US4838763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Canned motor pump
Assignee: HERMETIC-PUMPEN A Co OF FEDERAL REPUBLIC GERMANY GmbH
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Filing: 1987-11-20
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Granted: 1989-06-13
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Expires: 2007-11-20
Abstract
Abstract A canned motor pump wherein the can has at least two coaxial tubular walls defining an annular space for the flow of a preferably gaseous fluid which is used to facilitate detection of leaks in the walls of the can. Each tubular wall can individually seal the driving unit from the driven unit of the pump motor. The leak detector can generate visible, audible and/or otherwise detectable signals, and such signals can also serve to stop the motor in the event of leakage.
Inventors
- 👤 Roland Kramer
- 👤 Robert Neumaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:59
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/106; F; F04; F04D; F04D13/00; F04D13/02; F04D13/021; F04D13/024; F04D13/025; F04D13/06; F04D13/0606; F04D13/0626; F04D15/00; F04D15/0077; F04D15/02; F04D15/0245; F04D15/0263; H02K5/00; H02K5/04; H02K5/12; H02K5/128; H02K11/00
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
72 words
A canned motor pump, comprising a hollow driving unit; a rotary driven unit which is at least partially surrounded by said driving unit; means for sealing fluids about said units from each other, comprising a can interposed between said units and including a plurality of walls which define a space; and means for monitoring said space for fluid leaks, said monitoring means including external sensing means responsive to leakage through said walls.
Claim 2
Dependent Claim
72 words
A canned motor pump, comprising a hollow driving unit; a rotary driven unit which is at least partially surrounded by said driving unit; means for sealing fluids about said units from each other, comprising a can interposed between said units and including a plurality of walls which define a space; and means for monitoring said space for fluid leaks, said monitoring means including external sensing means responsive to leakage through said walls.
Claim 3
Dependent Claim
53 words
The pump of claim 1, wherein said driven unit is rotatable about a predetermined axis and said walls include at least two tubular walls having a common axis coinciding with or close to said predetermined axis, one of said tubular walls being at least partially surrounded by the other of said tubular walls.
Claim 4
Dependent Claim
15 words
The pump of claim 1, wherein said monitoring means includes a portion in said space.
Claim 5
Dependent Claim
43 words
The pump of claim 3, wherein said portion of said monitoring means includes a supply of a fluid in said space and said sensing means comprises a device for monitoring at least one variable characteristic, particularly the pressure, of flud in said space.
Claim 6
Dependent Claim
31 words
The pump of claim 3, wherein said portion of said monitoring means includes means for generating signals in response to detection of a leak in at least one of said walls.
Claim 7
Dependent Claim
53 words
The pump of claim 1, wherein said walls include substantially concentric first and second tubular walls defining an annular space having a width in the radial direction of said tubular walls such as to allow for circulation of a gaseous fluid therein but to at least greatly obstruct the circulation of a liquid.
Claim 8
Dependent Claim
12 words
The pump of claim 6, wherein said tubular walls have abutting portions.
Claim 9
Dependent Claim
32 words
The pump of claim 1, wherein said walls include at least two substantially concentric tubular walls defining an annular space, said monitoring means including a supply of gaseous fluid in said space.
Claim 10
Dependent Claim
29 words
The pump of claim 8, wherein said monitoring means comprises means for maintaining the fluid in said space at a presure which deviates from the pressure around said can.
Claim 11
Dependent Claim
22 words
The pump of claim 8, wherein the pressure of fluid in said space at least slightly exceeds the pressure around said can.
Claim 12
Dependent Claim
63 words
The pump of claim 1, wherein said walls include at least two substantially concentric tubular walls defining at least one annular space, said monitoring means including means for maintaining in said at least one space a supply of fluid including means for admitting the fluid into said at least one space, and said sensing means including a pressure gauge in said admitting means.
Claim 13
Dependent Claim
35 words
The pump of claim 11, further comprising a housing fir said driving unit including a support for said admitting means, said support defining an inlet for admission of fluid into said at least one space.
Claim 14
Dependent Claim
43 words
The pump of claim 12, wherein said tubular walls have end portions in the region of said inlet and said inlet communicates with an end of said at least one annular space in the region of the end portions of said tubular walls.
Claim 15
Dependent Claim
37 words
The pump of claim 1, wherein said can has a first end and a second end and said walls include at least two substantially concentric tubular walls and an end wall at one end of said can.
Claim 16
Dependent Claim
19 words
The pump of claim 14, wherein at least a portion of said end wall includes a plurality of panels.
Claim 17
Dependent Claim
30 words
The pump of claim 15, wherein said tubular walls define a first space and said panels of said end wall define a second space which communicates with said first space.
Claim 18
Dependent Claim
24 words
The pump of claim 16, wherein said can defines a path for the flow of a gaseous fluid between said first and second spaces.
Claim 19
Dependent Claim
24 words
The pump of claim 14, further comprising means for sealingly and mechanically connecting at least one of said tubular walls to said end wall.
Claim 20
Dependent Claim
15 words
The pump of claim 18, wherein said connecting means comprises at least one welded seam.
