Portable air-blowing working machine

• US 6,109,865 A
• Filed: 11/13/1998
• Issued: 08/29/2000
• Est. Priority Date: 11/14/1997
• Status: Expired due to Fees

• Current Assignee: Kioritz Corporation (Yamabiko Corporation)
• Original Assignee: Kioritz Corporation (Yamabiko Corporation)
• Inventors: Ishikawa, Takeshi
• Primary Examiner(s): Moulis, Thomas N.
• Application Number:
  US09/191,820
• Time in Patent Office: 655 Days
• Field of Search: 417/234, 417/350, 417/423.1, 417/423.5, 415/54.1, 415/57.2, 415/57.3, 415/57.4, 415/58.1, 415/59.1, 415/98-100
• US Class Current: 415/98
• CPC Class Codes: A01G 20/47 Vacuum or blower devices
• CPC Class Codes: A47L 5/14 cleaning by blowing-off, also combined with suction cleaning
• CPC Class Codes: A47L 9/0081 Means for exhaust-air diffusion; Means for sound or vibration damping
• CPC Class Codes: A47L 9/22 Mountings for motor fan assemblies
• CPC Class Codes: E01H 1/0809 Loosening or dislodging by blowing combined with suction E01H1/0863; with steam E01H1/10; removing snow by blowing E01H5/106; cleaning rails by blowing E01H8/105, E01H8/125; removing fog by blowing E01H13/00; cleaning joints in road construction by blowing E01C23/0906; Drying by means of gas streams by heat only E01H1/08; combined with snow or ice melting E01H5/10, E01H5/106, E01H5/108
• CPC Class Codes: F04D 17/12 Multi-stage pumps
• CPC Class Codes: F04D 25/02 Units comprising pumps and their driving means

Abstract

A portable air-blowing working machine includes a prime mover and an air-blowing system. The air-blowing system incorporates first-stage and second-stage centrifugal air-blowing sections, which are rotatably driven by an output shaft of the prime mover and are interconnected by an air-blowing passage for delivering air discharged from the first-stage air-blowing section to the intake of the second-stage. In operation, external air is drawn into the first-stage air-blowing section, increased therein in velocity and pressure, and then continuously discharged via the air-blowing passage to the second-stage air-blowing section, where the air is further accelerated and compressed before being finally discharged to the atmosphere.

Claims

1. A portable air-blowing working machine, comprising:

a prime mover having a rotatable output drive shaft;

a centrifugal first-stage air-blowing section driven by said rotatable output drive shaft for drawing in external air and increasing the velocity and pressure thereof;

at least one air-discharge outlet in said centrifugal first-stage air-blowing section;

a centrifugal second-stage air-blowing section driven by said rotatable output drive shaft for receiving air discharged from said air-discharge outlet and further increasing the velocity and pressure thereof;

an air-blowing passage interconnecting said at least one air-discharge outlet of said centrifugal first-stage air-blowing section with said centrifugal second-stage air-blowing section for communicating air discharged from said centrifugal first-stage air-blowing section to said centrifugal second-stage air-blowing section; and

an air-discharge port for discharging air from said centrifugal second-stage air-discharge section to the atmosphere.

2. The portable air-blowing working machine according to claim 1, wherein:

said first-stage air-blowing section and said second-stage air-blowing section have respective air-intake ports arranged such that said respective air-intake ports open facing in the same axial direction relative to the axis of said output shaft; and

said first-stage air-blowing section and said second-stage air-blowing section are coupled to each other in series, with said air-blowing passage leading from said at least one air-discharge outlet of said first-stage air-blowing section to said air-intake port of said second-stage air-blowing section.

3. The portable air-blowing working machine according to claim 1, wherein;

said first-stage air-blowing section and said second-stage air-blowing section have respective air-intake ports and are arranged such that said respective air-intake ports thereof open facing in opposite axial directions relative to the axis said output drive shaft; and

said first-stage air-blowing section and said second-stage air-blowing section are coupled to each other in a back-to-back configuration, with said air-blowing passage leading from said at least one air-discharge outlet of said first-stage air-blowing section to said air-intake port of said second stage air-blowing section.

4. The portable air-blowing working machine according to any one of claims 1 to 3, wherein:

said prime mover is an air-cooled two-stroke gasoline engine; and

said first-stage air-blowing section and said second-stage air-blowing section are drivingly connected to a rotatable output drive shaft of said engine.

5. A portable air-blowing working machine, comprising:

a prime mover having a rotatable output shaft;

a first-stage air-blowing section having an air-intake port, a centrifugal fan drivably connected to said output shaft and an at least one air-discharge outlet;

a second-stage air-blowing section having an air-intake port, a centrifugal fan drivably connected to said output shaft and an air discharge outlet; and

an air-blowing passage communicating with said at least one air-discharge outlet of said first-stage air-blowing section and said air-intake port of said second-stage air-blowing section for conveying air discharged from said first-stage air-blowing section to said second-stage air-blowing section.

6. The portable air-blowing machine according to claim 5, wherein:

said first-stage air-blowing section and said second-stage air-blowing section are arranged back-to-back in the axial direction of said drive shaft, with said second-stage air-blowing section being adjacent to said prime mover; and

said air-intake ports of said first-stage air-blowing section and said second-stage air-blowing section open in opposite axial directions.

7. The portable air-blowing machine according to claim 6, wherein:

said air-intake ports of said first-stage air-blowing and said second-stage air-blowing section are located adjacent said output shaft;

said at least one air-discharge outlet of said first-stage air-blowing section is located adjacent the circumferential periphery of said first stage air-blowing section; and

said air-blowing passage extends radially inwardly and axially between said prime mover and said second-stage air-blowing section to communicate air discharged from said at least one air-discharge outlet of said first-stage air-blowing section to said air-intake port of said second-stage air-blowing section.

8. The portable air-blowing machine according to claim 6, wherein:

said first-stage air-blowing section and said second-stage air-blowing section are axially separated by a common radially extending main disk plate, said common disk plate being rotatably driven by said output shaft; and

said centrifugal fans of said first-stage air-blowing section and said second-stage air-blowing section are carried back-to-back on opposite axial sides of said common disk plate.

9. The portable air-blowing machine according to claim 8, wherein:

said first-stage air-blowing section and said second-stage air blowing section form a circumferential groove that opens radially inwardly towards the axis of said output shaft; and

the radially outer periphery of said common disk plate extends into said circumferential groove and defines therewith a labyrinth seal.