CN202125613U

CN202125613U - Bidirectional transformation type seal ring

Info

Publication number: CN202125613U
Application number: CN2011202164277U
Authority: CN
Inventors: 刘君腾; 杨栋伦
Original assignee: Chongqing Dazu Dongneng Mine Material Co ltd
Current assignee: Chongqing Dazu Dongneng Mine Material Co ltd
Priority date: 2011-06-24
Filing date: 2011-06-24
Publication date: 2012-01-25
Anticipated expiration: 2021-06-24

Abstract

The utility model discloses a bidirectional transformation type seal ring, which is composed of a seal ring body, an annular cavity arranged in a solid part of the seal ring body and an annular groove arranged on the seal ring body. The bidirectional transformation type seal ring is characterized in that the annular groove is arranged on an end face of the seal ring body and communicated with the annular cavity and the outer environment, and the external diameter of the annular groove is smaller than that of the annular cavity. The bidirectional transformation type seal ring has the advantages that axial pressure exerted on the seal ring by fluid can be converted to radial pressure, the inner surface of the seal ring can be extruded inwards, and the outer surface of the seal ring can be extruded outwards, thereby enabling the seal ring to be tightly attached to the surfaces of sealed structures.

Description

A kind of double-deformation formula seal ring

Technical field

The utility model relates to a kind of seal ring, relates in particular to a kind of double-deformation formula seal ring.

Background technique

Piston rod motive sealing in present known oil hydraulic cylinder or the pneumatic linear actuator, its initial sealing power all are to lean on seal ring radial deformation extrusion piston rod or oil cylinder inner surface and reach sealing purpose.And it is all very high to the surface Machining required precision of piston rod type oil cylinder; Along with the constantly creep, aging of wearing and tearing and sealing ring material of seal ring; Pressure between seal ring and piston rod or the oil cylinder reduces gradually, makes sealing effect descend gradually, final seal failure.

A kind of O-ring seal (see figure 10) of energizing is arranged in recent years; It by the seal ring body, be arranged on the intrinsic annular chamber of seal ring and the circular groove that is arranged on the seal ring inner body wall is formed; When the seal ring body with by the sealing configuration socket after, circular groove is closed, the Fluid Volume relative fixed in the annular chamber; When seal ring is extruded; Outwards protuberance is with gap closing for arc surface on the annular chamber outer wall, and the hydrodynamic pressure in the annular chamber is that arc surface provides support power and for annular chamber recovers deformation restoring force is provided, thereby reaches the effect of sealing.

The seal ring of this structure, because its circular groove is arranged on the seal ring inwall, processing technology is very complicated; And its arc surface area of contact is greater than the area of contact of the linear sealing of tradition, and the surface friction drag of piston rod return is very big, and the return time is long; Seal ring self wearing and tearing are also very fast relatively; Manufacture cost is high, and mounting process is numerous and diverse, is unfavorable for extensive popularization.

The model utility content

To the problem in the background technique; The utility model provides a kind of double-deformation formula seal ring; It by the seal ring body, be arranged on the annular chamber in the seal ring body solid section, the circular groove that is arranged on the seal ring body is formed; Its improvement is: circular groove is arranged on the end face of seal ring body, and circular groove is communicated with annular chamber and external environmemt; The circular groove external diameter is less than the annular chamber external diameter.

Based on aforesaid seal ring structure, the further improvement that the utility model is done has: be provided with two annular protrusions on the said annular chamber outer wall at least, annular protrusion forms sealing lip, passes through the annular groove transition between two sealing lips.

The further improvement that the utility model is done also has: said annular chamber outer wall inner side surface shape changes with sealing lip, annular groove tendency.

The further improvement that the utility model is done also has: the circular groove outer edge is provided with a plurality of breach, and a plurality of breach circumferentially evenly are provided with along the seal ring body.

The further improvement that the utility model is done also has: the seal ring body is provided with mesopore, and the hole wall enclosed space of mesopore forms truncated conical shape, and the minor radius end of round platform and circular groove are on the same end face of seal ring body.

The further improvement that the utility model is done also has: circular groove is arranged on one of them end face of seal ring body, and another end face of seal ring body is provided with the shaft shoulder.

The useful technique effect of the utility model is: can fluid be converted into radial pressure to the axial pressure that seal ring applies, make that the seal ring internal surface inwardly pushes, outer surface outwards pushes, thereby let seal ring be close to by the sealing configuration surface.

Description of drawings

Fig. 1, the utility model structural profile schematic representation;

Fig. 2, structure stress shown in Figure 1 portion partial enlarged drawing;

The end view of Fig. 3, structure shown in Figure 1;

The utility model structural profile schematic representation of Fig. 4, outer wall belt sealing lip structure;

The utility model structural profile schematic representation of ring channel structures in Fig. 5, the band;

Fig. 6, notched ring channel structures end view;

The structural profile schematic representation of Fig. 7, band frustoconic shape mesopore;

The structural profile signal of Fig. 8, tape spool shoulder;

Fig. 9, the utility model and the assembling schematic representation when being connected by sealing configuration;

Figure 10, the existing ring structure generalized section of energizing;

Figure 11, existing Y V-shaped ring structural profile schematic representation.

Embodiment

Referring to Fig. 1,3; The scheme of the utility model is: it by seal ring body 1, be arranged on the annular chamber 2 in seal ring body 1 solid section, the circular groove 3 that is arranged on the seal ring body 1 is formed; Its innovation part is: circular groove 3 is arranged on the end face of seal ring body 1, and circular groove 3 is communicated with annular chamber 2 and external environmemt; Circular groove 3 external diameters are less than annular chamber 2 external diameters.

The utility model is that with the maximum difference of ring seal ring (hereinafter to be referred as the ring of energizing) of energizing that has inner-cavity structure equally sealing principle is different; Specifically: the action principle of the ring of energizing is; Energize and encircle under the pressure effect of fluid externally, deformation, the both ends of the surface distance shrinkage of ring are given birth in the environment-development of energizing; (in fact the ring of energizing has formed the airbag structure of a similar tire to fluid thereby extruding is energized in the ring inner chamber; The fluid of ring in the inner chamber of energizing served as the transmitter's of power role, and external pressure can partial loss in transmittance process, that part of deformation recovery power that overcoming the ring body of energizing that is mainly used in of loss); Make the arc surface on the ring outer wall of energizing continue outwards protuberance, reach sealing effect; The principle of the utility model structure is: annular chamber 2 is communicated with external environmemt through circular groove 3; Fluid gets in the annular chamber 2 through circular groove 3; The axial pressure that fluid had is converted into radial pressure after annular chamber 2 guiding; Hydrodynamic pressure radially acts directly on the inboard of annular chamber 2 inwalls and the inboard of outer wall, makes annular chamber 2 inwalls inwardly push (among Fig. 2 shown in the power F1) and makes annular chamber 2 outer walls outwards push (among Fig. 2 shown in the power F2), reaches sealing effect;

The utility model has the advantages that, make axial hydrodynamic pressure be converted into hydrodynamic pressure radially and affact on the sealing surface that the active force loss that fluid affacts on the sealing surface is little; Energize relatively the ring inflatable balloon-like structure, deformation also takes place in the seal ring body 1 of the utility model more easily, sealing surface with got tightr by the sealing configuration surface binding; And the circular groove 3 of the utility model is arranged on the end face, compares circular groove 3 and is arranged on the ring of energizing on the inwall, more easily processing.

The utility model also is different from traditional Y V-shaped ring (seeing Figure 11); Because the circular groove of the utility model 3 external diameters are less than annular chamber 2 external diameters; Make the inside folding of annular chamber 2 openings; Form the not available annular chamber 2 of Y V-shaped ring (groove that only possesses ring-type on the Y V-shaped ring), make the utilization ratio of hydrodynamic pressure higher; And the Y V-shaped ring does not possess the function that axial hydrodynamic pressure is converted into hydrodynamic pressure radially yet.

Referring to Fig. 4, on the basis of aforementioned schemes, the utility model has also carried out following improvement: be provided with two annular protrusions at least on said annular chamber 2 outer walls, annular protrusion forms between 4, two sealing lips 4 of sealing lip through annular groove 5 transition.In view of structure; Sealing lip 4 is with less by the surface of contact area of sealing configuration; Under the certain condition of seal ring body 1 axial length, even an amount of a plurality of sealing lips 4 are set, total sealing lip 4 outer surfaces area of contact also the area of contact of arc surface than the ring of energizing is little; The resistance that receives during piston motion is also less relatively, and piston is return more easily; And; Annular chamber 2 outer wall thickness at annular groove 5 places must be thinner than annular chamber 2 outer wall thickness at sealing lip 4 places; After fluid pressure action is to the annular chamber 2 outer wall inner side surfaces; Deformation takes place than the outer wall at sealing lip 4 places in the outer wall at annular groove 5 places more easily, and this just makes outer wall that bending upwards takes place at annular groove 5 places, and two sealing lips 4 are drawn close each other; Cause the structure at sealing lip 4 places of downside that deformation takes place laterally, make downside sealing lip 4 with contacted closelyr by the sealing configuration surface.

Referring to Fig. 5, based on aforesaid sealing lip 4 structures, the utility model has also been done following improvement: annular chamber 2 outer wall inner side surface shapes change with sealing lip 4, annular groove 5 tendencies.It in essence; Interior circular groove 4-1 with sealing lip 4 positions (promptly being at sealing lip 4 back sides), form fit is set on annular chamber 2 outer wall inner side surfaces exactly; The benefit of doing like this is, the one, and the outer wall thickness at sealing lip 4 places is reduced, be more conducive to structure and under fluid pressure action, deformation take place; The 2nd, fluid can get in the interior circular groove 4-1; Directly from the inner side surface extrusion ring connected in star 5 of two sealing lips 4, the trend that two sealing lips 4 are drawn close is stronger, the sealing lip 4 that makes downside with contacted closelyr by the sealing configuration surface.This structure needing on piston rod or the oil cylinder to be particularly suited for sealing part that the situation of defectives such as coating comes off, scuffing, wearing and tearing, corrosion, distortion is arranged; Seal ring body 1 can with closely contact by the formed erose body structure surface of defective, reach sealing effect.

Referring to Fig. 6, the utility model has also been done following improvement to the circular groove 3 in the aforementioned structure: circular groove 3 outer edges are provided with a plurality of breach 3-1, and a plurality of breach 3-1 circumferentially evenly are provided with along seal ring body 1.Though be provided with a plurality of breach 3-1, a plurality of breach 3-1 outer side still are less than the radius of annular chamber 2 along the radius of the formed circular trace of line.Breach 3-1 can make fluid get into annular chamber 2 fast, makes the deformation quantity of seal ring body 1 make rapid response with change in fluid pressure; If when seal ring body 1 deformation ratio is big, might make circular groove 3 interior outer side along contact, thereby cause annular chamber 2 to be closed, in this case, the if structure body is provided with breach 3-1, and then fluid still can get in the annular chamber 2 through breach 3-1.

Referring to Fig. 7, seal ring body 1 is provided with mesopore 1-2, and the hole wall enclosed space of mesopore 1-2 forms truncated conical shape, and the minor radius end of round platform and circular groove 3 are on the same end face of seal ring body 1.After structure in being socketed in mesopore 1-2 is propped up the minor radius end of round platform, be equivalent to apply a prestressing force radially, outside, sealing lip 4 is outwards pushed, increase the active force on the sealing surface to the structure at circular groove 3 places.

Referring to Fig. 8, circular groove 3 is arranged on one of them end face of seal ring body 1, and another end face of seal ring body 1 is provided with shaft shoulder 1-3.Shaft shoulder 1-3 is used on seal ring body 1 cover and takes over control and squeeze ring washer 8 and (see Fig. 9; Its end of structure shown in the mark 9 is enclosed within the mesopore 1-2 among the figure; Structure internal surface shown in the mark 10 contacts with sealing lip 4), the anti-ring washer 8 that squeezes can play a protective role to sealing configuration.

Claims

1. double-deformation formula seal ring; It by seal ring body (1), be arranged on the annular chamber (2) in seal ring body (1) solid section, the circular groove (3) that is arranged on the seal ring body (1) is formed; It is characterized in that: circular groove (3) is arranged on the end face of seal ring body (1), and circular groove (3) is communicated with annular chamber (2) and external environmemt; Circular groove (3) external diameter is less than annular chamber (2) external diameter.

2. a kind of double-deformation formula seal ring according to claim 1; It is characterized in that: be provided with two annular protrusions at least on said annular chamber (2) outer wall; Annular protrusion forms sealing lip (4), passes through annular groove (5) transition between two sealing lips (4).

3. a kind of double-deformation formula seal ring according to claim 2 is characterized in that: said annular chamber (2) outer wall inner side surface shape changes with sealing lip (4), annular groove (5) tendency.

4. a kind of double-deformation formula seal ring according to claim 1 is characterized in that: circular groove (3) outer edge is provided with a plurality of breach (3-1), and a plurality of breach (3-1) circumferentially evenly are provided with along seal ring body (1).

5. according to claim 1,2,3 or 4 described a kind of double-deformation formula seal rings; It is characterized in that: seal ring body (1) is provided with mesopore (1-2); The hole wall enclosed space of mesopore (1-2) forms truncated conical shape, and the minor radius end of round platform and circular groove (3) are on the same end face of seal ring body (1).

6. according to claim 1,2,3 or 4 described a kind of double-deformation formula seal rings; It is characterized in that: circular groove (3) is arranged on one of them end face of seal ring body (1), and another end face of seal ring body (1) is provided with the shaft shoulder (1-3).