Movable air ring device of coal mill

Abstract

The utility model provides a coal mill movable air ring device which comprises an air ring inner ring and an air ring outer ring arranged on the peripheral side of the air ring inner ring in a sleeved mode, and the first end of the air ring inner ring and the first end of the air ring outer ring are arranged in a staggered mode in the axial direction of the coal mill movable air ring device. The movable air ring device comprises an air ring inner ring and an air ring outer ring, the axial distance between the air ring inner ring and the first end of the air ring outer ring is 0-30 mm, the movable air ring device of the coal mill further comprises blades, the blades extend in the axial direction of the movable air ring device of the coal mill, and the extension length of the blades is larger than the extension length of the air ring inner ring or the air ring outer ring. The first end of the air ring inner ring and the first end of the air ring outer ring are arranged in the axial direction in a staggered mode to form the annular air channel, airflow can enter all positions of the air ring inner ring and the air ring outer ring through the annular air channel, and therefore the air inflow and the aerodynamic performance are improved. The extension length of the blades is larger than that of the air ring inner ring and the air ring outer ring, the speed of air passing through the blades is higher, and the air guiding effect is better.

Description

Technical Field

[0001] This utility model specifically relates to a motorized air ring device for coal milling. Background Technology

[0002] The impeller, also known as the air ring, is a crucial component of a coal mill system and is typically installed on the grinding bowl inside the mill. In existing technology, the inner and outer rings of the impeller are flush. However, in practical use, it has been found that this flush configuration results in poor aerodynamic performance, and the airflow velocity cannot meet the operational requirements of the coal mill. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defect of poor aerodynamic performance of the existing dynamic air ring and to provide a coal mill dynamic air ring device.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A coal mill motorized air ring device includes an inner air ring and an outer air ring sleeved on the outer periphery of the inner air ring. The first ends of the inner air ring and the outer air ring are offset along the axial direction of the coal mill motorized air ring device, and the axial distance between the first ends of the inner air ring and the outer air ring is 0-30mm. The coal mill motorized air ring device also includes blades that extend along the axial direction of the coal mill motorized air ring device, and the extension length of the blades is greater than the extension length of the inner air ring or the outer air ring.

[0006] In this design, by axially offsetting the first ends of the inner and outer rings of the air ring, an annular air duct is formed. Airflow can enter various positions within both the inner and outer rings through this annular air duct, thereby improving air intake and aerodynamic performance. Furthermore, the blades positioned between the inner and outer rings have a longer extension length than the inner and outer rings themselves. Compared to blades with an extension length equal to or less than the inner and outer rings, this results in faster wind speeds and better airflow guidance.

[0007] Preferably, the blade includes a first blade and a second blade, wherein a first end of the first blade extends from a first end of the inner ring of the wind ring to a first end of the outer ring of the wind ring.

[0008] In this design, the aerodynamic performance is better than that of the first end of the first piece that does not extend to the outer ring of the wind ring, thanks to the above-mentioned configuration.

[0009] Preferably, the first end face of the first piece forms an angle of ±15° with the radial direction of the coal mill motorized air ring device.

[0010] In this scheme, the above-mentioned arrangement forms an inclined surface at the first end of the first piece, thereby guiding the gas flow and accelerating the gas flow rate.

[0011] Preferably, the second piece forms an angle of 40-55° with the axial direction of the coal mill motorized air ring device.

[0012] In this scheme, the above-mentioned arrangement allows the gas to flow out through the inclined second piece after it enters the area between the inner and outer rings of the air ring, thereby improving the air intake efficiency of the coal mill motorized air ring device.

[0013] Preferably, the blades extend radially along the coal mill motorized air ring device, and the blades extend from the inner ring of the air ring to the outer ring of the air ring.

[0014] In this scheme, the above-mentioned settings ensure that the blades extend from the inner ring of the wind ring to the outer ring, thus preventing turbulence between the inner and outer rings of the wind ring caused by some blades not extending to the outer ring.

[0015] Preferably, along the axial direction of the coal mill motorized air ring device, the length of the first plate is L1, the length of the second plate is L2, L2:L1=t, where the value of t is in the range of 1<t<150.

[0016] In this solution, the aerodynamic performance of the coal mill motorized air ring device is ensured by limiting the extension length of the first and second plates through the above-mentioned settings.

[0017] Preferably, when the length L1 of the first sheet is in the range of 20-60mm, the coal mill motorized air ring device is used for lignite; when the length L1 of the first sheet is in the range of 40-80mm, the coal mill motorized air ring device is used for bituminous coal; and when the length L1 of the first sheet is in the range of 70-110mm, the coal mill motorized air ring device is used for coal.

