JP2007101146A - Duct fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct fan capable of being installed, in particular, in a narrow space above the ceiling of a high-rise condominium and the like, with respect to the duct fan installed in the space under the roof of a building and the like and used for air supply ventilation. <P>SOLUTION: This duct fan which can be thinned and miniaturized while securing necessary air volume, is provided by mounting a single suction type air blower 9 in a flow channel 8 of a machine body 3, mounting a motor 15 in the flow channel 8 at a fan suction opening 13 side, of the single suction-type air blower 9, mounting a filter partitioning wall 12 provided with an opening 11 for ventilation between a machine body suction opening 1 and the fan suction opening 13 of the single suction type air blower 9, disposing an air cleaning filter 10 for cleaning the air, on a face at the fan suction opening 13 side, of the filter partitioning wall 12, and inclining the air cleaning filter 10 downward toward the fan suction opening 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a duct fan that is arranged in a space such as the back of a ceiling of a building and is used for air supply and ventilation through a duct from the outside to the room, and is particularly installed in a narrow space behind the ceiling of a high-rise apartment or the like.

  Conventionally, as an example of a duct fan in a general living space, those shown in FIGS. 8 and 9 are known (see, for example, Patent Document 1).

  The configuration will be described below with reference to FIGS.

As shown in FIG. 8 and FIG. 9, there is a box-shaped airframe 106 that is installed by connecting a suction-side duct 103 to the airframe suction port 102 and a blower-side duct 105 to the airframe air outlet 104 in the deep ceiling 101. . The airframe 106 is provided with an airframe inlet 102 on the suction side, an airframe outlet 104 on the discharge side, and a single suction blower 108 having a fan casing 107 and an air cleaning filter 109 inside the airframe 106. A blowout air chamber 111 is provided between the fan discharge port 110 of the single suction blower 108 and the fuselage outlet 104, and an air purifying filter 109 is arranged inside the blowout air chamber 111. When the airframe 106 is operated, fresh air outside the outdoor 112 is sucked into the airframe 106 through the suction-side duct 103, passes through the single suction blower 108, the air purifying filter 109, and the blowout-side duct 105, and then the indoor 113 Was being aired.
JP 2001-272074 A

  In such a duct fan which is a conventional ventilation device for a living space, a wide air path is required for increasing the suction flow component in the direction of the central axis of the impeller at the fan suction port. In addition, when the air purifying filter is placed in the blow-off air chamber, the fan discharge is exerted in order to reduce the pressure loss caused by the main discharge airflow from the fan discharge port colliding with a part of the air purifying filter and exert the fan capacity. The blowing air chamber was widely configured while keeping the distance from the outlet to the air purifying filter. Moreover, in order to reduce pressure loss, it was necessary to enlarge the area of the air purifying filter, and the height of the blowing air chamber was also configured to be large. There exists a subject that the height dimension of the airframe inevitably became high by these. Also, in recent high-rise apartments, there is a market trend to increase the floor to ceiling materials in order to make the room look wider, and it is difficult to secure the dimensions of the ceiling, and duct fans that enter the ceiling with a low dimension are required. Yes.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a thin and compact duct fan while incorporating a clean air filter and a single suction blower to ensure a necessary air volume.

  In order to achieve the above object, the duct fan of the present invention has a flow path from the airframe inlet to the airframe outlet in the box-shaped airframe having two sides facing the airframe inlet and the airframe outlet. The single suction fan is provided in the flow path, the single suction blower is a duct fan in which a motor is disposed on the fan suction port side, and the motor faces the flow path. The fan casing side plate on the side opposite to the motor of the blower is opposed to the vicinity of the top plate of the fuselage, and a filter partition wall having a ventilation opening is provided between the fuselage suction port and the fan suction port of the single suction blower. An air purifying filter for purifying air is disposed on the surface of the filter partition wall on the fan suction port side, and the air cleaning filter is disposed so as to be inclined downward toward the fan suction port.

