CN214368409U - Sealing bush - Google Patents

Abstract

The utility model provides a sealing bush, which comprises a cylindrical supporting body and an elastic sealing part attached to the outer annular surface or the inner annular surface of the supporting body, wherein the elastic sealing part comprises two elastic sealing surfaces which are respectively arranged at the two ends of the supporting body and a middle waist which is positioned between the two elastic sealing surfaces, and the middle waist is inwards sunken relative to the two elastic sealing surfaces; the two elastic sealing surfaces are rotationally symmetrical about the longitudinal axis of the support body; in any longitudinal section, the two elastic sealing surfaces are both in the shape of an ellipse, the long axis of the ellipse is perpendicular to the longitudinal axis of the support body, and the short axis of the ellipse is coincident with the longitudinal axis of the support body. The utility model discloses a sealed bush allows to treat that the longitudinal axis of connecting the pipeline has great dislocation deviation, and sealing stability is better, and has reduced the requirement of joining in marriage of treating connecting tube, and manufacturing cost obtains reducing.

Description

Sealing bush

Technical Field

The utility model relates to a pipe-line sealing connects technical field, concretely relates to seal bush.

Background

The sealing bush is mainly used for sealing and connecting two pipelines which need to be communicated with each other, has wide application and is mainly applied to an oil duct, a water channel and an air passage of connecting equipment.

The main structure of the seal bush includes a support body made of a rigid material, and a seal member of an elastic material such as rubber attached by overmolding to an outer annular surface or an inner annular surface of the support body. The usual mounting method is: the two ends of the sealing bush are respectively inserted into the seat holes of two pipelines to be connected or directly inserted into the pipeline joint, the rigid pipeline and the supporting body extrude the middle sealing part to deform, a sealing surface is formed between the pipeline and the sealing part, and the sealing bush can play a role in sealing connection as long as the pressure of fluid is less than that of the sealing surface.

When the existing sealing bush is installed on a pipeline seat hole or a pipeline joint, the longitudinal axes of pipelines on two sides are allowed to have certain dislocation, namely, the phenomenon of misalignment is allowed, and the sealing bush offsets the influence caused by the fact that the axes of the pipelines are staggered by a certain angle or distance through the structure of the sealing bush. Although the conventional sealing bush can allow the longitudinal axes of the pipelines at two sides to be misaligned, the misalignment deviation allowed by the structure of the sealing bush is small, and therefore when the longitudinal axes of the two pipelines to be connected have large misalignment deviation, the sealing effect of the sealing bush is reduced, and the situation of unstable sealing is easy to occur.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a sealing bush can allow the longitudinal axis that the connecting tube was treated in both sides to have great dislocation deviation, has guaranteed sealing stability, and has reduced the requirement of joining in marriage of treating the connecting tube, and manufacturing cost obtains reducing.

In order to achieve the above object, the present invention provides a seal bushing for sealing two pipes which need to be communicated with each other, the seal bushing comprising: a cylindrical support body and an elastic sealing member attached to an outer annular surface or an inner annular surface of the support body;

the elastic sealing component comprises two elastic sealing surfaces and a middle waist; the two elastic sealing surfaces are respectively arranged at two ends of the supporting body; the middle waist is positioned between the two elastic sealing surfaces and is inwards sunken relative to the two elastic sealing surfaces;

the two elastic sealing surfaces are rotationally symmetrical about the longitudinal axis of the support body; in any longitudinal section, the two elastic sealing surfaces are both in the shape of an ellipse, the long axis of the ellipse is perpendicular to the longitudinal axis of the support body, and the short axis of the ellipse is coincident with the longitudinal axis of the support body.

Optionally, the focal length of the ellipse is 40% to 65% of the major axis.

Optionally, the maximum thickness of the resilient sealing surface is 25% to 30% of the major axis of the ellipse.

Optionally, the middle waist and the two elastic sealing surfaces are integrally formed, and a transition fillet is arranged in a transition area between the middle waist and the two elastic sealing surfaces.

Optionally, the elastic sealing part further includes a skirt, the skirt is disposed on the middle waist, a surface of the skirt facing away from the support body is an arc-shaped curved surface, and a projection diameter of the skirt on the support body in the transverse direction is larger than a projection diameter of the elastic sealing surface.

Optionally, the elastic sealing part comprises two half-ear-shaped skirts, and the two skirts are oppositely arranged at intervals; alternatively, the resilient sealing member comprises a full ear skirt.

