JPH03241893A - Cooling system - Google Patents

Abstract

PURPOSE:To enable a cooling system to carry out a cooling operation of high reliability without making noises by a method wherein cooling fans are made to serve in a pair and to operate at a half rotational speed, a monitoring section monitors the operation of the cooling fans, and one of them is made to operate at a full rotational speed when either of the fans stops operating due to troubles. CONSTITUTION:Cooling fans 1a and 1b are arranged at a prescribed position in a pair. A monitoring section 2 monitors the pulses of number of revolutions outputted from the cooling fans 1a and 1b, and when such troubles as the cooling fans 1a and 1b stop operating and the like are detected by the monitoring section 2, those are notified to a rotational speed control section 3. The rotational speed control section 3 gives an instruction that the fans 1a and 1b operate at a half rotational speed to the fans 1a and 1b when they operate normally and gives an instruction that the normal fan out of the fans 1a and 1b operates at a full rotational speed to the normal fan when the control section 3 is informed that one of them is in troubles.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a cooling method, and has the following features: multiplexing cooling fans to improve reliability;
In order to improve the noise increase caused by multiplexing, a set of two cooling fans whose rotational speed can be controlled and which can cool the object to be cooled at a predetermined rotational speed is arranged, and the A monitoring unit that monitors an abnormality and a rotation speed control unit that controls the rotation speed of the cooling fan are provided, and the cooling fans are arranged as a set of two and each has a half of the predetermined rotation speed. The cooling fan is operated at the predetermined rotation speed, and when the monitoring section detects an abnormal stop of one of the cooling fans, the rotation control section controls the other cooling fan to the predetermined rotation speed.

[Industrial application field]

The present invention relates to an improvement in a cooling method for preventing temperature rise within an electronic device.

[Prior Art and Problems to be Solved by the Invention] A cooling fan is used to prevent a temperature rise inside an electronic device, but if a failure occurs in this cooling fan and it stops, the electronic circuit The device is powered off to protect it from rising temperatures.

In order to prevent equipment operation rates from decreasing due to this disconnection, conventionally several cooling fans necessary for cooling have been installed and rotated, and even if a failure occurs in any of them, the IT source can be Multiplexing of cooling fans has been adopted to allow the device to operate without being disconnected, but there is a problem in that the rotation of a large number of cooling fans increases noise.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a highly reliable cooling method that improves noise generation.

[Means to solve the problem]

In FIG. 1 - Structure diagram of the embodiment, 1a and 1b are cooling fans arranged as a set of two, each having a controllable rotation speed and capable of cooling an object to be cooled at a predetermined rotation speed; 3 is a monitoring unit that monitors abnormalities in the cooling fans la and lb; 3 is a rotational speed control unit that controls the rotational speed of the cooling fans 1a and 1b, respectively.

[For production]

Two cooling fans la and lb are set as a pair,
They are arranged so as to be cooled at one-half rotation of a predetermined number of rotations (hereinafter referred to as full rotation).

The monitoring unit 2 monitors the operation of the cooling fans 1a and 1b,
When a failure occurs in one of the cooling fans and it stops, this is detected and notified to the rotation speed control section 3, and the rotation speed control section 2 controls the rotation speed of the other cooling fan to full rotation. .

As a result, even if one of them stops, a predetermined amount of cooling air can be obtained from the other, so the operation of the device can be continued. Furthermore, since the fan is normally operated half a rotation, the increase in noise due to the addition of a cooling fan can be alleviated.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment, and FIG. 2 is a diagram showing an example of the arrangement of cooling fans. In Figure 1, cooling fan l
a and lb are a control motor whose rotation speed can be controlled, a control circuit that controls the rotation speed to full rotation or half rotation according to instructions, and a sensor circuit that outputs a pulse (rotation speed pulse) with a width corresponding to the rotation speed. (not shown), and normally supplies enough air volume to cool the object to be cooled during full rotation. The cooling fans 1a and 1b are arranged as a pair at a predetermined position.

The monitoring section 2 monitors the rotation speed pulses output by the cooling fans 1a and 1b, and notifies the rotation speed control section 3 when an abnormality such as a stop is detected.

The rotation speed control section 3 outputs a half-rotation instruction to the cooling fans la and lb during normal operation, and outputs a full-rotation instruction to one of the normal cooling fans in response to an abnormality notification from the monitoring section 2.

The power supply unit 4 supplies power to the cooling fans la, 11).

FIG. 2 shows an example of the arrangement of cooling fans la, lb and cooling fans 5a, 5b as a pair to cool a plurality of printed circuit boards 6. The arrangement is such that it is sufficient to rotate the two cooling fans at full speed.

Note that this arrangement is similar to the conventional arrangement in the case of full rotation multiplexing.

In such a configuration and arrangement, the monitoring unit 2 monitors the rotation speed pulses output by the cooling fans la, lb, 5a, and 5b, and notifies the rotation speed control unit 3 when it detects a cooling fan that has stopped abnormally. .

The rotation speed control unit 3 outputs a full rotation instruction to the other cooling fan that is a pair of the cooling fan in which the failure has occurred. W-chi,
When the cooling fan 1a stops, a full rotation instruction is output to the cooling fan 1b (or vice versa), and when the cooling fan 5a stops, a full rotation instruction is output to the cooling fan 5b (or vice versa).

Therefore, the device can continue to operate until at least the two cooling fans in the pair stop.

As described above, the present invention arranges two cooling fans as a pair, normally operates them at half rotation, and when one of them stops abnormally, the other rotates at full rotation, so it is reliable with less noise. It is possible to provide a highly efficient cooling system.

It is a figure showing the example of arrangement|positioning of Ann.

In the figure, la, 1b+5a+5b are cooling fans, 2 is a monitoring section, 3 is a rotation speed control section, 4 is a power supply section, and 6 is a printed board.

Claims (1)

[Scope of Claims] A set of two cooling fans (1a, 1b) whose rotational speed can be controlled and which can cool an object to be cooled at a predetermined rotational speed are arranged, and the cooling fans (1a, 1b) ), and a rotation speed control section (3) that controls the rotation speed of the cooling fans (1a, 1b), respectively. They are arranged as a set of two and each is operated at a rotation speed of one-half of the predetermined rotation speed, and when the monitoring section (2) detects an abnormal stop of one of the cooling fans, the rotation speed is increased. Control part (3)
controls the other cooling fan to the predetermined rotation speed.