DE1238335B - Hydraulic remote control device - Google Patents

Description

GERMAN W7TW> PATENT OFFICE

EDITORIAL

German class: 60-30

Number: 1 238 335

File number: G 255351 a / 60

1 238 335 filing date: October 22, 1958

Opened on: April 6, 1967

The invention relates to a hydraulic remote control device with a pressure fluid source, one supply line leading the pressure fluid to a pressure cylinder, one to the supply line connected derivation, one controlling the supply line and by means of a spring in the closed position pressed inlet valve and a drain valve pressed into the closed position by a spring.

When controlling hydraulic power devices, it is often necessary to use hydraulic relays to be installed because the control elements either do not have a sufficient flow cross-section or because they are too far from the force device and it is important that none are too large Liquid quantities have to be moved.

The previously known hydraulic relays have the serious disadvantage that they are triggered when triggered of the controlled processes work with significant delays. With certain types of application such delays are not permitted. This is especially the case when it comes to the Control of the opening of an electrical switch by emptying its control device is.

This condition cannot be met with gate valve controls, as a gate valve to close tightly needs coverage. When opening, there is a dead path that causes a time delay arises. In known hydraulic relays there are between the hydraulic control command two steps for opening: closing the pressure medium supply line and then opening it the derivation. This sequence brings a relay for even the most favorable construction functionally determined response time with itself.

The object of the invention is to avoid these disadvantages and thus to avoid a remote control device to create hydraulic relay that responds to the hydraulic control command without dead time and a immediate emptying of the power device without dead time and this emptying no resistance opposed to the acceleration of the controlled organ under the action of the evacuation pressure could delay.

This object is achieved in that the inlet valve and the outlet valve through each a piston can be opened against the spring action, one side of which the pressure in the Feed line is exposed and the other side by means of a control valve either to an outlet or, for the purpose of opening the inlet valve while at the same time closing the drain valve, to the pressure fluid source can be connected, with throttle with hydraulic remote control device

Applicant:

Jean Louis Gratzmuller,
Neuilly-sur-Seine, Seine (France)

Representative:

Dipl.-Ing. R. Müller-Borner

and Dipl.-Ing. H. H. Wey, patent attorneys,

Berlin 33, Podbielskiallee 68

Named as the inventor:
Jean Louis Gratzmuller,
Neuilly-sur-Seine, Seine (France)

Claimed priority:

France of October 23, 1957 (750 028) - -

tel are provided that a pressure drop between the source and the piston controlling the inlet valve generate so that the prevailing when the drain valve is closed on both sides of this piston Pressures are only balanced when there is no more pressure fluid through the open inlet valve flows.

The inlet valve closes as soon as the working device is filled with hydraulic fluid, under the Action of its return spring.

It goes without saying that, under these conditions, a sudden impact on the in the control line prevailing pressure, e.g. B. by this line with the hydraulic fluid source or with the Emptying container is connected, the implement can be filled or emptied without any dead time can, since the transmission speed of the control command between that prevailing in the control line Pressure-determining organ and the working device only through the speed of sound in the liquid is limited.

Characterized in that the same for feeding the implement and feeding the control line of the device Pressurized fluid source is used, the sealing of the hydraulic actuators the valves simplified.

According to a further feature of the invention, the drain valve is controlled by a piston which

709 548/213

has a larger diameter than the seat of the valve, so that this as soon as the control line with the Outlet is brought into communication immediately by the pressure of the liquid to be evacuated opens. S.

The drain valve and the piston of its hydraulic actuator can be in and out consist of the same workpiece of generally cylindrical shape that in a common bore is movable.

In addition, if the hydraulic actuator of the implement is in a certain Height is arranged above the control elements, the risk that the column of liquid contained in the supply line when the hydraulic actuating device is in rest position when the slightest occurs Pressure drop flows out. The same happens in the case of thermal expansion between the hydraulic ones Actuating device and the drain valve contained liquid column.

In order to avoid this disadvantage, the device according to the invention contains in one embodiment suitable means to keep the feed line constant to keep filled with liquid. For this purpose, the one between the inlet valve and the implement lying section of the supply line via a pressure reducing valve with the in front of the inlet valve lying section of the supply line connected. Since the drain valve is constantly on his with the help of a spring Seat is pressed, so is when the hydraulic power device of the implement is not operated the supply line is constantly filled with liquid under low pressure. To protect the pressure reducing valve A flow restriction is preferably provided upstream of the pressure reducing valve to prevent signs of wear built-in.

