CN215060305U

CN215060305U - Braided tube sealing joint

Info

Publication number: CN215060305U
Application number: CN202120838163.2U
Authority: CN
Inventors: 江长友
Original assignee: Yuhuan Jianglin Plumbing Co ltd
Current assignee: Yuhuan Jianglin Plumbing Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-12-07
Anticipated expiration: 2031-04-22

Abstract

The utility model provides a woven pipe sealing joint belongs to pipe fitting technical field. It has been solved the leakproofness between current joint and the inner tube and has been heated the in-process that expands gradually because sealed face area constantly diminishes and the scheduling problem worsens. This sealed joint of braided tube, which comprises a body, the body includes the linkage segment, be provided with sawtooth bulge loop one on the lateral surface of linkage segment, ring bulge loop one, sawtooth bulge loop two and ring bulge loop two, the mounting groove has been seted up on the lateral surface of ring bulge loop two, the embedded sealing washer that is equipped with of mounting groove, the medial surface of sealing washer is the face of cylinder and pastes and lean on the bottom surface at the mounting groove, the preceding terminal surface of sealing washer is the plane and pastes and lean on the preceding wall at the mounting groove, the rear end face of sealing washer is the plane and pastes and lean on the back wall at the mounting groove, the conical surface before having on the sealing washer lateral surface, middle cylinder and back conical surface. In the process that the inner tube is heated and expands gradually, the sealing performance between the joint and the inner tube cannot be worsened because the area of the sealing surface is continuously reduced.

Description

Braided tube sealing joint

Technical Field

The utility model belongs to the technical field of the pipe fitting, a woven tube sealing joint is related to.

Background

Braided tubes are commonly used in plumbing systems. The braided tube is a flexible tube, and a stainless steel braided layer or a nylon braided layer is arranged on the outer side of the inner tube and used for protecting the inner tube. The braided tube is assembled at the factory prior to entering the consumer market to form a braided tube assembly comprising a braided tube body and fittings secured to opposite ends of the braided tube body. The braided tube is called a braided tube assembly in daily life.

Chinese patent literature discloses a stainless steel braided tube [ application number: CN 201020284271.1; publication number: CN 201757232U ], which is composed of a gasket, an inner tube, a screw cap, a core, a braid and a steel sleeve. The inner hole at one end of the nut is provided with a retaining shoulder, the core comprises an end part and a connecting rod, the end part and the connecting rod are connected into a whole, a buckle is arranged between the end part and the connecting rod, and the outer surface of the connecting rod is provided with an inverted tooth-shaped structure. The nut is sleeved on the core, and the buckle and the shoulder are clamped. The end part of the core is provided with a gasket, a connecting rod of the core is tightly sleeved with the inner tube, the outer of the inner tube is coated with a braided layer, the outer of the braided layer at the joint of the core and the inner tube is tightly fixed with a steel sleeve, and the steel sleeve, the core and the inner tube are tightly connected by punching.

After the steel sleeve, the inner pipe and the core are connected through stamping, the steel sleeve and the inner pipe deform under the action of external force, a tooth-shaped structure matched with the tooth-shaped structure is formed at the inverted tooth-shaped structure of the core connecting rod on the inner side surface of the inner pipe, and the inner side surface of the inner pipe and the outer side surface of the connecting rod are sealed in a matched mode through the tooth-shaped structure and the inverted tooth-shaped structure. Because the inner tube adopts flexible macromolecular material, and the core adopts the copper product material, and both thermal expansion coefficients are different, when carrying the medium after the heating in the braided tube assembly, for example supply hot water, because thermal expansion coefficient's difference, appear the slit easily between the lateral surface of core and the medial surface of inner tube after being heated to lead to the joint department at braided tube assembly both ends to take place to leak.

Therefore, an engineer improves the original joint structure, and installs an O-shaped sealing ring on the joint, such as the patent document with the publication number of CN 211449971U, and discloses a sealing joint for a braided pipe, which comprises a cylindrical body, the body comprises a buckling part for connecting with a nut and a connecting section for connecting with an inner pipe, the rear end of the connecting section is integrally connected with the buckling part, a first sawtooth convex ring, a second sawtooth convex ring and a third sawtooth convex ring are sequentially arranged on the outer side surface of the connecting section along the direction from the front end to the rear end, a first convex circular ring is arranged on the outer side surface of the connecting section behind the first sawtooth convex ring, the conical surface of the first sawtooth convex ring is connected with the outer side surface of the first circular ring, a second convex circular ring is arranged on the outer side surface of the connecting section behind the second sawtooth convex ring, and the outer side convex part of the first circular ring is arranged on the outer side surfaces of the second sawtooth convex ring and the circular convex ring, the outer side face of the second circular convex ring is provided with an annular mounting groove, an elastic O-shaped sealing ring is fixedly arranged in the mounting groove, and the outer side portion of the O-shaped sealing ring extends out of the mounting groove and protrudes out of the outer side face of the first circular convex ring.

When the joint and the inner pipe are assembled, the connecting section of the joint is inserted into the inner pipe and fixed through stamping, and the inner side surface of the inner pipe is pressed against the outer side part of the O-shaped sealing ring during stamping to deform the O-shaped sealing ring. The outer side part of the O-shaped sealing ring is in an arc-shaped protrusion, and after the punching is finished, the outer side part of the O-shaped sealing ring can be in a flattened structure. When the inner tube is heated and swells, along with the gradual swelling of inner tube, the sealing portion takes place to reset and warp and gradually approaches to circular-arc, can lead to the contact seal face area between O type sealing washer and the inner tube to diminish gradually like this, leads to the leakproofness to worsen gradually.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a weave a tub sealing joint, solved the leakproofness between current joint and the inner tube and received the technical problem that the in-process that expands gradually at the inner tube is heated and is worsened because sealing surface area constantly diminishes.

The purpose of the utility model can be realized by the following technical proposal:

a sealing joint of a braided tube comprises a cylindrical body, wherein the body comprises a connecting section used for being connected with an inner tube, a first sawtooth convex ring, a first circular ring, a second sawtooth convex ring and a second circular ring are sequentially arranged on the outer side surface of the connecting section along the direction from the front end to the rear end, the first sawtooth convex ring is connected with the first circular ring, the outer side part of the first circular ring protrudes out of the outer side surfaces of the second sawtooth convex ring and the second circular ring, a mounting groove is formed in the outer side surface of the second circular ring, a sealing ring is embedded in the mounting groove, the sealing joint is characterized in that the inner side surface of the sealing ring is a cylindrical surface and is attached to the bottom surface of the mounting groove, the front end surface of the sealing ring is a plane and is attached to the front wall surface of the mounting groove, the rear end surface of the sealing ring is a plane and is attached to the rear wall surface of the mounting groove, and a front conical surface which inclines forwards is in a conical surface shape is arranged on the outer side surface of the front end of the sealing ring, the outer side surface of the rear end of the sealing ring is provided with a rear conical surface which inclines backwards and is in a conical surface shape, and a middle cylindrical surface which is in a cylindrical surface shape is arranged between the front conical surface and the rear conical surface on the outer side surface of the sealing ring.

When the joint and the inner pipe are assembled, the connecting section of the joint is inserted into the inner pipe and fixed by punching. The inner tube deforms and presses the sealing ring when being stamped, and the inner side surface of the inner tube can press the middle cylindrical surface in the stamping process due to the fact that the front conical surface, the middle cylindrical surface and the rear conical surface form a protruding structure on the outer side portion of the sealing ring. The outer side of the sealing ring is pressed and elastically deformed, elastic potential energy is stored in the sealing ring after punching is completed, elastic force is generated, the middle cylindrical surface is tightly abutted against the inner side surface of the inner tube to form sealing, and when the inner tube is heated and expanded, the sealing ring can release the elastic potential energy and enable the middle cylindrical surface to be always tightly attached to the inner tube to keep sealing. Because the middle cylindrical surface is cylindrical, the middle cylindrical surface is always kept attached to the inner tube to form sealing in the process that the inner tube is heated and gradually expands, and the area of the sealing surface of the sealing ring and the inner tube cannot be changed. Therefore, in the process that the inner pipe is heated and gradually expands, the sealing performance between the joint and the inner pipe cannot be worsened because the area of the sealing surface is continuously reduced.

And, the medial surface of sealing washer is the face of cylinder and pastes and lean on the bottom surface of mounting groove, the preceding terminal surface of sealing washer is the plane and pastes and lean on the preceding wall of mounting groove, the rear end face of sealing washer is the plane and pastes and lean on the back wall of mounting groove, make just stable fixed state keeps between the wall of the inside portion of sealing washer and mounting groove before the inner tube punching press like this, the inside portion of sealing washer keeps stable and makes middle cylinder can keep the cylinder state at the in-process of inner tube punching press, prevent that middle cylinder from taking place the slope and influencing the contact surface area of inner tube and sealing washer, guarantee the leakproofness between sealing washer and the inner tube.

In the above braided tube sealing joint, the front conical surface and the rear conical surface are symmetrically arranged. The deformation of the front conical surface and the rear conical surface of the sealing ring can be kept consistent, the middle cylindrical surface is guaranteed to be kept in a cylindrical surface state and is always attached to the inner side surface of the inner tube, the situation that the sealing surface area between the joint and the inner tube is reduced when the inner tube is heated and expands continuously is avoided, and the situation that the sealing performance between the joint and the inner tube is reduced due to the fact that the sealing surface area is reduced is avoided.

In the above braided tube sealing joint, the diameter of the intermediate cylindrical surface is greater than the outer diameter of the annular convex ring two, and the diameter of the intermediate cylindrical surface is less than or equal to the outer diameter of the annular convex ring one. The diameter of the middle cylindrical surface is larger than the outer diameter of the circular convex ring II, so that the inner pipe can be pressed against the middle cylindrical surface when the inner pipe is deformed by stamping, the outer side part of the sealing ring is elastically deformed and is pressed against the inner pipe to form sealing. Because the joint inserts the in-process inner tube and can pass through the sealing washer after being propped open by ring bulge loop one to the in-process inner tube, and the diameter of middle cylinder is less than or equal to the external diameter of ring bulge loop one, can prevent to be cut by the inner tube because the sealing washer protrusion is in the lateral surface of ring bulge loop one, guarantees the integrality of sealing washer, makes to have better leakproofness between middle cylinder and the inner tube.

In the braided tube sealing joint, the axial length of the sealing ring is greater than four times of the radial depth of the mounting groove, the axial length of the middle cylindrical surface is 1/10-3/20 of the axial length of the sealing ring, and the included angle between the front conical surface and the middle cylindrical surface is 155-165 degrees. Therefore, the middle cylindrical surface can have enough sealing surface area, and the inner pipe can deform and extrude into the mounting groove during stamping to enable the outer side part of the sealing ring to generate enough elastic potential energy, so that the sealing performance between the joint and the inner pipe is ensured.

In the braided tube sealing joint, the distance from the middle cylindrical surface to the outer side surface of the annular convex ring is 1/10-1/8 of the radial depth of the mounting groove. Therefore, the inner pipe can be further ensured to generate enough elastic potential energy when the inner pipe is deformed by stamping, the outer side part of the sealing ring can be ensured not to be excessively deformed and lose efficacy, and the sealing property between the joint and the inner pipe is ensured.

In the above braided tube sealing joint, the front end face of the sealing ring is parallel to the rear end face of the sealing ring, the front end face of the sealing ring is perpendicular to the inner side face of the sealing ring, and the middle cylindrical surface and the inner side face of the sealing ring are concentrically arranged. The structure of the sealing ring is kept stable and the sealing ring is convenient to install in the installation groove, and meanwhile, the cylindrical surface structure of the middle cylindrical surface is kept after the sealing ring is installed, so that the sealing performance between the sealing ring and the inner pipe is guaranteed.

Compared with the prior art, the utility model has the advantages of it is following:

the lateral surface of sealing washer includes preceding conical surface, middle cylinder and the back conical surface, and the inboard face of sealing washer pastes on the bottom surface of mounting groove simultaneously, and the preceding terminal surface of sealing washer pastes on the preceding wall of mounting groove, and the rear end face of sealing washer pastes on the back wall of mounting groove, makes the leakproofness of joint and inner tube can not lead to sealing surface area constantly diminishing and the variation because of the inner tube is heated and expands gradually. The front conical surface and the rear conical surface are symmetrically arranged, and the sealing ring structure is matched with the mounting groove structure, so that the sealing property between the joint and the inner pipe is ensured.

Drawings

FIG. 1 is a cross-sectional view of the present braided tube sealing joint;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of the present braided tube sealing joint inserted into an inner tube;

fig. 4 is a schematic view of the structure of the braided tube sealing joint after punching.

In the figure, 1, a body; 2. a plug-in connector; 3. a fastening part; 4. a connecting section; 4a, a sawtooth convex ring I; 4b, a circular convex ring I; 4c, a sawtooth convex ring II; 4d, a circular convex ring II; 4e, mounting grooves; 5. a seal ring; 5a, a front conical surface; 5b, a middle cylindrical surface; 5c, a rear conical surface; 6. an inner tube.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-4, a braided tube sealing joint includes a tubular body 1, the body 1 includes a plug 2, a fastening portion 3 for connecting with a nut, and a connecting section 4 for connecting with an inner tube 6. Plug 2 is located the rear of buckling part 3, and plug 2's front end links to each other with buckling part 3 is integrative, and linkage segment 4 is located the place ahead of buckling part 3, and linkage segment 4's rear end links to each other with buckling part 3 is integrative.

The outer side face of the connecting section 4 is sequentially provided with a sawtooth convex ring 4a, a circular ring convex ring 4b, a sawtooth convex ring two 4c and a circular ring convex ring two 4d along the direction from the front end to the rear end, the outer side faces of the sawtooth convex ring 4a and the sawtooth convex ring two 4c are conical surfaces, and the outer side faces of the circular ring convex ring 4b and the circular ring convex ring two 4d are cylindrical surfaces. The first sawtooth convex ring 4a is connected with the first circular convex ring 4b, and the first circular convex ring 4b and the second sawtooth convex ring 4c are arranged separately. The conical surface of the first sawtooth convex ring 4a is connected with the outer side surface of the first circular ring 4b, and the outer diameter of the first circular ring 4b is equal to the maximum outer diameter of the first sawtooth convex ring 4 a. The taper of the first sawtooth convex ring 4a is smaller than that of the second sawtooth convex ring 4 c. The outer side face of the second annular convex ring 4d is provided with an annular mounting groove 4e, the bottom face of the mounting groove 4e is a cylindrical face, the front wall face and the rear wall face of the mounting groove 4e are planes, the front wall face of the mounting groove 4e is parallel to the rear wall face of the mounting groove 4e, and the front wall face of the mounting groove 4e is perpendicular to the bottom face of the mounting groove 4 e. The second sawtooth convex ring 4c and the second circular convex ring 4d are separated by the installation groove 4e, and the outer diameter of the second circular convex ring 4d is equal to the maximum outer diameter of the second sawtooth convex ring 4 c. A first caulking groove is formed between the first circular ring convex ring 4b and the second sawtooth convex ring 4c on the outer side face of the connecting section 4, and a second caulking groove is formed between the second circular ring convex ring 4d and the buckling part 3 on the outer side face of the connecting section 4. The outer side part of the first circular ring convex ring 4b protrudes out of the outer side surfaces of the second sawtooth convex ring 4c and the second circular ring convex ring 4d, namely the outer diameter of the first circular ring convex ring 4b is larger than the maximum outer diameter of the second sawtooth convex ring 4c, and the outer diameter of the first circular ring convex ring 4b is larger than the outer diameter of the second circular ring convex ring 4 d.

The installation groove 4e is embedded with a sealing ring 5 with elasticity, and the sealing ring 5 is made of elastic material, such as silica gel or rubber material. The cross section of the inner side of the sealing ring 5 is rectangular, and the cross section of the outer side of the sealing ring 5 is trapezoidal. The medial surface of sealing washer 5 is the face of cylinder and pastes and lean on the bottom surface of mounting groove 4e, and the preceding terminal surface of sealing washer 5 is the plane and pastes and lean on the preceding wall of mounting groove 4e, and the rear end face of sealing washer 5 is the plane and pastes and lean on the rear wall of mounting groove 4e, and the preceding terminal surface of sealing washer 5 is parallel with the rear end face of sealing washer 5, and the preceding terminal surface of sealing washer 5 is perpendicular with the medial surface of sealing washer 5. The outer side surface of the front end of the seal ring 5 is provided with a front conical surface 5a which is inclined forward and is conical surface-shaped, the outer side surface of the rear end of the seal ring 5 is provided with a rear conical surface 5c which is inclined backward and is conical surface-shaped, and the outer side surface of the seal ring 5 is provided with a middle cylindrical surface 5b which is cylindrical surface-shaped and is positioned between the front conical surface 5a and the rear conical surface 5 c. The front conical surface 5a and the rear conical surface 5c are symmetrically arranged, and the middle cylindrical surface 5b is concentrically arranged with the inner side surface of the sealing ring 5. The front conical surface 5a, the middle cylindrical surface 5b and the rear conical surface 5c form a convex structure with an isosceles trapezoid cross section on the outer side of the sealing ring 5. The diameter of the middle cylindrical surface 5b is larger than the outer diameter of the annular convex ring II 4d, and the diameter of the middle cylindrical surface 5b is smaller than or equal to the outer diameter of the annular convex ring I4 b. The axial length of the sealing ring 5 is more than four times of the radial depth of the mounting groove 4e, the axial length of the middle cylindrical surface 5b is 1/10-3/20 of the axial length of the sealing ring 5, the included angle between the front conical surface 5a and the middle cylindrical surface 5b is 155-165 degrees, and the distance from the middle cylindrical surface 5b to the outer side surface of the second annular convex ring 4d is 1/10-1/8 of the radial depth of the mounting groove 4 e. Preferably, the diameter of the middle cylindrical surface 5b is equal to the outer diameter of the first annular protruding ring 4b, the distance from the middle cylindrical surface 5b to the outer side surface of the second annular protruding ring 4d is 1/9 of the radial depth of the installation groove 4e, the axial length of the sealing ring 5 is four times of the distance from the middle cylindrical surface 5b to the inner side surface of the sealing ring 5, the axial length of the middle cylindrical surface 5b is 1/8 of the axial length of the sealing ring 5, and the included angle between the front conical surface 5a and the middle cylindrical surface 5b is 159-161 degrees.

Specifically, as shown in fig. 1 and 2, the diameter of the first dotted-line cylindrical surface from outside to inside is equal to the outer diameter of the first annular convex ring 4b, and the diameter of the second dotted-line cylindrical surface from outside to inside is equal to the outer diameter of the second annular convex ring 4 d. For example, the radial depth of the mounting groove 4e is 3.6mm, the distance from the middle cylindrical surface 5b to the outer side surface of the second annular convex ring 4d is 0.36mm to 0.45mm, preferably, the distance from the middle cylindrical surface 5b to the outer side surface of the second annular convex ring 4d is 0.4mm, the distance from the middle cylindrical surface 5b to the inner side surface of the sealing ring 5 is 4.0mm, the axial length of the sealing ring 5 is 16.0mm, the axial length of the middle cylindrical surface 5b can be 1.6mm to 2.4mm, preferably 2.0mm, and the included angle between the front conical surface 5a and the middle cylindrical surface 5b is 159 degrees to 161 degrees.

When assembling the joint and the inner pipe 6, the connecting section 4 of the joint is inserted into the inner pipe 6 and fixed by punching. The inner tube 6 deforms and presses against the sealing ring 5 during stamping, and the front conical surface 5a, the middle cylindrical surface 5b and the rear conical surface 5c form a convex isosceles trapezoid structure on the outer side of the sealing ring 5, so that the inner side surface of the inner tube 6 can press against the middle cylindrical surface 5b during stamping. The outer side of the sealing ring 5 is pressed and elastically deformed, after punching, the sealing ring 5 stores elastic potential energy and generates elasticity, the middle cylindrical surface 5b tightly abuts against the inner side surface of the inner tube 6 to form sealing, and when the inner tube 6 is heated and expands, the sealing ring 5 can release the elastic potential energy and enable the middle cylindrical surface 5b to be tightly attached to the inner tube 6 all the time to keep sealing. Because the middle cylindrical surface 5b is cylindrical, the middle cylindrical surface 5b is always kept attached to the inner tube 6 to form sealing in the process that the inner tube 6 is heated and gradually expands, and the area of the sealing surface of the sealing ring 5 and the inner tube 6 cannot be changed. Therefore, in the process that the inner pipe 6 is heated and gradually expands, the sealing performance between the joint and the inner pipe 6 cannot be deteriorated due to the fact that the area of the sealing surface is continuously reduced.

Moreover, the inner side surface of the sealing ring 5 is a cylindrical surface and is attached to the bottom surface of the mounting groove 4e, the front end surface of the sealing ring 5 is a plane and is attached to the front wall surface of the mounting groove 4e, the rear end surface of the sealing ring 5 is a plane and is attached to the rear wall surface of the mounting groove 4e, so that the inner side portion of the sealing ring 5 and the wall surface of the mounting groove 4e are kept in a stable fixed state before the inner tube 6 is punched, the inner side portion of the sealing ring 5 is kept stable, the middle cylindrical surface 5b can keep a cylindrical surface state in the punching process of the inner tube 6, the middle cylindrical surface 5b is prevented from being inclined to influence the contact surface area of the inner tube 6 and the sealing ring 5, and the sealing performance between the sealing ring 5 and the inner tube 6 is ensured.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A sealing joint of a braided tube comprises a cylindrical body (1), wherein the body (1) comprises a connecting section (4) connected with an inner tube (6), a first sawtooth convex ring (4a), a first circular convex ring (4b), a second sawtooth convex ring (4c) and a second circular convex ring (4d) are sequentially arranged on the outer side surface of the connecting section (4) along the direction from the front end to the rear end, the first sawtooth convex ring (4a) is connected with the first circular convex ring (4b), the outer side part of the first circular convex ring (4b) protrudes out of the outer side surfaces of the second sawtooth convex ring (4c) and the second circular convex ring (4d), an installation groove (4e) is formed in the outer side surface of the second circular convex ring (4d), a sealing ring (5) is embedded in the installation groove (4e), and the inner side surface of the sealing ring (5) is a cylindrical surface and is attached to the bottom surface of the installation groove (4e), the utility model discloses a sealing washer, including sealing washer (5), preceding terminal surface of sealing washer (5) is the plane and pastes on the preceding wall of mounting groove (4e), the rear end face of sealing washer (5) is the plane and pastes on the back wall of mounting groove (4e), have forward slope on the lateral surface of sealing washer (5) front end and be the preceding conical surface (5a) of conical surface form, have backward slope on the lateral surface of sealing washer (5) rear end and be the back conical surface (5c) of conical surface form, it has middle cylinder (5b) that are the cylindrical surface form to lie in between preceding conical surface (5a) and back conical surface (5c) on the lateral surface of sealing washer (5).

2. The woven tube sealing joint as claimed in claim 1, wherein said front and rear tapered surfaces (5a, 5c) are symmetrically arranged.

3. The woven tube sealing joint as claimed in claim 2, wherein the diameter of said intermediate cylindrical surface (5b) is greater than the outer diameter of the second annular bead (4d), and the diameter of the intermediate cylindrical surface (5b) is less than or equal to the outer diameter of the first annular bead (4 b).

4. The braided tube sealing joint of claim 3, wherein the axial length of the sealing ring (5) is greater than four times the radial depth of the mounting groove (4e), the axial length of the intermediate cylindrical surface (5b) is 1/10-3/20 of the axial length of the sealing ring (5), and the angle between the front tapered surface (5a) and the intermediate cylindrical surface (5b) is 155 ° -165 °.

5. The braided tube sealing joint of claim 3 or 4, wherein the distance from the intermediate cylindrical surface (5b) to the outer side of the second annular protruding ring (4d) is 1/10-1/8 of the radial depth of the mounting groove (4 e).

6. The woven tube sealing joint according to any one of claims 1 to 4, wherein the front end face of the sealing ring (5) is parallel to the rear end face of the sealing ring (5), the front end face of the sealing ring (5) is perpendicular to the inner side face of the sealing ring (5), and the intermediate cylindrical surface (5b) is concentrically arranged with the inner side face of the sealing ring (5).