CN109058463B - Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange - Google Patents

Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange Download PDF

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Publication number
CN109058463B
CN109058463B CN201810989807.0A CN201810989807A CN109058463B CN 109058463 B CN109058463 B CN 109058463B CN 201810989807 A CN201810989807 A CN 201810989807A CN 109058463 B CN109058463 B CN 109058463B
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China
Prior art keywords
lip
spiral
air
rotating shaft
close
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CN201810989807.0A
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CN109058463A (en
Inventor
彭旭东
蔡智媛
王冰清
赵文静
孟祥铠
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324Arrangements for lubrication or cooling of the sealing itself
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

The wear-resistant rotating shaft lip-shaped sealing device comprises a lip-shaped sealing ring, a supporting frame, a pressing cover, an end cover and a rotating shaft, wherein the lip-shaped sealing ring comprises a metal framework, a tightening spring and a rubber sealing body, and the lip-shaped sealing ring and the supporting frame are fixed on the pressing cover through bolts. A spiral diversion trench is formed in the surface of the part, matched with the support frame, of the rear lip corner inclined plane of the rubber sealing body; the cross section of the support frame is L-shaped, the support frame is positioned at the air side, an air inlet hole is arranged on the circumferential surface which is close to the rotating shaft, and an air exhaust hole is arranged on the outer vertical surface which is close to the gland and exposed in the air; the air inlet and the air outlet are both positioned in the slotting interval of the inclined plane of the rear lip corner. The rotation axis is close to and sets up a pair of spiral microgrooves that revolve to opposite on the surface of lip seal circle air side, and it revolves to the same with the rotation axis soon to being close to the spiral microgroove of lip wherein, and it revolves to revolving to opposite with the rotation axis soon to keeping away from the spiral microgroove of lip, and two bundles of spiral microgrooves all reduce gradually along helix direction groove depth and groove width.

Description

Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange
Technical Field
The invention relates to the field of rubber and plastic sealing, in particular to a rotary shaft lip-shaped sealing device.
Background
Lip seals (oil seals for short) are a form of elastomeric seal that has a self-sealing action to prevent leakage of lubricating oil and to prevent foreign matter from entering the sealing area. Because of its advantages of simple structure and low cost, it is widely used in various rotating machines. The basic structure of lip seal generally includes three parts such as rubber seal, metal framework and cramp hoop spring, relies on the interference fit between the lip part of rubber seal and the counter shaft and seals the medium, and when operating pressure is higher, makes the excessive deformation of oil blanket waist easily, causes lip and axle area of contact to increase, causes the frictional heating aggravation to lead to sealed inefficacy.
Statistically, most oil seal failures are caused by high temperatures caused by oil seal lip rubbing. The contact friction between the oil seal lip and the surface of the rotating shaft generates a large amount of heat which is accumulated at a contact part to cause the temperature of the lip to be sharply increased, and the aging, hardening and accelerated abrasion of the lip are accelerated. When the oil seal normally works, a very thin lubricating oil film is arranged between the oil seal lip and the rotating shaft to separate the shaft from the oil seal lip, so that direct contact between the shaft and the lip can be avoided, frictional heating is reduced, and leakage of lubricating oil can be effectively prevented. When the shaft rotates at high speed, the heat generated by the oil seal lip is increased rapidly, so that the temperature of the oil cavity and the oil seal lip is increased, and the excessive temperature can cause the accelerated aging of an oil seal rubber material to cause the sealing failure; the viscosity of the lubricating oil is reduced, the thickness of the oil film is also reduced, and when the thickness of the oil film is smaller than the critical film thickness, lubrication failure of the oil seal occurs, so that sealing failure is further caused.
In the practical use process, oil leaked from the air side often adheres to suspended matters in the air, and the oil is accompanied with high-speed rotation of the shaft, so that the impurities are brought into the sealing lip, abrasive wear is formed, and the wear of the sealing lip is accelerated to cause sealing failure. At present, a solution to failure caused by overhigh temperature of a lip of an oil seal is to generally search for a high-temperature-resistant and wear-resistant oil seal material, optimize a lip seal structure and increase a dust lip so that the oil seal adapts to the conditions of higher lip temperature and abrasive wear, but the problems of high lip temperature and impurity adhesion wear in use cannot be avoided.
Publication number CN1508437A discloses a wear-resistant structure for a lip seal of a compressor crankshaft, which is simple in operation and low in cost. This patent is through installing a wear-resisting sleeve at compressor crankshaft and lip seal contact zone adhesion, though can reduce the friction between lip seal and the compressor crankshaft, prevents the bent axle wearing and tearing, reduces the maintenance cost. But the installation leakproofness of sleeve can't guarantee, and has the suspension that can't reduce lip seal lip frictional heat and adhesion in the air of lip, avoids the defect of lip high temperature and impurity adhesion wearing and tearing.
Disclosure of Invention
The invention aims to overcome the defects of overhigh lip temperature and abrasive wear caused by impurity adhesion in the use process of the existing lip seal, and provides a wear-resistant rotating shaft lip seal device which has a simple structure, can actively accelerate the heat dissipation of a lip and reduce the impurity adhesion entering the lip and can strengthen the heat exchange.
The invention is realized by the following technical scheme:
a wear-resistant rotary shaft lip seal device with forced convection heat transfer comprises a lip seal ring 4, a support frame 3, a gland 2, an end cover 1 and a rotary shaft 5, wherein the lip seal ring 4 comprises a metal framework 41, a tightening spring 42 and a rubber seal body 43; one side of the metal framework 41 is an oil side, and the other side is an air side; the lip-shaped sealing ring 4 and the supporting frame 3 are fixedly connected on the gland 2 through bolts 21; a spiral diversion trench 31 is formed in the surface of the part, matched with the support frame 3, of the rear lip angle inclined plane of the rubber sealing body 43; the section of the support frame 3 is L-shaped, the support frame is positioned at the air side, an air inlet 32 is arranged on the inner circumferential surface close to the rotating shaft 5, an air outlet 33 is arranged on the outer vertical surface close to the gland 2 and exposed in the air, and the air inlet 32 and the air outlet 33 are both positioned in the slotting interval of the rear lip corner inclined surface of the rubber sealing body 43; the gland 2 is fixedly connected to the end cover 1 through a screw 11; the surface of the rotating shaft 5 close to the air side of the lip-shaped sealing ring 4 is provided with a pair of first spiral micro-groove 51 and a pair of second spiral micro-groove 52 which are opposite in turning direction, wherein the turning direction of the first spiral micro-groove 51 close to the lip is the same as the turning direction of the rotating shaft 5, the turning direction of the second spiral micro-groove 52 far away from the lip is opposite to the turning direction of the rotating shaft 5, and the groove depth and the groove width of the first spiral micro-groove 51 and the second spiral micro-groove 52 are gradually reduced along the spiral line direction.
Further, the inlet hole 32 and the outlet hole 33 are circular holes, and the diameters thereof are set to dinAnd dout(ii) a D isinAnd doutAll the sizes of the two components are related to the diameter D of the rotating shaftThe relationship between them is: dout=0.6~0.8din,din=0.03~0.1D。
Further, the matching surface of the supporting frame and the inclined surface of the rear lip of the rubber sealing body 43 is simultaneously provided with a spiral guide groove 31, and the rotation direction of the spiral guide groove 31 is opposite to the rotation direction of the rotating shaft 5.
Further, the cross-sectional shapes of the spiral micro grooves 51, 52 and the spiral guide groove 31 are one of a rectangle, a triangle, a trapezoid and a circular arc.
The working principle of the invention is as follows:
the invention provides a wear-resistant rotary shaft lip-shaped sealing ring device which can guide gas to flow, accelerate the reduction of lip temperature and reduce the adhesion and wear of impurities and can perform forced convection heat transfer by matching a spiral micro-groove on the surface of a rotary shaft with a spiral flow guide groove matched between a support frame and a lip-shaped sealing rubber sealing body, and is specifically described as follows: a pair of spiral micro grooves are axially formed in the surface of an air side shaft of the rotating shaft close to the lip-shaped sealing lip, the spiral micro grooves are opposite in rotating direction, and the groove depth and the groove width of the spiral micro grooves are gradually reduced along the spiral line direction; a supporting frame is arranged on the air side of the lip-shaped seal, the cross section of the supporting frame is L-shaped and is positioned on the air side, and a spiral diversion trench is arranged on the partial surface of the supporting frame matched with the inclined plane of the rear lip corner of the rubber seal body in a matched manner; an air inlet hole is arranged on the inner circumferential surface of the ring, which is close to the rotating shaft, of the support frame above the junction of the pair of spiral micro grooves, and an air outlet hole is arranged on the outer vertical surface, which is close to the gland and exposed in the air, of the support frame. When the oil seal normally works, hydraulic oil acts on the lip seal to enable the rubber seal body to be attached to the support frame, so that the air inlet hole, the spiral diversion groove and the air outlet hole form a closed channel, when the rotating shaft rotates at a high speed, the first spiral micro groove on the surface of the shaft, which is close to the lip side, disturbs hot air at the lip to drive the hot air to move to the atmosphere side, the reverse second spiral micro groove, which is far away from the lip, disturbs cold air at the outer side to enable the cold air to move to the lip side of the oil seal, so that two air streams are gathered at the intersection of the grooves to move to the air inlet hole and enter the spiral diversion groove, the air flows in the spiral diversion groove, and the heat conducted by the; in addition, the spiral micro-groove on the surface of the shaft close to the lip can contain adhered impurities and move to the atmosphere far away from the lip along with disturbed airflow, so that the impurities are prevented from entering the lip to cause abrasion.
The invention has the following beneficial effects:
install at lip seal air side and open the support frame that is equipped with the spiral guiding gutter with rubber seal waist contact side, a pair of spiral microgrooves are seted up to supporting rotation axis near the air side axial surface axial of lip seal lip department, make the hot-air lateral motion and the motion of external cold air guiding gutter of lip department, carry out the heat exchange with the lip seal, reduce the temperature rise of lip, the spiral microgroove that is close to the axial surface of lip department simultaneously can hold the impurity of clearance adhesion, prevent that impurity from getting into the lip and arousing wearing and tearing, effectively prolong the life that the lip sealed.
Drawings
Fig. 1 is a schematic structural view of a wear-resistant rotary shaft lip seal device with forced convection heat transfer.
Fig. 2 is a schematic view of the supporting frame structure of the present invention.
FIG. 3 is a schematic structural diagram of a spiral micro-groove of a rotating shaft according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, wherein:
1-end cap; 2-pressing the cover; 3-a support frame; 4-lip-shaped sealing ring; 5-a rotating shaft; 11-a screw; 21-bolt; 31-spiral diversion trenches; 32-an air intake; 33-vent hole; 41-metal skeleton; 42-a garter spring; 43-rubber seal; 51. 52-spiral microgrooves.
A wear-resistant rotary shaft lip seal device with forced convection heat transfer comprises a lip seal ring 4, a support frame 3, a gland 2, an end cover 1 and a rotary shaft 5, wherein the lip seal ring 4 comprises a metal framework 41, a tightening spring 42 and a rubber seal body 43; one side of the metal framework 41 is an oil side, and the other side is an air side; the lip-shaped sealing ring 4 and the supporting frame 3 are connected together through a bolt 21 and fixed on the gland 2; a spiral diversion trench 31 is formed in the surface of the part, matched with the support frame 3, of the rear lip angle inclined plane of the rubber sealing body 43; the section of the support frame 3 is L-shaped, the support frame is positioned at the air side, an air inlet 32 is arranged on the inner circumferential surface close to the rotating shaft 5, an air outlet 33 is arranged on the outer vertical surface close to the gland 2 and exposed in the air, and the air inlet 32 and the air outlet 33 are both positioned in the slotting interval of the rear lip corner inclined surface of the rubber sealing body 43; the gland 2 is fixed on the end cover 1 through a screw 11; the surface of the rotating shaft 5 close to the air side of the lip-shaped sealing ring 4 is provided with a pair of first spiral micro-groove 51 and a pair of second spiral micro-groove 52 which are opposite in turning direction, wherein the turning direction of the first spiral micro-groove 51 close to the lip is the same as the turning direction of the rotating shaft 5, the turning direction of the second spiral micro-groove 52 far away from the lip is opposite to the turning direction of the rotating shaft 5, and the groove depth and the groove width of the first spiral micro-groove 51 and the second spiral micro-groove 52 are gradually reduced along the spiral line direction.
The openings of the air inlet hole 32 and the air outlet hole 33 are circular openings, and the diameters of the openings are respectively set as dinAnd dout(ii) a D isinAnd doutThe size of the three is related to the diameter D of the rotating shaft, and the relationship among the three is as follows: dout=0.6~0.8din,din=0.03~0.1D。
The supporting frame 3 and the rubber sealing body 43 have spiral diversion grooves 31 on the surface matched with the rear lip angle inclined plane, and the rotation direction of the spiral diversion grooves 31 is opposite to that of the rotating shaft 5
The cross-sectional shapes of the first spiral micro groove 51, the second spiral micro groove 5152 and the spiral guide groove 31 are one of a rectangle, a triangle, a trapezoid and an arc. The first spiral micro-groove 51 close to the lip side disturbs hot air at the lip to move towards the atmosphere far away from the lip, the second spiral micro-groove 52 far away from the lip disturbs cold air at the outer side to move towards the lip side of the oil seal, the first spiral micro-groove 51 and the second spiral micro-groove 52 are converged and gathered at the air inlet 32 and enter the spiral diversion groove 31, and therefore conduction and exchange of lip heat are accelerated under the combined action of the first spiral micro-groove 51 and the second spiral micro-groove 52 on the surfaces of the support frame 3 and the rotating shaft 5.
In this embodiment, the lip seal may be excessively deformed under a high pressure, which may increase a contact area between the lip and the rotating shaft, and may cause increased heat generation due to friction, thereby causing failure. Through at oil blanket air side erection bracing frame, when preventing that the oil blanket from excessively warping, the heat convection of the air of lip department has effectively slowed down the lip temperature rise with higher speed, and the little slot of spiral of lip department can hold the impurity of clearance adhesion simultaneously, prevents that impurity from getting into the lip and arousing wearing and tearing, effectively prolongs the life of oil blanket.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.

