Dust collector with a constant suction force

• US 10,226,724 B2
• Filed: 07/11/2018
• Issued: 03/12/2019
• Est. Priority Date: 10/06/2011
• Status: Active Grant

• Current Assignee: Husqvarna AB (HUSQVARNA)
• Original Assignee: Husqvarna AB (HUSQVARNA)
• Inventors: Hallgren, Ingvar, Johansson, Daniel
• Primary Examiner(s): Hobson, Stephen
• Application Number:
  US16/032,900
• Publication Number:
  US 20180326336A1
• Time in Patent Office: 244 Days
• CPC Class Codes: B01D 45/12 by centrifugal forces centrifuges B04B; cyclones B04C
• CPC Class Codes: B01D 45/16 generated by the winding course of the gas stream , the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
• CPC Class Codes: B01D 45/18 Cleaning-out devices
• CPC Class Codes: B01D 46/2411 Filter cartridges
• CPC Class Codes: B01D 46/48 Removing dust other than cleaning filters , e.g. by using collecting trays
• CPC Class Codes: B01D 50/20 Combinations of devices covered by groups B01D45/00 and B01D46/00
• CPC Class Codes: B04C 2009/004 with internal filters, in the cyclone chamber or in the vortex finder
• CPC Class Codes: B04C 5/081 Shapes or dimensions
• CPC Class Codes: B04C 5/103 Bodies or members, e.g. bulkheads, guides, in the vortex chamber cores B04C5/107
• CPC Class Codes: B04C 5/185 Dust collectors
• CPC Class Codes: B04C 5/22 with cleaning means
• CPC Class Codes: B04C 7/00 Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00
• CPC Class Codes: B04C 9/00 Combinations with other devices, e.g. fans, expansion chambers, diffusors, water lockswith filters B01D50/00

Abstract

A separator provides mechanical separation of suspended particles or debris within a fluid. The separator includes a cylindrical body having an inlet pipe for directing the fluid generally tangentially into the cylindrical body, causing the fluid to spin around the inside diameter of the cylindrical body. An outlet pipe, having an outer diameter smaller than the inside diameter of the cylindrical body, can extend from a top end of the cylindrical body into the cylindrical body. Directional blades can be disposed on an outer surface of the outlet pipe, with a gap between the directional blades and the inside surface of the cylindrical body. A baffle dome disposed an a lower end of the cylindrical body slows down the fluid flow, causing the particles and debris to remain below the baffle and settle. The fluid then exits out the outlet pipe as a cleaned fluid.

Claims

1. A filter unit comprising:

a contaminated portion having an inlet;

a clean portion having an outlet fluidly coupled to the inlet;

a filter media disposed between the contaminated portion and the clean portion, the filter media being configured to filter fluid flowing therethrough from the contaminated portion to the clean portion;

an integrated pressure vessel containing fluid that is pressurized, the integrated pressure vessel being coupled to the clean portion;

a backflushing arrangement configured to backflush the filter media by releasing the fluid from the integrated pressure vessel into the clean portion such that the fluid flows through the filter media from the clean portion to the contaminated portion, the backflushing arrangement comprising a valve fluidly coupling the integrated pressure vessel to the clean portion;

a flexible filter hose lock coupled to the contaminated portion; and

a filter bottom member disposed between the flexible filter hose lock and the contaminated portion, wherein the filter bottom member is configured to prevent the flexible filter hose lock from being drawn into the contaminated portion when the fluid flows from the contaminated portion to the clean portion, and wherein the filter bottom member is further configured to allow dust particles to pass therethrough when the fluid flows from the clean portion to the contaminated portion.

2. The filter unit as recited in claim 1, wherein the backflushing arrangement is configured to backflush the filter media during operation of the filter unit.

3. The filter unit as recited in claim 1, wherein the integrated pressure vessel is configured to be rechargeable with pressurized fluid.

4. The filter unit as recited in claim 1, further comprising a programmable logic controller coupled to the valve, wherein the programmable logic controller is configured to control backflushing of the filter media.

5. The filter unit as recited in claim 4, wherein the programmable logic controller is configured to activate the backflushing of the filter media at a predetermined time interval between backflushing operations.

6. The filter unit as recited in claim 5, wherein the predetermined time interval is about 30 seconds.

7. The filter unit as recited in claim 4, further comprising one or more pressure sensors configured to detect a drop in pressure;

and wherein the programmable logic controller is configured to begin a backflushing operation when the pressure drop changes beyond a predetermined level.

8. The filter unit of claim 1, wherein the filter media is configured to remove very fine particles from fluid flowing therethrough from the contaminated portion to the clean portion, wherein the very fine particles are smaller than 0.2 millimeters in a largest dimension.

9. The filter unit of claim 1, wherein the inlet is configured to be fluidly coupled to an outlet of a dust collector.

10. The filter unit as recited in claim 1, further comprising a fastener coupling the clean portion to the contaminated portion.

11. The filter unit as recited in claim 10, wherein the contaminated portion is a disposable portion that can be disposed of in accordance with hazardous material handling procedures.

12. The filter unit as recited in claim 1, wherein the flexible filter hose lock is coupled to a bottom end of the contaminated portion.

13. The filter unit as recited in claim 12, wherein the flexible filter hose lock comprises a bag having a sealed end.