CN116255223A - Centrifugal oil-gas separation device with multiple nozzles - Google Patents

Abstract

The invention discloses a multi-nozzle centrifugal oil-gas separation device, which comprises a first shell, a main shaft and a plurality of nozzles, wherein a first containing cavity is arranged in the first shell, an oil return port communicated with the first containing cavity is arranged on the side wall of the first shell, the main shaft is arranged in the first containing cavity in a rotating way, a driving wheel is sleeved on the main shaft of the main shaft, and the plurality of nozzles are uniformly arranged at intervals around the periphery of the driving wheel and are used for jointly driving the driving wheel to rotate; or the main shaft part is rotatably arranged in the first accommodating cavity, the main shaft of the main shaft part is sleeved with a plurality of driving wheels, and the periphery of each driving wheel is provided with at least one nozzle for respectively driving the corresponding driving wheel to tend to rotate in a balanced manner. The multi-nozzle centrifugal oil-gas separation device can ensure the rotation balance of the main shaft through a multi-nozzle driving mode, reduce the service life problem caused by bearing abrasion, and ensure long-term continuous and stable operation of the separation assembly; the starting rotating speed of the crankcase can be effectively reduced, and the oil consumption of the engine is reduced.

Description

Centrifugal oil-gas separation device with multiple nozzles

Technical Field

The invention relates to the technical field of centrifugal separation, in particular to a multi-nozzle centrifugal oil-gas separation device.

Background

The engine system of the automobile comprises an engine, a turbocharger and an oil-gas separator, wherein the oil-gas separator is connected with a crankcase of the engine, oil and gas are separated from an oil-gas mixture discharged from the engine, the oil is returned to the bottom of an oil shell of the engine for reuse, and the gas is pressurized by the turbocharger or is led into an air inlet manifold of the engine and then returns to a combustion chamber of the engine for doing work, so that the oil-gas mixture which is not separated directly enters the atmosphere to cause pollution is effectively prevented.

The Chinese patent with the patent number of CN103501916B discloses a technical scheme of utilizing a single nozzle to drive an impact turbine to drive a centrifugal rotor to separate oil and gas mixtures, and although the aim of oil and gas separation is achieved on the premise of reducing transmission energy consumption as much as possible, the dynamic balance rotation of a shaft is damaged by a single nozzle driving structure, so that bearing abrasion is aggravated, the rotor cannot reliably and stably rotate, and the oil and gas separation effect and the service life of the oil and gas separation effect are seriously influenced.

Disclosure of Invention

The invention aims to provide a multi-nozzle centrifugal oil-gas separation device which is used for driving a main shaft to rotate in a balanced manner and guaranteeing the service life and the oil-gas separation effect of the centrifugal oil-gas separation device.

The invention adopts the following technical scheme:

a multi-nozzle centrifugal oil and gas separation device comprising:

the first shell is internally provided with a first containing cavity, and the side wall of the first shell is provided with an oil return port communicated with the first containing cavity;

the main shaft is partially rotatably arranged in the first accommodating cavity, and the driving wheel is sleeved on the main shaft of the part; and

the plurality of nozzles are uniformly arranged at intervals around the periphery of the driving wheel and are used for jointly driving the driving wheel to rotate.

A multi-nozzle centrifugal oil and gas separation device comprising:

the first shell is internally provided with a first containing cavity, and the side wall of the first shell is provided with an oil return port communicated with the first containing cavity;

the main shaft is partially rotatably arranged in the first accommodating cavity, and a plurality of driving wheels are sleeved on the main shaft of the part; and

and the periphery of each driving wheel is provided with at least one nozzle for respectively driving the corresponding driving wheel to rotate in a balanced manner.

In an alternative scheme, a plurality of branch flow passages are arranged in the side wall of the first shell, one end of each branch flow passage is converged outside the first shell to form a main flow passage, the other end of each branch flow passage is respectively connected with the corresponding nozzle, and the flow rate of fluid which is branched from the main flow passage into each branch flow passage and is emitted from the corresponding nozzle is kept consistent.

In an alternative solution, the inner walls of the main runner, the branch runner and/or the inner wall of the first housing are provided with oleophobic layers.

In an alternative scheme, still include second casing and separation subassembly, the bottom of second casing is provided with the oil gas import, be provided with the gas outlet on the inner wall near the top of second casing, the inside of second casing is provided with the second and holds the chamber, the main shaft part is located in the second holds the intracavity and through setting up upper bearing, lower bearing with second casing rotates to be connected, separation subassembly sets up on being located on the main shaft in the second holds the chamber, separation subassembly includes a plurality of discs that stack, follow the oil gas mixture of oil gas import is in separation is under the centrifugal force effect that separation subassembly rotation produced.

In an optional scheme, a plurality of guide ribs are arranged on the inner wall of the second shell at intervals in the circumferential direction, the guide ribs are of a sectional structure, each guide rib comprises at least two broken rib sections, and the rib sections adjacent in the circumferential direction are arranged in an up-and-down staggered mode.

In an alternative scheme, the disc is of a hollow round platform structure, an annular throttling rib is arranged on the outer side wall of the disc, and the throttling rib is of a continuous or discontinuous structure.

In an alternative, the throttle rib of the disc gradually reduces the throttle effect of the oil-gas mixture in the direction of the main shaft from top to bottom.

In an alternative, the throttle rib height assembly of the disc decreases in the top-to-bottom direction of the spindle; or,

in the direction from top to bottom of the main shaft, the number of through holes on the throttling rib of the disc is gradually increased; or,

in the direction from top to bottom of the main shaft, the aperture of the through hole on the throttling rib of the disc is gradually increased; or,

the throttling ribs are of discontinuous structures, and the intervals among rib sections of the throttling ribs of the disc gradually increase in the direction from top to bottom of the main shaft; or,

in the direction from top to bottom of the main shaft, the number of the throttle ribs of the disc gradually decreases.

In an alternative, a plug-in element is provided at the oil-gas inlet and/or at the gas outlet, said plug-in element being used for separating the gas in the oil-gas mixture.

Compared with the prior art, the invention has the beneficial effects that at least:

1. the multi-nozzle driving mode can ensure the rotation balance of the main shaft, reduce the service life problem caused by bearing abrasion and ensure the long-term continuous and stable operation of the separation assembly;

2. the starting rotating speed of the crankcase can be effectively reduced, and the oil consumption of the engine is reduced.

Drawings

FIG. 1 is a schematic illustration of a first drive configuration of a multi-nozzle centrifugal oil and gas separation device according to an embodiment of the invention.

FIG. 2 is a schematic illustration of a second drive configuration of a multi-nozzle centrifugal oil and gas separation device according to an embodiment of the invention.

FIG. 3 is a schematic diagram illustrating a connection structure between a first casing and a second casing of a centrifugal oil-gas separator according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a centrifugal oil-gas separation device corresponding to a second housing according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view taken along line A-A of fig. 4.

Fig. 6 is a schematic structural view of a separation assembly according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of the second housing according to another embodiment of the present invention.

Fig. 8 is a cross-sectional view taken along line B-B of fig. 7.

Fig. 9 is a cross-sectional view of fig. 7 taken along line C-C.

In the figure: 1. the device comprises a first shell, 101, a first containing cavity, 102, an oil return port, 2, a main shaft, 3, a nozzle, 4, a driving wheel, 5, a second shell, 501, an oil gas inlet, 502, an air outlet, 503, a second containing cavity, 6, an upper bearing, 7, a lower bearing, 8, a disc, 9, a flow guide rib, 10, a throttling rib, 11, a plug connector, 12, a cyclone, 1201, an Archimedean spiral runner, 1202, an oil return hole, 13 and an impeller.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied 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 concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.

The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention.

Example 1

Referring to fig. 1, the present invention provides a centrifugal oil-gas separation device with a plurality of nozzles 3, comprising a first housing 1, a main shaft 2 and a plurality of nozzles 3.

A first cavity 101 is arranged in the first shell 1, and an oil return port 102 communicated with the first cavity 101 is arranged on the side wall of the first shell 1.

The main shaft 2 is partially rotatably arranged in the first accommodating cavity 101, and the driving wheel 4 is sleeved on the main shaft 2 of the portion.

The plurality of nozzles 3 are arranged at regular intervals around the outer circumference of the driving wheel 4 for collectively driving the driving wheel 4 to rotate.

The first casing 1 of the centrifugal oil-gas separation device needs to be in butt joint with a crankcase (not shown) of an engine, and jet flow of pressure fluid (engine oil) from a nozzle 3 is utilized to drive a driving wheel 4 on a main shaft 2, so that the main shaft 2 can be driven to rotate, and further a separation assembly is controlled to separate an oil-gas mixture. In order to keep the balance rotation of the main shaft 2, the structure changes the single-nozzle 3 driving mode into the multi-nozzle 3 driving mode, and the nozzles 3 are arranged in the first shell 1 at a plurality of circumferentially uniform intervals, and the nozzles 3 cooperatively control the rotation of the driving wheel 4, so that the stress on each part of the driving wheel 4 is uniform, the main shaft 2 is ensured to rotate stably in a balanced manner, the abrasion between the main shaft 2 and the upper bearing 6 and the lower bearing 7 is reduced, the service life is prolonged, the separation assembly is in a normal working state for a long time, and the oil-gas separation efficiency is ensured. In general, the larger the number of nozzles 3, the more balanced the rotation of the main shaft 2, but considering the volume of the first housing 1, the installation of the nozzles 3, and the like, the number of nozzles 3 in the present embodiment is preferably two, and the two nozzles 3 are arranged symmetrically about the center of the main shaft 2.

It should be noted that, by adopting the multi-nozzle 3 driving mode, not only the balanced and stable rotation of the main shaft 2 can be ensured, but also the starting rotation speed of the crankcase can be effectively reduced. Specifically, if the single nozzle 3 is used for driving, the crankcase needs a larger starting rotation speed to boost the pressure fluid so as to improve the jet intensity at the single nozzle 3, and if the multi-nozzle 3 is used for driving, the crankcase only needs a relatively smaller starting rotation speed, and although the pressure of the pressure fluid entering each nozzle 3 is weakened, the driving requirement can be met through a plurality of jet flows.

In a specific embodiment, a plurality of branch flow passages are arranged in the side wall of the first shell 1, one end of each branch flow passage is converged outside the first shell 1 to form a main flow passage, the other end of each branch flow passage is respectively connected with the corresponding nozzle 3, and the flow rate of fluid which enters each branch flow passage in a split manner and is emitted from the corresponding nozzle 3 is kept consistent.

The built-in branch flow passages can avoid the flow passages outside the shell, so that the whole first shell 1 is more concise and attractive, the flow passages are not easy to damage, one common main flow passage is convenient to butt against the crankcase, and the consistency of stress on each part of the driving wheel 4 can be effectively ensured through the flow control of each branch flow passage, so that the main shaft 2 tends to rotate in a balanced manner.

In a preferred embodiment, the inner walls of the main runner, the branch runner and/or the inner wall of the first housing 1 are provided with oleophobic layers.

Through setting up the oleophobic layer, can avoid fluid to adhere to and accumulate on the inner wall of sprue, branch flow way and/or first casing 1 and form the fatlute, and then cause the influence to oil return rate and effect. The oleophobic layer of the 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 propylene layer, a tetrafluoroethylene copolymer layer, a polyvinylidene fluoride layer and a soluble tetrafluoroethylene layer, and the oleophobic layer of the above materials has high oil return rate, does not react with oil liquid, and has long-term reliability.

Referring to fig. 4 to 6, in a specific embodiment, the centrifugal oil-gas separation device of the multi-nozzle 3 further includes a second housing 5 and a separation assembly, the bottom of the second housing 5 is provided with an oil-gas inlet 501, an inner wall of the second housing 5 near the top is provided with an air outlet 502, the interior of the second housing 5 is provided with a second cavity 503, the spindle 2 is partially located in the second cavity 503 and is rotatably connected with the second housing 5 by providing an upper bearing 6 and a lower bearing 7, the separation assembly is disposed on the spindle 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 centrifugal force generated by rotation of the separation assembly.

In the above structure, the second housing 5 is disposed above the first housing 1, the main shaft 2 extending from the first cavity 101 is rotatably mounted in the second housing 5 through the upper bearing 6 and the lower bearing 7, the driving wheel 4 drives the separation assembly to rotate through the main shaft 2, the gas and oil in the separation position of the gas mixture input from the gas inlet 501 are separated under the centrifugal force of the separation device, the gas is discharged outwards from the gas outlet 502, and the oil is thrown to the inner wall of the second housing 5 and flows into the first housing 1 under the action of gravity, and finally enters the crankcase from the oil return port 102.

In a specific embodiment, as shown in fig. 5, a plurality of guide ribs 9 are circumferentially arranged on the inner wall of the second housing 5 at intervals, the guide ribs 9 are of a sectional structure, each guide rib 9 comprises at least two broken rib sections, and circumferentially adjacent rib sections are staggered up and down.

Through setting up water conservancy diversion muscle 9, utilize its confluence effect can improve the oil return rate by a wide margin, specifically speaking, after fluid is got rid of to the inner wall of second casing 5, the fluid of small diameter can be followed water conservancy diversion muscle 9 and gather the fluid that accelerates to form big diameter to return oil with the shorter route under the action of gravity. In addition, the segmented flow guiding rib 9 can solve the problem of pressure rise reduction of the oil gas inlet 501 and the gas outlet 502. Specifically, if the guide rib 9 is in a continuous structure, the separated gas will be symmetrical with the downflowing oil when rising along the guide rib 9, so as to cause energy loss of the gas, so that the pressure rise of the oil gas inlet 501 and the gas outlet 502 is reduced, while the guide rib 9 in this embodiment is in a sectional structure, when the gas rises along the guide rib 9, part of the gas forms a butt with the oil, and the rest of the gas can avoid contact with the oil through the rib section gap of the guide rib 9, so as to effectively reduce the energy loss of the gas, avoid the pressure rise of the oil gas inlet 501 and the gas outlet 502, and prevent the engine oil burning phenomenon aggravated by the negative pressure drop of the crankcase connected with the centrifugal oil gas separation device.

Referring to fig. 6, in a specific embodiment, the disc 8 has a hollow truncated cone structure, and an annular throttle rib 10 is disposed on an outer sidewall of the disc 8, where the throttle rib 10 has a continuous or discontinuous structure.

By providing the throttle rib 10, the oil-gas mixture can be promoted to stay between the discs 8, and the collision probability with the oil-gas mixture is improved, so that the oil-gas separation efficiency is improved.

In a preferred embodiment, the throttle rib 10 of the disk 8 has a gradually decreasing throttle effect on the oil-gas mixture in the direction of the spindle 2 from top to bottom.

From the vertical sectional view of the separation assembly, the separation assembly has an axial oil-gas flow passage with a larger caliber and a plurality of thinner radial oil-gas flow passages, and during the rotary separation process, the oil-gas mixture tends to be concentrated in the upper region of the separation assembly, which results in that the lower region of the separation assembly cannot be effectively utilized and the separation efficiency is low. More specifically, the oil-gas mixture tends to flow out through gaps between the discs 8 near the upper side due to the flow inertia effect, so that the flow rate of the oil-gas mixture between the discs 8 near the upper side is large, the flow rate of the oil-gas mixture between the discs 8 near the lower side is small, the flow imbalance phenomenon is obvious, especially when the gaps between the discs 8 are large, the flow imbalance phenomenon is more obvious, the residence time of small droplets (about 1 μm) of oil in the oil-gas mixture between the discs 8 near the upper side on the discs 8 is shortened, the small droplets cannot be agglomerated into large droplets, the small droplets are easier to discharge out of the centrifugal oil-gas separator along with gas, and finally the separation efficiency is reduced.

According to the embodiment, through designing the throttling rib 10, the throttling effect of the throttling rib 10 on the oil-gas mixture is gradually reduced from top to bottom, so that the gas outlet capacity of the lower layer area of the separation assembly is enhanced, the radial oil-gas flow passage gas outlet capacity of each layer is balanced, the residence time of the oil-gas mixture on each disc 8 is consistent, and the utilization efficiency and the separation efficiency of the separation assembly are improved. Meanwhile, the situation that the upper layer area of the separation assembly is in an overload running state for a long time, so that oil and sludge are formed on the disc 8 of the upper layer area to block the radial oil and gas flow passage is avoided.

In order to gradually reduce the throttling effect of the separating assembly from top to bottom, the throttle rib 10 may be designed as follows:

in the direction of the main shaft 2 from top to bottom, the height of the throttle rib 10 of the disc 8 is gradually reduced; alternatively, the number of through holes in the throttle rib 10 of the disc 8 increases gradually in the direction of the spindle 2 from top to bottom; alternatively, in the direction of the spindle 2 from top to bottom, the aperture of the through hole in the throttle rib 10 of the disc 8 gradually increases; alternatively, the throttle rib 10 is in a discontinuous structure, and the intervals between the rib sections of the throttle rib 10 of the disc 8 are gradually increased in the direction from top to bottom of the main shaft 2; alternatively, the number of throttle ribs 10 of the disk 8 gradually decreases in the direction of the spindle 2 from top to bottom.

The above-mentioned several schemes of the throttling ribs 10 can gradually reduce the throttling effect of the separation assembly from top to bottom, thereby ensuring that the air outlet quantity of each radial oil-gas flow passage tends to be balanced and improving the utilization efficiency of the separation assembly.

Referring to fig. 8-9, in one embodiment, a plug 11 is provided at the oil and gas inlet 501 and/or the gas outlet 502, the plug 11 being used to separate the gas from the oil and gas mixture.

The plug connector 11 at the oil-gas inlet 501 is used for primarily filtering gas in the oil-gas mixture, in particular, the oil-gas mixture enters from the oil-gas inlet 501 and can collide with the plug connector 11 first, part of oil can be aggregated on the plug connector 11 at the position to form large-particle-size oil and then separated, so that the effect of primarily filtering gas in the oil-gas mixture is achieved, the plug connector 11 at the oil-gas inlet 501 in the embodiment is preferably of an arc structure, and the oil-gas mixture can be guided while being separated, so that the oil-gas mixture enters into the separation assembly in a swirling manner, and the effect of subsequent oil-gas separation is improved. The plug connector 11 at the air outlet 502 is used for filtering the air in the air-oil mixture, specifically, when the air is discharged from the air outlet 502, a small amount of residual oil in the air collides with the plug connector 11 and is separated after the aggregation to form large-particle-size oil, so that the purity of the discharged air is ensured, and the engine oil loss is reduced. In addition, the plug connector 11 at the oil gas inlet 501 and the gas outlet 502 can increase the flow rate of the oil gas mixture, so that the pressure rise between the gas outlet 502 and the oil gas inlet 501 is improved, the pressure rise is higher, the negative pressure in the crankcase can be ensured to be larger, the oil liquid and the gas are not easy to overflow, and the reliability is high.

Referring also to fig. 5 and 8, in one embodiment, a cyclone barrel 12 is disposed between the oil gas inlet 501 and the separation assembly, and an archimedes spiral flow passage 1201 is provided in the cyclone barrel 12 to boost and enhance the swirling action of the oil gas mixture entering the separation assembly.

Through setting up the whirlwind section of thick bamboo 12, the oil gas mixture that gets into in the whirlwind section of thick bamboo 12 can collide with it, separates partial fluid, and wherein, the archimedes spiral runner 1201 in the whirlwind section of thick bamboo 12 is used for carrying out water conservancy diversion to oil gas mixture in order to strengthen the whirlwind effect, and oil gas mixture can get into the separation subassembly department with the mode of more powerful whirlwind, after pressure boost and reinforcing whirlwind effect, can obtain better centrifugal separation effect.

In a preferred embodiment, the bottom of the cyclone barrel 12 is provided with an oil return hole 1202, and the oil separated from the separation assembly and/or the cyclone barrel 12 can be gathered in the first housing 1 after flowing through the lower bearing 7 from the oil return hole 1202. The oil return hole 1202 can lubricate the lower bearing 7 during oil return, so that the abrasion of the bearing is reduced and the service life is prolonged.

Referring to fig. 6-7, in one embodiment, an impeller 13 is further disposed on the main shaft 2 within the second cavity 503, and the impeller 13 is disposed below the separation assembly to boost and enhance the swirling action of the oil-gas mixture entering the separation assembly.

Through setting up impeller 13, main shaft 2 is when driving impeller 13 high-speed rotation, and impeller 13 can collide with the oil gas mixture and separate out partial fluid, carries out pressure boost and vortex to the oil gas mixture simultaneously, makes it get into the separation subassembly department with the mode of beating the spiral to obtain better centrifugal separation effect. It should be noted that, the impeller 13 is also separately installed below the separation assembly, and may be also used in combination with the cyclone barrel 12 to perform the effects of secondary pressurization and secondary cyclone enhancement. In addition, the pressurization of impeller 13 may also increase the pressure rise between outlet 502 and oil and gas inlet 501.

Example 2

Referring to fig. 2-3, the present invention also provides a centrifugal oil-gas separation device with multiple nozzles 3, comprising a first housing 1, a main shaft 2 and multiple nozzles 3.

A first containing cavity 101 is arranged in the first shell 1, and an oil return port 102 communicated with the first containing cavity 101 is arranged on the side wall of the first shell 1;

the main shaft 2 is partially rotatably arranged in the first accommodating cavity 101, and a plurality of driving wheels 4 are sleeved on the main shaft 2 of the portion; and

the outer circumference of each driving wheel 4 is provided with at least one nozzle 3 for driving the corresponding driving wheel 4, respectively, to rotate in a balanced manner.

The structure can lead the main shaft 2 to trend to balance and stably rotate through additionally arranging the driving wheel 4 and cooperatively driving the driving wheel by the corresponding nozzle 3 so as to reduce the abrasion with the upper bearing 6 and the lower bearing 7, prolong the service life, lead the separation assembly to be in a normal working state for a long time and ensure the oil-gas separation efficiency. In this embodiment, the number of driving wheels 4 is preferably two, and the driving wheels are disposed on the main shaft 2 up and down, and the number of nozzles 3 is preferably two, and the two nozzles 3 are distributed on two sides of the main shaft 2.

While embodiments of the present invention have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the invention, all such changes being within the scope of the appended claims.

Claims (10)

1. A multi-nozzle centrifugal oil-gas separation device, comprising:

the first shell is internally provided with a first containing cavity, and the side wall of the first shell is provided with an oil return port communicated with the first containing cavity;

the main shaft is partially rotatably arranged in the first accommodating cavity, and the driving wheel is sleeved on the main shaft of the part; and

the plurality of nozzles are uniformly arranged at intervals around the periphery of the driving wheel and are used for jointly driving the driving wheel to rotate.

2. A multi-nozzle centrifugal oil-gas separation device, comprising:

the first shell is internally provided with a first containing cavity, and the side wall of the first shell is provided with an oil return port communicated with the first containing cavity;

the main shaft is partially rotatably arranged in the first accommodating cavity, and a plurality of driving wheels are sleeved on the main shaft of the part; and

and the periphery of each driving wheel is provided with at least one nozzle for respectively driving the corresponding driving wheel to rotate in a balanced manner.

3. The multi-nozzle centrifugal oil-gas separator according to claim 1 or 2, wherein a plurality of branch flow passages are provided in the side wall of the first casing, one end of each branch flow passage is converged outside the first casing to form a main flow passage, the other end of each branch flow passage is connected to the corresponding nozzle, and the flow rate of the fluid which is branched from the main flow passage into each branch flow passage and is discharged from the corresponding nozzle is kept uniform.

4. A multi-nozzle centrifugal oil and gas separation device according to claim 3, wherein the inner walls of the main flow passage, the branch flow passage and/or the inner wall of the first housing are provided with an oleophobic layer.

5. The multi-nozzle centrifugal oil-gas separation device according to claim 1 or 2, further comprising a second housing and a separation assembly, wherein an oil-gas inlet is provided at the bottom of the second housing, an air outlet is provided on the inner wall of the second housing near the top, a second chamber is provided inside the second housing, the main shaft portion is located in the second chamber and is rotatably connected with the second housing by providing an upper bearing and a lower bearing, the separation assembly is provided on the main shaft located in the second chamber, the separation assembly comprises a plurality of stacked discs, and the oil-gas mixture input from the oil-gas inlet is separated under the centrifugal force generated by rotation of the separation assembly.

6. The multi-nozzle centrifugal oil-gas separation device according to claim 5, wherein a plurality of flow guide ribs are circumferentially arranged on the inner wall of the second shell at intervals, each flow guide rib is of a segmented structure, each flow guide rib comprises at least two broken rib sections, and the rib sections circumferentially adjacent to each other are arranged in a staggered mode.

7. The multi-nozzle centrifugal oil-gas separator according to claim 5, wherein the disc has a hollow truncated cone structure, and an annular throttle rib is provided on the outer side wall of the disc, and the throttle rib has a continuous or discontinuous structure.

8. The multi-nozzle centrifugal gas-oil separator according to claim 7 wherein the throttle rib of said disc gradually decreases the throttle effect of said gas-oil mixture in the direction from top to bottom of said main shaft.

9. The multi-nozzle centrifugal oil and gas separation apparatus according to claim 8, wherein the throttle rib height assembly of the disc is reduced in a direction from top to bottom of the main shaft; or,

in the direction from top to bottom of the main shaft, the number of through holes on the throttling rib of the disc is gradually increased; or,

in the direction from top to bottom of the main shaft, the aperture of the through hole on the throttling rib of the disc is gradually increased; or,

the throttling ribs are of discontinuous structures, and the intervals among rib sections of the throttling ribs of the disc gradually increase in the direction from top to bottom of the main shaft; or,

in the direction from top to bottom of the main shaft, the number of the throttle ribs of the disc gradually decreases.

10. The multi-nozzle centrifugal oil-gas separation device according to claim 5, wherein a plug-in connector is arranged at the oil-gas inlet and/or the gas outlet, and the plug-in connector is used for separating gas in the oil-gas mixture.

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