Separator with gradient distribution porous filler and aero-engine

Abstract

The present application belongs to the field of centrifugal separators of aero-engines, and particularly relates to a separator with gradient-distributed porous filler and an aero-engine. The separator comprises a shell and a porous filler, the shell is provided with the porous filler, the shell is provided with an oil-gas inlet, an oil outlet and an exhaust outlet, along the radial direction of the shell, the oil-gas inlet is arranged at one end of the shell, the oil outlet and the exhaust outlet are arranged at the other end of the shell, the exhaust outlet is communicated with the transmission shaft, the holes of the porous filler have at least axial gradient and radial gradient, the axial gradient decreases from the end where the oil-gas inlet is arranged to the end where the oil outlet or the exhaust outlet is arranged, and the radial gradient decreases from outside to inside. The holes of the porous filler of the present application are gradient-distributed in the axial direction and the radial direction, not only the pressure drop is reasonable, but also the separation efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal separators for aero engines, specifically relating to a separator with gradient-distributed porous packing and an aero engine. Background Technology

[0002] The lubrication system of an aircraft engine is a crucial component of the mechanical system of a turboprop engine. It is responsible for supplying the necessary lubrication to all parts of the engine, determining whether the engine can operate safely and reliably. As modern aircraft engines develop towards higher temperatures, higher speeds, and higher power-to-weight ratios, higher demands are placed on the design of aircraft engine lubrication systems.

[0003] Centrifugal separators are a crucial component of the lubrication system. Mounted in the accessory housing, they primarily utilize centrifugal force to separate lubricating oil from hot gases in the transmission system. The separated lubricating oil is then recycled and reused, ensuring the transmission system operates under normal lubrication conditions for extended periods. However, if the centrifugal separator becomes inefficient or malfunctions, the lubrication system will fail, potentially leading to engine failure with extremely serious consequences. Currently, the most commonly used type is the blade-type centrifugal separator.

[0004] The blade-type centrifugal separator has low gas-oil separation efficiency, resulting in low engine operating stability and high lubricating oil consumption. For the same driving range, the engine needs to carry a larger amount of lubricating oil, necessitating a corresponding increase in the oil tank volume. This inevitably increases the engine's weight, thereby reducing its power-to-weight ratio.

[0005] Chinese Patent CN103982300B discloses a centrifugal separator for an aero-engine, comprising a rotating shaft and a centrifugal separator sleeved on the outer wall of the rotating shaft. The centrifugal separator includes a housing sleeved on the rotating shaft and a porous metal, with the porous metal filling the housing. Multiple oil return holes are arranged circumferentially on one end face of the housing. The centrifugal separator for an aero-engine provided by this invention has a simpler and more compact structure, is easier to assemble and disassemble, is lighter, has lower processing and maintenance costs, and higher oil-gas separation efficiency compared to a blade-type centrifugal separator.

[0006] However, the porous packing material used in this patent still has the disadvantage of low separation efficiency.

[0007] In view of this, the present invention is hereby proposed. Summary of the Invention

[0008] When the oil-gas mixture of lubricating oil is separated in the separator, large oil mist particles are separated first when the oil-gas mixture passes through the porous packing. If the pore size of the porous packing is too large, the separation effect of small oil mist particles will be poor, and they will still be mixed in the air, resulting in low oil-gas separation efficiency. If the pore size of the porous packing is too small, it will lead to an increase in the pressure drop of the separator, affecting the pressure matching of the entire system.

[0009] To address the technical problems existing in the prior art, this invention provides a separator and an aero-engine with a gradient-distributed porous packing. The porous packing of this invention has a gradient distribution of pore size in both the axial and radial directions, which not only results in a reasonable pressure drop but also high separation efficiency.

[0010] This invention includes the following technical solutions:

[0011] This invention provides a separator with a gradient-distributed porous packing, comprising a shell and porous packing. The porous packing is disposed within the shell, which is mounted on the drive shaft of an aero-engine. The shell has an oil / gas inlet, an oil outlet, and an exhaust outlet. Along the radial direction of the shell, the oil / gas inlet is located at one end and the oil outlet and exhaust outlet are located at the other end. The exhaust outlet communicates with the drive shaft. The porous packing has at least an axial gradient and a radial gradient in its pores. The axial gradient decreases from the end where the oil / gas inlet is located towards the end where the oil outlet or exhaust outlet is located, and the radial gradient decreases from the outside to the inside.

