CN202228677U

CN202228677U - High-pressure rotational combined seal ring

Info

Publication number: CN202228677U
Application number: CN2011203609634U
Authority: CN
Inventors: 刘邦民
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-19
Filing date: 2011-09-19
Publication date: 2012-05-23
Anticipated expiration: 2021-09-19

Abstract

The utility model relates to a high-pressure rotational combined seal ring which comprises a first layer seal element and a second layer seal element, wherein the inner sides of the seal elements are provided with circular arc cambers convex towards the inner sides; the outer side surface of the second layer seal element is provided with a circular arc camber which is concave towards the inner side; the part of the inner side surface of the first layer seal element and the part of the outer side surface of the second layer seal element are correspondingly connected; the radius of the circular arc camber which is concave towards the outer side surface of the second layer seal element is greater than the radius of the circular arc camber which is convex towards the inner side surface of the first layer seal element; and the inner side surface of the second layer seal element is provided with two oil guide grooves. Because convex and concave cambers are arranged between the first layer seal element and the second layer seal element, when the high-pressure rotational combined seal ring is used, under the applied force by a seal medium (such as hydraulic oil) between the second layer seal element and a rotary shaft, partial pressure is easy to be balanced; and the oil guide grooves are additionally arranged, the oil grooves can form a sealed oil storage cavity under the unidirectional applied force of the seal elements, and an uniform oil film seal element effect is generated, thus the frictional force between the seal ring and the rotary shaft is reduced, the seal effect is better, and the seal ring has a long service life.

Description

A kind of high-pressure rotary combined seal ring

Technical field

The utility model relates to a kind of seal ring of mechanical usefulness, particularly relates to a kind of high-pressure rotary combined seal ring.

Background technique

The high-pressure rotary combined seal ring is used on the engineering machinery such as excavator as high pressure rotary sealing spare, the extraordinary Sealing that is mainly combined by rubber material outer (being the first layer Sealing) and engineering plastics internal layer (being second layer Sealing).Existing like product is not because the joint between first layer Sealing and the second layer Sealing is provided with protrusion and recessed curved surface; It is excessive to be easy to generate local deformation in the use; Cause the local compression between second layer Sealing and the running shaft unbalanced, adding does not have lubrication system, has increased friction; Leakage of oil easily, working life is short.

Summary of the invention

The purpose of the utility model just provides a kind of high-pressure rotary combined seal ring, in use seal ring and running shaft surface of contact stress equalization, lubricating contact between seal ring and the running shaft, not easy oil leakage, long service life.

For achieving the above object, the utility model adopts following technological scheme:

A kind of high-pressure rotary combined seal ring; Comprise: first layer Sealing and second layer Sealing; The inner side surface of described Sealing is provided with the circular arc camber of protrusion to the inside; The outer side surface of second layer Sealing is provided with recessed to the inside circular arc camber; First layer Sealing inner side surface and the corresponding connection in second layer Sealing outer side surface position, the circular arc camber radius that the recessed circular arc camber radius of second layer Sealing outer side surface protrudes greater than first layer Sealing inner side surface, the inner side surface of second layer Sealing is provided with two oil guide slot.

The inner side surface of described second layer Sealing is the circular arc camber that protrudes to the inside; Article two, oil guide slot is separately positioned on the curved surface of top and bottom of inner side surface circular arc camber; The cross section of oil guide slot is recessed circular arc, and oil guide slot connects along the inner side surface of second layer Sealing from beginning to end.

The beneficial effect of the utility model: owing between first layer Sealing and second layer Sealing, be provided with protrusion and recessed curved surface; In use ought receive under the active force of sealing medium (like hydraulic oil) between second layer Sealing and the running shaft, local compression is balanced easily, adds and is provided with oil guide slot; This oil groove can be under the Sealing single load bearing; Form the shoe cream room of sealing, produce uniform oil film seal spare effect, the frictional force between seal ring and the running shaft is reduced; Sealing effect is better, the seal ring long service life.

Description of drawings

Fig. 1 is one of them embodiment's of the utility model a plan view.

Fig. 2 is that the A-A of Fig. 1 is to sectional view.

