JPH09983A - Centrifuge - Google Patents

Abstract

PURPOSE: To directly heat a rotor by induction heating utilizing a magnetic field with respect to a heater for controlling temperature of rotors in vacuum such as a centrifugal separator and a centrifugal concentrator. CONSTITUTION: Electromagnets or magnets 11 are arranged around a rotor 1 and the rotor 1 is rotated in a magnetic field or a changing magnetic field generated from these, allowing the rotor 1 to be heated by using induction heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultracentrifuge or a centrifugal concentrator for evaporating and concentrating a solvent in a sample by pressurizing a sample in a rotating body and depressurizing and heating while suppressing rapid sample boiling. The present invention relates to a heating device for controlling the temperature of a rotating body that rotates in a vacuum or reduced pressure container.

[0002]

2. Description of the Related Art Ultracentrifugal separators and centrifugal concentrators using conventional techniques are radiantly heated by winding a heating wire or the like around a rotating chamber surrounding a rotating body and heating the rotating chamber wall as shown in FIG. Was going on. In addition, in a centrifugal concentrator which requires a large amount of heat, X
A method of irradiating the rotating body with light from the outside of the rotating chamber with a lamp such as e to heat the rotating body has also been used.

[0003]

In the prior art, radiant heating was used to heat the rotating body. Radiant heating can send the amount of heat in proportion to the four difference of the temperature difference,
Increasing the temperature of the wall of the rotating chamber to a high temperature was not normally performed because it also affects the cooling devices and sensors attached to the rotating chamber. Therefore, a large difference in temperature between the rotating body or the sample and the wall of the rotating chamber cannot be secured, and the amount of heat applied to the rotating body becomes small, which raises a problem of increasing the temperature of the rotating body or maintaining the high temperature. That is, it is due to the low efficiency of radiant heating, and if the rotating chamber is designed to withstand high temperatures, it will become expensive, and if the vacuum degree is lowered, it will be considerably affected by friction between the rotating body and air. Although it is possible to generate a large amount of heat, the amount of heat generated cannot be controlled, and the motor that drives the rotating body is subject to a heavy load, so the motor specifications must be high and the cost becomes high. There was a problem that it would end up.

The object of the present invention is to work by directly heating the rotor by induction heating utilizing a magnetic field in a device for controlling the temperature of the rotor in vacuum such as an ultracentrifuge or a centrifugal concentrator. It is to improve efficiency.

[0005]

In order to solve the above problems, it is achieved by paying attention to the fact that the rotating body is usually metallic and arranging a local magnetic field or a varying magnetic field around the rotating body.

[0006]

The ultracentrifuge and the centrifugal concentrator configured as described above generate an eddy current in the rotor metal due to a local magnetic field or a fluctuating magnetic field arranged around the rotor, and its loss.
(Joule heat) acts to directly heat the rotating body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating apparatus according to the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. The rotating body 1 in which the sample 2 is inserted in FIG. 1 is rotated at a high speed by the driving device 4 in the rotating chamber 3 which is an inner container. A protector 6 is provided on the outer circumference of the rotary chamber 3 to prevent the scattering of fragments when the rotary body 1 is broken. Further, the high speed rotation of the rotary body 1 prevents the heat from being generated due to friction with air. As described above, the vacuum container 7 including three members for maintaining the vacuum is provided.
The opening of the vacuum container 7 is covered with a door 8 which is a vacuum container lid, so that the vacuum pump 9 evacuates. A temperature control device for controlling the temperature of the rotating body 1 is provided in the rotating chamber 3, and a cooling device 5 and one or more electromagnets 10 or magnets 11 for heating are arranged. In the case of the structure using the electromagnet 10, as shown in FIG.
An electric current flows through the electromagnet 10 arranged below when the rotating body 1 needs to be heated. The magnetic field generated from the electromagnet 10 generates an eddy current in the metallic rotating body, and the rotating body 1 can be directly heated by the Joule heat without contact. Since the rotating body 1 is rotating at high speed,
Although Joule heat is generated simply by generating a magnetic field, a larger amount of heat can be obtained by switching the current input or changing the current input. When the magnet 11 is used, the amount of heat generation can be changed by changing the distance between the magnet 11 and the rotating body 1 as shown in FIG. Further, an open / close type magnetic shield plate 12 is provided between the magnet 11 and the rotating body 1.
The same effect can be obtained by arranging.

[0008]

According to the present invention, since the rotating body can be heated in a non-contact manner by using the magnetic field, the working efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an ultracentrifuge according to the present invention.

FIG. 2 is a partially enlarged configuration diagram showing an ultracentrifuge according to the present invention.

FIG. 3 is a configuration diagram showing a conventional ultracentrifuge.

[Explanation of symbols]

1 is a rotating body, 2 is a sample, 3 is a rotating chamber, 4 is a driving device, 5
Is a cooling device, 6 is a protector, 7 is a vacuum container, 8 is a door, 9 is a vacuum pump, 10 is an electromagnet, 11 is a magnet, and 12
Is a magnetic shield, 13 is a heating wire, and 14 is a Xe lamp.

Claims (1)

[Claims] 1. A centrifuge comprising a rotating body rotated by a motor, a rotating chamber accommodating the rotating body, and a temperature control device capable of heating or cooling the rotating chamber, the rotating body comprising: The centrifuge characterized in that the heating is performed by induction heating with a magnetic field.