Combined heating microwave oven structure

Abstract

The utility model discloses a combined heating microwave oven structure, which comprises a box body, a microwave oven body and a microwave oven body, the electric control board is connected to one side of the inner container and used for supplying power; the microwave frequency conversion board is used for adjusting power supply frequency; the magnetron is used for generating microwaves for heating; the door body is connected to the front side of the refrigerator body and controls opening and closing of the inner container; the heat dissipation assembly is arranged between the box body and the inner container and is used for dissipating heat of the microwave frequency conversion plate and the magnetron; the heat dissipation assembly comprises a first fan, an air duct and an air guide assembly, the first fan is fixedly connected to the inner container, an air inlet of the first fan is matched with the ventilation opening of the box body, one end of the air duct is communicated with the first fan, the microwave frequency conversion plate and the magnetron are both arranged in the air duct, and the air guide assembly is arranged at the other end of the air duct and communicated with the inner container. According to the microwave oven, the microwave frequency conversion plate and the magnetron are cooled through the fan I, meanwhile, heat is blown into the inner container of the microwave oven, and a preheating effect is also provided for the microwave oven.

Description

Technical Field

[0001] This utility model belongs to the technical field of microwave oven equipment, specifically relating to a combined heating microwave oven structure. Background Technology

[0002] A microwave oven is a cooking appliance that heats food by allowing it to absorb microwave energy within a microwave field. The microwave generator in a microwave oven creates a microwave electric field within the oven cavity. Certain measures are taken to ensure this microwave electric field is distributed as evenly as possible within the cavity. Food is placed in this microwave electric field, and the cooking time and microwave electric field intensity are controlled by a central control unit to perform various cooking processes.

[0003] In traditional microwave ovens, the microwave inverter board and magnetron operate to heat food. During operation, the temperature of the microwave inverter board and magnetron rises rapidly, causing the temperature above the microwave oven cavity to become too high. With continued use, the high temperature will accelerate the oxidation of the magnetron filament, the demagnetization of the magnet, and the wear and tear of electronic components such as the inverter board capacitors, shortening the overall lifespan. It may also affect nearby high-voltage capacitors or diodes, leading to secondary failures. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art and to provide a combined heating microwave oven structure. By setting a fan, an air duct, and an air guide assembly at the top of the inner cavity, the microwave inverter board and magnetron are both placed in the air duct. When the microwave oven is working, the microwave inverter board and magnetron generate heat. The fan runs synchronously, drawing outside air into the air duct through the ventilation opening of the microwave oven body to dissipate heat from the microwave inverter board and magnetron. At the same time, the air guide assembly blows the heat into the inner cavity of the microwave oven, providing a preheating effect. When the temperature inside the microwave oven rises, the air guide assembly closes the air duct and the inner cavity, and the fan continues to dissipate heat from the microwave inverter board and magnetron.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The combined heating microwave oven structure includes: a cabinet with an inner liner inside; an electrical control board connected to one side of the inner liner for power supply; a microwave frequency converter board for adjusting the power frequency; a magnetron for generating microwaves for heating; and a door connected to the front of the cabinet for controlling the inner liner's opening and closing. It also includes: a heat dissipation assembly located between the cabinet and the inner liner for dissipating heat from the microwave frequency converter board and the magnetron. The heat dissipation assembly includes a fan, an air duct, and a guide assembly. The fan is fixedly connected to the inner liner, and its air inlet matches the ventilation opening of the cabinet. One end of the air duct is connected to the fan, and both the microwave frequency converter board and the magnetron are located within the air duct. The guide assembly is located at the other end of the air duct and is connected to the inner liner. This invention incorporates a fan, an air duct, and a fan guide assembly at the top of the inner cavity, concealing both the microwave inverter board and the magnetron within the air duct. When the microwave oven is operating, the microwave inverter board and magnetron generate heat, and the fan operates synchronously, drawing outside air into the air duct through the microwave oven's ventilation openings to dissipate heat from the microwave inverter board and magnetron. Simultaneously, the fan guide assembly blows the heat into the inner cavity of the microwave oven, providing a preheating effect. Once the temperature inside the microwave oven rises, the fan guide assembly closes the air duct and the inner cavity, while the fan continues to dissipate heat from the microwave inverter board and magnetron.

[0007] Furthermore, the air duct is formed by the cover being placed on the base plate, and the base plate is fixedly connected to the inner liner. The top surface of the base plate protrudes upwards corresponding to the cover, forming an edge that limits the bottom of the cover on both sides. The edge has a slot, and the bottom of the cover has a corresponding elastic buckle that is locked in the slot. The air guide assembly includes an air guide shroud, an air guide flap, and a driving component. The air guide shroud is fixedly connected to the inner liner, and one end of the air guide shroud is connected to the air duct. The air guide flap is connected inside the air guide shroud through the driving component. The inner liner has a through hole corresponding to the air guide shroud, and the driving component controls the air guide shroud to open and close the through hole. The inner liner is located in... A horizontal air curtain guide bar is provided at one of the through holes; a rotating seat is provided on the side of the air guide cover near the microwave oven door, and one end of the air guide flap is rotatably connected to the rotating seat. A hook one is provided on the side of the air guide cover near the door, and a hook two is provided on the other end of the air guide flap. A spring one is connected between hook one and hook two. Spring one pulls the other end of the air guide flap upward, so that the through hole one opens; the driving component is a wax motor; a motor mounting seat is provided on the air guide cover, and the wax motor is fixedly connected to the motor mounting seat. The output end of the wax motor passes through the air guide cover and acts on the air guide flap to control the air guide flap to flip. The edge of the cover acts as a limit, and the elastic buckle secures it to the slot, thus fixing the base plate to the cover. When the microwave oven starts working, the fan pair dissipates heat from the microwave inverter board and magnetron, blowing the heat into the air guide hood. The air guide flap is initially in the open position, and the heat is blown in through the through hole one of the inner cavity and then evenly into the microwave oven's inner cavity after passing through the air curtain guide bar, which serves as a preheating function. When the temperature of the microwave oven's inner cavity rises to the set value, the wax expands and pushes the piston, triggering a mechanical action. The wax motor runs, which pushes the air guide flap downward, thereby closing the through hole one and preventing the high temperature inside the inner cavity from affecting the heat dissipation of the microwave inverter board and magnetron.

[0008] Furthermore, it also includes a light wave tube assembly. The top of the microwave oven's inner cavity has mounting holes, and the light wave tube assembly is fixed in these holes. The light wave tube assembly is used to heat food inside the microwave oven's inner cavity. The light wave tube assembly includes a fixing bracket, a reflector, a hanging seat, a light wave heating tube, and a bottom cover. The top of the hanging seat is fixedly connected to both ends of the bottom of the fixing bracket, and the bottom of the hanging seat is fixedly connected to the top surface of the inner cavity. The bottom cover is fixedly connected to the bottom of the reflector, and the light wave heating tube is fixedly connected to the mounting cavity formed by the reflector and the bottom cover. The bottom cover has evenly spaced through holes, allowing the mounting cavity to communicate with the microwave oven's inner cavity. The light wave tube assembly irradiates the food inside the inner cavity, providing compensatory heating to the top of the food, resulting in more even heating. It is used for heating in the baking mode of a combined heating microwave oven, as well as for auxiliary heating in microwave mode. The reflector is used to focus the light wave heating tube's beam into the inner cavity.

