JP2019007583A - Pipe end sealing plug - Google Patents

Abstract

To provide a pipe end sealing plug capable of being surely prevented from jumping out from a pipe end due to fluid pressure.SOLUTION: A pipe end sealing plug comprises a seal part 3 tightly adhering to a pipe inner surface, and a grip part 4 pressure-welded to the pipe inner surface. In the grip part 4, a fluid passage 13 for passing fluid is provided. The grip part 4 is arranged on a depth side in a flow passage direction with respect to the seal part 3. When a pipe end sealing plug 1 is pushed and moved with fluid pressure acting on the seal part 3, the seal part 3 is pushed out to an outward side of a pipe end. The flow passage 13 of the grip part 4 is configured to release fluid pressure, to prevent the pipe end sealing plug 1 from jumping out.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tube end sealing plug that is inserted into a tube end portion to prevent outflow of fluid.

  In general, when inspecting various pipes in a building for water leaks, supply pipes with water and air to the pipes with pipe ends connected to various facilities such as faucets using pipe end sealing plugs. In this case, it is checked whether there is water or air leakage from the piping.

  As a tube end sealing plug, for example, in Patent Document 1, an elastic cylinder 103 having a diameter smaller than that of a pipe 102 and a compression cylinder 104 are inserted into the shaft of an axial long bolt 101 and a nut 105 is screwed into the axial long bolt 101. A water stop cock with the above structure is disclosed. The water stop cock rotates the nut 105 and compresses the elastic cylinder 103 to expand the elastic cylinder 103 outward and fix it to the inner wall of the pipe 102.

  Further, the water faucet of Patent Document 1 is obtained by connecting a metal ring 107 to an axial bolt 101 through a chain 106 and extrapolating the metal ring 107 to a pipe 102. As a result, when the metal ring 107 is pulled through the axial bolt 101 and the chain 106, the metal ring 107 is locked to the outer wall of the pipe 102, and the water stop cock pops out due to the water pressure of the pipe 102. To prevent.

JP-A-8-54094 (paragraphs 0008, 0010, 0011, FIG. 1)

  However, in the water stopcock of Patent Document 1, the metal ring is inclined and caught on the pipe when trying to jump out by water pressure, but the metal ring is merely extrapolated to the pipe gently. The stopcock with such a structure can be easily detached from the pipe because the metal ring does not act strongly to tilt the metal ring when it is able to withstand water pressure by itself, and the metal ring directly receives external force. It is done.

  Thereby, in the stop cock of patent document 1, even if an excessive water pressure acts on a stop cock after a metal ring removes from a pipe, or even if a metal ring remains extrapolated to a pipe There is a risk that the stop cock will come out in several times and the metal ring will gradually come off the pipe, causing the stop cock to pop out.

  An object of this invention is to provide the pipe end sealing plug which can prevent reliably the jumping out from the pipe end by fluid pressure.

  In order to achieve the above object, a pipe end sealing plug according to the present invention is inserted into a pipe end part to prevent the outflow of fluid, and a seal part tightly sealing the inner surface of the pipe, A grip portion that contacts the surface and obtains a frictional force, and the grip portion has a fluid passage that allows fluid to pass therethrough, and is disposed behind the seal portion in the flow path direction when viewed from the tube end side. Is.

  According to the above configuration, since the grip portion having the fluid passage is provided in addition to the seal portion, the grip portion can be brought into contact with the inner surface of the tube without being pressed by the fluid pressure in the tube, thereby obtaining a frictional force. In addition, it is possible to increase the resistance against the pipe end sealing plug coming out. Moreover, since the grip portion is disposed on the back side of the seal portion, even if the pipe end sealing plug is pushed and moved by the fluid pressure acting on the seal portion, the seal portion is pushed out of the pipe end. The fluid pressure can be released from the fluid passage of the grip part, and the grip part can be left at the pipe end part to prevent the pipe end sealing plug from popping out.

  Moreover, it is good also as a structure which provided the rubber ring which has a seal part and a grip part, and a pair of narrow pressure member which narrows this rubber ring to a flow path direction, and expands it to radial direction.

  According to this configuration, since the seal portion and the grip portion are integrally formed as a rubber ring, the seal portion is tightly sealed to the inner surface of the tube by sealing with the narrow pressure member, and the grip portion is sealed to the inner surface of the tube. The frictional force can be obtained by contacting the surface. Moreover, since the seal portion and the grip portion are inflated by a common narrow pressure operation, the adhesiveness required for the seal portion and the friction required for the grip portion can be obtained simply by setting the seal portion and the grip portion to a predetermined shape. Force can be set to a suitable balance.

  The rubber ring may not only be squeezed and expanded in the direction of the flow path, but the rubber ring may be directly expanded outward in the radial direction by using the wedge principle, etc. You may make it form a grip part separately and inflate each by separate operation.

  In addition, the grip portion is formed in a gear shape formed by alternately arranging protrusions and fluid passages in contact with the inner surface of the pipe in the circumferential direction, and the protrusion protrudes radially outward from the seal portion. You may set to the magnitude | size to do.

  According to this configuration, since the grip portion is in the shape of a gear and the protrusions and the fluid passages are alternately arranged, the contact pressure can be concentrated on the protrusion while uniformly contacting the inner surface of the pipe as a whole. By increasing the amount of deformation of the protrusion due to the contact pressure, a stable contact state can be obtained. In addition, since the protruding portion is set to a size that protrudes radially outward from the seal portion, it is possible to increase the frictional force acting on the grip portion and more reliably prevent the tube end sealing plug from popping out.

  As described above, according to the present invention, a grip portion having a fluid passage is provided separately from a seal portion on a pipe end sealing plug that is inserted into various pipes to prevent outflow of fluid. It arrange | positions in the back | inner side in the flow-path direction. As a result, even if the tube end sealing plug that receives fluid pressure is pushed and moved, after the seal portion is pushed out of the tube end, the fluid pressure can be released from the fluid passage of the grip portion. The grip portion remaining at the end can prevent the tube end sealing plug from popping out.

The perspective view of the pipe end sealing plug which concerns on this invention Disassembled perspective view of tube end sealing plug The upper half is a side view of a tube end sealing plug that seals the tube end, and the lower half is a cross-sectional view of the tube end sealing plug that seals the tube end. The upper half is a side view of the tube end sealing plug extruded from the seal portion, and the lower half is a cross-sectional view of the tube end sealing plug extruded from the seal portion. Cross-sectional view of a conventional water stop cock

  Hereinafter, the form for implementing the pipe end sealing plug concerning the present invention is explained using a drawing.

  As shown in FIGS. 1 and 2, the pipe end sealing plug 1 supplies water and air to various pipes such as a water pipe and a drain pipe of a building, for example, and checks whether or not there is a leak. This is for sealing pipe ends connected to various facilities such as faucets when water leakage inspection is performed on pipes. A seal portion 3 and a grip portion 4 are formed on the outer periphery of the rubber ring 2, and the rubber ring 2 and the pair of narrow pressure members 5 and 6 are integrated with each other via a bolt 7 and a wing nut 8.

  This tube end sealing plug 1 is inserted into the tube end portion 9 so that the grip portion 4 is positioned on the back side of the seal portion 3, and then the wing nut 8 is tightened to tighten the rubber ring with the narrow pressure members 5, 6. 2 is narrowed in the direction of the flow path, the rubber ring 2 is expanded in the radial direction, the seal portion 3 is tightly adhered to the inner surface of the tube end portion 9 and the grip portion 4 is attached to the inner surface of the tube end portion 9. A frictional force that resists pulling out is obtained by contact, and the fluid is prevented from flowing out from the tube end portion 9 to be sealed.

  The rubber ring 2 has an outer diameter that is slightly smaller than the inner diameter of the tube end 9, a ring shape having a substantially triangular cross section with the inner edge side at the apex and the outer edge side at the bottom, and the center hole at the narrow pressure member 5. 6 is occluded. The tapered surfaces 10 and 11 on the back side and the near side of the rubber ring 2 are pressed in the flow path direction by the narrow pressure members 5 and 6, thereby receiving a component force acting in the radial direction and compressing in the flow path direction. As a result, the rubber ring 2 expands in the radial direction.

  The seal portion 3 is a ridge that is substantially semicircular in cross section and continuous in the circumferential direction of the rubber ring 2, and its top portion is in close contact with the inner surface of the tube end portion 9, thereby obtaining a frictional force that resists withdrawal. The tube end 9 is sealed by sealing between the inner surface of the tube.

  The grip portion 4 has a substantially rectangular cross section and is formed in a gear shape formed by alternately arranging protrusions 12 that contact the inner surface of the tube end portion 9 and fluid passages 13 that allow fluid in the tube to pass therethrough in the circumferential direction. It is formed at a distance from the seal portion 3 in the flow path direction when viewed from the side. The grip 4 is set to a size such that the protruding portion 12 protrudes radially outward from the seal portion 3, and the top portion is pressed against the inner surface of the pipe end portion 9, thereby releasing the fluid pressure from the fluid passage 13. Meanwhile, a frictional force is obtained between the inner surface of the tube and resistance to slipping out from the tube end portion 9.

  The narrow pressure members 5 and 6 are formed in, for example, a metal disk shape having bolt holes 14 and 15 in the center, and are integrated by a bolt 7 and a wing nut 8 with the rubber ring 2 interposed therebetween. By tightening 8, tapered surfaces 10 and 11 of the rubber ring 2 are pressed by tapered portions 16 and 17 that are continuous in the circumferential direction.

  The narrow pressure member 5 on the back side is slightly smaller in diameter than the inner diameter of the tube end portion 9, and a tapered portion 16 is formed on the peripheral edge portion thereof. The narrow pressure member 6 on the near side is set to an outer diameter that is substantially the same as the outer diameter of the tube end portion 9, and a flange portion 18 that abuts the end surface of the tube end portion 9 is formed at the peripheral edge thereof, and the inner side thereof The taper part 17 is formed in this. In the figure, reference numerals 19 and 20 denote washers, and reference numeral 21 denotes a rotation preventing portion for the narrow pressure member 5 of the bolt 7.

  According to the above configuration, as shown in FIG. 3, the tube end sealing plug 1 is configured by integrating the narrow pressure members 5 and 6 while interposing the rubber ring 2 using the bolt 7 and the wing nut 8. After the insertion into the tube end 9, the rubber ring 2 can be squeezed by the narrow pressure members 5, 6 to expand in the radial direction by tightening the wing nut 8. As a result, the seal portion 3 is brought into intimate contact with the inner surface of the tube end portion 9 to be sealed, and the grip portion 4 is brought into pressure contact with the inner surface of the tube end portion 9 to obtain a frictional force that resists pulling out. Resisting the pressure 22, the fluid can be prevented from flowing out from the tube end 9 and sealed.

  Further, as shown in FIG. 4, the grip portion 4 is disposed on the back side with respect to the seal portion 3, so that the pipe end sealing plug 1 is pushed and moved by the fluid pressure 22, and the seal portion 3 is pushed out from the pipe end. Even if this occurs, the grip portion 4 remaining on the tube end portion 9 can resist the tube end sealing plug 1 from being pulled out. In addition, after the seal portion 3 is pushed out from the pipe end, the fluid pressure 22 can be released from the fluid passage 13 of the grip portion 4 to prevent subsequent movement, thereby preventing the pipe end sealing plug 1 from popping out. can do.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, instead of forming the protrusions 12 and the fluid passages 13 alternately and forming a gear shape, the grip portion can also be formed as a fluid passage by forming a hole inside the outer peripheral edge. In order to narrow the rubber ring 2, instead of tightening the wing nut 8, a lever for narrowing the space between the narrow pressure members 5, 6 may be provided. Further, the rubber ring 2 may be pushed and spread directly by applying a force in the radial direction without being narrowed in the flow path direction. Further, instead of providing the rubber ring 2 having the seal portion 3 and the grip portion 4, the seal portion and the grip portion may be formed separately.

DESCRIPTION OF SYMBOLS 1 Pipe end sealing plug 2 Rubber ring 3 Seal part 4 Grip part 5, 6 Narrow member 7 Bolt 8 Wing nut 9 Pipe end 10, 11 Tapered surface 12 Projection part 13 Fluid passage 14, 15 Bolt hole 16, 17 Taper Part 18 collar part 19, 20 washer 21 detent part 22 fluid pressure

Claims (3)

  A pipe end sealing plug that is inserted into the pipe end portion to prevent outflow of fluid, and includes a seal portion that tightly seals against the inner surface of the tube and a grip portion that contacts the inner surface of the tube and obtains a frictional force. The pipe end sealing plug is characterized in that the grip portion has a fluid passage through which fluid passes, and is disposed on the back side of the seal portion in the flow path direction when viewed from the pipe end side.   The pipe according to claim 1, further comprising: a rubber ring having the seal part and a grip part; and a pair of narrow pressure members that squeeze the rubber ring in a flow path direction to expand the rubber ring in a radial direction. End sealing plug.   The grip portion is formed in a gear shape in which the outer peripheral portion is alternately arranged in the circumferential direction with protrusions that contact the inner surface of the pipe, and the protrusions are radially outer than the seal portion. The tube end sealing plug according to claim 1, wherein the tube end sealing plug is set to a size protruding into the tube end.

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