CA1111479A - Elastomeric submersible motor seals - Google Patents
Elastomeric submersible motor sealsInfo
- Publication number
- CA1111479A CA1111479A CA283,736A CA283736A CA1111479A CA 1111479 A CA1111479 A CA 1111479A CA 283736 A CA283736 A CA 283736A CA 1111479 A CA1111479 A CA 1111479A
- Authority
- CA
- Canada
- Prior art keywords
- cavity
- cord
- housing
- jacketed
- diameter
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- 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
- H01B17/26—Lead-in insulators; Lead-through insulators
- H01B17/30—Sealing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Gasket Seals (AREA)
- Motor Or Generator Frames (AREA)
Abstract
SUBMERSIBLE MOTOR SEALS
Abstract of the Disclosure A submersible motor comprising a first housing including a motor and a second housing enclosing electrical connections between the motor and a jacketed electrical cord to the second housing. The second housing has a cavity therein which faces inwardly or outwardly. An electrical cord comprising a plurality of wires covered by a jacket extends from the connections within the second housing to the exterior of the second housing. A body of compressible resilient elastomeric material is compressed in the cavity in the second housing.
The body in the unstressed state has a configuration and dimensions greater than the cavity. The body has an axial passage therein having a diameter greater than the diameter of the jacketed cord, when the body is in untensioned state. The body is compressed in the cavity with the cord in position within the body such that the body compresses and seals along the periphery of the cavity and the periphery of the cord.
-i-
Abstract of the Disclosure A submersible motor comprising a first housing including a motor and a second housing enclosing electrical connections between the motor and a jacketed electrical cord to the second housing. The second housing has a cavity therein which faces inwardly or outwardly. An electrical cord comprising a plurality of wires covered by a jacket extends from the connections within the second housing to the exterior of the second housing. A body of compressible resilient elastomeric material is compressed in the cavity in the second housing.
The body in the unstressed state has a configuration and dimensions greater than the cavity. The body has an axial passage therein having a diameter greater than the diameter of the jacketed cord, when the body is in untensioned state. The body is compressed in the cavity with the cord in position within the body such that the body compresses and seals along the periphery of the cavity and the periphery of the cord.
-i-
Description
This invention relates to submersible motors - and particularly to seals for submersible motors.
Background and Summary of the Invention In submersible electrical devices such as motors, it is required that the electrical leads be insulated or sealed from the surrounding water. It has ` been the practice in the past to use various methods of bringing out a jacketed electrical lead from inside a cavity required to be sealed from water or other liquids and for connection to an outside electrical power source.
,; Such a sealing requirement is common where it is required ~ , ~; to immerse in water an electrical appliance or device ...
~ such as a submersible sump pump so that it is necessary . :
to seal the lead at the point where it emerges from the pump internal connection or switch cavity. Any such method of sealing has also been required to meet a strain relief pull specification as prescribed by ~ agencies like the Underwriter Laboratories and ,~ Canadian Standard Association.
Past efforts to meet the sealing and strain pull requirements have largely centered around three basic approaches all workable but possessing disadvantages one of which being excessive costs. These current methods include ~1) the use of the well known threaded compression screw to effect a seal to the outer diameter of ., , .', - 1 -,' ' `
:
the lead which is emerging from a threaded hole in the cavity, (2) the screwing down of a metal plate to compress a follower washer against a rubber ring seal which in turn compresses against the outer diameter of . ~ ~
the lead and (3) the potting of an epoxy resin around the lead and bonding to the internal diameter of the `:`
hole in the cavity.
The costs involved in using threaded components - 10 is obvious and is amplified by the assembly of multiple -~ parts. Another disadvantage is the excess of radially ~ inward force due to the high mechanical advantage of the -~ threads which sometimes create a thinning down of the lead insulation to the point where it becomes susceptable to mechanical abuse. Potting processes are at best inconvenient and often messy creat~ng bottlenecks in high production assembly due to the need for application of heat and/or long cure times.
The present invention is intended to eliminate the aforementioned disadvantages by using unique and simple means for effecting a suitable strain relief and seal at the location where it is required to have a jacketed lead or cord emerge from a cavity wherein electrical connections are made.
