GB2174279A - Electric heating device for fan - Google Patents
Electric heating device for fan Download PDFInfo
- Publication number
- GB2174279A GB2174279A GB08509609A GB8509607A GB2174279A GB 2174279 A GB2174279 A GB 2174279A GB 08509609 A GB08509609 A GB 08509609A GB 8509607 A GB8509607 A GB 8509607A GB 2174279 A GB2174279 A GB 2174279A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heating device
- strip
- heating member
- heating
- fan
- 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.)
- Withdrawn
Links
- 238000005485 electric heating Methods 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 126
- 239000012212 insulator Substances 0.000 claims abstract description 39
- 101100313377 Caenorhabditis elegans stip-1 gene Proteins 0.000 claims 1
- 101100313382 Dictyostelium discoideum stip-2 gene Proteins 0.000 claims 1
- 101100516335 Rattus norvegicus Necab1 gene Proteins 0.000 claims 1
- 101150059016 TFIP11 gene Proteins 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000012535 impurity Substances 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
Landscapes
- Resistance Heating (AREA)
Abstract
The present invention discloses an electric heating device (3) for a fan (1) which comprises a fixed frame (10) adapted to be mounted on the fan; a plurality of insulators (14) secured onto the fixed frame (10), each insulator (14) including a plurality of grooves (15) thereon; and a strip of heating member (17) adapted to be coupled to the electrical power source, wound on the insulators (14) by inserting it into the grooves (15) and arranging its two flat surfaces in parallel to the direction that the fan (1) delivers air. <IMAGE>
Description
SPECIFICATION
A heating device for a fan
The present invention is related to a heating device for a fan, and more particularly to an improved heating device which utilizes a strip of heating member wound on a special fixed frame.
The heating device which is first applied to the fan is a heating coil which winds around a frame via an insulator which is made of mica.
The frame is mounted behind or before the fan impeller, so that the heat energy generated from the heating coil can transfer to the air when the fan delivers a large volumes of air. However, such a heating device has the disadvantages of a smaller radiating area and slow radiating speed, usually resulting in that the heat energy can not be delivered to a sufficiently long distance with the air. Thus, for increasing the heating energy, the heating coil is commonly wound very close. In this case, when the indrawing air includes impurities, the impurities may be wedged in the gaps of the heating coil. If the impurities are combustible, they will burn easily and may cause other combustibles to burn. If the impurities are conductors they may cause the heating coil to short and then break due to the high temperature resulting from the short.
Since the heating coil has a slow radiating speed, the heat energy stored in the heating cojl is not radiated swiftly, and when the fan impeller is stopped, the plastic material of the fan impeller may be easily damaged. In addition, since the heating coil which is wound around the frame may cause several different wind densities, and since the different wind densities will induce the different resistances, the heating coil is often broken due to the high temperature.
The other type of heating device, which was developed to improve on the above-described disadvantages, includes a heating member interposed between a first insulator and a second insulator, and a stainless steel tube covering on the second insulator. Although this heating device has a higher radiating speed and a larger radiating area, the efficiency of heat radiating on the surface of the stainless steel tube is still low because the heat energy must be transmitted through the second insulator and the tube. Thus, if one wants to have sufficient heating, the length of the stainless steel tube must be made very long, and the stainless steel tube must be wound very closely. However, these techniques will impede the fan's circulation, exhaust or air delivery, resulating in an increase in the temperature of the fan, which is harmful to the fan itself.In addition, such a heating device is too expensive in manufacturing cost.
A heating device according to one preferred embodiment of the present invention intends to improve on the drawbacks described above.
One object of the present invention is to provide a heating device for a fan which utilizes a strip of heating member to provide a large radiating area, and a swift and uniform radiating speed.
Another object of the present invention is to provide a heating device which arranges the two flat surfaces of the strip of heating member in parallel to the direction that the fan delivers air, so that the impurities will not rest on the heating member.
Yet another object of the present invention is to provide a heating device which utilizes a special fixed frame to allow the heating member to easily and firmly mount thereon.
In accordance with the present invention, a heating device for a fan comprises a fixed frame adapted to be mounted on said fan; a plurality of insulators secured onto said fixed frame, each insulator including a plurality of grooves thereon; and a strip of heating member adapted to be coupled to the electrical power source, wound on said insulators by inserting into said grooves and placing its two flat surfaces parallel to the direction that said fan delivers air.
The present invention will be more fully understood from the following detailed description, taken in connection with the accompanying drawings which form an integral part of this application and in which:
Fig. 1 is a front elevational view of the heating device in accordance with the first embodiment of the present invention;
Fig. 2 is an enlarged view in section of the heating device taken along the line A-A in Fig.
1;
Fig. 3(a) is a side elevational view with a part in section, illustrating that the heating device is mounted on a fan and before the fan impeller;
Fig. 3(b) is a side elevational view with a part in section, illustrating that the heating device is mounted on a fan and behind the fan impeller;
Fig. 4 is an enlarged side view of a groove on the fixed frame, which illustrates the strip of heating member represented in section to be inserted into the groove;
Fig. 5 is an enlarged side view of the groove, illustrating that the heating member is accommodated in the groove;
Fig. 6 is an enlarged side view of a groove in one modified shape;
Fig. 7 is an enlarged side view of the groove of Fig. 6, and illustrates the strip of heating member to be inserted into the groove;;
Fig. 8 is an enlarged side view of the groove of Fig. 6, and illustrates the heating member to be accommodated in the groove;
Fig. 9 is an enlarged side view of a groove in another modified shape;
Fig. 10 is a perspective view showing part of the connective portion between two subframes of the fixed frame, on which the insulator is mounted, and a central connecting plate;
Fig. 11 is a perspective view illustrating the heating member inserted into the grooves of
Fig. 9 on the insulators;
Fig. 12 is an enlarged side view illustrating the heating member accommodated in several grooves which is in another modified shape, and a retaining plate secured on the subframe;
Fig. 13 is a front elevational view of the heating device in accordance with the second preferred embodiment of the present invention; and
Fig. 14 is a perspective view of the heating device in accordance with the third preferred embodiment of the present invention.
Referring now to the drawings, it should be noted that a like member is designated with a like reference number. In Figs. 1 to 3, a fan 1 consists of a fan impeller 2 for producing currents in order to circulate, exhaust or deliver large volumes of air or gas when the fan impeller 2 is rotating. A heating device 3 may be mounted before the fan impeller 2 as shown in Fig. 3(a) or behind the fan impeller 2 as shown in Fig. 3(b), and in the path that the air is delivered. The heating device 3 comprises a fixed frame 10, a plurality of insulators 14 secured onto the fixed frame 10, and a strip of heating member 17 wound on the insulators 14.The fixed frame 10 includes a central fastening plate 11, and a plurality of sub-frames 12, each of which has one end secured on the central fastening plate 11 and the other end radially extending away from the central fastening plate, and wherein the subframes 12 are separated by a fixed distance.
In the first embodiment, the central fastening plate 11 is a disk, as shown in Fig. 1, through which a central bore Ila and a plurality of openings 1 1b are provided for the driving shaft 4b of a motor 4 of the fan 1 to extend through and for several screws (not shown) to be screwed on the front casing 4a of the motor 4 through the openings 11 b in order to secure the fixed frame 10 on the fan 1 when heating device is fastened behind the fan impeller 2 as shown in Fig. 3(b). When the heating device 3 is fastened before the fan impeller 2 as shown in Fig. 3(a), the openings 1 1b and the central bore 11 a can also decrease the drag that impedes the delivery of air. Each sub-frame 12 is substantially formed as an elongated strip, and all have the same length.
The connective portion between each subframe 12 and the central fastening plate 11 is substantially formed as an enlarged triangular portion in order to reinforce this connection.
The insulators 14 are all made of mica in this embodiment, which is an electrical insulator and is capable of withstanding high temperature. Each insulator 14 is also formed as an elongated strip. Referring to Fig. 2, each insulator 14 is secured on the respective subframe 12 along its lower portion 1 4a by rivets, and has an upper portion 14b over the sub-frame 12. A plurality of grooves 15 are provided on the upper portion 1 4b of each insulator 14, and are separated by a distance.
Each groove 15 includes an inlet 15a, a chamber 15b which has an innermost surface 16a, and which is substantially in a trapezoid shape with an oblique plane 16b inclining from the innermost surface 1 6a to the inlet 1 5a for making the width of the groove 15 gradually reduce, and an enlarged view is shown in Fig.
4. It should be noted that the distance from the innermost surface 1 6a to the central fastening plate 11 is shorter than that from the inlet 15a to the central fastening plate 11.
The heating member strip 17 may be made of an alloy of nickel and chromium, and is formed as a thin strip. The heating member strip 17 is wound on the insulators 14 in a spiral shape by inserting it into the grooves 14, accommodating it in the chamber 15b, and making its two flat surfaces in parallel to the direction that the fan 1 delivers air. It should be noted that the spiral shape may start at a place near the central fastening plate 11 and extend to the free ends of the insulators 14, or start from the free ends of the insulators 14 and end at the place near the central fastening plate 11 in a clockwise or counterclockwise direction. Referring to Fig. 1, two ends of the heating member strip 17 are adapted to be coupled to the electrical power source through the lines 20 for converting the electrical energy into heat energy.A temperature/current controlling means 21 is connected between one line 20 and the strip of heating member 17 for shutting off the electrical power when the current flowing through the strip of heating member 17 is over a predetermined current value, and when the temperature around the heating device 3 is over a predetermined temperature value.
Referring to Figs. 4 and 5, there is shown an enlarged groove 15, and the steps to be followed for the insertion of heating member strip 17 to the groove 15 are illustrated. The heating member strip 17 is inserted in the chamber 15b via the inlet 15a which communicates with the chamber 1 sub, and is located on the innermost surface 16a of the chamber 15b. Since in this embodiment the heating member strip 17 is wound in a spiral, the tension will actuate the heating member strip 17 to stationarily rest on the innermost surface 16a. The oblique plane 16b of the chamber 15b further provides the function of preventing the strip of heating member 17 from sliding along the oblique plane 16b and away from the chamber 15b when the fan impeller 2 is rotating.
According to the structure of the heating device 3 described above, since the heating member 17 is a thin strip, and since its two flat surfaces are arranged in parallel to the direction that the fan 1 delivers air, the heating member 17 has a large radiating area and a swift radiating speed. Therefore, when the fan is turned on, the heat transferring efficiency of the heating device 3 to the air is sufficiently high, and when the fan is turned off, the heating device 3 can also swiftly cool.
In addition, the impurities involved in the indrawing air of the fan 1 are cannot rest as easily on the strip of heating member 17.
In Figs. 6 to 8, there is shown a groove 15' modified in shape according to another preferred embodiment. The groove 15' also has an inlet 15a' which is substantially in a trapezoid shape, and a chamber 15b' which communicates with the inlet 15a', and which is substantially formed in a rectangular shape.
The strip of heating member 17 is inserted into the chamber 15b' via the inlet 15a' along the oblique plane 16b' of the inlet 15a', and is then located on the innermost surface 16a' of the chamber by way of the same manner described above. It should be noted that the width of the communicative junction between the inlet 15a' and the chamber 15b' is smaller than that of the strip of heating member 17, so that the strip of heating member 17 will not slide away from the groove 15'.
Referring to Figs. 9 to 11, there is shown a groove 15" modified in shape according to yet another preferred embodiment. The groove 15" is in an arched shape, and its depth is larger than the width of the strip of heating member 17. In this embodiment the grooves 15" on the adjoining insulators 14" which is secured on the sub-frames 12 by rivets are respectively arched in opposite directions as shown in Fig. 10. The strip of heating member 17 is then wound in a wave shape, as shown in Fig. 11, for each groove 15" to more powerfully retain the heating member 17 therein.
Referring to Fig. 12, the grooves 15 may also be formed in a rectangular shape, and their depth is greater than the width of the strip of heating member 17. A plurality of retaining plates 150 are respectively mounted on the upper portion of the insulators 14 for keeping the strip of heating member 17 stationarily in the grooves 15, when the strip of heating member 17 has been inserted in the grooves 15.
