Cooking apparatus
By adjusting the winding position and structure of the microwave oven transformer, the problem of unreasonable filament winding distribution was solved, resulting in a reduction in filament current and temperature, extending the service life of the magnetron, and improving the low-power operation capability of the equipment.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD
- Filing Date
- 2025-10-16
- Publication Date
- 2026-06-04
Smart Images
Figure CN2025128114_04062026_PF_FP_ABST
Abstract
Description
Cooking equipment
[0001] This application claims priority to the following Chinese patent applications filed on November 29, 2024, with application number “202411748897.6” and entitled “Cooking Equipment”; filed on November 29, 2024, with application number “202422950804.X” and entitled “Cooking Equipment”; filed on July 7, 2025, with application number “202510936070.6” and entitled “Cooking Equipment”; and filed on June 3, 2025, with application number “202510735779.X” and entitled “Cooking Equipment”, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of cooking equipment technology, and more specifically, to a cooking device. Background Technology
[0003] Microwave ovens rely on magnetrons to convert electrical energy into microwave energy in order to heat food.
[0004] The inverter power supply output of a microwave oven consists of two parts. One part supplies power to the anode and cathode of the magnetron, with a DC voltage of about 4kV, which generates an electric field inside the magnetron. The other part supplies power to the filament of the magnetron, with a voltage of about 3.3V across the filament, which can continuously emit electrons after being heated by the inverter.
[0005] As shown in Figures 1 and 2, in related technologies, the transformer 120' of a microwave oven includes a filament winding 154', a secondary winding 152', and a primary winding 150', which are arranged from left to right. All three windings are distributed on the same magnetic core. This distribution causes the filament current to decrease significantly at low power, making it impossible for the microwave oven to operate at low power. Furthermore, the filament temperature becomes too high at high power, which accelerates the evaporation of the filament material and affects the lifespan of the magnetron. Summary of the Invention
[0006] This application aims to at least solve the technical problem of unreasonable distribution of the filament winding, secondary winding and primary winding of the transformer in cooking equipment in the prior art or related art.
[0007] In view of this, this application provides a cooking device, including: a magnetron having an anode assembly and a filament; a transformer including a frame, a core assembly, a primary winding, a secondary winding, and a filament winding, wherein the secondary winding is used to power the anode assembly, and the filament winding is used to power the filament; wherein the frame has a first winding portion, a portion of the core assembly is inserted into the first winding portion, the primary winding and the secondary winding are wound on the first winding portion, and the filament winding is wound on the frame and the core assembly, with the filament winding located on one side of the first winding portion.
[0008] The cooking device provided in this application includes a magnetron and a transformer. The magnetron has an anode assembly and a filament. The transformer includes a frame, a core assembly, a primary winding, a secondary winding, and a filament winding. The frame has a first winding section, which is a hollow structure. Part of the core assembly is inserted into the first winding section. The primary and secondary windings are wound on the first winding section. The filament winding is located on one side of the frame and is wound on the core assembly and the frame. That is, the filament winding is not wound on the first winding section, which keeps the filament winding away from the magnetic circuit of the primary and secondary windings. This reduces the magnetic flux of the filament winding, reduces the energy generated by the coupling of the filament winding, and reduces the current of the filament. This, in turn, helps to reduce the temperature of the filament, reduce the evaporation rate of the filament, and improve the service life of the magnetron. This solves the technical problem of the unreasonable distribution of the filament winding, secondary winding, and primary winding of the transformer.
[0009] In some technical solutions, optionally, along the axial direction of the frame, the filament winding is located on the side of the secondary winding away from the primary winding.
[0010] In this technical solution, along the axial direction of the skeleton, the filament winding is located on the side of the secondary winding away from the primary winding, so that the filament winding is far away from the primary winding, thereby further reducing the magnetic flux of the filament winding and reducing the energy coupled to the filament winding.
[0011] In some technical solutions, optionally, the skeleton includes: a main body, which includes a first winding portion, a first end plate, and a second end plate, the first end plate and the second end plate being located at opposite ends of the first winding portion; a cover, which engages with the main body, the cover including a support plate, a third end plate, and a fourth end plate, the third end plate and the fourth end plate being located at opposite ends of the support plate, the third end plate being located on the side of the first end plate away from the second end plate, and the fourth end plate being located on the side of the second end plate away from the first end plate; wherein, the filament winding is wound on the support plate and the magnetic core assembly; or the filament winding is wound on the first end plate, the third end plate, and the magnetic core assembly.
[0012] In this technical solution, the skeleton includes a main body and a cover. The cover is snapped onto the main body, and the split skeleton facilitates the winding of the primary winding and the secondary winding.
[0013] The main body includes a first winding section, a first end plate, and a second end plate. The first end plate and the second end plate are disposed on the first winding section. The first end plate is disposed at one end of the first winding section and extends outward from the circumference of the first winding section. The second end plate is disposed at the other end of the first winding section and extends outward from the circumference of the first winding section. The first winding section, the first end plate, and the second end plate can be an integral structure.
[0014] The cover includes a support plate, a third end plate, and a fourth end plate. The third end plate and the fourth end plate are mounted on the support plate. The third end plate is located at one end of the support plate and extends from the support plate toward the main body, while the fourth end plate is located at the other end of the support plate and extends from the support plate toward the main body. The support plate, the third end plate, and the fourth end plate can be an integral structure.
[0015] The cover snaps onto the main body, and the third and fourth end plates sandwich the first and second end plates in between, thus achieving the fit between the cover and the main body.
[0016] As described above, the support plate and the first winding section are approximately parallel, and there is at least a distance of one first end plate or second end plate between them. The filament winding is wound on the support plate and the core assembly, which ensures that the filament winding is sufficiently far from the primary winding and the secondary winding, reducing the magnetic flux of the filament winding and the energy of filament winding coupling. Alternatively, the first end plate and the third end plate are located on the side of the secondary winding away from the primary winding, and the filament winding is wound on the first end plate, the third end plate, and the core assembly, which ensures that the filament winding is sufficiently far from the primary winding, reducing the magnetic flux of the filament winding and the energy of filament winding coupling.
[0017] In some technical solutions, the main body may optionally include: a first partition plate disposed on the first winding section, with a first winding groove and a second winding groove disposed on the first winding section along the axial direction of the skeleton, the primary winding being located in the first winding groove and the secondary winding being located in the second winding groove, the first partition plate being located on the side of the second winding groove away from the first winding groove; wherein, along the axial direction of the skeleton, the filament winding is located on the side of the first partition plate away from the second winding groove.
[0018] In this technical solution, the main body also includes: a first partition plate disposed on the first winding section. Along the axial direction of the skeleton, the first winding section is provided with a first winding groove and a second winding groove. The primary winding is located in the first winding groove, and the secondary winding is located in the second winding groove. The first partition plate is located on the side of the second winding groove away from the first winding groove. The filament winding is located on the side of the first partition plate away from the second winding groove along the axial direction of the skeleton.
[0019] In this technical solution, the main body also includes a first partition plate disposed on the first winding section. The first winding section has a first winding groove and a second winding groove. The primary winding is disposed in the first winding groove, and the secondary winding is disposed in the second winding groove. Along the axial direction of the skeleton, the secondary winding is located on one side of the primary winding. The first partition plate is located on the side of the second winding groove opposite to the first winding groove. The filament winding is located on the side of the first partition plate opposite to the second winding groove, thereby increasing the insulation between the filament winding, the primary winding, and the secondary winding through the first partition plate.
[0020] In some technical solutions, optionally, a slot is also provided on the first winding part, and along the axial direction of the skeleton, the slot is located between the first winding groove and the second winding groove, and the cover includes a plug-in part that is inserted into the slot.
[0021] In this technical solution, the first winding part is provided with a first winding groove, a second winding groove and a slot. Along the axial direction of the skeleton, the slot is located between the first winding groove and the second winding groove. The cover includes a plug-in part. Along the axial direction of the skeleton, the plug-in part is located between the third end plate and the fourth end plate. The cover is inserted into the slot, thereby improving the stability between the cover and the body.
