WO2010094978A1 - Insulating member - Google Patents

Insulating member Download PDF

Info

Publication number
WO2010094978A1
WO2010094978A1 PCT/GB2010/050296 GB2010050296W WO2010094978A1 WO 2010094978 A1 WO2010094978 A1 WO 2010094978A1 GB 2010050296 W GB2010050296 W GB 2010050296W WO 2010094978 A1 WO2010094978 A1 WO 2010094978A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating member
threaded
connecting members
insulating
axis
Prior art date
Application number
PCT/GB2010/050296
Other languages
French (fr)
Inventor
Geof Mood
Original Assignee
British Engines Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Engines Limited filed Critical British Engines Limited
Publication of WO2010094978A1 publication Critical patent/WO2010094978A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
    • H02G3/0616—Joints for connecting tubing to casing
    • H02G3/0625—Joints for connecting tubing to casing with means for preventing disengagement of conductors
    • H02G3/0641—Joints for connecting tubing to casing with means for preventing disengagement of conductors with means distorted around the conductors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/02—Electrically insulating joints or couplings
    • F16L25/021—Electrically insulating joints or couplings for screw-threaded joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
    • F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies

Definitions

  • the present invention relates to an insulating member, and relates particularly but not exclusively, to an insulating member for electrically insulating a first connecting member from a second connecting member.
  • Insulated adaptors are commonly used to connect cable glands, etc to metal enclosures that they have to be electrically insulated from. There are several ways to achieve this insulation where the connection to the enclosure is via a clearance hole, but in applications where the entry to the enclosure is a threaded hole it is more difficult.
  • the normal method of insulating a cable gland from the enclosure it is fastened to is to use a plastic adaptor which is connected between two metal adaptors.
  • An example of an adaptor of the prior art is shown in figure 1.
  • the adaptor 100 is moulded to a first connecting member 102 having a threaded outer surface, which is in engagement with a second connecting member 104 having an internally threaded surface.
  • Figure 2 illustrates another known way of insulating cable glands.
  • Figure 2 shows an insulated adaptor arrangement 200 having first and second connecting members 202, 204 with threaded inner and outer surface portions 206, 208 respectively.
  • Figure 2 also illustrates an insulating member 210, which is commonly made of plastic, with threaded inner and outer surface portions 212, 214 which are correspondingly threaded so as to engage connecting members 204, 202.
  • the surfaces defined by the inner and outer surface portions 212, 214 of the insulating member 210 are parallel and are displaced from one another along the length of an axis 213 extending in a direction parallel to the surfaces defined by the surface portions 212, 214.
  • each connecting member 202 , 204 When each connecting member 202 , 204 is threadably engaged by the respective threaded surfaces 214, 212 of the insulating member 210, the extent to which the connecting members and insulating member are engaged may be easily increased until the abutment portion 216 of connecting member 202 engages flange 218 and the abutment portion 220 engages flange 222. Over tightening of the connecting members is easy and can result in crossed or stripped threads on the insulating member 210.
  • the insulated adaptor arrangement 200 is long, it is more vulnerable to damage and less likely to pass an impact test for hazardous area certification.
  • Preferred embodiments of the present invention seek to overcome the above disadvantages of the prior art.
  • an insulating member for insulating a first connecting member from a second connecting member, said insulating member comprising: a body having :- an at least partially threaded outer surface adapted to engage a correspondingly threaded surface of a first connecting member, said threaded outer surface defining a first axis; and at least one aperture extending coaxially with said first axis at least partially through said body, thereby defining an inner surface, said inner surface also being at least partially threaded and adapted to engage a correspondingly threaded surface of a second connecting member; wherein said threaded portions of said inner and said outer surface at least partially overlap in the direction of said first axis.
  • Threadably engaging connecting members to an insulating member such that the connecting members are held out of contact with one another and oppositely adjacent each other provides the advantages that without decreasing the amount of insulation between the connecting members, the reliability of the connection between the connecting members is increased. Furthermore, the connection between two connecting members is shorter, and is therefore less vulnerable to damage and more likely to pass an impact test for hazardous area certification .
  • the insulating member is sandwiched between the connecting members it can take a much higher tightening torque than other screwed together insulated adaptors. This is because the threads of the insulating member are held on both sides by the connecting members and as a result it can move neither inwards nor outwards.
