CN214699195U - Variable cross-section rotary sealing structure - Google Patents
Variable cross-section rotary sealing structure Download PDFInfo
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- CN214699195U CN214699195U CN202120344670.0U CN202120344670U CN214699195U CN 214699195 U CN214699195 U CN 214699195U CN 202120344670 U CN202120344670 U CN 202120344670U CN 214699195 U CN214699195 U CN 214699195U
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Abstract
The utility model provides a rotary sealing structure, which is used for establishing a sealing relation between an installation body and a rotating shaft; the rotary seal structure includes: a support body and a sealing lip of a ring body structure; the sealing lip is of a variable cross-section structure, and the cross-sectional area is gradually reduced from the outer end to the inner end. The utility model provides a new-type structure seal structure, the cross-sectional area through the seal lip constantly reduces, guarantees from this that the axle power of embracing between seal lip and the pivot realizes the sealing function under different rotational speeds, pressure.
Description
Technical Field
The utility model belongs to the technical field of the rotary seal, concretely relates to rotary seal structure, its wide application has relative rotary motion's liquid and gas seal in various mechanical structure with the axle.
Background
The rotary sealing structure is a common part in mechanical parts and is widely applied to various operating mechanical structures. With the modern design level of mechanical structures and the progress of manufacturing technology, the functions of various mechanical structures are gradually increased, the volumes are gradually reduced, and the requirements on rotary sealing elements in the mechanical structures are gradually increased. The installation space of the rotary sealing element is greatly compressed, and the requirements on the service life, the working temperature and the like of the rotary sealing element are relatively improved. In many cases, it is also necessary for the rotary seal to be able to seal bidirectionally with one side sealing liquid and one side sealing gas in a small installation size. The development and progress of the mechanical structure urgently needs the innovative rotary sealing structure with small size and high sealing performance.
Traditional rotary seal structure is rubber seal lip usually, and the cooperation provides the pretightning force with ordinary spring assembly, makes rubber seal lip tightly laminate to the rotation axis on, forms sealed face, realizes the rotary seal function, and this kind of rubber rotary seal structure mainly has following not enough: it is difficult to achieve bidirectional sealing in a small installation size, for example, one side is sealed with lubricating oil and the other side is sealed with pressure gas. Conventional rubber rotary seals are generally unidirectional due to structural limitations of the rubber seal lip. In order to realize bidirectional sealing, a rubber sealing lip is required to be additionally arranged in a reverse mode, so that the requirement on the installation space of the sealing element is greatly increased, and the traditional rubber rotary sealing element is difficult to use in the occasions with small space and the requirement on bidirectional rotary sealing. ② the service life is short. The traditional rubber rotary seal is provided with pretightening force by a spring, so that a rubber seal lip is in close contact with a rotating shaft, the rotating shaft is usually made of metal materials, and the rubber seal lip is greatly abraded along with the rubber seal lip in the rotating process of the shaft due to the fact that the friction force between the rubber material and the metal materials is large, and the service life of the rotary seal is influenced. And the working temperature range is narrow. Because the high and low temperature resistance of the rubber material is poor and the high and low temperature resistance can not be considered, the traditional rubber sealing element is difficult to be sufficient in the use occasions with wide temperature change range. And fourthly, the traditional rubber sealing element has high requirement on lubrication. Because rubber materials and metal materials generate friction in the rotary sealing process, a lubricating agent is required to lubricate a sealing surface, otherwise, a rubber sealing lip is quickly worn or generates high temperature, so that the sealing function is lost. The dependence of conventional rubber seals on lubricants is therefore high.
