An outer rotor motor active oil-gas separator and automobile

Abstract

This invention provides an active oil-gas separator with an external rotor motor and an automobile, belonging to the field of automotive component technology. It includes: a housing with an internal oil-gas separation chamber, an air inlet, an air outlet, a liquid outlet, and a receiving cavity, wherein the receiving cavity is not connected to the oil-gas separation chamber; a rotor located within the oil-gas separation chamber and nested with the cavity wall of the receiving cavity, wherein an oil-gas separation section is provided on the rotor; and a stator assembly embedded within the receiving cavity, with the axis of the stator assembly collinear with the axis of the rotor. This invention integrates the oil-gas separation section onto the rotor, achieving integration of the drive structure and the oil-gas separation structure. Furthermore, embedding the stator assembly into the housing creates a nested structure between the stator assembly and the rotor, thereby shortening the axial dimension of the oil-gas separator and achieving good oil-gas separation performance while reducing its size.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, and relates to an oil-gas separator, particularly an external rotor motor active oil-gas separator and an automobile. Background Technology

[0002] The oil-gas separator (also known as part of the crankcase ventilation system) is a critical component in an engine, primarily used to handle oil mist and exhaust gases generated during engine operation. When the engine is running, the high pressure inside the combustion chamber can force small amounts of gas through the piston rings into the crankcase, a phenomenon known as "blow-by." These gases contain unburned fuel, combustion products, and oil vapor, which, if left untreated, can adversely affect engine performance and the environment. The main function of the oil-gas separator is to separate the oil from other components in this mixture, allowing the clean gas to be reintroduced into the intake system for combustion, while the separated oil is returned to the engine lubrication system for reuse. This not only helps reduce oil consumption but also prevents harmful emissions from being directly released into the atmosphere, thus protecting the environment.

[0003] In existing technologies, oil-gas separation structures are driven by a motor and utilize centrifugal force to separate oil and gas. Both the motor and the separation structure have a certain volume, resulting in a relatively large oil-gas separator when combined. Therefore, to control the size of the oil-gas separator, two methods are often employed: reducing the size of the motor or the separation structure. Reducing the motor's size lowers its output power, affecting the separation efficiency, and also leads to poor heat dissipation. Reducing the separation structure's size decreases the contact area between the separation structure and the oil-gas mixture, further reducing the separation efficiency.

[0004] Therefore, whether it is by reducing the size of the motor or by reducing the size of the oil-gas separation structure, the oil-gas separation effect will be reduced. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an external rotor motor-driven active oil-gas separator that can maintain reliable oil-gas separation performance while reducing size.

[0006] The objective of this invention can be achieved through the following technical solution: an external rotor motor active oil-gas separator, comprising:

[0007] The housing has an internal oil-gas separation chamber, and the chamber wall of the oil-gas separation chamber is provided with an air inlet for the oil-gas mixture to enter, an air outlet for the separated gas to be discharged, and an oil outlet for the separated oil to be discharged. One side of the housing is a mounting plane, and a receiving cavity is formed by recessing inward along the mounting plane. The receiving cavity and the oil-gas separation chamber are located outside and inside the housing, respectively, and the two are not connected.

[0008] The rotor is located inside the oil-gas separation chamber and is nested with the cavity wall of the receiving chamber. The rotor can rotate circumferentially around the cavity wall of the receiving chamber. The rotor is provided with an oil-gas separation section for oil-gas separation.

[0009] The stator assembly is embedded in the receiving cavity, and the axis of the stator assembly is collinear with the axis of the rotor. When the stator assembly is energized, it generates a magnetic field that drives the rotor to rotate circumferentially around the cavity wall.

[0010] In the aforementioned external rotor motor active oil-gas separator, the stator assembly is modularly configured, and a stepped portion is provided on the outer circumferential surface of the stator assembly. When the stator assembly is embedded in the receiving cavity, the stepped portion abuts against the mounting plane.

[0011] In the aforementioned external rotor motor active oil-gas separator, the air inlet and air outlet are located on opposite sides of the housing, while the air outlet and liquid outlet are located on the same side of the housing and are arranged vertically.

[0012] In the aforementioned external rotor motor active oil-gas separator, the oil-gas mixture enters the oil-gas separation chamber from top to bottom through the air inlet, and the separated gas enters the air outlet from bottom to top through the oil-gas separation chamber. The separated oil is discharged from the liquid outlet along the wall of the oil-gas separation chamber. The opening direction of the air inlet is opposite to that of the air outlet, and the opening direction of the air outlet is perpendicular to that of the liquid outlet.

[0013] In the aforementioned external rotor motor active oil-gas separator, a baffle is provided on the side of the oil-gas separation chamber near the gas outlet or liquid outlet. One side of the baffle is connected to the side of the oil-gas separation chamber opposite to the bottom of the receiving chamber. A first gap is formed between the other side of the baffle and the side of the oil-gas separation chamber where the opening of the receiving chamber is located. A second gap is formed between the connecting wall between the gas outlet and the liquid outlet and the baffle. The separated gas flows to the gas outlet through the first gap and the second gap.

[0014] In the aforementioned external rotor motor active oil-gas separator, a connecting shaft that rotates with the rotor is connected to the back of the bottom of the receiving cavity or to the side of the oil-gas separation cavity opposite to the bottom of the receiving cavity. A bearing is provided at the point of rotational engagement between the rotor and the connecting shaft. Through the connecting shaft and the bearing, a third gap is formed between the rotor and the cavity wall of the receiving cavity, and between the rotor and the bottom of the receiving cavity.

[0015] In the aforementioned external rotor motor active oil-gas separator, the rotor includes an impeller, and the impeller is provided with an installation cavity that is nested and fitted with the cavity wall of the receiving cavity. The oil-gas separation section includes multiple blades, and the multiple blades are disposed on the outer circumferential surface of the impeller.

[0016] In the aforementioned external rotor motor active oil-gas separator, multiple blades are divided into at least two groups of blades arranged vertically along the rotor axis. The blades in each group are distributed in a ring on the outer circumference of the impeller, and the blades in each group are on the same horizontal line.

[0017] In the aforementioned external rotor motor active oil-gas separator, when all blade groups are projected onto the same plane, the projections of the blades at corresponding positions in each blade group overlap.

[0018] In the aforementioned external rotor motor active oil-gas separator, the blades in each blade group are of the same size, and the blades between adjacent blade groups are of different sizes. The projected area of ​​the blades near the cavity opening is larger than the projected area of ​​the blades near the cavity bottom.

[0019] In the aforementioned external rotor motor active oil-gas separator, the blades have an arc-shaped structure, and each blade has an equal width. The arc length of the blades closer to the cavity opening is greater than the arc length of the blades closer to the cavity bottom.

[0020] In the aforementioned external rotor motor active oil-gas separator, multiple oil-gas separation bars are provided on the cavity wall of the oil-gas separation chamber, and the multiple oil-gas separation bars are arranged in a ring. Each oil-gas separation bar protrudes from the cavity wall of the oil-gas separation chamber.

[0021] In the aforementioned external rotor motor active oil-gas separator, the oil-gas separation bars are arranged in a wavy shape.

[0022] In the aforementioned external rotor motor active oil-gas separator, the stator assembly includes:

[0023] A control unit, comprising an electronic control PCB board and power and signal terminals electrically connected to the electronic control PCB board;

[0024] The stator unit includes a stator core made of stacked silicon steel sheets and stator windings wound on the silicon steel sheets.

[0025] In the aforementioned external rotor motor active oil-gas separator, the stator assembly also includes:

[0026] The stator housing has a positioning shaft, and the stator core is nested on the positioning shaft. Multiple pads are distributed in a ring along the axial direction of the positioning shaft. The multiple pads are spliced ​​together to form the base plane of the electronic control PCB board, so that the electronic control PCB board does not contact the stator housing. The power and signal terminals are located outside the stator housing.

[0027] The present invention also provides an automobile, characterized in that it includes the aforementioned external rotor motor active oil-gas separator.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The present invention provides an active oil-gas separator for an external rotor motor. On the one hand, the oil-gas separation part is integrated on the rotor, realizing the integration of the drive structure and the oil-gas separation structure. On the other hand, the stator assembly is embedded in the housing, so that the stator assembly and the rotor form a nested structure, thereby shortening the size of the oil-gas separator in the axial direction, and thus achieving good oil-gas separation effect while reducing the volume.

[0030] (2) Since the stator assembly is embedded in the receiving cavity and the receiving cavity is not connected to the oil-gas separation cavity, the oil-gas mixture or the separated oil in the oil-gas separation cavity will not flow from the oil-gas separation cavity to the stator assembly through the receiving cavity, thereby ensuring that the surface of the stator assembly will not be attached to oil and ensuring the reliability of the stator assembly.

