CN217603352U - High-speed fluid dynamic pressure sealing structure for new energy vehicle - Google Patents

Abstract

The utility model discloses an automobile-used high-speed fluid dynamic pressure seal structure of new forms of energy, including the shell, be located the axle sleeve of shell, inlay the dress at the rotating ring of axle sleeve, with rotating ring assorted quiet ring subassembly, set up at a plurality of dynamic pressure grooves of rotating ring terminal surface, still include the bellows, bellows one end and quiet ring subassembly are kept away from one side fixed connection, the other end and the shell fixed connection of rotating ring place direction. The utility model provides an automobile-used high-speed fluid dynamic pressure seal structure of new energy to solve the above-mentioned problem among the prior art, realize providing a fluid dynamic pressure seal structure that is applicable to hypervelocity new energy automobile and uses, and then realize the purpose of new energy automobile motor long period steady operation.

Description

High-speed fluid dynamic pressure sealing structure for new energy vehicle

Technical Field

The utility model relates to a sealed field of dynamic pressure, concretely relates to automobile-used high-speed fluid dynamic pressure seal structure of new forms of energy.

Background

In the early development stage of new energy automobiles, an electric drive input shaft oil seal generally adopts a TC type standard oil seal, and along with the promotion of application requirements, the oil seal applied to the electric drive high-speed input shaft at present can be basically divided into two categories, namely a rubber framework oil seal and a Teflon (PTFE) oil seal. With the continuous development of new energy vehicles, the electric drive input shaft oil seal is also continuously improved and designed.

In the prior art, the allowable linear speed of an HTC type oil seal with a one-way oil return line is increased to about 38m/s, the limit of a TC type standard oil seal is broken through, but the anti-rotation capability of the HTC type oil seal is poor; although the HTC type oil seal can be designed into a bidirectional oil return line type, the oil return effect is far inferior to that of a unidirectional oil return line, and the allowable linear speed of the bidirectional oil return line HTC type oil seal is generally reduced to below 30 m/s; the allowable linear speed of the Teflon (PTFE) oil seal with the spiral groove can reach 50-60 m/s, but the oil seal can be disabled in a short time due to the poor reverse rotation resistance of the spiral groove due to the unidirectional pumping characteristic of the spiral groove.

Therefore, in the field of new energy automobiles, the prior art cannot meet the requirement of electric drive shaft end sealing for ultra-high speed application scenes of more than 40m/s and harsh bidirectional rotation working conditions.

SUMMERY OF THE UTILITY MODEL

The utility model provides an automobile-used high-speed fluid dynamic pressure seal structure of new energy to solve the above-mentioned problem among the prior art, realize providing a fluid dynamic pressure seal structure that is applicable to hypervelocity new energy automobile and uses, and then realize the purpose of new energy automobile motor long period steady operation.

The utility model discloses a following technical scheme realizes:

the high-speed fluid dynamic pressure sealing structure for the new energy vehicle comprises a shell, a shaft sleeve positioned in the shell, a moving ring embedded in the shaft sleeve, a static ring assembly matched with the moving ring, a plurality of dynamic pressure grooves formed in the end face of the moving ring, and a corrugated pipe, wherein one end of the corrugated pipe is fixedly connected with one side of the static ring assembly, which is far away from the moving ring, and the other end of the corrugated pipe is fixedly connected with the shell.

In order to solve the problems that in the prior art, in the field of new energy vehicles, an ultra-high speed electric drive input shaft oil seal has poor motor stability and short operation period under harsh motion working conditions, the utility model provides a high-speed fluid dynamic pressure sealing structure for new energy vehicles, the structure is provided with a corrugated pipe between a static ring component and a shell which are sealed by dynamic pressure, so that one end of the corrugated pipe is fixed on one side of the static ring component departing from a moving ring, and the other end of the corrugated pipe is fixed on the shell; in addition, this application can also compensate the secondary leakage problem that the sealing ring caused because of reasons such as wearing and tearing, axial float and vibration. When the device works, air enters from the low-pressure side of the end of the corrugated pipe, is pumped to the high-pressure side through the dynamic pressure groove of the sealing end face, and forms a layer of extremely thin air film at the end face to block a lubricating oil leakage channel at the high-pressure side, so that zero leakage of lubricating oil is realized; the sealing surface is closed in the shutdown state, so that the leakage of lubricating oil can be effectively prevented, and the sealing is tight. Consequently, this application has satisfied in the new energy automobile field, and the harsh operating mode of hypervelocity electric drive input shaft oil blanket can make its intensity and wearability improve when improving sealing reliability, is showing and has improved motor life and job stabilization nature. It should be noted that, the specific position of the corrugated pipe connected to the housing is not limited in this embodiment, and only the requirement that the corrugated pipe exerts its floatability and random compensation performance is satisfied.

