JP2005299910A - Pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a tube T turns simultaneously when tightening a cap nut, the tube between instruments is twisted and the blockage occurs in a case of the structure to compress the thickness of the tube with the gap C between the maximum outside diameter D of a tube connection part of a joint body 2 and the minimum inside diameter part d of the cap nut 6 as shown in Fig. 2 in the conventional tightening joint. <P>SOLUTION: The cap nut is divided into a cap nut body 4 and a sleeve 5 in order to prevent the turning of this tube and then the sleeve 5 is pressed into the cap nut body 4 in the condition as the sleeve 5 can be turned. The pipe joint is structured such that the sleeve 5 and the tube T are not turned even if tightening the cap nut body 4. The performance of the pipe joint is satisfied and cost is kept low by limiting the increase of component numbers to the minimum. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint used for a pipe tube used for fluid transfer in an atmospheric pressure or hydraulic system.

  The conventional tightening type joint has a connection as shown in FIG. 2, but the joint body 2 having a tube connection portion outer diameter D larger than the inner diameter of the tube T to be connected to the joint body 2 of FIG. 11, In the cap nut 6 screwed into the joint shown in FIG. 12, the tube thickness is compressed by the gap C in FIG. 2 between the tube connecting portion maximum outer diameter D of the joint body 2 and the cap inner diameter portion d of the cap nut 6. It is made up of a structure that

  In this structure, the wall thickness of the tube T is compressed by tightening the cap nut, and at this time, the tube rotates in the same direction as the cap nut and twists.

  When the tightening joint as shown in FIG. 2 is used, when the cap nut 6 is tightened, as the cap nut 6 is tightened, the minimum inner diameter portion d of the cap nut 6 in FIG. The maximum outer diameter portion of the tube is close to D, and the thickness of the tube is compressed by the gap C between the two, thereby maintaining the performance of the joint.

  Here, when the cap nut 6 is further tightened, the tube T is compressed and the resistance is increased. When the cap nut 6 rotates in the tightening direction of the cap nut 6 at the same time and is attached between the devices, the tube T is attached. When the twist occurs and is severe, the fluid transfer resistance increases or the tube T is blocked.

  In order to solve the above problems, in the pipe joint 1 of FIG. 1 according to the present invention, the cap nut 3 is divided into a cap nut main body 4 and a sleeve 5 so that the sleeve 5 can be rotated on the cap nut main body 4. The groove 41 of FIG. 5 having a diameter larger than the sleeve outer diameter portion 51 is provided, and the shape of FIG. 8 is provided in the upper portion of the groove 41 as shown in FIG. 6, and the depth 42 of the groove 41 is the length of the sleeve 4 of FIG. Set slightly longer than 52.

  The outer diameter of the sleeve 4 is set to be narrower than the inner diameter of the groove 31 of the cap nut body 3, and the shape of FIG. 8 is provided on the upper portion of the sleeve 4 set to be slightly shorter than the depth 32 of the groove 31 of the cap nut. The outer diameter 42 of the shape of the sleeve 4 in FIG. 8 is set slightly narrower than the inner diameter 33.

  When the sleeve 5 is press-fitted into the cap nut body 4, the sleeve outer diameter portion 51 is rotatably inserted into the groove 41, and the cap nut 3 is tightened after the tube T is attached to the tube connection portion of the joint body 1. However, since only the cap nut main body 4 is screwed and the sleeve 5 does not rotate in the process of compressing the tube and proceeds in the axial direction, the tube is not twisted.

  In order to achieve the above object, in the pipe joint 1 according to the present invention, the cap nut 3 is divided into the cap nut main body 4 and the sleeve 5 so that the cap nut main body 4 and the sleeve 5 can be rotatably inserted. In addition, the dimensions after completion of tightening are the same as those of the conventional product, the same level of performance can be maintained, and the increase in the number of parts and processes can be minimized, thereby making it possible to manufacture inexpensive and reliable joints.

  As described above, the joint performance is the same as that of the conventional product due to the structure of the present invention, and the joint structure that prevents the twisting of the tube when connecting the tube and the joint, which could not be prevented from occurring in the conventional product, can be simplified. It becomes possible.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partially longitudinal front view showing an example of an embodiment of the present invention, and FIG. 2 is a partially longitudinal front view showing an example of an embodiment of a conventional product.

