A combined seal for the shaft end of a powder mixer

Abstract

The utility model discloses a kind of powder mixing machine shaft end combination sealing devices, including shaft end, end cover, bearing, gasket, skeleton oil seal, sealing stationary ring and sealing movable ring, sealing movable ring is fixedly sleeved on shaft end, sealing stationary ring is fixed on powder mixing machine cylinder wall and is sleeved in sealing movable ring outside and forms annular gap between the two, labyrinthine cavity is equipped between sealing stationary ring and sealing movable ring inner end, end cover with built-in bearing and gasket is fixed on powder mixing machine cylinder wall and is sleeved in shaft end, gasket is located between the outer end of bearing and sealing stationary ring, skeleton oil seal is equipped between sealing stationary ring and sealing movable ring outer end, compression air inlet is equipped on sealing stationary ring, the compression air inlet is communicated with annular gap and forms micro-positive pressure sealing cavity.The utility model adopts labyrinthine cavity, skeleton oil seal and micro-positive pressure combination type sealing, eliminates the quality hidden danger of microorganism and foreign matter, reduces the frequency of dismantling shaft end sealing cleaning, reduces artificial operation difficulty, improves efficiency.

Description

Technical Field

[0001] This utility model relates to shaft end sealing technology for powder mixing equipment, and more particularly to a combined shaft end sealing device for a powder mixer. Background Technology

[0002] With the improvement of people's living standards, especially the increasing demands for food taste, powdered seasonings have experienced rapid development and widespread use, leading to a corresponding increase in powder processing and mixing equipment. However, the shaft end sealing of most powder mixing equipment remains a challenge. Currently, shaft end seals in powder mixing equipment typically employ packing seals or skeleton oil seals, which suffer from the following problems:

[0003] (1) After long-term and high-speed operation, fine dust will enter the sealing area along the shaft axis, causing wear between the packing or skeleton oil seal and the shaft, and grinding the packing into powder, which can easily cause foreign object hazards.

[0004] (2) When cleaning the mixer, water will flow into the sealing cavity through the sealing gap of the shaft and rub against the tiny dust and packing to produce black substances, which may lead to foreign objects and microbial hazards in the material.

[0005] (3) In order to solve the above problems, after each day's production, the operators can only frequently remove the seals used for cleaning, drying and then reinstalling them, which leads to low efficiency, waste of manpower and high operational difficulty. Utility Model Content

[0006] The purpose of this invention is to provide a combined sealing device for the shaft end of a powder mixer with good shaft end sealing performance.

[0007] The objective of this utility model is achieved through the following technical measures: a combined sealing device for the shaft end of a powder mixer, characterized in that it includes a shaft end, an end cover, a bearing, a gasket, a skeleton oil seal, a sealing stationary ring, and a sealing rotating ring. The sealing rotating ring is fixedly fitted onto the inner end of the shaft end and located in the shaft mounting hole of the powder mixer cylinder wall. The sealing stationary ring is fixed to the powder mixer cylinder wall and fits around the sealing rotating ring, forming an annular gap between them. A connection is provided between the inner ends of the sealing stationary ring and the sealing rotating ring and the inner end of the annular gap. The system includes interconnected labyrinthine cavities that are connected to the interior of the powder mixer cylinder. An end cap containing a bearing and a gasket is fixed to the cylinder wall and fitted onto the outer end of the shaft. The gasket is located between the bearing and the outer end of the sealing ring. A skeleton oil seal for sealing the outer end of the annular gap is provided between the outer ends of the sealing ring and the sealing moving ring, and the skeleton oil seal is close to the gasket. A compressed air inlet is provided on the sealing ring, and the compressed air inlet communicates with the annular gap to form a micro-positive pressure sealing cavity.

[0008] This utility model adopts a combination of labyrinthine cavity, skeleton oil seal and micro-positive pressure sealing structure, which eliminates the quality risks of microorganisms and foreign objects, and greatly reduces the frequency of disassembling the shaft end seal for cleaning, which can significantly reduce the difficulty of manual operation and improve efficiency.

[0009] The sealing ring of this invention consists of a first cylinder fitted onto the shaft end and a flange located at the inner end of the first cylinder. An annular boss is provided on the outer surface of the flange. The sealing ring consists of a second cylinder fitted onto the first cylinder and an annular flange located on the outer wall of the second cylinder. The compressed air inlet is located on the outer surface of the annular flange. An annular groove is provided on the inner end face of the second cylinder. The annular boss and the annular groove are adapted to form a labyrinthine cavity between the inner end face of the sealing ring and the flange of the sealing ring. The skeleton oil seal is located between the inner wall of the second cylinder and the outer wall of the first cylinder. The annular flange and the end cap are fixed to the cylinder wall of the powder mixer by the same connector.

[0010] Compared with the prior art, the present invention has the following significant advantages:

[0011] (1) This utility model adopts a labyrinthine cavity between the sealing fixed ring and the sealing moving ring to prevent powder from entering the shaft end sealing cavity. In addition, the skeleton oil seal and micro positive pressure air blowing ensure that powder cannot enter the shaft sealing cavity, eliminating the quality risks of microorganisms and foreign objects, and greatly reducing the frequency of disassembling the shaft end seal for cleaning. This can significantly reduce the difficulty of manual operation and improve efficiency.

[0012] (2) The micro-positive pressure sealing cavity of this utility model is always filled with clean and circulating compressed air. This can cool down the heat generated by the friction between the skeleton oil seal and the machine shaft, ensure the cleanliness of the micro-positive pressure sealing cavity, reduce the cleaning time and difficulty of the mixer, and prevent the growth of microorganisms.

[0013] (3) This utility model has a simple structure, low cost, and strong practicality, and is suitable for widespread promotion and use. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a cross-sectional view of the present invention;

[0016] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0017] In the diagram, 1-compressed air inlet, 2-micro-positive pressure sealing cavity, 3-end cover, 4-bearing, 5-gasket, 6-sealing ring, 7-skeleton oil seal, 8-sealing ring, 9-machine shaft, 10-compressed air outlet, 11-powder mixer cylinder wall, 12-annular gap, 13-labyrinth-type cavity, 14-annular flange, 15-connector, 16-powder mixer cylinder body, 17-annular boss. Detailed Implementation

[0018] like Figure 1 and Figure 2 As shown, this utility model discloses a shaft end combined sealing device for a powder mixer, comprising a shaft end of a shaft 9, an end cover 3, a bearing 4, a gasket 5, a skeleton oil seal 7, a sealing fixed ring 6, and a sealing moving ring 8. The sealing moving ring 8 is fixedly fitted onto the inner end of the shaft end and located in the shaft mounting hole of the powder mixer cylinder wall 11. The sealing fixed ring 6 is fixed onto the powder mixer cylinder wall 11 and fits around the sealing moving ring 8, forming an annular gap 12 between the two. A labyrinthine cavity communicating with the inner end of the annular gap 12 is provided between the inner ends of the sealing fixed ring 6 and the sealing moving ring 8. 13, and the labyrinthine cavity 13 is connected to the inside of the powder mixer cylinder 16. The end cap 3, which contains the bearing 4 and the gasket 5, is fixed on the end cylinder wall of the powder mixer and fitted onto the outer end of the shaft. The gasket 5 is located between the bearing 4 and the outer end of the sealing ring 6. A skeleton oil seal 7 for sealing the outer end of the annular gap 12 is provided between the outer end of the sealing ring 6 and the outer end of the sealing ring 8. The skeleton oil seal 7 is close to the gasket 5. A compressed air inlet 1 is provided on the sealing ring 6. The compressed air inlet 1 is connected to the annular gap 12 to form a micro-positive pressure sealing cavity 2.

[0019] In this embodiment, the sealing ring 8 is integrally formed by a first cylinder fitted on the shaft end and a flange located at the inner end of the first cylinder. An annular boss 17 is provided on the outer side of the flange. The sealing ring 6 is integrally formed by a second cylinder fitted on the first cylinder and an annular flange 14 located on the outer wall of the second cylinder. The compressed air inlet 1 is located on the outer side of the annular flange 14. An annular groove is provided on the inner end face of the second cylinder. The annular boss 17 and the annular groove are adapted to form a labyrinthine cavity 13 between the inner end face of the sealing ring 6 and the flange of the sealing ring 8. The skeleton oil seal 7 is located between the inner wall of the second cylinder and the outer wall of the first cylinder. The annular flange 14 and the end cap 3 are fixed to the cylinder wall 11 of the powder mixer by the same connector 15.

[0020] The working principle of this utility model is as follows: When the powder mixer is running at high speed, the mixer shaft 9 rotates at high speed under the support of the bearing 4. The sealing ring 8 rotates at high speed along with the inner ring of the bearing 4. The clean compressed air, after purification and pressure reduction, enters the micro-positive pressure sealing chamber 2 from the compressed air inlet 1. In the micro-positive pressure sealing chamber 2, the right side is sealed by the skeleton oil seal 7 to prevent the compressed air from flowing to the bearing 4 side. At the same time, the compressed air can only pass through the labyrinth-type cavity 13 to the left, and finally is discharged into the powder mixer cylinder 16 from the compressed air outlet 10. This prevents powder from entering the micro-positive pressure sealing chamber 2. Moreover, the labyrinth-type micro-positive pressure chamber design can reduce the pressure generated by the powder in the mixer cylinder when it is running at high speed, preventing the powder from flowing radially into the micro-positive pressure sealing chamber 2 along the shaft end, thus achieving a good sealing effect. Because the micro-positive pressure sealing chamber 2 is always filled with clean and circulating compressed air, it can cool down the heat generated by the friction between the skeleton oil seal 7 and the machine shaft 9, ensure the cleanliness of the micro-positive pressure sealing chamber 2, reduce the cleaning time and difficulty of the mixer, and prevent the growth of microorganisms.

[0021] The embodiments of this utility model are not limited thereto. Based on the above content of this utility model, and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, this utility model can also be modified, replaced or changed in various other forms, all of which fall within the scope of protection of this utility model.

Claims

1. A combined sealing device for the shaft end of a powder mixer, characterized in that: The assembly includes a shaft end, end cap, bearing, gasket, skeleton oil seal, sealing stationary ring, and sealing rotating ring. The sealing rotating ring is fixedly fitted onto the inner end of the shaft end and located in the shaft mounting hole on the cylinder wall of the powder mixer. The sealing stationary ring is fixed to the cylinder wall of the powder mixer and fits around the sealing rotating ring, forming an annular gap between them. A labyrinthine cavity communicating with the inner end of the annular gap is provided between the inner ends of the sealing stationary ring and the sealing rotating ring, and the labyrinthine cavity communicates with the interior of the powder mixer cylinder. An end cap containing a bearing and a gasket is fixed to the cylinder wall of the powder mixer and fitted onto the outer end of the shaft end. The gasket is located between the outer ends of the bearing and the sealing stationary ring. A skeleton oil seal for sealing the outer end of the annular gap is provided between the outer ends of the sealing stationary ring and the sealing rotating ring, and the skeleton oil seal is close to the gasket. A compressed air inlet is provided on the sealing stationary ring, and the compressed air inlet communicates with the annular gap to form a slightly positive pressure sealing cavity.

2. The powder mixer shaft end combined sealing device according to claim 1, characterized in that: The sealing moving ring consists of a first cylinder fitted onto the shaft end and a flange located at the inner end of the first cylinder. An annular boss is provided on the outer surface of the flange. The sealing stationary ring consists of a second cylinder fitted onto the first cylinder and an annular flange located on the outer wall of the second cylinder. The compressed air inlet is located on the outer surface of the annular flange. An annular groove is provided on the inner end face of the second cylinder. The annular boss and the annular groove are adapted to form a labyrinthine cavity between the inner end face of the sealing stationary ring and the flange of the sealing moving ring. The skeleton oil seal is located between the inner wall of the second cylinder and the outer wall of the first cylinder. The annular flange and the end cap are fixed to the cylinder wall of the powder mixer by the same connector.

Images