KR101756526B1 - Pipe coupling apparatus - Google Patents

Abstract

The present invention relates to a pipe connecting device capable of easily and rigidly connecting a pipe, and also capable of completely preventing leakage of a fluid. A pipe connecting apparatus according to the present invention is a pipe connecting apparatus for connecting a pipe for connecting a pipe with a pipe for flowing a fluid. The pipe connecting apparatus includes a main body having an insertion port into which a pipe is inserted, And a cap nut including a fastening member having a first through hole for inserting a pipe into a central portion thereof and a second through hole fastened to the insertion port of the main body and having a pipe inserted into a center portion thereof, A tapered portion whose inner diameter is monotonously decreased from the inlet side to the innermost side of the insertion port is formed on the inner circumferential surface of the insertion port, and the tightening member is provided with an inclined surface whose outer diameter is gradually widened from one end to the other end, And two inclined surfaces are formed along the longitudinal direction, Of the cutting gap is formed, the cap nut is characterized in that the configuration when the fastening to the body to press the fastening member to the inside direction of the insertion port.

Description

[0001] PIPE COUPLING APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device for connecting a pipe provided as a flow passage of fluid or the like and more particularly to a pipe connecting device capable of easily and firmly connecting a pipe, .

In order to supply a fluid such as tap water or gas, a hollow flow tube, which is usually called a pyramid, is employed. A valve for opening and closing the flow of the fluid together with the pipe is employed. Suitable pipe connections are used for connecting pipes to pipes or connecting pipes to valves.

The pipe connecting apparatus is required to have a structure capable of easily performing pipe connection while preventing leakage of fluid that may occur at the connection site and also surely preventing improper disconnection of the pipe from the pipe connection site.

In the conventional pipe connecting apparatus, a suitable fastening member is adopted to prevent the pipe from coming off. The tightening member is adapted to reduce the inner diameter of the pipe when tightening the pipe, thereby preventing the pipe from being detached from the tightening member by tightening the outer peripheral surface of the pipe.

Patent Document No. 10-0958816 (name: pipe connecting device) and patent registration No. 10-0315341 (name: pipe connecting structure) disclose a fastening member having a broken ring-shaped fastening member and a coil-shaped fastening member having a broken sloped end And the patent publication No. 10-2004-0041866 (entitled "Pipe connection device") has a semicircular cross-section and has a cross-sectional shape along the longitudinal direction of the pipe And a fastening member is provided on the inner side surface of the fastening member so as to surround and tighten the outer surface of the pipe by a pair of fastening chucks provided with projections for preventing slippage of the pipe.

Patent Publication No. 2002-0011000 (entitled "Nip ring structure of pipe connection socket") and patent publication 10-2009-0035941 (name: pipe connection structure), patent registration No. 10-1329279 (name: pipe connection structure and pipe Connection method) and a utility model registration No. 20-0246583 (name: plastic tube connector), a tightening member having a ring shape and a cut-out portion at an intermediate portion is disclosed.

FIG. 1 is an exploded perspective view of a pipe connecting apparatus disclosed in the above-mentioned Japanese Unexamined Patent Application Publication No. 2002-0011000, and FIG. 2 is a sectional view of the main part.

In the drawing, a pipe connecting device is constituted by a connection socket 1, a tightening member 7, and a tightening nut 6. The connection socket 1 is provided with a first screw portion 2 for fastening the first pipe 9 to one side and an internal connection pipe 4 and a pipe insertion groove 5 at the other side. And a second threaded portion 3 for fastening the second threaded portion 6 is provided.

The tightening member 7 is formed in a ring shape and has a cutout portion 8 and a protrusion 7a on its inner circumferential surface. The second pipe 10 is inserted into the pipe insertion groove 5 of the connecting socket 1 through the tightening nut 6 and the inner side of the tightening member 7 and then the tightening nut 6 is fastened to the second screw portion 3 . Particularly, inclined surfaces 5a and 6a are provided on the outer edge portion of the pipe insertion groove 5 and the inside of the tightening nut 6, respectively. Therefore, when the tightening nut 6 is fastened to the second screw portion 3, the fastening member 7 is compressed inward according to the fastening strength thereof, so that the tightening force of the fastening member 7 with respect to the second pipe 10 is strong And the protrusion 7a provided on the inner side surface of the tightening member 7 is pushed into the outer peripheral surface of the second pipe 10 so that the tightening force between the tightening member 7 and the second pipe 10 is further increased, 2 pipe 10 is prevented from being improperly detached from the fastening member 7, i.e., the connection socket 1. [

 In addition, the utility model registration No. 20-0120330 (name: one-touch insertion pipe connection port) discloses a fastening member having a ring shape and a plurality of concave grooves formed at both end portions thereof.

3 is an exploded partial cross-sectional view of the pipe connecting hole disclosed in the Utility Model Registration No. 20-0120330, and Fig. 4 is a perspective view showing an external shape of the fastening member 40 in Fig. 5 is a cross-sectional view showing the configuration of the main portion when the pipe is fastened to the pipe fitting.

