CN109619999B

CN109619999B - Microwave oven

Info

Publication number: CN109619999B
Application number: CN201811464153.6A
Authority: CN
Inventors: 韩大成
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-11-27
Anticipated expiration: 2038-11-30
Also published as: CN109619999A

Abstract

The invention discloses a microwave oven, which comprises a shell, a first flow jet plate and a second flow jet plate, wherein the shell is provided with a first flow jet plate and a second flow jet plate; a heating chamber is arranged in the shell, a first jet cavity is arranged above the heating chamber, and a second jet cavity is arranged below the heating chamber; the first jet flow plate is arranged between the heating chamber and the first jet flow cavity; the second fluidic plate is disposed between the heating chamber and the chamber second fluidic chamber. The microwave oven disclosed by the invention can improve the uniformity of the heated food, further improve the coloring effect on the surface of the food and improve the use experience of a user.

Description

Microwave oven

Technical Field

The invention relates to the technical field of microwave ovens, in particular to a microwave oven.

Background

When an existing microwave oven heats food, the food is usually heated only by jet flow from the upper part of a heating chamber, and the heating mode often causes uneven heating of the upper surface and the lower surface of the food, so that the food is unevenly colored on the surface, and the experience of a user using the microwave oven is easily influenced.

Disclosure of Invention

The invention mainly aims to provide a microwave oven, aiming at improving the uniformity of heating food, further improving the coloring effect on the surface of the food and improving the use experience of a user.

In order to achieve the above object, the present invention provides a microwave oven, which includes a housing, a first flow jet plate and a second flow jet plate, wherein a heating chamber is disposed inside the housing, a first flow jet cavity is disposed above the heating chamber, and a second flow jet cavity is disposed below the heating chamber; the first jet flow plate is arranged between the heating chamber and the first jet flow cavity; the second fluidic plate is disposed between the heating chamber and the chamber second fluidic chamber.

Optionally, an air return cavity is further arranged inside the shell, and the air return cavity is communicated with the first jet cavity and the heating chamber; and/or the air return cavity is communicated with the second jet cavity and the heating chamber.

Optionally, a return air pore plate is arranged between the return air cavity and the heating chamber, and air in the heating chamber can enter the return air cavity through the return air pore plate.

Optionally, the microwave oven further comprises an air duct assembly installed in the air return cavity, wherein the air duct assembly comprises a fan and an air collecting ring, and the air collecting ring is arranged between the fan and the heating chamber to guide the air in the heating chamber to the fan.

Optionally, the upper end of the air return cavity is provided with an air guide surface inclined towards the first jet flow cavity; and/or the lower end part of the air return cavity is provided with an air guide surface inclined towards the second jet flow cavity.

Optionally, a plurality of nozzles are convexly arranged on the upper surface of the second jet plate, and the plurality of nozzles are arranged at intervals.

Alternatively, the plurality of nozzles located in front of the second jet plate are front nozzles, and the jet ports of the front nozzles open toward the front side of the heating chamber.

Optionally, the plurality of nozzles located at the rear of the second jet plate are rear nozzles, and the jet ports of the rear nozzles are opened toward the rear side of the heating chamber.

Optionally, the plurality of nozzles located in front of the second jet plate are front nozzles, the plurality of nozzles located in back of the second jet plate are back nozzles, and the plurality of nozzles located between the front nozzles and the back nozzles are middle nozzles, and the injection ports of the middle nozzles open toward the ceiling of the heating chamber.

Optionally, the plurality of nozzles located at the side of the second flow plate are side nozzles, and the jet ports of the side nozzles face away from the jet ports of the other side nozzles.

Alternatively, the plurality of nozzles located at the side of the second flow jet plate are side nozzles, and the plurality of nozzles located between two side nozzles are middle nozzles, the injection port of which is directed toward the upper side of the heating chamber.

Optionally, the plurality of nozzles close to the periphery of the second jet flow plate are peripheral nozzles, and the jet ports of the peripheral nozzles are radially opened towards the circumferential direction of the second jet flow plate.

Optionally, the plurality of nozzles surrounded by the peripheral nozzle are inner nozzles, and the injection ports of some of the inner nozzles are opened toward the ceiling of the heating chamber.

Optionally, the nozzle is curved in an arc shape towards the direction of air injection.

