A centrifugal extractor and a centrifugal extraction system

Abstract

The utility model relates to the field of solvent extraction, in particular to a centrifugal extractor and centrifugal extraction system. The utility model is used to solve the problem that the existing centrifugal extractor runs under special environment, the heat generated around the sealing element cannot be discharged in time, and the service life of the centrifugal extractor is affected. The centrifugal extractor comprises a sealing shell and a main shaft, a drum is connected to the main shaft in the sealing shell, a bearing seat is installed on the upper part of the sealing shell, a bearing is installed in the bearing seat, an annular liquid flow chamber for the flow of cooling liquid is arranged on the bearing seat, the liquid flow chamber covers at least the position of the bearing in the axial direction to dissipate heat for the bearing, and a liquid inlet for inputting the cooling liquid into the liquid flow chamber and a liquid outlet for outputting from the liquid flow chamber are further arranged on the bearing seat.

Description

Technical Field

[0001] This utility model relates to the field of solvent extraction, specifically to a centrifugal extractor and a centrifugal extraction system. Background Technology

[0002] Centrifugal extractors are highly efficient liquid-liquid extraction devices. Currently, centrifugal extractors have been successfully applied in fields such as petrochemicals, materials preparation, biochemicals, pharmaceutical engineering, wastewater treatment, hydrometallurgy, and nuclear chemistry.

[0003] Chinese invention patent application CN104587704A discloses an annular gap centrifugal extractor with a vertical mixing baffle. This centrifugal extractor includes a high-speed motor and a vertically arranged main shaft driven by the high-speed motor. It also includes a sealed housing, with the main shaft extending into the sealed housing. A rotating drum fixedly connected to the main shaft is disposed within the sealed housing. A bearing seat is mounted on the upper part of the sealed housing, and a bearing that rotatably supports the main shaft is installed within the bearing seat. A seal is also provided between the bearing seat and the main shaft. The main shaft and bearing, as power transmission components of the centrifugal extractor, generate a large amount of heat during operation, which can lead to overheating of components such as the seals and deterioration of the lubricating grease, affecting the service life of the centrifugal extractor. Utility Model Content

[0004] The purpose of this invention is to provide a centrifugal extractor to solve the problem that the heat generated by the bearings of existing centrifugal extractors cannot be dissipated in time during operation, thus affecting the service life of the centrifugal extractor; the purpose of this invention is also to provide a centrifugal extraction system to solve the problem that the heat generated by the bearings of existing centrifugal extractors cannot be dissipated in time during operation, thus affecting the service life of the centrifugal extractor.

[0005] To solve the above-mentioned technical problems, the centrifugal extractor of this utility model includes a sealed housing and a main shaft extending into the sealed housing. A rotating drum is fixedly connected to the main shaft inside the sealed housing. A bearing seat is installed on the upper part of the sealed housing. A bearing that rotatably supports the main shaft is installed in the bearing seat. An annular liquid flow chamber for supplying coolant is provided on the bearing seat. The liquid flow chamber covers at least the position of the bearing in the axial direction to dissipate heat from the bearing. The bearing seat is also provided with an inlet for the coolant to enter the liquid flow chamber and an outlet for the coolant to exit from the liquid flow chamber.

[0006] Furthermore, the bearing housing includes an inner housing and an outer housing sealed outside the inner housing. An annular cavity is formed between the inner housing and the outer housing, which constitutes the liquid flow chamber. The liquid inlet and liquid outlet are provided on the outer housing.

[0007] Furthermore, there are two or more bearings and two or more liquid flow chambers, and each liquid flow chamber corresponds to the bearing position in the axial direction to dissipate heat from the corresponding bearing.

[0008] Furthermore, there are two or more bearings, with the same liquid flow chamber covering each bearing axially.

[0009] Furthermore, the inlet is located at the bottom of the liquid flow chamber, and the outlet is located at the top of the liquid flow chamber.

