Patent No.:CN2746201 Date:2004.11.11

Google Patent: https://patents.google.com/patent/CN2746201Y/en?oq=CN2746201

China Patent: http://epub.cnipa.gov.cn/

Abstract

The utility model discloses a controllable adjustable two-way rigidity locking gas spring, overcoming the defect that the existing spring only can be one-way rigidity locked in prior art. The utility model consists of a cylindrical shell, a cylinder rod and a piston. The piston is provided with an orifice and a center through-hole and a valve needle is provided inside the center through-hole. One end of the valve needle is connected with a regulating stem. The other end of the cylindrical shell is sealed by a rear block and a floating piston is provided between the piston and the rear block. Thus, the cylindrical shell is divided into an air chamber and a hydraulic-oil chamber. A float trap is provided between the piston and the floating piston. The utility model can adopt the method of the existing product and adjust the latched position at can by the regulating stem. The function of two-way rigidity locking can be achieved after loosening hands. The effect of hydraulic damping is likewise provided and the resistance to shock is good. The utility model has the advantages of simple structure, original conception, good sealing property, etc. The utility model can be extensively used in the fields of medical bed for turning body, aviation, vehicle seat for adjusting back support, etc.

Description

Controllable two-way rigid locking air spring
Technical field
The air spring manufacturing technology field that the utility model relates to and a kind ofly is used for that medical bed is leaned to one side, aviation and vehicle seat back are regulated especially refers to the two-way rigid locking device of air spring.
Background technique
The invention of air spring technology and the history of using existing decades thereof, that sells on the market is of a great variety, and it mainly utilizes the pressurized gas in the sealed cylinder block, through going to promote the motion of piston rod after the damping of hydraulic piston.For example 93110703.2 applications for a patent for invention that are called ” hydraulically controlled pneumatic elastic jackstay ” of disclosed application number on February 16th, 1994, ” piston rod second half section cavity pneumatic or the hydraulic control elastic jackstay is slightly larger than preceding half section cavity; be provided with poppet shaft in its second half section cavity; form main damping oil pocket between the front-end face of poppet shaft ear end face and cylinder body rear portion inner carrier; piston rod between the inwall of the outer wall of one section body between big end of its afterbody and the stuffing box gland and cylinder body relevant position, form auxilliary damping oil pocket, assist the damping oil pocket and when poppet shaft is opened, be connected by the damping hole on the big end of piston rod afterbody.” this product has that strut elasticity is strong, speed is easy to control and advantage such as arbitrary position locking.But anatomize this patent application prospectus, in conjunction with practical application experience, the claimant has found that this product has the defective that can not reach two-way rigid locking, and promptly when being subjected to pressure stress, this series products can only reach elastic locking, but not rigid locking.This elastic locking scope and air chamber air pressure are inversely proportional to.Therefore, this series products be applied to medical bed lean to one side to support the time, must have rocking to a certain degree, it is required to satisfy clinical treatment.Manufacturer is in order to dwindle its elastic locking distance, has to improve air chamber air pressure offsetting external force so that product when making the requirement for gas sealing ability improve again and again, cost of production increases greatly.
The model utility content
The technical problems to be solved in the utility model is the air spring product that a kind of novelty is provided to society, this product is arbitrarily adjusted locked position by adjustable lever, can reach two-way rigid locking function after loosing one’s grip, to overcome deficiency that only possesses unidirectional rigid locking function and the defective that prior art exists, satisfied more technical fields are required for the installation of hydraulically controlled pneumatic elastic parts.
