Outer air seal device of medium-speed bowl type coal mill

Abstract

The utility model discloses an outer air seal device of a medium-speed bowl type coal mill, and relates to the technical field of mechanical seal. Comprising a connecting shaft, and a lower frame body and a sealing seat are sequentially arranged on the outer side of the connecting shaft; the sealing assembly is arranged on the outer side of the connecting shaft and used for sealing a gap between the sealing seat and the connecting shaft, the sealing assembly comprises a plurality of connecting pieces, and the connecting pieces are matched to block sealing gas of the connecting shaft; and the fixing mechanism is arranged in the sealing assembly. Through the arrangement of the sealing assembly, the connection blocks, the first fixing blocks, the connection grooves, the positioning grooves, the positioning blocks and the second fixing blocks are matched, so that the spliced connection blocks are positioned, and the situation that in order to ensure that gaps and height differences do not exist between every two adjacent sections of outer air seals, the outer air seals need to be spliced after being spliced is avoided. And repeated adjustment is needed, so that the installation process of the external air seal of the coal mill is tedious.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to an external air seal device for a medium-speed bowl-type coal mill. Background Art

[0002] The medium-speed bowl-type coal mill is an important auxiliary equipment in a thermal power plant. Its operating condition directly affects the safety, stability and economy of the unit. Among them, the coal mill external air seal is a sealing component between the mill bowl and the side body. It can prevent air leakage and powder leakage inside the medium-speed bowl-type coal mill and is a key component of the medium-speed bowl-type coal mill.

[0003] With the long-term operation of the medium-speed bowl-type coal mill, the outer air seal will gradually wear out, so the outer air seal of the coal mill needs to be replaced after a period of time to ensure the normal operation of the coal mill. The outer air seal of the coal mill is usually processed in sections during production. In actual use, multiple sections of the outer air seal need to be spliced ​​and used. When splicing, it is necessary to ensure that there is no gap or height difference between the two adjacent sections of the outer air seal. Therefore, most of the outer air seals need to be repeatedly adjusted after splicing, which makes the installation process of the outer air seal of the coal mill cumbersome. For this reason, an outer air seal device for a medium-speed bowl-type coal mill is proposed. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that most of the external air seals need to be repeatedly adjusted after splicing, which makes the installation process of the external air seal of the coal mill complicated. The utility model provides an external air seal device for a medium-speed bowl-type coal mill to ensure that there is no gap or height difference between two adjacent sections of the external air seals.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0006] An external gas seal device for a medium-speed bowl-type coal mill, comprising:

[0007] A connecting shaft, the outer side of which is provided with a lower frame and a sealing seat in sequence;

[0008] A sealing assembly is arranged outside the connecting shaft and is used to seal the gap between the sealing seat and the connecting shaft. The sealing assembly includes a connecting piece, and the connecting piece is multiple, and the multiple connecting pieces cooperate to block the sealing gas of the connecting shaft;

[0009] The fixing mechanism is arranged inside the sealing component and is used to fix the position of the sealing component. The fixing mechanism includes a control component and a connecting component. The control component is arranged inside the connecting piece, and the connecting component is arranged outside the control component. The control component controls the connecting component to limit the multiple connecting pieces.

[0010] Furthermore, the connecting member includes a connecting block, which is in an arc shape, and a first fixing block and a second fixing block are respectively provided at both ends of the connecting block, and the first fixing block and the second fixing block are staggered on both sides of the connecting block, and the first fixing block is respectively provided with a positioning groove on one side of the second fixing block, and the second fixing block is provided with a positioning block on one side of the first fixing block.

[0011] Furthermore, a connection groove is formed on one side of the first fixing block relative to the second fixing block, and the number of the connection grooves is multiple.

[0012] Furthermore, the control component includes a threaded rod, which is arranged inside the second fixed block. One end of the threaded rod passes through the second fixed block. Both ends of the threaded rod are provided with sliding blocks, and the sliding blocks move relative to the second fixed block. A wedge plate is provided on the outside of the sliding block.

