Heating device for detecting temperature in use of photodetector and protection method thereof

Abstract

The invention relates to a heating device for detecting temperature in use of a photodetector and a protection method thereof. The heating device comprises a shell, a heater, a light guide rod, a light guide element and a photodetector, wherein a flow channel is arranged inside the shell; the heater is arranged inside the flow channel; the light guide rod is provided with a transparent main body, a first end part and a second end part; the second end part is located inside the shell; the light guide element is arranged on the second end part and faces at the heater so as to guide the light, emitted by the heater, to the first end part. The photodetector is arranged on the first end part and faces at the second end part so as to indirectly receive the light which irradiates on the light guide element through a transparent main body. Therefore, the photodetector is used for detecting temperature of the heater and can be used for performing effective overheat protection on the heater due to rapid reaction speed; the photodetector can be prevented from being damaged in an environment with high temperature difference; the spatial arrangement of the heating device is relatively flexible.

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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