AT115125B

AT115125B - Pump set for driving hydraulic fluid-operated closing devices for turbine inlets, pipelines, channels and the like. like

Info

Publication number: AT115125B
Authority: AT
Original assignee: Voith J M Fa
Priority date: 1927-11-28
Filing date: 1928-09-29
Publication date: 1929-11-25

Description

  

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 Ventil i begrenzten Druck wird auch das   Ventil !,   das einen Differentialkolben besitzt, beeinflusst, u. zw. derart, dass die Saugleitung m der kleineren Pumpe c über das Rohr n mit der Leitung f verbunden wird, d. h. die Pumpe c saugt nicht aus dem Ölbehälter, sondern das Öl wird ihr aus der Leitung f unter dem durch das Ventil   i   festgelegten Druck   zugeführt.   Dieser Druck wird durch die Pumpe c weiter erhöht und auf die Höhe gebracht, die im Raum h notwendig ist, um die Aufzugskraft für die Tafel hervorzubringen.

   Das   Rückströmen   des unter diesem erhöhten Druck stehenden Öles in das Rohr f wird durch das Rückschlagventil g gehindert. 
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 Zylinder h, die Pumpen bund c hintereinander geschaltet sind, d. h. wie eine zweistufige Pumpe wirken. wobei das von der grösseren Pumpe b zuviel geförderte Öl durch das Überströmventil abfliesst (Fig. 1). 



  Die Tafelhubgeschwindigkeit beim Anheben ist also durch die Förderleistung der Pumpe c gegeben. Nachdem der Druck vor und hinter der Schützentafel ausgeglichen, dadurch die   Auf zugskraft   vermindert 
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 und c arbeiten nun parallel, d. h. ihre Förderleistungen addieren sich, wodurch eine erhöhte Hubgeschwindigkeit erreicht wird (Fig. 2). 



   Die Hintereinanderschaltung der Pumpen tritt auch ein, wenn während des zweiten Teiles der Hubbewegung die Tafel gehemmt wird. 
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 vorrichtung angeordnet werden. 



   PATENT-ANSPRÜCHE : 
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 sind, die parallel und hintereinander geschaltet werden.



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 Valve i limited pressure will also affect the valve! Which has a differential piston, u. zw. In such a way that the suction line m of the smaller pump c is connected to the line f via the pipe n, d. H. the pump c does not suck out of the oil container, but the oil is fed to it from the line f under the pressure established by the valve i. This pressure is further increased by the pump c and brought to the level that is necessary in space h to produce the lifting force for the panel.

   The return flow of the oil under this increased pressure into the pipe f is prevented by the check valve g.
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 Cylinders h, pumps and c are connected in series, d. H. act like a two-stage pump. whereby the excess oil delivered by the larger pump b flows off through the overflow valve (Fig. 1).



  The table lifting speed when lifting is therefore given by the delivery rate of pump c. After the pressure in front of and behind the shooting board has been equalized, this reduces the pulling force
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 and c now work in parallel, i.e. H. their delivery capacities add up, whereby an increased lifting speed is achieved (Fig. 2).



   The pumps are also connected in series if the table is blocked during the second part of the lifting movement.
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 device are arranged.



   PATENT CLAIMS:
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 that are connected in parallel and in series.

Claims

2. Pump set according to claim 1, characterized in that means are provided which the Automatically switch pumps in series or in parallel depending on the pressure in the servomotor.

3. Pump set according to claims 1 and 2, characterized in that for the automatic Switching over a valve, on one side of the piston of which the fluid pressure from the pressure line of the first Pump with a spring acting on the other side of the piston, is arranged in such a way that it connects the suction line of the second pump at high pressure, which outweighs the spring pressure, with the pressure line of the first pump, at low pressure, less than the spring pressure, with the oil container .

4. Pump set according to claim 1, characterized in that when the first pump delivers a greater flow rate than the second in the pressure line of the first pump, an overflow valve is switched on which, when connected in series, the excess amount of liquid delivered by the first pump flows back into the oil tank leaves.

5. Pump set according to claim 1, characterized in that for shutting off the pressure EMI2.5 active check valve is provided in the pressure line of the first pump.

6. Pump set according to claims 1, 2 and 3, characterized in that a shut-off device operated by a reversing valve (I) is provided for shutting off the pressure line of the first pump from the servomotor when the pumps are connected in series.