CN105626870A provides a new rotary seal structure of bidirectional seal, see fig. 1, for establishing a sealing relationship between a mounting body (7) and a rotary shaft (6); the rotary seal structure includes: the device comprises a support body (1) with a ring body structure, a first sealing lip (2), a second sealing lip (3), a rebound device (4) and an O-shaped ring (5);
a first annular groove is formed in the outer surface of the ring body of the support body (1), and the O-shaped ring (5) is installed in the first annular groove;
the outer surface of the ring body of the support body (1) and the inner surface of the mounting body (7) are mounted together, relative rotation is avoided between the outer surface of the ring body and the inner surface, and static sealing is realized through the O-shaped ring (5);
the rebound device (4), the first sealing lip (2) and the second sealing lip (3) are arranged to be of circular ring structures with elastic characteristics; a second annular groove is formed in the inner surface of the ring body of the support body (1), and the outer side ends of the rebound device (4), the first sealing lip (2) and the second sealing lip (3) are tightly pressed and installed in the second annular groove; the connection between the springback device (4), the first sealing lip (2), the second sealing lip (3) and the support body (1) is sealed under moderate pressing force; gas or liquid cannot pass through the connecting portion therebetween;
the inner side ends of the ring structures of the rebounding device (4), the first sealing lip (2) and the second sealing lip (3) penetrate into the rotating shaft (6) so as to be assembled with the rotating shaft (6), and the inner side ends of the first sealing lip (2) and the second sealing lip (3) deform to be tightly attached to the rotating shaft (6); the rebound device (4) is arranged on the first sealing lip (2) and also deforms to generate a rebound force, so that the first sealing lip (2) is more tightly attached to the rotating shaft (6), a rotary dynamic sealing surface is formed, rotary dynamic sealing is realized, one side is sealed with liquid, and the other side is sealed with gas;
the rotary seal structure forms a complete seal from the mounting body (7) to the rotary shaft (6); due to the rotary sealing structure, gas or liquid cannot move to the other side through the gap between the mounting body (7) and the rotating shaft (6), and a rotary dynamic sealing function is realized.
CN105626870A can obtain: small installation size, long service life, wide applicable temperature range and low requirement on lubricating conditions.
However, in practical application, the problem that the quality stability of products is caused by inconsistent installation is found, so the research and development team carries out further research and development and improvement on the rotary sealing structure so as to overcome the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a new sealing structure to solve the preceding technical problem who appears.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
a rotary seal structure for establishing a sealing relationship between a mounting body and a rotating shaft; the rotary seal structure includes: a support body and a sealing lip of a ring body structure; the outer surface of the ring body of the support body and the inner surface of the mounting body are mounted together, and relative rotation is avoided between the outer surface of the ring body of the support body and the inner surface of the mounting body; the sealing lip is of a circular ring structure with elastic property; the inner surface of the ring body of the support body is provided with an annular groove, and the outer side ends of the sealing lips are tightly pressed and installed in the annular groove;
the inner side end of the circular ring structure of the sealing lip penetrates into the rotating shaft so as to be assembled with the rotating shaft, the inner side end deforms and is tightly close to the rotating shaft, a rotary dynamic sealing surface is formed, rotary dynamic sealing is realized, one side of the sealing lip seals liquid, and the other side of the sealing lip seals gas;
the sealing lip is of a variable cross-section structure, and the cross-sectional area is gradually reduced from the outer end to the inner end.
Preferably, the sealing lip after being mounted has a curved structure, and the inner end extends in a curved manner toward the gas side.
Preferably, the cross-sectional area decreases by an increasing amount in a direction from the outer end to the inner end.
Preferably, the cross-sectional area varies according to the following law:
the sealing surface of the liquid side is in an arc structure, a point on the arc structure is called a liquid side point, a connecting point of a connecting line of the liquid side point and the circle center on a gas side curve is called a gas side point, the distance of the connecting line between the liquid side point and the gas side point becomes the width, and the width change rule is as follows:
the length of the arc structure is L, and the width of the outermost end of the arc structure is KOuter coverThen, along the inward bending direction of the circular arc structure, the K law that the distance from the outermost arc of the circular arc to the l position is as follows: k ═ b ═ KOuter cover+c*KOuter cover*（l/L）aWherein a, b and c are coefficients, and the following requirements are met:
1.085<a<1.107,0.988<b+c<1.011，0.495<b<0.628。
preferably, a gradually decreases as L/L increases.
