CN203321698U - Stirling circulation engine - Google Patents

Abstract

The utility model provides a Stirling circulation engine which can reduce friction inside a cylinder and can simultaneously inhibit reduction of mechanical accuracy due to deformation of a lower part at the high temperature. Basic parts (71 and 21) of a displacer (70) or a piston (20) are made of metal, and slide parts (72, 23 and 24) are made of resin. Therefore, compared with conditions that the basic parts (71 and 21) are made of resin, the thermal deformation can be reduced, and the reduction of the mechanical accuracy of the displacer (70) and the piston (20) at the high temperature can be inhibited; and besides, by means of the resin slide parts (72, 23 and 24) on the outer surfaces of the basic parts (71 and 21), the sliding friction inside the cylinder can be inhibited to be lower.

Description

Stirling cylic engine

Technical field

The utility model relates to a kind of Stirling that utilizes and loops generating, cooling etc. Stirling cylic engine.

Background technique

In the past, have the Stirling cylic engine that makes displacer (Displacer) and piston coaxially be disposed at the structure in cylinder and be widely known by the people, it comes practical as generator or refrigerating machine etc.Generally, in such Stirling cylic engine, permanent magnet is installed in piston, in the mode that clips its permanent magnet, disposes stator and yoke.In the occasion of generator, utilize the temperature official post working gas give from outside to repeat to occur compression and expansion, make thus reciprocating motion of the pistons, the electromagnetic action of its energy utilized permanent magnet and stator and be transformed to electric energy.On the other hand, in the occasion of refrigerating machine, driving current is flowed in the electromagnetic coil of stator, make thus reciprocating motion of the pistons, along with its to-and-fro motion, make working gas that compression and expansion occur repeatedly, produced the temperature difference between low-temp. portion and high-temperature portion for this reason.

In Stirling cylic engine, displacer piston is in cylinder during to-and-fro motion, and both cause damage in friction.In the past, implemented the coating of the low frictions such as fluororesin by the internal surface of the outer surface in displacer piston or cylinder, to realize reducing frictional loss.But, such as requiring to have than the durability under higher temperatures in generator etc., thereby, exist through the coating such as fluororesin and heat resistance, the inadequate situation of wearability.

Polyphenylene sulfide) etc. on the other hand, in resin material, such as PPS(polyphenylene sulfide: its frictional property is low and rigidity is high like that, and heat resistance or wearability are also more excellent than fluor resin coating.But it is larger that resin material and metal etc. are compared the amount of deformation usually be heated, for this reason, in the situation that by resin material the base material as displacer or piston, occurred at high temperature can't reaching the problem of the mechanical precision of expectation.

The model utility content

The technical problem of the required solution of the utility model is: how to realize a kind of minimizing that realizes friction in cylinder, can suppress the Stirling cylic engine that the distortion of high-temperature lower part part causes mechanical precision to reduce simultaneously.

For solving the problems of the technologies described above, the technological means that the utility model adopts is: the utility model provides a kind of Stirling cylic engine, and it has: be fixed in the cylinder in housing; Be inserted in described cylinder one end and can reciprocating displacer; And be inserted in the described cylinder the other end and can reciprocating piston.In described displacer and described piston, at least one comprises: the base portion formed by metal; And formed by resin, be arranged on the outer surface of described base portion and the slide part that can slide along described cylinder surfaces.

Preferably, described base portion and described slide part are shaped and form as one by embedding.

Preferably, described slide part has the ring-type slip surface of the whole circumference of described base portion of the circular cross-section of surrounding.

Preferably, described Stirling cylic engine has: be fixed in the stator in described housing; Be arranged at the described base portion of described piston, be applied to the magnet in the magnetic field on described stator with generation.Separately be provided with two described slide parts on the described base portion of described piston.Described magnet is arranged between described two slide parts in the form of a ring in the mode of surrounding the whole circumference of described base portion cylindraceous.

Preferably, described base portion has and forms the groove that bottom width is greater than the opening portion width.To be used to form the resin filling of described slide part in the described groove of described base portion.

