SU92749A1 - Steam boiler power control device - Google Patents

Description

DEVICE FOR EQUIPMENT OF STEAM BOILER POWER SUPPLY

Filed on November 9, 1950 for and -138020 in State Technical University of the USSR

Published in the Bulletin of the image; genius G. 12 for I95I.

Instruments are known to control the feeding of the steam boiler by the sector, depending on the decrease in the water level in the boiler with the audible alarm of the on-line level, using a float column associated with steam and water prosarinse; : a boiler and a spool device associated with the float,

 The proposed device differs from the known ones in that it is equipped with a piston block with spring-loaded spools; communicated by means of pipes with the steam space of the spool-type device of the float column and with the discharge chamber innek: -or.

The device is designed to regulate the power of the steam tank, fed by a vertical injector of the type PC-lIs in the tank from the maximum decrease of the water level in the boiler.

The drawing shows a diagram of the device .;

The device consists of a connected tube; .. I and 2 with water and steam spaces of the boiler, with float-columns; . 3 and a spool device, the steam space of which, in turn: i, is connected by tubes 4,5 and 6 with a piston unit 7.

The piston unit consists of: pumping, a10 piston 8s, limiting piston 9, which are placed in a stepped; cylinder 10, spacer spring II between pistons; full engagement piston 12 with spring 13, depressing and spool If; rivers;: south piston 15 2 spring hb and

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spool 17, with the steam 15 acting on one side of the pair, and on the other spring; a reservoir 18, having two regime valves 19 and 20, a control spool 21 controlled by a piston 22; a closing piston 23 serving to hold the spool 21 in place, preventing its movement during the period when the injector is activated and water is fed to the boiler; the control piston 24 with a rod 25 on the piston of which, on the one hand, operates a pair of chamber 26, and on the other hand a spring 27; piston 28, which is sluiit to move valve 29.

The piston unit is installed above the injector and with the aid of the eye 30 of the terminating piston 8 is connected to the eye of the final injector post / not shown in the drawing /. By means of the tube 31, the piston unit is connected to the injection chamber of the injector, the increased pressure of water in which acts on the unit, and thus maintains the pumping piston in the pumping state. This state is maintained until the water level in the boiler rises to normal and the spool of the float column blocks the flow of steam from the column to the piston block, as a result of which the power supply to the boiler stops. This happens as follows:

As soon as the water level in the boiler reaches close to the one that is lower at the same time, the float 32 of the float column 3 will drop down, and the associated ball valve 33 will move away from the seat of its seat and open the pair S ring canaldiff (recessive piston 34). through the channels 35 it enters the upper part of the cylinder 36 and creates a pressure equal to the boiler pressure there. Due to the fact that the upper piston is larger in diameter than the lower piston, a greater vapor pressure will be created on it. As a result of the difference of forces, the differential piston 3f will start move down following the ball valve and as soon as the last valve is seated on its seat, steam access to the upper part of the cylinder will stop and the differential piston will stop. The spool 37 moves as the water level in the boiler drops to the lowest level differential piston moves so much that the spool 37 with its upper edge informs the cavity of the column 3 with the tube 4. Then the steam from the float column goes through the tube 4 into the chamber 38 of the regulating spool 21. From the chamber 38 pairs post simultaneously on the 3rd direction:

 2 -92749

The first control - steam passes through the channels 39, into the chamber W of the spool 14 and then through the channel l to the upper part of the cylinder 10, above the limiting pistons 9. Under the action of the steam, the latter moves downward, compressing the inter-piston spring II. Simultaneously from the cylinder 10 pairs of channel 42 will go to the control spool 21,

The second direction is that steam from the chamber 38 of the regulating valve goes through channel 43 to the lower part of cylinder 10 under the injection nofh 8 and from there through channel 44 to haapan 29. The injection piston 8 moves upwards under the pressure of steam, compressing additionally a piston spring II,

When the finishing piston 8 is moved upwards, the eyelet 30 moves in this direction, which raises the pumping rack of the injector, and the latter will open steam access to the injector for water suction.

