A drawer-type double-layer combined kitchen appliance

Abstract

The utility model belongs to kitchen electrical appliances technical field, especially point to a drawer type double -deck combination kitchen electrical appliances, it includes frame, first equipment and second equipment, second equipment includes: the machine case has the inner bag and the shell, the door device has the drawer storage frame, the door body and the side connecting piece, this side connecting piece is installed in the machine case through the slide rail assembly respectively, and the drawer opening and closing device, it includes: synchronous belt assembly has the driving wheel, the driven wheel and sets up between both the synchronous belt, motor is used for driving the driving wheel rotation, and the linkage piece, one end is fixed on the synchronous belt, the other end is fixed on the side connecting piece, the synchronous belt drives the side connecting piece to do linear reciprocating motion through the linkage piece. The utility model's drawer opening and closing device adopts the synchronous belt to carry out rotation, it has the low noise, low vibration, transmission precision etc. advantage, can improve the moving precision of drawer, stability and reduce the noise of drawer opening and closing device operation.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically referring to a drawer-type double-layer combination kitchen appliance. Background Technology

[0002] Traditional microwave ovens consist of a casing, a microwave generator located on the side wall, and a rotating door at the front. The casing is relatively deep, with an internal turntable, typically for horizontal placement of plates, which is inconvenient for large plates. Furthermore, opening the door requires sufficient space in front of the microwave, and when placed on the lower shelf of a double-layered kitchen appliance, users need to squat or bend over to operate it, making it unsuitable for small kitchens or modern minimalist kitchen designs. To address this, drawer-type microwave ovens have emerged, consisting of a casing and a pull-out drawer. When the drawer is open, users can directly access plates vertically, allowing for installation under low cabinets or countertops, facilitating the placement of large plates with less effort. However, most drawer-type opening mechanisms are not stable, resulting in issues such as high noise levels, low control precision, and inconvenient installation.

[0003] Furthermore, the microwaves generated by the microwave generator are repeatedly reflected within the metal cavity of the casing, forming a complex electromagnetic field distribution. This electromagnetic field can cause polar molecules such as water molecules in food to vibrate at high speeds, generating heat through intermolecular friction, thus achieving rapid heating from the inside out. However, because the drawer structure occupies a portion of the side area, the microwaves emitted by the microwave generator are easily interfered with by the drawer, affecting the efficiency of microwave heating.

[0004] Furthermore, microwave ovens, due to the limitations of their heating principle, cannot achieve a crispy surface on food, making them unsuitable for cooking that requires a baking effect. While ovens use radiant and convection heating to achieve ideal baking results, they suffer from lower heating efficiency, especially for large pieces of food, often resulting in over-charred surfaces while the inside remains uncooked. Utility Model Content

[0005] The purpose of this utility model is to provide a drawer-type double-layer combination kitchen appliance that is simple in structure, low in noise, easy to use, and offers a variety of cooking methods.

[0006] The purpose of this utility model is achieved as follows:

[0007] A drawer-type double-layer combination kitchen appliance includes: a frame; a first device mounted on top of the frame; and a second device mounted below the frame. The second device includes: a housing having an inner liner and a shell surrounding the inner liner; a door assembly having a drawer storage frame located within the inner liner, a door sealing the inner liner, and side connectors mounted on the left and right sides of the door, the side connectors being mounted within the housing via slide rail assemblies; and a drawer opening / closing device located on one side of the housing for driving the door assembly to open and close. The drawer opening / closing device includes: a timing belt assembly having a drive wheel, a driven wheel, and a timing belt disposed between them; a motor for driving the drive wheel to rotate; and a linkage, one end fixed to the timing belt and the other end fixed to the side connectors; the timing belt drives the side connectors to perform linear reciprocating motion via the linkage.

[0008] Preferably, the linkage component includes a linkage plate and a fixing block. The linkage plate has a first fixing part connected to the timing belt and a second fixing part connected to the side connector. The first fixing part is fixed to the timing belt by the fixing block.

[0009] Preferably, the top of the inner liner is provided with an inner liner microwave inlet and a stirring cavity communicating with the inner liner microwave inlet; the second device further includes a microwave generating device, installed on the top of the chassis, which includes: a microwave generating mechanism for generating microwaves; a waveguide box having a waveguide inlet connected to the microwave generating mechanism and a waveguide outlet connected to the inner liner microwave inlet for introducing microwaves into the stirring cavity; and a stirring mechanism, installed on the waveguide box, having a stirring motor, a stirring shaft and a stirring plate located in the stirring cavity, wherein the stirring motor drives the stirring plate to rotate through the stirring shaft.

[0010] Preferably, the waveguide box includes an upper waveguide box body and a lower waveguide box body, which are fixed by welding along their edges; a tuning rod is provided on the upper waveguide box body.

[0011] Preferably, the microwave generating device further includes a microwave heat dissipation mechanism, which has a microwave heat dissipation shell and a microwave heat dissipation fan. The microwave heat dissipation shell is provided with a microwave air inlet, a microwave heat dissipation channel and a microwave air outlet connected in sequence. The microwave air outlet is connected to the outer shell exhaust hole of the outer shell. The microwave heat dissipation fan is located in the microwave heat dissipation channel. The microwave generating mechanism includes a frequency converter and a magnetron installed in the microwave heat dissipation channel.

[0012] Preferably, the second device further includes a top heating mechanism, which is a top electric heating tube, and a recessed part is provided in the middle of the top electric heating tube to avoid microwaves; the microwave generator and the stirring cavity are both located at the top of the inner liner, and the recessed part is located directly below the stirring cavity.

[0013] Preferably, the second device further includes a back heating mechanism, which includes a back heating tube, a circulating fan, and a heating tube baffle. A back heating cavity is formed between the heating tube baffle and the back plate of the inner liner. The back heating cavity is equipped with a back heating tube and a circulating fan. The position of the heating tube baffle corresponding to the circulating fan is provided with a plurality of first vent holes, and the position of the heating tube baffle corresponding to the back heating tube is provided with a plurality of second vent holes.

[0014] Preferably, the first device includes: an inner casing having a baking cavity; and an outer casing disposed on the outer periphery of the inner casing.