Preferably, described Stirling cylic engine has: in the face of the expansion chamber of described displacer one end; Pressing chamber in the face of described displacer the other end; For being communicated with the gas flow path between described expansion chamber and described pressing chamber; For accumulating the heat exchanger of heat of the working gas that circulates in described gas flow path.The described base portion of described displacer is arranged on the described the other end in the face of described pressing chamber.

Preferably, described displacer has head, and described head is formed by the material with adiabaticity, and is arranged at the described end in the face of described expansion chamber.

Preferably, described pressing chamber is formed between the described base portion of the described base portion of described displacer and described piston.

Compared with prior art, the effect that the utility model brings: according to the utility model, can provide a kind of minimizing that realizes friction in cylinder, can suppress the distortion of high-temperature lower part part simultaneously and cause the Stirling cylic engine of the reduction of mechanical precision.

The accompanying drawing explanation

Fig. 1 means the sectional view of an example of Stirling cylic engine structure of the utility model one mode of execution.

Fig. 2 is the displacer in the Stirling circulator Central Shanxi Plain shown in graphic representation Fig. 1 and the major component figure of piston.

Fig. 3 means that the displacer in the Stirling cylic engine shown in Fig. 1 drives the figure with bar.

Description of reference numerals: 1 ... housing, 2 ... upper body, 3 ... the intermediate portion housing, 5 ... the cylinder holding part, 6 ... outside fin, 7 ... lower case, 8 ... cap, 10 ... upper cylinder, 11 ... lower cylinder, 12 ... expansion chamber, 13 ... heat absorbing fins, 14 ... heat exchanger (thermal accumulator), 15 ... radiating fin, 16 ... intercommunicating pore, 17 ... pressing chamber, 18 ... yoke, 20 ... piston, 21 ... base portion, 22 ... breakthrough part, 23, 24 ... slide part, 25 ... magnet, 30 ... stator, 33 ... coil, 36 ... iron core, 40 ... support, 41 ... pillar, 43 ... the supporting base station, 51, 52 ... spring component, 61, 62 ... bar, 70 ... displacer, 71 ... base portion, 72 ... slide part, 73 ... head.

Embodiment

Be example in conjunction with Fig. 1 to Fig. 3 and the Stirling cylic engine that is applicable to generator, illustrate the Stirling cylic engine of a kind of better embodiment of the utility model.

Fig. 1 means the sectional view of an example of Stirling cylic engine structure of the utility model one mode of execution.In addition, Fig. 2 is the figure of the major component of displacer in the Stirling cylic engine shown in graphic representation Fig. 1 and piston.

Stirling cylic engine shown in Fig. 1 has: housing 1; Be contained in upper cylinder 10 and lower cylinder 11 in housing 1; Be inserted in upper cylinder 10 and can reciprocating displacer 70; Be inserted in lower cylinder 11 and can reciprocating piston 20; Inboard outside arranged opposite stator 30 and the yoke 18 of piston 20; Be installed on the magnet 25 in the cylindrical wall section of piston 20; To displacer 70 force application spring members (resilient member) 51; Spring component (resilient member) 52 to piston 20 application of forces.

At this, housing 1 is the example of housing in the utility model, upper cylinder 10 and lower cylinder 11 are the example of cylinder in the utility model, displacer 70 is the example of displacer in the utility model, piston 20 is the example of piston in the utility model, stator 30 is the example of stator in the utility model, and magnet 25 is the example of magnet in the utility model.

Housing 1 is the seal container of the working gas (helium etc.) for sealing Stirling cylic engine.In Fig. 1 example, housing 1 is combined to form by upper body 2, intermediate portion housing 3, cylinder holding part 5 and lower case 7.

Upper body 2 and intermediate portion housing 3 have formed the cylindrical inner space that is mainly used in holding upper cylinder 10.The inwall of the top board side of upper cylinder 10 is arcuation and band circular arc.The periphery butt of cylinder holding part 5 its inwalls and lower cylinder 11, and keeping lower cylinder 11 with centre of location axle position.

