Title:
LIQUID TRANSFERRING DEVICE AND ITS CONTROLLING METHOD
Document Type and Number:
Japanese Patent JP3777490
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent stagnation of liquid in a discharge pipe and stop fluid flow by means of a pump itself, by arranging a screw type pump having a pump rotor which can be controlled in rotational speed in both normal and reverse directions on the way of a liquid transferring line, and thereby suctioning back the liquid in a reverse direction.
SOLUTION: In order to feed liquid, a pump rotor 13 is rotated in a normal direction, that is, a direction for spirally feeding liquid along a screw thread groove 12a from a suctioning port 2a to a discharging port 2b. After completing feeding of a required amount of liquid, the residual liquid in a discharge pipe 4 is suctioned back into a suction pipe 3. Namely, after the pump rotor 12 is stopped, the rotational direction of the pump rotor 12 is changed for suctioning the residual liquid inside the discharge pipe 4 back to the suction pipe 3. When the pump rotor 12 is stopped, however, liquid is under contraflow due to a large discharging port head and pressure difference between the pump suctioning side and the discharging side. In such a case, the rotational speed of the pump rotor 12 is reduced for performing suctioning back.
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Inventors:
Shigeichi Yamamoto
Tetsuma Ikegami
Takuji Sofukawa
Shunichi Aiyoshizawa
Toshiharu Nakazawa
Yoshinori Kojima
Tetsuma Ikegami
Takuji Sofukawa
Shunichi Aiyoshizawa
Toshiharu Nakazawa
Yoshinori Kojima
Application Number:
JP2392598A
Publication Date:
May 24, 2006
Filing Date:
January 21, 1998
Export Citation:
Assignee:
Ebara Corporation
Ebara Densan Co., Ltd.
Ebara Densan Co., Ltd.
International Classes:
F04C2/16; F04D3/02; F04C15/00; F04D7/04; F04D13/06; F04D15/00; F04D29/04; F04D29/048; F17D1/14; H02K7/09; H02K7/14; H02K29/00; H02P6/22; (IPC1-7): F04C15/00; F04C2/16; F17D1/14; H02K7/09; H02K29/00; //H02K7/14; H02P6/22
Domestic Patent References:
| JP3016675A | ||||
| JP2176184A | ||||
| JP6087686U | ||||
| JP7180689A | ||||
| JP9014184A |
Attorney, Agent or Firm:
Isamu Watanabe
Shintaro Hotta
Susumu Ohata
Shintaro Hotta
Susumu Ohata
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