Device for choking a fluid flow and corresponding piston pump for delivering fluids

Patent metadata

Field	Value
Publication number	US-10247176-B2
Application number	US-201514933850-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 6, 2014
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A device for choking a fluid flow, with a pot-like base body, in the base of which a first passage opening is arranged, and a closing body guided axially moveably in the pot-like base body against a spring force of a spring element and having a second passage opening that forms a static choke point with a predefined fixed opening cross section. The closing body in combination with the spring element and the first passage opening forms a dynamic choke point with a dynamic opening cross section that is variably adjustable depending on a pressure difference.

First claim

What is claimed is:

1. A device for choking a fluid flow, comprising:
a pot-like base body including a base having a first passage opening;
a spring element;
a closing body guided axially moveably in the pot-like base body against a spring force of the spring element and having a second passage opening configured to form a static choke point with a predefined fixed opening cross section;
a delay device configured to delay a closing movement of the closing body in a targeted fashion,
wherein the closing body in combination with the spring element and the first passage opening forms a dynamic choke point with a dynamic opening cross section that is variably adjustable depending on a pressure difference, and
wherein the delay device has a friction element with a lip which is arranged between the closing body and an inner wall of the pot-like base body and creates a direction-dependent friction.

2. The device according to claim 1 , wherein the friction element is arranged in a receiver in the closing body or is molded onto the closing body such that the lip of the friction element is guided on the inner wall of the pot-like base body.

3. The device according to claim 2 , wherein the friction element has a lower friction value in an opening direction of the closing body and a higher friction value in a closing direction of the closing body.

4. A piston pump for delivering fluids, comprising:
a piston;
a pump cylinder;
a pressure chamber arranged between an inlet valve and an outlet valve; and
a device for choking a fluid flow, the device located downstream of the outlet valve in the fluid flow, the device including (i) a pot-like base body including a base having a first passage opening, (ii) a spring element, (iii) a closing body guided axially moveably in the pot-like base body against a spring force of the spring element and having a second passage opening configured to form a static choke point with a predefined fixed opening cross section, and (iv) a delay device configured to delay a closing movement of the closing body in a targeted fashion,
wherein the closing body in combination with the spring element and the first passage opening forms a dynamic choke point with a dynamic opening cross section that is variably adjustable depending on a pressure difference.

5. The piston pump according to claim 4 , wherein the delay device is configured such that in a first operating mode of the piston pump, the static choke point is disabled after a predefined number of pump strokes and bridged by a bypass formed by the dynamic choke point.

6. The piston pump according to claim 5 , wherein the delay device is configured such that in a second operating mode, the static choke point is enabled and causes a pressure-independent choking of the fluid flow.

7. The piston pump according to claim 6 , wherein the piston pump has a higher flow rate in the first operating mode and a lower flow rate in the second operating mode.

Assignees

• Bosch Gmbh Robert

Inventors

• Steingass Stephan
• Gaertner Oliver
• Hennig Oliver
• Kocourek Vaclav

Classifications

• Y10T137/7847

  With leak passage · CPC title

• F04B1/0452

  Distribution members, e.g. valves (machines or pumps with cam-actuated distribution members at the outer ends of the cylinders F04B1/0472; machines or pumps with cam-actuated distribution members at the inner ends of the cylinders F04B1/0531; the piston-driving cams being provided with inlets and outlets F04B1/0535) · CPC title

• F04B53/108

  Valves characterised by the material · CPC title

• F04B53/10

  Valves; Arrangement of valves · CPC title

• F04B1/0404

  Details or component parts · CPC title