Rotor assembly, motor and centrifugal machine

Abstract

The invention relates to the technical field of centrifugal machines, particularly provides a rotor assembly, a motor and a centrifugal machine, and at least solves the problem that an existing rotor assembly is inconvenient to assemble and disassemble. The rotor assembly provided by the invention comprises a rotor main body and a locking part, a through mounting cavity is formed in the middle of the rotor main body, and the inner side wall of the rotor main body comprises a conical working surface; the locking component comprises a limiting piece, a pressing piece, an elastic piece and a rolling piece, the limiting piece is connected with the rotor main body, and the limiting piece is provided with a limiting surface facing the mounting cavity; the elastic piece and the pressing piece are both installed in the installation cavity, one end of the elastic piece is connected with the limiting surface, and the other end of the elastic piece is connected with the pressing piece. The rolling piece is arranged in the mounting cavity and abuts against the position between the inner wall of the mounting cavity and the bottom of the pressing piece so that the rolling piece can be clamped into the limiting groove of the motor shaft in the process that the end of the motor shaft is inserted into the mounting cavity, and the rotor body and the motor shaft can be connected in a clamped mode. The device has the advantages of being easy to operate and convenient to install.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuges, and particularly provides a rotor assembly, a motor, and a centrifuge. Background Art

[0002] The traditional method of installing a rotor is to fix the rotor to the drive head through bolts and then fixedly connect the drive head to the motor shaft. This installation method has low efficiency. To improve the installation efficiency, a replacement device is provided on the rotor. The replacement device mainly relies on the sliding of a slider inside a slide rail and uses the movement of the slider to clamp or release the rotor, thereby achieving the quick connection and disengagement of the rotor and the drive head. Among them, the slide rail is a smooth notch structure machined inside the drive head, and the slider is assembled to the slide rail through the interference fit of a pin.

[0003] However, as a small precision component with high strength and high wear resistance requirements, the manufacturing requirements of the drive head are extremely strict, resulting in the processing and assembly processes of the slide rail and the slider being not only costly but also time-consuming and laborious. In addition, due to the very small clearance between the slider and the slide rail, if the rotor is installed on the drive head and used for a long time, the surface of the slider may rust or accumulate impurities due to environmental factors. These problems will hinder the smooth expansion and contraction of the slider, making it difficult to remove the rotor smoothly, thus affecting the disassembly efficiency between the rotor and the motor shaft. Moreover, since the slider is assembled to the drive head through an interference fit, once the slider is damaged, it is impossible to replace the slider alone, and only the entire drive head can be replaced forcedly. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve at least one of the problems of inconvenient installation and disassembly, high processing cost, and high replacement cost of the existing rotor assembly.

[0005] In a first aspect, the present invention provides a rotor assembly. A limiting groove recessed radially inward is provided at a position near the end of a motor shaft adapted to the rotor assembly. The rotor assembly includes a rotor body and a locking component. A through installation cavity is formed in the middle of the rotor body, and the inner side wall of the rotor body includes a conical working surface. The locking component includes a limiting member, a pressing member, an elastic member, and a rolling member. The limiting member is connected to the rotor body, and the limiting member has a limiting surface facing the installation cavity. The elastic member and the pressing member are both installed in the installation cavity. One end of the elastic member is connected to the limiting surface, and the other end is connected to the pressing member. The rolling member is placed in the installation cavity and abuts between the inner wall of the installation cavity and the bottom of the pressing member, so that during the process of inserting the end of the motor shaft into the installation cavity, the rolling member can be caught in the limiting groove to clamp the rotor body and the motor shaft.

[0006] In some feasible embodiments of the above-mentioned rotor assembly, the rotor assembly further includes an unlocking component, which includes a movable member and a handle connected to the movable member. The movable member is movably installed in the installation cavity and adapted to the conical working surface. The handle extends outside the installation cavity to drive the rolling member to disengage from the limiting groove by means of the handle during the unlocking process.

