Longitudinal shaftless motor active oil-gas separator and automobile

Abstract

This invention provides a longitudinally mounted shaftless motor-driven active oil-gas separator and an automobile, belonging to the field of automotive component technology. It includes: a housing containing an outer chamber, an inner chamber, and a lower chamber; an air inlet on the inner chamber and an air outlet and a liquid outlet on the lower chamber; a stator assembly for generating a magnetic field; and a rotor assembly rotatably disposed in the inner chamber, with a through-slot on the rotor assembly having a diameter approximately equal to that of the air inlet. This invention integrates the oil-gas separation unit onto the rotor assembly, eliminating the shaft connection between the rotor assembly and the oil-gas separation unit. This reduces the axial dimensions of the oil-gas separator. Furthermore, since the diameter of the air inlet is approximately equal to the diameter of the through-slot, the intake volume of the oil-gas mixture per unit time is increased, thereby improving the oil-gas separation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, and relates to an oil-gas separator, particularly a longitudinally mounted shaftless 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 the prior art, an oil-gas separator includes a motor and an oil-gas separation structure connected to the motor's output shaft. The motor includes a stator and a rotor, wherein the rotor rotates around the output shaft. This is similar to an active oil-gas separator disclosed in patent application CN202010985386.1, which includes a housing, a separation device located at the lower part of the housing and equipped with a separation impeller and a separation filter ring, a stator mounted on the upper part of the housing, a rotor equipped with a drive shaft for driving the separation impeller to rotate, and a cooling impeller located below the rotor and connected to the drive shaft. The upper end of the drive shaft is pivotally connected to the upper end of the housing via an upper bearing, and the lower end of the drive shaft is pivotally connected to the lower end of the housing via a lower bearing. The rotor is provided with multiple axially distributed through holes along the circumference. The upper end of the housing is provided with at least one gas outlet through hole. The separation device is provided with several separation mechanisms distributed circumferentially around the outer side of the separation filter ring.

[0004] As is known from existing technology, because the motor and the oil-gas separation structure are separate components, the rotation of the oil-gas separation structure needs to be driven by the motor's output shaft to achieve centrifugal separation of oil and gas. Therefore, the oil-gas inlet can only be located on the cavity wall of the chamber containing the oil-gas separation structure, and the opening of this inlet cannot be too large, otherwise it will cause insufficient oil-gas separation. However, due to the small opening of the inlet, the oil-gas separation efficiency is low. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a longitudinally mounted shaftless motor-driven active oil-gas separator that can maximize the opening of the air inlet and improve oil-gas separation efficiency.

[0006] The objective of this invention can be achieved through the following technical solution: A longitudinally mounted shaftless motor-driven active oil-gas separator, comprising:

[0007] The shell is hollow. The internal space of the shell is divided into an upper chamber and a lower chamber along the axial direction by a first partition plate. The upper chamber is divided into an outer chamber and an inner chamber along the radial direction by a second partition plate. The outer chamber is not connected to the inner chamber or the lower chamber, while the inner chamber is connected to the lower chamber. The inner chamber is provided with an air inlet for the oil-gas mixture to enter, and the lower chamber is provided with an air outlet for the gas after separation and an oil outlet for the oil after separation on the cavity wall.

[0008] The stator assembly is installed in the outer cavity. When the stator assembly is energized, it generates a magnetic field, and the magnetic field lines can pass through the second partition plate and enter the inner cavity.

[0009] The rotor assembly is rotatably disposed in the inner cavity. A through groove is provided on the rotor assembly along the axial direction, and the through groove is connected to the air inlet and the lower cavity. The diameter of the through groove is approximately equal to the diameter of the air inlet, and the diameter of the through groove is positively correlated with the diameter of the air inlet. The diameter of the through groove is inversely correlated with the wall thickness of the rotor assembly. An oil-gas separation section for oil-gas separation is provided on the groove wall. The rotor assembly is driven by a magnetic field to rotate circumferentially in the inner cavity, and the oil-gas mixture entering through the air inlet is separated into oil and gas by the oil-gas separation section in the through groove.

[0010] In the aforementioned longitudinal shaftless motor active oil-gas separator, the two ports along the axial direction of the inner chamber are the first port and the second port, respectively. The first port is the air inlet, and the second port is connected to the lower chamber. The first port and the second port are narrowed to form abutment surfaces, namely the first abutment surface and the second abutment surface. The first abutment surface and the second abutment surface are arranged opposite to each other. The rotor assembly is located between the first abutment surface and the second abutment surface. The two ends of the rotor assembly along the axial direction are rotatably engaged with the first abutment surface and the second abutment surface, respectively. The axis of the rotor assembly is coaxial with the axis of the inner chamber.

