Hot air circulating system for combined heating microwave oven

Abstract

The utility model discloses a hot air circulation system for a combined heating microwave oven, which comprises a fan I, an air duct and an air guide component, the fan I is fixedly connected to a microwave oven liner, an air inlet of the fan I is matched with a ventilation opening of a microwave oven box body, one end of the air duct is communicated with an air outlet of the fan I, and the other end of the air duct is communicated with an air outlet of the fan II; a microwave frequency conversion plate and a magnetron of the microwave oven 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. When the microwave oven works, the microwave frequency conversion plate and the magnetron operate to generate heat, the first fan operates synchronously, external air is sucked into the air duct through the ventilation opening of the microwave oven body, heat dissipation is conducted on the microwave frequency conversion plate and the magnetron, and meanwhile heat is blown into the microwave oven inner container through the air guide assembly. When the temperature in the microwave oven rises, the air duct and the inner container are closed through the air guide assembly, and the first draught fan continuously conducts heat dissipation on the microwave frequency conversion plate and the magnetron.

Description

Technical Field

[0001] This utility model belongs to the technical field of microwave oven equipment, specifically relating to a hot air circulation system for a combined heating microwave oven. 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 invention is to solve the aforementioned technical problems in the prior art and to provide a combined heating microwave oven hot air circulation system. By installing 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, and the fan operates synchronously, drawing outside air into the air duct through the microwave oven's ventilation opening 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, while 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] A combined heating microwave oven hot air circulation system includes a fan, an air duct, and an air guide assembly. The fan is fixedly connected to the microwave oven's inner cavity, and its air inlet matches the microwave oven's ventilation opening. One end of the air duct connects to the fan's air outlet. The microwave oven's inverter board and magnetron are both housed within the air duct, and the air guide assembly is located at the other end of the air duct, connected to the inner cavity. This invention, by placing the fan, air duct, and air guide assembly at the top of the inner cavity, conceals the microwave inverter board and magnetron within the air duct. When the microwave oven operates, the inverter board and magnetron generate heat. The fan operates synchronously, drawing outside air into the air duct through the microwave oven's ventilation opening to dissipate heat from the inverter board and magnetron. Simultaneously, the air guide assembly blows the heat into the inner cavity, providing a preheating effect. Once the temperature inside the microwave oven rises, the air guide assembly closes the air duct and inner cavity, while the fan continues to dissipate heat from the 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 movement of the cover on both sides of its bottom. The cover forming the air duct on the base plate, with the edge serving as a limiting feature for the cover's installation, further enhances the air duct's functionality.

[0008] Furthermore, a slot is provided along the edge, and a corresponding elastic buckle is provided at the bottom of the cover. The elastic buckle is locked in the slot. After the cover is placed on the base plate, the elastic buckle is locked in the slot, thus fixing the base plate and the cover together.

[0009] Furthermore, 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, with one end connected to the air duct. The air guide flap is connected inside the air guide shroud via the driving component. The inner liner has through holes corresponding to the air guide shroud, and the driving component controls the air guide shroud to open and close the through holes. The inner liner has air curtain guide strips located at the through holes. When the microwave oven starts working, the fan pairs heat the microwave inverter board and magnetron, blowing the heat into the air guide shroud. The air guide flap is initially in the open state, and the heat is blown in through the through holes in the inner liner and then evenly into the microwave oven's inner liner after passing through the air curtain guide strips, serving a preheating function. When the temperature inside the microwave oven's inner liner rises, the driving component controls the air guide flap to flip and close the through holes.

[0010] Furthermore, a rotating base is located inside the air guide hood near the microwave oven door. One end of the air guide flap is rotatably connected to the rotating base. A hook one is located inside the air guide hood near the microwave oven door, and a hook two is located at the other end of the air guide flap. A spring connects hook one and hook two, pulling the other end of the air guide flap upwards, thus opening the through hole. The spring is designed to automatically pull the air guide flap upwards, ensuring it is initially in the open state.

