Detector utilizing an adjustment screw and a bellows

Patent metadata

Field	Value
Publication number	US-9970837-B2
Application number	US-201514755321-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Jun 30, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A detector that detects an alarm and/or fault condition with respect to a pressure of a medium is provided. The detector comprises a housing comprising an access tube configured to receive a medium and a bellows fixed to the housing comprising a cavity and a first contact surface. The detector also comprises an adjustment screw positioned within the cavity of the bellows, coupled to the housing via an insulation member, and comprising a second contact surface. The detector is further configured to detect a change in pressure of the medium based on whether the first contact surface and the first contact surface are in electrical communication.

First claim

The invention claimed is:

1. A detector, comprising:
a housing comprising an access tube configured to receive a medium;
a bellows fixed to the housing comprising a cavity and a first contact surface;
an adjustment screw positioned within the cavity of the bellows, coupled to the housing via an insulation member, and comprising a second contact surface,
wherein the detector is configured to detect a change in pressure of the medium based on whether the first contact surface and the second contact surface are in electrical communication,
wherein the bellows is configured to compress when the change in pressure is an increase in pressure of the medium,
wherein the detector is:
an alarm detector configured to trigger when the first contact surface and the second contact surface are in electrical communication, or
a fault detector configured to trigger when the first contact surface and the second contact surface are not in electrical communication.

2. The detector of claim 1 , wherein the bellows is configured to expand when the change in pressure is a decrease in pressure of the medium.

3. The detector of claim 1 , wherein a depth of penetration of the adjustment screw within the cavity is configured to be adjusted by rotating the adjustment screw.

4. The detector of claim 1 , wherein the bellows is a first bellows of a plurality of bellows in the housing,
wherein the first bellows is configured to compress when the change in pressure is an increase in pressure of the medium, and
wherein the second bellows is configured to expand when the change in pressure is a decrease in pressure of the medium.

5. The detector of claim 4 , wherein the first and second bellows are welded in a stack.

6. The detector of claim 4 , comprising:
a threaded tube positioned within the cavity between the bellows and the adjustment screw, coupled to the housing via an insulation member, and comprising a third contact surface.

7. The detector of claim 6 , wherein a depth of penetration of the threaded tube within the cavity is configured to be adjusted by rotating the threaded tube.

8. A dual pressure detector, comprising:
an access tube configured to receive and supply a medium to the dual pressure detector;
a bellows comprising a cavity and a first contact surface;
an adjustment screw positioned within the cavity of the bellows and comprising a second contact surface,
wherein the dual pressure detector is configured to detect a change in pressure of the medium based on whether the first contact surface and the second contact surface are in electrical communication,
wherein the dual pressure detector is:
an alarm detector configured to trigger when the first contact surface and the second contact surface are in electrical communication, or
a fault detector configured to trigger when the first contact surface and the second contact surface are not in electrical communication.

9. The dual pressure detector of claim 8 , comprising:
a second bellows comprising a second cavity and a third contact surface;
a second adjustment screw positioned within the second cavity of the second bellows and comprising a fourth contact surface,
wherein the dual pressure detector is configured to detect a second change in pressure of the medium based on whether the third contact surface and the fourth contact surface are in electrical communication.

10. The dual pressure detector of claim 9 , comprising:
a housing coupled to the access tube to receive the medium;
wherein the first and second bellows are within the housing.

11. The dual pressure detector of claim 9 , comprising:
first and second housing coupled to the access tube to receive the medium;
wherein the first and second bellows are respectively within the first and second housing.

Assignees

• Kidde Tech Inc

Inventors

• Frasure David
• Wallace Steven

Classifications

• H01H35/245 Primary

  actuated by the deformation of a body of elastic material · CPC title

• G01L13/02

  using elastically-deformable members or pistons as sensing elements · CPC title

• G01L7/06

  of the bellows type · CPC title

• G01L19/0038

  being part of the housing (other details about the housing G01L19/14) · CPC title

• H01H35/2657

  with different switches operated at substantially different pressures · CPC title