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Publication numberUS3721948 A
Publication typeGrant
Publication dateMar 20, 1973
Filing dateMar 2, 1972
Priority dateMar 2, 1972
Also published asDE2309825A1, DE2309825C2
Publication numberUS 3721948 A, US 3721948A, US-A-3721948, US3721948 A, US3721948A
InventorsG Brandt, J Hague
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Terminal assembly
US 3721948 A
Abstract
An electric terminal assembly, particularly for heremetic compressors, comprising a plurality of conductor pins extending through a metal body member and secured thereto by glass-to-metal seals is provided with sleeves of insulating material surrounding the pins and a body of resinous material anchoring the sleeves to the body member and covering the glass seals.
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Description  (OCR text may contain errors)

United States Patent [1 1 Brandt et al. I

1March 20, 1973 1 TERMINAL ASSEMBLY [75] 'lnventors: George W. Brandt; Joe T. Hague, both of Tyler, Tex.

[73] Assignee: Generali Electric I Louisville, Ky.

[22] Filed: March 2, 1972 [21] Appl. No.: 231,179

Company,

[52] US. Cl ..339/l76 R, 174/152 GM, 339/218 R [51] Int. Cl. ..H0lb 17/26 [58] Field of-Search.174/50.59, 152 GM; 339/126 R, 339/126 .1, 136, 144, 156, 176 R, 176 M,

[56] References Cited UNITED STATES PATENTS 3,160,460 12/1964 Wyzenbeek ..339/176R 9/1969 McManus ....339/l96 M 3,551,191 12/1970 Elbling et al. ..1 17/229 FOREIGN PATENTS OR APPLICATIONS 1,152,169 8/1963 Germany ..l74/l52 GM Primary Examiner-Marvin A. Champion Assistant Examiner-Lawrence J. Staab Att0meyWalter E. Rule et al.

[5 7] I ABSTRACT An electric terminal assembly, particularly for heremetic compressors, comprising a plurality of conductor pins extending through a metal body member and secured thereto by glass-to-metal seals is provided with sleeves of insulating material surrounding the. pins and a body of resinous material anchoring the sleeves to the body member and covering the glass seals.

6 Claims, 3 Drawing Figures PATENTEU MR 2 01973 F'lG.l

F'IGB TERMINAL ASSEMBLY BACKGROUND OF THE INVENTION Current terminal assemblies for making electrical 2 connection to the motor component of a hermetic motor compressor unit include a plurality ofconductor pins projecting through spaced apertures in a metal body portion and hermetically sealed thereto by glass-- unit as part of a refrigeration system, metallic particles a partial decomposition of the halogenated hydrocarbon refrigerant, may also directly attack the glass surfaces causing or contributing to the electrical breakdown.

For the purpose of preventing failures of the terminals through disintegration of the glass US. Pat. No. 3,55l,l9l-Elbling et al. proposes coating at least the glass bead or bushing portions of the terminals with an impervious coating of an epoxy resin. While such a coating does protect the glass surfaces and prevent deterioration thereof by acidic disintegration, it does not materially decrease the potential tracking distances between terminals or prevent metallic particles from being attracted to the vicinity of the terminals with the formation of short circuiting electrically conductive paths.

It is a general object of the present invention to provide a simple and effective means for preventing short circuiting and terminal failure of glass-to-metal seal terminal assemblies.

It is a more specific object of the present invention to provide a multiple conductor pin terminal assembly including simple and low cost means for substantially increasing the over-surface distances between the terminals and the terminals and ground.

SUMMARY OF THE INVENTION In accordance with the illustrated embodiment of the present invention, there is provided an electric terminal assembly including a metal body member adapted to be mounted on a wall of a hermetic compressor unit, this body member having a plurality of spaced apertures therein. Metal conductor pins project through these apertures and insulating glass seals are provided for hermetically sealing the pins toadjacent portions of the body member. In order to prevent contaminants within the compressor casing from establishing an electrical conductive path between terminals which could result in a short circuit causing terminal failure, sleeves of flexible insulating material are provided which surround each of the terminals in spaced relationship thereto, these sleeves being anchored to the body member by means ofa resinous material partially filling the sleeves and covering the surfaces of the glass seals. In accordance with the preferred embodiment of the invention these sleeves are contained within an outer tubular member of insulating material surrounding and in spaced relationship to all of the terminals.

BRIEF DESCRIPTION OF THE DRAWING In the accompanying drawing:

FIG. 1 is a side viewof a terminal assembly incorporating the present invention as insta iled in a hermetic compressor casing wall;

FIG. 2 is an isometric view of a terminal assembly of the present invention; and

FIG. 3 is a sectional view of the terminal assembly taken generally along line 33 of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT The terminal assembly of the present invention, generally indicated by the number 1 in FIG. 1, is intended to be installed in an aperture in a wall 2 of a hermetic compressor unit represented diagrammatically by the broken lines 3. It will of course be understood that the casing contains amotor compressor unit forming part of a refrigeration system so that it also contains a refrigerant and oil atmosphere.

The terminal assembly 1 provides means for furnishing electrical power to the motor component of the compressor unit through conductor pins or leads 4, 5 and 6, three such leads or pins being required for a capacitor-start, capacitor-run motor, a permanent split-capacitor motor or a three-phase motor.

The terminal assembly thus far described is of the general structure illustrated for example in Wyzenbeek US. Pat. No. 3,160,460. This basic structure forming the background for the present invention comprises, as shown in FIGS. 2 and 3 of the drawing, a metal body member 7 including a flat end wall 8 bounded by a cylindrical side wall 9 terminating in a mountingflange 10 which can be welded to the compressor case 2. The end wall 8 of the body member 7 includes three inwardly extending collars ll defining a plurality of spaced apertures 12 for respectively receiving the conductor pins 4, 5 and 6. These conductor pins are secured to the body and electrically insulated therefrom by means of glass beads or bushings 14 which is tired to effect a glass-to-metal seal between the pins and the collars 1 1 In many commercially available terminal assemblies, the portion of the glass seal on the inner side of the terminal assembly is somewhat cone shaped as indicated by the numeral 15 or, in other words, extends somewhat inwardly from the inner ends of the collars l I.

It has been found that such commercially available terminal assemblies for hermetic motor compressor units lack sufficient electrical terminal spacing as provided by the glass seals. During operation of the motor compressor, metallic particles present within the hermetic casing are attracted to the vicinity of the terminals and particularly to the exposed surfaces of the glass insulating beads and build upon the surface of the glass to a point that one or more electrical conductive paths are established between the conductor pins or the pins and the grounded inner surfaces of the body member 7. The minimum conducting path has a length equal to the shortest distance between an exposed or uninsulated portion of conductor pin and the adjacent portion of the body member 8 or, more specifically, a collar 11 surrounding a pin.

While the application of an insulating and protective coating to the inner surfaces of the terminal assembly, as proposed in the aforementioned US. Pat. No. 3,551 ,l9l, serves to protect the exposed glass surfaces from acidic attack and also lengthens the possible conductive paths formed by the collection of metallic particles to the surfaces between adjacent terminals or the terminals and the adjacent surfaces of the body member 8, such coatings have not completely solved the short circuiting problem, because over-surface spacing is not substantially increased and through air space is relatively unchanged. Cracking of the coating can occur during installation due to welding heat if the coating is in contact with side wall 9.

In accordance with the present invention, means are provided on the inner side of the terminal assembly for substantially increasing the over-surface spacing from electrically live to dead metal components of the assembly. This means comprises, as shown in FIGS. 2 and 3 of the drawing, electrically insulating sleeves 16 surrounding and in spaced relationship with each of the terminals 4, 5 and 6 and these sleeves, as shown in FIG. 3 of the drawing, extend from the end wall 8 of the body member 9 to a point slightly beyond the inner ends of the conductor pins. For anchoring these sleeves to the body 7 there is further provided a potting compound, such as an insulating epoxy resin compound, which is cured within these sleeves, this body of resinous material generally indicated by the numeral 17 filling the sleeves to a level such that it covers the inner surfaces of the glass beads 14.

In accordance with the preferred embodiment of the invention, the sleeves 16 are enclosed by and wedged within a tubular member 18 encompassing all of the terminal conductor pins 4, 5 and 6. This tubular member 18 also engages the end wall 8 of the body member 7 in slightly spaced relationship with the side walls 9 in order to position the sleeves and the resinous body 17 in spaced relationship to the portions of the side wall 9 which are to be welded to the casing wall 2. i

The body of resinous material 17 also fills the spaces between the sleeves and the tubular member 18 as shown in FIG. 3 of the drawing. Such spacing between sidewalls and tubular member provides additional over-surface spacing and helps prevent cracking of potting compound during installation in the casing 2.

With reference to FIG. 3 of the drawing, it will be seen that the sleeves 16 substantially increase the oversurface spacing between conductor pins 4, 5 and 6 and, in combination with 18, between these pins and the inner surface of the body member 7. This increased surface distance is supplied by the inner and outer surfaces of the exposed portions of the sleeves 16 and/or 18. In addition to providing an increased over-surface spacing between conducting parts of opposite polarity or different electrical potential, the sleeves which completely enclose the remaining exposed portions of the terminals 4, 5 and 6 also increase the through space distance between these terminals.

Preferably, both the tubular member 18 and the sleeve 16 are made of flexible polyethylene teraphthalate resin, such as DuPont Mylar, or other resinous material resistant to the environmental conditions 5 within the compressor case.

When the outer tubular member 18 is employed, a convenient method of manufacturing the assembly comprises positioning the tubular member 18 in spaced relationship with the side wall 9 and thereafter introducing the potting resin into the tubular member in the form of a thermosetting or heat curable powdered or liquid mass. Preferably the potging material is of the epoxy resin composition which can be introduced in liquid or powder form and thereafter cured in place to form a solid mass.

After the potting composition is introduced into the tubular member 18, the individual sleeves 16 are inserted and pressed downwardly through the potting compound into contact with the end wall 8.

Preferably these sleeves 16 initially of cylindrical shape are of a diameter of such that they are slightly deformed and wedged within the tubular member 18 in engagement with adjacent sleeves and with the tubular member. To facilitate assembly, the sleeves may first be positioned within a suitable tubular fixture having a diameter slightly smaller than the diameter of the tubular member 18 and slid from this fixture into the tubular member 18. After insertion of the sleeves 16, the entire assembly is heated to a temperature sufficient to cure the potting composition. After curing, the sleeves and tubular member are firmly bonded in place and the assembly is then ready to be mounted on the compressor case.

Accelerated life tests on the basic terminal assembly and such assemblies provided with the sleeves and potting compound have shown the reliability improvement of the terminals of the present invention. In these tests, twenty times the normal amount of metal chip compressor operation was added to the compressors before life testing was begun. Both locked rotor and running life tests were run. Results indicated significant improvement in terminal reliability when terminal physical clearances were increased. Whereas all four standard terminal assemblies failed within 300 hours of testing, all four of the improved terminal assemblies successfully completed 1,000 hours of testing. Similar results were recorded on the locked rotor life tests. Two standard terminal assemblies failed in three cycles or less while three compressors with the improved terminal assemblies cycled for 20 days completing approximately l,000 cycles without failure before testing was terminated.

From these tests, it is apparent that terminal assembly failures are the direct result of electrically conductive contaminants that bridge the small physical clearances between the current carrying pins and the grounded case. Since the contaminants are usually metallic particles, their quantity increases during the life of the compressor because loose wear particles from moving metallic compressor components are constantly fomied. Since such contaminant formation is inevitable, the physical clearances provided by the present invention within the terminal assembly provide effective means ofreducing the probability of forming conductive paths.

and powder contaminates resulting from 5 years of v While there has been shown and described a specific embodiment of the present invention it will be understood that it is not limited thereto and it is intended by the appended claims to cover all such modifications as fall within the true spirit and scope of the invention.

We claim:- Y v y 1. In an electric terminal comprising a cup-shaped metal body member including aside wall and an end wall having a plurality of spaced apertures therein, metal conductor pins projecting through said apertures and insulating glass seals hermetically sealing said pins to adjacent portions of said body member; the improvement comprising:

a tubular member of insulating material positioned in said cup-shaped member with one end thereon engaging said end wall, sleeves of insulating material surrounding and in spaced relationship with each of said pins within said tubular member,

and a body of resinous material cured in place within said tubular member and sleeves to anchor saidtubular member and sleeves to said terminals, said resinous material covering said glass seals. 2. An electric terminal according to claim 1 in which each of said sleeves are in contact with adjacent sleeves and with said tubular member.

3. An electric terminal according to claim 2 in which.

resin and said body of resinous material comprises an epoxy resin. I

6. An electric terminal according to claim 1 in which the tubular member spacing spaced from the side walls of the cup-shaped member.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3160460 *Jan 17, 1962Dec 8, 1964Fusite CorpTerminal assembly having conductor pins and connector block
US3465284 *May 5, 1965Sep 2, 1969Physical Sciences CorpMultipin connector
US3551191 *Oct 17, 1967Dec 29, 1970Westinghouse Electric CorpHermetic compressor terminal coating
DE1152169B *Apr 8, 1960Aug 1, 1963Siemens AgDruckglasdurchfuehrung fuer das metallische Gehaeuse elektrischer Kondensatoren oder anderer elektrischer Bauelemente
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3850496 *Jun 28, 1973Nov 26, 1974Gen ElectricConnector block for hermetic motor compressor
US4059325 *Dec 13, 1976Nov 22, 1977General Electric CompanyTerminal protection shield
US4420210 *Sep 17, 1981Dec 13, 1983The Bendix CorporationHermetic through bulkhead electrical connector
US4445744 *Jul 19, 1982May 1, 1984Itt CorporationHigh pressure electrical connector
US4826451 *Dec 11, 1987May 2, 1989General Electric CompanyMore durable modified connector for nuclear power plant pressurizer heater applications
US4966559 *Oct 12, 1989Oct 30, 1990Tecumseh Products CompanyInternal terminal block for compressor hermetic terminal
US4984973 *Mar 21, 1990Jan 15, 1991Tecumseh Products CompanyHermetic motor compressor unit having a hermetic terminal with electrically insulating anti-tracking cap
US5129843 *Jun 19, 1991Jul 14, 1992Emerson Electric Co.Connector block for a terminal assembly
US5391061 *Mar 12, 1993Feb 21, 1995Matsushita Refrigeration CompanyHermetic terminal cover and compressor incorporating same
US5580282 *Jan 14, 1994Dec 3, 1996Emerson Electric Co.Sealable shaped connector block for a terminal assembly
US5664959 *Dec 23, 1996Sep 9, 1997Carrier CorporationElectrical connector plug
US6107566 *Nov 7, 1998Aug 22, 2000Emerson Electric Co.Hermetic terminal structure
US6273754Apr 13, 2000Aug 14, 2001Tecumseh Products CompanyProtective covering for the terminal assembly of a hermetic compressor assembly
US6305989Aug 30, 1999Oct 23, 2001Emerson Electric Co.Connector block for a terminal assembly
US6362424May 31, 2000Mar 26, 2002Emerson Electric Co.Hermetic terminal retainer structure
US6441311 *Dec 21, 2000Aug 27, 2002Matsushita Electric Industrial Co., Ltd.Power supply terminal for use with a motor-driven compressor and method of insulating same
US6509525Feb 11, 2002Jan 21, 2003Emerson Electric Co.Hermetic terminal assembly
US6699078Dec 21, 2001Mar 2, 2004Emerson Electric Co.Connector block having at least one protrusion, for a terminal assembly
US6764228 *Feb 7, 2002Jul 20, 2004Veritech, Inc.Sealing of an optical passage, such as a window or optical fiber, within a hermetic package in a manner to limit materials given off by sealants such as organic adhesives from access to the interior of the hermetic package
US6899545 *Aug 10, 2004May 31, 2005Special Hermetic Products, Inc.Coupling and method for producing a hermetic seal
US6910904May 4, 2001Jun 28, 2005Tecumseh Products CompanyCompressor with terminal assembly having dielectric material
US6921297Aug 4, 2003Jul 26, 2005Emerson Electric Co.Hermetic terminal assembly and associated method of manufacture
US7025614Jan 6, 2005Apr 11, 2006Tecumseh Products CompanyCompressor with terminal assembly having dielectric material
US7344400 *Sep 20, 2005Mar 18, 2008Sanden CorporationTerminal connection structure of motor incorporated within a compressor
US7445481 *Nov 20, 2006Nov 4, 2008Sumitomo Wiring Systems, Ltd.Connector
US7663055 *Jan 19, 2004Feb 16, 2010Apollon SolarPhotovoltaic module comprising external connector pins
US8378212Jun 4, 2009Feb 19, 2013Raytheon CompanySealed electrical feed-through assembly and methods of making same
CN1983734BNov 24, 2006May 26, 2010住友电装株式会社A connector and a molding method therefor
CN101673899BSep 30, 2009Feb 29, 2012中航光电科技股份有限公司High pressure resistance sealed connector and adaptor thereof
EP0572398A1 *Jun 5, 1991Dec 8, 1993Standex International CorporationArc suppressing cluster assembly
Classifications
U.S. Classification439/695, 439/935, 439/736, 174/152.0GM
International ClassificationH01J5/26, H01R9/16, H01B17/30, H01R13/53, H01R24/14
Cooperative ClassificationY10S439/935, H01R13/53, H01J5/26, H01J2893/0043, H01R2201/10, H01B17/305
European ClassificationH01J5/26, H01R13/53, H01B17/30B1
Legal Events
DateCodeEventDescription
Nov 14, 1997ASAssignment
Owner name: AMERICAN STANDARD, INC., NEW JERSEY
Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:008869/0001
Effective date: 19970801
Nov 13, 1997ASAssignment
Owner name: AMERICAN STANDARD, INC., NEW JERSEY
Free format text: RELEASE OF SECURITY INTEREST (RE-RECORD TO CORRECT DUPLICATES SUBMITTED BY CUSTOMER. THE NEW SCHEDULE CHANGES THE TOTAL NUMBER OF PROPERTY NUMBERS INVOLVED FROM 1133 TO 794. THIS RELEASE OF SECURITY INTEREST WAS PREVIOUSLY RECORDED AT REEL 8869, FRAME 0001.);ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:009123/0300
Effective date: 19970801
Jun 2, 1993ASAssignment
Owner name: CHEMICAL BANK, AS COLLATERAL AGENT, NEW YORK
Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:BANKERS TRUST COMPANY, AS COLLATERAL TRUSTEE;REEL/FRAME:006565/0753
Effective date: 19930601
Jun 28, 1988ASAssignment
Owner name: BANKERS TRUST COMPANY
Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN STANDARD INC., A DE. CORP.,;REEL/FRAME:004905/0035
Owner name: BANKERS TRUST COMPANY, 4 ALBANY STREET, 9TH FLOOR,
Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213
Effective date: 19880624
Owner name: BANKERS TRUST COMPANY, NEW YORK
Jul 5, 1985ASAssignment
Owner name: TRANE COMPANY THE A DE CORP.
Free format text: MERGER;ASSIGNOR:TRANE CAC, INC., A CORP OF DE;REEL/FRAME:004432/0755
Effective date: 19831222
Jul 5, 1985AS03Merger
Owner name: TRANE CAC, INC., A CORP OF DE
Owner name: TRANE COMPANY THE A DE CORP.
Effective date: 19831222
Feb 14, 1985ASAssignment
Owner name: AMERICAN STANDARD INC., A CORP OF DE
Free format text: MERGER;ASSIGNORS:TRANE COMPANY, THE;A-S SALEM INC., A CORP. OF DE (MERGED INTO);REEL/FRAME:004372/0349
Effective date: 19841226
Owner name: TRANE COMPANY THE
Free format text: MERGER;ASSIGNORS:TRANE COMPANY THE, A CORP OF WI (INTO);A-S CAPITAL INC., A CORP OF DE (CHANGED TO);REEL/FRAME:004372/0370
Effective date: 19840224
Aug 13, 1984ASAssignment
Owner name: TRANE COMPANY, THE
Free format text: MERGER;ASSIGNOR:A-S CAPITAL INC. A CORP OF DE;REEL/FRAME:004334/0523
Owner name: TRANE COMPANY, THE, A WI CORP
Free format text: MERGER;ASSIGNOR:TRANE CAC, INC.;REEL/FRAME:004317/0720
Effective date: 19831222
Sep 23, 1982ASAssignment
Owner name: TRANE CAC, INC., LA CROSSE, WI, A CORP. OF DE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL ELECTRIC COMPANY A NY CORP.;REEL/FRAME:004053/0022
Effective date: 19820915