JPH03173990A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the magnetic characteristics of a magnetic recording medium by providing a cooling pipe in a casing, cooling the casing by water, guiding cool air through a filter to the inside of a spindle valve and circulating this cool air. CONSTITUTION:When a cooler 10 is driven and cooling water is supplied to a cooling pipe 2, the cooling water once turns around the cooling pipe 2 and cools a casing 1. Afterwards, the cooling water is collected from an exit end 2o to the cooler 10, cooled again and afterwards supplied from a supply end 2i to the cooling pipe 2. The cool air to be supplied from the cooler 10 through a cool air supply pipe 9 is passed through an air filter 8, blown toward a bottom part 1a of the casing and guided to the inside of a spindle valve 3 along the bottom part 1a. The cool air is passed through a blow-out port 6 of the valve 3 and a blow-out port 7 of an interval ring 5 and blown out to an interval between respective magnetic media 4. The cool air blown out from the interval between the respective media 4 to the outer peripheral side is collected from the interval between the media 4 to the cooler 10, cooled again and afterwards supplied to the pipe 9.

Description

[Detailed Description of the Invention] [Summary] Regarding a magnetic disk device that can maintain a magnetic recording medium at an optimal temperature, the magnetic recording medium can be cooled forcibly and efficiently. For the purpose of improving the magnetic properties of the medium, a cooling pipe is installed in the casing of a device in which information is recorded/reproduced by a magnetic head on a plurality of magnetic recording media mounted on a spindle within the casing. the cool air is guided inside the spindle hub through an air filter provided on the side of the cold air supply inlet into the casing, and from the vent holes in the spindle hub and the spacing ring; Cool air is blown out between each magnetic recording medium; The cool air supplied to the inside of the cooling medium and the casing is collected, cooled by a cooler, and then supplied to the cooling pipe and the cold air supply pipe. The structure is characterized in that the piping is arranged as follows.

[Industrial application field]

The present invention relates to a magnetic disk device that can maintain a magnetic recording medium in a magnetic disk device at an optimal temperature.

(Prior Art) A magnetic disk device used as a file device in a computer system records/reproduces information by rotating a disk-shaped magnetic recording medium at high speed and seeking a magnetic head to a predetermined track. It will be done.

Magnetic recording media can be made of a coating type, which is made by mixing acicular magnetic powder with paint, applying it to a non-magnetic substrate, and baking it, or coating the magnetic material directly onto the non-magnetic substrate using methods such as sputtering or plating. It can be roughly divided into two types: thin film type.

Figure 4 shows the temperature and coercive force (l(c) of various magnetic recording media.
) is a diagram showing the relationship between This figure shows the temperature dependence of four types of magnetic recording media with different magnetic compositions, and the coercive force (Hc) of any magnetic recording medium decreases as the temperature rises. As described above, the magnetic properties of a magnetic recording medium deteriorate as the temperature rises.

[Problems to be Solved by the Invention] As described above, as the temperature rises, the magnetic properties of the magnetic recording medium deteriorate. The fins prevent the inside of the casing from overheating by dissipating heat into the atmosphere.

Furthermore, the magnetic disk drive is installed in an air-conditioned computer room so that heat can be effectively dissipated by the fins of the casing. However, as computers have become more widespread, they are not always installed in rooms that are air-conditioned to the optimum temperature, and they are sometimes used in places with poor temperature environments. Additionally, there are times when the air conditioning equipment does not work due to malfunctions or maintenance inspections.

Furthermore, even if the air conditioning is on, the magnetic recording medium inside the casing is heated due to the heat generated by the spindle motor and the power supply, and even during normal operation,
The temperature rises to around 'C. As a result, as is clear from the magnetic characteristics diagram in FIG. 3, when the temperature of the magnetic recording medium rises from the room temperature of 23° C. to 60″C, the magnetic characteristics deteriorate by as much as 10%.

A technical object of the present invention is to address such problems and to improve the magnetic properties of a magnetic recording medium by forcibly and efficiently cooling the magnetic recording medium.

[Means to solve the problem]

FIG. 1 is a conceptual diagram (cross-sectional view) illustrating the basic principle of a magnetic disk device according to the present invention. 1 is a casing, and a cooling pipe 2 is provided. Inside this casing 1, a plurality of magnetic recording media 4 are mounted on a spindle hub 3 by alternately stacking disk-shaped magnetic recording media 4 and spacing rings 5.

The spindle hub 3 and the spacer ring 5 have outlets 6.7 through which air can pass.

The casing 1 is provided with an air filter 8 on the side of the cold air introduction port 9i, and through the air filter 8, cold air is supplied into the casing 1 from an external cold air supply pipe 9.

The cooler 10 collects used cooling water (cooling medium) and cold air, cools them, and supplies them again to the cooling pipe 2 and the cold air supply pipe 9, and the outlet hO side of the cooling water is the cooling water. It is connected to the supply end 21 of the pipe 2, and the outlet end 2o of the cooling pipe 2 is connected to the cooling water recovery tip of the cooler 10.

Further, the cold air outlet AO side is connected to the cold air supply pipe 9, and the cold air recovery side At is connected to the inside of the casing 1 via the cold air recovery pipe 11.

Note that the cooling pipe 2 may be arranged so as to be wrapped around the outer wall of the casing 1, or may be embedded in the casing 1 and built into the thickness of the casing. As the cooling medium to be circulated through the cooling pipe 2, inexpensive and simple cooling water may be used, or a refrigerant such as fluorocarbon may be used.

[Function] In this device, when the cooler 10 is driven to supply cooling water (cooling medium) to the cooling pipe 2, it goes around the cooling pipe 2 and cools the casing l, and then the cooler 10 is supplied from the outlet end 2o.
After being collected and cooled again, it is supplied from the supply end 21 to the cooling pipe 2, and this operation is repeated. As a result, the casing 1 is constantly water-cooled, and the casing 1 is prevented from overheating due to external heat.

In addition, the cold air supplied from the cooler 10 through the cold air supply pipe 9 passes through the air filter 8 and is blown toward the casing bottom 1a as shown by the arrow, so it flows along the casing bottom 1a to the spindle hub 3. guided inside. Then, the air passes through the air outlet 6 of the spindle hub 3 and the air outlet lower of the spacing ring 5, and is blown out between the respective magnetic recording media 4. As a result, each magnetic recording medium 4.
... is cooled by cold air.

The cold air blown out from between the magnetic recording media 4... to the outer circumferential side is transferred from between the magnetic recording media 4... to the cold air recovery pipe 1.
1, the air is collected in the cooler 10, cooled again, and then supplied to the cold air supply pipe 9. This operation is repeated.

In this way, the magnetic recording medium 4 inside the casing 1 is cooled by the cold air. Further, as described above, since the casing 1 is cooled by the cooling pipe 2 and the temperature of the casing 1 is prevented from rising, the magnetic recording media 4 . . . are reliably maintained at an optimum temperature.

Note that the cooling temperature of the magnetic recording medium can be set by controlling the cooling capacity of the cooler 10 with the temperature controller 12. Alternatively, it is also possible to adjust the opening degree of the valve V provided in the cold air supply pipe 9.

〔Example〕

Next, how the magnetic disk device according to the present invention is actually implemented will be explained using examples. The device of the present invention includes:
Although the cooler 10 may be provided for each magnetic disk device, in a system using multiple magnetic disk devices,
As shown in FIG.
By connecting the cooling water outlet end 20 and cold air recovery pipe 11 of each magnetic disk device to the cooling water outlet end 20 and the cold air recovery pipe 11 of each magnetic disk device, cooling of one unit is possible. The machine 10 can cool a plurality of magnetic disk devices.

FIG. 2 is a sectional view showing an embodiment of a portion that blows out cold air from within the spindle hub, and FIG. 3 is a perspective view of the spindle hub. As shown in FIG. 3, the spindle hub 3 is formed into a cylindrical body, and has a plurality of protrusions 13 formed in the axial direction on its outer circumference. A cold air outlet 6 is provided in the recess 19 between each of the protrusions 13. Also, at the bottom,
A flange 14 is formed.

As shown in FIG. 2, this spindle hub 3 is fixed to the spindle 15, and the flange 14 of the spindle hub 3
Magnetic recording media 4 and spacing rings 5 are alternately stacked on top, and are fixed by tightening a disk-shaped clamper 16 at the upper end with a screw 17.

Therefore, the motor M connected to the spindle 15 rotates the magnetic recording medium 4 at high speed, and the magnetic head 18 can record/reproduce information.

The spindle hub 3 has concave grooves 19 between each convex line 13...
The inside and outside are communicated by a blow-off port 6 formed in the spacer ring 5, and each spacing ring 5 has a lower blow-out lower part for blowing cold air. Therefore, in the stacked state as shown in FIG. 2, the cold air guided to the inside of the spindle hub 3 flows as shown by the arrow in FIG. Concave groove 1 between rows 13 and 13
9 → Lower balloon of spacing ring 5 → Magnetic recording medium 4.4
The cold air is supplied between the magnetic recording media 4 and cooled by the cold air.

In this way, cold air is supplied into the casing 1 to cool the magnetic recording medium, and cooling water is supplied to the casing 1.
By water-cooling the magnetic recording medium, for example, 23°
Assuming that it is cooled to C, the coercive force is significantly improved, as is clear from the characteristic diagram in FIG.

〔Effect of the invention〕

As described above, according to the present invention, a cooling pipe is provided in the gauging to circulate a cooling medium such as cooling water, and cool air is guided to the inside of the spindle hub through a filter, thereby allowing the passage of air between the spindle hub and the spacing ring. The structure is such that cold air is blown out between each magnetic recording medium from the pores. Further, the cooling water and the cold air supplied to the inside of the casing are collected, cooled by a cooler, and then supplied to the cooling pipe and the cold air supply port.

In this way, since the casing 1 is water-cooled, it is possible to prevent heating from the outside, and each magnetic recording medium 4 is cooled by the cold air blown from the inside of the spindle hub 3. This greatly improves the magnetic properties and improves the reliability of magnetic disk drives. Additionally, it can be used in places with harsh temperature environments, further contributing to the spread of computer systems.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram explaining the basic principle of a magnetic disk drive according to the present invention. FIG. 2 is a sectional view showing an embodiment of a cold air blowing part. FIG. 3 is a perspective view showing an embodiment of a spindle hub. FIG. 4 is a diagram showing the temperature dependence of the magnetic properties of a magnetic recording medium. In the figure, 1 is a casing, 2 is a cooling pipe, 3 is a spindle hub, 4 is a magnetic recording medium, 5 is a spacing ring, 6.7
is a cold air outlet, 8 is an air filter, 9 is a cold air supply pipe, ■ is a valve, 1o is a cooler, 11 is a cold air recovery pipe,
Reference numeral 13 indicates a convex strip, 15 indicates a spindle, and 19 indicates a concave groove.

Claims (1)

[Claims] In an apparatus in which a magnetic head records/reproduces information on a plurality of magnetic recording media mounted on a spindle within a casing, the casing (1)
A cooling pipe (2) is provided in the casing (1) to circulate the cooling medium, and the spindle hub (
3), and the cold air is blown out between each magnetic recording medium (4) from the ventilation holes (6) and (7) of the spindle hub (3) and the spacing ring (5); The cooling medium and cold air supplied to the inside of the casing are collected, cooled by a cooler (10), and then piped to be supplied to the cooling pipe (2) and the cold air supply pipe (9). Features of magnetic disk device.