CZ24453U1 - Ultrasonic probe for flow meters in explosive environment - Google Patents

Description

The technical solution relates to an ultrasonic probe for flow meters into an explosive atmosphere, for measuring the flow or volume of liquids moving in closed pipelines.

BACKGROUND OF THE INVENTION

Each ultrasonic flow meter is based on two or more electroacoustic transducers, called ultrasonic transducers, which generate an acoustic wave from the electrical signal, or transform the acoustic wave back into an electrical signal. The arrangement of the probes varies according to the specific conditions and there are many specific solutions.

Most of these known solutions have one common feature, namely that they are not suitable for explosive atmospheres due to the possibility of a discharge and consequently a spark leak. Sparks may jump due to impact or temperature changes. The spark itself would then cause enormous consequences in an explosive atmosphere.

Until now, ultrasonic probes for explosive atmospheres have been designed in a very complex way, mostly in special cases equipped with the necessary electronic equipment. Solutions of Krone, Siemens and the like are known.

The essence of the technical solution

To a large extent, the ultrasonic probe for explosive flowmeters according to the invention consists of the probe body, the inner part of which is fitted with a piezoceramic crystal on which the stop is placed. The stop, together with the piezoceramic crystal, is placed in the damping insert. The spring support and spring are placed over the stopper as far as the stop. On the spring there is a probe plug with a seal inside the probe, which is fixed in the probe body by a locking ring. On the outside of the probe plug there is a grommet and on the outside of the probe body there is a probe gasket in the sensor housing the probe. The essence of the invention is that in the inside of the probe body, inside the spring, a printed circuit board is placed and attached to the spring support, on which two resistors are placed and connected in parallel, conductively connected on one side on the other hand, with a coaxial cable located in the cable outlet.

The design of the ultrasonic probe for explosion flow meters of the present invention has the advantage that temperature, shock, impact, and the like will not result in hazardous voltage voltages that could cause a spark.

Overview of the drawings

The technical solution will be explained in more detail by means of the drawing, in which in FIG.

Exemplary embodiment

A practical embodiment of an ultrasonic probe for explosion-proof flowmeters according to the invention is shown in the accompanying drawing which illustrates an ultrasonic probe for explosion-proof multi-beam flowmeters from sizes DN 50 to sizes DN 600.

FIG. 1 shows an ultrasonic probe consisting of a body and a probe into which the inner part is mounted

A piezoceramic crystal 3 is placed on the bottom 4. On it there is a stop 6, the Piezoceramic crystal 3 and a stop 6 are placed together in the damping insert 7. On the stop 6 the spring support 8 and spring 4 are placed over the insulating pad 5. the plug 2 of the probe with the seal is placed

- 1 CZ 24453 Ul

Π inside the probe. The probe plug 2 is fixed in the probe body 2 by a retaining ring 13. On the upper side of the probe plug 2, a cable gland 10 is located. On the outside of the probe body 1, the probe seal 12 is placed in the probe. In the inner part of the probe body 1, inside the spring 4, a printed circuit board 9 is located and attached to the spring support 8, on which two parallel resistors 16 are placed, which are conductively connected on one side via conductor 14 to the inner part of the stop 6 and on the other hand with the coaxial cable 15 located in the cable outlet 10.

Piezo-ceramic 3 has two stickers. The bottom adhesive is connected to the probe body 1 through a binding gel, which is grounded. The second label is then connected to the coaxial cable 15 via the stop 6, the conductor 14 and the resistor 16 and led out through the impedance transformer.

There are two resistors 16 in the ultrasonic probe, not because of the function itself, but for the sake of reliability, in the event of failure of one, to ensure reliable operation of the probe, i.e. the impossibility of generating a dangerous magnitude voltage and thus avoiding the possibility of spark.

The printed circuit board 9 is soldered into the spring support 8. The soldering is performed with a soft tube tin solder.

An ultrasonic probe for explosive flow meters according to the invention can be used for both transmission and reception.

Industrial applicability

The ultrasonic probe for explosion-proof flowmeters according to the invention can advantageously be used for any measurement of flow or volume of liquids when measured in potentially explosive atmospheres.

Claims (5)

1. An explosion-proof ultrasonic probe for flowmeters, consisting of a probe body in which a pezoceramic crystal is placed on the bottom, on which a stop is placed, together 25 with a piezoceramic crystal located in the damping insert, with a spring support and a spring on which the probe plug with the probe gasket inside the probe body is located over the insulating pad, retained in the probe body by a retaining ring while the cable gland is located outside and on the outside of the probe body, a probe seal is placed in the sensor in which the probe is located, characterized in that inside the probe body (1), inside the spring 30 (4), a printed circuit board (9) is mounted and attached to the spring support (8), on which two resistors (16) are placed and connected in parallel, conductively connected on one side via a conductor (14) to the inner part of the stop (6). ) and, on the other hand, a coaxial cable (15) located in the cable outlet (10). 35 1 drawing Overview of reference marks: 1 - probe body 2 - probe plug 40 3 - pezoker ceramic crystal 4 - spring 5 - insulating pad CZ 24453 Ul Stop Damping Pad Spring Support PCB - cable gland - seal inside the probe - sealing the probe into the sensor - retaining ring - wire - coaxial cable - resistor.