[0031] (3) The stator assembly is set as a modular structure in order to facilitate the replacement of the stator assembly. By replacing the stator assembly, the magnetic field strength formed by the stator assembly can be changed, thereby changing the output power of the rotor, so as to adapt to the purification of different oil-gas mixture concentrations and improve the flexibility of the oil-gas separator.

[0032] (4) By setting baffles, the gas outlet is isolated from the oil-gas separation chamber. On the one hand, the unseparated oil-gas mixture or the incompletely separated oil-gas mixture in the oil-gas separation chamber can be blocked in the oil-gas separation chamber, preventing it from being discharged directly from the gas outlet and improving the oil-gas separation effect. On the other hand, centrifugal oil-gas separation is achieved by the rotation of the rotor. The oil produced after separation will hit the baffle at a certain speed and then flow down along the baffle and be discharged from the liquid outlet through the first gap, preventing splashed oil from being discharged from the gas outlet and ensuring that the gas discharged from the gas outlet does not contain oil molecules. Thirdly, since a second gap is formed between the baffle and the connecting wall, the separated gas is in a "climbing" process when it flows from the first gap to the gas outlet. This not only reduces the gas flow rate and thus reduces the noise generated when the gas is discharged, but also, if the gas contains oil molecules during the climbing process, the oil molecules can also fall freely under the action of gravity, thereby further preventing oil molecules from being discharged from the gas outlet.

[0033] (5) By setting a third gap, it is ensured that the rotor does not contact the cavity wall of the receiving cavity when it is rotating in the circumferential direction or stationary, so that the rotor and the receiving cavity are nested and connected in a suspended position, avoiding frictional resistance between the two and improving the smoothness of rotor rotation.

[0034] (6) Multiple blades are grouped into multiple blade groups, and the multiple blade groups are distributed along the axis of the impeller, so that the oil-gas mixture in each area of ​​the oil-gas separation chamber can be contacted by the corresponding blades, thereby improving the oil-gas separation effect.

[0035] (7) The projections of the blades at corresponding positions in each blade group overlap, which ensures that the gas and liquid are evenly distributed across the entire cross-section of the separator. By making the blades of each layer overlap in projection, it is ensured that the airflow follows a similar flow path when passing through each layer of blades, thereby reducing the reduction in separation efficiency caused by uneven airflow. In addition, each layer of blades can effectively separate the airflow once, and the separation effect gradually increases with the number of layers. If the blades of each layer overlap in projection, then each layer can process the same airflow area, which helps to remove droplets from the airflow more thoroughly and improve the overall separation efficiency.

[0036] (8) Smaller blade groups are located in the upper layer of the impeller, providing higher local shear force and a finer airflow path. This helps capture smaller droplets, thereby improving the effective separation of fine droplets. Larger blade groups are located in the lower layer of the impeller, which can handle larger droplets and heavier droplets that have been initially separated in the upper layer, ensuring that droplets are not carried away by the gas again. In addition, by using blade groups of different sizes, the speed and direction of the airflow can be better controlled, making the gas flow smoother, reducing energy loss caused by turbulence, and also helping to prevent droplets from being re-entrained into the airflow.

[0037] (9) By setting raised oil-gas separation strips on the cavity wall of the oil-gas separation chamber, the contact area between the gas and the cavity wall is increased, which helps to capture droplets in the gas flow more effectively. More contact means that droplets have more opportunities to be intercepted by the cavity wall and flow down the wall surface, thus separating them from the gas flow. In addition, the raised oil-gas separation strips can disrupt the originally straight flow of the gas flow, causing it to generate local turbulence or vortices. This change in flow characteristics can help smaller droplets to collide more easily with the cavity wall or other droplets, and eventually coalesce into larger droplets, which are easier to separate, thereby improving the separation effect of the entire oil-gas separator;

[0038] (10) The wavy design of the oil-gas separator further increases the effective surface area of ​​the oil-gas separator, thereby increasing the chance of droplet capture and enhancing the separation effect. In addition, the wavy structure can induce the airflow to form more complex flow patterns, including local turbulence and vortices. These complex flows facilitate collisions between small droplets and between droplets and the surface of the separator, promoting droplet aggregation into larger droplets, which is convenient for subsequent gravity settling or capture. Moreover, within a limited space, the wavy design can provide more separation paths and contact points without increasing the size of the equipment, thereby improving the efficiency of the entire separation process. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an active oil-gas separator with an external rotor motor according to the present invention.

[0040] Figure 2 yes Figure 1 The diagram shows a structural schematic of the oil-gas separator from another perspective.

[0041] Figure 3 yes Figure 2 The oil-gas separator shown is a cross-sectional view along section line AA.

[0042] Figure 4 This is a schematic diagram of the shell structure in a preferred embodiment of the present invention.

[0043] Figure 5 yes Figure 4 The diagram shows a structural schematic of the shell from another perspective.

[0044] Figure 6 yes Figure 5 The shown is a cross-sectional view of the housing along section line BB.

[0045] Figure 7 This is a schematic diagram of the rotor structure in a preferred embodiment of the present invention.

[0046] Figure 8 yes Figure 7 The diagram shows the rotor from another perspective.

[0047] Figure 9 This is a schematic diagram of the stator assembly in a preferred embodiment of the present invention.

[0048] Figure 10 yes Figure 9 The stator assembly shown is a structural schematic diagram from another perspective.

[0049] Figure 11 yes Figure 10 The stator assembly shown is a cross-sectional view along the section line CC.

[0050] In the picture,

[0051] 100. Housing; 110. Oil-gas separation chamber; 120. Air inlet; 130. Air outlet; 140. Liquid outlet; 150. Mounting plane; 160. Receiving cavity; 170. Baffle; 171. First gap; 172. Second gap; 180. Connecting wall; 190. Connecting shaft; 1100. Oil-gas separation bar;

[0052] 200, Rotor; 210, Third clearance; 220, Impeller; 221, Mounting cavity; 230, Blade;

[0053] 300. Stator assembly; 310. Step section; 320. Electrical control PCB board; 330. Power and signal connection port; 340. Stator core; 350. Stator winding; 360. Stator housing; 370. Positioning shaft; 380. Spacer block. Detailed Implementation

[0054] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0056] like Figures 1 to 11 As shown, the present invention provides an active oil-gas separator with an external rotor motor, comprising:

[0057] The housing 100 has an internal oil-gas separation chamber 110. The chamber wall of the oil-gas separation chamber 110 is provided with an air inlet 120 for the oil-gas mixture to enter, an air outlet 130 for the separated gas to be discharged, and an oil outlet 140 for the separated oil to be discharged. One side surface of the housing 100 is a mounting plane 150. A receiving cavity 160 is formed by recessing inward along the mounting plane 150. The receiving cavity 160 and the oil-gas separation chamber 110 are located outside and inside the housing 100, respectively, and are not connected to each other.

[0058] The rotor 200 is located inside the oil-gas separation chamber 110 and is nested with the cavity wall of the receiving chamber 160. The rotor 200 can rotate circumferentially around the cavity wall of the receiving chamber 160. An oil-gas separation section for oil-gas separation is provided on the rotor 200.

[0059] The stator assembly 300 is embedded in the receiving cavity 160, and the axis of the stator assembly 300 is collinear with the axis of the rotor 200. When the stator assembly 300 is energized, it generates a magnetic field that drives the rotor 200 to rotate circumferentially around the cavity wall of the receiving cavity 160.

[0060] The present invention provides an active oil-gas separator for an external rotor motor. On the one hand, the oil-gas separation unit is integrated on the rotor 200, realizing the integration of the drive structure and the oil-gas separation structure. On the other hand, the stator assembly 300 is embedded in the housing 100, so that the stator assembly 300 and the rotor 200 form a nested structure, thereby shortening the size of the oil-gas separator in the axial direction, and thus achieving good oil-gas separation effect while reducing the volume.

[0061] In addition, since the stator assembly 300 is embedded in the receiving cavity 160 and the receiving cavity 160 is not connected to the oil-gas separation cavity 110, the oil-gas mixture or the separated oil in the oil-gas separation cavity 110 will not flow from the oil-gas separation cavity 110 to the stator assembly 300 through the receiving cavity 160, thereby ensuring that no oil adheres to the surface of the stator assembly 300 and ensuring the reliability of the stator assembly 300 in use.

