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pump device

A technology of pump device and drive device, which is applied in pump control, liquid displacement machinery, machine/engine, etc., to achieve high flexibility

Inactive Publication Date: 2016-12-21
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantage of this pump arrangement is that it serves to supply the load with two pressure spaces arranged opposite to each other

Method used

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Embodiment Construction

[0033] figure 1 An exemplary embodiment of the pump device according to the invention is shown in the case of a maximum volumetric flow requirement of a load 1 connected to the pump device, which is designed as a constant pressure system. The pump arrangement has three metering pumps P1 , P2 , P3 connected in parallel. They are arranged in an open loop and have working lines 2, 4, 6 respectively. The working lines 2 , 4 , 6 feed into a common high-pressure line 8 , via which the load 1 is supplied with pump pressure.

[0034] The three metering pumps can have different nominal delivery volumes, according to which a distinction is made below between the large metering pump P3 , the middle metering pump P2 and the small metering pump P1 . The small fixed displacement pump P1 is designed for zero-stroke operation or pressure-maintained drive.

[0035] Distribution valves 10 , 12 , 14 are provided in the working lines 2 , 4 , 6 respectively. Each distribution valve 10, 12, 14 ...

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Abstract

A pump arrangement is disclosed, preferably as a constant pressure system, with a plurality of parallel-connected fixed displacement pumps, which are jointly driven by a variable-speed drive. Each metering pump has an associated working line, in which a distributing valve is respectively arranged, via which the delivery volume flow of the associated metering pump can be discharged to the tank. The working lines are fed into a common high-pressure line of the pump units. According to the invention, depending on a respective threshold speed of the variable-speed drive, the switch can be operated either for deactivation or inactive switching or for activating or switching the dispensing valve of the associated metering pump. This preferably takes place via a control loop. This provides a pump device whose rotational speed can be driven variably within a largely wide rotational speed range.

Description

technical field [0001] The invention relates to a pump device and a method for operating it. Background technique [0002] EP 1 564 414 A1 publication discloses a pump arrangement according to the subject matter of the invention as claimed in claim 1 , in which a hydraulic load is supplied or driven by two fixed displacement pumps coupled to one another and by a common speed-variable drive. As long as a predetermined load pressure is not exceeded, the two pumps are deactivated or inactively connected via the distribution valve by connecting their high-pressure connections to the tank. The switching of the distribution valve takes place via a control line in which the load pressure of the hydraulic load is present, ie the distribution valve is a pressure distribution valve. [0003] A disadvantage of this pump arrangement is that it serves to supply two pressure spaces arranged opposite one another. Contents of the invention [0004] In contrast, the object of the present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/00
Inventor T·格尔纳
Owner ROBERT BOSCH GMBH
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