# US 11,905,959 B2 · Electric blower, vacuum cleaner, and hand drying device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,905,959 B2
- Document ID: US11905959B2
- Status: Granted
- Kind: B2
- Application number: 16/614,891
- Filed: 2017-08-04
- Published: 2020-07-02
- Granted: 2024-02-20
- Earliest claimed: 2017-08-04
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Kazuchika Tsuchida
- Web page: https://patentgrep.com/patent/US11905959B2

## CPC

- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- A47K 10/48: Drying by means of hot air
- F04D 25/082: {the unit having provision for cooling the motor}
- F04D 25/166: {using fans}
- F04D 29/043: Shafts
- F04D 29/046: Bearings
- F04D 29/051: Axial thrust balancing
- F04D 29/4246: {comprising more than one outlet}
- F04D 29/522: {especially adapted for elastic fluid pumps}
- F04D 29/541: {Specially adapted for elastic fluid pumps (F04D29/56 takes precedence)}
- F04D 29/5806: {Cooling the drive system}
- F04D 29/66: Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D27/02)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES

## Abstract

An electric blower includes a motor, a fan to generate a first air current, a fan to generate a second air current, and a housing. The first air current and the second air current are exhausted from the housing in opposite directions to each other in the axial direction.

## Claims

### Claim 1

An electric blower comprising:
a motor;
a first fan provided on one end side of the motor in an axial direction and to generate a first air current;
a second fan provided opposite to the first fan in the axial direction and to generate a second air current; and
a housing covering the motor, the first fan, and the second fan,
wherein the housing includes a first exhaust port and a second exhaust port that are formed on both sides in the axial direction, and
the first air current and the second air current are exhausted from the first exhaust port and the second exhaust port to an area outside of the electric blower in opposite directions to each other in the axial direction respectively.

### Claim 2 (depends on 1)

The electric blower according to claim 1, wherein a diameter of an inner end of the first fan in the axial direction is smaller than a diameter of an outer end of the first fan in the axial direction.

### Claim 3 (depends on 1)

The electric blower according to claim 1, wherein a diameter of an inner end of the second fan in the axial direction is smaller than a diameter of an outer end of the second fan in the axial direction.

### Claim 4 (depends on 1)

The electric blower according to claim 1, wherein the housing includes a suction port formed between the first fan and the second fan in the axial direction.

### Claim 5 (depends on 1)

The electric blower according to claim 1, wherein the motor includes a rotor to rotate the first fan and the second fan.

### Claim 6 (depends on 5)

The electric blower according to claim 5, wherein the motor includes
a shaft fixed to the rotor,
a bearing to rotatably support the shaft, and
a preload spring to apply a load in the axial direction to the bearing.

### Claim 7 (depends on 5)

The electric blower according to claim 5, wherein
the motor includes a motor housing covering the rotor, and
the motor housing includes a hole passing through the motor housing in a radial direction of the motor.

### Claim 8 (depends on 7)

The electric blower according to claim 7, wherein the motor includes a projecting portion provided on one end side in the axial direction and projecting from the motor housing in the radial direction of the motor.

### Claim 9 (depends on 1)

The electric blower according to claim 1, wherein a diameter of an outer end of the first fan in the axial direction is larger than a diameter of an outer end of the second fan in the axial direction.

### Claim 10 (depends on 1)

The electric blower according to claim 1, wherein a height of the first fan in the axial direction is higher than a height of the second fan in the axial direction.

### Claim 11 (depends on 1)

The electric blower according to claim 1, wherein
the housing includes:
a first fan cover covering the first fan; and
a second fan cover covering the second fan, and
a width between the first fan and the first fan cover is smaller than a width between the second fan and the second fan cover.