end heat exchanger pipes, two release end of heat heat exchanger pipes, be connected with a regenerator pipe, i.e. 212 combinations, this combining form is very many, such as 313 combinations, 414 combinations etc., this must be determined by embody rule occasion.Compared to existing technology, this method for arranging can ensure that flowing in each regenerator and heat exchanger tube is more level and smooth, and flow field is more even, the heat loss etc. reducing flow losses because irregular flowing causes and cause because of acoustic streaming.
As a kind of preferred implementation of the present embodiment, linear vibration motor 9 in free piston stirling heat engine and be also provided with planar support spring 10 between cylinder body 5 second end, form motor between planar support spring 10 and cylinder body 5 the other end and carry on the back chamber 11, discharger body of rod 12a is fixedly connected with planar support spring 10.Linear vibration motor 9 and power piston 8 are symmetrical arranged along discharger body of rod 12a.Because the radial rigidity of planar support spring 10 is much larger than axial rigidity, thus it can not only retrain the radial displacement of discharger 12, prevent serious frictional loss, discharger 12 can be made again to have larger displacement (relatively radial) in the axial direction, complete compression and the expansion of gas.
As a kind of preferred implementation, the inner filling porous material of the regenerator 4 in the present embodiment can be such as Stainless Steel Cloth, Stainless Steel Fibre felt or the random silk floss of stainless steel.Discharger 12 can be uniform section or the hollow closed circular columniation structure of variable cross section, and material can select stainless steel, and cylinder is thinner to reduce axial heat conduction loss.Discharger 12 adopts clearance seal with the wall of cylinder 5, to reduce collaborating and leakage thermal loss between expansion chamber 1 and compression chamber 7.
The optional mode of execution of one as above-described embodiment, can also optimize heat exchanger structure.Fig. 5 is the heat exchanger schematic diagram that one embodiment of the invention provides, and parts identical in Fig. 5 with Fig. 3 adopt identical label.As shown in Figure 5, the free piston stirling heat engine that the present embodiment provides, concrete can increase heat-exchange fin 14 significantly to increase heat exchange area by restraining outer surface in heat absorbing end heat exchanger 3 tube bank and release end of heat heat exchanger 6, and fin adopts red copper or brass to be that material is to promote heat-conducting property.The free piston stirling heat engine that the present embodiment provides may be used for some specific operations.
Based on above-mentioned, free piston stirling heat engine provided by the invention, its heat absorbing end heat exchanger 3, regenerator 4 and release end of heat heat exchanger 6 all adopt Pipe bundle structure, evenly, the circuferential spacing outside heat engine cylinder body 5 is arranged in non-contactly, and there is corresponding relation in the tube bank of three, not only be conducive to elevator system performance and specific power, and the reliability effectively reducing manufacture cost, simplify system architecture, add system.
Last it is noted that above each embodiment is only in order to illustrate technological scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristics; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technological scheme.
Claims (10)
1. a free piston stirling heat engine, it comprises cylinder body, is located at the discharger in cylinder body and power piston, and linear vibration motor; Described power piston is made up of piston cock body and piston falcon portion, described piston cock body is located in described cylinder body, described piston falcon portion is connected with the electric mover of described linear vibration motor, expansion chamber is formed between described discharger and described cylinder body first end, compression chamber is formed between described discharger and described power piston, it is characterized in that, described cylinder body outer circumference space is furnished with and described cylinder body discontiguous Pipe bundle structure heat absorbing end heat exchanger, Pipe bundle structure regenerator and Pipe bundle structure release end of heat heat exchanger.
2., by free piston stirling heat engine according to claim 1, it is characterized in that, one end of the heat absorbing end heat exchanger of described Pipe bundle structure is connected with expansion chamber, and the other end is connected with regenerator.
3., by free piston stirling heat engine according to claim 1, it is characterized in that, release end of heat heat exchanger one end of described Pipe bundle structure is connected with compression chamber, and the other end is connected with regenerator.
4. free piston stirling heat engine according to claim 1, is characterized in that, one end of the regenerator of described Pipe bundle structure is connected with heat absorbing end heat exchanger, and the other end is connected with release end of heat heat exchanger.
5. by free piston stirling heat engine according to claim 1, it is characterized in that, the regenerator of described Pipe bundle structure is restraining size with quantitatively identical or not identical again with the release end of heat heat exchanger of the heat absorbing end heat exchanger of Pipe bundle structure and Pipe bundle structure, and there is corresponding relation between above-mentioned three's Pipe bundle structure, namely the regenerator of a Pipe bundle structure is connected with the release end of heat heat exchanger of the heat absorbing end heat exchanger of one or more Pipe bundle structure and Pipe bundle structure.
6., by free piston stirling heat engine according to claim 1, it is characterized in that, between described linear vibration motor and described cylinder body second end, be provided with planar support spring, form motor between described planar support spring and described cylinder body second end and carry on the back chamber.
7., by free piston stirling heat engine according to claim 1, it is characterized in that, described discharger is also provided with the discharger body of rod near power piston one end, and the described discharger body of rod inserts in the through hole arranged in described power piston.
8., by free piston stirling heat engine according to claim 7, it is characterized in that, the described discharger body of rod is fixedly connected with described planar support spring.
9. free piston stirling heat engine according to claim 1, is characterized in that, described linear vibration motor and described power piston are symmetrical arranged along the described discharger body of rod.
10. free piston stirling heat engine according to claim 1, is characterized in that, the heat absorbing end heat exchanger of described Pipe bundle structure, the regenerator of Pipe bundle structure are or/and the outside of release end of heat heat exchanger of Pipe bundle structure is provided with fin; Described fin material is red copper or brass.
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| CN201510048156.1A CN104653331A (en) | 2015-01-29 | 2015-01-29 | Free piston Stirling heat engine |
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| CN201510048156.1A CN104653331A (en) | 2015-01-29 | 2015-01-29 | Free piston Stirling heat engine |
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| CN104964580A (en) * | 2015-06-19 | 2015-10-07 | 中国科学院理化技术研究所 | Tube bundle heat exchanger |
| CN106884735A (en) * | 2017-02-09 | 2017-06-23 | 中国科学院理化技术研究所 | Combined cooling and power system |
| CN112303953A (en) * | 2020-07-28 | 2021-02-02 | 中国科学院理化技术研究所 | Waste heat driven refrigerator |
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