Cylindrical member and cylindrical assembly

Abstract

To provide a cylindrical member that can stably flow a high-temperature fluid over a long period even when connected to a pipe body. 【Solution means】The cylindrical member 10 includes a main body cylindrical portion 12 having a circular cross-section with a first diameter d1, and a diameter-expanded cylindrical portion 14 having a circular cross-section that is continuous with the main body cylindrical portion 12 and has a second diameter d2 that is slightly larger than the first diameter d1 at an end opposite to the main body cylindrical portion 12. The diameter-expanded cylindrical portion 14 may have a tapered portion 14a that gradually changes from the first diameter d1 of the main body cylindrical portion 12 to the second diameter d2. The diameter-expanded cylindrical portion 14 may have a plurality of slits 14c of a predetermined length starting from an end having the second diameter d2.

Description

Technical Field

[0001] The present invention relates to a cylindrical member, and more particularly to a cylindrical member connected to a cylindrical pipe. The present invention also relates to a cylindrical assembly using the cylindrical member.

Background Art

[0002] In order to connect two cylindrical pipes, a cylindrical connecting member is used. For example, Patent Document 1 discloses a cylindrical joint that can be inserted into and connected to each end of two pipe bodies.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, resin parts are used in the joint described in Patent Document 1, and when a high-temperature fluid is circulated through the pipe body, the resin parts rapidly deteriorate due to heat. Therefore, it has been difficult to apply the joint to a high-temperature fluid.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a cylindrical member that can stably flow a high-temperature fluid for a long period even when connected to a pipe body. Another object is to provide a cylindrical assembly that can stably flow a high-temperature fluid for a long period.

Means for Solving the Problems

[0006] (1) The cylindrical member according to the present invention includes a main body cylindrical portion having a circular cross-section with a first diameter, Continuously provided with respect to the main body cylindrical portion is a diameter-expanded cylindrical portion having a circular cross-section and having a second diameter slightly larger than the first diameter at an end portion on the side opposite to the main body cylindrical portion.

[0007] According to this cylindrical member, even when connected to a pipe to be connected, it is possible to stably flow a high-temperature fluid over a long period of time.

[0008] (2) In the above-described cylindrical member, the diameter-expanded cylindrical portion may have a tapered portion that gradually changes from the first diameter of the main body cylindrical portion to the second diameter.

[0009] According to this cylindrical member, when a pipe to be connected is connected, the resistance of the fluid can be reduced, and the fluid can flow smoothly.

[0010] (3) In the above-described cylindrical member, the diameter-expanded cylindrical portion may have a plurality of slits having a predetermined length from an end portion having the second diameter.

[0011] According to this cylindrical member, even when the outer diameter of the pipe and the inner diameter of the diameter-expanded cylindrical portion are close to each other, the diameter-expanded cylindrical portion expands when the pipe is inserted, and the pipe can be easily connected. Further, even when the diameter-expanded cylindrical portion expands while a high-temperature fluid is flowing, the expansion can be suppressed by the slits, so that a gap is less likely to occur between the pipe to be connected and the diameter-expanded cylindrical portion, and the fluid is less likely to leak.

[0012] (4) The cylindrical assembly according to the present invention includes the cylindrical member of (1) to (3) above, and a cylindrical insertion member having a cross-section with the first diameter and inserted into the diameter-expanded cylindrical portion of the cylindrical member.

[0013] According to this cylindrical assembly, it is possible to stably flow a high-temperature fluid over a long period of time.

[0014] (5) In the above-described cylindrical assembly, the gap formed between the cylindrical member and the cylindrical insertion member may be filled with a silicon-based adhesive.

[0015] According to this cylindrical assembly, the occurrence of fluid leakage can be suppressed.

Effect of the Invention

[0016] According to the present invention, it is possible to provide a cylindrical member that can stably flow a high-temperature fluid for a long period even when connected to a pipe body.

[0017] In addition, it is possible to provide a cylindrical assembly that can stably flow a high-temperature fluid for a long period.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0019] The cylindrical member according to the embodiment of the present invention will be described below with reference to the drawings.

[0020] FIG. 1 is a front view of the cylindrical member according to the present embodiment. FIG. 2 is a side view of the cylindrical member according to the present embodiment. FIG. 3 is a perspective view of the cylindrical member according to the present embodiment.

