CN108630415B

CN108630415B - Transformer and microwave cooking appliance

Info

Publication number: CN108630415B
Application number: CN201810388066.0A
Authority: CN
Inventors: 増田愼一
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2018-04-26
Filing date: 2018-04-26
Publication date: 2024-07-16
Anticipated expiration: 2038-04-26
Also published as: CN108630415A

Abstract

The invention discloses a transformer and a microwave cooking appliance. The transformer includes an insulated bobbin and two magnetic cores. Two cores are inserted in the bobbin. The bobbin inner wall of the bobbin is provided with a first spacer, the first spacer comprises a first spacer block and a second spacer block connected with the first spacer block, and the thickness of the second spacer block is different from that of the first spacer block. One end of each of the two magnetic cores is separated by a first spacer or a second spacer. In the transformer, as the first spacing blocks and the second spacing blocks with different thickness are arranged in the winding tube, and the two magnetic cores can be abutted against the first spacing blocks or the second spacing blocks according to actual requirements so as to adjust the size of the interval between the two magnetic cores, the transformer can meet the requirements of different specifications or models, the cost of the transformer is low, and the production efficiency is high.

Description

Transformer and microwave cooking appliance

Technical Field

The invention relates to the technical field of household appliances, in particular to a transformer and a microwave cooking appliance.

Background

In the related art, a transformer generally includes various windings, a magnetic core, and the like. Referring to fig. 10, two opposite magnetic cores (not shown) are separated from each other by a spacer 302 disposed on an inner wall of an insulating bobbin 301 of the bobbin 300 to maintain a fixed gap between the two magnetic cores, but a mold for manufacturing a transformer is only suitable for a transformer of one specification and cannot be commonly used, which results in high cost and low production efficiency of the transformer. When different production requirements of different transformers exist, the number of turns of the coils of the transformers are correspondingly different, so that the length-width ratio of the coils is correspondingly different, the magnetic gap is required to be reasonably adjusted to meet the coupling ratio, the mould design is required to be carried out again on the winding frameworks produced in batches, the magnetic gap is changed to meet the product requirements, and the design of the frameworks does not meet the product standardization requirements.

Disclosure of Invention

The embodiment of the invention provides a transformer and a microwave cooking appliance.

The transformer according to an embodiment of the present invention includes:

An insulated bobbin, wherein a first spacer is arranged on the inner wall of the bobbin, the first spacer comprises a first spacer block and a second spacer block connected with the first spacer block, and the thickness of the second spacer block is different from that of the first spacer block; and

Two magnetic cores inserted in the winding tube are separated by the first spacing block or the second spacing block at one ends respectively.

In the transformer of the above embodiment, since the first spacer and the second spacer with different thickness are provided in the bobbin, and the two magnetic cores can be abutted against the first spacer or the second spacer according to actual requirements to adjust the space between the two magnetic cores, the transformer can meet the requirements of different specifications or models, and the cost of the transformer is low and the production efficiency is high as a whole.

In some embodiments, the first spacer includes a connection portion connecting the first spacer block and the second spacer block, the second spacer block being closer to a center of the bobbin than the first spacer block, a thickness of the second spacer block being greater than a thickness of the first spacer block, the first spacer block being disposed on an inner wall of the bobbin, and a thickness of the connection portion being less than a thickness of the first spacer block.

In some embodiments, the number of the first spacers is plural, the plurality of first spacers are disposed at intervals along the circumferential direction of the bobbin, the number of the connection portions is plural, and each of the connection portions connects each of the first spacers and the second spacers.

In some embodiments, the second spacer is positioned at the center of the annular structure formed by the plurality of first spacer.

In some embodiments, the second spacer is cylindrical, and the plurality of connecting portions are connected to an outer surface of the second spacer at intervals.

In some embodiments, a winding slot is formed on the outer side of the bobbin, the transformer includes a cover portion at least partially covering the winding slot, the cover portion includes a second spacer corresponding to the first spacer, the second spacer includes a third spacer and a fourth spacer connected to the third spacer, the thickness of the third spacer is the same as that of the first spacer, the thickness of the fourth spacer is the same as that of the second spacer, the other ends of the two cores are separated by the third spacer when one ends of the two cores are separated by the first spacer, and the other ends of the two cores are separated by the fourth spacer when one ends of the two cores are separated by the second spacer.

In some embodiments, the winding slot comprises a primary winding slot and a secondary winding slot, and the transformer comprises a primary winding wound on the primary winding slot and a secondary winding wound on the secondary winding slot.

In some embodiments, the winding slot comprises a filament winding slot, the primary winding slot is located between the filament winding slot and the secondary winding slot, and the transformer comprises a filament winding wound around the filament winding slot.

The embodiment of the invention also provides a microwave cooking appliance, which comprises the transformer of any embodiment and a microwave generator, wherein the microwave generator is connected with the transformer.

In the microwave cooking appliance of the above embodiment, since the first spacer and the second spacer with different thickness are provided in the bobbin, and the two magnetic cores can be abutted against the first spacer or the second spacer according to actual requirements to adjust the space between the two magnetic cores, the transformer can meet the requirements of different specifications or models, and the cost of the transformer is low and the production efficiency is high as a whole.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic structural view of a first spacer according to an embodiment of the present invention.

Fig. 2 is another structural schematic view of the first spacer according to the embodiment of the present invention.

Fig. 3 is a schematic view of still another structure of the first spacer according to the embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view of a transformer according to an embodiment of the present invention.

Fig. 5 is a schematic view of a structure of a transformer according to an embodiment of the present invention with a second spacer removed from a first spacer.

Fig. 6 is a schematic view of a part of the structure of a transformer according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of a second spacer according to an embodiment of the present invention.

Fig. 8 is another structural schematic view of the second spacer according to the embodiment of the present invention.

Fig. 9 is a schematic structural view of a microwave cooking appliance according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of a bobbin of a transformer in the related art.

Description of main reference numerals:

The microwave cooking appliance 200, the transformer 100, the bobbin 10, the tube inner wall 11, the first spacer 12, the first spacer 122, the second spacer 124, the connection portion 126, the winding slot 14, the primary winding slot 142, the secondary winding slot 144, the primary winding 141, the secondary winding 143, the filament winding slot 146, the filament winding 145, the magnetic core 20, the cover portion 30, the second spacer 32, the third spacer 322, the fourth spacer 324, the microwave generator 110, the cavity 130, the cavity 150, and the tray 160.

Detailed Description

Embodiments of the present invention are further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings refer to the same or similar elements or elements having the same or similar functions throughout.

In addition, the embodiments of the present invention described below with reference to the drawings are exemplary only for explaining the embodiments of the present invention and are not to be construed as limiting the present invention.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Referring to fig. 1 to 3, a transformer 100 is provided according to an embodiment of the present invention. The transformer 100 includes an insulated bobbin 10 and two magnetic cores 20. Two cores 20 are inserted in the bobbin 10 in pairs. The first spacer 12 is provided on the inner wall 11 of the bobbin 10, and the first spacer 12 includes a first spacer 122 and a second spacer 124 connected to the first spacer 122, and the thickness D2 of the second spacer 124 is different from the thickness D1 of the first spacer 122. One end of the two cores 20 is separated by a first spacer 122 or a second spacer 124, respectively.

In the transformer 100 of the above embodiment, since the first spacer 122 and the second spacer 124 with different thicknesses are provided inside the bobbin 10, and the two magnetic cores 20 can be abutted against the first spacer 122 or the second spacer 124 according to actual requirements to adjust the space between the two magnetic cores 20, the transformer 100 can meet the requirements of different specifications or models, the cost of the transformer 100 is low, and the production efficiency is high.

Specifically, in one example, the insulating bobbin 10 may be a resin material. The magnetic core 20 may be a copper core or an iron core, etc.

Specifically, in the related art, a preset gap is required to be maintained between two opposite magnetic cores of the transformer according to actual requirements, so that the transformer can meet the preset magnetic gap requirements. The two cores generate eddy current losses during alternating magnetization, while the magnetic gap contributes to a reduction of the eddy current losses. In addition, the coupling ratio of the transformer is related to the size of the magnetic gap, and also to the winding stack height and winding width of the winding. That is, in order to enable the transformation to maintain a proper coupling ratio, the magnetic gap between the two cores or the winding stack height and the winding width of the winding may be adjusted. In the present embodiment, since the two magnetic cores 20 of the present embodiment may be separated by the first spacer 122 or the second spacer 124, the transformer 100 may meet the requirements of different specifications or models, and the transformer 100 may meet the requirements of different coupling ratios, and the coupling ratio may be stabilized in the range of 0.5 to 1.2.

It should be noted that, in the example of fig. 2, the thickness D1 of the first spacer 122 is smaller than the thickness D2 of the second spacer 124, when the gap between the two magnetic cores 20 of the transformer 100 needs to satisfy the thickness D2 of the second spacer 124, one end of the two magnetic cores 20 may be directly abutted against two sides of the second spacer 124 (see fig. 5), and at this time, the first spacer 122 is still connected to the second spacer 124. When the gap between the two magnetic cores 20 of the transformer 100 needs to satisfy the thickness D1 of the first spacer 122, the connection between the first spacer 122 and the second spacer 124 may be broken, for example, directly sheared off, so that the second spacer 124 is separated from the transformer 100, and thus the two magnetic cores 20 may directly abut against opposite sides of the first spacer 122 (see fig. 4).

In another embodiment, the thickness of the first spacer is greater than the thickness of the second spacer, and when the gap between the two magnetic cores of the transformer needs to meet the thickness of the first spacer, the two magnetic cores can be directly abutted against the first spacer, and the first spacer is still connected with the second spacer. When the gap between the two magnetic cores of the transformer needs to meet the thickness of the second spacer, the connection between the first spacer and the second spacer can be broken, so that the first spacer is separated from the transformer, and the two magnetic cores can directly lean against two opposite sides of the second spacer.

In some embodiments, the first spacer 122 and the second spacer 124 may both be sheet-shaped, please refer to fig. 2, in which the plane of the first spacer 122 and the plane of the second spacer 124 may be located on the same plane, in another example, please refer to fig. 3, in which the plane of the first spacer 122 and the plane of the second spacer 124 may be located on different planes, and the positions of the first spacer 122 and the second spacer 124 are not limited herein.

Referring to fig. 1, 5 and 6, in some embodiments, the first spacer 12 includes a connection portion 126, the connection portion 126 connects the first spacer 122 and the second spacer 124, the second spacer 124 is closer to the center of the bobbin 10 than the first spacer 122, the thickness D2 of the second spacer 124 is greater than the thickness D1 of the first spacer 122, the first spacer 122 is disposed on the inner wall 11 of the bobbin 10, and the thickness of the connection portion 126 is smaller than the thickness D1 of the first spacer 122.

In this manner, the first spacer 122 and the second spacer 124 are connected by the connection portion 126, and the thickness of the connection portion 126 is smaller than the first spacer 122, so that when the two magnetic cores 20 need to meet the gap of the thickness D1 of the first spacer 122, the connection of the second spacer 124 and the connection portion 126 can be disconnected to quickly disconnect the second spacer 124 from the transformer 100.

Preferably, the thickness D1 of the first spacer 122 may range from 1.3mm to 1.7mm. The thickness D2 of the second spacer block 124 may range from 1.8mm to 2.2mm.

Specifically, in some embodiments, the first spacer 122 may be generally continuous annular and disposed about the second spacer 124. The second spacer block 124 may be a solid disk. Since the first spacer 122 is disposed on the inner wall 11 of the bobbin 10 and the second spacer 124 is disposed closer to the center of the bobbin 10, when the two cores 20 need to meet the gap of the thickness D2 of the second spacer 124, one ends of the two cores 20 can be directly abutted against the opposite sides of the second spacer 124, and at this time, the first spacer 122 is not in direct contact with the cores 20, that is, the first spacer 122 does not function as a spacer for the cores 20. When the two magnetic cores 20 need to meet the gap of the thickness D1 of the first spacer 122, the connection portion 126 connecting the first spacer 122 and the second spacer 124 can be directly and rapidly broken to separate the second spacer 124 from the transformer 100, so that one ends of the two magnetic cores 20 can abut against two opposite sides of the first spacer 122 disposed on the inner wall 11 of the bobbin 10.

Referring to fig. 1, in some embodiments, the number of first spacers 122 is plural, the plurality of first spacers 122 are disposed at intervals along the circumference of the bobbin 10, and the number of connecting portions 126 is plural, and each connecting portion 126 connects each first spacer 122 and each second spacer 124.

In this way, the second spacer blocks 124 can be fixed on the plurality of first spacer blocks 122, and the structure is simple.

Specifically, in one example, the plurality of first spacer blocks 122 are uniformly spaced along the circumference of the bobbin 10, which may uniformly stress the second spacer blocks 124. The first plurality of spacer blocks 122 form a discontinuous annular structure. For example, in the example shown in fig. 1, the number of the first spacer blocks 122 is 4, and 4 first spacer blocks 122 are disposed at intervals of 90 degrees in the circumferential direction of the bobbin 10.

Referring to fig. 1, in some embodiments, the second spacer 124 is located at the center of the annular structure formed by the plurality of first spacers 122. Thus, the second spacer 124 is easy to separate from the first spacer 122, and the structure is simple, convenient and easy to implement.

Specifically, the number of first spacer blocks 122 may be plural, and the number of second spacer blocks 124 may be single. The plurality of first spacers 122 form an intermittent ring structure, a single second spacer 124 is disposed at the center of the ring structure, and when two magnetic cores 20 need to meet the gap of the thickness D2 of the second spacer 124, one ends of the two magnetic cores 20 can directly abut against opposite sides of the second spacer 124 located at the center of the ring structure. When the two magnetic cores 20 need to satisfy the gap of the thickness D1 of the first spacer 122, the second spacer 124 may be disconnected from the connection with the first spacer 122 so that one end of the two magnetic cores 20 abuts against both sides of the plurality of first spacers 122 opposite to each other.

In some embodiments, the second spacer 124 is cylindrical and the plurality of connecting portions 126 are connected to the outer surface of the second spacer 124 at intervals. Thus, the second spacer 124 is easy to separate from the first spacer 122, and the structure is simple, convenient and easy to implement.

Specifically, the second spacer 124 may be a regular or irregular column, and the regular column is, for example, a cylinder or a square column, and the shape of the second spacer 124 is not limited herein.

Referring to fig. 4, 7 and 8, in some embodiments, the winding slot 14 is formed on the outer side of the bobbin 10, the transformer 100 includes a cover portion 30, the cover portion 30 at least partially covers the winding slot 14, the cover portion 30 includes a second spacer 32 corresponding to the first spacer 12, the second spacer 32 includes a third spacer 322 and a fourth spacer 324 connected to the third spacer 322, the thickness D3 of the third spacer 322 is the same as the thickness D1 of the first spacer 122, the thickness D4 of the fourth spacer 324 is the same as the thickness D2 of the second spacer 124, the other ends of the two cores 20 are separated by the third spacer 322 when one ends of the two cores 20 are separated by the first spacer 122, and the other ends of the two cores 20 are separated by the fourth spacer 324 when one ends of the two cores 20 are separated by the second spacer 124.

In this way, the first spacer 122 and the third spacer 322 are used to separate two ends of the two magnetic cores 20, or the second spacer 124 and the fourth spacer 324 are used to separate two ends of the two magnetic cores 20, so that the transformer 100 can meet the requirements of different specifications or models, and the cost of the transformer 100 is lower and the production efficiency is higher as a whole.

It should be noted that the first spacer block 122 and the third spacer block 322 may be uniform or non-uniform in shape and size. The second spacer block 124 and the fourth spacer block 324 may be uniform or non-uniform in shape and size. In one embodiment, first spacer 122 is used to separate one end of two cores 20 and third spacer 322 is used to separate the other end of two cores 20. In another embodiment, a second spacer 124 is used to separate one end of the two cores 20 and a fourth spacer 324 is used to separate the other end of the two cores 20. The first spacer 12 is located at the center gap a of the bobbin 10. The second spacer 32 is located at a side interval B of the cover 30.

Referring to fig. 5, in some embodiments, the winding slot 14 includes a primary winding slot 142 and a secondary winding slot 144, and the transformer 100 includes a primary winding 141 wound around the primary winding slot 142 and a secondary winding 143 wound around the secondary winding slot 144. This makes the structure of the transformer 100 simple.

Specifically, the primary winding 141 and the secondary winding 143 may be wound with copper wires and aluminum wires having high electrical conductivity. In some embodiments, the primary winding 141 and the secondary winding 143 may each be a layered winding. The layered winding has compact structure and high production efficiency.

Referring to fig. 5, in some embodiments, the wire winding slots 14 include filament winding slots 146, with the primary winding slots 142 being located between the filament winding slots 146 and the secondary winding slots 144. The transformer 100 includes a filament winding 145 wound in a filament winding slot 146. In this way, an external microwave generator can be connected via the filament winding 145, so that the microwave generator can be supplied with power.

