DE2239618A1 - PULSE DAMPER FOR HYDRAULIC SYSTEM - Google Patents

Description

21,233 / ki

Jacques Henri MERCIER, Paris 8, 49 rue de Naples

'Impulse damper for hydraulic system'

The invention relates to a pulse damper for hydraulic systems with a rigid envelope, which has two opposite openings comprises, a first and a second connection, each in said Openings are mounted to connect the damper to the hydraulic system, an elastic separator in the form of a bladder with two Openings which are correspondingly connected to said connections, said separator in said shell having an inner space and forms an outer space with variable volumes, a pipe with a longitudinal passage for the mutual connection of the said connections and a lateral permeable wall serving to connect said passage to said interior space and a third fluid communication under pressure on the envelope, which is in communication with said external space, in order to effect the damping of the impulses.

The known dampers of this type generally have a sensitive one Design and are unsatisfactory if the pulses have a high frequency, for example one with more than 60 Hertz.

The object of the invention is to provide a pulse damper without these disadvantages to create, the construction of which is particularly robust and comfortable, with

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this damper should also make it possible to generate high-frequency pulses absorb, for example in the range of 300 to 400 Hertz.

According to the invention is a pulse damper for hydraulic systems in particular characterized in that at least one of the ends of the tube is movably mounted.

Thanks to this arrangement, a very solid construction is obtained in a simple manner, which is not very sensitive to stretching effects.

According to another feature, there is a diverter in the longitudinal passage of the Tube arranged to form a resistance there, so that the mutual The two connections are connected via the permeable side wall or via the interior.

Preferably said discharge member has one in this passage adjustable axial position. Thanks to this arrangement, the said organ can be placed anywhere, either in the middle of the tube, or else at a point offset from the center with the. Aim different To achieve load losses above and below, which means harmonic frequencies and, accordingly, resonance of the system avoids.

Preferably said mouths of the separator are fixedly mounted on a first and a second rigid sleeve mounted in the first and the second connection respectively, said tube being axially movable with its second end inside and at the same time in contact with the second socket, while the first end of the pipe and the first socket in the first connection are arranged one after the other. ₍

In one embodiment, the side wall of the tube is perforated and covered with a stack of slices.

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In a preferred embodiment, each connection is in the corresponding The mouth of the envelope is introduced with seals that have two separate sealing elements, so that the seal is maintained is obtained regardless of the state of elongation of the envelope.

For the needs of the assembly, one can advantageously see the Separator in at least two parts, each with two mouths are provided and which are connected to each other. This assembly can in particular are carried out by gluing, adhesion, etc.

The third connection may be a compressible substance injection valve exist, for example nitrogen or be connected to a liquid compartment of a pressure accumulator.

Further features and advantages of the invention emerge from the following Description of an exemplary embodiment illustrated in the accompanying schematic drawings. Herein is:

Fig. 1 is a longitudinal section of a pulse damper according to the invention,

2 shows a view on a larger scale of the said damper cut and approximated parts, in particular the assembly at the connections is shown.

In the embodiment It. Fig. 1 and 2 has a pulse damper for hydraulic system (Fig. 1) a rigid envelope 10 in the overall shape of an elongated, cylindrical bottle with two hemispherical ends on where a first opening 11a and a second opening 11b of the same diameter are provided. Said two openings 11a and 11b are arranged opposite one another and axially in a line.

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A first and a second "connection 12a and 12b" are in the aforesaid Openings 11a and 11b mounted to connect the damper to the system. In the example of Figures 1 and 2, the connections 11a and 11b are internally threaded at 13 to connect the damper to the lines, which belong to the system and are not shown in the drawings.

Each connection 12a or 12b is in the corresponding opening 11a or 11b is mounted with a rigid ring 14, which is diametrically split and connected to a continuous elastic ring 15 in a force-locking manner is. Thanks to the diametrical gap in the ring 14, the unit 14, 15 by bending them into opening 11a or 11b, whereby the overall assembly with the ring 14 is supported at 16 on the inside of the bottle around the opening by unfolding. The connection 12a or 12b, which was previously introduced into the interior of the bottle 10, is then led outwards, being pushed into the ring 14 at 17, until a neck 18 of the connection strikes the ring 16 at 19.

The connection 12a or 12b is centered at 17 and at 19, 16 in the Detained from the outside direction. In the inner direction, it is held by a nut 20 which is attached to an external thread 21 of the connection mentioned is screwed and which has a ring 22 against the bottle presses. The fixed connection of the connection with the bottle takes place in this way completely in all directions.

The connection 12a or 12b is in the corresponding opening 11a or Ub mounted with sealing means having two separate toroidal connections 23 and 24. The seal 23 is on the one hand radially between the Bottle and the connection inserted and on the other hand axially between an inclined support 2 5 of the ring and a disk 26 next to the ring 14.

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The seal 24 is inserted into a groove 27 of the ring 22 and is supported axially on a flat support 28 around the opening 11a and 11b.

Independent of the expansion states of the bottle and the other parts is the tightness in the axial direction by the seal 23 thanks to the inclined support 25 and in the radial direction by the seal 24 thanks to the flat support 28 ensured.

An elastic separator 30, for example made of stretchable material, has the overall shape of a bladder and extends inside the rigid envelope 10, where there is an "inner space 31 and an outer space 32 with variable Delimits volumes. A third pressure connection 33 is connected to the envelope 10 and is connected to the. Outer space 32 for the damping the impulses in connection. In the example shown, there is the third Connection from a gas injection valve 33 for introduction and maintenance of the gas pressure in the outer space 32. As a variant, the connection 33 can be connected to a liquid space of a pressure accumulator will.

The elastic separator in the form of a bladder 30 has a first mouth 34a and a second 34b that are opposite and axially in line are arranged. The mouths 34a and 34b are connected to the first connection 12a and to the second connection 12b. The separator 30 is in two parts 30a and 30b are provided, which with two mouths 34a and 34b and which are connected to one another at 30c. These Assembly can advantageously be carried out by gluing or adhesion, using an inclined assembly line, as shown in FIG. 1 became.

The mouth 34a receives a stiff ring 35a, which is a reinforcement forms and has an L-shaped cross-section and is maintained in the same way

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the mouth 34b an annular stiffener 35b analogous thereto. Part 30a of the separator 30 is cast with the stiffener 35a, while the part 30b is also cast with the reinforcement 35b.

The reinforcement 35a or 35b is centered around a smooth, cylindrical one Receptacle 36 of a sleeve 37a or 37b is applied, which has a thread 38 on the outside of the support 36 which is suitable for inserting into the threaded bore 13 to be screwed in and on the inside of the support 36 a flat shoulder 39 and then a fold 40 and a conical support 41.

The reinforcement 35a or 35b, centered at 36, is axially on the sleeve 37a or 37b held in abutment against the shoulder 39 with a clip 42. It will be noted that the mouth 34a or 34b between the reinforcement 35a or 35b and the fold 40 is constrained. If the sleeve 37a or 37b at 38-13 is firmly screwed in, the mouth 34a or 34b is also between the reinforcement 35a or 35b and the neck 18 of the connection 12 a, or 12b pinched. So you get excellent poetry there.

An axial pipe 50 has a longitudinal passage 51 for mutual connection of connections 12a and 12b and a side wall 52 which has a plurality of perforations 53. Said side wall 52 is through a stack of disks 54 covered.

It will be noted that the perforations 53 and the spaces make the side wall 52 of the tube 50 permeable between the disks 54, so that the passage 51 communicates with the interior space 31.

The tube 50 has a first end 55a, which has a threaded support 56, which is screwed into the threaded hole 13 after the threaded support 38 of the sleeve 37a will. Between the thread support 56 and the washers 54 has

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the pipe'SO a smooth support 57, which in the socket 37a in connection ■ is inserted with the inner wall of the same.

The tube 50 is executed at its second end 55b without a thread support and only has a smooth support 58, which is movable in the axial direction is inserted into the sleeve 37 in contact with the inner wall thereof.

A deflector 60 is inserted into the longitudinal passage 51 of the pipe 50 and forms a resistance there, so that the connection of the two connections 12a and 12b via the permeable side wall 52, 54 of the tube 50 and above the interior space 31 of the separator 30 takes place.

The deflecting element 60 is axially adjustable in the passage 51 Position provided, for example by means of a diametrical, removable clip 61 which is pushed into the perforations 53. The organ 60 can be in the middle of the tube 50 or in contrast. azu be attached at a point which is related to this center point is shifted, with the aim of achieving different pressure losses above and below, with which frequency harmonies and thus resonance phenomena of the system can be avoided. The device thus allows high-frequency pulses to be picked up, for example of the order of magnitude from 300 to 400 Hertz.

The assembly is the following:

The parts 30a and 30b of the separator 30 are glued together at 30c, after 30 sleeves 37a and 37b have been inserted into the separator. Each sleeve 37a, 37b is then slid into reinforcement 35a, 35b at 36 and pinned at 39 held by clip 42.

The whole 30, 37a, 37b is inserted into the bottle 10 through one of the openings

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11a or lib introduced and the connection 12a is introduced into the bottle 10 via the opening 11a. One brings the split ring 14 with its elastic ring 15 through the opening Ua and one pushes the connection 12a into the called ring 14. The connections 12a are connected by attachment the parts 26, 23, 24 and by screwing the ring 20 at 21.

