KR20080001400U - A pipe jointing structure - Google Patents

Abstract

The present invention relates to a joint structure for pressing and tightening a thin metal tube by press fitting, and improves the joint structure so that the pressure of the crimping tool is effectively transmitted to the metal tube, thereby reducing the metal crimping ring to form a deeper groove in the metal tube wall. However, the shape of the compression ring and the elastic packing are formed to be in contact with a large area as compared with the conventional circular cross section so that the watertight is maintained without crack corrosion. It also allows for the maintenance of presses and the application of crimped joints to larger diameter pipes.

Pipe joints, crimped joints, elastic packings, crimping rings.

Description

A crimped joint structure with enhanced shock resistance

1 is a longitudinal cross-sectional view showing a connection state of a conventional crimping joint pipe, the pressing ring having a circular cross-section shows a structure to increase the tightening force than when there is no pressing ring by pressing the metal pipe.

Figure 2 is a longitudinal cross-sectional view showing a connection state of another conventional crimped joint pipe as compared to Figure 1 shows a structure in which the clamping ring is improved to improve the fastening force.

Figure 3 is a longitudinal cross-sectional view showing a connection state of another conventional crimped joint pipe as compared to Figure 2 shows a structure in which the cross-section of the elastic packing is improved from circular to square to improve the performance of watertight.

Figure 4 is a longitudinal cross-sectional view showing a connection state of another conventional crimping joint pipe as compared to Figure 3 shows a structure in which the watertight force is increased by forming a step.

5 is a longitudinal sectional view showing a connection structure of a joint pipe according to the present invention;

6 is a conceptual diagram comparing watertightness of various crimp joints.

7 is a conceptual view of watertight when the expansion and contraction of the axial direction of the joint pipe due to the change in temperature or external vibration of the joint pipe according to the present invention.

Figure 8 is an example of another embodiment showing a crimping ring cross section according to the present invention.

Figure 9 shows a part of the longitudinal section showing another embodiment of the combination of the metal ring and the elastic packing according to the present invention.

Figure 10 shows a part of the longitudinal cross-section showing another embodiment of the combination of the metal ring and the elastic packing according to the present invention.

Explanation of symbols on the main parts of the drawings

100: first metal tube 200: second metal tube

300: joint pipe (connecting one or more 310 and 340)

310: joint 311: ridge 312: pressing ring insertion groove

313: inner pressing ring insertion groove step portion 314: outer pressing ring insertion groove step portion

315: inner elastic packing insertion groove 316: outer elastic packing insertion groove

317: inner elastic packing insertion groove stepped portion 318: pipe insertion portion

320, 320 ': Crimping ring 321: outer circumference

322: outer portion 323: inner portion 324: inner peripheral portion

330: elastic packing 331: inner elastic portion 332: outer elastic portion

333: crimping portion 334: inner end 335: outer end

335 ': outer protrusion

336: outer peripheral surface 337: outer peripheral surface

338: inner peripheral surface 340: body

The present invention relates to a joint coupling structure for crimping the end of a joint pipe after extrapolating a joint pipe having the same inner diameter as the outer diameter of the metal pipe using the plastic deformation of the metal pipe in the joint joint of the metal pipe.

Metal pipes widely used for fluid transfer have a variety of fastening methods, but thin-walled metal pipes are difficult to weld or cut, so they are often fastened by crimping.

In the prior art of such a method, there is a conventional elastic packing in the Republic of Korea Patent Registration 10-50369 (1992. 03. 31) [connection method of the pipe using a crimped pipe fitting in which the metal ring is inserted] Fastening force is increased and fastening is possible by simple crimping, compared to fastening alone, but the fastening force is weak due to the circular cross section of the metal ring and the elastic packing material, and the Republic of Korea Patent Registration 10-394852 (2003, 08, 04) illustrated in FIG. The fastening structure of the crimped pipe fitting is improved from the circular to the rectangular shape, and the tightening force is increased by the increase of the compressive force, but the shortage of watertightness in the long-term use due to the change of the mutual position of the metal pipe and the joint pipe due to repeated heat shrinkage and expansion 20-357228 (2004, 07, 14) [compression fastening structure of the metal pipe] of the Republic of Korea registration room illustrated in Figure 3 has a rectangular cross section of the metal ring and elastic packing material However, the above disadvantages have been substantially improved, but there is a problem in that watertightness is insufficient in long-term use due to the change of the mutual position of the metal pipe and the joint pipe due to gap corrosion or heat shrinkage and expansion.

