JPS583165A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To make effective cooling, by circulating the air in the device through a heat exchanger, in a magnetic device of an tightly enclosed construction. CONSTITUTION:The air in a disc device warmed with the generated heat due to the rotation of a disc 2 is delivered to a heat exchanger 6 through a duct 5 with an air flowing outlet 8 provided in the vicinity of the external circumference of the disc of an enclosure 1 accompanied with the disc. On the other hand, the external air is drawn in with a fan 7 located aside the heat exchanger and led into the heat exchanger 6. The air in the device taking its heat and cooled with the external air is returned in the disc enclosure from an air flowing inlet 9. Thus, the temperature rise in the disc device is suppressed to a prescribed temperature and the value is depending on the performance of the heat exchanger 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling method for a magnetic disk device, and in particular, to efficiently cool a magnetic disk device with a sealed structure using an air-to-air heat exchanger with a small and simple configuration. Regarding the cooling method.

The air circulation system of conventional magnetic disk drives sends outside air through a filter into the disk enclosure.
There are methods that purify the air inside the equipment, and methods that completely seal the equipment to prevent dust from entering.The former prevents temperature rise to some extent, but what about the equipment itself? The latter has the disadvantage that the temperature rise is large, especially in devices where the disk has a large diameter and the disk rotation speed is high.

A magnetic disk rotating at high speed generates a considerable amount of heat due to friction with the air, so unless it is effectively cooled, the temperature will rise, resulting in an increase in off-track due to thermal expansion, making it impossible to guarantee high-density recording. This will cause serious problems such as shortened equipment life and reduced reliability.

Therefore, an object of the present invention is to provide a magnetic disk drive having a simple sealed enclosure structure, in which the air inside the enclosure can be effectively cooled by a cooling means with a simple structure, thereby reducing off-track and lengthening the device. The goal is to extend the service life and improve reliability.
In particular, the configuration of the cooling system is made compact and simple.

A magnetic disk device according to the present invention includes a disk enclosure that hermetically houses a magnetic disk and a cooling heat exchanger, and has a closed flow path in which air in the disk enclosure circulates via the heat exchanger. What was configured?
t-characteristic, and furthermore, the air outlet from the disk enclosure to the heat exchanger is arranged near the outer periphery of the disk, and the air inlet from the heat exchanger is arranged near the center of the disk, so that the enclosure generated by the rotation of the disk The present invention is characterized in that air circulation in the closed flow path is performed by a pressure difference in the internal air. This will be explained in detail below based on examples.

FIG. 1 is a block diagram showing a cooling method for a magnetic disk device using a heat exchanger according to the present invention. There are two disks inside the reeds of the IFi disk enclosure cover. Also, the head, arm, body, etc. (as shown) are attached. The disk 2 is connected to a spindle motor (path shown) via a pulley 3 and a belt 4, and rotates at high speed. As the disk rotates, the air inside the disk device heated by the heat generated by the disk 20 rotation flows through the air outlet 8 provided near the outer periphery of the disk in the enclosure 1.
It is sent to a heat exchanger 6 through a duct 5. On the other hand, outside air is drawn into the heat exchanger 8 by a fan 7 placed next to the heat exchanger. The air inside the device, which has been cooled by removing heat from the outside air, returns into the disk enclosure through an air inlet 9 provided near the disk center of the enclosure 1. Therefore, the temperature rise of the air inside the disk device is suppressed to a certain constant temperature, and the value is
0 performance dependent.

FIG. 2 shows one example of the structure of the heat exchanger.

Thin metal flat plates 10 (made of steel or aluminum) are stacked perpendicularly to each other, and the air inside the device and the outside air are separated from each other by the flat plates 10 and 10 (in the figure, they are spaced apart for convenience). The structure is such that the waves flow perpendicularly to the direction of the arrows along the corrugated plates 11 of the same kind of metal sandwiched between the plates 10 and 10 without mixing with each other. When a heat exchanger with this structure and a heat transfer area of 2Tn2 is installed in a disk device with 11 14-inch disks and 9 rotations at 280 rpm, the temperature rise can be suppressed to 10° C. or less.

The present invention described above is applicable to all types of magnetic disk drives having a sealed structure. In FIG. 1, the outlet of the air inside the device is located on the side of the cover 1, but the outlet is not limited to this position.

As an application example of the present invention, for example, if an air flow guide is provided inside the disk enclosure, the flow rate flowing to the heat exchanger will be increased and the cooling effect will be increased.Also, the external fan 7
Instead, the device can be simplified by connecting the fan directly to the spindle motor. If a spacer ring 12 with holes is used, the exchange of air between the disks will be smooth, and this will have the effect of promoting uniformity of the temperature of the air inside the device in the direction of the rotation axis of the disks.

FIG. 2 shows an example of the structure of a heat exchanger used in the present invention. A heat exchanger having a structure other than the slotted structure can also be used as long as the two airs do not mix.

According to the present invention, it is possible to effectively suppress the temperature rise of the magnetic disk device, thereby extending the life of the magnetic disk device and improving its reliability. It also has the effect of reducing off-track and making it possible to increase the recording density of the magnetic disk device. Then, as in the above embodiment, if the air is circulated through the heat exchanger by utilizing the pressure difference within the device generated by the rotation of the disk,
There is no need to provide a fan for circulation, and the inherent advantages of the sealed magnetic disk device, which are small and simple in structure, are not hindered, so the practical effects of the present invention are very large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the structure of a heat exchanger used in the embodiment of the present invention. 1. Disk enclosure. 2... Disc. 5...Duct. 6...Heat exchanger〇-7- Figure 2 ＼

Claims (1)

[Claims] 1. A disk enclosure that hermetically accommodates a magnetic disk and a cooling heat exchanger, and has a closed flow path in which air in the disk enclosure circulates via the heat exchanger. A magnetic disk device characterized by comprising: 2. The air outlet from the disk enclosure to the heat exchanger is arranged near the outer periphery of the disk, and the air inlet from the heat exchanger is arranged near the center of the disk to reduce the amount of air inside the enclosure generated by the rotation of the disk. Air circulation in the closed flow path is performed by pressure difference f:4? A magnetic disk device according to claim 1, characterized in that: