CN208686965U

CN208686965U - Piston rod seal component

Info

Publication number: CN208686965U
Application number: CN201820666170.7U
Authority: CN
Inventors: 王艳华
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-07
Filing date: 2018-05-07
Publication date: 2019-04-02
Anticipated expiration: 2028-05-07

Abstract

The utility model discloses a kind of piston rod seal components, the sealing element includes shell and embedded component, and the section of the shell is in Y type, and the embedded component is in the groove of the shell, the embedded component is provided with double arc grooves, and the both ends of embedded component are contour with the both ends of the shell respectively.The utility model is by being designed as bi-material layers for sealing element, and the bottom portion of groove of sealing element is designed as double arcs, interior outer lip is designed as non-contour, improve the resilience, wearability and anti-extrusion performance of sealing element, and the response for changing the contact stress of lip with hydraulic system pressure is more timely, the contact stress distribution of static lip and dynamic lip is more reasonable, and low pressure leakage occurs so as to avoid hydraulic system, the abrasion for slowing down sealing element extends the service life of sealing element.

Description

Piston rod seal component

Technical field

The utility model relates to hydraulic cylinder fields, more particularly to the sealing of hydraulic cylinder piston rod, more specifically, It is to be related to a kind of packing type piston rod seal component.

Background technique

The primary seal of hydraulic cylinder piston rod is usually using Y type polyurethane (shore hardness ShA93~95) sealing element.It is this The contact stress of sealing element and groove and piston rod is the pressure increase with hydraulic system and increased, and system pressure is higher, The sealing performance of sealing element is better.But in system low-voltage movement or static low pressure, since seal lip fastening force is inadequate, It is easy to appear leakage.

Hydraulic system is leaked in low pressure in order to prevent, improves Y type piston rod frequently with following two mode at present The structure (shown in Figure 1) of sealing element:

First method is that O-ring 2 (rubber that material is generally ShA80~90) is filled in the groove 3 of sealing element, with Guarantee low pressure fastening force, shown in (A) figure as shown in figure 1.The major defect of this method is: 1) because wanting mounting O-shaped rings 2, institute Want contour with static lip and dynamic lip.Sealing element and piston rod are in relative motion state, are in relative static conditions with cylinder body, Therefore, the side sealing lip of sealing element and plunger rod contacts is known as dynamic lip, the side sealing lip contacted with cylinder body is referred to as quiet State lip.The dynamic lip of general piston rod is that outline is lower than static lip, in order to which hydraulic system pressure is led by dynamic lip Enter, keeps the contact stress of lip more timely to the pressure P response of system.2) it for the ease of mounting O-shaped rings 2, needs at 3 bottom of groove Portion's (i.e. at root position of O-ring 2) designs avoiding hollow groove 4, in this way, just will appear O-ring 2 from groove if there is pressure is trapped into The case where being squeezed out in 3.3) sealing element needs are assembled by ontology 1 and 2 two pieces product of O-ring, increase the complicated journey of operation Degree, while reducing the firmness of sealing element entirety.

Second method is to reduce the depth of the groove 3 of Y type sealing element, to improve fastening force, (B) figure institute as shown in figure 1 Show.The major defect of this method is: since the material hardness of seal body 1 is high, fastening force and rubbing between piston rod It is big to wipe power, therefore sealing part abrasion is fast, causes the service life of sealing element shorter.

Utility model content

The technical problem to be solved by the present invention is to provide a kind of piston rod seal components, it can prevent hydraulic cylinder from existing It is leaked when low pressure, and there is longer service life.

In order to solve the above technical problems, the piston rod seal component of the utility model, including shell and embedded component, the shell Section be in Y type, the embedded component is in the groove of the shell, section approximation V-type, and both ends are respectively with the both ends of shell etc. It is high.The embedded component is provided with a pair of arc groove.

The sealing element is packing type sealing element, and the depth of the double arc grooves of the sealing element will be shallower than conventional Y type sealing Part.

The both ends of the Y type shell are not contour.Preferably, the static lip of sealing element is designed as slightly above dynamic lip Mouthful, difference in height is preferably 0.5~1mm.

