A single bearing bidirectional combined sealing device

Abstract

The present invention provides a single-bearing bidirectional combined sealing device, including an outer sleeve, a sealing cover A, a sealing retaining ring, a straight-through pressure-injected oil cup A, an inner sleeve, a bearing, a bearing seat, a straight-through pressure-injected oil cup B, a sealing cover B, and a radial labyrinth sealing cover. The combined seal using a variety of sealing structures is reliable and has a long service life. The synchronous high-speed rotation of the internal sealing retaining ring and the radial labyrinth sealing cover can not only play the role of dynamic sealing but also have cooling and heat dissipation functions, thereby extending the service life of the bearing and the lubricant. The bidirectional combined seal that realizes the mechanical dynamic seal (axial, end face) and the static seal complement each other can not only prevent the lubricant from leaking out, but also prevent the external medium from entering the bearing cavity, ensuring that the bearing achieves a better sealing effect, and solving the problem of reduced bearing service life and bearing heating and burning due to poor bearing sealing in the existing single bearing sealing technology field.

Description

Technical Field

[0001] The invention relates to the technical field of bearing sealing, and in particular to a single-bearing bidirectional combined sealing device. Background Art

[0002] Bearings are an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body and reduce the mechanical load friction coefficient of the equipment during the transmission process. In order to keep the bearing in good lubrication conditions and normal working environment, give full play to the working performance of the bearing and extend the service life, the bearing must have a good seal to prevent the leakage of lubricants and the invasion of dust, water vapor or other dirt to ensure the normal operation of the mechanical equipment. If the bearing seal is poor, the working condition of the bearing will deteriorate significantly and the service life of the bearing will be significantly reduced; if there is oil leakage, the normal lubrication of the bearing will be destroyed, and the bearing will burn out due to heat. In addition, oil leakage not only causes waste, but also pollutes mechanical equipment and processed products.

[0003] Therefore, the bearing seal design needs to adopt a combination of sealing devices with various sealing structures according to the requirements of the bearing working conditions and the working environment for the degree of sealing, so as to achieve a better sealing effect. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the existing bearing sealing technology field, such as reduced bearing service life and bearing heating and burning due to poor bearing sealing, and to provide a single-bearing bidirectional combined sealing device to ensure reliable bearing sealing and long service life.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A single-bearing bidirectional combined sealing device, which mainly includes a shaft, an outer sleeve, an O-ring A, a sealing cover A, an oil seal pad A, connecting bolts, a sealing retaining ring, a straight-through pressure-injected oil cup A, an inner sleeve, a bearing, a bearing seat, a straight-through pressure-injected oil cup B, a sealing cover B, an oil seal pad B, a radial labyrinth sealing cover, an O-ring B, and a set screw, wherein the outer sleeve equipped with an O-ring A, the sealing retaining ring, the inner sleeve, the bearing, and the radial labyrinth sealing cover equipped with an O-ring B rotate at high speed with the shaft, and the sealing cover A and the sealing cover B are fixed to the two end faces of the bearing seat by connecting bolts and are in a stationary state.

[0007] During the rotation of the shaft, an axial mechanical dynamic seal is formed between the outer sleeve and the sealing cover A, and an axial mechanical dynamic seal is also formed between the shaft and the sealing cover B; a mechanical end face dynamic seal is formed between the shaft and the radial labyrinth sealing cover and the sealing cover B;

[0008] An axial static seal is formed between the outer sleeve and the shaft through an O-ring A, an axial static seal is formed between the radial labyrinth seal cover and the shaft through an O-ring B, and oil sealing pads A and B are static seals on the end faces of the bearing seat.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The dynamic seals are all mechanical, and the static seals are O-type rubber rings or oil seal pads, which complement each other. This combination of multiple sealing structures is reliable and has a long service life;

[0011] 2. The synchronous high-speed rotation of the internal sealing ring and radial labyrinth sealing cover can not only play the role of dynamic sealing but also have the function of cooling and heat dissipation, thus extending the service life of the bearing and lubricant;

[0012] 3. Both the inside and outside can achieve bidirectional sealing, which can prevent the lubricant from leaking out and prevent the external medium from entering the bearing cavity, and has a wide range of applications;

[0013] 4. Processing, manufacturing, installation, disassembly, maintenance, etc. are easy, convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of a single-bearing bidirectional combined sealing device of the present invention.

