CN214366621U

CN214366621U - Combined piston ring

Info

Publication number: CN214366621U
Application number: CN202120595064.6U
Authority: CN
Inventors: 王春; 李文斌; 翟美辰
Original assignee: Anshan Libang Compressors Co ltd
Current assignee: Anshan Libang Compressors Co ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-10-08
Anticipated expiration: 2031-03-24

Abstract

The utility model belongs to the field of piston type internal combustion engines, air compressors and piston pumps, in particular to a combined piston ring, which is characterized by comprising an outer ring group and an inner ring group, wherein the outer ring group is formed by stacking a ring I, a ring II and a ring III, and the inner ring group is formed by an elastic rubber ring; the first ring, the second ring and the third ring are provided with oblique notches, and the oblique notches among the three rings are staggered; the second ring is a T-shaped integrated structure consisting of a main ring body and a fin ring body; the first ring, the second ring and the third ring are connected through fixing pins. Compared with the prior art, the beneficial effects of the utility model are that: 1) the large self-lubricating wear reserve of the thick non-metal piston ring is reserved, and the piston ring is more elastic than the integral non-metal piston ring; 2) the inner ring set can tightly tension the outer ring set, thereby achieving good sealing effect. 3) The fixed pin can make more simple accurate when assembling, reduces the assembly degree of difficulty, improves piston assembly's assembly efficiency, practices thrift the man-hour cost.

Description

Combined piston ring

Technical Field

The utility model belongs to piston internal-combustion engine, air compressor machine, piston pump field, a modular piston ring that uses in the concretely relates to piston compression machinery.

Background

The piston compressor is a compressor which can make gas be pressurized and transferred by means of reciprocating motion of piston, belonging to volume type compressor, also called reciprocating piston compressor or reciprocating compressor, mainly consisting of working cavity, driving component, machine body and auxiliary component, the working cavity can be directly used for compressing gas, and is formed from cylinder, cylinder sleeve, gas valve, filler, piston and piston rod. The performance index of reciprocating piston internal combustion engine has been greatly improved after the development of more than a century, so far the thermal efficiency of internal combustion engine has reached about 40%, but the thermal loss is about 60%. At present, energy conservation and emission reduction are still urgent in all countries all over the world, and a piston ring is one of key parts influencing the sealing performance of an internal combustion engine.

The piston and the piston ring bear high temperature, high pressure and high speed in the working process of the cylinder, the working conditions are quite severe, and the important efforts for improving the sealing performance of the piston ring and reducing the friction loss of a kinematic pair are important. Wherein, the number of piston rings is reduced; the structural shape of the opening of the piston ring is improved; changing the structural profile of the contact surface of the piston ring with the cylinder sleeve and the piston; the materials, the process and the light weight of the piston, the piston ring and the cylinder sleeve are improved; reducing the pressure of the piston ring against the inner wall surface of the cylinder, etc., is an effective method for reducing the frictional resistance and reducing the wear.

The piston used in the existing piston type internal combustion engine and air compressor usually has two or more gas ring grooves, each gas ring groove is usually equipped with only one piston ring, and the piston ring is opened with an opening. When the single-groove single-ring structure works, a straight-through channel exists at the opening of the piston ring and the cylinder wall; although the directions of the openings of the piston rings are staggered when the piston rings are installed, the sealing performance of the piston is still poor, air leakage is easy to occur, the air consumption of the internal combustion engine is increased, a lot of energy is consumed, the working efficiency of the engine is influenced to a certain extent, and particularly after the piston rings are used for a period of time, the abrasion loss is increased continuously, and the defect is more obvious.

Disclosure of Invention

The utility model aims at providing a modular piston ring overcomes prior art's is not enough, adopts the integrated configuration of outside ring group and inboard ring group, and outside ring group provides lubricated wearing and tearing, and inboard ring group provides elastic support, makes the inner wall reliable laminating of outside ring and piston cylinder, reduces gas leakage, and the relative position of multilayer ring body can be guaranteed to the fixed pin, reduces the assembly degree of difficulty, makes the motion performance of piston remain stable.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

a combined piston ring is characterized by comprising an outer ring group and an inner ring group, wherein the outer ring group is formed by stacking a ring I, a ring II and a ring III, and the inner ring group consists of 1-3 elastic rubber rings; the first ring, the second ring and the third ring are provided with oblique notches, and the oblique notches among the three rings are staggered; the second ring is a T-shaped integrated structure consisting of a main ring body and a fin ring body, and open spaces capable of accommodating the first ring or the third ring are respectively formed between the upper side of the fin ring body and the main ring body and between the lower side of the fin ring body and the main ring body; the outer side surfaces of the first ring, the fin ring body and the third ring form a sealing surface together after the outer side ring group is combined; the first ring, the second ring and the third ring are connected through fixing pins.

Furthermore, the sections of the first ring and the third ring are any one of rectangles, right-angled trapezoids or right-angled triangles and are attached to the contact surfaces of the main ring body and the fin ring body.

Further, the height of the open space on the upper side of the fin ring body may be the same as or different from the height of the open space on the lower side of the fin ring body.

Further, the elastic rubber ring is any one of an O-shaped ring, a rectangular ring, a Y-shaped ring or a V-shaped ring.

Furthermore, the contact surfaces between the first ring and the second ring and/or between the second ring and the third ring are provided with mutually meshed rabbets.

Further, be equipped with the mating holes that matches with the fixed pin on ring one and the ring three, the mating holes is the complete round hole of hole shape, or for opening open-ended opening inwards, the mating holes is the blind hole.

Furthermore, the fixing pin is matched with the ring two through threads or is connected with the ring two through interference fit.

Compared with the prior art, the beneficial effects of the utility model are that: 1) the combined piston ring adopts a combined structure of an outer side ring set and an inner side ring set, the outer side ring set provides lubricating wear, the inner side ring set provides elastic support, and the outer side ring set is divided into three thinner rings to be combined together, so that the larger self-lubricating wear reserve of a thick non-metal piston ring is reserved, and the combined piston ring has more elasticity than the integral non-metal piston ring; 2) the inner ring set is a rubber elastic ring, and the outer ring set can be tensioned by the elasticity of the inner ring set so as to be tightly pressed on the inner wall of the cylinder barrel, thereby achieving good sealing effect. 3) The fixed pin can make this combination formula piston ring simpler accurate when the assembly, reduces the assembly degree of difficulty, improves piston assembly's assembly efficiency, practices thrift the man-hour cost.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is an exploded view of the outer ring assembly in accordance with an embodiment of the present invention;

fig. 3 is a schematic view of the first ring, the second ring and the third ring in the embodiment of the present invention, in which the cross-sections of the first ring and the second ring are not rectangular, but right trapezoid and right triangle.

Fig. 4 is a schematic structural view of the embodiment of the present invention in which the contact surfaces between the first ring, the second ring and the third ring have the seam allowance, but the direction of the seam allowance is not limited.

In the figure: 1-ring I, 2-ring II, 3-ring III, 4-elastic rubber ring, 5-fixed pin, 201-main ring body, 202-wing ring body, 6-piston and 7-cylinder barrel.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments:

in the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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 be referred 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.

Fig. 1-2 show a schematic structural view of an embodiment of a combined piston ring according to the present invention, which includes an outer ring set and an inner ring set, and the outer ring set and the inner ring set are disposed in an air ring groove of a piston 6, wherein the outer ring set is formed by stacking a ring one 1, a ring two 2, and a ring three 3, and the inner ring set is formed by 2 elastic rubber rings 4; oblique notches are formed in the first ring 1, the second ring 2 and the third ring 3, and the oblique notches among the three rings are staggered by an included angle of 120 degrees; the second ring 2 is a T-shaped integrated structure consisting of a main ring body 201 and a fin ring body 202, and open spaces capable of accommodating the first ring 1 or the third ring 3 are respectively formed between the upper side of the fin ring body 202 and the main ring body 201 and between the lower side of the fin ring body 202 and the main ring body 201; the outer side surfaces of the outer side ring group combined rear ring I1, the fin ring body 202 and the ring III 3 form a sealing surface between the piston 6 and the cylinder barrel 7; the first ring 1, the second ring 2 and the third ring 3 are connected through two fixing pins 5, the fixing pins 5 can prevent relative rotation of the ring bodies, the cuts are not overlapped with each other, leakage can be effectively prevented, and the sealing performance of the piston assembly is improved. The utility model discloses can regard as taking incision ring and oblique incision ring's synthesis, modification and improvement, compare in traditional single oblique incision piston ring or general overlap joint piston ring, in the axial with the crisscross superpose combination of three oblique incision ring body together, the incision staggers each other, utilizes ring one and ring three to block gaseous through the oblique incision of ring two along the route of radial leakage, compressed gas can not directly leak. The air flow needs to be blocked and sealed for many times, the leakage amount is greatly reduced, and the combined piston ring has the advantages of simple manufacture of the oblique-notch piston ring and the advantages of small leakage amount and good sealing performance of the overlap-joint piston ring.

In the embodiment, the elastic rubber ring 4 is composed of 2O-shaped rings. The first ring 1 and the third ring 3 are rectangular in section and are attached to the contact surfaces of the main ring body 201 and the fin ring body 202. The height of the open space on the upper side of the fin ring body 202 is the same as the height of the open space on the lower side of the fin ring body 202. And the first ring 1 and the third ring 3 are provided with matching holes 6 matched with the fixing pins 5, the matching holes 6 are opening holes which are inward, and the opening holes are blind holes.

Fig. 3 is a schematic view of the first ring, the second ring and the third ring in the embodiment of the present invention, in this structure, the cross sections of the first ring and the second ring are not rectangular, but are right trapezoid and right triangle, that is, the cross sections of the first ring and the second ring may be different, and this structure may make the combined sealing ring have the characteristics different from the rectangular cross section.

See fig. 4, which is a schematic structural diagram of the embodiment of the present invention, in which the contact surfaces between the first ring, the second ring and the third ring have rabbets, and the rabbets engaged with each other are disposed between the first ring 1 and the second ring 2 and on the contact surfaces between the second ring 2 and the third ring 3, so that the structure can be used to make the wear amounts of the ring bodies consistent.

The elastic rubber ring 4 in the above embodiment may be any one of a rectangular ring, a Y-shaped ring or a V-shaped ring. The fixing pin 5 is matched with the second ring 2 through threads or connected with the second ring 2 through interference fit. The material of the first ring 1, the second ring 2 and the third ring 3 is polytetrafluoroethylene or carbon powder polytetrafluoroethylene, and the polytetrafluoroethylene or carbon powder polytetrafluoroethylene is used in an oil-free air compressor.

The above is only the specific implementation manner of the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, and according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be included in the protection scope of the present invention.

Claims

1. A combined piston ring is characterized by comprising an outer ring group and an inner ring group, wherein the outer ring group is formed by stacking a ring I, a ring II and a ring III, and the inner ring group consists of 1-3 elastic rubber rings; the first ring, the second ring and the third ring are provided with oblique notches, and the oblique notches among the three rings are staggered; the second ring is a T-shaped integrated structure consisting of a main ring body and a fin ring body, and open spaces capable of accommodating the first ring or the third ring are respectively formed between the upper side of the fin ring body and the main ring body and between the lower side of the fin ring body and the main ring body; the outer side surfaces of the first ring, the fin ring body and the third ring form a sealing surface together after the outer side ring group is combined; the first ring, the second ring and the third ring are connected through fixing pins.

2. A composite piston ring according to claim 1, wherein said ring one and ring three are of any one of rectangular, right trapezoid or right triangle cross-section and are adapted to engage the contact surfaces of the main ring body and the fin ring body.

3. A composite piston ring as set forth in claim 1 wherein said open spaces on the upper side of the fin ring body are of the same or different height than said open spaces on the lower side of the fin ring body.

4. The assembled piston ring as set forth in claim 1 wherein said elastomeric ring is any one of an O-ring, a rectangular ring, a Y-ring or a V-ring.

5. A composite piston ring according to claim 1, wherein the first ring and the second ring and/or the second ring and the third ring have mutually engaging spigots on their contact surfaces.

6. The assembled piston ring as claimed in claim 1, wherein said first and third rings have mating holes for receiving the fixing pins, said mating holes are circular holes with complete hole shapes, or are open holes opened inward, and the mating holes are blind holes.

7. A composite piston ring according to claim 1, wherein said retaining pin is threadedly engaged with the ring collar or is attached thereto by interference fit.