WO2021089121A1 - Fan apparatus and fan - Google Patents

Fan apparatus and fan Download PDF

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Publication number
WO2021089121A1
WO2021089121A1 PCT/EP2019/080237 EP2019080237W WO2021089121A1 WO 2021089121 A1 WO2021089121 A1 WO 2021089121A1 EP 2019080237 W EP2019080237 W EP 2019080237W WO 2021089121 A1 WO2021089121 A1 WO 2021089121A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
air extractor
duct body
extractor duct
expansions
Prior art date
Application number
PCT/EP2019/080237
Other languages
French (fr)
Inventor
Anshuman SHEVADE
Bruno PROCHETTE
Jörg KILIAN
Björn Keerl
Original Assignee
Mahle International Gmbh
Mahle Engineering Services India Private Limited
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
Application filed by Mahle International Gmbh, Mahle Engineering Services India Private Limited filed Critical Mahle International Gmbh
Priority to PCT/EP2019/080237 priority Critical patent/WO2021089121A1/en
Publication of WO2021089121A1 publication Critical patent/WO2021089121A1/en

Links

Classifications

    • 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
    • F24F13/20—Casings or covers
    • 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
    • F24F13/02—Ducting arrangements
    • 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
    • F24F13/20—Casings or covers
    • F24F2013/205—Mounting a ventilator fan therein

Definitions

  • the invention relates to a fan apparatus, in particular to an axial fan, according to Claim 1 and to a fan.
  • Fan apparatuses have been known for a long time and are usually employed in order to provide a fluid flow, for example in order to ensure motor cooling ventilation in motor vehicles.
  • the known fan apparatuses regularly comprise a fan which is equipped with a fan wheel arranged in the fan housing.
  • the object of the invention therefore lies in providing an improved or at least another embodiment of a fan apparatus and an improved or at least another fan.
  • this object is solved in particular through the subjects of the independent claims.
  • Advantageous embodiments are subject of the dependent claims and of the description.
  • the basic idea of the invention is in reducing the flow vortices that are occuring downstream of the fan wheel in that air duct, that is connected downstream of the fan, which is equipped with radial expansions.
  • the fan apparatus which is in particular an axial fan, comprises a fan which comprises a fan housing, which comprises one or more fan wheels for generating a fluid flow.
  • the fan housing has a suction inlet for sucking in fluid and a blow-out vent for blowing out fluid.
  • the fan apparatus comprises an air extractor duct body which along its main extension direction defines a duct longitudinal axis.
  • the air extractor duct body is an elastic hose body or a rigid tubular body.
  • the air extractor duct body is produced from a plastic material or a composite material.
  • the air extractor duct body at any rate comprises a duct inlet and a duct outlet, so that it can be flowed through by fluid in its entirety.
  • the air extractor duct body is arranged with the duct inlet up front, in particular touchingly and without unnecessary intermediate gap, on the blow-out vent of the fan housing, so that the fluid flow provided by the fan wheels can flow out of the fan housing into the air extractor duct body.
  • the air extractor duct body in at least one radial direction orientated orthogonally with respect to the duct longitudinal axis, laterally protrudes over the blow-out vent, so that quasi a clear flow cross section of the duct inlet is larger in terms of area than a clear flow cross section of the blow-out vent.
  • the duct inlet of the air extractor duct body has a larger duct diameter, in particular a duct inner diameter, than the blow-out vent of the fan housing.
  • the air extractor duct body can be practically equipped with at least one, two, three or more radial expansions.
  • the expansions preferably protrude in a radial direction, in particular orthogonally with respect to the duct longitudinal axis, over the blow-out vent, enlarging a clear flow cross section of the air extractor duct body.
  • expansions are formed as separate expansion bodies and arranged on the air extractor duct body in a firmly bonded, positively connected or non-positively connected manner.
  • the expansion bodies can also be realised as additional components which can be subsequently attached to existing air extractor duct bodies, such as retrofit components.
  • the expansions are practically formed in one piece with the air extractor duct body. At any rate it can be practical when the expansions extend longitudinally along the duct longitudinal axis of the air extractor duct body on the air extractor duct body. For example it is conceivable that the expansions extend over the entire axial length of the air extractor duct body or only over half the axial length of the same.
  • a relatively good optimisation of the pressure losses can be achieved when practically at least two expansions are arranged on the air extractor duct body, which in pairs are located diametrically opposite one another on the air extractor duct body. It is conceivable, furthermore, that multiple expansion pairs are provided on the air extractor duct body, for example two expansion pairs whose expansions are each located diametrically opposite one another in pairs on the air extractor duct body.
  • the expansions are formed by pocket-like expansion bodies and/or bulge-like curved bodies.
  • the expansion bodies and/or the bulge-like curved bodies can each enlarge the duct inlet in a radial direction, in particular orthogonally with regard to the duct longitudinal axis.
  • the air extractor duct body comprises at least one flange for attaching the air extractor duct body to the fan housing.
  • at least one, two or more expansions can be directly arranged on the flange.
  • a further basic idea of the invention lies in providing a fan with an air extractor duct body.
  • a fan comprises one or more fan wheels, which are arranged within a fan housing and serve for sucking-in fluid and define a rotor axis.
  • an air extractor duct body is provided, which is touchingly arranged on the fan housing.
  • the air extractor duct body forms a flow guide body for influencing and guiding a fluid flow in the fan housing and in the air extractor duct body.
  • the invention relates to a fan apparatus with a fan comprising a fan housing for generating a fluid flow.
  • the fan housing comprises a suction inlet for sucking-in fluid and a blow-out fan for blowing out fluid.
  • the fan apparatus furthermore, comprises an air extractor duct body comprising a duct inlet and a duct outlet, which along its main extension direction defines a duct longitudinal axis.
  • the duct inlet of the air extractor duct body is arranged on the blow-out vent of the fan housing. It is substantial that the air extractor duct body, in at least one radial direction that is orientated orthogonally with respect to the duct longitudinal axis, protrudes over the blow-out vent.
  • Fig. 1 a perspective view of a fan apparatus
  • Fig. 2 a sectional view of the fan apparatus from Fig. 1 according to a section plan ll-ll shown in Fig. 1.
  • a fan apparatus altogether marked with reference number 1 is shown, such as is used for example in the automotive field.
  • Such fan apparatuses 1 are employed for example in motor cooling systems or fan units in order to ensure ventilation.
  • the fan apparatus 1 which is merely indicated schematically in Fig. 1 has a fan 3 and an air extractor duct body 7 for optimising pressure losses within the fan apparatus 1 , wherein the fan 3 comprises a fan housing 2 and a fan wheel 16 arranged therein for generating a fluid flow 4.
  • the fan housing 2 is indicated by a dotted cuboid. It has a suction inlet 5 indicated with a dotted line for sucking in for example raw air or air that is coming from a heat exchanger and a blow-out vent 6 likewise indicated with dotted line for blowing out.
  • the fan wheel 16 is likewise indicated by dotted lines and in terms of drive connected for example to an electric motor which is not shown, so that during the operation of the fan apparatus 1 the fluid flow 4 can be generated, which in Fig. 1 is indicated by arrows..
  • fluid in the exemplary embodiment shown in Fig. 1 , can flow from an atmosphere surrounding the fan apparatus 1 through the suction inlet 5 into the fan housing 2 of the fan 3. Following this, the fluid is accelerated by the fan wheel 16, wherein it can flow out through the blow-out vent 6 and reach the air extractor duct body 7.
  • the air extractor duct body 7 comprises a duct basic body 18 for guiding the fluid flow 4 which is not described in more detail and, along its main extension direction, defines a duct longitudinal axis 10, which can for example be a straight line or a bent curve, such as in the example of Fig. 1.
  • the duct longitudinal axis 10 is indicated by a dash-dotted line.
  • the duct basic body 18 has at least one duct inlet 8 and at least one duct outlet 9.
  • the duct outlet 9 can be arranged on a frame 20 on the downstream side indicated dotted in Fig. 1 , for example in order to fix the air extractor body 7 on the floor or the like.
  • the air extractor duct body 7 is detachably connected for example to the fan housing 2, in particular, the air extractor duct body 7 touchingly lies against the fan housing 2, practically, the duct inlet 8 touchingly lies against the blow-out vent 6.
  • the extractor air duct body 7 comprises at least one flange 15, with which attaching the air extractor duct body 7 to the fan housing 2 is relatively easily possible.
  • the air extractor duct body 7, with respect to the duct longitudinal axis 10 laterally protrudes over the blow-out vent 6 in at least one radial direction 12 that is orientated orthogonally with respect to the duct longitudinal axis 10.
  • a further radial direction 12’ is exemplarily drawn in next to the radial direction 12, in which the air extractor duct body 7 can protrude over the blow-out vent 6 alternatively to the radial direction 12 or additionally to the radial direction 12.
  • a clear flow cross section 13 of the air extractor duct body 7 relative to a clear flow cross section 19 of the fan housing 2 is enlarged, which is evident for example in Fig. 2.
  • the expansions 11 form separate expansion bodies 14, which in the present exemplary embodiment are formed in one piece with the air extractor duct body 7 and extend along the duct longitudinal axis 10 on the air extractor body 7.

