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Fire alarm sensor

A sensor and fire alarm technology, applied to fire alarms, alarms, fire alarms with electrical effects, etc., can solve the problems of reduced detection sensitivity, hot air flow cannot be introduced by fins 105, long time lag in temperature rise, etc., to achieve The effect of sensitivity enhancement

Inactive Publication Date: 2004-04-28
HOCHIKI CORP
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AI Technical Summary

Problems solved by technology

[0005] Although the fire alarm sensor in the prior art has an outer cover 104 to protect the heat detection element 103, the hot air flow cannot be effectively introduced and gathered around the heat detection element 103 by the fins 105 placed towards the center of the outer cover.
Based on this, when the housing 104 is exposed to the hot air flow, the time lag of the temperature rise of the heat detection element 103 becomes very long, and there arises a problem that the detection sensitivity is lowered.

Method used

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Embodiment Construction

[0038] The preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] Referring now to FIG. 1, there is depicted a fire sensor constructed in accordance with a first embodiment of the present invention. The fire alarm sensor 1 of the first embodiment includes a heat detecting element 3 protruding from the center of the lower portion of a sensor main body 2 which is installed on a ceiling or the like. The heat detecting element 3 is composed of a thermistor. In addition to the thermistor, the heat detection element 3 can be composed of temperature detection elements, such as transistors, diodes, thermocouples and the like.

[0040] The heat detection element 3 is provided with a protective cover 4 . The housing 4 has several fins 5 which are placed on a support plate 7 on the side of the sensor body 2 to surround the heat detecting element 3 . In the first embodiment, six fins 5 are configured to pr...

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Abstract

A fire sensor comprising a heat detection element for detecting heat from a hot airflow generated by a fire, a sensor main body, and an outer cover, which has a plurality of plate fins protruding from the sensor main body, for protecting the heat detecting element. The plate fins have a predetermined offset angle to a center line passing through the center of the outer cover and are erected approximately perpendicular to the sensor main body.

Description

technical field [0001] The present invention relates to a fire alarm sensor, and more particularly to a fire alarm sensor with an outer cover for protecting a heat detecting element which detects the heat dissipated by a hot air flow generated by a fire. Background technique [0002] As a device for detecting high temperature or temperature rise rate caused by fire and issuing an alarm, there is a fire alarm sensor using a heat detection element such as a thermistor (Japanese Patent Laid-Open Nos. HEI9-259376 and HEI10-188163). [0003] As shown in FIG. 14, a fire alarm sensor 101 of the prior art is shown. The fire alarm sensor 101 includes a sensor body 102 , a heat detection element 103 disposed on the sensor body 102 for detecting the heat emitted by hot air flow generated by fire, and an outer cover 104 for protecting the heat detection element 103 . [0004] As shown in FIG. 15 , the outer cover 104 has several fins 105 for preventing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/06
CPCG08B17/06
Inventor 黛佳里山内幸雄岛裕史
Owner HOCHIKI CORP
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