[0011] In the aforementioned longitudinal shaftless motor active oil-gas separator, a first bearing and a second bearing are respectively provided between the two ends of the rotor assembly along the axial direction and the first abutment surface and the second abutment surface. Each of the first bearing and the second bearing is provided with a positioning part, a first abutment part, and a second abutment part. The positioning part on the first bearing and the second bearing is inserted into the first abutment surface and the second abutment surface, respectively. The first abutment part on the first bearing and the second bearing respectively contacts the end faces of the rotor assembly along the axial direction, so that axial friction is formed between the first abutment part and the end face of the rotor assembly. The second abutment part on the first bearing and the second bearing respectively contacts the groove wall at both ends of the through groove along the axial direction, so that radial friction is formed between the second abutment part and the groove wall of the through groove.

[0012] In the aforementioned longitudinal shaftless motor-driven oil-gas separator, both the first and second bearings are graphite bearings.

[0013] In the aforementioned longitudinal shaftless motor active oil-gas separator, both the first bearing and the second bearing include a first ring. A positioning part and a second abutting part are disposed at both ends of the first ring along the axial direction of the first ring. The second ring extends horizontally outward along the outer circumference of the first ring to form a second ring. The two sides of the second ring along the axial direction respectively contact the abutting surface and the end face of the rotor assembly to form a first abutting part. The first ring and the second ring are coaxially disposed, and the second ring is located between the positioning part and the second abutting part.

[0014] In the aforementioned longitudinal shaftless motor active oil-gas separator, the rotor assembly includes an impeller arranged in an annular shape, a through groove located on the impeller, and a first stepped portion and a second stepped portion respectively provided at both ends of the impeller along the axial direction. The first stepped portion and the second stepped portion are each provided with a first stepped surface and a second stepped surface. The first stepped surface contacts the first abutting portion, and the second stepped surface contacts the second abutting portion. Axial friction is formed between the first stepped surface and the first abutting portion, and radial friction is formed between the second stepped surface and the second stepped portion.

[0015] In the aforementioned longitudinal shaftless motor active oil-gas separator, the rotor assembly also includes multiple blades disposed on the impeller, and the multiple blades are distributed on the groove wall of the through groove, wherein the multiple blades constitute the oil-gas separation section.

[0016] In the above-mentioned longitudinal shaftless motor active oil-gas separator, multiple blades are divided into at least two groups of blades arranged vertically along the impeller axis. The blades in each group are distributed in a ring on the groove wall, and the blades in each group are on the same horizontal line.

[0017] In the above-mentioned longitudinal shaftless motor active oil-gas separator, there are two sets of blades, namely the first blade set and the second blade set. When the two sets of blades are projected onto the same plane, there is a blade from the second blade set between two adjacent blades in the first blade set, and there is a blade from the first blade set between two adjacent blades in the second blade set.

[0018] In the aforementioned longitudinal shaftless motor active oil-gas separator, the blades are arranged in an arc shape, and the bending direction of all blades in any group of blades is the same, as is the bending direction of all blades in any two adjacent groups of blades.

[0019] In the aforementioned longitudinal shaftless motor active oil-gas separator, the end of the blade connected to the groove wall is the connecting end, and the end opposite to the connecting end is the free end. When the blades in all the blade groups are projected onto the same horizontal plane, the center of the circle formed by splicing the free end faces of each blade is located on the axis of the impeller.

[0020] In the aforementioned longitudinal shaftless motor active oil-gas separator, multiple guide plates are provided on the wall of the lower chamber, and a guide groove is formed between two adjacent guide plates, with the multiple guide plates tilting in the same direction.

[0021] In the aforementioned longitudinal shaftless motor active oil-gas separator, the positions of multiple guide plates correspond to the positions of multiple blades in the second blade group and are located below the corresponding blades. The oil generated after separation by the second blade group enters the corresponding guide groove along the tangential direction of the corresponding blade.

[0022] In the above-mentioned longitudinal shaftless motor active oil-gas separator, multiple guide plates are divided into two groups along the axial direction of the lower chamber. The number of guide plates in each group is equal, and the positions of the guide plates in the two groups correspond one-to-one. The inclination angle of the guide groove formed between two adjacent guide plates in each group is consistent.

[0023] In the aforementioned longitudinal shaftless motor-driven oil-gas separator, the lower chamber is arranged in a stepped manner, and the lower chamber includes an upper chamber and a lower chamber arranged along the axial direction. A guide plate is arranged on the wall of the upper chamber, and an air outlet and a liquid outlet are arranged on the wall of the lower chamber.

[0024] In the aforementioned longitudinal shaftless motor-driven oil-gas separator, there is a height difference between the air outlet and the liquid outlet in the vertical direction. The distance between the plane where the air outlet is located and the plane where the air inlet is located is less than the distance between the plane where the liquid outlet is located and the plane where the air inlet is located.

