Special mechanical seal for drying machine

Abstract

The invention discloses a special mechanical seal for a drying machine, which relates to the field of mechanical seals and comprises a first external pipe fitting and a second external pipe fitting, a displacement moving part is arranged in the first external pipe fitting, and a position measuring compensation part connected with an L-shaped limiting plate is arranged at one end, far away from a second disc, of a limiting guide rod. By arranging the position measuring compensation piece, a limiting guide rod drives a first piston rod to move through a connecting plate, so that an aqueous solution in a first piston barrel enters a second piston barrel through a flow guide pipe, and a rotating ring drives a positioning ring to horizontally move; at the moment, the moving length of the movable ring driven by the telescopic spring can be clearly obtained by observing the length of the position measuring rod extending out of the L-shaped limiting plate, so that the abrasion degree of the movable ring is obtained, when the positioning ring is attached to one side of the top of the L-shaped limiting plate, it is indicated that the telescopic spring is completely restored, and therefore the static ring and the movable ring can be replaced in time; therefore, the situation that the overall sealing performance of equipment is affected due to the large abrasion degree of the static ring or the movable ring is prevented.

Description

Technical Field

[0001] The invention relates to the field of mechanical seals, in particular to a special mechanical seal for a dryer. Background Art

[0002] A mechanical seal is a device used to solve the sealing problem between a rotating shaft and a machine body. It relies on elastic elements to pre-tighten the dynamic and static ring end face sealing pairs to achieve an axial end face sealing device with sealing, so it is also called an end face seal. The basic elements that constitute a mechanical seal are: a planar end face sealing pair composed of a dynamic ring and a static ring, elastic elements, auxiliary seals, transmission parts, anti-rotation parts and fasteners. Among them, the elastic element mainly plays a role in pre-tightening, compensation and buffering. It is required to always maintain sufficient elasticity to overcome the friction of the auxiliary seals and transmission parts and the inertia of the dynamic ring, etc., to ensure the good fit of the end face seal and the tracking of the dynamic ring.

[0003] However, as the dynamic ring and the static ring are used, friction will occur between them. Although sealing compensation is performed through elastic elements, the degree of wear of the mechanical seal cannot be observed due to the sealing of the equipment, resulting in the inability to replace the dynamic ring and the static ring in time, thus affecting the working effect of the equipment. Summary of the invention

[0004] The object of the present invention is to provide a mechanical seal dedicated to a dryer in order to solve the problem that the wear degree of the mechanical seal cannot be observed.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical seal dedicated to a dryer, comprising a first external pipe fitting, a second external pipe fitting is installed at one end of the first external pipe fitting, an L-shaped limit plate is installed on the outer wall of one end of the second external pipe fitting, a dynamic ring is arranged inside the first external pipe fitting, a second sealing ring and a first sealing ring in contact with the first external pipe fitting are arranged on the outer side of the dynamic ring, a shifting movable part is arranged inside the second external pipe fitting, a static ring is connected to the interior of the second external pipe fitting through the shifting movable part, a second disc is fixedly connected to one end of the dynamic ring, a limit guide rod is installed at one end of the second disc, a first disc is installed inside the first external pipe fitting, a telescopic spring located on the outer side of the limit guide rod is arranged between the first disc and the second disc, and a positioning compensation part connected to the L-shaped limit plate is arranged at one end of the limit guide rod away from the second disc.

[0006] As a further solution of the present invention: the positioning compensation component includes a first piston cylinder installed inside the first external tube component, a first piston rod extending to the outside of the first piston cylinder is inserted into the interior of the first piston cylinder, one end of the first piston rod is connected to a connecting plate, the first piston rod and the limiting guide rod are connected via the connecting plate, the first piston cylinder is provided with a guide tube extending to the outside of the first external tube component, one end of the guide tube is installed with a second piston cylinder, a second piston rod is inserted into the interior of the second piston cylinder, a rotating ring is installed at one end of the second piston rod away from the second piston cylinder, a positioning ring is rotatably connected to one side of the rotating ring via a bearing, and a positioning rod passing through the L-shaped limiting plate is provided at one end of the positioning ring away from the rotating ring.

[0007] As a further solution of the present invention: the internal volumes of the first piston cylinder and the second piston cylinder are equal, and the inner wall diameter of the first piston cylinder is larger than the inner wall diameter of the second piston cylinder.

[0008] As a further solution of the present invention: a through hole having a diameter equal to that of the limiting guide rod is formed on the first disc.

[0009] As a further solution of the present invention: there are multiple first piston cylinders, and the multiple first piston cylinders are equidistantly distributed along the center of the first external tube, and the rotating ring is coaxial with the center of the first external tube.

[0010] As a further solution of the present invention: the shifting movable part includes a connecting groove installed on the inner wall of the second external pipe part, a partition is installed on the inner side of the connecting groove, a rectangular plug rod extending to the bottom of the partition is inserted on the top of the partition, an arc-shaped connecting plate is installed on the bottom end of the rectangular plug rod, a sealing cover located on the outside of the rectangular plug rod is provided on the top of the arc-shaped connecting plate, a return spring located on the inner side of the sealing cover and connected to the partition is installed on the top of the arc-shaped connecting plate, an inclined plate is provided on the top of the rectangular plug rod, a guide rail is provided on the inner side of the inclined plate, an L-shaped connecting rod is installed on the inner wall of one end of the static ring close to the dynamic ring, a connecting pin is provided on the inner side of the L-shaped connecting rod, and the connecting pin is slidably connected to the inclined plate through the guide rail.

[0011] As a further solution of the present invention: the diameter of the connecting pin is equal to the width of the guide rail, and the angle between the partition plate and the inclined plate is thirty degrees.

[0012] As a further solution of the present invention: the partition is provided with a through hole that fits with the rectangular insertion rod.

[0013] As a further solution of the present invention: the length and width of the inner wall of the sealing cover are both greater than the length and width of the rectangular plug rod.

[0014] As a further solution of the present invention: the bottom of the arc-shaped connecting plate is an arc-shaped structure, and the four sides of the arc-shaped connecting plate are in a fit state with the connecting groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the positioning compensation part, the limiting guide rod drives the first piston rod to move through the connecting plate, so that the aqueous solution inside the first piston cylinder enters the second piston cylinder through the guide tube, so that the rotating ring drives the positioning ring to move horizontally, so that the positioning rod can move relative to the L-shaped limiting plate. At this time, by observing the length of the positioning rod extending out of the L-shaped limiting plate, the moving length of the moving ring driven by the telescopic spring can be clearly obtained, so as to obtain the wear degree of the moving ring. When the positioning ring fits with the top side of the L-shaped limiting plate, it means that the telescopic spring is completely restored. At this time, the static ring and the dynamic ring need to be replaced. In this way, the static ring and the dynamic ring can be replaced in time, so as to prevent the overall sealing of the equipment from being affected by the large wear degree of the static ring or the dynamic ring; 2. By setting a shifting movable part, when the second external pipe is installed on the outside of the connecting shaft, the arc connecting plate is squeezed by the connecting shaft to move along the connecting groove, so that the rectangular plug rod is moved in the direction away from the center of the static ring. In this process, the reset spring contracts, and the connecting pin moves toward the dynamic ring under the guidance of the guide rail. In this way, the connecting pin can drive the static ring toward the dynamic ring through the L-shaped connecting rod, so that the static ring squeezes the dynamic ring and the telescopic spring contracts. After that, the telescopic spring can use the elastic restoring force to keep the static ring and the dynamic ring in a fitting state at all times. At the same time, the telescopic spring is in a normal state when the equipment is not put into use, so as to prevent the telescopic spring from being in a compressed state for a long time and causing elastic fatigue, thereby further increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the connection between the limiting guide rod and the first piston cylinder of the present invention; Figure 4 It is a schematic diagram of the connection between the rotating ring and the flow guide pipe of the present invention; Figure 5 It is a schematic diagram of the internal structure of the second piston cylinder of the present invention; Figure 6 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 2 Enlarged view of point B in the middle; Figure 8 It is a schematic diagram of the connection between the arc-shaped connecting plate and the L-shaped connecting rod of the present invention.

