JPS62118185A - Joint fitting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to flexible pipe bodies such as tubes and hoses used for hydraulic, pneumatic, or transfer of various fluid substances such as chemicals. This invention relates to a joint fitting that can be easily and reliably connected.

[Conventional technology]

Conventional joint fittings of this type, for example when transferring fluid under high pressure, can be broadly classified into, for example, Utility Model Opening No.
As shown in Japanese Utility Model Publication No. 128990, Japanese Utility Model Application Publication No. 59-15884, etc., a pipe body is inserted into an annular space formed by a nipple provided in a joint body and a sleeve coupled to the joint body, and the sleeve There are those that are configured to be fixed by crimping from the outer periphery of the socket, and those that are composed of a socket and a nipple and that the tube is inserted into the tube insertion hole of the socket, as disclosed in, for example, U.S. Patent No. 2,768,009. There is a user pull fitting, etc., in which a nipple whose tip has an outer diameter larger than the inner diameter of the tube is inserted, and the outer peripheral surface of the tube is fixed in pressure contact with the inner wall of the insertion hole.

[Problem that the invention seeks to solve]

However, the former method described above requires a crimping machine and a special jig, which not only has the disadvantage that it cannot be easily connected when necessary, but also due to the size of the pipe body. There are problems in that the jig must be replaced every time the shape of the fitting changes, and the crimping machine and jig are expensive. In addition, there are manual crimping machines that are inexpensive, but they are inefficient and require considerable force when connecting large diameter pipes, so they are not suitable for making many connections. . Furthermore, since an adapter is required to connect the device, it is time-consuming and increases the cost of the mounting parts, and the connection points are longer, which requires additional space for the pipe arrangement. .

In addition, the latter glue user-pull type fittings do not require a crimping machine or special jig and can be connected on-site, but there is a risk that the nipple may enter the pipe diagonally. Furthermore, due to the screws formed on the inner circumferential surface of the socket's tube body insertion hole, the fiber reinforcement layer of the high-pressure hose may be threaded during insertion, and furthermore, it takes an unexpectedly long time to insert the socket and nipple while screwing them into the tube body. Such,
It's not necessarily easy to use.

The present invention solves the problems of the prior art, and provides an economical joint metal fitting that can be easily and securely connected without using any special equipment or tools, can be miniaturized, and has a small number of parts. Its purpose is to provide.

[Means for solving problems]

The present invention has been made in view of the problems of the prior art described above, and therefore, according to the present invention, there is provided an inner cylindrical portion having an annular convex portion on the outer circumferential surface and fitting inside the tube body, and It has a pressing part that is located closer to the end of the tube than the annular convex part of the part and presses the tube from the outer circumferential surface, and has a clamping force receiver part on the outer circumferential surface of the end part for pressing the pressing part. The inner cylindrical part is substantially concentrically surrounded to form a tube receiving groove therebetween, and an outer cylindrical part having an annular recess from the surface pressing part to the end of the tube is formed at the end. A joint body is provided for the joint body, and the clamping force receiver of the outer cylinder part which is screwed onto the joint body is engaged with the clamping force applying part which reduces the diameter of the outer cylinder part using the annular recess as a displacement point. The fitting comprises a tightening nut that presses the pressing portion of the pipe against the outer circumferential surface of the pipe body.

In this configuration, it is advantageous if the tightening force receiver of the joint body has a tapered portion, and the tightening force receiving portion of the tightening nut that engages with the tightening force receiver is formed into a tapered hole.

Furthermore, the annular convex part of the inner cylinder part is composed of a tapered part whose diameter increases in the direction of insertion of the pipe body, and a straight part that continues to this tapered part, and the tightening nut that is screwed into the joint body is attached to the outside of the joint body. It is preferable to provide a second tapered hole and a straight hole in sequence following the tapered hole that engages with the tapered part of the cylindrical part. The annular recess may be formed on the outer peripheral surface, the inner peripheral surface, or even both surfaces.

