JP3015865U - Pipe joint seal structure - Google Patents

Abstract

(57) [Abstract] [Purpose] A seal structure for pipe joints that prevents rusting and corrosion of the pipe end of the pipe body by stabilizing and ensuring the seal between the pipe body and the fittings into which it is inserted. provide. [Structure] A sealing means 1 is provided between a joint tool 4 and a tubular body 5 inserted therein. The sealing means 1 is formed by integrally forming the flange portion 6 and the reduced diameter portion 7, and commercially available O-rings 11 and 12 are fitted to both of them. The O-ring 11 is pressed against the inner surface of the fitting 4, and the O-ring 12 is pressed against the inner surface of the inserted tubular body 5. Even if there is some variation in the insertion position of the tubular body 5, the tubular body 5 and the O-ring 12 abut and engage with each other. The double O-rings 11 and 12 described above completely prevent the water from flowing around the pipe end 5a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is provided at a connecting portion between a fitting and a pipe provided in a pipe portion of a flexible tube or a connecting portion between the fitting and each pipe that is installed at a connecting portion between the pipes. The present invention relates to a pipe joint seal structure suitable for preventing rusting and corrosion of the end surface of a pipe.

[0002]

[Prior art]

 Between the fitting provided at the end of the flexible tube and the pipe connected to it, or between the fitting and each pipe installed at the joint between the pipes, the pipe end of the pipe is Conventionally, a sealing means has been used to prevent rusting or corrosion of the pipe body caused by contact with water. There are various sealing means, each of which has its own characteristics.

[0003]

[Problems to be solved by the device]

 The pipes and fittings themselves consist of those whose inner and outer surfaces are rust-proofed and which use anti-rust materials. However, when the pipe body is connected to the fitting, the pipe body is cut and used each time. Therefore, the bare skin that is not rustproofed is exposed on the end surface of the pipe. Therefore, if the water passing through the pipe wraps around the end face of the pipe and comes into contact with it, rust is easily generated, which causes a problem that rust is mixed into the used water. Therefore, as described above, the sealing means is employed to prevent water from flowing around the end surface of the pipe body. On the other hand, the connection between the fitting and the pipe is done at the construction site, so it is likely to occur when the pipe is not completely inserted. Therefore, there is a need for a pipe joint seal structure having a structure in which there is no problem even if there is some inconvenience in inserting the pipe body, and the connection between the pipe body and the fitting is quick and easy. However, none of the conventional techniques sufficiently satisfies these.

The present invention has been made in view of the above circumstances, and it is possible to reliably seal the fitting and the pipe body and to completely prevent rusting and corrosion of the end surface of the pipe body. Moreover, it is an object of the present invention to provide a seal structure for a pipe joint which is easy to assemble.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a seal having a sealing member which is interposed between a pipe inserted into and fixed to a fitting and the fitting to seal the two. In the structure, the sealing means comprises a core made of synthetic resin, and the core is integrally connected to the flange portion through a stepped surface and a flange portion that can be inserted into the inner surface of the joint tool. A pipe having a reduced diameter portion and a through hole, and an O-ring which is in pressure contact with the inner surface of the fitting on the outer periphery of the flange portion, and is inserted into the reduced diameter portion on the outer periphery of the reduced diameter portion. This structure constitutes a seal structure of a pipe joint in which an O-ring that is pressed against the inner surface of the body is fitted. Further, the sealing means includes the core and a ring-shaped packing member made of a rubber-like member or a synthetic resin material fitted in the reduced diameter portion of the core.

[0006]

[Action]

 Each member necessary for connecting to the fitting is inserted into the outer peripheral side of the pipe body, and the core is fitted into the pipe end side of the pipe body. Since the O-ring fitted in the reduced diameter portion is pressed against the inner surface of the tube body, the tube body and the tube end are sealed. Next, the tubular body is inserted into the fitting. The O-ring fitted to the flange of the core presses against the inner surface of the fitting. This seals the inside of the fitting and the pipe ends of the pipe. As a result, water does not get around the pipe end and rusting and corrosion are prevented. On the other hand, by inserting the packing member into the core, the sealing property of the pipe end can be further improved.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an axial cross-sectional view showing the structure of the fitting and the pipe body to which this embodiment is applied, FIG. 2 is a drawing showing an embodiment of the core of the sealing means, and FIG. 3 is the other sealing means of the present invention. FIG. 7 is an axial cross-sectional view showing a joint tool provided with the embodiment of FIG.

As shown in FIG. 1, the sealing means 1 of this embodiment comprises a core 2. The core 2 is interposed between the fitting 4 and the tubular body 5 inserted therein, and seals the two. The joint tool 4 has a stepped portion 19 inside, a taper portion 20 is formed on the opening end side, and a screw portion 21 is threaded on the outer periphery on the opening end side. A connection cap nut 22 is screwed onto the threaded portion 21 of the joint tool 4. A packing 23 is provided between the tapered portion 20 of the joint tool 4 and the outer periphery of the inserted tube body 5 and press-contacts them. A washer 24 and a tapered lock ring 25 are provided between the connecting cap nut 22 and the outer periphery of the pipe body 5. By tightening the connecting cap nut 22 into the fitting 4, the packing 23, the washer 24, and the lock ring 25 are pressed against each other in the axial direction, and the packing 23 and the lock ring 25 are moved in the radial direction, so that the tubular body 5 Hold the perimeter. Due to the above, the pipe body 5 is fixed to the joint tool 4 side.

