Vacuum device for collecting light and heavy material

Patent metadata

Field	Value
Publication number	US-9874225-B2
Application number	US-201615092626-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 13, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A vacuum device has a motor-driven blower wheel with suction side and with pressure side with pressure channel and blow-out opening. An intake pipe at the suction side has an intake opening and a discharge opening at opposed ends. The intake pipe conveys a suction airflow entraining first and second collected materials. Through the discharge opening the first collected material is discharged from the intake pipe. A blower inlet opening is formed in a wall of the intake pipe. Blower inlet opening, blower wheel, and pressure channel are configured such that second collected material passes through blower inlet opening and blower wheel into the pressure channel for discharge through blow-out opening. The blower inlet opening, in longitudinal direction of the intake pipe, is positioned between discharge opening and intake opening at a first spacing to the intake opening and at a second spacing to the discharge opening.

First claim

What is claimed is:

1. A vacuum device comprising:
a motor;
a blower wheel operatively connected to the motor to be driven by the motor;
the blower wheel comprising a suction side and further comprising a pressure side;
an intake pipe arranged at the suction side of the blower wheel, the intake pipe comprising an intake opening at a first end of the intake pipe and an outlet opening at a second opposite end of the intake pipe, wherein the intake pipe conveys a suction air flow for picking up and entraining a first collected material and a second collected material;
the intake pipe comprising a discharge opening configured to discharge the first collected material from the intake pipe, wherein the outlet opening at the second end of the intake pipe is formed by the discharge opening;
the intake pipe comprising a blower inlet opening formed in a wall of the intake pipe for supplying air to the blower wheel;
a pressure channel comprising a blow-out opening, the pressure channel formed at the pressure side of the blower wheel;
wherein the blower inlet opening, the blower wheel, and the pressure channel are configured such that the second collected material passes through the blower inlet opening and the blower wheel into the pressure channel and is discharged through the blow-out opening by a discharge airflow conveyed in the pressure channel;
the blower inlet opening, viewed in a longitudinal direction of the intake pipe, is positioned between the discharge opening and the intake opening such that the blower inlet opening, viewed in the longitudinal direction of the intake pipe, is positioned at a first spacing relative to the intake opening and at a second spacing relative to the discharge opening.

2. The vacuum device according to claim 1 , wherein the first spacing, measured in the longitudinal direction of the intake pipe relative to the intake opening, is greater than the second spacing, measured in the longitudinal direction of the intake pipe relative to the discharge opening.

3. The vacuum device according to claim 1 , wherein the intake pipe comprises a straight pipe section and wherein the blower inlet opening is arranged in the straight pipe section of the intake pipe.

4. The vacuum device according to claim 3 , wherein the blower wheel rotates about an axis of rotation and wherein the axis of rotation is positioned transverse to a longitudinal center axis of the straight pipe section.

5. The vacuum device according to claim 3 , wherein the blower wheel rotates about an axis of rotation and wherein the axis of rotation extends parallel to a longitudinal center axis of the straight pipe section.

6. The vacuum device according to claim 1 , wherein the blower wheel is arranged in the wall of the intake pipe in the blower inlet opening.

7. The vacuum device according to claim 1 , wherein the blower wheel is positioned at an axial spacing to the blower inlet opening.

8. The vacuum device according to claim 1 , wherein the discharge opening and the blow-out opening open into a common collecting space.

9. The vacuum device according to claim 8 , wherein a back pressure existing in the pressure channel is decoupled from the suction pressure in the intake pipe.

10. The vacuum device according to claim 1 , further comprising a locking flap correlated with the discharge opening, wherein the discharge opening is closable by the locking flap.

11. The vacuum device according to claim 10 , wherein the locking flap is pivotable from an open position into a closed position by a vacuum generated in operation of the vacuum device.

12. The vacuum device according to claim 10 , wherein the locking flap is loaded by a spring force into a closed position.

13. The vacuum device according to claim 1 , wherein a size of a flow cross-section of the intake opening of the intake pipe is greater than a size of a flow cross-section of the discharge opening of the intake pipe.

14. The vacuum device according to claim 13 , wherein the blow-out opening of the pressure channel is designed such that a suction air flow from the intake pipe into a collecting space arranged downstream of the discharge opening is enhanced.

15. The vacuum device according to claim 1 , wherein the intake pipe and the pressure channel are formed as flow passages that are constructively separated from each other.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Langhans Klaus
• Seidel Tilman
• Hegenbart Christoph
• Kuschewski Mario
• Schlötzer Oliver

Classifications

• F04D17/16

  for displacing without appreciable compression · CPC title

• F04D25/08 Primary

  the working fluid being air, e.g. for ventilation · CPC title

• A47L5/14

  cleaning by blowing-off, also combined with suction cleaning · CPC title

• F04D19/002

  Axial flow fans · CPC title

• F04D29/701

  especially adapted for elastic fluid pumps · CPC title