  Another means is that the lower end of the filter on the fan casing side of the air purifying filter is located between the end of the fan casing on the airframe inlet and the fan inlet.

  Another means is that a fan casing inclined part inclined downward toward the fan suction port is provided at the end of the fan casing on the airframe suction port side.

  Further, another means has an intake air chamber between the airframe suction port and the filter partition wall for reducing a collision resistance of the airflow from the airframe suction port at the filter partition wall.

  Further, the other means includes a motor mounting leg for fixing the motor to the fan suction port side of the single suction blower, and the filter side motor mounting leg gap between the fan suction port and the motor mounting leg is disposed on the anti-filter side motor. It is wider than the mounting leg gap.

  Another means is to provide a filter inspection lid below the air cleaning filter.

  In another means, a filter partition is provided as an insertion guide for the air cleaning filter, and the air cleaning filter is detachable.

  Moreover, another means arrange | positions the coarse dust insect net on the lower surface side of the air purifying filter.

  Another means is to fix a coarse dust net on the filter partition.

  Further, the other means is provided with a detachable motor inspection lid below the motor, a motor inspection lid inclined portion along the inclination of the air purification filter is provided on the air purification filter side of the motor inspection lid, and the air purification filter The air purifying filter is detachable.

  In another aspect, a filter guide is disposed on the upper surface of the air purification filter, the air purification filter is sandwiched and fixed between the filter partition wall and the filter guide, and the filter partition wall is attached to the filter when the air purification filter is detached. It is configured to be separated from the guide.

  According to the present invention, the air speed distribution on the surface of the air cleaning filter is arranged between the fan suction port of the single suction type blower and the air suction port by being inclined downward toward the fan suction port. The pressure loss is reduced and the fan suction port increases the suction flow component in the direction of the central axis of the impeller, reducing the fan suction resistance. It is possible to provide a duct fan that has the effect of being thinned to fit.

  The duct fan according to claim 1 of the present invention has a flow path from the fuselage inlet to the fuselage outlet in a box-shaped fuselage having two sides facing the fuselage inlet and the fuselage outlet, A single suction blower is provided in the flow path, the single suction blower is a duct fan in which a motor is disposed on the fan suction port side, and the motor faces the flow path, and the single suction blower of the single suction blower A filter partition wall provided with a ventilation partition between the air inlet of the airframe and the fan air inlet of the one-sided blower is provided so that the fan casing side plate on the side opposite to the motor faces the vicinity of the top plate of the airframe. An air purifying filter for purifying air is arranged on the surface of the partition wall on the side of the fan suction port, and the air purifying filter is disposed so as to be inclined downward toward the fan suction port. As a result, the air velocity distribution on the surface of the air purifying filter is made uniform, pressure loss is reduced, and the fan suction resistance is increased by increasing the suction flow component in the direction of the central axis of the impeller at the fan suction port. It is possible to reduce the height of the airframe while exhibiting the above.

  The duct fan according to claim 2 of the present invention is configured such that the lower end of the filter on the fan casing side of the air purifying filter is positioned between the fan casing end on the airframe inlet side and the fan inlet. is there. As a result, the suction flow component in the direction of the central axis of the impeller can be increased at the fan suction port to reduce the fan suction resistance, and the length of the fuselage can be reduced while exhibiting the fan capability. Has an effect.

  According to a third aspect of the present invention, the duct fan is configured by providing a fan casing inclined portion that is inclined downward toward the fan suction port at the end of the fan casing on the airframe suction port side. Thereby, the airflow which passed the air purifying filter becomes easy to flow into a fan inlet, and it has the effect | action that the resistance of a suction part can be decreased and an air volume can be ensured.

  The duct fan according to claim 4 of the present invention has a suction air chamber between the airframe suction port and the filter partition wall, which has a suction air chamber for reducing a collision resistance of the airflow from the airframe suction port at the filter partition wall. It has been done. Thereby, the collision resistance at the filter partition wall of the airflow that has passed through the airframe suction port can be reduced, the resistance of the suction portion can be reduced, and the air volume can be secured.