[0007] In some feasible embodiments of the above-mentioned rotor assembly, the movable member includes a conical cylinder structure, which is adapted to the conical working surface, and a slideway for guiding the movement direction of the rolling member is formed on the conical cylinder structure.

[0008] In some feasible embodiments of the above-mentioned rotor assembly, the limiting member includes a connecting portion and a limiting portion. The limiting surface is formed on the limiting portion, and the limiting portion is connected to the rotor main body through the connecting portion.

[0009] In some feasible embodiments of the above-mentioned rotor assembly, a slit for the handle to pass through is constructed between the limiting portion and the connecting portion to restrict the circumferential rotation of the movable member relative to the installation cavity by means of the slit.

[0010] In some feasible embodiments of the above-mentioned rotor assembly, the connecting portion is constructed with a first through hole corresponding to the installation cavity, and the limiting portion is located above the first through hole and thus constructs the slit.

[0011] In some feasible embodiments of the above-mentioned rotor assembly, there are multiple rolling members; and / or

[0012] The pressing member is provided with a second through hole for the motor shaft to pass through; and / or

[0013] The rotor assembly further includes a bottom support, which is detachably connected to the bottom of the rotor main body, and the bottom support is provided with a third through hole for the motor shaft to pass through.

[0014] In a second aspect, the present invention further provides a motor, which includes a motor shaft capable of being adapted to the rotor assembly in any one of the foregoing technical solutions. A limiting groove recessed radially inward is provided at a position near the end of the motor shaft.

[0015] In some feasible embodiments of the above-mentioned motor, the motor shaft includes a shaft body and a fitting head, and the fitting head is arranged at the end of the shaft body; the fitting head includes a clamping portion and an insertion portion connected in sequence along the direction away from the shaft body; a limiting groove is formed by the depression of the side wall of the clamping portion; the diameter of the cross-section of the insertion portion gradually decreases along the direction away from the clamping portion; and / or, the fitting head includes a driving portion adapted to the rotor body, and the cross-section of the driving portion is non-circular.

[0016] In a third aspect, the present invention further provides a centrifuge, which includes the rotor assembly described in any one of the foregoing technical solutions; and / or

[0017] The centrifuge includes the motor described in any one of the foregoing technical solutions.

[0018] Advantages of the present invention:

[0019] (1) During the assembly process, when the motor shaft is inserted into the rotor body through the through installation cavity, the front end of the motor shaft first contacts the rolling element and is blocked. However, under the continuous action of an external force, the motor shaft pushes the rolling element and drives the pressing element to move upward in the installation cavity. At the same time, the elastic element is also compressed. Also, due to the unique tapered working surface design of the installation cavity, the rolling element will expand outward while moving upward along the tapered working surface. When the rolling element moves to a certain height along the tapered working surface, the constraint effect of the rolling element on the motor shaft is automatically released, and the motor shaft can smoothly pass over the rolling element and continue to extend. At this time, the elastic element uses its inherent elastic restoring force to drive the rolling element to move downward along the tapered working surface until the rolling element is pushed into the limiting groove of the motor shaft, thereby realizing the clamping and fixing of the motor shaft and the rotor body. The entire assembly process does not require additional fixing tools, and has the advantages of simple operation and convenient installation.

[0020] (2) After the rolling element is pushed into the limiting groove of the motor shaft, the restoring force of the elastic element enables the rolling element to closely fit in the limiting groove, thereby forming a firm clamping and fixing, ensuring the stable connection between the motor shaft and the rotor body, effectively preventing the loosening or falling off of the motor shaft during operation, contributing to improving the overall reliability of the centrifuge, and reducing the failures caused by improper assembly or loose connection.

