CN116531799A - Centrifugal extraction machine and centrifugal extraction system comprising same - Google Patents

Abstract

The invention provides a centrifugal extractor and a centrifugal extraction system comprising the centrifugal extractor. The centrifugal extractor includes a shell, a drum and a centrifugal shaft, the shell is arranged outside the drum, and the centrifugal shaft is fixedly connected to the drum; the centrifugal extractor also includes a magnetic suspension bearing The magnetic suspension bearing includes a first radial magnetic suspension bearing, which is arranged above the casing and on the upper part of the centrifugal shaft; the magnetic suspension bearing also includes a second radial magnetic suspension bearing, which is arranged at the lower end of the casing and is located at the lower part of the drum; the motor is arranged on the casing external. The above-mentioned centrifugal extraction machine and the centrifugal extraction system including it, the driving mechanism does not contact the shaft system, and the shaft seal is omitted, so as to avoid the leakage of the internal medium and the introduction of pollution to the external environment; the magnetic suspension bearing exerts a balanced magnetic force on the centrifugal shaft, thereby avoiding Contact friction produces wear, which improves the operation stability of the centrifugal extractor, thereby increasing the service life of the equipment, prolonging the continuous working time of the system, and stabilizing the cascade centrifugal extraction process.

Description

Centrifugal extractor and centrifugal extraction system comprising same

technical field

The invention relates to the field of liquid-liquid centrifugal extraction, in particular to a centrifugal extraction machine and a centrifugal extraction system comprising the same.

Background technique

Centrifugal extractor is a kind of liquid-liquid extraction equipment, which has the characteristics of fast mass transfer. With this equipment, liquid-liquid two-phase mixing, mass transfer, extraction, washing, separation, etc. can be realized quickly and efficiently, and the equilibrium time can be greatly shortened. , improve efficiency; at the same time, the centrifugal extractor has a small demand for organic phase materials and less loss. Centrifugal extractors are widely used in chemical industry, medicine, petroleum, metallurgy, nuclear energy, wastewater treatment and other fields.

During the extraction and separation process of the centrifugal extractor, volatile, flammable, explosive, toxic and harmful organic solvents are commonly used, and must be strictly prevented from leaking. There are some applications where the release of hazardous gases will be exacerbated. For example, the long-term continuous operation of the centrifugal extractor leads to an increase in the temperature of the extractant and an increase in volatility; some special extraction systems must work in an air-isolated environment, and need to be fed with inert gas and maintain a certain positive pressure; some extraction systems It must work efficiently under high temperature and high pressure.

For some materials with a low single-stage separation coefficient, in order to increase the extraction rate, multiple centrifugal extractors must be connected in series to achieve cumulative enrichment. In this type of system, if a centrifugal extractor is abnormal, it will break the extraction balance of the entire system and affect the entire extraction and enrichment process.

The driving mechanism of traditional centrifugal extractors must be in direct or indirect contact with the shafting. Mechanical bearings are used, and mechanical seals are installed between the drive mechanism and the rotor. The parts below the shaft seal are sealed in the equipment housing, and an inert gas of a certain pressure is introduced into the space below the shaft seal.

This design has the following disadvantages.

(1) The shaft seal and the casing together constitute the pressure boundary of the extraction system. The shaft seal must not only ensure that there is a proper gap between the dynamic and static parts, but also prevent gas from leaking from the gap. It is difficult to maintain an ideal sealing effect for a long time, and it is suitable for volatile and flammable Explosive, toxic and harmful organic extraction agents, especially micro-positive pressure, high-pressure, and high-temperature extraction systems cannot be effectively sealed. External forced ventilation facilities must be installed. Although the workplace and personnel can be protected, it is still difficult to avoid the cost of solvent loss and environmental protection of exhaust gas.

(2) During operation, the pressure in the casing must be properly controlled. If the pressure is too high, the leakage will be accelerated, and if the pressure is too low, the isolation of the extraction system from the air cannot be guaranteed.

(3) The shaft seal is closely attached to the shaft, wears quickly, and has a short service life, which reduces the reliability of the equipment, limits the continuous running time of the system, and affects the process stability.

