High-precision temperature compensation type pressure sensor

Abstract

The invention relates to the technical field of pressure sensors. The invention further discloses a high-precision temperature compensation type pressure sensor. The sensor includes a base, wherein the upper end of the base is fixedly connected with a gauge outfit; a detection cavity is formed in the lower end of the base; a pressure element pipe is fixedly arranged in the gauge outfit; a liquid storage cavity is formed between the detection cavity and the pressure element pipe in a penetrating mode; a fixing frame is fixedly clamped in the lower end of the detection cavity; a pressure measuring film and a protective film located on the outer side of the pressure measuring film are fixedly connected in the fixing frame in a sealed mode; a fixing annular plate is fixedly connected to the outer side wall of the fixing frame; and a notch used for limiting the fixing annular plate is formed in the lower end of the base. The pressure sensor has the advantages that the problem that the measurement accuracy is influenced by pressure intensity generated by temperature changes in the pressure sensor can be effectively avoided, the protective film can provide effective protection when the temperature rises to cause deformation, and the problem that the measurement accuracy is influenced by the fact that the pressure of the part directly acts on the pressure measuring film is avoided.

Description

technical field [0001] The invention relates to the technical field of pressure sensors, in particular to a high-precision temperature compensation type pressure sensor. Background technique [0002] Diaphragm pressure gauge is suitable for measuring the pressure of corrosive, high viscosity, easy to crystallize, easy to solidify, high temperature liquid, gas or granular solid medium, and it is necessary to avoid the measurement medium directly entering the pressure instrument and prevent the accumulation of sediment and easy Cleaning occasions. Diaphragm pressure gauges are mainly used in petroleum, chemical, chemical fiber, dyeing, pharmaceutical, alkali food and other industrial sectors. [0003] The current pressure sensor system is filled with the pressure measuring fluid as the medium for transmitting pressure, and the pressure measuring fluid is limited by the expansion coefficient characteristics, so that the pressure gauge display value increases with the temperatu...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a high-precision temperature-compensated pressure sensor, which can effectively avoid the problem that the temperature changes in the pressure sensor and the pressure affects the measurement accuracy, and the protective film will be deformed when the temperature rises The advantage of providing effective protection when this part of the pressure is prevented from directly acting on the pressure measuring membrane to affect the measurement accuracy is that the pressure sensor system that is solved is filled with the pressure measuring fluid as the medium for transmitting pressure, and the pressure measuring fluid is affected by the pressure. Due to the limitation of the expansion coefficient, the displayed value of the pressure gauge increases with the increase of the temperature of the pressure receiving part. Especially for the pressure gauge with a low range, the influence is more obvious. Therefore, the measurement accuracy of the pressure sensor is always low due to the influence of temperature, which is extremely large. It affects the measurement accuracy in actual use and is not convenient for people to operate and use

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