A method of manufacturing a sensor critical level conductive materials

 

The invention relates to the field of measurement technology, in particular to the manufacture of devices level control of conductive liquid and bulk materials. A method of manufacturing a sensor includes the manufacture of the insulator that separates the touch of the inner and outer electrodes, the Assembly of electrodes and insulator. The electrodes on the mating surfaces perform helical grooves. Carry out the pressing reinforced by electrode site with simultaneous registration between the electrodes insulator with screw grooves on the mating surfaces. The insulator is carried out by feeding molding plastic into the cavity which is formed by the mating surfaces of the electrodes. The technical result consists in reducing the complexity of the manufacturing process of the sensor and its value. 3 C.p. f-crystals, 3 ill.

The invention relates to the field of measurement technology, in particular to the manufacture of devices of control of the level of conductive filler (liquid and granular) materials.

A known method of manufacturing a sensor, comprising the manufacture of the insulator separating the outer and inner electrodes, the Assembly of electrodes and insulator [1].

The disadvantage is significant complexity, svappavaara surfaces.

The present invention is the task of reducing the complexity of the manufacturing process of the sensor and its value.

This task is solved in that the insulator separating the electrodes are made of molded plastic, for example Teflon.

This task is solved in that the outer and inner electrodes on the mating surfaces perform helical grooves.

This task is solved in that the manufacture is carried out by pressing of the host glass electrodes with simultaneous registration between the electrodes insulator with screw grooves on the mating surfaces by filing a molded plastic into the cavity which is formed by the mating surfaces of the electrodes.

The technical result, which can be obtained by carrying out the invention, is that the proposed method allows to exclude the operation for the manufacture of the insulator, since the insulator made in the pressing process of molding plastics; manufacture cheap electrodes simple design with low requirements for precision and roughness on the machines, because it eliminates the need for Assembly of electrodes and insulator at the exact press p the fishpond molded plastic by jamming of the screw grooves of the electrodes and insulator.

In Fig. 1 shows the design of the sensor, manufactured by the proposed method.

In Fig.2 and 3 shows a fragment of the helical grooves of the mating surfaces of the electrode 2 and the insulator 3 (similar to electrode 1 and the insulator 3).

Fig.2 - prior to sealing, Fig.3 - after sealing.

In Fig.1 by the letters a and B shows the mating surfaces of the electrodes: A - mating (inner) surface of the outer electrode; B - mating (external) surface of the inner electrode.

The method is as follows.

On the inner surface of the outer electrode 1 and the outer surface of the internal electrode 2 perform helical grooves so that in the process of pressing the mating surfaces a and B of the electrodes 1 and 2 have opposite helical grooves. The internal electrode 2 is placed within the outer electrode 1, thereby obtaining the node, reinforced by the electrodes 1 and 2, with the mating surfaces a and B form a cavity for the registration of the insulator 3 between the electrodes 1 and 2. In the cavity of a molding plastic serves in the process of pressing the reinforced node with simultaneous registration of the insulator. Surfaces a and B provide the fulfillment of the helical grooves on the mating on the secure counter rotation of the electrodes by jamming of the insulator with the outer and inner electrodes.

Information source 1. G. N. Beaver, A. G. Katkov. Methods of level measurement. - M.,1977.

Claims

1. A method of manufacturing a sensor critical level of conductive materials, including the manufacture of the insulator that separates the touch outer and inner electrodes, the Assembly of electrodes and insulator, characterized in that the electrodes on the mating surfaces perform helical grooves, carry out the pressing reinforced by electrode site with simultaneous registration between the electrodes insulator with screw grooves on the mating surfaces by filing a molded plastic into the cavity which is formed by the mating surfaces of the electrodes.

2. The method according to p. 1, characterized in that the electrodes on the mating surfaces perform opposite helical grooves.

3. The method according to p. 1, characterized in that the insulator is made of a molded plastic, such as PTFE.

4. The method according to p. 1, characterized in that the sealing of the sensor provide counter rotation of the electrodes by jamming insulator to the electrode.

 

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SUBSTANCE: method can be used for measuring level of liquid and loose materials as well as for measuring distances. Difference frequency spectrum is calculated and its shape is compared with shape of reference spectrum. Reference spectrum consists of permanent and variable parts which are achieved during calibration at working place. Parameters of permanent part of reference spectrum are defined by design of reservoir and kept permanent during process of measurement. Parameters of variable part of reference spectrum are subject to change till achieving minimum of difference measure for measured and reference spectra and are used for calculating distances. Reference spectrum can be formed by means of two ways. According to the first way reference spectrum is calculated from formed reference signal which has to be the sum of partial signals with parameters corresponding to reflections from members of constructions and from measured signal level. Parameters of signals that correspond to reflection from measured level are changed when conducting measurements till achieving minimum of difference measure. According to the second way during process of calibration the permanent and variable parts of spectrum of measured signal are memorized and the measured signal is used as a reference one. Value of measured frequency is the frequency at which difference measure is minimal. For both variants of forming reference spectrum the permanent and variable parts of reference spectrum do not come into interaction.

EFFECT: improved precision of measurement at the presence of background.

8 cl, 4 dwg

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