[0062] Furthermore, the stator assembly 300 is modularly configured, and a stepped portion 310 is provided on the outer circumferential surface of the stator assembly 300. When the stator assembly 300 is embedded in the receiving cavity 160, the stepped portion 310 abuts against the mounting plane 150. The connection between the stepped portion 310 and the mounting plane 150 can be a fixed connection or a detachable connection.

[0063] It is worth mentioning that when the connection between the step portion 310 and the mounting surface 150 is a fixed connection, welding can be used to fix them together; when the connection between the step portion 310 and the mounting surface 150 is a detachable connection, a snap-fit ​​connection can be used.

[0064] In this embodiment, the stator assembly 300 is configured as a modular structure to facilitate its replacement. By replacing the stator assembly 300, the magnetic field strength generated by it can be changed, thereby altering the output power of the rotor 200. This allows for adaptation to the purification of different oil-gas mixture concentrations, improving the flexibility of the oil-gas separator. Therefore, a detachable connection is generally used between the stator assembly 300 and the housing 100.

[0065] Preferably, the outer wall of the housing 100 is provided with a first interface, a second interface, and a third interface that communicate with the oil-gas separation chamber 110. The first interface is an air inlet 120, the second interface is an air outlet 130, and the third interface is a liquid outlet 140. The air inlet 120 and the air outlet 130 are located on opposite sides of the housing 100, and the air outlet 130 and the liquid outlet 140 are located on the same side of the housing 100 and are arranged vertically.

[0066] It is worth mentioning that the oil-gas mixture enters the oil-gas separation chamber 110 from top to bottom through the air inlet 120, and the separated gas enters the air outlet 130 from bottom to top through the oil-gas separation chamber 110. The separated oil is discharged from the liquid outlet 140 along the wall of the oil-gas separation chamber 110. The opening direction of the air inlet 120 is opposite to that of the air outlet 130, and the opening direction of the air outlet 130 is perpendicular to that of the liquid outlet 140.

[0067] Preferably, a baffle 170 is provided in the oil-gas separation chamber 110 near the gas outlet 130 or the liquid outlet 140. One side of the baffle 170 is connected to the side of the oil-gas separation chamber 110 opposite to the bottom of the receiving chamber 160. The other side of the baffle 170 forms a first gap 171 between the side of the oil-gas separation chamber 110 and the opening of the receiving chamber 160. A second gap 172 is formed between the connecting wall 180 between the gas outlet 130 and the liquid outlet 140 and the baffle 170. The separated gas flows to the gas outlet 130 through the first gap 171 and the second gap 172.

[0068] In this embodiment, by setting a baffle 170, the outlet 130 is isolated from the oil-gas separation chamber 110. On the one hand, this can block unseparated or incompletely separated oil-gas mixtures in the oil-gas separation chamber 110, preventing them from being directly discharged from the outlet 130 and improving the oil-gas separation effect. On the other hand, centrifugal oil-gas separation is achieved by the rotation of the rotor 200. The oil produced after separation will impact the baffle 170 at a certain speed, then flow down the baffle 170, and be discharged from the liquid outlet 140 through the first gap 171. To prevent splashed oil from being discharged from the outlet 130, ensuring that the gas discharged from the outlet 130 does not contain oil molecules; thirdly, because a second gap 172 is formed between the baffle 170 and the connecting wall 180, the separated gas flows from the first gap 171 to the outlet 130 in a "climbing" process, which not only reduces the gas flow rate and thus reduces the noise generated when the gas is discharged, but also, if the gas contains oil molecules during the climbing process, the oil molecules can fall freely under the action of gravity, thereby further preventing oil molecules from being discharged from the outlet 130.

[0069] Preferably, the bottom back of the receiving cavity 160 is connected to a connecting shaft 190 that rotatably engages with the rotor 200, or the oil-gas separation cavity 110 is connected to a connecting shaft 190 that rotatably engages with the rotor 200 on the side opposite to the bottom of the receiving cavity 160, and a bearing is provided at the rotatable engagement point between the rotor 200 and the connecting shaft 190, so that a third gap 210 is formed between the rotor 200 and the cavity wall of the receiving cavity 160, and between the rotor 200 and the bottom of the receiving cavity 160, through the connecting shaft 190 and the bearing.