Lower case 7 has formed the cylindrical inner space that mainly accommodates lower cylinder 11, stator 30, yoke 18 and spring component 51,52.Be provided with supporting base station 43 near the bottom of lower case 7, supporting base station 43 from side bearing mechanism's (upper cylinder 10, lower cylinder 11 etc.) integral body in housing 1.Central authorities in the bottom of lower case 7 are provided with opening portion, and its opening portion is by cap 8 sealings.Cap 8 has for working gas being imported to housing 1 inside, or break-through has the not shown pipe of electric wiring.

Upper cylinder 10 and lower cylinder 11 have respectively cylindrical shape, and each central shaft is disposed in housing 1 alignedly.In the situation that upper cylinder 10 and lower cylinder 11 are considered as to a cylinder, displacer 70 is inserted in the upside of this cylinder and can to-and-fro motion, and piston 20 is inserted in the lower side of this cylinder and can to-and-fro motion.Upper cylinder 10 and lower cylinder 11 can be linked and be formed by minute body component, also can form as one.

Lower cylinder 11 is fixed on supporting base station 43 through a plurality of pillars 41.In Fig. 1 example, pillar 41 forms tubular, and bolt 42 has connected hole and the tubular pillar 41 that is arranged at supporting base station 43.The female screw thread of the male screw thread of the front end by making bolt 42 and the lower surface of lower cylinder 11 is screwed, and lower cylinder 11 is fixed on supporting base station 43.Spring component 51 has the hole connected for bolt 42, and it is clamped and fixed between pillar 41 and supporting base station 43.In Fig. 1 example, three flat spring members 51 are fixed on supporting base station 43.

To be formed at the upper surface of displacer 70 and the space between housing 1 as expansion chamber 12, at this, working gas heating and its volume are increased.On the other hand, a small handdrum with beads striking when rotated is formed at space between displacer 70 and piston 20 as pressing chamber 17, at this, cooling and its volume of working gas is reduced.

Surround the cylindric space that upper cylinder 10 outer walls and housing 1 inwall form, form the working gas stream (gas flow path) that expansion chamber 12 is communicated with pressing chamber 17.Be provided with the intercommunicating pore 16 be connected with pressing chamber 17 between upper cylinder 10 and lower cylinder 11.This intercommunicating pore 16 is communicated with described cylindric space (gas flow path), expansion chamber 12 is communicated with pressing chamber 17.

Dispose heat absorbing fins 13, heat exchanger (regenerator) 14 and radiating fin 15 in described cylindric space (gas flow path).Heat absorbing fins 13 is disposed at the position near upside expansion chamber 12, and radiating fin 15 is disposed at the position near downside pressing chamber 17, and heat exchanger 14 is disposed between heat absorbing fins 13 and radiating fin 15.Heat exchanger 14 seizes from expansion chamber 12 and flows to the heat of working gas of pressing chamber 17 and accumulation of heat, and the working gas had flow to expansion chamber 12 from pressing chamber 17 applies the function that this accumulates heat.

Housing 1 has outside fin 6 on the part of joining with radiating fin 15.Outside fin 6 is as the cooling mechanism for by the heat of working gas discharge housing 1 outside.In Fig. 1 example, on outside fin 6 is fixed between intermediate portion housing 3 and cylinder holding part 5.Outside fin 6 is utilized and is supplied with cooling medium (water etc.) such as illustrated pump never etc. and come coolingly, and is retained to predetermined temperature.

On the other hand, upper body 2 becomes the heat-absorbing body that heat for being supplied with by external heat source passes to the working gas of expansion chamber 12, and on the inwall of upper body 2, butt has heat absorbing fins 13.

Displacer 70 comprises: be arranged in the face of the head 73 on an end of expansion chamber 12; Be arranged in the face of the base portion 71 on the other end of pressing chamber 17; The slide part 72 slided along upper cylinder 10 internal surfaces; And cylindrical body 74.

