CN212328627U - Centrifugal machine - Google Patents

Abstract

A centrifuge, comprising: a rotor provided with a sample container and a motor driving the rotor to rotate and having a drive shaft, further comprising: the inner core is sleeved outside the driving shaft; the spring is sleeved on the outer side of the inner core; the outer core is sleeved outside the spring, and a first limiting part which extends inwards along the radial direction of the driving shaft is formed on the inner wall of the outer core and is contacted with the upper part of the spring; the sleeve is arranged outside the outer core and forms a cavity together with the inner core, and the outer core moves in the cavity along the axial direction of the driving shaft; and a second stopper portion formed between the first stopper portion and the drive shaft and moving in a radial direction of the drive shaft; in a release state, the outer core extrudes the spring under the action of external force, the first limiting part is separated from the second limiting part, and the second limiting part moves outwards; under the locking state, the outer core restores to the initial position under the restoring force action of the spring, the first limiting part extrudes the second limiting part, and the second limiting part extends into the limiting groove formed on the driving shaft. The utility model provides high rotor handling efficiency.

Description

Centrifugal machine

Technical Field

The utility model belongs to the technical field of centrifuge, especially, relate to a centrifuge.

Background

The centrifuge rotor is mounted on a centrifuge. Such centrifuges are used primarily in laboratories for research in the fields of medicine, pharmacy, biology, and chemistry to separate components of a sample using mass inertia. The rotor speed of the centrifuge needs to be kept at least 3000 rpm, which may reach 10000 rpm or even 15000 rpm under special requirements. The rotor is provided with sample containers in different ways, in which the samples to be centrifuged are stored and rotated. The rotor shaft is usually arranged vertically and is driven by an electric motor.

The most common prior art mounting of the rotor is by means of a screw thread to removably mount the rotor to the drive shaft of the motor so that the rotor and motor drive shaft are fixed together and rotate with the motor drive shaft. The fixing mode is relatively simple to process, for example, the scheme disclosed in the chinese patent application (publication No. CN 201510943U), "a centrifuge rotor fixing device" includes a sleeve 2 fixed in a mounting hole of a centrifuge rotor 1, and a tapered cartridge 3 installed between the sleeve 2 and a motor driving shaft 5, a screw 4 is installed at the top of the cartridge 3, the screw 4 is in threaded connection with the cartridge 3, the cartridge 3 is driven to move upwards when the screw 4 is screwed, and the cartridge 3 is shrunk and fastened on the motor driving shaft 5 under the limitation of the sleeve 2. "

This screw connection, although having the advantage of a simple and robust construction, also means that the screw connection needs to be removed when the rotor is replaced, the speed of replacement of the rotor is relatively slow and, if the collet 3 is provided, it is likely that additional tools will be required for the replacement.

Disclosure of Invention

The utility model discloses when adopting threaded connection rotor and motor drive shaft among the prior art, change the inefficiency of rotor, and probably need the supplementary problem of instrument, design and disclose a brand-new centrifuge.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

a centrifuge, comprising: a rotor on which at least one sample container for containing a sample to be centrifuged is arranged; a motor for driving the rotor to rotate, the motor having a drive shaft; further comprising: the inner core is sleeved outside the driving shaft; the spring is sleeved outside the inner core; the outer core is sleeved outside the spring, a first limiting part extending inwards along the radial direction of the driving shaft is formed on the inner wall of the outer core, and the first limiting part is contacted with the upper part of the spring; the sleeve is arranged on the outer side of the outer core, the sleeve and the inner core jointly enclose a cavity, and the outer core moves in the cavity along the axial direction of the driving shaft; and a second stopper portion formed between the first stopper portion and the drive shaft, the second stopper portion moving in a radial direction of the drive shaft; in the release state, the outer core extrudes the spring under the action of external force, the first limiting part is separated from the second limiting part, and the second limiting part moves outwards; under the locking state, the outer core restores to the initial position under the restoring force action of the spring, the first limiting part extrudes the second limiting part, and the second limiting part extends into the limiting groove formed on the driving shaft.

One preferred structure is that the first limiting part is a limiting boss; the second limiting part is a limiting steel ball, and the plurality of limiting steel balls are uniformly arranged around the driving shaft; the limiting groove is an annular clamping groove formed in the driving shaft.