[0070] In this embodiment, by setting a third gap 210, it is ensured that the rotor 200 does not contact the cavity wall of the receiving cavity 160 when it is rotating circumferentially or stationary, so that the rotor 200 and the receiving cavity 160 are nested and connected in a suspended manner, avoiding frictional resistance between the two and improving the smoothness of the rotor 200 rotation.

[0071] Preferably, the rotor 200 includes an impeller 220, and an installation cavity 221 is provided on the impeller 220 to nest and cooperate with the cavity wall of the receiving cavity 160. The oil-gas separation section includes a plurality of blades 230, and the plurality of blades 230 are disposed on the outer circumferential surface of the impeller 220.

[0072] It is worth mentioning that the impeller 220 and the blade 230 are integrally injection molded. The injection molding material is polyolefin plastic. After the rotor 200 is injection molded, perfluoropolyether is dipped into the surface of the rotor 200 and treated with ultraviolet or ozone irradiation, so that the surface of the rotor 200 has a low water contact angle and a high hexadecane contact angle, thereby achieving the oleophobicity of the rotor 200.

[0073] Furthermore, it should be noted that both the water contact angle and the hexadecane contact angle are parameters used to describe the wettability of a liquid on a solid surface. They are evaluated by measuring the angle formed when a liquid droplet hits a solid surface. Specifically:

[0074] The water contact angle is the angle between the tangent at the gas-liquid interface and the solid surface at the solid-liquid-gas three-phase interface when a drop of water is placed on a solid surface. This angle reflects the strength of the interaction between water molecules and molecules on the solid surface. If the water contact angle is small (usually less than 90 degrees), it means that water can spread well on the solid surface, and such a surface is called hydrophilic. Conversely, if the water contact angle is large (greater than 90 degrees), it means that water does not spread easily on the solid surface, and such a surface is called hydrophobic.

[0075] Hexadecane is a nonpolar liquid with low surface tension, often used to characterize the interaction between solid surfaces and nonpolar or oily substances. The hexadecane contact angle is the angle between the tangent at the interface between the gas and hexadecane phases at the solid-liquid-gas three-phase interface when a drop of hexadecane is placed on a solid surface. The hexadecane contact angle is primarily used to assess the oleophobicity of solid surfaces. Because many hydrophobic surfaces are not oleophobic, using hexadecane as a probe liquid can better measure the anti-adhesion properties of solid surfaces to oily substances. n-Hexadecane is considered a standard probe liquid, with a contact angle of approximately 60°-80°, and can be used to characterize the oleophobicity of surfaces.

[0076] In addition, neodymium iron boron magnetic powder is bonded to the cavity wall of the mounting cavity 221 and used as the magnet of the rotor 200. The neodymium iron boron magnetic powder can be laid and bonded to the surface of the cavity wall of the mounting cavity 221, or the neodymium iron boron magnetic powder can be injected into the rotor 200.

[0077] Preferably, the multiple blades 230 are divided into at least two groups of blade groups arranged vertically along the axis of the rotor 200. The blades 230 in each group are distributed in a ring on the outer circumference of the impeller 220, and the blades 230 in each group are on the same horizontal line.

[0078] In this embodiment, multiple blades 230 are grouped into multiple blade groups, and the multiple blade groups are distributed along the axial direction of the impeller 220, so that the oil-gas mixture in each region of the oil-gas separation chamber 110 can be contacted by the corresponding blades 230, thereby improving the oil-gas separation effect.

[0079] More preferably, when all blade groups are projected onto the same plane, the projections of the blades 230 at corresponding positions in each blade group overlap.

[0080] In this embodiment, the projections of corresponding blades 230 in each blade group overlap, ensuring a uniform distribution of gas and liquid across the entire separator cross-section. By ensuring the projections of the blades 230 in each blade group overlap, the airflow follows a similar flow path as it passes through each blade group, reducing the reduction in separation efficiency caused by uneven airflow. Furthermore, each blade group effectively separates the airflow once, with the separation effect gradually increasing as the number of layers increases. If the blades 230 overlap in projection, each layer can process the same airflow area, helping to more thoroughly remove droplets from the airflow and improving overall separation efficiency.

[0081] More preferably, the blades 230 in each blade group are of the same size, and the blades 230 between adjacent blade groups are of different sizes. The projected area of ​​the blade 230 on the side closer to the cavity opening of the receiving cavity 160 is greater than the projected area of ​​the blade 230 on the side closer to the cavity bottom of the receiving cavity 160.

[0082] In this embodiment, the smaller blade assembly is located in the upper layer of the impeller 220, providing higher local shear force and a finer airflow path. This helps capture smaller droplets, thereby improving the effective separation of fine droplets. The larger blade assembly is located in the lower layer of the impeller 220, which can handle larger droplets and heavier droplets that have been initially separated in the upper layer, ensuring that droplets are not carried away by the gas again. In addition, by using blade assemblies of different sizes, the speed and direction of the airflow can be better controlled, resulting in smoother gas flow, reducing energy loss caused by turbulence, and also helping to prevent droplets from being re-entrained into the airflow.

[0083] More preferably, the blades 230 have an arc-shaped structure, and each blade 230 has an equal width, wherein the arc length of the blade 230 near the opening of the receiving cavity 160 is greater than the arc length of the blade 230 near the bottom of the receiving cavity 160.

[0084] Preferably, the oil-gas separation chamber 110 has multiple oil-gas separation strips 1100 on its chamber wall, and the multiple oil-gas separation strips 1100 are arranged in a ring, wherein each oil-gas separation strip 1100 protrudes from the chamber wall of the oil-gas separation chamber 110.

[0085] In this embodiment, by providing raised oil-gas separation strips 1100 on the cavity wall of the oil-gas separation chamber 110, the contact area between the gas and the cavity wall is increased, which helps to more effectively capture droplets in the airflow. More contact means that droplets have a greater chance of being intercepted by the cavity wall and flowing down the wall surface, thereby separating them from the airflow. In addition, the raised oil-gas separation strips 1100 can disrupt the originally straight-flowing airflow, causing it to generate local turbulence or vortices. This change in flow characteristics can help smaller droplets collide more easily with the cavity wall or other droplets, and eventually coalesce into larger droplets, facilitating separation and thus improving the separation effect of the entire oil-gas separator.

[0086] More preferably, the oil-gas separator 1100 is arranged in a wavy shape.

[0087] In this embodiment, the wavy oil-gas separation bar 1100 further increases its effective surface area, thereby improving the chance of droplet capture and enhancing the separation effect. Furthermore, the wavy structure can induce more complex flow patterns, including localized turbulence and vortices. These complex flows facilitate collisions between small droplets and between droplets and the separation bar surface, promoting droplet aggregation into larger droplets, which are then easier to collect or capture by gravity. Moreover, within a limited space, the wavy design can provide more separation paths and contact points without increasing the size of the equipment, thus improving the efficiency of the entire separation process.

[0088] Preferably, the stator assembly 300 includes:

[0089] The control unit includes an electronic control PCB board 320 and a power and signal connector 330 electrically connected to the electronic control PCB board 320.

[0090] The stator unit includes a stator core 340 made of stacked silicon steel sheets and a stator winding 350 wound on the silicon steel sheets.

[0091] More preferably, the stator assembly 300 includes:

[0092] The stator housing 360 has a positioning shaft 370 on it, and the stator core 340 is nested on the positioning shaft 370. Multiple pads 380 are distributed in a ring along the axial direction of the positioning shaft 370. The multiple pads 380 are spliced ​​to form the base plane of the electronic control PCB board 320, so that the electronic control PCB board 320 and the stator housing 360 do not contact each other. The power and signal wiring ports 330 are located outside the stator housing 360.

[0093] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, 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 terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0095] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An active oil-gas separator with an external rotor motor, characterized in that, include: The housing has an internal oil-gas separation chamber, and the chamber wall of the oil-gas separation chamber is provided with an air inlet for the oil-gas mixture to enter, an air outlet for the separated gas to be discharged, and an oil outlet for the separated oil to be discharged. One side surface of the housing is a mounting plane, and a receiving cavity is formed by recessing inward along the mounting plane. The receiving cavity and the oil-gas separation chamber are located outside and inside the housing, respectively, and are not connected to each other. The rotor is located inside the oil-gas separation chamber and is nested with the cavity wall of the receiving chamber. The rotor can rotate circumferentially around the cavity wall of the receiving chamber. The rotor is provided with an oil-gas separation section for oil-gas separation. A stator assembly is embedded in the receiving cavity, and the axis of the stator assembly is collinear with the axis of the rotor. When the stator assembly is energized, it generates a magnetic field that drives the rotor to rotate circumferentially around the cavity wall of the receiving cavity. The rotor includes an impeller, and the impeller is provided with a mounting cavity that is nested and fitted with the cavity wall of the receiving cavity. The oil-gas separation section includes multiple blades, and the multiple blades are disposed on the outer circumferential surface of the impeller. The multiple blades are divided into at least two groups of blade groups arranged vertically along the rotor axis. The blades in each group are distributed in a ring on the outer circumference of the impeller, and the blades in each group are on the same horizontal line. The blades in each blade group are of the same size, and the blades in adjacent blade groups are of different sizes. The projected area of ​​the blades on the side closer to the cavity opening of the receiving cavity is larger than the projected area of ​​the blades on the side closer to the cavity bottom of the receiving cavity.

