Centrifuge with acceleration and deceleration time display

Patent metadata

Field	Value
Publication number	US-9517476-B2
Application number	US-200913126762-A
Country	US
Kind code	B2
Filing date	Oct 30, 2009
Priority date	Oct 31, 2008
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

According to an aspect of the present invention, there is provided a centrifuge including: a driving unit which rotates a rotor on which a sample is held; an input/output unit which displays information thereon and receives an input from a user therethrough; and a control unit which controls a rotation speed of the rotor to an input set rotation speed; wherein, when the rotor is rotating, the input/output unit displays first time information corresponding to a time when the rotor has been accelerated to the set rotation speed.

First claim

The invention claimed is:

1. A centrifuge comprising:
a driving unit which rotates a rotor on which a sample is held;
an input/output unit which receives input information indicative of a set rotation speed of the rotor and a set operation time period for performing a centrifugal operation from a user therethrough;
a control unit which controls a rotation speed of the rotor based on the received input information and that includes a controller configured to calculate a first time information indicative of an amount of the set operation time period remaining until the rotor speed of the rotor arrives at the set rotation speed based at least upon (i) rotor information which is associated with the centrifuge, (ii) input set rotation speed and (iii) rotation acceleration inclination pattern; and
a display unit configured to display the information of the set rotation speed of the rotor and the set operation time period for performing the centrifugal operation, and further, when the rotor is rotated, to display the first time information indicative of the amount of the set operation time period remaining until the rotor speed of the rotor arrives at the set rotation speed,
wherein the control unit stores a plurality of rotation acceleration inclination patterns of the rotor, and
wherein the control unit calculates the first time information from a corresponding one of the rotation acceleration inclination patterns that is selected from the stored rotation acceleration inclination patterns based on an actual rotation acceleration inclination of the rotor rotated by the driving unit.

2. The centrifuge according to claim 1 , wherein the control unit stores in advance an acceleration time taken for each type of the rotor, and
wherein the control unit calculates the first time information by identifying the rotor attached to the driving unit and reading the acceleration time taken for the identified rotor.

3. The centrifuge according to claim 1 , wherein the input/output unit includes a change button enabling selective visualization on the display unit, when the rotor is rotated, of the time information indicating the amount of time remaining until the rotor speed of the rotor arrives at the set rotation speed or time information indicating a time when the rotation speed of the rotor will arrive at the set rotation speed.

4. The centrifuge according to claim 1 , wherein, when the rotor is decelerated, the input/output unit displays second time information corresponding to a time when the rotor stops.

5. The centrifuge according to claim 4 , wherein the second time information is an amount of time remaining until the rotation of the rotor stops.

6. The centrifuge according to claim 4 , wherein the second time information is indicative of a time when the rotation of the rotor will stop.

7. The centrifuge according to claim 1 , further comprising:
a depressurization unit which depressurizes a rotor chamber accommodating the rotor, and
wherein the display unit is further configured to display, when the rotor is rotated, the time information corresponding to the time when the rotor has been accelerated to the set rotation speed.

8. The centrifuge according to claim 7 , wherein the time information is calculated based on a time to be taken until the rotor chamber has been completely depressurized and a time to be taken until the rotor has been accelerated to the set rotation speed after being depressurized.

9. The centrifuge according to claim 8 , wherein, when a pressure of the rotor chamber is larger than a predetermined value, the controller unit controls the rotor to rotate at a limited rpm, and
wherein, when the pressure of the rotor chamber is not more than the predetermined value, the controller unit controls the rotor to accelerate from the limited rpm to the set rotation speed.

10. The centrifuge according to claim 9 , wherein the time information is an amount of time remaining until the rotation speed of the rotor arrives at the set rotation speed.

11. The centrifuge according to claim 9 , wherein the time information is indicative of a time when the rotation speed of the rotor will arrive at the set rotation speed.

12. The centrifuge according to claim 9 , wherein the time information is recalculated and displayed on the display unit per predetermined time.

13. The centrifuge according to claim 1 further comprising:
a vacuum pump which depressurizes a pressure of a rotation chamber by sucking air therefrom;
wherein the control unit calculates a vacuum arrival time to be taken until a predetermined vacuum degree has been obtained by the vacuum pump, and the display unit displays the calculated vacuum arrival time.

14. The centrifuge according to claim 13 , wherein the predetermined vacuum degree is a vacuum degree at which the rotor can continuously rotate at an user-set rpm without increasing the temperature due to friction with remaining air.

15. The centrifuge according to claim 13 , wherein the control unit recalculates the vacuum arrival time at a predetermined interval, and the display unit displays the recalculated vacuum arrival time.

16. The centrifuge according to claim 13 , wherein the vacuum pump includes an oil diffusion vacuum pump,
wherein the oil diffusion vacuum pump includes a temperature sensor which detects a temperature of an operation oil, and
wherein the control unit calculates the vacuum arrival time based on the temperature of the operation oil detected by the temperature sensor.

17. The centrifuge according to claim 16 , wherein the vacuum pump further includes an oil rotation vacuum pump, and
wherein a depressurizing operation is performed by the oil rotation vacuum pump until arriving at a threshold back pressure, at which the oil diffusion vacuum pump effectively operates, from an atmospheric pressure.

18. The centrifuge according to claim 17 , wherein the control unit calculates the vacuum arrival time in such a manner that three divided time regions are obtained, an estimated arrival time for each of the time regions is calculated, and a sum of the estimated arrival time is obtained, where the three divided time regions include a time region ( 1 ) from a depressurization start to the threshold back pressure of the oil diffusion vacuum pump, a time region ( 2 ) from the threshold back pressure until the temperature of the operation oil arrives at an operation temperature of the oil diffusion vacuum pump, and a time region ( 3 ) until the oil diffusion vacuum pump effectively operates and the predetermined vacuum degree is obtained.

19. The centrifuge according to claim 18 , wherein the control unit stores in advance a temperature curve of the oil diffusion vacuum pump or an arrival curve of the vacuum degree inside the rotation chamber for each of the time regions ( 1 ) to ( 3 ), and calculates the estimated arrival time for each of the time regions by using the stored curves.

20. The centrifuge according to claim 13 , wherein the control unit compares the vacuum arrival time recalculated at a predetermined interval, and displays a message on the display unit when a change of the compared vacuum arrival time is abnormal.

21. The centrifuge according to claim 20 , wherein the control unit determines that the abnormality occurs when the state where the compared vacuum arrival time is not reduced is continued over a predetermined number of times or more.

Assignees

• Ooyama Hisanobu
• Takahashi Hiroyuki
• Kusumoto Shoji
• Haruki Shinichi
• Shimizu Yuki
• Hitachi Koki Kk

Inventors

• Ooyama Hisanobu
• Takahashi Hiroyuki
• Kusumoto Shoji
• Haruki Shinichi
• Shimizu Yuki

Classifications

• B04B9/10 Primary

  Control of the drive; Speed regulating {(for solid bowl screw centrifuges B04B1/2016)} · CPC title

• B04B13/00

  Control arrangements specially designed for centrifuges; Program control of centrifuges (control arrangements for feed, charge or discharge B04B11/00) · CPC title

• B04B15/08

  for ventilating or producing a vacuum in the centrifuge · CPC title