JPH1061860A - Joint for fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a different fluid from being mixed in fluid in a joint during connection. SOLUTION: A joint 20 for fluid is formed such that a joint for fluid comprises a female joint 21 and a male joint 22, which are movable to a connection state wherein internal fluid passages 42 and 54 are pressed with each other on one and the same axis and intercommunicated and a separation state wherein the passages are separated away from each other for disconnection, and the female joint is provided with a female body 24 having a connection port 23, a valve seat part 28 having a valve hole 26 on the female side and pressed against the connection port side, and a valve 29 on the female side, a male joint is provided with a male body 31 having a valve hole 30 on the male side having diameter larger than that of a valve 33 on the male side, and an annular seal member 34 to seal a gap therebetween is arranged at one of the tip surface of the valve seat part and the tip surface of the male body. The whole of the end face, positioned facing the valve on the female side, of the valve on the male side forms a seal surface and the annular seal member is formed such that in a state that a seal surface is adhered to the whole area of the inside of the annular seal member being an opposite surface. An expansion part 37 deformable according to contact of the valve on the female side is formed at the central part of the seal surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid joint capable of connecting and disconnecting a fluid passage to and from a fluid passage and preventing mixing of different fluids.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
There is one described in JP-A-54090. The schematic configuration thereof is such that each fluid passage is connected to a separate fluid passage, and the fluid passages are pressed together on the same axis and communicate with each other, and the internal fluid passages are separated from each other and cut off and cut off. The female joint 1 and the male joint 2 are provided so as to be movable to a separated state. As shown in FIG. 10 in which the main part is enlarged to show a state in the middle of connection, the female joint 1 has a cylindrical female body 4 having a connection port 3 on the distal end surface, and a female female body 4 having a cylindrical shape.
A valve seat portion 8 slidably provided along the axis line, a distal end portion of the inner hole 5 being a female valve hole 6, which is pressed toward the connection port 3 by a female spring 7, A female valve 9 is provided so as to close the female valve hole 6 of the seat portion 8 from the outside thereof and is fixed to the female main body 4. And male joint 2
Is a male body 1 having a distal end portion having an outer diameter fitted into the connection port 3 and having a male valve hole 10 having a larger diameter than the female valve 9 on the distal end surface.
1 and a male valve 13 provided so as to close the male valve hole 10 of the male main body 11 by pressing the male valve hole 10 from the inside thereof with a male spring 12.
And An annular sealing member that seals between one of the distal end surface of the valve seat portion 8 and the distal end surface of the male body 11 opposed thereto, in the illustrated case, the distal end surface of the valve seat portion 8, A seal ring A is provided. Also,
A seal ring B for sealing between the female valve 9 and the female valve hole 10, a seal ring C for sealing between the female valve 9 and the male valve 13, a male valve hole 10 and the male valve 13; A seal ring D and the like are provided to seal the space therebetween.

In the fluid joint, when the female joint 1 and the male joint 2 are separated and separated from each other, the female valve 9 closes the female valve hole 6 in the female joint 1 and the male valve 2 in the male joint 2. The male side valve 13 closes the male side valve hole 10 and does not leak to the outside even if fluid exists in each joint. When both or one of the female joint 1 and the male joint 2 is moved toward each other so as to approach each other on the same axis while facing the distal end side, first, the female joint 1 is moved through the seal ring A which is an annular seal member. The distal end surface of the valve seat portion 8 and the distal end surface of the male body 11 abut against each other to partition the inside of the annular seal member A from the outside world (the state shown in FIG. 10), followed by the female valve 9 and the male valve 1
3 abuts on their respective end surfaces, and further moves the male body 1
1 retracts the valve seat portion 8 and the female valve 9 substantially retracts the male valve 13, that is, the female valve 9 presses the male valve 13 in place with respect to the advance of the male body 11. Thus, the female valve hole 6 and the male valve hole 10 are opened. The fluid is circulated in this state. And after the distribution work, both joints 1,
When one or both of the two are moved along the axis and pulled apart, the connections are disconnected in the reverse order of connection. Although not shown, the joints 1 and 2 are provided with connecting portions for connecting the internal fluid passages to the external fluid passages or tanks in the female main body 4 and the male main body 11, respectively.

[0004]

In the above-mentioned conventional fluid coupling, seal rings A, B, C, D, etc., which seal between members, are used to shut off fluid communication. When connecting such a fluid coupling, first, the valve seat 8 and the male body 1 are connected.
1 is sealed by a seal ring A, and thereafter, the male valve 13 and the female valve 9 come into contact with each other. At this time, since the seal ring A is provided so as to slightly protrude from its mounting surface in order to obtain a sealing force, the valve seat portion 8 and the female valve 9 are provided inside the seal ring A as shown in FIG. A cavity 14 is formed by the distal end surface and the distal end surfaces of the male body 11 and the male side valve 13. In such a cavity 14, a fluid such as air in an atmosphere in which the fluid joint is used, that is, a different fluid is present. If the connection of the fluid joint is performed in such a state, that is, if the female joint 1 and the male joint 2 are further moved in a direction approaching each other, for example, if the male joint 2 is advanced, the male body 11 Pushing the seat 8, the male valve 13 is stopped from moving forward by the female valve 9, the valve seat 8 is retracted while compressing the female spring 7, and the female valve hole 6 is opened.
At the same time, the male body 11 advances while compressing the male side spring 12 to open the male side valve hole 10, and by opening both valve holes, the connection state in which the inside of the valve seat portion 8 and the inside of the male body 11 communicate with each other. Becomes At this time, a different fluid such as air existing in the space 14 is mixed into the internal fluid.

[0005] Also in the seal rings B and D other than the seal ring A, gaps (contact surfaces) 15 and 16 exist except for the portions where the seal rings are in close contact. That is, the contact surface 15 of the female valve 9 and the female valve hole 6 outside the seal ring B, and the contact surface 16 of the male valve 13 and the male valve hole 10 outside the seal ring D. The seal ring C divides the space 14 and isolates the inner part thereof to suppress the mixing of the different fluid, but the outer part has a gap 17. Such gaps (contact surfaces) 15, 16, 17
Since the above-mentioned different fluid exists, the different fluid may be mixed into the internal fluid.

When such a fluid coupling is used, there is a problem that the internal fluid may be deteriorated due to mixing of a different fluid depending on the characteristics of the internal fluid. It is also known that, in a microgravity environment such as on a spacecraft, the incorporation of bubbles at the time of connecting a fluid joint adversely affects the performance of equipment such as a pump existing in the same piping system. SUMMARY OF THE INVENTION It is an object of the present invention to prevent a different fluid from being mixed into a fluid inside a joint when a fluid joint is connected.

[0007]

According to the present invention, there is provided a connection state in which each of the internal fluid passages is connected to a separate fluid passage and pressed against each other on the same axis so that the internal fluid passages communicate with each other. The passage comprises a female joint and a male joint movably provided in a disconnected state in which the passage is cut off and each is cut off, wherein the female joint has a cylindrical female body having a connection port on a distal end surface, and a cylindrical shape. A valve seat portion slidably provided along the axis in the female body, the tip of the inner hole being a female valve hole, and a valve seat portion pressed toward the connection port side by a female spring; A female valve provided to close the female valve hole from the outside thereof and fixed to the female body, wherein the male joint has a distal end portion having an outer diameter fitted into the connection port, and A male body having a male valve hole larger in diameter than the side valve, and a male valve hole in the male body A male side valve provided so as to be pressed and closed by a male side spring from one of the front end surface of the valve seat portion and the front end surface of the male body opposed thereto. In the fluid joint provided with an annular sealing member for sealing, the male valve is formed in such a manner that the entire surface of an end face facing the female valve is formed on a sealing surface and the annular sealing member is in contact with a mating side. The surface is formed so as to be in close contact with the entire surface of the opposed surface inside the annular seal member.

[0008] In the means of the present invention, the male valve is formed on the entire surface of the end surface facing the female valve as a sealing surface, and the sealing surface is opposed to the opposite surface when the annular sealing member is in contact with the mating side. Since it is formed so as to be in close contact with the entire area inside the annular seal member, no gap is formed between the male valve and the female valve when the fluid joint is connected, in which a different fluid exists.

It is preferable that a bulging portion is formed at the center of the sealing surface so as to bulge toward the female valve and to be deformable in accordance with the contact of the female valve. A bulge is formed at the center of the seal surface toward the female valve and a bulge that can be deformed according to the contact of the female valve is formed. When the contact is made, since the contact starts from the center of the sealing surface and reaches the peripheral portion, that is, since the contact surface expands from the central portion to the peripheral portion,
Since the different fluid is pushed outward, there is no possibility that the different fluid is sealed between the contact surfaces, and it is possible to prevent a void from being formed between both valves and the annular seal.

The seal surface is a sheet-shaped seal member, and the sheet-shaped seal member constitutes an end surface of the male valve facing the female valve and a peripheral portion thereof. Is good. Since the sealing surface is a sheet-shaped sealing member and constitutes the end face and the periphery thereof facing the female valve, a separate sealing member for sealing between the male valve and the male valve hole is not required, Further, it is possible to eliminate a gap in which different fluid enters between the male valve and the male valve hole in the valve closed state before the connection.

It is preferable that at least the entire outer surface forming portion of the male side valve is formed of an integral elastic resin material. Since at least the entire outer surface forming portion of the male side valve is made of an integral elastic resin material, the male side valve and the female side valve are not connected when the fluid joint is connected without particularly attaching a seal member to the male side valve. No gap is formed between the male side valve and the male side valve hole, and a gap between the male side valve and the male side valve hole can be eliminated.

It is preferable that a space is formed inside the bulging portion and a compressible material is sealed in the space. Since the compressible material is sealed in the void formed inside the bulging part, the adhesion between the bulging part and the female valve increases, and a gap through which a different fluid enters between the female valve and the male valve. Can be eliminated.

It is preferable that at least the portion of the male side valve, which is formed of an integral elastic resin material at least over the entire outer surface forming portion, is opposed to the female side valve and has a small thickness. By making it thin, the adhesion between the thin part and the female part increases.

It is preferable that one of the female side valve and the female side valve hole is formed of a sealing material on the entire contact surface with the other. Since the entire contact surface of one of the female valve and the female valve hole with the other is formed of a sealing material, a gap between the female valve and the female valve hole through which a different fluid enters is provided. Is not formed.

[0015]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. The fluid joint 20 is a female joint 2
1 and a male joint 22, and the basic configuration for connection and disconnection is substantially the same as the above-described conventional one. That is, the female joint 21 has a cylindrical female body 24 having a connection port 23 on the distal end surface, and a cylindrical body slidably provided along the axis in the female main body 24. A valve seat 28, which is a side valve hole 26 and is pressed toward the connection port 23 by a female spring 27, and a female valve hole 26 of the valve seat 28.
And a female valve 29 fixed to the female body 24 so as to close the male joint 22 from the outside thereof.
A male body 31 having a distal end portion having an outer diameter fitted into the connection port 23 and having a male valve hole 30 larger in diameter than the female valve 29 on the distal end surface; and a male valve hole 10 of the male body 11. And a male valve 33 provided so as to be closed by being pressed by a male spring 32 from the inside thereof. A sealing member, which is an annular sealing member for sealing one of the distal end surface of the valve seat portion 28 and the distal end surface of the male body 31 facing the valve seat portion 28, in the illustrated one, to the valve seat portion 28. A ring 34 is provided.

The main difference of the present embodiment from the conventional one is that a seal member 35 is provided on the female valve 29 and a seal member 36 is provided on the male valve 33. Seal member 3
5 is provided on the entire outer peripheral surface fitted into the female valve hole 26 of the female valve 29, and is provided by, for example, bonding.
In the closed state, as shown in FIGS. 1 and 2, the entire tapered peripheral surface that is in contact is in close contact, and the end faces of the female valve 29 and the valve seat 28 are on the same plane.

