Three-level structure non-contact type sealing structure used on precision main shaft

Abstract

The utility model relates to the technical field of precision main shaft sealing, in particular to a three-level structure non-contact type sealing structure used on a precision main shaft, which comprises a main shaft body, a splash guard fixedly arranged on the surface of the main shaft body, a shaft seat end cover arranged on the surface of the main shaft body and a sealing mechanism arranged on the surface of the main shaft body. The sealing mechanism comprises an annular groove, the annular groove is formed in the surface of the main shaft body, and a first sewage discharging cavity is formed in the shaft seat end cover. According to the three-stage non-contact sealing structure used on the precise main shaft, the sealing mechanism is arranged on the surface of the main shaft body, the main shaft body is protected through multi-stage labyrinth type sealing, and due to the fact that parts are arranged in the axial direction and the radial direction in a crossed mode, pollutants and cutting fluid are difficult to enter a bearing; the problem that according to existing non-contact type gap sealing, pollutants and cutting fluid are likely to enter a bearing to cause pollution, and follow-up main shaft work is affected is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to precision main shaft sealing technical field, concretely is a three -level structure non -contact type sealing structure used on precision main shaft. BACKGROUND

[0002] Non -contact type sealing refers to full a layer complete fluid film between sealing end face, force sealing end face each other to separate and do not exist hard solid contact mechanical sealing of fluid static pressure or dynamic pressure effect, usually used for high -speed precision application, and its effect depends on the narrow gap sealing effect between the shaft and bearing seat in principle, since there is no contact, these seals almost do not produce friction, and also do not limit the speed on the use, thus become the perfect solution for machine tool application.

[0003] The existing non -contact type gap sealing since its single sealing channel, easy to make the pollutants and cutting fluid enter the bearing and cause pollution, influence the subsequent main shaft work, reduce bearing life, can not satisfy the needs of the society, therefore put forward a kind of three -level structure non -contact type sealing structure used on precision main shaft to solve the above -mentioned problem. UTILITY MODEL CONTENT

[0004] In view of the deficiency of prior art, the utility model provides a three -level structure non -contact type sealing structure used on precision main shaft, has cross protection and so on, solves the problem that the existing non -contact type gap sealing is easy to make the pollutants and cutting fluid enter the bearing and cause pollution, influence the subsequent main shaft work, reduce bearing life.

[0005] In order to realize the above -mentioned cross protection purposes, the utility model provides the following technical scheme: a three -level structure non -contact type sealing structure used on precision main shaft, including main shaft body, the surface of main shaft body is fixedly installed with splash guard, the surface of main shaft body is provided with shaft seat end cover, the surface of main shaft body is provided with sealing mechanism;

[0006] The sealing mechanism includes annular groove, the surface of main shaft body is provided with annular groove, the inside of shaft seat end cover is provided with blowdown chamber one, the bottom of shaft seat end cover is provided with blowdown hole one, the surface of main shaft body is fixedly installed with labyrinth ring, the top of labyrinth ring is provided with liquid speed reduction chamber, the inside of liquid speed reduction chamber is provided with collection ring, the top of collection ring is provided with blowdown chamber two, the top of labyrinth ring is provided with gap hole, the bottom of liquid speed reduction chamber is provided with blowdown hole two, the bottom end of blowdown hole one is provided with stop block, the inside of shaft seat end cover is provided with water inlet hole, the top of shaft seat end cover is provided with mounting end block, the surface of labyrinth ring is fixedly installed with compensation block, the inside of compensation block is provided with filter screen.

[0007] Further, the splash-proof cover is fixedly installed on the surface of the main shaft body through coaxial positioning and interference fit, and the shaft seat end cover is gap-fitted with the main shaft body.

[0008] Further, the inner diameter of the first blow-off hole is larger than that of the second blow-off hole.

[0009] Further, the collection ring is fixedly installed with the shaft seat end cover.

[0010] Further, the blocking block is fixedly installed at the bottom end of the first blow-off hole through threads.

[0011] Further, the compensation block is fixedly installed on the surface of the labyrinth ring through threads, and the compensation block is extruded with the shaft seat end cover.

[0012] Compared with the prior art, the technical scheme has the following beneficial effects:

[0013] 1. The three-level structure non-contact sealing structure used on the precision main shaft is provided with a sealing mechanism on the surface of the main shaft body, the device adopts multi-stage labyrinth sealing to protect the main shaft body, the axial and radial cross arrangement of parts can make it difficult for pollutants and cutting fluid to enter the bearing, and the problems that the existing non-contact gap sealing is easy to cause pollutants and cutting fluid to enter the bearing to cause pollution, affect the subsequent main shaft work, and reduce the service life of the bearing are solved.