A ball check valve prevents the high pressure liquid from flowing back from the supply line in the direction of the pressure reducing valve, preferably in the pressure reducing valve a high pressure valve is installed.

Some embodiments of the invention are shown in the drawings and will be described below explained in more detail. It shows

F i g. 1 is a schematic representation of an embodiment of the hydraulic remote control device according to the invention and

F i g. 2 shows the main section of the device according to FIG. 1 on a larger scale, which also includes a Pressure equalization system has been added.

The in F i g. 1 shown device according to the invention is to alternately feed a working device U with hydraulic fluid, for. B. oil, from a hydraulic fluid source S, and the emptying of the implement U trigger. For this purpose, the working device U is on the one hand via a supply line 1, 11, 12, in the course of which there is an inlet valve CA, which is normally pressed elastically against its seat, to the pressure fluid source S and on the other hand via a line 12, 14, in the course of which in the example shown drain valve CP normally also pressed against its seat is connected to the emptying container 15 . The inlet valve CA is controlled by a hydraulic actuator, the piston VA of which opens the inlet valve directly, and the drain valve CP is controlled by a hydraulic actuator whose piston VP with the drain valve CP

is made from one piece. The cylinders of the two hydraulic actuation devices are connected to a common control line 3. A control valve 4, e.g. B. a three-way valve makes it possible to connect the common line 3 via a line 7 optionally to a pressure fluid source, which in turn is the pressure fluid source S in the present embodiment, and to an outlet 5 . The outlets 5 and 14 open into the operating tank 15.

The working device U shown is a single-acting hydraulic power device, the piston 8 of which is acted upon by the pressure of a spring 9 acting against the pressure fluid let into the power device. The supply line between the inlet valve CA and the working device U is divided into two sections 11 and 12 which are interrupted by a chamber 13 in which the drain valve CP is located. The two feed line sections 11 and 12 are constantly connected to one another. The section 12 at the same time forms a section of the outlet line which is controlled by the drain valve CP , the seat of which is at the opening of the other section 14 of the discharge line connected to the emptying container 15.

The inlet valve CA consists of a piston pressed onto its seat by means of a spring 16. The inlet valve CA is designed so that the liquid pressure, when it is open, acts on both of its faces. In the embodiment shown, the piston is hollow in its rear section, which is connected to the inlet line 1 by means of radially arranged holes 18. With regard to the effect of the hydraulic fluid, this valve is in equilibrium if it is open.

The flow of liquid to the inlet valve takes place via a nozzle or a throttle opening 19, the purpose of which is to reduce and regulate the pressure of the liquid flowing into the working device during the inflow period.

The opening of the inlet valve CA is effected against the action of the return spring 16 by the piston VA , which acts directly on the inlet valve CA. The drain valve CP is urged towards its seat by a spring 21. It consists of a piston that is slidable in a bore against which it does not need to be sealed off, because during the inflow and the presence of fluid in the working device, exactly the same pressure on both sides of the piston, namely the pressure of the pressurized fluid source S. , prevails.

During this time, the relief valve CP is pressed onto its seat not only by the action of the spring 21 , but also by the fact that the pressure fluid exerts a higher pressure on the surface of the piston on which the spring is located than on the annular opposite surface of the piston, since the central portion of the discharge valve which closes the outlet 14 is not exposed to this pressure.

The control device according to the invention works in the following way: If it is assumed that the implement is in the rest position, the drain valve CP is pressed by the spring 21 onto its seat, the discharge line composed of two sections 12 and 14 with no pressure

standing or at most a pressure corresponding to the pressure of the altitude of the operating tank 15 is filled with oil. The section 11 of the supply line behind the inlet valve CA is also filled with non-pressurized or only slightly pressurized oil. Finally, the control valve 4 is in position II, and the control line 3 and the outlet 5 are also filled with no or only low pressure oil. The inlet valve CA is of course urged onto its seat by its spring 16 and by the action of the fluid pressure from the source 5.

