A swing-out rotor for a centrifuge

Abstract

The present invention discloses a swing-flat rotor for a centrifuge, comprising a swing-flat rotor body and a hanging basket installed on the swing-flat rotor body; the swing-flat rotor body is a hollow annular structure, and the inner cavity of the swing-flat rotor body is provided with a hollow connecting ring; an annular groove is provided on the hollow connecting ring, and the cross section of the annular groove is an inclined U-shape; the hollow connecting ring is provided with a plurality of rectangular grooves along its radial direction, and the plurality of rectangular grooves are arranged in an annular shape, and the rectangular grooves are connected with the annular grooves, and the rectangular grooves are connected with the inner cavity of the swing-flat rotor body; both sides of the opening end of the hanging basket are provided with truncated cone-shaped protrusions matching with the annular grooves, and the truncated cone-shaped protrusions on both sides of the hanging basket are stuck in the annular grooves and are located at the bottom of the grooves. When the present invention is centrifuged at high speed, the hanging basket is automatically stored in the swing-flat rotor body, and a nearly complete round pancake-shaped rotating body is synthesized, which has small wind resistance and is smaller in volume than a conventional swing-flat rotor of the same centrifugal capacity, greatly reducing wind resistance, reducing the working energy consumption of the centrifuge, and being able to operate at high speed.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory centrifuge devices, and more particularly to a swing-out rotor for a centrifuge. Background Art

[0002] The centrifuge is provided with a rotor and a driving component for driving the rotor to rotate in a centrifugal chamber. The driving component rotates the rotor in the centrifugal chamber to exert centrifugal force, thereby centrifugally separating the sample in the sample container. The rotor used for the centrifuge can be roughly divided into an angle rotor and a swing-out rotor. In the case of an angle rotor, a plurality of sample containers filled with samples are accommodated in a receiving hole, and the receiving hole is formed in a manner having a certain angle relative to the drive shaft, and the relative angle between the receiving hole and the drive shaft is always fixed regardless of the size of the centrifugal force. In addition, a rotor cover is often installed in the opening on the upper part of the rotor, and the rotor cover is installed to reduce wind loss.

[0003] In contrast, the swing-out rotor uses a swingable hanging basket, in which a test tube or sample container filled with a sample is loaded. On the side of the hanging basket, there is a concave portion that engages with the convex cylindrical surface (hook pin) of the swing-out rotor body face to face, and the concave portion and the convex cylindrical surface are slidably engaged.

[0004] When the rotor is stationary, the center line of the basket is parallel to the drive shaft (θ=0°), but as the rotation speed increases, centrifugal force acts on the swingably mounted basket, causing it to rotate around the hanging pin (θ>0°). At a rotation speed that generates centrifugal force that makes the basket horizontal, it becomes roughly horizontal (θ≈90°). If the centrifugal separation operation is completed and the rotation speed decreases, the swing angle θ gradually decreases, and when it stops, it becomes θ≈0°.

[0005] Thus, the relative angle between the center line of the basket of the swing-off rotor and the drive shaft changes according to the magnitude of the centrifugal force during the rotation. There are two types of swing-off rotors: one in which the rotor body and the basket are rotated in an exposed state in the centrifugal chamber, and the other in which the rotor body and the entire basket are covered with a windshield and a cover and then the whole is placed on the drive shaft for rotation.

[0006] When a swing rotor is centrifugally operated in the atmosphere, in the case of a rotor with a large rotation radius or a high rotation speed, if it is rotated in an exposed state, the wind pressure or friction resistance increases and the rotor body or the hanging basket heats up, or the rotation speed does not increase from a certain point. Therefore, in the case of a large swing rotor or a swing rotor that rotates at a high speed, a wind shield and a cover are mostly used. In such a swing rotor structure, high-speed centrifugal separation is achieved by reducing wind loss, so those skilled in the art have tried to add a wind shield to reduce wind loss.

[0007] For example, the existing patent documents: ZL 201821707785.6 A closed cover and lid are added to a high-speed swing-flat rotor for a centrifuge. ZL 201921056307.8 A closed wind hood and wind hood cover are added to a high-speed centrifuge horizontal rotor.

[0008] From the separation effect point of view, in the case of an angle rotor, the center line of the test tube in the angle rotor forms a fixed angle with the drive shaft. The larger the angle, the better the separation effect. The angle rotor has a low center of gravity, small resistance, and smooth operation. It is often used for high-speed centrifugal separation. However, when the particles settle, the particles will first hit the test tube in the direction of the centrifugal force, and then slide to the bottom of the tube along the tube wall. A wall effect caused by particle deposition will appear on one side of the test tube, affecting the separation effect.

