CN112892885A

CN112892885A - Micro positive pressure air sealing type bag-turning type automatic centrifuge

Info

Publication number: CN112892885A
Application number: CN202110176666.2A
Authority: CN
Inventors: 张德友; 陈崔龙; 陈道林; 卓培忠; 李传祥
Original assignee: HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD; Hefei General Machinery Research Institute Co Ltd
Current assignee: HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD; Hefei General Machinery Research Institute Co Ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-06-04

Abstract

The invention discloses a micro positive pressure gas sealing type bag-turning type automatic centrifuge which comprises a sealed centrifuge, wherein a centrifugal assembly is arranged in the centrifuge, and a driving shaft part penetrates through a centrifuge shell to drive the centrifugal assembly to rotate so as to realize centrifugal treatment on materials in the centrifugal assembly; the centrifugal machine is internally provided with a first pressurizing part for pressurizing the inside of the centrifugal machine, the centrifugal machine is provided with a second pressurizing part for pressurizing a gap between the driving shaft part and the contact surface of the shell of the centrifugal machine, the first pressurizing part and the second pressurizing part are filled with inactive gas for pressurizing, and the pressure intensity in the gap between the driving shaft part and the contact surface of the shell of the centrifugal machine is greater than the pressure intensity in the centrifugal machine. The centrifugal component in the centrifugal machine is driven to rotate by the driving shaft part, so that the centrifugal operation of materials is realized, the centrifugal machine is filled with inactive gas to achieve a pressurization effect, the oxygen concentration in the centrifugal machine is reduced, the safety during centrifugation is improved, and the safety performance is optimal when the oxygen concentration is reduced to be below an explosion limit value.

Description

Micro positive pressure air sealing type bag-turning type automatic centrifuge

Technical Field

The invention relates to the field of centrifugation, in particular to a micro positive pressure gas sealing type bag-turning type automatic centrifuge.

Background

The bag-turning type automatic centrifuge (hereinafter referred to as a bag-turning centrifuge) is used as intermittent solid-liquid separation equipment for centrifugal filtration, has the advantages of sealing, automatic discharge, no mechanical scraping, no residual filter cake, no damage to the shape of material crystals, high automation degree and the like, and is widely applied to the industries of pharmacy, chemical industry, biology, food and the like.

In actual production, a bag-turning centrifuge often needs to process special materials such as inflammable materials, explosive materials, volatile materials and toxic materials, for example, various solvents, energetic materials and the like in the chemical industry, when the dangerous materials are processed, how to change the oxygen content in the centrifuge to improve the safety of the centrifuge during operation needs to be considered, and a high requirement is provided for the sealing performance in the centrifuge, so that the structure of the centrifuge needs to be optimized urgently.

Disclosure of Invention

In order to avoid and overcome the technical problems in the prior art, the invention provides a micro positive pressure gas sealing type bag-turning type automatic centrifuge. The driving shaft part drives the centrifugal assembly in the centrifugal machine to rotate so as to realize centrifugal operation on materials, and the centrifugal machine is filled with inactive gas so as to achieve a pressurization effect, so that the oxygen concentration in the centrifugal machine is reduced, and the safety during the centrifugal operation is improved; when the centrifugal machine is pressurized, external air is prevented from entering the centrifugal machine; on the basis of high-pressure environment in the centrifugal machine, filling inactive gas into a gap between contact surfaces of a driving shaft and a shell of the centrifugal machine for pressurization treatment, so that the pressure in the gap between the driving shaft and the contact surfaces of the shell of the centrifugal machine is greater than the pressure in the centrifugal machine, and a pressure difference is formed to prevent materials in the centrifugal machine from entering a shaft system of the driving shaft.

In order to achieve the purpose, the invention provides the following technical scheme:

the micro positive pressure gas sealing type bag-turning type automatic centrifuge comprises a sealed centrifuge, wherein a centrifugal assembly is arranged in the centrifuge, and a driving shaft part penetrates through a centrifuge shell and drives the centrifugal assembly to rotate so as to realize centrifugal treatment on materials in the centrifugal assembly; the centrifugal machine is internally provided with a first pressurizing part for pressurizing the inside of the centrifugal machine, the centrifugal machine is also provided with a second pressurizing part for pressurizing a gap between the driving shaft part and the contact surface of the shell of the centrifugal machine, the first pressurizing part and the second pressurizing part are filled with inactive gas for pressurizing, and the pressure intensity in the gap between the driving shaft part and the contact surface of the shell of the centrifugal machine is greater than the pressure intensity in the centrifugal machine.

As a further scheme of the invention: a bearing seat is arranged on the shell of the centrifugal machine, and a support bearing is arranged in the bearing seat to support and fix the driving shaft part; and a bearing cavity air inlet is formed in the bearing seat so as to introduce inactive gas into the bearing cavity to realize a pressurization process, a gap between the contact surfaces of the driving shaft part and the centrifuge shell is communicated with the bearing cavity, and the bearing cavity air inlet is the second pressurization part.

As a still further scheme of the invention: the opening part of the bearing seat communicated with the inner cavity of the centrifugal machine is provided with labyrinth seals, and the labyrinth seals are arranged in a stepped mode along the axial direction of the driving shaft part.

As a still further scheme of the invention: the centrifugal assembly comprises a push disc and a rotary drum body which is matched with the push disc to rotate, and the push disc and the rotary drum body are coaxially arranged and enclose to form a centrifugal cavity; the push disc comprises a front push disc, a rear push disc and a connecting rod for connecting the front push disc and the rear push disc, the front push disc and the rotary drum body are in clearance fit, the contact surfaces of the front push disc and the rotary drum body are arranged in a sealing manner, and a turnover filter cloth for connecting the rear push disc and the rotary drum body is arranged between the rear push disc and the rotary drum body;

the driving shaft part comprises a driving shaft fixedly connected with the rotary drum body and a push disc shaft fixedly connected with the rear push disc; the driving shaft is a hollow sleeve, the push disc is sleeved in the driving shaft, the driving shaft and the push disc shaft synchronously rotate under the action of respective power mechanisms, and the push disc shaft can also axially move along the driving shaft under the action of the corresponding power mechanisms, so that the filter cloth is overturned and taken out or taken back to the rotary drum body.

As a still further scheme of the invention: the gap between the push disc shaft and the driving shaft is communicated with the bearing cavity or an external high-pressure inert gas source, and the pressure intensity in the gap between the push disc shaft and the driving shaft is greater than the pressure intensity in the centrifugal machine.

As a still further scheme of the invention: the centrifugal separator is characterized in that the push disc shaft is connected with the driving shaft through a sliding bearing, a push disc shaft sealing part is arranged on the push disc shaft to prevent materials in the centrifugal separator from entering a gap between the push disc shaft and the driving shaft, an isolation cavity is formed by enclosing the push disc shaft sealing part and the sliding bearing, and an air passage is formed in the driving shaft to enable the isolation cavity and the bearing cavity to be communicated.

As a still further scheme of the invention: the centrifugal machine shell is in an open shape, the rotating drum body and the opening part of the centrifugal machine shell form clearance fit, the contact surface is arranged in a sealing mode, and the rotating drum body and the centrifugal machine shell are enclosed to form a mother liquid collecting cavity; the centrifugal machine shell is provided with a purging port for purging materials bonded on a sealing surface between the rotary drum body and the centrifugal machine shell; and a water retaining ring coaxial with the driving shaft is arranged on the shell wall of the centrifuge shell at the side of the bearing seat.

As a still further scheme of the invention: the rotary drum body and the push disc are both arranged in the sealed shell; during centrifugal operation, the rotary drum body, the push disc and the shell are matched to divide an inner cavity of the shell into two parts, wherein one side of the shell is a centrifugal machine, the other side of the shell is a filter cake collecting cavity, and the shell is a shell of the centrifugal machine; the shell is provided with an air inlet for introducing high-pressure inactive gas into the centrifuge and the filter cake collecting cavity, and the air inlet is a first pressurization part; the inert gas is used to reduce the oxygen concentration within the centrifuge below the explosion limit.

As a still further scheme of the invention: a feed pipe coaxial with the driving shaft sequentially penetrates through the shell and the forward push disc to be communicated with the centrifugal cavity, so that suspension liquid materials are introduced into the centrifugal cavity, and the contact surface of the feed pipe and the forward push disc is arranged in a sealing manner; a filter cake outlet is arranged at the bottom of the filter cake collecting cavity in the shell and is controlled to be opened and closed through a discharge valve; the shell is provided with a recovery port, the recovery port is connected with one end of a gas recovery pipe, and the other end of the gas recovery pipe is communicated with a gas phase outlet of the gas-liquid separator to recover inactive gas; and a pressure sensor is arranged on the gas recovery pipe.

As a still further scheme of the invention: the centrifugal machine is provided with a gas-liquid separator, the gas-liquid separator comprises a barrel body communicated with a mother liquid collecting cavity in the centrifugal machine, the bottom of the barrel body is a conical liquid outlet controlled to be opened and closed by a liquid outlet valve, and the top of the barrel body is provided with a gas outlet for discharging and recycling inactive gas; the centrifugal machine is characterized in that a gas-liquid inlet is formed in the barrel, a gas-liquid outlet communicated with the mother liquid collecting cavity is formed in the centrifugal machine, the gas-liquid outlet is gradually narrowed along a pipe orifice in the direction away from the centrifugal machine, and the gas-liquid outlet is communicated with the gas-liquid inlet.

Compared with the prior art, the invention has the beneficial effects that:

1. the driving shaft part drives the centrifugal assembly in the centrifugal machine to rotate so as to realize centrifugal operation on materials, and the centrifugal machine is filled with inactive gas so as to achieve a pressurization effect, so that the oxygen concentration in the centrifugal machine is reduced, and the safety during the centrifugal operation is improved; it should be noted that as long as the air pressure in the centrifuge is increased and the oxygen content is decreased, the safety of the centrifuge in operation is improved. Of course, the safety performance of the centrifuge is optimized when the amount of inert gas charged reduces the oxygen concentration in the centrifuge below the explosion limit. When the centrifugal machine is pressurized, external air is prevented from entering the centrifugal machine; filling inactive gas into a gap between contact surfaces of a driving shaft part and a centrifugal machine shell for pressurization treatment on the basis of a high-pressure environment in the centrifugal machine, so that the pressure intensity in the gap between the driving shaft part and the centrifugal machine shell contact surface is greater than the pressure intensity in the centrifugal machine, and a pressure intensity difference is formed to prevent materials in the centrifugal machine from entering a shaft system of the driving shaft part; the main functions of the inactive gas in the invention are that the pressure in the centrifuge and at the opening of the centrifuge can be enhanced, the oxygen content in the centrifuge can be reduced, and the inactive gas can not react with the materials in the centrifuge. Generally, inert gases and nitrogen are preferred as the inert gas in the present invention.

2. The centrifugal machine is provided with the bearing seat, and the support bearing is arranged in the bearing seat to fix the driving shaft part; high-pressure inactive gas is introduced into the bearing cavity through the bearing cavity gas inlet, so that the high-pressure inactive gas can flow into a gap between the contact surface of the driving shaft and the shell of the centrifugal machine, and the pressurization process is realized; the labyrinth seal is arranged at the opening part of the bearing seat communicated with the inner cavity of the centrifugal machine, so that the labyrinth seal is arranged along the axial direction of the driving shaft in a stepped manner, and a step-by-step throttling effect is generated through the change of the clearance, thereby achieving the best sealing effect.

3. The invention realizes the processes of centrifugation and unloading by the matching of the rotary drum body and the push disc, and the two are enclosed to form a centrifugal cavity for providing a centrifugal environment; through the action of the power mechanism, the push disc shaft drives the push disc to move axially along the driving shaft, and the filter cloth is taken out of or back to the rotary drum body, so that the switching of the centrifugation and unloading processes can be realized.

4. The driving shaft of the invention is hollow inside to provide the installation environment of the push disc shaft; make push away the sealed portion of set shaft and slide bearing enclose to close and form and keep apart the chamber, through seting up the air flue in the drive shaft, can realize keeping apart the intercommunication in chamber and bearing chamber to in introducing the shafting of push away set shaft with high-pressure inactive gas, be in high-pressure state in making the clearance between push away set shaft and the drive shaft, prevent in the material gets into the shafting of push away set shaft, prevent that material and shafting friction from generating heat, improved centrifugal process's factor of safety.

