Pressure transmitter with waterproof and ventilating membrane

Abstract

The invention discloses a pressure transmitter with a waterproof and ventilating membrane. A circuit board of the transmitter, a sensing core body and the like are arranged in a casing, the front end and the rear end of the casing are connected with a tail assembly and a head assembly, an eccentric cavity is arranged in the end face of the head assembly in the casing, a pipeline in the head assembly is communicated with the bottom of the cavity, the outer part of the head assembly is connected with an air hose connector, an L-shaped ventilating hole is arranged in the head assembly, one end of the ventilating hole is arranged on the lateral wall of the head assembly, the other end of the ventilating hole is arranged on the end face of the head assembly in the casing, a groove is arranged on the periphery of the opening of the ventilating hole, the opening is arranged at the bottom of the groove, a pressing sheet is fixed in the groove, the waterproof and ventilating membrane is fixed on a central hole portion of the pressing sheet, air inside and outside can pass through the L-shaped ventilating hole and the waterproof and ventilating membrane, and impurities of dust, water, oil and the like can be blocked.

Description

technical field [0001] The invention relates to a pressure transmitter. Background technique [0002] The pressure transmitter is to convert the physical pressure parameters such as gas and liquid felt by the pressure measuring element sensor into a standard electrical signal, so as to supply secondary instruments such as indicating alarms, recorders, regulators, etc. for measurement, indication and process adjustment. The general pressure transmitter is mainly composed of three parts: the load cell sensor, the measurement circuit and the process connection. [0003] Gauge pressure transmitters generally include a transmitter housing in which circuit boards, sensors, etc. are installed. Both ends of the housing are connected to the tail assembly and the head assembly, and the tail assembly and the head assembly are connected to other equipment. When working, The air pressure inside the transmitter housing should be consistent with the pressure of the surrounding environment...

AI Technical Summary

Problems solved by technology

[0003] Gauge pressure transmitters generally include a transmitter housing in which circuit boards, sensors, etc. are installed. Both ends of the housing are connected to the tail assembly and the head assembly, and the tail assembly and the head assembly are connected to other equipment. When working, The air pressure inside the transmitter housing should be consistent with the pressure of the surrounding environment, so the inside and outside of the housing should be connected. However, the gas outside the transmitter may contain dust, water, oil and other particulate impurities. These impurities will enter the housing. Damage the circuit boards, sensors, etc. in the housing. The current waterproof, dustproof, and oil-proof measures are mainly to improve the environment where the pressure transmitter is located, and to remove dust and dry the surrounding environment. Such measures cannot fundamentally prevent impurities into the pressure transmitter housing, so it is necessary to design a new type of pressure transmitter that can completely block impurities from entering

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