KR101669070B1

KR101669070B1 - Barrier cable gland

Info

Publication number: KR101669070B1
Application number: KR1020120070745A
Authority: KR
Inventors: 니콜라스 프란즈 에드워드 랙킹어
Original assignee: 씨씨지 오스트렐레이시아 피티와이 엘티디
Priority date: 2012-04-17
Filing date: 2012-06-29
Publication date: 2016-10-25
Also published as: GB2501329B; CN103378575A; AU2012203154A1; GB2501329A; ZA201203710B; GB201209560D0; KR20130117321A; AU2012203154B2; CN103378575B

Abstract

The present invention relates to a method of installing a barrier cable gland in which the compression sealing portion seals the outer surface of a cable sheath immediately surrounding the location between the ends of the cable gland. The cable gland is installed at a cable end prepared so that the compression seal couples the outer surface of the immediately surrounding cable sheath with the terminal end of the immediately surrounding cable sheath near the compression seal. By having the open end of the inner tubular body at the top, the curable liquid two-component resin mixture is introduced into the cavity formed by the compression seal at the inwardly facing surface of the inner tubular body and the lower end of the inner tubular body do. The resin mixture is introduced by a double syringe and each of the two liquid components of the resin is individually packaged in a syringe barrel and the long mixing nozzles are arranged such that when the resin components are injected into the mixing nozzle through the mixing nozzle, Lt; RTI ID = 0.0 > syringe. &Lt; / RTI >

Description

Barrier cable gland {BARRIER CABLE GLAND}

The present invention relates to a barrier cable gland of the type that can be used in a hazardous area in which combustible or explosive gas can enter into a space between a plurality of electrically insulated conductors in an electrical insulation enclosure containing a conductor.

More specifically, but not exclusively, the present invention provides a barrier cable article that can be used in connection with an enclosure or shielded electrical cable, which is not particularly exclusive, but an electrical conductor sheath or shield is interposed between the insulated inner sheath and the electrically insulated outer sheath. It is about land.

Accordingly, the application of the present invention can be applied to any type of conventional, more rigid spirally wound outer wire or less rigid shielded electrical cable in any of various forms including woven or braided layers of copper or aluminum tape and electric conductor wire Lt; RTI ID = 0.0 > cable glands. &Lt; / RTI >

The presence of a combustible or explosive gas mixture in any space within the electrical cable can arise from gas entering from both ends of the cable and any such gas can flow along the length of the cable and exit at the other end of the cable . In this case, the gas can deliver the explosion from one end of the cable to the other end. Also, the cable itself can be severely damaged between the ends of the cable as a result of the rapid expansion of the gas in the cable. The explosive gas may also flow from a harmful gas area of the plant to a non-hazardous area of the plant along the gap of the unfilled cable.

Barrier cable glands are designed to address this problem by sealing the associated end of the cable, typically with any inflow of air from either end of the cable to the space. Of course, the efficiency of the sealing is very important, because if the space is not adequately sealed, the abovementioned problems persist.

Two-part quick setting epoxy putty has been widely used to fill these spaces at the end of the cable. Such systems are increasingly used where compound resin seals can be inspected, particularly by removing the surrounding components of the cable glands.

Placing such an epoxy putty, however, increases the number of conductors passing through a single electrical insulation sheath, which inevitably means more access openings to more space between individually isolated conductors in a bundle, It becomes more difficult and dangerous.

Thus, interest has shifted towards the use of more liquid two-component resins that can flow into openings in communication with the space. One system that began to be marketed several years ago is a system in which two components are intimately mixed and separated by two parts by a transverse clip removed for the purpose of installing the curable liquid resin by way of an outlet at one end of the envelope And provided a generally flat envelope. Substantially similar devices are currently being pursued by different manufacturers. Published European patent applications EP2287084, EP2287986 and EP2294666 all relate to more elaborate details of such a system.

Applicants believe that knocking a generally flat envelope to mix the two components of the epoxy resin together is rather risky unless a significant physical mixing force is applied to the outside of the envelope. Of course, in order to introduce the mixed resin into the gland, the stock period is short, and a compromise has to be made regarding the mixing time and the installation time. If the mixing is not properly performed, the overall integrity of the seal may deteriorate.

Also, since generally flat envelope ropes are quite large in size, it is difficult to wring the envelope by rolling the envelope rope from the opposite end, especially at the opposite end to the discharge end, and in most cases the other hand, You need to use it. Application of liquid resin can be quite cumbersome as a result. Indeed, one of the published European patent applications mentioned above specifically relates to a lid for covering the ends of cable glands during application of the curable liquid resin.

There is a need for an improved method of installing a barrier cable gland using a curable liquid resin consisting of two closely mixed components and a barrier cable gland to be installed using such a method.

As used herein, the term "cylindrical" is intended to include a generally cylindrical surface that is tapered slightly from one end to the other to form a truncated cone of very small cone angle.

