CA1157902A - Casing for a fan-forced heater having a radial blower - Google Patents
Casing for a fan-forced heater having a radial blowerInfo
- Publication number
- CA1157902A CA1157902A CA000363857A CA363857A CA1157902A CA 1157902 A CA1157902 A CA 1157902A CA 000363857 A CA000363857 A CA 000363857A CA 363857 A CA363857 A CA 363857A CA 1157902 A CA1157902 A CA 1157902A
- Authority
- CA
- Canada
- Prior art keywords
- wall
- section
- front wall
- cover
- rear wall
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/02—Casings; Cover lids; Ornamental panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
- F24H3/0411—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between for domestic or space-heating systems
- F24H3/0417—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between for domestic or space-heating systems portable or mobile
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a casing for a fan-forced heater with a radial blower, provided with air-intake and air-discharge orifices and having an approximately box-type shape, said casing comprising a one-piece front wall-bottom section, a one-piece rear wall-cover section and two one-piece side wall-base sections, rim strips being provided along external longitudinal edges of the rear wall-cover section and of the front wall-bottom section which rim strips are spaced from the adjacent wall and are bent over inwardly through 180° and have at least one recess projecting lugs engaging the recesses being disposed on external longitudinal edges of the front wall-bottom section and of the rear wall-cover section whereby the side wall-bottom sections maybe mounted on the assembled front wall-bottom and rear wall-cover sections.
The present invention provides a casing for a fan-forced heater with a radial blower, provided with air-intake and air-discharge orifices and having an approximately box-type shape, said casing comprising a one-piece front wall-bottom section, a one-piece rear wall-cover section and two one-piece side wall-base sections, rim strips being provided along external longitudinal edges of the rear wall-cover section and of the front wall-bottom section which rim strips are spaced from the adjacent wall and are bent over inwardly through 180° and have at least one recess projecting lugs engaging the recesses being disposed on external longitudinal edges of the front wall-bottom section and of the rear wall-cover section whereby the side wall-bottom sections maybe mounted on the assembled front wall-bottom and rear wall-cover sections.
Description
l 15790,~
Tlle l~resent invention relates to a casing for a fan-forced l~eater with a radial blower which is provided with air-intake and air-discharge orifices and has an approximately box-type design.
Fan-forced heaters for wllich this ]cind of casing can be used are produced in large (~uantities and have a great variety of desiyns. These casings must satisfy aesthetic as well as functional requirements. Tlle relatively high demand for an aesthetic shape is due to the fact that these Ean-forced heaters are used primarily in housello]ds and frecluently remai,n mounted even ~ en they are not in use. ~i-th re~ard to their function they must be so designed that they can be easily produced and repaired in order to ma}~e it possi~le to calculate their costs arrowly. I~hen in use the heaters must be easy to handle and safe to opera-te and it is important that at a given electric power consumption a lleating efficiency as high as possible with uniform and noiseless discllarge of air is attained.
The present inven-tion provides a casing for a fan-forced heater whicll satisfies these fundamental requirements to the greatest extent possible.
In accordance with the present invention such a casing for a fan-forced heater of the kind mentioned at the outset comprises a one-piece front wall-bottom section, a one-piece rear wall-cover section and two side wall-base sections. A rim strip along the external longitudinal edges of the rear wall-cover section and of the front wall-bottom section, spaced from the wall concerne~, is l~ent inwardly by 1~30 and has at least one recess and at least one projecting lug on the e~ternal longitudi-nal edges of botll the front wall--bottom section and the rear wall-cover section, said lug engaging said recess. The side wall-base sections can be mounted on the assembled ~ront wall-~ottom and rcar wall-cover section.
~ 1~7902 In the casing of the prescnt invention the total casing comprises merely four sinyle compollents. This reduces the cost of its production and this also has afavourable effect when assem~ling -che casing since rear wall-cover section and front wall-bottom section can be joined in a very short ~ime, whereupon only tlle side wall-hase sections are mounted thereon. of course, it is possible to correspondingl,y interchange the shape of the front wall-bottom portion and of the rear wall-bottom portion.
Eecause of the integrated side wall-base sections no additional nase l~ortions have to be screwed to the casing, so that the expenditure for mounting is reduced while the casing is particularly sturdy and handy. The surface on which the base portion of the sicle wall-base section rests can be at a slight angle with the bottom of the front wall-bottom section so that the exhaust direction points slightly upwards.
Because the rearwall-cover section and the front wall-bottom section form a right angle these sections of the casing are particularly well accessible to mountiny the component parts, as for example, the rotor and switch. The advantages obtained in the original mounting have an equally positive effect when making repairs since the casing can be readily opened and closed and is easily accessible.
The side wall-base sections are preferably made of plas-tics and the front wall-bottom and rear wall-cover sections are preferably made of metal. Since the sections mentioned last are made of r,letal, the casing obtained is particularly strong and can be sub~ec-ted to thermal stress. However, since plastics can be used for tlle side wall-base sections, WlliCIl are lleated either slightly or not at all, not only can these parts by produced as one piece in an cxtrusion die at a favourable cost but a particu-larly elcgant and appealing shape is thus obtained.
It is particularly advantageous to provide at least one 1 1~790~
safety screw passiny through aliyned boreholes in the side wall-base section and rear wall-cover section. An additional lug for receiving the borehole can be disposed on the side wall-base section. T~le safety screws reliably allow the casing, which is sturdily assembled per se, from holding together even in case of impact stresses.
It has been lound to be favourable that the bent-over rim strip of the rear wall-cover section extends beyond the front wall of the front wall-bottom section like a beading. Likewise it is also favourable that on changing to the front wall, the bottom forms a forwardly curved beading. In this manner sharp edges are avoided, thus increasing the handiness and creating a nice shape on the one hand and protecting the sheet metal pro-trusions of the e~haust orifices by the projecting beadings on the other.
An intake orifice is preferably provided in the cover of the rear wall-cover section and in the bottom of the front wall-bottom section. An exhaust orifice is preferably provided in the front wall of the front wall-bottom section substantially immediately adjacent a side wall. A curved sheet metal part wllich is at right angles to both the cover and the bottom and partially tangentially encompasses the rotor extends from one side of the exhaust orifice to the other. This arrangement results in a particularly compact and space-saving construction.
- A large passage area for the intake air is provided by the intake orifices on both the top side and the bottom side. This has a favourable effect on the rate of air flow and reduces the intake noises to a minimum. The air flow is guided past the heater coils to the exllaust orifice, said sheet meta] part serving sirnultaneously as a thermal screen for the plastic side walls and the operating elements.
Recesses for receiving the operating elements are advan-~ 157~0~
tageously provided in the region of the side wall spaced from the intake orifices. In this region the operating elements are separated from the not zone by the curved sheet metal part. The space for the operating elements is formed, without any substan-tial additional requirement, by the variable curvature of the curved sheet metal part. This variable curvature is required for reasons of a laminar air circulation.
In a particular embodiment of the present invention the rotor is proviaed with blacies wllich are alternately bent out upwards and downwards at right angles to the plane of rotation.
This permits the air to be drawn in uniformly through the upper and lower intake orifices.
~inally it has been found that the curved sheet metal (e.g. iron) part and the rotor are held on the bottom of the rear wall-bottom section by common check screws. Because of this the total number of the required screw connections to be produced when assembling the casing can be kept extremely low so that the assembling time is reduced as compareci with that of other constructions and the expenditure for component parts for the mounting support is also reduced. Moreover the external appearance of the casing is not optically marred by a plurality of different screws and the largely smooth surface thus resulting can be cleaned more easily.
The present invention will be further illustrated by way of the accompanying drawings in which:
Figure 1 is a perspective view of a casing according to a preferred embodiment of the invention, Figure 2 is a horizontal section througll the casing and the inner component parts, Figure 3 is a partial perspective view of the front wall-bottom section and of the rear wall-cover section of the casing, and ~ ~7~0~
Figure 4 is a horizontal sec-tion through a si~e wall-base section of tile casing.
Referring to the drawi.ngs, -the casing cornprises four in~ividual sections, namely the front wall-bottom section 1, the rear wall--cover section 2 and the two side wall ~ottom sections 3 and 4.
The rear wall-cover section has a rounded transition between the cover 5 and the rear wall 6. A rim strip 9 and 10 along the free longitudinal edges 7 and 8 is bent over inwardly throuah 180. The bending radius is distinctly larger than the thickness of the sheet metal so that each bent-over rim strip 9 and 10 is spaced parallel to the cover 5 and to the rear wall 6 respectively. In the case of the rim strip 9 of the rear wall 6 the curvature is shaped li~e a circular segment over an angular range of 90 while the remaining 90 are attained by a largely vertical deflection. ~paced-apart rectangular recesses 21 are provided in the rim strips 9 and 10.
On changing from the front wall 11 to the bottom 12 the front wall-bottom section has a forwardly curved beading 13.
In the front wall 11 the exhaust orifice 15 comprising a plur-aiity of slots 14 is offsetwith respect to the side wall-base section 4. Si.milarly the intake orifice 16 is disposed in the cover 5 and tihe intake orifice 17 in the bottom 12. The free longitudinal edge 18 of the bottom 12 is curved sligh-tly upwards.
On the free longi.tudinal edge 18 of the bottom 12 and the free longitudinal edge 19 of the front wall 11 there are disposed sheet metal parts 20 approximately in extension of the corres-ponding surface. The width of said sheet metal parts and their mutual spacing corresponds to the recesses 21. By means of the sheet metal parts 20 and the recesses 21 the front wall-bottom section 1 can be found with the rear wall-cover section 2 without any effort. The two parts 1 and 2 are made of sheet metal.
Tl~e side wall-base sections 3 and 4 comprise an approximately rectangular portion 22 and a base lug 23, which has approximately the shape of an acute triangle. The approxi-mately rectangul,ar portion 22 has a handle trough 24. The external edge of the rectangular portion 22 is graduated inwardly.
Tn the region of t;~e rear wall the rectangular portion 22 has a ~rojecting lug 25, whicih is provided with a borehole 26.
On mounting the side wa]l-base sections 3 and 4 to the assembled sections 1 and 2 the graduation rests against the ]o sections 1 and 2 while the external edge 28 of the side wall-base sections 3 and 4 engages over the sections 1 and 2. The borehole 26 is aligned with a borellole 29 in the rear wall 6 so that the entire casing can be fixed with only two screws, (not shown). Tne side wall-base sections 3 and 4 are each made in one ~iece of plastics by injection molding.
The curved sheet metal part 30 and the blower motor are secured together with the rotor 31 to tne bottom 12. The curved sheet metal part extends from one side of the heating unit 32 to the otner. Said heating unit is in turn disposed directly ahead of the exhaust orifice 15. The sheet metal part 30 shown in Figure 2 has a rad'us of curvature which increases from the right to the left, said sheet metal part extending tangentially to the rotor over a specific length.
The rotor 31 has blades which are alternately bent upwards and downwards. The operating and indicating elements 33 and the built-in electric component parts 34 which are not shown in detail, are so lloused in the casing region, which is hollowed by the curvature of the bent sheet metal part 30, that they are protected against the heat.
Tlle l~resent invention relates to a casing for a fan-forced l~eater with a radial blower which is provided with air-intake and air-discharge orifices and has an approximately box-type design.
Fan-forced heaters for wllich this ]cind of casing can be used are produced in large (~uantities and have a great variety of desiyns. These casings must satisfy aesthetic as well as functional requirements. Tlle relatively high demand for an aesthetic shape is due to the fact that these Ean-forced heaters are used primarily in housello]ds and frecluently remai,n mounted even ~ en they are not in use. ~i-th re~ard to their function they must be so designed that they can be easily produced and repaired in order to ma}~e it possi~le to calculate their costs arrowly. I~hen in use the heaters must be easy to handle and safe to opera-te and it is important that at a given electric power consumption a lleating efficiency as high as possible with uniform and noiseless discllarge of air is attained.
The present inven-tion provides a casing for a fan-forced heater whicll satisfies these fundamental requirements to the greatest extent possible.
In accordance with the present invention such a casing for a fan-forced heater of the kind mentioned at the outset comprises a one-piece front wall-bottom section, a one-piece rear wall-cover section and two side wall-base sections. A rim strip along the external longitudinal edges of the rear wall-cover section and of the front wall-bottom section, spaced from the wall concerne~, is l~ent inwardly by 1~30 and has at least one recess and at least one projecting lug on the e~ternal longitudi-nal edges of botll the front wall--bottom section and the rear wall-cover section, said lug engaging said recess. The side wall-base sections can be mounted on the assembled ~ront wall-~ottom and rcar wall-cover section.
~ 1~7902 In the casing of the prescnt invention the total casing comprises merely four sinyle compollents. This reduces the cost of its production and this also has afavourable effect when assem~ling -che casing since rear wall-cover section and front wall-bottom section can be joined in a very short ~ime, whereupon only tlle side wall-hase sections are mounted thereon. of course, it is possible to correspondingl,y interchange the shape of the front wall-bottom portion and of the rear wall-bottom portion.
Eecause of the integrated side wall-base sections no additional nase l~ortions have to be screwed to the casing, so that the expenditure for mounting is reduced while the casing is particularly sturdy and handy. The surface on which the base portion of the sicle wall-base section rests can be at a slight angle with the bottom of the front wall-bottom section so that the exhaust direction points slightly upwards.
Because the rearwall-cover section and the front wall-bottom section form a right angle these sections of the casing are particularly well accessible to mountiny the component parts, as for example, the rotor and switch. The advantages obtained in the original mounting have an equally positive effect when making repairs since the casing can be readily opened and closed and is easily accessible.
The side wall-base sections are preferably made of plas-tics and the front wall-bottom and rear wall-cover sections are preferably made of metal. Since the sections mentioned last are made of r,letal, the casing obtained is particularly strong and can be sub~ec-ted to thermal stress. However, since plastics can be used for tlle side wall-base sections, WlliCIl are lleated either slightly or not at all, not only can these parts by produced as one piece in an cxtrusion die at a favourable cost but a particu-larly elcgant and appealing shape is thus obtained.
It is particularly advantageous to provide at least one 1 1~790~
safety screw passiny through aliyned boreholes in the side wall-base section and rear wall-cover section. An additional lug for receiving the borehole can be disposed on the side wall-base section. T~le safety screws reliably allow the casing, which is sturdily assembled per se, from holding together even in case of impact stresses.
It has been lound to be favourable that the bent-over rim strip of the rear wall-cover section extends beyond the front wall of the front wall-bottom section like a beading. Likewise it is also favourable that on changing to the front wall, the bottom forms a forwardly curved beading. In this manner sharp edges are avoided, thus increasing the handiness and creating a nice shape on the one hand and protecting the sheet metal pro-trusions of the e~haust orifices by the projecting beadings on the other.
An intake orifice is preferably provided in the cover of the rear wall-cover section and in the bottom of the front wall-bottom section. An exhaust orifice is preferably provided in the front wall of the front wall-bottom section substantially immediately adjacent a side wall. A curved sheet metal part wllich is at right angles to both the cover and the bottom and partially tangentially encompasses the rotor extends from one side of the exhaust orifice to the other. This arrangement results in a particularly compact and space-saving construction.
- A large passage area for the intake air is provided by the intake orifices on both the top side and the bottom side. This has a favourable effect on the rate of air flow and reduces the intake noises to a minimum. The air flow is guided past the heater coils to the exllaust orifice, said sheet meta] part serving sirnultaneously as a thermal screen for the plastic side walls and the operating elements.
Recesses for receiving the operating elements are advan-~ 157~0~
tageously provided in the region of the side wall spaced from the intake orifices. In this region the operating elements are separated from the not zone by the curved sheet metal part. The space for the operating elements is formed, without any substan-tial additional requirement, by the variable curvature of the curved sheet metal part. This variable curvature is required for reasons of a laminar air circulation.
In a particular embodiment of the present invention the rotor is proviaed with blacies wllich are alternately bent out upwards and downwards at right angles to the plane of rotation.
This permits the air to be drawn in uniformly through the upper and lower intake orifices.
~inally it has been found that the curved sheet metal (e.g. iron) part and the rotor are held on the bottom of the rear wall-bottom section by common check screws. Because of this the total number of the required screw connections to be produced when assembling the casing can be kept extremely low so that the assembling time is reduced as compareci with that of other constructions and the expenditure for component parts for the mounting support is also reduced. Moreover the external appearance of the casing is not optically marred by a plurality of different screws and the largely smooth surface thus resulting can be cleaned more easily.
The present invention will be further illustrated by way of the accompanying drawings in which:
Figure 1 is a perspective view of a casing according to a preferred embodiment of the invention, Figure 2 is a horizontal section througll the casing and the inner component parts, Figure 3 is a partial perspective view of the front wall-bottom section and of the rear wall-cover section of the casing, and ~ ~7~0~
Figure 4 is a horizontal sec-tion through a si~e wall-base section of tile casing.
Referring to the drawi.ngs, -the casing cornprises four in~ividual sections, namely the front wall-bottom section 1, the rear wall--cover section 2 and the two side wall ~ottom sections 3 and 4.
The rear wall-cover section has a rounded transition between the cover 5 and the rear wall 6. A rim strip 9 and 10 along the free longitudinal edges 7 and 8 is bent over inwardly throuah 180. The bending radius is distinctly larger than the thickness of the sheet metal so that each bent-over rim strip 9 and 10 is spaced parallel to the cover 5 and to the rear wall 6 respectively. In the case of the rim strip 9 of the rear wall 6 the curvature is shaped li~e a circular segment over an angular range of 90 while the remaining 90 are attained by a largely vertical deflection. ~paced-apart rectangular recesses 21 are provided in the rim strips 9 and 10.
On changing from the front wall 11 to the bottom 12 the front wall-bottom section has a forwardly curved beading 13.
In the front wall 11 the exhaust orifice 15 comprising a plur-aiity of slots 14 is offsetwith respect to the side wall-base section 4. Si.milarly the intake orifice 16 is disposed in the cover 5 and tihe intake orifice 17 in the bottom 12. The free longitudinal edge 18 of the bottom 12 is curved sligh-tly upwards.
On the free longi.tudinal edge 18 of the bottom 12 and the free longitudinal edge 19 of the front wall 11 there are disposed sheet metal parts 20 approximately in extension of the corres-ponding surface. The width of said sheet metal parts and their mutual spacing corresponds to the recesses 21. By means of the sheet metal parts 20 and the recesses 21 the front wall-bottom section 1 can be found with the rear wall-cover section 2 without any effort. The two parts 1 and 2 are made of sheet metal.
Tl~e side wall-base sections 3 and 4 comprise an approximately rectangular portion 22 and a base lug 23, which has approximately the shape of an acute triangle. The approxi-mately rectangul,ar portion 22 has a handle trough 24. The external edge of the rectangular portion 22 is graduated inwardly.
Tn the region of t;~e rear wall the rectangular portion 22 has a ~rojecting lug 25, whicih is provided with a borehole 26.
On mounting the side wa]l-base sections 3 and 4 to the assembled sections 1 and 2 the graduation rests against the ]o sections 1 and 2 while the external edge 28 of the side wall-base sections 3 and 4 engages over the sections 1 and 2. The borehole 26 is aligned with a borellole 29 in the rear wall 6 so that the entire casing can be fixed with only two screws, (not shown). Tne side wall-base sections 3 and 4 are each made in one ~iece of plastics by injection molding.
The curved sheet metal part 30 and the blower motor are secured together with the rotor 31 to tne bottom 12. The curved sheet metal part extends from one side of the heating unit 32 to the otner. Said heating unit is in turn disposed directly ahead of the exhaust orifice 15. The sheet metal part 30 shown in Figure 2 has a rad'us of curvature which increases from the right to the left, said sheet metal part extending tangentially to the rotor over a specific length.
The rotor 31 has blades which are alternately bent upwards and downwards. The operating and indicating elements 33 and the built-in electric component parts 34 which are not shown in detail, are so lloused in the casing region, which is hollowed by the curvature of the bent sheet metal part 30, that they are protected against the heat.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A casing for a fan-forced heater with a radial blower, provided with air-intake and air-discharge orifices and having an approximately box-type shape, said casing comprising a one-piece front wall-bottom section, a one-piece rear wall-cover section and two one-piece side wall-bottom sections, rim strips being provided along two external longitudinal edges of the rear wall-cover section and of the front wall-bottom section which rim strips are spaced from the adjacent wall and are bent over inwardly through 180° and have at least one recess, projecting lugs engaging the recesses being disposed on two adjacent external longitudinal edges of the front wall-bottom section and of the rear wall-cover section whereby the side wall-bottom sections may be mounted on the assembled front wall-bottom and rear wall-cover sections.
2. A casing according to claim 1, in which the side wall-base sections are made of plastics and the front wall-bottom section and the rear wall-cover section are made of metal.
3. A casing according to claim 1, having at least one safety screw passing through aligned boreholes in the side wall-base sections and at least one of the rear wall-cover section and the front wall-bottom section.
4. A casing according to claim 1, 2 or 3, in which the bent-over rim strip of the rear wall-cover section extends beyond the front wall of the front wall-bottom section as a beading.
5. A casing according to claim 1, in which an intake orifice is disposed in the cover of the rear wall-cover section and an intake orifice is disposed in the bottom of the front wall-bottom section an exhaust orifice being disposed in the front wall of the front wall-bottom section substantially directly adjacent a side wall base section and a bent sheet metal part partially tangentially encompasses a rotor and is disposed at right angles to cover and bottom and extends from one side of the exhaust orifice to the other.
6. A casing according to claim 5 in which recesses for receiving operating elements are provided in the region of the side wall-base section spaced from the intake orifices.
7. A casing according to claim 5 in which the rotor is provided with blades alternately bent over upwards and down-wards at right angles to the plane of rotation.
8. A casing according to claim 7 in which the bent sheet metal part and the rotor are held on the bottom of the front wall-bottom section by common check screws.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3029406.5 | 1980-08-02 | ||
| DE19803029406 DE3029406A1 (en) | 1980-08-02 | 1980-08-02 | Fan heater housing with radial-flow fan - has front bottom part, rear lid part, and two side wall foot parts, with edge portions spaced and bent over in specified manner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157902A true CA1157902A (en) | 1983-11-29 |
Family
ID=6108775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363857A Expired CA1157902A (en) | 1980-08-02 | 1980-11-03 | Casing for a fan-forced heater having a radial blower |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1157902A (en) |
| DE (1) | DE3029406A1 (en) |
| ZA (1) | ZA811908B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900228A (en) * | 1989-02-14 | 1990-02-13 | Airflow Research And Manufacturing Corporation | Centrifugal fan with variably cambered blades |
| US4917572A (en) * | 1988-05-23 | 1990-04-17 | Airflow Research And Manufacturing Corporation | Centrifugal blower with axial clearance |
| US4946348A (en) * | 1989-02-14 | 1990-08-07 | Airflow Research & Manufacturing Corporation | Centrifugal fan with airfoil vanes in annular volute envelope |
| CN102287864A (en) * | 2011-06-26 | 2011-12-21 | 唐益明 | Hot air heater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2759155B1 (en) * | 1997-02-05 | 1999-04-16 | Zh Ind | HEATING APPARATUS, IN PARTICULAR ELECTRIC CONVECTOR, INCLUDING A HOUSING MADE FROM A SINGLE SHEET |
-
1980
- 1980-08-02 DE DE19803029406 patent/DE3029406A1/en not_active Withdrawn
- 1980-11-03 CA CA000363857A patent/CA1157902A/en not_active Expired
-
1981
- 1981-03-23 ZA ZA00811908A patent/ZA811908B/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4917572A (en) * | 1988-05-23 | 1990-04-17 | Airflow Research And Manufacturing Corporation | Centrifugal blower with axial clearance |
| US4900228A (en) * | 1989-02-14 | 1990-02-13 | Airflow Research And Manufacturing Corporation | Centrifugal fan with variably cambered blades |
| US4946348A (en) * | 1989-02-14 | 1990-08-07 | Airflow Research & Manufacturing Corporation | Centrifugal fan with airfoil vanes in annular volute envelope |
| CN102287864A (en) * | 2011-06-26 | 2011-12-21 | 唐益明 | Hot air heater |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3029406A1 (en) | 1982-03-11 |
| ZA811908B (en) | 1982-04-28 |
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