  • the over tightening of the connecting member with a threaded portion that extends into the insulating member will cause the insulating member extending around the connecting member to move radially outwards which leads to jumping of the threads.
  • the inner - A - threaded portion of the other connecting member prevents any radially outward movement of the insulating member. Similarly inward radial movement of the insulating member is prevented.
  • the insulating member may further comprise at least one first flange portion extending from said outer surface.
  • the insulating member may further comprise at least one second flange portion extending from said inner surface.
  • said insulating member is made at least partially from plastic.
  • said insulating member has a thermal and/or electrical conductivity, smaller than that of both said first and said second connecting members.
  • an insulated adaptor comprising: an insulating member as set out above; and first and second threaded connecting members so adapted to threadably engage said insulating member; wherein said insulating member is adapted to retain said first and said second connecting members in place such that they partially overlap in the direction of said first axis.
  • Figure 1 illustrates a cross sectional diagram of a first insulated adaptor arrangement of the prior art
  • Figure 2 illustrates a cross sectional diagram of a second insulated adaptor arrangement of the prior art
  • Figure 3 illustrates a cross sectional diagram of an insulated adaptor arrangement according to the present invention.
  • Figure 4 illustrates a cross sectional diagram of two connected components of the arrangement in figure 3.
  • an insulated adaptor 300 has first and second connecting members 302, 304, typically made from metal, with threaded inner and outer surface portions 306, 308 respectively.
  • the insulated adaptor 300 also includes an insulating member 310, which is typically but not necessarily made from plastic, with threaded inner and outer surface portions 312, 314. These surfaces 312 and 314 are correspondingly threaded so as to respectively engage connecting members 304, 302.
  • the surfaces defined by the inner and outer surface portions 312, 314 of the insulating member 310 are parallel and overlap each other along the length of an axis 313 extending along a direction parallel to the surfaces so defined by the surface portions 312, 314.
  • each connecting member 302, 304 is threadably engaged by the respective threaded surfaces 314, 312 of the insulating member 310, the extent to which the connecting members and insulating member are engaged may be easily increased until the abutment potion 316 of connecting member 302 engages flange 318 and the abutment portion 320 of connecting member 304 engages flange 322. If the extent with which either the first or second connecting member 302, 304 are threadably engaged with the insulating member 310 increases beyond such an extent, strain is introduced into the engaging threads of the over tightened members.
  • the likelihood of the engaging threads jumping or stripping is significantly reduced as compared to those in the prior art because the insulating member 310 is sandwiched between the connecting members 302, 304. As a result, it can take a much higher tightening torque before the engaging threads jump or strip because the threads of the insulating member 310 are held on opposing sides by the connecting members 302, 304. Therefore, the portions of the insulating member which are threadably engaged between oppositely adjacent connecting members 302, 304 can move neither inwards nor outwards. This increases the grip of the insulating member 310 on the first and second connecting members 302, 304 thereby increasing the reliability of the connection between the connecting members 302, 304.
  • the length of the insulated adaptor arrangement 300 is reduced compared to that of the cable gland arrangement 200 of the prior art shown in figure 2. This makes the insulated adaptor arrangement 300 less vulnerable to damage and more likely to pass an impact test for hazardous area certification.
  • An insulated adaptor arrangement 300 of the type illustrated in figure 3 is much stronger than the equivalent prior art in figures 1 and 2 and is also much shorter. Such an insulated adaptor arrangement 300 however still performs to the same standards as the prior art in terms of insulating properties because the minimum distance between the connecting members 302, 304 can be maintained.
  • Figure 4 illustrates an insulation member 310 which has been fixedly engaged with a connecting member 302 by applying an adhesive to the threads of either member before bringing them into threaded engagement with one another. This further reduces the likelihood of jumping or stripping of the threads between these two members.
  • the insulating member 310 may thermally and/or electrically insulate the two connecting members 302 and 304.
  • the insulating member may be made from any material having a thermal and/or electrical conductivity which is smaller than that of either of the first and said second connecting members 302, 304.
  • 302 and 304 could be made from brass and the insulating member could be made from nylon.
  • connection between either connecting member 302, 304 and the insulating member 310 may be fitted with a gasket.
  • adhesive may be applied to the threads of either connecting member 302, 304 or the insulating member 310 before bringing them into threaded engagement with each other .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Insulating Bodies (AREA)

