CN212625477U - Filter device of magnetron and magnetron - Google Patents

Abstract

The utility model discloses a filter equipment and magnetron of magnetron, filter equipment includes: choke coil, first magnetic core, second magnetic core. The choke coil includes: the first densely wound coil, the first sparse coil and the second densely wound coil are arranged on the same plane, one end of the first sparse coil is connected with the first densely wound coil, the second densely wound coil is connected with the other end of the first sparse coil, and the first sparse coil is arranged between the first densely wound coil and the second densely wound coil. The first magnetic core is arranged in the first close-wound coil; the second magnetic core is arranged in the second close-wound coil, and a gap is formed between the second magnetic core and the first magnetic core. Through the technical scheme, the problems of common mode noise suppression and magnetron volume reduction are solved by reasonably arranging the close-wound coil, the sparse-wound coil and the magnetic core.

Description

Filter device of magnetron and magnetron

Technical Field

The utility model relates to a magnetron technical field, in particular to filter and magnetron including this filter.

Background

The magnetron filtering device is a pi-type low-pass filter consisting of a through capacitor and two choke coils and mainly used for filtering common-mode noise led out by a cathode support rod.

In practical application, the magnetron is used as a core component of microwave equipment, and the volume of the magnetron directly influences the space occupied by the whole electric appliance chamber of the microwave equipment. In the related art, there is still a problem that the size of the magnetron is large, resulting in that the volume of the shield case cannot be reduced. In order to improve the practicability of microwave equipment, it is necessary to design a technology for reducing the volume of the magnetron while ensuring the suppression of common mode noise.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. For this reason, an object of the utility model is to provide a filter equipment with choke coil and magnetic core, the utility model discloses a will close around the coil and dredge the reasonable overall arrangement of coil and set up the magnetic core in close around the coil, provide one kind and can also reduce choke coil's filter equipment when keeping good filtering performance.

Another object of the present invention is to provide a magnetron, which has the effect of reducing the volume of the magnetron while suppressing the common mode noise by applying the above filtering device.

According to the utility model discloses a filtering device, include: choke coil, first magnetic core, second magnetic core. The choke coil includes: the first densely wound coil, the first sparse coil and the second densely wound coil are arranged on the same plane, one end of the first sparse coil is connected with the first densely wound coil, the second densely wound coil is connected with the other end of the first sparse coil, and the first sparse coil is arranged between the first densely wound coil and the second densely wound coil. The first magnetic core is arranged in the first close-wound coil; the second magnetic core is arranged in the second close-wound coil, and a gap is formed between the second magnetic core and the first magnetic core.

According to the utility model discloses a filter equipment, first close coil and the close coil of winding of second link to each other respectively in first sparse coil both sides, play and filter the clutter to reduce the effect of volume. The first close-wound coil is wound on the first magnetic core, the second close-wound coil is wound on the second magnetic core, a gap is reserved between the first magnetic core and the second magnetic core, and the filter device with the two magnetic cores can enhance the suppression effect of common-mode noise.

In addition, according to the utility model discloses a filter equipment still can have following additional technical characteristics:

further, there is no gap between the coils in the first close-wound coil, there is no gap between the coils in the second close-wound coil, there is a gap between the coils of the first sparse-wound coil, and there is a gap between the first sparse-wound coil and the first close-wound coil and the second close-wound coil.

Further, the number of winding turns of the first close-wound coil is in the range of 4 to 5; and/or the number of winding turns of the second close-wound coil is in the range of 4 to 5; and/or the number of winding turns of the first sparse winding coil is 4.

Further, an outer diameter of the choke coil is in a range of 5.7 mm to 6.3 mm; and/or the inductance of the choke coil is in the range of 0.3 to 0.6 muh.

Further, the choke coil further includes: and the second sparse winding coil and the first sparse winding coil are respectively connected to two ends of the second close winding coil.

Further, the number of winding turns of the second sparse winding coil is 3.4; and/or the total length of the choke coil is in the range of 29 mm to 31 mm.

Further, the first magnetic core protrudes from an end portion of the first close-wound coil far from the first loosely wound coil, and the second magnetic core protrudes from an end portion of the second close-wound coil far from the first loosely wound coil.

Further, the first and second magnetic cores each have a diameter in a range of 2.85 millimeters to 3.15 millimeters; and/or a gap of 2mm to 10mm is provided between the first magnetic core and the second magnetic core.

According to the utility model discloses a magnetron, include: the capacitor, the tube core and the filter device are all arranged in the shielding box, one end of the choke coil, close to the first close-wound coil, is connected with the capacitor, and one end of the choke coil, close to the second close-wound coil, is connected with the filter device.

Drawings

Fig. 1 is a schematic structural diagram of the filtering apparatus of the present invention.

Fig. 2 is a schematic structural diagram of a filtering apparatus according to an embodiment of the present invention.

Fig. 3 is a side view of a filter device according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a filtering apparatus according to another embodiment of the present invention.

Fig. 5 is a side view of a filter device according to another embodiment of the present invention.

Fig. 6 is a schematic diagram of a magnetron structure according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a combination of a shielding box and a filtering apparatus according to an embodiment of the present invention.

Fig. 8 is a graph of test results of detecting radiated noise (30MHZ-1GHZ) using a filtering apparatus according to an embodiment of the present invention.

Fig. 9 is a graph of test results of detecting radiation noise (30MHZ-1GHZ) using a related art filtering apparatus.

Reference numerals:

a magnetron 1000 is provided which has a magnetron body,

a filter device 1, a shield can 2, a die 3, a capacitor 4,

a choke coil 11, a first magnetic core 13, a second magnetic core 15,

a first close-wound coil 111, a second close-wound coil 112, a first loosely wound coil 113, and a second loosely wound coil 114.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, the present embodiment provides a filter device 1 for a magnetron 1000, including: choke coil 11, first magnetic core 13, second magnetic core 15. The choke coil 11 includes: the coil comprises a first close-wound coil 111, a first sparse winding coil 113 and a second close-wound coil 112, wherein one end of the first sparse winding coil 113 is connected with the first close-wound coil 111, the second close-wound coil 112 is connected with the other end of the first sparse winding coil 113, and the first sparse winding coil 113 is arranged between the first close-wound coil 111 and the second close-wound coil 112. First magnetic core 13 is disposed in first close-wound coil 111; second magnetic core 15 is provided in second close-wound coil 112, and second magnetic core 15 and first magnetic core 13 have a gap therebetween. That is, the first close-wound coil 111 and the second close-wound coil 112 are respectively disposed on both sides of the first loose-wound coil 113, and the choke coil 11 occupies a smaller volume after the first close-wound coil 111 and the second close-wound coil 112 are disposed without changing the number of turns. In addition, the first close-wound coil 111 is wound around the first magnetic core 13, and the second close-wound coil 112 is wound around the second magnetic core 15, so that the filter device 1 having two magnetic cores can enhance the suppression effect of the common mode noise.

Specifically, the filter device 1 of the present embodiment is located inside a shielding box at the input side of the magnetron 1000, and both ends of the shielding box are respectively connected to a capacitor 4 and a tube core 3 of the magnetron 1000, and is used for filtering high-frequency noise and ac noise at the input end, and includes a first tightly wound coil 111 portion, a middle loosely wound coil portion, and a second tightly wound coil 112 portion, wherein the tightly wound coil includes the above-mentioned magnetic core, such as a ferrite core element. The filtering coil structure of the embodiment can effectively reduce radiation noise after a large number of tests. As shown in fig. 8 to 9, after the size of the filter device 1 is reduced, it is detected that the common mode noise result of the filter device 1 using the structure at the low frequency band is equivalent to the level before the structure is not changed, in other words, the size can be reduced properly while the same dielectric withstand voltage distance as that of the prior art is maintained using the filter device 1.

Alternatively, there is no gap between the coils in the first close-wound coil 111, no gap between the coils in the second close-wound coil 112, a gap between the coils of the first open-wound coil 113, and a gap between the first open-wound coil 113 and the first close-wound coil 111 and the second close-wound coil 112. And no gap is reserved between the close-wound coils, so that on one hand, the occupied space can be reduced, the magnetic flux is large during close winding, the capacitance 4 is large, and the practicability of the filter device 1 is enhanced. In addition, the close-wound coil of the present invention may be provided with a small gap, or may be provided with a sparse coil to appropriately reduce the gap.

Optionally, the number of winding turns of the first close-wound coil 111 is in the range of 4 to 5 turns, and preferably, the number of winding turns of the first close-wound coil 111 is 4.25 turns; the number of winding turns of the second close-wound coil 112 is in the range of 4 to 5, preferably, the second close-wound coil 112 is 4.25; the first loose winding coil 113 has 4 winding turns. That is, the choke coil 11 is preferably wound for 12.5 turns in total.

Alternatively, the choke coil 11 has an outer diameter in the range of 5.7 mm to 6.3 mm, or the inductance of the choke coil 11 is in the range of 0.3 to 0.6 μ H. It is thus ensured that the filter device 1 can still exhibit a good suppression of common-mode signals with a reduced volume of the choke coil 11.

As shown in fig. 2-3, the utility model provides an embodiment, 12.5 circles are convoluteed altogether to the coil, and the right is first close 4.25 circles of coiling around coil 111, and the centre is first sparse coil 113 and coils 4 circles, and the close coil 112 of coiling 4.25 circles of left side second, and there is no clearance between the close coil coiling, and the length L (distance between the both ends about the coil) of coil chooses the scope: 25 ± 1 (mm); the diameter D1 of the coil (the distance between the upper end point and the lower end point after the coil is wound) is selected in the range: 6 + -0.3 (mm), A (the total height of the filter device 1) is 10-12 mm.

Wherein, the close-wound coil has a magnetic core, and the sparse-wound coil has no magnetic core. First close-wound coil 111 is wound around first magnetic core 13, and second close-wound coil 112 is wound around second magnetic core 15. The lengths B of the two magnetic cores are the same and are 7-9mm, and the diameters D2 of the magnetic cores are in the selected range: 3 +/-0.15 (mm), the distance between the magnetic cores is 2-10mm, and the selection range of the inductance of the coil is as follows: 0.3-0.6 (uH).

Specifically, the core protrusion length S at both ends of the coil is 1 to 2mm, the length of L1 (the total length from the third turn of the first loosely wound coil 113 to the first turn of the second tightly wound coil 112) is 4 to 5mm, the length of L2 (the distance between the second and third turns of the first loosely wound coil 113) is 0.5 to 2mm, and the length of L3 (the distance between the first and second turns of the first loosely wound coil 113) is 1.5 to 3 mm. It is known that in the related art, the diameter of the core is 5mm, the diameter of the coil is 8mm, and the length of the coil is 33 mm. Therefore, in the present embodiment, the core diameter is reduced by 40%, the coil diameter is reduced by 25%, and the coil length is reduced by 24%.

Optionally, in some embodiments of the present invention, the choke coil 11 further includes: the second loosely wound coil 114, the second loosely wound coil 114 and the first loosely wound coil 113 are connected to two ends of the second densely wound coil 112, respectively.

Optionally, the second loose winding coil 114 has a winding number of 3.4 turns; or the total length of the choke coil 11 is in the range of 29 mm to 31 mm.

Alternatively, first magnetic core 13 protrudes the end of first close-wound coil 111 away from first open-wound coil 113, and second magnetic core 15 protrudes the end of second close-wound coil 112 away from first open-wound coil 113.

Alternatively, first magnetic core 13 and second magnetic core 15 may each have a diameter in the range of 2.85 mm to 3.15 mm, or first magnetic core 13 may have a gap between second magnetic core 15 of 2mm to 10 mm.

As shown in fig. 4-5, according to the above technical features, the present invention further provides another embodiment, wherein the coil is wound for 15.9 turns, and sequentially from right to left: the first close-wound coil 111 is wound for 4.25 circles, the first sparse-wound coil 113 is wound for 4 circles, the second close-wound coil 112 is wound for 4.25 circles, the second sparse-wound coil 114 is wound for 3.4 circles, no gap exists between close-wound part coil windings, and the length L (distance between the left end point and the right end point of the coil) of the coil is within a selected range: 30 ± 1 (mm); the diameter D1 of the coil (the distance between the upper end point and the lower end point after the coil is wound) is selected in the range: 6 + -0.3 (mm), A (the total height of the filter device 1) is 10-12 mm.

Wherein, the close-wound coil has a magnetic core, and the sparse-wound coil has no magnetic core. The diameter D2 of the magnetic core is selected from the following range: 3 +/-0.15 (mm), the length of a right magnetic core is 7-9mm, the length of a left magnetic core is 5-7mm, the distance between the magnetic cores is 2-10mm, the length S of a protruding coil of the right magnetic core is 1-2mm, the length of L1 (the distance between the second circle and the last three circles of the second sparse winding coil 114) is 3-5mm, the length of L2 (the distance between the second circle and the last four circles of the second dense winding coil 112) is 0.5-2mm, the length of L3 (the distance between the third circle and the first circle of the second sparse winding coil 113) is 4-5mm, the length of L4 (the distance between the second circle and the third circle of the first sparse winding coil 113) is 0.5-2mm, and the length of L4 is 1.5-3 mm. Selecting the range of coil inductance: 0.3-0.6 (uH). It is known that the core diameter is 5mm, the coil diameter is 8mm, and the coil length is 33mm in the related art. Therefore, the diameter of the magnetic core of the present embodiment is reduced by 40% and the diameter of the coil is reduced by 25%, although the length is reduced less, the increased sparse winding coil without the magnetic core at the leftmost side can effectively reduce the temperature of the coil.

Among them, in some examples of the present invention, the length of the two ends of first magnetic core 13 extending out of first close-wound coil 111 is not more than 1 to 2mm, and the length of the two ends of second magnetic core 15 extending out of second close-wound coil 112 is not more than 1 and is more than 2 mm.

The magnetron 1000 according to the present invention includes: the shielding box 2, the tube core 3, the capacitor 4, the filter device 1, the capacitor 4, the tube core 3 and the filter device 1 are all arranged in the shielding box 2, one end of the choke coil 11 close to the first close-wound coil 111 is connected with the capacitor 4, and one end of the choke coil 11 close to the second close-wound coil 112 is connected with the filter device 1.

As shown in fig. 6-7, according to the magnetron 1000 of the present invention, the filter 1 applying the above structure is installed in the shielding box 2, and two ends of the filter 1 are respectively connected with the capacitor 4 and the tube core 3 of the magnetron 1000, wherein the tube core 3 includes a cathode terminal, and the cathode terminal connecting part is connected. Because the diameter of the choke coil 11 is reduced, the winding length is reduced, therefore, under the premise that the original insulation distance is kept unchanged at the upper side and the lower side, the length and the width of the square shielding box 2 can be reduced by at least about 4mm, the height is reduced by about 2mm, and the effects of inhibiting common mode noise and reducing the volume of the magnetron 1000 are achieved.

In the description of the present invention, it is to be understood that the terms "length", "width", "height", "up", "down", "front", "back", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (9)

1. A filtering apparatus, comprising:

the choke coil comprises a first close-wound coil, a first sparse winding coil and a second close-wound coil, one end of the first sparse winding coil is connected with the first close-wound coil, the second close-wound coil is connected with the other end of the first sparse winding coil, and the first sparse winding coil is arranged between the first close-wound coil and the second close-wound coil;

the first magnetic core is arranged in the first close-wound coil;

and the second magnetic core is arranged in the second close-wound coil, and a gap is formed between the second magnetic core and the first magnetic core.

2. The filtering device according to claim 1, wherein there is no gap between the coils in the first close-wound coil, no gap between the coils in the second close-wound coil, a gap between the coils of the first open-wound coil, and a gap between the first open-wound coil and the first close-wound coil and the second close-wound coil.

3. Filtering device according to claim 1,

the number of winding turns of the first close-wound coil is within the range of 4 to 5; and/or

The number of winding turns of the second close-wound coil is within the range of 4 to 5; and/or

The number of winding turns of the first sparse winding coil is 4.

4. Filtering device according to claim 1,

the choke coil has an outer diameter in a range of 5.7 mm to 6.3 mm; and/or

The inductance of the choke coil is in the range of 0.3 to 0.6 muh.

5. The filtering device according to any one of claims 1 to 4, wherein the choke coil further comprises:

and the second sparse winding coil and the first sparse winding coil are respectively connected to two ends of the second close winding coil.

6. Filtering device according to claim 5,

the number of winding turns of the second sparse winding coil is 3.4; and/or

The choke coil has a total length in the range of 29 mm to 31 mm.

7. The filtering device according to claim 1, wherein said first magnetic core protrudes from an end of said first densely wound coil distal from said first loosely wound coil, and said second magnetic core protrudes from an end of said second densely wound coil distal from said first loosely wound coil.

8. Filtering device according to claim 1,

the first and second magnetic cores each have a diameter in a range of 2.85 millimeters to 3.15 millimeters; and/or

The first magnetic core and the second magnetic core have a gap of 2mm to 10mm therebetween.

9. A magnetron, characterized by comprising a shielding box, a tube core, a capacitor and a filter device, wherein the capacitor, the tube core and the filter device are all arranged in the shielding box, the filter device is the filter device according to any one of claims 1-8, one end of the choke coil close to the first close-wound coil is connected with the capacitor, and one end of the choke coil close to the second close-wound coil is connected with the filter device.

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