[0014] 2. The three-level structure non-contact sealing structure used on the precision main shaft is provided with a splash-proof cover on the surface of the main shaft body, the splash-proof cover 2 is dragged by the main shaft body and helps the centrifugal force to throw away the pollutants from the shaft seat end cover 3, the pollutants are prevented from directly entering the sealing mechanism, the first blow-off cavity and the first blow-off hole are arranged, when the main shaft body rotates, the pollutants can be thrown out from the annular groove and concentrated to the first blow-off cavity, and then flow out through the first blow-off hole, so that the pollutants are prevented from entering the main shaft body, and the problems that the existing non-contact gap sealing is easy to cause pollutants and cutting fluid to enter the bearing to cause pollution, affect the subsequent main shaft work, and reduce the service life of the bearing are solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model;

[0016] Figure 2 It is a structural schematic view of the sealing mechanism of the utility model;

[0017] Figure 3 It is a structural schematic view of the utility model Figure 2 A structure schematic view of the utility model.

[0018] In the figure: 1, main shaft body; 2, splash guard; 3, shaft seat end cover; 4, sealing mechanism; 401, annular groove; 402, pollution discharge cavity one; 403, pollution discharge hole one; 404, labyrinth ring; 405, liquid speed reduction cavity; 406, collection ring; 407, pollution discharge cavity two; 408, gap hole; 409, pollution discharge hole two; 410, block; 411, water inlet hole; 412, mounting end block; 413, compensation block; 414, filter screen. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] Please refer to Figures 1-3 The three-stage structure non-contact sealing structure used on the precision spindle in the embodiment comprises a main shaft body 1, a splash guard 2 is fixedly installed on the surface of the main shaft body 1, the splash guard 2 helps the centrifugal force to throw the pollutants away from the shaft seat end cover 3, prevents the pollutants from directly entering the sealing mechanism 4, the surface of the main shaft body 1 is provided with the shaft seat end cover 3, the radial gap between the shaft seat end cover 3 and the main shaft body 1 is small, and the surface of the main shaft body 1 is provided with the sealing mechanism 4.

[0021] The sealing mechanism 4 comprises an annular groove 401, the surface of the main shaft body 1 is provided with the annular groove 401, the annular groove 401 can prevent the contaminated liquid from flowing in the axial direction in the non-rotating state and introducing it into the first pollution cavity 402 under the centrifugal force, the inside of the shaft seat end cover 3 is provided with the first pollution cavity 402, the bottom of the shaft seat end cover 3 is provided with a first pollution hole 403, the large-size first pollution hole 403 is used to limit the accumulation of liquid in the first pollution cavity 402 and can discharge most of the pollutants, the surface of the main shaft body 1 is fixedly provided with a labyrinth ring 404, the top of the labyrinth ring 404 is provided with a liquid deceleration cavity 405, the inside of the liquid deceleration cavity 405 is provided with a collecting ring 406, the top of the collecting ring 406 is provided with a second pollution cavity 407, the top of the labyrinth ring 404 is provided with a gap hole 408, the gap hole 408 can avoid the capillary effect of the liquid, the bottom of the liquid deceleration cavity 405 is provided with a second pollution hole 409, the bottom end of the first pollution hole 403 is provided with a plug 410, when the internal components are cleaned, the plug 410 is installed to facilitate the cleaning of foreign matters in the first pollution cavity 402 and the cleaning of residual contaminated liquid in the second pollution cavity 407, the inside of the shaft seat end cover 3 is provided with a water inlet hole 411, the top of the shaft seat end cover 3 is provided with a mounting end block 412, when the sealing mechanism 4 is used for a period of time, the mounting end block 412 is externally connected with a water pipe to clean the inside of the sealing mechanism 4, prevent the residual pollutants in the internal structure, and improve the service life of the components, the surface of the labyrinth ring 404 is fixedly provided with a compensation block 413, the inside of the compensation block 413 is provided with a filter screen 414, the filter screen 414 can prevent iron filings or large-particle foreign matters from flowing into the liquid deceleration cavity 405 to cause the blockage of the second pollution cavity 407.