[0021] (3) In addition, the cooperation of the rolling element and the elastic element also has a certain shock absorption effect, which can, to a certain extent, protect the motor shaft and the rotor body from the influence of external shocks. Description of the Drawings

[0022] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0023] Figure 1Schematic three-dimensional structure diagram of the rotor assembly and the motor shaft after assembly according to an embodiment of the present invention;

[0024] Figure 2 Cross-sectional view of the rotor assembly and the motor shaft before assembly according to an embodiment of the present invention;

[0025] Figure 3 Partial enlarged view at A before the rotor assembly and the motor shaft are assembled (i.e., the first state) according to an embodiment of the present invention;

[0026] Figure 4 Partial enlarged view at A during the assembly of the rotor assembly and the motor shaft (i.e., the second state) according to an embodiment of the present invention;

[0027] Figure 5 Partial enlarged view at A after the rotor assembly and the motor shaft are assembled (i.e., the third state) according to an embodiment of the present invention;

[0028] Figure 6 Connection schematic diagram of the locking component and the unlocking component according to an embodiment of the present invention;

[0029] Figure 7 Exploded view of the locking component and the unlocking component according to an embodiment of the present invention;

[0030] Figure 8 Cross-sectional view of the motor shaft according to an embodiment of the present invention.

[0031] Explanation of reference numerals:

[0032] 1. Rotor assembly; 11. Rotor body; 111. Installation cavity; 112. Driving hole; 12. Locking component; 121. Limiting member; 1211. Connecting portion; 1212. Limiting portion; 1213. Anti-disengagement portion; 1214. First through hole; 1215. Slit; 122. Elastic member; 123. Pressing member; 1231. Second through hole; 124. Rolling member; 13. Unlocking component; 131. Moving member; 1311. Slideway; 132. Handle; 1321. Extension portion; 1322. Holding portion; 14. Bottom bracket; 141. Third through hole; 2. Motor shaft; 21. Shaft body; 22. Assembly head; 221. Clamping portion; 2211. Limiting groove; 222. Insertion portion; 223. Driving portion. Detailed implementation manners

[0033] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios. In order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some specific details.

[0034] In the description of the present invention, terms indicating directions or positional relationships such as "upper", "lower", "inner", "outer", "left", "right", "front", "rear", etc. are based on the directions or positional relationships in actual applications. This is only for convenience of description and does not indicate or imply that the device to be protected must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, ordinal numbers such as "first" and "second" are only for convenience of description and do not indicate or imply relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] Please refer to Figures 1 to 7 , the present invention provides a rotor assembly. The rotor assembly 1 is adapted to a motor shaft 2 with a limiting groove 2211. The rotor assembly 1 includes a rotor main body 11 and a locking member 12.

[0037] It should be noted that Figure 3 is a partial enlarged view of the rotor assembly 1 and the motor shaft 2 at A before assembly, that is, the enlarged view A1 in the first state; Figure 4 is a partial enlarged view of the rotor assembly 1 and the motor shaft 2 at A during assembly, that is, the enlarged view A2 in the second state; Figure 5 is a partial enlarged view of the rotor assembly 1 and the motor shaft 2 at A after assembly, that is, the enlarged view A3 in the third state.

[0038] As Figures 2 to 5 shown, a through installation cavity 111 is formed in the middle of the rotor main body 11. The inner side wall of the installation cavity 111 includes a conical working surface. Among them, the diameter of the conical working surface gradually increases along the direction in which the motor shaft 2 is inserted into the rotor main body 11 (that is, Figure 2 the upward direction from bottom to top in

[0039] Specifically, asFigure 3 , Figure 4 and Figure 5 As shown in any one of Figure 3 , Figure 4 , and Figure 5 , the longitudinal section profile of the conical working surface is an inverted trapezoid. The installation cavity 111 further includes a through installation hole formed below the conical working surface, and the installation hole facilitates guiding the end of the motor shaft 2 to pass through and enter the upper space. The installation cavity 111 further includes a cylindrical portion that is open and communicates with the space corresponding to the conical working surface and is formed above the conical working surface. The cylindrical portion and the space portion corresponding to the conical working surface together form a space for installing elastic members 122, pressing members 123, etc.

[0040] As Figures 3 to 7 shown, the locking member 12 includes a limiting member 121, a pressing member 123, an elastic member 122, and a rolling member 124.

[0041] Among them, the limiting member 121 is connected to the rotor main body 11, and the limiting member 121 has a limiting surface facing the installation cavity 111. Specifically, the limiting member 121 includes a connecting portion 1211 and a limiting portion 1212. The limiting surface is formed on the limiting portion 1212. The limiting portion 1212 is connected to the rotor main body 11 through the connecting portion 1211. The limiting portion 1212 is disposed directly above the installation cavity 111 so that the limiting surface faces the installation cavity 111.

[0042] The limiting member 121 is detachably connected to the rotor main body 11, that is, the connecting portion 1211 is detachably connected to the rotor main body 11. For example, matching connection holes are respectively provided between the connecting portion 1211 and the rotor main body 11, and the connecting portion 1211 and the rotor main body 11 can be connected and fixed by passing bolts or screws through the corresponding connection holes.

[0043] Both the elastic member 122 and the pressing member 123 are installed in the installation cavity 111. One end of the elastic member 122 is connected to the limiting surface, and the other end is connected to the pressing member 123. Specifically, the pressing member 123 includes a bottom plate and a limiting ring provided on the bottom plate. The elastic member 122 is specifically a spring. One end of the spring is connected to the limiting surface of the limiting portion 1212, which can be specifically welding, bonding, clamping, or abutting, etc. The other end of the spring is fixedly sleeved on the limiting ring.

[0044] The rolling member 124 is placed in the installation cavity 111 and abuts between the inner bottom wall of the installation cavity 111 and the bottom of the pressing member 123, so that during the process of inserting the end of the motor shaft 2 into the installation cavity 111, the rolling member 124 can be caught in the limiting groove 2211 to clamp the rotor main body 11 and the motor shaft 2.

[0045] Specifically, during the assembly process, that is, after the end of the motor shaft 2 is inserted into the installation cavity 111, the motor shaft 2 will push the rolling element 124 to move along the conical working surface. At this time, the rolling element 124 is abutted between the conical working surface, the end of the motor shaft 2, and the bottom of the pressing member 123. When the rolling element 124 moves upward along the conical working surface, the diameter of the conical working surface gradually increases upward, and the rolling element 124 expands outward under the pressure of the motor shaft 2, and the distance between the rolling elements 124 increases, so that the end of the motor shaft 2 can be smoothly inserted between the rolling elements 124. When the rolling element 124 moves up a certain distance, it moves downward under the pressure of the pressing member 123 and the spring, so that it is smoothly inserted into the limiting groove 2211 of the motor shaft 2, and the motor shaft 2 is fixed to the rotor body 11.

[0046] In this embodiment, the rolling member 124 is a round ball, and the rolling member 124 can be made of a metal material, for example, the rolling member 124 is a steel ball. The rolling member 124 made of metal has good strength and wear resistance, and is suitable for the assembly structure with the motor shaft 2. Moreover, the use of a steel ball as the rolling member 124 can withstand the huge load generated when the motor is running, thereby ensuring the stable operation of the mechanical system.

[0047] In addition, there are multiple rolling elements 124, for example, there can be 2, 3 or 4 rolling elements 124, and the specific number of rolling elements 124 can be designed according to actual needs. Multiple rolling elements 124 are arranged in the installation cavity 111 in a coplanar installation manner, so that the assembly can be balanced. Preferably, multiple rolling elements 124 are arranged in the installation cavity 111 at equal angles, such as by using slideways 1311 arranged at equal angles to constrain the positions of corresponding rolling elements 124. When the motor shaft 2 is installed, the motor shaft 2 is inserted into the gap formed by the multiple rolling elements 124, that is, the motor shaft 2 is in contact with all the rolling elements 124 at the same time, and when the assembly is completed, all the rolling elements 124 are stuck in the limit grooves 2211 of the motor shaft 2.