The radius R value of each arcuate bottom of double arc grooves ranges preferably from 0.3~2mm.Preferably, being reasonable distribution The contact stress of static lip and dynamic lip is greater than the arc close to dynamic lip side close to the radius of the arcuate bottom of static lip side The radius at bottom, the radial difference of two arcuate bottoms are preferably 0.3~1mm.

Preferably, the sealing element is an integral structure.The material of the shell be preferably shore hardness ShA93~ The polyurethane of ShA95；The material of the embedded component is preferably the polyurethane of shore hardness ShA88~ShA90.Two kinds of materials are primary Injection molding.

Compared with existing packing type piston rod seal component, the packing type piston rod seal component of the utility model, have with Lower advantages and beneficial effects:

1. the groove of sealing element is shallower, the fastening force of seal lip is high, in hydraulic system low pressure, can hold tightly well Piston rod avoids that low pressure leakage occurs.

2. the distribution of the contact stress of static lip and dynamic lip is more reasonable, the frictional force between dynamic lip and piston rod reduces, Sealing element is not allowed easy to wear, and the service life is longer.

The sealing element of the utility model, the bottom portion of groove of embedded component are double arcs, and the arc close to static lip side The radius R at shape bottom₁Slightly larger than the radius R of the arcuate bottom close to dynamic lip side₂, since static lip is relatively quiet with inboard wall of cylinder block Only, R₁Value is big, and for the contact stress that static lip is subject to regard to big, the frictional force of static lip and inboard wall of cylinder block is also big, and support performance is just It is good, it is just more stable after sealing element assembly up；And dynamic lip and piston rod are relative motions, R₂Be worth it is small, what dynamic lip was subject to For contact stress with regard to small, the frictional force between dynamic lip and piston rod is also small, and the service life of sealing element can extend.

3. using the different bi-material layers manufacture of hardness, embedded component uses the lower high-rebound polyurethane of hardness, can be improved The resilience of sealing element makes sealing element that can also hold piston rod tightly well in low pressure, avoids hydraulic system generation in low pressure Leakage；Shell uses high hardness polyurethane, it is ensured that the wear-resisting property of sealing element and anti-extrusion performance slow down the mill of sealing element Damage, extends the service life of sealing element.

4. static lip and dynamic lip use non-contour design, dynamic lip is slightly below static lip, hydraulic system pressure by Dynamic lip imports, and the response for changing the contact stress of lip with hydraulic system pressure is more timely.

5. embedded component and shell are integrally formed, the complexity of assembly is reduced, the fastness of sealing element entirety is improved.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of existing two kinds of packings type piston rod seal component.

Fig. 2 is the entirety and cross section structure schematic diagram of the packing type piston rod seal component of the utility model embodiment.

Fig. 3 is the section concrete structure schematic diagram of the packing type piston rod seal component of the utility model embodiment.

Fig. 4 is the production process schematic diagram of the packing type piston rod seal component of the utility model embodiment.

Fig. 5 is that use state of the packing type piston rod seal component of the utility model embodiment in hydraulic cylinder system is shown It is intended to.

The reference numerals are as follows in figure:

1: ontology

2:O type circle

3: groove

4: avoiding hollow groove

5: shell

6: embedded component

7: dynamic lip

8: static lip

9: double arc grooves

10: cylinder body of hydraulic oil cylinder

11: piston rod

R₁、R₂: the radius of arcuate bottom

P: hydraulic system pressure

Specific embodiment

There is more specific understanding for technology contents, feature and effect to the utility model, it is now in conjunction with attached drawing and specifically real Example is applied, the technical solution of the utility model is further described in detail.

The packing type piston rod seal component of the present embodiment, by the different polyurethane material of two kinds of hardness by being once molded into Type obtains, generally circular ring shape, as shown in Fig. 2, cross sectional shape approximation Y type.The structure of the piston rod seal component mainly includes outer 6 two parts of shell 5 and embedded component, as shown in Figure 3.Wherein:

The material of shell 5 is the high hardness polyurethane of shore hardness ShA95.The section of the shell 5 is in Y type, Y type opening two End is not contour, and outside is slightly above inside, and (side with plunger rod contacts is inside, the side contacted with cylinder body of hydraulic oil cylinder inner wall For outside), medial and lateral difference in height is 0.5~1mm.The V-type groove bottom of shell 5 is smooth arc.It does the bottom of shell 5 Camber chamfering.

