CN211501122U

CN211501122U - Piston type energy accumulator

Info

Publication number: CN211501122U
Application number: CN202020021446.3U
Authority: CN
Inventors: 何东泽; 欧林华; 杨盛; 曾华; 刘俊
Original assignee: Wuxi Peak Hydraulic Co ltd; Sunward Intelligent Equipment Co Ltd
Current assignee: Wuxi Peak Hydraulic Co ltd; Sunward Intelligent Equipment Co Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-09-15
Anticipated expiration: 2030-01-06

Abstract

The utility model discloses a piston energy accumulator, include the cylinder body and set up the piston in the cylinder body, the piston will air cavity and oil pocket are separated into to the cylinder body, be equipped with one main seal ring channel and twice sealed ring channel on the piston, the main seal ring channel is located twice between the inferior sealed ring channel, be equipped with the main seal circle in the main seal ring channel, inferior sealing washer is equipped with in the inferior sealing ring channel. The utility model discloses when piston accumulator is in high pressure operating condition, utilize the sealed block part that inferior sealing washer and cylinder inner wall formed to come from the high-pressure oil gas of air inlet or oil inlet, then rely on the main seal circle to carry out two way seal, make it possess stable oil gas sealing performance. Therefore, the internal leakage problem of the piston type energy accumulator is effectively solved.

Description

Piston type energy accumulator

Technical Field

The utility model relates to an energy-conserving excavator hydraulic component technical field especially relates to a piston accumulator.

Background

The piston accumulator is a common hydraulic energy storage device in a hydraulic system of an energy-saving excavator, converts hydraulic energy in the hydraulic system into gas compression energy at proper time for storage, and converts the gas compression energy into hydraulic energy for release when the system needs, so as to supply the hydraulic system. When the system pressure is increased instantaneously, it can absorb this energy to ensure the pressure of the whole system is normal.

The piston accumulator product ubiquitous internal leakage problem at present, because the permeability of gas is stronger than the permeability of liquid, the gas of air cavity can slowly leak to the oil pocket to cause the air cavity pressure to descend, after sales market service needs often to inflate, the pressure compensating for piston accumulator, and the maintenance cycle is short, and use cost is high, and hydraulic system reliability is low, has become the key problem that influences piston accumulator normal use.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, one of the purposes of the present invention is to provide a piston accumulator with stable oil-gas sealing performance, high pressure resistance and simple structure.

In order to solve the technical problem, the following technical scheme is adopted in the application:

the piston type energy accumulator comprises a cylinder body and a piston arranged in the cylinder body, wherein the piston divides the cylinder body into an air cavity and an oil cavity, the piston is provided with a main sealing annular groove and two secondary sealing annular grooves, the main sealing annular groove is located between the secondary sealing annular grooves, a main sealing ring is arranged in the main sealing annular groove, and a secondary sealing ring is arranged in the secondary sealing annular groove.

Further, the cylinder body comprises a top cover, a cylinder barrel and a bottom cover, the top cover is fixed to the top end of the cylinder barrel, the bottom cover is fixed to the bottom end of the cylinder barrel, the top cover is provided with an air inlet, and the bottom cover is provided with an oil inlet.

Furthermore, the bottom of the piston is provided with a boss, and the top of the bottom cover is provided with a groove which is matched with the boss to form an annular buffer gap.

Furthermore, the top cover and the bottom cover are in butt joint with the cylinder barrel through flange plates.

Further, the piston is made of high-strength aluminum alloy.

Compared with the prior art, the utility model has the advantages of:

1. when the piston type energy accumulator is in a middle-low pressure working state, an air cavity or oil cavity seal is formed by the secondary sealing ring and the inner wall of the cylinder barrel, and meanwhile, the secondary seal of the air cavity or the oil cavity is formed by the main sealing ring and the inner wall of the cylinder barrel; when the piston type energy accumulator is in a high-pressure working state, the secondary sealing ring and the sealing blocking part formed on the inner wall of the cylinder body are used for sealing high-pressure oil gas from the air inlet or the oil inlet, and then the main sealing ring is used for carrying out bidirectional sealing, so that the piston type energy accumulator has stable oil gas sealing performance. Therefore, the internal leakage problem of the piston type energy accumulator is effectively solved.

2. The piston is made of high-strength aluminum alloy materials, the wear resistance is good, the density is low, the impact potential energy in the piston stroke motion can be reduced, an annular gap type buffer structure is arranged between the piston and the bottom cover, the piston can be effectively prevented from colliding with the bottom cover, the noise is reduced, and the reliability and the stability of the piston type energy accumulator are improved.

3. The top cover and the bottom cover are fixed at two ends of the cylinder barrel through the hexagon socket head cap screws in a flange plate mode, and the cylinder barrel is simple in structure, convenient to process, free of process difficulty and convenient to assemble and maintain.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a top view of the present invention;

fig. 3 is a bottom view of the present invention;

fig. 4 is an enlarged schematic view of the middle sealing structure of the present invention.

In the figure: 1. a top cover; 2. a socket head cap screw; 3. an O-shaped sealing ring; 4. a retainer ring; 5. a cylinder barrel; 6. an anti-fouling ring; 7. a guide ring; 8. a secondary seal ring; 9. a primary seal ring; 10. a piston; 11. a bottom cover; 12. an oil inlet; 13. an oil chamber; 14. an air cavity; 15. an air inlet; 16. a primary sealing annular groove; 17. a secondary sealing ring-shaped groove; 18. a boss; 19. and (4) a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, a piston accumulator comprises a cylinder body and a piston 10 slidably disposed in the cylinder body, the piston 10 divides the cylinder body into an air cavity 14 and an oil cavity 15, the piston 10 is provided with a primary sealing annular groove 16 and two secondary sealing annular grooves 17, the primary sealing annular groove 16 is located between the two secondary sealing annular grooves 17, a primary sealing ring 9 is disposed in the primary sealing annular groove 16, a secondary sealing ring 8 is disposed in the secondary sealing annular groove 17, and the primary sealing ring 9 and the secondary sealing ring 8 form a sealing combination to provide efficient high-pressure-resistant sealing performance.

Specifically, the cylinder body comprises a top cover 1, a cylinder barrel 5 and a bottom cover 11, wherein the top cover 1 is fixed at the top end of the cylinder barrel 5 through an inner hexagonal socket head cap screw 2, similarly, the bottom cover 11 is fixed at the bottom end of the cylinder barrel 5 through the inner hexagonal socket head cap screw 2, an O-shaped sealing ring 3 and a retainer ring 4 for static sealing are arranged on the top cover 1 and the bottom cover 11, a piston 10 is positioned between the top cover 1 and the bottom cover 11 and separates and seals the cylinder barrel 5 into an air cavity 14 and an oil cavity 13, a sealing annular groove 17 of one pass is arranged close to the top cover 1, a sealing annular groove 17 of the other pass is arranged close to the bottom cover 11, and.

The utility model discloses a theory of operation is: when the piston type energy accumulator is in a medium-low pressure working state, an air cavity 14 or an oil cavity 13 is formed by the secondary sealing ring 8 and the inner wall of the cylinder barrel 5 for sealing, and meanwhile, the primary sealing ring 9 and the inner wall of the cylinder barrel 5 form secondary sealing of the air cavity 14 or the oil cavity 13; when the piston type energy accumulator is in a high-pressure working state, the secondary sealing ring 8 and the inner wall of the cylinder barrel 5 form a sealing blocking part for high-pressure oil gas from the air inlet 15 or the oil inlet 12, and then the main sealing ring 9 is used for carrying out bidirectional sealing, so that the piston type energy accumulator has stable oil gas sealing performance. Therefore, the internal leakage problem of the piston type energy accumulator is effectively solved.

In some embodiments, the piston 10 is made of high-strength aluminum alloy material, has good wear resistance and low density, and can reduce the impact potential energy in the stroke motion of the piston 10.

Referring to fig. 1, it can be understood that a boss 18 may be further provided at the bottom of the piston, and a groove 19 cooperating with the boss to form an annular cushion gap structure is correspondingly provided at the top of the bottom cap 11. In this embodiment, an annular gap type buffer structure is arranged between the piston 10 and the bottom cover 11, so that the piston can be effectively prevented from colliding with the bottom cover, noise is reduced, and reliability and stability of the piston type energy accumulator are improved.

Specifically, the top cover 1 and the bottom cover 11 are fixed at two ends of the cylinder barrel 5 through the hexagon socket head cap screws 2 in a flange plate mode, the structure is simple, the processing is convenient, the process difficulty is avoided, and the assembly and the maintenance are convenient.

The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims

1. The utility model provides a piston accumulator, includes the cylinder body and sets up piston (10) in the cylinder body, piston (10) will the cylinder body is separated into air cavity (14) and oil pocket (13), its characterized in that: the piston (10) is provided with a primary sealing annular groove (16) and two secondary sealing annular grooves (17), the primary sealing annular groove (16) is located between the secondary sealing annular grooves (17), a primary sealing ring (9) is arranged in the primary sealing annular groove (16), and a secondary sealing ring (8) is arranged in the secondary sealing annular groove (17).

2. The piston accumulator of claim 1, wherein: the cylinder body includes top cap (1), cylinder (5) and bottom (11), top cap (1) is fixed in cylinder (5) top, bottom (11) are fixed in cylinder (5) bottom, be equipped with air inlet (15) on top cap (1), be equipped with oil inlet (12) on bottom (11).

3. The piston accumulator of claim 2, wherein: the bottom of the piston (10) is provided with a boss (18), and the top of the bottom cover (11) is provided with a groove (19) which is matched with the boss (18) to form an annular buffer gap.

4. The piston accumulator according to claim 2 or 3, characterized in that: the top cover (1) and the bottom cover (11) are in butt joint with the cylinder barrel (5) through flanges.

5. The piston accumulator according to claim 2 or 3, characterized in that: the piston (10) is made of high-strength aluminum alloy.

6. The piston accumulator according to claim 2 or 3, characterized in that: and the piston (10) is also provided with a stain-resistant ring (6) and a guide ring (7).