Preferably, 0.094< a <1.101, b + c =1, 0.563< b < 0.575.
Preferably, the width of the outer end is 4mm and the width of the inner end is 1.2 mm.
Compared with the prior art, the utility model discloses following advantage has:
1) the utility model provides a new-type structure seal structure, the cross-sectional area through the seal lip constantly reduces, guarantees from this that the axle power of embracing between seal lip and the pivot realizes the sealing function under different rotational speeds, pressure.
2) The utility model discloses the size of pressure design O type sealing rubber circle according to area pressure medium realizes by O type sealing rubber circle pretension, presses sealing medium dynamic balance's high pressure rotary seal function. The sealing device can realize a more reasonable lip structure in a high-pressure sealing medium state, and a smaller sealing surface has lower friction and energy consumption. The sealing device can be used in back-to-back pairs to realize high-pressure liquid bidirectional sealing. Unlike traditional PTFE lip seals, the sealing medium is under pressure on the back side of the lip. The high-pressure liquid seal device is more suitable for realizing liquid seal under pressure under the working conditions that high pressure is required (such as more than 30 bar) and upper leakage quantity is smaller (less than 1 ml/h).
3) The utility model discloses a set up the controllability that the volume of compression of the sealed lip of control that the threaded inside and outside supporting body structure can be more accurate realizes sealed data, can realize the seal structure under the incomplete dismantlement state simultaneously and change, solve in the CN105626870A because of the product withhold the shaping in-process sealed lip inefficacy and lead to sealing device whole change problem.
4) The utility model discloses a set up and support the lip, after increasing to support the lip, promoted the anti lip ability of turning over of sealed lip resistance to compression, limit compressive capacity promotes 43%.
5) The utility model discloses a sealed face of lip seal sets up to open has a plurality of concentric wedge grooves, under sealed low pressure liquid medium operating mode, according to the pump this structure of mechanism of suction can last to suck back the liquid side from the liquid pump that sealed face revealed, reduce the volume of revealing, thereby reduce sealed face and rotation axis effective contact surface simultaneously, thereby reduce friction extension sealing device life. 5) The utility model provides a new-type structure seal structure, the cross-sectional area through the seal lip constantly reduces, guarantees from this that the axle power of embracing between seal lip and the pivot realizes the sealing function under different rotational speeds, pressure.
6) The utility model discloses a separate certain distance form rotatory dynamic seal face in two seal lip departments, can realize one side seal lubricating oil, one side function of preventing dust.
Drawings
Fig. 1 is a schematic view of a sealing structure of the prior art of the present invention.
Fig. 2 is a schematic view of a first embodiment of the improved sealing structure of the present invention.
Fig. 3 is a schematic view of a second embodiment of the improved sealing structure of the present invention.
Fig. 4 is a schematic view of a third embodiment of the improved sealing structure of the present invention.
Fig. 5 is a schematic view of a fourth embodiment of the improved sealing structure of the present invention.
Fig. 6 is a schematic view of a fifth embodiment of the improved sealing structure of the present invention.
Fig. 7 is a schematic view of a sixth embodiment of the improved sealing structure of the present invention.
Fig. 8 is a schematic view of a seventh embodiment of the improved sealing structure of the present invention.
