Non-contact sealing protection structure

Abstract

The utility model provides a non-contact sealing protective structure, which relates to the technical field of machine tool spindles and comprises a spindle rotator, a spindle non-rotator, a protective cover, an end cover, a central spindle, an inner labyrinth ring, an outer labyrinth ring and an air curtain ring groove. The main shaft rotating body is located in the main shaft non-rotating body, the protective cover is installed on the outer side of the end cover, the protective cover and the main shaft rotating body are fixed through a bolt, the end cover is arranged on the periphery of the shaft core in a sleeving mode, the end cover and the main shaft non-rotating body are fixed through a bolt, and an air curtain ring groove is formed by the end cover and the main shaft non-rotating body. The inner labyrinth ring serving as a part of a main shaft rotating body is combined with the outer labyrinth ring serving as a part of a main shaft non-rotating body; according to the non-contact type sealing protection structure, the sealing performance of the main shaft under the severe machining environment is effectively improved by comprehensively applying the labyrinth sealing technology, the dynamic pressure sealing technology and the air curtain sealing technology, and the normal service life and the machining precision of the main shaft bearing are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe spindle technical field especially relates to a non -contact type sealed protection structure. BACKGROUND

[0002] The current spindle non -contact type sealed form mainly adopts single sealed structure, for example, air curtain sealing, labyrinth sealing etc.;But in the harsh processing environment, for example, dust, oil mist, high temperature etc. exist, these single sealed structure is difficult to effectively prevent the impurity from entering the spindle inside, leads to bearing wear, performance decline even failure, influences equipment normal operation and processing accuracy, therefore, we propose a non -contact type sealed protection structure. UTILITY MODEL CONTENT

[0003] The utility model discloses a kind of non -contact type sealed protection structures, which is innovatively combined with air curtain sealing, multi-stage labyrinth sealing and dynamic pressure sealing, to form a more powerful multi-stage composite sealing system.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A non -contact type sealed protection structure, comprising spindle rotating body, spindle non -rotating body, protective cover, end cover, shaft core, inner labyrinth ring, outer labyrinth ring and air curtain ring groove;

[0006] The spindle rotating body is located inside the spindle non -rotating body, the protective cover is installed on the outer side of end cover, and the protective cover is fixed with the spindle rotating body by bolt, the end cover is sleeved on the periphery of shaft core, and the end cover is fixed with the spindle non -rotating body by bolt, the end cover and the spindle non -rotating body form air curtain ring groove, the inner labyrinth ring as a part of spindle rotating body and the outer labyrinth ring as a part of spindle non -rotating body are combined together, and each side respectively adheres end cover and shaft core to form deceleration chamber.

[0007] Further, the radial clearance between the protective cover and the end cover is 0.1mm~0.2mm.

[0008] Further, the radial clearance between the end cover and the shaft core is 0.2mm~0.3mm, and three annular grooves are annularly provided.

[0009] Further, the three radial clearances between the inner labyrinth ring and the outer labyrinth ring from outside to inside are 0.1mm~0.2mm, 0.2mm~0.3mm and 1mm.

[0010] Further, the gas curtain ring groove is uniformly distributed with small holes and communicated with the speed reduction chamber formed by the end cover and the shaft core.

[0011] Compared with the prior art, the utility model has the advantages of:

[0012] The sealing protection structure integrates three non-contact sealing protection structures (gas curtain sealing, multi-stage labyrinth sealing and dynamic pressure sealing), and the three sealing structures cooperate to form a more powerful sealing structure.

[0013] The gas curtain sealing utilizes compressed air to form internal positive pressure to prevent impurities from invading the inside of the main shaft;

[0014] The multi-stage labyrinth sealing forms a sealing effect during the operation of the main shaft through the radial small gap between the rotating body and the non-rotating body;

[0015] The dynamic pressure sealing utilizes the Bernoulli principle, the front end shaft diameter of the rotating body is larger than the rear end shaft diameter, and during rotation, the front end linear velocity is larger, a pressure difference is formed, and a positive pressure is formed from the inside to the outside to prevent impurities from entering;

[0016] In summary, the non-contact sealing protection structure effectively improves the sealing performance of the main shaft in a harsh machining environment by comprehensively applying the three technologies of labyrinth sealing, dynamic pressure sealing and gas curtain sealing, and ensures the normal service life and machining precision of the main shaft bearing. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The utility model provides a kind of non-contact sealing protection structure's overall structure schematic diagram;

[0018] Fig. 2 The utility model provides a kind of non-contact sealing protection structure's overall structure dissection schematic diagram;

[0019] Fig. 3 The utility model provides a kind of non-contact sealing protection structure's A local structure amplification schematic diagram.

[0020] Legend: 1, main shaft rotating body;2, main shaft non-rotating body;3, protective cover;4, end cover;5, shaft core;6, inner labyrinth ring;7, outer labyrinth ring;8, gas curtain ring groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] For the convenience of understanding the utility model, the following will be described in relation to the utility model more fully, given several embodiments of the utility model, however, the utility model can be realized in many different forms, and is not limited to the embodiments described herein, on the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0023] Need to explain, when the element is called "fixed to" another element, it can be directly on another element or there can be a central element, when an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a central element, the terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs, the terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the utility model, the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Embodiment 1

[0026] As Figs. 1-3 Indicated, the utility model provides a technical scheme: a kind of non-contact sealing protection structure, including main shaft rotating body 1, main shaft non-rotating body 2, protective cover 3, end cap 4, shaft core 5, inner labyrinth ring 6, outer labyrinth ring 7 and air curtain ring groove 8;

[0027] Main shaft rotating body 1 is located inside main shaft non-rotating body 2, protective cover 3 is installed on the outside of end cap 4, and protective cover 3 is fixed with main shaft rotating body 1 by bolt, end cap 4 is sleeved on the periphery of shaft core 5, and end cap 4 is fixed with main shaft non-rotating body 2 by bolt, end cap 4 and main shaft non-rotating body 2 are formed with air curtain ring groove 8, inner labyrinth ring 6 as a part of main shaft rotating body 1 and outer labyrinth ring 7 as a part of main shaft non-rotating body 2 are combined together, and one side is respectively adhered to end cap 4 and shaft core 5 to form deceleration chamber.

[0028] Air curtain ring groove 8 is uniformly distributed with small hole and deceleration chamber formed by end cap 4 and shaft core 5 is communicated.

[0029] Among them, main shaft in the process of operation, through the radial clearance between main shaft rotating body 1 and main shaft non-rotating body 2 form labyrinth seal and dynamic pressure seal;

[0030] And compressed air enters air curtain ring groove 8, and is uniformly sprayed into the inside of main shaft through uniformly distributed small holes to form air curtain seal.

[0031] Example 2

[0032] As shown, the radial gap between the protective cover 3 and the end cover 4 is 0.1mm~0.2mm. Figs. 1-3

[0033] The radial gap between the end cover 4 and the shaft core 5 is 0.2mm~0.3mm, and three annular grooves are correspondingly formed.

[0034] The three radial gaps between the inner labyrinth ring 6 and the outer labyrinth ring 7 from the outside to the inside are 0.1mm~0.2mm, 0.2mm~0.3mm, and 1mm.

[0035] The working principle of the non-contact sealing protection structure is as follows:

[0036] 1) Labyrinth seal: from the outside to the inside, the protective cover 3 and the end cover 4 form a primary labyrinth, and the protective cover 3 is thrown away from the end cover by centrifugal force, and the radial gap between the protective cover 3 and the end cover 4 is 0.1mm~0.2mm.

[0037] The end cover 4 and the shaft core 5 form a secondary labyrinth, and the annular grooves of the end cover 4 and the shaft core 5 prevent liquid from flowing in the axial direction in a non-rotating state, and form three converging pressure reduction cavities, and the radial gap between the end cover 4 and the shaft core 5 is 0.2mm~0.3mm.

[0038] The inner labyrinth ring 6 and the outer labyrinth ring 7 form a final labyrinth, which includes a primary labyrinth, a deceleration cavity, a secondary labyrinth, and a final 1mm radial gap to avoid capillary effect.

[0039] 2) Dynamic pressure seal: from the outside to the inside, the rotating shaft diameter of the protective cover 3 is the largest, and the rotating shaft diameter of the inner labyrinth ring 6 is the smallest, and during the rotation process, the linear velocity of the front end is greater than that of the rear end, and the pressure of the front end is less than that of the rear end, so air moves from the rear end to the front end, and a dynamic pressure seal effect is formed.

[0040] 3) Air curtain seal: compressed air enters the air curtain ring groove 8, enters the deceleration chamber formed by the end cover 4 and the shaft core 5 through the uniformly distributed small holes, and the radial gap between the end cover 4 and the shaft core 5 is greater than the radial gap formed by the primary labyrinth of the inner labyrinth ring 6 and the outer labyrinth ring 7, so the flow of compressed air between the end cover 4 and the shaft core 5 will be larger, and the compressed air will be preferentially discharged to the front end, and the compressed air will be uniformly blown out from the inside to the outside, forming a positive pressure to prevent impurities from entering the interior of the main shaft.

[0041] ​Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-contact sealed containment structure, characterized by: It comprises a main shaft rotating body (1), a main shaft non-rotating body (2), a protective cover (3), an end cover (4), a shaft core (5), an inner labyrinth ring (6), an outer labyrinth ring (7) and a gas curtain ring groove (8). The main shaft rotating body (1) is located inside the main shaft non-rotating body (2), the protective cover (3) is installed outside the end cover (4), and the protective cover (3) and the main shaft rotating body (1) are fixed by bolts, the end cover (4) is sleeved outside the shaft core (5), and the end cover (4) and the main shaft non-rotating body (2) are fixed by bolts, the end cover (4) and the main shaft non-rotating body (2) are formed with the gas curtain ring groove (8), the inner labyrinth ring (6) as a part of the main shaft rotating body (1) and the outer labyrinth ring (7) as a part of the main shaft non-rotating body (2) are combined together, and one side respectively adheres to the end cover (4) and the shaft core (5) to form a speed reduction chamber.

2. A non-contact seal guard structure according to claim 1, wherein: The radial gap between the protective cover (3) and the end cover (4) is 0.1mm-0.2mm.

3. The non-contact containment shield of claim 1, wherein: The radial gap between the end cover (4) and the shaft core (5) is 0.2mm-0.3mm, and three annular grooves are correspondingly arranged in the annular.

4. The non-contact containment shield of claim 1, wherein: The three radial gaps between the inner labyrinth ring (6) and the outer labyrinth ring (7) are 0.1mm-0.2mm, 0.2mm-0.3mm and 1mm from outside to inside.

5. The non-contact containment shield of claim 1, wherein: The gas curtain ring groove (8) is uniformly distributed with small holes and communicates with the speed reduction chamber formed by the end cover (4) and the shaft core (5).

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