Centrifugal impeller and engine

Abstract

The application relates to the engine technical field and discloses a centrifugal impeller and an engine. The centrifugal impeller comprises a wheel body and a sealing outer cover. The wheel body can rotate along the axial direction, and a channel is arranged in the wheel body and is suitable for passing fluid. The sealing outer cover is arranged on the outer side of the wheel body coaxially with the wheel body, the wheel body rotates relative to the sealing outer cover, and a gas collection cavity is formed between the sealing outer cover and the wheel body. The gas collection cavity is provided with an air inlet and an air outlet, the air inlet is communicated with the channel, and the air outlet is suitable for being communicated with external equipment. The application combines the air guide structure and the sealing outer cover, and solves the problems of complex structure and large weight caused by the additional air guide structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a centrifugal impeller and an engine. BACKGROUND

[0002] As a key component in an aero-engine, the centrifugal impeller can work on the airflow in a closed and contracted passage through the blades to convert mechanical energy into pressure potential energy, thereby realizing the compression of the gas. In a high-pressure and high-temperature environment such as an aero-engine, the performance and stability of the centrifugal impeller directly determine the performance and reliability of the entire engine.

[0003] At present, an open centrifugal impeller is generally used in an aero-engine, which forms a closed and contracted passage through the rotating centrifugal impeller and the stationary impeller cover to realize the compression of the gas. In order to prevent the centrifugal impeller from colliding with the impeller cover, a certain tip clearance is required. For a centrifugal impeller with high tangential velocity, the deformation of the blade tip is large under the high-speed working state, and a larger tip clearance is required to ensure safety, which will cause the airflow loss in the passage to increase, thereby affecting the performance of the compressor. The closed impeller can avoid the performance decline of the compressor caused by the excessive tip clearance, but under the same aerodynamic load condition, the disc core stress of the closed impeller is more severe than that of the open centrifugal impeller, so the closed impeller is not suitable for high tangential speed working state. The prior art proposes a closed centrifugal impeller scheme enhanced by high-strength lightweight composite materials, aiming to reduce the disc stress and improve the allowable strength of the wheel disc, so as to break through the limitation of the tangential speed of the closed centrifugal impeller. At the same time, a compressor structure using sealing cover bleed air is proposed to optimize the gas flow and heat dissipation inside the engine.

[0004] However, the existing bleed air structure is usually arranged at the casing outside the sealing cover, which is not conducive to bleeding air from multiple places of the centrifugal impeller, and increases the weight and complexity of the engine. SUMMARY

[0005] The present application provides a centrifugal impeller and an engine to solve the problems of complex structure and large weight caused by the additional bleed air structure.

[0006] In a first aspect, the present application provides a centrifugal impeller, comprising a wheel body and a sealing cover. The wheel body can rotate along its axial direction, and the wheel body is provided with a passage adapted for the fluid to pass through. The sealing cover is sleeved on the outer side of the wheel body and is coaxially arranged with the wheel body, and a gas collecting cavity is formed between the sealing cover and the wheel body. The gas collecting cavity is provided with an air inlet and an air outlet, the air inlet is communicated with the passage, and the air outlet is adapted to be communicated with an external device.

[0007] Beneficial effects: The airflow in the channel can be introduced into the gas collection chamber through the gas inlet during the flow process. The gas collection chamber collects the collected gas and discharges the gas to other devices with air induction demand through the gas outlet. The additional air induction structure is saved. The problem of complex structure caused by the additional air induction structure is solved. The overall weight is reduced.

[0008] In an alternative embodiment, the gas collection chamber is provided with a sealing assembly at each end of the axial direction of the wheel body. The sealing assembly includes a first sealing ring and a second sealing ring. A plurality of first sealing rings are arranged on the outer circumferential surface of the wheel body in the axial direction of the wheel body. A plurality of second sealing rings are arranged on the inner circumferential surface of the sealing cover in the axial direction of the wheel body. The plurality of first sealing rings and the plurality of second sealing rings are correspondingly arranged.

[0009] Beneficial effects: The sealing assembly not only seals the gas collection chamber, but also cooperates with the sealing cover to prevent the airflow from the wheel body outlet from backflowing to the inlet, ensuring the work efficiency of the centrifugal impeller. The first sealing ring and the second sealing ring are provided with a plurality of first sealing rings and a plurality of second sealing rings, which are correspondingly arranged to achieve multiple sealing of the gas collection chamber.

[0010] In an alternative embodiment, the gas collection chamber is provided with a sealing assembly at each end of the axial direction of the wheel body. The sealing assembly includes a first sealing ring and a second sealing ring. A plurality of first sealing rings are arranged on the outer circumferential surface of the wheel body in the axial direction of the wheel body. A plurality of second sealing rings are arranged on the inner circumferential surface of the sealing cover in the axial direction of the wheel body. The plurality of first sealing rings and the plurality of second sealing rings are correspondingly arranged.

[0011] Beneficial effects: The gas collection chamber is provided with a ring structure, which is sleeved on the outside of the wheel body. This arrangement can introduce all the airflow in the channels of the wheel body into the gas collection chamber along the circumferential direction of the wheel body, achieving full collection of the airflow. Meanwhile, the plurality of gas collection chambers are arranged in the axial direction of the wheel body. The position of the gas inlet of different gas collection chambers in the flow direction can be adjusted according to the characteristics of gradually increasing pressure and temperature of the airflow in the channel along the flow direction.

[0012] In an alternative embodiment, the wheel body includes a reinforcing ring, an outer ring and an inner ring. The outer ring is sleeved on the outside of the inner ring, and the outer ring is connected to the inner ring. The inner ring is provided with an annular groove on the side connected to the outer ring. The reinforcing ring is arranged in the annular groove, and the reinforcing ring abuts against the side wall of the outer ring.

[0013] Beneficial effects: The outer ring and the inner ring are forged into shapes, and the reinforcing ring is arranged between the outer ring and the inner ring. This can improve the overall use strength. The arrangement of the reinforcing ring can reduce the stress of the disc body and improve the allowable strength of the wheel disc. It can break through the limitation of the tangential velocity of the closed centrifugal impeller, and significantly improve the power-to-weight ratio of the engine.

[0014] In an alternative embodiment, the channel is arranged in the outer ring, the sealing outer cover is arranged outside the outer ring, and the outer circumferential surface of the outer ring is protruded towards the sealing outer cover to form the first sealing ring.

[0015] Beneficial effects: The channel is arranged on the outer ring, so that the airflow in the channel can be introduced into the gas collection cavity through the air inlet during the flow process, and the collected gas is collected.

[0016] In an alternative embodiment, the difference between the outer diameter and the inner diameter of the outer ring gradually decreases along a first direction, and the difference between the outer diameter and the inner diameter of each of the inner ring and the reinforcing ring gradually increases along the first direction, and the first direction is parallel to the axial direction of the wheel body.

[0017] Beneficial effects: According to the feature that the diameter of the centrifugal impeller gradually increases along the direction from the inlet to the outlet, the outer ring, the inner ring, and the reinforcing ring are all designed to have a trapezoidal cross-section structure, and the electron beam welding seam is arranged on the abutting end surface of the first initial forging blank and the second initial forging blank, thereby reducing the welding difficulty. The structure and position of the reinforcing ring are determined according to the results of the topology optimization analysis of the closed centrifugal impeller.

[0018] In an alternative embodiment, the outer ring includes a wheel disc, blades, and a wheel cover. A plurality of blades are arranged and spaced apart along the circumferential direction of the wheel disc on the wheel disc. The wheel cover is arranged outside the plurality of blades and connected with the plurality of blades, and two adjacent blades, the wheel disc, and the wheel cover form the channel. The sealing outer cover is arranged outside the wheel cover, and the outer circumferential surface of the wheel cover is protruded towards the sealing outer cover to form the first sealing ring.

[0019] Beneficial effects: Two adjacent blades, the wheel disc, and the wheel cover form the channel, so that the airflow flows axially from the inlet to the outlet in the closed channel, and part of the fluid in the channel can enter the gas collection cavity formed between the sealing outer cover and the wheel body through the air inlet, and then be discharged from the air outlet, thereby achieving the air induction effect.

[0020] In an alternative embodiment, a plurality of air inlets are arranged, and the plurality of air inlets are spaced apart along the circumferential direction of the gas collection cavity, and the plurality of air inlets are respectively arranged one-to-one corresponding to the plurality of channels.

[0021] Beneficial effects: The gas collection cavity is arranged in a ring structure and arranged outside the wheel body, and the plurality of air inlets are arranged to be respectively communicated with the plurality of channels, so that the airflows in all the channels in the wheel body can be introduced into the gas collection cavity along the circumferential direction of the wheel body, thereby achieving the overall collection of the airflows.

[0022] In an alternative embodiment, the reinforcing ring is made of carbon fiber composite material.

[0023] Beneficial effects: The reinforcing ring is arranged in the high stress area of the disc body, and the reinforcing ring is made of carbon fiber composite material with high specific strength, high specific modulus, good high temperature performance and other characteristics, so as to improve the overall strength of the wheel body.

[0024] In a second aspect, the application further provides an engine comprising a casing and a centrifugal impeller, wherein the sealing cover of the centrifugal impeller is connected to the casing.

[0025] Since the engine comprises the centrifugal impeller, the same effects as the centrifugal impeller are achieved, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the application, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0027] Fig. 1 FIG. 1 is a structural schematic diagram of a centrifugal impeller according to an embodiment of the application;

[0028] Fig. 2 FIG. 2 is a structural schematic diagram of a wheel body according to an embodiment of the application;

[0029] Fig. 3 FIG. 3 is a structural schematic diagram of a first initial forging blank and a second initial forging blank according to an embodiment of the application.

[0030] LEGEND OF DRAWINGS

[0031] 1, wheel body; 101, outer ring; 1011, disc; 1012, blade; 1013, wheel cover; 102, reinforcing ring; 103, inner ring; 2, sealing cover; 3, gas collecting cavity; 4, gas inlet; 5, gas outlet; 6, sealing assembly; 6001, first sealing ring; 6002, second sealing ring; 7, first initial forging blank; 8, second initial forging blank; X, first direction. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0033] The embodiments of the present application are described below with reference to the drawings. Figs. 1 to 3 , describes the embodiments of the present application.

[0034] According to the embodiments of the present application, in one aspect, a centrifugal impeller is provided, comprising a wheel body 1 and a sealing cover 2. The wheel body 1 is rotatable along its axial direction, and a channel is arranged in the wheel body 1, which is suitable for passing fluid. The sealing cover 2 is arranged on the outside of the wheel body 1, fixedly connected with other casings on the engine, and coaxially arranged with the wheel body 1, so that the wheel body 1 can rotate relative to the sealing cover 2, and a gas collection cavity 3 is formed between the sealing cover 2 and the wheel body 1. The gas collection cavity 3 is provided with an air inlet 4 and an air outlet 5, the air inlet 4 is communicated with the channel, and the air outlet 5 is suitable for communicating with external equipment.

[0035] It can be understood that the fluid can be gas or liquid, so that the centrifugal impeller can be suitable for different environmental conditions.

[0036] It should be noted that the wheel body 1 can rotate relative to the sealing cover 2, so that the airflow can flow into the channel from the inlet axially and flow out radially from the outlet, and the rotating wheel body 1 does work on the fluid in the channel to increase the pressure. The cooperation between the sealing cover 2 and the wheel body 1 can build the gas collection cavity 3, and the air outlet 5 arranged on the sealing cover 2 and the air inlet 4 arranged on the wheel body 1 can realize the circulation of airflow, that is, the high-temperature and high-pressure gas at the centrifugal impeller can be led out for engine inlet anti-icing, sealing air leading, turbine cooling, aircraft air leading, etc. The existing air leading structure of the compressor is usually arranged at the casing outside the sealing cover 2, which is not conducive to leading air from multiple places of the centrifugal impeller, and also leads to complex structure of the outer casing and increases the weight of the engine.

[0037] In the present embodiment, the airflow in the channel can be introduced into the gas collection cavity 3 through the air inlet 4 during the flow process, the gas collection cavity 3 collects the collected gas, and the gas is discharged to other equipment with air leading demand through the air outlet 5, which saves the additional air leading structure, solves the problem of complex structure caused by the additional air leading structure, and reduces the overall weight.

[0038] In one embodiment, the gas collecting cavity 3 is provided with a sealing assembly 6 at each end along the axial direction of the wheel body 1, and the sealing assembly 6 comprises a first sealing ring 6001 and a second sealing ring 6002. The first sealing ring 6001 is provided with a plurality of first sealing rings 6001 which are spaced apart along the axial direction of the wheel body 1 and arranged on the outer circumferential surface of the wheel body 1. The second sealing ring 6002 is provided with a plurality of second sealing rings 6002 which are spaced apart along the axial direction of the wheel body 1 and arranged on the inner circumferential surface of the sealing outer cover 2. The plurality of first sealing rings 6001 and the plurality of second sealing rings 6002 are correspondingly arranged.

[0039] It should be noted that the first sealing ring 6001 and the second sealing ring 6002 can be provided as stepped sealing bars, and the two groups of sealing outer covers 2 on the wheel body 1 and the sealing outer cover 2 are used in cooperation.

[0040] It can be understood that a dynamic sealing structure can be formed between the plurality of first sealing rings 6001 and the plurality of second sealing rings 6002.

[0041] Alternatively, the second sealing ring 6002 is a sealing ring and the first sealing ring 6001 is a sealing bar. The first sealing ring 6001 and the second sealing ring 6002 can not be completely corresponding in the axial direction, but there is a certain dislocation, that is, they are arranged in interlacing. This arrangement can increase the complexity of the seal and the labyrinth effect, thereby reducing the leakage amount and providing better sealing performance, especially in high-pressure, high-temperature or high-speed rotating environments.

[0042] In this embodiment, the sealing assembly 6 not only seals the gas collecting cavity 3, but also cooperates with the sealing outer cover 2 to prevent the gas flow from the outlet of the wheel body 1 from backflowing to the inlet, thereby ensuring the work efficiency of the centrifugal impeller. The first sealing ring 6001 and the second sealing ring 6002 are provided with a plurality of first sealing rings 6001 and a plurality of second sealing rings 6002, and the plurality of first sealing rings 6001 and the plurality of second sealing rings 6002 are correspondingly arranged, thereby achieving multiple sealing of the gas collecting cavity 3.

[0043] In one embodiment, the gas collecting cavity 3 is provided in a ring structure, and the gas collecting cavity 3 is provided with a plurality of gas collecting cavities 3 which are sequentially arranged along the axial direction of the wheel body 1.

[0044] It can be understood that the plurality of gas collecting cavities 3 are sequentially arranged along the axial direction of the wheel body 1. Therefore, the sealing bleed air, ice prevention bleed air, turbine cooling bleed air, aircraft bleed air and other bleed air requirements of the engine can be obtained from different gas collecting cavities 3 according to the requirements of pressure, temperature, flow rate and the like.

[0045] Alternatively, the gas collecting cavity 3 can be provided in a ring structure, which can ensure the dynamic sealing between the first sealing ring 6001 and the second sealing ring 6002 and can collect the gas flow in each channel.

[0046] In the embodiment, the gas collecting cavity 3 is arranged in a ring structure and is sleeved outside the wheel body 1. In this way, the gas flow in all the channels in the wheel body 1 can be introduced into the gas collecting cavity 3 along the circumferential direction of the wheel body 1, so that the gas flow is fully collected. Meanwhile, the plurality of gas collecting cavities 3 are arranged at intervals along the axial direction of the wheel body 1. According to the characteristics that the gas flow in the channel gradually increases in the flow direction in terms of pressure and temperature, the gas inlet 4 of the different gas collecting cavities 3 can be adjusted in the position in the flow direction to adjust the gas inlet pressure and temperature.

[0047] In an embodiment, the wheel body 1 includes a reinforcing ring 102, an outer ring 101 and an inner ring 103. The outer ring 101 is sleeved outside the inner ring 103, and the outer ring 101 is connected with the inner ring 103. The inner ring 103 is provided with an annular groove on the side connected with the outer ring 101, and the reinforcing ring 102 is arranged in the annular groove and abuts against the side wall of the outer ring 101. The channel is arranged in the outer ring 101, and the sealing cover 2 is sleeved outside the outer ring 101. The outer circumferential surface of the outer ring 101 is protruded to form a first sealing ring 6001 towards the sealing cover 2.

[0048] It should be noted that, compared with the traditional closed centrifugal impeller, the high tangential speed closed centrifugal impeller has higher centrifugal load, temperature load and pressure load. The traditional integral casting forming scheme cannot meet the strength design requirements and the high performance requirements for forming precision. Therefore, in the embodiment, the local reinforcement of the forged composite material and the integral machining method are adopted.

[0049] In the embodiment, the outer ring 101 and the inner ring 103 are respectively forged and formed, and the reinforcing ring 102 is arranged between the outer ring 101 and the inner ring 103. In this way, the overall use strength can be improved. The arrangement of the reinforcing ring 102 can reduce the disc stress and improve the allowable strength of the wheel disc 1011, so that the tangential speed of the closed centrifugal impeller can break through the limit and the power-to-weight ratio of the engine can be significantly improved.

[0050] In an embodiment, the difference between the outer diameter and the inner diameter of the outer ring 101 gradually decreases along the first direction X, and the difference between the outer diameter and the inner diameter of the inner ring 103 and the reinforcing ring 102 gradually increases along the first direction X. The first direction X is parallel to the axial direction of the wheel body 1.

[0051] Alternatively, the cross section of the outer ring 101, the inner ring 103 and the reinforcing ring 102 can be arranged in a trapezoidal structure, and the height of the inner ring 103 and the reinforcing ring 102 gradually increases along the first direction X.

[0052] In the embodiment, according to the feature that the diameter of the centrifugal impeller gradually increases along the direction from the inlet to the outlet, the outer ring 101, the inner ring 103 and the reinforcing ring 102 are all designed as a trapezoidal structure, and the electron beam weld is arranged on the abutting end surface of the first initial forging blank 7 and the second initial forging blank 8, so as to reduce the welding difficulty. The structure and position of the reinforcing ring 102 are determined according to the result of the topology optimization analysis of the closed centrifugal impeller.

[0053] In one embodiment, the outer ring 101 comprises a disc 1011, blades 1012 and a cover 1013. The blades 1012 are provided in plurality, and the plurality of blades 1012 are distributed on the disc 1011 along the circumferential direction of the disc 1011. The cover 1013 is sleeved outside the plurality of blades 1012 and connected with the plurality of blades 1012, and two adjacent blades 1012 and the disc 1011 and the cover 1013 form a channel. The sealing cover 2 is sleeved outside the cover 1013, and the outer peripheral surface of the cover 1013 is protruded to form a first sealing ring 6001 towards the sealing cover 2.

[0054] It should be noted that the blank for processing the wheel body 1 comprises the first initial forging blank 7 and the second initial forging blank 8. The first initial forging blank 7 comprises the disc 1011, the blades 1012 and the cover 1013 for forming the outer ring 101, and the second initial forging blank 8 comprises the inner ring 103. The mounting groove of the reinforcing ring 102 is processed in the corresponding large stress area of the inner ring 103. The reinforcing ring 102 is embedded in the mounting groove, and then the outer ring 101 and the inner ring 103 are combined. The outer ring 101 and the inner ring 103 are fixed by electron beam welding and sealed at the interface. Finally, after consolidation by hot isostatic pressing, the first initial forging blank 7 and the second initial forging blank 8 containing the reinforcing ring 102 form a composite processing blank of the closed centrifugal impeller. Due to the narrow and twisted channel formed by the two adjacent blades 1012 and the disc 1011 and the cover 1013 along the flow direction, it is generally difficult to process by traditional mechanical processing, but it can be precisely processed by new processing forms such as electro-processing, which can meet the use requirements.

[0055] In the embodiment, the two adjacent blades 1012 and the disc 1011 and the cover 1013 form a channel, so that the airflow flows into the closed channel from the inlet axially and flows out from the outlet radially. At the same time, part of the fluid in the channel can enter the matching space between the sealing cover 2 and the wheel body 1 through the gas inlet 4 to form the gas collecting chamber 3, and then be discharged from the gas outlet 5, so as to realize the bleed air effect.

[0056] In one embodiment, the gas inlet 4 is provided in plurality, and the plurality of gas inlets 4 are distributed along the circumference of the gas collecting chamber 3 and correspond to the plurality of channels one by one.

[0057] In the embodiment, the gas collecting cavity 3 is arranged in a ring shape and is sleeved outside the wheel body 1. The plurality of air inlets 4 are respectively communicated with the plurality of channels. The air in the channels of the wheel body 1 is introduced into the gas collecting cavity 3 along the circumferential direction of the wheel body 1, so that the air is fully collected.

[0058] In one embodiment, the wheel disc 1011, the blade 1012, the wheel cover 1013 and the first sealing ring 6001 are configured as an integrated structure.

[0059] In the embodiment, the outer ring 101 of the integrated structure eliminates the gap between the blade 1012 and the wheel cover 1013, avoids the air flow loss caused by the tip clearance, and can better achieve the design requirements of aerodynamic performance and has better structural stability.

[0060] In one embodiment, the centrifugal impeller is formed by forging, i.e., the part blank is a forging, and the wheel disc 1011, the blade 1012, the wheel cover 1013 and the first sealing ring 6001 are formed by machining, so that the machining precision is higher.

[0061] In one embodiment, the centrifugal impeller is formed by forging, so that the mechanical properties of the material are better.

[0062] In one embodiment, the reinforcing ring 102 is made of carbon fiber composite material.

[0063] It should be noted that the wheel body 1 is reinforced by high-strength lightweight composite material, which can reduce the stress of the wheel body 1, improve the allowable strength of the wheel disc 1011, break through the limitation of the tangential velocity of the closed centrifugal impeller, and significantly improve the power-to-weight ratio of the engine.

[0064] In the embodiment, the reinforcing ring 102 is arranged in the high stress area of the disc body, and the reinforcing ring 102 is made of carbon fiber composite material having high specific strength, high specific modulus and good high temperature performance, so as to improve the overall strength of the wheel body 1.

[0065] According to the embodiment of the application, in another aspect, an engine is also provided, which comprises a casing and a centrifugal impeller, and the sealing cover 2 of the centrifugal impeller is connected with the casing.

[0066] Since the engine comprises the centrifugal impeller, it has the same effects as the centrifugal impeller, which will not be described here.

[0067] Although the embodiments of the application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A centrifugal impeller, characterized in that, include: The wheel (1) is rotatable along its axial direction, and a channel is provided inside the wheel (1) for fluid to pass through; A sealing cover (2) is fitted on the outside of the wheel body (1) and is coaxially arranged with the wheel body (1). An air collection chamber (3) is formed between the sealing cover (2) and the wheel body (1). The gas collecting chamber (3) is provided with an air inlet (4) and an air outlet (5). The air inlet (4) is connected to the channel, and the air outlet (5) is suitable for connecting to external devices. The gas collecting chamber (3) is provided with sealing assemblies (6) at both ends along the axial direction of the wheel body (1), and the sealing assembly (6) includes: Multiple first sealing rings (6001) are provided, and the multiple first sealing rings (6001) are distributed at intervals along the axial direction of the wheel body (1) on the outer peripheral surface of the wheel body (1); Multiple second sealing rings (6002) are provided, and the multiple second sealing rings (6002) are distributed at intervals along the axial direction of the wheel body (1) on the inner circumferential surface of the sealing cover (2); The plurality of first sealing rings (6001) and the plurality of second sealing rings (6002) are respectively provided.

2. The centrifugal impeller according to claim 1, characterized in that, The air collection chamber (3) is configured as a ring structure, and there are multiple air collection chambers (3), which are distributed sequentially along the axial direction of the wheel body (1).

3. The centrifugal impeller according to claim 1, characterized in that, The wheel body (1) includes: Reinforcing ring (102); An outer ring (101) and an inner ring (103) are provided. The outer ring (101) is sleeved on the outside of the inner ring (103) and is connected to the inner ring (103). The inner ring (103) has an annular groove on the side connected to the outer ring (101). A reinforcing ring (102) is disposed in the annular groove and abuts against the side wall of the outer ring (101).

4. The centrifugal impeller according to claim 3, characterized in that, The channel is disposed in the outer ring (101), and the sealing cover (2) is sleeved on the outside of the outer ring (101). The outer peripheral surface of the outer ring (101) protrudes towards the sealing cover (2) to form the first sealing ring (6001).

5. The centrifugal impeller according to claim 3, characterized in that, The difference between the outer diameter and the inner diameter of the outer ring (101) gradually decreases along the first direction (X), and the difference between the outer diameter and the inner diameter of the inner ring (103) and the reinforcing ring (102) gradually increases along the first direction (X). The first direction (X) is parallel to the axial direction of the wheel body (1).

6. The centrifugal impeller according to claim 3, characterized in that, The outer ring (101) includes: Roulette (1011); Multiple blades (1012) are spaced apart on the disk (1011) along the circumference of the disk (1011); A wheel cover (1013) is fitted on the outside of a plurality of blades (1012) and connected to the plurality of blades (1012). Two adjacent blades (1012), the wheel disk (1011), and the wheel cover (1013) form the channel. The sealing cover (2) is fitted on the outside of the wheel cover (1013), and the outer peripheral surface of the wheel cover (1013) protrudes towards the sealing cover (2) to form the first sealing ring (6001).

7. The centrifugal impeller according to claim 5, characterized in that, The air inlet (4) is provided in multiple ways. The multiple air inlets (4) are distributed at intervals along the circumference of the air collection chamber (3), and the multiple air inlets (4) are respectively provided in correspondence with the multiple channels.

8. The centrifugal impeller according to claim 4, characterized in that, The reinforcing ring (102) is made of carbon fiber composite material.

9. An engine, characterized in that, include: Casing; The centrifugal impeller according to any one of claims 1 to 8, wherein the sealing outer cover (2) of the centrifugal impeller is connected to the casing.

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