Claims (4)

1. A wear-resistant rotary shaft lip seal device with forced convection heat transfer comprises a lip seal ring (4), a support frame (3), a gland (2), an end cover (1) and a rotary shaft (5), wherein the lip seal ring (4) comprises a metal framework (41), a tightening spring (42) and a rubber seal body (43); one side of the metal framework (41) is an oil side, and the other side of the metal framework is an air side; the lip-shaped sealing ring (4) and the supporting frame (3) are fixedly connected on the gland (2) through bolts (21); a spiral diversion trench (31) is formed in the surface, matched with the support frame (3), of the rear lip angle inclined plane of the rubber sealing body (43); the cross section of the support frame (3) is L-shaped, the support frame is positioned on the air side, an air inlet hole (32) is formed in the inner circumferential surface which is close to the rotating shaft (5), an air outlet hole (33) is formed in the outer vertical surface which is close to the gland (2) and exposed in the air, and the air inlet hole (32) and the air outlet hole (33) are both positioned in the slotting interval of the inclined surface of the rear lip corner of the rubber sealing body (43); the gland (2) is fixed on the end cover (1) through a screw (11); the surface of the rotating shaft (5) close to the air side of the lip-shaped sealing ring (4) is provided with a pair of first spiral micro-grooves (51) and second spiral micro-grooves (52) which are opposite in turning direction, wherein the turning direction of the first spiral micro-grooves (51) close to the lip mouth is the same as the turning direction of the rotating shaft (5), the turning direction of the second spiral micro-grooves (52) far away from the lip mouth is opposite to the turning direction of the rotating shaft (5), and the groove depth and the groove width of the first spiral micro-grooves (51) and the second spiral micro-grooves (52) are gradually reduced along the spiral line direction.
2. A forced convection heat transfer wear resistant rotary shaft lip seal as claimed in claim 1 wherein: the openings of the air inlet hole (32) and the air outlet hole (33) are circular openings, and the diameters of the openings are respectively set as dinAnd dout(ii) a D isinAnd doutThe size of the three is related to the diameter D of the rotating shaft, and the relationship among the three is as follows: dout=0.6~0.8din,din=0.03~0.1D。
3. A forced convection heat exchange, wear resistant rotary shaft lip seal as claimed in claim 2 wherein: spiral diversion trenches (31) are formed in the surfaces, matched with the inclined surfaces of the rear lip corners of the rubber sealing bodies (43), of the supporting frame (3), and the rotation direction of each spiral diversion trench (31) is opposite to that of the rotating shaft (5).
4. A forced convection heat transfer wear resistant rotary shaft lip seal assembly as claimed in claim 3 wherein: the cross section of the first spiral micro-groove (51), the cross section of the second spiral micro-groove (52) and the cross section of the spiral diversion trench (31) are in one shape of a rectangle, a triangle, a trapezoid and an arc.
CN201810989807.0A 2018-08-28 2018-08-28 Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange Active CN109058463B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810989807.0A CN109058463B (en) 2018-08-28 2018-08-28 Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810989807.0A CN109058463B (en) 2018-08-28 2018-08-28 Wear-resistant rotary shaft lip-shaped sealing ring device for forced convection heat exchange

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CN109058463A CN109058463A (en) 2018-12-21
CN109058463B true CN109058463B (en) 2019-12-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111895094B (en) * 2020-06-22 2022-09-13 东风柳州汽车有限公司 Oil sealing structure for automobile engine

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* Cited by examiner, † Cited by third party
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CN202834078U (en) * 2012-09-14 2013-03-27 青岛开世密封工业有限公司 Active heat dissipation sealing ring with dustproof function
DE102015224418A1 (en) * 2015-12-07 2017-06-08 Schaeffler Technologies AG & Co. KG Seal with protective / centrifugal and sealing washer for sealing multi-row roller bearings for rolling mill stands
DE102015226705A1 (en) * 2015-12-23 2017-06-29 Trelleborg Sealing Solutions Germany Gmbh Sealing arrangement with sealing foil
JP2017223283A (en) * 2016-06-15 2017-12-21 Ntn株式会社 Bearing device
CN209340507U (en) * 2018-08-28 2019-09-03 浙江工业大学 A kind of wear-resisting type rotating shaft lip-shaped sealing device of forced-convection heat transfer

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