US3887341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for automatic cleaning of an air filter
Assignee: Luwa Ltd
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Filing: 1973-01-15
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Granted: 1975-06-03
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Expires: 1993-01-15
Abstract
Abstract A method of and apparatus for automatically cleaning an air filter wherein a working air current containing contaminants is guided in a predetermined direction through the air filter, then during the cleaning of the filter impinging the filter with a cleaning air current which flows in a direction opposite to the direction of flow of the working air current. The cleaning air current impinges the filter in the form of a shock wave, and the energy of the shock wave is derived from the working air current.
Inventors
- 👤 Hanspeter Sutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:14
CPC Classifications
B; B01; B01D; B01D46/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
A method for automatically cleaning an air filter, comprising the steps of guiding a working air current containing contaminants in a predetermined direction of travel through the air filter from an upstream side to a downstream side thereof, suddenly deflecting a part of the working air current which has passed the downstream side of the filter to impinge the filter in the form of a shock wave at the downstream side of said filter, partially shutting off the working air current flowing on the downstream side of the filter and traveling in said predetermined direction, and deriving the energy of the shock wave from the working air current due to the sudden deflection of the part of the working air current.
Claim 2
Independent Claim
121 words
A method for automatically cleaning an air filter, comprising the steps of guiding a working air current containing contaminants in a predetermined direction of travel through the air filter from an upstream side to a downstream side thereof, suddenly deflecting a part of the working air current which has passed the downstream side of the filter to impinge the filter in the form of a shock wave at the downstream side of said filter, partially shutting off the working air current flowing on the downstream side of the filter and traveling in said predetermined direction, and deriving the energy of the shock wave from the working air current due to the sudden deflection of the part of the working air current.
Claim 3
Independent Claim
121 words
A METHOD FOR AUTOMATICALLY CLEANING AN AIR FILTER, COMPRISING THE STEPS OF GUIDING A WORKING AIR CURRENT CONTAINING CONTAMINANTS IN A PREDETERMINED DIRECTION OF TRAVEL THROUGH THE AIR FILTER FROM AN UPSTREAM SIDE TO A DOWNSTREAM SIDE THEREOF, SUDDENLY DEFLECTING A PART OF THE WORKING AIR CURRENT WHICH HAS PASSED THE DOWNSTREAM SIDE OF THE FILTER TO IMPINGE THE FILTER IN THE FORM, OF A SHOCK WAVE AT THE DOWNSTREAM SIDE OF SAID FILTER, PARTIALLY SHUTTING OFF THE WORKING AIR CURRENT FLOWING ON THE DOWNSTREAM SIDE OF THE FILTER AND TRAVELING IN SAID PREDETERMINED DIRECTION, AND DERIVING THE ENERGY OF THE SHOCK WAVE FROM THE WORKING AIR CURRENT DUE TO THE SUDDEN DEFLECTION OF THE PART OF THE WORKING AIR CURRENT.
Claim 4
Independent Claim
121 words
A METHOD FOR AUTOMATICALLY CLEANING AN AIR FILTER, COMPRISING THE STEPS OF GUIDING A WORKING AIR CURRENT CONTAINING CONTAMINANTS IN A PREDETERMINED DIRECTION OF TRAVEL THROUGH THE AIR FILTER FROM AN UPSTREAM SIDE TO A DOWNSTREAM SIDE THEREOF, SUDDENLY DEFLECTING A PART OF THE WORKING AIR CURRENT WHICH HAS PASSED THE DOWNSTREAM SIDE OF THE FILTER TO IMPINGE THE FILTER IN THE FORM, OF A SHOCK WAVE AT THE DOWNSTREAM SIDE OF SAID FILTER, PARTIALLY SHUTTING OFF THE WORKING AIR CURRENT FLOWING ON THE DOWNSTREAM SIDE OF THE FILTER AND TRAVELING IN SAID PREDETERMINED DIRECTION, AND DERIVING THE ENERGY OF THE SHOCK WAVE FROM THE WORKING AIR CURRENT DUE TO THE SUDDEN DEFLECTION OF THE PART OF THE WORKING AIR CURRENT.
Claim 5
Dependent Claim
55 words
The method as defined in claim 1, wherein the step of suddenly deflecting a part of the working air current includes the step of directing the part of working air current along a direction of travel differing from said predetermined direction of travel and in a direction toward the downstream side of the air filter.
Claim 6
Independent Claim
170 words
An apparatus for automatically cleaning an air filter, comprising a filter housing, an air filter within the filter housing dividing said filter housing into a raw air compartment and a clean air compartment, an inlet opening communicating with the raw air compartment, a blower having a suction side and a pressure side, the suction side of the blower being in flow communication with the clean air compartment, deflecting means mounted for movement between two positions, said deflecting means in one position communicating the pressure side of the blower with the atmosphere, said deflecting means in the other position communicating the pressure side of the blower with the clean air compartment and providing a bypass flow path from the pressure side of the blower to the clean air compartment during cleaning of the filter, means for at least partially shutting-off the suction side of the blower with respect to at least a portion of the clean air compartment, and means for simultaneously actuating the shut-off means together with the deflecting means.
Claim 7
Independent Claim
170 words
An apparatus for automatically cleaning an air filter, comprising a filter housing, an air filter within the filter housing dividing said filter housing into a raw air compartment and a clean air compartment, an inlet opening communicating with the raw air compartment, a blower having a suction side and a pressure side, the suction side of the blower being in flow communication with the clean air compartment, deflecting means mounted for movement between two positions, said deflecting means in one position communicating the pressure side of the blower with the atmosphere, said deflecting means in the other position communicating the pressure side of the blower with the clean air compartment and providing a bypass flow path from the pressure side of the blower to the clean air compartment during cleaning of the filter, means for at least partially shutting-off the suction side of the blower with respect to at least a portion of the clean air compartment, and means for simultaneously actuating the shut-off means together with the deflecting means.
Claim 8
Independent Claim
170 words
AN APPARATUS FOR AUTOMATICALLY CLEANING AN AIR FILTER, COMPRISING A FILTER HOUSING, AN AIR FILTER WITHIN THE FILTER HOUSING DIVIDING SAID FILTER HOUSING INTO A RAW AIR COMPARTMENT AND A CLEAN AIR COMPARTMENT, AN INLET OPENING COMMUNICATING WITH THE RAW AIR COMPARTMENT, A BLOWER HAVING A SUCTION SIDE AND A PRESSURE SIDE, THE SUCTION SIDE OF THE BLOWER BEING IN FLOW COMMUNICATION WITH THE CLEAN AIR COMPARTMENT, DEFLECTING MEANS MOUNTED FOR MOVEMENT BETWEEN TWO POSITIONS, AND DEFLECTING MEANS IN ONE POSITION COMMUNICATING THE PRESSURE SIDE OF THE BLOWER WITH THE ATMOSPHERE, SAID DEFLECTING MEANS IN THE OTHER POSITION COMMUNICATING THE PRESSURE SIDE OF THE BLOWER WITH THE CLEAN AIR COMPARTMENT AND PROVIDING A BYPASS FLOW PATH FROM THE PRESSURE SIDE OF THE BLOWER TO THE CLEAN AIR COMPARTMENT DURING CLEANING OF THE FILTER, MEANS FOR AT LEAST PARTIALLY SHUTTING-OFF THE SUCTION SIDE OF THE BLOWER WITH RESPECT TO AT LEAST A PORTION OF THE CLEAN AIR COMPARTMENT, AND MEANS FOR SIMULTANEOUSLY ACTUATING THE SHUT-OFF MEANS TOGETHER WITH THE DEFLECTING MEANS.
Claim 9
Independent Claim
170 words
AN APPARATUS FOR AUTOMATICALLY CLEANING AN AIR FILTER, COMPRISING A FILTER HOUSING, AN AIR FILTER WITHIN THE FILTER HOUSING DIVIDING SAID FILTER HOUSING INTO A RAW AIR COMPARTMENT AND A CLEAN AIR COMPARTMENT, AN INLET OPENING COMMUNICATING WITH THE RAW AIR COMPARTMENT, A BLOWER HAVING A SUCTION SIDE AND A PRESSURE SIDE, THE SUCTION SIDE OF THE BLOWER BEING IN FLOW COMMUNICATION WITH THE CLEAN AIR COMPARTMENT, DEFLECTING MEANS MOUNTED FOR MOVEMENT BETWEEN TWO POSITIONS, AND DEFLECTING MEANS IN ONE POSITION COMMUNICATING THE PRESSURE SIDE OF THE BLOWER WITH THE ATMOSPHERE, SAID DEFLECTING MEANS IN THE OTHER POSITION COMMUNICATING THE PRESSURE SIDE OF THE BLOWER WITH THE CLEAN AIR COMPARTMENT AND PROVIDING A BYPASS FLOW PATH FROM THE PRESSURE SIDE OF THE BLOWER TO THE CLEAN AIR COMPARTMENT DURING CLEANING OF THE FILTER, MEANS FOR AT LEAST PARTIALLY SHUTTING-OFF THE SUCTION SIDE OF THE BLOWER WITH RESPECT TO AT LEAST A PORTION OF THE CLEAN AIR COMPARTMENT, AND MEANS FOR SIMULTANEOUSLY ACTUATING THE SHUT-OFF MEANS TOGETHER WITH THE DEFLECTING MEANS.
Claim 10
Dependent Claim
74 words
The apparatus as defined in claim 3, including an exhaust shaft connected to the pressure side of the blower and wherein said deflecting means in said one position communicating the flow from the pressure side of the blower with atmospheric via the exhaust shaft and said deflecting means in said other position closing off the pressure side of the blower with respect to the exhaust shaft and terminating the flow through said exhaust shaft.
Claim 11
Dependent Claim
85 words
The apparatus as defined in claim 3, wherein the shut-off means comprises a flap member arranged in the clean air compartment and adapted to be actuated to a filter cleaning position in which the clean air compartment is subdivided into two parts, wherein a first part of such clean air compartment is connected with the suction side of the blower and the second part thereof is connected via an opening with the pressure side of the blower, said opening being controlled by the deflecting means.
Claim 12
Dependent Claim
65 words
The apparatus as defined in claim 5, further including an auxiliary filter having a clean air side and a raw air side, said clean air side of the auxiliary filter communicating with the first part of the clean air compartment, and means operatively associated with the raw air side of the auxiliary filter for communicating the flow of said inlet opening to said auxiliary filter.
Claim 13
Dependent Claim
35 words
The apparatus as defined in claim 6, wherein the operatively associated means is adapted to be actuated to a position in which the flow of said inlet opening to said auxiliary filter is shut off.
Claim 14
Dependent Claim
43 words
The apparatus as defined in claim 3, furTher including a suction conduit connected with the raw air compartment, and means for at least partially shutting-off the inlet opening from the raw air compartment and simultaneously communicating the inlet opening with the suction conduit.
Claim 15
Dependent Claim
25 words
The apparatus as defined in claim 3, wherein the clean air compartment, at the suction side of the blower, possesses a closable air inlet opening.
Claim 16
Independent Claim
158 words
An apparatus for automatically cleaning an air filter, comprising a filter housing, an air filter within the filter housing dividing said filter housing into a raw air compartment and a clean air compartment, an inlet opening communicating with the raw air compartment, a blower having a suction side and a pressure side, the suction side of the blower being in flow communication with the clean air compartment, deflecting means mounted for movement between two positions, said deflecting means in one position communicating the pressure side of the blower with the atmosphere, said deflecting means in the other position communicating the pressure side of the blower with the clean air compartment and providing a by-pass flow path from the pressure side of the blower to the clean air compartment during cleaning of the filter, and means for at least partially shutting-off the suction side of the blower with respect to at least a portion of the clean air compartment.
Claim 17
Independent Claim
158 words
An apparatus for automatically cleaning an air filter, comprising a filter housing, an air filter within the filter housing dividing said filter housing into a raw air compartment and a clean air compartment, an inlet opening communicating with the raw air compartment, a blower having a suction side and a pressure side, the suction side of the blower being in flow communication with the clean air compartment, deflecting means mounted for movement between two positions, said deflecting means in one position communicating the pressure side of the blower with the atmosphere, said deflecting means in the other position communicating the pressure side of the blower with the clean air compartment and providing a by-pass flow path from the pressure side of the blower to the clean air compartment during cleaning of the filter, and means for at least partially shutting-off the suction side of the blower with respect to at least a portion of the clean air compartment.
Claim 18
Dependent Claim
74 words
The apparatus as defined in claim 10, including an exhaust shaft connected to the pressure side of the blower and wherein said defelecting means in said one position communicating the flow from the pressure side of the blower with atmosphere via the exhaust shaft and said deflecting means in said other position closing off the pressure side of the blower with respect to the exhaust shaft and terminating the flow through said exhaust shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |