JP2003275621A - Air cooling type centrifugal separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cooling type centrifugal separator capable of suppressing noise by a simple structure. <P>SOLUTION: In the air cooling type centrifugal separator wherein an air intake hole 29 is bored in a lid 23 and the open air is sucked in a centrifugal chamber 13 from the air intake hole 29 by the negative pressure generated by the rotation of a rotor 22 and the centrifugal chamber 13 is cooled by the open air, a conical shield member 28 is arranged to the center part of the air intake hole 29 and the leading end 28a thereof is allowed to face the interior of the centrifugal chamber 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooled centrifuge, and more particularly to an air-cooled centrifuge that takes in outside air by utilizing a negative pressure generated by rotation of a rotor to cool a centrifuge chamber. is there.

[0002]

2. Description of the Related Art In a centrifuge, a rotor is rotated at a high speed, so that the rotor rubs against air in a centrifuge chamber and a motor, which is a power source of the rotor, is heated, so that heat is transferred to the rotor. This causes the temperature in the centrifuge chamber to rise. Such a temperature rise in the centrifuge chamber may denature a sample such as blood. Therefore, as a simple cooling means for preventing the temperature of the centrifuge chamber from rising, as shown in FIG. 2, an air intake hole 2 is formed in a central portion of a lid 1 and a lower portion of a side wall 4 defining a centrifuge chamber 3 is formed. An air exhaust hole 5 is formed in the air outlet 5, and an exhaust port 7 formed in the hole 5 and the body case 6
The centrifugal chamber 3 is communicated with the outside through the air, and by utilizing the negative pressure generated in the central portion of the rotor 8 as the rotor 8 rotates, the outside air is taken into the centrifugal chamber 3 from the air intake hole 2 and the outside air is removed. There is provided a structure in which air is discharged through the air discharge hole 5 and the exhaust port 7, thereby cooling the inside of the centrifugal chamber 3.

[0003]

By the way, in the above air-cooled centrifugal separator, when the outside air is sucked into the centrifugal chamber 3 from the air intake hole 2 of the lid 1 as the rotor 8 rotates,
Air noise is generated. This noise increases as the rotation speed of the rotor 8 increases. Such noise is not preferable especially in a quiet hospital.

Therefore, an object of the present invention is to provide an air-cooled centrifuge capable of suppressing noise with a simple structure.

[0005]

[Means for Solving the Problems] In a pneumatic centrifuge,
It has been confirmed that the smaller the diameter of the air intake hole, the smaller the noise, but if the diameter of the air intake hole is small, it is not possible to take in a sufficient amount of outside air. Therefore, the inventor conducted an experiment by forming air intake holes of various shapes in order to take in a sufficient amount of outside air and reduce noise, and as a result, increased the diameter of the air intake holes. Also, noise is reduced by closing the center of the hole with a shielding member having a specific shape and guiding the outside air into the centrifuge chamber by an air passage defined between the shielding member and the air intake hole. I found that I can.

That is, in the air-cooled centrifuge of claim 1 according to the present invention, an air intake hole is opened in the lid, and the negative pressure generated by the rotation of the rotor sucks the outside air into the centrifugal chamber from the air intake hole. In the air-cooled centrifuge that cools the centrifuge chamber by the outside air, a cone-shaped shielding member is arranged at the center of the air intake hole and its tip is exposed to the centrifuge chamber. In this case, the outside air is guided by the conical surface of the shielding member, and the outside air can be introduced into the centrifuge chamber more smoothly. Further, by disposing the tip of the shielding member close to the upper surface of the central portion of the rotor, it is possible to prevent the rotor from falling off the drive shaft.

Further, in the air-cooled centrifuge according to claim 2 of the present invention, the lid is composed of an upper plate and a lower plate in a double structure, and the air intake hole is formed in the lower plate. The shielding member is installed in. In this case, the upper plate on which the shielding member is erected and the lower plate on which the air intake hole is formed are separately formed, and the upper plate is formed with the tip end of the shielding member facing the air intake hole and with an interval. The lower plate and the lower plate can be integrated to form a lid, and the air intake section can be easily configured.

[0008]

1 is a conceptual sectional view showing an embodiment of an air-cooled centrifuge according to the present invention.

In this centrifuge 10, the main body case 11
A centrifuge chamber 13 having an opening 12 is formed in the upper part of the. An air passage 15 is formed on the outer periphery of the lower portion of the side wall 14 that defines the centrifugal chamber 13. Further, one or a plurality of air discharge holes 16 are formed in the lower portion of the side wall 14, and an exhaust port 18 is also formed in the side wall 17 of the main body case 11. It communicates with the outside through the passage 15 and the exhaust port 18.

A motor 19 is arranged below the centrifugal chamber 13, and the motor 19 is installed in the main body case 11 via an elastic member 21 having a flange 20 made of rubber or the like. The tip of the drive shaft 19a of the motor 19 penetrates through the bottom of the centrifuge chamber 13 and projects into the centrifuge chamber 13, and a rotor 22 is installed at the tip thereof.

In this centrifugal separator 10, the lid 23 for closing the opening 12 of the main body case 11 has a hinge 24.
It is installed so that it can be opened and closed. On the other hand, body case 1
A gasket 25 is installed on the periphery of the opening 12 of No. 1, and when the lid 23 covers the opening 12, the gasket 25 seals between the lid 23 and the periphery of the opening 12 of the main body case 11.

The lid 23 is formed by an upper plate 26 and a lower plate 27. A cone-shaped shield member 28 is provided upright in the center of the upper plate 26, and an air intake hole 29 is formed in the center of the lower plate 27. Then, the upper plate 26 and the lower plate 27 are integrated so that the tip end portion 28a of the shielding member 28 penetrates through the center of the air intake hole 29 and is overlapped with each other with an appropriate gap 30. In that case,
The gap 30 is closed on three sides by the side walls of the upper plate 26 or the lower plate 27, and only one of them is opened to the outside to form an intake port 31. An annular padding portion 32 is formed on the peripheral surface of the air intake hole 29 of the lower plate 27 on the upper plate 26 side in order to smooth the air flow.

In the centrifuge 10 thus constructed, when the rotor 22 is rotated with the lid 23 closing the opening 12 of the body case 11, the lid 23 is rotated by the negative pressure generated by the rotation of the rotor 22. The outside air is introduced into the gap 30 from the intake port 31, and is further introduced into the centrifugal chamber 13 through the annular ventilation path 33 defined by the air intake hole 29 and the conical shielding member 28. Then, the outside air introduced into the centrifuge chamber 13 is discharged from the air discharge hole 16 to the ventilation path 15 and further discharged from the exhaust port 18 to the outside.

In the above embodiment, the shielding member 28 is used.
Is a circular shape whose horizontal cross-sectional area becomes smaller toward the tip, and the vertical cross-section outline is formed by a concave curve. The shielding member 28 according to the present invention is
The horizontal cross-sectional area may be a circular shape that decreases toward the tip, and the vertical cross-section outline may be formed as a convex curve. In the present invention, a shape in which the horizontal cross section has a smaller area toward the tip is called a cone. Further, the area of the annular ventilation passage 33 defined by the air intake hole 29 and the shielding member 28 needs to be at least large enough to take in air. However, if the area of the ventilation passage 33 is too large, noise is generated, and if the area of the ventilation passage 33 is too small, the outside air cannot be sufficiently introduced into the centrifugal chamber 13. Therefore, it is preferable that the outer diameter of the shielding member 28 is 25 to 75% of the diameter of the air intake hole 29 on the same cross section as the air intake hole 29.

[0015]

According to the air-cooled centrifuge of the first aspect of the present invention, since the outside air is guided more smoothly to the centrifuge chamber by the conical surface of the shielding member, noise is reduced with a simple structure. be able to. Further, by disposing the tip of the shielding member close to the upper surface of the central portion of the rotor, it is possible to prevent the rotor from falling off the drive shaft.

According to the air-cooled centrifuge of the second aspect of the present invention, the upper plate on which the shielding member is erected and the lower plate on which the air intake hole is formed are separately formed, and the tip of the shielding member is formed. The lid can be formed by integrally forming the upper plate and the lower plate with the space facing the air intake hole, and the air intake part can be easily configured.

[Brief description of drawings]

FIG. 1 is a conceptual sectional view showing an embodiment of an air-cooled centrifuge according to the present invention.

FIG. 2 is a sectional view conceptually showing a conventional air-cooled centrifuge.

[Explanation of symbols]

10 Centrifuge 11 body case 12 openings 13 Centrifuge chamber 14 Side wall 15 air passage 16 Air discharge hole 17 Side wall 18 Exhaust port 19 motor 19a drive shaft 20 flange 21 Elastic member 22 rotor 23 lid 24 hinges 25 gasket 26 Upper plate 27 Lower plate 28 Shielding member 28a Tip 29 Air intake hole 30 gap 31 Inlet 32 bulge 33 air passage

Claims (2)

[Claims] 1. An air-cooled centrifuge in which an air intake hole is opened in a lid, the negative air generated by the rotation of the rotor sucks the outside air into the centrifuge chamber, and the inside air is cooled by the outside air. 2. The air-cooled centrifuge, wherein a cone-shaped shield member is arranged at the center of the air intake hole, and the tip of the shield member faces the centrifuge chamber. 2. The cover is doubled by an upper plate and a lower plate, the air intake hole is formed in the lower plate, and the shielding member is installed in the upper plate. The air-cooled centrifuge described in.