CN211145655U

CN211145655U - Pipe joint device

Info

Publication number: CN211145655U
Application number: CN201922020648.6U
Authority: CN
Inventors: 朴海申; 朴源哲; 尹汝俊
Original assignee: Nordis
Current assignee: Nordis
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-07-31
Anticipated expiration: 2029-11-21
Also published as: KR102436969B1; KR20210062554A

Abstract

The utility model relates to a coupling device. The utility model discloses can include: a main body, wherein one or more than one short joints which are connected and transfer fluid are convexly formed on the main body, and male threads used for connecting nuts are formed on the outer side of the short joints; a nut that is screwed to the male thread of the body by a female thread, and that fastens the nipple and fixes the outer peripheral surface of the pipe by pressing; the connecting pipe is pressed between the pipe and the short section in a mode that the pipe is inserted into the short section, and the inserting bulge protruding corresponding to the size of the inserting groove formed in the short section realizes interference fit; an anti-dropping groove is formed on the outer peripheral surface of the connecting pipe contacting with one surface of the pipe, and the anti-dropping groove accommodates the protruding part of the pipe due to press-in and prevents the pipe from dropping.

Description

Pipe joint device

Technical Field

The invention relates to a pipe joint device for connecting pipes for transferring fluid, which can improve the air tightness of the pipe joint and predict the fastening degree of a nut for fixing the pipes so as to prevent the damage caused by excessive assembly of pipe connection.

Background

In general, a pipe joint is used in various industrial fields to connect one end of a pipe in a piping form required for transferring a fluid (liquid or gas) to another member, and the other member to which the pipe is connected may be one end of another pipe or a target to which the fluid is transferred by pipe connection such as a valve or a cylinder.

For example, if examined in korean patent laid-open publication No. 10-1612064, the present invention relates to a pipe connector for connecting a pipe, the pipe connector comprising a nut portion, a rear end ferrule, a front end ferrule, and a main body portion, the nut portion, the rear end ferrule, and the front end ferrule being fitted to the pipe, the nut portion being screwed to the main body portion in a state of being inserted into a groove of the main body portion at an end of the pipe, the pipe connector further comprising: a guide fixture interposed between a distal end of the pipe and a receiving groove of the main body, the guide fixture positioning the rear end ferrule and the front end ferrule on an outer peripheral surface of the pipe by pressing when the nut portion is screwed to the main body; and a sealing device which is installed so as to be interposed between the end of the pipe and the notch of the main body in a state where the guide fixing member is separated between the end of the pipe and the notch of the main body after the rear end ferrule and the front end ferrule are positioned in the pipe, thereby improving a sealing force; the nut portion is formed with a leak hole penetrating the outside to communicate the inside with the outside.

However, the conventional art has revealed a technical problem to be improved.

In view of this, in the conventional art, a nut for fixing a pipe to a pipe joint is used to fix the pipe to a body to be assembled by screw fastening, and the nut cannot predict an appropriate fastening degree of the nut in a process of direct assembly by an operator, and depends on the operator's feeling, so that if the nut is insufficiently fastened, it causes a fluid to flow out, and if the nut is excessively assembled, the pipe joint is broken, and therefore, there is a problem in that a gap gauge for measuring the appropriate fastening degree of the nut must be used, and thus, an operation speed is significantly reduced, and there is an inconvenience in preparing the gap gauge.

In addition, in the conventional pipe joint, a nut for fixing a pipe is assembled to a body of an object to be assembled by a simple screw structure, and there is no structure capable of preventing the nut from loosening.

[ Prior art documents ]

[ patent document ]

Korean granted patent publication No. 10-1612064

Disclosure of Invention

Problems to be solved by the invention

The present invention is to solve the conventional problems and to provide a pipe joint device capable of improving airtightness in a pipe joining state.

Further, the present invention provides a pipe joint device that can prevent fluid from flowing out due to insufficient tightening of a nut and prevent damage of a pipe joint due to excessive tightening of the nut, so that it can improve work speed and eliminate inconvenience of preparing a gap gauge.

Further, the present invention provides a pipe joint device capable of preventing a nut fixing a pipe from being loosened by itself due to an external force such as vibration, and improving a coupling force of the nut.

Means for solving the problems

According to one embodiment of the invention, the invention may comprise: the pipe joint comprises a main body, a pipe joint, a nut and a pipe joint, wherein one or more than one short joints for connecting pipes and transferring fluid are convexly formed on the main body, and male threads for connecting nuts are formed on the outer side of the short joints; a nut that is screwed to the male thread of the body by a female thread, and that fastens the nipple and fixes the outer peripheral surface of the pipe by pressing; the connecting pipe is pressed between the pipe and the short section in a mode that the pipe is inserted into the short section, and the inserting bulge protruding corresponding to the size of the inserting groove formed in the short section realizes interference fit; an anti-dropping groove is formed on the outer peripheral surface of the connecting pipe contacting with one surface of the pipe, and the anti-dropping groove accommodates the protruding part of the pipe due to press-in and prevents the pipe from dropping.

The anti-dropping groove may be formed in plurality at intervals in a circumferential direction on an outer circumferential surface of the connection pipe.

The connection pipe may have: a first inclined surface having a diameter enlarged in a direction in which the pipe is inserted; a variable curved surface extending in parallel at an end of the first inclined surface; and a second inclined surface having a diameter that decreases in a direction in which the pipe is inserted at an end of the modified surface; the anti-falling groove is formed along the second inclined surface from a point where the modified surface ends.

In the nut, a first projection may be formed to project from an end portion facing the nipple side,

the nut may further include a joint member provided between the body and the nut, and a second protrusion is protrudingly formed at a position corresponding to the first protrusion, so that a proper fastening degree of the nut can be predicted by using a frictional sound generated when the first protrusion contacts the second protrusion during the assembly of the nut.

The joint may further include an elastic portion having a partitioning hole formed to penetrate the second protrusion side and elastically supporting the second protrusion while spatially partitioning the second protrusion, wherein the elastic portion is provided in a band-shaped section in a portion where the second protrusion is formed to protrude, and when the first protrusion and the second protrusion are brought into contact with each other, the second protrusion continuously collides with the first protrusion by an action of elastic force to generate a friction sound every time the nut is spirally rotated, due to the elastic portion, the second protrusion moves by the elastic force.

The joint may further include a hooking protrusion provided at a side of the support portion supporting the end of the nut, and having a first catching ridge formed to protrude at a position corresponding to a first hooking ridge provided at an outer circumference of a coupling side of the nut, wherein if the nut is assembled to the body, the first catching ridge is forcibly fixed while being hooked to the first hooking ridge so that the nut is not loosened.

The joint may further include a coupling portion which is inserted between the body and the nut, corresponds to a hooking groove formed in the body of the insertion coupling portion, and has a second locking rib protruding inward, and the joint may be fixed so as not to be separated from the body by an engagement of the second locking rib with the hooking groove.

Effects of the invention

According to the present invention, the airtightness of the tube in the joined state can be improved.

In addition, according to the present invention, it is possible to prevent fluid from flowing out due to insufficient tightening of the nut and to prevent the pipe joint from being damaged due to excessive tightening of the nut, thereby improving the working speed and eliminating the inconvenience of preparing the gap gauge.

Further, according to the present invention, it is possible to prevent the nut for fixing the pipe from being loosened by itself due to an external force such as vibration, and to improve the coupling force of the nut.

Drawings

Fig. 1 is a perspective view of a pipe joint device according to a first embodiment of the present invention.

Fig. 2 is a sectional view of a pipe joint device according to a first embodiment of the present invention.

Fig. 3 is an exploded perspective view of a pipe joint device according to a first embodiment of the present invention.

Fig. 4 is a perspective view of a connection pipe of a pipe joint device according to a second embodiment of the present invention.

Fig. 5 is a sectional view of a coupling pipe of a pipe joint device according to a second embodiment of the present invention.

Detailed Description

The features of the pipe joint device of the present invention can be understood from the embodiments described in detail below with reference to the accompanying drawings.

On the other hand, in describing the embodiments, detailed descriptions of components which are known and widely used in the technical fields to which the present invention belongs or which do not belong are omitted in order to more clearly convey the gist of the present invention while unnecessary descriptions are omitted.

Fig. 1 to 4 are diagrams illustrating a pipe joint device according to each embodiment of the present invention.

If such a pipe joint device 1 is examined roughly, it comprises: a main body 100, wherein one or more short joints 120 are convexly formed on the main body 100; a nut 200 that presses the outer circumferential surface of the fixed pipe 10 while fastening the nipple 120; a joint 300, said joint 300 being such as to predict a moderate tightening degree of the nut 200.

The basic configuration of the present invention is the configuration of each part of the pipe joint device according to the first embodiment, and the following description will be made with reference to fig. 1 to 3. Fig. 1 is a perspective view of a pipe joint device, fig. 2 is a sectional view of the pipe joint device, and fig. 3 is an exploded perspective view of the pipe joint device.

First, the main body 100 is formed by projecting one or more nipples 120 to which the pipes 10 are connected and transfer fluid, and male threads 122 for coupling nuts 200 are formed outside the nipples 120, and the main body 100 is composed of a short pipe body 110a or a valve body 110b to which one or more pipes 10 are connected.

The main body 100 of the basic embodiment of the present invention is composed of a short tube body 110a, a valve body 110b, a short piece 120, and a connection tube 130.

For example, the main body 100 further includes selectively forming one of a short pipe body 110a or a valve body 110b, wherein the short pipe body 110a connects more than one pipe 10 to each other to perform a pipe connection, and the valve body 110b connects more than one pipe 10 to supply a fluid to perform a valve function.

The short pipe main body 110a has a passage 111 for transferring fluid formed therethrough, and the passage 111 is connected to a pipe line 121 of a short joint 120, which will be described later, so that the fluid of the pipe 10 connected by the short joint 120 moves through the passage 111 of the short pipe main body 110 a.

At this time, the short tube body 110a serves to switch the moving direction of the fluid or to extend the tube 10 for transferring the fluid.

The valve body 110b is formed with an inlet 112a through which a fluid flows into the valve body, and an outlet 112b through which the fluid flowing into the inlet 112a is discharged, and the inlet 112a and the outlet 112b are connected to a pipe line 121 of a nipple 120, which will be described later, so that the fluid of the pipe 10 connected to the nipple 120 is discharged to the outlet 112b through the inlet 112a of the valve body 110b and moves.

In this case, the valve body 110b has a valve structure, such as a shut-off valve, a gate valve, a butterfly valve, or a diaphragm valve, at an upper portion thereof in order to control the flow of the fluid moving from the inlet 112a to the outlet 112 b.

The main body 100 further includes a nipple 120, the nipple 120 is selectively formed to protrude from one side of the nipple body 110a or the valve body 110b, the pipe 10 is connected to the inside of the nipple 120, and a male thread 122 for coupling the nut 200 is formed on the outside of the nipple 120.

The nipple 120 is integrally formed to protrude in a hollow pipe shape at a side of the main body 100, and a pipe line 121 is formed to penetrate the inner connection pipe 10 so as to allow fluid to flow, and the pipe line 121 is connected to the passage 111 of the short pipe body 110a or the inlet 112a and the outlet 112b of the valve body 110 b.

An insertion groove 123 is formed in a ring-shaped groove on the boundary portion side of the passage 111 or the inlet 112a and the outlet 112b inside the pipe passage 121, and a first inclined surface 124 is formed in an expanded pipe shape on the inner outer end of the pipe passage 121.

In this case, the nipple 120 has a male thread 122 formed on the outer periphery thereof, and preferably, the male thread 122 has a trapezoidal thread formed at an angle of 29 ° to 30 °.

If the male thread is formed as a trapezoidal thread, a strong force can be transmitted in the axial direction of the assembled portion of the nut 200 and the sub 120, the force for fastening the nut 200 can be secured to the maximum, and the nut 200 can be prevented from being loosened by an external force such as vibration by strong fastening.

The nipple 120 includes a receiving portion 125 for receiving a later-described coupling member 300 in an insertion coupling manner on an outer circumference of a boundary side of the nipple body 110a or the valve body 110b, and at least one catching groove 125a is formed at an edge of the receiving portion 125 at a position corresponding to the second locking ridge 311 of the coupling member 300 at equal intervals.

At this time, the seating portion 125 is formed at a position of the nut 200 at a moderate fastening degree, so that the fastening degree prediction can be performed using the joint 300.

The body 100 further includes a connection pipe 130 which is detachably assembled to the inner side of the nipple 120 by being inserted into and coupled to an insertion groove 123 formed at the inner side of the pipe 121 by an insertion protrusion 131, and connects the pipe 10 to the nipple 120 while inserting the pipe 10 into a connection part 132 protruding to the other side of the assembled part.

The connection pipe 130 is formed in a hollow pipe shape to such an extent that interference fit can be induced with respect to the diameter of the pipe 121, and an insertion protrusion 131 corresponding to the size of the insertion groove 123 and protruding in a ring shape is provided at one end of the connection pipe 130, so that the insertion protrusion 131 is combined with the insertion groove 123 in an interference fit shape and maintains air-tightness.

A second inclined surface 133 corresponding to the nipple inclined surface 124 is formed on the outer circumferential surface in the other direction of the insertion protrusion 131 of the connection pipe 130 so that the pipe 10 can be pressed in a surface contact manner to the nipple inclined surface 124 in an inclined form expanded to the inner and outer ends of the pipeline 121, and the second inclined surface 133 is expanded to be larger than the inner diameter of the pipe 10 to induce interference fit to the pipe 10.

The connection part 132 is formed to have a boundary shape with the insertion protrusion 131 such that the tube 10 is inserted between the insertion protrusion 131 and the connection part 132 without being inserted and fixed.

At this time, the connection pipe 130 is initially separated from the body 100, and in a state where one end of the pipe 10 is coupled and fixed to the connection part 132 of the connection pipe 130 by interference fit, the connection pipe 130 in the separated state is inserted into the pipe line 121, and the connection pipe 130 is connected to the nipple 120 of the body 100 by an interference fit structure of the insertion groove 123 and the insertion protrusion 131.

Therefore, in the present invention, if the pipe 10 is connected to the sub 120 by the connection pipe 130, the side wall of the pipe 10 is brought into close contact with the sub inclined surface 124 in a surface contact manner by the second inclined surface 133 to efficiently maintain airtightness of the pipe 10, and the fixing property by the pressing force of the nut 200 described later is further improved, and the connection of the pipe 10 can be easily performed by the connection pipe 130 detachably assembled to the sub 120 of the body 100.

The nut 200 is screwed and fixed to the male screw 122 of the body 100 by the female screw 210, thereby tightening the nipple 120 and pressing and fixing the outer peripheral surface of the pipe 10, and a first protrusion 231 is formed to protrude from an end portion facing the nipple 120 side, and presses and fixes the outer peripheral surface of the pipe 10 connected to the nipple 120 of the body 100 at an angular position.

The nut 200 according to the basic embodiment of the present invention is composed of a female thread 210, a pressing protrusion 220, a first hooking ridge 230, and a second hooking ridge 240.

For example, the nut 200 further includes the female screw 210 having a through-hole formed therein to be screwed to the male screw 122 of the body 100.

The female screw 210 is formed with a screw thread inside one side of the nut 200 coupled to the body 100, and the female screw 210 is configured to correspond to the male screw 122.

In this case, the female screw 210 corresponds to the male screw 122, and is preferably formed as a trapezoidal screw having a screw angle of 29 ° to 30 °.

In addition, the nut 200 further includes a pressurizing protrusion 220, and the pressurizing protrusion 220 protrudes toward the other side of the female screw 210 to press the outer circumferential side of the pipe 10, thereby performing a fixing function.

The pressurizing protrusion 220 is formed to protrude inward at the other side of the female screw 210 by a length such that a pressure of a degree capable of stably fixing the pipe 10 acts.

At this time, the pressure projection 220 presses the outer circumference of the pipe 10 connected to the nipple 120 by the fastening force of the nut 200 and fixes the pipe 10 in the process where the nut 200 is coupled to the female thread 210 of the body 100 by the male thread 122.

In addition, the nut 200 further includes: a first hanging ridge 230, the first hanging ridge 230 being formed to protrude from the outer circumference connected to the main body 100; and a second hanging ridge 240, the second hanging ridge 240 being formed to protrude from the first hanging ridge 230 at an arbitrary interval.

The first hooking ridge 230 is integrally formed to protrude outside a side end of the nut 200 coupled to the body 100 in a manner of having a locking ridge, and induces a hooking protrusion 340 of a later-described engaging member 300 to be hooked to the first hooking ridge 230 at a point where the nut 200 is appropriately fastened, thereby providing a forced fixing function to the nut 200.

The second hooking ridge 240 is formed to protrude at an arbitrary interval at a position adjacent to the first hooking ridge 230 on the outer circumference of the nut 200 so as to have a locking ridge, and when the nut 200 is coupled to the body 100 and the hooking protrusion 340 of the later-described fastener 300 is hooked to the first hooking ridge 230, if the nut 200 is excessively assembled, the hooking protrusion 340 of the fastener 300 is hooked to the locking ridge of the second hooking ridge 240, so that the excessive assembly cannot be performed, and in this case, if the nut is forcibly fastened, it is recognized that the shape of the hooking protrusion 340 is deformed over the second hooking ridge 240, and a function of preventing the excessive assembly is performed.

A plurality of first protrusions 231 are formed to protrude at equal intervals on the coupling side surface of the nut 200.

Also, the joint member 300 is provided between the body 100 and the nut 200, and a second protrusion 322 is protrudingly formed at a position corresponding to the first protrusion 231, and a proper fastening degree of the nut 200 can be predicted by using a frictional sound generated when the first protrusion 231 contacts the second protrusion 322 during the assembly of the nut 200.

The joint 300 according to the basic embodiment of the present invention is composed of a coupling portion 310, a support portion 320, an elastic portion 330, and a hooking protrusion portion 340.

For example, the joint 300 further includes a coupling portion 310, the coupling portion 310 is inserted and coupled between the body 100 and the nut 200, a second locking rib 311 is formed to protrude inward corresponding to the hooking groove 125a formed in the body 100 at the coupling portion, and the joint 300 is fixed so as not to be separated from the body 100 by the engagement of the second locking rib 311 with the hooking groove 125 a.

The coupling portion 310 is formed of a ring-shaped plate having a diameter corresponding to the diameter of the receiving portion 125 provided at the boundary of the sub 120 of the body 100, and is attached to the receiving portion 125 by insertion coupling, and a second locking rib 311 is formed at a position corresponding to the hooking groove 125a formed in the receiving portion 125 inside the coupling portion 310 in a protruding manner, and the second locking rib 311 has a locking rib in a direction opposite to the coupling direction of the coupling member 300.

The joint 300 further includes a support portion 320, and the support portion 320 is formed in an expanded plate on one side of the coupling portion 310 and supports the coupling-side end portion of the nut 200.

The support portion 320 is formed as a ring-shaped plate extending and expanding integrally from one side of the coupling portion 310, and the side portion of the support portion 320 supports the coupling-side end portion of the nut 200 so that the nut 200 is fixed in a properly fastened state without being fastened.

One or more second protrusions 322 are formed at positions corresponding to the first protrusions 231 of the nut 200 on the side surface of the support part 320 supporting the nut 200, and it is preferable that 2 second protrusions 322 are provided at equal intervals on the side surface of the support part 320 as the second protrusions 322.

The fastener 300 further includes an elastic portion 330, in which a partition hole 321 is formed to penetrate the elastic portion 330 toward the second protrusion 322, and the elastic portion is provided in a band-shaped section at a portion where the second protrusion 322 is protruded, and elastically supports the second protrusion 322 while spatially partitioning it.

The elastic part 330 penetrates a part of the supporting part 320 on the side where the second protrusion 322 is formed through the partition hole 321, and the rest part of the supporting part 320 on which the second protrusion 322 is formed is retained in a plate shape, and the section thus provided is the elastic part 330.

At this time, the elastic part 330 has the same material characteristics as the synthetic resin, and thus performs an elastic force.

