Closure device for pipe end

Abstract

To simplify a structure of a closure device for a pipe end.SOLUTION: A closure device for a pipe end that closes an end of a pipe in which a male screw portion is provided on an outer peripheral portion of a longitudinal end portion comprises: a pressing member having a small-diameter portion insertable into an inner peripheral portion of the end of the pipe and a large-diameter portion having an outer diameter larger than an outer diameter of the small-diameter portion; a seal member having a ring shape and mountable on an outer peripheral portion of the small-diameter portion; and a cap having a female screw portion that is screwed to the male screw portion, and also having a pressing portion that contacts the large-diameter portion and is capable of pressing the seal member against an end surface of the end of the pipe.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a piping end closure device for closing the end of a pipe. [Background technology]

[0002] For example, an injection device with an injection nozzle attached to the end of a pipe requires a pressure test of the pipe because a high-pressure injection fluid is supplied inside the device. The pressure test of the pipe is performed by attaching a pressure cap to the end of the pipe to close it, and then supplying high-pressure gas into the inside of the pipe to pressurize it. In this case, the pressure cap is connected to the end of the pipe by a threaded portion formed at the end, which poses a problem that the high-pressure gas inside is likely to leak from the threaded portion. One solution to this problem is described, for example, in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-95689 Summary of the Invention [Problem to be solved by the invention]

[0004] The pipe end cap described in Patent Document 1 has a first sealing body attached to the inside of the end of the pipe via an O-ring, and a second sealing body attached to the outside of the end of the pipe via an O-ring. In this case, it is necessary to attach the O-ring to the sealing body beforehand, and two sealing bodies are required, which creates a problem of a complicated structure.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a closure device for a pipe end that simplifies the structure. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the presently disclosed piping end closing device is a piping end closing device that closes the end of a pipe that has a male thread portion provided on the outer periphery of the longitudinal end, and includes a pressing member that has a small diameter portion that can be inserted into the inner periphery of the end of the pipe and a large diameter portion whose outer diameter is larger than the outer diameter of the small diameter portion, a ring-shaped sealing member that can be attached to the outer periphery of the small diameter portion, and a cap that has a female thread portion that screws into the male thread portion and a pressing portion that contacts the large diameter portion and can press the sealing member against the end face of the end of the pipe. [Effects of the Invention]

[0007] According to the piping end closing device of the present disclosure, the structure can be simplified. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a piping end closing device of this embodiment. [Figure 2] FIG. 2 is a perspective view showing the pressing member and the sealing member. [Figure 3] FIG. 3 is a schematic diagram showing a method for closing a pipe end using a pipe end closing device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0010] <Closing device for piping end> FIG. 1 is a cross-sectional view showing a piping end closing device of this embodiment.

[0011] As shown in Fig. 1, the pipe 100 is a cylindrical pipe centered on an axis O. The pipe 100 has a male thread portion 101 provided on the outer periphery of the end portion in the longitudinal direction. The pipe end closing device 10 closes the end portion of the pipe 100 configured in this manner.

[0012] The piping end closing device 10 has a pressing member 11, a sealing member 12, and a cap 13. The piping end closing device 10 can be attached to the end of a pipe 100. When the piping end closing device 10 is attached to the end of the pipe 100, the centers of the pressing member 11, the sealing member 12, and the cap 13 are positioned so as to coincide with the center (axis O) of the pipe 100.

[0013] <Pressing member> FIG. 2 is a perspective view showing the pressing member and the sealing member.

[0014] 1 and 2, pressing member 11 has small diameter portion 21 and large diameter portion 22. Pressing member 11 is made of a metal material such as carbon steel or stainless steel. In this case, piping 100 is also made of a metal material such as carbon steel or stainless steel, and it is preferable that piping 100 and pressing member 11 are made of the same material.

[0015] Small diameter portion 21 has an outer diameter D1, and large diameter portion 22 has an outer diameter D2, with the outer diameter D1 being smaller than the outer diameter D2. Small diameter portion 21 is insertable into inner periphery 102 at the end of piping 100. Specifically, it is preferable that outer diameter D1 of small diameter portion 21 is the same as or slightly smaller than inner diameter D0 of piping 100, so that small diameter portion 21 can fit snugly into inner periphery 102 at the end of piping 100. However, it is also possible that outer diameter D1 of small diameter portion 21 is smaller than inner diameter D0 of piping 100, so that small diameter portion 21 can be inserted into inner periphery 102 at the end of piping 100 with a gap. Furthermore, it is preferable that the axial length of small diameter portion 21 is longer than the axial length of large diameter portion 22.