[0017] In the figure: 1. first external pipe fitting; 2. second external pipe fitting; 3. L-shaped limit plate; 4. positioning rod; 5. positioning ring; 6. rotating ring; 7. static ring; 8. dynamic ring; 9. limit guide rod; 10. connecting plate; 11. first piston rod; 12. first piston cylinder; 13. guide tube; 14. second piston cylinder; 15. second piston rod; 16. first disc; 17. telescopic spring; 18. second disc; 19. first sealing ring; 20. second sealing ring; 21. connecting groove; 22. partition; 23. arc-shaped connecting plate; 24. sealing cover; 25. reset spring; 26. L-shaped connecting rod; 27. tilting plate; 28. connecting pin; 29. ​​guide rail; 30. rectangular plug rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of 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. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0020] Example 1 See also Figures 1 to 8In an embodiment of the present invention, a mechanical seal dedicated to a dryer comprises a first external pipe fitting 1, a second external pipe fitting 2 is installed at one end of the first external pipe fitting 1, an L-shaped limit plate 3 is installed on the outer wall of one end of the second external pipe fitting 2, a dynamic ring 8 is arranged inside the first external pipe fitting 1, a second sealing ring 20 and a first sealing ring 19 in contact with the first external pipe fitting 1 are arranged on the outer side of the dynamic ring 8, a shift movable part is arranged inside the second external pipe fitting 2, a static ring 7 is connected to the inside of the second external pipe fitting 2 through the shift movable part, a second disc 18 is fixedly connected to one end of the dynamic ring 8, a limit guide rod 9 is installed at one end of the second disc 18, a first disc 16 is installed inside the first external pipe fitting 1, a telescopic spring 17 located outside the limit guide rod 9 is arranged between the first disc 16 and the second disc 18, and a positioning compensation part connected to the L-shaped limit plate 3 is arranged at one end of the limit guide rod 9 away from the second disc 18.

[0021] In this embodiment, when the equipment is put into use, the displacement movable part is operated through the connection between the pipe fitting and the second external pipe fitting 2, so that the static ring 7 and the dynamic ring 8 are fully in contact, and the telescopic spring 17 is contracted at the same time. When the dynamic ring 8 rotates relative to the static ring 7, a certain wear will occur on its end face. In this process, the dynamic ring 8 is driven to move toward the static ring 7 under the action of the elastic restoring force of the telescopic spring 17, so as to realize the sealing compensation between the static ring 7 and the dynamic ring 8, so that the static ring 7 and the dynamic ring 8 are always in a fitting state. At this time, the longer the distance that the telescopic spring 17 pushes the dynamic ring 8 to move, the greater the wear of the static ring 7 and the dynamic ring 8. At this time, the positioning compensation part can be used to observe the moving distance of the dynamic ring 8 pushed by the telescopic spring 17, so that the degree of wear between the static ring 7 and the dynamic ring 8 can be clearly obtained.

[0022] Example 2 Please refer to Figure 1 to Figure 6 The positioning compensation component includes a first piston cylinder 12 installed inside the first external pipe 1, a first piston rod 11 extending to the outside of the first piston cylinder 12 is inserted inside the first piston cylinder 12, one end of the first piston rod 11 is connected to a connecting plate 10, the first piston rod 11 and the limiting guide rod 9 are connected through the connecting plate 10, a guide tube 13 extending to the outside of the first external pipe 1 is arranged on the first piston cylinder 12, a second piston cylinder 14 is installed at one end of the guide tube 13, a second piston rod 15 is inserted inside the second piston cylinder 14, a rotating ring 6 is installed at one end of the second piston rod 15 away from the second piston cylinder 14, a positioning ring 5 is rotatably connected to one side of the rotating ring 6 through a bearing, and a positioning rod 4 penetrating the L-shaped limiting plate 3 is arranged at one end of the positioning ring 5 away from the rotating ring 6; The internal volumes of the first piston cylinder 12 and the second piston cylinder 14 are equal, and the inner wall diameter of the first piston cylinder 12 is larger than the inner wall diameter of the second piston cylinder 14. By setting this structure, when the aqueous solution in the first piston cylinder 12 enters the second piston cylinder 14, the moving distance of the second piston rod 15 is larger than the moving distance of the first piston rod 11. In this way, it can be clearly determined whether the static ring 7 and the dynamic ring 8 are in a state of needing replacement according to the moving distance of the second piston rod 15. The first disc 16 is provided with a through hole having a diameter equal to that of the limiting guide rod 9. This structure is provided to guide the limiting guide rod 9, thereby preventing radial movement between the static ring 7 and the dynamic ring 8 when the device vibrates, further improving the docking accuracy of the static ring 7 and the dynamic ring 8. There are multiple first piston cylinders 12 , and the multiple first piston cylinders 12 are equidistantly distributed along the center of the first external tube 1 . The rotating ring 6 is coaxial with the center of the first external tube 1 . This structure is used to provide stable support for the rotating ring 6 .