Abstract

The invention relates to a fan apparatus (1) with a fan (3) comprising a fan housing (2) for generating a fluid flow (4). The fan housing (2) comprises a suction inlet (5) for sucking in fluid and a blow-out vent (6) for blowing out fluid. The fan apparatus (1), furthermore, comprises an air extractor duct body (7) comprising a duct inlet (8) and a duct outlet (9), which along its main extension direction defines a duct longitudinal axis (10). The duct inlet (8) of the air extractor duct body (7) is arranged on the blow-out vent (6) of the fan housing (2). It is substantial that the air extractor duct body (7) protrudes in at least one radial direction (12) that is orientated orthogonally with respect to the duct longitudinal axis (10), over the blow-out vent (6).

Description

Fan apparatus and fan
The invention relates to a fan apparatus, in particular to an axial fan, according to Claim 1 and to a fan.
Fan apparatuses have been known for a long time and are usually employed in order to provide a fluid flow, for example in order to ensure motor cooling ventilation in motor vehicles. For this purpose, the known fan apparatuses regularly comprise a fan which is equipped with a fan wheel arranged in the fan housing.
During the operation of such fan apparatuses, flow vortices, in particular radial flow components regularly develop downstream of the fan wheel in the speed profile of the fluid, which result in pressure losses within the fan apparatus and resulting in a reduced fan efficiency. In order to counteract the development of flow vortices downstream of the fan wheel, the use of guide vanes is usual. Flere, the guide vanes known from the prior art are arranged downstream of the fan wheel and flow-favourably interact with the fluid flow. Because of this, pressure losses are reduced resulting in an increased fan efficiency. Flowever, the known guide vanes require additional installation space downstream of the fan wheel so that fan apparatuses equipped with the usual guide vanes are altogether relatively large and bulky in the axial direction. From a design point of view, a more compact design of the fan apparatuses is desirable since for example material costs can be saved and tool costs reduced.
The object of the invention therefore lies in providing an improved or at least another embodiment of a fan apparatus and an improved or at least another fan. In the present invention, this object is solved in particular through the subjects of the independent claims. Advantageous embodiments are subject of the dependent claims and of the description.
The basic idea of the invention is in reducing the flow vortices that are occuring downstream of the fan wheel in that air duct, that is connected downstream of the fan, which is equipped with radial expansions.
For this purpose it is provided that the fan apparatus, which is in particular an axial fan, comprises a fan which comprises a fan housing, which comprises one or more fan wheels for generating a fluid flow. Here, the fan housing has a suction inlet for sucking in fluid and a blow-out vent for blowing out fluid. Furthermore, the fan apparatus comprises an air extractor duct body which along its main extension direction defines a duct longitudinal axis. Practically, the air extractor duct body is an elastic hose body or a rigid tubular body. Further practically, the air extractor duct body is produced from a plastic material or a composite material. The air extractor duct body at any rate comprises a duct inlet and a duct outlet, so that it can be flowed through by fluid in its entirety. During the operation of the fan apparatus, the air extractor duct body is arranged with the duct inlet up front, in particular touchingly and without unnecessary intermediate gap, on the blow-out vent of the fan housing, so that the fluid flow provided by the fan wheels can flow out of the fan housing into the air extractor duct body. For diminishing pressure losses it is provided that the air extractor duct body, in at least one radial direction orientated orthogonally with respect to the duct longitudinal axis, laterally protrudes over the blow-out vent, so that quasi a clear flow cross section of the duct inlet is larger in terms of area than a clear flow cross section of the blow-out vent. Alternatively it can also be said that the duct inlet of the air extractor duct body has a larger duct diameter, in particular a duct inner diameter, than the blow-out vent of the fan housing. This has the surprising effect that the flow vortices in the fan apparatus induced downstream of the fan wheels are reduced. This offers the advantage that the undesirable pressure losses are reduced, acoustic behaviour is improved and the fan efficiency is increased.
In order to achieve a further reduction of the flow vortices within the fan apparatus, the air extractor duct body can be practically equipped with at least one, two, three or more radial expansions. Here, the expansions preferably protrude in a radial direction, in particular orthogonally with respect to the duct longitudinal axis, over the blow-out vent, enlarging a clear flow cross section of the air extractor duct body. By way of this, the pressure losses in the fan apparatus can be further reduced.
Practically, the above expansions are formed as separate expansion bodies and arranged on the air extractor duct body in a firmly bonded, positively connected or non-positively connected manner. The expansion bodies can also be realised as additional components which can be subsequently attached to existing air extractor duct bodies, such as retrofit components.
Alternatively, the expansions are practically formed in one piece with the air extractor duct body. At any rate it can be practical when the expansions extend longitudinally along the duct longitudinal axis of the air extractor duct body on the air extractor duct body. For example it is conceivable that the expansions extend over the entire axial length of the air extractor duct body or only over half the axial length of the same.
A relatively good optimisation of the pressure losses can be achieved when practically at least two expansions are arranged on the air extractor duct body, which in pairs are located diametrically opposite one another on the air extractor duct body. It is conceivable, furthermore, that multiple expansion pairs are provided on the air extractor duct body, for example two expansion pairs whose expansions are each located diametrically opposite one another in pairs on the air extractor duct body.
Practically, the expansions are formed by pocket-like expansion bodies and/or bulge-like curved bodies. The expansion bodies and/or the bulge-like curved bodies can each enlarge the duct inlet in a radial direction, in particular orthogonally with regard to the duct longitudinal axis.
Practically, the air extractor duct body comprises at least one flange for attaching the air extractor duct body to the fan housing. Practically, at least one, two or more expansions can be directly arranged on the flange.
A further basic idea of the invention lies in providing a fan with an air extractor duct body. For this purpose, a fan comprises one or more fan wheels, which are arranged within a fan housing and serve for sucking-in fluid and define a rotor axis. For optimising pressure losses within the fan an air extractor duct body is provided, which is touchingly arranged on the fan housing. The air extractor duct body forms a flow guide body for influencing and guiding a fluid flow in the fan housing and in the air extractor duct body.
In summary it should be noted: the invention relates to a fan apparatus with a fan comprising a fan housing for generating a fluid flow. The fan housing comprises a suction inlet for sucking-in fluid and a blow-out fan for blowing out fluid. The fan apparatus, furthermore, comprises an air extractor duct body comprising a duct inlet and a duct outlet, which along its main extension direction defines a duct longitudinal axis. The duct inlet of the air extractor duct body is arranged on the blow-out vent of the fan housing. It is substantial that the air extractor duct body, in at least one radial direction that is orientated orthogonally with respect to the duct longitudinal axis, protrudes over the blow-out vent.
Further important features and advantages of the invention are obtained from the subclaims, from the drawings and from the associated figure description by way of the drawings.
It is to be understood that the features mentioned above and still to be explained in the following cannot only be used in the respective combination stated but also in other combinations or by themselves without leaving the scope of the present invention.
Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein same reference numbers relate to same or similar or functionally same components.
It shows, in each case schematically
Fig. 1 a perspective view of a fan apparatus and
Fig. 2 a sectional view of the fan apparatus from Fig. 1 according to a section plan ll-ll shown in Fig. 1.
In Fig. 1 and 2, a fan apparatus altogether marked with reference number 1 is shown, such as is used for example in the automotive field. Such fan apparatuses 1 are employed for example in motor cooling systems or fan units in order to ensure ventilation.
The fan apparatus 1 which is merely indicated schematically in Fig. 1 has a fan 3 and an air extractor duct body 7 for optimising pressure losses within the fan apparatus 1 , wherein the fan 3 comprises a fan housing 2 and a fan wheel 16 arranged therein for generating a fluid flow 4.
In Fig. 1 , the fan housing 2 is indicated by a dotted cuboid. It has a suction inlet 5 indicated with a dotted line for sucking in for example raw air or air that is coming from a heat exchanger and a blow-out vent 6 likewise indicated with dotted line for blowing out. The fan wheel 16 is likewise indicated by dotted lines and in terms of drive connected for example to an electric motor which is not shown, so that during the operation of the fan apparatus 1 the fluid flow 4 can be generated, which in Fig. 1 is indicated by arrows.. At any rate, fluid, in the exemplary embodiment shown in Fig. 1 , can flow from an atmosphere surrounding the fan apparatus 1 through the suction inlet 5 into the fan housing 2 of the fan 3. Following this, the fluid is accelerated by the fan wheel 16, wherein it can flow out through the blow-out vent 6 and reach the air extractor duct body 7.
The air extractor duct body 7 comprises a duct basic body 18 for guiding the fluid flow 4 which is not described in more detail and, along its main extension direction, defines a duct longitudinal axis 10, which can for example be a straight line or a bent curve, such as in the example of Fig. 1. In Fig. 1 , the duct longitudinal axis 10 is indicated by a dash-dotted line. The duct basic body 18 has at least one duct inlet 8 and at least one duct outlet 9. The duct outlet 9 can be arranged on a frame 20 on the downstream side indicated dotted in Fig. 1 , for example in order to fix the air extractor body 7 on the floor or the like.
During the operation of the fan apparatus 1 , the air extractor duct body 7 is detachably connected for example to the fan housing 2, in particular, the air extractor duct body 7 touchingly lies against the fan housing 2, practically, the duct inlet 8 touchingly lies against the blow-out vent 6. In the present exemplary embodiment, the extractor air duct body 7 comprises at least one flange 15, with which attaching the air extractor duct body 7 to the fan housing 2 is relatively easily possible. According to the invention it is provided that the air extractor duct body 7, with respect to the duct longitudinal axis 10, laterally protrudes over the blow-out vent 6 in at least one radial direction 12 that is orientated orthogonally with respect to the duct longitudinal axis 10. In Fig. 2, a further radial direction 12’ is exemplarily drawn in next to the radial direction 12, in which the air extractor duct body 7 can protrude over the blow-out vent 6 alternatively to the radial direction 12 or additionally to the radial direction 12.
In the exemplary embodiment according to Fig. 1 it is provided, furthermore, to form two radial expansions 11 which each protrude over the blow-out vent 6 in the radial direction 12 and are arranged on the air extractor duct body 7 located diametrically opposite one another. By way of this, a clear flow cross section 13 of the air extractor duct body 7 relative to a clear flow cross section 19 of the fan housing 2 is enlarged, which is evident for example in Fig. 2. Practically, the expansions 11 form separate expansion bodies 14, which in the present exemplary embodiment are formed in one piece with the air extractor duct body 7 and extend along the duct longitudinal axis 10 on the air extractor body 7.
*****

Claims

Claims
1. A fan apparatus (1 ), in particular an axial fan,
- with a fan (3) comprising a fan housing (2) for generating a fluid flow (4), wherein the fan housing (2) comprises a suction inlet (5) for sucking in fluid and a blow-out vent (6) for blowing out fluid,
- with an air extractor duct body (7) comprising a duct inlet (8) and a duct outlet (9) for discharging fluid which, along its main extension direction, defines a duct longitudinal axis (10),
- wherein the duct inlet (8) of the air extractor duct body (7) is arranged on the blow-out vent (6) of the fan housing (2),
- and wherein the air extractor duct body (7), in at least one radial direction (12) that is orientated orthogonally with respect to the duct longitudinal axis (10), laterally protrudes over the flow-out vent (6).
2. The fan apparatus (1 ) according to Claim 1 , characterized
- in that the air extractor duct body (7) comprises at least one, two, three or more radial expansions (11 ), which in each case protrude over the blow-out vent (6) in a radial direction (12) and enlarge a clear flow cross section (13) of the air extractor duct body (7).
3. The fan apparatus (1) according to Claim 1 or 2, characterized
- in that the expansions (11) are formed as separate expansion bodies (14) and are arranged on the air extractor duct body (7) in a firmly bonded, positively connected or non-positively connected manner.
4. The fan apparatus (1 ) according to Claim 2 or 3, characterized
- in that the expansions (11 ) are formed in one piece with the air extractor duct body (7).
5. The fan apparatus (1 ) according to any one of the Claims 2 to 4, characterized
- in that the expansions (11) extend longitudinally along the duct longitudinal axis (10) of the air extractor duct body (7) on the air extractor duct body (7).
6. The fan apparatus (1 ) according to any one of the Claims 2 to 5, characterized
- in that on the air extractor duct body (7) at least two expansions (11 ) are arranged, which are located diametrically opposite one another in pairs.
7. The fan apparatus (1 ) according to any one of the preceding claims, characterized
- in that the expansions (11) are formed by pocket-like expansion bodies (14), which each enlarge the duct inlet (8) in a radial direction (12).
8. The fan apparatus (1 ) according to any one of the preceding claims, characterized
- in that the expansions (11) are formed by bulge-like curved bodies (14), which each enlarge the duct inlet (8) in a radial direction (12).
9. The fan apparatus (1 ) according to any one of the preceding claims, characterized
- in that the air extractor duct body (7) comprises at least one flange (15) for attaching the air extractor duct body (7) to the fan housing (2), wherein at least one, two or more expansion bodies (11) are arranged on the flange (15).
10. A fan (3), in particular according to any one of the preceding claims, characterized
- in that the fan (3) comprises one or more fan wheels (16), which are arranged within a fan housing (2) and serve for sucking in fluid, wherein an air extractor duct body (7) is formed according to any one of the Claims 1 to 9 and touchingly arranged on the fan housing (2) and wherein the air extractor duct body (7) forms a flow guiding body for influencing a fluid flow (4) in the fan housing (2) and in the air extractor duct body (7).
*****
PCT/EP2019/080237 2019-11-05 2019-11-05 Fan apparatus and fan WO2021089121A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/080237 WO2021089121A1 (en) 2019-11-05 2019-11-05 Fan apparatus and fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/080237 WO2021089121A1 (en) 2019-11-05 2019-11-05 Fan apparatus and fan

Publications (1)

Publication Number Publication Date
WO2021089121A1 true WO2021089121A1 (en) 2021-05-14

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ID=68536816

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/080237 WO2021089121A1 (en) 2019-11-05 2019-11-05 Fan apparatus and fan

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308222A (en) * 1980-07-07 1981-12-29 Goettel Richard J Evaporative cooler
JPH0599444A (en) * 1991-10-09 1993-04-20 Daikin Ind Ltd Air conditioner
US20160131390A1 (en) * 2014-11-12 2016-05-12 Samsung Electronics Co., Ltd. Duct type air conditioning device and method for assembling and disassembling the same
US20160195106A1 (en) * 2012-12-25 2016-07-07 Panasonic Intellectual Property Management Co., Ltd. Centrifugal fan, and fan equipped with sound-muffling box and using centrifugal fan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308222A (en) * 1980-07-07 1981-12-29 Goettel Richard J Evaporative cooler
JPH0599444A (en) * 1991-10-09 1993-04-20 Daikin Ind Ltd Air conditioner
US20160195106A1 (en) * 2012-12-25 2016-07-07 Panasonic Intellectual Property Management Co., Ltd. Centrifugal fan, and fan equipped with sound-muffling box and using centrifugal fan
US20160131390A1 (en) * 2014-11-12 2016-05-12 Samsung Electronics Co., Ltd. Duct type air conditioning device and method for assembling and disassembling the same

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