CN111059582B

CN111059582B - Microwave cooking appliance

Info

Publication number: CN111059582B
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: 2024-07-05
Anticipated expiration: 2039-12-26
Also published as: CN111059582A

Abstract

The invention relates to a microwave cooking appliance which comprises a box shell, a cooking cavity arranged in the box 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 of the air outlet of the cooling fan flows through the power supply shell, the first air guide piece and the pipe shell in sequence, and the second air flow of 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 miniaturization of the volume.

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 is an appliance with a microwave cooking function, such as a microwave oven, a microwave steam box and a micro-steaming and baking three-in-one product. When the microwave cooking appliance has more than two functions of micro, steaming and baking, corresponding heating function devices are required to be arranged inside the microwave cooking appliance. However, arranging the corresponding heating function devices will put high demands on compact layout and omnibearing heat dissipation of the product, especially on some small-sized microwave cooking appliances, and the arrangement difficulty is high.

Disclosure of Invention

Based on the above, 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 miniaturization.

The technical scheme is as follows: a microwave cooking appliance, comprising: a case housing and a cooking cavity disposed in the case housing; the cooling 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 further formed 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 tube shell with two through sides, an air outlet surface of the power supply shell and an air inlet surface of the tube shell form an included angle, the control circuit board is arranged in the middle accommodating space, the power supply shell and the tube shell are adjacently arranged and do not cross or partially cross, a first enclosing wall and a second enclosing wall of the middle accommodating space are respectively formed on one side of the power supply shell and one side of the tube shell, one part of an air outlet of the cooling fan is communicated with the air inlet of the power supply shell, and the other part of the air outlet of the cooling fan is communicated with the middle accommodating space; and two ends of the first air guide piece are correspondingly communicated with the air outlet surface of the power supply shell and the air inlet surface of the pipe shell respectively.

According to the microwave cooking electric appliance, the first air flow split 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 split at the air outlet of the cooling fan flows into the middle accommodating space. Therefore, 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 miniaturization of the volume.

In one embodiment, the case housing includes a bottom cover plate located at a bottom side of the cooking cavity, the bottom cover plate and a bottom wall of the cooking cavity enclosing an electric chamber; the radiating fan, the variable-frequency power supply, the magnetron and the control circuit board are arranged in the electric room;

the bottom cover plate is provided with bottom air inlet meshes; 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 cooling fan and surrounds an air suction inlet of the cooling fan;

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

In one embodiment, a second air guide member is arranged at an opening at 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 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 further comprises an air guide cover corresponding to the first air outlet mesh, wherein the tail part of the air guide cover is arranged on the tail part of the box body shell, and a second air outlet mesh is arranged on the tail part of the air guide cover; the front end of the bottom of the box body shell is provided with a water receiving box;

The front part of the air guide cover, the water receiving box and the bottom cover plate are adjacent to each other to form a front side opening with a downward opening, the front side opening is communicated with the inner space of the air guide cover, supporting feet are arranged at the front side opening, and the bottom ends of the supporting feet are lower than the bottom ends of the bottom cover plate, which are adjacent to the front side opening, and lower than the bottom ends of the water receiving box, which are adjacent to the front side opening;

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

In one embodiment, the case housing further includes a back cover plate disposed at a rear of the cooking cavity, the back cover plate being connected to the bottom cover plate; a hot air component 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 at 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 one side of the groove wall of the groove, which is close to the bottom cover plate, is provided with an air inlet opening; the rear cover plate is provided with a convex hull corresponding to the third air guide piece, the convex hull covers the third air guide piece, and the side edge of the convex hull is provided with a fourth air outlet mesh communicated with the groove; the bottom wall of the cooking cavity and the bottom cover plate form a first interval area, the rear wall of the cooking cavity and the rear cover plate form a second interval area, and the first interval area is communicated with the second interval area.

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

In one embodiment, the bottom cover plate further includes a tail wall, a recess is formed on one side of the tail wall adjacent to the second air outlet mesh, the recess includes an air outlet face facing the tail of the case housing and an air guiding inclined plane adjacent to the air outlet face, an included angle between the air outlet face and the air guiding inclined plane is greater than 90 degrees, a third air outlet mesh is disposed on the air outlet face, and the second air outlet mesh and the third air outlet mesh are disposed opposite to each other.

In one embodiment, the microwave cooking appliance further comprises a water storage box and a fixing box, wherein the water storage box is positioned at the front side below the bottom wall of the cooking cavity, the fixing box is used for accommodating the water storage box, and the tail part of the fixing box forms a third enclosing wall of the middle accommodating space.

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 positioned above the partition plate, and the water pump is positioned 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 which are 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 also provided with a platy second extension part, and the control circuit board is covered by the second extension part.

Drawings

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

fig. 2 is a view illustrating another view angle structure of a microwave cooking appliance according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a microwave cooking appliance with a wind guiding cover separated according to an embodiment of the invention;

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

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

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

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

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

Fig. 9 is a view of a structure of a microwave cooking appliance with a bottom cover plate removed according to an embodiment of the present invention;

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 housing; 11. a bottom cover plate; 111. bottom air inlet mesh openings; 112. a bottom cover plate bottom wall; 113. a bottom cover plate side wall; 1131. a first air outlet mesh; 114. a tail wall; 1141. an air outlet surface; 1142. an air guiding inclined plane; 1143. third air outlet mesh openings; 12. a back cover plate; 121. convex hulls; 122. fourth air outlet mesh openings; 13. a first spacing region; 14. a second spacing region; 15. a side cover plate; 20. a cooking cavity; 30. a heat radiation fan; 31. an 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; 80. a door body; 91. a middle accommodating space; 92. an air inlet cover; 921. a first extension; 922. a diverter plate; 923. a second extension; 93. a second air guide; 94. an air guide cover; 941. a second air outlet mesh; 942. a handle portion; 95. a water receiving box; 961. a front side opening; 962. supporting feet; 98. a hot air assembly; 981. a hot air cover; 982. a heating tube; 983. a hot air fan; 984. a driving motor; 985. a third air guide; 986. a groove; 987. an air inlet opening; 99. a water storage box; 991. a fixed box; 992. a waveguide box; 993. a microwave stirring motor; 994. and (3) a water pump.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should 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 a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the description of the present invention, it will 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 cabinet housing 10, a cooking cavity 20 disposed in the cabinet housing 10, a cooling 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 body 80. The case housing 10 and the cooking cavity 20 are each provided with a mouth portion corresponding to the door 80, and the door 80 is openably covered on the mouth portion.

Referring to fig. 4 to 6, 9 and 10, the cooling fan 30, the variable frequency power supply 40, the magnetron 50 and the control circuit board 60 are disposed on the 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 is provided with a power supply housing with two through sides, the magnetron 50 is provided with 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 are disposed at an included angle (i.e. are disposed in non-parallel). Specifically, the air outlet surface of the power supply housing is perpendicular to the air inlet surface of the pipe housing.

Referring to fig. 4 to 6, the control circuit board 60 is disposed in the middle accommodating space 91, the power supply housing is disposed adjacent to the tube housing and does not intersect or partially intersect, and a side of the power supply housing and a side of the tube housing form a first enclosure wall and a second enclosure wall of the middle accommodating space 91, respectively. A part of the air outlet of the cooling fan 30 is communicated with the air inlet of the power supply housing, and another part of the air outlet of the cooling fan 30 is communicated with the middle accommodating space 91. The two ends of the first air guide member 70 are respectively communicated with the air outlet surface of the power supply housing and the air inlet surface of the pipe housing. The first wind guide 70 can guide wind turns of the wind outlet face of the power supply housing to the wind inlet face of the pipe housing.

In the above microwave cooking apparatus, the first air flow split at the air outlet of the cooling fan 30 flows through the power supply housing, the first air guide 70 and the pipe housing in sequence, and the second air flow split at the air outlet of the cooling fan 30 flows into the middle accommodating space 91. Thus, three main heating components of the variable frequency power supply 40, the magnetron 50 and the control circuit board 60 can be well radiated; and 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 miniaturization of the volume.

Further, referring to fig. 4 to 6, the case housing 10 includes a bottom cover plate 11 positioned 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 chamber. The heat radiation fan 30, the variable frequency power supply 40, the magnetron 50, and the control circuit board 60 are disposed in the electric room. Specifically, the middle accommodating space 91 is located in the electric room.

In addition, referring to fig. 3 to 6, the bottom cover plate 11 is provided with a bottom air inlet mesh 111. The microwave cooking appliance further comprises an air inlet cover 92, wherein one end of the air inlet cover 92 is connected with the bottom cover plate 11 and encloses the bottom air inlet mesh 111, and the other end is connected with the cooling fan 30 and encloses the air suction inlet of the cooling fan 30. The air inlet cover 92 is further provided with a first extension 921, and the first extension 921 extends to the outside of the air outlet of the cooling fan 30. The air outlet of the cooling fan 30 is provided with a flow dividing plate 922, or the first extension 921 is provided with a flow dividing plate 922 corresponding to the air outlet of the cooling fan 30. The splitter plate 922 is configured to split the air from the air outlet of the cooling fan 30 and flow into the power supply housing and the middle accommodating space 91, respectively. In this way, the wind flow can be effectively distributed, so that the wind from the air outlet of the cooling fan 30 is split and guided into the power supply housing and the middle accommodating space 91, respectively. When the splitter plate 922 is disposed on the air intake cover 92, the original fan structure is not changed, so that the cost is not increased due to redesign of the heat dissipation fan 30.

Further, referring to fig. 4 to 6, a second air guiding member 93 is disposed at an opening of the power supply housing at a side far from the first air guiding member 70. The bottom cover plate 11 includes a bottom cover plate bottom wall 112 and a bottom cover plate side wall 113, the bottom cover plate 11 encloses a part or all of the magnetron 50, a first air outlet mesh 1131 is provided at a position of the bottom cover plate side wall 113 corresponding to the second air guide 93, and the second air guide 93 guides air coming out of the power supply housing to the bottom cover plate side wall 113.

In addition, the microwave cooking appliance further comprises an air guide cover 94 corresponding to the first air outlet mesh 1131, the tail part of the air guide cover 94 is covered on the tail part of the box body shell 10, and a second air outlet mesh 941 is arranged on the tail part of the air guide 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 is formed at the vicinity of the front portion of the air guide cover 94, the water receiving box 95, and the bottom cover plate 11, which is opened downward. The front opening 961 communicates 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 support legs 962 are lower than the bottom ends of the bottom cover plate 11 adjacent to the front side openings 961 and lower than the bottom ends of the water receiving boxes 95 adjacent to the front side openings 961. In this manner, the support legs 962 contact the countertop such that the bottom cover panel 11 forms a ventilation gap with the countertop such that wind within the wind-guiding cover 94 can be discharged outwardly from the front side opening 961.

A part of the wind from the first wind outlet holes 1131 is discharged to the outside of the box housing 10 from the second wind outlet holes 941 at the tail of the wind guiding cover 94, and the other part flows from the front of the wind guiding cover 94 to the front opening 961 and is discharged to the outside of the box housing 10. In this way, firstly, the air with heat from the magnetron 50 is blown to the side cover 15 of the box body outer shell 10 through the second air guide member 93, and when the gap between the side cover 15 and the second air guide member 93 is too small and all the air is blown to the tail direction of the box body outer shell 10, the air flow is blocked, the heat dissipation air flow is influenced to be quickly and smoothly discharged, the front side opening 961 is increased, and part of the air from the second air guide member 93 is led to the front side opening 961 from the front end of the air guide cover 94 and discharged to the outside of the box body outer shell 10, so that the air discharge can be smooth and rapid; 2. an independent air channel separated from the inner space of the bottom cover plate 11 is formed between the air guide cover 94 and the side wall 113 of the bottom cover plate, so that the air flow can be prevented from rotating in the bottom cover plate 11, and the heat dissipation air flow is smoothly led out to the outside of the box body shell 10; 3. the air guide cover 94 can be removed according to the use environment, so as to further increase the speed of discharging the air from the second air guide member 93 to the outside of the case body 10, for example, under the condition that the weather becomes hot or the space where the microwave cooking appliance is placed is relatively closed; or the air exhaust direction is adjusted by removing the air guide cover 94, for example, the rear of the placing space of the microwave cooking appliance is closed, and the two sides are open.

The front portion of the air guiding cover 94 refers to a portion of the air guiding cover 94 near the door 80, and the rear portion of the air guiding cover 94 refers to a portion of the air guiding cover 94 near the back cover 12 of the box housing 10. In addition, specifically, the rear portion of the box housing 10 refers to the rear cover 12 of the box housing 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 at the rear of 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 having a hood opening facing the rear wall of the cooking cavity 20, a heat pipe 982 and a hot air fan 983 with metal blades positioned in the hot air hood 981, and a driving motor 984 positioned at the rear side of the hot air hood 981. A third air guide member 985 is arranged between the hot air cover 981 and the driving motor 984, the third air guide member 985 is provided with a groove 986, the driving motor 984 is arranged in the groove 986, and one side of the groove wall of the groove 986, which is close to the bottom cover plate 11, is provided with an air inlet opening 987. The rear cover plate 12 is provided with a convex hull 121 corresponding to the third air guiding member 985, the convex hull 121 covers the third air guiding member 985, and a fourth air outlet mesh 122 communicated with the groove 986 is arranged on the side edge of the convex hull 121. The bottom wall of the cooking cavity 20 and the bottom cover plate 11 are formed with a first interval region 13, the rear wall of the cooking cavity 20 and the rear cover plate 12 are formed with a second interval region 14, and the first interval region 13 communicates with the second interval region 14. In this way, a part of the air from the second air guiding member 93 is blown into the second space region 14 from bottom to top, and is blown into the groove 986 from the air inlet of the third air guiding member 985, and is discharged from the fourth air outlet mesh 122 to the outside of the box housing 10, so as to dissipate heat from the driving motor 984 of the hot air assembly 98.

Further, referring to fig. 4, 10 and 12, an air outlet gap 31 is formed between the air inlet end of the power supply housing and the air outlet end of the cooling fan 30, and 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 gap 31. In this way, after a part of the air exhausted from the air outlet end of the cooling fan 30 flows into the second interval area 14 through the air outlet interval 31, the air 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 better.

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 to form a recess, the recess includes an air outlet surface 1141 facing the tail of the box casing 10 and an air guiding inclined surface 1142 adjacent to the air outlet surface 1141, an included angle between the air outlet surface 1141 and the air guiding inclined surface 1142 is greater than 90 degrees, a third air outlet mesh 1143 is disposed on the air outlet surface 1141, and the second air outlet mesh 941 and the third air outlet mesh 1143 are disposed opposite to each other. Thus, a portion of the wind exiting the first wind outlet holes 1131 flows along the sidewall of the bottom cover 11 to the third wind outlet holes 1143, and flows to the outside of the case through the second wind outlet holes 941. The air guiding slope 1142 may reflect the air in the air guiding cover 94 toward the second air outlet mesh 941, and flow into the second air outlet mesh 941, so that the air does not flow back into the bottom cover 11 from the second air outlet mesh 941.

Further, referring to fig. 4 to 6, the microwave cooking appliance further includes a water storage box 99 positioned at a lower front side of the bottom wall of the cooking cavity 20 and a fixing box 991 for accommodating the water storage box 99. The rear portion of the fixing case 991 forms a third peripheral wall of the middle accommodating space 91. Wherein, the water in the water storage box 99 is used for being transmitted to the evaporator through a pipeline for the evaporator to generate steam. Thus, the heat of the middle accommodating space 91 can be conducted into the cold water in the water storage box 99, and the cold water can be preheated in an auxiliary manner so as to improve the energy efficiency; meanwhile, the cold water may absorb heat of the middle receiving space 91 in a conductive manner to radiate 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 microwaves emitted from the magnetron 50 into the cooking cavity 20. The magnetron 50 is placed upside down, 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. A partition plate is arranged between the water pump 994 and the microwave stirring motor 993, the microwave stirring motor 993 is positioned above the partition plate, and the water pump 994 is positioned below the partition plate. Therefore, the structure is compact, and the volume is 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 sinks arranged at intervals, and the heat sinks 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 cooling fins, thereby improving the heat dissipation effect of the radiator 41 of the variable frequency power supply 40.

Further, referring to fig. 5, the air guiding cover 94 is provided with a recessed handle 942. In this way, the microwave cooking appliance can be conveniently carried by the handle 942.

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

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A microwave cooking appliance, comprising:

A case housing and a cooking cavity disposed in the case housing;

The cooling 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 further formed 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 tube shell with two through sides, an air outlet surface of the power supply shell and an air inlet surface of the tube shell form an included angle, the control circuit board is arranged in the middle accommodating space, the power supply shell and the tube shell are adjacently arranged and do not cross or partially cross, a first enclosing wall and a second enclosing wall of the middle accommodating space are respectively formed on one side of the power supply shell and one side of the tube shell, one part of an air outlet of the cooling fan is communicated with the air inlet of the power supply shell, and the other part of the air outlet of the cooling fan is communicated with the middle accommodating space; and

The two ends of the first air guide piece are correspondingly communicated with the air outlet surface of the power supply shell and the air inlet surface of the pipe shell respectively; 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 radiating fan, the variable-frequency power supply, the magnetron and the control circuit board are arranged in the electric room;

The air inlet cover is also provided with a first extension part which extends to the outer side of the air outlet of the cooling fan; the air outlet of the cooling fan is provided with a flow dividing plate, or the first extension part is provided with a flow dividing plate corresponding to the air outlet of the cooling fan; the flow dividing plate is used for dividing the wind from the air outlet of the cooling fan and respectively flowing into the power supply shell and the middle accommodating space; the power supply shell is provided with a first air guide piece at the opening part of one side far away from the first air guide piece, the bottom cover plate comprises a bottom cover plate bottom wall and a bottom cover plate side wall, the bottom cover plate covers part or all of the magnetron, the position of the bottom cover plate side wall corresponding to the first air guide piece is provided with a first air outlet mesh, and the second air guide piece guides air coming out of the power supply shell to the bottom cover plate side wall;

One part of the wind from the first wind outlet mesh is discharged to the outside of the box body shell from the second wind outlet mesh at the tail part of the wind guide cover, and the other part of the wind from the front part of the wind guide cover flows to the front side opening and is discharged to the outside of the box body shell; the box body shell further comprises a rear cover plate arranged at the rear of the cooking cavity, and the rear cover plate is connected with the bottom cover plate; a hot air component 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 at 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 one side of the groove wall of the groove, which is close to the bottom cover plate, is provided with an air inlet opening; the rear cover plate is provided with a convex hull corresponding to the third air guide piece, the convex hull covers the third air guide piece, and the side edge of the convex hull is provided with a fourth air outlet mesh communicated with the groove; a first interval area is formed between the bottom wall of the cooking cavity and the bottom cover plate, a second interval area is formed between the rear wall of the cooking cavity and the rear cover plate, and the first interval area is communicated with the second interval area; the cooking device further comprises a water storage box and a fixed box, wherein the water storage box is positioned at the front side below the bottom wall of the cooking cavity, the fixed box is used for accommodating the water storage box, and the tail part of the fixed box forms a third enclosing wall of the middle accommodating space.

2. The microwave cooking appliance of claim 1 wherein the air outlet face of the power supply housing is perpendicular to the air inlet face of the tube housing.

3. The microwave cooking appliance of claim 1, further comprising a door; the box body shell and the cooking cavity are both provided with a mouth corresponding to the door body, and the door body is openably covered on the mouth.

4. A microwave cooking appliance according to claim 3 wherein the front portion of the air guiding cover is a portion of the air guiding cover close to the door body, and the rear portion of the air guiding cover is a portion of the air guiding cover close to the rear cover plate of the case housing.

5. The microwave cooking appliance of claim 1, wherein the central receiving space is located within the electrical chamber.

6. The microwave cooking appliance of claim 1, wherein an air outlet space is formed between an air inlet end of the power supply housing and an air outlet end of the cooling fan, and a portion of air discharged from the air outlet end of the cooling fan flows into the second interval region through the air outlet space.

7. The microwave cooking appliance of claim 1, wherein the bottom cover plate further comprises a tail wall, a recess is formed on one side of the tail wall adjacent to the second air outlet mesh, the recess comprises an air outlet face facing the tail of the box body shell and an air guiding inclined face adjacent to the air outlet face, an included angle between the air outlet face and the air guiding inclined face is greater than 90 degrees, a third air outlet mesh is arranged on the air outlet face, and the second air outlet mesh and the third air outlet mesh are oppositely arranged.

8. The microwave cooking appliance according to claim 1, 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 positioned above the partition plate, and the water pump is positioned below the partition plate.

9. The microwave cooking appliance of claim 1, wherein the variable frequency power supply further comprises a heat sink; the radiator comprises a plurality of radiating fins which are 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 1 to 9, wherein the air guide cover is provided with a recessed handle portion; the air inlet cover is also provided with a platy second extension part, and the control circuit board is covered by the second extension part.