CN208312472U

CN208312472U - Air flow duct and micro-wave oven

Info

Publication number: CN208312472U
Application number: CN201820321270.6U
Authority: CN
Inventors: 林健; 陈金鑫; 赵涛; 行晓亮; 彭定元; 黄志飞
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: 2018-03-08
Filing date: 2018-03-08
Publication date: 2019-01-01
Anticipated expiration: 2028-03-08

Abstract

The utility model proposes a kind of air flow duct and micro-wave oven, the air flow duct is installed on the inner wall chamber of micro-wave oven, and including sprue and air intake duct.The sprue is equipped with sprue entrance and exhanst gas outlet.The air intake duct has smoke inlet and air intake port positioned at the both ends of the air intake duct, wherein, the air intake port is connected to the sprue entrance, the junction of the air intake duct and the sprue is in smooth transition setting, so that deriving from the flue gas that the smoke inlet enters gently flows into the sprue from the air intake duct, and it is discharged from the exhanst gas outlet.The utility model can reduce energy loss of the air-flow in the air flow duct, and improve the efficiency that air-flow passes through from the air flow duct.

Description

Airflow duct and microwave oven

Technical Field

The utility model relates to a microwave cooking device technical field, in particular to air current wind channel and microwave oven.

Background

In the prior art, many microwave ovens have the functions of microwave heating and oil smoke suction at the same time, for example, a wall-mounted microwave oven is usually installed above a cooking range, and generally can perform microwave heating and oil smoke suction at the same time, and a smoke passage for the sucked smoke to pass through is generally arranged inside the microwave oven. In the prior art, as shown in fig. 1, flue gas channels inside a microwave oven are formed by arranging partition boards inside the microwave oven, which leads to high requirements on assembly precision of the microwave oven; on the other hand, the flue gas channel formed by the partition arrangement has more corners, and the flue gas easily forms vortex when flowing through the corners of the flue gas channel, so that the flow of the flue gas is blocked, and the efficiency of sucking the oil smoke is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an air current wind channel and microwave oven, aim at reducing the air current and be in energy loss in the air current wind channel, and improve the air current certainly the efficiency of passing through in the air current wind channel.

In order to realize above technical purpose, the utility model provides an air current wind channel installs in the inner wall chamber of microwave oven, the air current wind channel includes:

the main flow channel is provided with a main flow channel inlet and a smoke outlet; and the number of the first and second groups,

the intake duct has and is located the flue gas entry and the intake duct export at the both ends of intake duct, wherein, the intake duct export with the sprue entry intercommunication, the intake duct with the junction of sprue is smooth transition setting, so that certainly the flue gas that the flue gas entry got into certainly the intake duct gently flows in the sprue, and certainly the exhanst gas outlet is discharged.

Preferably, the intake duct with the sprue is the contained angle setting, the intake duct with the juncture of sprue is crooked runner setting.

Preferably, the air inlet channel extends along the vertical direction, the lower port of the air inlet channel is the flue gas inlet, and the upper port of the air inlet channel is the air inlet channel outlet;

the sprue is along controlling to extending, the sprue have with the near-end that the intake duct is connected and keep away from the distal end of intake duct, wherein, the sprue entry is located the near-end, the exhanst gas outlet is located the distal end.

Preferably, the primary flow passage comprises a front sidewall, a rear sidewall, an upper sidewall, a lower sidewall, and proximal and distal end walls.

Preferably, the flue gas outlet is provided in the upper side wall and located at the intersection of the upper side wall and the distal end wall.

Preferably, the distal end wall and the lower side wall are in arc transition arrangement, so that the airflow in the airflow duct is smoothly guided from the distal end wall to flow out from the smoke outlet; and/or the presence of a gas in the gas,

the sprue entry is located the near-end is in the region of leaning on down, and sets up near the end wall preceding lateral wall, back lateral wall or the lateral wall down, go up the lateral wall with the juncture of near the end wall is circular arc transition setting, in order to will certainly the air current that the sprue entry got into smoothly leads to in the sprue.

Preferably, the intake duct includes first intake duct and second intake duct, wherein, first intake duct with the flue gas entry of second intake duct is corresponding to first flue gas entry and second flue gas entry.

Preferably, the lower extreme of first intake duct with be connected with the connecting plate between the lower extreme of second intake duct, the connecting plate runs through along upper and lower direction and is equipped with first connecting hole and second connecting hole, first flue gas entry and second flue gas entry correspond fixed connection in first connecting hole with the second connecting hole.

Preferably, the first air inlet channel and the second air inlet channel are arranged in front and at the back side by side.