[0012] Further, the porous packing includes a first porous packing outer ring, a second porous packing outer ring, a first porous packing inner ring, and a second porous packing inner ring. The first porous packing outer ring is disposed outside the first porous packing inner ring, and the second porous packing outer ring is disposed outside the second porous packing inner ring. One side of the first porous packing outer ring mates with one side of the second porous packing outer ring, and one side of the first porous packing inner ring mates with one side of the second porous packing inner ring. The pore diameter of the first porous packing outer ring is larger than that of the second porous packing outer ring, the pore diameter of the first porous packing outer ring is larger than that of the first porous packing inner ring, the pore diameter of the first porous packing inner ring is larger than that of the second porous packing inner ring, and the pore diameter of the second porous packing outer ring is larger than that of the second porous packing inner ring.

[0013] Furthermore, the housing is connected to the drive shaft by screws, which are also used to connect the housing to the first porous packing inner ring and the housing to the second porous packing inner ring.

[0014] Furthermore, two screws are provided, and the two screws are arranged symmetrically.

[0015] Furthermore, the inner surface of the first porous packing outer ring is elliptical, the outer surface of the first porous packing inner ring is elliptical, and the inner surface of the first porous packing outer ring is connected to the outer surface of the first porous packing inner ring; and / or the inner surface of the second porous packing outer ring is elliptical, the outer surface of the second porous packing inner ring is elliptical, and the inner surface of the second porous packing outer ring is connected to the outer surface of the second porous packing inner ring.

[0016] Furthermore, the outer ring of the first porous packing has a pore size of 20 PPI, the inner ring of the first porous packing has a pore size of 45 PPI, the outer ring of the second porous packing has a pore size of 45 PPI, and the inner ring of the second porous packing has a pore size of 70 PPI.

[0017] Furthermore, the housing includes an annular outer shell, an annular inner shell, a first side shell, and a second side shell. The annular outer shell is disposed outside the annular inner shell, and the first side shell and the second side shell are both connected between the annular outer shell and the annular inner shell. The first side shell is provided with the oil and gas inlet, the annular inner shell is provided with the exhaust port, and the annular outer shell is provided with the oil outlet.

[0018] Furthermore, multiple oil and gas inlets are provided, which are arranged around the first side shell and are located close to the annular outer shell; and / or multiple oil outlets are provided, which are arranged around the annular outer shell and are located close to the second side shell; and / or multiple exhaust ports are provided, which are arranged around the annular outer shell and are located close to the second side shell.

[0019] A second aspect of the present invention provides an aircraft engine, including a drive shaft and the aforementioned separator, the separator being fixedly connected to the drive shaft.

[0020] Furthermore, the drive shaft is provided with a connecting boss, and the connecting boss and the separator are connected by screws.

[0021] By adopting the above technical solution, the present invention has the following advantages:

[0022] 1. The porous packing of the present invention has a gradient distribution of pore size in both the axial and radial directions, which not only results in a reasonable pressure drop but also high separation efficiency.

[0023] 2. The present invention has a simple and compact structure and good manufacturability.

[0024] 3. This invention improves the separation efficiency of the ventilator without increasing the pressure drop through the gradient design of porous packing, and can be adapted to different oil mist environments.

[0025] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a separator with gradient-distributed porous packing in an embodiment of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of a separator with gradient-distributed porous packing in an embodiment of the present invention. Figure 2 ;

[0029] Figure 3 This is a cross-sectional view of a separator with gradient-distributed porous packing in an embodiment of the present invention. Figure 1 ;

[0030] Figure 4 This is a cross-sectional view of a separator with gradient-distributed porous packing in an embodiment of the present invention. Figure 2 ;

[0031] Figure 5 This is a schematic diagram of the structure of an aero-engine according to an embodiment of the present invention;

[0032] In the diagram: 10-shell, 11-annular outer shell, 12-annular inner shell, 13-first side shell, 14-second side shell, 20-porous packing, 21-outer ring of the first porous packing, 22-outer ring of the second porous packing, 23-inner ring of the first porous packing, 24-inner ring of the second porous packing, 30-drive shaft, 31-connecting boss, 40-oil and gas inlet, 50-oil outlet, 60-vent, 70-screw, 80-screw hole. Detailed Implementation

[0033] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This embodiment provides a separator with a gradient-distributed porous packing 20, such as... Figure 1 As shown, the separator includes a housing 10 and a porous packing 20. The porous packing 20 is disposed within the housing 10. The housing 10 is mounted on the drive shaft 30 of an aero-engine. The housing 10 has an oil / gas inlet 40, an oil outlet 50, and an exhaust outlet 60. Along the radial direction of the housing 10, the oil / gas inlet 40 is located at one end of the housing 10, and the oil outlet 50 and exhaust outlet 60 are located at the other end. The exhaust outlet 60 communicates with the drive shaft 30. The porous packing 20 has at least an axial gradient and a radial gradient. This should be understood as the separator having at least two gradient distributions, namely an axial gradient distribution and a radial gradient distribution, but not limited to these two distributions. The axial gradient decreases from the end where the oil / gas inlet 40 is located towards the end where the oil outlet 50 or exhaust outlet 60 is located, and the radial gradient decreases from the outside to the inside. This structure provides better separation efficiency for oil / gas mixtures.

