CN1089142C - Axial flow fan for microwave oven - Google Patents
Axial flow fan for microwave oven Download PDFInfo
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- CN1089142C CN1089142C CN 96100882 CN96100882A CN1089142C CN 1089142 C CN1089142 C CN 1089142C CN 96100882 CN96100882 CN 96100882 CN 96100882 A CN96100882 A CN 96100882A CN 1089142 C CN1089142 C CN 1089142C
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
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Abstract
An axial flow fan for a microwave oven capable of more effectively cooling a magnetron and a high voltage transformer of the same and more effectively circulating air in the interior of the same, so that an improved microwave oven having a higher efficiency and a lower noise can be achieved, includes five blades spaced-apart at a regular interval and formed at the outer circumferential surface of a cylindrical hub. The blades 52 have a ratio ''fan hub diameter/fan outer diameter'' in the range of 0.28 0.35.
Description
The present invention relates to microwave oven axial fan (axial flow fan), it more specifically is an improved microwave oven axial fan, it is magnetron and the high-tension transformer (high voltage transformer) in the cooled microwave stove more effectively, more effectively therefore the air-flow in the circulation microwave stove can improve the efficient of microwave oven and reduce noise.
Fig. 1 has shown conventional microwave oven, and it comprises a cooking cavity (cooking chamber) 2 in body of heater 1, is used to hold the food of being cooked.Rotating disk (turntable) 3 places the bottom of cooking cavity 2.Fire door 4 is hinged on the body of heater 1.
In addition, as shown in Figure 2, magnetron 5 and high-tension transformer 6 are positioned at body of heater 1 inside.
The side that conduit (duct) 7 is positioned at magnetron 5 is used for microwave guiding 2, one internal vent ports of cooking cavity (inner air discharging port) 8 that magnetron 5 produces are positioned at the one side of magnetron.
In addition, axial fan 9 is positioned at the back of magnetron 5 and high-tension transformer 6, and links to each other with fan electromotor (fan motor) 10.
In addition, suction port (air suction port) 12 opens the back side at microwave oven after axial fan 9.
In addition, air inlet guiding device (suction guide) 11 is positioned at the front of axial fan 9, being used for air-flow guiding magnetron 5 and 6, one outside relief openings of high-tension transformer (external air discharging port) 13 that the commentaries on classics power of executing with axial fan 9 produced is positioned on the precalculated position on the low surface of microwave oven.
Now in conjunction with the accompanying drawings, the operation to microwave oven that an axial fan is housed describes.
When conventional microwave oven was switched on, the rotating disk 3 in the cooking cavity 2 began rotation, and magnetron 5 and high-tension transformer 6 are started working simultaneously, and magnetron 5 produces microwaves.
Microwave is directed to and places the food that will cook on the rotating disk 3, and rotating disk 3 rotates in cooking cavity.
At this moment, high-tension transformer will provide the high pressure of 4000V for magnetron 5.
So magnetron 5 and high-tension transformer 6 will produce a large amount of heat.In order to prevent that other parts are heated, and must reduce the temperature of magnetron 5 and high-tension transformer 6.
So axial fan 9 is activated in order to the air in the external world is sent into cooking cavity by suction port 12.
Inhaled air is used to cool off magnetron 5 and high-tension transformer 6 by air inlet guiding device 1 guiding magnetron 5 and high-tension transformer 6, and the smell of food is discharged.
Shown in Fig. 3 and 4, common axial fan 9 comprises the blade that is positioned at four separation on cylinder type wheel hub (hub) 21 peripheries.
An axle positioning port (axis fixing port) 23 is positioned at the middle part of wheel hub 21.
In addition, (leading edge) is 0 when leading edge, and trailing edge (trailing edge) is 1 o'clock, and maximum camber position (maximum camber position) is 0.5, and maximum camber position is divided equally by the cross section of (tip) 22c from wheel hub 21 to blade tip.
In addition, plunder angle (sweep angle) θ less than 10.
Among the figure, G represents the width of wheel hub 21, and H represents the length of wheel hub 21, and I represents the length of fan front portion, and J represents the length at fan rear portion.
In addition, Fig. 5 A shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the air flow condition that records.Fig. 5 B shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the air flow condition that records.Fig. 5 C shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the air flow condition that records.Fig. 5 D shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the air flow condition that records.Fig. 6 A shown 0 in the scope of 20Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the air flow condition that records.Fig. 6 B shown 0 in the scope of 20Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the air flow condition that records.Fig. 6 C shown 0 in the scope of 20Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the air flow condition that records.Fig. 6 D shown 0 in the scope of 20Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the air flow condition that records.Fig. 7 A shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the culinary art noise state that records.Fig. 7 B shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the culinary art noise state that records.Fig. 7 C shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the culinary art noise state that records.Fig. 7 D shown 0 in the scope of 2Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the culinary art noise state that records.
Yet,, plunder angle θ less than 10 ° because the maximum camber (maximumcamber) of the axial fan of conventional microwave oven is 0.5, when cooling blast forms, the flow direction of cooling air is axial, so corresponding devices can not effectively be cooled off as magnetron and high-tension transformer.
In addition because the rotating speed of conventional axial fan be 3020RPM (rev/min), so shown in Fig. 5-7, the noise level that can hear increases.
Therefore to be intended to be to propose a kind of microwave oven axial fan to target of the present invention, and it can overcome conventional microwave oven with problem that fan ran into.
Another object of the present invention is intended to propose a kind of improved microwave oven axial fan, it is magnetron and the high-tension transformer in the cooled microwave stove more effectively, more effectively therefore the air-flow in the circulation microwave stove can improve the efficient of microwave oven and reduce noise.
For achieving the above object, according to an aspect of the present invention, microwave oven comprises the equidistant blade that separates of five on the outer cylinder that takes shape in a cylinder type wheel hub with axial fan; " the fan hub diameter/fan external diameter " of blade is than being 0.28～0.35.The fan external diameter is 108 ± 1mm, and described hub diameter is 35.6 ± 1mm.
For achieving the above object, according to a further aspect in the invention, microwave oven comprises the equidistant blade that separates of five on the outer cylinder that takes shape in a cylinder type wheel hub with axial fan; " the fan hub diameter/fan external diameter " of blade is than being 0.28～0.3.The fan external diameter is 108 ± 1mm, and described hub diameter is 30.2 ± 1mm.
Fig. 1: the perspective view of conventional microwave oven.
Fig. 2 a: sectional view that shows the mobile path of cooling air in the microwave oven that conventional axial fan is housed.
Fig. 3: the conventional microwave oven front elevation of axial fan.
The enlarged view of Fig. 4: Fig. 3.
Fig. 5 A: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the air flow condition that records (air flowing state).
Fig. 5 B: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the air flow condition that records.
Fig. 5 C: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the air flow condition that records.
Fig. 5 D: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the air flow condition that records.
Fig. 6 A: 0 in the scope of 20Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the air flow condition that records.
Fig. 6 B: 0 in the scope of 20Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the air flow condition that records.
Fig. 6 C: 0 in the scope of 20Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the air flow condition that records.
Fig. 6 D: 0 in the scope of 20Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the air flow condition that records.
Fig. 7 A: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " A " of Fig. 1 to the culinary art noise state that records (cooking noise state).
Fig. 7 B: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " B " of Fig. 1 to the culinary art noise state that records.
Fig. 7 C: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " C " of Fig. 1 to the culinary art noise state that records.
Fig. 7 D: 0 in the scope of 2Khz, during rotating speed 3020RPM, in " D " of Fig. 1 to the culinary art noise state that records.
Fig. 8: according to the front elevation of microwave oven in the first embodiment of the present invention with axial fan.
Fig. 9: according to the enlarged view of Fig. 8 of the present invention.
Figure 10: demonstration is according to the X-Z planimetric map of Fig. 9 of the maximum camber of the axial fan of the first embodiment of the present invention.
Figure 11: demonstration is according to the X-Z planimetric map of the Fig. 9 at the tilt angle of the axial fan of the first embodiment of the present invention.
Figure 12: demonstration is according to the noise test of the axial fan of the first embodiment of the present invention and the contrast table of prior art.
Figure 13: the schematic representation that carries out the noise test of Figure 12 according to the present invention.
Figure 14 A: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 3020RPM, at " A " of Fig. 1 to recording.
Figure 14 B: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 3020RPM, at " B " of Fig. 1 to recording.
Figure 14 C: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 3020RPM, at " C " of Fig. 1 to recording.
Figure 14 D: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 3020RPM, at " D " of Fig. 1 to recording.
Figure 15 A: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2400RPM, at " A " of Fig. 1 to recording.
Figure 15 B: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2400RPM, at " B " of Fig. 1 to recording.
Figure 15 C: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2400RPM, at " C " of Fig. 1 to recording.
Figure 15 D: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2400RPM, at " D " of Fig. 1 to recording.
Figure 16 A: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2350RPM, at " A " of Fig. 1 to recording.
Figure 16 B: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2350RPM, at " B " of Fig. 1 to recording.
Figure 16 C: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2350RPM, at " C " of Fig. 1 to recording.
Figure 16 D: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2350RPM, at " D " of Fig. 1 to recording.
Figure 17 A: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2145RPM, at " A " of Fig. 1 to recording.
Figure 17 B: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2145RPM, at " B " of Fig. 1 to recording.
Figure 17 C: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2145RPM, at " C " of Fig. 1 to recording.
Figure 17 D: the culinary art noise figure according to the microwave oven of the axial fan of the first embodiment of the present invention is housed, this figure when rotating speed 2145RPM, at " D " of Fig. 1 to recording.
Figure 18: according to the fan data boundary table of the axial fan of the first embodiment of the present invention.
Figure 19: the front elevation of using the axial fan blade according to microwave oven according to the present invention.
Figure 20 A: the planimetric map of axial fan according to a second embodiment of the present invention.
Figure 20 B: the profile of axial fan according to a second embodiment of the present invention.
Figure 21 A: the propeller-blade section figure that shows the maximum camber of axial fan according to a second embodiment of the present invention.
Figure 21 B: the propeller-blade section figure that shows the tilt angle of axial fan according to a second embodiment of the present invention.
Figure 22 A: in the scope of 0-2, during rotating speed 2460RPM, in Fig. 1 " A " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 22 B: in the scope of 0-2, during rotating speed 2460RPM, in Fig. 1 " B " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 22 C: in the scope of 0-2, during rotating speed 2460RPM, in Fig. 1 " C " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 22 D: in the scope of 0-2, during rotating speed 2460RPM, in Fig. 1 " D " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 23 A: in the scope of 0-20, during rotating speed 2460RPM, in Fig. 1 " A " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 23 B: in the scope of 0-20, during rotating speed 2460RPM, in Fig. 1 " B " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 23 C: in the scope of 0-20, during rotating speed 2460RPM, in Fig. 1 " C " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 23 D: in the scope of 0-20, during rotating speed 2460RPM, in Fig. 1 " D " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 24 A: in the scope of 0-2, during rotating speed 3020RPM, in Fig. 1 " A " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 24 B: in the scope of 0-2, during rotating speed 3020RPM, in Fig. 1 " B " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 24 C: in the scope of 0-2, during rotating speed 3020RPM, in Fig. 1 " C " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 24 D: in the scope of 0-2, during rotating speed 3020RPM, in Fig. 1 " D " culinary art noise figure to the microwave oven according to a second embodiment of the present invention that records.
Figure 25: the fan data boundary table of axial fan according to a second embodiment of the present invention.
Figure 26: according to the front elevation of the blade among Figure 25 of the present invention.
Fig. 8 has shown the microwave oven axial fan according to the first embodiment of the present invention, and it comprises five equidistant blades 52 that separate that take shape on cylinder type wheel hub 51 cylinders.
The ratio of the fan hub diameter B/ fan outer diameter A of blade 52 is 0.28-0.35.
In addition, as shown in Figure 9, the anterior length I of the fan from fan center " 0,0,0 " to maximum leading edge 52a is 15.14 ± 0.5mm along running shaft (Z axle).
In addition, the fan rear portion length J from fan center " 0,0,0 " to maximum trailing edge 52b is 15.14 ± 0.5mm along running shaft (Z axle).
