KR20190018858A - Telescopic type connecting structure for pipe - Google Patents

Abstract

The present invention relates to a flexible pipe connection structure capable of preventing a pipe from being deformed and preventing a bending deformation. According to the present invention, the flexible pipe connection structure includes: a connection pipe including a connection part having a hollow, and left and right expansion pipe parts extending from both ends of the connection part; a stepped part including a fitting groove formed in an inner peripheral surface of the left and right expansion pipe parts and the connection part, an extension surface extending horizontally from an inner end of the fitting groove to an inner side of the connection part, and an inclined surface inclined from an end of the extension surface to an inner peripheral surface of the connection part; a separation preventing ring including a seating surface, a plurality of fitting pieces, and a plurality of insertion pieces; a packing material fitted in the left and right expansion pipe parts; and a cap sleeve detachably fitted to the left and right expansion pipe parts and having an end making contact with the packing material.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a telescopic type pipe connection structure,

In particular, the present invention relates to a pipe structure capable of expanding and contracting, and more particularly, it relates to a structure for connecting a pipe for fire detection of an air intake type, which improves the structure of a connection pipe and a departure prevention ring to prevent detachment of the pipe after entering the pipe, It is possible to prevent the deformation of the separation preventing ring caused in the pressing process and to prevent the deformation of the pipe caused by heat by suppressing the deformation of the pipe caused by the heat, It is possible to prevent the insertion member from being deformed toward the inner circumferential surface of the hollow pipe in the process of entering the pipe into the pipe portion so that the insertion member can be well inserted into the outer peripheral surface of the pipe during the pipe drawing process, As long as a sufficient length penetrates into the pipe, The present invention relates to a flexible pipe connection structure having improved structure.

Generally, pipes are widely used for transporting gases such as fluids or gases such as water or oil. Such pipes are manufactured and sold to a certain size (length) due to transportation and handling restrictions.

Therefore, when constructing a section longer than the standard length of the pipe or installing the bent section, it is necessary to use a pipe connection device or weld the pipes by connecting them together.

On the other hand, various types of pipe connectors for connecting synthetic pipes (soft pipes or rigid pipes) have been conventionally proposed.

Prior art related to conventional pipe fittings is disclosed in Korean Patent Publication No. 10-1439499 entitled " Pipe fittings "(Registered on Apr. 2014.09.02), in which a fluid passage is formed so as to allow fluid to pass therethrough, A packing body inserted into the expanded tube portion to seal the space between the pipe and the expanded tube portion, and a sealing member inserted into the expanded tube portion to seal between the expanded tube portion and the expanded tube portion, Preventing ring and a packing member which are installed between the bottom of the pipe and the bottom of the pipe, and which have a separation preventing portion contacting the outer circumferential surface of the pipe and a packing seating portion on which the packing member is seated, A fastening portion formed on the inner circumferential surface of the fastening portion so as to press the packing member in the fastening portion, Wherein the release preventing ring comprises: a packing seating part formed in a flat plate shape so that the packing member is seated so as to support the packing member; and a packing holding part which is formed on an outer circumferential surface of the packing seating part to bend downward, A linear portion which is bent at an inner circumferential surface of the packing seating portion in a downward direction and faces an outer circumferential surface of the pipe and a distal end portion of the linear portion which is bent at a predetermined angle to the pipe side and contacts the outer circumferential surface of the pipe And the detachment preventing portion having a tooth portion to be inserted therein.

In this case, the edge of the support end portion of the release preventing ring is vertically supported on the stepped portion on the inner circumferential surface of the expanded portion, and the portion of the release preventing ring which is contacted to be supported by the expanded portion is limited to the end portion of the support portion. In the process of tightening the tightening nut to the connecting body after being fitted in the connecting pipe and contacting the packing member, the pressure transmitted from the outside is prevented from being released through the packing member There is a fear that the release-preventing ring may be deformed as it is transmitted to the packing seating portion of the ring, so that the bending piece may not penetrate into the inside of the pipe.

If a sufficient pressing force can not be transmitted to the packing member, the airtightness with the pipe is lowered, and the fluid passing through the pipe may leak to the outside.

Another prior art related to conventional pipe connection is disclosed in Korean Patent Publication No. 10-1709723, entitled " Pipe Connection Port "(Registered on Feb. 17, 2017), and includes a hollow first hollow pipe in the form of a cylinder, A plurality of bending pieces of an elastic material formed to extend from both longitudinal ends of the first connection pipe and having an inner diameter and an outer diameter larger than an inner diameter and an outer diameter of the first connection pipe, A connection body including a pair of second connection tubes arranged at regular intervals and hollowed in a cylindrical shape; And a hollow connection releasing member having a cylindrical shape and fitted in the second connection pipe so as to linearly move in the longitudinal direction of the second connection pipe, wherein an inner diameter of the connection releasing member and an inner diameter of the first connection pipe And a plurality of projections extending along the circumferential direction are formed on the outer circumferential surface of the connection releasing member, and a guide having a width larger than the width of the protrusions is formed on the inner circumferential surface of the second connection tube, And the outer circumferential surface of the connection releasing member is formed so as to be stepped in two stages so that the inner diameter of the inner end of the connection releasing member is relatively small, and the inner circumferential surface of the second connection tube is connected to the outer circumferential surface of the connection releasing member One end of the bending piece is horizontally inserted into the inner peripheral surface of the second connection pipe, and the other end of the bending piece is inserted When the connection pipe is elastically supported on the pipe inserted through the connection releasing member so as to be inclined downwardly in the direction of the first connection pipe and presses the connection releasing member fitted in the second connection pipe in the direction of the first connection pipe And an inner end portion of the connection releasing member adjacent to the first connecting pipe presses the other end portion of the bending member elastically supporting the pipe to release the contact state with the pipe, A seating groove is formed along the circumferential direction on the inner circumferential surface of the second connection tube so that the other end of the bending member to be pressed by the inner end of the connection releasing member is seated when the pressing member is pressed toward the first connection tube.

In this case, one end of the bending piece is inserted into the inner circumferential surface of the second connection pipe, and the other end is adapted to elastically support the pipe when the pipe is inserted. The contact state between the other end of the bending member and the outer peripheral surface of the pipe is released However, as compared with the configuration in which the teeth are pierced into the outer circumferential surface of the pipe as in the above-described existing prior art Korean Patent Registration No. 10-1439499 entitled "Pipe Connection Port ", the connection supporting force with the pipe is weakened, There are drawbacks to this.

As another prior art related to the existing pipe connector, as disclosed in Korean Patent Registration No. 10-1362781 entitled " Pipe Connector "(Registered on Apr. 21, 2014), a first step is formed on the inner circumferential surface A plurality of radially projecting flanges on the inner side of the flange, the radially extending flanges being positioned at a second step formed at a position relatively higher than the first step to the inner circumferential surface of the socket, A grip ring formed of a grip piece for gripping an outer circumferential surface of the pipe inserted into the slope socket, a washer for holding the center of the pipe so as to prevent eccentricity of the pipe which is seated on the grip ring and inserted thereinto, A seal ring which is seated on the outer circumferential face of the pipe inserted into the inner circumferential face of the socket, Pressure, and the upper portion of the plurality of fastening member to be cut piece is formed to be in close contact with the outer peripheral surface of the pipe in order to prevent separation of the pipes; And a cap nut screwed to the socket such that a cut-out of the tightening member presses the outer circumferential surface of the pipe, wherein the grip ring is configured such that the flange widens the surface area to increase the strength limit due to warping and deformation And the washer is interposed between the seal ring and the grip ring to prevent the seal ring from being damaged by the contact of the grip ring.

In this case, in a state where the lower portion of the first bent portion of the grip ring is supported to be in contact with the second step, the extension of the washer supports the grip piece of the grip ring during the process of seating the washer, The pipe can be securely fixed by gripping the outer circumferential surface of the pipe and the seal ring can be prevented from being damaged by the contact between the grip ring and the seal ring via the washer between the grip ring and the seal ring And the grip ring is formed with a curved portion at each of the flange and the grip piece to prevent deformation of the grip ring due to an increase in surface area. However, the grip and the cap nut must be provided, A structure in which a washer provided with an elongated frame is required is complicated and difficult to assemble, and a manufacturing cost for processing a fastening member having a washer and a separator There is a disadvantage that it increases.

In addition, it is difficult to form a curved portion in each of the flange and the grip piece of the grip ring, and there is a fear that the screwed state of the cap nut is released.

Another prior art related to the existing pipe connector is disclosed in Korean Patent Publication No. 10-1506467 entitled " Pipe Connector "(Registered on Feb. 23, 2013), a fluid passage is formed so as to pass a fluid therethrough, A packing body inserted into the expanded portion and sealing the space between the expanded portion and the expanded portion, and a sealing member inserted into the expanded portion to seal the gap between the expanded portion and the expanded portion, And an outer circumferential surface of the connecting body is formed with an inner circumferential surface and an inner circumferential surface of the outer circumferential surface of the connecting body is formed with a pressing portion formed in the inner circumferential surface to press the packing member And a loosening preventing means provided between the connection body and the tightening nut to prevent loosening of the tightening nut, Wherein the loosening preventing means is formed to overlap the pressing portion of the tightening nut protruding from the end of the bending portion of the connecting body and having a plurality of protruding surfaces formed in a saw tooth shape on the inner circumferential surface facing the pressing portion And a second engaging portion protruding from the outer circumferential surface of the pushing portion of the tightening nut facing the first engaging portion and engaged with the projecting surface of the first engaging portion, wherein the first engaging portion has a predetermined elasticity The first engaging portion and the second engaging portion are formed to be in contact with the second engaging portion at a constant elastic force, and the facing surfaces of the first engaging portion and the second engaging portion are respectively engaged with the first engaging portion and the second engaging portion, As shown in Fig.

In this case, it is possible to prevent the tightening nut from being loosened by the loosening preventing means composed of the first latching portion and the second latching portion. However, in the state where the end of the packing seating portion is supported by the inner peripheral surface step of the expansion portion, Even if the release preventing ring enters the inner circumferential surface of the expanding portion in the horizontal state, there is a fear that the release preventing ring is not horizontal due to the external force during the seating process of the packing material. In the process of pressing the packing member, There is a possibility that the deviation preventing ring is deformed.

However, as described above, since the portion of the existing pipe connector which is contacted with the debris prevention ring to be supported by the expansion portion is limited to the end portion of the support portion, the release pipe is inserted into the connection pipe and contacts the packing member, There is a fear that the release-preventing ring may be deformed as the pressure transmitted from the outside is transmitted to the release-preventing ring through the packing member in the process of pressing and fixing, and there is a fear that the bending piece can not penetrate into the inside of the pipe have.

If a sufficient pressing force can not be transmitted to the packing member, the airtightness with the pipe is reduced, and the fluid passing through the pipe may leak to the outside.

In addition, when the length of the existing elastic material is long, the pipe is infiltrated into the pipe due to the interference with the outer circumferential surface of the pipe to obtain a strong connecting force. On the other hand, There is a possibility that interference with the outer circumferential surface of the pipe may not be achieved during the process of drawing the pipe.

On the contrary, if the length of the bending piece of the elastic material is reduced, the possibility of deformation in the process of entering the pipe is reduced, but the length of the bending piece penetrating into the outer circumferential surface of the pipe becomes short while interfering with the outer circumferential surface of the pipe, There is a possibility that the pipe can be easily separated to the outside.

In the case of connecting the conventional air intake type fire detection pipe, heat is transferred to the pipe when the hot fluid moves inside the pipe, but when the pipe is connected so as not to be stretched due to the heat change by the release prevention ring The pipe may be deformed.

Korean Registered Patent No. 10-1439499 entitled "Pipe End Connection" (Registered Date: 2014.09.02) Korean Registered Patent No. 10-1709723 entitled "Pipe Connector" (Registered on Feb. 17, 2017) Korean Registered Patent No. 10-1362781 entitled "Pipe Connector" (registered on Feb. 2014) Korean Registered Patent No. 10-1506467 entitled "Pipe Connector" (registered on Feb. 23, 2013)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and its object is to improve the structure of a connection pipe and a release preventing ring to prevent the pipe from being released after entering the pipe, The pipe extending into the left-side expanded portion is stretched and contracted in accordance with the heat transfer in a state of being supported by the packing material, thereby suppressing the deformation of the pipe due to heat, It is possible to prevent the deformation of the insertion piece toward the inner circumferential surface of the hollow pipe during the entry of the pipe so that the insertion piece can be well inserted into the outer circumferential surface of the pipe in the process of withdrawing the pipe so that the elasticity of the insertion member can be maintained. As the length is penetrated, the structure of the pipe And to provide an improved expandable pipe connection structure.

According to an aspect of the present invention, there is provided a connector comprising: a connection portion having a hollow for allowing a pipe to enter and out of the connection portion; and a left and right side portion having an inner diameter and an outer diameter larger than inner and outer diameters of the connection portion, A connecting pipe having a tube portion; A fitting groove formed on the inner circumferential surface of the stepped portion of the left and right expanding portions and the connecting portion so as to be engaged with the fitting piece of the detachment prevention ring and an extending surface horizontally extending from the inner end of the fitting groove to the inside of the connecting portion, A stepped portion formed of an inclined surface formed to be inclined from an end of the extended surface to an inner peripheral surface of the connecting portion; A seating surface which enters into one of the left and right expanding portions and is configured to correspond to a sectional shape of the stepped portion and which is seated so that the lower side is in surface contact with the upper side of the extending surface; A pipe extending from the other end of the pipe to a hollow side and inclined downward in a direction of entering the pipe, being bent at the time of entry into the hollow of the pipe, A release preventing ring made of a plurality of insertion pieces having elasticity to be inserted into the outer peripheral surface of the insertion preventing ring; And an inner rim of the inner rim of the extension surface is inserted into the left and right expansion parts and guided in the left and right expansion parts of the left and right expansion parts, A packing material having a width larger than a width of the extending surface so as to protrude to the center side of the hollow; And a stopper sleeve which is detachably fitted to the left and right expanding parts and whose ends are in contact with the packing material.