Head 73 is the example of head in the utility model, and base portion 71 is the example of base portion in the utility model, and slide part 72 is the example of slide part in the utility model.

Head 73 forms the wall that is useful on zoning expansion chamber 12.Head 73 is formed by the resin such as having adiabaticity (PPS etc.), for blocking from expansion chamber 12 to pressing chamber 17 heat conduction.

Base portion 71 forms the wall that is useful on zoning pressing chamber 17.Base portion 71 is by forming such as metals such as aluminium brasss, for keeping head 73 and slide part 72.Base portion 71 is formed by metal, with situation about being formed by resin etc., compares, and has reduced the part distortion amount that Yin Wendu causes.Therefore, suppressed the reduction of mechanical precision under high temperature.

Slide part 72 is arranged at the outer surface of base portion 71 and slides along the internal surface of upper cylinder 10, and has the ring-type slip surface of the base portion 71 whole circumference of the circular cross-section of surrounding.Slide part 72 is formed by the resin such as the tool low frictional properties such as PPS and heat resistance and excellent in wear resistance.

This slide part 72 and base portion 71 are shaped and form as one by embedding.Particularly, the base portion 71 that for example will make is in advance inserted in predetermined mould, by making it solidify in its mould of resin injection, makes thus base portion 71 and slide part 72 form as one.As shown in the left side enlarged view in Fig. 2, base portion 71 has the groove 75 for fastening slide part 72.The bottom width of groove 75 is greater than the width of opening portion.When the resin that is used to form slide part 72 occurs to solidify with the state in being filled in this groove 75, the resin of groove 75 inside can not come off from the opening portion of groove 75.Thus, base portion 71 is joined together with slide part 72 strongly.

Form as one through embedding by base portion 71 and slide part 72, and do not need for the mechanism components in conjunction with these parts, also without assembling operation.Thus, need not consider the degree of difficulty of assembling operation etc., and can make as far as possible slide part 72 attenuation, therefore, can make the use amount of the resin that heat distortion amount the is many inferior limit that becomes.

In addition, as shown in the enlarged view in the left side of Fig. 2, the edge 101 of the slip surface of slide part 72 is smoothly to the direction bending of leaving upper cylinder 10 internal surfaces.When the interior displacer 70 of upper cylinder 10 pumps, working gas easily from this crooked edge 101 along slip surface, flow swimmingly, the gap between slide part 72 slip surfaces and upper cylinder 10 internal surfaces is formed with the working gas layer.This working gas layer has been brought into play the gas lubrication function, and makes the slip surface of slide part 72 be difficult to directly contact with the internal surface of upper cylinder 10, therefore, can significantly reduce the friction in upper cylinder 10.

On the end wall of pressing chamber 17 sides of base portion 71, be fixed with the cylindrical body 74 that and diameter coaxial with base portion 71 is less than base portion 71.In Fig. 1 example, be formed with circular depressions at the central part of the end wall of base portion 71, be inserted with the upper end of cylindrical body 74 in this recess.

The bar 61 that displacer 70 extends through the parallel to an axis ground with cylinder (10,11) is connected with spring component 51.One end of bar 61 is connected with base portion 71 through the cavity of the cylindrical body 74 of displacer 70.The other end of bar 61 is connected with the plate-shaped springs member 51 on the supporting base station 43 that is installed on lower case 7.Displacer 70, under the resilient force of the spring component 51 connected through bar 61, is subject to the application of force of above-below direction (cylinder axially).

Fig. 3 means the figure of the bar 61 in the Stirling cylic engine shown in Fig. 1.As shown in the drawing, the diameter of bar 61 is 65,66 thick (D2, D3) in end, and at central part 64 thin (D1).The diameter of central part 64 certain (D1), the slowly chap of diameter D1 along with causing end closely of the diameter of end 65,66.The thin footpath D1 of central part 64 is set as, is subject to spring component 51 active forces and can makes central part 64 that the value of the such degree of resiliently deformable occurs in the reciprocating process of displacer 70.

Because resiliently deformable can occur bar 61, therefore, even the central shaft of the central shaft of displacer 70 and upper cylinder 10 more or less is offset, bar 61 is at central part 64 also flexibly deflection, and displacer 70 is in the interior easily to-and-fro motion swimmingly of upper cylinder 10.That is, suppressed to increase because of displacer 70 friction that strongly butt upper cylinder 10 parts cause.

Piston 20 possesses: the base portion 21 with drum of an end sealing; And be arranged at the slide part 23,24 on base portion 21 outer surfaces.Base portion 21 is the example of base portion in the utility model, and slide part 23,24 is the example of slide part in the utility model.

Base portion 21 is facing to displacer 70 on the end wall be closed, and this end wall has formed the wall for zoning pressing chamber 17.Base portion 21 is formed by metals such as aluminium or brass, to keep slide part 23,24.Because base portion 21 is formed by metal, with situation about being formed by resin etc., compare, can reduce the part distortion amount that Yin Wendu causes, therefore, suppressed the reduction of mechanical precision under high temperature.

Slide part 23,24 is arranged on the outer surface of base portion 21 dividually, and slides along the internal surface of lower cylinder 11, and has respectively the ring-type slip surface of the base portion 21 whole circumference that surround on cylinder.Slide part 23,24 is formed by the resin such as the low frictional properties such as PPS and heat resistance and excellent in wear resistance.

This slide part 23,24 and base portion 21 are same with previously described base portion 71 and slide part 72, by embedding, are shaped and form as one.In addition, as shown in the enlarged view in the left side in Fig. 2, base portion 21 has the groove 27,28 for fastening slide part 23,24.The width of groove 27,28 bottoms is greater than the width of opening portion, and therefore, when the resin that is used to form slide part 23,24 solidifies with the state in being filled in this groove 27,27, the resin of groove 75 inside can not come off from the opening portion of groove 75 yet.Thus, base portion 21 is joined together with slide part 23,24 strongly.

Base portion 21 is shaped and forms as one by embedding with slide part 23,24, can make thus the use amount of the resin that heat distortion amount is many become inferior limit.

In addition, as shown in the left side enlarged view in Fig. 2, the edge 102,103 of the slip surface of slide part 23,24 is smoothly crooked to the direction of leaving from lower cylinder 11 internal surfaces.Thus, same with the situation of above-mentioned slide part 72, be formed with the working gas layer in the gap between the internal surface of the slip surface of slide part 23,24 and lower cylinder 11, thereby significantly reduced the friction in lower cylinder 11.

In the end wall central authorities in the face of the base portion 21 of displacer 70, be formed with the breakthrough part 22 that the cylindrical body 74 for displacer 70 holds.In Fig. 1 example, this breakthrough part 22 is cylindricly and extends with cylinder (10,11) parallel to an axis.The cylindrical body 74 break-through breakthrough parts 22 of displacer 70 and pumping.

Many the bars 62 that the base portion 21 of piston 20 extends through the parallel to an axis ground with cylinder (10,11), be connected with plate-shaped springs member 52.In Fig. 1 example, spring component 52 is disposed between lower cylinder 11 and spring component 51, and is fixed on lower cylinder 11(or supporting base station 43 through not shown pillar) on.Central part at spring component 52 forms the through hole for bar 61 break-through.A plurality of bar 62 one ends be connected to breakthrough part 22 around on symmetrical position, the other end be connected to spring component 52 described through hole around on symmetrical position.

Bar 62 and previously described bar 61(Fig. 3 of the driving use of piston 20) same, in end, its diameter is thicker, thinner at its diameter of central part.The central part of bar 62 has certain thin diameter of degree like that, makes in the reciprocating process of piston 20, can under spring component 52 effects, resiliently deformable occur.Because bar 62 can produce resiliently deformable, therefore, even the central shaft of the central shaft of piston 20 and lower cylinder 11 does not more or less line up, bar 62 also can be flexibly crooked at central part, at lower cylinder 11 inner carriers 20 also easily to-and-fro motion swimmingly.That is, suppressed to cause friction to increase because piston 20 strongly abuts to lower cylinder 11 parts.

