CN1715785A - Heater cover of microwave oven - Google Patents

Abstract

The heater cover of microwave oven is on the heater set in the airflow passage inside microwave oven and has openings on two side perpendicular to the airflow for communicating the inside and the outside, the opening in the side on air inflow direction has area greater than that in the side on air outflow direction. The opening in the side on air inflow direction is one rectangular one, whereas that in the side on air outflow direction consists of several circular ports with setting position higher than that of the rectangular one. The heater cover can transfer the heat the heater generates to the blowing fan inside the cooking chamber without need of additional parts, resulting in reduced microwave oven parts number.

Description

The heater of microwave oven lid

Technical field

The present invention relates to a kind of micro-wave oven, particularly relate to a kind of heater of microwave oven lid that the heater that is arranged in the micro-wave oven can be closed.

Background technology

Micro-wave oven is a kind of device for cooking that utilizes microwave to come heat food.Up-to-date micro-wave oven also utilizes heater as thermal source except utilizing microwave as the thermal source.Fig. 1 is the micro-wave oven primary structure exploded perspective view of prior art.As shown in Figure 1, in the micro-wave oven of this prior art, cavity 10 inside that form the micro-wave oven framework have cooking room 11.The heat that can utilize microwave or heater to produce in cooking room 11 comes heat food, and can utilize the not shown door for microwave oven that rotatably is arranged on the cavity 10 to come selectivity to open and close its inner space.The top panel 13 of cavity 10 is provided with various electronic units such as the magnetron 21 that utilizes vibration to produce microwave and high-tension transformer 23.In addition, the right side of top panel 13 also is provided with the draught fan assembly 25 that can cool off above-mentioned electronic unit.Draught fan assembly 25 is made up of a pair of ventilating fan 27,28 and the fan electromotor 29 that can drive ventilating fan 27,28.Front panel 15 upper ends of cavity 10 are formed with suction unit 16, and backplate 18 1 sides of cavity 10 then are formed with suction hole 19.The lower end of front panel 15 has exhaust outlet 17, and the air of being sent by draught fan assembly 25 is discharged by exhaust outlet 17 after cooling off above-mentioned electronic unit.One side of top panel 13 is provided with the heater 31,33 that is connected with cooking room 11.Heater 31,33 constitutes by the halogen heater of cooking by radiation effects 31 with by the ceramic heater 33 that convection action is cooked, and utilizes the reflecting plate 35 that is formed with a plurality of passages 35 ' on it to seal.Halogen heater 31 is arranged on the left side of ceramic heater 33, and is provided with near convection fan 37.Side near reflecting plate 35 on the top panel 13 is provided with the convection fan 37 that is connected with cooking room 11.Convection fan 37 can cool off this heater when utilizing halogen heater 31 to cook, and by convection action the heat that ceramic heater 33 produces is offered cooking room 11 when utilizing ceramic heater 33 to cook.The top of reflecting plate 35 has cover of heater 39.Cover of heater 39 is except that the effect with sealing reflecting plate 35, and the air communication that convection fan 37 is formed is crossed the inside that heater 31,33 backs flow into cooking room 11.Micro-wave oven internal gas flow flow regime with said structure is as follows: at first, under the effect of draught fan assembly 25, suck air outside from suction unit 16 and suction hole 19, institute's leaked-in air flows on top panel 13 from right to left, the while cooling electronic components, side along cavity 10 flows downward then, is discharged to the outside by exhaust portion 17 at last.And under the effect of convection fan 37, the air of cooking room 11 inside can flow into the inside of cover of heater 39.The air that flows into cover of heater 39 inside can flow into the inside of cooking room 11 once more under the effect of convection fan 37.Halogen heater 31 is cooled in this process, and the heat of ceramic heater 33 then offers cooking room 11.But there is following problem in the heater of microwave oven of this prior art lid: the air-flow that is produced by draught fan assembly 25 can prevent that in cooling settings the heat that heater 31,33 produces from passing to electronic unit on top panel 13 in the various electronic units.But because cover of heater 39 closes reflecting plate 35 and heater 31,33, so the air-flow that utilizes draught fan assembly 25 to produce can not be with heater 31, the 33 heat transferred cooking rooms 11 that produce, be heater 31, the 33 heat transferred cooking rooms 11 that produce also need to be provided with convection fan 37 except draught fan assembly 25 is set.

Summary of the invention

In order to address the above problem, the object of the present invention is to provide a kind of heater of microwave oven lid of forming micro-wave oven member number that reduces.

In order to achieve the above object, heater of microwave oven lid provided by the invention is arranged on the mobile path of micro-wave oven internal gas flow, and inside is provided with a heater at least, described heater of microwave oven cover with the perpendicular two sides of air current flow direction on be respectively equipped with the peristome that can be communicated with the inside and outside, and air-flow flows into peristome sectional area on its inner entrance side and is greater than the peristome sectional area of air-flow on its inner discharge side of discharging.

The peristome that described air-flow flows on its inner entrance side is the rectangle ventilating part, and is a plurality of circle vents with air-flow from the peristome on its inner discharge side of discharging.

Described ventilating part than blow vent that the position is set is low.

Heater of microwave oven lid provided by the invention need not additionally to be provided with the Air Blast fan of the heat transferred cooking room inside that heater is produced, thereby can reduce the parts number that constitutes micro-wave oven.

Description of drawings

Below in conjunction with the drawings and specific embodiments heater of microwave oven lid of the present invention is elaborated.

Fig. 1 is the micro-wave oven primary structure exploded perspective view of prior art.

Fig. 2 is the micro-wave oven primary structure exploded perspective view with cover of heater of the present invention.

Fig. 3 is the cover of heater side sectional view among Fig. 2.

Fig. 4 a and Fig. 4 b illustrate the level and the longitudinal sectional view of micro-wave oven internal gas flow flow condition among Fig. 2 respectively.

Accompanying drawing critical piece label:

50: cavity 51: cooking room

52: steam vent 53: top panel

54: through hole 55: front panel

56: suction unit 57: exhaust outlet

58: backplate 59: suction hole

61: magnetron 63: high-tension transformer

65: 67: the first ventilating fans of draught fan assembly

Ventilating fan 69 in 68: the second: fan electromotor

71: halogen heater 73: ceramic heater

75: reflecting plate 75 ': passage

77: guide duct 79: breather line

81: cover of heater 83: ventilating part

85: blow vent 86: the side conduit

88: the second side streams of 87: the first side streams

89: the bottom stream

The specific embodiment

As Fig. 2, shown in Figure 3, in micro-wave oven provided by the invention, the inside of cavity 50 has can carry out the cooking room 51 that selectivity opens and closes by not shown door for microwave oven.The top panel 53 of cavity 50 is provided with the electronic unit that utilization vibrations such as magnetron 61 and high-tension transformer 63 produce microwave.The right side of top panel 53 is provided with draught fan assembly 65.Draught fan assembly 65 can form the air-flow of the above-mentioned electronic unit of cooling, and its fan electromotor 69 by an a pair of ventilating fan 67,68 and a driving ventilating fan 67,68 is formed.Front panel 55 tops of cavity 50 and a side of backplate 58 are formed with suction unit 56 and suction hole 59 respectively.Magnetron 61 is near the ventilating fan 67 of draught fan assembly 65, be positioned at first ventilating fan 67 of micro-wave oven front side in 68 and be provided with, high-tension transformer 63 is then near ventilating fan 67, be positioned at second ventilating fan 68 of micro-wave oven rear side in 68 and be provided with, and the air-flow that magnetron 61 and high-tension transformer 63 utilize the ventilating fan close with it 67,68 to produce respectively cools off.In addition, first air-flow that also has bootable cooling magnetron 61 on the top panel 53 separates the guide duct 77 of second air-flow that cools off high-tension transformer 63 simultaneously.One end of guide duct 77 is connected the discharge portion of first ventilating fan 67, and the other end then extends to the front end of cavity 50, and its inside is provided with magnetron 61.Shown in Fig. 4 a, the front end of top panel 53 is provided with and is connected with guide duct 77 and breather line 79 that along continuous straight runs forms.Be formed with the air flow circuit that first air flow stream that can make the guide duct 77 of flowing through is crossed between top panel 53 and the breather line 79.On the top panel 53 of the air flow circuit inside that forms between by top panel 53 and breather line 79, be provided with a plurality of through holes 54.Can send first air-flow that flows through air flow circuit to cooking room 51 by through hole 54.Shown in Fig. 4 b, be formed with steam vent 52 on cooking room 51 sides relative with draught fan assembly 65, first air-flow that flows into cooking room 51 inside can be discharged to the outside of cooking room 51 by steam vent 52.As shown in Figure 2, the left side of high-tension transformer 63 is provided with halogen heater 71 and ceramic heater 73.As the thermal source beyond the microwave, heater 71,73 can be with the heat transferred cooking room 51 of its generation.Heater 71,73 is along the flow direction setting perpendicular to second air-flow, and halogen heater 71 is with respect to ceramic heater 73 more close draught fan assemblies 65.Because heater 71,73 and cooking room 51 are interconnected, so it can be with the heat transferred cooking room 51 that produces.The top of heater 71,73 is provided with the reflecting plate 75 that is formed with a plurality of passages 75 ' on it.Reflecting plate 75 can be given cooking room 51 with the reflect heat that heater 71,73 produces, thereby has the effect of heat transfer.The top of reflecting plate 75 is crossed the air-flow of ventilating fan 67,68 formation and is provided with cover of heater 81 along fore-and-aft direction.As shown in Figure 3, cover of heater 81 is open and relative length and the highly lower hexahedral shape of width for the bottom, and its both sides are formed with ventilating part 83 and blow vent 85 respectively.Ventilating part 83 is arranged in cover of heater 81 two sides near on the side of ventilating fan 67,68, and it forms along fore-and-aft direction.Slit on top panel 53 and the cover of heater 81 between this lower end, side is ventilating part 83.And the side of the cover of heater 81 relative with ventilating part 83 is provided with a plurality of blow vents 85.The sectional area summation of blow vent 85 is less than the sectional area of ventilating part 83.The front and back side that runs through cover of heater 81, the two ends of heater 71,73 are outstanding to the outside.And cavity 50 sides relative with draught fan assembly 65 are provided with side conduit 86.Be formed with the first side stream 87 between one side of side conduit 86 and the side of cavity 50, and be formed with the second side stream 88 between the side of the casing 90 of the opposite side of side conduit 86 and formation micro-wave oven external structure.The effect of the first side stream 87 be will be in cooking room 51 first air-flow of the discharging bottom stream 89 that will illustrate below causing in circulation back by steam vent 52.The effect of the second side stream 88 is that second air-flow by high-tension transformer 63 and heater 71,73 is caused bottom stream 89.Shown in Fig. 4 b, the bottom of microwave oven cavity 50 is provided with bottom stream 89.Bottom stream 89 is to be formed by