To operate the implement U bring the control valve4thto position I. In the control line 3the fluid pressure builds up and increases the effect of the return spring21the drain valve, whereby this is held strongly pressed into its seat where it was already. The fluid pressure also acts on the piston VA of Inlet valve CA and causes it to open the force of its return spring16.So there is no dead time between the point in time when you get that Control valve4thbrings from position II to position I, and the time when the inlet valve CA opens, as well as the point in time when the implement is actuated because at the beginning of the process all lines and valves were already filled with oil. The theoretical time between the Time of actuation of the control valve and the time of the start of actuation of the implement U is equal to the time it takes for the sound to pass between the two devices (inlet valve and working device) lying liquid column is required. The hydraulic fluid is accordingly so over the supply line1,11,12suddenly into the implement U let in. When the piston8thof Working device U by the hydraulic fluid against the action of its return spring9until his Stroke end has been pushed back, there is no pressure fluid flow and consequently at the throttle opening 19thno more pressure drop takes place, so that in the pressure fluid source S. ruling Fluid pressure on both sides of the piston VA of the inlet valve prevails and the spring16the inlet valve CA closes. As long as the liquid pressure in the supply line3remains that Drain valve CP closed and the implement U negative pressure.

To generate a pressure drop in the implement U , it is sufficient to bring the control valve 4 into position II. The supply line 3 is suddenly brought into connection with the emptying container via the line 5 , and the pressure behind the discharge valve CP suddenly drops. The strong pressure still acting on the annular surface in the chamber 13 lifts the drain valve from its seat, as a result of which the working device is suddenly brought into connection with the emptying container 15. The dynamic pressure of the fluid escaping from the working device keeps the drain valve CP wide open. When the emptying of the implement U is finished, the drain valve CP closes again under the action of the return spring 21. It is clear that the inlet valve CA under the action of the spring 16 and the fluid pressure prevailing in the source S during the entire emptying period and thereafter has remained closed.

The remote control device is now back in its initial position described above.

In Fig. 2 shows a device in which a single fire line controls the feeding or emptying of several working circuits 12 a, 12 b, 12 c from several supply lines la, lb, lc, Id . In addition, in the example shown, the existing device has for various reasons, namely to compensate for a possible pressure drop, in particular due to incomplete sealing of the drain valve CP, to compensate for the thermal volume reductions of the liquid and to compensate for the in the working device or in the discharge line near the At the end of the emptying process, an automatic pressure equalization device is added to the implement at the end of the emptying process under the effect of the partial vacuum that may be created by the liquid flowing out of the implement.

This pressure equalizing device includes a upstream of the throttle opening 19 branched off from the feed line 1 and in the shown example downstream of the inlet valve again in the Zuleitungll confluent line 25. In this line are arranged in a consumption barrier 26, a pressure reducing valve 30 to the maximum pressure valve 27 and a ball check valve 28th In the embodiment shown, the consumption lock 26 consists of a series of calibrated openings arranged behind and offset from one another. The valve 27 consists of a ball which is pressed onto its seat in the direction of flow by a spring 31 and which can be lifted from its seat by a shaft 32 which is fixedly connected to a plate 33 which is displaceable in a cylinder 34. The pressure reducing valve 30 also includes a tubular evacuation core 35 which is carried by the annular elastic membrane 36 of the pressure reducing valve. The provided with a seal ring upper surface of plate 33 is the lower edge of a valve-forming core 35 as a flat seat. A spring 37 urges the core 35 towards the plate 33. The existing above the membrane 36 space is connected via a in the Drain line 14 opening line 39 with the emptying container 15 (see Fig. 1) in connection. The cylinder 34 is connected via a line 41 to the ball check valve 28 , which has a return spring 42 . The stroke of the plate 33 is limited in the direction of the membrane 36 by a shoulder 43 so that the pressure reducing valve can be brought into connection with the emptying container. The spring 37 determines the operating pressure of the pressure reducing valve. When the plate 33 is in contact with the shoulder 43 , the liquid can pass from one side to the other side of the plate 33 by flowing through channels 44 present in this plate.

