WO2011001729A1

WO2011001729A1 - Centrifugal separator, rotor for centrifugal separator

Info

Publication number: WO2011001729A1
Application number: PCT/JP2010/056380
Authority: WO
Inventors: 敏春橋本
Original assignee: 株式会社久保田製作所
Priority date: 2009-06-30
Filing date: 2010-04-08
Publication date: 2011-01-06
Also published as: CN102292161B; CN102292161A; KR101214104B1; JP2011011118A; JP5442337B2; KR20110091793A

Abstract

The disclosed centrifugal separator attains both a simple attachment/detachment and a reliable fixing of a rotor to a rotating head. The disclosed rotor for a centrifugal separator is provided with male members and a rotor hole in which the rotating head is inserted. Each of the male members is rotatable around a rotating axle disposed horizontally within the rotor hole, has a center of gravity below the rotating axles, and has a protrusion on the opposite side of a rotating shaft that is below the center of gravity. The upper portion of the rotating head is a cylinder centered on the axle center of the rotating shaft, and is provided with a rotor connector, which has an annular concavity on the inner surface. When the rotor is disposed on the rotating head while the rotating shaft is in a stopped state, the male members are inside the rotor connector, and the protrusions of the male members are facing the concavity of the rotor connector. When the rotating shaft rotates, the protrusions can move to lock into the concavity. Also, force is applied to the protrusions in the direction of locking into the concavity when force is applied that would separate the rotor from the rotating head while the protrusion is locked into the concavity.

Description

Centrifuge, centrifuge rotor

The present invention relates to a centrifuge having a rotary head attached to an upper part of a rotary shaft whose axis is in a vertical direction and a rotor disposed on the upper part of the rotary head. In particular, the present invention relates to a method for attaching and detaching a rotor and a rotary head and a fixing method.

The centrifuge consists of a rotating shaft whose axis is vertical, a motor for rotating the rotating shaft, a rotating head attached to the top of the rotating shaft, a rotor for containing a sample, a lid covering the top of the rotor, the whole It is composed of a casing that covers The rotor can be attached to and detached from the rotating shaft. The most common method of attaching and detaching is screwing, but a centrifugal separator that utilizes the centrifugal force generated when the rotating shaft, rotating head, and rotor rotate so that the rotor does not come off the rotating head during rotation. There is also. Specifically, there are Patent Document 1, Patent Document 2, Patent Document 3, and the like.

Japanese Utility Model Publication No. 42-18399 Japanese Patent No. 4239119 Japanese Patent No. 3861476

The centrifuges of Patent Document 1, Patent Document 2, and Patent Document 3 utilize the fact that any member moves outward by centrifugal force so that the rotor does not come off the rotating head during rotation. However, the force generated by the rotation is not only centrifugal force, but also lift force at high speed rotation. In particular, if it is rotated without a lid, if it is rotated without stopping the lid securely, or if it is rotated with a large imbalance, it is not intended to use it, There is an accident in which an unexpected force for separating the rotor (lifting force generated by rotation of the rotor, vibration and the like lifting the rotor) is generated, and the rotor is detached. That is, in consideration of the possibility of erroneous operation, the structure using only the centrifugal force as in Patent Document 1, Patent Document 2, and Patent Document 3 cannot secure sufficient safety when rotating at high speed.

The present invention has been made in view of such a situation, and in the centrifuge, both simple attachment and detachment of the rotor and the rotating head and reliable fixing of the rotor and the rotating head in consideration of the force for separating the rotor are performed. It aims to be realized.

The centrifuge of the present invention includes a rotating head attached to the upper part of a rotating shaft whose axis is in the vertical direction, and a rotor disposed on the upper part of the rotating head. The rotor includes a rotor hole into which the rotary head is inserted and a male member. The male member is rotatable about a rotation shaft disposed horizontally inside the rotor hole, has a center of gravity below the rotation shaft, and has a convex portion on the opposite side of the rotation shaft below the center of gravity. The rotary head has a cylindrical shape centered on the axis of the rotary shaft at the top, and a rotor coupling portion having an annular recess on the inner surface. When the rotor is disposed on the rotating head with the rotating shaft stopped, the male member is inside the rotor coupling portion, and the convex portion of the male member faces the concave portion of the rotor coupling portion. is doing. When the rotating shaft rotates, the convex portion moves so as to fit into the concave portion. In addition, when a force that separates the rotor from the rotary head is applied when the convex portion is fitted in the concave portion, a force is applied to the convex portion in a direction of fitting into the concave portion. For example, the normal line of the upper surface of the recess, which is the upper surface of the recess, is formed so as to pass through a position closer to the axial center than the center of the rotation axis. In other words, the normal of the surface where the upper surface of the convex part (convex part contact surface) and the upper surface of the concave part come into contact with each other when the detachment force acts on the rotor is lifted upward. A rotating shaft is arranged so as to pass through a close position.