It is an object of the present invention to provide an improved method of installing a barrier cable gland using a curable liquid resin consisting of two closely mixed components and a barrier cable gland to be installed using such a method.

In accordance with a first aspect of the present invention there is provided an outer tubular body or union nut having a free end defining an inlet end for a cable and an outer screw thread portion cooperating with the inner tubular body or the inner screw thread portion of the union nut A method of installing a barrier cable gland of the type having an inner tubular body, the two bodies forming an inner cavity, wherein a portion of the inner cavity is formed by a cylindrical inwardly facing surface of the inner tubular body, The cylindrical inwardly facing surface surrounds a plurality of discrete electrically insulated conductors extending from the immediately surrounding cable sheath in the installed state, said cylindrical inwardly facing surface having a release layer or film applied to said cylindrical inwardly facing surface, , At a position between the ends of the cable gland Wherein the compression seal is compressed by screwing the inner tubular body to the outer tubular body or the union nut and the method further comprises the step of compressing the compression seal to the outer tubular body or the union nut, Installing the cable gland on the prepared cable end so as to engage the outer surface of the surrounding cable sheath with the terminal end of the immediately surrounding cable sheath which is generally near the compression seal, Directing the cable gland so that the inner surface of the inner tubular body is at the top, and into the cavity formed by the inner surface of the inner tubular body and the compression seal at the lower end of the inner tubular body, And introducing the mixture, wherein the resin mixture is injected with a double injection And each of the two liquid components of the resin is individually packaged in a syringe barrel and the elongate mixing nozzles are arranged in the syringe barrel so that when the resin components are injected into the mixing nozzle through the mixing nozzle, Wherein the introduction of the resin mixture into the cavity causes the inner seal of the immediately surrounding cable sheath and the inner seal of the immediately surrounding cable sheath to substantially fill the space between the individual conductors of the cable and the surrounding cable sheath, There is provided a method of installing a barrier cable gland, which is performed to substantially fill at least a portion of the cavity immediately adjacent the end.

Another feature of the present invention is that the interior of the cable gland has an open end spaced from the compression seal and the cavity has an open end in front of the inner tubular body of the cable gland from the compression seal, Wherein the resin mixture and the double syringe dispenser are filled with a resin mixture to an open end of the cavity to form a solid plug of a cured resin extending to the cavity, Of a tubular extension of the smaller cross section is attached to the discharge end of the mixing nozzle to facilitate the introduction of the liquid resin mixture between the individual conductors.

In one variation of the invention, the cable gland may have a sheath or shield clamp assembly, the sheath or shield clamp assembly comprising: a clamping conical part held in a captured state relative to the inner tubular body; And a cooperative clamping ring held captively against the tubular body and operatively urged in a cooperative relationship by screwing the inner tubular body to the outer tubular body. In such a case, the inlet into the cable gland has an outer compression seal which is engaged with the cable gland to seal the outer surface of the outer electrical insulation sheath of the electrical cable, and the compression seal, referred to above, An inner compression sealing portion for sealing the outer surface of the inner electric insulation sheath of the battery module is formed.

In another variation of the invention, the cable gland has no outer sheath or shield clamp assembly, and the outer body portion has a compression seal portion to contact the outer surface of the electrically insulative enclosure immediately surrounding the individual electrically insulated conductor It has the form of a union nut for pressurization.

According to a second aspect of the present invention there is provided a cable gland comprising a cable gland, substantially as defined above, wherein a cured plug of resin is located immediately adjacent to the compression seal and is formed by the inwardly facing surface of the inner tubular body of the cable gland An installed cable gland is provided that occupies at least a portion of the cavity. The cured plug of the resin is clean so that inspection of the installed cable gland is convenient and space in the resin plug and air pockets can be observed.

According to a third aspect of the present invention there is provided a cable gland supplied in connection with an instruction to perform the method defined above.

According to a third aspect of the present invention there is provided a dual syringe package of a two-component resin sold in connection with an instruction to perform the method defined above.

BRIEF DESCRIPTION OF THE DRAWINGS In order that the above and other features of the present invention may be more fully understood, one embodiment of the present invention will now be described with reference to the accompanying drawings.

1 is a partial cross-sectional view of one variant of a barrier cable gland provided on a cable showing a plug of a cured resin material taken along the line II in Fig.
2 is a cross-sectional view taken along the line II-II in Fig.
3 is a cross-sectional view taken along the line III-III in FIG.
Figure 4 is a side view of a two-component epoxy package suitable for use in carrying out the method of the present invention.
Figure 5 is a partial cross-sectional view of a second variant of a barrier cable gland similar to Figure 1 and taken along the line VV in Figure 6 without an exterior or shielding clamp in the cable gland.
6 is a cross-sectional view taken along line VI-VI in Fig.

