A coal mill carbon sealing ring

Abstract

This invention provides a coal mill carbon seal ring. It includes a frame plate with a groove within it, and multiple segments of the carbon seal ring body are housed within the groove. Each segment of the carbon seal ring body has a rib groove on one side. In this invention, by employing a segmented carbon seal ring, adjacent bodies are fitted together through the matching ribs and rib grooves, improving the positioning accuracy and sealing performance at the segmentation points and reducing leakage caused by splicing gaps. A ring-shaped pre-tightening spring applies uniform radial pressure to the segmented bodies through the ring groove, ensuring a tight fit between the seal ring and the shaft surface and reducing excessive local wear. Furthermore, the integrated air storage chamber on the mounting plate, along with the electric air pump, air delivery pipe, and circumferentially distributed jet nozzles, works synergistically to form a uniform air curtain, preventing coal dust from intruding into the sealing gap. Simultaneously, the airflow carries away frictional heat from the sealing surface, delaying the aging of the carbon material and extending the service life of the seal ring while reducing the risk of leakage.

Description

Technical Field

[0001] This utility model relates to sealing components for coal mills, and in particular to a carbon precision sealing ring for coal mills, belonging to the technical field of industrial pulverizing equipment. Background Technology

[0002] The coal mill carbon seal ring is a key sealing component installed between the rotating parts (such as the main shaft and drive shaft) and the stationary housing of the coal mill. Its core material is carbon, and its main function is to form a sealing pair between the rotating and stationary parts under the operating conditions of the coal mill, so as to achieve sealing.

[0003] CN217481968U discloses a sealing device for the lower frame of a medium-speed coal mill, including a rotating disk and a lower frame sealing assembly. The lower frame sealing assembly includes a sealing ring and a top cover ring. A first carbon ring is disposed in a groove at the top of the inner cavity of the sealing ring, and an upper carbon ring spring is disposed in a groove on the outer side edge of the first carbon ring. A second carbon ring and a third carbon ring are disposed in two grooves at the bottom of the inner cavity of the sealing ring, respectively, as well as a middle carbon ring spring in the groove of the second carbon ring and a lower carbon ring spring in the groove of the third carbon ring. The inner walls of the second and third carbon rings are rotatably connected to the rotating disk. This sealing device can prevent hard objects such as stones and coal from entering the sealing ring, greatly extending its service life, effectively extending the operating cycle of the coal mill, reducing equipment maintenance workload, saving a lot of spare parts and maintenance costs, and ensuring the safe and stable operation of the coal mill.

[0004] However, traditional coal mill carbon-precipitated sealing rings mostly adopt an integral structure, which lacks proper positioning and pre-tightening design, making it difficult to guarantee the accuracy of the sealing gap after assembly. Coal dust can easily intrude into the sealing surface through the gap, accelerating the wear of the seal. In addition, traditional carbon-precipitated sealing rings lack a dedicated air curtain protection structure, leaving the sealing surface directly exposed to the scouring environment of coal dust. The continuous impact of coal dust particles will accelerate the wear of the sealing surface and significantly shorten the service life of the sealing ring, requiring improvement.

[0005] Therefore, a carbon precision sealing ring for coal mills is proposed. Utility Model Content

[0006] In view of this, the present invention provides a coal mill carbon sealing ring to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0007] The technical solution of this utility model is implemented as follows: A coal mill carbon sealing ring includes a frame plate, a groove is provided in the frame plate, a multi-part carbon sealing ring body is provided in the groove, a rib groove is provided on one side of the multi-part carbon sealing ring body, a rib strip adapted to the rib groove is installed on the other side of the multi-part carbon sealing ring body, an annular groove is provided on the multi-part carbon sealing ring body, a pre-tightening spring is provided on the annular groove, an mounting plate is installed on the frame plate, a gas storage chamber is installed in the mounting plate, a gas pressure valve is provided on the gas storage chamber, a gas supply pipe is connected to the gas storage chamber, an annular gas supply plate is installed on the frame plate, a multi-part air jet is arranged on the annular gas supply plate, a connecting pipe is connected to the gas storage chamber, and an electric air pump is connected to one end of the connecting pipe.

[0008] More preferably, the preload spring is ring-shaped.

