CN2319632Y

CN2319632Y - Sealing device of automatic regulating seal property

Info

Publication number: CN2319632Y
Application number: CN 98226066
Authority: CN
Inventors: 张春亮
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-26
Filing date: 1998-02-26
Publication date: 1999-05-19
Anticipated expiration: 2008-02-26

Abstract

The utility model discloses a sealing device which automatically regulates seal property. One end of the section of a stuffing polytetrafluoroethylene slip ring of the device forms a wedge shape, and the other end forms a rectangular shape. The seal property can be automatically regulated, the sealing is reliable, the friction coefficient is low, and the self lubricity is good. The utility model doesn't have creep phenomenon. The utility model has the advantages of simple structure, convenient installition, and low cost. The utility model can be used for a hydraulic transmission, and is particularly suitable for piston rod seal.

Description

Automatically regulate the seal arrangement of sealing

The utility model relates to a kind of seal arrangement, especially the seal arrangement of hydraulic transmission.

Seal arrangement is the important component part of hydraulic transmission, is to be used for preventing the leakage of working medium and the intrusion of extraneous dust gas.Chinese patent publication number CN1115018A discloses a kind of seal arrangement, and this device adds upper O-shape ring by imperforation rectangle slip ring and forms.This device is wear-resisting, but the decrement of its O shape circle is non-adjustable.When sealed high pressure, O shape circle must be with big compressibility, and that big compressibility state O shape is down enclosed the generation permanent deformation is also big, make seal failure easily, and resistance is bigger under the low pressure.

The purpose of this utility model is will provide a kind of can regulate the seal arrangement of the automatic adjusting sealing of O shape circle decrement according to the pressure size automatically.

The purpose of this utility model is achieved in that by O-ring seals and filled polytetrafluoroethylene slip ring to be formed, and O-ring seals is enclosed within the outside of filled polytetrafluoroethylene slip ring, and cross section one end of filled polytetrafluoroethylene slip ring is wedge shape, and the other end is rectangular.

The width of filled polytetrafluoroethylene slip ring is at 1.5～20mm.

The angle of wedge shape is at 10～45 degree.

The thickness of rectangle is at 0.5～2mm, and the rectangle width is at 0.5～10mm.

O-ring seals of the present utility model when outwards moving along the wedge shape inclined-plane, changes decrement owing to being subjected to spatial constraints, thereby the O-ring seals compressibility is changed under the impressed pressure effect.When impressed pressure hour, O-ring seals keeps less compressibility, when impressed pressure increases, the corresponding increase of O-ring seals compressibility.This just ability that changes the O-ring seals compressibility with impressed pressure is automatically regulated sealing automatically becomes possibility: seal contact pressure less relatively when low working pressure just can play good seal action, at this moment, this just an amount of contact pressure that provides of this device.When high pressure, need big contact pressure, at this moment, O-ring seals is in the maximum distortion state, big these needs of seal contact pressure when providing bigger deformation pressure to adapt to high pressure.

The utility model sealing can be regulated automatically, and sealing is reliable, and friction ractor is low, no creeping phenomenon, well self lubricity.It is simple in structure, and is easy for installation, and cost is low, can be used for hydraulic transmission, is specially adapted to rod seal.

Elaborate below in conjunction with drawings and Examples.

Fig. 1 is an an embodiment's of the present utility model structural drawing.

Structural drawing when Fig. 2 is a kind of working state of the utility model.

Fig. 3 is a filled polytetrafluoroethylene slip ring structural drawing of the present utility model.

1.O shape seal ring among the figure, 2. filled polytetrafluoroethylene slip ring, 3. spool.

In Fig. 1 and Fig. 2, filled polytetrafluoroethylene slip ring (2) is enclosed within the outside of axle (3), and O-ring seals (1) is enclosed within the outside of filled polytetrafluoroethylene slip ring (2), and cross section one end of filled polytetrafluoroethylene slip ring (2) is wedge shape, and the other end is rectangular.

The width of slip ring (B) is 10mm in Fig. 3.The angle of wedge shape (α) is 15 degree.The thickness of rectangle is 1mm, and width (b) is 3mm.

In Fig. 1, seal arrangement is pressurized or when being subjected to low pressure, O-ring seals (1) is in less compressibility state not, enough big seal contact pressure so both was provided, reduce the distortion of O-ring seals (1) again, reduced the permanent deformation of its generation, prolonged the life-span of O-ring seals (1).Because whether the quality and the O-ring seals (1) of the sealing in the seal arrangement have better elastic that direct relation is arranged, so prolonged the life-span of O-ring seals (1), promptly be the life-span that has prolonged whole sealing device, and the sealing frictional resistance of this moment is very low.

In Fig. 2, when working pressure (P) increased, the decrement of O-ring seals (1) increased, and compressive force strengthens, thereby seal contact pressure is increased, and had improved sealing, sealed more reliable.The pressure that is to say sealing is big more, seals reliable more.Simultaneously, the power that O-ring seals (1) is pressed on the filled polytetrafluoroethylene slip ring (2) also becomes evenly, has alleviated the wearing and tearing at rectangle position.Since stressed even, so the frictional resistance on the unit area is little relatively, alleviated the wearing and tearing of filled polytetrafluoroethylene slip ring (2), prolonged the life-span of filled polytetrafluoroethylene slip ring (2).

Claims

1, regulate the seal arrangement of sealing automatically, be made up of O-ring seals and filled polytetrafluoroethylene slip ring, O-ring seals is enclosed within the outside of filled polytetrafluoroethylene slip ring, it is characterized in that cross section one end of filled polytetrafluoroethylene slip ring is wedge shape, and the other end is rectangular.

2, the seal arrangement of automatic adjusting sealing according to claim 1, the width that it is characterized in that the filled polytetrafluoroethylene slip ring is at 1.5-20mm.

3, the seal arrangement of automatic adjusting sealing according to claim 1, the angle that it is characterized in that wedge shape is at 10～45 degree, and the thickness of rectangle is at 0.5～2mm, and the width of rectangle is at 0.5～10mm.