(4) The sealing performance of the shaft seal must be monitored in real time during operation. Once the shaft seal is found to be invalid, immediately cut off the connection between the faulty centrifugal extractor and the system, remove the gas pressure in the machine, and empty the extraction agent. The maintenance cost is high .

In order to popularize and apply the green and stable cascade centrifugal extraction process, it is urgent to effectively prevent the leakage of the extraction agent and prolong the continuous operation time of the centrifugal extractor.

Contents of the invention

The technical problem to be solved by the present invention is to provide a centrifugal extractor and a centrifugal extraction system including the centrifugal extractor in order to overcome the defects of poor sealing, easy wear of the bearing and short continuous working time in the prior art.

The present invention solves the above technical problems through the following technical solutions:

The present invention provides a centrifugal extractor, comprising a shell, a drum and a centrifugal shaft, the shell is arranged outside the drum, the centrifugal shaft is fixedly connected to the drum, and the centrifugal extractor also includes:

a magnetic suspension bearing, the magnetic suspension bearing is used to generate radial and axial magnetic forces along the centrifugal shaft and the rotating drum, so as to limit the displacement of the centrifugal shaft and the rotating drum;

The magnetic suspension bearing includes a first radial magnetic suspension bearing, the first radial magnetic suspension bearing is arranged above the housing and on the upper part of the centrifugal shaft, and is used to limit the radial displacement of the upper part of the centrifugal shaft; The first radial magnetic suspension bearing includes a first stator and a first rotor, the first rotor is arranged on the centrifugal shaft, and the first stator is arranged on the outer peripheral side of the first rotor;

The magnetic suspension bearing also includes a second radial magnetic suspension bearing, the second radial magnetic suspension bearing is arranged at the lower end of the casing and at the lower part of the drum, and is used to limit the radial displacement of the drum; The second radial magnetic suspension bearing includes a second stator and a second rotor, the second rotor is arranged on the outer peripheral side of the lower part of the drum, and the second stator is arranged on the outer peripheral side of the second rotor;

A motor, the motor is arranged outside the casing and is used to drive the centrifugal shaft to rotate.

In this technical solution, the centrifugal extractor adopts the above-mentioned structure, which isolates the internal and external atmosphere of the centrifugal extractor, avoids the leakage of the extracted raw materials, and limits the displacement of the centrifugal shaft and the drum through the magnetic suspension bearing, and the bearing and the shaft do not contact and have no friction. Significantly improve the life of the bearing and prolong the continuous working time of the centrifugal extractor. Set the magnetic suspension bearing on the drum to limit its radial displacement, which can improve the bearing capacity of the drum, increase the stability and load, and reduce the extraction machine. of the overall volume.

Preferably, the motor includes a motor stator and a motor rotor, the motor rotor is arranged on the centrifugal shaft, and the motor stator is arranged on the outer peripheral side of the motor rotor.

In this technical solution, the centrifugal shaft is driven to rotate by controlling the electromagnetic force generated by the electrification between the motor stator and the motor rotor, which greatly reduces the friction force during operation and improves the sealing performance of the equipment at the same time.

Preferably, the centrifugal extractor further includes a magnetic coupling, the magnetic coupling includes an outer magnet and an inner magnet, the inner magnet is fixed on the centrifugal shaft, the outer magnet is arranged on the inner The outer peripheral side of the magnet is electrically connected with the motor, and the magnetic coupling is used to transmit torque to the centrifugal shaft to drive the centrifugal shaft to rotate.

In this technical solution, the motor is not in direct contact with the centrifugal shaft and the drum, and the torque is transmitted through the magnetic coupling to drive the centrifugal shaft to rotate, thereby eliminating the need for a sealing device for the motor and expanding the selection range of the motor.

Preferably, the inner magnet is arranged axially on the outer surface of the centrifugal shaft.

In the technical solution, the inner magnet has a relatively large area, which facilitates the smooth transmission of torque.

Preferably, the magnetic coupling further includes a shield, and the shield is arranged between the outer magnet and the inner magnet.

In the technical solution, the shielding cover separates the outer magnet and the inner magnet, avoiding the leakage of the raw material to be extracted, and improving the sealing performance of the equipment.

