A sealing device for a coal mill, a coal mill and a sealing method for a coal mill

Abstract

The present invention relates to a sealing device for a coal mill, a coal mill and a sealing method for a coal mill, comprising: a driving disc, the driving disc including a rotating part and a connecting disc body; a protective ring is fixedly connected to the outside of the rotating part; a dynamic sealing structure is fixedly connected to the sealing support seat, and a rotatable seal is formed between the dynamic sealing structure and the protective ring. Through the arrangement of the protective ring, a greater pressure can be borne between the dynamic sealing structure and the protective ring, improving the sealing performance. The protective ring and the rotating part are made of materials with different hardnesses, so that it can be better adapted to the dynamic sealing device and achieve a better sealing effect. Further, through the arrangement of the first gap, coal powder and other impurities can be effectively excluded from the first cavity. Through the arrangement of the second gap, it can prevent coal powder and other impurities that enter the first cavity from entering between the dynamic sealing structure and the protective ring. At the same time, it can effectively remove coal powder and other impurities that may enter between the dynamic sealing structure and the protective ring from the first cavity or the outside. Through multiple designs, the present invention can meet the high sealing requirements of the coal mill and significantly improve the service life of the coal mill.

Description

Technical Field

[0001] The present invention relates to the field of sealing of equipment in the power plant, cement plant and coal chemical industry, and particularly relates to a sealing device for a coal mill, a coal mill and a sealing method for a coal mill. Background Art

[0002] A coal mill is a commonly used industrial machine, which is a device that grinds large coal particles into pulverized coal by the relative movement of grinding rollers and track liners. For example, a vertical mill commonly used in industry is a type of coal mill, which is widely used in industries such as thermal power generation, coal chemical industry, and cement.

[0003] Due to the non-renewability of coal resources, the rapid economic development and environmental protection issues, it is particularly important to optimize and improve the comprehensive performance of coal mills, including the performance of sealing devices.

[0004] However, the existing sealing device for the coal mill base has the following deficiencies: the structure is relatively complex, which is not conducive to later maintenance. The wear of the driving disc is relatively serious, and the driving disc cannot be effectively protected, resulting in an increase in later maintenance costs. The sealing effect is poor, and it cannot effectively prevent the leakage of coal slag and dust. Summary of the Invention

[0005] In order to alleviate or solve at least one aspect or at least one point of the above problems, the present invention is proposed.

[0006] According to one aspect of the present invention, the present invention provides a sealing device for a coal mill, including: a driving disc, the driving disc includes a rotating part and a connecting disc body; a protective ring is fixedly connected to the outside of the rotating part; a dynamic sealing structure is fixedly connected to the sealing support seat, and a rotatable seal is formed between the dynamic sealing structure and the protective ring.

[0007] By fixedly connecting a protective ring to the outside of the rotating part in the present invention, the rotating part can be effectively protected; at the same time, due to the replaceability of the protective ring, the protective ring can bear a greater dynamic sealing pressure, improving the sealing performance. At the same time, by setting the protective ring and the rotating part to use different materials, a better dynamic seal can be formed between the dynamic sealing structure and the protective ring. For example, the hardness of the protective ring material can be set to be less than the hardness of the rotating part material; furthermore, through the deformable adaptability, better sealing can be provided.

[0008] In order to achieve a better sealing effect, the present invention also provides the following preferred technical solutions:

[0009] Preferably, the sealing support seat includes a first support frame and a second support frame, the dynamic sealing structure is fixedly connected to the first support frame; the second support frame surrounds the rotating part, one end of the second support frame is fixedly connected to the first support frame, and the other end forms a first gap with the driving disc.

[0010] Preferably, the drive disk is formed with a first extension portion, and the other end of the second support frame is formed with an end portion and a second extension portion; a first gap is formed between the first extension portion and the second extension portion and the end portion, and the cross-section of the first gap in the vertical direction is L-shaped.

[0011] Preferably, the second extension portion is formed with an inclined surface at a first preset angle with the horizontal direction.

[0012] Preferably, at one end of the first support frame close to the rotating portion, a blocking portion is fixed to the upper part thereof, and the dynamic sealing structure is fixedly connected to the lower part thereof.

[0013] Preferably, the protective ring is provided with a mating portion, and a second gap is formed between the mating portion and the blocking portion.

[0014] Preferably, the hardness of the protective ring is less than the hardness of the rotating portion.

[0015] Preferably, the dynamic sealing structure includes: a sealing seat; a plurality of accommodation grooves are formed on the sealing seat, and the sealing member is arranged in the accommodation groove.

[0016] Preferably, a first cavity is formed between the sealing support seat and the drive disk; a sealing air inlet communicating with the first cavity is opened on the first support frame, and / or a slag discharge port communicating with the first cavity is opened on the first support frame.

[0017] According to another aspect of the present invention, the present invention further provides a coal mill, including the foregoing sealing device.

[0018] According to another aspect of the present invention, the present invention further provides a sealing method for a coal mill, including the foregoing sealing device, and sealing gas is introduced through the sealing air inlet to make the pressure in the first cavity greater than the external pressure.

[0019] By providing a protective ring on the rotating portion, the present invention can effectively protect the rotating portion and prevent wear between the dynamic sealing structure and the rotating portion; by setting the protective ring and the rotating portion with materials of different hardnesses, it can be better adapted to the dynamic sealing device and achieve a better sealing effect. Further, through the setting of the first gap, coal powder and other impurities can be effectively excluded from the first cavity. Through the setting of the second gap, it can prevent coal powder and other impurities entering the first cavity from entering between the dynamic sealing structure and the protective ring, and at the same time, it can effectively remove coal powder and other impurities that may enter from the first cavity or the outside between the dynamic sealing structure and the protective ring. Through multiple designs, the present invention can meet the high sealing requirements of the coal mill and significantly improve the service life of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a sealing device of a coal mill according to an exemplary embodiment of the present invention.

[0021] Figure 2 is Figure 1 A partial enlarged schematic view of the left part.

[0022] Figure 3 is Figure 1 A partial enlarged schematic view of the right part.

[0023] 1 - drive disk, 11 - rotating part, 12 - connecting disk body, 13 - first cavity, 2 - sealed support seat, 21 - first support frame, 22 - second support frame, 23 - dynamic sealing structure, 24 - sealing groove, 3 - sealed air inlet, 4 - slag discharge port, 51 - first extension part, 52 - second extension part, 53 - end part, 6 - protective ring, 7 - blocking part, 8 - mating part, 9 - housing Detailed implementation mode

[0024] The following description of the embodiments of the present invention with reference to the drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation on the present invention. In the present invention, the same reference numerals represent the same or similar components.

[0025] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. On the contrary, the examples provided herein are only to illustrate some of the many feasible ways of implementing the methods, devices, and / or systems described herein, and many other feasible ways will be apparent after understanding the disclosure of the present invention.

[0026] Although terms such as "first", "second", and "third" may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. On the contrary, these terms are only used to distinguish one component, assembly, region, layer, or part from another component, assembly, region, layer, or part.

[0027] In the specification, when an element (such as a layer, region, or substrate) is described as "on", "connected to", or "coupled to" another element, the element can be directly "on", directly "connected to", or "coupled to" another element, or there can be one or more other elements in between. On the contrary, when an element is described as "directly on", "directly connected to", or "directly coupled to" another element, there can be no other elements in between.

[0028] The terms used herein are for describing various examples only and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" specify the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0029] In order to enable those skilled in the art to use the content of the present invention, the following exemplary embodiments may be given below in combination with specific application scenarios, parameters of specific systems, devices and components, and specific connection methods. However, for those skilled in the art, these embodiments are only examples, and the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of the present invention.

[0030] According to an exemplary embodiment of the present invention: as Figures 1-3 shown, a sealing device for a coal mill includes: a driving disc 1, the driving disc 1 includes a rotating part 11 and a connecting disc body 12; a protective ring 6 is fixedly connected to the outside of the rotating part 11; a dynamic sealing structure 23 is fixedly connected to the sealing support seat 2, and a rotatable seal is formed between the dynamic sealing structure 23 and the protective ring 6.

[0031] By fixedly connecting a protective ring 6 to the outside of the rotating part 11, the present invention can effectively protect the rotating part 11; at the same time, by setting the protective ring 6 and the rotating part 11 to use different materials, a better dynamic seal can be formed between the dynamic sealing structure 23 and the protective ring 6. For example, the hardness of the material of the protective ring 6 can be set to be less than the hardness of the material of the rotating part 11; furthermore, better sealing can be provided through the deformable adaptability. The protective ring 6 can be fixed to the rotating part 11 by welding. Preferably, the two are detachably fixedly connected, so that the protective ring 6 can be conveniently replaced.

[0032] According to an exemplary embodiment of the present invention, the sealing support seat 2 includes a first support frame 21 and a second support frame 22, and a dynamic sealing structure 23 is fixedly connected to the first support frame 21. The second support frame 22 is arranged around the rotating part 11, one end of the second support frame 22 is fixedly connected to the first support frame 21, and optionally, the two are welded. The other end forms a first gap with the driving disc 1. Among them, the first support frame 21 is horizontally arranged, and the second support frame 22 is vertically arranged.

[0033] As Figure 1 shown, the driving disc 1 is formed with a first extension part 51, and the other end of the second support frame 22 is formed with an end part 53 and a second extension part 52; a first gap is formed between the first extension part 51 and the second extension part 52 and the end part 53. Preferably, the cross-section of the first gap in the vertical direction is L-shaped.

[0034] The space between the sealing support seat 2 and the transmission plate 1 is transformed into a first cavity 13, and the first cavity 13 is communicated with the outside through a first gap.

[0035] The first support frame 21 is provided with a sealed air inlet 3 communicating with the first cavity 13 ; optionally, the first support frame 21 is provided with a slag discharge port 4 communicating with the first cavity 13 .

[0036] By setting the first gap, the coal powder outside the second support frame 22 can be effectively prevented from entering the first cavity 13. The coal powder outside the second support frame 22 must first enter the vertical part of the L-shaped gap and gather in the horizontal part of the L-shaped gap. During the operation of the coal mill, sealed air will be introduced into the first cavity 13 through the sealed air inlet 3. The pressure of the sealed air is usually higher than the pressure of the external gas, so the sealed air can blow out impurities such as coal powder gathered in the horizontal part of the L-shape in the reverse direction. Preferably, the horizontal part of the L-shaped first gap is inclined. Among them, the height close to one end of the first cavity is higher than the height away from the other end of the first cavity. Through the above-mentioned setting, coal powder and the like can be further prevented from entering the first cavity 13.

[0037] According to an exemplary embodiment of the present invention, the second extension portion 52 is formed with an inclined surface at a first preset angle to the horizontal direction. The first preset angle is greater than 75 degrees. The setting of the inclined surface can effectively prevent coal powder from entering the first gap, and further prevent coal powder and other impurities from entering the first cavity 13.

[0038] According to an exemplary embodiment of the present invention, a blocking portion 7 is fixed to the upper portion of one end of the first support frame 21 close to the rotating portion 11, and the blocking portion 7 can prevent coal powder from entering between the dynamic sealing structure 23 and the protective ring 6, thereby protecting both.

[0039] The dynamic sealing structure 23 is fixedly connected to the lower part of one end of the first support frame 21 close to the rotating part 11. Preferably, a matching part 8 is also provided, and a second gap is formed between the matching part 8 and the blocking part 7. Optionally, the matching part 8 is fixed on the protective ring 6.

[0040] In the existing coal mill, since the dynamic seal structure 23 and the rotating part 11 of the transmission disc 1 form a relatively rotating dynamic seal, coal powder often enters between the dynamic seal structure 23 and the transmission disc 1, which easily causes wear between the rotating part 11 of the transmission disc 1 and the dynamic seal structure 23.

[0041] The present invention can effectively block pulverized coal between the second support frame 22 and the blocking portion 7 through the blocking portion 7, preventing the pulverized coal from entering between the dynamic seal structure 23 and the rotating portion 11; since the protective ring 6 is fixedly provided on the rotating portion 11 in the present invention, therefore, it can prevent the pulverized coal from entering between the dynamic seal structure 23 and the protective ring 6 and prevent wear. Further, through the arrangement of the matching portion 8, a second gap is formed between the matching portion 8 and the blocking portion 7, further effectively preventing the pulverized coal from entering between the dynamic seal structure 23 and the protective ring 6; at the same time, through the arrangement of the second gap, in cooperation with the sealing air, a small amount of pulverized coal and other impurities entering between the dynamic seal structure 23 and the protective ring 6 can be blown out by the sealing air, because during operation, it is possible that pulverized coal enters between the dynamic seal structure 23 and the protective ring 6 from the first cavity 13, and it is also possible that a small amount of pulverized coal and other impurities enter between the dynamic seal structure 23 and the protective ring 6 from the outside.

[0042] According to an exemplary embodiment of the present invention, a slag discharge port 4 is further provided on the first support frame 21. Through the arrangement of the slag discharge port 4, pulverized coal and other impurities can be discharged in time, preventing them from accumulating and spreading in the first cavity 13.

[0043] According to an exemplary embodiment of the present invention, the dynamic seal structure 23 of the present invention includes: a seal seat, multiple accommodating grooves 24 are formed on the seal seat, and a seal member is arranged in the accommodating grooves 24. Preferably, the seal member includes a carbon seal ring and a soft seal assembly, and the soft seal assembly is arranged on the outer periphery of the carbon seal ring. The carbon seal ring and the soft seal have good high-temperature resistance, wear resistance and self-lubrication performance. The soft seal closely adheres to the transmission disk 1 and the protective ring 6, avoiding leakage of the sealing air from here to the outside. It ensures the establishment of the sealing air pressure in the sealing chamber. The air pressure in the sealing chamber is higher than that of the slag discharge chamber communicated with the slag discharge port 4, ensuring that coal slag cannot enter the sealing chamber and at the same time avoiding leakage of the sealing air.

[0044] According to an exemplary embodiment of the present invention, the seal support seat 2 is fixedly connected to the housing 9 of the coal mill, and the two can be welded. Optionally, the connection between the protective ring 6 and the rotating portion 11 is welding or an interference fit connection between the two.

[0045] As Figures 1-3 shown, when the present invention works specifically, the transmission disk 1 rotates relative to the dynamic seal structure 23, and sealing air is introduced through the sealing air inlet 3. The pressure of the sealing air is greater than the external pressure, making the pressure in the first cavity 13 greater than the external pressure, preventing pulverized coal and the like from entering the first cavity 13. After working for a period of time, the slag discharge port 4 is opened as needed for slag discharge.

[0046] In the present invention, a protective ring 6 is provided on the rotating part 11, which can effectively protect the rotating part 11 and prevent wear between the dynamic sealing structure 23 and the rotating part 11. By setting the protective ring 6 and the rotating part 11 with materials of different hardnesses, it can be better adapted to the dynamic sealing device and achieve a better sealing effect. Further, through the setting of the first gap, coal powder and other impurities can be effectively excluded from the first cavity 13. Through the setting of the second gap, it can prevent coal powder and other impurities that enter the first cavity 13 from entering between the dynamic sealing structure 23 and the protective ring 6. At the same time, it can effectively remove coal powder and other impurities that may enter between the dynamic sealing structure 23 and the protective ring 6 from the first cavity 13 or the outside. Through multiple designs, the present invention can meet the high sealing requirements of the coal mill and significantly improve the service life of the coal mill.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that these embodiments can be changed and combined with elements without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a coal mill, characterized in that: Comprising: A transmission disc (1), the transmission disc (1) comprising a rotating part (11) and a connecting disc body (12); A protective ring (6) is fixedly connected to the outside of the rotating part (11); A dynamic sealing structure (23) is fixedly connected to the sealing support seat (2), and a rotatable seal is formed between the dynamic sealing structure (23) and the protective ring (6); The sealing support seat (2) comprises a first support frame (21) and a second support frame (22), the dynamic sealing structure (23) is fixedly connected to the first support frame (21); the second support frame (22) is arranged around the rotating part (11), one end of the second support frame (22) is fixedly connected to the first support frame (21), and the other end forms a first gap with the transmission disc (1); The transmission disc (1) forms a first extension part (51), and the other end of the second support frame (22) forms an end part (53) and a second extension part (52); a first gap is formed between the first extension part (51) and the second extension part (52) and the end part (53), and the cross-section of the first gap in the vertical direction is L-shaped; The second extension part (52) forms an inclined surface at a first preset angle with the horizontal direction; A first cavity (13) is formed between the sealing support seat (2) and the transmission disc (1); a sealing air inlet (3) communicating with the first cavity (13) is provided on the first support frame (21), and / or a slag discharge port (4) communicating with the first cavity (13) is provided on the first support frame (21); The horizontal part of the first gap is inclined, wherein the height of the end close to the first cavity (13) is higher than the height of the end far from the first cavity (13); At the end of the first support frame (21) close to the rotating part (11), a blocking part (7) is fixed to the upper part thereof, and the dynamic sealing structure (23) is fixedly connected to the lower part thereof; The protective ring (6) is provided with a matching part (8), and a second gap is formed between the matching part (8) and the blocking part (7).

2. The sealing device according to claim 1, characterized in that: The hardness of the protective ring (6) is less than the hardness of the rotating part (11).

3. A coal mill, characterized in that: Comprising the sealing device according to any one of claims 1-2.

4. A sealing method for a coal mill, characterized in that: Comprising the sealing device according to any one of claims 1-2; a sealing gas is introduced through the sealing air inlet (3) to make the pressure in the first cavity (13) greater than the external pressure.

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