The seal member 36 of the male valve 33 is
3, the entire surface of the surface facing the female valve 29 side, that is, the entire surface facing the end surface of the female valve 29 and the end surface of the valve seat 28 inside the seal ring 34 is formed as a sealing surface. I have. The sealing member 36 is formed of a rubber-like elastically deformable sealing material in the form of a sheet having a predetermined thickness, and the sealing surface is separated from the joint as shown in FIG. A bulging portion 37 bulging toward
A back surface of the bulging portion 37 is formed in a cavity 38, and the cavity 38 is formed.
The inside is filled with a sponge 39 which is a compressible material. As a result, the front end surface of the male valve 33 becomes flat when pressed against the flat surface, and is brought into close contact with the entire flat surface. The seal member 36 is bonded to other metal parts of the male valve 33 by adhesion or the like. When the joint is cut off and the male valve hole 30 is closed by the male valve 33, the male member 31 at the tip of the male main body 31 is closed. It protrudes slightly from the opening surface of the side valve hole 30. The degree of protrusion is such that the male side valve 33 is pressed against a flat surface and is in a protruding state when the male side valve 33 is in close contact with the flat surface, due to the female valve 29, the end face of the valve seat 28, and the inside of the seal ring 34. This is in a degree corresponding to the shallow circular recess 40 formed (see FIG. 1).

The female joint 21 and the male joint 22 will be described. The female joint 21 has a pipe connecting portion 41 (or a connecting portion such as a hose) as a fluid passage.
Has an internal fluid passage 42 reaching the female valve hole 30 following the
A female valve support 43 is arranged at the center of the internal fluid passage 42, and the female valve 29 is fixedly supported by the female valve support 43. The female valve support portion 43 is constituted by a cylindrical insertion portion 44 and a plurality of support legs 45 extending radially from the outer periphery of the connection portion across the internal fluid passage 42 and continuing to the female body 24. I have. In the drawing, 46 is a cap nut for mounting the female valve, 47 is a keyway, and 48 is a detent for tightening the cap nut 46 with a half-moon key. Also,
49 is a seal ring, and 50 and 51 are bearing materials for a sliding surface. Reference numeral 52 denotes a communication hole which communicates the internal space forming the spring chamber of the female valve 29 with the outside world.

The male joint 22 has a pipe connecting portion 53 (or a connecting portion such as a hose) which is a fluid passage, and has an internal fluid passage 54 which reaches the male valve hole 30 following the connecting portion 53. A male valve support 55 is provided at the center of the internal fluid passage 54.
Are disposed, and the male valve 33 is supported by the male valve support 55. The male valve support portion 55 has a bottomed cylindrical shape, extends radially from the outer periphery across the internal fluid passage 54, and is supported by a plurality of support legs 56 that are continuous with the male body 31. A substantially cup-shaped male valve 3 is attached to the male valve support 55.
3 is slidably supported and is pressed into the male valve hole 30 by the male spring 32. In the drawing, 57 and 58 are seal rings, 59 is a bearing material of a sliding surface, and 60 is a communication passage which communicates the internal space forming the spring chamber of the male valve 33 to the outside.

The female joint 21 and the male joint 22 are respectively connected to the female body 2
4. The male body 31 is mounted on the mounting plates 61 and 62, and fluid passages are connected to the connecting portions 41 and 53, respectively, and are moved and held by a driving unit (not shown) so as to approach on a common axis. To be connected to each other, and moved away from each other to become a disconnected state. FIG. 1 shows a disconnected state, FIG. 2 shows a state in the middle of connection or disconnection, and FIG. 3 shows a connected state.

A second embodiment of the present invention will be described with reference to FIGS. Fluid coupling 20a of this embodiment
The seal member 63 at the distal end of the male valve 33 is formed with a short cylindrical portion 64 having a tapered outer edge in addition to the portion forming the seal member 36 as compared with the fluid joint 20. The only difference is that the outer peripheral surface of the short cylindrical portion 64 is formed so as to be in close contact with the inner peripheral surface of the male valve hole 30 so that the male valve hole 30 can be securely closed. Thereby, the seal ring 57 is omitted. Other parts are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof will be omitted.

A third embodiment of the present invention will be described with reference to FIGS. Fluid coupling 20b of this embodiment
The front end 65 of the male valve 33, the tapered distal end 67 that fits into the male valve hole 30, and the cylindrical portion 68 that fits into the valve support 55 are different from the fluid joint 20. ,
Synthetic resin material having elasticity integrally, for example, nylon,
The difference is that they are made of polyacetal or equivalents.
9 is formed of a metal material. In this case, the front end portion 65 having the bulging portion 37 is formed to be thin, and a cavity 70 is formed on the back surface. The cavity 70 is formed through the center hole 71 of the spring receiving portion 69 inside the male valve 33. (Spring chamber) 72
Is in communication with In this configuration, the seal ring 57 is omitted as in the second embodiment. If a small annular protrusion is provided in the middle of the outer peripheral surface of the tapered distal end outer peripheral portion 67, the small annular protrusion is deformed when the valve is closed, and the inner peripheral surface of the female valve hole 30 is formed together with the peripheral distal end outer peripheral portion 67. Adhere to the surface,
At this time, the surface pressure at the portion where the small annular projection is located increases, and the male valve hole 30 can be closed more reliably. Other parts are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof will be omitted.

When connecting the fluid couplings 20, 20a, 20b of the first, second, and third embodiments, first, the front end of the female valve 29 and the front end of the male valve 33 are connected. The bulging portion 37 of the surface comes into contact, and the bulging portion 37 is deformed flat,
Due to this deformation, the different fluid between the contact portions is pushed out, and the circular shallow recess 40 formed on the front end side of the female valve 29 is just filled in by the front end of the male valve 33, so that the inside is different. A state in which no fluid exists (the state shown in FIGS. 2, 5, and 8), and at this time, the seal ring 34 comes into contact with the front end surface of the male body 31. In this state, the pressing state proceeds, and then the female valve hole 26 and the male valve hole 30 are opened. The state in which the female valve 29 is closed with the female valve hole 26 is a state in which there is no gap where a different fluid remains by the seal member 35, and the male valve 33 is closed with the male valve hole 30 closed. The state in which there is no gap is such that a different fluid remains due to the seal member 36, the seal member 63, or the front end 65. Therefore, when the female valve hole 26 and the male valve hole 30 are opened, different fluids do not mix with the fluid in the internal fluid passages 42 and 54.

[0024]

According to the first aspect of the present invention, the sealing surface is formed in a state where the entire surface of the male valve facing the female valve is formed on the entire sealing surface and the annular sealing member is in contact with the counterpart. Are formed so as to be in close contact with the entire inner surface of the annular seal member on the opposing surface, so that a gap in which a different fluid exists between the male valve and the female valve is not formed at the time of connection of the fluid joint. In this case, there is an effect that a different fluid can be prevented from being mixed into the internal fluid. In addition, this has an effect that the device can be used without any trouble in a microgravity environment. According to the second aspect of the present invention, since the bulge is formed at the center of the seal surface toward the female valve and is deformable in accordance with the abutment of the female valve, the bulge is formed at the time of connection. It is possible to prevent a void from being formed between the valve and the annular seal.
This has the effect of preventing mixing of a different fluid into the internal fluid during connection. According to the third aspect of the present invention, it is possible to eliminate a gap in which a different fluid enters between the male valve and the male valve hole in the closed state before the connection, so that the mixing of the different fluid into the internal fluid is prevented. It has an effect that can be prevented. According to the fourth aspect of the present invention, at least the entire outer surface forming portion of the male valve is formed of an integral elastic resin material, so that a gap is formed between the male valve and the female valve, through which a different fluid enters. In addition, since a gap between the male side valve and the male side valve hole through which a different fluid enters can be eliminated, an effect of preventing mixing of the different fluid into the internal fluid at the time of connection can be achieved. According to the fifth aspect of the invention, since the compressive material is sealed in the void formed inside the bulging portion, the adhesion between the male valve and the female valve increases, so that the male valve and the female valve are Can be eliminated, and mixing of the different fluid into the internal fluid can be prevented. According to the sixth aspect of the present invention, since the portion of the male valve facing the female valve is made thinner to increase the adhesion, an effect of preventing mixing of a different fluid into the internal fluid at the time of connection can be obtained. . The invention according to claim 7 is such that one of the female valve and the male valve hole is entirely formed with a sealing material on a contact surface with the other, and is provided between the female valve and the female valve hole. Since the gap into which the different fluid enters is prevented from being formed, an effect of preventing the mixing of the different fluid into the internal fluid at the time of connection is achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a detached state according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view showing a state in the middle of connection or disconnection in the embodiment.

