JPS5457201A - Device ofr controlling number of pumps - Google Patents
Device ofr controlling number of pumpsInfo
- Publication number
- JPS5457201A JPS5457201A JP12250977A JP12250977A JPS5457201A JP S5457201 A JPS5457201 A JP S5457201A JP 12250977 A JP12250977 A JP 12250977A JP 12250977 A JP12250977 A JP 12250977A JP S5457201 A JPS5457201 A JP S5457201A
- Authority
- JP
- Japan
- Prior art keywords
- flow
- discharge
- pumps
- rate
- pump
- 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 exercise the infinite change of the discharge and prevent the overheating of pumps due to no-discharge operation by adding or separating pumps in parallel operation through the comparison with the fixed discharge compensated according to the suction head.
CONSTITUTION: Pumps 7W8 absorb water from a water tank 1 through a suction pipe 2 and discharge through a flow pipe 14. A pressure oscillator 3 and a flow- rate oscillator 15 measure the suction head and the flow amount. Though the flow- rate value, at which the discharge reaches its limit with the pump 7 operating and the pump 8 must begin operating parallel to it, may vary according to the suction head, its compensated value is sent through a function generator 5 to a calculating device 16 to be added to the outlet signal of a flow-rate oscillator 15, and the flow rate is thus compensated. The result is compared with the fixed value by a meter- ralay 17, and the pump 8 is to be operated parallel through an operating number director 13
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12250977A JPS5457201A (en) | 1977-10-14 | 1977-10-14 | Device ofr controlling number of pumps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12250977A JPS5457201A (en) | 1977-10-14 | 1977-10-14 | Device ofr controlling number of pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5457201A true JPS5457201A (en) | 1979-05-08 |
Family
ID=14837600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12250977A Pending JPS5457201A (en) | 1977-10-14 | 1977-10-14 | Device ofr controlling number of pumps |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5457201A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832996A (en) * | 1981-08-24 | 1983-02-26 | Kubota Ltd | Pump unit number switching operation method |
JP2007170403A (en) * | 1995-03-28 | 2007-07-05 | Ebara Corp | Variable speed water supply device |
-
1977
- 1977-10-14 JP JP12250977A patent/JPS5457201A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832996A (en) * | 1981-08-24 | 1983-02-26 | Kubota Ltd | Pump unit number switching operation method |
JP2007170403A (en) * | 1995-03-28 | 2007-07-05 | Ebara Corp | Variable speed water supply device |
JP4541369B2 (en) * | 1995-03-28 | 2010-09-08 | 株式会社荏原製作所 | Variable speed water supply device |
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