A main shaft assembly of an oil and gas separator

Abstract

The application discloses a main shaft assembly of an oil-gas separator, and the oil-gas separator comprises a stator assembly, and the main shaft assembly of the oil-gas separator comprises: a main shaft, both ends of the main shaft are equipped with bearings; a centrifugal separation assembly, the centrifugal separation assembly comprises a plurality of stacked and spaced centrifugal separation discs, the centrifugal separation discs are fixedly sleeved on the main shaft; a fixed shaft sleeve, the fixed shaft sleeve is formed with a penetrating assembly hole, the assembly hole is in interference fit with the main shaft, a rotor, the rotor is arranged on the radial outer side of the fixed shaft sleeve and is fixedly connected with the fixed shaft sleeve; the rotor is matched with the stator assembly, and the stator assembly is configured to drive the rotor to rotate and drive the fixed shaft sleeve and the main shaft to synchronously rotate. The main shaft assembly of the oil-gas separator provided by the application is simple to manufacture and low in production cost.

Description

Technical Field

[0001] This invention relates to the field of oil-gas separator technology, and particularly to a main shaft assembly for an oil-gas separator. Background Technology

[0002] Oil-gas separators are core purification components in engine crankcase ventilation systems, hydraulic systems, and pneumatic systems. They are primarily used to separate oil droplets, sludge particles, and air from the oil-gas mixture, effectively preventing environmental pollution caused by direct emissions of oily exhaust gases. They also prevent oil loss and engine carbon buildup, directly impacting equipment operational stability, service life, and exhaust emission compliance. Centrifugal oil-gas separators, with their compact structure, high separation efficiency, strong adaptability, and convenient maintenance, are widely used in automotive engines, industrial power equipment, and many other fields.

[0003] The core working component of a centrifugal oil-gas separator is a stacked array of centrifugal discs. A drive unit rotates multiple sets of discs at high speed. The powerful centrifugal force generated by this high-speed rotation forces denser oil droplets and oil mist particles in the oil-gas mixture to the sidewalls of the separation structure, where they converge and flow back. Clean gas is then discharged normally, thus achieving efficient separation of the oil and gas phases. Depending on the driving method, centrifugal oil-gas separators can be divided into passive and active types. Active oil-gas separators rely on an independent internal motor, are not limited by engine speed, and can maintain a stable rotational speed under various operating conditions. They offer superior oil-gas separation accuracy and adaptability to different operating conditions, and have become the mainstream application solution for high-end power equipment.

[0004] In active oil-gas separators, the drive unit is a motor. The centrifugal separation disc assembly is typically mounted on the main shaft of the motor's rotor assembly. The motor rotor is fixedly connected to the main shaft, and the stator assembly drives the rotor to rotate, thereby synchronously rotating the main shaft and the centrifugal separation disc assembly on the main shaft. In existing technologies, the rotor is usually directly fixed to the main shaft, such as by adhesive bonding. Furthermore, structures like grooves and protrusions need to be machined into the main shaft to prevent relative movement between the rotor and the main shaft. This design makes the main shaft difficult to machine and increases production costs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a main shaft assembly for an oil-gas separator that is simple to manufacture and has low production costs.

[0006] This invention is achieved through the following technical solution:

[0007] A spindle assembly for an oil-gas separator, the oil-gas separator including a stator assembly, the spindle assembly comprising:

[0008] The main shaft is equipped with bearings at both ends;

[0009] A centrifugal separation assembly, comprising a plurality of stacked and spaced-apart centrifugal separation discs, the centrifugal separation discs being fixedly sleeved on the main shaft;

[0010] A fixed bushing has a through mounting hole that is interference-fitted with the spindle.

[0011] A rotor, which is disposed radially outside the fixed bushing and fixedly connected to the fixed bushing;

[0012] The rotor cooperates with the stator assembly, which is configured to drive the rotor to rotate and cause the fixed bushing and the main shaft to rotate synchronously.

[0013] Furthermore, the rotor is an injection-molded magnet.

[0014] Furthermore, the rotor is integrally formed with the fixed bushing as an insert through an injection molding process to form a composite body.

[0015] Furthermore, the rotor includes two pairs of magnetic poles, each of which is arranged along the circumference of the rotor in the order of South Pole, North Pole, South Pole, North Pole.

[0016] Furthermore, a limiting boss is formed on the fixed bushing, and the lower end face of the rotor abuts against the limiting boss.

[0017] Furthermore, the rotor includes a plurality of magnets, which are alternately distributed around the fixed bushing in the circumferential direction, and the magnets are bonded and fixed to the fixed bushing.

[0018] Furthermore, the fixed bushing has a plurality of mounting grooves corresponding one-to-one with the plurality of magnets, and the magnets are at least partially accommodated in the mounting grooves.

[0019] Furthermore, the two opposite sides of the magnet respectively abut against the two third sidewalls that constitute the mounting groove.

[0020] Furthermore, the outer or inner side of the centrifugal separation disc is provided with a plurality of spacer ribs, the thickness of which is 0.1mm-0.5mm.

[0021] Furthermore, the centrifugal separation disc is a hollow frustum shape and includes a base plate, with a fixing hole formed at the midpoint of the base plate, and the fixing hole is fitted onto the main shaft.

[0022] Furthermore, there are gaps between adjacent centrifugal discs, and multiple connecting holes are formed on the base plate, with adjacent gaps connected through corresponding connecting holes.

[0023] Furthermore, the spacer includes a connecting portion formed on the base plate, and a plurality of connecting holes are arranged alternately around the circumference, with the connecting portions of the plurality of spacer near the fixed hole connected to each other.

[0024] Furthermore, the centrifugal separation disc includes a separation plate, and the spacer rib includes a flow guide portion, which is formed on the separation plate and connected to the connecting portion.

[0025] Furthermore, the guide portion is arc-shaped, and the bending direction of the guide portion is consistent with the rotation direction of the centrifugal separation disc.

[0026] Furthermore, the flow guide is inclined to the busbar of the separation plate along the rotation direction.

[0027] Compared with the prior art, the advantages of this invention are:

[0028] 1. By adding an independent fixed bushing, the fixing and limiting structure of the rotor is transferred to the fixed bushing. Compared with the longer spindle, the shorter fixed bushing has a simpler processing technology and lower forming difficulty, which greatly reduces the processing difficulty of the spindle and the overall processing cost of the spindle assembly.

[0029] 2. By setting spacer ribs evenly distributed in the circumferential direction on the centrifugal separation disc, the existing single gap in each layer is divided into multiple independent separation spaces. This avoids the problems of uneven airflow distribution in the circumferential direction in the single gap of the existing technology, which leads to airflow turbulence, low separation accuracy, high operating energy consumption and poor rotational stability. This effectively improves the separation efficiency, operating stability and separation accuracy of the oil-gas separator.

[0030] 3. By setting the guide section on the separation plate to an inclined and curved structure, it is ensured that the oil-gas mixture in the separation space can fully collide with the guide section, so that more oil mist and oil droplet particles adhere to the surface of the centrifugal separation disc, avoiding the problem of incomplete separation caused by the oil-gas mixture directly penetrating the gap, and significantly improving the separation accuracy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the main shaft assembly of the oil-gas separator according to Embodiment 1 of the present invention;

[0032] Figure 2 This is a partial exploded view of the spindle assembly according to Embodiment 1 of the present invention;

[0033] Figure 3 This is a cross-sectional view of the spindle assembly according to Embodiment 1 of the present invention;

[0034] Figure 4This is a partial structural schematic diagram of the centrifugal separation component according to Embodiment 1 of the present invention;

[0035] Figure 5 This is a three-dimensional sectional view of multiple centrifugal separation discs according to Embodiment 1 of the present invention;

[0036] Figure 6 for Figure 4 Enlarged view of section A in the middle;

[0037] Figure 7 for Figure 5 Enlarged view of section B;

[0038] Figure 8 This is a front view of the centrifugal separation disc according to Embodiment 1 of the present invention;

[0039] Figure 9 This is a partial structural schematic diagram of the spindle assembly according to Embodiment 1 of the present invention;

[0040] Figure 10 This is a schematic diagram of the main shaft assembly of the oil-gas separator according to Embodiment 2 of the present invention;

[0041] Figure 11 This is an exploded view of the rotor and bushing in Embodiment 2 of the present invention.