[Effect]

According to this invention, as described above, a tube body receiving groove is formed at the end by the inner tube portion and the outer tube portion, and furthermore, the inner tube portion has an annular convex portion on the outer circumferential surface, and the outer tube portion has an annular convex portion. The clamping force receiver is provided with, for example, a tapered portion at its end, and is located closer to the end of the tube than the annular convex portion of the inner cylinder, and presses the inserted tube from the outer circumferential surface. A joint body is formed to have a pressing part to press the part, and further has an annular recess on the end side of the tube body from the pressing part, and a clamping force receiving part of the outer cylindrical part of this joint body is engaged with the part to impart a clamping force. For example, the part has a tapered hole, and is screwed into a male thread formed on the outer circumferential surface of the joint body, and the outer cylinder part is pressed by the tapered hole to reduce the diameter using the annular recess as a displacement point. Since it is equipped with a tightening nut that presses the pressing part of the cylindrical part against the outer peripheral surface of the tube, the tube inserted into the tube receiving groove of the joint body can be tightened by tightening the tightening nut. The clamping force imparting part provided inside engages with the clamping force receiving part of the outer cylinder part, deforms the outer cylinder part inward from its tip, and presses the pressing part in the direction of the thickness of the tube body. , is clamped and locked between the inner cylinder part and the pressing part.

In this case, the pressing part of the outer cylinder part is able to press the pipe with a small force due to the existence of the annular recess provided on the end side of the pipe body from the pressing part, that is, the annular recess serves as a displacement point during deformation. Since it is displaced in the thickness direction, the tightening nut can be easily tightened.

In addition, the tube body has, on the tube end side of the annular convex portion of the inner tube portion,
It is pressed from the outer peripheral surface in the direction of the thickness of the tube by the pressing part of the outer cylinder part, and is latched onto an annular convex part provided on the outer peripheral surface of the inner cylinder part to prevent movement in the direction of pulling out the tube. In addition, since the outer cylinder part and the inner cylinder part are formed substantially concentrically and integrally with the joint body, the axis of the inserted pipe body is stable and securely locked. , the pull-out strength is significantly improved, and the airtightness is also significantly improved.

In addition, it is advantageous if the tightening force receiving portion of the joint body is formed into a tapered shape, and the tightening force imparting portion of the tightening nut is formed into a tapered hole, since this allows smooth inward deformation of the outer cylindrical portion. Furthermore, the annular convex part of the inner cylindrical part of the joint body is composed of a tapered part whose diameter increases from the tip in the direction of insertion of the pipe body, and a straight part continuing from this taper part, and the outer cylindrical part is used as a tightening nut. If a second tapered hole and a straight hole are provided following the tapered hole that engages with the part, in addition to the above effects, when tightening the tightening nut, the inner peripheral surface of the tightening nut will be damaged. Due to the existence of the second tapered hole provided, the inner circumferential surface of the tightening nut does not get caught on the tube body and damage the tube body, and not only can it be tightened smoothly, but also the tube body can be tightened smoothly. The straight part of the annular convex part of the inner cylindrical part and the straight hole part of the inner peripheral surface of the tightening nut are also clamped and locked, and the pull-out strength and airtightness are further improved.

〔Example〕

FIG. 1 is a longitudinal sectional side view showing a state before a high-pressure hose is inserted as a pipe body 2 into a fitting l according to the present invention and tightening is completed, and the fitting fitting 1 is composed of a fitting main body IO and a tightening nut 20. There is.

In the embodiment, the joint body 10 is made of metal, and has a tapered part +1 in the middle part of the outer peripheral surface as an annular convex part whose diameter increases from the distal end side toward the insertion direction of the tube body 2. An inner cylindrical portion 12 that fits inside, and an outer cylindrical portion 14 that substantially concentrically surrounds the inner cylindrical portion 12 and forms a tube receiving groove 13 for receiving the tube 2 therebetween. and is provided at one end. Furthermore, this outer cylinder part 14 is placed either at a tip part 15 as a pressing part that presses the inserted pipe body 2 from the outer circumferential surface, or near a stepped part 16 on the end side of the pipe body 2 of the taper WJ11 of the inner cylinder part 12. At the same time, there is a tapered portion 1 on the outer peripheral surface of the tip portion 15 as a tightening force receiving portion.
7, a male threaded portion 18 is formed on the outer peripheral surface of the base, and an annular recess I9 is provided between the male threaded portion I8 and the tapered portion 17. On the other hand, tighten the tightening nut 2
0 is made of metal, and has a female threaded portion 21 that is screwed into the male threaded portion 18 of the joint body IO, and further includes this female threaded portion 21.
Continuing thereto, a tapered hole portion 22 is provided as a tightening force imparting portion that engages with the tapered portion 17 of the outer cylindrical portion 14 of the joint body 10.

Next, the manner of use of the joint fitting 1 according to the present invention will be explained based on FIGS. 1 and 2. Note that FIG. 1 shows the state before the tightening is completed, and FIG. 2 shows the state after the tightening is completed.

As shown in Figure 1, first tighten the nut 2.
After inserting the tube body 2 into which the tube 0 has been inserted into the tube body receiving groove I3 of the joint body 10, the tightening nut 20 is inserted into the joint body IO.
Screw into the male thread part ■8 and tighten. When the tightening nut 20 is tightened, the tapered hole 22 of the tightening nut 20 comes into contact with the tapered section I7 of the outer cylinder section 14, and when the tightening nut 20 is further tightened, as shown in FIG.
The outer cylindrical portion 14 of No. 0 is deformed inward from its tip 15 using the annular recess 19 provided on the outer circumferential surface as a displacement point and is reduced in diameter, and as a result of pressing the tube 2 from the outer circumferential surface, the tube 2 becomes The distal end portion 15 of the outer cylinder portion 14 and the inner cylinder portion 12 are clamped and locked, providing good pull-out strength and airtightness. Furthermore, in addition to the above operations and effects, the tube body 2 has an annular convex portion 1 of the inner tube portion 12.
On the end side of the tube body 1, the end portion 15 of the outer cylinder portion 14 presses strongly from the outer peripheral surface in the thickness direction of the tube body 2, so that the end edge of the stepped portion 16 of the annular convex portion 11 is pressed against the tube body 2. As a result, the pull-out strength is significantly improved.

Moreover, FIG. 3 is a longitudinal sectional side view showing another embodiment of the joint fitting according to the present invention. In the figure, the joint main body 30 of the joint fitting 3 has a tapered part 32 in the middle part of the inner cylinder part 31 that increases in diameter from the tip side toward the insertion direction of the pipe body 2.
An annular convex portion 34 consisting of a straight portion 33 following the tapered portion 32 is provided, and the outer cylinder portion 35 is further provided with an annular recess 36 on the outer circumferential surface as in the previous embodiment. On the other hand, the tightening nut 40 has a structure in which a second tapered hole 42 and a straight hole 43 are provided following a tapered hole 41 serving as a tightening force imparting section.

In the case of such a configuration, in addition to the functions and effects described in the above embodiment, the inserted pipe body 2 can be inserted into the straight hole 43 of the tightening nut 40 and the straight part 33 of the annular convex part 34 of the joint body 30. As a result of being clamped and locked,
The pull-out strength and airtightness are further improved. In addition,
In this case, it is of course possible to use a spherical surface instead of the second tapered hole 42 provided in the tightening nut 40 for smooth tightening.

In the two embodiments described above, the tightening force receiving part of the joint body and the tightening force imparting part of the tightening nut are respectively a tapered part and a tapered hole part that engages with this tapered part. may be formed into a spherical shape, or both may be formed into a spherical shape, and furthermore, the tube body insertion groove may be changed to a groove of any shape.

Furthermore, various materials can be used to form the joint body and the tightening nut, such as metal materials such as stainless steel, brass, and iron, or hard plastics.In particular, if plastic materials are used, they can be repeatedly attached and detached. It can also be used as a fitting. Further, the annular recess of the outer cylinder part of the joint body may be provided on the inner circumferential surface of the outer cylinder part or on both surfaces, and the position, shape, and number of the annular recesses can be arbitrarily selected.

