Sealing air interlocking device of coal mill
By designing the sealed air chain device of the coal mill, the combination of the air speed measuring instrument and the cold primary air mother pipe is used to solve the problem of sealed air return, and the service life of the sealed air fan is improved through protective parts to ensure the normal operation of the coal mill and Improvement of coal mine production efficiency.
Patent Information
- Application Number
- CN202420821797.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-02-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing sealed fans of coal mills lack protection functions and are susceptible to collisions and cause failures, affecting their service life, and causing the coal mills to lose their sealed air and cannot operate normally, affecting the production efficiency of coal mines.
A coal grinder sealed air chain device is designed, including a sealed fan, a chain assembly and a protective member. The chain assembly monitors the wind speed through the air speed measuring instrument. When the sealing fan fails, the cold primary air mother pipe blows out the cold primary air, forming a 3KPa pressure difference to avoid the sealing air return; the protective parts pass through the damper and spring structure to reduce the sealing fan's exposure. Impact force improves its service life.
It effectively avoids the return of sealed air, ensures the continuous circulation of sealed air inside the coal mill, prevents the coal mill from being unable to operate due to loss of sealed air, and extends the service life of the sealed air.
Smart Images
Figure CN222446802U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal power generation, in particular to a coal mill sealing air interlocking device. Background Art
[0002] In thermal power plants, the sealed air system of coal mills of large units generally includes: primary fans, sealed fans and coal mills. Medium-speed coal mills are widely used in the pulverizing system of the power industry due to their small footprint, low power consumption, high reliability, easy maintenance, and wide adaptability to coal types. During operation, the primary fan pressurizes part of the primary air through the sealed fan to form sealed air, which is discharged to the coal mill to seal the sealing points of the coal mill; the other part is discharged to the coal mill through the cold primary air outlet and the hot primary air outlet to realize the transportation of coal powder in the coal mill. For medium-speed coal mills, the sealed air mainly seals the roller bearings, tie rods, carbon sealing rings and other parts to prevent dust and coal powder in the hot primary air from leaking from the sealing rings and polluting the surrounding environment of the equipment, and to prevent the leaked coal powder from entering the main reducer, lubricating oil and hydraulic oil system through the air vents of the reducer and hydraulic station to pollute the lubricating oil and hydraulic oil.
[0003] During the use of the existing coal mill, the sealing air is provided by the sealed fan. Since the sealed fan does not have a protective function, the sealed fan is easily hit and malfunctions and cannot operate normally, affecting the service life of the sealed fan. At the same time, a malfunction of the sealed fan will cause the coal mill to lose sealing air, resulting in the coal mill losing protection and being unable to operate normally, affecting the production efficiency of the coal mine.
[0004] Therefore, it is necessary to provide a new coal mill sealing air interlocking device to solve the above technical problems. Utility Model Content
[0005] The utility model aims to provide a coal mill sealing air interlocking device to solve the problems raised in the above background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill sealed air interlocking device, comprising a base plate, and also comprising: a support frame arranged on the top of the base plate, a coal mill body being arranged on the top of the support frame; a sealed fan arranged on the top of the base plate, a interlocking assembly being arranged at one end of the sealed fan, a protective member being arranged on the outside of the sealed fan, the interlocking assembly comprising a sealed mother pipe arranged at the air outlet of the sealed fan, a cold primary air mother pipe being arranged on the outside of the sealed mother pipe, and a monitoring member being arranged inside the sealed mother pipe.
[0007] Preferably, the monitoring device includes a wind speed measuring instrument arranged inside the sealed mother pipe.
[0008] Preferably, the monitoring component also includes a first solenoid valve arranged on the outside of the sealing mother pipe, and a second solenoid valve arranged on the outside of the cold primary air mother pipe.
[0009] Preferably, the protective member includes a mounting plate and a damper fixed to one side of the mounting plate.
[0010] Preferably, the protective member further includes a protective plate fixed to one end of the damper, and a support rod fixed to one side of the mounting plate.
[0011] Preferably, the protective member further includes a guide rod sliding inside the support rod, and a limit block fixed to one end of the guide rod.
[0012] Preferably, the protective member further includes a limiting rod fixed to the inner wall of the support rod, and a spring arranged on the outer side of the limiting rod.
[0013] Preferably, a mounting frame is provided on the outer side of the sealed fan, and mounting bolts are provided inside the mounting frame.
