Single support structure centrifuge

Abstract

The present application relates to centrifugal extractor, especially to a single support structure centrifuge. The drum assembly structure of the centrifugal extractor comprises a shell, a drum, a drum shaft arranged at the shaft center of the drum, an upper bearing and a lower bearing arranged in the upper and lower direction corresponding to the top of the drum shaft, and a bearing seat arranged on the shell; the drum shaft is provided with a cavity, the bearing seat downwardly overhangs and enters the cavity; the bearing seat is cylindrical and has a through hole extending upward and downward, and a driving shaft is arranged in the through hole; the upper bearing and the lower bearing are arranged in the radial interval between the bearing seat and the driving shaft, and a fixed connection structure is arranged between the driving shaft and the drum shaft; or the upper bearing and the lower bearing are arranged in the radial interval between the bearing seat and the drum shaft, and a torque transmission structure is arranged between the driving shaft and the drum shaft; at least the lower bearing is below the top end surface of the drum. The present application can solve the problem of large axial space occupation of the existing centrifugal extractor.

Description

TECHNICAL FIELD

[0001] The present application relates to centrifugal extractors, in particular to a single support structure centrifugal machine. BACKGROUND

[0002] The current centrifugal extractors generally include a shell, a drum rotatably assembled in the shell, and a drum shaft arranged at the center of the drum, wherein the drum is rotatably assembled in the shell through the drum shaft. The rotatable assembly of the drum on the shell mainly has two forms, one is single support, i.e. only a bearing is arranged at the top end of the drum shaft, and the drum is hoisted on the shell through the drum bearing; the other is double support, i.e. an upper bearing is arranged at the top end of the drum shaft to form an upper support point, and a lower bearing is arranged at a position outside the drum to form a lower support point.

[0003] The drum shaft of a large-flow centrifugal extractor has a large load, and if a top single support point is used, the overhanging length of the drum shaft is too long, and it is difficult to ensure the running stability, so generally only an upper and lower double support structure can be used, for example, the liquid-liquid two-phase mixing-separation device disclosed in the Chinese Utility Model Patent with the publication number CN201899900U uses an upper bearing and a lower bearing structure, wherein the lower bearing is arranged on a bearing seat at the bottom of the shell. The upper and lower double support structure causes the lower bearing to be located at the bottom of the equipment and buried in the material, which requires a sealing structure to be arranged above the lower bearing. In order to meet the requirements of rotatable assembly and sealing effect, the sealing structure generally uses a mechanical seal. However, the arrangement of the mechanical seal complicates the structure of the bottom of the equipment, and the mechanical seal is a vulnerable part that needs to be replaced frequently, which requires the equipment to be shut down for a long time each time, greatly increasing the maintenance cost and reducing the production efficiency. Moreover, after the lower bearing structure is added to the lower end of the drum shaft, the lower bearing structure and the sealing structure occupy a certain axial space, resulting in a high height of the centrifugal extractor, which further causes transportation difficulties, especially for export models, which generally need to be transported by container. However, the height of some large-flow centrifugal extractors is often higher than the maximum height of the international standard container, which is 2698mm, causing internationalization difficulties.

[0004] In order to solve the problem of easy failure of mechanical seal, the upper suspension type structure is adopted in the centrifugal extractor drum disclosed in the Chinese utility model patent with the publication number CN206715372U, the upper bearing and the lower bearing are respectively fixed on the upper end and the lower end of the bearing seat on the top of the shell, the upper bearing and the lower bearing are pulled apart by a certain distance, two upper and lower interval arranged fulcrums are formed on the top end of the drum shaft (i.e. the driving long shaft in the centrifugal extractor drum disclosed in the above patent), the support point span is increased, the radial stress of the bearing is reduced, and the stability of the drum shaft and the drum during rotation is ensured. Although the upper suspension type structure can solve the problem of easy failure of mechanical seal at the bottom of the drum, the distance between the upper bearing and the lower bearing also directly increases the height of the centrifugal extractor, which will also cause the problem of difficult transportation. SUMMARY

[0005] The purpose of the present application is to provide a single support structure centrifuge to solve the problem of large axial space occupation of the existing centrifugal extractor.