Meanwhile, the registration room 20-422119 illustrated in FIG. 4 has a rectangular shape of the compression ring and the elastic packing, and the elastic packing forms a step, thereby greatly improving the above problems, but ensuring watertightness due to repeated temperature changes and external vibration. There is a limit to doing so.

The present invention is to improve the shape of the pressing ring and the elastic packing material, and to further improve the shape of the pressing ring and the elastic packing material to deepen the grooves generated in the metal tube when the pressing ring is pressed in order to improve the above problems, and also the pressing ring of metal The purpose of this is to improve the elastic packing appropriately to prevent the gap corrosion occurring in the gap between the metal pipe and the metal pipe, and to make the joint more resistant to the pressure and the temperature inside the pipe as well as to the external vibration.

The configuration of the present invention having the above purpose will be described with reference to the accompanying drawings.

Figure 5 is a structural diagram showing the connection state of the joint when there is a joint at both ends of the socket according to the present invention, according to the needs of the joint may have a number of joints, for example, a joint in the tee or cross joint Or it may be four cases, in which case the elbows, bands, bellows, elbows, bellows, t-branchs, external branches, cross-branches, reducers or flanges are connected instead of the body. It is a joint pipe, a tee pipe, a wai pipe, a cross pipe, a reducer pipe, and a flange pipe. When one joint is connected to only one end of a metal pipe, it is a single pipe.

 In the case of having a single joint, the tube insert 318 having a diameter large enough to barely enter the body 340 or the metal tube to be connected to and connected to the metal tube 340 or the inner diameter of the metal tube 100 or 200 to be fastened thereto. Insertion grooves 312 and 315 or 316 and the flange 311 to insert the pressing ring 320 and the elastic packing 330 and the end 311 is formed at the end of the tube and the pressing ring and the elastic packing are inserted into the grooves, respectively. The metal tube is inserted into the joint part to the end of the tube insertion part, and the end of the metal tube is in contact with the body.

The pressing ring 320 according to the present invention has an inner portion 323 perpendicular to the outer peripheral portion 321 forming an upper arc as shown in FIG. 5, and an inner peripheral portion 324 forming an arc of an outer portion 322 and a lower vertical line. As a general, it is an annular ring having a shape where the upper and lower sides are replaced by an arc in the shape of a rectangle that is longer than the width, and is made of stainless steel, and the height of the cross section is preferably 1.2 to 2 times the width, but especially about 1.5 times Do.

In FIG. 6A, a gap may occur between the inner circumference of the pressing ring and the metal tube when pressing the outer circumferential surface of the compression ring insertion groove with a crimping fastening tool using hydraulic pressure. In this case, the depth of the groove formed in the metal tube in this case is the shallowest in the example of FIG. 6, so that the watertightness due to expansion or contraction due to vibration or temperature change may be the lowest.

In contrast, in FIG. 6B according to the present invention, the center of the inner circumferential portion 324 of the crimping ring is first touched so that the compressive force is concentrated, so that the recess groove is deeper than in FIG. 6A.

On the other hand, Fig. 6C is a circular crimping ring, the depth of the yaw groove is the same as B of Fig. 6, but the cross-sectional coefficient of the crimping ring is small, that is, the ratio of width and height is small Therefore, the tightening force at the time of use is smaller than the above two cases.

