JP2013053700A - Pipe joint and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing a slip between a part to be grasped and a body, and grasping and fixing the part to be grasped not to move and rotate in such a configuration that the part to be grasped separately manufactured from the body is installed on the outer periphery of the body.SOLUTION: The pipe joint 1 includes a cylindrical body 2 and the part 3 to be grasped attached to the outer periphery of the cylindrical body 2. A groove 3a is formed at the inner periphery of the part 3 to be grasped in the longitudinal direction of the cylindrical body 2. A part (entry portion 2a) of the outer peripheral surface of the cylindrical body 2 enters the groove 3a of the inner periphery of the part 3 to be grasped.

Description

  The present invention relates to a pipe joint and a manufacturing method thereof.

  A pipe joint for connecting a tubular member to a connected member such as another tubular member is usually a cylindrical main body portion through which fluid or the like can flow, and an outer periphery of the main body portion. And a gripped portion to be gripped when connecting to the connected member. In general, the outer peripheral portion of the gripped portion has a polygonal shape (for example, a hexagonal shape) that is easily gripped by a spanner or the like. And when attaching this pipe joint to a tubular member or a to-be-connected member, in order to fix and prevent a pipe joint from moving and rotating, a to-be-held part is hold | gripped with a spanner etc. Thereby, the pipe joint can be attached with high accuracy. Patent Document 1 discloses a configuration in which a hexagonal nut-shaped gripped portion (large-diameter portion) is integrally formed with a cylindrical main body portion.

JP 2010-255775 A

  As for the pipe joint in which the main body portion and the gripped portion are integrated as in the configuration described in Patent Document 1, the manufacturing process is complicated. Further, when manufacturing this pipe joint by cutting one steel material, there are many materials that are removed by cutting and are wasted, and the manufacturing cost is high.

  On the other hand, a gripped portion manufactured separately from the main body may be attached to the outer periphery of the main body. In this case, the inner peripheral surface of the gripped portion is an annular shape that is in close contact with the outer peripheral surface of the main body portion. If slip occurs between the gripped portion of the pipe joint and the main body, the pipe joint cannot be fixed so as not to move and rotate using the gripped portion, and the fitting accuracy of the pipe joint deteriorates. .

  There is also a pipe joint having a configuration in which the gripped portion is a nut having a female screw and is attached to the main body portion by being screwed into a male screw formed on the outer peripheral surface of the main body portion. In such a configuration, if a force is applied to rotate the gripped portion relative to the main body, the gripped portion rotates relative to the main body while tightening or loosening the screw. The joint cannot be fixed so as not to move and rotate, and the mounting accuracy deteriorates.

  Therefore, an object of the present invention is to provide a pipe joint that can be fixed so that the gripped portion is gripped and not moved and rotated by a configuration in which a gripped portion manufactured separately from the main body portion is attached to the outer periphery of the main body portion. It is to provide.

  A feature of the present invention is that, in a pipe joint including a cylindrical main body portion and a gripped portion attached to the outer periphery of the main body portion, a groove along the longitudinal direction of the main body portion is provided in the inner peripheral portion of the gripped portion. In other words, a part of the outer peripheral surface of the main body part is in the groove in the inner peripheral part of the gripped part.

  Another feature of the present invention is that in a method of manufacturing a pipe joint including a cylindrical main body portion and a gripped portion attached to the outer periphery of the main body portion, the inner periphery of the gripped portion has a length of the main body portion. A part of the outer peripheral surface of the main body is gripped by enlarging the main body in the radial direction from the inside in a state where a groove along the direction is formed and the gripped part is fitted on the outer periphery of the main body. It is in the place where it can enter in the groove | channel of the inner peripheral part.

  According to the present invention, the slip between the gripped portion and the main body portion can be suppressed, and the gripped portion can be gripped and fixed so that the pipe joint does not move and rotate. As a result, the pipe joint can be easily connected to the tubular member or the connected member with high accuracy.

(A) is the front view of the pipe joint of the 1st Embodiment of this invention, (b) is the sectional drawing. It is a principal part expanded sectional view of the pipe joint shown in FIG. FIG. 1B is a side sectional view of the pipe joint shown in FIG. 1, and FIG. (A)-(c) is a partially notched front view which shows the manufacturing process of the pipe joint shown in FIG. 1 in order. It is a front view of the pipe joint of the 2nd Embodiment of this invention. (A) is a front view of the pipe joint of the 3rd Embodiment of this invention, (b) is a front view which shows the state which connected the pipe joint to the tubular member and the to-be-connected member.

  Embodiments of the present invention will be described below with reference to the drawings. A front view of the pipe joint 1 of the first embodiment of the present invention is shown in FIG. 1 (a), and a cross-sectional view thereof is shown in FIG. 1 (b). FIG. 2 is an enlarged cross-sectional view of the main part of the pipe joint 1. FIG. 3A is a side sectional view of the pipe joint 1 and FIG. 3B is an enlarged sectional view of a main part thereof.

  The pipe joint 1 has one cylindrical main body 2 and one gripped portion 3 fitted on the outer periphery of the main body 2. The inner peripheral portion of the gripped portion 3 has a shape in which a groove 3 a along the longitudinal direction of the main body portion 2 is formed in a part (preferably a plurality of locations) of an annular shape that is in close contact with the outer peripheral surface of the main body portion 2. . The outer periphery of the gripped portion 3 has a polygonal shape (in the illustrated example, a hexagonal shape). Then, a part of the main body 2 is enlarged in the radial direction, and a part of the outer peripheral surface (the entry part 2a shown in FIG. 3) enters the groove 3a in the inner peripheral part of the gripped part 3. It is out. In the present embodiment, the diameter is changed in accordance with members (tubular members or connected members) connected to both sides of the main body 2, and the left side in FIG. 1 is formed to have a larger diameter than the right side. Yes.

  According to this configuration, even if a force to rotate the gripped portion 3 attached to the outer periphery of the main body 2 with respect to the main body 2 is applied, as shown in FIG. Since the entry part 2a of the main body 2 that has entered the circumferential groove 3a cannot escape from the groove 3a, the gripped part 3 is prevented from rotating. Further, even if a force is applied to move the gripped portion 3 along the longitudinal direction of the main body portion 2 with respect to the main body portion 2, the entry portion 2a cannot escape from the groove 3a. As shown in 1 (b) and 2, since the gripped portion 3 bites into the outer peripheral surface of the main body portion 2, movement of the gripped portion 3 is prevented. That is, since the entry portion 2a of the main body 2 cannot escape in the circumferential direction from the groove 3a of the grasped portion 3, rotation of the grasped portion 3 is prevented, and the entry portion 2a extends from the groove 3a in the longitudinal direction of the main body portion 2. Since it cannot escape and the to-be-held part 3 bites into the outer periphery of the main-body part 2, the movement of the to-be-held part 3 is prevented. Even if a force is applied in an oblique direction between the circumferential direction and the longitudinal direction, the gripped portion 3 is prevented from rotating and moving in the same manner. Therefore, although not shown, when the gripped portion 3 of the pipe joint 1 is gripped by a jig such as a spanner when the pipe joint 1 is connected to a tubular member or a connected member, the gripped portion 3 and the main body portion 2 The pipe joint 1 can be firmly fixed without causing any rotation or movement. Thereby, the pipe joint 1 can be accurately connected to the tubular member or the connected member.

  The manufacturing method of this pipe joint 1 is demonstrated. First, the main body 2 and the gripped portion 3 shown in FIG. 4A are separately formed and prepared. The main body 2 is a cylindrical steel material with no irregularities formed on the outer peripheral surface. As shown in FIGS. 1 to 3, the gripped portion has a configuration in which the outer peripheral portion has a polygonal shape (in the example, a hexagonal shape), and the inner peripheral portion has an annular shape with grooves 3 a partially formed. The number of the grooves 3a is not particularly limited, but the plurality of grooves 3a are preferably formed so as to be positioned along the longitudinal direction of the main body 2 after assembly.

  From the state shown in FIG. 4A, processing for expanding the diameter of one side portion (left side in FIG. 1) of the main body portion 2 is performed by a known method. This is to cope with a difference in diameter between a member connected to one side of the main body and a connecting portion of a member connected to the other side (right side in FIG. 1). Then, as shown in FIG. 4 (b), the gripped part 3 manufactured separately is fitted into the main body part 2. At this point, the gripped portion 3 may be movable or rotatable with respect to the main body portion 2, and there is a slight gap between the inner peripheral surface of the gripped portion 3 and the outer peripheral surface of the main body portion. It may be.

  Next, as shown in FIG. 4C, the punch 4 is inserted into the cylindrical main body 2 from one end of the main body 2 to which the gripped portion 3 is attached. The punch 4 is made of a metal material harder than the main body 2, and at least a part of the outer diameter is larger than the inner diameter of the main body 2. Accordingly, when the punch 4 is moved from one end side to the other end side of the main body 2, the punch 4 further expands the main body 2 in the radial direction from the inside. That is, the main body 2 is expanded radially from the inside to the punch 4 in the radial direction and is uniformly enlarged over the entire circumference. When the punch 4 reaches the location of the main body 2 where the gripped portion 3 is attached, the main body 2 is restrained by the inner peripheral surface of the gripped portion 3, so that the inner periphery of the gripped portion 3 is It cannot be expanded beyond touching the surface. However, at a position facing the groove 3a on the inner peripheral portion of the gripped portion 3, the main body portion 2 partially expands in the radial direction and enters the groove 3a. Then, when the punch 4 is further moved, the main body portion 2 is uniformly expanded in the radial direction over the entire circumference in portions other than the gripped portion 3. When the punch 4 is moved by a predetermined distance, the punch 4 is taken out from the main body 2. Thus, the pipe joint 1 shown in FIG. 1 is completed.

