SU437320A1 - Apparatus for producing high-speed gas jet - Google Patents

Description

(54) DEVICE FOR OBTAINING HIGH SPEED

Gas jet

The high gas flow temperature is achieved by using a high temperature core. In addition, compared with the known devices, a certain increase in the power density invested in the used part of the flow can be achieved. This is due, firstly, to the fact that the permissible power is determined by the size of the device, and in this case, a relatively large burner with sufficiently extended electrodes is used for heating. Therefore, the temperature in the core will be significantly higher than the average temperature for the entire mass of the purged gas as a whole. The life of the electrodes can be achieved sufficiently large, since the mode of operation of the device corresponds to the unstressed modes of the heating chamber as a whole.

The advantage of the proposed device is that the destruction products of the electrodes are carried by the outer part of the gas stream into the channels 10 and do not contaminate the used part of the stream. This ensures a longer service life of the exit nozzle and greater safety of the objects affected by the “useful flow.

The useful flow should be 1 / 10-1 / 3 of the total gas flow. It can be regulated not only by means of gate valves in the discharge channels, but also by moving the intermediate and output nozzles relative to each other. For this, one of them is adapted to move relative to the other.

The flow profile of the exit nozzle has a Laval nozzle profile. The annular channel also has a cross section corresponding to the profile of the Lawal nozzle.

The outlet channels are located tangentially to the direction of the outlet part of the flow, which leads to their radial location. They are also cooled by liquid.

Subject invention

Claims (5)

1. A device for producing a high-velocity gas jet consisting of a chamber. gas-heated arc discharge and a double nozzle with an opening for the exit of the gas stream located along the axis of the device, characterized in that, in order to increase the speed of the output gas stream, the nozzle made in the form of coaxial intermediate and output nozzles, the input part of the intermediate nozzle connected to the heating chamber, and the input part of the output nozzle is inserted into the central part of the outlet nozzle of the intermediate nozzle so that the output part of the intermediate nozzle and the outer surface of the output nozzle form an annular channel. 2. The device according to claim 1, characterized in that, in order to increase the efficiency device operation, the cross section of the annular channel in the direction of the gas flow has a Laval nozzle profile. 3. The device according to paragraphs. 1 and 2, characterized in that, in order to make it possible to control the amount of gas discharged through the outlet nozzle, the annular channel between the outlet part of the intermediate nozzle and the outer surface of the outlet nozzle ends in one or more outlet channels, at least one of which has a radial arrangement and a cross section that can be changed with the help of valves. 4. The device according to claim 3, characterized in that, in order to protect the seal of the valves for regulating the cross section of the outflow ducts, it has lines for supplying cold air to the seal. 5. The device according to claim 1, characterized in that, in order to enable controlling the mode of its operation, at least one of the parts of the double nozzle is adapted to move along the axis of the device. FT / V o A & x- J NXX -Y 1 iC go