Magnetron and cooking utensil

Abstract

The magnetron comprises a shell, an anode assembly and a cathode assembly, the anode assembly is arranged in the shell and provided with a penetrating channel, the cathode assembly is arranged in the shell and comprises a cathode filament, the cathode filament is arranged in the penetrating channel, the cathode filament and the inner wall of the penetrating channel are arranged in a spaced mode, and the cathode filament is arranged in the penetrating channel. The cathode filament is of a spiral structure in the extending direction of the penetrating channel, the spiral structure comprises at least two circles of spiral bodies, each circle of spiral body is provided with at least one protruding part, and the protruding parts protrude in the direction close to the inner wall of the penetrating channel. According to the magnetron, the cathode filament of the magnetron is of the spiral structure, the protruding part is arranged on the spiral body of the spiral structure, and therefore the distances between the cathode filament and the inner wall of the penetrating channel are different. When the cathode filament works, generated electrons are disturbed by an electric field to present a non-uniform state, the electrons are very easy to cluster, and the oscillation starting time of the magnetron is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a magnetron and a cooking utensil. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Microwave cooking appliances (microwave ovens or microwave ovens, etc.) usually include a body and a magnetron. The magnetron is installed in the body. The magnetron generates microwaves and feeds the microwaves into a cooking cavity of the body to heat and cook the ingredients in the cooking cavity using the microwaves.

[0004] The cathode filament of the existing magnetron is spiral-shaped. When the spiral cathode filament is working, the electric field disturbance to which the generated electrons are subjected is relatively uniform, making it difficult for the electrons to cluster, thus causing the magnetron to exhibit problems such as a long start-up time. Summary of the invention

[0005] The purpose of the present invention is to at least solve the problem of long start-up time of the magnetron. This purpose is achieved by the following technical solutions:

[0006] The present invention provides a magnetron, comprising:

[0007] case;

[0008] an anode assembly, the anode assembly being disposed in the shell and having a penetration passage;

[0009] A cathode assembly, wherein the cathode assembly is arranged in the shell, and the cathode assembly includes a cathode filament, wherein the cathode filament is arranged in the penetration channel and spaced apart from the inner wall of the penetration channel, and along the extension direction of the penetration channel, the cathode filament is in a spiral structure, and the spiral structure includes at least two turns of a spiral body, and at least one turn of the spiral body is provided with at least one turn of a raised portion, and the at least one turn of the raised portion protrudes toward the inner wall of the penetration channel.

[0010] According to the magnetron of the present invention, the cathode filament of the magnetron is in a spiral structure, and a protrusion is arranged on the spiral body of the spiral structure, so that the distance between the cathode filament and the inner wall of the penetration channel is different, that is, the protrusion is close to the inner wall of the penetration channel, and the position of the cathode filament without the protrusion is farther away from the inner wall of the penetration channel than the protrusion. When the cathode filament is working, the protrusion is arranged so that the generated electrons are disturbed by the electric field and present an uneven state, and the electrons are very likely to cluster, thereby shortening the start-up time of the magnetron.

[0011] In addition, the magnetron according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, the anode assembly is provided with a resonant cavity, and the resonant cavity is located radially outside the spiral structure and is connected to the penetration channel.

[0013] In some embodiments of the present invention, there are multiple resonant cavities, and all of the resonant cavities are arranged at intervals along the circumference of the spiral structure.

[0014] In some embodiments of the present invention, the number of the protrusions located in one circle of the spiral body is plural, and the protrusions located in one circle of the spiral body correspond one-to-one to the resonant cavity.

[0015] In some embodiments of the present invention, each of the at least two spirals is provided with the protrusion.

[0016] In some embodiments of the present invention, the number of the protrusions in two adjacent turns of the spiral is the same or different.

[0017] In some embodiments of the present invention, along the axial direction of the spiral structure, the protrusions on two adjacent turns of the spiral body are correspondingly arranged;

[0018] Alternatively, along the axial direction of the spiral structure, the protrusions on two adjacent circles of the spiral body are staggered.

[0019] In some embodiments of the present invention, the protrusion is in a U-shape, a rectangle, an arc or a triangle.

[0020] In some embodiments of the present invention, the magnetron further comprises a magnetic circuit assembly, and the magnetic circuit assembly comprises:

[0021] A bracket, wherein the bracket has a receiving space, the housing is plugged and matched with the bracket, and the cathode filament is correspondingly arranged in the receiving space;

[0022] A first magnetic member, which is fixed on the inner side of the bracket and located on one side of the cathode filament;

[0023] The second magnetic member is fixed on the inner side of the bracket and is located on the other side of the cathode filament. The magnetic direction of the first magnetic member is opposite to that of the second magnetic member. The bracket, the first magnetic member and the second magnetic member form a closed magnetic circuit.

[0024] A second aspect of the present invention provides a cooking appliance, comprising the magnetron as described above.

[0025] According to the cooking utensil of the present invention, the cathode filament of the magnetron is in a spiral structure, and a protrusion is arranged on the spiral body of the spiral structure, so that the distance between the cathode filament and the inner wall of the penetration channel is different, that is, the protrusion is close to the inner wall of the penetration channel, and the position of the cathode filament without the protrusion is farther away from the inner wall of the penetration channel than the protrusion. When the cathode filament is working, the protrusion is arranged so that the generated electrons are disturbed by the electric field and present an uneven state, and the electrons are very likely to cluster, thereby shortening the start-up time of the magnetron. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 Schematically shows a partial structural diagram of a cooking appliance according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A structural cross-sectional view of a magnetron of a cooking appliance shown in ;

[0029] Figure 3 for Figure 2 A schematic diagram of a partial structure of a magnetron shown;

[0030] Figure 4 for Figure 3 A schematic diagram of a partial structure of the structure shown in ;

[0031] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the structure shown in FIG.

[0032] Figure 6 for Figure 2 A partial cross-sectional view of a magnetron shown in FIG. 1 (showing only a portion of the cathode filament and anode assembly);

[0033] Figure 7 is a schematic structural diagram of a first embodiment of a cathode filament;

[0034] Figure 8 is a schematic structural diagram of a second embodiment of a cathode filament;

[0035] Fig. 9 is a schematic structural diagram of a third embodiment of a cathode filament;

[0036] Fig.10It is a schematic structural diagram of a fourth embodiment of a cathode filament.

[0037] The reference numerals are as follows:

[0038] 100 for cooking utensils;

[0039] 10 is the body;

[0040] 11 is a cooking cavity;

[0041] 20 is a microwave generating component;

[0042] 21 is a magnetron;

[0043] 211 is a magnetic circuit component;

[0044] 2111 is a first magnetic member, 2112 is a bracket, and 2113 is a second magnetic member;

[0045] 212 is a heat dissipation component;

[0046] 213 is a housing;

[0047] 214 is a cathode assembly;

[0048] 2141 is the cathode filament;

[0049] 2141a is a spiral body, 2141b is a protrusion;

[0050] 215 is an anode assembly;

[0051] 2151 is a penetration channel, 2152 is a resonance cavity;

[0052] 22 is a waveguide;

[0053] 23 is a stirring member. DETAILED DESCRIPTION

[0054] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0056] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0057] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0058] like Figures 1 to 10 As shown, according to an embodiment of the present invention, a magnetron 21 is provided. The magnetron 21 includes a cathode assembly 214 , an anode assembly 215 and a housing 213 .

[0059] The anode assembly 215 and the cathode assembly 214 are respectively arranged in the shell 213, wherein a penetration channel 2151 is provided in the anode assembly 215, and a partial structure of the cathode assembly 214 is penetrated in the penetration channel 2151 of the anode assembly 215, and the cathode assembly 214 includes a cathode filament 2141, and the cathode filament 2141 is located inside the penetration channel 2151, and the inner wall of the penetration channel 2151 is spaced apart from the cathode filament 2141.

