JP2017159266A - Filter device, and equipment provided with the filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device which can supply air with a dust amount sufficiently reduced without requiring frequent maintenance.SOLUTION: A filter device sucks air containing dust, and separates into air with reduced dust and air containing more dust. The filter device includes: a fan which is long in an axial direction, takes in the air containing the dust in an axial direction and sends out in a centrifugal direction by centrifugal force; and a casing for housing the fan. The casing includes a suction port in which the air containing the dust is sucked, a discharge port from which the air with the reduced dust is discharged, and an exhaust port from which the air containing more dust is exhausted. The suction port is arranged on one end part side in the axial direction of the fan. The discharge port is arranged on the other end part side opposite to the one end part. The exhaust port is arranged between the suction port and the discharge port in the axial direction of the fan.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter device and a device including the filter device.

  2. Description of the Related Art Conventionally, in an apparatus such as an image projection apparatus, it is known to reduce dust entering the apparatus by providing an air filter that captures dust at an intake port.

  In addition, a bypass blower with a bifurcated duct is provided inside the device, the air containing more dust is separated, and the air in which the amount of dust is reduced is supplied into the device. It is known to reduce the influence of elements on dust (for example, Patent Document 1).

  However, since the air filter that captures dust is clogged when used for a certain period of time and does not allow air to pass therethrough, frequent maintenance such as replacement and cleaning is required.

  Moreover, since the structure of patent document 1 isolate | separates dust inside after taking in ambient air containing dust in an apparatus, dust will spread in an apparatus and it will have a bad influence on the performance of the component in an apparatus. May affect. Furthermore, the dust separation by the bypass blower of Patent Document 1 is not sufficient.

  In view of the above, it is an object of one embodiment of the present invention to provide a filter device that can supply air in which dust is sufficiently reduced without requiring frequent maintenance.

  In order to solve the above problems, one embodiment of the present invention is a filter device that sucks in air containing dust and separates the air into dust-reduced air and air that contains more dust. An axially long fan, and a centrifugal fan that sends out the centrifugal air in the centrifugal direction. A suction port, a discharge port through which air with reduced dust is discharged, and a discharge port through which air containing more dust is discharged, wherein the suction port is in the axial direction of the fan. The discharge port is disposed on the other end side opposite to the one end, and the discharge port is in the axial direction of the fan. Arranged between the suction port and the discharge port Characterized in that it is.

  According to one embodiment of the present invention, it is possible to provide a filter device that can supply air in which dust is sufficiently reduced without requiring frequent maintenance.

It is a figure which shows the filter apparatus by 1 aspect of this invention. It is a figure which shows the filter apparatus by 1 aspect of this invention. It is a figure which shows the filter apparatus by 1 aspect of this invention. It is a perspective view which shows the fan in 1 aspect of this invention. It is a perspective view which shows the fan in 1 aspect of this invention. FIG. 11 illustrates an example of an electronic device according to one embodiment of the present invention. It is a figure which shows mounting | wearing with the apparatus of the filter apparatus by 1 aspect of this invention. It is a figure which shows mounting | wearing with the apparatus of the filter apparatus by 1 aspect of this invention. It is a figure which shows mounting | wearing with the apparatus of the filter apparatus by 1 aspect of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view along the longitudinal direction of a filter device according to an aspect of the present invention. The configuration and function of the filter device will be schematically described with reference to FIG.

  The filter device 100 sucks air containing dust and separates it into air with reduced dust and air with more dust. The filter device 100 includes an axially long fan 20 and a casing 30 that houses the fan 20, which takes in air containing dust in the axial direction and sends it out in the centrifugal direction by centrifugal force. The casing 30 includes a suction port 50 through which air containing dust is sucked in, a discharge port 61 through which air with reduced dust is discharged, and a discharge port 62 through which air containing more dust is discharged. Yes. The suction port 50 is provided on one end side in the axial direction of the fan 20, and the discharge port 61 is disposed on the other end side opposite to the one end portion. The outlet 62 is disposed between the suction port 50 and the discharge port 61 in the axial direction of the fan 20.

  In the filter device 100, the rotation around the axis of the fan 20 creates a flow of taking in (intakes) air in the axial direction of the fan 20 and sending out (exhaust) air in the centrifugal direction by centrifugal force.

  In general, the air contains dust 1 of various sizes, but the untreated air containing the dust 1 (air containing dust) is passed through the suction port 50 by the fan 20. The air is taken into the fan 20 by riding on the flow (axial flow). Since a relatively large centrifugal force acts on the relatively heavy dust 2 among the dust contained in the taken-in air, it is difficult for the relatively heavy dust 2 to keep floating in the air. For this reason, it is on a position relatively close to the end of the casing 30 where the suction port 50 is provided, riding on the air flow (centrifugal flow) radially outward from the shaft that is the center of rotation of the fan 20. Then, it is discharged to the outside of the fan 20.

  Centrifugal force acting on the dust 3 that is lighter than the relatively heavy dust 2 but has a medium weight is smaller than that of the relatively heavy dust 2. Therefore, the dust 3 having a medium weight can float in the air for a longer period of time, and inside the fan 20, further down along the direction in which the fan 20 takes in air (the discharge port 61 is provided). Proceed to a position closer to the edge). However, before reaching the position where the discharge port 61 is provided, like the relatively heavy dust 2, it is discharged to the outside of the fan 20 by the action of centrifugal force. As a result, air including relatively light dust 4 and minute dust 5 (air in which dust is reduced) can be discharged from the discharge port 61 as compared to the dust 3 having a medium weight.

  The classification of dust such as the relatively heavy dust 2, the moderately heavy dust 3, the relatively light dust 4, and the minute dust 5 is for facilitating explanation of the function of the filter device. The size and weight of dust removed or discharged by the filter device 100 according to one embodiment of the present invention are not limited.

  In the filter device 100, the suction port 50 through which air containing dust is sucked and the discharge port 61 through which air with reduced dust is discharged are in the axial direction of the long fan 20 (the direction in which the rotating shaft extends). Are provided at opposite ends of each other. That is, the suction port 50 and the discharge port 61 are arranged at an interval in the axial direction of the fan 20 (longitudinal direction of the filter device 100).

  Since the suction port 50 and the discharge port 61 are arranged as described above, even if there is dust or dust that has not been discharged to the outside near the suction port 50 because the action of centrifugal force is relatively small, the fan 20 Further centrifugal force may be applied while the axial direction of the gas advances from the upstream side to the downstream side (to the end side where the discharge port 61 is provided). That is, in the filter device 100, the air containing dust sucked from the suction port 50 can be processed before reaching the discharge port 61. Therefore, dust in the air can be efficiently removed or reduced as compared with the configuration of the bypass blower disclosed in Patent Document 1.

  The filter device 100 includes a discharge port 62 that discharges air containing more dust. The discharge port 62 is connected to the suction port 50 in the axial direction of the fan 20 (longitudinal direction of the filter device 100). It is arranged between the outlet 61. That is, the discharge port 61 and the discharge port 62 are also shifted from each other in the axial direction of the fan 20 (longitudinal direction of the filter device 100). Thereby, after the air containing dust is separated, the discharge air in which the dust is reduced and the air containing more dust can be reliably separated and discharged.

  In this manner, the filter device 100 can separate the air in which the dust is sufficiently reduced from the ambient air containing the dust and supply the air from the discharge port 61. Here, the filter device 100 not only sufficiently reduces the weight of the dust contained in the air, but can also reduce the size (particle size) of the dust contained in the supplied air.

  Further, the filter device 100 according to one embodiment of the present invention does not require maintenance such as periodic replacement and cleaning, unlike an air filter such as a nonwoven fabric or a net that captures and accumulates dust.

  In the filter device 100 according to one aspect of the present invention, the rotation of the fan (blower) 20 is used to separate and discharge the air with reduced dust from the air containing dust. As described above, the fan (blower) 20 can suck in air including dust taken in from the suction port 50 from the axial direction and discharge the air in the centrifugal direction by centrifugal force. Thus, the rotation of the fan 20 can create an axial air flow and a radial air flow in the filter device 100.

  The form of the fan (blower) 20 is not limited as long as it takes air from the axial direction and sends it out in the centrifugal direction by centrifugal force. The fan 20 may take in air from the axial direction and send it out in a direction perpendicular to the axial direction. Further, it may be one that takes in air from the axial direction and sends it out in a direction between the direction perpendicular to the axial direction and the axial direction (that discharges air obliquely with respect to the axial direction).

  Examples of the fan 20 include so-called centrifugal fans (width fans) such as sirocco fans (multi-blade fans) and turbo fans (backward fans), and mixed flow fans. Among them, it is preferable to use a sirocco fan because a high static pressure can be generated. Thereby, air with reduced dust can be separated and supplied with high efficiency.

  The fan 20 has a plurality of blades that cut the wind, and a motor unit 23 is connected to the shaft of the fan 20. When the fan 20 is rotated by the power from the motor unit 23, an air flow is created from the center (axis) of rotation toward the outside in the radial direction. The motor unit 23 is provided on the downstream side in the direction in which the fan 20 takes in air, and may be attached to one end of the casing 30 described later. The fan 20 is rotatably arranged in a casing 30 described later.

  Further, the fan 20 used in the filter device 100 is long in the axial direction, that is, the axial length of the fan 20 is larger than the outer diameter of the fan 20. Thereby, sufficient centrifugal force can be made to act on the dust which moves inside the fan 20 in the axial direction of the fan (longitudinal direction of the filter device 100). As will be described later, when a plurality of fans are connected in series and used, the length of the fan 20 in the axial direction indicates the total length after being connected.

  If the fan 20 is long in the axial direction, the ratio between the axial length of the fan 20 and the outer diameter can be appropriately set according to the installation location and installation conditions.

  The filter device 100 of one embodiment of the present invention includes a long casing 30 that surrounds the long fan 20 and accommodates the fan 20. The longitudinal direction of the casing 30 can be configured to be the same as the axial direction of the fan 20.

  The casing 30 can be configured coaxially with the fan 20. The inner contour shape of the casing 30 can be a cylindrical shape, but can be any shape as long as the function of the fan 20 to be accommodated is exhibited. The outer contour shape of the casing 30 may be any shape as long as it does not hinder the rotation of the fan 20 to be accommodated. The outer contour shape may be a cylindrical shape or a shape other than that, for example, a prismatic shape.

  The casing 30 is provided with a suction port 50 through which outside air containing dust is sucked, a discharge port 61 through which air with reduced dust is discharged, and a discharge port 62 through which air containing more dust is discharged. Yes. The suction port 50 and the discharge port 61 are disposed at opposite ends of the casing 30 in the longitudinal direction.

  The suction port 50 may be formed on, for example, an end surface of one end portion of the casing 30 in the longitudinal direction. The suction port 50 may have an arbitrary shape, but may have a circular shape coaxial with the fan 20. In this case, the diameter of the suction port 50 can be set to an arbitrary size that does not hinder the intake of the fan 20, but it may be substantially the same as the intake diameter of the fan 20.

  The discharge port 61 may be provided on the side surface of the end opposite to the end where the suction port 50 is provided in the longitudinal direction of the casing 30.

  When the filter device 100 is attached to a device such as an image projection device, the size and shape of the discharge port 61 can be configured to correspond to the size and shape of the air intake port of the device.

  Further, the discharge port 62 may be disposed on the side surface of the casing 30 between the suction port 50 and the discharge port 61. That is, the discharge port 62 can be positioned upstream of the discharge port 61 in the flow direction of the air flowing inside the fan 20.

  The discharge port 62 can be provided on the side surface of the casing facing the discharge port 61 with the axis of the fan 20 interposed therebetween. In addition, if separation from the air with reduced dust discharged from the discharge port 61 is performed reliably, a plurality of discharge ports 62 are formed over the peripheral surface of the casing 30, and air containing more dust is supplied to the fan. You may be comprised so that it may discharge radially outward of 20 radial directions.

  The filter device 100 according to one aspect of the present invention may include a partition member 40 in a space formed between the fan 20 and the casing 30. The partition member 40 can be disposed so as to intersect the axial direction of the fan 20.

  2 and 3 show examples of the mode of the filter device 100 including the partition member 40. FIG.

  The partition member 40 may be disposed so as to partition a space surrounding the outer contour of the fan 20 formed between the fan 20 and the casing 30 in the axial direction of the fan 20. For example, a space formed between the fan 20 and the casing 30 may be provided so as to be partitioned in a direction orthogonal to the axial direction of the fan 20.

  In the space formed between the fan 20 and the casing 30 of the filter device 100, the air flows along the casing 30 from the end where the suction port 50 is provided toward the end where the discharge port 61 is provided. (For example, a flow indicated by arrows 9 and 10 in FIG. 2 is generated). Therefore, some of the dust discharged to the outside of the fan 20 is not discharged out of the filter device 100 from the discharge port 62 but is carried to the position of the discharge port 61.

  However, the partition member 40 is provided to prevent the air flow in the axial direction of the fan 20 in the space formed between the fan 20 and the casing 30 (for example, indicated by arrows 9 and 10 in FIG. 2). ), The dust discharged to the outside of the fan 20 can be prevented from reaching the discharge port 61. The dust whose movement toward the discharge port 61 is prevented by the partition member 40 is discharged from the discharge port 62.

  With this configuration, for example, relatively light dust 4 as shown in FIG. 2 and FIG. 3 can be discharged from the discharge port 62 on the centrifugal air flow created by the fan 20. Slightly containing air (air with reduced dust) can be obtained. Such minute dust 5 is small dust that cannot be removed even with a general filter.

  Thus, by providing the partition member 40 in the filter device 100, it is possible to obtain the filter device 100 that exhibits the effect of reducing dust in the air more remarkably.

  The partition member 40 may be provided at one place in the longitudinal direction of the filter device 100, or may be provided at a plurality of places. In the case where the partition member 40 is provided at a plurality of locations, the action of preventing dust flow from upstream to downstream in the space formed between the fan 20 and the casing 30 becomes higher, so that Furthermore, sufficiently reduced air can be supplied from the discharge port 61. 2 and 3 show a configuration in which the partition members 40 are arranged at two locations in the longitudinal direction of the filter device 100. FIG.

  The partition member 40 may be an annular member that extends continuously in the circumferential direction of the fan 20 so as to divide a space formed between the fan 20 and the casing 30 in the axial direction. Further, it may be a plate-like member extending in the circumferential direction of the fan 20. The partition member 40 may be formed with a notch or a hole in the circumferential direction of the fan 20.

  The partition member 40 may be provided closer to the suction port 50 than the position where the discharge port 61 is open in the axial direction of the fan 20. For example, in the axial direction of the fan 20, it is provided at a position that does not overlap with the area where the discharge port 61 is open. The partition member may be located between the discharge port 62 and the discharge port 61.

  When a plurality of partition members 40 are provided, the partition member 40 closest to the discharge port 61 is closer to the suction port 50 than the position where the discharge port 61 is opened, and the discharge port 61 is opened. It may be provided at a position that does not overlap with the existing area. Further, the partition member 40 closest to the discharge port 61 side may be disposed between the discharge port 62 and the discharge port 61.

  The partition member 40 may be supported by the fan 20 or may be supported by the casing 30.

  When the partition member 40 is supported by the fan 20, the partition member 40 may be a member that protrudes radially outward (toward the casing 30) from the outer contour of the fan 20. In that case, the partition member 40 can be a member that is bonded or fixed to at least a part of the radially outer end of the blade of the fan 20. The partition member 40 may be integrated with the blades of the fan 20.

  On the other hand, when the partition member 40 is supported by the casing 30, it can be a member that protrudes from the inner surface of the casing 30 toward the fan 20. In that case, the partition member 40 may be an annular member that extends in the circumferential direction of the fan 20 along the inner surface of the casing 30. In that case, part or all of the outer peripheral edge of the partition member 40 may be fixed (adhered) to the inner surface of the casing 30. The partition member 40 may be formed integrally with the casing 30.

  When the partition member 40 is supported by the casing 30, the partition member 40 may extend from the inner surface of the casing 30 to a position slightly away from the radially outer end of the blades of the fan 20. Moreover, you may contact the edge part of the radial direction outer side of the blade | wing of the fan 20. FIG.

  The partition member 40 may protrude into the fan 20 so that a part of the space inside the fan 20 intersects the axial direction of the fan 20. In FIG. 3, the example of the aspect which the partition member 40 protrudes also into the inside of the fan 20 is shown.

  By providing the partition member 40 inside the fan 20, it becomes possible to prevent the flow from the upstream to the downstream in the axial direction of the fan 20 (the longitudinal direction of the filter device 100) even inside the fan 20. The air flow inside the fan 20 can be changed. For example, the flow near the inner peripheral surface of the fan 20 is blocked, and air that originally flows along the inner peripheral surface of the fan 20 in the axial direction from upstream to downstream can flow radially outward ( For example, an air flow indicated by arrows 7 and 8 in FIG. 3 is generated).

  As described above, the partition member 40 is also protruded into the fan 20 so that the dust inside the fan 20 is disposed at the end portion (the motor portion 23 is provided) on the side where the discharge port 61 is provided. It is possible to reduce intrusion on the side of the edge. This further enhances the effect of enabling the supply of air with sufficiently reduced dust.

  In the aspect of FIG. 3, the partition member 40 protrudes inside the fan 20 at the same position as the position protruding from the outer contour of the fan 20 in the axial direction of the fan 20. In this case, the portion protruding to the outside of the fan 20 and the portion protruding to the inside of the fan 20 can be configured as separate members, or the portion protruding to the outside of the fan 20 and the portion protruding to the inside of the fan 20. It is also possible to form an integral partition member 40 including

  3, the partition member 40 may protrude into the fan 20 at a position different from the position protruding from the outer contour of the fan 20. Furthermore, the partition member 40 may be a combination of the partition member supported by the casing 30 as described above and the partition member protruding into the fan 20.

  As a material of the partition member 40, the same material as the fan 20 can be used, and the same material as the casing 30 can be used. The material of the partition member 40 may be an elastic body such as rubber or resin. Thereby, smooth rotation of the fan 20 is enabled, and even when the partition member 40 and the casing 30 are in contact or when the partition member 40 and the fan 20 are in contact with each other, damage to the member is prevented or reduced. be able to.

  In one embodiment of the present invention, the filter device 100 may include a plurality of fans 20. Further, a plurality of fans can be connected in series for use. The number of fans connected and used can be 2-4.

  FIG. 4 and FIG. 5 show perspective views of modes when three fans 20 are used.

  When a plurality of fans 20 are used, the fans may be the same as each other or different from each other. When a plurality of different fans 20 are used, at least one of the size, material, intake diameter, rotation speed, air discharge direction, number of blades, size, shape, and arrangement angle of the entire fan is different from each other. A thing may be used.

  For example, the intake diameter of the fan arranged on the upstream side in the direction in which the fan sucks air may be larger than the intake diameter of the fan arranged on the downstream side. With this configuration, intake efficiency can be improved.

  In the case where a plurality of fans 20 are used, it is preferable that the air flow in the axial direction from one fan 20 to another adjacent fan 20 inside the fan. Specifically, the air flows from the fan provided upstream (the fan on the suction port 50 side in the axial direction) to the fan provided downstream (the fan on the discharge port 61 side in the axial direction), and the fan 20 It is possible to configure so that the inside of the communication is established.

  When a plurality of fans 20 are provided, the partition member 40 can be a plate-like member that is sandwiched and held between the fans. For example, as shown in FIGS. 4 and 5, the partition member 40 can have a donut-shaped flat plate shape having an opening or a hole in the center.

  When the partition member 40 is supported by the fan 20, the partition member 40 may extend radially outward from the fan 20 to a position slightly away from the inner surface of the casing 30. Further, it may be in contact with the inner surface of the casing 30.

  The filter device 100 according to one aspect of the present invention can be used as an air supply unit for an apparatus that needs to take in air during operation. The filter device 100 can be mounted on the outside of such a device, or can be used in a form incorporated in the device. When mounting outside the device, the filter device 100 may be firmly fixed to the device or may be detachably mounted.

  Examples of devices to which the filter device 100 is attached include electronic devices such as image projection devices (projectors) and personal computers (including those used in general households), and in particular, air is sucked from outside to be ventilated in the devices. The apparatus which cools the inside of an apparatus by this, for example, the thing provided with the cooling fan in the apparatus is mentioned.

  In such a device, dust or dust contained in the external air may adhere to or enter the element in the device and impair the function of the element. However, if dust is forcibly removed before air flows into the device, the dust will not enter the device. Therefore, by using the filter device 100 according to one embodiment of the present invention, air in which dust is sufficiently reduced can be supplied into the device.

  FIG. 6 shows an example of an electronic device to which the filter device 100 is attached. FIG. 6 is a top view of a cross section of the image projection apparatus 500 cut in the horizontal direction. In FIG. 6, while showing the structure of the image projection apparatus 500, the airflow which flows through the inside of the image projection apparatus 500 is shown by the arrow.

  According to FIG. 6, the ambient air taken in by the cooling fan 510 near the intake port 580 is routed by the centrifugal fan 520, while the DMD heat radiation plate 560, the lamp block 550, and the power supply circuit 570 are each changed. You can see that the element is cooling. Finally, the exhaust fans 530 and 540 exhaust the air out of the housing.

  In the device shown in FIG. 6, it is clear that any airflow is sucked from the air inlet 580. Therefore, when the filter device 100 according to an aspect of the present invention is mounted on the image projection device 500 illustrated in FIG. 6, the discharge port 61 of the filter device 100 corresponds to the intake port 580 of the image projection device 500. Install (FIG. 7).

  FIG. 8 shows an example of how the filter device 100 according to one embodiment of the present invention is attached to the image projection device 500. In FIG. 8, the discharge port 61 of the filter device 100 is aligned with the intake port 580 of the image projection device 500. In this case, air from the discharge port 61 (air in which dust is reduced) is sucked into the intake port 580 of the image projection apparatus 500, and ambient air (air containing dust) and air from the discharge port 62 (a lot of dust). (Including air) is not inhaled.

  The filter device 100 can be attached to an apparatus such as the image projection apparatus 500 by bonding, screwing, or the like, or can be fitted by changing the outer contour shape of one or both of the casing 30 and the apparatus. It can also be comprised so that it can mount | wear. In the example of FIG. 8, an annular member is formed on the side surface of the casing 30 of the filter device 100 that faces the image projection device 500, and this member is adapted to the shape of the side surface of the image projection device 500.

  Air containing dust is sucked from the suction port 50 of the filter device 100 and processed in the filter device 100, and then air from which dust has been removed or reduced is discharged from the discharge port 61. Then, the air from which the dust discharged from the discharge port 61 has been removed or reduced is sent to the intake port 580 of the image projection apparatus 500.

  Further, FIG. 9 shows an example of an image projection apparatus 500 equipped with the filter device 100.

  In FIG. 9, the side surface of the casing 30 is provided with a discharge port 62 that opens at an area that occupies half or more of the surface area of the side surface of the casing 30.

  The discharge port 62 may have a larger area than the discharge port 61. The discharge port 62 can be divided into a plurality of openings as shown in FIG. Thereby, the intensity | strength of the casing 30 can be ensured. The discharge port 61 can be similarly divided.

  In order to prevent access from the openings of the suction port 50, the discharge port 61, and the discharge port 62 to the elements accommodated in the casing 30, the openings of the suction port 50, the discharge port 61, and the discharge port 62 are Members such as lattices and nets can also be arranged.

  In FIG. 9, the filter device 100 is mounted on the image projection device 500 in a horizontal state, but the mounting format is not limited to this. The filter device 100 can be mounted so that the longitudinal direction of the filter device 100 is the vertical direction. Further, the filter device 100 can be mounted obliquely, for example, such that the end portion where the discharge port 61 is provided is higher than the end portion where the suction port 50 is provided.

DESCRIPTION OF SYMBOLS 1 Dust of various sizes 2 Relatively heavy dust 3 Medium weight dust 4 Relatively light dust 5 Minute dust 7, 8, 9, 10, 11 Air flow direction 20 Fan 23 Motor part 30 Casing 40 Partition member 50 Suction port 61 Discharge port 62 Discharge port 100 Filter device 500 Image projection device

JP 2014-48354 A

Claims (9)

A filter device that sucks in air containing dust and separates it into air with reduced dust and air with more dust,
A fan that is long in the axial direction, takes in air containing the dust in the axial direction, and sends it out in the centrifugal direction by centrifugal force;
A casing that houses the fan,
The casing has an intake port through which air containing the dust is sucked, a discharge port through which air with reduced dust is discharged, and an exhaust port through which air containing more dust is discharged. And
The suction port is provided on one end side in the axial direction of the fan, and the discharge port is disposed on the other end side opposite to the one end portion. The filter device, wherein an outlet is disposed between the suction port and the discharge port in the axial direction of the fan. A space formed between the fan and the casing is provided with a partition member disposed so as to cross the axial direction of the fan;
The filter device according to claim 1, wherein the partition member is located between the discharge port and the discharge port in the axial direction of the fan.   The filter device according to claim 2, wherein the partition member protrudes into the fan so that a part of the space inside the fan intersects the axial direction of the fan.   The filter device according to any one of claims 2 and 3, wherein the partition member has a flat plate shape with a hole provided in the center.   The filter device according to any one of claims 1 to 4, comprising a plurality of the fans, wherein the plurality of fans are connected in series.   The filter device according to claim 5, wherein an intake diameter of a fan arranged on the one end side is larger than an intake diameter of a fan arranged on the other end side.   The apparatus which attached the filter apparatus as described in any one of Claim 1 to 6 outside.   The device according to claim 7, wherein the device is cooled by sucking air discharged from the discharge port of the filter device and allowing the air to pass through the device.   The device according to claim 8 which is an image projection device.

Images