5. The rotary drum body and the push disc are matched with the shell during centrifugation, the inner cavity of the shell is divided into two parts, one side is provided with the centrifuge, the other side is provided with the filter cake collecting cavity, and the filter cake can be directly discharged into the filter cake collecting cavity in the shell after the centrifugation is finished; the filter cake collecting cavity is also filled with inactive gas for pressurization treatment, so that the oxygen content in the shell is ensured to be reduced below the explosion limit value, and the safety during centrifugal operation is improved. By introducing the feeding pipe, suspension materials can be continuously supplemented while the centrifugal operation is performed, the centrifugal operation can be performed for a long time without stopping, and the centrifugal efficiency is improved.

6. The invention has the advantages that the purging port is arranged to purge the sealing parts at the two sides of the contact surface of the rotary drum body and the shell, and the materials bonded on the sealing surface are purged, so that the service life of the seal is prolonged; the arrangement of the water retaining ring has a blocking effect on the mother liquor thrown out of the rotary drum body, so that the mother liquor can smoothly flow into the mother liquor collecting cavity, and the mother liquor is prevented from scattering on the rear cover plate to cause pressure on sealing between shafting.

7. According to the invention, the gas-liquid separator is arranged to be communicated with the mother liquid collecting cavity, and after mother liquid in the mother liquid collecting cavity is thrown into the gas-liquid separator, the mother liquid flows downwards under the influence of gravity and is collected or discharged; the inactive gas mixed in the mother liquid is discharged upwards and returns back to the shell through the gas recovery pipe, so that the cyclic utilization of the inactive gas is realized, the whole device is ensured to be kept in a preset pressure state, and the inactive gas is also kept in a balanced state.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a schematic structural diagram of the invention in a discharging state.

Fig. 4 is an enlarged schematic view of a portion a of fig. 1.

Fig. 5 is an enlarged schematic view of fig. 1 at B.

In the figure: 1. a discharge valve; 2. a filter cake outlet; 3. a filter cake collection chamber; 4. pushing the disc; 41. a forward push plate; 42. a rear push plate; 43. a connecting rod; 5. a first static seal; 6. a suspension material; 7. a feed pipe; 8. a housing; 81. a rear cover plate; 9. a recovery port; 10. a gas recovery pipe; 11. an air inlet; 12. a second static seal; 13. conical sealing; 14. rotating the drum body; 15. filtering cloth; 16. a water retaining ring; 17. labyrinth sealing; 171. a first radially labyrinth seal; 172. a second axial straight-through labyrinth seal; 173. a third radial labyrinth seal; 18. packing the packing; 181. a left packing set; 182. a right packing set; 19. a support bearing; 20. a bearing cavity air inlet; 21. a bearing seat; 22. double-layer oil seal; 23. a filter cake; 24. a mother liquor collection chamber; 25. an airway; 26. a sliding bearing; 27. a sleeve; 28. an isolation chamber; 29. pressing a ring; 30. a total air inlet; 31. a pressure sensor; 32. a gas-liquid separator; 321. a barrel; 3211. a conical liquid outlet; 3212. a liquid outlet valve; 322. a gas-liquid inlet; 323. an air outlet; 33. a gas-liquid outlet; 34. a purge port; 35. a drive shaft; 36. a push disk shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, in the embodiment of the present invention, the micro positive pressure gas sealing type bag-turning type automatic centrifuge includes a casing 8 disposed in a sealing manner, one side of the casing 8 is opened, and the opening is sealed by a rear cover plate 81. The shell 8 is internally provided with a rotary drum body 14 and a push disc 4, and when the front end of the push disc 4 is in clearance fit with the front end of the rotary drum body 14, the push disc 4, the rotary drum body 14, the shell 8 and a rear cover plate 81 are enclosed together to form a centrifuge; the push disc 4 comprises a front push disc 41, a rear push disc 42 and a connecting rod 43 connecting the front push disc 41 and the rear push disc 42, and the contact surface of the push disc 4 and the rotary drum body 14 is provided with a second static seal 12 to realize a sealing effect. The second static seal 12 is made of various rubbers such as fluororubber or polytetrafluoroethylene PTFE, and is selected according to material characteristics, and the shape is preferably annular.