In the process of assembling the nut 200 to the body 100, the engaging member 300 is coupled to the nut 200 at a position where the body 100 is appropriately fastened, and the second protrusion 322 is moved by an elastic force when the first protrusion 231 is brought into contact with the second protrusion 322 by the elastic portion 330 of the engaging member 300, so that the second protrusion 322 continuously collides with the first protrusion 231 every time the nut 200 is spirally rotated to generate a frictional sound, thereby allowing a user to recognize that the nut 200 is appropriately fastened by a voice.

Therefore, in the present invention, the proper fastening degree of the nut 200 is predicted by using the frictional sound generated from the joint 300 during the assembly of the nut 200 to the body 100, thereby preventing the fluid from flowing out due to the insufficient fastening of the nut 200 and the breakage of the pipe joint due to the excessive fastening of the nut 200, and eliminating the inconvenience of preparing a clearance gauge by increasing the working speed because it is unnecessary to use a clearance gauge or the like as a separate tool for measuring the fastening degree of the nut 200.

The joint 300 further includes a hooking protrusion 340, the hooking protrusion 340 is provided at a side of the support part 320 supporting an end of the nut 200, a first catching rib 341 is protrudingly formed at a position corresponding to the first hooking rib 230 provided at an outer circumference of a coupling side of the nut 200, and if the nut 200 is assembled to the body 100, the first catching rib 341 is forcibly fixed while being hooked to the first hooking rib 230 so that the nut 200 is not loosened.

The hooking protrusion 340 is formed in a single body plate having a first rib 341 protruding inward on a side surface of the support portion 320 supporting the nut 200, the first rib 341 is formed at a position corresponding to a position where the first hooking rib 230 of the nut 200 can be hooked, and the hooking protrusion 340 is formed at a position where the nut 200 is appropriately fastened.

In this case, the first locking rib 341 has a locking rib on the coupling direction side of the nut 200 and an inclined surface on the other end thereof so as to easily get over the first hanging rib 230 to be hung.

Therefore, in the present invention, if the nut 200 is coupled to the body 100 at a proper fastening degree in the process of coupling the nut 200 to the body 100, the hooking protrusion 340 of the joint 300 is hooked to the first hooking ridge 230 of the nut 200 and provides a fixing force, and thus the nut 200 screwed to the body 100 can be forcibly fixed, and the nut 200 of the fixing pipe 10 is prevented from being loosened by itself due to an external force such as vibration, thereby improving the coupling force of the nut 200.

On the other hand, as still another configuration of the present invention, the configuration of each part of the pipe joint device according to the second embodiment will be specifically described with reference to fig. 4 and 5. Fig. 4 is a perspective view of a coupling pipe in the pipe joint device, and fig. 5 is a sectional view of the coupling pipe.

According to the second embodiment, in the pipe joint device 1 configured as described above, the connection pipe 130 has: a first inclined surface 135, a diameter of the first inclined surface 135 being enlarged in a direction in which the pipe 10 is inserted; a modified surface 134, the modified surface 134 extending in parallel at an end of the first inclined surface 135; and a second inclined surface 133, a diameter of the second inclined surface 133 being reduced in a direction in which the pipe 10 is inserted at an end of the modified surface 134. Therefore, the front end of the pipe 10 passes over the first inclined surface 135, and is contacted along the second inclined surface 133 and can be stably fixed.

On the other hand, the second inclined surface 133 is formed with an anti-drop groove 136, and the anti-drop groove 136 may be formed along the second inclined surface 133 from a point where the modified surface 134 ends. The anti-dropping groove 136 is formed in this portion to accommodate a portion protruding by the press-fitting of the tube 10 at a position where the direction of the curved surface 134 is changed at the tip end portion of the tube 10, so as to prevent the tube 10 from being detached. When the distal end portion of the pipe 10 is inserted in a hot-worked state, the contact surface is pressed by the coupling force. At this time, if the portion of the pipe 10 protruding by press-fitting is accommodated in the drop-off preventing groove 136, the pipe 10 can be prevented from dropping off in the opposite direction.

The anti-dropping grooves 136 may be formed in a plurality at intervals in the circumferential direction on the outer circumferential surface of the connection pipe 130. If the anti-dropping grooves 136 are formed in a band shape along the circumferential direction, there is a problem that the pressed portion of the tube 10 is excessively protruded to cause a positional deviation, but if a plurality of grooves are formed at intervals as described above, the position of the tube 10 is not deviated and only a part of the grooves is protruded, so that the tube 10 can be effectively prevented from dropping. The number, depth, length, etc. of the anti-drop grooves 136 may be variously formed according to the design specification of the pipe joint device.

The anti-drop groove 136 may also perform a desired hooking function for removal from the mold. The anti-falling groove 136 is formed on the connection pipe 130 in the process of injection molding the outer circumferential edge into the circular groove at an arbitrary position of the second inclined surface 133, and after the injection molding of the connection pipe 130 is completed, another taking-out member for taking out the injection molded article is inserted into the anti-falling groove 136, and the connection pipe 130 is taken out from the mold, so that the separation of the mold from the connection pipe 130 is simple and convenient, and the anti-falling groove 136 enables the connection pipe 130 to be manufactured by the injection molding device, thereby realizing an automated process and being suitable for mass production.

While the present invention has been described with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. A pipe joint device, comprising:

the pipe joint comprises a main body, a pipe joint, a nut and a pipe joint, wherein one or more than one short joints for connecting pipes and transferring fluid are convexly formed on the main body, and male threads for connecting nuts are formed on the outer side of the short joints;

a nut that is screwed to the male thread of the body by a female thread, and that fastens the nipple and fixes the outer peripheral surface of the pipe by pressing; and

the connecting pipe is pressed between the pipe and the short section in a mode that the pipe is inserted into the short section, and the inserting bulge protruding corresponding to the size of an inserting groove formed in the short section realizes interference fit;

an anti-dropping groove is formed on the outer peripheral surface of the connecting pipe contacting with one surface of the pipe, and the anti-dropping groove accommodates the protruding part of the pipe due to press-in and prevents the pipe from dropping.

2. The pipe joint device according to claim 1,

the anti-dropping grooves are formed in the outer circumferential surface of the connecting pipe at intervals along the circumferential direction.

3. The pipe joint device according to claim 1,

the outer peripheral surface of the connection pipe is provided with:

a first inclined surface having a diameter enlarged in a direction in which the pipe is inserted;

a variable curved surface extending in parallel at an end of the first inclined surface; and

a second inclined surface having a diameter that decreases in a direction in which the pipe is inserted at an end of the modified surface;

the anti-falling groove is formed along the second inclined surface from a point where the modified surface ends.

4. The pipe joint device according to claim 1,

in the nut, a first protrusion is formed at an end portion facing the nipple side in a protruding manner,

the nut further comprises a joint, wherein the joint is arranged between the main body and the nut, and a second bulge is formed in a protruding mode at a position corresponding to the first bulge, so that the proper fastening degree of the nut can be predicted by utilizing friction sound generated when the first bulge contacts the second bulge in the nut assembling process.

5. The pipe joint device according to claim 4,

the joint further includes an elastic portion having a partitioning hole formed through the elastic portion toward the second projection, and elastically supporting the second projection in a spatially partitioned manner, the elastic portion being provided in a band-shaped section in a portion where the second projection is formed in a protruding manner,

when the first projection and the second projection are in contact with each other by the elastic portion, the second projection moves by the elastic force, and the second projection continuously collides with the first projection every time the nut is rotated spirally, thereby generating a frictional sound.

6. The pipe joint device according to claim 4,

the joint further includes a hooking protrusion provided at a side of the support portion supporting the end of the nut, and a first locking ridge formed to protrude at a position corresponding to a first hooking ridge provided at an outer circumference of a coupling side of the nut, wherein if the nut is assembled to the body, the first locking ridge is forcibly fixed while being hooked to the first hooking ridge so that the nut is not loosened.

7. The pipe joint device according to claim 4,

the joint member further includes a coupling portion which is inserted between the body and the nut, corresponds to a hooking groove formed in the body inserted into the coupling portion, and has a second locking rib formed to protrude inward, and the joint member is fixed so as not to be separated from the body by an effect of the second locking rib being hooked in the hooking groove.