In the figure: 1. a support body; 2. a first sealing lip; 3. a second sealing lip; 4. a rebounding device; sealing the rubber ring by O; 6. a rotating shaft; 7. the device comprises a mounting body, 8 sealing lips, 9 supporting lips, 10 sealing lip gaskets, 11 outer supporting bodies, 12 inner supporting bodies, 13 dustproof lips, 14 wedge-shaped pumping structures and 15 retaining rings.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 2, a rotary seal structure for establishing a sealing relationship between a mounting body 7 and a rotary shaft 6; the rotary seal structure includes: a support body 1 with a ring structure and a sealing lip 8;
the outer surface of the ring body of the support body and the inner surface of the mounting body are mounted together, and relative rotation is avoided between the outer surface of the ring body of the support body and the inner surface of the mounting body;
the sealing lip 8 is of a circular ring structure with elastic property; an annular groove is formed in the inner surface of the ring body of the support body 1, and the outer side ends of the sealing lips 8 are tightly pressed and installed in the annular groove; the connection between the sealing lip 8 and the support body is sealed under moderate pressing forces; gas or liquid cannot pass through the connecting portion therebetween;
the inner side end of the ring structure of the sealing lip 8 penetrates into the rotating shaft 6 so as to be assembled with the rotating shaft 6, and the inner side end of the sealing lip 8 deforms and is tightly held with the rotating shaft so as to form a rotary dynamic sealing surface, so that rotary dynamic sealing, liquid sealing or gas sealing is realized;
the rotary seal structure forms a complete seal from the mounting body 7 to the rotary shaft 6; due to the rotary sealing structure, gas or liquid cannot move to the other side through the gap between the mounting body 7 and the rotating shaft 6, and a rotary dynamic sealing function is realized.
As a modification, the sealing lip 8 has a variable cross-sectional structure as shown in fig. 2, and the cross-sectional area gradually decreases from the outer end to the inner end. The cross-sectional area of the sealing lip 8 is continuously reduced, so that the shaft holding force between the sealing lip 1 and the rotating shaft is ensured to realize the sealing function under different rotating speeds and pressures. The structure adopts a physical structure with the variable cross section and the gradually-changed thickness of the lip mouth, so that the axle-holding preloading force of the lip mouth and the sealed axle-holding contact area for avoiding the warping of the lip mouth can be ensured. And through setting up the unilateral seal lip, compare with the prior art of figure 1, save material and cost more, it is convenient to make, realizes better sealed effect moreover.
If the sealing surface belt is under the pressure rotating working condition, if no corresponding support exists, the curling sealing surface can separate from the pressure medium of the rotating shaft sealing belt, so that the sealing effect can be enhanced, but once the PTFE plastic deformation and expansion coefficient balance point is exceeded, on one hand, the friction loss of the sealing surface is increased, and on the other hand, the curling of the sealing surface is caused to cause sealing failure. The traditional rigid support for preventing the sealing surface from being curled and mounted behind the sealing sheet can be simplified through the variable cross section, and the optimal sealing state under different pressures is realized.
Through experiments, the variable cross-section structure is compared with the non-variable cross-section structure, the pre-load force of the axle is increased by 25%, and the contact area of the axle is increased by 38%. For example, the sealing performance of the rubber sealing is equivalent to that of the traditional rubber sealing under the pressure of about 25bar at the same rotating speed and the sealing performance of about 10 bar.
Preferably, the seal lip 8 after mounting is of a curved structure, and the inner end extends in a curved manner toward the sealing medium side. Through so setting up, guarantee the 8 seal areas of seal lip of sealing medium side and increase to further realize the gas-liquid seal effect.
Preferably, the cross-sectional area decreases by an increasing amount in a direction from the outer end to the inner end. Through setting up the continuous less range of cross-sectional area and constantly increasing, can further satisfy better sealed, can improve 5% sealed effect.
Preferably, the cross-sectional area varies according to the following law:
the outer end surface (sealing surface) of the liquid side is of an arc structure, a point on the arc structure becomes a liquid side point, a connecting line between the liquid side point and the circle center becomes a gas side point at a connecting point of a gas side curve, and a connecting line distance between the liquid side point and the gas side point becomes a width, so that the width change law is as follows:
the length of the arc structure is L, and the width of the outermost end (the uppermost end) of the arc structure is KOuter coverThen, along the inward bending direction of the circular arc structure, the rule of the width K at the position l away from the outermost arc of the circular arc is as follows: k ═ b ═ KOuter cover+c*KOuter cover*（l/L）aWherein a, b and c are coefficients, and the following requirements are met:
1.085<a<1.107,0.988<b+c<1.011，0.495<b<0.628。
preferably, a gradually decreases as L/L increases.
