CN217401688U - Seal and connection assembly - Google Patents

Abstract

The utility model discloses a sealing member and coupling assembling, the sealing member includes: the sealing structure comprises a sealing body, wherein a plurality of first sealing convex strands are arranged on one side of the sealing body, and a plurality of second sealing convex strands are arranged on the other side of the sealing body; wherein the seal body has a crush can located between the first seal bead and the second seal bead. The utility model discloses a sealing member can realize the installation cooperation with the many contact surfaces of connecting piece, does benefit to the installation stability of increase sealing member and connecting piece, and the connection leakproofness between two connecting pieces that improve effectively, and through setting up the groove that contracts of ulcerate, can make the first sealed protruding thigh after the deformation of collapsing in the groove of collapsing of orientation, the sealed protruding thigh of second have great sealed pretightning force with the connecting piece to improve the elastic seal effect.

Description

Seal and connection assembly

Technical Field

The utility model belongs to the technical field of seal structure manufacturing technology and specifically relates to a sealing member and coupling assembling that has this sealing member are related to.

Background

Rubber sealing rings are common in the automobile industry, and the sealing rings in the existing industry are generally O-shaped sealing rings. With the maturity of the industry, more enterprises find that the existing O-shaped sealing ring is mostly in single-side sealing when being in sealing fit with a connecting piece, so that the sealing effect of the sealing ring is poor, the installation stability is general, and an improved space exists.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a sealing member, which can realize the sealing cooperation of multi-surface contact, and is beneficial to improving the sealing performance, and has better installation stability.

According to the utility model discloses sealing member, include: the sealing structure comprises a sealing body, wherein a plurality of first sealing convex strands are arranged on one side of the sealing body, and a plurality of second sealing convex strands are arranged on the other side of the sealing body; wherein the seal body has a crush can located between the first seal bead and the second seal bead.

According to the utility model discloses the sealing member, through setting up first sealed protruding thigh at the sealing member, the sealed protruding thigh of second and the groove that contracts bursts, make this sealing member when being connected the cooperation with the connecting piece, can realize the installation cooperation with the connecting piece multiple contact surface, do benefit to the installation stability of increase sealing member and connecting piece, and the connection leakproofness between two connecting pieces that improve effectively, improve sealed effect, and through setting up the groove that contracts bursts, can make the first sealed protruding thigh after the deformation of collapsing in the groove that contracts burst towards, the sealed protruding thigh of second has great sealed pretightning force with the connecting piece, thereby improve the sealed effect of elasticity.

According to the utility model discloses the sealing member of some embodiments, the sealing body structure is the annular, first sealed protruding thigh is the annular and locates on the up end of sealing body, the sealed protruding thigh of second is the annular and locates on the lower terminal surface of sealing body, the groove that contracts bursts extends and offers in along the annular direction the internal perisporium of sealing body.

According to the utility model discloses the sealing member of some embodiments, the periphery wall of sealed body still is equipped with the sealed protruding thigh of third.

A seal according to some embodiments of the present invention, the third sealing lobe includes a first sub-portion and a second sub-portion, the first sub-portion being spaced apart from the second sub-portion; the first sealing convex strand and the first sub-part are used for being in sealing fit with a first connecting piece, and the second sealing convex strand and the second sub-part are used for being in sealing fit with a second connecting piece.

According to some embodiments of the sealing element of the present invention, the sealing body is configured as a ring, and the collapse groove is located between the first sub-portion and the second sub-portion in a radial projection of the sealing body.

According to some embodiments of the seal of the present invention, the first sub-portion, the second sub-portion, the first sealing bead and the second sealing bead are each configured as a boss structure having a semi-circular cross-section; wherein the radius of the first sub-portion is the same as the radius of the second sub-portion, and the radius of the first sealing bead is the same as the radius of the second sealing bead.

According to some embodiments of the sealing element of the present invention, the radius of the first sub-portion is smaller than the radius of the first sealing convex strand.

According to the utility model discloses the sealing member of some embodiments, the opening width of the groove that bursts is the same with the radius of first sealed protruding thigh.

According to the utility model discloses the sealing member of some embodiments, the axis of the protruding thigh of first sealed the axis of the protruding thigh of second sealed all is located on the toroidal surface at tank bottom place of the groove of collapsing.

The utility model also provides a coupling assembling.

According to the utility model discloses coupling assembling, including first connecting piece, second connecting piece and any kind of above-mentioned embodiment the sealing member, the sealing member install in first connecting piece with between the second connecting piece.