The inclination angle of the inclined surface with respect to the extended surface is formed at an angle larger than an inclination angle of the insertion piece with respect to the seating surface so that the insertion piece has a clearance space that can be bent when entering the hollow of the pipe.

The insertion piece has a narrower width from the rim to the end of the seating surface, and the length of the insertion piece is longer than the length of the inclined surface.

The outer circumferential surface of the stopper sleeve and the inner circumferential surface of the left and right expanded portions are bonded with an adhesive.

The fitting piece is formed to have a length that can be rotated to the outside when coming into the hollow of the pipe and contact with the bottom surface of the fitting groove.

The packing material is formed with a slanting inclined portion on the lower side so that the thickness thereof becomes thicker toward the outer edge at a portion where the packing material is in surface contact with the seating surface.

The pipe 50 which is introduced into the hollow 105 through the right expansion part 130 is connected to be fixed by the release prevention ring 300 but the expansion part of the pipe through the left expansion part 120 The pipe 50 entering the hollow 105 is expanded and contracted by heat in the longitudinal direction of the pipe 50 while being supported by the packing material 400 so that deformation of the pipe 50 by heat It has an advantage that can be prevented.

Since the stepped portion 200 corresponding to the sectional structure of the departure prevention ring 300 is formed in the present invention, the seating surface 310 of the departure prevention ring 300, which has entered through the right side tube portion 130, It is possible to restrain the deformation of the escape prevention ring 300 even when an external pressing force is transmitted to the packing material 400 in the process of engaging the stopper sleeve 500, It is possible to prevent warp deformation while interfering with the insertion piece 330 of the release preventing ring 300 at the time of entry of the release preventing ring 300.

The angle of inclination of the inclined surface 230 is set to be smaller than the angle of inclination of the insertion piece 330 with respect to the seating surface 310 so that the inclined surface 230 has a clearance that can be bent when the insertion piece 330 enters the hollow 105 of the pipe 50 The insertion member 330 is prevented from being deformed toward the inner circumferential surface of the hollow 105 during the entry of the pipe 50 so that the pipe 50 The elasticity of the insertion piece 330 can be maintained.

Since the outer circumferential surface of the stopper sleeve 500 and the inner circumferential surface of the left and right expanded portions 120 and 130 are adhered to each other by the adhesive agent 550 in the prior art, the present invention can prevent the tightening nut from being loosened, The present invention is advantageous in that it can be easily applied to the air suction type fire detection pipe 50 after the stopper sleeve 500 is assembled so as to prevent loosening .

The present invention has a sufficient length to allow the fitting piece 320 of the detachment prevention ring 300 to contact with the bottom of the fitting groove 210 so that it is transmitted to the separation preventing ring 300 when the pipe 50 is drawn out And has an advantage that the load can be dispersed and the deformation can be prevented.

1 is an exploded perspective view of a telescopic pipe connection structure according to the present invention;
FIGS. 2A and 2B are a perspective view and a bottom perspective view of the departure prevention ring of the present invention; FIG.
FIG. 3 is an assembled state view of a pipe introduced through the left and right expansion parts of the present invention. FIG.
FIG. 4 is an enlarged view showing a state in which the release preventing ring of the present invention is seated on the step portion and supported by the packing material.
FIG. 5A is a view showing a state where a pipe enters the right-side expanding part of the present invention, FIG. 5B is a view showing a state in which the insertion part of the release preventing ring is stuck to the outer peripheral surface of the pipe, Fig.
FIG. 6 is a state of use in which a pipe connected to a pipe extending in the right-side expansion portion of the present invention is fixed and a pipe entered into the left expansion portion is expanded and contracted by heat.
7 is a front view showing a modified example of the packing material of the present invention.
8 is a use state showing a state in which a modified example of the packing material of the present invention is applied.

