DE2260457A1 - POWER DISTRIBUTION DEVICE FOR A HYDRAULIC SYSTEM WITH SEVERAL DIFFERENT LOAD CAPACITY - Google Patents

Description

Hanover, d. December 4, 1972 WP 34/72

Westinghouse brake and. Apparatebau GmbH, Hanover

Flow divider device for a hydraulic system

with several different loadable consumers

The invention relates to a flow divider device for a hydraulic system with several different loadable consumers and a hydraulic pump common to all consumers.

The previously known devices of this type put them together flow dividers connected in series, each consisting of two measuring orifices and a pressure compensator with a piston slide which can be acted upon at the end via the heessing orifices. Such flow dividers, which each divide a main flow into two identical or different partial flows, are described in more detail, for example, in DT-AS 1 222 376 (our WP 4/63 file). The series connection of several flow dividers of this type has the consequence that the pressure medium has to flow from the pump to each consumer through several heating orifices and pressure compensators, which entails considerable pressure losses. In addition, this makes the device - especially in hydraulic systems with an uneven number of consumers - very expensive. In this case, in addition to the complexity of the equipment, there is the additional disadvantage that in one of the _{flow dividers one of the discharge lines remains unused v} and has to work as a return line.

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The invention is based on the object of a current plate device of the type mentioned to create the calibration through low pressure losses and through a device and. according to order simple structure, which is suitable, extensions or restrictions of the hydraulic system by individual Consumers in a simple manner.

This object is achieved in that each Consumers a known per se of a measuring orifice and a pressure compensator is assigned to the current regulator via a Feed line can be connected to the hydraulic pump and via a discharge line to the consumer and one can be displaced in a housing Has piston valve on the one hand via the supply line and the measuring orifice arranged in this and, on the other hand, can be actuated via a control line common to all current regulators and with a housing edge forms a variable throttle connected between the supply line and the discharge line, the common control line with the down conductors via consecutively connected Alternating check valves can be connected in such a way that the highest consumer pressure is always applied to them.

In this way, a perfect current division is achieved with the help of structurally simple current regulators, with the partial currents to the individual consumers through only one current regulator and thus through only one measuring orifice and one Flow pressure compensator. The parallel connection of the current regulators also makes it possible to expand or restrict the Hydraulic system around individual consumers only required to switch their current regulator on or off.

- 3 A 0 9 8 2 A / 0 1 9 2.

In the following two embodiments of the invention are below Described in more detail with reference to the drawing.

Eb shows:

Pig. 1 a hydraulic system with an even number of single-acting cylinders with different load capacities, which are fed by a common hydraulic pump, partly shown schematiach, partly symbolically,

FIG. 2 shows a variant of the system according to FIG. 1 with an odd one Number of cylinders, also shown partly schematically, partly symbolically.

The system shown in Fig. 1 forms a hydraulic system, consisting from a hydraulic pump 1, a Stromteilereinriohtung 2 and four consumers designed as single-acting working cylinders 3a, 3b, 3o and 3d.

The current divider device 2 has four current regulators 4a, 4b, 4c unc 4d, each consisting of a measuring orifice 3a, 5b, 5c or 5d and each a pressure compensator 6a, 6b, 6c or 6d, as well as three changeover check valves 8, 9 and 10.

The current regulators 4a, 4b, 4c and 4d are of identical design. Therefore, only the current regulator 4a is described in more detail below. The measuring orifice 5a forms a fixed throttle part. The pressure compensator 6a has a housing 11 with one in it displaceable piston valve 12, which with a housing edge 13 is located in a housing chamber 14-changeable Throttle forms.

The current regulators 4a, 4b, 4c and 4d are connected to a common Main supply line 15 via one supply line 16a, 16b, 16c or 16d connected. The main supply line 15 is via a directional control valve 17 can be connected to the hydraulic pump 1. The leads 16a, 16b, 16c and 16d contain the measuring orifice 5a, 5b, 5c and 5d, respectively of the corresponding current regulator. They open into the housing chamber 14 of the corresponding pressure compensator.

The current regulators 4a, 4b, 4c and 4d are on the other hand with the associated consumer 3a, 3b, 3o or 3d via one discharge each 18a, 18b, 18c and 18d in connection, which are also included in the Housing chamber 14 of the corresponding pressure compensator opens.

Of the housing chambers 14 will also return lines 19a, 19b, 19c and 19d, respectively, each with a check valve 20a, 2Ob ₁ 20c and 2oD from, which is connectable via a common bus line 21 and the directional valve 17 with a sump 22nd

The current regulators 4a, 4b, 4c and 4d are also connected to a common control line 23 via a branch line 24a, 24b, 24c and 24d, respectively.

The changeover check valves 8 and 9 are each connected to lines 29a and 29b or via two input connections 25 and 26 or 27 and 28. 29c and 29d connected, each with a lead 18a, 18b, 18c and 19d are connected. They are also each via an output connection 30 and 31 are connected to lines 32 and 33, each of which is connected to an input port 34 or 35 of the interchangeable return

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Check valve 10 open. The latter is also about one Output connection 36 with the common control line 23 in connection .

The flow divider device of Fig. 1 operates as follows

The piston slides 12 of the pressure compensators 6a, 6b, 6c and 6d are connected on the one hand to the Pump pressure, on the other hand via lines 24a, 24ΐ », 24c or 24d applied to the pressure in the common control line 23 The exchange check valves 8, 9 and'10 effect due to their Circuit diagram that the common control line 23 was always below the highest of the prevailing in the working cylinders 3a, 3b, 3c and 3d Consumer pressures.

The piston slides 12 of the pressure compensators 6a, 6b, 6d and 6d are positioned as a result of the pressurization on both sides so that on the same pressure prevails on their end faces, so that the measuring orifices 5a, 5b, 5c and 5d are independent of a different one Loading of the working cylinders 3a, 3b, 3c and 3d steadily from in the ratio constant amounts of pressure medium are flowed through. This ratio is determined by the flow cross-sections of the Orifice plates 5a, 5b, 5c and 5d are specified and can therefore be adjusted by exchanging the orifice plates. It is assumed here that that the pump flow remains constant when it is divided into different partial flows. Should, however, the pump current are divided into equal partial flows, the flow divider device can then also be used in systems with a variable pump flow can be used.

409824 / 01-92-

The system according to FIG. 2 differs from the system according to FIG Pig. 1 only in that it has a working cylinder 3e more. A flow regulator 4e is also assigned to the working cylinder 3e, which is designed identically to the other current regulators 4a to 4d and is connected analogously to them. The single ones Components of this circuit have the same reference numbers as the other consumers, but with the letter e, marked.

An additional changeover check valve 40 is via input connections 41 and 42 are connected to lines 29d and 29e, which are each connected to a discharge line 16d or 18e. The Weohsel check valve 40 is also via an output connection 43 and a line 44 to the one input connection 28 of the shuttle check valve 9 connected.

The parallel connection of the current regulators 4a, 4b, 4c, 4d and 4e thus enables an expansion from four to five consumers in a simple way by connecting the flow regulator 4e and the changeover check valve 40 via additional branch lines.

The operation of the device according to FIG. 2 corresponds to the operation the device according to Figure 1 and is therefore not described in more detail.

^ s is also possible, the measuring orifice and the pressure balance of the individual Flow regulator 4a to 4e together with the associated check valve 20a, 20b, 20c or 20e combined in a common To accommodate housing and the resulting device several times according to the respective number of consumers to mount on a plate. A09824 / 0192

Claims (1)

Claim ΙΐΌ \) 1 + θΙ Stromteil he device for a hydraulic system with. several differently loadable consumers and a hydraulic pump common to all consumers, characterized in that each consumer (3a, 3b, 3c or 3d) is known per se from a measuring orifice (5a, 5b, 5c or 5d) and a pressure compensator ( 6a, 6b, 6c or 6d) existing flow regulator (4a, 4t> _t 4c or 4d) is assigned, which is connected to the hydraulic pump (1) via a feed line (16a, 16b, 16c or 16d) and via a discharge line ( I8a _f 18b, 18c or 18d) can be connected to the consumer and has a piston valve (12) which can be displaced in a housing (11) and which, on the one hand, via the supply line and the measuring orifice arranged in it, and, on the other hand, via a control line (23 ) can be acted upon and with a housing edge (13) forms a variable throttle connected between the supply line and the discharge line, the common control line being connected to the discharge lines via alternating check valves (8, 9 and 10) connected in series is indable in such a way that it is always with the. the highest consumer pressure is applied. 409824/0192