[0010] Furthermore, partition plates are arranged circumferentially along the liquid flow chamber. The height of the partition plates is less than the height of the liquid flow chamber. The partition plates include an upper partition plate extending downward from the top wall of the liquid flow chamber and a lower partition plate extending upward from the bottom wall of the liquid flow chamber. The upper and lower partition plates are arranged alternately in the liquid flow chamber, thereby forming an S-shaped flow channel that guides the flow of coolant in the liquid flow chamber.

[0011] Furthermore, a spiral baffle is provided in the liquid flow chamber to form a spiral flow channel that guides the flow of coolant within the liquid flow chamber.

[0012] Furthermore, the inner seat is provided with a fixing member for the axial stop bearing. The fixing member is a heat-conducting fixing member, and the fixing member is in heat-conducting contact with the sealing member used to achieve the seal between the spindle and the bearing seat, as well as the inner seat.

[0013] Furthermore, the bearing housing includes an upper bearing mounting cylinder section for mounting the bearing and an extension cylinder section at the lower part of the bearing mounting cylinder section. The extension cylinder section, the main shaft, the sealing housing, and the sealing element for achieving a seal between the main shaft and the bearing housing together form a gas-carrying positive pressure chamber. The extension cylinder section is provided with an inlet and an outlet that communicate with the gas-carrying positive pressure chamber, so that as the gas enters the gas-carrying positive pressure chamber through the inlet and exits through the outlet, it carries the volatile gas that leaks from the sealing housing into the chamber.

[0014] This invention proposes an improved technical solution to address the aforementioned technical problems. The core concept of this invention is: an annular liquid flow chamber for supplying coolant is provided on the bearing housing. This liquid flow chamber axially covers at least the area where the bearing is located to dissipate heat from the bearing. The bearing housing also has an inlet for coolant to enter the liquid flow chamber and an outlet for coolant to exit from the liquid flow chamber. After the coolant fills the liquid flow chamber, it dissipates heat from the bearing, promptly removing heat from the bearing and preventing bearing failure and grease deterioration due to excessive bearing temperature, thus improving the service life of the centrifugal extractor.

[0015] Another aspect of this utility model provides a centrifugal extraction system, which includes a group of centrifugal extractors. Each centrifugal extractor includes a sealed housing and a main shaft extending into the sealed housing. A rotating drum is fixedly connected to the main shaft inside the sealed housing. A bearing seat is installed on the upper part of the sealed housing, and a bearing for rotatably supporting the main shaft is installed inside the bearing seat. The bearing seat is provided with an annular liquid flow chamber for supplying coolant. The liquid flow chamber covers at least the bearing location in the axial direction to dissipate heat from the bearing. The bearing seat is also provided with an inlet for coolant to enter the liquid flow chamber and an outlet for coolant to exit from the liquid flow chamber. The inlet and outlet of the centrifugal extractor are respectively connected to an inlet pipe and an outlet pipe. The inlet and outlet pipes of each centrifugal extractor are connected in parallel; or the inlet and outlet pipes of each centrifugal extractor are connected in series.

[0016] Furthermore, the bearing housing includes an inner housing and an outer housing sealed outside the inner housing. An annular cavity is formed between the inner housing and the outer housing, which constitutes the liquid flow chamber. The liquid inlet and liquid outlet are provided on the outer housing.

[0017] Furthermore, there are two or more bearings and two or more liquid flow chambers, and each liquid flow chamber corresponds to the bearing position in the axial direction to dissipate heat from the corresponding bearing.

[0018] Furthermore, there are two or more bearings, with the same liquid flow chamber covering each bearing axially.

[0019] Furthermore, the inlet is located at the bottom of the liquid flow chamber, and the outlet is located at the top of the liquid flow chamber.

[0020] Furthermore, partition plates are arranged circumferentially along the liquid flow chamber. The height of the partition plates is less than the height of the liquid flow chamber. The partition plates include an upper partition plate extending downward from the top wall of the liquid flow chamber and a lower partition plate extending upward from the bottom wall of the liquid flow chamber. The upper and lower partition plates are arranged alternately in the liquid flow chamber, thereby forming an S-shaped flow channel that guides the flow of coolant in the liquid flow chamber.

