DE6600470U - DEVICE FOR SEALING A ROTATING AND / OR LONGITUDINAL MOVING ROD OR THE SAME. - Google Patents

Description

RA.103 654-23.2.67

J 2

Device for sealing a rotiei-end and / or in Longitudinal reciprocating rod or the like

The invention relates to a device for sealing giner rotating and / or in the longitudinal direction and forth movable rod or the like that auo a Exits space that is a pressurized plush contains o

In order to achieve such a seal, it is known that an elastic material is inserted into the leaky space in this way pressed so that it clings to the slightest unevenness in the rod. This is the way you try to pressurize the liquid to 'put greater pressure on' to prevent losses

This type of seal inevitably leads to undesirably strong friction when the rod rotates and / or moves longitudinally executes.

The invention is based on the object of avoiding the disadvantage indicated. This object is achieved according to the invention in that the part of the rod which passes through the exit point of the container is at least at its Surface made of a substance with strong liquid repellency Properties compared to the liquid and at the same point with no or only a slight contact pressure of

? * J Λ - 2 -

a ring used is surrounded, v / hich at least facing at its the liquid and the spar BSV / o is with the latter in contact surface is also made of a highly liquid-repellent material, v / obei a gap between rod unc ¹ ring a micro gap slightest extent practical forms in the plane of the pang side facing the liquid »

The micro-gap is created by means of the Adjustiorens deo ring onto the rod in such a way that its closest contact represents a line contact in a plane perpendicular to the rod axis? which practically coincides with the side of the ring facing the liquid

A modified embodiment of the device according to the invention consists in that the ring consists of an elastic material and the microgap by means of a corresponding one Constriction pressure of the ring is formed on the rod »An advantageous further development of this embodiment provides that between the ring and the inner wall of the container there is a constricting element which has a maximum constriction effect exerts in a plane perpendicular to the rod axis, the latter with the ring side facing the liquid practically coincides "

The material5 of which the rod and the ring are made at least sxi their facing surfaces is a plastic, preferential prices a halogen-containing plastic, such as polytetra-

fluoroethylene or Polytrifluormonochloräthyleno

According to the invention isf "of the liquid, the outlet is to be prevented from the container, at least one substance added ,, the fiüssigiceitsabv / amplified ice properties of plastics, in particular halogen-containing Kunstütoffen _5»

The invention is described below with reference to the drawing for example explained in more detail; show it:

F, g »1 a longitudinal section of the sealing device according to the invention;

Fig. 2 shows a longitudinal section of a modified embodiment

The sealing of the piston rod of a hydropneumatic shock absorber is chosen as an exemplary embodiment. Both figures show a piston rod 1 which reciprocating! executes and exits from a cylinder or container 2 containing a pressurized liquid 3 "

In Figo 1, a ring 4 is placed between the piston rod 1 and the inner wall of the container 2, which is made of a highly liquid-repellent Material consists o The piston rod 1 has a jacket 5 on the length of contact with the ring 4 a fabric that is also highly liquid-repellent en ο Of course you can also use the E: Lng 4 with just one

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. Cover liquid-repellent fabric instead of completely to produce from it, as well as the column rod 1 whole can produce from it instead of partially sheathing it with it ο

The ring 4 has a conical bore which narrows in the direction of the liquid 5 and comes into contact with the jacket 5, forming a sharp angle in FIG. 6. The parts 7 and 8 serve to hold or guide the piston rod 1 and have recesses 7a and 8a _o On the liquid side, the recess 7a stands over a bore _;

7b in connection with the liquid 3 «, ·]

j The ring 4 is adjusted precisely to the piston rod 1, <but the closest contact is in 6 »on that of the liquid!

side facing 4a of the ring 4 equip this intimate |

Due to manufacturing tolerances, the contact plane can have an axial _?

Possess width; it can also easily be removed from the plane of the \ ring side 4a

According to the invention, the tightness results from the existing Repulsive forces between the ring 4, the jacket 5 and the

Meniscus 9? which prevents the ingress of liquid under the The more resistance opposes the influence of pressure, alo she;

of the materials of which <Jer ring 4 and the cloak 5 are made, is repelled »

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From this it can be seen ₃ that at the exit point of a rod from a container a microgap is formed between two substances which have strong repellent properties to the pressurized liquid the pressure of the ring 4 on the piston rod 1 ITuIl, as well as the friction that results during movements

Another way of making this microgap is as modified embodiment with reference to FIG. 2 below he lukewarm; ο

In this case, the ring 4 ^T - cylindrical or conical, is made of an elastic material. Its largest inner diameter, which is opposite to the liquid side, corresponds to or is slightly below the piston rod diameter, which means that its smallest inner diameter, located in plane 4'a, must always be below the piston rod diameter , v / ao has the consequence that the ring 4 ¹ is widened by the assembly on the piston rod 1 and thus exerts the strongest pressure in the plane 6 and thus forms the smallest microgap at this point ο a constricting element in the form of a jacket Rubber is placed around the ring 4 ¹ in such a way that it protrudes over the latter at 10a. It is built into an annular space 2c and is more compressed at the end a than at the end b, so that it has the greatest pressure

I exerts on the ring 4 <at the point of the edge 6 «The element

j 10 makes it possible to compensate for inaccurate centering of the

I piston rod 1 in container 2 «

. If the fabric ₉ of which the ring + 'is made , elastic enough

I is ρ, its bore receiving the piston rod 1 can be cylindrical

J drisch., In this case it could also be the outside of the

ji ring 4 ^? conical and the mono-shaped head cylindrical

ii be »

I As a result of the constricting effect of the elastic fabric

I existing ring 4 'on the piston rod 1 v / ird he

wish? The resulting microgap achieved

ii

"J pressure is' _s but less than the case of such seals

S ^{1 of the} conventional type. Which corresponds to the minimal microgap

Ii

The end of the zone of greatest pressure is practically also one in the

IJ

'Ringiseite 4'a lying circle reduced < > This leaves the

I unsuspecting friction is low, since the pressure increases with the

j-

j; distance from edge 6 reduced »Of course this can

j circle of maximum pressure, v / ie already mentioned above, opposite

be slightly offset from the level of the ring side 4'a »

0470

Claims (1)

RA. tO3 65 ^ * 23.2.67 Λ2 ο Device for sealing a rotating and / or in the longitudinal direction reciprocating rod or the like that emerges from a space, the one ΐ contains liquid under pressure, thereby ge ^ ; ' i ^ SSi ^ sichnejfcj that through the exit point of the loading holder (2) through rope of the rod (1), at least on its surface, consists of a substance with strong liquid-repellent properties against the liquid (3) and at the gib ichen point with no or only slight contact pressure from an inserted urgent (4,4 ⁵ ), which at least on its surface facing the liquid (3) and the rod (1) or in contact with the latter is also made of a strongly liquid-absorbing substance, and there is a gap between Rod (1) and ring (4 ₉ 4 ') formed a micro-gap of the smallest extent practically in the plane of the liquid (3) 2; on the other side of the ring Device according to Αηορ-uch 1, thereby gekennseichn et that the micro gap by adjusting the ring (4) to the ; Rod (1) is created in such a way that its closest contact a line contact in one direction to the rod axis j plane represents; which is practical with that of the liquid (5) facing ring side coincides « y _ 2 - Device according to claim 1, characterized in that the ring (4 ^! ) Consists of an elastic material and the microgap is formed by means of a corresponding constriction of the ring (4 ¹ ) on the rod (1) » 4p device according to claim 3 _5, characterized in that sv / een the Hing (4 ') and the Innenv / and the container (2 / a constricting element (10), a maximum vrelch.es Einsehnüreffekt in a direction perpendicular to the bar axis level _{exerts, the latter practically s ainmenf all t o} with the ring side facing the liquid (3) Device according to claim 4? characterized in that the annular seam (2c) between the ring (4 ¹ ) and the inner v / and of the container (2) has a diameter increasing from the inside to the outside in the direction of the longitudinal axis of the container (2) and the constricting element (10 ) is a jacket made of elastic material, such as rubber, which surrounds the ring (4 ') » β ο device according to claims 5 to 5? thereby yekennzoichnet-. that the ring (4 ') has a conical bore before installation, which widens outwards, starting from the liquid side « 1 / ν 3 " Device according to Claims 3 to 5, characterized in that that the ring (4 ') has a cylindrical bore before installation ο 8ο Device according to & en claims 1 to 7, characterized in that the "ing (4,4 ^f ) is sharp-edged at its innermost point of contact with the rod (1) on the liquid side" ο Device according to one or more of the preceding claims, characterized in that the material from which the rod (1) and the ring (4 ₅ 4 ^f ) are made at least on their mutually facing surfaces is a plastic, preferably a halogen-containing plastic, such as Polytetrafluoroethylene or Polytrifluorsionochloriithylen, isto a device according to one or more of the preceding Claims, characterized in that at least one substance is added to the liquid (3), which makes the liquid repellent Properties of Kunä bstoffen, in particular of halogen-containing plastics, reinforced " ^ L - ^r > 4 7