Closed type ultrasonic wave water and heat meter

Abstract

The invention discloses a closed type ultrasonic wave water and heat meter. In the water and heat meter, a meter shell (1) is formed to be in the shape of a similar U-tube; a through horizontal pipe is horizontally arranged at the bottom of the U-tube and parallel to a water inlet / outlet pipe; a speed measuring pipe (28) is inserted in the through horizontal pipe; ultrasonic transducer assemblies are mounted on two ends of the through horizontal pipe; a level and electrode assembly is filled in a side through pipe of the through horizontal pipe; one or more groups of semiconductor temperature difference electricity generating pieces (26) are fixed on the outer side of the through horizontal pipe; radiators (27) are adhered onto the semiconductor temperature difference electricity generating pieces; an upper meter shell cover (2) and a lower meter shell cover are used to close a signal measuring basic meter; a control circuit board (13) and a power supply battery (7) are fixed in an electronic seal box (5) with an opening; a trough-shaped seal ring (6) is mounted on the opening edge of the electronic seal box (5); and the control circuit board (13) and the power supply battery (7) are completely sealed in the electronic seal box (5) via a wedge-shaped sided sealing top cap (8) under the stress of a screw.

Description

Technical field: [0001] The invention belongs to tap water measuring instruments and heat energy measuring instruments, in particular to a closed ultrasonic water meter and heat energy meter. Background technique: [0002] At present, water meters and heat meters used in various places generally adopt the method of water flow pushing the impeller to perform mechanical rotation and the method of ultrasonic measurement of water flow velocity. Most water meters use mechanical methods, while heat meters use ultrasonic waves to measure water flow velocity. Due to the wear and tear of rotating parts such as its impeller, the mechanical method has a relatively short service life. The method of ultrasonic measurement of water flow velocity has the advantages of long life and so on. [0003] At present, the methods of ultrasonic measurement of water flow velocity used in water meters and heat meters are divided into direct ultrasonic and reflective methods. Since the reflective met...

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Problems solved by technology

[0004] At present, most of the water meters and heat meters made of direct ultrasonic waves are installed with ultrasonic transducers on both sides of the velocity measuring tube, so that the propagation path of ultrasonic waves has a certain angle with the flow path of water. The ultrasonic wave is affected by the water flow, and only the component in the same direction as the ultrasonic wave will have an effect, thereby reducing the amplitude of the ultrasonic wave being affected by the water flow, that is to say, this method reduces the accuracy and sensitivity of the ultrasonic wave to measure the water flow velocity

[0005] In addition, most of the current ultrasonic water meters and heat meters use the same caliber of the water velocity measuring tube as the meter, so that the flow velocity of water in the water flow velocity measuring tube cannot be improved, which also reduces the measurement accuracy of the water flow velocity. and one reason for the sensitivity

At the same time, since most of the water flow measuring tubes are made of metal materials, the surface is relatively rough, which also has a certain influence on the uniformity of water flow.

[0006] What's more, at present, most of the transducer fixing sleeves made of metal or plastic are used to fix and seal the ultrasonic piezoelectric ceramic sheet, and these transducer fixing sleeves cannot effectively prevent scale formation on the surface and rust scale in the water. , so the surface of the transducer is easy to scale and lose the function of transmitting and receiving ultrasonic waves normally

[0007] The other is that most of the current ultrasonic water meters and heat meters are connected to the ultrasonic transducer and the signal line of the temperature sensor are exposed outside the watch case, so it is easy to be damaged artificially or accidentally, making it lose its normal measurement function

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