[0048] In this embodiment, the pressing member 123 is provided with a second through hole 1231 through which the motor shaft 2 passes, that is, the second through hole 1231 is provided on the bottom plate of the pressing member 123. The second through hole 1231 can not only provide a space for the motor shaft 2 to continue to extend beyond the rolling member 124, but can also be designed as a limit through hole that can be clamped and fixed with the motor shaft 2, so as to play a role in prompting that the motor shaft 2 has been installed in place.

[0049] Further, the rotor assembly 1 further includes an unlocking member 13. The unlocking member 13 includes a movable member 131 and a handle 132 connected to the movable member 131. The movable member 131 is movably installed in the installation cavity 111 and adapted to the conical working surface. The handle 132 extends outside the installation cavity 111 so that during the unlocking process, the movable member 131 can be driven by the handle 132 to disengage the rolling member 124 from the limiting groove 2211.

[0050] Pull the movable member 131 through the handle 132 to drive the pressing member 123 and the rolling member 124 to move upward until the rolling member 124 crosses the end of the motor shaft 2, that is, disengages from the limiting groove 2211 of the motor shaft 2. At this time, the clamping and fixing of the motor shaft 2 is no longer formed, and the loosening and separation of the rotor main body 11 from the motor shaft 2 can be realized. Among them, the handle 132 extends outside the installation cavity 111, enabling the operator to conveniently hold and pull it without entering the interior of the rotor main body 11. This design greatly simplifies the operation process and improves the disassembly efficiency.

[0051] In this embodiment, there are two handles 132, and the two handles 132 are symmetrically arranged on the movable member 131. This not only facilitates the unlocking operation by the staff, but also enables the movable member 131 to be evenly stressed during the unlocking process, avoiding damage or failure of the internal structure of the rotor assembly 1 due to uneven stress.

[0052] As Figures 3 to 7 shown, both the rolling member 124 and the pressing member 123 are arranged inside the movable member 131. The movable member 131 has a conical cylinder structure, and the outer peripheral surface of the conical cylinder structure is adapted to the conical working surface. A slideway 1311 for guiding the moving direction of the rolling member 124 is formed on the conical cylinder structure. The slideway 1311 can guide the rolling member 124 to move along a predetermined path. During the insertion and disassembly of the motor shaft 2, the rolling member 124 needs to expand and contract on the inner conical surface of the conical cylinder structure, and the slideway 1311 ensures the accuracy and stability of this movement.

[0053] Further, a slit 1215 for the handle 132 to pass through is constructed between the limiting portion 1212 and the connecting portion 1211 to restrict the circumferential rotation of the movable member 131 relative to the installation cavity 111 by means of the slit 1215. The setting of the slit 1215 not only provides a channel for the handle 132 to extend outside the installation cavity 111, but also can restrict the circumferential rotation of the movable member 131 relative to the installation cavity 111, that is, restrict the operator from pulling the handle 132 in a rotating manner, thereby indirectly guiding the operator to pull the handle 132 upward and ensuring its stability and accuracy during the operation process.

[0054] The connecting portion 1211 is configured with a first through hole 1214 corresponding to the mounting cavity 111, and the limiting portion 1212 is located above the first through hole 1214 and thus a slit 1215 is configured. Figure 6 and Figure 7 As shown, the connecting portion 1211 is a plate-like structure, the middle of the plate-like structure is penetrated to form a first through hole 1214, the limiting portion 1212 is located above the first through hole 1214, and the downward projection of the limiting portion 1212 can only block the middle part of the first through hole 1214, and the limiting portion 1212 does not block the first through hole 1214 at both sides, that is, the side plates on both sides of the limiting portion 1212 and the first through hole 1214 together form a slit 1215. The handle 132 includes an extension portion 1321 and a gripping portion 1322, the extension portion 1321 is vertically arranged, the gripping portion 1322 is horizontally arranged, the bottom end of the extension portion 1321 is connected to or integrally formed with the movable member 131, the top end of the extension portion 1321 passes through the slit 1215 and is connected to or integrally formed with one end of the gripping portion 1322, and the other end of the gripping portion 1322 extends in a direction away from the limiting portion 1212. The limiting member 121 may be composed of two detachably connected half structures, and the two half structures are fixedly connected by the anti-detachment portion 1213 .