Preferably, the first air inlet channel comprises a first flue gas inlet section and a first connecting section, wherein the first flue gas inlet section and the first connecting section are sequentially arranged from bottom to top, the first flue gas inlet section is arranged by deviating from the main flow channel in the front-back direction, the first flue gas inlet section is in smooth transition connection with the first connecting section, and the first connecting section is in smooth transition connection with the main flow channel;

the second intake duct including from lower supreme second flue gas inlet section that sets gradually and with the second linkage segment that second flue gas inlet section is connected, second flue gas inlet section with second linkage segment smooth transition connects, the second linkage segment with smooth transition connects between the sprue.

Preferably, in the front-back direction, the first flue gas inlet and the second flue gas inlet are arranged to deviate from the respective inlet channel outlets towards the same side, and the second flue gas inlet is arranged closer to the main channel inlet.

Preferably, the direction in which the first air inlet channel and the second air inlet channel are back to back is the outer side, and the direction in which the first air inlet channel and the second air inlet channel are close to each other is the inner side;

the side wall of the first air inlet channel, which is positioned at the outer side, and the part, which is positioned at the inner side, of the side wall of the first air inlet channel, which is positioned at the first flue gas inlet section are arranged correspondingly to a first spline curved surface and a second spline curved surface which protrude outwards;

the second air inlet channel is located on the side wall on the outer side and the side wall on the inner side are located on the portion of the second flue gas inlet section and are arranged corresponding to the third spline surface and the fourth spline surface protruding towards the inner side.

Preferably, the tension of the spline curve corresponding to the first spline surface is T1, the tension of the spline curve corresponding to the second spline surface is T2, the tension of the spline curve corresponding to the third spline surface is T3, and the tension of the spline curve corresponding to the fourth spline surface is T4, wherein the values of T1, T2, T3 and T4 are all greater than or equal to 0.5 and less than or equal to 1.

Preferably, the main flow channel comprises a front side wall, a rear side wall, an upper side wall, a lower side wall, a proximal end wall and a distal end wall, the main flow channel corresponding to a main flow channel inlet communicated with the first air inlet channel is a first main flow channel inlet, and the main flow channel corresponding to a main flow channel inlet communicated with the second air inlet channel is a second main flow channel inlet; wherein,

the first main flow channel inlet and the second main flow channel inlet are both arranged on the near end wall; or,

the first main flow channel inlet and the second main flow channel inlet are arranged on the lower side wall; or,

the first main flow channel inlet is arranged on the front side wall, and the second main flow channel inlet is arranged on the near end wall.

Preferably, the air current wind channel still includes supplementary flue, the one end of supplementary flue be with the supplementary flue gas entry of intake duct intercommunication, the other end is towards keeping away from the intake duct extends in order to form supplementary exhanst gas outlet.

the main runner extends in the left-right direction, and is provided with a near end connected with the air inlet channel and a far end far away from the air inlet channel, wherein the inlet of the main runner is arranged at the near end, and the flue gas outlet is arranged at the far end;

the auxiliary flue extends along the vertical direction, and the lower port of the auxiliary flue is the auxiliary flue gas inlet, and the auxiliary flue gas inlet is communicated with the lower end of the air inlet channel.

Preferably, the number of the air inlet channels is two, and the air inlet channels comprise a first air inlet channel and a second air inlet channel, wherein inlets of the first air inlet channel and the second air inlet channel are correspondingly a first flue gas inlet and a second flue gas inlet, the first flue gas inlet and the second flue gas inlet are distributed at intervals in the front-back upward direction, and the second flue gas inlet is arranged closer to the main flow channel inlet in the front-back upward direction;

and an auxiliary flue gas inlet of the auxiliary flue is communicated with the lower end of the first air inlet channel.

Preferably, the cross-sectional area of the primary flow channel is equivalent to the sum of the areas of the inlets of the primary flow channel; and/or the presence of a gas in the gas,

the cross section area of the main flow passage is equivalent to the sum of the areas of the flue gas inlets; and/or the presence of a gas in the gas,

the area of the flue gas outlet is equivalent to the sum of the areas of the inlets of the main flow channels; and/or the presence of a gas in the gas,

the area of the flue gas outlet is equivalent to the sum of the areas of the flue gas inlets.

Preferably, the cross section of the air inlet channel and/or the main channel is square, circular or oval.

The utility model also provides a microwave oven, include:

the air conditioner comprises an outer shell and an inner shell, wherein an inner wall cavity is defined between the outer shell and the inner shell, and an air inlet and an air outlet are formed in the outer shell;

the airflow air duct comprises a main flow passage and an air inlet passage, wherein the main flow passage is provided with a main flow passage inlet and a smoke outlet. The air inlet channel is provided with a flue gas inlet and an air inlet channel outlet which are positioned at two ends of the air inlet channel, wherein the air inlet channel outlet is communicated with the main channel inlet, and the joint of the air inlet channel and the main channel is in smooth transition arrangement, so that flue gas entering from the flue gas inlet smoothly flows into the main channel from the air inlet channel and is discharged from the flue gas outlet, and the flue gas inlet and the flue gas outlet are correspondingly communicated with the air inlet and the air outlet and form an air flow passage together; and the number of the first and second groups,

and the fan is arranged on the air flow path and used for conveying the smoke of the air inlet to the air outlet along the air flow duct.

