JPS60187797A - Protective device for fan - Google Patents

Protective device for fan

Info

Publication number
JPS60187797A
JPS60187797A JP4335384A JP4335384A JPS60187797A JP S60187797 A JPS60187797 A JP S60187797A JP 4335384 A JP4335384 A JP 4335384A JP 4335384 A JP4335384 A JP 4335384A JP S60187797 A JPS60187797 A JP S60187797A
Authority
JP
Japan
Prior art keywords
fan
relay
surging
run
draft
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.)
Granted
Application number
JP4335384A
Other languages
Japanese (ja)
Other versions
JPH0260879B2 (en
Inventor
Eiichi Kaminaga
Akira Sugano
Akira Nishimura
Masaru Muramatsu
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4335384A priority Critical patent/JPH0260879B2/ja
Publication of JPS60187797A publication Critical patent/JPS60187797A/en
Publication of JPH0260879B2 publication Critical patent/JPH0260879B2/ja
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the fan from rushing into surging condition surely and improve reliability by a method wherein the operating condition of the fan is detected that it has exceeded an alarm area corresponding to the limit of surging and the load of the fan is run back quickly by the detecting signal.
CONSTITUTION: When the fan has rushed into the limit of surging, an auxiliary relay X1 33 is operated through a timer relay T1 32 and the load of the fan is run back to a proper load by the contact of the relay X1 33 to protect the fan through a sequence circuit shown in the diagram. Further, in addition to the detection through said time limit, the draft of a furnace upon rushing into the surging alarm area is detected by a detector 34 to detect that the draft is larger than the specified draft of a boiler or the vibration of the fan is detected by the detector 35 that the value of vibration is higher than a specified value. Then, the auxiliary relay X2 37 is operated by the time relay T2 36 through a malfunction timer to run back the fan through the contact of the relay X2 37. According to this method, inrush of the fan into the surging condition may be precluded surely and the reliability of the fan may be improved.
COPYRIGHT: (C)1985,JPO&Japio
JP4335384A 1984-03-07 1984-03-07 Expired JPH0260879B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4335384A JPH0260879B2 (en) 1984-03-07 1984-03-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4335384A JPH0260879B2 (en) 1984-03-07 1984-03-07

Publications (2)

Publication Number Publication Date
JPS60187797A true JPS60187797A (en) 1985-09-25
JPH0260879B2 JPH0260879B2 (en) 1990-12-18

Family

ID=12661486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4335384A Expired JPH0260879B2 (en) 1984-03-07 1984-03-07

Country Status (1)

Country Link
JP (1) JPH0260879B2 (en)

Also Published As

Publication number Publication date
JPH0260879B2 (en) 1990-12-18

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees