JPH08131896A - Centrifugal separating machine - Google Patents

Abstract

PURPOSE: To provide a centrifugal separating machine with which the recognition of a sample temp. having less errors is realized over a long period and the control of the sample temp. is exactly executed. CONSTITUTION: This centrifugal separating machine is provided with a temp. sensor 9 for detecting the temp. of a shaft end 10 of a motor for rotationally driving a rotor 2 and a temp. sensor 7 for detecting the temp. in a centrifugal chamber 1 where the rotor 2 rotates. The signals from both temp. sensors 7, 9 are taken into a CPU 6 via a temp. detecting circuit 8. Arithmetic processing by which the sample temp. is made into the function of the temp. at the end of the motor shaft and the temp. in the centrifugal chamber is executed in the CPU 6, by which the sample temp. during the centrifugal sepn. operation is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge, and more particularly to a centrifuge capable of accurately grasping a sample temperature during a centrifuging operation.

[0002]

2. Description of the Related Art Conventionally, centrifuges have been widely used to analyze sample components in the medical field and the like. Among these centrifuges, there are centrifuges configured so that a plurality of different types of rotors can be used by being changed according to the type and amount of the sample to be analyzed, the purpose of analysis and the like. In addition, since the centrifuge rotates the rotor containing the sample to be separated at high speed, the rotor is heated by frictional heat with the air in the centrifuge chamber, and the temperature of the sample contained in the rotor also rises. To do. for that reason,
Depending on the purpose of analysis, it may be necessary to suppress the rise in the sample temperature, and the centrifuge has some kind of cooling means to indirectly cool the rotor by cooling the inside of the centrifuge. There is also a centrifuge equipped with means for controlling the temperature of the sample contained therein within the temperature range desired by the user.

Here, in a centrifuge equipped with a means for controlling the sample temperature, it is necessary to accurately grasp the sample temperature for the control, but in reality, the sample temperature is stored inside the rotor rotating at high speed. Since it is difficult to directly detect the measured sample temperature, the correlation value between the sample temperature and the temperature inside the centrifuge chamber, which was previously detected by the CPU in advance simply by detecting the temperature inside the centrifuge chamber with a sensor, is conventionally used. In general, the temperature is controlled by using the corrected value and the corrected value is used.

[0004]

However, here,
The temperature rise of the rotor rotating at high speed is not only caused by the air friction in the centrifuge chamber, but the winding heat and bearing heat generated by the motor that actually drives the rotor to rotate from the end of the motor's rotating shaft to the rotor. There is also a large element that transmits and heats the rotor from the inner wall surface side. Moreover, the winding heat generation and the bearing heat generation of this motor are strictly different for each motor or each bearing, and it is difficult to manufacture a motor or a bearing having exactly the same amount of heat generation. There are different rotor heating elements. Even with the same centrifuge, the winding heat and bearing heat of the motor change due to the amount of sample to be separated, the imbalance of the sample, and the change over time, and the amount of heat given to the rotor is not a constant value. .

Here, changes in the winding heat generation and the bearing heat generation of the motor have a great influence on the change in the temperature rise of the rotor, and also have a significant effect on the temperature of the sample stored in the rotor, but in the centrifuge chamber. In many cases, it is not such that it causes a change in temperature. Therefore, trying to calculate the sample temperature from the detected value only from the temperature in the centrifuge chamber already contains a large error factor, and the error factor becomes larger year by year depending on the usage conditions and frequency of use. Even in a centrifuge equipped with a means for controlling the sample temperature, it was not possible to accurately control the sample temperature, and the control of the sample temperature was inaccurate.

The present invention has been made in view of the problem of the above-described conventional centrifuge having means for controlling the sample temperature, and its purpose is to grasp the sample temperature with a small error for a long time. It is an object of the present invention to provide a centrifuge which can be realized over a period of time and whose sample temperature can be accurately controlled.

[0007]

In order to achieve the above-mentioned object, the present invention provides a temperature sensor for detecting a shaft end temperature of a motor for rotationally driving a rotor and a temperature sensor for detecting a temperature in a centrifuge chamber in which the rotor rotates. A sensor is provided, and the signals from both the temperature sensors are sent to the CP through the temperature detection circuit.
In U, the CPU performs a calculation process in which the sample temperature is a function of the motor shaft end temperature and the centrifuge chamber temperature,
The centrifuge was designed to determine the sample temperature during the centrifugation operation.