[0016] <Sealing material> 1 and 2, the sealing member 12 is ring-shaped. The sealing member 12 can be attached to the outer periphery of the small diameter portion 21 of the pressing member 11. The sealing member 12 is made of a resin material such as fluororesin. However, the sealing member 12 is not limited to a resin material, and may be made of any elastically deformable material, such as a rubber material (polymer compound).

[0017] The seal member 12 has an inner diameter D11 and an outer diameter D12. The inner diameter D11 of the seal member 12 is preferably the same as or slightly larger than the outer diameter D1 of the small diameter portion 21 of the pressing member 11, and the seal member 12 can fit snugly around the outer periphery of the small diameter portion 21 of the pressing member 11. The outer diameter D12 of the seal member 12 is larger than the inner diameter D0 of the pipe 100 and is the same as the outer diameter D2 of the large diameter portion 22 of the pressing member 11. However, the outer diameter D12 of the seal member 12 may be slightly larger or smaller than the outer diameter D2 of the large diameter portion 22.

[0018] <Cap> As shown in FIG. 1, the cap 13 has a cylindrical portion 31, a female thread portion 32, and a pressing portion 33. The piping 100, the pressing member 11, and the cap 13 are made of the same material (metal). The inner diameter of the cylindrical portion 31 is approximately the same as the outer diameter of the piping 100. The female thread portion 32 is provided on the inner periphery of one axial end (the right end in FIG. 1) of the cylindrical portion 31. The female thread portion 32 can be threaded onto the male thread portion 101 of the piping 100. The pressing portion 33 is provided integrally with the other axial end (the left end in FIG. 1) of the cylindrical portion 31. That is, the cylindrical portion 31 is opened by providing the female thread portion 32 at one axial end, and is closed by providing the pressing portion 33 integrally with the other axial end.

[0019] The pressing portion 33 has a pressing surface 33a that is perpendicular to the axis O. The pressing portion 33 is disposed opposite the pressing member 11 (sealing member 12) that is attached to the end of the piping 100. The pressing portion 33 comes into contact with the back surface 22a of the large diameter portion 22 of the pressing member 11 and presses along the axis O, thereby pressing the sealing member 12 against the end surface 103 of the end of the piping 100.

[0020] <How to close the end of the pipe> FIG. 3 is a schematic diagram showing a method for closing a pipe end using a pipe end closing device.

[0021] As shown in Figures 1 and 3, first, sealing member 12 is attached to pressing member 11. Sealing member 12 is attached to small diameter portion 21 of pressing member 11. Next, pressing member 11 with sealing member 12 attached is attached to the end of piping 100. Small diameter portion 21 of pressing member 11 fits into inner periphery 102 of the end of piping 100. At this time, sealing member 12 attached to pressing member 11 preferably contacts end face 103 of the end of piping 100.

[0022] Finally, the cap 13 is attached to the end of the pipe 100. The female thread portion 32 of the cap 13 is aligned with the male thread portion 101 of the end of the pipe 100, and the cap 13 is rotated to screw the female thread portion 32 into the male thread portion 101 of the pipe 100. As the cap 13 rotates, the female thread portion 32 screws into the male thread portion 101, and the cap 13 moves in one direction (to the right in FIG. 1 ) along the axis O. At this time, the pressing surface 33a of the pressing portion 33 of the cap 13 comes into contact with the back surface 22a of the large diameter portion 22 of the pressing member 11 and presses it in the same direction. Therefore, the pressing member 11 presses the sealing member 12 against the end surface 103 of the end of the pipe 100. As a result, the sealing member 12 is compressed, tightly adhering to the end surface 103 of the pipe 100, and the end of the pipe 100 is closed.

[0023] Once the end of the pipe 100 is closed by the pipe end closing device 10, a pressure test of the pipe 100 can be performed by supplying a pressure test gas (e.g., an inert gas such as nitrogen) from the opposite end of the pipe 100.

