EP1354139B1 - Hydraulic accumulator, especially bladder accumulator - Google Patents

Abstract

A hydraulic accumulator, especially a bladder accumulator, includes an accumulator housing (10), and a separation element disposed in and separating the accumulator housing interior into a gas chamber (16) adjoining an inlet (14) on the gas side from a fluid chamber (18) adjoining an inlet (20) on the fluid side. The inlet on the fluid side has a fluid connecting neck (22) having a valve support (40) disposed in the neck. The valve support has fluid openings (42), and a disk-shaped valve body (32) that tapers towards the valve shaft (46) on its side facing the valve support (40). The valve shaft can be pretensioned via a force accumulator (62) into the open position releasing the fluid opening, can be displaced into its closed position by a displacement of the separation element (12), and projects into the fluid chamber (18) in the open position. The valve body (32) is an integral, especially one-piece, component of the valve support (40) that is guided along its outer periphery (56) within the connecting neck (22) so as to be displaceable in it, creating a hydraulic accumulator that is comparatively simple and inexpensive in production.

Description

The invention relates to a hydraulic accumulator, in particular bladder accumulator, with the features of the preamble of claim 1.

Hydraulic accumulators of this type are commercially available. In one of the company Mannesmann Rexroth edited textbook "The Hydraulic Trainer", Bd.1, on page 165 a bubble memory of the type mentioned is shown and described. In the known bladder accumulator is the valve assembly designed as a seat valve, wherein on the fluid space facing End edge of the connecting piece as a fixed valve seat a conical surface is formed, which with a corresponding conical surface on a valve plate the movable valve body cooperates. This is similar designed as the usual in valve-controlled internal combustion engines Control valves, i. the valve disk is located on a shaft which is suitable for the between the open position and closed position extending valve lift is guided in a valve guide as a valve carrier, which is part of the Connecting piece is.

The disadvantage here is the resulting high production costs due the required effort for the production and processing the condition of this valve design variety of items. To ensure proper operation of the valve assembly, must be installed in the connection piece valve guide with respect to Manufacturing tolerances both in terms of alignment and the fit be carefully designed. In addition, a corresponding processing of the valve seat forming conical surfaces required, which also the manufacturing costs increases as the fact that at least the valve disc of the valve body manufactured in forged construction.

By DE-A-199 06 800 a pressure fluid accumulator (hydraulic accumulator) known with a housing, whose interior through a media-separating element is divided into two chambers, the first chamber with a gas and the second chamber is filled with a liquid and wherein a bottom valve is provided in a hydraulic connection, whose closing body by the media-separating element in the form of a Actuating plate of a bellows is actuated and filling the second chamber with liquid allows and complete emptying prevents the second chamber.

To both a damage to the bottom valve and an unwanted Prevent fluid leakage and thus a significant increase to ensure functional reliability is proposed in the known solution, that the closing body through the media-separating element in a position can be brought, in which fulfills the function of a hydraulic piston is. The closing body has on its part of the separation plate of Federbalgspeichers facing a spherical actuating part on, so that in this respect a selective force peaks having force on the media separation element takes place on the closing body. The complete in the connecting piece guided known valve body needs about In addition, for its sealing against the connecting piece outside circumference rubber-elastic sealing devices, basically a Wear is subject, so this from time to time to the functional safety of the hydraulic accumulator to exchange for new ones are.

By FR 1 154 187 is a generic hydraulic accumulator, in particular Bladder accumulator, known with a storage enclosure, one in this arranged separating element, the one in the storage enclosure to a gas-side access separates adjacent gas space from a fluid space, which adjoins a fluid-side access, which fluidly Anschlut having, located in the connection piece valve carrier with fluid passage and with a plate-like, on its the valve carrier facing side to the valve stem towards tapered valve body, the on a power storage in the form of a compression spring in his the Fluid passage releasing open position biased and by a movement the separating element is movable into its closed position and the protrudes into said fluid space in said open position, wherein the valve body is integral, in particular integral part of the valve carrier, the along its outer circumference within the connecting piece in this is guided longitudinally movable. To limit the travel is the Valve carrier moved against a stop in the connecting piece, which consists of a circlip. In the known solution the valve carrier has only one fluid passage in the axial direction, the in a radially extending fluid passage in the manner of a in the valve body attached transverse bore opens, wherein the axially erstrekkende Fluid passage in the rest of the energy storage in the form of the compression spring is penetrated. The known solution builds complicated on, which increases the manufacturing costs and the reliability accordingly impaired.