In order to realize automatic reset, a plurality of steel ball holes are formed in the inner core, and the plurality of steel ball holes are arranged corresponding to the limiting steel balls; the steel ball hole is provided with a first opening formed on the outer wall of the inner core and a second opening formed on the inner wall of the inner core; the diameter of the first opening is smaller than or equal to that of the limiting steel ball, and the diameter of the second opening is smaller than that of the limiting steel ball.

In order to ensure the strength of the driving shaft and realize automatic locking, the length of the limiting steel ball extending into the annular clamping groove is less than or equal to one half of the diameter of the limiting steel ball.

The user preferably operates through a button which is arranged on the upper side of the outer core and is in contact with the outer core;

when the button is pressed, the button pushes the outer core to move the compression spring.

Preferably, the power is transmitted by the following structure, further comprising: a drive pin disposed on the drive shaft; and a driving groove formed on the inner core; the drive pin is located in the drive slot.

Further, the rotor includes: the rotor body is coaxially arranged with the driving shaft, and sample containers for containing samples to be centrifuged are uniformly distributed on the rotor body; the inner core, the rotor body and the sleeve are fixedly connected through bolts from bottom to top.

Further, the method also comprises the following steps: the handle is sleeved outside the sleeve.

Further, the method also comprises the following steps: the rotor cover is sleeved outside the handle, a third limiting portion is arranged on the handle, and the rotor cover is located between the third limiting portion and the sleeve.

To avoid erroneous operation, the upper surface of the button is flush with the upper surface of the handle.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

the utility model provides a centrifuge need not carry out external force intervention at whole in-process, gets the fixed connection of putting or removes the completion that all can be very fast, has greatly improved the efficiency that centrifuge rotor changed. Under the locking state, if no external force acts, the rotor and the driving shaft can not be separated, and the safety of the centrifugal process is further improved.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a cross-sectional view of a connection structure between a rotor and a motor in a locked state according to an embodiment of the present invention along an axial direction of a motor driving shaft;

fig. 2 is a cross-sectional view of a connection structure of a first limit portion and a second limit portion along a radial direction of a motor driving shaft in a locked state according to an embodiment of the present invention;

FIG. 3 is a schematic view of the construction of the drive shaft;

FIG. 4 is a schematic structural view of the inner core;

figure 5 is a schematic view of the engagement between the inner core and the drive pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Aiming at the problems that when the centrifugal machine in the prior art adopts a threaded connection rotor and a motor driving shaft, the efficiency of rotor replacement is low, and tools are possibly needed for assistance, a centrifugal machine with a brand-new design is shown in figure 1. Such centrifuges are also used primarily in laboratories for research in the medical, pharmaceutical, biological and chemical fields, for the inertial separation of components of a sample by centrifugal force and mass of the sample, or for other different experimental purposes. The core of the centrifuge is composed of a rotor and a motor. At least one sample container for receiving a sample to be centrifuged is arranged on the rotor. The sample container may be a test tube, a pipette, or other vessel or combination of vessels, and the shape, size, and material of the sample container are not limited herein. In a specific configuration, as shown in fig. 1, the rotor 1 may be composed of a rotor body 27 and a rotor cover 28, wherein the rotor body 27 is uniformly provided with a plurality of receiving locations 11, and each receiving location 11 may be provided with a sample container for receiving a sample to be centrifuged. The rotor body 27 is opened and closed or sealed by a rotor cover 28. The rotor cover 28 may further protect the sample container in the rotor body 27, reducing the risk of contamination of the sample, and also preventing accidental injury to the operator.