[0055] It should be noted that the structure of the unlocking component 13 and the structure of the limiting component 121 in the above embodiment are merely exemplary, and the structure of the unlocking component 13 and the structure of the limiting component 121 are not limited thereto. Those skilled in the art can adjust the external structure of the unlocking component 13 and the limiting component 121 as needed, as long as they have the above functions.

[0056] like Figures 3 to 5 As shown, the rotor assembly 1 further includes a base 14, which is detachably connected to the bottom of the rotor body 11, and is provided with a third through hole 141 for the motor shaft 2 to pass through. The base 14 provides good support for the rotor body 11, ensuring the stability of the rotor body 11 during installation and use, and this support helps to reduce vibration and noise, and improve the operating efficiency of the motor.

[0057] See also Figure 1 and Figure 8 The present invention provides a motor, which includes a motor shaft 2 that can be adapted to the rotor assembly 1 in any of the above-mentioned technical solutions, and the motor shaft 2 is provided with a radially inwardly recessed limit groove 2211 near its end.

[0058] Specifically, Figure 8As shown, the motor shaft 2 includes a shaft body 21 and a fitting head 22. The fitting head 22 is arranged at the end of the shaft body 21. The fitting head 22 includes a clamping portion 221 and an insertion portion 222 that are connected in sequence along the direction away from the shaft body 21. A limiting groove 2211 is formed by the depression of the side wall of the clamping portion 221. The diameter of the cross-section of the insertion portion 222 gradually becomes smaller along the direction away from the clamping portion 221, that is, it has a conical structure. In addition, the fitting head 22 further includes a driving portion 223 adapted to the rotor main body 11. That is, the rotor main body 11 is provided with a driving hole 112 that communicates the installation cavity 111 with the outside, and the driving portion 223 is adapted to the driving hole 112. The cross-section of the driving portion 223 is non-circular. For example, the cross-section of the driving portion 223 is rectangular, spline-shaped or other polygons. The non-circular driving portion 223 can transmit torque more effectively. By inserting the non-circular driving portion 223 into the adapted driving hole 112, when the motor shaft 2 needs to drive the rotor main body 11 to rotate, the non-circular contact surface can provide greater friction, thereby ensuring the smooth transmission of torque.

[0059] Among them, the insertion portion 222 with a gradually decreasing diameter enables the motor shaft 2 to more easily pass through various obstacles formed during the installation process when inserted into the installation cavity 111 of the rotor assembly 1, reducing the assembly difficulty caused by size mismatch. During the assembly process, the rolling element 124 of the rotor assembly 1 needs to be adaptively assembled into the limiting groove 2211. This process is actually an automatic correction of the position of the motor shaft 2, which helps to reduce the assembly error, improve the assembly accuracy, and thus improve the overall performance of the motor. Therefore, the limiting groove 2211 not only serves as a key part for clamping and fixing the motor shaft 2 and the rotor assembly 1, but also facilitates the positioning and alignment between the motor shaft 2 and the rotor assembly 1.

[0060] In addition, the present invention also provides a centrifuge. In one embodiment, the centrifuge includes the rotor assembly 1 in any of the foregoing technical solutions.

[0061] In another embodiment, the centrifuge includes a motor that can be adapted to the rotor assembly 1 in any of the foregoing technical solutions.

