Bearing lubricating device applied to dry type screw vacuum pump

Abstract

The utility model belongs to the field of bearing lubricating devices, and particularly relates to a bearing lubricating device applied to a dry-type screw vacuum pump, which comprises a protective shell and a rotor shaft, the middle of the protective shell penetrates through a shaft body rotatably connected to the rotor shaft, the inner wall of the protective shell is fixedly connected with a bearing seat, and an oil stirring sheet is arranged on the lower portion of the bearing seat. A third bearing is arranged on the inner wall of the bearing seat shell, a second bearing is arranged on the upper portion of the third bearing, an oil distribution piece is arranged on the upper portion of the second bearing, the outer wall of the oil distribution piece is sleeved with a gap ring, and a first bearing is arranged on the upper portion of the oil distribution piece. And the collected lubricating oil flows out through the oil leakage holes in the grooves to lubricate the first bearing and the second bearing, and the lubricating oil flows to the third bearing after the first bearing and the second bearing are lubricated, so that the first bearing, the second bearing and the third bearing are completely lubricated.

Description

Technical Field

[0001] The utility model relates to the field of bearing lubrication devices, in particular to a bearing lubrication device applied to a dry screw vacuum pump. Background Art

[0002] A dry screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump casing to generate suction and exhaust effects. Twin-screw mechanical equipment, like helical gear transmission, has radial and axial forces. It is necessary to set radial bearings (cylindrical roller bearings) at both ends of the shaft (low-pressure side and high-pressure side), and place bearings (angular contact ball bearings) that withstand axial forces on the high-pressure side of the rotor to withstand axial forces. The bearings on the low-pressure side are basically cylindrical roller bearings, and the bearing configuration on the high-pressure side is to withstand radial forces through a cylindrical roller bearing. Two angular contact bearings, one positive and one negative, withstand the axial forces of normal operation, as well as the reverse axial forces during shutdown or unloading. When lubricating the cylindrical bearings in the screw vacuum pump field, forced circulating oil is used for lubrication and cooling. Because of the pressure difference, the lubricating oil flows in from the left side of the cylindrical bearing, flows through the short cylindrical bearing, and then flows through the angular contact ball bearing and flows out.

[0003] In some vacuum pump application occasions, circulating oil is not used to force differential pressure circulation, because the use of circulating oil requires an oil pump to establish a pressure difference. In some occasions, there is no condition to equip an oil pump, and the oil can only be splashed by the rotating rotor shaft to drive the oil stripper. The bearings are still arranged one close to another, and the oil splashed on them is difficult to flow to the rollers inside the bearings. In this way, the bearings cannot be completely lubricated, and in severe cases, dry friction damage to the bearings will be caused. Therefore, in view of the above problems, a bearing lubrication device applied to a dry screw vacuum pump is proposed. Utility Model Content

[0004] In order to make up for the shortcomings of the prior art and solve the problem that the bearings are still arranged closely together, the oil on them is difficult to flow to the rollers inside the bearings, so that the bearings cannot be completely lubricated, and in severe cases, dry friction damage to the bearings may occur, the utility model proposes a bearing lubrication device for a dry screw vacuum pump.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a bearing lubrication device applied to a dry screw vacuum pump, comprising a protective shell and a rotor shaft, the middle part of the protective shell passes through a shaft body rotatably connected to the rotor shaft, the inner wall of the protective shell is fixedly connected to a bearing seat, the lower part of the bearing seat is provided with an oil stripper, the middle part of the oil stripper is fixedly connected to the shaft body of the rotor shaft, the inner wall of the bearing seat housing is provided with a bearing three, the upper part of the bearing three is provided with a bearing two, the upper part of the bearing two is provided with an oil separator, the outer wall of the oil separator is sleeved with a clearance ring, and the upper part of the oil separator is provided with a bearing one;

[0006] Preferably, the oil separator comprises: a groove and an oil leakage hole, a groove is provided in the middle of the oil separator, and a plurality of oil leakage holes are provided on the inner wall of the groove;

[0007] Preferably, the thickness of the oil separator is consistent with the thickness of the gap ring;

[0008] Preferably, the bearing seat comprises: a fitting tube and a top ring, wherein the end of the bearing seat is fixedly connected to one end of the fitting tube, and the other end of the fitting tube is fixedly connected to the end of the top ring;

[0009] Preferably, the top ring further comprises a collecting hole, and the outer wall of the top ring is provided with the collecting hole;

[0010] Preferably, the bearing three is an angular contact ball bearing.

[0011] The utility model is beneficial in that:

[0012] 1. The utility model collects lubricating oil through the collecting hole, and the collected lubricating oil flows out through the oil leakage hole in the groove to lubricate the first bearing and the second bearing, and the lubricating oil after lubrication of the first bearing and the second bearing will flow to the third bearing, so that the first bearing, the second bearing and the third bearing are all fully lubricated;

[0013] 2. The utility model provides a space between the first bearing and the second bearing by setting a gap ring, so as to prevent the lubricating oil from being unable to completely lubricate the second bearing, the first bearing and the third bearing when the first bearing and the second bearing are tightly fitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the front three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the protective shell of the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the bearing seat of the utility model;

[0018] Figure 4 This is a schematic diagram of the oil separator structure of the utility model;

[0019] Figure 5 It is a structural schematic diagram of the bearing seat of the utility model.

[0020] In the figure:

[0021] 1. Protective shell; 2. Rotor shaft; 3. Bearing seat; 31. Fitting cylinder; 32. Top ring; 320. Collecting hole; 4. Oil separator; 5. Bearing 1; 6. Bearing 2; 7. Bearing 3; 8. Clearance ring; 9. Oil separator; 91. Groove; 92. Oil leakage hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The following is combined with Figure 1-5 To further explain this application in detail,

[0024] The embodiment of the present application discloses a bearing lubrication device applied to a dry screw vacuum pump, comprising a protective shell 1 and a rotor shaft 2, wherein the middle portion of the protective shell 1 penetrates through a shaft body rotatably connected to the rotor shaft 2, a bearing seat 3 is fixedly connected to the inner wall of the protective shell 1, an oil spreading piece 4 is arranged at the lower portion of the bearing seat 3, the middle portion of the oil spreading piece 4 is fixedly connected to the shaft body of the rotor shaft 2, a bearing three 7 is arranged at the inner wall of the housing of the bearing seat 3, a bearing two 6 is arranged at the upper portion of the bearing three 7, an oil separator 9 is arranged at the upper portion of the bearing two 6, a clearance ring 8 is sleeved on the outer wall of the oil separator 9, and a bearing one 5 is arranged at the upper portion of the oil separator 9;

[0025] The oil separator 9 comprises: a groove 91 and an oil leakage hole 92. The groove 91 is opened in the middle of the oil separator 9, and a plurality of oil leakage holes 92 are opened on the inner wall of the groove 91.

[0026] The thickness of the oil separator 9 is consistent with the thickness of the gap ring 8;

[0027] The bearing seat 3 comprises: a fitting tube 31 and a top ring 32, wherein the end of the bearing seat 3 is fixedly connected to one end of the fitting tube 31, and the other end of the fitting tube 31 is fixedly connected to the end of the top ring 32;

[0028] The top ring 32 further includes a collecting hole 320 , and the outer wall of the top ring 32 is provided with a collecting hole 320 ;

[0029] The bearing three 7 is an angular contact ball bearing.

[0030] Working principle: when the rotor shaft 2 is running, the rotor shaft 2 will drive the oil stripper 4 to rotate synchronously, and the oil stripper 4 is at the bottom of the protective shell 1. The lubricating oil accumulated at this position will splash part of the lubricating oil due to the rotation of the oil stripper 4, and the lubricating oil will be thrown to the upper part of the protective shell 1. The top ring 32 of the bearing seat 3 is provided with a collecting hole 320. The collecting hole 320 is similar to a funnel. The oil falling from above is collected by the collecting hole 320, and flows down from the collecting hole 320 on the top ring 32 to the oil separator 9 by its own weight. 9 has a groove 91 in the middle, and there are multiple oil leakage holes 92 inside the groove 91. The lubricating oil flowing down from the top of the collecting hole 320 passes through the oil leakage holes 92 and flows to the rolling element positions of the bearing two 6 and the bearing one 5 on both sides. Then, due to gravity, the lubricating oil will flow from the gap of the bearing two 6 to the bearing three 7, which plays a role in lubrication and cooling. The oil separator 9 and the clearance ring 8 are located between the bearing one 5 and the bearing two 6. This is because the left side of the bearing one 5 has been sealed by the protective shell 1. If it is placed between the bearing two 6 and the bearing seat 3, the lubrication effect of the bearing one 5 will be poor. When placed between bearing 1 5 and bearing 2 6, bearing 3 7 will eventually have lubricating oil flowing through it, and it also has lubrication effect. The thickness of oil separator 9 and clearance ring 8 is completely consistent, so as to ensure that the inner rings and outer rings of bearing 1 5 and bearing 2 6 are in close contact with each other, and the lubrication effect is improved. Bearing 3 7 uses angular contact ball bearings for the reason of considering disassembly. If a short cylindrical bearing is used, because the inner ring and outer ring of the short cylindrical bearing are separated, only the outer ring can be removed during disassembly, and the inner ring of the short cylindrical bearing will be on the shaft and cannot be disassembled. The inner and outer rings of the angular contact ball bearing are integrated, and the inner ring of the angular contact ball bearing can be pulled out together.

[0031] The lubricating oil is collected through the collecting hole 320, and the collected lubricating oil flows out through the oil leakage hole 92 in the groove 91 to lubricate the bearing 1 5 and the bearing 2 6. The lubricating oil after lubrication of the bearing 1 5 and the bearing 2 6 will flow to the bearing 3 7, so that the bearing 1 5, the bearing 2 6 and the bearing 3 7 are all completely lubricated. Through the setting of the clearance ring 8, a space is created between the bearing 1 5 and the bearing 2 6 to prevent the lubricating oil from being unable to completely lubricate the bearing 2 6, the bearing 1 5 and the bearing 3 7 when the bearing 1 5 and the bearing 2 6 are tightly fitted.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A bearing lubrication device for a dry screw vacuum pump, comprising a protective shell (1) and a rotor shaft (2), characterized in that: The middle part of the protective shell (1) passes through the shaft body rotatably connected to the rotor shaft (2); the inner wall of the protective shell (1) is fixedly connected to a bearing seat (3); the lower part of the bearing seat (3) is provided with an oil-releasing plate (4); the middle part of the oil-releasing plate (4) is fixedly connected to the shaft body of the rotor shaft (2); the inner wall of the shell of the bearing seat (3) is provided with a bearing three (7); the upper part of the bearing three (7) is provided with a bearing two (6); the upper part of the bearing two (6) is provided with an oil-separating plate (9); the outer wall of the oil-separating plate (9) is sleeved with a clearance ring (8); the upper part of the oil-separating plate (9) is provided with a bearing one (5).

2. A bearing lubrication device for a dry screw vacuum pump according to claim 1, characterized in that: The oil separator (9) comprises: a groove (91) and an oil leakage hole (92). The groove (91) is provided in the middle of the oil separator (9), and a plurality of oil leakage holes (92) are provided on the inner wall of the groove (91).

3. The bearing lubrication device for a dry screw vacuum pump according to claim 2, characterized in that: The thickness of the oil separator (9) is consistent with the thickness of the gap ring (8).

4. The bearing lubrication device for a dry screw vacuum pump according to claim 1, characterized in that: The bearing seat (3) comprises: a fitting tube (31) and a top ring (32); the end of the bearing seat (3) is fixedly connected to one end of the fitting tube (31), and the other end of the fitting tube (31) is fixedly connected to the end of the top ring (32).

5. The bearing lubrication device for a dry screw vacuum pump according to claim 4, characterized in that: The top ring (32) further comprises a collecting hole (320), and the outer wall of the top ring (32) is provided with the collecting hole (320).

6. The bearing lubrication device for a dry screw vacuum pump according to claim 1, characterized in that: The bearing three (7) is an angular contact ball bearing.

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