[0013] Furthermore, the connecting assembly includes a connecting rod, there are multiple connecting rods, and the connecting rods correspond to the connecting grooves one by one, the axial line of the connecting rod is perpendicular to the threaded rod, the connecting rod is arranged inside the second fixed block, and the connecting rod slides relative to the second fixed block, a control groove is opened at one end of the connecting rod, and the wedge plate slides inside the control groove, the other end of the connecting rod passes through the second fixed block, and the connecting rod is adapted to the connecting groove, and a connecting disk and a spring are provided on the outside of the connecting rod in sequence.

[0014] Furthermore, the contact end of the connecting rod and the connecting groove is wedge-shaped.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model realizes the positioning of the assembled connecting block through the arrangement of the sealing component through the cooperation of the connecting block, the first fixing block, the connecting groove, the positioning groove, the positioning block and the second fixing block, thereby avoiding the need to repeatedly adjust the external air seal after splicing in order to ensure that there is no gap and height difference between two adjacent sections of the external air seal, thereby avoiding the cumbersome installation process of the external air seal of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 This is an enlarged view of the sealing component of the utility model;

[0019] Figure 3 This is an enlarged view of the first fixing block of the utility model;

[0020] Figure 4 This is an enlarged view of the positioning block of the utility model;

[0021] Figure 5This is a main sectional view of the connection block of the utility model;

[0022] Figure 6 It is an enlarged view of the control component of the utility model;

[0023] Figure 7 It is a partial cross-sectional view of the connection groove of the utility model;

[0024] Figure numerals: 1, connecting shaft; 101, lower frame; 102, sealing seat; 3, sealing assembly; 301, connecting block; 302, first fixed block; 303, connecting groove; 304, positioning groove; 305, positioning block; 306, second fixed block; 4, control assembly; 401, threaded rod; 402, sliding block; 403, wedge plate; 5, connecting assembly; 501, connecting rod; 502, control groove; 503, connecting disk; 504, spring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 7 As shown, an external gas sealing device for a medium-speed bowl-type coal mill comprises: a connecting shaft 1, on the outer side of which a lower frame 101 and a sealing seat 102 are sequentially arranged; a sealing assembly 3, arranged on the outer side of the connecting shaft 1, for sealing the gap between the sealing seat 102 and the connecting shaft 1, the sealing assembly 3 comprises a connecting piece, there are a plurality of connecting pieces, and the plurality of connecting pieces cooperate to block the sealing gas of the connecting shaft 1; a fixing mechanism, arranged inside the sealing assembly 3, for fixing the position of the sealing assembly 3, the fixing mechanism comprises a control assembly 4 and a connecting assembly 5, the control assembly 4 is arranged on Inside the connecting piece, the connecting component 5 is arranged on the outside of the control component 4, and the control component 4 controls the connecting component 5 to limit the multiple connecting pieces. Specifically, during the use of the coal mill, the sealing seat 102 and the sealing component 3 cooperate to block the coal powder in the grinding process to prevent the coal powder from leaking through the gap between the lower frame 101 and the connecting shaft 1, thereby causing pollution to the production environment. During the installation of the sealing component 3, the assembled connecting piece is positioned through the cooperation of the control component 4 and the connecting component 5 to ensure the sealing effect of the assembled connecting piece.

[0031] More specifically, the two ends of the connecting shaft 1 are respectively connected to the coal grinding bowl and the transmission box, and the sealing seat 102 fixes the position of the sealing component 3 to prevent the sealing component 3 from being displaced relative to the connecting shaft 1 during use. The sealing seat 102 protects the sealing component 3 to prevent the sealing component 3 from being displaced due to force during use, thereby affecting the sealing effect.

[0032] like Figures 1 to 7As shown, the connecting piece includes a connecting block 301, which is in an arc shape. A first fixing block 302 and a second fixing block 306 are respectively provided at both ends of the connecting block 301, and the first fixing block 302 and the second fixing block 306 are staggered on both sides of the connecting block 301. The first fixing block 302 is respectively provided with a positioning groove 304 on one side relative to the second fixing block 306, and the second fixing block 306 is provided with a positioning block 305 on one side relative to the first fixing block 302. Specifically, the interior of the connecting block 301 is in an arc shape, so that it can be tightly attached to the connecting shaft 1 when in use. After the multiple connecting blocks 301 are assembled and connected, the outer side of the connecting shaft 1 can be wrapped, thereby improving the convenience of installation of the connecting block 301. The two sides of the connecting block 301 refer to the surfaces distributed in the height direction of the connecting block 301, so that the assembly positions between the connecting blocks 301 are fixed during the assembly of the multiple connecting blocks 301, so as to avoid the situation where steps appear on the sides of the connecting blocks 301 after assembly. The positioning block 305 cooperates with the positioning groove 304 to guide the position of the connecting block 301 to avoid the occurrence of steps on the inner wall of the connecting block 301 after assembly. When assembling the connecting block 301, the adjacent connecting blocks 301 are connected in sequence through the cooperation of the positioning groove 304 and the positioning block 305, so that the connecting block 301 can be installed on the outside of the connecting shaft 1. In the process of connecting multiple connecting blocks 301, the second fixing block 306, the first fixing block 302 and the positioning groove 304, and the positioning block 305 cooperate to position the connecting block 301 during the connection process to avoid the occurrence of steps after assembly and the occurrence of poor sealing effect. The positioning block 305 has the same shape as the positioning groove 304. The positioning block 305 can be in the shape of a T-shaped strip or a dovetail strip, so as to guide the connecting block 301 while limiting the adjacent connecting blocks 301 to avoid the positioning block 305 directly sliding out of the positioning groove 304 during use.

[0033] like Figures 1 to 7 As shown, a connecting groove 303 is further provided on one side of the first fixing block 302 relative to the second fixing block 306, and there are multiple connecting grooves 303. Specifically, the connecting grooves 303 cooperate with the connecting assembly 5 to limit the adjacent connecting blocks 301 during use to avoid relative movement of adjacent connecting grooves 303 during use, thereby causing air to leak from the gaps between the connecting blocks 301. The inner wall of the connecting groove 303 is inclined, and the shape of the connecting groove 303 can be a cylindrical groove or a quadrilateral column groove, etc.

[0034] like Figures 1 to 7As shown, the control component 4 includes a threaded rod 401, which is arranged inside the second fixed block 306, one end of the threaded rod 401 passes through the second fixed block 306, and sliding blocks 402 are provided at both ends of the threaded rod 401, and the sliding blocks 402 move relative to the second fixed block 306, and wedge plates 403 are provided on the outside of the sliding blocks 402. Specifically, left-handed threads and right-handed threads are provided at both ends of the threaded rod 401, respectively, so that during the rotation of the threaded rod 401, the left-handed threads and the right-handed threads cooperate to drive the sliding blocks 402 to move toward or in the opposite direction, and the two ends of the threaded rod 401 point to the arc-shaped inner wall and the arc-shaped outer wall of the connecting block 301, respectively, and the axis of the threaded rod 401 is parallel to the width of the connecting block 301. The wedge plates 403 on both sides are wedge-shaped at the bottom, and the wedge-shaped surfaces of the wedge plates 403 on both sides are in opposite directions. The threaded rod 401 passes through the end of the connecting block 301 and is provided with a sealing groove. The sealing groove can be a hexagonal groove matched with an inner hexagonal wrench or a hexagonal plum blossom groove matched with an inner hexagonal plum wrench. After the connecting block 301 is assembled, the threaded rod 401 is first used to cooperate with the sliding block 402 to drive the wedge plate 403 to move in the opposite direction. During the reverse movement of the wedge plate 403, the connecting component 5 is gradually pushed into the connecting groove 303 through the wedge surface, thereby connecting the adjacent connecting blocks 301 to avoid relative movement between the adjacent connecting blocks 301 during use, thereby ensuring the sealing effect of the connecting shaft 1.

[0035] like Figures 1 to 7 As shown, the connection assembly 5 includes a connection rod 501, and there are multiple connection rods 501, and the connection rods 501 correspond to the connection grooves 303 one by one. The axis of the connection rod 501 is perpendicular to the threaded rod 401, and the connection rod 501 is arranged inside the second fixed block 306, and the connection rod 501 slides relative to the second fixed block 306. A control groove 502 is opened at one end of the connection rod 501, and the wedge plate 403 slides inside the control groove 502. The other end of the connection rod 501 passes through the second fixed block 306, and the connection rod 501 is adapted to the connection groove 303. A connection disk 503 and a spring 504 are sequentially arranged on the outside of the connection rod 501. Specifically, the wedge plate 403 gradually fits with the control groove 502 during the reverse movement. While the wedge plate 403 fits with the control groove 502, the wedge plate 403 pushes the connecting rod 501 downward to insert into the connecting groove 303, thereby fixing the position of the assembled connecting block 301. The spring 504 cooperates with the connecting plate 503 to provide a pulling force to the connecting rod 501, so that the connecting rod 501 can be lifted during the assembly and disassembly process to avoid the second fixing block 306 extending out during assembly and disassembly from interfering with the first fixing block 302. The shape of the connecting rod 501 can be cylindrical or quadrilateral.

