A radial inlet compressor casing

Abstract

The present application belongs to the technical field of compressors, and provides a radial inlet compressor case, which comprises a case front section, an inlet cylinder and a case rear section connected in sequence; the case front section, the inlet cylinder and the case rear section are coaxially arranged; the inner surface of the case front section is provided with a plurality of reinforcing ribs, and part of the reinforcing ribs is provided with a pipeline for oil supply and cleaning; the surface of the inlet cylinder is provided with a plurality of radial inlet holes. The present application adopts the inlet cylinder, which is provided with radial inlet holes, so that the external atmosphere can directly enter the inside of the inlet case through the inlet holes during use, and the inlet cylinder has strong anti-distortion capacity relative to the inlet branch plate, can prevent foreign matters larger than the inlet hole diameter from entering the inlet case, has less influence on the vibration characteristics of the wheel disc blade, and reduces the manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressors, and particularly relates to a radial inlet casing of a compressor. BACKGROUND

[0002] The inlet casing is a key component in the inlet system of an aero-engine, which allows external air to enter the engine to meet the needs of the engine under different working conditions.

[0003] As shown in Figure 1 , the current commonly used compressor is a radial inlet casing with inlet vanes, which is designed with flange edges at the front and rear ends to connect with adjacent casings, and as shown in Figure 2 , the middle section of the inlet casing is provided with a plurality of inlet vanes, and the adjacent inlet vanes form an air flow channel, through which external air enters the inside of the engine.

[0004] However, the existing inlet casing has the following disadvantages:

[0005] 1. The inlet vanes have a streamlined shape, and the structure of the casting blank mold is complex, with high processing cost;

[0006] 2. The inlet channel has no external protection function;

[0007] 3. The inlet vanes form a fixed excitation source, which affects the vibration characteristics of the rotor blades. SUMMARY

[0008] In order to solve at least one problem in the background art, the present application proposes a radial casing of a compressor.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0010] A radial inlet casing of a compressor, comprising a casing front section, an inlet cylinder and a casing rear section connected in sequence;

[0011] The casing front section, the inlet cylinder and the casing rear section are coaxially arranged;

[0012] The inner surface of the casing front section is provided with a plurality of reinforcing ribs, and part of the reinforcing ribs is provided with a pipeline for oil supply and cleaning;

[0013] The surface of the inlet cylinder is provided with a plurality of radial inlet holes.

[0014] Preferably, the casing front section is a rotary body, one end of which is provided with a first flange, and the other end is welded with the inlet cylinder;

[0015] The casing front section is provided with a second flange at the center;

[0016] The reinforcing ribs extend radially from the second flange to the inner surface of the outermost side of the casing front section.

[0017] Preferably, the second flange is internally provided with a ventilation pipeline and an oil return pipeline;

[0018] The ventilation pipeline is uniformly provided with several pipelines around the air intake casing axis, with the inlet end located on the outer surface of the second flange and the outlet end located on the inner surface of the second flange.

[0019] The oil return pipeline is provided with at least one pipeline, with the inlet end located on the outer surface of the second flange and the outlet end located on the inner surface of the second flange.

[0020] Preferably, the reinforcing rib includes a first reinforcing rib, a second reinforcing rib and several third reinforcing ribs uniformly distributed around the air intake casing axis.

[0021] Preferably, the first reinforcing rib is internally provided with a cleaning pipeline, with the inlet end located on the outermost side of the front section of the casing and the outlet end extending to the inside of the air intake cylinder.

[0022] Preferably, the second reinforcing rib is internally provided with a second oil supply pipeline and a third oil supply pipeline.

[0023] One end of the second oil supply pipeline is communicated with the first oil supply pipeline, and the other end is communicated with the third oil supply pipeline.

[0024] The first oil supply pipeline is provided on the end surface of the first flange.

[0025] The end of the third oil supply pipeline away from the second oil supply pipeline is communicated with the fourth oil supply pipeline, and the fourth oil supply pipeline is provided in the second flange along the air intake casing axis.