Wherein the push plate 4 and the rotary drum body 14 enclose to form a centrifugal cavity, a filter cloth 15 for intercepting solid residues during centrifugal operation is arranged in the centrifugal cavity, and the rotary drum body 14, the shell 8 and the rear cover plate 811 enclose to form a mother liquor collecting cavity 24.

An extension section which extends along the radial direction in the shell 8 to form a ring shape is in clearance fit with the front end of the rotary drum body 14, and the contact surface is arranged in a sealing way; conical seals 13 are preferably arranged on both sides of the contact surface of the rotary drum body 14 and the shell 8 to realize a sealing function, and the tips of the two conical seals 13 are attached to the contact surface of the shell body 8 and the rotary drum body 14. Meanwhile, the shell 8 is provided with a purging port 34 for purging the materials bonded on the two conical seals 13.

The edge of the filter cloth 15 is fixed at the front end of the rotary drum body 14, and the end of the push disc shaft 36 of the push disc 4 is fixedly connected with the cloth surface of the filter cloth 15. The push disc 4 cooperates with the filter cloth 15 to realize the following two working processes:

during centrifugal operation, the corresponding power mechanisms drive the push disc shaft 36 to move along the axial direction, the push disc 4 is driven to push the filter cloth into the rotary drum body 14, the rotary drum body 14 and the push disc 4 synchronously rotate under the action of the respective power mechanisms, the suspension liquid material 6 is centrifuged in the centrifugal cavity, the filter cloth 15 intercepts solid residues to form a filter cake 23, and mother liquor in the suspension liquid material 6 penetrates through the filter cloth 15, passes through holes in the rotary drum body 14 and enters the mother liquor collecting cavity 24;

after centrifugation is finished, the corresponding power mechanism drives the push disc shaft 36 to move along the axial direction, so that the push disc shaft 36 and the push disc drive the filter cloth 15 to retreat from the centrifugal cavity, the inner filtering surface of the filter cloth 15 is turned and exposed in the filter cake collecting cavity 3, and the filter cake 23 falls into the filter cake collecting cavity 3 under the action of gravity.

The areas except the centrifuge in the shell 8 are filter cake collecting cavities 3, two air inlets 11 are arranged on the shell 8 and are respectively communicated with the filter cake collecting cavities 3 and a mother liquid collecting cavity 24, inactive gas is filled into the two cavities, and the pressure of the filled gas is kept at 3-4 KPa. The main functions of the inactive gas in the invention are that the pressure in the centrifuge and at the opening of the centrifuge can be enhanced, the oxygen content in the centrifuge can be reduced, and the inactive gas can not react with the materials in the centrifuge. Generally, inert gases and nitrogen are preferred as the inert gas in the present invention, and the concentration of oxygen in the centrifuge can be reduced to the explosion limit or less by continuously filling the inert gas. The two air inlets 11 can be communicated through the main air inlet 30, so that air is inflated simultaneously and the pressure is kept consistent; the two air inlets 11 may also be inflated separately.

The high pressure in the invention means that the pressure of the charged inert gas is at least larger than the pressure in the centrifuge when the centrifuge normally works, and of course, the pressure of the charged inert gas can be determined according to the actual production condition.

The drum body 14 is driven to rotate by a drive shaft 35, and the push plate 4 is driven to rotate by a push plate shaft 36. The driving shaft 35 and the pushing disc shaft 36 are coaxially arranged, the driving shaft 35 is a central sleeve for the pushing disc shaft 36 to be installed in, and one end of the pushing disc shaft 36 penetrates through the shaft cavity to be connected with a corresponding power mechanism.

The rear cover plate 81 extends axially along the driving shaft 35 to form a bearing seat 21, and a supporting bearing 19 is mounted in the bearing seat 21 to support and fix the driving shaft. The two support bearings 19 are preferably arranged on the left side and the right side in the bearing seat 21 to form double-point support, and the two support bearings 19 and the bearing seat 21 enclose to form a bearing cavity; in actual operation, the number of the support bearings 19 is not limited.

