JP2008302280A - Centrifugal separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal separator in which the current consumption of a driving power source (control power source) is reduced to reduce electricity consumption and the driving power source is made compact. <P>SOLUTION: In a control circuit device 8, the current consumption of the driving power source Vcc2 is reduced by stopping feeding of prescribed current Ifan to a blower (DC motor) 6 from the driving power source Vcc2 when the DC motor of a door lock meas 5 is driven and feeding the prescribed current Ifan to the blower 6 after the driving of the door lock means 5 is finished. Since the maximum current of the driving power source Vcc2 for driving the door lock means 5 and the blower 6 is suppressed to the peak value Imot of the starting current of the door lock means 5 by this way, the composite peak value of the current (im) of the door lock means 5 and the current (if) of the blower 6 is suppressed to the value Imot or lower. As a result, the commercial frequency transformer or the series regulator circuit of the driving power source can be made compact. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a centrifuge provided with a door lock device for locking a door, which can be freely opened and closed at an opening of a rotor chamber, in particular, reducing current consumption when driving the door lock device. Related to the centrifuge.

  In the centrifuge, the rotor that holds the material to be centrifuged is designed so that debris and the like do not scatter from the rotor chamber of the centrifuge body to the outside of the body even if it is broken or detached. In addition, a door lock mechanism for holding the door in a closed state is provided for the rotor of the centrifuge or the door provided in the rotor chamber opening for taking in and out the sample, and the operator erroneously touches the rotating rotor. Designed to be safe.

  When the start switch of the operation panel unit having the display unit is turned on, the control device for the centrifuge drives the door lock mechanism to drive the drive unit after the door is locked to accelerate the rotor. When the rotor reaches the set rotational speed input from the operation panel unit, the rotor is controlled at a constant rotational speed. Then, when the stop switch of the operation panel unit is turned on, the rotor is decelerated and stopped. When the controller recognizes that the rotor has stopped, it drives the door lock mechanism to release the door lock.

  A drive control unit, a drive power source (hereinafter also referred to as a control power source), a drive unit, and the like provided in the control device are power consumption units, and heat generated by the loss of the power consumption unit needs to be air-cooled by a blower. The blower employs a DC blower that is inexpensive and small in size and low in noise.

  In a large centrifuge, the control device and the drive unit are cooled by separate fans. However, in order to reduce the size of a small centrifuge, the control device and the drive unit can be combined with a single blower. The arrangement structure is devised so that both can be cooled. The blower is generally composed of a DC motor that uses a drive power source of + 12V to + 24V, and the drive power source of the DC motor used for the door lock mechanism is the same as that of the blower because of the simplification and miniaturization of the power supply unit. The system is designed to be used. Since the starting current of the motor used for the door lock mechanism is a current value obtained by limiting the power supply voltage of the driving power source with the winding resistance value of the DC motor, the maximum current is, for example, about 1 to 2A. The starting current generates a starting torque in the DC motor of the door lock mechanism unit to drive the door lock unit. The steady current of the DC motor of the door lock mechanism has a considerably smaller current value than the starting current, for example, about several hundred mA. Moreover, the DC blower employed in the centrifugal separator employs a fan with an input power of approximately 10 W or less, and a steady current of several hundred mA flows.

  In Patent Document 1 below, in order to reduce fluctuations in the output voltage of the power transformer due to fluctuations in the load current of the cooling fan that cools the inverter circuit device, the driving at the start of rotation of the cooling fan is controlled on and off. A technique for suppressing fluctuations in the drive power supply by suppressing the starting current is disclosed.

JP-A-11-266594

  Generally, a switching-type drive power supply (control power supply) can be made compact by a high-frequency switching system, but a countermeasure component for removing noise generated during switching is required. In order to solve this problem and prevent the generation of transmission noise from the centrifuge, the drive power supply employs a commercial frequency transformer with less switching noise.

  That is, a voltage is stepped down by the commercial frequency transformer, and a DC voltage is generated by a rectifying and smoothing circuit. This DC voltage includes a ripple voltage of the power supply frequency component and is affected by fluctuations in the AC power supply voltage, so that it is generally configured so that a stable constant voltage can be output by a series regulator circuit. In addition, a thermal fuse is built in as a measure for protecting against a short circuit of a commercial frequency transformer. Furthermore, by combining a series regulator circuit, it has an overheat protection function and an overcurrent function against overload and short circuit of the load side circuit.

  In the centrifuge described above, the maximum current of the drive power source used for the DC motor of the door lock mechanism and the DC motor of the blower is the peak value of the starting current of the DC motor in the door lock mechanism and the current value of the DC motor in the blower. The combined value is a relatively excessive current value. For this reason, in order to supply the maximum current, the drive power source needs to be configured with a commercial frequency transformer and a series regulator circuit in a large size, and there is a problem that the manufacturing cost of the centrifuge is increased.

  Accordingly, a main object of the present invention is to provide a centrifugal separator that eliminates the problems of the prior art described above, reduces the current consumption of the drive power supply, and reduces the power consumption.

  Another object of the present invention is to provide a low-cost centrifuge by reducing the size of the drive power supply.

  The present invention focuses on the fact that the drive time of the door lock DC motor of the door lock device (door lock means) in the centrifuge is extremely short compared to the drive time of the DC motor for cooling the blower. The operation of the cooling fan (blower DC motor) is substantially stopped only when the drive current of the door lock DC motor flows. The characteristics of typical ones will be described as follows.

  According to one aspect of the present invention, a rotor that accommodates a sample, a driving device that rotationally drives the rotor, a rotor chamber that accommodates the rotor, and an opening of the rotor chamber are opened or closed. An openable / closable door provided in the opening, door lock means for holding the door closed while the rotor is rotationally driven, and a blower for cooling the drive device And a control circuit device for controlling the drive device, the door lock means and the blower, and a control circuit for controlling the door lock means and the blower, and the control circuit. The device stops power supply from the drive power source to the blower when driving the door lock means, or supplies current less than a predetermined current, and After terminates the driving of the click means, whether to start the power supply to the blower, or by feeding the predetermined electric current, reducing the current consumption of the drive power source.

  According to another feature of the invention, the control circuit device stops feeding the predetermined current to the blower before a predetermined first time for driving the door lock means, and drives the door lock means. The current consumption of the drive power supply is reduced by supplying the predetermined current to the blower after a lapse of a predetermined second time after the termination.

  According to still another feature of the present invention, the control circuit device feeds a current lower than the predetermined current when driving the door lock means, and after the drive of the door lock means is finished, the blower The current consumption of the drive power supply is reduced by feeding the predetermined current to the power source.

  According to still another aspect of the present invention, the control circuit device feeds a current lower than the predetermined current to the blower before a predetermined first time for driving the door lock means, and the door lock means The current consumption of the drive power supply is reduced by feeding the predetermined current to the blower after a lapse of a predetermined second time after the drive is finished.

  Without adding new circuit components, it becomes possible to reduce the combined value of the drive power supply current of the door lock DC motor of the door lock means and the drive power supply current of the DC motor of the cooling blower. Power consumption can be reduced.

  By reducing the power consumption of the drive power supply, the drive power supply can be reduced in size and a low-cost centrifuge can be provided.

  In the present invention, since the cooling blower is stopped for a short time when the door lock means is driven, the cooling effect of the cooling blower is not impaired. That is, the intended purpose can be achieved without causing the centrifuge user to feel uncomfortable.

  The above and other objects, and the above and other features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

  1 is a configuration diagram of a centrifuge according to an embodiment of the present invention, FIG. 2 is a front view showing a door lock device of the centrifuge shown in FIG. 1, and FIG. 3 is a perspective view of the door lock device shown in FIG. FIG. 4 shows a functional block diagram of the centrifuge shown in FIG.

[Overall configuration of centrifuge]
As shown in FIG. 1, a centrifuge 100 has a rotor chamber 3 housed in a frame 1 and partitioned by a partition member 31 including a metal material bowl and the like and a door 2. A rotor 4 for holding or storing a sample to be separated is provided. The rotor 4 is detachably mounted on the rotation output shaft 72 of the drive unit 7 and is rotationally driven by the drive unit 7 to centrifuge the sample.

  The door 2 is attached to the frame 1 with a hinge or the like, and is disposed so as to be openable and closable in the vertical direction so as to open or close the opening 32 of the rotor chamber 3. The opening 32 of the rotor chamber 3 is covered with the door 2 so that the door lock device 5 prevents the door 2 from opening when the rotor 4 is rotating, that is, when the drive unit 7 is operating or the rotor 4 is broken. Is provided.

