Smart cooking machine

Abstract

This utility model discloses an intelligent cooking machine, including multiple microwave generators that radiate microwave energy into the cooking pot, a microwave feed inlet, and a sealing structure for preventing microwave leakage, all installed on the lid of the cooking pot. The sealing structure is a microwave shielding ring installed on the lid to prevent microwave energy fed into the cooking pot from radiating outward through the gap between the lid and the pot opening. The microwave shielding ring is made of a metal material that meets food-grade safety standards, thereby avoiding the harm to the human body caused by microwave leakage and preventing damage to other electronic components on the cooking machine from microwave interference. This microwave shielding ring is not only highly safe, but also has a simple structure and low manufacturing cost. Furthermore, it does not require changes to the existing lid structure, saving the cost of secondary design and manufacturing, and the sealing structure can be easily and conveniently installed on the lid.

Description

Technical Field

[0001] This utility model relates to the field of intelligent cooking machines, and in particular to a sealing structure used in intelligent cooking machines to prevent microwave leakage. Background Technology

[0002] Currently, most cooking machines on the market use electromagnetic or electric heating to cook food. This heating method is limited and inefficient, especially when cooking thicker ingredients. It's easy for the surface to be cooked while the inside remains uncooked. Therefore, to ensure even cooking and avoid the problem of "cooked on the outside, raw on the inside" or "burnt on the outside, cooked on the inside" results in higher-quality dishes, existing technologies have proposed using a microwave generator to feed microwaves into the wok for auxiliary heating. Microwaves have strong penetrating power, significantly shortening heating time, achieving uniform heating, reducing heat loss, and improving heating efficiency. However, due to the introduction of a high-power microwave source (typically several kilowatts), safety is paramount. Microwave leakage must meet national standards (below 5mW / cm²) to prevent harmful radiation exposure and damage to electronic components. Therefore, an effective microwave shielding structure must be installed between the wok and lid to prevent damage from microwave interference.

[0003] In existing technologies, to prevent microwave leakage from the gap between the lid and the rim of the wok, both the wok and the lid are typically made of highly conductive metals such as aluminum. This ensures complete electrical contact when the wok and lid are in close contact, thus achieving microwave shielding. However, this structure has the following drawbacks:

[0004] 1) To achieve perfect electrical contact, the contact surfaces of the lid and the rim of the pot must fit together completely without gaps, which results in high processing costs.

[0005] 2) Due to other technical requirements of intelligent cooking machines (such as sealing to prevent oil fumes from leaking out during cooking, and creating a certain pressure inside the pot during cooking), a silicone sealing ring must be installed on the pot lid, and the gap between the silicone sealing ring and the pot opening is unavoidable.

[0006] 3) Because the inner surface of the wok of a smart cooking machine is generally coated with a layer of non-conductive Teflon coating, after a period of use, a layer of non-conductive oil stains will accumulate on the surface of the wok and lid, causing the electrical contact to fail.

[0007] 4) Intelligent cooking machines use high-power microwaves for microwave-assisted heating (generally several kilowatts or tens of kilowatts). Any unevenness on the contact surface of the lid or wok will create a gap at that location, thus posing a risk of breakdown due to excessively strong local high-frequency field strength. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide an intelligent cooking machine that is simple in structure, low in processing cost, easy to install, safe to use, and can prevent microwave leakage.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A smart cooking machine is provided, comprising multiple microwave generators that radiate microwave energy into the cooking pot, a microwave feed inlet, and a sealing structure for preventing microwave leakage, all mounted on the lid of the cooking pot. The sealing structure is a microwave shielding ring disposed on the lid to prevent microwave energy fed into the cooking pot from radiating outward through the gap between the lid and the opening of the cooking pot. The microwave shielding ring is made of a metal material that meets food-grade safety standards.

[0011] Preferably, the microwave shielding ring is coaxially arranged with the wok and is an annular structure extending from the bottom surface of the lid into the wok. It has at least one concave groove with an opening facing the inner wall of the wok. The radial width between the opening and the corresponding inner wall of the wok is between 3 mm and 10 mm. The frequency of the microwave is 2.45 GHz.