Be fixed with magnet 25 on the base portion 21 of piston 20.Magnet 25 is arranged between the slide part 23,24 of separating in the form of a ring in the mode that surrounds cylindric base portion 21 whole circumference.Be fixed with yoke 18 on the internal surface of the lower cylinder 11 in the face of magnet 25.Yoke 18 consists of magnetic materials such as iron, and forms for example ring-type in the mode of surrounding magnet 25.At the base portion 21 of piston 20 inboard and with the opposed position of yoke 18 on dispose stator 30.Magnet 25 is clamped between stator 30 and yoke 18, and pumps together with piston 20.Magnet 25 has produced the magnetic field acted on stator 30 and yoke 18.

Stator 30 has: by electric wire, be wound as ring-type and the coil 33 that forms; And across coil 33 and the opposed iron core 36 of yoke 18.

Coil 33 is configured in the inboard of the cylindric base portion 21 of piston 20.In addition, coil 33 coaxially configures with piston 20, so that the magnet 25 of its outer circumferential side and piston 20 is faced.

Iron core 36 forms the shape of surrounding around the cross section of the coil vertical with the wire intertwist direction 33, and the part of facing at magnet 25 and coil 33 has gap (surrounding coil 33 part in addition, gap).In the example of Fig. 1, iron core 36 is divided into two block (36A, 36B) symmetrical on above-below direction.Overlapping bonding by the plate of magnetic material by thin (silicon steel plate etc.), form respectively upper and lower two block (36A, 36B).

Iron core 36 is clipped by two plate parallel circle discoid plate members, and this tabular component is fixed on support 40 by not shown connection piece.Support 40 is fixed on housing 1 jointly with lower cylinder 11.

At this, the action of Stirling cylic engine with above-mentioned formation is described.

Displacer 70 to piston 20 towards below while moving, pressing chamber 17 narrows down, the working gas of pressing chamber 17 flow through intercommunicating pore 16, radiating fin 15, heat exchanger 14 and heat absorbing fins 13, and flow in the expansion chamber 12 of high temperature.Flow into the working gas heating in expansion chamber 12 and make volumetric expansion, thereby improved the pressure of expansion chamber 12 and pressing chamber 17.At the pressure of expansion chamber 12 and pressing chamber 17, during higher than the pressure in the back pressure space 9 of the lower case 7 become by piston 20 zonings, piston 20 moves downwards.

Move downwards by piston 20, reduced the pressure of expansion chamber 12 and pressing chamber 17, when the pressure step-down in back pressure space 9, displacer 70 is moved upward under the effect of this pressure difference.

When displacer 70 is moved upward, expansion chamber 12 narrows down, thereby the working gas of expansion chamber 12 flow through heat absorbing fins 13, heat exchanger 14, radiating fin 15, intercommunicating pore 16, flow into the pressing chamber 17 of low temperature.Make to flow into the cooling and smaller volume of pressing chamber 17 working gass, reduced thus the pressure of expansion chamber 12 and pressing chamber 17.When the pressure decreased of expansion chamber 12 and pressing chamber 17, the movement direction of piston 20 is from downward changing into towards top.

Be moved upward the pressure that has promoted expansion chamber 12 and pressing chamber 17 by piston 20, when the pressure in back pressure space 9 uprises, displacer 70 moves downwards under this pressure difference effect.When displacer 70 moves to piston 20 and towards below, working gas flows in expansion chamber 12 from pressing chamber 17 again, has promoted the pressure of expansion chamber 12 and pressing chamber 17, and the movement direction of piston 20 is from being converted to downward towards top.

By above repetitive operation, displacer 70 and piston 20 are respectively along pumping.

When piston 20 to-and-fro motion, magnet 25 is moved up and down between yoke 18 and stator 30, the magnetic field generating period variation of coil 33, and therefore, in coil 33, generation electromotive force generation current flow.

