DE2322284A1 - DEVICE TO KEEP A WORKING FLUID UNDER A CERTAIN PRESSURE - Google Patents

Description

Hold pressure su

The invention relates to a torque device in a working fluid hold it under a certain pressure bu, this device having a pressurized fluid source in connection with a canter variable capacity, for example a cylinder arrangement, and the pressure of this fluid Im reversed Sensing how the volume varies, which is occupied by this fluid in the chamber of variable capacity, where the value of the pressure of the working fluid is as close as possible a value selected beforehand for each vert of the variable volume.

309847/0817

Devices such as sum devices are already known Regulate the pressure with at least one cylinder arrangement attached to one of its elements at a fixed point is articulated and from which one point of the other element is displaceable along a certain path on which this cylinder arrangement is remains inclined during its rotation about the fixed point, the piston of this cylinder arrangement of the Wrikung remains exposed to the pressure of the fluid supplied by a pressurized fluid source, this cylinder arrangement in turn pressurizes a hydraulic working or nutating fluid, the pressure of which is thus a function of that of the fluid itself Source as well as the cosine of the angle of inclination of the axis of the cylinder arrangement articulated on its path is.

By referring to the various design parameters of the Gate direction acts, one can so a given law of change the fluid pressure of this source has a certain law of change the pressure of the working fluid as a function of the changes the capacity of the chamber with variable »capacity let correspond, whereby this law of change is adjacent to an ideal law of change, which is called Has set a goal, can be.

The invention now proposes a device for a working or useful fluid under a certain pressure to keep by considering the pressure changes of a fluid supplied by a pressurized fluid source of the type considered above afflicted with a correction factor that not only depends on the cosine of a variable angle but also on the ratio of the trigonometric variable angle functions depends, which makes it possible to vary within the broadest limits To obtain correction factor.

The device according to the invention, in which a working fluid is kept under a certain pressure in a line

309847/0817

and an auxiliary fluid pressure source in communication with a variable chamber - Capacity is used, with the vert dee Pressure of the auxiliary fluids in the opposite sense as the value of the The volume that it occupies in the chamber varies,

is characterized by a. Group of at least two cylinder assemblies and at least one rocker that. separately is hinged to a first element, which is a first and a «wide cylinder arrangement of the entire group, the cylinder being one of the cylinder arrangements of the group, which is connected to this auxiliary fluid source, forms this chamber -variable capacity and the cylinder one second cylinder assembly of the group is in communication with this line and filled with working fluid or Hutzfluid is.

For example, embodiments of the invention will now be explained in more detail with reference to the drawings be, In which

Figure 1 shows a first embodiment according to the invention with two cylinder arrangements and a rocker arm * in a triangular shape are arranged, shows;

Figure 2 shows a second embodiment according to the invention with swel cylinder arrangements and a group of one Quadrangular wings;

FIG. 3 shows a particular embodiment of the one shown in FIG device shown;

FIG. 4 shows a variant of the one shown in FIG Contraption; and

Figure 5 is a graph showing various Positions of the device according to FIG. 4 are those exercised by the collector and, on the other hand, those given to the working fluid Face pressure.

309847/0817

In Figure 1, 1 denotes a pressurized fluid source, which after this Example from a tSlpneumatic, a compressed gas bladder 2 inclusive collector exists.

The gate direction according to the invention comprises ewei RegelsylInderanordnung 3 and 4, the axes of which form an angle with one another. The bodies of these cylinder arrangements are fixed, for example, and a rigid rocker 5 of a fixed length connects the rods of these cylinder arrangements with one another, on which the rocker 5 is articulated. The cylinder arrangements 3 and 4 and the rocker 5 form a deformable triangular shape, the rocker 5 of the cylinder arrangement 3 forming a variable angle f and with the cylinder arrangement 4 a variable angle β , the inner angle of the triangle opposite the rocker 5 having a value 4t .

The cylinder of the cylinder arrangement 3 is connected to the collector 1 via the line 16 and the cylinder of the cylinder arrangement 4 includes a hydraulic working fluid supplied through line 17 and its pressure at a value of:

p _e p -J- sin (Y + α- rt / 2) ρ S, cos £ u 4 cos Γ * ^ cos Y

where S is the surface of the piston of the cylinder arrangement 3, -6 is the surface of the piston of the cylinder arrangement 4 and Tf, β and α have the respective meanings mentioned above and P equals the pressure in the collector 1 for the considered value of the angle Y and the angle β 1st.

