SU818640A1 - Apparatus for producing high-hydrostatic pressure and temperature - Google Patents

Description

The invention relates to general-purpose devices for carrying out physical and chemical processes at high pressures and temperatures and can be used, for example, for growing crystals under pressure, sintering products from powders, etc.

A device for creating high hydrostatic pressure and temperature, comprising a housing with a central hole in which a shutter, a heater and a plug with electric inputs are installed, a set of supporting rings mounted on the housing, and channels for supplying coolant made on the periphery of the housing parallel to its axis [ 1]. The device operates at pressures up to 11 kbar and temperatures up to 1200 ° C. The temperature gradient is set by the size and shape of the heater.

It is also known a device with an internal heater for pressure up to 12 kbar and temperatures up to 1200 ° C, containing a housing fastened by a set of supporting rings and cooled by passing fluid through spiral channels made on the outer surface of the housing [2].

The disadvantage of this device is its low reliability, especially when holding under pressure and at a temperature of several days, due to the low cooling efficiency of the device due to the limited area 5 of the contact of the coolant with the cooled parts; due to a decrease in the strength of the housing or supporting rings due to a decrease in the contact area of the fastened parts or due to the presence of stress concentrators in the form of channels, grooves, grooves in the housing.

In known devices having a housing with spiral grooves, a decrease in the contact area of the fastened parts is 30-50%, which leads to a decrease in the bearing capacity of the housing by 15-25%. Axial channels in the housing reduce its bearing capacity and cause the need to increase the dimensions of the device or reduce the operating pressure.

The aim of the invention is to increase the reliability of the device by increasing the contact area of the coolant with the heated parts of the device and eliminate stress concentrators.

This goal is achieved in that the channels for supplying coolant are formed by annular grooves made on the end surfaces of the rings facing each other.

The drawing shows the proposed device.

The device comprises a housing 1 with supporting rings 2 pressed onto it and a casing 3. On the end surfaces of the rings 2 facing each other, annular grooves are formed forming channels 4 into which coolant is supplied through the holes 5 in the casing 3. A piston 6 with a seal 7, a heater 8 and a plug 9 with several conical insulated electrical inputs 10 are installed in the central bore of the housing 1. The heater 8 with a resistance of 3-5 ohms is made in the form of a spiral of heat-resistant wire and is isolated from the housing walls with a screen 11 of asbestos or pyrophyllite with a thickness of 10-12 mm with a diameter of the working cavity of 40 mm. The tube 9 is equipped with a support ring 12 and a seal 13 and is mounted on a plate 14, rigidly fastened to the casing 3.

The device operates as follows. ;

A plug 9 and a high pressure cell containing a heater 8, a sample and thermocouples (not shown) are installed in the hole of the housing 1, the base plate 14 is fastened to the casing 3. Then, a working fluid, for example silicone oil, is poured into the central hole and a piston 6 is installed The device is placed on a press die plate. When a press is applied to the end face of the piston 6, the working fluid is compressed in the central bore of the housing 1. Upon reaching a predetermined pressure, electric current is supplied to the heater 8, and coolant is supplied to the annular channels 4 through the bore 5 in the housing 3. The required temperature gradient in the working volume is achieved by changing the flow rate of the coolant.

After the sample is held at the specified parameters, the electric heating and the supply of coolant are stopped, the return stroke of the press is turned on, the device is dismantled.

In this device, the cooling efficiency is increased compared with the known device by 2.2 times due to an increase of up to 5 times the area of contact of the coolant with the heated parts.

Due to the increased cooling efficiency and the absence of stress concentrators in the housing, the reliability of the device is increased, which allows to increase the pressure up to 20 kbar at a temperature of up to 1200 ° C.

Claims (2)

filled on the face surfaces of the rings facing each other. The drawing shows the proposed device. The device comprises a housing 1 with supportive rings 2 pressed on it and a casing 3. On the end surfaces of the rings 2 facing each other, annular grooves are formed, forming channels 4 into which cooling fluid is fed through the holes 5 in the casing 3. A piston 6 with a seal 7, a heater 8 and a stopper 9 with several conical insulated electric leads 10 are installed in the central opening of the housing 1. The heater 8 with a resistance of 3-5 Ohms is made in the form of a spiral of heat-resistant wire and is insulated from asbestos or pyrophyllite 11 10-12 mm with a working cavity diameter of 40 mm. The stopper 9 is provided with a supporting ring 12 and a seal 13 and is mounted on the plate 14, rigidly fastened with the casing 3. The device works as follows.; The casing 9 and the high pressure cell containing the heater 8, the sample and thermocouples (not shown) are installed in the opening of the housing 1, the base plate 14 is attached to the casing 3. Then the working fluid, for example silicone oil, is poured into the central opening and a piston is installed 6. The device is placed on the press plate. When a pressing force is applied to the end of the piston 6, the working fluid is compressed in the central opening of the housing 1. When the specified pressure is reached, electric current is supplied to the heater 8, and cooling fluid is fed to the annular channels 4 through the opening 5 in the housing 3. The required temperature gradient in the working volume is achieved by varying the coolant flow rate. After the sample is held at the specified parameters, the electrical heating and coolant supply are stopped, the press reverses, the device is dismantled. In this device, the cooling efficiency is increased 2.2 times as compared with the known device due to an increase in the contact area up to 5 times by cooling 1, it has liquid with heated parts. Due to the increased cooling efficiency and the absence of stress concentrators in the housing, the reliability of the device is increased, which makes it possible to increase the pressure to 20 kbar at a temperature of up to 1200 ° C. Apparatus of the Invention A device for creating a high hydrostatic pressure and temperature, comprising a housing with a central hole in which a piston, a heater and a stopper with electrical leads are installed, a set of supporting rings mounted on the housing, and channels for supplying a coolant, characterized in that increasing the reliability of the device, the channels for the supply of coolant are formed by annular grooves made on the end surfaces of the rings facing each other. Sources of information taken into account in the examination 1. Preobrazhensky A. Ya., Stepanov V. A. Growing single crystals under high gas pressure. “Instruments and Experimental Technique, 1965, No. 2, 196-198. 2. Tsiklis D.S. Technique of physicochemical studies at high and superhigh pressures. M., “Himi, 1976, p. 119, fig. 3.43 (prototype). //