A filter

Abstract

The present invention discloses a filter, comprising a shell, a cavity provided in the shell, and further comprising: a magnetic core assembly, which is mounted on the shell, with a coil conductor extending therefrom and inserted into the cavity; a transition piece, which is mounted between the shell and the magnetic core assembly, with a power connection sleeve inserted into the cavity provided thereon, and the outer wall of the power connection sleeve being conductively connected to the coil conductor; a crimping head, which is threadedly connected to the shell, and one end extending into the cavity is conductively connected to the power connection sleeve via an elastic assembly. The present invention provides a power connection sleeve, and before the magnetic core assembly is mounted on the shell, the transition piece and the magnetic suction assembly are first assembled, and the coil conductor is first welded to the power connection sleeve, and then mounted on the shell, and the power connection sleeve carries the coil conductor into the cavity, ensuring smooth installation of the coil conductor. In addition, the power connection sleeve is conductively connected to the crimping head via the elastic assembly, avoiding the problem of the coil loosening caused by the movement of the coil conductor carried by the crimping head.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a filter. Background Art

[0002] A filter is a filtering circuit composed of capacitors, inductors, and resistors. The filter can effectively filter out a specific frequency point in the power line or frequencies other than that frequency point to obtain a power signal of a specific frequency, or eliminate a power signal after a specific frequency. Existing filters can basically meet daily usage needs, but there are still some shortcomings that need to be improved.

[0003] Patent document CN218123690U discloses a filter on December 23, 2022, the announcement date, including a cavity, a cover plate, a resonant rod and a dielectric member. Among them, one end of the resonant rod is connected to the cavity, the other end of the resonant rod is spaced apart from the cover plate, and the dielectric member is arranged between the resonant rod and the cover plate; or, one end of the resonant rod is connected to the cover plate, the other end of the resonant rod is spaced apart from the resonant wall, the resonant wall is the inner wall on the side opposite to the cavity and the cover plate, and the dielectric member is arranged between the resonant rod and the resonant wall. Among them, the dielectric constant of the dielectric member is greater than the dielectric constant of air. The filter can increase the effective dielectric constant, enhance the flat plate capacitance, and reduce the resonant frequency by using a dielectric member whose dielectric constant is greater than the dielectric constant of air, thereby effectively improving the intermodulation stability and power index of the filter.

[0004] In the prior art, a magnetic coil is integrated in the filter, and one end of the coil wire is usually welded to the filter's crimping joint. When the crimping joint is connected to the outside of the wire, repeated loosening and tightening will cause one end of the coil wire to move. Especially in experimental uses of the filter, the repeated movement of the coil wire causes the coil to loosen, affecting the filter performance. Therefore, a filter is urgently needed to solve the above problem. Summary of the Invention

[0005] The object of the present invention is to provide a filter to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A filter comprises a housing with a cavity provided therein, and further comprising: a magnetic core assembly mounted on the housing, with a coil conductor extending therefrom and inserted into the cavity; a transition piece mounted between the housing and the magnetic core assembly, with a power connection sleeve inserted into the cavity, the outer wall of the power connection sleeve being in conductive contact with the coil conductor; and a crimping head threadedly connected to the housing, with one end extending into the cavity being in conductive contact with the power connection sleeve via an elastic assembly.

[0008] Preferably, the magnetic core assembly includes a bracket, a magnet and a coil. A mounting groove is provided on one end of the shell away from the crimping head. One end of the bracket is fixedly arranged in the mounting groove. The magnet is fixedly arranged in the bracket. The coil is wound around the magnet.

[0009] Preferably, a groove is provided on the inner side of the bracket, one side of the coil is embedded in the groove, and a first through-hole for the coil wire to pass through is provided on the bracket.

[0010] Preferably, a support portion is provided at one end of the bracket in the mounting groove, and the transition piece is limitedly provided inside the support portion.

[0011] Preferably, the bracket is provided with two positioning protrusions, and the transition piece is provided with positioning holes matching the positioning protrusions.

[0012] Preferably, the transition piece is provided with a second through-hole for the coil wire to pass through.

[0013] Preferably, the elastic component includes a plurality of spring pieces arranged on the inner circumference of the electrical connection sleeve, and the end of the crimping head close to the electrical connection sleeve is provided with a conductive column that abuts against each spring piece.

[0014] Preferably, a mounting hole matching the electrical connection sleeve is provided on one side of the cavity close to the mounting slot, and a third through-hole for the coil wire to pass through is provided on one side of the mounting hole.

[0015] Preferably, a coating component is provided in the electrical connection sleeve, and when the crimping head is screwed to the deepest part in the cavity, the coating component coats solder paste on the mounting hole and the third through-hole.

[0016] Preferably, the coating assembly includes a plurality of spray holes arranged on the electrical sleeve near the circumference of the mounting hole, a pressure block is movably arranged inside the electrical sleeve, the interior of the electrical sleeve on the side of the pressure block close to the spray hole is filled with solder paste, and an extrusion part is fixedly arranged on the other side of the pressure block, and the extrusion part is limited between the spring pieces.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] The filter is provided with a power connection sleeve. Before the magnetic core assembly is installed on the housing, the transition piece and the magnetic attraction assembly are first assembled, and the coil wire is first welded to the power connection sleeve and then installed on the housing. The power connection sleeve carries the coil wire into the cavity to ensure smooth installation of the coil wire. In addition, the power connection sleeve is connected to the crimping head in conductive contact through an elastic component. While ensuring conductive contact, the crimping head can be repeatedly tightened and loosened without affecting the crimping head, thereby avoiding the problem of the coil loosening caused by the movement of the coil wire carried by the crimping head.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0020] This application document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the assembly structure of the magnetic core assembly and the transition piece provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the overall side cross-sectional structure provided by an embodiment of the present invention;

[0025] Figure 4 The embodiment of the present invention provides Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 5 The embodiment of the present invention provides Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0027] Description of reference numerals:

[0028] 1. Shell; 2. Cavity; 3. Coil; 4. Coil conductor; 5. Transition piece; 6. Electrical connection sleeve; 7. Crimping joint; 8. Bracket; 9. Magnet; 10. Mounting slot; 11. Groove; 12. First through-hole; 13. Support portion; 14. Positioning protrusion; 15. Positioning hole; 16. Second through-hole; 17. Spring piece; 18. Conductive column; 19. Mounting hole; 20. Third through-hole; 21. Nozzle; 22. Pressing block; 23. Extrusion portion. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0030] See also Figure 1-5 A filter provided by an embodiment of the present invention includes a housing 1, a cavity 2 is provided in the housing 1, and further includes: a magnetic core assembly, which is installed on the housing 1, with a coil conductor 4 extending therefrom and inserted into the cavity 2; a transition piece 5, which is installed between the housing 1 and the magnetic core assembly, and is provided with a power connection sleeve 6 inserted into the cavity 2, and the outer wall of the power connection sleeve 6 is conductively connected to the coil conductor 4; a crimping head 7, which is threadedly connected to the housing 1, and one end extending into the cavity 2 is conductively connected to the power connection sleeve 6 through an elastic component.