[0006] The single support structure centrifuge of the present application adopts the following technical scheme:

[0007] A single support structure centrifuge, comprising a shell, a drum assembled in the shell, a drum shaft provided at the shaft center of the drum, a drum assembly structure further comprising an upper bearing and a lower bearing arranged in an upper and lower direction corresponding to the top of the drum shaft, a bearing seat provided on the shell for mounting the upper bearing and the lower bearing; a cavity is provided in the drum shaft, the top of the cavity has an opening located at the top end of the drum shaft, and the bearing seat downwardly overhangs and enters the cavity; the bearing seat is cylindrical and has a through hole extending upward and downward, and a driving shaft for connecting the drum driving device to drive the drum to rotate is arranged in the through hole;

[0008] The upper bearing and the lower bearing are arranged in the radial interval between the bearing seat and the driving shaft, and a fixed connection structure is arranged between the driving shaft and the drum shaft; or, the upper bearing and the lower bearing are arranged in the radial interval between the bearing seat and the drum shaft, and a torque transmission structure for driving the drum to rotate is arranged between the driving shaft and the drum shaft;

[0009] Among the upper bearing and the lower bearing, at least the lower bearing is below the top end face of the drum.

[0010] The beneficial effect of the above technical solution is that the cavity provided in the drum shaft provides a sinking space for the bearing seat, so that at least the lower bearing can be located below the top end surface of the drum, so that the bearing can utilize the axial space of the drum itself, reducing the overall axial space occupied by the centrifugal extractor; at the same time, on the one hand, the length of the drum cantilever is reduced, the vibration amplitude is reduced, and the stability of the drum is improved; on the other hand, under the same imbalance, the radial force exerted on the upper and lower bearings is significantly reduced, and the service life is improved; in addition, the bearing seat adopts a cylindrical structure, and the through hole thereon can be provided for the drive shaft to pass through, and then the driving force of the drum drive device is transmitted to the drum through the fixed connection structure / torque transmission structure between the drive shaft and the drum shaft, which can meet the driving requirements of the drum, and the fixed connection structure can also enable the weight of the drum to be transmitted to the bearing through the transmission path of the drum shaft, the fixed connection structure, and the drive shaft, thereby meeting the bearing's support requirements for the weight of the drum. Compared with the prior art of setting fulcrums between the shell and the top and bottom ends of the drum, or setting two fulcrums spaced apart from each other on the top of the drum shaft, the axial space occupied by the bearing can be saved, thereby solving the problem of large axial space occupation in the existing centrifugal extractor.

[0011] As a further limited technical solution: a shaft inner cavity sealing structure is provided between the drum shaft and the bearing seat, which is used to prevent the slurry in the drum installation cavity in the shell from entering the cavity in the drum shaft.

[0012] The beneficial effect of the technical solution further defined above is that the provision of a shaft inner cavity sealing structure can meet the protection requirements of the bearing after it sinks into the drum, preventing the bearing from being contaminated by the slurry and unable to work normally, shortening its service life, which is conducive to reducing the number of maintenance operations, and at the same time protecting the drum shaft to avoid corrosion from contact with the slurry.

[0013] As a further limited technical solution: the shaft inner cavity sealing structure includes a static sealing ring fixed on the outer peripheral surface of the bearing seat and a dynamic sealing ring fixed on the top of the drum, and a labyrinth sealing structure is formed between the static sealing ring and the dynamic sealing ring.

[0014] The beneficial effect of the technical solution further defined above is that the labyrinth seal structure is a non-contact seal, which can avoid wear and tear and has a long service life.

[0015] As a further limited technical solution: a bearing sealing structure is provided between the lower end portion of the bearing seat and the drive shaft, for isolating and protecting the upper bearing and the lower bearing arranged in the radial interval between the bearing seat and the drive shaft.

