JP2003008272A - Dust-preventing filter-mounted electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backup filter having a simple structure. SOLUTION: The electronic apparatus, having a dust-preventing filter with a normal filter and a reserve filter for backing up the usual filter in the event of contamination thereof, comprises a dust proofing filter 2 provided on a first surface of an outside air intake chamber, a dust proofing reserve filter 4 provided on a second surface of the intake chamber, an ink-apparatus cooling fan 1 for sucking outside air from the filter 2 or the reserve filter 4 for sending dust-removed air into the apparatus, and a partition plate 6 pressed by a spring 7 to the inside of the reserve filter 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof filter-equipped electronic device, and more particularly to a dustproof filter-equipped electronic device such as a radio base station.

[0002]

2. Description of the Related Art In an engine oil filter used in an automobile, when the engine speed increases and the oil amount increases, or when the filter element is clogged and the filtration efficiency decreases, the engine oil is filtered. It has a mechanism that bypasses the element, and avoids the engine to stop for the time being, for example, seizure of the engine sliding part due to deterioration of the cooling action, etc., even if there is a risk of reducing the engine life in the long run. ing. (See, for example, JP-A-58-000210).

In order to reduce this risk (shortening of engine life, occurrence of failure) to some extent, there is a bypass mechanism to which a small-scale redundant portion is added. 60-60959
According to the publication No. 11, a relief filter having a coarser mesh than the filter element is provided in a relief valve that bypasses the filter element to prevent foreign matter from reaching a sliding portion and promoting wear.

In Japanese Utility Model Laid-Open No. 02-081608, an auxiliary filter element is installed in the middle of a filter circuit of an oil filter assembly.

In an electronic device that frequently uses heat-generating components such as IC and LSI, outside air is introduced into the housing through a dustproof filter to cool the heat-generating components by air.

A conventional electronic device equipped with a dustproof filter will be described in detail with reference to the drawings.

FIG. 3 is a sectional view showing a first conventional example.
(For example, refer to Japanese Utility Model Laid-Open No. 03-041996). The dust-proof filter-equipped electronic device shown in FIG.
By rotating the fan to forcibly cool the heat generating portion 102 in the housing by taking in air from the outside of the electronic device housing 101, and rotating the fan 106 in the reverse direction to switch the blowing direction of the fan 106. The dust 108 adhering to the filter 105 is removed.

In the conventional cooling fan, only one mesh filter is fixedly attached to the intake side of the cooling fan, so that periodic replacement or cleaning of the filter against time clogging is required. Maintenance work was required.

If maintenance and inspection work such as periodical replacement and cleaning is neglected, insufficient cooling and abnormal heat generation of the device are caused due to insufficient air flow due to clogging of the filter.

Further, if a coarse filter is used in order to reduce the number of regular maintenance and inspection work and to ensure the ventilation volume even if there is some clogging, dust and the like will be left in the electronic device. Dust may flow in and cause a secondary electrical failure.

FIG. 4 is a sectional view showing a second conventional example.
(For example, refer to Japanese Utility Model Laid-Open No. 03-041996).

In the dust-proof filter-mounted electronic device shown in FIG. 4, 201 is a fan, 202 is a roll-shaped filter, and 20 is a roll-shaped filter.
2a is a filter housing portion, 203a is an intake port, 203b is an exhaust port, 204 is an air flow sensor, 205 is a control unit, 20
Reference numeral 6 is a filter winding motor, 207 is a filter winding body, 207a is a filter winding storage portion, and 209 is a filter protection wire mesh.

The rotation of the fan 201 causes the intake port 203a.
The outside air sucked from is sucked through the exposed portion 202b of the roll-shaped filter 202 facing the intake port 3a,
It is sent into the apparatus main body 208 from the exhaust port 203b.

At this time, the flow rate of the intake air is monitored by the ventilation sensor 204. And roll filter 2
If dust, dust or the like adheres to the exposed portion 202b of No. 02 with time and becomes clogged, the ventilation amount decreases.

When the ventilation amount sensor 204 detects the decrease in the ventilation amount, a signal is sent to the control unit 205. Control unit 2
05 receives the signal from the air flow rate sensor 204 and drives the filter winding motor 206.

The filter winding motor 206 rotates the filter winding body 207 to rotate the roll-shaped filter 202.
Is wound up in the filter winding housing 7a, the clogged portion is removed from the intake port 203a, and a new filter is sent to the intake port 203a from the roll-shaped filter 202.

FIGS. 5A and 5B are sectional views showing a third conventional example. (See, for example, Japanese Utility Model Laid-Open No. 04-015293). In the figure, 301 is a case and 310 is a cover attached to the left side of the case 301. A normal filter 309 is a filter that is attached to the cover 310 and should be normally used. Reference numeral 302 denotes an emergency filter, which is attached by the lower left side frames 303a and 303b of the case 301.

A movable plate 304 has a frame 303 at its left end.
The ventilation surface of the emergency filter 302 can be shielded and exposed by being attached to a via a hinge 303c and rotating counterclockwise around the right end.

An actuator 305 for the movable plate 304 blocks the ventilation surface of the emergency filter 302 by the movable plate 304 when the internal temperature of the case 301 is lower than a set value, and when the internal temperature of the case 301 is equal to or higher than the set value, the movable plate 304 is provided with the emergency filter 302. Operates to expose the ventilation surface.

That is, the actuator 305 has the wires 306a, 3 fixed to the upper and lower ends thereof.
One side is connected to the intermediate plate 308 and the other side is connected to the movable plate 3 via 06b.
It is connected to the right end of 04. As shown in FIG. 6, the actuator 305 includes a holding frame 312 and a shape memory alloy spring 31.
3 and bias spring 314. The shape memory alloy spring 313 is a tension spring whose shape is shortened when the internal temperature reaches a set value, and the bias spring 314 is a normal tension spring whose initial length is shortened. is there.

Shape memory alloy spring 313 and bias spring 3
The ends of the shape memory alloy spring 14 are connected to each other, the lower wire 306b is connected to this connecting portion, and the upper wire 306a is connected to the upper end of the shape memory alloy spring 313. The shape memory alloy spring 313 and the bias spring 314 form the holding portion 312.
Stored and held in.

Therefore, when the internal temperature is less than the set value, the shape memory alloy spring 313 is pulled by the bias spring 314 to be in the state as shown in FIG. 6, and the emergency filter 302 ventilation surface is shielded to perform the filter function. It corresponds to a state where it is not exhibited (see FIG. 1 (a)).

When the internal temperature exceeds the set value, the shape memory alloy spring 313 is shortened to pull the lower wire 306b, and the ventilation surface of the emergency filter 302 shown in FIG. 1 (b) is exposed to exert the filter function. Corresponding to the state.

The temperature switch 307 is attached to the lower surface of the intermediate plate 308, and activates an alarm (not shown) when the internal temperature exceeds a specified value.

[0025]

The above-described conventional electronic device equipped with a dustproof filter has a problem that the structure of the spring made of a shape memory alloy is complicated.

[0026]

According to a first aspect of the present invention, there is provided a dust-proof filter-equipped electronic device, comprising: a dust-proof filter-equipped electronic device having a normal filter and a backup filter for backing up when the normal filter is contaminated. A dustproof filter provided on the first surface of the suction chamber, a dustproof auxiliary filter provided on the second surface of the outside air intake chamber, and a device for sucking outside air from the dustproof filter or the dustproof auxiliary filter. It is configured to include an in-apparatus cooling fan that sends out dust-removed air, and a partition plate that is pressed against the inside of the dust-proof auxiliary filter by a spring.

A dustproof filter-equipped electronic device according to a second aspect of the present invention is the electronic device according to the first aspect, further comprising a mechanical limit switch that operates when the partition plate is sucked into the suction chamber.

In the dustproof filter-equipped electronic device of the third invention, in the first invention, the spring is conditioned so as to automatically contract when the internal temperature of the suction chamber increases.

In the dustproof filter-equipped electronic device of the fourth invention, in the first invention, the partition plate is moved parallel to the surface of the dustproof auxiliary filter and is separated therefrom.

According to a fifth aspect of the present invention, there is provided a dustproof filter-equipped electronic device according to the first aspect, wherein the partition plate is inclined and separated from the surface of the dustproof auxiliary filter.

In the electronic device equipped with a dustproof filter of the sixth invention, in the first invention, the air permeability of the dustproof auxiliary filter is made higher than that of the dustproof filter.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings.

FIGS. 1A and 1B are sectional views showing an embodiment of the present invention. 1 (a) and 1 (b) is a dustproof filter-equipped electronic device having an ordinary air filter and a backup filter for backup in the case where the normal filter is contaminated. A dustproof filter 2 provided on the first surface and a dustproof auxiliary filter 4 provided on the second surface of the outside air suction chamber.
An in-apparatus cooling fan 1 for drawing in outside air from the dustproof filter 2 or the dustproof auxiliary filter 4 and delivering dedusted air to the inside of the apparatus, and the dustproof auxiliary filter 4
And a partition plate 6 pressed by a spring 7 on the inside.

A mechanical limit switch 8 is provided which operates when the partition plate 6 is sucked into the suction chamber. Further, the spring may be conditioned so as to automatically contract when the internal temperature of the suction chamber increases.

The partition plate 6 is moved in parallel with the surface of the dustproof auxiliary filter 4 and is separated therefrom, as shown in FIG.
As shown in (b), the partition plate 6 may be inclined and separated from the surface of the dustproof auxiliary filter 4.

If the air permeability of the dustproof auxiliary filter 4 is made higher than that of the dustproof filter 2, even if the dustproof filter 2 becomes clogged, the amount of intake air is not reduced. That is, the energy required for the internal cooling fan 1 to move the partition plate 6 against the pressing force of the spring can be reduced.

The partition plate 6 is attached to the interface plate 9 in a part of the apparatus via a spring 7, and has a function of opening and closing the suction port B5.

Further, the mechanical switch 8 attached to the interface plate 9 has a function of detecting the opening / closing operation of the partition plate 6 to the suction port B5, and warns the replacement (cleaning) of the dustproof filter 2. It is possible to do.

In a normal state where the dustproof filter 2 is not clogged, the suction force of the in-apparatus cooling fan 1 allows air to flow in through the intake port A3 and suppress the temperature rise in the apparatus.

When the dust filter 2 that is used properly is clogged and the pressure loss exceeds the allowable value, the spring 7
The partition plate 6 moves to the inside of the apparatus through the opening, the intake port 5 is opened, and the air can flow in through the intake port B5 through the dustproof preliminary filter 4. By this operation, even when the dustproof filter 2 is clogged and a pressure loss more than the allowable level in consideration of the thermal influence in the device occurs, the temperature rise in the device can be suppressed as in the normal state. Becomes

When the partition plate 6 moves inside the device, the mechanical limit switch 8 detects the movement.

The mechanical limit switch 8 can issue a warning that the intake port B5 has been opened, that is, that the dustproof filter 2 has been set.

The suction port B5 is provided with the dustproof preliminary filter 4 and does not suck dust into the apparatus.

The dustproof filter 2 which is clogged
Before the clogging of the dustproof preliminary filter 4 progresses beyond the allowable level, the dustproof preliminary filter 4 can be cleaned to bring it into a normal initial state. When the dustproof filter 2 is in a normal state, the pressure loss becomes normal, the partition plate 6 is moved to the outside of the device by the spring 7, and the suction port B5 is closed.

By cleaning the dustproof preliminary filter 4 in this state, it becomes possible to return the apparatus to a normal state without downtime of the apparatus.

[0046]

The dustproof filter-equipped electronic apparatus of the present invention has the effect that downtime of the apparatus can be eliminated by simply adding a simple mechanism.

[Brief description of drawings]

1A and 1B are cross-sectional views showing a first embodiment of the present invention.

2A and 2B are sectional views showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a first conventional example.

FIG. 4 is a sectional view showing a second conventional example.

5A and 5B are cross-sectional views showing a third conventional example.

FIG. 6 is a side view showing details of an actuator 305.

[Explanation of symbols]

1 In-device cooling fan 2 Dustproof filter 4 Dustproof preliminary filter 6 partition boards 7 spring 8 Mechanical limit switch

Claims (6)

[Claims] 1. A dustproof filter-equipped electronic device having a normal filter and a backup filter for backing up when the normal filter is contaminated, wherein the dustproof filter provided on the first surface of the outside air suction chamber and the outside air are provided. A dust-proof auxiliary filter provided on the second surface of the suction chamber, an in-device cooling fan that sucks outside air from the dust-proof filter or the dust-proof auxiliary filter, and sends out dedusted air to the inside of the device, and the dust-proof An electronic device equipped with a dust-proof filter, characterized in that it includes a partition plate which is pressed against the inside of a spare filter for use by a spring. 2. The dust-proof filter-equipped electronic device according to claim 1, further comprising a mechanical limit switch that operates when the partition plate is sucked into the suction chamber. 3. The dust-proof filter-equipped electronic device according to claim 1, wherein the spring is made of a shape memory alloy that is automatically contracted when the internal temperature of the suction chamber increases. 4. The dust-proof filter-equipped electronic device according to claim 1, wherein the partition plate moves parallel to and separates from the surface of the dust-proof auxiliary filter. 5. The electronic device equipped with a dustproof filter according to claim 1, wherein the partition plate is inclined and separated from the surface of the dustproof auxiliary filter. 6. The dust-proof filter-equipped electronic device according to claim 1, wherein an air permeability of the dust-proof spare filter is made higher than that of the dust-proof filter.