Heating device using photodetector to detect temperature and protection method thereof

Abstract

The invention relates to a heating device using a photodetector to detect temperature and its protection method. The heating device includes a casing with a flow channel inside, a heater arranged in the flow channel, a light guide rod, a light guide element and a light detector. The light guide rod has a transparent body, a first end and a second end located inside the casing, the light guide element is located at the second end and faces the heater, so as to direct the light emitted by the heater to the direction of the first end guide. The light detector is located at the first end and faces the second end, so as to indirectly receive the light irradiated by the heater on the light guide element through the transparent body. Therefore, the photodetector can be used to detect the temperature of the heater, and the heater can be effectively protected from overheating due to its fast response speed, and the photodetector can avoid the problem of being easily damaged due to the high temperature difference environment , and the heating device is quite flexible in spatial configuration.

Description

technical field [0001] The present invention relates to a heating device, in particular to a heating device using a photodetector to detect temperature and a protection method thereof. Background technique [0002] The conventional heating device mainly includes a housing with a flow channel inside, and a heater arranged in the flow channel, which is used for fluid (usually air) to enter from an inlet of the housing and pass through the flow channel. It is discharged from an outlet of the casing, and when the fluid passes through the heater, the temperature of the fluid is increased due to taking away the heat from the heater, so the heating device can heat the object located outside the outlet by discharging the high-temperature fluid. [0003] There is usually a temperature sensor outside the outlet of the heating device, such as thermocouple (thermocouple), bimetal thermostat (bimetal thermostat), etc., the temperature sensor is used to sense the temperature of the fluid ...

AI Technical Summary

Problems solved by technology

However, in order to avoid the problem that the photodetector is easily damaged in a high temperature difference environment, in conventional applications, the photodetector is not arranged around the light source but receives light through a light guide element (such as a lens, a quartz tube, etc.), In order to allow the light emitted by the light source to be transmitted to the photodetector, the photodetector is opposite to the light source through the light guide element. Such a design is difficult to arrange in space in a small-sized device, so it is difficult to apply to the heating device.

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