A constant cross-section centrifugal ventilator

Abstract

The application provides an equal-section centrifugal ventilator, which comprises a spoke plate, a left end plate and a right end plate, the left end plate, the right end plate and the spoke plate form an oil-gas separation channel, the inner side of the oil-gas separation channel is communicated with a ventilator inner cavity, the size of the ventilator inner cavity and the size of the ventilator outer contour are the same as those of an original centrifugal ventilator, wherein the axial length of the spoke plate gradually decreases from the ventilator inner cavity side to the outer side, and the spacing between two adjacent spoke plates gradually increases, so that the oil-gas separation channel surrounded by the left end plate, the right end plate and the spoke plate forms an equal-section structure from the ventilator inner cavity to the outside. Through the equal-section design of the oil-gas separation channel of the centrifugal ventilator, under the premise that the size of the ventilator inner cavity and the size of the ventilator outer contour are the same as those of the original ventilator, compared with the current straight-plate centrifugal ventilator, the axial length of the outer diameter of the spoke plate is reduced under the premise that the minimum flow area is unchanged, so that the weight of the centrifugal ventilator is reduced, and finally the weight of the aero-engine is effectively reduced.

Description

A centrifugal ventilator with uniform cross-section Technical Field

[0001] This application belongs to the field of centrifugal ventilator technology, and specifically relates to a centrifugal ventilator with a constant cross-section. Background Technology

[0002] As shown in Figure 1, the impeller-type centrifugal ventilator (or spoke-type centrifugal ventilator 10) is one of the most widely used ventilators in aero engines. Its main structure includes spokes 11, left end plate 12, right end plate 13 and internal spline 14. Spokes 11, left end plate 12 and right end plate 13 constitute the main structure of the centrifugal ventilator. When the oil-gas mixture passes through the spokes 11 of the rotating centrifugal ventilator, the oil droplets in the mixture are thrown out by centrifugal force and return to the bearing cavity or casing. The air is discharged outside the cavity by means of the pressure difference between the inlet and outlet of the ventilator, thereby realizing oil-gas separation.

[0003] The flow resistance of a centrifugal ventilator mainly depends on the rotational speed and the minimum flow area, while the engine's design rotational speed is a fixed value. To reduce the resistance of a centrifugal ventilator, the minimum flow area of ​​the spokes needs to meet certain requirements. Traditional spoke-type centrifugal ventilators are usually of a straight-plate structure—that is, the spokes are straight plates with a fixed axial length. Therefore, the closer to the outer diameter of the ventilator, the larger its cross-sectional area becomes, but this does not significantly reduce the ventilator's resistance and increases the weight of the components, which is detrimental to the overall weight reduction of the aero-engine structure. Summary of the Invention

[0004] The purpose of this application is to provide a centrifugal ventilator with uniform cross-section to solve or mitigate at least one of the problems in the prior art.

[0005] The technical solution of this application is: a centrifugal ventilator with equal cross-section, the centrifugal ventilator with equal cross-section includes: a spoke plate, a left end plate and a right end plate, the left end plate, the right end plate and the spoke plate constitute an oil-gas separation channel, the inner side of the oil-gas separation channel is connected to the inner cavity of the ventilator, the inner cavity size of the ventilator and the outer contour size of the ventilator are the same as the original centrifugal ventilator, wherein, the axial length of the spoke plate (21) gradually decreases from the root of the oil-gas separation channel to the outer side of the oil-gas separation channel, and at the same time, the distance between two adjacent spoke plates from the root of the oil-gas separation channel to the outer edge of the oil-gas separation channel gradually increases, so that the cross-section formed by the axial length of the spoke plate at the root of the oil-gas separation channel and the distance between two adjacent spoke plates at the root of the oil-gas separation channel and the cross-section formed by the axial length of the spoke plate at the outer edge of the oil-gas separation channel and the distance between two adjacent spoke plates at the root of the oil-gas separation channel forms an equal cross-section structure.

[0006] Furthermore, the spokes have a trapezoidal structure.

[0007] Furthermore, the trapezoid includes isosceles trapezoids and right trapezoids.

[0008] Furthermore, the constant cross-section centrifugal ventilator also includes an internal spline, which is disposed on the inner surface of the end plate on either side. The constant cross-section centrifugal ventilator is connected to the rotating shaft through the internal spline, thereby realizing the transmission of rotational speed.

[0009] This application designs the oil-gas separation channel of the centrifugal ventilator with a constant cross-section. While ensuring that the inner cavity and outer contour dimensions of the ventilator are the same as the original ventilator, the minimum cross-sectional area formed by multiple oil-gas separation channels remains the same. Compared with the current straight plate centrifugal ventilator, the outer diameter and axial length of the spokes are reduced without changing the minimum flow area, thereby reducing the weight of the centrifugal ventilator and ultimately effectively reducing the weight of the aero engine. Attached Figure Description

[0010] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0011] Figure 1 is a cross-sectional view of a prior art radial centrifugal ventilator.

[0012] Figure 2 is a cross-sectional view of the centrifugal ventilator with constant cross-section according to this application.

[0013] Figure 3 is a schematic diagram of the root dimensions of the cover plate of the centrifugal ventilator with uniform cross-section according to this application.

[0014] Figure 4 is a schematic diagram of the top dimensions of the cover plate of the centrifugal ventilator with uniform cross-section according to this application. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0016] This application proposes a novel radial centrifugal ventilator structure. By using a structural design with equal cross-sectional area while meeting the minimum flow area requirement, the weight of the radial centrifugal ventilator can be significantly reduced, which is beneficial for weight reduction in aero engines.

[0017] As shown in Figure 2, the centrifugal ventilator 20 with uniform cross-section provided in this application includes a spoke 21, a left end plate 22, and a right end plate 23. The left end plate 22, the right end plate 23, and the spoke 21 constitute an oil-gas separation channel 25. The inner side of the oil-gas separation channel 25 is connected to the inner cavity of the ventilator. The inner cavity size and the outer contour size of the ventilator are the same as those of the original centrifugal ventilator. The axial length of the spoke 21 gradually decreases from the root of the oil-gas separation channel 25 to the outer side of the oil-gas separation channel 25. At the same time, the distance between two adjacent spokes 21 from the root of the oil-gas separation channel 25 to the outer edge of the oil-gas separation channel 25 gradually increases. This makes the cross-section formed by the axial length of the spoke 21 at the root of the oil-gas separation channel 25 and the distance between two adjacent spokes 21 at the root of the oil-gas separation channel 25 and the cross-section formed by the axial length of the spoke 21 at the outer edge of the oil-gas separation channel 25 and the distance between two adjacent spokes 21 at the root of the oil-gas separation channel 25 form a uniform cross-section structure.

[0018] Figures 3 and 4 show the area diagram of the oil-gas separation channel of the centrifugal ventilator with uniform cross-section according to this application. At the root of the oil-gas separation channel 25 of the centrifugal ventilator 20, the axial length of the spoke 21 is L1, and the distance between two adjacent spokes 21 is W1. At the outer edge of the oil-gas separation channel 25 of the centrifugal ventilator 20, the axial length of the spoke 21 is L2, and the distance between two adjacent spokes 21 is W2. L1×W1=L2×W2, so that the oil-gas separation channel 25 can form a channel with uniform cross-section.

[0019] In some embodiments of this application, the spokes 21 can be an isosceles trapezoid or a right trapezoid, etc. Since the distance between two adjacent spokes 21 will inevitably gradually increase along the radial direction, this application can ensure that the cross-section of the oil-gas separation channel 25 is always equal by making the cross-section of the spokes 21 gradually smaller in the radial direction and by controlling the distance between two adjacent spokes 21.

[0020] In addition, the constant cross-section centrifugal ventilator 20 provided in this application also includes an internal spline 24, which is disposed on the inner surface of the end plate on either side. The constant cross-section centrifugal ventilator 20 is connected to the rotating shaft through the internal spline 24, thereby realizing the transmission of rotational speed. For example, in the embodiment shown in FIG2 of this application, the internal spline 24 is disposed on the inner surface of the left end plate 22.

[0021] This application designs the oil-gas separation channel of the centrifugal ventilator with a constant cross-section. While ensuring that the inner cavity and outer contour dimensions of the ventilator are the same as the original ventilator, the minimum cross-sectional area formed by multiple oil-gas separation channels remains the same. Compared with the current straight plate centrifugal ventilator, the outer diameter and axial length of the spokes are reduced without changing the minimum flow area, thereby reducing the weight of the centrifugal ventilator and ultimately effectively reducing the weight of the aero engine.

[0022] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A centrifugal ventilator with a constant cross-section, characterized in that, The centrifugal ventilator (20) with constant cross-section includes: a spoke (21), a left end plate (22), and a right end plate (23). The left end plate (22), the right end plate (23), and the spoke (21) constitute an oil-gas separation channel (25). The inner side of the oil-gas separation channel (25) is connected to the inner cavity of the ventilator. The inner cavity size and the outer contour size of the ventilator are the same as those of the original centrifugal ventilator. The axial length of the spoke (21) gradually decreases from the root of the oil-gas separation channel (25) to the outer side of the oil-gas separation channel (25). At the same time, the distance between two adjacent spokes (21) from the root of the oil-gas separation channel (25) to the outer edge of the oil-gas separation channel (25) gradually increases. This makes the cross-section formed by the axial length of the spoke at the root of the oil-gas separation channel and the distance between two adjacent spokes at the root of the oil-gas separation channel and the cross-section formed by the axial length of the spoke at the outer edge of the oil-gas separation channel and the distance between two adjacent spokes at the root of the oil-gas separation channel form a constant cross-section structure.

2. The centrifugal ventilator with uniform cross-section as described in claim 1, characterized in that, The spokes (21) have a trapezoidal structure.

3. The centrifugal ventilator with uniform cross-section as described in claim 2, characterized in that, The trapezoids include isosceles trapezoids and right trapezoids.

4. The centrifugal ventilator with uniform cross-section as described in claim 1, characterized in that, The centrifugal ventilator (20) with constant cross-section also includes an internal spline (24), which is set on the inner surface of the end plate on either side. The centrifugal ventilator (20) with constant cross-section is connected to the rotating shaft through the internal spline (24) to realize the transmission of rotational speed.

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