Waveguide device, cavity and microwave cooking utensil

Abstract

The utility model discloses a waveguide device, a cavity and a microwave cooking utensil, and relates to the technical field of microwave cooking, the waveguide device forms a wave guide channel and is provided with a microwave inlet and at least two microwave outlets which are communicated with the wave guide channel, and the at least two microwave outlets are arranged on the same surface; the distance between any two points on the edges of the two adjacent microwave outlets is L, the waveguide wavelength of the waveguide device for transmitting microwaves is lambda, and L is larger than or equal to 0.1 lambda. According to the technical scheme, the use safety of the microwave cooking utensil can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave cooking, in particular to a waveguide device, a cavity and a microwave cooking utensil. Background Art

[0002] Microwave cooking appliances such as microwave rice cookers heat food by introducing microwaves into a heating cavity to interact with water molecules in the food to generate frictional heat. In the related art, in order to evenly feed microwaves into the microwave heating cavity, a stirrer is provided or multiple feed ports are opened to evenly disperse the microwaves to various parts of the microwave heating cavity. However, by providing a stirrer, if the stirrer does not rotate or the stirrer blade is deformed, a large number of standing waves may be formed at a certain point in the microwave heating cavity when the user is not cooking, resulting in excessive local electric field strength, causing safety problems such as breakdown voltage arc and sparks. The method of opening multiple feed ports is prone to the formation of standing waves during non-cooking, which may cause sparks. Utility Model Content

[0003] The main purpose of the utility model is to provide a waveguide device, a cavity and a microwave cooking appliance, aiming to improve the safety of the microwave cooking appliance.

[0004] To achieve the above-mentioned purpose, the utility model provides a waveguide device, wherein the waveguide device forms a waveguide channel, and is provided with a microwave inlet and at least two microwave outlets connected to the waveguide channel, and at least two of the microwave outlets are provided on the same surface;

[0005] The distance between any two points on the edges of two adjacent microwave outlets is L, and the waveguide wavelength of the microwave transmitted by the waveguide device is λ, satisfying L≥0.1λ.

[0006] In one embodiment, the shape of the microwave outlet is a polygon, and the number of sides of the microwave outlet is not less than four.

[0007] In one embodiment, the distance d between any two points on two non-adjacent sides of the microwave outlet is ≥ 0.1λ;

[0008] and / or, the number of sides of the microwave outlet does not exceed 16;

[0009] And / or, a rounded corner is provided between two adjacent straight sides of the microwave outlet.

[0010] In one embodiment, the extension direction of at least one of the microwave outlets is arranged at an angle to the extension direction of the waveguide channel;

[0011] And / or, at least two of the microwave outlets are arranged along the width direction of the waveguide channel and are axially symmetrically distributed, and the symmetry axis extends along the extension direction of the waveguide channel.

[0012] In one embodiment, taking the extending direction of the waveguide channel as the first direction and the width direction of the waveguide channel as the second direction, the waveguide device is provided with four microwave output ports;

[0013] The four microwave output ports include two first output ports arranged side by side along the second direction and axially symmetrically distributed, and two second output ports arranged side by side along the second direction and axially symmetrically distributed. The first output port and the second output port are arranged side by side along the first direction.

[0014] In one embodiment, along the direction close to the second output port, the first output port extends obliquely away from the other first output port, and the first output port is arranged as a rectangular structure or an approximately rectangular structure;

[0015] And / or, the second output port extends along the second direction, and a chamfered edge is provided at the corner of the second output port away from the first output port and the other second output port.

[0016] The present application also provides a cavity of a microwave cooking appliance. The cavity forms a microwave heating cavity, and the cavity is provided with at least two microwave feed-in ports communicating with the microwave heating cavity. The at least two microwave feed-in ports are opened on the same surface;

[0017] The edge distance between two adjacent microwave feed-in ports is L1, and the waveguide wavelength of the microwave fed into the cavity is λ, satisfying L1≥0.1λ.

[0018] In one embodiment, the shape of the microwave feed-in port is a polygon, and the number of sides of the microwave feed-in port is not less than four.

[0019] In one embodiment, the distance d1 between any two points on two non-adjacent sides of the microwave feed-in port is d1≥0.1λ;

[0020] And / or, the number of sides of the microwave feed-in port does not exceed 16;

[0021] And / or, a fillet is provided between two adjacent straight sides of the microwave feed-in port.

[0022] In one embodiment, at least two microwave feed-in ports are axially symmetrically distributed;

[0023] And / or, the microwave feed-in port is opened on the bottom surface of the cavity.

[0024] The present application also provides a microwave cooking appliance, which includes a microwave generating device, a waveguide device, and a cavity. The microwave generating device is connected to the microwave input port of the waveguide device, and the microwave output port of the waveguide device is communicated with the microwave feed-in port of the cavity;

[0025] Wherein, the waveguide device is a waveguide device as described in any of the above embodiments;

[0026] And / or, the cavity is the cavity described in any of the preceding embodiments.

[0027] In one embodiment, the microwave cooking appliance is a microwave rice cooker, the microwave heating cavity of the cavity has an opening, and the microwave rice cooker also includes a cover body, which is openably arranged at the opening of the microwave heating cavity, and a steam valve is provided on the cover body, and the steam valve can connect the space inside and outside the microwave heating cavity when exhausting.

[0028] The technical solution of the utility model can be provided with at least two microwave outlets on the waveguide device so that microwaves can be uniformly output to all parts of the cavity of the microwave cooking device, or at least two microwave feed inlets can be provided in the cavity of the microwave cooking device so that microwaves can be uniformly entered and dispersed into the microwave heating cavity, so that there is no need to set up a stirrer to disrupt and disperse the microwaves, thereby avoiding the potential safety hazards caused by stirrer failure. At the same time, when the waveguide device is provided with at least two microwave outlets, the distance between two adjacent microwave outlets is limited to be no less than 1 / 10 of the microwave waveguide wavelength, and when the cavity is provided with at least two microwave feed inlets, the distance between two adjacent microwave feed inlets is limited to be no less than 1 / 10 of the microwave waveguide wavelength, thereby avoiding two adjacent microwave outlets or two adjacent microwave feed inlets from being too close, thereby reducing the risk of ignition problems caused by the breakdown voltage generating arcs when the microwave cooking device is unloaded, and improving the safety of the microwave cooking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A schematic structural diagram of an embodiment of a microwave cooking device provided by the utility model;

[0031] Figure 2 for Figure 1 A top view of the microwave cooking device with the cover removed;

[0032] Figure 3 This is a schematic structural diagram of an embodiment of a waveguide device provided by the utility model.

[0033] Description of Figure Numbers:

[0034] 100. Microwave cooking appliance; 1. Waveguide device; 11. Microwave inlet; 12. Microwave outlet; 121. First outlet; 122. Second outlet; 2. Cavity; 21. Microwave heating cavity; 22. Microwave feeding inlet; 3. Microwave generating device; 4. Cover body.

[0035] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0039] Microwave cooking appliances such as microwave rice cookers heat food by introducing microwaves into a heating cavity where they interact with water molecules in the food to generate frictional heat. In the related art, in order to evenly feed microwaves into the microwave heating cavity, a stirrer is provided or multiple feed ports are opened to evenly disperse the microwaves throughout the microwave heating cavity. However, by providing a stirrer, if the stirrer does not rotate or the stirrer blades are deformed, a large number of standing waves may be easily formed at a certain point in the microwave heating cavity during dry cooking, resulting in excessive local electric field strength, causing safety problems such as breakdown voltage arcs and sparks. By opening multiple feed ports, if the distance between the feed ports is too small, standing waves may be easily formed during dry cooking, causing sparks.

[0040] In order to solve the above problems, the present application proposes a waveguide device 1, which can evenly distribute microwaves to the microwave cooking cavity while reducing the risk of standing waves and ignition in the microwave cooking device 100, thereby improving the safety of use.

[0041] See also Figure 1 and Figure 3 In one embodiment of the utility model, the waveguide device 1 forms a waveguide channel, and is provided with a microwave inlet 11 and at least two microwave outlets 12 connected to the waveguide channel, and at least two microwave outlets 12 are provided on the same surface;

[0042] The distance between any two points on the edges of two adjacent microwave outlets 12 is L, and the waveguide wavelength of the microwave transmitted by the waveguide device 1 is λ, satisfying L≥0.1λ.

[0043] Specifically, the waveguide device 1 is applied to a microwave cooking device 100, which may be a microwave oven and a microwave rice cooker, etc. The microwave cooking device 100 further includes a microwave generator for generating microwaves and a cavity 2 forming a microwave heating cavity 21, the microwave generator may be a magnetron, the cavity 2 may be a structure forming a microwave heating cavity 21 with a top opening, and a cover 4 is correspondingly provided for closing the microwave heating cavity 21; the cavity 2 may also be a structure forming a microwave heating cavity 21 with a side opening, and a door body that can be opened and closed is correspondingly provided to cooperate with the cavity 2; the cavity 2 is provided with a microwave feed port 22 connected to the microwave heating cavity 21. The cavity 2 is generally made of metal, metal-based composite material or other materials with microwave shielding function, so as to prevent microwaves from leaking outward during the process of closing the microwave heating cavity 21 for microwave cooking. In some embodiments, the microwave cooking device 100 further includes an inner pot arranged in the microwave heating cavity 21, the inner pot is used to hold food, and microwaves can penetrate the inner pot to react with the food to heat the food.

[0044] A waveguide channel for guiding microwave traveling waves is formed in the waveguide device 1, and a microwave inlet 11 and a microwave outlet 12 connected to the waveguide channel are provided. The microwave inlet 11 is used to connect with a microwave generating device so that the microwave generating device can feed microwaves into the waveguide channel. The microwaves are transmitted through reflection and refraction in the inner wall of the waveguide channel, and finally the microwaves are coupled into the microwave heating cavity 21 through the microwave outlet 12 and the microwave feeding port 22; the waveguide device 1 is provided with a contact surface for being arranged opposite to the cavity 2, and at least two microwave outlets 12 are provided on the contact surface, wherein a larger microwave feeding port 22 can be provided in the cavity 2 to cover each microwave outlet 12 of the waveguide device 1, or at least two microwave feeding ports 22 can be provided in the cavity 2 to be connected to each microwave outlet 12 respectively, which is not limited here. The number and arrangement of the microwave outlets 12 can be set according to the shape of the cavity 2, so that the at least two microwave outlets 12 opened on the contact surface can roughly fit the contour of the cavity 2, so that the microwaves are evenly fed from each microwave outlet 12 into the microwave heating cavity 21 to heat the food and ensure the cooking effect.

[0045] In the embodiment of the present application, the distance between two adjacent microwave outlets 12 of the waveguide device 1 is limited, and the distance between any two points on the edge of the two adjacent microwave outlets 12 is defined as L. The waveguide wavelength of the microwave transmitted through the waveguide device 1 is λ, and it is necessary to make L≥0.1λ. Such a setting can avoid the two adjacent microwave outlets 12 being too close, and can prevent microwaves from gathering in one place when the microwave cooking device 100 is unloaded, resulting in excessive electric field strength at that place, which easily forms a breakdown voltage to generate an arc and a loud current sound, thereby reducing the risk of ignition problems.

[0046] Therefore, it can be understood that the technical solution of the present application can be provided with at least two microwave outlets 12 on the waveguide device 1 so that microwaves are uniformly output to all parts of the cavity 2 of the microwave cooking device 100, or at least two microwave feed ports 22 can be provided on the cavity 2 of the microwave cooking device 100 in the following embodiment so that microwaves are uniformly introduced and dispersed to the microwave heating cavity 21, so that there is no need to set a stirrer to disrupt and disperse the microwaves, thereby avoiding the potential safety hazards caused by stirrer failure. At the same time, when the waveguide device 1 is provided with at least two microwave outlets 12, the distance between two adjacent microwave outlets 12 is limited to be not less than 1 / 10 of the microwave waveguide wavelength, and when the cavity 2 is provided with at least two microwave feed ports 22, the distance between two adjacent microwave feed ports 22 is limited to be not less than 1 / 10 of the microwave waveguide wavelength, thereby avoiding the two adjacent microwave outlets 12 or two adjacent microwave feed ports 22 from being too close, so as to reduce the risk of ignition caused by the breakdown voltage generating arc when the microwave cooking device 100 is unloaded, thereby improving the safety of the microwave cooking device 100.

[0047] See alsoFigure 3 In one embodiment, the shape of the microwave outlet 12 is a polygon, and the number of sides of the microwave outlet 12 is not less than four.

[0048] In this embodiment, it is defined that the shape of the microwave outlet 12 is generally a polygon, and the number of sides of the microwave outlet 12 is not less than four. Among them, the number of sides of the microwave outlet 12 refers to the number of straight sides in the microwave outlet 12. That is, the shape of the microwave outlet 12 can be a quadrilateral, a pentagon, and other polygon structures. Adjacent two straight sides can be directly connected, or a rounded corner can be provided between the two straight sides, which is not limited here. This setting method avoids the microwave outlet 12 being circular, thereby reducing microwave diffraction and reducing microwave energy loss. In addition, when the microwave outlet 12 is set as a triangle, there are many acute angle positions, and microwave aggregation is likely to occur at the acute angle positions, resulting in too high an electric field strength at the acute angle positions, and it is relatively easy to form a breakdown voltage to generate an arc and a loud current sound. By setting the shape of the microwave outlet 12 as a polygon, the microwave energy loss can be reduced and the problem of excessive local electric field strength caused by microwave aggregation can be reduced, so that the microwave is fed into the microwave heating cavity 21 more evenly, ensuring the cooking effect.

[0049] Please refer to Figure 3 In one embodiment, the distance d between any two points on two non-adjacent sides of the microwave outlet 12 is d≥0.1λ.

[0050] Among them, the two non-adjacent sides refer to that the endpoints of the two straight sides are not directly connected, but are respectively connected to other straight sides, and the distance d between any two points on the two sides is d≥0.1λ. Such a setting can avoid the problem of microwave aggregation at the microwave outlet 12 due to the too close distance between the two non-adjacent sides of the microwave outlet 12, making the uniformity of the microwave better and the microwave not easy to aggregate, reducing the risk of sparking problems and improving the use safety.

[0051] In one embodiment, the number of sides of the microwave outlet 12 does not exceed 16. Such a setting method avoids the microwave outlet 12 approaching a circular shape, thereby being beneficial to reducing microwave diffraction, reducing microwave energy loss, improving microwave transmission efficiency, and ensuring the cooking effect.

[0052] Please refer to Figure 3 In one embodiment, a rounded corner is provided between two adjacent straight sides of the microwave outlet 12.

[0053] Such a setting can avoid the contour line of the microwave outlet 12 from appearing in a sharp form, and further avoid the electric field strength at the intersection position of the two straight sides from being too high, resulting in a sparking phenomenon at that place.

[0054] Please refer to Figure 3, in one embodiment, the extending direction of at least one microwave outlet 12 is set at an angle to the extending direction of the waveguide channel. In the present application, the extending direction of the waveguide channel refers to the direction from the microwave inlet 11 to the microwave outlet 12, and the transmission direction of the microwave in the waveguide channel, and this direction is defined as the first direction.

[0055] In the embodiment of the present application, a plurality of microwave outlets 12 can be provided on the contact surface of the waveguide device 1 for being oppositely arranged with the cavity 2, so that some of the microwave outlets 12 are arranged along the circumferential direction of the contact surface to be roughly adapted to the contour of the cavity 2; wherein, at least one of the microwave outlets 12 extends obliquely relative to the extending direction of the waveguide channel, or can be perpendicular to the extending direction of the waveguide channel, so that the microwave can be fed out more uniformly along the length direction and the width direction of the waveguide channel and enter the microwave heating cavity 21 uniformly, ensuring the cooking effect.

[0056] Please refer to Figure 3 , in some embodiments, at least two microwave outlets 12 are arranged along the width direction of the waveguide channel and are axially symmetrically distributed, and the axis of symmetry extends along the extending direction of the waveguide channel.

[0057] In the present application, the width direction of the waveguide channel is the second direction; in this embodiment, a straight line extending along the extending direction of the waveguide channel, i.e., the first direction, is used as the axis of symmetry, and the axis of symmetry can be the central axis of the waveguide device 1; and at least two of the microwave outlets 12 are arranged at intervals on both sides of the axis of symmetry along the second direction and are axially symmetrically arranged with respect to the axis of symmetry; thus arranged, it is beneficial to make the microwave evenly distributed and fed into the microwave heating cavity 21 evenly from both sides of the axis of symmetry. Optionally, two symmetrically arranged microwave outlets 12 can be provided in the waveguide device 1; three microwave outlets 12 can also be provided, with two of the microwave outlets 12 being symmetrically arranged; four microwave outlets 12 that are symmetrically arranged in pairs can also be provided, and in addition, five or more microwave outlets 12 can be provided, which are not limited herein.

[0058] In one embodiment, taking the extending direction of the waveguide channel as the first direction and the width direction of the waveguide channel as the second direction, the waveguide device 1 is provided with four microwave outlets 12; the four microwave outlets 12 include two first outlets 121 arranged side by side along the second direction and axially symmetrically distributed, and two second outlets 122 arranged side by side along the second direction and axially symmetrically distributed, and the first outlets 121 and the second outlets 122 are arranged side by side along the first direction.