[0023] In this embodiment, when the static ring 7 and the dynamic ring 8 are damaged due to friction, the telescopic spring 17 will push the dynamic ring 8 to move, so as to maintain the seal between the static ring 7 and the dynamic ring 8. During this process, the limiting guide rod 9 will move synchronously with the movement of the dynamic ring 8, so that the limiting guide rod 9 drives the first piston rod 11 to move through the connecting plate 10. During the movement of the first piston rod 11, the aqueous solution inside the first piston cylinder 12 is squeezed so that the aqueous solution inside the first piston cylinder 12 enters the second piston cylinder 14 through the guide tube 13, so that the second piston rod 15 moves away from the second piston cylinder 14. When the positioning ring 5 is in contact with the top side of the L-shaped limit plate 3, the telescopic spring 17 can be used to restore the static ring 7 and the dynamic ring 8 can be replaced. In this way, the static ring 7 and the dynamic ring 8 can be replaced in time to prevent the static ring 7 or the dynamic ring 8 from being affected by the large degree of wear.

[0024] Example 3 Please refer to Figure 1 , Figure 2 , Figure 7 , Figure 8The shifting movable part includes a connecting groove 21 installed on the inner wall of the second external pipe member 2, a partition 22 is installed on the inner side of the connecting groove 21, a rectangular plug rod 30 extending to the bottom of the partition 22 is inserted on the top of the partition 22, an arc-shaped connecting plate 23 is installed on the bottom end of the rectangular plug rod 30, a sealing cover 24 located on the outside of the rectangular plug rod 30 is arranged on the top of the arc-shaped connecting plate 23, a return spring 25 located on the inner side of the sealing cover 24 and connected to the partition 22 is installed on the top of the arc-shaped connecting plate 23, an inclined plate 27 is arranged on the top of the rectangular plug rod 30, a guide rail 29 is opened on the inner side of the inclined plate 27, an L-shaped connecting rod 26 is installed on the inner wall of one end of the static ring 7 close to the dynamic ring 8, a connecting pin 28 is arranged on the inner side of the L-shaped connecting rod 26, and the connecting pin 28 is slidably connected with the inclined plate 27 through the guide rail 29; The diameter of the connecting pin 28 is equal to the width of the guide rail 29, and the angle between the partition plate 22 and the inclined plate 27 is thirty degrees. By setting this structure, the inclined plate 27 moves horizontally when the rectangular plug rod 30 moves, thereby achieving stable movement of the stationary ring 7; The partition plate 22 is provided with a through hole that fits with the rectangular plug rod 30. This structure is provided to provide a movable space for the movement of the rectangular plug rod 30. The length and width of the inner wall of the sealing cover 24 are greater than the length and width of the rectangular plug rod 30. By setting this structure, when the arc connecting plate 23 moves upward, the top of the sealing cover 24 and the connection between the partition plate 22 and the rectangular plug rod 30 are shielded and sealed; The bottom of the arc connecting plate 23 is an arc-shaped structure, and the four sides of the arc connecting plate 23 are in a fit state with the connecting groove 21. By setting this structure, when the external shaft is inserted into the second external pipe 2, the arc connecting plate 23 is squeezed by the arc surface at the bottom of the arc connecting plate 23, so that the arc connecting plate 23 can move stably.

[0025] In this embodiment, when the second external pipe 2 is installed on the outside of the connecting shaft, the arc connecting plate 23 is squeezed by the connecting shaft so that the arc connecting plate 23 moves along the connecting groove 21, so that the rectangular plug rod 30 moves in a direction away from the center of the stationary ring 7. During this process, the reset spring 25 contracts, and the connecting pin 28 moves toward the dynamic ring 8 under the guidance of the guide rail 29. In this way, the connecting pin 28 can drive the static ring 7 to move toward the dynamic ring 8 through the L-shaped connecting rod 26, so that the static ring 7 squeezes the dynamic ring 8 and the telescopic spring 17 contracts. After that, the telescopic spring 17 can use the elastic restoring force to keep the static ring 7 and the dynamic ring 8 in a fit state at all times, and at the same time, the telescopic spring 17 is in a normal state when the equipment is not put into use, so as to prevent the telescopic spring 17 from being in a compressed state for a long time and causing elastic fatigue, thereby further increasing the service life of the equipment.

