Proportional valve

 

The valve is designed to control the flow of the working fluid in the hydraulic systems of mobile machines. Proportional valve contains a valve, controlled with one hand proportional electromagnet, and the other return spring moving in a cast housing having a Central macropodidae groove, two outer grooves, connected to each other, two cylinder channel, two cavity under the ends of the valve, connected between a drain hole in the body of the valve made an extra hole connecting the Central macropodidae groove with a drainage hole. The technical result is to enhance the functionality of the valve. 10 Il.

The invention relates to hydraulic engineering, in particular to the control of hydraulic machines with proportional control with DN DN=6 mm, and can be used in various electro-hydraulic actuators fixed systems and mobile machines.

Known for proportional valves with nominal diameter DN=6 mm type RSE manufactured GSTB HA, Gomel. Hydrauli the first valve with a nominal diameter of DN=6 mm type B, made Ulyanovsk ON Hydroaparat [2].

Also known a number proportional valves foreign manufacturers (type KDG4V, KSDG4V firm "Vickers", type S6UP firm "Herion", type 4 WRE, 3 DREP firm "Mannesman Rexroth") [3], [4].

As a prototype can be considered, for example, three-position valve 4 WRA.6...EX company "Maimesman Rexroth" [5].

In the design - prototype [5] the housing 1 has five macropodidae grooves: the Central groove 2 - channel R for the supply of the working fluid, two at 3 and 4 connected together inside the case) - channel drain T and two cylinder channel and the grooves 5 and 6 respectively. Cavity Y 7 and 8 connected between a drain hole D 9, are used for the unloading valve 10, that is, create it ends the same pressure. When applying for the winding of the electromagnet 11 signal control rod 12 moves the valve 10 in proportion to the control signal. When removing the signal valve 10 is moved to the initial position under the action of the return spring 13, while it remains in one of the working positions of the valve.

The drawbacks[1], [2], [3], [4] and prototype [5] should be attributed to the fact that typical design of cast iron housings 2 positive channels is not possible to implement complex 4-point scheme.

The aim of the invention is to enhance the functionality of the valve due to the realization of the chassis 3-way valve 4-way control schemes while maintaining the overall dimensions and weight and size parameters.

To achieve this goal in the proportional valve containing a valve, controlled with one hand proportional electromagnet, and the other return spring moving in a cast housing having a Central macropodidae groove, two outer grooves, connected to each other, two cylinder channel, two cavity under the ends of the valve, connected between a drain hole according to the invention, the casing is made an extra hole connecting the Central macropodidae groove with a drainage hole.

The technical result in the implementation of a complex 4-point schemes on the basis of the building 2 - and 3-way proportional valves which seeks to ensure control of the Executive bodies of the hydraulic drive (for example, a reversible pump for reversing the movement of the working bodies, to perform other operations in sooi" feed pump or for unloading control system in the absence of the control signal.

In the study of the distinctive features of the proposed proportional valve does not identify any known technical solutions that implement the 4-way control scheme using standard case design, for example, three-position valve, therefore, the claimed technical solution meets the criteria of the invention of "novelty" and "inventive step".

In Fig. 1 illustrates a typical design 2-way proportional valve, Fig. 2 - its hydraulic diagram of Fig. 3 - three-position valve (prototype) of Fig. 4 - its hydraulic diagram of Fig. 5 shows the inventive proportional valve of Fig. 6 - its hydraulic diagram of Fig. 7, 8, 9, 10 shows four working positions of the inventive valve.

Declare proportional valve (Fig. 5) contains a slide valve 1 is driven on one hand by the pusher 2 is proportional electromagnet 3, and on the other the return spring 4, moving in a cast iron cast housing 5 having five macropodidae grooves: the Central groove 6 - channel drain T, two outer grooves 7 and 8 (the joint between estwenno. Cavity Y 11 and 12 connected between a drain hole D 13 serve for the discharge of the valve 1. For more entered the hole About 14, plugged tube 15 connects the Central macropodidae groove T 6 with drain hole D 13.

Valve with proportional control works as follows. When de-energized proportional solenoid valve is in position 4 (Fig. 7), which implements 4-I, additional position. When applying for a proportional solenoid control signal, the valve is moved from position 4 to position 2 (Fig. 9). Further control valve and implementation positions 1 and 3 (Fig. 8, 10) are achieved by the reduction or increase of the control signal.

The connection of the drain channel T with cavities discharge, increased number macropodidae grooves to 7 allow by moving the spool to receive the connection of the respective channels R-a, R-b, a-T,-T for the implementation of a complex 4-point schemes of proportional valves.

The inventive valve is tested and used in the hydraulic system control machine harvesting complex, produced by JSC "KEMZ", , Carpet.

Sources of information 1. Ka>/p>3. C. K. Sveshnikov. Hydraulic equipment. International directory, RIA, 1995

4. Catalogue "Proportional-, Regel - und Servoventil, Elektronik-Komponenten und System", the firm "Mannesman Rexroth", 1993

5. CD-ROM Directory "Hydraulik-Komponenten für stationaere mobile und Anwendungen", Rexroth Hydraulics, 2000

Claims

Proportional valve containing a valve, controlled with one hand proportional electromagnet, and the other return spring moving in a cast housing having a Central macropodidae groove, two outer grooves, connected to each other, two cylinder channel, two cavity under the ends of the spool, interconnected drainage hole, characterized in that the housing of the valve made an extra hole connecting the Central macropodidae groove with a drainage hole.

 

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