JP5059504B2 - Pipe joint structure with flange - Google Patents

Description

  The present invention relates to a flanged pipe joint structure.

  A structure in which a flange is joined to a pipe is widely used in automobiles, industrial machines, home appliances, and the like, and is used in many parts.

  Conventionally, in a pipe joining structure for liquid, gas, etc., for example, after a flange is welded to the tip of the pipe, the flanges are fastened with bolts or the like.

  Patent Document 1 discloses a flange joint structure of an existing pipe line.

Patent Document 2 discloses a flange joint structure at a discharge port of a submersible pump.
Japanese Patent Laid-Open No. 10-238676 JP 2003-97843 A

  However, in the conventional method, since the pipe and the flange are joined by welding or the like, strength reduction during heating, rust prevention power reduction due to surface treatment destruction, or the like is caused.

  In order to overcome the decrease in strength and rust resistance, it is necessary to add heat treatment, post-processing surface treatment, addition of airtight leakage test, careful selection of materials, etc., which increase the manufacturing cost.

  An object of the present invention is to provide a flanged pipe joint structure having a highly reliable seal structure, for example, a highly reliable seal structure with respect to airtightness, durability, and rust prevention.

  Examples of the solving means of the present invention are as follows.

(1) It has a pipe body, a first flange part integrally formed with the pipe body in the outer peripheral direction of the pipe body, and a second flange part provided on the first flange part. have a cushion means, the cushion means is a cushion allowance, cushion allowance are formed to have a hollow bending the pipe body, the cushion allowance are provided on the outer periphery of the first flange portion, a second flange The flanged pipe joint structure characterized in that the portion has a crimped portion, and the crimped portion presses the cushion means of the first flange portion to form a sealed state .

(2) The flanged pipe joint structure described above , wherein the cushioning means of the first flange portion is pressed by the second flange portion and a mating object to form a sealed state .

  ADVANTAGE OF THE INVENTION According to this invention, the highly reliable seal structure, for example, the flanged pipe joint structure which has airtightness, durability, and rust prevention property can be provided. In particular, in the present invention, it is easy to stabilize the seal pressure between the first flange portion and the second flange portion by the cushion means.

  Further, since the cushion means can absorb the vibration of the entire structure, noise caused by the vibration can be reduced.

  Moreover, since no heat is generated by welding, the energy cost is low, the material is not thermally deteriorated, and the strength of the material can be maintained. In particular, when the pipe joint structure is used in the oil path, the oil can ensure airtightness at the joint portion, and air suction can be completely prevented.

  When the cushion means is formed as a cushion allowance, if the cushion allowance is formed by bending the pipe body so that it has a hollow, the hollow portion performs a better cushioning function and reduces the number of components and manufacturing costs. Can be reduced. For example, it is easy to achieve a desired cushion effect by pressing the cushion margin with the burring formed on the second flange portion.

  When the cushion margin is provided on the outer peripheral portion of the first flange portion, the cushion margin is more likely to come into contact with the second flange portion at the outer peripheral portion, and it is easier to obtain a better sealing state.

  When the cushion means is a seal packing provided on at least one surface of the first flange portion, complete rigid joining can be achieved particularly when gas tightness is important.

  When the second flange portion has a crimping portion and the crimping portion presses the cushion means of the first flange portion to obtain a sealed state, the crimping force by the crimping portion can be adjusted by the size of the bending portion. It is also possible to increase the caulking power.

  The flanged pipe joint structure according to the best mode of the present invention includes a pipe main body, a first flange portion integrally formed with the pipe main body in the outer circumferential direction of the pipe main body, and a second flange provided on the first flange portion. And the first flange portion has cushion means. For example, the cushion means can be configured as a cushion margin, and the cushion margin can be formed integrally with the first flange portion. Alternatively, the cushion means can be configured as a seal packing, and the seal packing can be formed separately from the first flange portion.

  Preferably, the cushion means is a cushion allowance, and the pipe body is bent so that the cushion allowance is hollow. The term “hollow” includes the meaning of an open space having various shapes in addition to a closed space having a closed periphery.

  Preferably, a cushion margin is provided on the outer peripheral portion of the first flange portion.

  Preferably, the second flange portion has a crimped portion, and the crimped portion presses the cushion means of the first flange portion to form a sealed state.

  Preferably, the cushion means is a seal packing provided on at least one surface of the first flange portion.

  Preferably, the cushion means of the first flange portion is pressed by the second flange portion and the mating object to make a sealed state. In this case, it is preferable to press the second flange portion and the counterpart by fixing them with bolts. In many cases, the counterpart is a flange or a wall.

  A first embodiment of the present invention will be described below with reference to FIG.

  FIG. 1 shows a partial cross section of a flanged pipe joint structure in Embodiment 1 of the present invention.

  The flanged pipe joint structure 10 includes a pipe body 12, a first flange portion 14, and a second flange portion 16.

  The first flange portion 14 is integrally formed with the pipe body 12 in the outer peripheral direction near the lower end of the pipe body 12. The 1st flange part 14 has the cushion margin 18 in the outer peripheral direction. The cushion allowance 18 swells at least in the axial direction of the pipe body 12 and is formed by bending the pipe body 12 so as to have a hollow 18a inside.

  The second flange portion 16 is provided so as to surround the vicinity of the lower end of the pipe body 12. The pipe body 12, the first flange portion 14, and the second flange portion 16 have a common axis X1.

  The second flange portion 16 has a recess 16a that is opened inward in the radial direction. The recess 16a is surrounded by a first portion 16b and a caulking portion 16d that are spaced apart in the direction of the axis X1 and a second portion 16c on the back side therebetween. The cushion margin 18 is located in the recess 16a. That is, the cushion margin 18 is located between the first portion 16b, the second portion 16c, and the crimping portion 16d.

  In the example shown in FIG. 1, the caulking portion 16d is formed in a raised state in advance, and the cushion margin 18 of the pipe body 12 is placed there (not shown). Then, the sealing state is achieved by bending the crimping portion 16d and pressing the cushion margin 18. The sealed state can be achieved by pressing the cushion allowance 18 against the caulking portion 16d of the second flange portion 16 and the second portion 16c on the back side. In addition, a higher sealing effect can be achieved by further pressing the caulking portion 16d from the state of FIG.

  With reference to FIGS. 2-4, an example of the process of shape | molding a pipe joint structure by a crimping part is demonstrated.

  FIG. 2 shows an example of a blank for the second flange portion in Embodiment 2 of the present invention. FIG. 3 shows an example of the processed state of the blank of FIG. FIG. 4 shows an example in which preliminary caulking is performed with the members of FIG. 2 to 4, members corresponding to those in FIG. 1 are denoted by reference numerals added with 10 and description thereof is omitted.

  When the pipe joint structure 20 is formed, first, an annular blank 26e for the second flange portion 26 is prepared (FIG. 2).

  The inner peripheral portion of the annular blank 26e is subjected to burring to form a first portion 26b projecting inward, a caulking portion 26d raised upward, and a second portion 26c therebetween (see FIG. 3).

  The cushion margin 28 of the first flange portion 24 of the pipe body 22 is placed on the first portion 26b, and the cushion margin 28 is pressed by the caulking portion 26d. FIG. 4 shows an example of a process in the middle of pressing. The cushion margin 28 is pressed by the caulking portion 26b and comes into contact with the first portion 26b, the second portion 26c, and the caulking portion 26d of the second flange portion 26, so that a good sealing state can be achieved.

  FIG. 5 shows a partial cross section of a flanged pipe joint structure in Embodiment 3 of the present invention. FIG. 5 is a modification of the portion indicated by A in FIG. In addition, among the members in FIG. 5, members corresponding to those in FIG.

  The second flange portion 36 has a recess 36a that is opened inward in the radial direction. The recess 36a is surrounded by a first portion 36b and a caulking portion 36d that are spaced apart in the axial direction of the pipe main body 32, and a second portion 36c on the back side therebetween. The cushion allowance 38 is located in the recess 36a. That is, the cushion margin 38 is located between the first portion 36b, the second portion 36c, and the crimping portion 36d.

  In the example shown in FIG. 5, the second portion 36 c of the second flange portion 36 is recessed outward in the radial direction. A radially outer portion of the cushion margin 38 is in contact with the second portion 36c. A good sealing state can be achieved by the cushion allowance 38 coming into contact with the second flange portion 36 in a larger area.

  FIG. 6 shows a partial cross section of a flanged pipe joint structure in Embodiment 4 of the present invention.

  The flanged pipe joint structure 40 includes a pipe body 42, a first flange portion 44, and a second flange portion 46. A counterpart 49 is located below the second flange portion 46 in the figure.

  The first flange portion 44 is formed integrally with the pipe body 42 in the outer peripheral direction of the lower end of the pipe body 42.

  The first flange portion 44 has a cushion margin 48 in the outer peripheral direction. The cushion margin 48 swells at least in the axial direction of the pipe body 42. The cushion allowance 48 is formed by bending the pipe body 42 so as to have a hollow 48a inside.

  The second flange portion 46 is provided so as to surround the lower end of the pipe body 42. The pipe body 42, the first flange portion 44, and the second flange portion 46 have a common axis X1.

  The second flange portion 46 has a recess 46a that is open downward in the drawing and radially inward. The recess 46 a is surrounded by the first portion 46 b of the second flange portion 46, the second portion 46 c farther from this, and the counterpart 49. The cushion margin 48 is located between the first portion 46 b and the second portion 46 c of the second flange portion 46 and the counterpart 49.

  In the example shown in FIG. 6, the second flange portion 46 and the counterpart 49 are fixed with bolts along an axis X2 parallel to the axis X1 of the pipe body 42. The cushion state 48 is pressed by the second flange portion 46 and the counterpart 49 to achieve a sealed state.

  FIG. 7 shows a partial cross section of a flanged pipe joint structure in Example 5 of the present invention. In addition, among the members in FIG. 7, members corresponding to those in FIG.

  The second flange portion 56 has a recess 56a that is opened inward in the radial direction. The recess 56a is surrounded by a first portion 56b and a caulking portion 56d that are spaced apart from each other in the axial direction of the pipe body 52, and a second portion 56c on the back side therebetween.

  In the example shown in FIG. 7, a seal packing 58 is provided on one surface of the first flange portion 54 of the pipe body 52. The caulking portion 56 d presses the first flange portion 54, thereby pressing the seal packing 58 toward the first portion 56 b of the second flange portion 56. When the seal packing 58 is pressed between the first flange portion 54 and the first portion 56b of the second flange portion 56, complete rigid joining can be achieved in the case of considering airtightness such as gas.

  The invention is not limited to the illustrated embodiment. The cushion means can employ various shapes other than the illustrated shapes.

The partial cross section of the pipe joint structure with a flange in Example 1 of this invention is shown. An example of the blank for 2nd flange parts in Example 2 of the present invention is shown. An example of the state which processed the blank of FIG. 2 is shown. The example which performs preliminary crimping with the member of FIG. 3 is shown. The partial cross section of the pipe joint structure with a flange in Example 3 of this invention is shown. The partial cross section of the pipe joint structure with a flange in Example 4 of this invention is shown. The partial cross section of the pipe joint structure with a flange in Example 5 of this invention is shown.

Explanation of symbols

10, 20, 30, 40, 50 Flange pipe joint structure 12, 22, 32, 42, 52 Pipe body 14, 24, 34, 44, 54 First flange portion 16, 26, 36, 46, 56 Second flange Part 16a, 26a, 46a, 56a depression 16b, 26b, 36b, 46b, 56b first part 16c, 26c, 36c, 46c, 56c second part 16d, 26d, 36d, 56d caulking part 26e blank 18, 28, 38, 48 Cushion allowance 49 Counterpart 58 Seal packing X1, X2 Shaft center

Claims (2)

A pipe body, a first flange portion integrally formed with the pipe body in an outer peripheral direction of the pipe body, and a second flange portion provided on the first flange portion, wherein the first flange portion serves as a cushion means. Yes, and the cushion means Ri cushion Daidea, cushion allowance are formed to have a hollow bending the pipe body, the cushion allowance are provided on the outer periphery of the first flange portion, the second flange portion A flanged pipe joint structure having a caulking portion, wherein the caulking portion presses the cushion means of the first flange portion into a sealed state.   2. The flanged pipe joint structure according to claim 1, wherein the cushion means of the first flange portion is pressed by the second flange portion and a mating object to form a sealed state.

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