SU398838A1 - DEVICE FOR MEASURING THE TEMPERATURE) OF MELT CRYSTALLIZATION - Google Patents

Description

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The invention relates to devices for determining the temperature of melt crystallization, nalimer, ammonium nitrate, urea, etc.

Devices are known for the model of the temperature of the temperature of the “localized melts”, containing-rubbing the sensitive SvieMeHT, iroboboric, made in the form of periodically communicating with the source of the refrigerant serpentine: registering device -i Ko, mandated circuit.

The disadvantages of such a device are a large period of its operation (about 20 minutes), also lack of reliability and explosive gear.

To increase the reliability and speed of measurements in the proposed device, the coil is made in the form of a spiral, the envelope of which the turns of the coils form a closed, for example, spherical cavity, and the termite-sensitive element is spaced out of the kites.

The drawing shows a schematic of an omnibus device.

The device consists of a spherical coil /, complete from an integral TO / I-wall tube. In the center of the internal cavity of the emeevik there is a sensing element for temperature measurement, made in the form of a low-inertia pneumatic

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the throttle bridge 2 with the cross-switching of the laminar 3 and the turbulent 4 throttles, a differential pressure transmitter 5 connected to the secondary pneumatic recording device 6 and the pneumatic co-mandator 7, containing two two pressure sensors 5 and 9, two three-membrane adders W and // and non-optimized 12.

From the coil 1 vertically waste. t is supplying 13 and outgoing 14 tubes. A reducer 15a is installed on the supply pipe / valve; a valve 16 for supplying refrigerant (air, water) to the coil.

The sensing element is supplied with air at a constant pressure from the reducer 17. For the control of the pressure supply, 1 serves as a motherboard GTp 18.

The device works as follows.

When a spherical coil is immersed / melted in flow, snake to 1 and throttles inside it 3 n 4 Pne.matyokogo bridge 2 after a while warm up and perceive the technical heat of the overheated melt, the tray of which freely flows through the slots of the BHTIKOB coil / i; chokes 3 and 4.

With the change in the temperature of the chokes, their pneumatic resistances-1 change; 1. The degree of change of saprotilevlevn laminar3

cDaneiiii changes significantly in the resistance of turbulent chokes 4, and since the laminar chokes are on the opposite shoulders of the bridge, the temperature change of all chokes causes a corresponding change in pressure drop, which can be removed from the measuring diagonal of bridge 2 and depending on the differential pressure transmitter. also the change in pressure at the output of the dnmanometric converter 5. The arrow of the recording device 6. while heating the coil / and the throttles 3 and 4 continuously moves up.

If the temperature reaches the temperature corresponding to the MSG of the maximum possible crystallization temperature, the output at the output of the differential manganogamy and reobrazo: floater 5 staovit. equal to the setting pressure of the setting device 8 and the diaphragm unit of the adder 10 moves to the upper level, this opens the lower nozzle of the adder. As a result, the pressure at the outlet of the sum of the mater 10 becomes the ravi of the preset pressure of 9), i.e. it becomes equal to the pressure IB average 1 s (totalizer chambers //).

The diaphragm unit of the adder 11 due to the pressure of the feed supplied through it) i.e. the nozzle (and the upper position moves. At the outlet of the adder 1-1 it becomes paiBHbiM to the pressure of the litany. This pressure through the inhaler 12 enters the tube 16 and opens the air supply into the tube snake / cooling it.

During the initial period of cooling of the pipes, the coil / is covered with a cortex of the crystallized vapor. This crust hermetically closes the gaps between adjacent coils of the serpentine / and stops the flow through the serpentine /. .

Thus, in the internal spherical cavity coil /, a certain constant volume of the melt slurry, in which sensitive chokes t3} 4 of the temperature gauge of the thermal gauge is located, turns out to be insulated. With the further cooling of the serpentine. is cooled, the pressure after the differential pressure converter 5 drops, and the arrow of the repetitive iribor 6 goes down.

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Due to the fact that the serpentine / butpipe tubes are thicker than solid nitrate, the temperature of the conduit is low: they get heated and the temperature of the sample decreases more slowly.

After changing the state of aggregation, the temperature of the sample decreases again, the pressure after the differential pressure converter 5 drops again, and the needle of the recording device 6 is lowered. When the temperature reaches the minimum possible crystallization temperature, i.e., when the pressure after the diff: gauge converter 5 is equal to the pressure of the pressure setting device 5, the diaphragm unit of the adder W is lowered and the upper iHi .ee nozzle opens, the outlet pressure. the adder 10 becomes equal to the pressure of the setter 8 of the pressure and the membrane black of the summator of the matrix 11 is also lowered.

The pressure at the outlet of the adder 1: 1 drops to zero, the valve 16 closes and opens air flow for cooling the coil.

The melt of nitre flux again begins to warm up the coil 1, and the cycle of operation of the device is repeated.

The use of the proposed construction allows the selection, its cooling, crystallization, and the measurement of the crystallization temperature not directly in the note itself; shorten the cycle of the device to 10-12 minutes; vary as much as possible and minimum the crystallization non-surface, i.e. coiKpaTiiTb to a minimum of fluctuations in coil temperature and melt of ammonium nitrate.

The device provides an explosion-proof process;

PRED MET & A REFERENCE

A device for measuring the crystallization temperature of an arrays containing a serpentine to supply refrigerant n temperature-sensitive, elsmeite, included in a regi-regiration circuit, characterized in that, in order to improve speed and reliability, the coil is designed as a spiral , the envelope surface of the coils of which forms a closed, for example spherical cavity, and the temperature-sensitive element is placed inside the coil.

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