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Pressure transmitter used for strong acid medium

A transmitter and pressure technology, applied in the field of sensors, can solve the problems of easy detachment of the tetrafluoride spray coating, short service life, easy corrosion of the pressure transmitter, etc., and achieve the effect of long service life, not easy to fall off, and good acid resistance.

Inactive Publication Date: 2018-02-16
NANJING LVZHICHENG PATENT TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Pressure transmitters are very common in chemical production equipment. In the environment of strong acid medium, pressure transmitters are easy to corrode, which affects their service life; Chinese patent: a corrosion-resistant pressure transmitter (application number: 201510720546) published Provided is a corrosion-resistant pressure transmitter, which is characterized in that it includes a metal bottom layer, an anti-corrosion film layer, a metal packaging structure, a pressure-sensitive element, a capillary, and a transmitter, and the outside of the pressure-sensitive element and the capillary is wrapped with a metal packaging structure. The outer side of the metal packaging structure is wrapped with a metal bottom layer, and the method of spraying tetrafluoroethylene is used to spray 1mm on the pressure-sensitive part and the welding part as a whole, so that the entire part in contact with the liquid to be tested is isolated with tetrafluoroethylene to prevent it from being exposed to high temperature conditions. Contact with corrosive liquid under high temperature corrosion to reduce the temperature of the transmitter membrane box and ensure the service life of the product; but the PTFE spray coating is easy to fall off and the service life is not long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of pressure transmitters for strong acid media

[0021] S1. Sandblast the bottom metal surface of the pressure transmitter and ultrasonically clean it with a mixed solution of ethanol and acetone;

[0022] S2. Graphene is deposited on the underlying metal surface treated in step 1 by vapor deposition, and the graphene thickness is 0.1 mm;

[0023] S3. Melt the polyester resin at a high temperature and coat it on the bottom metal surface treated in step 2, bake it at 140 degrees Celsius for 40 minutes, and cool it naturally, wherein the thickness of the polyester resin is 0.4 mm.

[0024] The above-mentioned pressure transmitter has been used normally in strong acid medium for 2 years, the pressure transmitter has not been corroded, the anti-corrosion layer has not fallen off, and all performance indicators are normal.

Embodiment 2

[0026] Preparation of pressure transmitters for strong acid media

[0027] S1. Sandblast the bottom metal surface of the pressure transmitter and ultrasonically clean it with a mixed solution of ethanol and acetone;

[0028] S2. Depositing boron nitride on the bottom metal surface treated in step 1 by vapor phase deposition, the thickness of boron nitride is 0.5mm;

[0029] S3. After melting the polyethersulfone resin at a high temperature, coat it on the bottom metal surface treated in step 2, bake it at 160 degrees Celsius for 20 minutes, and then cool it naturally, wherein the thickness of the polyethersulfone resin is 0.2 mm.

[0030] The above-mentioned pressure transmitter has been used normally in strong acid medium for 2 years, the pressure transmitter has not been corroded, the anti-corrosion layer has not fallen off, and all performance indicators are normal.

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Abstract

The invention belongs to the technical field of sensors, and particularly relates to a pressure transmitter used for a strong acid medium. The pressure transmitter includes an anticorrosion layer which is sprayed on an underlying metal surface of the pressure transmitter; the anticorrosion layer includes a transition layer and a barrier layer; the transition layer material is selected from any oneof graphene and boron nitride; and the barrier layer material is selected from any one of polyester resin and polyether sulfone resin. Under the protection of an anticorrosion film, the pressure transmitter can be used for in chemical equipment under a strong acid medium, the transition layer of the anticorrosion film is tightly combined with the underlying metal surface of the pressure transmitter through a vapor deposition method, and is not easy to fall off, and under double protection of the transition layer and the barrier layer, the pressure transmitter provided by the invention has good acid resistance and a long service life, and can be widely applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a pressure transmitter for strong acid medium. Background technique [0002] A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. It can convert physical pressure parameters such as gas and liquid felt by the load cell sensor into a standard electrical signal for supply Indicator alarm, recorder, regulator and other secondary instruments for measurement, indication and process adjustment; pressure transmitter is the most commonly used sensor in industrial practice, which is widely used in various industrial automatic control environments, involving water conservancy, hydropower, Railway transportation, intelligent building, automatic production control, aerospace, military industry, petrochemical, oil well, electric power, ship, machine tool, pipeline and many other industries. [0003] Press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L19/06
CPCG01L19/0627
Inventor 向巧云
Owner NANJING LVZHICHENG PATENT TECH DEV CO LTD