KR200307702Y1 - Sealing Assembly for Protecting Cable Joints - Google Patents

Abstract

The present invention relates to a sealing assembly for protecting the connection of the cable and to prevent foreign matter from penetrating, the sealing assembly of the present invention is separated into two or more pieces, the pieces are bonded to each other and wrap around the cable connection form Wrapped with a crosslinked and stretched protective tube providing a mechanical strength to maintain a constant shape of the cable connection, and a hot melt adhesive layer for adhesion with the protective tube wrapped around the outside of the protective tube in a wraparound form and restored by heat And a heat shrink sleeve made of a polymer sheet for sealing the cable connection, wherein the protection pipe is composed of a semi-circular upper protection pipe and a lower protection pipe which are wrapped around the connection part in a wraparound manner by fitting to each other, respectively, the upper protection pipe and the lower protection pipe, respectively. The protective tube, the body portion; And a crown end portion having a plurality of tapered fan teeth formed at left and right ends in the longitudinal direction of the body portion.

Description

Sealing Assembly for Protecting Cable Joints

The present invention relates to a cable connection sealing assembly for use in sealing to protect a connection connection of a cable, and more particularly, to a sealing assembly that prevents water, moisture, and foreign matter from penetrating into the connection connection of the cable. .

The communication cable between the telephone station and the subscriber or between the telephone stations consists of a plurality of conductors or core wire bundles usually surrounded by an outer protective sheath made of polyethylene or polyvinyl chloride. Such a communication cable is installed in the form of being directly buried underground or buried in the communication pipeline to be buried underground or suspended in the air. In any case, it is necessary to prevent the ingress of water, moisture and foreign matters because there are branching points or connections at appropriate intervals, and these branching points or connections are vulnerable to the penetration of water or foreign matter.

The method for connecting the core of a communication cable at a branch point or connection part of a communication cable is to remove the outer protective covering surrounding the conductors, to electrically connect and arrange the conductors on both sides of the communication cable, and then to connect the heat shrink pipe or mechanical connection. Seal using a sleeve known as a tube. In the case of a heat shrink tube, such a sleeve is configured to tightly seal the communication cable connection as the sleeve itself shrinks and deforms when heat is applied.

Heat shrink sleeves are largely divided into single and double layers. Single layer heat shrink sleeves are used for small communication cables and simple connections, and are carbon black for high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene (PP) Silicon dioxide and other additives are mixed to make a hot melt sheet, crosslinked and stretched. However, since the single-layer heat shrink sleeve does not completely seal the connection part of the multi-wire communication cable from the outside, the multilayer heat shrink sleeve is mainly used for the multi-wire communication cable connection part.

Multi-layer heat shrink sleeve is a mixture of carbon black and a high temperature copolymer having a density of 0.94 to 0.96 on the front and back surfaces, centered on the woven composite, and then heat-melted and extruded, and crosslinked to form a low temperature adhesive polyamide or ethylene vinyl. After re-coating acetate (EVA) and the like, the inner surface of the sleeve is formed by laminating an aluminum thin-film metal layer and a low-temperature copolymer in the form of a film or extrusion coating on the front and back surfaces and then coating the adhesive again. The use of a multi-layered heat shrink sleeve can block external disturbance electromagnetic waves in communication, provide excellent waterproofing effect, and achieve a tighter sealing effect at the connection part of the communication cable.

In most cases, before sealing the connection of the communication cable using a heat shrink sleeve, the connection of the communication cable is wrapped to maintain the mechanical strength to prevent deformation of the connection, to facilitate rework, and to allow the cable to shrink during heat shrink of the heat shrink sleeve. Protective tubes are used to prevent damage to the joints.

The protective tube is usually made of a metal material such as aluminum, has a wrap around shape, and is configured to be opened and closed by a hinge structure so as to easily wrap a connection portion of a communication cable. The opposite side of the hinge structure has a castle-patterned coupling that can be fully engaged with each other.

Currently, heat shrink sleeves and sheaths are being delivered to telecommunications carriers with telecommunication cable networks, and as per delivery regulations, sheaths are made of metal. The main reason for limiting the material of the protective tube to metal is that the protective tube must be heat resistant to the temperature at which the heat shrink sleeve is heated, and sufficient to withstand the stress caused by air pressure generated in the space surrounded by the protective tube. Substantially, the surface temperature applied to the heat shrink sleeve reaches about 1,000 ° C., and the protective tube of the portion bonded to the heat shrink sleeve is exposed to a high temperature of about 150 ° C. to 160 ° C. In addition, the internal pressure is about 1-2.5 kg / cm <2>. Therefore, the protective tube is made of a metal material that can withstand temperatures of 160 ° C. or higher and an internal pressure of about 2.5 kg / cm 2.

However, since the protection tube of the prior art is made of a metal material, there is a problem in that it is difficult to mold the shape of the hinge structure, the shape of the coupling portion of the castle pattern, and the manufacturing and configuration disadvantages that a lot of weight. In addition, when wrapping the connection portion with the protection tube of the prior art, there was also a disadvantage in operation that it is difficult to accurately match both sides of the castle pattern coupling portion.

Therefore, there is a need for a new sealing assembly capable of providing the perfect sealing and protecting effect of the connection with the heat shrink sleeve while satisfying the conditions of the aforementioned temperature and pressure.

The present invention has been made in view of the above-described needs, and an object of the present invention is to provide a sealing assembly capable of protecting the connection portion of the cable tightly while being relatively simple to manufacture, light in weight, and easy to install.

Another object of the present invention is to provide a sealing assembly that provides excellent adhesion and a tight protective effect by using a resin-based protective tube together with a single layer heat shrink sleeve.

1 is a view showing a state of use of the heat shrink sleeve and the protective tube of the present invention,

2 is a cross-sectional view of the heat shrink sleeve of the present invention,

3a is a plan view of the protective tube of the present invention,

3B is a side view of the sheath shown in FIG. 3A,

3C and 3D are cross-sectional views of different embodiments of portions cut along the cutting line A-A 'in the protective tube shown in FIG. 3A;

Figure 4 is a table illustrating the results of testing the adhesion between the protective tube of the present invention and the metal protective tube of the prior art.

<Description of the symbols for the main parts of the drawings>

100: heat shrink sleeve 110: communication cable

120 connection part 130 polymer sheet

140: junction 150: protective tube

210: heat shrink layer 220: hot melt adhesive layer

302: upper protective tube 304: lower protective tube

330: body portion 340: crown end

According to the present invention for achieving the above object, a sealing assembly for protecting the connection portion of the cable and to prevent foreign matter from penetrating, is separated into two or more pieces, the pieces are bonded to each other and wrap around the cable connection A protective tube wrapped in a form to provide mechanical strength to maintain a constant shape of the cable connection portion; And a heat shrink sleeve made of a polymer sheet crosslinked with the hot melt adhesive layer for adhesion to the protective tube and stretched to wrap the outside of the protective tube in a wraparound form to be restored by heat to seal the cable connection. do.

The above-described protective tube is composed of a semi-circular upper protective tube and a lower protective tube wrapped in a wraparound form to the connecting portion by being fit to each other, each of the upper protective tube and the lower protective tube, the body portion and the left and right ends in the longitudinal direction of the body portion It characterized in that it consists of a crown-shaped end formed with two tapered fan meat.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in detail as follows. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 illustrates a state of use of a heat shrink sleeve 100 for sealing a connection such as a communication cable 110 according to the present invention, and FIG. 2 shows a configuration of a partial cross-sectional view of the heat shrink sleeve 100.

The heat shrink sleeve 100 illustrated in FIG. 1 surrounds the entire connection portion 120 of the communication cable 110 in a wraparound manner to seal the connection portion 120 of the communication cable 110. The heat shrink sleeve 100 according to the present invention is a single-layer heat shrink sleeve, the joint portion 140 formed at both ends formed along the longitudinal direction on both sides of the longitudinally formed corners of the polymer sheet 130 and the heat shrink sleeve 100 in a plate shape. And a valve 160 for injecting dry air or gas toward the connection portion 120 wrapped in the heat shrink sleeve 100.

The polymer sheet 130 is sealed in a wraparound manner when sealing the connection portion 120 of the communication cable 110 that is primarily protected by the protective tube 150. Briefly referring to the manufacturing method of the polymer sheet 130, the crosslinked polymer is extruded into a sheet form, and then the sheet is stretched and manufactured. The principle of heat shrinkage is to use the restoring shrinkage force that returns to the state before the pre-stretched and crosslinked polymer is stretched, and the restoring shrinkage can be adjusted as necessary to seal the connection 120 of the communication cable 110. have. The inner surface of the polymer sheet 130, that is, the surface surrounding the connecting portion 120, is coated with a hot melt adhesive described in detail with reference to FIG. 2, and the hot melt adhesive strongly adheres to the surface of the protective tube 150. Thus, the airtightness of the connecting portion 120 is kept tight.

Bonding portion 140 is the connecting portion 120 is bonded to both sides in a state in which the connecting portion 120 of the communication cable 110 covered with the protective tube 150 is placed on the polymer sheet 130 and wrapped in a wraparound form, thereby joining each other. Surrounded).

The protective tube 150 wraps the connection portion 120 of the communication cable 110 in a wraparound form before installing the heat shrink sleeve 100. The protective tube wrapped in the connection portion 120 of the communication cable 110 provides mechanical strength to maintain a constant shape of the connection portion 120, facilitates rework, and communicates during heat shrinkage of the heat shrink sleeve 100. It is possible to prevent the wires of the cable 110 from being damaged. Protective tube 150 is described in more detail in FIG.

That is, although the heat shrink sleeve 100 according to the present invention is a single layer heat shrink sleeve, the protective tube 150 is used to exert the performance of the multilayer heat shrink sleeve.

FIG. 2 shows some nodule cross-sectional views of the polymer sheet 130 shown in FIG. 1. Polymer sheet 130 is comprised of a heat shrink layer 210 and a hot melt adhesive layer 220.

The heat shrink layer 210 is composed of thermoplastic polymer materials such as high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and polypropylene (PP). It is made of crosslinking, radiation crosslinking or physical bridged bonding. The crosslinked polymer allows the whole polymer to be bonded with mobility without flowing out while maintaining flexibility and elasticity when melted by heat. Crosslinking also serves to widen the temperature range required to stretch the polymer sheet.

The hot melt adhesive layer 220 is formed by applying a hot melt adhesive on the heat shrink layer 210 layer. The heated adhesive has cold resistance and heat resistance, and is adhered to an adherend, that is, a protective tube 150 in a molten state by heat (heating at about 180 to 220 ° C.), and then solidified by cooling to form a strong adhesive force within seconds. It is an adhesive. Since the hot melt adhesive does not go through the application, drying, and pressing processes required for general adhesives, the work can be easily performed, and since the solvent does not contain a volatile solvent, it is easy to control the thickness of the adhesive site. . The hot melt adhesive is mainly composed of an ethylene vinyl acetate (EVA) -based or polyamide-based thermoplastic resin.

3A, 3B, 3C, and 3D show a detailed configuration of the protective tube 150 shown in FIG. 1.

The material of the protective tube 150 is made of a synthetic resin (PVC) material, but in consideration of the heating operation, the heat-shrinkable sleeve 100 in consideration of the heat resistance to the temperature generated in the inner space formed by surrounding the connecting portion 120 Any material may be used as long as it has a property of resisting stress caused by air pressure. Substantially, the surface temperature applied to the heat shrink sleeve 100 reaches about 1,000 ° C., and the protective tube 150 of the portion bonded to the heat shrink sleeve 100 is exposed to a high temperature of about 150 ° C. to 160 ° C. In addition, the internal pressure is about 1-2.5 kg / cm <2>. Accordingly, the above-described synthetic resin material constituting the protective tube 150 is a polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) selected to withstand temperatures of 160 ° C. or higher, for example, about 180 ° C. and internal pressure. It is preferably composed of resin or nylon. In this case, in the case of using an ethylene vinyl acetate (EVA) -based hot melt adhesive, the use of the protective tube 150 of polyethylene terephthalate (PET) resin or polybutylene terephthalate (PBT) resin generates stronger adhesive force. In the case of using a polyamide-based hot melt adhesive, it has been found that the use of a nylon protective tube 150 generates a stronger adhesive force.

The protective tube 150 is preferably manufactured by an injection method, but may be manufactured by other methods such as extrusion molding or die-cast molding method. Thus, by using the synthetic resin material, the protective tube 150 is manufactured in comparison with the metal protective tube of the prior art. It is easy to use and light in weight.

The outer surface of the protective tube 150 is also strongly adhered to the heat shrink sleeve 100 by the hot melt adhesive, and the surface thereof is corroded to maintain maximum airtightness. Corrosion treatment means that the surface of the protective tube 150 is specially treated to make the surface slightly rough, such as treated with coarse sandpaper. By performing the corrosion treatment in this way, the adhesion is improved more than when the surface is smooth. For example, the adhesion of the smooth surface was about 70 to 80 kg / cm 2, whereas the adhesion of the corroded surface was about 110 to 130 kg / cm 2.

In that form, the protective tube 150 is divided into two pieces, a semi-cylindrical upper protective tube 302 and a lower protective tube 304 in its longitudinal direction. Each of the upper and lower protective tubes 302 and 304 includes a body portion 330 and a crown end 340 in which a plurality of tapered fan blades 342 are formed at the left and right sides of the body portion 330.

The upper protective tube 302 and the lower protective tube 304 divided into two pieces are custom-fitted as described below when the connecting portion 120 is wrapped to facilitate the operation of wrapping the connecting portion 120 of the communication cable 110. can do.

As can be seen in FIGS. 3A and 3B, the crowned end 340 is inclined at an angle of about 15 ° to 45 °, preferably 30 °, with respect to the center of the protective tube 150, each tapered fan blade. 342 has a taper angle of 2 ° to 10 °, preferably 5 °.

Of course, in the embodiment of the present invention, the protective tube 150 is illustrated and described as being divided into two upper and lower pieces 302 and 304, but divided into a larger number of pieces, for example, both crowned ends Part of the body portion 330 in the vertical direction to include the 340 will be possible to configure a total of four pieces or six pieces. In addition, the inclination angle of the crown end 340 or the taper angle of the tapered fan blade 342 may also be manufactured at an angle larger or smaller than the preferred angle.

3C and 3D show another embodiment of a cross section of the protective tube cut in the (A-A ') direction, respectively.

As can be seen from the cross section cut in FIGS. 3C and 3D, the stepped portion or the uneven portion is formed in the cross-sectional portion where the upper and lower protective tubes 302 and 304 are coupled to each other to increase airtightness. That is, as shown in detail in FIGS. 3c and 3d, the stepped portion and the uneven portion are formed in the cross section where the upper protective tube 302 and the lower protective tube 304 are coupled, respectively. It can prevent the penetration of water or foreign substances through the joint. The cross sections of the upper protective tube 302 and the lower protective tube 304 have a thickness d of about 2 mm to 10 mm, preferably 3 mm, sufficient to form a step. Here, the cross-sectional shape of the coupling portion of the upper protective tube 302 and the lower protective tube 304 has been described by way of example as a stepped portion or uneven portion, it will be apparent to those skilled in the art that various modifications are possible within the scope of achieving the same purpose. In the detailed description of the present invention, various modifications are not suggested. Nevertheless, such modifications will not depart from the scope of the present invention.

When performing the operation of wrapping the connecting portion 120, first, the connecting portion 120 is placed on the lower protective tube 304 and the lower protective tube 304 is covered with the upper protective tube 302 of the lower protective tube 304 and the upper protective tube 302 The stepped portion or the uneven portion is engaged with each other. At this time, the hot melt adhesive may be applied to the stepped portion or the uneven portion to which the upper protective tube 302 and the lower protective tube 304 are coupled to strengthen the adhesive force. According to such a work, the connection part 120 can be wrapped more easily compared with the prior art, and the work time is significantly shortened.

After the installation of the protective tube 150 is completed, the surface of the protective tube 150 is wiped clean with a cleaning cloth, and the both crowned ends 340 of the protective tube 150 are weakened with vinyl tape toward the communication cable 110. Wind about 1/2. At this time, the vinyl tape is not wound around the communication cable (110).

Then, clean the communication cable 110 and evenly polish the surface of the communication cable 110 using sandpaper to increase the adhesion. Subsequently, the communication cable 110 on which the heat shrink sleeve 100 is to be mounted is preheated for several seconds using a heating means such as a torch lamp.

Thereafter, the heat shrink sleeve 100 is wrapped in the protective tube 150 in a wraparound form, and the operation of bonding the joint 140 is performed. By this operation, the hot melt adhesive layer 220 of the heat shrink sleeve 100 is adhered to the surface of the protective tube 150.

Thereafter, the heat shrink sleeve 100 is evenly preheated with a torch lamp, in which case the heat shrink sleeve 100 should not shrink, but should shrink from the center portion of the heat shrink sleeve 100.

The torch lamp must be heated so that the hot melt adhesive applied to the heat shrink sleeve 100 melts completely, and the heat shrink sleeve 100 that has been completely heated by heating is completed after the cooling is completed.

4 is a comparative test of the tensile force when the protective tube 150 according to the present invention to the hot melt adhesive layer 220 of the heat shrink sleeve 100 compared with the protective tube according to the prior art, for example, a metal protective tube made of aluminum Illustrate the results.

First, two test tube specimens of 100 mm in width and 25 mm in length were prepared from the same material as the protection tube 150 according to the present invention for the tensile force test.

An adhesive of the same material as the hot melt adhesive applied to the hot melt adhesive layer 220 of the heat shrink sleeve 100 is applied so that an adhesive film is formed flat on each of the protective tube specimens, but the two protective tube specimens overlap by about 12.5 mm to 14.5 mm. I made it.

The protective tube specimen was placed in an oven exposed to temperature when heating the heat shrink sleeve 100 using a torch, for example, about 150 ° C., and pressed for about 10 minutes under a load of about 1 kg to bond the two protective tube specimens.

The two protective tube specimens thus bonded were pulled in a tensile tester to measure the tensile force five times, and the tensile force of the metal protective tube was measured under the same conditions as described above.

As a result of testing the tensile force, the adhesive force of the protective tube according to the present invention was about 110 to 130 kg / cm 2, and the average adhesive force was calculated to be 120.5 kg / cm 2. On the other hand, the adhesion of the metal protective tube according to the prior art was about 70 to 80 kg / ㎠, the average adhesion was calculated to be 80.8 kg / ㎠. As a result, the protective tube according to the present invention was observed to exhibit about 50% improved adhesion compared to the metal protective tube according to the prior art.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope of the present invention should be interpreted as being included in the scope of the present invention.

According to the present invention described above, the use of a single-layer heat shrink sleeve and a resin-based protective tube to seal the connection of the cable is less expensive than the prior art, and the installation work is simpler, and the effect of creating better sealing and protection results. There is.

In addition, the protective tube of the present invention has the advantage that compared to the metal protective tube of the prior art, it is inexpensive and easy to form, but also excellent adhesion when used with the heat shrink sleeve.

Claims (18)

A sealing assembly for protecting cable connections and preventing foreign matter from penetrating, A protective tube that is separated into two or more pieces, the pieces being coupled to each other and surrounding the cable connection part in a wraparound shape to provide a mechanical strength for maintaining a constant shape of the cable connection part; And Consists of a crosslinked and stretched polymer sheet, a heat shrink sleeve wrapped around the outside of the protective tube and restored by heat to seal the cable connection Sealing assembly comprising a. A sealing assembly for protecting cable connections and preventing foreign matter from penetrating, A protective tube surrounding the cable connection part in a wrap-around shape to provide mechanical strength to maintain a constant shape of the cable connection part; And Heat shrink sleeve made of a polymer sheet that is crosslinked and elongated with a hot melt adhesive layer for adhesion with the protective tube to be wrapped around the outside of the protective tube in a wraparound form and restored by heat to seal the cable connection. Sealing assembly comprising a. A sealing assembly for protecting cable connections and preventing foreign matter from penetrating, A protective tube that is separated into two or more pieces, the pieces being coupled to each other and surrounding the cable connection part in a wraparound shape to provide a mechanical strength for maintaining a constant shape of the cable connection part; And Heat shrink sleeve made of a polymer sheet that is crosslinked and elongated with a hot melt adhesive layer for adhesion with the protective tube to be wrapped around the outside of the protective tube in a wraparound form and restored by heat to seal the cable connection. Sealing assembly comprising a. The method according to claim 1, 2 or 3, And the polymer sheet has a restoring shrinkage as necessary to seal the cable connection. The method of claim 1, The heat shrink sleeve is a sealing assembly, characterized in that the hot melt adhesive for adhesion with the protective tube is applied. The method of claim 4, wherein The protective tube is made of a heat-resistant polyethylene terephthalate (PET) resin or polybutylene terephthalate (PBT) resin, the adhesive is an ethylene vinyl acetate (EVA) -based adhesive seal assembly. The method of claim 4, wherein The protective tube is made of nylon (Nylon) having a heat resistance, the adhesive is a sealing assembly, characterized in that the polyamide-based adhesive (Polyamide). The method of claim 6, And said protective tube is corroded on its surface for increased adhesion to said heat shrinkable sleeve. The method of claim 7, wherein And said protective tube is corroded on its surface for increased adhesion to said heat shrinkable sleeve. The method according to claim 1, 2 or 3, Sealing assembly, characterized in that on both sides of the longitudinal edge of the heat shrink sleeve formed in the longitudinal direction such that both sides are bonded to each other in the state of wrapping the connecting portion of the cable. The method according to claim 1, 2 or 3, The protective tube is a sealing assembly, characterized in that consisting of a semi-circular upper protective tube and the lower protective tube wrapped in a wraparound form to the cable connection by being fitted to each other. The method of claim 11, Each of the upper protective tube and the lower protective tube, Body portion; And Seal assembly, characterized in that consisting of a crown-shaped end formed with a plurality of tapered scallops on the left and right ends in the longitudinal direction of the body portion. The method of claim 12, The upper protective tube and the lower protective tube is a sealing assembly, characterized in that the stepped portion or uneven portion is formed in the coupling end surface for the custom coupling. The method of claim 13, And the upper protective tube and the lower protective tube have a thickness of 2 mm to 10 mm to be sufficient to form the stepped portion or the uneven portion. The method of claim 12, And the crown end has a plurality of tapered scalpels extending in a narrower manner toward both ends of the connecting portion. The method of claim 15, And the crown end is inclined at an angle of 15 ° to 45 ° with respect to the center. The method of claim 15, And the tapered fan blade has a taper angle of 2 ° to 10 °. The method according to claim 1, 2 or 3, And the heat shrink sleeve is used as the single layer heat shrink sleeve by the protective tube.