Patent EP0102824A2 successfully refreshed from Google Patents.
EP0102824A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Low power electromagnetic pump
Assignee: Greatbatch Enterprises Inc
•
Filing: 1983-08-31
•
Granted: —
•
Expires: 2003-08-31
Abstract
Abstract An electromagnetic pump comprising a housing (12) having fluid receiving (14) and pumping (16) chambers therein and in communication with an inlet (18) and an outlet (20), respectively, an electromagnet (70) carried by the housing located external to the fluid chambers thereof, and a barrier in the form of a thin diaphragm (80) of fluid impermeable material which hermetically isolates the electromagnet from the fluid chamber. An armature (110) in the housing is movable within a body (90) of magnetically permeable material and has a pole portion (116) located for magnetic attraction by the electromagnet and has a planger (114) portion in the pumping chamber (16) for forcing fluid out of the chamber through the outlet (20). The armature (110) is moved from a rest position through a forward pumping stroke when attracted by the electromagnet to force fluid out of the pumping chamber (16) through the outlet (20), and the armature is moved by biasing spring (130) in an opposite direction through a return stroke back to the rest position. A magnetic circuit is defined including the electro magnet (70), a portion of the fluid-impermeable barrier (80), the body (90), the armature pole portion (116) and a gap defined between the pole portion and the electromagnet which gap is closed during movement of the armature toward the electromagnet during energization thereof. In another aspect the pump includes a pair of serially-connected fluid pumping chambers (316,318) one in communication with a fluid receiving chamber (314) and the other in communication with an outlet (322), and the armature (420) has first (434) and second (424) plunger portions in respective ones of the pumping chambers (316,318) for forcing fluid out of the chambers and through the outlet (322). The volume of the fluid receiving chamber (314) is minimized in the region between the check valve (468) and the neighboring plunger portion (434). Long term sealing against back flow is provided by a relatively stronger spring (450) and short term sealing by a relatively weaker spring (498).
Inventors
- 👤 Theodore J. Falk
- 👤 Lawrence E. Morris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:49
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14244; A61M5/14276; A61M5/14212; A61M5/14216; F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/042; F04B3/00; F04B53/00; F04B53/008
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
242 words
An electromagnetic pump comprising: a) a housing having an interior fluid containing region including a fluid receiving chamber and a fluid pumping chamber in fluid communication therewith, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said pumping chamber; b) check valve means operatively associated with said fluid containing region for allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet; c) electromagnet means carried by said housing and located external to said fluid containing region; d) an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means and having a plunger portion in said pumping chamber for forcing fluid out of said chamber through said outlet; said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid out of said pumping chamber through said outlet and for movement in an opposite direction through a return stroke back to said rest position; and e) means for defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said'armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means.
Claim 2
Dependent Claim
242 words
An electromagnetic pump comprising: a) a housing having an interior fluid containing region including a fluid receiving chamber and a fluid pumping chamber in fluid communication therewith, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said pumping chamber; b) check valve means operatively associated with said fluid containing region for allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet; c) electromagnet means carried by said housing and located external to said fluid containing region; d) an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means and having a plunger portion in said pumping chamber for forcing fluid out of said chamber through said outlet; said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid out of said pumping chamber through said outlet and for movement in an opposite direction through a return stroke back to said rest position; and e) means for defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said'armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means.
Claim 3
Dependent Claim
82 words
A pump according to claim 1, further including a body of magnetically permeable material in said housing fluid containing region between said fluid receiving chamber and said fluid pumping chamber, said body defining a portion of said magnetic circuit, said body having a passage therethrough for receiving said armature pole portion in a movable, close-fitting relation whereby said armature moves in said body during said forward and return strokes and said magnetic circuit is through said body and said armature pole portion.
Claim 4
Dependent Claim
57 words
A pump according to claim 2, wherein the axial length of said passage in said body is relatively large as compared to the length of the space between the inner surface of said passage and the outer surface of said armature pole portion to minimize the effective air gap defined therebetween and introduced in said magnetic circuit.
Claim 5
Dependent Claim
204 words
A pump according to claim 1, wherein said housing is elongated having a longitudinal axis, said armature being positioned for movement along said housing longitudinal axis, said fluid containing region of said housing and said electromagnet being in axially-spaced relation along said housing longitudinal axis, and further including: a) barrier means of fluid-impervious material separating said electromagnet and said fluid-containing region of said housing, said barrier means comprising a thin plate of metal compatible with the fluid, fixed between and providing an hermetic seal between said electromagnet and said fluid containing region of said housing; and b) a body of magnetically permeable material in said housing fluid containing region between said fluid receiving chamber and said fluid pumping chamber, said body having a passage therethrough for receiving said armature pole portion in a movable, close-fitting relation whereby said armature moves in said body during said forward and return strokes, said armature pole portion co-operating with said passage to define a leakage path for fluid from said pumping chamber to said receiving chamber during movement of said armature through said return stroke; c) whereby said magnetic circuit includes said body, said armature pole portion and the portions of said barrier plate associated with said electromagnet.
Claim 6
Dependent Claim
93 words
A pump according to claim 4, wherein pumping chamber is defined between said barrier plate and said body, said armature pole portion moves in said pumping chamber and has a pole face on the end thereof disposed toward said barrier plate, and said gap is defined between said armature Dole face and said barrier plate, whereby as said gap is reduced during energization of said electromagnet causing the forward pumping stroke the movement of said armature pole face toward said barrier plate forces fluid out of said pumping chamber through said housing outlet.
Claim 7
Dependent Claim
81 words
A pump according to claim 4, wherein said electromagnet means includes a housing of magnetically permeable material having an end face contacting one surface of said barrier plate, said body has an end face contacting the other surface of said plate, and the areas of contact of said end faces of said electromagnet housing and said body with said surface of said plate are of sufficient size to minimize the effective air gap introduced by said plate in said magnetic circuit.
Claim 8
Dependent Claim
56 words
A pump according to claim 4, wherein the axial length of said passage in said body is relatively long as compared to the length of the space between the inner surface of said passage and the outer surface of said armature pole portion to minimize the effective air gap defined therebetween introduced in said magnetic circuit.
Claim 9
Dependent Claim
201 words
In an electromagnetic pump including a housing having an interior fluid containing region, an inlet and an outlet in fluid communication with said region, electromagnet means carried by said housing and located external to said fluid containing region of said housing, and an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means causing movement of said armature to force fluid out of said region through said outlet, the improvement comprising: a) barrier means of fluid-impervious material separating said electromagnet and said fluid containing region of said housing; b) a body of magnetically permeable material in said housing fluid containing region and having a passage therethrough for receiving said armature pole portion in a movable, close-fitting relation; and c) means for defining a magnetic circuit including said electromagnet means, said body, the included portions of said barrier means between said electromagnet and said body, said armature pole portion and a gap in said fluid containing region of said housing between said armature pole portion and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means.
Claim 10
Dependent Claim
201 words
In an electromagnetic pump including a housing having an interior fluid containing region, an inlet and an outlet in fluid communication with said region, electromagnet means carried by said housing and located external to said fluid containing region of said housing, and an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means causing movement of said armature to force fluid out of said region through said outlet, the improvement comprising: a) barrier means of fluid-impervious material separating said electromagnet and said fluid containing region of said housing; b) a body of magnetically permeable material in said housing fluid containing region and having a passage therethrough for receiving said armature pole portion in a movable, close-fitting relation; and c) means for defining a magnetic circuit including said electromagnet means, said body, the included portions of said barrier means between said electromagnet and said body, said armature pole portion and a gap in said fluid containing region of said housing between said armature pole portion and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means.
Claim 11
Dependent Claim
111 words
An improved electromagnetic pump according to claim 8 wherein said barrier means comprises a thin metal plate fixed between and providing an hermetic seal between said electromagnet and said fluid containing region of said housing and wherein said electromagnet means includes a housing of magnetically permeable material having an end face contacting one surface of said barrier plate, said body has an end face contacting the other surface of said plate, and the areas of contact of said end faces of said electromagnet housing and said body with said surface of said plate are of sufficient size to minimize the effective air gap introduced by said plate in said magnetic circuit.
Claim 12
Dependent Claim
57 words
A pump according to claim 8, wherein the axial length of said passage in said body is relatively long as compared to the length of the space between the inner surface of said passage and the outer surface of said armature pole portion to minimize the effective air gap defined - therebetween introduced in said magnetic circuit.
Claim 13
Dependent Claim
168 words
In an electromagnetic pump including a housing having an interior fluid containing region, an inlet and an outlet in fluid communication with said region, electromagnet means carried by said housing and located external to said fluid-containing region, and an armature positioned in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid out said fluid containing region through said outlet and and for movement in an opposite direction through a return stroke back to said rest position, the improvement comprising: check valve means operatively coupled to said armature and located in said fluid containing region of said housing for closing said inlet 4 when said armature is in said rest position and for opening said inlet after said armature begins movement associated with said forward pumping stroke, said check valve means allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet.
Claim 14
Dependent Claim
168 words
In an electromagnetic pump including a housing having an interior fluid containing region, an inlet and an outlet in fluid communication with said region, electromagnet means carried by said housing and located external to said fluid-containing region, and an armature positioned in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid out said fluid containing region through said outlet and and for movement in an opposite direction through a return stroke back to said rest position, the improvement comprising: check valve means operatively coupled to said armature and located in said fluid containing region of said housing for closing said inlet 4 when said armature is in said rest position and for opening said inlet after said armature begins movement associated with said forward pumping stroke, said check valve means allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet.
Claim 15
Dependent Claim
73 words
An improved electromagnetic pump according to claim 11, wherein said check valve means comprises a valve member movably carried by said armature, and further including: a) first biasing means for urging said armature toward said rest position; b) second biasing means for urging said valve member toward a position closing said inlet; and c) the force provided by said first biasing means being greater than the force provided by said second biasing means.
Claim 16
Dependent Claim
330 words
An electromagnetic pump comprising: a) a housing having an interior fluid containing region including a fluid receiving chamber, a first fluid pumping chamber in fluid communication therewith, a second fluid pumping chamber in fluid communication with said first pumping chamber, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said receiving chamber and an outlet in fluid communication with said second pumping chamber; b) electromagnet means carried by said housing and located external to said fluid containing region; c) an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means and having a first plunger portion in said first pumping chamber for forcing fluid out of said first chamber into said second chamber and a second plunger portion in said second pumping chamber for forcing fluid out of said second chamber through said outlet; said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid from said pumping chambers through said outlet and for movement in an opposite direction through a return stroke back to said rest position; d) means for defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means; and e) check valve means operatively coupled to said armature and located in said fluid containing chamber of said housing for closing said inlet when said armature is in said rest position and for opening said inlet after said armature begins movement associated with said forward pumping stroke, said check valve means allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet.
Claim 17
Dependent Claim
330 words
An electromagnetic pump comprising: a) a housing having an interior fluid containing region including a fluid receiving chamber, a first fluid pumping chamber in fluid communication therewith, a second fluid pumping chamber in fluid communication with said first pumping chamber, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said receiving chamber and an outlet in fluid communication with said second pumping chamber; b) electromagnet means carried by said housing and located external to said fluid containing region; c) an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means and having a first plunger portion in said first pumping chamber for forcing fluid out of said first chamber into said second chamber and a second plunger portion in said second pumping chamber for forcing fluid out of said second chamber through said outlet; said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid from said pumping chambers through said outlet and for movement in an opposite direction through a return stroke back to said rest position; d) means for defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means; and e) check valve means operatively coupled to said armature and located in said fluid containing chamber of said housing for closing said inlet when said armature is in said rest position and for opening said inlet after said armature begins movement associated with said forward pumping stroke, said check valve means allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet.
Claim 18
Dependent Claim
77 words
A pump according to claim 13, wherein said check valve means is in relatively close-fitting relation to the portion of said housing defining said fluid receiving chamber, said check valve means is closely coupled to and located closely adjacent said armature, and the portion of said armature adjacent said valve means is in relatively close-fitting relation to said housing thereby decreasing the volume of said interior fluid containing region between said armature and said check valve means.
Claim 19
Dependent Claim
66 words
A pump according to claim 14, wherein the cross-sectional dimension of said armature portion adjacent said check valve means and the cross-sectional size of the associated portion of said housing are so related to define a close tolerance space therebetween serving as a leakage path for fluid from said first pumping • chamber to said receiving chamber during movement of said armature through said return stroke.
Claim 20
Dependent Claim
83 words
A pump according to claim 13, wherein said housing includes a cylindrical portion adjacent said inlet and having a first inner diameter section containing said check valve means in relatively close-fitting relation and a second, smaller inner diameter section containing said first plunger portion of said armature in relatively close-fitting relation, said check valve means being closely coupled to and located closely adjacent said armature, thereby decreasing the volume of said interior fluid containing region between said armature and said check valve means.
Claim 21
Dependent Claim
56 words
A'pump according to claim 16, wherein the inner diameter of said second housing section and the outer diameter of said armature first plunger portion are so related to define a close tolerance space therebetween serving as a leakage path for fluid from said first pumping chamber to said receiving chamber during movement of said return stroke.
Claim 22
Dependent Claim
83 words
A pump according to claim 13, further including a body of magnetically permeable material in said housing fluid containing region between said first and second fluid pumping chambers, said body defining a portion of said magnetic circuit, said body having a passage therethrough for receiving said second armature plunger portion in a movable, relatively close-fitting relation whereby said armature moves in said body during said forward and return strokes and said magnetic circuit is through said body and said second armature plunger portion.
Claim 23
Dependent Claim
21 words
A pump according to claim 13, further including biasing means in said housing for urging said armature toward said rest position.
Claim 24
Dependent Claim
57 words
A pump according to claim 13, further including: a) first biasing means for urging said armature toward said rest position; b) second biasing means for urging said check valve means toward a position closing said inlet; and c) the force provided by said first biasing means being greater than the force provided by said second biasing means.
Claim 25
Dependent Claim
97 words
A pump according to claim 13, further including: a) first biasing means operatively associated with said armature for providing long term sealing of said pump inlet; b) second biasing means operatively associated with said check valve means for providing short term sealing of said pump inlet; and c) the force provided by said second biasing means being weaker than the force provided by said first biasing means; d) whereby sealing against back flow is provided when said pump is not in operation while pressure drop across said check valve means is relatively small during the pumping stroke.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.