Control valve

Patent metadata

Field	Value
Publication number	US-10012024-B2
Application number	US-201514789030-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Jul 3, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A control valve for controlling flow of a pressure fluid in a breaking device includes a sleeve-like control valve having at least one opening enabling flow of the pressure fluid through the opening. The at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross section of the opening on the outer circumference of the control valve, such that the pressure fluid flowing through the opening may be arranged to rotate the control valve about the longitudinal axis of the control valve.

First claim

The invention claimed is:

1. A control valve for controlling flow of a pressure fluid in a breaking device, comprising
a sleeve shaped control valve arranged to control flow of the pressure fluid based on a percussion piston position, the valve including an outer surface, an inner surface; and
at least one opening extending from the inner surface of the control valve to the outer surface of the control valve enabling flow of the pressure fluid between the inside of the control valve and the outside of the control valve through the at least one opening, wherein the at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through a middle point of a cross-section of the at least one opening on an outer circumference of the control valve, and wherein a cross-sectional area of the at least one opening on the inner surface is substantially equal to or larger than a cross-sectional area of the at least one opening on the outer surface of the control valve, such that the pressure fluid flowing through the at least one opening rotates the control valve about a longitudinal axis of the control valve.

2. A control valve according to claim 1 , wherein the at least one wall having at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross-section of the at least one opening on the outer circumference of the control valve is arranged at an angle in relation to said radial direction of the control valve.

3. A control valve according to claim 2 , wherein the angle is between 5 degrees and 60 degrees.

4. A control valve according to claim 3 , wherein the angle is between 15 degrees and 45 degrees.

5. A control valve according to the claim 1 , wherein the at least one wall that is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross-section of the opening on the outer circumference of the control valve has a step shape.

6. A control valve as claimed in claim 1 , wherein the cross-sectional area of the at least one opening in the direction from the outside of the control valve towards the longitudinal axis of the control valve has a circular shape.

7. A control valve as claimed in claim 1 , wherein the cross-sectional area of the opening in the direction from the outside of the control valve towards the longitudinal axis of the control valve has a rectangular shape.

8. A control valve as claimed in claim 1 , wherein the at least one opening comprises a plurality of openings extending from the inner surface of the control valve to the outer surface of the control valve enabling flow of the pressure fluid between the inside of the control valve and the outside of the control valve, and wherein at least some of the openings have at least one wall that is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross-section of the opening on the outer circumference of the control valve.

9. A control valve according to claim 8 , wherein at least a group of the openings are spaced along the circumference of the control valve in an annular manner and wherein all the openings in the group include at least one wall that is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross-section of the opening on the outer circumference of the control valve.

10. A breaking device comprising a control valve as claimed in claim 1 , wherein the control valve is a distribution valve and wherein the at least one opening is arranged such that during at least one phase of the breaking device and one position of the piston of the breaking device pressure fluid flows from inside of the control valve to a discharge channel through the opening.

11. A rock drilling machine, comprising:
a percussion piston; and
a sleeve shaped control valve arranged to control flow of a pressure fluid based on a position of the percussion piston, the valve having an outer surface, an inner surface and at least one opening extending from the inner surface of the control valve to the outer surface of the control valve enabling flow of pressure fluid between the inside of the control valve and the outside of the control valve through the at least one opening, wherein the at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through a middle point of a cross-section of the at least one opening on an outer circumference of the control valve, and wherein a cross-sectional area of the at least one opening on the inner surface is substantially equal to or larger than a cross-sectional area of the at least one opening on the outer surface of the control valve, such that the pressure fluid flowing through the at least one opening rotates the control valve about a longitudinal axis of the control valve.

12. A breaking hammer, comprising:
a percussion piston; and
a sleeve shaped control valve arranged to control flow of the pressure fluid based on a position of the percussion piston, the valve having an outer surface, an inner surface and at least one opening extending from the inner surface of the control valve to the outer surface of the control valve enabling flow of pressure fluid between the inside of the control valve and the outside of the control valve through the at least one opening, wherein the at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through a middle point of a cross-section of the at least one opening on an outer circumference of the control valve, and wherein a cross-sectional area of the at least one opening on the inner surface is substantially equal to or larger than a cross-sectional area of the at least one opening on the outer surface of the control valve, such that the pressure fluid flowing through the at least one opening rotates the control valve about a longitudinal axis of the control valve.

Assignees

• Sandvik Mining & Construction Oy

Inventors

• Leino Timo
• Muuttonen Timo
• Koskimaki Antti
• Kotala Ari

Classifications

• F16K47/04

  for decreasing pressure {or noise level}, the throttle being incorporated in the closure member · CPC title

• E21B21/103

  Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus (valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints E21B21/019) · CPC title

• E21B4/06 Primary

  Down-hole impacting means, e.g. hammers (boring rams E21B11/02) · CPC title

• E21B4/14 Primary

  Fluid operated hammers · CPC title

• E21B21/08

  Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B21/10) · CPC title