The technological scheme that its technical problem that solves the utility model adopts is: controllable two-way rigid locking air spring comprises that a cylindrical shell and an end insert into the inner the piston rod in chamber, and the piston rod end of stretching into the circular cylindrical shell intracoelomic cavity is connected with piston; Piston is established damping hole and central through bore, is provided with needle in the central through bore, and needle one end is connected with adjustable lever; The other end of cylindrical shell is established floating piston by back stifled the sealing between piston and back blocking up, the circular cylindrical shell intracoelomic cavity is divided into air chamber and fluid chamber, establishes floating valve between described piston and floating piston.
Described floating valve is embedded in the inward flange of cylindrical shell, fixes along the axle directions X; Inward flange and floating valve circumferential surface middle part are provided with seal ring.
Described floating valve includes spool, Returnning spring and Sealing.
The controllable two-way rigid locking air spring product of the utility model is set up a floating valve between piston and floating piston, this floating valve is embedded in the inward flange of cylindrical shell, fixes along the axle directions X.This product is under lock state, and when piston rod was subjected to pressure stress, piston promoted hydraulic oil and flows, and makes the floating valve quick closedown, and air spring is realized the rigid locking function.Therefore, this product air chamber air pressure needn’t fill De Taigao, only needing normally to promote piston rod bounce-back answer gets final product, its rigid locking task in compressive state is finished by floating valve entirely, can reduce in the air chamber manufacture process requirement greatly for gas sealing ability, promptly can save production cost, can prevent gas leakage again.This product can be continued to use the existing product mode and arbitrarily adjust locked position by adjustable lever in use, but can reach two-way rigid locking state after loosing one’s grip.During bounce-back, have the hydraulic damping effect equally, shock-absorbing capacity is good.This product structure is simple, novel, anti-leak gas performance is good, can be widely used in that medical bed is leaned to one side, field such as aviation and vehicle seat back adjusting.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model locking stroke adjusting device structural representation.
Embodiment
As shown in Figure 1 and Figure 2, the controllable two-way rigid locking air spring of the utility model comprises that with axle X be the cylindrical shell 23 of a core and the piston rod 24 that an end inserts into the inner the chamber, and piston rod 24 ends of stretching into cylindrical shell 23 inner chambers are connected with piston 5.The other end of cylindrical shell 23 is given airtight by back stifled 14, the center of back stifled 14 is embedded with steel ball 13 so that charge into high pressure nitrogen.Cylindrical shell 23 inner chambers adjacent with back stifled 14 are air chamber 12, establish floating piston 15 between piston 5 and back block up 14, and cylindrical shell 23 inner chambers are divided into air chamber 12 and fluid chamber 8.Floating piston 15 circumferential surfaces are embedded with seal ring, realize and the partition of cylindrical shell 23 inwalls that piston 5 is isolated into fluid chamber 8 B chamber and C chamber again.Stretch out at piston rod 24 roots of cylindrical shell 23 outsides and establish cushion collar 1, to slow down external impact.For the smooth running that guarantees piston rod 24 and prevent the hydraulic oil seepage, cylindrical shell 23 inner chambers that are away from stifled 14 1 ends in back are established guide sleeve 2, seal ring 3 and spacer 22 successively.As shown in Figure 2, be provided with the locked position controlling device between B chamber and the C chamber, described locked position controlling device comprises the needle 19 of being located at piston 5 central through bores, is located at the damping hole 26 on piston 5 peripheral wall and is positioned at piston rod 24 center holes and peak at the adjustable lever 25 of needle 19.For guaranteeing the sealability of piston B chamber, 5 both sides and C chamber, needle 19 is with seal ring 20, septulum cover 6, seal ring 20 and jump ring 7 from left to right successively.For prevent hydraulic oil from the C chamber through piston rod 24 center hole seepages, establish pad 21 and seal ring 4 at the piston rod 24 and the joint of piston 5.With respect to existing product, the utility model product is set up floating valve 9 between piston 5 and floating piston 15, this floating valve 9 is embedded in the inward flange 10 of cylindrical shell 23, fix along the axle directions X, inward flange 10 is established a seal ring 11 with floating valve 9 circumferential surfaces middle part, prevents that hydraulic oil is from seepage between floating valve 9 circumferential surfaces and cylindrical shell 23 internal chamber walls.Floating valve 9 is provided with spool 18, Returnning spring 17 and is used for the Sealing 16 of plane sealing.