Preferably, the dynamic pressure groove in the present application is any bidirectional rotating groove in the prior art, so that the requirement of motor reverse rotation can be met.

Furthermore, the static ring assembly comprises a first ring and a second ring embedded in the first ring, the second ring is opposite to the movable ring, and one end of the corrugated pipe is fixedly connected with the first ring. The static ring assembly in the scheme is composed of two parts, wherein a first ring is used for being connected with the corrugated pipe and providing a space for the fixed installation of the corrugated pipe; the second ring is used as a part which is matched with the dynamic seal of the dynamic ring in the static ring component and is opposite to the dynamic ring. Wherein the second ring is mounted within the first ring to ensure the integrity of the stationary ring assembly.

Further, the first ring is a metal ring, and the second ring is a graphite ring or a silicon carbide ring. Namely, the first ring is made of metal materials, so that the first ring is conveniently and fixedly connected with the corrugated pipe; the second ring adopts a graphite ring or a silicon carbide ring, which is beneficial to reducing abrasion and prolonging service life.

Further, the second ring is in interference fit with the first ring; the movable ring is in interference fit with the shaft sleeve; to sufficiently ensure connection stability.

Furthermore, the shell comprises a shell body and a gland fixedly connected to one end of the shell body; the bellows is fixedly connected between the first ring and the gland. The scheme limits the concrete position of the corrugated pipe connected to the shell, divides the shell into at least a shell and a gland, and fixedly connects one end of the corrugated pipe with the gland.

Further, an adjusting gasket is assembled between the gland and the shell to play a role in adjusting the gap.

Furthermore, the adjusting gasket is made of polytetrafluoroethylene materials, and can play a role in adjusting the gap and sealing.

Furthermore, the corrugated pipe is made of metal materials, so that the defect that the traditional dynamic auxiliary seal cannot resist high temperature is overcome.

Further, the opening of the dynamic pressure groove is positioned on the inner diameter side of the end surface of the dynamic ring. For the electric drive input shaft oil seal of a new energy automobile, the high-pressure side is arranged on the inner side of the sealing end face, so that the dynamic pressure groove is opened at the inner diameter edge of the end face of the movable ring, air is pumped to the high-pressure side during normal work, an extremely thin air film is formed on the end face to achieve non-contact operation, zero leakage of lubricating oil is achieved, and power consumption is extremely low.

Furthermore, the dynamic pressure groove is a T-shaped groove, and the requirement of motor reversal can be met.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to a high-speed fluid dynamic pressure seal structure for new forms of energy car has abandoned parts such as traditional dynamic auxiliary seal circle of pushing away ring type spring mechanical seal to avoided the particle impurity that dynamic auxiliary seal circle can cause to block, can not resist high temperature and can reduce the problem of sealed compensation ability because of its production axial frictional resistance.

2. The utility model relates to a high-speed fluid dynamic pressure seal structure for new forms of energy automobile can compensate the secondary leakage problem that the sealing ring caused because of reasons such as wearing and tearing, axial float and vibration.

3. The utility model relates to a high-speed fluid dynamic pressure seal structure for new energy automobile, air gets into from the low pressure side under operating condition, namely ripple pipe end, pumps to the high-pressure side through the dynamic pressure groove pump of sealed terminal surface to form a layer of extremely thin air film at the terminal surface, blocked the lubricating oil leakage passageway of high-pressure side, thereby realize the zero leakage of lubricating oil; the sealing surface is closed in the shutdown state, so that the leakage of lubricating oil can be effectively prevented, and the sealing is tight.

4. The utility model relates to an automobile-used high-speed fluid dynamic pressure seal structure of new energy has satisfied in the new energy automobile field, and the harsh operating mode of hypervelocity electric drive input shaft oil blanket improves the sealing reliability when can make its intensity and wearability obtain improving, is showing and has improved motor life and job stabilization nature.

5. The utility model relates to an automobile-used high-speed fluid dynamic pressure seal structure of new forms of energy adopts collection dress formula structure, and the installation is dismantled conveniently, is adapted to the rotational speed and is up to 100 ms, and there is the operating mode of reversal in temperature range-50 ~ 200 ℃ and high-speed shaft, and does not need extra auxiliary system, and the automobile-used high-speed rotation axis of specially adapted new forms of energy seals, can show improve equipment's long-term reliability and reduction energy consumption.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is a schematic view of a half-section structure of an embodiment of the present invention;

fig. 3 is a schematic structural view of a corrugated tube according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a rotating ring according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the first ring according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-shaft sleeve, 2-moving ring, 3-second ring, 4-shell, 5-first ring, 6-corrugated pipe, 7-adjusting gasket, 8-countersunk screw, 9-gland, 10-set screw and 11-dynamic pressure groove.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention. In the description of the present application, it is to be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present application.

Example 1:

a high-speed fluid dynamic pressure sealing structure for a new energy vehicle is shown in figures 1 to 4, wherein a movable ring 2 is embedded in a shaft sleeve 1 and fixed on a shaft along with the shaft sleeve 1, a dynamic pressure groove is formed in the end face of the movable ring, and an opening of the groove is formed in the edge of the inner diameter of a sealing ring, so that the movable ring runs in a non-contact mode during normal work, and power consumption is low; the static ring is formed by inlaying a first ring 5 and a second ring 3; one end of the corrugated pipe 6 is welded with the first ring 5, and the other end is welded with the gland 9; the gland 9 is fixedly connected to the shell 4; an adjusting gasket 7 is arranged between the gland 9 and the shell 4.

In this embodiment, the movable ring is fixed on the shaft and rotates along with the shaft, and the stationary ring assembly is fixed in the housing.

The first ring 5 in this embodiment is a metal ring, and the second ring 3 is a graphite ring or a silicon carbide ring; the bellows 6 is a metal bellows.

In this embodiment, the metal ring is shown in fig. 5, and a welding joint is left on the outer side of the metal ring, so that the metal ring can be conveniently welded with the corrugated pipe 6. The two ends of the corrugated pipe are welded by adopting an optimized inclination angle process so as to reduce the heat influence of welding spots to the maximum extent and eliminate stress.

In the present embodiment, the housing 4 and the gland 9 together form the unit housing.

Example 2:

a high-speed fluid dynamic pressure sealing structure for a new energy vehicle is characterized in that on the basis of embodiment 1, dynamic pressure grooves are T-shaped grooves, the number of the grooves is 8-24, the grooves are uniformly distributed along the sealing end face of a movable ring in an annular mode, and the depth of each groove is 5-20 microns.

In the embodiment, the end face of the movable ring is provided with the fluid dynamic pressure T-shaped groove, so that the requirement on motor reversal can be met, and the defect of poor reversal resistance of an oil seal of an electric drive input shaft of a new energy automobile in the prior art is overcome;

in one or more preferred embodiments, the movable ring 2 and the second ring 3 are made of silicon carbide.

In one or more preferred embodiments, the groove type of the dynamic pressure groove may be the remaining bidirectional rotating groove.

In one or more preferred embodiments, the movable ring 2 and the shaft sleeve 1 and the first ring 5 and the second ring 3 are embedded by a hot embedding process, so that the movable ring and the first ring are in a sufficient interference fit.

In one or more preferred embodiments, the gland 9 is fixedly connected to the shell through countersunk screws 8, and 6 to 12 countersunk screws 8 are uniformly distributed along the circumferential direction;

in one or more preferred embodiments, the sleeve 1 is provided with threaded holes in which several set screws 10 are provided for fastening the sleeve 1 to the shaft.

In one or more preferred embodiments, the material of the adjustment gasket 7 is polytetrafluoroethylene, and the gap can be adjusted and the sealing function can be performed.