the bottom surface of cavity 50 and not shown micro-wave oven baseboard.Front panel 55 bottoms that are positioned at bottom stream 89 front ends are provided with a plurality of exhaust outlets 57, first air-flow and second air-flow from the first side stream 87 and the second side stream 88 can be discharged to the outside by exhaust outlet 57.Below with reference to Fig. 4 a and Fig. 4 b micro-wave oven internal gas flow mobility status of the present invention is described.Shown in Fig. 2, Fig. 4 a and Fig. 4 b, after draught fan assembly 65 drives, can suck air outside by the suction unit 56 that is formed on cavity 50 front panels 55.Institute's inhaled air is positioned in draught fan assembly 65 and forms first air-flow on first ventilating fan 67 of micro-wave oven front end.First air-flow can cool off magnetron 61 in left side in figure when flowing.The air flow circuit that first air-flow behind the cooling magnetron 61 forms between inflow cavity 50 front ends under the guiding of guide duct 77 are by breather line 79 and top panel 53, the through hole 54 that passes through air flow circuit inside then flows into the inside of cooking rooms 51.Because through hole 54 is formed on the front end of the top surface of cavity 50, so first air-flow that flows into cooking room 51 inside by through hole 54 will flow near the door for microwave oven of not shown opened and closed cooking room 51.Its temperature can raise relatively when first air-flow cooling magnetron 61, thereby it has the effect of air curtain, so the moisture that evaporates from food in the gastronomical process will condense in door for microwave oven, especially door for microwave oven is on glass, and so the operator just can observe with the naked eye the state in the cooking room 51 easily.First air-flow can be discharged to the first side stream 87 by the steam vent 52 that is formed on cooking room 51 1 sides under the water vapour situations that are being mingled with cooking room 51 inner generations.And along with being rotated further of draught fan assembly 65, air-flow will move down and flow into bottom stream 89, be discharged to the outside by the exhaust outlet 57 that is formed on bottom stream 89 front ends at last.Simultaneously, shown in Fig. 2, Fig. 4 a and Fig. 4 b, after draught fan assembly 65 drives, also can suck air outside by the suction hole 59 that is formed on cavity 50 backplates 58.Institute's inhaled air forms second air-flow on second ventilating fan 68 that is positioned at the micro-wave oven rear side in the ventilating fan 67,68 of draught fan assembly 65.Second air-flow will flow into from the ventilating part 83 that is formed on cover of heater 81 1 sides, discharges by the blow vent 85 that is formed on ventilating part 83 opposite sides then.But, because the sectional area of the blow vent 85 of discharge second air-flow is less than the sectional area of ventilating part 83, so in cover of heater 81 outside discharges, can cool off heater 71 by blow vent 85 by the part in second air-flow of ventilating part 83 inflow cover of heaters 81,73, especially cool off halogen heater 71.And the remainder in second air-flow will then flow into the inside of cooking room 51 by heater 71,73.This moment second stream have can be with heater 71,73, the especially effect of the heat transferred cooking room 51 that produces of ceramic heater 73.In addition, second air-flow also can cool off the front and back end of running through cover of heater 81 and outstanding externally heater 71,73 two ends, thereby can prevent that the heat that heater 71,73 produces from damaging high-tension transformer 63 electronic units such as grade.Part in second air-flow that blow vent 85 by cover of heater 81 is discharged will enter the second side stream 88 under the effect of second ventilating fan 68, be discharged to the outside by exhaust outlet 57 then.Have heater 71,73 owing to flow into the remainder of second air-flow of cooking room 51 inside, especially therefore the heat of ceramic heater 73 generations utilizes this heat can the food of cooking room 51 inside be heated.Second air-flow after the heat food will be discharged to the first side stream 87 by the steam vent 52 that is formed on cooking room 51 sides, and second air-flow can be removed the water vapour of cooking room 51 inside in this process.This air-flow will flow into the bottom stream 89 that is connected with the first side stream 87 then, and the exhaust outlet 57 by bottom stream 89 front ends is discharged to the outside at last.

Claims (3)

1, a kind of heater of microwave oven lid, be arranged on the mobile path of micro-wave oven internal gas flow, and inside is provided with a heater at least, it is characterized in that: described heater of microwave oven cover with the perpendicular two sides of air current flow direction on be respectively equipped with the peristome that can be communicated with the inside and outside, and air-flow flows into peristome sectional area on its inner entrance side and is greater than the peristome sectional area of air-flow on its inner discharge side of discharging.

2, heater of microwave oven lid according to claim 1, it is characterized in that: the peristome that described air-flow flows on its inner entrance side is rectangle ventilating part (83), and is a plurality of circle vents (85) with air-flow from the peristome on its inner discharge side of discharging.

3, heater of microwave oven according to claim 1 lid is characterized in that: described ventilating part (83) than blow vent (85) that the position is set is low.

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