CN214439613U - Impeller nozzle mechanism and coal mill comprising same - Google Patents

Abstract

The utility model discloses an impeller nozzle mechanism and contain coal pulverizer of this impeller nozzle, impeller nozzle mechanism includes grinding bowl and separator welt, and the clearance between grinding bowl and the separator welt constitutes the ventilation nozzle, is equipped with the impeller subassembly between grinding bowl and the separator welt, is equipped with grinding bowl extension ring on the grinding bowl, and the impeller subassembly includes impeller inner circle board, locates the impeller outer circle board outside the impeller inner circle board, evenly locates a plurality of deflector between impeller inner circle board and the impeller outer circle board, and impeller inner circle board and grinding bowl extension ring fixed connection; the guide plate comprises a first plate body and a second plate body, one end of the first plate body is fixedly connected with one end of the second plate body, the first plate body is horizontally arranged along the radial direction of the inner ring plate of the impeller, and the second plate body is obliquely arranged along the radial direction of the inner ring plate of the impeller. The utility model provides an impeller nozzle mechanism has effectively avoided the great slag charge of proportion to be blown off by the hot-air, the easy problem that brings the slag charge into the deslagging box of coal, has improved the ejection of compact quality and the life of coal pulverizer.

Description

Impeller nozzle mechanism and coal mill comprising same

Technical Field

The utility model relates to a coal pulverizer technical field, concretely relates to impeller nozzle mechanism and contain this impeller nozzle mechanism's coal pulverizer.

Background

The coal mill is widely applied to the industries of cement, electric power, metallurgy, chemical industry, non-metal ores and the like. When the existing coal mill works, a motor drives a grinding bowl to rotate through a speed reducer, raw coal falls in the center of a grinding disc through a coal falling pipe in the center of the coal mill, meanwhile, hot air enters the grinding disc from an air inlet, the raw coal moves towards the edge of the grinding disc under the action of centrifugal force and is ground by rolling of a grinding roller when passing through an annular groove in the grinding disc, the ground material is brought up by high-speed airflow of an air ring at the edge of the grinding disc, qualified fine powder enters a separator along with the airflow for further separation, and slag with large specific gravity falls into a slag discharge box.

The structure of an impeller nozzle mechanism in the existing coal mill is shown in fig. 1 and fig. 2, and comprises a grinding bowl 1, a grinding bowl extension ring 3, a separator lining plate 2, an air throttle ring 13, an adjusting ring 10, an impeller inner ring plate 4, an impeller outer ring plate 5, and a plurality of guide plates 6 uniformly arranged between the impeller inner ring plate 4 and the impeller outer ring plate 5, wherein an air channel is formed between the adjacent guide plates 6, the outer edge of the grinding bowl extension ring 3 is fixedly connected with the impeller inner ring plate, the guide plates in the prior art are arranged along the radial direction of the impeller inner ring plate in an inclined manner, when the coal mill works, the grinding bowl drives the grinding bowl extension ring, the impeller inner ring plate, the impeller outer ring plate and the guide plates to rotate together, coal on the grinding bowl is thrown out of the grinding bowl under the action of centrifugal force, pulverized coal powder is brought into the separator by hot air entering from a tangential air inlet at the lower part of the coal mill for further separation, the slag with larger specific gravity falls into a slag discharging box. The impeller nozzle mechanism in the prior art mainly has the following problems: 1. when the quality of raw coal is poor or grinding and crushing are insufficient, the content of coarse particles in the material brought out by hot air is high, and coal is easy to fall into a slag discharging box along with slag with high specific gravity; 2. the slag materials thrown out and falling into the slag discharging box comprise stones, metal blocks, a small amount of coal particles and the like which are entrained in raw coal and are collectively called as pebble coal, the pebble coal can be thrown out under the centrifugal force action of the grinding bowl, and the pebble coal easily causes damage or falling of a lining plate of the separator in the throwing-out process, needs to be frequently replaced, and directly reduces the working efficiency and the service life of the coal mill.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects and providing an impeller nozzle mechanism, which can lead the thrown material to be quickly decelerated and separated after shaping through a first plate body horizontally arranged along the radial direction of an impeller inner ring plate, effectively avoids the problems that the slag material with larger specific gravity is blown out by hot air and coal is easily brought into a slag discharging box by the slag material, improves the discharging quality and the service life of a coal mill and reduces the use energy consumption of the coal mill; furthermore, the utility model also provides a coal pulverizer.

In order to achieve the above object, the utility model provides an impeller nozzle mechanism in a first aspect, which comprises a grinding bowl and a separator lining plate, wherein a gap between the grinding bowl and the separator lining plate forms a ventilation nozzle, an impeller assembly is arranged between the grinding bowl and the separator lining plate, a grinding bowl extension ring is arranged on the grinding bowl, the impeller assembly comprises an impeller inner ring plate, an impeller outer ring plate arranged outside the impeller inner ring plate, and a plurality of guide plates uniformly arranged between the impeller inner ring plate and the impeller outer ring plate, and the impeller inner ring plate is fixedly connected with the grinding bowl extension ring; the guide plate comprises a first plate body and a second plate body, one end of the first plate body is fixedly connected with one end of the second plate body, the lower end face of the first plate body is an obtuse angle with an included angle between the lower end faces of the second plate body, the first plate body is arranged along the radial horizontal direction of the impeller inner ring plate, and the second plate body is arranged along the radial inclined direction of the impeller inner ring plate.

In the impeller nozzle mechanism, an included angle between the lower end surface of the first plate and the lower end surface of the second plate is 135 °.

The impeller nozzle mechanism is characterized in that an annular flange is arranged on the inner edge of the upper end of the inner impeller ring plate, the annular flange is erected on the grinding bowl extension ring, and the annular flange and the grinding bowl extension ring are fixedly connected through a fixing bolt.

In the impeller nozzle mechanism, the bottom of the impeller inner ring plate is fixedly connected with the grinding bowl through the fixing piece; the fixing piece is L-shaped, the fixing piece comprises a vertical part and a horizontal part, the vertical part is in contact with the inner wall of the inner ring plate of the impeller, the bottom of the inner ring plate of the impeller and the side wall of the grinding bowl are in contact with the horizontal part, the vertical part is welded with the contact surface of the inner ring plate of the impeller, the bottom of the inner ring plate of the impeller is welded with the contact surface of the horizontal part, and the side wall of the grinding bowl is welded with the contact surface of the horizontal part.

A second aspect of the present invention provides a coal pulverizer comprising a side body unit and a separator disposed at the top of the side body unit, further comprising an impeller nozzle mechanism as defined in any one of claims 1 to 4, wherein the grinding bowl and the impeller assembly are disposed in the inner cavity of the side body unit, and the separator liner is mounted on the separator.

The coal mill comprises a separator, and is characterized in that a fixed ring plate is arranged at the bottom of the separator, the coal mill further comprises an adjusting ring, the adjusting ring surrounds the impeller assembly, and the adjusting ring is welded with the fixed ring plate.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the impeller nozzle mechanism in the utility model has the advantages that through the first plate body horizontally arranged along the radial direction of the impeller inner ring plate, the thrown materials are quickly decelerated and shaped and then separated, so that the problems that the slag material with larger specific gravity is blown out by hot air and coal is easily brought into the slag discharging box by the slag material are effectively avoided, the discharging quality and the service life of the coal mill are improved, and the energy consumption of the coal mill is reduced; in addition, through the setting of first plate body, greatly reduced the wearing and tearing speed of separator welt in the impeller nozzle mechanism use in this embodiment, and then improved the life of impeller nozzle mechanism in this embodiment greatly, the life 6000 ~ 8000 hours of impeller nozzle mechanism in this embodiment prolongs to more than 30000 hours.

2. The utility model provides an among the impeller nozzle mechanism, the impeller subassembly passes through annular turn-ups and mounting and extends the ring, grind the bowl and be connected with grinding the bowl respectively, has reduced the risk that the impeller subassembly easily dropped, has also reduced the wearing and tearing speed that grinds the bowl and extend the ring simultaneously.

3. The utility model provides a coal pulverizer goes out powder efficiency, goes out powder quality and life and improves greatly, the energy loss of coal pulverizer also greatly reduced simultaneously.

Drawings

FIG. 1 is a schematic diagram of a prior art impeller nozzle;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural view of an impeller nozzle in embodiment 1;

fig. 4 is a sectional view taken along line B-B in fig. 3.

The correspondence between each mark and the part name is as follows:

the grinding device comprises a grinding bowl 1, a separator lining plate 2, a grinding bowl extension ring 3, an impeller inner ring plate 4, an impeller outer ring plate 5, a guide plate 6, a first plate body 7, a second plate body 8, a fixing piece 9, an adjusting ring 10, a fixing ring plate 11, a fixing bolt 12, an air throttling ring 13, an annular flanging 14 and a separator 15.

Detailed Description

In order to make the technical means of the implementation of the present invention, for making the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below, and it is clear and completely described the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the utility model is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to be referred must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 3 and 4, the embodiment discloses an impeller nozzle mechanism, which comprises a grinding bowl 1 and a separator lining plate 2, wherein a ventilation nozzle is formed by a gap between the grinding bowl 1 and the separator lining plate 2, an impeller assembly is arranged between the grinding bowl 1 and the separator lining plate 2, a grinding bowl extension ring 3 is arranged on the grinding bowl 1, wherein the grinding bowl extension ring 3 is made of 35 steel, and the impeller assembly is made of high-chromium cast iron; the impeller assembly in the embodiment comprises an impeller inner ring plate 4, an impeller outer ring plate 5 arranged outside the impeller inner ring plate 4, and a plurality of guide plates 6 uniformly arranged between the impeller inner ring plate 4 and the impeller outer ring plate 5, wherein the impeller inner ring plate 4 is fixedly connected with a grinding bowl extension ring 3; the guide plate 6 comprises a first plate body 7 and a second plate body 8, one end of the first plate body 7 is fixedly connected with one end of the second plate body 8, an included angle between the lower end face of the first plate body 7 and the lower end face of the second plate body 8 is an obtuse angle, the first plate body 7 is arranged along the radial direction of the impeller inner ring plate 4, and the second plate body 8 is arranged along the radial direction of the impeller inner ring plate 4 in an inclined mode.

Specifically, the included angle between the lower end surface of the first plate 7 and the lower end surface of the second plate 8 is 135 °.

Further, the impeller inner ring plate 4, the impeller outer ring plate 5 and the grinding bowl extension ring 3 in the embodiment are all of a sectional structure, so that the installation and the disassembly are convenient.

When the impeller nozzle mechanism in the embodiment is used specifically, after coal on the grinding bowl is ground, when the coal is thrown out of the grinding bowl and passes through the impeller assembly under the action of centrifugal force, slag with large specific gravity is quickly decelerated under the action of the first plate body 7 and falls into the slag discharging box through the air channel between the adjacent guide plates, the coal which is ground into fine particles is also decelerated under the action of the first plate body 7, but the specific gravity of the coal is light and is easily carried away by high-speed hot air again, namely, the thrown material can be quickly decelerated and shaped through the first plate body 7 which is horizontally arranged along the radial direction of the impeller inner ring plate 4, the problems that the slag with large specific gravity is blown out by hot air and the coal is easily brought into the slag discharging box are effectively avoided, the discharging quality of the coal mill is improved, and the use energy consumption of the coal mill is reduced; furthermore, the first plate body 7 prevents coarse-grained materials from being blown out by hot air, and further greatly reduces the abrasion speed of the separator lining plate 2.

In addition, the inner edge of the upper end of the impeller inner ring plate 4 is provided with an annular flange 14, the annular flange 14 is erected on the grinding bowl extension ring 3, and the annular flange 14 and the grinding bowl extension ring 3 are fixedly connected through a fixing bolt 12. In addition, the bottom of the impeller inner ring plate 4 is fixedly connected with the grinding bowl 1 through a fixing piece 9; the fixing piece 9 is L-shaped, the fixing piece 9 comprises a vertical portion and a horizontal portion, the vertical portion is in contact with the inner side wall of the inner ring plate 4 of the impeller, the bottom of the inner ring plate 4 of the impeller and the side wall of the grinding bowl 1 are in contact with the horizontal portion, the vertical portion is welded with the contact surface of the inner ring plate 4 of the impeller, the bottom of the inner ring plate 4 of the impeller is welded with the contact surface of the horizontal portion, and the side wall of the grinding bowl 1 is welded with the contact surface of the horizontal portion. Among the prior art 4 lateral walls of impeller inner race board pass through fixing bolt 12 with the 3 lateral walls of grinding bowl extension ring to be connected, and after fixing bolt 12's bolt head was worn and torn in the use, there was the risk that the impeller subassembly easily dropped, the utility model discloses in through setting up annular turn-ups 14, extend ring 3 through fixing bolt 12 fixed connection through annular turn-ups 14 and grinding bowl, make grinding bowl 1 and 4 fixed connection of impeller inner race board through mounting 9, guaranteed the firm installation of impeller subassembly, reduced the risk that the impeller subassembly easily dropped, in addition, set up on grinding bowl extension ring 3 through annular turn-ups 14, reduced the wear loss in the grinding bowl extension ring 3 use, prolonged the life that grinding bowl extends ring 3.

In summary, in the impeller nozzle mechanism in the embodiment, the first plate body 7 horizontally arranged along the radial direction of the impeller inner ring plate 4 can quickly decelerate and reshape the thrown material and then separate the material, so that the coarse-grained material is effectively prevented from being blown out by hot air, the content of coarse grains in the granulated material discharged by the impeller nozzle in the embodiment is less than 0.1%, the discharge quality and the service life of the coal mill are improved, and the use energy consumption of the coal mill is reduced; in addition, through the setting of first plate body 7, greatly reduced in this embodiment the impeller nozzle mechanism use in the wear rate of grinding bowl extension ring 3 and separator welt 2, and then improved the life of impeller nozzle mechanism in this embodiment greatly, the life 6000 ~ 8000 hours of impeller nozzle mechanism in this embodiment prolongs to more than 30000 hours.

Example 2

The embodiment discloses a coal mill, including side organism device and the separator 15 of locating side organism device top, still include the impeller nozzle mechanism disclosed in embodiment 1, grinding bowl 1 and impeller subassembly are located side organism device intracavity, refer to fig. 3 and show, separator welt 2 is installed on separator 15, separator 15 bottom is equipped with retainer plate 11, the coal mill still includes adjusting ring 10, adjusting ring 10 encircles outside the impeller subassembly, adjusting ring 10 and retainer plate 11 welding. The material of the adjusting ring in this embodiment is 16 Mn. The welding of the adjusting ring 10 is facilitated by the provision of the retaining ring plate 11 such that the bottom of the separator 15 is flush. When the coal mill in the embodiment is used specifically, after the gap between the adjusting ring 10 and the impeller assembly is adjusted according to the field situation, the adjusting ring 10 is welded with the fixed ring plate 11 and the separator 15.

In the coal mill in the embodiment, the impeller nozzle mechanism in the embodiment 1 is adopted, so that the efficiency of the coal mill is greatly improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. An impeller nozzle mechanism is characterized by comprising a grinding bowl and a separator lining plate, wherein a ventilation nozzle is formed by a gap between the grinding bowl and the separator lining plate, an impeller assembly is arranged between the grinding bowl and the separator lining plate, a grinding bowl extension ring is arranged on the grinding bowl, the impeller assembly comprises an impeller inner ring plate, an impeller outer ring plate arranged outside the impeller inner ring plate, and a plurality of guide plates uniformly arranged between the impeller inner ring plate and the impeller outer ring plate, and the impeller inner ring plate is fixedly connected with the grinding bowl extension ring; the guide plate comprises a first plate body and a second plate body, one end of the first plate body is fixedly connected with one end of the second plate body, the lower end face of the first plate body is an obtuse angle with an included angle between the lower end faces of the second plate body, the first plate body is arranged along the radial horizontal direction of the impeller inner ring plate, and the second plate body is arranged along the radial inclined direction of the impeller inner ring plate.

2. An impeller nozzle mechanism according to claim 1, wherein the angle between the lower end surface of said first plate and the lower end surface of said second plate is 135 °.

3. The impeller nozzle mechanism as claimed in claim 1, wherein the inner edge of the upper end of the impeller inner ring plate is provided with an annular flange, the annular flange is overlapped on the grinding bowl extension ring, and the annular flange and the grinding bowl extension ring are fixedly connected through a fixing bolt.

4. The impeller nozzle mechanism according to claim 1, wherein the bottom of the impeller inner ring plate is fixedly connected with the grinding bowl through a fixing piece; the fixing piece is L-shaped, the fixing piece comprises a vertical part and a horizontal part, the vertical part is in contact with the inner wall of the inner ring plate of the impeller, the bottom of the inner ring plate of the impeller and the side wall of the grinding bowl are in contact with the horizontal part, the vertical part is welded with the contact surface of the inner ring plate of the impeller, the bottom of the inner ring plate of the impeller is welded with the contact surface of the horizontal part, and the side wall of the grinding bowl is welded with the contact surface of the horizontal part.

5. A coal pulverizer comprising a side body assembly and a separator disposed atop said side body assembly, further comprising an impeller nozzle mechanism as set forth in any of claims 1-4, said grinding bowl and said impeller assembly being disposed within said side body assembly cavity, said separator liner being mounted to said separator.

6. The coal pulverizer of claim 5, wherein the separator bottom is provided with a retaining ring plate, the coal pulverizer further comprising an adjustment ring surrounding the impeller assembly, the adjustment ring being welded to the retaining ring plate.

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