[0015] Figure markings: 1-shaft, 2-outer sleeve, 3-O-ring A, 4-sealing cover A, 5-oil sealing gasket A, 6-connecting bolts, 7-sealing ring, 8-straight-through pressure-injection oil cup A, 9-inner sleeve, 10-bearing, 11-bearing seat, 12-straight-through pressure-injection oil cup B, 13-sealing cover B, 14-oil sealing gasket B, 15-radial labyrinth sealing cover, 16-O-ring B, 17-fastening screw, connecting bolt 18. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] See attached Figure 1 A single-bearing bidirectional combined sealing device includes a shaft 1, an outer sleeve 2, an O-ring A3, a sealing cover A4, an oil sealing gasket A5, a connecting bolt 6, a sealing retaining ring 7, a straight-through pressure injection oil cup A8, an inner sleeve 9, a bearing 10, a bearing seat 11, a straight-through pressure injection oil cup B12, a sealing cover B13, an oil sealing gasket B14, a radial labyrinth sealing cover 15, an O-ring B16, a set screw 17, and a connecting bolt 18.

[0018] The bearing 10 is fixedly installed on the shaft 1 and placed in the bearing seat 11. The sealing cover A4 is fixedly installed on one end face of the bearing seat 11 by the connecting bolts 6, axially pressing the outer ring end face of the bearing 10. The sealing cover B13 is fixedly installed on the other end face of the bearing seat 11 by the connecting bolts 18.

[0019] The outer sleeve 2, the sealing retaining ring 7, and the inner sleeve 9 are fixedly installed on the shaft 1 in sequence, rotate with the shaft 1, and form a dynamic seal with the sealing cover A4. The inner sleeve 9 axially supports the inner ring end face of the bearing 10; the radial labyrinth sealing cover 15 equipped with an O-ring B16 is installed on the shaft 1 by means of a set screw 17, rotates with the shaft 1, and forms a dynamic seal with the sealing cover B13.

[0020] The sealing ring 7, the inner sleeve 9, the bearing 10 and the sealing cover A4 form an oil filling cavity on one side, and the bearing seat 11 and the sealing cover A4 are respectively provided with radial through holes corresponding to the positions of the oil filling cavities, and a straight-through pressure-filling oil cup A8 is installed on the bearing seat 11 corresponding to the through holes; the sealing cover B13, the shaft 1, the bearing 10 and the bearing seat 11 form an oil filling cavity on the other side, and the bearing seat 11 is provided with radial through holes corresponding to the positions of the oil filling cavities, and a straight-through pressure-filling oil cup B12 is installed on the bearing seat 11 corresponding to the through holes.

[0021] The inner wall of the sealing cover A4 is provided with three annular sealing grooves on the side in contact with the outer sleeve 2; the inner wall of the sealing cover B13 is provided with three annular sealing grooves on the side in contact with the shaft 1, and the annular sealing grooves play a throttling role on the lubricating oil. There is also an O-ring A3 between the outer sleeve 2 and the shaft 1, and an O-ring B16 between the radial labyrinth sealing cover 15 and the shaft 1. The sealing cover A4 equipped with the oil sealing gasket A5 and the sealing cover B13 equipped with the oil sealing gasket B14 are fixedly installed on the two end faces of the bearing seat 11 by connecting bolts 6 and connecting bolts 18, respectively, and are both in a static fixed state relative to the shaft 1.

[0022] Its working principle is:

[0023] Before the bearing 10 rotates, lubricant is directly injected from the straight-through pressure injection cup A8 and the straight-through pressure injection cup B12 into the cavities on both sides of the bearing 10 in the bearing seat 11 to lubricate the bearing 10 and maintain a pressure in the cavity slightly higher than the external atmospheric pressure.

[0024] When the shaft 1 rotates and drives the bearing 10 to rotate, the outer sleeve 2 equipped with the O-ring A3, the sealing ring 7, the inner sleeve 9, the bearing 10 and the radial labyrinth seal cover 15 equipped with the O-ring B16 rotate at high speed along with the shaft 1. An axial mechanical dynamic seal is formed between the high-speed rotating outer sleeve 2 and the stationary seal cover A4, and an axial mechanical dynamic seal is also formed between the high-speed rotating shaft 1 and the stationary seal cover B13. A mechanical end face dynamic seal is formed between the radial labyrinth seal cover 15 rotating at high speed along with the shaft 1 and the outer side of the seal cover B13.

[0025] An O-ring A3 is installed in the outer sleeve 2 to form an axial static seal between the outer sleeve 2 and the shaft 1, thereby making up for the installation clearance between the outer sleeve 2 and the shaft 1; an O-ring B16 is installed in the radial labyrinth seal cover 15 to form an axial static seal between the radial labyrinth seal cover 15 and the shaft 1, thereby making up for the installation clearance between the radial labyrinth seal cover 15 and the shaft 1.

[0026] The oil sealing pad A5 and the oil sealing pad B14 are static seals for the end face of the bearing seat 11; the sealing ring 7 installed on the shaft 1 rotates at high speed with the shaft 1 and also plays a role in cooling the temperature of the bearing 10 and the bearing seat 11 cavity; the radial labyrinth sealing cover 15 that rotates at high speed with the shaft 1 also plays a role in cooling and dissipating heat; the sealing cover A4 equipped with the oil sealing pad A5 also plays a role in compensating and supporting the outer ring of the bearing 10.

[0027] The combined seal of various sealing structures adopted in the present invention can ensure that the bearing achieves a better sealing effect.

[0028] Its advantages are: the dynamic seals are all mechanical, and the static seals are O-rings or oil seals, which complement each other. This combination of multiple sealing structures is reliable and has a long service life; the synchronous high-speed rotation of the internal sealing ring and the radial labyrinth sealing cover can not only play the role of dynamic sealing but also have a cooling and heat dissipation function, thereby extending the service life of the bearing and lubricant; bidirectional sealing can be achieved both inside and outside, which can prevent the lubricant from leaking out and the external medium from entering the bearing cavity, and has a wide range of applications; processing, manufacturing, installation, disassembly, maintenance, etc. are easy, convenient and fast.

Claims

1. A single-bearing bidirectional combined sealing device, comprising a bearing (10), a shaft (1) and a bearing seat (11), characterized in that: It also includes an outer sleeve (2), a sealing cover A (4), a sealing retaining ring (7), an inner sleeve (9), a sealing cover B (13), and a radial labyrinth sealing cover (15); wherein: the sealing cover A (4) is fixedly mounted on one end face of the bearing seat (11) and axially presses the outer ring end face of the bearing (10); the sealing cover B (13) is fixedly mounted on the other end face of the bearing seat (11); the outer sleeve (2), the sealing retaining ring (7), and the inner sleeve (9) are fixedly mounted on the shaft (1) in sequence and rotate with the shaft (1) to form dynamic seals with the sealing cover A (4); the inner sleeve (9) axially supports the inner ring end face of the bearing (10); the sealing retaining ring (7), the inner sleeve (9), the bearing (10), and the sealing cover A (4) form an oil injection cavity on one side; the bearing seat (11) and the sealing cover A (4) are respectively provided with radial through holes corresponding to the positions of the oil injection cavities, and a straight-through pressure oil injection cup A (8) is mounted on the bearing seat (11) corresponding to the through holes; The radial labyrinth seal cover (15) is fixedly mounted on the shaft (1), rotates with the shaft (1), and forms a dynamic seal with the seal cover B (13); the seal cover B (13), the shaft (1), the bearing (10) and the bearing seat (11) form an oil injection cavity on the other side, the bearing seat (11) is provided with a radial through hole at a position corresponding to the oil injection cavity, and a straight-through pressure injection cup B (12) is installed on the bearing seat (11) corresponding to the through hole; the seal cover A (4) is provided with three throttling ring type sealing grooves on the side contacting the outer sleeve (2); the seal cover B (13) is provided with three throttling ring type sealing grooves on the side contacting the shaft (1); an O-ring A (3) is also provided between the outer sleeve (2) and the shaft (1), and an O-ring B (16) is also provided between the radial labyrinth seal cover (15) and the shaft (1).

2. A single bearing bidirectional combined sealing device according to claim 1, characterized in that: The radial labyrinth sealing cover (15) is mounted on the shaft (1) via set screws (17).

3. A single bearing bidirectional combined sealing device according to claim 2, characterized in that: The sealing cover A (4) is mounted on one end surface of the bearing seat (11) via connecting bolts (6); the sealing cover B (13) is mounted on the other end surface of the bearing seat (11) via connecting bolts (6).

4. A single bearing bidirectional combined sealing device according to claim 3, characterized in that: An oil sealing gasket A (5) is installed between the bearing seat (11) and the sealing cover A (4), and an oil sealing gasket B (14) is installed between the bearing seat (11) and the sealing cover B (13).

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