Today, I will introduce a national invention authorized patent-an input type liquid level transmitter. The patent was applied for by Guangzhou Sennas Instrument Co., Ltd., and the authorization was announced on May 10, 2017.
Content descriptionThe utility model relates to a transmitter, in particular to an input type liquid level transmitter.
Background of the inventionThe liquid level transmitter is based on the principle that the pressure generated by the liquid of different specific gravity at different heights has a linear relationship, and realizes the accurate measurement and transmission of the volume, liquid height and weight of water, oil and paste. Therefore, the liquid level transmitter is often used to install at the bottom of the container to measure the liquid level in the container; this type of installation at the bottom of the container requires a hole at the bottom of the container, which increases a certain amount of work and leaves the overall sealing performance of the container. Under the hidden danger, and in some occasions it is impossible to carry out the bottom installation, such as measuring the depth of well water, measuring the water level of rivers and lakes, and measuring the tidal sea water level. In this type of environment, only the liquid level transmitter can be directly put into the liquid for measurement. The waterproof design of the input liquid level transmitter in the prior art is relatively common, when it is to be poured into a liquid with a certain depth , The deeper the liquid level, the greater the pressure. If the transmitter’s waterproof effect is not good, the liquid will be pressed into the transmitter and the circuit board will be burned out. In the prior art, the atmospheric pressure passes through the air The air duct in the cable introduces the sensor, but the air duct will cause moisture to enter, which will affect the normal operation of the sensor and the circuit board. At the same time, there may be some solid particles in the liquid, and the solid particles will damage the sensitive components. Therefore, it is necessary to do further research on the protection of the input type liquid level transmitter.
Summary of the inventionIn view of the shortcomings of the prior art, the purpose of the present utility model is to provide an input type liquid level transmitter that is more waterproof and moisture-proof.
In order to achieve the above purpose, the present utility model adopts the following technical solutions: an input type liquid level transmitter, including a pipe body, a liquid level detection device and a gas conducting cable installed in the cavity of the pipe body; the rear end of the pipe body A submersible tail joint is installed, an inner hole is arranged inside the submersible tail joint, and the air guiding cable is installed at the inner hole; a seal is arranged between the air guiding cable and the diving tail joint, and the sealing There is a threaded connection between the submersible tail joint and the submersible tail joint; a rubber tube for pressing the air-conducting cable is also arranged between the seal and the submersible tail joint; by tightening the seal, the rubber tube is deformed by squeezing the The rubber tube compresses the air-conducting cable and seals it with the submersible tail joint to form a waterproof structure.
As an optimization of the utility model, the joints between the outer layer of the air guiding cable and the end face of the sealing element are all provided with explosion-proof glue, which plays a waterproof role. The rear end of the submersible tail joint is arranged in a zigzag structure, and the rear end of the submersible tail joint is also equipped with a heat-shrinkable tube containing glue to prevent liquid from entering the tube. The liquid level detection device includes a circuit board, the circuit board and the tube body are fixedly connected with a gap, and the external atmospheric pressure acts on the pressure sensor through the gap reserved by the circuit board to realize the gauge pressure in the current atmospheric pressure environment Measurement; The circuit board and the air-conducting cable are connected by wires to process the detected data. The liquid level detection device further includes a pressure sensor, and the signal communication between the pressure sensor and the circuit board realizes the measurement of the liquid level.
The front end of the pipe body is equipped with a diving joint and a diving protective cap, the diving joint and the diving protective cap are connected by a nut, and the diving joint is provided with a water inlet pipe to effectively prevent the solid particles in the liquid from being sensitive Impact and damage of components. The side of the submersible protective cap is provided with a pressure guiding hole, and the pressure guiding hole is communicated with the water inlet pipe of the submersible joint, and plays a role of buffering and filtering. The submersible joint and the pressure sensor are connected by welding, and the seal plays a waterproof role. A double-sided rubber ring and an insulating sleeve for fixing are arranged between the submersible connector and the circuit board to effectively prevent liquid from entering the inside of the transmitter. It also includes a moisture-proof column fixedly installed at the end of the gas-conducting cable, and a molecular sieve is installed inside the moisture-proof column to prevent moisture from entering the gas-conducting cable.
The beneficial effects of the utility model are: the pipe body of the utility model is equipped with a quadruple waterproof design, and the protection performance is extremely high; at the same time, the pressure sensor is equipped with a diving protective cap at the front end, which effectively prevents the solid particles in the liquid from impacting and damaging the sensitive components. ; A moisture-proof column and molecular sieve are arranged at the end of the air duct to prevent moisture from entering and protect the pressure sensor and circuit board from moisture and damage.
Zhejiang Synmot Electrical Technology Co., Ltd , https://www.synmot-electrical.com