Bypass valve technology interface safety screen

Patent metadata

Field	Value
Publication number	US-9550136-B2
Application number	US-201414198274-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Mar 5, 2014
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A safety screen assembly includes a shroud sleeve with an upstream end that defines a flow inlet. A spring seat is disposed downstream from the shroud sleeve and includes a flow outlet. A screen spool is operatively disposed between the flow inlet and the flow outlet and includes a tubular body with an inner passage, a screen disposed within the inner passage, and a plurality of bypass passages formed in the tubular body. The tubular body is in sliding engagement with the shroud sleeve in both a first position and a second position, the shroud sleeve closing the plurality of bypass passages from fluid flow when the tubular body is in the first position, and the plurality of bypass passages being open to fluid flow when the tubular body is in the second position. A spring biases the tubular body of the screen spool toward the first position.

First claim

The invention claimed is:

1. A safety screen assembly suitable for use within a fluid passage, the safety screen assembly comprising:
a shroud sleeve, the shroud sleeve comprising:
an upstream end that defines a flow inlet of the safety screen assembly; and
a flange disposed at the upstream end of the shroud sleeve;

a spring seat disposed downstream from the shroud sleeve, the spring seat comprising:
a first flow outlet of the safety screen assembly;

a screen spool, the screen spool operatively disposed between the flange and the first flow outlet, the screen spool comprising:
a tubular body with an inner passage;
a first screen disposed within the inner passage; and
a bypass passage formed in the tubular body,
wherein the tubular body is in sliding engagement with the shroud sleeve in both a first position and a second position, wherein in the first position the tubular body engages the flange and the shroud sleeve closes the bypass passage from fluid flow, and wherein in the second position the tubular body is moved away from the flange and towards the first flow outlet and the bypass passage is open to fluid flow; and

a spring engaged between the flow inlet and the first flow outlet of the safety screen assembly, the spring biasing the tubular body of the screen spool toward the flange of the shroud sleeve,
wherein the shroud sleeve further comprises a downstream end disposed inside the inner passage of the tubular body of the screen spool, and wherein the tubular body of the screen spool is in sliding engagement over at least a portion of the shroud sleeve and is laterally supported by the shroud sleeve.

2. The assembly of claim 1 , wherein the bypass passage extends radially through the tubular body of the screen spool and is disposed upstream from the first screen.

3. The assembly of claim 2 , wherein the flange extends radially outward relative to a central axis of the safety screen assembly and has an outer diameter greater than a diameter of the inner passage of the tubular body of the screen spool.

4. The assembly of claim 1 , wherein the shroud sleeve further comprises:
at least one resilient locking element disposed at or near a downstream end of the shroud sleeve,
wherein the at least one resilient locking element extends into the tubular body when the tubular body is moved away from the flange and towards the first flow outlet of the spring seat.

5. The assembly of claim 4 , wherein the at least one resilient locking element is a detent that extends axially downstream from the downstream end of the shroud sleeve and is biased radially outward from the downstream end of the shroud sleeve.

6. The assembly of claim 4 , wherein the at least one resilient locking element extends into the bypass passage when the tubular body is moved away from the flange and towards the first flow outlet of the spring seat.

7. The assembly of claim 4 , wherein the screen spool further comprises:
a second screen disposed at the bypass passage.

8. The assembly of claim 7 , wherein the second screen comprises a coarser mesh than the first screen.

9. The assembly of claim 1 , wherein the spring seat further comprises:
a second flow outlet,
wherein the first flow outlet is centered on the central axis of the safety screen assembly and the second flow outlet is disposed radially outward from the first flow outlet.

10. The assembly of claim 9 , wherein the bypass passage fluidically communicates with the second flow outlet when the tubular body is moved away from the flange and towards the first flow outlet of the spring seat.

11. A safety screen assembly suitable for use within a fluid passage, the safety screen assembly comprising:
a shroud sleeve, the shroud sleeve comprising:
an upstream end that defines a flow inlet of the safety screen assembly;

a spring seat disposed downstream from the shroud sleeve, the spring seat comprising:
a flow outlet of the safety screen assembly;

a screen spool, the screen spool operatively disposed between the flow inlet and the flow outlet, the screen spool comprising:
a tubular body with an inner passage;
a screen disposed within the inner passage of the tubular body; and
a plurality of bypass passages formed in the tubular body, wherein the plurality of bypass passages extend axially through the tubular body of the screen spool and the plurality of bypass passages are disposed radially outward from the inner passage and are generally parallel to the inner passage,
wherein the tubular body is in sliding engagement with the shroud sleeve in both a first position and a second position, the shroud sleeve closing the plurality of bypass passages from fluid flow when the tubular body is in the first position, and the plurality of bypass passages being open to fluid flow when the tubular body is in the second position, and
wherein the screen spool is disposed within the shroud sleeve; and

a spring engaged between the screen spool and the spring seat, the spring biasing the tubular body of the screen spool toward the first position,
wherein the shroud sleeve includes a radially inward extending flange disposed at the upstream end of the shroud sleeve that covers an opening of each of the plurality of bypass passages when the tubular body of the screen spool is at the first position.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Carpenter Richard J

Classifications

• B01D29/01 Primary

  with flat filtering elements (B01D29/39 takes precedence) · CPC title

• B01D35/1475

  Pressure relief valves or pressure control valves · CPC title

• B01D35/147

  Bypass or safety valves · CPC title

• B01D27/103

  Bypass or safety valves · CPC title

• B01D35/14 Primary

  Safety devices specially adapted for filtration (preventing or minimising fires or explosions A62C); Devices for indicating clogging (incorporated in a throw-away filter B01D27/10) · CPC title