1 to 6, the pipe connection structure according to the present invention includes a connection portion 110 having a hollow 105 to allow a pipe to be inserted into and out of the pipe connection portion 110, A connecting pipe (100) having an inner diameter and an outer diameter larger than an inner diameter and an outer diameter of the connecting portion (110), and having left and right extending portions (120, 130); A fitting groove 210 formed in the inner circumferential surface of the stepped portion of the left and right expanding portions 120 and 130 and the connecting portion 110 so that the fitting portion 320 of the detachment prevention ring 300 is fitted and engaged, An extended surface 220 extending horizontally from the inner end of the connection part 210 to the inner side of the connection part 110 and a sloped surface 230 formed to be inclined from the end of the extended surface 220 to the inner peripheral surface of the connection part 110 A stepped portion 200 formed on the stepped portion 200; And the bottom surface of the bottom surface of the stepped portion 200 is formed in a shape corresponding to the sectional shape of the stepped portion 200 and enters the inside of one of the left and right expanded portions 120 and 130, A plurality of fitting pieces 320 extending downward from one side edge of the seating surface 310 to be inserted into the fitting groove 210 and a hollow portion 105 extending from the other side of the seating surface 310, And is inclined downward in the entering direction of the pipe 50 to be bent when the pipe 50 enters the hollow 105 and to be pushed into the outer peripheral surface of the pipe 50 when the pipe 50 is drawn out after entering the pipe 50, (300) composed of a plurality of insertion pieces (330) having an insertion hole The length of the pipe 50 inserted into the left and right expanded portions 120 and 130 and into the left and right expanded portions 120 and 130 of the left and right expanded portions 120 and 130, A packing material (400) guiding the directional transfer and having a width larger than the width of the extended surface (220) so that the inner side edge thereof protrudes toward the center side of the hollow (105) than the inner side edge of the extending surface (220); And a stopper sleeve (500) detachably fitted to the left and right expanding parts (120, 130) and having an end contacting the packing material (400).

1, the connecting pipe 100 is formed in a cylindrical piping structure having a hollow 105, and the outer diameter of the connecting portion 110 and the outer diameter of the hollow portion 105 are formed on both left and right sides of the connecting portion 110, And the left and right expanding parts 120 and 130 are formed so as to communicate with each other to allow the pipe 50 to enter and exit.

The left and right expanding parts 120 and 130 are formed with stepped steps 200 from both ends of the connecting part 110 and the fitting groove 210 is formed on the inner peripheral surface of the stepped part 200.

The release preventing ring 300 is inserted into one of the left and right expanding parts 120 and 130 and is coupled to the inside of the step part 200. Hereinafter, As shown in the drawings.

The fitting groove 210 is formed in a stepped structure so as to have a groove in the entering direction of the pipe 50 so that the fitting piece 320 of the detachment prevention ring 300 is received and accommodated.

The extended surface 220 is formed to extend horizontally from the inner end of the fitting groove 210 toward the hollow 105 and is connected to one side connected to the fitting groove 210 and the inclined surface 230 Is preferably rounded so as to support the rotation of the separation preventing ring (300) generated when the pipe (50) enters and leaves the pipe (50).

The inclined surface 230 extends from the inner end of the elongated surface 220 to the inner circumferential surface of the hollow 105 and is inclined downward in the entering direction of the pipe 50.

The release preventing ring 300 has a sectional structure corresponding to the upper surface section of the stepped portion 200 connected to the fitting groove 210 and the extended surface 220 and the inclined surface 230. For this, A seating surface 310 which is seated on the upper side of the elongated surface 220 so as to be in surface contact with each other and is seated on the upper side so that the packing material 400 is in surface contact with the seating surface 310, A plurality of fitting pieces 320 extending downward from the rim and fitted into the fitting groove 210 and a plurality of fitting pieces 320 extending from the other side of the seating surface 310 toward the hollow 105, And a plurality of insertion pieces 330 having an elasticity such that they are bent so as to be inclined downward and bent when entering the hollow 105 of the pipe 50 and entering into the outer circumferential surface of the pipe 50 when the pipe 50 is drawn out.

The detent ring 300 is formed such that the fitting piece 320 extends downward from one side edge of the seating surface 310 and is formed to be shorter than the length of the insertion piece 330 and spaced apart from each other at regular intervals, And easily enters the groove 210.

It is preferable that the fitting piece 320 is formed to have a length which can be rotated outward when the pipe 50 enters the hollow 105 and can contact the bottom surface of the fitting groove 210, The outflow force of the pipe 50 transmitted from the pipe 50 to the escape prevention ring 300 is dispersed through the seating surface 310 supported by the packing material 400, The load is dispersed through the fitting piece 320 which is in contact with the bottom surface of the separation preventing ring 300, thereby suppressing deformation of the separation preventing ring 300.