[0018] In this scheme, the above settings are used to adjust the length of the first sheet for different types of coal, ensuring aerodynamic performance when applicable to different types of coal.

[0019] Preferably, along the radial direction of the coal mill motorized air ring device, the outer ring of the air ring is spaced apart from the housing of the coal mill motorized air ring device, and the spacing is 6-15mm.

[0020] In this scheme, the above settings are used to ensure the heat dissipation effect of the coal mill motorized fan ring device.

[0021] Preferably, the coal mill motorized air ring device further includes a pressure plate, which is disposed at the first end of the inner ring of the air ring, and the pressure plate is provided with a plurality of mounting holes.

[0022] In this solution, the above-mentioned settings are used to increase the contact area of ​​the inner ring of the wind ring, thereby protecting the first end of the inner ring of the wind ring and preventing it from being damaged or deformed.

[0023] Preferably, the coal mill motorized air ring device further includes a protective ring, and multiple protective rings are provided, which are disposed on the pressure plate and correspond one-to-one with the mounting holes.

[0024] In this solution, the above-mentioned settings are used to further enhance the protection effect on the inner ring of the wind ring.

[0025] The significant advantages of this invention are as follows: By axially offsetting the first ends of the inner and outer rings of the air ring, an annular air duct is formed. Airflow can enter various positions within both the inner and outer rings through this annular air duct, thereby improving air intake and aerodynamic performance. Furthermore, the blades positioned between the inner and outer rings have a longer extension length than the inner and outer rings themselves. Compared to blades with an extension length equal to or less than the inner and outer rings, this results in faster airflow and better air guiding. Attached Figure Description

[0026] Figure 1 This is a perspective view of a preferred embodiment of the coal mill motorized air ring device of this utility model.

[0027] Figure 2 This is a schematic diagram of the structure of a preferred embodiment of the coal mill motorized air ring device.

[0028] Figure 3 This diagram shows the positional relationship between the first piece and the second piece in a preferred embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] Wind ring inner circle 1

[0031] Wind ring outer ring 2

[0032] First end 3

[0033] Leaf 4

[0034] First piece 41

[0035] Second piece 42

[0036] Pressure plate 5

[0037] Protective ring 6

[0038] Axial direction A

[0039] Radial direction B Detailed Implementation

[0040] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0041] This embodiment provides a coal mill motorized air ring device, the specific structure of which is as follows: Figure 1 and Figure 2 As shown, the coal mill motorized air ring device includes an inner air ring 1 and an outer air ring 2 sleeved on the outer periphery of the inner air ring 1. The first ends of the inner air ring 1 and the outer air ring 2 are offset along the axial direction A of the coal mill motorized air ring device, and the axial distance between the first ends 3 of the inner air ring 1 and the outer air ring 2 is 0-30mm. The coal mill motorized air ring device also includes blades 4, which extend along the axial direction A of the coal mill motorized air ring device, and the extension length of the blades 4 is greater than the extension length of the inner air ring 1 or the outer air ring 2.

[0042] Specifically, the outer ring 2 of the air ring is fitted around the outer periphery of the inner ring 1 of the air ring, and the two are spaced apart to form an annular gap, within which blades 4 are installed. The first end 3 of the inner ring 1 and the first end 3 of the outer ring 2 are offset along the axial direction A of the coal mill motorized air ring device. That is, the first end 3 of the inner ring 1 and the first end 3 of the outer ring 2 are located on different planes in the radial direction B of the coal mill motorized air ring device. This means that the first end 3 of the inner ring 1 and the first end 3 of the outer ring 2 form a stepped height difference structure along the axial direction A. This stepped height difference structure has an annular airflow field in the circumferential direction, allowing airflow to enter various positions of the inner ring 1 and the outer ring 2 through the annular airflow channel, thereby improving the intake volume and aerodynamic performance.

[0043] Furthermore, the blades 4 arranged between the inner ring 12 and the outer ring of the air ring have a longer extension length than the inner ring 1 and the outer ring 2 of the air ring. Compared to blades 4 having an extension length that is the same as or less than the extension length of the inner ring 1 and the outer ring 2 of the air ring, the longer blades 4 have a better guiding effect on the airflow entering between the inner ring 1 and the outer ring 2 of the air ring, and the wind speed passing through the blades 4 is faster, thus making the air guiding effect of the coal mill motorized air ring device better.