FIG. 3 is a vertical sectional front view showing the connection state of the embodiment.

FIG. 4 is a longitudinal sectional front view showing a detached state according to the second embodiment of the present invention.

FIG. 5 is a partial vertical sectional front view showing a state in the middle of connection or disconnection in the embodiment.

FIG. 6 is a partial vertical sectional front view showing the connection state of the embodiment.

FIG. 7 is a longitudinal sectional front view showing a detached state according to a third embodiment of the present invention.

FIG. 8 is a partial longitudinal front view showing a state in the middle of connection or disconnection in the embodiment.

FIG. 9 is a partial vertical sectional front view showing a connection state of the embodiment.

FIG. 10 is an enlarged longitudinal sectional front view of a main part showing a state in the middle of connection or disconnection of a conventional fluid joint.

[Explanation of symbols]

 Reference Signs List 20 joint for fluid 20a joint for fluid 20b joint for fluid 21 female joint 22 male joint 23 connection port 24 female body 25 inner hole 26 female valve hole 27 female spring 28 valve seat 29 female valve 30 male valve hole 31 Male body 32 Male side spring 33 Male side valve 34 Seal ring 35 Seal member 36 Seal member 37 Swelling part 38 Cavity 39 Sponge 40 Depression 41 Connection part 42 Internal fluid passage 43 Female valve support part 53 Connection part 54 Internal fluid passage 55 Male valve support 63 Seal member 64 Short cylindrical part with taper 65 Front end part 67 Outer peripheral part 68 Cylindrical part 69 Spring receiving part 70 Cavity

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisashi Kawada 2-39-1 Sumida, Sumida-ku, Tokyo (72) Inventor Hirokazu Tsuji 1-16-17-1 Fukuyoshidai, Nishi-ku, Kobe-shi, Hyogo Nabco Seishin Co., Ltd. in the factory

Claims (7)

[Claims] 1. A connection state in which each of the internal fluid passages is connected to a separate fluid passage and pressed against each other in the same axial line to communicate with each other, and the internal fluid passages are separated from each other and cut off respectively. A female joint and a male joint movably provided in a disconnected state, wherein the female joint has a cylindrical female body having a connection port on a distal end surface, and has a cylindrical shape along the axis in the female body. A valve seat slidably provided, the tip of the inner hole of which is a female valve hole, which is pressed toward the connection port by a female spring, and the female valve hole of the valve seat is closed from the outside. And a female valve fixed to the female body, wherein the male joint has a distal end portion having an outer diameter that fits into the connection port, and the male valve has a distal end surface larger in diameter than the female valve. A male body having a hole, and the male valve hole of the male body is closed by pressing it from the inside with a male spring. And a male valve provided as follows:
In a fluid joint, an annular seal member for sealing between the distal end surface of the valve seat portion and the distal end surface of the male body opposed thereto is provided, wherein the male valve is the female valve The entire surface of the end surface facing the seal member is formed on the seal surface, and the seal surface is formed so as to be in close contact with the entire inner surface of the annular seal member on the opposing surface in a state where the annular seal member is in contact with the counterpart. Characteristic fluid joint. 2. The fluid for a fluid according to claim 1, wherein a bulging portion bulging toward the female valve and deformable in accordance with the contact of the female valve is formed at a central portion of the sealing surface. Fittings. 3. The sealing surface is a sheet-shaped sealing member, and the sheet-shaped sealing member forms an end surface of the male valve facing the female valve and a peripheral portion thereof. The fluid coupling according to claim 1 or 2, wherein 4. The fluid coupling according to claim 1, wherein at least the entire outer surface forming portion of the male valve is formed of an integral elastic resin material. 5. The fluid joint according to claim 2, wherein a void is formed inside the bulging portion, and a compressible material is sealed in the void. 6. The fluid coupling according to claim 4, wherein a portion of said male valve facing said female valve is made thin. 7. The sealing valve according to claim 1, wherein the entire surface of one of the female valve and the female valve hole, which is in contact with the other, is formed of a sealing material. The fluid joint according to claim 5 or claim 6.