[0024] [Effects of this embodiment] The first aspect of the piping end closing device is a piping end closing device 10 that closes the end of a pipe 100 that has a male thread portion 101 provided on the outer periphery of the longitudinal end, and is equipped with a pressing member 11 that has a small diameter portion 21 that can be inserted into the inner periphery 102 of the end of the pipe 100 and a large diameter portion 22 whose outer diameter is larger than the outer diameter of the small diameter portion 21, a ring-shaped sealing member 12 that can be attached to the outer periphery of the small diameter portion 21, and a cap 13 that has a female thread portion 32 that screws into the male thread portion 101 and a pressing portion 33 that comes into contact with the large diameter portion 22 and can press the sealing member 12 against the end face 103 of the end of the pipe 100.

[0025] According to the nuclear reactor of the first aspect, after pressing member 11 with sealing member 12 attached thereto is inserted into inner periphery 102 of the end of pipe 100, simply by attaching cap 13 to the end of pipe 100, sealing member 12 is pressed against end face 103 of pipe 100, thereby closing the end of pipe 100. This allows for a simplified structure.

[0026] Furthermore, the sealing member 12 is attached to the holding member 11 in advance and then attached to the end of the pipe 100 together with the holding member 11, improving assembly ease. In this case, the sealing member 12 can be more appropriately assembled than in conventional devices in which a sealing member is attached to a cap. Furthermore, when the pipe end closing device 10 is used repeatedly, only the deteriorating sealing member 12 needs to be replaced, so the holding member 11 and cap 13 can be used for a long period of time, and the replacement of the sealing member 12 can be easily performed.

[0027] The piping end closing device according to the second aspect is the piping end closing device according to the first aspect, and furthermore, the outer diameter of the seal member 12 is larger than the inner diameter of the pipe 100. This allows the seal member 12 to be properly adhered to the end face 103 of the pipe 100.

[0028] The piping end closing device according to the third aspect is the piping end closing device according to the first or second aspect, and furthermore, the outer diameter of the sealing member 12 is the same as the outer diameter of the large diameter portion 22. This allows the pressing member 11 to press the sealing member 12 appropriately, thereby improving sealing performance.

[0029] A piping end closing device according to a fourth aspect is the piping end closing device according to any one of the first to third aspects, and further includes a pressing member 11 made of a metal material and a sealing member 12 made of a resin material. This allows the hard pressing member 11 to apply a pressing force to the soft sealing member 12, thereby improving sealing performance.

[0030] The piping end closing device according to the fifth aspect is the piping end closing device according to either the first or fourth aspect, and further, the piping 100, the pressing member 11, and the cap 13 are made of the same material. This makes it possible to prevent corrosion of the piping 100, the pressing member 11, and the cap 13 due to contact with different materials.

[0031] In the above-described embodiment, the piping end closing device 10 has been described as being applied to the piping 100 of an injection device, but it can also be applied to any piping provided with a male thread portion 101 at the end. [Explanation of symbols]

[0032] 10 Closing device for pipe ends 11 Pressing member 12 Sealing material 13 Cap 21 Small diameter section 22 Large diameter section 22a back 31 Cylindrical part 32 Female thread 33 Pressing section 33a Pressing surface 100 Piping 101 Male thread 102 Inner circumference 103 End Face

Claims

1. A piping end closing device for closing an end of a pipe having a male thread portion provided on the outer periphery of the longitudinal end, a pressing member having a small diameter portion that can be inserted into the inner periphery of the end portion of the pipe and a large diameter portion whose outer diameter is larger than the outer diameter of the small diameter portion; a ring-shaped seal member that can be attached to the outer periphery of the small diameter portion; a cap having a female thread portion that screws into the male thread portion and a pressing portion that contacts the large diameter portion and is capable of pressing the seal member against the end surface of the end of the pipe; A piping end closing device comprising:

2. The sealing member has an outer diameter larger than the inner diameter of the pipe.

2. A piping end closure device according to claim 1.

3. The outer diameter of the sealing member is the same as the outer diameter of the large diameter portion. A piping end closing device according to claim 1 or 2.

4. The pressing member is made of a metal material, and the sealing member is made of a resin material.

2. A piping end closure device according to claim 1.

5. The piping, the pressing member, and the cap are made of the same material.

2. A piping end closure device according to claim 1.

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