Preferably, the air inlet channel extends in the up-down direction and is arranged between the outer shell and two adjacent side walls of the inner shell in the left-right direction.

Preferably, the fan is arranged between the flue gas inlet and the air inlet, and the flue gas inlet is connected with the air outlet end of the outer cover of the fan through a flange device; and/or the presence of a gas in the gas,

the air outlet sets up the rear side wall of shell, the exhanst gas outlet pass through the spiro union piece with the rear side wall in inner wall chamber links to each other, perhaps, the air outlet sets up the roof of shell, the exhanst gas outlet pass through the spiro union piece with the roof of shell is connected or is located the inboard last air outlet baffle of roof of shell is connected.

Preferably, the airflow duct further comprises an auxiliary flue, the auxiliary flue extends in the vertical direction, a lower port of the auxiliary flue is an auxiliary flue gas inlet, the auxiliary flue gas inlet is communicated with the lower end of the air inlet duct, and an upper end of the auxiliary flue is an auxiliary flue gas outlet;

a cavity is formed in the front side wall of the shell, an auxiliary air outlet communicated with the cavity is formed in the upper end of the front side wall, and the auxiliary flue gas outlet is connected with the front side wall of the shell through a screw connector so as to be communicated with the cavity.

The utility model provides an among the technical scheme, through setting up independent air current wind channel in microwave oven's inner wall intracavity to, because the junction of intake duct and sprue is smooth transition setting, make certainly the flue gas that the flue gas entry got into certainly the intake duct flows in gently the sprue to prevent that the flue gas from taking place the vortex at the in-process that microwave oven flows, and then can reduce the air current and be in energy loss in the air current wind channel, and improve the air current certainly the efficiency that passes through in the air current wind channel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 view showing an overall structure of a microwave oven according to the related art;

fig. 2 is a schematic view of an overall structure of a microwave oven according to an embodiment of the present invention;

fig. 3 is a partial structural view of the microwave oven shown in fig. 2;

fig. 4 is a schematic structural view of a first embodiment of an airflow duct in the microwave oven provided in fig. 2;

fig. 5 is a schematic structural view of a second embodiment of an air flow duct in the microwave oven provided in fig. 2;

FIG. 6 is a schematic view of the airflow duct shown in FIG. 5;

fig. 7 is a schematic structural view of a third embodiment of an airflow duct in the microwave oven provided in fig. 2;

fig. 8 is a schematic structural view of a fourth embodiment of an airflow duct in the microwave oven provided in fig. 2;

fig. 9 is a schematic structural view of a fifth embodiment of an airflow duct in the microwave oven provided in fig. 2.

The reference numbers illustrate:

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments 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, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a schematic view of an overall structure of a microwave oven in the prior art, as shown in fig. 1, smoke passages inside the microwave oven in the prior art are all partitioned by arranging a partition plate 104 in the microwave oven, which results in a high requirement on assembly accuracy of the microwave oven; on the other hand, the flue gas channel formed by the partition arrangement has more corners, and the flue gas easily forms vortex when flowing through the corners of the flue gas channel, so that the flow of the flue gas is blocked, and the efficiency of sucking the oil smoke is low.

The utility model provides a microwave oven, fig. 2 and fig. 3 are the utility model provides an embodiment of a microwave oven. As shown in the drawings, the microwave oven includes an outer casing 101 (in the drawings, the outer casing 101 is only partially shown, and the top wall and two side walls of the outer casing 101 are removed to observe the internal structure), an inner casing 102, an airflow duct 103 and a blower 105, wherein an inner wall cavity 100 is defined between the outer casing 101 and the inner casing 102, and an air inlet and an air outlet are formed in the outer casing 101. In the embodiment shown in fig. 4, the airflow duct 103 has a flue gas inlet 21 and a flue gas outlet 11, and the flue gas inlet 21 and the flue gas outlet 11 are correspondingly communicated with the air inlet and the air outlet, and together form an airflow path. The fan 105 is disposed on the air flow path, and is configured to convey the flue gas from the air inlet to the air outlet along the air flow duct 103.

The airflow duct 103 is installed in an inner wall cavity 100 of the microwave oven, and the airflow duct 103 includes a main duct 1 and an inlet duct 2. The main flow passage 1 is provided with a main flow passage inlet 18 and a flue gas outlet 11, wherein the flue gas outlet 11 is used for being communicated with an air outlet arranged on a shell 101 of the microwave oven. Intake duct 2 has and is located the flue gas entry 21 and the intake duct export 24 at the both ends of intake duct 2, wherein, the flue gas entry 21 with locate income wind gap intercommunication on the shell 101, intake duct export 24 with the sprue entry 18 intercommunication, intake duct 2 with the junction of sprue 1 is smooth transition setting, so that certainly the flue gas that the flue gas entry 21 got into certainly 2 gentle inflows of intake duct 1, and certainly 11 discharges of flue gas export.

Through set up independent air current wind channel 103 in microwave oven's inner wall cavity 100 to, because the junction of intake duct 2 and sprue 1 is smooth transition setting, make certainly flue gas that flue gas entry 21 got into slowly flows into from intake duct 2 sprue 1 prevents that the flue gas from the in-process that flows in microwave oven from taking place the vortex, and then can reduce the air current and be in the energy loss in the air current wind channel 103, and improve the air current certainly the efficiency that passes through in the air current wind channel 103.

As shown in fig. 2, in the embodiment of the present invention, the air inlet 2 extends in the up-down direction, and the outer shell 101 and the inner shell 102 are disposed between the adjacent side walls in the left-right direction. The fan 105 may be disposed in the airflow duct 103, or may be disposed on the airflow path outside the airflow duct 103. In this embodiment, the fan 105 is disposed outside the airflow duct 103 and located between the flue gas inlet 21 and the air inlet, and the flue gas inlet 21 is connected to the air outlet end of the outer cover of the fan 105 through a flange device, and the connection is simple and reliable through the flange device.

The air outlet can be arranged on the rear side wall of the outer shell 101, or on the top wall of the outer shell 101, and when the air outlet is arranged on the rear side wall of the outer shell 101, the smoke outlet 11 can be connected with the rear side wall of the inner wall cavity through a screw connector; when the air outlet sets up when the roof of shell 101, smoke outlet 11 accessible spiro union piece with the roof of shell 101 is connected or is connected with locating the inboard last air outlet baffle 5 of the roof of shell 101, will through the spiro union piece the smoke outlet install extremely shell 101 simple to operate and reliable. In the embodiment of the present invention, as shown in fig. 2 and 3, the air outlet is disposed on the top wall of the housing 101, and the smoke outlet 11 is connected to the upper air outlet baffle 5 disposed on the inner side of the top wall of the housing 101 through a screw.

Because of the air duct 103 lays the inner wall cavity 100 of microwave oven, and the flue gas entry 21 and the exhanst gas outlet 11 of air duct 103 lay on the different lateral walls of microwave oven, so intake duct 2 with sprue 1 is the contained angle setting usually, and the usual air current of this contained angle department changes the angle because of so needing, and takes place the torrent easily, so the utility model discloses an embodiment, as shown in fig. 2 and fig. 4, intake duct 2 with sprue 1's juncture is crooked runner setting to reduce the air loss at this contained angle department.

As shown in fig. 2 and fig. 4, in the embodiment of the present invention, the inlet 2 extends upward and downward, the lower port of the inlet 2 is the flue gas inlet 21, and the upper port of the inlet 2 is the inlet outlet 24. The sprue 1 is along controlling to extending, sprue 1 have with the near-end that intake duct 2 connects and keep away from the distal end of intake duct 2, wherein, sprue entry 18 is located the near-end, exhanst gas outlet 11 is located the distal end, so, sprue 1 certainly one side in the left and right sides position of microwave oven extends to the position in middle more, in order to facilitate arranging of exhanst gas outlet 11.

Fig. 2 and fig. 4 show, in the embodiment of the present invention, because the inlet duct 2 is located the outer shell with the inner shell is located between the adjacent both sides lateral wall on right side, so, the right-hand member of the main flow passage 1 is the near-end, and the left end is the far end, and obviously this design is not limited to this, the inlet duct 2 can locate the outer shell 101 with the inner shell 102 is located between the adjacent both sides lateral wall on left side, the left end of the main flow passage 1 is the near-end and the right-hand member is the far end. The primary flow channel 1 comprises in particular a front side wall 12, a rear side wall 13, an upper side wall 14, a lower side wall 15, and a proximal end wall 16 (corresponding to the left end wall in the present embodiment) and a distal end wall 17 (corresponding to the right end wall in the present embodiment).

The smoke outlet 11 is disposed at the far end, and the specific location is not limited, and may be disposed on the upper side wall 14, or may be disposed on the rear side wall 13, in this embodiment, the smoke outlet 11 is disposed on the upper side wall 14, and is located at a junction between the upper side wall 14 and the far end wall 17, so that smoke can flow out from the smoke outlet 11 along the far end wall 17.

In order to reduce the resistance of the flue gas near the flue gas outlet 11, as shown in fig. 2 and 4, in the embodiment of the present invention, the distal end wall 17 and the lower side wall 15 are in a circular arc transition arrangement, so as to smoothly guide the air flow in the air flow duct 103 from the distal end wall 17 to flow out from the flue gas outlet 11. The distal end wall 17 and the lower side wall 15 are in arc transition arrangement, and can guide the smoke to gradually change the flow direction, so that the resistance of the smoke when the smoke is discharged from the smoke outlet 11 is reduced.

The main runner inlet 18 is disposed at the near end of the main runner 1, and the specific disposition position varies according to actual needs, as shown in fig. 2 and 4, in the embodiment of the present invention, the main runner inlet 18 is located at the near-down region of the near end, and is disposed at the near-end wall 16, the front sidewall 12, the rear sidewall 13 or the lower sidewall 15. The junction between the upper sidewall 14 and the proximal end wall 16 is in a circular arc transition arrangement, so as to smoothly guide the air flow entering from the main flow channel inlet 18 into the main flow channel 1. In this embodiment, the junction between the upper sidewall 14 and the proximal wall 16 is in a circular arc transition configuration, which can guide the smoke to gradually change the flow direction when passing through the junction.

The intake duct 2 can set up one, also can set up a plurality ofly, and specific quantity does not do the restriction, as shown in fig. 2 and fig. 4 in the embodiment of the utility model, intake duct 2 sets up to two, including first intake duct 22 and second intake duct 23, wherein, first intake duct 22 with the flue gas entry 21 of second intake duct 23 corresponds to first flue gas entry and second flue gas entry to in the embodiment shown in fig. 2 and fig. 3, first flue gas entry with the second flue gas entry corresponds and corresponds the air-out end butt joint of the dustcoat of fan.

For the convenience of the installation of airflow duct 103, as shown in fig. 2 and 4, in the embodiment of the present invention, the lower end of first intake duct 22 and connecting plate 4 is connected between the lower end of second intake duct 23, connecting plate 4 runs through first connecting hole and second connecting hole along the up-down direction, and first flue gas inlet and second flue gas inlet correspond fixed connection in first connecting hole with the second connecting hole. During installation, the connecting plate 4 can be directly connected with the internal structure of the inner wall cavity (in this embodiment, the air outlet end of the outer cover of the fan 105) through, for example, a screw connector, and the connection is convenient and reliable.

The first air inlet duct 22 and the second air inlet duct 23 are arranged in different manners, as required, for example, as shown in fig. 2 and fig. 3, in the embodiment of the present invention, the first air inlet duct 22 and the second air inlet duct 23 are located between the outer shell 101 and the side wall of the inner shell 102 located at the left and right sides, so that the first air inlet duct 22 and the second air inlet duct 23 are arranged side by side in the front-back direction, so that the first air inlet duct 22 and the second air inlet duct 23 are arranged reasonably and compactly.

In order to make the flue gas flow in first intake duct 22 and second intake duct 23, and in the process of flowing to main runner 1 from first intake duct 22 and second intake duct 23, the flow direction only takes place gently to change and can not take place the sudden change to reduce the resistance that the flue gas received in the air flow duct 103 flow process, as shown in fig. 2 and 4, in the embodiment of the utility model, first intake duct 22 includes first flue gas inlet section 221 that sets gradually from bottom to top and with first linkage segment 222 that first flue gas inlet section 221 connects, first flue gas inlet section 221 upwards deviates from front to back main runner 1 sets up, first flue gas inlet section 221 with first linkage segment 222 smooth transition connects, first linkage segment 222 with smooth transition connects between the main runner 1. The second inlet duct 23 includes a second flue gas inlet section 231 and a second connecting section 232 connected to the second flue gas inlet section 231, the second flue gas inlet section 231 and the second connecting section 232 are connected in a smooth transition mode, and the second connecting section 232 and the main flow channel 1 are connected in a smooth transition mode.

In order to make the air flow duct more reasonably utilize the space in arrangement, the main flow duct 1, the first air inlet 22 and the second air inlet 23 are usually arranged in a staggered manner in the front-back direction, specifically, as shown in fig. 4 and fig. 6 to 9, in the front-back direction, the first flue gas inlet and the second flue gas inlet are arranged in a manner of deviating from the respective air inlet outlet 24 towards the same side (in each embodiment, they are both deviated from the respective air inlet outlet 24 towards the front side), and the second flue gas inlet is arranged closer to the inlet of the main flow duct 1, so that the arrangement of the air flow duct 103 in the microwave oven is compact, and the first flue gas inlet and the second flue gas inlet are both deviated towards the same side, so that two flue gases in the first air inlet 22 and the second air inlet 23 are convenient to flow into the main flow duct 1, the problem that mutual interference of air flows is large when the air flows are converged due to the fact that a large included angle exists between the first air inlet channel 22 and the second air inlet channel 23 is avoided.

Except the connection of the air inlet channel 2 and the main channel 1, the shape of the air inlet channel 2 has a large influence on the resistance of the smoke. In order to better ensure the smooth flow of the flue gas in the airflow duct 103, as shown in fig. 2 and 4, in the embodiment of the present invention, the first inlet duct 22 and the second inlet duct 23 are opposite to each other in the outer side, and the direction close to each other is the inner side. The outer side wall of the first air inlet channel 22 and the inner side wall of the first air inlet channel are located at the part of the first flue gas inlet section 221, and the first spline surface and the second spline surface which protrude outwards are arranged correspondingly. The side wall of the second inlet channel 23 on the outer side and the side wall on the inner side are located at the part of the second flue gas inlet section 231, and are arranged corresponding to the third spline surface and the fourth spline surface protruding inwards. The first air inlet 22 and the second air inlet 23 are formed in a multi-segment spline shape, so that the first air inlet 22 and the second air inlet 23 are smooth and have small resistance.

Specifically, the tension of the spline curve corresponding to the first spline surface is T1, the tension of the spline curve corresponding to the second spline surface is T2, the tension of the spline curve corresponding to the third spline surface is T3, and the tension of the spline curve corresponding to the fourth spline surface is T4, where the values of T1, T2, T3, and T4 are all greater than or equal to 0.5 and less than or equal to 1. The larger the value of the tension of the spline curve is, the closer the corresponding spline curve approaches to a straight line, and the smoother the smoke flows in the spline curve. However, the value of the width of the spline curve should not be too large, and the spline curve is too close to a straight line, which is not favorable for changing the flow direction of the flue gas, and further is not favorable for the arrangement of the airflow duct 103 in the main shell of the microwave oven. The values of T1, T2, T3 and T4 are all more than or equal to 0.5 and less than or equal to 1, which not only can ensure that the smoke flow does not suffer from excessive resistance, but also can facilitate the arrangement of the airflow duct 103 in the main shell of the microwave oven.

Except the shape of the air inlet channel 2, the resistance of the smoke inlet position of the main flow channel 1 to the smoke entering the main flow channel is influenced, especially for the condition that a plurality of strands of smoke converge into the main flow channel 1, the resistance of the smoke inlet position of the main flow channel 1 to the smoke converging has great influence. In the embodiment of the utility model, correspond two air inlet duct scheme circumstances, the flue gas of sprue 1 enters the position and is provided with different settings, specifically as follows:

in the embodiment shown in fig. 8, the first main flow channel inlet and the second main flow channel inlet are both disposed on the near end wall 16, so that the first main flow channel inlet and the second main flow channel inlet can flow into the main flow channel 1 from the near end wall 16 in parallel, which is favorable for reducing the confluence included angle between the flue gas entering the main flow channel 1 from the first main flow channel inlet and the flue gas entering the main flow channel 1 from the second main flow channel inlet, thereby reducing the resistance suffered by the flue gas from the confluence at the near end rear portion of the main flow channel 1.

In the embodiment shown in fig. 4, the first main flow channel inlet and the second main flow channel inlet are both disposed on the lower sidewall 15, so that the first main flow channel inlet and the second main flow channel inlet can flow into the main flow channel 1 from the lower sidewall 15 in parallel, which is favorable for reducing the converging included angle between the flue gas entering the main flow channel 1 from the first main flow channel inlet and the flue gas entering the main flow channel 1 from the second main flow channel inlet, thereby reducing the resistance of the flue gas on the converging of the flue gas at the lower portion of the near end of the main flow channel 1.

In the embodiment shown in fig. 5 and 6, the first main flow passage inlet is disposed on the front side wall 12, and the second main flow passage inlet is disposed on the near end wall 16, so that the length of the first air inlet passage 22 can be shortened, and the smoke path can be shortened, so as to reduce the air flow loss in the smoke path.

Besides the main channel 1 and the air inlet channel 2, the airflow channel 103 may be additionally provided with an auxiliary flue 3 as required. In the embodiment shown in fig. 2, the airflow duct 103 further includes an auxiliary flue 3, one end of the auxiliary flue 3 is an auxiliary flue gas inlet 33 communicated with the air inlet 2, the other end of the auxiliary flue 3 faces away from the air inlet 2 and extends to form an auxiliary flue gas outlet 34, and an auxiliary air outlet 1011 is arranged on the housing 101 corresponding to the auxiliary flue gas outlet 34. The auxiliary flue 3 can be selectively blocked and communicated according to actual conditions to meet the requirements of different occasions, so that the universality of the airflow duct 103 is improved.

The utility model discloses do not do the restriction to the hookup location and the extending direction of auxiliary flue 3. In the embodiment shown in fig. 2, and "the inlet 2 extends in the up-down direction," the lower port of the inlet 2 is the flue gas inlet 21, and the upper port of the inlet 2 is the outlet of the inlet 2; the sprue 1 is along controlling to extending, sprue 1 have with the near-end that intake duct 2 is connected and keep away from the distal end of intake duct 2, wherein, sprue entry 18 is located the near-end, exhanst gas outlet 11 is located on the basis of distal end ", supplementary flue 3 is along extending from top to bottom, just the lower port of supplementary flue 3 does supplementary flue gas entry 33, just supplementary flue gas entry 33 with 2 lower extreme intercommunications of intake duct, the last port of supplementary flue 3 is supplementary flue gas outlet 34. The auxiliary flue gas inlet 33 is communicated with the lower end of the air inlet channel 2, so that after entering the flue gas inlet 21, flue gas can be directly discharged through the auxiliary flue 3, and resistance of the flue gas in the discharging process of the air flow channel 103 can be reduced.

The position of the auxiliary air outlet 1011 is different according to actual needs, so there is no limitation, for example, as shown in fig. 2, in the embodiment of the present invention, a cavity is further formed in the front side wall of the housing 101 to guide the flow of the flue gas, the auxiliary air outlet 1011 is disposed at the upper end of the front side wall and is communicated with the cavity (and specifically, the front side wall is hollow and is provided with a grid at the upper end thereof to form the auxiliary air outlet 1011), and the auxiliary flue gas outlet 34 is connected with the front side wall of the housing 101 through a screw connector to be communicated with the cavity.

Please refer to fig. 2 to 4, in the embodiment of the present invention, the auxiliary flue 3 includes an auxiliary flue smoke inlet section 31 extending along the vertical direction and an auxiliary flue smoke outlet section 32 extending from the main flow channel 1 towards the auxiliary flue smoke inlet section 31, the resistance of the smoke flowing in the auxiliary flue 3 also affects the user experience of using the microwave oven to suck the smoke, and the junction of the auxiliary flue smoke inlet section 31 and the auxiliary flue smoke outlet section 32 is set in a circular arc transition manner to reduce the loss of kinetic energy of the smoke flowing in the auxiliary flue 3.

Based on be provided with two embodiments of intake duct 2, as shown in fig. 4 and 6 ~ 9, intake duct 2 includes first intake duct 22 and second intake duct 23, wherein, first intake duct 22 with the entry of second intake duct 23 corresponds to first flue gas entry and second flue gas entry, first flue gas entry and second flue gas entry are upwards interval distribution in the front and back, and upwards in the front and back, the second flue gas entry is closer to sprue inlet 18 sets up, is also close to at sprue 1 under the condition that the back wall of the inner wall chamber of microwave oven set up, and second flue gas entry sets up by the back, and first flue gas entry sets up by the front. In order to facilitate the forward discharge of the flue gas from the microwave oven, in the embodiment shown in fig. 4 and 6 to 9, the auxiliary flue gas inlet 33 of the auxiliary flue 3 is communicated with the lower end of the first air inlet channel 22.

In order to reduce the flow loss of the airflow channel 103 caused by the expansion and contraction of the channel as much as possible, the cross-sectional area of the main channel 1 may be set to be equal to the sum of the areas of the first main channel inlet and the second main channel inlet; and/or the cross-sectional area of the main flow channel 1 is equivalent to the sum of the areas of the flue gas inlets 21 of the first air inlet channel 22 and the second air inlet channel 23; and/or the cross-sectional area of the flue gas outlet 11 is equivalent to the sum of the areas of the first main flow channel inlet and the second main flow channel inlet; and/or the cross-sectional area of the flue gas outlet 11 is equivalent to the sum of the areas of the flue gas inlets 21 of the first and second air inlet channels 22 and 23.

The utility model discloses it does not do the restriction to be right the cross sectional shape of airflow duct 103, intake duct 2 and/or the cross-section of sprue 1 is square, circular or oval setting, specifically looks at actual need, in this embodiment, intake duct 2 and/or the cross-section of sprue 1 is roughly square.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An airflow duct installed in an inner wall cavity of a microwave oven, the airflow duct comprising:

2. The airflow channel of claim 1 wherein said inlet channel is disposed at an angle to said main channel, and wherein the intersection of said inlet channel and said main channel is disposed as a curved channel.

3. The airflow duct of claim 2, wherein the inlet channel extends in an up-down direction, a lower port of the inlet channel is the flue gas inlet, and an upper port of the inlet channel is the inlet channel outlet;

4. The airflow duct of claim 3, wherein the primary flow passage includes a front sidewall, a rear sidewall, an upper sidewall, a lower sidewall, and proximal and distal end walls.

5. The airflow duct of claim 4, wherein said flue gas outlet is disposed in said upper sidewall at the intersection of said upper sidewall and said distal wall.

6. The airflow duct of claim 5, wherein the distal wall and the lower sidewall are in a circular arc transition to smoothly guide the airflow in the airflow duct from the distal wall to the smoke outlet; and/or the presence of a gas in the gas,

7. The airflow duct of claim 3, wherein the inlet duct comprises a first inlet duct and a second inlet duct, wherein the flue gas inlets of the first inlet duct and the second inlet duct correspond to a first flue gas inlet and a second flue gas inlet.

8. The airflow duct of claim 7, wherein a connecting plate is connected between the lower end of the first intake duct and the lower end of the second intake duct, the connecting plate is provided with a first connecting hole and a second connecting hole along the vertical direction, and the first flue gas inlet and the second flue gas inlet are correspondingly and fixedly connected to the first connecting hole and the second connecting hole.

9. The airflow duct of claim 7, wherein the first and second air inlets are arranged side-by-side in front-to-back.

10. The airflow channel of claim 9, wherein the first intake duct comprises a first flue gas inlet section and a first connecting section, the first flue gas inlet section and the first connecting section are arranged in sequence from bottom to top, the first flue gas inlet section is arranged in a front-back direction deviating from the main flow channel, the first flue gas inlet section is in smooth transition connection with the first connecting section, and the first connecting section is in smooth transition connection with the main flow channel;

11. The airflow duct of claim 10, wherein, in a front-to-back direction, the first and second flue gas inlets are disposed offset from the respective inlet outlets toward the same side, and the second flue gas inlet is disposed closer to the primary duct inlet.

12. The airflow channel of claim 11, wherein the first and second inlet channels face away from each other in an outer direction and approach each other in an inner direction;

13. The airflow duct of claim 12, wherein the first spline surface has a corresponding spline curve with a tension of T1, the second spline surface has a corresponding spline curve with a tension of T2, the third spline surface has a corresponding spline curve with a tension of T3, and the fourth spline surface has a corresponding spline curve with a tension of T4, wherein T1, T2, T3, and T4 all have values greater than or equal to 0.5 and less than or equal to 1.

14. The airflow channel of claim 7, wherein said primary flow channel comprises a front side wall, a rear side wall, an upper side wall, a lower side wall, and a proximal end wall and a distal end wall, said primary flow channel corresponding to a primary flow channel inlet in communication with said first air inlet channel being a first primary flow channel inlet, said primary flow channel corresponding to a primary flow channel inlet in communication with said second air inlet channel being a second primary flow channel inlet; wherein,

15. The airflow duct of claim 1, further comprising an auxiliary flue, wherein one end of the auxiliary flue is an auxiliary flue gas inlet communicated with the inlet duct, and the other end extends away from the inlet duct to form an auxiliary flue gas outlet.

16. The airflow duct of claim 15, wherein the inlet channel extends in an up-down direction, a lower port of the inlet channel is the flue gas inlet, and an upper port of the inlet channel is the inlet channel outlet;

17. The airflow duct of claim 16, wherein the number of the inlet channels is two, and the inlet channels include a first inlet channel and a second inlet channel, wherein the inlets of the first inlet channel and the second inlet channel correspond to a first flue gas inlet and a second flue gas inlet, the first flue gas inlet and the second flue gas inlet are distributed at an interval in the front-back direction, and the second flue gas inlet is arranged closer to the inlet of the main flow channel in the front-back direction;

18. The airflow duct of claim 1, wherein the cross-sectional area of the primary flow passage is comparable to the sum of the areas of the primary flow passage inlets; and/or the presence of a gas in the gas,

19. The airflow channel of claim 1, wherein the cross section of the inlet channel and/or the main channel is square, circular or elliptical.

20. A microwave oven, comprising:

the airflow duct according to any one of claims 1 to 19, wherein the flue gas inlet and the flue gas outlet are correspondingly communicated with the air inlet and the air outlet, and together form an airflow path; and the number of the first and second groups,

21. The microwave oven as claimed in claim 20, wherein the air inlet duct extends in an up-down direction and is provided between adjacent two side walls of the outer case and the inner case in a left-right direction.

22. The microwave oven according to claim 21, wherein the blower is disposed between the flue gas inlet and the air inlet, and the flue gas inlet is connected to an air outlet end of an outer cover of the blower via a flange device; and/or the presence of a gas in the gas,

23. The microwave oven as claimed in claim 21, wherein the airflow duct further comprises an auxiliary flue, the auxiliary flue extends in an up-down direction, a lower port of the auxiliary flue is an auxiliary flue gas inlet, the auxiliary flue gas inlet is communicated with a lower end of the intake duct, and an upper end of the auxiliary flue is an auxiliary flue gas outlet;