As shown in FIGS. 1 and 2A and 2B, the core 2 is reduced in diameter through the flange portion 6 and the step surface 13 and extends from the flange portion 6 along the axial direction. It is formed of a hollow body having a reduced diameter portion 7 and a through hole 8 penetrating the both, and in this embodiment, it is made of a synthetic resin material and formed by molding. A concave groove 9 is provided on the outer circumference of the flange portion 6, and a commercially available O-ring 11 is fitted therein. On the other hand, a concave groove 10 is provided in the outer periphery of the reduced diameter portion 7 at a substantially intermediate portion in the axial direction thereof, and a commercially available O-ring 12 is fitted in the concave groove 10. The outer diameter of the O-ring 11 is such that the core 2 is pressed against the inner surface of the fitting 4 when the core 2 is mounted in the fitting 4. Further, the outer diameter of the O-ring 12 is such that it has an outer diameter that comes into pressure contact with the inner surface of the tubular body 5 when the tubular body 5 is inserted. The side end surface 14 is formed parallel to the stepped surface 13.

Next, a method of mounting the sealing means 1 will be described. First, the O-rings 11 and 12 are fitted to the core 2. The connecting cap nut 22 is put on the outer periphery of the tubular body 5 cut to a desired axial length, and then the lock ring 25, the washer 24, and the packing 23 are sequentially inserted. Next, the core 2 fitted with the O-rings 11 and 12 is fitted to the tube end 5a of the tube body 5. The O-ring 12 is inserted from the pipe end 5a side into the fitting 4 until the side end surface 14 of the flange portion 6 of the core 4 is brought into contact with the stepped portion 19 of the fitting 4. The O-ring 11 fitted to the flange portion 6 is pressed against the inner surface of the joint tool 4 to be sealed. As described above, water does not wrap around the tube end 5a side of the tube body 5. As shown in FIG. 1, a minute gap may be formed between the tube end 5a of the tube body 5 and the stepped surface 13 of the flange portion 6 of the core 2. If the fitting 4 is connected to the end of the flexible tube, this fine gap is adjusted so that it will be eliminated, but if the fitting 4 is installed between the pipes, tighten the pipe on the other hand side. There is a possibility that this minute gap may further expand due to the inclusion. However, since the minute gap does not extend to the position where the O-ring 12 protrudes from the pipe body 5, sealing performance is secured.

FIG. 3 shows another embodiment of the present invention. This sealing means comprises a core 2 and a packing member 3. The core 2 is the same as that of the above-mentioned embodiment, and the O-ring 11 and the O-ring 12 are fitted to the flange portion 6 and the reduced diameter portion 7 thereof. The packing member 3 is made of a soft material such as a rubber-like member or a synthetic resin material, and is fitted or bonded to the reduced diameter portion 7 and fixed to the core 2 side. The outer circumference 18 has substantially the same size as the inner diameter of the outer diameter fitting 4, and the inner diameter of the inner hole 17 is substantially equal to the outer diameter of the reduced diameter portion 7 of the core 2. Moreover, both end surfaces 15 and 16 are formed orthogonal to the axial direction. In this case, the tube end 5 a of the tube body 5 inserted into the joint tool 4 can come into contact with the side end surface 15 of the packing member 3. Therefore, even if there is some variation in the insertion position of the tube end 5a, the tube end 5a is pressed against the packing member 3. That is, in the case of the present embodiment, the O-rings 11 and 12 and the packing member 3 provide a more complete seal between the tubular body 5 and the fitting 4. By the above, rusting and corrosion of the pipe end 5a are prevented.

In the above description, only one O-ring 11 and O-ring 12 may be provided in each of the flange portion 6 and the reduced diameter portion 7 of the core, or it may be provided in a plurality of rows.

[0013]

[Effect of device]

 According to the present invention, the following remarkable effects are obtained. 1) By adopting a structure in which a double O-ring is used for sealing, the sealing between the pipe body and the fitting is reliably performed. 2) Since water in the pipe and fittings does not get around to the pipe end side, rusting and corrosion of the pipe end are prevented. 3) A safer seal can be achieved by using a sealing means composed of a packing member fitted to the core. 4) O-rings and packing members are easily available and can be implemented easily and inexpensively.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view showing the structure around a fitting provided with an embodiment of the sealing means of the present invention.

2A and 2B are drawings showing a core of a sealing means of the present embodiment, FIG. 2A is a plan view thereof, and FIG. 2B is a sectional view taken along line AA of FIG.

FIG. 3 is an axial cross-sectional view showing the structure around a fitting provided with another embodiment of the sealing means of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing means 1a Sealing means 2 Core 3 Packing member 4 Joint tool 5 Tubular body 5a Tube end 6 Flange section 7 Reduced diameter section 8 Through hole 9 Recessed groove 10 Recessed groove 11 O-ring 12 O-ring 13 Stepped surface 14 Side end surface 15 Side end face 16 Side end face 17 Inner hole 18 Outer periphery 19 Stepped portion 20 Tapered portion 21 Screw portion 22 Connection cap nut 23 Packing 24 Washer 25 Lock ring

Claims (2)

[Scope of utility model registration request] 1. A seal structure having a sealing member that is interposed between a pipe body inserted into and fixed to a fitting and the fitting and that seals between the two, the sealing means comprising: The core is made of a synthetic resin and has a flange portion that can be inserted into the inner surface of the fitting, a reduced diameter portion that is integrally connected to the flange portion through a stepped surface, and a through hole. And an O-ring that press-contacts the inner surface of the fitting on the outer periphery of the flange portion, and an O-ring that press-contacts the inner surface of the tubular body inserted into the reduced-diameter portion on the outer periphery of the reduced-diameter portion. A seal structure for pipe joints, which is characterized by comprising 2. The pipe joint according to claim 1, wherein the sealing means has the core and a ring-shaped packing member made of a synthetic resin material or a rubber-like member fitted to the reduced diameter portion of the core. Seal structure.