The advantages of the connection assembly and the above-described seal are the same with respect to the prior art and are not described in detail here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a connection assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a seal of a connection assembly according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a connection assembly according to an embodiment of the present invention;

fig. 4 is an enlarged view at a in fig. 3.

Reference numerals:

the connection assembly 100 is provided with a connection member,

a first connecting piece 1, a second connecting piece 2,

the sealing element 3, the sealing body 31, the first sealing convex strand 32, the second sealing convex strand 33, the first sub-portion 34, the second sub-portion 35 and the collapsing groove 36.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The sealing element 3 according to the embodiment of the present invention is described below with reference to fig. 1 to 4, when the sealing element 3 is connected to and engaged with the connecting element, the installation engagement with multiple contact surfaces of the connecting element can be realized, which is beneficial to increase the installation stability of the sealing element 3 and the connecting element, and the connection sealing performance between two connecting elements is effectively improved, so as to improve the sealing effect, and by providing the collapsing groove 36, the first sealing convex strand 32 and the second sealing convex strand 33 after collapsing and deforming in the collapsing groove 36 can be enabled to have a larger sealing pretightening force with the connecting element, thereby improving the elastic sealing effect.

As shown in fig. 1 to 4, the sealing member 3 according to the embodiment of the present invention includes a sealing body 31. The sealing body 31 is adapted to sealingly engage the connector.

The two connecting pieces can be provided, and include a first connecting piece 1 and a second connecting piece 2, the sealing body 31 is suitable for being clamped between the first connecting piece 1 and the second connecting piece 2, that is, the sealing piece 3 can play a role in connection and sealing between the first connecting piece 1 and the second connecting piece 2, so as to ensure that the first connecting piece 1 and the second connecting piece 2 have good sealing performance after being connected and fixed, and avoid the situation of water leakage or air leakage between the first connecting piece 1 and the second connecting piece 2.

First connecting piece 1 and second connecting piece 2 can be two arbitrary needs sealed complex structures, and if first connecting piece 1 is the water pipe, second connecting piece 2 is the coupling, when the end connection with coupling and water pipe, can set up sealing member 3 between the two to make sealing member 3 can play fine sealed effect to the junction of water pipe and coupling, improve sealed effect, reduce the volume of leaking water.

One side of sealing body 31 is equipped with a plurality of first sealed protruding thigh 32, the opposite side of sealing body 31 is equipped with a plurality of sealed protruding thigh 33 of second, wherein, first sealed protruding thigh 32 and the sealed protruding thigh 33 of second are respectively in the protruding setting of different positions department of sealing body 31, if first sealed protruding thigh 32 is in the protruding setting of the position department of the sealed body 31 that is close to first connecting piece 1, so that first sealed protruding thigh 32 and first connecting piece 1 seal up the cooperation, second sealing member 3 is in the protruding setting of the position department of the sealed body 31 that is close to second connecting piece 2, so that sealed protruding thigh 33 of second and second connecting piece 2 seal up the cooperation. After the first connecting piece 1 and the second connecting piece 2 are connected and fixed, a sealing groove is defined between the side faces of the first connecting piece and the second connecting piece facing each other, and the sealing element 3 is installed in the sealing groove.

Meanwhile, the first sealing convex strand 32 and the second sealing convex strand 33 are arranged to play a limiting role at the connecting position of the sealing body 31 and the two connecting pieces, so that the sealing body 31 is prevented from being automatically separated from the first connecting piece 1 and the second connecting piece 2, and the position stability of the sealing body 31 is ensured.

And in a concrete practice, the sealing body 31 may be provided with the collapse groove 36, and the collapse groove 36 is located between the first sealing convex strand 32 and the second sealing convex strand 33, so that the portion of the sealing body 31 provided with the first sealing convex strand 32 can collapse and deform towards the collapse groove 36, and the portion of the sealing body 31 provided with the second sealing convex strand 33 can also collapse and deform towards the collapse groove 36, so that when the sealing body 31 is installed between the first connector 1 and the second connector 2, the sealing body 31 can deform a certain amount towards the collapse groove 36. Therefore, after the sealing element 3 is installed on the first connecting piece 1 and the second connecting piece 2, the inner side crumple groove 36 of the sealing element 3 is elastically deformed, so that the direction of force is changed, part of the upper pressing force and the lower pressing force is converted into outward pretightening force, the sealing element 3 is enabled to press the first connecting piece 1 and the second connecting piece 2 outwards, and the sealing effect is improved.