. , :
Background and Summary of the Invention In submersible electrical devices such as motors, it is required that the electrical leads be insulated or sealed from the surrounding water. It has ` been the practice in the past to use various methods of bringing out a jacketed electrical lead from inside a cavity required to be sealed from water or other liquids and for connection to an outside electrical power source.
,; Such a sealing requirement is common where it is required ~ , ~; to immerse in water an electrical appliance or device ...
~ such as a submersible sump pump so that it is necessary . :
to seal the lead at the point where it emerges from the pump internal connection or switch cavity. Any such method of sealing has also been required to meet a strain relief pull specification as prescribed by ~ agencies like the Underwriter Laboratories and ,~ Canadian Standard Association.
Past efforts to meet the sealing and strain pull requirements have largely centered around three basic approaches all workable but possessing disadvantages one of which being excessive costs. These current methods include ~1) the use of the well known threaded compression screw to effect a seal to the outer diameter of ., , .', - 1 -,' ' `
:
the lead which is emerging from a threaded hole in the cavity, (2) the screwing down of a metal plate to compress a follower washer against a rubber ring seal which in turn compresses against the outer diameter of . ~ ~
the lead and (3) the potting of an epoxy resin around the lead and bonding to the internal diameter of the `:`
hole in the cavity.
The costs involved in using threaded components - 10 is obvious and is amplified by the assembly of multiple -~ parts. Another disadvantage is the excess of radially ~ inward force due to the high mechanical advantage of the -~ threads which sometimes create a thinning down of the lead insulation to the point where it becomes susceptable to mechanical abuse. Potting processes are at best inconvenient and often messy creat~ng bottlenecks in high production assembly due to the need for application of heat and/or long cure times.
The present invention is intended to eliminate the aforementioned disadvantages by using unique and simple means for effecting a suitable strain relief and seal at the location where it is required to have a jacketed lead or cord emerge from a cavity wherein electrical connections are made.
. , :
- 2 -Description of the Drawinqs Fig. 1 is a part sectional elevational view of a submersible pump motor embodying the invention.
... .
Fig. 2 is a fragmentary sectional view on an enlarged scale of a portion of the submersible pump motor in Fig. 1.
` Fig. 3 is a perspective view of a part of a sealing arrangement according to the invention.
., .
Fig. 4 is a perspective view of another sealing arrangement according to the invention.
Fig. 5 is a sectional view showing the method of assembly of the parts of the motor shown in Fig. 2.
Fig. 6 is a sectional view of a modified sealing arrangement in accordance with the invention.
- 15 Fig. 7 is a sectional view of a further modified ~ sealing arrangement in accordance with the invention.
; Description Referring to Fig. 1, the invention relates to submersible motors such as shown in Fig. 1 which includes a housing comprising a first part 10 for a motor that has an output shaft 11 that may operate a pump impeller - or the like. A second part 12 of the housing is ;~ removably mounted on housing 10 by screws 13a (one - of which is shown). Part 12 has a cavity in which electrical connections are made between the leads from the motor housing 10 and a jacketed outlet cord 13 :
:~, ' L~L , , - 3 -:
:
that includes wires 13b extending to a power source and a breather tube 13c. In addition, the cavity of second housing may include a pressure switch S to which connections are made from the motor winding and cord 13. The motor is adapted `to be mounted with the shaft 11 at any angle.
The parts 10, 12 of housing 10 are preferably made of water and heat resistant, dimensionally stable material such as powdered iron or a glass reinforced styrene modified polyphenylene oxide sold under the trademark NORYL. It is necessary to provide a seal between the cord 13 that contains wires 13b and breather tube 13c and housing part 12 to the exterior of the housing.
Referring to Fig. 2, the seal is provided - between the cord 13 and the housing part 12 by a rubber body or seal 15 that is compressed in an open ended cavity 16 which has its open end extending inwardly of the housing 12. The closed end of cavity 16 is formed by a base 30 having an opening 31 through which cord 13 extends. Body 15 engages base 30. The body 15 is preferably made of acrylonitrile-butadiene rubber sold under the trademark BUNA N and having a shore durometer of 35 to 60 on the A scale so that it -falls within the qualifications of soft rubber.
., ' - .
~ - 4 -7~9 ....
. ~ . .
Satisfactory results have been achieved with a rubber having a durometer of 50.
As shown in Figs. 3-5, body 15 is first slipped over cord 13 and then compressed for assembly by placing ;~ 5 the cavity 16 adjacent a fixture 17 having a tapered ;~ opening 18 and a tubular ram 19 of lesser diameter than the tapered opening 18 in fixture 17. Since the wall of the opening 18 tapers from a diameter larger than the rubber body 15 to a diameter slightly smaller than the cavity 16 when force is applied to ram 19 the rubber seal 15 is progressively compressed and therefore easily stuffed into the cavity 16. The opening 20 in ram 19 is large enough to provide an outlet for the lead 13. If desired, a lubricant may be used on the outside of the ; 15 body 15 to reduce the insertion force required.
The rubber seal dimensions and material hard-ness are selected for a given jacketed lead size to provide a high integrity sealed entry of the lead to the cavity and ! due to the gripping action of the seal on the lead, a pull resistance on the lead from the outside of up to 35 pounds is attainable.
If greater resistance to pull is desired, a simple wire hog ring 21 can be crimped to the lead and against the seal as a final operation of the assembly.
As pull is exerted on the lead, the hog ring pulls into '-'', ' ', .~
the seal creating a greater compression force on the outer diameter of the lead and engages the seal axially to prevent movement of the lead axially through the seal.
Where the motor does not require a chamber to contain the pressure switch or the like, the second housing part 12 can be simplified as shown in Fig. 6.
In this form, the second housing part 12' of the motor is removably mounted on housing part 10 and has a cavity 26 with both ends open. The connections of cord 13' to the wires 14 extending to the motor can be made prior to insertion of the resilient compressible body 15 in which case the housing 12' is first mounted on housing part 10. Alternatively, the connections can be made after insertion of body 15', in which case the housing 12' is mounted on housing 10 after the ~; connections are made. In either case the body 15' is inserted from the exterior of housing part 12' by an . .
apparatus like that shown in Fig. 5. The resistance to outward pull of the body 15' from cavity 26 is achieved solely by the friction between body 15' and the wall of opening 26. However a significant resistance to pull can be achieved by use of a hog ring 27 clamped about the cord 13' on the interior of housing so that it becomes embedded in body 15' when .
:
~ a force is applied to cord 13', as in the previous . . .
form of the invention. Further resistance to pull can be achieved by staking all or portions of the end sur-face as at 29.
:. 5 Where the motor housing is made in a single part as shown in Fig. 7, housing 10' has a cavity 26' for receiving the compressible body 15', as in the form ~,: in Fig. 6.
, . . .
~' :
... ~
'''` ' .
:, :',' .. ..
~ . .
,~,, . .
, ~.'' - ' :
. .
'
... .
Fig. 2 is a fragmentary sectional view on an enlarged scale of a portion of the submersible pump motor in Fig. 1.
` Fig. 3 is a perspective view of a part of a sealing arrangement according to the invention.
., .
Fig. 4 is a perspective view of another sealing arrangement according to the invention.
Fig. 5 is a sectional view showing the method of assembly of the parts of the motor shown in Fig. 2.
Fig. 6 is a sectional view of a modified sealing arrangement in accordance with the invention.
- 15 Fig. 7 is a sectional view of a further modified ~ sealing arrangement in accordance with the invention.
; Description Referring to Fig. 1, the invention relates to submersible motors such as shown in Fig. 1 which includes a housing comprising a first part 10 for a motor that has an output shaft 11 that may operate a pump impeller - or the like. A second part 12 of the housing is ;~ removably mounted on housing 10 by screws 13a (one - of which is shown). Part 12 has a cavity in which electrical connections are made between the leads from the motor housing 10 and a jacketed outlet cord 13 :
:~, ' L~L , , - 3 -:
:
that includes wires 13b extending to a power source and a breather tube 13c. In addition, the cavity of second housing may include a pressure switch S to which connections are made from the motor winding and cord 13. The motor is adapted `to be mounted with the shaft 11 at any angle.
