JP2014147876A - Centrifuge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce certainly a possibility that the outermost shell of a centrifuge body runs off to a clearance envelope during the time of a rotor breaking test, by a simple constitution.SOLUTION: Since a projection shape viewed from directly above a centrifuge body 1 is constituted so as not to run off to the outside the range of a clearance envelope 20 specified by the international safety standard (IEC 61010-2-020), even if the centrifuge body 1 rotates the center-of-gravity position 21 as a center during the time of a rotor breaking test, a margin can be given between the outermost shell of the centrifuge body 1 and the clearance envelope 20. Specifically, the four corners 2a to 2d of the outermost shell of a frame 2 in a perpendicular direction to an axial line prolonged perpendicularly from the center-of-gravity position 21 of the centrifuge body 1 are chamfered so as to be sunk down on the circumference in the horizontal direction centering on the center-of-gravity position 21.

Description

  The present invention relates to a centrifuge such as a centrifuge equipped with a rotor for separating and purifying a sample.

  An example of the centrifuge is the above-described centrifuge. This centrifuge is used to inject a sample to be separated (for example, a culture solution or blood) into a tube or bottle and insert it into a rotor. By rotating the rotor at high speed, centrifugal force is applied to the sample to separate the sample, Purification is performed.

  The rotational speed of the rotor varies depending on the application, and a product group ranging from a low speed (a maximum rotational speed of several thousand revolutions) to a high speed (a maximum rotational speed of 150,000 rpm) is commercially available. By the way, as shown in Patent Document 1, a large centrifugal force is required to quickly separate a sample. Therefore, a large centrifugal force is also applied to the rotor and an internal stress is generated. Manufacturers of centrifuges are designed with sufficient tolerance so that accidents such as destruction do not occur due to these. It is necessary to secure.

  Based on this concept, the international safety standard (IEC 61010-2-020) requires that a test of the maximum accident be performed and that it is proved to be safe. In response to this requirement, the above-described Patent Document 1 and Patent Documents 2 to 5 propose many techniques related to defense when the rotor breaks.

  In other words, with the idea of assuming that it cannot occur in the maximum possible accident, normally the rotor that can be used with a centrifuge is intentionally cut into the rotor that has the maximum rotational energy and destroyed in the maximum rotational energy state. A rotor destructive test is performed to confirm safety.

  There is a concept of a clearance envelope as a criterion for confirming the safety. In the rotor destructive test, as shown in FIGS. 3 to 7 of Patent Document 2 described above, the broken rotor collides with the main body rotor chamber, and the colliding force is also transmitted to the centrifuge body, and the entire centrifuge Rotate.

  Here, the clearance envelope means a space in the range of 300 mm from the outermost shell of the centrifuge, and there is a criterion that the centrifuge should not protrude outside the clearance envelope during the rotor destructive test. .

  In this case, for example, in a centrifuge having a frame in which the projection shape seen from right above is circular as shown in Patent Document 6, the inside of the line 300 mm away from the outermost shell is a circular clearance envelope. Become. Moreover, it is known from the test results so far that the rotational movement of the centrifuge rotates about the center of gravity of the centrifuge. When the center of gravity of the circular centrifuge is substantially coincident with the center of the circle, the possibility of protruding out of the clearance envelope is very small even if the centrifuge is broken and the centrifuge rotates.

  That is, on the concept of taking into account the safety of the clearance envelope, it is best that the frame of the centrifuge has a circular projected shape viewed from directly above and the center of gravity coincides with the center of the circle.

JP 2005-349260 A JP 2005-305400 A JP-A-50-56888 JP 2001-104827 A JP-A-2005-230744 JP 2006-81986

  As described above, the centrifuge frame is best in terms of the safety concept of the clearance envelope in that the projected shape seen from directly above is circular and the position of the center of gravity coincides with the center of the circle.

  However, many centrifuges are equipped with not only a motor that rotates the rotor, but also a control unit that controls them, a refrigerator that cools the heat generated by the rotated rotor, and the like. In addition, since the control unit, the refrigerator, and the like are housed in a rectangular casing, if the rectangular casing is to be mounted inside the circular centrifuge frame, it is necessary to devise the arrangement. In addition, useless space is generated inside the frame.

  For this reason, the frame of the centrifuge is often rectangular so that the rectangular housing can be relatively easily arranged and no useless space is generated inside. Here, the case where the frame of the centrifuge is rectangular is considered.

That is, as described above, since the clearance envelope is determined to be 300 mm from the outermost shell of the centrifuge, for example, as shown in FIG. In the centrifuge, the diagonal length is about √ (500 ² +500 ² ) = 707 mm, and one side of the clearance envelope 20 is 500 + 300 × 2 = 1100 mm.

  At this time, assuming that the center of gravity position 21 of the centrifuge body 1 is substantially in the middle of the square frame 2, even if the centrifuge body 1 rotates and moves as shown by the broken line due to the rotor breakage, the outermost shell ( In this case, the shortest distance between the corner envelope is the outermost shell) and the clearance envelope 20 is about 200 mm, which is not a problem.

  However, in some centrifuges to which international safety standards (IEC 61010-2-020) are applied, for example, as shown in FIG. 7, the size of the frame 2 of the centrifuge body 1 is 800 mm wide × depth. Some are as large as 900 mm. In this case, the distance between the corners 2a to 2d, which is the outermost shell of the frame 2, and the clearance envelope 20 is small. In particular, the distance between the outermost shell (in this case, the corners 2b and 2d) and the clearance envelope 20 is small. The shortest distance becomes as small as about 100 mm.

  Furthermore, the movement of the centrifuge body 1 due to the rotor breakage not only rotates around the center of gravity, but also causes some lateral movement, etc. Therefore, at a distance of 100 mm, a part of the frame 2 of the centrifuge body 1 (corner portion 2a, etc.) is cleared. The possibility of protruding from the envelope 20 is increased. In other words, as can be seen by comparing the centrifuges of FIGS. 6 and 7, the larger the size of the frame 2 of the centrifuge body 1 is, the more the protrusion occurs due to the rotational movement when the rotor is broken.

  Further, consider the case where an exhaust duct is attached to the back side of the centrifuge body to improve the cooling capacity as in the centrifuge shown in Japanese Utility Model Laid-Open No. 6-15745.

  That is, for example, as shown in FIG. 8, the duct 22 is made of a thin plate of iron or aluminum and is made lighter than the weight of the centrifuge body 1. It does not affect the center of gravity position 21 of the centrifuge body 1 at all. Therefore, when the duct 22 having a depth of 150 mm is mounted on the back side of the frame 2 of the centrifuge body 1 having a width of 800 mm and a depth of 900 mm, the centrifuge body 1 rotates around the center of gravity due to the destruction of the rotor, so that it is far from the center of gravity position 21. The corner 22 a (or 22 b) that is the outermost shell of the duct 22 protrudes outside the clearance envelope 20.

  Thus, when the overall shape of the centrifuge becomes rectangular, the outermost shell far from the gravity center position 21 protrudes outside the clearance envelope 20. In addition, depending on the centrifuge, the center of gravity position 21 may not be in the middle of the centrifuge body 1 but in a biased position. In this case as well, the outermost shell far from the center of gravity position 21 is the clearance envelope 20. It will protrude outside.

  The present invention has been made in view of such a situation, and with a simple configuration, the possibility that the outermost shell of the centrifuge body protrudes outside the clearance envelope during the rotor destructive test can be reliably reduced. The object is to provide a centrifuge.

The centrifuge of the present invention is a centrifuge having a centrifuge body that holds a sample to be separated and rotates at a high speed, and a rotor chamber that houses the rotor in a frame. A corner of the projected shape viewed from directly above is chamfered.
Further, the outermost shell of the frame in a direction orthogonal to the axis extending in the vertical direction from the center of gravity position of the centrifuge body is chamfered so as to fit on the circumference in the horizontal direction centering on the center of gravity position. It is characterized by.
Further, the centrifuge body is provided with a projecting member attached to the outer periphery of the frame, and the outermost of the projecting member in a direction orthogonal to an axis extending in the vertical direction from the center of gravity position of the centrifuge body. The shell is chamfered so as to fit on a circumference in the horizontal direction centered on the position of the center of gravity.
In addition, the chamfer is a curved shape.
Further, the chamfer is a linear shape.
Further, the chamfering is a combination shape of a plurality of straight lines approximated to a circumferential shape.
Further, the centrifuge of the present invention is a centrifuge having a centrifuge body in which a rotor that holds a sample to be separated and rotates at high speed and a rotor chamber that houses the rotor is housed in a frame, the centrifuge The main body is provided with a projecting member attached to the outer periphery of the frame, and the outermost shell of the projecting member in the direction orthogonal to the axis extending in the vertical direction from the center of gravity position of the centrifuge body is the center of gravity position. A first outermost shell of the projecting member from the position of the center of gravity in a direction perpendicular to the axis in the chamfered state. The distance from the center of gravity in the direction orthogonal to the axis to the second outermost shell of the projecting member located inside the first outermost shell is r2. , Each relationship is r >, Characterized in that it has become a r2.
In the centrifuge of the present invention, by adopting a configuration in which the corners of the projected shape seen from directly above the centrifuge body are chamfered, even if the centrifuge body rotates around the center of gravity during the rotor destructive test, A margin can be provided between the outermost shell of the centrifuge body and the clearance envelope defined by the international safety standard (IEC 61010-2-020).

  According to the centrifuge of the present invention, even when the centrifuge body rotates around the position of the center of gravity during the rotor destructive test, a margin can be provided between the outermost shell of the centrifuge body and the clearance envelope. Therefore, with a simple configuration, it is possible to reliably reduce the possibility that the outermost shell of the centrifuge body protrudes outside the clearance envelope during the rotor destructive test.

It is a front view which is a case where the centrifuge of this invention is applied to a centrifuge, and the centrifuge body is partly cut away. It is a projection figure at the time of seeing the centrifuge main body of the centrifuge of FIG. 1 from right above. It is a projection view at the time of seeing the centrifuge body of the other centrifuge at the time of changing the gravity center position of the centrifuge body of the centrifuge of FIG. 1 from right above. It is a projection view at the time of seeing the centrifuge main body of the other centrifuge at the time of changing the structure of the centrifuge main body of the centrifuge of FIG. 1 from right above. It is a projection view at the time of seeing the centrifuge main body of the other centrifuge at the time of changing the structure of the centrifuge main body of the centrifuge of FIG. 1 from right above. It is a projection figure at the time of seeing the centrifuge main body of the conventional centrifuge from right above. It is a projection figure at the time of seeing the centrifuge main body of the other conventional centrifuge from right above. It is a projection figure at the time of seeing the centrifuge main body of the other conventional centrifuge from right above.

  Hereinafter, an embodiment in which the centrifuge of the present invention is applied to a centrifuge will be described with reference to FIGS. In the following drawings, parts common to those in FIGS. 6 to 8 are described with the same reference numerals.

  First, as shown in FIG. 1, a frame 2 is provided in a centrifuge body 1 of a centrifuge. Reference numeral 1a denotes an axis extending in the vertical direction from a later-described center of gravity position 21 of the centrifuge body 1. A partition plate 3 is provided inside the frame 2 so as to divide the upper and lower parts into two. An upper chamber 4 and a lower chamber 5 are configured by the partition plate 3.

  A substantially circular opening 6 is formed in the partition plate 3. The opening 6 and a substantially circular opening 9 provided in the lower part of the rotor chamber 8 having a cylindrical casing 7 serving as a protective wall (protector) are arranged concentrically.

  A bowl 11 forming the rotor chamber 10 is arranged in the rotor chamber portion 8. A space between the bowl 11 and the cylindrical casing 7 is filled with a foam material 12. Thereby, the bowl 11, the foam material 12, and the cylindrical casing 7 are integrated, and one protective part is formed by these. Note that an evaporator 13 around which a pipe (made of copper) for circulating a coolant for cooling the rotor chamber 10 is wound is fixedly disposed on the outer peripheral portion of the bowl 11.

  A rotor 14 is disposed inside the rotor chamber 10. The illustrated rotor 14 is of a type called an ankle rotor, but is not limited to this example, and a type of a rotor called a swing rotor or a vertical rotor can be mounted. As is well known, the rotor 14 has various sizes depending on the volume of the sample to be mounted.

  A motor 15 for rotating the rotor 14 is disposed in the lower chamber 5. The drive shaft portion 16 of the motor 15 is inserted through the openings 6 and 9 described above and is connected to the rotor 14. The drive shaft 16 of the motor 15 is screwed to the partition plate 3 via a plurality of vibration isolating rubbers 17 and the like.

  A door 19 having an operation panel portion 18 is provided on the upper portion of the rotor chamber 10 so as to be freely opened and closed. Although not shown, the lower chamber 5 includes a refrigerator that compresses and circulates a refrigerant for cooling the rotor chamber 10, a radiator, a fan, an exhaust port, and the like for cooling the refrigerant compressed by the refrigerator. Is provided.

  The operating conditions of the centrifuge are determined by input values such as the rotational speed, operating time, and set temperature that are input by operating the operation panel unit 18 described above. Note that, as described above, the centrifuge needs to take measures so as not to protrude outside the range of the clearance envelope 20 described later defined in the international safety standard (IEC 61010-2-020).

  Such a countermeasure will be described with reference to FIG. In addition, the figure is the projection figure which looked at the centrifuge body 1 of the centrifuge from right above. Moreover, the frame 2 of the centrifuge body 1 indicated by a solid line (before movement) has a width of 800 mm × a depth of 900 mm. And the clearance envelope 20 shown with a dashed-dotted line is shown in the position of 300 mm from the outer side of the flame | frame 2 shown as a continuous line (before movement). Moreover, the gravity center position 21 shall be in the center of the centrifuge body 1 for convenience of explanation.

  A frame 2 indicated by a wavy line (after movement or during movement) is a case where the centrifuge body 1 rotates around the center of gravity position 21 during the rotor destructive test, and the outermost shell of the frame 2 (in the illustrated example, The distance between the corner 2b (or 2d) and the clearance envelope 20 is shown to be the shortest.

  The outermost shell in this embodiment is the longest in the direction orthogonal to the above-described axis 1a extending in the vertical direction from the center of gravity position 21 of the centrifuge body 1 (indicated by the symbol a). ) Portion, and corresponds to, for example, the corner portions 2a to 2d in the illustrated example.

  As shown in the figure, the frame 2 in this embodiment is a length from the gravity center position 21 of the centrifuge body 1 to the outermost shell of the frame 2 in a direction orthogonal to the axis 1a extending in the vertical direction. Is configured not to protrude outside the range of the clearance envelope 20 defined by the international safety standard (IEC 61010-2-020).

  Specifically, for example, the corners 2a to 2d at the four corners of the frame 2 of the centrifuge body 1 are chamfered so as to fit on a circumference (here, φ1100 mm) in the horizontal direction centered on the gravity center position 21. . In this way, the shortest distance between, for example, the corner 2b of the frame 2 and the clearance envelope 20 indicated by the wavy line (after movement or during movement) is 150 mm.

  Incidentally, in the above-described centrifuge shown in FIG. 7 having the same external dimensions as the centrifuge body 1 in the present embodiment, the corner 2b of the frame 2 and the clearance envelope indicated by the wavy line (after movement or during movement). The shortest distance to 20 is 100 mm.

  In this way, the distance from the clearance envelope 20 can be increased by 1.5 times compared to the conventional one by simply chamfering the corners 2a to 2d at the four corners of the frame 2 of the centrifuge body 1.

  Thus, in this embodiment, the projection shape seen from right above the centrifuge body 1 does not protrude outside the range of the clearance envelope 20 defined by the international safety standard (IEC 61010-2-020). It was configured as follows. Specifically, the corners 2a to 2d at the four corners that are the outermost shells of the frame 2 in a direction orthogonal to the axis 1a extending in the vertical direction from the gravity center position 21 of the centrifuge body 1 are centered on the gravity center position 21. Chamfered to fit on the horizontal circumference.

  As a result, even if the centrifuge body 1 rotates around the center of gravity position 21 during the rotor destructive test, a margin can be provided between the outermost shell of the centrifuge body 1 and the clearance envelope 20. With this configuration, it is possible to reliably reduce the possibility that the outermost shell of the centrifuge body 1 protrudes outside the clearance envelope during the rotor destructive test.

  The chamfering of the outermost shell of the centrifuge body 1 may be a curved shape, a linear shape, or a combined shape of a plurality of straight lines approximated to a circumferential shape. May be. In any case, the outermost shell of the centrifuge body 1 protrudes outside the clearance envelope 20 by chamfering the corners 2a to 2d at the four corners of the frame 2 of the centrifuge body 1 in any one of these shapes. The possibility can be reliably reduced. Furthermore, the design range of the centrifuge can be expanded.

  Moreover, although this embodiment demonstrated as a case where the corner | angular parts 2a-2d of the four corners of the flame | frame 2 of the centrifuge body 1 were chamfered, it is not necessary to chamfer the corner | angular parts 2a-2d of four corners.

  That is, for example, as shown in FIG. 3, depending on the centrifuge, the center of gravity 21 may be deviated from the center of the centrifuge body 1 as indicated by reference numeral 21a. In this case, if the centrifuge body 1 rotates around the center of gravity position 21a during the rotor destructive test, the centrifuge should be chamfered so as to fit on the circumference (here, φ1100 mm) in the horizontal direction around the center of gravity position 21a. Good.

  In this case, as shown in the figure, the corners 2a, 2b, and 2d are expected to be the outermost shell of the frame 2 and protrude outside the range of the clearance envelope 20, so that these corners 2a, 2b, Only 2d should be chamfered.

  Moreover, as shown in FIG. 4, depending on the centrifuge, for example, a duct 22 that is a protruding member may be disposed on the back side of the outer periphery of the frame 2 of the centrifuge body 1. In this case, since the outermost shell described above becomes the corner portions 22a and 22b of the duct 22, the corner portions 22a and 22b are placed on a circumference (here, φ1300 mm) in the horizontal direction centered on the gravity center position 21. Chamfer so that it fits.

  In this way, the shortest distance between, for example, the corner 22b of the duct 22 indicated by the wavy line (after movement or during movement) and the clearance envelope 20 is 50 mm and can be accommodated in the clearance envelope 20.

  Further, the chamfering of the outermost shell of the duct 22 can be performed as shown in FIG. That is, the corner 22a that is the outermost shell of the duct 22 is set to a distance r1 (for example, 650 mm) from the gravity center position 21 to the point A (first outermost shell) of the duct 22 and from the gravity center position 21 to the A of the duct 22. The relationship between the distance r2 (for example, 600 mm) and the point B (second outermost shell) located inside the point (first outermost shell) is such that r1> r2. As a result, the point B of the duct 22 passes the locus b inside the locus a of the point A.

  As described above, for example, when the duct 22 is disposed on the back side of the outer periphery of the frame 2, if the corner portion 22a serving as the outermost shell of the duct 22 is chamfered as described above, the outermost shell of the duct 22 is cleared. Of course, it is possible to fit in the envelope 20, and the clearance envelope 20 and the portion of the point 22 (second outermost shell) inside the point A (first outermost shell) of the duct 22 The shortest distance between them can be made larger than the above-mentioned 50 mm. In other words, the outer periphery of the duct 22 can be reliably stored in the clearance envelope 20.

  4 and 5 show the case where the duct 22 is provided on the back side of the frame 2, the duct 22 is not limited to the back side of the frame 2, and is provided on the left and right side surfaces. There is also.

  In this case as well, chamfering may be performed so as to fit on the circumference in the horizontal direction with the center of gravity 21 as the center. In this case, not only the corners of the duct 22 but also the corners of the frame 2 may be chamfered when the corners of the frame 2 protrude from the circumference in the horizontal direction. The chamfering of the outermost shell is not limited to a linear shape as shown in the figure, but may be a curved shape as described above, or a combined shape of a plurality of straight lines approximated to a circumferential shape. Of course, it may be.

  Further, when the gravity center position 21 is biased to the gravity center position 21a as shown in FIG. 3, the corners of the duct 22 are arranged so as to fit on the circumference in the horizontal direction around the gravity center position 21a as described above. The corners of the part and / or the frame 2 may be chamfered.

  Note that the diameter of the circumference in the horizontal direction around the center of gravity 21 is not limited to φ1100 mm shown in FIG. 2 or φ1300 mm shown in FIG. 4, and the circumference does not protrude from the clearance envelope 20. Any range is acceptable.

DESCRIPTION OF SYMBOLS 1 Centrifuge body 1a Axis 2 Frame 2a-2d, 22a, 22b Corner | angular part 3 Partition plate 4 Upper chamber 5 Lower chamber 6 Opening part 7 Cylindrical casing 8 Rotor chamber part 9 Opening part 10 Rotor chamber 11 Bowl 12 Foaming material 13 Evaporation Device 14 Rotor 15 Motor 16 Drive shaft 17 Anti-vibration rubber 18 Operation panel 19 Door 20 Clearance envelope 21, 21a Center of gravity position 22 Duct

Claims (7)

A centrifuge having a centrifuge body in which a rotor holding a sample to be separated and rotating at a high speed and a rotor chamber accommodating the rotor are accommodated in a frame,
A centrifuge having a chamfered corner portion of a projected shape viewed from directly above the centrifuge body.   The outermost shell of the frame in a direction orthogonal to the axis extending in the vertical direction from the center of gravity position of the centrifuge body is chamfered so as to fit on the circumference in the horizontal direction centered on the center of gravity position. The centrifuge according to claim 1. The centrifuge body is provided with a protruding member attached to the outer periphery of the frame,
The outermost shell of the projecting member in a direction orthogonal to the axis extending in the vertical direction from the center of gravity position of the centrifuge body is chamfered so as to fit on the circumference in the horizontal direction centered on the center of gravity position. The centrifuge according to claim 1, wherein:   The centrifuge according to claim 2 or 3, wherein the chamfer has a curved shape.   The centrifuge according to claim 2 or 3, wherein the chamfer has a linear shape.   The centrifuge according to claim 2 or 3, wherein the chamfer is a combined shape of a plurality of straight lines approximated to a circumferential shape. A centrifuge having a centrifuge body in which a rotor holding a sample to be separated and rotating at a high speed and a rotor chamber accommodating the rotor are accommodated in a frame,
The centrifuge body is provided with a protruding member attached to the outer periphery of the frame,
The outermost shell of the projecting member in a direction orthogonal to the axis extending in the vertical direction from the center of gravity position of the centrifuge body is chamfered so as to fit on the circumference in the horizontal direction centered on the center of gravity position. Become
In the chamfered state, a distance from the position of the center of gravity in the direction orthogonal to the axis to the first outermost shell of the protruding member is r1, and from the position of the center of gravity in the direction orthogonal to the axis The centrifuge characterized in that when the distance from the projecting member located inside the first outermost shell to the second outermost shell is r2, each relationship is r1> r2.

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