According to the utility model discloses sealing member 3, through set up first sealed protruding thigh 32 at sealing member 3, the sealed protruding thigh 33 of second and ulcerate groove 36 that contracts, make this sealing member 3 when being connected the cooperation with the connecting piece, can realize the installation cooperation with the connecting piece many contact surfaces, do benefit to the installation stability of increase sealing member 3 and connecting piece, and the connection leakproofness between two connecting pieces that improve effectively, improve sealed effect, and through setting up groove 36 that contracts, can make the first sealed protruding thigh 32 after the deformation of collapsing in 36 towards the groove that contracts, the sealed protruding thigh 33 of second has great sealed pretightning force with the connecting piece, thereby improve the sealed effect of elasticity.

In some embodiments, the sealing body 31 is configured in an annular shape so that the first and second connectors 1 and 2 can each function as a seal at a plurality of positions in the circumferential direction of the joint.

The first sealing protrusion 32 is annular and disposed on one end surface of the sealing body 31, and the second sealing protrusion 33 is annular and disposed on the other end surface of the sealing body 31. Specifically, as shown in the left side of fig. 1, the seal body 31 has a rectangular cross section, the first seal projection is located on the upper end face of the seal body 31, and the second seal projection 33 is located on the lower end face of the seal body 31.

Thus, after actual installation, the upper surface of the sealing body 31 is tightly attached to the first connecting piece 1, and the first sealing convex part can also be tightly attached to the groove structure of the first connecting piece 1, so that the sealing body 31 is in sealing fit with multiple contact surfaces of the first connecting piece 1; the lower surface of the sealing body 31 is tightly attached to the second connecting piece 2, and the second sealing convex part can also be tightly attached to the groove structure of the second connecting piece 2, so that the sealing body 31 is in sealing fit with the second connecting piece 2 through multiple contact surfaces, and the sealing performance of the sealing body 31 can be improved.

The collapse groove 36 extends along the annular direction and is opened in the inner peripheral wall of the sealing body 31, so that when the sealing body 31 is installed between the first connecting piece 1 and the second connecting piece 2, the sealing body 31 can collapse towards the inner side and deform, the first sealing convex part and the second sealing convex part can be quickly installed and fixed with the two connecting pieces, and the first connecting piece 1 and the second connecting piece 2 are elastically acted outwards by the elastic force generated by deformation of the sealing body 31 towards the collapse groove 36.

In some embodiments, the peripheral wall of the sealing body 31 is further provided with a third sealing protrusion formed to protrude from the peripheral wall of the sealing body 31, wherein the third sealing protrusion is configured to be in sealing engagement with the first connector 1 and/or the second connector 2. That is to say, the third sealed convex strand can be with first connecting piece 1 sealed cooperation, also can be with second connecting piece 2 sealed cooperation, or simultaneously with first connecting piece 1 and second connecting piece 2 sealed cooperation to do benefit to the increase sealed effect.

It can be understood that, when the first connecting piece 1 and the second connecting piece 2 are connected and matched, the sealing matching can be realized at the first sealing convex part and the second sealing convex part through the sealing piece 3, and the multiple sealing can be realized at the third sealing convex part, so that the effect of the sealing piece 3 is greatly improved.

In some embodiments, as shown in fig. 2 and 4, the third sealing protrusion includes a first sub-portion 34 and a second sub-portion 35, the first sub-portion 34 is spaced apart from the second sub-portion 35, as shown in the left side region of fig. 1, the first sub-portion 34 and the second sub-portion 35 are spaced apart in the thickness direction of the sealing body 31, that is, the first sub-portion 34 is located in the upper region of the peripheral wall of the sealing body 31, the second sub-portion 35 is located in the lower region of the peripheral wall of the sealing body 31, so as to facilitate the sealing engagement of the first sub-portion 34 with the first connector 1, and the second sub-portion 35 is in the sealing engagement with the second connector 2.

Like this, when carrying out sealing connection through sealing member 3, radial and axial sealed through first sealed convex part and first sub-portion 34 realization respectively with first connecting piece 1 to sealing body 31 realizes double seal, and simultaneously, radial and axial sealed through second sealed convex part and second sub-portion 35 realization respectively with second connecting piece 2 to sealing body 31 also realizes double seal, from this, has greatly improved sealing effect of sealing body 31.

In some embodiments, the sealing body 31 is configured as a circular ring, and the crush can 36 is located between the first sub-portion 34 and the second sub-portion 35 in a radial projection of the sealing body 31. That is, in the thickness direction of the sealing body 31, the first sub-portion 34 is located near the upper region of the sealing body 31, the second sub-portion 35 is located near the lower region of the sealing body 31, and the crush slot 36 is located at the middle region of the sealing body 31.

