DE1966993U - SEAL FOR HIGH PRESSURE DEVICES. - Google Patents

Description

GEORGE AIGUS & COMPANY LIMITED, fewcastle upon Tyne (England)

Seal for high pressure devices

The fire refers to a seal for high pressure devices, which comprises a ring made of rubber or some other elastomer that is in a part of the device mounted and radially deformed by contact with a part that is movable relative to it, and in this way a noteworthy one Prevents a pressurized flow medium from escaping along a gap between these parts.

A disadvantage of such a seal is that the sealing ring is easily pressed into the gap and thereby can be damaged. The fire is based on the task of creating sealing rings through which such a Damage by pressing in is prevented in a simple, quiet way.

According to the firing, a sealing ring is the one above described type combined with an anti-press-fit ring,

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which is "flexible", but made of a plastic with a significantly greater hardness than the sealing ring, such as e.g. polyamide ("lylotf *) or polytetrafluoroethylene (" P.T.F.E. ") and which has substantially the profile of a right triangle has, the right? TinkeL enclosing sides of which run radially or axially, the length of the radial Side approximately one third of the radial width of the sealing ring and the length of the axial side is essentially the axial length of that part of the associated sealing ring corresponds to, which rests against the anti-press-fit ring when in use and does not overlap with the relative has movable part for this purpose, and the; -radial and axial side are designed such that; the radial side with the Hy-. potenuse includes an angle of 40 to 70 °.

In a device in which the relatively movable part of the device extends through the sealing ring, the latter has, in the free state, a section with a smaller inner diameter than the diameter of the relatively movable part ¹ and this section consequently has an "overlapping dimension" in relation to the part that is movable relative to it. In a device in which the part that is movable relative to it lies outside the sealing ring, the sealing ring has a section with a larger dimension.

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sending diameter than the inner diameter of the movable relative to it Part and this part therefore has an "overlapping dimension" with respect to the relative moving part. ■ "..". ■■ "-"

The new anti-press fitting is combined with lip seals, e.g. U seals and manifold seals or other types of sealing rings, can be used; when used with a u-ring or manifold gasket the latter expediently has a flat radial surface and a bevel extending from this surface, so that when the anti-press-fit ring rests on the sealing ring the radial surfaces lie in a common plane.

Further advantages, details and features of the innovation emerge from the description below. In the drawing, ¹ is leuerungtbeispielsweise illustrated by a section through a manifold gasket of the furnace.

The hydraulic seal known as the manifold seal ^ can be used between a piston rod and a cylinder in which it is mounted. . ■

The seal consists of two separable Parts, namely a sealing ring and an anti-press-fit ring.

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The sealing ring, which has a substantially I-shaped profile is made of rubber and has a radial lip 10 and a radially inner lip 11 which extends axially from a base 12 ο ^ -

The inner diameter of the "base 12 is larger than that Diameter of the piston rod 14 and your outside diameter smaller than the cylinder diameter 15 = that. free end of the lip has an intersecting one with respect to the cylinder diameter knife 15 Dimension and the free: end of the lip 11 has one overlapping dimension in relation to the diameter of the piston rod, which in this case is the one that is movable relative to it Part represents -:

The anti-press-fit ring 16 is made of hard but flexible polyamide and has the profile of a right triangle. The right angle is enclosed between the radial surface and the axial surface 18.-The width of the surface 17 is approximately 1/3 of half the difference between the diameters 14 and 15 * ^; The axial width of the "FlächB 18 corresponds to the axial dimension of the: sealing ring ^ starting from its base surface 19 to the point at which the inner diameter of the ring becomes smaller than the diameter 14. These widths are designed such that the angle between the surface 17 and the hypotenuse surface 20 is approx. 60 °.

The base 12 of the sealing ring is to receive the Anti-press-fit ring ■ 16 bevelled inwards, thereby lying the surface 17 on the same level as the straight base surface and does not protrude beyond this. :;

The anti-press-in ring 16 must be flexible enough to seal off each outflow gap under the effect of a relatively low pressure. ; _: -

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Claims (1)

S c hut ζ a η s ρ r u c h: Seal for high pressure devices, with a sealing ring made of an elastomer, which is mounted in a part of the device and by contact with one; is radially deformable relative to the moving part in order to avoid a significant escape of pressurized flow medium at a gap between the parts, characterized by a flexible anti-press-fit ring (16) made of a plastic with considerably greater hardness than the elastomer of the sealing ring and with a Cross-section which essentially has the profile of a right triangle whose sides (17, 18) enclosing the right angle run in the radial or axial direction, the length of the radial side (17) being approximately one third of the radial width of the sealing ring ( 10, 11, 12) and the length of the axial side (18) is approximately the same as the asial design of that IeIIs - the associated sealing ring (1O ₅ 11 -, "12 ^ corresponds to ₉ - which during operation with the anti-press-fit ring (16) cooperates and has a radial distance from the relatively movable part, and the radial and axial side (17, 18) are designed such that s the radial side (17) with the hypotenuse (20) includes an angle between 40 and 70 °, and continues through it marked j that the sealing ring has a U-profile and on its base (12) a straight radial side (19) with a has bevel extending from this side, so that When the anti-press-fit ring (16) rests on the sealing ring, the radial sides (17, 19) lie in the same plane.