JP2012042042A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing the insufficiency of fastening in insertion fitting between a female member and a male member.SOLUTION: The pipe joint 1 comprises the female member 10 and the male member 20 which is fit to the female member 10 by insertion and includes an intermediate member (seat metal 40) fixed to one side of the female member 10 and the male member 20 where the intermediate member abuts on the other side of the female member 10 and the male member 20 when the male member 20 is fit to the female member 10 by insertion up to a proper position.

Description

  The present invention relates to a pipe joint that connects pipes such as a hydraulic hose, equipment, and the like, and more particularly to a screw-type pipe joint.

  2. Description of the Related Art Conventionally, for example, in hydraulic equipment, a pipe joint including a passage for oil to flow is used to connect a pipe body such as a hydraulic hose and a hydraulic equipment such as a hydraulic pump to each other.

  For example, in Patent Document 1, a tube that connects a female outer sleeve and a male outer sleeve by screwing a nut provided on the outer side of a female outer sleeve to a thread surface formed on the outer side of a male outer sleeve. Joints are described. In this pipe joint, an inner pipe passage having a flow path formed in a side wall is provided in the male outer sleeve and the female outer sleeve, and sealing is achieved by connecting the female outer sleeve and the male outer sleeve. The inner pipe passages communicate with each other as the member moves in front of and behind the flow path.

  In the above example, the sealing member that sealed the outer wall of the inner tube passage on the front side of the flow path is directed toward the rear side of the flow path as the male outer sleeve is gradually screwed into the female outer sleeve. And move slowly. Then, when the male outer sleeve is screwed to an appropriate position with respect to the female outer sleeve, the seal member moves to the rear side of the flow path so that the seal member is not exposed in the communication path between the inner pipe paths. It has become.

JP-A-11-236990 (paragraphs 0005 to 0014)

  However, such a conventional pipe joint relies exclusively on the operator's sense of how the male sleeve is fastened to the female sleeve. Therefore, there is a possibility that the operator may finish the tightening (connection) operation even though the male outer sleeve is not tightened to the proper position with respect to the female outer sleeve. Distribution media (for example, oil) will leak. In addition, when such tightening is insufficient, the seal member may be exposed to the inside of the inner pipe passage, and the seal member may be damaged by the distribution medium flowing through the inside. there were.

  An object of this invention is to provide the pipe joint which can prevent insufficient tightening in insertion of a female type member and a male type member.

In order to solve such a problem, the pipe joint according to the present invention is a pipe joint comprising a female member and a male member inserted into the female member, the female member and the male member. An intermediate member fixed to one of the female member and the intermediate member when the male member is inserted to an appropriate position with respect to the female member. The other is contacted with the other.
The intermediate member includes a flat plate portion formed in a flat plate shape and an upright portion formed orthogonal to the flat plate portion.
In addition, the upright portion is disposed inside the outermost diameter of the female member in a side view.

  According to the present invention, the fact that the intermediate member is sandwiched between the female member and the male member serves as a mark indicating that the intermediate member has been inserted into an appropriate position, so that insufficient tightening can be prevented.

(A) It is sectional drawing in the state in which the pipe joint which concerns on one embodiment of this invention was isolate | separated. (B) It is sectional drawing in the state in which the pipe joint which concerns on one embodiment of this invention was connected. (A) It is a side view in the state where the pipe joint concerning one embodiment of the present invention was separated. (B) It is a side view in the state where the pipe joint concerning one embodiment of the present invention was connected. It is a side view in the state where the pipe joint concerning one embodiment of the present invention was connected. (A) It is a front view of the ring member in the pipe joint which concerns on one embodiment of this invention. (B) It is the side view. (C) It is the same top view.

  Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which show | plays the same effect, and the description is abbreviate | omitted. The present invention can be widely applied to screw-type pipe joints for flowing various fluids regardless of liquid or gas. Here, an example in which the present invention is applied to connection of piping such as hydraulic equipment. Will be described. Here, FIG. 1 to FIG. 3 show a female member and a male member. For convenience, the direction facing each other will be referred to as the front end, and the opposite side will be described as the rear end.

  FIG. 1A shows a cross-sectional view of the pipe joint 1 in a state where the female member 10 and the male member 20 are separated, and FIG. 2A shows a state where the female member 10 and the male member 20 are separated. Front views are shown respectively. As shown in FIG. 1A, the female member 10 includes an inner cylinder portion 11 in which an internal passage 10a for circulating oil as a distribution medium is formed, and the inner cylinder portion 11 supported on the distal end side. The rear end side includes a cylindrical connecting pipe portion 13 connected to an oil conduit (not shown), and a female cylindrical portion 15 provided on the outer periphery of the connecting pipe portion 13. A channel 11 a that communicates the inside and the outside is formed in the wall portion on the distal end side of the inner cylinder portion 11. When the female member 10 and the male member 20 are not in a connected state, the flow path 11a is blocked by a cylindrical movable valve 17 that is slidably provided on the outer periphery on the distal end side of the inner cylindrical portion 11. ing. At this time, since the movable valve 17 is always urged toward the distal end side by the coil spring 13 a disposed inside the connecting pipe portion 13, the distal end portion 17 a is at the distal end of the inner cylinder portion 11. It is in contact with the provided protrusion 11b. A seal member 17b (O-ring in the illustrated example) is provided on the inner peripheral surface on the distal end side of the movable valve 17, and the outer periphery on the distal end side from the flow path 11a in the inner cylinder portion 11 is sealed. Further, a seal member 13 b is also provided on the inner periphery on the distal end side of the connection pipe portion 13, and is sealed from the outer periphery of the movable valve 17. The inner peripheral surface 15 a on the distal end side of the female cylindrical portion 15, which is the distal end of the female mold member 10, is female threaded for connection with the male mold member 20.

  The male member 20 is connected to a cylindrical connecting pipe portion 23 whose rear end side is connected to an oil conduit (not shown), a male cylindrical portion 25 provided on the outer periphery of the leading end side of the connecting pipe portion 23, It comprises a movable valve 27 that is slidably arranged on the inner periphery of the male cylindrical portion 25 on the distal end side of the tube portion 23 and is urged by a coil spring 23 a disposed on the distal end side of the connection tube portion 23. . The wall portion of the movable valve 27 is provided with a flow path 27 a that communicates the inside and the outside. The flow path 27 a is provided at the tip of the movable valve 27 when not connected to the female member 10. The sealing member 27b and the rear end side of the step portion 25a provided on the front end side of the male cylindrical portion 25 are in contact with each other to be sealed. The connecting pipe portion 23 is inserted into the male cylindrical portion 25, and is sealed by the contact between the seal member 23b provided on the outer periphery on the distal end side and the inner periphery of the male cylindrical portion. Yes.

  As shown in FIG. 2A, the outer peripheral surface 25 b on the distal end side of the male cylindrical portion 25 is provided on the inner peripheral surface 15 a of the female cylindrical portion 15 for connection with the female mold member 10. The male thread corresponding to the female thread is cut. Further, as shown in FIG. 1A, a seal member 25 c is provided on the inner periphery on the distal end side from the step portion 25 a of the male cylindrical portion 25, and when the female member 10 is connected, the movable valve 17 is provided. It comes to adhere to the outer periphery of the. In addition, a nut-like portion 25d (formed in a hexagonal nut shape in the illustrated example) used when connecting the male member 20 and the female member 10 is integrally formed on the outer periphery of the male cylindrical portion 25. Is formed. Here, the rear end side of the nut-like portion 25d is a threaded bolt-like portion 25e, and the nut 30 is fitted therein. Further, an L-shaped washer 40 as an intermediate member is disposed between the nut 30 and the nut-like portion 25d, and is sandwiched between the nut 30 and the nut-like portion 25d. 1 and 2 are drawn so that the diagonal distance of the nut-like portion 25d is shown.

  As shown in FIGS. 4A to 4C, the washer 40 has a circular portion 41 formed in an annular flat plate shape with a part missing, and continuously outward at both ends of the circular portion 41. The flat plate portion 45 is formed by extending flat plate-like linear portions 43a and 43b, and is formed so as to be orthogonal to the flat plate portion 45 from the straight portions 43a and 43b of the flat plate portion 45 via the curved portions 44 and 44. It is comprised by the upright part 49 which consists of the raising parts 46a and 46b and the contact part 48 which connects these rising parts 46a and 46b linearly. The inner diameter of the circular portion 41 is slightly larger than the bolt-shaped portion 25e, and is less likely to wobble when fitted into the bolt-shaped portion 25e. Further, the linear portion 43a and the linear portion 43b are parallel in a plan view, and the inner distance 43L is a width 25L of one side surface of the nut-shaped portion 25d (in the case of a hexagonal nut shape as in the embodiment, It is half the diagonal distance (see FIG. 2). Here, when the washer 40 is fitted to the bolt-shaped portion 25e, the inner side surface of the upright portion 49 comes into contact with one side surface of the nut-shaped portion 25d (see FIG. 3). Since one side surface of the portion 25d fits between the rising portions 46a and 46b, the nut-like portion 25d and the bending portion 44 do not interfere with each other. And, the width 49H (height) from the flat plate portion 45 to the tip of the upright portion 49 is such that the male member 20 is inserted into the female member 10 to an appropriate position. The distance from the front end to the rear end face of the nut-like portion 25d is 20L.