And a double-layer oil seal 22 is fixed on one side of each support bearing 19 away from the bearing cavity, and each double-layer oil seal 22 comprises a left oil seal and a right oil seal, and the lips of the left oil seal and the right oil seal are back to back.

In order to prevent materials in the centrifugal machine from entering a bearing cavity, a bearing cavity air inlet 20 is preferably arranged on a bearing seat 21, so that inactive gas is introduced into the bearing cavity, the pressure of the charged gas is kept at 3-4KPa + 0.2-0.5 KPa, and the inactive gas is preferably nitrogen gas; the same sealing effect can be achieved by otherwise introducing high pressure inert gas directly into the gap between the contact surfaces of the drive shaft 35 and the housing 8.

In order to improve the sealing effect, the bearing seat 21 and the opening part communicated with the inner cavity of the centrifuge are provided with labyrinth seals 17 which are arranged in a stepped mode along the axial direction of the driving shaft 35, and the labyrinth seals 17 are positioned between the supporting bearing 19 and the centrifuge. In the preferred embodiment, labyrinth seal 17 includes a first radial labyrinth seal 171, a second axial straight-through labyrinth seal 172, and a third radial labyrinth seal 173, which are connected in series in a direction away from the centrifuge. In practice, the number of labyrinth seals 17 is not limited.

A sliding bearing 26 is arranged between the push disc shaft 36 and the driving shaft 35 to support and position the push disc shaft 35; and a packing 18 is fixed in a gap between the push disc shaft 36 and one side of the driving shaft 35 adjacent to the centrifuge so as to realize a sealing effect.

The packing 18 comprises a left packing 181 and a right packing 182, and a sleeve 27 surrounding the thrust plate shaft is clamped and fixed between the left packing 181 and the right packing 182; one end of the right packing set 182, which is far away from the isolation cavity 28, is abutted against the sliding bearing 26, and one end of the left packing set 181, which is far away from the isolation cavity 28, is pressed and fixed through the pressing ring 29. The left packing 181, the right packing 182 and the sleeve 27 enclose to form an isolation cavity 28, the driving shaft 35 is provided with an air passage 25 to communicate the isolation cavity 28 with the bearing cavity, and high-pressure inactive gas is introduced into a gap between the push disc shaft and the driving shaft.

In the actual use process, the packing 18 is replaced by any seal, so that an isolation cavity 28 is formed by enclosing any seal and the sliding bearing 26, and the isolation cavity 28 and the bearing cavity are communicated with each other similarly; or it is equally feasible to place the isolation chamber 28 in communication with an external source of high pressure inert gas.

A feed pipe 7 coaxial with the drive shaft 35 is in turn passed through the housing 8 and the forward thrust disc 41 to communicate with the centrifugal chamber for introducing the suspension material 6 into the chamber, the contact surface of the feed pipe 7 with the forward thrust disc 41 being sealingly arranged, typically with a first static seal 5. The material of the 1 st static seal 5 is various rubbers such as fluororubber and the like or polytetrafluoroethylene PTFE, and the shape is preferably annular according to the material characteristics.

The shell wall of the shell 8 on the side of the bearing seat 21 is provided with a water retaining ring 16 which is coaxial with the driving shaft 35 and has a blocking effect on the mother liquor so as to prevent the mother liquor from flowing onto the rear cover plate 81 to influence the sealing structure.

A filter cake outlet 2 is arranged at the bottom of the filter cake collecting cavity 3 in the shell 8, the opening and closing of the filter cake outlet 2 are controlled by a discharge valve 1, and the discharge valve 1 is in a closed state in the centrifugal process; after the centrifugation is finished, the filter cake in the centrifuge is discharged into the filter cake collecting cavity 3.

The gas-liquid separator 32 comprises a cylinder 321 communicated with the mother liquor collecting cavity 24 in the centrifuge, the cylinder 321 is a vertical cylinder, the bottom of the cylinder 321 is a conical liquid outlet 3211 opened and closed by controlling a liquid outlet valve 3212, and the top of the cylinder 321 is provided with a gas outlet 323 for discharging and recycling inactive gas; a gas-liquid inlet 322 is tangentially arranged on the cylinder 321, a gas-liquid outlet 33 communicated with the mother liquid collecting cavity 24 is tangentially arranged on the shell 8, the gas-liquid outlet 33 is gradually narrowed along a pipe orifice far away from the centrifuge, and the gas-liquid outlet 33 is communicated with the gas-liquid inlet 322.

A recovery port 9 is arranged on the shell 8, the recovery port 9 is connected with one end of a gas recovery pipe 10, and the other end of the gas recovery pipe 10 is connected with a gas outlet 323 of the gas-liquid separator 32 to recover inactive gas; the gas recovery pipe 10 is provided with a pressure sensor 31 for monitoring the pressure in real time, and when the pressure in the shell 8 is lower than a set value, the gas is automatically supplied to the gas inlet 11; when the pressure sensor 31 senses that the pressure value reaches the set value, the air inlet 11 stops air inlet.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The micro positive pressure gas sealing type bag-turning type automatic centrifuge is characterized by comprising a sealed centrifuge, wherein a centrifugal assembly is arranged in the centrifuge, and a driving shaft part penetrates through a centrifuge shell and drives the centrifugal assembly to rotate so as to realize centrifugal treatment on materials in the centrifugal assembly; the centrifugal machine is internally provided with a first pressurizing part for pressurizing the inside of the centrifugal machine, the centrifugal machine is also provided with a second pressurizing part for pressurizing a gap between the driving shaft part and the contact surface of the shell of the centrifugal machine, the first pressurizing part and the second pressurizing part are filled with inactive gas for pressurizing, and the pressure intensity in the gap between the driving shaft part and the contact surface of the shell of the centrifugal machine is greater than the pressure intensity in the centrifugal machine.

2. The micro positive pressure gas sealing type bag-turning type automatic centrifuge according to claim 1, wherein a bearing seat (21) is arranged on the centrifuge housing, and a support bearing (19) is arranged in the bearing seat (21) to support and fix the driving shaft part; and a bearing cavity air inlet (20) is formed in the bearing seat (21) to introduce inactive gas into the bearing cavity to realize a pressurization process, a gap between the contact surface of the driving shaft part and the centrifugal machine shell is communicated with the bearing cavity, and the bearing cavity air inlet (20) is a second pressurization part.

3. The micro positive pressure gas sealing type bag-turning type automatic centrifuge according to claim 2, wherein a labyrinth seal (17) is arranged at a port of the bearing seat (21) communicated with the inner cavity of the centrifuge, and the labyrinth seal (17) is arranged in a stepped manner along the axial direction of the driving shaft part.

4. The micro-positive pressure gas sealing type bag-turning automatic centrifuge according to claim 2 or 3, wherein the centrifugal assembly comprises a push disc (4) and a rotary drum body (14) which is matched with the push disc (4) to rotate, and the push disc (4) and the rotary drum body (14) are coaxially arranged and enclose to form a centrifugal cavity; the push disc (4) comprises a front push disc (41), a rear push disc (42) and a connecting rod (43) for connecting the front push disc (41) and the rear push disc (42), the front push disc (41) is in clearance fit with the rotary drum body (14), the contact surface of the front push disc and the rotary drum body is sealed, and a reversible filter cloth (15) for connecting the rear push disc (42) and the rotary drum body (14) is arranged between the rear push disc (42) and the rotary drum body;

the driving shaft part comprises a driving shaft (35) fixedly connected with the rotary drum body (14) and a push disc shaft (36) fixedly connected with the rear push disc (42); the filter cloth overturning device is characterized in that the driving shaft (35) is a hollow sleeve, the disc pushing shaft (36) is sleeved in the driving shaft (35), the driving shaft (35) and the disc pushing shaft (36) synchronously rotate under the action of respective power mechanisms, and the disc pushing shaft (36) can axially move along the driving shaft (35) under the action of the corresponding power mechanisms, so that the filter cloth (15) is overturned and taken out or the rotary drum body (14) is taken.

