DE2532807B1 - Hydro-pneumatic pressure accumulator - Google Patents

Description

It is therefore the object of the invention to avoid these disadvantages in pressure accumulators of the type mentioned at the beginning, i. h, then execute this pressure accumulator that by relatively simple means, the housing halves can be clamped against each other so tightly that a breathing no longer takes place even at high pressures. The dimensions of conventional pressure accumulators should not be exceeded. The shapes of the housing halves should be simple, so that cheap, inexpensive production is given, also taking into account the necessary dies.

This object is achieved according to the invention in that the housing halves in their first Edge parts adjacent outer jacket areas with external threads in the same direction of inclination, however different pitch are provided and as a clamping device with corresponding internal threads provided clamping ring is provided, whereby the various external threads of the housing halves and / or the two internal threads of the clamping ring are separated from one another by a threadless zone.

The advantage of such a design is that with one rotation of the clamping ring, the housing halves, if they are prevented from turning, only the difference in the slopes relative to one another move. If the pitches of the individual threads z. B. be chosen with 3 mm and 4 mm, results a resulting slope of 1 mm. But that means a multiple for a given torque in terms of axial force or with constant axial force, a significant reduction in the required torque. Since the clamping ring can be tightened without relative rotation of the housing halves, the Possibility of axially preloading these with external forces, which further increases the required torque can decrease.

The invention is explained in more detail using an exemplary embodiment shown in the figure.

A pressure accumulator 1 has two housing halves 2 and 3. The housing half 2 has an external thread 4 in its edge region, while the housing half 3 is provided in its edge region with an external thread 5 of greater pitch. On the front side, the housing halves 2 and 3 have edge parts 6 and 7 in contact, at least in the final assembled state, which are adjoined further inwardly by second edge parts 8 and 9, between which a thickened edge 10 of a gas-tight, workable partition 11 is kept gas-tight. The partition 11 divides the interior of the accumulator 1 into a liquid space 12 and a gas space 13. A liquid connection 14 penetrating the housing half 2 opens into the liquid space 12 Screw plug 16 and a sealing ring 17 can be closed. The fluid connection 14

opposite st the partition 11 with a ScftGefSpfatte 1 * higher strength provided that a Squeezing out the partition 11 by the liquid attachment 14 prevents if ι the liquid space 12 has been emptied of liquid. Housing halves 2 and J 3 are axially compressed by a clamping ring 19. The clamping ring 19 has two by one Unthreaded zone 20 with separate internal threads 21 and 22, which correspond to external threads 4 and 5. > ö

To explain the assembly and pre-tensioning process, it is assumed that the threads 4 and 21 have a pitch of 3 mm and the threads 5 and 22 have a pitch of 4 mm and that all threads are right-hand threads. Under this condition, you can screw the housing half 2 into the clamping ring 19, for example, a little further than cfargestef.'t in the figure. The exact value icarm can be determined empirically as a function of the desired preload, the thickness of the edge 10 and the pitch of the thread. After this partial assembly, the partition 11 is suspended, its edge 10 being inserted into the edge portion 8. As the next step, the housing half 3 is screwed into the clamping ring 19 until a certain resistance can be felt. If the thread lengths are correctly dimensioned, the housing half 3 is now approximately? screwed in less than shown in the picture. The housing halves 2 and 3 are now fixed radially and the clamping ring is turned counterclockwise with a predetermined torque. Due to the different slopes, the axial relative movement between clamping ring 19 and housing half 3 is greater than between clamping ring 19 and housing half 2 Is moved towards the housing half 3, the amount of change in distance per revolution of the clamping ring corresponds to the difference in the thread pitches, ie 1 mm . It is clear that the order of assembly can also be different . It raging be taken, however, that the housing halves 2 and 3 are no longer turned when already contacted the partition H is the brim 10, as it can otherwise be easily destroyed. Appropriate * eise v- ird iir.r. only r, -jch the clamping ring 19 rotated

1 sheet of drawings

Claims (1)

Claim: • Hydro-pneumatic pressure accumulator with two housing halves enclosing a cavity, a connection opening for a pressure medium in one of the housing halves, a preferably closable gas filling opening in the other housing half, first edge parts on the front side of the circumference touching the housing halves, the first edge parts radially inwardly adjacent , for gas-tight fastening of the thickened edge of a workable partition wall serving second edge parts and clamping means for axially pressing the first edge parts against each other, characterized in that the housing halves (2, 5 and 3) in their outer shell areas adjacent to the first edge parts (6, 7) External threads (4, 5) of the same pitch direction but different pitch are provided and a clamping ring (19) provided with corresponding internal threads (21, 22) is provided as a clamping means, the different external threads (4, 5) of the housing halves (2,3) and / or both n internal threads (21, 22) of the clamping ring (19) are separated from one another by a threadless zone (20). * 5 The invention relates to a hydro-pneumatic view Pressure accumulator with two housing halves enclosing a cavity, a connection opening for a pressure medium in one of the housing halves, a preferably closable gas filling opening in the other half of the housing, on the front face on its periphery touching first edge parts on the Housing halves, adjacent to the first edge portions radially inward, for the gas-tight fastening of the thickened Second edge parts and tensioning means for the axial Press the first edge parts against each other. Such pressure accumulators have long been known in various embodiments. So shows z. B. US-PS 23 00 722 a pressure accumulator whose first edge portions are designed as flanges which are penetrated by a plurality of clamping screws and pressed against each other. In this design, however, there is the need for comparatively wide flanges, which are relatively more difficult to manufacture with high-strength materials. In addition, tightening a large number of screws is complex and expensive. Pressure accumulators of this type have therefore not been able to establish themselves in practice. Commonly used, however, are pressure accumulators in embodiments (z. B. US-PS 25 63 257) with a ring nut, which is provided with an internal thread, is screwed onto a corresponding external thread of a housing half, with an inward-facing edge on a circumferential shoulder of the other housing half comes to rest and so presses the housing halves against each other. It has now been shown that the housing halves tend to "breathe", especially at high pressures and dynamic loads. This means that the partition wall is also subject to changing stresses in its clamping area, which can lead to the destruction of the partition wall, especially when radial gaps occur. It is known that these disadvantages can be mitigated or even eliminated by bracing the housing parts against one another, but for this purpose it is necessary to apply very large axial forces. Since the thread for strength must not fall below a certain pitch, nothing remains other choice than to screw with very high torque, which can no longer be applied in circumstances with normal workshop equipment In addition, both the ring nut and the housing facilities must be created to handle these high torques z. To könnea ever transmitted as more than 1,000 MKP