CN109237033A - sealing ring - Google Patents

Abstract

The present invention relates to a kind of sealing rings, it has at least one sealing lip (1), there is the sealing lip at least one to feed back spire (2), which is characterized in that feed back the spire depth (3) that spire (2) have≤30 μm.

Description

Sealing ring

Technical field

The present invention relates to a kind of sealing rings, have at least one sealing lip, the sealing lip is at least one feedback Spire.

Background technique

Such sealing ring as known to 1 249 648 A2 of EP and be sealing device arragement construction component part.

Sealing ring is configured to radial shaft seals circle, has the support ring made of hard tough material, and sealing lip is fixed on In the support ring.The axial direction towards the space to be sealed of sealing lip ride out forward and under radial prestressing force hermetically Surround the axis to be sealed.On its side towards the axis to be sealed, sealing lip has the surface forming for feeding back spire form Portion, with the medium for that will be sealed during the defined use of sealing ring into the feedback space to be sealed.

Furthermore generally known includes the other sealing rings for feeding back spire in sealing lip.

Formerly the spire depth of the feedback spire in the sealing lip of known sealing ring is usually 0.1mm to 0.3mm, Because being responsible for opinion of the those skilled in the art of the structure of sealing ring by threading theoretical so far is spiral as deep as possible Portion causes the best use characteristic of sealing ring, best feedback of the medium especially to be sealed into the space to be sealed. Measure under the foregoing description and common spire depth profile is, by liquid stabilising as much as possible in the long time It is back transported on interval in the space to be sealed.

Because all sealing devices are wear-out parts, be included in when to spire depth scale cun really sealing lip and And the abrasion of spire determined by operation is therefore fed back, to realize enough spire depth also with service life progress Thus enough conveying effects.In sealing ring by manufacturing in the state determined, spire depth is preferably at most.

However explanation has the spire depth between 0.1mm and 0.3mm with big spire depth, for example as before Thick spire structure have the shortcomings that obviously aggravate.Such thick spire structure causes from the environment of sealing ring to close Very high air delivery in the space of seal apparatus arragement construction to be sealed.Due to the very high air delivery, only lead to The sealing ring including feeding back spire is crossed, the opposite over-voltage until 1 bar can be formed in the space to be sealed.In order to inhibit The unfavorable effect, it usually needs axis exhaust, engine exhaust or speed changer exhaust, because sealing lip is otherwise in the shortest time Interior strong wear.

However consuming and valuableness on such exhaust structure.

Furthermore dangerous, due to big spire depth, especially in the machine element to be sealed relative to sealing lip When out of service, that is, for example in the cooling stage of sealing ring, parrot coal is formed in the screw pitch for feeding back spire.Parrot coal for Sealing function adversely works.

Especially in conjunction with the very high air delivery of the foregoing description entered with high oxygen, occur feeding back spire In disadvantageously form parrot coal.

If with thick spire structure sealing device the machine element to be sealed high peripheral speed and/or It is formed in the case of high oil sump temperature in use, then also further strengthening undesirable parrot coal.

Summary of the invention

The task of the present invention is be further improved sealing ring of the type mentioned at the beginning, so that it uses the longevity in long in this way It is especially enough good into the space to be sealed despite the presence of the medium to be sealed with good using characteristic during life Feedback effect, parrot coal in the feedbacks spire of sealing lip forms and is reduced to minimum value.

The task is solved according to the present invention by the sealing ring of the feature with claim 1.Dependent claims are related to Advantageous design.

In order to solve task setting sealing ring, spire is fed back in the sealing ring, and the spire with≤30 μm is deep Degree.

It is preferred that spire depth is 10 μm to 20 μm.

Make us it has surprisingly been found that, rather than as assumed so far, that is, the spire depth for feeding back spire is deeper, Then the use characteristic of sealing ring is better.

≤ 30 μm, preferably 10 μm to 20 μm of spire depth it is enough that the medium to be sealed under sealing lip is reliable Ground is fed back in the space of sealing device arragement construction to be sealed.

However in the design according to the invention of spire depth for feeding back spire particularly advantageously, it is also sealing It will not actually find that parrot coal is formed in after the service life of the length of circle to feed back in spire.Even if when the machine to be sealed member When part is run with high revolving speed relative to sealing lip and/or sealing device arragement construction has high oil sump temperature, still will not.

This may be attributed to, and only convey small volume flow by small spire depth, thus come from sealing lip and want The heat dissipation of contact zone between the machine element of sealing especially effectively and is therefore feeding back inclining for the parrot coal formation in spire To being reduced to minimum value.

Also after thousands of working hours of sealing ring, by feeding back the very delicate construction of spire and described only non- Often small spire depth discovery parrot coal will not be formed in feeding back spire.

It is also advantageous that the sealing lip of original dynamic application of load is deep by the only very small spire for feeding back spire Degree also causes good static sealing in machine element that is static, being sealed.By the small spiral shell for feeding back spire Rotation portion depth, the static machine element to be sealed and sealing lip be radially orientated machine element be provided with feedback on it Between the side of spire generate capillary activity narrow part seal clearance, in the seal clearance, also it is static, want In the machine element of sealing, the medium to be sealed reliably is prevented to be discharged in environment.

Therefore such as ring is not needed in the machine element static relative to sealing lip in sealing ring according to the invention Around, closed seal convexity portion itself or circular, closed sealing lip itself, inhibit to exist with the medium for that will seal In the space to be sealed.

Furthermore the small spire depth for feeding back spire is fatefully responsible for this, that is, sealing ring is also in following situation Two direction of rotation of the machine element to be sealed can be used, that is, spire is fed back using only one in sealing lip, The spire that feeds back has the main conveying effect towards the direction in the space to be sealed.

In the prior art sealing ring used so far for including deep spire structure, in the machine element to be sealed As previously described like that since deep spire structure often has greatly unacceptable leakage when direction of rotation converts.Based on non- Often tiny spire structure, conveying act on it is also minimum when direction of rotation converts in the sealing ring for bearing load, thus directly Appearance is not leaked to several hours.

Can also by the feedback spire with small spire depth there is no problem ground compensation pressure load.

Spire structure is deeper, then pressure difference more crucially acts on sealing lip.Stop fortune in the machine element to be sealed It is also possible to such case when row.Based on the very small spiral shell being also further reduced under the overpressure situation being applied on sealing lip Rotation portion depth and the surface tension at this moment also acted on strongly will not leak in low viscosity, the medium to be sealed.

The sealing lip can be made of the material of elastomer.For most service condition, can usually obtain at low cost Such sealing material with various specifications.

It can be set to according to another kind design, sealing lip is by polymer material, preferably PTFE (polytetrafluoroethylene (PTFE)) material It is made.Especially the sealing lip made of such material has good always using special during very long service life Property.

Feedback spire with only very small spire depth≤30 μm is preferably drawn with determining by manufacture by coining Enter in sealing lip.Such manufacturing process can process be reliably carried out.

Detailed description of the invention

Then the embodiment of sealing ring according to the invention is explained further by the Fig. 1 schematically shown.

Specific embodiment

Sealing ring is the component part of sealing device arragement construction, and the sealing device arragement construction is other than sealing ring The machine element 4 to be sealed and shell 5 of form with the axis to be sealed, the shell will be sealed with radial distance encirclement Machine element.Sealing ring is set in the gap formed by radial distance.

The axial direction towards the space 6 to be sealed of the sealing lip 1 of sealing ring rides out forward and under radial prestressing force Seal around the machine element 4 to be sealed.It is described on the side for being radially orientated the machine element 4 to be sealed of sealing lip 1 Sealing lip, which is equipped with, feeds back spire 2, and the feedback spire has spire depth 3, and the spire depth is in the reality shown Apply is 10 μm to 20 μm in example.

Sealing lip 1 by being suitable for the sealing material of corresponding service condition, in embodiment shown here by elastomer Material be made.

Based on only very small spire depth 3, only very small volume flow is by feeding back spire 2 towards being sealed The direction in space 6 conveys, wherein due to small volume flow, also only less air is introduced into the space 6 to be sealed from environment And it therefore is practically without to form over-voltage there.

Sealing ring according to the invention uses characteristic with good always during very long service life, then practical Upper no parrot coal is formed in feeding back spire 2.

Claims (5)

1. sealing ring, the sealing ring has at least one sealing lip (1), and there is the sealing lip at least one to feed back spire (2), which is characterized in that feed back the spire depth (3) that spire (2) have≤30 μm.

2. sealing ring described in accordance with the claim 1, which is characterized in that spire depth (3) is 10 μm to 20 μm.

3. sealing ring according to claim 1 or 2, which is characterized in that sealing lip (1) is made of the material of elastomer.

4. sealing ring according to claim 1 or 2, which is characterized in that sealing lip (1) is made of polymer material.

5. sealing ring according to claim 4, which is characterized in that sealing lip (1) is made of PTFE.