Centrifugal impeller and engine

Abstract

The invention relates to the technical field of engines, and discloses a centrifugal impeller and an engine, and the centrifugal impeller comprises an impeller body and a sealing outer cover. The wheel body can rotate in the axial direction of the wheel body, a channel is formed in the wheel body, and the channel is suitable for fluid to pass through. The sealing outer cover is arranged on the outer side of the wheel body in a sleeving mode, the sealing outer cover and the wheel body are coaxially arranged, 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. Wherein the gas collecting cavity is provided with a gas inlet and a gas outlet, the gas inlet is communicated with the channel, and the gas outlet is suitable for being communicated with external equipment. The air entraining structure and the sealing outer cover can be combined, and the problems that due to the fact that the air entraining structure is additionally arranged, the structure is complex, and the weight is large are solved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a centrifugal impeller and an engine. Background Art

[0002] As a key component in aircraft engines, centrifugal impellers can convert mechanical energy into pressure potential energy by using blades to work on the airflow in a closed contraction channel, thereby achieving gas compression. In high-pressure and high-temperature environments such as aircraft engines, the performance and stability of centrifugal impellers directly determine the performance and reliability of the entire engine.

[0003] At present, open centrifugal impellers are widely used in aircraft engines. A closed contraction channel is formed by a rotating centrifugal impeller and a stationary impeller cover to achieve gas compression. In order to prevent the collision between the centrifugal impeller and the impeller cover, a certain tip clearance needs to be left. For centrifugal impellers with high tangential speeds, due to the large deformation of the blade tip under high speed working conditions, a larger tip clearance is required to ensure safe use, which will increase the air flow loss in the channel, thereby affecting the performance of the compressor. The closed impeller can avoid the degradation of compressor performance caused by excessive tip clearance, but under the same aerodynamic load conditions, the force on its disc center is worse than that on the open centrifugal impeller. Therefore, the closed impeller is not suitable for working conditions with high tangential speeds. The prior art proposes a closed centrifugal impeller scheme reinforced with high-strength and lightweight composite materials, aiming to reduce the stress of the disc body and increase the allowable strength of the wheel disc to break through the tangential speed limit of the closed centrifugal impeller. At the same time, a compressor structure using a sealed cover to bleed air is also proposed to optimize the gas flow and heat dissipation inside the engine.

[0004] However, the existing air intake structure is usually arranged at the casing outside the sealed outer cover, which is not conducive to the air intake from multiple locations of the centrifugal impeller and increases the weight and complexity of the engine. Summary of the invention

[0005] The present application provides a centrifugal impeller and an engine to solve the problems of complex structure and heavy weight caused by the additional provision of an air induction 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 a channel is provided in the wheel body, and the channel is suitable for 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 an air collecting chamber is formed between the sealing cover and the wheel body. The air collecting chamber is provided with an air inlet and an air outlet, the air inlet is connected to the channel, and the air outlet is suitable for connecting to an external device.

[0007] Beneficial effects: The airflow in the channel can enter the gas collecting chamber through the air inlet during the flow process. The gas collecting chamber collects the collected gas and discharges the gas to other equipment with air entrainment requirements through the air outlet, eliminating the need for an additional air entrainment structure, solving the problem of complex structure caused by the additional air entrainment structure, and reducing the overall weight.

[0008] In an optional embodiment, the gas collecting chamber is provided with sealing components at both ends of the axial direction of the wheel body, and the sealing components include a first sealing ring and a second sealing ring. A plurality of first sealing rings are provided, and the plurality of first sealing rings are distributed on the outer peripheral surface of the wheel body at intervals along the axial direction of the wheel body. A plurality of second sealing rings are provided, and the plurality of second sealing rings are distributed on the inner peripheral surface of the sealing cover at intervals along the axial direction of the wheel body. The plurality of first sealing rings and the plurality of second sealing rings are provided correspondingly.

[0009] Beneficial effect: The sealing assembly can not only seal the air collecting cavity, but also cooperate with the sealing cover to prevent the airflow from the air outlet of the wheel body from flowing back to the inlet, thereby ensuring the working efficiency of the centrifugal impeller. Multiple first sealing rings and multiple second sealing rings are provided, and multiple sealing of the air collecting cavity can be achieved by correspondingly providing multiple first sealing rings and multiple second sealing rings.

[0010] In an optional embodiment, the air collecting chamber is configured as an annular structure, and a plurality of the air collecting chambers are provided, and the plurality of air collecting chambers are distributed in sequence along the axial direction of the wheel body.

[0011] Beneficial effect: The air collecting chamber is set as an annular structure, which is sleeved on the outside of the wheel body. In this way, the airflow in all channels in the wheel body can be introduced into the air collecting chamber along the circumference of the wheel body, so as to achieve comprehensive collection of airflow. At the same time, multiple air collecting chambers are arranged at intervals along the axial direction of the wheel body. According to the characteristics that the pressure and temperature of the airflow in the channel gradually increase along the streamline direction, the air intake pressure and temperature can be adjusted by adjusting the positions of the air inlets of different air collecting chambers in the streamline direction.

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

[0013] Beneficial effects: The outer ring and the inner ring are forged separately, and a reinforcement ring is set between the outer ring and the inner ring to improve the overall strength of use. The reinforcement ring can reduce the stress of the disc body, increase the allowable strength of the wheel disc, and break through the tangential speed limit of the closed centrifugal impeller, significantly improving the power-to-weight ratio of the engine.

[0014] In an optional embodiment, the channel is arranged in the outer ring, the sealing cover is sleeved on the outside of the outer ring, and the outer peripheral surface of the outer ring protrudes toward the sealing cover to form the first sealing ring.

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

[0016] In an optional 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 the inner ring and the reinforcement 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 characteristic that the diameter of the centrifugal impeller gradually increases from the inlet to the outlet, the outer ring, inner ring and reinforcing ring are all designed to have a trapezoidal cross-section structure, and the electron beam weld position is set on the abutting end surface of the first initial forging blank and the second initial forging blank to reduce the welding difficulty. Among them, the structure and position of the reinforcing ring are determined according to the results of the topological optimization analysis of the closed centrifugal impeller.

[0018] In an optional embodiment, the outer ring includes a wheel disc, blades and a wheel cover. A plurality of blades are provided, and the plurality of blades are spaced apart on the wheel disc along the circumference of the wheel disc. The wheel cover is sleeved on the outer side of the plurality of blades and connected to the plurality of blades, and two adjacent blades, the wheel disc and the wheel cover form the channel. The sealing cover is sleeved on the outer side of the wheel cover, and the outer peripheral surface of the wheel cover protrudes toward the sealing cover to form the first sealing ring.

[0019] Beneficial effect: The two adjacent blades, the wheel disc and the wheel cover form the channel, so that the air flow flows in axially from the inlet in the closed channel and flows out radially from the outlet. At the same time, part of the fluid in the channel can enter through the air inlet into the air collecting cavity constructed by the cooperation between the sealed outer cover and the wheel body, and then be discharged from the air outlet, thereby achieving the air induction effect.

[0020] In an optional embodiment, a plurality of the air inlets are provided, the plurality of the air inlets are distributed at intervals along the circumference of the air collecting cavity, and the plurality of the air inlets are respectively provided in one-to-one correspondence with the plurality of the channels.

[0021] Beneficial effect: The air collecting chamber is set as an annular structure, which is sleeved on the outside of the wheel body. At the same time, multiple air inlets can be connected to multiple channels respectively. This arrangement can introduce the airflow in all channels in the wheel body into the air collecting chamber along the circumference of the wheel body, thereby realizing comprehensive collection of airflow.

[0022] In an optional embodiment, the reinforcement ring is configured as a carbon fiber composite material.

[0023] Beneficial effect: The reinforcement ring is arranged in the high stress area of ​​the disc body, and the reinforcement ring is set to a carbon fiber composite material with the characteristics of high specific strength, high specific modulus, good high temperature performance, etc., so as to improve the overall strength of the wheel body.

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

[0025] Since the engine includes a centrifugal impeller, it has the same effect as the centrifugal impeller and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of a centrifugal impeller according to an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the structure of the wheel body in the embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of the structure of the first initial forging blank and the second initial forging blank in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Wheel body; 101. Outer ring; 1011. Wheel disc; 1012. Blades; 1013. Wheel cover; 102. Reinforcement ring; 103. Inner ring; 2. Sealing cover; 3. Air collecting chamber; 4. Air inlet; 5. Air 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 purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0033] Combine the following Figures 1 to 3 , describing an embodiment of the present application.

[0034] According to an embodiment of the present application, on the one hand, a centrifugal impeller is provided, comprising a wheel body 1 and a sealing cover 2. The wheel body 1 can rotate along its axial direction, and a channel is provided inside the wheel body 1, and the channel is suitable for fluid to pass through. The sealing cover 2 is sleeved on the outside of the wheel body 1, fixedly connected to 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 an air collecting chamber 3 is formed between the sealing cover 2 and the wheel body 1. Among them, the air 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 an external device.

[0035] It can be understood that the fluid can be gas or liquid, so that the centrifugal impeller can be adapted to 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 axially from the inlet and flow out radially from the outlet, and the rotating wheel body 1 works to increase the pressure of the fluid in the channel. The cooperation between the sealing cover 2 and the wheel body 1 can construct an air collecting chamber 3, and the air outlet 5 provided on the sealing cover 2 and the air inlet 4 provided 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 drawn out for engine inlet anti-icing, sealing air bleed, turbine cooling, aircraft air bleed, etc. The existing compressor bleed structure is usually arranged at the casing outside the sealing cover 2, which is not conducive to bleed air from multiple places of the centrifugal impeller, and also makes the structure of the outer casing complicated, and increases the weight of the engine.

[0037] In this embodiment, the air flow in the channel can enter the air collecting chamber 3 through the air inlet 4 during the flow process. The air collecting chamber 3 collects the collected gas and discharges the gas to other equipment with air entrainment requirements through the air outlet 5, eliminating the need for an additional air entrainment structure, solving the problem of structural complexity caused by the additional air entrainment structure, and reducing the overall weight.

[0038] In one embodiment, sealing assemblies 6 are respectively provided at both ends of the air collecting chamber 3 along the axial direction of the wheel body 1, and the sealing assemblies 6 include a first sealing ring 6001 and a second sealing ring 6002. A plurality of first sealing rings 6001 are provided, and the plurality of first sealing rings 6001 are distributed on the outer peripheral surface of the wheel body 1 at intervals along the axial direction of the wheel body 1. A plurality of second sealing rings 6002 are provided, and the plurality of second sealing rings 6002 are distributed on the inner peripheral surface of the sealing cover 2 at intervals along the axial direction of the wheel body 1. Among them, the plurality of first sealing rings 6001 and the second sealing rings 6002 are respectively provided correspondingly.

[0039] It should be noted that the first sealing ring 6001 and the second sealing ring 6002 can both be configured as stepped sealing comb teeth, and the two sets of sealing covers 2 respectively located on the wheel body 1 and the sealing cover 2 are used in conjunction with each other.

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

[0041] Optionally, the second sealing ring 6002 is a sealing ring and the first sealing ring 6001 is a sealing comb, and the first sealing ring 6001 and the second sealing ring 6002 may not completely correspond to each other in the axial direction, but may be misaligned to a certain extent, that is, they are arranged in an interlaced manner. This arrangement can increase the complexity of the seal and the labyrinth effect, thereby reducing the leakage, and can provide better sealing performance, especially in an environment of high pressure, high temperature or high-speed rotation.

[0042] In this embodiment, the sealing assembly 6 can not only seal the gas collecting chamber 3, but also cooperate with the sealing cover 2 to prevent the airflow from the air outlet 5 of the wheel body 1 from flowing back to the inlet due to the pressurization effect of the centrifugal impeller, so as to ensure the working efficiency of the centrifugal impeller. Multiple first sealing rings 6001 and second sealing rings 6002 are provided, and multiple sealing of the gas collecting chamber 3 can be achieved by correspondingly providing multiple first sealing rings 6001 and multiple second sealing rings 6002.

[0043] In one embodiment, the air collecting chamber 3 is configured as an annular structure, and a plurality of air collecting chambers 3 are provided, and the plurality of air collecting chambers 3 are sequentially distributed along the axial direction of the wheel body 1 .

[0044] It can be understood that multiple air collecting cavities 3 are distributed in sequence along the axial direction of the wheel body 1. Therefore, the engine's sealing air bleed, anti-icing air bleed, turbine cooling air bleed, aircraft air bleed and other air bleed needs can be bleed from different air collecting cavities 3 according to pressure, temperature, flow and other requirements.

[0045] Optionally, the gas collecting cavity 3 may be configured as a ring-like structure to ensure dynamic sealing between the first sealing ring 6001 and the second sealing ring 6002 and to be able to collect the airflow in each channel.

[0046] In this embodiment, the gas collecting chamber 3 is set as an annular structure, so that it is sleeved on the outside of the wheel body 1. In this way, the airflow in all channels in the wheel body 1 can be introduced into the gas collecting chamber 3 along the circumference of the wheel body 1, so as to achieve comprehensive collection of airflow. At the same time, multiple gas collecting chambers 3 are arranged at intervals along the axial direction of the wheel body 1. According to the characteristics that the pressure and temperature of the airflow in the channel gradually increase along the streamline direction, the air intake pressure and temperature can be adjusted by adjusting the positions of the air inlets 4 of different gas collecting chambers 3 in the streamline direction.

[0047] In one embodiment, the wheel body 1 includes a reinforcement ring 102, an outer ring 101 and an inner ring 103. The outer ring 101 is sleeved on the outer side of the inner ring 103, and the outer ring 101 is connected to the inner ring 103. The inner ring 103 is provided with an annular groove on the side connected to the outer ring 101. The reinforcement ring 102 is arranged in the annular groove, and the reinforcement ring 102 abuts against the side wall of the outer ring 101. Among them, the channel is arranged in the outer ring 101, the sealing cover 2 is sleeved on the outer side of the outer ring 101, and the outer peripheral surface of the outer ring 101 protrudes toward the sealing cover 2 to form a first sealing ring 6001.

[0048] It should be noted that, compared with traditional closed centrifugal impellers, high tangential speed closed centrifugal impellers have higher centrifugal loads, temperature loads and pressure loads. The traditional integral casting molding scheme is difficult to meet the strength design requirements and high performance requirements for molding accuracy. Therefore, this embodiment adopts the method of local reinforcement of forging composite materials and overall machining.

[0049] In this embodiment, the overall strength of use can be improved by forging the outer ring 101 and the inner ring 103 separately and providing a reinforcement ring 102 between the outer ring 101 and the inner ring 103. The provision of the reinforcement ring 102 can reduce the stress of the disc body and increase the allowable strength of the wheel disc 1011, which can break through the tangential speed limit of the closed centrifugal impeller and significantly improve the power-to-weight ratio of the engine.

[0050] In one 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 reinforcement ring 102 gradually increases along the first direction X, and the first direction X is parallel to the axial direction of the wheel body 1.

[0051] Optionally, the cross-sections of the outer ring 101 , the inner ring 103 and the reinforcement ring 102 may be set to a trapezoidal structure, and the heights of the inner ring 103 and the reinforcement ring 102 gradually increase along the first direction X.

[0052] In this embodiment, according to the characteristic that the diameter of the centrifugal impeller gradually increases from the inlet to the outlet, the outer ring 101, the inner ring 103, and the reinforcing ring 102 are all designed to have a trapezoidal cross-section, and the electron beam weld position is set on the abutting end surface of the first initial forging blank 7 and the second initial forging blank 8 to reduce the welding difficulty. Among them, the structure and position of the reinforcing ring 102 are determined according to the results of the closed centrifugal impeller topology optimization analysis.

[0053] In one embodiment, the outer ring 101 includes a wheel disc 1011, blades 1012 and a wheel cover 1013. A plurality of blades 1012 are provided, and the plurality of blades 1012 are spaced apart on the wheel disc 1011 along the circumference of the wheel disc 1011. The wheel cover 1013 is sleeved on the outer side of the plurality of blades 1012 and connected to the plurality of blades 1012, and two adjacent blades 1012, the wheel disc 1011 and the wheel cover 1013 form a channel. The sealing cover 2 is sleeved on the outer side of the wheel cover 1013, and the outer peripheral surface of the wheel cover 1013 protrudes toward the sealing cover 2 to form a first sealing ring 6001.

[0054] It should be noted that the blank used for processing the wheel body 1 includes a first initial forging blank 7 and a second initial forging blank 8. The first initial forging blank 7 includes a wheel disc 1011, blades 1012 and a wheel cover 1013 for constituting an outer ring 101. The second initial forging blank 8 includes an inner ring 103. The mounting groove of the reinforcement ring 102 is processed in the corresponding high stress area of ​​the inner ring 103. The reinforcement 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 the interface is sealed. Finally, after hot isostatic pressing and consolidation, the first initial forging blank 7 and the second initial forging blank 8 containing the reinforcement ring 102 are obtained to form a processing blank for a closed centrifugal impeller. Since the channel enclosed by two adjacent blades 1012, the wheel disc 1011 and the wheel cover 1013 is narrow and twisted along the flow direction, it is generally difficult to process it through traditional mechanical processing. However, it can be precisely processed through new processing methods such as electrical processing to meet the use requirements.

[0055] In this embodiment, two adjacent blades 1012, the wheel disc 1011 and the wheel cover 1013 form a channel, so that the air flow flows in axially from the inlet in the closed channel and flows out radially from the outlet. At the same time, part of the fluid in the channel can enter through the air inlet 4 into the air collecting chamber 3 constructed by the cooperation between the sealing outer cover 2 and the wheel body 1, and then be discharged from the air outlet 5, thereby achieving the air induction effect.

[0056] In one embodiment, a plurality of air inlets 4 are provided, and the plurality of air inlets 4 are distributed at intervals along the circumference of the air collecting cavity 3 , and the plurality of air inlets 4 are respectively provided in one-to-one correspondence with the plurality of channels.

[0057] In this embodiment, the air collecting chamber 3 is set as an annular structure, which is arranged on the outside of the wheel body 1. At the same time, multiple air inlets 4 can be connected to multiple channels respectively. This arrangement can introduce the airflow in all channels in the wheel body 1 into the air collecting chamber 3 along the circumference of the wheel body 1, thereby realizing comprehensive collection of airflow.

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

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

[0060] In one embodiment, the centrifugal impeller is formed as a whole by forging, that is, the part blank is a forging, and the wheel disc 1011, the blades 1012, the wheel cover 1013 and the first sealing ring 6001 are formed by mechanical processing, which can achieve higher processing accuracy.

[0061] In one embodiment, the centrifugal impeller is made of forgings, which can improve the mechanical properties of the material.

[0062] In one embodiment, the reinforcement ring 102 is configured as a carbon fiber composite material.

[0063] It should be noted that the wheel body 1 is reinforced with high-strength lightweight composite materials as a whole, which can reduce the stress of the wheel body 1, increase the allowable strength of the wheel disc 1011, and enable the tangential speed of the closed centrifugal impeller to break through the limit, thereby significantly improving the power-to-weight ratio of the engine.

[0064] In this embodiment, the reinforcement ring 102 is arranged in the high stress area of ​​the disc body, and is configured as a carbon fiber composite material with high specific strength, high specific modulus, good high temperature performance, etc., to improve the overall strength of the wheel body 1.

[0065] According to an embodiment of the present application, on the other hand, an engine is provided, including a casing and a centrifugal impeller, wherein a sealing cover 2 of the centrifugal impeller is connected to the casing.

[0066] Since the engine includes a centrifugal impeller, it has the same effect as the centrifugal impeller and will not be described in detail here.

[0067] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A centrifugal impeller, characterized in that: include: A wheel body (1) is rotatable along its axial direction, and a channel is provided inside the wheel body (1), wherein the channel is suitable for allowing fluid to pass through; A sealing cover (2) is sleeved on the outer side of the wheel body (1) and is coaxially arranged with the wheel body (1), and an air collecting 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 an external device.

2. The centrifugal impeller according to claim 1, characterized in that: The air collecting chamber (3) is provided with sealing components (6) at both ends along the axial direction of the wheel body (1), and the sealing components (6) include: A plurality of first sealing rings (6001) are provided, and the plurality of first sealing rings (6001) are distributed on the outer peripheral surface of the wheel body (1) at intervals along the axial direction of the wheel body (1); A plurality of second sealing rings (6002) are provided, and the plurality of second sealing rings (6002) are distributed on the inner circumferential surface of the sealing cover (2) at intervals along the axial direction of the wheel body (1); Wherein, a plurality of the first sealing rings (6001) and a plurality of the second sealing rings (6002) are respectively arranged correspondingly.

3. The centrifugal impeller according to claim 1, characterized in that: The air collecting chamber (3) is arranged as an annular structure, and a plurality of the air collecting chambers (3) are arranged, and the plurality of air collecting chambers (3) are distributed in sequence along the axial direction of the wheel body (1).

4. The centrifugal impeller according to claim 2, characterized in that: The wheel body (1) comprises: A reinforcing ring (102); An outer ring (101) and an inner ring (103), wherein the outer ring (101) is sleeved on the outer side of the inner ring (103), and the outer ring (101) is connected to the inner ring (103); an annular groove is provided on a side of the inner ring (103) that is connected to the outer ring (101); the reinforcement ring (102) is arranged in the annular groove, and the reinforcement ring (102) abuts against the side wall of the outer ring (101).

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

6. The centrifugal impeller according to claim 4, characterized in that: The difference between the outer diameter and the inner diameter of the outer ring (101) gradually decreases along a first direction (X), and the difference between the outer diameter and the inner diameter of each of the inner ring (103) and the reinforcement ring (102) gradually increases along the first direction (X), and the first direction (X) is parallel to the axial direction of the wheel body (1).

7. The centrifugal impeller according to claim 4, characterized in that: The outer ring (101) comprises: Roulette (1011); A plurality of blades (1012) are distributed on the wheel disc (1011) at intervals along the circumference of the wheel disc (1011); a wheel cover (1013) which is sleeved on the outer sides of the plurality of blades (1012) and connected to the plurality of blades (1012); two adjacent blades (1012), the wheel disc (1011) and the wheel cover (1013) enclose the channel; The sealing outer cover (2) is sleeved on the outer side of the wheel cover (1013), and the outer peripheral surface of the wheel cover (1013) protrudes toward the sealing outer cover (2) to form the first sealing ring (6001).

8. The centrifugal impeller according to claim 6, characterized in that: A plurality of the air inlets (4) are provided, the plurality of the air inlets (4) are distributed at intervals along the circumference of the air collecting cavity (3), and the plurality of the air inlets (4) are respectively provided in one-to-one correspondence with the plurality of the channels.

9. The centrifugal impeller according to claim 5, characterized in that: The reinforcement ring (102) is configured as a carbon fiber composite material.

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

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