[0022] In some technical solutions, optionally, the magnetic core assembly includes: a first magnetic core, the first magnetic core including a first arm, a second arm and a third arm, the second arm and the third arm extending in the same direction from the first arm, the third arm being inserted into a first winding portion, and the secondary winding being located outside the third arm; a second magnetic core, a portion of the second magnetic core being inserted into the frame, the second magnetic core and the first magnetic core being opposite each other, and one end of the second magnetic core forming a first air gap with the third arm, and the other end of the second magnetic core forming a second air gap with the second arm; wherein, the filament winding is wound on the frame and the first arm; or the filament winding is wound on the frame and the second arm.
[0023] In this technical solution, the magnetic core assembly includes a first magnetic core and a second magnetic core, which are arranged opposite to each other. The first magnetic core includes a first arm, a second arm, and a third arm. The second arm and the third arm are both disposed on the first arm and extend from the first arm toward the second magnetic core. One end of the third arm and the second magnetic core forms a first air gap, and the other end of the second arm and the second magnetic core forms a second air gap.
[0024] The third arm is inserted inside the frame, with both the primary and secondary windings wound on the outside of the third arm. The filament winding is wound on the frame and the first arm, thus ensuring that the filament winding is away from the magnetic circuits of the primary and secondary windings, reducing the magnetic flux of the filament winding, and reducing the energy coupled to the filament winding. Alternatively, the third arm is inserted inside the frame, with both the primary and secondary windings wound on the outside of the third arm, and the filament winding is wound on the frame and the second arm, thus ensuring that the filament winding is away from the magnetic circuits of the primary and secondary windings, reducing the magnetic flux of the filament winding, and reducing the energy coupled to the filament winding.
[0025] In some technical solutions, optionally, the cross-sectional area of the third arm is greater than that of the first arm; or the cross-sectional area of the third arm is greater than that of the second arm.
[0026] In this technical solution, the cross-sectional area of the third arm is larger than that of the first arm. Since magnetic flux and the effective area of the magnetic field are positively correlated, the cross-sectional areas of the first, second, and third arms can be considered as the effective areas of the magnetic field. Therefore, setting the cross-sectional area of the third arm to be larger than that of the first arm further reduces the magnetic flux of the filament winding, reduces the energy coupled to the filament winding, and reduces the filament current. Alternatively, setting the cross-sectional area of the third arm to be larger than that of the second arm further reduces the magnetic flux of the filament winding, reduces the energy coupled to the filament winding, and reduces the filament current.
[0027] In some technical solutions, the cooking device may optionally include: a thermal relay connected in series between the filament winding and the filament; and / or a resistor connected in series between the filament winding and the filament.
[0028] In this technical solution, the cooking device also includes a thermal relay connected in series between the filament winding and the filament. The thermal relay provides overheat protection for the filament, reduces the evaporation rate of the filament, and extends the lifespan of the magnetron. And / or the cooking device also includes a resistor connected in series between the filament winding and the filament. The resistor shuns the current, thereby reducing the filament current, lowering the filament temperature, reducing the evaporation rate of the filament, and extending the lifespan of the magnetron.
[0029] In some technical solutions, the filament winding may optionally be made of three layers of insulated wire.
[0030] In this technical solution, the filament winding is made of three layers of insulated wire. The three layers of insulation have strong insulation capabilities, which increases the insulation capability between the filament winding and the primary winding, and also increases the insulation capability between the filament winding and the secondary winding.
[0031] In some technical solutions, the cooking equipment may optionally be a microwave oven, a microwave oven, or a microwave steam oven.
[0032] In this technical solution, the cooking equipment can be a microwave oven, a microwave oven, or a microwave steam oven.
[0033] This application provides a cooking device, including: a magnetron having an anode assembly and a filament; a transformer including a hollow frame, a magnetic core assembly, and a primary winding, a secondary winding, and a filament winding wound on the frame, wherein a portion of the magnetic core assembly is inserted into the frame, the secondary winding is used to power the anode assembly, and the filament winding is used to power the filament; wherein the filament winding is located between the primary winding and the secondary winding.
[0034] The cooking equipment provided in this application includes a magnetron and a transformer. The magnetron has an anode assembly and a filament. The transformer includes a frame, a core assembly, a primary winding, a secondary winding, and a filament winding. The frame is hollow, with part of the core assembly inserted inside. The primary winding, secondary winding, and filament winding are wound on the frame, with the filament winding located between the primary and secondary windings. This brings the filament winding closer to the magnetic circuit of the primary winding, thereby increasing the magnetic flux of the filament winding and enhancing the energy generated by the coupling of the filament winding. This ensures that the filament current remains within the rated current range even under low-power conditions, allowing the cooking equipment to use low-power microwave functions such as low-power microwaving to prevent milk from overflowing, low-power microwave defrosting, or low-power microwave fermentation. This expands the applicability of the cooking equipment and solves the technical problem of unreasonable distribution of the filament winding, secondary winding, and primary winding of the transformer.
[0035] In the above technical solution, optionally, along the axial direction of the skeleton, the skeleton is provided with a first winding groove, a second winding groove and a third winding groove, the primary winding is wound in the first winding groove, the filament winding is wound in the third winding groove, and the secondary winding is wound in the second winding groove; wherein, along the axial direction of the skeleton, the size of the third winding groove is smaller than the size of the first winding groove and smaller than the size of the second winding groove.
[0036] In this technical solution, along the axial direction of the skeleton, the skeleton is provided with a first winding groove, a second winding groove and a third winding groove. The primary winding is wound in the first winding groove, thereby protecting the primary winding through the first winding groove and facilitating the winding of the primary winding. The filament winding is wound in the third winding groove, thereby protecting the filament winding through the third winding groove and facilitating the winding of the filament winding. The secondary winding is wound in the second winding groove, thereby protecting the secondary winding through the second winding groove and facilitating the winding of the secondary winding.
[0037] Along the axial direction of the skeleton, the size of the third winding slot is smaller than that of the first winding slot, and the size of the third winding slot is smaller than that of the second winding slot, thereby reducing the distance between the secondary winding and the primary winding, thus ensuring that the magnetic flux of the secondary winding is within a reasonable range, and ensuring the energy coupled to the secondary winding, etc.
[0038] Optionally, in the above technical solution, the frame further includes a second partition and a third partition. The second partition is located between the first winding groove and the third winding groove and is used to separate the first winding groove and the third winding groove. The third partition is located between the third winding groove and the second winding groove and is used to separate the third winding groove and the second winding groove. There is a height difference between the second partition and the third partition.
[0039] In this technical solution, the frame also includes a second partition and a third partition. The second partition separates the first winding slot and the third winding slot. The primary winding and the filament winding are located on both sides of the second partition. The third partition separates the third winding slot and the second winding slot. The filament winding and the secondary winding are located on both sides of the third partition. That is, the second partition and the third partition are the two side walls of the third winding slot. Since the size of the third winding slot is small, the second partition and the third partition are set to have a height difference, which makes it easier for the filament winding to be wound in the third winding slot and reduces the production difficulty.
[0040] In the above technical solution, optionally, the skeleton includes: a main body, with the first winding groove, the third winding groove and the second winding groove located in the main body, and a portion of the magnetic core assembly inserted into the main body; a cover, which is engaged with the main body, the cover including a second end plate, a fourth partition plate and a first end plate, the second end plate and the first end plate being located on both sides of the main body, and the fourth partition plate being inserted into the third winding groove and located on the outside of the filament winding.
[0041] In this technical solution, the frame includes a main body and a cover. The cover is snapped onto the main body. The first winding slot, the third winding slot, and the second winding slot are disposed on the main body. A portion of the magnetic core assembly is inserted into the main body. The cover includes a second end plate, a fourth partition plate, and a first end plate. The second end plate and the first end plate are respectively disposed on both sides of the main body. The fourth partition plate is inserted into the third winding slot and is located outside the filament winding, thereby ensuring the reliability of the connection between the cover and the main body. Furthermore, adding the fourth partition plate can increase the insulation between the primary winding and the secondary winding.
[0042] In the above technical solution, optionally, the side walls of the fourth partition and the third winding groove are attached to each other.
[0043] In this technical solution, the side walls of the fourth partition and the third winding groove are fitted together to ensure the stability of the fit between the cover and the main body.
[0044] In the above technical solution, optionally, the filament winding is a single-turn winding, and the size of the third winding slot along the axis of the skeleton matches the size of the filament winding.
[0045] In this technical solution, the filament winding is a single-turn winding, thereby ensuring that the filament voltage meets the requirements. Along the axis of the skeleton, the size of the third winding slot matches the size of the filament winding, thereby ensuring that the distance between the secondary winding and the primary winding meets the requirements, and ensuring that the energy coupled to the secondary winding can enable the magnetron to operate.
[0046] In the above technical solution, optionally, the filament winding is made of three layers of insulated wire; and / or an insulating layer is provided on the outside of the filament winding.
[0047] In this technical solution, the filament winding is made of three layers of insulated wire. The three layers of insulation have strong insulation capabilities, which increases the insulation capability between the filament winding and the primary winding, and also increases the insulation capability between the filament winding and the secondary winding.
[0048] An insulating layer is provided outside the filament winding to enhance the insulation capacity of the filament winding, increase the insulation capacity between the filament winding and the primary winding, and increase the insulation capacity between the filament winding and the secondary winding.
[0049] Optionally, in the above technical solution, the magnetic core assembly includes: a first magnetic core, a portion of which is inserted into the frame; a second magnetic core, a portion of which is inserted into the frame, the second magnetic core and the first magnetic core being opposite each other, and one end of the first magnetic core and one end of the second magnetic core forming a first air gap, and the other end of the first magnetic core and the other end of the second magnetic core forming a second air gap; wherein, the frame includes a fifth partition and a sixth partition, the fifth partition being inserted into the first air gap, and the sixth partition being inserted into the second air gap.
[0050] In this technical solution, the magnetic core assembly includes a first magnetic core and a second magnetic core. Parts of the first magnetic core and parts of the second magnetic core are inserted into the frame opposite to each other. One end of the first magnetic core and one end of the second magnetic core form a first air gap inside the frame, and the other end of the first magnetic core and the other end of the second magnetic core form a second air gap outside the frame.
[0051] The frame includes a fifth partition and a sixth partition. The fifth partition is inserted into the first air gap, and the sixth partition is inserted into the second air gap to provide positioning for the magnetic core assembly and ensure the reliability of the magnetic core assembly.
[0052] In the above technical solution, optionally, the filament is made of tungsten-thorium alloy.
[0053] In this embodiment, the filament is made of a tungsten-thorium alloy, thereby ensuring the reliability of the filament's electron emission and ensuring the filament's service life.
[0054] In the above technical solution, the cooking equipment can optionally be a microwave oven, a microwave oven, or a microwave steam oven.
[0055] In this technical solution, the cooking equipment can be a microwave oven, a microwave oven, or a microwave steam oven.
[0056] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description
[0057] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0058] Figure 1 shows one of the schematic diagrams of the transformer in the cooking appliance in the relevant technical solution;
[0059] Figure 2 shows a second schematic diagram of the transformer in the cooking appliance in the relevant technical solution;
[0060] Figure 3 shows one of the circuit diagrams of the cooking appliance in the embodiments of this application;
[0061] Figure 4 shows one of the cross-sectional views of the transformer in the cooking appliance in the embodiments of this application;
[0062] Figure 5 shows one of the schematic diagrams of the magnetic core assembly, primary winding, secondary winding, and filament winding in the cooking appliance according to an embodiment of this application;
[0063] Figure 6 shows one of the cross-sectional views of the skeleton in the cooking appliance in the embodiments of this application;
[0064] Figure 7 shows a second cross-sectional view of the transformer in the cooking appliance in an embodiment of this application;
[0065] Figure 8 shows a second schematic diagram of the magnetic core assembly, primary winding, secondary winding, and filament winding in the cooking appliance according to an embodiment of this application;
[0066] Figure 9 shows a second cross-sectional view of the skeleton in the cooking appliance in the embodiments of this application;
[0067] Figure 10 shows a second circuit diagram of the cooking appliance in an embodiment of this application;
[0068] Figure 11 shows a third circuit diagram of the cooking appliance in an embodiment of this application;
[0069] Figure 12 shows a fourth circuit diagram of the cooking device in an embodiment of this application;
[0070] Figure 13 shows a third cross-sectional view of the transformer in the cooking device according to an embodiment of this application;
[0071] Figure 14 shows a third cross-sectional view of the skeleton in the cooking device according to an embodiment of this application;
[0072] Figure 15 shows a cross-sectional view of the frame, filament winding and insulation layer in the cooking device of this application embodiment;
[0073] Figure 16 shows a circuit diagram of some of the electrical components of the cooking apparatus in an embodiment of this application.
[0074] The correspondence between the reference numerals and component names in Figures 1 and 2 is as follows:
[0075] 120' transformer, 150' primary winding, 152' secondary winding, 154' filament winding;
[0076] The correspondence between the reference numerals and component names in Figures 3 to 16 is as follows: 100 Cooking equipment, 110 Magnetron, 112 Anode assembly, 114 Filament, 120 Transformer, 122 Frame, 124 Main body, 126 First winding section, 128 First winding slot, 130 Second winding slot, 132 Slot, 134 First end plate, 136 Second end plate, 138 First partition, 140 Cover, 142 Support plate, 144 Third end plate, 146 Fourth end plate, 148 Plug-in section, 150 Primary winding, 152 Secondary winding, 154 Filament winding, 156 Third... Winding slot, 158 second partition, 160 third partition, 162 fifth partition, 164 fourth partition, 166 sixth partition, 170 magnetic core assembly, 172 first magnetic core, 174 first support arm, 176 second support arm, 178 third support arm, 180 second magnetic core, 182 fourth support arm, 184 fifth support arm, 186 sixth support arm, 188 first air gap, 190 second air gap, 200 thermal relay, 210 resistor, 220 rectifier assembly, 230 power supply assembly, 240 insulation layer. Detailed Implementation
[0077] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, these embodiments and the features described herein can be combined with each other.
[0078] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.
[0079] The cooking apparatus 100 according to some embodiments of the present application is described below with reference to Figures 3 to 16.
[0080] The filament winding 154, secondary winding 152 and primary winding 150 are arranged from left to right. The arrangement of the three windings on the same magnetic core will cause the filament 114 to be under a high current (10A to 12A) when the transformer 120 is working. This will cause the temperature of the filament 114 to be too high, which will accelerate the evaporation of the filament 114 material and affect the service life of the magnetron 110.
[0081] As shown in Figures 3 to 11, this application provides a cooking device 100, which includes a magnetron 110 and a transformer 120. The magnetron 110 includes an anode assembly 112 and a filament 114. The anode assembly 112 may be an anode sleeve. The transformer 120 includes a frame 122, a core assembly 170, and windings wound on the frame 122. The frame 122 has a hollow structure, and a portion of the core assembly 170 is inserted into the hollow portion of the frame 122. A primary winding 150, a secondary winding 152, and a filament winding 154 are wound on the frame 122. The primary winding 150 is used to connect to the power supply component 230. The secondary winding 152 is used to supply power to the anode component 112 of the magnetron 110. The secondary winding 152 can be electrically connected to the anode component 112 through the rectifier component 220. The filament winding 154 supplies power to the filament 114 of the magnetron 110. The filament winding 154 can be directly connected to the filament 114.
[0082] The frame 122 has a first winding portion 126, which is a hollow structure. A portion of the magnetic core assembly 170 is inserted into the hollow position of the first winding portion 126. The primary winding 150 and the secondary winding 152 are wound on the first winding portion 126, that is, the primary winding 150 and the secondary winding 152 are wound on the outside of a portion of the magnetic core assembly 170. The filament winding 154 is located on one side of the first winding portion 126 and is wound on the frame 122 at a position other than the first winding portion 126 and on the magnetic core assembly 170. That is, the filament winding 154 is not wound on the same portion of the magnetic core assembly 170 as the primary winding 150 and the secondary winding 152.
[0083] The cooking device 100 provided in this application includes a magnetron 110 and a transformer 120. The magnetron 110 has an anode assembly 112 and a filament 114. The transformer 120 includes a frame 122, a core assembly 170, a primary winding 150, a secondary winding 152, and a filament winding 154. The frame 122 has a first winding portion 126, which is a hollow structure. A portion of the core assembly 170 is inserted into the first winding portion 126. The primary winding 150 and the secondary winding 152 are wound on the first winding portion 126. The filament winding 154 is located on one side of the frame 122. The filament winding 154 is wound on the magnetic core assembly 170 and the frame 122, that is, it is not wound on the first winding portion 126. This keeps the filament winding 154 away from the magnetic circuit of the primary winding 150 and the secondary winding 152, thereby reducing the magnetic flux of the filament winding 154, reducing the energy generated by the coupling of the filament winding 154, reducing the current of the filament 114, and thus helping to reduce the temperature of the filament 114, reduce the evaporation rate of the filament 114, and improve the service life of the magnetron 110. This solves the technical problem of the unreasonable distribution of the filament winding 154, the secondary winding 152 and the primary winding 150 of the transformer 120.
[0084] This application addresses the issue of excessive temperature rise and consequent quality and lifespan problems caused by the uncontrollable power supply circuit of the magnetron filament in related technologies. It designs a winding scheme for the switching transformer 120 used in microwave oven inverter power supplies. This scheme allows for the regulation of the current in the power supply circuit of the magnetron filament 114 without being limited by the primary-secondary turns ratio of the transformer 120 or without adding additional components or increasing costs. This effectively improves the temperature rise of the anode assembly 112, reduces the volatilization of the filament 114 material, and extends the lifespan of the magnetron filament 114. Simultaneously, it reduces the voltage of the filament winding 154, decreases the power consumption of the filament 114 circuit, and improves the overall system energy efficiency. This scheme is suitable for magnetrons 110 using new environmentally friendly filament materials, such as thorium-free filaments.
[0085] Without increasing cost or size, the voltage and current of the filament 114 of the high-frequency transformer 120 in the microwave oven are reduced by adjusting the magnetic flux of the filament winding 154. This method is suitable for the new environmentally friendly thorium-free magnetron 110.
[0086] As shown in Figures 4 and 7, in some embodiments, the primary winding 150 and the secondary winding 152 are optionally distributed along the axial direction of the frame 122, wherein the filament winding 154 is disposed on the side of the secondary winding 152 opposite to the primary winding 150.
[0087] In this embodiment, along the axial direction of the frame 122, the filament winding 154 is disposed on the side of the secondary winding 152 away from the primary winding 150, so that the filament winding 154 is far away from the primary winding 150, thereby further reducing the magnetic flux of the filament winding 154 and reducing the energy coupled to the filament winding 154.
[0088] As shown in Figures 4, 6, 7 and 8, in some embodiments, the skeleton 122 may optionally include a main body 124 and a cover 140, the cover 140 being engaged with the main body 124.
[0089] The main body 124 includes a first winding portion 126 and a first end plate 134 and a second end plate 136 disposed on the first winding portion 126. The first end plate 134 and the second end plate 136 are arranged along the axial direction of the frame 122. The first end plate 134 is disposed at one end of the first winding portion 126 and the second winding portion is disposed at the other end of the first end plate 134. The first end plate 134 may be annular and the second end plate 136 may also be annular. The primary winding 150 and the secondary winding 152 are located between the first end plate 134 and the second end plate 136.
[0090] The cover 140 includes a support plate 142 and a third end plate 144 and a fourth end plate 146 disposed on the support plate 142. The third end plate 144 and the fourth end plate 146 are arranged along the axial direction of the frame 122. The third end plate 144 is disposed at one end of the support plate 142 and the fourth end plate 146 is disposed at the other end of the support plate 142. The third end plate 144 and the fourth end plate 146 extend toward the first winding portion 126.
[0091] After the cover 140 is fastened onto the main body 124, the third end plate 144 is located on the side of the first end plate 134 away from the second end plate 136, and the fourth end plate 146 is located on the side of the second end plate 136 away from the first end plate 134. The above structure makes the skeleton 122 form a whole, and this structure facilitates the winding of the primary winding 150 and the secondary winding 152.
[0092] In this embodiment, the skeleton 122 includes a main body 124 and a cover 140. The cover 140 is engaged with the main body 124. The split skeleton 122 facilitates the winding of the primary winding 150 and the secondary winding 152.
[0093] The main body 124 includes a first winding portion 126, a first end plate 134, and a second end plate 136. The first end plate 134 and the second end plate 136 are disposed on the first winding portion 126. The first end plate 134 is disposed at one end of the first winding portion 126 and extends outward in the circumferential direction of the first winding portion 126. The second end plate 136 is disposed at the other end of the first winding portion 126 and extends outward in the circumferential direction of the first winding portion 126. The first winding portion 126, the first end plate 134, and the second end plate 136 can be an integral structure.
[0094] The cover 140 includes a support plate 142, a third end plate 144, and a fourth end plate 146. The third end plate 144 and the fourth end plate 146 are disposed on the support plate 142. The third end plate 144 is located at one end of the support plate 142 and extends from the support plate 142 toward the main body 124. The fourth end plate 146 is located at the other end of the support plate 142 and extends from the support plate 142 toward the main body 124. The support plate 142, the third end plate 144, and the fourth end plate 146 can be an integral structure.
[0095] The cover 140 engages with the main body 124, and the third end plate 144 and the fourth end plate 146 sandwich the first end plate 134 and the second end plate 136 in the middle, thereby achieving the cooperation between the cover 140 and the main body 124.
[0096] Among them, the main body 124 can be a rotating structure.
[0097] As shown in Figures 4 and 6, in some embodiments, optionally, the support plate 142 is located on one side of a portion of the structure of the magnetic core assembly 170, and the filament winding 154 is wound on the support plate 142 and the magnetic core assembly 170.
[0098] In this embodiment, the support plate 142 and the first winding portion 126 are substantially parallel, and there is at least a distance of a first end plate 134 or a second end plate 136 between them. The filament winding 154 is wound on the support plate 142 and the magnetic core assembly 170, which can ensure that the filament winding 154 and the primary winding 150 and the secondary winding 152 have a sufficiently large distance, thereby reducing the magnetic flux of the filament winding 154 and reducing the coupling energy of the filament winding 154.
[0099] As shown in Figures 7 and 9, in some embodiments, optionally, the first end plate 134 is located on one side of a portion of the structure of the magnetic core assembly 170, and the filament winding 154 is wound on the first end plate 134, the third end plate 144 and the magnetic core assembly 170.
[0100] In this embodiment, the first end plate 134 and the third end plate 144 are located on the side of the secondary winding 152 away from the primary winding 150. The filament winding 154 is wound on the first end plate 134, the third end plate 144 and the magnetic core assembly 170, which can ensure that the filament winding 154 and the primary winding 150 have a sufficiently large distance, reduce the magnetic flux of the filament winding 154 and reduce the coupling energy of the filament winding 154.
[0101] As shown in Figures 4, 6, 7, and 9, in some embodiments, the main body 124 may optionally include a first partition 138, a first winding groove 128, and a second winding groove 130. The first partition 138 is disposed on the first winding portion 126 and is located between the first end plate 134 and the second end plate 136. The first winding groove 128 and the second winding groove 130 are arranged along the axial direction of the frame 122. The first partition 138 is located on the side of the second winding groove 130 opposite to the first winding groove 128. The primary winding 150 is wound in the first winding groove 128, and the secondary winding 152 is wound in the second winding groove 130. Along the axial direction of the frame 122, the filament winding 154 is located on the side of the first partition 138 opposite to the second winding groove 130.
[0102] In this embodiment, the main body 124 further includes a first partition 138 disposed on the first winding portion 126. The first winding portion 126 has a first winding groove 128 and a second winding groove 130. The primary winding 150 is disposed in the first winding groove 128, and the secondary winding 152 is disposed in the second winding groove 130. Along the axial direction of the frame 122, the secondary winding 152 is located on one side of the primary winding 150. The first partition 138 is located on the side of the second winding groove 130 opposite to the first winding groove 128. The filament winding 154 is located on the side of the first partition 138 opposite to the second winding groove 130, thereby increasing the insulation between the filament winding 154, the primary winding 150, and the secondary winding 152 through the first partition 138.
[0103] As shown in Figures 4, 6, 7 and 9, in some embodiments, the cover 140 may optionally include a plug portion 148 disposed on the support plate 142. The plug portion 148 is located between the third end plate 144 and the fourth end plate 146. The plug portion 148 extends from the support plate 142 toward the first winding portion 126. The first winding portion 126 is also provided with a slot 132. Along the axial direction of the skeleton 122, the slot 132 is located between the first winding groove 128 and the second winding groove 130.
[0104] In this embodiment, the first winding portion 126 is provided with a first winding groove 128, a second winding groove 130, and a slot 132. Along the axial direction of the skeleton 122, the slot 132 is located between the first winding groove 128 and the second winding groove 130. The cover 140 includes a plug-in portion 148. Along the axial direction of the skeleton 122, the plug-in portion 148 is located between the third end plate 144 and the fourth end plate 146. The cover 140 is inserted into the slot 132, thereby improving the stability between the cover 140 and the main body 124.
[0105] As shown in Figures 4, 5, 7, and 8, in some embodiments, the magnetic core assembly 170 optionally includes a first magnetic core 172 and a second magnetic core 180, which are disposed opposite to each other. A portion of the first magnetic core 172 is inserted through one end of the first winding portion 126, and a portion of the second magnetic core 180 is inserted through the other end of the first winding portion 126. One end of the first magnetic core 172 and one end of the second magnetic core 180 form a first air gap 188, and the other end of the first magnetic core 172 and the other end of the second magnetic core 180 form a second air gap 190.
[0106] The first magnetic core 172 includes a first arm 174 and a second arm 176 and a third arm 178 disposed on the first arm 174. The second arm 176 and the third arm 178 extend from the first arm 174 in the same direction. At least a portion of the third arm 178 is inserted into one end of the first winding portion 126. The secondary winding 152 is located outside the third arm 178.
[0107] In this embodiment, the magnetic core assembly 170 includes a first magnetic core 172 and a second magnetic core 180, which are disposed opposite to each other. The first magnetic core 172 includes a first arm 174, a second arm 176, and a third arm 178. The second arm 176 and the third arm 178 are both disposed on the first arm 174. The second arm 176 and the third arm 178 extend from the first arm 174 toward the second magnetic core 180. One end of the third arm 178 and the second magnetic core 180 forms a first air gap 188, and the other end of the second arm 176 and the second magnetic core 180 forms a second air gap 190.
[0108] As shown in Figures 4 and 5, in some embodiments, optionally, the filament winding 154 is wound around the frame 122 and the first arm 174.
[0109] In this embodiment, the third arm 178 is inserted into the frame 122, and the primary winding 150 and the secondary winding 152 are both wound around the outside of the third arm 178. The filament winding 154 is wound around the frame 122 and the first arm 174, thereby ensuring that the filament winding 154 is far away from the magnetic circuit of the primary winding 150 and the secondary winding 152, reducing the magnetic flux of the filament winding 154, and reducing the energy coupled to the filament winding 154.
[0110] As shown in Figures 7 and 8, in some embodiments, optionally, the filament winding 154 is wound around the frame 122 and the second arm 176.
[0111] In this embodiment, the third arm 178 is inserted into the frame 122, and the primary winding 150 and the secondary winding 152 are both wound around the outside of the third arm 178. The filament winding 154 is wound around the frame 122 and the second arm 176, thereby ensuring that the filament winding 154 is far away from the magnetic circuit of the primary winding 150 and the secondary winding 152, reducing the magnetic flux of the filament winding 154, and reducing the energy coupled to the filament winding 154.
[0112] As shown in Figures 5 and 8, in some embodiments, optionally, the second magnetic core 180 includes a fourth arm 182, a fifth arm 184, and a sixth arm 186. The fifth arm 184 and the sixth arm 186 extend from the fourth arm 182 in the same direction. The sixth arm 186 is inserted into the first winding portion 126. The primary winding 150 is located outside the third arm 178 and the sixth arm 186. That is, the first magnetic core 172 and the second air gap 190 are arranged corresponding to the primary winding 150.
[0113] A second air gap 190 is formed between the second arm 176 and the fifth arm 184, and a first air gap 188 is formed between the third arm 178 and the sixth arm 186.
[0114] As shown in Figures 7 and 8, in some embodiments, optionally, the filament winding 154 is wound on the first arm 174 and the frame 122, and the cross-sectional area of the third arm 178 is larger than the cross-sectional area of the first arm 174.
[0115] In this embodiment, the cross-sectional area of the third arm 178 is greater than that of the first arm 174. Since the magnetic flux and the effective area of the magnetic field are positively correlated, the cross-sectional areas of the first arm 174, the second arm 176, and the third arm 178 can be regarded as the effective area of the magnetic field. Therefore, by setting the cross-sectional area of the third arm 178 to be greater than that of the first arm 174, the magnetic flux of the filament winding 154 is further reduced, the energy coupled to the filament winding 154 is reduced, and the current of the filament 114 is reduced.
[0116] The filament winding 154 is wound on the first arm 174 and the support plate 142.
[0117] As shown in Figures 5 and 6, in some embodiments, optionally, the filament winding 154 is wound on the second arm 176 and the frame 122, and the cross-sectional area of the third arm 178 is larger than the cross-sectional area of the second arm 176.
[0118] In this embodiment, the cross-sectional area of the third arm 178 is set to be greater than that of the second arm 176, which further reduces the magnetic flux of the filament winding 154, reduces the energy coupled to the filament winding 154, and reduces the current of the filament 114.
[0119] The filament winding 154 is wound on the first end plate 134, the third end plate 144, and the second arm 176.
[0120] As shown in Figure 10, in some embodiments, the cooking device 100 may optionally include a thermal relay 200 connected in series between the filament winding 154 and the filament 114.
[0121] In this embodiment, the cooking device 100 also includes a thermal relay 200 connected in series between the filament winding 154 and the filament 114. The thermal relay 200 provides overheat protection for the filament 114, reduces the evaporation rate of the filament 114, and extends the service life of the magnetron 110.
[0122] Among them, the thermal relay 200 is a protective electrical device used for overload protection of motors or other electrical equipment and electrical circuits.
[0123] The thermal relay 200 can disconnect the connection between the filament winding 154 and the cathode of the magnetron 110 when the temperature of the environment where the magnetron 110 is located rises to the operating temperature of the thermal relay 200. When the power supply is cut off, the temperature of the filament 114 will decrease. Obviously, in this process, the temperature of the filament 114 of the magnetron 110 can be prevented from rising too high and affecting its service life.
[0124] As shown in Figure 11, in some embodiments, the cooking device 100 may optionally include a resistor 210 connected in series between the filament winding 154 and the filament 114.
[0125] In this embodiment, the cooking device 100 also includes a resistor 210 connected in series between the filament winding 154 and the filament 114. The resistor 210 shunts the current in the filament 114, thereby reducing the temperature of the filament 114, reducing the evaporation rate of the filament 114, and improving the service life of the magnetron 110.
[0126] Among them, resistor 210 can be a thermistor, so as to realize the self-feedback regulation of the circuit current of filament 114 of magnetron 110 and the temperature rise of magnetron 110, so as to prevent the filament 114 of magnetron 110 from overheating under continuous power supply, and the volatilization of filament 114 material from affecting the service life of magnetron 110. At the same time, it can also improve the efficiency of magnetron 110.
[0127] After the magnetron 110 is started and the filament 114 is fully preheated, the resistance of the thermistor increases, and the current in the filament 114 circuit decreases, approaching 0. At this time, the temperature of the filament 114 of the magnetron 110 will be controlled to prevent the filament 114 of the magnetron 110 from overheating under continuous power supply, which would cause the filament 114 material to volatilize and affect the service life of the magnetron 110. At the same time, it can also improve the efficiency of the magnetron 110.
[0128] In some embodiments, the filament winding 154 is optionally wound with three layers of insulated wire.
[0129] In this embodiment, the filament winding 154 is wound with three layers of insulated wire. The three layers of insulation have strong insulation capabilities, which increases the insulation capability between the filament winding 154 and the primary winding 150, and also increases the insulation capability between the filament winding 154 and the secondary winding 152.
[0130] In some embodiments, the cooking appliance 100 may optionally be a microwave oven, a microwave oven, or a microwave steam oven.
[0131] In this embodiment, the cooking device 100 may be a microwave oven, a microwave oven, or a microwave steam oven.
[0132] As shown in Figures 10 and 11, in some embodiments, the cooking device 100 may optionally include a power supply component 230, wherein a first output terminal of the power supply component 230 is connected to a first end of the primary winding 150, and a second output terminal of the power supply component 230 is connected to a second end of the primary winding 150, for providing alternating current to the primary winding 150.
[0133] In this embodiment, a power supply component 230 is provided to supply alternating current to the primary winding 150, and then the transformer 120 is used to supply power to the magnetron 110 to drive the magnetron 110 to output microwaves, thereby realizing the cooking of food.
[0134] For example, the power supply component 230 is an AC power supply or an inverter circuit.
[0135] In some embodiments, the secondary winding 152 is optionally connected to the anode assembly 112 of the magnetron 110 via the rectifier assembly 220.
[0136] As shown in Figures 3 to 11, in some embodiments, optionally, the cooking appliance provided in this application includes a transformer 120. The transformer 120 mainly consists of a primary winding 150, a secondary winding 152, a first magnetic core 172, a second magnetic core 180, a filament winding 154, a first air gap 188, a second air gap 190, and a frame 122. The filament winding 154 is wound on the outer post of the U-shaped first magnetic core 172, that is, the part of the first magnetic core 172 that is not inserted into the frame 122. Furthermore, the number of turns of the filament winding 154 is ≥1T, and the filament winding 154 is wound with triple-layer insulated wire to increase the insulation withstand voltage capability of the filament winding 154 and improve the reliability of the transformer 120. The induced electromotive force generated by the electromagnetic change of the filament winding 154 of the transformer 120 is related not only to the turns ratio but also to the change in magnetic flux. When the filament winding 154 has only one turn, the voltage cannot be adjusted by reducing the number of turns. Instead, the voltage of the filament 114 can be reduced by adjusting the winding position of the filament winding 154, moving it away from the magnetic circuit of the primary winding 150 and the secondary winding 152. This reduces the change in magnetic flux within the filament winding 154, thereby reducing the current in the filament 114 and lowering its temperature rise. Furthermore, the magnetic flux can be changed by adjusting the thickness of the outer side of the magnetic core assembly 170, thus achieving voltage adjustment.
[0137] This application reduces the voltage of the filament 114 of the magnetron 110 from 3.3V to 1.6V and the current of the filament 114 from 10A to 6A without increasing size or cost by changing the position of the filament winding 154 of the transformer 120. The cooking device 100 provided by this application can prevent the filament 114 of the magnetron 110 from overheating under continuous power, thus preventing the filament material from volatilizing and affecting the lifespan of the magnetron 110, while also improving the efficiency of the magnetron 110.
[0138] Yes, a thermal relay 200 can be connected in series in the power supply circuit of the transformer 120 to the filament 114. As the ambient temperature of the magnetron 110 starts to rise, the power supply circuit of the filament 114 is disconnected, thereby preventing the filament 114 of the magnetron 110 from overheating and affecting its service life.
[0139] Optionally, a high-voltage, high-power resistor can be connected in series in the power supply circuit of the transformer 120 to the filament 114. The power supply voltage of the filament 114 of the magnetron 110 can be reduced by voltage division of the resistor, thereby preventing the filament 114 of the magnetron 110 from overheating and affecting its service life.
[0140] The filament winding 154, secondary winding 152, and primary winding 150 are arranged from left to right. This arrangement, with all three windings distributed on the same magnetic core, results in the filament winding 154 being far from the magnetic circuits of the primary winding 150 and secondary winding 152. Furthermore, the voltage of the filament 114 varies with the input power. The lower the input power, the lower the supply voltage of the filament 114 to the magnetron 110, and the lower the current of the filament 114. For example, when the input power is as low as 150W to 300W, the current of the filament 114 will be lower than the rated current of the magnetron 110's filament 114 (8A to 12A), causing abnormal operation of the magnetron 110. Additionally, under hot conditions, the resistance of the filament 114 increases, further reducing the current. Consequently, the microwave oven cannot operate at low power, failing to achieve functions such as low-power microwaving of milk without overflow, low-power microwave defrosting, or low-power microwave fermentation.
[0141] As shown in Figures 12 to 16, this application provides a cooking device 100, which includes a magnetron 110 and a transformer 120. The magnetron 110 includes an anode assembly 112 and a filament 114. The anode assembly 112 may be an anode sleeve. The transformer 120 includes a frame 122, a core assembly 170, and windings wound on the frame 122. The frame 122 has a hollow structure, and a portion of the core assembly 170 is inserted into the hollow portion of the frame 122. A primary winding 150, a secondary winding 152, and a filament 114 winding are wound on the frame 122. The primary winding 150 is used to connect to the power supply component 230. The secondary winding 152 is used to supply power to the anode component 112 of the magnetron 110. The secondary winding 152 can be electrically connected to the anode component 112 through the rectifier component 220. The filament 114 winding supplies power to the filament 114 of the magnetron 110. The filament 114 winding can be directly connected to the filament 114.
[0142] This application provides a cooking device 100, including a magnetron 110 and a transformer 120. The magnetron 110 has an anode assembly 112 and a filament 114. The transformer 120 includes a frame 122, a core assembly 170, a primary winding 150, a secondary winding 152, and a filament 114 winding. The frame 122 is hollow, and part of the core assembly 170 is inserted into the frame 122. The primary winding 150, the secondary winding 152, and the filament 114 winding are wound on the frame 122, with the filament 114 winding located on the primary winding. Between the primary winding 150 and the secondary winding 152, the filament 114 winding is brought closer to the magnetic circuit of the primary winding 150, thereby increasing the magnetic flux of the filament 114 winding and enhancing the energy generated by the coupling of the filament 114 winding. This ensures that the current of the filament 114 remains within the rated current range under low-power conditions, allowing the cooking equipment 100 to use low-power microwave functions such as low-power hot milk boiling without overflowing, low-power microwave defrosting, or low-power microwave fermentation, thus expanding the applicability of the cooking equipment 100.
[0143] This application solves the technical problem of insufficient current in filament 114 due to low coupling energy under low input power. The cooking device 100 provided by this application includes a magnetron 110 and a transformer 120. The transformer 120 supplies power to the magnetron 110. It can adjust the current of the power supply circuit of filament 114 of magnetron 110 without being limited by the primary and secondary turns ratio of transformer 120 or without adding additional components and costs. This ensures that the current of filament 114 of magnetron 110 is always between 8A and 12A within the continuous input power range (150W to 1500W), thereby increasing the working power of cooking device 100 and enabling it to work under low power (150W to 300W).
[0144] The frame 122 is made of insulating material.
[0145] As shown in Figures 13, 14, and 15, in the above embodiment, optionally, the frame 122 is provided with a first winding groove 128, a second winding groove 130, and a third winding groove 156. The first winding groove 128, the third winding groove 156, and the second winding groove 130 are distributed along the axial direction of the frame 122. The primary winding 150 is wound in the first winding groove 128, the filament 114 winding is wound in the third winding groove 156, and the secondary winding 152 is wound in the second winding groove 130. Specifically, the first winding groove 128, the third winding groove 156, and the second winding groove 130 are arranged around the hollow portion of the frame 122, thereby allowing the primary winding 150, the secondary winding 152, and the filament 114 winding to be wound on a portion of the structure of the magnetic core assembly 170, thereby increasing the magnetic flux of the primary winding 150, the secondary winding 152, and the filament 114 winding.
[0146] Furthermore, along the axial direction of the skeleton 122, the size of the third winding groove 156 is smaller than the size of the first winding groove 128 and smaller than the size of the second winding groove 130.
[0147] In this embodiment, along the axial direction of the frame 122, the frame 122 is provided with a first winding groove 128, a third winding groove 156, and a second winding groove 130. The primary winding 150 is wound in the first winding groove 128, thereby protecting the primary winding 150 through the first winding groove 128 and facilitating the winding of the primary winding 150. The filament 114 winding is wound in the third winding groove 156, thereby protecting the filament 114 winding through the third winding groove 156 and facilitating the winding of the filament 114 winding. The secondary winding 152 is wound in the second winding groove 130, thereby protecting the secondary winding 152 through the second winding groove 130 and facilitating the winding of the secondary winding 152.
[0148] Along the axial direction of the skeleton 122, the size of the third winding slot 156 is smaller than that of the first winding slot 128, and the size of the third winding slot 156 is smaller than that of the second winding slot 130, thereby reducing the distance between the secondary winding 152 and the primary winding 150, thus ensuring that the magnetic flux of the secondary winding 152 is within a reasonable range, and ensuring the energy coupled to the secondary winding 152.
[0149] As shown in Figures 13, 14, and 15, in the above embodiments, optionally, the frame 122 further includes a second partition 158 and a third partition 160. The second partition 158 extends in a direction perpendicular to the axial direction of the frame 122, and the second partition 158 separates a first winding groove 128 and a third winding groove 156 on the frame 122. The third partition 160 separates a third winding groove 156 and a second winding groove 130 on the frame 122. Furthermore, the second partition 158 protrudes from the third partition 160, or the third partition 160 protrudes from the second partition 158, that is, there is a height difference D between the second partition 158 and the third partition 160.
[0150] In this embodiment, the frame 122 further includes a second partition 158 and a third partition 160. The second partition 158 separates the first winding slot 128 and the third winding slot 156. The primary winding 150 and the filament 114 winding are located on both sides of the second partition 158, respectively. The third partition 160 separates the third winding slot 156 and the second winding slot 130, respectively. The filament 114 winding and the secondary winding 152 are located on both sides of the third partition 160. That is, the second partition 158 and the third partition 160 are the two side walls of the third winding slot 156. Since the size of the third winding slot 156 is small, the second partition 158 and the third partition 160 are set to have a height difference D, which makes it easier for the filament 114 winding to be wound in the third winding slot 156 and reduces the production difficulty.
[0151] As shown in Figures 13, 14, and 15, in the above embodiments, optionally, the skeleton 122 includes a main body 124 and a cover 140. The cover 140 is engaged with the main body 124. The main body 124 has a hollow structure, and part of the magnetic core assembly 170 is inserted into the main body 124. The main body 124 includes a second partition 158 and a third partition 160, which are distributed around the axial direction of the skeleton 122. The second partition 158 separates a first winding groove 128 and a third winding groove 156 on the main body 124, and the third partition 160 separates a third winding groove 156 and a second winding groove 130 on the main body 124.
[0152] The cover 140 includes a second end plate 136, a fourth partition 164, and a first end plate 134. The second end plate 136 and the first end plate 134 are located on both sides of the main body 124. That is, the second end plate 136 and the first end plate 134 will not extend into the first winding groove 128 or the second winding groove 130, so as to avoid the influence of the cover 140 on the winding. The fourth partition 164 is inserted into the third winding groove 156, thereby increasing the reliability of the connection between the main body 124 and the cover 140. Furthermore, the fourth partition 164 is located outside the filament 114 winding, so as to avoid the influence of the fourth partition 164 on the filament 114 winding.
[0153] In this embodiment, the frame 122 includes a main body 124 and a cover 140. The cover 140 is snapped onto the main body 124. The first winding groove 128, the third winding groove 156, and the second winding groove 130 are disposed on the main body 124. A portion of the magnetic core assembly 170 is inserted into the main body 124. The cover 140 includes a second end plate 136, a fourth partition plate 164, and a first end plate 134. The second end plate 136 and the first end plate 134 are respectively disposed on both sides of the main body 124. The fourth partition plate 164 is inserted into the third winding groove 156 and is located outside the filament 114 winding, thereby ensuring the reliability of the connection between the cover 140 and the main body 124. Furthermore, adding the fourth partition plate 164 can increase the insulation between the primary winding 150 and the secondary winding 152.
[0154] As shown in Figures 13, 14 and 15, in the above embodiments, optionally, along the axial direction of the skeleton 122, one side of the fourth partition 164 is attached to the second partition 158, and the other side of the partition is attached to the third partition 160.
[0155] In this embodiment, the side walls of the fourth partition 164 and the third winding groove 156 are fitted together to ensure the stability of the fit between the cover 140 and the main body 124.
[0156] In the above embodiments, optionally, the filament 114 winding adopts a single-turn winding, and along the axial direction of the skeleton 122, the size of the third winding slot 156 matches the size of the filament 114 winding.
[0157] In this embodiment, the filament 114 winding is a single-turn winding, thereby ensuring that the voltage of the filament 114 meets the requirements. Along the axial direction of the frame 122, the size of the third winding slot 156 matches the size of the filament 114 winding, thereby ensuring that the distance between the secondary winding 152 and the primary winding 150 meets the requirements, and ensuring that the energy coupled to the secondary winding 152 can enable the magnetron 110 to operate.
[0158] As shown in Figure 13, in the above embodiment, optionally, the filament 114 winding is wound with three layers of insulated wire.
[0159] In this embodiment, the filament 114 winding is made of three layers of insulated wire. The three layers of insulation have strong insulation capabilities, which increases the insulation capability between the filament 114 winding and the primary winding 150, and also increases the insulation capability between the filament 114 winding and the secondary winding 152.
[0160] As shown in Figure 15, in the above embodiment, optionally, an insulating layer 240 is provided outside the filament 114 winding.
[0161] In this embodiment, an insulating layer 240 is provided outside the filament 114 winding, which enhances the insulation capability of the filament 114 winding, increases the insulation capability between the filament 114 winding and the primary winding 150, and increases the insulation capability between the filament 114 winding and the secondary winding 152.
[0162] The insulating layer 240 can be directly wrapped around the filament 114 winding, or the insulating layer 240 can be injected into the third winding groove 156, thereby forming the insulating layer 240 on the outside of the filament 114 winding.
[0163] In the above embodiments, optionally, the filament 114 winding is made of three layers of insulated wire, and an insulating layer 240 is provided outside the filament 114 winding.
[0164] In this embodiment, the filament 114 winding is made of three layers of insulated wire, which has strong insulation capability. An insulation layer 240 is provided outside the filament 114 winding to increase the insulation capability between the filament 114 winding and the primary winding 150, and to increase the insulation capability between the filament 114 winding and the secondary winding 152.
[0165] As shown in Figure 13, in the above embodiment, optionally, the magnetic core assembly 170 includes a first magnetic core 172 and a second magnetic core 180, the first magnetic core 172 and the second magnetic core 180 are disposed opposite to each other, a portion of the first magnetic core 172 is inserted into the frame 122, a portion of the second magnetic core 180 is inserted into the frame 122, and one end of the first magnetic core 172 and one end of the second magnetic core 180 form a first air gap 188, and the other end of the first magnetic core 172 and the other end of the second magnetic core 180 form a second air gap 190; wherein, the frame 122 includes a fifth partition 162 and a sixth partition 166, the fifth partition 162 is inserted into the first air gap 188, and the sixth partition 166 is inserted into the second air gap 190.
[0166] In this embodiment, the magnetic core assembly 170 includes a first magnetic core 172 and a second magnetic core 180. A portion of the first magnetic core 172 and a portion of the second magnetic core 180 are inserted into the frame 122 opposite to each other. One end of the first magnetic core 172 and one end of the second magnetic core 180 form a first air gap 188 within the frame 122, and the other end of the first magnetic core 172 and the other end of the second magnetic core 180 form a second air gap 190 outside the frame 122.
[0167] The frame 122 includes a fifth partition 162 and a sixth partition 166. The fifth partition 162 is inserted into the first air gap 188 and the sixth partition 166 is inserted into the second air gap 190 to provide positioning for the magnetic core assembly 170 and ensure the reliability of the magnetic core assembly 170.
[0168] Specifically, the first magnetic core 172 includes a first arm, a second arm, and a third arm. The second arm and the third arm extend in the same direction as the first arm. The third arm is inserted into the frame 122. The second magnetic core 180 includes a fourth arm, a fifth arm, and a sixth arm. The fifth arm and the sixth arm extend in the same direction as the fourth arm. The sixth arm is inserted into the frame 122. A first air gap 188 is formed between the third arm and the sixth arm, and a second air gap 190 is formed between the second arm and the fifth arm.
[0169] The main body 124 includes a fifth partition 162, which is located inside the hollow portion of the main body 124 and is disposed on the back side of the second partition 158 and the third partition 160. The cover 140 includes a sixth partition 166, which is located on the back side of the fourth partition 164, the second end plate 136 and the first end plate 134. The fifth partition 162 is inserted into the first air gap 188 and the sixth partition 166 is inserted into the second air gap 190.
[0170] In the above embodiments, the filament 114 is optionally made of a tungsten-thorium alloy.
[0171] In this embodiment, the filament 114 is made of tungsten-thorium alloy, thereby ensuring the reliability of the filament 114 in emitting electrons and ensuring the service life of the filament 114.
[0172] In the above embodiments, the cooking device 100 may optionally be a microwave oven, a microwave oven, or a microwave steam oven.
[0173] In this embodiment, the cooking device 100 may be a microwave oven, a microwave oven, or a microwave steam oven.
[0174] As shown in Figures 12 to 16, the transformer 120 of the cooking device 100 provided in this application includes a primary winding 150, a secondary winding 152, a magnetic core assembly 170, a filament 114 winding, and a frame 122. The magnetic core assembly 170 includes a first magnetic core 172 and a second magnetic core 180, and a first air gap 188 and a second air gap 190 are formed between the first magnetic core 172 and the second magnetic core 180. The frame 122 includes a first winding slot 128, a third winding slot 156, and a second winding slot 130. The primary winding 150 is wound in the first winding slot 128, the secondary winding 152 is wound in the second winding slot 130, and the filament 114 is wound in the third winding slot 156. The third winding slot 156 is located between the first winding slot 128 and the second winding slot 130. The filament 114 winding is made of triple-insulated wire. The triple-insulated wire has strong insulation ability, which increases the insulation ability between the filament 114 winding and the primary winding 150, as well as between the filament 114 winding and the secondary winding 152. By placing the third winding slot 156, where the filament 114 winding is located, between the primary winding 150 and the secondary winding 152, the coupling capability of the filament 114 winding can be increased, ensuring that the current of the filament 114 of the magnetron 110 is in the range of 8A to 12A under extremely low input power and high input power.
[0175] In other words, the cooking equipment 100 provided in this application uses a high-voltage transformer 120 (switching transformer 120). By designing the winding structure of the filament 114 winding of the transformer 120 and the coupling capability of the transformer 120, that is, by adjusting the magnetic flux of the filament 114 winding, the voltage of the filament 114 winding is regulated, ensuring that the current of the filament 114 of the magnetron 110 is within its rated specification range in the full input power range, thus significantly reducing the minimum continuous input power of the inverter microwave oven.
[0176] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.
[0177] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0178] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A cooking appliance, wherein, include: A magnetron having an anode assembly and a filament; A transformer, comprising a frame, a magnetic core assembly, a primary winding, a secondary winding, and a filament winding, wherein the secondary winding supplies power to the anode assembly and the filament winding supplies power to the filament; The frame has a first winding section, a portion of the magnetic core assembly is inserted into the first winding section, the primary winding and the secondary winding are wound on the first winding section, the filament winding is wound on the frame and the magnetic core assembly, and the filament winding is located on one side of the first winding section.
2. The cooking apparatus according to claim 1, wherein, Along the axial direction of the skeleton, the filament winding is located on the side of the secondary winding opposite to the primary winding.
3. The cooking apparatus according to claim 2, wherein, The skeleton includes: The main body includes a first winding portion, a first end plate, and a second end plate, wherein the first end plate and the second end plate are respectively located at both ends of the first winding portion; A cover is engaged with the main body. The cover includes a support plate, a third end plate, and a fourth end plate. The third end plate and the fourth end plate are respectively located at both ends of the support plate. The third end plate is located on the side of the first end plate away from the second end plate, and the fourth end plate is located on the side of the second end plate away from the first end plate. The filament winding is wound around the support plate and the magnetic core assembly; or the filament winding is wound around the first end plate, the third end plate and the magnetic core assembly.
4. The cooking apparatus according to claim 3, wherein, The subject also includes: A first partition is disposed on the first winding section. Along the axial direction of the skeleton, the first winding section is provided with a first winding groove and a second winding groove. The primary winding is located in the first winding groove, and the secondary winding is located in the second winding groove. The first partition is located on the side of the second winding groove opposite to the first winding groove. Along the axial direction of the skeleton, the filament winding is located on the side of the first partition away from the second winding groove.
5. The cooking apparatus according to claim 4, wherein, The first winding portion is also provided with a slot, which is located between the first winding groove and the second winding groove along the axial direction of the skeleton. The cover includes a plug-in portion that is inserted into the slot.
6. The cooking apparatus according to any one of claims 1 to 5, wherein, The magnetic core assembly includes: The first magnetic core includes a first arm, a second arm, and a third arm. The second arm and the third arm extend from the first arm in the same direction. The third arm is inserted into the first winding portion, and the secondary winding is located outside the third arm. The second magnetic core is partially inserted into the skeleton. The second magnetic core is opposite to the first magnetic core, and one end of the second magnetic core forms a first air gap with the third support arm, and the other end of the second magnetic core forms a second air gap with the second support arm. The filament winding is wound around the frame and the first support arm; or the filament winding is wound around the frame and the second support arm.
7. The cooking apparatus according to claim 6, wherein, The cross-sectional area of the third arm is greater than the cross-sectional area of the first arm; or The cross-sectional area of the third arm is greater than that of the second arm.
8. The cooking apparatus according to any one of claims 1 to 5, wherein, Also includes: A thermal relay is connected in series between the filament winding and the filament. and / or A resistor is connected in series between the filament winding and the filament.
9. The cooking apparatus according to any one of claims 1 to 5, wherein, The filament winding is made of three layers of insulated wire.
10. The cooking apparatus according to any one of claims 1 to 5, wherein, The cooking equipment is a microwave oven, microwave oven, or microwave steam oven.
11. A cooking apparatus, wherein, include: A magnetron having an anode assembly and a filament; A transformer, comprising a hollow frame, a magnetic core assembly, and a primary winding, a secondary winding, and a filament winding wound on the frame, wherein a portion of the magnetic core assembly is inserted into the frame, the secondary winding is used to supply power to the anode assembly, and the filament winding is used to supply power to the filament. The filament winding is located between the primary winding and the secondary winding.
12. The cooking apparatus according to claim 11, wherein, Along the axial direction of the skeleton, the skeleton is provided with a first winding groove, a second winding groove and a third winding groove. The primary winding is wound in the first winding groove, the filament winding is wound in the third winding groove, and the secondary winding is wound in the second winding groove. Along the axial direction of the skeleton, the size of the third winding groove is smaller than the size of the first winding groove and smaller than the size of the second winding groove.
13. The cooking apparatus according to claim 12, wherein, The frame further includes a second partition and a third partition. The second partition is located between the first winding groove and the third winding groove to separate the first winding groove and the third winding groove. The third partition is located between the third winding groove and the second winding groove to separate the third winding groove and the second winding groove. There is a height difference between the second partition and the third partition.
14. The cooking apparatus according to claim 12, wherein, The skeleton includes: The main body, the first winding groove, the third winding groove and the second winding groove are located in the main body, and a portion of the magnetic core assembly is inserted into the main body; The cover is engaged with the main body. The cover includes a second end plate, a fourth partition plate and a first end plate. The second end plate and the first end plate are located on both sides of the main body. The fourth partition plate is inserted into the third winding groove and is located on the outside of the filament winding.
15. The cooking apparatus according to claim 14, wherein, The fourth partition and the two side walls of the third winding groove are attached to each other.
16. The cooking apparatus according to claim 12, wherein, The filament winding is a single-turn winding, and the size of the third winding slot matches the size of the filament winding along the axial direction of the skeleton.
17. The cooking apparatus according to any one of claims 11 to 16, wherein, The filament winding is made of three layers of insulated wire; and / or An insulating layer is provided on the outside of the filament winding.
18. The cooking apparatus according to any one of claims 11 to 16, wherein, The magnetic core assembly includes: A first magnetic core, a portion of which is inserted into the skeleton; A second magnetic core is inserted into the skeleton. The second magnetic core is opposite to the first magnetic core, and one end of the first magnetic core and one end of the second magnetic core form a first air gap, and the other end of the first magnetic core and the other end of the second magnetic core form a second air gap. The frame includes a fifth partition and a sixth partition, the fifth partition being inserted into the first air gap and the sixth partition being inserted into the second air gap.
19. The cooking apparatus according to any one of claims 11 to 16, wherein, The filament is made of a tungsten-thorium alloy.
20. The cooking apparatus according to any one of claims 11 to 16, wherein, The cooking equipment is a microwave oven, microwave oven, or microwave steam oven.