CN218063403U - Swing piston seal structure - Google Patents

Abstract

The utility model provides a swing piston seal structure, relates to the moving part sealing technology field, and it is used for rotating the sealed of output for reciprocating motion's connecting rod structure, seal structure is for the rotator structure who possesses the axis, and be central disk, cover shape portion and outer dish from inside to outside in proper order, outer dish supports and leans on the base member of swing piston structure internal fixation, central through-hole has been seted up to central disk inside, central disk passes through central through-hole cover is located drive on the part of piston structure internalization, cover shape portion is for possessing the extension seal structure axial displacement perhaps prolongs the rubber membrane structure of center swing deformation. The sealing principle adopted by the whole sealing structure is isolation type sealing and non-contact type sealing, so that the absolute sealing effect can be achieved.

Description

Swing piston seal structure

Technical Field

The utility model relates to a moving part sealing technique field especially relates to a swing piston seal structure.

Background

In the prior art, a structure that a connecting rod is matched with a piston is usually adopted to realize linear reciprocating motion, the connecting rod and the piston are usually connected by adopting a connecting rod pin structure, the part of the piston connected with the connecting rod is usually arranged to be a cross structure, and a seal is arranged outside the piston and used for blocking gear oil in a box body.

For example, in the prior art, a reciprocating structure is realized by matching a connecting rod with a piston in fig. 1, the structure is complex, and the reciprocating structure is provided with a piston a, a piston seal b, a seal cover plate c, a connecting rod pin d, an O-ring e and a connecting rod f, wherein the piston a needs enough axial seal space no matter adopting dynamic seal or static seal, and meanwhile, the piston needs to be provided with a cross structure to be hinged with a connection, so that the whole space requirement is large, the swinging angle needs to be limited when the connecting rod f is designed, the center distance between the connecting rod pin d through a hole and the center of the connecting rod f needs to be large, so that the size of the connecting rod f is designed to be long, the connecting rod pin d usually adopts a simple support beam structure in the piston cross structure, the length of the cross structure is increased, a complex machining process is needed to ensure the size process requirement, and the manufacturing cost is relatively large. In addition, when the matching structure of the connecting rod f and the piston a is used for maintenance, the process is complex, meanwhile, the sealing element needs to be replaced in one-time maintenance, and the maintenance cost is high. Due to the contact seal, after a certain lifetime, there is a risk of leakage.

SUMMERY OF THE UTILITY MODEL

The utility model provides a swing piston seal structure, its is used for will rotating the sealed of output for reciprocating motion's connecting rod structure, seal structure is for the rotator structure who possesses the axis, is central disk, cover shape portion and outer dish from inside to outside in proper order, outer dish supports and leans on the base member of swing piston structure internal fixation, central through-hole has been seted up to central disk inside, central disk passes through central through-hole cover is located on the part of swing piston structure internalization, cover shape portion is for possessing the extension seal structure axial displacement perhaps prolongs the rubber membrane structure of center swing deformation.

Preferably, an inner surface of the cap portion is formed with an arc-shaped ring groove recessed in a direction away from the outer disk and the center disk.

As above-mentioned technical scheme's preferred, cover shape portion includes that first deformation ring, second warp the ring, connects first deformation ring reaches the transition ring that the second warp the ring, wherein, first deformation ring with center plate body coupling, the second warp the ring with outer dish body coupling, first deformation ring with the second warp the ring and prolong seal structure's axis direction extends.

Preferably, in the above-described aspect, an axial distance is provided between the center disc and the outer disc in a direction along the axis of the seal structure.

Preferably, as for the above technical solution, a first annular flange is arranged on the end surface of the central disc far away from the outer disc, and a second annular flange is arranged on the end surface of the central disc close to the outer disc.

Preferably, as for the above technical solution, a third annular flange is provided on a side of the outer disc away from the central disc.

Preferably, a clamping groove is formed between the first annular flange and the cover-shaped part.

Preferably, in the technical scheme, the first deformation ring and the central axis of the sealing structure keep a deflection angle of 95-105 degrees.

Preferably, the sealing structure is an integrally formed structure, and the central disc and the cover-shaped part, and the cover-shaped part and the outer disc are in natural transition of arc surfaces.

Preferably, in the above-described aspect, the cross section of the transition ring is circular arc-shaped.

To sum up, the utility model has the advantages of it is following:

compared with the prior art, the sealing element has the advantages that the sealing element only deforms along with the piston when the piston swings, the relative position of the sealing part is kept unchanged, abrasion caused by friction cannot occur, and the service life is longer; the whole structure adopts a lampshade-like structure, the center and the outer edge adopt annular flange structures to play an absolute seal role, the middle part adopts a rubber membrane structure which can relatively deform along with the swinging of the piston, and the sealing principle adopted by the whole sealing structure is isolation type sealing and non-contact type sealing, so that the absolute sealing effect can be played; furthermore, because the eccentric shaft is adopted to drive the connecting rod to move, the connecting rod can swing in the moving process, a certain deflection angle is designed on the adjacent end surface of the cover-shaped part and the piston, the wall surface of the cover-shaped part is prevented from being attached to the connecting shaft sleeve to influence the swinging in the swinging process, and the practical service life of the sealing structure is further shortened;

the benefits of further or other details will be discussed in the examples.

