CN111706444B - Oil-gas isolation sealing structure based on Stirling engine - Google Patents
Oil-gas isolation sealing structure based on Stirling engine Download PDFInfo
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- CN111706444B CN111706444B CN202010704054.1A CN202010704054A CN111706444B CN 111706444 B CN111706444 B CN 111706444B CN 202010704054 A CN202010704054 A CN 202010704054A CN 111706444 B CN111706444 B CN 111706444B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/0535—Seals or sealing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Compressor (AREA)
Abstract
The invention relates to the technical field of Stirling engines, and discloses an oil-gas isolation sealing structure based on a Stirling engine, which is arranged between a compression cavity and a crank cavity in a machine base and comprises a sealing assembly sleeved on the middle section of a piston rod, wherein the sealing assembly comprises a sealing assembly body and a sealing end cover; the lower extreme in balanced chamber is equipped with the seal receptacle, is equipped with the cover of cover on the piston rod in the seal receptacle, and the upper end of cover is equipped with down the cover, and the position cover that is located balanced intracavity on the piston rod is equipped with the pressure spring, the lower extreme of pressure spring and the upper end butt of pressing down the cover. The invention has the beneficial effects of oil-gas isolation and sealing.
Description
Technical Field
The invention relates to the technical field of Stirling engines, in particular to an oil-gas isolation sealing structure based on a Stirling engine.
Background
The stirling engine was invented by the uk physicist Luo Bate stirling in 1816 and is therefore named "stirling engine". The Stirling engine pushes a piston to do work through pressure difference generated by endothermic expansion and exothermic contraction of working medium (hydrogen, nitrogen or helium) in a cylinder, so that heat energy is converted into mechanical energy to be output, and the Stirling engine is also called as a thermomotor. In the Stirling engine, a piston moves in a cylinder cavity of a machine base, namely, the piston moves between an expansion cavity and a compression cavity, gaseous working media are filled in the compression cavity, a crankshaft cavity (a crankshaft and a connecting rod mounting area) in the machine base is filled with lubricating oil to ensure sufficient lubrication and heat dissipation, and a piston rod is connected with the crankshaft through a connecting rod.
In order to completely isolate and seal the gaseous working medium from the lubricating oil in the compression cavity, a sealing mechanism is usually arranged in the middle section of a piston rod between the compression cavity and the crank cavity in the engine base, the sealing mechanism needs to completely isolate the lubricating oil from the gaseous working medium, and meanwhile the piston rod passes through the center of the sealing mechanism, so that good sliding sealing needs to be kept between the piston rod and the sealing mechanism. Because the lubricating oil pressure in the crank shaft cavity is greater than the air pressure in the compression cavity, and the piston rod is in a reciprocating motion state, lubricating oil easily permeates into the compression cavity along the peripheral gap of the piston rod, and finally, a gaseous working medium is polluted by the lubricating oil, so that the performance of the Stirling engine is reduced, and even the Stirling engine cannot work normally.
Disclosure of Invention
The invention provides an oil-gas isolation sealing structure based on a Stirling engine, which can stably isolate oil gas, ensure that the gaseous working medium is prevented from being polluted by lubricating oil, and improve the overall performance and the service life of the Stirling engine.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the oil-gas isolation sealing structure based on the Stirling engine is arranged between a compression cavity and a crank cavity in a machine base and comprises a sealing assembly sleeved on the middle section of a piston rod, wherein the sealing assembly comprises a sealing assembly body and a sealing end cover fixed with the upper end of the sealing assembly body, a closed balance cavity is arranged in the sealing assembly body, the piston rod penetrates through the center of the balance cavity, a balance air inlet communicated with the balance cavity is arranged on the side surface of the sealing assembly body, the outer end of the balance air inlet is connected with an external air source, and annular sealing rings are arranged on the periphery of the sealing assembly body and the periphery of the sealing end cover; the lower extreme in balanced chamber is equipped with the seal receptacle, be equipped with the cover of cover on the piston rod in the seal receptacle, the upper end of seal cover is equipped with down the cover, the position cover that is located balanced intracavity on the piston rod is equipped with the pressure spring, the lower extreme of pressure spring and the upper end butt of the cover of pushing down. A balance cavity is arranged in the sealing assembly, and the balance cavity is supplied with air through an external air source (the air is the same as gaseous working media in a compression cavity and an expansion cavity of the Stirling engine), so that the air pressure in the balance cavity is more than or equal to the oil pressure in the crank cavity and is used for balancing the oil pressure; meanwhile, air pressure in the balance cavity enables an air film to be formed at a sliding friction gap between the piston rod and the sealing assembly, so that friction resistance is reduced.
