DE1959253A1 - Actuating device working with a fluid - Google Patents

Description

PATENT Attorney DIPL.-ING. ULRICH KINKELIN 7032 Sinde! Fingen - Auf dem Goldberg-Weimarer Str. 32/34 - Telephone 07031/86501

November 25, 1969 10 965

Herga Electric Limited, Northern Way, Bury St. Edmunds, Suffolk / England

OPERATING DEVICE WORKING WITH A FLUIDUM

The invention relates to a fluid operating device with a the fluid containing chamber, with one between a first and a second Movable position, the volume of fluid in the chamber to a pressure in the fluid or changing it in response to an external force, thereby changing the pressure in the fluid Link, which link is unstable between the two positions.

It is known to bias the member in one of these positions so that the actuator apart from this one position is unstable. The preload can be generated by a spring acting on the member, which is a sliding element in a cylinder Piston can be. In this case the piston and the cylinder together form the chamber.

Such actuating devices are used in pairs and throw the ECanramsüT verbundsn by a line, whereby .das system with elmsrn Adbolföriblnoi

is filled. One of the actuating devices is arranged so that its member compresses the fluid in its chamber in response to an external force. One such actuator is called a "transmitter" and the other ^{actuator, called "slave 11} ", is arranged to move its member in response to an increase in pressure in the fluid of the transmitter. In this way, various operations can be performed from a remote location will,,

The problem with such systems is that the must apply external force, during which the taker should remain adjusted, because the spatially displaceable member of the encoder is biased so that it is in its one position wants to return. If the working fluid is air, there is a further difficulty that air can escape from the system if it is not completely airtight is. Then when the air pressure drops, the movable member of the taker can move into his return to stable position. Such operations can therefore be carried out over a long period of time do not perform in which the movable member of the taker for some time in his unstable situation should remain. If you wanted to get out of the way of the problem by if completely airtight systems are provided, this would result in a high level of precision in the Manufacturing and correspondingly higher prices mean.

According to the invention this problem is solved in that the Giied fst biased beyond a Zwischensrellung In a first position _ff that the member on this side of the ■ Zwtsdiensfeiüung 5n a zwelfe Sfeöung Is vorgespsKref and dsSdie Arste

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second position are stable positions. With such a system it is not necessary to to exert or guarantee an external force on the movable member for a longer period of time, that the system is completely airtight when air is used as the fluid. The system must only be airtight to the extent that the air pressure during that short period of time can be maintained in which the movable members of the actuators move between their stable positions. This is particularly advantageous there where the system is used in an environment the temperature of which changes. if If the system is not made completely airtight, changes in pressure can occur due to temperature changes can be avoided. Any overpressure that builds up in the system is compensated by a corresponding leakage behavior of the system.

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Further advantages and features of the invention emerge from the following description of a preferred embodiment. In the drawing show:

Fig. 1 shows a system according to an embodiment of the invention in one

its stable states,

Fig. 2 shows the system in an unstable state,

3 and 4 second and third exemplary embodiments of the invention, FIGS. 5 and 6 master and slave devices according to a fourth exemplary embodiment the invention.

The system according to FIGS. 1 and 2 comprises two similar actuating devices 2, 2 ' working with the aid of a fluid, each with a base plate 4, 4' in the form of a circular plate (e.g. made of plastic), in the center of which an axially extending sleeve 6, 6 'is formed. One end 8, 8 'of the sleeve is open while the other end 10, 10' is closed. Each circular plate also has a nipple 12, 12 ' _f which extends from the underside of the base plate 4, 4' through this upwards. Furthermore, a bore 14, 14 'is provided which extends through the base plate 4, 4' and the nipple 12.

A movable member in the form of a disc 16, 16 'with a smaller diameter than the base plate 4, 4' has an axially and centrally extending guide pin 18, 18 'which fits with a sliding fit in the sleeve 6, 6', the disc 16, 16 'axially towards the base plate 4, 4'". And can be moved away from it.

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A cylindrical button 20 is fastened to the disk 16 on the side opposite the guide pin 18. Each disk 16, 16 ⁷ has a circumferential groove 22, 22 '.

A hose 24, 24 'made of flexible material that is somewhat resilient, such as. B. PVC and which is corrugated in the longitudinal direction, has at one end 25, 25 'an approximately conical Shape and connects the disc 16, 16 'with the base plate 4, 4'. The scope the base plate 4, 4 'lies on the inside of a circumferential bulge 26, 26' of the Hose 24, 24 ', while the disc 16, 16' at its circumferential groove 22, 22 'of the Inside of a channel-shaped area 28, 28 'is encompassed. The dimensions of the Base plates 4, 4 'and the disks 16, 16' with regard to the circumferential bulges 26, 26 'and the channel-shaped areas 28, 28' is such that the material of the hose 24, 24 'is subject to tension in these areas. Has between the ends the hose 24, 24 'has a further bulge 30, 30' and a further channel 32, 32 '. The base plate 4, 4 ', the disk 16, 16' and the hose 24, 24 'delimit one Chamber for an operating fluid, which in this case is air.

