# US 2019/0170147 A1 · Blower unit

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- Number: US 2019/0170147 A1
- Document ID: US20190170147A1
- Status: Published application
- Kind: A1
- Application number: 16/273,203
- Filed: 2019-02-12
- Published: 2019-06-06
- Earliest claimed: 2016-08-29
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Tatsuya SAKAI
- Web page: https://patentgrep.com/patent/US20190170147A1

## CPC

- F04D 25/082: {the unit having provision for cooling the motor}
- B60H 1/00471: {The ventilator being of the radial type, i.e. with radial expulsion of the air}
- F04D 17/16: for displacing without appreciable compression
- F04D 25/0606: {the electric motor being specially adapted for integration in the pump}
- F04D 29/4226: {Fan casings}
- F04D 29/5806: {Cooling the drive system}
- F04D 29/706: {Humidity separation}
- B60H 2001/003: {Component temperature regulation using an air flow}
- F05B 2240/14: Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within
- F05D 2260/602: Drainage
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A blower unit includes an electric motor, a fan, and a scroll casing. The scroll casing has a recess formed in an upper wall to define a nose portion where a scrolling of an air passage starts. The scroll casing has an air supply part communicating with a downstream side of the air passage in a flow of the air. The air supply part forms an air supply space to supply a part of the air flowing through the air passage to the electric motor. The scroll casing has a communication hole that causes an inside space of the recess and the air passage to communicate with each other without going through the air supply part. The air supply part has an intrusion suppressing portion configured to suppress entry of water into the air supply space.

## Claims

### Claim 1

A blower unit comprising:
an electric motor having a rotation shaft;
a fan that draws in air from one side in an axial direction of the rotation shaft and blows out the air in a radial direction of the rotation shaft; and
a scroll casing housing the fan and having an air passage, wherein
the scroll casing has
an upper wall having a suction port for drawing in air,
a recess formed in the upper wall to define a nose portion where a scrolling of the air passage starts,
an air supply part communicating with a downstream side of the air passage in a flow of the air, the air supply part forming an air supply space to supply a part of the air flowing through the air passage to the electric motor, and
a communication hole that causes an inside space of the recess and the air passage to communicate with each other without going through the air supply part, and
the air supply part has an intrusion suppressing portion configured to suppress entry of water into the air supply space.

### Claim 2 (depends on 1)

The blower unit according to claim 1, wherein
the air supply space communicates with the air passage via a supply opening formed in the air supply part, and
the intrusion suppressing portion includes at least one rib that closes a part of the supply opening located near the communication hole.

### Claim 3 (depends on 2)

The blower unit according to claim 2, wherein
the rib has a drain hole shaped in a slit extending in an up-down direction.

### Claim 4 (depends on 1)

The blower unit according to claim 1, wherein
the air supply space communicates with the air passage via a supply opening formed in the air supply part,
the intrusion suppressing portion has
a lower rib extending upward from a lower side of the supply opening, and
an upper rib extending downward from an upper side of the supply opening, and
the air supply space has a labyrinth structure defined by the lower rib and the upper rib.

### Claim 5 (depends on 4)

The blower unit according to claim 4, wherein
the lower rib has a drain hole shaped in a slit extending in an up-down direction.

### Claim 6 (depends on 1)

The blower unit according to claim 1, wherein
the scroll casing has
a side wall connected to the upper wall,
a bottom wall connected to the side wall to oppose the upper wall, and
a drainage guide groove extended from the communication hole toward the bottom wall.