  The illustrated pipe joint 1 includes a joint body 2, a tube 3, a cap nut body 4, and a sleeve 5 as main constituent members.

  Here, as shown in FIG. 11, the joint main body 2 has a tube attachment portion 11 and a screw portion 12 that is screwed with the cap nut main body 3, and the tube attachment portion 11 has a maximum outer diameter portion D larger than the tube inner diameter, and the sleeve 5 12 has the same inner diameter portion as the minimum inner diameter portion d of the cap nut 5 in FIG. 12, and the sleeve 5 is inserted into the groove 41 of the cap nut body 4 so that the outer diameter portion 51 of the sleeve 5 is rotatably inserted. Yes.

  FIG. 6 is an enlarged view of the groove portion 41 of the cap nut body. The shape of FIG. 8 is provided with an R portion 45 and an R portion 46 so that the press-fitted sleeve 5 can be smoothly rotated, and after the sleeve 4 is press-fitted. A straight line portion 47 is set perpendicular to the axis for preventing slipping out, and is smoothly connected to the R portion 46 to form the groove portion 41.

  FIG. 9 is an enlarged view of the R portion 53 of the sleeve 5. The R portion 53 is press-fitted into the R portion 45 and the R portion 46 of FIG. 8 of the groove portion 41 of the cap nut body 4, and the state shown in FIG. When the tube T is attached to the joint body 2 and the cap nut 3 is tightened, the R portion 52 of the sleeve 5 is brought into line contact with the R portion 45 and the R portion 46 of the groove portion 41 of the cap nut body 4. Even if the cap nut main body 4 is rotated for tightening, the sleeve 5 and the tube T remain in the same position without rotating, and move in parallel with the axis until the tightening is completed.

  If the structure of the present invention is used, the material of the pipe joint is not limited to metal, and plastics and the like have the same performance.

  The partial longitudinal section front view showing an example of the example of the present invention   Partial longitudinal front view showing an example of a conventional embodiment   Partial longitudinal front view showing a state in which each member of the pipe joint of FIG. 1 is disassembled   Partial longitudinal front view showing the cap nut of FIG.   FIG. 4 is a partially longitudinal front view showing a cap nut body obtained by disassembling the cap nut of FIG.   FIG. 5 is a partially longitudinal front view in which the groove of the cap nut body in FIG. 5 is enlarged.   Partial longitudinal front view showing a sleeve in which the cap nut of FIG. 4 is disassembled   Fig. 5 is a partially enlarged front view of the longitudinal section   FIG. 7 is a partially longitudinal front view of an enlarged R portion of the sleeve of FIG.   Partial vertical front view of the enlarged R part after press-fitting the cap nut body and sleeve of FIG.   1 and 2 partially vertical front view of the joint body 2   Partial longitudinal front view showing the cap nut of FIG.   The partial longitudinal section front view showing an example of the example of the present invention   The partial longitudinal section front view showing an example of the example of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Cap nut 4 Cap nut main body 41 Groove part 42 of a cap nut main body Groove part 45 of a cap nut main body R part 46 of a cap nut main body R part 47 of a cap nut main body Linear part 4a of a cap nut main body Cap nut body 4b Cap nut body 5 Sleeve 51 Outer diameter portion 52 of sleeve 5 Sleeve length 53 R portion 5a Sleeve 5b Sleeve 6 Conventional bag nut T Tube

Claims (1)

  A tube joint used for connecting pipe bodies (hereinafter referred to as tubes) using thermoplastic synthetic resin. It is a joint consisting of only a joint body and a cap nut. And tightening the cap nut by tightening the cap nut in the joint that maintains the airtightness by compressing the tube thickness at the gap between the tube insertion portion and the innermost diameter portion of the cap nut At this stage, the more the nut is tightened, the greater the compression, which causes the tube to rotate simultaneously in the direction in which the nut rotates. To prevent twisting of the tube due to this rotation, the cap nut structure is divided into a sleeve and a nut body. A gap is provided between the nut body and the sleeve, and a step portion of the sleeve receiver is provided on the nut body, and the sleeve is press-fitted into the nut body. When the nut and the sleeve are integrated, and the nut is tightened to the joint body with the tube attached, only the nut body rotates when tightening, and the sleeve and the tube do not always rotate from the same direction. A joint that can prevent twisting of the tube.

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