For the special case where the cylinder arrangements 3 and 4 are perpendicular to each other, cos / 3 «sin V and the value of the pressure P _u results:« ti:

309847/0817

According to a modified embodiment, the rocker 5 fixed, the body of the cylinder assemblies 3 and 4 be mounted un one and the same movable pivot point.

The embodiment according to the invention shown in Figure 2 comprises atwei control cylinder assemblies 3 and 4 _f, the axes of which are arranged according to the diagonals of a deformable quadrangle, which is formed from four rockers 10, 11, 12 and 13 of a certain length, one below the other at 6, 7, 8 and 9 are articulated. One of the elements (e.g. the body) of the cylinder assembly 3 is articulated at 8; the other element (the rod) of the cylinder 3 is articulated; stored at 6. One of the elements (e.g. the body) of the cylinder assembly 4 is articulated at 9, the other element (the rod) of the cylinder assembly 4 is articulated at 7.

According to the embodiment shown in Figure 2, the axis of the cylinder assembly 3 has a fixed direction; the joint— point 8 is fixed; the pivot point 6 can be moved according to the diagonals 6-8 of the square.

The cylinder arrangement 3 is via a line 16 with dt hydropneumatic collector 1 connected and the cylinder assembly 4 encloses a hydraulic working fluid supplied by line 17.

In the case shown in the figure, the rockers form a parallelogram and the pressure P _u of the hydraulic fluid supplied by the cylinder arrangement 4 has a value of:

P = P -IL sin Y ' ρ _S sin V u ^r ^ T sin jgt ^r ^ 5 "sin / 3 *

where Y and Y * denote the angles which the cylinder arrangement connected to the storage unit forms with successive wings forming the parallelogram; β and / 3 'are the angles which the fluid under the pressure P _u

309847/0817

supplying cylinder assembly forms each with the rockers opposite to the preceding rocker; S is the surface of the piston of the cylinder assembly 3; 4> is the surface of the piston of the cylinder arrangement 4 and P is the value of the pressure in the memory for the considered value of the angles Y and β or Y 'and / 3'.

the special case where any animal corner is involved

there pressure P _u given

S sin Y 'sin 6

delt, is the value of the pressure? _u given by the formula:

ρ ρ-A.
u A sin p ^f sin θ *

Here, Y * is the angle which the cylinder arrangement 3 connected to the accumulator forms with any first rocker; Are the angle of the animal corner at the tip of which the cylinder assembly 3 is hinged to the first rocker; ß * is the angle that the cylinder arrangement 4, which delivers the fluid at the pressure P _{u, forms} with a second rocker compared to the first in the animal corner and 0 * is the angle of the quadrilateral at whose apex or corner the cylinder arrangement 4 and the second rocker are hinged .

When manufacturing the door direction according to the invention, the technician selects the value of the parameters formed by the lengths of the swing arms; as well as the angles such as Y, ß ₉ Y 'and ß ¹ and the ratio of the cross-sections -χ- of these cylinder arrangements, so that the function P _u »f (P) is adapted to the particular working conditions.

Modifications within the scope of the measure according to the invention are readily possible; in particular, the swing be designed such that they form a deformable concave, convex or crossed quadrilateral. One of the cylinder arrangements For example, the cylinder arrangement 3 can have a fixed articulation (the articulation 8), the other Linkage can be movable and displaceable along a certain path that extends from the diagonal of the

309847/0817

Animal corner is different.

The special embodiments of the invention shown in FIGS. 3 and 4 comprise ewei rule syllable arrangements 3 and 4, the elements (piston rods and cylinders) of which are connected by rockers 10, _9, 11, 12 and 13, which are located at 6, 7, 8 and 9 in the corners of an animal corner are articulated old into one another perpendicular diagonals, which is a building in these two embodiments.

One of the hinge points · one of the cylinder projections, for example The radio 8 of the cylinder arrangement 3, is fixed, the other can be felt according to the diagonal of the animal corner (according to the arrows).

SIn cylinder one of the cylinder arrangements, for example the cylinder arrangement 3 »1 with the memory 1 via the line 16 connected; the other includes hydraulic working fluid supplied through line 17 and whose pressure value is essentially equal to:

where - £ - is the corresponding value of half the opening angle of the animal corner in its corner located in the fixed (tolenkpunkt 8; S is the piston area of the cylinder arrangement 3 and A> the piston surface of the cylinder arrangement 4 · Bel P is the value of the pressure in Memory 1 for the considered value of the angle - | ".

In the case where the animal corner with suelnander vertical diagonals formed by the wings 10, 11, 12 and 13 is not is a diamond and half the opening angle - * - of this animal corner In its corner 6 1st and 8 is not equal to the angle - ^ -, results in corner 8 opposite corner 6:

^p u - 4- ^p 4- ^(t * 4- ⁺

309847/0817

In an example, FIG. 5 shows the stroke C as a function of the Cylinder arrangement 3, expressed in meters, the changes in pressure F in an oil pneumatic cylinder arrangement that «wipe the extreme pressures 100 and 300 bar works, with the corresponding The change in volume of the gas in the storage tank is 100 liters.

! In this special case the control device has the shape of a rhombus and it becomes - ^ g- «1 (i.e. one has cylinder arrangements 3 and 4 of the same cross-section selected)

In the graphical representation, the curve of the pressure change F _u , which can be obtained in this way, is shown, with this change curve differing greatly τοη from the one representing the change τοη Ρ.

In the example under consideration, the angle - | - varies between 38 ° 6/10 and 67 ° 4/10, which makes it possible to have two equal values of the pressure P obtained for the extreme positions of the cylinder arrangements eu.

When acting on the parameters formed by the ratio -j- and the change interval of the angles ^ - and <- £ -, the _{person skilled in the art can modulate the curve of the pressure change P u in} order to adapt it to the particular working conditions.

- patent claims -

309847/0817

Claims (13)

Claims 1. Device to take a working fluid in a line to hold a "certain pressure, with one under pressure." standing auxiliary fluid source in connection with a chamber variable capacity, the value of the pressure of the auxiliary fluid in the opposite sense as the value of the volume, that it occupies in the chamber varies, characterized by a group of at least two cylinder assemblies and at least one rocker, which is separately articulated to a first element, which is part of a first and a second cylinder arrangement of this group, the cylinder being one of these cylinder arrangements of the group is connected to this auxiliary fluid source and forms the chamber of variable capacity; and dad the top hat a second cylinder arrangement of the group is connected to this line and filled with working fluid. 2. Device according to claim 1, characterized in that the second elements of the cylinder arrangements of this group are firm. 3. Apparatus according to claim 2, characterized duroh two cylinder assemblies (3; 4)> which form a certain angle with each other and age this rocker (5) the shape of a Have triangles, which duroh relative displacement of the first elements of the cylinder assemblies (3; 4) with respect to of the second elements of these cylinder assemblies are deformable is. 4. Apparatus according to claim 1, characterized in that two cylinder assemblies are provided; that the swing arm is solid; and that the second elements of the first and second cylinder assemblies are articulated about a movable hinge point, the group of these cylinder assemblies and this rocker form a triangular arrangement, 309847/0817 by shifting this movable articulation point under the effect of the relative movements of these second elements with respect to these first elements of the cylinder - arrangements is deformable. 5. Apparatus according to claim 1, characterized by two Cylinder arrangements (3; 4) and animal each with two articulated Swing (10-13), these swinging form a square and each of the elements of the cylinder arrangements of the Each pair is articulated at one of the corner points (6-9) of this quadrilateral; and that the axes of these cylinder assemblies are arranged according to the diagonals of the square. 6. Apparatus according to claim 5 »characterized in that one of the cylinder arrangements has a fixed articulation point (8), the other articulation point along a specific one Railway is displaceable. 7. Apparatus according to claim 5, characterized in that one of the elements of one of the cylinder assemblies is held in a fixed position. 8. Apparatus according to claim 5 t, characterized in that these wings form a concave square. 9. Apparatus according to claim 8, characterized in that the opposing wings of the quadrangle to each two are of equal length. 10. Apparatus according to claim 8, characterized in that this square is a diamond (Fig. 3; Pig. 4). 11. The device according to claim 5 »characterized in that these wings (10 - 13) form a convex square * 309847/0817 232228Α 12. Yorrichtung according to claim 5 »gekennseichnet characterized in that these swings form a crossed square. 13. Yorrichtung according to any one of claims 8, 11 or 12, characterized »that these cylinder arrangements of the group are perpendicular to each other Bind (Pig. 3» Pig. 4). 309847/0817 Blank page