Bidirectionally flow-impinged device for measuring flow processes of fluids

Patent metadata

Field	Value
Publication number	US-10634138-B2
Application number	US-201615759522-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 15, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A device for measuring flow processes of fluids includes an inlet, an outlet, a housing in which is arranged a drivable positive displacement flow meter which includes a positive displacement chamber in which a driven impeller is rotatably arranged, a first supply duct connecting the displacement chamber with the inlet, a first discharge duct connecting the displacement chamber with the outlet, a first inlet port, a second supply duct connected to the inlet, a displacement flow meter bypass with a differential pressure sensor, and an evaluation and control unit which controls the displacement flow meter based on a differential pressure applied to the pressure sensor. Cavitation wear of the positive displacement meter is reduced by the first supply duct opening into a front of the displacement chamber via the first inlet port, and the second supply duct opening into a rear of the displacement chamber via a second inlet port.

First claim

What is claimed is:

1. A device for measuring flow processes of fluids, the device comprising:
an inlet;
an outlet;
a housing;
a drivable positive displacement flow meter arranged in the housing, the drivable positive displacement flow meter comprising a positive displacement chamber formed therein in which at least one driven impeller is rotatably arranged;
a first supply duct fluidically connecting the positive displacement chamber with the inlet;
a first discharge duct fluidically connecting the positive displacement chamber with the outlet;
a first inlet port via which the first supply duct is configured to open into a front of the positive displacement chamber;
a second inlet port;
a second supply duct fluidically connected to the inlet, the second supply duct being configured to open into a rear of the positive displacement chamber via the second inlet port;
a bypass configured to bypass the drivable positive displacement flow meter;
a differential pressure sensor arranged in the bypass; and
an evaluation and control unit configured to provide a control of the drivable positive displacement flow meter based on a differential pressure applied to the differential pressure sensor.

2. The device as recited in claim 1 , further comprising:
a first outlet port;
a second outlet port; and
a second discharge duct,
wherein,
the first discharge duct is arranged to open into the front of the positive displacement chamber via the first outlet port, and
the second discharge duct is arranged to open into the rear or the positive displacement chamber via the second outlet port.

3. The device as recited in claim 2 , wherein,
the differential pressure sensor comprises a measuring chamber,
the housing is provided as a bipartite structure comprising a first housing part and a second housing part,
the positive displacement chamber is arranged in the first housing part,
at least one of the first inlet port and the first outlet port is arranged in the second housing part,
the measuring chamber of the differential pressure sensor is arranged in the second housing part, and
the positive displacement chamber is closed by the second housing part.

4. The device as recited in claim 2 , wherein at least one of,
the first inlet port and the second inlet port, and
the first outlet port and the second outlet port,
are formed so as to have a kidney-shape at the front and at the rear of the housing part delimiting the positive displacement chamber.

5. The device as recited in claim 4 , wherein,
the at least one driven impeller comprises tooth roots,
the drivable positive displacement flow meter is provided as a gear pump, and
the at least one of,
the first inlet port and the second inlet port, and
the first outlet port and the second outlet port,

which are formed so as to have the kidney-shape are arranged to extend radially outward to the tooth roots of the at least one driven impeller.

6. The device as recited in claim 2 , wherein at least one of the first inlet port and the first outlet port at the front of the positive displacement chamber is formed as a mirror image of at least one of the second inlet port and the second outlet port at the rear of the positive displacement chamber.

7. The device as recited in claim 2 , further comprising:
connection ducts arranged in the housing,
wherein,
the inlet and the outlet are each formed at the housing,
at least one of the,
first supply duct and the second supply duct, and
the first discharge duct and the second discharge duct,

are fluidically connected with each other via the connection ducts arranged in the housing, and
at least one of,
both the first supply duct and the second supply duct, and
both the first discharge duct and the second discharge duct,

are fluidically connected, via the connection ducts, with at least one of the inlet and the outlet formed at the housing.

8. The device as recited in claim 2 , wherein,
the positive displacement chamber comprises a front wall and a rear wall which delimit the positive displacement chamber at the front and at the rear, respectively, and
at least one of,
the first inlet port and the second inlet port, and
the first outlet port and the second outlet port,

in the positive displacement chamber are milled into the respective front wall and rear wall.

9. The device as recited in claim 8 , wherein,
the first housing part comprises a receiving opening, and
a sleeve is configured to form the positive displacement chamber, the sleeve being inserted into the receiving opening.

10. The device as recited in claim 9 , wherein,
the sleeve comprises the rear wall that delimits the positive displacement chamber at the rear, and
at least one of the second inlet port and the second outlet port are formed in the rear wall.

11. The device as recited in claim 10 , wherein,
the sleeve further comprises a radially delimiting outer wall, and
the second supply duct and the second discharge duct are formed at least in part in the rear wall that delimits the positive displacement chamber at the rear and in the radially delimiting outer wall of the sleeve.

12. The device as recited in claim 11 , further comprising:
grooves formed in a radial outer side of the radially delimiting outer wall of the sleeve, the grooves being arranged to form a respective section of the second supply duct and of the second discharge duct which are closed to the radial outer side by the first housing part.

Assignees

• Avl List Gmbh

Inventors

• Derschmidt Otfried
• Kammerstetter Heribert

Classifications

• G01F15/026

  using means to maintain zero differential pressure across the motor (G01F1/08 and G01F1/12 take precedence) · CPC title

• F04C2270/16

  Wear · CPC title

• F04C2/10 Primary

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title

• F04C15/06 Primary

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

• F04C2/344

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