The sleeve 37a is screwed into the connection 12a at 38. At this time During assembly, the separator 30 is attached at its first end.

The same procedure for connection 12b and for the corresponding ring 14 with the elastic ring 15. When the connection 12b is attached, the sleeve 37b is screwed at 38 into said connection 12b.

Then the separator 30 is attached to the bottle 10 at both ends.

Finally, the tube 50 is pushed with the disks 54 and with the discharge element 60 from right to left in FIG. 1 into the bottle, the end 55b running movably at 57 into the sleeve 37b, while on the threaded support 38 pushes into the threaded hole 13 of the connection 12a.

It will be noted that in order to slide the washers 54 around the tube 50 the atifla ^ e 57 at the second end of this tube by a separate end 62 which is connected to the pipe by any means, for example a locking screw 63.

In terms of functioning, the bottle 10 is at 12a and at 12b with connected to the hydraulic system and the impulses must be dampened. Pressurized gas is blown into the outer space 32 through the valve 33.

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If a medium, especially a liquid, circulates in the system, for example in the direction from connection 12a to connection 12b, the liquid from the system into the passage 51 to the right of the discharge organ 60 and penetrates through the perforations 53 and the spaces between the panes 54 into the interior space 31 and exceeds then to the left of the organ 60, the perforations 53 and the spaces 54 to again enter the passage 51 to the left of. To penetrate organ 60, whereupon the drain towards connection 12b and the re-inlet in the plant.

As a result, this system also increases the impulses with high frequency dampen. By regulating the position of the organ 60 in the passage 51 can one optimization of the damping effect in every system while avoiding it of resonance phenomena.

One becomes the simple and convenient construction of the apparatus according to the above Description, as well as the possibility of adaptation to the expansion phenomena note both with regard to the movable mounting of the pipe 50 in the socket 37b and through the seals 23 and 24.

One will also notice that the medium dampens its impulses runs through the apparatus with minimal pressure loss.

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Claims (12)

AO Patent claims: t 1. / Impulse damper for hydraulic system with a stiff extension sensor cover with two opposing openings, one first and one second connection, each mounted in said openings to connect the damper to the hydraulic system, an elastic one Divider in the form of a bubble with two mouths, each attached to the said Connections are connected, said separator in said envelope an interior and an exterior with variable Forms volumes, a tube which has a longitudinal passage for the mutual connection of the connections mentioned and a lateral, permeable wall for connecting said passage with said interior space and a third connecting pipe for pressurized ones Media on the envelope, which are in defense with the aforementioned outer space stands for the purpose of damping the pulses, characterized in that at least one of the ends of the tube is movable is mounted. 2. Pulse damper according to claim 1, characterized in that said tube is fixed with one of its ends in the first connection is mounted and is axially movably mounted at its second end in the second link. 3. Pulse damper according to claim 1 to 2, characterized in that said mouths of the separator are fixed on a first or a second rigid sleeve fixed in the first and second joints respectively, said tube being axially movable is mounted with its second end inside and in connection with the second sleeve. 309808/0299 -4S- ΛΛ 4. Pulse damper according to claim 3, characterized in that the first end of the pipe to the first socket in the first joint one at a time are arranged. 5. Pulse damper according to claim 1-4, characterized in that perforated the side wall of the tube and covered it with a stack of washers is. 6. pulse damper according to claim 1-5,. characterized in that a discharge element is arranged in the longitudinal passage of the pipe, to form an obstacle there, so that the mutual connection of the two connections via the permeable side wall and the interior he follows. 7. Pulse damper according to claim 6, characterized in that said discharge member is one adjustable in said passage has ale layer. 8. Pulse damper according to claims 1-7, characterized in that that each connection is mounted in the corresponding opening of the envelope with sealing means, which two separate sealing elements exhibit. 9. Pulse damper according to claim 8, characterized in that one of said seals is radially between the opening and the connection em ge is pushed and cooperates axially with an inclined receptacle, while the other seal is placed against a flat receptacle of the envelope which encloses the opening. 10. Pulse damper according to claims 1-9, characterized in that that the disconnector consists of at least two parts, each with two opening 309808 / 02S9 22396 Ί 8 -χ- openings are provided, which are connected to each other. 11. Pulse damper according to claims 1-10, characterized in that that said third connection for media under pressure on the envelope has an injection valve of a compressible medium. 12. Pulse damper according to claim 1-10, characterized in that said third connection for media under pressure the envelope with a liquid space of a pressure accumulator s in Connection. Blank page