Search

EP-3933242-B1 - JOINT STRUCTURE

EP3933242B1EP 3933242 B1EP3933242 B1EP 3933242B1EP-3933242-B1

Inventors

  • YAMAGUCHI, OSAMU
  • HARA, YOSHITAKA

Dates

Publication Date
20260506
Application Date
20200212

Claims (3)

  1. A joint structure (10) comprising: a hollow joint body (1); a first sleeve (2) that has an inner cavity, into which a pipe (100) is inserted, and has one end part coming into contact with the joint body (1); a second sleeve (3) that has a hole, into which the pipe (100) is inserted, and has one end part coming into contact with the other end part of the first sleeve (2); and a nut (4) that covers one end part of the joint body (1), the first sleeve (2) and the second sleeve (3), and is tightened to the joint body (1) by being threaded onto the joint body (1) in a state of pressing against a surface of the second sleeve (3) on a side opposite from the first sleeve (2), a limiting portion (2d, 4d, 4e) configured to limit deformation in a radial direction of the first sleeve (2) is formed on a surface of the first sleeve (2) that faces the nut (4) and a surface of the nut (4) that faces the first sleeve (2) and the second sleeve (3), the first sleeve (2) has a cylindrical portion (2a) having the inner cavity and a protruding portion (2b) that protrudes inward in a radial direction thereof from one end part of the cylindrical portion (2a), and the protruding portion (2b) comes into contact with the joint body (1), the second sleeve (3) has a contact portion (3b) that comes into contact with the other end part of the cylindrical portion (2a), and an inclined surface (2c) is formed at the end part on the pipe (100) side at the other end of the cylindrical portion (2a) to guide the contact portion of the second sleeve (3) so that, when the nut (4) is tightened to the joint body (1), the contact portion is inserted into the pipe (100).
  2. The joint structure (10) according to claim 1, wherein the limiting portion (4d) includes an inclined portion formed on the surface of the nut (4) that faces the first sleeve (2) and the second sleeve (3) and inclined so that an inner diameter of the nut (4) becomes wider toward the joint body (1).
  3. The joint structure (10) according to claim 1 or 2, wherein the limiting portion (4e) includes a step formed on the surface of the nut (4) that faces the first sleeve (2) so that the joint body (1) side thereof is farther away from the first sleeve (2) than the second sleeve (3) side thereof.

Description

[Technical Field] The present disclosure relates to a joint structure. [Background Art] In piping facilities for circulating fluid, a joint structure for connecting a hollow pipe to another member is used (see PTL 1 and PTL 2). In the piping facilities, it may be necessary to disconnect a pipe, which is connected by the joint structure, in order to repair or replace a part such as the pipe. In order to remove the connected pipe, it is necessary to create a gap between the pipe and another member by moving the pipe in a longitudinal direction thereof. However, in piping facilities in which a plurality of parts such as a pipe are combined, it may be difficult to move the pipe in the longitudinal direction. On the other hand, PTL 3 discloses a joint structure capable of disconnecting a pipe by sliding the pipe in a direction orthogonal to the longitudinal direction. PTL 4 discloses a device has an attraction unit (2) screwable on a connector (1). A conical clamping ring (4) comprising a constricting part (9). A wedge ring (3) comprises a cutting edge (27), which is adapted to engage with an external periphery of a pipe (5) to be fastened at the connector. The pipe is partially clasped by the clamping ring. The wedge ring comprises a nose taper (15), which is insertable into an interior chamfer of the clamping ring. The wedge ring is displaceable to the clamping ring by the attraction nut. [Citation List] [Patent Literature] [PTL 1] Japanese Translation of PCT Application No. 2007-502940[PTL 2] Japanese Translation of PCT Application No. 2009-522525[PTL 3] Japanese Utility Model Registration No. 3195332[PTL 4] DE 10 2012 103878 A1 [Summary of Invention] [Technical Problem] However, in the joint structure described in PTL 3, one end of the pipe has to be machined by flaring, which incurs time and effort. An object of the present disclosure is to provide a joint structure capable of disconnecting a pipe without moving the pipe in the longitudinal direction, even if the pipe is not machined. [Solution to Problem] The invention is a joint structure according to the technical features of claim 1. Advantageous embodiments of the invention ar defined in the dependent claims. [Advantageous Effects of Invention] According to the present invention, it is possible to disconnect a pipe without moving the pipe in the longitudinal direction, even if the pipe is not machined. [Brief Description of Drawings] [Fig. 1] Fig. 1 is an axial longitudinal sectional view illustrating a joint structure in a connected state, not part of the invention.[Fig. 2] Fig. 2 is an axial longitudinal sectional view illustrating the joint structure of Fig. 1 in a disconnected state.[Fig. 3] Fig. 3 is an enlarged view of region A in Fig. 1.[Fig. 4] Fig. 4 is an axial longitudinal sectional view illustrating a state in which the tip of a second sleeve is inserted into the outer periphery of a pipe, illustrating the completion of tightening of a nut in the the joint structure of Fig. 1.[Fig. 5] Fig. 5 is an axial longitudinal sectional view illustrating a joint structure in a connected state.[Fig. 6] Fig. 6 is an axial longitudinal sectional view illustrating a joint structure in a connected state.[Fig. 7] Fig. 7 is an axial longitudinal sectional view illustrating a joint structure in a connected state.[Fig. 8] Fig. 8 is an axial longitudinal sectional view illustrating another joint structure in a connected state, not part of the invention.[Fig. 9] Fig. 9 is an axial longitudinal sectional view illustrating another joint structure in a connected state, not part of the invention.[Fig. 10] Fig. 10 is an axial longitudinal sectional view illustrating another joint structure in a connected state, not part of the invention. [Description of Embodiments] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figs. 1 to 4 are axial longitudinal sectional views illustrating a joint structure, not part of the invention. A joint structure 10 illustrated in Figs. 1 to 3 is a structure that connects a hollow pipe 100 to another member (a manifold 101 in the example of the drawing). Fig. 1 illustrates the joint structure 10 in a connected state in which the pipe 100 and the manifold 101 are connected, and Fig. 2 illustrates the joint structure 10 in a disconnected state in which the connection between the pipe 100 and the manifold 101 is released. Fig. 3 is an enlarged view of region A of Fig. 1. Fig. 4 is a diagram illustrating the completion of tightening of a nut. In the drawings, the axial direction is the X direction, and the radial direction (the direction perpendicular to the axis) is the Y direction. As illustrated in Figs. 1 to 4, the joint structure 10 includes a hollow joint body 1, a first sleeve 2 and a second sleeve 3, and a nut 4 arranged across one end part of the joint body 1 and one end part of the pipe 100 in a connected state. In the connected state, the joint body 1, the first sleeve 2, and the s