CN201486688U - Rod sealing mechanism of double-acting piston type Stirling engine - Google Patents
Rod sealing mechanism of double-acting piston type Stirling engine Download PDFInfo
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- CN201486688U CN201486688U CN2009201725756U CN200920172575U CN201486688U CN 201486688 U CN201486688 U CN 201486688U CN 2009201725756 U CN2009201725756 U CN 2009201725756U CN 200920172575 U CN200920172575 U CN 200920172575U CN 201486688 U CN201486688 U CN 201486688U
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- piston rod
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- rod
- piston
- flexible material
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Abstract
The utility model relates to a rod sealing mechanism of a double-acting piston type Stirling engine. In the utility model, a piston rod is matched with a piston rod hole of a mechanism body, and the rod end of the piston rod which is matched with a slipper is spherical; two sealed ring grooves are arranged on the radial direction of the hole wall of the back part of the piston rod hole of the mechanism body, and O-shaped sealing rings are arranged in the sealed ring grooves; and an annular boss is arranged between the spherical rod end and a rod body, the annular boss of the piston rod is positioned in a big-end step hole of the piston rod hole, a sealing sleeve of a flexible material is connected on the outer circumference of the annular boss of the piston rod, and the other end of the sealing sleeve of the flexible material is connected with the hole wall of the middle part of the piston rod hole of the mechanism body. The utility model has simple structure, very small frictional resistance of movement, favorable sealing property, good assembly of grooves and easy manufacture. The movement sealing of the O-shaped sealing rings can reach 40MPa. The suitable temperature range of the sealing mechanism is minus20 to plus 200 DEG C.
Description
Technical field
The utility model relates to the rod seal mechanism of double-acting piston Stirling engine.
Background technique
Along with the situation of global energy and environmental protection is severe day by day, Stirling engine more and more comes into one's own owing to its extensive adaptability and fine environment characteristic with various energy resources.Obtained extensive studies and attention at aspects such as living beings power, solar power, underwater engine, space station power, heat pump air conditioner power, automobile-used hybrid propulsion power, be used for cogeneration of heat and power and can obtain the higher thermal efficiency and business efficiency.From the angle of using energy source, table 1 has been enumerated the noticeable nature and characteristic of Stirling engine.
The nature and characteristic of table 1 Stirling engine
| Future source of energy power development trend | The noticeable character of Stirling engine |
| Traditional fuel exhausts, uses alternative fuel day by day | Can use pluralities of fuel, fuel consumption low |
| The fossil fuel cost constantly increases | High efficiency, can utilize non-fossil fuel |
| Demand low noise, few air-polluting power plant | Noise is low |
| Used heat is renewable | The driving heat source of low temperature |
Stirling engine also has many problems to solve, its real process departs from reversible process, exist various irreversible losses, mainly comprise: leakage loss, backheat loss, flow resistance droop loss, the loss of shuttling back and forth, pumping loss, heating loss, incomplete heat exchange loss etc.Flowing of engine interior working medium is not simple one-way flow, but complicated alternation is mobile, and heating power, heat transfer, flow process are coupled mutually, and wherein the sealing of working medium is one of key issue, also solves well both at home and abroad at present.So, the research new type sealing device, reinforcing stimulus heat transfer and energy conversion process improve its thermal efficiency of cycle, have become one of important subject of Stirling engine.
Usually the working medium that adopts in the Stirling engine is helium, hydrogen, argon or nitrogen, and be to utilize gas to expand into low pressure from high pressure, wherein the leaks of helium and seepage are quite high, thereby in order to guarantee normal working of engine, must make in-engine gas flow constant, thereby the pressure ratio of motor is remained unchanged basically.
Sealing can be divided into static seal and motive sealing two big classes.Static seal mainly relies on the static deformation of pad or sealing surface and reaches sealing purpose, owing to be that two contact parts reach after at room temperature fastening, therefore in the time of must considering that two contacts are at high temperature worked, the problem whether the high temperature expansivity of the two is consistent, as inconsistent, need then to estimate in advance whether pretension amount of deformation under the room temperature can satisfy the difference of expansivity under the high temperature.Motive sealing is to rely on " obstruction " or " throttling " effect in the gap of two relative slips or rotational components to reach sealing purpose, and it can be divided into contact type mechanical seal and non-contact seal two big classes, concrete having of using: (1) exhibition-volume film phonograph seal.Utilize the elongation of exhibition-volume film and the motion requirement that shortening adapts to two-way ram bar and hole, open up-roll up film pressure reduction between the upper and lower and then be the oil pressure that utilizes below the film and regulate.Along with the rising of working medium temperature, then the life-span of exhibition-volume film significantly descends, and in addition, makes the complete machine structure relative complex, therefore this structure of less at present use.(2) sealing gland throttling type sealing.Utilize the micro-gap formation throttling blocking action between the two relative moving elements to reach sealing purpose.But this sealing is not cocksure sealing, and the tolerance of its leakage is directly proportional with the cube of gap numerical value, reduce the gap as far as possible under the situation of structure and processing conditions permission, increases seal length to reduce the leakage rate of gas.The seal gas ring spacing of recommending piston rod usually is 1/4 shank diameter.(3) magnetic current build sealing.Utilize ferrofluid under magnetic force, on axle, to form an O type liquid ring, reach the purpose of sealing.The advantage of this sealing is that the processing request (surface roughness, concentricity and rock) to component is low, and shortcoming is that every grade of pressure reduction is little, has only 0.35kPa, and the historical facts or anecdotes time spent needs multi-stage sealed.The temperature rise of ferrofluid is unique factor of restriction seal arrangement speed.
Take much count of at present the development of seal arrangement abroad, and obtained achievement, all fine as the novel sliding sealing device effect that " sealing of the ankle socks formula " device and Sweden of Dutch Philips company unites Stirling engine company.Latter's cost is low, and the life-span is longer.Except that Philips company, the Germany and the Stirling engine research institute of Sweden all adopt sliding sealing device, obviously can not satisfy usage requirement generally only 2000-2500 hour its working life, and also need are further perfect.
The model utility content
In order further to improve the body of Stirling engine and the sealing between the piston rod, the utility model provides a kind of rod seal mechanism of double-acting piston Stirling engine.
The technical solution of the utility model is as follows:
The rod seal mechanism of double-acting piston Stirling engine comprises body and piston rod, and piston rod cooperates with the piston rod hole of body, and the piston rod hole is a step hole; The large port of step hole is positioned at the body inboard, and portlet is positioned at the body outside; The piston rod rod end that cooperates with piston shoes is spherical, is provided with annular boss between spherical rod end and the shaft, and the annular boss of piston rod is positioned at the big end step hole in piston rod hole;
Rear portion, the piston rod hole hole wall of described body radially is provided with two closure gasket grooves, is provided with the O RunddichtringO in the closure gasket groove
Connecting the flexible material stuffing box gland on the excircle of the annular boss of described piston rod, the other end of flexible material stuffing box gland is connecting middle part, the piston rod hole hole wall of body.
Be respectively equipped with the protection back-up ring between the axial side wall of described O RunddichtringO and closure gasket groove.
Described protection back-up ring material is teflon or leather.
One end of described flexible material stuffing box gland by annular shim A fixedly connected the annular boss axial outer end face of piston rod, the flexible material stuffing box gland is fixedlyed connected by interior jump ring with the excircle of annular boss; Its other end by outer jump ring fixedly connected the piston rod hole middle part hole wall of body, be provided with annular shim B between the mesoporous axial end of the big end platform in this side flexible material stuffing box gland and piston rod hole.
Described flexible material stuffing box gland material is a canvas filler rubber.
Working principle of the present utility model is: (1) as shown in Figure 1 and Figure 2, the O RunddichtringO makes under the effect of elastic force own that circle compresses with the bar outer wall in the ring, forms primary sealing area, like this, gas just can not be by crack between the interior round and bar cylindrical of compression ring to external leakage.In addition, the gas pressure between ring and the annular groove produces axial force on the ring end face, make ring and annular groove lateral surface compressing, forms secondary sealing area.Moreover, gas pressure also acts on the O RunddichtringO outer circumference, has strengthened the radial force of primary sealing area so greatly.(2) sealing effect that adopts multiple tracks O RunddichtringO is tested discovery, gas is very big by the chock pressure difference of the first road ring, when the expansion chamber internal pressure was p, pressure was reduced to 0.26p behind the first road ring, and pressure is then reduced to 0.1p and 0.075p respectively behind second and third road ring.But O RunddichtringO number frictional loss more at most is big more, and mechanical efficiency descends, and the utility model adopts 2 road O RunddichtringOs.(3) the shell type sealing system that adopts extraordinary flexible canvas filler rubber to constitute is the final stage seal arrangement.Annular shim A, B work to be fixed flexible sealing material, and inner ring jump ring, outer ring jump ring play the radial seal effect.Wherein annular shim A and inner ring jump ring are fixed on the piston rod part, and along with piston rod is reciprocating; Annular shim B and outer ring jump ring are fixed on the body part.Because the sealing both sides differential pressure of membrane is very little, it has not only hindered the leakage of working medium effectively, and makes and obtained great prolongation in working life of complete machine.
The utility model is simple in structure, and the kinetic friction resistance is very little, favorable sealing property, and the assembling groove is made easily.The limit of O RunddichtringO working pressure (working medium working pressure) is influenced by operating temperature, movement velocity and design quality etc., and the motion sealing can reach 40Mpa.And different, this seal arrangement Applicable temperature scope is-20～+ 200 ℃ to the serviceability temperature that allows with used synthetic rubber kind and different formula rate.In order to prevent that seal ring from clamp-oning the gap and causing and bite, the both sides of O RunddichtringO all should add puts the protection back-up ring.
Description of drawings
Fig. 1 is the utility model structural representation,
Fig. 2 is the phase diagram that puts in place of moving of the utility model piston rod left.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described by embodiment.
Embodiment 1:
Referring to Fig. 1, the rod seal mechanism of double-acting piston Stirling engine comprises body 1 and piston rod 2, and piston rod 2 cooperates with the piston rod hole of body 1, and the piston rod hole is a step hole; The large port of step hole is positioned at the body inboard, and portlet is positioned at the body outside; The piston rod rod end that cooperates with piston shoes 3 is spherical, and piston shoes 3 are connecting swash plate 4; Be provided with annular boss between spherical rod end and the shaft, the annular boss of piston rod 2 is positioned at the big end step hole in piston rod hole;
Rear portion, the piston rod hole hole wall of body 1 radially is provided with two closure gasket grooves, and O RunddichtringO 5 is housed in the closure gasket groove, is separately installed with protection back-up ring 6 between the axial side wall of O RunddichtringO 5 and closure gasket groove, and protection back-up ring material is teflon or leather.
The excircle of the annular boss of piston rod 2 fixedly connected flexible material stuffing box gland 7, the other end of flexible material stuffing box gland 7 fixedly connected the piston rod hole middle part hole wall of body.Flexible material stuffing box gland material is a canvas filler rubber.
During work, when piston rod move left put in place after, see Fig. 2; Then move right, move right the state of putting in place and see Fig. 1, more then to left movement; So circulation.
Embodiment 2:
One end of flexible material stuffing box gland 7 by annular shim A10 fixedly connected the annular boss axial outer end face of piston rod, flexible material stuffing box gland 7 is fixedlyed connected by interior jump ring 8 with the excircle of annular boss; Its other end by outer jump ring 9 fixedly connected middle part, the piston rod hole hole wall of body, between the mesoporous axial end of the big end platform in this side flexible material stuffing box gland and piston rod hole annular shim B11 is installed.
Other is with embodiment 1.
Claims (5)
1. the rod seal mechanism of double-acting piston Stirling engine comprises body and piston rod, and piston rod cooperates with the piston rod hole of body, and the piston rod hole is a step hole; The large port of step hole is positioned at the body inboard, and portlet is positioned at the body outside; The piston rod rod end that cooperates with piston shoes is spherical, is provided with annular boss between spherical rod end and the shaft, and the annular boss of piston rod is positioned at the big end step hole in piston rod hole, it is characterized in that:
Rear portion, the piston rod hole hole wall of described body radially is provided with two closure gasket grooves, is provided with the O RunddichtringO in the closure gasket groove,
Connecting the flexible material stuffing box gland on the excircle of the annular boss of described piston rod, the other end of flexible material stuffing box gland is connecting middle part, the piston rod hole hole wall of body.
2. the rod seal mechanism of double-acting piston Stirling engine according to claim 1 is characterized in that: be respectively equipped with the protection back-up ring between the axial side wall of described O RunddichtringO and closure gasket groove.
3. the rod seal mechanism of double-acting piston Stirling engine according to claim 2 is characterized in that: described protection back-up ring material is teflon or leather.
4. the rod seal mechanism of double-acting piston Stirling engine according to claim 1, it is characterized in that: an end of described flexible material stuffing box gland by annular shim A fixedly connected the annular boss axial outer end face of piston rod, the flexible material stuffing box gland is fixedlyed connected by interior jump ring with the excircle of annular boss; Its other end by outer jump ring fixedly connected the piston rod hole middle part hole wall of body, be provided with annular shim B between the mesoporous axial end of the big end platform in this side flexible material stuffing box gland and piston rod hole.
5. the rod seal mechanism of double-acting piston Stirling engine according to claim 4 is characterized in that: described flexible material stuffing box gland material is a canvas filler rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201725756U CN201486688U (en) | 2009-06-15 | 2009-06-15 | Rod sealing mechanism of double-acting piston type Stirling engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201725756U CN201486688U (en) | 2009-06-15 | 2009-06-15 | Rod sealing mechanism of double-acting piston type Stirling engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201486688U true CN201486688U (en) | 2010-05-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201725756U Expired - Fee Related CN201486688U (en) | 2009-06-15 | 2009-06-15 | Rod sealing mechanism of double-acting piston type Stirling engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201486688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706444A (en) * | 2020-07-21 | 2020-09-25 | 杭州英洛威能源技术有限公司 | Oil-gas isolation sealing structure based on Stirling engine |
-
2009
- 2009-06-15 CN CN2009201725756U patent/CN201486688U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706444A (en) * | 2020-07-21 | 2020-09-25 | 杭州英洛威能源技术有限公司 | Oil-gas isolation sealing structure based on Stirling engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20120615 |