[0012] Preferably, the annular structure includes an annular cylinder and a single-groove choke.

[0013] The vertical cross-section of the annular cylinder is an inverted "L" shape. The horizontal part of the "L" shape is seamlessly fixed to the lid of the pot lid that rotates with the wok. The vertical part of the "L" shape extends downward, leaving a second gap between it and the inner wall of the wok.

[0014] The single-groove choke ring is made of metal and has a horizontally convex vertical cross-section. It consists of an integral upper ring plate, a middle ring plate, and a lower ring plate. The upper and lower ring plates are closed annular plates extending upward and downward along the inner circumferential wall of the wok, respectively. The outer wall of the upper ring plate is seamlessly fixed to the inner wall of the vertical part of the annular cylinder. A first gap is left between the lower ring plate and the inner wall of the wok. The middle ring plate is located between the upper and lower ring plates and is a closed annular plate that protrudes towards the center of the wok and has the concave groove.

[0015] Preferably, the middle ring plate is composed of an integrally formed vertical ring plate, an upper ring plate, and a lower ring plate. The upper ring plate and the lower ring plate are horizontally arranged and closed annular flat plates. The vertical ring plate is a vertically arranged cylindrical structure, with its top and bottom connected to the upper ring plate and the lower ring plate, respectively. The three together form a concave groove with one side opening and a rectangular cross-sectional shape.

[0016] Preferably, the inlet end of the first gap is the short-circuit end of the microwave energy transmission, and the outlet end of the first gap is the open-circuit end of the microwave energy transmission; the inlet end of the second gap is the open-circuit end of the microwave energy transmission, and the outlet end of the second gap is the short-circuit end of the microwave energy transmission.

[0017] Preferably, the depth of the concave groove is between one-fifth and one-quarter of the microwave wavelength; the height of the concave groove is between one-quarter and one-third of the microwave wavelength; and the vertical height of the lower ring plate is not less than 0.08 times the microwave wavelength.

[0018] Preferably, the vertical height of the opening of the concave groove is between 0.15 times and 0.25 times the microwave wavelength.

[0019] Preferably, the annular structure is a double-groove choke ring. The vertical cross-sectional shape of the double-groove choke ring is an "E" shape pointing towards the inner wall of the wok. It consists of an integrally formed circular cylinder and an upper, middle, and lower ring cylinder that surround the outer peripheral wall of the circular cylinder and extend towards the inner wall of the wok. An upper groove and a lower groove are formed between them. The top of the circular cylinder is seamlessly fixed to the lid of the wok lid, which rotates with the wok. The outer peripheral walls of the lower, middle, and upper ring cylinders are respectively provided with a third, a fourth, and a fifth gap from bottom to top between them and the inner wall of the wok.

[0020] Preferably, the inlet end of the third gap is the short-circuit end of the microwave energy transmission, and the outlet end of the third gap is the open-circuit end of the microwave energy transmission; the inlet end and outlet end of the fourth gap are the open-circuit ends of the microwave energy transmission; the inlet end of the fifth gap is the open-circuit end of the microwave energy transmission, and the outlet end of the fifth gap is the short-circuit end of the microwave energy transmission.

[0021] Preferably, the groove depth of the upper and lower grooves is between one-quarter and one-third of the microwave wavelength; the groove height of the upper and lower grooves is between one-tenth and one-quarter of the microwave wavelength; and the vertical height of the lower ring cylinder is not less than 0.08 times the microwave wavelength.

[0022] This invention effectively prevents microwave energy fed into the wok from radiating outwards by setting the sealing structure on the wok lid, thus avoiding the harm to the human body caused by microwave leakage. At the same time, it prevents other electronic components on the wok from being damaged by microwave interference. This sealing structure is not only highly safe, but also simple in structure and low in manufacturing cost. Furthermore, it does not require changes to the existing wok lid structure, saving the cost of secondary design and manufacturing, and the sealing structure can be easily and conveniently installed on the wok lid. Attached Figure Description

[0023] Figure 1 It is a three-dimensional view of the pot lid covering the wok.

