Microwave grilling machine

Abstract

A microwave grilling machine comprises a box body and its shell, a cavity arranged in the shell, the cavity is provided with a cavity top wall, a first heat dissipation assembly, a second heat dissipation assembly, a magnetron, a variable frequency power supply, a microwave stirring motor and a waveguide box are arranged above the cavity top wall, the microwave stirring motor is arranged above the waveguide box, the first heat dissipation assembly is provided with a first exhaust fan and an air guide cover, the second heat dissipation assembly is provided with a second exhaust fan and an exhaust channel, and also comprises an air inlet and an air outlet arranged on the microwave grilling machine, and the front and rear ends of the air guide cover are provided with openings. The hot air discharged by the first heat dissipation assembly and the second heat dissipation assembly of the present invention is mixed, so that the hot air discharged at the air outlet is relatively uniform, which not only effectively dissipates the heat of the electrical components, but also prevents the air outlet from discharging excessively high heat.

Description

Technical Field

[0001] The invention relates to a cooking appliance, in particular to a microwave grill. Background Art

[0002] Microwave grills with microwave and grill functions include magnetrons and heating tubes for grilling. When heating food, magnetrons or heating tubes will generate heat, which needs to be effectively discharged out of the microwave grill cabinet to dissipate the heat of the electrical components in the cabinet, thereby protecting the electrical components in the cabinet. On the one hand, common microwave grills generally directly discharge the heat of the electrical components out of the cabinet, resulting in a high temperature of the discharged heat. If the human body comes into contact with the high temperature heat, it will feel uncomfortable. On the other hand, the heat dissipation effect of common microwave grills is not ideal. Therefore, further improvement is needed. Summary of the invention

[0003] The purpose of the present invention is to provide a microwave barbecue machine with uniform heat discharge, ideal heat dissipation effect, compact structure and installation, which effectively solves the problem of low heat dissipation efficiency of existing microwave barbecue machines and improves the heat dissipation effect, so as to overcome the shortcomings of the prior art.

[0004] A microwave grilling machine designed for this purpose comprises a box body and its shell, a cavity arranged in the shell, the cavity is provided with a cavity top wall, a first heat dissipation component, a second heat dissipation component, a magnetron, a frequency conversion power supply, a microwave stirring motor and a waveguide box are arranged above the cavity top wall, the microwave stirring motor is arranged above the waveguide box, the first heat dissipation component is provided with a first exhaust fan and an air guide cover, the second heat dissipation component is provided with a second exhaust fan and an exhaust channel, and also comprises an air inlet and an air outlet arranged on the microwave grilling machine, the front and rear ends of the air guide cover are provided with openings, and the characteristic is that the opening at the rear of the air guide cover is connected to the air inlet, the magnetron and the frequency conversion power supply are connected to the air guide cover, and the microwave stirring motor is arranged above the waveguide box. The power supplies are all arranged in the air guide cover, and the air inlet, the first exhaust fan, the air guide cover and the air outlet are connected in sequence to form a first heat dissipation channel for dissipating the heat of the magnetron and the variable frequency power supply, so that the cold air outside the box enters the air guide cover through the air inlet and the first exhaust fan, and the cold air outside flows to the variable frequency power supply and the magnetron and is blown to the air outlet through the first exhaust fan; the second exhaust fan is provided with an upper air inlet and a lower air inlet, and the microwave stirring motor is adjacent to the upper air inlet. The second exhaust fan inhales hot air around the microwave stirring motor through the upper air inlet to dissipate the heat of the microwave stirring motor and further protect the microwave stirring motor.

[0005] The upper air inlet, the lower air inlet, the exhaust channel and the air outlet are connected in sequence to form a second heat dissipation channel for auxiliary heat dissipation of the microwave stirring motor. The second heat dissipation component is also provided with a cold air inlet connected to the outside air. The cold air inlet is connected to the exhaust channel so that the outside cold air and the hot air inhaled from the microwave stirring motor are blown to the air outlet through the second exhaust fan. The hot air discharged from the first and second heat dissipation channels are mixed inside the air outlet and discharged outside the box. The hot air from the first and second heat dissipation channels is mixed inside the air outlet, and the hot air discharged from the air outlet is relatively uniform, thereby reducing the temperature of the hot air discharged from the air outlet.

[0006] The first and second exhaust fans are both vortex fans.

[0007] The air scoop includes a front air scoop upper cover and a rear air scoop upper cover. The front air scoop upper cover covers the magnetron, and the magnetron is located on the air scoop base. The rear air scoop upper cover covers the variable frequency power supply. A concave step is provided at the tail of the rear air scoop upper cover. A step air inlet is provided on the concave step. A first exhaust fan is provided below the step air inlet. The housing includes a rear cover plate and an upper cover plate. The air inlet is provided on the rear cover plate. A vertical enclosure wall extends upward from the concave step. The enclosure wall, the rear cover plate, and the upper cover plate enclose an air inlet channel connected to the air inlet. The wind entering the air inlet channel is completely cold wind from the outside of the box. A vertical enclosure wall is provided above the first exhaust fan to shorten the overall length of the first heat dissipation assembly, and the structure is compact.