Preferably, a lower sealing conical surface is arranged at the lower end of the inner cavity of the sealing seat, an upper sealing conical surface is arranged at the lower end of the lower pressing sleeve, a sealing convex ring is arranged on the outer side of the lower end of the sealing sleeve, the lower end surface of the sealing convex ring is in fit sealing with the lower sealing conical surface, and the upper end surface of the sealing convex ring is in fit sealing with the upper sealing conical surface; a lower sealing ring is arranged between the lower end surface of the sealing seat and the bottom surface of the balance cavity. The lower end face of the sealing convex ring is jointed with the lower sealing conical surface to form static sealing, the upper end face of the sealing convex ring is jointed with the upper sealing conical surface to form static sealing, the lower end face of the sealing seat is sealed with the bottom face of the balance cavity through a lower sealing ring, the inner ring of the sealing sleeve is in sliding sealing with the piston rod, the lower side of the sealing sleeve is lubricating oil, and the upper side of the sealing sleeve is gas in the balance cavity; the sealing convex ring is under the pressure action of the pressure spring, has a good abrasion compensation function, and can ensure stable sealing between the sealing sleeve and the piston rod.
Preferably, an upper balance conical surface is arranged at the upper end of the inner hole of the sealing sleeve, a lower balance conical surface is arranged at the lower end of the inner hole of the sealing sleeve, the included angle between the upper balance conical surface and the axis of the piston rod is 5.1-5.6 degrees, and the included angle between the lower balance conical surface and the axis of the piston rod is 4.5-5 degrees. The upper balance conical surface and the piston rod are filled with balance gas, the lower balance conical surface and the piston rod are filled with lubricating oil, and because the included angles of the upper balance conical surface, the lower balance conical surface and the axis of the piston rod are different (the pressure angle is different), the lubricating oil in the lower balance conical surface can enter a gap between the sealing sleeve and the piston rod to form an oil film, but the lubricating oil cannot enter the upper balance conical surface, so that the sliding seal of the oil film is realized.
Preferably, an annular air inlet gap is formed between the outer side of the sealing seat and the side surface of the balance cavity, and the inner end of the balance air inlet hole is communicated with the annular air inlet gap. The gas at the balance air inlet hole firstly enters the annular air inlet gap and then enters the balance cavity, so that the gas in the balance cavity is more stable (vortex and turbulence are not easy to generate), and the vortex and turbulence are prevented from influencing the oil film balance between the sealing sleeve and the piston rod.
Preferably, the upper end of the balance cavity is provided with a sliding sleeve sleeved on the piston rod, an upper sealing ring is arranged between the outer side of the sliding sleeve and the side surface of the balance cavity, an annular groove is arranged on the inner side of the upper end of the sliding sleeve, an inner sealing ring sleeved on the piston rod is arranged in the annular groove, an annular limiting groove is arranged on the outer side of the inner sealing ring, an outer sealing ring is arranged in the annular limiting groove, an upper pressing sleeve is arranged on the upper side of the piston rod, the lower end of the upper pressing sleeve is in butt joint with the upper end surface of the inner sealing ring, and the upper end of the pressure spring is in butt joint with the sliding sleeve. The sliding sleeve, the upper sealing ring, the inner sealing ring and the outer sealing ring are used for sealing the upper end of the balance cavity and preventing gas in the balance cavity from entering the compression cavity.
Preferably, the outer side of the lower end of the sealing component body is provided with an annular outer diversion trench, the inner hole of the lower end of the sealing component body is provided with an annular inner diversion trench, a plurality of diversion through holes are arranged between the annular outer diversion trench and the annular inner diversion trench, a backflow gap communicated with the crankshaft cavity is formed between the inner hole of the sealing component body and the piston rod, and the engine base is provided with an oil filling hole communicated with the annular outer diversion trench. And the lubricating oil in the crankshaft cavity is pumped into the oil filling hole through the external circulating pump, so that the piston rod is circularly lubricated and radiated.
Preferably, the upper end of the piston rod is fixedly provided with a piston seat, the upper end of the piston seat is fixedly provided with a piston top, the piston top is internally provided with a gas storage cavity, the center of the piston rod is provided with a center hole, the side surface of the piston rod is provided with a side gas hole communicated with the center hole, the outer end of the side gas hole is communicated with the balance cavity, and the side gas hole is always positioned in the balance cavity in the movement process of the piston rod. The gas in the balance cavity plays a role in balancing lubricating oil pressure on one hand, and on the other hand, the gas is introduced into the gas storage cavity in the piston top for balancing the pressure difference between the inner side and the outer side of the piston top, and meanwhile, heat in the expansion cavity can be reduced and transferred to the compression cavity through the piston.
Preferably, two sealing grooves are arranged on the outer side of the piston seat, sealing rings are arranged in each sealing groove, and a supporting ring is arranged between the bottom of each sealing groove and the inner ring of each sealing ring; an annular balance groove is arranged at the position, located between the two seal grooves, of the piston seat, and a drainage channel used for connecting the air storage cavity and the annular balance groove is arranged in the piston seat. Because the outside of two sealing rings in the piston seat outside corresponds expansion chamber, compression chamber respectively, expansion chamber, compression intracavity all have higher atmospheric pressure to lead to there is very big differential pressure between two terminal surfaces of sealing ring, seriously reduce sealing effect and the life of sealing ring, get into annular balance groove after the gas in the balanced intracavity of this structure passes through side gas pocket, centre bore, gas storage chamber, drainage passageway for balanced sealing ring's air pressure difference between two terminal surfaces improves sealing effect and the life of sealing ring.
Preferably, the side surface of the sealing assembly body is further provided with a medium channel, and the upper end of the medium channel penetrates through the sealing assembly and then is communicated with the compression cavity. The air passage in the machine base is directly connected with the compression cavity through the medium passage, so that the whole structure is more compact and simplified.
Therefore, the invention has the following beneficial effects: (1) The external air source supplies air into the balance cavity to balance the oil pressure in the crank cavity, so that sliding seal between the piston rod and the seal assembly is more stable, and the sealing effect is better; (2) The lubricating oil in the crank cavity is utilized to circularly lubricate and dissipate heat at the lower end position of the piston rod through an external circulating pump, so that the good performance of the piston rod is maintained; (3) The air in the balance cavity can balance the air pressure difference inside and outside the piston top and the heat insulation performance, so that the stability of the piston is improved; (4) The gas in the balance cavity is also supplied to the annular balance groove, so that the air pressure at two ends of the sealing ring on the piston seat is balanced, the sealing effect of the sealing ring on the piston seat is improved, and the service life of the sealing ring is prolonged; (5) The sealing assembly integrates oil-gas isolation sealing, piston rod circulating lubrication and cooling, internal and external air pressure balance of the air storage cavity in the piston top, air pressure balance at two sides of the sealing ring and air supply of the compression cavity, so that parts of the whole Stirling engine are greatly reduced, the cost of the Stirling engine is reduced, the volume of the Stirling engine is reduced, meanwhile, assembly is also more convenient, heat loss is small, and the whole efficiency is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the seal assembly.
Fig. 3 is a schematic illustration of the connection of the piston rod, the sealing assembly.
Fig. 4 is a schematic view of a partial structure in fig. 3.
Fig. 5 is a schematic structural view of the sealing sleeve.
Fig. 6 is a partially enlarged schematic view of fig. 3 at a.
Fig. 7 is a partially enlarged schematic view of fig. 1 at B.
In the figure: the engine base 1, the oil filling hole 100, the compression chamber 2, the crank chamber 3, the piston rod 4, the piston seat 40, the piston top 41, the gas storage chamber 42, the central hole 43, the side air hole 44, the sealing ring 45, the supporting ring 46, the annular balance groove 47, the drainage channel 48, the sealing component 5, the sealing component body 6, the balance air inlet 60, the annular outer guide groove 61, the annular inner guide groove 62, the guide through hole 63, the backflow clearance 64, the sealing end cover 7, the balance chamber 8, the medium channel 9, the annular sealing ring 10, the sealing seat 11, the lower sealing conical surface 110, the annular air inlet clearance 111, the lower sealing ring 12, the sealing sleeve 13, the sealing convex ring 130, the upper balancing conical surface 131, the lower balancing conical surface 132, the lower pressing sleeve 14, the upper sealing conical surface 140, the pressure spring 15, the sliding sleeve 16, the upper sealing ring 17, the inner sealing ring 18, the outer sealing ring 19 and the upper pressing sleeve 20.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the oil-gas isolation sealing structure based on the stirling engine is arranged between a compression cavity 2 and a crank cavity 3 in a machine base 1, and comprises a sealing component 5 sleeved at the middle section of a piston rod 4, wherein the sealing component 5 comprises a sealing component body 6 and a sealing end cover 7 fixed with the upper end of the sealing component body 6, a closed balance cavity 8 is arranged in the sealing component body 6, the piston rod 4 penetrates through the center of the balance cavity, a medium channel 9 is further arranged on the side surface of the sealing component body 6, and the upper end of the medium channel 9 penetrates through the sealing component and then is communicated with the compression cavity;
the side surface of the sealing assembly body 6 is provided with a balance air inlet 60 communicated with the balance cavity 8, the outer end of the balance air inlet 60 is connected with an external air source, the external air source is the same as gaseous working media in a compression cavity and an expansion cavity of the Stirling engine, and the periphery of the sealing assembly body 6 and the periphery of the sealing end cover 7 are provided with annular sealing rings 10; the lower end of the balance cavity 8 is provided with a seal seat 11, a lower seal ring 12 is arranged between the lower end surface of the seal seat 11 and the bottom surface of the balance cavity, a seal sleeve 13 sleeved on a piston rod is arranged in the seal seat 11, and the upper end of the seal sleeve 13 is provided with a pressing sleeve 14; as shown in fig. 4 and 5, the lower end of the inner cavity of the sealing seat 11 is provided with a lower sealing conical surface 110, the lower end of the lower pressing sleeve 14 is provided with an upper sealing conical surface 140, the outer side of the lower end of the sealing sleeve 13 is provided with a sealing convex ring 130, the lower end surface of the sealing convex ring 130 is in fit sealing with the lower sealing conical surface, the upper end surface of the sealing convex ring 130 is in fit sealing with the upper sealing conical surface, the upper end of the inner hole of the sealing sleeve 13 is provided with an upper balancing conical surface 131, the included angle between the upper balancing conical surface and the axis of the piston rod is 5.1-5.6 degrees, the lower end of the inner hole of the sealing sleeve is provided with a lower balancing conical surface 132, the included angle between the lower balancing conical surface and the axis of the piston rod is 4.5-5 degrees, the part, which is positioned in the balancing cavity, of the piston rod 4 is sleeved with a pressure spring 15, and the lower end of the pressure spring is in butt joint with the upper end of the lower pressing sleeve; an annular air inlet gap 111 is formed between the outer side of the sealing seat 11 and the side surface of the balance cavity, and the inner end of the balance air inlet hole is communicated with the annular air inlet gap;
the upper end of balanced chamber 8 is equipped with the cover and establishes the sliding sleeve 16 on piston rod 4, is equipped with upper seal 17 between the side in the outside of sliding sleeve 16 and balanced chamber, and the upper end inboard of sliding sleeve is equipped with the ring channel, is equipped with the cover in the ring channel and establishes the interior sealing washer 18 on the piston rod, and the outside of interior sealing washer is equipped with annular spacing groove, is equipped with outer sealing washer 19 in the annular spacing groove, is equipped with on the upside that lies in the ring channel on piston rod 4 and presses the cover 20, presses the lower extreme of cover 20 and the up end butt of interior sealing washer, the upper end and the sliding sleeve butt of pressure spring.
As shown in fig. 3 and 6, an annular outer diversion trench 61 is arranged at the outer side of the lower end of the sealing assembly body 6, an annular inner diversion trench 62 is arranged at the inner hole of the lower end of the sealing assembly body 6, a plurality of diversion through holes 63 are formed between the annular outer diversion trench and the annular inner diversion trench, a backflow gap 64 communicated with the crank cavity is formed between the inner hole of the sealing assembly body 6 and the piston rod, an oil filling hole 100 communicated with the annular outer diversion trench is formed in the base 1, the crank cavity is connected with the oil filling hole 100 through an external circulating pump, and lubricating oil in the crank cavity is continuously pumped into the oil filling hole by the circulating pump, so that the piston rod is continuously lubricated and cooled (heat of the expansion cavity is transferred to the piston rod through a piston seat).
As shown in fig. 1, 3 and 7, a piston seat 40 is fixed at the upper end of a piston rod 4, a piston top 41 is fixed at the upper end of the piston seat, a gas storage cavity 42 is arranged in the piston top, a center hole 43 is arranged in the center of the piston rod 4, a side gas hole 44 communicated with the center hole is arranged on the side surface of the piston rod, the outer end of the side gas hole is communicated with a balance cavity, and the side gas hole is always positioned in the balance cavity during the movement of the piston rod; two sealing grooves are arranged on the outer side of the piston seat 40, a sealing ring 45 is arranged in each sealing groove, and a supporting ring 46 is arranged between the bottom of each sealing groove and the inner ring of each sealing ring; an annular balance groove 47 is arranged on the piston seat 40 at a position between the two seal grooves, and a drainage channel 48 for connecting the air storage cavity and the annular balance groove is arranged in the piston seat.
The principle of the invention is as follows, in combination with the accompanying drawings: the balance cavity is arranged in the seal assembly, and is supplied with air by an external air source (the air is the same as gaseous working media in the compression cavity and the expansion cavity of the Stirling engine), so that the air pressure in the balance cavity is more than or equal to the oil pressure in the crank cavity and is used for balancing the oil pressure, and lubricating oil is prevented from entering the compression cavity to pollute the gaseous working media; the gas in the balance cavity also supplies gas for the gas storage cavity in the piston top, so that the pressure inside and outside the piston top is balanced; on the other hand, the gas in the balance cavity also supplies gas for the annular balance groove, so that the gas pressures at two sides of the seal ring tend to be balanced, the sealing effect of the seal ring is improved, and the service life of the seal ring is prolonged; the sealing assembly integrates oil-gas isolation sealing, piston rod circulating lubrication and cooling, internal and external air pressure balance of the air storage cavity in the piston top, air pressure balance at two sides of the sealing ring and air supply of the compression cavity, so that parts of the whole Stirling engine are greatly reduced, the cost of the Stirling engine is reduced, the volume of the Stirling engine is reduced, meanwhile, assembly is also more convenient, heat loss is small, and the whole efficiency is improved.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications and the like made on the basis of the present invention to solve the substantially same technical problems and achieve the substantially same technical effects are included in the scope of the present invention.
Claims (9)
1. The oil-gas isolation sealing structure based on the Stirling engine is arranged between a compression cavity and a crank cavity in a machine base and is characterized by comprising a sealing component sleeved on the middle section of a piston rod, wherein the sealing component comprises a sealing component body and a sealing end cover fixed with the upper end of the sealing component body, a closed balance cavity is arranged in the sealing component body, the piston rod penetrates through the center of the balance cavity, a balance air inlet communicated with the balance cavity is arranged on the side surface of the sealing component body, the outer end of the balance air inlet is connected with an external air source, and annular sealing rings are arranged on the periphery of the sealing component body and the periphery of the sealing end cover; the lower extreme in balanced chamber is equipped with the seal receptacle, be equipped with the cover of cover on the piston rod in the seal receptacle, the upper end of seal cover is equipped with down the cover, the position cover that is located balanced intracavity on the piston rod is equipped with the pressure spring, the lower extreme of pressure spring and the upper end butt of the cover of pushing down.
2. The oil-gas isolation sealing structure based on the Stirling engine, according to claim 1, wherein a lower sealing conical surface is arranged at the lower end of an inner cavity of the sealing seat, an upper sealing conical surface is arranged at the lower end of the lower pressing sleeve, a sealing convex ring is arranged at the outer side of the lower end of the sealing sleeve, the lower end face of the sealing convex ring is in fit sealing with the lower sealing conical surface, and the upper end face of the sealing convex ring is in fit sealing with the upper sealing conical surface; a lower sealing ring is arranged between the lower end surface of the sealing seat and the bottom surface of the balance cavity.
3. The oil-gas isolation sealing structure based on the Stirling engine according to claim 2, wherein an upper balance conical surface is arranged at the upper end of an inner hole of the sealing sleeve, a lower balance conical surface is arranged at the lower end of the inner hole of the sealing sleeve, an included angle between the upper balance conical surface and an axis of the piston rod is 5.1-5.6 degrees, and an included angle between the lower balance conical surface and the axis of the piston rod is 4.5-5 degrees.
4. A stirling engine based oil and gas isolation seal in accordance with claim 3 wherein an annular inlet gap is formed between the outside of the seal housing and the side of the balance chamber, the inner end of the balance inlet opening communicating with the annular inlet gap.
5. The oil-gas isolation sealing structure based on the Stirling engine according to claim 1, 2, 3 or 4, wherein the upper end of the balance cavity is provided with a sliding sleeve sleeved on the piston rod, an upper sealing ring is arranged between the outer side of the sliding sleeve and the side surface of the balance cavity, the inner side of the upper end of the sliding sleeve is provided with an annular groove, an inner sealing ring sleeved on the piston rod is arranged in the annular groove, the outer side of the inner sealing ring is provided with an annular limiting groove, an outer sealing ring is arranged in the annular limiting groove, an upper pressing sleeve is arranged on the upper side of the piston rod, the lower end of the upper pressing sleeve is in butt joint with the upper end surface of the inner sealing ring, and the upper end of the pressure spring is in butt joint with the sliding sleeve.
6. The oil-gas isolation sealing structure based on the Stirling engine according to claim 1, 2, 3 or 4, wherein an annular outer diversion trench is arranged on the outer side of the lower end of the sealing assembly body, an annular inner diversion trench is arranged at the inner hole of the lower end of the sealing assembly body, a plurality of diversion through holes are arranged between the annular outer diversion trench and the annular inner diversion trench, a backflow gap communicated with a crank shaft cavity is formed between the inner hole of the sealing assembly body and a piston rod, and an oil filling hole communicated with the annular outer diversion trench is arranged on the engine base.
7. The oil-gas isolation sealing structure based on the Stirling engine according to claim 1, 2, 3 or 4, wherein a piston seat is fixed at the upper end of the piston rod, a piston top is fixed at the upper end of the piston seat, a gas storage cavity is arranged in the piston top, a center hole is arranged in the center of the piston rod, a side surface of the piston rod is provided with a side air hole communicated with the center hole, the outer end of the side air hole is communicated with the balance cavity, and the side air hole is always positioned in the balance cavity during the movement of the piston rod.
8. The oil-gas isolation sealing structure based on the Stirling engine, which is characterized in that two sealing grooves are arranged on the outer side of the piston seat, sealing rings are arranged in each sealing groove, and a supporting ring is arranged between the bottom of each sealing groove and the inner ring of each sealing ring; an annular balance groove is arranged at the position, located between the two seal grooves, of the piston seat, and a drainage channel used for connecting the air storage cavity and the annular balance groove is arranged in the piston seat.
9. The oil-gas isolation sealing structure based on the Stirling engine, according to claim 1, is characterized in that a medium channel is further arranged on the side face of the sealing assembly body, and the upper end of the medium channel penetrates through the sealing assembly and then is communicated with the compression cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010704054.1A CN111706444B (en) | 2020-07-21 | 2020-07-21 | Oil-gas isolation sealing structure based on Stirling engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010704054.1A CN111706444B (en) | 2020-07-21 | 2020-07-21 | Oil-gas isolation sealing structure based on Stirling engine |
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| CN111706444A CN111706444A (en) | 2020-09-25 |
| CN111706444B true CN111706444B (en) | 2023-08-01 |
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| CN202010704054.1A Active CN111706444B (en) | 2020-07-21 | 2020-07-21 | Oil-gas isolation sealing structure based on Stirling engine |
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| CN206754364U (en) * | 2017-01-18 | 2017-12-15 | 西部国际绿色能源斯特林(贵州)智能装备制造有限公司 | A kind of piston stirling engine rod seal structure |
| CN109780210B (en) * | 2019-03-12 | 2020-09-25 | 兰州理工大学 | Sealing medium sucking compensation device |
| CN110185552B (en) * | 2019-05-27 | 2021-03-26 | 兰州理工大学 | Stirling engine dynamic sealing system differential pressure compensation method |
| CN212406905U (en) * | 2020-07-21 | 2021-01-26 | 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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| JP4848058B1 (en) * | 2011-07-15 | 2011-12-28 | 亮 渡邉 | Stirling engine |
| CN202718769U (en) * | 2012-05-18 | 2013-02-06 | 中山市亚泰机械实业有限公司 | Pressure balance mechanism for solar Stirling generator |
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