JPH09141138A - Electronic cooling part structure of ultra-centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the radiation surface of a Peltier element by a small and simple radiation fin shape, by forming a plate being in contact with the Peltier element from a material high in heat conductivity and providing a radiator at a position separated from the Peltier element. SOLUTION: In a centrifugal separator used in a biochemical or medical field, a rotary body 2 housing a sample 1 is rotated within the cooling container 5 in a vacuum container 4 at a high speed by a drive motor 3 and a plurality of Peltier elements 6 are arranged to the periphery of the rotary shaft of the drive motor 3 so as to be positioned under the cooling container, the rotary body or the like. The cooling surfaces of the elements 6 are in contact with the cooling container 5 and the radiant surfaces thereof are in contact with a bottom plate 4b. A radiator 7 is attached to the bottom plate 4b on the side of the atmosphere and surrounded from the outside by a blow duct 8 to be cooled by a fan 9. At this time, the bottom plate 4b is composed of aluminum inexpensive as a heat conductor and the radiator of an extrusion material can be employed as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat dissipating structure for an electronic cooling unit in a device such as a centrifuge that needs to keep the temperature of a rotating body constant.

[0002]

2. Description of the Related Art Centrifuges used in the fields of biochemistry and medicine generally have a cooling device for keeping a sample temperature constant. There is one that uses a Peltier element as one of the cooling devices, and these generally have a Peltier element placed on a radiator and a cooling container placed on the radiator to intermittently supply current to the Peltier element or The temperature of the cooling container was kept constant by controlling the supply current and inverting the polarity.

[0003]

As shown in FIGS. 3 to 6, the airframe and the rotating chamber of the conventional ultracentrifuge for separation may be equipped with a plurality of radiators and radiator fans having a large radiator system volume. did it. Moreover, since the rotating body is larger and the heat dissipation capacity is higher than that of the small ultracentrifuge, there has been no demand for the temperature of the cooling container to be so low. In recent years, in small ultracentrifuges that are becoming mainstream, the size of the cooling container and the rotating body that make up the rotating chamber has been reduced to less than half of the conventional size, and the rotating body using radiant heat in vacuum is used. Was being cooled and heated. In an ultracentrifuge that performs such temperature control, miniaturization of the rotating body leads to a decrease in the surface area of the rotating body, and as a result, the heat dissipation capacity of the rotating body, which is the object to be cooled during cooling, is significantly reduced. I had done it. In order to compensate for this, it is required to maintain the cooling container at a lower temperature than before, but when using electronic cooling, increase the input to the element or lower the heat radiation side temperature to lower the temperature of the cooling surface. There was no other way. However, if the element input is increased, the increased amount of exhaust heat will result in a load on the heat dissipation capacity, and even if the temperature on the heat dissipation side is lowered, forced air cooling will cause a decrease in space inside the machine, ventilation, noise, etc. There was a limit because of the problem. In the conventional small ultracentrifuge, the bottom plate is sandwiched between the Peltier element and the radiator is arranged as shown in FIG. 5 and FIG. The radiator is directly formed on the bottom plate to obtain the cooling capacity.
However, this method has the following problems. Due to the downsizing of the cooling container, the Peltier element must be installed near the rotation axis of the drive unit. Therefore, even if an inexpensive extrusion material heat radiation fin is used, the radiator section directly below the Peltier element is driven as shown in FIG. It was expensive because it required cutting to avoid parts. In addition, the above-described integral molding of the bottom plate and the radiator has been costly because it is a cutting process or is a casting that requires an expensive mold. Furthermore, even if the cooling surface of the Peltier element and the cooling container are connected by a high-heat electric body such as aluminum and a radiator is installed directly under the Peltier element so that it does not interfere with the drive unit, the vacuum container and protector become large, and the main body In addition to the reduction in size, the volume of the vacuum container is increased, so that it is necessary to improve the capacity of the vacuum pump and the like, leading to an increase in cost. As described above, in the method of mounting the radiator directly below the Peltier element, a complicated deformed air passage with the central portion separated by the drive portion causes a high air passage resistance or an unbalanced air passage resistance, which causes a blower fan. Of the air duct, increase of noise, and the cost of the air duct due to the countermeasures. In addition, although there are some that do not use a ventilation duct, it is necessary to strengthen the ventilation fan because the exhaust heat of the drive unit enters the radiator side and reduces the heat radiation efficiency.

An object of the present invention is to provide an inexpensive heat dissipating portion structure capable of keeping the heat dissipating surface of a Peltier element at a low temperature by using a small and simple heat dissipating fin shape.

[0005]

SUMMARY OF THE INVENTION The above object is to provide a member of the bottom surface of a vacuum container with a material having a high thermal conductivity, such as aluminum, so as to impart the ability as a heat transfer medium, and to use a Peltier heat radiator. This can be achieved by installing the element on the heat dissipation surface of the element other than directly below. More specifically, since the bottom member of the vacuum container is made of a heat conductor, and a radiator is not installed near the drive unit immediately below the rotation chamber that covers the space limitation directly below the heat dissipation surface of the Peltier element, the heat dissipation efficiency is good and the blower fan It is possible to obtain an inexpensive heat dissipation system with low noise.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the electronic cooling unit structure according to the present invention will be described with reference to FIGS. The rotating body 2 containing the sample 1 is rotated at a high speed in the rotating chamber in the vacuum container 4 by the drive motor 3. The rotation chamber is composed of a door 4 a that constitutes the vacuum container 4 and a cooling container 5. Below the cooling container 5 are a plurality of Peltier elements 6 arranged around the rotation axis of the drive motor 3, the cooling surface of which constitutes the cooling container 5, and the opposite heat exhaust surface thereof constitutes the bottom of the vacuum container 4. It is in contact with the bottom plate 4b which is a plate. A radiator 7 is attached to the atmosphere side of the bottom plate 4b, and a ventilation duct 8 surrounds the outside thereof to cool the radiator 7 with a fan 9.

Here, in order to cool the rotating body 2, when a current is applied to the Peltier element 6 to cool the cooling container 5, all of the input becomes Joule heat, which is generated on the heat exhaust surface side of the Peltier element 6 together with the cooled heat amount. . The generated heat passes through the bottom plate 4b as a heat conductor and is radiated to the outside by the cooling air sent from the radiator 7 by the fan 9. By using the bottom plate 4b as a heat conductor, the radiator 7 and the air duct 8 do not need to have a complicated shape avoiding the drive motor 3, and an inexpensive aluminum radiator or extruded radiator can be used as it is. Become. Further, the linear structure of the radiator makes the structure of the cooling blower duct easy and inexpensive, and since the imbalance due to the airflow resistance is unlikely to occur, noise can be reduced.

[0008]

According to the present invention, by using one member of the vacuum container as a heat conductor, a radiator is installed in the vicinity of the drive unit directly below the Peltier element heat radiation surface and directly below the rotating chamber where there are many spatial restrictions. If this is not done, there is no design restriction to avoid the drive section, and a simple shape and inexpensive extruding member fins of aluminum or the like can be adopted, so that cutting of the fin section becomes unnecessary. In addition, since the radiator does not have a structure that avoids the drive part, the cooling air passage can be a simple straight line and the resistance of the air passage can be lowered. A small and low noise product with low noise can be used. In terms of cooling efficiency, the thermal resistance increases because the distance between the Peltier element and the radiator increases, but the efficiency of the radiator improves, resulting in a decrease in the temperature of the Peltier element radiator surface, improving overall cooling efficiency. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an electronic cooling unit structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional side view showing a conventional cooling structure.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a vertical sectional side view showing a cooling structure of a conventional miniaturized ultracentrifuge.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 is a sample, 2 is a rotating body, 3 is a drive motor, 4 is a vacuum vessel, 4a is a one-piece door of a vacuum vessel, 4b is a one-piece bottom plate of a vacuum vessel, 5 is a cooling vessel, 6 is a Peltier element, and 7 is A radiator, 8 is a ventilation duct, 9 is a fan, and 10 is a protector.

Claims (4)

[Claims] 1. A rotating body that is driven to rotate by a motor, a cooling container that houses the rotating body, a Peltier element for cooling the cooling container, a plate that is in contact with the Peltier element, and a plate In the electronic cooling unit structure of an ultracentrifuge having a heat radiator provided, the plate is made of a material having high thermal conductivity,
An electronic cooling unit structure of an ultracentrifuge, wherein the radiator is provided at a position apart from the Peltier element. 2. The electronic cooling unit structure for an ultracentrifuge according to claim 1, wherein the plate is made of aluminum. 3. The heat radiator is provided at a position other than directly under the Peltier device.
Electronic cooling unit structure of the described ultracentrifuge. 4. The electronic cooling unit structure for an ultracentrifuge according to claim 1, wherein the radiator is provided only on one side of the rotating shaft of the rotating body.