[0021] The cylindrical member 10 according to this embodiment includes a main body cylindrical portion 12 that extends in the axial direction as shown in FIG. 1 and has a circular cross-section with a first diameter d1, and a diameter-expanded cylindrical portion 14 that is continuous with the main body cylindrical portion 12 and has a circular cross-section with a second diameter d2 that is slightly larger than the first diameter d1 at an end opposite to the main body cylindrical portion 12.

[0022] The cylindrical member 10 may be made of a metal tube such as a stainless steel tube, a steel tube, or a copper tube as long as it has heat resistance. The thickness of the cylindrical member 10 is not particularly limited and can be, for example, 0.4 mm, 0.5 mm, 1.0 mm, etc. Also, the axial length of the cylindrical member 10 is not particularly limited and can be, for example, 75 mm.

[0023] The outer diameter (first diameter d1) of the main body cylindrical portion 12 is not particularly limited and can be, for example, 50 mm, 65 mm, 75 mm, 100 mm, 125 mm, etc. The axial length of the main body cylindrical portion 12 is not particularly limited and can be, for example, 15 mm. Also, for example, when the outer diameter of the cylindrical member 10 is 50 mm, 65 mm, or 75 mm, the thickness of the cylindrical member 10 can be 0.4 mm or 1.0 mm, and when the outer diameter of the cylindrical member 10 is 100 mm or 125 mm, the thickness of the cylindrical member 10 can be 0.5 mm or 1.0 mm.

[0024] The cylindrical member 10 according to this embodiment has diameter-expanded cylindrical portions 14 at both ends, one at each axial end of the main body cylindrical portion 12. The axial length of the main body cylindrical portion 12 is not particularly limited and can be, for example, 30 mm.

[0025] Each diameter-expanded cylindrical portion 14 has a tapered portion 14a provided on the main body cylindrical portion 12 side and a constant-diameter portion 14b provided on the side opposite to the main body cylindrical portion 12.

[0026] The tapered portion 14a gradually transitions in a tapered shape from the first diameter d1 to the second diameter d2 of the main body cylindrical portion 12. That is, the outer diameter of the tapered portion 14a is the first diameter d1 at the end on the side of the main body cylindrical portion 12, gradually widens as it moves away from the main body cylindrical portion 12, and is the second diameter d2 at the end on the side opposite to the main body cylindrical portion 12. The axial length of the tapered portion 14a is not particularly limited and can be, for example, 15 mm. The longer the tapered portion 14a is, the more the flow resistance of the fluid flowing through the tapered portion 14a can be reduced.

[0027] The outer diameter of the constant-diameter portion 14b is constant at the second diameter d2. The second diameter d2 is slightly larger than the first diameter d1, specifically, it can be 0.5% - 1.5% larger than the value obtained by adding twice the thickness of the constant-diameter portion 14b to the first diameter d1. For example, when the first diameter d1 is 75 mm and the thickness of the constant-diameter portion 14b is 0.4 mm, the second diameter d2 can be 76.2 mm - 76.9 mm.

[0028] The inner diameter of the constant-diameter portion 14b is smaller than the outer diameter by the thickness. That is, the inner diameter of the constant-diameter portion 14b can be 0.5% - 1.5% larger than the value obtained by subtracting twice the thickness of the constant-diameter portion 14b from the first diameter d1.

[0029] The enlarged-diameter cylindrical portion 14 of the cylindrical member 10 according to the present embodiment has a plurality of slits 14c of a predetermined length starting from the end having the second diameter d2. Specifically, as shown in FIGS. 2 and 3, the enlarged-diameter cylindrical portion 14 has four slits 14c at 90° intervals around the axis of the cylindrical member 10. The number of slits 14c is not limited to four and may be two or three, or may be five or more as long as the strength of the enlarged-diameter cylindrical portion 14 can be maintained.

[0030] Also, as shown in FIGS. 1 to 3, the slits 14c extend from the end on the side opposite to the main body cylindrical portion 12 toward the main body cylindrical portion 12 in the axial direction of the enlarged-diameter cylindrical portion 14.

[0031] The dimensions of the slit 14c may be determined according to the thickness of the pipe body connected by the cylindrical member 10, and for example, the length may be 12 mm and the width may be 0.5 mm. The opening end of the slit 14c may be rounded as shown in FIGS. 1 and 3.