The parts 10, 12 of housing 10 are preferably made of water and heat resistant, dimensionally stable material such as powdered iron or a glass reinforced styrene modified polyphenylene oxide sold under the trademark NORYL. It is necessary to provide a seal between the cord 13 that contains wires 13b and breather tube 13c and housing part 12 to the exterior of the housing.
Referring to Fig. 2, the seal is provided - between the cord 13 and the housing part 12 by a rubber body or seal 15 that is compressed in an open ended cavity 16 which has its open end extending inwardly of the housing 12. The closed end of cavity 16 is formed by a base 30 having an opening 31 through which cord 13 extends. Body 15 engages base 30. The body 15 is preferably made of acrylonitrile-butadiene rubber sold under the trademark BUNA N and having a shore durometer of 35 to 60 on the A scale so that it -falls within the qualifications of soft rubber.
., ' - .
~ - 4 -7~9 ....
. ~ . .
Satisfactory results have been achieved with a rubber having a durometer of 50.
As shown in Figs. 3-5, body 15 is first slipped over cord 13 and then compressed for assembly by placing ;~ 5 the cavity 16 adjacent a fixture 17 having a tapered ;~ opening 18 and a tubular ram 19 of lesser diameter than the tapered opening 18 in fixture 17. Since the wall of the opening 18 tapers from a diameter larger than the rubber body 15 to a diameter slightly smaller than the cavity 16 when force is applied to ram 19 the rubber seal 15 is progressively compressed and therefore easily stuffed into the cavity 16. The opening 20 in ram 19 is large enough to provide an outlet for the lead 13. If desired, a lubricant may be used on the outside of the ; 15 body 15 to reduce the insertion force required.
The rubber seal dimensions and material hard-ness are selected for a given jacketed lead size to provide a high integrity sealed entry of the lead to the cavity and ! due to the gripping action of the seal on the lead, a pull resistance on the lead from the outside of up to 35 pounds is attainable.
If greater resistance to pull is desired, a simple wire hog ring 21 can be crimped to the lead and against the seal as a final operation of the assembly.
As pull is exerted on the lead, the hog ring pulls into '-'', ' ', .~
the seal creating a greater compression force on the outer diameter of the lead and engages the seal axially to prevent movement of the lead axially through the seal.
Where the motor does not require a chamber to contain the pressure switch or the like, the second housing part 12 can be simplified as shown in Fig. 6.
In this form, the second housing part 12' of the motor is removably mounted on housing part 10 and has a cavity 26 with both ends open. The connections of cord 13' to the wires 14 extending to the motor can be made prior to insertion of the resilient compressible body 15 in which case the housing 12' is first mounted on housing part 10. Alternatively, the connections can be made after insertion of body 15', in which case the housing 12' is mounted on housing 10 after the ~; connections are made. In either case the body 15' is inserted from the exterior of housing part 12' by an . .
apparatus like that shown in Fig. 5. The resistance to outward pull of the body 15' from cavity 26 is achieved solely by the friction between body 15' and the wall of opening 26. However a significant resistance to pull can be achieved by use of a hog ring 27 clamped about the cord 13' on the interior of housing so that it becomes embedded in body 15' when .
:
~ a force is applied to cord 13', as in the previous . . .
form of the invention. Further resistance to pull can be achieved by staking all or portions of the end sur-face as at 29.
:. 5 Where the motor housing is made in a single part as shown in Fig. 7, housing 10' has a cavity 26' for receiving the compressible body 15', as in the form ~,: in Fig. 6.
, . . .
~' :
... ~
'''` ' .
:, :',' .. ..
~ . .
,~,, . .
, ~.'' - ' :
. .
'
Claims (6)
FOLLOWS:
1. In a submersible motor or the like, a combined seal and strain relief construction comprising a housing including a first part defining a chamber containing a motor, said housing including a second part having an open-ended cylindrical cavity therein, a jacketed electrical cord extending from said second housing part to the exterior of said housing, said electrical cord comprising a plurality of wires and a jacket surrounding said wires, a body of compressible elastomeric material, said body in the uncompressed state having a configuration and dimensions greater than said cavity, said body having an axial passage therethrough through which said cord extends, the diameter of said axial passage being greater than the diameter of said jacketed cord when said body is in an uncompressed state, said body being compressed radially between a wall defining said cavity and said jacketed cord such that the body compresses and seals around the periphery of the cavity and the periphery of the jacketed cord, the diameter of said body being such that said body can only be inserted in said cavity only by compressing said body radially prior to insertion in said cavity, said body being unrestrained axially in the dir-ection of said open end of said cavity and being retained in said cavity solely by the compression of said body between the wall of said cavity and said jacketed cord and said jacketed cord being retained axially within said body solely by the compression of said body between the wall of said cavity and said jacketed cord.
2. The construction set forth in Claim 1 including a hog ring crimped about said jacketed cord within said cavity externally of said body on the inside of said second housing part and engaging said body to further resist movement of said cord axially with respect to said body out-wardly with respect to said body due to a pull on said jack-eted cord from outside of said second housing part.
3. The construction set forth in Claim 1 wherein said cavity extends inwardly and has a base adjacent the exterior of said second housing part preventing movement of said body axially outwardly with respect to said second housing part due to a pull on said jacketed cord from outside of said second housing part, said base having an opening through which said jacketed cord extends.
4. The construction set forth in Claim 3 including a hog ring crimped about said jacketed cord within said cavity externally of said body on the inside of said second housing part and engaging said body to further resist movement of said cord axially with respect to said second housing part due to a pull on said cord from outside of said second housing part.
5. The construction set forth in Claim 1 wherein said open end of said cavity extends axially outwardly.
6. The method of providing a seal and strain relief between a cylindrical cavity in a part of a housing and a jacketed electric cord comprising a plurality of wires and a jacket surrounding said wires which comprises inserting said cord through an axial passage through a substantially cylindrical body of elastomeric material, which passage has a diameter greater than the diameter of said cord when said body is in the uncompressed state, said body having a diameter in the uncompressed state greater than the diameter of said cavity in said housing, compressing said body radially to a diameter less than the diameter of said cavity, thereafter inserting said compressed body and cord in said cavity, releasing the compressed body such that said body remains compressed within said cavity to provide a seal and strain relief around the periphery of said cavity and the periphery of said cord.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74706676A | 1976-12-03 | 1976-12-03 | |
| US747,066 | 1991-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1111479A true CA1111479A (en) | 1981-10-27 |
Family
ID=25003528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA283,736A Expired CA1111479A (en) | 1976-12-03 | 1977-07-29 | Elastomeric submersible motor seals |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE858130A (en) |
| CA (1) | CA1111479A (en) |
| DE (1) | DE2748419A1 (en) |
| GB (1) | GB1590536A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4018905A1 (en) * | 1990-06-13 | 1991-12-19 | Kaercher Gmbh & Co Alfred | CABLE RELEASE |
| DE4024974A1 (en) * | 1990-08-07 | 1992-02-13 | Teves Gmbh Alfred | DEVICE FOR GUIDING AND FASTENING ONE OR MORE ELECTRICAL LINES |
| GB9307698D0 (en) * | 1993-04-14 | 1993-06-02 | Foss Victoria A | Cable sealing and locking device |
| GB2298527B (en) * | 1995-03-01 | 1998-12-16 | Bowthorpe Plc | Cable sealing and locking device |
| DE102021130130A1 (en) | 2021-11-18 | 2023-05-25 | Schaeffler Technologies AG & Co. KG | Method for mounting a decoupling element in a through hole of a stator of an electric machine, stator for an electric machine and electric machine comprising such a stator |
-
1977
- 1977-07-29 CA CA283,736A patent/CA1111479A/en not_active Expired
- 1977-08-26 BE BE180443A patent/BE858130A/en unknown
- 1977-09-14 GB GB3830277A patent/GB1590536A/en not_active Expired
- 1977-10-28 DE DE19772748419 patent/DE2748419A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| BE858130A (en) | 1977-12-16 |
| GB1590536A (en) | 1981-06-03 |
| DE2748419A1 (en) | 1978-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |