Smoke detector

Patent metadata

Field	Value
Publication number	US-11322006-B2
Application number	US-201917252634-A
Country	US
Kind code	B2
Filing date	Oct 23, 2019
Priority date	Nov 20, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A smoke detector includes: a housing; a sensing chamber in the housing, wherein in the sensing chamber, a first light emitter and a first light receiver that are disposed at the periphery of the sensing chamber and facing a middle portion of the sensing chamber are included, a first baffle is included in the sensing chamber, the first baffle is disposed adjacent to the first light emitter and includes a baffle body and a branch portion, the baffle body extends from the periphery of the sensing chamber toward the middle portion, and the branch portion comprises a plurality of sub-baffles branching off the baffle body; and a circuit board electrically connected to the first light emitter and the first light receiver respectively.

First claim

What is claimed is:

1. A smoke detector, comprising:
a housing;
a sensing chamber in the housing, wherein in the sensing chamber, a first light emitter and a first light receiver are disposed at the periphery of the sensing chamber and facing a middle portion of the sensing chamber;
a first baffle in the sensing chamber, the first baffle disposed adjacent to the first light emitter and including a baffle body and a branch portion, the baffle body extending from the periphery of the sensing chamber toward the middle portion, and the branch portion including a plurality of sub-baffles branching off the baffle body;
the first light emitter and the first light receiver arranged at a central angle between 90° and 180°;
a second light emitter disposed in the sensing chamber, the second light emitter located between the first light emitter and the first light receiver and spaced apart from the first light receiver by a central angle of less than 90°, wherein the first baffle is located between the first light emitter and the second light emitter;
a second baffle extending from the periphery of the sensing chamber toward the middle portion and disposed between the second light emitter and the first light receiver, the second baffle extending beyond a distal end of the second light emitter, the second baffle extending beyond a distal end of the first light receiver;
a third baffle disposed at the outer side of the first light receiver, an inner end of the third baffle extending toward the radial direction of the first light receiver; and
a circuit board electrically connected to the first light emitter and the first light receiver respectively.

2. The smoke detector according to claim 1 , wherein some of the sub-baffles extend toward the radial direction of the first light emitter.

3. The smoke detector according to claim 1 , wherein the branch portion is divergent in cross-section.

4. The smoke detector according to claim 1 , wherein the sensing chamber is cylindrical.

5. The smoke detector according to claim 1 , wherein some of the sub-baffles extend toward the radial direction of the first light emitter, and some of the sub-baffles extend toward the radial direction of the second light emitter.

6. The smoke detector according to claim 1 , wherein the sensing chamber comprises an opening, a sidewall and a bottom wall, and the sidewall of the sensing chamber is toothed.

7. The smoke detector according to claim 1 , wherein the sensing chamber is formed by assembling a smoke guiding cover, a labyrinth body and a labyrinth base.

8. The smoke detector according to claim 7 , wherein the first baffle is fixed to the labyrinth base.

9. The smoke detector according to claim 7 , wherein the labyrinth base defines a light emitter holder and a light receiver holder, and the first light emitter and the first light receiver are respectively located in the light emitter holder and the light receiver holder, wherein pins of the first light emitter and the first light receiver are connected to the circuit board after passing through the labyrinth base, and the labyrinth body defines a light emitter cover and a light receiver cover; when the labyrinth body and the labyrinth base are assembled together, the first light emitter is fixed between the light emitter holder and the light emitter cover, and the first light receiver is fixed between the light receiver holder and the light receiver cover.

10. A smoke detector, comprising:
a housing;
a sensing chamber in the housing, wherein in the sensing chamber, a first light emitter and a first light receiver are disposed at the periphery of the sensing chamber and facing a middle portion of the sensing chamber;
a first baffle in the sensing chamber, the first baffle disposed adjacent to the first light emitter and includes a baffle body and a branch portion, the baffle body extending from the periphery of the sensing chamber toward the middle portion, and the branch portion including a plurality of sub-baffles branching off the baffle body;
wherein the first light emitter and the first light receiver are spaced apart by a central angle between 90° and 180°;
a second light receiver disposed in the sensing chamber, the second light receiver located between the first light emitter and the first light receiver and spaced apart from the first light emitter by a central angle of less than 90°, wherein the first baffle is located between the first light emitter and the second light receiver;
a second baffle extending from the periphery of the sensing chamber to the middle portion and disposed between the second light receiver and the first light receiver, the second baffle extending beyond a distal end of the second light receiver, the second baffle extending beyond a distal end of the first light receiver; and
a third baffle at an outer side of the first light receiver, an inner end of the third baffle extending toward the radial direction of the first light receiver.

Assignees

• Carrier Corp

Inventors

• Zu Mingyan
• Yang Zhanlin
• Gao Zhihua

Classifications

• G08B17/113

  Constructional details · CPC title

• G08B29/04

  Monitoring of the detection circuits · CPC title

• G08B29/18 Primary

  Prevention or correction of operating errors (G08B29/02, G08B29/12 take precedence) · CPC title

• G08B17/107 Primary

  for detecting light-scattering due to smoke · CPC title