JPS5543227A - Protective device for pump - Google Patents
Protective device for pumpInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63277895A (en) * | 1987-05-07 | 1988-11-15 | Shibaura Eng Works Co Ltd | Pump device |
-
1978
- 1978-09-21 JP JP11510278A patent/JPS5543227A/en active Pending
Cited By (1)
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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