SU1408250A1 - Device for mseasuring temperatures of moving object - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the protection against damage while improving the intrinsic safety. When the movement of the magnetic cores 5 and 8, dispersed along the stationary magnthone 9, magn. the flux excited by the magnet (t. changes, which causes the appearance of EMF in the winding 4. It supplies power through the rectifier 2 and the stabilizer 3 at the temperature sensor 1, loading the modulating winding 7, it causes the formation of a mapple flow through the magnetic circuit is 8 and 9, which varies with frequency, the ironorn temperature. This causes a possible electromotive force in the distribution winding 11. In order for the registering ycip- in 13 to receive only a useful signal, a filter 12. 1 sludge is pumped out before the recording device 13 of the VC. Yu

Description

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The invention relates to a measuring technique and can be used in petrochemical industry, especially in the case of powerful piston compressors.

I The purpose of the invention is to increase the interference of 3 ~ the value of improving the conditions for ensuring intrinsic safety. The drawing shows schematically {a device for measuring the temperature of an iodine-E | EZHNOGO object,

I The device contains a frequency temperature sensor, fed through rectifier 2 and stabilizer 3 from the supply winding 4, located on the U-shaped magnet I wire 5 with a permanent magnet 6. The frequency temperature sensor is loaded on the modulating winding 7, located on the P-sfraznogo magnetic core 8. The stationary core magnetic core 9 is covered by movable magnetic circuits separated by an electromagnetic shield 10 of non-magnetic electrically conductive material. Distributed winding 11 is disposed on an immovable rod magnetic core, and installed through filter 12 on the registering device 13.

I The device operates as follows: I When moving mobile magnetic conductors 5 and 8, placed on the object, measure | and, in addition, the fixed magnetic conductor 9 | an impulse flux, excited by a constant hjbiM magnet 6, due to the change of the magnetic o; the resistance of the gap between the movable 5 and the fixed magnetic cores 9 men - e | ts. This causes the appearance of an emf in the .ioTKe 4. This winding supplies power through rectifier 2 and stabilizer 3 to the frequency-temperature sensor 1, which loads the modulating winding 7, and this, in turn, causes a magnetic flux, a passage via a movable 8 and a non-movable 9 magnetic cores and changing with a frequency proportional to temperature. This causes the EMF to occur in the distributed winding 11, in which there is also an EMF arising due to the movement of the moving magnetic circuits 5 and 8. In order for the recording device 13 to receive only a useful signal, i.e. the signal from the frequency sensor of the circuit is switched on in front of the recording device 13 filter 12. Screen 10 serves to separate the flow of the permanent magnet 6 excited and the flow excited by the modulated winding 7.

The thickness of the screen of electrically conductive non-magnetic material can be taken to be equal to or somewhat greater than the depth of penetration of the field and is determined by the equation

0

five

0

five

0

five

0

five

0

yuJjuiS where u) is the circular frequency, s-;

JU.-magnetic permeability. Space of screen material, GN / m;

electrical conductivity of screen material,.

Performing 1 pyrins of poles of a movable U-shaped magnetic circuit with a permanent magnet. Decreasing the corresponding value of the U-shaped magnetic circuit with a modulating winding reduces the influence of pulses created during the movement of a magnet in the measuring winding of a fixed magnetic circuit on a useful signal. The interference signal in this case, besides the difference in frequency from the information one, also differs in phase.

Claims (1)

Invention Formula A device for measuring the temperature of a moving object, containing a frequency temperature sensor connected via a stabilizer to a rectifier, a recorder and a current collector, wired as a core magnetic core with a distributed winding located in the grooves between the annular projections and two U-shaped magnetic circuits made with the possibility displacements along the core of the magnetic core, on one of which, made with cogs in m steps, equal to the cog pitch of the core magnetic circuit, is located modulating a coil connected to the frequency sensor of the temperature sensor, and on another U-shaped magnetic circuit there is a supply winding, one end of which is connected to a rectifier, characterized in that, in order to improve the noise immunity while improving the conditions of spark-freezing, it is equipped a filter connected between the distributed winding and the recorder, an electromagnetic screen of a non-magnetic electrically conductive material located between the U-shaped magnetic conductors connected to each other, and a constant magnet It is located between the teeth of an U-shaped magnetic circuit with a supply winding, the second end of which is connected to the rectifier, and the width of its second tooth and electromagnetic screen is equal to the width of the groove of the core magnetic circuit.