By GB 2 104 964 a further hydraulic accumulator solution is known especially in the form of a bladder accumulator, which is not is a valve plate solution with valve carrier in the indicated sense, but rather a piston valve solution in which the piston is used as a valve carrier should have the largest possible diameter opposite its installation length, so as to increase the rigidity of the closing valve, to the disadvantage of the known valve disc solutions with slim trained valve stem to meet in the overload range on the Pressure side of the memory of the valve plate in the valve seat in the form of Unintentionally pressed in connection piece (page 1, lines 102 - 108 GB 2 104 964). To simplify the assembly in the known To achieve a solution, it is provided that the tapered end part the carrier piston is detachably connected to this, for example with Help of a screw connection. Although omitted the known solution a circlip and the piston-like valve body is known in this Solution via a stop of the connecting piece in the same kept safe; however, in contrast to the above French Font of the energy storage in the form of the compression spring below the valve body arranged. The solution known in turn also has only one fluid passage in the axial direction in the valve body, in the radial Fluid passage points in the piston-like valve body opens. Also the To this end known solution is also complex and expensive in the Production.

By US 4,335,751 a diaphragm accumulator is known as a hydraulic accumulator, in which in the connecting piece for fluid guidance a fluid guide part screwed diametrically to its longitudinal axis with multiple fluid passages is provided. On its upper side, the fluid guide part a plate-like guide surface, the flow diversion of the fluid from the fluid passages to the fluid side of the hydraulic accumulator makes. The pertinent fluid guide surface is immovable integral part of the set in the connection piece of the diaphragm storage fluid guide part. The outer diameter of the guide surface is chosen such that that from the side of the connecting piece ago a screwing possible is, so that the guide surface is not od in the manner of a valve. Like. The marginal boundary surfaces of the connecting piece to the interior of the Memory can spill over. With the static arrangement A fluid guide part can also already be due to the geometric Dimensions of the plate-like guide surface a valve function, as in the solutions described above, even after appropriate modification thus not perceive.

The invention is based on this prior art, the task To create a hydraulic accumulator that comparatively easy and is inexpensive to produce while increased reliability and has the maintenance intervals at longer intervals.

In a hydraulic accumulator of the type mentioned, this object is according to the invention achieved in that a plurality of fluid passages in the form of longitudinal bores in the valve carrier diametrically to its longitudinal axis and to the longitudinal axis the valve body are arranged opposite to each other, that the Fluid passages bounded inwardly by the valve stem of the valve body are that the energy storage below the piston-like valve body is arranged between this and the connecting piece and that the valve body with valve carrier in machining machining as a turned part is designed.

By eliminating a separate, to be installed in the connection piece valve construction results in a significant reduction in the cost of manufacturing, processing and assembly. With the solution according to the invention, it is possible to form the valve body as part of the valve carrier in the manner of an insert module and the pertinent module component can be introduced quickly and easily into the fluid port and set there longitudinally movable. With regard to the modular structure, adaptations to changed proportions, in particular with regard to the connecting piece, for the hydraulic accumulator can be made quickly and easily in the manner of a modular system. Furthermore, can constructively simple and inexpensive to provide the required number of fluid passages in the form of longitudinal bores in the valve carrier.
The arrangement of the energy storage also supports the modular structure of the solution and the energy storage can be inserted in a simple, cost-effective manner in the connection piece.
Since the valve body is designed with a valve carrier in machining machining as a rotating part, the valve device of the invention can be realized from a rod-shaped base material by means of conventional lathes in a very cost-effective manner, the hitherto commonly used forging process for the valve disc bring a significant increase in costs.

Since the valve carrier on the outer peripheral side along the inner circumference of the Runs connecting piece, can thus increase the guide surface, so that a secure snug fit guide is reached, what the reliability the solution of the invention increases. Furthermore, can completely dispensed with a subject to wear sealing system become.

Due to the plate-like configuration of the valve body is a flat Plant of said separation element, so that in so far gentle Way a two-dimensional operation takes place, which is also the wear helps reduce and thus the reliability of the invention Hydrospeicher solution benefits.

The retaining ring of the hydraulic accumulator according to the invention can be over a mounting groove on the outer circumference of the valve carrier safely into the recess bring in the connection piece, so that with a simple Verrastungsvorgang against the action of the compression spring in a single operation the assembly of the insert module can be completely carried out. Preferably is the distance between the stop and the end outlet the mounting groove in particular sized larger than the free travel the valve body from the maximum possible open position up to its full closed position to later a non-stop operation reach the valve body with valve carrier and allow installation.

Fig.1

teilweise in Ansicht, teilweise im Längsschnitt gezeichnet einen bekannten Hydrospeicher in Form eines Blasenspeichers;

Fig.2

in perspektivischer Ansicht einen Schnitt durch die Ventileinrichtung nach der Erfindung mit Anschlußstutzen;

Fig.3

einen entsprechenden Längsschnitt gemäß der Darstellung der Anordnung nach der Fig.2.

In the following, the hydraulic accumulator according to the invention will be explained in more detail with reference to an embodiment according to the drawing. It shows in principle and not to scale representation of the

Fig.1

partly in view, partly in longitudinal section drawn a known hydraulic accumulator in the form of a bladder accumulator;

Fig.2

in a perspective view a section through the valve device according to the invention with connection piece;

Figure 3

a corresponding longitudinal section according to the illustration of the arrangement according to the Fig.2.

FIG. 1 shows a conventional bladder accumulator which can be detected in the prior art with a storage housing designed as a pressure housing 10. In the storage housing 10 is an elastically resilient separating element 12, which is adjacent to a gas-side access 14 Gas space 16 separates from a fluid space 18, the to a fluid-side access 20 adjacent. Said fluid-side access 20 has a fluid connection pipe 22, which is formed in the manner of a hollow cylinder. In Viewing viewed in Fig.1, the connecting piece 22 at its lower inside a connection point 24 with internal thread, to the a fluid line can be connected. At its opposite end the connecting piece 22 has a widening 26, the inner peripheral side is provided with a Anlageschräge 28 for the plant of the lower Tellerrandes 30 of a valve body 32 in its closed position (not shown). For fixing the fluid connecting piece 22 at the lower open End of the storage enclosure 10 serve Festlegeringe 34, once inside the storage enclosure 10 are arranged and once as shown after Fig.1 outside. For the tension of the festoon rings 34 against each other in order to set the connecting piece 22 at the bottom Memory housing edge serves a lock nut 36, which on an external thread 38 of the connecting piece 22 can be screwed.

In the middle of the connecting piece 22 in the region of the fluid-carrying part of the hydraulic accumulator is a valve carrier 40 with diametrically opposed Fluid passages 42 arranged. The pertinent fluid passages 42 connect the connection point 24 fluidly leading to the fluid space 18 of the hydraulic accumulator. The valve carrier 40 is along the central longitudinal axis 44 provided with a central bore through which a valve stem 46 of the plate-like valve body 32 engages, wherein, like the Representation according to the Fig.1 shows, the free end of the valve stem 46 with a screw 48 is provided. Between the lower end of the actual valve disc 50 of the valve body 32 and an upper stop surface of the valve carrier 40, a force accumulator extends in shape a compression spring 52. The pertinent energy storage 52 biases the valve body 32 as shown in FIG. 1 in its fluid passage releasing open position and by a movement of the separating element 12 in the direction of the fluid-side access 20 passes the valve body 32 in its closed position, in which the plate edge 30 of the valve body 32 in sealing engagement with the abutment 28 of the fluid connection piece 22 device. Furthermore, 54 is in usual over sealing points and therefore not described in detail a fluid-tight Securing the interior of the storage enclosure 10 from the environment achieved in the region of the connecting piece 22.