  FIG. 1B is a cross-sectional view of the state in which the female member 10 and the male member 20 are joined, and FIG. 2B is a front view of the state in which the female member 10 and the male member 20 are joined. FIG. 3 shows side views of the state in which the female member 10 and the male member 20 are joined. As shown in FIG. 1 (b), with the male cylindrical portion 25 of the male member 20 fixed, the female cylindrical portion 15 of the female member 10 is inserted into the male cylindrical portion 25 while being screwed. As a result, the distal end of the movable valve 17 of the female member 10 comes into contact with the distal end side of the step portion 25a of the male tubular portion 25, the movable valve 17 is pressed to the rear end side, and the female member 10 The front end of the inner cylinder portion 11 and the movable valve 27 of the male member 20 come into contact with each other, and the movable valve 27 is pressed to the rear end side. When the distal end surface of the connecting tube portion 13 of the female member 10 and the distal end surface of the male cylindrical portion 25 are inserted and fitted to an appropriate position, the seal member 17b is connected to the flow path in the female member 10. When the movable valve 17 is moved so as to be positioned at the rear end side from 11a, the flow path 11a is opened, and in the male member 20, the movable valve 27 moves to the rear end side, and the seal member 27b is moved to the rear end side. By leaving the rear end side of the stepped portion 25a, the flow path 11a is opened, and the female member 10 and the male member 20 communicate with each other.

  Here, the height 49H of the washer 40 is the same as the distance 20L from the front end of the female cylindrical portion 15 to the rear end face of the nut-like portion 25d in the connected state, and therefore, the male member 20 with respect to the female member 10 is used. 2 is inserted into an appropriate position, the tip of the contact portion 48 of the washer 40 comes into contact with the tip of the female cylinder portion 15 as shown in FIGS. Thus, the operator can visually confirm that the male member 20 has been inserted to an appropriate position. Further, as shown in FIG. 3, the abutting portion 48 of the washer 40 is disposed on the inner side of the outermost diameter of the female member 10 (the outer diameter of the female cylindrical portion 15 in the illustrated example) in a side view. It is hard to receive the impact from the etc., and a deformation | transformation and damage by this do not arise easily.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. For example, the intermediate member is an L-shaped washer when viewed from the side, but the present invention is not limited thereto. If the intermediate member has a configuration that is sandwiched between the female member and the male member when the male member is inserted to an appropriate position with respect to the female member, the specific shape is limited. Is not to be done.

  Moreover, although the example in which the intermediate member is sandwiched between the rear end surface of the nut-like portion and the front end surface of the nut is shown, the present invention is not limited to this. For example, a nut may be fitted on the front end surface side of the nut-shaped portion, and may be sandwiched between the rear end surface of the nut and the front end surface of the nut-shaped portion. In this case, when the intermediate member is constituted by a washer, the height of the washer is formed to be the same as the distance from the distal end of the female cylindrical portion to the distal end surface of the nut-like portion in the connected state. is there. In addition, for example, the fixing method is not particularly limited, for example, the intermediate member is not clamped and fixed like a washer, but the male member is provided with a predetermined fitting portion to be fitted and fixed. is not. In the embodiment, since the intermediate member is sandwiched between the nut-like portion and the nut fitted adjacent thereto, the intermediate member can be easily attached and detached, and the female member has a different shape. Even in this case, handling becomes easy.

  Moreover, although the example in which the intermediate member is fixed to the male member has been shown, the present invention is not limited to this, and the intermediate member may be fixed to the female member. In this case, as described above, the fixing method is not particularly limited.

  Moreover, although the example which has only one contact part in the intermediate member was shown, it is not limited to this. When using a washer as an intermediate member and adjoining a hexagonal nut-shaped nut-like portion as in the embodiment, for example, the contact portions are arranged so as to be opposed to each other at two locations, or the contact portions are arranged at three locations as a plane. They can be shifted by 120 degrees in view.

  In addition, the specific configuration of the male member and the female member is merely an example, and if the pipe joint includes a female member and a male member inserted into the female member, the specific shape is It is not particularly limited.

1 Pipe Fitting 10 Female Member 20 Male Member 30 Nut 40 Washer (Intermediate Member)

Claims (3)

A pipe joint comprising a female member and a male member inserted into the female member,
An intermediate member fixed to one of the female member and the male member;
The intermediate member is brought into contact with the other of the female member and the male member when the male member is inserted to an appropriate position with respect to the female member. Pipe fittings.   The pipe joint according to claim 1, wherein the intermediate member includes a flat plate portion formed in a flat plate shape and an upright portion formed orthogonal to the flat plate portion. The pipe joint according to claim 2, wherein the upright portion is disposed inside the outermost diameter of the female member in a side view.

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