Common mode filter

Abstract

The utility model relates to the technical field of filters, in particular to a common mode filter, which comprises a filter shell, a magnetic core, a coil and pins, the magnetic core is embedded in the filter shell, and the coil is arranged on the outer side of the magnetic core. The sponge blocks and the clamping blocks protect the pins, deflection or breakage caused by collision between the pins and the transport box during overall transportation of the common mode filter is reduced, the outer sides of the clamping blocks are tightly attached to the inner sides of the elastic protrusions, the outer sides of the clamping blocks extrude the inner sides of the elastic protrusions, the elastic protrusions provide opposite acting force, and then the protection box is fixed. The protection box and the filter shell are fixed again through magnetic attraction of the first magnet and the second magnet, so that falling of the protection box in the whole transportation process of the common-mode filter is reduced, the protection effect on the pins is better, and loss of the whole transportation process of the common-mode filter is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a common mode filter. Background Art

[0002] Common mode filters usually adopt ferrite cores, are wound with two wires in parallel, suppress interference sources with low differential mode noise signals, are difficult to deform in high-speed signals, have good noise suppression countermeasures, high common mode noise suppression and low differential mode noise signal suppression, and are used to eliminate the "switching interference" unique to switching power supplies. The design of common mode filters is relatively simple, including common mode capacitors, unbalanced transformers or common mode inductors.

[0003] The wires wound on the surface of the existing common mode filter are usually embedded in the filter housing, and the two ends of the wires are respectively fixedly connected to the corresponding pins to realize the passage of current. The pins are embedded on the outside of the filter, and the pins are located on the outside of the filter. When the common mode filter is transported, the transport vehicle travels on an uneven road surface, and the pins of the common mode filter are likely to collide with the inner wall of the transport box, causing the pins to be skewed or broken, resulting in damage to the overall filter and increasing the overall transport loss of the common mode filter. Therefore, in view of the above problems, we propose a common mode filter. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a common mode filter to solve the problem that when the common mode filter is transported, the transport vehicle travels on an uneven road surface, and the pins of the common mode filter are likely to collide with the inner wall of the transport box, causing the pins to be skewed or broken, resulting in damage to the overall filter and increasing the overall transport loss of the common mode filter.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A common mode filter includes a filter housing, a magnetic core, a coil and pins. The filter housing is embedded with a magnetic core, the magnetic core is provided with a coil on the outside, a connection component is provided on the outside of the lower end of the magnetic core, a first placement groove is opened on the inner side of the upper end of the connection component, a conductive plate is fixedly connected inside the connection component, a second placement groove is opened on the inner side of the lower end of the connection component, a compression spring is fixedly connected to the lower end of the connection component, a pin is provided inside the second placement groove, connection blocks are fixedly connected to the left and right ends of the pin, bolts are provided at the lower ends of the connection blocks, a protection box is provided at the lower end of the filter housing, a sponge block is fixedly connected inside the protection box, a clamping block is fixedly connected to the upper end of the protection box, a first magnet is fixedly connected to the inner side of the upper end of the clamping block, a card slot is opened on the inner side of the lower end of the filter housing, a second magnet is fixedly connected to the upper end of the card slot, and elastic protrusions are fixedly connected to the left and right ends of the card slot.

[0007] Preferably, the number of magnetic cores is two, the ends of the coils are located in the first placement grooves, and the ends of the coils are in contact with the conductive plates.

[0008] Preferably, the connecting component is in the shape of a circular ring, the number of the first placement grooves is two, and the lower ends of the conductive plates are in contact with the upper ends of the pins.

[0009] Preferably, the number of the second placement grooves is two. The lower ends of the compression springs are fixedly connected to the filter housing. The lower ends of the pins pass through the filter housing, and the lower ends of the pins are inserted into the sponge blocks.

[0010] Preferably, the upper ends of the bolts pass through the connecting blocks, and the outer sides of the upper ends of the bolts are in screw connection with the inner sides of the lower ends of the connecting components. The interior of the protection box is hollow. The clamping blocks are located inside the clamping grooves. The outer sides of the clamping blocks are in close contact with the inner sides of the elastic protrusions. The first magnet and the second magnet attract each other magnetically.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the present utility model, by providing the protection box, sponge blocks, clamping blocks, first magnet, second magnet and elastic protrusions, the sponge blocks and the clamping blocks protect the pins, reducing the skew or breakage of the pins caused by the collision between the pins and the transport box during the overall transportation of the common mode filter. The outer sides of the clamping blocks are in close contact with the inner sides of the elastic protrusions. The outer sides of the clamping blocks squeeze the inner sides of the elastic protrusions, and the elastic protrusions provide a reverse acting force, thereby fixing the protection box. Through the magnetic attraction between the first magnet and the second magnet, the protection box and the filter housing are fixed again, thus reducing the dropping of the protection box during the overall transportation of the common mode filter, and further improving the protection effect on the pins and reducing the loss of the common mode filter during the overall transportation. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is for the present utility model Figure 1 Schematic diagram of the structure at A;

[0015] Figure 3 It is for the present utility model Figure 1 Schematic diagram of the structure at B;

[0016] Figure 4 It is a schematic diagram of the connecting component structure of the present utility model;

[0017] Figure 5 It is a schematic diagram of the conductive plate structure of the present utility model.

[0018] In the figure: 1. Filter housing; 2. Core; 3. Coil; 4. Connection component; 5. First placement groove; 6. Conductive plate; 7. Second placement groove; 8. Compression spring; 9. Pin; 10. Connection block; 11. Bolt; 12. Protection box; 13. Sponge block; 14. Clamping block; 15. First magnet; 16. Card slot; 17. Second magnet; 18. Elastic protrusion. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0021] A common-mode filter includes a filter housing 1, a core 2, a coil 3 and a pin 9. The filter housing 1 is embedded with a core 2, a coil 3 is arranged outside the core 2, a connection component 4 is arranged outside the lower end of the core 2, a first placement groove 5 is opened inside the upper end of the connection component 4, a conductive plate 6 is fixedly connected inside the connection component 4, a second placement groove 7 is opened inside the lower end of the connection component 4, a compression spring 8 is fixedly connected to the lower end of the connection component 4, a pin 9 is arranged inside the second placement groove 7, connection blocks 10 are fixedly connected to the left and right ends of the pin 9, a bolt 11 is arranged at the lower end of the connection block 10, a protection box 12 is arranged at the lower end of the filter housing 1, a sponge block 13 is fixedly connected inside the protection box 12, a clamping block 14 is fixedly connected to the upper end of the protection box 12, a first magnet 15 is fixedly connected inside the upper end of the clamping block 14, a card slot 16 is opened inside the lower end of the filter housing 1, a second magnet 17 is fixedly connected to the upper end of the card slot 16, and elastic protrusions 18 are fixedly connected to the left and right ends of the card slot 16.

[0022] There are two magnetic cores 2. The ends of the coil 3 are located in the first placement groove 5, and the ends of the coil 3 are in contact with the conductive plate 6. The connecting component 4 is in a circular ring shape. There are two first placement grooves 5. The lower end of the conductive plate 6 is in contact with the upper end of the pin 9. There are two second placement grooves 7. The lower end of the compression spring 8 is fixedly connected to the filter housing 1. The lower end of the pin 9 passes through the filter housing 1, and the lower end of the pin 9 is inserted into the sponge block 13. The upper end of the bolt 11 passes through the connecting block 10, and the outer side of the upper end of the bolt 11 is screwed with the inner side of the lower end of the connecting component 4. The inside of the protection box 12 is hollow. The clamping block 14 is located inside the clamping groove 16, and the outer side of the clamping block 14 is in close contact with the inner side of the elastic protrusion 18. The first magnet 15 and the second magnet 17 attract each other magnetically. The filter housing 1 is embedded with a magnetic core 2. A coil 3 is provided outside the magnetic core 2. A connecting component 4 is provided outside the lower end of the magnetic core 2. The inner side of the upper end of the connecting component 4 is provided with a first placement groove 5. A conductive plate 6 is fixedly connected inside the connecting component 4. The inner side of the lower end of the connecting component 4 is provided with a second placement groove 7. A compression spring 8 is fixedly connected to the lower end of the connecting component 4. A pin 9 is provided inside the second placement groove 7. The left and right ends of the pin 9 are fixedly connected with a connecting block 10, and a bolt 11 is provided at the lower end of the connecting block 10. A protection box 12 is provided at the lower end of the filter housing 1, which facilitates the setting of the protection box 12, sponge block 13, clamping block 14, first magnet 15, second magnet 17 and elastic protrusion 18. The sponge block 13 and the clamping block 14 protect the pin 9, reducing the skew or breakage of the pin 9 when it collides with the transport box during the overall transportation of the common mode filter. The outer side of the clamping block 14 is in close contact with the inner side of the elastic protrusion 18. The outer side of the clamping block 14 squeezes the inner side of the elastic protrusion 18, and the elastic protrusion 18 provides a reverse force, thereby fixing the protection box 12. Through the magnetic attraction between the first magnet 15 and the second magnet 17, the protection box 12 and the filter housing 1 are fixed again, thereby reducing the dropping of the protection box 12 during the overall transportation of the common mode filter, and further having a better protection effect on the pin 9 and reducing the loss during the overall transportation of the common mode filter; A sponge block 13 is fixedly connected inside the protection box 12, a clamping block 14 is fixedly connected to the upper end of the protection box 12, a first magnet 15 is fixedly connected to the inner side of the upper end of the clamping block 14, a clamping groove 16 is provided inside the lower end of the filter housing 1, a second magnet 17 is fixedly connected to the upper end of the clamping groove 16, and elastic protrusions 18 are fixedly connected to the left and right ends of the clamping groove 16.

[0023] Workflow: When the device is in use, a magnetic core 2 is embedded in the filter housing 1, a coil 3 is arranged outside the magnetic core 2, a connection component 4 is arranged outside the lower end of the magnetic core 2, a compression spring 8 is fixedly connected to the lower end of the connection component 4, the lower end of the compression spring 8 is fixedly connected to the filter housing 1, the compression spring 8 supports the connection component 4, a first placement groove 5 is formed inside the upper end of the connection component 4, a conductive plate 6 is fixedly connected inside the connection component 4, a second placement groove 7 is formed inside the lower end of the connection component 4, the end of the coil 3 is located in the first placement groove 5, the compression spring 8 provides a reverse acting force to the connection component 4, so that the end of the coil 3 and the upper end of the conductive plate 6 are in contact, a pin 9 is arranged inside the second placement groove 7, connection blocks 10 are fixedly connected to the left and right ends of the pin 9, a bolt 11 is arranged at the lower end of the connection block 10, the bolt 11 passes through the connection block 10, and the outer side of the upper end of the connection block 10 is in screw connection with the inner side of the lower end of the connection component 4, so that the pin 9 and the connection component 4 are fixed, the upper end of the pin 9 is in contact with the lower end surface of the conductive plate 6, so that the first placement groove 5 is connected and can be energized through the conductive plate 6 and the pin 9, the lower end of the pin 9 passes through the filter housing 1, a protection box 12 is arranged at the lower end of the filter housing 1, a sponge block 13 is fixedly connected inside the protection box 12, the lower end of the pin 9 is inserted into the sponge block 13, and the sponge block 13 and the clamping block 14 protect the pin 9, reducing the skew or breakage of the pin 9 caused by the collision between the pin 9 and the transport box during the overall transportation of the common mode filter. A clamping block 14 is fixedly connected to the upper end of the protection box 12, a first magnet 15 is fixedly connected to the inner side of the upper end of the clamping block 14, a card slot 16 is formed inside the lower end of the filter housing 1, a second magnet 17 is fixedly connected to the upper end of the card slot 16, elastic protrusions 18 are fixedly connected to the left and right ends of the card slot 16, the clamping block 14 is located inside the card slot 16, the outer side of the clamping block 14 is in close contact with the inner side of the elastic protrusion 18, the outer side of the clamping block 14 presses the inner side of the elastic protrusion 18, and the elastic protrusion 18 provides a reverse acting force to fix the protection box 12. Through the magnetic attraction between the first magnet 15 and the second magnet 17, the protection box 12 and the filter housing 1 are fixed again, reducing the dropping of the protection box 12 during the overall transportation of the common mode filter, and further improving the protection effect on the pin 9 and reducing the loss during the overall transportation of the common mode filter.

[0024] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A common mode filter, comprising a filter housing (1), a magnetic core (2), a coil (3) and a pin (9), characterized in that: A magnetic core (2) is embedded in the filter housing (1), a coil (3) is arranged on the outside of the magnetic core (2), a connecting component (4) is arranged on the outside of the lower end of the magnetic core (2), a first placement groove (5) is provided on the inner side of the upper end of the connecting component (4), a conductive plate (6) is fixedly connected to the inside of the connecting component (4), a second placement groove (7) is provided on the inner side of the lower end of the connecting component (4), a compression spring (8) is fixedly connected to the lower end of the connecting component (4), a pin (9) is provided inside the second placement groove (7), and the left and right ends of the pin (9) are fixedly connected to connecting blocks (10), a bolt (11) is provided at the lower end of the connection block (10), a protection box (12) is provided at the lower end of the filter housing (1), a sponge block (13) is fixedly connected inside the protection box (12), a clamping block (14) is fixedly connected at the upper end of the protection box (12), a first magnet (15) is fixedly connected to the inner side of the upper end of the clamping block (14), a clamping groove (16) is provided at the inner side of the lower end of the filter housing (1), a second magnet (17) is fixedly connected to the upper end of the clamping groove (16), and elastic protrusions (18) are fixedly connected to the left and right ends of the clamping groove (16).

2. A common mode filter according to claim 1, characterized in that: There are two magnetic cores (2), the end of the coil (3) is located in the first placement groove (5), and the end of the coil (3) is in contact with the conductive plate (6).

3. A common mode filter according to claim 1, characterized in that: The connecting component (4) is in the shape of a ring, the first placement grooves (5) are two in number, and the lower end of the conductive plate (6) fits the upper end of the pin (9).

4. A common mode filter according to claim 1, characterized in that: The number of the second placement grooves (7) is two, the lower end of the compression spring (8) is fixedly connected to the filter housing (1), the lower end of the pin (9) passes through the filter housing (1), and the lower end of the pin (9) is inserted into the interior of the sponge block (13).

5. A common mode filter according to claim 1, characterized in that: The upper end of the bolt (11) passes through the connecting block (10), the outer side of the upper end of the bolt (11) and the inner side of the lower end of the connecting assembly (4) are spirally connected, the interior of the protection box (12) is hollow, the clamping block (14) is located inside the clamping groove (16), the outer side of the clamping block (14) and the inner side of the elastic protrusion (18) are tightly fitted, and the first magnet (15) and the second magnet (17) are magnetically attracted to each other.

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