2. The external rotor motor active oil-gas separator according to claim 1, characterized in that, The stator assembly is modularly configured, and a stepped portion is provided on the outer circumferential surface of the stator assembly. When the stator assembly is embedded in the receiving cavity, the stepped portion abuts against the mounting plane.

3. The external rotor motor active oil-gas separator according to claim 1, characterized in that, The air inlet and the air outlet are located on opposite sides of the housing, and the air outlet and the liquid outlet are located on the same side of the housing and are arranged vertically.

4. The external rotor motor active oil-gas separator according to claim 3, characterized in that, The oil-gas mixture enters the oil-gas separation chamber from top to bottom through the air inlet. The separated gas enters the air outlet from bottom to top through the oil-gas separation chamber. The separated oil is discharged from the liquid outlet along the wall of the oil-gas separation chamber. The opening direction of the air inlet is opposite to that of the air outlet, and the opening direction of the air outlet is perpendicular to that of the liquid outlet.

5. The external rotor motor active oil-gas separator according to claim 3, characterized in that, A baffle is provided in the oil-gas separation chamber near the gas outlet or liquid outlet. One side of the baffle is connected to the side of the oil-gas separation chamber opposite to the bottom of the receiving chamber. The other side of the baffle forms a first gap with the side of the oil-gas separation chamber where the opening of the receiving chamber is located. A second gap is formed between the connecting wall between the gas outlet and the liquid outlet and the baffle. The separated gas flows to the gas outlet through the first gap and the second gap.

6. The external rotor motor active oil-gas separator according to claim 1, characterized in that, A connecting shaft that rotates with the rotor is connected to the back of the cavity bottom of the receiving cavity or the side of the oil-gas separation cavity opposite to the cavity bottom of the receiving cavity. A bearing is provided at the rotational engagement point between the rotor and the connecting shaft. The connecting shaft and the bearing form a third gap between the rotor and the cavity wall of the receiving cavity, and between the rotor and the cavity bottom of the receiving cavity.

7. The external rotor motor active oil-gas separator according to claim 1, characterized in that, When all blade groups are projected onto the same plane, the projections of the blades at corresponding positions in each blade group overlap.

8. The external rotor motor active oil-gas separator according to claim 1, characterized in that, The blades are arc-shaped and each blade has the same width. The arc length of the blades closer to the cavity opening is greater than the arc length of the blades closer to the cavity bottom.

9. The external rotor motor active oil-gas separator according to claim 1, characterized in that, The oil-gas separation chamber has multiple oil-gas separation strips on its wall, and these multiple oil-gas separation strips are arranged in a ring. Each oil-gas separation strip protrudes from the wall of the oil-gas separation chamber.

10. The external rotor motor active oil-gas separator according to claim 9, characterized in that, The oil-gas separator bars are arranged in a wavy shape.

11. The external rotor motor active oil-gas separator according to claim 1, characterized in that, The stator assembly includes: A control unit, comprising an electronic control PCB board and power and signal terminals electrically connected to the electronic control PCB board; The stator unit includes a stator core made of stacked silicon steel sheets and stator windings wound on the silicon steel sheets.

12. The external rotor motor active oil-gas separator according to claim 11, characterized in that, The stator assembly also includes: The stator housing has a positioning shaft on it, and the stator core is nested on the positioning shaft. Multiple pads are arranged in a ring along the axial direction of the positioning shaft. The multiple pads are spliced ​​together to form the base plane of the electronic control PCB board, so that the electronic control PCB board and the stator housing do not contact each other. The power supply and signal connection ports are located outside the stator housing.

13. A car, characterized in that, Includes the external rotor motor active oil-gas separator as described in any one of claims 1 to 12.

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