According to the centrifuge of the present invention, it is not necessary to stop the screw when attaching the rotor to the rotary head. Also, it is not necessary to remove the screws when removing the rotor from the rotary head. Furthermore, even when a force that causes a rotor that is not assumed during rotation to be detached from the rotary head is applied, the convex portion and the concave portion are not separated. Therefore, both simple attachment and detachment and reliable fixing can be realized.

Sectional drawing which shows the structure inside the centrifuge of this invention. Sectional drawing which expanded the flame | frame of the rotor, the part of the male-type member, and the part of the rotation head. FIG. 3A is a plan view of the frame as viewed from above. 3B is a cross-sectional view taken along line AA in FIG. 3A. FIG. 3C is a side view when viewed from the direction B of FIG. 3A. Sectional drawing which shows the relationship between the male type | mold member and rotating head when rotating. FIG. 5A is a diagram showing a relationship of forces when the concave upper surface 11 is horizontal. FIG. 5B is a diagram showing a relationship of forces when the normal drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position farther from the axis 9 than the center 33-1 of the rotation axis. FIG. 5C shows a case where the normal drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotating shaft, and no separation force is generated. The figure which shows the relationship of force when. FIG. 5D shows a case where the normal drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotation axis, and a separation force is generated. The figure which shows the relationship of force when. Sectional drawing which expanded the flame | frame of the rotor of the modification 1, the part of a male-type member, and the part of a rotation head. The cross-sectional perspective view which expanded the flame | frame of the rotor of the modification 1, the part of a male-type member, and the part of a rotating head. Sectional drawing which expanded the flame | frame of the rotor of the modification 2 in the state which the rotation shaft stopped, the part of the male member, and the part of the rotation head. FIG. 9A is a side view of the frame 21 of Modification 2 as viewed from the C side in FIG. 8. FIG. 9B is a side view of the frame 21 of Modification 2 as viewed from the D side in FIG. 8. FIG. 10A is an enlarged cross-sectional view of a rotor frame, a male member portion, and a rotary head portion according to Modification 2; FIG. 10B is a diagram showing a force applied to the second male member 40. FIG. 10C is a diagram showing a force applied to the male member 23-1. Sectional drawing which expanded the flame | frame of the rotor of the state where a male member does not return to the inner side of a rotor coupling | bond part, a male member part, and the rotary head part even if a rotating shaft stops. Sectional drawing which expanded the flame | frame of the rotor of the state which returned the male member inside the rotor coupling | bonding part, the part of a male member, and the part of a rotating head. Sectional drawing which expanded the flame | frame of the rotor of the modification 4, the male member, the part of a guide pin, and the part of a rotation head. The top view which looked at the rotary head of the modification 4 from the upper side. FIG. 15A is an enlarged side view of a frame, a male member, and a guide pin of Modification 4. FIG. 15B is an enlarged bottom view of the frame, the male member, and the guide pin of Modification 4.

Hereinafter, embodiments of the present invention will be described in detail. In addition, the same number is attached | subjected to the structure part which has the same function, and duplication description is abbreviate | omitted.

FIG. 1 is a cross-sectional view showing the internal configuration of the centrifuge of the present invention. In this figure, the rotary shaft 3 whose axis 9 is vertical, the rotary head 2 attached to the upper part of the rotary shaft 3, the rotor 20 arranged on the upper part of the rotary head 2, and the upper part of the rotor 20 are shown. A covering lid 25 is shown. Although not shown, a motor for rotating the rotary shaft 3 and a casing for covering the whole are components of the centrifuge 1.

The upper side of the rotor 20 is a portion for inserting a sample, and includes a plurality of sample insertion portions 36. The rotor 20 also includes rotor holes 28 and 29 into which the rotary head 2 is inserted, a frame 21, male members 23-1 and 23-2, guide pins 24, and the like. The rotor hole 28 is a circular hole with a constant diameter, and the rotor hole 29 is a circular hole with a diameter that is smaller toward the inside of the hole. In this figure, two male members are arranged, but one member may be used, or three or more members may be used. The number of male members may be appropriately determined in consideration of the size of the rotor 20 and the like. The male mold members 23-1, 23-2 are rotatable around rotation shafts 22-1, 22-2 disposed horizontally inside the rotor hole 28, and their center of gravity is the rotation shafts 22-1, 22-2. 2 below. The male members 23-1 and 23-2 have convex portions 62-1 and 62-2 on the opposite side of the axis 9 of the rotary shaft 3 below the center of gravity. When assembling the rotor 20, the male members 23-1 and 23-2 are first attached to the frame 21, and then the frame 21 is attached to the rotor 20 for easy manufacture. The rotor 20 also includes through

holes

30 and 31 having a circular cross section around the axis 9. Screws (threaded portions) are formed in the through holes 31 formed in the frame 21.