[0009] More preferably, the number of the segmented carbon seal ring bodies is eight, and adjacent segments of the carbon seal ring bodies are connected by ribs and grooves.

[0010] More preferably, the gas delivery pipe passes through the frame plate and is connected to the annular gas delivery plate.

[0011] More preferably, a check valve is provided on the connecting pipe.

[0012] More preferably, the jet heads are distributed in a circumferential shape on the annular air delivery plate.

[0013] The present invention has the following advantages due to the adoption of the above technical solution:

[0014] In this invention, a segmented carbon powder sealing ring is adopted. Adjacent bodies are fitted together via ribs and grooves, improving the positioning accuracy and sealing performance at the segmentation points and reducing leakage caused by splicing gaps. A ring-shaped pre-tensioning spring applies uniform radial pressure to the segmented bodies through the ring groove, ensuring a tight fit between the sealing ring and the shaft surface and reducing excessive localized wear. Furthermore, the integrated air storage chamber on the mounting plate, along with the electric air pump, air supply pipe, and circumferentially distributed jet nozzles, works synergistically to form a uniform air curtain, preventing coal dust from entering the sealing gap. Simultaneously, the airflow carries away frictional heat from the sealing surface, delaying the aging of the carbon powder material, extending the service life of the sealing ring, and reducing the risk of leakage.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the connection mechanism between the groove and the rib in this utility model;

[0021] Figure 5 In this utility model Figure 4 Internal structural diagram.

[0022] Reference numerals: 1. Frame plate; 2. Groove; 3. Split carbon seal ring body; 4. Rib groove; 5. Rib; 6. Annular groove; 7. Preload spring; 8. Mounting plate; 9. Air storage chamber; 10. Air pressure valve; 11. Air supply pipe; 12. Annular air supply plate; 13. Jet nozzle; 14. Connecting pipe; 15. Electric air pump; 16. Check valve. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0024] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1-5As shown, this utility model embodiment provides a coal mill carbon sealing ring, including a frame plate 1, a groove 2 is provided in the frame plate 1, a multi-part carbon sealing ring body 3 is provided in the groove 2, a rib groove 4 is provided on one side of the multi-part carbon sealing ring body 3, a rib 5 adapted to the rib groove 4 is installed on the other side of the multi-part carbon sealing ring body 3, an annular groove 6 is provided on the multi-part carbon sealing ring body 3, a pre-tightening spring 7 is provided on the annular groove 6, an mounting plate 8 is installed on the frame plate 1, a gas storage chamber 9 is installed in the mounting plate 8, a pressure valve 10 is provided on the gas storage chamber 9, a gas supply pipe 11 is connected to the gas storage chamber 9, an annular gas supply plate 12 is installed on the frame plate 1, a multi-part air jet head 13 is arranged on the annular gas supply plate 12, a connecting pipe 14 is connected to the gas storage chamber 9, and an electric air pump 15 is connected to one end of the connecting pipe 14.

[0026] In one embodiment, the preload spring 7 is annular in shape. The annular preload spring 7 applies uniform radial pressure to the segmented carbon seal ring body 3 by its own elasticity, pushing the segmented carbon seal ring body 3 toward the direction of the coal mill drive shaft.

[0027] In one embodiment, there are eight sets of segmented carbon seal ring bodies 3, and adjacent sets of segmented carbon seal ring bodies 3 are connected by interlocking ribs 5 and grooves 4. The interlocking action of adjacent segmented carbon seal ring bodies 3 by ribs 5 and grooves 4 achieves tight splicing, which can eliminate the splicing gap at the segmentation.

[0028] In one embodiment, the air supply pipe 11 passes through the frame plate 1 and is connected to the annular air supply plate 12. Compressed air generated by the electric air pump 15 is delivered to the air storage chamber 9 in the mounting plate 8 through the connecting pipe 14, and compressed air is delivered to the annular air supply plate 12 through the air supply pipe 11.

[0029] In one embodiment, a check valve 16 is provided on the connecting pipe 14. The check valve 16 on the connecting pipe 14 can prevent compressed air from flowing back in reverse, thus preventing coal powder in the coal mill from entering the air storage chamber 9 through the connecting pipe 14 when the machine is stopped.