Drawings

FIG. 1 is a schematic diagram of a piston used in the prior art;

FIG. 2 is a schematic view of the seal of the present application mounted on a wobble piston;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is an isometric view of a sealing structure of the present application;

FIG. 5 is a full sectional view of the present application in one orientation of the seal configuration;

FIG. 6 is a full sectional view of another aspect of the seal of the present application

Wherein, 1-center plate, 2-cover shape part, 3-outer plate, 21-first deformation ring, 22-second deformation ring, 23-transition ring, 24-arc ring groove, 11-first ring flange, 12-second ring flange, 13-clamping groove, 31-third ring flange, 9-piston mechanism, 91-chassis, 911-ring groove, 92-eccentric wheel, 93-connecting rod, 931-thin shaft section, 932-thick shaft section, 933-transition surface, 94-connector, 95-coupler, 96-loop rod connector, 951-clamping bulge, a-piston, b-piston seal, c-seal cover plate, d-connecting rod pin, e-O-shaped ring and f-connecting rod.

Detailed Description

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

The invention is further explained below with reference to the following examples:

example (b):

a swing piston sealing structure is disclosed, please refer to fig. 2 to fig. 6, and is applied to a piston mechanism 9 outputting rotation as reciprocating motion, the piston mechanism 9 at least includes a case 91, an eccentric wheel 92, and a connecting rod 93, wherein the eccentric wheel 92 and the connecting rod 93 are disposed inside the case 91, and a rolling bearing is disposed between the connecting rod 93 and the eccentric wheel 92 to form a sliding pair fit, which is a basic swing piston structure, but a sealing structure is required to be disposed to block gear oil inside the case 91 from flowing out to an external environment during the swinging process of the piston, so that the sealing structure of this embodiment is required to block the internal and external environments to form a seal, specifically, the sealing structure is a rotator structure having a central axis, and comprises a central disc 1, a cover-shaped portion 2, and an outer disc 3 from inside to outside in sequence, the outer disc 3 abuts against the inner wall surface of the case 91, a central through hole is formed in the central disc 1, the central disc 1 is sleeved on the connecting rod 93 through the central through hole, and the cover-shaped portion 2 is a rubber film structure moving axially along the sealing structure or swinging and deforming along the central axis.

Specifically, the center plate 1 and the outer plate 3 are provided with an axial distance along the axial direction of the sealing mechanism, that is, the center plate 1 and the outer plate 3 are not on the same horizontal plane, and after being installed on the piston mechanism 9, the outer plate 3 is closer to the eccentric wheel 92 than the center plate 1, one side of the outer plate 3, which is far away from the center plate 1, is provided with a third annular flange 31, the inner side of the case 91 is provided with an annular groove 911, the annular groove 911 is matched with the third annular flange 31, the sealing member is not only abutted against the inner wall surface of the case 91 through the outer edge, but also is clamped in the annular groove 911 in the case 91 through the third annular flange 31, in addition, the piston mechanism 9 further comprises a connector 94, the connector 94 is fixed on the case 91 through screws, the connector 94 is abutted against the outer plate 3 and further presses the third annular flange 31 into the annular groove 911 in the inner side of the case 91, so that the matching between the third annular flange 31 and the annular groove 911 is more tightly improved in sealing performance.

Two annular flanges are arranged on two sides of the central disk 1, wherein the end surface far away from the outer disk 3 is provided with a first annular flange 11, the end surface near the outer disk 3 is provided with a second annular flange 12, the inner diameters of the two annular flanges are the same as the inner diameter of the central disk 1, it can be understood that the contact area between the integral central disk 1 and the connecting rod 93 is increased, so that the connection between the integral central disk 1 and the connecting rod 93 is more stable, however, the first annular flange 11 and the second annular flange 12 have other functions, in fact, the piston mechanism 9 according to the embodiment further comprises a connecting sleeve 95 and a sleeve rod connecting piece 96, the connecting rod 93 is respectively a thick shaft section 932 and a thin shaft section 931 in a stepped manner at two ends, the outer diameter of the thin shaft section 931 is smaller than that of the thick shaft section 932, the aperture of the central through hole is also matched with the shaft diameter of the thin shaft section 931, the shaft diameter of the thick shaft section 932 is the same as that of the coupling sleeve 95, the central disk 1 is sleeved on the thin shaft section 931, the end surface of the second annular flange 12 also abuts against the transition surface 933 of the thin shaft section 931 and the thick shaft section 932, the coupling sleeve 95 is fixedly connected with the connecting rod 93 through the sleeve rod connecting piece 96, and when the coupling sleeve 95 is fixedly connected with the connecting rod 93, the first annular flange 11 abuts against the end surface of the coupling sleeve 95 facing the connecting rod 93, the sleeve rod connecting piece 96 is a fastening screw, after pre-tightening, the coupling sleeve 95 abuts against the first annular flange 11, the second annular flange 12 abuts against the transition surface 933 of the thin shaft section 931 and the thick shaft section 932, the sleeve rod connecting piece 96 is continuously rotated, and the first annular flange 11 and the second annular flange 12 are compressed to form absolute sealing. In addition, be formed with joint groove 13 between first annular flange 11 and the cover shape portion 2, still be provided with joint protrusion 951 on the terminal surface that is close to connecting rod 93 on the axle sleeve 95, work as axle sleeve 95 is connected the cooperation with connecting rod 93 and is accomplished the back, joint protrusion 951 is arranged in joint groove 13, so central disk 1 is at least partially completely blocked dead, under the circumstances of not changeing the elasticity fastening screw, seal structure can't break away from between axle sleeve 95 and the connecting rod 93.

Through the structure, the sealing principle adopted by the whole sealing structure is isolation type sealing instead of non-contact type sealing, so that an absolute sealing effect can be achieved.

Whole seal structure is integrated into one piece's rubber spare, wherein, cover shape portion 2 is the structure of class lamp shade, form one towards keeping away from outer dish 3 and the sunken arc annular 24 of 1 direction of central disk on the medial surface of cover shape portion 2, cover shape portion 2 specifically includes first deformation ring 21, second deformation ring 22, the transition ring 23 of connecting first deformation ring 21 and second deformation ring 22, first deformation ring 21 and 1 body coupling of central disk, second deformation ring 22 and 3 body coupling of outer disk, first deformation ring 21 extends the axis direction of seal structure with second deformation ring 22, all for the arc surface natural transition between cover shape portion 2 and the outer disk 3 between central disk 1 and cover shape portion 2.

More than, when eccentric wheel 92 rotated, connecting rod 93 was reciprocating type swing motion under the effect of revolute pair, and cover shape portion 2 can prolong the axial and carry out reciprocating flexible deformation motion this moment, because cover shape portion 2 possesses certain flexibility and each diversion department all is the circular arc transition simultaneously, so possesses very high fatigue life, because there is gear oil in quick-witted case 91 inside, the rubber membrane is strutted under the effect of gear oil, more can fully guarantee this flexible plumpness that warp.

Furthermore, because the connecting rod 93 swings to a certain degree, the first deformation ring 21 and the central axis of the sealing structure keep a deflection angle of 95 to 105 degrees, the swing angle of the connecting rod 93 is compensated, the wall surface of the first deformation ring 21 is prevented from being attached to the connecting shaft sleeve 95 to affect swinging in the swinging process, and the service life of the sealing structure is further shortened.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a swing piston seal structure, its is used for will rotating the output and be reciprocating motion's the sealed of connecting rod structure, a serial communication port, seal structure is for the rotator structure who possesses the axis, is central disk, cover shape portion and outer dish from inside to outside in proper order, the outer dish supports and leans on the base member of swing piston structure internal fixation, central through-hole has been seted up to central disk inside, central disk passes through central through-hole cover is located on the part of swing piston structure internalization, cover shape portion is for possessing the extension seal structure axial displacement perhaps prolongs the rubber membrane structure of center swing deformation.

2. A rocking piston seal structure according to claim 1, characterised in that the inner side of the cup-shaped portion is formed with an arcuate annular groove recessed away from the outer disc and the central disc.

3. The structure of claim 1 or 2, wherein the cap includes a first deformation ring, a second deformation ring, and a transition ring connecting the first deformation ring and the second deformation ring, wherein the first deformation ring is integrally connected to the central plate, the second deformation ring is integrally connected to the outer plate, and the first deformation ring and the second deformation ring extend along the axial direction of the sealing structure.

4. An oscillating piston seal structure as defined in claim 1 wherein said central disc and said outer disc are provided with an axial spacing along the axis of said seal structure.

5. An oscillating piston seal according to claim 4, characterised in that the end face of the central disc remote from the outer disc is provided with a first annular flange and the end face of the central disc adjacent the outer disc is provided with a second annular flange.

6. A rocking piston seal according to claim 4, characterised in that the side of the outer disc remote from the central disc is provided with a third annular flange.

7. The oscillating piston seal structure of claim 5 wherein a snap groove is formed between said first annular flange and said cap portion.

8. The oscillating piston seal structure of claim 3, wherein the first deformation ring and the central axis of the seal structure keep a deflection angle of 95-105 degrees.

9. A rocking piston seal according to claim 1, characterised in that the seal is an integrally formed structure and there is a natural transition between the central disc and the cap and between the cap and the outer disc in the form of a circular arc.

10. A rocking piston seal according to claim 3, characterised in that the transition ring is circular in cross-section.

Images