In this way, when the specific installation is performed, the first sub-portion 34 and the second sub-portion 35 are respectively installed in alignment with the first connector 1 and the second connector 2, so that the upper side portion or the lower side portion of the inner side of the sealing body 31 can be driven to deform toward the inside of the crush slot 36 to install the sealing body 31 in the sealing groove between the first connector 1 and the second connector 2, thereby facilitating the elastic force generated by the deformation of the sealing body 31 toward the inside of the crush slot 36 to elastically force the first connector 1 and the second connector 2 outward.

In some embodiments, as shown in fig. 2 and 4, each of the first sub-portion 34, the second sub-portion 35, the first sealing protrusion 32 and the second sealing protrusion 33 is configured as a boss structure having a semicircular cross section, so that a larger contact area between the first connecting member 1 and the sealing body 31 can be obtained by providing the first sub-portion 34 and the first sealing protrusion 32, and a larger contact area between the second connecting member 2 and the sealing body 31 can be obtained by providing the second sub-portion 35 and the second sealing protrusion 33.

Wherein the radius of the first sub-portion 34 is the same as the radius of the second sub-portion 35, and the radius of the first sealing protrusion 32 is the same as the radius of the second sealing protrusion 33. Therefore, the contact area between the sealing body 31 and the first connecting piece 1 and the contact area between the sealing body 31 and the second connecting piece 2 are balanced, and the sealing body 31 and the two connecting pieces have the same sealing effect.

In some embodiments, as shown in fig. 2 and 4, the radius of the first sub-portion 34 is smaller than the radius of the first sealing bead 32, i.e., the radius of the second sub-portion 35 is smaller than the radius of the second sealing bead 33. In this way, the first sealing convex leg 32 serves as a main sealing matching part between the sealing body 31 and the first connecting element 1, the first sub-portion 34 serves as an auxiliary sealing matching part between the sealing body 31 and the first connecting element 1, similarly, the second sealing convex leg 33 serves as a main sealing matching part between the sealing body 31 and the second connecting element 2, and the second sub-portion 35 serves as an auxiliary sealing matching part between the sealing body 31 and the second connecting element 2, which is beneficial to realizing the sealing function between the sealing body 31 and the two connecting elements in multiple layers.

In some embodiments, as shown in fig. 2 and 4, the opening width of the crush can 36 is the same as the radius of the first sealing bead 32, i.e., the opening width of the crush can 36 is also the same as the radius of the second sealing bead 33. Thus, when the sealing body 31 is deformed toward the collapse groove 36, the deformation of the sealing body 31 can be close to the size of the first sealing convex strand 32 and the second sealing convex strand 33, so that the first sealing convex strand 32, the second sealing convex strand 33 and the connecting piece after the sealing body 31 is deformed toward the collapse groove 36 have large sealing pre-tightening force after being deformed, and the elastic sealing effect is improved.

In some embodiments, the first sealing bead 32 and the second sealing bead 33 are each configured as an annular shape extending in the circumferential direction of the seal body 31. Like this, when sealing body 31 and first connecting piece 1 carry out the sealed cooperation, first sealed convex strand 32 can all can play sealed effect with first connecting piece 1 in each position department on circumference, guarantee that there is not great clearance confession fluid flow between first connecting piece 1 and the sealing body 31, similarly, when sealing body 31 and second connecting piece 2 carry out the sealed cooperation, second sealed convex strand 33 can all can play sealed effect with second connecting piece 2 in each position department on circumference, guarantee that there is not great clearance confession fluid flow between second connecting piece 2 and the sealing body 31, improve the sealed effect of sealing body 31.

In some embodiments, the central axis of the first sealing convex strand 32 and the central axis of the second sealing convex strand 33 are located on the annular surface where the groove bottom of the crumpling groove 36 is located, as shown in fig. 4, the central axes of the first sealing convex strand 32, the groove bottom of the crumpling groove 36 and the central axis of the second sealing convex strand 33 are distributed over and over along the up-down direction, wherein the distance between the first sealing convex strand 32 and the crumpling groove 36 along the up-down direction may be set to be the same as the distance between the second sealing convex strand 33 and the crumpling groove 36 along the up-down direction, so that the portion of the sealing body 31 where the first sealing convex strand 32 is located and the portion of the sealing body 31 where the second sealing convex strand 33 is located can generate a relatively uniform deformation amount towards the crumpling groove 36. Therefore, after the sealing element 3 is installed on the first connecting piece 1 and the second connecting piece 2, the first sealing convex strand 32 and the second sealing convex strand 33 are in a state of being elastically deformed towards the inside of the collapse groove 36, the inner side collapse groove 36 of the sealing body 31 is elastically deformed, the direction of force is changed, part of the up-and-down pressing force is converted into outward pre-tightening force, the sealing body 31 is enabled to press the first connecting piece 1 and the second connecting piece 2 outwards, the sealing effect is improved, and when the first sub-portion 34 and the second sub-portion 35 are arranged, the sealing body 31 can press the first sub-portion 34 and the second sub-portion 35, the first sub-portion 34 and the second sub-portion 35 are enabled to press the first connecting piece 1 and the second connecting piece 2, and the sealing effect is also improved.

