A stirring shaft sealing structure

Abstract

This utility model discloses a sealing structure for a stirring shaft, used to form a seal between a rotating shaft and a base plate. It includes: a primary sealing assembly comprising a dynamic seal that rotates with the shaft and a fixed seal that is fixed to the base plate, forming a primary seal; a secondary sealing assembly disposed inside the primary sealing assembly, forming a secondary seal; and a clamping assembly comprising a clamping ring, the clamping ring having a clamping portion for axially clamping the secondary sealing assembly, and the clamping ring also having an elastic component to press the clamping ring against the secondary sealing assembly. The advantage of this utility model is that by setting up the primary and secondary sealing assemblies, the sealing function is guaranteed. Simultaneously, the clamping assembly presses the secondary sealing assembly, ensuring that the end face of the clamping ring contacts the secondary sealing assembly to achieve a complete seal, so that radial eccentricity of the rotating shaft does not affect the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a sealing structure for a stirring shaft. Background Technology

[0002] In mining production, large mixers are mainly used in key stages such as slurry mixing, reagent mixing, and material pretreatment. Based on function and application, they can be categorized into mining mixing tanks, concrete mixers, and multi-functional mixing equipment. Their core function is to improve mineral separation efficiency or meet engineering construction needs through efficient mixing, and they are widely used in the mining and processing of metal, coal, and non-metallic minerals. They feature a mixing shaft, which is typically 6 meters or longer. Since the mixing shaft cannot be machined as a single piece, current technologies, such as... Figure 4 As shown, the shaft head and sealing part are welded after machining. Packing is placed in the sealing seat. A in the figure shows the packing. The packing is pressed by the pressure plate. However, this structure cannot guarantee the coaxiality of the sealing part and the rotating agitator shaft. The packing seal is squeezed outward under the rotation of the eccentric circle. The gap becomes larger and larger, causing the seal to fail quickly. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a stirring shaft sealing structure, which then employs a mechanical seal device with multiple springs for end-face contact friction to achieve a complete seal. Due to the spring compression, the sealing surface remains in conformal contact. This end-face contact seal is unaffected by radial eccentricity or coaxiality.

[0004] Specifically, this utility model discloses a stirring shaft sealing structure for forming a seal between the rotating shaft and the seat plate, comprising:

[0005] The primary sealing assembly includes a dynamic seal that rotates with the shaft and a fixed seal that is fixed to the seat plate, forming a primary seal;

[0006] A secondary sealing assembly is disposed inside the primary sealing assembly to form a secondary seal;

[0007] A clamping assembly includes a clamping ring for axially clamping the secondary sealing assembly, and the clamping ring is further provided with an elastic component to clamp the clamping ring and the secondary sealing assembly.

[0008] The advantage of adopting the above technical solution is that by setting a primary sealing component and a secondary sealing component, the sealing function is guaranteed. At the same time, a clamping component is set to press the secondary sealing component, so that the end face of the clamping ring contacts the secondary sealing component to achieve complete sealing, and the radial eccentricity of the rotating shaft will not affect the sealing performance.

[0009] Furthermore, the elastic component includes a spring, a guide post, and a fixing nut. The spring is sleeved on the guide post, the fixing nut is disposed on the guide post, the guide post passes through the compression ring, and its end is fixed to the sealing element.

[0010] The advantage of adopting the above technical solution is that the spring and guide post always provide clamping force to the secondary sealing assembly, ensuring the sealing performance of the secondary sealing assembly, and also ensuring that the secondary sealing assembly is pressed against the primary sealing element, thus ensuring the overall sealing performance.

[0011] Furthermore, a sealing ring is provided between the clamping ring and the fixed sealing element.

[0012] The advantage of adopting the above technical solution is that the sealing ring ensures a seal between the compression ring and the fixed seal, thus ensuring the overall sealing performance.

[0013] Furthermore, the secondary sealing assembly includes friction plates arranged side by side, one side of which contacts the dynamic seal, and the other side is pressed by a clamping ring.

[0014] The advantages of adopting the above technical solution are that the friction plate and the dynamic seal directly contact to form a sealing surface. By arranging them side by side, the sealing area can be increased and the sealing effect can be improved. At the same time, the axial pressure of the clamping ring can ensure that the friction plate is always in close contact with the dynamic seal. Even after slight wear occurs after long-term use, it can still maintain good sealing performance under the action of the clamping assembly. In addition, even if the shaft moves radially, the inner side of the friction plate still has good contact with the shaft under the action of the clamping assembly.

[0015] Furthermore, the primary sealing assembly also includes a retaining ring located outside the dynamic seal, which is used to fix the dynamic seal to the rotating shaft.

[0016] The advantage of adopting the above technical solution is that the retaining ring fixes the dynamic seal to the rotating shaft, ensuring that the dynamic seal will not have axial displacement when it rotates synchronously with the rotating shaft, thereby ensuring the stability and reliability of the primary seal and avoiding seal failure due to loosening of the dynamic seal.

[0017] Furthermore, the dynamic seal is provided with an mounting portion and an extension portion, the extension portion extending outward, and the fixed seal is provided with a groove for accommodating the extension portion, the extension portion extending into the groove.

[0018] The advantage of adopting the above technical solution is that the cooperation between the protrusion and the groove forms a structure similar to a labyrinth seal, which can increase the resistance to media leakage, further improve the sealing effect, and effectively prevent external impurities from entering or internal media from leaking out.

[0019] Furthermore, the sealing element is fixed to the seat plate by a locking element.

[0020] The advantage of adopting the above technical solution is that the locking component fixes the seat plate and the fixed seal, thus fixing the position of the fixed seal and preventing it from shifting due to equipment vibration, ensuring the sealing effect and providing a reliable fixed foundation for the overall sealing structure.

[0021] Furthermore, there are two fixing nuts, the end of the guide post has external threads, and a washer is provided between the fixing nut and the spring.

[0022] The advantages of adopting the above technical solution are that the setting of two fixing nuts can prevent the nuts from loosening, effectively enhance the stability of the connection, and avoid the fixing nuts from falling off due to long-term vibration of the equipment; the setting of the washer can distribute the pressure of the spring on the fixing nut, reduce the direct friction between the nut and the spring, and extend the service life of the components.

[0023] Furthermore, the side of the clamping ring has a protrusion, the protrusion has a clamping surface that contacts the secondary sealing assembly, and the clamping surface also has a limiting portion for limiting the secondary sealing assembly.

[0024] The advantage of adopting the above technical solution is that by pressing the secondary sealing component with the pressing surface, the sealing effect of the secondary sealing component is guaranteed, and the setting of the limiting part is used to limit the secondary sealing component so that the secondary sealing component will not move. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0026] Figure 1 This is an isometric drawing of the stirring shaft sealing structure of this utility model.

[0027] Figure 2 This is an enlarged view of the utility model.

[0028] Figure 3 This is a side cross-sectional view of the entire utility model.

[0029] Figure 4 This is a prior art structural diagram of the present utility model.

[0030] The reference numerals used in the attached figures are as follows:

[0031] Seat plate 1; Rotating shaft 2; Dynamic seal 3; Protrusion 31; Fixed seal 4; Sealing ring 41; Pressure ring 5; Protrusion 51; Limiting part 52; Spring 6; Guide post 61; Fixing nut 62; Friction plate 7; Fixing ring 8. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] like Figure 1-3 As shown, this utility model discloses a stirring shaft sealing structure for forming a seal between the rotating shaft 2 and the seat plate 1, comprising:

[0034] The primary sealing assembly includes a dynamic seal 3 that rotates with the rotating shaft 2 and a fixed seal 4 that is fixed to the seat plate 1, forming a primary seal;

[0035] A secondary sealing assembly is disposed inside the primary sealing assembly to form a secondary seal;

[0036] The clamping assembly includes a clamping ring 5, which is used to axially clamp the secondary sealing assembly. The clamping ring 5 is also provided with an elastic component to clamp the clamping ring 5 to the secondary sealing assembly.

[0037] The advantage of adopting the above technical solution is that by setting a primary sealing component and a secondary sealing component, the sealing function is guaranteed. At the same time, a clamping component is set to press the secondary sealing component, so that the end face of the clamping ring 5 contacts the secondary sealing component to achieve complete sealing, and the radial eccentricity of the rotating shaft 2 will not affect the sealing performance.

[0038] In some implementations, there are two or more elastic components, which are evenly distributed on the compression ring. The elastic components include: a spring 6, a guide post 61, and a fixing nut 62. The spring 6 is sleeved on the guide post 61, and the fixing nut 62 is set on the guide post 61. Both ends of the guide post 61 have external threads. One end of the guide post 61 passes through the compression ring 5. The sealing element 4 is provided with a threaded hole, and one end of the guide post 61 is locked and fixed with the threaded hole.

[0039] Furthermore, there are two fixing nuts 62, the end of the guide post 61 has external threads, there is a washer between the fixing nut 62 and the spring 6, the two ends of the spring 6 abut against the outside of the clamping ring 5 and the washer, pressing the clamping ring 5 tightly, and the two fixing nuts 62 are arranged side by side.

[0040] The clamping ring 5 is an integral ring-shaped component. Its central part is used for the passage of the rotating shaft 2. The main body is provided with multiple through holes for the passage of guide posts. The side of the clamping ring 5 has a protrusion 51. The protrusion 51 has a clamping surface that contacts the secondary sealing component. The clamping surface also has a limiting part 52 for limiting the secondary sealing component. The limiting part 52 is an annular protrusion provided on the clamping surface of the clamping ring 5. The inner surface of the limiting part 52 contacts the secondary sealing component and cooperates with the clamping surface to limit the position of the secondary sealing component. The entire clamping ring 5 is a one-piece molded metal ring with good hardness, long service life, and resistance to pressure and vibration.

[0041] Furthermore, a sealing ring 41 is provided between the compression ring 5 and the fixed seal 4. A groove for the sealing ring 41 is provided on the fixed seal 4, and the sealing ring 41 is located in the groove for the sealing ring 41. It can be an O-ring sealing ring 41 to ensure a seal between the fixed seal 4 and the compression ring 5.

[0042] In some implementations, the secondary sealing assembly includes a friction plate 7. The friction plate 7 can have a rectangular cross-section, with its inner side contacting the rotating shaft 2. There can be two friction plates arranged side by side, with one side contacting the dynamic seal 3 and the other side being pressed by a clamping ring 5 to form a secondary seal. Even if the rotating shaft 2 moves radially, the inner side of the friction plate 7 still maintains good contact with the rotating shaft 2 under the action of the clamping assembly, ensuring a sealing effect.

[0043] In some implementations, the primary sealing assembly further includes a retaining ring 8 located outside the dynamic seal 3 for fixing the dynamic seal 3 to the rotating shaft 2. The retaining ring 8 is fixed to the rotating shaft 2 by screws, and the screws pass through the dynamic seal 3, causing the dynamic seal 3 to rotate synchronously with the rotating shaft 2. The retaining ring 8 also has a protective function, protecting the dynamic seal 3 and ensuring its service life.

[0044] Furthermore, the dynamic seal 3 is provided with an mounting part and an extension part 31. The extension part 31 extends outward, and the fixed seal 4 is provided with a groove for accommodating the extension part 31. The extension part 31 extends into the groove. The entire dynamic seal 3 is integrally formed. Both the dynamic seal 3 and the fixed seal 4 are labyrinth seals, which increase the resistance to media leakage. It is particularly effective for high temperature, high pressure, high speed and large-size sealing parts. It has a long service life, strong adaptability, simple structure and ensures sealing effect.

[0045] Furthermore, the fixed seal 4 is fixed to the base plate 1 by a locking device, which can be a screw. By fixing the fixed seal and the base plate 1 with screws, the position of the fixed seal 4 is fixed and will not shift due to equipment vibration, thus ensuring the sealing effect and providing a reliable fixed foundation for the overall sealing structure.

[0046] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A stirring shaft sealing structure for forming a seal between a rotating shaft (2) and a seat plate (1), characterized in that, include: The primary sealing assembly includes a dynamic seal (3) that rotates with the shaft (2) and a fixed seal (4) that is fixed to the seat plate (1), forming a primary seal; A secondary sealing assembly is disposed inside the primary sealing assembly to form a secondary seal; The clamping assembly includes a clamping ring (5) for axially clamping the secondary sealing assembly. The clamping ring (5) is also provided with an elastic component to clamp the clamping ring (5) to the secondary sealing assembly.

2. The stirring shaft sealing structure according to claim 1, characterized in that, The elastic component includes a spring (6), a guide post (61), and a fixing nut (62). The spring (6) is sleeved on the guide post (61), and the fixing nut (62) is set on the guide post (61). The guide post (61) passes through the clamping ring (5) and its end is fixed to the sealing member (4).

3. The stirring shaft sealing structure according to claim 1, characterized in that, A sealing ring (41) is provided between the clamping ring (5) and the fixed sealing element (4).

4. The stirring shaft sealing structure according to claim 1, characterized in that, The secondary sealing assembly includes friction plates (7), which are arranged side by side, with one side in contact with the dynamic seal (3) and the other side pressed by a clamping ring (5).

5. The stirring shaft sealing structure according to claim 1, characterized in that, The primary sealing assembly also includes a retaining ring (8), which is located outside the dynamic seal (3) and is used to fix the dynamic seal (3) to the rotating shaft (2).

6. The stirring shaft sealing structure according to claim 1, characterized in that, The dynamic seal (3) is provided with an mounting part and an extension part (31). The extension part (31) extends outward. The fixed seal (4) is provided with a groove for accommodating the extension part (31). The extension part (31) extends into the groove.

7. The stirring shaft sealing structure according to claim 1, characterized in that, The fixed sealing element (4) is fixed to the seat plate (1) by a locking element.

8. The stirring shaft sealing structure according to claim 2, characterized in that, There are two fixing nuts (62), the end of the guide post (61) has external threads, and there is a washer between the fixing nut (62) and the spring (6).

9. The stirring shaft sealing structure according to claim 1, characterized in that, The clamping ring (5) has a protrusion (51) on its side, the protrusion (51) has a clamping surface that contacts the secondary sealing assembly, and the clamping surface also has a limiting part (52) for limiting the secondary sealing assembly.

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