[0016] The beneficial effect of the technical solution further defined above is that the provision of the bearing sealing structure can further isolate the upper bearing and the lower bearing, thereby facilitating reliable and stable operation of the bearing.

[0017] As a further limited technical solution: the top of the bearing seat is provided with a bearing upper gland, and the bearing upper gland is provided with an air inlet and an air outlet to introduce gas into the bearing chamber formed by the bearing seat to form a positive pressure environment in the bearing chamber.

[0018] The beneficial effect of the above further limited technical solution is that the positive pressure environment formed by the gas can more effectively prevent the feed liquid and corrosive gas from entering the bearing chamber, improve the protection performance of the bearing chamber, and ensure the stability of the centrifugal extractor.

[0019] As a further limited technical solution: the bearing seat is provided with a cooling liquid flow channel, and the cooling liquid flow channel has a cooling liquid inlet and a cooling liquid outlet connected to a radiator through a cooling pipeline.

[0020] The beneficial effect of the above further limited technical solution is that it can improve the deterioration of the heat dissipation environment caused by the sinking of the bearing into the drum, and avoid excessive accumulation of heat generated during the rotation of the bearing to affect the service life of the bearing and the temperature of the feed liquid.

[0021] As a further limited technical solution: the bottom of the cavity is provided with a partition plate for separating the cavity from the lower space.

[0022] The beneficial effect of the above further limited technical solution is that the partition plate can prevent the feed liquid in the housing from entering the cavity from the bottom end of the drum shaft, further protecting the bearing, and forming a secondary protection, so that even if the feed liquid accidentally enters the bottom of the cavity, it will not enter the lower sealed space, avoiding corrosion of the transmission shaft and the drum shaft.

[0023] As a further limited technical solution: the drive shaft extends downward to the lower part of the drum, and the partition plate is an annular plate connected in the annular space between the drive shaft and the drum shaft; a bottom sealing plate is arranged between the lower part of the drum shaft and the lower part of the drive shaft, and a sealed space is formed between the bottom sealing plate and the annular plate; the partition plate is connected between the drive shaft and the drum shaft, and the torque transmission structure or the fixed connection structure comprises the partition plate, and / or the bottom sealing plate is connected between the drive shaft and the drum shaft, and the torque transmission structure or the fixed connection structure comprises the bottom sealing plate.

[0024] The beneficial effect of the above further limited technical solution is that the bottom sealing plate can provide a primary protection measure to provide better conditions for stable operation of the bearing, and can prevent the feed liquid from entering the drum shaft to affect the stable rotation of the drum.

[0025] As a further limited technical solution: the shell comprises an upper cover plate, the upper cover plate is provided with a mounting hole, and the bearing seat is connected at the mounting hole, and the setting position of the upper bearing in the height direction corresponds to the upper cover plate.

[0026] The beneficial effect of the above further limited technical solution is that the upper bearing can utilize the axial space occupied by the thickness of the upper cover plate, which is beneficial to further reduce the overall axial size of the centrifugal extractor.

[0027] As a further limited technical solution: the top of the bearing seat is provided with a connecting flange, which is supported on the upper cover plate and fixed with the upper cover plate.

[0028] The beneficial effect of the above further limited technical solution is that the connecting flange can ensure the reliable fixation of the bearing seat, provide a reliable support point for the bearing, and facilitate the installation of the bearing seat. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of embodiment 1 of a single support structure centrifuge of the present application;

[0030] Figure 2 is a structural schematic diagram of embodiment 2 of a single support structure centrifuge of the present application.

[0031] The names of the corresponding components corresponding to the corresponding reference signs in the figure are as follows: 11, upper cover plate; 12, drum mounting cavity; 21, drum; 22, drum shaft; 23, drive shaft; 24, partition plate; 25, cavity; 26, bottom cover plate; 31, bearing seat; 32, bearing lower gland; 33, bearing upper gland; 34, bearing lock nut; 35, spacer ring; 36, outer distance sleeve; 37, inner distance sleeve; 41, static seal ring; 42, dynamic seal ring; 43, colloidal seal ring; 44, upper seal ring; 51, upper bearing; 52, lower bearing; 61, drive motor; 62, motor support; 71, transmission protection cover; 81, cooling liquid flow channel; 91, air inlet channel; 92, air outlet channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application, that is, the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the specific embodiments of the present invention, terms such as "first" and "second" and other relational terms that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the phrase "including a ..." or other defined elements that may appear does not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0035] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood broadly. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] The present invention is described in further detail below with reference to the examples.

[0038] Example 1 of a single-support structure centrifuge of the present invention:

[0039] like Figure 1 As shown, a single-support structure centrifuge includes a shell and a drum 21. A drum installation cavity 12 is provided in the shell. The drum 21 is arranged in the drum installation cavity 12 and is rotatably assembled on the shell through a drum shaft 22.

[0040] The drum shaft 22 is fixedly mounted at the center of the drum 21, with its upper end corresponding to the top surface of the drum 21 and its lower end corresponding to the bottom surface of the drum 21. The drum shaft 22 is a hollow structure, housing a drive shaft 23 coaxially arranged with the drum shaft 22. The top end of the drive shaft 23 extends upward from the drum shaft 22, while the bottom end reaches the bottom of the drum 21. An annular space is formed between the drive shaft 23 and the drum shaft 22. An annular baffle plate 24 is provided near the top of the annular space, forming a cavity 25 at the top of the drum shaft 22. This cavity 25 has an opening at the top of the drum shaft 22, into which the corresponding bearing seat 31 is submerged. A bottom sealing plate 26 is provided between the bottom end of the drum shaft 22 and the bottom end of the drive shaft 23. The bottom sealing plate 26 forms a sealed space with the annular plate, preventing liquid in the housing from entering the bearing seat 31 through the drum shaft 22. At the same time, the partition plate 24 and the bottom sealing plate 26 form a fixed connection structure, which securely connects the drive shaft 23 to the drum shaft 22. In other embodiments, the partition plate 24 and the bottom sealing plate 26 may simply function as a seal, with the fixed connection structure formed by another specialized structure, such as a rigid connecting rod connecting the drum shaft 22 and the drive shaft 23. Alternatively, one of the partition plate 24 and the bottom sealing plate 26 may function as both a seal and a fixed connection structure.

[0041] The housing includes an upper sealing plate 11 at the top, which is provided with mounting holes for the corresponding bearing seat 31 to be fixedly mounted. The bearing seat 31 is cylindrical, with an outward-turned folded edge at the top, forming a connecting flange. The connecting flange is supported on the upper sealing plate 11 and fixedly connected to the upper sealing plate 11 by bolting, welding, riveting, etc. The center of the bearing seat 31 has a through hole extending vertically, through which the drive shaft 23 passes. The upper end of the drive shaft 23 extends through the bearing seat 31 and is connected to the drive motor 61, which serves as the drum drive device. The drive motor 61 is fixed to the upper sealing plate 11 via a motor bracket 62.

[0042] A lower bearing gland 32 is screwed to the bottom of the bearing seat 31. This gland 32 forms an upward-facing annular support surface for supporting the outer ring of the lower bearing 52. Two lower bearings 52 are provided to provide more stable radial support. A stop shoulder is provided on the drive shaft 23, forming an upward-facing annular support surface for supporting the inner ring of the lower bearing 52. An annular upper bearing gland 33 is fixed to the top of the bearing seat 31, compressing the outer ring of the upper bearing 51. The top of the drive shaft 23 is externally threaded for mounting a bearing locknut 34, which compresses the inner ring of the upper bearing 51 via a backing ring 35. An outer spacer sleeve 36 and an inner spacer sleeve 37 are installed between the upper bearing 51 and the lower bearing 52. The outer spacer sleeve 36 provides axial support between the outer rings of the upper bearing 51 and the outer rings of the lower bearing 52, while the inner spacer sleeve 37 provides axial support between the inner rings of the upper bearing 51 and the inner rings of the lower bearing 52, thereby achieving vertical spacing and axial positioning of the upper and lower bearings 51, 52. The weight of the drum 21 acts on the upper bearing 51 through the bearing lock nut 34 and backing ring 35. The upper bearing 51 is supported on the lower bearing 52 by the outer spacer sleeve 36, and the lower bearing 52 is supported on the bearing seat 31, thereby achieving vertical support for the drum 21. The lower bearing 52 is sunk below the top end surface of the drum 21 and can share the axial space with the drum 21, which is beneficial to reducing the axial height of the centrifugal extractor; the upper bearing 51 is set at a position in the height direction corresponding to the upper cover plate 11, which can ensure a larger spacing between the upper and lower bearings 52, and can minimize the additional space occupied by the bearing in the height direction, while relying on the upper cover plate 11 to form a more stable support.

[0043] Since the lower bearing 52 is arranged in the drum mounting cavity 12, and there is liquid in the drum mounting cavity 12, in order to protect the bearing, a static sealing ring 41 is fixed to the outer peripheral surface of the bearing seat 31, and a dynamic sealing ring 42 is fixed to the top of the drum 21. The static sealing ring 41 and the dynamic sealing ring 42 are stacked up and down, and the bottom surface of the static sealing ring 41 is provided with a ring groove, and the top surface of the dynamic sealing ring 42 is also provided with a ring groove. A labyrinth sealing structure is formed between the static sealing ring 41 and the dynamic sealing ring 42 through the ring groove. The labyrinth sealing structure constitutes a shaft inner cavity sealing structure, which can prevent the liquid in the drum mounting cavity 12 in the shell from entering the cavity 25 in the drum shaft 22, thereby avoiding contamination of the bearing. A colloid sealing ring 43 is provided between the lower end of the bearing seat 31 and the drive shaft 23. This colloid sealing ring 43 comprises a sleeve portion that fits upwardly over the bearing seat 31, and a sealing gasket portion arranged radially perpendicular to the drive shaft 23. The sealing gasket has a sealing perforation at its center. A wear-resistant bushing is provided on the drive shaft 23, and the outer circumference of the wear-resistant bushing seals against the wall of the sealing perforation, forming a bearing seal structure that further isolates the upper and lower bearings 51, 52 radially spaced between the bearing seat 31 and the drive shaft 23, providing further protection for the upper and lower bearings 51, 52. Furthermore, an upper sealing ring 44 is provided in the center hole of the bearing upper gland 33, which forms a sealing engagement with the outer circumference of the backing ring 35 on the drum shaft 22, sealing the top opening of the bearing seat 31.

[0044] To better protect the bearing, the bearing seat 31 is provided with an air inlet channel 91 and an air outlet channel 92. The bearing upper pressure cover 33 is provided with an air inlet connected to the air inlet channel 91 and an air outlet connected to the air outlet channel 92, so that gas can be introduced from below the lower bearing 52 to form a positive pressure environment in the bearing chamber. In this embodiment, the gas introduced is nitrogen to form a nitrogen seal. After the bearing seat 31 is sunk into the drum 21, the heat dissipation conditions deteriorate. To avoid excessive temperature rise caused by long-term operation of the bearing, the cylindrical wall of the bearing seat 31 is provided with a coolant flow channel 81 that folds back and forth upwards and downwards. The coolant flow channel 81 has a coolant inlet and a coolant outlet. The coolant inlet and the coolant outlet are connected to the radiator through cooling pipes to cool the bearing seat 31 and the bearing. It should be noted that only one coolant flow channel 81 can be seen in the figure, and the others are not cut away.

[0045] During assembly, the upper and lower bearings 51 and 52 are assembled into the bearing seat 31, the bearing seat 31 is secured to the upper sealing plate 11 on the housing, and the static seal ring 41 is secured to the bearing seat 31. The drum 21, along with the drum shaft 22, drive shaft 23, and dynamic seal ring 42, is then installed from bottom to top, with the drive shaft 23 passing through the lower bearing 52 and upper bearing 51 on the bearing seat 31. The bearing lock nut 34 is installed, and the drive shaft 23 is connected to the drive motor 61 via a coupling. This completes the assembly of the drum 21. When the centrifugal extractor is operating, the upper and lower bearings 51 and 52 form two axially spaced fulcrums on the top of the drum shaft 22, ensuring the operational stability of the drum 21. Furthermore, with the lower bearing 52 sunk into the drum 21 and the upper bearing 51 located in the mounting hole on the upper sealing plate 11, both save axial space, thereby facilitating a reduction in the height of the centrifugal extractor.

[0046] Example 2 of a single-support structure centrifuge of the present invention:

[0047] In embodiment 1, the drum driving device is coaxially arranged with the drum shaft 22. In this embodiment, Figure 2 As shown, the drum drive device is offset to one side of the upper bearing 51 and arranged parallel to the drum shaft 22. The output shaft of the drum drive device is connected to the drum shaft 22 via a transmission mechanism and is protected by a transmission protective cover 71. The transmission mechanism can be a belt drive, gear drive, etc.

[0048] Example 3 of a single-support structure centrifuge of the present invention:

[0049] The difference between this embodiment and embodiment 1 is that in embodiment 1, the cavity 25 for the bearing seat 31 to be sunken is set on the top of the drum shaft 22. In this embodiment, only the bottom end of the drum shaft 22 is closed, and the cavity 25 is formed by the entire inner cavity of the drum shaft 22.

[0050] Example 4 of a single-support structure centrifuge of the present invention:

[0051] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the upper bearing 51 and the lower bearing 52 are arranged in the radial interval between the bearing seat 31 and the driving shaft 23, and the fixed connection structure formed by the partition plate 24 and the bottom sealing plate 26 is arranged between the driving shaft 23 and the drum shaft 22, so that the weight of the drum 21 can act on the bearing through the drum shaft 22, the fixed connection structure and the driving shaft 23. In the embodiment, the upper bearing 51 and the lower bearing 52 are arranged in the radial interval between the bearing seat 31 and the drum shaft 22, and the driving shaft 23 can only drive the drum 21 to rotate, because the bearing can directly provide axial support and radial support for the drum shaft 22. In the embodiment, the driving shaft 23 and the drum shaft 22 are in a split form, the driving shaft 23 is connected with the partition plate 24 on the drum shaft 22 through a key structure to form a torque transmission structure. Alternatively, the driving shaft 23 is connected with the partition plate 24 and the bottom sealing plate 26 on the drum shaft 22 through a key structure to form a torque transmission structure. Alternatively, one of the partition plate 24 and the bottom sealing plate 26 can play the role of sealing and torque transmission structure.

[0052] In other embodiments, when the upper bearing 51 and the lower bearing 52 are arranged in the radial interval between the bearing seat 31 and the drum shaft 22, the fixed connection structure formed by the partition plate 24 and the bottom sealing plate 26 can also be used as a torque transmission structure.

[0053] Embodiment 5 of the single support structure centrifuge of the application:

[0054] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the shaft inner cavity sealing structure between the drum shaft 22 and the bearing seat 31 is formed by a labyrinth sealing structure. In the embodiment, a sealing ring is arranged in the radial interval between the drum shaft 22 and the bearing seat 31, and the shaft inner cavity sealing structure is formed by the sealing ring.

[0055] Embodiment 6 of the single support structure centrifuge of the application:

[0056] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, only the lower bearing 52 is sunk into the drum 21. In the embodiment, both the lower bearing 52 and the upper bearing 51 are sunk into the drum 21.

[0057] Embodiment 7 of the single support structure centrifuge of the application:

[0058] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the upper bearing 51 corresponds to the upper sealing plate 11 on the shell. In the embodiment, the upper bearing 51 is located above the upper sealing plate 11.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A single-support structure centrifuge, comprising a housing, a drum (21) assembled in the housing, a drum shaft (22) provided at the axis of the drum (21), an upper bearing (51) and a lower bearing (52) spaced apart in the vertical direction corresponding to the top of the drum shaft (22), and a bearing seat (31) for mounting the upper bearing (51) and the lower bearing (52) on the housing; characterized in that: A cavity (25) is provided in the drum shaft (22), the top of the cavity (25) having an opening located at the top end of the drum shaft (22), and a bearing seat (31) cantilevered downward and entering the cavity (25); the bearing seat (31) is cylindrical and has a through hole extending up and down, and a drive shaft (23) for connecting to a drum drive device to drive the drum (21) to rotate is passed through the through hole; The upper bearing (51) and the lower bearing (52) are arranged in a radial interval between the bearing seat (31) and the drive shaft (23), and a fixed connection structure is provided between the drive shaft (23) and the drum shaft (22); or, the upper bearing (51) and the lower bearing (52) are arranged in a radial interval between the bearing seat (31) and the drum shaft (22), and a torque transmission structure for driving the drum (21) to rotate is provided between the drive shaft (23) and the drum shaft (22); Of the upper bearing (51) and the lower bearing (52), at least the lower bearing (52) is located below the top end surface of the rotating drum (21).

2. A single support structure centrifuge according to claim 1, characterized in that: A shaft inner cavity sealing structure is provided between the drum shaft (22) and the bearing seat (31) to prevent the liquid in the drum installation cavity (12) in the housing from entering the cavity (25) in the drum shaft (22).

3. A single support structure centrifuge according to claim 2, characterized in that: The shaft inner cavity sealing structure comprises a static sealing ring (41) fixed on the outer peripheral surface of the bearing seat (31) and a dynamic sealing ring (42) fixed on the top of the drum (21), and a labyrinth sealing structure is formed between the static sealing ring (41) and the dynamic sealing ring (42).

4. A single support structure centrifuge according to claim 1, 2 or 3, characterized in that: A bearing sealing structure is provided between the lower end of the bearing seat (31) and the drive shaft (23), for isolating and protecting an upper bearing (51) and a lower bearing (52) arranged in a radial interval between the bearing seat (31) and the drive shaft (23).

5. A single support structure centrifuge according to claim 1, 2 or 3, characterized in that: A bearing upper pressure cover (33) is provided on the top of the bearing seat (31), and an air inlet and an air outlet are provided on the bearing upper pressure cover (33) so as to introduce gas into the bearing chamber formed by the bearing seat (31) to form a positive pressure environment in the bearing chamber.

6. A single support structure centrifuge according to claim 1, 2 or 3, characterized in that: A coolant flow channel is provided in the bearing seat (31), and the coolant flow channel has a coolant inlet and a coolant outlet, and the coolant inlet and the coolant outlet are connected to the radiator through a cooling pipeline.

7. A single support structure centrifuge according to claim 1, 2 or 3, characterized in that: A sealing plate (24) is provided at the bottom of the cavity (25) for separating the cavity (25) from the lower space.

8. The single-support structure centrifuge according to claim 7, characterized in that: The drive shaft (23) extends downward to the lower part of the drum (21), and the baffle plate (24) is an annular plate connected in the annular space between the drive shaft (23) and the drum shaft (22); a bottom sealing plate (26) is provided between the lower part of the drum shaft (22) and the lower part of the drive shaft (23), and a closed space is formed between the bottom sealing plate (26) and the annular plate, the baffle plate (24) is connected between the drive shaft (23) and the drum shaft (22), the torque transmission structure or the fixed connection structure includes the baffle plate (24), and / or the bottom sealing plate (26) is connected between the drive shaft (23) and the drum shaft (22), and the torque transmission structure or the fixed connection structure includes the bottom sealing plate (26).

9. A single support structure centrifuge according to claim 1, 2 or 3, characterized in that: The housing comprises an upper sealing plate (11), the upper sealing plate (11) is provided with a mounting hole, the bearing seat (31) is connected to the mounting hole, and the upper bearing (51) is arranged at a position corresponding to the upper sealing plate (11) in the height direction.

10. The single-support structure centrifuge according to claim 9, characterized in that: A connecting flange is provided on the top of the bearing seat (31), and the connecting flange is supported on and fixed to the upper sealing plate.

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