The rotary head 2 includes a rotor coupling portion 6 and a drive pin 7 at the top. The rotor coupling portion 6 has a cylindrical shape centered on the axis 9 of the rotating shaft, and has an annular recess 8 on the inner surface. In addition, the rotary head 2 has a circular section 4 having a constant diameter and a circular section that fits in the rotor hole 28 and a circular truncated cone section that has a diameter that fits in the rotor hole 29 is increased toward the bottom. Also has 5. The lid 25 has a knob 26 and a screw portion 27. By rotating the knob 26, the through hole 31 and the screw portion 27 of the frame 21 are screwed, and the lid 25 is fixed to the rotor 20. Since the guide pin 24 can move only between the drive pins 7, when the rotary head 2 rotates, power is transmitted from the drive pin 7 to the guide pins 24, and the rotor 20 rotates. Even when the rotary head 2 stops, the drive pin 7 limits the movement range of the guide pin 24, so the rotor 20 stops together with the rotary head 2.

When the rotor 20 is placed on the rotary head 2 with the rotary shaft 3 stopped, the center of gravity of the male members 23-1, 23-2 is directly below the rotary shafts 22-1, 22-2. At this time, the male members 23-1 and 23-2 are inside the rotor coupling portion 6, and the convex portions 62-1 and 62-2 of the male members 23-1 and 23-2 are the rotor coupling portion 6. This is opposed to the concave portion 8.

When the rotary shaft 3 rotates, the convex parts 62-1 and 62-2 move so as to fit into the concave part 8. Then, when a force for separating the rotor 20 from the rotary head 2 is applied when the convex portions 62-1 and 62-2 are fitted in the concave portion 8, the convex portions 62-1 and 62-2 are fitted in the concave portion 8. Force is applied in the direction. For example, the normal line of the recess upper surface 11 that is the upper surface of the recesses 62-1 and 62-2 may be formed so as to pass through a position closer to the axis than the center of the rotation axis. That is, when the detachment force acts on the rotor and is lifted upward, from the contact point between the upper surface of the convex portions 62-1 and 62-2 (the convex contact surface 35-1 in FIG. 2) and the concave upper surface 11 The rotating shafts 22-1 and 22-2 may be arranged so that the drawn normal line passes through a position closer to the axis 9 than the centers 33-1 and 33-2 of the rotating shaft.

2 is an enlarged cross-sectional view of the rotor frame and the male member and the rotary head, FIG. 3 is an enlarged view of the rotor frame and the male member, and FIG. 4 is the male when rotating. It is sectional drawing which shows the relationship between a mold member and a rotary head. 3A is a plan view of the frame as viewed from above, FIG. 3B is a cross-sectional view when cut along the line AA, and FIG. 3C is a side view when viewed from the direction B of FIG. 3A. 2 and 4 show only the male member 23-1, only one male member may be used as described above, or two male members may be provided as shown in FIGS. Alternatively, three or more may be provided as described above. The concave portion 8 includes a concave bottom surface 10 that is recessed from the inner surface of the rotor coupling portion 6, a concave top surface 11 that contacts the convex portion 62-1 when a separation force is generated in the rotor 20, and an uppermost portion of the rotor coupling portion 6. It is comprised by the recessed part cylindrical part 12 located in. The convex portion 62-1 contacts the concave bottom surface 10 when the rotor 20 rotates, and the convex portion positioning surface 34-1 determines the posture (position) of the male member 23-1, and the rotor 20 generates a separation force. The convex portion contact surface 35-1 that comes into contact with the concave portion upper surface 11 is formed. As shown in FIG. 4, the normal line drawn from the contact portion of the concave upper surface 11 with the convex contact surface 35-1 passes through a position closer to the axis 9 than the center 33-1 of the rotation axis.

Since the centrifuge of the present invention has such a structure, it is not necessary to stop the screw when attaching the rotor to the rotary head. Also, it is not necessary to remove the screws when removing the rotor from the rotary head. Furthermore, even when a force that causes a rotor that is not assumed during rotation to be detached from the rotary head is applied, the convex portion and the concave portion are not separated. Therefore, both simple attachment and detachment and reliable fixing can be realized.

Principle of converting the force for separating the rotor into a force in the direction in which the convex portion fits into the concave portion Next, the principle for converting the force in which the rotor 20 is separated into a force in the direction in which the convex portion 62-1 fits into the concave portion 8 will be described. To do. FIG. 5 is a schematic diagram for explaining this principle. In this figure, the convex portion 62-1 is represented by a circle, and the male member 23-1 is represented by a line. In these figures, it is assumed that the mass of the male member 23-1 is concentrated on the convex portion 62-1. 5A shows a case where the concave upper surface 11 is horizontal, and FIG. 5B shows that the normal drawn from the contact point between the concave upper surface 11 and the convex 62-1 passes through a position farther from the axis 9 than the center 33-1 of the rotation axis. FIG. 5C shows a case where the normal drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position closer to the axial center 9 than the center 33-1 of the rotating shaft, and the separation force is generated. FIG. 5D shows a case where the normal drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotation axis. It shows when force is generated.

FIG. 5 shows a force F1 due to gravity, a force F2 due to centrifugal force, and a force F3 received by the convex portion 62-1 due to a force that causes the rotor 20 to be detached among the forces acting on the convex portion 62-1. In addition to these forces, the convex portion 62-1 has a reaction force in which the concave bottom surface 10 and the concave top surface 11 push back the convex portion 62-1, and a male member 23-1 has a force to pull the convex portion 62-1. However, these forces are generated in order to balance F1 to F3, and are not shown in the figure.

The direction of the force F1 is downward, and the direction of the force F2 is the right direction in the figure. Further, since the male member 23-1 is rotatable around the rotation axis, the direction of the force F3 is the direction of the center 33-1 of the rotation axis. Since the convex portion 62-1 tends to move in the direction of the sum of these forces, it tries to move counterclockwise or clockwise. When trying to move counterclockwise, the convex portion 62-1 tends to fit into the concave portion 8. As a result, the convex portion 62-1 is pressed against the concave top surface 11 or the concave bottom surface 10. The reaction force from the concave top surface 11 or the concave bottom surface 10 is also applied as a force acting on the convex portion 62-1, and the force acting on the convex portion 62-1 is balanced. On the other hand, when trying to move clockwise, the convex portion 62-1 is detached from the concave portion 8, and the rotor 20 may be detached.

First, consider the case where there is no force F3. 5A, 5B, and 5C, the convex portion 62-1 tries to move so that the total direction of the force F1 and the force F2 coincides with the line of the male member 23-1. Therefore, when the rotational speed is increased and F2 is sufficiently large, the convex portion 62-1 fits into the concave portion 8. For example, in the case of 1000 rotations per minute, F2 is 10 times or more F1 at a position 1 cm away from the axis 9. In the case of FIG. 5C, the normal line drawn from the contact point between the concave upper surface 11 and the convex part 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotation axis. The convex portion 62-1 is in contact with only the bottom surface 10 of the recess, and there is a gap between the top surface 11 of the recess.

On the other hand, when force F3 is applied, the force relationship changes. In the following description, the force F3 is perpendicular to the recess upper surface 11 and the force F31 is parallel to the force F32. If the rotation speed is constant, the force F1 and the force F2 are constant. However, a force F3 that is not expected in an accident in which the rotor 20 comes off is applied. That is, when the force F3 is increased, it can be determined in what direction the upper surface 11 of the concave portion 11 should be oriented by confirming whether or not the force that causes the convex portion 62-1 to fit into the concave portion 8 is applied.

First, the force parallel to the concave upper surface 11 is examined. In the case of FIG. 5A and FIG. 5B, if the force F3 increases, the force F32 also increases, so that the force with which the convex portion 62-1 attempts to fit into the concave portion 8 becomes weak. In addition, since the force F3 is an unexpected force, it is impossible to design how much force the convex portion 62-1 tries to fit into the concave portion 8 remains. Therefore, there is a risk that force is applied in the direction of disengagement.