The structure of the heating device according to the second preferred embodiment of the present invention as shown in Fig. 13 is the same with the structure as shown in Fig.
1. The only difference is that the heating device in Fig. 13 is formed in a rectangular shape for being mounted on the fan which is also substantially in a rectangular shape.
Referring to Fig. 14, there is shown a fixed frame 10' according to the third preferred embodiment of the present invention. The fixed frame 10' consists of two fixed plates 10a and 10b on which a plurality of slots 100a and 100b are respectively provided. The slots 100a and 100b are separated by a proper distance. A plurality of insulators 140, each of which has a plurality of grooves 50 respectively on its two sides, are respectively secured between the two fixed plates 1 0a and 10b by inserting their two ends into the slots 100a and 100b.It should be noted that in this embodiment the grooves 50 can also be formed in any one of the shapes described above. in this case, the strip of heating member 17 may be wound on the grooves 50 of the insulators 140 by first inserting it in every groove 50 of the same height, and then bending it to insert it into the adjoining upper or lower grooves 50. The strip of heating member 17 may also be wound in the wave pattern as shown in Fig. 14. The heating device 3 with this structure is advantageously suitable for the fan provided in an air conditioner to exhaust the warm air.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims which scope is to be accorded the broadest interpretation so as to encompass all such modification and equivalent structures.
Claims (22)
1. A heating device for a fan comprising:
a fixed frame adapted to be mounted on the fan;
a plurality of insulators secured onto the fixed frame, each insulator including a plurality of grooves thereon; and
a strip of heating member adapted to be coupled to the electrical power source, wound on the insulators by inserting it into the grooves and arranging its two flat surfaces in parallel to the direction that the fan delivers air.
2. A heating device as claimed in claim 1, wherein the fixed frame comprises a central fastening plate, and a plurality of sub-frames each of which has one end secured on the central fastening plate and the other end radiaily extending away from the central fastening plate.
3. A heating device as claimed in claim 2, wherein the central fastening plate has a plurality of openings therethrough for decreasing the drag that impedes the delivery of air.
4. A heating device as claimed in claim 1, 2, or 3, wherein the strip of heating member is wound on the insulators in a spiral shape.
5. A heating device as claimed in claim 2, 3, or 4, wherein each connective portion between each sub-frame and the central fastening plate is substantially formed as an enlarged triangular portion in order to reinforce the connection.
6. A heating device as claimed in any of claims 2 to 5, wherein the central fastening plate has a central bore therethrough for the driving shaft of the fan to extend through when the heating device is secured behind the fan impeller.
7. A heating device as claimed in any preceding claim, wherein the heating device further comprises a temperature/current controlling means connected between the strip of heating member and the electrical power for shutting off the electrical power when the current flowing through the strip of heating member is over a predetermined current value, and when the temperature around the heating device is over a predetermined temperature value.
8. A heating device as claimed in claim 7, wherein the temperature/current controlling means includes a bimetallic element and a fuse connected in series to the bimetallic element.
9. A heating device as claimed in any of claims 2 to 8, wherein each groove of each insulator includes an inlet for the strip of heating member to insert into, and a chamber communicating with the inlet for accommodating the strip of heating member on its innermost surface.
10. A heating device as claimed in claim 9, wherein the distance between the innermost surface of each groove and the fastening plate is shorter than that between the inlet and the fastening plate.
11. A heating device as claimed in claim 9 or 10, wherein the chamber is in a trapezoid shape, and has an oblique plane inclining from the innermost surface to the inlet in order to make the width of the groove gradually reduce for preventing the strip of heating member from sliding along the oblique plane when the fan impeller is rotating.
12. A heating device as claimed in any of claims 1 to 8, wherein each groove is in an arched shape, and the grooves on the adjoining insulator are respectively arched in opposite directions, and wherein the strip of heating member is wound in a wave shape.
13. A heating device as claimed in any of claims 1 to 8, wherein each groove is in a rectangular shape, and the heating device further comprises a plurality of retaining plates mounted on the upper portion of the insulators for keeping the strip of heating member stationarily in the grooves, when the strip of heating member has been inserted in the grooves.
14. A heating device as claimed in claim 1, wherein the fixed frame is formed as two fixed plates, and the insulators are respectively secured between the fixed plates and separated with a predetermined distance.
15. A heating device as claimed in claim 14, wherein the grooves on each insulator are provided on two sides of the insulator.
16. A heating device as claimed in claim 14, or 15, wherein the heating device further comprises a temperature/current controlling means connected between the strip of heating member and the electrical power source for shutting off the electrical power when the current flowing through the strip of heating member is over a predetermined current value, and when the temperature around the heating device is over a predetermined temperature value.
17. A heating device as claimed in claim 16, wherein the temperature/current controlling means includes a bimetallic element and a fuse connected in series to the bimetallic element.
18. A heating device as claimed in any of claims 14 to 17, wherein each groove of each insulator includes an inlet for the strip of heating member to insert into, and a chamber communicating with the inlet for accommodating the strip of heating member on its innermost surface.
19. A heating device as claimed in claim 18, wherein the chamber is in a trapezoid shape, and has an oblique plane inclining from the innermost surface to the inlet in order to making the width of the groove gradually reduce for preventing the strip of heating member from sliding along the oblique plane when the fan is rotating.
20. A heating device as claimed in any of claims 14 to 17, wherein each groove is in an arched shape, and the grooves on the adjoining insulator are respectively arched in opposite directions.
21. A heating device as claimed in any of claims 14 to 17, wherein each groove is in a rectangular shape, and the heating device further comprises a plurality of retaining plates mounted on the insulators for keeping the strip of heating member stationarily in the grooves, when the stip of heating member is inserted in the grooves.
22. A heating device substantially as hereinbefore described with reference to Figures 1 to 14 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08509609A GB2174279A (en) | 1985-04-15 | 1985-04-15 | Electric heating device for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08509609A GB2174279A (en) | 1985-04-15 | 1985-04-15 | Electric heating device for fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8509607D0 GB8509607D0 (en) | 1985-05-22 |
| GB2174279A true GB2174279A (en) | 1986-10-29 |
Family
ID=10577661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08509609A Withdrawn GB2174279A (en) | 1985-04-15 | 1985-04-15 | Electric heating device for fan |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2174279A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5414794A (en) * | 1993-10-26 | 1995-05-09 | Shao; Steve | Quickly-mountable securing structure for electric heating element in a heater fan |
| US6397002B1 (en) * | 2000-11-28 | 2002-05-28 | King Of Fans, Inc. | Combination fan and heater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109480447B (en) * | 2019-01-04 | 2024-04-02 | 深圳市奋达科技股份有限公司 | Air duct heating frame and assembling method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB650512A (en) * | 1948-07-24 | 1951-02-28 | Simplex Electric Co Ltd | Improvements in electrical heating apparatus |
| GB685500A (en) * | 1951-02-23 | 1953-01-07 | James Arthur Reavell | Improvements in or relating to coiled electrical heating elements |
| GB951141A (en) * | 1960-03-05 | 1964-03-04 | Karl Hartmeyer | Electric heaters for gaseous media |
| GB993317A (en) * | 1960-09-08 | 1965-05-26 | Firth Cleveland Ltd | Improvements relating to electric heater elements |
-
1985
- 1985-04-15 GB GB08509609A patent/GB2174279A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB650512A (en) * | 1948-07-24 | 1951-02-28 | Simplex Electric Co Ltd | Improvements in electrical heating apparatus |
| GB685500A (en) * | 1951-02-23 | 1953-01-07 | James Arthur Reavell | Improvements in or relating to coiled electrical heating elements |
| GB951141A (en) * | 1960-03-05 | 1964-03-04 | Karl Hartmeyer | Electric heaters for gaseous media |
| GB993317A (en) * | 1960-09-08 | 1965-05-26 | Firth Cleveland Ltd | Improvements relating to electric heater elements |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5414794A (en) * | 1993-10-26 | 1995-05-09 | Shao; Steve | Quickly-mountable securing structure for electric heating element in a heater fan |
| US6397002B1 (en) * | 2000-11-28 | 2002-05-28 | King Of Fans, Inc. | Combination fan and heater |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8509607D0 (en) | 1985-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |