CN215370737U

CN215370737U - Hydro-pneumatic spring sealing structure

Info

Publication number: CN215370737U
Application number: CN202121838799.3U
Authority: CN
Inventors: 杨明; 杨敦朋; 杨小琛
Original assignee: Yantai Newstar Aero Hydraulics Co ltd
Current assignee: Yantai Newstar Aero Hydraulics Co ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2021-12-31
Anticipated expiration: 2031-08-09

Abstract

The utility model belongs to the technical field of hydro-pneumatic springs, and particularly relates to a hydro-pneumatic spring sealing structure which comprises a guide sleeve, wherein a cylinder barrel is sleeved on the guide sleeve, a piston is arranged in the cylinder barrel in a sliding manner, a piston rod is arranged in the guide sleeve, a floating piston is arranged in the piston rod, the hydro-pneumatic spring sealing structure also comprises a guide sleeve assembly, a piston assembly and a floating assembly, the guide sleeve assembly comprises a framework dust ring, a rod dynamic seal, a buffer ring and a self-lubricating bearing which are respectively arranged on the piston rod, the floating assembly comprises a hole ring, a combined ring and a hole supporting ring I which are arranged on the floating piston, and the piston assembly comprises three hole supporting rings II which are arranged on the piston rod; the sealing structure can ensure that the hydro-pneumatic spring product is free of maintenance within two years, reduces the maintenance cost, effectively prevents impurities from entering the hydro-pneumatic spring to cause sealing failure and the loss of the function of the whole hydro-pneumatic spring, has good sealing effect on gas, and can prevent the gas from leaking into an oil cavity.

Description

Hydro-pneumatic spring sealing structure

Technical Field

The utility model relates to the technical field of hydro-pneumatic springs, in particular to a hydro-pneumatic spring sealing structure.

Background

The existing guide sleeve assembly adopts two Stent seals and two supporting rings, and the Stent seals allow certain leakage and cannot well control the leakage; the two supporting rings increase the requirement of processing on coaxiality, and easily cause the risk of supporting a shoulder rod due to non-coaxiality, thereby reducing the supporting effect and causing eccentric wear of the sealing ring. The friction resistance is increased by the ring for the piston mounting hole, so that the reaction sensitivity of the hydro-pneumatic spring is reduced, the requirement on the cylinder barrel is strict, the processing cost is increased, and the service life of the sealing ring can be reduced by long-time high-speed and high-frequency friction; the supporting rings at the two ends of the floating piston are short in length and weak in supporting capacity, unbalance loading can be generated after long-time use, and the piston rod is easily scratched, so that sealing failure is caused; the sealing ring can be abraded, high-pressure gas in the gas cavity can flow into the oil cavity, oil liquid emulsification and pressure reduction of the nitrogen cavity are caused, elasticity is insufficient, the buffering effect is lost, a customer needs to test the pressure in the spring irregularly and replace hydraulic oil in the oil cavity, and maintenance cost is increased for the customer.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a hydro-pneumatic spring sealing structure, which overcomes the defects of the prior art and aims to solve the problems in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: hydro-pneumatic spring seal structure, including the uide bushing, the uide bushing is overlapped and is equipped with the cylinder, slidable mounting has the piston in the cylinder, be equipped with the piston rod in the uide bushing, be provided with floating piston in the piston rod, still include uide bushing subassembly, piston assembly and unsteady subassembly, the uide bushing subassembly is including installing skeleton dust ring, pole dynamic seal, buffer ring and the self-lubricating bearing on the piston rod respectively, unsteady subassembly is including setting up circle, combination circle and the hole supporting ring one for the hole on floating piston, the piston assembly is including locating three hole supporting rings two for the hole on the piston rod.

As a preferable technical scheme of the utility model, the guide sleeve and the piston are made of nodular cast iron.

The utility model has the beneficial effects that:

the guide sleeve assembly seal of the utility model adopts the self-lubricating bearing of the imported material to provide support for the sealing system, and adopts the main seal structure and the auxiliary seal structure, so that the seal system can play a good role in sealing under different pressures of high pressure and low pressure, and the framework dust ring can scrape the sludge on the piston rod, thereby preventing impurities from entering the hydro-pneumatic spring to cause seal failure and the loss of the function of the whole hydro-pneumatic spring.

The high-strength supporting rings at the two ends can play a good role in guiding, protect the middle sealing ring and prolong the service life of the sealing ring; two one-way sealing rings are installed back to back, play the effect of two-way sealing, and unique combination circle structure has fine sealed effect to gas, can prevent that gas from leaking the fluid chamber, and the fluid that leads to is rotten, the not enough scheduling problem of atmospheric pressure.

The sealing structure can ensure that the hydro-pneumatic spring product is free of maintenance within two years, reduces the maintenance cost, effectively prevents impurities from entering the hydro-pneumatic spring to cause sealing failure and the loss of the function of the whole hydro-pneumatic spring, has good sealing effect on gas, and can prevent the gas from leaking into an oil cavity.

Drawings

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

In the figure: 1. a guide sleeve; 2. a cylinder barrel; 3. a floating piston; 4. a piston rod; 5. a piston; 6. a framework dustproof ring; 7. the rod is sealed in a moving way; 8. a buffer ring; 9. a self-lubricating bearing; 10. a ring for hole; 11. combining rings; 12. a first supporting ring; 13. and a second supporting ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiment is only an assembly embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1, the hydro-pneumatic spring sealing structure comprises a guide sleeve 1, wherein a cylinder barrel 2 is sleeved on the guide sleeve 1, a piston 5 is arranged in the cylinder barrel 2 in a sliding manner, a piston rod 4 is arranged in the guide sleeve 1, a floating piston 3 is arranged in the piston rod 4, the hydro-pneumatic spring sealing structure also comprises a guide sleeve assembly, a piston assembly and a floating assembly, the guide sleeve assembly comprises a framework dust ring 6, a rod dynamic seal 7, a buffer ring 8 and a self-lubricating bearing 9 which are respectively arranged on the piston rod 4, the framework dust ring 6 adopts the framework dust ring, sludge on the piston rod can be completely scraped, and the metal assembly is subjected to rust-proof treatment, so that sealing failure caused by corrosion can be avoided; the rod dynamic seal 7 is a main sealing element, so that the friction is low, and the sealing performance is good; the piece 8 can buffer the instant overlarge pressure of the hydro-pneumatic spring, protect the rod dynamic seal 7 and prolong the service life of the rod dynamic seal 7; the self-lubricating bearing 9 is made of imported materials, has low friction coefficient and good self-lubricating performance, plays a role in supporting and protecting the whole sealing system and plays a vital role in playing the function of the whole sealing system; meanwhile, the piston rod 4 is guided to extend and retract, so that the unbalance loading when the piston rod 4 is completely extended is in a reasonable range, the normal operation of the whole sealing system is ensured, and the external leakage cannot be generated after long-term use.

The floating assembly comprises a hole ring 10, a combined ring 11 and a hole supporting ring I12 which are arranged on the floating piston 3, the supporting ring I12 is arranged at two ends of the floating piston, and the sealing ring is protected from being damaged due to unbalance loading by adopting a supporting material with low friction, good guiding performance and high compressive strength; the combined ring 11 adopts a combined sealing ring, and has an obvious effect on sealing gas; the hole ring 10 is two one-way hole sealing rings, a back-to-back installation mode is adopted, the oil cavity side hole ring 10 can seal hydraulic oil and prevent the hydraulic oil from leaking to an air cavity, the air cavity side hole ring 10 can protect the combined ring 11 and prevent high-pressure air from damaging the combined ring 11, and the hole ring 10 and the combined ring 11 are combined in a sealing mode to achieve double-layer safety, so that the sealing system is ensured not to fail for a long time; special high-temperature-resistant lubricating grease is smeared on the lubricating oil channel, so that the lubricating and cooling effects on a sealing system can be achieved when the floating piston moves at high speed and high frequency, and the problems that local temperature is too high and a sealing ring is burnt due to dry friction and the like of the sealing ring are solved.

The three second support rings 13 form a labyrinth passage, so that the oil passing amount of the two oil cavities can be well controlled, the oil passing amount of the two oil cavities is in a set range, and the oil passing amount of the two oil cavities is matched with the other two sets of sealing systems to stably exert the functions of the hydro-pneumatic spring.

Example two

The difference between the comparative example and the first embodiment is that the guide sleeve 1 and the piston 5 are made of nodular cast iron and can be used as an auxiliary bearing, the hydro-pneumatic spring cannot be immediately failed even if the main bearing fails, the hydro-pneumatic spring only can be weakened, and sufficient preparation time is provided for maintenance personnel.

Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element 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.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model as defined in the following claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Hydro-pneumatic spring seal structure, including uide bushing (1), its characterized in that, the cover is equipped with cylinder (2) on uide bushing (1), slidable mounting has piston (5) in cylinder (2), be equipped with piston rod (4) in uide bushing (1), be provided with floating piston (3) in piston rod (4), still include uide bushing subassembly, piston assembly and floating assembly, the uide bushing subassembly is including installing skeleton dust ring (6), pole dynamic seal (7), cushion ring (8) and self-lubricating bearing (9) on piston rod (4) respectively, floating assembly is including setting up circle for the hole (10), combination circle (11) and the hole support ring (12) on floating piston (3), piston assembly is including locating three hole support ring two (13) on piston rod (4).

2. The hydro-pneumatic spring seal structure of claim 1, wherein the guide sleeve (1) and the piston (5) are both of ductile iron.