According to the technical scheme, the first jet flow plate is arranged between the heating chamber and the first jet flow cavity, and the second jet flow plate is arranged between the heating chamber and the second jet flow cavity, so that the first jet flow plate is used for jet heating the upper surface of food, and the second jet flow plate is used for jet heating the lower surface of the food.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a microwave oven incorporating teachings of the present disclosure;

FIG. 2 is a schematic view of a portion of the structure of the microwave oven of FIG. 1;

FIG. 3 is a cross-sectional view taken along the S-plane (a virtual plane perpendicular to the left and right directions of the microwave oven) in FIG. 2;

FIG. 4 is a schematic view illustrating the principle of circulation of hot air inside the microwave oven of FIG. 3;

FIG. 5 is a schematic view of the heating chamber of FIG. 2 with a cooking aid rack disposed therein;

FIG. 6 is a schematic view of a first flow plate according to an embodiment of the present invention;

FIG. 7 is a schematic view of a first flow plate in another embodiment of the microwave oven of the present invention;

fig. 8 is a schematic structural view of a first flow plate in a further embodiment of the microwave oven of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Microwave oven	330a	Left side nozzle
100	Shell body	330b	Right side nozzle
				110	First jet cavity	340	Middle nozzle
120	Second jet cavity	350	Peripheral nozzle
				130	Air return cavity	360	Inner wall nozzle
131	Wind guide surface	400	Cooking auxiliary frame
				140	Heating chamber	500	Air duct assembly
200	First jet flow plate	510	Fan blower
				300	Second jet plate	520	Wind collecting ring
310	Front nozzle	600	Return air pore plate
				320	Rear nozzle	700	Magnetron
330	Side nozzle

The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention discloses a microwave oven which can improve the uniformity of heating food, further improve the coloring effect on the surface of the food and improve the use experience of a user. It should be noted that in fig. 1 to 8 of the specification of the present invention, solid arrows indicate structures such as holes, chambers, or surfaces, and dotted arrows indicate air flow directions.

Referring to fig. 1 to 3, in an embodiment of the microwave oven 10 of the present invention, the microwave oven 10 includes a housing 100, a first flow injection plate 200 and a second flow injection plate 300; a heating chamber 140 is arranged in the housing 100, a first jet cavity 110 is arranged above the heating chamber 140, and a second jet cavity 120 is arranged below the heating chamber 140; the first jet plate 200 is disposed between the heating chamber 140 and the first jet chamber 110; the second jet plate 300 is disposed between the heating chamber 140 and the second jet chamber 120.

Specifically, a cooking sub-rack 400 for placing food is provided in the heating chamber 140 (the cooking sub-rack 400 is shown in fig. 5). The first and

second flow plates

200 and 300 are located at the top and bottom of the heating chamber 140, respectively. The magnetron 700 of the microwave oven 10 may be mounted on the top, or bottom, or side of the heating chamber 140. In heating, the magnetron 700 generates microwaves to the heating chamber 140 to heat food placed in the heating chamber 140.

As for the first flow plate 200, the first flow plate 200 is provided with a plurality of jet holes or nozzles for jetting air downward. The hot wind is supplied to the first jet chamber 110 by the air duct assembly 500, and the hot wind in the first jet chamber 110 is downwardly sprayed to the heating chamber 140 through the first jet plate 200, thereby heating the upper surface of the food in the heating chamber 140. The "hot wind" may be hot wind formed by heating air by a heating aid, or hot air generated in a process of heating food by recycling microwaves.

As for the second flow jet plate 300, the second flow jet plate 300 is provided with a plurality of jet holes or nozzles for jetting air upward. The hot wind is supplied to the second jet chamber 120 by the air duct assembly 500, and the hot wind in the second jet chamber 120 is downwardly sprayed into the heating chamber 140 through the second jet plate 300, thereby heating the lower surface of the food in the heating chamber 140. The "hot wind" may be hot wind formed by heating air by a heating aid, or hot air generated in a process of heating food by recycling microwaves. The second flow plate 300 and the first flow plate 200 may share the same air duct assembly 500, or a separate air duct assembly 500 may be provided for each flow plate.

According to the technical scheme of the invention, the first jet flow plate 200 is arranged between the heating chamber 140 and the first jet flow cavity 110, and the second jet flow plate 300 is arranged between the heating chamber 140 and the second jet flow cavity 120, so that the first jet flow plate 200 is used for spraying and heating the upper surface of food, and the second jet flow plate 300 is used for spraying and heating the lower surface of the food, compared with the conventional mode of slowly conducting heat through a heat conducting plate without jet flow, the mode of synchronously jetting up and down has a high hot air flowing speed, so that the hot air is quickly filled to all directions of the heating chamber 140 and fully contacted with the food, the upper surface and the lower surface of the food are uniformly heated, the color of the upper surface and the lower surface of the heated food are also uniform, and the experience of a user using the microwave oven 10 is effectively improved.

Referring to fig. 3 and 4, as for the wind sources in the first jet chamber 110 and the second jet chamber 120, the wind sources can be fresh air introduced from the outside or air inside the heating chamber 140 is recycled. In order to prevent the food from being polluted by bacteria or dust introduced from the outside air, the air inside the heating chamber 140 may be recycled. In this embodiment, the casing 100 is further provided with an air return cavity 130 inside, and the air return cavity 130 communicates the first jet cavity 110 and the heating chamber 140; and/or, the return air chamber 130 communicates the second jet chamber 120 and the heating chamber 140.

Referring to fig. 3 and 4, in one embodiment, only one air return chamber 130 is disposed inside the housing 100, and the first jet chamber 110 and the second jet chamber 120 share the same air return chamber 130. The return air chamber 130 is disposed at a rear end portion of the heating chamber 140, an upper end of the return air chamber 130 communicates with the first jet chamber 110, and a lower end of the return air chamber 130 communicates with the second jet chamber 120. During heating, a part of the hot air returned from the heating chamber 140 into the return air chamber 130 is supplied into the first jet chamber 110 and is downwardly sprayed from the first jet plate 200 to heat the food, and the other part of the hot air is supplied into the second jet chamber 120 and is upwardly sprayed from the second jet plate 300 to heat the food.

Of course, in other embodiments, two air return cavities 130 may be disposed inside the housing 100, and the two air return cavities 130 are disposed on two opposite sides of the rear end of the heating chamber 140, respectively, wherein one air return cavity 130 communicates with the heating chamber 140 and the first jet cavity 110, and the other air return cavity 130 communicates with both the heating chamber 140 and the second jet cavity 120. During heating, the return air from the heating chamber 140 first enters the two return air chambers 130, and then is delivered to the corresponding jet flow chambers through the return air chambers 130.

In order to reduce the space occupied by the return air chamber 130 and the number of the air duct assemblies 500, the design scheme that the first jet chamber 110 and the second jet chamber 120 share the same return air chamber 130 may be adopted. Further, in order to facilitate the air in the return air chamber 130 to smoothly enter into the corresponding jet flow chamber, an air guide surface 131 inclined toward the first jet flow chamber 110 may be disposed at an upper end portion of the return air chamber 130 to reduce the wind resistance between the return air chamber 130 and the first jet flow chamber 110, so as to facilitate the air flow. Alternatively, a wind guide surface 131 inclined toward the second jet chamber 120 may be provided at a lower end portion of the return air chamber 130 to reduce wind resistance between the return air chamber 130 and the second jet chamber 120, thereby facilitating air flow. The inclined air guide surface 131 may be an arc surface or an inclined surface formed by bending.

Referring to fig. 3 and 4, in the present embodiment, to improve the uniformity of heating, the air duct assembly 500 may also be used to drive the air to flow in an accelerated manner. Specifically, the microwave oven 10 further includes an air duct assembly 500 installed in the air return chamber 130, and the air duct assembly 500 is used to drive air to flow in a rapid circulating manner, so that hot air is filled in different directions of the heating chamber 140, the hot air is distributed more uniformly, the uniformity of food heating is better, and the coloring effect is better. Specifically, the duct assembly 500 includes a fan 510 and a wind-collecting ring 520, the wind-collecting ring 520 being disposed between the fan 510 and the heating chamber 140 to guide the wind of the heating chamber 140 to the fan 510, and the fan 510 may be an axial fan 510 or a centrifugal fan 510, where the fan 510 is a centrifugal fan 510. The wind-collecting ring 520 collects the wind inlet end of the centrifugal fan 510, so that the wind quantity of the centrifugal fan 510 can be increased.

In order to improve the safety of the microwave oven 10, a return air hole plate 600 is provided between the return air chamber 130 and the heating chamber 140, and the air in the heating chamber 140 can enter the return air chamber 130 through the return air hole plate 600. The return air aperture plate 600 is a wall plate having a plurality of return air through holes so as to space the heating chamber 140 from the air duct assembly 500.

Referring to fig. 3 to 5, according to any of the above embodiments, the heating chamber 140 is provided therein with a cooking auxiliary rack 400 for placing food, and the cooking auxiliary rack 400 is located between the first flow plate 200 and the second flow plate 300 and is closer to the second flow plate 300. For the first flow plate 200, a plurality of nozzles are protruded from the lower surface of the first flow plate 200, and the nozzles of the first flow plate 200 spray hot air downward, so that when the hot air sprayed from the first flow plate 200 contacts with food on the cooking aid rack 400, the hot air is blocked by the food and can be diffused to the periphery of the cooking aid rack, thereby heating the edge of the food, and heating the food more uniformly. In the second jet plate 300, a plurality of nozzles are protruded from the lower surface of the second jet plate 300, and the nozzles of the second jet plate 300 spray hot air downward. However, since the space between the second jet plate 300 and the cooking sub-rack 400 is narrow, the hot wind sprayed from the second jet plate 300 is likely to form a vortex, and the food near the door assembly receives less hot wind while the hot wind is more in the area near the rear plate (the hot wind at the front of the heating chamber 140 flows backward).

Referring to fig. 5 and 6, in one embodiment, in order to avoid the uneven heating, the plurality of nozzles located at the front of the second flow plate 300 are front nozzles 310, and the injection ports of the front nozzles 310 are opened toward the front side of the heating chamber 140, so that hot air with a high speed can be injected forward through the front nozzles 310, and the hot air can be prevented from forming a vortex, thereby heating the front region of the food. Specifically, the ejection port of the front nozzle 310 may be opened on the front side wall of the nozzle, or the front nozzle 310 may be inclined or curved forward such that the ejection port of the nozzle is opened toward the front side of the heating chamber 140.

With continued reference to fig. 5 and 6, considering that the hot wind in the front of the heating chamber 140 flows back gradually, the hot wind in the rear of the heating chamber 140 is more concentrated, and the rear area of the food may be excessively heated and easily scorched. Therefore, in order to prevent the rear fishing area of the food from being excessively heated, in the present embodiment, the plurality of nozzles located at the rear of the second jet plate 300 are rear nozzles 320, and the jet ports of the rear nozzles 320 are opened toward the rear side of the heating chamber 140. By the design, the rear nozzle 320 is inclined backwards to blow air, so that hot air at the rear part of the heating chamber 140 is blown away backwards in time, the hot air quantity at the rear part of the heating chamber 140 is reduced, the hot air quantity at the front part and the rear part of the heating chamber 140 is basically consistent, and the front area and the rear area of food are heated uniformly. Specifically, the ejection port of the rear nozzle 320 may be opened on the rear side wall of the nozzle, or the rear nozzle 320 may be inclined or curved rearward such that the ejection port of the nozzle is opened toward the rear side of the heating chamber 140.

Referring also to fig. 5 and 6, in addition, a plurality of the nozzles located between the front nozzle 310 and the rear nozzle 320 are middle nozzles 340, and forward or backward blowing is possible for the middle nozzles 340. However, in order to heat the middle region of the food, it is preferable that the injection port of the middle nozzle 340 is opened toward the ceiling of the heating chamber 140. During heating, the middle nozzle 340 blows upward directly to heat the middle area of the food directly.

Referring to fig. 5 and 7, in another embodiment, the difference from the above embodiments is that the plurality of nozzles located at the side of the second flow plate 300 are side nozzles 330, and the ejection ports of the side nozzles 330 face away from the ejection ports of the other side nozzles 330. For example, the plurality of nozzles positioned at the left side of the second flow plate 300 are left side nozzles 330a, and the ejection ports of the left side nozzles 330a are opened to the left side; the plurality of nozzles positioned at the right side of the second jet plate 300 are right side nozzles 330b, and the ejection ports of the right side nozzles 330b are opened to the right side. When heating, the left side nozzle 330a sprays hot air to the left side, and the right side nozzle 330b sprays hot air to the right side, so that the hot air sprayed by the second jet plate 300 is gradually diffused to both sides thereof, a vortex is not easily formed, and both sides of food are effectively and uniformly heated.

Further, a plurality of the nozzles located between the two side nozzles 330 are middle nozzles 340, and forward or backward blowing is possible for the middle nozzles 340. However, in order to heat the middle region of the food, it is preferable that the injection port of the middle nozzle 340 is opened toward the ceiling of the heating chamber 140. During heating, the middle nozzle 340 blows upward directly to heat the middle area of the food directly.

Referring to fig. 5 and 8, in another embodiment, the difference from the above embodiments is that the plurality of nozzles near the periphery of the second flow jet plate 300 are peripheral nozzles 350, and the injection ports of the peripheral nozzles 350 are radially opened toward the circumferential direction of the second flow jet plate 300. When heating, the peripheral nozzle 350 radially sprays hot air around the second flow jet plate 300, thereby heating the peripheral area of the food.

The plurality of nozzles surrounded by the peripheral nozzles 350 are inner nozzles 360, and in order to ensure uniform heating of the central region and the peripheral region of the food, the ejection ports of a part of the inner nozzles 360 are opened toward the ceiling of the heating chamber 140, and the remaining part may be opened forward or backward, thus ensuring that the central region of the food is also heated by hot wind, so that the central region and the peripheral region of the food are heated uniformly.

Based on any one of the above embodiments, in order to reduce the resistance of the nozzle to jet hot air, the nozzle is curved in an arc shape toward the direction of the jet air. The arc-shaped bent nozzle has small resistance to air flow, is favorable for reducing wind loss, enables hot air to be sprayed out and keeps high wind speed, and accelerates the heating efficiency of food. For example, the front nozzle 310 is curved toward the front of the heating chamber 140; the rear nozzle 320 is curved toward the rear of the heating chamber 140; the left nozzle is curved in an arc shape toward the left part of the heating chamber 140; the right nozzle is curved in an arc shape toward the right of the heating chamber 140.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A microwave oven, characterized in that it comprises:

the heating device comprises a shell, a first jet cavity and a second jet cavity, wherein a heating chamber is arranged in the shell, the first jet cavity is arranged above the heating chamber, and the second jet cavity is arranged below the heating chamber;

the first jet flow plate is arranged between the heating chamber and the first jet flow cavity;

the second jet flow plate is arranged between the heating chamber and the second jet flow cavity;

the upper surface of the second jet flow plate is convexly provided with a plurality of nozzles which are arranged at intervals, wherein the part of the nozzles close to the middle part of the second jet flow plate is upwards arranged, and the nozzles at the two opposite side parts of the middle part of the second jet flow plate are arranged in the opposite directions.

2. The microwave oven of claim 1, wherein a return air chamber is further provided inside the housing, the return air chamber communicating the first jet chamber and the heating chamber; and/or the air return cavity is communicated with the second jet cavity and the heating chamber.

3. A microwave oven as defined in claim 2, wherein a return air aperture is provided between said return air chamber and said heating chamber, air within said heating chamber being able to enter said return air chamber through said return air aperture.

4. The microwave oven of claim 2, further comprising an air duct assembly mounted within the return air cavity, the air duct assembly including a fan and a wind-collecting collar disposed between the fan and a heating chamber to direct the heating chamber wind to the fan.

5. The microwave oven of claim 2, wherein an upper end of the return air chamber is provided with a wind guide surface inclined toward the first jet chamber; and/or the lower end part of the air return cavity is provided with an air guide surface inclined towards the second jet flow cavity.

6. A microwave oven as claimed in any one of claims 1 to 5, wherein said plurality of nozzles located in front of said second jet plate are front nozzles, the jet openings of said front nozzles opening towards the front side of said heating chamber.

7. The microwave oven of claim 6 wherein said plurality of nozzles located at the rear of said second jet plate are rear nozzles, the jet ports of said rear nozzles opening toward the rear side of said heating chamber.

8. A microwave oven as claimed in any one of claims 1 to 5 wherein said plurality of nozzles located at the front of said second jet plate are front nozzles, said plurality of nozzles located at the rear of said second jet plate are rear nozzles, and said plurality of nozzles located between said front nozzles and said rear nozzles are middle nozzles, the jet ports of said middle nozzles opening towards the ceiling of said heating chamber.

9. The microwave oven according to any one of claims 1 to 5, wherein the plurality of nozzles located at the side of the second flow plate are side nozzles having ejection openings facing away from the ejection openings of the other side nozzles.

10. The microwave oven according to any one of claims 1 to 5, wherein the plurality of nozzles located at the side of the second flow plate are side nozzles, and the plurality of nozzles located between two of the side nozzles are middle nozzles, the injection port of the middle nozzles being directed to the upper side of the heating chamber.

11. The microwave oven according to any one of claims 1 to 5, wherein the plurality of nozzles near the periphery of the second jet plate are peripheral nozzles having injection ports that are opened radially toward the circumference of the second jet plate.

12. The microwave oven of claim 11 wherein the plurality of nozzles surrounded by the peripheral nozzle are inner nozzles, and wherein the injection ports of some of the inner nozzles open toward the ceiling of the heating chamber.

13. A microwave oven as claimed in any one of claims 1 to 5 wherein said nozzles are arcuately curved in a direction towards which they emit air.