JPS5457201A - Device ofr controlling number of pumps - Google Patents

Device ofr controlling number of pumps

Info

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
Application number
JP12250977A
Other languages
Japanese (ja)
Inventor
Reiji Endo
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.)
Toyo Electric Manufacturing Ltd
Original Assignee
Toyo Electric Manufacturing 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 Toyo Electric Manufacturing Ltd filed Critical Toyo Electric Manufacturing Ltd
Priority to JP12250977A priority Critical patent/JPS5457201A/en
Publication of JPS5457201A publication Critical patent/JPS5457201A/en
Pending legal-status Critical Current

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
JP12250977A 1977-10-14 1977-10-14 Device ofr controlling number of pumps Pending JPS5457201A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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