CN111059582A

CN111059582A - Microwave cooking appliance

Info

Publication number: CN111059582A
Application number: CN201911363805.1A
Authority: CN
Inventors: 廖波; 李伟国; 韦雪兵
Original assignee: Guangdong Galanz Enterprises Co Ltd; Guangdong Galanz Microwave Electric Manufacturing Co Ltd
Current assignee: Guangdong Galanz Enterprises Co Ltd; Guangdong Galanz Microwave Electric Manufacturing Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-24

Abstract

The invention relates to a microwave cooking appliance which comprises a box body shell, a cooking cavity arranged in the box body shell, a cooling fan, a variable frequency power supply, a magnetron, a control circuit board and a first air guide piece. The cooling fan, the variable frequency power supply, the magnetron and the control circuit board are arranged on the outer wall of the cooking cavity, and a middle accommodating space is further arranged on the outer wall of the cooking cavity. The variable frequency power supply is provided with a power supply shell with two through sides, and the magnetron is provided with a tube shell with two through sides. The first air flow shunted at the air outlet of the cooling fan sequentially flows through the power supply shell, the first air guide piece and the pipe shell, and the second air flow shunted at the air outlet of the cooling fan flows into the middle accommodating space. The three main heating components of the variable frequency power supply, the magnetron and the control circuit board can be well radiated; only one cooling fan is needed, so that the cost is low; the structure is compact, thereby effectively reducing the volume of the whole machine or improving the capacity of the cooking cavity and realizing the volume miniaturization.

Description

Microwave cooking appliance

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a microwave cooking appliance.

Background

The microwave cooking appliance refers to an appliance with a microwave cooking function, such as a microwave oven, a microwave steam box, and a micro-steaming and baking integrated product. When the microwave cooking appliance has more than two functions of micro-steaming and baking, corresponding heating functional devices need to be arranged in the microwave cooking appliance. However, arranging the corresponding heating function device will put high demands on compact layout and all-around heat dissipation of the product, and especially arranging on some small-sized microwave cooking appliances, the arrangement difficulty is high.

Disclosure of Invention

Based on this, it is necessary to overcome the defects of the prior art and provide a microwave cooking appliance which can realize compact structure, reasonable arrangement and small volume.

The technical scheme is as follows: a microwave cooking appliance comprising: the cooking box comprises a box body shell and a cooking cavity arranged in the box body shell; the cooking device comprises a heat radiation fan, a variable frequency power supply, a magnetron and a control circuit board, wherein the heat radiation fan, the variable frequency power supply, the magnetron and the control circuit board are all arranged on the outer wall of the cooking cavity, a middle accommodating space is also arranged on the outer wall of the cooking cavity, the variable frequency power supply is provided with a power supply shell with two through sides, the magnetron is provided with a pipe shell with two through sides, an air outlet surface of the power supply shell and an air inlet surface of the pipe shell form an included angle, the control circuit board is placed in the middle accommodating space, the power supply shell and the pipe shell are adjacently arranged and are not crossed or partially crossed, one side of the power supply shell and one side of the pipe shell respectively form a first surrounding wall and a second surrounding wall of the middle accommodating space, and one part of an air outlet of the heat radiation fan is communicated with an air, the other part of the air outlet of the heat radiation fan is communicated with the middle accommodating space; and two ends of the first air guide piece are respectively communicated with the air outlet surface of the power supply shell and the air inlet surface of the tube shell correspondingly.

In the microwave cooking electric appliance, the first air flow shunted at the air outlet of the cooling fan sequentially flows through the power supply shell, the first air guide piece and the pipe shell, and the second air flow shunted at the air outlet of the cooling fan flows into the middle accommodating space. Therefore, three main heating components, namely the variable frequency power supply, the magnetron and the control circuit board, can be well radiated; only one cooling fan is needed, so that the cost is low; the structure is also very compact, thereby effectively reducing the volume of the whole machine or improving the capacity of the cooking cavity, and realizing the volume miniaturization.

In one embodiment, the box body shell comprises a bottom cover plate positioned at the bottom side of the cooking cavity, and the bottom cover plate and the bottom wall of the cooking cavity enclose an electric chamber; the heat radiation fan, the variable frequency power supply, the magnetron and the control circuit board are arranged in the electric chamber;

bottom air inlet mesh holes are formed in the bottom cover plate; the microwave cooking appliance further comprises an air inlet cover, one end of the air inlet cover is connected with the bottom cover plate and surrounds the bottom air inlet mesh, and the other end of the air inlet cover is connected with the heat dissipation fan and surrounds an air suction opening of the heat dissipation fan;

the air inlet cover is also provided with a first extension part, and the first extension part extends to the outer side of the air outlet of the heat radiation fan; the air outlet of the heat radiation fan is provided with a flow distribution plate, or the first extension part is provided with a flow distribution plate corresponding to the air outlet of the heat radiation fan; the flow distribution plate is used for distributing air from the air outlet of the cooling fan and respectively flowing into the power supply shell and the middle accommodating space.

In one embodiment, a second air guide member is arranged at an opening of one side of the power supply shell, which is far away from the first air guide member, the bottom cover plate comprises a bottom cover plate bottom wall and a bottom cover plate side wall, the bottom cover plate covers a part or all of the magnetron, a first air outlet mesh hole is arranged at a position, corresponding to the second air guide member, of the bottom cover plate side wall, and the second air guide member guides air coming out of the power supply shell to the bottom cover plate side wall;

the microwave cooking appliance also comprises a wind guide cover corresponding to the first wind outlet mesh, the tail part of the wind guide cover is covered on the tail part of the box body shell, and a second wind outlet mesh is arranged on the tail part of the wind guide cover; a water receiving box is arranged at the front end of the bottom of the box body shell;

a front opening with a downward opening is formed at the position adjacent to the front part of the air guide cover, the water receiving box and the bottom cover plate, the front opening is communicated with the inner space of the air guide cover, supporting legs are arranged at the position of the front opening, and the bottom ends of the supporting legs are lower than the bottom end of the bottom cover plate, which is adjacent to the position of the front opening, and lower than the bottom end of the water receiving box, which is adjacent to the position of the front opening;

and one part of the air coming out of the first air outlet mesh is discharged to the outside of the box body shell from the second air outlet mesh at the tail part of the air guide cover, and the other part of the air flows to the front side opening from the front part of the air guide cover and is discharged to the outside of the box body shell.

In one embodiment, the box body shell further comprises a rear cover plate arranged behind the cooking cavity, and the rear cover plate is connected with the bottom cover plate; a hot air assembly is arranged between the rear wall of the cooking cavity and the rear cover plate; the hot air assembly comprises a hot air cover with a cover opening facing the rear wall of the cooking cavity, a heating pipe and a hot air fan with metal blades which are positioned in the hot air cover, and a driving motor positioned on the rear side of the hot air cover; a third air guide piece is arranged between the hot air cover and the driving motor, the third air guide piece is provided with a groove, the driving motor is arranged in the groove, and an air inlet opening is formed in one side, close to the bottom cover plate, of the groove wall of the groove; a convex hull is arranged at the position, corresponding to the third air guide piece, of the rear cover plate, covers the third air guide piece, and fourth air outlet meshes communicated with the grooves are formed in the side edges of the convex hull; the bottom wall of the cooking cavity and the bottom cover plate are provided with first spacing areas, the rear wall of the cooking cavity and the rear cover plate are provided with second spacing areas, and the first spacing areas are communicated with the second spacing areas.

In one embodiment, an air outlet interval is formed between the air inlet end of the power supply housing and the air outlet end of the heat dissipation fan, and a part of the air discharged from the air outlet end of the heat dissipation fan flows into the second interval region through the air outlet interval.

In one embodiment, the bottom cover plate further comprises a tail wall, a concave portion is formed at one side of the tail wall adjacent to the second air outlet mesh hole, the concave portion comprises an air outlet surface facing the tail portion of the box shell and an air guide inclined surface adjacent to the air outlet surface, an included angle between the air outlet surface and the air guide inclined surface is larger than 90 degrees, a third air outlet mesh hole is formed in the air outlet surface, and the second air outlet mesh hole and the third air outlet mesh hole are arranged oppositely.

In one embodiment, the microwave cooking appliance further comprises a water storage box located on the front side below the bottom wall of the cooking cavity and a fixing box used for accommodating the water storage box, and a third surrounding wall of the middle accommodating space is formed at the tail of the fixing box.

In one embodiment, the middle accommodating space is also internally provided with a waveguide box, a microwave stirring motor and a water pump; the magnetron is placed horizontally, one side of the waveguide box is connected with one side of the magnetron for emitting microwaves, and the microwave stirring motor is connected below the waveguide box; a partition plate is arranged between the water pump and the microwave stirring motor, the microwave stirring motor is located above the partition plate, and the water pump is located below the partition plate.

In one embodiment, the variable frequency power supply further comprises a heat sink; the radiator comprises a plurality of radiating fins arranged at intervals, and the radiating fins are perpendicular to the air outlet face of the power supply shell.

In one embodiment, the air guide cover is provided with a concave handle part; the air inlet cover is further provided with a plate-shaped second extending portion, and the second extending portion covers the control circuit board.

Drawings

Fig. 1 is a view structural diagram of a microwave cooking appliance according to an embodiment of the invention;

fig. 2 is another perspective view of a microwave cooking device according to an embodiment of the invention;

fig. 3 is a schematic exploded view of an air guiding cover of the microwave cooking appliance according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a wind guiding cover and a bottom cover plate of the microwave cooking appliance according to an embodiment of the invention;

fig. 5 is an exploded view of a microwave cooking appliance according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a microwave cooking appliance according to an embodiment of the present invention with a bottom cover removed;

fig. 7 is a schematic structural view of a microwave cooking appliance according to an embodiment of the present invention with a bottom cover removed;

FIG. 8 is an enlarged schematic view of FIG. 7 at A;

fig. 9 is a view structural diagram of a microwave cooking appliance according to an embodiment of the present invention with a bottom cover removed;

fig. 10 is an exploded view of a microwave cooking appliance according to an embodiment of the present invention;

fig. 11 is an exploded view of a microwave cooking appliance according to an embodiment of the present invention;

fig. 12 is a schematic cross-sectional view of a microwave cooking appliance according to an embodiment of the invention.

Reference numerals:

10. a case body shell; 11. a bottom cover plate; 111. bottom air inlet mesh holes; 112. a bottom cover plate bottom wall; 113. a bottom cover plate side wall; 1131. a first air outlet mesh; 114. a trailing wall; 1141. an air outlet surface; 1142. an air guide inclined plane; 1143. a third air outlet mesh; 12. a rear cover plate; 121. a convex hull; 122. a fourth air outlet mesh; 13. a first spaced area; 14. a second spaced-apart region; 15. a side cover plate; 20. a cooking cavity; 30. a heat radiation fan; 31. air outlet interval; 40. a variable frequency power supply; 41. a heat sink; 50. a magnetron; 60. a control circuit board; 70. a first air guide member; 80. a door body; 91. a middle accommodating space; 92. an air inlet cover; 921. a first extension portion; 922. a flow distribution plate; 923. a second extension portion; 93. a second wind guide member; 94. a wind guide cover; 941. a second air outlet mesh; 942. a handle portion; 95. a water receiving box; 961. the front side is opened; 962. supporting legs; 98. a hot air assembly; 981. a hot air hood; 982. a heat generating tube; 983. a hot air fan; 984. a drive motor; 985. a third wind guide member; 986. a groove; 987. an air inlet opening; 99. a water storage box; 991. a fixing box; 992. a waveguide box; 993. a microwave stirring motor; 994. and (4) a water pump.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it should be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In one embodiment, referring to fig. 1 to 6, a microwave cooking appliance includes a box housing 10, a cooking cavity 20 disposed in the box housing 10, a heat dissipation fan 30, a variable frequency power supply 40, a magnetron 50, a control circuit board 60, and a first air guide 70.

Specifically, the microwave cooking appliance further includes a door 80. The box body shell 10 and the cooking cavity 20 are both provided with mouth parts corresponding to the door body 80, and the door body 80 can be covered on the mouth parts in an openable manner.

Referring to fig. 4 to 6, 9 and 10, the heat dissipation fan 30, the variable frequency power supply 40, the magnetron 50 and the control circuit board 60 are disposed on an outer wall of the cooking cavity 20, and a middle accommodating space 91 is further disposed on the outer wall of the cooking cavity 20.

Referring to fig. 4 to 6, 9 and 10, the variable frequency power supply 40 has a power supply housing with two through sides, the magnetron 50 has a tube housing with two through sides, and an air outlet surface of the power supply housing and an air inlet surface of the tube housing form an included angle (i.e. the two are arranged in a non-parallel manner). Specifically, the air outlet surface of the power supply shell is perpendicular to the air inlet surface of the pipe shell.

Referring to fig. 4 to 6, the control circuit board 60 is disposed in the middle accommodating space 91, the power supply housing and the tube housing are disposed adjacent to each other and do not intersect or partially intersect, and a first surrounding wall and a second surrounding wall of the middle accommodating space 91 are respectively formed on one side of the power supply housing and one side of the tube housing. One part of the air outlet of the heat dissipation fan 30 is communicated with the air inlet of the power supply housing, and the other part of the air outlet of the heat dissipation fan 30 is communicated with the middle accommodating space 91. The two ends of the first air guiding element 70 are respectively communicated with the air outlet surface of the power supply shell and the air inlet surface of the tube shell correspondingly. The first air guide 70 can guide the wind from the outlet surface of the power supply casing to the inlet surface of the pipe casing while turning.

In the microwave cooking appliance, the first air flow branched at the air outlet of the heat dissipation fan 30 sequentially flows through the power supply housing, the first air guide member 70 and the tube housing, and the second air flow branched at the air outlet of the heat dissipation fan 30 flows into the middle accommodating space 91. Therefore, the three main heating components of the variable frequency power supply 40, the magnetron 50 and the control circuit board 60 can be well radiated; only one cooling fan 30 is needed, so that the cost is low; the structure is compact, thereby effectively reducing the volume of the whole machine or improving the capacity of the cooking cavity 20, and realizing the volume miniaturization.

Further, referring to fig. 4 to 6, the box housing 10 includes a bottom cover plate 11 located at a bottom side of the cooking cavity 20. The bottom cover plate 11 and the bottom wall of the cooking cavity 20 enclose an electric room. The heat dissipation fan 30, the variable frequency power source 40, the magnetron 50, and the control circuit board 60 are disposed in the electric chamber. Specifically, the middle accommodating space 91 is located in the electric chamber.

In addition, referring to fig. 3 to 6, the bottom cover plate 11 is provided with bottom air inlet mesh holes 111. The microwave cooking appliance further comprises an air inlet cover 92, one end of the air inlet cover 92 is connected with the bottom cover plate 11 and surrounds the bottom air inlet mesh 111, and the other end of the air inlet cover 92 is connected with the heat dissipation fan 30 and surrounds an air inlet of the heat dissipation fan 30. The air inlet cover 92 is further provided with a first extending portion 921, and the first extending portion 921 extends to the outer side of the air outlet of the heat dissipation fan 30. The air outlet of the heat dissipation fan 30 is provided with a flow distribution plate 922, or the first extension part 921 is provided with a flow distribution plate 922 corresponding to the air outlet of the heat dissipation fan 30. The flow dividing plate 922 is used for dividing the air from the air outlet of the heat dissipation fan 30 and allowing the air to flow into the power supply housing and the middle accommodating space 91 respectively. Therefore, the air flow can be effectively distributed, so that the air coming out of the air outlet of the cooling fan 30 is divided and guided into the power supply shell and the middle accommodating space 91 respectively. When the flow dividing plate 922 is disposed on the air inlet cover 92, the structure of the original fan is not changed, and thus the cost is not increased due to the redesign of the heat dissipation fan 30.

Further, referring to fig. 4 to 6, a second air guide 93 is disposed at an opening of the power supply housing at a side away from the first air guide 70. The bottom cover plate 11 comprises a bottom cover plate bottom wall 112 and a bottom cover plate side wall 113, the bottom cover plate 11 covers a part or all of the magnetron 50, a first air outlet hole 1131 is formed in a position, corresponding to the second air guide 93, of the bottom cover plate side wall 113, and the second air guide 93 guides air coming out of the power supply shell to the bottom cover plate side wall 113.

In addition, the microwave cooking appliance further includes an air guiding cover 94 corresponding to the first air outlet holes 1131, a tail portion of the air guiding cover 94 is covered on the tail portion of the box body casing 10, and second air outlet holes 941 are arranged on the tail portion of the air guiding cover 94. The front end of the bottom of the box body shell 10 is provided with a water receiving box 95. The water receiving box 95 is mainly used for receiving condensed water flowing out of the cooking cavity 20.

In addition, a front opening 961 that opens downward is formed in the front of the air guiding cover 94, in the vicinity of the water receiving box 95 and the bottom cover plate 11. The front opening 961 is communicated with the inner space of the air guiding cover 94, and a supporting leg 962 is provided at the front opening 961. The bottom ends of the supporting legs 962 are lower than the bottom end of the bottom cover plate 11 adjacent to the front opening 961, and lower than the bottom end of the water receiving box 95 adjacent to the front opening 961. In this way, the support legs 962 contact the table top to form a ventilation gap between the bottom cover plate 11 and the table top, so that the wind in the wind guiding cover 94 can be discharged from the front opening 961.

A part of the wind from the first wind outlet holes 1131 is discharged to the outside of the box casing 10 through the second wind outlet holes 941 at the rear of the wind guide cover 94, and another part of the wind flows from the front of the wind guide cover 94 to the front opening 961 and is discharged to the outside of the box casing 10. Therefore, firstly, because the wind with heat coming out of the magnetron 50 is blown to the side cover plate 15 of the box body shell 10 through the second wind guide member 93, and the gap between the side cover plate 15 and the second wind guide member 93 is too small, when the wind is blown to the tail part direction of the box body shell 10, the wind flow is blocked, the radiating wind flow is influenced to be discharged quickly and smoothly, the front side opening 961 is added, so that a part of the wind coming out of the second wind guide member 93 is guided to the front side opening 961 from the front end of the wind guide cover 94 and is discharged to the outside of the box body shell 10, and the air exhaust can be performed smoothly and quickly; an independent air duct separated from the internal space of the bottom cover plate 11 is formed between the air guiding cover 94 and the side wall 113 of the bottom cover plate, so that air flow can be prevented from rotating in the bottom cover plate 11, and the heat dissipation air flow can be smoothly guided out of the box body shell 10; thirdly, the air guide cover 94 can be removed according to the use environment condition, so as to further increase the speed of discharging the air from the second air guide member 93 to the outside of the box body shell 10, for example, when the weather becomes hot or the space for placing the microwave cooking appliance is relatively closed; or the air guiding cover 94 is removed to adjust the air exhausting direction, for example, the rear part of the microwave cooking appliance placing space is closed, and two sides are opened.

It should be noted that the front portion of the air guiding cover 94 refers to a portion of the air guiding cover 94 close to the door 80, and the rear portion of the air guiding cover 94 refers to a portion of the air guiding cover 94 close to the rear cover 12 of the box casing 10. Further, specifically, the rear portion of the cabinet case 10 refers to the rear cover 12 of the cabinet case 10. The bottom of the case housing 10 is referred to as a bottom cover plate 11 of the case housing 10.

Further, referring to fig. 9 to 12, a rear cover plate 12 is disposed behind the cooking cavity 20, and a hot air assembly 98 is disposed between the rear wall of the cooking cavity 20 and the rear cover plate 12. The hot air assembly 98 includes a hot air hood 981 with a hood opening facing the rear wall of the cooking cavity 20, a heating pipe 982 and a hot air fan 983 with metal blades located in the hot air hood 981, and a driving motor 984 located at the rear side of the hot air hood 981. A third air guide piece 985 is arranged between the hot air cover 981 and the driving motor 984, a groove 986 is formed in the third air guide piece 985, the driving motor 984 is arranged in the groove 986, and an air inlet opening 987 is formed in one side, close to the bottom cover plate 11, of the groove wall of the groove 986. A convex hull 121 is arranged at a position of the rear cover plate 12 corresponding to the third wind guide member 985, the convex hull 121 covers the third wind guide member 985, and a fourth air outlet mesh 122 communicated with the groove 986 is arranged on a side edge of the convex hull 121. A first interval region 13 is formed between the bottom wall of the cooking cavity 20 and the bottom cover plate 11, a second interval region 14 is formed between the rear wall of the cooking cavity 20 and the rear cover plate 12, and the first interval region 13 is communicated with the second interval region 14. In this way, a part of the air from the second wind guide 93 blows into the second partition area 14 from bottom to top, blows into the groove 986 from the air inlet of the third wind guide 985, and is discharged to the outside of the box casing 10 from the fourth air outlet holes 122, so as to dissipate heat of the driving motor 984 of the hot air assembly 98.

Further, referring to fig. 4, 10 and 12, an air outlet interval 31 is formed between the air inlet end of the power supply housing and the air outlet end of the heat dissipation fan 30, and a part of the air discharged from the air outlet end of the heat dissipation fan 30 flows into the second interval region 14 through the air outlet interval 31. Therefore, after a part of the air discharged from the air outlet end of the cooling fan 30 flows into the second interval region 14 through the air outlet interval 31, the part of the air further flows into the groove 986 of the third air guide member 985 of the hot air assembly 98, so as to cool the hot air assembly 98, and the cooling effect is good.

Further, referring to fig. 3, the bottom cover plate 11 further includes a tail wall 114. The tail wall 114 is adjacent to one side of the second air outlet mesh 941 forms a concave portion, the concave portion includes towards the air outlet face 1141 of the tail portion of the box housing 10 and the air guide inclined plane 1142 adjacent to the air outlet face 1141, the air outlet face 1141 and the included angle of the air guide inclined plane 1142 is greater than 90 degrees, the air outlet face 1141 is provided with a third air outlet mesh 1143, and the second air outlet mesh 941 and the third air outlet mesh 1143 are arranged oppositely. Thus, a part of the wind coming out of the first wind outlet holes 1131 flows to the third wind outlet holes 1143 along the side wall of the bottom cover plate 11, and flows to the outside of the box body through the second wind outlet holes 941. The air guiding inclined surface 1142 can make the air in the air guiding cover 94 transmitted to the second air outlet holes 941 reflect toward the second air outlet holes 941 and flow into the second air outlet holes 941, so that the air does not flow back into the bottom cover plate 11 through the second air outlet holes 941.

Further, referring to fig. 4 to 6, the microwave cooking appliance further includes a water storage box 99 located at the front side below the bottom wall of the cooking cavity 20 and a fixing box 991 for accommodating the water storage box 99. The tail of the fixed box 991 forms a third wall of the middle accommodating space 91. Wherein the water in the water storage box 99 is used for being transferred to the evaporator through a pipe for the evaporator to generate steam. Thus, the heat of the middle accommodating space 91 can be transferred to the cold water in the water storage box 99, and the cold water can be assisted to be preheated, so that the energy efficiency is improved; meanwhile, the cold water may absorb heat of the middle receiving space 91 in a conduction manner to dissipate heat of the control circuit board 60.

Further, referring to fig. 4 to 6, a waveguide box 992, a microwave stirring motor 993 and a water pump 994 are further disposed in the middle accommodating space 91. Specifically, the waveguide box 992 serves to transmit the microwaves emitted from the magnetron 50 into the cooking cavity 20. The magnetron 50 is placed horizontally, one side of the waveguide box 992 is connected with one side of the magnetron 50 emitting microwaves, and the microwave stirring motor 993 is connected below the waveguide box 992. The water pump 994 with be equipped with the baffle between the microwave stirring motor 993, microwave stirring motor 993 is located the baffle top, the water pump 994 is located the baffle below. Thus, the structure is compact, and the volume can be miniaturized.

Further, referring to fig. 7 and 8, the variable frequency power supply 40 further includes a heat sink 41. The heat sink 41 includes a plurality of heat dissipation fins arranged at intervals, and the heat dissipation fins are arranged perpendicular to the air outlet surface of the power supply housing. In this way, the wind flow can directly pass through the space between the adjacent fins, thereby improving the heat dissipation effect of the heat sink 41 of the variable frequency power supply 40.

Further, referring to fig. 5, the wind guiding cover 94 is provided with a recessed handle portion 942. Thus, the microwave cooking appliance can be conveniently carried by the handle part 942.

In addition, referring to fig. 6, the air inlet cover 92 is further provided with a second plate-shaped extending portion 923, and the second extending portion 923 covers the control circuit board 60.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A microwave cooking appliance, comprising:

the cooking box comprises a box body shell and a cooking cavity arranged in the box body shell;

the cooking device comprises a heat radiation fan, a variable frequency power supply, a magnetron and a control circuit board, wherein the heat radiation fan, the variable frequency power supply, the magnetron and the control circuit board are all arranged on the outer wall of the cooking cavity, a middle accommodating space is also arranged on the outer wall of the cooking cavity, the variable frequency power supply is provided with a power supply shell with two through sides, the magnetron is provided with a pipe shell with two through sides, an air outlet surface of the power supply shell and an air inlet surface of the pipe shell form an included angle, the control circuit board is placed in the middle accommodating space, the power supply shell and the pipe shell are adjacently arranged and are not crossed or partially crossed, one side of the power supply shell and one side of the pipe shell respectively form a first surrounding wall and a second surrounding wall of the middle accommodating space, and one part of an air outlet of the heat radiation fan is communicated with an air, the other part of the air outlet of the heat radiation fan is communicated with the middle accommodating space; and

and two ends of the first air guide piece are respectively communicated with the air outlet surface of the power supply shell and the air inlet surface of the tube shell correspondingly.

2. The microwave cooking appliance of claim 1 wherein the cabinet housing includes a bottom cover plate on a bottom side of the cooking cavity, the bottom cover plate and the bottom wall of the cooking cavity enclosing an electrical chamber; the heat radiation fan, the variable frequency power supply, the magnetron and the control circuit board are arranged in the electric chamber;

3. The microwave cooking appliance according to claim 2, wherein a second wind guide is provided at an opening of a side of the power supply housing away from the first wind guide, the bottom cover includes a bottom cover bottom wall and a bottom cover side wall, the bottom cover covers a part or all of the magnetron, a first air outlet hole is provided at a position of the bottom cover side wall corresponding to the second wind guide, and the second wind guide guides the wind coming out of the power supply housing to the bottom cover side wall;

4. The microwave cooking appliance of claim 3, wherein the cabinet housing further comprises a back cover plate disposed behind the cooking cavity, the back cover plate being connected to the bottom cover plate; a hot air assembly is arranged between the rear wall of the cooking cavity and the rear cover plate; the hot air assembly comprises a hot air cover with a cover opening facing the rear wall of the cooking cavity, a heating pipe and a hot air fan with metal blades which are positioned in the hot air cover, and a driving motor positioned on the rear side of the hot air cover; a third air guide piece is arranged between the hot air cover and the driving motor, the third air guide piece is provided with a groove, the driving motor is arranged in the groove, and an air inlet opening is formed in one side, close to the bottom cover plate, of the groove wall of the groove; a convex hull is arranged at the position, corresponding to the third air guide piece, of the rear cover plate, covers the third air guide piece, and fourth air outlet meshes communicated with the grooves are formed in the side edges of the convex hull; the bottom wall of the cooking cavity and the bottom cover plate are provided with first spacing areas, the rear wall of the cooking cavity and the rear cover plate are provided with second spacing areas, and the first spacing areas are communicated with the second spacing areas.

5. The microwave cooking appliance according to claim 4, wherein an air outlet interval is formed between the air inlet end of the power supply housing and the air outlet end of the heat dissipation fan, and a part of the air discharged from the air outlet end of the heat dissipation fan flows into the second interval region through the air outlet interval.

6. The microwave cooking appliance according to claim 3, wherein the bottom cover plate further includes a tail wall, a concave portion is formed on a side of the tail wall adjacent to the second air outlet hole, the concave portion includes an air outlet surface facing a tail portion of the box casing and an air guide inclined surface adjacent to the air outlet surface, an included angle between the air outlet surface and the air guide inclined surface is greater than 90 degrees, a third air outlet hole is formed in the air outlet surface, and the second air outlet hole and the third air outlet hole are arranged oppositely.

7. The microwave cooking appliance according to claim 3, further comprising a water storage box located at the front side below the bottom wall of the cooking cavity and a fixing box for accommodating the water storage box, wherein the tail part of the fixing box forms a third enclosure wall of the middle accommodating space.

8. The microwave cooking appliance according to claim 3, wherein a waveguide box, a microwave stirring motor and a water pump are further arranged in the middle accommodating space; the magnetron is placed horizontally, one side of the waveguide box is connected with one side of the magnetron for emitting microwaves, and the microwave stirring motor is connected below the waveguide box; a partition plate is arranged between the water pump and the microwave stirring motor, the microwave stirring motor is located above the partition plate, and the water pump is located below the partition plate.

9. The microwave cooking appliance of claim 3, wherein the variable frequency power supply further comprises a heat sink; the radiator comprises a plurality of radiating fins arranged at intervals, and the radiating fins are perpendicular to the air outlet face of the power supply shell.

10. The microwave cooking appliance according to any one of claims 3 to 9, wherein the air guiding cover is provided with a recessed handle portion; the air inlet cover is further provided with a plate-shaped second extending portion, and the second extending portion covers the control circuit board.