[0021] Furthermore, a spiral baffle is provided in the liquid flow chamber to form a spiral flow channel that guides the flow of coolant within the liquid flow chamber.

[0022] Furthermore, the inner seat is provided with a fixing member for the axial stop bearing. The fixing member is a heat-conducting fixing member, and the fixing member is in heat-conducting contact with the sealing member used to achieve the seal between the spindle and the bearing seat, as well as the inner seat.

[0023] Furthermore, the bearing housing includes an upper bearing mounting cylinder section for mounting the bearing and an extension cylinder section at the lower part of the bearing mounting cylinder section. The extension cylinder section, the main shaft, the sealing housing, and the sealing element for achieving a seal between the main shaft and the bearing housing together form a gas-carrying positive pressure chamber. The extension cylinder section is provided with an inlet and an outlet that communicate with the gas-carrying positive pressure chamber, so that as the gas enters the gas-carrying positive pressure chamber through the inlet and exits through the outlet, it carries the volatile gas that leaks from the sealing housing into the chamber.

[0024] This invention proposes an improved technical solution to address the aforementioned technical problems. The core concept of this invention is: an annular liquid flow chamber for supplying coolant is provided on the bearing housing. This liquid flow chamber axially covers at least the area where the bearing is located to dissipate heat from the bearing. The bearing housing also has an inlet for coolant to enter the liquid flow chamber and an outlet for coolant to exit from the liquid flow chamber. After the coolant fills the liquid flow chamber, it dissipates heat from the bearing, promptly removing heat from the bearing and preventing bearing failure due to excessive temperature and grease deterioration, thereby improving the service life of the centrifugal extractor. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the structure of the bearing seat installed on the upper part of the sealed housing in one embodiment of the centrifugal extractor of this utility model; Figure 2 This is a schematic diagram showing the structure of the bearing seat installed on the upper part of the sealed housing in Embodiment 2 of the present invention; Figure 3 for Figure 2 A cross-sectional view of the AA plane; Figure 4 for Figure 2 A schematic diagram of the arrangement of partition plates inside the liquid flow chamber; Figure 5 This is a schematic diagram of the first embodiment of a centrifugal extraction system according to the present invention; Figure 6 This is a schematic diagram of a second embodiment of a centrifugal extraction system according to the present invention; Figure 7 A schematic diagram of a gas-carrying positive pressure chamber set on the bearing module of a centrifugal extractor.

[0026] In the diagram: 1. Main shaft; 2. Inner seat; 21. Annular groove; 22. Air inlet; 23. Air outlet; 3. Outer shell; 4. Liquid inlet; 5. Liquid outlet; 6. Bearing; 7. Sealing shell; 8. Fixing component; 9. Sealing component; 10. Upper partition plate; 11. Lower partition plate; 12. Liquid inlet pipe; 13. Liquid outlet pipe; 789. Gas-carrying positive pressure chamber. Detailed Implementation

[0027] This utility model proposes an improved technical solution to address the above-mentioned technical problems. The core concept of this utility model is: to provide an annular liquid flow chamber for supplying coolant on the bearing housing, the liquid flow chamber covering at least the bearing location in the axial direction to dissipate heat from the bearing, and the bearing housing is also provided with an inlet for coolant to enter the liquid flow chamber and an outlet for coolant to exit from the liquid flow chamber.

[0028] Based on the above concept, such as Figure 1 , Figure 2 As shown, a centrifugal extractor of this invention includes a drive motor and a vertically arranged main shaft 1 connected to the drive motor for transmission. It also includes a sealed housing 7, with the main shaft 1 extending into the sealed housing 7. A rotating drum fixedly connected to the main shaft 1 is disposed within the sealed housing 7. A bearing seat is mounted on the upper part of the sealed housing 7, and a bearing 6, which rotatably supports the main shaft 1, is installed within the bearing seat. The bearing seat has an annular liquid flow chamber for supplying coolant. The liquid flow chamber covers at least the location of the bearing 6 in the axial direction to dissipate heat from the bearing 6. The bearing seat also has an inlet 4 for coolant to enter the liquid flow chamber and an outlet 5 for coolant to exit from the liquid flow chamber. In use, coolant can be filled into the liquid flow chamber. Because the liquid flow chamber covers the location of the bearing 6 in the axial direction, the coolant flow can dissipate heat from the bearing 6, preventing bearing 6 failure and grease deterioration due to excessive temperature, thus improving the service life of the centrifugal extractor.