In the drawing, the pipe connecting port comprises a socket body 20, a cap nut 30, and a tightening member 40. Here, the socket body 20 is provided with a screw connection portion 20a to be screwed to a pipe connection port such as an L-shaped or T-shaped connection port and a screw connection portion 20b to which the cap nut 30 is screwed, The pipe 50 is inserted into the insertion port through the cap nut 30 and the inside of the tightening member 40.

The tightening member 40 is formed in a wide ring shape. The outer circumferential surface of the fastening member 40 is formed with inclined surfaces 40b and 40c inclined toward the center side from the central portion 40a as a starting point toward both ends and a plurality of grooves 41 and 42 are formed at both ends. And an O-ring groove 43 is formed on the inner peripheral surface.

Sloping surfaces 21 and 31 are provided on the inner side of the pipe insertion port of the socket body 20 and the cap nut 30 in correspondence to the inclined surfaces 40b and 40c of the fastening member 40. [ Therefore, when the cap nut 30 is fastened to the threaded connection portion 20b with the tightening member 40 disposed between the socket main body 20 and the cap nut 30, the inclined surfaces 21 and 31 Moves along the inclined surfaces 40b and 40c of the tightening member 40 while pressing the tightening member 40 inward. As a result, the tightening member 40 is compressed in the inward direction and tightly contacted with the pipe 50 disposed inside the pipe 50 to prevent the pipe 50 from being improperly detached from the socket body 20.

However, in the conventional pipe connecting apparatus described above, there is a problem in that the sealing force of the pipe connection or the socket main body and the pipe coupled to the pipe is insufficient, and the fluid may leak through the connection portion.

For example, in the conventional structure shown in Figs. 1 and 2, the fluid flowing through the pipes 9 and 10 leaks to the outside through the fastening portions of the first pipe 9 and the first screw portion 2, After the leakage is made to the inside of the tightening nut 6 through the contact face between the pipe insertion groove 5 and the second pipe 10 and the contact face between the tightening member 7 and the slope face 5a, (6a) and the fastening portion of the second screw portion (3) and the tightening nut (6).

3 to 5, the fluid flowing through the pipe 50 contacts the contact surface between the inclined surface 21 of the socket body 20 and the inclined surface 40b of the fastening member 40, Can be leaked to the outside through the contact surface between the pipe 30 and the pipe 50 and the fastening portion between the cap nut 30 and the screw connecting portion 20b.

In addition, in the conventional pipe connecting apparatus described above, the connecting force of the pipe to the pipe connecting apparatus is determined by the frictional force between the fastening members 7, 40 and the pipes 10, 50. However, when the tightening members 7 and 40 made of a metal material are in contact with the pipes 10 and 50, there is a limit to raise the frictional force beyond a certain level within a limited contact area. In order to raise the frictional force to a predetermined level or more, the tightening force of the tightening member 7.40, that is, the tightening force of the tightening nut 6 and the cap nut 30, must be increased to a certain level or higher, There is a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pipe connecting device which can improve a sealing force between a pipe connecting device and a pipe to reliably prevent leakage of fluid, Have a technical purpose

It is another object of the present invention to provide a pipe connecting device for improving the coupling force between the pipe connecting device and the pipe, thereby reliably preventing the pipe from being improperly detached from the connecting device.

In order to achieve the above object, the present invention provides a pipe connecting device for connecting a pipe for connecting a pipe and a pipe for flowing fluid, comprising: a main body having an insertion port for inserting a pipe; A fastening member disposed between the inner circumferential surface of the insertion port and an outer circumferential surface of the pipe, and a first through hole into which a pipe is inserted at the center, and is disposed between the fastening member and the cap nut And a cap nut having a second through-hole which is fastened to the insertion port of the main body and to which a pipe is inserted in a central portion, and the main body is provided with a pressing member which is provided on the inner circumferential surface of the insertion port and which corresponds to the first inclined surface of the fastening member Wherein the first inclined portion is provided on the outer circumferential surface, Wherein the first and second inclined surfaces are inclined in an inward direction, and the pressing member has a second inclined portion at a tip end thereof corresponding to the second inclined surface.

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And a stopper is formed on the inner circumferential surface of the tightening member.

Further, grooves are formed along the circumferential direction on the inner circumferential surface of the tightening member.

And a first O-ring is provided on an outer peripheral surface of the pressing member.

And a second O-ring is provided on the inner circumferential surface of the second through hole.
In addition, an O-ring groove is formed in the outer peripheral surface of the pressing member, a first O-ring is provided in the O-ring groove, a first step is formed in a rear end of the O-ring groove, And a second pressing protrusion for pressing the first O-ring through the stepped portion is further provided.
A through hole is formed in a central portion of the cap nut. An O-ring groove is formed in an inner circumferential surface of the through-hole. A second O-ring is provided in the O-ring groove. And a second pressing projection for pressing the second O-ring through the second step is further provided at a rear end of the pressing member.

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According to the present invention, it is possible to easily engage and disengage the pipe with respect to the pipe connecting means, reliably prevent the pipe coupled to the main body from being disengaged, It is possible to implement a pipe connecting device which can reliably prevent leakage of water.

1 is an exploded perspective view of a pipe connecting device according to the prior art;
Fig. 2 is a sectional view showing the main part of the pipe connecting device shown in Fig. 1. Fig.
Figure 3 is a partial cross-sectional exploded view of a tube connector according to the prior art;
4 is a perspective view showing an external shape of the fastening member 40 in Fig.
5 is a cross-sectional view of a main portion when a pipe is fastened to a pipe fitting.
6 is an exploded perspective view of a pipe connecting apparatus according to the first embodiment of the present invention.
7 is a cross-sectional perspective view of Fig.
8 is a sectional view of Fig.
Fig. 9 is a cross-sectional view of a pipe connecting device in a state where a pipe is engaged; Fig.
10 is an exploded sectional view according to a first modification of the first embodiment;
11 is a cross-sectional view of the pipe connecting apparatus in FIG.
12 is a partial cross-sectional exploded view of a pipe connecting apparatus according to a second embodiment of the present invention.
13 is an exploded sectional view corresponding to Fig. 12; Fig.
FIG. 14 is a partial cross-sectional perspective view of the fastening member 220 in FIG. 12; FIG.
15 is a partial cross-sectional perspective view of the pressing member 230 in Fig.
16 is a cross-sectional view of a pipe connecting apparatus in a state where a pipe is coupled thereto;
17 is an exploded partial cross-sectional view of a pipe connecting apparatus according to a third embodiment of the present invention.
18 is a partial cross-sectional perspective view of fastening member 320 in Fig.
19 is a cross-sectional view of a pipe connecting device in a state where a pipe is engaged.
20 is a partial cross-sectional perspective view showing a modified configuration example of the tightening member in the third embodiment;
FIG. 21 is a partial cross-sectional exploded view of a pipe connecting apparatus according to a fourth embodiment of the present invention; FIG.
22 is a partial cross-sectional perspective view of fastening member 420 in Fig.
23 is a plan view of the fastening member 420 in Fig.
24 is a cross-sectional view of the pipe connecting device in a state where a pipe is engaged.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood, however, that the embodiments described below illustrate preferred embodiments of the present invention, and that examples of such embodiments are not intended to limit the scope of the present invention. The present invention can be variously modified without departing from the technical idea thereof.

Also, in this specification, the meaning of the pipe connecting device is not limited to any pipe connection including T-shaped, L-shaped and cross-shaped pipes used for pipe connection and the like, additionally employed for connection of these pipe connection and pipe, The pipe connecting device of the present invention includes all the mechanisms and structures that can be employed in the joining of pipes.

6 to 9 are views showing the structure of a pipe connecting apparatus according to the first embodiment of the present invention, Fig. 6 is an exploded perspective view of the pipe connecting apparatus, Fig. 7 is a exploded cross- Is a cross-sectional view of a pipe connecting device in a state where a pipe is coupled.

In addition, the present embodiment shows an example in which the present invention is applied to a T-shaped pipe connector having three insertion ports to which the pipe 100 is coupled and which are configured to communicate with each other internally. In addition, since the respective pipe connection structures for the three pipe insertion ports in the present embodiment are substantially the same, only the connection structure for one pipe insertion port will be described in detail.

The pipe connecting apparatus according to the present embodiment includes a main body 110, a fastening member 120, and a cap nut 130.

The main body 110 has a thread 111 formed on the outer circumferential surface of the insertion port into which the pipe 100 is inserted and a tapered portion 112 formed on the inner circumferential surface of the insertion port. The tapered portion 112 has such a shape that the inner diameter decreases monotonically toward the inner side from the entrance side of the insertion port.

O rings 113 and 114 are provided on both sides of the tapered portion 112 on the inner peripheral surface of the insertion port. At this time, the O-rings 113 and 114 are preferably provided with O-ring grooves. The O-ring 113 is installed on the inner circumferential surface inside the tapered portion 112 of the pipe insertion port and the O-ring 114 is installed on the inclined surface of the tapered portion 112, preferably the position where the inner diameter of the tapered portion 112 is largest do. 9, the O-ring 113 prevents the fluid flowing through the pipe 100 from leaking to the outside through the space between the inner circumferential surface of the main body 110 and the outer circumferential surface of the pipe 100, . The O-ring 114 is for ensuring a sealing force between the main body 110 and the pipe 100 more reliably. The O-ring 114 prevents the fluid from leaking to the outside through the inner circumferential surface of the main body 110 and the outer circumferential surface of the tightening member 120, which will be described later, even if the fluid leaks through the O-ring 113.

The tightening member 120 is made of, for example, spring steel having high strength and high elasticity. The tightening member 120 is provided with a through hole 121 through which a pipe is inserted in a central portion and an inclined surface 122 and a step portion 123 are formed on the outer circumferential surface. The inclined surface 122 corresponds to the tapered portion 112 of the main body 110. The inclined surface 122 is formed such that the outer diameter of the inclined surface 122 gradually increases from the tip portion, And at least two cutout grooves 122a are formed on the inclined surface 122. [

The cutout groove 122a is formed so as to extend along the longitudinal direction of the slanted surface 122. The cutout groove 122a is preferably formed such that the slanted surface 122 is more easily tightened inwardly as the fastening member 120 rotates So as to have a constant inclination angle with respect to the longitudinal direction. The cutout groove 122a is formed to extend as much as possible along the longitudinal direction of the inclined surface 122 so as to more easily and tightly tighten the pipe 100 inserted through the internal through hole 121, When the tightening member 120 is inserted into the insertion port side of the main body 110, it is limited within a range in which the O-ring 114 does not come off. This is so that even if a fluid leaks from the inside through the cutout groove 122a, the leaked fluid can be blocked by the O-ring 114. [

The step 123 prevents the fastening member 120 from being inserted into the insertion port of the main body 110 more than a predetermined distance and the fastening member 120 is inserted into the through hole 132 of the cap nut 130 To the outside. A stopper 124 having a saw tooth shape is formed on the inner peripheral surface of the through hole 121 corresponding to the inclined surface 122 and an O ring 126 is provided on the inner peripheral surface corresponding to the step portion 123. The O-ring 126 is preferably provided with an O-ring groove.

The stopper 124 is provided between the tightening member 120 and the pipe 100 by strongly pressing or crushing the outer peripheral surface of the pipe 100 when the inclined surface 122 is compressed in the inward direction. In order to increase the adhesion strength. The O-ring 126 is provided to more reliably prevent the fluid from leaking to the outside through the space between the inner circumferential surface of the tightening member 120 and the outer circumferential surface of the pipe 100.

The cap nut 130 is for fastening the tightening member 120 to the inside of the insertion port of the main body 110. The cap nut 130 has a threaded portion 131 for fastening the cap nut 130 to the threaded portion 111 of the main body 110 and has a through hole 132 . An O-ring 133 is optionally provided on the inner circumferential surface of the through hole 132. In this case as well, an O-ring groove is preferably formed at the mounting position of the O-ring 133. [ The O-ring 132 is provided to more reliably prevent the fluid from leaking through the cap nut 130 and the pipe 100.

 When the pipe 100 is fastened to the pipe connecting apparatus, the fastening member 120 is disposed inside the cap nut 130 and the tip end of the screw portion 131 of the cap nut 130 is fastened to the main body 110, To the threaded portion 111 of the base plate 111. [ The pipe 100 is inserted through the cap nut 130 and the through holes 132 and 121 of the tightening member 120. The insertion of the pipe 100 is carried out until the tip of the pipe 100 reaches the position of the O-ring 113 of the main body 110. [ Thereafter, the cap nut 130 is tightened to tightly fasten the cap nut 130 to the threaded portion 111 of the main body 110.

When the cap nut 130 is fastened to the threaded portion 111, the inclined surface 122 of the fastening member 120 is slid along the tapered portion 112 of the main body 110 as the cap nut 130 is fastened The inclined surface 122 is pressed in the inward direction, that is, in the direction of the outer peripheral surface of the pipe 100. [

In the conventional configuration shown in Figs. 3 to 5, the tightening member 40 is formed into a wide ring shape, and concave grooves 41 and 42 are formed at both ends. As is well known, the grooves 41 and 42 consider that the inner diameter of the tightening member 40 should be reduced. However, since the fastening member 40 is provided with the recesses 41 and 42 only at both ends thereof, when the internal diameter of the fastening member 40 is reduced by using an external force, the internal diameter of the central portion 40a is structurally maintained, Only the inner diameter of the end portion will be reduced. For this purpose, the tightening member 40 should be warped as a whole. In other words, the conventional fastening member 40 needs to tighten the fastening member 40 in the inward direction by twisting the fastening member 40 in order to reduce its inner diameter, so that a considerably large tightening force is required when the fastening member 40 is compressed. That is, a large force is required to fasten the cap nut 30 to the threaded connection portion 20b. This reduces the working efficiency of the operator and also reduces the coupling force between the tightening member 40 and the pipe.

The inclined surface 122 of the fastening member 120 is inclined in one direction as a whole and the incision groove 122a is formed along the inclined surface 122 as a whole. Therefore, when the inclined surface 122 is compressed in the inward direction, a particularly large external force is not required. In particular, since the cutout groove 122a is formed to have a predetermined inclination angle with respect to the longitudinal direction, the inclined face 122 can be more easily and intensely compressed inwardly as the fastening member 120 rotates. The stopper 124 installed on the inner circumferential surface of the inclined surface 122 strongly presses the outer circumferential surface of the pipe 100 while the inclined surface 122 is compressed in the inward direction so that the tightening member 120 and the pipe 100 are strongly coupled .

Since the O-ring 113 is installed inside the insertion port of the main body 110, the fluid flowing through the pipe 100 leaks to the outside through the coupling surface between the pipe 100 and the main body 110, .

The O-ring 114 is formed in the tapered portion 112 of the main body 110. The tapered portion 112 urges the inclined surface 122 of the fastening member 120 to tighten inward when the cap nut 130 is fastened. Accordingly, when the tapered portion 112 presses the tightening member 120, the O-ring 144 is pressed against the outer circumferential surface of the tightening member 120 as much as possible, so that even if the fluid leaks through the O-ring 113, The leakage of the liquid to the outside through the space between the inner circumferential surface of the main body 110 and the outer circumferential surface of the tightening member 120 is completely blocked.

Since the O rings 126 and 133 are provided on the inner circumferential surface of the tightening member 120 and the inner circumferential surface of the cap nut 130 in the above embodiment, even if the fluid leaks through the O- And the outer circumferential surface of the fastening member 120 and the inner circumferential surface of the cap nut 130 are completely blocked.

10 and 11 are views showing a structure of a pipe connecting apparatus according to a modified embodiment of the first embodiment described above, wherein FIG. 10 is an exploded sectional view of the pipe connecting apparatus, and FIG. 11 is a cross- Sectional view. In the drawings, substantially the same parts as those in the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In this embodiment, a compression ring 140 is provided between the tightening member 120 and the cap nut 130. The fastening member 120 is provided with a first coupling hole 121a for coupling the compression ring 140 with the O-ring 126 in the coupling direction with the cap nut 130, And a second coupling hole 132a for coupling the compression ring 140 to the O-ring 133 in the coupling direction with the tightening member 120 is provided.

The pressing ring 140 is disposed between the fastening member 120 and the cap nut 130 when the fastening member 120 and the cap nut 130 are fastened to the main body 110. [ The compression ring 140 is seated on the first and second coupling holes 121a and 132a of the tightening member 120 and the cap nut 130. [ The compression ring 140 is set to have a width enough to press the O-rings 126 and 133 sufficiently when the fastening member 120 and the cap nut 130 are fastened to the main body 110. When the compression ring 140 presses the O-rings 126 and 133 in the horizontal direction, the O-rings 126 and 133 extend in the vertical direction, i.e., inward direction, and the inner diameter becomes narrow. Therefore, in the present embodiment, the adhesion between the O-rings 126 and 133 and the pipe 100 is greatly increased, so that the airtightness between the inner circumferential surface of the tightening member 120 and the cap nut 130 and the outer circumferential surface of the pipe 100 is further improved .

12 to 16 are views showing a structure of a pipe connecting apparatus according to a second embodiment of the present invention, wherein FIG. 12 is a partially exploded perspective view of the pipe connecting apparatus, FIG. 13 is a exploded sectional view corresponding to FIG. 12, Fig. 15 is a partial cross-sectional perspective view of the pressing member 230 in Fig. 12, and Fig. 16 is a sectional view in a state where a pipe is coupled to the pipe connecting device.

In addition, the present embodiment shows an example in which the present invention is applied to a T-shaped pipe connector having three insertion ports to which the pipe 100 is coupled and which are configured to communicate with each other internally. In addition, since the respective pipe connection structures for the three pipe insertion ports in the present embodiment are substantially the same, only the connection structure for one pipe insertion port will be described in detail.

The pipe connecting apparatus according to the present embodiment includes a main body 210, a tightening member 220, a pressing member 230, and a cap nut 240.

The main body 210 has at least one insertion port 211 for inserting the pipe 100 therein. A first inclined portion 212 for pressing the tightening member 220 to be described later in the inward direction, that is, in the direction of the outer peripheral surface of the pipe 100 is provided on the inner circumferential surface of the insertion port 211, A screw portion 213 for fastening the cap nut 240 is provided on the inner circumferential surface of the?

The tightening member 220 is made of spring steel, for example. As can be more clearly understood from FIG. 14, the fastening member 220 is formed in a ring shape, and the cutout portion 221 is provided at an intermediate portion thereof. The fastening member 220 is easily compressed by the external pressure by the cutout portion 221 and the inside diameter is reduced. On the outer circumferential surface of the tightening member 220, inclined surfaces 223 and 224 inclined inward toward the both ends with respect to the center portion 222 are provided. These inclined surfaces 223 and 224 correspond to the first inclined portion 212 and the second inclined portion 232 to be described later. The inclined surfaces 223 and 224 are in contact with the first and second inclined portions 212 and 232 and the second inclined portion 232 is inserted into the insertion hole 211 along the longitudinal direction of the pipe 100, The first and second inclined portions 212 and 232 are slid in the inward direction, that is, in the direction of the outer peripheral surface of the pipe 100, along the inclined surfaces of the first and second inclined portions 212 and 232. So that the tightening member 220 is compressed in the inward direction.

Further, for example, a serrated stopper 225 is provided on the inner circumferential surface of the tightening member 220. This stopper 225 is formed by tightening the stopper 225 such that the toothed portion of the stopper 225 strongly presses or squeezes the outer circumferential surface of the pipe 100 when the tightening member 220 is compressed in the inward direction as in the first embodiment, And the pipe 100 is increased. In this embodiment, the structure of the stopper 225 is not limited to a specific one, and any structure capable of improving the adhesion between the fastening member 220 and the pipe 100 can be employed in the same manner.

The pressing member 230 is disposed between the tightening member 220 and the cap nut 240. 15, the pressing member 230 is provided with a through hole 231 for inserting the pipe 100 at its central portion, and a second inclined portion 232 at its distal end. The second inclined portion 232 has a shape inclined in the outward direction, that is, in a direction opposite to the outer peripheral surface side of the pipe 100, while facing the inclined surface 224 of the tightening member 220 toward the tip end side.

An O-ring groove 233 is provided on the outer circumferential surface of the pressing member 230, and an O-ring 233a is provided thereon. The O-ring 233a seals the space between the upper surface of the pressing member 230 and the inner circumferential surface of the insertion port 211. At the rear end of the O-ring groove 233, a step 234 is formed. The stepped portion 234 forms a guide groove communicating with the O-ring 233a from the rear end of the pressing member 230 together with the inner peripheral surface of the insertion port 211. [ The second pressing protrusion 243 of the cap nut 240 enters the stepped portion 234 as described later. A first pressing protrusion 235 is formed at the rear end of the inner circumferential surface of the through hole 231. The first pressing protrusion 235 is for pressing the O-ring 244a of the cap nut 240. [

The cap nut 240 is provided with a through hole 241 for inserting the pipe 100 at the central portion thereof and a screw portion 242 for fastening the cap nut 240 to the main body 210 at the outer circumferential surface thereof. The threaded portion 242 is fastened to the threaded portion 213 of the main body 210. A second pressing protrusion 243 for pressing the O-ring 233a of the pressing member 230 is provided at the tip end side of the cap nut 240. [

Further, an O-ring groove 244 is provided on the inner peripheral surface of the through hole 241. The O-ring groove 244 is provided with an O-ring 244a. The O-ring 244a is for sealing between the inner circumferential surface of the through hole 241 and the outer circumferential surface of the pipe 100. [ A step portion 245 is formed at the tip end side of the O-ring groove 244 provided with the O-ring 244a. The stepped portion 245 forms a guide groove communicating with the O-ring 244a from the front end of the cap nut 240 together with the outer peripheral surface of the pipe 100. [ The first pressing projection 235 of the pressing member 230 enters the guide groove.
The first pressing protrusion 235 is formed on the pressing member 230 and the second pressing protrusion 243 is formed on the cap nut 240 so that the pressing member 230 is press- The first pressing protrusion 235 of the pressing member 230 presses the O-ring 244a and the second pressing protrusion 243 of the cap nut 240 Are pressed against the O-rings 233a.

Next, an operation of tightening the pipe 100 using the pipe connecting apparatus according to the present embodiment will be described.

When the pipe 100 is fastened to the pipe connecting device, the cap nut 240, the urging member 230 and the fastening member 220 are sequentially disposed on the outside of the pipe 100, And then the threaded portion 242 of the cap nut 240 is fastened to the threaded portion 213 of the main body 210. In this case, As the cap nut 240 is fastened, the fastening member 220 and the urging member 230 are moved inward of the insertion port 211. When the inclined surface 223 of the tightening member 220 is brought into contact with the first inclined portion 212 of the main body 210 by this movement, the tip portion of the tightening member 220 is inclined inward toward the first inclined portion 212 And the second inclined portion 232 of the urging member 230 is slid in the outward direction along the inclined surface 224 of the fastening member 220 so that the fastening member 220 is urged inward do,

When the tightening member 220 is pressed, the cutting width of the cut-out portion 221 is reduced, and the inner diameter of the tightening member 220 is reduced. As a result, the tightening member 220 applies strong tightening force to the outer peripheral surface of the pipe 100 do. As a result, the teeth of the stopper 225 provided on the inner circumferential surface of the tightening member 220 strongly urge the outer circumferential surface of the pipe 100, and the fastening member 220 and the pipe 100 are tightly coupled.

The second pressing protrusion 243 of the cap nut 240 is pressed against the step portion 234 of the pressing member 230 and the inner circumferential surface of the insertion hole 211 are formed in the state in which the pressing member 230 presses the tightening member 220 The O-ring 233a is compressed in the horizontal direction, and the O-ring 233a is compressed in the horizontal direction, and the thickness of the O-ring 233a in the vertical direction is reduced . The airtightness between the outer circumferential surface of the pressing member 230 and the inner circumferential surface of the insertion port 211 is greatly increased.

The first pressing protrusion 235 of the pressing member 220 presses the O-ring 244a in the horizontal direction along the guide groove formed by the stepped portion 245 of the cap nut 240 and the outer peripheral surface of the pipe 100 The thickness of the O-ring 244a in the vertical direction is increased, and the airtightness between the inner circumferential surface of the cap nut 240 and the outer circumferential surface of the pipe 100 is greatly increased.

When the pipe 100 fastened through the above process is separated from the main body 210, the pressing force applied to the fastening member 220 by rotating the cap nut 240 relative to the main body 210 in the release direction . When the pressing force by the urging member 230 is removed, the fastening member 220 is restored to its original size by sliding the first inclined portion 212 in the direction opposite to the above-described operation by the self- . Therefore, the coupling force between the tightening member 220 and the pipe 100 is released, so that the pipe 100 can be easily removed from the main body 210.

In this embodiment, since the cutout portion 220 is provided in the tightening member 220, the inner diameter of the tightening member 220 can be easily reduced by only a slight pressing force. Therefore, since a large force is not required to fasten the cap nut 240 to the main body 210, the work efficiency of the operator can be improved.

The O-ring 233a provided on the outer circumferential surface of the pressing member 230 and the O-ring 244a provided on the inner circumferential surface of the cap nut 240 are inserted into the pipe (not shown) The airtightness between the main body 210 and the pipe 100 is greatly improved because the thickness of the O-rings 233a and 244a in the vertical direction is maximized.

17 to 19 are views showing a pipe connecting apparatus according to a third embodiment of the present invention, wherein FIG. 17 is a partially exploded perspective view, FIG. 18 is a partial cross-sectional perspective view of the fastening member 320, 19 is a cross-sectional view of the pipe connection device in which the pipe 100 is fastened. In the drawings, substantially the same parts as those in the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In this embodiment, the pipe connecting apparatus is constituted by a main body 210, a tightening member 320, a pressing member 230 and a cap nut 240 as in the above-described embodiment. Here, the main body 210, the pressing member 230, and the cap nut 240 are substantially the same as those in the above-described embodiment.

In this embodiment, the fastening member 320 is formed in a ring shape as in the above-described embodiment, and the cutout portion 321 is provided at an intermediate portion thereof. The tightening member 320 is made of a material having a strong elastic force and a high strength, such as spring steel. On the outer circumferential surface of the fastening member 320, inclined surfaces 323 and 324 inclined inward toward the both ends with respect to the center portion 322 are provided.

On the other hand, in the present embodiment, grooves 325 are formed along the circumferential direction on the inner circumferential surface of the tightening member 320. On both sides of the groove 325, a stopper 326 is formed along the arc direction. In this embodiment, the stopper 326 has a cross section, for example, in the form of a blade.

19, when the pipe 100 is inserted into the insertion port 211 of the main body 210 and then the cap nut 240 is fastened to the main body 210, the fastening member 320 is moved inward in the same manner as in the above- A large compressive force is applied. By this compressive force, the tightening member 320 is pressed in the inward direction, and the stopper 326 strongly presses or sags the outer circumferential surface of the pipe 100, so that the tightening member 320 and the pipe 100 are tightly coupled. In particular, a central portion of the tightening member 320 is provided with a groove 325 which opens toward the inner peripheral surface. When the tightening member 320 is pressed inward, the groove 325 is subjected to a force in the direction of increasing the width, that is, in the direction of expansion. Conversely, the groove 325 is opposite to the direction of extension, Thereby providing an elastic force in the direction of the outer peripheral surface.

Therefore, in this embodiment, the tightening member 320 is pressed inwardly, and such a pressing force is always maintained in a high state by the elastic force of the groove 325, so that the tightening force of the tightening member 320 with respect to the pipe 100 is very high It will be exerted highly.

In addition, in this embodiment, the stopper 326 provided in the tightening member 320 is not limited to a specific configuration and can be modified in various ways. For example, FIG. 20 is a cross-sectional view showing another modification of the fastening member 320. A groove 325 is formed in the direction of the inner circumferential surface of the tightening member 330 and stoppers 336 are provided on both sides of the groove 325 along the circumferential direction. On the other hand, in the embodiment of Fig. 18, the stopper 326 is constituted by a single blade, while in this modification, the stopper 326 is constituted by a double blade. Since the other parts are the same as those of the above-described embodiment, the same reference numerals are given to the same parts as those of the above embodiment, and a detailed description thereof will be omitted.

21 to 24 are views showing a pipe connecting apparatus according to a fourth embodiment of the present invention, wherein FIG. 21 is a partially sectional exploded perspective view of the pipe connecting apparatus, FIG. 22 is a partial cross- 23 is a plan view of the fastening member 420 in Fig. 21, and Fig. 24 is a sectional view when the pipe 100 is fastened to the pipe connecting device. In the drawings, substantially the same parts as those in the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In this embodiment, the tightening member and the pressing member are integrally formed in the above-described embodiment. In this embodiment, the pipe connecting apparatus is constituted by a main body 210, a tightening member 420, and a cap nut 240.

The fastening member 420 is provided with a through hole 421 for inserting the pipe 100 in the central portion thereof. In addition, a slope 422 is provided at the distal end portion, and a groove 423 is formed in the inner circumferential surface in a circular arc direction. At least one cutout groove 422a is formed in the distal end portion. This cutout groove 422a is formed so as to reach the groove 423 starting from the inclined surface 422. [ The incision groove 422a is provided so that the inclined surface 422 can be more easily compressed in the direction of the groove 423.

In this embodiment, a step 215 is provided inside the insertion port 211 of the main body 210 instead of the first inclined portion 212 in the second and third embodiments.

An O-ring groove 424 is provided on the outer circumferential surface of the fastening member 420 in the same manner as the pressing member 230 in the above embodiment, and an O-ring 424a is provided thereon. The O-ring 424a is for sealing between the outer peripheral surface of the tightening member 430 and the inner peripheral surface of the main body 210. [ A stepped portion 425 is formed at the rear end of the O-ring groove 424, and a third press protrusion 426 is formed at the rear end. The third pressing protrusion 426 is for pressing the O-ring 244a of the cap nut 240 in the same manner as the first pressing protrusion 235 described above.

The pressing force is applied to the inclined surface 422 of the tightening member 420 when the cap nut 240 is fastened to the main body 210 so that a certain amount of pressure is applied to the fastening member 420 in the horizontal direction, And is concentrated at the distal end. The groove 423 of the tightening member 420 is compressed and an external force is applied in a direction in which the inclination angle of the inclined surface 422 is increased. The outer circumferential surface of the fastening member 420 is supported by the inner circumferential surface of the main body 210 so that the length of the slant surface 422 can be increased by increasing the inclination angle of the slant surface 422. [ The distal end portion pushes the outer circumferential surface of the pipe 100, thereby digging the outer circumferential surface. As a result, the coupling force between the tightening member 420 and the pipe 100 is increased to prevent the pipe 100 from being easily separated from the main body 210. The other operations are the same as those in the above embodiment.

As described above, according to the present invention, it is possible to easily engage and disengage the pipe with respect to the main body of the pipe connecting device, to reliably prevent the pipe coupled to the main body from being disengaged, It is possible to realize a pipe connection device which can reliably prevent the fluid from leaking.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical spirit of the present invention.

110, 210: main body, 120, 220, 320, 420: fastening member,
130, 240: cap nut, 230: pressing member.

Claims (22)

delete delete delete delete delete delete delete A pipe connecting device for connecting a pipe for flowing fluid or for connecting a pipe and a pipe,
A main body having an insertion port into which a pipe is inserted,
A fastening member which is formed in a ring shape and has a cutout at an intermediate portion thereof and is disposed between an inner circumferential surface of the insertion port and an outer circumferential surface of the pipe,
A pressing member provided with a first through hole into which a pipe is inserted in the center portion and disposed between the tightening member and the cap nut,
And a cap nut which is fastened to the insertion port of the main body and has a second through hole into which a pipe is inserted at a central portion thereof,
The main body has a first inclined portion corresponding to the first inclined surface of the fastening member on the inner circumferential surface of the insertion port,
The tightening member has first and second inclined surfaces inclined inwardly toward both ends with respect to the center on the outer circumferential surface,
Wherein the pressing member includes a second inclined portion at the tip end portion corresponding to the second inclined surface. 9. The method of claim 8,
And a first stopper is formed on an inner peripheral surface of the tightening member. 9. The method of claim 8,
And a groove is further formed along an arc direction on an inner circumferential surface of the tightening member. 11. The method of claim 10,
And a second stopper is provided on both side surfaces of the groove along a circular arc. 12. The method of claim 11,
And the second stopper is formed in a blade shape. 9. The method of claim 8,
And a first O-ring is provided on an outer circumferential surface of the pressing member. 9. The method of claim 8,
And a second O-ring is provided on an inner circumferential surface of the second through hole. 14. The method of claim 13,
Wherein an O-ring groove is formed in an outer circumferential surface of the pressing member, a first O-ring is provided in the O-ring groove, a first step is formed in a rear end of the O-
And a second pressing protrusion for pressing the first O-ring is additionally provided at a tip end of the cap nut through a first step portion of the pressing member. 15. The method of claim 14,
Wherein a through hole is formed in a central portion of the cap nut, an O-ring groove is formed in an inner circumferential surface of the through hole, a second O-ring is provided in the O-ring groove, Further,
And a first pressing protrusion for pressing the second O-ring through the second step portion is further provided at a rear end of the pressing member. delete delete delete delete delete delete

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