[0009] Furthermore, it also includes a hot air assembly, which is located on the back of the inner liner. The center of the inner wall of the inner liner has an air intake, and the four corners of the inner wall of the inner liner have air outlets. The hot air assembly includes a fixed cover, a guide bracket, a fixed support, a second fan, and a guide vane. The fixed cover, matching the air intake and air outlet, is located on the back of the inner liner, so that the fixed cover and the inner liner form an assembly cavity. The inner liner and the assembly cavity are connected. The back of the fixed cover has a through mounting groove, and the fixed support is fixedly connected in the mounting groove. The second fan is located in the assembly cavity and is fixedly connected to the fixed support. The guide bracket is located in the assembly cavity and is fixedly connected to the fixed cover. The side of the guide bracket near the inner liner has a guide vane. The side of the guide bracket near the inner liner also has a heating tube spacer fixedly connected. The heating tube spacer is fixedly connected to an annular heating tube, which is coiled around the outside of the second fan. In the baking mode of the combined heating microwave oven, the hot air assembly allows the hot air inside the inner cavity to circulate, improving the temperature uniformity of the food. The air guide vanes increase the smoothness of the flow of high-temperature gas inside the inner cavity, forming a circulating temperature field that ensures even heating of the food. The ring-shaped heating tube ensures that the air blown out by the second fan is hot air, realizing the baking cooking method of the combined heating microwave oven.

[0010] Furthermore, it also includes a waveguide box, which is fixedly connected to one side of the inner liner to form a waveguide cavity. A radio frequency (RF) output terminal is located on one side of the magnetron within the waveguide cavity. A waveguide component is located on the inner wall of the waveguide box on the side away from the inner liner. A microwave inlet is provided in the inner liner corresponding to the waveguide component, and a mica sheet is placed in the microwave inlet. The waveguide component is a semi-circular steel ball. A sandwich layer is provided at the bottom of the waveguide box on the side away from the inner liner, and heat dissipation holes are provided on the outer wall of the sandwich layer. By installing the waveguide box on the side of the inner liner opposite to the magnetron's RF output terminal and setting a waveguide component at the corresponding RF output terminal of the waveguide box, a waveguide cavity is formed between the waveguide box and the inner liner. The RF output terminal is located within the waveguide cavity. When the microwave oven is operating, the microwaves generated by the RF output terminal are reflected by the waveguide component and the inner wall of the waveguide box, passing through the mica sheet at the microwave inlet of the inner liner and entering the inner liner to heat the food inside. The waveguide component ensures a wide distribution of microwave energy, reduces energy accumulation at the microwave tip, greatly improves the heating effect of the food, and ensures uniform heating. The curved surface structure of the semi-circular steel sphere allows microwaves generated at the RF output end to be reflected at multiple angles upon impact, overcoming the limitation of a single reflection path in traditional planar waveguide boxes. Through scattering effects, the microwave energy distribution is wider, reducing energy accumulation at the waveguide end, resulting in more uniform food heating and improved heating efficiency. The interlayer design reduces energy escape or ineffective scattering during microwave transmission within the waveguide box, enhancing transmission efficiency from the magnetron to the inner liner. The interlayer also provides shielding, limiting microwave diffusion to non-target areas through multi-level reflections, reducing potential harm from microwave leakage to the human body and environment. Furthermore, the interlayer provides insulation as heat accumulates at the bottom of the waveguide on the side furthest from the inner liner due to the waveguide component's design. Accelerating heat transfer from the interlayer to the outside prevents heat buildup within the interlayer that could lead to component overheating. Simultaneously, it promotes convection between the interlayer and the external environment, improving heat exchange efficiency and reducing the operating temperature of core components such as the magnetron. Furthermore, the heat dissipation holes disrupt the symmetry of the microwave reflection path, reducing the probability of standing wave formation and thus minimizing abnormal microwave energy accumulation in specific areas. A choke plate is installed inside the microwave oven door, which scatters microwaves transmitted to the door back into the inner cavity. It also acts as a microwave screen, limiting microwave diffusion to non-target areas through multi-level reflection, reducing the potential harm of microwave leakage to humans and the environment.

[0011] Furthermore, one side of the electronic control board is fixedly connected to one side of the inner liner via a mounting bracket. The mounting bracket is made of metal, and a choke groove is provided on the side of the mounting bracket closest to the inner liner. A choke groove plate is also provided inside the door. The mounting bracket is used to fix the electronic control board in place. The use of a metal structure ensures the structural strength of the mounting bracket, improves its service life, and enhances its microwave reflection capability, reducing the possibility of microwaves penetrating to the electronic control board area and preventing microwave interference with electronic components or causing safety hazards. The choke design utilizes the principle of microwave reflection to reflect microwave energy from the connection between the control board mounting base and the inner cavity back into the oven cavity. This reduces the risk of microwave leakage from the mounting base gaps to the control area, preventing interference with electronic components or safety hazards. It also improves the absorption and reflection efficiency of high-frequency electromagnetic waves, ensuring a stable operating environment for the control board. Furthermore, by suppressing microwave leakage, the choke reduces energy loss, increases the utilization rate of microwave energy within the inner cavity, and reduces the load pressure on the magnetron. Simultaneously, it avoids the thermal effects of microwaves on the control board components, extending the equipment's lifespan. A choke plate inside the microwave oven door serves two purposes: firstly, it scatters microwaves transmitted to the door back into the inner cavity; secondly, it provides microwave shielding, limiting microwave diffusion to non-target areas through multi-stage reflection, reducing the potential harm of microwave leakage to humans and the environment.

[0012] Furthermore, the cabinet has a door frame corresponding to the door, the door is connected to a lock hook, and a door lock plate is fixedly connected to the door frame. A micro switch is installed on the door lock plate, and the lock hook acts on the micro switch. The micro switch has two switches. A hinge shaft is fixed on the door lock plate, and a connecting rod is connected to the hinge shaft. The connecting rod is matched with the lock hook. The connecting rod includes a bushing, a bent section, and a pushing section. The bent section is located between the bushing and the pushing section. The bushing is sleeved on the outside of the hinge shaft, and the pushing section is matched with the lock hook. The curved section is matched with the second switch; the outer wall of the bushing is provided with an upper limit block and a lower limit block, the lower limit block is located below the upper limit block, and a limiting cavity is formed between the lower limit block and the upper limit block. The door lock plate is provided with a corresponding limiting part, which is limited in the limiting cavity, thereby limiting the bushing on the hinge shaft; the door lock plate is provided with a lock opening corresponding to the lock hook, the lock opening protrudes away from the lock hook to form a limiting protrusion, the limiting protrusion limits the push section, and the side of the lock opening near the lock hook is provided with an inclined part, the inclined part limits the lock The hook guides entry and exit; a pressing plate is formed by a protrusion on the door lock plate, and the pressing plate has a pressing piece, which abuts against the top surface of switch one and switch two and limits them on the door lock plate; a positioning part is formed on the door lock plate corresponding to the pressing plate, and the pressing plate abuts against one side of switch one and one side of switch two, and the positioning part abuts against the other side of switch one and the other side of switch two; both switch one and switch two are provided with through holes two, and the door lock plate is provided with positioning pins, which are inserted into the through holes two; the lock hook includes an installation part and a pressing part, the pressing part is connected to the side of the installation part near the door lock plate, the bottom of the installation part is provided with a connecting hole one, the connecting hole one is used to suspend the connecting spring two, and the top of the installation part is provided with a through hole two for hinged to the door body; when the door body is closed, the pressing part acts on switch one and pushes the pushing section of the connecting rod, the connecting rod rotates around the hinge axis, so that the bending section acts on switch two, the installation part and the pressing part adopt an integral molding structure; the hinge axis is provided with a threaded hole, and a limit screw is connected in the threaded hole. By installing switches one and two on the door lock plate, and rotating a connecting rod on the door lock plate, when the door is closed, the lock hook acts on switch one and simultaneously pushes the connecting rod, causing the connecting rod to act on switch two. The microwave oven can only be started when both switches one and two are fully engaged, effectively preventing the microwave oven from being started with the door open and greatly improving the safety of microwave oven use. The bushing is set on the outside of the hinge shaft, realizing the rotation of the connecting rod. When the microwave oven door is closed, the lock hook is inserted into the door lock plate, so that the end of the lock hook acts on switch one, and at the same time, the lock hook pushes the pushing section, causing the connecting rod to rotate around the hinge shaft, controlling the bending section to act on switch two. The bushing is limited to the outside of the hinge shaft by the limiting part between the upper and lower limiting blocks. The inclined part is designed to facilitate the insertion of the microwave oven's lock hook into the door lock plate, and the inclined part also has a certain guiding function, facilitating the entry and exit of the lock hook from the lock opening. The clamping plate is pressed against one side of switch one and switch two, and the clamping plate limits switch one and switch two to the door lock plate.The positioning post is inserted into the second through hole, providing quick positioning for the installation of switches one and two. The positioning part cooperates with the clamping plate to limit and fix switches one and two on both sides, thus securing them to the door lock plate, eliminating the need for screws. This also makes the installation and removal of switches one and two simple and convenient. The mounting part is used to install the connecting hook. When the door is closed, the pressing part inserts into the lock opening, first acting on switch one, then pushing the connecting rod, causing the connecting rod to act on switch two. This allows the microwave oven to detect that the door is closed and turn on the power for normal operation. The mounting part and pressing part are integrally molded, improving the structural strength of the hook and ensuring the stability of the door lock operation. By screwing in the limiting screw, the bushing is limited to the hinge shaft.