[0030] In one embodiment, the jet nozzles 13 are distributed circumferentially on the annular air conveying plate 12. Compressed air is evenly ejected through the jet nozzles 13, forming an annular air curtain between the segmented carbon fine sealing ring body 3 and the drive shaft. The air curtain can directly prevent coal powder in the coal mill from intruding into the sealing gap.

[0031] In operation, this invention first splices the eight-part segmented carbon concentrate sealing ring body 3. Adjacent segmented carbon concentrate sealing ring bodies 3 are tightly spliced ​​through the interlocking action of the ribs 5 and the grooves 4, eliminating the splicing gaps at the segmentation points. Then, the annular pre-tightening spring 7 is sleeved on the annular groove 6 of the segmented carbon concentrate sealing ring body 3. Then, the assembled segmented carbon concentrate sealing ring body 3 is placed into the corresponding grooves 2 of the frame plate 1. The pre-tightening spring 7 applies uniform radial pressure to the segmented carbon concentrate sealing ring body 3 based on its own elasticity, pushing the segmented carbon concentrate sealing ring body 3 closer to the direction of the coal mill drive shaft, so that the inner wall of the segmented carbon concentrate sealing ring body 3 is tightly fitted with the surface of the drive shaft, forming the initial mechanical seal structure. This not only avoids the intrusion of coal powder due to the gap between the segmented body and the shaft, but also prevents the segmented carbon concentrate sealing ring body 3 from cracking or excessive wear due to excessive local pressure, ensuring the stability of the seal. When in operation, the electric air pump 15 is started. The compressed air generated by the electric air pump 15 is delivered to the air storage chamber 9 in the mounting plate 8 through the connecting pipe 14. The compressed air is delivered to the annular air conveying plate 12 through the air conveying pipe 11. Since the jet nozzles 13 are distributed in a circular shape on the annular air conveying plate 12, the compressed air is evenly sprayed out through the jet nozzles 13, forming an annular air curtain between the segmented carbon seal ring body 3 and the drive shaft. The air curtain can directly block the coal powder in the coal mill from intruding into the sealing gap, further enhancing the sealing effect. At the same time, the sprayed airflow will carry away the heat generated by the friction between the segmented carbon seal ring body 3 and the drive shaft during the flow process, reducing the working temperature of the segmented carbon seal ring body 3, slowing down the aging rate of the carbon material, and thus extending the service life of the segmented carbon seal ring body 3.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A coal pulverizer carbon fine seal ring characterized by: Includes a frame plate (1), a groove (2) is provided in the frame plate (1), a multi-part carbon seal ring body (3) is provided in the groove (2), a rib groove (4) is provided on one side of the multi-part carbon seal ring body (3), a rib strip (5) adapted to the rib groove (4) is installed on the other side of the multi-part carbon seal ring body (3), an annular groove (6) is provided on the multi-part carbon seal ring body (3), and a preload spring (7) is provided on the annular groove (6). (1) An mounting plate (8) is installed on the frame plate (1). An air storage chamber (9) is installed inside the mounting plate (8). An air pressure valve (10) is installed on the air storage chamber (9). An air supply pipe (11) is connected to the air storage chamber (9). An annular air supply plate (12) is installed on the frame plate (1). Multiple sets of jet nozzles (13) are arranged on the annular air supply plate (12). A connecting pipe (14) is connected to the air storage chamber (9). One end of the connecting pipe (14) is connected to an electric air pump (15).

2. A coal pulverizer carbon fine seal ring as defined in claim 1 wherein: The preload spring (7) is ring-shaped.

3. A coal pulverizer carbon fine seal ring as defined in claim 1 wherein: The number of the segmented carbon seal ring bodies (3) is eight, and the adjacent two segments of the segmented carbon seal ring bodies (3) are connected by the ribs (5) and the grooves (4).

4. A coal pulverizer carbon fine seal ring as defined in claim 1 wherein: The gas delivery pipe (11) passes through the frame plate (1) and is connected to the annular gas delivery plate (12).

5. A coal pulverizer carbon fine seal ring as defined in claim 1 wherein: A check valve (16) is provided on the connecting pipe (14).

6. A coal pulverizer carbon fine seal ring as defined in claim 1 wherein: The jet head (13) is distributed in a circular shape on the annular gas delivery plate (12).

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