[0011] Furthermore, the driving component uses a wax motor; a motor mounting base is provided on the air guide shroud, and the wax motor is fixedly connected to the motor mounting base. The output end of the wax motor passes through the air guide shroud and acts on the air guide flap, controlling the air guide flap to rotate. The wax motor is filled with heat-sensitive wax, which expands when heated, pushing the piston to generate mechanical movement. Initially, the air guide flap is in the open state, and the wax motor does not run. When the microwave oven is running, the fan pairs heat the microwave inverter board and magnetron, and the heat is blown into the inner cavity through the through hole for preheating. When the temperature of the microwave oven inner cavity rises to the set value, the wax expands and pushes the piston, triggering the mechanical action, and the wax motor runs, thereby pushing the air guide flap downward, thus closing the through hole and preventing the high temperature inside the inner cavity from affecting the heat dissipation of the microwave inverter board and magnetron.

[0012] Furthermore, it also includes a light wave tube assembly. A mounting hole is provided at the top of the microwave oven cavity, 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 irradiates the food inside the cavity, compensating for the heat on the top of the food, making the food heated more evenly; it is used for heating in the baking mode of the combination heating microwave oven, and for auxiliary heating in microwave mode.

[0013] Furthermore, the light wave tube assembly includes a fixed bracket, a reflector, a suspension seat, a light wave heating tube, and a bottom cover. The top of the suspension seat is fixedly connected to both ends of the bottom of the fixed bracket, and the bottom of the suspension 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 within 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 reflector is designed to focus the light wave heating tube's beam into the inner cavity.

[0014] Furthermore, it also includes a hot air assembly located on the back of the inner cavity. An air intake is located at the center of the inner wall, and air outlets are distributed at the four corners of the inner wall. In the baking mode of the combined heating microwave oven, the hot air assembly circulates within the inner cavity, improving the evenness of food temperature.

[0015] Furthermore, the hot air assembly includes a fixed cover, an air guide bracket, a fixed support, a second fan, and air guide vanes. The fixed cover, matching the air intake and exhaust ports, is located on the back of the inner liner, forming an assembly cavity between the fixed cover and the inner liner. The inner liner and the assembly cavity are connected. A mounting groove runs 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 air guide bracket is located inside the assembly cavity and fixedly connected to the fixed cover. An air guide vane is located on the side of the air guide bracket closest to the inner liner. A heating tube spacer is also fixedly connected to the side of the air guide bracket closest to the inner liner. A ring-shaped heating tube is fixedly connected to the heating tube spacer and coiled around the outside of the second fan. The air guide vane increases the smoothness of the high-temperature gas flow inside the inner liner, forming a circulating temperature field, resulting in even heating of the food. The ring-shaped heating tube ensures that the air blown out by the second fan is hot air, realizing a baking cooking method in the combined heating microwave oven.

[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] The air guide assembly of this utility model includes an air guide cover, an air guide flap, and a driving component. The air guide cover is fixedly connected to the inner liner, and one end of the air guide cover is connected to the air duct. The air guide flap is connected to the inside of the air guide cover through the driving component. The inner liner has a through hole corresponding to the air guide cover. The driving component controls the air guide cover to open and close the through hole. The inner liner has an air curtain guide bar located at the through hole. When the microwave oven starts working, the fan pairs heat the microwave inverter board and magnetron and blows the heat into the air guide cover. The air guide flap is initially in the open state. The heat is blown in through the through hole of the inner liner and then evenly into the microwave oven inner liner after passing through the air curtain guide bar, which plays a preheating role. When the temperature inside the microwave oven inner liner rises, the driving component controls the air guide flap to flip and close the through hole.

[0019] This invention also includes a light wave tube assembly. A mounting hole is provided at the top of the microwave oven's inner cavity, 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's inner cavity. The light wave tube assembly irradiates the food inside the inner cavity, compensating for the heat on 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, and also for auxiliary heating in microwave mode. 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 structure of the combined heating microwave oven of this utility model;

[0022] Figure 2 for Figure 1 Cross-sectional view of AA in the middle;

[0023] Figure 3 for Figure 1 Cross-sectional view of BB in the middle;

[0024] Figure 4 for Figure 2 Cross-sectional view of CC in China;

[0025] Figure 5 This is a schematic diagram of the hot air assembly in this utility model;

[0026] Figure 6 This is a schematic diagram of the connection between the air duct and the air guide assembly in this utility model;

[0027] Figure 7 This is a schematic diagram of the air guide component in this utility model;

[0028] Figure 8 This is a schematic diagram of the optical wave tube assembly in this utility model.

