A rotary counter-impeller shaft seal for use on a powder handling equipment

Abstract

The application discloses a rotary anti-push type shaft machine seal used in powder equipment, which is composed of a machine seal outer body and a non-metal material machine seal core fixed on the neck interval position of the shaft outer end, wherein the machine seal outer body is arranged outside the gap between the equipment shaft neck and the equipment outer body, and the non-metal material machine seal core capable of rotating with the shaft neck and anti-pushing the powder which wants to escape is further arranged in the machine seal outer body, so as to realize the sealing effect on the powder material. The non-metal material machine seal core capable of rotating with the shaft neck and anti-pushing the powder which wants to escape is a sheet-shaped laminated mutual pressure structure which is relatively wear-resistant and has a certain elasticity, the elevation angle of the head end of the machine seal sheet pressed in the rear of the tail of each machine seal sheet is consistent with the rotating direction of the shaft. The application can be widely used in the shaft end of the equipment with powder as the material, has the advantages of simple structure, mature principle, realized technology, low manufacturing cost and convenience in realization.

Description

Technical Field

[0001] The present invention relates to a rotary reverse thrust shaft seal used in powder equipment, which belongs to the category of dynamic sealing devices for mechanical shafts. Background Technology

[0002] In powder processing machinery, there are many types of dynamic sealing devices for shafts, but they are mainly labyrinth-type PTFE wear-resistant rope packing and pneumatic backflush type with rotating and stationary rings. However, both types of mechanical seals have their own disadvantages. The labyrinth-type PTFE wear-resistant rope packing mechanical seal relies solely on the static resistance of the PTFE wear-resistant rope to prevent the escape of powder materials. The sealing effect is acceptable in the initial short period of time, but as the gaps widen due to wear of the wear-resistant rope, the sealing effect deteriorates. Generally, a set of mechanical seals can only be used for three or four months of normal trial, after which maintenance or replacement is required. The pneumatic backflush type with rotating and stationary rings, although it has a better sealing effect and longer service life than the labyrinth-type PTFE wear-resistant rope packing mechanical seal, has a more complex structure and higher purchase cost, which greatly limits its development. In particular, it also requires the use of a pressure air source and air circuit equipment, which adds a considerable cost burden to use and maintenance, and is therefore criticized by the industry. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a mechanical seal for shafts of powder equipment that is simple in structure, has a high sealing effect, a long service life, and relatively low purchase, use and maintenance costs.

[0004] To solve the above-mentioned technical problems, the present invention provides a rotary reverse-push shaft mechanical seal used in powder equipment, which consists of a mechanical seal outer body and a non-metallic mechanical seal core fixed on the outer end of the shaft. The mechanical seal outer body is installed on the outside of the gap between the equipment shaft and the equipment outer body, and a non-metallic mechanical seal core that can rotate with the shaft to reverse and push the powder to escape is installed inside the mechanical seal outer body, so as to achieve the sealing effect of the powder material.

[0005] The non-metallic mechanical seal core, which can rotate with the journal to push out the powder, is a relatively wear-resistant and elastic sheet-like laminated structure with mutual pressure at both ends. The angle of elevation of the end of each mechanical seal sheet pressing against the rear end is consistent with the rotation direction of the shaft.

[0006] The non-metallic mechanical seal core that can rotate with the journal to push out the powder is a relatively wear-resistant and somewhat elastic rotary brush structure. The rotation angle formed by the front and rear ends of the rotary brush is consistent with the rotation direction of the shaft.

[0007] The non-metallic mechanical seal core that can rotate with the journal to push out the powder is a relatively wear-resistant and somewhat elastic spiral shaft structure. The spiral angle formed by the front and rear ends of the spiral shaft blades is consistent with the rotation direction of the shaft.

[0008] Compared with existing technologies, the present invention has the following beneficial effects: (1) The mechanical sealing device of the present invention can be widely used at the shaft end of equipment with powder as material; (2) The mechanical sealing device of the present invention has a simple structure, mature principle, and can be implemented technically, and the manufacturing cost is not high, making it easy to implement. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the assembly and working principle of the first rotary reverse thrust shaft mechanical seal used in powder equipment;

[0010] Figure 2 This is a schematic diagram of the outer body structure and the shoulder neck structure of the first rotary reverse thrust shaft mechanical seal used in powder equipment;

[0011] Figure 3 This is a schematic diagram of the core structure of the first rotary reverse thrust shaft mechanical seal used in powder equipment;

[0012] Figure 4 This is a schematic diagram of the assembly and working principle of the second type of rotary reverse thrust shaft mechanical seal used in powder equipment;

[0013] Figure 5 This is a schematic diagram of the outer body structure and the shoulder neck structure of the second type of rotary reverse thrust shaft mechanical seal used in powder equipment; Figure 6 This is a schematic diagram of the core component structure of the second type of rotary reverse thrust shaft mechanical seal used in powder equipment;

[0014] Figure 7 This is a schematic diagram of the assembly and working principle of the third type of rotary reverse thrust shaft mechanical seal used in powder equipment;

[0015] Figure 8 This is a schematic diagram of the outer body structure and the shoulder neck structure of the third type of rotary reverse thrust shaft mechanical seal used in powder equipment;

[0016] Figure 9 This is a schematic diagram of the core structure of the third type of rotary reverse thrust shaft mechanical seal used in powder equipment;

[0017] In the diagram: 1. Powder equipment shaft; 2. Powder material; 3. Mechanical seal fixing screw; 4. Mechanical seal outer body; 5. Mechanical seal cover fixing screw; 6. Mechanical seal cover; 7. Mechanical seal core fixing screw; 8. Outer end of powder equipment shaft; 9. Working rotation direction of powder equipment shaft; 10. Outer wall of powder equipment shaft; 11. Wear-resistant non-metallic sheet-like laminated mechanical seal core; 12. Shaft neck position; 13. Shaft clearance; 14. Threaded screw hole; 15. Screw through hole; 16. Wear-resistant non-metallic rotary shaft-shaped brush-type mechanical seal core; 17. Mechanical seal core fixing screw; 18. Screw through hole; 19. Wear-resistant non-metallic spiral shaft-type mechanical seal core; 20. Mechanical seal core fixing screw; 21. Screw through hole; 22. Diagram of the angle of inclination of the sheet-like laminated blades pressing against each other; 23. Diagram of the angle of inclination formed by the front and rear ends of the rotary shaft-shaped brush; 24. Diagram of the angle of inclination formed by the front and rear ends of the spiral shaft-shaped blade; 25. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention consists of a mechanical seal outer body 4, a mechanical seal cover 6, and a wear-resistant non-metallic sheet-like laminated mechanical seal core 11.

[0020] Figure 1 In the middle, the mechanical seal outer body 4 is fixed to the outer side of the shaft end of the axial outer body wall 10 of the powder equipment by multiple mechanical seal fixing screws 3, and the wear-resistant non-metallic sheet-like stacked mechanical seal core 11 is fixed to the outer side of the shaft end of the axial outer body wall 10 by multiple mechanical seal core fixing screws 7 through screw through holes 15. Figure 2 ) and threaded hole 14 ( Figure 2 ) is fixed at journal position 12 ( Figure 2 The shaft of the powder equipment 1 and the outer end 8 of the powder equipment shaft are sealed inside the outer body 4 by the mechanical seal cover 6 and multiple mechanical seal cover fixing screws 5. When the shaft neck position 12 ( Figure 2 When the wear-resistant non-metallic sheet-like laminated mechanical seal core 11 rotates in the working rotation direction 9 of the powder equipment shaft, due to the existence of the sheet-like laminated head-to-tail pressing angle 23, it is intended to move from the shaft gap 13 ( Figure 2 The powder material 2 that escapes from the outer wall 10 of the powder equipment is pushed back into the shaft gap 13 by the wear-resistant non-metallic sheet-like laminated mechanical seal core 11 under the action of rotational thrust. Figure 2 In this process, the escape of powder material 2 is blocked, thus achieving the mechanical sealing effect of density.

[0021] Figure 2 and Figure 3 In the middle, all are Figure 1 The diagram illustrates the decomposition and partial structure of the component. Example

[0022] like Figure 4 , Figure 5 and Figure 6 As shown, the present invention consists of a mechanical seal outer body 4, a mechanical seal cover 6, and a wear-resistant non-metallic rotary brush-type mechanical seal core body 16.