Abstract

An insulating member (310) for electrically and thermally insulating a first connecting member (302) from a second connecting member (304) is herein described. Such an insulating member has a body with a threaded outer surface which defines a first axis and is adapted to engage a correspondingly threaded surface of a first connecting member. The body also has an aperture extending therethrough along the direction of the first axis, thereby defining an inner surface, which is also threaded and adapted to engage a correspondingly threaded surface of a second connecting member. The threaded portions of the inner and the outer surface partially overlap in the direction of the first axis.

Description

Insulating Member
The present invention relates to an insulating member, and relates particularly but not exclusively, to an insulating member for electrically insulating a first connecting member from a second connecting member.
Insulated adaptors are commonly used to connect cable glands, etc to metal enclosures that they have to be electrically insulated from. There are several ways to achieve this insulation where the connection to the enclosure is via a clearance hole, but in applications where the entry to the enclosure is a threaded hole it is more difficult. The normal method of insulating a cable gland from the enclosure it is fastened to is to use a plastic adaptor which is connected between two metal adaptors. An example of an adaptor of the prior art is shown in figure 1. The adaptor 100 is moulded to a first connecting member 102 having a threaded outer surface, which is in engagement with a second connecting member 104 having an internally threaded surface.
Figure 2 illustrates another known way of insulating cable glands. Figure 2 shows an insulated adaptor arrangement 200 having first and second connecting members 202, 204 with threaded inner and outer surface portions 206, 208 respectively. Figure 2 also illustrates an insulating member 210, which is commonly made of plastic, with threaded inner and outer surface portions 212, 214 which are correspondingly threaded so as to engage connecting members 204, 202. The surfaces defined by the inner and outer surface portions 212, 214 of the insulating member 210 are parallel and are displaced from one another along the length of an axis 213 extending in a direction parallel to the surfaces defined by the surface portions 212, 214.
When each connecting member 202 , 204 is threadably engaged by the respective threaded surfaces 214, 212 of the insulating member 210, the extent to which the connecting members and insulating member are engaged may be easily increased until the abutment portion 216 of connecting member 202 engages flange 218 and the abutment portion 220 engages flange 222. Over tightening of the connecting members is easy and can result in crossed or stripped threads on the insulating member 210.
Furthermore, because the insulated adaptor arrangement 200 is long, it is more vulnerable to damage and less likely to pass an impact test for hazardous area certification.
Preferred embodiments of the present invention seek to overcome the above disadvantages of the prior art.
According to an aspect of the present invention there is provided an insulating member for insulating a first connecting member from a second connecting member, said insulating member comprising: a body having :- an at least partially threaded outer surface adapted to engage a correspondingly threaded surface of a first connecting member, said threaded outer surface defining a first axis; and at least one aperture extending coaxially with said first axis at least partially through said body, thereby defining an inner surface, said inner surface also being at least partially threaded and adapted to engage a correspondingly threaded surface of a second connecting member; wherein said threaded portions of said inner and said outer surface at least partially overlap in the direction of said first axis.
By providing threaded portions on the inner and outer surface of an insulating member, which overlap in the direction of an axis, allows connecting members threadably engaged with the respective inner and outer surfaces of the insulating member to also overlap in the direction of the axis. Threadably engaging connecting members to an insulating member such that the connecting members are held out of contact with one another and oppositely adjacent each other, provides the advantages that without decreasing the amount of insulation between the connecting members, the reliability of the connection between the connecting members is increased. Furthermore, the connection between two connecting members is shorter, and is therefore less vulnerable to damage and more likely to pass an impact test for hazardous area certification .
Because the insulating member is sandwiched between the connecting members it can take a much higher tightening torque than other screwed together insulated adaptors. This is because the threads of the insulating member are held on both sides by the connecting members and as a result it can move neither inwards nor outwards. For example, in the prior art the over tightening of the connecting member with a threaded portion that extends into the insulating member will cause the insulating member extending around the connecting member to move radially outwards which leads to jumping of the threads. However, in the present invention the inner - A - threaded portion of the other connecting member prevents any radially outward movement of the insulating member. Similarly inward radial movement of the insulating member is prevented.
The insulating member may further comprise at least one first flange portion extending from said outer surface.