[0024] Figure 2 This is a cross-sectional view of the first type of sealing structure installed on the pot lid;

[0025] Figure 3 This is a three-dimensional view of the first sealing structure;

[0026] Figure 4 yes Figure 3 A sectional view;

[0027] Figure 5 This is a partial cross-sectional view of the first sealing structure installed on the pot lid;

[0028] Figure 6 This is a cross-sectional view of the second type of sealing structure installed on the pot lid;

[0029] Figure 7 This is a three-dimensional view of the second type of sealing structure;

[0030] Figure 8 yes Figure 7 A sectional view;

[0031] Figure 9 This is a partial cross-sectional view of the second type of sealing structure installed on the pot lid.

[0032] In the diagram: 1. Wok; 2. Lid; 21. Cover; 22. Mounting base; 23. Microwave feed inlet; 24. Silicone sealing ring; 3. Annular cylinder; 4. Single-groove choke; 41. Upper ring plate; 42. Middle ring plate; 43. Lower ring plate; 44. Upper ring plate; 45. Vertical ring plate; 46. Lower ring plate; 5. Double-groove choke; 51. Circular cylinder; 52. Upper ring cylinder; 53. Middle ring cylinder; 54. Lower ring cylinder; 6. Boss. Detailed Implementation

[0033] like Figures 1 to 9 As shown, the intelligent cooking machine of this utility model has a cooking cavity that can form a sealed space. A wok 1 for cooking ingredients is installed in the cooking cavity. The wok 1 is preferably cylindrical in shape. The outer contour of the upper part of the wok 1 is cylindrical, and the outer contour of the lower part is arc-shaped. A lid 2 is installed on the rear side wall of the cooking cavity. When the wok 1 is cooking ingredients, the lid 2 can be closed on the mouth of the wok 1 to form a sealed space inside the wok 1. When it is necessary to put ingredients into the wok 1 or pour the cooked food out of the wok 1, the lid 2 is moved away from the mouth of the wok.

[0034] At least one microwave generator is installed on the fixing seat 22 of the lid 2 (the fixing seat 22 is fixed to the cooking cavity and does not rotate with the wok 1). Correspondingly, multiple microwave feed inlets 23 connected to the microwave generators are opened on the lid 2. When the lid 2 is closed on the wok, the controller of the cooking machine controls the microwave generator to work as needed and radiates microwave energy into the inner cavity of the wok 1 through the microwave feed inlets 23 to heat the food. This microwave heating method can be used as an auxiliary heating method in combination with the electromagnetic heating or electric heating wire method commonly used in cooking machines. It can effectively improve the heating efficiency and the uniformity of food heating when cooking with the intelligent cooking machine. After the microwave generator stops working, the lid 2 is moved away from the wok.

[0035] The innovation of this utility model lies in:

[0036] A sealing structure is installed on the bottom surface of the lid 21 (the lid 21 is connected to the fixed base 22 via a rotating assembly, and the lid 21 can rotate synchronously with the wok 1 under the drive of the wok 1). During the process of the lid 2 closing on the pot opening (the silicone sealing ring 24 installed on the outer periphery of the lid 21 is tightly attached to or wrapped around the edge of the pot opening), the sealing structure passes through the pot opening and extends into the inner cavity of the wok 1. When the microwave generator feeds microwave energy into the inner cavity of the wok 1, the sealing structure effectively prevents the microwave energy from radiating outward from the gap between the silicone sealing ring 24 and the pot opening, avoiding the harm to the human body caused by microwave leakage, and at the same time preventing other electronic components on the cooking machine from being damaged by microwave interference. This sealing structure is not only highly safe, but also simple in structure and low in manufacturing cost. At the same time, it does not require changing the existing structure of the lid 2 (such as not needing to remove the silicone sealing ring 24 on the lid 2), saving the cost of secondary design and manufacturing, and the sealing structure can be installed on the lid 2 very conveniently and easily.

[0037] The sealing structure is a microwave shielding ring. The microwave shielding ring, the wok 1 and the lid 2 are all coaxially arranged. The microwave shielding ring is an annular structure extending from the bottom surface of the lid 2 into the wok 1, and has at least one concave groove with an opening facing the inner wall of the wok 1.

[0038] The microwave shielding ring preferably has the following two structures:

[0039] 1. First structure

[0040] like Figures 1 to 5 As shown, the microwave shielding ring includes an annular cylinder 3 and a single-slot choke 4. Both the annular cylinder 3 and the single-slot choke 4 are made of a metal that meets food-grade safety standards and has good electrical conductivity, preferably stainless steel.

[0041] 1) Annular cylinder 3

[0042] The annular cylinder 3 is a hollow structure and is coaxially arranged with the pot lid 2. The vertical cross-section of the annular cylinder 3 is an inverted "L" shape. That is, the annular cylinder 3 is composed of an integrally formed annular horizontal plate (i.e., the horizontal part of the inverted "L") and a vertical cylinder (i.e., the vertical part of the inverted "L") that is connected to the outer periphery of the annular horizontal plate and extends downward.

[0043] The annular horizontal plate is used to connect with the cover 21. Specifically, a number of mounting holes are spaced apart along the circumference on it. The top surface of the annular horizontal plate is attached to the top surface of the cover 21 and is seamlessly fixed to the cover 21. The fixing method can be bolt connection or welding, etc. The bottom end face of the vertical cylinder is located below the silicone sealing ring 24.

[0044] A small second gap is left between the outer peripheral wall of the vertical cylinder and the inner wall of the corresponding wok 1 to prevent interference between the vertical cylinder and the wok wall when the lid 2 is closed on the wok opening.

[0045] 2) Single-slot choke coil 4

[0046] The single-slot choke ring 4 is a hollow structure with a vertical cross-section that is a convex shape lying on its side. Specifically, the single-slot choke ring 4 is composed of an upper ring plate 41, a middle ring plate 42 and a lower ring plate 43 connected from top to bottom, or it is an integrally formed structure.

[0047] The upper ring plate 41 and the lower ring plate 43 are annular ring plates with a closed cylindrical structure that extend along the inner circumferential wall of the wok 1.

[0048] The middle ring plate 42 has a concave groove. The middle ring plate 42 is an annular ring plate that protrudes towards the center of the wok 1 and forms a closed shape in the circumferential direction. Specifically, it is composed of an integrally formed cylindrical vertical ring plate 45 and an upper ring plate 44 and a lower ring plate 46 with the same structure and opposite to each other.

[0049] The upper ring plate 44 and the lower ring plate 46 are horizontally arranged and closed annular flat plates. The outer and inner peripheries of the upper ring plate 44 (the direction pointing towards the axis of the pot lid 2 is called the inside, and the direction away from the axis is called the outside, the same below) are respectively connected to the bottom surface of the upper ring plate 41 and the top surface of the middle ring plate 42. The outer and inner peripheries of the lower ring plate 46 are respectively connected to the top surface of the lower ring plate 43 and the bottom surface of the middle ring plate 42. Thus, the upper, middle and lower ring plates are connected into a single-slot choke ring 4, which together form a concave groove with one side opening and a rectangular cross-sectional shape. This side opening is the opening of the concave groove, which faces the inner wall of the wok 1.

[0050] The upper ring plate 41 is used to connect with the annular cylinder 3. Specifically, the outer wall of the upper ring plate 41 is seamlessly fixed to the middle of the inner circumferential wall of the vertical cylinder, and the lower part of the vertical cylinder covers part of the opening of the concave groove. That is, the vertical height between the bottom of the vertical cylinder and the lower ring plate 46 is the vertical height of the opening of the concave groove and the part directly opposite the inner wall of the wok 1. The vertical ring plate 45 is the bottom of the concave groove, the vertical height of the vertical ring plate 45 is the height of the concave groove, and the radial width of the upper ring plate 44 or the lower ring plate 46 is the depth of the concave groove.

