JPS62135697A - Broken-down fan detecting structure - Google Patents

Abstract

PURPOSE:To specify, maintain, and restore a broken-down fan within multiple fans by arranging multiple resistors belonging to the multiple fans and having different resistance values in parallel with relays for detecting the abnormality of the rotating speed. CONSTITUTION:Rotation abnormality detecting relays 1 belonging to fans 4 are connected in series, are turned on when the rotating speed of the fans 4 is normal, and are turned off when the rotating speed becomes a reference or less. Resistors 2 for specifying a broken-down fan have different resistance valves r1-rn respectively. A judging circuit 3 specifies a failed fan. Thereby, each relay 1 is turned on when the fan is rotated normally, thus the resultant resistance value of individual resistance values r1-rn is 0OMEGA when all fans are rotated normally. On the other hand, when any fan 4 fails, the broken-down fan 4 can be specified by the resultant resistance value. Accordingly, the broken- down fan 4 can be quickly maintained and restored.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a failed fan detection structure, particularly to a failed fan detection structure that can identify a failed fan among a plurality of fans for forced air cooling in electronic equipment. .

[Conventional technology]

In recent years, as electronic devices such as computers have become smaller and their operating speeds have increased, electronic components such as a plurality of integrated circuit packages are mounted at high density.

Therefore, the amount of heat generated per unit volume of electronic components within the device is increasing. To remove this heat, a method as shown in FIG. 2 is used.

That is, a fan box 5 equipped with a plurality of cooling fans 4 is arranged as shown in FIG.
is being discharged outside.

Here, in order to prevent the integrated circuit package 7 from being destroyed by heat due to a failure of the fan 4 in the fan box 5, a detection circuit as shown in FIG. 3 is prepared. We are taking measures such as stopping the power supply to.

In other words, make sure that each fan 4 has a normal rotation speed,
Prepare a relay 1 that breaks when the number of rotations falls below a standard, and connect this in series with, for example, five fan boxes, or in series with each case, so that if one of the fans breaks down and the number of rotations decreases, The detection circuit 9 detects that the closed circuit caused by the relay 1 is opened for each group of fans forming the closed circuit, and takes measures such as stopping the supply of electricity to the printed circuit board 6. With this detection power method, it is necessary to take measures such as energizing the fan box 5 and replace a malfunctioning fan, which requires a lot of time for maintenance.

In recent years, electronic devices are required to have higher reliability, and even if a failure occurs, it is necessary to restore it in a shorter time.

[Problem 3 to be solved by the invention] In other words, the conventional failure fan detection structure described above (well, failure can only be detected in units of multiple fans that constitute a closed circuit for detection, The problem is that it requires work to identify the problem, and it takes more time for maintenance and recovery when a failure occurs.

[Means for solving problems]

The failure fan detection structure of the present invention connects resistors with different resistance values in parallel to the relay contacts i of the relay for detecting abnormal rotation speed of the fan of 121, H, and connects the relay contacts in series. The system includes a judgment circuit for determining the combined resistance value of each resistor attached to the connection and relay contacts, and immediately identifies a failed fan based on the difference in the combined resistance value due to the combination of failed fans.

〔Example〕

Next, embodiments of the present invention will be described using the drawings.

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

The failure fan detection structure shown in FIG. 1 includes a relay 1 for detecting abnormal rotation speed, a resistor 2, and a determination circuit 3.

A relay 1 attached to the fan for detecting an abnormality in rotation speed is connected in series, and it activates when the fan rotation speed is normal, and breaks when the rotation speed falls below the standard. The resistor 2 for identifying a faulty fan has resistance values r 1 , r 2 ・
-・rn-1, rn 2"(') 411G holdings are all different. The determination circuit 3 is a circuit for identifying a faulty fan.

Relay 1 is closed during normal rotation, so if all fans are normal, the combined resistance value from the resistance value to ri will be OΩ. If any fan or fans fails, the resistance fO! rl to rn
Since the values up to and including the resistors are all different as described above, no matter what combination of fans fails, the failed fan can be identified based on the combined resistance value.

Therefore, it becomes possible to identify a failed fan at the same time as the failure occurs, and it becomes possible to shorten the time required for restoration and maintenance.

In addition, in the above-mentioned embodiment, a relay that is activated during normal rotation is used, but a relay that is activated during normal rotation may be used.

〔Effect of the invention〕

The faulty fan detection structure of the present invention inserts resistors with different values in parallel with the relay for detecting abnormal rotation speed, so that a faulty fan among multiple fans can be immediately identified when a fault occurs, and maintenance can be performed quickly when a fault occurs. , it has the effect of being able to recover.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a cooling structure for an electronic device using the present invention and a conventional failure fan detection structure, and FIG. 3 is a conventional example. FIG. 1...Relay, 2...Resistor, 3...
...Judgment circuit, 4...Fan, 5...
・Fan box, 6. Old... Printed circuit board, 7.
−・・・Integrated circuit package, 8・・・Casing,
9...Failure detection circuit. −22)・′ 2nd field

Claims (1)

[Claims] A plurality of fans having a relay for detecting abnormal rotation speed, a plurality of resistors connected in parallel to each of the contacts of the relays and all having different resistance values and connected in series, and the relay contacts are activated when the fan fails. a determination circuit that determines a combined resistance value that changes due to a failure fan detection structure.