High-temperature-resistant liquid ultrasonic transducer

Abstract

The invention relates to a high-temperature-resistant liquid ultrasonic transducer which comprises an ultrasonic transducer body located in a protective sleeve, and the transducer body comprises a bearing shaft and a transducer shell which are connected through a compression bolt; an insulating block, a positive electrode block, a piezoelectric ceramic piece and a negative electrode piece are coaxially arranged in the transducer shell, the diameter of the positive electrode block is not smaller than that of the insulating block, the diameter of the negative electrode piece is not smaller than that of the piezoelectric ceramic piece, the end face edge of the positive electrode block is connected with a positive lead, and the end face edge of the negative electrode piece is connected with a negative lead. The transducer body is arranged in the protective sleeve for delaying temperature rise, and the diameter difference between the negative electrode plate and the piezoelectric ceramic piece and the diameter difference between the positive electrode block and the insulating block are matched, so that on one hand, transducer lead welding is facilitated, and smooth contact of parts in the transducer is prevented from being damaged due to improper welding; on the other hand, extra temperature rise caused by the lead clinging to the transducer shell is avoided.

Description

technical field [0001] The invention relates to the field of flow monitoring instruments, in particular to a high temperature resistant liquid ultrasonic transducer. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The ultrasonic transducer is the core component of the ultrasonic flowmeter, through the piezoelectric effect of the piezoelectric ceramic sheet, the mechanical energy and the electrical energy are mutually converted to realize the transmission and reception of ultrasonic signals. [0004] For liquid ultrasonic transducers suitable for ultrasonic flowmeters, piezoelectric ceramic sheets are generally added with a matching layer, and then potted with epoxy resin, which can be applied to normal temperature ultrasonic flowmeters and ultrasonic heat meters with operating temperatures below 150°C If the temperature is too high, the e...

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Problems solved by technology

[0004] For liquid ultrasonic transducers suitable for ultrasonic flowmeters, piezoelectric ceramic sheets are generally added with a matching layer, and then potted with epoxy resin, which can be applied to normal temperature ultrasonic flowmeters and ultrasonic heat meters with operating temperatures below 150°C If the temperature is too high, the epoxy resin will melt, and when the temperature exceeds the Curie point temperature of the piezoelectric ceramic, the piezoelectric effect of the piezoelectric ceramic will fail; and the chemical industry, thermal power and other industries have a working environment with a temperature higher than 200°C. However, the epoxy resin in the existing liquid ultrasonic transducer and the outer casing have shown signs of melting and cannot be used

[0005] However, if the material of the piezoelectric ceramic is unilaterally changed to make it able to withstand high temperature environment, its internal structure does not support it to withstand high temperature environment, and the lead wires and other components in the shell lack structural support and will still be affected by high temperature.

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