Preferably, the magnetic suspension bearing further includes an axial magnetic suspension bearing, the axial magnetic suspension bearing is arranged between the first radial magnetic suspension bearing and the housing, and the axial magnetic suspension bearing includes a third stator; A force-receiving part is provided on the centrifugal shaft, and the third stator is arranged on both sides of the force-receiving part for limiting the axial displacement of the centrifugal shaft.

In the technical solution, there is a magnetic force between the third stator and the force-receiving part, so that the centrifugal shaft is suspended in the axial direction, and the friction force during operation is greatly reduced.

Preferably, the centrifugal extractor further includes an upper shell, and the first radial magnetic suspension bearing and the axial magnetic suspension bearing are located in the upper shell.

In this technical solution, the upper shell surrounds the first radial magnetic suspension bearing and the axial magnetic suspension bearing, so that they operate in a closed environment and avoid contamination.

Preferably, a first sealing ring is provided between the upper shell and the outer shell, and the centrifugal shaft passes through the first sealing ring.

In this technical solution, the first sealing ring isolates the shell and the upper shell and seals the inner chamber, so as to avoid leakage of the raw material to be extracted.

Preferably, a cover plate is provided on the upper part of the upper case, and a second sealing ring is provided between the upper case and the cover plate.

In this technical solution, the second sealing ring seals the upper shell to avoid leakage of the raw material to be extracted.

Preferably, the centrifugal extractor further includes an upper shell, the motor is arranged above the magnetic coupling, the motor is arranged on a motor base, and the magnetic coupling is arranged above the upper shell In the motor seat, a second sealing ring is arranged between the magnetic coupling and the upper shell.

In this technical solution, the second sealing ring isolates the magnetic coupling and the upper shell and seals the inner chamber to avoid leakage of the raw material to be extracted.

Preferably, the centrifugal extractor further includes an axial position sensor, the axial position sensor is arranged on the outer peripheral side of the axial magnetic suspension bearing, and the axial position sensor is used to monitor the axial direction of the centrifugal shaft. displacement.

In this technical solution, the axial position sensor monitors the axial displacement of the centrifugal shaft, which facilitates timely adjustment of the axial magnetic suspension bearing and avoids increased friction.

Preferably, the centrifugal extractor further includes a first radial position sensor, the first radial position sensor is arranged above the first radial magnetic suspension bearing, and is used to monitor the radial direction of the upper part of the centrifugal shaft. displacement.

In this technical solution, the first radial position sensor monitors the radial displacement of the centrifugal shaft, which facilitates timely adjustment of the first radial magnetic suspension bearing and avoids increased friction.

Preferably, the centrifugal extractor further includes a second radial position sensor, the second radial position sensor is arranged above the second radial magnetic suspension bearing, and is used to monitor the radial direction of the lower part of the centrifugal shaft. displacement.

In this technical solution, the second radial position sensor monitors the radial displacement of the centrifugal shaft, which facilitates timely adjustment of the second radial magnetic suspension bearing and avoids increased friction.

Preferably, the bottom of the drum is provided with a first feed port and a feed channel, the centrifugal shaft passes through the first feed port, and the centrifuge shaft passes through the first feed port There is a stirring section below.

In the technical solution, the stirring part fully stirs the liquid entering the first feeding port, thereby facilitating subsequent processing.

Preferably, the bottom of the drum is provided with a first feed port, and the side of the shell is provided with a second feed port, and the first feed port and the second feed port are connected by the The rotating drum and the casing define a feeding channel, and guide vanes are arranged on the casing below the first feeding port.

In this technical solution, the feed liquid is fully agitated when flowing in the feed channel and guided into the drum, which is convenient for subsequent treatment.

Preferably, the upper part of the housing is provided with a heavy phase collection chamber, a heavy phase outlet and a heavy phase weir; the lower part of the heavy phase outlet is provided with a light phase collection chamber, and a light phase collection chamber is provided on the light phase collection chamber. outlet; the upper part of the light phase collection chamber is provided with a light phase weir.

In this technical solution, the components in the feed liquid flow out from different outlets respectively after being centrifuged in the drum, so as to facilitate collection and utilization.

