Oil cup liquid level measuring device for range hoods

Abstract

The invention discloses an oil cup liquid level measuring device for range hoods. The device is characterized in that the device includes an ultrasound transmitting tube, a digital-to-analog converter, an ultrasound receiving tube, an analog-to-digital converter and a master control chip; an ultrasound excitation signal generated by the digital-to-analog converter meets the following conditions which are shown in the description; the ultrasound excitation signal has phase jump at the time of t = NT; and the master control chip controls the analog-to-digital converter to start at the time of t= NT and performs sampling processing on an ultrasound reflection signal. The advantages of the device are as follows: the brand-new ultrasound excitation signal can be designed by adopting the mode of phase jump; a mutation signal can be received by an ultrasound receiving end, so that the detection of the signal of the receiving end can be simpler and more accurate; and under the premise of guaranteeing detection precision, the service life of the detecting device can be effectively prolonged, and the whole performance of products can be enhanced.

Description

technical field [0001] The invention relates to a liquid level measuring device, in particular to an oil cup liquid level measuring device of a range hood. Background technique [0002] The oil generated during the use of the range hood will be discharged into the oil cup. Usually, the oil level in the oil cup needs to be manually observed and detected. When it accumulates to a certain level, it needs to be poured out in time to prevent overflow. . In order to facilitate the observation of the liquid level of the oil cup, most of the traditional range hood oil cups are made of transparent plastic, but the plastic oil cup has the problems of low strength and easy aging; there are also metal oil cups, although the strength is high, but the It is not convenient to observe the liquid level of the oil cup. Even if there is an observation window, the oil stain will adhere to the observation window after long-term use, which will cause the user to be unable to see the liquid level...

AI Technical Summary

Problems solved by technology

In order to facilitate the observation of the liquid level of the oil cup, most of the traditional range hood oil cups are made of transparent plastic, but the plastic oil cup has the problems of low strength and easy aging; there are also metal oil cups, although the strength is high, but the It is not convenient to observe the liquid level of the oil cup. Even if there is an observation window, the oil stain will adhere to the observation window after long-term use, which will cause the user to be unable to see the liquid level of the oil cup.

[0003] In view of the above problems, various devices for automatic detection of oil cup liquid level have appeared in the prior art, such as the existing Chinese invention patent "A Device for Detection of Oil Cup Oil Level of Range Hood" with the patent number ZL201310653491.5 By detecting the heating type thermistor on the circuit, the oil in the oil cup is heated and the temperature of the oil is detected, and then the height of the oil is obtained through analysis. However, this contact detection method will make the electronic components The service life in the environment is greatly reduced, thereby reducing the detection accuracy and affecting the detection accuracy; another example is the Chinese invention application "Cooker Hood Oil Cup Warning Oil Level Forecasting Device" with application number 201510386967.2, which discloses such an oil level detection device. This device detects the warning liquid level of the oil cup through the floating body placed in the oil cup and other equipment, but the disadvantage of this device is that the floating body soaked in oil for a long time will reduce the service life and the detection accuracy is not high

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