CN104595055A - Piston rod sealing assembly for hot-air engine - Google Patents
Piston rod sealing assembly for hot-air engine Download PDFInfo
- Publication number
- CN104595055A CN104595055A CN201410767120.4A CN201410767120A CN104595055A CN 104595055 A CN104595055 A CN 104595055A CN 201410767120 A CN201410767120 A CN 201410767120A CN 104595055 A CN104595055 A CN 104595055A
- Authority
- CN
- China
- Prior art keywords
- piston rod
- sealing assembly
- primary seal
- seal
- boss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 57
- 210000004907 gland Anatomy 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 239000003921 oil Substances 0.000 description 9
- 239000010721 machine oil Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
- F02G1/0535—Seals or sealing arrangements
-
- 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
- F02G2253/00—Seals
- F02G2253/03—Stem seals
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a piston rod sealing assembly for a hot-air engine. The assembly comprises a cap type seal arranged on a piston rod in a sleeving mode and a main sealing assembly, wherein the main sealing assembly is composed of a conical base, a main seal, a main seal gland and a spring; an auxiliary sealing assembly is further arranged between the main sealing assembly and the cap type seal and is composed of an auxiliary main seal, an auxiliary main seal gland and a spring, the auxiliary main seal is a rod sealing piece arranged on the piston rod in a sleeving mode, an upper conical face boss and a lower conical face boss are arranged on the outer side of the auxiliary main seal, the lower end conical face of each auxiliary main seal boss abuts against a corresponding conical face boss of a spring base, the upper end conical face of each auxiliary main seal boss is pressed by a corresponding conical face boss of the auxiliary main seal gland, and the upper end of the auxiliary main seal gland is tightly pressed by the spring. The piston rod sealing assembly has the advantages of being compact in structure and good in sealing effect and is particularly suitable for the application occasion where a solar operated hot-air engine and the like need to run in a front-stand state or in an inverted state.
Description
Technical field
The present invention relates to engine art, especially about heat engine piston rod seal.
Background technique
Heat engine is a kind of outer combustion-ing engine of the working medium in the heat or heat source closed cycle that are produced by external-burning, and during Stirling engine work, Working medium gas is in the inner closed cycle acting of heat engine.In order to improve the Performance And Reliability of motor, preventing refrigerant leakage and being polluted, improving the sealing effect of working substance system, improving rod seal effect particularly important.Publication number is that the Chinese invention patent of CN200312345 discloses the anti-oil seal structure of a kind of oil-free lubricating piston formula gas compressor piston bar, sealing structure is sealed by the hat type of self tightening and rod-type seals two-part and forms, rod-type sealing by bottom sealing socket, be resisted against bottom sealing socket one end and there is taper bulge loop and cover shaft seal on the piston rod, there is the lower spring cup of the conical surface matched with this shaft seal taper bulge loop, and upper spring seat and spring composition.Relative to traditional stuffing box and oil deflector combined seal structure, this structure is preventing from being significantly improved in more than 10MPa high pressure gas leakage, as long as sealing material apolegamy is suitable, the machining accuracy of part can ensure, good sealing effect can be formed, in the dynamic case, for the helium that leaks is very strong between shaft seal and piston rod, when in cylinder, helium pressure is about 10MPa, the sealing effect of this structure can reach 1.25NL/h.But said structure, for the heat engine of particular application, such as solar heat mechanism of qi, because condition needs, in work, heat engine needs constantly to change spatial position, as being in inversion state, during work, machine oil is usually in rod seal, the namely upper end of primary seal, be affected by gravity main sealing assembly upper end and there will be long-pending oil condition, the machine oil accumulated will strengthen the oil impregnate effect of piston rod, machine oil very easily brings working substance system into, working medium is produced and pollutes, under finding heat engine inversion state in test, when namely primary seal is in upper end state, work will be contaminated less than 10 hours working medium, the normal requirement used can not be met.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of heat engine piston rod seal pack, solve current piston rod seal pack and easily occur oil impregnate, working medium is vulnerable to pollute, the problem of poor reliability, oil sealing is effective, structure is simple, reliability is high feature that it has.
