A multi-nozzle centrifugal oil-gas separation device

Abstract

The present invention discloses a multi-nozzle centrifugal oil-gas separation device, comprising a first shell, a main shaft and a plurality of nozzles. A first cavity is provided in the first shell, and an oil return port connected to the first cavity is provided on the side wall of the first shell. The main shaft is partially rotatably provided in the first cavity, and a driving wheel is sleeved on the main shaft of this part. A plurality of nozzles are evenly spaced around the outer circumference of the driving wheel to jointly drive the driving wheel to rotate; or the main shaft is partially rotatably provided in the first cavity, and a plurality of driving wheels are sleeved on the main shaft of this part. At least one nozzle is provided on the outer circumference of each driving wheel to respectively drive the corresponding driving wheel to rotate in a balanced manner. The multi-nozzle centrifugal oil-gas separation device can ensure the rotation balance of the main shaft through the multi-nozzle drive mode, reduce the service life problem caused by bearing wear, and ensure the long-term continuous and stable operation of the separation component; it can also effectively reduce the starting speed of the crankcase and reduce engine fuel consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal separation, and in particular to a centrifugal oil-gas separation device with multiple nozzles. Background Art

[0002] The engine system of a car includes an engine, a turbocharger and an oil-gas separator. The oil-gas separator is connected to the engine's crankcase to separate the oil and gas mixture discharged from the engine. The oil flows back to the bottom of the engine's oil pan for reuse, and the gas is pressurized by the turbocharger or introduced into the engine's intake manifold and then returns to the engine's combustion chamber to perform work, thereby effectively preventing the unseparated oil-gas mixture from directly entering the atmosphere and causing pollution.

[0003] Chinese patent number CN103501916B discloses a technical solution that uses a single nozzle to drive an impact turbine to drive a centrifugal rotor to separate an oil-gas mixture. Although the purpose of oil-gas separation is achieved while minimizing transmission energy consumption, the single-nozzle drive structure is bound to destroy the dynamic balance rotation of the shaft and thus aggravate bearing wear, resulting in the rotor being unable to rotate reliably and stably, seriously affecting the oil-gas separation effect and its service life. Summary of the Invention

[0004] The object of the present invention is to provide a centrifugal oil-gas separation device with multiple nozzles, which is used to drive the main shaft to rotate in a balanced manner, thereby ensuring the service life and oil-gas separation effect of the centrifugal oil-gas separation device.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A multi-nozzle centrifugal oil-gas separation device, comprising:

[0007] A first housing, wherein a first cavity is provided in the first housing, and an oil return port communicating with the first cavity is provided on a side wall of the first housing;

[0008] A main shaft, part of which is rotatably disposed in the first cavity, and a driving wheel is sleeved on the main shaft of this part; and

[0009] A plurality of nozzles are evenly spaced around the periphery of the driving wheel to jointly drive the driving wheel to rotate.

[0010] A multi-nozzle centrifugal oil-gas separation device, comprising:

[0011] A first housing, wherein a first cavity is provided in the first housing, and an oil return port communicating with the first cavity is provided on a side wall of the first housing;

[0012] A main shaft, part of which is rotatably disposed in the first cavity, and a plurality of driving wheels are sleeved on the main shaft of this part; and

[0013] A plurality of nozzles, with at least one nozzle being provided on the periphery of each driving wheel, are used to drive the corresponding driving wheel to rotate in a balanced manner.

[0014] In an optional solution, a plurality of branch channels are provided inside the side wall of the first shell, one end of each branch channel converges outside the first shell to form a main channel, and the other end of each branch channel is connected to the corresponding nozzle, so that the flow rate of the fluid diverted from the main channel into each branch channel and ejected from the corresponding nozzle remains consistent.

[0015] In an optional solution, an oleophobic layer is provided on the inner wall of the main channel, the branch channel and / or the inner wall of the first shell.

[0016] In an optional scheme, it also includes a second shell and a separation component, the bottom of the second shell is provided with an oil and gas inlet, the inner wall of the second shell near the top is provided with an air outlet, the interior of the second shell is provided with a second cavity, the main shaft part is located in the second cavity and is rotatably connected to the second shell by providing an upper bearing and a lower bearing, the separation component is provided on the main shaft located in the second cavity, the separation component includes a plurality of stacked discs, and the oil and gas mixture input from the oil and gas inlet is separated under the action of the centrifugal force generated by the rotation of the separation component.

[0017] In an optional solution, a plurality of guide ribs are circumferentially spaced apart on the inner wall of the second shell. The guide ribs are of segmented structure, each of the guide ribs includes at least two disconnected rib segments, and the circumferentially adjacent rib segments are staggered up and down.

[0018] In an optional solution, the disc is a hollow frustum structure, and an annular throttling rib is provided on the outer side wall of the disc, and the throttling rib is a continuous or discontinuous structure.

[0019] In an optional solution, in the direction from top to bottom of the main shaft, the throttling effect of the throttling ribs of the disc on the oil-air mixture gradually decreases.

[0020] In an optional solution, the height of the throttle ribs of the disc decreases in the direction from top to bottom of the main shaft; or,

[0021] In the direction from top to bottom of the main shaft, the number of through holes on the throttling ribs of the disc gradually increases; or,

[0022] In the direction from top to bottom of the main shaft, the aperture of the through hole on the throttling rib of the disc gradually increases; or,

[0023] The throttling ribs are of discontinuous structure, and the spacing between the rib segments of the throttling ribs of the disc gradually increases in the direction from top to bottom of the main axis; or

[0024] In the direction from top to bottom of the main shaft, the number of the throttling ribs of the disc gradually decreases.

[0025] In an optional solution, a connector is provided at the oil and gas inlet and / or the gas outlet, and the connector is used to separate the gas in the oil and gas mixture.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] 1. The multi-nozzle drive mode can ensure the rotation balance of the main shaft, reduce the service life problems caused by bearing wear, and ensure the long-term continuous and stable operation of the separation component;

[0028] 2. It can also effectively reduce the starting speed of the crankcase and reduce engine fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a first driving structure of a multi-nozzle centrifugal oil-gas separation device according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of a second driving structure of a multi-nozzle centrifugal oil-gas separation device according to an embodiment of the present invention.

[0031] Figure 3 It is a schematic diagram of the connection structure between the first shell and the second shell of the centrifugal oil-gas separation device according to an embodiment of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the centrifugal oil-gas separation device corresponding to the second shell in an embodiment of the present invention.

[0033] Figure 5 yes Figure 4 Sectional view along line AA.

[0034] Figure 6 Schematic diagram of the structure of the separation component of an embodiment of the present invention.

[0035] Figure 7 2 is a structural schematic diagram of the second shell from another perspective of an embodiment of the present invention.

[0036] Figure 8 yes Figure 7 Cross-sectional view along line BB.

[0037] Figure 9 yes Figure 7Cross-sectional view along line CC.

[0038] In the figure: 1. first housing, 101. first chamber, 102. oil return port, 2. main shaft, 3. nozzle, 4. driving wheel, 5. second housing, 501. oil and gas inlet, 502. gas outlet, 503. second chamber, 6. upper bearing, 7. lower bearing, 8. disc, 9. guide rib, 10. throttling rib, 11. connector, 12. cyclone, 1201. Archimedean spiral flow channel, 1202. oil return hole, 13. impeller. DETAILED DESCRIPTION

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated descriptions thereof will be omitted.

[0040] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but can be modified as needed, and all such modifications are within the scope of protection of the present invention.

[0041] Example 1

[0042] See also Figure 1 As shown, the present invention provides a centrifugal oil-gas separation device with multiple nozzles 3 , comprising a first shell 1 , a main shaft 2 and multiple nozzles 3 .

[0043] A first cavity 101 is provided in the first housing 1 , and an oil return port 102 communicating with the first cavity 101 is provided on a side wall of the first housing 1 .

[0044] Part of the main shaft 2 is rotatably disposed in the first cavity 101 , and a driving wheel 4 is sleeved on this part of the main shaft 2 .

[0045] The plurality of nozzles 3 are evenly spaced around the periphery of the driving wheel 4 to jointly drive the driving wheel 4 to rotate.

[0046] The first housing 1 of this centrifugal oil-gas separation device is designed to dock with the engine's crankcase (not shown). Pressurized fluid (engine oil) is ejected from nozzles 3 to drive the drive wheel 4 on the main shaft 2, thereby rotating the main shaft 2 and controlling the separation assembly to separate the oil-gas mixture. To maintain balanced rotation of the main shaft 2, the aforementioned structure replaces the single-nozzle 3 drive mode with a multi-nozzle 3 drive mode. By installing multiple nozzles 3 evenly spaced circumferentially within the first housing 1, each nozzle 3 coordinates to control the rotation of the drive wheel 4, ensuring uniform force across all parts of the drive wheel 4. This ensures balanced and stable rotation of the main shaft 2, reducing wear on the upper and lower bearings 6 and 7, extending their service life, and ensuring the separation assembly maintains normal operating conditions for a long period of time, ensuring efficient oil-gas separation. Generally speaking, a greater number of nozzles 3 results in more balanced rotation of the main shaft 2. However, considering the volume of the first housing 1 and the installation of the nozzles 3, in this embodiment, two nozzles 3 are preferably arranged symmetrically about the center of the main shaft 2.

[0047] It's worth noting that the multi-nozzle 3 drive mode not only ensures balanced and stable rotation of the main shaft 2, but also effectively reduces the crankcase's starting speed. Specifically, if a single nozzle 3 is used, the crankcase requires a higher starting speed to boost the pressurized fluid and increase the jet intensity at the single nozzle 3. However, if multiple nozzles 3 are used, the crankcase only needs a relatively lower starting speed. Although the pressure of the pressurized fluid entering each nozzle 3 is reduced, the driving requirements can still be met through the multiple jets.

[0048] In a specific embodiment, a plurality of branch channels are provided inside the side wall of the first shell 1, one end of each branch channel converges outside the first shell 1 to form a main channel, and the other end of each branch channel is respectively connected to the corresponding nozzle 3, so that the flow rate of the fluid diverted from the main channel into each branch channel and ejected from the corresponding nozzle 3 remains consistent.

[0049] The above-mentioned built-in branch flow channel can avoid the need to set up a flow channel outside the shell, making the first shell 1 more simple and beautiful as a whole, and the flow channel is not easily damaged. The shared main flow channel is convenient for docking with the crankcase, and by controlling the flow rate of each branch flow channel, the consistency of the force at various locations on the drive wheel 4 can be effectively guaranteed, so that the main shaft 2 tends to rotate in a balanced manner.

[0050] In a preferred embodiment, an oleophobic layer is provided on the inner wall of the main channel, the branch channel and / or the inner wall of the first shell 1 .

[0051] By providing an oleophobic layer, it is possible to prevent oil from adhering to and accumulating on the main channel, branch channel, and / or the inner wall of the first housing 1 to form sludge, thereby affecting the oil return rate and effect. The oleophobic layer of this embodiment is preferably one of a polyolefin layer, a polycarbonate layer, a polyamide layer, a polyacrylonitrile layer, a fluorine-free acrylate layer, a molten paraffin layer, a perfluoropolyether layer, a polytetrafluoroethylene layer, a polyperfluoroethylene-propylene layer, a tetrafluoroethylene copolymer layer, a polyvinylidene fluoride layer, and a soluble tetrafluoroethylene layer. Oleophobic layers made of the above materials not only have a high oil return rate but also do not react with oil, providing long-term reliability.

[0052] See also Figure 4-6 As shown, in a specific embodiment, the centrifugal oil-gas separation device of the multi-nozzle 3 also includes a second shell 5 and a separation assembly, an oil-gas inlet 501 is provided at the bottom of the second shell 5, an air outlet 502 is provided on the inner wall of the second shell 5 near the top, a second cavity 503 is provided inside the second shell 5, the main shaft 2 is partially located in the second cavity 503 and is rotatably connected to the second shell 5 by providing an upper bearing 6 and a lower bearing 7, the separation assembly is provided on the main shaft 2 located in the second cavity 503, the separation assembly includes a plurality of stacked discs 8, and the oil-gas mixture input from the oil-gas inlet 501 is separated under the action of the centrifugal force generated by the rotation of the separation assembly.

[0053] In the above structure, the second shell 5 is arranged above the first shell 1, and the main shaft 2 extending from the first cavity 101 is rotatably mounted inside the second shell 5 through the upper bearing 6 and the lower bearing 7. The driving wheel 4 drives the separation component to rotate through the main shaft 2. The oil and gas mixture input from the oil and gas inlet 501 is separated into gas and oil under the centrifugal force of the separation device. The gas is discharged to the outside from the gas outlet 502, and the oil is thrown to the inner wall of the second shell 5 and flows to the inside of the first shell 1 under the action of gravity, and finally enters the crankcase from the oil return port 102.

[0054] Still see Figure 5 As shown, in a specific embodiment, a plurality of guide ribs 9 are circumferentially spaced apart on the inner wall of the second shell 5. The guide ribs 9 are segmented structures. Each guide rib 9 includes at least two disconnected rib segments, and circumferentially adjacent rib segments are staggered up and down.

[0055] By providing the guide ribs 9, their converging effect significantly increases the oil return rate. Specifically, after the oil is thrown onto the inner wall of the second housing 5, small oil particles agglomerate along the guide ribs 9, accelerating to form larger oil particles. Under the action of gravity, the oil is returned via a shorter path. Furthermore, the segmented guide ribs 9 can also reduce the pressure rise between the oil and gas inlet 501 and the gas outlet 502. Specifically, if the guide rib 9 is a continuous structure, the separated gas will all form a symmetry with the downstream oil when rising along the guide rib 9, which will lead to energy loss of the gas, and reduce the pressure rise of the oil and gas inlet 501 and the air outlet 502. The guide rib 9 of this embodiment is a segmented structure. When the gas rises along the guide rib 9, part of the gas and the oil are offset, and the remaining gas can avoid contact with the oil through the rib segment gaps of the guide rib 9, thereby effectively reducing the gas energy loss, avoiding the pressure rise of the oil and gas inlet 501 and the air outlet 502 from decreasing, and preventing the oil burning phenomenon caused by the negative pressure drop of the crankcase connected to the centrifugal oil and gas separation device from being aggravated.

[0056] See also Figure 6 As shown, in a specific embodiment, the disc 8 is a hollow frustum structure, and an annular throttling rib 10 is provided on the outer wall of the disc 8. The throttling rib 10 is a continuous or discontinuous structure.

[0057] By providing the throttle ribs 10 , the oil-gas mixture can be promoted to stay between the discs 8 and the collision probability with the oil-gas mixture can be increased, thereby improving the efficiency of oil-gas separation.

[0058] In a preferred embodiment, in the direction from top to bottom of the main shaft 2 , the throttling effect of the throttling ribs 10 of the disc 8 on the oil-air mixture gradually decreases.

[0059] From the vertical cross-sectional view of the separation component, the separation component has a large-caliber axial oil and gas flow channel and several thinner radial oil and gas flow channels. During the rotary separation process, the oil and gas mixture tends to concentrate in the upper area of ​​the separation component, which results in the lower area of ​​the separation component being unable to be effectively utilized and the separation efficiency is low. More specifically, under the action of flow inertia, the oil and gas mixture tends to flow outward through the gaps between the multiple discs 8 near the top, resulting in a large flow of the oil and gas mixture between the discs 8 near the top and a small flow of the oil and gas mixture between the discs 8 near the bottom, resulting in a prominent flow imbalance phenomenon, especially when the gaps between the discs 8 are large, the flow imbalance phenomenon is more obvious. The direct result of the flow imbalance is that the small droplets (about 1 μm) of oil in the oil and gas mixture between the discs 8 near the top have a shortened residence time on the discs 8, resulting in the small droplets being unable to agglomerate into large droplets, making it easier for the small droplets to be discharged from the centrifugal oil and gas separator with the gas, ultimately resulting in a decrease in separation efficiency.

[0060] This embodiment enhances the air flow capacity of the lower region of the separation assembly by designing the throttling ribs 10 so that their throttling effect on the oil-air mixture gradually decreases from top to bottom. This ultimately balances the air flow rates of the radial oil and gas flow passages at each layer, making the residence time of the oil-air mixture on each disc 8 uniform, thereby improving the utilization and separation efficiency of the separation assembly. This also prevents the upper region of the separation assembly from operating in a prolonged overloaded state, which could cause oil to form sludge on the discs 8 in the upper region and clog the radial oil and gas flow passages.

[0061] In order to gradually reduce the throttling effect of the separation component from top to bottom, the throttling rib 10 can be designed as follows:

[0062] In the direction from top to bottom of the main shaft 2, the height of the throttling rib 10 of the disc 8 gradually decreases; or, in the direction from top to bottom of the main shaft 2, the number of through holes on the throttling rib 10 of the disc 8 gradually increases; or, in the direction from top to bottom of the main shaft 2, the aperture of the through holes on the throttling rib 10 of the disc 8 gradually increases; or, the throttling rib 10 has a discontinuous structure, and in the direction from top to bottom of the main shaft 2, the spacing between each rib segment of the throttling rib 10 of the disc 8 gradually increases; or, in the direction from top to bottom of the main shaft 2, the number of the throttling rib 10 of the disc 8 gradually decreases.

[0063] The above-mentioned several throttling rib 10 schemes can gradually reduce the throttling effect of the separation component from top to bottom, thereby ensuring that the gas output of each radial oil and gas flow channel tends to be balanced and improving the utilization efficiency of the separation component.