[0062] In still another embodiment, the centrifuge includes the rotor assembly 1 in any of the foregoing technical solutions and a motor that can be adapted to the rotor assembly 1.

[0063] The installation process of the present invention:

[0064] During the assembly process, when the motor shaft 2 is inserted into the rotor body 11 through the through mounting cavity 111, the front end of the motor shaft 2 first contacts the rolling element 124 and is blocked. However, under the continuous action of an external force, the motor shaft 2 pushes the rolling element 124 and drives the pressing member 123 to move upward in the mounting cavity 111, while also compressing the elastic member 122. Also, due to the unique tapered working surface design of the mounting cavity 111, the rolling element 124 will expand outward while moving upward along the tapered working surface. When the rolling element 124 moves along the tapered working surface to a certain height, the restraint effect of the rolling element 124 on the motor shaft 2 is automatically released, and the motor shaft 2 can smoothly pass over the rolling element 124 and continue to extend. At this time, the elastic member 122 uses its inherent elastic restoring force to drive the rolling element 124 to move downward along the tapered working surface until the rolling element 124 is pushed into the limit groove 2211 of the motor shaft 2, thereby realizing the clamping and fixing of the motor shaft 2 and the rotor body 11.

[0065] Alternatively, when the rotor assembly 1 of the present invention further includes an unlocking member 13, the installation process is as follows:

[0066] During the assembly process, as Figure 3 shown, when the motor shaft 2 is inserted into the movable member 131 through the mounting hole, the front end of the motor shaft 2 first contacts the rolling element 124 and is blocked. As Figure 4 shown, however, under the continuous action of an external force, the motor shaft 2 pushes the rolling element 124 and drives the pressing member 123 and the movable member 131 to move upward in the mounting cavity 111, while also compressing the elastic member 122. Also, due to the internal tapered surface design of the movable member 131, the rolling element 124 will expand outward while moving upward along the internal tapered surface. As Figure 5 shown, when the rolling element 124 moves along the internal tapered surface to a certain height, the restraint effect of the rolling element 124 on the motor shaft 2 is automatically released, and the motor shaft 2 can smoothly pass over the rolling element 124 and continue to extend. At this time, the elastic member 122 uses its inherent elastic restoring force to drive the movable member 131 to move downward to the position where it abuts against the rotor body 11, and drives the rolling element 124 to move downward along the internal tapered surface of the movable member 131 until the rolling element 124 is pushed into the limit groove 2211 of the motor shaft 2, thereby realizing the clamping and fixing of the motor shaft 2 and the rotor body 11.

[0067] The disassembly process of the present invention:

[0068] When disassembling, by operating the handle 132, the movable member 131 can be pulled, thereby driving the pressing member 123 and the rolling member 124 to move upward together. When the rolling member 124 successfully crosses the end of the motor shaft 2, that is, when the rolling member 124 is successfully disengaged from the limiting groove 2211 on the motor shaft 2, it no longer forms a clamping and fixing effect on the motor shaft 2. At this time, the connection between the rotor main body 11 and the motor shaft 2 has been released, and the separation of the two can be easily achieved.

[0069] After the rolling member 124 of the present invention is pushed into the limiting groove 2211 of the motor shaft 2, the restoring force of the elastic member 122 enables the rolling member 124 to closely fit in the limiting groove 2211, thereby forming a firm clamping and fixing, ensuring the stable connection between the motor shaft 2 and the rotor main body 11, effectively preventing the loosening or falling off of the motor shaft 2 during operation, contributing to improving the overall reliability of the centrifuge, and reducing the failures caused by improper assembly or loose connection. No additional fixing tools are required for the entire installation process and disassembly process, which has the advantages of simple operation and convenient installation. In addition, the cooperation between the rolling member 124 and the elastic member 122 also has a certain shock absorption effect, which can, to a certain extent, protect the motor shaft 2 and the rotor main body 11 from the influence of external impacts.

