DE230000C - - Google Patents

Description

IMPERIAL

Morals · <££ «η PATENT OFFICE.

PATENT LETTERING

- M 230000 CLASS 14 c. GROUP

in Berlin.

switchable additional nozzles.

Patented in the German Empire on July 7, 1910.

The invention relates to an automatic pressure control device for bleeding turbines, through which the steam pressure at the tapping point is independent of the steam consumption and the load on the turbine is kept constant.

The invention is now mainly to be used on turbines, in which a Part of the steam from a low-pressure stage

ίο Heating systems o. The like. Is supplied, whose Steam consumption is subject to strong fluctuations, but its steam pressure as possible should be kept constant. Now have fluctuations in steam extraction naturally also pressure fluctuations in the relevant stage and consequently in the Heating system result.

According to the invention, such pressure fluctuations are now caused by the tapping point avoiding the arrangement of additional nozzles that can be switched off behind the corresponding stage, which are switched on or off by a controller, its position on the one hand by a adjusting to the same pressure difference between its front and back, The throttle device built into the tapping line and, on the other hand, from the one at the tapping point even prevailing pressures is influenced. . ;

An exemplary embodiment of the subject matter of the invention is illustrated in the drawing, in which FIG. 1 shows an overall view of the device, partially in section, and FIG. 2 shows a section along the line AB of FIG.

α denotes the tapping pipe provided with an extension c , the passage cross-section of which can be regulated by the throttle element b. A number of valves f are provided between stages d and e through which, if necessary, individual nozzles can be completely closed one after the other in order to maintain an even pressure in stage d by reducing the passage cross-sections of the steam discharge to the next stage if the steam consumption of the heating systems increases. These valves f are usually kept closed by springs g and can be opened against the action of the spring by a pressure fluid acting on the piston h. The stage d is connected through the pipe i to a cylinder k in which a piston m under the influence of a spring I is arranged, which is connected by the lever η to a second piston 0 and the throttle element b of the tapping line α . A pressure fluid is fed to the cylinder p of the piston 0 through the pipe q , which, depending on the position of this piston, acts on the individual valves f through connecting pipes s. On the lower side of the cylinder p , this hydraulic fluid exits again through the pipe r.

The mode of operation of the subject matter of the invention is now as follows: The throttle member b

is given by a certain, between lower. and the pressure difference prevailing on the upper side is kept in its respective position. If more radiators are now switched on, the counterpressure prevailing on the upper side of the organ b decreases; the pressure difference becomes greater, and the throttle element is moved upwards until the pressure difference has assumed its original value again as a result of the increasing passage cross-section. The passage cross-section has increased due to the conical design of the extension c in accordance with the increased steam consumption of the exhaust steam system. Assume that the steam consumption of the heating system increases while the load on the turbine remains the same. As a result of the increasing pressure difference, the throttle element b is lifted, whereby the piston 0 is also moved upwards at the same time, which results in a corresponding number of lines s being switched off. The action of the hydraulic fluid on the piston h ceases as a result, and the valves f are closed under the action of the spring g , whereby the pressure drop that occurred as a result of increased steam extraction in stage d is compensated for again.

If, however, the steam consumption of the heating decreases with constant load on the turbine, the throttle element b and with it the piston 0 of the cylinder p decrease as a result of the decreasing pressure difference, whereby several groups of nozzles are opened in a corresponding manner by valves f and consequently an increase in pressure in the stage d is prevented.

Control takes place in the same way with constant steam consumption of the heating and changing load on the turbine. If, as a result of the increasing load on the turbine by the centrifugal governor, the main inlet valve is opened, the pressure naturally rises in stage d. Such an increase in pressure would now result in a lifting of the organ b . However, since the upper side of the piston m is under the influence of the respective pressure prevailing in stage d , it is pressed downwards against the action of the spring g____ [■ due to the stronger pressure, which causes a downward movement of the piston 0 and thus an opening of a or several groups of nozzles and thereby a reduction of the pressure in stage d to the original strength.

A corresponding regulation of the back pressure of stage d takes place when the load on the turbine decreases.

The present device can be used not only for heating systems, but also for exhaust steam systems of any kind, e.g. B. find drying systems use.

Claims (1)

Patent claim: Pressure control device for bleeding turbines with arranged behind the bleeding point additional nozzles which can be switched off, characterized in that the switching on and off of the additional nozzles brings about Control organ on the one hand by a self-acting on the same pressure difference between its front and back adjusting throttle device built into the tapping line and on the other hand is influenced by the pressure prevailing at the tapping point itself. 1 sheet of drawings.