In the embodiment, the high-pressure side is arranged on the inner side of the sealing end face, the groove opening is arranged on the edge of the inner diameter of the sealing ring, and the sealing ring operates in a non-contact manner during normal operation and has low power consumption; the static ring is formed by inlaying a silicon carbide ring and a metal ring, wherein the metal ring is welded with one end of the metal corrugated pipe; the other end of the metal corrugated pipe is welded with the gland, and the welded metal corrugated pipe has good floatability and random compensation performance and can be used as an elastic element and play a role in sealing, so that a dynamic auxiliary sealing ring of a common push ring spring type mechanical sealing seal does not need to be designed, the problems of particle impurity blockage, no high temperature resistance of the dynamic auxiliary sealing ring and reduction of sealing compensation capacity due to axial friction resistance generated by the dynamic auxiliary sealing ring are avoided, and the problem of secondary leakage of the sealing ring due to abrasion, axial movement, vibration and the like can be compensated. The gland passes through countersunk screw fixed connection on the unit casing, is equipped with the adjusting shim between gland and the casing, can play sealed effect when the adjustment clearance. Air enters from a low-pressure side, namely a metal corrugated pipe end, and is pumped to a high-pressure side through a dynamic pressure groove on a sealing end surface in a working state, and an extremely thin air film is formed on the end surface to block a lubricating oil leakage channel on the high-pressure side, so that zero leakage of lubricating oil is realized; the sealing surface is closed when the device is in a shutdown state, so that the sealing can be realized without leakage by preventing the leakage of lubricating oil.

The embodiment adopts a container type, is very convenient to install and disassemble, is suitable for the working conditions that the rotating speed is up to 100m/s, the temperature range is minus 50-200 ℃, and the high-speed shaft has reverse rotation, and does not need an additional auxiliary system; the high-speed rotating input shaft oil seal is particularly suitable for high-speed rotating input shaft oil seals for new energy vehicles, the long-term reliability of equipment can be obviously improved, and the energy consumption is obviously reduced.

The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, the term "connected" used herein may be directly connected or indirectly connected via other components without being particularly described.

Claims (10)

1. The utility model provides a high-speed fluid dynamic pressure seal structure for new energy automobile, includes the shell, is located axle sleeve (1) of shell, inlays rotating ring (2) of adorning in axle sleeve (1), with rotating ring (2) assorted quiet ring subassembly, set up a plurality of dynamic pressure grooves (11) at rotating ring (2) terminal surface, its characterized in that still includes bellows (6), bellows (6) one end and quiet ring subassembly keep away from one side fixed connection, the other end and shell fixed connection of rotating ring (2) place direction.

2. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 1, wherein the stationary ring assembly includes a first ring (5) and a second ring (3) embedded in the first ring (5), the second ring (3) and the moving ring (2) are opposite to each other, and one end of the bellows (6) is fixedly connected to the first ring (5).

3. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 2, wherein the first ring (5) is a metal ring, and the second ring (3) is a graphite ring or a silicon carbide ring.

4. The high-speed fluid dynamic pressure sealing structure for the new energy vehicle according to claim 2, wherein the second ring (3) is in interference fit with the first ring (5); the movable ring (2) is in interference fit with the shaft sleeve (1).

5. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 2, wherein the housing comprises a housing (4), a gland (9) fixedly connected to one end of the housing (4); the corrugated pipe (6) is fixedly connected between the first ring (5) and the gland (9).

6. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 5, wherein an adjusting gasket (7) is assembled between the gland (9) and the housing (4).

7. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 6, wherein the adjusting gasket (7) is made of a polytetrafluoroethylene material.

8. The dynamic pressure sealing structure for the high-speed fluid for the new energy vehicle as claimed in any one of claims 1 to 7, wherein the corrugated pipe (6) is made of a metal material.

9. The high-speed fluid dynamic pressure sealing structure for the new energy vehicle as claimed in any one of claims 1 to 7, wherein an opening of the dynamic pressure groove (11) is located on an inner diameter side of an end face of the dynamic ring (2).

10. The high-speed hydrodynamic pressure sealing structure for the new energy vehicle according to claim 9, wherein the dynamic pressure groove (11) is a T-shaped groove.

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