Multi-stage impeller structure for motor

Abstract

The utility model provides a multi-stage impeller structure for a motor, and belongs to the technical field of impellers. The multi-stage impeller structure for the motor comprises an impeller disc, and a plurality of first-stage guide vanes, second-stage splitter vanes and third-stage branched vanes which are arranged on the impeller disc, the first-stage guide vane and the second-stage splitter vane are arranged on the impeller disc in the circumferential direction at equal intervals, a guide plate is formed at the top of the front end of the first-stage guide vane, and the second-stage splitter vane is lower than the first-stage guide vane; third-stage branched blades are formed on the impeller disc at the blade tail ends of the first-stage flow guide blades and the second-stage flow distribution blades, the third-stage branched blades are bent and deviated in the direction opposite to the bending direction of the flow guide plate, and branched spaces for restraining backflow are formed between the third-stage branched blades and the blade tail ends. The impeller has the advantages of reducing airflow energy loss, enhancing pressurization, restraining backflow and improving the circulation efficiency of the impeller.

Description

Technical Field

[0001] The utility model belongs to the technical field of impellers, and particularly relates to a multi-stage impeller structure for an electric motor. Background Art

[0002] The impeller of an electric motor is an important component of the electric motor. Its main function is to generate thrust and enable the electric motor to operate, and it is one of the main output parts of the electric motor. Due to the radial distribution of the impeller blades, the gas flow channel space between the impeller blades shows an obvious shape feature of being narrow at the air inlet end and wide at the air outlet end. Therefore, the flow velocity of the gas in the flow channel space will decrease, resulting in a gradually worse wall attachment of the gas on the impeller, and an obvious gas backflow phenomenon will form near the end of the blade at the air outlet end, affecting the flow-through efficiency of the impeller.

[0003] The patent with the application number CN202020813188.2 provides an energy-saving centrifugal impeller, which includes a wheel disc body, a first guide vane and a second guide vane. The front section of the first vane guides the air flow into the impeller to reduce the air flow impact loss. The second vane is added at the middle section to play a role in contracting the flow channel, enhancing the pressurization effect, and reducing the air inlet resistance. This patent improves the flow-through efficiency of the impeller to a certain extent, but still cannot suppress the generated gas backflow phenomenon. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-stage impeller structure for an electric motor aiming at the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A multi-stage impeller structure for an electric motor includes an impeller disc and a number of first-stage guide vanes, second-stage shunt vanes and third-stage forked vanes arranged thereon. The impeller disc forms an impeller shaft head at the top, and a motor shaft hole is opened in the center of the impeller shaft head and penetrates downward through the impeller disc. The motor shaft passes through the motor shaft hole to drive the impeller disc to rotate and operate;

[0006] The first-stage guide vanes are arranged on the impeller disc at equal circumferential distances around the impeller shaft head. The bottom of the first-stage guide vanes starts from the impeller shaft head and is arranged in a radial pattern fitting on the impeller disc. The top of the first-stage guide vanes bends upward and extends at the front top near the impeller shaft head to form a guide plate, and the height of the guide plate is lower than the height of the impeller shaft head;

[0007] The second-stage shunt vanes are arranged at the equal division points between adjacent first-stage guide vanes and are also arranged on the impeller disc at equal circumferential distances. The bottom of the second-stage shunt vanes starts from a position lower than the impeller shaft head and is arranged in a radial pattern fitting on the impeller disc. An air flow channel space is formed between the first-stage guide vanes and the second-stage shunt vanes;

[0008] At the blade ends of the first-stage guide vanes and the second-stage splitter vanes, three-stage bifurcated vanes are formed on the impeller disc. The three-stage bifurcated vanes are bent and offset in the reverse direction of the bending direction of the guide plate, forming a bifurcated space for suppressing backflow between the three-stage bifurcated vanes and the blade ends.

[0009] In the above-mentioned multi-stage impeller structure for an electric motor, the height of the second-stage splitter vanes is between 1 / 2 and 2 / 3 of the height of the first-stage guide vanes.

[0010] In the above-mentioned multi-stage impeller structure for an electric motor, the angle θ by which the three-stage bifurcated vanes deviate from the blade ends ranges from 0° to 60°.

[0011] Compared with the prior art, the multi-stage impeller structure for an electric motor provided by the present utility model has the following advantages: The first-stage guide vanes introduce air flow into the impeller by arranging a guide plate, reducing the energy loss caused by air flow impact; the second-stage splitter vanes play a role in contracting the flow channel, increasing the gas flow velocity, and enhancing the pressure boost; the arrangement of the three-stage bifurcated vanes can relieve the expansion trend of the flow channel space, and at the same time fit the offset direction of the air flow under the action of centrifugal force, suppressing the gas backflow phenomenon at the blade ends and improving the flow-through efficiency of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the multi-stage impeller structure for this electric motor;

[0013] Figure 2 is a side view of the structure of the multi-stage impeller structure for this electric motor;

[0014] Figure 3 is a top view of the structure of the multi-stage impeller structure for this electric motor;

[0015] In the above figures, 100, impeller disc; 110, first-stage guide vanes; 111, guide plate; 120, second-stage splitter vanes; 130, three-stage bifurcated vanes; 131, blade ends; 132, bifurcated space; 140, flow channel space; 150, motor shaft hole; 151, impeller shaft head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following are specific embodiments of the present utility model in combination with the accompanying drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0017] As Figures 1 to 3As shown in the figure, the multi-stage impeller structure for this motor includes an impeller disk 100. The impeller disk 100 as a whole presents an inverted horn-shaped frustum. The impeller disk 100 forms an impeller shaft head 151 at the top. A motor shaft hole 150 is opened in the center of the impeller shaft head 151 and penetrates downward through the impeller disk 100. When the impeller is installed and operating, the working shaft of the motor passes through the motor shaft hole 150 and is fixedly connected to the impeller, thereby driving the impeller disk 100 to rotate and work.

[0018] A number of first-stage guiding vanes 110, second-stage dividing vanes 120, and third-stage bifurcating vanes 130 are integrally formed on the arc-shaped outer surface of the impeller disk 100. Among them, the first-stage guiding vanes 110 are circumferentially and equidistantly arranged on the impeller disk 100 around the impeller shaft head 151. The second-stage dividing vanes 120 are arranged at the equal division points between adjacent first-stage guiding vanes 110 and are also circumferentially and equidistantly arranged on the impeller disk 100. The first-stage guiding vanes 110 and the second-stage dividing vanes 120 are arranged at equal distances and intervals from each other, and a flow channel space 140 for air flow to pass through is formed between them.

[0019] As Figures 1 to 2 shown, the bottom of the first-stage guiding vane 110 starts from the impeller shaft head 151 and is radially distributed and arranged by fitting on the impeller disk 100. The top of the first-stage guiding vane 110 bends upward and extends at the front top near the impeller shaft head 151 to form a guiding plate 111. The height of the guiding plate 111 is lower than the height of the impeller shaft head 151. The inner side of the guiding plate 111 is the wind-receiving surface, and the outer side is the wind-leading surface. The guiding plate 111 of the front first-stage guiding vane 110 introduces the air flow to the wind-receiving surface of the guiding plate 111 of the rear first-stage guiding vane 110 through the wind-leading surface, thereby reducing the impact of the air flow on the first-stage guiding vane 110 and reducing the energy loss of the air flow.

[0020] The bottom of the second-stage dividing vane 120 starts from a position lower than the impeller shaft head 151 and is radially distributed and arranged by fitting on the impeller disk 100. The top of the second-stage dividing vane 120 is arc-shaped and is slightly bent and offset in the same direction as the bending direction of the guiding plate 111. The height of the second-stage dividing vane 120 is between 1 / 2 and 2 / 3 of the height of the first-stage guiding vane 110, which is convenient for the second-stage dividing vane 120 to divide the air flow into the flow channel space 140 at an angle that fits the air flow direction. It not only plays a role in contracting the flow channel, increasing the gas flow rate, and enhancing the pressure boost, but also can reduce the energy loss of the air flow when the air flow is divided.

[0021] The blade height gradually decreases at the blade ends 131 of the first-stage guiding vanes 110 and the second-stage dividing vanes 120. Their structures are basically the same. At the blade ends 131 of both, third-stage bifurcating vanes 130 are formed on the impeller disk 100. The third-stage bifurcating vanes 130 are bent and offset in the opposite direction to the bending direction of the guiding plate 111 to form a deflection angle θ. The angle range of θ is between 0° and 60°.

[0022] The setting of the triple-bifurcation blade 130 serves to contract the cavity at the outlet end of the flow channel space 140 and relieve the expansion trend of the flow channel space 140. Therefore, the setting of the deflection angle θ of the triple-bifurcation blade 130 should be adjusted according to the overall blade number distribution of the first-stage guide vane 110 and the second-stage split vane 120 on the impeller disk 100, and the degree of expansion at the outlet end of the formed flow channel space 140, so as to keep the air outlet at the outlet end of the flow channel space 140 as uniform as possible. On the other hand, due to the influence of the centrifugal force generated when the impeller rotates, the air flow will have a certain angular deviation when discharging air. Therefore, the setting of the triple-bifurcation blade 130 also conforms to the deviation direction of the air flow, improves the wall attachment of the air flow on the impeller disk 100, inhibits the gas backflow phenomenon at the blade tip 131, and improves the flow-through efficiency of the impeller.

[0023] Furthermore, a bifurcation space 132 is formed between the triple-bifurcation blade 130 and the blade tip 131, preventing the air flow from forming a backflow at the blade tip 131. The bifurcation space 132 has two setting forms. When the bifurcation space 132 is hollow, it can serve as a buffer and deformation space for the blade when receiving the impact of the air flow. When the bifurcation space 132 is solid, the blade tip 131, the bifurcation space 132 and the triple-bifurcation blade 130 together form a structural block, which plays a role in inhibiting the backflow and improving the structural strength of the blade tip 131.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0025] Although various terms are used more in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A multi - stage impeller structure for a motor, comprising an impeller disk (100) and a number of first - stage guide vanes (110), second - stage shunt vanes (120) and third - stage forked vanes (130) arranged thereon. The impeller disk (100) forms an impeller shaft head (151) at the top. A motor shaft hole (150) is opened at the center of the impeller shaft head (151) and penetrates downward through the impeller disk (100). The motor shaft passes through the motor shaft hole (150) to drive the impeller disk (100) to rotate. Characterized in that, The first - stage guide vanes (110) are circumferentially and equidistantly arranged on the impeller disk (100) around the impeller shaft head (151). The bottom of the first - stage guide vanes (110) starts from the impeller shaft head (151) and is arranged in a radial pattern on the impeller disk (100). At the top, a guide plate (111) is formed by bending upward at the front top near the impeller shaft head (151). The height of the guide plate (111) is lower than the height of the impeller shaft head (151). The second - stage shunt vanes (120) are arranged at the equal - division positions between adjacent first - stage guide vanes (110) and are also circumferentially and equidistantly arranged on the impeller disk (100). The bottom of the second - stage shunt vanes (120) starts from a position lower than the impeller shaft head (151) and is arranged in a radial pattern on the impeller disk (100). An air - flow channel space (140) is formed between the first - stage guide vanes (110) and the second - stage shunt vanes (120). At the blade ends (131) of the first - stage guide vanes (110) and the second - stage shunt vanes (120), third - stage forked vanes (130) are formed on the impeller disk (100). The third - stage forked vanes (130) are bent and offset in the reverse direction of the bending direction of the guide plate (111), and a forked space (132) for suppressing backflow is formed between them and the blade ends (131).

2. The multi-stage impeller structure for an electric motor according to claim 1, wherein, The height of the second - stage shunt vanes (120) is between 1 / 2 and 2 / 3 of the height of the first - stage guide vanes (110).

3. A multi-stage impeller structure for an electric motor according to claim 1, characterized in that The angle θ by which the third - stage forked vanes (130) deviate from the blade ends (131) ranges from 0° to 60°.

Images