The motor is then used to drive the rotor 1 in rotation, the motor having a drive shaft 12 for transmitting power. As shown in fig. 1, the centrifuge provided in this embodiment further includes several key components, such as an inner core 13, a spring 14, an outer core 15, and a sleeve 16, where the inner core 13, the outer core 15, and the sleeve 16 are all designed to be hollow structures, the inner core 13 is sleeved on the outer side of the driving shaft 12, the spring 14 is sleeved on the outer side of the inner core 13, the outer core 15 is sleeved on the outer side of the spring 14, and the sleeve 16 is disposed on the outer side of the outer core 15. On the basis of the position of the driving shaft 12 of the motor, a first limiting portion 17 extending inward in the radial direction of the driving shaft 12 is formed on the inner wall of the outer core 15. The lower end surface of the first stopper 17 contacts the upper portion of the spring 14. The sleeve 16 and the inner core 13 together define an annular cavity in which the outer core 15 is movable in the axial direction of the drive shaft 12. A second stopper portion 19 is further provided between the first stopper portion 17 and the drive shaft 12, and the second stopper portion 19 is movable in the radial direction of the drive shaft 12. That is, when the outer core 15 moves in the axial direction of the drive shaft 12 in the cavity, the first stopper portion 17 and the second stopper portion 19 may be in both a contact pressing state and a non-contact releasing state. In the released state, the outer core 15 can press the spring 14 under the action of external force, the first limiting portion 17 and the second limiting portion 19 are separated, the second limiting portion 19 moves outwards, and the rotor 1 can be taken down from the driving shaft 12. And in the locked state, the outer core 15 is returned to the original position by the restoring force of the spring 14. The first limit portion 17 presses the second limit portion 19, the second limit portion 19 extends into a limit groove 18 formed in the drive, and the relative positions of the rotor 1 and the drive shaft 12 are fixed.

In combination with the use state of the centrifuge, when the rotor 1 and the motor are in a separated state and are not used, the spring 14 is in an uncompressed state, the first limiting part 17 and the second limiting part 19 are in contact with each other, and the second limiting part 19 extends out. If a user needs to mount the rotor 1 on the driving shaft 12, an external force is applied, the outer core 15 presses the spring 14 under the external force, and the first limiting portion 17 and the second limiting portion 19 are separated until the rotor 1 is mounted in place. The outer core 15 is not acted by external force any more, the outer core 15 restores to the initial position under the restoring force action of the spring 14, the first limiting part 17 extrudes the second limiting part 19, and the second limiting part 19 extends into the limiting groove 18 formed on the driving shaft 12, so that the locking of the first limiting part and the second limiting part is realized. After the use, if a user needs to replace the rotor 1, or the rotor 1 is taken down from the driving shaft 12, the external force is applied again, the outer core 15 extrudes the spring 14 under the action of the external force, the first limiting part 17 and the second limiting part 19 are separated, the second limiting part 19 moves outwards and exits from the limiting groove 18, the rotor 1 can be separated from the driving shaft 12, after the rotor 1 is separated from the driving shaft 12, the external force is removed, and the first limiting part 17 and the second limiting part 19 are restored to the initial state, so that the next installation can be completed. In the whole process, external force intervention is not needed, the fixed connection of taking and placing or the release can be completed quickly, and the replacement efficiency of the centrifuge rotor 1 is greatly improved. In the locked state, if no external force acts, the rotor 1 and the driving shaft 12 are not separated, and the safety of the centrifugal process is further improved.

Referring to fig. 2, a preferred structure of the first stopper portion 17, the second stopper portion 19, and the stopper groove 18 will be described below. As shown in the figure, the first position-limiting portion 17 is preferably an annular position-limiting boss formed on the inner wall of the outer core 15, the second position-limiting portion 19 is a position-limiting steel ball, a plurality of position-limiting steel balls are uniformly arranged around the driving shaft 12, and the position-limiting groove 18 is an annular groove formed on the driving shaft 12. In order to realize the automatic withdrawing of the second limiting part 19 from the limiting groove 18, a plurality of steel ball holes 20 are formed on the inner core 13, and the plurality of steel ball holes 20 correspond to the setting positions of the limiting steel balls. The ball hole 20 is designed in a half-through form, and as shown in fig. 2 and 4, the ball hole 20 has a first opening formed on the outer wall of the inner core 13 and a second opening formed on the inner wall of the inner core 13. The diameter of the first opening is smaller than or equal to the diameter of the limiting steel ball, preferably equal to the diameter of the limiting steel ball, and the diameter of the second opening is smaller than the diameter of the limiting steel ball. The length of the limiting steel ball extending into the annular clamping groove is less than or equal to one half of the diameter of the limiting steel ball, and preferably one third of the diameter of the limiting steel ball. In this way, the strength of the drive shaft 12 can be ensured, and a limit locking effect can be achieved.

The external force driving the outer core 15 to move in the cavity is preferably applied by the button 21. The button 21 is disposed on the upper side of the outer core 15 and contacts the outer core 15. When the push button 21 is pressed, the push button 21 pushes the outer core 15 to move the pressing spring 14. In order to avoid the button 21 from being erroneously touched by an external factor due to a collision, it is preferable to design the upper surface of the button 21 to be flush with the upper surface of the handle 25. The handle 25 is fitted over the outside of the sleeve 16, and the rotor cover 28 is fitted over the outside of the handle 25. The handle 25 is preferably provided with a third stop portion 26, the third stop portion 26 is an annular boss disposed on the outer wall of the handle 25 and extending radially outward along the drive shaft 12, and a portion of the rotor cover 28 is located between the third stop portion 26 and the sleeve 16. The rotor body 27 is coaxially disposed with the driving shaft 12, and the inner core 13, the rotor body 27 and the sleeve 16 are fixedly connected by bolts from bottom to top to form a whole. In order to ensure a stable connection during rotation, a plurality of threaded joints 24 are preferably provided, the plurality of threaded joints 24 being evenly distributed about the drive shaft 12.

The power transmission between the drive shaft 12 and the rotor 1 is preferably effected by means of the drive pin 22. The drive pin 22 is provided on the drive shaft 12. The bottom of the inner core 13 corresponding to the inner core is provided with a driving groove 23. When in the locked position, the drive pin 22 is located in the drive slot 23, transmitting the motor drive force to the rotor 1.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims (10)

1. A centrifuge, comprising:

a rotor having at least one sample container for containing a sample to be centrifuged disposed thereon;

a motor for driving the rotor to rotate, the motor having a drive shaft;

it is characterized by also comprising:

the inner core is sleeved outside the driving shaft;

the spring is sleeved outside the inner core;

the outer core is sleeved on the outer side of the spring, a first limiting part extending inwards along the radial direction of the driving shaft is formed on the inner wall of the outer core, and the first limiting part is in contact with the upper part of the spring;

the sleeve is arranged outside the outer core, the sleeve and the inner core jointly enclose a cavity, and the outer core moves in the cavity along the axial direction of the driving shaft; and

a second stopper portion formed between the first stopper portion and the drive shaft, the second stopper portion moving in a radial direction of the drive shaft; wherein

In a release state, the outer core extrudes the spring under the action of external force, the first limiting part and the second limiting part are separated, and the second limiting part moves outwards; in a locked state, the outer core returns to an initial position under the restoring force of the spring, the first limiting portion extrudes the second limiting portion, and the second limiting portion extends into a limiting groove formed in the driving shaft.

2. The centrifuge of claim 1, wherein:

the first limiting part is a limiting boss;

the second limiting part is a limiting steel ball, and the limiting steel balls are uniformly arranged around the driving shaft;

the limiting groove is an annular clamping groove formed in the driving shaft.

3. The centrifuge of claim 2, wherein:

a plurality of steel ball holes are formed in the inner core and correspond to the limiting steel balls;

the steel ball hole is provided with a first opening formed on the outer wall of the inner core and a second opening formed on the inner wall of the inner core; the diameter of the first opening is smaller than or equal to that of the limiting steel ball, and the diameter of the second opening is smaller than that of the limiting steel ball.

4. The centrifuge of claim 3, wherein:

the length of the limiting steel ball extending into the annular clamping groove is less than or equal to one half of the diameter of the limiting steel ball.

5. The centrifuge of any of claims 1 to 4, wherein:

further comprising:

a button disposed at an upper side of the outer core and contacting the outer core;

when the button is pressed, the button pushes the outer core to move to press the spring.

6. The centrifuge of claim 5, wherein:

further comprising:

a drive pin disposed on the drive shaft; and

a drive slot formed on the inner core;

the drive pin is located in the drive slot.

7. The centrifuge of claim 6, wherein:

the rotor includes:

the rotor body is coaxially arranged with the driving shaft and is used for uniformly distributing sample containers for accommodating samples to be centrifuged on the rotor body;

the inner core, the rotor body and the sleeve are fixedly connected through bolts from bottom to top.

8. The centrifuge of claim 7, wherein:

further comprising:

the handle is sleeved outside the sleeve.

9. The centrifuge of claim 8, wherein:

further comprising:

a rotor cover, the rotor cover is sleeved outside the handle,

the handle is provided with a third limiting part, and the rotor cover is partially positioned between the third limiting part and the sleeve.

10. The centrifuge of claim 9, wherein:

the upper surface of the button is flush with the upper surface of the handle.

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