In addition, the ratio of the fan hub diameter B/ fan outer diameter A of blade 52 is preferably 0.33.
The fan outer diameter A is 108 ± 1mm, and fan hub diameter B is 35.6 ± 1mm.
The angle θ of plunderring from the wheel hub to the blade tip is (0～25 °) ± 1 °, and as shown in figure 11, tilt angle is (43.99 °～30.99 °) ± 1 °.
As shown in figure 10, maximum camber position L is 0.45～0.5, is even distribution (even distribution) from wheel hub 51 to blade tip F.
Herein, the maximum radian from wheel hub 51 to blade tip 52c (maximum camberratio) is (5.01～11.01%) ± 0.05% than " (maximum camber M/ code length) * 100 ".
In addition, be " Tt=0.75Th " (Th represents maximum ga(u)ge) at the thickness of blade tip 52c place blade 52, between leading edge 52a and trailing edge 52b, thickness distribution is bielliptic(al) curve (duplicated elliptical curbed line).
As shown in Figure 8, the distance between the blade 52 " a～b～c～d " is " 6.2～10.4～8.0～21.6 "
That is to say that when wheel hub is 0, blade tip is at 1 o'clock, the distance between two blades is 6.2 ± 0.5mm at wheel hub 51 places; In interval 0～0.75 is 6.2 ± 0.5mm to 10.4 ± 0.5mm; In interval 0.75～0.95 is 10.4 ± 0.5mm; In interval 0.95～1 is 8.0 ± 0.5mm to 21.6 ± 0.5mm.
In order to test noise reduction effect according to the axial fan of said structure of the present invention, cooling effect to conventional axial fan under the 3020RPM and the axial fan of the present invention under the 2400RPM compares, simultaneously the conventional axial fan of 2350RPM and the cooling effect of the axial fan of the present invention under the 2145RPM are compared, the results are shown in Figure 12.
As shown in figure 12, the average noise value that is used for the conventional axial fan (3020RPM) of conventional microwave oven is 46.06db (A), and uses the average noise value of axial fan of the present invention (2400RPM) to be 41.88db (A).In addition, the average noise value that is used for the conventional axial fan (2350RPM) of microwave oven of the present invention is 43.24db (A), and uses the average noise value of axial fan of the present invention (2145RPM) to be 39.47db (A).Therefore, compared with the prior art, axial fan of the present invention reduces noise 3.8%.
Figure 13 has shown the schematic representation that carries out the test of Figure 12 according to the present invention.Among Figure 13, label 71 is represented magnetron, and 72 represent control unit, and 73 represent vent locations, 75 represent the cooling segment of magnetron HVT, and 76 represent the MWO fan, and 77 represent suction port, and 78 represent cooking cavity, 79 represent the suction port of cooking cavity, and 79a represents relief opening, and 80 represent the fire door of cooking cavity.
In addition, Figure 14 A has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 3020RPM, at " A " of Fig. 1 to recording; Figure 14 B has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 3020RPM, at " B " of Fig. 1 to recording; Figure 14 C has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 3020RPM, at " C " of Fig. 1 to recording; Figure 14 D has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 3020RPM, at " D " of Fig. 1 to recording; Figure 15 A has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2400RPM, at " A " of Fig. 1 to recording; Figure 15 B has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2400RPM, at " B " of Fig. 1 to recording; Figure 15 C has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2400RPM, at " C " of Fig. 1 to recording; Figure 15 D has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2400RPM, at " D " of Fig. 1 to recording; Figure 16 A has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2350RPM, at " A " of Fig. 1 to recording; Figure 16 B has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2350RPM, at " B " of Fig. 1 to recording; Figure 16 C has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure is under 2350RPM, at " C " of Fig. 1 to recording, Figure 16 D has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2350RPM, at " D " of Fig. 1 to recording; Figure 17 A has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2145RPM, at " A " of Fig. 1 to recording; Figure 17 B has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2145RPM, at " B " of Fig. 1 to recording; Figure 17 C has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2145RPM, at " C " of Fig. 1 to recording; Figure 17 D has shown the culinary art noise that is equipped with according to the microwave oven of the axial fan of the first embodiment of the present invention, this figure under 2145RPM, at " D " of Fig. 1 to recording.
