A sealing structure of a powder selector

Abstract

The utility model relates to air powder concentrator technical field discloses a kind of sealing structure of powder concentrator. Air powder concentrator sealing structure includes throwing material disc, sealing sheet and cage rotor sealing blade. Air powder concentrator shell feed inlet below is provided with throwing material disc and sealing sheet and constitutes annular sealing structure upper portion, simultaneously, the corresponding annular sealing blade of cage rotor upper end is set and constitutes sealing structure lower portion, the passage between upper and lower sealing structure forms labyrinth seal, to improve the sealing effect of powder concentrator, to solve the technical problem such as coarse, finished product qualification rate low.

Description

Technical Field

[0001] This utility model relates to the technical field of air classifiers. In particular, it relates to a sealing structure for an air classifier. Furthermore, this utility model also relates to an OPS air classifier that includes the aforementioned sealing structure. Background Technology

[0002] Existing air classifiers, such as the OSP (Optical State Partition) air classifier (patent 93246146.8), have the advantages of high output and small size. However, they suffer from low separation efficiency, low separation accuracy (i.e., passing off coarse particles), and inability to separate finer products. These issues are mainly due to improper sealing at the joint between the upper part of the cage rotor and the air classifier's housing, leading to air leakage. Utility Model Content

[0003] The main purpose of this utility model is to provide a sealing structure for a cage rotor of an air classifier, so as to solve the problem that a large amount of coarse powder enters the fine powder of the product due to improper sealing between the cage rotor and its shell.

[0004] According to one aspect of the present invention, a sealing structure for a cage rotor of an air classifier is provided, comprising an air classifier housing, a feed inlet, a cage rotor rotatable around a main shaft, a spreading disc and a sealing plate connected to the housing, and sealing blades connected to the cage rotor, wherein the sealing blades rotatable together with the cage rotor and the sealing plate fixed below the spreading disc form a labyrinth, a spreading disc is installed below the feed inlet on the housing, the spreading disc is in the form of an integral ring, a ring composed of multiple arc-shaped sealing plates is evenly installed along the circumferential direction below the spreading disc, and the outer circumference of the cage rotor is provided with evenly distributed sealing blades.

[0005] Furthermore, the material spreading disc can be fixed to the housing by bolting or welding.

[0006] Furthermore, the ring composed of multiple sealing plates can be evenly fixed along the circumference below the spreading disc by bolt connection, so as to facilitate the installation and removal of the sealing plates and the disassembly of the cage rotor.

[0007] Furthermore, the annular sealing blades can be fixed to the top of the cage rotor by welding and can rotate together with the cage rotor.

[0008] Furthermore, the material spreading disc and multiple arc-shaped sealing plates set below the feed inlet constitute the upper part of the sealing structure that is integrated with the powder selection shell; the sealing blades set above the cage rotor constitute the lower part of the sealing structure that is integrated with the cage rotor; the channels formed by the installation and cooperation of the upper and lower parts of the sealing structure constitute a labyrinth sealing structure, thereby achieving the sealing between the cage rotor and the shell.

[0009] This utility model has the following beneficial effects:

[0010] This invention relates to a sealing structure for an air classifier. It comprises a multi-channel, narrow internal labyrinth seal structure consisting of rotatable annular sealing blades and fixed, non-rotating annular sealing plates. This creates multiple effective seals between the cage rotor and the housing, ensuring that only qualified fine powder processed by the cage rotor can enter the upper part of the housing and exit through the discharge port. After passing through a dust collection device, it becomes a qualified product, preventing coarse particles present in the housing from escaping between the cage rotor and the housing. Therefore, the improved air classifier significantly increases its classification efficiency, selects finer powders, and achieves higher output. It also increases the output of the air classifier, thereby increasing the overall output of the pulverizing system and reducing energy consumption. Attached Figure Description

[0011] The accompanying drawings, which constitute a part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model. In the drawings:

[0012] Figure 1 This is a schematic diagram of the overall structure of an OSP classifier in the existing technology.

[0013] Figure 2 This is a schematic diagram of the sealing structure of a preferred powder classifier according to this utility model. Detailed Implementation

[0014] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0015] Figure 1 This is a schematic diagram of the OSP classifier in the prior art; its housing (2) contains a cage rotor (6), which is mounted at the lower end of the main shaft (7) and can rotate with the main shaft (7); the upper part of the housing (2) has a feed inlet (1), the air inlet (10) is located in the middle of the housing (2), and the coarse powder outlet (8) is located at the bottom of the housing (2); when the coarse and fine powder materials to be separated are fed into the feed inlet (1), they are dispersed by the high-speed airflow introduced from the air inlet (10). When the material is fed into the cage rotor (6), the coarse powder material is struck by the high-speed rotating cage rotor (6) and forced to fall and be discharged from the coarse powder outlet (8); qualified fine powder enters the cage rotor (6) and is carried out by the airflow from the fine powder outlet (9) at the top of the housing (2), and is collected by the external dust collection device to become fine powder product. Figure 1It can be seen that the seal between the fixed shell (2) and the uppermost feeding disc (3) of the cage rotor (6) is only formed by a simple gap (11). This may make it easier for coarse materials to directly enter the fine powder outlet (9) under the action of high-speed airflow, thereby reducing the powder selection efficiency. In order to maintain product quality, the air volume of the powder classifier can only be reduced or the rotation speed of the cage rotor (6) can be increased, which will cause problems such as reduced output.

[0016] Figure 2 The sealing structure of this utility model is... Figure 1 A partial enlarged view of the modified sealing structure below the feed inlet. The sealing structure of this utility model consists of a feed inlet (1), a classifier housing (2), a spreading disc (3), a sealing plate (4), a sealing blade (5), and a cage rotor (6). The original spreading disc (3) above the cage rotor (6) is changed to be fixed to the classifier housing (2). The fixing method can be welding or bolt connection. The position is located below the feed inlet (1) and above the sealing blade (5). A sealing plate (4) is added below the spreading disc (3). The sealing plate (4) is fixed to the spreading disc (3) by bolt connection. Multiple pieces are evenly distributed along the circumference to form an annular sealing plate (4) that is completely around the spreading disc (3). The spreading disc (3) and the sealing plate (4) constitute the upper part of the annular sealing structure. The original feeding disc (3) above the cage rotor (6) is removed and replaced with a sealing blade (5). The sealing blade (5) is fixed to the cage rotor (6) by welding. The sealing blade (5) and the cage rotor (6) together form the lower part of the annular sealing structure. The upper and lower parts of the annular sealing structure are arranged as follows: Figure 2 As shown, the sealing plate (4) is inserted into the groove of the sealing blade (5) while ensuring the gap. The channel formed by the sealing plate (4) and the sealing blade (5) constitutes a labyrinth seal.

[0017] The sealing structure of this utility model is easy to install and assemble. Simply position and install the cage rotor (6) in place, and then fix the sealing plate (4) along the circumferential direction to the feeding plate (3) to form a labyrinth sealing channel. Disassembly is performed by reversing the installation steps. This effectively improves the sealing effect of the air classifier and can effectively prevent coarse particles on the outside of the cage rotor (6) from entering the inside of the cage rotor through the upper gap and contaminating the already sorted fine powder. This greatly avoids coarse particles from being carried away by the air classifier and effectively improves the air classification efficiency and the finished product qualification rate.

[0018] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

[0019] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various variations and substitutions can be made by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing structure for an air classifier, comprising a feed inlet (1), an air classifier housing (2), a feeding disc (3), a sealing plate (4), sealing blades (5), and a cage rotor (6), characterized in that, A labyrinth seal is formed between the air classifier housing (2) and the cage rotor (6); A feeding disc (3) is provided below the feed inlet (1) on the housing (2) of the air classifier. The feeding disc (3) is an integral part along the entire circumference. Multiple arc-shaped sealing plates (4) are evenly installed along the circumference below the annular spreading disc (3) to form an annular structure; A sealing blade (5) is provided above the cage rotor (6), and the sealing blade (5) is an integral part along the entire circumference.

2. The sealing structure of the air classifier as described in claim 1, characterized in that, The feeding disc (3) can be fixed to the classifier housing (2) by bolt connection or welding.

3. The sealing structure of the air classifier as described in claim 1, characterized in that, Multiple sealing discs (4) need to be evenly fixed in the circumferential direction below the spreading disc (3) by bolt connection to form a ring-shaped sealing disc.

4. The sealing structure of the air classifier as described in claim 1, characterized in that, The sealing blade (5) is fixed to the cage rotor (6) by welding to form a cage structure.

5. The sealing structure of the air classifier as described in claim 4, characterized in that, The material spreading disc (3) and multiple arc-shaped sealing discs (4) set below the feed inlet (1) constitute the upper part of the sealing structure integrated with the air classifier housing (2); the sealing blades (5) set above the cage rotor (6) constitute the lower part of the sealing structure integrated with the cage rotor (6); the channel formed by the installation and cooperation of the upper and lower parts of the sealing structure constitutes the labyrinth sealing structure.

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