A double-bearing bidirectional combined sealing device

Abstract

The present invention provides a dual-bearing bidirectional combined sealing device. When the shaft rotates, the shaft sleeve and the shaft form an axial static seal through the O-type rubber sealing ring; a radial dynamic seal is formed between the sealing cover, the J-type skeleton oil seal and the shaft sleeve; the sealing cover, the compressed J-type skeleton oil seal and the oil seal fixing tube form an end face static seal, and a static seal is formed with the end face of the bearing seat through the oil sealing pad. The advantage of the present invention is that it solves the problems in the existing dual-bearing sealing technology field that the service life of the bearing is reduced and the bearing is heated and burned due to poor bearing sealing, and realizes a bidirectional combined seal in which the dynamic seal and the static seal complement each other, which can prevent the lubricant from leaking out and prevent the external medium from entering the bearing cavity, ensuring that the bearing achieves a better sealing effect. The present invention can achieve bidirectional sealing both inside and outside, with reliable sealing and long service life; processing, manufacturing, installation, disassembly, maintenance, etc. are easy, convenient and fast.

Description

Technical Field

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

[0002] Bearings are an important component in modern mechanical equipment. Their 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 bearings in good lubrication conditions and normal working environment, give full play to the working performance of the bearings and extend their service life, the bearings must have good sealing to prevent the leakage of lubricants and the intrusion of dust, water vapor or other dirt, so as to ensure the normal operation of the mechanical equipment. Summary of the invention

[0003] In the process of mechanical structure design, double bearings are often used back-to-back. The reliability of lubrication and sealing is one of the important factors affecting the service life of bearings. Therefore, the double bearing seal design needs to adopt a combination of sealing devices with various sealing structures according to the requirements of the working conditions of the bearings and the working environment for the degree of sealing, so as to achieve a better sealing effect.

[0004] The purpose of the present invention is to provide a dual-bearing bidirectional combined sealing device in the field of bearing sealing technology. The present invention solves the problem of reduced bearing service life and bearing heating and burning due to poor bearing sealing in the existing dual-bearing sealing technology. A dual-bearing bidirectional combined sealing device is used 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 double-bearing bidirectional combined sealing device, comprising a shaft, a bearing A, a bearing B, a bearing seat and a shaft sleeve, a sealing cover A, a J-shaped skeleton oil seal A, an oil seal spacer A, an oil seal fixing cylinder A, a J-shaped skeleton oil seal B, an O-shaped rubber sealing ring, an oil seal fixing cylinder B, a J-shaped skeleton oil seal C, an oil seal spacer B, a J-shaped skeleton oil seal D, and a sealing cover B; wherein:

[0007] Two bearings A and B are placed back to back in the bearing seat. The sleeve is fixed on the shaft. An O-type rubber seal is installed between the sleeve and the shaft. The sleeve supports the inner ring end face of bearing A and rotates with the shaft.

[0008] The oil seal fixing cylinder A is installed in the bearing seat and supports the outer ring end face of the bearing A. The J-type skeleton oil seal A and the J-type skeleton oil seal B are installed therein and are used back to back. An oil seal spacer ring A is installed between the two skeleton oil seals. The J-type skeleton oil seal A, the oil seal spacer ring A, the oil seal fixing cylinder A and the J-type skeleton oil seal B are all in a static fixed state relative to the shaft.

[0009] The oil seal fixing cylinder B is installed in the bearing seat and supports the outer ring end face of the bearing B. It is equipped with J-type skeleton oil seal C and J-type skeleton oil seal D which are used back to back. An oil seal spacer ring B is installed between the two skeleton oil seals. The J-type skeleton oil seal C, the oil seal spacer ring B and the J-type skeleton oil seal D are all in a static fixed state relative to the shaft.

[0010] The sealing cover A is fixedly installed on the end face of one side of the bearing seat, pressing the J-type skeleton oil seal A, the oil seal fixing tube A, and the J-type skeleton oil seal B; the sealing cover B is fixedly installed on the end face of the other side of the bearing seat, pressing the J-type skeleton oil seal C, the oil seal fixing tube B, and the J-type skeleton oil seal D.

[0011] The above scheme further comprises:

[0012] The bearing seat is provided with a straight-through pressure injection oil cup A, a straight-through pressure injection oil cup B, a straight-through pressure injection oil cup C, and a straight-through pressure injection oil cup D. The J-type skeleton oil seal A, the shaft sleeve, the J-type skeleton oil seal B, and the oil seal spacer A form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A through the oil seal spacer A, the oil seal fixing cylinder A, and the radial through hole on the bearing seat. The shaft sleeve, the oil seal fixing cylinder A, and the inner bearing A form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A through the oil seal fixing cylinder A. The radial through holes on the fixed cylinder A and the bearing seat are connected to the straight-through pressure-injection oil cup B; the oil seal fixed cylinder B, the shaft, and the inner bearing B are provided with an oil injection cavity, which is connected to the straight-through pressure-injection oil cup C through the oil seal fixed cylinder B and the radial through holes on the bearing seat; the J-type skeleton oil seal C, the oil seal spacer ring B, the J-type skeleton oil seal D, and the shaft are provided with an oil injection cavity, which is connected to the straight-through pressure-injection oil cup D through the oil seal spacer ring B, the oil seal fixed cylinder B, and the radial through holes on the bearing seat.

[0013] An oil sealing gasket A is also provided between the sealing cover A and the bearing seat, and an oil sealing gasket B is also provided between the sealing cover B and the bearing seat.

[0014] It also includes connecting bolts A and connecting bolts B. The sealing cover A equipped with the oil sealing gasket A is fixedly installed on the end face of one side of the bearing seat through the connecting bolts A; the sealing cover B equipped with the oil sealing gasket B is fixedly installed on the end face of the other side of the bearing seat through the connecting bolts B.

[0015] When the shaft rotates, the sleeve and the shaft form an axial static seal through the O-ring rubber seal; a radial dynamic seal is formed between the sealing cover, the J-type skeleton oil seal and the sleeve; the sealing cover and the compressed J-type skeleton oil seal and the oil seal fixing cylinder form an end face static seal, and a static seal is formed with the end face of the bearing seat through the oil sealing pad.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. It is composed of dynamic and static sealing structures, with reliable sealing and long service life;

[0018] 2. Processing, manufacturing, installation, disassembly, maintenance, etc. are easy, convenient and fast;

[0019] 3. Bidirectional sealing can be achieved both inside and outside, which can prevent lubricant from leaking out and external media from entering the bearing and sealing cavity, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of a dual-bearing bidirectional combined sealing device of the present invention.

[0021] Reference numerals:

[0022] 1-shaft, 2-sleeve, 3-sealing cover A, 4-connecting bolt A, 5-J-type skeleton oil seal A, 6-oil seal spacer A, 7-straight-through pressure injection oil cup A, 8-oil seal fixing tube A, 9-J-type skeleton oil seal B, 10-straight-through pressure injection oil cup B, 11-O-type rubber sealing ring, 12-bearing A, 13-bearing B, 14-straight-through pressure injection oil cup C, 15-oil seal fixing tube B, 16-J-type skeleton oil seal C, 17-straight-through pressure injection oil cup D, 18-oil seal spacer B, 19-bearing seat, 20-J-type skeleton oil seal D, 21-connecting bolt B, 22-sealing cover B, 23-oil seal pad B, 24-oil seal pad A. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1:

[0025] See also Figure 1 A double-bearing bidirectional combined sealing device comprises a shaft 1, a bearing A12, a bearing B13, a bearing seat 19 and a shaft sleeve 2, a sealing cover A3, a J-type skeleton oil seal A5, an oil seal spacer A6, an oil seal fixing cylinder A8, a J-type skeleton oil seal B9, an O-type rubber sealing ring 11, an oil seal fixing cylinder B15, a J-type skeleton oil seal C16, an oil seal spacer B18, a J-type skeleton oil seal D20, and a sealing cover B22; wherein:

[0026] Two bearings A12 and B13 are placed back to back in the bearing seat 19. The sleeve 2 is fixedly mounted on the shaft 1. An O-type rubber seal ring 11 is installed between the sleeve 2 and the shaft 1. The sleeve 2 supports the inner ring end face of the bearing A12 and rotates with the shaft 1.

[0027] The oil seal fixing cylinder A8 is installed in the bearing seat 19 and supports the outer ring end face of the bearing A12. The J-type skeleton oil seal A5 and the J-type skeleton oil seal B9 are installed therein and are used back to back. The oil seal spacer A6 is installed between the two skeleton oil seals. The J-type skeleton oil seal A5, the oil seal spacer A6, the oil seal fixing cylinder A8 and the J-type skeleton oil seal B9 are all in a static fixed state relative to the shaft 1.

[0028] The oil seal fixing cylinder B15 is installed in the bearing seat 19 and supports the outer ring end face of the bearing B13. The J-type skeleton oil seal C16 and the J-type skeleton oil seal D20 are installed therein and are used back to back. An oil seal spacer ring B18 is installed between the two skeleton oil seals. The J-type skeleton oil seal C16, the oil seal spacer ring B18 and the J-type skeleton oil seal D20 are all in a static fixed state relative to the shaft 1.

[0029] The sealing cover A3 is fixedly installed on the end surface of one side of the bearing seat 19, pressing the J-type skeleton oil seal A5, the oil seal fixing tube A8, and the J-type skeleton oil seal B9; the sealing cover B22 is fixedly installed on the end surface of the other side of the bearing seat 19, pressing the J-type skeleton oil seal C20, the oil seal fixing tube B15, and the J-type skeleton oil seal D16.

[0030] The above embodiment further includes:

[0031] The bearing seat 19 is provided with a straight-through pressure injection oil cup A7, a straight-through pressure injection oil cup B10, a straight-through pressure injection oil cup C14, and a straight-through pressure injection oil cup D17. The J-type skeleton oil seal A5, the shaft sleeve 2, the J-type skeleton oil seal B9, and the oil seal spacer A6 form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A7 through the oil seal spacer A6, the oil seal fixing cylinder A8, and the radial through hole on the bearing seat 19. The shaft sleeve 2, the oil seal fixing cylinder A8, and the inner bearing A12 form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A7 through the oil seal fixing cylinder A8 and the radial through hole on the bearing seat 19. The radial through hole on the bearing seat 19 is connected to the straight-through pressure-injection oil cup B10; the oil seal fixing tube B15, the shaft 1, and the inner bearing B13 form an oil injection cavity, which is connected to the straight-through pressure-injection oil cup C14 through the oil seal fixing tube B15 and the radial through hole on the bearing seat 19; the J-type skeleton oil seal C16, the oil seal spacer ring B18, the J-type skeleton oil seal D20, and the shaft 1 form an oil injection cavity, which is connected to the straight-through pressure-injection oil cup D17 through the oil seal spacer ring B18, the oil seal fixing tube B15, and the radial through hole on the bearing seat 19.

[0032] An oil sealing gasket A24 is also provided between the sealing cover A3 and the bearing seat 19, and an oil sealing gasket B23 is also provided between the sealing cover B22 and the bearing seat 19.

[0033] It also includes connecting bolts A4 and connecting bolts B21. The sealing cover A3 equipped with an oil sealing gasket A24 is fixedly installed on one end surface of the bearing seat 19 through the connecting bolts A4; the sealing cover B22 equipped with an oil sealing gasket B23 is fixedly installed on the other end surface of the bearing seat 19 through the connecting bolts B21.

[0034] When the shaft rotates, the sleeve and the shaft form an axial static seal through the O-ring rubber seal; a radial dynamic seal is formed between the sealing cover, the J-type skeleton oil seal and the sleeve; the sealing cover and the compressed J-type skeleton oil seal and the oil seal fixing cylinder form an end face static seal, and a static seal is formed with the end face of the bearing seat through the oil sealing pad.

[0035] Embodiment 2:

[0036] A double-bearing bidirectional combined sealing device comprises a shaft 1, a shaft sleeve 2, a sealing cover A3, a connecting bolt A4, a J-type skeleton oil seal A5, an oil seal spacer A6, a straight-through pressure injection oil cup A7, an oil seal fixing cylinder A8, a J-type skeleton oil seal B9, a straight-through pressure injection oil cup B10, an O-type rubber sealing ring 11, a bearing A12, a bearing B13, a straight-through pressure injection oil cup C14, an oil seal fixing cylinder B15, a J-type skeleton oil seal C16, a straight-through pressure injection oil cup D17, an oil seal spacer B18, a bearing seat 19, a J-type skeleton oil seal D20, a connecting bolt B21, a sealing cover B22, an oil sealing pad B23, and an oil sealing pad A24.

[0037] Two bearings A12 and B13 used back to back are placed in the bearing seat 19, and the sleeve 2 is fixedly mounted on the shaft 1. An O-type rubber seal 11 is installed between the sleeve 2 and the shaft 1. The sleeve 2 supports the inner ring end face of the bearing A12 and rotates with the shaft 1, which is in a moving state. The oil seal fixing cylinder A8 is installed in the bearing seat 19 and supports the outer ring end face of the bearing A12. It contains the J-type skeleton oil seal A5 and J-type skeleton oil seal B9 used back to back; an oil seal spacer A6 is installed between the two skeleton oil seals. The J-type skeleton oil seal A5, the oil seal spacer A6, the oil seal fixing cylinder A8, and the J-type skeleton oil seal B9 are all in a static fixed state relative to the shaft 1.

[0038] The oil seal fixing cylinder B15 is installed in the bearing seat 19 and supports the outer ring end face of the bearing B13. It contains J-type skeleton oil seal C16 and J-type skeleton oil seal D20 which are used back to back. An oil seal spacer ring B18 is installed between the two skeleton oil seals. The J-type skeleton oil seal C16, the oil seal spacer ring B18 and the J-type skeleton oil seal D20 are all in a static fixed state.

[0039] The sealing cover A3 is fixedly installed on the end surface of one side of the bearing seat 19, pressing the J-type skeleton oil seal A5, the oil seal fixing tube A8, and the J-type skeleton oil seal B9, all of which are in a static fixed state; the sealing cover B22 is fixedly installed on the end surface of the other side of the bearing seat 19, pressing the J-type skeleton oil seal C16, the oil seal fixing tube B18, and the J-type skeleton oil seal D20, all of which are in a static fixed state.

[0040] The bearing seat 19 is provided with a straight-through pressure injection oil cup A7, a straight-through pressure injection oil cup B10, a straight-through pressure injection oil cup C14, and a straight-through pressure injection oil cup D17. The J-type skeleton oil seal A5, the shaft sleeve 2, the J-type skeleton oil seal B9, and the oil seal spacer A6 form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A7 through the oil seal spacer A6, the oil seal fixing cylinder A8, and the radial through hole on the bearing seat 19. The shaft sleeve 2, the oil seal fixing cylinder A8, and the inner bearing A12 form an oil injection cavity, which is connected to the straight-through pressure injection oil cup A7 through the oil seal fixing cylinder A8 and the radial through hole on the bearing seat 19. The radial through hole on the bearing seat 19 is connected to the straight-through pressure-injection oil cup B10; the oil seal fixing tube B15, the shaft 1, and the inner bearing B13 form an oil injection cavity, which is connected to the straight-through pressure-injection oil cup C14 through the oil seal fixing tube B15 and the radial through hole on the bearing seat 19; the J-type skeleton oil seal C16, the oil seal spacer ring 18, the J-type skeleton oil seal D20, and the shaft 1 form an oil injection cavity, which is connected to the straight-through pressure-injection oil cup D17 through the oil seal spacer ring B18, the oil seal fixing tube B15, and the radial through hole on the bearing seat 19.

[0041] An oil seal gasket B23 is also provided between the sealing cover B22 and the bearing seat 19. The sealing cover B22 equipped with the oil seal gasket B23 is fixedly mounted on the other end surface of the bearing seat 19 through the connecting bolts B21. An oil seal gasket A24 is also provided between the sealing cover A3 and the bearing seat 19.

[0042] The sealing cover A3 equipped with the oil sealing gasket A24 is fixedly installed on one end face of the bearing seat 19 through the connecting bolt A4, pressing the J-type skeleton oil seal A5, the oil seal fixing tube A8, and the J-type skeleton oil seal B9, all of which are in a static fixed state, playing the role of static sealing of the end face and compensating for processing, manufacturing, and installation clearance errors.

[0043] The sealing cover B22 equipped with the oil sealing gasket B23 is fixedly installed on the other side end face of the bearing seat 19 through the connecting bolts B21, pressing the J-type skeleton oil seal C16, the oil seal fixing tube B18, and the J-type skeleton oil seal D20, all of which are in a static fixed state, playing the role of static sealing of the end face and compensating for processing, manufacturing, and installation clearance errors.

[0044] Its working principle is:

[0045] Before bearings A12 and B13 rotate, lubricant is directly injected from straight-through pressure-injection oil cups B10 and C14 into the cavities on both sides of bearings A12 and B13 in bearing seat 19 to lubricate the bearings and maintain a pressure slightly higher than the external atmospheric pressure in the cavities; lubricant is directly injected from straight-through pressure-injection oil cups A7 through the oil holes on oil seal fixing tube A8 and oil seal spacer A6 into the cavity between J-type skeleton oil seals A5 and B9 used back to back; lubricant is directly injected from straight-through pressure-injection oil cups D17 through the oil holes on oil seal fixing tube B15 and oil seal spacer B18 into the cavity between J-type skeleton oil seals C16 and D20 used back to back.

[0046] As the shaft 1 rotates, the sleeve 2 equipped with the O-type rubber sealing ring 11, the bearing A12, and the bearing A13 rotate together, but the sealing cover A3, the J-type skeleton oil seal A5, the oil seal spacer A6, the oil seal fixing tube A8, the J-type skeleton oil seal B9, the oil seal fixing tube B15, the J-type skeleton oil seal C16, the oil seal spacer B18, the J-type skeleton oil seal D20, and the sealing cover B22 are all in a static fixed state, and the sleeve 2 and the shaft 1 form an axial static seal through the O-type rubber sealing ring 11 to seal the installation fit clearance between the sleeve 2 and the shaft 1; a radial dynamic seal is formed between the sealing cover A3, the J-type skeleton oil seal A5, the J-type skeleton oil seal B9 and the sleeve 2; a radial dynamic seal is formed between the sealing cover B22, the J-type skeleton oil seal C16, the J-type skeleton oil seal D20 and the shaft 1.

[0047] The sealing cover A3 equipped with the sealing oil pad A24 is fixedly installed on one end face of the bearing seat 19 through the connecting bolts A4, and the J-type skeleton oil seal A5, the oil seal fixing cylinder A8, and the J-type skeleton oil seal B9 are pressed to form an end face static seal, and the end face static seal is formed with the bearing seat 19 through the sealing oil pad A24;

[0048] The sealing cover B22 equipped with the oil sealing gasket B23 is fixedly installed on the other side end face of the bearing seat 19 through the connecting bolts B21, pressing the J-type skeleton oil seal C16, the oil seal fixing tube B18, and the J-type skeleton oil seal D20 to form an end face static seal, and forms an end face static seal with the bearing seat 19 through the oil sealing gasket B23.

[0049] The combined seal of various sealing structures adopted in the present invention can ensure that the bearing achieves a better sealing effect.

Claims

1. A dual-bearing bidirectional combined sealing device, comprising a shaft (1), a bearing A (12), a bearing B (13), and a bearing seat (19), characterized in that: It also includes a shaft sleeve (2), a sealing cover A (3), a J-shaped skeleton oil seal A (5), an oil seal spacer A (6), an oil seal fixing tube A (8), a J-shaped skeleton oil seal B (9), an O-shaped rubber sealing ring (11), an oil seal fixing tube B (15), a J-shaped skeleton oil seal C (16), an oil seal spacer B (18), a J-shaped skeleton oil seal D (20), and a sealing cover B (22); wherein: two bearings A (12) and a bearing B (13) used back to back are placed in a bearing seat (19); the shaft sleeve (2) is fixedly sleeved on the shaft (1); an O-shaped rubber sealing ring (11) is installed between the shaft sleeve (2) and the shaft (1); the shaft sleeve (2) supports the inner ring end face of the bearing A (12) and rotates with the shaft (1); the oil seal fixing tube The fixed cylinder A (8) is installed in the bearing seat (19) and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing A (12). The fixed cylinder A (8) is installed in the bearing seat and supports the outer ring end face of the bearing B (13). The fixed cylinder C (16 ... , oil seal spacer ring B (18), and J-type skeleton oil seal D (20) are all in a stationary fixed state relative to the shaft (1); a sealing cover A (3) is fixedly mounted on one end surface of the bearing seat (19) to press the J-type skeleton oil seal A (5), the oil seal fixing cylinder A (8), and the J-type skeleton oil seal B (9); a sealing cover B (22) is fixedly mounted on the other end surface of the bearing seat (19) to press the J-type skeleton oil seal C (16), the oil seal fixing cylinder B (15), and the J-type skeleton oil seal D (20); a straight-through pressure injection oil cup A (7), a straight-through pressure injection oil cup B (10), a straight-through pressure injection oil cup C (14), and a straight-through pressure injection oil cup D (17) are mounted outside the bearing seat (19); the J-type skeleton oil seal A (5), the shaft sleeve (2 ), the J-shaped skeleton oil seal B (9) and the oil seal spacer A (6) form an oil injection cavity, which is connected to the straight-through pressure injection cup A (7) through the radial through hole on the oil seal spacer A (6), the oil seal fixing cylinder A (8) and the bearing seat (19); the shaft sleeve (2), the oil seal fixing cylinder A (8) and the inner bearing A (12) form an oil injection cavity, which is connected to the straight-through pressure injection cup B (10) through the radial through hole on the oil seal fixing cylinder A (8) and the bearing seat (19); the oil seal fixing cylinder B (15), the shaft (1) and the inner bearing B (13) form an oil injection cavity, which is connected to the straight-through pressure injection cup C (14) through the radial through hole on the oil seal fixing cylinder B (15) and the bearing seat (19);An oil injection cavity is formed between the J-type skeleton oil seal C (16), the oil seal spacer ring B (18), the J-type skeleton oil seal D (20) and the shaft (1). The oil injection cavity is connected to the straight-through pressure oil injection cup D (17) through the radial through hole on the oil seal spacer ring B (18), the oil seal fixing cylinder B (15) and the bearing seat (19). ; 2. A dual-bearing bidirectional combined sealing device according to claim 1, characterized in that: An oil sealing gasket A (24) is also provided between the sealing cover A (3) and the bearing seat (19), and an oil sealing gasket B (23) is also provided between the sealing cover B (22) and the bearing seat (19).

3. A dual-bearing bidirectional combined sealing device according to claim 2, characterized in that: It also includes a connecting bolt A (4) and a connecting bolt B (21). A sealing cover A (3) equipped with an oil sealing gasket A (24) is fixedly mounted on one end surface of the bearing seat (19) through the connecting bolt A (4); and a sealing cover B (22) equipped with an oil sealing gasket B (23) is fixedly mounted on the other end surface of the bearing seat (19) through the connecting bolt B (21).

Images