As mentioned above, in the Stirling cylic engine of present embodiment, the base portion of displacer 70 pistons 20 (71,21) is formed by metal, and slide part (71,23,24) is formed by resin.Therefore, with the situation that base portion (71,21) is formed by resin etc., compare, can reduce like this thermal distortion, and the mechanical precision that can suppress displacer 70 under high temperature, piston 20 reduces.And, utilize and be arranged at the resin slide part (71,23,24) on base portion (71,21) outer surface, the sliding friction in cylinder can be suppressed lower.And then, with the mode of utilizing the coatings such as fluororesin, to compare, it is many that spendable resin kind becomes, therefore, with fluororesin coating ratio, can use the more excellent resins such as PPS of heat resistance and wearability, and compared with prior art more can improve heat resistance, wearability.

In addition, in the Stirling cylic engine of present embodiment, base portion (71,21) and slide part (71,23,24) are shaped to form as one by embedding.Thus, need not consider the difficulty or ease of assembling operation etc., can make as far as possible slide part 72 attenuation, the use amount of resin that therefore can heat distortion amount is many is controlled in inferior limit.Its result is that the mechanical precision that can further effectively suppress displacer 70 under high temperature condition, piston 20 reduces.

In addition, the utility model not merely is limited to above-mentioned mode of execution, also comprises other various variations.

In the above-described embodiment, both all have that slide part by the base portion of metal and resin forms and through embedding the block be shaped displacer 70 and piston 20, but, in other mode of executions of the present utility model, also can be only wherein what one there is this block.

In above-mentioned mode of execution, enumerated the generator example of Stirling cylic engine, the utility model be not limited to this also in, also can be applicable to refrigerating machine such as Stirling cylic engine etc.

In addition, the utility model can be applicable to export the Stirling engine of 1.2kW, can also be widely used in other multiple Stirling engines.

The utility model comprises that all mention all replacement contents in scope in claim.Any equivalence of doing in the utility model claim changes, within all belonging to the scope of the claims of this case application.

Claims (8)

1. a Stirling cylic engine, is characterized in that having: be fixed in the cylinder in housing; Be inserted in described cylinder one end and can reciprocating displacer; Be inserted in the described cylinder the other end and can reciprocating piston; In described displacer and described piston, at least one comprises: the base portion formed by metal; And formed by resin, be arranged on the outer surface of described base portion and the slide part that can slide along the internal surface of described cylinder.

2. Stirling cylic engine according to claim 1, it is characterized in that: described base portion and described slide part are shaped and form as one by embedding.

3. Stirling cylic engine according to claim 2, it is characterized in that: described slide part has the ring-type slip surface of the whole circumference of described base portion of the circular cross-section of surrounding.

4. Stirling cylic engine according to claim 3, it is characterized in that: described Stirling cylic engine has: be fixed in the stator in described housing; And the described base portion that is arranged at described piston, be applied to the magnet in the magnetic field on described stator with generation; Separately be provided with two described slide parts on the described base portion of described piston, described magnet is arranged between described two slide parts in the form of a ring in the mode of surrounding the whole circumference of described base portion cylindraceous.

5. according to the described Stirling cylic engine of claim 3 or 4, it is characterized in that: described base portion has and forms the groove that bottom width is greater than the opening portion width, will be used to form the resin filling of described slide part in the described groove of described base portion.

6. Stirling cylic engine according to claim 5, it is characterized in that: described Stirling cylic engine has: in the face of the expansion chamber of described displacer one end; Pressing chamber in the face of described displacer the other end; For being communicated with the gas flow path between described expansion chamber and described pressing chamber; And for the heat exchanger of the heat of accumulating the working gas that circulates in described gas flow path; The described base portion of described displacer is arranged on the described the other end in the face of described pressing chamber.

7. Stirling cylic engine according to claim 6, it is characterized in that: described displacer has head, and described head is formed by the material with adiabaticity, and is arranged at the described end in the face of described expansion chamber.

8. according to the described Stirling cylic engine of claim 6 or 7, it is characterized in that: described pressing chamber is formed between the described base portion of the described base portion of described displacer and described piston.

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