JP4222530B2 - Corgate pipe seal packing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal packing formed of a tubular cylindrical member and an elastic member interposed between the cylindrical member and a corrugate pipe having a cross section disposed on the inner periphery of the cylindrical member.
[0002]
[Prior art]
Usually, the hermetic seal with the corrugate tube inserted into the cylindrical member is such that an O-ring is attached to the concave portion of the corrugate tube, and this is inserted into the cylindrical member to seal the cylindrical member and the corrugate tube. .
[0003]
[Problems to be solved by the invention]
In this way, when an O-ring is attached to the corrugated recess of the corrugate tube and used to seal the cylindrical member and the corrugate tube, the corrugate tube is usually flexible, so that the corrugate tube is inserted into the cylindrical member. When this seal portion is bent, the corrugate tube is pulled on the outer peripheral side of the bend radius of the corgate tube, and the corrugate tube expands between the corrugated recesses, and on the inner peripheral side of the bend radius, the corgate tube is compressed on the contrary. The space between the ridges is narrowed.
[0004]
For this reason, the sealing O-ring attached to the corrugated recess of the corrugate tube enters into the corrugated recess particularly on the outer peripheral side of the bending radius, and cannot be brought into contact with the inner peripheral surface of the cylindrical member, so that the seal is not performed during use. was there.
In order to improve this situation, it is conceivable to increase the thickness of the O-ring. However, if the O-ring is made thicker, it becomes difficult to insert it into the cylindrical member. Collapsed, and there was a problem that good sealability could not be obtained.
The present invention overcomes the above-described problems and provides a seal packing for a corrugate tube that facilitates the insertion of a corrugate tube into a cylindrical member during piping and ensures sealing performance even when the seal portion is bent during use.
[0005]
[Means for Solving the Problems]
The gist of the present invention is an elastic seal packing in which a tubular cylindrical member and a cross section disposed on the inner periphery of the cylindrical member are interposed in a seal portion of a corrugated pipe having a wavy shape,
An annular portion having a shoulder contact surface that contacts the convex shoulder surfaces on both sides of the corrugated tube outer circumferential wave crest recess, an inner surface having a gap and an outer surface that contacts the inner circumferential surface of the cylindrical member, A seal packing for a corrugate tube comprising: a plurality of annular portions connected to each other at the outer surface of the corrugated portion of the corrugate tube in a state where a plurality of the annular portions are mounted on the outer peripheral corrugated recess portion of the corgate tube. It is.
[0006]
In the above, the inner peripheral surface of the connecting portion is in contact with the outer surface of the wavy ridge convex portion of the corrugate tube.
In the above, the outer peripheral surface of the connecting portion has a gap with the inner peripheral surface of the cylindrical member.
Moreover, in the above, the said annular part is the seal packing for corrugate pipe | tubes which may be mounted next to the corrugated pipe | tube outer periphery wave crevice recessed part or exceeding a wave crevice crevice.
[0007]
[Action]
The seal packing for a corrugate pipe according to the present invention has the above-described configuration, and normally abuts against the inner peripheral surface of the cylindrical member, and the compressive force that receives compression by this abutting escapes in the inner peripheral direction, and the inner surface is the bottom surface of the wavy crevice. Therefore, the elastic recovery force that escapes in the inner circumferential direction gives an appropriate contact compression force to both shoulder portions of the corrugate tube and the inner circumferential surface of the cylindrical member for sealing. .
[0008]
In addition, when both pipes are bent at this seal portion, the gap between the crests is widened on the outer peripheral side of the bending radius, but there is a connecting portion that connects the annular portion between the annular portions of the packing. The inner surface is in contact with and supported by the undulating convex portion, and the annular portion is prevented from entering the undulating concave portion. For this reason, the sealing state between the inner surface of the cylindrical member and the corrugate tube is maintained, and the annular portion is prevented from entering deeply into the bottom surface of the corrugated portion of the corrugate tube. Maintained.
By making the inner surface of the connecting portion a contact portion in contact with the outer surface of the corrugated tube, the good sealing performance between the inner surface of the cylindrical member and the outer surface of the corrugated tube is always maintained.
Since the outer peripheral surface of the connecting portion has a gap with the inner peripheral surface of the cylindrical member, the inner peripheral surface of the cylindrical member is surely contacted, and excessive compression of the packing is prevented by this gap.
[0009]
Even if the corrugate tube 30 moves in the axial direction in the cylindrical member 20, the annular portions 14 of the packing are connected to each other by the connecting portion, so the annular portion 14 does not rotate in the undulating recess of the corrugate tube 30, Even if tensile stress is applied to the corrugate tube 30, the annular portion 14 attached to the undulation recess is connected by the connecting portion 15. Therefore, the deformation of the undulation recess is less likely to occur at the packing attachment portion, and at locations other than the packing attachment portion. This produces good sealing properties.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a view showing a free state of a seal packing 10 for a corrugate pipe according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing a state in which the packing 10 is mounted between a cylindrical member 20 and a corrugate pipe 30. is there.
In FIG. 1 showing the free state of the seal packing, the outer diameter D of the outer surface 11 of the packing 10 is set larger than the diameter of the inner peripheral surface 21 of the cylindrical member 20 to be used. For the dimension of 34 mm, the packing outer diameter D is set at 36 mm in anticipation of the compression allowance of the packing outer diameter.
[0011]
In addition, the inner diameter d of the packing inner surface 12 in the free state is larger than the diameter of the corrugated recess bottom surface 31 of the corrugate tube 30 and is provided with a gap T. A shoulder abutment surface 13 that expands in a fan shape from the inner surface 12 having a 2 mm larger diameter and a 1 mm packing clearance T in the radial direction and abuts against both shoulder portions 32 of the corrugated convex portion 30 of the corgate pipe 30 is provided. 14 is formed.
In this embodiment, four annular portions 14 are provided so as to enter the adjacent wave crests, and the annular portions 14 are connected to each other by a connecting portion 15. In this embodiment, the connecting portion 15 has a band shape, the outer surface of the connecting portion 15 is provided in a dimension having a gap S with the inner peripheral surface 21 of the cylindrical member 20, and the inner surface is in contact with the outer surface of the corgate tube 30. Are provided in the same inner peripheral shape as the outer surface of the wavy mountain convex portion.
Even if the annular portion 14 does not enter the adjacent undulation recesses, it is sufficient that the annular portion 14 is included in a plurality of undulation recesses. It may be connected by the connecting part 15.
[0012]
When the corrugate tube 30 is inserted into the inner peripheral surface of the cylindrical member 20 with the seal packing 10 mounted, the outer surface of the packing 10 comes into contact with the inner peripheral surface of the cylindrical member 20 and is compressed. Due to this compressive force, the packing 10 escapes to a gap T between the bottom surface of the corrugated concave portion of the corrugate tube 30 and is deformed as shown in FIGS. The elastic restoring force of the packing that escapes to the gap T acts in the outer diameter direction as shown in the figure, and acts on the inner peripheral surface 21 of the cylindrical member 20. For this reason, the packing 10 applies a compressive force to the inner peripheral surface 21 of the cylindrical member and the wavy mountain shoulders 32 of the corrugate tube 30 with an elastic restoring force due to an appropriate elastic deformation, and the life of the seal packing is ensured over a long period of time. Stable sealability can be obtained. Further, since an excessive compressive force is not generated, the corrugated tube wavy shape is not deformed.
[0013]
Further, even when the seal portion is bent in this state, the space between the corrugated recesses of the corrugate tube 30 is widened on the outer peripheral side of the bending radius, but there is a connecting portion 15 that connects the annular portion 14 of the packing 10. The annular portion 14 of the packing does not enter deeply into the bottom surface.
Further, since the outer surface of the connecting portion 15 has a clearance S with the inner peripheral surface of the cylindrical member, the compressive force of the connecting portion 15 escapes to the clearance S even on the inner peripheral side of the bending radius and maintains an appropriate compressive force. Therefore, the sealing state between the inner surface of the cylindrical member 20 and the corrugate tube 30 is maintained, and excessive compression of the packing is prevented, so that the corrugated tube 30 is prevented from collapsing and the good sealing state is maintained. The
[0014]
Even if the corrugate tube 30 moves in the axial direction in the cylindrical member 20, the annular portion 15 of the packing is connected by the connecting portion 15, so that the annular portion 14 of the packing is rotated in the undulated recess of the corrugate tube 30. In addition, even if a tensile stress is applied to the corrugate tube 30, the annular portion 14 attached to the wave mountain recess is connected by the connecting portion. Therefore, even if the deformation of the corrugate tube wave mountain recess occurs at a place other than the seal portion, Deformation of the wavy crevice at the seal part to which the packing 10 is attached hardly occurs, and a good sealing property is obtained.
Further, since the inner surface of the connecting portion 15 is in contact with the outer surface of the corrugate tube 30, the outer peripheral surface of the corgate tube 30 is always in contact with it, and a better sealing performance is maintained.
[0015]
【The invention's effect】
As described above, the seal packing for a corrugate pipe of the present invention is always sealed with an appropriate compressive force as a seal for sealing the corrugate pipe and the cylindrical member, and does not deform the corrugated pipe's wavy shape, and can be bent or axially used. Even if there is a deformation in the direction, it maintains a stable sealing state and has a good sealing property for a long time.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a seal packing for a corrugate pipe showing an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing a sealed state interposed between a cylindrical member and a corrugate tube according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Corrugate pipe seal packing 11 Packing outer surface 12 Packing inner surface 13 Shoulder contact surface 14 Annular portion 15 Connecting portion 20 Cylindrical member 21 Inner peripheral surface 30 of the cylindrical member Part

Claims (4)

In the elastic seal packing in which the cross section disposed on the inner periphery of the tubular cylindrical member and the cylindrical member is interposed in the seal portion of the corrugated pipe having a wavy shape,
An annular portion having a shoulder contact surface that contacts the convex shoulder surfaces on both sides of the corrugated tube outer circumferential wave crest recess, an inner surface having a gap, and an outer surface that contacts the inner circumferential surface of the cylindrical member. A seal packing for a corrugate tube comprising: a plurality of annular portions connected to each other at the outer surface of the corrugated portion of the corrugate tube in a state where a plurality of the annular portions are mounted on the outer peripheral corrugated recess portion of the corgate tube. . The seal packing for a corrugate tube according to claim 1, wherein an inner peripheral surface of the connecting portion is in contact with an outer surface of a wavy convex portion of the corgate tube. The seal packing for corrugate pipes according to claim 1, wherein an outer peripheral surface of the connecting portion has a gap with an inner peripheral surface of the cylindrical member. 4. The seal packing for a corrugate tube according to claim 1, wherein the annular portion is mounted adjacent to or around the corrugated concave portion of the corrugate tube at an interval.

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