[0023] Figure 4 In the middle, the mechanical seal outer body 4 is fixed to the outer side of the shaft end of the axial outer body wall 10 of the powder equipment by multiple mechanical seal fixing screws 3, and the wear-resistant non-metallic rotary brush mechanical seal core 16 is fixed to the outer side of the shaft end of the axial outer body wall 10 by two mechanical seal core fixing screws 17 through screw through holes 19. Figure 6 ) and threaded hole 18 ( Figure 5 The core body 16 is fixed to the outer end 8 of the powder equipment shaft and encapsulated within the outer body 4 by the mechanical seal cover 6 through multiple mechanical seal cover fixing screws 5. When the powder equipment shaft 1 and the outer end 8 of the powder equipment shaft drive the wear-resistant non-metallic rotary brush type mechanical seal core 16 to rotate in the working rotation direction 9 of the powder equipment shaft, due to the existence of the rotation angle 24 formed by the front and rear ends of the rotary brush, it is intended to move from the shaft gap 13 ( Figure 5 The powder material 2 that escapes from the outer wall 10 of the powder equipment is pushed back into the shaft gap 13 by the rotating brush on the wear-resistant non-metallic rotating brush machine core 16 under the action of rotational thrust. Figure 5 In this process, the escape of powder material 2 is blocked, thus achieving the mechanical sealing effect of density.

[0024] Figure 5 and Figure 6 In the middle, all are Figure 4 The diagram illustrates the decomposition and partial structure of the component. Example

[0025] like Figure 7 , Figure 8 and Figure 9 As shown, the present invention consists of a mechanical seal outer body 4, a mechanical seal cover 6, and a spiral shaft type mechanical seal core body 20.

[0026] Figure 7 In the middle, the mechanical seal outer body 4 is fixed to the outer side of the shaft end of the axial outer body wall 10 of the powder equipment by multiple mechanical seal fixing screws 3, and the wear-resistant non-metallic spiral shaft mechanical seal core 20 is fixed by two mechanical seal core fixing screws 21 through screw through holes 22 ( Figure 9 ) and threaded hole 18 ( Figure 8 The core body 20 is fixed to the outer end 8 of the powder equipment shaft and encapsulated within the outer body 4 by the mechanical seal cover 6 and multiple mechanical seal cover fixing screws 5. When the powder equipment shaft 1 and the outer end 8 of the powder equipment shaft drive the wear-resistant non-metallic spiral shaft type mechanical seal core 20 to rotate in the working rotation direction 9 of the powder equipment shaft, due to the existence of the spiral elevation angle 25 formed by the front and rear ends of the spiral shaft-shaped blade, it is intended to move from the shaft gap 13 ( Figure 8 The powder material 2 that escapes from the outer wall 10 of the powder equipment is pushed back into the shaft gap 13 by the spiral blades on the wear-resistant non-metallic spiral shaft core 20 under the action of rotational thrust. Figure 8 In this process, the escape of powder material 2 is blocked, thus achieving the mechanical sealing effect of density.

[0027] Figure 8 and Figure 9 In the middle, all are Figure 7 The diagram illustrates the decomposition and partial structure of the component.

Claims

1. A rotary thrust shaft mechanical seal used in powder processing equipment, comprising a mechanical seal outer body and a non-metallic mechanical seal core fixed to the shoulder of the outer end of the shaft, characterized in that, On the outside of the gap between the equipment journal and the equipment body, a mechanical seal outer body is installed. Inside the mechanical seal outer body, a non-metallic mechanical seal core is installed, which can rotate with the journal to push back the powder to be released, so as to achieve the sealing effect of the powder material.

2. The rotary thrust shaft mechanical seal used in powder processing equipment according to claim 1, characterized in that, The non-metallic mechanical seal core, which can rotate with the journal to push out the powder, is a relatively wear-resistant and elastic sheet-like laminated structure with mutual pressure at both ends. The angle of elevation of the end of each mechanical seal sheet pressing against the rear end is consistent with the rotation direction of the shaft.

3. A rotary thrust shaft mechanical seal for use in powder processing equipment according to claim 1, characterized in that, The non-metallic mechanical seal core that can rotate with the journal to push out the powder is a relatively wear-resistant and somewhat elastic rotary brush structure. The rotation angle formed by the front and rear ends of the rotary brush is consistent with the rotation direction of the shaft.

4. A rotary thrust shaft mechanical seal for use in powder processing equipment according to claim 1, characterized in that, The non-metallic mechanical seal core that can rotate with the journal to push out the powder is a relatively wear-resistant and somewhat elastic spiral shaft structure. The spiral angle formed by the front and rear ends of the spiral shaft blades is consistent with the rotation direction of the shaft.

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