Continue to narrate in conjunction with the accompanying drawings working principle of the present utility model below.Before this product export, earlier inject hydraulic oil toward fluid chamber 8, stifled 14 charge into air chamber 12 with nitrogen from the back, with steel ball 13 shutoff sealing.
In conjunction with Fig. 1, shown in Figure 2, when the locked position of the utility model product is regulated, force in adjustable lever 25 and back down needle 19, the hydraulic circuit between B chamber and the C chamber thin bar 28 and septulum overlap 6 inwalls through needle 19 middle parts gap, septulum overlap 6 cinclides 27, piston 5 damping holes 26 and mutual conduction.Then, drive pistons 5 and move to right by promoting piston rod 24, behind the hydraulic oil pressurized of B chamber, oil pressure is acted on spool 18 and make it to move to right, 9 moments of floating valve close, and B chamber hydraulic oil can’t flow to the A chamber.Meanwhile, because B chamber hydraulic oil pressurized, beginning flow to the C chamber after gap, septulum that thin bar 28 in needle 19 middle parts and septulum overlap 6 inwalls overlap 6 cinclides 27, piston 5 damping holes 26.After reaching the required locked position of user, unclamp adjustable lever 25, the external pressure that B chamber hydraulic oil bears disappears, air chamber 12 promotes floating piston 15 and moves to left, and spool 18 is opened under spring 17 effects again, oil pressure is passed to the B chamber by the A chamber, and oil pressure pushes back to piston 5 central through bores with needle 19, and oil circuit cuts off and closes between B chamber and the C chamber.At this moment, when piston rod 24 was subjected to outside tensile stress, because C chamber hydraulic oil is in the state of sealing, piston rod 24 was in the rigid locking state.And when piston rod 24 was subjected to outside pressure stress, B chamber hydraulic oil pressurized, oil pressure acted on spool 18, spool 18 is moved to right, and 9 moments of floating valve close, and B chamber hydraulic oil can’t flow to the A chamber, B chamber hydraulic oil is in the state of sealing, and piston rod 24 is in the rigid locking state.
When the locked position of the utility model product is automatically reset, only force in adjustable lever 25 and back down needle 19, and piston rod 24 is not applied external force.As in the previous paragraph, hydraulic circuit between B chamber and the C chamber thin bar 28 and septulum overlap 6 inwalls through needle 19 middle parts gap, septulum overlap 6 cinclides 27, piston 5 damping holes 26 and mutual conduction, air chamber 12 promotes floating piston 15 and moves to left, hydraulic oil flows into the B chamber through floating valve 9 by the A chamber, B chamber oil pressure acts on piston 5 right flanks, and piston 5 and piston rod 24 are released cylindrical shell 23 inner chambers.The volume that air chamber 12 increases equals the volume that piston rod 24 stretches out the C chamber.Simultaneously the C chamber volume that causes reduces because piston 5 and piston rod 24 move to left, and C chamber hydraulic oil overlaps the gap that 6 cinclides 27, the thin bar 28 in needle 19 middle parts and septulum overlap 6 inwalls through piston 5 damping holes 26, septulum, is back to the B chamber.C chamber hydraulic oil produces liquid damping buffering effect to piston 5 left surfaces in flowing to B chamber process, thus realize piston rod 24 slowly and elasticity is stretched out, its speed of stretching out then depends on the diameter dimension of piston 5 damping holes 26.

Claims (3)

1, a kind of controllable two-way rigid locking air spring comprises that a cylindrical shell and an end insert into the inner the piston rod in chamber, and the piston rod end of stretching into the circular cylindrical shell intracoelomic cavity is connected with piston; Piston is established damping hole and central through bore, is provided with needle in the central through bore, and needle one end is connected with adjustable lever; The other end of cylindrical shell is established floating piston by back stifled the sealing between piston and back blocking up, the circular cylindrical shell intracoelomic cavity is divided into air chamber and fluid chamber, it is characterized in that establishing floating valve between described piston and the floating piston.

2, controllable two-way rigid locking air spring as claimed in claim 1 is characterized in that described floating valve is embedded in the inward flange of cylindrical shell, fixes along the axle directions X; Inward flange and floating valve circumferential surface middle part are provided with seal ring.

3, controllable two-way rigid locking air spring as claimed in claim 1 or 2 is characterized in that described floating valve includes spool, Returnning spring and Sealing.