CN110332312B

CN110332312B - Axial combined sealing mechanism

Info

Publication number: CN110332312B
Application number: CN201910606671.5A
Authority: CN
Inventors: 范慧君
Original assignee: Nantong Fanshi Machinery Co ltd
Current assignee: Nantong Fanshi Machinery Co ltd
Priority date: 2019-07-06
Filing date: 2019-07-06
Publication date: 2021-07-23
Anticipated expiration: 2039-07-06
Also published as: CN110332312A

Abstract

The invention discloses an axial combined sealing mechanism, which consists of a main shaft, a labyrinth sealing part, a release bin, a packing shaft sealing part and a bearing seat, wherein the labyrinth sealing part, the release bin, the packing shaft sealing part and the bearing seat are sequentially sleeved on the main shaft; and a combined box is sleeved on the peripheries of the cover labyrinth seal part, the release bin and the packing shaft seal part. The release bin is additionally connected with a vacuum pumping device, wherein the vacuum degree is slightly less than that in the kneading machine. The invention has good shaft seal effect and small friction resistance, the powder in the release bin can not flow back into the kneading machine, and meanwhile, the dust or fluid in the kneading machine can be prevented from overflowing into the release bin.

Description

Axial combined sealing mechanism

Technical Field

The invention relates to a shaft seal technology in the fluid machinery industry.

Background

The vacuum kneader is a common chemical mechanical product, and when a reamer of the vacuum kneader rotates, a shaft neck part is sealed by weaving a soft filler (commonly called packing) so as to prevent air outside a pot body from entering the inside of the pot body when the shaft rotates, and the inside of the pot body reaches the required vacuum degree under the action of a vacuum pump. However, the packing is inevitably worn continuously due to the long-term rotation of the reamer shaft, so that the sealing effect is gradually reduced, the phenomenon of air leakage and material leakage of the pot body is caused, the production efficiency is reduced, the loss of raw materials is improved, and more troublesome is that the worn packing powder is continuously sucked into the materials in the pot body (for example, food is stirred in the pot) under the action of negative pressure (suction force) in the pot, so that the product quality is directly influenced, the problem troubles many enterprises for a long time, although the phenomenon of reduction and material leakage of the vacuum degree can be relieved to a certain extent by regulating the pressure of the packing and replacing the packing, the sealing structure of the woven packing (packing) causes people to feel that the defects are more in the food industry for many years.

The invention of patent application No. 2018109205664 provides a flexible sealing device for a stirring shaft of a vacuum kneader, and parts of the flexible sealing device comprise: the sealing device comprises a fixed flange, a corrugated flexible pipe, a transition flange, a sealing cavity, a sealing ring, a double-O-shaped ring, a shaft sleeve, a bearing, a spring and a fixed ring; wherein, the bearing is sleeved on the shaft sleeve, the bearing is sleeved on the sealing cavity, the spring is arranged in the sealing cavity, the spring drives the shaft sleeve to tightly extrude the sealing ring, the sealing ring is arranged in the transition flange and is connected and fixed with the sealing cavity into a whole, the transition flange is connected with the fixed flange through the corrugated flexible pipe, and the fixed flange is fixed on the side plate of the kneading machine; the kneader has the advantages of more sealing parts, larger abrasion, larger noise and higher maintenance cost.

Disclosure of Invention

The purpose of the invention is as follows:

the axial combined sealing mechanism has good sealing effect and can prevent the sealing filler dust from flowing backwards.

The technical scheme is as follows:

the invention discloses an axial combined sealing mechanism, which can be applied to machinery such as a kneader, a fan and the like in a matching way and comprises a main shaft, a labyrinth sealing part, a release bin (preferably, the vertical section of the release bin is similar to a Chinese character 'zhong', and larger spaces are reserved at the upper side and the lower side of the release bin, so that dust in an external pipeline can be conveniently and intensively taken out), a packing shaft sealing part (provided with oil-containing packing, a sliding sleeve and a pressing flange), a bearing seat and the like, wherein the labyrinth sealing part is sleeved on the main shaft in sequence; and the combined box is sleeved on the peripheries of the cover labyrinth seal part, the release bin and the packing shaft seal part. Preferably, the labyrinth seal sleeve and the sliding sleeve are sleeved on the main shaft and are fixedly integrated with the main shaft to rotate together (no gap is formed between the labyrinth seal sleeve and the main shaft, the sealing effect is improved, and the rotation resistance of the main shaft is reduced). And very small gaps are formed among the outer circumference of the sliding sleeve, the outer circumference of the labyrinth seal part and the joint surface of the combined box, and the gaps are respectively communicated with the release bin. The releasing bin is additionally connected with a vacuumizing device (powder is extracted from the releasing bin-a filter screen is arranged on a vacuum pipeline, and the vacuumizing is carried out at the same time). When the kneader is in operation, the vacuum degree is about 30-70% of the vacuum degree (air pressure) in the kneader, the vacuum degree is dynamic (the mechanism can also be provided with a self-control device which can test the air pressure in the kneader and automatically adjust and control the air pressure in the release bin according to the test value), and the vacuum degree is increased to be slightly less than the atmospheric pressure when the kneader is fed and discharged. The powder (powder generated by filler consumption, powder and fluid leaked from the kneader) in the release bin is ensured not to flow back into the kneader, and meanwhile, the difference value between the air pressure in the kneader and the air pressure in the release bin is not too large, so that the phenomenon that dust or fluid in the kneader overflows into the release bin when the pressure in the release bin is too small, and the shaft seal is poor is avoided.

The pressure generated by the pressing flange can be adjusted through a screw, so that the pressure generated by the pressing flange on the filler can be adjusted.

The working principle is as follows: the material powder wants to flow out from the inner side 2 of the box body along with the rotating main shaft 1 and must pass through three labyrinth grooves, the resistance of the labyrinth grooves to the material powder is reduced gradually, the powder which can be leaked finally falls into the release bin 5, and the release bin can be cleaned regularly according to the amount of the leaked powder. The powder which can leak out is isolated by the release bin 5, the oil-containing filler 6, the sliding sleeve 7 and the pressing flange 8 behind the powder-free layer operate under the condition that no powder layer exists at the shaft end, and no material leakage exists at the shaft end. The sealing effect is incomparable with other sealing forms.

Has the advantages that:

1. the technical key of the application fills up the technical blank of the kneader structure.

2. The technology of this patent application has reduced the time of shutting down the maintenance for the user, has saved labour cost. The material leakage of the host is controlled from the source, the production cost is reduced, the environmental pollution is reduced, and the field management of users is facilitated.

3. The technology of the patent application brings the improvement of the safety and the quality superiority of processed food for users in practical use, and the social and economic benefits are considerable.

4. The invention combines a plurality of shaft seal modes and has good shaft seal effect; the release bin is arranged between the labyrinth seal part and the packing shaft seal part, and has no friction with the main shaft, thereby reducing the friction resistance and the noise, reducing the abrasion consumption of the main shaft by dust collection, prolonging the service life of the main shaft,

5. the consumption of the filler produces a powder which does not contaminate the material processed in the kneader or cause dust from the sealing material blown off by the blower.

6. The vacuum degree in the release bin is dynamically adjusted, so that dust cannot flow back, and the pressure difference is not too large, so that the kneading machine overflows fluid or a fan blows dust.

Drawings

FIG. 1 is a schematic view of an axial cross-sectional configuration of the present invention;

FIG. 2 is an enlarged view of the structure of section B-B in FIG. 1;

in the figure, a main shaft 1, a box body 2, a combined seal box 3, a labyrinth seal sleeve 4, a release bin 5, oil-containing filler 6, a sliding sleeve 7, a pressing flange 8 and a bearing seat 9.

Detailed Description

The axial combined sealing mechanism shown in fig. 1 and 2 can be applied to machines such as a kneader and a fan in a matching manner, and comprises a main shaft, and a labyrinth sealing part, a release bin, a packing shaft sealing part and a bearing seat which are sequentially sleeved on the main shaft; in addition, the combined box is sleeved on the peripheries of the cover labyrinth seal part, the release bin and the packing shaft seal part; the packing shaft seal is composed of oil-containing packing, a sliding sleeve and a pressing flange; and very small gaps are formed among the outer circumference of the sliding sleeve, the outer circumference of the labyrinth seal part and the joint surface of the combined box, and the gaps are respectively communicated with the release bin.

The labyrinth seal cover and the sliding sleeve are sleeved on the main shaft and can rotate together with the main shaft.

The packing pressure can be adjusted by a screw on the flange.

During operation, the vacuum degree in the release bin is dynamic, and the vacuum degree of the release bin is about 30-70% of the vacuum degree in the kneader.

Claims

1. An axial combined sealing mechanism can be applied to kneading machines and fan machines in a matching way, and is characterized by comprising a main shaft, a labyrinth sealing part, a release bin, a packing shaft seal part and a bearing seat, wherein the labyrinth sealing part, the release bin, the packing shaft seal part and the bearing seat are sequentially sleeved on the main shaft; the labyrinth seal sleeve and the sliding sleeve are sleeved on the main shaft and rotate together with the main shaft; the labyrinth seal cover and the sliding sleeve are sleeved on the main shaft and are fixed into a whole, gaps are arranged among the outer circumference of the sliding sleeve, the outer circumference of the labyrinth seal part and the joint surface of the combined box, the gaps are respectively communicated with the release bin, the release bin is connected with a vacuumizing device through a vacuum pipeline, and a filter screen is arranged on the vacuum pipeline; the automatic control device is also arranged and can test the air pressure in the kneader and automatically regulate and control the air pressure in the release bin according to the test value, the vacuum degree in the release bin is dynamic, and the air pressure in the release bin is ensured to be lower than the air pressure in the kneader; the vacuum pipeline is provided with a filter screen; when the device is applied to the kneader, the vacuum degree of the release bin is 30-70% of the vacuum degree in the kneader.