JP2009019652A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance work operability and easiness in manufacturing and to reduce weight in a pipe joint for sealing by deforming sleeve bodies in confronting tapered wall surfaces arranged for a joint body and an operation member (a connecting body). <P>SOLUTION: The pipe joint is structured by the joint body provided with a connection cylinder part 13 formed in the tapered wall surface 131 in an inner circumferential surface of an opening end part, the connecting body with an external fit part 21 tightly fit and externally inserted to an outer circumferential surface of the connection cylinder part and the tapered wall surface 221 and the sleeve bodies 3 for tightly adhering and pressing an outer circumferential surface of a connected pipe inserted in the joint body at both ends by being deformed by pressure as tightly adhering with respective tapered wall surfaces when the connecting body is externally fit to the joint body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint used for metal piping of various facilities such as gas, air conditioning, hydraulic pressure, and hot water.

  As pipe connection means for metal pipes of various facilities, techniques such as welding and connection by screw formation to the pipe itself have been carried out, but due to various factors such as work site conditions, pipe wall thickness, material, etc. When the means cannot be employed, a pipe joint that does not require any processing on the piping itself is employed.

  As these pipe joints, as disclosed in Patent Documents 1 and 2 (Japanese Patent Laid-Open No. 8-170768, Japanese Utility Model Laid-Open No. 7-8683), the basic configuration thereof is a joint body, a tightening nut body, and the like. And a joint body is formed by forming a screw wall on the outer peripheral surface of the opening end side of the joint body and forming a tapered wall surface on the inner peripheral surface. An annular groove (short inner cylinder) and an inner cylinder portion of the pipe to be connected are provided at the end. The other tightening nut body has a threaded portion and a tapered wall surface that are threadedly engaged with the outside of the opening end of the joint body on the inner peripheral surface, and the sleeve body is sized to be externally inserted into the connected pipe.

  The pipe joint is formed by mounting a sleeve body on a pipe to be connected, inserting the pipe to be connected into a joint body, fitting a tip of the pipe into an annular groove, or extrapolating the inner cylinder portion, and attaching a tightening nut body to the joint. The sleeve body is deformed by screwing and tightening to the main body, and pressing with the respective taper wall surfaces, and the outer peripheral surface of the connected pipe inserted into the joint main body is pressed and pressed at both ends of the sleeve body to achieve sealing. Is.

JP-A-8-170768. Japanese Utility Model Publication No. 7-8683.

  By the way, metal piping in buildings is often stored in a narrow pipe space. For this reason, in the above-described conventional pipe joint that employs a screwed structure by screws for mounting the joint body and the tightening nut body, the screwing operation may be troublesome.

  In addition, reducing the weight of the pipe joint also reduces the weight of the entire metal piping, especially in the case of installation piping, which reduces the amount of bending, which has great merit on the piping equipment, Since screwing is employed, a hexagonal portion for screw operation is provided, which is a major obstacle to weight reduction.

  Furthermore, there is a problem that the hexagonal portion is formed and a threaded portion must be formed on the joint body or the nut body, which is troublesome in terms of manufacturing.

  Therefore, the present invention proposes a pipe joint for metal piping that realizes improvement in workability, weight reduction and manufacturability.

  A pipe joint according to the present invention (Claim 1) is a fitting body having a connecting cylinder part formed on a tapered wall surface that expands an inner peripheral surface of an open end to the outside, and a tight fit to the outer peripheral surface of the connecting cylindrical part. When the extrapolated part to be extrapolated, and a connecting body provided with a tapered wall surface facing the tapered wall surface of the connecting cylinder part continuously to the extrapolating part, and when the connecting body is extrapolated to the joint body, It is formed by a sleeve body that is deformed by tight pressing with a tapered wall surface and that tightly presses the outer peripheral surface of the connected pipe inserted into the joint body at both ends.

  Thus, the tube to which the sleeve body is extrapolated is inserted into the coupling cylinder portion of the joint body, and the extrapolation portion of the coupling body that is preliminarily fitted to the tube to be connected is wrapped around the coupling cylinder portion. When press-fitted, the sleeve body is deformed by pressing the tapered wall surface of the joint body and the tapered wall surface of the coupling body, and both ends of the sleeve body are pressed against the outer peripheral surface of the connected pipe to achieve sealing. Due to this deformation of the sleeve body, a force in the outer peripheral direction is applied to the connecting cylinder portion, and it is pressed against the extrapolated portion, and as a result, the joint body and the connecting body are integrated.

  Further, according to the present invention (Claim 2), in the above-described pipe joint, the inner cylinder part that protrudes outward from the opening end from the back side of the tapered wall surface of the coupling cylinder part of the joint body and extrapolates the connected pipe. In particular, when the pipe diameter of the pipe to be connected is large, complete sealing is realized by providing the inner cylinder portion like the conventional pipe joint.

  Further, according to the present invention (Claim 3), a locking protrusion is formed on the inner peripheral surface of the front portion of the extrapolated portion of the coupling body, and the locking protrusion at a predetermined position where the sleeve body is in a predetermined deformation state when the pipe is connected. The coupling concave portion is provided on the outer peripheral surface of the coupling cylinder portion of the joint body corresponding to the coupling portion, and in the connected state of the pipe to be connected, the coupling body is detached by the engagement of the locking concave portion and the locking projection. A stop is made, and the integration of the joint body and the connecting body becomes more perfect.

  Further, according to the present invention (Claim 4), in the above-described pipe joint, an appropriate number of shallow ridges are formed on the outer peripheral surface of the front part of the connecting cylinder part of the joint body. Contact resistance between the inner peripheral surface of the insertion portion and the outer periphery of the connecting cylinder portion is reduced, and the connection operability is improved.

  The configuration of the present invention is as described above, and the pipe to be connected is connected only by press-fitting and extrapolating the extrapolation part of the coupling body to the coupling cylinder part of the joint body without adopting the conventional threaded coupling. Thus, it is possible to perform the pipe connection work in a narrow pipe space, and only the press-fitting operation is required, and the workability is remarkably improved as compared with the screw connection work. Furthermore, since it is not necessary to form a screw, manufacturing is facilitated, and a hexagonal outer periphery for screwing operation is not required, so that the weight of the pipe joint can be reduced and the weight of the entire pipe can be reduced. Is.

  Next, an embodiment of the present invention will be described. The pipe joint shown in the embodiment includes a joint body 1, a connecting body 2, and a sleeve body 3.

  The joint body 1 has an inner tube portion 12 and a connecting tube portion 13 provided on the left and right sides of the main body portion 11, respectively. The inner tube portion 12 has an outer diameter corresponding to the inner diameter of the connected pipe A, and is a connecting tube. A length is appropriately projected outward from the tip of the portion 13, and the left and right inner cylinder portions 12 communicate with each other to constitute a part of the piping path.

  The connecting tube portion 13 is formed on a tapered wall surface (inclination angle of about 30 degrees) 131 that expands the inner peripheral surface of the opening end to the outside, and the outer peripheral surface of the inner tube portion 12 is formed on the back side of the tapered wall surface 131. The fitting deep groove 132 of the to-be-connected pipe A formed by is provided.

  Further, a locking recess 133 corresponding to a locking protrusion 211 of the connecting body 2 described later is provided on the outer peripheral surface of the connecting cylinder portion 13, and an appropriate number of shallow concave stripes 134 are formed on the outer peripheral surface near the opening end. It is made.

  The connecting body 2 is composed of an outer insertion portion 21 and a pressing main body portion 22 having different inner diameters, and the outer insertion portion 21 has an inner diameter that is tightly fitted and inserted on the outer peripheral surface of the connecting cylinder portion 13. The pressing main body portion 22 is provided with a tapered wall surface 221 that is continuous with the outer insertion portion 21 and faces the tapered wall surface 131 of the connecting cylinder portion 13.

  In addition, a locking projection 211 that slightly protrudes toward the tube center axis is formed on the inner peripheral surface of the front portion of the outer insertion portion 21, and the locking recess 133 corresponding to the locking projection 211 is formed at the time of pipe connection. The sleeve body 3 is formed at a position facing the locking projection 211 at a predetermined position where the sleeve body 3 is in a predetermined deformation state.

  The sleeve body 3 is the same as the sleeve body of the conventional pipe joint, and is sized to be externally inserted into the connected pipe A that is closely inserted into the inner cylinder portion 12, and the thickness thereof is not uniform, but one end side is thin and the other end side is It is formed so as to be gradually thicker toward the shape to be easily bent and deformed.

  Thus, the connecting body 2 is extrapolated from the connecting end portion of the connected pipe A so that the outer insertion portion 21 is located on the connecting end side, and the sleeve body 3 is also extrapolated to connect the connecting end of the connected pipe A, It inserts between the outer peripheral surface of the inner cylinder part 12 of the coupling main body 1 and the inner peripheral surface of the connection cylinder part 13, and inserts a connection end to the back of the fitting deep groove 132. FIG.

  And the sleeve body 3 is inserted until it collides with the taper wall surface 131 of the connection cylinder part 13, and the extrapolation part of the connection body 2 is press-fit so that the connection cylinder part 13 may be wrapped.

  At the time of the press-fitting, since the locking projection 211 at the tip of the outer insertion portion 21 is slightly smaller in diameter than the outer diameter of the connecting cylinder portion 13, the outer insertion portion 21 is slightly expanded and press-fitted by metal elasticity. In particular, the shallow recess 134 on the outer peripheral surface of the connecting cylinder part 13 reduces the contact resistance (press-fit resistance) between the inner peripheral surface of the extrapolation part (the locking projection 211) and the outer periphery of the connecting cylinder part 13.

  By the press-fitting of the connecting body 2, the sleeve body 3 is deformed into a bay shape by pressing the tapered wall surface 131 of the joint body 1 and the tapered wall surface 221 of the connecting body 2, and both ends of the sleeve body 3 are the outer periphery of the pipe A to be connected. The surface is tightly pressed and simultaneously pressed against the inner cylinder portion 12 to realize sealing.

  Further, at the same time as the sealing, when the locking projection 211 reaches the locking recess 133 due to the press-fitting of the connecting body 2, the elastic expansion action of the portion of the outer insertion portion 21 is released and the both engage, The movement of the body 2 in the retaining direction is prevented, and the coupling body 1 and the coupling body 2 are completely integrated.

  Therefore, the connection pipe A and the joint body 1 are connected by the movement of the connecting body 2 in the tube axis direction (press fitting of the outer insertion portion 21 into the connecting cylinder portion 13), and a screwing structure is adopted. Compared with the pipe joint of the conventional sleeve body 3 which is deformed by the tapered wall surface, the workability is greatly improved, and it is easy to manufacture without the need for screw formation for the screwed structure, and the weight can be easily reduced. Was able to.

  The present invention is not limited to the above-described embodiment. When the pipe A to be connected has a small diameter, the inner cylinder portion 12 is not required, and the locking recess 133 and the locking protrusion 24 are not required. However, when the inner diameter of the outer insertion portion 21 is made slightly smaller than the outer diameter of the connecting cylinder portion 13 so that the outer insertion portion 21 is expanded by metal elasticity during the connection press-fitting, the locking projection 211 and the engagement Even if the stop recess 133 is not provided, the joint body 1 and the coupling body 2 can be reliably integrated. The formation of the concave stripe 134 is also arbitrary.

The whole exploded perspective view of the embodiment of the present invention. FIG. Explanatory drawing of the connection state (partial sectional view before connection). Explanatory drawing of the connection state (partial sectional view after connection).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint main body 11 Main body part 12 Inner cylinder part 13 Connection cylinder part 131 Tapered wall surface 132 Fitting deep groove 133 Engagement recessed part 134 Concavity 2 Connection body 21 Insertion part 211 Engagement protrusion 22 Pressing body part 221 Taper wall surface 3 Sleeve body

Claims (4)

  A joint body provided with a connecting cylinder part formed on a tapered wall surface that expands the inner peripheral surface of the opening end to the outside, an extrapolation part that is tightly fitted on the outer peripheral surface of the connection cylinder part, and the extrapolation part When the connecting body having a tapered wall surface continuously facing the tapered wall surface of the connecting cylinder portion and the connecting body is extrapolated to the joint body, the connecting body deforms due to the close contact with each tapered wall surface, A pipe joint comprising a sleeve body that tightly presses an outer peripheral surface of a connected pipe inserted into a joint body.   The pipe joint according to claim 1, further comprising an inner cylinder part that protrudes outward from the opening end from the back side of the tapered wall surface of the coupling cylinder part of the joint body, and extrapolates the connected pipe.   A coupling projection of the coupling body corresponding to the latching projection at a predetermined position where the sleeve body is in a predetermined deformed state when the pipe body is connected, while forming a latching projection on the inner peripheral surface of the front portion of the extrapolated portion of the coupling body The pipe joint according to claim 1, wherein a locking recess is provided on the outer peripheral surface of the pipe joint.   The pipe joint according to any one of claims 1 to 3, wherein an appropriate number of shallow concave stripes are formed on the outer peripheral surface of the front part of the connecting cylinder part of the joint body.

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