CS239023B1 - Equipment for growing single crystals from solutions - Google Patents

Abstract

Device for growing single crystals from solutions, or rather an element for transmitting torque of the crystallizer shaft, on which a stirrer or seed carriers are mounted, ensuring complete tightness of the crystallization apparatus, where the torque of the shaft (9) is transmitted from a low-speed motor (3) on the principle of a magnetic coupling, which is symmetrical in shape according to the separating membrane (4), while in the upper part (1) the motor (3) is anchored» on whose shaft there is an upper carrier (5) with a built-in ring (7) of a magnetic circuit made of iron and permanent magnets (8) and in the lower part (2) made of tetrafluoroethylene the placement and arrangement of the lower carrier (6), the ring (7) and the permanent magnets (8) are the same, with the difference that the lower carrier (6) is firmly connected to the shaft (9) made of polymethyl methacrylate.

Description

Equipment for growing single crystals from solutions

Equipment for growing single crystals from solutions, respectively. a crystallizer shaft torque transmission element on which a stirrer or seed carrier is mounted to ensure complete tightness of the crystallization apparatus, wherein the shaft torque (9) is transmitted from a low speed motor (3) on the magnetic coupling principle which is symmetrical in shape to the separating membrane (4), in which the motor (3) is anchored in the upper part (1) »on the shaft of which the upper carrier (5) with an embedded ring (7) of the magnetic magnetic circuit and permanent magnets (8) and in the lower part (2) of tetrafluoroethylene, the support and arrangement of the lower carrier (6), ring (7) and permanent magnets (8) are the same, except that the lower carrier (6) is rigidly connected to the polymethylmethacrylate shaft (9).

239 023

239 023 (II) (B1) (51) Int. Cl?

OJ C 30 B 35/00

-1 239 023

The invention relates to a device for growing single crystals from solutions or, more particularly, to an element for the rotating parts of a crystallizer.

Perfect control of the growing process of soluble single crystals requires perfect hermetization and closure of the container growers. The impossibility of contamination of the culture solution by the atmosphere, changes in air pressure and solvent vapor leakage from the culture solution is one of the factors affecting the constant degree of supersaturation during relatively long cultivation cycles - several months - of these single crystals. Such long-term leaks cause uncontrolled changes in the concentration of the culture solution in normal operation, resulting in the formation of parasitic crystals. In the case of the cultivation of Isotopic single crystals, the main representatives of which are deuterated triglycine sulphate and potassium dideuterophosphate, especially of higher deuteration levels, the above mentioned drawbacks are accompanied by a strong isotopic exchange of deuterium for hydrogen from atmospheric humidity. their application.

The main sources of leakage of the crystallization apparatuses are penetrations of rotating parts, ie agitator shafts, seed carriers and the like, mainly due to the use of non-traditional construction materials. For corrosive reasons, polymethyl methacrylate and polytetrafuloretylene, etc. are used in such cases.

- 1 239 023 of conventional structural seals, such as a seals, because after a few weeks the shaft is severely damaged and functional properties are lost, notwithstanding the contamination of the growing solutions by the abrasion of the sealing elements.

These disadvantages are overcome by the single crystal cultivation device of the present invention, consisting of a crystallization vessel, a lid and a rotating part element, characterized in that the rotating part element consists of an upper aluminum part and a lower tetrafluoroethylene part, a separating diaphragm * is provided in the upper part of the upper carrier of polymethylmethacrylate, connected to the shaft of the reversible motor, the upper carrier incorporates both a ring of magnetic magnetic circuit and permanent magnets and lower carrier of polymethylmethacrylate connected to the shaft passing through the lid of the crystallizer, the ring carrier also having an iron magnetic circuit ring and permanent magnets incorporated therein.

In the following, with reference to the accompanying drawing, the invention is described in detail at the same time as one particular embodiment allowing the torque transmission of the crystallizer shaft to which the spreader or seed carrier is secured to ensure complete tightness of the crystallization apparatus. aggressive vapors above the base metal solution causing concentrations as low as about 10 ppm in the solution complicate the cell in the final applications of the resulting crystal elements, or in the cultivation process itself, blocking single crystal growth and shutting down the apparatus.

In the schematic vertical section, the top part 6 is made of aluminum, the bottom part 2 is made of polytetrafluoroethylene, the reversing motor 2 ^{with a} shaft separating the membrane 6, the upper carrier 2 is ^{made of} polymethylmethacrylate, the ring 6 is magnetic.

- 3 239 923 iron circuitry, permanent magnets * 8, polymethylmethacrylate lower carrier 6, shaft 2 »rubber O-ring 10, bolts 11, crystallization vessel lid 12 and flat rubber seal and flange 13.

Then the function of individual parts of the device is described. Torque hříJele 2 is transmitted from the low-speed motor 2 ^{in a} steplessly variable speed range from 0 to 40 r / rain on the principle of magnetic coupling, which is dimensionally symmetric with the separating membranes on the top part χ aluminum is anchored reversible motor 2 ^»whose shaft is fixed the upper support 2 ^{and with an} integrated ring χ of the megnetic iron circuit and several circular permanent magnets 8.

The carrier rotates without contact in the upper part 7. In the lower part 2 of tetrafluoroethylene, the mounting and arrangement of the magnets in the lower carrier 6 is the same, and the shaft 2 of polymethylmethacrylate is fixedly mounted on the lower carrier 6. Both parts are hermetically separated by a membrane 4 which, under the action of bolts, is pressed against the rubber ring 10, so that the lower carrier 6 with a shaft 2 rotates in a space communicating with the inner space of the crystallization vessel. The lower part 2 is mounted on the lid flange 13 and sealed to the atmosphere by a flat rubber 14 by the action of bolts 11.

The device according to the invention guarantees long-term trouble-free operation without the need for any intervention during the growing cycle.

Claims (1)

SUBJECT OF THE INVENTION Apparatus for growing single crystals from solutions, consisting of a crystallization vessel, a lid and an element for rotating parts, characterized in that it consists of an upper part of aluminum and a lower part of tetrafluoroethylene, between which a separating membrane (4) is provided and (1) a top carrier (5) of poly (ethyl methacrylate) is connected to a shaft of a reversible motor (3), wherein an upper ring (5) incorporates a ring (7) of an iron magnetic circuit and permanent magnets (8); In part (2) there is provided a lower carrier (6) made of polymethylmethacrylate, firmly connected to a shaft (9), passing through the crystallizer cover (12), and in the lower carrier (6) there is also a ring (7) permanent magnets (8).