Streamline tunnel wheel electric compressor

Abstract

The utility model discloses a streamline tunnel wheel electric gas compressor which comprises a motor, a compressor, a compressor and a compressor body. One end of the streamline tunnel type compressor wheel is fixedly arranged on an output shaft of the motor and can rotate along with the output shaft of the motor, a medium inlet is formed in the other end of the streamline tunnel type compressor wheel, and the streamline tunnel type compressor wheel is provided with a plurality of streamline tunnels; the volute is arranged on the outer side of the streamline tunnel type gas compressor wheel in a sleeving mode and fixedly connected to the motor, the streamline tunnel wheel electric gas compressor adopts the integral streamline tunnel type gas compressor wheel, the structural strength is high, and therefore the selection range of materials is wider; materials which are lower in cost and lighter in weight can be screened, so that the cost and the weight of the streamline tunnel type gas compressor wheel are reduced, in addition, ceramic materials which are larger in brittleness are possibly selected, and compression of high-temperature corrosive gas is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric compressors, and in particular relates to a streamline tunnel wheel electric compressor. Background Art

[0002] A turbocharger is a device commonly used in engines to increase intake density and improve power output. However, a turbocharger has two core components: a turbine and a compressor. Not only does it make the structure relatively complex, but the turbine end is also continuously flushed by high-temperature exhaust gas, which places high demands on material performance. Commonly used high-temperature alloys have high density, which increases the weight of the turbocharger. The increase in rotor weight will lead to a slow response to sudden throttle changes and delayed power output due to rotor inertia. Although mechanical supercharging has good response, it requires sacrificing economy. Electric compressors not only do not require heavier turbine components, but also have a fast response. With the upgrade of emission standards and the rapid development of new energy vehicles, the demand for electric compressors has increased significantly.

[0003] On the other hand, the current mainstream compressor wheel structure is a semi-open centrifugal impeller, which has shortcomings such as large tip clearance leakage loss and low compressor efficiency; the traditional closed impeller has thin blades and is difficult to support the centrifugal stress generated by the wheel cover at high speed.

[0004] For example, the patent application document with Chinese invention patent application number CN202310334422.1 discloses the structure of a centrifugal compressor impeller of an aviation turbojet engine, including: an impeller base, a central opening of the impeller base and a shaft sleeve, the inner wall of the shaft sleeve is a polygonal structure, and blades are evenly distributed on the impeller base, the blades include large blades and small blades, and the large and small blades are distributed alternately.

[0005] The compressor of the prior art adopts a semi-open centrifugal impeller, which has the problem of low compressor efficiency due to tip clearance leakage.

[0006] For another example, the patent application document with Chinese invention patent application number CN202011288827.9 discloses a closed impeller and compressor, including a rear cover, blades, a sleeve and a front cover, wherein the rear cover is arranged at the rear end of the sleeve, and the rear cover and the sleeve center are provided with an integrated through hole for sleeve-mounting and fixing on the rotating shaft; the blades are arranged around the sleeve and rotate in the same direction, one end of the blades is connected to the outer wall of the sleeve, and the other end is connected to the end face of the rear cover; the front cover is arranged on the blades, and the front cover is in the shape of a truncated cone; the air inlet surface of the front cover is a curved surface with a smooth transition along the ridge contour of the blade, and the back-air surface is provided with grooves that match the ends of the blades, and the ends of the blades corresponding to each groove are embedded in the grooves for tight fitting connection; a flow channel is formed between the blades, the rear cover and the front cover; the tail of the front cover and the rear cover are separated into air outlets by blades, and the gas flows out of the air outlet from the front of the blade through the flow channel.

[0007] The compressor of the prior art adopts a closed impeller, but the structure used to separate the flow passage is still a thin blade, which is difficult to support the centrifugal stress generated by the wheel cover at high speed.

[0008] Based on the above technical problems existing in the prior art, the present application proposes a streamlined tunnel wheel electric compressor. Utility Model Content

[0009] The utility model aims to provide a streamline tunnel wheel electric compressor in view of the deficiencies in the prior art.

[0010] The streamline tunnel wheel electric compressor comprises:

[0011] Electric motors, which convert electrical energy into rotational mechanical energy;

[0012] A streamlined tunnel type compressor wheel, one end of which is fixedly arranged on the output shaft of the motor and can rotate together with the output shaft of the motor, the other end of which is provided with a medium inlet, and the streamlined tunnel type compressor wheel is provided with a plurality of streamline tunnels;

[0013] The volute is sleeved on the outer side of the streamline tunnel type compressor wheel and is fixedly connected to the electric motor.

[0014] Furthermore, the volute is an integral volute.

[0015] Furthermore, a first bearing and a second bearing are respectively disposed at both ends of the output shaft, and the first bearing and the second bearing are both fixedly disposed on the housing of the motor.

[0016] Furthermore, a plurality of the streamline tunnels are centrally symmetrically distributed around the axis of the streamline tunnel type compressor wheel.

[0017] Furthermore, the center line of the streamline tunnel is a continuous and differentiable smooth three-dimensional curve.

[0018] Furthermore, the normal cross-sections at various locations of the streamline tunnel are circular or elliptical, and the normal cross-sectional area in the streamline tunnel changes uniformly along the center line of the flow channel.

[0019] Furthermore, a sealing structure is provided between the streamlined tunnel type compressor wheel and the volute, and the sealing structure includes sealing comb teeth provided on the outer surface of the streamlined tunnel type compressor wheel and a sealing step provided on the inner surface of the volute, and the sealing comb teeth are matched with the sealing step.

[0020] Furthermore, two streamlined tunnel type compressor wheels are arranged in series on one side of the output shaft of the electric motor.

[0021] Furthermore, a streamlined tunnel type compressor wheel is respectively arranged at both ends of the output shaft.

[0022] Furthermore, the volute is a split volute, which includes an inlet circular pipe and an outlet volute flow channel, the inlet circular pipe is socketed with the inlet end of the streamline tunnel type compressor wheel, and an inlet labyrinth sealing structure is arranged at the overlapping portion of the socketing; the outlet volute flow channel is connected to the outlet end of the streamline tunnel type compressor wheel, the connection part overlaps and an outlet labyrinth sealing structure is arranged.

[0023] Furthermore, the medium inlet of the streamline tunnel is provided with a first chamfer.

[0024] Furthermore, the medium outlet of the streamline tunnel is provided with a second chamfer.

[0025] Furthermore, the first chamfer and the second chamfer are both arc-shaped chamfers.

[0026] Furthermore, the first chamfer is arranged between the medium inlet surface of the streamline tunnel type compressor wheel and the inner wall of the streamline tunnel.

[0027] Furthermore, the second chamfer is arranged between the medium outlet surface of the streamline tunnel type compressor wheel and the inner wall of the streamline tunnel.

[0028] The beneficial effects of the utility model are:

[0029] The streamlined tunnel wheel electric compressor of the utility model no longer has thin blades between the flow channels of the streamlined tunnel type compressor wheel, and has a greater structural strength, and is not easily damaged when encountering abrasive particles, welding particles, gravel, etc.

[0030] The utility model adopts an integral streamlined tunnel compressor wheel, which has a high structural strength, so the range of materials to be selected is wider, which is conducive to screening materials with lower cost and lighter weight, thereby reducing the cost and weight of the streamlined tunnel compressor wheel. In addition, it is also possible to select ceramic materials with greater brittleness to achieve compression of high-temperature and corrosive gases;

[0031] The step seal structure and labyrinth seal structure of the utility model fully utilize the outer side surface of the streamline tunnel type compressor wheel, so that the streamline tunnel wheel electric compressor has a better sealing effect and reduces the gap leakage loss;

[0032] When the utility model adopts the split volute, the manufacturing process of the volute is simplified, the manufacturing cost of the volute is reduced, and the weight of the whole machine is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a single-stage streamline tunnel wheel electric compressor in an embodiment of the present application;

[0034] Figure 2 This is a schematic diagram of the streamlined tunnel compressor wheel structure in an embodiment of the present application;

[0035] Figure 3 This is a schematic diagram of the structure of a two-stage streamline tunnel wheel electric compressor in series in an embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of a parallel two-stage streamline tunnel wheel electric compressor in an embodiment of the present application;

[0037] Figure 5 This is a schematic diagram of the structure of a streamlined tunnel wheel electric compressor with a split volute in an embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the structure of the streamline tunnel in the embodiment of the present application;

[0039] In the figure, 1-streamline tunnel type compressor wheel; 2-electric motor; 3-integral volute; 4-shaft; 51-first bearing; 52-second bearing; 6-inlet; 7-streamline tunnel; 71-first chamfer; 72-second chamfer; 8-step sealing structure; 81-sealing comb teeth; 82-sealing step; 9-inlet circular pipe; 10-outlet volute flow channel; 11-inlet labyrinth sealing structure; 12-outlet labyrinth sealing structure. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0041] Example

[0042] like Figure 1 As shown, the streamline tunnel wheel electric compressor comprises:

[0043] Motor 2, converts electrical energy into rotational mechanical energy;

[0044] A streamlined tunnel type compressor wheel 1, one end of which is fixedly arranged on the output shaft 4 of the motor 2 and can rotate together with the output shaft 4 of the motor 2, the other end of which is provided with a medium inlet, the streamlined tunnel type compressor wheel 1 is provided with a plurality of streamline tunnels 7, and the medium is discharged from the outer radial outlet after being pressurized by the streamlined tunnel type compressor wheel 1;

[0045] The volute 3 is sleeved on the outer side of the streamline tunnel type compressor wheel 1 and fixedly connected to the motor 2 .

[0046] In the above embodiment, the volute 3 is an integral volute, which has good air tightness, few parts and high assembly accuracy;

[0047] The streamlined tunnel type compressor wheel 1 is made of ceramic material;

[0048] The motor 2 adopts a light diesel electric compressor, and the specific electrical specifications are: voltage-48V, steady-state current-105A, dynamic maximum current (<1s)-150A, continuous electric power-5kW, maximum allowable electric power-7.2kW;

[0049] The main material of the streamlined tunnel type compressor wheel 1 is aluminum alloy, which mainly utilizes the characteristics of low density and high strength of aluminum alloy. For the streamlined tunnel type compressor wheel 1 with a complex structure, an additive manufacturing method is used in this embodiment;

[0050] In the actual manufacturing process, the SLM selective laser melting process of AlSi10Mg material is relatively mature and low-cost, and the strength and hardness of the parts meet the requirements, while also having good dynamic characteristics;

[0051] The material of the volute 3 is also aluminum alloy, that is, the same material as the streamlined tunnel compressor wheel 1;

[0052] The two ends of the output shaft 4 are respectively provided with a first bearing 51 and a second bearing 52, and the first bearing 51 and the second bearing 52 are both fixedly arranged on the housing of the motor 2;

[0053] In the above embodiment, in actual operation, the first bearing 51 and / or the second bearing 52 bear both radial load and axial load, and deep groove ball bearings are selected because the operating conditions of the electric compressor are usually complicated.

[0054] As an improved solution, the first bearing 51 and / or the second bearing 52 may also be angular contact ball bearings;

[0055] As an improved solution, the first bearing 51 and / or the second bearing 52 may also be tapered roller bearings.

[0056] like Figure 2 As shown, the plurality of streamline tunnels 7 are centrally symmetrically distributed around the axis of the streamline tunnel type compressor wheel 1;

[0057] The center line of the streamline tunnel 7 is a continuous and derivable smooth three-dimensional curve;

[0058] The normal cross-section of each part of the streamline tunnel 7 is a circle or an ellipse, and the normal cross-sectional area in the streamline tunnel 7 changes uniformly along the center line of the flow channel;

[0059] like Figure 6 The medium inlet of the streamline tunnel 7 is provided with a first chamfer 71;

[0060] The medium outlet of the streamline tunnel 7 is provided with a second chamfer 72;

[0061] The first chamfer 71 and the second chamfer 72 are both arc chamfers;

[0062] Arc-shaped chamfers are used to make the medium flow smoother;

[0063] Specifically, the first chamfer 71 is arranged between the medium inlet surface of the streamline tunnel type compressor wheel 1 and the inner wall of the streamline tunnel 7, and the second chamfer 72 is arranged between the medium outlet surface of the streamline tunnel type compressor wheel 1 and the inner wall of the streamline tunnel 7.

[0064] Furthermore, a sealing structure 8 is provided between the streamlined tunnel type compressor wheel 1 and the volute 3, and the sealing structure 8 comprises a sealing grate 81 provided on the outer surface of the streamlined tunnel type compressor wheel 1 and a sealing step 82 provided on the inner surface of the volute 3, and the sealing grate 81 is matched with the sealing step 82;

[0065] In the above embodiment, the sealing comb teeth 81 and the sealing steps 82 cooperate with each other to form the stepped sealing structure 8;

[0066] The sealing grate teeth 81 are made of aluminum alloy, and the sealing grate teeth 81 and the streamlined tunnel compressor wheel 1 are formed in an integrated manner;

[0067] The material of the sealing step 82 is also aluminum alloy, and the sealing step 82 and the volute 3 are formed in an integral manner;

[0068] The sealing comb teeth 81 cooperate with the sealing step 82 to form a sealing structure, forming a step tooth seal with good sealing performance, which can greatly reduce the gap leakage flow and improve the compressor efficiency. Compared with the traditional semi-open impeller, the leakage flow is reduced by more than 90%.

[0069] like Figure 3 As shown, two streamline tunnel compressor wheels 1 are arranged in series on one side of the output shaft 4 of the electric motor 2 to form a two-stage supercharging, which is convenient for the arrangement of the gas path and can further increase the compression ratio.

[0070] like Figure 4As shown, a streamlined tunnel compressor wheel 1 is respectively arranged at both ends of the output shaft 4 to form a parallel structure, which can further increase the medium flow rate.

[0071] like Figure 5 The volute 3 is a split volute, and the split volute includes an inlet circular pipe 9 and an outlet volute flow channel 10. The inlet circular pipe 9 is sleeved with the inlet end of the streamline tunnel type compressor wheel 1, and an inlet labyrinth sealing structure 11 is arranged at the sleeved overlapping part; the outlet volute flow channel 10 is connected to the outlet end of the streamline tunnel type compressor wheel 1, and the connection part overlaps and an outlet labyrinth sealing structure 12 is arranged;

[0072] In the above embodiment, the inlet labyrinth seal structure 11 is composed of an inlet rotor seal tooth and an inlet stator seal tooth, and the inlet rotor seal tooth and the inlet stator seal tooth are both made of aluminum alloy and are integrally manufactured with the streamlined tunnel compressor wheel 1 and the inlet round tube 9 respectively;

[0073] The outlet labyrinth seal structure 12 is composed of outlet rotor seal teeth and outlet stator seal teeth, both of which are made of aluminum alloy. The outlet rotor seal teeth and the outlet stator seal teeth are respectively manufactured integrally with the streamlined tunnel compressor wheel 1 and the outlet volute flow channel 10.

[0074] The present application is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, which are within the scope of the present application to be protected. The scope of protection claimed by the present application is defined by the attached claims.

Claims

1. A streamlined tunnel wheel electric compressor, characterized in that: include: An electric motor converts electrical energy into rotational mechanical energy, wherein the electric motor is a light diesel electric compressor; A streamlined tunnel type compressor wheel, one end of which is fixedly arranged on the output shaft of the motor and can rotate with the output shaft of the motor, the other end of which is provided with a medium inlet, and the streamlined tunnel type compressor wheel is provided with a plurality of streamline tunnels, wherein the streamlined tunnel type compressor wheel is made of ceramic material; A volute is sleeved on the outer side of the streamlined tunnel compressor wheel and fixedly connected to the motor, wherein the volute is made of aluminum alloy; Wherein, a plurality of the streamline tunnels are centrally symmetrically distributed around the axis of the streamline tunnel type compressor wheel; The center line of the streamline tunnel is a continuous and derivable smooth three-dimensional curve; The normal cross-section at each location of the streamline tunnel is a circle or an ellipse, and the normal cross-sectional area in the streamline tunnel changes uniformly along the center line of the flow channel; The medium inlet of the streamline tunnel is provided with a first chamfer, and the medium outlet of the streamline tunnel is provided with a second chamfer, and both the first chamfer and the second chamfer are arc-shaped chamfers; The volute is a split volute, comprising an inlet circular tube and an outlet volute flow channel, wherein the inlet circular tube is sleeved with the inlet end of the streamline tunnel type compressor wheel, and an inlet labyrinth seal structure is arranged at the sleeved overlapped portion; the outlet volute flow channel is connected to the outlet end of the streamline tunnel type compressor wheel, and the connection part is partially overlapped and an outlet labyrinth seal structure is arranged; The inlet labyrinth seal structure is composed of an inlet rotor seal tooth and an inlet stator seal tooth, and the inlet rotor seal tooth and the inlet stator seal tooth are respectively manufactured integrally with the streamline tunnel type compressor wheel and the inlet round tube; The outlet labyrinth seal structure is composed of an outlet rotor seal tooth and an outlet stator seal tooth, and the outlet rotor seal tooth and the outlet stator seal tooth are respectively manufactured integrally with the streamline tunnel compressor wheel and the outlet volute flow passage; The output shaft is provided with a first bearing and a second bearing at both ends, respectively. The first bearing and the second bearing are both fixedly arranged on the housing of the motor. The first bearing and the second bearing are both deep groove ball bearings, angular contact ball bearings or tapered roller bearings.

2. The streamlined tunnel wheel electric compressor according to claim 1, characterized in that: The volute is an integral volute.

3. The streamlined tunnel wheel electric compressor according to claim 1, characterized in that: A sealing structure is provided between the streamlined tunnel type compressor wheel and the volute, and the sealing structure comprises sealing grate teeth provided on the outer surface of the streamlined tunnel type compressor wheel and a sealing step provided on the inner surface of the volute, and the sealing grate teeth are matched with the sealing step.

4. The streamlined tunnel wheel electric compressor according to claim 1, characterized in that: Two streamline tunnel type compressor wheels are arranged in series on one side of the output shaft of the electric motor.

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