[0029] In the diagram, 1-Fan 1; 2-Air duct; 3-Air guide assembly; 4-Microwave oven; 5-Inner liner; 6-Microwave inverter board; 7-Magnetron; 8-Cover; 9-Base plate; 10-Edge; 11-Slot; 12-Elastic buckle; 13-Air guide cover; 14-Air guide flap; 15-Motor; 16-Assembly cavity; 17-Air curtain guide bar; 18-Rotating seat; 19-Hook 1; 20-Hook 2; 21-Spring; 22-Motor mount Mounting bracket; 23-Light wave tube assembly; 24-Fixed bracket; 25-Reflector; 26-Suspension seat; 27-Light wave heating tube; 28-Bottom cover; 29-Through hole; 30-Hot air assembly; 31-Air inlet; 32-Air outlet; 33-Fixed cover; 34-Air guide bracket; 35-Fixed support; 36-Fan II; 37-Air guide plate; 38-Mounting cavity; 39-Mounting groove; 41-Heating tube spacer; 42-Annular heating tube. Detailed Implementation

[0030] like Figures 1 to 8As shown, this utility model describes a combined heating microwave oven hot air circulation system, including a fan 1, an air duct 2, and an air guide assembly 3. The fan 1 is fixedly connected to the inner cavity 5 of the microwave oven 4. The air inlet of the fan 1 is matched with the ventilation opening of the microwave oven 4. One end of the air duct 2 is connected to the air outlet of the fan 1. The microwave inverter board 6 and the magnetron 7 of the microwave oven 4 are both located in the air duct 2. The air guide assembly 3 is located at the other end of the air duct 2 and is connected to the inner cavity 5.

[0031] The air duct 2 is formed by the cover 8 covering the base plate 9. The base plate 9 is fixedly connected to the inner liner 5. The top surface of the base plate 9 protrudes upwards corresponding to the cover 8 to form an edge 10, which limits the bottom of the cover 8 on both sides. The cover 8 covering the base plate 9 forms the air duct 2, and the edge 10 provides a limiting function for the installation of the cover 8.

[0032] The edge 10 is provided with a slot 11, and the bottom of the cover 8 is provided with a corresponding elastic buckle 12, which is locked in the slot 11. After the cover 8 is placed on the base plate 9, the elastic buckle 12 is locked in the slot 11, so that the base plate 9 and the cover 8 are fixedly connected.

[0033] The air guide assembly 3 includes an air guide cover 13, an air guide flap 14, and a drive component 15. The air guide cover 13 is fixedly connected to the inner liner 5, and one end of the air guide cover 13 is connected to the air duct 2. The air guide flap 14 is connected to the inside of the air guide cover 13 through the drive component 15. The inner liner 5 has a through hole corresponding to the air guide cover 13. The drive component 15 controls the air guide cover 13 to open and close the through hole. The inner liner 5 has an air curtain guide bar 17 at the through hole. When the microwave oven 4 starts working, the fan 1 dissipates heat from the microwave inverter board 6 and the magnetron 7 and blows the heat into the air guide cover 13. The air guide flap 14 is initially in the open state. The heat is blown in through the through hole of the inner liner 5 and then evenly into the inner liner 5 of the microwave oven 4 after passing through the air curtain guide bar 17, which plays a preheating role. When the temperature inside the inner liner 5 of the microwave oven 4 rises, the drive component 15 controls the air guide flap 14 to flip and close the through hole.

[0034] A rotating base 18 is located inside the air guide cover 13 on the side near the microwave oven door 4. One end of the air guide flap 14 is rotatably connected to the rotating base 18. A hook 19 is located inside the air guide cover 13 on the side near the microwave oven door 4, and a hook 20 is located on the other end of the air guide flap 14. A spring 21 connects the hook 19 and the hook 20. The spring 21 pulls the other end of the air guide flap 14 upward, opening the through hole. The spring 21 is designed to automatically pull the air guide flap 14 upward, so that the air guide flap 14 is in the open state in the initial state.

