KR200173980Y1 - Expansion joint - Google Patents

Abstract

The present invention relates to an expansion joint, wherein one end of the main tube is inserted into one end of the exterior, and the annular contact ring is fixed to the welding joint so that the inner circumferential surface of the exterior is located between the main tube and the exterior. A rubber packing is inserted to be positioned at an outer side of the contact ring between the main pipe and the exterior, and the rubber packing is pressed onto the contact ring by a pressure ring of a crimping fastening means for crimping and connecting the main pipe and the exterior. A sliding contact portion is provided in an area in which the rubber packing is movable so that the rubber packing can move smoothly when the packing is compressed. The rubber packing has a recess in the inner middle part, and the contact ring has a recess in the rubber packing. Multiple pressure holes are provided at regular intervals to apply pressure inside the pipe The resistance of the configuration.

This invention is designed to move the rubber packing unobstructed during the sliding movement by the expansion and expansion action of the tube, the service life is long, the pressure in the pipe acts close to the rubber packing to close the leakage effect, Appearance is maintained at a constant interval there is an effect that can prevent the rubber packing from being damaged by excessively pressed.

Description

Expansion Joint {EXPANSION JOINT}

The present invention relates to an expansion joint for elastically connecting joints of various pipes, in particular, the rubber packing is moved unobstructed during the sliding movement by the expansion and expansion action of the pipe, the service life is long, The pressure in the tube is in close contact with the rubber packing to increase the leakage blocking effect, and maintains a constant interval between the main pipe and the exterior is related to the expansion joint to prevent the rubber packing from being damaged by excessively pressed.

Conventionally, the dresser type expansion pipe used for the expansion pipe of steel pipe is epoxy coated on the surface of the steel pipe, and the rubber packing is assembled on this surface, and if it is left for a long time, it will stick to the surface of the epoxy paint. There was a problem that the function is lost.

Figure 8 shows the configuration of a conventional valve joint device, (a) is a partial cut-away longitudinal cross-sectional view, (b), (c) is shown a partial left side view and a partial right side view, respectively, Figure 9 (a) A cross-sectional view taken along line CC of FIG. 10 is shown, and a cross-sectional view taken along line DD of FIG. 8A is shown in FIG.

As shown in the drawing, in the conventional valve jointing device, one end of the main pipe 1 is inserted into one end of the outer shell 2, and the front end portion 2c of the outer shell 2 and the crimping fastening means 10 'are crimped. The rubber packing 15 is crimped and fixed between the rings 12, and the appearance of the The contact portion of the tip portion 2c and the rubber packing 15 is processed in a triangular cross-section so that a wider area is in contact.

In addition, the crimping fastening means 10 has fastening holes communicating with each other on the fixing ring 11 fixed to the outer circumferential surface of the exterior 2 and the crimping ring 12 disposed at a predetermined interval therebetween. It is formed so that it is fastened by the some bolt 5 and the nut 5d.

In addition, the reinforcement fastening means 20 of the crimping fastening means 10 is coupled to the fixed ring 11 and the crimping ring 12 at regular intervals, and is fixed to the outer circumferential surface of the main tube 1 (13) ) And a structure in which a plurality of long bolts 6 and nuts 6c, 6d, 6e, 6h, 6i, which are supported and coupled to each other, are fastened.

In the drawings, reference numerals 1a and 2a show flanges fixed to the ends of the main pipe 1 and the exterior 2, respectively.

As described above, the conventional expansion joint has a cross-sectional shape of the rubber packing 15 in the shape of a trapezoid, which is pressed by the pressing ring 12 from the rear surface 15a of the rubber packing 15 so that the point of the rubber packing 15 is increased. The tip portion 15b is prevented from leaking by being pinched by the tip portion 2c of the exterior 2 and the pressing projection piece 12a welded to the pressing ring 12. The surface of the main pipe 1 is epoxy coated. The rubber packing 15 is assembled on this surface, which results in the rubber packing 15 sticking to the epoxy-coated surface during long-term use, and as the steel pipe of the pipe expands and expands, the main pipe 1 or As the outer tube (2), which is a movable tube, moves, the rubber packing (15) stuck to the surface of the steel tube is damaged, and eventually the damaged surface There is a problem of leakage.

Therefore, there is a problem that the pipe cannot be stretched or expanded by the worker entering the inside of the pipe to prevent leakage and welding the main pipe (1) and the exterior (2) of the pipe to the main pipe (1) and the exterior (2). As a result, serious problems have arisen that the pipeline is easily aged.