Optionally, the resilient sealing surface has apertures therein.

Optionally, the aperture is tubular and has an opening through a surface of the resilient sealing surface, the opening being located on a side of the resilient sealing surface adjacent the medial waist, the aperture extending from the opening towards an inner center of the resilient sealing surface.

Optionally, the elastic sealing surface has a plurality of pores therein, and the pores are uniformly distributed along the circumferential direction of the elastic sealing surface.

Optionally, the support is a spring or a bellows.

The utility model discloses a sealed bush includes the supporter and attaches to the elastic sealing part on the interior anchor ring or the outer anchor ring of supporter, sealed bush's both ends are used for respectively with a pipe connection, and by elastic sealing part in the middle of supporter and the pipeline extrusion forms sealed face. Elastic sealing part is including setting up respectively in two elastic sealing face at supporter both ends, every elastic sealing face about the longitudinal axis rotational symmetry of supporter, and on arbitrary longitudinal section, two the shape of elastic sealing face is oval, just oval-shaped major axis with the longitudinal axis of supporter is perpendicular, oval-shaped minor axis with the longitudinal axis coincidence of supporter. According to the sealing bush, due to the fact that the elastic sealing surface is designed to be of the oval structure, even if large dislocation deviation exists between the longitudinal axes of the pipelines to be connected on the two sides of the sealing bush, the sealing effect of the sealing bush can be guaranteed, the sealing stability of the sealing bush is good, the requirement for matching precision of the pipelines to be connected is lowered, and production cost is reduced.

Further, the elastic sealing part preferably further comprises a skirt, wherein the skirt is located at the middle waist of the elastic sealing part and used for blocking water and dust from entering between the adjacent two elastic sealing surfaces and the contact surface of the pipeline, so that the pipeline is prevented from being corroded, and the sealing time limit is prolonged.

Further, the support is preferably a spring or a bellows. Because spring and bellows have the characteristic that the atress inwards contracts, adopt the sealed bush of spring or bellows structure supporter to carry out the mould opening mode of drawing of patterns by force, promoted production efficiency. In addition, based on the characteristic, when the sealing bush is installed, the required pressing-in force is greatly reduced, and the installation efficiency is improved. In addition, because the spring and the corrugated pipe have certain flexibility, larger misalignment deviation of the longitudinal axes of the two pipelines to be connected can be allowed, good sealing can be formed, and the sealing stability is better.

Drawings

Fig. 1 is a schematic longitudinal sectional view of a seal bush according to a first embodiment of the present invention;

fig. 2 is a schematic view showing the distribution of pores in a seal cartridge according to a first embodiment of the present invention;

fig. 3 is a schematic longitudinal sectional view of a seal bush according to a second embodiment of the present invention;

fig. 4 is a schematic structural view of a seal bushing according to a third embodiment of the present invention.

Description of reference numerals:

1-support body, 2-elastic sealing component, 21-elastic sealing surface, 22-transition fillet, 23-middle waist, 24-pore, 25-skirt edge, 26-ellipse and 27-groove.

Detailed Description

As background, the inventor has found that the existing sealing bush allows a certain misalignment of the longitudinal axes of pipes to be connected on both sides of the sealing bush, i.e. allows misalignment, but allows a small misalignment, and is prone to unstable sealing.

Particularly, in present seal bush, the seal part is designed into the sealed uplift of two balls, sealed uplift is equivalent to the utility model discloses an elasticity vice lip for when seal bush is installed on pipeline seat hole or pipeline joint, the longitudinal axis of allowing both sides pipeline has certain dislocation, is exactly because the existence of the sealed uplift of ball shape structure, makes seal bush can offset the influence that pipeline longitudinal axis staggers certain angle or distance and bring each other through self crooked. But the dislocation deviation that the sealing uplift of ball shape structure can be allowed is less, and the sealing stability of the sealing bush of the design through ball shape sealing uplift is only a little higher than the sealing bush of ordinary arc uplift design, but the preparation degree of difficulty rises, leads to the manufacturing cost and the effect of sealing bush to mismatch.

