Oil control structure and molecular pump having the same

Abstract

The present invention provides an oil control structure, which belongs to the field of molecular pump oil supply technology, and includes: a base, with a main shaft and a bearing inside, and an oil through hole and an oil outlet hole inside the main shaft; a baffle control unit, which is fixedly arranged in the base and sleeved on the outside of the main shaft, the annular inner wall of the baffle control unit is opposite to the oil outlet hole, and the annular inner wall of the baffle control unit is provided with a first oil leakage hole; an annular flange is provided on the baffle control unit, and a second oil leakage hole is provided on the annular flange, and the lower part of the second oil leakage hole is connected to the bearing; a circulating oil circuit is also provided in the base, and the lubricating oil is suitable for flowing back into the circulating oil circuit along the upper surface of the annular flange. The oil control structure provided by the present invention blocks the lubricating oil thrown out from the oil outlet hole by setting a baffle control unit to prevent the lubricating oil from splashing everywhere, and the lubricating oil can only flow to the bearing through the first oil leakage hole and the second oil leakage hole, so the flow rate of the lubricating oil is controlled to prevent excessive lubricating oil from flowing to the bearing, thereby reducing the heat generated by the bearing when running at high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of molecular pump oil supply, and in particular to an oil control structure and a molecular pump having the oil control structure. Background Art

[0002] During the high-speed rotation of the molecular pump, a large amount of friction is generated at the bearings, which generates a large amount of heat. Such friction and heat will reduce the service life of the bearings. In order to reduce the friction and heat at the bearings, the bearings are generally lubricated by splashing oil through the oil supply cone.

[0003] For example, Chinese patent document CN201461519U discloses a molecular pump oil supply cone, which has a through hole for the flow of lubricating oil in the oil supply cone body, and a lower bearing lubrication hole at a position corresponding to the bearing; when in use, the oil supply cone body rotates, and then the lubricating oil is supplied to the bearing in the form of splashing through the lower bearing lubrication hole.

[0004] However, with the above solution, due to the machining error of the oil supply cone, there will be an unstable oil supply problem during the rotation and oil supply of the oil supply cone body. When the oil supply is too large, the excessive lubricating oil will increase the rolling resistance of the bearing beads, increase the bearing temperature, and affect the service life of the bearing. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the amount of oil is too large when the oil supply cone is used to supply oil to the molecular pump.

[0006] In order to solve the above technical problems, the present invention provides an oil control structure, comprising:

[0007] The base has a main shaft and a bearing for connecting the main shaft, the main shaft has an oil hole arranged along the axial direction, and the main shaft also has an oil outlet hole arranged along the circumferential direction, and the oil outlet hole is connected to the oil hole;

[0008] a stopper, fixedly disposed in the base, the stopper being an annular structure sleeved outside the main shaft, the annular inner wall of the stopper being opposite to the oil outlet hole, and the annular inner wall of the stopper having a plurality of first oil leakage holes penetrating the annular wall of the stopper;

[0009] An annular flange is provided on the outer circumference of the annular wall of the shift control unit, the annular flange is located below the first oil leakage hole, and the annular flange has a plurality of second oil leakage holes, the lower parts of the second oil leakage holes are connected to the bearing;

[0010] The base also has a circulating oil circuit, which is arranged below the gear control unit. The lubricating oil is suitable for flowing back into the circulating oil circuit along the upper surface of the annular flange.

[0011] The upper surface of the annular flange is an outwardly inclined slope structure.

[0012] The gear control unit is a split structure, including the annular flange and the oil deflector ring. A groove is provided on the upper surface of the annular flange. The oil deflector ring is clamped in the groove. The first oil leakage hole is provided on the oil deflector ring.

[0013] The first oil leakage hole and the oil outlet hole are both arranged perpendicular to the axis of the main shaft, and the second oil leakage hole is arranged parallel to the axis of the main shaft.

[0014] A plurality of the first oil leakage holes and the second oil leakage holes are arranged at intervals, and the first oil leakage holes and the second oil leakage holes are arranged in a one-to-one correspondence.

[0015] A bearing locking block is fixedly provided on the upper surface of the inner ring of the bearing, and the bearing locking block is fixedly connected to the outer wall of the main shaft. The bearing locking block is provided with a connecting hole that passes through the bearing locking block and is connected to the oil outlet hole.

[0016] A gap is set between the annular inner wall of the stop control unit and the bearing locking block, and the gap is connected to the bearing.

[0017] The outer ring of the bearing is connected to a bearing seat, and the annular flange is arranged on the bearing seat.

[0018] A mounting hole is provided on the annular flange, and a fastener is passed through the mounting hole and fastened to the bearing seat to connect the stop control unit with the bearing seat.

[0019] The present invention also provides a molecular pump comprising the above-mentioned oil control structure.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The present invention provides an oil control structure, which transports lubricating oil to the bearings arranged on the main shaft by arranging an oil through hole and an oil outlet hole, and arranges a block control unit on the outer shell of the main shaft to block the lubricating oil thrown out from the oil outlet hole to prevent the lubricating oil from splashing everywhere, and a first oil leakage hole and a second oil leakage hole are arranged on the block control unit. The lubricating oil output from the oil outlet hole can flow to the bearings through the first oil leakage hole and the second oil leakage hole, thereby controlling the flow of the lubricating oil, preventing excessive lubricating oil from flowing to the bearings, and reducing the heat generated by the bearings when running at high speed, and excess lubricating oil can flow from the upper surface of the annular flange to the circulating oil circuit, so that the excess lubricating oil can be recycled.

[0022] 2. The present invention provides an oil control structure in which the upper surface of the annular flange is configured as an outward-inclined slope structure, which makes it easier for excess lubricating oil to flow from the slope structure into the circulating oil circuit, thereby improving the oil control effect of the gear control unit.

[0023] 3. The oil control structure provided by the present invention sets the baffle control unit as a split structure consisting of an annular flange and an oil retaining ring, which facilitates the processing and manufacturing of the baffle control unit; and, by opening a groove on the upper surface of the annular flange so that the oil retaining ring can be clamped in the groove, it is more convenient to assemble the oil retaining ring and the annular flange.

[0024] 4. The oil control structure provided by the present invention better fits the flow path of the lubricating oil by arranging the first oil leakage hole and the oil outlet hole perpendicular to the axis of the main shaft and arranging the second oil leakage hole parallel to the axis of the main shaft, and is simple and convenient to process and manufacture.

[0025] 5. The present invention provides an oil control structure in which a plurality of first and second oil leakage holes are provided. This ensures that the lubricating oil will not splash when flowing out of the oil outlet hole and the amount of oil will not be excessive, while the amount of lubricating oil will not be too insufficient, thereby ensuring sufficient lubrication of the bearing. The first and second oil leakage holes are provided in a one-to-one correspondence, which makes it easier for the lubricating oil to flow from the first oil leakage hole to the second oil leakage hole, thereby ensuring lubrication efficiency.

[0026] 6. The present invention provides an oil control structure, which limits the axial movement of the bearing by setting a bearing locking block, and opens a connecting hole connected to the oil outlet on the bearing locking block to ensure that the setting of the bearing locking block does not affect the outflow of lubricating oil.

[0027] 7. The present invention provides an oil control structure, which sets a gap between the annular inner wall of the stop control unit and the bearing locking block to ensure that the main shaft and the bearing locking block can rotate smoothly inside the stop control unit, and the gap is connected to the bearing. Therefore, the small splashing oil droplets blocked by the inner wall of the stop control unit can flow to the bearing through the gap, and the outflowing lubricating oil can be fully utilized.

[0028] 8. The present invention provides an oil control structure, which fixes the bearing by arranging a bearing seat on the outer ring of the bearing, and arranges the annular flange of the stop control unit on the bearing seat to facilitate the installation of the stop control unit.

[0029] 9. The present invention provides an oil control structure, which realizes a detachable connection between the stop control unit and the bearing seat by opening a mounting hole on the annular flange and connecting the annular flange to the bearing seat with fasteners, making it easier to install and replace the stop control unit and facilitate maintenance.

