Rotating shaft seal structure

Abstract

The present invention discloses a rotary shaft sealing structure, comprising a rotary shaft (1), an end cover (2) and a housing (4), wherein the rotary shaft (1) is provided with two shaft shoulders, namely a first shaft shoulder (1a) and a second shaft shoulder (1d) arranged from outside to inside, and a plurality of oil-slinging grooves are provided between the two shaft shoulders; the end cover (2) is provided with a plurality of inner shoulder oil-draining grooves corresponding to the plurality of oil-slinging grooves and a first oil-draining hole (2b) connected to the plurality of inner shoulder oil-draining grooves. The rotary shaft sealing structure provided by the present invention has a simple structure and is easy to process; moreover, it effectively improves the sealing reliability and ensures the service life and rotation accuracy of the rotary shaft.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool equipment, and in particular to a rotary shaft sealing structure. Background Art

[0002] The working environment of the machine tool is full of oil mist containing grinding slag. If this oil mist enters the interior of the machine tool spindle, it will seriously affect the spindle life and rotation accuracy.

[0003] At present, the main shaft seal structure commonly used in machine tools is gas seal or end face labyrinth seal. The structure of gas seal is simple, but the sealing effect is not ideal; while the sealing effect of end face labyrinth seal is higher, but the structure is too complicated and not easy to process.

[0004] Therefore, how to facilitate processing and improve sealing reliability has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a rotary shaft sealing structure to facilitate processing and improve sealing reliability.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A rotary shaft sealing structure, comprising a rotary shaft, an end cover and a housing, wherein the rotary shaft is provided with two shaft shoulders, namely a first shaft shoulder and a second shaft shoulder arranged from outside to inside, and a plurality of oil throwing grooves are provided between the two shaft shoulders;

[0008] The end cover is provided with a plurality of inner-shoulder oil leakage grooves arranged corresponding to the plurality of oil-slinging grooves and a first oil leakage hole connected with the plurality of inner-shoulder oil leakage grooves.

[0009] Preferably, in the above-mentioned rotary shaft sealing structure, the end cover further comprises a shaft shoulder external leakage oil groove arranged corresponding to the outer shaft section of the rotary shaft and a second oil leakage hole communicating with the shaft shoulder external leakage oil groove;

[0010] The outer shaft section is a shaft section of the rotating shaft located at the first shaft shoulder and away from the second shaft shoulder.

[0011] Preferably, in the above-mentioned rotating shaft sealing structure, the end cover has an end cover rib which is gap-matched with the first shaft shoulder.

[0012] Preferably, the above-mentioned rotary shaft sealing structure further comprises an air distributor block for blowing air from the inside to the outside, and the end cover is provided with an air inlet channel connected with the air inlet of the air distributor block;

[0013] The air distributor block is arranged between the second shaft shoulder and the oil throwing groove closest thereto.

[0014] Preferably, in the above-mentioned rotating shaft sealing structure, the air dividing block has an air dividing block rib which is gap-matched with the second shaft shoulder.

[0015] Preferably, in the above-mentioned rotating shaft sealing structure, the air distributor block is fixedly connected to the end cover and the box body.

[0016] Preferably, in the above-mentioned rotary shaft sealing structure, the number of the oil-slinging grooves is two, namely a first oil-slinging groove and a second oil-slinging groove arranged from outside to inside;

[0017] The end cover is provided with two inner oil drain grooves of the shaft shoulder, which are respectively a first inner oil drain groove of the shaft shoulder and a second inner oil drain groove of the shaft shoulder arranged from outside to inside;

[0018] The oil leakage groove in the first shaft shoulder is arranged correspondingly to the first oil-slinging groove, and the oil leakage groove in the second shaft shoulder is arranged correspondingly to the second oil-slinging groove.

[0019] Preferably, in the above-mentioned rotary shaft sealing structure, the width of the oil leakage groove in the first shaft shoulder is greater than the width of the first oil throwing groove;

[0020] And / or, the width of the oil leakage groove in the second shoulder is greater than the width of the second oil throwing groove.

[0021] Preferably, the above-mentioned rotary shaft sealing structure further includes a joint and an elbow;

[0022] The elbow is communicated with the first oil drain hole through the joint.

[0023] Preferably, in the above-mentioned rotating shaft sealing structure, the oil-slinging groove consists of an inner side surface and an outer side surface; the inner side surface is perpendicular to the axis of the rotating shaft, and the angle between the outer side surface and the inner side surface is 45° to 60°.