  Thus, as a result of inserting and moving the punch 4 having an outer diameter larger than the inner diameter of the main body 2 into the main body 2, a part of the main body 2 is expanded in the radial direction. And in the part to which the to-be-gripped part 3 of the main-body part 2 is attached, it is restrained by the inner peripheral surface of the to-be-gripped part 3, and expansion is controlled, but a part of outer peripheral surface of the main-body part 2 is to be grasped It is an entry portion 2 a that enters the groove 3 a on the inner periphery of the portion 3. That is, at the place where the gripped portion 3 is attached, an uneven shape is formed on the outer periphery of the main body portion 2 by the entrance portion 2a and other portions as viewed in the circumferential direction. Thereby, as described above, the rotation of the gripped portion 3 with respect to the main body portion 2 is suppressed.

  Further, the gripped portion 3 bites into the outer peripheral surface of the main body portion 2, and steps are formed at both ends of the gripped portion 3 when viewed in the longitudinal direction of the main body portion 2. This step is caused by the difference in the amount of enlargement in the radial direction between the portion of the main body 2 that is in contact with and restrained against the gripped portion 3 and the portion that is not in contact with and restrained against the gripped portion 3. ing. By this step, movement of the gripped portion 3 in the longitudinal direction of the main body 2 is also suppressed.

  If the groove is formed in the outer peripheral portion of the main body portion, not the inner peripheral portion of the gripped portion, the effect of preventing the gripped portion from rotating and moving is insufficient if the groove is simply formed. It is necessary to reduce the diameter of a part of the inner peripheral surface of the gripping part and enter the groove in the outer peripheral part of the main body part. In that case, unless a material is shrunk by applying a force to tighten the gripped portion from the outside to the inside, the inner peripheral surface of the gripped portion hardly enters the groove. Thus, it is not easy to shrink the gripped portion evenly, and the rotation and movement of the gripped portion with respect to the main body cannot be suppressed very effectively.

  On the other hand, in the present invention, the groove 3a is formed on the inner peripheral surface of the gripped portion 3, and the main body portion 2 is pushed outward in the radial direction so as to enter the groove 3a. It can be easily implemented. Furthermore, when the punch 4 made of a material harder than the main body portion 2 is used, the entry portion 2a can enter the groove 3a extremely easily and reliably. Therefore, the rotation of the gripped portion 3 with respect to the main body portion 2 can be effectively suppressed. In addition, it is possible to easily suppress the movement of the gripped portion 3 relative to the main body 2 by adopting a configuration in which the gripped portion 3 bites into the outer peripheral surface of the main body 2.

  FIG. 5 shows a pipe joint 1 according to a second embodiment of the present invention. This pipe joint 1 is subjected to cutting for facilitating connection to a tubular member or a member to be connected to both ends of the main body part 2 of the pipe joint 1 shown in FIG. This is a configuration in which another gripped portion 5 is attached to the side opposite to 3. The inner peripheral portion of the gripped portion 5 is, like the inner peripheral portion of the gripped portion 3, a part of an annular shape that is in close contact with the outer peripheral surface of the main body portion 2 (preferably at a plurality of locations). It is the shape in which the groove | channel 5a along a direction was formed. And the outer peripheral part of the to-be-held part 5 is a ring-shaped part for connecting with the polygonal part (hexagonal shape in the example shown in the figure) and the tubular member etc. which are mentioned later similarly to the outer peripheral part of the to-be-held part 3. It has a portion 5b. This ring-shaped portion 5b may be formed with a male screw.

  Attachment of the gripped portion 5 to the main body is performed in the same manner as the mounting of the gripped portion 3 described above. That is, in a state where the gripped portion 5 is fitted on the outer periphery of the main body portion 2, the gripped portion 5 is expanded from the inside in the radial direction using the punch 4 (see FIG. 4C), whereby the main body portion 2. A part of the outer peripheral surface (entrance 2a) enters the groove 5a. Thereby, the gripped portion 5 is fixed so as not to rotate or move with respect to the main body portion 2.

  FIG. 6 shows a pipe joint 1 according to a third embodiment of the present invention. The pipe joint 1 is a so-called elbow in which the main body 2 of the pipe joint 1 according to the second embodiment shown in FIG. 5 is bent by 90 degrees. Since the configuration and attachment method of the gripped portions 3 and 5 are the same as those in the first and second embodiments, the description thereof is omitted. In the present embodiment, the main body 2 is bent by a known method after the gripped portions 3 and 5 are attached as in the second embodiment shown in FIG.

  The use state of this pipe joint 1 is shown in FIG. The male thread provided at one end of the main body 2 is screwed into, for example, the female thread of the fluid circulation port 6 (connected member) of the semiconductor manufacturing apparatus, whereby the pipe joint 1 is connected to the fluid circulation port 6. ing. This screwing is performed in a state where the gripped portion 3 is gripped by a spanner or the like (not shown). According to the present embodiment, since the member to be grasped 3 does not rotate with respect to the main body 2, connection by secure screwing can be performed.

  In addition, the nut 9 is connected to the ring of the gripped portion 5 through the sleeve 8 disposed on the outer periphery of the tubular member 7 in a state where the tubular member 7 made of resin, for example, is fitted into the other end portion of the main body portion 2. The tubular member 7 is connected to the other end of the main body 2 by being screwed into the male screw of the shaped portion 5b. The resin tubular member 7 is pressed against the sleeve 8 from the inner peripheral side by a protrusion provided at the other end of the main body 2. The sleeve 8 is pressed from the outside in the radial direction by the nut 9 and spreads outward in the radial direction on both sides of the portion pressed by the nut 9. With this configuration, the tubular member 7 is not detached from the pipe joint 1 and high sealing performance is obtained. The gripped portion 5 is gripped by a spanner or the like (not shown) so that the main body portion 2 does not rotate together when the nut 9 is screwed.

  In this way, the elbow-shaped pipe joint 1 connects the tubular member 7 and the fluid circulation port 6 of the semiconductor manufacturing apparatus which is a connected member. For example, when one end of the main body 2 is connected to a member to be connected (fluid flow port 6) and when the other end is connected to the tubular member 7, a gripped object is located near each end. When the parts 3 and 5 are gripped by a jig such as a spanner, the gripped parts 3 and 5 and the main body part 2 can be firmly fixed. In this state, an operation for connecting both ends of the pipe joint 1 to the connected member (fluid flow port 6) and the tubular member 7 is performed. According to the present invention, since the gripped portions 3 and 5 are all prevented from rotating or moving with respect to the main body portion 2, they can be connected with high accuracy.

  However, only one of the two gripped portions 3 and 5 is configured to have a groove on the inner periphery as described above, and the other is a main body portion by another method (for example, integral formation or screwing of a male screw and a female screw). The structure attached to 2 may be sufficient.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Main-body part 2a Approach part 3 Grasped part 3a Groove 4 Punch 5 Grasped part 5a Groove 5b Ring-shaped part 6 Fluid flow port (connected member) of semiconductor manufacturing apparatus
7 Tubular member 8 Sleeve 9 Nut

Claims (8)

In a pipe joint including a cylindrical main body part and a gripped part attached to the outer periphery of the main body part,
A groove along the longitudinal direction of the main body is provided in the inner peripheral part of the gripped part,
A part of the outer peripheral surface of the main body portion enters the groove in the inner peripheral portion of the gripped portion.   The inner peripheral part of the gripped part has a shape in which the groove is formed in a part of an annular shape that is in close contact with the outer peripheral surface of the main body part, and the outer peripheral part of the gripped part has a polygonal shape. Item 1. The pipe joint according to Item 1.   The pipe joint according to claim 2, wherein the outer peripheral portion of the gripped portion has a hexagonal shape. In a method of manufacturing a pipe joint including a cylindrical main body portion and a gripped portion attached to the outer periphery of the main body portion,
A groove along the longitudinal direction of the main body is formed in the inner peripheral part of the gripped part,
In a state where the gripped portion is fitted on the outer periphery of the main body portion, the main body portion is radially expanded from the inside, so that a part of the outer peripheral surface of the main body portion of the inner peripheral portion of the gripped portion is A method of manufacturing a pipe joint, wherein the pipe fitting is inserted into the groove.   The pipe joint according to claim 4, wherein expanding the main body portion in the radial direction from the inside is performed by inserting a punch having an outer diameter of at least a portion larger than an inner diameter of the main body portion into the main body portion. Manufacturing method.   The method for manufacturing a pipe joint according to claim 5, wherein the punch is made of a metal harder than the main body.   The inner peripheral part of the gripped part has a shape in which the groove is formed in a part of an annular shape that is in close contact with the outer peripheral surface of the main body part, and the outer peripheral part of the gripped part has a polygonal shape. Item 7. The method for manufacturing a pipe joint according to any one of Items 4 to 6.   The method for manufacturing a pipe joint according to claim 7, wherein the outer peripheral portion of the gripped portion has a hexagonal shape.

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