JPS6236529Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the prevention of wind noise that occurs when the rotor of a centrifuge rotates at high speed.

As the rotor 1 rotates, the upper part A of the rotor 1
The air is blown away by centrifugal force in the direction of arrows B and C, and when part A becomes negative pressure, outside air is sucked in through hole 3 of door 2, which prevents heat generation due to friction between rotor 1 and air. In centrifuges, the rotor 1 that rotates at high speed has traditionally been covered with a rotor cover (not shown). However, when completing centrifugation at high speed and in a short period of time, it takes time and effort to remove the rotor cover, and the rotor cover is also required to cool the sample in the tube directly with the outside air and prevent the sample from rising in temperature. An unused rotor is preferable. In recent years, high-speed microcentrifuges and the like that separate small amounts of samples in a short time, which have been particularly in demand, often cannot accommodate as many samples as the four tube holes in the rotor 1 in one centrifugation. For this reason, centrifugation is performed without all the tubes entering the tube hole 4. In this case, when air introduced from the outside passes over the tube hole 4 in which the tube is not inserted, a whistle-like wind noise is generated.

An object of the present invention is to provide a quiet centrifuge that eliminates the above-mentioned wind noise.

The present invention focuses on the fact that wind noise is generated by the flow of air above the rotor, and devises the structure of the upper part of the rotor to change the flow of air above the rotor.

In this invention, the air above the rotor 1 rotates in the same direction as the rotor 1 and is blown in the direction of arrows B to C, and because the rotation speed of the air is slower than the rotation speed of the rotor 1, the whistle-like wind is generated. Since it seems that cutting noise is generated, a protrusion as shown in FIG. 2 is provided between the tube holes 4 of the rotor 1. It is sufficient if the height of the protrusion is about 2 mm, and if it is more than that, the load on the motor will only increase. Also, the length of the protrusion should be four or more tube holes. FIG. 3 shows an example for easily implementing the protrusions shown in FIG. 2, in which a press-formed partition plate 5 is attached to the upper part of the rotor, which is machined without protrusions, and is tightened with a nut that fixes the rotor. This is designed to have the same effect as in Figure 2.

According to the present invention, by providing the protrusions between the tube holes 4 of the rotor 1, the air flowing above the tube holes 4 becomes turbulent, which eliminates the whistling wind that would occur when the protrusions were not provided. It can eliminate the cutting sound.

Also, the number of tubes used for one centrifugation is
Quiet centrifugation is possible even when the number of tube holes is smaller than the number of tube holes in the rotor, or quiet centrifugation is possible without interfering with the effect of preventing the temperature rise of the sample by providing a rotor cover.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an air-cooled centrifuge, FIG. 2 is a perspective view of the rotor of the present invention, and FIG. 3 is a perspective view showing an example of implementing the present invention. 1 is a rotor, 2 is a door, 3 is a hole, 4 is a tube hole, and 5 is a partition plate.

Claims (1)

[Scope of utility model registration request] In an air-cooled centrifuge that introduces outside air into the rotor chamber as the rotor rotates and prevents heat generation due to friction between the rotor and the air, a low protrusion is provided between the tube holes of the rotor. Features of rotor for centrifuges.