[0051] A first gap is left between the outer peripheral wall of the lower ring plate 43 and the inner wall of the wok 1. This first gap is used to prevent interference between the lower ring plate 43 and the wok wall when the lid 2 is closed on the wok opening. The radial width of the first gap and the second gap are preferably in the same range.

[0052] like Figure 5 As shown, this utility model is based on a 68L wok (the maximum allowable volume for stir-frying is 18L) and feeds microwave energy in the 2.45GHz band (center working wavelength is 122.4mm) into the wok. The following dimensional parameters are set:

[0053] G1 3mm~10mm 5 G2 0.15 min <G2<λ / 4 20 L1 L1≥0.08λ 11.2 L2 l / 4 <L2<λ / 3 35.8 L3 l / 5 <L3<λ / 4 30 L4 L4≥0.3λ 41.8

[0054] In the table above, the meanings of each dimension name are as follows:

[0055] G1: Radial width of the first gap and the second gap, which is the radial width between the opening of the concave groove and the inner wall of the corresponding wok 1; G2: Vertical height of the part of the opening that is directly opposite the inner wall of the wok 1; L1: Vertical height of the lower ring plate 43; L2: Groove height; L3: Groove depth; L4: Vertical height of the vertical cylinder.

[0056] This invention utilizes the principle of short-circuit impedance transformation at the end of a microwave transmission line to design the aforementioned sealing structure. This achieves a short-circuit end for microwave energy transmission at the entrance end of the first gap and the exit end of the second gap, while an open-circuit end (high impedance for microwave transmission) is formed at the exit end of the first gap (located beside the opening) and the entrance end of the second gap (located beside the opening). This effectively suppresses microwave leakage to the outside of the pot. A very small portion of the microwaves transmitted from the first gap into the concave groove are reflected and phase-canceled with the incident wave, thus suppressing microwave leakage. The second gap further prevents microwave leakage to the outside of the pot.

[0057] The microwave shielding ring with the above structure is theoretically calculated to have a microwave attenuation of approximately 50 dB in the 2.45 GHz band. A pot lid 2 with this type of microwave shielding ring was tested on a 68L smart cooking machine (maximum allowable volume for stir-frying is 18L). When the microwave feed power reached 8kW and the microwave frequency was 2440MHz-2465MHz, with a standard amount of food in the pot, the lid 2 was placed over the pot opening. At this time, the silicone sealing ring 24 was compressed to within 2mm. The test showed that the microwave leakage value within the circumference of the lid 2 was 1.6mW / cm². 2 The microwave leakage value meets the national standard (below 5mW / cm). 2 ).

[0058] 2. Second structure

[0059] like Figures 6 to 9 As shown, the microwave shielding ring is a double-slot choke ring 5.

[0060] In this structure, the double-groove choke ring 5 is coaxially arranged with the pot lid 2, and its vertical cross-section is "E" shaped. Specifically, it consists of an integrally formed circular ring cylinder 51 and an upper ring cylinder 52, a middle ring cylinder 53 and a lower ring cylinder 54 arranged on the outer peripheral wall of the circular ring cylinder 51 and spaced apart from top to bottom.

[0061] The annular cylinder 51 is vertically arranged, and it is a cylindrical shape that runs through the top and bottom, and its projection on the horizontal plane is an annular shape.

[0062] The upper ring cylinder 52, the middle ring cylinder 53, and the lower ring cylinder 54 have the same shape as the circular ring cylinder 51. They are also hollow cylindrical, and the vertical height of all three is less than that of the circular ring cylinder 51. The radial width (i.e., the ring width) of the upper ring cylinder 52, the middle ring cylinder 53, and the lower ring cylinder 54 is the same.

[0063] The top surface of the upper ring cylinder 52 is on the same horizontal plane as the top surface of the circular ring cylinder 51, and the bottom surface of the lower ring cylinder 54 is on the same horizontal plane as the bottom surface of the circular ring cylinder 51. The upper ring cylinder 52, the upper part of the circular ring cylinder 51 and the middle ring cylinder 53 form an upper groove (i.e., the concave groove), and the middle ring cylinder 53, the lower part of the circular ring cylinder 51 and the lower ring cylinder 54 form a lower groove (i.e., the concave groove). The openings of the upper groove and the lower groove face the inner wall of the wok 1. The groove depth and groove height of the upper groove and the lower groove are preferably the same. The radial width of the upper ring cylinder 52, the middle ring cylinder 53 or the lower ring cylinder 54 is the groove depth of the upper groove or the lower groove.