[0015] A door-opening device is installed on the front side of the outer casing to seal the baking cavity; a baking device is installed on the inner casing to heat the food in the baking cavity; and an oven heat dissipation device includes an oven heat dissipation channel and an oven heat dissipation fan installed in the oven heat dissipation channel; wherein, the oven heat dissipation channel includes an upper heat dissipation channel installed above the inner casing, a rear heat dissipation channel installed on the back of the inner casing, and a lower heat dissipation channel installed below the inner casing, and the upper end of the front shell plate of the outer casing has at least one air inlet hole connected to the upper heat dissipation channel, and the lower end of the front shell plate of the outer casing has at least one air outlet hole connected to the lower heat dissipation channel.

[0016] Preferably, the air inlet includes a first air inlet and a second air inlet that connect to the outside, with the first air inlet located above the second air inlet; the flip-door device is provided with a door heat dissipation duct and a door air intake and a door air outlet that connect to the door heat dissipation duct, with the door air intake located at the bottom or left and right sides of the flip-door device, and the door air outlet located at the upper inner side of the flip-door device; when the flip-door device is closed, the door air outlet faces the second air inlet, so that the door heat dissipation duct connects to the oven heat dissipation channel.

[0017] Preferably, a heat dissipation baffle is provided on the upper part of the inner casing, and an upper heat dissipation channel is provided between the heat dissipation baffle and the top shell plate of the outer casing; a mounting baffle is provided on the back of the inner casing, and a rear heat dissipation channel is provided between the mounting baffle and the back shell plate of the outer casing; a heat insulation baffle is provided at the lower part of the inner casing, and a lower heat dissipation channel is provided between the heat insulation baffle and the bottom shell plate of the outer casing.

[0018] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0019] 1. The drawer opening and closing device of this utility model uses a synchronous belt for rotation, which has the advantages of low noise, low vibration and high transmission accuracy, and can improve the moving accuracy and stability of the drawer and reduce the noise of the drawer opening and closing device.

[0020] 2. The connection structure of the linkage and synchronous belt in this utility model can prevent slippage, making the transmission more reliable and precise; at the same time, it will not damage the synchronous belt.

[0021] 3. The microwave generator of this invention is located at the top of the inner liner. Microwaves enter the food heating cavity from top to bottom, and in conjunction with the drawer-type door device, heat the food, resulting in better heating effect. Furthermore, the microwave generator and the electric heating device can work independently or alternately. The microwave generator is used for rapid internal heating, while the electric heating device is used for baking and cooking, making the food surface crispy. This operating mode can meet more of the user's cooking needs, shorten cooking time, and improve cooking efficiency.

[0022] 4. The microwave generating device of this utility model includes a microwave generating mechanism, a waveguide box, and a stirring mechanism, which can more evenly introduce microwaves into the food heating cavity of the inner pot, improving the efficiency of microwave heating. At the same time, the stirring mechanism drives the stirring shaft to rotate through the first driving component and the second driving component, which can overcome the coaxial error between the stirring motor and the stirring shaft, reducing the manufacturing difficulty.

[0023] 5. The waveguide box of this utility model is welded together from an upper waveguide box body and a lower waveguide box body, which can reduce the risk of leakage at the connection point; at the same time, a tuning rod is provided on the upper waveguide box body, which can ensure the transmission efficiency of microwaves.

[0024] 6. The electric heating device of this utility model includes a top heating mechanism and a back heating mechanism. Combined with a microwave generator, it can heat food in different ways. The back heating mechanism can also achieve an air-frying function, meeting more of the user's cooking needs. Meanwhile, the top heating element is U-shaped, with a recessed area in the middle to avoid microwaves, which helps improve microwave heating efficiency. Attached Figure Description

[0025] Figure 1 This is a front structural diagram of the double-layer combined kitchen appliance of this utility model.

[0026] Figure 2 This is a schematic diagram of the back structure of the double-layer combined kitchen appliance of this utility model.

[0027] Figure 3 This is a cross-sectional view of the double-layer combined kitchen appliance of this utility model.

[0028] Figure 4 This is a schematic diagram of the structure of the second device of this utility model, the door removal device.

[0029] Figure 5 yes Figure 3 A magnified view of the central wave-stirring mechanism.

[0030] Figure 6 This is a schematic diagram of the structure of the inner liner of the second device, the microwave generator, and the heat dissipation system of this utility model.

[0031] Figure 7This is a schematic diagram of the structure of the microwave generator of this utility model.

[0032] Figure 8 This is an exploded view of the inner liner, microwave generator, and heat dissipation system of this utility model.

[0033] Figure 9 This is an exploded view of the microwave generator of this utility model.

[0034] Figure 10 This is a cross-sectional view of the microwave generator of this utility model.

[0035] Figure 11 This is a schematic diagram of the wave-stirring mechanism of this utility model.

[0036] Figure 12 This is a structural schematic diagram of the drawer-type door device of this utility model.

[0037] Figure 13 This is one of the installation diagrams for the drawer opening and closing device of this utility model.

[0038] Figure 14 This is one of the installation diagrams for the drawer opening and closing device of this utility model.

[0039] Figure 15 This is a schematic diagram of the structure of the drive-side connector of the drawer opening and closing device of this utility model.

[0040] Figure 16 This is an exploded view of the drawer opening and closing device, the right slide rail assembly, and the side connector of this utility model.

[0041] Figure 17 This is a structural schematic diagram of the linkage component connecting the synchronous belt and the side connector of this utility model.

[0042] Figure 18 This is an exploded view of the linkage component, synchronous belt, and side connector of this utility model.

[0043] The meaning of the labels in the diagram:

[0044] 1. Chassis; 2. Microwave generator; 3. Electric heating device; 4. Door device; 5. Drawer opening and closing device; 6. Slide rail assembly; 7. Decorative panel; 8. Heat dissipation system;

[0045] Inner liner 11; Inner liner microwave inlet 111; Stirring chamber 112; Inner liner vent 113; Outer shell 12; Lock hole 121; Front vertical beam 122; Rear vertical beam 123; Slide rail fixing crossbeam 124; Front panel 125; Connecting crossbeam 126; Outer shell vent 127; Door sealing ring 13; Wave-transparent partition 14;