[0064] See also Figure 8-9 As shown, in a specific embodiment, a connector 11 is provided at the oil and gas inlet 501 and / or the gas outlet 502 , and the connector 11 is used to separate the gas in the oil and gas mixture.

[0065] The connector 11 at the oil and gas inlet 501 is used for the initial filtration of the gas in the oil and gas mixture. Specifically, when the oil and gas mixture enters the oil and gas inlet 501, it will first collide with the connector 11. Part of the oil will agglomerate on the connector 11 here to form large-sized oil particles and then be separated, thereby playing the role of initial filtration of the gas in the oil and gas mixture. In this embodiment, the connector 11 located at the oil and gas inlet 501 is preferably an arc-shaped structure. While separating part of the oil, it can also guide the oil and gas mixture, allowing the oil and gas mixture to enter the separation component in a swirling manner, thereby improving the effect of subsequent oil and gas separation. The connector 11 at the air outlet 502 is used for the final filtration of the gas in the oil and gas mixture. Specifically, when the gas is discharged from the air outlet 502, the small amount of oil remaining in the gas will collide with the connector 11 here and agglomerate to form large-sized oil particles before being separated, thereby ensuring the purity of the discharged gas and reducing oil loss. In addition, the connectors 11 at the oil and gas inlet 501 and the air outlet 502 can also increase the flow rate of the oil and gas mixture, thereby increasing the pressure rise between the air outlet 502 and the oil and gas inlet 501. A higher pressure rise can ensure a higher negative pressure in the crankcase, and oil and gas are not easy to overflow, thereby having high reliability.

[0066] Still see Figure 5 、 Figure 8 As shown, in a specific embodiment, a cyclone 12 is provided between the oil and gas inlet 501 and the separation component. The cyclone 12 has an Archimedean spiral flow channel 1201 therein for pressurizing and enhancing the swirling effect of the oil and gas mixture entering the separation component.

[0067] By setting up the cyclone 12, the oil-gas mixture entering the cyclone 12 will collide with it and separate some oil. Among them, the Archimedean spiral flow channel 1201 in the cyclone 12 is used to guide the oil-gas mixture to enhance the swirl effect. The oil-gas mixture will enter the separation component in a more powerful swirling manner. After pressurization and enhanced swirl effect, better centrifugal separation effect can be obtained.

[0068] In a preferred embodiment, an oil return hole 1202 is provided at the bottom of the cyclone 12. The oil separated from the separation assembly and / or the cyclone 12 can flow through the oil return hole 1202 through the lower bearing 7 and then converge inside the first housing 1. This oil return hole 1202 can lubricate the lower bearing 7 during the oil return process, reducing bearing wear and extending its service life.

[0069] See also Figure 6-7 As shown, in a specific embodiment, an impeller 13 is further provided on the main shaft 2 located in the second cavity 503. The impeller 13 is located below the separation component to increase the pressure and enhance the swirling effect of the oil-gas mixture entering the separation component.

[0070] By providing impeller 13, when the main shaft 2 drives impeller 13 in high-speed rotation, impeller 13 collides with the oil-gas mixture, separating some of the oil. Simultaneously, it pressurizes and turbulents the oil-gas mixture, causing it to enter the separation assembly in a swirling manner, thereby achieving a better centrifugal separation effect. It should be noted that impeller 13 can also be installed independently below the separation assembly, or used in conjunction with cyclone 12 to achieve secondary pressurization and secondary enhanced swirl. Furthermore, the pressurization effect of impeller 13 can also increase the pressure rise between the air outlet 502 and the oil-gas inlet 501.

[0071] Example 2

[0072] See also Figure 2-3 As shown, the present invention further provides a centrifugal oil-gas separation device with multiple nozzles 3 , comprising a first housing 1 , a main shaft 2 and multiple nozzles 3 .

[0073] A first cavity 101 is provided in the first housing 1, and an oil return port 102 communicating with the first cavity 101 is provided on a side wall of the first housing 1;

[0074] The main shaft 2 is partially rotatably disposed in the first cavity 101, and a plurality of driving wheels 4 are sleeved on the main shaft 2 of this portion; and

[0075] At least one nozzle 3 is provided on the periphery of each driving wheel 4 to drive the corresponding driving wheel 4 to rotate in a balanced manner.

[0076] By adding drive wheels 4 and driving them in concert with corresponding nozzles 3, the aforementioned structure also enables the main shaft 2 to rotate in a balanced and stable manner, thereby reducing wear on the upper and lower bearings 6 and 7, extending their service life, and ensuring that the separation assembly remains in normal working order for a long time, thereby ensuring efficient oil-gas separation. In this embodiment, the number of drive wheels 4 is preferably two, disposed one above the other on the main shaft 2, and the number of nozzles 3 is preferably two, distributed on either side of the main shaft 2.