[0025] In the aforementioned longitudinal shaftless motor-driven oil-gas separator, the oil-gas separator is modularly configured, and a connecting pipe is detachably connected to the air inlet of the oil-gas separator.

[0026] The present invention also provides an automobile, including the aforementioned longitudinally mounted shaftless motor active oil-gas separator.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The present invention provides a longitudinal shaftless motor active oil-gas separator. Since the oil-gas separation part is integrated on the rotor assembly, the rotation of the rotor assembly can drive the rotation of the oil-gas separation part, so that there is no shaft connection between the rotor assembly and the oil-gas separation part, thereby compressing the axial dimension of the oil-gas separator and reducing the volume of the entire oil-gas separator. In addition, since the diameter of the air inlet is comparable to the diameter of the through groove, and the diameter of the through groove is positively correlated with the diameter of the air inlet, and the diameter of the through groove is inversely correlated with the wall thickness of the rotor assembly, as long as the wall thickness of the rotor assembly is small enough, the diameter of the through groove and the diameter of the air inlet can be large enough, thereby increasing the intake volume of the oil-gas mixture per unit time and thus improving the oil-gas separation efficiency.

[0029] (2) Since the outer chamber and the inner chamber are not connected, the oil-gas mixture that enters the inner chamber for oil-gas separation will not enter the outer chamber after separation. Instead, it will flow directly into the lower chamber, thus ensuring the cleanliness of the outer chamber and improving the reliability of the stator assembly.

[0030] (3) The first and second bearings are made of graphite. Graphite has a layered crystal structure, which allows a thin film to form naturally on its surface during use, thereby reducing friction and wear. No additional lubricating oil or grease is needed, thus avoiding environmental pollution caused by leakage. In addition, graphite has good thermal conductivity, which can prevent local overheating. The heat generated by the friction between the rotor assembly and the graphite bearing during rotation can be dissipated in time, thereby improving the reliability of the oil-gas separator and extending its service life. Furthermore, the graphite bearing itself has a certain elastic modulus and vibration absorption capacity, which can effectively absorb vibration, reduce noise, and improve the stability and quietness of the oil-gas separator during operation. This vibration reduction and noise reduction effect is even more obvious when the rotor assembly forms bidirectional shaft-diameter friction with the graphite bearing during rotation.

[0031] (4) 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 channel can be contacted by the corresponding blades, thereby improving the oil-gas separation effect.

[0032] (5) The blades in the first blade group and the blades in the second blade group are spaced apart. This design increases the contact area between the blades and the oil-gas mixture. Moreover, the upper and lower blade groups do not interfere with each other, thereby improving the separation efficiency. In addition, each blade group can effectively separate the airflow once. As the number of layers increases, the separation effect gradually increases, which helps to remove droplets in the airflow more thoroughly and improve the overall separation efficiency.

[0033] (6) The curved blades can better guide the airflow in the predetermined direction, reducing turbulence and unnecessary energy loss. This helps maintain the stability and uniformity of the airflow, allowing the oil-gas mixture to pass through the oil-gas separation section more smoothly. In addition, the consistent curvature helps to form a more orderly airflow channel, making it easier for oil droplets or particles to be captured or settled, and making the airflow path more predictable. This is beneficial to improving the oil-gas separation effect, especially for the separation of fine particles or droplets;

[0034] (7) The center of the circle formed by splicing the free end faces of each blade is located on the axis of the impeller. This design ensures that the mass distribution of the blades is uniform during rotation, so that the center of gravity of the entire impeller coincides with the axis of rotation. This helps to reduce vibration and unbalanced forces, thereby extending the service life of the oil-gas separator and reducing noise. In addition, by optimizing the position of the free ends of the blades, the flow path and velocity distribution of the fluid (gas or liquid) can be better controlled, reducing energy loss and improving the working efficiency of the impeller.

[0035] (8) By setting a guide plate in the lower chamber, the oil-gas mixture can be separated by the oil-gas separation section, and the oil can flow along the guide groove along the wall of the lower chamber to the outlet, thus avoiding the accumulation of oil in the lower chamber and further improving the oil-gas separation efficiency.

[0036] (9) The oil can enter the guide groove more smoothly along the tangential direction of the corresponding blade, thereby reducing the generation of turbulence and helping to improve the separation effect. Moreover, the tangential introduction method helps to make the pressure distribution in the lower chamber more uniform and improves the stable operation of the entire system.

[0037] (10) The consistent inclination angle of the guide channels means that the fluid will be guided at a similar angle when passing through each pair of corresponding guide plates. This allows for better control of the direction and speed of the fluid, which is beneficial to improving separation efficiency. In addition, when the inclination angle of the guide channels is consistent, the fluid flow becomes more orderly and smooth, reducing unnecessary turbulence and frictional resistance, thereby reducing energy loss. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a longitudinally mounted shaftless motor active oil-gas separator according to the present invention.

[0039] Figure 2 yes Figure 1 The diagram shows a structural schematic of the oil-gas separator from another perspective.

[0040] Figure 3 yes Figure 2 The oil-gas separator shown is a cross-sectional view along section line AA.

[0041] Figure 4 This is a schematic diagram of the shell structure in a preferred embodiment of the present invention.

[0042] Figure 5 yes Figure 4 The diagram shows a structural schematic of the shell from another perspective.

[0043] Figure 6 yes Figure 5 The shown is a cross-sectional view of the housing along section line BB.

[0044] Figure 7 This is a schematic diagram of the rotor assembly in a preferred embodiment of the present invention.

[0045] Figure 8 yes Figure 7 The schematic diagram of the rotor assembly shown is from another perspective.

[0046] Figure 9 yes Figure 8 The rotor assembly shown is a cross-sectional view along the section line CC.

[0047] Figure 10 This is a schematic diagram of the stator assembly in a preferred embodiment of the present invention.

[0048] Figure 11 This is a schematic diagram of the structure of a second embodiment of a longitudinally mounted shaftless motor active oil-gas separator according to the present invention.

[0049] In the picture,

[0050] 100. Shell; 110. First partition plate; 120. Upper chamber; 121. Outer chamber; 122. Inner chamber; 123. Air inlet; 124. First contact surface; 125. Second contact surface; 130. Lower chamber; 131. Air outlet; 132. Liquid outlet; 133. Upper cavity; 134. Lower cavity; 140. Second partition plate; 150. Guide plate; 160. Guide groove;

[0051] 200. Stator assembly; 210. Electronic control PCB board; 220. Stator core; 230. Stator winding;

[0052] 300, Rotor assembly; 310, Through slot; 320, First bearing; 321, First ring; 3211, Positioning part; 3212, Second abutting part; 322, Second ring; 3221, First abutting part; 330, Second bearing; 340, Impeller; 341, First stepped part; 3411, First stepped surface; 3412, Second stepped surface; 342, Second stepped part; 350, Blade; 351, Connecting end; 352, Free end;

[0053] 400. Connecting pipe. 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] Example 1

[0057] like Figures 1 to 10 As shown, the present invention provides a longitudinally mounted shaftless motor-driven active oil-gas separator, comprising:

[0058] The housing 100 is hollow. The internal space of the housing 100 is divided into an upper chamber 120 and a lower chamber 130 along the axial direction by a first partition plate 110. The upper chamber 120 is divided into an outer chamber 121 and an inner chamber 122 along the radial direction by a second partition plate 140. The outer chamber 121 is not connected to the inner chamber 122 and the lower chamber 130, while the inner chamber 122 is connected to the lower chamber 130. The inner chamber 122 is provided with an air inlet 123 for the oil-gas mixture to enter. The lower chamber 130 is provided with an air outlet 131 for the gas to be discharged after separation and an oil outlet 132 for the oil to be discharged after separation.

[0059] The stator assembly 200 is installed in the outer cavity 121. When the stator assembly 200 is energized, it generates a magnetic field, and the magnetic field lines can pass through the second partition plate 140 and enter the inner cavity 122.

[0060] The rotor assembly 300 is rotatably disposed in the inner chamber 122. A through groove 310 is provided on the rotor assembly 300 along the axial direction, and the through groove 310 is connected to the air inlet 123 and the lower chamber 130. The diameter of the through groove 310 is approximately equal to the diameter of the air inlet 123, and the diameter of the through groove 310 is positively correlated with the diameter of the air inlet 123. The diameter of the through groove 310 is inversely correlated with the wall thickness of the rotor assembly 300. An oil-gas separation section for oil-gas separation is provided on the groove wall of the through groove 310. The rotor assembly 300 is driven by a magnetic field to rotate circumferentially in the inner chamber 122, and the oil-gas mixture entering through the air inlet 123 is separated into oil and gas by the oil-gas separation section in the through groove 310.

[0061] This invention provides a longitudinally mounted shaftless motor-driven active oil-gas separator. Since the oil-gas separation unit is integrated on the rotor assembly 300, the rotation of the rotor assembly 300 drives the rotation of the oil-gas separation unit, resulting in a shaftless connection between the rotor assembly 300 and the oil-gas separation unit. This reduces the axial dimensions of the oil-gas separator, thereby reducing the overall volume of the oil-gas separator. Furthermore, since the diameter of the air inlet 123 is comparable to the diameter of the through groove 310, and the diameter of the through groove 310 is positively correlated with the diameter of the air inlet 123, while the diameter of the through groove 310 is inversely correlated with the wall thickness of the rotor assembly 300, as long as the wall thickness of the rotor assembly 300 is sufficiently small, the diameters of the through groove 310 and the air inlet 123 can be sufficiently large, thereby increasing the intake volume of the oil-gas mixture per unit time and thus improving the oil-gas separation efficiency.