[0032] The manufacturing method of the cylindrical member 10 is as follows.

[0033] First, prepare a pipe material of a predetermined length. Next, insert a diameter-expanding tool from both axial ends of the pipe material in a state where it is thinner than the inner diameter of the pipe material, and expand the diameter-expanding tool so that the outer diameters of both axial ends of the pipe material become the outer diameter of the sizing portion 14b and the outer diameter of the central portion of the pipe material does not change.

[0034] Thereby, a main body cylindrical portion 12 is formed in the central portion of the pipe material, sizing portions 14b are formed at both axial ends of the pipe material, and a tapered portion 14a is formed between the main body cylindrical portion 12 and the sizing portions 14b.

[0035] Furthermore, a slit 14c is formed from the end on the side opposite to the main body cylindrical portion 12 in the axial direction of the sizing portion 14b toward the main body cylindrical portion 12. Through the above steps, the cylindrical member 10 is completed.

[0036] The cylindrical assembly according to the present embodiment will be described.

[0037] FIG. 4 is a partial side view of the cylindrical assembly according to the present embodiment. The cylindrical assembly 1 includes the above-described cylindrical member 10 and two cylindrical insertion members 2 having a cross section with a first diameter d1 and inserted into the expanded diameter cylindrical portion 14 of the cylindrical member 10.

[0038] The cylindrical insertion member 2 is a pipe material having a circular cross-sectional shape, and the outer diameter is the same as the first diameter d1 of the cylindrical member 10. Also, the outer diameter of the cylindrical insertion member 2 is preferably smaller than the first diameter d1 of the cylindrical member 10 and has a dimension that can fit into the tapered portion 14a of the cylindrical member 10 and be fixed.

[0039] The cylindrical assembly 1 is completed by inserting the cylindrical insertion member 2 from the end of the sizing portion 14b of the enlarged-diameter cylindrical portion 14 of the cylindrical member 10. The enlarged-diameter cylindrical portion 14 expands at the slit 14c according to the outer diameter of the cylindrical insertion member 2.

[0040] <Modification Example> A modification example of the cylindrical member 10 and the cylindrical assembly 1 according to the present embodiment will be described.

[0041] FIG. 5 is a partial side view of a cylindrical assembly according to a modification example of the present embodiment. The cylindrical assembly 3 according to this modification example includes two cylindrical insertion members 2 and three cylindrical members (a first cylindrical member 20, a second cylindrical member 30, and a third cylindrical member 40).

[0042] The first cylindrical member 20 has a main body cylindrical portion 22 that is circular in cross-section and bent at 90°, and enlarged-diameter cylindrical portions 24 that are continuous with both ends of the main body cylindrical portion 22. The first cylindrical member 20 has two enlarged-diameter cylindrical portions 24.

[0043] The main body cylindrical portion 22 has a first diameter d1 at both ends. The enlarged-diameter cylindrical portion 24 has a tapered portion 24a, a sizing portion 24b, and a slit 24c. The enlarged-diameter cylindrical portion 24 has a tapered portion 24a, a sizing portion 24b, and a slit 24c, and has the same configuration as the tapered portion 14a, the sizing portion 14b, and the slit 14c of the enlarged-diameter cylindrical portion 14 in the above-described present embodiment, respectively.

[0044] The second cylindrical member 30 has a main body cylindrical portion 32 and an enlarged-diameter cylindrical portion 34 that is continuous with one end of the main body cylindrical portion 32. The second cylindrical member 30 has one enlarged-diameter cylindrical portion 34.

[0045] The second cylindrical member 30 has the same configuration as the cylindrical member 10 in the above-described present embodiment, except that the main body cylindrical portion 32 is longer than the main body cylindrical portion 12 and there is one enlarged-diameter cylindrical portion 34. The enlarged-diameter cylindrical portion 34 has a tapered portion 34a, a constant-diameter portion 34b, and a slit 34c, which have the same configurations as the tapered portion 14a, the constant-diameter portion 14b, and the slit 14c of the enlarged-diameter cylindrical portion 14, respectively.

[0046] The third cylindrical member 40 has a main body cylindrical portion 42 that is circular in cross-section and bent at 90°, and an enlarged-diameter cylindrical portion 44 that is continuous with one end of the main body cylindrical portion 42. The third cylindrical member 40 has one enlarged-diameter cylindrical portion 44.

[0047] The third cylindrical member 40 has the same configuration as the second cylindrical member 30, except that the enlarged-diameter cylindrical portion 44 is one while the second cylindrical member 30 has two enlarged-diameter cylindrical portions 24. The enlarged-diameter cylindrical portion 44 has a tapered portion 44a, a constant-diameter portion 44b, and a slit 44c, which have the same configurations as the tapered portion 14a, the constant-diameter portion 14b, and the slit 14c of the enlarged-diameter cylindrical portion 14, respectively.

[0048] In the cylindrical assembly 3 according to this modification, the cylindrical insertion member 2 is inserted into one enlarged-diameter cylindrical portion 24 of the first cylindrical member 20, and the end portion of the main body cylindrical portion 32 of the second cylindrical member 30 where the enlarged-diameter cylindrical portion 34 is not provided is inserted into the other enlarged-diameter cylindrical portion 24.

[0049] The end portion of the main body cylindrical portion 42 of the third cylindrical member 40 where the enlarged-diameter cylindrical portion 44 is not provided is inserted into the enlarged-diameter cylindrical portion 34 of the second cylindrical member 30.

[0050] Another cylindrical insertion member 2 is inserted into the enlarged-diameter cylindrical portion 44 of the third cylindrical member 40.

[0051] In this modification example, the cylindrical assembly 3 has been described with an example of a U shape. However, the cylindrical assembly can be configured to have various shapes by combining a cylindrical member having a diameter-expanded cylindrical portion on one end side, a cylindrical member having diameter-expanded cylindrical portions on both end sides, and a cylindrical member not having a diameter-expanded cylindrical portion.

[0052] In this embodiment and this modification example, the form of inserting and fixing the cylindrical insertion member from the end of the constant-diameter portion of the diameter-expanded cylindrical portion of one cylindrical member has been described. However, a ring-shaped fixture such as a hose band whose diameter can be expanded or reduced may be attached and fixed from the outside to the portion where the constant-diameter portion of the diameter-expanded cylindrical portion and the cylindrical insertion member overlap. By this fixture, the positive movement and disconnection of the pipe can be prevented. Further, the slit 14c may be hidden by arranging the fixture so as to cover the slit 14c. Furthermore, the gap between the cylindrical member 10 and the cylindrical insertion member 2 may be filled with a silicone-based adhesive to seal the gap.

Industrial Applicability

[0053] The present invention can be used for connecting metal pipes such as a plurality of thin-walled stainless steel pipes.

Explanation of Signs

[0054] 1 Cylindrical assembly 2 Cylindrical insertion member 10 Cylindrical member 12 Main body cylindrical portion 14 Diameter-expanded cylindrical portion 14a Taper portion 14c Slit 22 Main body cylindrical portion 24 Diameter-expanded cylindrical portion 24a Taper portion 24c Slit 32 Main body cylindrical portion 34 Diameter-expanded cylindrical portion 34a Taper portion 34c Slit 42 Main body cylindrical portion 44 Diameter-expanded cylindrical portion 44a Taper portion 44c slit d1 first diameter d2 second diameter

Claims

1. A cylindrical member comprising a main body cylindrical portion having a circular cross-section with a first diameter, and a diameter-expanded cylindrical portion that is continuous with the main body cylindrical portion and has a circular cross-section with a second diameter that is slightly larger than the first diameter at an end opposite to the main body cylindrical portion.

2. The cylindrical member according to claim 1, wherein the diameter-expanded cylindrical portion has a tapered portion that gradually changes from the first diameter of the main body cylindrical portion to the second diameter.

3. The cylindrical member according to claim 1, wherein the diameter-expanded cylindrical portion has a plurality of slits of a predetermined length starting from an end having the second diameter.

4. A cylindrical assembly including the cylindrical member according to any one of claims 1 to 3, and a cylindrical insertion member having a cross-section with the first diameter and inserted into the diameter-expanded cylindrical portion of the cylindrical member.

5. The cylindrical assembly according to claim 4, wherein a silicon-based adhesive is filled in a gap formed between the cylindrical member and the cylindrical insertion member.

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