[0070] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that, The motor shaft (2) adapted to the rotor assembly (1) is provided with a limiting groove (2211) recessed radially inward near its end. The rotor assembly (1) includes: A rotor main body (11) having a through mounting cavity (111) formed in the middle thereof, and the inner side wall of the mounting cavity (111) includes a conical working surface; and A locking member (12), which includes: A limiting member (121) connected to the rotor main body (11), and the limiting member (121) has a limiting surface facing the mounting cavity (111); A pressing member (123); An elastic member (122), which is installed in the mounting cavity (111) together with the pressing member (123). One end of the elastic member (122) is connected to the limiting surface, and the other end is connected to the pressing member (123); A rolling member (124) placed in the mounting cavity (111) and abutted between the inner wall of the mounting cavity (111) and the bottom of the pressing member (123), so that during the process of inserting the end of the motor shaft (2) into the mounting cavity (111), the rolling member (124) can be caught in the limiting groove (2211) to clamp the rotor main body (11) and the motor shaft (2).

2. The rotor assembly according to claim 1, wherein, The rotor assembly (1) further includes an unlocking member (13), and the unlocking member (13) includes a movable member (131) and a handle (132) connected to the movable member (131). The movable member (131) is movably installed in the mounting cavity (111) and is adapted to the conical working surface. The handle (132) extends outside the mounting cavity (111) so that during the unlocking process, the movable member (131) can drive the rolling member (124) to disengage from the limiting groove (2211) by means of the handle (132).

3. The rotor assembly according to claim 2, wherein, The movable member (131) includes a conical cylinder structure adapted to the conical working surface, and a slideway (1311) for guiding the moving direction of the rolling member (124) is formed on the conical cylinder structure.

4. The rotor assembly according to claim 2, characterized in that, The limiting member (121) includes a connecting portion (1211) and a limiting portion (1212), the limiting surface is formed on the limiting portion (1212), and the limiting portion (1212) is connected to the rotor main body (11) through the connecting portion (1211).

5. The rotor assembly according to claim 4, wherein, A slit (1215) for the handle (132) to pass through is formed between the limiting portion (1212) and the connecting portion (1211) to limit the circumferential rotation of the movable member (131) relative to the mounting cavity (111) by means of the slit (1215).

6. The rotor assembly according to claim 5, characterized in that, The connecting portion (1211) is provided with a first through hole (1214) corresponding to the mounting cavity (111), and the limiting portion (1212) is located above the first through hole (1214) and thus forms the slit (1215).

7. The rotor assembly according to any one of claims 1-6, characterized in that, There are multiple rolling members (124); and / or The pressing member (123) is provided with a second through hole (1231) for the motor shaft (2) to pass through; and / or The rotor assembly (1) further includes a bottom support (14), the bottom support (14) is detachably connected to the bottom of the rotor body (11), and the bottom support (14) is provided with a third through hole (141) for the motor shaft (2) to pass through.

8. A motor, characterized in that, The motor includes a motor shaft (2) that can be adapted to the rotor assembly (1) described in any one of claims 1-7, and a limiting groove (2211) that is recessed radially inward is provided at a position near the end of the motor shaft (2).

9. The motor according to claim 8, wherein The motor shaft (2) includes a shaft body (21) and a fitting head (22), and the fitting head (22) is arranged at the end of the shaft body (21); The fitting head (22) includes a clamping portion (221) and an insertion portion (222) that are sequentially connected in a direction away from the shaft body (21); a limiting groove (2211) is formed by the depression of the side wall of the clamping portion (221); the diameter of the cross-section of the insertion portion (222) gradually decreases in a direction away from the clamping portion (221); and / or The fitting head (22) includes a driving portion (223) adapted to the rotor body (11), and the cross-section of the driving portion (223) is non-circular.

10. A centrifuge, characterized in that, The centrifuge includes the rotor assembly (1) described in any one of claims 1-7; and / or The centrifuge includes the motor described in claim 8 or 9.

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