JP5184756B2 - Seal member - Google Patents

Description

  The present invention relates to an elastic seal member that is formed along the circumferential direction on the inner surface of a receiving port and seals the gap between the inner surface of the receiving port and the outer surface of the insertion port.

  A conventional seal member includes a fitting portion that is fitted in a recess formed on the inner surface of the receiving port, a valve portion that is positioned inward with respect to the tube axis direction from the fitting portion, and the fitting portion and the valve. And an intermediate portion interposed between the portions, and seals the gap between the inner surface of the receiving port and the outer surface of the insertion port (see, for example, Patent Document 1).

JP-A-5-231570 (2nd page, FIG. 1)

  However, in Patent Document 1, when the insertion port is inserted into the receiving port, the intermediate portion is compressed by the outer surface of the insertion port that is inserted inward of the receiving port, and is fitted in a predetermined position of the recess. In some cases, the fitting portion may be displaced from the predetermined position or may be disengaged from the recess, so that the gap between the inner surface of the receiving port and the outer surface of the insertion port cannot be accurately sealed.

  The present invention has been made paying attention to such a problem, and even when the insertion port is inserted into the receiving port, the valve portion is in a state where the fitting portion of the seal member is firmly fitted in the recess. It is an object of the present invention to provide a seal member that can compress a gap to seal a gap.

In order to solve the above-mentioned problem, a seal member according to claim 1 of the present invention includes a fitting portion fitted in a recess formed along the circumferential direction on the inner surface of the receiving port, and the fitting portion. A valve portion that is positioned inward of the receiving port with respect to the tube axis direction and seals a gap between an inner surface of the receiving port and an outer surface of the insertion port inserted into the receiving port in a watertight manner, and the fitting The fitting portion and the intermediate portion that are interposed between the joint portion and the valve portion and have an inner peripheral surface formed substantially parallel to the tube axis in a state where the insertion port is not inserted. A sealing member having elasticity,
The outer surface and the inner surface of the intermediate portion have a predetermined length substantially parallel to the tube axis direction, and are thinner in the direction perpendicular to the tube axis than the valve portion when the insertion port is not inserted. The insertion port that is formed, the outer surface of the intermediate portion forms a gap with the inner surface of the receiving port, and the inner surface of the fitting portion and the intermediate portion is inserted inward of the receiving port It is formed so as to be close without being compressed by the outer surface of the
The valve portion is composed of a ring body having a substantially circular cross section when the valve portion is not compressed, and the dimension of the valve portion in a direction orthogonal to the tube axis is the inner surface of the receiving port. Is formed larger than the dimension between the outer surface of the insertion port and the outer surface of the insertion port that is inserted inward of the receiving port, so that the gap expands toward the gap. It is characterized by being formed so as to be sealed.
According to this feature, since the outer surface of the insertion port inserted into the receiving port is inserted inward of the receiving port without compressing the fitting portion and the intermediate portion, the outer surface of the insertion port inserted into the receiving port Thus, the valve portion can be compressed to seal the gap in a state where the fitting portion is firmly fitted without being displaced from the recess.
The inner peripheral surfaces of the fitting portion and the intermediate portion are formed substantially parallel to the tube axis, the outer surface and the inner surface of the intermediate portion have a predetermined length substantially parallel to the tube axis direction, and the valve Since the cross-sectional shape of the portion is composed of a ring body that is formed in a substantially circular shape in a state where it is not compressed, the intermediate portion is not compressed in the direction orthogonal to the tube axis by the outer surface of the insertion port inserted into the receiving port. Only the valve part can be compressed, and when the valve part is compressed by the outer surface of the insertion port inserted into the receiving port, the valve part and the fitting part are separated by a predetermined length. The part is not affected by the compression of the valve part, and the stress due to the compression is evenly applied to the peripheral part of the valve part composed of the ring body, so the gap between the inner surface of the receiving port and the outer surface of the insertion port is stable. Sealed. Moreover, it is easy to mold the seal member.
In addition, since the intermediate portion is formed thin in the direction perpendicular to the tube axis, when the valve portion is compressed, the valve portion faces the gap formed between the intermediate portion and the inner surface of the receiving port. Therefore, the resistance required for compression of the valve portion is small.

  Examples of the present invention will be described below.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a schematic view showing an arrangement state of pipe members connected by a seal member in an embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing a joint portion that is a receiving port into which a seal member is fitted and a tip portion that is an insertion port. FIG. 3 (a) is a partial cross-sectional view showing a situation where the tip part which is an insertion port is inserted into a joint part which is a receiving port, and FIG. It is. FIG. 4 is an enlarged cross-sectional view showing a modification of the seal member. FIG. 5 is an enlarged cross-sectional view showing the regulating device.

  First, as shown in FIG. 1 of the present embodiment, the sealing member of the present invention includes, for example, a straight pipe 11 or a T-shaped pipe or an elbow pipe 2 constituting a pipe member 1 disposed in the ground. For example, fluid such as water and sewage or gas flows down or a wire or the like is routed through a path formed inside the pipe, which is used as one member of a joint part to be connected.

  In particular, existing buried objects 3 such as existing pipes or existing cables are often buried in the ground, and in order to avoid the buried objects 3 and to arrange the pipe member 1, By connecting the straight pipe 11 or the bend pipe 13 and connecting the pipes, a desired piping path can be configured. Thus, there are a wide variety of members constituting the piping path, and the joints connecting the respective members are required to be sealed without leakage of the fluid flowing down the piping.

  As shown in FIG. 2, the elbow pipe 2 into which the seal member 8 of the present invention is fitted has a joint portion 5 that is a receiving port at the end, and the joint portion 5 is a pipe of the elbow pipe 2. The inner diameter of the joint portion is larger than the inner diameter of the portion 6, and a concave portion 5 a provided along the circumferential direction is formed on the inner peripheral surface of the joint portion.

  As will be described later, the seal member 8 of the present invention includes a fitting portion 8a fitted into a concave portion 5a formed along the circumferential direction on the inner surface of the joint portion 5, and a tube of the elbow pipe 2 rather than the fitting portion 8a. The gap between the inner surface of the joint portion 5 and the outer surface of the distal end portion 12 of the straight pipe 11 that is an insertion port inserted into the joint portion 5 is watertight. And a middle portion 8b interposed between the fitting portion 8a and the valve portion 8c, and a ring body having an outer diameter substantially the same as the inner diameter of the joint portion 5, It consists of a rubber body having elasticity.

  The sealing member 8 has a fitting portion 8 a fitted in a circumferential direction in a recess 5 a formed on the inner surface of the joint portion 5. Further, in the fitted state, the valve portion 8c is positioned inwardly in the direction of the tube axis C of the elbow tube 2, and as shown in FIG. In a state where the distal end portion 12 is not yet inserted and the valve portion 8c is not compressed, the cross-sectional shape is formed in a substantially circular shape, and the inner peripheral surface is a tube as compared with the fitting portion 8a and the intermediate portion 8b. It bulges toward the axis C.

  An intermediate portion 8b of the seal member 8 fitted in the concave portion 5a on the inner surface of the joint portion 5 is formed substantially parallel to the tube axis C direction. The intermediate portion 8b is formed thinner in the direction perpendicular to the tube axis C than the valve portion 8c, and a gap K is formed between the intermediate portion 8b and the inner surface of the receiving port. Further, the intermediate portion 8b has a predetermined length in the tube axis C direction.

  Further, an embodiment of the restricting device for preventing relative movement in the tube axis direction between the receiving port and the insertion port in the present invention will be described. The outer peripheral surface near the outer end of the joint portion 5 has a predetermined pitch in the circumferential direction. A bolt hole 5b is formed, and a pushing bolt 9 is formed as a restricting device for the receiving port and the inserting port that are screwed in the direction perpendicular to the tube axis C from the outside of the elbow tube 2. Further, a fixing pawl 10 is provided in the ring groove 7 formed along the circumferential direction on the inner circumferential surface near the outer end of the joint portion 5 at the tip of the push bolt 9. As shown in FIG. 2, in a state where the distal end portion 12 of the straight tube 11 that is still an insertion port is not inserted, the distal end of the fixed pawl 10 is not disturbed by insertion of the distal end portion 12 of the straight tube 11 described later. However, it is located outward from the inner peripheral surface of the joint part 5 in the direction orthogonal to the tube axis C.

  Next, the insertion of the distal end portion 12 of the straight pipe 11 that is the insertion port of the present embodiment into the joint portion 5 of the elbow tube 2 that is the receiving port will be described. The inner diameter of the distal end portion 12 is that of the elbow tube 2. The outer diameter of the distal end portion 12 is slightly smaller than the inner diameter of the joint portion 5, and the outer peripheral surface near the distal end of the straight pipe 11 faces the distal end. It is formed on a tapered surface 12a that is reduced in diameter.

  As shown in FIG. 3A, the straight pipe 11 is adjacent to the fitting portion 8 a and the intermediate portion 8 b of the seal member 8 in which the outer peripheral surface of the tip portion 12 is fitted to the inner peripheral surface of the joint portion 5. In a slightly contacted state, it is inserted inward of the joint portion 5 in the direction of the tube axis C, but the outer surface of the tip portion 12 does not compress the fitting portion 8a and the intermediate portion 8b of the seal member 8. As shown in FIG. 3B, the valve portion 8c is compressed to seal the gap between the inner surface of the joint portion 5 and the outer surface of the tip portion 12 as shown in FIG.

  By doing in this way, the valve part 8c is fitted in the state where the fitting part 8a of the seal member 8 is firmly fitted without being displaced from the concave part 5a by the outer surface of the tip part 12 inserted into the joint part 5. By compressing, the gap between the inner surface of the joint portion 5 and the outer surface of the tip portion 12 can be sealed.

  Moreover, when the valve portion 8c is compressed on the outer surface of the distal end portion 12 inserted into the joint portion 5 because the cross-sectional shape of the valve portion 8c is formed in a substantially circular shape when not compressed, the valve portion 8c is compressed. Since stress is equally applied to the peripheral surface of the valve portion 8c, the gap between the inner surface of the joint portion 5 and the outer surface of the tip portion 12 is stably sealed.

  Furthermore, the inner peripheral surfaces of the fitting portion 8a and the intermediate portion 8b of the seal member 8 are formed substantially parallel to the tube axis C, and in this way, the tip portion inserted into the joint portion 5 With the outer surface of 12, the fitting portion 8a and the intermediate portion 8b can seal the gap between the inner surface of the joint portion 5 and the outer surface of the tip portion 12 without being compressed in the direction orthogonal to the tube axis C. It is easy to perform the molding process related to the manufacture of

  As shown in FIG. 3 (a), the distal end portion 12 of the straight pipe 11 is inserted toward the inside of the joint portion 5, and the valve portion 8c is compressed by the outer peripheral surface of the distal end portion 12. The gap between the inner surface of the joint portion 5 and the outer surface of the tip portion 12 is sealed. Since the outer surface in the vicinity of the tip of the straight pipe 11 to be inserted inward of the joint part 5 is formed in the tapered surface 12a, the valve part is gradually moved toward the inner surface of the receiving port as the front end part 12 of the straight pipe 11 is inserted. Therefore, the valve portion is smoothly compressed in the gap between the inner surface of the receiving port and the outer surface of the insertion port, so that the gap can be reliably sealed as shown in FIG.

  As shown in FIG. 4 as a modified example of the seal member, the tube portion is located at a position where a part of the cross-sectional shape of the valve portion 8c ′ of the seal member 8 ′ contacts the tapered surface 12a of the distal end portion 12 to be inserted. It may be formed on a tapered surface 8c′1 that has an inward diameter reduction with respect to the direction of the axis C.

  By doing in this way, with insertion of the front-end | tip part 12 which is an insertion port, valve part 8c 'of sealing member 8' is a receiving port gradually, without pressing inward with respect to C to a pipe axis. Since the joint portion 5 is pressed more uniformly toward the inner surface, the valve portion 8c ′ is smoothly compressed in the gap between the inner surface of the receiving port and the outer surface of the insertion port, so that the gap can be reliably sealed.

  Further, if the valve portion 8c ′ is partially formed in the tapered surface 8c′1 as described above, the valve portion 8c ′ is used as the tube axis regardless of the shape of the distal end portion of the insertion port. There is an effect of sealing the gap by pressing uniformly toward the inner surface of the receiving port gradually without pressing inward against C.

  Further, the intermediate portion 8b of the seal member 8 is formed thinner than the valve portion 8c in the direction orthogonal to the tube axis C. By doing so, the intermediate portion 8b and the inner surface of the joint portion 5 are formed. Since there is a gap K between them, the valve portion 8c bulges toward the gap K when the valve portion 8c is compressed, so that the resistance required to compress the valve portion 8c is small.

  Furthermore, since the intermediate portion 8b has a predetermined length in the direction of the tube axis C, even if the valve portion is compressed on the outer surface of the insertion port inserted into the receiving port, the valve portion and the fitting portion are not Since it is separated by a predetermined length, the fitting part is hardly affected by the compression of the valve part, so the elasticity of the valve part is increased and the gap between the inner surface of the receiving port and the outer surface of the insertion port is sealed. The state can be further improved.

  The push-in bolt 9 is screwed from the outside of the ring groove 7 and abuts the outer periphery of the fixed pawl 10 so as to press the fixed pawl 10 against the outer peripheral surface of the straight pipe 11.

  As shown in FIG. 5, the fixed pawl 10 can tilt with the bottom surface of the push-in bolt 9 as a fulcrum in the ring groove 7, and when the straight pipe 11 tries to move relatively in the pipe axis direction away from the joint portion 5, A sharp blade 10a formed at the tip of the fixed claw 10 is formed in a cross-sectional shape so as to bite into the outer peripheral surface of the straight pipe 11 toward the pipe axis, as indicated by a two-dot chain line.

  Due to the relative movement of the straight pipe 11 and the joint portion 5, the fixed pawl 10 tilts in the ring groove 7, and this tilting is appropriately stopped in a state where the sharp blade 10 a bites into the outer peripheral surface of the straight pipe 11. The tilting of the fixed pawl 10 is stopped by contacting the tilting stop surface 7a outside the ring groove 7 at the maximum. However, when the tilting of the fixed pawl 10 stops, the amount of biting is maximized and the straight pipe 11 and the joint portion. Since the relative movement with respect to 5 is prevented, the straight pipe 11 and the joint part 5 do not move beyond a predetermined movement amount to cause water leakage.

  FIG. 6 shows a first modification of the regulating device.

  A fixed claw 23 having a spherical concave portion 23b formed at the top and two sharp blades 23a provided on the fluid pipe side is disposed in the ring groove 25 in a state where it can tilt with the tip of the push-in bolt 24 as a fulcrum. ing. A push-in bolt 24 having a spherical convex portion 24a engaged with the spherical concave portion 23b at the tip is screwed into the ring groove 25 substantially perpendicular to the tube axis. A tilt stop surface 25 a that prevents the tilting of the fixed pawl 23 from being excessively tilted is formed in the front and rear of the ring groove 25 in the axial direction. The outer anti-tilt surface 25a is provided so as to be substantially perpendicular to the tube axis, and the inner anti-tilt surface 25a is provided to fall outward.

  When the pipe connection device is attached, the fixed claw 23 has two sharp blades 23a and 23a in contact with the outer peripheral surface of the fluid pipe and is pushed by the push-in bolt 24 to bite into the fluid pipe by a predetermined amount. When the pipe connecting device and the fluid pipe begin to move relative to each other, the fixed pawl 23 tilts with the spherical convex portion 24a of the push-in bolt 24 as a fulcrum. The fixed pawl 23 continues to tilt toward the tube axis while increasing the amount of biting with relative movement, and the tilting is stopped as appropriate when the sharp blade 23a bites into the outer peripheral surface of the fluid pipe. The tilting of the fixed pawl 23 stops at the maximum contact with the outer tilting stop surface 25a as shown by the two-dot chain line, but when the tilting of the fixed pawl 23 stops, the relative movement between the pipe connecting device and the fluid pipe is stopped. Is prevented and prevents water leakage.

  FIG. 7 shows a second modification of the regulating device.

  A fixed claw 33 having a top formed in a circular arc shape and provided with a sharp blade 33a on the fluid pipe side is disposed in the ring groove 35 so as to be tiltable with the tip of the push-in bolt 34 as a fulcrum. A pushing bolt 34 having a conical tip is screwed into the ring groove 35 from the tube axis direction. A tilt stop surface 35 a for preventing the tilting of the fixed pawl 33 is formed on the front and rear in the axial direction in the ring groove 35. The outer tilting stop surface 35a is provided so as to be substantially perpendicular to the tube axis, and the inner tilting stop surface 35a is tilted toward the outer side.

  When the pipe connection device is attached, the fixed claw 33 has a sharp blade 33a in contact with the outer peripheral surface of the fluid pipe and is pushed by the push-in bolt 34 to bite into the fluid pipe by a predetermined amount. When the pipe connecting device and the fluid pipe start to move relative to each other, the fixed pawl 33 tilts with the contact point with the conical part of the push-in bolt 34 as a fulcrum. The fixed pawl 33 continues to tilt toward the tube axis while increasing the amount of biting with relative movement, and the tilting is stopped as appropriate when the sharp blade 33a bites into the outer peripheral surface of the fluid pipe. The tilting of the fixed pawl 33 stops at the maximum contact with the outer tilting stop surface 35a as shown by the two-dot chain line, but when the tilting of the fixed pawl 33 stops, the relative movement between the pipe connecting device and the fluid pipe is stopped. Is prevented and prevents water leakage.

  FIG. 8 shows a third modification of the regulating device.

  An inclined surface 43c that is angled with respect to the tube axis is formed on the outer side, and a fixed claw 43 provided with two sharp blades 43a on the fluid tube side slides in contact with the flat portion 44b of the push-in bolt 44. It is arranged in the ring groove 45 in a possible state. A pushing bolt 44 having a flat surface 44b formed at the tip thereof is screwed into the ring groove 45 from a direction substantially perpendicular to the inclined surface 43c so that the inclined surface 43c and the flat surface 44b move and come into contact with each other. It has been entered. A movement stop surface 45b is formed on the front and rear of the ring groove 45 in the axial direction so as to abut against the fixed pawl 43 and stop its movement.

  When attaching the pipe connecting device, the fixed claw 43 has two sharp blades 43a and 43a in contact with the outer peripheral surface of the fluid pipe and is pushed by the push-in bolt 44 to bite into the fluid pipe by a predetermined amount. When the pipe connecting device and the fluid pipe start to move relative to each other, the fixed pawl 43 slides in the pipe axis direction while the flat portion 44b of the push-in bolt 44 and the inclined surface 43c are in contact with each other. The fixed pawl 43 moves while increasing the amount of biting by the wedge action with the relative movement, and this movement is stopped appropriately when the sharp blade 43a bites into the outer peripheral surface of the fluid pipe. The movement of the fixed pawl 43 stops at the maximum contact with the outer movement stop surface 45b as shown by the two-dot chain line, but when the movement of the fixed pawl 43 stops, the relative movement between the pipe connecting device and the fluid pipe is stopped. Is prevented and prevents water leakage.

  FIG. 9 shows a fourth modification of the regulating device.

  In this regulating device, a female screw 53d portion into which a push-in bolt 54 is screwed is formed, a fixed claw 53 provided with two sharp blades 53a on the fluid pipe side, and an inclined surface 55c angled with respect to the pipe axis. Is formed on the inner surface of the ceiling of the ring groove 55, a long hole 55d is provided in the ceiling, and a ring-shaped groove 55 in which movement stop surfaces 55b are formed on both surfaces in the axial direction, and a large disc-shaped member that contacts the inclined surface 55c. The diameter portion 54c is integrally formed, and includes a push-in bolt 54 provided with a male screw portion 54d at the tip.

  The fixed pawl 53 is screwed into the male thread portion 54d of the push-in bolt 54 inserted through the elongated hole 55d, and is disposed in the ring groove in a state where the large-diameter portion 54c of the push-in bolt 54 and the inclined surface 55c are slidable. ing.

  When the pipe connection device is attached, the fixed claw 53 has two sharp blades 53a and 53a in contact with the outer peripheral surface of the fluid pipe and is pushed by the push-in bolt 54 to bite into the fluid pipe by a predetermined amount. When the pipe connecting device and the fluid pipe start to move relative to each other, the fixed pawl 53 moves together with the pipe, and the push-in bolt 54 screwed to the fixed pawl 53 is also in contact with the large diameter portion 54c and the inclined surface 55c. Slide in the direction. The fixed pawl 53 moves while increasing the amount of biting by the wedge action of the large-diameter portion 54c and the inclined surface 55c, and this movement is appropriately stopped in a state where the sharp blade 53a bites into the outer peripheral surface of the fluid pipe. The movement of the fixed pawl 53 stops at the maximum contact with the outer movement stop surface 55b as shown by the two-dot chain line, but when the movement of the fixed pawl 53 stops, the relative movement between the pipe connecting device and the fluid pipe is stopped. Is prevented and prevents water leakage.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the insertion port and the receiving port connected to each other constitute a pipe member composed of the elbow pipe 2 and the straight pipe 11 as shown in FIGS. The insertion port and the receiving port used are not necessarily limited to the elbow tube 2 and the straight tube 11 as long as they have a joint portion connectable to the end portion, for example, a T-shaped tube having three end portions, or a flexible tube. It may be a hose having a property. Further, the insertion port and the receiving port may constitute a part of various pumps or storage tanks.

  Moreover, in the said Example, although the member used for fixing of an insertion port and a receiving port is comprised by the pushing bolt 9 which has the fixing claw 10 ahead, if this fixing is made appropriate, it will be fixed. The structure of the member to be used is not necessarily limited to the above embodiment.

  In the above embodiment, the fixed pawl is provided so as to bite into the outer peripheral surface of the straight pipe 11 when the straight pipe 11 moves in one direction. It may be provided symmetrically so that it acts on either the left or right movement, and may be provided so as to bite into the outer peripheral surface of the straight pipe 11 even when the straight pipe 11 moves in the other direction.

It is the schematic which shows the arrangement | positioning condition of the pipe line member connected by the seal member in the Example of this invention. It is a partial cross section figure which shows the joint part which is a receiving port by which the sealing member was fitted, and the front-end | tip part which is an insertion port. (A) is a partial cross section figure which shows the condition where the front-end | tip part which is an insertion port is inserted in the coupling part which is a receiving port, Similarly (b) is a partial cross section figure which shows the inserted condition. . It is the expanded sectional view which showed the modification of the sealing member. It is an expanded sectional view which shows a control apparatus. It is a 1st modification of a control apparatus. It is a 2nd modification of a control apparatus. It is a 3rd modification of a control apparatus. It is a 4th modification of a control apparatus.

Explanation of symbols

1 Pipeline member 2 Elbow pipe 3 Buried object 5 Joint part (receiving port)
5a Recessed portion 5b Bolt hole 6 Pipe portion 7 Ring groove 7a Tilt stop surface 8, 8 'Seal member 8a Fitting portion 8b Intermediate portion 8c, 8c' Valve portion 8c'1 Tapered surface 9 Pushing bolt 10 Fixed claw 10a Sharp blade 11 Straight Tube 12 Tip (Inlet)
12a Tapered surface 13 Bend tube 23 Fixed pawl 23a Sharp blade 23b Spherical concave portion 24 Push-in bolt 24a Spherical convex portion 25 Ring groove 25a Tilt stop surface 33 Fixed pawl 33a Sharp blade 34 Push bolt 35 Ring groove 35a Tilt stop surface 43 Fixed pawl 43a Pointed blade 43c Inclined surface 44 Push bolt 44b Flat portion 45 Ring groove 45b Movement stop surface 53 Fixed pawl 53a Pointed blade 53d Female thread portion 54 Push bolt 54c Large diameter portion 54d Male screw portion 55 Ring groove 55b Movement stop surface 55c Inclined surface 55d Long Hole C Pipe axis K Air gap

Claims (1)

A fitting portion that is fitted in a recess formed along the circumferential direction on the inner surface of the receiving port, and is located on the inner side of the receiving port with respect to the tube axis direction than the fitting portion; A valve portion that seals a gap between the inner surface and the outer surface of the insertion port inserted into the receiving port in a watertight manner, and is interposed between the fitting unit and the valve unit, and an inner peripheral surface is inserted into the insertion port. In the state that is not done, the fitting member and the intermediate portion that are formed substantially parallel to the tube axis, and is a sealing member having elasticity,
The outer surface and the inner surface of the intermediate portion have a predetermined length substantially parallel to the tube axis direction, and are thinner in the direction perpendicular to the tube axis than the valve portion when the insertion port is not inserted. The insertion port that is formed, the outer surface of the intermediate portion forms a gap with the inner surface of the receiving port, and the inner surface of the fitting portion and the intermediate portion is inserted inward of the receiving port It is formed so as to be close without being compressed by the outer surface of the
The valve portion is composed of a ring body having a substantially circular cross section when the valve portion is not compressed, and the dimension of the valve portion in a direction orthogonal to the tube axis is the inner surface of the receiving port. Is formed larger than the dimension between the outer surface of the insertion port and the outer surface of the insertion port that is inserted inward of the receiving port, so that the gap expands toward the gap. A sealing member formed so as to seal.

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