  An example of the door lock device 5 is shown in FIGS. The door lock device 5 includes a lock lever 55 that rotates about a support shaft 56 provided on the door lock base 57. One end of the lock lever 55 is configured to be hooked on the door hook 21 fixed to the door 2, and the other end of the lock lever 55 is formed of, for example, a normal brushed DC motor by a connecting rod 54 and a crank 53. It is coupled to the rotating shaft 52 of the door lock DC motor 51.

  As will be described later, when a predetermined starting current is passed through the door lock DC motor 51 for a short time after the start switch of the centrifuge 100 is turned on, the door lock DC motor 51 rotates and the crank 53 and the connection are connected. The bar 54 moves to the upper position, and the lock lever 55 rotates so as to be hooked on the door hook 21 as shown in FIG. As a result, the lock lever 55 locks (holds) the door 2 in the closed state. In order to release the locked state, when a predetermined starting current is again supplied to the door lock DC motor 51 for a short time, the crank 53 and the connecting rod 54 are moved to the lower position, and as shown in FIG. The lever 55 moves away from the door hook 21 to the right position. As a result, the lock lever 55 releases the locked state. In order to detect the rotational position of the door lock DC motor 51, rotational position detection sensors 58a and 58b are provided to detect the position of the rotational output shaft 52 of the motor every time it rotates halfway. Further, a position detection sensor 59 for the door hook 21 is provided in order to detect whether or not the door 2 is in a closed state in advance. The drive power for the door lock DC motor 51 is supplied from a second drive power Vcc2 (for example, 12V) as will be described later.

  The drive unit 7 (see FIG. 1) is composed of a motor such as a three-phase brushless DC motor, for example, and the current flowing through the armature winding of the motor is controlled by a pulse width modulation signal (PWM signal). Control the number of revolutions. A rotation detection sensor 71 for detecting the rotation speed of the rotor 7 is attached to the rotation output shaft 72 of the drive unit 7. The rotation detection sensor 71 has a structure in which, for example, a disk with a hole is attached to the rotation output shaft 72 and the presence / absence of a hole in the disk is detected as an electrical signal by a photo interrupt or the like.

  A panel display operation unit (input / display device) 9 includes an input operation unit (not shown) for inputting operation conditions such as a set rotation speed, a set operation time, and a set temperature of the rotor 4, and the set operation conditions or It includes a display unit (not shown) for displaying the current operating state of the rotor 4 and is integrated in a panel format.

  The blower (blower DC motor) 6 is a DC motor that is provided to cool the drive unit 7 and a control circuit unit 8 that will be described later. The drive power of the blower DC motor 6 is supplied from the second drive power Vcc2 (for example, 12 V), as with the door lock DC motor 51, as will be described later.

  The control circuit device 8 is provided to execute rotation control of the rotor 4 (drive unit 7), temperature control of the rotor chamber 34, and the like. As shown in FIG. 4, detailed functional blocks of the control circuit device 8 include an MPU (Micro Processor Unit) 80, a CPU (Central Processing Unit) unit 80a, a nonvolatile memory 80b, and a volatile memory 80c. And a single semiconductor chip or a plurality of semiconductor chips mounted on a circuit board.

  The CPU 80a is provided for performing arithmetic processing based on the contents of the program written in the nonvolatile memory 80b. The non-volatile memory 80b is a semiconductor memory such as a ROM that can retain stored contents even when the drive power (control power) is turned off, and a control program for the centrifuge 100 is written therein. The volatile memory 80c is a semiconductor memory such as a RAM that can read and write data at any time, and is provided for temporarily storing data and the like for arithmetic processing by the CPU 80a.

  The non-volatile memory 81 is composed of an EEPROM (Electrically Erasable and Programmable Read Only Memory), and is a memory that can electrically rewrite data contents, and stores storage information such as operating conditions and operating history of the centrifuge 100. Is provided. The drive control unit 82 is provided to drive and control the drive unit 7 based on the rotation control signal of the MPU 80 to control the rotation of the rotor 4. The rotation speed detection unit 83 detects a rotation speed signal from the rotation detection sensor unit 71 and inputs the current rotation speed to the MPU 80 for recognition.

  The motor drive unit 84 is provided to drive the door lock DC motor 51 (see FIG. 3) of the door lock device 5 and control the lock or unlock of the door 2 based on the control signal from the MPU 80. The blower drive unit 85 is provided to drive and control the blower DC motor 6 based on the control signal of the MPU 80.

  The panel control unit 86 displays the setting state and the current operation state of the centrifuge 100 on the display unit of the panel display operation unit 9 based on the control signal of the MPU 80, and from the input operation unit of the panel display operation unit 9. Input information such as a set value of the centrifuge 100 is input to the MPU 80.

[Configuration of drive power supply]
The configuration of the control circuit device 8 includes a drive power supply (control power supply) 87 for supplying a DC voltage to the control circuit section main body according to the present invention. The drive power supply 87 includes a commercial frequency transformer 87a, a pair of rectifying / smoothing units 88a and 88b, and a pair of series regulators 89a and 89b.

  The power transformer 87a is a voltage transformer having a pair of AC output taps for rectifying a low DC voltage (for example, a pair of 5V and 12V) from a power supply voltage (for example, 100V) having a commercial frequency of 50/60 Hz. It is.

  The first rectifying / smoothing unit 88a rectifies and smoothes the AC voltage stepped down by the first AC output tap of the power transformer 87 and converts it into a DC voltage including a ripple voltage of a commercial frequency component. The first series regulator 89a is connected to the output side of the first rectifying / smoothing unit 88a and controls the DC voltage including the commercial frequency component ripple voltage converted by the first rectifying / smoothing unit 88a to a stable constant voltage. The output terminal 89c outputs a stable first DC voltage Vcc1 having no ripple. The first DC voltage Vcc1 at the output terminal 89c is, for example, a DC voltage of 5V. As shown in the figure, the MPU 80, the nonvolatile memory 81, the drive controller 82, the rotation detector 83, the motor driver 84, and the blower driver 85. Power is supplied as drive power for the control body of the panel control unit 86 and the panel display operation unit 9.

  The second rectifying / smoothing unit 88b rectifies and smoothes the AC voltage stepped down by the second AC output tap of the power transformer 87 and converts it to a DC voltage including a ripple voltage of a commercial frequency component. The second series regulator 89b is connected to the output side of the second rectifying / smoothing unit 88b and controls the DC voltage including the commercial frequency component ripple voltage converted by the second rectifying / smoothing unit 88b to a stable constant voltage. The stable second DC voltage Vcc2 having no ripple is output to the output terminal 89d. The second DC voltage Vcc2 at the output terminal 89d is a DC voltage higher than the first DC voltage Vcc1, for example, 12V, and is used as a driving power source for the door lock DC motor 51 and the blower DC motor 6 as shown in the figure. Power is supplied.

[Drive power control method]
Next, a control flowchart according to the present invention in the case of controlling the operation of the centrifuge 100 will be described with reference to FIG. The operation is controlled according to the following control procedure according to the program written in the nonvolatile memory 80b in the MPU 80.

  When a start switch (START switch) that is an input operation unit of the panel display operation unit 9 is pressed (ON), an ON signal of the start switch is transmitted from the panel control unit 86 to the MPU 80 (step S1). When the MPU 80 recognizes the start switch ON by the switch ON process, the blower drive unit 85 stops the blower (blower DC motor) 6 (step S2).

  Next, in step S3, a count process is performed until the waiting time t1 elapses so that the stop process of the blower 6 is completely finished in consideration of the operation delay (step S3).

  When the t1 counting process in step S3 is completed, the door lock DC motor 51 of the door lock device 5 described above is driven and the lock lever 55 is hooked on the door hook 21 based on the control of the motor drive unit 84. The door 2 is locked in the closed state (sealed state) to complete the door lock (step S4). In order to wait for the operation delay of the door lock process in step S4, the waiting time t2 is counted until the time t2 elapses (step S5).

  Next, the blower driving unit 85 is driven, and the operation of the blower DC motor 6 is restarted (step S6). Following the operation of the blower (blower DC motor) 6, the drive control unit 82 is controlled based on the rotation number signal detected by the rotation number detection unit 83 to control the rotation of the rotor 4 (drive unit 7). In the rotation control of the rotor 4 by the drive control unit 82, the acceleration control is continued until the set number of rotations input from the input unit of the panel display operation unit 9 is reached (step S8).

  As a result of determining whether or not the rotor 4 has reached the set rotational speed in step S8, it is determined that the rotational speed signal detected by the rotational speed detecting unit 83 has reached the set rotational speed by comparing with the set rotational speed. Then, the drive control part 82 carries out settling control of the rotor 4 (drive part 7) (step S9). In the settling control in step S9, the rotor 4 is continuously controlled so that the set rotational speed becomes a constant rotational speed, and the sample held in the rotor 4 is centrifuged.

  After the settling control of the rotor 4 is continued for a certain period of time, when the stop switch (STOP switch) of the input operation unit of the panel display operation unit 9 is pressed (ON) (step S10), the stop switch is turned on. Then, the control of the constant rotational speed is finished, and the deceleration control process of the rotor 4 is started (step S11). The deceleration control process in step S11 continues to decelerate until the rotor 4 stops. In the above embodiment, the case where the operator has forcibly turned on the stop switch of the input operation unit of the panel display operation unit 9 has been described as an example. However, the operation time (set time) from the panel display operation unit 9 in advance. Is set and input, and the deceleration control process is automatically started even when the set operation time has elapsed.

  Based on the deceleration control in step S11, it is determined whether or not the rotor 4 has stopped rotating (step S12). If it is determined in step S12 that the rotor 4 has stopped rotating, the blower drive unit 85 is controlled to stop the rotation of the blower DC motor 6 (step S13). Next, similarly to step S2 described above, the counting process is continued until a predetermined time t1 elapses in consideration of the operation delay of the stopping process of the blower DC motor 6 (step S14).

  In the time counting process of step S14, when the counting of the predetermined time t1 is completed, the door driving DC motor 51 is driven by the control of the motor driving unit 84 to release the locking of the lock lever 55 and the door hook 21. The locked state of the door 2 is released. At this time, similarly to the determination of the operation delay time at the time of door lock in step S5 described above, the count process is continued until a predetermined time t2 elapses in order to wait for the operation delay of the door lock release process (step S16). When the predetermined time t2 has elapsed, the blower drive unit 85 is driven, and the drive of the blower DC motor 6 is resumed (step S17).

[Current change of drive power supply Vcc2]
According to the above-described operation control of the present invention, the time chart of the motor current im of the door lock DC motor 51, the motor current if of the blower DC motor 6, and the total current ir of the drive power supply Vcc2 is as shown in FIG. Change.

  The operation control according to the present invention pays attention to the fact that the door lock DC motor 51 can be operated by the energization time t0 of the motor current im for a relatively short time (for example, 0.5 seconds) within 1 second, The cooling effect of the blower DC motor 6 is configured by paying attention to the fact that the cooling effect is not impaired, for example, when the operation is stopped for a short time of about 1 second.

  As shown in FIG. 6A, the motor current im of the door lock DC motor 51 is a peak current Imot supplied from the drive power supply Vcc2 (for example, 12 V) in a short time t0 (for example, 0.5 seconds). (For example, 1.1A), door lock or door lock release is possible.

  On the other hand, as shown in FIG. 6B, the motor current if of the blower DC motor 6 is constantly relatively low from the drive power supply Vcc2 while the drive unit 7 or the control circuit device 8 is operating. A predetermined current Ifan (for example, 0.5 A) is supplied. The fan 6 cools the drive unit 7 or the control circuit device 8 by the predetermined current Ifan. However, this cooling effect is not impaired even if the operation of the blower 6 is stopped in a short time such as within one second. The present invention is configured in consideration of such characteristics of the blower 6.

  That is, as shown in FIG. 6C, according to the typical operation control of the present invention, the blower DC motor 6 is configured such that the blower DC motor 6 has a stop waiting time t1 and the door lock device 5 is locked. During the total time (t1 + t0 + t2) including the waiting time t2 for driving or door unlocking driving and the driving time t0 for the door locking DC motor 51, the operation of the blower DC motor 6 is stopped, and conversely the door locking DC motor 51. It is the time when the driving starts. Therefore, the current consumption ir flowing through the drive power supply Vcc2 is time-divisionally divided into the current im of the door lock DC motor 51 in FIG. 6A and the motor current if of the blower DC motor 6 in FIG. Therefore, as shown in FIG. 6C, the maximum peak current of the current ir of the drive power supply Vcc2 is kept equal to the peak current Imot (eg, 1.1 A) of the door lock motor current im. Can do. As shown in FIG. 7C, the peak current Imot of the current ir of the drive power supply Vcc2 is a conventional system in which the door lock motor current im and the motor current if of the blower DC motor 6 are simultaneously fed from the drive power supply Vcc2. Compared to the peak current (Imot + Ifan) (for example, 1.6 A) of the current ir in FIG.

  According to the operation control system of the above embodiment, the current ir of the drive power supply Vcc2 can be reduced to reduce the power consumption of the drive power supply Vcc2, so that the current capacity of the power transformer 87a (see FIG. 4) constituting the drive power supply Vcc2 Can be reduced. Therefore, the drive power supply 87 can be reduced in size, and a low-cost centrifuge can be provided.

  In the above embodiment, the waiting times t1 and t2 are set. However, when the door lock DC motor 51 is driven, the same effect can be obtained even when the times t1 and t2 are not set.

  Furthermore, when the starting current Imot flows as the motor current im of the door lock DC motor 51, the motor current im can be set to a current value lower than the predetermined current value Ifan by lowering the drive voltage of the blower DC motor 6. Thereby, the current ir supplied from the drive power supply Vcc2 may be kept low.

  As mentioned above, although the invention made | formed by this inventor was demonstrated based on embodiment, this invention is not limited to the said embodiment, A various change is possible within the range which does not deviate from the summary.

The block diagram of the centrifuge which concerns on embodiment of this invention. The block diagram (front view) of the door lock apparatus used for the centrifuge shown in FIG. FIG. 3 is a perspective view of the door lock device shown in FIG. 2. The functional block diagram of the centrifuge shown in FIG. The control flowchart for driving the centrifuge shown in FIG. The current time chart of the drive power supply of the centrifuge shown in FIG. The current time chart of the drive power supply of the centrifuge in a conventional operation system.

Explanation of symbols

1: Frame 2: Door 3: Rotor chamber 31: Partition member 32: Rotor chamber opening 4: Rotor 5: Door lock device 51: DC motor for door lock 52: Rotation output shaft 53: Crank 54: Connecting rod 55: Lock Lever 56: Support shaft 57: Door lock base 58a, 58b: Position sensor 59: Position sensor 6: Blower (DC motor for blower) 7: Drive unit 71: Rotation detection sensor 72: Drive unit rotary shaft 8: Control circuit device 80 : MPU
81: non-volatile memory 82: drive control unit 83: rotation speed detection unit 84: motor drive unit 85: blower drive unit 86: panel control unit 87: drive power source (control power source) 87a: power transformers 88a, 88b: rectifying and smoothing unit 89a 89b: Series regulators 89c, 89d: Power output terminals Vcc1, Vcc2 9: Bunnell display operation unit 100: Centrifuge Ifan: Predetermined current value of the fan DC motor

Claims (4)

A rotor for accommodating the sample, a driving device for rotationally driving the rotor, a rotor chamber for accommodating the rotor, and an opening for opening or closing the opening of the rotor chamber; Openable and closable doors, door lock means for holding the door closed while the rotor is rotationally driven, a blower for cooling the drive device, the door lock means and the blower In a centrifuge comprising a drive power supply for supplying power, and a control circuit device for controlling the drive device, the door lock means and the blower,
The control circuit device stops power supply from the drive power source to the blower when driving the door lock means, or supplies a current smaller than a predetermined current, and terminates the drive of the door lock means. The centrifuge is characterized in that the current consumption of the drive power supply is reduced by starting power supply to the blower or supplying the predetermined current later.   The control circuit device stops supplying the predetermined current to the blower before a predetermined first time for driving the door lock means, and ends the driving of the door lock means for a predetermined second time. The centrifuge according to claim 1, wherein the current consumption of the driving power source is reduced by feeding the predetermined current to the blower after elapse of time.   The control circuit device feeds a current lower than the predetermined current when driving the door lock means, and feeds the predetermined current to the blower after finishing driving the door lock means, 2. The centrifugal separator according to claim 1, wherein a current consumption of the driving power source is reduced.   The control circuit device supplies a current lower than the predetermined current to the blower before a predetermined first time for driving the door lock means, and after the driving of the door lock means is ended for a predetermined second time. The centrifuge according to claim 1, wherein the current consumption of the drive power source is reduced by feeding the predetermined current to the blower after elapse of time.

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