Preferably, 1.094< a <1.101, b + c =1, 0.563< b < 0.575;
the optimized formula is obtained through a large number of experiments and numerical simulation, the sealing structure can achieve optimized distribution, heat distribution can be uniform on the whole, the heat exchange effect is good, and materials can be saved.
Preferably, the width of the outermost end is 4mm, and the width of the innermost end is 1.2 mm.
The arrangement of fig. 2 is equally applicable to the sealing arrangement of fig. 3-8. For example, the left (oil side) seal lips of fig. 5-7 are also applicable to the configuration of fig. 2. The pressurized sealing medium sealing lips of the other figures are also suitable for use in the construction of fig. 2.
As a modification, as shown in FIG. 3, a plurality of wedge-shaped groove pumping structures 14 are arranged on the outer end face of the liquid side sealing surface of the sealing lip 8, and the wedge-shaped grooves 14 are arranged concentrically with the liquid side sealing surface. The sealing surface of the sealing lip 8 is provided with a plurality of wedge-shaped groove pumping structures, and under the working condition of low-pressure sealing medium, the structures can continuously pump the liquid leaked to the sealing surface back to the liquid side according to a pumping mechanism, so that the leakage amount is further reduced. Specifically, a series of micro triangular sealing ring belts are formed in a sealing surface area through a sealing wedge-shaped groove structure, the included angle of the liquid side of each triangular sealing ring belt is larger than that of the gas side, liquid on two sides flows to the middle of a sealing surface under the action of a capillary effect, the effective area of the capillary on the different air sides of the included angles on the two sides is larger than that of the liquid side, so that the liquid flowing to the air side is continuously pumped back to the liquid side, and the series of triangular sealing ring belts form a pumping action.
Preferably, the annular grooves 14 are distributed with an increasing density from the outer end of the sealing lip 8 to the inner end. The main reason is that in research, the oil collecting amount is gradually increased towards the inner end direction at the outer end of the sealing lip 8, so that the oil pump of the sealing surface is more quickly and better sucked and returned to the oil side through the change of the distribution density of the annular groove, oil leakage is avoided, and meanwhile, a lubricating oil film of the sealing ring belt is ensured.
Preferably, the distribution density of the annular grooves 14 increases from the outer end to the inner end of the sealing lip 8. The above rule is also a regular change of the oil collection amount found through a large number of experiments and simulation researches, and is also an innovative research result of the application, and is not a routine means of a person skilled in the art. Through the change of the rule, the rule change of the oil collecting amount can be better applied, the oil suction and return side of an oil pump of the sealing surface is further improved, and oil leakage is avoided
The groove depth of the annular groove 14 increases from the outer end of the sealing lip 8 to the inner end. See in particular the variation in the distribution density of the annular grooves 14.
The groove depth of the annular groove 14 increases with increasing magnitude, preferably from the outer end to the inner end of the sealing lip 8. See in particular the variation in the distribution density of the annular grooves 14.
Preferably, the support is a metal material having a ring structure.
The fig. 3 configuration is equally applicable to the sealing medium (liquid side) outer end face of the sealing structure of fig. 2-8. For example, the sealing lip of fig. 5-7 (liquid side) is also applicable to the configuration of fig. 3, but the wedge-shaped groove pumping structure 14 of fig. 5-7 is provided on the outer end face of the liquid side, so that even if liquid enters the space between the sealing lip and the air sealing lip, the liquid will flow to the middle of the sealing surface on both sides due to capillary effect. The low pressure liquid side seal lips of the other figures are also applicable to the structure of fig. 3, in the same manner as in fig. 3.
Preferably, the wedge-shaped groove is an annular groove.