[0036] The separator is a ring-shaped structure, and the porous packing inside the shell is also a ring-shaped structure. Therefore, the porous packing has axial and radial directions.

[0037] Among them, the porous filler 20 includes irregularly structured porous materials (such as powder sintered porous materials, foamed metal materials, etc.) and regularly structured porous materials (such as metal wire mesh porous materials, octagonal structure porous materials, honeycomb porous materials, etc.). It should be noted that "regular" and "irregular" refer to whether the distribution of pores in the material is regular or irregular.

[0038] like Figure 2As shown, in operation, the oil-gas mixture enters the separator through the oil-gas inlet 40. The separated oil is discharged through the oil outlet 50 and the oil-gas inlet 40, while the air is discharged through the exhaust port 60. The porous packing 20 has a gradient pore size distribution in both the axial and radial directions. Large oil mist particles in the oil-gas mixture are separated in advance by the large-pore porous packing 20 and discharged through the oil outlet 50. As the air carrying small oil mist particles flows towards the exhaust port 60 of the separator, the pore size of the porous packing 20 decreases, making it easier for the oil mist to separate from the air. As the separated oil flows towards the oil outlet 50 under centrifugal force, the pore size of the porous packing 20 increases, making it easier for the oil to be discharged.

[0039] Since the separator of this invention is used in aircraft engines, which require lightweight components to reduce overall weight and improve flight safety; simultaneously, when setting the porous packing 20, it is necessary to ensure sufficient rigidity because it tends to move outward under centrifugal force during use; therefore, in some embodiments, such as Figure 1 As shown, the porous packing 20 includes a first porous packing outer ring 21, a second porous packing outer ring 22, a first porous packing inner ring 23, and a second porous packing inner ring 24. The first porous packing outer ring 21 is disposed outside the first porous packing inner ring 23, and the second porous packing outer ring 22 is disposed outside the second porous packing inner ring 24. One side of the first porous packing outer ring 21 mates with one side of the second porous packing outer ring 22, and one side of the first porous packing inner ring 23 mates with one side of the second porous packing inner ring 24. The pore diameter of the first porous packing outer ring 21 is larger than that of the second porous packing outer ring 22, the pore diameter of the first porous packing outer ring 21 is larger than that of the first porous packing inner ring 23, the pore diameter of the first porous packing inner ring 23 is larger than that of the second porous packing inner ring 24, and the pore diameter of the second porous packing outer ring 22 is larger than that of the second porous packing inner ring 24. This structure ensures the rigidity of the porous packing 20 while also minimizing the weight of the separator, thus achieving both axial and radial gradient changes in the porous packing 20.

[0040] It should be noted that the porous packing 20 contains many pores, and the pore diameter refers to the size of the pores in the porous material.

[0041] In some embodiments, such as Figure 1 , Figure 2The housing 10 is connected to the drive shaft 30 by screws 70; the screws 70 are also used to connect the housing 10 to the first porous packing inner ring 23, and to the second porous packing inner ring 24 (not shown in the figure); both the first porous packing inner ring 23 and the second porous packing inner ring 24 are connected to the housing 10 by screws 70 connecting the housing 10 to the drive shaft 30, simplifying the structure and making it easier to reduce the weight of the separator. Of course, the first porous packing inner ring 23 and the second porous packing inner ring 24 can also be connected to the housing 10 by pins; such as Figure 4 As shown in the figure, pin holes are provided on the first porous packing 20.

[0042] It should be noted that, in parallel with the connection of the screw 70 to the housing 10 and the first porous packing inner ring 23, and the connection of the screw 70 to the housing 10 and the second porous packing inner ring 24, the connection of the screw 70 to the housing 10 and the first porous packing outer ring 21, and the connection of the screw 70 to the housing 10 and the second porous packing outer ring 22, should also be within the scope of protection of this invention. However, the connection of the screw 70 to the housing 10 and the first porous packing inner ring 23, and the connection of the screw 70 to the housing 10 and the second porous packing inner ring 24 has the advantage of reducing the weight of the drive shaft 30, and thus the advantage of reducing the weight of the aero-engine and the aircraft.

[0043] In some embodiments, two screws 70 are provided, and the two screws 70 are arranged symmetrically. This makes the structure more stable and has the advantage of improving the service life of the separator.

[0044] During the operation of the separator, it is necessary to ensure that the porous packing 20 rotates synchronously and has no relative movement to each other. Therefore, based on the aforementioned screw 70 also being used to connect the housing 10 to the first porous packing inner ring 23, and the screw 70 also being used to connect the housing 10 to the second porous packing inner ring 24, or the first porous packing inner ring 23 and the second porous packing inner ring 24 being connected to the housing 10 via a pin, in some embodiments, such as... Figure 3As shown, the inner surface of the first porous packing outer ring 21 is elliptical, the outer surface of the first porous packing inner ring 23 is elliptical, and the inner surface of the first porous packing outer ring 21 is connected to the outer surface of the first porous packing inner ring 23; and / or the inner surface of the second porous packing outer ring 22 is elliptical, the outer surface of the second porous packing inner ring 24 is elliptical, and the inner surface of the second porous packing outer ring 22 is connected to the outer surface of the second porous packing inner ring 24. The connection is achieved through an elliptical fit, reducing the use of screws 70 or pins, and has the advantages of reducing assembly complexity and the weight of the separator.

[0045] Of course, such as Figure 4 As shown, the inner surface of the first porous packing outer ring 21 is circular, the outer surface of the first porous packing inner ring 23 is circular, and the inner surface of the first porous packing outer ring 21 is connected to the outer surface of the first porous packing inner ring 23; and / or the inner surface of the second porous packing outer ring 22 is circular, the outer surface of the second porous packing inner ring 24 is circular, and the inner surface of the second porous packing outer ring 22 is connected to the outer surface of the second porous packing inner ring 24; this should also be within the scope of protection of this invention. With such a structure, the first porous packing inner ring 23 and the second porous packing outer ring 22 can be fixed to the housing 10 by a pin.

[0046] In some embodiments, the pore size of the first porous packing outer ring 21 is 20 PP I, the pore size of the first porous packing inner ring 23 is 45 PP I, the pore size of the second porous packing outer ring 22 is 45 PP I, and the pore size of the second porous packing inner ring 24 is 70 PP I.

[0047] In some embodiments, the housing 10 includes an annular outer shell 11, an annular inner shell 12, a first side shell 13, and a second side shell 14. The annular outer shell 11 is disposed outside the annular inner shell 12. The first side shell 13 and the second side shell 14 are both connected between the annular outer shell 11 and the annular inner shell. The first side shell 13 is provided with an oil and gas inlet 40, the annular inner shell 12 is provided with an exhaust port 60, and the annular outer shell 11 is provided with an oil outlet 50. By restricting the positions of the oil and gas inlet 40, the exhaust port 60, and the oil outlet 50, the oil and gas separation efficiency is improved.

[0048] In some embodiments, multiple oil and gas inlets 40 are provided, arranged around the first side shell 13, and positioned close to the annular outer shell 11; and / or multiple oil outlets 50 are provided, arranged around the annular outer shell 11, and positioned close to the second side shell 14; and / or multiple exhaust ports 60 are provided, arranged around the annular outer shell 11, and positioned close to the second side shell 14. Further restricting the positions of the oil and gas inlets 40, exhaust ports 60, and oil outlets 50 has the advantage of further improving oil-gas separation efficiency. Simultaneously, restricting the position of the oil and gas inlets 40 allows some separated oil droplets to be discharged directly from the oil and gas inlets 40, which can alleviate the oil discharge pressure at the separator exhaust port 50 and reduce the time oil droplets accumulate and separate within the porous packing 20.

[0049] This embodiment also provides an aero-engine, including a drive shaft 30 and the aforementioned separator, wherein the separator is fixedly connected to the drive shaft 30. Specifically, the housing of the separator is arranged around the drive shaft of the aero-engine. The aero-engine of this invention not only has a low pressure drop under large ventilation conditions but also high oil-gas separation efficiency; compared with aero-engines without gradient packing design, it improves oil-gas separation efficiency without increasing pressure drop.

[0050] In some embodiments, the drive shaft 30 is provided with a connecting boss 31, and the connecting boss 31 and the separator are connected by screws 70.

[0051] This embodiment also provides an aircraft including the aforementioned aircraft engine. The aircraft of the present invention not only has a low pressure drop under large ventilation conditions, but also high oil-gas separation efficiency; compared with aircraft without gradient packing design, it improves oil-gas separation efficiency without increasing pressure drop.

[0052] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of multiple components or the interaction between multiple components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In the description of this invention, it should be understood that all terms used to indicate orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this invention.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centrifuge with a gradient-distributed porous packing material, comprising a shell (10) and porous packing material (20), wherein the porous packing material (20) is disposed within the shell (10), characterized in that, The housing (10) is provided with an oil and gas inlet (40), an oil outlet (50) and an exhaust outlet (60). Along the axial direction of the housing (10), an oil and gas inlet (40) is provided at one end of the housing (10) and an oil outlet (50) and an exhaust outlet (60) are provided at the other end. The exhaust outlet (60) is connected to the drive shaft (30). The porous packing (20) has at least an axial gradient and a radial gradient in its pore size. The axial gradient decreases from the end where the oil and gas inlet (40) is located to the end where the oil outlet (50) or the exhaust outlet (60) is located. The radial gradient decreases from the outside to the inside. The porous packing (20) includes a first porous packing outer ring (21), a second porous packing outer ring (22), a first porous packing inner ring (23), and a second porous packing inner ring (24). The first porous packing outer ring (21) is disposed outside the first porous packing inner ring (23), and the second porous packing outer ring (22) is disposed outside the second porous packing inner ring (24). One side of the first porous packing outer ring (21) mates with one side of the second porous packing outer ring (22). One side of the inner ring (23) mates with one side of the inner ring (24) of the second porous packing; the pore diameter of the outer ring (21) of the first porous packing is larger than the pore diameter of the outer ring (22) of the second porous packing, the pore diameter of the outer ring (21) of the first porous packing is larger than the pore diameter of the inner ring (23) of the first porous packing, the pore diameter of the inner ring (23) of the first porous packing is larger than the pore diameter of the inner ring (24) of the second porous packing, and the pore diameter of the outer ring (22) of the second porous packing is larger than the pore diameter of the inner ring (24) of the second porous packing; The housing (10) includes an annular outer shell (11), an annular inner shell (12), a first side shell (13), and a second side shell (14). The annular outer shell (11) is disposed outside the annular inner shell (12). The first side shell (13) and the second side shell (14) are both connected between the annular outer shell (11) and the annular inner shell. The first side shell (13) is provided with an oil and gas inlet (40), and the oil and gas inlet (40) is disposed close to the annular outer shell (11). The annular inner shell (12) is provided with an exhaust port (60), and the exhaust port (60) is disposed close to the second side shell (14). The annular outer shell (11) is provided with an oil drain port (50), and the oil drain port (50) is disposed close to the second side shell (14).

2. A centrifugal separator with gradient-distributed porous packing according to claim 1, characterized in that, The housing (10) is connected to the drive shaft (30) by screws (70). The screws (70) are also used to connect the housing (10) to the first porous packing inner ring (23) and the housing (10) to the second porous packing inner ring (24).

3. A centrifugal separator with gradient-distributed porous packing material according to claim 2, characterized in that, Two screws (70) are provided, and the two screws (70) are arranged symmetrically.

4. A centrifugal separator with gradient-distributed porous packing according to claim 2, characterized in that, The inner surface of the first porous packing outer ring (21) is elliptical, the outer surface of the first porous packing inner ring (23) is elliptical, and the inner surface of the first porous packing outer ring (21) is connected to the outer surface of the first porous packing inner ring (23); and / or the inner surface of the second porous packing outer ring (22) is elliptical, the outer surface of the second porous packing inner ring (24) is elliptical, and the inner surface of the second porous packing outer ring (22) is connected to the outer surface of the second porous packing inner ring (24).

5. A centrifugal separator with gradient-distributed porous packing according to any one of claims 1-4, characterized in that, The outer ring (21) of the first porous packing has a pore size of 20 PPI, the inner ring (23) of the first porous packing has a pore size of 45 PPI, the outer ring (22) of the second porous packing has a pore size of 45 PPI, and the inner ring (24) of the second porous packing has a pore size of 70 PPI.

6. A centrifuge with gradient-distributed porous packing material according to claim 1, characterized in that, Multiple oil and gas inlets (40) are provided, and multiple oil and gas inlets (40) are arranged around the first side shell (13); and / or multiple oil outlets (50) are provided, and multiple oil outlets (50) are arranged around the annular outer shell (11); and / or multiple exhaust ports (60) are provided, and multiple exhaust ports (60) are arranged around the annular inner shell (12).

7. An aircraft engine, comprising a drive shaft (30), characterized in that, It also includes a separator as described in any one of claims 1-6, the separator being fixedly connected to the drive shaft (30).

8. An aero-engine according to claim 7, characterized in that, The drive shaft (30) is provided with a connecting boss (31), and the connecting boss (31) and the separator are connected by screws (70).

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