The present invention also provides a centrifugal extraction system, which includes multiple centrifugal extractors as described above, and multiple centrifugal extractors are connected in series and/or in parallel.

In this technical solution, when some centrifugal extraction machines in the centrifugal extraction system fail, they can be quickly switched to other equipment to continue working without suspending the operation of the entire centrifugal extraction system for maintenance, thereby greatly improving the reliability of the centrifugal extraction system sex and work efficiency.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The positive progress effect of the present invention is:

The above-mentioned centrifugal extractor and the centrifugal extraction system including it, the driving mechanism does not contact the shaft system, and the shaft seal is omitted, so that the internal atmosphere of the centrifugal extractor is isolated from the external environment, and the leakage of the internal medium and the introduction of pollution to the external environment are avoided; the magnetic levitation The bearing exerts a balanced magnetic force on the centrifugal shaft, and prevents the centrifugal shaft from contacting other parts in the axial and radial directions. When the centrifugal shaft and the drum are working, all parts are evenly stressed, thereby avoiding contact friction and wear, which is convenient for online control The vibration of the rotor improves the operation stability of the centrifugal extraction machine, thereby increasing the service life of the equipment, thereby prolonging the continuous working time of the system and stabilizing the cascade centrifugal extraction process. In addition, the magnetic levitation bearing can be adjusted online after assembly, which reduces the difficulty of maintenance; the shaft seal is canceled, which saves limited equipment space, reduces the length of the shaft system, and avoids cost waste; as the pressure boundary of the extraction system, the shell can effectively Limit extraction agent liquid or steam erosion drive mechanism, easy to achieve high pressure, high temperature extraction.

Description of drawings

Fig. 1 is the structural representation of the centrifugal extractor of embodiment one of the present invention;

Fig. 2 is the structural representation of the centrifugal extractor of embodiment two of the present invention;

Fig. 3 is the schematic structural view of the centrifugal extractor of the third embodiment of the present invention;

Fig. 4 is a schematic structural view of a centrifugal extractor according to Embodiment 4 of the present invention;

Fig. 5 is a structural schematic diagram of the first radial magnetic suspension bearing of the centrifugal extractor of the present invention;

Fig. 6 is a structural schematic diagram of the second radial magnetic suspension bearing of the centrifugal extractor of the present invention;

Fig. 7 is a structural schematic diagram of the axial magnetic suspension bearing of the centrifugal extractor of the present invention.

Explanation of reference signs

Motor 1, motor base 11, motor rotor 12, motor stator 13;

Magnetic coupling 2, outer magnet 21, shielding cover 22, inner magnet 23;

Upper shell 3, first sealing ring 31, second sealing ring 32, cover plate 33;

The first radial magnetic suspension bearing 4, the first stator 41, the first rotor 42, and the first radial position sensor 43;

The second radial magnetic suspension bearing 5, the second stator 51, the second rotor 52, and the second radial position sensor 53;

Axial magnetic suspension bearing 6, a third stator 61, a force receiving part 62, and an axial position sensor 63;

Shell 7, heavy phase collection chamber 71, heavy phase outlet 72, heavy phase weir 73, light phase collection chamber 74, light phase outlet 75, light phase weir 76;

Drum 8, first feed port 81, feed channel 82, second feed port 83;

Centrifugal shaft 9, stirring part 91, guide blade 92.

Detailed ways

The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

Embodiment one

As shown in Figure 1 is the first embodiment of the centrifugal extractor of the present invention. The centrifugal extractor includes a housing 7, a drum 8 and a centrifugal shaft 9, the housing 7 is arranged outside the drum 8, the centrifugal shaft 9 is fixedly connected with the drum 8, and the centrifugal extractor also includes: a magnetic suspension bearing for generating 9 and the radial and axial magnetic forces of the rotating drum 8 to limit the displacement of the centrifugal shaft 9 and the rotating drum 8; the magnetic suspension bearing includes a first radial magnetic suspension bearing 4, and the first radial magnetic suspension bearing 4 is arranged above the casing 7 And it is located at the top of the centrifugal shaft 9, and is used to limit the radial displacement of the top of the centrifugal shaft 9; as shown in Figure 5, the first radial magnetic suspension bearing 4 includes a first stator 41 and a first rotor 42, and the first rotor 42 is arranged on On the centrifugal shaft 9, the first stator 41 is arranged on the outer peripheral side of the first rotor 42; the magnetic suspension bearing also includes a second radial magnetic suspension bearing 5, and the second radial magnetic suspension bearing 5 is arranged at the lower end of the casing 7 and is located in the drum 8 The lower part is used to limit the radial displacement of the drum 8; as shown in Figure 6, the second radial magnetic suspension bearing 5 includes a second stator 51 and a second rotor 52, and the second rotor 52 is arranged on the outer peripheral side of the lower part of the drum 8 , the second stator 51 is arranged on the outer peripheral side of the second rotor 52; the centrifugal extractor also includes a motor 1, and the motor 1 is arranged outside the casing 7 for driving the centrifugal shaft 9 to rotate. The centrifugal extractor adopts the above-mentioned structure, which isolates the internal and external atmosphere of the centrifugal extractor, avoids the leakage of the extracted raw materials, limits the displacement of the centrifugal shaft 9 and the drum 8 through the magnetic suspension bearing, and does not produce contact between the bearing and the shaft, without friction, and significantly improves the bearing life. At the same time, the continuous working time of the centrifugal extractor is extended, and the magnetic suspension bearing is set on the drum 8 to limit its radial displacement, which can improve the bearing capacity of the drum 8, increase the stability and load, and reduce the overall load of the extractor. volume.

The motor 1 includes a motor stator 13 and a motor rotor 12 , the motor rotor 12 is arranged on the centrifugal shaft 9 , and the motor stator 13 is arranged on the outer peripheral side of the motor rotor 12 . By controlling the electromagnetic force generated by electrification between the motor stator 13 and the motor rotor 12 to drive the centrifugal shaft 9 to rotate, the friction force during operation is greatly reduced, and the sealing performance of the device is improved at the same time.

In other embodiments, depending on the corrosiveness of the solution, a shielding sleeve can also be provided between the motor stator 13 and the motor rotor 12; a cooling channel can also be provided near the motor stator 13 for cooling the motor 1 and the magnetic suspension bearing.

As shown in Figure 7, the magnetic suspension bearing also includes an axial magnetic suspension bearing 6, the axial magnetic suspension bearing 6 is arranged between the first radial magnetic suspension bearing 4 and the shell 7, the axial magnetic suspension bearing 6 includes a third stator 61; the centrifugal shaft 9 There is a force receiving part 62 on it, and the third stator 61 is arranged on both sides of the force receiving part 62 to limit the axial displacement of the centrifugal shaft 9; the axial magnetic suspension bearing 6 is an electromagnetic suspension bearing. There is a magnetic force between the third stator 61 and the force-receiving part 62, so that the centrifugal shaft 9 is suspended in the axial direction, and the friction force during operation is greatly reduced.

In other embodiments, the axial magnetic suspension bearing 6 can also be other types of magnetic suspension bearings; without affecting the normal operation of the centrifugal extractor, the axial magnetic suspension bearing 6 can also be arranged above the first radial magnetic suspension bearing 4 or other locations.

The centrifugal extractor also includes an upper shell 3 , and the first radial magnetic suspension bearing 4 and the axial magnetic suspension bearing 6 are located in the upper shell 3 . The upper shell 3 surrounds the first radial magnetic suspension bearing 4 and the axial magnetic suspension bearing 6, so that they operate in a closed environment and avoid contamination.

A first seal ring 31 is provided between the upper shell 3 and the outer shell 7 , and the centrifugal shaft 9 passes through the first seal ring 31 . The first sealing ring 31 isolates the shell 7 and the upper shell 3 and seals the inner chamber to avoid leakage of the raw material to be extracted.

A cover plate 33 is provided on the upper part of the upper case 3 , and a second sealing ring 32 is provided between the upper case 3 and the cover plate 33 . The second sealing ring 32 seals the upper shell 3 to avoid leakage of the raw material to be extracted.

The centrifugal extractor also includes an axial position sensor 63, which is arranged on the outer peripheral side of the axial magnetic suspension bearing 6, and the axial position sensor 63 is used to monitor the axial displacement of the centrifugal shaft 9, so as to facilitate timely adjustment of the axial magnetic suspension bearing 6. Avoid increased friction.

The centrifugal extractor also includes a first radial position sensor 43, the first radial position sensor 43 is arranged on the top of the first radial magnetic suspension bearing 4, and is used to monitor the radial displacement of the upper part of the centrifugal shaft 9, so as to adjust the first radial position in time. To the magnetic suspension bearing 4, avoid friction increase.

The centrifugal extractor also includes a second radial position sensor 53, the second radial position sensor 53 is arranged above the second radial magnetic suspension bearing 5, and is used to monitor the radial displacement of the lower part of the centrifugal shaft 9, so as to adjust the second radial position in time. To the magnetic suspension bearing 5, avoid friction increase.

In other embodiments, the positions of the axial position sensor 63 , the first radial position sensor 43 and the second radial position sensor 53 can be adjusted without affecting the normal operation of the centrifugal extractor.

The bottom of the drum 8 is provided with a first feed port 81 and a feed channel 82, the centrifugal shaft 9 passes through the first feed port 81, and the centrifugal shaft 9 is provided with a stirring part 91 below the first feed port 81, The stirring part 91 is paddle-shaped. The agitating part 91 fully agitates the liquid entering the first feeding port 81, thereby facilitating subsequent processing.

In other embodiments, the stirring portion 91 may also be cylindrical, turbine-shaped or other shapes.

The upper part of the shell 7 is provided with a heavy phase collection chamber 71, a heavy phase outlet 72 and a heavy phase weir 73; the lower part of the heavy phase outlet 72 is provided with a light phase collection chamber 74, and the light phase collection chamber 74 is provided with a light phase outlet 75; A light phase weir 76 is provided on the upper part of the light phase collection chamber 74 . The heavy phase collection chamber 71, the heavy phase outlet 72 and the heavy phase weir 73 cooperate to collect and export the heavy phase separated in the drum 8, and the light phase weir 76 separates the light phase from the liquid in the drum 8, and the light phase is separated from the liquid in the drum 8. The phase collection chamber 74 collects and flows out through the light phase outlet 75, and each component in the feed liquid flows out from different outlets respectively, thereby facilitating collection and utilization.

The present invention also provides a centrifugal extraction system, which includes multiple centrifugal extractors as described above, and the multiple centrifugal extractors work in parallel. When some centrifugal extraction machines in the centrifugal extraction system fail, they can be quickly switched to other equipment to continue working without suspending the operation of the entire centrifugal extraction system for maintenance, thereby greatly improving the reliability and work efficiency of the centrifugal extraction system.

In other embodiments, some centrifugal extractors may also work in series.

Embodiment two

As shown in Figure 2 is the second embodiment of the centrifugal extractor of the present invention. Most of the structure of this embodiment is the same as that of Embodiment 1, the difference is that the bottom of the rotating drum 8 is not provided with a feeding channel 82 and a stirring part 91, and at the same time, the bottom of the rotating drum 8 is provided with a first feeding port 81 and two sides are provided The second feed port 83 is defined by the rotating drum 8 and the shell 7 to form a feed channel 82 connecting the first feed port 81 and the second feed port 83, and the shell 7 is provided with a feed port below the first feed port 81. guide vanes 92 .

In this embodiment, the feeding channel 82 and the stirring part 91 are not provided at the bottom of the drum 8 .

Correspondingly, the side of shell 7 is provided with second feeding port 83, and the bottom of rotary drum 8 is provided with first feeding port 81, and between first feeding port 81 and second feeding port 83 is provided with rotating drum 8 and The casing 7 defines a feeding channel 82 , and the casing 7 is provided with guide vanes 92 below the first feeding opening 81 . When the feed liquid flows in the feed channel 82, it is fully stirred and guided into the drum 8, which is convenient for subsequent treatment.

Embodiment three

As shown in Fig. 3 is the third embodiment of the centrifugal extractor of the present invention. Most of the structure of this embodiment is the same as that of Embodiment 1, except that the cover plate 33 is not provided, and the motor 1 is not arranged on the outer peripheral side of the centrifugal shaft 9 in the upper shell 3, but is arranged on the motor seat above the upper shell 11, a magnetic coupling 2 is provided between the motor 1 and the upper shell 3.

In this embodiment, the centrifugal extractor is not provided with a cover plate 33, and the motor 1 is arranged on the outside of the casing 7 to drive the rotation of the centrifugal shaft 9; the magnetic coupling 2 includes an outer magnet 21 and an inner magnet 23, and the inner magnet 23 is fixed On the centrifugal shaft 9 , the outer magnet 21 is arranged on the outer peripheral side of the inner magnet 23 and electrically connected with the motor 1 , and the magnetic coupling 2 is used to transmit torque to the centrifugal shaft 9 to drive the centrifugal shaft 9 to rotate. The motor 1 is not in direct contact with the centrifugal shaft 9 and the drum 8, and the torque is transmitted through the magnetic coupling 2 to drive the centrifugal shaft 9 to rotate, thereby eliminating the sealing device of the motor 1 and expanding the selection range of the motor 1.

The inner magnet 23 is arranged axially on the outer surface of the centrifugal shaft 9 . The inner magnet 23 has a larger area, which is convenient for the smooth transmission of torque.

The magnetic coupling 2 also includes a shield 22 disposed between the outer magnet 21 and the inner magnet 23 . The shielding cover 22 separates the outer magnet 21 and the inner magnet 23 to avoid leakage of the raw material to be extracted and improve the sealing performance of the equipment.

The centrifugal extractor also includes an upper shell 3, the motor 1 is arranged above the magnetic coupling 2, the motor 1 is arranged on the motor seat 11, the magnetic coupling 2 is arranged in the motor seat 11 above the upper shell 3, and the magnetic coupling A second sealing ring 32 is provided between 2 and the upper shell 3, and the magnetic coupling 2 and the upper shell 3 are fixedly connected by a flange. The second sealing ring 32 isolates the magnetic coupling 2 and the upper shell 3 and seals the inner chamber to avoid leakage of the raw material to be extracted.

Embodiment four

As shown in Figure 4, it is the fourth embodiment of the centrifugal extractor of the present invention. Most of the structure of this embodiment is the same as that of the third embodiment, the difference is that the bottom of the rotating drum 8 is not provided with a feeding channel 82 and a stirring part 91, and at the same time, a first feeding port 81 is provided at the bottom of the rotating drum 8, and two sides are provided with The second feed port 83 is defined by the rotating drum 8 and the shell 7 to form a feed channel 82 connecting the first feed port 81 and the second feed port 83, and the shell 7 is provided with a feed port below the first feed port 81. guide vanes 92 .

In this embodiment, the feeding channel 82 and the stirring part 91 are not provided at the bottom of the drum 8 .

Correspondingly, the side of shell 7 is provided with second feeding port 83, and the bottom of rotary drum 8 is provided with first feeding port 81, and between first feeding port 81 and second feeding port 83 is provided with rotating drum 8 and The casing 7 defines a feeding channel 82 , and the casing 7 is provided with guide vanes 92 below the first feeding opening 81 . When the feed liquid flows in the feed channel 82, it is fully stirred and guided into the drum 8, which is convenient for subsequent treatment.

In the specific implementation process, various implementation modes of the present invention can also be combined in order to obtain better technical effects.

Although the specific implementation of the present invention has been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (17)

1. The utility model provides a centrifugal extraction machine, includes shell, rotary drum and centrifugal shaft, the shell sets up outside the rotary drum, centrifugal shaft with rotary drum fixed connection, its characterized in that, centrifugal extraction machine still includes:

a magnetic suspension bearing for generating magnetic forces in radial and axial directions of the centrifugal shaft and the drum to restrict displacement of the centrifugal shaft and the drum;

the magnetic suspension bearing comprises a first radial magnetic suspension bearing which is arranged above the shell and positioned at the upper part of the centrifugal shaft and used for limiting the radial displacement of the upper part of the centrifugal shaft; the first radial magnetic suspension bearing comprises a first stator and a first rotor, the first rotor is arranged on the centrifugal shaft, and the first stator is arranged on the outer periphery side of the first rotor;

the magnetic suspension bearing further comprises a second radial magnetic suspension bearing, wherein the second radial magnetic suspension bearing is arranged at the lower end of the shell and positioned at the lower part of the rotary drum and is used for limiting radial displacement of the rotary drum; the second radial magnetic suspension bearing comprises a second stator and a second rotor, the second rotor is arranged on the outer peripheral side of the lower part of the rotary drum, and the second stator is arranged on the outer peripheral side of the second rotor;

and the motor is arranged outside the shell and used for driving the centrifugal shaft to rotate.

2. The centrifugal extractor of claim 1 wherein the motor includes a motor stator and a motor rotor, the motor rotor being disposed on the centrifugal shaft, the motor stator being disposed on an outer peripheral side of the motor rotor.

3. The centrifugal extractor according to claim 1, further comprising a magnetic coupling including an outer magnet fixed to the centrifugal shaft and an inner magnet provided on an outer peripheral side of the inner magnet and electrically connected to the motor, the magnetic coupling being for transmitting torque to the centrifugal shaft to drive the centrifugal shaft to rotate.

4. A centrifugal extractor according to claim 3, wherein said inner magnet is axially disposed on the outer surface of said eccentric shaft.

5. The centrifugal extractor of claim 3 wherein the magnetic coupling further comprises a shield disposed between the outer magnet and the inner magnet.

6. The centrifugal extractor of claim 1 wherein the magnetic bearings further comprise axial magnetic bearings disposed between the first radial magnetic bearings and the housing, the axial magnetic bearings comprising a third stator;

the centrifugal shaft is provided with a stress part, and the third stators are arranged on two sides of the stress part and used for limiting the axial displacement of the centrifugal shaft.

7. The centrifugal extractor of claim 6 further comprising an upper housing, said first radial magnetic bearing and said axial magnetic bearing being located within said upper housing.

8. The centrifugal extractor of claim 7 wherein a first seal is provided between said upper housing and said outer housing, said centrifugal shaft extending through said first seal.

9. The centrifugal extractor of claim 7 wherein a cover plate is provided on the upper portion of the upper housing, and a second seal ring is provided between the upper housing and the cover plate.

10. A centrifugal extractor according to claim 3, further comprising an upper casing, said motor being arranged above said magnetic coupling, said motor being arranged on a motor mount, said magnetic coupling being arranged in said motor mount above said upper casing, a second sealing ring being arranged between said magnetic coupling and said upper casing.

11. The centrifugal extractor of claim 6 further comprising an axial position sensor provided on the outer peripheral side of the axial magnetic bearing, the axial position sensor being configured to monitor the axial displacement of the centrifugal shaft.

12. The centrifugal extractor of claim 1 further comprising a first radial position sensor disposed above the first radial magnetic bearing for monitoring radial displacement of the upper portion of the centrifugal shaft.

13. The centrifugal extractor of claim 1 further comprising a second radial position sensor disposed above the second radial magnetic bearing for monitoring radial displacement of the lower portion of the bowl.

14. The centrifugal extractor according to claim 1, wherein the bottom of the drum is provided with a first feed opening and a feed channel, the centrifugal shaft passes through the feed opening, and a stirring portion is provided on the centrifugal shaft below the feed opening.

15. The centrifugal extractor according to claim 1, wherein the bottom of the drum is provided with a first feed inlet, the side of the housing is provided with a second feed inlet, a feed channel is defined between the first feed inlet and the second feed inlet by the drum and the housing, and a guide vane is provided on the housing below the first feed inlet.

16. The centrifugal extractor according to claim 1, wherein the upper portion in the housing is provided with a heavy phase collection chamber, a heavy phase outlet and a heavy phase weir; the lower part of the heavy phase outlet is provided with a light phase collecting chamber, and the light phase collecting chamber is provided with a light phase outlet; the upper part of the light phase collecting chamber is provided with a light phase weir.

17. A centrifugal extraction system comprising a plurality of centrifugal extractors according to any one of claims 1-16, a plurality of said centrifugal extractors being connected in series and/or in parallel.