As a modification, as shown in fig. 4, the seal structure further includes a support lip 9, and the support lip 9 is provided with an outer end face on the liquid side of the seal lip 8. When the combination of the supporting lips 9 of the sealing lip 8 is pressed and installed in the annular groove on the inner surface of the supporting body, the combination of the supporting lips 9 of the sealing lip 8 deforms in the same direction under a moderate pressing force and is tightly attached to the rotating shaft, as shown in fig. 4. In operation, the sealing lip 8 and the rotating shaft rotate relatively to form a rotary dynamic sealing surface, and the sealing function of liquid or gas under pressure can be realized. The pressurized liquid or gas on one side of the mounting body cannot leak to the other side through the rotary sealing surface.
Through setting up support lip 9, increase and support lip 9 after, promoted 8 resistance to compression of seal lip and anti lip ability of turning over, limit resistance to compression promotes 43%. Under the rotatory operating mode of area pressure (generally when being greater than 10bar operating mode), sealed face back has not had the support measure and can appear sealed face to curl up sealed function inefficacy, adopts the support with the same material of seal lip, can form together with sealed anchor ring, and it is better to prevent to curl up the effect, prevents simultaneously that traditional metal-back from easily fish tail rotation axis problem.
Preferably, the outer end of the support lip 9 is aligned with the outer end of the sealing lip 8, and the inner end of the support lip 9 is at a distance from the sealing lip 8. Preferably, the length of the supporting lip 9 is 65% -75% of the length of the sealing lip 8, within the range, the pressure-bearing anti-overturn lip capability can be ensured, the safe distance between the supporting lip and the shaft can be ensured, and the increase of the shaft-holding load can be prevented.
As a modification, as shown in fig. 5, the support includes an outer support 11 and an inner support 12, a first sealing lip 2, a second sealing lip 3, and a sealing lip gasket 10, the outer support 11 is provided with an internal thread, and the inner support 12 is provided with an external thread. The inner support body 12 provided with the external thread is screwed in the inner hole of the outer support body 11 provided with the internal thread, and the first sealing lip 2 and the second sealing lip 3 are combined and tightly pressed and installed in the annular groove between the inner support body and the outer support body through the lip sealing gasket 10. The utility model discloses a sealing lip adopts the polytetrafluoroethylene material, and the structure is annular thin slice of circle, and the metal material ring structure of inside and outside supporter for setting up the screw thread. The sealing gasket 10 is an O-shaped sealing rubber ring. The utility model discloses easy to assemble dismantles, and partial component can reuse, and the product replacement cost is lower. Simultaneously, the problem of product overall replacement caused by the fact that the product is not accurately buckled and formed and the sealing surface fails is solved. Preferably, the sealing lip gasket 10 is made of teflon, and has a regular hexahedral shape. To ensure a sealing contact width between the outer supports 11, 12 and the lip.
Preferably, the outer diameter of the circumscribed circle of the seal lip gasket 10 matches the inner diameter of the outer support.
The first sealing lip 2 and the second sealing lip 3 are combined and screwed into an annular groove on the inner surface of the support body shown in fig. 5 through an outer support body and an inner support body which are provided with internal and external threads through a sealing lip gasket 10, and under a moderate pressing force, the first sealing lip 2 and the second sealing lip 3 are combined and deformed in the same direction to be tightly attached to the rotating shaft shown in fig. 5. During work, the combination of the sealing lip 2 and the sealing lip 3 and the rotating shaft rotate relatively to form a rotary dynamic sealing surface, so that the sealing function of sealing liquid at one side and sealing gas at the other side can be realized. Liquid on one side of the mounting body cannot leak to a gas area on the other side through the rotary sealing surface; gas on the other side of the mounting body cannot leak to the liquid side region through the rotary sealing face.
According to the sealing characteristics, the support body structure provided with the threads can control the sealing product more accurately to realize controllability of sealing data. Simultaneously, the problem of product overall replacement caused by inaccurate sealing surface failure during product buckling and pressing molding is solved.
As a modification, as shown in fig. 6, the inner surface of the supporting body is provided with 2 adjacent annular grooves, the dust lip 13 and the sealing lip 8 are respectively pressed and mounted in the 2 annular grooves on the inner surface of the supporting body, under a moderate pressing force, the dust lip 13 and the sealing lip 8 deform in the same direction and tightly fit with the rotating shaft, and the connection between the dust lip 13 and the sealing lip 8 is sealed. The supporting body and the mounting body are statically sealed by a sealing ring or a sealant, relative rotation does not exist between the supporting body and the mounting body, and a rotary dynamic sealing surface is formed at the dustproof lip 13 and the sealing lip 8, so that lubricating oil can be sealed at one side, and the dustproof function at one side can be realized.
Preferably, the dust lip 13 is curved in the same direction as the seal lip 8, and both are directed toward the oil side chamber, as shown in fig. 6. In the sealing device for sealing oil on one side, dust particles and the like are sucked into the sealing surface to scratch the sealing surface and fail in the scheme of a sealing structure with a pumping principle, such as the scheme of fig. 3; the sealing lip is a main sealing surface; the dustproof lip is an auxiliary sealing surface, so that the failure and serious leakage of the main sealing surface are prevented, and meanwhile, the dustproof lip has the function of preventing foreign matters from being pumped into the main sealing ring surface when the main sealing ring surface has a pumping structure.
Preferably, the gradual change structure of fig. 2 can be adopted for the sealing lip 8 to prevent the lip from curling up under the working condition of the pressurized sealing medium.
Preferably, the dust lip 13 is curved in a different direction than the sealing lip 8, wherein the sealing lip 8 is directed towards the oil side chamber and the dust lip 13 is directed towards the air side chamber, as shown in fig. 7. The structure can ensure that certain shaft-holding preloading capacity is kept under the action of external pressurized gas, so that the dustproof and dustproof effects are achieved. This sealing means is preferred to be applicable to one side seal oil, and the other side is sealed and is pressed the gas, prevents that the dust particle from getting into the oil ring sealing strip when the oil seal face has the pump structure simultaneously.
It is important to note that if the dust-proof side is provided with pressurized gas (< 5 bar) and the partial section is shown in the attached figure 7, the sealing lip 8 and the dust-proof lip 13 deform reversely and tightly fit with the rotating shaft shown in the figure. One side of the sealing liquid is sealed, and one side of the sealing gas has a dustproof function. The gas and floating dust on the left side of the mounting body cannot leak to the lubricating oil area on the right side of the mounting body through the sealing structure between the mounting body and the rotating shaft, and the lubricating oil cannot leak to the gas area through the sealing structure between the mounting body and the rotating shaft.
As a modification, as shown in fig. 8, a PTFE reverse lip rotary seal structure for establishing a sealing relationship between a mounting body and a rotary shaft. The rotary sealing structure comprises an O-shaped sealing rubber ring 5 and a retainer ring 15; the supporting body comprises an inner supporting body 12 and an outer supporting body 11, the inner supporting body is arranged at the lower part of the outer supporting body and is tightly pressed in an inner hole of the outer supporting body, the inner supporting body and the outer supporting body comprise downward extending parts, an annular groove is formed between the downward extending parts, and the upper end of the sealing lip 8 is fixed in the annular groove; the O-shaped sealing rubber ring abuts against one surface, close to the atmosphere side, of the inner support body in the sealing lip in the inner radial direction through the check ring, a sealing space is formed among the O-shaped sealing rubber ring, the sealing lip, the check ring and the inner support body, the sealing lip is provided with a through groove communicated with the sealing space, and the sealing space is filled with sealing media through the through groove.
