Patent Publication Number: US-2022221162-A1

Title: Embedded microwave oven

Description:
TECHNICAL FIELD 
     The present disclosure relates to a microwave oven, specially to an embedded microwave oven. 
     BACKGROUND 
     The heat generated by the microwave oven itself mainly comes from the magnetron and the power supply. It is necessary to pay attention to the heat dissipation of these two components, otherwise the performance of the microwave oven will be affected and the service life of the microwave oven will easily be reduced. Microwave ovens are divided into countertop microwave ovens and embedded microwave ovens. Among them, the installation method of the embedded microwave oven is to be built in the cabinet, which will not occupy space on the countertop. Since the inside of the cabinet is not in communication with the outside world like the countertop, only the front opening of the cabinet is connected to the outside world, or a hole is opened inside the cabinet in communication with the outside world, which brings new challenges to the heat dissipation of the embedded microwave oven. 
     SUMMARY 
     Accordingly, it is necessary to overcome the shortcomings of the prior art and to provide an embedded microwave oven, which can improve the heat dissipation effect. 
     The technical solution is as follows: an embedded microwave oven includes: a cooker body and a door, wherein the cooker body includes an outer housing and a cooking cavity provided in the outer housing, both the outer housing and the cooker body are provided with an opening corresponding to the door, the door is openably covered the opening, the outer housing includes a bottom cover plate, a first side cover plate and a rear cover plate, the first side cover plate and the rear cover plate are all connected to the bottom cover plate, and at least one of the bottom cover plate, the first side cover plate and the rear cover plate is provided with an air inlet mesh; a front plate arranged in periphery of the opening of the cooking cavity, wherein a bottom of the front plate is provided with a front air exit hole penetrating the front plate, a spacing region is formed between a housing wall of the outer housing and a cavity wall of the cooking cavity, the front air exit hole is in communication with the spacing region, and when the door is closed, the door is attached to the front plate to seal the opening; a first spacing plate connected to a bottom edge of the front plate or to a side edge of the bottom cover plate close to the opening, wherein the first spacing plate is located below the door and a front air outlet is formed between the first spacing plate and a bottom end of the door, a supporting leg protruding downward is provided on a bottom surface of the bottom cover plate, and a supporting surface where the first spacing plate and the supporting leg are placed is provided with a front air inlet; and a radiator fan arranged in a spacing region between the housing wall of the outer housing and the cavity wall of the cooking cavity. 
     When the aforementioned embedded microwave oven is working, under the action of the radiator fan, the outside air enters the air inlet mesh from the front air inlet and enters the spacing region between the housing wall of the outer housing and the cavity wall of the cooking cavity. After the electronic components (such as a variable frequency power supply and a magnetron) are air-cooled, the hot air is discharged from the front air exit holes and the front air outlet. The first spacing plate can prevent the cold air from the front air inlet and the hot air from the front air outlet from mixing with each other, and prevent the hot air from the front air outlet from directly entering the front air inlet and then entering the cooker body, which plays a better role of buffering, that is, the hot air is discharged from the front air outlet and dissipates heat to the outside air, and then enters the cooker body through the front air inlet; in addition, the hot air discharged from the front air outlet can be reflected towards a front upper side of the cooker body through the first spacing plate, so it is not easy to be sucked in by the front air inlet. 
     In an embodiment, a bottom part of the door facing a plate surface of the front plate is provided with a bottom edge notch, and the bottom edge notch and the front air exit hole are arranged oppositely. 
     In an embodiment, two side parts of the door facing the plate surface of the front plate are both provided with a side edge notch, and two side edge notches are in communication with both ends of the bottom edge notch, respectively. 
     In an embodiment, the outer housing further includes a top cover plate arranged on the top of the cooking cavity, the top cover plate is connected to the first side cover plate and the rear cover plate, respectively; a top wall of the cooking cavity is provided with a hot air assembly, the top cover plate covers the hot air assembly, and at least a part of the air discharged by the radiator fan flows through the hot air assembly. 
     In an embodiment, the embedded microwave oven further includes a variable frequency power supply and a magnetron, the top wall of the cooking cavity is provided with a lateral surrounding edge on a side away from the door, the lateral surrounding edge is attached to the top cover plate, and the radiator fan, the variable frequency power supply and the magnetron are all arranged in a spacing region between a rear wall of the cooking cavity and the rear cover plate. 
     In an embodiment, the radiator fan includes a first fan for heat dissipation of the variable frequency power supply and a second fan for heat dissipation of the magnetron; the lateral surrounding edge comprises a main body surrounding edge and an arc-shaped surrounding edge connected to one end of the main body surrounding edge, the arc-shaped surrounding edge is used to guide the air to a spacing region between a side wall of the cooking cavity and the first side cover plate; the top wall of the cooking cavity is also provided with a guiding edge, a ventilation gap is provided between the guiding edge and the other end of the main body surrounding edge, and the guiding edge extends to a middle part of the cooking cavity. 
     In an embodiment, the air inlet mesh includes a side air inlet mesh and a bottom air inlet mesh; the first side cover plate is provided with the side air inlet mesh on one of corner parts thereof close to the rear cover plate and the bottom cover plate, the bottom cover plate is provided with the bottom air inlet mesh on one of corner parts thereof close to the first side cover plate and the rear cover plate; 
     a plane where an air inlet of the first fan is located is arranged obliquely with respect to the bottom cover plate and to face the side air inlet mesh and the bottom air inlet mesh, a plane where an air outlet of the first fan is located is arranged to face the variable frequency power supply, a plane where an air inlet of the second fan is located faces the bottom air inlet mesh or the side air inlet mesh, and a plane where an air outlet of the second fan is located is arranged to face the magnetron. 
     In an embodiment, the rear cover plate is provided with a first rear air inlet mesh at one of corner parts thereof close to the first side cover plate and the bottom cover plate. 
     In an embodiment, the first fan is arranged above the second fan, an included angle between a central axis of the first fan and a central axis of the second fan is A, and A is less than 90°. 
     In an embodiment, the second fan is a turbo fan, an upper surface and a lower surface of the turbo fan are both provided with an air inlet, the lower surface of the turbo fan is connected to a first air guide cover, a top plate of the first air guide cover is provided with a first vent in communication with the air inlet of the lower surface of the turbo fan, a motor of the turbo fan is arranged in the first air guide cover which covers one part of a region of the bottom air inlet mesh, and a projection of the first fan on the bottom cover plate along a vertical direction is located on the other part of the region of the bottom air inlet mesh. 
     In an embodiment, a ventilation gap is provided between the first fan and the second fan. 
     In an embodiment, an outer housing of the variable frequency power supply is provided with a first lateral ventilation channel, the air outlet of the first fan is in communication with one end of the first lateral ventilation channel, an outer wall of the other end of the first lateral ventilation channel is connected to a vertical spacing plate and a lateral spacing plate, the vertical spacing plate and the lateral spacing plate are arranged in periphery of the magnetron, a second vent is provided on the vertical spacing plate, and the air outlet of the second fan is in communication with the second vent. 
     In an embodiment, a power connector of the magnetron is arranged close to the lateral spacing plate; the lateral spacing plate is provided with a third vent corresponding to the power connector of the magnetron, and the third vent is located on a side of the lateral spacing plate close to the vertical spacing plate. 
     In an embodiment, the embedded microwave oven further includes a second air guide cover, a radiator shell of the magnetron is provided with a second lateral ventilation channel, the rear wall of the cooking cavity is provided with a second rear air inlet mesh, the second air guide cover covers the second rear air inlet mesh, the second vent, the second lateral ventilation channel, and an air inlet of the second air guide cover are in communication in sequence. 
     In an embodiment, the air inlet of the second air guide cover is provided with a heat conducting edge, and the heat conducting edge is attached to the magnetron. 
     In an embodiment, the embedded microwave oven further includes a container for placing cooking objects connected to the door, and the door is connected to the side wall of the cooking cavity via a slide rail. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a state in which an embedded microwave oven is placed inside a cabinet according to an embodiment of the present disclosure; 
         FIG. 2  is a perspective view of the embedded microwave oven according to an embodiment of the present disclosure; 
         FIG. 3  is an enlarged schematic view of  FIG. 2  at location M; 
         FIG. 4  is a schematic structural view of the embedded microwave oven in a perspective according to an embodiment of the present disclosure, with a first side cover plate removed; 
         FIG. 5  is an enlarged schematic view of  FIG. 4  at location N; 
         FIG. 6  is a schematic structural view of the embedded microwave oven in a side perspective according to an embodiment of the present disclosure; 
         FIG. 7  is a schematic view of the internal structure of the embedded microwave oven according to an embodiment of the present disclosure; 
         FIG. 8  is a schematic structural view of the embedded microwave oven in a perspective according to an embodiment of the present disclosure, with an outer housing removed; 
         FIG. 9  is a schematic structural view of the embedded microwave oven in another perspective according to an embodiment of the present disclosure, with an outer housing removed; 
         FIG. 10  is a schematic structural view of the embedded microwave oven according to an embodiment of the present disclosure, with a rear cover plate removed; 
         FIG. 11  is a schematic structural view of the embedded microwave oven in a perspective according to an embodiment of the present disclosure, with a rear cover plate and a first side cover plate removed; 
         FIG. 12  is a schematic structural view of the embedded microwave oven in another perspective according to an embodiment of the present disclosure, with a rear cover plate and a first side cover plate removed; 
     
    
    
     DESCRIPTION OF REFERENCE SIGNS 
       10 -cooker body;  11 -outer housing;  111 -bottom cover plate;  1111 -bottom air inlet mesh;  1112 -supporting leg;  112 -first side cover plate;  1121 -side air inlet mesh;  113 -rear cover plate;  1131 -first rear air inlet mesh;  114 -top cover plate;  115 -second side cover plate;  12 -cooking cavity;  121 -second rear air inlet mesh;  13 -front air outlet;  14 -front air inlet;  20 -door;  21 -bottom edge notch;  211 -inclined wall;  22 -side edge notch;  30 -front plate;  31 -front air exit hole;  40 -first spacing plate;  51 -first fan;  511 -central axis;  52 -second fan;  521 -central axis;  522 -fan motor;  53 -ventilation gap;  60 -variable frequency power supply;  61 -outer housing;  70 -magnetron;  71 -power connector;  72 -radiator shell;  80 -hot air assembly;  81 -heating tube;  82 -heat stirring fan;  83 -hot air motor;  91 -control box;  92 -lateral surrounding edge;  921 -main body surrounding edge;  922 -arc-shaped surrounding edge;  93 -guide edge;  94 -ventilation gap;  95 -barrier;  96 -first air guide cover;  961 -baffle;  962 -mounting plate;  97 -vertical spacing plate;  971 -second vent;  98 -lateral spacing plate;  981 -third vent;  99 -second air guide cover;  991 -heat conducting edge;  200 -cabinet;  210 -supporting surface. 
     DETAILED DESCRIPTION 
     In order to make the aforementioned objectives, features and advantages of the present disclosure more obvious and understandable, the specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the following description, many specific details are explained in order to fully understand the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present disclosure. Therefore, the present disclosure is not limited by the specific embodiments disclosed below. 
     In the description of the present disclosure, it should be understood that the terms “first” and “second” are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include at least one of the features. In the description of the present disclosure, “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined. 
     In the description of the present disclosure, it can be understood that, when an element is considered to be “connected” to another element, it can be directly connected to another element or indirectly connected to another element with a mediating element. In contrast, when an element is described to be “directly” connected to another element, there are no intermediate components. 
     In an embodiment, please refer to  FIGS. 1 to 7 . An embedded microwave oven includes a cooker body  10 , a door  20 , a front plate  30 , a first spacing plate  40  and a radiator fan. The cooker body  10  includes an outer housing  11  and a cooking cavity  12  arranged in the outer housing  11 . Both the outer housing  11  and the cooking cavity  12  are provided with an opening corresponding to the door  20 , the door  20  is openably covered the opening, and the outer housing  11  includes a bottom cover plate  111 , a first side cover plate  112  and a rear cover plate  113 . The first side cover plate  112  and the rear cover plate  113  are all connected to the bottom cover plate  111 , and at least one of the bottom cover plate  111 , the first side cover plate  112  and the rear cover plate  113  is provided with an air inlet mesh. 
     The front plate  30  is arranged in periphery of the opening of the cooking cavity  12 , and a bottom of the front plate  30  is provided with a front air exit hole  31  penetrating the front plate  30 . A spacing region is formed between a housing wall of the outer housing  11  and a cavity wall of the cooking cavity  12 , the front air exit hole  31  are in communication with the spacing region, and when the door  20  is closed, the door  20  is attached to the front plate  30  to seal the opening. Specifically, a spacing region formed between the first side cover plate  112  and the cavity wall of the cooking cavity  12  is in communication with the front air exit hole  31 . 
     The first spacing plate  40  is connected to a bottom edge of the front plate  30  or to a side edge of the bottom cover plate  111  close to the opening. The first spacing plate  40  is located below the door  20  and a front air outlet  13  is formed between the first spacing plate  40  and a bottom end of the door  20 . A supporting leg  1112  protruding downward is provided on a bottom surface of the bottom cover plate  111 , and a supporting surface  210  (i.e. the bottom wall of the cabinet  200 ) on which the first spacing plate  40  and the supporting leg  1112  are placed is provided with a front air inlet  14 . The radiator fan is arranged in a spacing region between the housing wall of the outer housing  11  and the cavity wall of the cooking cavity  12 . 
     When the aforementioned embedded microwave oven is working, under the action of the radiator fan, the outside air enters the air inlet mesh from the front air inlet  14  and enters the spacing region between the housing wall of the outer housing  11  and the cavity wall of the cooking cavity  12 . After the electronic components (such as a variable frequency power supply  60  and a magnetron  70 ) are air-cooled, the hot air is discharged from the front air exit hole  31  and the front air outlet  13 . The first spacing plate  40  can prevent the cold air from the front air inlet  14  and the hot air from the front air outlet  13  from mixing with each other, and prevent the hot air from the front air outlet  13  from directly entering the front air inlet  14  and then entering the cooker body  10 , which plays a better role of buffering, that is, the hot air is discharged from the front air outlet  13  and dissipates heat to the outside air, and then enters the cooker body  10  through the front air inlet  14 ; in addition, the hot air discharged from the front air outlet  13  can be reflected towards a front upper side of the cooker body  10  through the first spacing plate  40 , so it is not easy to be sucked in by the front air inlet  14 . 
     Further, referring to  FIGS. 4 to 7 , a bottom part of the door  20  facing a plate surface of the front plate  30  is provided with a bottom edge notch  21 , and the bottom edge notch  21  and the front air exit hole  31  are arranged oppositely. In this way, the hot air discharged from the front air exit hole  31  can be buffered at the bottom edge notch  21 , and then discharged into the outside air of the cooker body  10 , that is, the area of the air outlet at a most terminal can be increased, and the air outlet speed can be increased. Specifically, in order to achieve a better buffering and diversion effect of the bottom edge notch  21 , the notch wall of the bottom edge notch  21  is an oblique wall  211  arranged obliquely with respect to the air outlet direction of the front air exit hole  31 . 
     Specifically, there may be multiple front air exit holes  31  and they are located at the bottom part of the front plate  30 . 
     Further, referring to  FIGS. 4 to 7 , two side parts of the door  20  facing the plate surface of the front plate  30  are both provided with a side edge notch  22 , and two side edge notches  22  are in communication with both ends of the bottom edge notch  21 , respectively. In this way, the hot air discharged from the front air exit holes  31  can be buffered at the bottom edge notch  21 , and further can be buffered at the side edge notch  22 , and then discharged to the outside air of the cooker body  10 , which can increase the area of the air outlet at a most terminal and increases the air outlet speed. In addition, a spacing is provided between the bottom wall of the side edge notch  22  and the front plate  30 , which is not only used to form a buffer channel for hot air, but also can be used as a handle for opening the door of the embedded microwave oven. 
     Further, referring to  FIGS. 4 to 7 , the outer housing  11  further includes a top cover plate  114  disposed on the top of the cooking cavity  12 , the top cover plate  114  is connected to the first side cover plate  112  and the rear cover plate  113 . A hot air assembly  80  is provided on a top wall of the cooking cavity  12 , the top cover plate  114  covers the hot air assembly  80 , and at least a part of the air discharged by the radiator fan flows through the hot air assembly  80 . In this way, the cold air outside the cooker body  10  sucked by the radiator fan flows through some electronic components (the variable frequency power supply  60  and the magnetron  70 ), then flows through the hot air assembly  80  at the top of the cooking cavity  12 , then flows into the spacing region between a side wall of the cooking cavity  12  and the first side cover plate  112 , and finally is discharged into the external environment of the cooker body  10  through the front air exit holes  31  and the front air outlet  13  of the front plate  30 . In this way, the cold air entering the cooker body  10  not only dissipates heat for the variable frequency power supply  60  and the magnetron  70 , but also dissipates heat for the hot air motor  83 , which can prevent heat from accumulating on the top of the cooker body  10  and affecting a control box  91  besides the hot air assembly  80 . Specifically, the control box  91  is arranged on a side of the top cover plate  114  close to the door  20  to facilitate the operation of the control box  91 . Of course, the control box  91  can also be arranged at other positions on the top cover plate  114 . 
     It should be noted that, referring to  FIGS. 7 and 8 , the hot air assembly  80  includes a heating tube  81 , a heat stirring fan  82  with metal fan blades, and a hot air motor  83  that drives the heat stirring fan  82 . 
     Further, referring to  FIGS. 10 to 12 , the embedded microwave oven further includes a variable frequency power supply  60  and a magnetron  70 . The top wall of the cooking cavity  12  is provided with a lateral surrounding edge  92  on a side thereof away from the door  20 , wherein the lateral surrounding edge  92  is attached to the top cover plate  114 . The radiator fan, the variable frequency power supply  60  and the magnetron  70  are all arranged in a spacing region between a rear wall of the cooking cavity  12  and the rear cover plate  113 . In this way, the lateral surrounding edge  92  separates the hot air assembly  80  from the variable frequency power supply  60  and the magnetron  70 , which can prevent the heat generated by the hot air assembly  80  from jumping to the variable frequency power supply  60  and the magnetron  70  behind the lateral surrounding edge  92 , thereby affecting the normal operation of the variable frequency power supply  60  and the magnetron  70 . 
     Further, referring to  FIGS. 11 and 12 , the radiator fan includes a first fan  51  for heat dissipation of the variable frequency power supply  60  and a second fan  52  for heat dissipation of the magnetron  70 . The lateral surrounding edge  92  includes a main body surrounding edge  921  and an arc-shaped surrounding edge  922  connected to one end of the main body surrounding edge  921 . The arc-shaped surrounding edge  922  is used to guide the air to the spacing region between the side wall of the cooking cavity  12  and the first side cover plate  112 . The top wall of the cooking cavity  12  is also provided with a guiding edge  93 , a ventilation gap  94  is provided between the guiding edge  93  and the other end of the main body surrounding edge  921 , and the guiding edge  93  extends towards a middle part of the cooking cavity  12 . In this way, the air blown by the first fan  51  dissipates heat for the variable frequency power supply  60 , and the air blown by the second fan  52  dissipates heat for the magnetron  70 , which has a better heat dissipation effect. In addition, a part of the air discharged by the radiator fan flows along the lateral surrounding edge  92  and enters the spacing region between the side wall of the cooking cavity  12  and the first side cover plate  112 , and then exits from the front air exit holes  31  and the front air outlet  13  of the front plate  30 ; the other part of the air discharged by the radiator fan enters the top of the cooking cavity  12  via the ventilation gap  94 , and then flows through the hot air assembly  80  and enters the spacing region between the side wall of the cooking cavity  12  and the first side cover plate  112 , and is also discharged from the front air exit holes  31  and the front air outlet  13  of the front plate  30  in sequence. 