〔Effect of the invention〕

As explained above, according to the present invention, a tube body receiving groove is formed at the end of the inner tube portion and the outer tube portion, and furthermore, the inner tube portion has an annular convex portion on the outer peripheral surface, and the outer tube portion has an annular convex portion. The part is provided with a clamping force receiving part at its tip, and a pressing part that presses the inserted tube from the outer peripheral surface is located closer to the end of the tube than the annular convex part of the inner tube. The joint body has four annular parts on the side of the tube end from the pressing part, and the clamping force receiver of the outer cylinder part of this joint body has a clamping force imparting part that engages with the part, and the outer cylinder is screwed into the joint body. pressing the part inward by the tightening force imparting part to deform the annular recess of the outer cylinder part as a displacement point,
Since the joint is equipped with a tightening nut that presses the pressing part of the outer cylinder against the outer circumferential surface of the tube, the joint has excellent pull-out strength and airtightness, and is highly reliable.

In addition, all you have to do is insert the pipe into the annular groove of the joint body and tighten the nut with a wrench, etc., without using any special equipment or tools, so the connection is easy and workable, and there are fewer parts. , it becomes an economical fitting.

Furthermore, not only can it be made smaller than conventional joint fittings, but it can also be repeatedly attached and detached depending on the material forming the joint body, so its practical effects are extremely large.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the shape of the annular convex portion, the number of positions, etc. may be changed, the joint body may be made into an elbow shape, a T-shape, etc. Of course, various changes can be made within the technical idea of the present invention, such as changing the shape and further changing the shape of the tightening nut.

[Brief explanation of drawings]

Fig. 1 is a vertical side view showing a state in which a high pressure hose is inserted into a joint fitting according to the present invention, Fig. 2 is a longitudinal side view showing a state in which the connection is completed by tightening the tightening nut, and Fig. 3 is a joint according to the present invention. FIG. 7 is a longitudinal side view showing the connection state of different embodiments of the metal fittings. ■, 3: Joint fittings, 10.30: Joint body, 11
．． 34: Annular convex portion, 12.31: Inner cylinder portion, 13:
Pipe body receiving groove, 14: Outer cylinder part, 15 Two pressing parts,
z7: Tightening force receiving part, 19.36 Annular recess, 20.40: Tightening nut, 22.42: Tightening force imparting part. Patent applicant: Junko Co., Ltd. 10: ε-plug model book

Claims (5)

[Claims] (1) An inner cylindrical part that has an annular protrusion on the outer peripheral surface and fits inside the tube, and a part that is closer to the end of the tube than the annular protrusion of the inner cylindrical part and presses the tube from the outer periphery. and a clamping force receiving part on the outer peripheral surface of the end portion for pressing the pressing part, substantially concentrically surrounding the inner cylindrical part and having a tube receiving groove therebetween. a joint body having an outer cylindrical part formed at the end thereof and having an annular recess on the side of the tube end from the pressing part, and a tightening member that is screwed onto the joint body and engages with a tightening force receiving part of the outer cylindrical part. A joint fitting comprising a tightening nut that reduces the diameter of the outer cylinder part using the annular recess as a displacement point by a force imparting part and presses a pressing part of the outer cylinder part against the outer circumferential surface of the tube body. (2) In the joint fitting according to claim 1, the tightening force receiving portion of the outer cylinder portion of the joint body is a tapered portion whose diameter increases in the tube insertion direction, and also provides the tightening force of the tightening nut. A joint fitting characterized in that the part is a tapered hole part whose diameter increases in the direction of insertion of the pipe body. (3) In the joint fitting according to claim 2, the annular convex portion of the inner cylinder portion of the joint body consists of a tapered portion whose diameter increases in the tube insertion direction and a straight portion following this tapered portion. The tightening nut is characterized by having a second tapered hole portion following the tapered hole portion that engages with the tapered portion of the outer cylindrical portion of the joint body, and a straight hole portion following the second tapered hole portion. Fittings to be used. (4) The joint fitting according to any one of claims 1 to 3, wherein the pressing portion of the joint body is a distal end portion of the outer cylindrical portion. (5) The joint fitting according to any one of claims 1 to 4, wherein the annular recess of the outer cylindrical portion of the joint body is provided on the outer peripheral surface.