Fig. 3 is the B place partial enlarged drawing of Fig. 2.

Fig. 4 is the utility model first layer Sealing schematic cross-section.

Fig. 5 is the utility model second layer Sealing schematic cross-section.

Fig. 6 uses schematic representation mechanically for the utility model.

Fig. 7 is the partial enlarged drawing at Fig. 6 C place.

View when Fig. 8 receives the sealing medium active force when using for the utility model.

Fig. 9 is an existing product user mode schematic representation.

Embodiment

Can find out that referring to figs. 1 through Fig. 5 the utility model comprises: first layer Sealing 1 and second layer Sealing 2, first layer Sealing 1 are in the outside, and second layer Sealing 2 is in interior survey, and two combination accessories use in the use.The inner side surface 12 of described Sealing 1 one side of the seal ring center of circle (promptly near) is provided with the circular arc camber of protrusion to the inside; The outer side surface 21 of second layer Sealing 2 one side of the seal ring center of circle (promptly away from) is provided with recessed to the inside circular arc camber; First layer Sealing inner side surface and the corresponding connection in second layer Sealing outer side surface position; The circular arc camber radius that (state of promptly not installing and using) second layer Sealing outer side surface 21 recessed circular arc camber radiuses protrude greater than first layer Sealing inner side surface 12 under the normality situation, the inner side surface 26 of second layer Sealing is provided with two oil guide slot 24,25.The inner side surface 26 of described second layer Sealing is the circular arc camber that protrudes to the inside; Article two,

oil guide slot

24,25 is separately positioned on the curved surface of top and bottom of inner side surface (as shown in Figure 5); The cross section of oil guide slot is recessed circular arc, and oil guide slot connects along the inner side surface of second layer Sealing from beginning to end.First layer Sealing 1 is respectively equipped with chamfering 11,22,23 with second layer Sealing 2.

Fig. 6, Fig. 7 are that the utility model uses schematic representation mechanically, generally are the uses that are arranged above and below of several groups of seal rings in the use.The seal ring inner ring connects running shaft 3, and the seal ring outside connects sealing seat 4, and sealing medium is a hydraulic oil.

Fig. 8 is the utility model user mode schematic representation.As can be seen from the figure; When hydraulic oil is exerted pressure 6 the time, since the effect of first layer Sealing and second layer Sealing joint circular arc camber, pressure 5 equalizations that the surface of contact between second layer Sealing top and the running shaft is suffered; Hydraulic oil lubricate in the oil guide slot 24 on top; Frictional force reduces, therefore not easy oil leakage, long service life.

Fig. 9 is an existing product user mode schematic representation.As can be seen from the figure, when hydraulic oil is exerted pressure 10 the time, because the joint of first layer Sealing 7 and second layer Sealing 8 is up and down straight; The suffered pressure 9 of surface of contact between second layer Sealing 8 tops and the running shaft 3 is unequal; Lean on upper pressure big more more, play hydraulic oil not have lubrication for a long time in working order, frictional force is very big; Therefore leakage of oil easily, working life is short.

Claims

1. high-pressure rotary combined seal ring; Comprise: first layer Sealing (1) and second layer Sealing (2); It is characterized in that: the inner side surface (12) of first layer Sealing (1) is provided with the circular arc camber of protrusion to the inside; The outer side surface (21) of second layer Sealing (2) is provided with recessed to the inside circular arc camber; First layer Sealing inner side surface and the corresponding connection in second layer Sealing outer side surface position, the circular arc camber radius that the recessed circular arc camber radius of second layer Sealing outer side surface (21) protrudes greater than first layer Sealing inner side surface (12), the inner side surface of second layer Sealing is provided with two oil guide slot (24,25).

2. a kind of high-pressure rotary combined seal ring according to claim 1; It is characterized in that: the circular arc camber of the inner side surface of second layer Sealing (26) for protruding to the inside; Article two, oil guide slot (24,25) is separately positioned on the curved surface of top and bottom of inner side surface circular arc camber; The cross section of oil guide slot is recessed circular arc, and oil guide slot connects along the inner side surface of second layer Sealing from beginning to end.