TWI411867B - Projector and airflow guiding device thereof - Google Patents

Abstract

An airflow guiding device, which is adapted to a projector, includes a guiding passage, a separating member, a first fan and a second fan. The guiding passage includes a first passage and a second passage, wherein the first passage has a first opening, the second passage has a second opening, and the first and second openings are located at opposite ends of the guiding passage. The separating member is disposed between the first and second passages. The separating member can be operated to selectively separate the first passage from the second passage or make the first passage communicate with the second passage. The first fan is disposed at the first opening and the second fan is disposed at the second opening.

Description

Projector and its airflow guiding device

The present invention relates to a projector, and more particularly to a projector having an airflow guiding device that can automatically remove filter dust.

Recently, the application of projectors has become more and more extensive. In addition to the conference reports used in general offices, the projectors are often used in various thematic discussions or academic courses due to their audiovisual playback capabilities. In general, projectors all have a cooling system that uses a fan to blow external airflow into the housing of the projector to cool the heat generated by the heat source (such as a light source, optical engine, etc.).

To prevent dust entrained in the air from entering the projector, a filter is usually placed near the airflow inlet and outlet of the projector. However, as the use time increases, the amount of dust deposited on the filter screen also increases, so that the airflow introduced by the fan becomes smaller, thereby reducing the heat dissipation efficiency of the fan. At this time, the user must remove the filter to clean or replace the new filter, which is not convenient for the user.

Therefore, one of the objects of the present invention is to provide a projector and a gas flow guiding device thereof, wherein the guiding channel of the airflow guiding device has a movable spacer, and when the projector is idle, the spacer can be operated to guide The two ends of the flow channel are turned on, and the airflow introduced by the fan is used to remove dust from the filter screen, thereby solving the above problem.

According to an embodiment, the airflow guiding device of the present invention comprises a guiding flow path, a spacer, a first fan and a second fan. The guiding flow channel includes a first flow channel and a second flow channel, wherein the first flow prop has a first opening, the second flow prop has a second opening, and the first opening and the second opening are respectively located in the guiding flow channel end. A spacer is disposed between the first flow path and the second flow path, and the spacer is operable to selectively isolate or conduct the first flow path from the second flow path. The first fan is disposed at the first opening, and the second fan is disposed at the second opening.

According to another embodiment, a projector of the present invention includes a housing, a screen, and an airflow guiding device. The housing has an air flow inlet and outlet, and the screen is disposed at the air flow inlet and outlet. The airflow guiding device is disposed in the housing. The airflow guiding device comprises a guiding flow channel, a spacer, a first fan and a second fan. The guiding flow channel includes a first flow channel and a second flow channel, wherein the first flow prop has a first opening, the second flow prop has a second opening, and the first opening and the second opening are respectively located in the guiding flow channel end. A spacer is disposed between the first flow path and the second flow path, and the spacer is operable to selectively isolate or conduct the first flow path from the second flow path. The first fan is disposed at the first opening, and the second fan is disposed at the second opening.

The spacer can be operated to isolate the first flow path from the second flow path while the projector is in operation. At this time, the first fan and the second fan simultaneously operate to introduce airflow into the housing of the projector via the first flow path and the second flow path, respectively, to dissipate heat. On the other hand, when the projector is idle, the spacer can be operated to make the first flow path and the second flow path conductive. At this time, the first fan can be operated first and the second fan is stopped, and the airflow introduced by the first fan is discharged through the air flow inlet and outlet of the casing through the first flow path and the second flow path, and the end of the filter is blown off. dust. After that, the first fan is stopped and the second fan is operated, and the airflow introduced by the second fan is discharged through the second flow channel and the first flow channel through the airflow inlet and outlet of the casing, and the dust at the other end of the filter is blown off. .

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Referring to FIG. 1 and FIG. 2, FIG. 1 is an external view of a projector 1 according to an embodiment of the present invention, and FIG. 2 is a bottom view of the projector 1 in FIG. As shown in FIG. 1, the projector 1 includes a housing 10 and a lens 12. The lens 12 is disposed in the housing 10 and exposed to the housing 10. In addition to the lens 12, the housing 10 is provided with optical components (not shown) for imaging, such as light source devices, optical modules, and the like. The light source device is configured to emit a light beam, and the light beam is processed by the optical module, and then projected and imaged through the lens 12. In practical applications, the optical module can be a so-called optical engine, including three liquid crystal panels of R, G, and B, and other necessary optical components. Since the imaging principle of the projector 1 can be easily achieved by those skilled in the art, no further details are provided herein.

As shown in Fig. 2, the casing 10 has an air flow inlet and outlet 100, and a screen 16 is disposed on the air flow inlet and outlet 100.

Please refer to FIG. 3 to FIG. 5 , FIG. 3 is an internal view of the projector 1 in FIG. 1 , FIG. 4 is a top view of the air flow guiding device 14 in FIG. 3 , and FIG. 5 is a fourth view in FIG. Front view of the airflow guiding device 14. Several components have been removed in Figure 3, such as a light source device, an optical module, and the like. As shown in FIGS. 3 to 5, the projector 1 further includes an airflow guiding device 14. The airflow guiding device 14 is disposed in the housing 10. The airflow guiding device 14 includes a guiding flow channel 140, a spacer 142, a first fan 144 and a second fan 146. The guiding flow channel 140 includes a first flow channel 1400 and a second flow channel 1402. The first flow channel 1400 has a first opening 1404, the second flow channel 1402 has a second opening 1406, and the first opening 1404 and the first opening The two openings 1406 are respectively located at two ends of the guiding flow channel 140.

As shown in FIG. 5, the spacer 142 is disposed between the first flow path 1400 and the second flow path 1402. The spacer 142 can be operated to selectively isolate or conduct the first flow channel 1400 from the second flow channel 1402. FIG. 5 illustrates a state in which the spacer 142 isolates the first flow path 1400 from the second flow path 1402. The first fan 144 is disposed at the first opening 1404 and the second fan 146 is disposed at the second opening 1406. In addition, the airflow guiding device 14 is disposed adjacent to the screen 16, and the screen 16 is the airflow disposed in FIG. On the entrance 100.

The first flow channel 1400 further has a third opening 1408 that is relatively adjacent to the spacer 142 with respect to the first opening 1404. The second flow channel 1402 further has two fourth openings 1410. The fourth opening 1410 is relatively adjacent to the spacer 142 relatively away from the second opening 1406. Since the optical module of the general projector includes three liquid crystal panels of R, G, and B, the third opening 1408 and the two fourth openings 1410 are respectively disposed opposite to the three liquid crystal panels of R, G, and B. When the projector 1 is in operation, the spacer 142 is operated to isolate the first flow path 1400 from the second flow path 1402, as shown in FIG. At this time, the first fan 144 and the second fan 146 are simultaneously operated, and the first fan 144 guides a first airflow A1 to flow into and out of the first flow channel 1400 through the first opening 1404 and the third opening 1408, respectively, and the second fan 146 A second airflow A2 is introduced into and out of the second flow channel 1402 through the second opening 1406 and the fourth opening 1410, respectively. Thereby, the first airflow A1 and the second airflow A2 can respectively cool the three liquid crystal panels of R, G, and B.

In addition, as the usage time of the projector 1 increases, dust entrained in the first airflow A1 and the second airflow A2 gradually deposits on the screen 16, so that the first airflow A1 and the second airflow 146 introduce the first airflow A1. The second airflow A2 is smaller, thereby reducing the heat dissipation efficiency of the first fan 144 and the second fan 146. Therefore, after using the projector 1 for a while, it is necessary to remove the dust deposited on the screen to avoid insufficient heat dissipation and affect the life of the optical components such as the liquid crystal panel and the polarizer.

Please refer to FIG. 6 and FIG. 7 , and FIG. 6 is a diagram of the spacer 142 being operated in FIG. 5 . A schematic diagram of the first flow channel 1400 and the second flow channel 1402 being turned on, and the first fan 144 is operated and the second fan 146 is stationary; FIG. 7 is the spacer 142 of FIG. 5 being operated to make the first flow path 1400 and The second flow path 1402 is turned on, and the second fan 146 is operated and the first fan 144 is stationary. When the projector 1 is idle and the dust on the screen 16 is to be removed, the user needs to operate the spacer 142 to make the first flow path 1400 and the second flow path 1402 conductive.

As shown in FIG. 6, after the first flow path 1400 and the second flow path 1402 are turned on, the first fan 144 can be operated first and the second fan 146 can be stopped. At this time, the first fan 144 guides an air flow A3 by the first An opening 1404 flows into the guiding flow path 140 and flows out of the guiding flow path 140 through the third opening 1408, the fourth opening 1410 and the second opening 1406. In this embodiment, since the first opening 1404 and the second opening 1406 are larger than the third opening 1408 and the fourth opening 1410, most of the airflow A3 flows out of the guiding flow channel 140 substantially through the second opening 1406. Thereafter, the air flow A3 is discharged through the stationary second fan 146 while blowing off the dust of one end portion 160 of the filter screen 16.

Similarly, as shown in FIG. 7, after the end portion 160 of the filter screen 16 is cleaned, the first fan 144 is allowed to stand still and the second fan 146 is operated. At this time, the second fan 146 guides a flow A4 by the first The two openings 1406 flow into the guiding flow path 140 and flow out of the guiding flow path 140 through the fourth opening 1410, the third opening 1408 and the first opening 1404. In this embodiment, since the first opening 1404 and the second opening 1406 are larger than the third opening 1408 and the fourth opening 1410, most of the airflow A4 flows out of the guiding flow path 140 substantially through the first opening 1404. Thereafter, the air flow A4 is discharged through the stationary first fan 144. At the same time, the dust at the other end 162 of the screen 16 is blown off.

Please refer to FIG. 8 to FIG. 10, FIG. 8 is a side view of the airflow guiding device 24 according to another embodiment of the present invention, and FIG. 9 is a top view of the airflow guiding device 24 in FIG. The figure is a schematic view showing the opening of the isolation cover 240 in Fig. 9. The main difference between the airflow guiding device 24 and the aforementioned airflow guiding device 14 is that the airflow guiding device 24 further includes an isolating cover 240 disposed opposite to the third opening 1408 and the fourth opening 1410. The isolation cover 240 is operable to selectively cover the third opening 1408 and the fourth opening 1410. In this embodiment, the isolation cover 240 is pivotally coupled to the guide flow path 140 such that the isolation cover 240 is rotatable relative to the guide flow path 140. The isolation cover 240 can include an operation portion 2400 exposed to the guide flow path 140. The operating portion 2400 is operable to actuate the isolation cover 240 to rotate relative to the guide flow passage 140.

When the projector 1 is in operation, the isolation cover 240 is opened as shown in Figs. 10 and 4. At this time, the airflow introduced by the first fan 144 and the second fan 146 may pass through the third opening 1408 and the fourth opening 1410, respectively. On the other hand, when the projector 1 is idle and the dust on the filter screen 16 is to be removed, the isolation cover 240 may be further operated to cover the third opening 1408 in addition to the operation of the spacer 142 to electrically connect the first flow channel 1400 and the second flow channel 1402. And the fourth opening 1410, as shown in FIG. 9, so that the airflow introduced by the first fan 144 or the second fan 146 does not leak from the third opening 1408 and the fourth opening 1410, thereby enhancing the dust on the filter screen 16. airflow.

Please refer to FIG. 11 and FIG. 12, and FIG. 11 is another embodiment of the present invention. A schematic view of the guide flow path 340, and FIG. 12 is a schematic view of the spacer 142 and the isolation cover 240 rotated in FIG. As shown in FIG. 11, the spacer 142 is pivotally coupled to the guide flow path 340 such that the spacer 142 is rotatable relative to the guide flow path 340. In addition, the spacer 142 may include an operating portion 1420 exposed to the guiding flow path 340. The operating portion 1420 can be operated to actuate the spacer 142 to rotate relative to the guiding flow passage 340. In this embodiment, the isolation cover 240 can be coupled to the spacer 142 and pivotally coupled to the guide flow path 340. Therefore, when the user rotates the operating portion 1420 to rotate the spacer 142 to turn on the first flow channel 1400 and the second flow channel 1402, the isolation cover 240 also rotates at the same time, thereby covering the third opening 1408 and the fourth opening 1410. As shown in Figure 12.

Referring to FIG. 13 and FIG. 14, FIG. 13 is a schematic view of a guide flow path 440 according to another embodiment of the present invention, and FIG. 14 is a schematic view showing the sliding of the spacer 142 in FIG. As shown in FIG. 13, the guiding flow path 440 further includes a groove 4400 between the first flow path 1400 and the second flow path 1402. In this embodiment, the spacer 142 is slidably disposed on the groove 4400. In addition, the spacer 142 includes an operating portion 1420 exposed to the guiding flow path 440. The operating portion 1420 can be operated to actuate the spacer 142 to slide relative to the guide runner 440 to selectively isolate or conduct the first runner 1400 and the second runner 1402.

Referring to FIG. 15 and FIG. 16, FIG. 15 is a schematic view of the guide flow path 540 according to another embodiment of the present invention, and FIG. 16 is a schematic view showing the spacer 142 rotated in FIG. As shown in FIG. 15, the spacer 142 and the guiding flow path 540 are pivotally connected to the pivot point 5400, so that the spacer 142 is rotatable relative to the guiding flow path 540. In addition, isolation The piece 142 can include an operating portion 1420 that is exposed to the guiding flow path 340. The operating portion 1420 can be operated to actuate the spacer 142 to rotate relative to the guide runner 540, as shown in FIG.

In addition, the present invention can also be connected to a motor (not shown) at the pivot point 5400 shown in FIG. The motor is disposed outside the guiding flow path 540, and the shaft center of the motor is connected to the spacer 142 by the pivot point 5400. When the motor is running, the shaft of the motor drives the spacer 142 to rotate relative to the guiding flow path 540 to selectively isolate or conduct the first flow path 1400 from the second flow path 1402.

It should be noted that the components of the same reference numerals in the above various figures have substantially the same structure and function, and therefore will not be described again in the related paragraphs.

Compared with the prior art, the present invention provides a movable spacer in the guiding flow path of the airflow guiding device. When the projector is idle, the spacer can be operated to make the two ends of the guiding flow channel be turned on, and then the fan is used. The introduced airflow removes dust from the filter screen. Thereby, the user can remove the dust on the filter screen without removing the filter.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1‧‧‧Projector

10‧‧‧shell

12‧‧‧ lens

14, 24‧‧‧ airflow guiding device

16‧‧‧Filter

100‧‧‧Air inlets and exits

140, 340, 440, 540‧‧‧ guided runners

142‧‧‧Isolated parts

144‧‧‧First fan

146‧‧‧second fan

160, 162‧‧‧ end

240‧‧‧Isolation cover

1400‧‧‧First runner

1402‧‧‧Second runner

1404‧‧‧first opening

1406‧‧‧ second opening

1408‧‧‧ third opening

1410‧‧‧fourth opening

1420, 2400‧‧‧ Operations Department

4400‧‧‧ trench

5400‧‧‧ pivot point

A3, A4‧‧‧ airflow

A1‧‧‧First airflow

A2‧‧‧second airflow

Fig. 1 is an external view of a projector according to an embodiment of the present invention.

Figure 2 is a bottom view of the projector in Figure 1.

Figure 3 is an internal view of the projector in Figure 1.

Fig. 4 is a top view of the air flow guiding device in Fig. 3.

Figure 5 is a front elevational view of the airflow guiding device of Figure 4.

Fig. 6 is a view showing the spacer in Fig. 5 being operated to make the first flow path and the second flow path conductive, and the first fan is operated and the second fan is stationary.

Fig. 7 is a view showing the spacer in Fig. 5 being operated to make the first flow path and the second flow path conductive, and the second fan to operate while the first fan is stationary.

Figure 8 is a side elevational view of a gas flow guiding device in accordance with another embodiment of the present invention.

Figure 9 is a top view of the airflow guiding device of Figure 8.

Figure 10 is a schematic view showing the opening of the isolation cover in Figure 9.

Figure 11 is a schematic view of a guide flow path according to another embodiment of the present invention.

Figure 12 is a schematic view of the spacer and the isolation cover after rotation in Fig. 11.

Figure 13 is a schematic view of a guide flow path according to another embodiment of the present invention.

Fig. 14 is a schematic view showing the sliding of the spacer in Fig. 13.

Figure 15 is a schematic view of a guide flow path according to another embodiment of the present invention.

Figure 16 is a schematic view of the spacer after rotation in Figure 15.