[0008]

According to the centrifuge according to the present invention described above,
Not only the temperature inside the centrifuge chamber where the rotor is rotating, but also the end of the motor shaft that can detect winding heat generation and bearing heat generation of the motor that rotates the rotor that changes depending on the centrifuge, usage conditions, frequency of use, etc. Since the sample temperature is determined in consideration of the temperature as well, there is an effect that the sample temperature can be accurately grasped over a long period of time as a centrifugal separator.

[0009]

EXAMPLES The centrifuge according to the present invention described above will be described below with reference to examples.

Here, FIG. 1 is a view showing a conceptual configuration of a centrifuge according to the present invention, in which 1 is a centrifuge chamber and 2 is a centrifuge chamber. It is a rotor.

The rotor 2 is driven by a motor 3 and rotates at a high speed in the centrifuge chamber 1 to centrifuge the sample W stored in the rotor 2. Also,
The rotor 2 is indirectly cooled by the evaporator 4 wound around the outer wall of the centrifuge chamber 1, and is configured to suppress the temperature rise of the sample W stored in the rotor 2 during the centrifugation operation. ing.

Reference numeral 5 in the figure denotes the above-mentioned centrifuge chamber 1.
A compressor for condensing the refrigerant supplied to the evaporator 4 wound around the outer wall of the
The rotor 2 is indirectly cooled by supplying a refrigerant to the evaporator 4 in response to a command from the controller 6.

Reference numeral 7 is a temperature sensor for detecting the temperature in the centrifuge chamber 1, and the signal of the temperature sensor 7 is taken into the CPU 6 via a temperature detection circuit 8. Further, reference numeral 9 in the drawing denotes a temperature sensor for detecting the temperature of the rotary shaft end portion 10 of the motor 3 for rotationally driving the rotor 2, and the signal of the temperature sensor 9 also passes through the temperature detection circuit 8 and the CPU 6 Is taken into.

The installation position of the temperature sensor 9 for detecting the temperature of the rotary shaft end 10 of the motor 3 will be described with reference to FIG. 2. The temperature sensor 9 is an annular recess formed on the bottom surface of the rotary shaft end 10. (Height 6 mm, width 4 mm) The sensor part is inserted into 11 and fixedly installed on the bearing 12 of the motor 3 so that the ambient temperature near the end 10 of the rotating shaft can be detected. It is arranged.

In the CPU 6 which has taken in the data of the temperature inside the centrifuge chamber and the temperature at the end of the motor shaft from the temperature sensors 7 and 9, respectively, the sample temperature is calculated as a function of the temperature at the end of the motor shaft and the temperature inside the centrifuge chamber. The sample temperature is calculated and the sample temperature is calculated by the user.
3 is used to control the operation of the compressor 5 so as to match the desired sample temperature input to the CPU 6.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above,
It goes without saying that various modifications and changes can be made based on the technical idea of the present invention.

[0017]

As described above, according to the centrifuge according to the present invention described above, not only the temperature of the centrifuge chamber in which the rotor is rotating but also the temperature of each centrifuge, or the operating conditions, is used as the sample temperature during the centrifugation operation. , CP that considers the temperature at the shaft end of the motor that can detect the winding heat generation and bearing heat generation of the motor that rotates the rotor that changes depending on the frequency of use, etc.
Since it is automatically determined in U, it has the effect of becoming a centrifuge that can accurately grasp the sample temperature over a long period of time, and can be a centrifuge that can accurately control the sample temperature to the set temperature desired by the user. .

[Brief description of drawings]

FIG. 1 is a diagram showing a conceptual configuration of a centrifuge according to the present invention.

FIG. 2 is a conceptual cross-sectional view showing an installation position of a temperature sensor that detects a motor shaft end temperature.

[Explanation of symbols]

 1 Centrifuge Chamber 2 Rotor 3 Motor 4 Evaporator 5 Compressor 6 CPU 7 Temperature Sensor to Detect Temperature in Centrifuge Chamber 8 Temperature Detection Circuit 9 Temperature Sensor to Detect Motor Shaft End Temperature 10 Motor Rotating Shaft End 11 Rotating Shaft End Annular recess formed on the bottom surface of the part 12 bearing part of the motor 13 sample temperature setter W sample

Claims (1)

[Claims] 1. A temperature sensor for detecting a shaft end temperature of a motor for rotationally driving a rotor, and a temperature sensor for detecting a temperature of a centrifuge chamber in which the rotor rotates are provided, and signals from the both temperature sensors are detected by a temperature detection circuit. Through the CPU
In the CPU, the sample temperature is calculated as a function of the motor shaft end temperature and the centrifuge chamber temperature.
A centrifuge characterized by determining a sample temperature during a centrifugation operation.