Based on the above research, the present invention provides a sealing bushing, which includes a cylindrical support body and an elastic sealing member attached to an outer annular surface or an inner annular surface of the support body; the elastic sealing component comprises two elastic sealing surfaces and a middle waist; the two elastic sealing surfaces are respectively arranged at two ends of the supporting body; the middle waist is positioned between the two elastic sealing surfaces and is inwards sunken relative to the two elastic sealing surfaces; the two elastic sealing surfaces are rotationally symmetrical about the longitudinal axis of the support body; in any longitudinal section, the two elastic sealing surfaces are both in the shape of an ellipse, the long axis of the ellipse is perpendicular to the longitudinal axis of the support body, and the short axis of the ellipse is coincident with the longitudinal axis of the support body. Compared with the existing spherical sealing bulge structure, the two elastic sealing surfaces are designed in an oval structure, so that the longitudinal axis of the pipeline to be connected on the two sides of the sealing bush can be allowed to have larger deviation, a better sealing effect can still be ensured under the condition, the sealing stability of the sealing bush is good, the requirement on matching precision of the pipeline to be connected is reduced, and the production cost is reduced.

In order to make the disclosure of the present invention more comprehensible, the present invention is further described below with reference to fig. 1 to 4 and preferred embodiments. It is to be understood that the invention is not limited to the particular embodiments described below, and that general alternatives known to those skilled in the art are intended to be included within the scope of the invention. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

First embodiment

Fig. 1 is a longitudinal sectional view schematically showing a seal bushing 100 according to a first embodiment of the present invention. Referring to fig. 1, the sealing bush 100 of the present embodiment includes a supporting body 1 and an elastic sealing member 2. The support body 1 is cylindrical, and the elastic sealing member 2 may be attached to an outer circumferential surface or an inner circumferential surface of the support body 1. In the present embodiment, the elastic sealing member 2 is attached to the outer annular surface of the support body 1, and in the following description, the case will be exemplified.

The elastic sealing member 2 comprises two elastic sealing surfaces 21 and a middle waist 23; the two elastic sealing surfaces 21 are respectively arranged at two ends of the supporting body 1, and the middle waist 23 is positioned between the two elastic sealing surfaces 21 and is inwards sunken relative to the two elastic sealing surfaces 21. As shown in fig. 1, the medial waist 23 is recessed inward in the direction of the longitudinal axis of the support body 1.

The two elastic sealing surfaces 21 are rotationally symmetrical with respect to the longitudinal axis of the support body 1, and in any longitudinal section, both elastic sealing surfaces 21 are in the shape of an ellipse 26, the major axis of the ellipse 26 being perpendicular to the longitudinal axis of the support body 1, and the minor axis of the ellipse 26 coinciding with the longitudinal axis of the support body 1. Here, the longitudinal section is a section through the longitudinal axis of the support body 1. Herein, "vertical" and "coincident" are used merely for convenience in describing the orientation of the oval 26, and are not limited to absolute vertical and absolute coincident, and deviations within a certain degree of relative absolute vertical and absolute coincident are within the scope of the present invention, as would be understood by those skilled in the art.

The two elastic sealing surfaces 21 are used for being respectively inserted into seat holes of pipelines to be connected on two sides or on a pipeline joint, the supporting body 1 and the rigid pipeline extrude the elastic sealing surface 21 in the middle to form a sealing surface, and the sealing bushing 100 can play a role in sealing connection as long as the pressure of pipeline fluid is less than the pressure of the sealing surface. Compared with the sealing bulge structure with the existing spherical design, the two elastic sealing surfaces 21 are designed in an elliptical structure, so that larger deviation of the longitudinal axis of the pipeline to be connected on the two sides of the sealing bush 21 can be allowed, good sealing stability of the sealing bush 21 is ensured, the requirement on matching precision of the pipeline to be connected is reduced, and the production cost is reduced.

To ensure that the sealing bush 100 does not have the misassembly problem caused by the difference in the structural dimensions of the two ends when connecting two pipes, the curvilinear shape parameters of the two elastic sealing surfaces 21 are preferably identical (i.e., the structures are the same, including the shapes and the dimensions are the same), i.e., the two elastic sealing surfaces 21 are symmetrical with respect to the transverse central axis (i.e., the transverse axis, which is perpendicular to the longitudinal axis) of the sealing bush 100.

Further, the focal length of the oval 26 is preferably 40% to 65%, for example 50%, 55% or 60%, of the major axis, which allows for greater deviation of the longitudinal axes of the pipes to be connected on both sides and ensures the sealing performance of the sealing bush 100. When the ratio of the focal length to the major axis of the oval 26 is less than 40%, the curvature of the sealing area of the elastic sealing surface 21 for sealing is smaller, i.e. smoother, as the ratio decreases, and therefore the pressing force required for mounting the sealing bush 21 is smaller, but when the ratio of the focal length to the major axis is too small, the allowable deviation of the longitudinal axis of the pipe is reduced. When the ratio of the focal length to the major axis of the ellipse 26 is greater than 65%, the larger the ratio of the focal length to the major axis of the ellipse 26 is, the larger the curvature of the sealing area where the elastic sealing surface 21 performs the sealing function is, that is, the sharper the sealing area is, so that the elastic sealing material is excessively concentrated on both sides of the major axis of the ellipse 26, the transverse thickness is large, the sealing bushing 21 needs a larger pressing force when being installed, and the allowable deviation of the longitudinal axis of the pipeline is reduced, and the sealing stability is reduced.

Further, the maximum thickness of the resilient sealing surface 21 (i.e. the maximum ring width in the transverse direction of the support body 1) is 25% to 30% of the major axis of the oval shape 26, for example 26% or 28%. When the ratio of the maximum thickness to the long axis of the elastic sealing surface 21 is less than 25%, the pressing force required for mounting the sealing bush 21 is smaller as the ratio is smaller, but when the ratio of the maximum thickness to the long axis is too small, the permissible deviation of the longitudinal axis of the pipe is reduced. When the ratio of the maximum thickness to the long axis of the elastic sealing surface 21 is greater than 30%, the larger the ratio of the maximum thickness to the long axis, the greater the pressing force required for the installation of the sealing bush 21, and the permissible deviation of the pipe longitudinal axis is reduced, and the stability of the seal is reduced.

In the embodiment, the supporting member 1 is made of a rigid material, and the offset deviation of the longitudinal axes of the pipelines to be connected on the two sides is counteracted only by the inclination of the elastic sealing part 2. In other embodiments, the supporting member 1 may also have a certain elasticity, so that the misalignment of the longitudinal axes of the pipes to be connected on both sides can be offset by the skew of the elastic sealing member 2 and the supporting member 1, the sealing performance is better, and the detailed technical solution can refer to the third embodiment, which is not described herein again.

With continued reference to fig. 1, the middle waist 23 and the two elastic sealing surfaces 21 are preferably integrally formed, and the transition region between the two elastic sealing surfaces 21 is preferably provided with a transition fillet 22, the transition fillet 22 can ensure that the risk that the surface of the elastic sealing part 2 is scratched by a mold when the mold is demolded by the sealing bushing 100 is reduced, and the stress concentration at the transition region between the elastic sealing surfaces 21 and the middle waist 23 during assembly can be reduced, so that the service life of the part is prolonged.

Fig. 2 is a schematic view showing the distribution of the pores 24 of the seal bush 100 according to the first embodiment of the present invention. Referring to fig. 2, when the size of the entire seal bushing 100 is larger or the ratio of the focal length to the major axis of the ellipse 26 is larger, the thickness (i.e. the ring width in the transverse direction) of the elastic seal surface 21 is larger, so that the installation press-in force is larger, and at this time, the aperture 24 may be provided inside the elastic seal surface 21, so that the elastic seal surface 21 has a larger deformation space, and the required press-in force is greatly reduced.

Alternatively, the aperture 24 is tubular and has an opening through the surface of the resilient sealing surface 21, the opening being located on the side of the resilient sealing surface 21 adjacent to the waist 23, and the aperture 24 extends from the opening towards the inner center of the resilient sealing surface 21 to avoid the sealing surface of the support body 1 or the resilient sealing surface 21, so as not to affect the sealing performance of the support body 1 and the resilient sealing surface 21. Preferably, the elastic sealing surface 21 has a plurality of apertures 24 therein, and the plurality of apertures 24 are uniformly distributed along the circumferential direction of the elastic sealing surface 21 to reduce the installation pressing-in force applied to the elastic sealing surface 21 in a plurality of directions along the circumferential direction.

Second embodiment

Fig. 3 is a schematic longitudinal sectional view of a seal bush 200 according to a second embodiment of the present invention, and the same reference numerals are given to the same or similar structure as the first embodiment for the sake of simplicity.

As a modification of the first embodiment, as shown in fig. 3, the seal cartridge 200 of the present embodiment is similar in structure to the seal cartridge 100 of the first embodiment, and also includes a cylindrical support member 1 and an elastic seal member 2 attached to an outer circumferential surface or an inner circumferential surface of the support member 1. The elastic sealing member 2 likewise comprises two elastic sealing surfaces 21 and a central waist 23. The two elastic sealing surfaces 21 are respectively arranged at two ends of the supporting body 1, and the middle waist 23 is positioned between the two elastic sealing surfaces 21 and is inwards sunken relative to the two elastic sealing surfaces 21. Here, the medial waist 23 being inwardly depressed means being depressed toward the longitudinal axis direction of the support body 1. The two elastic sealing surfaces 21 are rotationally symmetrical with respect to the longitudinal axis of the support body 1, and in any longitudinal section, both elastic sealing surfaces 21 are oval in shape, corresponding to the oval shape 26 of the first embodiment, the major axis of the oval shape 26 being perpendicular to the longitudinal axis of the support body 1, and the minor axis of the oval shape 26 coinciding with the longitudinal axis of the support body 1. And the same or similar parts to those of the first embodiment, this embodiment will not be described in detail.

The difference from the first embodiment is that the elastic sealing part 2 of the present embodiment further includes a skirt 25, the skirt 25 is located at the middle waist 23, the surface of the skirt 25 facing away from the supporting body 1 is an arc-shaped curved surface, and the projected diameter in the transverse direction of the supporting body needs to be larger than the projected diameter of the elastic sealing surface 21, so as to ensure that a good seal can be formed even if the longitudinal axes of the pipes to be connected on both sides are not centered. When the pipeline connecting device is installed, the skirt 25 is located on the outer side of a pipeline to be connected relative to the elastic sealing surface 21, namely close to the opening of the pipeline, and the arc-shaped curved surface is used for being in sealing contact with the pipeline so as to prevent water and dust from entering between the elastic sealing surface 21 and the contact surface of the pipeline to be connected from the outer side of the pipeline, reduce corrosion of the surface of the pipeline and increase sealing time limit.

As shown in fig. 3, preferably, the number of the skirts 25 is two, each having a half-ear shape, the two skirts 25 are oppositely spaced, for example, having grooves 27, and the two skirts 25 are used to block water and dust from entering between the adjacent one of the elastic sealing surfaces 21 and the contact surface of the pipe to be connected, thereby reducing corrosion of the pipe surface and increasing the sealing time limit. In this embodiment, because the arc curved surfaces of two skirts 25 are spaced apart by recess 27 for every skirt 25 has great deformation space, and the required indentation force of installation is less, and can adapt to the shape change in sealed area better, and the contact surface with the pipeline is more laminated, and application scope is wider. In another embodiment, the skirt 25 is one in number and has a complete ear shape. The skirt 25 of the ear design requires a greater force to insert during installation than the half-ear design of this embodiment, but is more easily removed during manufacture.

It should be understood by those skilled in the art that the variations described in the first embodiment are also applicable to the second embodiment, and therefore, the present invention is within the protection scope of the present invention, and the detailed description is omitted here.

Third embodiment

Fig. 4 is a schematic structural view of a seal bushing 300 according to a third embodiment of the present invention, and for the sake of brevity, the same reference numerals are used for the same or similar structures as those of the first embodiment. As a modification of the first embodiment, as shown in fig. 4, the seal cartridge 300 of the present embodiment is similar in structure to the seal cartridge 100 of the first embodiment, and also includes a cylindrical support member 1 and an elastic seal member 2 attached to an outer circumferential surface or an inner circumferential surface of the support member 1. The elastic sealing member 2 likewise comprises two elastic sealing surfaces 21 and a central waist 23. The two elastic sealing surfaces 21 are respectively arranged at two ends of the supporting body 1, and the middle waist 23 is positioned between the two elastic sealing surfaces 21 and is inwards sunken relative to the two elastic sealing surfaces 21. Here, the medial waist 23 being inwardly depressed means being depressed toward the longitudinal axis direction of the support body 1. The two elastic sealing surfaces 21 are rotationally symmetrical with respect to the longitudinal axis of the support body 1, and in any longitudinal section, both elastic sealing surfaces 21 are oval in shape, corresponding to the oval shape 26 of the first embodiment, the major axis of the oval shape 26 being perpendicular to the longitudinal axis of the support body 1, and the minor axis of the oval shape 26 coinciding with the longitudinal axis of the support body 1. And the same or similar parts to those of the first embodiment, this embodiment will not be described in detail.

