GB2109272A - Magnetic drain plugs - Google Patents

Magnetic drain plugs Download PDF

Info

Publication number
GB2109272A
GB2109272A GB08132081A GB8132081A GB2109272A GB 2109272 A GB2109272 A GB 2109272A GB 08132081 A GB08132081 A GB 08132081A GB 8132081 A GB8132081 A GB 8132081A GB 2109272 A GB2109272 A GB 2109272A
Authority
GB
United Kingdom
Prior art keywords
magnetic
plug
tip
drain plug
engine
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB08132081A
Inventor
Kenneth Proctor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sangamo Weston Ltd
Atos Origin IT Services Inc
Original Assignee
Sangamo Weston Ltd
Sangamo Weston Inc
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 Sangamo Weston Ltd, Sangamo Weston Inc filed Critical Sangamo Weston Ltd
Priority to GB08132081A priority Critical patent/GB2109272A/en
Publication of GB2109272A publication Critical patent/GB2109272A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/28—Magnetic plugs and dipsticks
    • B03C1/286—Magnetic plugs and dipsticks disposed at the inner circumference of a recipient, e.g. magnetic drain bolt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
    • F01M2001/1028—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification
    • F01M2001/1042—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification comprising magnetic parts

Landscapes

  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

A magnetic drain plug for monitoring wear of oil-lubricated iron or steel moving parts in a gas-turbine engine by attracting wear particles from the oil, has a magnetic material 16, which may be of high coercivity, disposed within a non-magnetic protective sheath 18, e.g. of stainless steel. Thus the risk of damage and chipping of the magnetic tip is reduced. <IMAGE>

Description

SPECIFICATION Magnetic drain plugs This invention relates to magnetic drain plugs.
In order to permit the wear of oil-lubricated iron or steel moving parts to be monitored, in for example a gas-turbine engine, it is well known to provide a drain plug for the oil lubrication system with a magnetic tip. Iron or steel (ferromagnetic) particles released into the circulating oil as a result of wear processes will tend to be magnetically attracted and held by the magnetic tip of the drain plug. Thus visual examination of the surface of the drain plug enables a simple check on the existence and extent of wear in the engine to be made. In addition, retention of wear particles by the magnetic tip prevents their continued circulation in the oil and reduces the risk of their causing damage elsewhere in the engine.
However, the magnetic materials currently used for drain plug tips have limited physical strength and have a tendency to fracture and chip. Consequently they can themselves release fragments into the lubrication system and also cause damage.
According to one aspect of this invention there is provided a magnetic drain plug for an engine lubrication system, wherein the magnetic material is disposed within a non-magnetic protective sheath.
Typically the magnetic tip is enclosed within a closed tube of stainless steel selected to be nonmagnetic so as not to disturb the function of the magnetic tip. An example of a suitable material is stainless steel to BS 316 S12.
Any magnetic material currently used for the tip of a magnetic drain plug can be used. However, in addition it is also practicable to use high-coercivity materials (such as samarium-cobalt, Hycomax (Trade Mark) or columnar single crystals), which are desirable for open-pole configurations such as that of a magnetic drain plug, but which tend to be brittle and thus prone to chipping as mentioned above.
An example of a magnetic drain plug in accordance with this invention is shown in the accompanying drawing. The plug has a hexagonal head 10 and a flange 12, below which is a threaded portion 14 to engage in the wall of an engine housing. A rod 16 of magnetic material extends from the end of the threaded portion 14 and is enclosed in a stainless steel sheath 18. The sheath 18 may be a closed tube as shown or alternatively an open-ended cylinder. If a high-coercivity material is used for the magnetic probe tip, the diameter of the probe tip can be reduced in comparison to conventional designs, thereby making is easierforthe plug to be withdrawn from an engine for inspection without disturbing the sample of wear particles on the probe tip.
It is envisaged that the invention can also be applied to magnetic drain plugs of the self-sealing kind, in which a spring-loaded valve in the socket receiving the plug automatically closes the socket upon withdrawal of the plug for inspection.
CLAIMS (Filed on 15 Oct 1982) 1. A magnetic drain plug for an engine lubrication system, wherein the magnetic material is disposed within a non-magnetic protective sheath.
2. A plug according to claim 1, wherein the magnetic material is disposed within a tube of stainless steel selected to be non-magnetic.
3. A plug according to claim 2, wherein the tube is closed.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Magnetic drain plugs This invention relates to magnetic drain plugs. In order to permit the wear of oil-lubricated iron or steel moving parts to be monitored, in for example a gas-turbine engine, it is well known to provide a drain plug for the oil lubrication system with a magnetic tip. Iron or steel (ferromagnetic) particles released into the circulating oil as a result of wear processes will tend to be magnetically attracted and held by the magnetic tip of the drain plug. Thus visual examination of the surface of the drain plug enables a simple check on the existence and extent of wear in the engine to be made. In addition, retention of wear particles by the magnetic tip prevents their continued circulation in the oil and reduces the risk of their causing damage elsewhere in the engine. However, the magnetic materials currently used for drain plug tips have limited physical strength and have a tendency to fracture and chip. Consequently they can themselves release fragments into the lubrication system and also cause damage. According to one aspect of this invention there is provided a magnetic drain plug for an engine lubrication system, wherein the magnetic material is disposed within a non-magnetic protective sheath. Typically the magnetic tip is enclosed within a closed tube of stainless steel selected to be nonmagnetic so as not to disturb the function of the magnetic tip. An example of a suitable material is stainless steel to BS 316 S12. Any magnetic material currently used for the tip of a magnetic drain plug can be used. However, in addition it is also practicable to use high-coercivity materials (such as samarium-cobalt, Hycomax (Trade Mark) or columnar single crystals), which are desirable for open-pole configurations such as that of a magnetic drain plug, but which tend to be brittle and thus prone to chipping as mentioned above. An example of a magnetic drain plug in accordance with this invention is shown in the accompanying drawing. The plug has a hexagonal head 10 and a flange 12, below which is a threaded portion 14 to engage in the wall of an engine housing. A rod 16 of magnetic material extends from the end of the threaded portion 14 and is enclosed in a stainless steel sheath 18. The sheath 18 may be a closed tube as shown or alternatively an open-ended cylinder. If a high-coercivity material is used for the magnetic probe tip, the diameter of the probe tip can be reduced in comparison to conventional designs, thereby making is easierforthe plug to be withdrawn from an engine for inspection without disturbing the sample of wear particles on the probe tip. It is envisaged that the invention can also be applied to magnetic drain plugs of the self-sealing kind, in which a spring-loaded valve in the socket receiving the plug automatically closes the socket upon withdrawal of the plug for inspection. CLAIMS (Filed on 15 Oct 1982)
1. A magnetic drain plug for an engine lubrication system, wherein the magnetic material is disposed within a non-magnetic protective sheath.
2. A plug according to claim 1, wherein the magnetic material is disposed within a tube of stainless steel selected to be non-magnetic.
3. A plug according to claim 2, wherein the tube is closed.
GB08132081A 1981-10-23 1981-10-23 Magnetic drain plugs Withdrawn GB2109272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08132081A GB2109272A (en) 1981-10-23 1981-10-23 Magnetic drain plugs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08132081A GB2109272A (en) 1981-10-23 1981-10-23 Magnetic drain plugs

Publications (1)

Publication Number Publication Date
GB2109272A true GB2109272A (en) 1983-06-02

Family

ID=10525369

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08132081A Withdrawn GB2109272A (en) 1981-10-23 1981-10-23 Magnetic drain plugs

Country Status (1)

Country Link
GB (1) GB2109272A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210295A (en) * 1987-09-30 1989-06-07 Ishikawa Tekko Kk Magnetic drain bolt
WO1990013769A1 (en) * 1989-05-04 1990-11-15 University College Of Swansea Removal of debris
GB2232098A (en) * 1989-05-04 1990-12-05 Univ Swansea Magnetic removal of debris
WO2019200761A1 (en) * 2018-04-20 2019-10-24 韩秀勤 Bolt for removing iron filings

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210295A (en) * 1987-09-30 1989-06-07 Ishikawa Tekko Kk Magnetic drain bolt
WO1990013769A1 (en) * 1989-05-04 1990-11-15 University College Of Swansea Removal of debris
GB2232098A (en) * 1989-05-04 1990-12-05 Univ Swansea Magnetic removal of debris
GB2232098B (en) * 1989-05-04 1993-06-30 Univ Swansea Removal of debris
WO2019200761A1 (en) * 2018-04-20 2019-10-24 韩秀勤 Bolt for removing iron filings

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)