Anti-fouling agitator shaft bushing

Abstract

The utility model relates to the technical field of stirring equipment, disclose a kind of anti-fouling's stirring shaft sleeve, the sleeve includes two semicircular sleeve shells, two the sleeve shell detachably connected, the sleeve inside is equipped with sealing gasket, the sealing gasket is closely combined with sleeve inner wall, the sealing gasket is composed of two semicircular gasket units, the sleeve outer wall is trapezoidal annular convex structure, annular convex height sequentially evenly gradient decreases from center to both ends, the sleeve upper and lower ends are equipped with outwardly turned flanging. The utility model is sprayed polytetrafluoroethylene sealing coating and nanometer roughening treatment on the inner surface of sleeve, can significantly reduce medium adhesion rate. The split type structure of sleeve and sealing gasket supports quick disassembly and assembly, without disassembling equipment main body. The gradient gradually changing height design of sleeve outer wall annular convex, can reduce eddy current area, reduce local deposition risk.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment technology, specifically to a mixing shaft sleeve that prevents scaling. Background Technology

[0002] In the production and processing of chemicals, food, and pharmaceuticals, reaction vessels are used, and stirring devices need to be installed inside them. The stirring shaft of the stirring device is connected to the reaction vessel via a bushing. Existing bushings are usually made of a single, integral structure, which is inconvenient for installation and maintenance. The bushing of patent CN222163248U uses a "two-part fastening sleeve with interlocking," which solves the problem of inconvenient installation and maintenance of the integral structure, but it has the following drawbacks: the medium easily forms a vortex zone in the gap between the bushing and the tank body (the vortex intensity reaches 0.8 m / s when the Reynolds number Re < 2000); the medium velocity in the vortex zone decreases, forming deposition hotspots, and local deposition leads to an increase in scale thickness, thus affecting the service life. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a stirring shaft sleeve that prevents scaling.

[0004] To achieve the above objectives, the technical solution of this utility model is: a scale-resistant stirring shaft sleeve, the sleeve comprising two semi-circular sleeve shells detachably connected, a sealing gasket provided inside the sleeve, the sealing gasket being tightly fitted to the inner wall of the sleeve, the sealing gasket being composed of two semi-circular gasket units, the outer wall of the sleeve having a trapezoidal annular protrusion structure, the height of the annular protrusion decreasing uniformly from the center to both ends, and the upper and lower ends of the sleeve having outwardly turned flanges.

[0005] Furthermore, the two bushing housings are connected by bolts.

[0006] Furthermore, the sealing gasket is a fluororubber sealing gasket.

[0007] Furthermore, the inner surface of the bushing is coated with a polytetrafluoroethylene sealing coating with a thickness of 0.2-0.5 mm.

[0008] Furthermore, the surface of the polytetrafluoroethylene sealing coating is provided with laser-etched textured surfaces.

[0009] Furthermore, the center height of the annular protrusion is 6-10mm, the height of both ends is 2-4mm, and the width of the annular protrusion is 15-25mm.

[0010] Furthermore, the flange width is 10-20mm and the thickness is 4-8mm.

[0011] Furthermore, the flange is embedded with several positioning pins.

[0012] The beneficial effects of this invention are as follows: The inner surface of the bushing is coated with a polytetrafluoroethylene (PTFE) sealing coating and undergoes nano-roughening treatment, which significantly reduces the media adhesion rate. The split structure of the bushing and the fluororubber gasket allows for quick assembly and disassembly without disassembling the main equipment. The gradient height design of the annular protrusion on the outer wall of the bushing reduces eddy current areas and lowers the risk of localized deposition. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0015] Figure 3 yes Figure 1 A magnified schematic diagram of a portion of the structure.

[0016] In the figure: 1. Bushing; 11. Bushing housing; 12. Bolt; 13. Sealing coating; 2. Sealing gasket; 3. Annular protrusion; 4. Flanged edge; 41. Locating pin. Detailed Implementation

[0017] Example:

[0018] like Figures 1 to 3 As shown, an anti-scaling stirring shaft sleeve is provided. The sleeve 1 includes two semi-circular sleeve shells 11, which are detachably connected by bolts 12. Fluororubber O-rings are installed in the bolt holes of the sleeve shells 11 to enhance the sealing performance of the bolt connection. A sealing gasket 2 is provided inside the sleeve 1, which fits tightly against the inner wall of the sleeve 1 to achieve dynamic sealing. The sealing gasket 2 is composed of two semi-circular gasket units and is made of fluororubber.

[0019] The outer wall of the bushing 1 has a trapezoidal annular protrusion 3 structure. The height of the annular protrusion 3 decreases uniformly from the center to both ends, which can disperse contact pressure, optimize fluid flow path, and reduce eddy formation. The height (H1) of the central annular protrusion 3 is 10mm, the height (H2) of the annular protrusion 3 at the ends is 4mm, and the width (L1) of the annular protrusion 3 is 20mm. The bushing 1 has outwardly turned flanges 4 at both the upper and lower ends. The flanges 4 have a width (L2) of 15mm and a thickness (D) of 6mm. Several positioning pins 41 are embedded in the flanges 4 for quick alignment of the bushing 1.

[0020] The inner surface of the bushing 1 is coated with a 0.3 mm thick polytetrafluoroethylene (PTFE) sealing coating 13 by plasma spraying, with a Shore hardness of 60 Shore D. The PTFE sealing coating 13 has a laser-etched textured surface with a micron-nano structure and a contact angle of 125°. The PTFE sealing coating 13 undergoes nanoscale roughening treatment to further enhance its hydrophobicity and anti-scaling properties.

[0021] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

[0022] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

Claims

1. A scale-resistant stirring shaft sleeve, characterized in that: The bushing includes two semi-circular bushing shells that are detachably connected. A sealing gasket is provided inside the bushing, which fits tightly against the inner wall of the bushing. The sealing gasket is composed of two semi-circular gasket units. The outer wall of the bushing has a trapezoidal annular protrusion structure, and the height of the annular protrusion decreases uniformly from the center to both ends. The upper and lower ends of the bushing have outward-turned flanges.

2. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The two bushing housings are connected by bolts.

3. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The sealing gasket is a fluororubber sealing gasket.

4. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The inner surface of the bushing is coated with a polytetrafluoroethylene sealing coating with a thickness of 0.2-0.5 mm.

5. The anti-scaling stirring shaft sleeve according to claim 4, characterized in that: The surface of the polytetrafluoroethylene sealing coating has a laser-etched texture.

6. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The annular protrusion has a center height of 6-10mm, a height of 2-4mm at both ends, and a width of 15-25mm.

7. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The flange width is 10-20mm and the thickness is 4-8mm.

8. The anti-scaling stirring shaft sleeve according to claim 1, characterized in that: The flange is embedded with several positioning pins.

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