Referring to fig. 1 and 9, the embodiment of the invention further provides a microwave cooking appliance 200. The microwave cooking appliance 200 includes the transformer 100 and the microwave generator 110 of any of the above embodiments. The microwave generator 110 is connected to the transformer 100.

In the microwave cooking appliance 200 of the above embodiment, since the first spacer 122 and the second spacer 124 with different thicknesses are provided inside the bobbin 10, and the two magnetic cores 20 can be abutted against the first spacer 122 or the second spacer 124 according to actual requirements to adjust the space between the two magnetic cores 20, the transformer 100 can meet the requirements of different specifications or models, the cost of the transformer 100 is low, and the production efficiency is high as a whole.

It will be appreciated that the filament winding 145 of the transformer 100 is connected to a microwave generator. Specifically, the microwave generator 110 may be a magnetron. A magnetron is an electric vacuum device used to generate microwave energy. Electrons in the magnetron interact with the high frequency electromagnetic field under the control of the constant magnetic field and the constant electric field perpendicular to each other to convert energy obtained from the output power of the transformer 100 into microwave energy, thereby achieving the purpose of generating microwave energy.

Specifically, the microwave cooking appliance 200 further includes a cavity 120, a door (not shown), and a fan 150. The tray 160 is disposed in the cavity 130, the tray 160 is used for placing food to be heated, the door body is rotatably disposed in front of the cavity 130 and is used for opening or closing the opening of the cavity 130, and the microwave generator 110 and the transformer 100 are mounted on the outer side of the cavity 130 and are disposed in the blowing direction of the fan 150. When the microwave cooking appliance 200 operates, the transformer 100 supplies an operating current to the microwave generator 110, and the microwave generator 110 generates microwave energy for heating the food in the cavity 130. Meanwhile, the fan 150 may absorb air from the outside and form an air flow, the air flow may be conducted through the air duct in the transformer 100 and cool the transformer 100, and after cooling the transformer 100, the air flow may be discharged from the transformer 100 to the outside of the microwave cooking appliance 200.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, unless specifically defined otherwise.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art within the scope of the invention, which is defined by the claims and their equivalents.

Claims

1. A transformer, comprising:

Two magnetic cores inserted in the winding tube, wherein one ends of the two magnetic cores are respectively separated by the first spacing block or the second spacing block;

the number of the first spacing blocks is a plurality, and the second spacing blocks are positioned at the center of the annular structure formed by the plurality of first spacing blocks.

2. The transformer of claim 1, wherein the first spacer includes a connection portion connecting the first spacer and the second spacer, the second spacer being closer to a center of the bobbin than the first spacer, a thickness of the second spacer being greater than a thickness of the first spacer, the first spacer being disposed on a tube inner wall of the bobbin, a thickness of the connection portion being less than a thickness of the first spacer.

3. The transformer of claim 2, wherein the plurality of first spacers are disposed at intervals along the circumference of the bobbin, the number of the connection portions being plural, each of the connection portions connecting each of the first spacers and the second spacers.

4. The transformer of claim 2, wherein the second spacer has a cylindrical shape, and the plurality of connection portions are connected to the outer surface of the second spacer at intervals.

5. The transformer of claim 1, wherein a winding slot is formed on an outer side of the bobbin, the transformer includes a cover part at least partially covering the winding slot, the cover part includes a second spacer corresponding to the first spacer, the second spacer includes a third spacer and a fourth spacer connected to the third spacer, the third spacer has a thickness identical to that of the first spacer, the fourth spacer has a thickness identical to that of the second spacer, and when one ends of the two cores are separated by the first spacer, the other ends of the two cores are separated by the third spacer, and when one ends of the two cores are separated by the second spacer, the other ends of the two cores are separated by the fourth spacer, respectively.

6. The transformer of claim 5, wherein the winding slot comprises a primary winding slot and a secondary winding slot, the transformer comprising a primary winding wound around the primary winding slot and a secondary winding wound around the secondary winding slot.

7. The transformer of claim 6, wherein the winding slot comprises a filament winding slot, the primary winding slot is located between the filament winding slot and the secondary winding slot, and the transformer comprises a filament winding wound around the filament winding slot.

8. A microwave cooking appliance comprising the transformer of any one of claims 1-7 and a microwave generator, the microwave generator being connected to the transformer.