KR100394852B1 - Jointing structure of press type pipe joint - Google Patents

Abstract

Corrosion-resistant metal pipes, such as stainless steel pipes or copper pipes, which are widely used for water pipes and indoor pipes in buildings, are very thin in thickness, making it difficult to cut screws or connect welds in the field. There is a problem of deterioration of corrosion resistance due to stress, and a method of mechanically crimping a pipe and a pipe fitting using a crimped pipe fitting is currently used for connecting these pipes. However, these crimp-type fittings currently in use are based on Japanese patents and cannot be checked even if they are crimped in a state where the pipe is not inserted into the fittings to a sufficient length due to the mistake of the pipework. Due to the vibration or shock from the outside or the water pressure fluctuation such as the water hammer inside, the accidental dropping of the pipe could not be avoided, and the leakage of the packing ring groove due to the compression deformation was also frequent.

Therefore, the present applicant can check whether the pipe is inserted into the safety length of the pipe construction process and the crushing phenomenon of the packing ring groove can be solved, which can solve the problem of pipe fallout and leakage during operation, and at the same time, the corrosion resistance of the fastening part is damaged. We are applying for a new press fitting structure that prevents and improves inaccuracy of crimping during construction.

Description

JOINING STRUCTURE OF PRESS TYPE PIPE JOINT}

Crimped fittings such as Japanese Patent Publication No. 53-39873 and Publication No. 57-144385, which are currently used for piping corrosion-resistant circular thin metal pipes such as stainless steel pipes and copper pipes. (1) is the insertion of the tube with the crimping portion 18 having the packing ring 7 at the fastening portion 7 at the end of the fitting and the crimping portion 18 at the insertion end side of the insertion tube 9 or at the end of the fitting. The packing ring (7) on the tip side is adjacent to each other, and the actual insertion length from the insertion end of the tube (9) to the crimping portion (18) on the tube (9) in the hydraulic test after tightening due to its fastening structure. It is not possible to check whether the safety insertion length 11 or more is prevented to prevent the pipe 9 from being pulled out. Ship by vibration, shock and water pressure fluctuation inside pipe (9) and water hammer The dies for crimping the clamping tool when the pipe 9 suddenly falls out of the fitting 1 during operation of the system and the crimping shaft diameter of the fastening portion 3 of the fitting 1 is used. There has been a leakage problem caused by the crushing phenomenon of the packing ring groove 5 by the contact pressure of the.

Therefore, the present applicant is to determine whether the actual insertion length between the end of the pipe (9) inserted in the pipe construction process and the shaft recess (10) formed by the pressing shaft diameter of the fastening ring (6) is more than the safe insertion length (11). The present invention proposes a fastening structure of a new pressurized pipe fitting which can be confirmed and prevents the packing ring groove 5 from being buckled and solves the problems of the omission and leakage of the pipe 9 as described above.

The pipe fitting 1 of the present application is composed of a fitting ring 6 made of metal fitting body 2 and a packing ring 7 of an inertia body, and the coupling ring 6 and the packing ring 7 are respectively axially (軸). It is smaller than the outer diameter of the fastening ring groove 4 and the fastening ring groove 4 formed at the end of the fitting 1 with a certain interval 8 necessary to secure the safety insertion length 11 therebetween. It is mounted in the packing ring groove 5 formed at a greater distance from the end than the fastening ring groove 4 by the outer diameter, wherein the inner diameter of the constant interval 8 or the end of the constant interval 8 is a certain amount than the outer diameter of the inserted tube 9 When the tube 9 and the pipe fitting 1 are crimped and fastened, the fastening tool 12 slides freely on the upper and lower surfaces 16 and 17, resulting in the pipe ( 9) It is installed to be able to move radially from the center and is positioned with a certain distance (15) in the axial direction on the plane toward the center of the tube (9). The fastening ring groove 4 of the fitting 1 in the process of being crimped by a plurality of crimping dies DIES 13 in the fastening tool 12 forming two crimping recesses 14 of the same size. ) And the end of the predetermined interval (8) or the predetermined interval (8) first contact the pressing groove (14) and the predetermined distance (15) or the end of the die 13, the pressing shaft diameter to some extent proceeds after packing ring groove (5) Also, the surface of the fastening recess 14 in the same die 13 is reduced in surface contact, and at the same time, the entire fastening portion 3 continues the remaining shaft diameter to complete the compression fastening, or the packing ring groove 5 of the fastening portion 3 Tension in the direction of the center of the tube (9) which is received at a certain interval (8) at a constant interval (8) or a shaft diameter deformation of the end thereof without surface contact with the pressing recess (14) of the die 13 until completion of the compression shaft diameter The shaft diameter is reduced only by the stress.

When the shaft diameter compression of the fastening part 3 is completed, the outer diameters of the packing ring groove 5 and the fastening ring groove 4 are the same.

Due to such a fastening structure, the main application crimped pipe fitting 1 is checked for insertion beyond the safety insertion length 11 in the hydraulic test of the piping construction process, and faces the die 13 of the packing ring groove 5. It is possible to reduce or eliminate the shaft weight due to the contact, so that the problem of the fall of the pipe (9) during the use of the pipe as in the conventional crimp pipe fitting can be solved. The corrosion resistance of the fastening tool 12 and the accuracy of the crimping work of the fastening tool 12 can be improved. In this case, the inner end of the slide inserting portion 19, which is the most axial inner end of the fastening portion 3, is inserted. The appropriate length of the tube 9 can be easily inserted by stopping the progress of the tube 9 by forming an inner annular locking jaw 20 protruding inwardly with an inner diameter smaller than the outer diameter of the tube 9. .

Missing technical challenges for invention

1 is a partial cross-sectional view of a crimp fastening state of the conventional press fittings Japanese Patent Publication No. 53-39873

2 is a partial cross-sectional view of a crimped fastening state of a conventional crimp fitting, Japanese Patent Laid-Open No. 57-144385.

Figure 3 is a partial cross-sectional view of the pre-compression state of an example in which the tube is inserted into the main application crimp fittings

Figure 4 is a partial cross-sectional view of the pre-compression state in which the tube is inserted into the main application crimp fittings

5 is a partial cross-sectional view of an example of a state in which the main application crimped pipe fittings and pipes are crimped and fastened

6 is a partial cross-sectional view of another example in the state of crimping and fastening the main application crimp pipe fitting

7 is a partial cross-sectional view of a fastening tool

8 is a cross-sectional view of the die mounting portion A-A 'of the fastening tool.

9 is a die cross-sectional view of another example

-Code description of main parts of drawing-

1: pipe fitting 10: shaft diameter groove

2: fitting fitting main body 11: safety insertion length

3: fastening part 12: fastening tool

4: Fastening ring groove 13: Die

5: packing ring groove 14: crimping groove

6: fastening ring 15: constant distance

7: packing ring 16: Sango (上 JAW)

8: Schedule interval 17: Let's do it (below JAW)

DESCRIPTION OF SYMBOLS 9 Pipe 18 Crimping part 19 Slide insertion part 20 Locking jaw

Missing configuration and action of the invention

Missing Effect of Invention

Claims (2)

The open end of the round metal tube is expanded in diameter to a plastic ring, and is connected to the ring annular ring 6 made of metal for crimping with the tube 9 inserted and connected therein. Circular metal tube provided with fastening portions 3 formed by mounting the packing ring 7 of an elastic body for airtightness at intervals of a predetermined distance in the axial direction, respectively. In crimp fittings for connection, Circumferential metal fastening of shape and material that is outwardly annularly protruded at the end of the fitting (3) of the electrical fitting, and plastically deformed by pressing force from the outside on the annular inner surface thereof. Donat in an axially orthogonal cross section between an outer circumferential surface and a circumferential surface of a pipe 9 connected to the electric fastening ring groove 4 and inserted therein, the inner ring of the fastening ring groove 4 for internally mounting the ring 6. (DOUGH NUT) and cylindrical constant interval 8, the inner diameter of which is formed to be larger than the outer diameter of the tube 9 inserted therein so as to form a space. It is connected to the inner end of the predetermined interval 8 in the axial direction and protrudes outwardly to the outer diameter which is smaller than the outer diameter of the fastening ring groove 4, and the packing ring 7 of the elastic body is mounted on the annular inner surface thereof. The outer ring and the inner circumferential surface of the packing ring groove (5) and the pipe (9) which is connected to the packing ring groove (5) and inserted therein in contact with the packing ring groove (5) in the axially inner side of the fitting is in contact with each other, A fastening structure of a crimped pipe fitting having a fastening part 3 having a cylindrical slide insert 19 having a predetermined length. The method according to claim 1, wherein the fastening portions 3 of the pipe fittings 1 respectively form two curved crimp grooves 14 of the same dimension, which are positioned with a predetermined distance 15 therebetween in the axial direction. The shaft is crimped by a plurality of crimping dies 13 in the fastening tool 12, and in the shaft crimping process, the fastening ring groove 4 of the pipe fitting 1 and a predetermined interval 8 or a predetermined interval 8 are provided. The end of the first surface contact with the pressing groove 14 and the constant distance 15 or the end of the predetermined distance (15) of the die 13, the shaft diameter progressed to some extent, and then the packing ring groove 5 is also left in the same die (13). At the same time, the whole of the fastening portion 3 continues the remaining shaft diameter to complete the crimping, or the packing ring groove 5 of the die 13 is finished until the completion of the crimping of the shaft diameter of the fastening portion 3 is completed. From the side of the constant interval 8 by the constant gap 8 or the shaft diameter deformation of the end thereof without contacting the pressing recess 14 with surface contact. The shaft diameter compression is completed only by the tensile stress in the center direction of the tube (9) to be received, and thus the shaft diameter contact groove (10) is squeezed by contact with the fastening ring groove (4), the fastening ring (6) and the fastening ring (6). The pipe wall of the insertion pipe 9 forming the grooves is axially plastically deformed and fastened together through the fastening ring 6, and the packing ring 7 is pressurized by the shaft diameter of the packing ring groove 5 to be sealed. Iii) The fastening structure of the crimp fittings, characterized in that to give a function.