The insulating member may further comprise at least one second flange portion extending from said inner surface.
In a preferred embodiment said insulating member is made at least partially from plastic.
In another preferred embodiment said insulating member has a thermal and/or electrical conductivity, smaller than that of both said first and said second connecting members.
This provides the advantage of maximizing the efficiency of thermal and/or electrical insulation between two connecting members.
According to another aspect of the present invention there is provided an insulated adaptor comprising: an insulating member as set out above; and first and second threaded connecting members so adapted to threadably engage said insulating member; wherein said insulating member is adapted to retain said first and said second connecting members in place such that they partially overlap in the direction of said first axis.
Preferred embodiments of the invention will now be described, by way of example only and not in any limitative sense, with reference to the accompanying drawings in which:- ™- o —
Figure 1 illustrates a cross sectional diagram of a first insulated adaptor arrangement of the prior art;
Figure 2 illustrates a cross sectional diagram of a second insulated adaptor arrangement of the prior art;
Figure 3 illustrates a cross sectional diagram of an insulated adaptor arrangement according to the present invention; and
Figure 4 illustrates a cross sectional diagram of two connected components of the arrangement in figure 3.
Referring to Figure 3, an insulated adaptor 300 has first and second connecting members 302, 304, typically made from metal, with threaded inner and outer surface portions 306, 308 respectively. The insulated adaptor 300 also includes an insulating member 310, which is typically but not necessarily made from plastic, with threaded inner and outer surface portions 312, 314. These surfaces 312 and 314 are correspondingly threaded so as to respectively engage connecting members 304, 302. The surfaces defined by the inner and outer surface portions 312, 314 of the insulating member 310 are parallel and overlap each other along the length of an axis 313 extending along a direction parallel to the surfaces so defined by the surface portions 312, 314.
When each connecting member 302, 304 is threadably engaged by the respective threaded surfaces 314, 312 of the insulating member 310, the extent to which the connecting members and insulating member are engaged may be easily increased until the abutment potion 316 of connecting member 302 engages flange 318 and the abutment portion 320 of connecting member 304 engages flange 322. If the extent with which either the first or second connecting member 302, 304 are threadably engaged with the insulating member 310 increases beyond such an extent, strain is introduced into the engaging threads of the over tightened members.
However, the likelihood of the engaging threads jumping or stripping is significantly reduced as compared to those in the prior art because the insulating member 310 is sandwiched between the connecting members 302, 304. As a result, it can take a much higher tightening torque before the engaging threads jump or strip because the threads of the insulating member 310 are held on opposing sides by the connecting members 302, 304. Therefore, the portions of the insulating member which are threadably engaged between oppositely adjacent connecting members 302, 304 can move neither inwards nor outwards. This increases the grip of the insulating member 310 on the first and second connecting members 302, 304 thereby increasing the reliability of the connection between the connecting members 302, 304.
Furthermore, because inner and outer surface portions 312, 314 of the insulating member 310 overlap with one another along the length of axis 313, the length of the insulated adaptor arrangement 300 is reduced compared to that of the cable gland arrangement 200 of the prior art shown in figure 2. This makes the insulated adaptor arrangement 300 less vulnerable to damage and more likely to pass an impact test for hazardous area certification.
An insulated adaptor arrangement 300 of the type illustrated in figure 3 is much stronger than the equivalent prior art in figures 1 and 2 and is also much shorter. Such an insulated adaptor arrangement 300 however still performs to the same standards as the prior art in terms of insulating properties because the minimum distance between the connecting members 302, 304 can be maintained.
Figure 4 illustrates an insulation member 310 which has been fixedly engaged with a connecting member 302 by applying an adhesive to the threads of either member before bringing them into threaded engagement with one another. This further reduces the likelihood of jumping or stripping of the threads between these two members.
The insulating member 310 may thermally and/or electrically insulate the two connecting members 302 and 304. As a result the insulating member may be made from any material having a thermal and/or electrical conductivity which is smaller than that of either of the first and said second connecting members 302, 304. For example 302 and 304 could be made from brass and the insulating member could be made from nylon.
It will be appreciated by persons skilled in the art that the above embodiments have been described by way of example only and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims. For example, the connection between either connecting member 302, 304 and the insulating member 310 may be fitted with a gasket. Furthermore, adhesive may be applied to the threads of either connecting member 302, 304 or the insulating member 310 before bringing them into threaded engagement with each other .