[0064] Preferably, to facilitate the connection between the double-groove choke ring 5 and the pot lid 2, a boss 6 is provided on the top of the upper ring cylinder 52. The boss 6 is coaxial with the double-groove choke ring 5, protrudes upward, and has a closed structure in the circumferential direction of the double-groove choke ring 5. The top surface of the boss 6 is seamlessly fixed to the lid body 21, and the bottom surface of the upper ring cylinder 52 is located below the silicone sealing ring 24. The boss 6 and the double-groove choke ring 5 can be integrally formed.

[0065] When the lid 2 is closed on the pot opening, the upper, middle and lower annular cylinders 54 and the inner wall of the wok 1 are respectively left with a third gap, a fourth gap and a fifth gap.

[0066] The third, fourth, and fifth gaps are used to prevent interference between the upper, middle, and lower annular cylinders 54 and the pot opening when the lid 2 is closed on the pot opening.

[0067] like Figure 9 As shown, this utility model is based on a 68L wok (the maximum allowable volume for stir-frying is 18L) and feeds microwave energy in the 2.45GHz band (center working wavelength is 122.4mm) into the wok. The following dimensional parameters are set:

[0068] M1 M1≥0.08λ 10 M2 0.1min <M2<0.25λ 19.3 M3 —— 5.6 M4 M4≥0.1λ 15.8 M5 M5≥0.15λ 25.5 K1 3mm~10mm 5 K2 l / 4 <M2<λ / 3 36.1

[0069] In the table above, the meanings of each dimension name are as follows:

[0070] M1: Represents the vertical height of the lower ring cylinder 54; M2: Represents the groove height of the upper or lower groove; M3: Represents the vertical height of the middle ring cylinder 53; M4: Represents the vertical height of the upper ring cylinder 52; M5: Represents the sum of the vertical heights of the upper ring cylinder 52 and the boss 6; K1: The radial width between the third, fourth, and fifth gaps and the inner wall of the wok 1; K2: Represents the radial width of the upper ring cylinder 52, the middle ring cylinder 53, or the lower ring cylinder 54, which is also the groove depth of the upper or lower groove.

[0071] Through the above-described structural and dimensional design, this utility model achieves the following: the inlet end of the third gap (referring to the space formed between the lower end of the lower ring cylinder 54 and the inner wall of the wok 1) forms the short-circuit end for microwave energy transmission, and the outlet end of the third gap (referring to the space formed between the top end of the lower ring cylinder 54 and the inner wall of the wok 1) is the open-circuit end for microwave energy transmission; the inlet end and outlet end of the fourth gap are the open-circuit ends for microwave energy transmission; the inlet end of the fifth gap is the open-circuit end for microwave energy transmission, and the outlet end of the fifth gap is the short-circuit end for microwave energy transmission.

[0072] This sealing structure effectively prevents microwaves from leaking out of the pot. The very small amount of microwaves that leak from the third gap between the lower ring cylinder 54 and the inner wall of the wok 1 into the lower groove are reflected and their phases cancel each other out with the incident wave, thereby suppressing microwave leakage. Similarly, the upper groove further suppresses microwave leakage.

Claims

1. A smart cooking machine, characterized in that, The device includes multiple microwave generators that radiate microwave energy into the wok, installed on the lid of the wok of the cooking machine; a microwave feed inlet; and a sealing structure to prevent microwave leakage. The sealing structure is a microwave shielding ring installed on the lid to prevent microwave energy fed into the wok from radiating outward through the gap between the lid and the wok opening. The microwave shielding ring is made of a metal material that meets food-grade safety standards. The microwave shielding ring is coaxially arranged with the wok and is an annular structure extending from the bottom surface of the lid into the wok, and has at least one concave groove with an opening facing the inner wall of the wok.