[0059] In this embodiment, four microwave output ports 12 are provided on the same surface of the waveguide device 1. The four microwave output ports 12 include two first output ports 121 and two second output ports 122. Along the first direction, the two second output ports 122 are located on the side of the two first output ports 121 away from the microwave input port. The two first output ports 121 are arranged side by side along the second direction and are axially symmetrically arranged. The two second output ports 122 are arranged side by side along the second direction and are axially symmetrically arranged. With this arrangement, a relatively small number of microwave output ports 12 can be used to roughly cover the output area corresponding to the cavity 2. Moreover, the two first output ports 121 are symmetrically arranged and the two second output ports 122 are symmetrically arranged, so that microwaves can be evenly fed out in the width direction of the waveguide channel. Among them, the shapes of the first output port 121 and the second output port 122 can be designed according to the shape of the cavity 2, so that the shape arrangement of the four microwave output ports 12 roughly matches the shape of the cavity 2, and thus microwaves can be evenly fed into the cavity 2. Optionally, the shapes of the first output port 121 and the second output port 122 can be the same, for example, axially symmetrically arranged or in an array arrangement; the shapes of the first output port 121 and the second output port 122 can also be different, which will not be elaborated here.

[0060] In one embodiment, along the direction close to the second output port 122, the first output port 121 extends obliquely away from the other first output port 121, and the first output port 121 is arranged as a rectangular structure or an approximately rectangular structure.

[0061] In this embodiment, the first output port 121 can be arranged as a rectangular structure or approximately as a rectangular structure, that is, the first output port 121 can have at least four straight sides. The at least four straight sides can be connected end to end in sequence. Adjacent two straight sides can be directly connected to form a sharp corner, or can also be transitioned through a rounded corner or a chamfer. Among them, taking the length direction of the first output port 121 as its extension direction, the first output port 121 extends along the direction close to the second output port 122 and away from the other first output port 121. With this arrangement, the two first output ports 121 cover a large area in the length and width directions of the waveguide channel, which is beneficial to evenly feeding out microwaves from different positions.

[0062] In one embodiment, the second output port 122 extends along the second direction, and a chamfered edge is provided at the corner of the second output port 122 away from the first output port 121 and the other second output port 122.

[0063] In this embodiment, the second wave outlet 122 extends along the width direction of the waveguide channel, i.e., the second direction shown in the figure. Among them, the second wave outlet 122 is generally arranged in a pentagonal structure, including at least five straight edges connected end to end. Optionally, the five straight edges include a first straight edge adjacent to another second wave outlet 122, a second straight edge arranged opposite to the first straight edge, a third straight edge and a fourth straight edge arranged along the first direction, and a fifth straight edge connecting the second straight edge and the fourth straight edge. The two ends of the third straight edge are respectively connected to the first straight edge and the second straight edge. One end of the fourth straight edge far from the fifth straight edge is connected to the first straight edge. The second straight edge is shorter than the first straight edge, and the fourth straight edge is shorter than the third straight edge. At this time, the fifth straight edge forms a chamfered edge. In this setting method, when the shape of the bottom of the cavity 2 is an approximate shape such as a circle, a square or a rectangle, the second wave outlet 122 can be approximately shaped to the contour of the cavity 2 while covering a large area, so that microwaves can be evenly fed into the cavity 2 from the second wave outlet 122. Among them, adjacent straight edges can be directly connected to form a sharp angle, or can be transitioned through a fillet or a chamfer.

[0064] Please refer to Figure 1 and Figure 2 , this application also proposes a cavity 2 of a microwave cooking appliance 100. The cavity 2 forms a microwave heating cavity 21. The cavity 2 is provided with at least two microwave feed inlets 22 communicating with the microwave heating cavity 21. The at least two microwave feed inlets 22 are opened on the same surface. The edge distance between two adjacent microwave feed inlets is L1, and the waveguide wavelength of the microwaves fed into the cavity 2 is λ, satisfying L1≥0.1λ.

[0065] The cavity 2 proposed in this application is used in the microwave cooking appliance 100 and forms a microwave heating cavity 21. Among them, the cavity 2 can be a microwave heating cavity 21 with an opening at the top, and a cover body 4 is correspondingly provided to close the microwave heating cavity 21. The cavity 2 can also be a microwave heating cavity 21 with an opening on the side, and a door body that can be opened and closed is correspondingly provided to cooperate with the cavity 2. The cavity 2 is provided with a microwave feed inlet 22 communicating with the microwave heating cavity 21. The cavity 2 is usually made of a metal material, a metal matrix composite material or other materials with microwave shielding functions, so as to avoid microwave leakage during the process of microwave cooking with the microwave heating cavity 21 closed.