14‧‧‧Airflow guiding device

16‧‧‧Filter

140‧‧‧ Guided runner

142‧‧‧Isolated parts

144‧‧‧First fan

146‧‧‧second fan

1400‧‧‧First runner

1402‧‧‧Second runner

1404‧‧‧first opening

1406‧‧‧ second opening

1408‧‧‧ third opening

1410‧‧‧fourth opening

A1‧‧‧First airflow

A2‧‧‧second airflow

Claims (30)

An airflow guiding device comprises: a guiding flow channel comprising a first flow channel and a second flow channel, the first flow prop has a first opening and a third opening, and the second flow prop has a second opening a fourth opening, the first opening and the second opening are respectively located at two ends of the guiding flow channel; a spacer disposed between the first flow channel and the second flow channel, the spacer can be operated Optionally, the first flow channel is isolated or electrically connected to the second flow channel; a first fan is disposed at the first opening; and a second fan is disposed at the second opening; wherein the third opening is opposite The first opening is relatively adjacent to the spacer away from the first opening, and the fourth opening is relatively adjacent to the spacer. The first opening and the second opening are larger than the third opening and the fourth opening. The airflow guiding device of claim 1, wherein the spacer is pivotally connected to the guiding flow path, and the spacer is rotatable relative to the guiding flow path to selectively enable the first flow path and the first The second flow path is isolated or turned on. The airflow guiding device of claim 1, wherein the guiding flow channel further comprises a groove between the first flow channel and the second flow channel, and the spacer is slidably disposed on the groove To selectively isolate the first flow channel from the second flow channel or Turn on. The airflow guiding device of claim 2 or 3, wherein the spacer comprises an operating portion exposed to the guiding flow passage, the operating portion being operable to actuate the spacer relative to the guiding flow passage And selectively isolating or conducting the first flow path and the second flow path. The airflow guiding device according to claim 1, further comprising a motor having an axis, the motor being disposed outside the guiding flow channel, the axis being connected to the spacer, and the shaft is when the motor is running The spacer is driven to rotate relative to the guiding flow path to selectively isolate or conduct the first flow path from the second flow path. The airflow guiding device of claim 1, wherein when the spacer is operated to make the first flow channel and the second flow path conductive, and the first fan is in operation and the second fan is stationary, the first The fan guides an air flow into the guiding flow path through the first opening, and flows out of the guiding flow path through the second opening. The airflow guiding device of claim 1, wherein the first fan is operated when the spacer is operated to isolate the first flow path from the second flow path, and the first fan and the second fan are operated Directing a first airflow into and out of the first flow path through the first opening and the third opening, respectively, and the second airflow guiding a second airflow to flow in and out through the second opening and the fourth opening respectively The second flow path. The airflow guiding device of claim 1, wherein when the spacer is operated to make the first flow channel and the second flow path conductive, and the first fan is in operation and the second fan is stationary, the first The fan guides an air flow into the guiding flow path through the first opening, and flows out of the guiding flow path through the third opening, the fourth opening and the second opening. The airflow guiding device of claim 1, wherein when the spacer is operated to make the first flow channel and the second flow path conductive, and the first fan is in operation and the second fan is stationary, the first The fan guides an air flow into the guiding flow path through the first opening, and substantially flows out of the guiding flow path through the second opening. The airflow guiding device of claim 1, wherein the spacer further comprises an isolation cover disposed opposite the third opening and the fourth opening, when the spacer is operated to make the first flow path The isolation cover covers the third opening and the fourth opening when the second flow path is electrically connected. The airflow guiding device of claim 10, wherein the first flow channel is electrically connected to the second flow channel, the isolation cover covers the third opening and the fourth opening, and the first fan is operated and the second When the fan is stationary, the first fan guides an airflow into the guiding flow path through the first opening, and flows out of the guiding flow path through the second opening. The airflow guiding device of claim 1, further comprising an isolation cover, the isolation cover being disposed opposite to the third opening and the fourth opening, the isolation cover being operable The third opening and the fourth opening are selectively covered. The airflow guiding device of claim 12, wherein the isolation cover is pivotally connected to the guiding flow channel, and the isolation cover is rotatable relative to the guiding flow channel to selectively cover the third opening and the first Four openings. The airflow guiding device of claim 13, wherein the isolation cover comprises an operating portion exposed to the guiding flow path, the operating portion being operable to actuate the isolation cover to rotate relative to the guiding flow path, The third opening and the fourth opening are selectively covered. The airflow guiding device of claim 12, wherein the spacer is operated to cover the third opening and the fourth opening when the spacer is operated to electrically connect the first flow path with the second flow path, When the first fan is running and the second fan is stationary, the first fan guides an airflow into the guiding flow channel through the first opening, and flows out of the guiding flow channel through the second opening. A projector comprising: a casing having an airflow inlet and outlet; a screen disposed on the airflow inlet and outlet; and an airflow guiding device disposed in the casing, the airflow guiding device comprising: a guiding The flow path includes a first flow path and a second flow path, the first flow prop has a first opening and a third opening, and the second flow prop has a first a second opening and a fourth opening, the first opening and the second opening are respectively located at two ends of the guiding flow channel; a spacer disposed between the first flow channel and the second flow channel, the spacer Controlling to selectively isolate or conduct the first flow path from the second flow path; a first fan disposed in the first opening; and a second fan disposed in the second opening; wherein the first The third opening is relatively adjacent to the spacer relative to the first opening, and the fourth opening is relatively adjacent to the spacer relative to the second opening, the first opening and the second opening are larger than the third opening, the fourth Opening. The projector of claim 16, wherein the spacer is pivotally coupled to the guiding flow path, the spacer being rotatable relative to the guiding flow path to selectively cause the first flow path and the second flow The channel is isolated or turned on. The projector of claim 16, wherein the guiding flow path further comprises a groove between the first flow path and the second flow path, and the spacer is slidably disposed on the groove to The first flow channel is selectively isolated or electrically connected to the second flow channel. The projector of claim 17 or 18, wherein the spacer comprises an operating portion exposed to the guiding flow path, the operating portion being operable to actuate the spacer to move relative to the guiding flow path, The first flow channel and the second flow channel are selectively isolated or turned on. The projector of claim 16, further comprising a motor having an axis disposed outside the guiding flow path in the housing, the axis being coupled to the spacer, when the motor is running, The shaft drives the spacer to rotate relative to the guiding flow path to selectively isolate or conduct the first flow path from the second flow path. The projector of claim 16, wherein the first fan guides when the spacer is operated to cause the first flow path to be electrically connected to the second flow path, and the first fan is in operation and the second fan is stationary An air flow flows into the guiding flow path through the first opening, and flows out of the guiding flow path through the second opening. The projector of claim 16, wherein when the spacer is operated to isolate the first flow path from the second flow path, and the first fan and the second fan are operated, the first fan guides The first airflow flows into and out of the first flow channel through the first opening and the third opening, respectively, and the second airflow guides a second airflow to flow in and out through the second opening and the fourth opening respectively. Second runner. The projector of claim 16, wherein the first fan guides when the spacer is operated to cause the first flow path to be electrically connected to the second flow path, and the first fan is in operation and the second fan is stationary An air flow flows into the guiding flow path through the first opening, and the guiding flow path is flowed out through the third opening, the fourth opening and the second opening. The projector of claim 16, wherein the spacer is operated to cause the first When the flow path is electrically connected to the second flow path, and the first fan is running and the second fan is stationary, the first fan guides an air flow into the guide flow path through the first opening, and substantially The second opening flows out of the guiding flow path. The projector of claim 16, wherein the spacer further comprises an isolation cover, the isolation cover being disposed opposite the third opening and the fourth opening, wherein the spacer is operated to cause the first flow path and the The isolation cover covers the third opening and the fourth opening when the second flow path is turned on. The projector of claim 25, wherein when the first flow path is electrically connected to the second flow path, the isolation cover covers the third opening and the fourth opening, and the first fan is in operation and the second fan is stationary The first fan guides an airflow into the guiding flow path through the first opening, and flows out of the guiding flow path through the second opening. The projector of claim 16, wherein the airflow guiding device further comprises an isolation cover disposed opposite the third opening and the fourth opening, the isolation cover being operable to selectively cover the a third opening and the fourth opening. The projector of claim 27, wherein the isolation cover is pivotally connected to the guiding flow path, and the isolation cover is rotatable relative to the guiding flow path to selectively cover the third opening and the fourth opening . The projector of claim 28, wherein the isolation cover comprises an operating portion, exposed In the guiding flow path, the operating portion is operable to actuate the isolation cover to rotate relative to the guiding flow path to selectively cover the third opening and the fourth opening. The projector of claim 27, wherein when the spacer is operated to conduct the first flow path and the second flow path, the isolation cover is operated to cover the third opening and the fourth opening, and the When the first fan is running and the second fan is stationary, the first fan guides an airflow into the guiding flow path through the first opening, and flows out of the guiding flow path through the second opening.