In addition, Figure 18 has shown the fan data boundary according to the axial fan of the first embodiment of the present invention, and Figure 19 has shown the blade of microwave oven according to the present invention with axial fan.
Among Figure 19, label 1,41,81,121 and 161 represent the point of system of coordinates.
In addition, Figure 20 A and 20B have shown axial fan according to a second embodiment of the present invention, and it comprises a wheel hub 62 and five blades 64 that take shape on wheel hub 62 cylinders with the rotating handle (not shown) that is inserted into axial fan 60 middle parts.
The ratio of the hub diameter DH of axial fan 60 according to a second embodiment of the present invention and fan outer diameter D T is 0.28～0.3.
At this moment, fan outer diameter D T is preferably 108 ± 1mm, and fan hub diameter DH is preferably 30.2 ± 1mm.
In addition, shown in Figure 21 B, 63 tiltangle P is (41.96 °～28.96 °) from wheel hub 62 to blade tip.63 the angle θ S of plunderring is (0 °～30 °) ± 2 ° from wheel hub 62 to blade tip, is that the Linear Parabolic line distributes.
Shown in Figure 21 A, 63 maximum camber position CMP evenly distributes from wheel hub 62 to blade tip, is " 0.6-0.65 ".63 the maximum camber ratio from wheel hub 62 to blade tip (maximum camber/code length (CL) * 100) is " (3.46-9.46) ± 0.05% ", is linear.
Shown in Figure 21 B, " 0 " distance of (Z axle) is front distance VL to maximum leading edge 64a along running shaft from the center, and shown in Figure 20 B, " 0 " distance of (Z axle) is rear portion distance R L to maximum trailing edge 64b along running shaft from the center.
In this embodiment, front distance VL is 19.42 ± 0.5mm, and rear portion distance R L is 11.53 ± 0.5mm.
If the maximum ga(u)ge of blade 64 is " Th ", the thickness at blade blade tip place is " 0.75Th ".In addition, the blade thickness between wheel hub 62 and the blade tip 63 is a linear change, and the blade thickness between leading edge 64a and the trailing edge 64b is distributed as the bielliptic(al) curve.
When the interval CB between the blade 64 increases, be " 0 " wherein with wheel hub 62, be " 1 " with the position of blade tip 63, the interval CB between wheel hub 62 and the blade 64 is 6.7 ± 0.5mm; In interval 0～0.75 is 6.7 ± 0.5mm to 11.2 ± 0.5mm; In interval 0.75～0.95 is 11.2 ± 0.5mm to 9.0 ± 0.5mm; In interval 0.95～1 is 9.0 ± 0.5mm to 23.0 ± 0.5mm.
Among the figure, HL represents hub length, and HW represents the width of blade wheel hub.
By Figure 22-24, can understand performance according to a second embodiment of the present invention better.
Figure 22 A has shown in the scope of 0-2, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " A " to the microwave oven according to a second embodiment of the present invention that records; Figure 22 B has shown in the scope of 0-2, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " B " to the microwave oven according to a second embodiment of the present invention that records; Figure 22 C has shown in the scope of 0-2, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " C " to the microwave oven according to a second embodiment of the present invention that records; Figure 22 D has shown in the scope of 0-2, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " D " to the microwave oven according to a second embodiment of the present invention that records; Figure 23 A has shown in the scope of 0-20, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " A " to the microwave oven according to a second embodiment of the present invention that records; Figure 23 B has shown in the scope of 0-20, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " B " to the microwave oven according to a second embodiment of the present invention that records; Figure 23 C has shown in the scope of 0-20, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " C " to the microwave oven according to a second embodiment of the present invention that records; Figure 23 D has shown in the scope of 0-20, during rotating speed 2460RPM, in the culinary art noise of Fig. 1 " D " to the microwave oven according to a second embodiment of the present invention that records; Figure 24 A has shown in the scope of 0-2, during rotating speed 3020RPM, in the culinary art noise of Fig. 1 " A " to the microwave oven according to a second embodiment of the present invention that records; Figure 24 B has shown in the scope of 0-2, during rotating speed 3020RPM, in the culinary art noise of Fig. 1 " B " to the microwave oven according to a second embodiment of the present invention that records; Figure 24 C has shown in the scope of 0-2, during rotating speed 3020RPM, in the culinary art noise of Fig. 1 " C " to the microwave oven according to a second embodiment of the present invention that records; Figure 24 D has shown in the scope of 0-2, during rotating speed 3020RPM, in the culinary art noise of Fig. 1 " D " to the microwave oven according to a second embodiment of the present invention that records.
Shown in Figure 22-24, compare with conventional fan, the present invention has reduced discrete noise, and wide band noise reduces.
In addition, when culinary art, discrete noise increases.That is to say that microwave oven usefulness axial fan reduces the noise of 4.8db (A) when air flows, when culinary art, reduce the noise of 4.8db (A).
In addition according to a second embodiment of the present invention microwave oven has been carried out the test that heats up.
The container that a splendid attire 2000ml water is arranged in the cooking cavity, test has been carried out two hours.Under this state, the temperature of heat-generating units does not change, and detects limiting temperature.
With differential recorder HR2500E (Yokogaya) and K type thermocouple the temperature of the upper surface of the anode of magnetron and high-tension transformer is measured.
Measurement result is as shown in the table:
Microwave oven heats up and tests (Table I)
Table I
| Fan type | Tested position | The fan revolution | T(℃) |
| Conventional fan | Magnetron | 3020 | 148.2 |
| HVT | 96.8 | ||
| Fan of the present invention | Magnetron | 2460 | 147.4 |
| HVT | 100.4 |
HVT represents high-tension transformer in the last table.
As above shown in the table, also may reach conventional temperature with lower rotating speed.
In addition, also tested the noise of microwave oven.
When the noise test of cooking status, be placed with the container that splendid attire 1500ml water in the cooking cavity, heated 30 minutes, in aforesaid operations, noise has reduced.When the air flows noise is tested, has only fan in operation.Test result is as shown in the table.
Noise of microwave oven test (Table II)
Table II
| FT | NR | TS | Noise level | AV | |||
| A | B | C | D | ||||
| FA | 3020 | Flow | 42.13 | 45.74 | 44.99 | 51.36 | 46.06 |
| Culinary art | 42.21 | 45.31 | 44.71 | 50.96 | 45.80 | ||
| FP | 2460 | Flow | 36.80 | 40.75 | 38.88 | 44.75 | 40.30 |
| Culinary art | 37.67 | 40.80 | 40.24 | 45.16 | 40.97 | ||
In last table, Ft represents fan type, and Nr represents rotation speed of the fan, and AV represents mean value, and FA represents the fan of prior art, and FP represents fan of the present invention.In addition, A, B, C, D represent the direction among Figure 13.
As shown in Table II, compare with the fan of prior art, fan of the present invention has reduced noise.
Figure 25 has shown the data boundary of axial fan according to a second embodiment of the present invention, and Figure 26 has shown the blade according to Figure 25 of the present invention.
As mentioned above, microwave oven according to the present invention passes through to change the number of blade with axial fan, improve and plunder the angle, the tilt angle, the distance of maximum camber and maximum camber position and blade, the more effectively magnetron of cooled microwave stove and high-tension transformer, the air of more effective circulation microwave furnace interior, therefore improve the efficient of microwave oven, reduced noise.
Though optimum implementation of the present invention announces for explanation, only otherwise depart from disclosed scope and spirit of the present invention in the claim statement, the modification of technical maturing part, increase and substituting also is fine.
Claims (1)
1. microwave oven axial fan comprises:
The multi-disc blade equidistantly distributes and takes shape on the outer cylinder of a cylindrical bosses; The ratio of " the fan hub diameter/fan integral diameter " of above-mentioned blade is 0.28～0.35, and the external diameter of fan is 108 ± 1mm, and the fan hub diameter is 35.6 ± 1mm,
It is characterized in that the quantity of blade is 5, the sweepback angle is 0～25 ° from the wheel hub of blade to blade tip, this coverage bias ± 1 °,
Pitching angle is 43.99 °～30.99 ° from the wheel hub of blade to blade tip, this coverage bias ± 1 °,
Maximum camber position is formed in 0.45～0.5 the scope, and maximum camber is than in 5.01～11.01% scope, this coverage bias ± 0.05%,
The thickness of above-mentioned blade is Tt=0.75Th, and wherein Tt represents the thickness of blade, and Th represents the maximum ga(u)ge of wheel hub, and the thickness distribution between leading edge and the trailing edge is the resultant curve of satisfied two different elliptic equations,
If with wheel hub is 0 point, is 1 point with blade, then the distance between blade and the adjacent blades in segmentation blade part office is: at 0 is wheel hub, is 6.2 ± 0.5mm; In interval 0～0.75, increase to 10.4 ± 0.5mm from 6.2 ± 0.5mm; In interval 0.75～0.95, be reduced to 8.0 ± 0.5mm from 10.4 ± 0.5mm; Interval 0.95～1 is the blade tip place, sharply increase to 21.6 ± 0.5mm from 8.0 ± 0.5mm, and form by parabola at boundary point 0.75 and 0.95 place,
(I VL) is 15.14 ± 0.5mm to the anterior length of above-mentioned axial fan, and (J RL) is 15.14 ± 0.5mm to rear portion length.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR15608/1995 | 1995-06-13 | ||
| KR1019950015608A KR970005256B1 (en) | 1995-06-13 | 1995-06-13 | Microwave ovenrange axial fan |
| KR28579/1995 | 1995-09-01 | ||
| KR1019950028579A KR0139690B1 (en) | 1995-09-01 | 1995-09-01 | Axial flow fan for microwave |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1143730A CN1143730A (en) | 1997-02-26 |
| CN1089142C true CN1089142C (en) | 2002-08-14 |
Family
ID=26631074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96100882 Expired - Fee Related CN1089142C (en) | 1995-06-13 | 1996-01-19 | Axial flow fan for microwave oven |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1089142C (en) |
| GB (1) | GB2302141B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6565320B1 (en) | 2000-11-13 | 2003-05-20 | Borgwarner, Inc. | Molded cooling fan |
| GB2372785B (en) * | 2001-01-11 | 2004-05-05 | Lg Electronics Inc | Fan for condenser of refrigerator |
| TR200301280T1 (en) | 2001-03-15 | 2005-09-21 | Arçeli̇k Anoni̇m Şi̇rketi̇ | Fan |
| US6911636B2 (en) * | 2002-01-03 | 2005-06-28 | Lg Electronics Inc. | Cooling fan for microwave oven |
| JP4943817B2 (en) * | 2006-10-31 | 2012-05-30 | 日本電産サーボ株式会社 | Axial fan |
| WO2019035153A1 (en) * | 2017-08-14 | 2019-02-21 | 三菱電機株式会社 | Impeller, fan, and air conditioning device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364712A (en) * | 1980-07-10 | 1982-12-21 | Canadian Fram | Cross flow cooling fan |
| DE3220574A1 (en) * | 1982-06-01 | 1983-12-01 | Siemens AG, 1000 Berlin und 8000 München | STEEL-FREE AXIAL FAN, ESPECIALLY FOR ELECTRICALLY DRIVED MOTOR VEHICLE RADIATOR FANS |
| DE3335648A1 (en) * | 1983-09-30 | 1985-04-18 | Siemens AG, 1000 Berlin und 8000 München | STEERING WHEELLESS AXIAL FAN, ESPECIALLY FOR VENTILATING HEAT EXCHANGERS |
| DE4140987A1 (en) * | 1991-12-12 | 1993-06-17 | Behr Gmbh & Co | AXIAL FAN |
| US5399070A (en) * | 1992-07-22 | 1995-03-21 | Valeo Thermique Moteur | Fan hub |
-
1996
- 1996-01-04 GB GB9600102A patent/GB2302141B/en not_active Expired - Fee Related
- 1996-01-19 CN CN 96100882 patent/CN1089142C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2302141B (en) | 1997-10-22 |
| CN1143730A (en) | 1997-02-26 |
| GB2302141A (en) | 1997-01-08 |
| GB9600102D0 (en) | 1996-03-06 |
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