[0042] Explanation of reference numerals in the attached drawings: 1-Main shaft; 1a-Snap-fit ​​block; 4-Bearing; 2-Centrifugal separation assembly; 20-Centrifugal separation disc; 30, 30′-Fixed bushings; 300, 300′-Assembly holes; 31, 31′-Rotors; 301-Limiting boss; 310-Lower end face; 310′-Magnet; 311′-Mounting groove; 310a′-Side side; 311a′-Side wall; 21-Spacing rib; D-Thickness; 201-Base plate; 202-Separation plate; 203-Fixed hole; 203a-Snap-fit ​​part; 204-Connecting hole; 204a-First side wall; 22-Bottom cover; 220-Inlet; 23-Top cover; 24-Gap; 240-Separation space; 210-Connecting part; 210a-Second side wall; 211-Guide part; X-Rotation direction; L-Generatrix. Detailed Implementation

[0043] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0044] Example 1

[0045] like Figures 1 to 9 As shown, Embodiment 1 of the present invention provides a main shaft assembly for an oil-gas separator. The oil-gas separator includes a housing, within which a stator assembly and the aforementioned main shaft assembly are disposed. The main shaft assembly includes a main shaft 1 rotatably disposed within the housing and a centrifugal separation component 2 disposed on the main shaft 1. Furthermore, a rotor 31 is disposed on the main shaft 1. The stator assembly cooperates with the rotor 31. When the stator assembly is energized, it drives the rotor 31 to rotate, synchronously driving the main shaft 1 to rotate, which in turn drives the centrifugal separation component 2 to rotate synchronously. During the operation of the oil-gas separator, the oil-gas mixture enters the housing and flows into the centrifugal separation component 2. Under centrifugal force, oil droplets and oil mist particles are thrown against the side wall of the housing, collect, and flow out from the oil outlet at the bottom of the housing, while clean gas is discharged from the gas outlet at the top of the housing, achieving gas-liquid separation. It is worth noting that the main shaft assembly provided in this embodiment is simple to manufacture, effectively reducing equipment production and manufacturing costs.

[0046] For details, please refer to Figure 2 and Figure 3The spindle assembly includes a fixed bushing 30, with a rotor 31 disposed radially outside the fixed bushing 30 and fixedly connected to it. The fixed bushing 30 is then fixedly connected to the spindle 1, ultimately achieving the connection between the rotor 31 and the spindle 1. This invention abandons the traditional design approach where the rotor 31 is directly connected to the spindle 1, necessitating the machining of a limiting structure on the spindle 1. By adding an independent fixed bushing 30, the fixing and limiting structure of the rotor 31 is transferred to the fixed bushing 30. Compared to the longer spindle 1, the shorter fixed bushing 30 has a simpler machining process and lower forming difficulty, significantly reducing the machining difficulty of the spindle 1 and the overall machining cost of the spindle assembly.

[0047] In detail, in this embodiment, the rotor 31 uses an injection-molded magnet, which is integrally formed with the fixed bushing 30 as an insert through an injection molding process. This integral forming process can achieve a tight fit and fixation between the rotor 31 and the fixed bushing 30, completely eliminating problems such as relative rotation and axial displacement between the rotor 31 and the fixed bushing 30 during equipment operation, ensuring the assembly accuracy and connection stability between the rotor 31 and the fixed bushing 30. At the same time, a through-hole assembly hole 300 is formed on the fixed bushing 30, and the fixed bushing 30 is fixed to the main shaft 1 through the interference fit between the assembly hole 300 and the main shaft 1. The connection method is reliable and the assembly efficiency is high, which can improve the assembly efficiency of the main shaft assembly.

[0048] Preferably, in this embodiment, the rotor 31 includes two pairs of magnetic poles, with each magnetic pole arranged in the order of south pole, north pole, south pole, north pole along the circumference of the rotor 31. This magnetic pole arrangement ensures that the output speed of the rotor 31 meets the actual operating requirements of the oil-gas separator.

[0049] Optionally, refer to Figure 2 and Figure 3 A limiting boss 301 is formed on the fixed bushing 30. The lower end face 310 of the rotor 31 abuts against the limiting boss 301, further ensuring that the rotor 31 and the fixed bushing 30 will not have relative displacement due to equipment vibration or other reasons, which would cause the fixation of the two to fail.

[0050] In addition, we should focus on referring to Figure 3 The limiting boss 301 also has two annular process grooves 302, which are respectively set at both ends of the rotor 31 to provide dedicated process avoidance and molding space during the injection molding and magnetization process of the rotor 31. Specifically, the process grooves 302 can effectively improve the melt flow state during injection molding, avoid molding defects such as material shortage, bubbles, and deformation, and at the same time provide suitable working conditions for the magnetization operation of the rotor 31, effectively improving the injection molding quality and magnetization accuracy of the rotor 31, reducing the defect rate of parts processing, and improving the overall processing quality of the product.

[0051] In addition, combined Figure 1 In this embodiment, the centrifugal separation assembly 2 includes multiple centrifugal separation discs 20, which are stacked along the axial direction of the main shaft 1 and are all coaxially fixed to the main shaft 1. A gap 24 is formed between adjacent centrifugal separation discs 20, and a connecting hole 204 is formed in the middle of each centrifugal separation disc 20. Adjacent gaps 24 are connected through the connecting hole 204, thereby providing a channel for the separation of the oil-gas mixture. During the operation of the oil-gas separator, the oil-gas mixture passes through the connecting hole 204 along the airflow direction and enters the corresponding gap 24. A portion of the oil-gas mixture remains in the gap 24, while the other portion passes through the next connecting hole 204, and so on. Oil droplets, oil mist particles, and other substances adhere to the centrifugal separation discs 20 and are thrown towards the side wall of the housing under centrifugal force, collect, and flow out from the oil outlet at the bottom of the housing. Clean gas is discharged from the gas outlet at the top of the housing, achieving gas-liquid separation.

[0052] Further reference Figures 4 to 9 Multiple spacer ribs 21 are protruding on the inner or outer surface of the centrifugal separation disc 20. The spacer ribs 21 abut against the next centrifugal separation disc 20, thereby ensuring that there is a gap 24 between adjacent centrifugal separation discs 20. That is, the thickness D of the spacer ribs 21 is the width of the gap 24.

[0053] Furthermore, the spacer ribs 21 extend from the center of the centrifugal separation disc 20 to the edge. Multiple spacer ribs 21 on a centrifugal separation disc 20 are arranged in a divergent pattern, dividing the corresponding gap 24 circumferentially into multiple independent separation spaces 240. This optimized structural design, which divides the gap 24 into multiple independent separation spaces 240, confines the oil-gas mixture within a gap 24 to multiple separation spaces 240, thereby minimizing the problems of circumferential movement, local accumulation, and uneven distribution of the oil-gas mixture. This effectively suppresses turbulence within the gap 24, ensuring sufficient contact between the oil-gas mixture and the centrifugal separation disc 20, significantly improving the oil-gas separation effect. Reducing turbulence also reduces the impact on the rotation of the centrifugal separation disc 20, thereby reducing irregular resistance disturbances, lowering equipment vibration and speed fluctuations, and improving oil-gas separation efficiency.

[0054] As a preferred embodiment, the spacer ribs 21 are uniformly arranged on the inner side of the centrifugal separation disc 20.

[0055] Preferably, multiple spacer ribs 21 are evenly spaced around the main shaft 1 in the circumferential direction, thereby ensuring that multiple separation spaces 240 are evenly spaced in the circumferential direction. This further ensures that the airflow and flow resistance of each separation space 240 are consistent, achieving uniform distribution of oil-gas mixture in the circumferential direction of the gap 24. This avoids defects such as excessively fast local airflow and insufficient separation. At the same time, it ensures that the forces at each position are balanced during the rotation of the centrifugal separation disc 20, further reducing irregular resistance disturbances and lowering equipment operating vibration and speed fluctuations.

[0056] Furthermore, the centrifugal separator disc 20 has multiple connecting holes 204 as described above formed in its center. These connecting holes 204 and multiple spacer ribs 21 are alternately distributed around the main shaft 1 in the circumferential direction. Adjacent separation spaces 240 in the axial direction of the main shaft 1 are connected through the connecting holes 204. This structural arrangement can further ensure that the oil-gas mixture is uniformly introduced into each separation space 240, avoiding differences in the amount of oil-gas mixture in each separation space 240 caused by uneven air intake, and ensuring the consistency and stability of the separation operation.

[0057] In this embodiment, the centrifugal separator 20 is a hollow frustum shape and includes a base plate 201 and an inclined separator plate 202. A fixing hole 203 is formed through the midpoint of the base plate 201. The fixing hole 203 is fitted onto the main shaft 1 to achieve coaxial fixed assembly of the centrifugal separator 20 and the main shaft 1, ensuring coaxiality during rotation and avoiding vibration problems caused by eccentric rotation. The aforementioned multiple connecting holes 204 are formed on the base plate 201, and the multiple connecting holes 204 are evenly spaced around the fixing hole 203. The spacer ribs 21 include interconnected connecting parts 210 and guide parts 211, wherein the connecting parts 210 are formed on the base plate 201, and the connecting parts 210 of the multiple spacer ribs are interconnected at the ends near the fixing hole 203 to form an integral rib structure, realizing the closure and limitation of the center position of the gap 24, and preventing the oil-gas mixture from flowing out of the center position of the centrifugal separator 20.

[0058] Specifically, the guide section 211 is integrally formed on the surface of the separation plate 202 and smoothly connected to the connecting section 210, ensuring that the spacer rib 21 can stably abut against the next centrifugal separation disc 20, thereby ensuring the independence of multiple separation spaces 240 in the same gap 24. It is worth noting that the guide section 211 is designed with an arc shape, and the bending direction of the guide section 211 is consistent with the rotation direction X of the centrifugal separation disc 20. This structural design allows the oil-gas mixture in the separation space 240 to more fully collide with the guide section 211 during the rotation of the centrifugal separation disc 20, preventing some oil-gas mixture from being discharged before contacting the centrifugal separation disc 20 due to excessively high flow velocity, effectively improving the gas-liquid separation effect.

[0059] Furthermore, referring to Figure 8 The guide section 211 is inclined along the rotation direction X and set at the generatrix L of the separation plate 202. The inclined rib structure can change the flow angle of the oil-gas mixture, further ensuring that the oil-gas mixture in the separation space 240 can fully collide with the guide section 211, so that more oil mist and oil droplet particles adhere to the surface of the centrifugal separation disc 20, avoiding the problem of incomplete separation caused by the oil-gas mixture directly penetrating the gap 24, and significantly improving the separation accuracy.

[0060] Optionally, the thickness D of the spacer 21 is 0.1mm-0.5mm, preferably 0.3mm. This can avoid the problem that the residence time of the oil-gas mixture is too short due to the excessive width of the gap 24, which would prevent sufficient separation. It can also prevent the defects of airflow blockage and excessive rotational resistance caused by the excessive width of the gap 24, thus balancing the oil-gas separation efficiency and the smooth flow of the medium.

[0061] Further reference Figure 6 and Figure 7 The first sidewall 204a of the connecting hole 204 and the second sidewall 210a of the connecting part 210 are in the same plane. This structural arrangement can minimize the formation of a stepped structure between the connecting hole 204 and the spacer 21, which would cause eddies and turbulence when the oil-gas mixture flows through. This reduces airflow resistance and pressure loss, ensuring that the oil-gas mixture flows smoothly and steadily between the axial separation spaces 240, thereby improving the flow efficiency of the oil-gas mixture and thus improving the oil-gas separation efficiency.

[0062] In addition, refer to Figure 8 and Figure 9 The fixing hole 203 includes multiple snap-fit ​​parts 203a arranged in a circumferential array. Correspondingly, multiple snap-fit ​​blocks 1a are formed on the main shaft 1, which snap-fit ​​one-to-one with the multiple snap-fit ​​parts 203a. The snap-fit ​​structure between the snap-fit ​​block 1a and the corresponding snap-fit ​​part 203a realizes the circumferential positioning of the main shaft 1 and the centrifugal separation disc 20, and completely eliminates the phenomenon of relative rotation and slippage between the centrifugal separation disc 20 and the main shaft 1.

[0063] It is worth noting that the end of the connecting hole 204 near the fixing hole 203 is angled to accommodate the aforementioned snap-fit ​​part 203a, ensuring that the connecting hole 204 can be maximized, increasing the flow rate of the oil-gas mixture in the connecting hole 204, and improving the separation efficiency.

[0064] Furthermore, combined Figure 1 and Figure 9The centrifugal separation assembly 2 also includes a top cover 23 and a bottom cover 22. Both the bottom cover 22 and the top cover 23 are sleeved on the main shaft 1 and are respectively located at both ends of the multi-layer centrifugal separation discs 20. The bottom cover 22 is fixedly connected to the main shaft 1, while the top cover 23 is used to press the multi-layer centrifugal separation discs 20 together with the bottom cover 22, thus fixing all the centrifugal separation discs 20 axially and preventing axial movement or displacement of the centrifugal separation discs 20 during high-speed rotation, which would affect the relative independence of the separation space 240 and the separation accuracy. The bottom cover 22 has inlets 220 that communicate with multiple connecting holes 204, allowing the oil-gas mixture to flow into the multiple connecting holes 204.

[0065] In addition, combined Figure 1 and Figure 3 Both ends of the main shaft 1 are press-fitted with bearings 4, which are mounted inside the housing to achieve a rotatable connection between the main shaft 1 and the housing. A first spring 5 and a second spring 6 are also fitted onto the main shaft 1, each located at one end where the rotor 31 is mounted. The first spring 5 abuts against the bearing 4 and the bushing 31, while the second spring 6 abuts against the fixed bushing 31 and the top cover 23, providing force to the top cover 23 to ensure that the top cover 23 can apply a clamping force to the centrifugal separator disc 20. The structures of the bottom cover 22 and the top cover 23, as well as the connection method between the bottom cover, the top cover, and the main shaft 1, are all prior art and will not be elaborated upon further in this application.

[0066] Key reference Figure 3 The fixed bushing 30 has a tapered portion 303 near the end of the second spring 6. The tapered portion 303 gradually tapers along a straight line towards the second spring 6, forming an approximately conical shape. During assembly, the end of the second spring 6 can be fitted onto the tapered portion 303 and gradually spread out, thus fixing the second spring 6. A cylindrical portion 304 is also formed near the end of the tapered portion 303 to increase the strength of the end of the tapered portion 303. The cylindrical portion 304 has a chamfer to facilitate the assembly of the second spring 6.

[0067] Example 2

[0068] like Figure 10 and Figure 11 The image shows the main shaft assembly of the oil-gas separator provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the rotor 31′ in this embodiment is composed of multiple magnets 310′, which are alternately distributed around the fixed bushing 30′ in the circumference, and the magnets 310′ are bonded and fixed to the fixed bushing 30′.

[0069] Correspondingly, a plurality of mounting grooves 311' are formed on the fixed bushing 30', which correspond one-to-one with a plurality of magnets 310', and the magnets 310' are at least partially accommodated in the mounting grooves 311'.

[0070] Furthermore, the two opposing sides 310a' of the magnet 310' abut against the two third sidewalls 311a' that constitute the mounting groove 311'.

[0071] Similarly, the magnetic poles of multiple magnets 310', facing away from the main shaft 1, are arranged circumferentially along the main shaft 1 in the order of south pole, north pole, south pole, north pole. This magnetic pole arrangement ensures that the output speed of the rotor 31' meets the actual operating requirements of the oil-gas separator.

[0072] The main shaft assembly of the oil-gas separator provided by this invention, by adding independent fixed bushings 30 and 30', transfers the fixing and limiting structure of the rotors 31 and 31' to the fixed bushings 30 and 30'. Compared with the longer main shaft 1, the shorter fixed bushings 30 and 30' have simpler processing technology and lower forming difficulty, significantly reducing the processing difficulty of the main shaft 1 and the overall processing cost of the main shaft assembly. In addition, by setting the centrifugal separation discs 20 with circumferentially evenly distributed spacer ribs 21, the existing single gap 24 of each layer is divided into multiple independent separation spaces 240. This avoids the problems of uneven airflow distribution in the circumferential direction within a single gap 24 in the prior art, which leads to airflow turbulence, low separation accuracy, high operating energy consumption, and poor rotational stability, effectively improving the separation efficiency, operating stability, and separation accuracy of the oil-gas separator. Finally, by setting the guide section 211 on the separation plate 202 to an inclined and curved structure, it is ensured that the oil-gas mixture in the separation space 240 can fully collide with the guide section 211, so that more oil mist and oil droplet particles adhere to the surface of the centrifugal separation disc 20, avoiding the problem of incomplete separation caused by the oil-gas mixture directly penetrating the gap 24, and significantly improving the separation accuracy.