[0046] Microwave generating mechanism 21; frequency converter 211; magnetron 212; waveguide box 22; waveguide inlet 221; waveguide outlet 222; shaft mounting hole 223; limiting protrusion 2231; upper waveguide box 224; lower waveguide box 225; tuning rod 226; waveguide box fixing seat 227; wave stirring mechanism 23; wave stirring motor 231; wave stirring shaft 232; wave stirring plate 233; first driving component 234; second driving component 235; bushing 236; limiting groove 2361; motor bracket 237; wave stirring plate connecting seat 238; microwave heat dissipation mechanism 24; microwave heat dissipation shell 241; heat dissipation base 2411; first heat dissipation cover 2412; second heat dissipation cover 2413; microwave heat dissipation fan 242; microwave air inlet 243; microwave air outlet 244;

[0047] Top heating mechanism 31; clearance part 311; back heating mechanism 32; back electric heating tube 321; circulating fan 322; electric heating tube baffle 323; first vent 3231; second vent 3232;

[0048] 41. Drawer storage frame; 42. Door body; 43. Side connector; 431. Positioning groove; 432. Second mounting hole; 44. Limiting component; 45. Door lock assembly; 46. Bottom connector; 47. Bottom roller; 48. Side roller; 49. Roller bracket;

[0049] Synchronous belt assembly 51; drive pulley 511; driven pulley 512; synchronous belt 513; pulley mounting base 514; drive pulley mounting slot 5141; driven pulley mounting slot 5142; drive pulley auxiliary mounting bracket 515; bearing 516; stepped nut 517; motor 52; output pulley 521; input pulley 522; output belt 523; motor fixing plate 524; linkage component 53; linkage plate 531; first fixing part 5311; second fixing part 5312; toothed groove 5313; first connecting hole 5314; first mounting hole 5315; positioning protrusion 5316; fixing block 532; second connecting hole 5321; slot 5322; first micro switch 54;

[0050] Left slide rail assembly 61; slide rail 611; slider 612; right slide rail assembly 62; bottom slide rail assembly 633;

[0051] Mounting plate 81; Heat dissipation cover 82; Chassis cooling fan 8;

[0052] Frame 100; First device 200; Second device 300; Main control panel 400;

[0053] Inner casing 1A; Outer casing 2A; Door flipping device 3A; Baking device 4A; Oven heat dissipation device 5A;

[0054] Door ventilation duct 31A; Door air intake 32A; Door air outlet 33A;

[0055] Back airburst device 41A; upper heating device 42A; lower heating device 43A;

[0056] Oven cooling fan 51A; upper cooling channel 52A; rear cooling channel 53A; lower cooling channel 54A; air inlet 55A; air outlet 56A;

[0057] Heat dissipation partition 6A; mounting partition 7A; heat insulation partition 8A. Detailed Implementation

[0058] The present invention will be further described below with reference to specific embodiments:

[0059] like Figure 1 and 2 As shown, a drawer-type double-layer combination kitchen appliance includes a frame 100, a first device 200, and a second device 300. The first device 200 is installed above the frame 100, and the second device 300 is installed below the frame 100.

[0060] In this embodiment, the frame 100 includes a left frame and a right frame, each consisting of a crossbeam and two vertical beams, with the crossbeam fixed to the upper ends of the two vertical beams. The width of the first device 200 is greater than the width of the second device 300, and the first device 200 is located above the second device 300. In this case, the first device 200 is fixed to the crossbeams of the left and right frames, and the second device 300 is installed between the left and right frames, with its left and right sidewalls fixedly connected to the left and right frames, respectively.

[0061] The first device 200 is one of the following: oven, steamer, dishwasher, or sterilizer.

[0062] like Figure 3 As shown, the first device 200 in this embodiment is an oven, which includes an inner shell 1A, an outer shell 2A, a door flipping device 3A, a baking device 4A, and an oven heat dissipation device 5A.

[0063] Both the inner casing 1A and the outer casing 2A are composed of a left shell plate, a right shell plate, a top shell plate, a bottom shell plate, and a back shell plate. The plates of the inner casing 1A are fixed together by welding or integral molding, while the plates of the outer casing 2A are fixed together by snap-fit, screw connection, welding, or integral molding.

[0064] The inner casing 1A has a baking cavity, and an outer casing 2A is provided on the outer periphery of the inner casing 1A. The outer casing 2A also has a front casing plate, which is located on the front side of the inner casing 1A and has an opening communicating with the baking cavity. A hinged door device 3A is provided on the front side of the front casing plate, which is used to seal the baking cavity.

[0065] A baking device 4A is installed on the inner casing 1A for heating food inside the baking cavity. The baking device 4A includes a back air fryer 41A located on the back of the baking cavity (the back shell plate of the inner casing 1A), an upper heating device 42A located at the upper end of the baking cavity, and a lower heating device 43A located below the baking cavity. The upper heating device 42A is an upper heating element, fixed to the upper end of the back shell plate of the inner casing 1A and located below the top shell plate of the inner casing 1A. The lower heating device 43A includes a lower heating element and a heating element mounting plate, with the lower heating element mounted below the bottom shell plate of the inner casing 1A via the heating element mounting plate.

[0066] The oven heat dissipation device 5A includes an oven heat dissipation channel and an oven heat dissipation fan 51A disposed within the oven heat dissipation channel. The oven heat dissipation channel includes an upper heat dissipation channel 52A located above the inner casing 1A, a rear heat dissipation channel 53A located at the back of the inner casing 1A, and a lower heat dissipation channel 54A located below the inner casing 1A. The upper end of the front shell of the outer casing 2A has at least one air inlet 55A connected to the upper heat dissipation channel 52A, and the lower end of the front shell of the outer casing 2A has at least one air outlet 56A connected to the lower heat dissipation channel 54A.

[0067] Specifically, a heat dissipation baffle 6A is provided above the inner casing 1A, and an upper heat dissipation channel 52A is provided between the heat dissipation baffle 6A and the top shell plate of the outer casing 2A; a mounting baffle 7A is provided at the back of the inner casing 1A, and a rear heat dissipation channel 53A is provided between the mounting baffle 7A and the back shell plate of the outer casing 2A; a heat insulation baffle 8A is provided at the bottom of the inner casing 1A, located below the heating element mounting plate to prevent heat from the lower heating device 43A from diffusing downwards, and a lower heat dissipation channel 54A is provided between the heat insulation baffle 8A and the bottom shell plate of the outer casing 2A. The air inlet 55A, upper heat dissipation channel 52A, rear heat dissipation channel 53A, lower heat dissipation channel 54A, and air outlet 56A are sequentially connected. The oven cooling fan 51A is located at the connection between the upper heat dissipation channel 52A and the rear heat dissipation channel 53A.

[0068] The air inlet 55A includes a first air inlet and a second air inlet that connect to the outside. The first air inlet is located above the second air inlet. The door-opening device 3A is provided with a door heat dissipation duct 31A and a door air intake 32A and a door air outlet 33A that connect to the door heat dissipation duct 31A. The door air intake 32A is located at the bottom or left and right sides of the door-opening device 3A, and the door air outlet 33A is located on the upper inner side of the door-opening device 3A. When the door-opening device 3A is closed, the door air outlet 33A faces the second air inlet, so that the door heat dissipation duct 31A connects to the oven heat dissipation channel.

[0069] When the oven cooling fan 51A is working, outside air enters the oven cooling channel directly through the first air inlet, and also enters the oven cooling channel through the door air intake 32A and the door cooling duct 31A. Then it is discharged to the outside through the air outlet 56A. This can cool and dissipate heat from both the door flip-door device 3A and the inner casing 1A.

[0070] A main control panel 400 is also provided above the front shell panel. The main control panel 400 is equipped with a display screen and corresponding buttons. The main control panel 400 is connected to the main control boards of the first device 200 and the second device 300. The main control board of the first device 200 is located in the oven heat dissipation channel and is used to control the operation of the baking device 4A and the oven heat dissipation device 5A. The first air inlet is located in the gap between the main control panel 400 and the door flip device 3A.

[0071] like Figure 4 As shown, the second device 300 in this embodiment is a drawer-type microwave oven, which includes a chassis 1, a microwave generator 2, an electric heating device 3, a door device 4, a drawer opening and closing device 5, and a decorative panel 7.

[0072] The casing 1 includes an inner liner 11 and an outer shell 12 disposed on the outer periphery of the inner liner 11. A component mounting space is formed between the inner liner 11 and the outer shell 12. A food heating chamber is formed inside the inner liner 11.

[0073] Both the inner liner 11 and the outer shell 12 are composed of a left side plate, a right side plate, a top plate, a bottom plate, and a back plate. The plates of the inner liner 11 are fixed together by welding or integral molding, while the plates of the outer shell 12 are fixed together by snap-fit, screw connection, welding, or integral molding. In this embodiment, the left side plate, bottom plate, and right side plate of the inner liner 11 are integrally molded and the top plate and back plate are welded together respectively; the plates of the outer shell 12 are fixed together by screws.

[0074] The inner liner 11 is installed inside the outer shell 12. A front panel 125 is also provided on the front side of the outer shell 12. The center of the front panel 125 is hollowed out and adapted to fit the opening of the inner liner 11. A door sealing ring 13 is installed in the gap between the inner liner 11 and the front panel 125. A door device 4 that mates with the door sealing ring 13 is movably provided on the front side of the front panel 125 and is used to seal the opening of the inner liner 11. A decorative panel 7 is provided on the upper side of the front panel 125. The vent 56A is located in the gap between the decorative panel 7 and the flip door device 3A.

[0075] The inner cavity 11 is equipped with an electric heating device 3 for baking, which includes a top heating mechanism 31 and a back heating mechanism 32.

[0076] like Figure 3As shown, the top heating mechanism 31 is a top heating element installed below the top plate of the inner liner 11. The back heating mechanism 32 includes a back heating element 321, a circulating fan 322, and a heating element baffle 323. The heating element baffle 323 is fixed to the back plate of the inner liner 11, forming a back heating cavity between them. The back heating cavity contains a ring-shaped back heating element 321 and a circulating fan 322. Figure 4 As shown, the circulating fan 322 has several first vent holes 3231 at the position of the heating tube baffle 323 corresponding to the back heating tube 321, and several second vent holes 3232 at the position of the heating tube baffle 323 corresponding to the back heating tube 321. When the back heating tube 321 and the circulating fan 322 are started simultaneously, under the action of the circulating fan 322, the air in the food heating chamber enters the back heating chamber through the first vent holes 3231, and after being heated by the back heating tube 321, it is discharged into the food heating chamber through the second vent holes 3232, thus continuously circulating to heat the food and realizing the air frying function.

[0077] In this embodiment, the structure of the back air-bursting device 41A of the first device 200 and the structure of the back heating mechanism 32 of the second device 300 are basically the same.

[0078] Microwave generator 2 is used to generate microwaves and is disposed in the component mounting space between the top plate of the inner liner 11 and the top plate of the outer shell 12. Specifically, as shown... Figure 5 As shown, the top plate of the inner liner 11 protrudes upward from the center and is provided with an inner liner microwave inlet 111. The inner liner microwave inlet 111 has a circular opening. Below the top plate of the inner liner 11, a wave-transparent baffle 14 is provided to seal the protruding part, thereby forming a stirring cavity 112 that connects the two and the inner liner microwave inlet 111. The wave-transparent baffle 14 is made of non-metallic material, preferably a glass plate or mica sheet, which does not affect the microwave entering the food heating cavity, while isolating the stirring cavity 112 and the food heating cavity to prevent steam during food cooking from entering the microwave generator 2.

[0079] like Figure 6-11 As shown, the microwave generating device 2 includes a microwave generating mechanism 21, a waveguide box 22, a wave stirring mechanism 23, and a microwave heat dissipation mechanism 24.

[0080] The microwave generating mechanism 21 is used to generate microwaves. It includes a frequency converter 211 and a magnetron 212. The microwave emitting end of the magnetron 212 is fixed with a waveguide box 22. The waveguide box 22 has a waveguide inlet 221 connected to the microwave emitting end and a waveguide outlet 222 connected to the microwave inlet 111 of the inner liner, for guiding microwaves into the stirring cavity 112. A stirring mechanism 23 is installed on the waveguide box 22, which has a stirring motor 231, a stirring shaft 232, and a stirring plate 233 located in the stirring cavity 112. The stirring motor 231 drives the stirring plate 233 to rotate through the stirring shaft 232, so that the microwaves enter the food heating cavity of the inner liner 11 more evenly.

[0081] like Figure 9 , 10 As shown, in this embodiment, the waveguide box 22 includes an upper waveguide box 224 and a lower waveguide box 225. The lower waveguide box 225 is L-shaped, with a side wall forming a waveguide inlet 221 and a bottom wall forming a waveguide outlet 222. The side wall and the bottom wall are recessed and stretched to form a slope transition. Both the waveguide inlet 221 and the waveguide outlet 222 are circular opening structures. A stepped cavity is formed inside the upper waveguide box 224, which is welded and fixed to the lower waveguide box 225 through its edge to form an L-shaped waveguide cavity, thereby reducing the risk of leakage. A tuning rod 226 is provided on the upper waveguide box 224. The length of the tuning rod 226 extending into the waveguide cavity is 9mm-13mm. Its function is to change the capacitive reactance in the waveguide box 22 to match the impedance with the microwave generating mechanism 21, thereby effectively eliminating reflected waves and ensuring higher microwave transmission efficiency.

[0082] In addition, the edge of the waveguide box 22 is provided with a first mounting hole and a second mounting hole. The screw can be connected to the microwave transmitter through the first mounting hole, and the screw can be connected to the waveguide box fixing seat 227 on the top of the inner liner 11 through the second mounting hole. The waveguide box fixing seat 227 is fixed at the inner microwave inlet 111 of the inner liner 11.

[0083] like Figure 10 As shown, the waveguide box 22 is provided with a shaft mounting hole 223, which is a shaft seat welded to the upper waveguide box body 224 and is located directly above the waveguide outlet 222.

[0084] like Figure 5 , 9 As shown in Figure 11, the swivel shaft 232 is movably connected to the shaft mounting hole 223 via the bushing 236. The outer end of the bushing 236 is provided with a limiting flange, and the middle side wall is provided with a limiting groove 2361. The shaft mounting hole 223 is provided with a limiting protrusion 2231 that matches the limiting groove 2361, which is used to limit the axial position of the bushing 236.

[0085] A motor bracket 237 is provided on the outer side of the waveguide box 22. A wave stirring motor 231 is fixed on the motor bracket 237. A snap-fit ​​groove is provided on the output shaft of the wave stirring motor 231, and a first driving member 234 is snapped into the snap-fit ​​groove. The first driving member 234 is L-shaped. A second driving member 235 is provided at the upper end of the wave stirring shaft 232. One end of the second driving member 235 is sleeved on the wave stirring shaft 232, and the other end passes through the wave stirring shaft 232 and connects to the other end of the first driving member 234. Preferably, the second driving member 235 is a spring-loaded pin. The wave stirring motor 231 drives the wave stirring shaft 232 to rotate through the first driving member 234 and the second driving member 235. This structure can overcome the coaxiality error between the wave stirring motor 231 and the wave stirring shaft 232, reducing manufacturing difficulty. In addition, the second driving member 235 abuts against the bushing 236 and restricts the downward axial position of the wave stirring shaft 232.

[0086] The lower end of the stirring shaft 232 enters the waveguide cavity, and a stirring plate 233 is fixed thereon via a stirring plate connector 238. The stirring plate 233 has a fan-shaped structure and is located in the stirring cavity 112. It is fixed to the stirring plate connector 238 with screws, and the stirring plate connector 238 is connected to the lower end of the stirring shaft 232 via a fixing pin. Generally, the axial position of the stirring plate connector 238 and the stirring shaft 232 is fixed for the same equipment. However, for different models of equipment, the manufacturer can adjust the height position of the stirring plate 233 in the stirring cavity 112 by changing the relative position of the stirring plate connector 238 and the stirring shaft 232 to achieve a better stirring effect.

[0087] like Figure 9 As shown, the microwave heat dissipation mechanism 24 has a microwave heat dissipation housing 241 and a microwave heat dissipation fan 242. The microwave heat dissipation housing 241 is provided with a microwave air inlet 243, a microwave heat dissipation channel and a microwave air outlet 244 connected in sequence. The microwave air inlet 243 is connected to the component installation space and the microwave air outlet 244 is connected to the housing exhaust hole 127 of the housing 12 (front panel 125). In this embodiment, there are multiple housing exhaust holes 127 and the gap between the door device 4 and the decorative panel 7 is arranged horizontally.

[0088] Specifically, the microwave heat sink housing 241 includes a heat sink base 2411, a first heat sink cover 2412, and a second heat sink cover 2413. The heat sink base 2411 is fixed to the mounting plate 81. The first heat sink cover 2412 and the second heat sink cover 2413 are spliced ​​together and fixed to the heat sink base 2411, thus forming a microwave heat dissipation channel. A microwave heat dissipation fan 242, a frequency converter 211, and a magnetron 212 are sequentially arranged in the microwave heat dissipation channel. The first heat sink cover 2412 covers the magnetron 212, so that the microwave heat dissipation channel is aligned with the heat dissipation airflow of the magnetron 212 itself. At the same time, the first heat sink cover 2412 and the heat sink base 2411 form a microwave air outlet 244, which is connected to the outside through the housing exhaust hole 127. The second heat dissipation cover 2413 covers the microwave cooling fan 242 and the inverter 211, and forms a microwave air inlet 243 that connects to the component mounting space. Under the action of the microwave cooling fan 242, the air in the component mounting space can be discharged to the outside through the microwave air inlet 243, the microwave heat dissipation channel, and the microwave air outlet 244 in sequence, thereby reducing the operating temperature of the inverter 211 and the magnetron 212. It should be noted that the outer casing 12 is provided with heat dissipation holes that connect the outside to the component mounting space, which can ensure that the component mounting space can directly draw air from the outside under negative pressure.

[0089] In addition, the top heating element is made of metal, which increases microwave loss. Therefore, the top heating element in this embodiment is U-shaped, with a recess 311 formed in the middle to avoid microwaves. The recess 311 is located directly below the stirring cavity 112, which helps to improve the heating efficiency of microwaves.

[0090] like Figure 6 As shown, the component installation space also houses a main control board for controlling the microwave generator 2 and the electric heating device 3, and a heat dissipation system 8. The main control board of the second device 300 is used to control the operation of electrical components such as the microwave generator 2, the electric heating device 3, and the drawer opening and closing device 5. The heat dissipation system 8 includes a mounting plate 81 located above the top plate of the inner liner 11, a heat dissipation cover plate 82 located on the mounting plate 81, and a chassis cooling fan 83. A main heat dissipation channel is formed between the heat dissipation cover plate 82 and the mounting plate 81. One end of the main heat dissipation channel has a main heat dissipation inlet connecting to the component installation space, and the other end has a main heat dissipation outlet. The main heat dissipation outlet connects to the outer shell exhaust hole 127 of the outer shell 12 (front panel 125). The chassis cooling fan 83 is installed at the main heat dissipation inlet of the main heat dissipation channel.

[0091] In addition, an inner liner vent 113 is provided at the top plate of the inner liner 11, and the inner liner vent 113 is connected to the main heat dissipation channel through an inner liner vent pipe. The heat dissipation system 8 is used to dissipate heat from the electrical components and the inner liner 11 within the component installation space.

[0092] like Figure 12As shown, the door device 4 has a drawer storage frame 41 located inside the inner liner 11, a door body 42 that seals the inner liner 11, and side connectors 43 respectively installed on the left and right sides of the door body 42. The drawer storage frame 41 and the side connectors 43 are both installed inside the door body 42. The bottom of the drawer storage frame 41 is provided with a food storage board. The food storage board is made of non-metallic material and preferably glass or mica. The side connectors 43 are used to connect to the housing 1.

[0093] The door device 4 is mounted on the housing 1 via slide rail assemblies 6. The slide rail assemblies 6 include a left slide rail assembly 61 and a right slide rail assembly 62. The left slide rail assembly 61 is located between the left side wall (left side plate) of the inner liner 11 and the outer shell 12, and the right slide rail assembly 62 is located between the right side wall (right side plate) of the inner liner 11 and the outer shell 12. A side through hole is provided on the front panel 125 for the side connectors 43 to pass through. The two side connectors 43 are respectively mounted on the left slide rail assembly 61 and the right slide rail assembly 62, allowing the door device 4 to be pulled out and mounted on the housing 1. When the door device 4 is closed, it abuts against the door sealing ring 13, thereby further improving the sealing performance of the inner liner 11.

[0094] Specifically, such as Figure 13 As shown, a front vertical beam 122 and a rear vertical beam 123 are respectively provided on one side of the outer casing 12. The front vertical beam 122 and the rear vertical beam 123 can be separate components or integrally formed on the front panel 125 or part of the back plate of the outer casing 12. In this embodiment, a connecting crossbeam 126 is fixed between the front panel 125 and the back plate of the outer casing 12. The connecting crossbeam 126 is located at the top. The front vertical beam 122 and the rear vertical beam 123 are separate components. The rear vertical beam 123 is fixed to one side of the back plate of the outer casing 12, and the front vertical beam 122 is fixed between the connecting crossbeam 126 and the bottom plate of the outer casing 12. A slide rail fixing crossbeam 124 for installing the left slide rail assembly 61 or the right slide rail assembly 62 is provided between the front vertical beam 122 and the rear vertical beam 123, such as... Figure 13 As shown. In this embodiment, the mounting structures of the left slide rail assembly 61 and the right slide rail assembly 62 are basically the same and are symmetrically arranged on the left and right sides of the chassis 1.

[0095] The left slide rail assembly 61 or the right slide rail assembly 62 includes a slide rail 611 fixed on the slide rail fixing beam 124 and a slider 612 movably disposed on the slide rail. The slider 612 is fixedly connected to the side connector 43.

[0096] To ensure more stable and reliable movement of the door assembly 4, at least one bottom slide rail assembly 63 is provided between the bottom plate of the inner liner 11 and the outer shell 12, such as... Figure 12 , 13As shown, the bottom slide rail assembly 63 includes a slide rail fixed to the base plate of the housing 12 and a slider movably mounted on the slide rail. The door device 4 also has a bottom connector 46 connected to the bottom slide rail assembly 63. A bottom through hole is provided on the front panel 125 for the bottom connector 46 to pass through. One end of the bottom connector 46 is fixed to the door body 42 below the drawer storage frame 41, and the other end passes through the bottom through hole and is fixed to the slider of the bottom slide rail assembly 63.

[0097] Preferably, such as Figure 12 As shown, roller brackets 49 are respectively provided on the left and right sides of the inner side of the drawer storage frame 41 away from the door body 42. The roller brackets 49 are equipped with bottom rollers 47 for rolling on the bottom plate of the inner liner 11 and / or side wall rollers 48 for rolling on the side plate of the inner liner 11, so that the door device 4 moves more smoothly, which can prevent food and soup from spilling, and at the same time improve the load-bearing capacity of the drawer.

[0098] like Figure 14 As shown, the drawer opening and closing device 5 is located on one side of the housing 1, and is used to drive the door device 4 to open and close via the side connector 43 on one side. The drawer opening and closing device 5 includes a timing belt assembly 51, a motor 52, and a linkage 53.

[0099] like Figure 15 As shown, the synchronous belt assembly 51 has a wheel mounting base 514, a driving pulley 511, a driven pulley 512, and a synchronous belt 513 disposed between the two. The driving pulley 511 and the driven pulley 512 are respectively mounted at both ends of the wheel mounting base 514, and the wheel mounting base 514 is directly fixed to the housing 1. In this embodiment, the wheel mounting base 514 is fixed to the slide rail fixing beam 124.

[0100] In other embodiments, the wheel mounting base 514 may also be fixed between the front vertical beam 122 and the rear vertical beam 123 or between the front panel 125 and the back plate of the housing 12.

[0101] like Figure 16 As shown, the wheel mounting base 514 is a U-shaped profile with a bottom wall and left and right groove walls integrally formed on the left and right sides of the bottom wall. In order to facilitate the installation of the driving wheel 511 and the driven wheel 512, the front end of the left and right groove walls of the wheel mounting base 514 is provided with a driving wheel mounting slot 5141, and the rear end is provided with a driven wheel mounting slot 5142.

[0102] The drive wheel mounting slot 5141 is detachably equipped with a drive wheel auxiliary mounting bracket 515 and a bearing 516 mounted on the drive wheel auxiliary mounting bracket 515. The drive wheel 511 has a drive wheel body and a split drive shaft. The two ends of the drive shaft are mounted on the corresponding bearings 516. The drive wheel 511 is first mounted on the drive wheel auxiliary mounting bracket 515, and then the drive wheel auxiliary mounting bracket 515 is aligned with the drive wheel mounting slot 5141 and mounted on the wheel mounting seat 514. Finally, the two are fixedly connected by screws to realize the detachable connection between the drive wheel auxiliary mounting bracket 515 and the wheel mounting seat 514.

[0103] Driven wheel 512 has a driven wheel body and a driven shaft. Driven wheel mounting slot 5142 has a guide groove that matches the diameter of the driven shaft and a shaft mounting slot with a diameter larger than that of the driven shaft. The guide groove and the shaft mounting slot are interconnected. When the driven shaft enters the shaft mounting slot through the guide groove, a fixing nut is threaded onto both ends of the driven shaft. In this embodiment, the fixing nut is a stepped nut 517, which has a stepped portion that can be inserted into the shaft mounting slot to prevent the driven shaft from disengaging from the driven wheel mounting slot 5142 and to achieve quick installation.

[0104] In another embodiment, one end of one of the driven shafts may be integrally formed with a stepped portion, and the other end of the shaft may be fixedly connected by a stepped nut 51.

[0105] In another embodiment, the driven wheel mounting slot 5142 is a circular driven shaft mounting hole, a bearing is provided in the driven shaft mounting hole, the driven shaft of the driven wheel 512 is disposed between two bearings, and the outer end of the driven wheel 512 is limited by a fixing nut or a snap ring.

[0106] Motor 52 drives the drive wheel 511 to rotate. To reduce the installation width, motor 52 is located above or below the synchronous belt assembly 51. In this embodiment, the motor is located below the synchronous belt assembly 51 and is fixed to one side of the wheel mounting base 514 by a motor fixing plate 524, forming a stable support structure with the synchronous belt assembly 51. An output wheel 521 is mounted on the main shaft of motor 52, and a synchronously rotating input wheel 522 is provided on one side of the drive wheel 511. The output wheel 521 and the input wheel 522 are connected by an output belt 523, which is preferably a synchronous belt. In this embodiment, a synchronous belt is used for rotation, which has advantages such as low noise, low vibration, and high transmission accuracy, and can improve the movement accuracy and stability of the door device 4 and reduce the noise of the drawer opening and closing device 5.

[0107] A linkage 53 is provided between the synchronous belt assembly 51 and the side connector 43. One end of the linkage 53 is fixed on the synchronous belt 513, and the other end is fixed on the side connector 43. The reciprocating motion of the synchronous belt 513 enables the linear movement of the side connector 43 and the door device 4.

[0108] Specifically, such as Figure 17 , 18 As shown, the linkage component 53 includes a linkage plate 531 and a fixing block 532. The linkage plate 531 is a sheet structure with a first fixing part 5311 connected to the synchronous belt 513 and a second fixing part 5312 connected to the side connecting member 43. The first fixing part 5311 is bent and disposed at the bottom of the second fixing part 5312, and the two are arranged vertically.

[0109] The first fixing part 5311 has a tooth groove 5313 adapted to the tooth surface of the timing belt 513 and at least one first connecting hole 5314 for connecting the fixing block 532. The fixing block 532 is L-shaped and has a second connecting hole 5321 corresponding to the first connecting hole 5314 and a slot 5322 for inserting the first fixing part 5311. A fastener (screw) is provided between the first connecting hole 5314 and the second connecting hole 5321. The first fixing part 5311 is installed on one side of the tooth surface of the timing belt 513, and part of the tooth shape of the tooth surface of the timing belt 513 is embedded in the tooth groove 5313. The fixing block 532 is installed on the non-tooth surface side of the timing belt 513. At the same time, the end of the first fixing part 5311 is inserted into the slot 5322 of the fixing block 532. The inner end of the first fixing part 5311 is fixed to the fixing block 532 by fasteners (screws, etc.), thereby realizing a reliable connection between the linkage 53 and the timing belt 513. In this embodiment, the connection structure between the linkage 53 and the timing belt 513 can prevent slippage, making the transmission more reliable and precise; at the same time, it will not damage the timing belt.

[0110] In addition, the length of the timing belt 513 is matched with the stroke of the door device 4. The mounting point of the first fixing part 5311 on the timing belt 513 is always located between the driving wheel 511 and the driven wheel 512. Therefore, during the movement, it will not interfere with the driving wheel 511 or the driven wheel 512.

[0111] The second fixing part 5312 is provided with a positioning protrusion 5316 and at least one first mounting hole 5315, with the positioning protrusion 5316 preferably arranged vertically. The tail of the side connector 43 is provided with a positioning groove 431 that mates with the positioning protrusion 5316 and a second mounting hole 432 corresponding to the first mounting hole 5315. During installation, the positioning protrusion 5316 is first inserted into the positioning groove 431, and then the first mounting hole 5315 and the second mounting hole 432 are fixedly connected by screws, thereby achieving a reliable connection between the linkage 53 and the side connector 43.

[0112] Preferably, a limiting member 44 is provided at the tail of the side connector 43. The limiting member 44 can be integrally or separately provided on the side connector 43. In order to reduce costs, in this embodiment, the side connector 43, the slide rail fixing beam 124, the front vertical beam 122, and the rear vertical beam 123 are all C-shaped profiles. The limiting member 44 is separately provided on the side connector 43 by screws. A first micro switch 54 is provided at the front end of the housing 1. When the door device 4 reaches the open position, the limiting member 44 triggers the first micro switch 54 and controls the motor 52 to stop. At the same time, the interaction between the first micro switch 54 and the limiting member 44 can also prevent the door device 4 from opening further.

[0113] In addition, at least one pair of door lock assemblies 45 are provided on the door body 42, and corresponding lock holes 121 are provided on the front panel 125 of the housing 1. A second micro switch (not shown in the figure) is provided in one of the lock holes 121. When the door device 4 reaches the closed position, the door lock assembly 45 contacts the second micro switch and controls the motor 52 to stop. In addition, two third micro switches (not shown in the figure) are provided in the other lock hole 121. The door lock assembly 45 can simultaneously trigger the third micro switches and connect the power circuit of the microwave generator 2 and the electric heating device 3 through the main control board.

[0114] In this embodiment, there are two ways to control the door device 4: one is to drive it through the drawer open button and drawer close button on the main operation panel 400; the other is for the user to push and pull it manually. After the system senses the direction of movement of the door device 4, it will start the motor 52 to work and open or close the door device 4 accordingly until the first micro switch 54 or the second micro switch is triggered, at which point the motor 52 will stop working.

[0115] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A drawer-type double-layer combined kitchen appliance, characterized in that, include: Rack (100); The first device (200) is installed above the frame (100); as well as The second device (300) is installed below the frame (100); The second device (300) includes: The chassis (1) has an inner liner (11) and an outer shell (12) disposed on the outer periphery of the inner liner (11); The door assembly (4) includes a drawer storage frame (41) located within the inner liner (11), a door body (42) sealing the inner liner (11), and side connectors (43) respectively installed on the left and right sides of the door body (42), the side connectors (43) being installed within the housing (1) via slide rail assemblies (6); and A drawer opening and closing device (5) is provided on one side of the chassis (1) for driving the door device (4) to open and close; The drawer opening and closing device (5) includes: The timing belt assembly (51) has a driving pulley (511), a driven pulley (512) and a timing belt (513) disposed between the two; Motor (52) for driving the drive wheel (511) to rotate; and The linkage component (53) is fixed at one end to the synchronous belt (513) and at the other end to the side connector (43); The synchronous belt (513) drives the side connector (43) to perform linear reciprocating motion through the linkage (53).

2. The drawer-type double-layer combined kitchen appliance according to claim 1, characterized in that: The linkage component (53) includes a linkage plate (531) and a fixing block (532). The linkage plate (531) has a first fixing part (5311) connected to the synchronous belt (513) and a second fixing part (5312) connected to the side connector (43). The first fixing part (5311) is fixed to the synchronous belt (513) by the fixing block (532).

3. A drawer-type double-layer combined kitchen appliance according to claim 1, characterized in that: The top of the inner liner (11) is provided with an inner liner microwave inlet (111) and a stirring cavity (112) connected to the inner liner microwave inlet (111); The second device (300) further includes a microwave generator (2) mounted on top of the chassis (1), which includes: A microwave generating mechanism (21) is used to generate microwaves; The waveguide box (22) has a waveguide inlet (221) connected to the microwave generating mechanism (21) and a waveguide outlet (222) connected to the inner microwave inlet (111), for introducing the microwaves into the stirring cavity (112); and The wave stirring mechanism (23) is installed on the waveguide box (22) and has a wave stirring motor (231), a wave stirring shaft (232) and a wave stirring plate (233) located in the wave stirring cavity (112). The wave stirring motor (231) drives the wave stirring plate (233) to rotate through the wave stirring shaft (232).

4. A drawer-type double-layer combined kitchen appliance according to claim 3, characterized in that: The waveguide box (22) includes an upper waveguide box body (224) and a lower waveguide box body (225), which are fixed by welding along their edges; a tuning rod (226) is provided on the upper waveguide box body (224).

5. A drawer-type double-layer combined kitchen appliance according to claim 3, characterized in that: The microwave generator (2) further includes a microwave heat dissipation mechanism (24), which has a microwave heat dissipation housing (241) and a microwave heat dissipation fan (242). The microwave heat dissipation housing (241) is provided with a microwave air inlet (243), a microwave heat dissipation channel and a microwave air outlet (244) connected in sequence. The microwave air outlet (244) is connected to the outer shell exhaust hole (127) of the outer shell (12). The microwave heat dissipation fan (242) is located in the microwave heat dissipation channel. The microwave generating mechanism (21) includes a frequency converter (211) and a magnetron (212) disposed in the microwave heat dissipation channel.

6. A drawer-type double-layer combined kitchen appliance according to claim 3, characterized in that: The second device (300) also includes a top heating mechanism (31), which is a top electric heating tube, and a microwave-avoiding part (311) is provided in the middle of the top electric heating tube. The microwave generator (2) and the stirring cavity (112) are both located at the top of the inner liner (11), and the air-proof part (311) is located directly below the stirring cavity (112).

7. A drawer-type double-layer combined kitchen appliance according to any one of claims 1-6, characterized in that: The second device (300) further includes a back heating mechanism (32), which includes a back heating tube (321), a circulating fan (322), and a heating tube baffle (323). A back heating cavity is formed between the heating tube baffle (323) and the back plate of the inner liner (11). The back heating cavity is equipped with the back heating tube (321) and the circulating fan (322). The position of the heating tube baffle (323) corresponding to the circulating fan (322) is provided with a plurality of first vent holes (3231), and the position of the heating tube baffle (323) corresponding to the back heating tube (321) is provided with a plurality of second vent holes (3232).

8. A drawer-type double-layer combined kitchen appliance according to any one of claims 1-6, Its features are: in, The first device (200) includes: The inner casing (1A) has a baking cavity; The outer casing (2A) is disposed on the outer periphery of the inner casing (1A); A door-opening device (3A) is provided on the front side of the outer casing (2A) for sealing the baking cavity; A baking device (4A), disposed on the inner casing (1A), is used to heat food within the baking cavity; and An oven cooling device (5A) includes an oven cooling channel and an oven cooling fan (51A) disposed within the oven cooling channel; The oven heat dissipation channels include an upper heat dissipation channel (52A) located above the inner casing (1A), a rear heat dissipation channel (53A) located on the back of the inner casing (1A), and a lower heat dissipation channel (54A) located below the inner casing (1A). The upper end of the front shell of the outer casing (2A) is provided with at least one air inlet (55A) connected to the upper heat dissipation channel (52A), and the lower end of the front shell of the outer casing (2A) is provided with at least one air outlet (56A) connected to the lower heat dissipation channel (54A).

9. A drawer-type double-layer combined kitchen appliance according to claim 8, characterized in that: The air inlet (55A) includes a first air inlet and a second air inlet that communicate with the outside, with the first air inlet located above the second air inlet. The door-opening device (3A) is provided with a door heat dissipation duct (31A) and a door air intake (32A) and a door air outlet (33A) that connect the door heat dissipation duct (31A). The door air intake (32A) is located at the bottom or left and right sides of the door-opening device (3A), and the door air outlet (33A) is located on the upper inner side of the door-opening device (3A). When the door-opening device (3A) is closed, the door air outlet (33A) faces the second air inlet, so that the door heat dissipation duct (31A) connects to the oven heat dissipation channel.

10. A drawer-type double-layer combined kitchen appliance according to claim 8, characterized in that: A heat dissipation baffle (6A) is provided above the inner casing (1A), and an upper heat dissipation channel (52A) is provided between the heat dissipation baffle (6A) and the top shell plate of the outer casing (2A). The back of the inner casing (1A) is provided with a mounting partition (7A), and the rear heat dissipation channel (53A) is provided between the mounting partition (7A) and the back shell plate of the outer casing (2A). A heat insulation partition (8A) is provided at the lower part of the inner casing (1A), and a lower heat dissipation channel (54A) is provided between the heat insulation partition (8A) and the bottom shell plate of the outer casing (2A).

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