[0013] Furthermore, the hinge shaft has a limiting end at the top, and the outer diameter of the limiting end is larger than the inner diameter of the bushing. After the hinge shaft is injection molded, the bushing is fitted onto the outside of the hinge shaft. Then, by hot pressing the top of the hinge shaft, the top of the hinge shaft is deformed to form the limiting end. The outer diameter of the limiting end is larger than the inner diameter of the bushing, thereby limiting the bushing on the hinge shaft.

[0014] Furthermore, it also includes a lighting assembly, which includes an LED light panel and a mounting bracket. The mounting bracket is fixedly connected to the inner liner, and the LED light panel is fixedly connected to the top of the mounting bracket. A light guide component is provided inside the mounting bracket, and the top of the light guide component is matched with the LED light panel. The top of the inner liner has a through hole three corresponding to the light guide component, and the bottom of the light guide component is located in the through hole three. A light-transmitting cover is provided on the top surface of the inner liner at the through hole three. The mounting bracket adopts a frame structure, and the two sides of the bottom of the mounting bracket extend to form fixing parts, which are fixedly connected to the inner liner. The light-transmitting cover adopts a hemispherical structure. By installing a mounting bracket on the top surface of the inner liner and fixing the LED light panel to the top of the mounting bracket, three through holes are made on the top surface of the inner liner, and a light-transmitting cover is installed at the three through holes. A light guide component is installed between the LED light panel and the light-transmitting cover, so that the light source shines into the inner liner through the light guide component and the light-transmitting cover. This avoids placing the LED light panel inside the inner liner, so that the food can be taken out without being disturbed by the light fixture. Even if the food touches the light-transmitting cover, it will not affect the normal use of the light fixture. The setting of the fixing part increases the contact area between the mounting bracket and the inner liner, thereby improving the stability of the connection between the mounting bracket and the inner liner.

[0015] Furthermore, the light guide assembly includes a glass light guide post and a silicone sleeve for the light guide post. The silicone sleeve wraps around the outside of the glass light guide post, and the bottom of the silicone sleeve is fixedly connected to the mounting bracket, so that the top of the glass light guide post matches the LED light-emitting panel, and the bottom of the glass light guide post is located inside the light-transmitting cover. The bottom of the silicone sleeve has uniformly raised ridges to form limiting rings, and a second groove is formed between two adjacent limiting rings. The top of the mounting bracket has a corresponding second connecting hole, which matches the second groove. The diameter of the limiting ring is larger than the diameter of the second connecting hole. After the silicone sleeve is inserted into the second connecting hole, the limiting ring abuts against the upper and lower sides of the mounting bracket. The silicone sleeve for the light guide post has a hollow structure, and a second mounting cavity is provided in the center of the silicone sleeve. The second mounting cavity matches the glass light guide post. The upper end of the glass light guide column is located inside the second mounting cavity. The length of the silicone sleeve of the light guide column is shorter than the length of the glass light guide column, so that the bottom of the glass light guide column is located inside the mounting frame. The top of the silicone sleeve of the light guide column has a light-transmitting hole, the diameter of which is smaller than the diameter of the second mounting cavity. The top of the mounting frame is connected to a fixing seat, which is fitted onto the outside of the silicone sleeve of the light guide column. The upper and lower ends of the fixing seat are bent to form mounting pieces and fixing pieces. The mounting pieces are located above the fixing pieces, and the fixing pieces are fixedly connected to the mounting frame. The top of the silicone sleeve of the light guide column extends to form a base corresponding to the mounting pieces, and the base rests against the fixing pieces. The two ends of the base are provided with partition columns. The LED light-emitting board is fixed to the mounting pieces through the partition columns, so that a gap is formed between the bottom surface of the LED light-emitting board and the top surface of the silicone sleeve of the light guide column. The silicone sleeve on the light guide post serves to install and secure the glass light guide post, while also providing protection. Because the silicone sleeve encases the glass light guide post, it allows the light from the LED light panel to be conducted into the inner liner, illuminating the interior. Simultaneously, the glass light guide post design allows the LED light panel to be positioned on the outside of the inner liner, preventing collisions with the LED light panel during food handling and thus avoiding malfunction of the light fixture. A second locking groove is formed between two adjacent limiting rings, which aligns with the second connecting hole on the top of the mounting bracket. By inserting the silicone sleeve of the light guide post into the second connecting hole, the second connecting hole and the second locking groove are properly positioned. The matching connection, along with the limiting rings abutting the top and bottom ends of the mounting bracket, secures the light guide column silicone sleeve to the mounting bracket. The second mounting cavity facilitates the installation of the glass light guide column. Furthermore, the length of the light guide column silicone sleeve is shorter than the length of the glass light guide column, ensuring that the bottom of the glass light guide column is not enclosed by the silicone sleeve and rests within the mounting bracket. The mounting bracket employs a frame structure, allowing the light source to converge from the light-transmitting cover. The light source of the LED light panel is transmitted to the glass light guide column through a light-transmitting hole, the diameter of which is smaller than the diameter of the second mounting cavity, thus limiting the installation of the glass light guide column. The fixing plate is used to install the fixing base and to limit the installation of the light guide column silicone sleeve. The partition column creates a gap between the LED light panel and the light guide column silicone sleeve, facilitating the installation of the LED light panel.

[0016] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0017] This invention incorporates a fan, an air duct, and a fan guide assembly at the top of the inner cavity, concealing both the microwave inverter board and the magnetron within the air duct. When the microwave oven is operating, the microwave inverter board and magnetron generate heat, and the fan operates synchronously, drawing outside air into the air duct through the microwave oven's ventilation openings to dissipate heat from the microwave inverter board and magnetron. Simultaneously, the fan guide assembly blows the heat into the inner cavity of the microwave oven, providing a preheating effect. Once the temperature inside the microwave oven rises, the fan guide assembly closes the air duct and the inner cavity, while the fan continues to dissipate heat from the microwave inverter board and magnetron.

[0018] This invention involves installing a waveguide box on one side of the inner liner located at the RF output end of the magnetron, and setting a waveguide component at the corresponding RF output end of the waveguide box. A waveguide cavity is formed between the waveguide box and the inner liner, with the RF output end located inside the waveguide cavity. When the microwave oven is operating, the microwaves generated at the RF output end are reflected by the waveguide component and the inner wall of the waveguide box, passing through the mica sheet at the microwave inlet of the inner liner and entering the inner liner to heat the food inside. The setting of the waveguide component results in a wide distribution range of microwave energy, reduces energy accumulation at the microwave end, greatly improves the heating effect of the food, and ensures uniform heating of the food.

[0019] In this invention, a switch and a switch are installed on the door lock plate, and a connecting rod is rotated on the door lock plate. When the door is closed, the lock hook acts on switch one and pushes the connecting rod at the same time, so that the connecting rod acts on switch two. The microwave oven can only be started when both switches one and two are turned on. This can effectively prevent the microwave oven from being started when the oven door is open, and greatly improve the safety of microwave oven use. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the combined heating microwave oven structure of this utility model;

[0022] Figure 2 for Figure 1 The front view;

[0023] Figure 3 for Figure 2 Cross-sectional view of AA in the middle;

[0024] Figure 4 for Figure 2 Cross-sectional view of BB in the middle;

[0025] Figure 5 for Figure 2 Cross-sectional view of CC in the middle;

[0026] Figure 6 for Figure 2 Cross-sectional view of DD in the middle;

[0027] Figure 7 This is a schematic diagram of the connection between the air duct and the air guide component of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the air guide shroud in this utility model;

[0029] Figure 9 This is a schematic diagram of the internal structure of the inner liner in this utility model;

[0030] Figure 10 This is a schematic diagram of the structure of the electronic control board in this utility model;

[0031] Figure 11 This is a schematic diagram of the optical wave tube assembly in this utility model;

[0032] Figure 12 for Figure 4 Cross-sectional view of the EE;

[0033] Figure 13 This is a schematic diagram of the hot air assembly in this utility model;

[0034] Figure 14 This is a schematic diagram of the structure of the lighting assembly in this utility model;

[0035] Figure 15 for Figure 14 Cross-sectional view of FF in the middle;

[0036] Figure 16 This is a schematic diagram of the connection between the door lock plate and the micro switch in Embodiment 1;

[0037] Figure 17 This is a schematic diagram of the door lock plate in Embodiment 1;

[0038] Figure 18 This is a schematic diagram of the door lock plate in Embodiment 2;

[0039] Figure 19 This is a schematic diagram of the connecting rod in this utility model;

[0040] Figure 20 This is a schematic diagram of the structure of switch two in this utility model;

[0041] Figure 21 This is a schematic diagram of the locking hook structure in this utility model;

[0042] In the diagram, 1-box body; 2-inner liner; 3-electric control board; 4-microwave inverter board; 5-magnetron; 6-door; 7-heat dissipation assembly; 8-fan one; 9-air duct; 10-air guide assembly; 11-cover; 12-bottom plate; 13-edge; 14-slot; 15-elastic buckle; 16-air guide cover; 17-air guide flap; 18-air curtain guide bar; 19-rotating seat; 20-hook one; 21-hook two; 22-spring one; 23-wax motor; 24-light wave tube assembly; 25-fixed bracket; 26-reflector; 27-suspension seat; 2 8-Light wave heating tube; 29-Bottom cover; 30-Mounting cavity one; 31-Through hole one; 32-Hot air assembly; 33-Air intake; 34-Air outlet; 35-Fixed cover; 36-Air guide bracket; 37-Fixed support; 38-Fan two; 39-Air guide plate; 40-Assembly cavity; 41-Mounting groove; 42-Heating tube spacer; 43-Annular heating tube; 44-Waveguide box; 45-Waveguide cavity; 46-RF output terminal; 47-Waveguide component; 48-Microwave inlet; 49-Mica sheet; 50-Semi-circular steel ball; 51-Interlayer; 52-Heat dissipation hole; 53-Choke groove; 54-Choke groove plate; 55-Lock hook; 56-Door lock plate; 57-Switch one; 58-Switch two; 59-Hinge shaft; 60-Connecting rod; 61-Busset; 62-Bending section; 63-Pushing section; 64-Upper limit block; 65-Lower limit block; 66-Limiting cavity; 67-Limiting part; 68-Lock opening; 69-Limiting protrusion; 70-Inclined part; 71-Pressure plate; 72-Pressure piece; 73-Positioning part; 74-Through hole two; 75-Positioning post; 77-Mounting part; 78-Extrusion part; 79-Connecting hole one; 80-Spring II; 81-Through Hole II; 82-Threaded Hole; 83-Limit Screw; 84-Limit End; 85-Lamp Assembly; 86-LED Light Panel; 87-Mounting Bracket; 88-Light Guide Assembly; 89-Light Transmitter Cover; 90-Fixing Part; 91-Glass Light Guide Post; 92-Light Guide Post Silicone Sleeve; 93-Limit Ring; 94-Slot; 95-Connecting Hole II; 96-Mounting Cavity II; 97-Light Transmitter Hole; 98-Fixing Base; 99-Mounting Plate; 100-Fixing Plate; 101-Base; 102-Separating Post; 103-Mounting Base; 104-Door Frame. Detailed Implementation

[0043] like Figures 1 to 21As shown, this utility model's combined heating microwave oven structure includes: a housing 1 with an inner liner 2 inside; an electrical control board 3 connected to one side of the inner liner 2 for power supply; a microwave frequency converter board 4 for adjusting the power frequency; a magnetron 5 for generating microwaves for heating; and a door 6 connected to the front of the housing 1 to control the opening and closing of the inner liner 2. It also includes: a heat dissipation assembly 7 located between the housing 1 and the inner liner 2 for dissipating heat from the microwave frequency converter board 4 and the magnetron 5. The heat dissipation assembly 7 includes a fan 8, an air duct 9, and a guide air assembly 10. The fan 8 is fixedly connected to the inner liner 2, and the air inlet of the fan 8 is matched with the ventilation opening of the housing 1. One end of the air duct 9 is connected to the fan 8. The microwave frequency converter board 4 and the magnetron 5 are both located within the air duct 9, and the guide air assembly 10 is located at the other end of the air duct 9 and is connected to the inner liner 2.

[0044] The air duct 9 is formed by the cover 11 covering the base plate 12. The base plate 12 is fixedly connected to the inner liner 2. The top surface of the base plate 12 protrudes upwards corresponding to the cover 11 to form an edge 13. The edge 13 is limited on both sides of the bottom of the cover 11. The edge 13 is provided with a slot 14. The bottom of the cover 11 is provided with an elastic buckle 15, which is fastened in the slot 14. The air guide assembly 10 includes an air guide cover 16, an air guide flap 17, and a driving component. The air guide cover 16 is fixedly connected to the inner liner 2. One end of the air guide cover 16 is connected to the air duct 9. The air guide flap 17 is connected to the air guide cover 16 through the driving component. The inner liner 2 has a through hole corresponding to the air guide cover 16. The driving component controls the air guide cover 16 to open and close the through hole. An air curtain guide bar 18 is provided at one of the through holes; a rotating seat 19 is provided inside the air guide cover 16 near the microwave oven door 6, and one end of the air guide flap 17 is rotatably connected to the rotating seat 19. A hook 20 is provided inside the air guide cover 16 near the door 6, and a hook 21 is provided at the other end of the air guide flap 17. A spring 22 is connected between the hook 20 and the hook 21. The spring 22 pulls the other end of the air guide flap 17 upward, so that the through hole 1 opens; the driving component is a wax motor 23; a motor mounting seat is provided on the air guide cover 16, and the wax motor 23 is fixedly connected to the motor mounting seat. The output end of the wax motor 23 passes through the air guide cover 16 and acts on the air guide flap 17 to control the air guide flap 17 to flip. The edge 13 limits the cover 11 and is secured to the slot 14 by the elastic buckle 15, thereby fixing the base plate 12 and the cover 11. When the microwave oven starts working, the fan 8 dissipates heat from the microwave inverter board 4 and the magnetron 5 and blows the heat into the air guide shroud 16. The air guide flap 17 is initially in the open state. The heat is blown in through the through hole 1 of the inner cavity 2 and then evenly into the microwave oven inner cavity 2 after passing through the air curtain guide bar 18, which serves as a preheating function. When the temperature of the microwave oven inner cavity 2 rises to the set value, the wax expands and pushes the piston, triggering a mechanical action. The wax motor 23 runs, thereby pushing the air guide flap 17 downward to close the through hole 1, thus preventing the high temperature inside the inner cavity 2 from affecting the heat dissipation of the microwave inverter board 4 and the magnetron 5.

[0045] It also includes a light wave tube assembly 24. The top of the microwave oven inner cavity 2 has a mounting hole, and the light wave tube assembly 24 is fixed in the mounting hole. The light wave tube assembly 24 is used to heat the food inside the microwave oven inner cavity 2. The light wave tube assembly 24 includes a fixing bracket 25, a reflector 26, a hanging seat 27, a light wave heating tube 28, and a bottom cover 29. The top of the hanging seat 27 is fixedly connected to both ends of the bottom of the fixing bracket 25, and the bottom of the hanging seat 27 is fixedly connected to the top surface of the inner cavity 2. The bottom cover 29 is fixedly connected to the bottom of the reflector 26. The light wave heating tube 28 is fixedly connected to the mounting cavity 30 formed by the reflector 26 and the bottom cover 29. The bottom cover 29 has through holes 31 evenly distributed, so that the mounting cavity 30 is connected to the microwave oven inner cavity 2. The light wave tube assembly 24 irradiates the food inside the inner pot 2, compensating for the heat on the top of the food and making the food heat more evenly; it is used for heating in the baking mode of the combined heating microwave oven, as well as for auxiliary heating in the microwave mode. The reflector 26 is set to focus the light wave heating tube 28 into the inner pot.

[0046] It also includes a hot air assembly 32, which is located on the back of the inner liner 2. An air intake 33 is located at the center of the inner wall of the inner liner 2, and air outlets 34 are distributed at the four corners of the inner wall. The hot air assembly 32 includes a fixed cover 35, a guide bracket 36, a fixed support 37, a fan 38, and guide vanes 39. The fixed cover 35, matching the air intake 33 and air outlets 34, is installed on the back of the inner liner 2, forming an assembly cavity 40 between the fixed cover 35 and the inner liner. The inner liner 2 is connected to the assembly cavity 40. The back of the fixed cover 35... A mounting groove 41 runs through the inner cavity 2, and a fixed support 37 is fixedly connected to the mounting groove 41. A second fan 38 is located in the assembly cavity 40 and fixedly connected to the fixed support 37. An air guide bracket 36 is located inside the assembly cavity 40 and fixedly connected to the fixed cover 35. An air guide vane 39 is provided on the side of the air guide bracket 36 closest to the inner cavity 2. A heating tube spacer 42 is also fixedly connected to the side of the air guide bracket 36 closest to the inner cavity 2. An annular heating tube 43 is fixedly connected to the spacer 42 and coiled around the outside of the second fan 38. In the baking mode of the combined heating microwave oven, the hot air assembly 32 circulates the hot air inside the inner cavity 2, improving the uniformity of food temperature. The air guide vane 39 increases the smoothness of the flow of high-temperature gas inside the inner cavity 2, forming a circulating temperature field that ensures even heating of the food. The annular heating tube 43 ensures that the air blown out by the second fan 38 is hot air, thus realizing the baking cooking method in the combined heating microwave oven.

[0047] It also includes a waveguide box 44, which is fixedly connected to one side of the inner liner 2 to form a waveguide cavity 45. A radio frequency output terminal 46 is provided on one side of the magnetron 5. The radio frequency output terminal 46 is located in the waveguide cavity 45. A waveguide component 47 is provided on the inner wall of the waveguide box 44 away from the inner liner 2. A microwave inlet 48 is provided in the inner liner 2 corresponding to the waveguide component 47. A mica sheet 49 is provided in the microwave inlet 48. The waveguide component 47 is a semi-circular steel ball 50. A sandwich layer 51 is provided at the bottom of the waveguide box 44 away from the inner liner 2. A heat dissipation hole 52 is provided on the outer wall of the sandwich layer 51. By installing a waveguide box 44 on one side of the inner cavity 2 located at the RF output terminal 46 of the magnetron 5, and setting a waveguide component 47 on the waveguide box 44 corresponding to the RF output terminal 46, a waveguide cavity 45 is formed between the waveguide box 44 and the inner cavity 2. The RF output terminal 46 is located inside the waveguide cavity 45. When the microwave oven is working, the microwaves generated by the RF output terminal 46 are reflected by the waveguide component 47 and the inner wall of the waveguide box 44, and pass through the mica sheet 49 of the microwave inlet 48 of the inner cavity 2 to enter the inner cavity 2, heating the food inside the inner cavity 2. The setting of the waveguide component 47 makes the microwave energy distribution range wide, reduces the energy accumulation at the microwave end, greatly improves the heating effect of the food, and ensures that the food is heated evenly. The curved surface structure of the semi-circular steel ball allows microwaves generated by the RF output terminal 46 to be reflected at multiple angles after entering the surface of the semi-circular steel ball 50. This breaks through the limitation of the single reflection path of the traditional planar waveguide box 44. Through the scattering effect, the microwave energy distribution range is wider, reducing energy accumulation at the waveguide end, making the food heated evenly and improving the heating efficiency. By setting the interlayer 51, the energy escape or ineffective scattering of microwaves during the transmission process of the waveguide box 44 is reduced, improving the transmission efficiency of microwaves from the magnetron 5 to the inner liner 2. The interlayer 51 also has a shielding function, limiting the diffusion of microwaves to non-target areas through multi-level reflection, reducing the potential harm of microwave leakage to the human body and the environment. At the same time, due to the setting of the waveguide component 47, heat will accumulate at the bottom of the waveguide on the side away from the inner liner 2, and the interlayer 51 also has a heat insulation function. The heat transfer from the interlayer 51 to the outside is accelerated, preventing heat accumulation in the interlayer 51 and causing overheating of components. At the same time, it promotes the formation of convection between the interlayer 51 and the external environment, improves heat exchange efficiency, and reduces the operating temperature of core components such as the magnetron 5. Meanwhile, the heat dissipation holes 52 reduce the probability of standing wave formation by disrupting the symmetry of the microwave reflection path, thereby reducing the abnormal accumulation of microwave energy in specific areas. A choke plate 54 is set in the microwave oven door 6. One function is to scatter the microwaves transmitted to the door 6 back to the inner cavity 2 through the choke plate 54. At the same time, it also has a screen microwave effect, which limits the diffusion of microwaves to non-target areas through multi-level reflection, reducing the potential harm of microwave leakage to the human body and the environment.

[0048] One side of the electronic control board 3 is fixedly connected to one side of the inner liner 2 via a mounting base 103. The mounting base 103 is made of metal, and a choke groove 53 is provided on the side of the mounting base 103 near the inner liner 2. A choke groove plate 54 is provided inside the door body 6. The mounting base 103 is used to fix the electronic control board 3. The use of a metal structure ensures the structural strength of the mounting base 103, improves its service life, and enhances its microwave reflection capability, reducing the possibility of microwaves penetrating to the area of ​​the electronic control board 3, and preventing microwave interference with electronic components or causing safety hazards. The design of the choke groove 53 utilizes the principle of microwave reflection to reflect the microwave energy at the connection between the mounting base 103 of the electronic control board 3 and the inner cavity 2 back into the oven cavity, reducing the risk of microwave leakage from the gaps in the mounting base 103 to the electronic control area, preventing interference with electronic components or causing safety hazards; improving the absorption and reflection efficiency of high-frequency electromagnetic waves, ensuring the stable working environment of the electronic control board 3; and by suppressing microwave leakage, the choke groove 53 reduces energy loss, improves the utilization rate of microwave energy in the inner cavity 2, and reduces the load pressure on the magnetron 5; at the same time, it avoids the thermal effect of microwaves on the components of the electronic control board 3, extending the service life of the equipment; a choke groove plate 54 is set inside the microwave oven door 6, which scatters the microwaves transmitted to the door 6 back into the inner cavity 2 through the choke groove plate 54, and also has a microwave shielding effect, limiting the diffusion of microwaves to non-target areas through multi-level reflection, reducing the potential harm of microwave leakage to the human body and the environment.