[0073] Furthermore, the above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A main shaft assembly for an oil-gas separator, the oil-gas separator comprising a stator assembly, characterized in that, The main shaft assembly of the oil-gas separator includes: Main shaft (1), both ends of which are equipped with bearings (4); Centrifugal separation assembly (2), the centrifugal separation assembly (2) includes a plurality of stacked and spaced centrifugal separation discs (20), the centrifugal separation discs (20) are fixedly sleeved on the main shaft (1); A fixed bushing (30, 30') is provided, on which through mounting holes (300, 300') are formed, and the mounting holes (300, 300') are interference-fitted with the main shaft (1). Rotors (31, 31') are disposed radially outside the fixed bushings (30, 30') and fixedly connected to the fixed bushings (30, 30'); The rotor (31, 31') cooperates with the stator assembly, which is configured to drive the rotor (31, 31') to rotate and drive the fixed bushing (30, 30') and the main shaft (1) to rotate synchronously.

2. The main shaft assembly of the oil-gas separator according to claim 1, characterized in that, The rotor (31) is an injection-molded magnet.

3. The main shaft assembly of the oil-gas separator according to claim 2, characterized in that, The rotor (31) is integrally formed with the fixed bushing (30) as an insert through injection molding process to form a composite body.

4. The main shaft assembly of the oil-gas separator according to claim 2, characterized in that, The rotor (31) includes two pairs of magnetic poles, each of which is arranged along the circumference of the rotor (31) in the order of South Pole, North Pole, South Pole, North Pole.

5. The main shaft assembly of the oil-gas separator according to claim 2, characterized in that, A limiting boss (301) is formed on the fixed bushing (30), and the lower end face (310) of the rotor (31) abuts against the limiting boss (301).

6. The main shaft assembly of the oil-gas separator according to claim 1, characterized in that, The rotor (31') includes a plurality of magnets (310'), which are alternately distributed around the fixed bushing (30') in the circumferential direction, and the magnets (310') are bonded and fixed to the fixed bushing (30').

7. The main shaft assembly of the oil-gas separator according to claim 6, characterized in that, The fixed bushing (30′) has a plurality of mounting grooves (311′) corresponding one-to-one with the plurality of magnets (310′), and the magnets (310′) are at least partially accommodated in the mounting grooves (311′); The two opposing sides (310a') of the magnet (310') abut against the two third sidewalls (311a') that constitute the mounting groove (311').

8. The main shaft assembly of the oil-gas separator according to claim 1, characterized in that, The centrifugal separation disc (20) has a plurality of spacer ribs (21) protruding on its outer side (20b) or inner side (20a), and the thickness (D) of the spacer ribs (21) is 0.1mm-0.5mm; The centrifugal separation disc (20) is hollow frustum-shaped and includes a base plate (201). A fixing hole (203) is formed at the midpoint of the base plate (201), and the fixing hole (203) is fitted onto the main shaft (1). There is a gap (23) between adjacent centrifugal separation discs (20), and a plurality of connecting holes (204) are formed on the base plate (201). The adjacent gaps (23) are connected through the corresponding connecting holes (204). The spacer rib (21) includes a connecting part (210), which is formed on the base plate (201). A plurality of connecting holes (204) are arranged alternately around the circumference. The connecting parts (210) of the plurality of spacer ribs (21) are connected to each other at one end near the fixing hole (203). The centrifugal separation disc (20) includes a separation plate (202), and the spacer rib (21) includes a flow guide (211), which is formed on the separation plate (202) and connected to the connecting part (210).

9. The main shaft assembly of the oil-gas separator according to claim 8, characterized in that, The guide section (211) is arc-shaped, and the bending direction of the guide section (211) is consistent with the rotation direction (X) of the centrifugal separation disc (20).

10. The main shaft assembly of the oil-gas separator according to claim 8, characterized in that, The flow guide (211) is inclined to the busbar (L) of the separation plate (202) along the rotation direction (X).

Images