Therefore, the present invention was devised to solve the above-mentioned conventional defects and problems, and the rubber packing moves without being disturbed when the rubber packing slides due to the expansion and contraction of the tube, and the service life becomes long. The purpose of the present invention is to provide an expansion joint in which the pressure inside the pipe acts on the rubber packing so that the water leakage blocking effect is increased, and the main pipe and the exterior are kept at regular intervals, thereby preventing the rubber packing from being damaged by being excessively pressed. have.

1 is a configuration of the expansion joint according to an embodiment of the present invention, (a) is a partially cut longitudinal cross-sectional view, (b) is a cross-sectional view taken along line BB of (a), (c) is AA of (a) Line cross-sections are shown respectively.

2A is a partially enlarged view of FIG. 1A.

3 is an enlarged cross-sectional view of the expansion and tightening unit.

Figure 4 is a partial cutaway longitudinal sectional view of the expansion joint according to another embodiment of the present invention.

Figure 5 is a partial longitudinal cross-sectional view showing another embodiment of the present invention.

Figure 6 is a partial longitudinal cross-sectional view showing yet another embodiment of the present invention.

Figure 7 is a cross-sectional view showing the configuration and operation of the main portion of the packing of the present invention.

Figure 8 shows the configuration of a conventional valve bonding device, (a) is a partially cut longitudinal section, (b), (c) is a partial left side view and a partial right side view.

Fig. 9 is a cross-sectional view taken along the line C-C in Fig. 8A.

10 is a cross-sectional view taken along the line D-D in FIG. 8 (a).

<Description of Symbols for Major Parts of Drawings>

1: Main Building 1a, 2a: Flange

1b, 2b: protrusion 2: appearance

3: pressure ring 4: rubber packing

5: Bolt 5a, 5b, 5c, 5d: Nut

6a, 6b, 6c, 6d, 6e, 6g, 6h, 6i: nut 6: long bolt

7, 7 ': stainless steel pipe 7a: sliding contact

8: contact ring 8a: pressure through hole

8b: stopper 10: compression fastening means

11: retaining ring 12: crimping ring

20: reinforcing fastening means s: recessed part

In order to achieve the object as described above, the expansion joint according to the present invention has one end of the main tube inserted into one end of the exterior, and the annular contact ring is located between the main tube and the exterior on the inner circumferential surface of the exterior. The rubber packing is inserted into the outer side of the contact ring between the main body and the exterior, and the rubber packing is crimped to the contact ring by a pressure wheel serving as a packing grand of the compression fastening means for pressing and connecting the main body and the exterior. The main pipe is provided with a sliding contact in the area where the rubber packing can move so as to move smoothly when the rubber packing is pressed It is composed.

The rubber packing is formed with an annular U-shaped indentation in the inner middle portion, and a plurality of pressure holes are formed in the contact ring at regular intervals, and the pressure inside the tube is applied to the indentation portion of the rubber packing through the pressure hole. The rubber packing is deformed by the load so as to be in close contact with the outer circumferential surface of the main building and the inner circumferential surface of the exterior and the contact ring.

For example, pipe expansion joints used for manual steel pipes are piping materials with a device that absorbs the expansion and expansion of steel pipes.The main pipe is constructed so that the rubber packing is not damaged while the exterior moves on the sliding contact surface of the main pipe. The stainless steel sheet was overlaid on the steel surface to prevent corrosion from occurring, thereby minimizing damage due to the sticking of the rubber packing.In particular, stainless steel pipes can be directly connected to the non-large diameter steel pipe by welding methods. Formed. In addition, the shape of the rubber packing is formed by using a simple trapezoidal shape as a rubber packing having a special U-shaped indentation. By effectively opening up the pressure to block the leakage and to push the rubber packing from the outside to press the appropriate pressure to improve the method that had to press the conventional rubber packing with a large force. In addition, in order to prevent the pressure ring pressing the rubber packing from pressing the rubber packing with excessive force, it is possible to maintain the degree of pressing by the nut coupled to the bolt for fastening.

Hereinafter, the embodiment in the accompanying drawings of the present invention as described above in more detail The explanation is as follows.

1 is a configuration of an expansion joint according to an embodiment of the present invention, (a) is a partial cut-away longitudinal cross-sectional view, (b) is a cross-sectional view taken along line BB of (a), (c ) Is a cross-sectional view taken along line AA of (a).

2A shows a partially enlarged view of FIG. 1A, FIG. 3 shows an enlarged cross-sectional view of a stretchable fastener, and FIG. 7 shows a cross-sectional view showing the construction and operation of a packing, which is a main part of the present invention. have.

