Non-contact sealing structure of an integrated bearing cover for a mechanical transmission rotary device

Abstract

The present invention discloses a non-contact sealing structure of an integral bearing cover for a mechanical transmission rotary device. The outer shell of the bearing cover is installed on the box body, the split bearing cover is installed outside the bearing hole of the box body and inside the outer shell of the bearing cover, and the oil slinger is installed on the shaft and inside the split bearing cover; an annular groove is radially provided on the split bearing cover, the oil slinger is provided with two rows of discs along the axial direction, the inner disc of the oil slinger is located in the annular groove of the split bearing cover, and the outer disc of the oil slinger is located in the annular groove formed by the split bearing cover and the outer shell of the bearing cover. Two annular grooves and the inner and outer discs of the oil slinger respectively form sealing cavities; a first oil return hole is provided on the outer shell of the bearing cover, the split bearing cover is provided with a second oil return hole communicating with the first oil return hole, and the first oil return hole penetrates through the sealing cavity and the oil return passage of the box body. This structure is non-contact, has no wear, requires no maintenance, and has reliable sealing performance.

Description

Technical Field

[0001] The present invention belongs to the field of shaft end seals for mechanical transmissions, and particularly relates to a non-contact seal structure of an integral bearing cover for a mechanical transmission rotary device. Background Art

[0002] Mechanical transmission rotary devices are widely used in industries such as cement, construction, metallurgy, mining, and transportation machinery. At present, the lubrication of relatively moving parts inside the casing of mechanical transmission rotary devices mainly uses oil bath splash lubrication or circulating oil forced lubrication. The sealing forms at the input and output shaft parts of mechanical transmission rotary devices mainly use contact seals of sealing rings or sealing rings plus oil slingers. The sealing effect mainly depends on the manufacturing and installation accuracy of the shaft, hole, and sealing ring. During the use of the machine, the sealing ring needs to be replaced regularly due to service life issues, resulting in a certain degree of waste and economic losses caused by production stoppage for maintenance.

[0003] For occasions with long-term reliable sealing requirements, such as cement and metallurgical rolling production lines, mechanical non-contact seals are also often used. Usually, for a mechanical non-contact seal, the outer circular part of the rotating oil slinger needs to be installed in the annular sealing groove of the bearing cover housing. The inner hole size of the annular sealing groove is smaller than the outer diameter of the oil slinger. Due to the need of the installation process, the bearing cover housing needs to be made into a split structure. The two half bearing cover housings need to be connected and combined together through connecting bolts and positioning pins, and a wrench space for the connecting bolts also needs to be left, which increases the thickness dimension of the bearing cover housing. Moreover, the split surface needs to be finely machined in advance, and a sealing adhesive needs to be applied to the split surface during assembly to prevent oil leakage. This not only increases the manufacturing process cost but also increases the risk of oil leakage to the outside of the machine along the split surface. Summary of the Invention

[0004] The purpose of the present invention is to design a non-contact seal structure of an integral bearing cover for a mechanical transmission rotary device. This seal structure is installed at the outer extension shaft part of the mechanical transmission rotary device to play a sealing role. This structural form is non-contact, without wear, maintenance-free, with reliable sealing performance and ideal sealing effect.

[0005] The technical solution of the present invention is: an integrated bearing cover non-contact sealing structure for a mechanical transmission rotary device. The mechanical transmission rotary device includes a box body and a shaft, and the shaft is installed in the box body through bearings. It is characterized in that a sealing structure is installed on the shaft. The sealing structure includes a bearing cover outer shell, an oil slinger, and a split bearing cover. The bearing cover outer shell is installed on the box body, the split bearing cover is installed outside the bearing hole of the box body and is located inside the bearing cover outer shell, and the oil slinger is installed on the shaft and is located inside the split bearing cover. The split bearing cover is provided with at least one annular groove in the radial direction, and the oil slinger is provided with at least two rows of discs along the axial direction. The inner disc of the oil slinger is located in the annular groove of the split bearing cover, and the outer disc of the oil slinger is located in another annular groove formed by the combination of the split bearing cover and the bearing cover outer shell. The annular groove of the split bearing cover and another annular groove formed by the combination of the split bearing cover and the bearing cover outer shell respectively form sealing cavities with the inner disc and the outer disc of the oil slinger. A first oil return hole is provided on the bearing cover outer shell, and a second oil return hole is provided on the split bearing cover. The second oil return hole communicates with the first oil return hole. One side of the first oil return hole penetrates the sealing cavity, and the other side of the first oil return hole penetrates the oil return channel on the box body.

[0006] Furthermore, the split bearing cover is provided with a plurality of radial annular grooves along the axial direction, and the oil slinger is provided with a plurality of discs along the axial direction, and they are arranged corresponding to each other along the axial direction.

[0007] During operation, the oil slinger installed on the shaft rotates with the shaft. When the oil slinger rotates with the shaft, it drives the lubricating oil entering the sealing cavity to rotate and generate a centrifugal motion. The lubricating oil flies away from the discs of the oil slinger and converges along the sealing cavity into the oil return channel, and then flows back to the box body along the oil return channel.

[0008] The present invention has the following advantages:

[0009] 1. The oil slinger is an integral structure, the split bearing cover is a split structure, and the bearing cover outer shell is an integral structure. The split surface of the split bearing cover is located inside the bearing cover outer shell, which avoids the risk of oil leakage to the outside along the split surface during the use of the machine, and the structure is relatively simple.

[0010] 2. The rotation of the shaft is used to make the lubricating oil entering the sealing cavity generate a centrifugal motion, and the lubricating oil flows back to the box body along the sealing cavity to achieve a sealing effect.

[0011] 3. This sealing structure is a non-contact sealing, without wear, and there is no need to regularly replace vulnerable parts, so the maintenance cost is low.

[0012] 4. This sealing structure does not require precise alignment during installation, which reduces the installation process requirements.

[0013] 5. The split bearing cover is provided with a plurality of radial annular grooves along the axial direction, and the oil slinger is provided with a plurality of discs along the axial direction, and they are arranged corresponding to each other along the axial direction, achieving a higher sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the non-contact sealing structure of the present invention;

[0015] Figure 2 is Figure 1 sectional view schematic diagram.

[0016] In the figure: 1. Outer housing of bearing cover, 2. Split bearing cover, 3. Oil slinger, 4. Sealing cavity, 5. Box body, 6. Bearing, 7. Shaft, 8. Oil return passage, 9. First oil return hole, 10. Second oil return hole. DETAILED DESCRIPTION OF THE INVENTION

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0018] As Figure 1 , 2 shown, for the non-contact sealing structure of the integral bearing cover of the mechanical transmission rotary device, the mechanical transmission rotary device includes a box body 5 and a shaft 7, the shaft 7 is installed in the box body 5 through a bearing 6, and it is characterized in that: a sealing structure is installed on the shaft 7, and the sealing structure includes an outer housing of bearing cover 1, an oil slinger 3 and a split bearing cover 2; the outer housing of bearing cover 1 is installed on the box body 5, the split bearing cover 2 is installed outside the bearing hole of the box body 5 and is located inside the outer housing of bearing cover 1, the oil slinger 3 is installed on the shaft 7 and is located inside the split bearing cover 2; the split bearing cover 2 is provided with at least one annular groove in the radial direction, the oil slinger 3 is provided with at least two rows of discs along the axial direction, the inner disc of the oil slinger 3 is located in the annular groove of the split bearing cover 2, and the outer disc of the oil slinger 3 is located in another annular groove formed by the combination of the split bearing cover 2 and the outer housing of bearing cover 1; the annular groove of the split bearing cover 2 and another annular groove formed by the combination of the split bearing cover 2 and the outer housing of bearing cover 1 respectively form a sealing cavity 4 with the inner disc and the outer disc of the oil slinger 3; a first oil return hole 9 is provided on the outer housing of bearing cover 1, a second oil return hole 10 is provided on the split bearing cover 2, the second oil return hole 10 communicates with the first oil return hole 9, one side of the first oil return hole 9 penetrates the sealing cavity 4, and the other side of the first oil return hole 9 penetrates the oil return passage 8 on the box body 5.

[0019] Furthermore, the split bearing cover 2 is provided with a plurality of radial annular grooves along the axial direction, and the oil slinger 3 is provided with a plurality of discs along the axial direction, and they are arranged corresponding to each other along the axial direction.

[0020] During operation, the shaft 7 makes a rotary motion, the oil slinger 3 on the shaft 7 rotates together with the shaft 7, the lubricating oil in the box body 5 enters the sealing cavity 4, the lubricating oil rotates together with the oil slinger 3, and flies away from the oil slinger 3 under the action of centrifugal force, converges into the oil return passage 8 through the first oil return hole 9, and finally flows back into the box body 5.

Claims

1. One-piece bearing cover non-contact sealing structure for a mechanical transmission rotary device. The mechanical transmission rotary device includes a box body (5) and a shaft (7). The shaft (7) is installed in the box body (5) through a bearing (6). A sealing structure is installed on the shaft (7). The sealing structure includes a bearing cover outer shell (1), an oil slinger (3), and a split bearing cover (2); characterized in that: The bearing cover housing (1) is installed on the box body (5), the split bearing cover (2) is installed on the outer side of the bearing hole of the box body (5) and is located inside the bearing cover housing (1), and the oil slinger (3) is installed on the shaft (7) and is located inside the split bearing cover (2); the split bearing cover (2) is provided with at least one annular groove in the radial direction, the oil slinger (3) is provided with at least two rows of discs along the axial direction, the inner disc of the oil slinger (3) is located in the annular groove of the split bearing cover (2), and the outer disc of the oil slinger (3) is located in another annular groove formed by the combination of the split bearing cover (2) and the bearing cover housing (1); the annular groove of the split bearing cover (2) and another annular groove formed by the split bearing cover (2) and the bearing cover housing (1) respectively form sealing cavities (4) with the inner disc and the outer disc of the oil slinger (3); a first oil return hole (9) is provided on the bearing cover housing (1), a second oil return hole (10) is provided on the split bearing cover (2), the second oil return hole (10) communicates with the first oil return hole (9), one side of the first oil return hole (9) penetrates the sealing cavity (4), and the other side of the first oil return hole (9) penetrates the oil return passage (8) on the box body (5).

2. The non-contact sealing structure of the integral bearing cover of the mechanical transmission rotary device according to claim 1, characterized in that: The split bearing cover (2) is provided with a plurality of radial annular grooves along the axial direction, and the oil slinger (3) is provided with a plurality of discs along the axial direction, and they are arranged corresponding to each other along the axial direction.

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