CN1790152A

CN1790152A - Apparatus and method for self-removing dust

Info

Publication number: CN1790152A
Application number: CN 200410082033
Authority: CN
Inventors: 许年辉
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2004-12-17
Filing date: 2004-12-17
Publication date: 2006-06-21

Abstract

The invention discloses a self-dusting device, which consists of fan and control part, wherein the fan lies in the projector, which exchanges the inlet and outlet direction due to changing the rotary direction of fan; the controller connects the fan to drive the fan, which controls the rotary direction of fan; the flabellum rotates at the first rotary direction to guide the cooling air into the projector, which discharges the heat out of the projector in the image displaying condition; the controller drives the flabellum to display the second rotary direction in the projector non-working condition, which exchanges the inlet and outlet direction to change the flow direction and character of normal inlet and outlet flow field.

Description

Oneself's dust arrester and method thereof

Technical field

The invention relates to a kind of projector, particularly about a kind of self-dust arrester of projector.

Prior art

Shown in Figure 1A, the cooling structure of conventional projector 10, be that air inlet 11 and air outlet 12 are arranged on projector's housing 13, and a desk fan 14 is set between air inlet 11 and air outlet 12, by fan 14 cooling air is sucked into cooling power supply unit 15 in the housing 13 by air intake opening 11, cooling air is directed to cooling bulb 16 then, and is last, and cooling air is discharged outside the housing 13 by air outlet 12.

Shown in Figure 1B, because the air of fan 14 suction side (i.e. a side of contiguous air inlet 11) 141 is stable laminar flows (Laminar flow), and exhaust side (promptly contiguous air outlet 12 1 sides) the 142nd, the turbulent flow (Turbulent flow) with rotation (Swirl) effect, because its boundary layer of laminar flow (Boundary layer) is thicker, therefore will cause the dust of carrying secretly in the air to be easy to be deposited on gradually on the fan 14 and the element that is arranged on its suction side 141 (for example: power supply unit 15); The amount long-pending along with dust dirt increases, to reduce the thermal resistance of fan efficiency and lifting power supply unit 15 and cause heat radiation bad, therefore, projector then need remove the laying dust on fan 14 or the power supply unit 15 after use a period of time, generally speaking, utilize dismounting projector housing 13 to remove laying dust, but this mode is along with the dwindling of projector's volume and inner space, and the difficulty that more and more seems; In addition, filter screen (figure does not show) also can be set at the air inlet 11 of projector 10 filter the cooling air that enters in the projector 10, enter in the projector to reduce dust, but being provided with of filter screen causes air mass flow to reduce easily, therefore need to utilize the lifting rotation speed of the fan to promote flow, but this problem that will follow noise to produce.Therefore, how effectively to remove the dust in the projector, await the research staff solution is provided.

Summary of the invention

One object of the present invention provides a kind of self-dust arrester, does not need to dismantle projector's housing, can discharge outside the projector attached to the dust of projector's inner member, reaches the effect of dedusting.

To achieve these goals, self-dust arrester of the present invention comprises a desk fan and a controller, and fan is positioned at a projector inside, comprises flabellum and turns to a variable desk fan, by changing turning to of flabellum, make and fan aspiratedly intercourse with direction exhaust.Controller is electrically connected with fan, is used for drive fan, and the turning to of control flabellum.Usually using under the situation of projector's show image, flabellum is to rotate with first sense of rotation, and the guiding cooling air enters projector inside, when flowing through element, takes away the heat of element, discharges outside the projector.Under the situation of not using projector, rotate with second sense of rotation with the controller drives flabellum, make direction exchange fan aspirated and exhaust, change the flow direction and the characteristic in common suction side and common exhaust side flow field, thereby the adhesion of the dust on the destruction element is discharged dust outside the projector with blast.

The accompanying drawing summary

For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent more, a preferred embodiment cited below particularly, and conjunction with figs. is described in detail as follows:

Figure 1A is the synoptic diagram of the cooling structure of conventional projector;

Figure 1B is suction side and the flow field of exhaust side and the characteristic synoptic diagram of the flow direction of conventional fan;

Fig. 2 is the control block diagram of the present invention oneself dust arrester;

Fig. 3 is the control flow chart of the present invention oneself dust arrester;

Fig. 4 be the present invention oneself dust arrester under the show image state, the characteristic synoptic diagram of the suction side of fan and the flow field of exhaust side and the flow direction; And

Fig. 5 be the present invention oneself dust arrester under the dedusting state, the characteristic synoptic diagram of the suction side of fan and the flow field of exhaust side and the flow direction.

Embodiment

Below will clearly demonstrate spirit of the present invention with accompanying drawing and detailed description, as the person skilled in the art after understanding the preferred embodiments of the present invention, should be by the technology that goes out shown in the present, changed and revised, this does not depart from the scope of the present invention.

As Fig. 2 and shown in Figure 4, self-dust arrester of the present invention comprises an aerofoil fan 600, a controller 700 and a starting element 500.Aerofoil fan 600 is positioned at projector 900 inside, aerofoil fan 600 comprises a common suction side 610, a common exhaust side 620, the flabellum 630 of a variable steering, a working coil 640 and a rotor 650, drive flabellum 630 rotates by means of the effect of working coil 640 and rotor 650, make flabellum 630 that first sense of rotation and second sense of rotation are provided, the direction of the air-breathing and exhaust of first sense of rotation and second sense of rotation is intercoursed, first sense of rotation is for just changeing in the present embodiment, second sense of rotation is reverse, and common suction side 610 and common exhaust side 620 are meant suction side and the exhaust side of aerofoil fan 600 when projector is cooled off; Controller 700 is electrically connected with aerofoil fan 600, be used for driving shaft flow fan 600, and the sense of rotation of control flabellum, controller 700 comprises a sensing element 710, is connected to one first control loop 720 and one second control loop 730 of sensing element 710; Starting element 500 is connected to controller 700, and with the sensing element 710 that provides to control signal to controller 700, control signal is to produce by touching OSD (On-Screen Display) interface, button or telepilot.

See also Fig. 3 and shown in Figure 4, be in when projector under the situation of show image, start projector and do not touch starting element 500, at this moment, sensing element 710 does not receive control signal, therefore drive first control loop 720, make aerofoil fan 600 flabellums be first sense of rotation and rotate, the guiding cooling air enters projector 900 inside, when flowing through circuit or optical element 800, after taking away the heat of circuit or optical element 800, discharge outside the projector 900, reach the purpose of cooling projector.

When entering projector 900 inside along with cooling air, dust also is inhaled into projector 900 inside, be inhaled into projector 900 inside dust can be because usually suction side 610 be laminar flow and border bed thickness, gradually on the air draught face blade that is deposited on projector 900 inside and fan 600, therefore, after projector 900 uses a period of time, promptly need carry out self-dedusting pattern.

Carry out self-dedusting pattern, be when stopping using projector, touch starting element 500 and produce a control signal, after the sensing element 710 induction control signals, drive 730 work of second control loop, working coil 640 is generated an electromagnetic field, drive flabellum 630 with rotor 650 and be the rotation of second sense of rotation, thereby change the flow field (as shown in Figure 5) of fan 600 its common suction side 610 and common exhaust side 620, air is sucked air in the projector 900 by common exhaust side 620, by common suction side 610 air is discharged outside the projector again, because this moment, suction side 610 was the thin turbulent flow in boundary layer usually, and exhaust side 620 is the laminar flow of border bed thickness usually, the thin characteristic that reaches sinuous flow in the boundary layer that therefore can utilize turbulent flow to have, destroy the adhesion of dust, dust is discharged outside the projector 900, thus the dust in the cleaning projector 900.

Therefore, self-dedusting method provided by the invention, do not need to utilize dismounting projector housing to reach the removing laying dust, and only need be by changing the sense of rotation of fan, make direction exchange fan aspirated and exhaust, change the flow direction and the characteristic in common suction side and common exhaust side flow field, can reach dust removing effects, so cleaning can not be subjected to the restriction in space.

In addition, when aerofoil fan 600 flabellums are the rotation of second sense of rotation, suck cooling air from common exhaust side 620, also suck simultaneously dust, but because flabellum rotation of short time and low speed just to removing projector's 900 inner dusts, so the dust that suck this moment is also few, and when flabellum recovers the rotation of first sense of rotation, these will be blown outside the projector 900 by the dust that common exhaust side 620 sucks, therefore, utilize cleaning mode provided by the invention, can effectively reach the effect of cleaning dust.

By the invention described above preferred embodiment as can be known, use the present invention and have following advantage:

1, the dust of projector inside is discharged outside the projector, keeping the cooling effect of projector's inner member, and prevent that dirt is long-pending and problem that the short circuit that causes or thermal resistance promote.

2, need not dismantle projector's housing, only need to change the fan sense of rotation, the dust in the projector can be discharged outside the projector, reach the function of self-dedusting.

Though the present invention has used a preferred embodiment openly as above; yet this is not to be used for limiting the present invention; any technician of this area; without departing from the spirit and scope of the present invention; should make various variations and modification, thus protection scope of the present invention should with enclose later claims were limited is as the criterion.

Claims

1, a kind of self-dust arrester comprises at least:

An aerofoil fan is positioned at a projector inside, and this aerofoil fan comprises the flabellum of a variable steering, so that first sense of rotation and second sense of rotation to be provided;

A controller is electrically connected with this aerofoil fan, to drive this aerofoil fan; And

A starting element, be connected to this controller, to provide a control signal to this controller, when this controller receives this control signal, this aerofoil fan of this controller drives switches to this second sense of rotation by this first sense of rotation, thereby change the suction side of this aerofoil fan and the flow field of exhaust side, so that the dust in this projector is discharged outside this projector.

2, self-dust arrester as claimed in claim 1, wherein this first sense of rotation and second sense of rotation can be just to change and reverse.

3, self-dust arrester as claimed in claim 1, wherein this controller more comprises a sensing element, first control loop and second control loop that is connected to this sensing element, this aerofoil fan more comprises a working coil and a rotor, this sensing element is to be used for responding to this control signal, these control loops drive working coil according to this control signal and generate an electromagnetic field, and this rotor is rotated with first sense of rotation or second sense of rotation.

4, self-dust arrester as claimed in claim 1, wherein this starting element comprises a button.

5, self-dust arrester as claimed in claim 1, wherein this control signal produces by an OSD interface, button or telepilot.

6, a kind of self-dust collection method is applied to remove near the dust the suction side of a desk fan that is deposited on a projector, and this oneself's dust collection method comprises the following step at least:

Stop the normal use of this projector;

Touch a starting element, to produce a control signal; And

Switch the sense of rotation of this electric fan,, near the dust the suction side of this fan is discharged outside this projector to change this fan aspirated and direction exhaust.