  The duct fan according to claim 5 of the present invention includes a motor mounting leg for fixing a motor to the fan suction port side of the single suction fan, and a filter side motor mounting between the fan suction port and the motor mounting leg. The leg clearance is wider than the anti-filter side motor mounting leg clearance. Thereby, the airflow which passed the air purifying filter becomes easy to flow into a fan inlet, and it has the effect | action that the resistance of a suction part can be decreased and an air volume can be ensured.

  The duct fan according to claim 6 of the present invention is configured by providing a filter inspection lid below the air cleaning filter. Thereby, it has the effect | action that it can clean, without removing an air purifying filter.

  The duct fan according to claim 7 of the present invention is configured such that a filter partition is provided as an insertion guide for the air cleaning filter, and the air cleaning filter is detachable. Thereby, it has the effect | action that the attachment or detachment at the time of taking out an air purifying filter becomes easy, and the fall at the time of taking out an air purifying filter can be prevented.

  The duct fan according to claim 8 of the present invention is constructed by arranging a coarse dust insect net on the lower surface side of the air purification filter. Thus, the air purification filter is prevented from being clogged, and large dust can be cleaned without removing the air purification filter.

  The duct fan according to claim 9 of the present invention is configured by fixing a coarse dust insect net on a filter partition wall. Thereby, it has the effect | action that a material can be reduced.

  The duct fan according to claim 10 of the present invention is provided with a detachable motor inspection lid below the motor, and the motor inspection lid inclined portion along the inclination of the air purification filter on the air purification filter side of the motor inspection lid. Is provided as an insertion guide for the air purification filter, and the air purification filter is detachable. Thereby, it has the effect | action that the attachment or detachment at the time of taking out an air purifying filter can be performed easily.

  In the duct fan according to claim 11 of the present invention, a filter guide is disposed on the upper surface of the air purification filter, the air purification filter is sandwiched and fixed between the filter partition wall and the filter guide, and the air purification filter is removed. The filter partition is separated from the filter guide. As a result, the air purifying filter is firmly fixed, the ventilation gaps other than the air purifying filter are eliminated, the small dust can be prevented from flowing out to the air outlet, and the air purifying filter can be easily attached and detached when taking out. Have

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

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1 or FIG. FIG. 1 is a side perspective view of the first embodiment of the present invention, and FIG. 2 is a side view showing an installation state of the first embodiment of the present invention.

  As shown in FIG. 1, a box-shaped body 3 is provided on two surfaces facing a body inlet 1 and a body outlet 2. The airframe 3 is provided with a suction adapter 5 that connects a suction side duct 4 to the airframe suction port 1 and a blowout adapter 7 that connects a blowout side duct 6 to the airframe blowout port 2. Inside the airframe 3, there is a flow path 8 from the airframe inlet 1 to the airframe outlet 2, and the flow path 8 includes a single suction blower 9, an air purifying filter 10, and a ventilation opening 11. A filter partition 12 is built in. The single suction blower 9 has a motor 15 with an impeller 14 attached to the fan suction port 13 side, and the fan casing side plate 16 on the side opposite to the motor of the single suction blower 9 is provided near the top plate 17 of the fuselage 3. It is attached to face. The fan discharge port 18 of the single-suction blower 9 is provided with a fan discharge port partition wall 19 having an opening of the fan discharge port 18 facing the fuselage outlet plate 20. A blowout air chamber 23, which is a space surrounded by the airframe outlet plate 20, the top plate 17, the bottom plate 21, and the lateral plate 22, is provided between the fan discharge port 18 and the airframe outlet plate 20. ing.

  Further, the filter partition wall 12 is disposed between the body suction port 1 provided on the body suction port plate 24 and the fan suction port 13 of the single suction type blower 9, and the fan suction port of the filter partition wall 12. The air purifying filter 10 for purifying air is located on the surface on the 13th side, and the air purifying filter 10 is disposed so as to be inclined downward toward the fan suction port 13.

  The motor 15 is disposed in the flow path 8, and the single suction fan 9 uses a fan casing width 25 that is smaller than the diameter of the fuselage inlet 1.

  The shape of the fan discharge port partition wall 19 is an integral structure formed by bending the extension of the fan casing side plate 26 on the motor side of the single suction blower 9 from the fan discharge port 18 toward the bottom plate 21. Therefore, the number of parts can be reduced, and inexpensive manufacturing is possible.

  When the duct fan is operated in the above configuration, as shown in FIG. 2, the single-suction type blower 9 built in the airframe 3 installed in the ceiling 27 is operated, and the air outside the room 28 causes the suction-side duct 4 to flow. The air is sucked into the single suction blower 9 through the air purification filter 10 in the flow path 8 and exhausted into the room 29 through the blowout duct 6 through the blowout air chamber 23.

  As shown in FIG. 1, the flow of airflow during the operation passes through the air purification filter 10 while the airflow sucked from the airframe suction port 1 flows obliquely downward along the inclination of the air purification filter 10. Then, it flows in the direction of the motor lower part 30, is sucked in the direction of the central axis of the impeller 14 of the single suction blower 9, and flows into the fan suction port 13. The airflow blown out from the fan discharge port 18 passes through the blowout air chamber 23 and blows out toward the machine body outlet 2.

  Here, since the main suction airflow 31 sucked from the airframe suction port 1 has a structure in which the air purification filter 10 is inclined downward toward the fan suction port 13, the air purification filter The air purification filter 10 passes through the air purification filter 10 while flowing downward along the inclination of 10 without causing a pressure loss due to the airflow being partly offset in a part of the air purification filter 10. It is possible to make the wind speed distribution on the surface uniform and to reduce the pressure loss.

  Further, the air flow through the main filter 32 after passing through the air purifying filter 10 has a structure in which the air purifying filter 10 is disposed so as to be inclined downward toward the fan suction port 13. By flowing out from the lower part of the motor and flowing in the direction of the motor lower part 30, it is possible to increase the suction flow component in the direction of the central axis of the impeller 14 at the fan suction port 13 and reduce the fan suction resistance. Can demonstrate.

  Further, since the air purification filter 10 is arranged to be inclined downward toward the fan suction port 13, the height dimension 35 of the airframe is set to be higher than the filter height dimension 33 of the air purification filter 10. Can be small.

  Note that the smaller the pressure loss characteristic of the air cleaning filter 10 is, the smaller the filter attachment angle 34 to the airframe 3 is, the more the main filter passage airflow 32 can be increased, and the suction flow in the direction of the central axis of the impeller 14 The height dimension 35 of the fuselage can be reduced while increasing the components and reducing the suction resistance of the fan.

  Further, in order to reduce the thickness of the airframe 3, when the single suction fan 9 has a smaller blade diameter using the fan casing width 25 that is smaller than the diameter of the airframe suction port 1, the blade diameter is increased and the air volume is secured. By increasing the area of the fan suction port 13 and approaching the area of the air purification filter 10, uneven wind speed in the vicinity of the air purification filter 10 can be suppressed, and pressure loss can be reduced and air volume can be secured.

  From these facts, it is possible to provide a duct fan that can reduce the height 35 of the airframe while exhibiting fan capability.

  Further, since the single suction blower 9 is arranged so as to be biased toward the top surface from the center of the fuselage suction port 1, the air entered from the fuselage suction port 1 does not directly hit the back surface of the single suction blower 9. Since it is configured, the resistance of the suction portion can be reduced, and furthermore, the space on the front surface of the fan suction port 13 necessary for sucking air in the direction of the central axis of the impeller 14 can be secured. The height dimension 35 of the airframe can be suppressed while ensuring the air volume.

  When maintenance is performed, as shown in FIG. 2, a ceiling inspection port 37 provided in the ceiling material 36 is opened directly below the body 3, the bottom plate 21 is removed, and the inside of the body 3 is inspected. Since the motor 15 is disposed on the bottom plate 21 side, the bottom plate 21 can be removed from the ceiling inspection port 37, and the motor 15, the impeller 14, and the air purification filter 10 can be inspected. A good duct fan can be provided.

  In addition, the effect is the same even if the said body blower outlet 2 is made into two or more according to the number of rooms of a house.

(Embodiment 2)
FIG. 3 is a side perspective view of the second embodiment of the present invention. The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 3, the filter lower end portion 38 on the fan casing side of the air purification filter 10 is located between the fan casing end portion 39 on the airframe inlet side and the fan inlet port 13.

  Further, a fan casing inclined portion 40 that is inclined downward toward the fan inlet 13 is provided at the fan casing end 39 on the airframe inlet side.

  When the duct fan is operated in the above-described configuration, the filter lower end portion 38 on the fan casing side is positioned between the fan casing end portion 39 on the airframe inlet side and the fan inlet port 13, and the air purifying filter 10 is In the vicinity of the suction port 13, the main filter passing air flow 32 increases the suction flow component in the direction of the central axis of the impeller 14 at the fan suction port 13, so that the fan suction resistance can be reduced and the fan performance is exhibited. However, it is possible to reduce the length of the aircraft.

  The fan casing end 39 on the airframe inlet side is provided with a fan casing inclined portion 40 that is inclined downward toward the fan inlet 13 so that the airflow that has passed through the air cleaning filter 10 is inclined to the fan casing. Since the air is rectified along the portion 40 and easily flows to the fan suction port 13, the duct fan can be provided in which the resistance of the suction portion can be reduced and the air volume can be secured.

  The shape of the fan casing inclined portion 40 is such that the extension of the fan casing side plate 26 on the motor side of the single suction fan 9 is bent from the fan casing end 39 on the airframe inlet side toward the top plate 17. Therefore, it is possible to reduce the number of parts and to manufacture at a low cost.

(Embodiment 3)
FIG. 4 is a side perspective view of the third embodiment of the present invention. The same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 4, a suction air chamber 41 is formed between the airframe suction port 1 and the filter partition wall 12 to reduce the collision resistance of the airflow from the airframe suction port 1 at the filter partition wall 12. is doing.

  When the duct fan is operated in the above configuration, the main suction airflow 31 of the airflow that has passed through the airframe suction port 1 is rectified diagonally downward along the inclination of the air purification filter 10 while passing through the suction air chamber 41. Therefore, it is possible to provide a duct fan that can reduce the resistance caused by the main suction air flow 31 colliding with the filter partition wall 12, reduce the resistance of the suction portion, and ensure the air volume.

(Embodiment 4)
FIG. 5 is a side perspective view of the fourth embodiment of the present invention. The same components as those in FIGS.

  As shown in FIG. 5, a motor mounting leg 42 for fixing the motor 15 is provided on the fan suction port 13 side of the single suction fan 9, and a filter side between the fan suction port 13 and the motor mounting leg 42 is provided. The motor mounting leg gap 43 is made wider than the anti-filter side motor mounting leg gap 44.

  A filter inspection lid 45 is detachably provided with a screw or the like below the air purification filter 10 on the bottom plate 21.

  Further, the filter partition 12 is provided as an insertion guide for the air cleaning filter 10, and the air cleaning filter 10 is detachable.

  When the duct fan is operated in the above configuration, the filter-side motor mounting leg gap 43 is made wider than the anti-filter-side motor mounting leg gap 44, so that the main filter passing air flow 32 that has passed through the air cleaning filter 10 is sucked into the fan. It becomes easy to flow to the mouth 13, resistance of the suction portion can be reduced, and air volume can be secured.

  The filter inspection lid 45 is detachably provided with a screw or the like below the air purification filter 10 on the bottom plate 21, and when the filter inspection lid 45 is removed, the air that becomes an upwind and is a dirty surface. Since the lower surface of the cleaning filter 10 can be confirmed, the cleaning can be performed without removing the air cleaning filter 10.

  Further, since the air cleaning filter 10 that is on the wind side and is a dirty surface is on the lower surface side, dust such as large insects collides with the air cleaning filter 10 and then falls on the filter inspection lid 45, and the filter inspection lid 45. It becomes an insect trap and can easily clean large dust.

  Further, the filter partition wall 12 is arranged substantially parallel to the inclination of the air cleaning filter 10 and is provided as an insertion guide for the air cleaning filter 10 so that the air cleaning filter 10 can be inserted and removed along the filter partition wall 12. When the air purifying filter 10 is inserted, the air purifying filter 10 is placed and held on the filter partition wall 12, so that the air purifying filter 10 can be detached when the air purifying filter 10 is replaced. It is possible to provide a duct fan that is easy and can prevent the air purification filter 10 from dropping when it is removed.

(Embodiment 5)
FIG. 6 is a side perspective view of the fifth embodiment of the present invention. The same components as those in FIGS.

  As shown in FIG. 6, a coarse dust insect net 46 is disposed on the lower surface side of the air purification filter 10, and a filter inspection lid 45 is detachably provided with a screw or the like below the air purification filter 10 of the bottom plate 21. ing.

  The coarse dust screen 46 is fixed to the filter partition 12.

  A motor inspection lid 47 is detachably provided with a screw or the like below the motor 15, and a motor inspection lid inclined portion 48 along the inclination of the air purification filter 10 is provided on the air purification filter 10 side of the motor inspection lid 47. Provided as an insertion guide for the air purification filter 10, the air purification filter 10 is detachable.

  In the above configuration, since the coarse dust proof net 46 made of a wire mesh or the like is disposed on the lower surface side of the air purification filter 10 that is windward and dirty, large dust such as insects is It is collected by the coarse dust screen 46 to prevent the air purification filter 10 from being clogged, and large dust can be cleaned without removing the air purification filter 10.

  Further, since the filter partition 12 fixes the coarse dust screen 46, it is not necessary to provide a separate member for supporting the coarse dust screen 46, and it can also be used as the support for the air cleaning filter 10. And material can be reduced.

  The motor inspection lid 47 is detachably provided with a screw or the like below the motor 15, and the motor inspection lid inclined portion 48 is arranged on the air purification filter 10 side substantially in parallel with the inclination of the air purification filter 10. Provided as an insertion guide for the air purifying filter 10, the air purifying filter 10 is detachable so as to be inserted and removed along the inclined portion 48 of the motor inspection lid, and the air purifying filter 10 is replaced. It is possible to provide a duct fan that can be easily attached and detached at the time of removal.

(Embodiment 6)
FIG. 7 is a side perspective view of the sixth embodiment of the present invention. The same components as those in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, a filter guide 49 is disposed on the upper surface of the air purification filter 10, the air purification filter 10 is fixed between the filter partition wall 12 and the filter guide 49, and the air purification filter 10 is detached. At this time, the filter partition 12 is formed so as to be separated from the filter guide 49.

  In the above configuration, the air cleaning filter 10 is sandwiched between the filter partition wall 12 and the filter guide 49, and the air cleaning filter 10 is firmly fixed, and a gap between the filter partition wall 12 and the air cleaning filter 10 is eliminated, and the filter partition wall Since the air that has passed through the ventilation opening 11 of 12 eliminates the ventilation gap so that it does not pass through other than the air cleaning filter 10, small dust is collected by the air cleaning filter 10 and is sent to the air outlet 2. Can be prevented from leaking.

  Further, since the filter partition 12 is separated from the filter guide 49 when the air purification filter 10 is detached, the air purification filter 10 can be detachable in a wide working space on the filter partition 12; It is possible to provide a duct fan that can be easily attached and detached when the air purification filter 10 is exchanged.

  The filter partition 12 is preferably connected to the body 3 by a hinge or the like so that the filter partition 12 does not fall off when the air cleaning filter 10 is replaced.

  In addition to air supply ventilation in general houses, facility equipment can be cooled by using the air blown from the air outlet, reducing the pressure loss of the air flow and securing the air volume, and can be installed in a thin and compact installation. It can also be applied to the use of air blowing.

Side perspective view of the duct fan according to the first embodiment of the present invention. Side view showing the installation state of the duct fan Side perspective view of a duct fan according to Embodiment 2 of the present invention Side perspective view of a duct fan according to Embodiment 3 of the present invention Side perspective view of a duct fan according to Embodiment 4 of the present invention Side perspective view of a duct fan according to a fifth embodiment of the present invention Side perspective view of a duct fan according to Embodiment 6 of the present invention Side perspective view of a conventional duct fan Side view showing the installation state of the duct fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airframe inlet 2 Airframe outlet 3 Airframe 8 Flow path 9 Single suction type blower 10 Air purifying filter 11 Ventilation opening 12 Filter partition 13 Fan inlet 15 Motor 16 Anti-motor side fan casing side plate 17 Top plate 38 Fan casing side Lower end portion of the filter 39 Fan casing end portion on the air inlet side 40 Fan casing inclined portion 41 Suction air chamber 42 Motor mounting leg 43 Filter side motor mounting leg clearance 44 Anti-filter side motor mounting leg clearance 45 Filter inspection lid 46 Net 47 Motor inspection lid 48 Motor inspection lid inclined part 49 Filter guide

Claims (11)

The box-shaped airframe having two airframe inlets and airframe outlets facing each other has a flow path from the airframe inlet to the airframe outlet, and a single suction fan is provided in the flow path. The suction type blower is a duct fan in which a motor is disposed on the fan suction port side, and the motor faces the flow path, and the fan casing side plate on the side opposite to the motor of the single suction type blower is attached to the top of the body. A filter partition wall provided with a ventilation opening is provided between the body suction port and the fan suction port of the single-suction blower so as to face the vicinity of the face plate, and air is supplied to the surface of the filter partition on the fan suction port side. A duct fan, wherein an air purifying filter to be cleaned is disposed, and the air purifying filter is disposed so as to be inclined downward toward the fan suction port. 2. The duct fan according to claim 1, wherein the lower end of the filter on the fan casing side of the air purifying filter is located between the end of the fan casing on the airframe inlet and the fan inlet. The duct fan according to claim 1 or 2, wherein a fan casing inclined portion inclined downward toward the fan intake port is provided at an end of the fan casing on the airframe intake port side. The suction air chamber which reduces the collision resistance in the said filter partition of the airflow from the said fuselage suction port between a body suction inlet and a filter partition is characterized by the above-mentioned. Duct fan. A motor mounting leg that fixes the motor to the fan suction port side of the single suction fan is provided, and the filter side motor mounting leg gap between the fan suction port and the motor mounting leg is wider than the anti-filter side motor mounting leg gap. The duct fan according to any one of claims 1 to 4. The duct fan according to any one of claims 1 to 5, wherein a filter inspection lid is provided below the air cleaning filter. 7. The duct fan according to claim 6, wherein a filter partition is provided as an insertion guide for the air cleaning filter, and the air cleaning filter is detachable. The duct fan according to any one of claims 1 to 7, wherein a coarse dust insect net is arranged on a lower surface side of the air cleaning filter. 9. The duct fan according to claim 8, wherein a coarse dust insect net is fixed to the filter partition wall. A detachable motor inspection lid is provided below the motor, a motor inspection lid inclined portion along the inclination of the air purification filter is provided on the air purification filter side of the motor inspection lid, serving as an insertion guide for the air purification filter, and the air The duct fan according to any one of claims 6 to 9, wherein the cleaning filter is detachable. A filter guide is disposed on the upper surface of the air purification filter, the air purification filter is sandwiched and fixed between the filter partition wall and the filter guide, and the filter partition wall is separated from the filter guide when the air purification filter is detached. The duct fan according to claim 1, wherein the duct fan is a fan.

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