The object of the invention is to solve by the following technical programs:
A kind of heat engine piston rod seal pack, comprise the hat type sealing and main sealing assembly that are nested with on the piston rod, main sealing assembly is by conical seat, primary seal, primary seal gland and spring composition, a secondary main sealing assembly is also provided with between described main sealing assembly and hat type sealing, secondary main sealing assembly is by secondary primary seal, secondary primary seal gland and spring composition, secondary primary seal is the shaft seal be nested with on the piston rod, with upper outside it, the boss of lower two conical surfaces, the lower end conical surface of secondary primary seal boss is resisted against on the corresponding conical surface boss of spring seat, and the upper end conical surface of secondary primary seal boss is put by the corresponding conical surface boss pressure of secondary primary seal gland, the upper end spring compression of secondary primary seal gland.
Preferably, above-mentioned heat engine piston rod seal pack, described main sealing assembly is identical with secondary main sealing assembly installation direction on the piston rod, and shares one group of spring.
Preferably, above-mentioned heat engine piston rod seal pack, described main sealing assembly and secondary main sealing assembly mounting distance are on the piston rod 1mm ~ 2mm.
Preferably, above-mentioned heat engine piston rod seal pack, described primary seal and secondary primary seal manufacture by filled polytetrafluoroethylene material.
Preferably, above-mentioned heat engine piston rod seal pack, is provided with the ring that rises in the endoporus of described primary seal and secondary primary seal one end.
In a word, beneficial effect of the present invention is as follows:
Technological scheme of the present invention adds a secondary main sealing assembly between former main sealing assembly and working fluid chamber, and it not only plays the effect of sealing working medium, and also play the effect of oil sealing, it can stop the micro-machine oil by piston rod is brought into spread in buffer cavity.Trace machine oil is brought into when piston rod motion in the other direction in the gap space between primary seal and piston rod, and then is brought in crankcase, prevents working medium contaminated.Machined a set of black box according to technological scheme of the present invention and carried out prototype test, through 1000h certification test, unit operation is normal, and open and inspect chemical examination, working medium does not have contaminated, respond well.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Number in the figure illustrates:
1. piston rod, 2. primary seal, 3. primary seal gland, 4. rise ring, 5. spring seat, 6. gland, 7. hat type sealing, 8. secondary primary seal, 9. spring, 10. secondary primary seal gland, and 11. conical seats, 12.O shape is enclosed, 13. cylinder sleeves.
Embodiment
As shown in Figure 1, this heat engine piston rod seal pack, it seals 7 by the hat type be nested with on piston rod 1, main sealing assembly, secondary main sealing assembly and gland 6 form, main sealing assembly is by conical seat 11, primary seal 2, primary seal gland 3 and spring 9 form, secondary main sealing assembly is arranged between main sealing assembly and hat type sealing 7, secondary main sealing assembly is by secondary primary seal 8, secondary primary seal gland 10 and spring 9 form, secondary primary seal 8 and primary seal 2 structural similarity, for being nested with the shaft seal on piston rod 1, with upper outside it, the boss of lower two conical surfaces, the lower end conical surface of this boss is resisted against on the corresponding conical surface boss of spring seat 5, the upper end conical surface of this boss is put by the corresponding conical surface boss pressure of secondary primary seal gland 10, the upper end spring 9 of secondary primary seal gland 10 compresses.Described main sealing assembly is identical with the installation direction of secondary main sealing assembly on piston rod 1, and shares one group of spring 9.
In the upper end of primary seal 2, namely primary seal 2 cone boss upper end, is resisted against on conical seat 11, and lower end abutment, on primary seal gland 3, in conical seat 11 upper end, and is also provided with one and seals O shape and enclose 12, prevent oil gas from entering between cylinder sleeve 13.
Main sealing assembly and the mounting distance of secondary main sealing assembly on piston rod 1 are 1mm ~ 2mm.
Described primary seal 2 and secondary primary seal 8 manufacture by filled polytetrafluoroethylene material.
Install for ease of primary seal 2 and secondary primary seal 8, generally in the endoporus of described primary seal 2 one end, be provided with the ring 4 that rises, in the endoporus of secondary primary seal 8 one end, be also provided with the ring that rises.
The present invention can under the prerequisite not increasing installing space, substantially increase the working medium sealing effect of piston rod 1, particularly prevent working medium by the effect of oil pollution, it has compact structure, feature easy for installation, the application that two kinds of conversion attitudes are run just is being put or be inverted to the needs such as very applicable solar heat mechanism of qi.
Those skilled in the art will recognize that; above embodiment is the unrestricted technological scheme described in the invention for illustration of the present invention only; be not limited to above form; can also modify to the present invention or equivalent replacement; but all do not depart from technological scheme and the improvement thereof of the spirit and scope of the present invention, all will fall into protection scope of the present invention.
Claims (5)
1. a heat engine piston rod seal pack, comprise the hat type sealing (7) and the main sealing assembly that are nested with on piston rod (1), main sealing assembly is by conical seat (11), primary seal (2), primary seal gland (3) and spring (9) composition, it is characterized in that: between described main sealing assembly and hat type sealing (7), be also provided with a secondary main sealing assembly, secondary main sealing assembly is by secondary primary seal (8), secondary primary seal gland (10) and spring (9) composition, secondary primary seal (8) is for being nested with the shaft seal on piston rod (1), with upper outside it, the boss of lower two conical surfaces, the lower end conical surface of secondary primary seal (8) boss is resisted against on the corresponding conical surface boss of spring seat (5), and the upper end conical surface of secondary primary seal (8) boss is put by the corresponding conical surface boss pressure of secondary primary seal gland (10), the upper end of secondary primary seal gland (10) compresses with spring (9).
2. heat engine piston rod seal pack according to claim 1, is characterized in that: described main sealing assembly is identical with the installation direction of secondary main sealing assembly on piston rod (1), and shares one group of spring (9).
3. heat engine piston rod seal pack according to claim 1 and 2, is characterized in that: described main sealing assembly and the mounting distance of secondary main sealing assembly on piston rod (1) are 1mm ~ 2mm.
4. heat engine piston rod seal pack according to claim 3, is characterized in that: described primary seal (2) and secondary primary seal (8) manufacture by filled polytetrafluoroethylene material.
5. heat engine piston rod seal pack according to claim 4, is characterized in that: in the endoporus of described primary seal and secondary primary seal (8) one end, be provided with the ring that rises.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410767120.4A CN104595055B (en) | 2014-12-12 | 2014-12-12 | A kind of thermomotor piston rod seal pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410767120.4A CN104595055B (en) | 2014-12-12 | 2014-12-12 | A kind of thermomotor piston rod seal pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104595055A true CN104595055A (en) | 2015-05-06 |
| CN104595055B CN104595055B (en) | 2019-08-02 |
Family
ID=53121045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410767120.4A Active CN104595055B (en) | 2014-12-12 | 2014-12-12 | A kind of thermomotor piston rod seal pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104595055B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020159423A1 (en) * | 2019-01-29 | 2020-08-06 | Azelio Ab | Improved rod seal assemblies for machines with crossheads and sealed oscillating rods |
| EP3746684A4 (en) * | 2018-02-02 | 2021-11-24 | Høeg, Arne | PISTON ROD TIGHTNESS |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4251081A (en) * | 1978-12-12 | 1981-02-17 | Skoog Knut A | Piston rod seal |
| CN201696163U (en) * | 2010-04-15 | 2011-01-05 | 上海齐耀动力技术有限公司 | Piston rod seal assembly for small Stirling engine |
| CN103063376A (en) * | 2013-01-04 | 2013-04-24 | 兰州理工大学 | Testing table and testing method for reciprocating-type piston rod sliding sealing performance testing |
-
2014
- 2014-12-12 CN CN201410767120.4A patent/CN104595055B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4251081A (en) * | 1978-12-12 | 1981-02-17 | Skoog Knut A | Piston rod seal |
| CN201696163U (en) * | 2010-04-15 | 2011-01-05 | 上海齐耀动力技术有限公司 | Piston rod seal assembly for small Stirling engine |
| CN103063376A (en) * | 2013-01-04 | 2013-04-24 | 兰州理工大学 | Testing table and testing method for reciprocating-type piston rod sliding sealing performance testing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3746684A4 (en) * | 2018-02-02 | 2021-11-24 | Høeg, Arne | PISTON ROD TIGHTNESS |
| WO2020159423A1 (en) * | 2019-01-29 | 2020-08-06 | Azelio Ab | Improved rod seal assemblies for machines with crossheads and sealed oscillating rods |
| US12215653B2 (en) | 2019-01-29 | 2025-02-04 | EnergyIntel Services Ltd. | Rod seal assemblies for machines with crossheads and sealed oscillating rods |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104595055B (en) | 2019-08-02 |
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