[0062] It is worth mentioning that the diameter of the through groove 310 is positively correlated with the diameter of the air inlet 123, meaning that when the diameter of the through groove 310 increases, the diameter of the air inlet 123 increases simultaneously; when the diameter of the through groove 310 decreases, the diameter of the air inlet 123 decreases simultaneously. The diameter of the through groove 310 is inversely correlated with the wall thickness of the rotor assembly 300, meaning that when the diameter of the through groove 310 increases, the wall thickness of the rotor assembly 300 decreases; when the diameter of the through groove 310 decreases, the wall thickness of the rotor assembly 300 increases.

[0063] In addition, since the outer chamber 121 and the inner chamber 122 are not connected, the oil-gas mixture that enters the inner chamber 122 for oil-gas separation will not enter the outer chamber 121 after separation. Instead, it will flow directly into the lower chamber 130, thereby ensuring the cleanliness of the outer chamber 121 and improving the reliability of the stator assembly 200.

[0064] More preferably, the inner chamber 122 has two ports along the axial direction, namely a first port and a second port. The first port is an air inlet 123, and the second port is connected to the lower chamber 130. The first port and the second port are narrowed to form abutment surfaces, namely a first abutment surface 124 and a second abutment surface 125. The first abutment surface 124 and the second abutment surface 125 are arranged opposite to each other. The rotor assembly 300 is located between the first abutment surface 124 and the second abutment surface 125. The two ends of the rotor assembly 300 along the axial direction are rotatably engaged with the first abutment surface 124 and the second abutment surface 125, respectively. The axis of the rotor assembly 300 is coaxial with the axis of the inner chamber 122.

[0065] More preferably, a first bearing 320 and a second bearing 330 are respectively disposed at both ends of the rotor assembly 300 along the axial direction between the first abutment surface 124 and the second abutment surface 125. Each of the first bearing 320 and the second bearing 330 is provided with a positioning part 3211, a first abutment part 3221, and a second abutment part 3212. The positioning part 3211 on the first bearing 320 and the second bearing 330 is inserted into and engaged with the first abutment surface 124 and the second abutment surface 125, respectively, to achieve the respective engagement of the first bearing 320 and the second bearing 330. Positioning and installation of the first abutment surface 124 and the second abutment surface 125; the first abutment portion 3221 on the first bearing 320 and the second bearing 330 respectively contacts the end faces of the rotor assembly 300 at both ends along the axial direction, so that axial friction is formed between the first abutment portion 3221 and the end face of the rotor assembly 300; the second abutment portion 3212 on the first bearing 320 and the second bearing 330 respectively contacts the groove wall at both ends along the axial direction of the through groove 310, so that radial friction is formed between the second abutment portion 3212 and the groove wall of the through groove 310.

[0066] It is worth mentioning that the first bearing 320 and the second bearing 330 are graphite bearings. Graphite has a layered crystal structure, which allows a thin film to naturally form on its surface during use, thereby reducing friction and wear. No additional lubricating oil or grease is needed, thus avoiding environmental pollution problems caused by leakage. In addition, graphite has good thermal conductivity, which can prevent local overheating. This allows the heat generated by the friction between the rotor assembly 300 and the graphite bearing during rotation to be dissipated in a timely manner, thereby improving the reliability of the oil-gas separator and extending its service life.

[0067] Furthermore, it is pointed out that graphite bearings have a certain elastic modulus and vibration absorption capacity, which can effectively absorb vibration, reduce noise, and improve the stability and quietness of the oil-gas separator during operation. In particular, when the rotor assembly 300 forms bidirectional shaft-diameter friction with the graphite bearing during rotation, this vibration reduction and noise reduction effect will be more obvious.

[0068] More preferably, the first bearing 320 and the second bearing 330 have the same structure. Both the first bearing 320 and the second bearing 330 include a first ring 321. The positioning part 3211 and the second abutting part 3212 are disposed at both ends of the first ring 321 along the axial direction of the first ring 321. The second ring 322 extends horizontally outward along the outer circumference of the first ring 321 to form a second ring 322. The two sides of the second ring 322 along the axial direction respectively contact the abutting surface and the end face of the rotor assembly 300 to form a first abutting part 3221. The first ring 321 and the second ring 322 are coaxially disposed, and the second ring 322 is located between the positioning part 3211 and the second abutting part 3212.

[0069] Preferably, the rotor assembly 300 includes an impeller 340 arranged in an annular shape, a through groove 310 located on the impeller 340, and a first stepped portion 341 and a second stepped portion 342 respectively provided at both ends of the impeller 340 along the axial direction. The first stepped portion 341 and the second stepped portion 342 are each provided with a first stepped surface 3411 and a second stepped surface 3412. The first stepped surface 3411 contacts the first abutting portion 3221, and the second stepped surface 3412 contacts the second abutting portion 3212. Axial friction is formed between the first stepped surface 3411 and the first abutting portion 3221, and radial friction is formed between the second stepped surface 3412 and the second stepped portion 342.

[0070] More preferably, the rotor assembly 300 further includes a plurality of blades 350 disposed on the impeller 340, and the plurality of blades 350 are distributed on the groove wall of the through groove 310, wherein the plurality of blades form an oil-gas separation section.

[0071] It is worth mentioning that the impeller 340 and the blade 350 are integrally injection molded, and the injection molding material is a polyolefin plastic. After the rotor assembly 300 is injection molded, perfluoropolyether is dipped into the surface of the rotor assembly 300 and treated with ultraviolet or ozone irradiation, so that the surface of the rotor assembly 300 has a low water contact angle and a high hexadecane contact angle, thereby achieving the oleophobicity of the rotor assembly 300.

[0072] 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:

[0073] 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.

[0074] 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.

[0075] Preferably, the multiple blades 350 are divided into at least two groups of blade groups arranged vertically along the axis of the impeller 340. The blades 350 in each group are distributed in a ring on the groove wall of the through groove 310, and the blades 350 in each group are on the same horizontal line.

[0076] In this embodiment, multiple blades 350 are grouped into multiple blade groups, and the multiple blade groups are distributed along the axial direction of the impeller 340, so that the oil-gas mixture in each area of ​​the channel 310 can be contacted by the corresponding blades 350, thereby improving the oil-gas separation effect.

[0077] More preferably, there are two sets of blades, namely a first set of blades and a second set of blades. The first set of blades is a set of blades close to the air inlet, and the second set of blades is a set of blades far from the air inlet. When the two sets of blades are projected onto the same plane, there is a blade 350 in the second set between two adjacent blades 350 in the first set, and there is a blade 350 in the first set between two adjacent blades 350 in the second set.

[0078] In this embodiment, the blades 350 in the first blade group and the blades 350 in the second blade group are spaced apart. This design increases the contact area between the blades 350 and the oil-gas mixture, and the upper and lower blade groups do not interfere with each other, thereby improving separation efficiency. Furthermore, each blade group can effectively separate the airflow once; as the number of layers increases, the separation effect gradually strengthens, helping to more thoroughly remove droplets from the airflow and improve overall separation efficiency.

[0079] More preferably, the blades 350 are arranged in an arc shape, and the bending direction of all blades 350 in any group of blades is the same, and the bending direction of all blades 350 in any two adjacent groups of blades is the same.

[0080] In this embodiment, the curved blades 350 can better guide the airflow in a predetermined direction, reducing turbulence and unnecessary energy loss. This helps maintain the stability and uniformity of the airflow, allowing the oil-gas mixture to pass through the oil-gas separation section more smoothly. Furthermore, the consistent curvature helps form a more orderly airflow channel, making it easier for oil droplets or particles to be captured or settled, and making the airflow path more predictable. This is beneficial for improving the oil-gas separation effect, especially for the separation of fine particles or droplets.

[0081] More preferably, one end of the blade 350 connected to the groove wall of the through groove 310 is the connecting end 351, and the other end opposite to the connecting end 351 is the free end 352. When the blades 350 in all the blade groups are projected onto the same horizontal plane, the center of the circle formed by splicing the end faces of the free ends 352 on each blade 350 is located on the axis of the impeller 340.

[0082] In this embodiment, the center of the circle formed by splicing the free ends 352 of each blade 350 is located on the axis of the impeller 340. This design ensures that the blades 350 have a uniform mass distribution during rotation, making the center of gravity of the entire impeller 340 coincide with the axis of rotation. This helps reduce vibration and unbalanced forces, thereby extending the service life of the oil-gas separator and reducing noise. In addition, by optimizing the position of the free ends 352 of the blades 350, the flow path and velocity distribution of the fluid (gas or liquid) can be better controlled, reducing energy loss and improving the working efficiency of the impeller 340.

[0083] Preferably, the stator assembly 200 includes:

[0084] The control unit includes an electronic control PCB board 210 and power and signal terminals electrically connected to the electronic control PCB board 210.

[0085] The stator unit includes a stator core 220 made of stacked silicon steel sheets and a stator winding 230 wound on the silicon steel sheets.