The difference from the first embodiment is that the support 1 of the present embodiment has a certain elasticity, preferably a spring or a bellows. During the preparation, because spring and bellows have the characteristic that the atress inwards contracts, adopt spring or bellows structure supporter 1's seal bush 300 can carry out the mould opening mode of strong drawing of patterns, promoted production efficiency. In addition, due to the characteristics, the required press-in force is greatly reduced when the sealing bush 300 is installed, and the installation efficiency is improved. Furthermore, because the spring or the bellows has a certain degree of flexibility, larger offset deviations of the longitudinal axes of the two pipes to be connected can be allowed, which also greatly reduces the matching accuracy requirements for the pipes and reduces the production costs relative to the rigid structural support 1.

It should be understood by those skilled in the art that the variations described in the first embodiment and the second embodiment are also applicable to the third embodiment, and are within the scope of the present invention, and are not described herein.

To sum up, the utility model discloses a two elastic sealing face of seal bush all adopt oval structural design, compare with the sealed uplift structure of current ball shape design, can allow seal bush both sides to treat the longitudinal axis of connecting tube and have more deviation, make seal bush have higher seal stability, and reduced treat the connecting tube to joining in marriage the required precision, manufacturing cost is reduced. Preferably, the sealing bush of the present invention further comprises a skirt for blocking water and dust from entering between the contact surfaces of the adjacent two elastic sealing surfaces and the pipe, thereby preventing the pipe from being corroded to prolong the sealing time. Still preferably, the utility model discloses a sealed bushing's supporter is spring or bellows, utilizes spring or bellows structure's elasticity can carry out strong drawing of patterns die sinking preparation method, has promoted production efficiency, still can reduce required impressing force when the installation, has promoted the installation effectiveness, and the amount of deflection of spring and bellows structure can also allow two to treat the longitudinal axis of connecting tube and have bigger dislocation deviation, has further improved sealing stability and has cut down pipe fitting manufacturing cost.

The above description is only for the description of some embodiments of the present invention, and not for any limitation of the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure all belong to the protection scope of the present invention.

Claims (10)

1. A seal bushing for sealingly connecting two pipes to be interconnected, comprising: a cylindrical support body and an elastic sealing member attached to an outer annular surface or an inner annular surface of the support body;

the elastic sealing component comprises two elastic sealing surfaces and a middle waist; the two elastic sealing surfaces are respectively arranged at two ends of the supporting body; the middle waist is positioned between the two elastic sealing surfaces and is inwards sunken relative to the two elastic sealing surfaces;

the two elastic sealing surfaces are rotationally symmetrical about the longitudinal axis of the support body; in any longitudinal section, the two elastic sealing surfaces are both in the shape of an ellipse, the long axis of the ellipse is perpendicular to the longitudinal axis of the support body, and the short axis of the ellipse is coincident with the longitudinal axis of the support body.

2. The seal bushing of claim 1, wherein the focal length of the ellipse is 40% to 65% of the major axis.

3. A seal cartridge according to claim 1 or claim 2, wherein the maximum thickness of the resilient seal face is from 25% to 30% of the major axis of the ellipse.

4. A seal cartridge according to claim 1 or 2, wherein the waisted portion is formed integrally with both of the resilient seal faces and the transition region between the waisted portion and both of the resilient seal faces is provided with a transition radius.

5. The seal bushing according to claim 1 or 2, wherein the elastic sealing member further comprises a skirt, the skirt is disposed at the middle waist, a surface of the skirt facing away from the support body is an arc-shaped curved surface, and a projected diameter of the skirt in a transverse direction of the support body is larger than a projected diameter of the elastic sealing surface.

6. The seal bushing of claim 5, wherein said resilient seal member includes two half-ear skirts, said skirts being spaced apart from one another; alternatively, the resilient sealing member comprises a full ear skirt.

7. A seal cartridge according to claim 1 or claim 2, wherein the resilient seal face has apertures therein.

8. The gasket of claim 7 wherein said aperture is tubular and has an opening through said resilient sealing surface, said opening being located on a side of said resilient sealing surface adjacent said medial waist, said aperture extending from said opening toward an interior center of said resilient sealing surface.

9. The seal cartridge of claim 8, wherein said resilient seal surface has a plurality of apertures therein, said plurality of apertures being evenly distributed along a circumference of said resilient seal surface.

10. A sealing bush according to claim 1 or 2, characterised in that the support body is a spring or a bellows.

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