[Patent Introduction] A Small-Volume High-Temperature Pressure Transmitter
2020-08-26
“A small-volume high-temperature pressure transmitter” is an invention patent—both international and domestic—that has been applied for by Suno-Meng Technology Co., Ltd. (Application No. 2019109513119). This product features a 300℃ high-temperature nanofilm pressure sensor core developed in-house by the company, which has been perfected through a specially designed structural configuration. The product can operate at medium temperatures up to 250℃ (with potential expansion to 350℃), boasts a combined accuracy better than 0.2%FS, and has a length of less than 40 millimeters. Its output signals are either 0.5–4.5 VDC or 4–20 mA DC. This high-performance pressure transmitter is ideally suited for applications in weapon systems such as missile propulsion systems, as well as in various civilian fields.
Background Technology
High-temperature pressure sensors/transmitters have broad application prospects in fields such as petroleum, chemical industry, metallurgy, rubber, construction machinery, aerospace, and weapons systems. In recent years, the development of pressure sensors has been remarkably rapid worldwide, with numerous high-performance pressure sensor products being developed. For example, the U.S. has developed high-performance thin-film pressure sensors whose operating temperature can reach 177°C and whose measurement range can extend up to 140 MPa. In recent years, Japan has also developed high-performance thin-film pressure sensors that boast high overall accuracy and sensitivity, a wide temperature operating range, compact size, excellent long-term stability, and low power consumption. These sensors are now extensively used in oil exploration, aerospace, and weapon systems. Countries such as the United Kingdom and France have also actively launched research on high-performance thin-film pressure sensors.
Invention Overview
The objective of the present invention is to address the issues of large product size and poor stability of pressure sensors/transmitters in high-temperature environments by proposing a compact, high-temperature pressure transmitter that enables stable operation of pressure sensors/transmitters under such harsh conditions.
To achieve the above-mentioned objectives, the present invention adopts the following technical solution:
A compact high-temperature pressure transmitter comprises a nickel-plated copper housing. At the lower end of the nickel-plated copper housing is a metal pressure-tapping nozzle designed for fluid diversion. A metal mounting post is embedded in the upper end of the diversion channel of the metal pressure-tapping nozzle. An insulating ceramic seat is positioned between the metal mounting post and the metal pressure-tapping nozzle. The upper end of the metal mounting post is fitted with a high-temperature-resistant core. Above the high-temperature-resistant core is a ceramic circuit board, and a modified PP support is placed between the high-temperature-resistant core and the ceramic circuit board.
The high-temperature-resistant core is equipped with a liquid chamber inside. An elastomer is positioned at the upper end of the liquid chamber. The liquid chamber is connected to the drainage channel of the metal pressure nozzle via a drainage hole located in the middle of a metal mounting post. The elastomer is electrically connected to a ceramic circuit board, and the output end of the ceramic circuit board is connected to lead wires. A locking connector is mounted on the top of the nickel-plated copper housing, and the lead wires extend out through the slots of the locking connector.
In this invention, the pressure transmitter has a pressure measurement range of 0–100 MPa, an operating medium temperature range of -55℃ to 250℃, an output signal of 0.5–4.5 V or other standard signals, and an accuracy of ≥0.2% FS.
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