[0066] The cavity 2 is provided with at least two microwave feed ports 22 connected to the microwave heating cavity 21. Each microwave feed port 22 is provided on the same surface of the cavity 2, and can be provided on the bottom surface of the cavity 2. In some embodiments, when the side surface of the cavity 2 is a plane, it can also be provided on the side surface of the cavity 2. When the cavity 2 is applied to the microwave cooking apparatus 100, the surface provided with the microwave feed port 22 is arranged opposite to the waveguide device 1, so that the microwave outlet 12 of the waveguide device 1 is arranged opposite to and connected to the microwave feed port 22 of the cavity 2, so that the microwave generated by the microwave generating device 3 can be coupled to the microwave heating cavity 21 through the waveguide device 1 and the microwave feed port 22; wherein, a larger microwave outlet 12 can be provided in the waveguide device 1 to cover each microwave feed port 22 of the cavity 2, or at least two microwave outlets 12 can be provided in the waveguide device 1 to be connected to each microwave feed port 22, respectively, without limitation here. The number and arrangement of the microwave feed ports 22 can be set in accordance with the surface shape of the cavity 2, so that microwaves are evenly fed from the microwave feed ports 22 into the microwave heating cavity 21 to heat the food, thereby ensuring the cooking effect.

[0067] In the embodiment of the present application, the distance between two adjacent microwave feed inlets 22 on the cavity 2 is limited, and the distance between any two points on the edge of the two adjacent microwave feed inlets 22 is defined as L1. The waveguide wavelength of the microwave fed into the microwave heating cavity 21 is λ, and L1 ≥ 0.1λ is required. Such a setting can avoid the two adjacent microwave feed inlets 22 being too close, and can prevent microwaves from gathering in one place when the microwave cooking appliance 100 is unloaded, resulting in excessive electric field strength at that place, which easily forms a breakdown voltage to generate an arc and a loud current sound, thereby reducing the risk of ignition problems.

[0068] See also Figure 2 In one embodiment, the shape of the microwave feed port 22 is a polygon, and the number of sides of the microwave feed port 22 is not less than four.

[0069] This arrangement avoids setting the microwave feed inlet 22 to be circular, thereby reducing microwave diffraction and microwave energy loss; in addition, it avoids setting the microwave feed inlet 22 to be triangular with too many acute angles, where microwaves are easily concentrated and the electric field strength is too high, which makes it easier to form a breakdown voltage, produce arcs and loud current sounds; and the shape of the microwave feed inlet 22 is set to a polygon with at least four straight sides, such as a quadrilateral, pentagon or other polygonal structure, and two adjacent straight sides can be directly connected or rounded transition can be set. This arrangement can reduce microwave energy loss and reduce the problem of excessive local electric field strength due to microwave concentration, so that microwaves are more evenly fed into the microwave heating cavity 21 to ensure the cooking effect.

[0070] See also Figure 2, in one embodiment, the distance d1 between any two points on two non - adjacent sides of the microwave feed inlet 22 is d1≥0.1λ.

[0071] Among them, the two non - adjacent sides refer to two straight sides whose endpoints are not directly connected, but are respectively connected to other straight sides, so that the distance d1 between any two points on the two sides is d1≥0.1λ; with such a setting, it is possible to avoid the problem of microwave aggregation at the microwave feed inlet 22 due to the too - close distance between the two non - adjacent sides of the microwave feed inlet 22, making the uniformity of the microwave better and the microwave not easily aggregated, reducing the risk of arcing problems, and improving the use safety.

[0072] In one embodiment, the number of sides of the microwave feed inlet 22 does not exceed 16; this setting method avoids the microwave feed inlet 22 approaching a circular shape, which is beneficial to reducing microwave diffraction, reducing microwave energy loss, improving microwave transmission efficiency, and ensuring the cooking effect.

[0073] Please refer to Figure 2 , in one embodiment, there is a fillet between two adjacent straight sides of the microwave feed inlet 22.

[0074] With such a setting, it is possible to avoid a sharp shape of the contour line of the microwave feed inlet 22, and further avoid too high an electric field strength at the intersection position of the two straight sides, resulting in arcing at that place.

[0075] Please refer to Figure 2 , in one embodiment, at least two microwave feed inlets 22 are axially symmetrically distributed. With such a setting, it is beneficial to make the microwave evenly distributed and fed into the microwave heating cavity 21, improving the cooking effect.

[0076] Please refer to Figure 1 and Figure 2 , in one embodiment, the microwave feed inlet 22 is opened on the bottom surface of the cavity 2. With such a setting, when the cavity 2 is applied to the microwave cooking appliance 100, at least part of the waveguide device 1 can be arranged below the cavity 2, thereby reducing the size of the microwave cooking appliance 100 in the cross - sectional direction. At the same time, the microwave is fed into the microwave heating cavity 21 from the bottom, which is beneficial to the uniform diffusion of microwave energy to the microwave heating cavity 21, better heating the food materials, and improving the cooking effect.

[0077] In some embodiments, the microwave output ports 12 provided on the waveguide device 1 include a first output port 121 and a second output port 122, and the microwave feed inlets 22 provided on the cavity 2 can be in one - to - one correspondence and contour - imitation setting with each microwave output port 12, which is beneficial to better feeding the microwave from the waveguide device 1 into the cavity 2.

[0078] Please refer to Figures 1 to 3, the present application also provides a microwave cooking appliance 100, which includes a microwave generating device, a waveguide device 1, and a cavity 2. The microwave generating device is connected to the microwave inlet 11 of the waveguide device 1, and the microwave outlet 12 of the waveguide device 1 is communicated with the microwave feed inlet 22 of the cavity 2. Wherein, the waveguide device 1 is the waveguide device 1 in any of the foregoing embodiments; and / or, the cavity 2 is the cavity 2 in any of the foregoing embodiments.

[0079] Specifically, the microwave cooking appliance 100 can be a microwave oven or a microwave rice cooker, etc.

[0080] The microwave cooking appliance 100 includes a microwave generating device for generating microwaves, a waveguide device 1 for conducting microwaves, and a cavity 2 forming a microwave heating cavity 21. Wherein, the microwave generating device can be a magnetron; the cavity 2 forms a microwave heating cavity 21 and is provided with a microwave feed inlet 22 communicating with the microwave heating cavity 21; a waveguide channel for guiding microwave traveling waves is formed in the waveguide device 1, and a microwave inlet 11 and a microwave outlet 12 communicating with the conduction channel are provided. The microwave inlet 11 is used to communicate with the microwave generating device, and the microwave outlet 12 is communicated with the microwave feed inlet 22 of the cavity 2. The microwave generating device can feed microwaves into the waveguide channel, and the microwaves are transmitted through reflection and refraction on the inner wall of the waveguide channel, and finally the microwaves are coupled into the microwave heating cavity 21 through the microwave outlet 12 and the microwave feed inlet 22.

[0081] The cavity 2 can be a structure forming a microwave heating cavity 21 with an opening at the top, and a cover 4 is correspondingly provided to close the microwave heating cavity 21; the cavity 2 can also be a structure forming a microwave heating cavity 21 with an opening at the side, and a door that can be opened and closed is correspondingly provided to cooperate with the cavity 2. The cavity 2 is usually made of a metal material, a metal matrix composite material or other materials with microwave shielding functions, so as to prevent microwave leakage during the process of closing the microwave heating cavity 21 for microwave cooking. In some embodiments, the microwave cooking appliance 100 further includes an inner container disposed in the microwave heating cavity 21, and the inner container is used to hold food materials, and the microwaves can penetrate the inner container and react with the food materials to heat the food materials.

[0082] In the embodiments of the present application, the microwave cooking appliance 100 can adopt at least one of the waveguide device 1 and the cavity 2 in the foregoing embodiments, and the specific structures of the waveguide device 1 and the cavity 2 refer to the above embodiments.

[0083] If only the waveguide device 1 in the foregoing embodiments is adopted, a relatively large microwave feed port 22 may be opened in the cavity 2 to cover each microwave output port 12 of the waveguide device 1; if only the cavity 2 in the foregoing embodiments is adopted, relatively large microwave output ports 12 may be opened on the waveguide device 1 to communicate with each microwave feed port 22 of the cavity 2. Of course, the waveguide device 1 and the cavity 2 in the foregoing embodiments may be adopted simultaneously. Each microwave output port 12 opened on the waveguide device 1 communicates with the microwave feed port 22 opened on the cavity 2 respectively. The microwave output ports 12 opened on the waveguide device 1 and the microwave feed ports 22 opened on the cavity 2 may be in one-to-one correspondence and have the same shape, or the microwave output ports 12 opened on the waveguide device 1 and the microwave feed ports 22 opened on the cavity 2 may have different shapes, which is not specifically limited herein.

[0084] Since the microwave cooking appliance 100 proposed in this application adopts all the technical solutions of at least some of the foregoing embodiments of the waveguide device 1 and the cavity 2, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0085] In some embodiments of this application, when the microwave cooking appliance 100 is a microwave rice cooker, the cavity 2 forms a microwave heating cavity 21 with an open top, and a cover 4 is provided in the microwave cooking appliance 100 to close the microwave heating cavity 21, and the cover 4 is configured to be openable and closable. The microwave cooking appliance 100 may further be provided with an inner container that can be placed in the microwave heating cavity 21. The inner container is used to hold food materials. Microwaves can penetrate the inner container and react with the food materials to heat the food materials, thereby completing the rice cooking process. A steam valve may be provided on the cover 4. The steam valve can communicate the internal and external spaces of the microwave heating cavity 21 during exhaust to adjust the pressure in the area where the food materials are placed in the microwave heating cavity 21, so as to stabilize the air pressure in the microwave rice cooker and avoid excessive pressure.

[0086] When the cover 4 covers the cavity 2, the inside of the microwave heating cavity 21 may be in an atmospheric pressure state; or the pressure inside the microwave heating cavity 21 may be greater than the ambient pressure outside the microwave rice cooker. In other words, the microwave rice cooker may also be a pressure cooker. When the cover 4 covers the cavity 2, a micro-pressure or high-pressure environment can be formed in the microwave heating cavity 21.

[0087] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A waveguide device, characterized in that, The waveguide device forms a waveguide channel, and is provided with a microwave inlet and at least two microwave outlets communicating with the waveguide channel, and at least two of the microwave outlets are provided on the same surface; The distance between any two points on the edges of two adjacent microwave outlets is L, and the waveguide wavelength of the microwave transmitted by the waveguide device is λ, satisfying L≥0.1λ.

2. The waveguide device according to claim 1, wherein The shape of the microwave outlet is polygonal, and the number of sides of the microwave outlet is not less than four.

3. The waveguide device according to claim 2, characterized in that, The distance d between any two points on two non-adjacent sides of the microwave outlet is ≥0.1λ; and / or, the number of sides of the microwave outlet does not exceed 16; and / or, a fillet is provided between two adjacent straight sides of the microwave outlet.

4. The waveguide device according to any one of claims 1 to 3, characterized in that The extending direction of at least one microwave outlet forms an angle with the extending direction of the waveguide channel; and / or, at least two microwave outlets are arranged along the width direction of the waveguide channel and are axially symmetrically distributed, and the axis of symmetry extends along the extending direction of the waveguide channel.

5. The waveguide device according to any one of claims 1 to 3, characterized in that, Taking the extending direction of the waveguide channel as the first direction and the width direction of the waveguide channel as the second direction, the waveguide device is provided with four microwave outlets; The four microwave outlets include two first outlets arranged side by side along the second direction and axially symmetrically distributed, and two second outlets arranged side by side along the second direction and axially symmetrically distributed, and the first outlet and the second outlet are arranged side by side along the first direction.

6. The waveguide device according to claim 5, wherein, Along the direction close to the second outlet, the first outlet extends obliquely away from the other first outlet, and the first outlet is arranged as a rectangular structure or an approximately rectangular structure; and / or, the second outlet extends along the second direction, and a chamfered edge is provided at the corner of the second outlet away from the first outlet and the other second outlet.

7. A cavity of a microwave cooking appliance, characterized in that, The cavity forms a microwave heating cavity, and the cavity is provided with at least two microwave feed inlets communicating with the microwave heating cavity, and at least two of the microwave feed inlets are provided on the same surface; The edge distance between two adjacent microwave feed inlets is L1, and the waveguide wavelength of the microwave fed into the cavity is λ, satisfying L1≥0.1λ.

8. The cavity according to claim 7, characterized in that, The shape of the microwave feed inlet is polygonal, and the number of sides of the microwave feed inlet is not less than four.

9. The cavity according to claim 8, wherein, The distance d1 between any two points on two non-adjacent sides of the microwave feed inlet is ≥0.1λ; and / or, the number of sides of the microwave feed inlet does not exceed 16; and / or, a fillet is provided between two adjacent straight sides of the microwave feed inlet.

10. The cavity according to any one of claims 7 to 9, characterized in that, At least two microwave feed inlets are axially symmetrically distributed; and / or, the microwave feed inlet is provided on the bottom surface of the cavity.

11. A microwave cooking appliance, characterized in that, The microwave cooking appliance includes a microwave generating device, a waveguide device and a cavity, the microwave generating device is connected to the microwave inlet of the waveguide device, and the microwave outlet of the waveguide device is communicated with the microwave feed inlet of the cavity; Wherein, the waveguide device is the waveguide device as described in any one of claims 1 to 6; and / or, the cavity is the cavity as described in any one of claims 7 to 10.

12. The microwave cooking appliance according to claim 11, wherein, The microwave cooking appliance is a microwave rice cooker. The microwave heating cavity of the cavity has an opening. The microwave rice cooker further includes a lid. The lid is disposed at the opening of the microwave heating cavity in a manner that it can be opened and closed. A steam valve is provided on the lid. The steam valve can communicate the inner and outer spaces of the microwave heating cavity when exhausting.

Images