The mode of operation of this pressure equalization device is as follows: When the working device has been emptied, any liquid outflow through the drain valve CP in the direction of the emptying container is immediately equalized by an inflow of liquid which enters the line via the following path: pressure equalization line 25, valve 27, which passes through the The spring 37 of the pressure reducing valve is open, since the liquid outflow increases the pressure in the lines 11 and 41 and consequently in the cylinder 34

Claims (7)

has dropped, cylinder 34, line 41 and the ball check valve 28, which opens under the pressure of the approved hydraulic fluid. Every partial vacuum created at the end of the emptying process fills up automatically with the help of this pressure equalization device. In the event of an overpressure, for example as a result of a faulty sealing of the valve 27, through which the pressure equalization line 25 then constantly promotes, or as a result of the faulty sealing of the ball check valve 28, the pressure reducing valve is not damaged because the core 23 is raised under the action of this overpressure and the plate 33 as the lower surface of the plate 33 is larger than its annular area around the seat of the core 35 of the pressure reducing valve until the plate 33 comes into play against the shoulder 43, whereupon the fluid pressure continues through the channels 44 onto the membrane 36 and acts on the annular surface of the core outside its seat. The core 35 is raised further and is lifted from its seat carried by the plate 33 retained upward by the shoulder 43, the excess pressure fluid finally escaping through the bore of the tubular core 35 and via the line 39 into the drain line 14. The purpose of the consumption lock 26 is to protect the valve 27, in particular from the wear and tear of its seat. In the foregoing it has been assumed that the process was originally initiated manually with the aid of the control valve 4, but in reality this actuation is generally carried out by an automatic device such as an electrically operated slide which, for example, responds to a predetermined signal. In addition, the special design of the drain valve makes it a safety device in the manner of a safety valve. In fact, in the event of excessive pressure in the working device when the actuating device is in the emptying position, the drain valve is temporarily pushed back by the excess pressure exceeding the permissible pressure limit against the action of its calibrated return spring and remains open for the duration of the excess pressure. It should be noted that the device of the inlet valve CA of the hydraulic remote control device according to the invention, if the control line is under pressure, causes the working device to be held in the actuated position under a pressure similar to the pressure in the control line. Patent claims: 1. Hydraulic remote control device with a pressure fluid source, one the pressure fluid feed to a printing cylinder line, a discharge line connected to the supply line, an inlet valve which controls the supply line and is pressed into the closed position by a spring and a drain valve pressed into the closed position by a spring, characterized in that the inlet valve (CA) and the drain valve (CP) each have a piston (VA or VP) can be opened against the spring action, one side of which is exposed to the pressure in the supply line (1,11,12) and the other side by means of a control valve (4) either to an outlet (5) or , for the purpose of opening the intake valve can be connected with simultaneous closure of the drain valve, to the pressure fluid source (S), said throttle means (19) are provided which create a pressure drop between the source (S) and the intake valve controlling piston (VA), so that the pressures prevailing on both sides of this piston (VA) when the drain valve (CP) is closed are only balanced when the inlet valve is open ntil no more hydraulic fluid flows. 2. Remote control device according to claim 1, characterized in that the drain valve (CP) controlling piston (VP) is a single-piece differential piston with the drain valve, whose area exposed to the pressure in the supply line is smaller than that of the pressure of the source (S ) is exposed area. 3. Remote control device according to Claims 1 and 2, characterized in that the piston (VP ) controlling the inlet valve (CA) carries a rod which comes into contact with the inlet valve (CA) on its surface exposed to the pressure in the supply line. 4. Remote control device according to claim 1, characterized in that the inlet valve (CA) with the working device (U) connecting line sections (11,12) of the supply line (1,11,12) via a pressure reducing valve (30) with a front of the inlet valve (CA) lying section (1) of the supply line (1,11,12) are connected. 5. Remote control device according to claim 4, characterized in that a consumption lock (26) is arranged in front of the pressure reducing valve (30). 6. Remote control device according to claim 4, characterized in that a ball check valve (28) is arranged behind the pressure reducing valve (30). 7. Remote control device according to claim 4, characterized in that the pressure reducing valve (30) contains a built-in maximum pressure valve (27) . Considered publications:
French Patent No. 1 007 845;
U.S. Patent Nos. 2,391,035, 2,669,096. 1 sheet of drawings 709 548/213 3. 67 © Bundesdruckerei Berlin