[0035] The driving component 15 is a wax motor 15; a motor mounting base 22 is provided on the air guide shroud 13, and the wax motor 15 is fixedly connected to the motor mounting base 22. The output end of the wax motor 15 passes through the air guide shroud 13 and acts on the air guide flap 14, controlling the air guide flap 14 to rotate. The wax motor is filled with heat-sensitive wax, which expands when heated, pushing the piston to generate mechanical movement. Initially, the air guide flap 14 is in the open state, and the wax motor 15 does not run. When the microwave oven 4 is running, the fan 1 dissipates heat from the microwave inverter board 6 and the magnetron 7, and the heat is blown into the inner cavity 5 through the through hole for preheating. When the temperature of the inner cavity 5 of the microwave oven 4 rises to the set value, the wax expands and pushes the piston, triggering the mechanical action, and the wax motor 15 runs, thereby pushing the air guide flap 14 downward, thus closing the through hole and preventing the high temperature inside the inner cavity 5 from affecting the heat dissipation of the microwave inverter board 6 and the magnetron 7.

[0036] It also includes a light wave tube assembly 27. A mounting hole is provided on the top of the inner cavity 5 of the microwave oven 4, and the light wave tube assembly 27 is fixed in the mounting hole. The light wave tube assembly 27 is used to heat the food inside the inner cavity 5 of the microwave oven 4. The light wave tube assembly 27 irradiates the food inside the inner cavity 5, providing compensatory heating to the top of the food, making the heating more even; it is used for heating in the baking mode of the combined heating microwave oven, and for auxiliary heating in the microwave mode.

[0037] The light wave tube assembly 27 includes a fixed bracket 24, a reflector 25, a suspension seat 26, a light wave heating tube 27, and a bottom cover 28. The top of the suspension seat 26 is fixedly connected to both ends of the bottom of the fixed bracket 24, and the bottom of the suspension seat 26 is fixedly connected to the top surface of the inner cavity 5. The bottom cover 28 is fixedly connected to the bottom of the reflector 25. The light wave heating tube 27 is fixedly connected within the mounting cavity 38 formed by the reflector 25 and the bottom cover 28. The bottom cover 28 has evenly spaced through holes 29, allowing the mounting cavity 38 to communicate with the inner cavity 5 of the microwave oven 4. The reflector 25 is used to focus the light wave heating tube 27 into the inner cavity.

[0038] It also includes a hot air assembly 30, which is located on the back of the inner liner 5. An air intake 31 is located at the center of the inner wall of the inner liner 5, and air outlets 33 are distributed at the four corners of the inner wall of the inner liner 5. In the baking mode of the combined heating microwave oven, the hot air assembly 30 allows the hot air inside the inner liner 5 to circulate, improving the temperature uniformity of the food.

[0039] The hot air assembly 30 includes a fixed cover 33, an air guide bracket 34, a fixed support 35, a second fan 36, and an air guide plate 37. The fixed cover 33 is matched with the air inlet 31 and the air outlet 33 and is installed on the back of the inner liner 5, so that the fixed cover 33 and the inner liner form an assembly cavity 16. The inner liner 5 is connected to the assembly cavity 16. The back of the fixed cover 33 has a through mounting groove 39. The fixed support 35 is fixedly connected in the mounting groove 39. The second fan 36 is located in the assembly cavity 16 and is fixedly connected to the fixed support 35. The air guide bracket 34 is located in the assembly cavity 16 and is fixedly connected to the fixed cover 33. The air guide bracket 34 is provided with an air guide plate 37 on the side of the air guide bracket 34 near the inner liner 5. A heating tube spacer 41 is also fixedly connected to the side of the air guide bracket 34 near the inner liner 5. An annular heating tube 42 is fixedly connected to the heating tube spacer 41. The annular heating tube 42 is coiled around the outside of the second fan 36. The air guide plate 37 increases the smoothness of the flow of high-temperature gas in the inner liner 5, forming a circulating temperature field, which makes the food heated evenly. The ring heating tube 42 makes the air blown out by the fan 36 hot air, realizing the baking cooking method in the combined heating microwave oven.