The seating surface 310 of the release preventing ring 300 is formed in a circular band shape so as to be in surface contact with the upper surface of the extending surface 220 and connects the fitting piece 320 and the insertion piece 330, The pressing force transmitted from the packing material 400 at the time of coupling the sleeve 500 is dispersed by the extended surface 220 contacting the lower side to suppress the deformation of the separation preventing ring 300.

The insertion piece 330 has a narrower width from the other edge of the seating surface 310 toward the end and a length of the insertion piece 330 is longer than a length of the inclined surface 230.

As a result, it is advantageous to pierce into the outer circumferential surface of the pipe 50 due to a change in the width of the insertion piece 330. The end of the insertion piece 330 protrudes inwardly from the inclined surface 230 to the outer circumferential surface of the pipe 50 It has an advantage that the connecting supporting force of the pipe 50 is strengthened as the length of the end portion to be inserted is inserted to a sufficient length.

The fitting piece 320 may be inserted into the fitting groove 210 and have a length such that the end of the fitting piece 320 is in contact with the bottom of the fitting groove 210. The outflow force of the pipe 50 transmitted from the pipe 50 to the release preventing ring 300 is dispersed through the seating surface 310 supported by the packing material 400 during the drawing process of the pipe 50 In addition, the load is dispersed through the fitting piece 320 which is in contact with the bottom surface of the fitting groove 210, so that deformation of the separation preventing ring 300 can be suppressed.

3, when the release preventing ring 300 enters the connection pipe 100 through the right side expanding part 130, the insertion piece 320 of the release preventing ring 300 is inserted into the fitting groove 210 And the fitting surface 310 is in surface contact with the extension surface 220 and the insertion piece 330 is coupled so as to be inclined downward in the entry direction of the pipe 50 toward the hollow 105. [

The packing material 400 is an O-ring structure having a through hole 405 formed at the center so as to fit the pipe 50 in the center thereof. The packing material 400 has an O- The one end of the stopper sleeve 500 is inserted into the left and right expanding parts 120 and 130 so as to be closely attached to the seating surface 310 of the release preventing ring 300 The pressing force is transmitted to press the seating surface 310 of the separation preventing ring 300.

The packing material 400 has an inner side edge protruding toward the central side of the hollow 105 more than the inner edge of the extended surface 220 to be fitted to the outer peripheral surface of the pipe 50 at the time of entering the pipe 50, (220).

The stopper sleeve 500 has a cylindrical pipe structure in which one end enters the inside of the left and right expanded portions 120 and 130 and the other end has a flange.

The inclination angle? 1 of the inclined surface 230 with respect to the extended surface 220 is formed at an angle larger than the inclination angle? 2 of the insertion piece 330 with respect to the seating surface 310, A clearance gap is formed from the inclined surface 230.

The clearance gap is a clearance space in which the insertion piece 330 can be bent when the pipe 50 or 50 enters the hollow 105.

As shown in FIG. 3, the inner circumferential surface of the left and right expanding parts 120 and 130 and the outer surface of one end of the stopper sleeve 500 are coated with an adhesive 550 to form an inner circumferential surface of the left and right expanding parts 120 and 130, As shown in Fig.

The adhesive 550 may be applied to the inner circumferential surface of the left and right expanding parts 120 and 130 or may be applied to the outer surface of one end of the stopper sleeve 500 or may be coated on the inner circumferential surface of the left and right expanding parts 120 and 130, 500 may be coated with an adhesive 550 on both sides of the outer surface of the one end portion.

The stopper sleeve 500 is integrally adhered to the inner circumferential surfaces of the left and right expanding parts 120 and 130 by the adhesive 550 so that the stopper sleeve 500 is prevented from being detached from the outer side and the packing material 400 and the release- It is possible to suppress the outflow and the flow of the refrigerant 300.

In this case, since the pipe 50 of the present invention employs the air intake type fire detection pipe 50, it is not necessary to disassemble the pipe 50 once it is assembled so that the pipe 50 is connected to the pipe 50, There is an advantage that it is possible to easily prevent the stopper sleeve 500 from being loosened by using the adhesive 550 without having to provide loosening preventing means for preventing loosening of the tightening nut.

The unexplained reference numeral 115 denotes a pipe extending from the inner circumferential surface of the hollow portion 105 of the connection portion 110 in the form of a band so as to extend in the length direction of the pipes 50 and 50 entering through the left and right expanding portions 120 and 130 And the stopper stop 115 restricting the stopper stopper 115. FIG.