[0009] In contrast, when using a swing-out rotor for centrifugal separation, the angle between the test tube and the drive shaft is close to vertical, and the particles directly settle to the bottom of the test tube, which is conducive to the separation of particles and solution. However, a swing-out rotor without a windshield and a cover cannot achieve high-speed rotation; and a swing-out rotor equipped with a windshield and a cover is not convenient for the robot of the automated centrifuge to take and place the test tube.

[0010] The rapidly developing intelligent and automated centrifuge units are limited by the system space. Most of them use manipulators to take and place the test tubes containing samples from the small door hole of the centrifuge cover. After stopping the operation, the positioning accuracy of the test tubes is high, the vertical inclination of the test tubes is required to be ≯±2°, and they cannot be covered. Angle rotors with covers and swing-flat rotors with wind shields are obviously not applicable.

[0011] Therefore, how to provide a swing-out rotor for a centrifuge that can facilitate a robot arm to grab a test tube is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0012] In view of this, the present invention provides a swing-off rotor for a centrifuge to at least solve one of the problems raised in the above background technology section.

[0013] In order to realize the above scheme, the present invention adopts the following technical scheme:

[0014] A swing-flat rotor for a centrifuge comprises a swing-flat rotor body and a hanging basket mounted on the swing-flat rotor body; the swing-flat rotor body is a hollow annular structure, the inner cavity of the swing-flat rotor body is provided with a hollow connecting ring, the inner circle of the hollow connecting ring is connected with a shaft sleeve, and is mounted on a driving shaft of a driving component through the shaft sleeve;

[0015] The hollow connecting ring is provided with an annular groove, and the cross-section of the annular groove is an inclined U-shape; the hollow connecting ring is provided with a plurality of rectangular grooves along its radial direction, and the plurality of rectangular grooves are arranged in an annular shape, and the rectangular grooves are connected with the annular groove, and the annular groove is divided into multiple sections, and the rectangular grooves are connected with the inner cavity of the swing-off rotor body; frustum-shaped protrusions matching the annular groove are arranged on both sides of the opening end of the hanging basket, and the frustum-shaped protrusions on both sides of the hanging basket are stuck in the annular groove and are located at the bottom of the groove; the hanging basket can swing in the rectangular groove under the cooperation of the frustum-shaped protrusions and the annular groove; a bottom plate opening for the entry and exit of the hanging basket is provided at the bottom of the swing-off rotor body corresponding to the hanging basket.

[0016] The present invention solves the above problems and provides a rotor capable of running at high speed (≮10000r / min). After stopping running, the vertical inclination of the test tube is ≯±2°, and the rotor is thrown flat and not covered, so that the robot can grasp it accurately.

[0017] The swing-off rotor provided by the present invention can fully ensure the contact of the swinging surface between the truncated cone-shaped protrusion and the annular surface of the groove bottom of the annular groove, and optimize the taper size of the truncated cone-shaped protrusion and the annular surface of the annular groove bottom of the segmented swing-off rotor body.

[0018] Preferably, in the above-mentioned swing-off rotor for centrifuge, the angle between the annular groove and the horizontal plane is β, and the angle β is less than 90°. The angle β facilitates processing and prevents the hanging basket from naturally falling out.

[0019] Preferably, in the above-mentioned swing-off rotor for centrifuge, there is a clearance fit between the side surface of the hanging basket and the rectangular groove.

[0020] Preferably, in the above-mentioned swing-off rotor for centrifuge, an outer peripheral opening is opened at the outer periphery of the swing-off rotor body, and a tail protrusion capable of sealing and flushing the outer peripheral opening is provided at the tail of the hanging basket.

[0021] Preferably, in the above-mentioned swing-off rotor for centrifuge, when the hanging basket is swung into a horizontal state, the bottom surface of the hanging basket can seal and flush with the bottom plate opening at the bottom of the swing-off rotor body.

[0022] Another object of the present invention is that when the hanging basket is erected, the center of gravity is slightly biased to the side of the center line of the truncated cone-shaped protrusion of the hanging basket (swing axis) close to the drive shaft, so that when running at high speed, the swing of the hanging basket tends to cross the vertical angle between the test tube and the drive shaft (swing angle θ>90°). Due to the restriction of the tail protrusion provided at the tail of the hanging basket, the tail protrusion is located in the outer peripheral opening and remains vertical (swing angle θ=90°); similarly, when the provided hanging basket is erected, the center of gravity is away from the center line of the truncated cone-shaped protrusion (swing axis) below, close to the side of the tail of the hanging basket. After stopping operation, the hanging basket is affected by gravity and automatically returns to the upright state (swing angle θ=0°).

[0023] Preferably, in the above-mentioned swing-flat rotor for a centrifuge, the outer peripheral opening includes a side opening and a chamfered arc surface opening corresponding to and penetrating the bottom plate opening, the side opening is opened at the bottom of the side surface of the swing-flat rotor body; the chamfered arc surface opening is opened on the chamfered arc surface at the bottom of the side surface of the swing-flat rotor body;

[0024] The tail protrusion includes a tail surface, a tail outer circumferential surface and a tail chamfered arc surface; when the hanging basket is in a horizontal state, the tail surface can fit with the upper edge of the side opening, the tail outer circumferential surface can seal the side opening flush, and the tail chamfered arc surface can seal the chamfered arc surface opening flush.

[0025] The rectangular groove has upper and lower through parts for the hanging basket to pass through when it is statically upright (the test tube is parallel to the driving shaft, and the swing angle θ=0°), and the non-through parts of the rectangular groove still retain the original continuous annular characteristics of the swing-off rotor body.

[0026] During high-speed centrifugation, the hanging basket is swung to a horizontal state (the test tube is perpendicular to the drive shaft, and the swing angle θ=90°), and is accommodated in the rectangular groove and the swing-flat rotor body. The tail surface can fit with the upper edge of the side opening, the outer circumferential surface of the tail can seal the side opening flush, the chamfered arc surface of the tail can seal the chamfered arc surface opening flush, and the bottom surface of the hanging basket can seal the bottom plate opening at the bottom of the swing-flat rotor body flush, together forming a round pancake-shaped rotating body with a nearly complete lower plane and outer circumferential surface and no protruding parts on the upper plane.

[0027] Preferably, in the above-mentioned swing-out rotor for a centrifuge, the hanging basket is in the shape of a rectangular parallelepiped, and a receiving compartment for accommodating test tubes is provided in the hanging basket.

[0028] Preferably, in the above-mentioned swing-off rotor for centrifuge, the inner cavity of the hollow connecting ring is connected to the swing-off rotor body, the top surface of the hollow connecting ring is lower than the top surface of the swing-off rotor body, and the rectangular groove passes through the top of the hollow connecting ring to separate the hollow connecting ring into a plurality of connecting arms.

[0029] It can be seen from the above technical scheme that, compared with the prior art, the present invention discloses a swing-flat rotor for a centrifuge, wherein the swing-flat rotor body is a hollow annular structure, and the combined hanging basket is swing-flat to form a round cake-shaped structure, and the hanging basket is suspended in a rectangular groove, and a test tube filled with a sample is placed in the hanging basket for centrifugal separation, and the swing-flat rotor only requires two parts to be combined, and the structure is simple.

[0030] When the swing-off rotor of the present invention is stationary, the hanging basket slides down along the annular surface at the bottom of the annular groove under the action of gravity and automatically restores to an upright state, meeting the requirement that the vertical inclination of the test tube is ≯±2°. Compared with the conventional swing-off rotor in the prior art in which the cylindrical surface (hanging pin) of the convex part of the swing-off rotor body is engaged with the concave part of the hanging basket, the hanging basket needs to overcome the friction resistance of the concave part of the hanging basket rotating upward to the upper part of the hanging pin to automatically restore to an upright state under the action of gravity, which is difficult to meet the requirement that the vertical inclination of the test tube is ≯±2°.

[0031] When the swing-off rotor of the present invention is centrifuged at high speed, the hanging basket is automatically stored in the swing-off rotor body to form a nearly complete round pancake-shaped rotating body with small wind resistance and smaller volume than a conventional swing-off rotor of the same specification and centrifugal capacity, thereby greatly reducing wind resistance and the working energy consumption of the centrifuge and being able to operate at high speed (≮10000r / min). BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of a part of the present invention in a static state.

[0034] Figure 2 It is a schematic diagram of the present invention in which the hanging basket is in a swing-away state during the rotation and speed-up process.

[0035] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the present invention when the hanging basket is swung to a horizontal state (the test tube is perpendicular to the driving shaft, and the swing angle θ=90°) during high-speed rotation. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Combined with Figure 1-3 The embodiment of the present invention discloses a swing rotor for a centrifuge, comprising a swing rotor body 1 and a hanging basket 2 installed on the swing rotor body 1; the swing rotor body 1 is a hollow annular structure, a hollow connecting ring 3 is provided at the inner upper end of the swing rotor body 1, a shaft sleeve 4 is provided at the lower end of the swing rotor body 1, the inner circle of the hollow connecting ring 3 is connected to the shaft sleeve 4, and is installed on the driving shaft of the driving component through the shaft sleeve 4;

[0038] An annular groove 5 is provided on the hollow connecting ring 3, and the cross section of the annular groove 5 is an inclined U-shape; a plurality of rectangular grooves 6 are provided along the radial direction of the hollow connecting ring 3, and the plurality of rectangular grooves 6 are arranged in an annular shape, and the rectangular groove 6 penetrates the upper bottom surface and the lower bottom surface of the hollow connecting ring 3, and the rectangular groove 6 is connected with the annular groove 5, and the annular groove 5 is divided into multiple sections, and the rectangular groove 6 is connected with the inner cavity of the swing-flat rotor body 1; both sides of the opening end of the hanging basket 2 are provided with truncated cone-shaped protrusions 16 matching the annular groove 5, and the truncated cone-shaped protrusions 16 on both sides of the hanging basket 2 are stuck in the annular groove 5 and are located at the bottom of the groove; the hanging basket 2 can swing in the rectangular groove 6 under the cooperation of the truncated cone-shaped protrusions 16 and the annular groove 5; a bottom plate opening for the hanging basket 2 to swing in and out is provided at the bottom of the swing-flat rotor body 1 corresponding to the hanging basket 2;

[0039] The present invention solves the above problems and provides a rotor capable of running at high speed (≮10000r / min). After stopping running, the test tube 9 stands with an inclination of ≯±2° and the rotor is flattened and not covered, so that the robot can grasp it accurately.

[0040] The swing-off rotor provided by the present invention can fully ensure the contact between the swinging surfaces of the truncated cone-shaped protrusion 16 and the annular surface of the bottom of the annular groove 5, and optimize the taper size of the truncated cone-shaped protrusion 16 and the annular surface of the bottom of the segmented annular groove 5 of the swing-off rotor body 1.

[0041] In order to further optimize the above technical solution, the angle between the annular groove 5 and the horizontal plane is β, and the angle β is between 30-60°. The angle β facilitates processing and prevents the hanging basket 2 from naturally falling out.

[0042] In order to further optimize the above technical solution, a clearance fit is provided between the side surface of the hanging basket 2 and the rectangular groove 6 to ensure that the hanging basket 2 can complete the swinging.

[0043] In order to further optimize the above technical solution, an outer circumference opening 7 is opened on the outer circumference 13 of the swing-flat rotor body 1, and a tail protrusion 8 capable of sealing the outer circumference opening 7 is provided at the tail of the hanging basket 2.

[0044] Another object of the present invention is that when the hanging basket 2 is erected, the center of gravity is slightly biased to the side of the center line (swing axis) of the truncated cone-shaped protrusion 16 of the hanging basket 2 close to the drive shaft, so that when running at high speed, the hanging basket 2 swings and tends to cross the vertical angle between the test tube 9 and the drive shaft (swing angle θ>90°). Due to the restriction of the tail protrusion 8 provided at the tail of the hanging basket 2, the tail protrusion 8 is located in the outer peripheral opening 7 and remains vertical (swing angle θ=90°); similarly, when the provided hanging basket 2 is erected, the center of gravity is away from the center line (swing axis) of the truncated cone-shaped protrusion 16 and close to the side of the tail of the hanging basket 2. After stopping the operation, the hanging basket 2 is affected by gravity and the hanging basket 2 automatically returns to the upright state (swing angle θ=0°).

[0045] In order to further optimize the above technical solution, the outer peripheral opening 7 includes a side opening 71 and a chamfered arc surface opening 72 corresponding to and penetrating the opening of the bottom plate 10. The side opening 71 is opened at the bottom of the side of the swing-flat rotor body 1; the chamfered arc surface opening 72 is opened on the chamfered arc surface at the bottom of the side of the swing-flat rotor body 1;

[0046] The tail protrusion 8 includes a tail surface 81, a tail outer circumferential surface 82 and a tail chamfered arc surface 83; when the hanging basket 2 is in a horizontal state, the tail surface 81 can fit with the upper edge of the side opening 71, the tail outer circumferential surface 82 can seal the side opening 71 flush, and the tail chamfered arc surface 83 can seal the chamfered arc surface opening 72 flush.

[0047] The rectangular groove 6 has upper and lower through parts for the hanging basket 2 to pass through when it is stationary and upright (the test tube 9 is parallel to the drive shaft, and the swing angle θ=0°), so that the head and tail of the hanging basket 2 can extend out at the place where the rectangular groove 6 passes through the hollow connecting ring 3 and be in an upright state; the part where the rectangular groove 6 is not penetrated still retains the original continuous annular feature of the swing-off rotor body 1.

[0048] During high-speed centrifugation, the hanging basket 2 is thrown to a horizontal state (the test tube 9 is perpendicular to the drive shaft, and the swing angle θ=90°), and is accommodated in the rectangular groove 6 and the swing-flat rotor body 1. The tail surface 81 can fit with the upper edge of the side opening 71, the tail outer circumferential surface 82 can seal the side opening 71 flush, and the tail chamfered arc surface 83 can seal the chamfered arc surface opening 72 flush. At this time, the top surface 15 of the hanging basket 2 is exposed at the place where the hollow connecting ring 3 is penetrated by the rectangular groove 6, and the top surface 15 of the hanging basket 2 is flush with the top surface of the hollow connecting ring 3. At this time, the top surface 15 of the hanging basket 2 fits inside the top surface 12 of the swing-flat rotor body 1, and the bottom surface 14 of the hanging basket 2 is flush with the bottom plate 10 at the bottom of the swing-flat rotor body 1, together forming a round pancake-shaped rotating body with a lower plane and an outer circumferential surface that are approximately complete and no protruding parts on the upper plane.

[0049] In order to further optimize the above technical solution, the hanging basket 2 is in a rectangular shape, and a receiving compartment for accommodating the test tube 9 is provided in the hanging basket 2 .

[0050] In order to further optimize the above technical solution, the inner cavity of the hollow connecting ring 3 is connected to the swing-off rotor body 1, the top surface of the hollow connecting ring 3 is lower than the top surface of the swing-off rotor body 1, and the rectangular groove 6 passes through the top of the hollow connecting ring 3, dividing the hollow connecting ring 3 into a plurality of connecting arms 11.

[0051] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A swing-off rotor for a centrifuge, characterized in that: It comprises a swing-flat rotor body and a hanging basket installed on the swing-flat rotor body; the swing-flat rotor body is a hollow annular structure, the inner cavity of the swing-flat rotor body is provided with a hollow connecting ring, and the inner circle of the hollow connecting ring is connected with a shaft sleeve; The hollow connecting ring is provided with an annular groove, and the cross section of the annular groove is an inclined U-shape; the hollow connecting ring is provided with a plurality of rectangular grooves along its radial direction, and the plurality of rectangular grooves are arranged in an annular shape, and the rectangular grooves are connected with the annular grooves, and the rectangular grooves are connected with the inner cavity of the swing-flat rotor body; the opening end of the hanging basket is provided with truncated cone-shaped protrusions matching the annular grooves on both sides of the hanging basket, and the truncated cone-shaped protrusions on both sides of the hanging basket are stuck in the annular groove and are located at the bottom of the groove; the hanging basket can swing in the rectangular groove under the cooperation of the truncated cone-shaped protrusions and the annular groove; the bottom of the swing-flat rotor body corresponding to the hanging basket is provided with a bottom plate opening for the hanging basket to enter and exit; The outer periphery of the swing-flat rotor body is provided with an outer peripheral opening, and the tail of the hanging basket is provided with a tail protrusion capable of sealing the outer peripheral opening flush; the outer peripheral opening includes a side opening and a chamfered arc surface opening corresponding to and penetrating the bottom plate opening, and the side opening is opened at the bottom of the side surface of the swing-flat rotor body; the chamfered arc surface opening is opened on the chamfered arc surface at the bottom of the side surface of the swing-flat rotor body; the tail protrusion includes a tail surface, a tail outer circumferential surface and a tail chamfered arc surface; when the hanging basket is in a horizontal state, the tail surface can fit with the upper edge of the side opening, the tail outer circumferential surface can seal the side opening flush, the tail chamfered arc surface can seal the chamfered arc surface opening flush, and the bottom surface of the hanging basket can seal the bottom plate opening flush; There is a clearance fit between the side surface of the hanging basket and the rectangular groove.

2. The swing-off rotor for a centrifuge according to claim 1, characterized in that: The hanging basket is in a rectangular shape, and a receiving compartment for accommodating test tubes is arranged in the hanging basket.

3. The swing-off rotor for a centrifuge according to claim 1, characterized in that: The inner cavity of the hollow connecting ring is connected to the swing-off rotor body, the top surface of the hollow connecting ring is lower than the top surface of the swing-off rotor body, and the rectangular groove passes through the top of the hollow connecting ring to separate the hollow connecting ring into a plurality of connecting arms.

4. The swing-off rotor for a centrifuge according to claim 1, characterized in that: The angle between the annular groove and the horizontal plane is β, β<90°.

Images