A high-efficiency powder concentrator

Abstract

The utility model provides a kind of efficient powder concentrator, it is related to powder concentrator technical field, it includes shell, at least one upper air inlet and at least one lower air inlet are circumferentially provided on the outer wall surface of shell;Airflow guide vane assembly, it is located inside shell and extends to the boundary of shell upper portion and shell lower portion, for the airflow from upper air inlet and / or lower air inlet is guided into rotating airflow;Rotor vane assembly, it is located inside shell and is located inside airflow guide vane assembly, for guiding part powder flow turns to air outlet;Rotor vane assembly and the airflow guide vane assembly between form with the powder selection channel that is connected with feed inlet and discharge port, and in the rotor upper portion is provided with a secondary distribution plate in primary distribution plate middle portion.Setting secondary distribution plate in the utility model compared with prior art, powder can make powder in powder selection path stay longer, to ultimately improve the efficiency of powder selection.

Description

Technical Field

[0001] This utility model relates to the field of air classifier technology, specifically to a high-efficiency air classifier. Background Technology

[0002] In the cement grinding process, air classifiers are used to ensure that particles reach a certain fineness while preventing over-grinding of already crushed particles. The efficiency of the air classifier directly affects the output of the grinding system. Current air classifiers have only one classifying chamber and perform only one classification cycle, resulting in low efficiency. Although increasing the air volume and air-to-solid ratio can improve efficiency, the effect is not proportional. Furthermore, increasing the air volume requires a larger air volume and a larger baghouse dust collector, which is relatively expensive. This also increases the system's motor power, making it uneconomical to use a larger air classifier system simply to improve the air-to-solid ratio. Utility Model Content

[0003] To address the problem of low efficiency in air classifiers, this invention provides a high-efficiency air classifier by adding an extra air classifier chamber, thereby improving air classifier efficiency.

[0004] The technical solution adopted in this utility model is:

[0005] A high-efficiency air classifier includes the following main structures:

[0006] The shell is hollow inside, and at least one upper air inlet and at least one lower air inlet are circumferentially opened on the outer wall surface of the shell; an air outlet is opened at the center of the top of the shell, a feed inlet is opened between the air outlet and the outer wall of the shell, and a discharge outlet connected to the feed inlet is opened at the bottom of the shell.

[0007] An airflow guide vane assembly, located inside the housing and extending to the boundaries of the upper and lower parts of the housing, is used to guide airflow from the upper air inlet and / or the lower air inlet into a rotating airflow.

[0008] The rotor blade assembly is located inside the housing and inside the airflow guide blade assembly, and is used to guide part of the powder to flow to the air outlet; a powder selection channel is formed between the rotor blade assembly and the airflow guide blade assembly, which is connected to the feed inlet and the discharge outlet;

[0009] The drive assembly has its working end fixedly connected to the rotor blade assembly and is used to drive the rotor blade assembly to rotate.

[0010] in,

[0011] A primary feeding disc is provided in the powder classification channel and on the upper part of the rotor blade assembly, and a secondary feeding disc is provided in the middle part of the rotor blade assembly. When the high-efficiency powder classifier is working, the raw powder from the feed inlet is scattered by the primary and secondary feeding discs respectively. The large-diameter powder is discharged through the discharge outlet, and the small-diameter powder is discharged through the air outlet along with the airflow.

[0012] In one embodiment disclosed in this application,

[0013] A spacer ring is provided on the inner wall surface of the housing, and the spacer ring is connected to the airflow guide vane assembly;

[0014] The partition ring is located between the upper air inlet and the lower air inlet.

[0015] In one embodiment disclosed in this application, the airflow guide vane assembly further includes:

[0016] The upper airflow guide vane assembly has one end connected to the lower wall of the top of the housing and the other end connected to the upper wall of the spacer ring; multiple upper airflow channels are circumferentially formed on the side wall of the upper airflow guide vane assembly with its own central axis as the axis of rotation.

[0017] The lower airflow guide vane assembly has one end connected to the lower wall of the partition ring and the other end connected to the upper wall of the bottom of the housing; multiple lower airflow guide channels are circumferentially formed on the side wall of the lower airflow guide vane assembly with its own central axis as the axis of rotation.

[0018] The airflow direction formed by the upper airflow channel and / or the lower airflow channel forms a preset offset angle with the radial direction of the airflow guide vane assembly; the offset angle ranges from 50° to 70°.

[0019] In one embodiment disclosed in this application, the driving component includes:

[0020] The motor is located on the outer wall surface of the air outlet;

[0021] A rotor shaft, one end of which is located at the output end of the motor, and the other end extends into the interior of the housing; a connecting frame, which is located on the rotor shaft and connected to the rotor blade assembly.

[0022] In one embodiment disclosed in this application, the rotor blade assembly further includes:

[0023] The upper powder-selecting rotor has its upper end connected to the air outlet and its lower end connected to the top end face of the connecting frame; multiple air outlet channels are circumferentially opened on the side wall of the upper powder-selecting rotor with its own central axis as the axis of rotation.

[0024] The lower powder-selecting rotor has its upper end connected to the bottom end face of the connecting frame; multiple air outlet channels are circumferentially opened on the side wall of the lower powder-selecting rotor with its own central axis as the rotation axis.

[0025] In one embodiment disclosed in this application, the high-efficiency air classifier further includes:

[0026] One-time feeding disc;

[0027] The primary spreading disc is located on top of the upper powder sorting rotor and corresponds to the feed inlet. It is used to collect the powder entering from the feed inlet and spread the powder in a scattered manner.

[0028] In one embodiment disclosed in this application, the high-efficiency air classifier further includes:

[0029] One material stop ring;

[0030] The baffle ring is mounted on the upper airflow guide vane assembly and corresponds to the primary material spreading disc in spatial position. It is used to form a barrier for the powder that is thrown by the primary material spreading disc, so that the powder is not thrown outside the upper airflow guide vane assembly.

[0031] In one embodiment disclosed in this application, the high-efficiency air classifier further includes:

[0032] Secondary feeding disc;

[0033] The secondary feeding disc is mounted on the connecting frame;

[0034] The secondary spreading disc is located within the powder selection channel and downstream of the primary spreading disc on the powder selection path, and is used to spread the powder in the powder selection channel in a secondary manner.

[0035] In one embodiment disclosed in this application, the high-efficiency air classifier further includes:

[0036] Collection ring;

[0037] The collecting ring is located in the powder selection channel and is disposed at the lower part of the upper airflow guide vane assembly or at the upper part of the lower airflow guide vane assembly.

[0038] The collecting ring is used to gather the powder after it has been scattered by the first spreading disc, so that the powder is gathered and guided to the second spreading disc.

[0039] The working process and beneficial effects of this utility model are as follows:

[0040] The powder to be selected enters the housing through the feed inlet. Inside the housing, the powder moves along the selection channel under its own gravity. The selection channel is equipped with primary and secondary feeding discs, which disperse the material and increase the residence time of the powder within the selection channel. This facilitates contact between the airflow and the powder, improving selection efficiency. During operation, the powder first comes into contact with the airflow entering from the upper air inlet. Fine powder with smaller particle sizes is carried by the airflow into the rotor blade assembly and then discharged through the air outlet as the finished product. Larger particles, clumps, and unseparated fine powder continue to fall into the lower selection channel corresponding to the lower air inlet. In this lower selection channel, the powder undergoes secondary selection by the airflow. Similarly, the airflow will blow the remaining fine powder with smaller particle size into the rotor blade assembly, and the fine powder will enter the interior of the rotor blade assembly through the rotor blade assembly. Driven by the airflow, it will be discharged and collected in the direction of the air outlet. The remaining larger particles and powder clumps will enter the discharge port through the powder selection channel and be discharged. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a cross-sectional view of the high-efficiency air classifier disclosed in this embodiment;

[0043] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0044] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0045] Figure 4 A schematic diagram of the main structure of the airflow guide vane assembly;

[0046] Figure 5 A schematic diagram of the AA-direction cross-sectional structure of the airflow guide vane assembly;

[0047] Figure 6 This is a schematic diagram showing the airflow direction when the lower airflow guide vane assembly and the lower rotor vane assembly are in operation.