On the other hand, when the normal line drawn from the contact point between the concave upper surface 11 and the convex portion 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotating shaft, the convex portion 62 is present when there is no force F3. There is a gap between -1 and the upper surface 11 of the recess (FIG. 5C). When a strong detachment force is applied to the rotor 20, as shown in FIG. 5D, the center 33-1 of the rotating shaft is lifted, and the convex portion 62-1 and the concave upper surface 11 come into contact with each other. Here, 33'-1 in FIG. 5D indicates the position of the center of the rotating shaft before the force F3 is applied. In the case of FIG. 5D, if the force F3 increases, the force F32 also increases, so that the force with which the convex portion 62-1 attempts to fit into the concave portion 8 increases. Therefore, when the normal drawn from the contact point between the concave upper surface 11 and the convex 62-1 passes through a position closer to the axis 9 than the center 33-1 of the rotation axis (the normal of the concave upper surface is more than the rotation axis). In the case where it is formed so as to pass through a position close to the axial center), the force for separating the rotor 20 can be converted into a force in the direction in which the convex portion 62-1 fits into the concave portion 8, so Even when a force for separating from the rotary head is applied, the convex portion and the concave portion are not separated.

Thus, according to the present invention, it is not necessary to stop the screw when attaching the rotor to the rotary head. Also, it is not necessary to remove the screws when removing the rotor from the rotary head. Furthermore, even when a force that causes a rotor that is not assumed during rotation to be detached from the rotary head is applied, the convex portion and the concave portion are not separated. Therefore, both simple attachment and detachment and reliable fixing can be realized.

[Modification 1]
In the first embodiment, when the center of gravity of the male members 23-1, 23-2 is directly below the rotation shafts 22-1, 22-2, the male members 23-1, 23-2 are connected to the rotor coupling portion 6. It was arranged to be inside. However, for the sake of design, it may be desired to adjust the position of the center of gravity when the rotary shaft 3 is stopped to a position that is not directly below the rotary shafts 22-1 and 22-2. 6 is an enlarged cross-sectional view of the rotor frame, the male member, and the rotary head portion according to the first modification. FIG. 7 is an enlarged view of the rotor frame, the male member, and the rotary head portion according to the first modification. FIG. In this modification, an example in which the position of the center of gravity in a state where the rotating shaft 3 is stopped is adjusted to a position closer to the axis 9 than directly below the rotating shafts 22-1 and 22-2. In this modification, the frame 21 is provided with an annular elastic body 61, and the male members 23-1 and 23-2 are pushed toward the axis 9 side.
Thus, the position of the center of gravity in a state where the rotating shaft 3 is stopped can be adjusted, so that the degree of freedom in design can be increased.

[Modification 2]
When a small rotor (approximately 5 kg or less) rotates at a high speed (18000 to 22000 rotations), vibration is caused by a minute gap between the rotor holes 28 and 29 and the cylindrical portion 4 and the truncated cone portion 5 of the rotary head 2. May occur. This modification solves this problem.

FIG. 8 is an enlarged cross-sectional view of the rotor frame, the male member portion, and the rotary head portion of the second modification example with the rotary shaft stopped, and FIG. 9 is a diagram showing the frame 21 of the second modification example. 10 is an enlarged cross-sectional view of the rotor frame, the male member portion, and the rotary head portion of the modified example 2 with the rotating shaft rotated. 9A is a side view of the frame 21 viewed from the C side of FIG. 8, and FIG. 9B is a side view of the frame 21 viewed from the D side of FIG. 10A is an enlarged cross-sectional view of the rotor frame, the male member, and the rotary head, FIG. 10B is a diagram illustrating the force applied to the second male member 40, and FIG. 10C is applied to the male member 23-1. It is a figure which shows force. In this modification, the rotor 20 also includes a second male member 40. The second male member 40 is rotatable about a rotating shaft 22-2 disposed horizontally inside the rotor hole 28, and has a center of gravity below the rotating shaft 22-2 and rotates below the center of gravity. A second convex portion 41 is provided on the side opposite to the shaft 3. In this modification, the thickness of the male member 23-1 is w / 2 with respect to the thickness w of the second male member 40.

When the rotor 20 is disposed on the rotary head 2 with the rotary shaft 3 stopped, the center of gravity of the second male member 40 is directly below the rotary shaft 22-2. At this time, the second male member 40 is inside the rotor coupling portion 6, and the second convex portion 41 of the second male member 40 faces the concave portion 8 of the rotor coupling portion 6. When the rotating shaft 3 rotates, the second convex portion 41 moves so as to come into contact with a part of the concave portion (in FIG. 10, the concave portion upper surface 11 and the concave portion boundary line 42 of the concave cylindrical portion 12). The male member 23-1 also moves as described in the first embodiment, and the convex portion 62-1 contacts the concave bottom surface 10. As described above, since the male member 23-1 and the second male member 40 are asymmetric, a delicate force imbalance occurs, and a force that the rotor 20 presses somewhere on the rotary head 2 is generated. Since this force acts, the minute gaps between the rotor holes 28 and 29, the cylindrical portion 4 and the truncated cone portion 5 are moved to one side, so that vibration can be reduced.

More specifically, it is considered to be based on the following principle. By making the thickness of the male member 23-1 half that of the second male member 40, the male member 23-1 becomes lighter than the second male member 40. Accordingly, the centrifugal force F1 of the second male member 40 that acts during rotation is greater than the centrifugal force F4 of the male member 23-1. First, consider the moment balance when the center 33-2 of the rotating shaft is a fulcrum. The centrifugal force F1 tries to turn the rotating shaft 22-2 clockwise. In addition, since the surface where the second convex portion 41 and the concave boundary line 42 are in contact is not parallel to the axis 9, the second convex portion 41 is forced from the concave boundary line 42 by the force F 2 (contact) unless friction is considered. The force in the normal direction of the surface is The force F2 tries to turn the rotating shaft 22-2 counterclockwise. The moments generated by these forces are balanced. Therefore, the total force F3 of the centrifugal force F1 and the force F2 is applied to the rotating shaft 22-2. Next, the moment balance when the center 33-1 of the rotating shaft is used as a fulcrum will be considered. The centrifugal force F4 tries to turn the rotating shaft 22-1 counterclockwise. Further, since the concave bottom surface 10 is a surface parallel to the axis 9, the convex portion 62-1 receives the force F5 in the direction opposite to the centrifugal force F4. The force F5 tries to turn the rotating shaft 22-1 clockwise. The moments generated by these forces are balanced. Therefore, the total force F6 of the centrifugal force F4 and the force F5 is applied to the rotating shaft 22-1. That is, the force F3 and the force F6 are applied to the rotor 20, and the rotor 20 is generally pressed in the lower left direction in FIG. Actually, it is considered that a more complicated force is applied due to the addition of friction and the like, but in any case, a subtle force generated by making the male member 23-1 and the second male member 40 asymmetrical. The vibration is reduced by the unbalance (the force that the second male member 40 receives by the rotation of the rotating shaft 3 and the force that the male member 23-1 receives by the rotation of the rotating shaft 3 are not balanced). It is thought that.

In the present invention, the rotor 20 is provided with a male member 23-1 and a second male member 40 which are members that are moved by centrifugal force. Therefore, since the degree of unbalance can be adjusted optimally in consideration of the weight and shape of the rotor, vibration can be sufficiently reduced for each type of rotor.

[Modification 3]
In the description of the embodiment and the modification so far, when the rotation of the rotary shaft 3 stops, the male members 23-1 and 23-2 return to the inner side of the rotor coupling portion 6 due to gravity or the like. Explained that it can be removed. However, the sample may leak and adhere to the periphery of the male members 23-1, 23-2. In such a case, it is assumed that the male members 23-1 and 23-2 do not return to the inside of the rotor coupling portion 6 even if the rotation of the rotary shaft 3 stops. This modification solves this problem.

11 is an enlarged cross-sectional view of the rotor frame, the male member, and the rotary head in a state in which the male member does not return to the inside of the rotor coupling portion even when the rotating shaft is stopped. FIG. 12 is a male member. FIG. 5 is an enlarged cross-sectional view of a rotor frame, a male member portion, and a rotary head portion in a state where the rotor is returned to the inside of the rotor coupling portion. In this modification, the male members 23-1, 23-2 are positioned above the rotary shafts 22-1, 22-2 and when the convex portions 62-1 and 62-2 are fitted in the concave portion 8. Protrusions 43-1 and 43-2 that protrude inside the through holes 31 are provided.

If the rotation of the centrifuge 1 stops and cannot be removed when attempting to remove the rotor 20, the male members 23-1 and 23-2 may be returned to the inside of the rotor coupling portion 6 as follows. . First, the lid 25 is removed so that the through

holes

30 and 31 can be seen. Then, the release shaft 44 whose tip is thin is inserted into the through

holes

30 and 31. Since the release shaft 44 has a thin tip and gradually becomes thicker near the handle, the protrusion 43-1 is pushed in the right direction in the figure and the protrusion 43-2 is pushed in the left direction in the figure. Accordingly, if the release shaft 44 is pushed deeply as shown in FIG. 12, the male members 23-1 and 23-2 can be returned to the inside of the rotor coupling portion 6. If a screw is formed in a portion of the release shaft 44 that contacts the through hole 31 and the release shaft 44 is pushed in by using the screw formed in the through hole 31 of the frame 21, the release shaft can be easily pushed. 44 can be pushed in.

Therefore, even if the rotation of the rotary shaft 3 stops, even if there occurs a problem that the male members 23-1 and 23-2 do not return to the inside of the rotor coupling portion 6, the male members 23-1 and 23-2 are connected to the rotor. It can return to the inner side of the coupling part 6 and the rotor 20 can be removed.

[Modification 4]
In the case of the first embodiment, the positional relationship between the rotor 20 and the rotary head 2 is determined by the guide pin 24 being constrained between the drive pins 7. However, since the guide pin 24 is movable between the drive pins 7, a slip occurs between the rotor 20 and the rotary head 2. Further, the rotor 20 is arranged on the upper portion of the rotary head 2, but the rotor 20 is supported by the truncated cone portion 5. Therefore, the above-described sliding causes wear in the rotor hole 29 and the truncated cone portion 5 in particular. In this modification, the slip between the rotor 20 and the rotary head 2 is eliminated.

13 is an enlarged cross-sectional view of a rotor frame, a male member, a guide pin portion, and a rotary head portion of a fourth modification. FIG. 14 is a plan view of the rotary head of the fourth modification as viewed from above. These are the figures which expanded the flame | frame of the modification 4, the male type member, and the guide pin. 15A is a side view, and FIG. 15B is a bottom view as seen from the lower side. Although only one male member is shown in FIGS. 13 and 15, two or more male members may be provided. The guide pin 53 of this modification is longer than the guide pin 24 of the first embodiment. The rotary head 2 includes a drive hole 51 into which the guide pin 53 is inserted.

The rotor 20 of this modification also includes a guide pin 53 that enters the inside of the rotor coupling portion 6 in the vicinity of the male member 23-1. The rotary head 2 also includes a drive hole 51 into which the guide pin 53 is inserted. When the rotor 20 is attached from the top of the rotary head 2, first, the guide pin 53 is limited by the drive pin 7 in the range of the rotation direction with the axis 9 as the rotation axis. The tip of the guide pin 53 is inserted into the drive hole 51. Since the position of the guide pin 53 is limited to the drive hole 51, the position of the guide pin 53 is determined.

As described above, since the position of the guide pin 53 is fixed by the drive hole 51, no slip occurs between the rotor 20 and the rotary head 2. Therefore, wear of the rotor hole 29 and the truncated cone portion 5 can be prevented.

In addition, you may provide the air hole 54 shown with the dotted line in FIG. The air hole 54 plays a role of releasing the air trapped between the frame 21 and the rotor coupling portion 6 to the outside. When the frame 21 and the rotor coupling portion 6 are manufactured with high accuracy, the air trapped between the frame 21 and the rotor coupling portion 6 causes the rotor 20 not to descend smoothly onto the rotary head 2, causing air to escape. Therefore, it may descend slowly. If it descends slowly in this way, an extra time is spent for the operator, and it is easy to lead to an installation error of the rotor 20. Therefore, such a problem can be solved by providing the air holes 54.

The present invention can be used for a centrifuge provided with a rotary head attached to the upper part of a rotary shaft whose axis is in the vertical direction and a rotor arranged on the upper part of the rotary head.

DESCRIPTION OF SYMBOLS 1 Centrifugal separator 2 Rotating head 3 Rotating shaft 4 Cylindrical part 5 Frustum part 6 Rotor coupling part 7 Drive pin 8 Concave part 9 Axis center 10 Concave bottom face 11 Concave top face 12 Concave cylindrical part 20 Rotor 21 Frame 22 Rotating shaft 23 Male member 24 Guide pin 25 Lid 26 Knob 27

Screw part

28, 29

Rotor hole

30, 31 Through hole 33 Center of rotating shaft 34 Convex part positioning surface 35 Convex part contact surface 36 Sample insertion part 40 Second male member 41 Second convex part 42 Recess boundary line 43 Projection 44 Release shaft 51 Drive hole 53 Guide pin 54 Air hole 61 Elastic body 62 Projection

Claims

A centrifuge having a rotary head attached to an upper part of a rotary shaft whose axis is in a vertical direction, and a rotor disposed on the upper part of the rotary head,
The rotor is
A rotor hole into which the rotating head is inserted;
A male member that is rotatable about a rotating shaft that is horizontally disposed inside the rotor hole, has a center of gravity below the rotating shaft, and has a convex portion on the opposite side of the rotating shaft below the center of gravity. And
The rotary head has a cylindrical shape centered on the axis of the rotary shaft at the top, and a rotor coupling portion having an annular recess on the inner surface,
When the rotor is disposed on the rotary head with the rotating shaft stopped, the male member is inside the rotor coupling portion, and the convex portion of the male member is the rotor coupling. Facing the recess of the part,
The convex portion is movable so as to fit into the concave portion by rotation of the rotary shaft,
Centrifugation characterized in that when the convex part is fitted in the concave part, a force is applied to the convex part in the direction of fitting into the concave part when a force is applied to detach the rotor from the rotary head. Machine.
A centrifuge having a rotary head attached to an upper part of a rotary shaft whose axis is in a vertical direction, and a rotor disposed on the upper part of the rotary head,
The rotor is
A rotor hole into which the rotating head is inserted;
A male member that is rotatable about a rotating shaft that is horizontally disposed inside the rotor hole, has a center of gravity below the rotating shaft, and has a convex portion on the opposite side of the rotating shaft below the center of gravity. And
The rotary head has a cylindrical shape centered on the axis of the rotary shaft at the top, and a rotor coupling portion having an annular recess on the inner surface,
When the rotor is disposed on the rotary head with the rotating shaft stopped, the male member is inside the rotor coupling portion, and the convex portion of the male member is the rotor coupling. Facing the recess of the part,
The convex portion is movable so as to fit into the concave portion by rotation of the rotary shaft,
The normal line of the upper surface of the recess, which is the upper surface of the recess, passes through a position closer to the axis than the center of the rotation shaft.
The centrifuge according to claim 1 or 2,
The rotor is
When the rotor is disposed on the rotary head with the rotating shaft stopped, the male member is pressed in the axial direction so that the male member is inside the rotor coupling portion. The centrifuge is also provided with an annular elastic body.
The centrifuge according to any one of claims 1 to 3,
The rotor is rotatable about a rotation shaft disposed horizontally inside the rotor hole, and has a center of gravity below the rotation shaft and a second convex on the opposite side of the rotation shaft below the center of gravity. A second male member having a portion,
When the rotor is disposed on the rotating head with the rotating shaft stopped, the second male member is inside the rotor coupling portion and the second male member is the second of the second male member. The convex portion faces the concave portion of the rotor coupling portion,
The rotation of the rotating shaft moves the second convex portion so as to contact a part of the concave portion, the force received by the second male member by the rotation of the rotating shaft, and the male member is the rotating shaft. A centrifugal separator characterized by being unable to balance the force received by the rotation of the.
The centrifuge according to any one of claims 1 to 3,
The rotor is rotatable about a rotation shaft disposed horizontally inside the rotor hole, and has a center of gravity below the rotation shaft and a second convex on the opposite side of the rotation shaft below the center of gravity. A second male member having a portion,
When the rotor is disposed on the rotating head with the rotating shaft stopped, the second male member is inside the rotor coupling portion and the second male member is the second of the second male member. The convex portion faces the concave portion of the rotor coupling portion,
The rotation of the rotating shaft causes the second convex portion to move so as to contact a part of the concave portion, and the portion of the concave portion brings the rotor toward the second male member side toward the second convex portion. The centrifuge characterized by adding.
The centrifuge according to any one of claims 1 to 5,
The rotor also includes a through hole having a circular cross section centered on the axis,
The male member has a protruding portion that protrudes inside the through hole when the convex portion is fitted in the concave portion above the rotating shaft.
The centrifuge according to any one of claims 1 to 6,
The rotor also includes a guide pin that enters the inside of the rotor coupling portion in the vicinity of the male member,
The rotary head also includes a drive hole into which the guide pin is inserted.
A rotating shaft whose axis is in the vertical direction;
The centrifuge having a cylindrical shape centered on the axis of the rotating shaft at the top, a rotor coupling portion having an annular recess on the inner surface, and a rotating head attached to the top of the rotating shaft. A centrifuge rotor disposed on top of a rotating head,
A rotor hole into which the rotating head is inserted;
A male member that is rotatable about a rotating shaft that is horizontally disposed inside the rotor hole, has a center of gravity below the rotating shaft, and has a convex portion on the opposite side of the rotating shaft below the center of gravity. And
When the rotor is disposed on the rotary head with the rotating shaft stopped, the male member is inside the rotor coupling portion, and the convex portion of the male member is the rotor coupling. Facing the recess of the part,
The convex portion is movable so as to fit into the concave portion by rotation of the rotary shaft,
When the concave upper surface which is the upper surface of the concave part and the convex part are in contact with each other, the normal line of the contact surface passes through a position closer to the axial center than the center of the rotating shaft. Rotor.