[0008] The second heat dissipation component is also provided with an exhaust hood, an upper air guide hood located below the exhaust hood, and a lower air guide hood located below the upper air guide hood. An exhaust passage is formed between the exhaust hood and the upper air guide hood, and the second exhaust fan is located in the exhaust passage; the upper air guide hood and the lower air guide hood are both provided with notches that penetrate from top to bottom, and a waveguide box is arranged in the notches of the upper air guide hood and the lower air guide hood. A heat insulation hood for covering the waveguide box is provided above the waveguide box, the heat insulation hood is connected to the upper air guide hood, a motor fixing frame is provided above the heat insulation hood, and the microwave stirring motor is fixed on the motor fixing frame.

[0009] During operation, the heating tube under the top wall of the cavity will generate high-temperature heat. A heat shield is provided above the waveguide box to cover the waveguide box to prevent the high-temperature heat generated by the heating tube from being transferred to the microwave stirring motor and protect the microwave stirring motor. The microwave stirring motor is a core component. If it is damaged, the microwave injected into the cavity cannot be stirred, resulting in uneven heating of the food and easy microwave ignition problems.

[0010] The heat insulation cover is connected to the upper air guide cover, so that the heat on the heat insulation cover is transferred to the upper air guide cover, and the heat is taken away by the upper air guide cover and the second exhaust fan, thereby further reducing the heat transferred to the microwave stirring motor.

[0011] The top wall of the cavity is provided with a mounting boss, the waveguide box is transversely arranged on the top side of the cavity, the waveguide box is provided with a wave outlet and a wave inlet, one end of the wave outlet is fixedly connected to the mounting boss, and one end of the wave inlet is connected to the magnetron, the wind guide cover includes a wind guide cover base located below the magnetron, the magnetron is suspended above the top wall of the cavity, and the magnetron is supported by the wind guide cover base below. Since the magnetron is heavy and the magnetron is transversely fixed to one end of the wave inlet of the waveguide box, it is easily affected by external forces during transportation, causing the waveguide box to sink, thereby easily causing microwave leakage, and the support of the wind guide cover base effectively prevents the waveguide box from sinking; in addition, the wind guide cover base, the wind guide cover upper cover and the rear wind guide cover upper cover are assembled to form a wind guide cover for guiding air and dissipating heat for the magnetron and the variable frequency power supply, thereby ensuring the heat dissipation effect.

[0012] The microwave grill also includes an LED lighting assembly of the lighting cavity, the LED lighting assembly includes an LED lamp, an LED lamp radiator and a light guide column, and the second heat dissipation assembly is also provided with a fan cover covering the second exhaust fan, the fan cover is made of metal, and its periphery is integrally bent to form a folded edge, and the LED lamp radiator is closely attached to the folded edge. The LED lamp radiator is closely attached to the folded edge of the fan cover, and the heat of the LED lamp radiator is transferred to the folded edge of the metal fan cover. When the second exhaust fan is running, it takes away the heat of the folded edge in the metal fan cover, and then takes away the heat of the LED lamp radiator, so as to dissipate heat for the high-power LED lamp and extend the service life of the LED lamp.

[0013] A fixing piece for fixing the light guide column is provided at the bottom of the LED lamp heat sink. The light guide column is fixed on the fixing piece of the LED lamp heat sink, which facilitates the installation of the light guide column and improves assembly efficiency.

[0014] A pit is arranged in the middle of the top of the light guide column, and the LED lamp extends into the pit, so that the light emitted by the LED lamp can be completely projected into the light guide column, thereby improving the light conduction rate.

[0015] The second heat dissipation component is provided with an exhaust hood, an upper air guide hood and a lower air guide hood from top to bottom, an exhaust channel is formed between the exhaust hood and the upper air guide hood, an air intake channel connected to the exhaust channel is formed between the upper air guide hood and the lower air guide hood, the exhaust channel and the air intake channel are respectively connected to the lower air inlet, the air intake channel is provided with more than one cold air inlet, and the light guide column runs through the exhaust channel and the air intake channel from top to bottom and extends into the cavity. The heat in the cavity is easily transferred to the light guide column, and the heat enters the air intake channel and the exhaust channel along the light guide column. The heat on the light guide column is blown to the air outlet through the second exhaust fan, effectively dissipating the heat of the light guide column.

[0016] A heating tube is arranged below the top wall of the cavity, and the portion of the light guide column extending into the cavity is arranged at the outer periphery of the heating tube; in addition, an oblique surface facing the middle of the cavity is arranged at the bottom end of the light guide column. The heat at the outer periphery of the heating tube is lower than the heat in the middle, thereby preventing the light guide column from being too hot and being transmitted to the LED lamp, thus affecting the life of the LED lamp; at the same time, an oblique surface facing the middle of the cavity is arranged at the bottom end of the light guide column, so that the light emitted by the LED lamp can be transmitted to the center of the cavity to increase the irradiation area.

[0017] A heating tube is arranged on the top of the cavity, a microwave inlet is arranged in the middle of the cavity top wall, and a heat insulation board for transmitting microwaves is covered below the microwave inlet, the heat insulation board is located above the heating tube, and an upward bulge is arranged in the middle of the heat insulation board. The heat insulation board is a glass plate.

[0018] Since the heating tube at the top of the cavity is close to the microwave injection port, the heat of the heating tube and the smoke in the cavity are easily transmitted to the waveguide box, thereby affecting the microwave stirring motor and / or the magnetron. The heat insulation board can be arranged to insulate the heating tube at the top of the cavity and isolate the smoke; the heat insulation board is arranged to be convex upward in the middle, and the convex heat insulation board is compared with the flat heat insulation board. The convex heat insulation board can prevent the heat insulation board from being deformed and sunk due to the high temperature generated by the top heating tube, thereby reducing the heat insulation and smoke isolation effect.

[0019] The microwave barbecue machine also includes a motor linkage shaft connected to the microwave stirring motor, the motor linkage shaft passes through the bottom of the waveguide box, one end of the motor linkage shaft passing through the waveguide box is connected to a microwave stirring plate, the microwave stirring plate is provided with a straight bar portion and a hook portion, the straight bar portion is provided with a shaft connecting hole, the microwave stirring plate is connected to the motor linkage shaft through the shaft connecting hole; in the straight direction of the straight bar portion, the straight distance from the outer end of the straight bar portion to the center of the shaft connecting hole is S1, and the straight distance from the outer end of the hook portion to the center of the shaft connecting hole is S2, S1>S2.

[0020] The drive shaft of the microwave stirring motor drives the microwave stirring blade to rotate through the motor linkage shaft, and the rotation of the microwave stirring blade is used to radiate the input microwaves evenly into the cooking cavity. Setting S1>S2 can improve the uniformity of microwave stirring, so that the microwaves absorbed by each surface of the food are more uniform. Microwaves are scattered. When the microwave stirring blade rotates, S1>S2, that is, the contact area between the straight bar part and the microwave is increased, ensuring that the microwaves are rotated and stirred by the straight bar part during the scattering process, so as to improve the uniformity of the stirring microwaves.

[0021] An opening is provided at the front of the second heat dissipation component, the front opening of the air guide cover is connected to the front opening of the second heat dissipation component, and the two front openings together form an air outlet of the microwave barbecue machine. The hot air exhausted from the first heat dissipation component and the second heat dissipation component are mixed at the front openings that are interconnected, so that the hot air discharged from the air outlet is more uniform, which can reduce the maximum temperature of the air outlet.

[0022] The microwave barbecue machine also includes a door body and a control panel located above the door body. The door body and the control panel are arranged vertically spaced apart from each other, and the air outlet is located between the door body and the control panel.

[0023] The beneficial effects of the present invention are as follows:

[0024] a. The hot air discharged from the first heat dissipation component and the second heat dissipation component are mixed, so that the hot air discharged from the air outlet is more uniform, which not only effectively dissipates the heat of the electrical components, but also prevents the air outlet from discharging too high a temperature.

[0025] b. The structure of LED lighting components has been changed. When the cooking appliance is working, it not only improves the light conductivity and irradiation area of ​​the LED lamp, but also ensures the heat dissipation effect and effectively protects the LED lamp.

[0026] c. Improve the performance of microwave stirring blades so that food can absorb microwaves evenly when heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a microwave grill according to an embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of a microwave barbecue machine after the housing shell is disassembled according to an embodiment of the present invention.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 The figure is a schematic diagram of the exploded structure of a microwave grill according to an embodiment of the present invention.

[0031] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0032] Figure 6 This is a schematic diagram of the exploded structure of a microwave grilling machine in another aspect according to an embodiment of the present invention.

[0033] Figure 7 It is a schematic diagram of the exploded structure of the second heat dissipation component according to an embodiment of the present invention.

[0034] Figure 8 The figure is a schematic cross-sectional view of the internal structure of a microwave barbecue machine according to an embodiment of the present invention.

[0035] Fig. 9 It is a cross-sectional schematic diagram from another perspective of the internal structure of a microwave barbecue machine according to an embodiment of the present invention.

[0036] Fig.10 for Fig. 9 Enlarged view of point C in the middle.

[0037] Fig.11 It is a structural schematic diagram of a microwave grilling machine with a door body disassembled according to an embodiment of the present invention.

[0038] Fig.12 The figure is a schematic diagram of the structure of an LED lighting assembly of a microwave grill according to an embodiment of the present invention.

[0039] Fig.13 for Fig.12 Enlarged view of point D in the middle.

[0040] Fig.14 The figure is a schematic diagram of the connection structure between the microwave stirring motor and the waveguide box according to an embodiment of the present invention.

[0041] Fig.15 The figure is a schematic diagram of the structure of a microwave stirring blade according to an embodiment of the present invention.

[0042] In the figure, 1 is a box body, 1.1 is a shell, 1.2 is a rear cover, 1.3 is an air inlet, 1.4 is an upper cover, 2 is a cavity, 2.1 is a cavity top wall, 2.2 is a mounting boss, 3 is a magnetron, 4 is a variable frequency power supply, 5 is a microwave stirring motor, 6 is a first exhaust fan, 7 is a second exhaust fan, 7.1 is an upper air inlet, 7.2 is a lower air inlet, 8 is an air outlet, 9 is an air guide cover base, 10 is a front air guide cover upper cover, 11 is a rear air guide cover upper cover, 11.1 is a concave step, 11.2 is a step air inlet, 11.3 is an enclosed wall, 12 is an exhaust hood, 13 is an upper air guide hood, 13 .1 is a notch, 14 is a lower air guide cover, 14.1 is a notch, 15 is a waveguide box, 16 is a heat insulation cover, 17 is a motor fixing bracket, 18 is an LED lamp, 19 is an LED lamp radiator, 19.1 is a fixing part, 20 is a light guide column, 20.1 is a beveled surface, 20.2 is a pit, 21 is a fan cover, 21.1 is a folded edge, 22 is a heating pipe, 23 is a heat insulation board, 23.1 is a protrusion, 24 is a motor linkage shaft, 25 is a microwave stirring plate, 25.1 is a straight strip portion, 25.2 is a hook portion, 25.3 is an axis connecting hole, 26 is a door body, 27 is a control panel, and 28 is a cold air inlet. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] See also Figure 1-Figure 3A microwave barbecue machine comprises a box body 1 and its shell 1.1, a cavity 2 arranged in the shell 1.1, the cavity 2 is provided with a cavity top wall 2.1, a first heat dissipation component, a second heat dissipation component, a magnetron 3, a variable frequency power supply 4, a microwave stirring motor 5 and a waveguide box 15 are arranged above the cavity top wall 2.1, the microwave stirring motor 5 is arranged above the waveguide box 15, the first heat dissipation component is provided with a first exhaust fan 6 and an air guide cover, the second heat dissipation component is provided with a second exhaust fan 7 and an exhaust channel, and also includes an air inlet 1.3 and an air outlet 8 arranged on the microwave barbecue machine, the front and rear ends of the air guide cover are provided with openings, the opening at the tail of the air guide cover is connected to the air inlet 1.3, the magnetron 3 and the variable frequency power supply 4 are both arranged in the air guide cover, the air inlet 1.3, the first exhaust fan 6, the air guide cover and the air outlet 8 are connected in sequence to form a first heat dissipation channel for dissipating heat to the magnetron 3 and the variable frequency power supply 4, so that cold air from the outside of the box body 1 passes through the air inlet 1.3, The first exhaust fan 6 enters the air guide cover, and the external cold air flows to the variable frequency power supply 4, the magnetron 3 and is blown to the air outlet 8 through the first exhaust fan 6; the second exhaust fan 7 is provided with an upper air inlet 7.1 and a lower air inlet 7.2, and the microwave stirring motor 5 is adjacent to the upper air inlet 7.1. The heat generated by the microwave stirring motor 5 during operation enters the exhaust channel of the second heat dissipation component through the upper air inlet 7.1 to protect the microwave stirring motor 5; the upper air inlet 7.1, the lower air inlet 7.2, the exhaust channel and the air outlet 8 are connected in sequence to form a second heat dissipation channel for auxiliary heat dissipation of the microwave stirring motor 5, and the second heat dissipation component is also provided with a cold air inlet 28 connected to the outside air, and the cold air inlet 28 is connected to the exhaust channel, so that the external cold air and the hot air inhaled from the microwave stirring motor 5 are blown to the air outlet 8 through the second exhaust fan 7, and the hot air discharged from the first and second heat dissipation channels are mixed on the inner side of the air outlet 8 and discharged to the outside of the box body 1. The cold air from the outside of the second heat dissipation channel and the hot air sucked in by the microwave stirring motor 5 are mixed and blown toward the air outlet 8, and then mixed with the hot air from the variable frequency power supply 4 and the magnetron 3 blowing toward the air outlet 8, effectively reducing the temperature of the hot air discharged from the air outlet 8, and the hot air is discharged more evenly. The first and second exhaust fans 6 and 7 are both vortex fans.

[0045] The hot air discharged from the first heat dissipation channel flows in the following direction: Figure 8 Indicated by the arrow.

[0046] The front of the second heat dissipation assembly is provided with an opening, the front opening of the air guide cover is connected to the front opening of the second heat dissipation assembly, and the two front openings together form an air outlet 8 of the microwave barbecue machine, and the microwave barbecue machine also includes a door body 26 and a control panel 27 located above the door body 26, the door body 26 and the control panel 27 are arranged vertically spaced from each other, and the air outlet 8 is located between the door body 26 and the control panel 27. The hot air discharged from the first heat dissipation assembly and the second heat dissipation assembly are mixed at the front openings that are connected to each other, so that the hot air discharged from the air outlet 8 is relatively uniform, and the maximum temperature of the air outlet 8 can be reduced.

[0047] See also Figure 4-Figure 6 The air guide cover includes a front air guide cover upper cover 10 and a rear air guide cover upper cover 11. The front air guide cover upper cover 10 covers the magnetron 3, and the rear air guide cover upper cover 11 covers the variable frequency power supply 4. A concave step 11.1 is provided at the tail of the rear air guide cover upper cover 11. A step air inlet 11.2 is provided on the concave step 11.1, and a first exhaust fan 6 is provided below the step air inlet 11.2. The housing 1.1 includes a rear cover plate 1.2 and an upper cover plate 1.4. The air inlet 1.3 is provided on the rear cover plate 1.2. The concave step 11.1 extends upwardly to form a vertical enclosure wall 11.3. The enclosure wall 11.3, the rear cover plate 1.2, and the upper cover plate 1.4 enclose an air inlet channel connected to the air inlet 1.3. The wind entering the air inlet channel is completely cold wind from the outside of the box. A vertical enclosure wall is provided above the first exhaust fan to shorten the overall length of the first heat dissipation assembly, and the structure is compact. The enclosing wall is in an arc shape.

[0048] A mounting boss 2.2 is provided on the cavity top wall 2.1, and a waveguide box 15 is laterally arranged on the top side of the cavity 2. The waveguide box 15 is provided with a wave outlet and a wave inlet. One end of the wave outlet is fixedly connected to the mounting boss 2.2, and one end of the wave inlet is connected to the magnetron 3. The wind guide cover includes a wind guide cover base 9 located below the magnetron 3. The magnetron 3 is suspended above the cavity top wall 2.1, and the magnetron 3 is supported by the wind guide cover base 9 below.

[0049] Since the magnetron 3 is heavy and is transversely fixed to one end of the wave inlet of the waveguide box 15, it is easily affected by external forces during transportation, causing the waveguide box 15 to sink, which is easy to cause microwave leakage. The support of the wind guide cover base 9 effectively prevents the waveguide box 15 from sinking; in addition, the wind guide cover base 9, the wind guide cover upper cover 10 and the rear wind guide cover upper cover 11 are assembled to form a wind guide cover for guiding air and dissipating heat for the magnetron 3 and the variable frequency power supply 4, ensuring the heat dissipation effect. The cold air outside the box enters the wind guide cover through the air inlet 1.3, and the cold air outside flows to the variable frequency power supply 4 and the magnetron 3. After the cold air outside takes away the heat generated by the variable frequency power supply 4 and the magnetron 3, it is blown to the air outlet 8 by the first exhaust fan 6. The variable frequency power supply 4 and the magnetron 3 are effectively cooled.

[0050] See also Figure 7-Figure 8The second heat dissipation assembly is also provided with an exhaust hood 12, an upper air guide hood 13 located below the exhaust hood 12, and a lower air guide hood 14 located below the upper air guide hood 13. An exhaust channel is formed between the exhaust hood 12 and the upper air guide hood 13, and the second exhaust fan 7 is located in the exhaust channel; the upper air guide hood 13 and the lower air guide hood 14 are both provided with notches 13.1 and 14.1 that penetrate from top to bottom, and a waveguide box 15 is arranged in the notches 13.1 and 14.1 of the upper air guide hood 13 and the lower air guide hood 14. A heat insulation hood 16 for covering the waveguide box 15 is provided above the waveguide box 15, and the heat insulation hood 16 is connected to the upper air guide hood 13. A motor fixing bracket 17 is provided above the heat insulation hood 16, and the microwave stirring motor 5 is fixed on the motor fixing bracket 17.

[0051] Since the cavity 2 is provided with a heating tube 22, and the heating tube 22 is located at the top of the cavity 2, the heating tube 22 below the cavity top wall 2.1 will generate high-temperature heat during operation, so a heat insulation cover 16 for covering the waveguide box 15 is provided above the waveguide box 15 to prevent the high-temperature heat generated by the heating tube 22 from being transferred to the microwave stirring motor 5 located in the waveguide box 15, so as to protect the microwave stirring motor 5. The microwave stirring motor 5 is a core component, and if it is damaged, it will not be able to stir the microwaves injected into the cavity 2, resulting in uneven heating of the food and easy microwave ignition problems.

[0052] The heat insulation cover 16 is connected to the upper air guide cover 13, so that the heat on the heat insulation cover 16 is transferred to the upper air guide cover 13, and the heat is taken away by the upper air guide cover 13 and the second exhaust fan 7, thereby further reducing the heat transferred to the microwave stirring motor 5.

[0053] See also Figure 9-11 A heating tube 22 is provided at the top of the cavity 2, a microwave inlet is provided in the middle of the cavity top wall 2.1, and a heat insulation board 23 for transmitting microwaves is covered below the microwave inlet. The heat insulation board 23 is located above the heating tube 22, and an upward protrusion 23.1 is provided in the middle of the heat insulation board 23.

[0054] Since the heating tube 22 at the top of the cavity 2 is close to the microwave injection port, the heat of the heating tube 22 and the smoke in the cavity 2 are easily transmitted to the waveguide box 15, thereby affecting the microwave stirring motor 5 and / or the magnetron 3. The heat insulation board 23 is arranged to insulate the heating tube 22 located at the top of the cavity 2 and isolate the smoke; the heat insulation board 23 is arranged to be convex upward in the middle. Compared with the flat heat insulation board, the convex heat insulation board 23 can prevent the heat insulation board from being deformed and sunk due to the high temperature generated by the top heating tube 22, thereby reducing the heat insulation and smoke isolation effect.

[0055] The heat insulation plate 23 is a glass plate.

[0056] See also Figure 12-13The microwave grill also includes an LED lighting assembly of the lighting cavity 2, the LED lighting assembly includes an LED lamp 18, an LED lamp radiator 19 and a light guide column 20, and the second heat dissipation assembly is also provided with a fan cover 21 covering the second exhaust fan 7, the fan cover 21 is made of metal, and its periphery is integrally bent to form a folded edge 21.1, and the LED lamp radiator 19 is closely attached to the folded edge 21.1. The LED lamp radiator 19 is closely attached to the folded edge 21.1 of the fan cover 21, and the heat of the LED lamp radiator 19 is transferred to the folded edge 21.1 of the metal fan cover 21. When the second exhaust fan 7 is running, it takes away the heat of the folded edge 21.1 in the metal fan cover 21, and then takes away the heat of the LED lamp radiator 19, so as to dissipate the heat of the high-power LED lamp 18 and extend the service life of the LED lamp 18.

[0057] A fixing piece 19.1 for fixing the light guide column 20 is provided at the bottom of the LED lamp heat sink 19, and the light guide column 20 is fixed on the fixing piece 19.1 of the LED lamp heat sink 19; when installing, the light guide column is first passed through and inserted into the fixing piece, and a limiting groove and a limiting step are provided between the fixing piece and the light guide column to limit the displacement of the light guide column when it is inserted into the fixing piece downward. By providing the fixing piece 19.1, it is easy to install the light guide column 20.

[0058] A pit 20.2 is provided in the middle of the top of the light guide column 20, and the LED lamp 18 extends into the pit 20.2, so that the light emitted by the LED lamp 18 can be completely emitted into the light guide column 20, and the light emitted by the LED lamp 18 is covered by the pit 22, and the light is not easy to disperse, so as to improve the light conduction rate.

[0059] The second heat dissipation component is provided with an exhaust hood 12, an upper air guide hood 13 and a lower air guide hood 14 from top to bottom, an exhaust channel is formed between the exhaust hood 12 and the upper air guide hood 13, an air intake channel connected to the exhaust channel is formed between the upper air guide hood 13 and the lower air guide hood 14, and the air intake channel is provided with more than one cold air inlet 28, and the light guide column 20 penetrates the exhaust channel and the air intake channel from top to bottom and extends into the cavity 2; the heat in the cavity 2 is easily conducted to the light guide column 20, and the heat enters the air intake channel and the exhaust channel of the second heat dissipation component along the light guide column 20, and the heat on the light guide column 20 blows the air outlet 8 through the second exhaust fan 7, effectively dissipating the heat of the light guide column 20, preventing the light guide column 20 from accumulating too much heat and being unable to dissipate heat, causing the heat to be conducted to the LED lamp 18, thereby affecting the life of the LED lamp 18.

[0060] The bottom end of the light guide column 20 is provided with an oblique surface 20.1 facing the middle direction of the cavity 2. The bottom end of the light guide column 20 is provided with an oblique surface 20.1 facing the middle direction of the cavity 2, so that the light emitted by the LED lamp 18 can be transmitted to the center direction of the cavity 2 to increase the irradiation area. After the light emitted by the LED lamp 18 is transmitted to the light guide column 20, the light is transmitted to the center direction of the cavity 2 along the oblique surface 20.1.