[0060] The cathode filament 2141 is a spiral structure, and the spiral axis of the spiral structure is consistent with the axis direction of the channel 2151. The cathode filament 2141 with a spiral structure has a spiral body 2141a, and the number of spiral bodies 2141a is at least two turns. Among the spiral bodies 2141a with at least two turns, at least one turn of the spiral body 2141a is provided with a protrusion 2141b (such as Figure 6 As shown, the protruding direction of the protrusion 2141b is from one side of the spiral axis of the spiral structure to one side of the inner wall of the penetration channel 2151), and the number of the protrusion 2141b is at least one.

[0061] Specifically, the cathode filament 2141 of the magnetron 21 has a spiral structure, and a protrusion 2141b is arranged on the spiral body 2141a of the spiral structure, so that the distance between the cathode filament 2141 and the inner wall of the penetration channel 2151 is different, that is, the protrusion is located close to the inner wall of the penetration channel 2151, and the position of the cathode filament 2141 without the protrusion 2141b is arranged farther away from the inner wall of the penetration channel 2151 than the protrusion 2141b.

[0062] When the cathode filament 2141 is working, the protrusion 2141 b is provided so that the generated electrons are disturbed by the electric field and present an uneven state, and the electrons are very likely to cluster, thereby shortening the oscillation time of the magnetron 21 .

[0063] It should be understood that in the prior art, the cathode filament 2141 is coaxially arranged in the penetration channel 2151, and the cathode filament 2141 is at the same distance from the inner wall of the penetration channel 2151. When the cathode filament 2141 is working, the electrons generated by the cathode filament 2141 are acted on in the same direction by the electric field, which makes it difficult for the electrons to cluster, causing microwaves of different frequencies to compete with each other and the competition is fierce. At the same time, microwaves of other frequencies interfere with microwaves of the required frequency, resulting in a long start-up time of the magnetron 21. However, the cathode filament 2141 in the present invention, by providing the protrusion 2141b, makes the distance from the cathode filament 2141 to the inner wall of the penetration channel 2151 different, so that the generated electrons are disturbed by the electric field and present an uneven state, and the electrons are very likely to cluster. Compared with the prior art, the start-up time of the magnetron 21 can be effectively shortened.

[0064] It should be noted that the penetration channel 2151 is opened on the anode assembly 215 and has a cylindrical structure. The spiral axis of the cathode filament 2141 with a spiral structure is in the same direction as the axis of the cylindrical structure.

[0065] In some embodiments of the present invention, Figure 3 and Figure 6 As shown, the spiral axis of the spiral structure coincides with the axis of the cylindrical structure, thereby facilitating assembly and effectively improving assembly efficiency.

[0066] In some embodiments of the present invention, the spiral axis of the spiral structure is arranged in parallel with the axis of the cylindrical structure. By arranging the spiral axis of the spiral structure in parallel with the axis of the cylindrical structure, the distance between the cathode filament 2141 of the spiral structure and the inner wall of the passage 2151 is further made unequally spaced, thereby further enhancing the uneven state of electrons during the operation of the cathode filament 2141, further enhancing the clustering of electrons, and further shortening the starting time of the magnetron 21.

[0067] In addition, the housing 213 is made of non-metallic material to avoid discharge. In the present invention, the housing 213 is made of glass and is evacuated to eliminate the influence of air on the electrons.

[0068] It is further understood that in the embodiment of the present invention, a resonant cavity 2152 is formed on the anode assembly 215 , wherein the resonant cavity 2152 is connected to the penetration channel 2151 and is located radially outside the cathode filament 2141 having a spiral structure.

[0069] Specifically, when the magnetron 21 is in operation, the cathode filament 2141 is energized and heated, and the electrons released by the cathode filament 2141 enter the penetration channel 2151 and the resonant cavity 2152. By setting the resonant cavity 2152, the electrons oscillate at their resonant frequency, thereby forming an electron beam and realizing the output of microwaves.