[0077] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes shall fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-nozzle centrifugal oil-gas separation device, characterized in that: include: A first housing, wherein a first cavity is provided in the first housing, and an oil return port communicating with the first cavity is provided on a side wall of the first housing; A main shaft, part of which is rotatably disposed in the first cavity, and a driving wheel is sleeved on the main shaft of this part; as well as a plurality of nozzles, the plurality of nozzles being evenly spaced around the outer circumference of the driving wheel and being used to jointly drive the driving wheel to rotate; a separation assembly comprising a plurality of stacked discs; The disc is a hollow truncated cone structure, and an annular throttling rib is provided on the outer wall of the disc. The throttling rib is a continuous or discontinuous structure; The height of the throttle ribs of the disc decreases in the direction from top to bottom of the main shaft; or, the number of through holes on the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the aperture of the through holes on the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the throttle ribs are discontinuous in structure, and the spacing between each rib segment of the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the number of the throttle ribs of the disc gradually decreases in the direction from top to bottom of the main shaft; In the direction from top to bottom of the main shaft, the throttling effect of the throttling ribs of the disc on the oil-gas mixture gradually decreases, and the direction from top to bottom of the main shaft is opposite to the gas flow direction.

2. A multi-nozzle centrifugal oil-gas separation device, characterized in that: include: A first housing, wherein a first cavity is provided in the first housing, and an oil return port communicating with the first cavity is provided on a side wall of the first housing; A main shaft, part of which is rotatably disposed in the first cavity, and a plurality of driving wheels are sleeved on the main shaft of the part; as well as A plurality of nozzles, at least one of which is provided on the periphery of each driving wheel, for driving the corresponding driving wheel to rotate in a balanced manner; a separation assembly comprising a plurality of stacked discs; The disc is a hollow truncated cone structure, and an annular throttling rib is provided on the outer wall of the disc. The throttling rib is a continuous or discontinuous structure; The height of the throttle ribs of the disc decreases in the direction from top to bottom of the main shaft; or, the number of through holes on the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the aperture of the through holes on the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the throttle ribs are discontinuous in structure, and the spacing between each rib segment of the throttle ribs of the disc gradually increases in the direction from top to bottom of the main shaft; or, the number of the throttle ribs of the disc gradually decreases in the direction from top to bottom of the main shaft; In the direction from top to bottom of the main shaft, the throttling effect of the throttling ribs of the disc on the oil-gas mixture gradually decreases, and the direction from top to bottom of the main shaft is opposite to the gas flow direction.

3. The multi-nozzle centrifugal oil-gas separation device according to claim 1 or 2, characterized in that: A plurality of branch channels are provided inside the side wall of the first shell, one end of each branch channel converges outside the first shell to form a main channel, and the other end of each branch channel is connected to the corresponding nozzle respectively, so that the flow rate of the fluid diverted from the main channel into each branch channel and ejected from the corresponding nozzle remains consistent.

4. The multi-nozzle centrifugal oil-gas separation device according to claim 3, characterized in that: An oleophobic layer is provided on the inner walls of the main channel, the branch channel and / or the inner wall of the first shell.

5. The multi-nozzle centrifugal oil-gas separation device according to claim 1 or 2, characterized in that: It also includes a second shell, an oil and gas inlet is provided at the bottom of the second shell, an air outlet is provided on the inner wall of the second shell near the top, a second cavity is provided inside the second shell, the main shaft part is located in the second cavity and is rotatably connected to the second shell by providing an upper bearing and a lower bearing, the separation component is provided on the main shaft located in the second cavity, the separation component includes a plurality of stacked discs, and the oil and gas mixture input from the oil and gas inlet is separated under the action of the centrifugal force generated by the rotation of the separation component.

6. The multi-nozzle centrifugal oil-gas separation device according to claim 5, characterized in that: The inner wall of the second shell is provided with a plurality of guide ribs at intervals in the circumferential direction. The guide ribs are of a segmented structure. Each guide rib includes at least two disconnected rib segments. The circumferentially adjacent rib segments are staggered up and down.

7. The multi-nozzle centrifugal oil-gas separation device according to claim 5, characterized in that: A connector is provided at the oil and gas inlet and / or the gas outlet, and the connector is used to separate the gas in the oil and gas mixture.

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