Smoke detector chamber

Patent metadata

Field	Value
Publication number	US-9685058-B2
Application number	US-201514921307-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	May 15, 2015
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Various embodiments of a smoke chamber for a smoke detector are presented. Such a smoke chamber may include a housing, having a first portion and a second portion. The first portion may be through which an electromagnetic sensor and two or more electromagnetic emitters interact with an airspace within the housing. The second portion may have an airflow surface that at least partially defines a curved airflow path between the airspace within the housing and an external environment. The curved airflow path may curve radially outward.

First claim

What is claimed is:

1. A smoke chamber for a smoke detector, the smoke chamber comprising:
a housing, wherein an electromagnetic emitter emits electromagnetic radiation into the housing and an electromagnetic sensor senses electromagnetic radiation within the housing; and
a dust collector positioned below a center point of where the emitted electromagnetic radiation intersects a field of view of the electromagnetic sensor within the housing, wherein:
the dust collector is a recessed portion of the housing extending away from the center point;
the housing further comprises an airflow surface that defines an airflow path that curves radially outward from a center of the housing; and
a portion of the housing that comprises the airflow surface and the dust collector is formed from a single piece of material.

2. The smoke chamber for the smoke detector of claim 1 , wherein the housing is comprised of two portions that couple together.

3. The smoke chamber for the smoke detector of claim 2 , the smoke chamber further comprising a rotational alignment extrusion attached to a portion of the two portions, wherein the rotational alignment extrusion permits the two portions to couple together with only a particular rotational alignment.

4. The smoke chamber for the smoke detector of claim 1 , further comprising a plurality of radially-aligned airflow fins located on a second airflow surface of the housing, the airflow surface permitting air to exchange between an interior of the housing and an exterior of the housing.

5. The smoke chamber for the smoke detector of claim 4 , wherein the airflow surface defines an airflow path that has a 3 mm minimum width between the interior of the housing and the exterior of the housing.

6. The smoke chamber for the smoke detector of claim 1 , wherein the housing of smoke chamber is circular.

7. The smoke chamber for the smoke detector of claim 1 , wherein the housing has a plurality of openings for a plurality of electromagnetic emitters to emit electromagnetic radiation toward the center point within the housing.

8. The smoke chamber for the smoke detector of claim 1 , wherein a second airflow surface is stepped and at least partially defines the curved airflow path that curves radially outward from the center of the housing.

9. The smoke chamber for the smoke detector of claim 1 , wherein the dust collector is located below a field of view of the electromagnetic sensor.

10. The smoke chamber for the smoke detector of claim 9 , wherein the dust collector is pentagonal in shape and comprises a first side perpendicular to a first emitter channel of the housing, a second side perpendicular to a second emitter channel of the housing, and a third side perpendicular to a sensor channel of the housing.

11. The smoke chamber for the smoke detector of claim 1 , wherein the smoke chamber further comprises a metallic mesh that encircles the housing, the metallic mesh having a plurality of openings to permit air to pass through the metallic mesh.

12. The smoke chamber for the smoke detector of claim 11 , wherein a metallic cap is connected with the metallic mesh, the metallic cap capping the housing.

13. The smoke chamber for the smoke detector of claim 1 , wherein the housing has a first opening for the electromagnetic emitter and a second opening for the electromagnetic sensor that provides between a 35 degree and a 45 degree offset angle to be present.

14. A smoke detector comprising:
a processor;
a speaker;
a battery compartment;
an electromagnetic emitter;
an electromagnetic sensor; and
a smoke chamber, comprising:
a smoke chamber housing, wherein the electromagnetic emitter emits electromagnetic radiation into the smoke chamber housing and the electromagnetic sensor senses electromagnetic radiation within the smoke chamber housing; and
a dust collector positioned below a center point of where the emitted electromagnetic radiation intersects a field of view of the electromagnetic sensor within the housing, wherein:
the dust collector is a recessed portion of the smoke chamber housing extending away from the center point;
the housing further comprises an airflow surface that defines an airflow path that curves outward from a center of the housing; and
a portion of the housing that comprises the airflow surface and the dust collector is formed from a single piece of material.

15. The smoke detector of claim 14 , wherein the smoke chamber housing of the smoke chamber is comprised of two portions that couple together and the smoke chamber further comprises a rotational alignment extrusion, wherein the rotational alignment extrusion permits the two portions to couple together with a particular rotational alignment.

16. The smoke detector of claim 14 , wherein the smoke chamber further comprises a plurality of radially-aligned airflow fins located on a second airflow surface of the smoke chamber housing, the airflow surface permitting air to exchange between an interior of the smoke chamber housing and an exterior of the smoke chamber housing.

17. The smoke detector of claim 14 , wherein a stepped airflow surface of the smoke chamber housing at least partially defines the airflow path that curves outward from a center of the smoke chamber housing.

18. The smoke detector of claim 14 , wherein the dust collector is located below a field of view of the electromagnetic sensor.

19. The smoke detector of claim 14 , wherein the dust collector is pentagonal in shape and comprises a first side perpendicular to a first emitter channel of the housing, a second side perpendicular to a second emitter channel of the housing, and a third side perpendicular to a sensor channel of the housing.

20. The smoke detector of claim 14 , wherein the smoke chamber housing has a first opening for the electromagnetic emitter and a second opening for the electromagnetic sensor that causes between a 35 degree and a 45 degree offset angle to be present between an alignment of the electromagnetic sensor and an alignment of the electromagnetic emitter.

Assignees

• Google Inc

Inventors

• Schmidt Mathias
• Mittleman Adam
• Gupta Anurag
• Kraz Mark
• Webb Nicholas

Classifications

• G08B21/14

  Toxic gas alarms (G08B21/16 takes precedence) · CPC title

• G08B17/107

  for detecting light-scattering due to smoke · CPC title

• G08B29/185

  Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system · CPC title

• G08B17/113 Primary

  Constructional details · CPC title