CN201539563U

CN201539563U - Improved piston rod seal U-shaped ring

Info

Publication number: CN201539563U
Application number: CN200920218199XU
Authority: CN
Inventors: 朱新合
Original assignee: 青岛开世密封工业有限公司
Priority date: 2009-10-20
Filing date: 2009-10-20
Publication date: 2010-08-04

Abstract

The utility model discloses an improved piston rod seal U-shaped ring, so as to enhance the sealing performance of the existing U-shaped ring. The piston rod seal U-shaped ring after improvement clamps an O-shaped ring between an inner lip and an outer lip of the U-shaped ring, thereby leading a product to utilize the O-shaped ring added in the middle of the U-shaped ring to ensure the magnitude of interference of the lips on the two sides to a piston rod under the condition that the pressure of a system is lower, and ensuring the sealing performance of a hydraulic cylinder; and when the pressure of the system is increased, the U-shaped ring is in the trend of opening the inner lip and the outer lip of the U-shaped ring outwards, thereby increasing the magnitude of interference of the product to the piston rod and keeping the sealing capacity.

Description

Improved type rod seal U type circle

Technical field

The utility model relates to a kind of improved type rod seal U type circle.

Background technique

Existing piston rod seal U type circle as shown in Figure 1, yet the suitable pressure ratio of this product is lower, sealability instability, and the gap of getting into cylinder and piston rod when pressure is higher easily causes product failure.

The model utility content

The utility model provides a kind of improved type rod seal U type circle, to strengthen the sealability of existing U type circle.

For reaching above-mentioned purpose, the improved type rod seal U type circle that the utility model provides has pressed from both sides an O type circle between the interior outer lip of described U type circle.The interior outer lip of the rod seal U type circle after the improvement is assemblied on the piston rod with less magnitude of interference, under the lower condition of system pressure, the O type circle that product can utilize U type circle centre to add guarantees the magnitude of interference to piston rod of both sides lip, guarantees the sealability of oil hydraulic cylinder; When system pressure increases, make U type circle make the outside open trend of outer lip in the U type circle, increase the magnitude of interference of product to piston rod, keep sealability.

Further, can also have additional a back-up ring, thereby effectively avoid this U type circle when pressure is higher, to get into the gap of cylinder and piston rod and cause the problem of product failure at the root of described U type circle.

To sum up, the improved type rod seal U type circle that the utility model provides has strengthened sealability than existing U type circle, goes for bigger suitable pressure range and allows bigger suitable gap.

Description of drawings

Fig. 1 is the sectional view of existing piston rod seal U type circle;

The sectional view of the improved type rod seal U type circle that Fig. 2 provides for the utility model.

Specific embodiment

Below in conjunction with Figure of description embodiment of the present utility model is done detailed description.

The utility model provides a kind of improved type rod seal U type circle, as shown in Figure 2, pressed from both sides an O type circle (3) between the inner lip (1) of this U type circle and the outer lip (2), and root has additional a back-up ring (4).Thereby make:

On the one hand, the interior outer lip of the rod seal U type circle after the improvement is assemblied on the piston rod with less magnitude of interference, under the lower condition of system pressure, the O type circle that product can utilize U type circle centre to add guarantees the magnitude of interference to piston rod of both sides lip, guarantees the sealability of oil hydraulic cylinder; When system pressure increases, make U type circle make the outside open trend of outer lip in the U type circle, increase the magnitude of interference of product to piston rod, keep sealability.

On the other hand, being provided with of root back-up ring effectively avoided this U type circle to get into the gap of cylinder and piston rod when pressure is higher and caused the problem of product failure.

In the present embodiment, the rod seal U type circle after the improvement has strengthened sealability than existing U type circle, and goes for bigger suitable pressure range and allow bigger suitable gap, has also increased the shelf life of product simultaneously.

More than; it only is preferred embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claim was defined.

Claims

1. an improved type rod seal U type circle is characterized in that, has pressed from both sides an O type circle between the interior outer lip of described U type circle.

2. improved type rod seal U type circle according to claim 1 is characterized in that the root of described U type circle has additional a back-up ring.