The inner support body is tightly pressed in an inner hole of the outer support body, and an annular groove is formed by interference fit to fix the upper end of the sealing lip 8 in the annular groove. And a through groove is formed in the sealing lip 8 along the inner circle of the inner and outer support bodies. The O-shaped sealing rubber ring is arranged on one side, close to the atmosphere, of the sealing lip 8, preferably is seated on the sealing lip 8 through a check ring, and abuts against the lower end of the inner support body. The O-shaped sealing rubber ring is provided with a certain preload according to the pressure of the sealing medium, and the sealing medium is statically prevented from leaking on the sealing surface. And sealing medium is filled above the O-shaped sealing rubber ring through the discontinuous through groove of the sealing lip. The retainer ring is arranged on the opposite side of the O-shaped sealing rubber ring in contact with the sealing lip 8 and is pressed against the opposite side of the O-shaped sealing rubber ring. Preferably, the retainer ring is connected to the inner support body and extends downwardly from the inner support body. The utility model discloses the size of pressure design O type sealing rubber circle according to area pressure medium realizes by O type sealing rubber pretension, presses sealing medium dynamic balance's high pressure rotary seal function. The sealing device can realize a more reasonable lip structure in a high-pressure sealing medium state, and a smaller sealing surface has lower friction and energy consumption, so that the service life is longer. The sealing device can be used in back-to-back pairs to realize high-pressure liquid bidirectional sealing. Unlike traditional PTFE lip seals, the sealing medium is under pressure on the back side of the lip. The high-pressure liquid seal device is more suitable for realizing liquid seal under pressure under the working conditions that high pressure is required (such as more than 30 bar) and upper leakage quantity is smaller (less than 1 ml/h).
Preferably, all of the above modifications may be combined together in at least two. For example, the outer end of the sealing lip 8 is the oil side, and the outer end can be provided with an annular groove. The sealing lip 8 may be of variable cross-section construction or the like.
Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (7)
1. A rotary seal structure for establishing a sealing relationship between a mounting body and a rotating shaft; the rotary seal structure includes: a support body and a sealing lip of a ring body structure; the outer surface of the ring body of the support body and the inner surface of the mounting body are mounted together, and relative rotation is avoided between the outer surface of the ring body of the support body and the inner surface of the mounting body; the sealing lip is of a circular ring structure with elastic property;
the inner side end of the circular ring structure of the sealing lip penetrates into the rotating shaft so as to be assembled with the rotating shaft, the inner side end deforms and is tightly close to the rotating shaft, a rotary dynamic sealing surface is formed, rotary dynamic sealing is realized, one side of the sealing lip seals liquid, and the other side of the sealing lip seals gas;
the sealing lip is characterized in that the sealing lip is of a variable-section structure, and the cross-sectional area is gradually reduced from the outer end to the inner end.
2. The rotary seal structure according to claim 1, wherein the seal lip after being mounted is a curved structure, and the inner end is curved to extend toward the gas side.
3. The rotary seal structure of claim 1, wherein said cross-sectional area decreases by an increasing amount in a direction from the outer end to the inner end.
4. The rotary seal structure of claim 2, said cross-sectional area varying according to the following law:
the sealing surface of the liquid side is in an arc structure, a point on the arc structure is called a liquid side point, a connecting point of a connecting line of the liquid side point and the circle center on a gas side curve is called a gas side point, the distance of the connecting line between the liquid side point and the gas side point becomes the width, and the width change rule is as follows:
the length of the arc structure is L, and the width of the outermost end of the arc structure is KOuter coverThen, along the inward bending direction of the circular arc structure, the K law that the distance from the outermost arc of the circular arc to the l position is as follows: k ═ b ═ KOuter cover+c*KOuter cover*（l/L）aWherein a, b and c are coefficients, and the following requirements are met:
1.085<a<1.107,0.988<b+c<1.011，0.495<b<0.628。
5. the rotary seal structure of claim 4, wherein a gradually decreases as L/L increases.
6. The rotary seal structure of claim 4, wherein 0.094< a <1.101, b + c =1, 0.563< b < 0.575.
7. The rotary seal structure of claim 4, wherein the width of the outer end is 4mm and the width of the inner end is 1.2 mm.
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