Roots oil pump capable of preventing lubricating oil pollution
By setting up oil drain holes and oil return mechanisms in the Roots oil pump, the lubricant oil pollution caused by medium leakage is solved, and good lubrication of the bearing is achieved and service life is extended.
Patent Information
- Application Number
- CN202422213501.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-09-10
AI Technical Summary
When the existing Roots oil pump is damaged in mechanical seal, the medium leaks into the lubricating oil cavity, resulting in lubricating oil contamination and affecting the bearing lubricating effect and service life.
An oil drain hole and an oil return mechanism are installed in the Roots oil pump to discharge the leakage medium through the oil drain hole, and the oil return chamber is used to guide the medium to the inlet side of the pump to prevent the medium from entering the bearing seat and prevent lubricating oil contamination.
Effectively prevent lubricating oil pollution, ensure good lubrication of bearings, reduce temperature and extend service life.
Smart Images
Figure CN223203244U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil pumps, in particular to a Roots oil pump capable of preventing lubricating oil from being contaminated. Background Art
[0002] The Roots oil pump is mainly composed of pump body, cam rotor, housing, rear bearing seat, bearing pump cover, driving shaft, driven shaft, left and right positioning covers and other parts. It mainly has the following problems:
[0003] If the mechanical seal is damaged, the medium in the pump will leak out from the damaged part of the mechanical seal due to the high pressure and enter the cavity of the box. Since there is no oil drain hole in the cavity of the box, the leaked medium will accumulate more and more in the cavity. In this way, the medium will enter the lubricating oil cavity of the box from the skeleton oil seal, causing lubricating oil contamination, thereby resulting in poor lubrication of the bearings in the bearing pump cover, high temperature and short service life.
[0004] Due to the high pressure of the medium in the pump, although the rear bearing seat is equipped with a skeleton oil seal for protection, some of the medium will enter the bearing in the rear bearing seat, resulting in poor bearing lubrication, high temperature and short service life. Utility Model Content
[0005] The utility model aims to provide a Roots oil pump which can prevent lubricating oil from being contaminated, so as to improve the lubrication effect and avoid the contamination of the lubricating oil.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a Roots oil pump for preventing lubricating oil contamination, comprising a housing, a bearing pump cover is installed on one side of the housing, and a driving shaft and a driven shaft are rotatably connected inside the bearing pump cover, one side of the pump body is installed on the other side of the housing, a bearing seat is installed on the other side of the pump body, and the driving shaft and the driven shaft are both rotatably connected to the bearing seat, oil deflector plates are installed outside the driving shaft and the driven shaft, a cavity is opened in the housing, and the oil deflector plate is placed in the cavity; an oil return mechanism is provided in the bearing seat, and the oil return mechanism is opened on the inlet side of the bearing seat.
[0007] Preferably, oil drain holes are symmetrically provided on both sides of the cavity.
[0008] Preferably, the oil deflector is fixed to the driving shaft and the driven shaft by screws.
[0009] Preferably, the oil return mechanism includes a pair of oil return chambers and oil return grooves interconnected with each other, a pair of oil seal skeletons are installed in the driving shaft hole and the driven shaft hole of the bearing seat, and the oil return chamber connects the gap between the pair of oil seal skeletons.
[0010] Preferably, the cavity is opened on the inner side of the second oil seal skeleton.
[0011] Compared with the prior art, the beneficial effects of the present invention are:
[0012] By setting up the oil drain hole, the medium leaking from the seal will be discharged from the oil drain hole and will not enter the lubricating oil chamber to cause lubricating oil pollution. And by setting up the oil baffle, the oil is prevented from splashing directly onto the oil seal frame, ensuring good lubrication, low temperature and long service life of the bearings in the box.
[0013] By setting a gap between the oil seal frames of the bearing seat and setting an oil return chamber and an oil return groove between the gaps, the leaked medium will flow back to the inlet side of the pump through the oil return groove and the oil return chamber, so that the medium will not enter the bearing in the rear bearing cover and cause lubricating oil contamination. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional view of a Roots oil pump in the prior art.
[0015] Figure 2 This is a cross-sectional view of the Roots oil pump of the present utility model.
[0016] Figure 3 This is a cross-sectional view of the box body of the present utility model.
[0017] Figure 4 It is a side view of the box body of the present utility model.
[0018] Figure 5 This is a cross-sectional view of the bearing seat of the present utility model.
[0019] Figure 6 It is a side view of the bearing seat of the present utility model.
[0020] Figure 7 It is a side view of the Roots oil pump of the present utility model.
