Air sealing system of double-inlet and double-outlet coal mill

Abstract

The utility model discloses an air sealing system of a double-inlet and double-outlet coal mill, which relates to the technical field of double-inlet and double-outlet coal mills, and comprises a coal mill main body and filtering equipment, the upper parts of the two ends of the coal mill main body are fixedly communicated with channel mechanisms, and the other ends of the channel mechanisms are fixedly communicated with pressure stabilizing mechanisms; centrifugal force generated by rotation of the fan wheel causes the interior of the shell to be in a negative pressure state, external air enters the air inlet through the filtering device and flows outwards from the middle of the fan wheel so as to enter the circulation groove, the circulation groove is in an arc shape, the inner diameter of the circulation groove gradually changes, the inner diameter of the circulation groove close to the outlet gradually tends to be unchanged, and under the condition that the air volume is kept unchanged, the air volume is kept constant. When air just enters the position with the small inner diameter of the circulation groove, the air speed is high, after the air approaches the outlet, the air speed is gradually decreased and tends to be unchanged, the air enters the coal mill body through the channel mechanism in the open state, operation is conducted synchronously at the two ends, and therefore the sealing cavity of the coal mill body is kept in the stable pressure state, and overflowing of pulverized coal is reduced.

Description

Technical Field

[0001] This utility model relates to the field of double-inlet double-outlet coal mill technology, and in particular to a sealing air system for a double-inlet double-outlet coal mill. Background Technology

[0002] Coal mills are the main equipment in direct-fired coal pulverizing systems of thermal power plants. Their function is to grind raw coal into pulverized coal, which can then be fully combusted in the boiler, converting chemical energy into thermal energy to drive steam turbines for power generation. Double-inlet, double-outlet coal mills, in particular, have become an important component of boiler pulverizing systems in thermal power plants due to their advantages such as high continuous operation rate, convenient maintenance, stable grinding output and fineness, large storage capacity, rapid response, high operational flexibility, and wide applicability to various coal types.

[0003] However, in the existing technology, the traditional sealed air system has a relatively complex structure, containing multiple components and connection points. The inside of the coal mill is in a positive pressure state. During the operation of the coal mill, coal powder will attempt to leak from multiple connection points of the coal mill into the external environment under pressure, resulting in coal powder waste. Utility Model Content

[0004] The purpose of this utility model is to solve the problems existing in the prior art by proposing a double-inlet double-outlet sealing air system for coal mills.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-inlet double-outlet coal mill sealing air system, comprising a coal mill body and a filtration device, wherein a channel mechanism is fixedly connected to the upper part of both ends of the coal mill body, and a pressure stabilizing mechanism is fixedly connected to the other end of the channel mechanism. The pressure stabilizing mechanism is fixedly installed at the end of the coal mill body. The pressure stabilizing mechanism includes an end cover, a first side shell, an air inlet, a fan wheel, a second side shell, a flow groove, a gear set, a mounting shell, and a second servo motor. The fan wheel is rotatably installed in the middle of the shell formed by the first side shell and the second side shell. A flow groove is provided on the inner edge of the second side shell. The flow groove is located at the edge of the fan wheel. One end of the fan wheel is drivenly connected to the gear set, and the gear set is drivenly connected to the mounting shell.

[0006] Preferably, the gear set includes a primary gear, a double gear set, and a secondary gear, with one end of the fan wheel passing through the middle of the second side shell and fixedly connected to the secondary gear.

[0007] Preferably, the secondary gear meshes with the double tooth set, and the double tooth set meshes with the primary gear.

[0008] Preferably, the primary gear is fixedly mounted on the output shaft of the second servo motor, and the second servo motor is fixedly mounted on the outside of the mounting housing.

[0009] Preferably, the mounting shell is fixedly connected to the outside of the second side shell by bolts, the double tooth assembly is rotatably mounted in the middle position between the second side shell and the mounting shell, and the end cap is fixedly connected to the end of the first side shell.

[0010] Preferably, a sleeve is fixedly connected to the outside of the flow channel, a central shaft is rotatably connected inside the sleeve, and discs are fixedly connected to both sides of the outer ring surface of the central shaft. A pipe is fixedly connected to the other end of the sleeve.

[0011] Preferably, a rubber ring is fixedly connected to the outer edge of the disk, the rubber ring is interference-fitted with the inner wall of the sleeve, and a first servo motor is drivenly connected to one end of the central shaft, the first servo motor being fixedly installed on the outer side of the sleeve.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, the centrifugal force generated by the rotation of the fan wheel creates a negative pressure state inside the shell. Outside air enters the air inlet through the filtration device and flows outward from the middle of the fan wheel, thus entering the flow channel. The flow channel is arc-shaped and its inner diameter gradually changes. Near the outlet, the inner diameter gradually becomes constant. With the air volume remaining constant, the air speed is faster when the air first enters the smaller inner diameter of the flow channel. As it approaches the outlet, the air speed gradually slows down and becomes constant. The air then enters the main body of the coal mill through the open channel mechanism. Both ends proceed simultaneously, thereby maintaining the sealed cavity of the main body of the coal mill in a stable pressure state and reducing the overflow of coal powder.

[0014] 2. In this utility model, the central shaft is driven to rotate by the first servo motor. In the initial state, the two sets of discs are in a horizontal state. After the central shaft rotates, it drives the two sets of discs to rotate at a certain angle, thereby controlling the amount of air entering the main body of the coal mill. When the discs rotate to a vertical state, the rubber ring abuts against the inner wall of the sleeve to prevent air from entering and improve the sealing effect. Attached Figure Description

[0015] Figure 1 This utility model provides a three-dimensional structural diagram of a double-inlet double-outlet coal mill sealing air system;

[0016] Figure 2 This utility model provides a first three-dimensional structural diagram of a pressure stabilizing mechanism in a double-inlet double-outlet coal mill sealing air system;

[0017] Figure 3 This utility model provides a second three-dimensional structural diagram of a pressure stabilizing mechanism in a double-inlet double-outlet coal mill sealing air system;

[0018] Figure 4 This invention presents a three-dimensional structural diagram of the channel mechanism in a double-inlet, double-outlet coal mill sealing air system.

[0019] Legend: 1. Main body of coal mill; 2. Channel mechanism; 21. Pipe; 22. Sleeve; 23. Rubber ring; 24. Disc; 25. First servo motor; 26. Central shaft; 3. Pressure stabilizing mechanism; 31. End cover; 32. First side shell; 33. Air inlet; 34. Fan wheel; 35. Second side shell; 36. Flow channel; 37. Gear set; 371. First-stage gear; 372. Double gear set; 373. Second-stage gear; 38. Mounting shell; 39. Second servo motor; 4. Filtration equipment. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1: As Figure 1 - Figure 4As shown, this utility model provides a double-inlet, double-outlet sealing air system for a coal mill, including a coal mill body 1 and a filter device 4. Channel mechanisms 2 are fixedly connected to the upper parts of both ends of the coal mill body 1, and a pressure stabilizing mechanism 3 is fixedly connected to the other end of the channel mechanisms 2. The pressure stabilizing mechanism 3 is fixedly installed at the end of the coal mill body 1. The pressure stabilizing mechanism 3 includes an end cover 31, a first side shell 32, an air inlet 33, a fan wheel 34, a second side shell 35, a flow groove 36, a gear set 37, a mounting shell 38, and a second servo motor 39. The fan wheel 34 is rotatably installed in the middle of the shell formed by the first side shell 32 and the second side shell 35. A flow groove 36 is opened on the inner edge of the second side shell 35, located at the edge of the fan wheel 34. One end of the fan wheel 34 is connected to... The gear set 37 is connected to the mounting housing 38. The gear set 37 includes a primary gear 371, a double gear set 372, and a secondary gear 373. One end of the fan wheel 34 passes through the middle of the second side housing 35 and is fixedly connected to the secondary gear 373. The secondary gear 373 is meshed with the double gear set 372. The double gear set 372 is meshed with the primary gear 371. The primary gear 371 is fixedly mounted on the output shaft of the second servo motor 39. The second servo motor 39 is fixedly mounted on the outside of the mounting housing 38. The mounting housing 38 is fixedly connected to the outside of the second side housing 35 by bolts. The double gear set 372 is rotatably mounted in the middle position between the second side housing 35 and the mounting housing 38. The end cover 31 is fixedly connected to the end of the first side housing 32.

[0023] The specific settings and functions of this embodiment are described below: When the main body 1 of the coal mill is running, the second servo motor 39 is started synchronously. The second servo motor 39 drives the first-stage gear 371 to rotate, thereby engaging the small gear in the double gear set 372. The large gear in the double gear set 372 engages the second-stage gear 373 to rotate, which in turn drives the fan wheel 34 to rotate inside the housing formed by the first side shell 32 and the second side shell 35. The centrifugal force generated by the rotation of the fan wheel 34 creates a negative pressure state inside the housing, and outside air enters through the filter device 4. Air enters through inlet 33 and flows outward from the middle of fan wheel 34, thus entering flow channel 36. Flow channel 36 is arc-shaped and its inner diameter gradually changes. Near the outlet, the inner diameter gradually becomes constant. When the air volume remains constant, the air speed is faster when the air first enters the flow channel 36 where the inner diameter is smaller. As it approaches the outlet, the air speed gradually slows down and becomes constant. It then enters the coal mill body 1 through the open channel mechanism 2. Both ends are processed simultaneously, thereby maintaining the sealed cavity of the coal mill body 1 in a stable pressure state and reducing the overflow of coal powder.

[0024] Example 2: Figure 1 , Figure 3 and Figure 4As shown, a sleeve 22 is fixedly connected to the outside of the flow channel 36, and a central shaft 26 is rotatably connected inside the sleeve 22. A disc 24 is fixedly connected to both sides of the outer ring surface of the central shaft 26. A pipe 21 is fixedly connected to the other end of the sleeve 22. A rubber ring 23 is fixedly connected to the outer edge of the disc 24. The rubber ring 23 is interference-fitted with the inner wall of the sleeve 22. A first servo motor 25 is driven to one end of the central shaft 26. The first servo motor 25 is fixedly installed on the outside of the sleeve 22.

[0025] The overall effect of this embodiment is that the first servo motor 25 is started and the first servo motor 25 drives the central shaft 26 to rotate. In the initial state, the two sets of discs 24 are in a horizontal state. After the central shaft 26 rotates, it drives the two sets of discs 24 to rotate at a certain angle, thereby controlling the amount of air entering the main body 1 of the coal mill. When the discs 24 rotate to a vertical state, the rubber ring 23 abuts against the inner wall of the sleeve 22 to prevent air from entering and improve the sealing effect.

[0026] The operating method and working principle of this device: The pipes of the channel mechanism 2 and the pressure stabilizing mechanism 3 are welded together. The pipe 21 extends from the end of the coal mill body 1 to the inside, and the connection is welded and sealed. When the coal mill body 1 is running, the second servo motor 39 is started synchronously. The second servo motor 39 drives the first-stage gear 371 to rotate, thereby meshing with the small gear in the double gear set 372. The large gear in the double gear set 372 meshes with the second-stage gear 373 to rotate, thereby driving the fan wheel 34 to rotate inside the housing composed of the first side shell 32 and the second side shell 35. The centrifugal force generated by the rotation of the fan wheel 34 creates a negative pressure state inside the housing. Outside air enters the air inlet 33 through the filter device 4 and flows outward from the middle of the fan wheel 34, thereby entering the flow groove 36. The flow groove 36 is arc-shaped and the inner diameter gradually changes. Near the outlet, the inner diameter gradually becomes constant. With the air volume remaining constant, the air velocity is relatively high when the air first enters the smaller inner diameter of the flow channel 36. As it approaches the outlet, the air velocity gradually slows down and becomes constant. It enters the coal mill body 1 through the open channel mechanism 2. Both ends proceed synchronously, thereby maintaining a stable pressure in the sealed cavity of the coal mill body 1 and reducing the overflow of coal powder. According to actual needs, the first servo motor 25 is started. The first servo motor 25 drives the central shaft 26 to rotate. In the initial state, the two sets of discs 24 are in a horizontal state. After the central shaft 26 rotates, it drives the two sets of discs 24 to rotate at a certain angle, thereby controlling the amount of air entering the coal mill body 1. When the discs 24 rotate to a vertical state, the rubber ring 23 abuts against the inner wall of the sleeve 22 to prevent air from entering.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A double-inlet, double-outlet sealing air system for a coal mill, comprising a coal mill body (1) and a filter device (4), characterized in that: The upper part of both ends of the main body (1) of the coal mill is fixedly connected to a channel mechanism (2), and the other end of the channel mechanism (2) is fixedly connected to a pressure stabilizing mechanism (3). The pressure stabilizing mechanism (3) is fixedly installed at the end of the main body (1) of the coal mill. The pressure stabilizing mechanism (3) includes an end cover (31), a first side shell (32), an air inlet (33), a fan wheel (34), a second side shell (35), a flow groove (36), a gear set (37), a mounting shell (38), and a second servo motor (39). The fan wheel (34) is rotatably installed in the middle of the shell formed by the first side shell (32) and the second side shell (35). A flow groove (36) is opened on the inner edge of the second side shell (35). The flow groove (36) is located at the edge of the fan wheel (34). One end of the fan wheel (34) is connected to the gear set (37) in a transmission connection. The gear set (37) is connected to the mounting shell (38) in a transmission connection.

2. The sealing air system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The gear set (37) includes a primary gear (371), a double gear set (372) and a secondary gear (373). One end of the fan wheel (34) passes through the middle of the second side shell (35) and is fixedly connected to the secondary gear (373).

3. The sealing air system for a double-inlet, double-outlet coal mill according to claim 2, characterized in that: The secondary gear (373) meshes with the double tooth set (372), and the double tooth set (372) meshes with the primary gear (371).

4. The sealing air system for a double-inlet, double-outlet coal mill according to claim 3, characterized in that: The primary gear (371) is fixedly mounted on the output shaft of the second servo motor (39), and the second servo motor (39) is fixedly mounted on the outside of the mounting housing (38).

5. A sealing air system for a double-inlet, double-outlet coal mill according to claim 4, characterized in that: The mounting shell (38) is fixedly connected to the outside of the second side shell (35) by bolts. The double tooth assembly (372) is rotatably installed in the middle position between the second side shell (35) and the mounting shell (38). The end cap (31) is fixedly connected to the end of the first side shell (32).

6. The sealing air system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The outer side of the flow channel (36) is fixedly connected to a sleeve (22), and the inner side of the sleeve (22) is rotatably connected to a central shaft (26). Both sides of the outer ring surface of the central shaft (26) are fixedly connected to a disc (24), and the other end of the sleeve (22) is fixedly connected to a pipe (21).

7. A sealing air system for a double-inlet, double-outlet coal mill according to claim 6, characterized in that: A rubber ring (23) is fixedly connected to the outer edge of the disc (24). The rubber ring (23) is interference-fitted with the inner wall of the sleeve (22). One end of the central shaft (26) is connected to a first servo motor (25). The first servo motor (25) is fixedly installed on the outside of the sleeve (22).

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