1 to 3 of the accompanying drawings, the method of installing the barrier cable gland according to the present invention is shown in the drawings and applies to the cable gland of the type described below.

Such a cable gland, indicated generally by the reference numeral 1, preferably comprises an outer clamping conical portion 4, which is preferably retained in engagement with the inner tubular body 5, (Referred to herein as "enclosure") of the electric cable 2 with an external clamp assembly that typically includes a co-operating clamping ring 6 that is maintained at a predetermined distance (e.g. The outer clamp assembly is configured to operatively pressurize the enclosure clamping cone portion with a cooperative clamping ring to rigidly clamp the enclosure wire 8 of the cable passing between the outer electrically insulating enclosure 9 and the inner electrically insulating enclosure 10. [ do. This is accomplished by threading an inner tubular body having an outer thread on the outer surface into an outer tubular body having an inner co-thread on the inner surface.

A series of individually insulated conductors 12 extend along the length of the cable within the inner electrically insulative enclosure 10.

The inlet end of the cable gland has an outer compression seal 13 which is actuated by its own union nut 14.

Within the cable gland is an inner compression seal (15) located between the end of the outer clamping cone that is spaced from the outer clamp assembly and the shoulder (16) in the inner tubular body.

As best seen in FIG. 1, such a gland is installed by moving the outer insulating sheath a predetermined distance from the free end of the cable so that the outer sheath is spherical with the outer compression seal in the installed state. Similarly, the inner electrically insulating sheath is formed from a position substantially coincident with the inner compression seal, with the plurality of individual conductors 12 of the cable projecting from the open end 18 of the inner tubular body portion of the cable gland .

The inner tubular body and the outer tubular body form an inner cavity and a portion of the inner cavity is connected to a cylindrical inwardly facing surface 22 of the inner tubular body surrounding a plurality of discrete electrically insulated conductors extending from the inner cable sheath in the installed state .

The cylindrical inwardly facing surface will have a release layer or film applied to the cylindrical inwardly facing surface and an unfixed resin in contact with the release layer or film will not be bonded to the release layer or film, The inner tubular body portion can be removed after the resin is cured.

The inner compression seal, which is sealed against the outer surface of the inwardly cylindrical surface and the inner cable sheath, together form a generally cylindrical cavity through which the individual electrically insulated conductors pass.

As a preparation for carrying out the method of the present invention, the installed cable gland is oriented such that the open end of the inner tubular body is at the top.

Next, the curable liquid two-component resin mixture is packaged in a syringe barrel with two liquid components, resin and epoxy diversity resin, respectively. At the exit from the syringe barrel is mounted an elongated mixing nozzle 26 extending from a manifold 27 connecting the two outlets. The mixing nozzle achieves the purpose of closely mixing the two components when the two components pass serpentine through a series of spaced baffles that alternately project into the restricted flow passages from both sides of the flow passage. It will be appreciated that the operation of one of these dual syringes may be performed using one hand while the other hand may be used to support the cable gland and associated cable.

The dual syringe distributor is preferably a commercially available package of epoxy resin components, although it may be desirable to produce a conventional double syringe distributor having a more suitable overall volume of resin for a particular size of cable gland. A tubular extension 28 of smaller cross section may be attached to the discharge end of the mixing nozzle to facilitate the introduction of the resin mixture into a significantly smaller space between the individual insulating electrical conductors. Such smaller cross-section tubular extensions may thus be used to facilitate introducing the liquid resin mixture between individual conductors by proper manipulation of the dual syringe distributor.

The resin mixture is first subjected to at least an internal compression seal to substantially fill a space between the individual conductors of the cable and the surrounding cable sheath and the inwardly cylindrical surface of the inner tubular body of the cable gland, Is introduced into the cavity to substantially fill the portion of the cavity immediately adjacent the portion and the terminal end of the inner cable sheath. The inner compression seal prevents the liquid resin from further flowing into the gland body through the cable ends.

These cavities are preferably filled with a resinous mixture to an essentially open end of the cavity so as to form a solid plug 31 of cured resin extending from the inner compression seal to the open end of the inner tubular body of the cable gland, do. The resin mixture also abuts the cut end of the inner cable sheath to form an extension toward the inner cable sheath.

For the purpose of inspecting the solid plug of the cured clean resin and ensuring that no harmful air pockets or spaces are left by the appropriate layer of release drug applied to the relevant surface of the inner tubular body of the cable gland, It is possible to remove it.

Of course, it is within the scope of the present invention that the inwardly cylindrical surface can be slightly outwardly widened to facilitate removal of the inner tubular body for inspection purposes.

5 and 6, the present invention is also applicable to cable glands that do not have a shielding clamp associated with the enclosure or enclosure. Such a gland may simply have an inner tubular body 41 that directly cooperates with a nut 42 in the form of a union to compress the compression seal against the outer surface of the unique electrical insulation sheath 44. [ The principles of the present invention are exactly as described above and the inward surface 45 of the inner tubular body is treated with a suitable release layer to which the two-component liquid resin is not bonded. The result is a plug of cured resin that electrically insulates the envelope in the manner described above to extend from the open end in front of the inner tubular body to the cut end of the compression seal and effectively form an extension to the electrical insulation envelope 46).

It will be understood that various modifications may be made without departing from the scope of the invention as set forth in the appended claims. In particular, the shape of the gland to which the present invention is applied can vary widely.

Claims

An outer tubular body or union nut having a free end forming an inlet end of the cable and an inner tubular body having an outer tubular body or an outer screw thread portion cooperating with the inner screw thread portion of the union nut, In a method for installing a gland,
The two bodies form an internal cavity,
Wherein a portion of the inner cavity is defined by a cylindrical inwardly facing surface of the inner tubular body,
Wherein the cylindrical inwardly facing surface surrounds a plurality of discrete electrically insulated conductors extending outwardly of a cable sheath surrounding the electrically insulated conductor,
Said cylindrical inwardly facing surface having a release layer or film applied to said cylindrical inwardly facing surface,
Said cable gland having a compression seal for sealing an outer surface of said cable sheath at a location between ends of said cable gland,
The compression seal is compressed by screwing the inner tubular body to the outer tubular body or the union nut,
The method comprises:
Installing the cable gland on the prepared cable end so that the compression seal couples the outer surface of the cable sheath with the terminal end of the cable sheath located adjacent the compression seal;
Directing the cable gland so that an open end of the inner tubular body is at the top; and
Introducing a curable liquid two-component resin mixture into the cavity defined by the compression seal at the lower end of the inner tubular body and the inwardly facing surface of the inner tubular body,
/ RTI >
The resin mixture was introduced by a dual syringe,
Each of the two liquid components of the resin is individually packaged in a syringe barrel,
The long mixing nozzle is mounted to the double syringe to cause mixing when resin components are injected into the mixing nozzle through the mixing nozzle,
Wherein the introduction of the resin mixture into the cavity is performed to substantially fill the space between the individual conductors of the cable and the cable sheath by at least a portion of the cavity immediately adjacent the inner seal portion and the terminal end of the cable sheath Lt; RTI ID = 0.0 > substantially < / RTI >
How to Install a Barrier Cable Gland.

The method according to claim 1,
Wherein the interior of the cable gland has an open end spaced apart from the compression seal.

3. The method of claim 2,
The cavity being substantially filled with the resin mixture to an open end of the cavity so as to form a solid plug of hardened resin extending from the compression seal to the open end in front of the inner tubular body of the cable gland, How to Install a Barrier Cable Gland.

The method according to claim 1,
Wherein the double syringe comprises epoxy resin components for producing an epoxy resin.

The method according to claim 1,
The tubular extension of the smaller cross-section is attached to the discharge end of the mixing nozzle to facilitate introduction of the liquid resin mixture between the individual conductors.

The method according to claim 1,
Said cable gland having an exterior or shielding clamp assembly,
The enclosure or shielding clamp assembly includes a clamping conical portion retained in engagement with the inner tubular body, and a clamping conical portion retained in engagement with the outer tubular body and threadedly fastening the inner tubular body to the outer tubular body And a cooperative clamping ring operatively urged into a cooperative relationship,
How to Install a Barrier Cable Gland.

The method according to claim 6,
Said cable gland having an outer compression seal coupled to said cable gland for sealing an outer surface of an outer electrically insulative shell of said electrical cable,
The compression seal forming an inner compression seal for sealing the outer surface of the inner electrically insulating sheath of the cable,
How to Install a Barrier Cable Gland.

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An outer tubular body or union nut having a free end forming an entry end for the cable and an outer tubular body or an installed tubular body having an inner tubular body having an outer threaded thread portion cooperating with the inner screw thread portion of the union nut In the land,
The two bodies form an internal cavity,
Wherein a portion of the inner cavity is defined by a cylindrical inwardly facing surface of the inner tubular body,
The cylindrical inwardly facing surface surrounding a plurality of discrete electrically insulated conductors extending outside the cable enclosure surrounding the electrically insulated conductor,
Said cylindrical inwardly facing surface having a release layer or film applied to said cylindrical inwardly facing surface,
Wherein the cable gland has a compression seal that seals the outer surface of the cable sheath at a location between the ends of the cable gland,
Wherein a cured plug of the resin is located immediately adjacent the compression seal and occupies at least a portion of the cavity formed by the inwardly facing surface of the inner tubular body of the cable gland,
Installed cable gland.

10. The method of claim 9,
The plug of the resin is transparent so that the installed cable gland can be easily inspected and the space in the plug of the resin and air pockets can be observed.

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