Centrifugal machine with single supporting structure

Abstract

The invention relates to a centrifugal extractor, in particular to a centrifugal machine with a single supporting structure. The rotary drum assembly structure of the centrifugal extractor comprises a shell and a rotary drum, a rotary drum rotating shaft is arranged at the axis of the rotary drum, the rotary drum assembly structure further comprises an upper bearing and a lower bearing which correspond to the top of the rotary drum rotating shaft and are arranged at intervals in the vertical direction, and a bearing seat is arranged on the shell; a cavity is formed in the rotary drum rotating shaft, and the bearing seat overhangs downwards and enters the cavity; the bearing seat is cylindrical and is provided with a through hole extending up and down, and a driving shaft is arranged in the through hole in a penetrating manner; the upper bearing and the lower bearing are arranged in a radial interval between the bearing seat and the driving shaft, and a fixed connection structure is arranged between the driving shaft and the rotary drum rotating shaft; or, the upper bearing and the lower bearing are arranged in the radial interval between the bearing seat and the rotary drum rotating shaft, and a torque transmission structure is arranged between the driving shaft and the rotary drum rotating shaft; at least the lower bearing is located below the top end face of the drum. The centrifugal extractor can solve the problem that an existing centrifugal extractor occupies a large axial space.

Description

Technical Field

[0001] The invention relates to a centrifugal extractor, in particular to a centrifugal extractor with a single supporting structure. Background Art

[0002] The current centrifugal extractor generally includes a housing, a drum rotatably assembled in the housing, a drum shaft is arranged at the axis of the drum, and the drum is rotatably assembled in the housing through the drum shaft. There are two main forms of rotating assembly of the drum on the housing: one is single-point support, that is, only a bearing is arranged at the top of the drum shaft, and the drum is hoisted on the housing through the drum bearing; the other is double-point support, that is, an upper bearing is arranged at the top of the drum shaft to form an upper fulcrum, and a lower bearing is arranged at the bottom of the drum shaft extending out of the drum to form a lower fulcrum.

[0003] The drum shaft of a large-flow centrifugal extractor has a large load. If a single-pivot support is used on the top, the overhang length of the drum shaft is too long, and it is difficult to ensure operational stability. Therefore, generally only an upper and lower double-pivot support structure can be used. For example, the upper bearing and lower bearing structure used in the liquid-liquid two-phase mixing-separation device disclosed in the Chinese utility model patent with authorization announcement number CN201899900U, in which the lower bearing is arranged on the bearing seat at the bottom of the shell. The upper and lower double-pivot support structure will cause the lower bearing to be located at the bottom of the equipment and buried in the material, which requires a sealing structure to be set above the lower bearing. In order to meet the rotation assembly requirements and sealing effect, the sealing structure generally uses a mechanical seal. However, the setting of a mechanical seal will complicate the bottom structure of the equipment, and the mechanical seal is a consumable part that needs to be replaced frequently. Each replacement requires the equipment to be shut down for a long time, which will greatly increase maintenance costs and reduce 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 will occupy a certain axial space, resulting in a higher height of the centrifugal extractor, which in turn causes transportation difficulties. Especially for export models, they generally need to be transported by container, and the height of some large-flow centrifugal extractors is often higher than the maximum height of 2698mm of international standard containers, which makes internationalization difficult.

[0004] In order to solve the problem of easy failure of mechanical seals, a centrifugal extractor drum disclosed in a Chinese utility model patent with authorization announcement number CN206715372U adopts an upper suspension structure, and an upper bearing and a lower bearing are respectively fixed at the upper and lower ends of the bearing seat at the top of the shell. The upper bearing and the lower bearing are separated by a certain distance, and two upper and lower spaced fulcrums are formed on the top of the drum shaft (i.e., the driving long axis in the centrifugal extractor drum disclosed in the above patent), which increases the span of the support points, can reduce the radial force of the bearing, and is conducive to ensuring the stability of the drum shaft and the drum during rotation. Although this upper suspension structure can solve the problem of easy failure of the mechanical seal at the bottom of the drum, the spacing between the upper bearing and the lower bearing also directly increases the height of the centrifugal extractor, which also leads to the problem of transportation difficulties. Summary of the invention

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

[0006] The present invention provides a centrifuge with a single support structure, which adopts the following technical solution:

[0007] A single-support structure centrifuge comprises a shell, a drum assembled in the shell, a drum shaft is arranged at the axis of the drum, the drum assembly structure further comprises an upper bearing and a lower bearing arranged in a vertical direction at intervals corresponding to the top of the drum shaft, and a bearing seat for mounting the upper bearing and the lower bearing is arranged on the shell; a cavity is arranged in the drum shaft, the top of the cavity has an opening located at the top of the drum shaft, the bearing seat is suspended downward and enters the cavity; the bearing seat is cylindrical, has a through hole extending up and down, and a drive shaft for connecting a drum driving device to drive the drum to rotate is penetrated in the through hole;

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

[0009] Of the upper bearing and the lower bearing, at least the lower bearing is located below the top end surface of the drum.

[0010] The beneficial effect of the above technical solution is that the cavity arranged 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 occupation of 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 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 used 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 weight of the drum can also be transmitted to the bearing through the transmission path of the drum shaft, the fixed connection structure, and the drive shaft through the fixed connection structure, 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 shaft inner cavity sealing structure is provided to meet the protection requirements of the bearing after it sinks into the drum, thereby preventing the bearing from being contaminated by the slurry and unable to work normally and shortening its service life, which is beneficial to reducing the number of maintenance operations and protecting the drum shaft from corrosion caused by 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 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 a bearing sealing structure can further isolate the upper bearing and the lower bearing, which is beneficial to ensuring the reliable and stable operation of the bearing.

[0017] As a further limited technical solution: a bearing upper pressure cover is provided on the top of the bearing seat, and an air inlet and an air outlet are provided on the bearing upper pressure cover 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 technical solution further defined above 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, thereby improving the protection performance of the bearing chamber and ensuring the working stability of the centrifugal extractor.

[0019] As a further limited technical solution: a coolant flow channel is provided in the bearing seat, 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.

[0020] The beneficial effect of the technical solution further defined above is that it can improve the deterioration of the heat dissipation environment caused by the bearing sinking into the drum, and avoid excessive accumulation of heat generated when the bearing rotates, thereby affecting the life of the bearing and the temperature of the slurry.

[0021] As a further limited technical solution: a sealing plate is provided at the bottom of the cavity to separate the cavity from the lower space.

[0022] The beneficial effect of the technical solution further defined above is that the provision of a baffle plate can prevent the slurry in the shell from entering the cavity from the bottom end of the drum shaft, further protect the bearing, and form secondary protection. When the slurry accidentally enters the bottom of the cavity, it will not enter the sealed space below, thereby preventing the transmission shaft and the drum shaft from being corroded.

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

[0024] The beneficial effect of the technical solution further defined above is that the provision of a bottom sealing plate can add a level of protection measure, provide better conditions for the stable operation of the bearing, and prevent the slurry from entering the drum shaft and affecting the stable rotation of the drum.

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

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

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

[0028] The beneficial effect of the technical solution further defined above is that the bearing seat can be reliably fixed by the connecting flange, a reliable support point is provided for the bearing, and the installation of the bearing seat is facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of Example 1 of a single-support structure centrifuge of the present invention;

[0030] Figure 2 It is a structural schematic diagram of Example 2 of a single-support structure centrifuge of the present invention.

[0031] The names of the components corresponding to the corresponding reference numerals in the figure are: 11. upper sealing plate; 12. drum mounting cavity; 21. drum; 22. drum shaft; 23. drive shaft; 24. partition plate; 25. cavity; 26. bottom sealing plate; 31. bearing seat; 32. bearing lower pressure cover; 33. bearing upper pressure cover; 34. bearing locking nut; 35. gasket; 36. outer distance sleeve; 37. inner distance sleeve; 41. static sealing ring; 42. dynamic sealing ring; 43. colloid sealing ring; 44. upper sealing ring; 51. upper bearing; 52. lower bearing; 61. drive motor; 62. motor bracket; 71. transmission protection cover; 81. coolant flow channel; 91. air inlet channel; 92. air outlet channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the specific implementation of the present invention, the terms that may appear, such as "first" and "second", etc., 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, the terms that may appear, such as "include", "comprise" or any other variants thereof, are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 ..." and other defined elements that may appear do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention is further described in detail below in conjunction with examples.

[0038] Embodiment 1 of a centrifuge with a single support structure according to 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 arranged at the axis of the drum 21, the upper end of the drum shaft 22 corresponds to the top surface of the drum 21, and the lower end corresponds to the bottom surface of the drum 21. The drum shaft 22 is a hollow structure, and a drive shaft 23 is arranged coaxially with the drum shaft 22 inside. The top of the drive shaft 23 extends upward from the drum shaft 22, and the bottom end extends to the bottom end of the drum 21. An annular space is formed between the drive shaft 23 and the drum shaft 22, and an annular sealing plate 24 is provided at the upper part of the annular space. A cavity 25 is formed at the top of the drum shaft 22, and the cavity 25 has an opening located at the top of the drum shaft 22 for the corresponding bearing seat 31 to sink into. 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, and a closed space is formed between the bottom sealing plate 26 and the annular plate, which can prevent the liquid in the shell from entering the bearing seat 31 from the drum shaft 22. At the same time, the sealing plate 24 and the bottom sealing plate 26 form a fixed connection structure, so that the drive shaft 23 is fixedly connected to the drum shaft 22. In other embodiments, the sealing plate 24 and the bottom sealing plate 26 can only play a sealing and sealing role, and the fixed connection structure is formed by other special structures, such as a rigid connecting rod connected between the drum shaft 22 and the drive shaft 23. Or one of the sealing plate 24 and the bottom sealing plate 26 plays both a sealing and sealing role and a fixed connection structure.

[0041] The housing includes an upper sealing plate 11 located at the top, and a mounting hole is provided on the upper sealing plate 11 for the corresponding bearing seat 31 to be fixedly installed. The bearing seat 31 is cylindrical, and an outward folding edge is provided at the top to form a connecting flange, which is supported on the upper sealing plate 11 and fixedly connected to the upper sealing plate 11, and the fixed connection method can be bolt connection, welding, riveting, etc. The center of the bearing seat 31 has a through hole extending up and down, and the drive shaft 23 passes through the through hole. The upper end of the drive shaft 23 passes through the bearing seat 31 and is transmission-connected to the drive motor 61 as a drum driving device, and the drive motor 61 is fixed to the upper sealing plate 11 through a motor bracket 62.

[0042] The bottom of the bearing seat 31 is fixed with a bearing lower pressure cover 32 by screws. The bearing lower pressure cover 32 forms an upward annular support surface for supporting the outer ring of the lower bearing 52. Two lower bearings 52 are provided to form a more stable radial support; the drive shaft 23 is provided with a limiting shoulder, which forms an upward annular support surface for supporting the inner ring of the lower bearing 52. The top of the bearing seat 31 is fixed with an annular bearing upper pressure cover 33 for pressing the outer ring of the upper bearing 51. The top of the drive shaft 23 is provided with an external thread for assembling a bearing locking nut 34. The bearing locking nut 34 presses the inner ring of the upper bearing 51 through a gasket 35. At the same time, an outer distance sleeve 36 and an inner distance sleeve 37 are provided between the upper bearing 51 and the lower bearing 52. The outer distance sleeve 36 is used to realize the axial support between the outer ring of the upper bearing 51 and the outer ring of the lower bearing 52, and the inner distance sleeve 37 is used to realize the axial support between the inner ring of the upper bearing 51 and the inner ring of the lower bearing 52, so as to realize the upper and lower spacing arrangement and axial positioning of the upper bearing 51 and the lower bearing 52. The weight of the drum 21 acts on the upper bearing 51 through the bearing locking nut 34 and the washer 35, and the upper bearing 51 is supported on the lower bearing 52 by the outer distance sleeve 36, and the lower bearing 52 is supported on the bearing seat 31, thereby realizing the vertical support of 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 arranged at a position in the height direction corresponding to the upper sealing plate 11, which can make a larger spacing between the upper and lower bearings 52, and can minimize the additional space occupied in the height direction by the bearing arrangement, while being able to rely on the upper sealing plate 11 to form a more stable support.

[0043] Since the lower bearing 52 is arranged in the drum installation cavity 12, and there is liquid in the drum installation 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 an annular groove, and the top surface of the dynamic sealing ring 42 is also provided with an annular groove. A labyrinth sealing structure is formed between the static sealing ring 41 and the dynamic sealing ring 42 through the annular groove. The labyrinth sealing structure constitutes a shaft inner cavity sealing structure, which can prevent the liquid in the drum installation 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. The colloid sealing ring 43 includes a sleeve portion that is upwardly sleeved on the bearing seat 31, and also includes a sealing gasket portion that is radially arranged perpendicular to the drive shaft 23. A sealing through hole is provided at the center of the sealing gasket. A wear-resistant bushing is provided on the drive shaft 23. The outer peripheral surface of the wear-resistant bushing is sealed with the hole wall of the sealing through hole, forming a bearing sealing structure for further isolating the upper bearing 51 and the lower bearing 52 that are arranged in the radial interval between the bearing seat 31 and the drive shaft 23, and further protecting the upper bearing 51 and the lower bearing 52. In addition, an upper sealing ring 44 is provided at the center hole of the upper pressure cover 33 of the bearing, which forms a sealing match with the outer peripheral surface of the gasket 35 on the drum shaft 22, and can close the top opening of the bearing seat 31.

[0044] In order to better protect the bearing, an air inlet channel 91 and an air outlet channel 92 are provided on the bearing seat 31, and an air inlet connected to the air inlet channel 91 and an air outlet connected to the air outlet channel 92 are provided on the bearing upper pressure cover 33, so as to introduce gas 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 sinks into the drum 21, the heat dissipation condition becomes worse. In order to avoid excessive temperature rise caused by long-term operation of the bearing, the wall of the bearing seat 31 is provided with a coolant flow channel 81 that is folded up and down. 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 a cooling pipeline 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 rest are not cut.

[0045] During assembly, the upper bearing 51 and the lower bearing 52 are assembled into the bearing seat 31, the bearing seat 31 is fixed to the upper sealing plate 11 on the housing, and the static sealing ring 41 is fixed to the bearing seat 31; then, the drum 21 together with the drum shaft 22, the drive shaft 23, and the dynamic sealing ring 42 are installed from bottom to top, so that the drive shaft 23 passes through the lower bearing 52 and the upper bearing 51 on the bearing seat 31, the bearing locking nut 34 is installed, and the drive shaft 23 is connected to the drive motor 61 through the coupling, and the assembly of the drum 21 is completed. When the centrifugal extractor is working, the upper bearing 51 and the lower bearing 52 form two axially spaced fulcrums on the top of the drum shaft 22, which can ensure the running stability of the drum 21, and the lower bearing 52 is sunk into the drum 21 and the upper bearing 51 is located in the mounting hole on the upper sealing plate 11, which can save axial space, thereby helping to reduce the height of the centrifugal extractor.

[0046] Embodiment 2 of a centrifuge with a single support structure according to the present invention:

[0047] In Example 1, the drum driving device is coaxially arranged with the drum shaft 22. In this embodiment, Figure 2 As shown, the drum driving 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 driving device is connected to the drum shaft 22 through a transmission mechanism, and a transmission protection cover 71 is provided for protection. The transmission mechanism can be a belt drive, a gear drive, etc.

[0048] Embodiment 3 of a centrifuge with a single support structure according to 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 sink into is arranged at 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] Embodiment 4 of a centrifuge with a single support structure according to the present invention:

[0051] The difference between this embodiment and the first embodiment is that in the first embodiment, the upper bearing 51 and the lower bearing 52 are arranged in the radial interval between the bearing seat 31 and the drive shaft 23, and a fixed connection structure formed by a baffle plate 24 and a bottom sealing plate 26 is provided between the drive shaft 23 and the drum shaft 22, so that the deadweight of the drum 21 can act on the bearings through the drum shaft 22, the fixed connection structure, and the drive shaft 23. In the present 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 since the bearings can directly form axial and radial support for the drum shaft 22, the drive shaft 23 can only play the role of driving the drum 21 to rotate. In the present embodiment, the drive shaft 23 and the drum shaft 22 are in a split form, and the drive shaft 23 is connected to the baffle plate 24 on the drum shaft 22 through a key structure to form a torque transmission structure. Alternatively, the drive shaft 23 is connected to the baffle 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 sealing plate 24 and the bottom sealing plate 26 serves as both a sealing and sealing function and a 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 sealing plate 24 and the bottom sealing plate 26 can also be used as the torque transmission structure.

[0053] Embodiment 5 of a centrifuge with a single support structure according to the present invention:

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

[0055] Embodiment 6 of a centrifuge with a single support structure according to the present invention:

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

[0057] Embodiment 7 of a centrifuge with a single support structure according to the present invention:

[0058] The difference between this embodiment and the first embodiment is that in the first embodiment, the upper bearing 51 corresponds to the upper sealing plate 11 on the housing. In the present 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 patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A centrifuge with a single support structure, comprising a housing, a drum (21) assembled in the housing, a drum shaft (22) being arranged at the axis of the drum (21), an upper bearing (51) and a lower bearing (52) being arranged at intervals in the up-down 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) being arranged on the housing; characterized in that: A cavity (25) is provided in the drum shaft (22), the top of the cavity (25) has an opening located at the top of the drum shaft (22), and a bearing seat (31) is suspended downward and enters the cavity (25); the bearing seat (31) is cylindrical and has a through hole extending up and down, and a driving shaft (23) for connecting to a drum driving 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 rotating shaft (22) of the rotating drum; or, the upper bearing (51) and the lower bearing (52) are arranged in a radial interval between the bearing seat (31) and the rotating shaft (22) of the rotating drum, and a torque transmission structure for driving the rotating drum (21) to rotate is provided between the drive shaft (23) and the rotating 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 allow gas to be introduced into the bearing chamber formed by the bearing seat (31) so as 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: The bearing seat (31) is provided with a coolant flow channel, 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. A 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. A 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.

Images