[0022] In summary, the three-level structure non-contact sealing structure used on the precision spindle, through the surface of the main shaft body 1 provided with the sealing mechanism 4, the device adopts multi-stage labyrinth sealing to protect the main shaft body 1, because the axial and radial cross arrangement of parts can make it difficult for pollutants and cutting fluid to enter the bearing, solve the problem that the existing non-contact gap sealing is easy to make pollutants and cutting fluid enter the bearing to cause pollution, affect the subsequent spindle work and reduce the service life of the bearing.

[0023] At the same time, through the surface of the main shaft body 1 provided with the splash guard 2, the splash guard 2 is dragged by the main shaft body 1 and helps the centrifugal force to throw away the pollutants from the shaft seat end cover 3, prevents the pollutants from directly entering the sealing mechanism 4, through the setting of the first pollution cavity 402 and the first pollution hole 403, when the main shaft body 1 rotates, the pollutants can be thrown out from the annular groove 401 and concentrated in the first pollution cavity 402, and then flow out through the first pollution hole 403, avoiding the pollutants from entering the main shaft body 1, solving the problem that the existing non-contact gap sealing is easy to make pollutants and cutting fluid enter the bearing to cause pollution, affect the subsequent spindle work and reduce the service life of the bearing.

[0024] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the description herein. It must be noted that, as used in the specification and the appended claims, the singular form "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. Presently preferred embodiments are described herein, including the best mode known to the inventors of practicing the application. Of course, variations on these preferred embodiments will become apparent to those of ordinary skill in the art once the nature of the application has been disclosed herein. Accordingly, the present application is not intended to be limited to the preferred embodiments set forth herein and it is contemplated that other embodiments and / or variations that do not provide a contribution, relatively minor contributions, conservative contributions, insubstantial contributions, or de minimis contributions to the progression of the art can nevertheless be within the scope of the application. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application being indicated by the following claims. For a more complete understanding of the present application, reference is now made to the following descriptions taken in connection with the accompanying drawings in which: Various aspects of the present application are described in further detail in terms of the following items:

[0025] While the embodiments of the present application have been illustrated and described, it will be clear to those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the present application. The scope of the present application is not to be limited by the specific embodiments disclosed in the specification.

Claims

1. A three-stage structure non-contact seal structure used on a precision spindle, comprising a spindle body (1), characterized in that: The surface of the main shaft body (1) is fixedly installed with a splash-proof cover (2), the surface of the main shaft body (1) is provided with a shaft seat end cover (3), and the surface of the main shaft body (1) is provided with a sealing mechanism (4); The sealing mechanism (4) comprises an annular groove (401) formed in the surface of the main shaft body (1), a sewage cavity I (402) formed in the inside of the shaft seat end cover (3), a sewage hole I (403) formed in the bottom of the shaft seat end cover (3), a labyrinth ring (404) fixedly installed on the surface of the main shaft body (1), a liquid speed reduction cavity (405) formed in the top of the labyrinth ring (404), a collection ring (406) arranged in the inside of the liquid speed reduction cavity (405), a sewage cavity II (407) formed in the top of the collection ring (406), a gap hole (408) formed in the top of the labyrinth ring (404), a sewage hole II (409) formed in the bottom of the liquid speed reduction cavity (405), a plug (410) arranged at the bottom end of the sewage hole I (403), a water inlet hole (411) formed in the inside of the shaft seat end cover (3), an installation end block (412) arranged on the top of the shaft seat end cover (3), a compensation block (413) fixedly installed on the surface of the labyrinth ring (404), and a filter screen (414) arranged in the inside of the compensation block (413).

2. A three-stage non-contact seal structure used on a precision spindle according to claim 1, characterized in that: The splash-proof cover (2) is fixedly installed on the surface of the main shaft body (1) through coaxial positioning and interference fit, and the shaft seat end cover (3) is in clearance fit with the main shaft body (1).

3. A three-stage structure non-contact seal structure used on a precision spindle according to claim 1, characterized in that: The inner diameter of the sewage hole I (403) is larger than that of the sewage hole II (409).

4. A three-stage structure non-contact seal structure used on a precision spindle according to claim 1, characterized in that: The collection ring (406) is fixedly installed with the shaft seat end cover (3).

5. A three-stage structure non-contact seal structure used on a precision spindle according to claim 1, characterized in that: The plug (410) is fixedly installed at the bottom end of the sewage hole I (403) through screwing.

6. A three-stage structure non-contact seal structure used on a precision spindle according to claim 1, characterized in that: The compensation block (413) is fixedly installed on the surface of the labyrinth ring (404) through screwing, and the compensation block (413) is in extrusion fit with the shaft seat end cover (3).

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