JPS5490601A - Pump pressure control system - Google Patents
Pump pressure control systemInfo
- Publication number
- JPS5490601A JPS5490601A JP15747877A JP15747877A JPS5490601A JP S5490601 A JPS5490601 A JP S5490601A JP 15747877 A JP15747877 A JP 15747877A JP 15747877 A JP15747877 A JP 15747877A JP S5490601 A JPS5490601 A JP S5490601A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- speed
- pump
- setter
- revolutions
- 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
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To reduce the fluctuation of pressure at the changing of the number of pumps by providing a switching speed setter and a switching circuit to switch between the output of switching speed setting and the instruction of presure control for increasing or decreasing the revolutions of a variable pump by a fixed number at the changing of the number of pumps.
CONSTITUTION: When discharge is reduced under Q11, a pump number setter 8 is operated to open a switch S1 and close a switch S3 in a switching circuit 11. By this operation, a speed setter SR2 is rapidly shifted from a curve A4 to a curve A3 by giving a number of revolutions N3 for example. Consequently, the driving point is shifted from B5 to B1, and the pressure difference is reduced from P14 to P11. After a constant speed pump P2 is stopped, the switch S3 is opened again and the switch S1 is closed for returning to a pressure system. Thus, the fluctuation of pressure can be reduced by controlling speed by a fixed number of revolutions by means of a speed setting signal from a switching speed setter 10 for corresponding to a standard speed previously adjusted to the pump characteristics at the changing of the number of pumps.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15747877A JPS5490601A (en) | 1977-12-28 | 1977-12-28 | Pump pressure control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15747877A JPS5490601A (en) | 1977-12-28 | 1977-12-28 | Pump pressure control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5490601A true JPS5490601A (en) | 1979-07-18 |
Family
ID=15650548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15747877A Pending JPS5490601A (en) | 1977-12-28 | 1977-12-28 | Pump pressure control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5490601A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5683586A (en) * | 1979-12-12 | 1981-07-08 | Yaskawa Electric Mfg Co Ltd | System for operating plural pumps |
-
1977
- 1977-12-28 JP JP15747877A patent/JPS5490601A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5683586A (en) * | 1979-12-12 | 1981-07-08 | Yaskawa Electric Mfg Co Ltd | System for operating plural pumps |
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