5. The micro-positive pressure gas sealing type bag-turning type automatic centrifuge according to claim 4, wherein a gap between the push disk shaft (36) and the drive shaft (35) is communicated with a bearing chamber or an externally connected high-pressure inert gas source, and a pressure in the gap between the push disk shaft (36) and the drive shaft (35) is higher than a pressure in the centrifuge.

6. The micro-positive pressure gas sealing type bag-turning type automatic centrifuge as claimed in claim 5, wherein the push disc shaft (36) and the driving shaft (35) are connected through a sliding bearing (26), a push disc shaft sealing portion is arranged on the push disc shaft (36) to prevent materials in the centrifuge from entering a gap between the push disc shaft (36) and the driving shaft (35), an isolation cavity (28) is formed by enclosing between the push disc shaft sealing portion and the sliding bearing (26), and an air passage (25) is formed in the driving shaft (35) to communicate the isolation cavity (28) with the bearing cavity.

7. The micro positive pressure gas sealing type bag-turning type automatic centrifuge according to claim 4, wherein the centrifuge housing is open, the rotary drum body (14) and the opening part of the centrifuge housing form clearance fit and the contact surface is arranged in a sealing way, and the rotary drum body (14) and the centrifuge housing enclose to form a mother liquid collecting cavity (24); the shell of the centrifuge is provided with a purging port (34) for purging materials bonded on the sealing surface between the rotary drum body (14) and the shell of the centrifuge; and a water retaining ring (16) which is coaxial with the driving shaft (35) is arranged on the shell wall of the centrifuge shell on the side of the bearing seat (21).

8. The micro-positive pressure gas seal type bag-turning automatic centrifuge according to claim 4, wherein the rotary drum body (14) and the push disk (4) are both disposed in a sealed housing (8); during centrifugal operation, the rotary drum body (14), the push disc (4) and the shell (8) are matched to divide the inner cavity of the shell (8) into two parts, wherein one side is a centrifugal machine, the other side is a filter cake collecting cavity (3), and the shell (8) is a shell of the centrifugal machine; the shell (8) is provided with an air inlet (11) for introducing high-pressure inactive gas into the centrifuge and the filter cake collecting cavity (3), and the air inlet (11) is a first pressurization part; the inert gas is used to reduce the oxygen concentration within the centrifuge below the explosion limit.

9. The micro-positive pressure gas seal type bag-turning automatic centrifuge according to claim 8, characterized in that a feed pipe (7) coaxial with the drive shaft (35) sequentially passes through the housing (8) and the forward push disk (41) to communicate with the centrifugal chamber, thereby introducing the suspension material (6) into the centrifugal chamber, and the contact surface of the feed pipe (7) and the forward push disk (41) is arranged in a sealing manner; a filter cake outlet (2) is formed in the bottom of the filter cake collecting cavity (3) in the shell (8), and the opening and closing of the filter cake outlet (2) are controlled through a discharge valve (1); a recovery port (9) is formed in the shell (8), the recovery port (9) is connected with one end of a gas recovery pipe (10), and the other end of the gas recovery pipe (10) is communicated with a gas phase outlet of the gas-liquid separator (32) to recover inactive gas; and a pressure sensor (31) is arranged on the gas recovery pipe (10).

10. The micro positive pressure gas sealing type bag-turning type automatic centrifuge as claimed in any one of claims 1 to 3, wherein the centrifuge is provided with a gas-liquid separator (32), the gas-liquid separator (32) comprises a cylinder (321) communicated with a mother liquid collecting cavity (24) in the centrifuge, the bottom of the cylinder (321) is a conical liquid outlet (3211) controlled to be opened and closed by a liquid outlet valve (3212), and the top of the cylinder (321) is provided with a gas outlet (323) for discharging and recovering inactive gas; the barrel (321) is provided with a gas-liquid inlet (322), the centrifuge is provided with a gas-liquid outlet (33) communicated with the mother liquid collecting cavity (24), the gas-liquid outlet (33) is gradually narrowed along the direction away from the centrifuge, and the gas-liquid outlet (33) is communicated with the gas-liquid inlet (322).