2. The intelligent cooking machine according to claim 1, characterized in that, The radial width between the opening of the concave groove and the corresponding inner wall of the wok ranges from 3 mm to 10 mm, and the frequency of the microwave is 2.45 GHz.

3. The intelligent cooking machine according to claim 2, characterized in that, The annular structure includes an annular cylinder and a single-groove choke. The vertical cross-section of the annular cylinder is an inverted "L" shape. The horizontal part of the "L" shape is seamlessly fixed to the lid of the pot lid that rotates with the wok. The vertical part of the "L" shape extends downward, leaving a second gap between it and the inner wall of the wok. The single-groove choke ring is made of metal and has a horizontally convex vertical cross-section. It consists of an integral upper ring plate, a middle ring plate, and a lower ring plate. The upper and lower ring plates are closed annular plates extending upward and downward along the inner circumferential wall of the wok, respectively. The outer wall of the upper ring plate is seamlessly fixed to the inner wall of the vertical part of the annular cylinder. A first gap is left between the lower ring plate and the inner wall of the wok. The middle ring plate is located between the upper and lower ring plates and is a closed annular plate that protrudes towards the center of the wok and has the concave groove.

4. The intelligent cooking machine according to claim 3, characterized in that, The middle ring plate is composed of an integrally formed vertical ring plate, an upper ring plate, and a lower ring plate. The upper ring plate and the lower ring plate are horizontally arranged and closed annular flat plates. The vertical ring plate is a vertically arranged cylindrical structure, with its top and bottom connected to the upper ring plate and the lower ring plate, respectively. The three together form a concave groove with one side opening and a rectangular cross-section.

5. The intelligent cooking machine according to claim 4, characterized in that, The inlet end of the first gap is the short-circuit end of the microwave energy transmission, and the outlet end of the first gap is the open-circuit end of the microwave energy transmission; the inlet end of the second gap is the open-circuit end of the microwave energy transmission, and the outlet end of the second gap is the short-circuit end of the microwave energy transmission.

6. The intelligent cooking machine according to claim 5, characterized in that, The depth of the concave groove is between one-fifth and one-quarter of the microwave wavelength; the height of the concave groove is between one-quarter and one-third of the microwave wavelength; and the vertical height of the lower ring plate is not less than 0.08 times the microwave wavelength.

7. The intelligent cooking machine according to claim 6, characterized in that, The vertical height of the opening of the concave groove is between 0.15 times and 0.25 times the microwave wavelength.

8. The intelligent cooking machine according to claim 2, characterized in that, The annular structure is a double-groove choke ring. The vertical cross-sectional shape of the double-groove choke ring is an "E" shape pointing towards the inner wall of the wok. It consists of an integrally formed circular cylinder and an upper, middle, and lower ring cylinder that surround the outer peripheral wall of the circular cylinder and extend towards the inner wall of the wok. An upper groove and a lower groove are formed between them. The top of the circular cylinder is seamlessly fixed to the lid of the wok lid, which rotates with the wok. The outer peripheral walls of the lower, middle, and upper ring cylinders are respectively provided with a third, a fourth, and a fifth gap from bottom to top between them and the inner wall of the wok.

9. The intelligent cooking machine according to claim 8, characterized in that, The inlet end of the third gap is the short-circuit end for microwave energy transmission, and the outlet end of the third gap is the open-circuit end for microwave energy transmission; the inlet end and outlet end of the fourth gap are both open-circuit ends for microwave energy transmission; the inlet end of the fifth gap is the open-circuit end for microwave energy transmission, and the outlet end of the fifth gap is the short-circuit end for microwave energy transmission.

10. The intelligent cooking machine according to claim 9, characterized in that, The groove depth of the upper and lower grooves is between one-quarter and one-third of the microwave wavelength; the groove height of the upper and lower grooves is between one-tenth and one-quarter of the microwave wavelength; and the vertical height of the lower ring cylinder is not less than 0.08 times the microwave wavelength.

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