An impeller device and a coal mill

Abstract

The present invention provides an impeller device and a coal mill, relating to the technical field of coal grinding equipment. Among them, this impeller device is arranged in the side body device of the coal mill, and the coal mill includes a bowl device having a grinding bowl. The impeller device includes an impeller mechanism, which comprises an inner ring, an outer ring arranged around the inner ring, and a plurality of guide plates arranged in the guide gap between the inner ring and the outer ring and used to connect the two. The guide gap is divided into a plurality of guide chambers by the plurality of guide plates, and a guide port for air outlet is arranged at the upper part of the guide chamber, and the guide port is at the same height as the grinding bowl. The impeller device further includes a guiding mechanism arranged above the impeller mechanism, and an adjusting cover configured on the guiding mechanism. The adjusting cover can move up and down relative to the impeller mechanism to adjust the gap between the adjusting cover and the impeller mechanism. Among them, the coal mill includes a side body device, a separator device, a bowl device, a roller device and an impeller device. The impeller device is the impeller device described above in this case.

Description

Technical Field

[0001] The present invention relates to the technical field of coal grinding equipment, and more particularly, to an impeller device and a coal mill. Background Art

[0002] A coal mill is a device that grinds raw coal into pulverized coal and then sends the pulverized coal into the furnace of a boiler for combustion power generation. The coal mill mainly includes a side body device, a separator device, a grinding bowl device, a grinding roller device, and an impeller device. The hot air in the primary air duct can generate an upward lifting force through the impeller device, and the pulverized coal is subjected to primary separation by the separator device.

[0003] The design of the impeller device in the prior art is unreasonable. When the hot primary air passes through, the flow velocity is uneven, and the air flow is locally blocked, which is prone to generate turbulence, thus causing the problem of excessive discharge of pebble coal. In addition, the impeller device in the prior art is also prone to the phenomenon of hot primary air leakage, seriously affecting the primary separation effect of pulverized coal. In view of this, the inventor has proposed this application after studying the existing technologies. Summary of the Invention

[0004] The present invention provides an impeller device and a coal mill, aiming to improve the problems in the impeller device applied to the coal mill in the prior art, such as uneven primary air flow velocity, local air flow blockage, easy generation of turbulence, and excessive discharge of pebble coal.

[0005] To solve the above technical problems, the present invention provides an impeller device, which is arranged in the side body device of the coal mill. The coal mill includes a grinding bowl device having a grinding bowl.

[0006] The impeller device includes an impeller mechanism, which comprises an inner ring, an outer ring arranged around the inner ring, and a plurality of guide vanes arranged in a guide gap between the inner ring and the outer ring and used to connect the two. The guide gap is divided into a plurality of guide chambers by the plurality of guide vanes. A guide opening for air outlet is arranged at the upper part of the guide chamber, and the guide opening is at the same height as the grinding disk.

[0007] The impeller device further includes a guiding mechanism arranged above the impeller mechanism and an adjusting cover configured on the guiding mechanism. The adjusting cover can move up and down relative to the impeller mechanism to adjust the gap between the adjusting cover and the impeller mechanism.

[0008] As a further optimization, the guide vane is a geometric body in the shape of an airfoil.

[0009] As a further optimization, the number of the guide chambers is 36 - 56.

[0010] As a further optimization, the impeller device further includes an air throttle ring disposed at the diversion opening, and the air throttle ring is used to adjust the area of the diversion opening. The throat velocity of the air blown out through the diversion opening is 50 m / s - 70 m / s.

[0011] As a further optimization, the impeller mechanism is longitudinally disposed in the grinding bowl device.

[0012] As a further optimization, the impeller mechanism is connected to the grinding bowl device by bolts disposed longitudinally, and the impeller mechanism includes at least a protective cover for covering the bolts.

[0013] As a further optimization, the bolts are used to connect the inner ring and the grinding bowl device, and the protective cover is threadedly connected to the inner ring.

[0014] As a further optimization, the deflector includes an inclined section inclined in the diversion gap and an arc section connected to the inclined section and extending forward, and there is a smooth transition between the inclined section and the arc section.

[0015] The present application further provides a coal mill, including a side body device, a separator device, and a grinding bowl device, a grinding roller device, and an impeller device disposed in the side body device, and the impeller device is any one of the above-mentioned impeller devices.

[0016] By adopting the above technical solutions, the present invention can achieve the following technical effects:

[0017] 1. For the impeller device of the present invention, setting the diversion opening and the grinding bowl at the same height can greatly reduce the internal pressure drop and at the same time greatly reduce the unevenness of the local flow velocity, making the primary air flow more smoothly and evenly when passing through, and solving the problem of excessive discharge of pebble coal. At the same time, by adjusting the up and down of the adjusting cover, the gap between the adjusting cover and the impeller mechanism can be set to reduce the leakage of the primary air.

[0018] 2. For the impeller device of the present invention, its impeller mechanism is longitudinally arranged on the grinding bowl device by bolts, so the bolts are further away from the diversion chamber and the diversion opening, so the problem of bolt wear can be alleviated. In addition, the impeller mechanism is also provided with a protective cover for covering the bolts, so the service life of the bolts can be further improved and the risk of the impeller mechanism falling off can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 This is a schematic structural diagram of an impeller device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of an impeller mechanism according to an embodiment of the present invention;

[0022] Figure 3 is Figure 1 a partial sectional structural diagram in the A-A direction shown in;

[0023] Figure 4 This is a schematic structural diagram of a deflector according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of an impeller device in the prior art;

[0025] Figure 6 is Figure 5 a partial sectional structural diagram in the B-B direction shown in;

[0026] Markings in the figure: 100 - impeller device; 200 - grinding bowl device; 300 - separator device;

[0027] 110 - impeller mechanism; 111 - deflector; 112 - outer ring; 113 - inner ring; 114 - diversion port; 115 - diversion chamber; 120 - guiding mechanism; 130 - adjusting cover; 140 - air throttle ring; 150 - protective cover; 160 - connecting bolt; 1111 - inclined section; 1112 - arc section;

[0028] 210 - grinding bowl; 220 - extension ring. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0035] by Figure 1 、 Figure 2 and Figure 3As shown in the figure, this embodiment provides an impeller device for being arranged inside the side body device of a coal mill. The coal mill includes a rotating grinding bowl device 200, and the grinding bowl device 200 further includes a grinding bowl 210 and an extension ring 220. In this embodiment, the impeller device 100 includes an impeller mechanism 110, a guiding mechanism 120 arranged above the impeller mechanism 110, and an adjusting cover 130 configured on the guiding mechanism 120. Specifically:

[0036] As shown by Figure 3 the figure, the impeller mechanism 110 includes an inner ring 113, an outer ring 112 arranged around the inner ring 113, and a plurality of flow guiding plates 111 for connecting the inner ring 113 and the outer ring 112. Among them, an annular flow guiding gap is formed between the inner ring 113 and the outer ring 112, and the plurality of flow guiding plates 111 are respectively arranged in the annular flow guiding gap, and the plurality of flow guiding plates 111 evenly divide the flow guiding gap into a plurality of flow guiding chambers 115. Flow guiding ports 114 for air outlet are arranged at the upper parts of these flow guiding chambers 115. It should be emphasized that these flow guiding ports 114 are at the same height as the grinding bowl. The rotating grinding bowl device 200 belongs to the conventional technical means in the art and will not be elaborated here

[0037] As further shown by Figure 3 the figure, the impeller device 100 further includes a guiding mechanism 120 arranged above the impeller mechanism 110, and an adjusting cover 130 configured on the guiding mechanism 120. The adjusting cover 130 can move up and down relative to the impeller mechanism 110 to adjust the gap between the adjusting cover 130 and the impeller mechanism 110. Among them, in this embodiment, the adjusting cover 130 is an L-shaped geometric body. In another embodiment, the adjusting cover 130 can be of other shapes and will not be elaborated here.

[0038] It should be noted that through the above settings, in the impeller device 100 of this embodiment, by setting the flow guiding ports 114 and the grinding bowl at the same height, the internal pressure drop can be greatly reduced, and at the same time, the situation of uneven local flow velocity can be greatly reduced, making the primary air flow more smoothly and evenly when passing through, and solving the problem of excessive discharge of pebble coal. At the same time, by adjusting the up and down of the adjusting cover 130, the gap between the adjusting cover 130 and the impeller mechanism 110 can be set, greatly reducing the problem of primary air leakage and increasing the wind speed of the primary air blown out from the flow guiding ports 114. In addition, in this embodiment, the number of the flow guiding plates 111 is such that the flow guiding gap can be evenly divided into 36 - 56 flow guiding chambers 115. Of course, in another embodiment, the number of the flow guiding chambers 115 can be set to other values to meet the rationality, uniformity and stability of the wind speed of the hot primary air blown out from the flow guiding ports 114.

[0039] As shown by Figure 3As shown, in this embodiment, the impeller device 100 further includes an air throttle ring 140 disposed at the air guide port 114. By providing the air throttle ring 140, the area of the air guide port 114 is adjusted. The throat velocity of the air blown out through the air guide port 114 is 50 m / s - 70 m / s, and the differential pressure of the grinding bowl 210 is less than 3.25 KPa. The above settings can ensure that the wind speed generated by the impeller device 100 is appropriate, further avoiding problems such as excessive pebble coal emissions.

[0040] As Figure 5 and Figure 6 shown, Figure 5 and Figure 6 are schematic structural diagrams of the impeller device 100 in the prior art. As Figure 6 can be seen, in the prior art, the impeller mechanism 110 is horizontally connected to the grinding bowl device 200 through horizontally arranged connecting bolts 160, and the nuts of the connecting bolts 160 are exposed in the direction of the guide chamber 115. As a result, during long-term use, the bolts will be quickly worn and the impeller mechanism 110 will fall off, seriously affecting the operation of the coal mill.

[0041] Furthermore, as Figure 3 shown, in this embodiment, the impeller mechanism 110 is longitudinally arranged on the grinding bowl device 200 through longitudinally arranged bolts, and the impeller mechanism 110 further includes at least a protective cover 150 for covering the bolts. Among them, the bolts are used to connect the inner ring 113 and the grinding bowl device 200, which ensures that the bolts are further away from the guide chamber 115 and the air guide port 114. Therefore, the problem of bolt wear can be greatly alleviated. In addition, the protective cover 150 is connected to the inner ring 113 by means of threaded connection, which can further protect the bolts, improve the service life of the bolts, and reduce the risk of the impeller mechanism 110 falling off during long-term use.

[0042] In addition, as Figure 4 shown, in this embodiment, the guide vane 111 is a multi-curved geometric body in the shape of an airfoil, and the guide vane 111 is formed by casting with wear-resistant alloy steel, and the guide surface is streamlined. Specifically, the guide vane 111 includes an inclined section 1111 inclined in the guide gap, and an arc section 1112 connected to the inclined section 1111 and extending forward, and the transition between the inclined section 1111 and the arc section 1112 is smooth. The above-described guide vane 111 can reduce the ventilation resistance, make the wind speed and wind pressure more stable, and avoid the generation of turbulence.

[0043] Another coal mill is provided in this embodiment, which includes a side body device, a separator device 300, and a grinding bowl device 200, a grinding roller device, and an impeller device 100 disposed in the side body device. Among them, the impeller device 100 is the impeller device 100 described above in this embodiment. The coal mill provided with the impeller device 100 of this embodiment can generate a uniform and stable wind speed to better perform primary separation on pulverized coal. At the same time, it can ensure that during long-term use, the impeller mechanism 110 can still be firmly configured on the grinding bowl device 200, improving the reliability of use of the coal mill.

[0044] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An impeller device is disposed within a side body device of a coal mill. The coal mill includes a bowl device (200) having a grinding bowl. It is characterized in that the impeller device (100) includes an impeller mechanism (110). The impeller mechanism (110) includes an inner ring (113), an outer ring (112) disposed around the inner ring (113), and a plurality of guide vanes (111) disposed in a guide gap between the inner ring (113) and the outer ring (112) and used to connect the two. The guide gap is divided into a plurality of guide chambers (115) by the plurality of guide vanes (111). A guide opening (114) for air outlet is provided at the upper part of the guide chamber (115), and the guide opening (114) is at the same height as the grinding bowl; the impeller device (100) further includes a guiding mechanism (120) disposed above the impeller mechanism (110), and an adjusting cover (130) configured on the guiding mechanism (120). The adjusting cover (130) can move up and down relative to the impeller mechanism (110) to adjust the gap between the adjusting cover (130) and the impeller mechanism (110); wherein, the impeller mechanism (110) is connected to the bowl device (200) by longitudinally arranged bolts. The impeller mechanism (110) includes at least a protective cover (150) for covering the bolts. The bolts are used to connect the inner ring (113) and the bowl device (200), and the protective cover (150) is threadedly connected to the inner ring (113); wherein, the guide vane (111) includes an inclined section (1111) inclined in the guide gap, and an arc section (1112) connected to the inclined section (1111) and extending forward. The transition between the inclined section (1111) and the arc section (1112) is smooth; moreover, the adjusting cover (130) is an L-shaped geometric body, the guide vane (111) is a wing-shaped geometric body, and the impeller device (100) further includes an air throttle ring (140) disposed at the guide opening (114). The air throttle ring (140) is used to adjust the area of the guide opening (114). The throat velocity of the air blown out through the guide opening (114) is 50 m / s - 70 m / s.

2. The impeller device according to claim 1, characterized in that , the number of the guide chambers (115) is 36 - 56.

3. A kind of impeller device according to claim 1, characterized in that , the impeller mechanism (110) is longitudinally disposed on the bowl device (200).

4. A coal mill, comprising a side body device, a separator device (300), and a grinding bowl device (200), a grinding roller device, and an impeller device (100) disposed within the side body device, characterized in that, The impeller device (100) is the impeller device (100) according to any one of claims 1 - 3.

Images