[0029] like Figure 1 , Figure 2 As shown, the bearing housing includes an inner housing 2 and an outer housing 3 sealed around the inner housing 2. An annular groove 21 is provided on the outer circumferential surface of the inner housing 2. The annular cavity formed by the annular groove 21 of the inner housing 2 and the outer housing 3 constitutes the liquid flow chamber. An inlet 4 and an outlet 5 are provided on the outer housing 3. The annular groove structure is simple and easy to manufacture. Of course, in other embodiments, the annular groove can be provided on the outer housing, and the annular cavity formed by the annular groove of the outer housing and the inner housing constitutes the liquid flow chamber; or both the inner housing and the outer housing have annular grooves, and the annular space formed by the annular grooves on both the inner housing and the outer housing constitutes the liquid flow chamber. The inner housing 2 and the outer housing 3 can be integrally cast or welded together, as long as they can form a liquid flow chamber for coolant flow.

[0030] The number and position of bearings 6 can be configured according to the axial length of the bearing housing (specifically, the bearing mounting sleeve section of the bearing housing described below). For example, two, three, four, or more bearings can be installed. This solution does not limit the number and position of bearings. When two bearings are installed, they can be positioned at opposite ends of the bearing housing. The same annular groove 21 covers each bearing 6 axially. Figure 2 As shown, there are two bearings 6, one upper and one lower, and only one annular groove 21 covering both bearings 6 axially. Thus, multiple bearings 6 can be cooled simultaneously using a single liquid flow chamber. The liquid inlet 4 on the outer casing 3 is located at the bottom of the liquid flow chamber, and the liquid outlet 5 is located at the top. When coolant is added, it forces air out of the liquid flow chamber, ensuring the entire chamber is filled and guaranteeing reliable cooling of the bearings 6.

[0031] The liquid flow chamber is provided with flow channels to guide the flow of coolant. For example... Figure 3 , Figure 4 As shown, partition plates are arranged circumferentially around the liquid flow chamber. The height of the partition plates is less than the height of the liquid flow chamber. The partition plates include an upper partition plate 10 extending downward from the top wall of the liquid flow chamber and a lower partition plate 11 extending upward from the bottom wall of the liquid flow chamber. The flow channel is an S-shaped flow channel formed by the alternating arrangement of the upper partition plate 10 and the lower partition plate 11 within the liquid flow chamber. In this way, the coolant flows in an S-shape within the liquid flow chamber, which on the one hand increases the flow path of the coolant, and on the other hand ensures that the coolant flows evenly along the flow channel within the liquid flow chamber, thus ensuring the cooling effect. Moreover, in this case, the S-shaped flow channel allows both the inlet and outlet to be located at the top or bottom of the liquid flow chamber.

[0032] The bearing housing is provided with a fixing member 8 for axially stopping the bearing 6. The fixing member 8 is a heat-conducting fixing member. During operation, the bearing 6 can transfer its heat to the fixing member 8. The fixing member 8 is in direct contact with the inner housing 2 and can achieve heat transfer. After the coolant is filled into the liquid flow chamber, it can dissipate heat to both the fixing member 8 and the bearing 6 at the same time, thereby improving the heat dissipation efficiency of the bearing 6.

[0033] The fixing member 8 is in thermally conductive contact with the sealing member 9, which is used to seal the spindle 1 and the bearing housing, as well as the inner housing (i.e., after assembly, they have a contact portion that allows for heat transfer). Thus, the sealing member 9 can also transfer its own heat to the fixing member 8. After the coolant fills the liquid flow chamber, it dissipates heat from the fixing member 8, thereby dissipating heat from the sealing member 9, preventing overheating of the sealing member 9 and ensuring the reliability of the bearing housing seal. The fixing member 8 is annular and uses its ends to stop the bearing 6. The annular fixing member 8 has an inwardly extending annular inner edge on its radially inner side. The sealing member 9 is installed on the side of the annular inner edge of the fixing member 8 away from the bearing 6. This prevents localized overheating of the sealing member 9 and the bearing 6, and transfers heat to the bearing housing through direct contact with the fixing member 8, ensuring heat dissipation for all three components: the sealing member 9, the fixing member 8, and the bearing 6.

[0034] In some special scenarios, flammable, explosive, volatile, corrosive, or toxic volatile gases may exist inside the sealed housing 7 of the centrifugal extractor. In such cases, it is necessary to prevent the gases inside the sealed housing 7 from evaporating into the outside air. In this embodiment, the bearing housing includes an upper bearing mounting section for mounting the bearing 6 and an extension section below the bearing mounting section. The extension section of the bearing housing, the main shaft 1, the sealed housing 7, and the sealing element 9 for achieving a seal between the main shaft 1 and the bearing housing together form a gas-carrying positive pressure chamber 789. Figure 7 As shown, the extended cylindrical section is provided with an air inlet 22 and an air outlet 23 that are connected to the gas-carrying positive pressure chamber 789.

[0035] Specifically, during the operation of the centrifugal extraction device, the gas pressure inside the positive pressure chamber can be slightly higher than that inside the sealed housing 7 by controlling the inlet and outlet volumes of the gas-carrying positive pressure chamber. This ensures a good rotational seal between the main shaft 1 and the top cover of the sealed housing 7, thus guaranteeing a proper seal. However, under certain conditions, volatile gases inside the sealed housing 7 may escape from between the main shaft 1 and the sealed housing 7 into the gas-carrying positive pressure chamber 789. Once inside the gas-carrying positive pressure chamber 789, the volatile gases are quickly carried away by the airflow. The combination of the positive pressure chamber 789, the inlet 22, and the outlet 23 effectively treats and dilutes the volatile gases. It should be noted that the slight positive pressure inside the gas-carrying positive pressure chamber depends on the gas pressure inside the sealed housing. For centrifugal extraction, the higher the temperature inside the sealed housing and the greater the amount of gas that continuously evaporates and accumulates, the higher the gas pressure will continuously rise. The set value of the gas pressure inside the gas-carrying positive pressure chamber can be determined based on the allowable accumulation of volatile gases inside the sealed housing.

[0036] In this way, if any volatile gas leaks from the mating point between the main shaft and the sealing housing, it can be carried away by the airflow in the positive pressure chamber, preventing the volatile gas from escaping into the outside air and significantly improving the safety during use. Moreover, this centrifugal extraction device can not only operate at high temperatures, but also reduces the cost of manufacturing the centrifugal extraction device due to its reasonable shaft seal structure.

[0037] The air inlet 22 and air outlet 23 are connected to a gas flow pipeline. A gas treatment device can be connected in series on the gas flow pipeline. During use, the volatile gas in the bearing housing enters the gas treatment device through the air outlet 23 for purification. The purified gas is then reintroduced into the gas-carrying positive pressure chamber 789 through the air inlet 22. In this way, the volatile gas is prevented from escaping into the outside air through treatment, ensuring safety during use. Of course, an inert gas (inert gases as referred to in this article include traditionally considered helium, argon, etc., as well as nitrogen) can also be connected in series on the gas flow pipeline. The gas source device, after inert gas is filled into the gas-carrying positive pressure chamber 789, can isolate the flammable and explosive gases in the gas-carrying positive pressure chamber 789 from oxygen to prevent explosion, and can also dilute volatile gases to ensure safety during use. Of course, a refrigerant gas source device can also be connected in series on the gas flow pipeline. After the refrigerant gas is filled into the gas-carrying positive pressure chamber 789, it can cool the gas-carrying positive pressure chamber 789 to prevent explosion at high temperatures and ensure safety during use.

[0038] Figure 7 In the structure shown, the inner seat is a cylindrical structure with a stepped inner cavity that is smaller at the top and larger at the bottom. The smaller inner diameter section at the top forms the wall of the bearing mounting section, while the larger inner diameter section at the bottom forms the wall of the extension section. This allows the larger inner diameter section, along with the main shaft 1, the top cover of the sealing housing 7, and the seal 9 located at the lower fixing member, to form the gas-carrying positive pressure chamber 789. Compared to a bearing seat with a uniform axial inner diameter, this method increases the space of the gas-carrying positive pressure chamber 789 while maintaining a uniform axial length. This allows external gas to mix thoroughly with the volatile gases within the chamber and flow through it before being discharged through the outlet 5. Furthermore, without changing the space of the gas-carrying positive pressure chamber 789, the stepped inner cavity structure can reduce the height of the bearing seat.

[0039] Two bearings are installed in the bearing housing, arranged one above the other. The top bearing 6 is located near the top of the bearing housing, and a retainer 8 is installed on the top of the bearing housing to axially limit the bearing on the upper side. The retainer at the lower part of the bottom bearing 6 is installed at the step of the stepped cylindrical wall of the bearing housing. The bottom bearing 6 is located on the cylindrical wall of the smaller inner diameter section of the bearing housing, near the extended cylindrical section.

[0040] The fastener 8 has a stepped annular structure. The stepped annular surface of the upper fastener abuts against the upper end face of the bearing housing, and the lower end face of the fastener abuts against the upper end face of the bearing, thus limiting the bearing's position. The stepped annular surface of the lower fastener 8 abuts against the stepped annular surface of the inner wall of the bearing housing. After installation, the upper end of the fastener 8 abuts against the lower end face of the bearing 6 to limit the bearing 6's position. This type of fastener facilitates axial positioning with the bearing housing. The annular fastener 8 has an inwardly extending annular inner edge on its radially inner side, and the sealing ring 9 is installed on the side of the annular inner edge of the fastener 8 away from the bearing 6. This arrangement facilitates the disassembly and maintenance of the sealing ring.

[0041] Regarding the arrangement of the annular groove, this utility model also provides other embodiments. In another embodiment, such as... Figure 1 As shown, there can be multiple liquid flow chambers and corresponding inlets and outlets, arranged according to the position of each bearing. During operation, coolant is simultaneously filled into each liquid flow chamber, which can efficiently dissipate heat from each bearing.

[0042] Regarding the configuration of the flow channel, this utility model also provides other embodiments. In another embodiment, a spiral baffle is provided in the liquid flow chamber to form a spiral flow channel that guides the flow of coolant in the liquid flow chamber.

[0043] Regarding the location of the inlet and outlet, this utility model also provides other embodiments. In another embodiment, the inlet and outlet can both be located at the top of the liquid flow chamber. In this case, a flow channel to guide the flow of coolant needs to be provided in the liquid flow chamber to ensure the flow of coolant.

[0044] Regarding the fastener, this utility model also provides other embodiments. In another embodiment, the fastener may not have a heat conduction function, and the bearing relies solely on the coolant in the liquid flow chamber to dissipate heat.

[0045] Regarding the installation of the seal, this utility model also provides other embodiments. In another embodiment, the seal can also be installed between the bearing housing and the spindle, as long as the seal of the bearing is guaranteed.

[0046] Regarding the inner wall shape of the bearing housing, this utility model also provides other embodiments. In another embodiment, the inner wall of the bearing housing can also be cylindrical in shape. It is only necessary to ensure that the bearing housing has an extended cylindrical section at the lower part corresponding to the bottom bearing. The extended cylindrical section can form a gas-carrying positive pressure chamber together with the main shaft, the sealing housing and the seal.