     Further, referring to  FIGS. 9 to 12 , the air inlet mesh includes a side air inlet mesh  1121  and a bottom air inlet mesh  1111 . The first side cover plate  112  is provided with the side air inlet mesh  1121  on one of corner parts thereof close to the rear cover plate  113  and the bottom cover plate  111 , the bottom cover plate  111  is provided with the bottom air inlet mesh  1111  on one of corner parts thereof close to the first side cover plate  112  and the rear cover plate  113 . A plane where an air inlet of the first fan  51  is located is arranged obliquely with respect to the bottom cover plate  111  and to face the side air inlet mesh  1121  and the bottom air inlet mesh  1111 , a plane where the air outlet of the first fan  51  is located is arranged to face the variable frequency power supply  60 , a plan where an air inlet of the second fan  52  is located faces the bottom air inlet mesh  1111  or the side air inlet mesh  1121 , and a plane where an air outlet of the second fan  52  is located is arranged to face the magnetron  70 . In this way, on the one hand, the first fan  51  draws in the air outside the cooker body  10  through the side air inlet mesh  1121  and the bottom air inlet mesh  1111 , and blows it to the variable frequency power supply  60  for heat dissipation. The large amount of air entering has a good heat dissipation effect on the variable frequency power supply  60 , the second fan  52  draws in the air outside the cooker body  10  through the bottom air inlet mesh  1111  or the side air inlet mesh  1121 , and blows it to the magnetron  70  for heat dissipation, which achieves a good heat dissipation effect of the magnetron  70 ; on the other hand, the occupation space of the first fan  51  in a horizontal direction can be reduced to a certain extent compared to a horizontal arrangement because a plane of the air inlet of the first fan  51  is arranged obliquely with respect to the bottom cover plate  111 , which can increase the volume of the cooking cavity  12  while reducing the heat dissipation effect. 
     Specifically, in order to prevent hot air entering the spacing region between the side wall of the cooking cavity  12  and the first side cover plate  112  from being sucked into the radiator fan, a barrier  95  is provided in a position which is in the spacing region between the side wall of the cooking cavity  12  and the first side cover plate  112  and is close to the rear wall of the cooking cavity  12 . 
     Further, referring to  FIGS. 9 to 12 , the rear cover plate  113  is provided with a first rear air inlet mesh  1131  at one of corner parts thereof close to the first side cover plate  112  and the bottom cover plate  111 . In this way, when the first fan  51  and the second fan  52  work, the outside air of the cooker body  10  can also enter the cooker body  10  through the first rear air inlet mesh  1131  to increase the air intake quantity and ensure better heat dissipation effect. 
     Further, referring to  FIGS. 9 to 12 , the first fan  51  is arranged above the second fan  52 , and an included angle between a central axis  511  of the first fan  51  and a central axis  521  of the second fan  52  is A, and A is less than 90°. It should be explained that the central axis  511  of the first fan  51  refers to an axis line perpendicular to the plane where the air inlet of the first fan  51  is located, and the central axis  521  of the second fan  52  refers to an axis line perpendicular to the plane where the air inlet of the second fan  52  is located. Specifically, the included angle A between the central axis  511  of the first fan  51  and the central axis  521  of the second fan  52  is 30°˜40°, preferably, A is 36°. 
     Further, the second fan  52  is a turbo fan, an upper surface and a lower surface of the turbo fan are both provided with air inlets, the lower surface of the turbo fan is connected to a first air guide cover  96 , a top plate of the first air guide cover  96  is provided with a first vent in communication with an air inlet of the lower surface of the turbo fan, a motor of the turbo fan is arranged in the first air guide cover  96 , the first air guide cover  96  covers one part of a region of the bottom air inlet mesh  1111 , and a projection of the first fan  51  on the bottom cover plate  111  along a vertical direction is located on the other part of the region of the bottom air inlet mesh. In this way, the first air guide cover  96  can divide the air entering the outer housing  11  from the bottom air inlet mesh  1111  into two independently isolated air, one of which is sucked in through the air inlet of the first fan  51 , and the other of which is sucked in through the air inlet of the second fan  52 , and the two air flow will not be chaotic and partially offset, which improves the utilization rate of cold air and ensures the heat dissipation effect; in addition, the fan motor  522  of the turbo fan is arranged in the first air guide cover  96 , and the air flows entering the first air guide cover  96  has a heat dissipation effect on the fan motor  522 , so that the service life of the fan motor  522  is prolonged. 
     Specifically, referring to  FIGS. 9 to 12 , the first air guide cover  96  includes two baffles  961  arranged at intervals and a mounting plate  962  connecting the two baffles  961 . The first vent is formed on the mounting plate  962 . The baffle  961  is connected to the rear wall of the cooking cavity  12  and the rear cover plate  113  respectively. The motor of the second fan  52  is arranged between the two baffles  961 . The region between the two baffles  961  is opposite to the first rear air inlet mesh  1131  of the rear cover plate  113 , and the outside air can enter between the two baffles  961  through the first rear air inlet mesh  1131 . In addition, the mounting plate  962  is opposite to the bottom air inlet mesh  1111  of the bottom cover plate  111 , and the outside air can also enter the first air guide cover  96  through the bottom air inlet mesh  1111 . 
     Further, referring to  FIGS. 9 to 12 , a ventilation gap  53  is provided between the first fan  51  and the second fan  52 . In this way, a part of the air enters the first air guide cover  96  through the bottom air inlet mesh  1111  and enters the air inlet on the lower surface of the second fan  52 , and the other part enters the outer housing  11  through the bottom air inlet mesh  1111  and the side air inlet mesh  1121 , and then enters the air inlet on the upper surface of the second fan  52  from the ventilation gap  53  between the first fan  51  and the second fan  52 , thereby increasing the cold air intake quantity of the second fan  52 , so as to have a better heat dissipation effect. 
     Further, referring to  FIGS. 9 to 12 , the outer housing  61  of the variable frequency power supply  60  is provided with a first lateral ventilation channel, and the air outlet of the first fan  51  is in communication with one end of the first lateral ventilation channel, an outer wall of the other end of the first lateral ventilation channel is connected to a vertical spacing plate  97  and a lateral spacing plate  98 . The vertical spacing plate  97  and the lateral spacing plate  98  are arranged in periphery of the magnetron  70 , the vertical spacing plate  97  is provided with a second vent  971 , and the air outlet of the second fan  52  is in communication with the second vent  971 . In this way, on the one hand, the cold air sent from the air outlet of the first fan  51  enters the first lateral ventilation channel to achieve better heat dissipation of the variable frequency power supply  60 ; on the other hand, under the action of the vertical spacing plate  97  and the lateral spacing plate  98 , the two air flows will not be chaotic and partially offset, which improves the utilization rate of the cold air and ensures the heat dissipation effect. 
     Further, the lateral spacing plate  98  is connected to the rear wall of the cooking cavity  12  and the rear cover plate  113  respectively. Similarly, the vertical spacing plate  97  is connected to the rear wall of the cooking cavity  12  and the rear cover plate  113  respectively. 
     Further, referring to  FIGS. 9 to 12 , a power connector  71  of the magnetron  70  is provided adjacent to the lateral spacing plate  98 . The lateral spacing plate  98  is provided with a third vent  981  corresponding to the power connector of the magnetron  70 , and the third vent  981  is located on a side of the lateral spacing plate  98  close to the vertical spacing plate  97 . In this way, after the cold air of the first fan  51  flows out through the first lateral ventilation channel, a part of the air flows into the space region where the magnetron  70  is located through the third vent  981 , and flows into the region where the magnetron  70  is located from top to bottom, so as to be in full heat exchange contact with the magnetron  70 , which can better reduce the temperature of the magnetron  70 . In addition, it is possible to avoid whirling air in the region where the magnetron  70  is located. 
     Further, referring to  FIGS. 9 to 12 , the embedded microwave oven further includes a second air guide cover  99 . The radiator shell  72  of the magnetron  70  is provided with a second lateral ventilation channel, the rear wall of the cooking cavity  12  is provided with a second rear air inlet mesh  121 , and the second air guide cover  99  covers the second rear air inlet mesh  121 , the second vent  971 , the second lateral ventilation channel, and an air inlet of the second air guide cover  99  are in communication in sequence. In this way, the cold air from the second fan  52  enters the second air guide cover  99  through the second vent  971  and the second lateral ventilation channel, and then enters the cooking cavity  12  through the second rear air inlet mesh  121 . 
     Further, referring to  FIGS. 9 to 12 , the air inlet of the second air guide cover  99  is provided with a heat conducting edge  991 , and the heat conducting edge  991  is attached to the magnetron  70 . Specifically, the heat conducting edge  991  is attached to the radiator shell  72  of the magnetron  70 , and the heat of the radiator shell  72  of the magnetron  70  is conducted to the second air guide cover  99  according to the heat conduction principle, which improves the heat dissipation effect of the magnetron  70 . 
     In a specific embodiment, referring to  FIGS. 9 to 12 , a power connector  71  of the magnetron  70  is arranged close to the lateral spacing plate  98 , the lateral spacing plate  98  is provided with a third vent  981  corresponding to the power connector of the magnetron  70 , and the third vent  981  is located on a side of the lateral spacing plate  98  close to the vertical spacing plate  97 . The embedded microwave oven further includes a second air guide cover  99 , the radiator shell  72  of the magnetron  70  is provided with a second lateral ventilation channel, the rear wall of the cooking cavity  12  is provided with a second rear air inlet mesh  121 , the second air guide cover  99  covers the second rear air inlet mesh  121 , the second vent  971 , the second lateral ventilation channel, and the air inlet of the second air guide cover  99  are in communication in sequence. In this way, when only the air blown by the second fan  52  is contained in the second air guide cover  99 , whirling air is easily generated in the second air guide cover  99 , and after the third vent  981  is provided on the lateral spacing plate  98 , the air blown by the first fan  51  can enter the region where the magnetron  70  is located from top to bottom through the third vent  981 , and enters the second air guide cover  99 , which helps to avoid the generation of whirling air and at the same time to have a better heat dissipation effect on the magnetron  70 . 
     Further, the drawer-type microwave oven further includes a container connected to the door  20  for placing cooking objects, and the door  20  is connected to the side wall of the cooking cavity  12  via a slide rail. 
     Further, referring to  FIGS. 9 to 12 , the outer housing  11  further includes a second side cover plate  115 . The second side cover plate  115  is arranged opposite to the first side cover plate  112 , and the second side cover plate  115  is connected to the rear cover plate  113  and the bottom cover plate  111 , respectively. The three side edges of the top cover plate  114  are connected to the first side cover plate  112 , the rear cover plate  113  and the second side cover plate  115 , respectively. 
     The technical features of the embodiments described above may be arbitrarily combined. For the sake of brevity of description, not all possible combinations of the technical features in the aforementioned embodiments are described. However, as long as there is no contradiction between the combinations of these technical features, all should be considered as the scope of this specification. 
     The aforementioned examples only express several implementation of the present disclosure, and the descriptions thereof are more specific and detailed, but they cannot be understood as a limitation on the scope of the present disclosure. It should be noted that, for those who skilled in the art, a plurality of modifications and improvements can be made without departing from the concept of the present disclosure, which all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the appended claims.