[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0015] When the sealed air blower fails, the wind speed measuring instrument controls the first solenoid valve to close to avoid the sealing air backflow inside the sealed mother pipe, and opens the second solenoid valve at the same time, so that the cold primary air mother pipe blows out the cold primary air. The pressure difference between the cold primary air and the sealed air reaches 3KPa, so that the sealing air backflow is avoided, and the sealed air continues to circulate inside the coal mill body, so that the coal mill body cannot operate due to the loss of the sealing air. The sealing air blower is protected by arranging protective parts to increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A structural schematic diagram of a preferred embodiment of a coal mill sealing air interlocking device provided by the utility model;
[0017] Figure 2 It is a structural schematic diagram of the interlocking assembly in the utility model;
[0018] Figure 3 It is a structural schematic diagram of the protective member in the utility model;
[0019] Figure 4 This is a schematic diagram of the structure inside the support rod of the utility model;
[0020] Figure 5 The utility model is a working principle diagram of the wind speed measuring instrument.
[0021] In the figure: 1. bottom plate; 2. support frame; 3. coal mill body; 4. sealed fan; 5. interlocking assembly; 531. wind speed measuring instrument; 532. first solenoid valve; 533. second solenoid valve; 51. sealed mother pipe; 52. cold primary air mother pipe; 53. monitoring part; 6. protective part; 61. mounting plate; 62. damper; 63. protective plate; 64. support rod; 65. guide rod; 66. limit block; 67. limit rod; 68. spring; 7. mounting frame; 8. mounting bolt. DETAILED DESCRIPTION
[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.
[0023] See also Figure 1-5 As shown, a coal mill sealed air interlocking device includes a base plate 1, and also includes: a support frame 2 arranged on the top of the base plate 1, and a coal mill body 3 is arranged on the top of the support frame 2; a sealed fan 4 is arranged on the top of the base plate 1, and a interlocking component 5 is arranged at one end of the sealed fan 4, and a protective component 6 is arranged on the outside of the sealed fan 4. The interlocking component 5 includes a sealed mother pipe 51 arranged at the air outlet of the sealed fan 4, a cold primary air mother pipe 52 is arranged on the outside of the sealed mother pipe 51, and a monitoring component 53 is arranged inside the sealed mother pipe 51.
[0024] It should be noted that: the coal mill body 3 is supported by the support frame 2, one end of the sealing mother pipe 51 is connected with the outside of the coal mill body 3, providing sealing air to the inside of the coal mill body 3, and one end of the cold primary air mother pipe 52 is connected with the outside of the sealing mother pipe 51. When the sealing fan 4 fails, the cold primary air mother pipe 52 blows out cold primary air, and the pressure difference between the cold primary air and the sealing air reaches 3KPa, which avoids the backflow of sealing air and prevents the coal mill body 3 from being unable to operate due to the loss of sealing air.
[0025] refer to Figure 2 and Figure 5As shown, the monitoring component 53 includes a wind speed measuring instrument 531 arranged inside the sealed mother pipe 51; the monitoring component 53 also includes a first solenoid valve 532 arranged outside the sealed mother pipe 51, and a second solenoid valve 533 arranged outside the cold primary air mother pipe 52; the wind speed measuring instrument 531 is a prior art, which measures the passing wind speed. When the sealed fan 4 operates normally, the wind speed measuring instrument 531 monitors and measures the wind speed to ensure the normal operation of the coal mill body 3. When the sealed fan 4 fails, the wind speed measuring instrument 531 cannot monitor the wind speed. The wind speed measuring instrument 531 controls the first solenoid valve 532 to close to avoid the sealing air backflow inside the sealed mother pipe 51, and opens the second solenoid valve 533 at the same time, and the cold primary air mother pipe 52 blows out the cold primary air. The pressure difference between the cold primary air and the sealing air reaches 3KPa, which avoids the sealing air backflow, so that the sealing air continues to circulate inside the coal mill body 3, and avoids the coal mill body 3 from being unable to operate due to the loss of sealing air.
[0026] refer to Figure 3 and Figure 4 As shown, the protective member 6 includes a mounting plate 61, and a damper 62 fixed to one side of the mounting plate 61; the protective member 6 also includes a protective plate 63 fixed to one end of the damper 62, and a support rod 64 fixed to one side of the mounting plate 61; the protective member 6 also includes a guide rod 65 sliding inside the support rod 64, and a limit block 66 fixed to one end of the guide rod 65; the protective member 6 also includes a limit rod 67 fixed to the inner wall of the support rod 64, and a spring 68 arranged on the outer side of the limit rod 67; a mounting frame 7 is arranged on the outer side of the sealed fan 4, and a mounting bolt is arranged inside the mounting frame 7 8; Install the mounting frame 7 on the top of the base plate 1 by installing the bolts 8, and install the sealed fan 4. The mounting plate 61 is fixed on the outside of the sealed fan 4. When the sealed fan 4 is hit, the protective plate 63 moves, driving the outer side of the guide rod 65 to slide inside the support rod 64, and the inner wall of the guide rod 65 slides on the outer side of the limit rod 67, so that the spring 68 contracts. Through the action of the spring 68 and the damper 62, the guide rod 65 and the protective plate 63 are driven to quickly reset, thereby reducing the impact force on the sealed fan 4, protecting the sealed fan 4, and improving the service life.
[0027] Working principle: When the device is in use, when the sealed fan 4 operates normally, the wind speed measuring instrument 531 monitors and measures the wind speed to ensure the normal operation of the coal mill body 3. When the sealed fan 4 fails, the wind speed measuring instrument 531 cannot monitor the wind speed. The wind speed measuring instrument 531 controls the first electromagnetic valve 532 to close to avoid the sealing air backflow inside the sealed mother pipe 51, and opens the second electromagnetic valve 533 at the same time, and the cold primary air mother pipe 52 blows out the cold primary air. The pressure difference between the cold primary air and the sealing air reaches 3KPa, which avoids the sealing air backflow and makes the sealing The sealing air continues to circulate inside the coal mill body 3 to prevent the coal mill body 3 from being unable to operate due to the loss of sealing air. When the sealing fan 4 is hit, the protective plate 63 moves, driving the outer side of the guide rod 65 to slide inside the support rod 64, and the inner wall of the guide rod 65 slides on the outer side of the limit rod 67, so that the spring 68 contracts. Through the action of the spring 68 and the damper 62, the guide rod 65 and the protective plate 63 are driven to quickly reset, thereby reducing the impact force on the sealing fan 4, protecting the sealing fan 4, and increasing the service life.
[0028] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A coal mill sealing air interlocking device, comprising a bottom plate (1), characterized in that: Also includes: A support frame (2) is arranged on the top of the bottom plate (1), and a coal mill body (3) is arranged on the top of the support frame (2); A sealed fan (4) is arranged on the top of the base plate (1), a locking assembly (5) is arranged at one end of the sealed fan (4), a protective component (6) is arranged on the outer side of the sealed fan (4), the locking assembly (5) comprises a sealed main pipe (51) arranged at the air outlet of the sealed fan (4), a cold primary air main pipe (52) is arranged on the outer side of the sealed main pipe (51), and a monitoring component (53) is arranged inside the sealed main pipe (51).
2. A coal mill sealing air interlocking device according to claim 1, characterized in that: The monitoring component (53) comprises a wind speed measuring instrument (531) arranged inside the sealed mother pipe (51).
3. A coal mill sealing air interlocking device according to claim 2, characterized in that: The monitoring component (53) further comprises a first solenoid valve (532) arranged on the outside of the sealing mother pipe (51), and a second solenoid valve (533) arranged on the outside of the cold primary air mother pipe (52).
4. A coal mill sealing air interlocking device according to claim 1, characterized in that: The protective member (6) comprises a mounting plate (61) and a damper (62) fixed to one side of the mounting plate (61).
5. A coal mill sealing air interlocking device according to claim 4, characterized in that: The protective member (6) further comprises a protective plate (63) fixed to one end of the damper (62), and a support rod (64) fixed to one side of the mounting plate (61).
6. A coal mill sealing air interlocking device according to claim 5, characterized in that: The protective member (6) further comprises a guide rod (65) sliding inside the support rod (64), and a limit block (66) fixed to one end of the guide rod (65).
7. A coal mill sealing air interlocking device according to claim 6, characterized in that: The protective member (6) further comprises a limiting rod (67) fixed to the inner wall of the support rod (64), and a spring (68) arranged on the outer side of the limiting rod (67).
8. A coal mill sealing air interlocking device according to claim 1, characterized in that: A mounting frame (7) is arranged on the outside of the sealed fan (4), and mounting bolts (8) are arranged inside the mounting frame (7).