WO2012098882A1 - 天井埋込形換気扇 - Google Patents

天井埋込形換気扇 Download PDF

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Publication number
WO2012098882A1
WO2012098882A1 PCT/JP2012/000292 JP2012000292W WO2012098882A1 WO 2012098882 A1 WO2012098882 A1 WO 2012098882A1 JP 2012000292 W JP2012000292 W JP 2012000292W WO 2012098882 A1 WO2012098882 A1 WO 2012098882A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceiling
top surface
motor
ventilation fan
circuit case
Prior art date
Application number
PCT/JP2012/000292
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
聡 香川
林　英樹
太一 角野
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011009652A external-priority patent/JP5633385B2/ja
Priority claimed from JP2011012613A external-priority patent/JP5786123B2/ja
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN201280002153.9A priority Critical patent/CN103026142B/zh
Priority to US13/812,966 priority patent/US20130143481A1/en
Publication of WO2012098882A1 publication Critical patent/WO2012098882A1/ja

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/10—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with air supply, or exhaust, through perforated wall, floor or ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/0326—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans

Definitions

  • the present invention relates to a ceiling-embedded ventilation fan.
  • the conventional ceiling-mounted ventilation fan covers the connection terminal with walls against the ingress of dripping water from the attic, and the connection terminal insertion port is arranged in the recessed part.
  • Patent Document 1 a conventional ceiling-mounted ventilation fan will be described with reference to FIGS.
  • FIG. 14 is an exploded perspective view showing the structure of a conventional ceiling embedded ventilation fan disclosed in Patent Document 1
  • FIG. 15 is a perspective view of the ceiling embedded ventilation fan.
  • the ceiling-embedded ventilation fan includes a frame 103, a motor 104, a fan 105, a casing 106, a decorative panel 107, a control circuit 108, and a circuit case 109.
  • the frame 103 has a suction port 101 corresponding to the opening of the ceiling plate on the lower surface and a discharge port 102 on the side surface.
  • the motor 104 is fixed to the top surface of the frame 103.
  • the fan 105 is driven by the motor 104.
  • the casing 106 covers the periphery of the fan 105.
  • the decorative panel 107 is detachably mounted so as to cover the lower surface opening of the frame 103 from the room side.
  • the control circuit 108 is mounted on the top surface of the frame 103 and drives and controls the motor 104.
  • the circuit case 109 houses the control circuit 108.
  • FIG. 16 is a view showing the vicinity of a connection opening of a circuit case of a conventional ceiling-embedded ventilation fan.
  • a connection terminal 110 for connecting the control circuit 108 and the power supply wire 113 is provided on the side surface of the circuit case 109.
  • the upper part of the connection terminal 110 is covered with the eaves 111, and the insertion port 112 of the connection terminal 110 is provided in the recessed part.
  • the dew condensation water 115 transmitted from the power supply wire 113 remains attached to the bottom 114 of the eaves.
  • the condensed water 115 may enter the connection terminal 110.
  • Patent Document 2 discloses a connector connecting portion for connecting to a control circuit of a ceiling-embedded ventilation fan.
  • FIG. 17 is an exploded view showing a DC motor of a conventional ceiling-embedded ventilation fan disclosed in Patent Document 2. As shown in FIG. As shown in FIG. 17, the connector connection part 157 provided in the DC motor 155 is provided in parallel with the top plate 116 shown in FIG. The connector connection unit 157 is connected to the control circuit 108 shown in FIG.
  • the control circuit 108 for controlling the DC motor 155 is complicated and large, and therefore there is a problem that it cannot be installed in the space inside the frame 103. It was. Furthermore, since the size of the ceiling-embedded ventilation fan is required to be reduced, there is a problem that the size of the frame 103 on the top surface becomes narrow and it is difficult to attach the circuit case 109 to the top surface.
  • a ceiling-embedded ventilation fan includes a frame having a top surface, side surfaces, and a bottom surface, a suction port on the bottom surface and a discharge port on the side surface, a motor fixed to the top surface, and a fan driven by the motor And a casing that covers the periphery of the fan, a control circuit that is mounted on the top surface and controls the drive of the motor, and a circuit case that houses the control circuit.
  • the connection that connects the control circuit and the power supply wire to the side of the circuit case
  • a terminal connection opening is provided, covering the upper part of the connection opening and the side of the circuit case with eaves.
  • the ceiling-embedded ventilation fan of the present invention is configured by a top surface, a side surface, and a bottom surface, a frame having a suction port on the bottom surface and a discharge port on the side surface, a DC motor fixed to the top surface, and a DC motor Fan, a fan casing that covers the periphery of the fan, a control circuit that is mounted on the top surface and controls the drive of the DC motor, and a circuit case that houses the control circuit.
  • the DC motor is connected to the control circuit through a connector connection.
  • the connector connecting portion is provided vertically upward with respect to the top surface.
  • the connector connection part is vertically upward with respect to the top surface of the frame, the connector faces vertically with respect to the top surface when the connector is inserted. Therefore, the use area on the top surface is reduced, and the circuit case is mounted on the top surface.
  • FIG. 1 is an exploded perspective view showing a configuration of a ceiling-embedded ventilation fan according to Embodiment 1 of the present invention.
  • FIG. 2 is a front view of the insertion hole of the connection terminal of the ceiling-embedded ventilation fan.
  • FIG. 3 is a view showing the inside of the ceiling-embedded ventilation fan.
  • FIG. 4 is a diagram showing the flow of water transmitted through the power supply wire of the ceiling-embedded ventilation fan.
  • FIG. 5 is a view of the circuit case of the ceiling-embedded ventilation fan as viewed from below.
  • FIG. 6 is a view showing the vicinity of the drain hole of the circuit case of the ceiling-embedded ventilation fan.
  • FIG. 1 is an exploded perspective view showing a configuration of a ceiling-embedded ventilation fan according to Embodiment 1 of the present invention.
  • FIG. 2 is a front view of the insertion hole of the connection terminal of the ceiling-embedded ventilation fan.
  • FIG. 3 is
  • FIG. 7 is an exploded view showing a configuration of a ceiling-embedded ventilation fan according to the second embodiment of the present invention.
  • FIG. 8 is a top view showing a configuration of the ceiling-embedded ventilation fan.
  • FIG. 9 is a view showing a connector connection portion of a DC motor of the ceiling-embedded ventilation fan.
  • FIG. 10 is a perspective view of a DC motor of the ceiling-embedded ventilation fan.
  • FIG. 11 is an exploded view showing the configuration of the circuit case of the ceiling-embedded ventilation fan.
  • FIG. 12 is a detailed view showing the height of the connector connecting portion of the ceiling-embedded ventilation fan.
  • FIG. 13 is a perspective view showing the internal configuration of the circuit case of the ceiling-embedded ventilation fan.
  • FIG. 14 is an exploded perspective view showing a configuration of a conventional ceiling-embedded ventilation fan.
  • FIG. 15 is a perspective view of the ceiling-embedded ventilation fan.
  • FIG. 16 is a view showing the vicinity of the connection opening of the circuit case of the ceiling-embedded ventilation fan.
  • FIG. 17 is an exploded view showing a DC motor of the ceiling-embedded ventilation fan.
  • FIG. 1 is an exploded perspective view showing a configuration of a ceiling-embedded ventilation fan according to Embodiment 1 of the present invention.
  • the ceiling-embedded ventilation fan shown in FIG. 1 is installed by being embedded in the back of the room (not shown).
  • the ceiling-embedded ventilation fan includes a frame 3, a motor 5, a fan 6, a casing 7, a decorative panel 8, a control circuit 9, and a circuit case 10.
  • the frame 3 includes a top surface 4, a side surface 23, and a lower surface 24.
  • the frame 3 has the suction port 1 corresponding to the opening of the ceiling plate on the lower surface 24 and the discharge port 2 on the side surface 23.
  • the motor 5 is fixed to the top surface 4 of the frame 3 by two screws, and a direct current is input thereto.
  • the fan 6 is a sirocco type driven by the motor 5.
  • the casing 7 covers the periphery of the fan 6.
  • the decorative panel 8 is attached so as to cover the suction port 1 from the room side, and is detachably attached by a spring 21.
  • the control circuit 9 is mounted on the top surface 4 and adjusts the voltage applied to the motor 5 to drive and control the rotational speed of the motor 5.
  • the circuit case 10 houses the control circuit 9.
  • FIG. 2 is a front view of the insertion hole of the connection terminal of the ceiling embedded ventilation fan according to the first embodiment of the present invention
  • FIG. 3 is a diagram showing the inside of the ceiling embedded ventilation fan.
  • the connection opening 13 of the connection terminal 12 for connecting the control circuit 9 and the power supply wire 11 is provided on the side surface 25 of the circuit case.
  • the upper side of the U-shaped connection opening 13 and the side surface 25 of the circuit case are covered with the eaves 14.
  • the bottom surface 14 a of the eaves 14 is also used by the top surface 4.
  • the bottom portion 14 a is disposed at a position lower than the insertion hole 15 of the connection opening 13, and a space 26 exists below the eaves 14.
  • the four insertion holes 15 of the connection terminal 12 are provided, and the speed of the motor 5 is adjusted. Further, when the insertion hole 15 is viewed from the end surface 16 of the eaves 14 in parallel to the top surface 4, a draining plate 17 is provided below the insertion hole 15. A gradient is provided by making the thickness of the draining plate 17 on the connection terminal 12 side thicker than the opposite side. That is, the draining plate 17 has a downward slope from the connection terminal 12 side toward the power supply wire 11 side.
  • FIG. 4 is a diagram showing the flow of water transmitted through the power supply wire of the ceiling-embedded ventilation fan according to the first embodiment of the present invention.
  • the dew condensation water 22 generated in the back of the ceiling is transmitted through the power supply wire 11
  • the dew condensation water 22 comes into contact with the draining plate 17 so that water droplets increase.
  • the condensed water 22 is dropped on the top surface 4 along the gradient of the draining plate 17 or is dropped below the eaves 14, that is, on the top surface 4. Since the top surface 4 is located below the insertion hole 15 and has a distance, water does not reach the height of the insertion hole 15, and water can be prevented from entering the connection terminal 12.
  • FIG. 5 is a view of the circuit case of the ceiling-embedded ventilation fan according to the first embodiment of the present invention as viewed from below.
  • a wall 18 is disposed inside the eaves 14 so as to partition the insertion holes 15 from the height of the draining plate 17 toward the upper eaves 14. That is, in the space 26 covered by the eaves 14 between the connection opening 13 and the side surface 25 of the circuit case, the wall 18 is disposed from the height of the draining plate 17 toward the eaves 14.
  • the wall 18 is provided with a gradient by making the connection terminal 12 side thicker than the opposite side.
  • the wall 18 is disposed at a position between the insertion hole 15 and the insertion hole 15 from the connection terminal 12 side to the draining plate 17 side.
  • the wall 18 has a thickness on the connection terminal 12 side that is thicker than a thickness on the draining plate 17 side.
  • FIG. 6 is a view showing the vicinity of the drain hole of the circuit case of the ceiling-embedded ventilation fan according to the first embodiment of the present invention.
  • the circuit case 10 is provided with a drain hole 19 at a position below the connection terminal 12. Ribs 20 are formed so as to have an upward slope from the outlet 19 a of the drain hole 19 toward the inside of the circuit case 10.
  • the dew condensation water 22 generated inside the circuit case 10 goes down the rib 20 and drains to the outside of the circuit case 10 when the amount of water reaches a certain amount.
  • the water dripped from the draining plate 17 is difficult to enter the circuit case 10, the water can be prevented from adhering to the control circuit 9 in the circuit case 10.
  • FIG. 7 is an exploded view showing a configuration of a ceiling-embedded ventilation fan according to the second embodiment of the present invention.
  • the ceiling-embedded ventilation fan shown in FIG. 7 is attached by being embedded in the ceiling of the room.
  • the ceiling-mounted ventilation fan includes a frame 53, a DC motor 55, a centrifugal fan 56, a fan casing 57, a decorative panel 58, a control circuit 59, and a circuit case 60.
  • the DC motor 55 is provided with a connector connecting portion 61 that connects to the control circuit 59.
  • the connector connecting portion 61 is provided vertically upward with respect to the top surface 54 of the frame 53.
  • the frame 53 includes a top surface 54, a side surface 83, and a bottom surface 84.
  • the frame 53 has a suction port 51 corresponding to the opening of the ceiling plate on the lower surface 84 and a discharge port 52 on the side surface 83.
  • the DC motor 55 is fixed to the top surface 54 of the frame 53.
  • the centrifugal blower fan 56 is driven by a DC motor 55.
  • the fan casing 57 covers the periphery of the centrifugal blower fan 56.
  • the decorative panel 58 covers the lower surface opening of the frame 53 from the room side and is detachably attached to the frame 53.
  • the control circuit 59 is mounted on the top surface 54 and controls the driving of the DC motor 55.
  • the circuit case 60 houses a control circuit 59.
  • FIG. 8 is a top view showing a configuration of a ceiling-embedded ventilation fan according to the second embodiment of the present invention.
  • a screw portion 62 is provided in the DC motor 55.
  • the screw portion 62 is disposed so that a line connecting the connector connecting portion 61 and the center of the DC motor 55 and a straight line connecting the two screw portions 62 are orthogonal to each other.
  • the DC motor 55 is fixed to the top surface 54 with a screw portion 62 using two screws.
  • a control circuit 59 is formed around the DC motor 55 so as to surround the DC motor 55.
  • a connector portion 63 provided in the control circuit 59 is disposed in the vicinity of the connector connection portion 61 of the DC motor 55.
  • the circuit case 60 is formed in the same shape as the control circuit 59.
  • Two screwing portions 64 on the diagonal of the top surface 54 are arranged so as to be outside the outer shape of the centrifugal fan 56, and the circuit case 60 is fixed to the top surface 54 with screws.
  • the DC motor 55 is attached obliquely with respect to the straight portion 65 of the circuit case 60.
  • the gap between the circuit case 60 and the DC motor 55 is made as small as possible, and the projected area when the circuit case 60 is viewed from above is made smaller than the top surface 54.
  • a connector connection portion 61 and a cover 68 that covers the upper side of the connector 73 connected to the connector connection portion 61 are disposed.
  • FIG. 9 is a diagram showing a connector connection portion of a DC motor of a ceiling embedded ventilation fan according to a second embodiment of the present invention
  • FIG. 10 is a perspective view of the DC motor of the ceiling embedded ventilation fan.
  • the connector connecting portion 61 includes four connector pins 66 provided so as to face vertically upward with respect to the top surface 54 (shown by arrows in FIG. 9), Part 67.
  • the connector part 63 of the control circuit 59 shown in FIG. 8 and the connector connecting part 61 are connected using the connector pin 66 and the locking part 67.
  • FIG. 11 is an exploded view showing the configuration of the circuit case of the ceiling-embedded ventilation fan according to the second embodiment of the present invention.
  • the circuit case 60 includes a lower case 69 and an upper case 70.
  • the lower case 69 and the upper case 70 are fixed by engaging a lower locking portion 71 provided in the lower case 69 and an upper engaging portion 72 provided in the upper case 70.
  • the lower engaging portion 71 and the upper engaging portion 72 are provided outside the circuit case 60.
  • FIG. 12 is a detailed view showing the height of the connector connecting portion of the ceiling-embedded ventilation fan according to the second embodiment of the present invention
  • FIG. 13 is a perspective view showing the internal configuration of the circuit case of the ceiling-embedded ventilation fan.
  • the cover 68 and the circuit case 60 share the upper case 70 and the side wall 75 and are integrally formed.
  • the cover 68 includes a side surface portion 76, and the side surface portion 76 is provided so as to surround the DC motor 55 shown in FIG.
  • the height of the circuit case 60 and the cover 68 are the same.
  • the height of the circuit case 60 and the cover 68 from the top surface 54 to the base of the lead wire 74 is set so that the lead wire 74 for connecting the connector is not bent excessively when the connector 73 is connected (see FIG. 12).
  • the lead wire 74 is exposed from the connector 73.
  • the connector connecting portion 61 is directed vertically upward rather than horizontally with respect to the top surface 54. For this reason, when the connector 73 is inserted, the connector 73 is oriented perpendicularly to the top surface 54 and the use area on the top surface 54 is reduced, so that the control circuit 59 can be mounted in the space on the top surface 54.
  • the connector connecting portion 61 is covered with a cover 68. Therefore, for example, even when condensed water drops from the ceiling, the condensed water adheres to the cover 68, so that the condensed water does not adhere to the connector connecting portion 61.
  • the cover 68 covers the periphery of the DC motor 55, water does not adhere to the connector connecting portion 61 even when condensed water flows from other than above the DC motor 55. As a result, tracking or the like does not occur with respect to the electrical connection portion, and safety is improved.
  • circuit case 60 and the cover 68 are integrally formed. And since the side part of the cover 68 is shared with the circuit case 60, an extra space is reduced. In addition, since there are no gaps such as seams, water intrusion is completely prevented.
  • the circuit case 60 is smaller than the top surface 54 in the projected area when the ceiling-embedded ventilation fan is viewed from above. Therefore, the DC motor 55 is removed together with the fan casing 57 together with the top surface 54 from the indoor side. As a result, the DC motor 55 is easily removed when the motor is replaced, and the maintainability is improved.
  • the screwing portion 64 of the circuit case 60 is disposed outside the outer shape of the centrifugal blower fan 56. Therefore, it is possible to prevent the screw that fixes the circuit case 60 from hitting the centrifugal blower fan 56, thereby improving safety.
  • a lower locking portion 71 and an upper engaging portion 72 are provided outside the circuit case 60. Therefore, the gap between the DC motor 55 and the circuit case 60 can be narrowed, and the use area on the top surface 54 is reduced.
  • circuit case 60 and the cover 68 are formed at the same height, resin molding is facilitated. Further, since the upper surfaces of the circuit case 60 and the cover 68 are flat, labeling and engraving on the upper surface of the circuit case 60 is possible.
  • the cover 68 covers the connector 73 and the lead wire 74 connected to the connector connecting portion 61 from above and from the side.
  • the lead wire 74 is not stabbed by a rat or the like in the back of the ceiling, no electric leakage occurs, and safety is improved.
  • the ceiling-embedded ventilation fan of the present invention is widely used for air conditioners that are embedded in a ceiling and directly connected to a power supply wire.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2012/000292 2011-01-20 2012-01-19 天井埋込形換気扇 WO2012098882A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201280002153.9A CN103026142B (zh) 2011-01-20 2012-01-19 顶棚埋入式换气扇
US13/812,966 US20130143481A1 (en) 2011-01-20 2012-01-19 Ceiling-embedded ventilation fan

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011009652A JP5633385B2 (ja) 2011-01-20 2011-01-20 天井埋込形換気扇
JP2011-009652 2011-01-20
JP2011012613A JP5786123B2 (ja) 2011-01-25 2011-01-25 天井埋込形換気扇
JP2011-012613 2011-01-25

Publications (1)

Publication Number Publication Date
WO2012098882A1 true WO2012098882A1 (ja) 2012-07-26

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ID=46515517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/000292 WO2012098882A1 (ja) 2011-01-20 2012-01-19 天井埋込形換気扇

Country Status (3)

Country Link
US (1) US20130143481A1 (zh)
CN (1) CN103026142B (zh)
WO (1) WO2012098882A1 (zh)

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GB2500011B (en) 2012-03-06 2016-07-06 Dyson Technology Ltd A Humidifying Apparatus
GB2500005B (en) 2012-03-06 2014-08-27 Dyson Technology Ltd A method of generating a humid air flow
GB2500017B (en) 2012-03-06 2015-07-29 Dyson Technology Ltd A Humidifying Apparatus
GB2510195B (en) 2013-01-29 2016-04-27 Dyson Technology Ltd A fan assembly
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GB2528704A (en) 2014-07-29 2016-02-03 Dyson Technology Ltd Humidifying apparatus
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GB2528708B (en) * 2014-07-29 2016-06-29 Dyson Technology Ltd A fan assembly
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