Water temperature and water level measuring device for solar water heater

Abstract

The invention relates to a water temperature and water level measuring device, in particular to a water temperature and water level measuring device for a solar water heater. The device comprises a temperature sensor, a water level probe, a force transfer part, a rotating shaft, a signal processor, a water temperature and water level control panel, a lead and a shell, wherein the force transfer part extends into the water tank of the solar water heater from an exhaust pipe, and one end of the force transfer part is inserted into the water level probe and is hermetically connected with the topof the water level probe, and the other end of the force transfer part is connected with the signal processor. The rotating shaft is fixed on the shell after vertically penetrating the force transferpart. The water level probe is in a cylindrical structure, and one end of the water level probe is connected with the force transfer part, and the other end of the water level probe is soaked into water in the water tank of the solar water heater; and the temperature sensor is arranged in the water level probe. In the invention, the measured numerical value is not influenced by water quality and has high accuracy; the water level measured value is not limited by the set electrode number, is continuous and is convenient for use and control; electrical elements are isolated from the water so that the phenomenon of scaling cannot happen; and the service life of the product is long.

Description

technical field [0001] The invention relates to a water temperature and water level measuring device, in particular to a water temperature and water level measuring device for a solar water heater. Background technique [0002] At present, the water temperature and water level measuring devices used for solar water heaters on the market can be roughly divided into two categories: capacitive and resistive. [0003] The capacitive water level sensor is made according to the principle of capacitance. The capacitance is composed of two polar plates and a medium. Changing the medium will change the capacitance. Water is the medium of the capacitance. Linear change, the water level in the water tank can be detected by detecting the capacitance. However, because the capacitance change is very small, usually only about 100P, and the environment is harsh, the accuracy and stability of the measurement are difficult to control. And there are following defects. 1. Affected directly ...

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Problems solved by technology

1. Affected directly by the assembly process, the consistency of the structural capacitance is very poor. It is necessary to randomly pre-set the capacitance values ​​of the zero water level and the full water point. However, due to the different humidity of the sensor during measurement and the different on-site environments, the predetermined value It is difficult to guarantee the accuracy of the next time

2. The temperature characteristics of the capacitive water level sensor are relatively poor. During use, it is affected by the temperature of the medium and the environment, and the size of its structural capacitance also changes accordingly.

3. After using for a period of time, affected by the high-temperature steam in the solar water heater tank, the initial value of the structural capacitance of the sensor will become larger and larger after the tide changes as a whole

Due to the high temperature and high humidity in the water tank, the electrodes are easily scaled, which affects the service life. At the same time, due to the different water quality and conductivity in different parts of the country, these two reasons directly affect the accuracy of resistance measurement and eventually lead to sensor failure.

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