[0047] Another aspect of this utility model provides a centrifugal extraction system, which includes a group of centrifugal extractors. Since the implementation of the centrifugal extractors is the same as that described above, it will not be repeated here. The inlet 4 and outlet 5 of the centrifugal extractors are respectively connected to an inlet pipe 12 and an outlet pipe 13, as shown below. Figure 5 As shown, the inlet pipe 12 and outlet pipe 13 of each centrifugal extractor are connected in parallel. In another embodiment, as... Figure 6 As shown, the inlet and outlet pipes of each centrifugal extractor can also be connected in series.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A centrifugal extractor, comprising a sealed housing and a main shaft extending into the sealed housing, wherein a rotating drum is fixedly connected to the main shaft within the sealed housing, a bearing housing is mounted on the upper part of the sealed housing, and a bearing for rotatably supporting the main shaft is installed within the bearing housing, characterized in that: The bearing housing is provided with an annular liquid flow chamber for supplying coolant. The liquid flow chamber covers at least the bearing location in the axial direction to dissipate heat from the bearing. The bearing housing is also provided with an inlet for coolant to enter the liquid flow chamber and an outlet for coolant to exit from the liquid flow chamber.

2. The centrifugal extractor according to claim 1, characterized in that: The bearing housing includes an inner housing and an outer housing that is sealed to the outer body of the inner housing. An annular cavity is formed between the inner housing and the outer housing, which constitutes the liquid flow chamber. The liquid inlet and liquid outlet are located on the outer housing.

3. The centrifugal extractor according to claim 1 or 2, characterized in that: There are two or more bearings and two or more liquid flow chambers, and each liquid flow chamber corresponds to the bearing position in the axial direction to dissipate heat from the corresponding bearing.

4. The centrifugal extractor according to claim 1 or 2, characterized in that: There are two or more bearings, and the same liquid flow chamber covers each bearing in the axial direction.

5. The centrifugal extractor according to claim 4, characterized in that: The inlet is located at the bottom of the liquid flow chamber, and the outlet is located at the top of the liquid flow chamber.

6. The centrifugal extractor according to claim 1 or 2, characterized in that: Dividers are arranged circumferentially along the liquid flow chamber. The height of the dividers is less than the height of the liquid flow chamber. The dividers include an upper divider extending downward from the top wall of the liquid flow chamber and a lower divider extending upward from the bottom wall of the liquid flow chamber. The upper and lower dividers are arranged alternately in the liquid flow chamber, thereby forming an S-shaped flow channel that guides the flow of coolant in the liquid flow chamber.

7. The centrifugal extractor according to claim 1 or 2, characterized in that: A spiral baffle is installed in the liquid flow chamber to form a spiral flow channel that guides the flow of coolant within the liquid flow chamber.

8. The centrifugal extractor according to claim 2, characterized in that: The inner seat is provided with a fixing member for axially stopping the bearing. The fixing member is a heat-conducting fixing member. The fixing member is in heat-conducting contact with the sealing member used to achieve the seal between the spindle and the bearing seat and the inner seat.

9. The centrifugal extractor according to claim 1 or 2, characterized in that: The bearing housing includes an upper bearing mounting section for mounting the bearing and an extension section at the lower part of the bearing mounting section. The extension section of the bearing housing, the main shaft, the sealing housing, and the sealing element for sealing between the main shaft and the bearing housing together form a gas-carrying positive pressure chamber. The extension section is provided with an inlet and an outlet that communicate with the gas-carrying positive pressure chamber, so that the gas carries the volatile gas that leaks from the sealing housing into the chamber as it enters the gas-carrying positive pressure chamber through the inlet and exits through the outlet.

10. A centrifugal extraction system, characterized in that: The invention includes a group of centrifugal extractors, wherein the centrifugal extractor is the centrifugal extractor according to any one of claims 1-9, and the inlet and outlet of the centrifugal extractor are respectively connected to an inlet pipe and an outlet pipe, and the inlet pipe and outlet pipe of each centrifugal extractor are connected in parallel; or the inlet pipe and outlet pipe of each centrifugal extractor are connected in series sequentially.

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