In addition, in the drawing, 1 is a main building, 2 is an external appearance, and one end of the main building 1 is inserted inside one end of the exterior 2, and the main building 1 and the exterior (2) are formed on the inner circumferential surface of the exterior 2. The rubber packing 4 is inserted so that the annular contact ring 8 is fixed to the welded joint so as to be located between the centers and the outer contact ring 8 between the main tube 1 and the exterior 2. The rubber packing (4) is pressed onto the contact ring (8) by a pressing ring (3) serving as a packing gland of the pressing fastening means (10) for crimping and connecting the main pipe (1) and the exterior (2), The main tube 1 is provided with a sliding contact portion 7a in an area in which the rubber packing 4 can move so that the rubber packing 4 can move smoothly when the rubber packing 4 is compressed.

The crimping fastening means 10 is formed in the fixed ring 11 fixed to the outer circumferential surface of the exterior (2) and the fastening holes communicated with each other in the crimping ring (12) disposed at a predetermined interval therebetween at a predetermined interval. And a plurality of bolts 5 and nuts 5a, 5b, and 5c fastened to each other, and a pressure ring 3 fixed to the lower end of the crimping ring 12 carries the rubber packing 4 into the main pipe. Between the outer circumferential surface of (1) and the inner circumferential surface of the distal end portion 2c of the outer appearance (2), It is comprised so that the contact ring 8 may be crimped | fixed and fixed.

In addition, the crimping fastening means 10 may be configured to include a reinforcing fastening means 20, the reinforcing fastening means 20 is a flange (1a) fixed to the end of the main pipe (1) and the exterior (2) ), (2a) is a configuration in which a plurality of long bolts 6 and nuts 6a, 6b, 6c, 6d, 6e, and 6f that are installed at regular intervals are fastened. Can be.

The long bolts 6 and the nuts 6a, 6b, 6c, 6d, 6e and 6f are flanges 1a and 2a of the main pipe 1 and the exterior 2, respectively. ), A plurality of protrusions 1b and 2b are formed, and fastened through the holes formed in the protrusions 1b and 2b.

In addition, the rubber packing 4 has a concave inlet portion s formed in the inner middle portion, and the contact ring 8 has a plurality of pressure through holes 8a formed at regular intervals. The rubber packing 4 is deformed by being applied to the concave inlet s of the rubber packing 4 through 8a) so as to be in close contact with the outer circumferential surface of the main tube 1 and the inner circumferential surface of the exterior 2.

Conventionally, the sliding contact portion 7a of the main building 1 according to the present invention is made of a general steel tube and the packing slides on a surface coated with a tar epoxy coating or a liquid epoxy resin, and the outer side of the main building 1 The rust-resistant stainless pipe (7) is used to cover the rust.

In addition, the sliding contact portion 7a of the main tube 1 may have a configuration in which the stainless tube 7 'is bonded to the main tube 1 by a predetermined length as shown in FIG. 2A.

Another form of the sliding contact portion 7a of the main building 1 is the main building 1 itself. Example A configuration using a stainless tube may be employed.

For example, it is preferable to use a structure in which a stainless steel pipe is directly welded to a steel pipe other than a large diameter, and a structure in which a large diameter pipe is covered with a stainless steel pipe is used.

As described above, according to the present invention, the stainless steel main tube 1 is covered with the stainless steel tube 7, the stainless steel tube is covered with the stainless steel tube 1, or the steel main tube 1 is formed of a stainless steel tube, and the sliding contact portion 7a is formed. By processing to prevent rust, the rubber packing 4 slides the sliding contact portion 7a without being torn off, thereby minimizing damage. Accordingly, the crimping force of the pipe expansion joint can be adjusted easily and accurately as necessary, and the life is improved. .

In addition, according to the present invention, the rubber packing 4 is pressed by an appropriate force from the outside by the pressing wheel 3 of the crimping fastening means 10, and the rubber packing 4 has an internal pressure at an inner middle portion. Concave inlet (s) is formed so as to receive well, a plurality of pressure through holes (8a) are formed in the contact ring (8) at regular intervals, the pressure inside the pipe through the pressure through holes (8a) of the rubber packing (4) By applying the concave inlet s, the rubber packing 4 is effectively opened from the inside to the outside in a dotted line form as shown in FIG. 7 and is pressurized, as shown in FIG. Since it is in close contact with the outer circumferential surface of 1) and the inner circumferential surface of the exterior (2), the leak through the joint is completely blocked.

In addition, since the pressing degree of the pressing wheel 3 of the crimping fastening means 10 can be adjusted by the nuts 5a, 5b, and 5c coupled to the bolt 5, the pressing wheel 3 is provided with a rubber packing (4). ) With excessive force It is possible to prevent the damage to the rubber packing (4) by adjusting so as not to press.

The number of bolts 6 is different depending on the nominal size of the pipe expansion joint, but can be adjusted within the range of four to eight or twelve.

When the long bolts 6 are assembled at the factory and shipped, the nuts 6a, 6b, 6c, and 6d are fastened to the protrusions 1b and 2b of the flanges 1a and 2a. Do not let the tube shrink inwards or break out, so that a certain distance is maintained until the main building (1) and the exterior (2) are installed. In addition, the stopper 9 is installed on the inner circumferential surface of the exterior 2 in order to prevent it from shrinking inwardly and to maintain a constant interval, and the stopper 9 is installed after installing the pipe expansion joint to the pipe nut 6a. ), (6b), (6c), (6d) while releasing the stopper (9) should be removed immediately by tapping the hammer.

After the pipe expansion joint of the present invention is installed in the pipe, the stopper 9 is removed and the nuts 6a, 6b, 6c, 6d fastened to the long bolts 6 are loosened. As shown in Fig. 1, it is fixed in a double nut type, and the distance varies depending on the moving distance of the expansion and expansion, and the nominal diameter of the pipe expansion joint, but is usually about 80 mm to 140 mm.

Then, when the shrinkage action occurs in the pipe is the pipe expansion joint of the present invention has a relatively extending action, at which time the appearance (2) exits from the main building (1) or the main building (1) out of the appearance (2) The sliding surface 4a of the rubber packing 4 moves smoothly while sliding in the outgoing direction by the annular sliding contact portion 7a treated with stainless steel.

At this time, the pressure inside the tube enters the pressure through hole 8a of the contact ring 8, and the internal pressure acts on the annular recess s of the rubber packing 4 so that the rubber packing 4 opens from the inside out. Since the rubber packing (4) is in close contact with the inner circumferential surface and the gap portion of the main pipe (1), the exterior (2) and the contact ring (8) to block the leakage. Since the water, which is the fluid in the pipe, also lubricates, the sliding surfaces 4a of the mutual rubber packing 4 and the outer surfaces of the sliding contact portions 7a do not adhere to each other, so that they do not interfere with the mutual movement, and thus the sliding movement is well performed. Get up.

In addition, when the pipe of the steel pipe is expanded, the pipe expansion joint of the present invention has a relatively inward action, in which the exterior (2) is the direction coming into the main building (1), the main building (1) is the appearance (2) The sliding surface 4a of the rubber packing 4 also slides with the outer surface of the annular sliding contact portion 7a treated with stainless steel. In this case, the internal pressure introduced into the pressure through hole 8a of the contact ring 8 is pressured out in the annular recess s of the rubber packing 4, thereby preventing leakage.

The valve extension joint device of the present invention is widely used as a device that absorbs the expansion and expansion occurring on a steel pipe pipeline by being installed next to a water supply pipe or a valve, and when the valve extension joint device of the present invention is used, the expansion and contraction device is smoothly expanded and expanded. It can prevent the damage of steel pipe.

Figure 4 shows the configuration of the expansion joint according to another embodiment of the present invention, (a) is a partial cutaway longitudinal cross-sectional view, (b) is a partial side view respectively, Figure 5 shows another embodiment of the present invention The partial longitudinal cross section shown is shown.

As shown in the figure, a pair of both main tubes 1 are inserted into the outer surface 2 of the intermediate portion, and annular contact rings are located between the inner tube 1 and the outer surface 2 at the inner peripheral surfaces of both ends of the outer surface 2. The rubber packing (4) is inserted so that the (8) is fixed to the welded joint and located at the outer side of the contact ring (8) between the main pipe (1) and the facade (2), and the main pipe (1) and the facade (2) are inserted. The rubber packing 4 is pressed onto the contact ring 8 by a pressing ring 3 serving as a packing gland of the crimping fastening means 10 for crimping and connecting. The main packing 1 has the rubber packing ( When the 4) is pressed, the sliding contact portion 7a formed by further covering the stainless steel tube 7 is provided with an area where the rubber packing 4 can move so as to move smoothly.

The reinforcement fastening means 20 of the crimping fastening means 10 is coupled to the flanges 1a and 2a fixed to the ends of the main pipe 1 and the exterior 2 at regular intervals and the main pipe 1 A plurality of long bolts 6 and nuts 6c, 6d, 6e, 6f, 6g, 6h, 6i, which are supported and coupled to a bracket 13 fixed to the outer circumferential surface thereof Can be used.

The long bolt 6 and the nuts 6c, 6d, 6e, 6f, 6g, 6h, and 6i are flanges 1a of the main pipe 1 and the exterior 2, respectively. ) And (2a) is fastened through a fastening hole formed at a predetermined interval, and a fastening hole formed in the bracket 13.

And between both main tubes (1) is fixed to the annular reinforcement plate 14, which is attached for reinforcement at the time of product shipment and then removed after installation.

4 and 5 described above, only the connection structure and the construction form are different from those of one embodiment, and other configurations and functions are the same as those of the above-described embodiment.

Figure 6 shows a partial longitudinal cross-sectional view showing a further embodiment of the present invention, yet another embodiment of this Figure 6 welds the stainless steel pipe 7 'as far as the rubber packing 4 can move. Thus, the sliding contact portion 7a is formed, and this embodiment is also different from one embodiment in connection structure and construction, but other configurations and functions are the same as the above-described embodiments.

As described above, the present invention does not paint by treating the surface where the rubber packing contacts with a corrosion-resistant material using a stainless steel tube that is not corroded, so that the rubber packing does not adhere to the sliding surface, thereby expanding and expanding the tube. By virtue of the action, the rubber packing can move without any interference with each other during the sliding motion, and the service life of the rubber packing becomes long.

In addition, the annular contact ring is fixed to the inner circumferential surface of the exterior, and the pressure inside the tube of the fluid flowing into the pressure through hole formed in the contact ring acts from the inside to the outside of the U-shaped recess of the rubber packing, and the rubber packing As it is opened, it is in close contact with the main building, the exterior and the contact ring, so that the pressure in the pipe can be high, and the rubber packing is more tightly adhered to increase the leakage blocking effect.

In addition, the rubber packing of the trapezoidal cross section conventionally provides a cause of increasing the breakage of the rubber packing by pushing only one annular surface of the rubber packing. By using nuts to maintain regular intervals, the rubber packing can be prevented from being excessively pressed and broken. It has an effect.

In the above described and illustrated a preferred embodiment of the present invention, but without departing from the gist of the present invention claimed in the claims below, anyone of ordinary skill in the art to which the present invention pertains can make various changes As such, the protection scope of the present invention is not limited by the above-described embodiment.

Claims (8)

The end of the main building is inserted into the inside of the end of the exterior, and the annular contact ring is fixed to the welded joint and positioned at the outer side of the contact ring between the main building and the exterior so as to be located between the main assembly and the exterior on the inner circumferential surface of the exterior. The rubber packing is inserted, the rubber packing is pressed to the contact ring by the pressing ring of the compression fastening means for pressing and connecting the main tube and the external appearance, the main tube to be able to move smoothly when the rubber packing is pressed An expansion joint, characterized in that the sliding contact portion is provided in the area where the rubber packing can move. According to claim 1, wherein the rubber packing is formed in the concave portion in the inner middle portion, the pressure ring is formed in a plurality of pressure holes at regular intervals so that the rubber packing is in close contact by applying a pressure inside the tube to the concave portion of the rubber packing. Expansion joint, characterized in that the configuration. The expansion joint according to claim 1, wherein the sliding contact portion of the main tube is formed by overlaying a corrosion-resistant stainless tube to the outside of the main tube. The expansion joint according to claim 1, wherein the sliding contact portion of the main tube is formed by joining a stainless tube to the main tube by a predetermined length. The expansion joint according to claim 1, wherein the sliding contact portion of the main tube is formed by forming the main tube itself as a stainless tube. According to claim 1, wherein the compression fastening means is fixed to the outer peripheral surface of the outer surface and the welding ring fixed to the pressing ring disposed at a predetermined interval therein is fastened by a plurality of bolts and nuts, the lower end of the pressing ring An expansion joint fixed to the rubber packing is fixed to the contact ring by pressing the rubber packing in the longitudinal direction of the tube between the outer peripheral surface of the main tube and the inner peripheral surface of the front end portion. The method of claim 1, wherein the reinforcing fastening means of the crimping fastening means is characterized in that the flange is fixed to the end of the main pipe and the exterior, the protrusions formed at regular intervals, and configured by fastening a plurality of long bolts and nuts. Expansion joint. The main body of claim 1, wherein a pair of both main tubes are inserted into an exterior of an intermediate portion, and an annular contact ring is fixed to a welded joint so as to be located between the main tube and the exterior on both inner peripheral surfaces of the exterior. A rubber packing having a concave inlet portion is inserted to be positioned at an outer side of the contact ring, and the rubber packing is pressed onto the contact ring by a pressure ring of a crimping fastening means for crimping and connecting the main tube and the exterior. An expansion joint, characterized in that the sliding contact portion is formed by overlaying a stainless steel pipe in the area where the rubber packing can move so as to move smoothly when the packing is pressed.