Of course, in the actual design, the central axis of the first sealing convex strand 32 and the central axis of the second sealing convex strand 33 may be slightly deviated from the annular surface, or the minimum distance between the central axis of the first sealing convex strand 32 and the central axis of the second sealing convex strand 33 and the annular surface where the groove bottom of the crush groove 36 is located may be defined as a range value.

The utility model also provides a coupling assembling 100.

As shown in fig. 1 and 3, the connection assembly 100 according to the embodiment of the present invention includes: a first connecting part 1, a second connecting part 2 and a sealing element 3 according to any of the embodiments described above.

As shown in fig. 1, the first connecting member 1 is located above the second connecting member 2, wherein a sealing groove is defined between the first connecting member 1 and the second connecting member 2, the sealing groove is open at the inner sides of the two connecting members, and the sealing member 3 can be installed into the sealing groove from the inside of the two connecting members.

As shown in fig. 1, in the specific design, the sealing element 3 is first installed between the first connecting element 1 and the second connecting element 2, and the sealing body 31 is gradually compressed along with the connection and fastening of the first connecting element 1 and the second connecting element 2, so that the portion of the sealing body 31 provided with the first sealing protrusion 32 can be deformed toward the collapse groove 36, and the portion of the sealing body 31 provided with the second sealing protrusion 33 can also be deformed toward the collapse groove 36. In this way, after the first connector 1 and the second connector 2 are connected and fixed with the sealing element 3, the inner side crumple groove 36 of the sealing element 3 is elastically deformed, so that the direction of force is changed, part of the upper pressing force and the lower pressing force is converted into outward pretightening force, so that the sealing element 3 presses the first connector 1 and the second connector 2 outwards, and the sealing effect is improved.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A seal, comprising:

the sealing structure comprises a sealing body (31), wherein a plurality of first sealing convex strands (32) are arranged on one side of the sealing body (31), and a plurality of second sealing convex strands (33) are arranged on the other side of the sealing body (31); wherein

The sealing body (31) has a crush slot (36), the crush slot (36) being located between the first sealing bead (32) and the second sealing bead (33).

2. The seal according to claim 1, characterized in that the seal body (31) is configured in an annular shape, the first sealing bead (32) is annular and provided on an upper end face of the seal body (31), the second sealing bead (33) is annular and provided on a lower end face of the seal body (31), and the crush slot (36) extends in an annular direction and opens on an inner peripheral wall of the seal body (31).

3. A seal according to claim 2, characterized in that the peripheral wall of the sealing body (31) is further provided with a third sealing bead.

4. A sealing element according to claim 3, wherein the third sealing strand comprises a first sub-portion (34) and a second sub-portion (35), the first sub-portion (34) being spaced apart from the second sub-portion (35); wherein

The first sealing convex strand (32) and the first sub-portion (34) are used for being in sealing fit with a first connecting piece (1), and the second sealing convex strand (33) and the second sub-portion (35) are used for being in sealing fit with a second connecting piece (2).

5. Seal according to claim 4, characterized in that the sealing body (31) is configured as a circular ring, and in a radial projection of the sealing body (31) the crush slot (36) is located between the first subsection (34) and the second subsection (35).

6. A sealing element according to claim 4, characterized in that the first subsection (34), the second subsection (35), the first sealing bead (32) and the second sealing bead (33) are each configured as a boss structure with a semicircular cross section; wherein

The radius of the first sub-portion (34) is the same as the radius of the second sub-portion (35), and the radius of the first sealing protrusion (32) is the same as the radius of the second sealing protrusion (33).

7. The seal of claim 6, wherein the radius of the first sub-portion (34) is less than the radius of the first sealing bead (32).

8. The seal of claim 6, wherein the opening width of the crush slot (36) is the same as the radius of the first seal bead (32).

9. The seal according to claim 2, characterized in that the central axis of the first sealing bead (32) and the central axis of the second sealing bead (33) are located on the annular surface of the groove base of the crush groove (36).

10. A connecting assembly, characterized by a first connecting piece (1), a second connecting piece (2) and a sealing element according to any one of claims 1-9, the sealing element (3) being mounted between the first connecting piece (1) and the second connecting piece (2).

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