[0040] This invention incorporates a fan 1, an air duct 2, and an air guide assembly 3 at the top of the inner liner 5. The microwave inverter board 6 and magnetron 7 are both housed within the air duct 2. When the microwave oven 4 is operating, the microwave inverter board 6 and magnetron 7 generate heat. The fan 1 operates synchronously, drawing outside air into the air duct 2 through the ventilation opening of the microwave oven 4's housing to dissipate heat from the microwave inverter board 6 and magnetron 7. Simultaneously, the air guide assembly 3 blows the heat into the inner liner 5 of the microwave oven 4, providing a preheating effect. Once the temperature inside the microwave oven 4 rises, the air guide assembly 3 closes the air duct 2 and the inner liner 5, while the fan 1 continues to dissipate heat from the microwave inverter board 6 and magnetron 7.

[0041] 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 hot air circulation system for a combined heating microwave oven, characterized in that: The microwave oven includes a fan, an air duct, and an air guide assembly. The fan is fixedly connected to the inner cavity of the microwave oven. The air inlet of the fan matches the ventilation opening of the microwave oven body. One end of the air duct is connected to the air outlet of the fan. The microwave inverter board and magnetron of the microwave oven are both located in the air duct. The air guide assembly is located at the other end of the air duct and is connected to the inner cavity.

2. The hot air circulation system for a combined heating microwave oven according to claim 1, characterized in that: The air duct is formed by the cover being placed on the 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 to form an edge. The edge is limited to both sides of the bottom of the cover.

3. The hot air circulation system for a combined heating microwave oven according to claim 2, characterized in that: The edge is provided with a slot, and the bottom of the cover is provided with a corresponding elastic buckle, which is fastened in the slot.

4. The hot air circulation system for a combined heating microwave oven according to claim 1, characterized in that: The air guiding assembly includes an air guiding hood, an air guiding flap, and a driving component. The air guiding hood is fixedly connected to the inner liner, and one end of the air guiding hood is connected to the air duct. The air guiding flap is connected inside the air guiding hood through the driving component. The inner liner has a through hole corresponding to the air guiding hood. The driving component controls the air guiding hood to open and close the through hole. The inner liner has an air curtain guide bar located at the through hole.

5. The hot air circulation system for a combined heating microwave oven according to claim 4, characterized in that: A rotating seat is provided inside the air guide hood on the side near the microwave oven door. One end of the air guide flap is rotatably connected to the rotating seat. A hook one is provided inside the air guide hood on the side near the microwave oven door. A hook two is provided at the other end of the air guide flap. A spring is connected between the hook one and the hook two. The spring pulls the other end of the air guide flap upward, so that the through hole is opened.

6. The hot air circulation system for a combined heating microwave oven according to claim 4, characterized in that: The driving component is a wax motor; the air guide cover is provided with a motor mounting base, the wax motor is fixedly connected to the motor mounting base, 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.

7. The hot air circulation system for a combined heating microwave oven 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.

8. The hot air circulation system for a combined heating microwave oven according to claim 7, characterized in that: The light wave tube assembly includes a fixed bracket, a reflector, a suspension seat, a light wave heating tube, and a bottom cover. The top of the suspension seat is fixedly connected to both ends of the bottom of the fixed bracket, and the bottom of the suspension 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, so that the mounting cavity is connected to the inner cavity of the microwave oven.

9. The hot air circulation system for a combined heating microwave oven according to claim 1, characterized in that: 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 is provided with an air intake, and the four corners of the inner wall of the inner liner are provided with air outlets.

10. The hot air circulation system for a combined heating microwave oven according to claim 9, characterized in that: The hot air assembly includes a fixed cover, an air guide bracket, a fixed support, a second fan, and air guide vanes. The fixed cover matches the air intake and the air outlet, and is located on the back of the inner liner, forming an assembly cavity between the fixed cover and the inner liner. The inner liner is connected to the assembly cavity. A mounting groove extends through the back of the fixed cover, 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 air guide bracket is located in the assembly cavity and is fixedly connected to the fixed cover. An air guide vane is provided on the side of the air guide bracket near the inner liner. A heating tube spacer is also fixedly connected to the side of the air guide bracket near 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.

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