[0026] What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanical seal for a dryer, comprising a first external pipe member (1), characterized in that: A second external pipe member (2) is installed at one end of the first external pipe member (1); an L-shaped limit plate (3) is installed on the outer wall of one end of the second external pipe member (2); a moving ring (8) is arranged inside the first external pipe member (1); a second sealing ring (20) and a first sealing ring (19) in contact with the first external pipe member (1) are arranged on the outer side of the moving ring (8); a shifting movable part is arranged inside the second external pipe member (2); and the inside of the second external pipe member (2) is connected to the outer wall of the second external pipe member (2) by the shifting movable part. A static ring (7) is connected, one end of the dynamic ring (8) is fixedly connected to a second disc (18), one end of the second disc (18) is installed with a limiting guide rod (9), a first disc (16) is installed inside the first external pipe (1), a telescopic spring (17) is arranged between the first disc (16) and the second disc (18) and is located outside the limiting guide rod (9), and one end of the limiting guide rod (9) away from the second disc (18) is provided with a positioning compensation component connected to the L-shaped limiting plate (3).

2. A mechanical seal for a dryer according to claim 1, characterized in that: The positioning compensation component comprises a first piston cylinder (12) installed inside a first external pipe member (1), a first piston rod (11) extending to the outside of the first piston cylinder (12) is inserted into the inside of the first piston cylinder (12), one end of the first piston rod (11) is connected to a connecting plate (10), the first piston rod (11) and the limiting guide rod (9) are connected via the connecting plate (10), a guide tube (13) extending to the outside of the first external pipe member (1) is provided on the first piston cylinder (12), a second piston cylinder (14) is installed at one end of the guide tube (13), a second piston rod (15) is inserted into the inside of the second piston cylinder (14), a rotating ring (6) is installed at one end of the second piston rod (15) away from the second piston cylinder (14), a positioning ring (5) is rotatably connected to one side of the rotating ring (6) via a bearing, and a positioning rod (4) penetrating the L-shaped limiting plate (3) is provided at one end of the positioning ring (5) away from the rotating ring (6).

3. A mechanical seal for a dryer according to claim 2, characterized in that: The internal volumes of the first piston cylinder (12) and the second piston cylinder (14) are equal in size, and the inner wall diameter of the first piston cylinder (12) is greater than the inner wall diameter of the second piston cylinder (14).

4. A mechanical seal for a dryer according to claim 2, characterized in that: The first disc (16) is provided with a through hole having a diameter equal to that of the limiting guide rod (9).

5. A mechanical seal for a dryer according to claim 2, characterized in that: The number of the first piston cylinders (12) is multiple, and the multiple first piston cylinders (12) are distributed at equal distances along the center of the first external tube (1), and the rotating ring (6) is coaxial with the center of the first external tube (1).

6. A mechanical seal for a dryer according to claim 2, characterized in that: The movable displacement member comprises a connection groove (21) mounted on the inner wall of the second external pipe member (2); a partition plate (22) is mounted on the inner side of the connection groove (21); a rectangular plug rod (30) extending to the bottom of the partition plate (22) is plugged into the top of the partition plate (22); an arc-shaped connecting plate (23) is mounted on the bottom end of the rectangular plug rod (30); a sealing cover (24) located outside the rectangular plug rod (30) is arranged on the top of the arc-shaped connecting plate (23); and the top of the arc-shaped connecting plate (23) is provided with a sealing cover (24) located outside the rectangular plug rod (30). A return spring (25) is installed on the inner side of the sealing cover (24) and connected to the partition (22); an inclined plate (27) is arranged on the top of the rectangular plug rod (30); a guide rail (29) is provided on the inner side of the inclined plate (27); an L-shaped connecting rod (26) is installed on the inner wall of one end of the static ring (7) close to the dynamic ring (8); a connecting pin (28) is arranged on the inner side of the L-shaped connecting rod (26); and the connecting pin (28) is slidably connected to the inclined plate (27) through the guide rail (29).

7. A mechanical seal for a dryer according to claim 6, characterized in that: The diameter of the connecting pin (28) is equal to the width of the guide rail (29), and the angle between the partition plate (22) and the inclined plate (27) is thirty degrees.

8. A mechanical seal for a dryer according to claim 6, characterized in that: The partition plate (22) is provided with a through hole which fits with the rectangular insertion rod (30).

9. A mechanical seal for a dryer according to claim 6, characterized in that: The length and width of the inner wall of the sealing cover (24) are both greater than the length and width of the rectangular insertion rod (30).

10. A mechanical seal for a dryer according to claim 6, characterized in that: The bottom of the arc-shaped connecting plate (23) is an arc-shaped structure, and the four sides of the arc-shaped connecting plate (23) are in a fitted state with the connecting groove (21).

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