The elastic packing 330 according to the present invention is a crimping portion paired with the inner circumferential portion 324 and side portions 322 and 323 of the pressing ring extrapolated to the pressing ring in the center of the outer peripheral portions 336 and 337 as shown in FIG. 333 and the inner and outer elastic parts 331 and 332 having a polygonal shape and the inner and outer ends 334 and 335, and the outer and inner peripheral parts 338 of the inner and outer sides are flat, and the inner end 334 The outer end 335 is perpendicular to the inner circumference, but the inner end and the inner outer circumference and the outer end and the outer outer circumference 337 are adjacent to the chamfering slope 339 and the outer protrusion 335 'is a ridge 311. It protrudes correspondingly.

The elastic packing is a part that closely adheres to both sides between the joint pipe and the metal pipe to maintain watertightness, and is more stable as the area of contact with the metal pipe increases, but in FIG. 6, the contact length is long in the order of C → A → B. It can be seen that the packing is most stably maintained in watertightness. Meanwhile, in the case of A and C in FIG. 6, the grooves of the metal pipe are different due to the different strength of the support ring on both sides of the pressing ring. If it is not right may occur, but in the case of the present invention is configured to be symmetrical left and right is always a constant groove (凹) is formed.

In particular, the compression portion of the elastic packing is formed thin so as to be easy to be in the shape of the groove, and the elastic portion with a large change in shape before and after compression has a thick thickness, thereby making the watertight easier structure.

On the other hand, the chamfering slope of the elastic packing prevents large deformation at the time of expansion of the joint and consequently has a middle step between the pipe inserting portion 318 and the pressing ring inserting groove 312 so that It increases the rigidity and increases the watertightness of the elastic packing. In this case, it can be formed by a similar function rounding instead of chamfering.

7A illustrates a case in which the metal tube 200 contracts due to temperature or vibration, and thus, when the yaw groove of the metal tube is biased to the right, the pressure at the lower left end (arrow mark) forming an arc of the pressing ring 320 is shown. This gradually increases the resistance to expansion and the lower left part of the crimp portion of the elastic packing is more tightly sealed to the metal tube, and the water tightness of Fig. 7 is the case of the expansion of the groove of the metal tube to the left side of the compression ring arc As the pressure of the lower right end (arrow mark) is gradually increased, it resists expansion, and the lower right part of the crimp portion of the elastic packing becomes more tightly sealed to the metal tube, resulting in better resistance to temperature changes or external vibration.

The pressing ring insertion groove 312 is a space for accommodating the pressing ring 320 is preferably inserted 1/2 to 1/5 of the overall height of the pressing ring, more preferably 1/3 to 1 of the overall height of the pressing ring It should be about / 4 and the shape should be integrally paired with the crimping ring.

The inner and outer elastic packing insertion grooves 315 and 316 are spaces for accommodating the elastic packing, and are formed to be integrally formed with the elastic packing described above, preferably in a position where the entire height from the pipe insertion part to the compression ring insertion groove is secured. It is desirable to have a step.

The tube inserting portion 318 is a length of 0.5 times the outer diameter of the metal pipe to subtract the length of the inner elastic packing insertion groove step 317 so as not to fall out when the crimped pipe joint is subjected to an external force such as bending. It is preferable to maintain the length so that the tube insert is most preferably about 0.7 times the outer diameter of the metal tube.

8 shows another embodiment of the cross section of the pressing ring according to the present invention to replace the outer peripheral portion 321 and the inner peripheral portion 324 of the pressing ring with a chamfer in place of the shape of the arc or to chamfer the both edges of the arc of the inner peripheral surface as well These have similar effects to arcs.

9 shows various combinations of the changed cross sections of the compression ring and the elastic packing, which may have a similar effect to the present invention. FIG. 9A shows the compression ring and the compression ring of the circular section in and out of the tube used at a lower pressure, respectively. When the elastic packing is inserted, B in Fig. 9 is a case in which the inner and outer peripheral surfaces of the compression ring forming an arc in the rectangular cross section and the elastic packing is inserted into the inner and outer sides, respectively, and C does not chamfer the side edges of the outer peripheral surface. Elastic packing is inserted into the inside and outside of the pressing ring.

FIG. 10 is another combination of the changed cross section of the compression ring and the elastic packing, which may have an effect similar to that of the present invention in FIG. 9. In FIG. 10A, the inner and outer ends of the elastic packing may be obliquely trapezoidally formed to fix the elastic packing. 10 and B of Figure 10 is to form a pressing ring in a circular shape in the pipe used at a lower pressure.

Compared with the conventional structure, the fastening force is stronger and the clamping structure is more stable than the conventional structure, and stable watertightness is ensured continuously even with fluctuations in internal pressure and temperature change, and withstands external vibration to some extent. can see.

Claims (9)

An insertion groove of the crimping ring and the elastic packing is formed at the end of the joint pipe, and a metal pipe connecting the crimping joint pipe into which the crimping ring and the elastic packing is inserted is inserted into the insertion groove, and the joint pipe and the metal pipe are crimped and connected at the same time. In the joint structure,  The joint is connected to the pressing ring 320, an insertion groove for integrally receiving the inner elastic packing 331 and the outer elastic packing which is connected to the pressing part on the inner circumferential surface 324 of the pressing ring, and the tube inserting part for storing the metal tube to be connected. Forming, but the connection method of the joint pipe and the joint pipe according to the method, characterized in that forming the elastic packing insertion grooves (315 and 316) on the inner and outer sides of the pressing ring insertion groove, respectively. According to claim 1, Pressing ring is a joint structure having a joint structure, characterized in that the outer circumferential surface and the inner circumferential surface facing each other to form a convex arc shape and the joint structure having such a joint structure. According to claim 1, Another embodiment of the crimping ring is characterized in that the outer circumferential surface is flat but chamfered at the side of the side and the inner circumferential surface is flat or convex at its center and chamfered at the side of the side. Joint structure and joint pipe having such a joint structure. According to claim 1, The cross section of the crimping ring is a ratio of the width in the axial direction and the height in the radial direction of the metal pipe is 1: 1 to 1: 2 but preferably 1: 1.5 joint structure and the joint pipe having such a joint structure . According to claim 1, The pressing ring insertion groove is to be in close contact with the outer circumferential surface of the pressing ring, the insertion depth is 1/2 to 1/10 of the overall height of the pressing ring, but preferably formed of 1/4 to 1/3 A joint structure characterized by a joint and a joint pipe having such a joint structure. According to claim 1, The elastic packing is formed in the shape of a close contact with the inner peripheral surface of the pressing ring in the inner peripheral surface portion of the pressing ring: In the inner elastic part and the outer elastic part, the chamfering is performed at the openings of the outer peripheral surface and the side, respectively, and the length of one side of the chamfer is about 1/2 of the height of the elastic packing so that the elastic packing insertion grooves are stepped at regular intervals: A joint structure having a joint structure and a joint structure, characterized in that the outer step portion protrudes to the bottom of the joint of the joint pipe so that no gap is formed between the ribbon and the metal tube. The method of claim 6, Elastic packings can be rounded instead of chamfers: A joint structure having a joint structure and a joint structure, characterized in that the step of the inner elastic portion extends to the tube inserting portion. In one paragraph, the one side is connected to the body of the joint pipe and the other side is connected to the elastic packing insertion groove and the tube insert portion is equal to the outer diameter of the metal tube to be inserted, but the length is equal to the outer diameter of the metal tube 0.5 to the outer diameter, but preferably Joint structure having a joint structure and characterized in that formed in about 0.7 times. According to claim 1, Joints are sockets or nipples with joints at each end of the body, each formed of a straight metal tube: Elbows, reducing, returning or bellows, each having a joint at each end of the body, which is a straight metal tube, at an angle, instead of a straight body:   It is also a tee joint, a cross joint, a wai joint which forms a joint at each end of the body having one or more branch pipes instead of the body: The joint structure and the joint pipe having such a joint structure, characterized in that the one-piece pipe formed with one joint on one side of the metal tube in place of the body.

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