[0030] 10. The present invention provides a molecular pump that utilizes the above-mentioned oil control structure to control the lubricating oil flowing to the bearing, thereby preventing excessive lubricating oil from flowing to the bearing and reducing the heat generated by the bearing during high-speed operation. In addition, the excess lubricating oil can flow back into the circulating oil circuit, thereby allowing the excess lubricating oil to be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the overall structure of the oil control structure provided by an embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a gear shift control provided by an embodiment of the present invention;

[0034] Figure 3 This is a front cross-sectional view of a gear shift control provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Spindle; 2. Oil hole; 3. Oil outlet hole; 4. Bearing; 5. Oil retaining ring; 6. First oil leakage hole; 7. Annular flange; 8. Second oil leakage hole; 9. Circulating oil circuit; 10. Bearing locking block; 11. Connecting hole; 12. Bearing seat; 13. Mounting hole; 14. Base. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figures 1 to 3 A specific embodiment of the oil control structure shown includes a base 14, a main shaft 1 rotatably arranged inside the base 14, and a bearing 4 connected to the main shaft 1. The center of the main shaft 1 is provided with an axially arranged oil hole 2, the lower end of the oil hole 2 can be connected to the oil pool, and the main shaft 1 is provided with a circumferentially arranged oil outlet hole 3, which passes through the main shaft 1 and is connected to the oil hole 2. The oil outlet hole 3 is located above the bearing 4. The outer sleeve of the main shaft 1 is provided with a stop control, which includes an oil retaining ring 5 and an annular flange 7 provided below the oil retaining ring 5. The annular flange 7 extends outward from the oil retaining ring 5, and the oil retaining ring 5 is provided corresponding to the oil outlet hole 3. The oil retaining ring 5 is provided with a first oil leakage hole 6 that passes through the oil retaining ring 5, and the annular flange 7 is provided with a second oil leakage hole 8 that passes through the annular flange 7, and the second oil leakage hole 8 is connected to the bearing 4. An oil circulation passage 9 is provided on the base 14 , and the upper end of the oil circulation passage 9 is provided on the outer lower side of the annular flange 7 , and the lower end of the oil circulation passage 9 is ultimately connected to the oil pool.

[0042] The lubricating oil is transported to the bearing 4 provided on the main shaft 1 by setting an oil through hole 2 and an oil outlet hole 3. The lubricating oil is blocked by setting a block control unit on the outer shell of the main shaft 1 to block the lubricating oil thrown out from the oil outlet hole 3 to prevent the lubricating oil from splashing everywhere. In addition, a first oil leakage hole 6 and a second oil leakage hole 8 are set on the block control unit. The lubricating oil output from the oil outlet hole 3 can flow to the bearing 4 through the first oil leakage hole 6 and the second oil leakage hole 8. Therefore, the flow rate of the lubricating oil is controlled to prevent excessive lubricating oil from flowing to the bearing 4, thereby reducing the heat generated by the bearing 4 when running at high speed. In addition, the excess lubricating oil can flow from the upper surface of the annular flange 7 to the circulating oil circuit 9, so that the excess lubricating oil can be recycled.

[0043] In this embodiment, the upper surface of the annular flange 7 is inclined outward to form a slope structure, which makes it easier for excess lubricating oil to flow from the slope structure into the circulating oil path 9, thereby improving the oil control effect of the gear shift control unit.

[0044] In this embodiment, if Figure 3 As shown, a groove is formed on the upper surface of the annular flange 7, and the lower end of the oil slinger 5 is snapped into the groove. Providing the slinger control as a separate structure consisting of the annular flange 7 and the oil slinger 5 facilitates the processing and manufacturing of the slinger control; and by forming a groove on the upper surface of the annular flange 7 so that the oil slinger 5 can be snapped into the groove, the assembly of the oil slinger 5 and the annular flange 7 is further facilitated.

[0045] In this embodiment, if Figure 1 and 3 As shown, the first oil leakage hole 6 and the oil outlet hole 3 are both arranged perpendicular to the axis of the main shaft 1, and the second oil leakage hole 8 is arranged parallel to the axis of the main shaft 1, which is more in line with the flow path of the lubricating oil and is simple and convenient to process and manufacture.

[0046] In this embodiment, if Figure 2 As shown, multiple first oil leakage holes 6 and second oil leakage holes 8 are provided at intervals and are arranged in a one-to-one correspondence. This ensures that the lubricating oil does not splash out of the oil outlet 3 and the amount of oil is not excessive, while also ensuring that the amount of lubricating oil is not too insufficient, thereby ensuring sufficient lubrication of the bearing 4. In addition, the lubricating oil can flow from the first oil leakage holes 6 to the second oil leakage holes 8, thereby ensuring lubrication efficiency.

[0047] like Figure 1 As shown, the main shaft 1 is also provided with a bearing locking block 10. The inner wall of the bearing locking block 10 is connected to the outside of the main shaft 1, and the lower end of the bearing locking block 10 is connected to the upper surface of the inner ring of the bearing 4 to limit the axial movement of the bearing 4. The bearing locking block 10 is provided with a connecting hole 11 corresponding to the oil outlet hole 3 to ensure that the setting of the bearing locking block 10 does not affect the outflow of lubricating oil. Figure 1 As shown, a gap is set between the inner wall of the stop control and the outer wall of the bearing locking block 10 to ensure that the main shaft 1 and the bearing locking block 10 rotate smoothly inside the stop control, and the gap is connected to the bearing 4. Therefore, the small splashing oil droplets blocked by the inner wall of the stop control can flow to the bearing 4 through the gap, and the outflowing lubricating oil can be fully utilized.

[0048] like Figure 1 As shown, a bearing seat 12 is provided on the inner wall of the base 14. The outer ring of the bearing 4 is connected to the inner wall of the bearing seat 12 to securely mount the bearing 4. The upper surface of the bearing seat 12 is positioned higher than the upper surface of the bearing 4. The annular flange 7 is connected to the upper surface of the bearing seat 12. Therefore, a gap suitable for the flow of lubricating oil is formed between the lower surface of the annular flange 7 and the upper surface of the bearing 4.

[0049] like Figure 1 and 2As shown, the annular flange 7 is further provided with mounting holes 13. The mounting holes 13 are arranged along the outer circumference of the annular flange 7 and are provided at intervals. Bolts serving as fasteners are passed through the mounting holes 13 and fastened to the bearing seat 12 to connect the stop control to the bearing seat 12. This achieves a detachable connection between the stop control and the bearing seat 12, making it easier to install and replace the stop control and facilitate maintenance.

[0050] A specific embodiment of a molecular pump is also provided, including the above-mentioned oil control structure, so as to utilize the oil control structure to control the lubricating oil flowing to the bearing 4, avoid excessive lubricating oil flowing to the bearing 4, ensure good heat dissipation of the bearing 4, and the excess lubricating oil can flow into the circulating oil circuit 9 again, so that the excess lubricating oil can be recycled.

[0051] When using the oil control structure of this embodiment, when the main shaft 1 rotates, the lubricating oil is transported upward through the oil hole 2 and flows out of the main shaft 1 from the oil outlet hole 3. When the oil outlet hole 3 and the connecting hole 11 rotate to be connected with the first oil leakage hole 6, the lubricating oil flows out through the first oil leakage hole 6 and falls onto the annular flange 7. Part of the lubricating oil flows onto the bearing 4 through the second oil leakage hole 8, and the excess lubricating oil flows into the circulating oil path 9 through the upper surface of the annular flange 7.

[0052] To sum up, the oil control structure provided in this embodiment blocks the lubricating oil thrown out from the oil outlet hole by arranging a baffle control unit on the outer sleeve of the main shaft to prevent the lubricating oil from splashing everywhere, and a first oil leakage hole and a second oil leakage hole are set on the baffle control unit. The lubricating oil output from the oil outlet hole can flow to the bearing through the first oil leakage hole and the second oil leakage hole. Therefore, the flow rate of the lubricating oil is controlled to prevent excessive lubricating oil from flowing to the bearing, thereby ensuring good heat dissipation of the bearing, and excess lubricating oil can flow from the upper surface of the annular flange into the circulating oil circuit, so that the excess lubricating oil can be recycled.

[0053] As an alternative embodiment, the number and diameter of the first and second oil leakage holes 6, 8, as well as their relative positions, can be adjusted based on the demand for lubricating oil. When the oil supply is high, the first and second oil leakage holes 6, 8 can be offset to reduce the amount of oil flowing into the second oil leakage holes 8. Therefore, by adjusting the relative positions of the first and second oil leakage holes 6, 8, the lubricating oil supply can be easily adjusted.

[0054] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An oil control structure, characterized in that: include: A base (14) has a main shaft (1) and a bearing (4) for connecting the main shaft (1) therein, wherein the main shaft (1) has an oil hole (2) arranged in the axial direction, and the main shaft (1) also has an oil outlet hole (3) arranged in the circumferential direction, and the oil outlet hole (3) is communicated with the oil hole (2); a stopper control fixedly disposed in the base (14), the stopper control being an annular structure sleeved outside the main shaft (1), the annular inner wall of the stopper control being opposite to the oil outlet hole (3), and the annular inner wall of the stopper control being provided with a plurality of first oil leakage holes (6) penetrating the annular wall of the stopper control; An annular flange (7) is provided on the outer circumference of the annular wall of the gear control unit, and the annular flange (7) is located below the first oil leakage hole (6). The annular flange (7) has a plurality of second oil leakage holes (8), and the lower part of the second oil leakage holes (8) is connected to the bearing (4); The base (14) further comprises a circulating oil circuit (9), which is arranged below the gear control unit, and lubricating oil is adapted to flow back into the circulating oil circuit (9) along the upper surface of the annular flange (7); A bearing locking block (10) is fixedly provided on the upper surface of the inner ring of the bearing (4), and the bearing locking block (10) is fixedly connected to the outer wall of the main shaft (1). A connecting hole (11) is provided on the bearing locking block (10) and passes through the bearing locking block (10) and is connected to the oil outlet hole (3); The first oil leakage hole (6), the connecting hole (11) and the oil outlet hole (3) are at the same height in the vertical direction, and the upper end surface of the gear control unit is higher than the oil outlet hole (3) and the connecting hole (11).

2. The oil control structure according to claim 1, characterized in that: The upper surface of the annular flange (7) is an outwardly inclined slope structure.

3. The oil control structure according to claim 1 or 2, characterized in that: The control unit is a split structure, comprising the annular flange (7) and the oil deflector ring (5); a groove is provided on the upper surface of the annular flange (7); the oil deflector ring (5) is snapped into the groove; and the first oil leakage hole (6) is provided on the oil deflector ring (5).

4. The oil control structure according to claim 1 or 2, characterized in that: The first oil leakage hole (6) and the oil outlet hole (3) are both arranged perpendicular to the axis of the main shaft (1), and the second oil leakage hole (8) is arranged parallel to the axis of the main shaft (1).

5. The oil control structure according to claim 1 or 2, characterized in that: A plurality of the first oil leakage holes (6) and the second oil leakage holes (8) are arranged at intervals, and the first oil leakage holes (6) and the second oil leakage holes (8) are arranged in a one-to-one correspondence.

6. The oil control structure according to claim 1 or 2, characterized in that: A gap is provided between the annular inner wall of the stop control unit and the bearing locking block (10), and the gap is communicated with the bearing (4).

7. The oil control structure according to claim 1 or 2, characterized in that: A bearing seat (12) is connected to the outer ring of the bearing (4), and the annular flange (7) is arranged on the bearing seat (12).

8. The oil control structure according to claim 7, characterized in that: A mounting hole (13) is provided on the annular flange (7), and a fastener is passed through the mounting hole (13) and fastened to the bearing seat (12) to connect the stop control unit with the bearing seat (12).

9. A molecular pump, characterized in that: The invention comprises the oil control structure according to any one of claims 1 to 8.

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