The resilience of the hose 24, 24 'tensions the disc 16, 16' in both End positions before and makes them positionally unstable when they occupy an intermediate position. 1 shows the disk 16 in an end position in which it is removed from the base plate 4 and shows the disc 16 'in its opposite end position in which it is close to the base plate 4 '. By pressing button 20 and thereby causing the disk 16 moves from its one position to the other, one causes that with the aid of the air in the system, the disk 16 'from the one position is moved to the other. The nipples 12, 12 'are thereby through a flexible tube

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34 connected so that the actuating device 2 is a bellows sensor and the actuating device 2 'form a bellows taker. In operation, the disc 16 'actuates the mechanism which is intended to be actuated from a remote location in the system. The mechanism can be, for example, a microswitch or an electrical contact.

By moving the disc 16 from its position shown in FIG. 1 to its other position moves, the bulge 30 folds and forces the bulge 30 outward. the Stress in the material in. The area of the bulge 30 is such that initially the disk 16 wants to return to its position shown in FIG. However, if the washer 16 is moved further, then it crosses an "off-center" area and the Bulge 30 then begins to contract so that the disc 16 against the Base plate 4 is pushed and has the aim of the position of the parts of the Betägigungsvorrichtung 2 'according to FIG. The intermediate position of the disks 16, 16 ', in which they are unstable, is shown in FIG. 2, while FIG. 1 shows its one stable position and shows the disc 16 'in the opposite stable position, with the hose 24 'of the actuator 2' is folded over itself on the bulge 30 '. The corrugated, bellows-like shape of the SchJouchs 24, 24 'ensures that it is not in can collapse when there is reduced pressure inside. this applies in particular to the hose 24 'when the disk 16' due to negative pressure in the Hose 24 'is pulled into the position shown in FIG. In other words, it represents the wavy shape ensures that the tube folds in the desired area.

The sleeves 6, 6 'and guide pins 18, 18' only serve as guides that ensure that the base plate 4, 4 'and the disk 16, 16' are parallel to each other

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stay. In principle, however, it would be possible to dispense with this guide device.

In testing the illustrated device, it has been found that the relative dimensions of the hose 24, 24 ', the base plate 4, 4' and the washers 16, 16 'must be carefully selected in order for a reliable snap action to occur. These dimensions can be found through experiments. a

Because the hose 24, 24 'moves the disc 16, 16' into one or the other of its two positions snap, you only need pressure in the system when the disc 16 is actually moved from one position to the other, thereby causing is that the disc 16 'moves outward. Therefore, if z. B, the plate 16 ' connected to an electrical switch, then it is not necessary to apply pressure in the actuator 2 or 2 'maintain while the switch is either is in its "on" or "off" position. It is therefore not necessary to use the Actuators 2.2 'and the junction between the tube 34 and the To design nipples 12, 12 'absolutely airtight, it being assumed, of course, that the pressure in the system can be maintained for such a period of time that sufficient to cause the disc 16 'to snap from one position to the other. It will even be preferable if the system is based on the pressure of the environment remains when the ambient temperature or pressure increases, with the compensation being provided by leakage flows. For this purpose, you can use a pressure equalization

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Provide opening.

In the system of FIG. 3, a pair of similar actuating devices 50, 50 'are provided. Every? comprises a housing 52, 52 ' which is circular in plan view, has a cup-shaped recess 54, 54 " and a circular spring plate 56, 56', the edges of which sit in annular grooves 58, 58 '. The spring plate 56, 56' is bulged and the housing 52, 52 ' and the spring plate 56, 56 ⁷ thereby together form a chamber for working fluid, which in this case is again air. The spring plate 56 carries a button 59 with which it can be brought into an outer position by hand in which the working chamber is enlarged and with which it can be brought into an inner position by reducing the working chamber The actuating device 50 is shown in a position in which the spring plate 56 is in its outer position and the spring plate 56 'of the actuating device 50 'assumes its inner position. The spring plate 56, 56' therefore represents a wall of a working chamber, which is movable and, because of its spring properties, is pretensioned in both positions is unstable in these positions.

The working chamber of each actuator 50, 50 'communicates with a nipple 60, 60 ', with an inward and outward movement of the spring plate 56 causing an outward movement and inward movement of the spring plate 56 caused by pressure or negative pressure, respectively. The actuating device 50 is therefore the transmitter and the actuating device 50 ' is the taker. In operation, the spring plate 56 'acts on the mechanism to be actuated

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nism. The housing and the spring plates can be made of plastic or, for example Be rubber.

In FIG. 4, the parts corresponding to FIG. 3 have the same reference numbers. The working chamber thereby becomes individual bellows 62, 62VgObUdBt which are mounted in a housing 64, 64 'and which can be compressed by moving a spring plate 66, 66 from its outer to an inner position. The two bellows 62 _Λ 62 'have an end wall area which is connected to the spring plate 66, 66 at 63, 63', for example by glue or welding, which ensures that the end wall area is moved together with the spring plate 66, 66 ' can. The spring plate 66, 66 'is bulged so that the required snap action or preload occurs in the inner and outer positions and there is instability between the two positions. The interior of the housing 64, 64 'is in communication with the environment via an opening 68, 68'.

According to FIG. 5, the actuating device serving as a transmitter is provided in a plastic housing 70 which from the outside looks like a light switch common in apartments and has a rigid base plate 72 and a wall 74 which together form a working chamber. The wall 74 is circular as seen in the direction of the arrow A and has an edge 76 which sits in a groove 78 in the base plate 72. A lever 80 is pivotally mounted in an opening of the plastic housing 70 in the manner of a conventional electric light switch and is connected by one end to the center of the wall 74 by a pin 82

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tied together. The wall 74 is flexible so that it can be changed in position by the lever 80 is pivoted. The wall 74 is resilient and can be inserted into the interior shown Position and be brought into an outer position in which it is biased. the Wall 74 is stable between these two positions and therefore shows a snap behavior.

The base plate 72 has a nipple 84 which is connected via a suitable conduit to a slave actuator can be connected, with which you can operate a light switch.

One suitable form of slave actuator is shown in FIG. It is similar to the transmitter actuation device and equivalent parts have the same reference number, which has also been provided with a prime. The slave actuator is located in a housing 90 which contains electrical terminals 92 to which the ends of electrical conductors can be connected. Further, located in the housing 90 two fixed electrical contacts 94 which are insulated from each other, | edoch electrically with the corresponding A- hlußklemmen 92 are connected. However, the flow of current between the two contacts 94 can be closed by a movable contact that is carried by the center of the wall 74 'and arranged so as ₇ when the wall is in its FIG. 6 outer position 74, the circuit is closed while the circuit is broken when the wall 74 'is in its inboard position.

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A pin 98 in wall 74 ' serves as a guide for the movement of the wall and slides in a bore that leads to nipple 84'.

Therefore, when the master and slave actuators of Figs are connected, the connection between the contacts 94, 96 can be interrupted or by operating the lever 80 with your finger.

Although in the illustrated embodiments, the actuating device a has flexible wall, which is a bellows or a membrane, the invention can also be applied to other actuating devices that have pistons and cylinders or in which an immersion member in a working chamber is inwardly and can be moved outwards.

The invention can also work with other working fluids than air, such as. B. with Liquids.

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Claims (11)

10965 Claims Actuating device working with a fluid, with a das Chamber containing fluid, with a movable between a first and a second position, the volume of the fluid in the chamber in response to a pressure in the fluid or in response to an external force, and thereby changing the pressure in the fluid, which limb is unstable between the two positions, characterized in that that the link (16,56,62,74) on the other side of an intermediate position is biased into a first position, that the link on this side of the intermediate position is biased to a second position and that the first and second positions are stable positions. 2. Actuating device according to claim 1, characterized in that ^ the member (56, 74) is a wall of the chamber and that the chamber is flexible is and so the movement is allowed and is resilient to generate the preload. 3. Actuating device according to claim 2, characterized in that the resilient flexible wall has the shape of a spring plate (56), that the spring plate is mounted in a housing (52) and that the spring plate and the housing form the chamber. 009-828 / 1035 4. Actuating device according to claim 1, characterized in that the member (16) is carried by a wall (24) of the chamber that the The wall (24) of the chamber is flexible in a manner permitting movement and that the wall is resilient in a manner which generates the prestress is. 5. Actuating device according to claim 4, characterized in that the wall (24) is tubular, that the direction of movement of the member (16) is axial to the wall (24) and that the wall is bellows-like during movement folds together and apart. 6. Actuating device according to claim 5, characterized in that the wall (24) is corrugated in relation to the longitudinal section and that the member (16) is held in a channel-shaped region (28) of the wall (24). 7. Actuating device according to claim 5 or 6, characterized in that that the adjustable member has a guide device (6,18). 8. Actuating device according to claim 1, characterized in that the member (62) is a wall of the chamber that the chamber is in a die Movement permitting manner is flexible and that a bulged spring (66) connected to the flexible wall (62) generates the preload. 0 09828/103 5 9 “Actuating device according to one of the preceding claims, characterized characterized in that the member outside the chamber has an external force-absorbing button (20,59). 10. Actuating device according to claim 1 - 8, characterized in that that the movable member is connected to a manually operable lever (80). 11. Actuating device according to one of the preceding claims, characterized characterized in that the fluid is air. 009828/1035