CN211449644U - Main shaft air curtain sealing device - Google Patents

Abstract

The utility model discloses a main shaft air curtain sealing device, including the inner circle and the outer lane of mutually supporting, be equipped with sealed air cavity between outer lane and the inner circle, be equipped with the inlet port of the sealed air cavity of intercommunication on the outer wall of outer lane, the equipartition has a plurality of ventholes that run through on the circumference of inner circle, the sealed air cavity of venthole intercommunication. This main shaft air curtain sealing device, the inlet port passes through the trachea and inserts external compressed air, compressed air gets into sealed air cavity along the inlet port, sealed air cavity plays and stores pressure boost and transitional action, the inner circle equipartition has the venthole, compressed air gets into each venthole through sealed air cavity, realize evenly giving vent to anger with this, act on the main shaft diameter from all directions, thereby form the air curtain, effectively prevent outside water, vapour, oil impurity such as oil from getting into inside the main shaft, and outer lane and inner circle do not contact with the main shaft, it is not fragile, improve sealed reliability, this utility model is used for sealed technical field.

Description

Main shaft air curtain sealing device

Technical Field

The utility model relates to a sealed technical field especially relates to a main shaft gas curtain sealing device.

Background

The existing machine tool electric spindle is mainly sealed by a sealing ring. The sealing ring is easy and convenient to install and replace, but is easily aged and damaged due to factors such as extrusion or contact friction and the like caused by the influence of processing conditions during processing, and the sealing performance is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a main shaft gas curtain sealing device, improve the sealing reliability.

According to the embodiment of the utility model, a main shaft air curtain sealing device is provided, including inner circle and the outer lane of mutually supporting, be equipped with sealed air cavity between outer lane and the inner circle, be equipped with the intercommunication on the outer wall of outer lane the inlet port of sealed air cavity, the equipartition has a plurality of ventholes that run through on the circumference of inner circle, the venthole intercommunication sealed air cavity.

According to the embodiment of the utility model provides a main shaft air curtain sealing device, the both sides of sealed air cavity are inboard and the outside respectively, the length dimension of outer lane inboard is greater than the length dimension in the outside in the axial direction.

According to the utility model discloses main shaft gas curtain sealing device, the inboard of outer lane is equipped with a plurality of shoulder holes.

According to the embodiment of the utility model provides a main shaft gas curtain sealing device, the shoulder hole is including the first shoulder hole, second shoulder hole and the third shoulder hole that set gradually, the aperture size in second shoulder hole, third shoulder hole and first shoulder hole reduces in proper order.

According to the embodiment of the utility model provides a main shaft gas curtain sealing device, be equipped with first ring channel on the circumference outer wall of inner circle, first ring channel with the inner wall of outer lane encloses into sealed air cavity.

According to the utility model discloses main shaft gas curtain sealing device, be equipped with the second annular groove on the inner wall of inner circle, the venthole is connected first annular groove and second annular groove.

According to the utility model discloses main shaft gas curtain sealing device, the both sides of first ring channel are equipped with first outer fringe and second outer fringe respectively, the diameter of first outer fringe is greater than the diameter of second outer fringe, be equipped with on the inner wall of outer lane with first outer fringe complex first step wall and with second outer fringe complex second step wall.

According to the utility model discloses main shaft gas curtain sealing device, the inner circle with outer lane interference fit.

Has the advantages that: this main shaft air curtain sealing device, the inlet port passes through the trachea and inserts external compressed air, compressed air gets into sealed air cavity along the inlet port, sealed air cavity plays and stores pressure boost and transitional action, the inner circle equipartition has the venthole, compressed air gets into each venthole through sealed air cavity, with this realization is evenly given vent to anger, act on the main shaft diameter from all directions, thereby form the air curtain, effectively prevent outside water, vapour, oil impurity gets into inside the main shaft, and outer lane and inner circle do not contact with the main shaft, it is not fragile, improve the sealing reliability.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an inner race and an outer race of an embodiment of the present invention;

figure 3 is a side view of an inner race of an embodiment of the present invention;

fig. 4 is a schematic three-dimensional structure diagram of the inner ring and the outer ring of the embodiment of the present invention;

reference numerals: the sealing structure comprises an inner ring 10, an air outlet hole 11, a first annular groove 12, a second annular groove 13, a first outer edge 14, a second outer edge 15, an outer ring 20, an air inlet hole 21, a first stepped wall 22, a second stepped wall 23, a first stepped hole 24, a second stepped hole 25, a third stepped hole 26 and a sealing air cavity 30.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1-4, the embodiment of the present invention provides a spindle air curtain sealing device, including inner circle 10 and outer lane 20 of mutually supporting, be equipped with sealed air cavity 30 between outer lane 20 and the inner circle 10, be equipped with the inlet port 21 of the sealed air cavity 30 of intercommunication on the outer wall of outer lane 20, the equipartition has a plurality of ventholes 11 that run through on the circumference of inner circle 10, the sealed air cavity 30 of venthole 11 intercommunication.

