CN210829969U - Multistage piston ring sealing structure - Google Patents

Abstract

The utility model discloses a multistage piston ring seal structure, including cylinder, first piston rod, second piston rod, third piston rod, first piston ring, second piston ring and third piston ring, the figure of first piston ring, second piston ring and third piston ring is three, the hydro-cylinder pipeline has all been seted up on first piston rod, second piston rod and the third piston rod, just three seal groove has all been seted up on first piston rod, second piston rod and the third piston rod. A multistage piston ring seal structure, when wearing and tearing appear in the outer wall of first piston ring body, make the outer wall of first piston ring body hug closely the inner wall of cylinder through elasticity, like the same thing for keep sealed between first piston rod and the second piston rod, and elasticity through compression spring and second elastic ring makes the outer wall of second piston ring body hug closely the second piston rod, has improved multistage hydraulic cylinder's leakproofness.

Description

Multistage piston ring sealing structure

Technical Field

The utility model relates to a piston ring field, in particular to multistage piston ring seal structure.

Background

The multistage hydraulic cylinder is formed by two-stage or multistage piston cylinder suit, also known as telescoping cylinder, often use in the installation space little and the very long occasion of stroke requirement, the order that the piston stretches out among the multistage cylinder is from big to little, hydraulic oil passes through the cylinder central line and directly gets into rodless chamber, under the effect of inside oil pressure, the biggest first level piston rod of diameter stretches out at first, then second level and third level piston rod stretch out in proper order, when the input flow is the same, the overhanging speed increases gradually, when the load is constant, the operating pressure of pneumatic cylinder increases gradually, because the structure of multistage hydraulic cylinder has decided the piston rod and also be the jar for the pole, and the journey is long, traditional piston utilizes the piston ring to seal usually, but permanent use, the piston ring appears wearing and tearing, and then influences the leakproofness.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a multistage piston ring seal structure, can effectively solve traditional piston and utilize the piston ring to seal usually among the background art, nevertheless permanent use, wearing and tearing appear in the piston ring, and then influence the problem of leakproofness.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multi-stage piston ring sealing structure comprises a cylinder barrel, a first piston rod, a second piston rod, a third piston rod, a first piston ring, a second piston ring and a third piston ring, wherein the number of the first piston ring, the number of the second piston rod and the number of the third piston ring are three, oil cylinder pipelines are respectively arranged on the first piston rod, the second piston rod and the third piston rod, three sealing grooves are respectively arranged on the first piston rod, the first piston ring is arranged in the sealing groove on the first piston rod, the first piston ring comprises a first piston ring body, a first opening gap is arranged on the first piston ring body, first annular grooves are symmetrically arranged on two sides of the first piston ring body, a first elastic ring is arranged in each first annular groove, and a first limiting ring is fixedly connected to the side wall of each first annular groove, one side of first spacing ring contacts with one side of first elastic ring, the second piston ring sets up in the seal groove on the second piston rod, the third piston ring sets up in the seal groove on the third piston rod, the third piston ring includes second piston ring body, second opening gap has been seted up to the second piston ring body, the bilateral symmetry of second piston ring body has seted up third annular groove, be equipped with the second elastic ring in the third annular groove, the inner wall of third annular groove is equipped with the second spacing ring, the second spacing ring contacts with the second elastic ring, be equipped with elastic mechanism on the second piston ring body.

Preferably, the first piston ring and the second piston ring have the same structure, and the outer diameter of the first piston ring is larger than that of the second piston ring.

Preferably, the first elastic ring and the second elastic ring are both of an L-shaped structure, one side of the inner wall, close to the outer wall of the first piston ring body, of the first annular groove is in contact with one side of the first elastic ring, one side of the inner wall, close to the outer wall of the second piston ring body, of the third annular groove is in contact with one side of the second elastic ring, and one side of the inner wall of the third annular groove is in contact with one side of the second elastic ring.

Preferably, the elastic mechanism comprises a fixing ring arranged on the inner wall of the second piston ring body, a second annular groove is formed in the inner wall of the second piston ring body, a plurality of arc-shaped clamping plates are arranged on the inner wall, away from the fixing ring, of one side of the second annular groove, and the arc-shaped clamping plates are connected with the fixing ring through compression springs.

Preferably, the outer wall of the fixing ring is fixedly connected with the inner wall of the second piston ring body, and one side of the arc-shaped clamping plate is in contact with the inner wall of the second annular groove.

Compared with the prior art, the utility model discloses following beneficial effect has: through setting up first piston ring body, first annular groove, the mating reaction of first elastic ring and spacing ring, when wearing and tearing appear in the outer wall of first piston ring body, make the inner wall of cylinder is hugged closely to the outer wall of first piston ring body through elasticity, the reduction of leakproofness has been avoided, the same thing, through the second piston ring that sets up, make and keep sealed between first piston rod and the second piston rod, through setting up third annular groove, the second elastic ring, the spacing ring, the mating reaction of second piston ring body and elastic mechanism, when wearing and tearing appear in the outer wall of second piston ring body, elasticity through compression spring and second elastic ring, make the outer wall of second piston ring body hug closely the second piston rod, and then make and keep sealed between second piston rod and the third piston rod, multistage hydraulic cylinder's leakproofness has been improved.

Drawings

Fig. 1 is a schematic structural view of a first piston ring of a multi-stage piston ring sealing structure of the present invention;

fig. 2 is a schematic view of the overall structure of the multi-stage piston ring sealing structure of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic structural view of a third piston ring of the multi-stage piston ring sealing structure of the present invention;

fig. 5 is a partially enlarged schematic view of a portion B in fig. 4.

In the figure: 1. a cylinder barrel; 2. a first piston rod; 3. a second piston rod; 4. a third piston rod; 5. a cylinder pipe; 6. a fixing ring; 7. a compression spring; 8. a sealing groove; 9. a first piston ring; 10. a second piston ring; 11. a third piston ring; 12. a first opening gap; 13. a first piston ring body; 14. a first annular groove; 15. a first limit ring; 16. a first elastic ring; 17. a second elastic ring; 18. a second opening gap; 19. a second piston ring body; 20. a second annular groove; 21. an arc-shaped clamping plate; 22. a second stop collar; 23. a third annular groove.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-5, a multi-stage piston ring sealing structure comprises a cylinder barrel 1, a first piston rod 2, a second piston rod 3, a third piston rod 4, a first piston ring 9, a second piston ring 10 and a third piston ring 11, wherein the number of the first piston ring 9, the second piston ring 10 and the third piston ring 11 is three, the first piston rod 2, the second piston rod 3 and the third piston rod 4 are all provided with a cylinder pipeline 5, the first piston rod 2, the second piston rod 3 and the third piston rod 4 are all provided with three sealing grooves 8, the first piston ring 9 is arranged in the sealing groove 8 on the first piston rod 2, the first piston ring 9 comprises a first piston ring body 13, the first piston ring body 13 is provided with a first opening gap 12, two sides of the first piston ring body 13 are symmetrically provided with first annular grooves 14, a first elastic ring 16 is arranged in the first annular groove 14, a first limit ring 15 is fixedly connected to the side wall of the first annular groove 14, one side of the first limit ring 15 is in contact with one side of a first elastic ring 16, a second piston ring 10 is arranged in a sealing groove 8 on the second piston rod 3, a third piston ring 11 is arranged in a sealing groove 8 on the third piston rod 4, the third piston ring 11 comprises a second piston ring body 19, a second opening gap 18 is formed in the second piston ring body 19, third annular grooves 23 are symmetrically formed in two sides of the second piston ring body 19, a second elastic ring 17 is arranged in each third annular groove 23, a second limit ring 22 is arranged on the inner wall of each third annular groove 23, the second limit ring 22 is in contact with the second elastic ring 17, and an elastic mechanism is arranged on each second piston ring body 19;

the first piston ring 9 and the second piston ring 10 have the same structure, and the outer diameter of the first piston ring 9 is larger than that of the second piston ring 10; the first elastic ring 16 and the second elastic ring 17 are both of L-shaped structures, the inner wall of one side of the first annular groove 14 close to the outer wall of the first piston ring body 13 is contacted with one side of the first elastic ring 16, the inner wall of one side of the first annular groove 14 is contacted with one side of the first elastic ring 16, the inner wall of one side of the third annular groove 23 close to the outer wall of the second piston ring body 19 is contacted with one side of the second elastic ring 17, and the inner wall of one side of the third annular groove 23 is contacted with one side of the second elastic ring 17; the elastic mechanism comprises a fixing ring 6 arranged on the inner wall of a second piston ring body 19, a second annular groove 20 is formed in the inner wall of the second piston ring body 19, a plurality of arc-shaped clamping plates 21 are arranged on the inner wall of one side, away from the fixing ring 6, of the second annular groove 20, and the arc-shaped clamping plates 21 are connected with the fixing ring 6 through compression springs 7; the outer wall of the fixed ring 6 is fixedly connected with the inner wall of the second piston ring body 19, and one side of the arc-shaped clamping plate 21 is in contact with the inner wall of the second annular groove 20.

It should be noted that, the utility model relates to a multi-stage piston ring sealing structure, when in use, the first piston rod 2 slides relative to the cylinder barrel 1, along with the increase of the sliding times of the first piston rod 2, the outer wall of the first piston ring body 13 is worn, and a gap appears between the outer wall of the first piston ring body 13 and the cylinder barrel 1, and then the first elastic ring 16 drives the two sides of the outer wall of the first piston ring body 13 to cling to the cylinder barrel 1 through elastic force, so as to reduce the influence of the outer wall wear of the first piston ring body 13 on the sealing performance, because the structures of the first piston ring 9 and the second piston ring 10 are equal, similarly, the sealing performance between the first piston rod 2 and the second piston rod 3 is ensured, when the third piston rod 4 slides relative to the second piston rod 3, along with the increase of the sliding times of the third piston rod 4, and then the outer wall of the second piston ring body 19 is worn, a gap appears between, and then second piston ring 17 orders about the outer wall both sides of second piston ring body 19 through elasticity and hugs closely second piston rod 3, and compression spring 7 presses arc cardboard 21 through elasticity simultaneously, and then makes second piston ring body 19 hug closely second piston rod 3, through the elasticity of second elastic ring 17 and compression spring 7 for second piston ring body 19 hugs closely second piston rod 3 all the time, and then reduces the influence of piston ring wearing and tearing to multistage hydraulic cylinder leakproofness.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. The utility model provides a multistage piston ring seal structure, includes cylinder (1), first piston rod (2), second piston rod (3), third piston rod (4), first piston ring (9), second piston ring (10) and third piston ring (11), its characterized in that: the number of the first piston ring (9), the number of the second piston ring (10) and the number of the third piston ring (11) are three, the first piston rod (2), the second piston rod (3) and the third piston rod (4) are all provided with an oil cylinder pipeline (5), the first piston rod (2), the second piston rod (3) and the third piston rod (4) are all provided with three sealing grooves (8), the first piston ring (9) is arranged in the sealing groove (8) on the first piston rod (2), the first piston ring (9) comprises a first piston ring body (13), the first piston ring body (13) is provided with a first opening gap (12), two sides of the first piston ring body (13) are symmetrically provided with first annular grooves (14), first elastic rings (16) are arranged in the first annular grooves (14), and the side walls of the first annular grooves (14) are fixedly connected with first limiting rings (15), one side of the first limit ring (15) is contacted with one side of the first elastic ring (16), the second piston ring (10) is arranged in a sealing groove (8) on the second piston rod (3), the third piston ring (11) is arranged in a sealing groove (8) on the third piston rod (4), the third piston ring (11) comprises a second piston ring body (19), the second piston ring body (19) is provided with a second opening gap (18), third annular grooves (23) are symmetrically formed in two sides of the second piston ring body (19), a second elastic ring (17) is arranged in the third annular groove (23), a second limiting ring (22) is arranged on the inner wall of the third annular groove (23), the second limiting ring (22) is in contact with the second elastic ring (17), and an elastic mechanism is arranged on the second piston ring body (19).

2. A multi-stage piston ring seal structure according to claim 1, wherein: the first piston ring (9) and the second piston ring (10) are identical in structure, and the outer diameter of the first piston ring (9) is larger than that of the second piston ring (10).

3. A multi-stage piston ring seal structure according to claim 1, wherein: the first elastic ring (16) and the second elastic ring (17) are both L-shaped structures, one side inner wall of the first annular groove (14) close to the outer wall of the first piston ring body (13) is in contact with one side of the first elastic ring (16), one side inner wall of the first annular groove (14) is in contact with one side of the first elastic ring (16), one side inner wall of the third annular groove (23) close to the outer wall of the second piston ring body (19) is in contact with one side of the second elastic ring (17), and one side inner wall of the third annular groove (23) is in contact with one side of the second elastic ring (17).

4. A multi-stage piston ring seal structure according to claim 1, wherein: the elastic mechanism comprises a fixing ring (6) arranged on the inner wall of a second piston ring body (19), a second annular groove (20) is formed in the inner wall of the second piston ring body (19), a plurality of arc-shaped clamping plates (21) are arranged on the inner wall, far away from the fixing ring (6), of one side of the second annular groove (20), and the arc-shaped clamping plates (21) are connected with the fixing ring (6) through compression springs (7).

5. A multi-stage piston ring seal structure according to claim 4, wherein: the outer wall of the fixing ring (6) is fixedly connected with the inner wall of the second piston ring body (19), and one side of the arc-shaped clamping plate (21) is in contact with the inner wall of the second annular groove (20).

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