Novel powder concentrator rotor sealing structure

Abstract

The utility model discloses a novel powder concentrator rotor sealing structure which comprises a powder concentrator shell, a powder concentrator rotor and a rotor protection cover, the powder concentrator rotor is rotatably installed in the powder concentrator shell, the rotor protection cover is fixedly connected with the powder concentrator shell, a rotor guide vane is arranged on a rotor frame, and the rotor guide vane is fixedly connected with the powder concentrator shell. And the rotor guide vanes are distributed in a circumferential array. When the airflow carrying the fine powder impacts the sealing groove, the airflow is in contact with the rotor guide vane, the airflow direction is forcibly changed to form a swirling airflow, and the swirling airflow moves downwards in a swirling mode to be matched with a part of supplementary airflow to lock air in the area, and the other part of supplementary airflow continues to form a new swirling airflow along the rotor guide vane. The rotor of the powder concentrator does circular motion, so that the airflow generates centrifugal force, the supplemented airflow continues to be subjected to air locking, the airflow cannot directly pass through the residual motion gaps, the airflow is prevented from flowing away from the reserved motion gaps, the fineness and the specific surface area of a finished product are guaranteed, and the powder selecting effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of air classifier sealing technology, specifically relating to a novel air classifier rotor sealing structure. Background Technology

[0002] Vertical roller mills are widely used grinding equipment in the building materials, chemical, and steel industries. They are mainly used for grinding, drying, and classifying cement raw materials, clinker, raw coal, and blast furnace slag from steel plants. Currently, most vertical roller mills both domestically and internationally employ dynamic and static high-efficiency cage classifiers in their classification equipment.

[0003] The cage classifier mainly consists of a transmission device, a drive shaft, and a cage rotor. The airflow carrying high-concentration dust first passes through the stationary blade area, where large dust particles are blocked. Most of the remaining finer dust is separated by the rotating rotor blade area. The separated fine particles are carried by the airflow through the rotor blades into the middle of the rotor, which is connected to the fine powder outlet housing. The fine powder is then sent from the fine powder outlet to the finished product dust collector. A small portion of the finer dust enters the middle of the rotor through the sealing gap between the rotor and the rotor seal cover, and the classifier housing, and is sent from the fine powder outlet to the finished product dust collector. This portion of dust does not pass through the rotor blade area and is not separated. Therefore, the size and consistency of the sealing gap largely determine whether the fineness or specific surface area of ​​the finished product meets the standards.

[0004] In typical designs, labyrinth seals are usually used in the area between the rotor and the rotor seal cover, and between the classifier housing and the rotor. Labyrinth seals require high machining precision, are difficult to assemble, have a relatively complex system layout, and are prone to leakage. Due to these limitations, labyrinth seals may experience relative friction during high-speed rotor operation, and replacement is relatively difficult. These issues need to be addressed to effectively improve the fineness or specific surface area of ​​the finished product and ensure its usability. Utility Model Content

[0005] The purpose of this utility model is to provide a novel rotor sealing structure for a classifier, in order to solve the problem that in existing equipment, dust-laden airflow easily passes through the reserved movement gap without being screened, resulting in low finished product fineness and specific surface area compliance rates.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel air classifier rotor sealing structure, comprising an air classifier housing, an air classifier rotor, and a rotor protective cover. The air classifier rotor is rotatably installed inside the air classifier housing, and the rotor protective cover is fixedly connected to the air classifier housing. The air classifier rotor includes a rotor frame, and rotor guide vanes are provided on the rotor frame. The rotor guide vanes are arranged in a circumferential array.

[0007] Preferably, a sealing groove is provided between the classifier housing and the rotor protective cover, and an angle steel support is provided on the rotor frame. The angle steel support is adjacent to the sealing groove, and the rotor guide vanes are fixedly installed on the rotor frame through the angle steel support and are located in the sealing groove.

[0008] Preferably, the rotor guide vane includes an extended wall and an arc-shaped wall, the extended wall is rectangular, the arc-shaped wall is C-shaped, and the arc-shaped wall is fixedly installed on the outer wall of one side of the extended wall.

[0009] Preferably, the outer wall of the arc-shaped wall on the side away from the extended wall is a beveled wall.

[0010] Preferably, the rotor frame is provided with a plurality of rotor blades arranged in a circumferential array, and guide blades are provided on the outer side of the rotor frame.

[0011] The technical effects and advantages of this utility model are as follows: When the airflow carrying fine powder impacts the sealing groove, it will come into contact with the rotor guide vanes and be forced to change the airflow direction to form a swirling airflow. After passing through the obliquely cut arc wall, it is vertically guided to contact the inner wall of the classifier housing and continues to swirle downwards. This swirling motion will partially cancel out the airflow that is added to the separate cavity, thus locking the airflow in this area. The other part of the added airflow will continue to form a new swirling airflow along the rotor guide vanes. Under the action of centrifugal force generated by the circumferential motion of the rotor frame, it will continue to lock the airflow of the next added airflow. The airflow cannot directly pass through the reserved movement gap, thus solving the problem of airflow flowing away from the reserved movement gap, ensuring the fineness and specific surface area of ​​the finished product, and improving the powder classification effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the internal structure of the air classifier housing of this utility model;

[0013] Figure 2 This is an enlarged structural diagram of point A in this utility model;

[0014] Figure 3 This is a schematic diagram of the rotor guide vane structure of this utility model.

[0015] In the figure: 1. Air classifier housing; 11. Air duct; 12. Air ring; 2. Air classifier rotor; 21. Rotor frame; 3. Rotor protective cover; 4. Rotor guide vanes; 41. Extension wall; 42. Arc wall; 5. Sealing groove; 6. Angle steel support; 7. Rotor blades; 8. Guide vanes. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides, for example Figure 1-3 The novel air classifier rotor sealing structure shown includes an air classifier housing 1, an air classifier rotor 2, and a rotor protective cover 3. The air classifier rotor 2 is rotatably mounted inside the air classifier housing 1, and the rotor protective cover 3 is fixedly connected to the air classifier housing 1. The air classifier rotor 2 includes a rotor frame 21, on which rotor guide vanes 4 are arranged in a circumferential array. A sealing groove 5 is provided between the air classifier housing 1 and the rotor protective cover 3. An angle steel support 6 is provided on the rotor frame 21, adjacent to the sealing groove 5. The rotor guide vanes 4 are fixedly mounted on the rotor frame 21 through the angle steel support 6 and are located within the sealing groove 5. Several rotor blades 7 are arranged in a circumferential array on the rotor frame 21, and guide vanes 8 are provided on the outer side of the rotor frame 21. Figure 1The middle arrow indicates the direction of the dust-laden airflow during mill powder classification. The airflow enters the classifier housing 1 through the air duct 11 and then enters the mill interior through the air ring 12. At the air ring 12, the airflow carrying high-concentration dust continues to flow upward to the guide vanes 8. Guided by the exhaust fan, the airflow enters the classification area and is cut by the high-speed rotating rotor blades 7. The airflow carrying the finished fine powder flows into the middle of the rotor frame 21 and then through the classifier outlet to the finished dust collector. A small portion of the finer dust passes through the sealing groove 5 between the rotor frame 21, the rotor protective cover 3, and the classifier housing 1. When the airflow carrying the fine powder impacts the sealing groove 5, it comes into contact with the rotor guide vanes 4 and is guided by the C-shaped arc wall 42 of the rotor, forcibly changing the airflow direction to form a swirling airflow. The rotor frame 21 is constantly in circular motion, and this swirling airflow is affected by centrifugal force, ultimately forming a swirling airflow along the rotor frame 21 in each individual sealed cavity. The swirling airflow moving in the linear direction is vertically guided by the obliquely cut arc wall 42 to contact the inner wall of the classifier housing 1 and continues to swirle downwards. This downward swirling airflow cancels out part of the airflow added into the separate cavity, locking the airflow in this area. The other part of the added airflow continues to form a new swirling airflow along the rotor guide vanes 4. Under the action of centrifugal force generated by the circumferential motion of the rotor frame 21, it continues to lock the airflow of the next added airflow. From this point on, when the airflow carrying fine powder flows through the cavity formed between the two rotor guide vanes 4, it can only form a swirling airflow in this cavity and lock the airflow of the next airflow. The airflow cannot directly pass through the reserved movement gap. Compared with the existing classifier, this application solves the problem of airflow flowing away from the movement gap by setting a rotor guide vane 4 with an obliquely cut arc wall 42 at one end, thereby ensuring the fineness and specific surface area of ​​the finished product and improving the powder classification effect.

[0018] Specifically, the rotor guide vane 4 includes an extending wall 41 and an arc-shaped wall 42. The extending wall 41 is rectangular, and the arc-shaped wall 42 is C-shaped. The arc-shaped wall 42 is fixedly installed on the outer wall of one side of the extending wall 41. The outer wall of the arc-shaped wall 42 on the side away from the extending wall 41 is a beveled wall. (See attached diagram.) Figure 2 and Figure 3As shown, the rotor guide vanes 4 are circumferentially distributed and connected to the angle steel support 6 via the extension wall 41, and fixed on the rotor frame 21. A sealing groove 5 is formed between the classifier housing 1 and the rotor protective cover 3. Two adjacent rotor guide vanes 4 can cut the sealing groove 5 into several arc-shaped cavities with equal area. The rotor guide vanes 4 rotate circumferentially within the circumferential sealing groove 5 formed by the classifier housing 1 and the rotor protective cover 3. During classification, when the airflow enters the classifier housing 1 and contacts the rotor guide vanes 4, the C-shaped arc wall 42 will forcibly change the direction of the airflow entering the arc-shaped cavity, forming a swirling airflow along the tangential direction of the rotor frame 21. The flow of air is partially blocked by the supplementary airflow into this cavity. The remaining supplementary airflow is then re-formed into a swirling airflow through the C-shaped rotor guide vanes 4 to continuously lock the airflow, preventing the dust-laden airflow from passing through the reserved movement gap and ensuring the dust selection effect. The rotor guide vanes 4 are vertically mounted on the rotor frame 21 by angle steel supports 6, and the arc-shaped wall 42 is designed with a bevel, which can better guide and direct the airflow, forcibly change the direction of the airflow swirling to form a strong swirling airflow, and counteract the supplementary airflow to lock the airflow, preventing the dust-laden airflow from entering the reserved movement gap and avoiding the airflow from escaping directly without going through the classification and selection zone.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel rotor sealing structure for an air classifier, characterized in that: The classifier includes a housing (1), a rotor (2), and a rotor protective cover (3). The rotor (2) is rotatably installed inside the housing (1). The rotor protective cover (3) is fixedly connected to the housing (1). The rotor (2) includes a rotor frame (21). Rotor guide vanes (4) are provided on the rotor frame (21). The rotor guide vanes (4) are arranged in a circumferential array.

2. The novel rotor sealing structure for a classifier according to claim 1, characterized in that: A sealing groove (5) is provided between the air classifier housing (1) and the rotor protective cover (3). An angle steel support (6) is provided on the rotor frame (21). The angle steel support (6) is adjacent to the sealing groove (5). The rotor guide vane (4) is fixedly installed on the rotor frame (21) through the angle steel support (6) and is located in the sealing groove (5).

3. The novel rotor sealing structure for a classifier according to claim 1, characterized in that: The rotor guide vane (4) includes an extension wall (41) and an arc-shaped wall (42). The extension wall (41) is rectangular, and the arc-shaped wall (42) is C-shaped. The arc-shaped wall (42) is fixedly installed on the outer wall of one side of the extension wall (41).

4. The novel rotor sealing structure for a classifier according to claim 3, characterized in that: The outer wall of the arc-shaped wall (42) on the side away from the extended wall (41) is a beveled wall.

5. The novel rotor sealing structure for a classifier according to claim 1, characterized in that: The rotor frame (21) is provided with a plurality of rotor blades (7) arranged in a circular array, and guide blades (8) are provided on the outer side of the rotor frame (21).

Images