JPS5543227A - Protective device for pump - Google Patents

Protective device for pump

Info

Publication number
JPS5543227A
JPS5543227A JP11510278A JP11510278A JPS5543227A JP S5543227 A JPS5543227 A JP S5543227A JP 11510278 A JP11510278 A JP 11510278A JP 11510278 A JP11510278 A JP 11510278A JP S5543227 A JPS5543227 A JP S5543227A
Authority
JP
Japan
Prior art keywords
revolution
pump
water feeding
flow amount
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11510278A
Other languages
Japanese (ja)
Inventor
Wahei Iizuka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11510278A priority Critical patent/JPS5543227A/en
Publication of JPS5543227A publication Critical patent/JPS5543227A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable the detection of maximum and minimum flow amounts permissible at that time through the number of revolution of a pump and to enable the pump to be operated effectively from low speed revolution to high speed revolution, by protecting the pump according to the conditions.
CONSTITUTION: The output signal of a function calculator 8, ie. the number Ni of revolution of a water feeding pump 2 is detected by a revolution detector 7, and the minimum necessary flow amount Q1 at that time which is obtained from the function of the number of revolution in the function calculator 8 and the output aignal of a square root extraction calculator 5, i.e. the suction flow amount Q2 at the time when the number of revolution of the water feeding pump 2 is Ni(rpm) are subtraction-calculated in a subtractor 9. The value is Q2>Q1in normal operation, and Q2<Q1 when an abnormal state is formed. When the suction flow amount Q2 enters into the part painted out with oblique lines as shown in the figure, the contact of an alarm signal setting device 6 is closed, generating an output, and the water feeding pump 2 is brought to stop.
COPYRIGHT: (C)1980,JPO&Japio
JP11510278A 1978-09-21 1978-09-21 Protective device for pump Pending JPS5543227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11510278A JPS5543227A (en) 1978-09-21 1978-09-21 Protective device for pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11510278A JPS5543227A (en) 1978-09-21 1978-09-21 Protective device for pump

Publications (1)

Publication Number Publication Date
JPS5543227A true JPS5543227A (en) 1980-03-27

Family

ID=14654262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11510278A Pending JPS5543227A (en) 1978-09-21 1978-09-21 Protective device for pump

Country Status (1)

Country Link
JP (1) JPS5543227A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63277895A (en) * 1987-05-07 1988-11-15 Shibaura Eng Works Co Ltd Pump device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63277895A (en) * 1987-05-07 1988-11-15 Shibaura Eng Works Co Ltd Pump device

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