[0061] The cavity 2 is provided with a cavity top wall 2.1, and a heating tube 22 is provided below the cavity top wall 2.1. The portion of the light guide column 20 extending into the cavity 2 is arranged at the outer periphery of the heating tube 22; the heat at the outer periphery of the heating tube 22 is lower than the heat in the middle, thereby preventing the light guide column 20 from having an excessively high temperature and being transmitted to the LED lamp 18, thereby affecting the life of the LED lamp 18.

[0062] See also Figure 14-15 The microwave barbecue machine also includes a motor linkage shaft 24 that is connected to the microwave stirring motor 5. The motor linkage shaft 24 passes through the bottom of the waveguide box 15. One end of the motor linkage shaft 24 that passes through the waveguide box 15 is connected to a microwave stirring piece 25. The microwave stirring piece 25 is provided with a straight bar portion 25.1 and a hook portion 25.2. The straight bar portion 25.1 is provided with a shaft connecting hole 25.3. The microwave stirring piece 25 is connected to the motor linkage shaft 24 through the shaft connecting hole 25.3; in the straight direction of the straight bar portion 25.1, the straight distance from the outer end of the straight bar portion 25.1 to the center of the shaft connecting hole 25.3 is S1, and the straight distance from the outer end of the hook portion 25.2 to the center of the shaft connecting hole 25.3 is S2, and S1>S2.

[0063] The drive shaft of the microwave stirring motor drives the microwave stirring blade to rotate through the motor linkage shaft, and the rotation of the microwave stirring blade is used to radiate the input microwaves evenly into the cooking cavity. Setting S1>S2 can improve the uniformity of microwave stirring, so that the microwaves absorbed by each surface of the food are more uniform. Microwaves are scattered. When the microwave stirring blade rotates, S1>S2, that is, the contact area between the straight bar part and the microwave is increased, ensuring that the microwaves are rotated and stirred by the straight bar part during the scattering process, so as to improve the uniformity of the stirring microwaves.

[0064] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A microwave barbecue machine, comprising a box body (1) and a shell (1.1), a cavity (2) arranged in the shell (1.1), the cavity (2) being provided with a cavity top wall (2.1), a first heat dissipation component, a second heat dissipation component, a magnetron (3), a variable frequency power supply (4), a microwave stirring motor (5) and a waveguide box (15) being arranged above the cavity top wall (2.1), the microwave stirring motor (5) being arranged above the waveguide box (15), the first heat dissipation component being provided with a first exhaust fan (6) and an air guide cover, the second heat dissipation component being provided with a second exhaust fan (7) and an exhaust passage, and also comprising an air inlet (1.3) and an air outlet (8) arranged on the microwave barbecue machine, the air guide cover being provided with openings at both the front and rear ends, wherein the microwave barbecue machine is characterized in that The opening at the rear of the air guide cover is connected to the air inlet (1.3); the magnetron (3) and the variable frequency power supply (4) are both arranged in the air guide cover; the air inlet (1.3), the first exhaust fan (6), the air guide cover and the air outlet (8) are connected in sequence to form a first heat dissipation channel for dissipating heat from the magnetron (3) and the variable frequency power supply (4); so that cold air from the outside of the box (1) enters the air guide cover through the air inlet (1.3) and the first exhaust fan (6); the cold air from the outside flows toward the variable frequency power supply (4) and the magnetron (3) and is blown toward the air outlet (8) through the first exhaust fan (6); the second exhaust fan (7) is provided with an upper air inlet (7.1) and a lower air inlet ( 7.2), the microwave stirring motor (5) is adjacent to the upper air inlet (7.1), the upper air inlet (7.1), the lower air inlet (7.2), the exhaust passage and the air outlet (8) are connected in sequence to form a second heat dissipation passage for auxiliary heat dissipation of the microwave stirring motor (5), the second heat dissipation component is also provided with a cold air inlet (28) connected to the outside air, the cold air inlet (28) is connected to the exhaust passage, so that the outside cold air and the hot air sucked from the microwave stirring motor (5) are blown to the air outlet (8) through the second exhaust fan (7), and the hot air discharged from the first and second heat dissipation passages are mixed inside the air outlet (8) and discharged to the outside of the box (1); The air guide cover comprises a front air guide cover upper cover (10) and a rear air guide cover upper cover (11); the front air guide cover upper cover (10) covers the magnetron (3), and the rear air guide cover upper cover (11) covers the variable frequency power supply (4); a concave step (11.1) is provided at the rear of the rear air guide cover upper cover (11); a step air inlet (11.2) is provided on the concave step (11.1); a first exhaust fan (6) is provided below the step air inlet (11.2); the housing (1.1) comprises a rear cover plate (1.2) and an upper cover plate (1.4); the air inlet (1.3) is provided on the rear cover plate (1.2); the concave step (11.1) extends upward to form a vertical enclosure wall (11.3); the enclosure wall (11.3), the rear cover plate (1.2), and the upper cover plate (1.4) together form an air inlet channel connected to the air inlet (1.3); The second heat dissipation assembly is further provided with an exhaust hood (12), an upper air guide hood (13) located below the exhaust hood (12), and a lower air guide hood (14) located below the upper air guide hood (13); an exhaust passage is formed between the exhaust hood (12) and the upper air guide hood (13); and the second exhaust fan (7) is located in the exhaust passage; both the upper air guide hood (13) and the lower air guide hood (14) are provided with a notch ( 13.1, 14.1), a waveguide box (15) is arranged in the notches (13.1, 14.1) of the upper air guide cover (13) and the lower air guide cover (14), a heat insulation cover (16) for covering the waveguide box (15) is arranged above the waveguide box (15), the heat insulation cover (16) is connected to the upper air guide cover (13), a motor fixing frame (17) is arranged above the heat insulation cover (16), and the microwave stirring motor (5) is fixed on the motor fixing frame (17); The second heat dissipation assembly is provided with an exhaust hood (12), an upper air guide hood (13) and a lower air guide hood (14) from top to bottom, an exhaust passage is formed between the exhaust hood (12) and the upper air guide hood (13), an air intake passage connected to the exhaust passage is formed between the upper air guide hood (13) and the lower air guide hood (14), and the air intake passage is provided with one or more cold air inlets (28); An opening is provided at the front of the second heat dissipation component, the front opening of the air guide cover is connected to the front opening of the second heat dissipation component, and the two front openings together form an air outlet (8) of the microwave barbecue machine.

2. The microwave grill according to claim 1, characterized in that Cavity top wall (2.1) is provided with a mounting boss (2.2), a waveguide box (15) is transversely arranged on the top side of the cavity (2), the waveguide box (15) is provided with a wave outlet and a wave inlet, one end of the wave outlet is fixedly connected to the mounting boss (2.2), and one end of the wave inlet is connected to the magnetron (3), the wind guide cover includes a wind guide cover base (9) located below the magnetron (3), the magnetron (3) is suspended above the cavity top wall (2.1), and the magnetron (3) is supported by the wind guide cover base (9) below.

3. The microwave grill according to claim 1, characterized in that The invention also comprises an LED lighting assembly of the lighting cavity (2), wherein the LED lighting assembly comprises an LED lamp (18), an LED lamp heat sink (19) and a light guide column (20); the second heat sink assembly is further provided with a fan cover (21) for covering the second exhaust fan (7); the fan cover (21) is made of metal and its periphery is integrally bent to form a folded edge (21.1); the LED lamp heat sink (19) is closely attached to the folded edge (21.1); a fixing piece (19.1) for fixing the light guide column (20) is provided at the bottom of the LED lamp heat sink (19); the light guide column (20) is fixed to the fixing piece (19.1) of the LED lamp heat sink (19); a recess (20.2) is provided in the middle of the top of the light guide column (20), and the LED lamp (18) extends into the recess (20.2).

4. The microwave grill according to claim 3, characterized in that The light guide column (20) penetrates the exhaust passage and the air intake passage from top to bottom and extends into the cavity (2); the cavity (2) is provided with a cavity top wall (2.1), a heating tube (22) is provided below the cavity top wall (2.1), and the portion of the light guide column (20) extending into the cavity (2) is provided at the outer periphery of the heating tube (22); in addition, the bottom end of the light guide column (20) is provided with an oblique cut surface (20.1) facing the middle direction of the cavity (2).

5. The microwave grill according to claim 1, characterized in that A heating tube (22) is provided at the top of the cavity (2); a microwave injection port is provided in the middle of the cavity top wall (2.1); a heat insulation board (23) for transmitting microwaves is covered below the microwave injection port; the heat insulation board (23) is located above the heating tube (22); and an upward protrusion (23.1) is provided in the middle of the heat insulation board (23).

6. The microwave grill according to claim 1, characterized in that The invention also comprises a motor linkage shaft (24) connected to the microwave stirring motor (5), the motor linkage shaft (24) passing through the bottom of the waveguide box (15), one end of the motor linkage shaft (24) passing through the waveguide box (15) being connected to a microwave stirring plate (25), the microwave stirring plate (25) being provided with a straight bar portion (25.1) and a hook portion (25.2), the straight bar portion (25.1) being provided with a shaft connection hole (25.3), the microwave stirring plate (25) being connected to the motor linkage shaft (24) via the shaft connection hole (25.3); in the straight direction of the straight bar portion (25.1), the straight distance from the outer end of the straight bar portion (25.1) to the center of the shaft connection hole (25.3) is S1, and the straight distance from the outer end of the hook portion (25.2) to the center of the shaft connection hole (25.3) is S2, and S1>S2.

7. The microwave grill according to claim 1, characterized in that The microwave barbecue machine further comprises a door body (26) and a control panel (27) located above the door body (26); the door body (26) and the control panel (27) are arranged vertically spaced apart from each other, and the air outlet (8) is located between the door body (26) and the control panel (27).

Images