[0026] Preferably, the second flange is internally provided with a fifth oil supply pipeline and an oil film cavity.

[0027] One end of the fifth oil supply pipeline is communicated with the fourth oil supply pipeline, and the other end is communicated with the oil film cavity, and the oil film cavity is provided on the inner surface of the second flange.

[0028] Preferably, the second flange is internally provided with an oil injection hole.

[0029] The inner surface of the second flange is provided with an annular front elastic support, and the front elastic support is used to close the oil film cavity.

[0030] The surface of the front elastic support is uniformly provided with several windows around the circumference, and the oil sprayed from the oil injection hole reaches the bearing through the windows.

[0031] Preferably, the inner surface of the second flange is provided with an annular grid, and the grid is located on one side of the front elastic support and is used to seal the bearing cavity.

[0032] Preferably, the rear section of the casing is a rotary body, one end of which is welded to the end of the air inlet cylinder away from the front section of the casing, and the other end is provided with a third flange;

[0033] The center of the rear section of the casing is provided with a fourth flange, and the fourth flange and the third flange are connected by the casing wall of the rear section of the casing.

[0034] The beneficial effects of the present application are:

[0035] 1. The present application adopts an air inlet cylinder, which is provided with radial air inlet holes. During use, external atmosphere can directly enter the inside of the air inlet casing through the air inlet holes. The air inlet cylinder has strong anti-distortion ability relative to the air inlet branch plate, can prevent objects larger than the air inlet hole diameter from entering the air inlet casing, has less influence on the vibration characteristics of the wheel disc blade, and reduces the manufacturing cost.

[0036] 2. The present application opens cleaning and oil supply structures in the stiffeners, reasonably utilizes the structural layout of the air inlet casing, opens a cleaning pipeline in the first stiffener, and directly injects cleaning agent outside the air inlet casing through the cleaning pipeline to clean the engine conveniently and efficiently. Meanwhile, the present application opens a first oil supply pipeline, a second oil supply pipeline, a third oil supply pipeline, a fourth oil supply pipeline, a fifth oil supply pipeline and an oil film cavity in the second stiffener. When oil supply is performed, oil can be injected into the oil film cavity through the above pipelines to form a squeezed oil film, which can absorb the vibration energy of the compressor rotor and improve the engine running stability.

[0037] 3. The present application adopts a grid tooth inside the second flange, which can effectively prevent lubricating oil from entering the airflow channel along the axial direction, and improves the axial sealing effect.

[0038] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0040] Figure 1 A longitudinal sectional view of the existing air inlet casing is shown;

[0041] Figure 2 A transverse sectional view of the existing air inlet casing is shown;

[0042] Figure 3 A longitudinal sectional view of a compressor inlet casing is shown in the present application;

[0043] Figure 4 A side view of a compressor inlet casing is shown in the present application;

[0044] Figure 5 A sectional view of the present application is shown in Figure 4 J-J plane;

[0045] Figure 6 A sectional view of the present application is shown in Figure 4 K-K plane;

[0046] Figure 7 A schematic view of the sealing structure and oil film structure of the present application is shown.

[0047] In the figure: 1, front section of casing; 101, first flange; 102, second flange; 103, ventilation pipeline; 104, oil return pipeline; 105, first reinforcing rib; 106, second reinforcing rib; 107, third reinforcing rib; 108, cleaning pipeline; 109, first oil supply pipeline; 1010, second oil supply pipeline; 1011, third oil supply pipeline; 1012, fourth oil supply pipeline; 1013, fifth oil supply pipeline; 1014, oil film cavity; 1015, oil injection hole; 2, rear section of casing; 201, third flange; 202, fourth flange; 3, inlet cylinder; 301, inlet hole; 4, front spring support; 5, grille. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] A compressor radial inlet casing, as shown in Figure 3 The inlet casing mainly consists of three parts: front section of casing 1, rear section of casing 2 and inlet cylinder 3. The three parts work together to ensure stable operation of the inlet casing.

[0050] Wherein the front section 1 and the rear section 2 of the casing are thin-walled castings, adopting a rotary body structure. This design not only makes the casing have sufficient strength to withstand various complex working environments and external pressures, but also ensures the lightness of the casing, which is conducive to reducing the overall weight and improving the use efficiency. The intake cylinder 3 is bent from sheet metal. The design of the intake cylinder 3 fully considers the intake efficiency and airflow stability to ensure that the engine can obtain stable and sufficient air supply.

[0051] During installation, the front section 1 of the casing, the intake cylinder 3 and the rear section 2 of the casing are sequentially welded. The welding process needs to strictly control the welding temperature and welding speed to ensure the welding quality. At the same time, after welding is completed, strict detection needs to be carried out to ensure that the connection between the various components is firm and reliable, without leakage or seepage phenomenon. Ensure the overall performance and reliability of the intake casing, and provide strong protection for the normal operation of the engine.

[0052] It should be noted that, Figure 3 In the structure of the casing, the front section 1 and the rear section 2 of the casing are thin-walled castings, and the intake cylinder 3 is a sheet metal bending piece, which is lighter in weight than Figure 1 The structure, which is conducive to lightening, while reducing the processing cost. In addition, the intake cylinder 3 can be welded at the bending butt joint position to ensure the stability of the intake cylinder 3.

[0053] Further, as shown in Figure 3 The end of the front section 1 of the casing away from the intake cylinder 3 is provided with a first flange 101, and a second flange 102 is provided at the axis A, and the first flange 101 and the second flange 102 are connected by a thin wall. Moreover, the inner surface of the front section 1 of the casing away from the intake cylinder 3 is a concave surface, and a plurality of reinforcing ribs are arranged on the inner surface, and some of the reinforcing ribs are provided with pipelines for oil supply and cleaning.

[0054] In addition, in Figure 3 The surface of the intake cylinder 3 is provided with a plurality of radial intake holes 301, and external air can directly enter the intake cylinder 3 through the intake holes 301, and then enter the engine interior for compression.

[0055] It should be noted that the intake holes 301 are uniformly distributed, which not only ensures the intake efficiency of the airflow, but also takes into account the coordination of the structure. External air can pass through these intake holes 301 into the interior of the intake cylinder 3, and then enter the interior of the engine for compression.

[0056] In addition, in Figure 3In the middle, the rear section 2 of the casing is a rotating body, one end of which is welded to the end of the air intake cylinder 3 away from the front section 1 of the casing, and the other end is provided with a third flange 201; a fourth flange 202 is provided at the center of the rear section 2 of the casing, and the fourth flange 202 and the third flange 201 are connected through the casing wall of the rear section 2 of the casing.

[0057] In addition, a ventilation duct 103 and an oil return duct 104 are provided inside the second flange 102. Several ventilation ducts 103 are evenly arranged circumferentially around the intake casing axis, inclined relative to the axis, with their inlet ends located on the outer surface of the second flange 102 and their outlet ends located on the inner surface of the second flange 102. At least one oil return duct 104 is provided, inclined relative to the axis, with its inlet end located on the outer surface of the second flange 102 and its outlet end located on the inner surface of the second flange 102.

[0058] Furthermore, such as Figure 4 As shown, the reinforcing ribs all originate from the second flange 102 and extend radially to the outermost inner surface of the front section 1 of the casing. The types of reinforcing ribs include a first reinforcing rib 105, a second reinforcing rib 106, and seven third reinforcing ribs 107. The three types of reinforcing ribs are evenly distributed circumferentially around the intake casing axis, which improves the structural strength of the front section 1 of the casing.

[0059] In addition, from Figure 4 As can be seen, there are multiple ventilation pipes 103, evenly distributed around the second flange 102. There is one oil return pipe 104, located opposite the second reinforcing rib 106.

[0060] Furthermore, such as Figure 5 As shown, Figure 4 A cross-sectional view of the middle JJ surface. The first reinforcing rib 105 has a cleaning pipe 108 inside. The inlet end of the cleaning pipe 108 is located at the outermost side of the front section 1 of the casing, and the outlet end extends into the air intake 3.

[0061] It should be noted that when cleaning is required, clean water or cleaning agent can be introduced through the cleaning pipe 108 to clean the engine.

[0062] Furthermore, such as Figure 6 As shown, the second reinforcing rib 106 contains a second oil supply line 1010 and a third oil supply line 1011. One end of the second oil supply line 1010 is connected to the first oil supply line 109, and the other end is connected to the third oil supply line 1011. The first oil supply line 109 is located on the end face of the first flange 101. The end of the third oil supply line 1011 away from the second oil supply line 1010 is connected to the fourth oil supply line 1012, which is located axially within the second flange 102 along the intake casing.

[0063] It should be noted that, inFigure 6 The first oil supply pipe 109 extends from the end surface of the first flange 101 to the inside and communicates with the second oil supply pipe 1010. The inlet end of the second oil supply pipe 1010 is located on the surface of the front section 1 of the casing and is blocked by a plug to prevent leakage. Similarly, the inlet ends of the third oil supply pipe 1011 and the fourth oil supply pipe 1012 are also provided with plugs.

[0064] It should be further explained that the first reinforcing rib 105 and the second reinforcing rib 106 are larger in size than the third reinforcing rib 107 because they are internally provided with pipes. The main function of the third reinforcing rib 107 is to improve the structural strength of the front section 1 of the casing.

[0065] Further, as shown in Figure 7 The second flange 102 is internally provided with a fifth oil supply pipe 1013, an oil film cavity 1014 and an oil injection hole 1015. The fifth oil supply pipe 1013 communicates with the fourth oil supply pipe 1012 at one end and with the oil film cavity 1014 at the other end, and the oil film cavity 1014 is formed on the inner surface of the second flange 102.

[0066] It should be noted that when oil is supplied, the oil passes through the first oil supply pipe 109, the second oil supply pipe 1010, the third oil supply pipe 1011, the fourth oil supply pipe 1012 and the fifth oil supply pipe 1013 in sequence, and finally enters the oil film cavity 1014 to form an oil film.

[0067] In addition, the oil injection hole 1015 can directly inject oil to the bearing on the inside of the second flange 102 for lubrication.

[0068] Further, as shown in Figure 7 The inner surface of the second flange 102 is provided with an annular front spring 4, which is used to close the oil film cavity 1014. In addition, the front spring 4 is uniformly provided with a plurality of windows in the circumferential direction, and the oil injected from the oil injection hole 1015 can pass through the windows to reach the bearing. In addition, the inner surface of the second flange 102 is provided with an annular labyrinth 5, which is located on one side of the front spring 4 and is used to seal the bearing cavity.

[0069] It should be noted that the labyrinth 5 forms a sealing structure to seal the bearing cavity, which can prevent the bearing lubricating oil from entering the compressor flow passage in the axial direction; at the same time, the extrusion oil film formed by the front spring 4 can absorb the vibration energy of the compressor rotor, thereby improving the stability of the engine operation.

[0070] It should be further explained that the front spring 4 is uniformly distributed along the axis in the circumferential direction, and it does not block the outlet end of the oil injection hole 1015, so the oil injection hole 1015 can directly inject oil to the bearing on the inside of the second flange 102.

[0071] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood that modifications can be made to the foregoing embodiments, or additional implementations can be implemented, without departing from the spirit and scope of the inventive subject matter. Accordingly, the present application is not limited to the implementations described herein, but is intended to be defined by the claims set forth below, and equivalents thereof.

Claims

1. A radial inlet compressor cowl, characterized by, The casing front section (1), the air inlet cylinder (3) and the casing rear section (2) are coaxially arranged. The casing front section (1), the air inlet cylinder (3) and the casing rear section (2) are coaxially arranged. The inner surface of the casing front section (1) is provided with a plurality of reinforcing ribs, and part of the reinforcing ribs is internally provided with a pipeline for oil supply and cleaning. The surface of the air inlet cylinder (3) is provided with a plurality of radial air inlet holes (301).

2. A radial compressor inlet plenum according to claim 1, wherein, The casing front section (1) is a rotary body, one end of which is provided with a first flange (101), and the other end is welded with the air inlet cylinder (3). The center of the casing front section (1) is provided with a second flange (102). The reinforcing ribs extend radially to the inner surface of the outermost side of the casing front section (1) from the second flange (102) as the starting point.

3. A radial compressor inlet plenum according to claim 2, wherein, The second flange (102) is internally provided with a ventilation pipeline (103) and an oil return pipeline (104). The ventilation pipeline (103) is uniformly arranged in the circumferential direction around the air inlet casing axis, the inlet end is located on the outer surface of the second flange (102), and the outlet end is located on the inner surface of the second flange (102). The oil return pipeline (104) is provided with at least one, the inlet end is located on the outer surface of the second flange (102), and the outlet end is located on the inner surface of the second flange (102).

4. A radial compressor inlet plenum according to claim 2, wherein, The reinforcing ribs include first reinforcing ribs (105), second reinforcing ribs (106) and a plurality of third reinforcing ribs (107) which are uniformly distributed in the circumferential direction around the air inlet casing axis.

5. A radial compressor inlet plenum according to claim 4, wherein, The first reinforcing rib (105) is internally provided with a cleaning pipeline (108), the inlet end of the cleaning pipeline (108) is located on the outermost side of the casing front section (1), and the outlet end extends to the inside of the air inlet cylinder (3).

6. A radial compressor inlet plenum according to claim 4, wherein, The second reinforcing rib (106) is internally provided with a second oil supply pipeline (1010) and a third oil supply pipeline (1011). One end of the second oil supply pipeline (1010) is communicated with a first oil supply pipeline (109), and the other end is communicated with the third oil supply pipeline (1011). The first oil supply pipeline (109) is arranged on the end face of the first flange (101). The third oil supply pipeline (1011) is communicated with a fourth oil supply pipeline (1012) at the end away from the second oil supply pipeline (1010), and the fourth oil supply pipeline (1012) is arranged in the second flange (102) in the axial direction of the air inlet casing.

7. A radial compressor inlet plenum according to claim 6, wherein, The second flange (102) is also internally provided with a fifth oil supply pipeline (1013) and an oil film cavity (1014). One end of the fifth oil supply pipeline (1013) is communicated with the fourth oil supply pipeline (1012), and the other end is communicated with the oil film cavity (1014), and the oil film cavity (1014) is arranged on the inner surface of the second flange (102).

8. A radial compressor inlet plenum according to claim 6, wherein, The second flange (102) is also internally provided with an oil injection hole (1015). The second flange (102) is internally provided with an annular front elastic support (4), and the front elastic support (4) is used to close the oil film cavity (1014). The surface of the front elastic support (4) is uniformly provided with a plurality of windows in the circumferential direction, and the oil sprayed out of the oil injection hole (1015) reaches the bearing through the windows.

9. A radial compressor inlet plenum according to claim 8, wherein, The inner surface of the second flange (102) is provided with an annular labyrinth (5) located on the side of the front elastic support (4) and used for sealing the bearing cavity.

10. A radial intake for a compressor according to any one of claims 1 to 9, wherein, The rear section (2) of the casing is a rotary body, one end of which is welded to the end of the air inlet cylinder (3) away from the front section (1) of the casing, and the other end is provided with a third flange (201). The center of the rear section (2) of the casing is provided with a fourth flange (202), and the fourth flange (202) and the third flange (201) are connected through the casing wall of the rear section (2) of the casing.

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