[0048] Figure label:

[0049] 1-Shell, 10-Feed inlet, 11-Upper air inlet, 12-Lower air inlet, 13-Spacer ring;

[0050] 2-Air outlet;

[0051] 3-Discharge port;

[0052] 4-Drive assembly, 40-Motor, 41-Rotor shaft, 42-Connecting frame;

[0053] 5-Rotor blade assembly, 50-Upper powder separator rotor, 501-Primary feeding disc, 51-Lower powder separator rotor, 510-Secondary feeding disc, 52-Air outlet duct;

[0054] 6-Airflow guide vane assembly, 60-Upper airflow guide vane assembly, 601-Baffle ring, 61-Lower airflow guide vane assembly, 611-Collecting ring, 6111-Baffle part, 6112-Collecting part, 62-Upper air guide channel, 63-Lower air guide channel;

[0055] A1 - Arrow, A2 - Arrow, A3 - Arrow, B1 - Arrow, G1 - Powder selection channel, P0 - Raw powder, P1 - Large particle size powder, P2 - Small particle size powder, V1 - Offset angle. Detailed Implementation

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0058] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings. Example

[0059] Please see Figure 1-6As shown, some embodiments of this application disclose a high-efficiency air classifier, which improves air classification efficiency compared to traditional air classifiers. The high-efficiency air classifier specifically includes several parts such as a housing 1, a drive assembly 4, a rotor blade assembly 5, and an airflow guide vane assembly 6.

[0060] The shell 1 is hollow inside. At least one upper air inlet 11 and at least one lower air inlet 12 are formed on the outer wall of the shell 1. When there are a large number of upper air inlets 11 and lower air inlets 12, they are circumferentially distributed around the central axis of the shell 1, allowing multiple airflows to enter the interior of the shell 1. A connecting air outlet 2 and a discharge outlet 3 are respectively provided at both ends of the shell 1. The air outlet 2 is located at the top of the shell 1 and is used to discharge small-diameter powder particles, while the discharge outlet 3 is located at the bottom of the shell 1 and is used to discharge large-diameter powder particles P1.

[0061] The airflow guide vane assembly 6 is disposed inside the housing 1 and extends to the boundary between the upper and lower parts of the housing 1, for guiding the airflow from the upper air inlet 11 and / or the lower air inlet 12 into a rotating airflow. Figure 6 (in the direction indicated by the middle arrow A2)

[0062] The rotor blade assembly 5 is located inside the housing 1 and inside the airflow guide blade assembly 6, and is used to guide part of the powder to flow to the air outlet 2; a powder selection channel G1 is formed between the rotor blade assembly 5 and the airflow guide blade assembly 6, which is connected to the feed inlet 10 and the discharge outlet 3.

[0063] The working end of the drive assembly 4 is fixedly connected to the rotor blade assembly 5 and is used to drive the rotor blade assembly 5 to rotate. When the drive assembly 4 drives the high-efficiency classifier to work, the raw powder P0 from the feed inlet 10 passes through the classifier channel G1, where the large-diameter powder P1 is discharged through the discharge outlet 3, and the small-diameter powder P2 is discharged through the air outlet 2 along with the airflow.

[0064] To facilitate better fixation of the airflow guide vane assembly 6 and, to a certain extent, functionally form upper and lower powder separation chambers, a partition ring 13 is provided on the inner wall surface of the housing 1. The outer wall surface of the partition ring 13 is connected to the inner wall surface of the housing 1, and the inner wall surface of the partition ring 13 is connected to the inner wall surface of the airflow guide vane assembly 6. The partition ring 13 divides the interior of the housing 1 into a first air intake area (upper powder separation area / chamber) into which airflow enters from multiple upper air inlets 11, and a second air intake area (lower powder separation area / chamber) into which airflow enters from multiple lower air inlets 12, thus separating the airflow in the two areas and minimizing mutual interference between the airflow in the two areas.

[0065] The airflow guide vane assembly 6 disposed inside the aforementioned housing 1 is used to guide the airflow entering from each upper air inlet 11 and each lower air inlet 12 into the interior of the housing 1, thereby forming a spiral airflow. Figure 6 (The direction indicated by the middle arrow A2).

[0066] For details, see Figure 4 and Figure 5 The airflow guide vane assembly 6 includes an upper airflow guide vane assembly 60 and a lower airflow guide vane assembly 61. The upper end of the upper airflow guide vane assembly 60 is connected to the inner top of the housing 1, and the lower end is connected to the upper top of the partition ring 13. The upper end of the lower airflow guide vane assembly 61 is connected to the lower bottom of the partition ring 13, and the lower end is connected to the inner bottom of the housing 1. Multiple upper airflow guide channels 62 are circumferentially formed on the side wall of the upper airflow guide vane assembly 60 with its own central axis as the axis of rotation. Similarly, multiple lower airflow guide channels 63 are circumferentially formed on the side wall of the lower airflow guide vane assembly 61 with its own central axis as the axis of rotation. These channels are used to guide the airflow entering through the upper air inlet 11 and the lower air inlet 12 to form a spiral flow and flow into the interior of the housing 1. The airflow entering the interior of the housing 1 is distributed as evenly as possible to disperse the axial impact force of the airflow entering the interior of the housing 1 on the powder. It is worth noting that in specific implementation scenarios, the upper airflow guide vane assembly 60 and the lower airflow guide vane assembly 61 are usually coaxially arranged.

[0067] See also Figure 5 The upper airflow guide vane assembly 60 and the lower airflow guide vane assembly 61 are basically the same in structure and function. Taking the lower airflow guide vane assembly 61 as an example, in order to make the airflow passing through the airflow guide vane assembly 6 form a rotating flow, the air duct direction formed by the lower air guide channel 63 and the radial direction of the airflow guide vane assembly form a preset offset angle V1; the range of the offset angle V1 is approximately 50°-70°.

[0068] The rotor blade assembly 5 inside the housing 1 is located inside the airflow guide blade assembly 6 (closer to the center of the housing 1) in terms of spatial layout. The rotor blade assembly 5 and the airflow guide blade assembly 6 form a powder selection channel G1. The raw powder P0 from the feed inlet 10 is mainly air-separated through the powder selection channel G1 and then discharged from the discharge outlet 3.

[0069] The rotor blade assembly 5 guides the airflow entering the housing 1 to the outlet 2, simultaneously performing air separation during the guidance process. As mentioned earlier, the rotor blade assembly 5 is powered by the drive assembly 4. Spatially, the drive assembly 4 can be positioned on the outer wall of the outlet 2. The working end of the drive assembly 4 drives the rotor blade assembly 5 to rotate, causing the airflow within the powder separation channel, before entering the rotor blade assembly 5, to cooperate with the airflow guide blade assembly 6. The rotation changes the direction of the airflow, creating a spiral airflow within the powder separation channel G1. The rotor blade assembly 5 then experiences this spiral airflow... Figure 6 Under the influence of the arrow B1, an upward airflow direction will be formed. Among them, powder with a smaller particle size can pass through the rotor blade assembly 5 and be discharged into the air outlet 2 under the action of the airflow.

[0070] Specifically, the drive assembly 4 includes a motor 40, a rotor shaft 41, and a connecting frame 42. The motor 40 is mounted on the outer wall of the air outlet 2, and the rotor shaft 41 is mounted on the output end of the motor 40, enabling the motor 40 to drive the rotor shaft 41 to rotate. The connecting frame 42 is mounted on the outer wall of the rotor shaft 41, and the connecting frame 42 is located inside the rotor blade assembly 5 and connected to the rotor blade assembly 5. That is, the rotor shaft 41 drives the connecting frame 42 to rotate, thereby causing the rotor blade assembly 5 to rotate.

[0071] In a specific implementation, the rotor blade assembly 5 includes an upper classifying rotor 50 and a lower classifying rotor 51. The upper end of the upper classifying rotor 50 is connected to the air outlet 2, and it should be noted that this connection refers to gas connection. The air outlet 2 is not structurally connected to the upper classifying rotor 50, but its lower end is connected to the upper side of the connecting frame 42. The upper end of the lower classifying rotor 51 is connected to the lower side of the connecting frame 42, and its lower end faces the discharge port 3. Multiple air outlet channels 52 are formed on the side wall of the upper classifying rotor 50 with its central axis as the axis of rotation, and multiple air outlet channels 52 are also formed on the side wall of the lower classifying rotor 51 with its central axis as the axis of rotation. These multiple air outlet channels 52 allow finer particles in the powder to enter. It should be noted that when the airflow enters the rotor blade assembly 5 through multiple air outlet channels 52, it will collide with the side walls of the upper powder-selecting rotor 50 and the lower powder-selecting rotor 51. With the cooperation of the aforementioned upper airflow guide vane assembly 60 or lower airflow guide vane assembly 61, the airflow is caused to form a spiral airflow in the powder-selecting channel G1. The airflow entering through the upper powder-selecting rotor 50 and / or the lower powder-selecting rotor 51 will also form a spiral airflow in the same direction. Figure 6As indicated by arrow B1, the central region of the spiral airflow moves upwards towards outlet 2, guiding fine powder into outlet 2 and collecting it. For larger particles, the centrifugal force generated by the spiral airflow is greater than the blowing force of the airflow entering the rotor axially, preventing them from being blown into the upper and lower classifying rotors 50 and 51. Instead, they continue to fall towards outlet 3 within the classifying channel due to gravity.

[0072] Larger particles falling through the powder selection channel G1 will gradually accelerate their descent speed under the influence of gravity, resulting in a shorter powder selection time and affecting the powder selection efficiency. To address this, a primary feeding disc 501 and a secondary feeding disc 510 are respectively installed inside the housing 1. Both the primary and secondary feeding discs 501 and 510 are L-shaped in cross-section. The bottom wall of the primary feeding disc 501 is located on the outer top of the upper powder selection rotor assembly 50, while the shorter side wall is close to the internal structure of the housing 1. When the original powder P0 enters the housing 1 through the feed inlet 10, it will first come into contact with the primary feeding disc 501. The primary feeding disc 501 collects and distributes the powder, thus increasing the powder dispersion effect. Driven by the rotation of the upper powder classifier rotor assembly 50, the powder on the primary feeding disc 501 is thrown towards the airflow guide vane assembly 6 under the action of centrifugal force. During the throwing process, the accumulated powder can be scattered, so that powders of different sizes can be better blown and screened by the airflow. Some powders with larger particle sizes will continue to fall in the powder classifier channel G1.

[0073] To improve air classification efficiency, the falling powder needs to be screened a second time. Therefore, this embodiment adds a secondary feeding disc 51. The secondary feeding disc 510 is set on the outer wall of the connecting frame 42. The secondary feeding disc 510 can collect and spread the incompletely classified powder that falls from the primary feeding disc 501. Under the influence of the rotating connecting frame 42, the powder on the secondary feeding disc 510 is once again thrown towards the direction of the lower airflow guide vane assembly 61, and the accumulated powder is scattered a second time, so that powders of different sizes can be separated. Then, the airflow entering from the lower airflow guide vane assembly 61 blows and screens the powder a second time, blowing some of the smaller powders into the lower powder classifier rotor 51. In addition, the secondary feeding disc 510 can reset the falling speed of the powder, thereby extending the powder's time in the powder classifier channel G1 and improving the powder classifier efficiency.

[0074] During the powder dispensing process of the primary dispensing disc 501 and the secondary dispensing disc 510, the powder tends to collide with the upper airflow guide vane assembly 60 and the lower airflow guide vane assembly 61 due to centrifugal force. Since the upper and lower airflow guide vane assemblies 60 and 61 do not rotate, some powder may be thrown to the outside of the airflow guide vane assembly 60 through the upper airflow guide channel 62 and the lower airflow guide channel 63, thus affecting the powder selection efficiency. To address this, a baffle ring 601 is provided on the inner wall of the upper airflow guide vane assembly 60, and a collecting ring 611 is provided on the inner wall of the lower airflow guide vane assembly 61. The baffle ring 601 can block the powder dispensing from the primary dispensing disc 501, preventing the powder from falling to the outside of the upper airflow guide vane assembly 60 through the upper airflow guide channel 62. The collecting ring 611 specifically includes a baffle part 6111 and a collecting part 6112. The baffle 6111 can block the powder thrown by the secondary feeding disc 510, preventing the powder from falling into the outer side of the lower airflow guide vane assembly 61 through the lower airflow guide channel 63. The collecting part 6112 is an inclined plate used to guide the powder in the powder selection channel G1 to the secondary feeding disc 510, so that the secondary feeding disc 510 can better throw the powder, thereby improving the powder selection efficiency. The baffle ring 601 and the collecting ring 611 can not only block the powder and prevent it from falling into the outer side of the airflow guide vane assembly 6, but also "collide" with the thrown powder, which can better disperse it to a certain extent. Since there are also powder clumps with larger particle sizes in the powder, during the throwing process of the primary feeding disc 501 and the secondary feeding disc 510, the powder clumps can collide with the baffle ring 601 and the collecting ring 611 respectively, so that the powder clumps break down into powder of different particle sizes for sorting.

[0075] As can be seen from the above structural description, the raw powder P0 enters the interior of the housing 1 through the feed inlet 10, passes sequentially through the upper powder classifying chamber composed of the upper powder classifying rotor 50 and the upper airflow guide vane assembly 60, and the lower powder classifying chamber composed of the lower powder classifying rotor 51 and the lower airflow guide vane assembly 61, and finally exits from the discharge outlet 3. During the powder classifying process, airflow from the upper air inlet 11 enters the upper powder classifying chamber, and airflow from the lower air inlet 12 enters the lower powder classifying chamber. Figure 6Taking the structure shown as an example, the airflow entering through the lower air inlet 12 is guided by the airflow guide vane assembly 61 (as shown by arrow A1). With the cooperation of the lower powder separator rotor 51, the airflow exhibits a rotating trend as shown by arrow A2. Some small-diameter powder P2, carried by the rotating airflow, enters the lower powder separator rotor 51 through the air outlet channel 52 (as shown by arrow A3) and continues to exhibit a rotating trend as shown by arrow B1. Driven by the rotating airflow, these small-diameter powder P2 pass through the lower powder separator rotor 51, the upper powder separator rotor 50, and the air outlet 2 in sequence before being discharged as qualified products. Meanwhile, the large-diameter powder P1 passes through the powder separator channel G1 and is discharged through the discharge port 3, where it either continues to participate in the next powder separator or is used as a defective product for other purposes.

[0076] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency air classifier, characterized in that, include: The shell is hollow inside. At least one upper air inlet and at least one lower air inlet are circumferentially opened on the outer wall of the shell. An air outlet is opened at the center of the top of the shell. A feed inlet is opened between the air outlet and the outer wall of the shell. A discharge outlet connected to the feed inlet is opened at the bottom of the shell. An airflow guide vane assembly, disposed inside the housing and extending to the boundary between the upper and lower parts of the housing, is used to guide airflow from the upper air inlet and / or the lower air inlet into a rotating airflow. A rotor blade assembly is disposed inside the housing and located inside the airflow guide blade assembly, for guiding a portion of the powder to the air outlet; a powder selection channel is formed between the rotor blade assembly and the airflow guide blade assembly, which communicates with the feed inlet and the discharge outlet; A drive assembly, the working end of which is fixedly connected to the rotor blade assembly, is used to drive the rotor blade assembly to rotate; in, The powder classifier is provided with a primary feeding disc in the upper part of the rotor blade assembly and a secondary feeding disc in the middle part of the rotor blade assembly. When the high-efficiency powder classifier is working, the raw powder from the feed inlet is scattered by the primary and secondary feeding discs. Large-diameter powder is discharged through the discharge outlet, and small-diameter powder is discharged through the air outlet along with the airflow.

2. The high-efficiency air classifier according to claim 1, characterized in that... : A spacer ring is provided on the inner wall surface of the housing, and the spacer ring is connected to the airflow guide vane assembly; The partition ring is located between the upper air inlet and the lower air inlet.

3. The high-efficiency air classifier according to claim 2, characterized in that, The airflow guide vane assembly further includes: The upper airflow guide vane assembly has one end connected to the lower wall of the top of the housing and the other end connected to the upper wall of the spacer ring; multiple upper airflow channels are circumferentially formed on the side wall of the upper airflow guide vane assembly with its own central axis as the axis of rotation. The lower airflow guide vane assembly has one end connected to the lower wall of the partition ring and the other end connected to the upper wall of the bottom of the housing; multiple lower airflow guide channels are circumferentially formed on the side wall of the lower airflow guide vane assembly with its own central axis as the axis of rotation. The airflow direction formed by the upper airflow channel and / or the lower airflow channel forms a preset offset angle with the radial direction of the airflow guide vane assembly.

4. The high-efficiency air classifier according to claim 3, characterized in that, The offset angle ranges from 50° to 70°.

5. The high-efficiency air classifier according to claim 1, characterized in that, The driving component includes: The motor is located on the outer wall surface of the air outlet; A rotor shaft, one end of which is located at the output end of the motor, and the other end extends into the interior of the housing; a connecting frame, which is located on the rotor shaft and connected to the rotor blade assembly.

6. The high-efficiency air classifier according to claim 5, characterized in that, The rotor blade assembly further includes: The upper powder-selecting rotor has its upper end connected to the air outlet and its lower end connected to the top end face of the connecting frame; multiple air outlet channels are circumferentially opened on the side wall of the upper powder-selecting rotor with its own central axis as the axis of rotation. The lower powder-selecting rotor has its upper end connected to the bottom end face of the connecting frame; multiple air outlet channels are circumferentially opened on the side wall of the lower powder-selecting rotor with its own central axis as the rotation axis.

7. The high-efficiency air classifier according to claim 6, characterized in that, The primary spreading disc is located on top of the upper powder sorting rotor and corresponds to the feed inlet. It is used to collect the powder entering from the feed inlet and spread the powder in a scattered manner.

8. The high-efficiency air classifier according to claim 7, characterized in that, This high-efficiency air classifier also includes: One material stop ring; The baffle ring is mounted on the upper airflow guide vane assembly and corresponds to the primary material spreading disc in spatial position. It is used to form a barrier for the powder that is thrown by the primary material spreading disc, so that the powder is not thrown outside the upper airflow guide vane assembly.

9. The high-efficiency air classifier according to claim 5, characterized in that: The secondary material spreading disc is mounted on the connecting frame; The secondary spreading disc is located within the powder selection channel and downstream of the primary spreading disc on the powder selection path, and is used to spread the powder in the powder selection channel in a secondary manner.

10. The high-efficiency air classifier according to claim 9, characterized in that, This high-efficiency air classifier also includes: Collection ring; The collecting ring is located inside the powder selection channel and is disposed at the lower part of the upper airflow guide vane assembly or at the upper part of the lower airflow guide vane assembly. The collecting ring is used to gather the powder after it has been scattered by the first spreading disc, so that the powder is gathered and guided to the second spreading disc.

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