The material of embedded component 6 is the high-rebound polyurethane of shore hardness ShA90.The embedded component 6 is recessed embedded in the shell 5 In slot, section approximation V-type, bottom is matched with the V-type groove bottom of shell 5, and both ends are contour with the both ends of shell 5 respectively, in Between have a pair of arc groove 9, as shown in Figure 3.The radius of two arcs of depth and bottom of double arc grooves 9 can basis The size of product is adjusted.In the present embodiment, the radius R value range of two arcuate bottoms is 0.3~2mm, wherein lateral arcs The radius R at shape bottom₁It is worth the radius R than inside arcuate bottom₂It is worth big 0.3~1mm, as shown in Figure 3.

The production of the sealing element can be by rotating bichromal injector single injection-molded, as shown in Figure 4.Specific producer Method is as follows:

First station barrel melts the high-rebound polyurethane of ShA90 in advance, and melting temperature is 180~230 DEG C.Second station barrel Melt the anti-extrusion polyurethane of high abrasion of ShA95 in advance, melting temperature is 180~250 DEG C.

Firstly, the ShA90 high rebound in the first station of double color mould, under 15~25Mpa injection pressure, after injection melting Polyurethane 3~5 seconds, pressure maintaining was 15~20 seconds cooling, the embedded component 6 of formation of sealing component.

Then, rotation is to second station, and under 20~30Mpa injection pressure, the ShA95 high abrasion after injection melting is anti-crowded Polyurethane 4~6 seconds out, pressure maintaining is 20~30 seconds cooling, the shell 5 of formation of sealing component.

Sealing element product is taken out in finally die sinking ejection.

In use, using the piston rod seal component as primary seal, it is assembled to hydraulic cylinder piston cylinder and piston rod cooperation Gap location, dynamic lip and plunger rod contacts, static lip are contacted with inboard wall of cylinder block, as shown in Figure 5.Due to the dynamic lip of the sealing element Mouthful lower than static lip, therefore when system is in low pressure, the contact stress of lip can in time with the variation of system pressure and Variation, simultaneously because the depth of groove of sealing element is shallower, and the resilience of embedded component is good, therefore the fastening force of sealing element is big, energy It effectively prevent system that low pressure leakage occurs；On the other hand, the design of double arc grooves makes the contact stress of static lip and dynamic lip It is more reasonable to distribute, and the frictional force of dynamic lip and piston rod reduces, and sealing part abrasion slows down, and service life extends.

Claims

1. piston rod seal component, which is characterized in that including shell and embedded component, the section of the shell is in Y type, the embedded component In the groove of the shell, which is provided with double arc grooves, the both ends of embedded component respectively with the shell two It holds contour.

2. sealing element according to claim 1, which is characterized in that the sealing element is packing type sealing element.

3. sealing element according to claim 1, which is characterized in that the static lip of the sealing element is higher than dynamic lip.

4. sealing element according to claim 3, which is characterized in that the difference in height of the static state lip and the dynamic lip For 0.5~1mm.

5. sealing element according to claim 1, which is characterized in that double arc grooves, the radius of each arcuate bottom are 0.3~2mm.

6. sealing element according to claim 1 or 5, which is characterized in that double arc grooves, close to static lip side The radius of arcuate bottom is greater than the radius of the arcuate bottom close to dynamic lip side.

7. sealing element according to claim 6, which is characterized in that the semidiameter of two arcuate bottoms is 0.3~1mm.

8. sealing element according to claim 1, which is characterized in that the material of the shell be shore hardness ShA93~ The polyurethane of ShA95；The material of the embedded component is the polyurethane of shore hardness ShA88~ShA90.

9. sealing element according to claim 1, which is characterized in that the sealing element is an integral structure.