Oil leakage prevention structure of rotary jet pump
By setting breathing holes on the bearing cap and bearing box of the rotary spray pump, the oil leakage problem during high-speed rotation is solved, and the long-term safe and stable operation of the pump is achieved.
Patent Information
- Application Number
- CN202422487148.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-15
AI Technical Summary
When the rotary jet pump rotates at high speed, there is oil leakage in the bearing at the rotor end, resulting in a lower oil level in the bearing box and poor lubrication, which affects the long-term safe and stable operation of the pump.
A breathing hole is provided on the bearing cap and the bearing box to allow external air to enter the outer circumference of the rotor chamber through the breathing hole, eliminate the negative pressure of the bearing cap and the shaft part, and prevent air and lubricating oil from mixing into the rotor chamber.
Effectively prevent oil leakage from bearings, ensure long-term safe and stable operation of the pump, and avoid lubricating oil loss caused by negative pressure.
Smart Images
Figure CN223257113U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pumps, in particular to an oil leakage prevention structure for a rotary jet pump. Background Art
[0002] A rotary jet pump is a centrifugal pump whose drum 1 and impeller 2 rotate synchronously with the liquid. When the pump operates at speeds exceeding 3000 r / min, oil leakage from the rotor-end bearing can occur. The oil level 5 in the bearing housing 4 gradually decreases, resulting in poor bearing lubrication and a loss of long-term safe and stable operation of the pump.
[0003] Cause analysis: When the rotor components rotate at high speed, the outer periphery of the high-speed rotating rotor components drives the air between the bearing box and the rotor components to rotate at high speed. Under the action of centrifugal force, the pressure on the outer periphery of the rotor is high, and negative pressure is formed at the bearing cover 6 and the shaft 7. External air 8 enters the bearing box through the oiling exhaust cap 9 and mixes with the oil at the bearing ball 10. The oil-gas mixture enters the outer periphery 12 of the rotor cavity through the gap 11 between the bearing cover and the shaft, causing oil leakage. Summary of the Invention
[0004] The utility model aims to solve the above technical problems and provide an oil leakage prevention structure for a rotary jet pump.
[0005] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is: a rotary jet pump anti-leakage structure, including a shaft, the shaft is connected to the bearing box through a bearing, a bearing cover is provided on one side of the bearing, a plurality of breathing holes A are provided on the bearing cover, and a plurality of breathing holes B are provided on the bearing box. The breathing holes A are connected to the breathing holes B, and external air enters the outer periphery of the rotor cavity through the breathing holes B and the breathing holes A to eliminate the negative pressure between the bearing cover and the shaft.
[0006] Preferably, the breathing hole A is a circular hole or an oblong hole provided in the bearing gland outside the sealing O-ring, and the breathing hole B is a circular hole or an oblong hole provided in the corresponding position of the bearing box.
[0007] Preferably, the plurality of breathing holes A and breathing holes B are symmetrically arranged to ensure symmetry of the pressure axis of the rotor component and avoid vibration.
[0008] Compared with the traditional structure, the beneficial effects of the present invention are: the structural design is reasonable, and breathing holes are set at the bearing box and the front cover to allow external air to enter the periphery of the rotor component, eliminating the negative pressure between the bearing cover and the shaft, and preventing the air in the bearing box from mixing with the lubricating oil in the bearing and being drawn into the periphery of the rotor component, thereby solving the problem of bearing oil leakage and ensuring the long-term safe and stable operation of the pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1This is a schematic diagram of the flow of air, gas and oil in a conventional rotary jet pump;
[0010] Figure 2 This is a schematic diagram of the structure of the utility model;
[0011] Figure 3 for Figure 2 Schematic diagram of the breathing hole structure of the bearing box at AA in the middle;
[0012] Figure 4 for Figure 2 Schematic diagram of the breathing hole structure of the bearing box at AA in the middle (part 2);
[0013] Figure 5 This is a schematic diagram of the breathing hole structure of the bearing gland of the utility model;
[0014] In the figure: 1. Drum, 2. Impeller, 3. Bearing, 4. Bearing box, 5. Oil level, 6. Bearing cover, 7. Shaft, 8. External air, 9. Oiling and exhaust cap, 10. Bearing balls, 11. Gap between bearing cover and shaft, 12. Outer periphery of rotor cavity, 13. Breathing hole A, 14. Breathing hole B. DETAILED DESCRIPTION
[0015] The utility model is further described below.
[0016] Refer to the attached Figure 1 A rotary jet pump oil leakage prevention structure includes a shaft 7, which is connected to a bearing box 4 through a bearing 3. A bearing cover 6 is provided on one side of the bearing 3. The bearing cover 6 is provided with a plurality of breathing holes A13, and the bearing box 4 is provided with a plurality of breathing holes B14. The breathing holes A13 are connected to the breathing holes B14. External air enters the outer periphery 12 of the rotor cavity through the breathing holes B14 and the breathing holes A13 to eliminate the negative pressure between the bearing cover 6 and the shaft 7.
[0017] In this preferred embodiment, the breathing hole A13 is a circular hole or an oblong hole provided in the bearing cover 6 outside the sealing O-ring, and the breathing hole B14 is a circular hole or an oblong hole provided in the corresponding position of the bearing box 4.
[0018] In this preferred embodiment, the plurality of breathing holes A13 and breathing holes B14 are symmetrically arranged to ensure symmetry of the pressure axis of the rotor component and avoid vibration.
[0019] During specific implementation, external air enters the outer periphery 12 of the rotor cavity through the breathing holes B14 and A13 in the bearing box 4 and the bearing front cover, eliminating the negative pressure in the bearing cover 6 and the shaft 7, and preventing the air in the bearing box 4 from mixing with the lubricating oil in the bearing 3 and being drawn into the outer periphery of the rotor components, thereby solving the problem of bearing oil leakage and ensuring the long-term safe and stable operation of the pump.
[0020] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the scope of protection of the present invention. All equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.
Claims
1. A rotary jet pump oil leakage prevention structure, comprising a shaft (7), wherein the shaft (7) is connected to a bearing box (4) via a bearing (3), and a bearing gland (6) is provided on one side of the bearing (3), characterized in that: The bearing cover (6) is provided with a plurality of breathing holes A (13), and the bearing box (4) is provided with a plurality of breathing holes B (14). The breathing holes A (13) are connected to the breathing holes B (14), and external air enters the outer periphery (12) of the rotor cavity through the breathing holes B (14) and the breathing holes A (13), so as to eliminate the negative pressure at the position of the bearing cover (6) and the shaft (7).
2. The anti-oil leakage structure of the rotary jet pump according to claim 1, characterized in that: The breathing hole A (13) is a circular hole or an oblong hole provided in a portion of the bearing cover (6) other than the sealing O-ring, and the breathing hole B (14) is a circular hole or an oblong hole provided in a corresponding portion of the bearing box (4).
3. The anti-oil leakage structure of the rotary jet pump according to claim 1, characterized in that: The plurality of breathing holes A (13) and breathing holes B (14) are symmetrically arranged to ensure that the rotor component is symmetrical about the compression axis.