The main shaft air curtain sealing device of this embodiment, inlet port 21 passes through the trachea and inserts external compressed air, compressed air gets into sealed air cavity 30 along inlet port 21, sealed air cavity 30 plays and stores pressure boost and transitional action, the 10 equipartitions of inner circle have venthole 11, compressed air gets into each venthole 11 through sealed air cavity 30, with this realization is evenly given vent to anger, act on the main shaft diameter from all directions, thereby form the air curtain, effectively prevent outside water, vapour, inside oil impurity gets into the main shaft, and outer lane 20 and inner circle 10 do not contact with the main shaft, it is not fragile, sealing reliability is improved.

Referring to fig. 2, a first annular groove 12 is formed on the circumferential outer wall of the inner ring 10, and the first annular groove 12 and the inner wall of the outer ring 20 enclose a sealed air cavity 30. It will be appreciated that an annular groove may be provided on the inner wall of the outer ring 20, the annular groove and the outer wall of the inner ring 10 enclosing the sealed air chamber 30.

Further, a second annular groove 13 is formed in the inner wall of the inner ring 10, and the air outlet hole 11 is connected with the first annular groove 12 and the second annular groove 13. The compressed air flows from the respective air outlet holes 11 to the second annular groove 13 through the sealed air chamber 30, and an annular air curtain is formed at the second annular groove 13, which effectively prevents foreign substances from entering the inside of the main shaft.

In this embodiment, the first annular groove 12 is provided with a first outer edge 14 and a second outer edge 15 on two sides, the diameter of the first outer edge 14 is larger than that of the second outer edge 15, and the inner wall of the outer ring 20 is provided with a first step wall 22 engaged with the first outer edge 14 and a second step wall 23 engaged with the second outer edge 15. The first outer edge 14 and the second outer edge 15 are respectively matched with the first step wall 22 and the second step wall 23, so that the inner ring 10 and the outer ring 20 are positioned and assembled, and the end surfaces of the inner ring 10 and the outer ring 20 are flush after the assembly.

In the present embodiment, two sides of the seal air chamber 30 are respectively an inner side and an outer side, a side close to the inside of the main shaft is the inner side, a side far away from the inside of the main shaft is the outer side, and the length of the inner side of the outer ring 20 in the axial direction is greater than that of the outer side. The gas acts on the shaft diameter and flows towards both sides, the length dimension of the inner side of the outer ring 20 is larger than that of the outer side, so that the flowing path force of the gas towards the outer side is relatively short, the flowing speed towards the inner side is relatively high, a gas pressure difference is formed, and the pressure of the inner side is larger than that of the outer side, so that the sealing performance is further improved, and impurities are prevented from entering the main shaft.

Further, the inner side of the outer ring 20 is provided with a plurality of stepped holes, which prolongs the road strength of the gas flowing inwards and increases the gas pressure difference. Specifically, the stepped holes include a first stepped hole 24, a second stepped hole 25 and a third stepped hole 26 which are sequentially arranged, and the pore sizes of the second stepped hole 25, the third stepped hole 26 and the first stepped hole 24 are sequentially reduced, so that a zigzag road strength is formed, and the inward flowing speed of gas is reduced. In this embodiment, the third stepped bore 26 mates with a corresponding stepped shaft on the main shaft.

In the present embodiment, the inner race 10 and the outer race 20 are connected by interference fit.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (8)

1. A main shaft air curtain sealing device is characterized in that: the sealing device comprises an inner ring and an outer ring which are matched with each other, a sealing air cavity is arranged between the outer ring and the inner ring, an air inlet hole communicated with the sealing air cavity is formed in the outer wall surface of the outer ring, a plurality of penetrating air outlets are uniformly distributed on the circumference of the inner ring, and the air outlets are communicated with the sealing air cavity.

2. The spindle air curtain seal of claim 1, wherein: the two sides of the sealed air cavity are respectively the inner side and the outer side, and the length dimension of the inner side of the outer ring in the axial direction is larger than that of the outer side of the outer ring.

3. The spindle air curtain seal of claim 2, wherein: the inner side of the outer ring is provided with a plurality of stepped holes.

4. The spindle air curtain seal of claim 3 wherein: the shoulder hole is including the first shoulder hole, second shoulder hole and the third shoulder hole that set gradually, the aperture size in second shoulder hole, third shoulder hole and first shoulder hole reduces in proper order.

5. The main shaft air curtain sealing device according to any one of claims 1 to 4, characterized in that: and a first annular groove is formed in the circumferential outer wall of the inner ring, and the first annular groove and the inner wall of the outer ring form the sealed air cavity.

6. The spindle air curtain seal of claim 5, wherein: and a second annular groove is formed in the inner wall of the inner ring, and the air outlet hole is connected with the first annular groove and the second annular groove.

7. The spindle air curtain seal of claim 5, wherein: the both sides of first ring channel are equipped with first outer fringe and second outer fringe respectively, the diameter of first outer fringe is greater than the diameter of second outer fringe, be equipped with on the inner wall of outer lane with first outer fringe complex first step wall and with second outer fringe complex second step wall.

8. The spindle air curtain seal of claim 1, wherein: the inner ring is in interference fit with the outer ring.

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