[0021] 1. Housing; 2. Driving shaft; 3. Driven shaft; 4. Oil baffle; 5. Cavity; 6. Oil drain hole; 7. Pump body; 8. Bearing seat; 9. Oil return chamber; 10. Oil return groove; 11. Oil seal frame; 12. Bearing cover with holes; 13. Bearing cover without holes; 14. Rear bearing cover; 15. Second oil seal frame; 16. Bearing pump cover. DETAILED DESCRIPTION
[0022] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0023] See also Figure 2-7 The present utility model provides a technical solution: a Roots oil pump for preventing lubricating oil contamination, comprising a housing 1, a bearing pump cover 16 being installed on one side of the housing 1, and a driving shaft 2 and a driven shaft 3 being rotatably connected in the bearing pump cover 16, a perforated bearing cover 12 and a non-perforated bearing cover 13 for sealing being installed on the outside of the bearing pump cover 16, and the end of the driving shaft 2 passes through the perforated bearing cover 12. One side of the pump body 7 is installed on the other side of the housing 1, a bearing seat 8 is installed on the other side of the pump body 7, and both the driving shaft 2 and the driven shaft 3 are rotatably connected to the bearing seat 8. A rear bearing cover 14 is installed on the outside of the bearing seat 8. The above is the existing Roots oil pump structure, which will not be described in detail here.
[0024] A second oil seal skeleton 15 is installed within the housing 1, isolating the bearing from the pump body 7. To prevent leaked media from directly acting on the second oil seal skeleton 15, an oil deflector 4 is mounted on the outside of the driving shaft 2 and the driven shaft 3. The oil deflector 4 is fixed to the driving shaft 2 and the driven shaft 3 with screws. The second oil seal skeleton 15 is set in the housing 1 and fits closely to the driving shaft 2 and the driven shaft 3.
[0025] The housing 1 defines a cavity 5, which is located inside the second oil seal frame 15. An oil deflector 4 is positioned within the cavity 5. Leaked media, upon impacting the oil deflector 4, flows into the cavity 5. Oil drain holes 6 are symmetrically formed on either side of the cavity 5. Leaked media from the mechanical seal is discharged through these drain holes 6, preventing it from entering the housing's lubricating oil chamber and contaminating the lubricating oil. This ensures good lubrication, low temperatures, and a long service life for the bearings within the bearing pump cover.
[0026] The bearing seat 8 is provided with an oil return mechanism, which is located on the inlet side of the bearing seat 8. The oil return mechanism includes a pair of interconnected oil return chambers 9 and an oil return groove 10. A pair of oil seal skeletons 11 are installed in the driving shaft hole and the driven shaft hole of the bearing seat 8, which are also used to isolate the bearing from the pump body 7. The oil return chamber 9 connects to the gap between the pair of oil seal skeletons 11. The oil return groove 10 is arc-shaped and is located on the side close to the oil inlet of the pump body. Leaked media will flow back to the inlet side of the pump through the gap, the oil return groove, and the oil return chamber, preventing the media from entering the bearing in the rear bearing cover 14 and causing lubricating oil contamination.
[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A Roots oil pump for preventing lubricating oil contamination, comprising a housing (1), a bearing pump cover (16) being mounted on one side of the housing (1), a driving shaft (2) and a driven shaft (3) being rotatably connected in the bearing pump cover (16), one side of a pump body (7) being mounted on the other side of the housing (1), a bearing seat (8) being mounted on the other side of the pump body (7), and both the driving shaft (2) and the driven shaft (3) being rotatably connected to the bearing seat (8), characterized in that: The driving shaft (2) and the driven shaft (3) are both equipped with oil baffles (4), a cavity (5) is provided in the box body (1), and the oil baffle (4) is placed in the cavity (5); An oil return mechanism is provided in the bearing seat (8), and the oil return mechanism is opened on the inlet side of the bearing seat (8).
2. The Roots oil pump for preventing lubricating oil pollution according to claim 1, characterized in that: Oil drain holes (6) are symmetrically provided on both sides of the cavity (5).
3. The Roots oil pump for preventing lubricating oil pollution according to claim 1, characterized in that: The oil baffle plate (4) is fixed to the driving shaft (2) and the driven shaft (3) by screws.
4. The Roots oil pump for preventing lubricating oil pollution according to claim 1, characterized in that: The oil return mechanism comprises a pair of oil return chambers (9) and an oil return groove (10) that are interconnected. A pair of oil seal skeletons (11) are installed in the driving shaft hole and the driven shaft hole of the bearing seat (8), and the oil return chamber (9) is connected to the gap between the pair of oil seal skeletons (11).
5. The Roots oil pump for preventing lubricating oil pollution according to claim 1, characterized in that: The cavity (5) is opened inside the second oil seal skeleton (15).