Claims

CIiAIMS
1. An insulating member for insulating a first connecting member from a second connecting member, said insulating member comprising: a body having :- an at least partially threaded outer surface adapted to engage a correspondingly threaded surface of a first connecting member, said threaded outer surface defining a first axis; and at least one aperture extending coaxially with said first axis at least partially through said body, thereby defining an inner surface, said inner surface also being at least partially threaded and adapted to engage a correspondingly threaded surface of a second connecting member; wherein said threaded portions of said inner and said outer surface at least partially overlap in the direction of said first axis.
2. An insulating member according to claim 1, further comprising at least one first flange portion extending from said outer surface.
3. An insulating member according to claim 1 or 2, further comprising at least one second flange portion extending from said inner surface.
4. An insulating member according to any of the preceding claims, wherein said insulating member is made at least partially from plastic.
5. An insulating member according to any of the preceding claims, wherein said insulating member has a thermal and/or electrical conductivity, smaller than that of both said first and said second connecting members.
6. An insulating member as substantially herein described with reference to the drawings in figures 3 and 4.
7. An insulated adaptor comprising: an insulating member according to any of the preceding claims; and first and second threaded connecting members so adapted to threadably engage said insulating member; wherein said insulating member is adapted to retain said first and said second connecting members in place such that they partially overlap in the direction of said first axis.
8. An insulated adaptor as substantially herein described with reference to the accompanying drawing in figure 3.
PCT/GB2010/050296 2009-02-23 2010-02-22 Insulating member WO2010094978A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0902991A GB0902991D0 (en) 2009-02-23 2009-02-23 Insulating member
GB0902991.9 2009-02-23

Publications (1)

Publication Number Publication Date
WO2010094978A1 true WO2010094978A1 (en) 2010-08-26

Family

ID=40565533

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2010/050296 WO2010094978A1 (en) 2009-02-23 2010-02-22 Insulating member

Country Status (2)

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GB (1) GB0902991D0 (en)
WO (1) WO2010094978A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2972516A4 (en) * 2013-03-14 2016-11-09 Sharewell Energy Services Llc Composite isolation joint for gap sub or internal gap

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1280144A (en) * 1968-09-20 1972-07-05 Hawke Cable Glands Ltd Improvements in or relating to electric cable glands
US20040206510A1 (en) * 2001-06-30 2004-10-21 Simon Fraser Insulating device and assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1280144A (en) * 1968-09-20 1972-07-05 Hawke Cable Glands Ltd Improvements in or relating to electric cable glands
US20040206510A1 (en) * 2001-06-30 2004-10-21 Simon Fraser Insulating device and assembly

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PEPPERS CABLE GLANDS LIMITED: "Accessories: Insulating Adaptors Type IA", 1 January 2008 (2008-01-01), XP002577758, Retrieved from the Internet <URL:http://www.cableglands.com/pdf/page_713_ia.pdf> [retrieved on 20100414] *
PEPPERS CABLE GLANDS LIMITED: "Accessories: Nylon Adaptors and Reducers - Type ARN", 1 January 2008 (2008-01-01), XP002577757, Retrieved from the Internet <URL:http://www.cableglands.com/pdf/page_712_arn.pdf> [retrieved on 20100414] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2972516A4 (en) * 2013-03-14 2016-11-09 Sharewell Energy Services Llc Composite isolation joint for gap sub or internal gap
US10221632B2 (en) 2013-03-14 2019-03-05 Ge Energy Oilfield Technology, Inc Composite isolation joint for gap sub or internal gap

Also Published As

Publication number Publication date
GB0902991D0 (en) 2009-04-08

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