[0024] In the above technical solution, the rotary shaft sealing structure provided by the present invention, through the above arrangement, enables the oil mist to pass through the first shaft shoulder, the cavity formed by the multiple oil-slinging grooves and the inner oil-draining groove of the shaft shoulder, and the second shaft shoulder before reaching the interior of the rotary shaft. Since the multiple inner oil-draining grooves of the shaft shoulder are connected with the first oil-draining hole, the oil mist passes through the cavity formed by the oil-slinging grooves and the inner oil-draining groove of the shaft shoulder, and is discharged from the first oil-draining hole under the action of centrifugal force and airflow. The above rotary shaft sealing structure has a simple structure and is easy to process; moreover, it effectively improves the sealing reliability and ensures the service life and rotation accuracy of the rotary shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a rotary shaft sealing structure provided by an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-section structure along the NN plane;

[0028] Figure 3 A partially enlarged schematic diagram of a rotating shaft sealing structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The core of the present invention is to provide a rotary shaft sealing structure to facilitate processing and improve sealing reliability.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, a rotating shaft sealing structure provided by an embodiment of the present invention includes a rotating shaft 1, an end cover 2 and a housing 4. Two shoulders are arranged on the rotating shaft 1, namely a first shoulder 1a and a second shoulder 1d arranged from outside to inside, and a plurality of oil-slinging grooves are arranged between the two shoulders; the end cover 2 has a plurality of shoulder inner oil leakage grooves arranged corresponding to the plurality of oil-slinging grooves and a first oil leakage hole 2b connected to the plurality of shoulder inner oil leakage grooves.

[0032] The rotary shaft sealing structure provided by the embodiment of the present invention, through the above-mentioned arrangement, enables the oil mist to pass through the first shaft shoulder 1a, the cavity formed by the multiple oil-slinging grooves and the inner oil-draining grooves of the shaft shoulder, and the second shaft shoulder 1d before reaching the interior of the rotary shaft 1. Since the multiple inner oil-draining grooves of the shaft shoulder are connected with the first oil-draining hole 2b, the oil mist passes through the cavity formed by the oil-slinging grooves and the inner oil-draining grooves of the shaft shoulder, and is discharged from the first oil-draining hole 2b under the action of centrifugal force and airflow. The above-mentioned rotary shaft sealing structure has a simple structure and is easy to process; moreover, it effectively improves the sealing reliability and ensures the service life and rotation accuracy of the rotary shaft 1.

[0033] It can be understood that the direction from outside to inside is the arrangement direction from the end cover 2 to the box body 4. Similarly, the direction from inside to outside is the arrangement direction from the box body 4 to the end cover 2. The rotating shaft 1 can be a machine tool spindle or a rotating shaft of other equipment.

[0034] Furthermore, the end cover 2 also has a shoulder leakage oil groove 2c arranged corresponding to the external shaft section of the rotating shaft 1 and a second oil leakage hole 2a connected to the shoulder leakage oil groove 2c; the external shaft section is the shaft section of the rotating shaft 1 located at the first shoulder 1a away from the second shoulder 1d. Through the above arrangement, the shoulder leakage oil groove 2c and the outer wall of the rotating shaft 1 form a cavity, and after the oil mist flows into the cavity, it is discharged from the second oil leakage hole 2a under the action of centrifugal force.

[0035] Furthermore, the end cover 2 is provided with an end cover rib 2d which is clearance-matched with the first shaft shoulder 1a. Through the above arrangement, the flow of oil mist from outside to inside is restricted to a certain extent.

[0036] The rotary shaft sealing structure provided by the embodiment of the present invention also includes a gas distributor block 3 for blowing air from the inside to the outside, and an air inlet channel connected to the air inlet of the gas distributor block 3 is provided on the end cover 2; the gas distributor block 3 is arranged between the second shaft shoulder 1d and the oil slinging groove closest to it. Through the external air source and the air inlet channel, the gas flows from the inside to the outside after passing through the gas distributor block 3, effectively limiting the inward flow trend of the oil mist and further improving the sealing effect.

[0037] like Figure 3 As shown, the gas distributor block 3 has a gas distributor block rib 3g which is in clearance fit with the second shaft shoulder 1d. The above arrangement further improves the sealing effect.

[0038] In this embodiment, the gas distributor block 3 is fixedly connected to the end cover 2 and the box body 4. Through the above arrangement, the air tightness of the contact position between the end cover 2 and the box body 4 is improved; and the structural stability of the rotary shaft sealing structure is improved.

[0039] For the convenience of processing, there are two oil-slinging grooves, namely the first oil-slinging groove 1b and the second oil-slinging groove 1c arranged from outside to inside; the end cover 2 has two inner oil-draining grooves of the shaft shoulder, namely the first inner oil-draining groove 1e and the second inner oil-draining groove 1f arranged from outside to inside; the first inner oil-draining groove 1e of the shaft shoulder is arranged correspondingly to the first oil-slinging groove 1b, and the second inner oil-draining groove 1f of the shaft shoulder is arranged correspondingly to the second oil-slinging groove 1c. Through the above arrangement, two cavities are formed, and the oil mist in these two cavities is collected and discharged after being discharged from the first oil-draining hole 2b. More than three oil-slinging grooves can also be set, which will not be described one by one here and are all within the protection scope.

[0040] In order to ensure the oil drainage effect, the width of the oil leakage groove 1e in the first shoulder is greater than the width of the first oil throwing groove 1b; and the width of the oil leakage groove 1f in the second shoulder is greater than the width of the second oil throwing groove 1c. It is also possible to make only the width of the oil leakage groove 1e in the first shoulder greater than the width of the first oil throwing groove 1b or the width of the oil leakage groove 1f in the second shoulder greater than the width of the second oil throwing groove 1c; the width of the other oil leakage groove in the shoulder is less than or equal to the width of the corresponding oil throwing groove.

[0041] Furthermore, it also includes a joint 5 and an elbow 6; the elbow 6 is connected to the first oil drain hole 2b through the joint 5. Through the above arrangement, the oil mist is effectively blocked from entering the interior of the main shaft. Among them, the structure of the elbow 6 is not limited, and it only needs to meet its guiding function.

[0042] In order to further improve the oil-slinging effect, the oil-slinging groove is composed of an inner side surface and an outer side surface; the inner side surface is perpendicular to the axis of the rotating shaft 1, and the angle between the outer side surface and the inner side surface is 45° to 60°. That is, the oil-slinging groove is a V-shaped groove to prevent oil residue, and the inner side surface is perpendicular to the axis of the rotating shaft 1 to prevent the oil from flowing to the inner side of the rotating shaft 1. Among them, the inner side surface of the oil-slinging groove is the side surface of the oil-slinging groove close to the second shaft shoulder 1d; the outer side surface of the oil-slinging groove is the side surface of the oil-slinging groove close to the first shaft shoulder 1a.

[0043] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0044] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary shaft sealing structure for preventing oil mist from entering the interior of a rotary shaft, comprising a rotary shaft (1), an end cover (2) and a housing (4), characterized in that: The rotating shaft (1) is provided with two shaft shoulders, namely a first shaft shoulder (1a) and a second shaft shoulder (1d) arranged from outside to inside, and a plurality of oil-slinging grooves are provided between the two shaft shoulders. The oil-slinging grooves are located on the rotating shaft (1) and are recessed toward the center of the rotating shaft (1); The end cover (2) is provided with a plurality of inner shoulder oil leakage grooves corresponding to the plurality of oil-slinging grooves and a first oil leakage hole (2b) connected to the plurality of inner shoulder oil leakage grooves, the inner shoulder oil leakage grooves are recessed in a direction away from the rotating shaft (1), and the correspondingly arranged oil-slinging grooves and the inner shoulder oil leakage grooves form a cavity; The rotary shaft sealing structure further comprises an air distributor block (3) for blowing air from the inside to the outside, and the end cover (2) is provided with an air inlet passage connected to the air inlet of the air distributor block (3); the air distributor block (3) is arranged between the second shaft shoulder (1d) and the oil throwing groove closest thereto; The gas distributor block (3) has a gas distributor block rib (3g) which is clearance-matched with the second shaft shoulder (1d); The air intake passage is inclined toward the oil slinging groove along the internal air flow direction thereof.

2. The rotary shaft sealing structure according to claim 1, characterized in that: The end cover (2) also has a shaft shoulder external oil leakage groove (2c) arranged corresponding to the outer shaft section of the rotating shaft (1) and a second oil leakage hole (2a) connected to the shaft shoulder external oil leakage groove (2c); The outer shaft section is a shaft section of the rotating shaft (1) located on the first shaft shoulder (1a) away from the second shaft shoulder (1d).

3. The rotary shaft sealing structure according to claim 2, characterized in that: The end cover (2) is provided with an end cover rib (2d) which is clearance-matched with the first shaft shoulder (1a).

4. The rotary shaft sealing structure according to claim 1, characterized in that: The gas distribution block (3) is fixedly connected to the end cover (2) and the box body (4).

5. The rotary shaft sealing structure according to claim 1, characterized in that: There are two oil-spinning tanks, namely a first oil-spinning tank (1b) and a second oil-spinning tank (1c) arranged from outside to inside; The end cover (2) is provided with two inner shoulder oil leakage grooves, which are arranged from outside to inside, namely a first inner shoulder oil leakage groove (1e) and a second inner shoulder oil leakage groove (1f); The oil leakage groove (1e) in the first shaft shoulder is arranged correspondingly to the first oil-slinging groove (1b), and the oil leakage groove (1f) in the second shaft shoulder is arranged correspondingly to the second oil-slinging groove (1c).

6. The rotary shaft sealing structure according to claim 5, characterized in that: The width of the oil leakage groove (1e) in the first shaft shoulder is greater than the width of the first oil throwing groove (1b); And / or, the width of the oil leakage groove (1f) in the second shaft shoulder is greater than the width of the second oil throwing groove (1c).

7. The rotary shaft sealing structure according to claim 1, characterized in that: It also includes a joint (5) and an elbow (6); The bent pipe (6) is connected to the first oil drain hole (2b) through the joint (5).

8. The rotary shaft sealing structure according to any one of claims 1 to 7, characterized in that: The oil-slinging groove consists of an inner side surface and an outer side surface; the inner side surface is perpendicular to the axis of the rotating shaft (1), and the angle between the outer side surface and the inner side surface is 45° to 60°.

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