[0044] In this embodiment, the blade 4 is made of carbon steel material in the prior art. In other embodiments, the blade 4 can also be made of welded steel plate with wear-resistant alloy layer in the prior art, or the blade 4 can be made entirely of wear-resistant steel plate, which can also ensure the structural strength of the blade 4. This is the prior art and will not be described in detail here.

[0045] In this embodiment, the blade 4 includes a first blade 41 and a second blade 42. The first end of the first blade 41 extends from the first end 3 of the inner ring 1 of the wind ring to the first end 3 of the outer ring 2 of the wind ring.

[0046] Specifically, the first piece 41 and the second piece 42 are integrally formed. The first piece 41 is positioned facing the first end 3 of the inner ring 1 and the outer ring 2 of the wind ring, while the second piece 42 is positioned away from the first end 3 of the inner ring 1 and the outer ring 2 of the wind ring. The first end of the first piece 41 extends from the first end 3 of the inner ring 1 to the first end 3 of the outer ring 2 of the wind ring. Based on the stepped height difference structure formed by the inner ring 1 and the outer ring 2 of the wind ring, the first end of the first piece 41 serves as a transition structure for the airflow between the inner ring 1 and the outer ring 2 of the wind ring. Compared to a structure where the first end of the first piece 41 does not extend to the first end 3 of the outer ring 2, its transition directly reaches the first end 3 of the outer ring 2 of the wind ring, resulting in smoother airflow and better aerodynamic performance.

[0047] In this embodiment, the first end face of the first piece 41 forms an angle of ±15° with the radial direction B of the coal mill motorized air ring device.

[0048] Specifically, the first end face of the first piece 41 extends from the first end 3 of the inner ring 1 to the first end 3 of the outer ring 2, forming a stepped height difference structure between the inner ring 1 and the outer ring 2. The first end face of the first piece 41 is a slope, which accelerates the gas flow rate. Compared with other shaped surfaces, the slope facilitates airflow transition and guidance, making the gas entering from the inner ring 1 and the outer ring 2 of the air ring flow more smoothly.

[0049] like Figure 3 As shown, in this embodiment, the second piece 42 forms an angle of 40-55° with the axial direction A of the coal mill motorized air ring device.

[0050] Specifically, the first piece 41 has a flat plate cross-section, and the second piece 42 has an inclined plate cross-section that is inclined to the axial direction A. The connection between the first piece 41 and the second piece 42 is a smooth transition through an arc. Along the axial direction A, the first piece 41 is arranged parallel to the axial direction A, while the second piece 42 forms an angle of 40-55° with the axial direction A. This allows the gas to be guided by the inclined second piece 42 after it enters the area between the inner ring 1 and the outer ring 2 of the air ring, facilitating gas outflow and thus improving the air intake efficiency of the coal mill motorized air ring device.

[0051] In this embodiment, the blade 4 extends along the radial direction B of the coal mill motor air ring device, and the blade 4 extends from the inner ring 1 of the air ring to the outer ring 2 of the air ring.

[0052] Specifically, the blade 4 includes a first blade 41 and a second blade 42. The blade 4 extends from the inner ring 1 of the air ring to the outer ring 2 of the air ring, meaning that the width of the blade 4 is the same as the gap between the inner ring 1 and the outer ring 2. Compared to only the first blade 41 extending from the inner ring 1 to the outer ring 2, while the second blade 42 does not extend from the inner ring 1 to the outer ring 2, this avoids the situation where local blades 4 in the gap between the inner ring 1 and the outer ring 2, such as the second blade 42 not extending to the outer ring 2, cause turbulence in the gas between the inner ring 1 and the outer ring 2, thereby ensuring the aerodynamic performance of the coal mill motorized air ring device.

[0053] In this embodiment, along the axial direction A of the coal mill motorized air ring device, the length of the first piece 41 is L1, the length of the second piece 42 is L2, L2:L1=t, where the value of t is in the range of 1<t<150.

[0054] Specifically, t is a length coefficient, and the value of the length coefficient t is 1 < t < 150. That is to say, the extension length of the second piece 42 is greater than the extension length of the first piece 41. By limiting the extension length of the first piece 41 and the second piece 42, the aerodynamic performance of the coal mill motorized air ring device is guaranteed.

[0055] Furthermore, in this embodiment, when the length L1 of the first sheet 41 is in the range of 20-60 mm, the coal mill motorized air ring device is used for lignite; when the length L1 of the first sheet 41 is in the range of 40-80 mm, the coal mill motorized air ring device is used for bituminous coal; and when the length L1 of the first sheet 41 is in the range of 70-110 mm, the coal mill motorized air ring device is used for coal-bearing coal. It is understood that the Hardgrove Grindability Index (HGI) of the above-mentioned coal types is ≥45, and the total moisture content (Mt) is ≤38%. The length of the first sheet 41 is set for different coal types to ensure aerodynamic performance applicable to different coal types.

[0056] In this embodiment, along the radial direction B of the coal mill motorized air ring device, the outer ring 2 of the air ring is spaced apart from the housing (not shown in the figure) of the coal mill motorized air ring device, with a spacing of 6-15mm. By spaced apart from the housing and the outer ring 2 of the air ring, the heat dissipation effect of the coal mill motorized air ring device is ensured.

[0057] In this embodiment, the coal mill motorized air ring device further includes a pressure plate 5, which is disposed at the first end 3 of the inner ring 1 of the air ring. The pressure plate 5 has multiple mounting holes (not shown in the figure). The pressure plate 5 is an annular plate that extends radially in the direction B and is perpendicular to the first end 3 of the inner ring 1 of the air ring. By setting the pressure plate 5, the contact area of ​​the inner ring 1 of the air ring is increased, thereby protecting the first end 3 of the inner ring 1 of the air ring and preventing it from being damaged or deformed.

[0058] In this embodiment, the coal mill motorized air ring device also includes a protective ring 6. Multiple protective rings are provided, and the multiple protective rings are provided on the pressure plate 5 and are provided one-to-one with the mounting holes.

[0059] Specifically, the protective ring 6 has a cylindrical structure, extends along the axial direction A, covers the mounting hole, and is perpendicular to the pressure plate 5. By setting the protective ring 6, when the pressure plate 5 is compressed, the protective ring 6 is subjected to force before the pressure plate 5, thereby further improving the protection effect on the inner ring 1 of the air ring.

[0060] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A coal mill motorized air ring device, the coal mill motorized air ring device comprising an inner air ring and an outer air ring sleeved on the outer periphery of the inner air ring, characterized in that, The inner ring of the air ring and the first end of the outer ring of the air ring are offset along the axial direction of the coal mill motorized air ring device, and the axial distance between the first ends of the inner ring of the air ring and the outer ring of the air ring is 0-30mm. The coal mill motorized air ring device also includes blades, which extend along the axial direction of the coal mill motorized air ring device, and the extension length of the blades is greater than the extension length of the inner ring or the outer ring of the air ring.

2. The coal mill motorized air ring device as described in claim 1, characterized in that, The blade includes a first blade and a second blade, wherein a first end of the first blade extends from a first end of the inner ring of the wind ring to a first end of the outer ring of the wind ring.

3. The coal mill motorized air ring device as described in claim 2, characterized in that, The first end face of the first piece forms an angle of ±15° with the radial direction of the coal mill motorized air ring device.

4. The coal mill motorized air ring device as described in claim 3, characterized in that, The second piece forms an angle of 40-55° with the axial direction of the coal mill motorized air ring device.

5. The coal mill motorized air ring device as described in claim 1, characterized in that, The blades extend radially along the coal mill motorized air ring device, and extend from the inner ring of the air ring to the outer ring of the air ring.

6. The coal mill motorized air ring device as described in claim 2, characterized in that, Along the axial direction of the coal mill motorized air ring device, the length of the first plate is L1, the length of the second plate is L2, L2:L1=t, where the value of t is in the range of 1<t<150.

7. The coal mill motorized air ring device as described in claim 6, characterized in that, When the length L1 of the first sheet is in the range of 20-60mm, the coal mill motorized air ring device is used for lignite; when the length L1 of the first sheet is in the range of 40-80mm, the coal mill motorized air ring device is used for bituminous coal; and when the length L1 of the first sheet is in the range of 70-110mm, the coal mill motorized air ring device is used for coal.

8. The coal mill motorized air ring device as described in claim 1, characterized in that, Along the radial direction of the coal mill motorized air ring device, the outer ring of the air ring is spaced apart from the housing of the coal mill motorized air ring device, with a spacing of 6-15mm.

9. The coal mill motorized air ring device as described in claim 1, characterized in that, The coal mill motorized air ring device also includes a pressure plate, which is disposed at the first end of the inner ring of the air ring, and the pressure plate is provided with multiple mounting holes.

10. The coal mill motorized air ring device as described in claim 9, characterized in that, The coal mill motorized air ring device also includes a protective ring, and multiple protective rings are provided, which are disposed on the pressure plate and correspond one-to-one with the mounting holes.

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