[0036] like Figures 1 to 7As shown, the contact end of the connecting rod 501 and the connecting groove 303 is wedge-shaped. Specifically, the wedge-shaped surface of the connecting rod 501 faces the open end of the positioning groove 304, so that when the connecting rod 501 is inserted into the connecting groove 303, opposite pulling forces are applied to the adjacent connecting blocks 301, further ensuring the stability of the connection after the connecting blocks 301 are assembled.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An external gas seal device for a medium-speed bowl-type coal mill, characterized in that: include: A connecting shaft (1), wherein a lower frame (101) and a sealing seat (102) are sequentially arranged on the outer side of the connecting shaft (1); A sealing assembly (3) is arranged on the outside of the connecting shaft (1) and is used to seal the gap between the sealing seat (102) and the connecting shaft (1), the sealing assembly (3) comprising a connecting piece, the connecting piece being multiple, and the multiple connecting pieces cooperate to block the sealing gas of the connecting shaft (1); A fixing mechanism is arranged inside the sealing component (3) and is used to fix the position of the sealing component (3). The fixing mechanism comprises a control component (4) and a connecting component (5). The control component (4) is arranged inside the connecting piece, and the connecting component (5) is arranged outside the control component (4). The control component (4) controls the connecting component (5) to limit the position of the plurality of connecting pieces.

2. The external gas seal device for a medium-speed bowl-type coal mill according to claim 1, characterized in that: The connecting piece comprises a connecting block (301), the connecting block (301) is in an arc shape, a first fixing block (302) and a second fixing block (306) are respectively arranged at two ends of the connecting block (301), and the first fixing block (302) and the second fixing block (306) are staggeredly arranged on both sides of the connecting block (301), a positioning groove (304) is respectively provided on one side of the first fixing block (302) relative to the second fixing block (306), and a positioning block (305) is provided on one side of the second fixing block (306) relative to the first fixing block (302).

3. The external gas seal device for a medium-speed bowl-type coal mill according to claim 2, characterized in that: A connection groove (303) is also provided on one side of the first fixing block (302) relative to the second fixing block (306), and there are a plurality of the connection grooves (303).

4. The external gas seal device for a medium-speed bowl-type coal mill according to claim 2, characterized in that: The control assembly (4) comprises a threaded rod (401), wherein the threaded rod (401) is arranged inside the second fixed block (306), one end of the threaded rod (401) passes through the second fixed block (306), sliding blocks (402) are provided at both ends of the threaded rod (401), and the sliding blocks (402) move relative to the second fixed block (306), and wedge plates (403) are provided on the outer sides of the sliding blocks (402).

5. The external gas seal device for a medium-speed bowl-type coal mill according to claim 2, characterized in that: The connecting assembly (5) comprises a connecting rod (501), wherein there are a plurality of connecting rods (501), and the connecting rods (501) correspond to the connecting grooves (303) one by one. The axis of the connecting rod (501) is perpendicular to the threaded rod (401), and the connecting rod (501) is arranged inside the second fixed block (306), and the connecting rod (501) slides relative to the second fixed block (306). A control groove (502) is provided at one end of the connecting rod (501), and the wedge plate (403) slides inside the control groove (502). The other end of the connecting rod (501) passes through the second fixed block (306), and the connecting rod (501) is adapted to the connecting groove (303). A connecting disk (503) and a spring (504) are provided on the outside of the connecting rod (501) in sequence.

6. The external gas seal device for a medium-speed bowl-type coal mill according to claim 5, characterized in that: The contact end of the connecting rod (501) and the connecting groove (303) is wedge-shaped.

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