DE2048647A1 - Pressure accumulator - Google Patents

Description

PATENT Attorney DIPL.-ING. HANS LANGOSCH

7OOO STUTTGART · HERDWEG 62 · TELEPHONE (Ο7Π) 296523

Depositor:

Firrna

Hanns Smmert & Co.

Apparatus construction

7022 Leinfelden / Württ.

Pressure accumulator

The invention relates to a housing composed of two parts Pressure accumulator, the interior of which is divided into two chambers by a membrane.

For use, for example, in motor vehicles Pressure accumulator known, the housing parts are screwed together via flanges. But that is connected with it a relatively high weight and, if the screw connection loosens, it also leaks.

209823/0117

The object of the invention is to provide a pressure accumulator create that is particularly light, the volume of which is optimally used and that is reliably leak-proof.

To solve this problem, the invention provides that the housing parts near the holder of the membrane are connected to each other by welding and the Weld seam against the interior is covered by a wall.

Covering the weld seam prevents that sioh particles can peel off during welding which the membrane suffers damage.

A destruction of the one lying very close to the weld seam Membrane during welding is avoided by welding by means of an electron beam is carried out, through which only a locally limited material heating occurs at high energy density.

The end faces of the housing parts are advantageous stepped according to each other and one step is from the wall to cover the weld seam. According to the invention, however, it can be fully utilized the strength of the material with the same wall thickness a special centering ring must be provided,

209823/0117

BATH

20Α8647

whereby the weld seam extends through the entire wall thickness of the housing components which are in contact in the weld seam through "extends into the centering ring, which is thereby welded on and fixed in its position.

The centering ring is first pressed in and used at the same time as a membrane holder, it is provided with a membrane guide surface to increase the service life of the membrane provided on which the diaphragm evenly changes when the filling ratios in the pressure accumulator change unrolls. The membrane guide surface is rounded inwards and has the shape of a circumferential channel.

Secure, firm tensioning of the membrane and, at the same time, easy centering of those that are joined together for welding Housing parts is achieved in that a housing part has a shoulder and the distance the shoulder from the weld seam corresponds approximately to the height of the centering ring. For secure anchoring can the centering ring also have cut-free, outwardly directed claws which are in the housing part with claw their edges.

Further details of the invention are based on the drawing, which shows an exemplary embodiment

• ι,

209823/0117

represents, explained in more detail. Show it:

Fig. 1 is a section through a pressure accumulator and

2 shows a detail of the bypassing of the weld seam of another embodiment on a larger scale.

In a composed of an upper housing part 1 and a lower housing part 2 pressure accumulator, a rubber-elastic membrane 3 is provided which divides the interior 4 into an upper chamber 5 and an un- _; tere chamber 6 divides.

The lower part 2 has approximately the shape of a circular truncated cone, at its lower end there is a connecting piece 7 attached for a pressure line through which a pressure medium, preferably pressure oil, flows in and out can. The membrane 3 rolls when the filling of the lower chamber 6 changes, so that no substantial Deformations and tensions arise in it and it thus achieves a particularly long service life.

The upper housing part 1 is flat and a filling screw 8 is screwed into a threaded hole 9 and sealed by a sealing ring 10, which is preferably made of copper. To my-

Ί I

209823/0117

! Penetration of a gaseous pressure medium, preferably Nitrogen, in the upper chamber 5 the filling screw is provided at its lower end with a groove 11 so that "With the filling screw 8 partially unscrewed, the upper chamber 5 can be filled. Depending on requirements this filling pressure can reach several hundred atmospheres.

The housing parts 1 and 2 are connected to one another in a gas-tight manner at their end faces 12 by welding. That Welding takes place in order to prevent damage to the membrane 3 arranged in the vicinity of the weld seam 13 to avoid the welding heat by a welding process in which the material to be welded only locally is brought narrowly limited to the melting temperature. In particular, this welding is carried out by electron beam welding. The welding depth is due to a corresponding bundling and a corresponding energy level of the electron beams used can be set. When welding, on the inside through out of the Weld 13, escaping gases, etc. Particles are entrained through which damage to the membrane 3 is to be feared. It is therefore provided according to the invention that the weld seam 13 is covered against the interior space 4 by a wall 14.

209823/01 17

According to Figure 1, a centering ring 15 is arranged for this purpose, which serves as a centering of the housing parts to be welded 1 and 2 and at the same time as a membrane holder 16 for clamping the on a shoulder 17 of the housing part with a circumferential bead 18 provided membrane 3 is used. For even rolling of the membrane 3 is the Membrane holder 16 is provided with a membrane guide surface 19 which is rounded inwardly in the shape of a circumferential Has gutter.

The centering ring 15 is by a corresponding oversize held elastically in the housing part 2. When welding, the penetration depth of the electron beam is set so that that he welds the housing parts 1 and 2 over their entire end face 12 up to the centering ring, so that the full material strength is used with the thinnest possible wall thickness. At the same time it will the centering ring 15 is specially welded on.

In another embodiment according to FIG. 2, which is particularly suitable for lower pressures, are End faces 12 of the housing parts 1 and 2 stepped according to one another, with one step facing the wall 14- Covering the weld seam 13 gives off. To fix the membrane 3, the membrane holder 16 is cut free Claws 20 provided, the edges 21 of which are directed outwardly dig into the housing part 2 and so one

209823/0117

Prevent displacement of the membrane holder 16.

The advantages achieved with the invention exist in particular in that a cheap to manufacture lightweight pressure accumulator was created that does not leak and has a long lifespan «

209823/0117

Claims (10)

Claims 1. / Pressure accumulator composed of two housing parts, the interior of which is divided into two chambers by a membrane, characterized in that the Housing parts (1, 2) in the vicinity of the holder (16) of the membrane. (3) connected to one another by welding are and the weld seam (13) against the Innenr & ua (4) is covered by a wall (14). 2. Memory according to claim 1, characterized in that the weld in the electron beam welding process is made 3. Memory according to claim 1, characterized in that the end faces (12) of the housing parts (1 and 2) a - <^ other are stepped accordingly and the one step gives the wall (14) to cover the weld seam (13). 4. Memory according to claim 1, characterized in that a special centering ring (15) is provided, the weld seam (13) extending into the centering ring (15) extends. 209823/01 17 5. Memory according to claim 4, characterized in that the centering ring (15) as a membrane holder (16)
serves. 6. Memory according to claim 4, characterized in that the centering ring (15) has a IJemTDranführungf lache (19). 7. Memory according to claim 6, characterized in that the Memlöranführungsf surface (19) is rounded inward and the shape of a circumferential groove
having. 8. Memory according to claim 5> characterized in that a housing part (2) has a shoulder (17) and the distance between the shoulder (17) and the weld seam (13) is approximately the height of the centering ring (15)
is equivalent to. 9. Memory according to claim 5, characterized in that the centering ring (15) by elastic bias is held in the housing part (2). 10. Memory according to claim 5, characterized in that that the hemhran holder (16) cut free, after has outwardly directed claws (20). 209823/0117 Lee side