The pertinent structure for a hydraulic accumulator is common and state of the art Technology. From the above it is clear that the manufacturing costs for the connecting piece 22 with integrated valve carrier 40th and fixing the valve body 32 to the valve carrier 40 via the Screw 48 is considerably, resulting in high production costs. Furthermore contributes to the high production costs in that at least the valve disk 50 of the valve body 32 is designed as a forging component. In contrast, should with the inventive solution as shown 2 and 3 a cost-effective implementation can be achieved, wherein for the explanation of the invention the same reference numerals as above described for which components are used, provided they are according to their function.

In the solution according to the invention, the valve body 32 is integral, in particular integral part of the valve carrier 40, which along its Outer circumference 56 within the connecting piece 22 in this longitudinally movable is guided. To guide the piston-like valve carrier 40 along of the connection piece 22 both components have accordingly trained cylindrical guide surfaces, which inhibits a traversing movement allow. The construction dimensions for the valve carrier 40 are such such that the height is comparable to its diameter, the dimensions thus selected are safe and straightforward Ensure leadership. In the solution according to the invention are four fluid passages 42 (see Fig.2) in the valve carrier 40 diametrically to its longitudinal axis 44 and thus to the longitudinal axis of the valve body 32 opposite each other arranged. Outwardly, the said fluid passages 42 bounded by the outer wall of the valve carrier 40, wherein the remaining Residual wall thickness, as the illustrations show, only small dimensioned is. Inwardly, the fluid passages 42 are through the valve stem 46 limited, the one-piece in the other body of the valve body 40 passes.

In the inventive solution of the energy storage 52 in the form of a Compression spring arranged below the piston-like valve carrier 40, wherein the compression spring with its one lower end on the connecting piece 22nd supported and with its other, opposite end on the valve carrier 40. For the support of the compression spring 52 at its lower end, the Connecting piece 22 an inwardly projecting abutment shoulder 58 and at its upper end, the compression spring 52 is supported on the ring boundary wall 60 of the valve carrier 40, so that the four fluid passages 42 in the direction of the connection point 24 for the fluid connection (not shown) are kept free.

In the maximum possible open position of the shown in Figs.2 and 3 Valve body 32 abuts the valve carrier 40 against a stop 62 in the connection piece 22, so that the travel of the valve carrier 40 upwards is limited by this stop 62. In the full closed position (not shown) of the valve body 32 is the lower plate edge 30th at the contact angle 28 of the connecting piece 22 at. In this closed position is the fluid passage from the fluid space 18 in the direction of the connection point 24 blocked via the fluid passages 42 in the form of longitudinal bores. The stop 62 is formed by a retaining ring 64, which in the Art a conventional snap ring is formed. In the installation situation, the pertinent, annular resiliently resilient locking ring 64 in a semicircular recess 66 on the inner circumference 68 of the connection piece 22 on.

For making the pertinent connection, the locking ring 64th initially via a mounting groove 70, which is annular along the outer periphery 72 of the valve carrier 40 extends into this outside of the connecting piece 22 used. After inserting the compression spring 52 in the interior of the Connecting piece 22 can then be the valve carrier 40 with valve body 32nd and retaining ring 64 against the action of the compression spring 52 in so long Insert the connecting piece 22 until the mounting groove 70 with the retaining ring 64 in height of the recess 66 on the inner circumference 68 of the connection piece 22 arrives. Due to the inherent elasticity of the then snaps Circlip 64 outwardly into the recess 66 and forms such captive then the stop 62. In the pertinent installation situation Then the valve unit is safe within the connecting piece 22nd fixed and in the maximum possible open position presses the compression spring 52 the valve carrier 40 against the stop 62, so that captive such the valve carrier 40 is held in the connecting piece 22. The free Distance between stop 62 and the end outlet of the mounting groove In any case, 70 is chosen larger than the free travel of the valve body 32 of the maximum possible open position shown up to his full closed position, in which the plate edge 30 of the valve body 32 is in abutment with the abutment 28 at the upper free end of the Connecting piece 22. Due to the inherent elasticity of the retaining ring 64th There is also no risk that this in the mounting groove 70th could spring back.

