JPH04277048A - Centrifuge - Google Patents

Abstract

PURPOSE:To make the surface area of a radiator large, lessen the number of components and the joining parts of the components, and provide a highly efficient, economical, and reliable centrifuge which has a cooling apparatus using a thermo-module. CONSTITUTION:A plate 17b of a radiator 17 is made to have a function of a conventional lower plate 7 and it is extruded to the outside of a cylinder sidewall 6 to form a bottom plate which, together with a cylinder bottom wall 6, composes a rotor chamber.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge cooled by a thermo module.

0002

[Prior Art] As a centrifuge that is cooled by a thermo module that utilizes the Peltier effect, for example,
There are No. 18464, Special Publication No. 61-502016, etc.
As a structure of a cooling-related part, the one shown in FIG. 6 is known. In the figure, reference numeral 3 denotes a heat radiator for radiating heat absorbed from the bowl 2 by the thermo module 1. For clarity, FIG. 7 shows a perspective view of only the heat radiator 3 taken out and placed upside down. The radiator 3 is the door 4,
The upper plate 5, the cylindrical side wall 6, the lower plate 7, etc. are assembled together with bolts 14 so as to form a vacuum chamber, that is, a rotor chamber 15 as a whole. Further, a cylindrical protector 9 is installed inside the cylindrical side wall 6 to prevent the rotor 8 from scattering to the outside in the event that the rotor 8 is broken. The heat radiator 3 is attached to the lower protector 7 inside the protector 9 with an O-ring 10, a washer 11, a spring washer 12, and a bolt 13.

0003

SUMMARY OF THE INVENTION This conventional structure has the following drawbacks.

1. The outer diameter of the heat sink 3 cannot be made larger than the inner diameter of the protector 9 due to the mounting structure.
It is difficult to increase the surface area of the air side of the radiator 3. 2. Since the heat radiator 3 and the lower plate 7 are separate parts, it is difficult to effectively use the lower plate 7 as a heat radiator. 3. Also, since these parts are separate parts, a washer 11 for attaching the radiator 3 to the lower plate 7 is required.
, spring washers 12, bolts 13, and other parts are required, which increases the number of parts and the number of assembly steps. 4. Since the heat radiator 3 and the lower plate 7 are separate parts, there is an increased risk of vacuum or sample leakage at the joint, which is unfavorable in terms of reliability.

The object of the present invention is to eliminate these drawbacks and
The surface area of the heatsink can be increased, and the part corresponding to the conventional lower plate can be used as a heatsink.
The aim is to provide a high-performance, low-cost, and highly reliable centrifuge by reducing the number of parts and reducing the number of locations where there is a risk of vacuum or sample leakage.

[0006]

[Means for Solving the Problems] The above object is to provide a centrifuge in which a radiator and a lower plate are integrated to form a bottom plate, and the bottom plate extends to the outside of a cylindrical side wall to form a rotor chamber. This is achieved by

[0007]

[Function] This configuration has the following effects.

1. Since the heat radiator can be expanded to the lower part of the protector 9 and the cylindrical side wall 6, the heat radiation area can be made sufficiently large as required. 2. It can also serve the function of the conventional lower plate 7, which is an element for forming the bottom plate, and the heat radiation area can be increased. 3. By integrating the heat sink and the lower plate 7, parts for joining them together and man-hours for assembling them become unnecessary. 4. By integrating the same parts, it is possible to reduce the number of locations where there is a risk of vacuum or sample leakage.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a diagram showing an embodiment of the present invention corresponding to FIG. 6 above. In FIG. 1, the same reference numerals as in FIG. 6 indicate parts having similar functions. 16 is a motor that rotates the rotor 8 at high speed, and 17 is a radiator for dissipating heat from the thermo module 1, which is composed of fins 17a and a plate 17b extending to the outside of the cylindrical side wall 6. Note that a cooling blower for air cooling the fins 17a is not shown because it would be complicated.

[0011] Next, an outline of the centrifuge will be described, and then the present invention will be explained in detail with reference to examples. A sample to be separated or purified is put into the rotor 8, and the rotor 8 is connected to the motor 16.
Rotate at. At this time, the inside of the vacuum chamber 15 that forms the rotor chamber of the present invention around the rotor 8 is evacuated by a vacuum pump (not shown), but heat generation due to friction on the surface of the rotor 8 due to a small amount of residual air and transmission from the motor 16 are eliminated. The temperature of the rotor 8 increases due to the heat, and there is a possibility that the quality of the sample may change. To prevent this, the thermo module 1
Heat is removed from the bowl 2 surrounding the rotor 8, the bowl 2 is made low temperature, and the rotor 8 is cooled mainly by heat radiation. A radiator 1 for dissipating the heat taken from the bowl 2 and the electric energy for operating the thermo module 1 at that time.
7 is required.

The feature of the first embodiment of the present invention is that the heat radiator 17 is cast from aluminum, and the plate 17b of the heat radiator 17 extends to the outside of the cylindrical side wall 6. For ease of understanding, FIG. 2 shows a perspective view of only the heat radiator 17 upside down.

By integrally molding the portion corresponding to the conventional lower plate 7 with the plate 17b of the heat sink 17 and providing the fins 17a on the back side, the fin surface area can be made sufficiently large, and the conventional O-ring 10, Since parts such as the washer 11, spring washer 12, and bolt 13 are no longer necessary, a centrifuge with higher performance and lower cost can be achieved. In addition, since there is no longer a joint between the conventional heat sink 3 and the lower plate 7, there is no risk of leakage from this part.
A more reliable centrifuge can be provided.

Next, a second embodiment of the present invention will be explained with reference to FIG. This figure is a perspective view corresponding to FIG. 2. The heat sink 17 shown in FIG. 3 is made by integrally manufacturing fins 17a and plates 17b by extrusion molding aluminum. By manufacturing the heat radiator 17 by extrusion molding in this manner, the heat radiator 17 has fewer internal cavities and less risk of leakage of vacuum, etc., and is more reliable than by casting. In addition, since mass production is better than casting, the radiator 17 can be manufactured at a low cost by extruding a large amount of extrusion molded products at once and cutting them.

Next, a third embodiment of the present invention will be explained with reference to FIGS. 4 and 5. FIG. 4 is a perspective view corresponding to FIG. 2. Figure 4
The heat radiator 17 shown in FIG. 5 is made by joining the fins 17a shown in FIG. 5 made of aluminum by extrusion molding and the plate 17b made of an aluminum plate. Note that, as a method of joining these, a high-performance heat sink 17 can be obtained by screwing them together with grease having good thermal conductivity interposed therebetween. Furthermore, by using a highly thermally conductive adhesive instead of screwing, the number of assembly steps can be reduced and costs can be reduced.

By manufacturing the fin 17a portion and the plate 17b portion separately in this way, whereas the first and second embodiments required dedicated molds, the fin 17a portion and the plate 17b portion are manufactured separately. For the part, it is possible to use a general-purpose material that is generally commercially available as a fin material for a heat sink. This eliminates the need for expensive dedicated molds and allows for low-cost manufacturing.

[0017]

[Effects of the Invention] According to the present invention, the heat dissipation area can be sufficiently large, resulting in high performance, the number of parts can be reduced, so the cost can be reduced, and the number of points where there is a risk of leakage can be reduced, so the centrifugal system can be highly reliable. machine can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the essential parts of a centrifuge according to the present invention.

FIG. 2 is a perspective view showing the heat sink of FIG. 1;

FIG. 3 is a perspective view showing another embodiment of the heat radiator.

FIG. 4 is a perspective view showing another embodiment of the radiator.

FIG. 5 is a perspective view showing the heat dissipation fin of FIG. 4;

FIG. 6 is a longitudinal sectional view showing an example of a conventional centrifuge.

FIG. 7 is a perspective view showing an example of a conventional heat radiator.

[Explanation of symbols] 1 is a thermo module, 6 is a cylindrical side wall, 15 is a vacuum chamber (
17 is a radiator, 17a is a fin, and 17b is a preplate.

Claims (1)

[Claims] Claim 1: A centrifugal machine comprising a thermo module provided below a rotor chamber in which a rotor rotates at high speed, the rotor being cooled by the thermo module, wherein the centrifuge is provided with a cylindrical side wall and a bottom of the cylindrical side wall. A centrifuge characterized in that a rotor chamber is constituted by a bottom plate extending to the outside of a cylindrical side wall, and the bottom plate is formed by a radiator.