4, when the seating surface 310 of the escape prevention ring 300, which has entered through the right-side expanding portion 130, is seated on the extending surface 220, as shown in FIG. 4, And the insertion piece 330 becomes a free end inclined toward the hollow 105 at an angle spaced from the inclined surface 230. As shown in FIG.

Thereafter, when the packing material 400 is introduced through the left and right expanding portions 120 and 130, the packing material 400 is fitted and held in contact with the outside of the seating surface 310 of the release preventing ring 300 coupled to the right expanding portion 130 .

In the process of bonding one end of the stopper sleeve 500 to the inner circumferential surface of the left and right expanding parts 120 and 130 using the adhesive 550, one end edge of the stopper sleeve 500 presses the packing material 400 The seating surface 310 of the prevention ring 300 is brought into close contact with the extended surface 220.

In this case, since the seating surface 310 of the release preventing ring 300 coupled to the right-side expanded portion 130 is in surface contact with the extended surface 220, the packing material 400 is fixed in the prior art The outer pressing force is transmitted to the separation preventing ring 300 to deform the separation preventing ring 300 while the pressing force generated in the coupling process of the stopper sleeve 500 is released through the packing material 400 The external pressing force is dispersed toward the extended surface 220 through the seating surface 310 to prevent the deformation preventing ring 300 from being deformed.

5A, when the pipe 50 is introduced into the hollow 105 of the connection part 110 through the inside of the left and right expansion parts 120 and 130, The pipe 50 inserted into the hollow 105 is coupled to the outer circumferential surface of the pipe 50 in the through hole 405 of the packing material 400.

6, the pipe 50, which is introduced into the hollow 105 through the left-side expanded portion 120, is connected to the pipe 50 through which heat is transferred by the hot fluid passing through the inside of the pipe 50, The pipe 50 that has entered the left expansion part 120 in the state of being supported by the packing material 400 is extended in the longitudinal direction and enters the hollow 105, The pipe 50 is retracted to be returned to the original position while being supported by the packing material 400, and is telescopically operated according to the heat change.

The pipe 50 which has entered the hollow 105 through the right tube portion 130 interferes with the insertion piece 330 whose outer peripheral surface of the pipe 50 is free in the process of entering the pipe 50, The detent ring 300 is rotated so that the detent ring 330 is bent so that the detent ring 320 of the detent ring 300 is held in contact with the inner surface of the fitting groove 210, The insertion piece 330 inclined in the opposite direction to the outer circumferential surface of the pipe 50 drawn out to the outside is pierced into the outer circumferential surface of the pipe 50 and is buried in the pipe 50, As shown in Fig.

Therefore, in the pipe connection structure of the present invention, the pipe 50, which is introduced into the hollow 105 through the right-side expanding portion 130, is connected to be fixed by the escape prevention ring 300, The pipe 50 entering the hollow 105 through the pipe 50 is expanded and contracted by heat in the longitudinal direction of the pipe 50 while being supported by the packing material 400, It has an advantage of preventing deformation.

Since the stepped portion 200 corresponding to the sectional structure of the departure prevention ring 300 is formed in the present invention, the seating surface 310 of the departure prevention ring 300, which has entered through the right side tube portion 130, It is possible to restrain the deformation of the escape prevention ring 300 even when an external pressing force is transmitted to the packing material 400 in the process of engaging the stopper sleeve 500, It is possible to prevent warp deformation while interfering with the insertion piece 330 of the release preventing ring 300 at the time of entry of the release preventing ring 300.

The angle of inclination of the inclined surface 230 is set to be smaller than the angle of inclination of the insertion piece 330 with respect to the seating surface 310 so that the inclined surface 230 has a clearance that can be bent when the insertion piece 330 enters the hollow 105 of the pipe 50 The insertion member 330 is prevented from being deformed toward the inner circumferential surface of the hollow 105 during the entry of the pipe 50 so that the pipe 50 The elasticity of the insertion piece 330 can be maintained.

Since the outer circumferential surface of the stopper sleeve 500 and the inner circumferential surface of the left and right expanded portions 120 and 130 are adhered to each other by the adhesive agent 550 in the prior art, the present invention can prevent the tightening nut from being loosened, The present invention is advantageous in that it can be easily applied to the air suction type fire detection pipe 50 after the stopper sleeve 500 is assembled so as to prevent loosening .

