FIXING UNIT FOR VORTEX AND TEMPERATURE SENSORS IN THE FLOWING PART OF THE VORTEX FLOW METER

摘要

The utility model relates to the structural elements of vortex flowmeters and can be used in measuring equipment to measure the flow of gases or liquid medium. The objective is to simplify the design of the mount while maintaining reliable fixation of the piezoelectric vortex sensor, as well as to ensure the convenience of working with the flowmeter during its repair, calibration and testing . The inventive solution (see drawing) is a partially collapsible design consisting of a boss 1 inserted in the housing 2, rack 3 of the electronic unit, dielectric sensor 4 vortices, temperature sensor 5, metal strip 6 and pin 7. The boss 1 is a hollow cylinder with an internal thread 8 for screwing the rack 3. The boss 1 is rigidly fixed in the through hole 9 of the housing 2, which has the form of a thick-walled pipe. The outer diameter of the boss 1 is commensurate with the corresponding diameter of the hole 9 in the housing 2. The sensor 4 of the vortices is fixed by screwing the stand 3 into the internal thread 8 of the boss 1. The stand 4 is a pipe of small diameter with an external thread 10 from the side of the flow part and two diametrically opposite flats 11 to ensure the necessary torque of the rack 3 into the internal thread 8 of the boss 1. The vortex sensor 4 has the form of a stepped cylinder, in the shoulder 12 of which two through holes 13 are made, sym en- disposed about the axis. One hole 13 'is intended for the output of cables 14 of the temperature sensor 5, the second hole 13' 'is used to position the sensor 4 of the vortices relative to the housing 2 using a pin 7, which is a stepped cylinder installed in the corresponding hole 15 of the housing 2. Seal the interface of the sensor 4 of the vortices with the housing 2 occurs through a metal strip 6 of rectangular cross section, the outer diameter of which is commensurate with the outer diameter of the neck 16 of the vortex sensor 4. To improve heat transfer between the body 2 of the flow part of the flow meter and the temperature sensor 5, thermal grease is used. To seal the internal cavity of the assembly structure, as well as to fix the rack 3 relative to the boss 1 in the threaded connection, a weak anaerobic adhesive-sealant is used, which ensures collapsibility and maintainability of the structure. Performing a vortex sensor with a collar having two through holes symmetrically located relative to the axis, fixing it in the housing from cranking with a pin, in conjunction with the use of a stand of the electronic unit as a retainer when screwing it into the boss close to the top spine shoulder vortex sensor simplifies fitting structure while maintaining a reliable fixation of the piezoelectric vortex sensor and the possibility of installing the temperature sensor in the body and ensure convenience of the flowmeter in its tests, calibration and repair. 1 ill.