The third direction is that steam from the chamber 38 of the regulating ash collector enters through channels 45 into each of the operating spool I, and from there through channels 46 and 47 into the operating reservoir 18, where it will create some pressure. In addition, the steam from the channels 46 and 47 will enter the chamber 48 of the reciprocating piston 15, where it will create pressure on the piston, which will then move, and together with it will be a new spool 17, as a result, the flow cross section of the inlet will decrease. filling the regime tank.

After the start of the block in the reservoir 18, some pressure will be created under the action of steam, which will depress the valve 20 from the seat, then the steam from the return reservoir 18 will pass through the channel 51 to the chamber 52, where the piston 24 will move to the stop 53, the rod 25 will compress the water in cylinder 49, which will go through channel 55 to the caner 54, over-; :: steve the piston 28 to the stop. When moving, the piston 28 will move upwards to the apan 29, which will open steam access from channel 44 through channel 56 to cocary 57, where it will move the piston 12 upwards along with the spool 14. The spool 14 with its notch 58 will inform the upper part of the cylinder 10 through channels 41, 59 and a recess 60 regulating the spool with an atmospheric channel 61. Therefore, atmospheric pressure will be created in cylinder 10, but since in the lower part

cylinder pressure is boiler, then piston 8 additionally leremesgiton Blehr will open completely the pumping eye of injector 30 by means of eyelet 30, as a result of which injector will supply water to the boiler. At this time, pressure builds up in the boiler and water from the injection chamber the injector will flow through channel 62 into the casing 63 of the closing piston 25, moving the latter to the lowest position, while the control spool will be held in its original position, and therefore schenie adjusting piston 22 will not occur.

When the pressure in the regime reservoir reaches higher than the calculated one, the regime piston 15 will move, and along with it the spool IV will also move, which will separate the channel 45 with the channel 7 and the flow of steam into the reservoir will stop. In this case, the channel 64 and the chamber 65 will be filled with steam, which comes from the regime reservoir 18 through the valve 19.

During the operation of the injector, the water level in the boiler, as well as in the float column 3, will rise, and therefore the float 32 will also lift, keeping the ball valve 33 in the closed state. Steam in chamber 36 will not flow to the pressure in it will gradually fall. The pressure on the upper part of the differential piston (|) of the potential piston will decrease, and on the lower part the boiler pressure will act and therefore the differential piston)) the potential piston will gradually move upwards, displacing up from the bottom 37, moving upwards, and the rotary tube 37 will untie the tube 4 with the cavity of the float column and the steam access to the block is terminated, at the same time the tube 5 communicates with the cavity of column 3 and steam from it enters through the tube 5 into the chamber 65 under the regulating piston 22 and moves it up. But since the area of the piston 22 is larger than the area of the piston 23, a greater vapor pressure will be created on the piston 22, under the action of which the piston 23 will move upwards. Simultaneously, the control spool 21 will move upward and the steam supply to block 7 will stop. At this time, under the action of vapor pressure, which is in chamber 40, the piston 9 is lowered, and with it the piston 8 is lowered, which by eye 30 closes the injection pump injection pump stand into the boiler.

When an emergency water level drops to the boiler, when the water supply is unacceptable, the device automatically stops the operation of the innator and gives an acoustic signal, by supplying steam through pipe 6 to the whistle 50, where steam is supplied with a strong decrease in the float 32 and the associated spool 37,

SUBJECT OF INVENTION

A device for regulating the power supply of a steam boiler with an injector, depending on a decrease in the level of water in the boiler and an audible warning of an emergency decrease in level, from the float column associated with the steam and water spaces of the boiler and the slide valve associated with the float, that it is equipped with a piston unit with prukinnysh spools, which is communicated by means of pipes with the steam space of the spool device of the float column and with the injector injection chamber.

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