The present invention has a sufficient length to allow the fitting piece 320 of the detachment prevention ring 300 to contact with the bottom of the fitting groove 210 so that it is transmitted to the separation preventing ring 300 when the pipe 50 is drawn out And has an advantage that the load can be dispersed and the deformation can be prevented.

7 and 8 are views showing another modification of the packing material 400 of the present invention. Unlike the previously described embodiment, the packing material 400 has a surface contact with the seating surface 310 and a contact with the seating surface 310 And a slanting protrusion 410 is formed on the lower side so that the thickness of the slanting protrusion 410 becomes thicker toward the outer edge.

The inclined protrusion 410 has a tilted structure such that the thickness of the outer circumferential edge of the packing material 400 is larger than the thickness of the inner circumferential surface of the through hole 405.

The slanting protrusion 410 is formed such that the lower side of the slanting protrusion 410 is inclined at an angle corresponding to the slant angle of the slit 320 of the slant prevention ring 300, So that it is advantageous in that deformation of the fitting piece 320 can be prevented when the pipe 50 is pulled out.

Although the present invention has been described in detail with reference to specific embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the appended claims, as well as the appended claims.

That is, the present invention described above is not limited to the above-described specific preferred embodiments, and any person skilled in the art will be allowed to use the present invention without departing from the gist of the present invention. It will be understood that various modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims.

50: Pipe 100: Connection piping
105: hollow 110:
120: left side expanding part 130: right side expanding part
200: stepped portion 210: fitting groove
220: Extension surface 230: Inclined surface
300: Disengagement prevention ring 310:
320: insertion piece 330: insertion piece
400: packing material 405: through hole
410: oblique protrusion 500: plug sleeve

Claims (6)

(110) having a hollow (105) for allowing the pipe (50) to enter and exit from the inside thereof and an inner diameter and outer diameter larger than inner and outer diameters of the connecting portion (110) A connecting pipe (100) having left and right expanding parts (120, 130);
A fitting groove 210 formed in the inner circumferential surface of the stepped portion of the left and right expanding portions 120 and 130 and the connecting portion 110 so that the fitting portion 320 of the detachment prevention ring 300 is fitted and engaged, An extended surface 220 extending horizontally from the inner end of the connection part 210 to the inner side of the connection part 110 and a sloped surface 230 formed to be inclined from the end of the extended surface 220 to the inner peripheral surface of the connection part 110 A stepped portion 200 formed on the stepped portion 200;
And a bottom surface of the upper surface of the stepped portion 200 is formed with a shape corresponding to a sectional shape of the stepped portion 200 and is positioned so that the lower side is in surface contact with the upper side of the extended surface 220. [ A plurality of fitting pieces 320 extending downward from one side edge of the seating surface 310 to be inserted into the fitting groove 210 and a hollow portion 105 extending from the other side of the seating surface 310, And is inclined downward in the entering direction of the pipe 50 to be bent when the pipe 50 enters the hollow 105 and to be pushed into the outer peripheral surface of the pipe 50 when the pipe 50 is drawn out after entering the pipe 50, (300) composed of a plurality of insertion pieces (330) having an insertion hole
The length of the pipe 50 inserted into the left and right expanded portions 120 and 130 and into the left and right expanded portions 120 and 130 of the left and right expanded portions 120 and 130, A packing material (400) guiding the directional transfer and having a width larger than the width of the extended surface (220) so that the inner side edge thereof protrudes toward the center side of the hollow (105) than the inner side edge of the extending surface (220); And
And a stopper sleeve (500) which is detachably fitted to the left and right expanding parts (120, 130) and whose ends are in contact with the packing material (400). The method according to claim 1,
The inclination angle of the inclined surface 230 with respect to the extended surface 220 is set such that the insertion piece 330 has a clearance that can be bent when entering the hollow 105 of the pipe 50, Is formed at an angle larger than an inclination angle of the insertion piece (330). The method according to claim 1,
The insertion piece 330 is narrowed from the rim to the end of the seating surface 310 and the length of the insertion piece 330 is longer than the length of the inclined surface 230. [ Pipe connection structure. The method according to claim 1,
Wherein an outer circumferential surface of the stopper sleeve (500) and an inner circumferential surface of the left and right expanded portions (120, 130) are bonded with an adhesive (550). The method according to claim 1,
Wherein the fitting part (320) is formed to have a length that can be rotated outward when the pipe (50) enters the hollow (105) and contact the bottom surface of the fitting groove (210). The method according to claim 1,
Wherein the packing material (400) has a slanting protrusion (410) inclined to a lower side of the packing material (400) so that the packing material (400) becomes thicker toward the outer edge at a surface contact area with the seating surface (310).

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