Oil leakage prevention structure at high-speed rotor

Abstract

The utility model relates to an oil leakage prevention structure at a high-speed rotor. The oil tank comprises a tank body which is provided with a main oil return hole; the rotor assembly comprises a rotating shaft and an impeller which are connected, the rotating shaft is supported by a bearing, the bearing is arranged on the box body, and the rotating shaft comprises an oil sealing section; an inner hole of the oil sealing ring extends in the radial direction to form a plurality of sealing rings making contact with the oil sealing section, an oil return cavity is formed among the bearing, the oil sealing ring and the rotating shaft, and at least two pressure relief cavities are formed among the sealing rings and the oil sealing section. The pressure relief cavity and the oil return cavity are respectively communicated with the main oil return hole; and the air sealing ring is arranged on the box body and is close to the impeller, and a cavity communicated with the atmosphere is formed between the air sealing ring and the oil sealing ring. According to the utility model, the sealing effect at the high-speed rotor is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to an oil leakage prevention structure for a high-speed rotor. Background Technology

[0002] In existing technologies, the high-speed rotor of a single-stage high-speed centrifugal fan using gear speed increase typically employs a sawtooth labyrinth structure for oil sealing. However, due to limited axial space, the sealing effect of this oil seal structure is relatively limited. Furthermore, the pressure relief chamber in the labyrinth structure has a return oil hole at its bottom, which is connected to the gearbox cavity. This allows oil mist from the gearbox to easily flow back into the pressure relief chamber through the return oil hole, and further leak outwards through the gaps in the sawtooth sealing pair, thus causing environmental pollution. Summary of the Invention

[0003] Therefore, this utility model provides an oil leakage prevention structure for high-speed rotors, which greatly improves the sealing effect at high-speed rotors.

[0004] To solve the above-mentioned technical problems, this utility model provides an oil leakage prevention structure for a high-speed rotor, comprising:

[0005] The housing is equipped with a main oil return port;

[0006] A rotor assembly includes a connected shaft and an impeller, the shaft being supported by a bearing mounted on the housing, the shaft including an oil-sealed section;

[0007] An oil seal ring has multiple sealing rings extending radially from its inner hole, which contact the oil sealing section. An oil return chamber is formed between the bearing, the oil seal ring, and the rotating shaft. At least two pressure relief chambers are formed between the multiple sealing rings and the oil sealing section. Each pressure relief chamber and the oil return chamber are respectively connected to the main oil return hole.

[0008] An air seal ring is disposed on the housing and close to the impeller, and a cavity communicating with the atmosphere is formed between the air seal ring and the oil seal ring.

[0009] The pressurized oil entering the bearing passes through the gap into the oil return chamber. Part of it can enter the main oil return hole, while the other part can pass through each of the pressure relief chambers in sequence to reduce its pressure and maintain balance with the atmospheric pressure in the cavity.

[0010] In one embodiment of this utility model, the oil sealing section is provided with an oil slinger located in each of the pressure relief chambers.

[0011] In one embodiment of this utility model, two pressure relief chambers are provided, including a first pressure relief chamber and a second pressure relief chamber. The first pressure relief chamber and the second pressure relief chamber are respectively provided with a first oil return hole and a second oil return hole that communicate with the main oil return hole. The oil slinger includes a first oil slinger located in the first pressure relief chamber and a second oil slinger located in the second pressure relief chamber, which are arranged axially along the oil sealing section.

[0012] In one embodiment of this utility model, the sealing ring includes a first sealing ring, a second sealing ring, and a third sealing ring. The oil return chamber is formed between the first sealing ring, the bearing, and the rotating shaft. The first pressure relief chamber is formed between the first sealing ring, the second sealing ring, and the oil sealing section. The second pressure relief chamber is formed between the second sealing ring, the third sealing ring, and the oil sealing section.

[0013] In one embodiment of this utility model, the radial depth of the first pressure relief chamber and / or the second pressure relief chamber is not less than 20 mm.

[0014] In one embodiment of this utility model, the outer end of the sealing ring is serrated.

[0015] In one embodiment of this utility model, the main oil return hole is V-shaped and has an oil outlet that communicates with the inner cavity of the box. When the amount of oil entering the main oil return hole reaches the bottom of the oil outlet, it can form an oil trap structure to prevent oil mist from leaking out of the box.

[0016] In one embodiment of this utility model, the main oil return hole includes a first hole section and a second hole section that are connected to each other. The first hole section is connected to the oil return chamber. The first hole section extends to the end face of the housing and forms the oil outlet. A height difference is formed between the upper part of the connection between the first hole section and the second hole section and the bottom of the oil outlet, forming an oil storage bend pressure head.

[0017] In one embodiment of this utility model, the axis of the first hole segment is perpendicular to the axis of the rotating shaft.

[0018] In one embodiment of this utility model, the height difference is not less than 20mm.

[0019] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0020] The present invention discloses an oil leakage prevention structure for a high-speed rotor. This oil leakage prevention structure optimizes the sealing design without changing the axial dimension of the existing single-stage high-speed centrifugal fan, avoiding the problem of poor sealing effect caused by axial space limitation, and making it applicable to all single-stage high-speed centrifugal fans.

[0021] This leak-proof structure significantly improves oil seal performance by combining a deep pressure relief chamber on the oil seal ring with an oil-throwing groove on the high-speed rotating shaft. The oil trap on the housing prevents oil mist from leaking out of the gearbox when it reaches the bottom of the outlet, reducing oil mist contamination and improving the operating environment. The well-designed main oil return hole, first oil return hole, and second oil return hole ensure smooth return of pressurized oil entering the return chamber, preventing oil and gas accumulation. Simultaneously, the first and second oil-throwing grooves disrupt the continuity of oil and gas on the high-speed rotating shaft surface, accelerating oil discharge and improving drainage efficiency.

[0022] The oil leakage prevention structure adopts a multi-stage sealing design, including a first sealing ring, a second sealing ring, and a third sealing ring, which respectively form multiple pressure relief chambers. The oil and gas entering the pressure relief chambers gradually reduce their pressure in each stage of the sealing structure, eventually reaching a balance with the atmospheric pressure in the cavity, thereby effectively preventing lubricating oil and oil mist from leaking outward. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the oil leakage prevention structure at the high-speed rotor of this utility model.

[0025] Explanation of reference numerals in the instruction manual:

[0026] 1. Rotating shaft; 11. Oil slinger; 11a. First oil slinger; 11b. Second oil slinger; 12. Oil sealing section;

[0027] 2. Housing; 21. Main oil return hole; 21a. First hole section; 21b. Second hole section; 22. Oil outlet; 23. Bottom; 24. Inner cavity of the housing;

[0028] 3. Bearing; 4. Oil seal ring; 40. Sealing ring; 41. First sealing ring; 42. Second sealing ring; 43. Third sealing ring; 44. Oil return chamber; 45. Pressure relief chamber; 45a. First pressure relief chamber; 45b. Second pressure relief chamber; 46. Cavity; 47. First oil return hole; 48. Second oil return hole;

[0029] 5. Air seal ring; 6. Impeller; 7. Pressing components. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0031] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0032] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0033] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0034] Reference Figure 1 As shown, the present invention provides an oil leakage prevention structure for a high-speed rotor, comprising:

[0035] (Gear) housing 2, provided with a main oil return hole 21;

[0036] The rotor assembly includes a connected shaft 1 and an impeller 6. The shaft 1 is supported by a bearing 3, which is mounted on the housing 2. The shaft 1 includes an oil-sealed section 12. A clamping member 7 is provided on the shaft 1 that abuts against the outer end of the impeller 6.

[0037] Oil sealing ring 4, the inner hole of the oil sealing ring 4 extends radially with a plurality of sealing rings 40 that contact the oil sealing section 12, an oil return cavity 44 is formed between the bearing 3, the oil sealing ring 4 and the rotating shaft 1, at least two pressure relief cavities 45 are formed between the plurality of sealing rings 40 and the oil sealing section 12, and each pressure relief cavity 45 and the oil return cavity 44 are respectively connected to the main oil return hole 21;

[0038] An air seal ring 5 is disposed on the housing 2 and close to the impeller 6, and an air seal ring 5 and an oil seal ring 4 form a cavity 46 that is in communication with the atmosphere.

[0039] The pressurized oil entering the bearing 3 enters the oil return chamber 44 through the gap. Part of it can enter the main oil return hole 21, and the other part can pass through each of the pressure relief chambers 45 in sequence to reduce the pressure and maintain balance with the atmospheric pressure in the cavity 46.

[0040] Specifically, the oil sealing section 12 is provided with an oil-throwing groove 11 located in each of the pressure relief chambers 45. By providing a pressure relief chamber 45 on the oil sealing ring 4 and cooperating with the oil-throwing groove 11 on the high-speed rotating shaft 1, the oil sealing effect is effectively enhanced; the oil-throwing groove 11 can disrupt the continuity of the oil film, allowing the oil mist and liquid oil entering the pressure relief chamber 45 to separate rapidly, thereby improving the overall sealing performance of the oil seal.

[0041] In this embodiment, two pressure relief chambers 45 are provided, including a first pressure relief chamber 45a and a second pressure relief chamber 45b. The first pressure relief chamber 45a and the second pressure relief chamber 45b are respectively provided with a first oil return hole 47 and a second oil return hole 48 that communicate with the main oil return hole 21. The oil slinger 11 includes a first oil slinger 11a located in the first pressure relief chamber 45a and a second oil slinger 11b located in the second pressure relief chamber 45b, which are arranged axially along the oil sealing section 12. The first oil slinger 11a and the second oil slinger 11b are located on different diameters of the oil sealing section 12.

[0042] Specifically, the sealing ring 40 includes a first sealing ring 41, a second sealing ring 42, and a third sealing ring 43. The first sealing ring 41, the bearing 3, and the rotating shaft 1 form the oil return chamber 44. The first sealing ring 41, the second sealing ring 42, and the oil sealing section 12 form the first pressure relief chamber 45a. The second sealing ring 42, the third sealing ring 43, and the oil sealing section 12 form the second pressure relief chamber 45b. The outer ends of each sealing ring 40 are serrated, enabling them to form a sealing pair with the diameter corresponding to the oil sealing section 12.

[0043] A multi-stage sealing design is adopted to form multiple pressure relief chambers 45 (first pressure relief chamber 45a and second pressure relief chamber 45b). The oil and gas entering the pressure relief chamber 45 gradually reduce their pressure in each stage of the sealing structure, eventually reaching equilibrium with the atmospheric pressure in the cavity 46, thereby effectively preventing the leakage of lubricating oil and oil mist.

[0044] Specifically, the radial depth of the first pressure relief chamber 45a and / or the second pressure relief chamber 45b is not less than 20 mm. The deeper pressure relief chamber 45 (not less than 20 mm) and its cooperation with the oil slinger groove 11 on the high-speed rotating shaft 1 further enhance the oil sealing effect.

[0045] By combining the deep pressure relief cavity 45 (not less than 20mm) on the oil seal ring 4 with the oil slinger groove 11 on the high-speed rotating shaft 1, the oil seal performance can be greatly improved.

[0046] In one embodiment, the main oil return hole 21 is V-shaped and has an oil outlet 22 that communicates with the inner cavity 24 of the housing. When the amount of oil entering the main oil return hole 21 reaches the bottom 23 of the oil outlet 22, it can form an oil trap structure to prevent oil mist from leaking out of the housing 2.

[0047] In one embodiment, the main oil return hole 21 includes a first hole section 21a and a second hole section 21b that are connected. The first hole section 21a is connected to the oil return chamber 44. The first hole section 21a extends to the end face of the housing 2 and forms the oil outlet 22. A height difference H is formed between the upper part of the connection between the first hole section 21a and the second hole section 21b and the bottom 23 of the oil outlet 22, forming an oil storage bend pressure head.

[0048] Specifically, the axis of the first hole segment 21a is perpendicular to the axis of the rotating shaft 1.

[0049] Specifically, the height difference H (i.e., the height of the oil storage bend pressure head) is not less than 20mm.

[0050] Taking the two pressure relief chambers 45 as an example, the working principle of this utility model embodiment is as follows: a small part of the pressure oil entering the bearing 3 will enter the oil return chamber 44 through the gap, and most of the oil entering the oil return chamber 44 will enter the main oil return hole 21. When the amount of oil in the oil return hole reaches the bottom 23 of the oil outlet 22, the oil return hole forms a V-shaped oil storage bend structure. The height H of the oil storage bend pressure head remains unchanged, and the oil mist in the inner cavity of the housing 2 cannot leak out through the oil storage bend structure.

[0051] In addition, a small portion of the pressurized oil in the return oil chamber 44 passes through the sealing gap formed by the first sealing ring 41 and the rotating shaft 1. As the pressurized oil passes through this gap, its kinetic energy increases, meaning its speed increases, and its pressure and temperature decrease. After entering the first pressure relief chamber 45a, its kinetic energy is converted into heat energy, and the pressure hardly rises again, achieving the pressure reduction effect of the first sealing stage. Similarly, the second sealing ring 42 and the second pressure relief chamber 45b form the second sealing stage. The oil and gas pressure entering the second pressure relief chamber 45b further decreases to near atmospheric pressure, maintaining balance with the atmospheric pressure in the cavity 46, thus achieving the sealing purpose. During this process, the first oil slinger 11a and the second oil slinger 11b can prevent the continuous movement of oil on the high-speed shaft surface and accelerate the emptying of oil from the pressure relief chamber 45 (the oil enters the main oil return hole 21 through the first oil return hole 47 and the second oil return hole 48).

[0052] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An oil leakage prevention structure at a high speed rotor, characterized by, The utility model relates to a kind of oil seal structure of centrifugal pump, including: Box (2) is provided with total oil return hole (21); Rotor assembly, including connected rotating shaft (1) and impeller (6), the rotating shaft (1) is supported by bearing (3), the bearing (3) is arranged on the box (2), the rotating shaft (1) includes oil seal section (12); Oil seal ring (4), the inner hole of the oil seal ring (4) extends in multiple sealing rings (40) with the oil seal section (12) contact, the bearing (3), the oil seal ring (4) and the rotating shaft (1) form oil return cavity (44) between, multiple sealing ring (40) and the oil seal section (12) form at least two pressure relief cavities (45) between, each pressure relief cavity (45) and the oil return cavity (44) are communicated with the total oil return hole (21) respectively; Air seal ring (5) is arranged on the box (2) and is close to the impeller (6), and the air seal ring (5) and the oil seal ring (4) form cavity (46) communicated with atmosphere between; Wherein, the pressure oil into the bearing (3) passes through gap and enters the oil return cavity (44), part can enter the total oil return hole (21), another part can pass through each pressure relief cavity (45) in turn and keep balance with atmospheric pressure in the cavity (46) after pressure reduction.

2. The oil leakage prevention structure at a high speed rotor according to claim 1, characterized by, The oil seal section (12) is provided with oil throwing groove (11) in each pressure relief cavity (45).

3. The oil leakage prevention structure at a high speed rotor according to claim 2, characterized by, The pressure relief cavity (45) is provided with two, including first pressure relief cavity (45a) and second pressure relief cavity (45b), the first pressure relief cavity (45a) and the second pressure relief cavity (45b) are correspondingly provided with first oil return hole (47) and second oil return hole (48) communicated with the total oil return hole (21), and the oil throwing groove (11) includes first oil throwing groove (11a) arranged axially along the oil seal section (12) and located in the first pressure relief cavity (45a) and second oil throwing groove (11b) located in the second pressure relief cavity (45b).

4. The oil leakage prevention structure at a high-speed rotor according to claim 3, characterized by The sealing ring (40) includes first sealing ring (41), second sealing ring (42) and third sealing ring (43), the first sealing ring (41), the bearing (3) and the rotating shaft (1) form the oil return cavity (44) between, the first sealing ring (41), second sealing ring (42) and the oil seal section (12) form the first pressure relief cavity (45a) between, the second sealing ring (42), third sealing ring (43) and the oil seal section (12) form the second pressure relief cavity (45b) between.

5. The oil leakage prevention structure at a high-speed rotor according to claim 3, characterized by The radial depth of the first pressure relief cavity (45a) and / or the second pressure relief cavity (45b) is not less than 20mm.

6. The oil leakage prevention structure at a high speed rotor according to claim 1, wherein The outer end of the sealing ring (40) is sawtooth-shaped.

7. The oil leakage prevention structure at a high speed rotor according to claim 1, wherein The total oil return hole (21) is "V" shaped and has oil outlet (22) communicated with box inner cavity (24), the amount of oil entering the total oil return hole (21) reaches the bottom (23) of the oil outlet (22), can form oil storage bend structure to prevent oil mist in the box (2) from leaking outward.

8. The oil leakage prevention structure at a high speed rotor according to claim 7, characterized by, The total oil return hole (21) comprises a first hole section (21a) and a second hole section (21b) in communication, the first hole section (21a) is in communication with the oil return cavity (44), the first hole section (21a) extends to the end face of the box body (2) and forms the oil outlet (22), a height difference is formed between the upper part of the joint of the first hole section (21a) and the second hole section (21b) and the bottom (23) of the oil outlet (22) and an oil storage bend pressure head is formed.

9. The oil leakage prevention structure at a high speed rotor according to claim 8, characterized by, The axis of the first hole section (21a) is perpendicular to the axis of the rotating shaft (1).

10. The oil leakage prevention structure at a high speed rotor according to claim 8, characterized by The height difference is not less than 20 mm.

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