[0086] Preferably, a plurality of guide plates 150 are provided on the cavity wall of the lower chamber 130, a guide groove 160 is formed between two adjacent guide plates 150, and the multiple guide plates 150 are inclined in the same direction.

[0087] In this embodiment, by providing a guide plate 150 in the lower chamber 130, after the oil-gas mixture is separated by the oil-gas separation section, the oil can flow along the guide groove 160 along the cavity wall of the lower chamber 130 to the outlet 132, thus preventing the oil from accumulating in the lower chamber 130 and further improving the oil-gas separation efficiency.

[0088] More preferably, the positions of the plurality of guide plates 150 correspond to the positions of the plurality of blades 350 in the second blade group and are located below the corresponding blades 350, wherein the oil generated after separation by the second blade group enters the corresponding guide groove 160 along the tangential direction of the corresponding blade 350.

[0089] In this embodiment, the oil can enter the guide groove 160 more smoothly along the tangential direction of the corresponding blade 350, thereby reducing the generation of turbulence and helping to improve the separation effect. Moreover, the tangential introduction method helps to make the pressure distribution in the lower chamber 130 more uniform and improves the stable operation of the entire system.

[0090] More preferably, the multiple guide plates 150 are divided into two groups along the axial direction of the lower chamber 130. The number of guide plates 150 in each group is equal, and the positions of the guide plates 150 in the two groups correspond one-to-one. The inclination angle of the guide groove 160 formed between two adjacent guide plates 150 in each group is consistent.

[0091] In this embodiment, the consistent inclination angle of the guide channels 160 means that the fluid will be guided at a similar angle when passing through each pair of corresponding guide plates 150. This allows for better control of the fluid's direction and velocity, which is beneficial for improving separation efficiency. In addition, when the inclination angle of the guide channels 160 remains consistent, the fluid flow becomes more orderly and smooth, reducing unnecessary turbulence and frictional resistance, thereby reducing energy loss.

[0092] Preferably, the lower chamber 130 is arranged in a stepped manner, and the lower chamber 130 includes an upper chamber 133 and a lower chamber 134 arranged along the axial direction, wherein the guide plate 150 is disposed on the cavity wall of the upper chamber 133, and the air outlet 131 and the liquid outlet 132 are disposed on the cavity wall of the lower chamber 134.

[0093] More preferably, there is a height difference between the air outlet 131 and the liquid outlet 132 in the vertical direction, wherein the distance between the plane where the air outlet 131 is located and the plane where the air inlet 123 is located is less than the distance between the plane where the liquid outlet 132 is located and the plane where the air inlet 123 is located.

[0094] Example 2

[0095] like Figure 4 and Figure 11 As shown, compared with Embodiment 1, the difference in this embodiment is that in this Embodiment 2, the oil-gas separator in Embodiment 1 is used as a modular structure, and a connecting pipe 400 is connected to the air inlet 123. By changing the diameter, shape and other parameters of the connecting pipe 400, it can be matched with different equipment, thereby improving the flexibility of the oil-gas separator.

[0096] 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.

[0097] 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.

[0098] 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. A longitudinally mounted shaftless motor-driven active oil-gas separator, characterized in that, include: The shell is hollow. A first partition plate divides the internal space of the shell into an upper chamber and a lower chamber along the axial direction. A second partition plate divides the upper chamber into an outer chamber and an inner chamber along the radial direction. The outer chamber is not connected to the inner chamber or the lower chamber. The inner chamber is connected to the lower chamber. The inner chamber is provided with an air inlet for the oil-gas mixture to enter. The lower chamber is provided with an air outlet for the gas after separation and an oil outlet for the oil after separation on its wall. The stator assembly is installed in the outer cavity. When the stator assembly is energized, it generates a magnetic field, and the magnetic field lines can pass through the second partition plate and enter the inner cavity. A rotor assembly is rotatably disposed in the inner cavity. A through groove is provided on the rotor assembly along the axial direction, and the through groove is connected to the air inlet and the lower cavity. The diameter of the through groove is approximately equal to the diameter of the air inlet, and the diameter of the through groove is positively correlated with the diameter of the air inlet. The diameter of the through groove is inversely correlated with the wall thickness of the rotor assembly. An oil-gas separation section for oil-gas separation is provided on the groove wall. The rotor assembly is driven by a magnetic field to rotate circumferentially in the inner cavity, and the oil-gas mixture entering through the air inlet is separated into oil and gas by the oil-gas separation section in the through groove. The rotor assembly includes an impeller arranged in a ring, the through groove is located on the impeller, and the rotor assembly also includes a plurality of blades disposed on the impeller, and the plurality of blades are distributed on the groove wall of the through groove, wherein the plurality of blades constitute the oil-gas separation section; the plurality of blades are divided into at least two groups of blade groups arranged vertically along the impeller axis, the blades in each group of blades are arranged in a ring on the groove wall of the through groove, and the blades in each group of blades are on the same horizontal line; the number of blade groups is two, namely a first blade group and a second blade group, when the two groups of blade groups are projected onto the same plane, there is a blade from the second blade group between two adjacent blades in the first blade group, and there is a blade from the first blade group between two adjacent blades in the second blade group.

2. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 1, characterized in that, The inner chamber has two ports along its axial direction, namely a first port and a second port. The first port is an air inlet, and the second port is connected to the lower chamber. The first port and the second port are narrowed to form abutment surfaces, namely a first abutment surface and a second abutment surface. The first abutment surface and the second abutment surface are arranged opposite to each other. The rotor assembly is located between the first abutment surface and the second abutment surface. The two ends of the rotor assembly along its axial direction are rotatably engaged with the first abutment surface and the second abutment surface, respectively. The axis of the rotor assembly is coaxial with the axis of the inner chamber.

3. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 2, characterized in that, A first bearing and a second bearing are respectively disposed at both ends of the rotor assembly along the axial direction between the first abutment surface and the second abutment surface. Each of the first bearing and the second bearing is provided with a positioning part, a first abutment part, and a second abutment part. The positioning part on the first bearing and the second bearing is inserted into the first abutment surface and the second abutment surface, respectively. The first abutment part on the first bearing and the second bearing respectively contacts the end faces of both ends of the rotor assembly along the axial direction, so that axial friction is formed between the first abutment part and the end face of the rotor assembly. The second abutment part on the first bearing and the second bearing respectively contacts the groove wall at both ends of the through groove along the axial direction, so that radial friction is formed between the second abutment part and the groove wall of the through groove.

4. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 3, characterized in that, Both the first bearing and the second bearing are graphite bearings.

5. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 3, characterized in that, Both the first bearing and the second bearing include a first ring. The positioning part and the second abutting part are disposed at both ends of the first ring along the axial direction of the first ring. A second ring is formed by extending horizontally outward along the outer circumference of the first ring. The two sides of the second ring along the axial direction respectively contact the abutting surface and the end face of the rotor assembly to form a first abutting part. The first ring and the second ring are coaxially disposed, and the second ring is located between the positioning part and the second abutting part.

6. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 3, characterized in that, The impeller has a first stepped portion and a second stepped portion at both ends along the axial direction, and both the first stepped portion and the second stepped portion have a first stepped surface and a second stepped surface. The first stepped surface contacts the first abutting portion, and the second stepped surface contacts the second abutting portion. Axial friction is formed between the first stepped surface and the first abutting portion, and radial friction is formed between the second stepped surface and the second stepped portion.

7. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 1, characterized in that, The blades are arranged in an arc shape, and all blades in any group of blades have the same bending direction, as do all blades in any two adjacent groups of blades.

8. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 1, characterized in that, The end of the blade that is connected to the groove wall is the connecting end, and the end opposite to the connecting end is the free end. When all the blades in the blade group are projected onto the same horizontal plane, the center of the circle formed by splicing the free end faces of each blade is located on the axis of the impeller.

9. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 1, characterized in that, The lower chamber is provided with multiple guide plates on its cavity wall, and a guide groove is formed between two adjacent guide plates, and the multiple guide plates are tilted in the same direction.

10. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 9, characterized in that, The positions of the multiple guide plates correspond to the positions of the multiple blades in the second blade group and are located below the corresponding blades. The oil generated after separation by the second blade group enters the corresponding guide groove along the tangential direction of the corresponding blade.

11. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 9, characterized in that, The multiple guide plates are divided into two groups along the axial direction of the lower chamber. Each group has an equal number of guide plates, and the positions of the guide plates in the two groups correspond one-to-one. The inclination angle of the guide groove formed between two adjacent guide plates in each group is consistent.

12. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 9, characterized in that, The lower chamber is arranged in a stepped manner, and the lower chamber includes an upper chamber and a lower chamber arranged along the axial direction. The guide plate is disposed on the cavity wall of the upper chamber, and the air outlet and the liquid outlet are disposed on the cavity wall of the lower chamber.

13. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 12, characterized in that, There is a height difference between the air outlet and the liquid outlet in the vertical direction, wherein the distance between the plane where the air outlet is located and the plane where the air inlet is located is less than the distance between the plane where the liquid outlet is located and the plane where the air inlet is located.

14. The longitudinally mounted shaftless motor-driven active oil-gas separator according to claim 1, characterized in that, The oil-gas separator is modularly designed, and a connecting pipe is detachably connected to the air inlet of the oil-gas separator.

15. A car, characterized in that, Including the longitudinally mounted shaftless motor active oil-gas separator as described in any one of claims 1 to 14.

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