The valve carrier 40 with valve body 32 and thus with the valve disk 50 is a so-called. Rotary part by machining on conventional lathe machines to obtain. The resulting machining is compared to the usual production pronounced as forging inexpensive. The fluid passages 42 in the valve carrier 40 are in the form of Single holes realized on the opposite side of the Valve plate 50 are introduced into the valve carrier 40. The circlip 64 can be in the usual way by access through the fluid passages Remove 42 from the recess 66 on the connecting piece 22, so that extent the valve assembly as a modular component readily against a new one can be replaced if a repair od. Like. Necessary should be. The described solution according to the invention leaves Produce very cheaply and easy to assemble, which clearly the Production costs for hydraulic accumulator lowers. The described use the valve system unit according to the invention is not on bubble memory as Limited hydraulic accumulator, but can, for example, in piston accumulators Find application in which the separator 12 from a Separating piston (not shown) is formed.

Claims (5)

1. Hydro storage tank, in particular a bladder storage tank, with a storage tank housing 10, a separation element located within this and which in the storage tank housing separates a gas section (16) adjoining an inlet on the gas side from a fluid section (18) which adjoins an inlet (20) on the fluid side, which has a fluid connecting piece (22) and with a piston-type valve support (40) located within the connecting piece (22) with at least one fluid passage (42) and with a plate-like valve unit (32) which tapers towards the valve shaft (46) on its side which is facing the valve support (40), which by means of a power storage unit (52) is pre-tensioned into its open position which releases the fluid passage, and can be moved by means of a movement of the separation element (12) into its closed position, and which in the said open position extends into the fluid section (18), whereby in the maximum possible open position of the valve unit (32) the valve support (40) strikes a stop (62) in the form of a retaining ring (64) in the connecting piece (22), whereby in the fully closed position of the valve unit (32) the same is in contact with the connecting piece (22) at least with its plate edge (30), and whereby the valve unit (32) is an integral, in particular one-piece component part of the valve support (40), which is manoeuvrable lengthwise along its outer circumference (56) within the connecting piece (22), characterised in that several fluid passages (42) in the form of lengthwise bore holes in the valve support (40) are positioned opposite to one another diametrically to its long axis (44) and to the long axis (44) of the valve unit (32), that the fluid passages (42) are limited inwardly by the valve shaft (46) of the valve unit (32), that the power storage unit (52) is located beneath the piston-type valve support (40) between the same and the connecting piece (22), and that the valve unit (32) with the valve support (40) is produced as a turning workpiece by machining.
2. Hydro storage tank in accordance with claim 1, characterised in that the power storage unit (52) in the form of a pressure spring supports itself by its one end on the connecting piece (22) and by its other end on the valve support (40).
3. Hydro storage tank in accordance with claim 1 or 2, characterised in that the retaining ring (64) engages in a recess (66) on the inner circumference (68) of the connecting piece (22).
4. Hydro storage tank in accordance with claim 3, characterised in that the retaining ring (64) is positioned in the recess (66) on the connecting piece (22) by means of an assembly nut (70) on the outer circumference (72) of the valve support (40).
5. Hydro storage tank in accordance with claim 4, characterised in that the distance between the stop (62) and the projection on the end side of the assembly nut (70) is greater than the free manoeuvring path of the valve unit (32) from the maximum possible open position to its fully closed position when the valve unit (32) is fitted in the connecting piece (22).

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