Dry-running gas vane pump having a first fluid outlet and a second fluid outlet associated with the pump chamber with the second fluid outlet permanently open to atmosphere without being impeded

Patent metadata

Field	Value
Publication number	US-10995757-B2
Application number	US-201716310817-A
Country	US
Kind code	B2
Filing date	Feb 1, 2017
Priority date	Jun 22, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A dry-running vane gas pump includes a pump housing which forms a pump chamber, a pump rotor with at least one displaceable slide element which pump rotor is rotatably supported in the pump chamber, at least one fluid inlet opening associated with the pump chamber, a first fluid outlet opening associated with the pump chamber, a second fluid outlet opening associated with the pump chamber, and a non-return valve which closes the first fluid outlet opening. The second fluid outlet opening is permanently open. The first fluid outlet opening is arranged before the second fluid outlet opening in a direction of rotation of the pump rotor.

First claim

What is claimed is:

1. A dry-running vane gas pump comprising:
a pump housing configured to form a pump chamber;
a pump rotor comprising at least one displaceable slide element, the pump rotor being rotatably supported in the pump chamber;
at least one fluid inlet opening associated with the pump chamber;
a first fluid outlet opening associated with the pump chamber;
a second fluid outlet opening associated with the pump chamber, the second fluid outlet opening being configured to be permanently open so that air flows out of the pump chamber via the second fluid outlet opening to atmosphere without being impeded; and
a non-return valve configured to close the first fluid outlet opening, wherein,
the first fluid outlet opening is arranged before the second fluid outlet opening in a direction of rotation of the pump rotor.

2. The dry-running vane gas pump as recited in claim 1 , wherein,
the pump rotor comprises at least two of the at least one displaceable slide element, and
the at least two of the at least one displaceable slide element are supported in the pump rotor.

3. The dry-running vane gas pump as recited in claim 2 , wherein,
a fluid opening angle exists between the first fluid outlet opening and the second fluid outlet opening as measured from a center of the pump rotor,
a pumping compartment angle exists between adjacent displaceable slide elements of the at least two of the at least one displaceable slide element as measured from the center of the pump rotor, and
the fluid opening angle is smaller than the pumping compartment angle.

4. The dry-running vane gas pump as recited in claim 1 , wherein,
the at least one displaceable slide element comprises a head, and
at least the head of the at least one displaceable slide element is made of graphite.

5. The dry-running vane gas pump as recited in claim 1 , wherein,
the pump housing comprises a valve cover, a stroke ring and a bottom cover,
the valve cover, the stroke ring and the bottom cover together define the pump chamber, and
the valve cover is configured to comprise the first fluid outlet opening and the second fluid outlet opening.

6. The dry-running vane gas pump as recited in claim 5 , wherein the bottom cover comprises the fluid inlet opening.

7. The dry-running vane gas pump as recited in claim 1 , wherein the non-return valve is a reed valve which comprises a path delimiter.

Assignees

• Pierburg Pump Technology Gmbh

Inventors

• Gruene Tobias
• Al-Hasan Nabil Salim
• Schnurr Steffen

Classifications

• F04C29/126

  of the non-return type · CPC title

• F04C2250/20

  of the rotor · CPC title

• F04C18/344

  with vanes reciprocating with respect to the inner member · CPC title

• F04C29/12 Primary

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C29/065

  Noise dampening volumes, e.g. muffler chambers · CPC title