[0070] It should be noted that along the direction perpendicular to the axial direction of the penetrating channel 2151, the resonant cavity 2152 has a cross section, which includes but is not limited to a fan-shaped (such as Figure 6 As shown, ), rectangle, U-shape and triangle, etc.

[0071] Furthermore, if Figure 6 As shown, in an embodiment of the present invention, the anode assembly 215 has a plurality of resonant cavities 2152, and all the resonant cavities 2152 are arranged at intervals along the circumference of the cathode filament 2141 having a spiral structure.

[0072] By providing a plurality of resonant cavities 2152 , the resonance capability for electrons is improved, the oscillation start-up time of the magnetron 21 can be further shortened, and the overall microwave output power of the magnetron 21 can be increased.

[0073] It should be noted that the distribution of the multiple resonant cavities 2152 in the circumferential direction of the cathode filament 2141 can be arranged at equal intervals or at unequal intervals.

[0074] In an embodiment of the present invention, the distribution of multiple resonant cavities 2152 in the circumferential direction of the cathode filament 2141 can be arranged at equal intervals. By arranging them at equal intervals, the structure around the cathode filament 2141 is made uniform, which can further ensure the resonance effect on electrons, so that the electrons can resonate at a preset frequency, thereby ensuring the overall performance of the magnetron 21.

[0075] In addition, in the present invention, a plurality refers to two or more. Specifically, the plurality of resonant cavities 2152 may be two resonant cavities 2152, three resonant cavities 2152, four resonant cavities 2152, five resonant cavities 2152, six resonant cavities 2152, seven resonant cavities 2152, eight resonant cavities 2152, etc. The number of resonant cavities 2152 may be set according to specific requirements.

[0076] like Figure 5 As shown, the number of the resonant cavities 2152 shown in the drawings of the specification of the present invention is five, and the five resonant cavities 2152 are arranged at equal intervals along the circumference of the cathode filament 2141, and the central angle formed between two adjacent resonant cavities 2152 is 72°.

[0077] Furthermore, if Figure 5 As shown, in an embodiment of the present invention, there are multiple resonant cavities 2152 on the anode assembly 215, the cathode filament 2141 is in a spiral structure, and the spiral structure has multiple (two or more) spirals 2141a, and the protrusion 2141b is arranged on the spiral 2141a. The same circle of spiral 2141a has multiple protrusions 2141b (consistent with the number of resonant cavities 2152), and the protrusions 2141b on the same circle of spiral 2141a are arranged one by one with the resonant cavities 2152.

[0078] By providing the same number of protrusions 2141b as the resonant cavity 2152 and providing the protrusions 2141b corresponding to the resonant cavity 2152, and by providing a plurality of protrusions 2141b, more protrusions are provided on the cathode filament 2141, and the unequal distances between the cathode filament 2141 and the inner wall of the penetration channel 2151 are further increased, so that the clustering speed of the electrons generated by the cathode filament 2141 is further accelerated, thereby further shortening the starting time of the magnetron 21.

[0079] In addition, a plurality of resonant cavities 2152 are provided on the anode assembly 215, and the protrusions 2141b are provided in one-to-one correspondence with the resonant cavities 2152, so that when the cathode filament 2141 is in operation, the electrons generated can quickly enter the resonant cavity 2152, thereby effectively shortening the start-up time of the magnetron 21.

[0080] It should be noted that, in the embodiment of the present invention, the cathode filament 2141 is wound by a thoriated tungsten metal wire to form a spiral structure, and during the winding process, the protrusion 2141b is formed by bending in the radially outer direction of the axis of the winding structure.

[0081] Further, in the embodiment of the present invention, the structural shape of the protrusion 2141b includes but is not limited to a U-shape (such as Figure 6 and Figure 7 As shown), rectangle (as Figure 8 As shown), arc (as Fig. 9 as shown) or a triangle (as Fig.10 shown).

[0082] By setting the structural shape of the protrusion 2141 b , the structure of the protrusion 2141 b can be more adapted to the structure of the resonant cavity 2152 , further ensuring that the magnetron 21 has good performance.

[0083] Taking a spiral 2141a with five protrusions 2141b and a U-shape as an example, during the winding process of the thoriated tungsten wire, the thoriated tungsten wire is bent once every 36°, so that the spiral 2141a has a petal-shaped structure.

[0084] In addition, if Figures 2 to 5 As shown, the number of the spiral bodies 2141a of the spiral structure can be two, three, four, five, six, ... In the embodiment of the present invention, the number of the spiral bodies 2141a is 11 layers, which can meet the use requirements of the existing magnetron 21 and improve the versatility of the cathode filament 2141.

[0085] Further, the cathode filament 2141 is in a spiral structure, and the spiral structure includes at least two turns of the spiral body 2141a. Taking the spiral body 2141a as having 11 turns as an example, the protrusion 2141b can be provided on one turn of the spiral body 2141a, and the protrusion 2141b can also be provided on multiple turns (two turns, three turns, four turns, five turns, six turns, seven turns, eight turns, nine turns, ten turns, eleven turns) of the spiral body 2141a.

[0086] In an embodiment of the present invention, a protrusion 2141b is provided on each circle of the spiral body 2141a. By providing a protrusion 2141b on each circle of the spiral body 2141a, more protrusions are provided on the cathode filament 2141, and the unequal distances between the cathode filament 2141 and the inner wall of the penetration channel 2151 are further increased, so that the clustering speed of the electrons generated by the cathode filament 2141 is further accelerated, thereby further shortening the starting time of the magnetron 21.

[0087] In some embodiments of the present invention, the cathode filament 2141 is in a spiral structure, which includes at least two spirals 2141a, and each spiral 2141a is provided with a protrusion 2141b, and the number of protrusions 2141b of two adjacent spirals 2141a is the same. By setting the number of protrusions 2141b on two adjacent spirals 2141a to be the same, the processing and manufacturing of the cathode filament 2141 is facilitated, thereby effectively reducing the manufacturing cost.

[0088] In some examples of this embodiment, the number of protrusions 2141b on two adjacent spirals 2141a is the same, and in the axial direction of the spiral structure, the protrusions 2141b on two adjacent spirals 2141a are arranged corresponding to each other.

[0089] By setting the positions of the protrusions 2141b on two adjacent spiral turns 2141a, the manufacturing difficulty of the cathode filament 2141 is reduced, so that the manufacturing cost of the cathode filament 2141 is effectively reduced, thereby reducing the overall manufacturing cost of the magnetron 21.

[0090] In some examples of this embodiment, the number of protrusions 2141b on two adjacent spirals 2141a is the same, and in the axial direction of the spiral structure, the protrusions 2141b on two adjacent spirals 2141a are staggered.

[0091] By setting the position of the protrusion 2141b on two adjacent turns of the spiral body 2141a, the unequal distance between the cathode filament 2141 and the inner wall of the penetration channel 2151 is further increased, so that the clustering speed of the electrons generated by the cathode filament 2141 is further accelerated, thereby further shortening the starting time of the magnetron 21.

[0092] In some embodiments of the present invention, the cathode filament 2141 is in a spiral structure, which includes at least two spirals 2141a, and each spiral 2141a is provided with a protrusion 2141b, and the number of protrusions 2141b of two adjacent spirals 2141a is different.

[0093] By setting the number of protrusions 2141b on two adjacent turns of the spiral body 2141a to be different, the protrusions 2141b on the cathode filament 2141 have more variable structures, which can make the cathode filament 2141 and the inner wall of the penetration channel 2151 have more unequal distance positions, so that the clustering speed of the electrons generated by the cathode filament 2141 is further accelerated, thereby further shortening the starting time of the magnetron 21.

[0094] Furthermore, if Figure 2 As shown, the magnetron 21 further includes a magnetic circuit assembly 211 , and the magnetic circuit assembly 211 includes a bracket 2112 , a first magnetic component 2111 and a second magnetic component 2113 .

[0095] Specifically, a receiving space is provided on the bracket 2112, and a shell 213 provided with a cathode assembly 214 and an anode assembly 215 is provided through the bracket 2112, and a part of the body of the shell 213 is plugged and matched with the bracket 2112. The corresponding positions of the shell 213 and the cathode filament 2141 are provided in the receiving space. The bracket 2112 has two corresponding sides in the receiving space, the first magnetic member 2111 is fixed on one side, and the second magnetic member 2113 is fixed on the other side, wherein the second magnetic member 2113 and the first magnetic member 2111 have opposite magnetic properties and are located on opposite sides of the cathode filament 2141. The first magnetic member 2111, the second magnetic member 2113 and the bracket 2112 constitute a closed magnetic circuit.

[0096] A magnetic circuit component 211 is provided, and the magnetic field formed by the magnetic circuit component 211 is used to interfere with the electrons generated by the cathode filament 2141, so that the electrons can oscillate in the resonant cavity 2152, thereby generating microwaves.

[0097] It should be understood that the area separated by the first magnetic member 2111 and the second magnetic member 2113 is the middle area, and the cathode filament 2141 and the resonant cavity 2152 and the penetration channel 2151 of the anode assembly 215 are all located in the middle area. The magnetic circuit formed by the first magnetic member 2111, the second magnetic member 2113 and the bracket 2112 has the strongest magnetic field strength in the middle area. The strong magnetic field in the middle area is utilized to disturb the electrons generated by the cathode filament 2141 during operation, so that the electrons can resonate quickly, thereby generating microwaves.

[0098] Furthermore, the bracket 2112 can be an integrated structure or a split structure. When the bracket 2112 is an integrated structure, it can be integrated by stamping or casting, and when the bracket 2112 is a split structure, it can be connected and fixed by welding, riveting, screw connection, etc.

[0099] In some embodiments of the present invention, the first magnetic member 2111 includes a first magnetic collecting member and a first magnet connected to each other, wherein the first magnet is arranged on the inner side of a ring-shaped bracket 2112 and is connected and fixed to the bracket 2112, and the first magnetic collecting member is installed and fixed on the first magnet and arranged facing the second magnetic member 2113.

[0100] Specifically, the first magnetic component 2111 and the second magnetic component 2113 are spaced apart on the bracket 2112, and the shell 213 of the magnetron 21 is penetrated in the space (middle area) between the first magnetic component 2111 and the second magnetic component 2113. By setting the first magnetic concentrator, the magnetic field of the first magnet can be further gathered in the middle area, thereby further improving the magnetic field strength in the middle area, and then when the magnetic circuit assembly 211 is used for the magnetron 21, the output power of the magnetron 21 can be further increased.

[0101] It should be noted that, in the embodiment of the present invention, the first magnet is a rare earth magnetic material, which includes but is not limited to a neodymium iron boron alloy, a samarium cobalt alloy, a platinum cobalt alloy, and an aluminum nickel cobalt alloy, etc. By setting the first magnet to be made of different materials, the magnetic declination of the first magnet can be adjusted, so that the first magnetic member 2111 can meet the use requirements of the magnetron 21.

[0102] Furthermore, the first magnetic field focusing component is a first conical component, and along the direction from the first magnetic field focusing component to the second magnetic field focusing component, the first conical component presents a first tapered structure.

[0103] Specifically, along the direction from the first magnetic concentrator to the second magnetic concentrator, the first conical member presents a first tapered structure, that is, the large end of the first conical member is connected to the first magnetic member 2111, and the small end of the first conical member is arranged close to the second magnetic member 2113. By setting the first magnetic concentrator as the first conical member, the magnetic lines of force can be further converged during the propagation process, so that the magnetic field density in the middle area between the first magnetic member 2111 and the second magnetic member 2113 can be further enhanced, so that when the magnetic circuit assembly 211 is used for the magnetron 21, the output power of the magnetron 21 can be increased.

[0104] It should be noted that the taper a of the first tapered member is 60°≤a≤70°.

[0105] By setting the taper of the first conical member, the magnetic lines of force passing through the first conical member can be gathered at a higher density in the middle area, further improving the magnetic field strength in the middle area, so that the output power of the magnetron 21 is increased without changing the volume, or the purpose of reducing the overall volume while ensuring that the output power remains unchanged is achieved.

[0106] It should be noted that, in the embodiments of the present invention, a can be 60°, 61°, 62°, 63°, 64°, ... 70°.

[0107] In some embodiments of the present invention, the second magnetic member 2113 includes a second magnetic collecting member and a second magnet connected to each other, wherein the second magnet is arranged on the inner side of a ring-shaped bracket 2112 and is connected and fixed to the bracket 2112, and the second magnetic collecting member is installed and fixed on the second magnet and arranged facing the first magnetic member 2111.

[0108] Specifically, the first magnetic component 2111 and the second magnetic component 2113 are spaced apart on the bracket 2112, and the vacuum tube of the magnetron 21 is inserted into the space (middle area) separated by the first magnetic component 2111 and the second magnetic component 2113. By setting the second magnetic concentrator, the magnetic field of the second magnet can be further gathered in the middle area, thereby further improving the magnetic field strength in the middle area, and then when the magnetic circuit assembly 211 is used for the magnetron 21, the output power of the magnetron 21 can be further increased.

[0109] It should be noted that in the embodiment of the present invention, the second magnet is a rare earth magnetic material, which includes but is not limited to a neodymium iron boron alloy, a samarium cobalt alloy, a platinum cobalt alloy, and an aluminum nickel cobalt alloy, etc. By setting the second magnet to be made of different materials, the magnetic declination of the second magnet can be adjusted, so that the second magnetic member 2113 can meet the use requirements of the magnetron 21.

[0110] Furthermore, the second magnetic field focusing member is a second conical member, and along the direction from the second magnetic field focusing member to the first magnetic field focusing member, the second conical member presents a second tapered structure.

[0111] Specifically, along the direction from the second magnetic concentrator to the first magnetic concentrator, the second conical member presents a second tapered structure, that is, the large end of the second conical member is connected to the second magnetic member 2113, and the small end of the second conical member is arranged close to the first magnetic member 2111. By setting the second magnetic concentrator as the second conical member, the magnetic lines of force can be further converged during the propagation process, so that the magnetic field density in the middle area between the first magnetic member 2111 and the second magnetic member 2113 can be further enhanced, so that when the magnetic circuit assembly 211 is used for the magnetron 21, the output power of the magnetron 21 can be increased.

[0112] It should be noted that the taper angle b of the second tapered member is 60°≤b≤70°.

[0113] By setting the taper of the second conical member, the magnetic lines of force passing through the second conical member can be gathered at a higher density in the middle area, further improving the magnetic field strength in the middle area, so that the output power of the magnetron 21 is increased without changing the volume, or the purpose of reducing the overall volume while ensuring that the output power remains unchanged is achieved.

[0114] It should be noted that, in the embodiments of the present invention, b may be 60°, 61°, 62°, 63°, 64°, ... 70°.

[0115] Furthermore, if Figure 2 As shown, the magnetron 21 also includes a heat dissipation component 212, which can be a heat dissipation fin. The heat dissipation component 212 is sleeved on the outer surface of the shell 213 by interference fit to dissipate heat and cool it, and can cooperate with a fan to quickly cool the microwave generating device.

[0116] like Figures 1 to 10 As shown, the present invention also proposes a cooking device 100, which includes a microwave generating assembly 20, and the microwave generating assembly 20 includes a magnetron 21, a waveguide 22, and a stirring member 23. One end of the waveguide 22 is connected to the magnetron 21, and the other end of the waveguide 22 is connected to the cooking cavity 11 of the body 10 of the cooking device 100. The stirring member 23 cooperates with the waveguide 22, and the stirring member 23 stirs the microwaves entering the cooking cavity 11 through the waveguide 22, so as to make the microwaves entering the cooking cavity 11 more uniform.

[0117] Specifically, the cathode filament 2141 of the magnetron 21 is in a spiral structure, and a protrusion 2141b is provided on the spiral body 2141a in the spiral structure, so that the distance between the cathode filament 2141 and the inner wall of the penetration channel 2151 is different, that is, the protrusion position is close to the inner wall of the penetration channel 2151, and the position of the cathode filament 2141 without the protrusion 2141b is farther away from the inner wall of the penetration channel 2151 than the protrusion 2141b. When the cathode filament 2141 is working, the protrusion 2141b is provided, so that the generated electrons are disturbed by the electric field and present an uneven state, and the electrons are very likely to cluster, thereby shortening the start-up time of the magnetron 21.

[0118] In the embodiment shown in the accompanying drawings of the present invention, the above-mentioned cooking utensil is a microwave oven (in other embodiments of the present invention, the cooking utensil is a microwave oven). For the structure of other parts of the microwave oven, please refer to the prior art and will not be described in detail in this application.

[0119] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A magnetron, characterized in that: The magnetron comprises: case; an anode assembly, the anode assembly being disposed in the shell and having a penetration passage; A cathode assembly, wherein the cathode assembly is arranged in the shell, and the cathode assembly includes a cathode filament, wherein the cathode filament is arranged in the penetration channel and spaced apart from the inner wall of the penetration channel, and along the extension direction of the penetration channel, the cathode filament is in a spiral structure, and the spiral structure includes at least two turns of a spiral body, and at least one turn of the spiral body is provided with at least one turn of a raised portion, and the at least one turn of the raised portion protrudes toward the inner wall of the penetration channel.

2. The magnetron according to claim 1, characterized in that: The anode assembly is provided with a resonant cavity, which is located radially outside the spiral structure and is connected to the penetration channel.

3. The magnetron according to claim 2, characterized in that: There are multiple resonant cavities, and all of the resonant cavities are arranged at intervals along the circumference of the spiral structure.

4. The magnetron according to claim 3, characterized in that: There are multiple protrusions on one circle of the spiral body, and the protrusions on one circle of the spiral body correspond to the resonant cavities one by one.

5. The magnetron according to claim 1, characterized in that: Each of the at least two spirals is provided with the protrusion.

6. The magnetron according to claim 5, characterized in that: The numbers of the protrusions in two adjacent turns of the spiral body are the same or different.

7. The magnetron according to claim 1, characterized in that: Along the axial direction of the spiral structure, the raised portions on two adjacent turns of the spiral body are arranged correspondingly; Alternatively, along the axial direction of the spiral structure, the protrusions on two adjacent circles of the spiral body are staggered.

8. The magnetron according to claim 1, characterized in that: The shape of the protrusion is U-shaped, rectangular, arc-shaped or triangular.

9. The magnetron according to claim 1, characterized in that: The magnetron further comprises a magnetic circuit assembly, and the magnetic circuit assembly comprises: A bracket, wherein the bracket has a receiving space, the housing is plugged and matched with the bracket, and the cathode filament is correspondingly arranged in the receiving space; A first magnetic member, which is fixed on the inner side of the bracket and located on one side of the cathode filament; The second magnetic member is fixed on the inner side of the bracket and is located on the other side of the cathode filament. The magnetic direction of the first magnetic member is opposite to that of the second magnetic member. The bracket, the first magnetic member and the second magnetic member form a closed magnetic circuit.

10. A cooking utensil, characterized in that: The cooking appliance comprises the magnetron according to any one of claims 1 to 9.

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