Claim 21
Dependent Claim
46 words
The pump of claim 18, wherein said end wall includes first and second panels and said connecting means includes means for connecting one of said tubular walls with one of said panels and means for connecting another of said tubular walls with another of said panels.
Claim 22
Dependent Claim
34 words
The pump of claim 1, said monitoring means including a supply of a gaseous fluid in said at least one space and said sensing means comprising means for monitoring the pressure of said fluid.
Claim 23
Dependent Claim
34 words
The pump of claim 1, wherein said monitoring means includes a detector installed in said at least one space and arranged to transmit signals denoting the condition of at least one of said walls.
Claim 24
Dependent Claim
21 words
The pump of claim 22, wherein said sensing means comprises an alarm device which is responsive to signals from said detector.
Claim 25
Dependent Claim
22 words
The pump of claim 22, wherein said sensing means comprises means for arresting the pump in response to signals from said detector.
Claim 26
Dependent Claim
21 words
The pump of claim 22, wherein said detector includes an at least partially conductive foil in said at least one space.
Claim 27
Dependent Claim
17 words
The pump of claim 25, wherein said foil consists at least in part of a heat-conducting material.
Claim 28
Dependent Claim
17 words
The pump of claim 25, wherein said foil consists at least in part of a pressure-resistant material.
Claim 29
Dependent Claim
34 words
The pump of claim 1, wherein said walls include two at least substantially concentric tubular walls having confronting surfaces, at least one of said surfaces having protuberances extending toward the other of said surfaces.
Claim 30
Dependent Claim
42 words
The pump of claim 1, wherein said walls include at least substantially concentric tubular inner and outer walls, at least one of said tubular walls having a thickness which is a function of the pressure in the pump adjacent said one wall.
Claim 31
Dependent Claim
14 words
The pump of claim 29, wherein said one tubular wall is said outer wall.
Claim 32
Dependent Claim
22 words
The pump of claim 30, wherein the thickness of said inner tubular wall is less than that of said outer tubular wall.
Claim 33
Dependent Claim
35 words
The pump of claim 29, wherein the other of said tubular walls is elastically deformable into contact with said one wall in the event of a leak in at least one of said tubular walls.
Claim 34
Dependent Claim
40 words
The pump of claim 1, further comprising at least one pumping element receiving torque from said driven unit to thereby convey a fluid medium along a predetermined path, said space being arranged to receive a supply of such fluid medium.
Claim 35
Dependent Claim
58 words
The pump of claim 1, wherein said walls include at least substantially concentric inner and outer tubular walls; and further comprising a housing for said units and said can and means for separably mounting at least one of said tubular walls in said housing so that the one tubular wall is removable from and reinsertable into said housing.
Claim 36
Dependent Claim
25 words
The pump of claim 34, wherein said can further comprises an end wall having a panel affixed to and movable with said one tubular wall.
Claim 37
Dependent Claim
61 words
The pump of claim 34, further comprising at least one pumping element receiving torque from said driven unit, said can having a first end nearer to and a second end more distant from said at least one pumping element, said means for separably mounting comprising an external flange provided on said one tubular wall adjacent said first end of said can.
Claim 38
Dependent Claim
63 words
The pump of claim 34, further comprising at least one pumping element receiving torque from said driven unit, said can having a first end nearer to and a second end more distant from said at least one pumping element, said means for separably mounting comprising a support affixed to said one tubular wall in the region of the second end of said can.
Claim 39
Dependent Claim
123 words
The pump of claim 1, wherein said walls include at least partially concentric first and second tubular walls; and further comprising a housing for said units and said can and at least one pumping element receiving torque from said driven unit and installed in said housing, said can having a first end nearer to and a second end more distant from said at least one pumping element, and said pump also comprising means for mounting said can in said housing including a flange-like support adjacent one end of said can and having first and second portions respectively surrounding the corresponding ends of said first and second tubular walls, and sealing elements interposed between each portion of said support and the respective tubular wall.
Claim 40
Dependent Claim
25 words
The pump of claim 38, wherein said tubular walls define an annular space and said support has means for admitting a fluid into said space.
Claim 41
Dependent Claim
31 words
The pump of claim 38, wherein said housing comprises an end wall adjacent said support and said end wall has means for centering said support with reference to said driven unit.
Claim 42
Dependent Claim
39 words
The pump of claim 38, wherein said housing includes a closure adjacent said support; and further comprising a bearing for said driven unit and a seat integral with said closure and centering said bearing with reference to said units.
Claim 43
Dependent Claim
19 words
The pump of claim 41, wherein said closure includes means for centering at least one of said tubular walls.
Claim 44
Dependent Claim
19 words
The pump of claim 41, wherein said support includes means for centering said closure with reference to said units.
Claim 45
Dependent Claim
12 words
The pump of claim 1, wherein each of said walls is fixed.
Claim 46
Dependent Claim
27 words
The pump of claim 1, wherein said units comprise magnet means arranged so that said driving unit is capable of inducing rotation of said driven unit magnetically.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |