Axial flow electronic centrifugal compressor

Abstract

The present invention discloses a cooling structure for an electric supercharger, comprising a casing, a high-speed electric motor, an air inlet, and a compressor impeller. The high-speed electric motor is disposed within the casing, the air inlet is configured at one end of the casing, at least a portion of the compressor impeller is located within the air inlet, the compressor impeller is fixed to the rotor shaft of the high-speed electric motor, and a first channel is formed between the high-speed electric motor and the casing; the cooling structure also comprises a vaned diffuser, the vaned diffuser is fixed to the casing, the high-speed electric motor is fixed to the vaned diffuser, the vaned diffuser cooperates with the compressor impeller, and the vaned diffuser is provided with a guide groove for guiding compressed gas into the first channel; a first guide assembly is located within the casing and directs airflow along the axial direction of the casing, the first guide assembly cooperates with the casing and / or the high-speed electric motor. The present invention has the advantages of small size, light weight, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, in particular to an axial-flow electronic centrifugal compressor. Background Art

[0002] CN110299787A discloses an electric supercharger, including a rear bearing, a front bearing, a rotating shaft, a compressor impeller, an electric motor, an inverter, and a cooling structure. The rear bearing is installed in a bearing housing, the front bearing is installed on a front bearing seat, one end of the rotating shaft is matched with the rear bearing, and the other end of the rotating shaft passes through the front bearing and is connected to the compressor impeller. The electric motor is located in the motor housing and a portion of it is installed on the rotating shaft. The inverter is located in the inverter housing and is fixed to the inverter housing. The inverter is also electrically connected to the electric motor.

[0003] For the electric supercharger of the above structure, the cooling structure configured therein is water cooling, which is composed of an inner housing, an outer housing sleeved on the bearing housing and the motor housing, and a heat-conducting end cover with an annular inner cavity. The structure of each part is not only very complex, but also very large in size, and the product is heavy.

[0004] In addition, the electric supercharger in the prior art is provided with a compressor housing at the air intake end. After the compressor housing is matched with the heat-conducting end cover, a diffusion cavity is formed between the compressor housing and the heat-conducting end cover. The compressor impeller is located in the compressor housing and is connected to the rotating shaft. A diffusion channel is connected to the compressor housing, and the diffusion channel is arranged along a nearly spiral path. When the air enters the interior of the compressor housing from the input port of the compressor housing and is compressed by the compressor impeller, the compressed air flows into the diffusion channel along the diffusion cavity, and is then output from the diffusion channel to the required place, such as the combustion chamber of a car.

[0005] As for the diffuser passage on the compressor housing, it also increases the volume and weight of the electric supercharger. Summary of the Invention

[0006] The present invention provides an axial flow electronic centrifugal compressor with small size, light weight and low cost.

[0007] The technical solutions to the above technical problems are as follows:

[0008] An axial-flow electronic centrifugal compressor comprises a casing, a high-speed electric motor, an air inlet, and a compressor impeller, wherein the high-speed electric motor is disposed within the casing, the air inlet is disposed at one end of the casing, at least a portion of the compressor impeller is located within the air inlet, the compressor impeller is fixed to a rotor shaft of the high-speed electric motor, and a first passage is formed between the high-speed electric motor and the casing;

[0009] The compressor further includes a vaned diffuser, the vaned diffuser being fixed to the casing, the high-speed electric motor being fixed to the vaned diffuser, the vaned diffuser being engaged with the compressor impeller, the vaned diffuser being provided with a guide groove for guiding the compressed gas into the first channel;

[0010] A first flow guide component is located in the casing and enables the airflow to flow along the axial direction of the casing. The first flow guide component cooperates with the casing and / or the high-speed electric motor.

[0011] The present invention allows the compressed gas generated by the compressor impeller to enter the casing through the structure of the vaned diffuser, and guides the airflow entering the casing through the first guide component, so that the airflow flows in the axial direction, avoids airflow turbulence and reduces losses. The first guide component also transfers the heat generated by the high-speed electric motor to the casing. Due to the rapid flow of the airflow, the airflow exchanges heat with the first guide component and the casing. Thereby, the heat transfer effect of the first guide component increases the area of heat dissipation, and the heat exchange effect with the fast-flowing airflow enables the high-speed electric motor in the present invention to be quickly cooled, so there is no need to cool the high-speed electric motor through a water cooling structure.

[0012] In addition, the present invention utilizes the structure of a vaned diffuser to form a diffusion channel, and then utilizes the structure of the first channel and the first flow guide assembly to guide and output the airflow. Compared with the electric supercharger in the background technology, the present invention does not require the provision of components such as a heat-conducting end cover and a spiral diffusion channel.

[0013] In addition, the guide heat sink at the air outlet, in addition to guiding the compressed air, also has the function of axially and circumferentially positioning the high-speed electric motor. At the same time, after being connected and fixed to the high-speed electric motor, it is made of specific materials and can also act as a cooling fin, enhancing heat conduction and cooling of the high-speed electric motor.

[0014] Taking the above factors into consideration, it can be seen that the present invention not only reduces the volume and weight, but also reduces the cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of an axial-flow electronic centrifugal compressor according to the present invention;

[0016] Figure 2 is a cross-sectional view of a first axial-flow electronic centrifugal compressor of the present invention;

[0017] Figure 3 for Figure 2 A cross-sectional view of the receiver in FIG.

[0018] Figure 4 for Figure 2 A three-dimensional diagram of the air intake duct;

[0019] Figure 5 for Figure 2 A perspective view of the air intake in another direction;

[0020] Figure 6 for Figure 2 A perspective view of the vaned diffuser in FIG;

[0021] Figure 7 This is a schematic diagram of the first type of axial-flow electronic centrifugal compressor in use;

[0022] Figure 8 is a cross-sectional view of a second axial-flow electronic centrifugal compressor of the present invention;

[0023] Figure 9 is a cross-sectional view of a third axial-flow electronic centrifugal compressor of the present invention;

[0024] Symbols in the accompanying drawings:

[0025] Casing 1, first passage 1a, housing 10, annular mounting portion 11, sealing component 12, first radial extension portion 13, extension portion body 13a, protrusion 13b;

[0026] High-speed electric motor 2;

[0027] Air inlet duct 3, guide cylinder 30, second radial extension portion 31, annular boss 32, accommodating portion 33;

[0028] Compressor impeller 4;

[0029] Vaned diffuser 5, guide groove 5a, disc body 50, recessed portion 50a, diffuser component 51, axial protrusion 51a, radial protrusion 51b, diffuser channel 52, first mounting hole 53, second mounting hole 54;

[0030] Second guide plate 6;

[0031] The heat-conducting fins 70 , the heat-conducting channels 71 , the heat-conducting support components 72 , and the heat-conducting strips 73 . DETAILED DESCRIPTION

[0032] like Figures 1 to 6 As shown, the axial-flow electronic centrifugal compressor includes a casing 1, a high-speed electric motor 2, an air inlet 3, a compressor impeller 4, a vaned diffuser 5, and a first guide assembly. The following describes each part and the relationship between them in detail:

[0033] like Figures 1 to 6As shown, the casing 1 includes a hollow shell 10 with openings at both ends, and an intermediate connecting assembly. The intermediate connecting assembly includes an annular mounting portion 11, a sealing component 12, and a first radial extension portion 13. An annular groove is provided on the outer peripheral surface of the annular mounting portion 11, and the sealing component 12 cooperates with the annular groove. After at least a portion of the annular mounting portion 11 is located in the shell 10 and is fixed to the shell 10, the sealing component 12 forms a seal between the shell 10 and the annular mounting portion 11. The first radial extension portion 13 is located in the annular mounting portion 11 and is fixed to the annular mounting portion 11. The first radial extension portion 13 is fixed to the air inlet 3 and the vaned diffuser 5.

[0034] like Figures 1 to 6 As shown, in this embodiment, threaded holes are provided on the circumferential surfaces of the shell 10 and the annular mounting portion 11. After the annular mounting portion 11 is inserted into the interior of the shell 10, the threaded holes on the shell 10 and the annular mounting portion 11 are threadedly connected using screws to fix the shell 10 and the annular mounting portion 11 into one.

[0035] like Figures 1 to 6 As shown, the sealing component 12 is an annular sealing ring. Since the sealing component 12 is located in the annular groove on the outer peripheral surface of the annular mounting portion 11, when the shell 10 and the annular mounting portion 11 are tightened, the sealing component 12 is pressed between the shell 10 and the annular mounting portion 11, thereby forming a seal on the gap between the shell 10 and the annular mounting portion 11.

[0036] like Figures 1 to 6 As shown, since the first radial extension portion 13 directly or indirectly supports the high-speed electric motor 2, the air inlet duct 3, the compressor impeller 4, and the vaned diffuser 5, the first radial extension portion 13 serves as the main supporting component. In this embodiment, after the first radial extension portion 13 is combined with the inner wall of the annular mounting portion 11, there is a part of the annular mounting portion 11 on both sides of the first radial extension portion 13. With this structure, after the first radial extension portion 13 is subjected to force, the first radial extension portion 13 transmits the force to the annular mounting portion 11 in a dispersed manner, thereby avoiding the force being concentrated on a certain part of the annular mounting portion 11.

[0037] like Figures 1 to 6 As shown, a through hole is provided in the middle of the first radial extension portion 13, so that the first radial extension portion 13 is annular, and the first radial extension portion 13 is integrally formed with the annular mounting portion 11. At least a portion of the first radial extension portion 13 corresponds to the annular groove on the outer peripheral surface of the annular mounting portion 11, and the strength of the portion where the annular groove is provided on the annular mounting portion 11 is compensated by the first radial extension portion 13.

[0038] like Figures 1 to 6As shown, the first radial extension 13 is composed of an extension body 13a and a raised portion 13b. The raised portion 13b is provided on the axial end of the extension body 13a. The outer diameter of the raised portion 13b is smaller than the outer diameter of the extension body 13a. The extension body 13a is used to connect and support the vaned diffuser 5, and the raised portion 13b is used to connect and support the air inlet duct 3. The combination of the raised portion 13b and the extension body 13a can increase the strength of the first radial extension 13.

[0039] like Figures 1 to 6 As shown, a high-speed electric motor 2 is disposed within the casing 1. The speed of the high-speed electric motor 2 is at least 10,000 revolutions per minute. In this embodiment, the speed of the high-speed electric motor 2 is 100,000 revolutions per minute. Due to the high speed of the high-speed electric motor 2 during operation, the high-speed electric motor 2 generates a lot of heat. In this embodiment, the high-speed electric motor 2 is composed of a stator assembly and a rotor assembly.

[0040] like Figures 1 to 6 As shown, in this embodiment, a first channel 1a is formed between the high-speed electric motor 2 and the casing 1. Since the gas compressed by the compressor impeller 4 will enter the first channel 1a, the airflow will take away the heat generated by the high-speed electric motor 2 when flowing along the first channel 1a, thereby dissipating the heat of the high-speed electric motor 2. Therefore, the structure of this embodiment does not need to provide a water cooling structure, which simplifies the structure of the electronic centrifugal compressor.

[0041] like Figures 1 to 6 As shown, the air inlet 3 is arranged at one end of the casing 1, and the air inlet 3 includes a guide cylinder 30, a second radial extension portion 31, and an annular boss 32. The second radial extension portion 31 is arranged at the end of the guide cylinder 30; the annular boss 32 is arranged on the axial end face of the second radial extension portion 31, and the outer diameter of the annular boss 32 is smaller than the outer diameter of the second radial extension portion 31. An accommodating portion 33 is formed between the annular boss 32 and the second radial extension portion 31. A portion of the first radial extension portion 13 extends into the accommodating portion 33 and abuts against the circumferential surface of the annular boss 32. Then, the second radial extension portion 31 is fixed to the first radial extension portion 13.

[0042] like Figures 1 to 6 As shown, in this embodiment, the extension body 13a extends into the accommodating portion 33, the inner circumferential surface of the extension body 13a and the outer circumferential surface of the annular boss 32, and the axial end surface of the protrusion 13b and the axial end surface of the second radial extension 31 form a match, and threaded holes are provided on the first radial extension portion 13 and the second radial extension portion 31. Screws are threadedly connected to the threaded holes on the first radial extension portion 13 and the second radial extension portion 31, so that the first radial extension portion 13 and the second radial extension portion 31 are fastened into one, and then the air inlet 3 and the casing 1 are fastened into one.

[0043] like Figures 1 to 6 As shown, this embodiment also includes a second guide assembly, which includes a plurality of second guide vanes 6 spaced apart on the inner wall of the air inlet duct 3. The inlet of the guide cylinder 30 is trumpet-shaped, and the end surface of the second guide vane 6 facing the guide cylinder 30 is an arcuate surface. A portion of the second guide vane 6 is bonded to the inner wall of the inlet of the guide cylinder 30, and another portion of the second guide vane 6 is bonded to the inner wall of the middle portion of the guide cylinder 30.

[0044] like Figures 1 to 6 As shown, at least a portion of the compressor impeller 4 is located in the air inlet duct 3, and the compressor impeller 4 is fixed to the rotor shaft of the high-speed electric motor 2. In this embodiment, a portion of the compressor impeller 4 is located in the air inlet duct 3, and another portion of the compressor impeller 4 is located in the casing 1. When the compressor impeller 4 is working, the compressed gas generated is directly transported to the interior of the casing 1.

[0045] like Figures 1 to 6 As shown, the vaned diffuser 5 is fixed to the casing 1, that is, the vaned diffuser 5 is fixed to the first radial extension 13 of the casing 1, and the high-speed electric motor 2 is fixed to the vaned diffuser 5, so that one end of the high-speed electric motor 2 is supported by the vaned diffuser 5, and the vaned diffuser 5 cooperates with the compressor impeller 4. The vaned diffuser 5 is provided with a guide groove 5a for guiding the compressed gas into the first channel 1a.

[0046] like Figures 1 to 6 As shown, the vaned diffuser 5 includes a disk 50 and several conical diffuser components 51. The disk 50 is provided with a recessed portion 50a, which engages with the compressor impeller 4. The diffuser components 51 are positioned around the recessed portion 50a. The vaned diffuser 5 is positioned within the casing 1. Therefore, when the compressor impeller 4 engages with the recessed portion 50a, the remaining portion of the compressor impeller 4 is positioned within the casing 1.

[0047] like Figures 1 to 6 As shown, the cross-sectional area of the diffuser component 51 gradually increases from one end facing the compressor impeller 4 to the other end of the diffuser component 51. The diffuser components 51 are arranged along the circumference of the disk body 50, and a diffuser channel 52 is formed between every two adjacent diffuser components 51 and the disk body 50. When the compressor impeller 4 is operating, the compressed gas generated by the compressor impeller 4 enters the interior of the casing 1 through the diffuser channel 52.

[0048] like Figures 1 to 6As shown, in this embodiment, the diffuser component 51 is composed of an axial protrusion 51a and a radial protrusion 51b. The axial protrusion 51a protrudes beyond the axial end surface of the disk body 50, and the radial protrusion 51b protrudes beyond the circumferential surface of the disk body 50. Since the diffuser component 51 protrudes toward the disk body 50, after combining this structure with the disk body 50, a diffuser channel 52 is formed between every two adjacent diffuser components 51 and the disk body 50.

[0049] like Figures 1 to 6 As shown, the disk body 50 is provided with a first mounting hole 53 for mounting the high-speed electric motor 2. In this embodiment, the first mounting hole 53 is located in the area where the recessed portion 50a is located. The first mounting hole 53 is preferably a countersunk hole. After a screw is passed through the first mounting hole 53 to connect with the high-speed electric motor 2, the head of the screw sinks into the countersunk hole, thereby avoiding interference with the high-speed rotating compressor impeller 4.

[0050] like Figures 1 to 6 As shown, the diffuser component 51 is provided with a second mounting hole 54 for mounting the casing 1. The second mounting hole 54 is provided on an axial protrusion 51a. After the axial protrusion 51a engages with the first radial extension 13 of the casing 1, the axial protrusion 51a and the first radial extension 13 are fastened together using screws. The second mounting hole 54 extends axially along the diffuser component 51 and can extend to the other axial end surface of the vaned diffuser 5.

[0051] like Figures 1 to 6 As shown, the first air guide assembly is located within the casing 1 and directs airflow along the axial direction of the casing 1. The first air guide assembly cooperates with the casing 1 and / or the high-speed electric motor 2. The first air guide assembly includes a plurality of air guide fins 70 for guiding airflow and dissipating heat from the high-speed electric motor 2. These air guide fins 70 are spaced apart along the circumference of the casing 1. One end of the air guide fin 70 is fixed to the inner wall surface of the casing 1, and the other end of the air guide fin 70 cooperates with the high-speed electric motor 2. A guide channel 71 for airflow is formed between two adjacent air guide fins 70 and the casing 1 and the high-speed electric motor 2. The other end of the air guide fin 70 abuts against the high-speed electric motor 2 to provide support for the high-speed electric motor 2.

[0052] like Figures 1 to 6 As shown, the guide fins 70 are arranged along the axial direction of the casing 1. Therefore, the guide channel 71 is parallel to the axial direction of the casing 1. When the compressed gas entering the first channel 1a flows along the guide channel 71, it is forcibly rectified by the guide channel 71, so that the output airflow is axial flow.

[0053] like Figures 1 to 7As shown, one of the functions of the guide heat sink 70 and the guide channel 71 is to guide the airflow entering the casing 1 so that the airflow flows in the axial direction, avoids airflow turbulence and reduces losses. The second function of the guide heat sink 70 is to transfer the heat generated by the high-speed electric motor 2. On the one hand, as the airflow flows through the guide channel 71, it will exchange heat with the guide heat sink 70 to accelerate the heat dissipation on the guide heat sink 70, thereby indirectly dissipating the heat for the high-speed electric motor 2. On the other hand, since the guide heat sink 70 transfers heat to the casing 1, the heat is diffused on the casing 1. Similarly, due to the rapid flow of the airflow, the airflow exchanges heat with the casing 1. Thus, the heat dissipation area is increased through the transfer effect of the guide heat sink 70. The heat exchange effect with the fast-flowing airflow enables the high-speed electric motor 2 in the present invention to be quickly cooled, so there is no need to cool the high-speed electric motor 2 through a water cooling structure.

[0054] The present invention is not limited to the above embodiments, for example:

[0055] (a), such as Figure 8 As shown, the first air guide assembly further includes a heat-conducting support component 72, one end of which is fixed to the other end of the air-conducting heat sink 70, and the other end of the heat-conducting support component 72 abuts the high-speed electric motor 2. The heat-conducting support component 72 can be an annular component or an arc-shaped component. If the heat-conducting support component 72 is an annular component, only one heat-conducting support component 72 is required. The heat-conducting support component 72 can be placed on the high-speed electric motor 2, and the other end of each air-conducting heat sink 70 is fixed to the heat-conducting support component 72. If the heat-conducting support component 72 is an arc-shaped component, a heat-conducting support component 72 needs to be fixed to the end of each air-conducting heat sink 70.

[0056] (b) If Figure 9 As shown, the first flow guide assembly further includes a heat-conducting strip 73. A groove is provided on the circumference of the high-speed electric motor 2, extending along the axial direction of the high-speed electric motor 2. The heat-conducting strip 73 is fixed to the heat-conducting support component 72 and embedded in and engaged with the groove on the circumference of the high-speed electric motor 2. This structure further increases the heat dissipation area of the high-speed electric motor 2 and further optimizes the heat dissipation of the high-speed electric motor 2.

Claims

1. An axial-flow electronic centrifugal compressor, comprising a casing (1), a high-speed electric motor (2), an air inlet duct (3), and a compressor impeller (4), wherein the high-speed electric motor (2) is disposed in the casing (1), the air inlet duct (3) is disposed at one end of the casing (1), at least a portion of the compressor impeller (4) is located in the air inlet duct (3), and the compressor impeller (4) is fixed to the rotor shaft of the high-speed electric motor (2), characterized in that: A first channel (1a) is formed between the high-speed electric motor (2) and the casing (1); The invention also includes a vane diffuser (5), the vane diffuser (5) is fixed to the casing (1), the high-speed electric motor (2) is fixed to the vane diffuser (5), the vane diffuser (5) cooperates with the compressor impeller (4), and the vane diffuser (5) is provided with a guide groove (5a) for guiding the compressed gas into the first channel (1a); A first flow guide component located in the casing (1) and causing the airflow to flow axially along the casing (1), the first flow guide component cooperating with the casing (1) and / or the high-speed electric motor (2); The receiver (1) comprises: A hollow shell (10) with openings at both ends; An intermediate connecting assembly, the intermediate connecting assembly comprising an annular mounting portion (11), a sealing component (12), and a first radial extension portion (13); an annular groove is provided on the outer peripheral surface of the annular mounting portion (11); the sealing component (12) cooperates with the annular groove; after at least a portion of the annular mounting portion (11) is located in the housing (10) and fixed to the housing (10), the sealing component (12) forms a seal between the housing (10) and the annular mounting portion (11); the first radial extension portion (13) is located in the annular mounting portion (11) and fixed to the annular mounting portion (11); and the first radial extension portion (13) is fixed to the air inlet (3) and the vaned diffuser (5); The air intake duct (3) includes: a flow guide cylinder (30); a second radial extension portion (31), the second radial extension portion (31) being arranged at an end portion of the flow guide cylinder (30); An annular boss (32) is provided on the axial end face of the second radial extension portion (31), the outer diameter of the annular boss (32) is smaller than the outer diameter of the second radial extension portion (31), and an accommodating portion (33) is formed between the annular boss (32) and the second radial extension portion (31), and a portion of the first radial extension portion (13) extends into the accommodating portion (33) and abuts against the circumferential surface of the annular boss (32), and then the second radial extension portion (31) is fixed to the first radial extension portion (13).

2. The axial-flow electronic centrifugal compressor according to claim 1, characterized in that: It also includes a second flow guide component, which includes a plurality of second flow guide plates (6) arranged at intervals on the inner wall surface of the air inlet duct (3).

3. The axial-flow electronic centrifugal compressor according to claim 1, characterized in that: The vaned diffuser (5) comprises: A disc body (50), wherein a recessed portion (50a) is provided on the disc body (50), and the compressor impeller (4) cooperates with the recessed portion (50a); A plurality of conical diffuser components (51) are provided, wherein the cross-sectional area of the diffuser component (51) gradually increases from one end facing the compressor impeller (4) to the other end of the diffuser component (51). The diffuser components (51) are arranged along the circumference of the disk body (50), and a diffuser channel (52) is formed between every two adjacent diffuser components (51) and the disk body (50).

4. The axial-flow electronic centrifugal compressor according to claim 3, characterized in that: The disc body (50) is provided with a first mounting hole (53) for mounting the high-speed electric motor (2), and the pressure diffuser component (51) is provided with a second mounting hole (54) for mounting the casing (1).

5. The axial-flow electronic centrifugal compressor according to claim 1, characterized in that: The first air guide assembly includes a plurality of air guide fins (70) for guiding air flow and dissipating heat from the high-speed electric motor (2). The air guide fins (70) are arranged at intervals along the circumference of the casing (1). One end of the air guide fin (70) is fixed to the inner wall surface of the casing (1), and the other end of the air guide fin (70) cooperates with the high-speed electric motor (2). A air guide channel (71) is formed between two adjacent air guide fins (70) and the casing (1) and the high-speed electric motor (2).

6. The axial-flow electronic centrifugal compressor according to claim 5, characterized in that: The other end of the guide heat sink (70) abuts against the high-speed electric motor (2) to form support for the high-speed electric motor (2).

7. The axial-flow electronic centrifugal compressor according to claim 5, characterized in that: The first flow guide assembly further includes a heat-conducting support component (72), one end of the heat-conducting support component (72) is fixed to the other end of the flow-conducting heat sink (70), and the other end of the heat-conducting support component (72) abuts against the high-speed electric motor (2).

8. The axial-flow electronic centrifugal compressor according to claim 7, characterized in that: The first flow guide assembly further includes a heat conducting strip (73), a groove is provided on the circumferential surface of the high-speed electric motor (2), the groove extends along the axial direction of the high-speed electric motor (2), the heat conducting strip (73) is fixed to the heat conducting support component (72), and the heat conducting strip (73) is embedded in the groove on the circumferential surface of the high-speed electric motor (2) and cooperates with the groove.

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