Description of the Invention The invention pertains to tap water meters and thermal energy meters, in particular to a closed type ultrasonic water meter and thermal energy meter.
BACKGROUND OF THE INVENTION At present, water meters and heat energy meters used in various places generally use a method in which a water flow drives an impeller to perform mechanical rotation and an ultrasonic wave to measure a water flow velocity. Water meters are more mechanical, while thermal energy meters use ultrasonic waves to measure water velocity. Because of mechanical problems, such as the wear of impellers and other rotating parts, the service life is short, and the ultrasonic measurement of water flow speed has the advantage of long life.
At present, most of the water meters and heat energy meters made by using direct ultrasonic waves are equipped with ultrasonic transducers installed on both sides of the velocity measuring tube, so that the ultrasonic wave propagation path has a certain angle with respect to the flow path of the water. The influence of the water flow will only have the effect of the same component as the ultrasonic wave propagation direction, which reduces the accuracy and sensitivity of the ultrasonic flow velocity measurement.
In addition, the current ultrasonic water meter and heat energy meter, the majority of the use of the flow velocity tube diameter and the nominal diameter of the watch is basically the same, so that the water velocity in the flow velocity tube can not be improved, but also reduce the accuracy of the flow velocity measurement One of the reasons for sensitivity. At the same time, most of the flow velocity tubes are made of metal materials and the surface is rough, which also has a certain influence on the uniformity of water flow.
On the other hand, most current water meters and heat energy meters use transducer holders made of metal or plastic to fix and seal ultrasonic piezoelectric ceramics, and these transducer holders cannot effectively prevent scale and aggregation on the surface. Rust in the water, so the transducer surface is very easy to foul and lose normal transmission and receive ultrasound. In addition, most ultrasonic water meters and heat energy meters that are connected to the ultrasonic transducer and the temperature sensor are exposed outside the case, so that they can easily be destroyed by humans or accidentally, causing them to lose their normal measurement function.
Summary of the Invention
The invention provides a solution which can improve the metering accuracy and the sensitivity of the water meter and the thermal energy meter made by using an ultrasonic wave, and the outer surface of the transducer does not generate the scale and accumulate the rust, and simultaneously connects the ultrasonic transducer. The signal line of the device and the temperature sensor is enclosed in the case cover so that the signal line is not damaged artificially or accidentally without damaging the case cover.
In the invention, the watch case is made into a U-tube shape, and an inlet and outlet pipe is horizontally formed at the top of the U-shaped pipe, and a transverse pipe is formed in the direction of the bottom of the U-shaped pipe transverse to the inlet and outlet pipes, and the U-shaped pipe is formed in the U shape. A velocity measuring tube is inserted into the through-tube of the tube, which can greatly increase the propagation time difference of ultrasonic waves measured by the ultrasonic water meter and the heat energy meter, thereby greatly improving the measurement accuracy and the sensitivity thereof.
In the present invention, the transducer holder of the ultrasonic transducer assembly is made of a polytetrafluoroethylene material, mainly to prevent scale and gather rust on it, because the material of PTFE is very delicate. It will not accumulate scale and rust, so that the normal service life of the water meters and heat meters it makes will be greatly extended.
FZG /YZG Square/Round Vacuum Drying Machine
Description:
Vacuum drying refers to dry the materials under vacuum condition, and use vacuum pump to extract air and wet, thus accelerating drying rate. YZG round vacuum dryer and FZG square vacuum dryer belong to static Vacuum Drying Machine. Under vacuum conditions, the boiling point of material solvent is reduced, making this machine to dry unstable or thermosensitive materials. Additionally, the vacuum dryers have excellent sealing ability, so they are also used for drying the materials requiring solvent recovery or materials with poisonous gas.
Application:
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Features:
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