# US 10,244,912 B2 · Vacuum cleaner with motor between separation stages

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- Number: US 10,244,912 B2
- Document ID: US10244912B2
- Status: Granted
- Kind: B2
- Application number: 14/919,600
- Filed: 2015-10-21
- Published: 2016-04-28
- Granted: 2019-04-02
- Earliest claimed: 2014-10-22
- Assignees: Dyson Technology Limited
- Applicants: Dyson Technology Limited
- Inventors: Charles Geoffrey Box; Mark Andrew Johnson
- Web page: https://patentgrep.com/patent/US10244912B2

## CPC

- A47L 9/2889: {Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user}
- A47L 5/22: with rotary fans
- A47L 9/1608: {Cyclonic chamber constructions}
- A47L 9/1616: {Multiple arrangement thereof}
- A47L 9/1633: {Concentric cyclones}
- A47L 9/1641: {for parallel flow}
- A47L 9/22: Mountings for motor fan assemblies
- H02K 9/06: with fans or impellers driven by the machine shaft
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A vacuum cleaner having a main body and a dirt separator that is removably attached to the main body. The dirt separator includes a first dirt-separation stage, a second dirt-separation stage, and a vacuum motor for moving air through the first dirt-separation stage and the second dirt-separation stage. The vacuum motor has an impeller driven by an electric motor. The first dirt-separation stage is then located upstream of the impeller, and the second dirt-separation stage is located downstream of the impeller.

## Claims

### Claim 1

A vacuum cleaner comprising a main body and a dirt separator removably attached to the main body, wherein the dirt separator comprises a first dirt-separation stage, a second dirt-separation stage, and a vacuum motor for moving air through the first dirt-separation stage and the second dirt-separation stage, the vacuum motor comprises an impeller driven by an electric motor, the first dirt-separation stage is located upstream of the impeller, and the second dirt-separation stage is located downstream of the impeller, and wherein the first dirt-separation stage comprises a single cyclonic separator, and second dirt-separation stage comprises a plurality of cyclonic separators.

### Claim 2 (depends on 1)

The vacuum cleaner of claim 1, wherein the cyclonic separator of the first dirt-separation stage comprises a central axis about which air within the cyclonic separator rotates, the vacuum motor comprises a rotational axis about which the impeller rotates, and the central axis and the rotational axis are coincident.

### Claim 3 (depends on 1)

The vacuum cleaner of claim 1, wherein the cyclonic separators of the second dirt-separation stage are arranged around the vacuum motor.

### Claim 4 (depends on 1)

The vacuum cleaner of claim 1, wherein the first dirt-separation stage comprises a first dirt collector, the second dirt-separation stage comprises a second dirt collector, and the first dirt collector surrounds the second dirt collector.

### Claim 5 (depends on 1)

The vacuum cleaner of claim 1, wherein the second dirt-separation stage comprises a plurality of cyclonic separators and a plurality of channels, each channel extending from an outlet of the vacuum motor to an inlet of a respective cyclonic separator.

### Claim 6 (depends on 5)

The vacuum cleaner of claim 5, wherein each channel has an inlet angle of at least 30 degrees.

### Claim 7 (depends on 5)

The vacuum cleaner of claim 5, wherein each channel is substantially straight.

### Claim 8 (depends on 1)

The vacuum cleaner of claim 1, wherein at least part of the air discharged from the second dirt-separation stage is used to cool the vacuum motor.

### Claim 9 (depends on 8)

The vacuum cleaner of claim 8, wherein at least part of the air discharged from the second dirt-separation stage is pushed through the interior of the vacuum motor so as to cool the electric motor.

### Claim 10 (depends on 8)

The vacuum cleaner of claim 8, wherein the vacuum motor has a first inlet, a first outlet, a second inlet and a second outlet, the first inlet is located upstream of the impeller, the first outlet is located downstream of the impeller and upstream of the second dirt-separation stage, the second inlet is located downstream of the second dirt-separation stage, the second outlet is located downstream of the second inlet, and at least part of the air discharged from the second dirt-separation stage enters the vacuum motor via the second inlet, flows over one or more components of the electric motor and exits the vacuum motor via the second outlet.