[0049] The housing 1 has a door frame 104 corresponding to the door 6. The door 6 is connected to a lock hook 55. A door lock plate 56 is fixedly connected to the door frame 104. A micro switch is installed on the door lock plate 56. The lock hook 55 acts on the micro switch. The micro switch has a first switch 57 and a second switch 58. A hinge shaft 59 is fixed on the door lock plate 56. A connecting rod 60 is connected to the hinge shaft 59. The connecting rod 60 is matched with the lock hook 55. The connecting rod 60 includes a bushing 61, a bent section 62, and a pushing section 63. The bent section 62 is located between the bushing 61 and the pushing section 63. The bushing 61 is sleeved on the outside of the hinge shaft 59. The pushing section 63 is matched with the lock hook 55. The bent section 62 is matched with the second switch 58. An upper limit block 6 is provided on the outer wall of the bushing 61. 4. The lower limit block 65 is located below the upper limit block 64, and a limiting cavity 66 is formed between the lower limit block 65 and the upper limit block 64. The door lock plate 56 is provided with a limiting part 67, which is limited in the limiting cavity 66, thereby limiting the bushing 61 on the hinge shaft 59. The door lock plate 56 is provided with a lock opening 68 corresponding to the lock hook 55. The lock opening 68 protrudes away from the lock hook 55 to form a limiting protrusion 69, which limits the push section 63. The lock opening 68 is provided with an inclined part 70 on the side near the lock hook 55, which guides the entry and retraction of the lock hook 55. A pressing plate 71 is protruded on the door lock plate 56, and a pressing piece 72 is provided on the pressing plate 71. The pressing piece 72 abuts against the switch 57. The top surface of switch 58 is positioned on the door lock plate 56; the door lock plate 56 has a positioning part 73 protruding from the pressing plate 71, the pressing plate 71 abuts against one side of switch 57 and one side of switch 58 respectively, and the positioning part 73 abuts against the other side of switch 57 and switch 58; both switch 57 and switch 58 are provided with through holes 74, and the door lock plate is provided with a positioning post 75, which is inserted into the through hole 74; the lock hook includes a mounting part 77 and a pressing part 78, the pressing part 78 is connected to the side of the mounting part 77 near the door lock plate 56, the bottom of the mounting part 77 is provided with a connecting hole 79, which is used to suspend the connecting spring 80, and the top of the mounting part 77 is provided with a through hole 81, which is used to hinge the lock hook to the door lock plate 56. On the door 6; when the door 6 is closed, the pressing part 78 acts on the first switch 57 and pushes the pushing section 63 of the connecting rod 60. The connecting rod 60 rotates around the hinge axis 59, so that the bending section 62 acts on the second switch 58. The mounting part 77 and the pressing part 78 adopt an integral molding structure. By setting the first switch 57 and the second switch 58 on the door lock plate 56, and rotatably connecting the connecting rod 60 on the door lock plate 56, when the door 6 is closed, the locking hook 55 acts on the first switch 57 and pushes the connecting rod 60 at the same time, so that the connecting rod 60 acts on the second switch 58. The microwave oven can only be started after the first switch 57 and the second switch 58 are fully connected. This can effectively prevent the microwave oven from being started when the oven door is open, and greatly improve the safety of microwave oven use.The bushing 61 is fitted onto the outside of the hinge shaft 59, enabling the rotation of the connecting rod 60. When the microwave oven door is closed, the locking hook 55 inserts into the door lock plate 56, causing the end of the locking hook 55 to act on switch 1 57. Simultaneously, the locking hook 55 pushes against the pushing section 63, causing the connecting rod 60 to rotate around the hinge shaft 59, controlling the bending section 62 to act on switch 2 58. The bushing 61 is limited between the upper limit block 64 and the lower limit block 65 by the limiting part 67, thereby limiting the bushing 61 to the outside of the hinge shaft 59. The inclined part 70 facilitates the insertion of the microwave oven's locking hook 55 into the door lock plate 56, and the inclined part 70 also has a certain guiding function, facilitating the entry and exit of the locking hook 55 from the lock opening 68. The pressing plate 71 abuts against one side of switch 1 57 and switch 2 58, and the pressing piece 72 limits switch 1 57 and switch 2 58 to the door lock plate 56. The positioning post 75 is inserted into the second through hole 74, providing quick positioning for the installation of switches 57 and 58. The positioning part 73 cooperates with the clamping plate 71 to limit and fix the sides of switches 57 and 58, thus securing them to the door lock plate 56, eliminating the need for screws and making installation and removal simple and convenient. The mounting part 77 is used to install the connecting hook 55. When the door 6 is closed, the pressing part 78 inserts into the lock opening 68, first acting on switch 57, then pushing the connecting rod 60, causing the connecting rod 60 to act on switch 58. This allows the microwave oven to detect that the door 6 is closed and turn on the power for normal operation. The mounting part 77 and the pressing part 78 are integrally molded, improving the structural strength of the hook 55 and ensuring the stability of the door lock operation.

[0050] It also includes a lighting assembly 85, which includes an LED light-emitting panel 86 and a mounting bracket 87. The mounting bracket 87 is fixedly connected to the inner liner 2, and the LED light-emitting panel 86 is fixedly connected to the top of the mounting bracket 87. A light guide assembly 88 is provided inside the mounting bracket 87. The top of the light guide assembly 88 is matched with the LED light-emitting panel 86. The top of the inner liner 2 has a through hole three corresponding to the light guide assembly 88. The bottom of the light guide assembly 88 is located in the through hole three. A light-transmitting cover 89 is provided on the top surface of the inner liner 2 at the through hole three. The mounting bracket 87 adopts a frame structure. The two sides of the bottom of the mounting bracket 87 extend to form fixing parts 90, which are fixedly connected to the inner liner 2. The light-transmitting cover 89 adopts a hemispherical structure. By setting the mounting bracket 87 on the top surface of the inner liner 2 and fixing the LED light panel 86 to the top of the mounting bracket 87, a through hole three is opened on the top surface of the inner liner 2, and a light-transmitting cover 89 is installed at the through hole three. A light guide component 88 is set between the LED light panel 86 and the light-transmitting cover 89, so that the light source shines into the inner liner 2 through the light guide component 88 and the light-transmitting cover 89. This avoids placing the LED light panel 86 in the inner liner 2, so that the food can be taken out without being disturbed by the light fixture. Even if the food touches the light-transmitting cover 89, it will not affect the normal use of the light fixture. The setting of the fixing part 90 increases the contact area between the mounting bracket 87 and the inner liner 2, thereby improving the stability of the connection between the mounting bracket 87 and the inner liner 2.

[0051] The light guide assembly 88 includes a glass light guide post 91 and a silicone sleeve 92. The silicone sleeve 92 wraps around the outside of the glass light guide post 91, and the bottom of the silicone sleeve 92 is fixedly connected to the mounting bracket 87, so that the top of the glass light guide post 91 matches the LED light-emitting panel 86, and the bottom of the glass light guide post 91 is located inside the light-transmitting cover 89. The bottom of the silicone sleeve 92 has uniformly raised protrusions to form limiting rings 93, and a slot 94 is formed between two adjacent limiting rings 93. The top of the mounting bracket 87 is provided with a second connection hole 95, which is matched with a second slot 94. The diameter of the limiting ring 93 is larger than the diameter of the second connection hole 95. After the light guide silicone sleeve 92 is inserted into the second connection hole 95, the limiting ring 93 abuts against the upper and lower sides of the mounting bracket 87. The light guide silicone sleeve 92 has a hollow structure, and the center of the light guide silicone sleeve 92 is provided with a second mounting cavity 96, which is matched with the glass light guide 91. The upper end of the glass light guide 91... Located within mounting cavity 2 96, the length of the silicone sleeve 92 of the light guide post is shorter than the length of the glass light guide post 91, so that the bottom of the glass light guide post 91 is located within the mounting bracket 87; the top of the silicone sleeve 92 of the light guide post has a light-transmitting hole 97, the diameter of which is smaller than the diameter of mounting cavity 2 96; a fixing seat 98 is connected to the top of the mounting bracket 87, and the fixing seat 98 is fitted onto the outside of the silicone sleeve 92 of the light guide post; the upper and lower ends of the fixing seat 98 are bent to form mounting pieces 99 and fixing pieces 100. The mounting plate 99 is located above the fixing plate 100, which is fixedly connected to the mounting bracket 87. The top of the light guide silicone sleeve 92 extends from the mounting plate 99 to form a base 101, which rests against the fixing plate 100. The base 101 has a partition column 102 at both ends. The LED light-emitting board 86 is fixed to the mounting plate 99 through the partition column 102, so that a gap is formed between the bottom surface of the LED light-emitting board 86 and the top surface of the light guide silicone sleeve 92.The silicone sleeve 92 of the light guide post serves to install and fix the glass light guide post 91, while also providing protection. Because the silicone sleeve 92 encloses the glass light guide post 91, the glass light guide post 91 transmits the light from the LED light panel 86 to the inner liner 2, illuminating the interior of the inner liner 2. Simultaneously, the glass light guide post allows the LED light panel 86 to be positioned on the outside of the inner liner 2, thus preventing collisions with the LED light panel 86 during food handling, which could render the light fixture unusable. A second groove 94 is formed between two adjacent limiting rings 93, which, in conjunction with the second connecting hole 95 on the top of the mounting bracket 87, allows the silicone sleeve 92 of the light guide post to be inserted into the second connecting hole 95, thus aligning the second connecting hole 95 with the second groove 94. The connection is achieved by limiting the upper and lower ends of the top of the mounting bracket 87 with the limiting ring 93, thereby fixing the light guide silicone sleeve 92 to the mounting bracket 87. The setting of the second mounting cavity 96 facilitates the installation of the glass light guide 91. At the same time, the length of the light guide silicone sleeve 92 is shorter than the length of the glass light guide 91, so that the bottom of the glass light guide 91 is not covered by the light guide silicone sleeve 92 and is located in the mounting bracket 87. The mounting bracket 87 adopts a frame structure, which allows the light source to be focused and emitted from the light-transmitting cover 89. The light source of the LED light-emitting panel 86 is conducted to the glass light guide 91 through the light-transmitting hole 97. At the same time, the diameter of the light-transmitting hole 97 is smaller than the diameter of the second mounting cavity 96, thereby limiting the installation of the glass light guide 91. The fixing plate 100 is used to install the fixing base 98, and the mounting plate 99 is used to limit the installation of the light guide column silicone sleeve 92; the setting of the partition column 102 creates a gap between the LED light-emitting board 86 and the light guide column silicone sleeve 92, which facilitates the installation of the LED light-emitting board 86.

[0052] like Figure 16 and Figure 17 As shown in the first embodiment of this utility model, the hinge shaft 59 is provided with a threaded hole 82, and a limiting screw 83 is connected inside the threaded hole 82. By screwing in the limiting screw 83, the bushing 61 is limited on the hinge shaft 59.

[0053] like Figure 18 As shown in the second embodiment of this utility model, the hinge shaft 59 has a limiting end 84 at its top, and the outer diameter of the limiting end 84 is larger than the inner diameter of the bushing 61. After the hinge shaft 59 is injection molded, the bushing 61 is fitted onto the outside of the hinge shaft 59. By hot pressing the top of the hinge shaft 59, the top of the hinge shaft 59 is deformed to form the limiting end 84. The outer diameter of the limiting end 84 is larger than the inner diameter of the bushing 61, thereby limiting the bushing 61 on the hinge shaft 59.

[0054] This invention incorporates a fan 8, an air duct 9, and an air guide assembly 10 at the top of the inner liner 2. The microwave inverter board 4 and magnetron 5 are both housed within the air duct 9. When the microwave oven is operating, the microwave inverter board 4 and magnetron 5 generate heat. The fan 8 operates synchronously, drawing outside air into the air duct 9 through the ventilation opening of the microwave oven housing 1 to dissipate heat from the microwave inverter board 4 and magnetron 5. Simultaneously, the air guide assembly 10 blows the heat into the inner liner 2 of the microwave oven, providing a preheating effect. Once the temperature inside the microwave oven rises, the air guide assembly 10 closes the air duct 9 and the inner liner 2, while the fan 8 continues to dissipate heat from the microwave inverter board 4 and magnetron 5.

[0055] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A modular heating microwave oven structure, including: The box has an inner liner inside; An electronic control board, connected to one side of the inner liner, is used for power supply; Microwave frequency converter board, used to adjust the power supply frequency; A magnetron generates microwaves for heating; The door is connected to the front side of the box and controls the inner liner switch; Its features also include: A heat dissipation component is disposed between the housing and the inner liner to dissipate heat from the microwave inverter board and the magnetron. The heat dissipation assembly includes a fan, an air duct, and an air guide assembly. The fan is fixedly connected to the inner liner. The air inlet of the fan is matched with the ventilation opening of the housing. One end of the air duct is connected to the fan. The microwave inverter board and the magnetron are both located inside the air duct. The air guide assembly is located at the other end of the air duct and is connected to the inner liner.

2. The combined heating microwave oven structure according to claim 1, characterized in that: The air duct is formed by a cover placed on a base plate. The base plate is fixedly connected to the inner liner. The top surface of the base plate protrudes upwards corresponding to the cover, forming an edge. The edge is limited on both sides of the bottom of the cover and has a groove. The bottom of the cover has a corresponding elastic buckle that engages in the groove. The air guide assembly includes an air guide hood, an air guide flap, and a driving component. The air guide hood is fixedly connected to the inner liner, and one end of the air guide hood is connected to the air duct. The air guide flap is connected inside the air guide hood via the driving component. The inner liner has a through hole corresponding to the air guide hood. The driving component controls the air guide hood to open and close the through hole. An air curtain guide bar is provided at one of the through holes; a rotating seat is provided inside the air guide cover on the side near the microwave oven door, and one end of the air guide flap is rotatably connected to the rotating seat. A hook one is provided inside the air guide cover on the side near the door, and a hook two is provided at the other end of the air guide flap. A spring one is connected between the hook one and the hook two. The spring one pulls the other end of the air guide flap upward, so that the through hole one opens; the driving component is a wax motor; a motor mounting seat is provided on the air guide cover, and the wax motor is fixedly connected to the motor mounting seat. The output end of the wax motor passes through the air guide cover and acts on the air guide flap to control the air guide flap to flip.

3. The combined heating microwave oven structure according to claim 1, characterized in that: It also includes a light wave tube assembly. The top of the microwave oven cavity has a mounting hole, and the light wave tube assembly is fixed in the mounting hole. The light wave tube assembly is used to heat the food inside the microwave oven cavity. The light wave tube assembly includes a fixing bracket, a reflector, a hanging seat, a light wave heating tube, and a bottom cover. The top of the hanging seat is fixedly connected to both ends of the bottom of the fixing bracket, and the bottom of the hanging seat is fixedly connected to the top surface of the cavity. The bottom cover is fixedly connected to the bottom of the reflector. The light wave heating tube is fixedly connected to the mounting cavity formed by the reflector and the bottom cover. The bottom cover has evenly spaced through holes, so that the mounting cavity communicates with the microwave oven cavity.

4. The combined heating microwave oven structure according to claim 1, characterized in that: It also includes a hot air assembly, which is located on the back of the inner liner. An air intake is located at the center of the inner wall of the inner liner, and air outlets are distributed at the four corners of the inner wall. The hot air assembly includes a fixed cover, a guide bracket, a fixed support, a second fan, and guide vanes. The fixed cover matches the air intake, and the air outlets are located on the back of the inner liner, forming an assembly cavity between the fixed cover and the inner liner. The inner liner communicates with the assembly cavity. A mounting groove extends through the back of the fixed cover, and the fixed support is fixedly connected to the mounting groove. The second fan is located in the assembly cavity and fixedly connected to the fixed support. The guide bracket is located within the assembly cavity and fixedly connected to the fixed cover. A guide vane is located on the side of the guide bracket closest to the inner liner. A heating tube spacer is also fixedly connected to the side of the guide bracket closest to the inner liner. An annular heating tube is fixedly connected to the heating tube spacer, and the annular heating tube is coiled around the outside of the second fan.

5. The combined heating microwave oven structure according to claim 1, characterized in that: It also includes a waveguide box, which is fixedly connected to one side of the inner liner to form a waveguide cavity. One side of the magnetron is provided with an RF output terminal, which is located inside the waveguide cavity. A waveguide component is provided on the inner wall of the waveguide box on the side away from the inner liner. The inner liner has a microwave inlet corresponding to the waveguide component. A mica sheet is provided in the microwave inlet. The waveguide component is a semi-circular steel ball. A sandwich layer is provided at the bottom of the waveguide box on the side away from the inner liner. The outer wall of the sandwich layer is provided with heat dissipation holes.

6. The combined heating microwave oven structure according to claim 1, characterized in that: One side of the electronic control board is fixedly connected to one side of the inner liner via a mounting base. The mounting base is made of metal and has a choke groove on the side of the mounting base near the inner liner. A choke groove plate is provided inside the door body.

7. The combined heating microwave oven structure according to claim 1, characterized in that: The housing has a door frame corresponding to the door body. The door body is connected to a lock hook. A door lock plate is fixedly connected to the door frame. A micro switch is installed on the door lock plate. The lock hook acts on the micro switch. The micro switch has a switch one and a switch two. A hinge shaft is fixed on the door lock plate. A connecting rod is connected to the hinge shaft. The connecting rod is matched with the lock hook. The connecting rod includes a bushing, a bending section, and a pushing section. The bending section is located between the bushing and the pushing section. The bushing is sleeved on the outside of the hinge shaft. The pushing section is matched with the lock hook. The curved section is matched with the second switch; the outer wall of the bushing is provided with an upper limit block and a lower limit block, the lower limit block is located below the upper limit block, and a limiting cavity is formed between the lower limit block and the upper limit block. The door lock plate is provided with a corresponding limiting part, which is limited within the limiting cavity, thereby limiting the bushing to the hinge shaft; the door lock plate is provided with a lock opening corresponding to the lock hook, the lock opening protrudes away from the lock hook to form a limiting protrusion, the limiting protrusion limits the push section, and the lock opening is provided with an inclined part on the side near the lock hook, the inclined part... The lock hook is guided to enter and exit; a pressing plate is formed by protrusions on the door lock plate, and the pressing plate is provided with a pressing piece, which abuts against the top surfaces of switch one and switch two and limits their position on the door lock plate; a positioning part is formed on the door lock plate corresponding to the protrusion of the pressing plate, the pressing plate abuts against one side of switch one and one side of switch two respectively, and the positioning part abuts against the other side of switch one and the other side of switch two; both switch one and switch two are provided with through holes two, and the door lock plate is provided with corresponding positioning pins, which are inserted into the through holes two; the lock hook includes an installation... The mounting part and the pressing part are connected to the side of the mounting part near the door lock plate. The bottom of the mounting part is provided with a connecting hole 1 for suspending a connecting spring 2. The top of the mounting part is provided with a through hole 2 for hinged to the door body. When the door body is closed, the pressing part acts on the switch 1 and pushes the pushing section of the connecting rod. The connecting rod rotates around the hinge axis, so that the bending section acts on the switch 2. The mounting part and the pressing part adopt an integral molding structure. The hinge axis is provided with a threaded hole, and a limit screw is connected in the threaded hole.

8. The combined heating microwave oven structure according to claim 7, characterized in that: The hinge shaft has a limiting end at the top, and the outer diameter of the limiting end is larger than the inner diameter of the bushing.

9. The combined heating microwave oven structure according to claim 1, characterized in that: It also includes a lighting assembly, which includes an LED light-emitting panel and a mounting bracket. The mounting bracket is fixedly connected to the inner liner, and the LED light-emitting panel is fixedly connected to the top of the mounting bracket. A light guide component is provided inside the mounting bracket, and the top of the light guide component matches the LED light-emitting panel. The top of the inner liner has a through hole three corresponding to the light guide component, and the bottom of the light guide component is located in the through hole three. A light-transmitting cover is provided on the top surface of the inner liner at the through hole three. The mounting bracket adopts a frame structure, and the two sides of the bottom of the mounting bracket extend to form fixing parts, which are fixedly connected to the inner liner. The light-transmitting cover adopts a hemispherical structure.

10. The combined heating microwave oven structure according to claim 9, characterized in that: The light guide assembly includes a glass light guide post and a silicone sleeve for the light guide post. The silicone sleeve wraps around the outside of the glass light guide post, and the bottom of the silicone sleeve is fixedly connected to the mounting bracket, so that the top of the glass light guide post matches the LED light-emitting panel, and the bottom of the glass light guide post is located inside the light-transmitting cover. The bottom of the silicone sleeve has uniformly raised ridges to form a limiting ring, and a second groove is formed between two adjacent limiting rings. The top of the mounting bracket has a corresponding second connecting hole, which matches the second groove. The diameter of the limiting ring is larger than the diameter of the second connecting hole. After the silicone sleeve is inserted into the second connecting hole, the limiting ring abuts against the upper and lower sides of the mounting bracket. The silicone sleeve has a hollow structure, and a second mounting cavity is provided in the center of the silicone sleeve. The second mounting cavity matches the glass light guide post. The upper end of the column is located inside the second mounting cavity. The length of the silicone sleeve of the light guide column is shorter than the length of the glass light guide column, so that the bottom of the glass light guide column is located inside the mounting frame. The top of the silicone sleeve of the light guide column is provided with a light-transmitting hole, the diameter of which is smaller than the diameter of the second mounting cavity. A fixing seat is connected to the top of the mounting frame, and the fixing seat is sleeved on the outside of the silicone sleeve of the light guide column. The upper and lower ends of the fixing seat are bent to form a mounting piece and a fixing piece. The mounting piece is located above the fixing piece, and the fixing piece is fixedly connected to the mounting frame. The top of the silicone sleeve of the light guide column extends to form a base corresponding to the mounting piece, and the base abuts against the fixing piece. The two ends of the base are provided with partition columns. The LED light-emitting board is fixed to the mounting piece through the partition columns, so that a gap is formed between the bottom surface of the LED light-emitting board and the top surface of the silicone sleeve of the light guide column.

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