[0031] Specifically, the shell 1 is half-wrapped with the magnetic core assembly, so that the magnetic core assembly is partially hollowed out to facilitate wire passing; the shell 1 and the magnetic core assembly form a three-dimensional design, which makes full use of the space and has a smaller volume; the transition piece 5 is in the form of a sheet and is fixed between the shell 1 and the magnetic core assembly in a clamping manner; the electrical sleeve 6 is in the form of a cylindrical tube, made of conductive material, and the end of the coil wire 4 is fixed to the outer wall of the electrical sleeve 6 by welding; there are preferably two electrical sleeves 6, which are arranged symmetrically; the crimping joint 7 is connected to the opposite side of the magnetic core assembly on the shell 1, and the crimping joint 7 is preferably a bolt, which corresponds to the electrical sleeve 6 one by one and is axially collinear; the setting of the elastic component keeps the crimping joint 7 in contact with the electrical sleeve 6 without affecting the spiral rotation of the crimping joint 7; the coil wire 4 is conductively connected to the crimping joint 7 through the electrical sleeve 6 and the elastic component; when the crimping joint 7 is crimped to the external wiring or the conductive sheet, the length of the crimping joint 7 extending into the cavity 2 is sufficient to maintain conductive contact with the electrical sleeve 6 through the elastic component. In the present technical solution, during the assembly process of the filter, before the magnetic core component is installed on the housing 1, the transition piece 5 is first assembled with the magnetic attraction component, and the coil wire 4 is first welded to the electrical sleeve 6, and then installed on the housing 1. The electrical sleeve 6 carries the coil wire 4 and is inserted into the cavity 2 to ensure smooth installation of the coil wire 4. Then, the crimping head 7 is installed, and the crimping head 7 is continuously screwed into the cavity 2 in the direction of the electrical sleeve 6 by screw connection, and then is conductively contacted and connected with the electrical sleeve 6 through the elastic component. In this way, the repeated tightening and loosening of the crimping head 7 is not affected while ensuring conductive contact, and the problem of the coil 3 being loosened due to the movement of the coil wire 4 carried by the crimping head 7 is avoided.

[0032] Compared with the prior art, a filter proposed in an embodiment of the present invention provides a power connection sleeve 6. Before the magnetic core assembly is installed on the housing 1, the transition piece 5 is first assembled with the magnetic attraction assembly, and the coil wire 4 is first welded to the power connection sleeve 6 and then installed on the housing 1. The power connection sleeve 6 carries the coil wire 4 into the cavity 2 to ensure smooth installation of the coil wire 4. In addition, the power connection sleeve 6 is conductively connected to the crimping head 7 through an elastic component. Under the condition of ensuring conductive contact, the repeated tightening and loosening of the crimping head 7 is not affected, and the problem of the coil 3 being loosened due to the movement of the coil wire 4 carried by the crimping head 7 is avoided.

[0033] As a preferred technical solution of this embodiment, the magnetic core assembly includes a bracket 8, a magnet 9 and a coil 3. A mounting groove 10 is provided on the shell 1 at one end away from the crimping head 7. One end of the bracket 8 is fixedly arranged in the mounting groove 10, the magnet 9 is fixedly arranged in the bracket 8, and the coil 3 is wound on the magnet 9. Specifically, the bracket 8 is in the shape of a rectangular frame as a whole, including a base plate placed in the mounting groove 10, corner columns arranged at the four corners of the base plate, and a baffle detachably connected to the corner columns on the opposite side of the base plate through fasteners. A copper bus is provided on the baffle, and the copper bus is connected to the coil wire 4 at the other end of the coil 3; the magnet 9 is preferably a runway-type magnetic ring with high space utilization. The runway-type magnetic ring is snapped into the bracket 8 and is just limited by the corner columns at the four corners of the bracket 8; the magnet 9 is preferably bonded to the bracket 8; two coils 3 are symmetrically wound on the magnet 9; the mounting groove 10 is recessed on the shell 1, and a part of the magnetic core assembly is embedded in the mounting groove 10, that is, one end of the bracket 8 is pressed against the innermost side of the mounting groove 10, and then fixed by bonding, welding or clamping.

[0034] As a preferred technical solution of this embodiment, a groove 11 is provided on the inner side of the bracket 8, and one side of the coil 3 is embedded in the groove 11. A first through-hole 12 is provided on the bracket 8 for the coil wire 4 to pass through. Specifically, the coil 3 is wound on the magnet 9 to form a circle of protrusions. Through the setting of the groove 11, the magnet 9 installed in the bracket 8 can embed a part of the coil 3 protruding thereon into the groove 11, and through the restriction of the inner wall of the groove 11, squeeze the coil 3 to ensure that the coil 3 is not easily loosened and deformed; the first through-hole 12 is opened on the base plate of the bracket 8.

[0035] As a preferred technical solution of this embodiment, a support portion 13 is provided at one end of the bracket 8 in the mounting groove 10, and the transition piece 5 is limited and arranged on the inner side of the support portion 13. Specifically, the support portion 13 is an extension of the corner column of the bracket 8 toward the inside of the mounting groove 10, which can support a part of the spacing space between the base plate of the bracket 8 and the inner wall of the mounting groove 10, and the sheet-like transition piece 5 is limited in the spacing space.

[0036] As a preferred technical solution of this embodiment, two positioning protrusions 14 are provided on the bracket 8, and a positioning hole 15 matching the positioning protrusion 14 is provided on the transition piece 5. Specifically, the two positioning protrusions 14 are diagonally arranged, and the positioning holes 15 can be used to accurately assemble the transition piece 5 on the magnetic core assembly.

[0037] As a preferred technical solution of this embodiment, a second through-hole 16 for the coil conductor 4 to pass through is provided on the transition piece 5. Specifically, when the transition piece 5 is assembled on the magnetic core assembly, the second through-hole 16 corresponds to the first through-hole 12. The coil conductor 4 can pass through the first through-hole 12 and the second through-hole 16 in sequence and just close to the outer wall of the power connection sleeve 6 provided on the transition piece 5. Therefore, the coil conductor 4 can be welded to the power connection sleeve 6 before the magnetic core assembly is installed on the housing 1.

[0038] As a preferred technical solution of this embodiment, the elastic component includes a plurality of spring pieces 17 arranged on the inner circumference of the electrical sleeve 6, and a conductive column 18 is provided at the end of the crimping head 7 close to the electrical sleeve 6, which abuts against each spring piece 17. Specifically, the spring piece 17 is made of a conductive material, one end of the spring piece 17 is fixedly connected to the inner wall of the electrical sleeve 6, and the other end extends axially toward the inner side of the electrical sleeve 6 and elastically tilts near the axis of the electrical sleeve 6. The tilted ends of the plurality of spring pieces 17 form an arc trajectory, and the inner diameter in the free state is smaller than the outer diameter of the conductive column 18; the outer diameter of the conductive column 18 is smaller than the inner diameter of the electrical sleeve 6; when the spring piece 17 abuts the conductive column 18, it does not affect the spiral rotation of the conductive column 18.

[0039] As a preferred technical solution of this embodiment, a mounting hole 19 matching the power sleeve 6 is provided on one side of the cavity 2 near the mounting groove 10, and a third through-hole 20 for the coil wire 4 to pass through is provided on one side of the mounting hole 19. Specifically, the power sleeve 6 extending into the cavity 2 passes through the mounting hole 19, and the coil wire 4 attached to the outer wall of the power sleeve 6 just passes through the third through-hole 20; when installing the magnetic core assembly, it is necessary to ensure that the first through-hole 12 corresponds to the third through-hole 20.

[0040] In another embodiment of the present invention, a coating component is provided in the electrical connection sleeve 6. When the crimping head 7 is tightened to the deepest part of the cavity 2, the coating component coats the mounting hole 19 and the third through-hole 20 with solder paste. Specifically, the function of the coating component to coat the solder paste is to act during the initial assembly of the filter. During the initial assembly, the crimping head 7 needs to be tightened to the deepest part of the cavity 2. The solder paste is mainly composed of alloy solder powder, flux, activator and viscosity activator thixotropic agent. At room temperature, the solder paste has a certain viscosity. When the solder paste is heated to a certain temperature, as the solvent and some additives evaporate and the alloy powder melts, the solder paste reflows to interconnect the soldered components and the pads to form permanently connected solder joints. After the coating component triggers the coating, the initially assembled filter needs to undergo a baking process to solidify the solder paste. The electrical connection sleeve 6 is then firmly and accurately fixed in the cavity 2. Similarly, the mounting hole 19 and the third through-hole 20 are also sealed.

[0041] As a preferred technical solution of this embodiment, the coating assembly includes a plurality of spray holes 21 arranged on the electrical sleeve 6 near the circumference of the mounting hole 19, a pressure block 22 is movably provided in the electrical sleeve 6, and the interior of the electrical sleeve 6 on the side of the pressure block 22 near the spray hole 21 is filled with solder paste, and an extrusion portion 23 is fixedly provided on the other side of the pressure block 22, and the extrusion portion 23 is limited between the spring pieces 17. Specifically, the pressure block 22 is in close contact with the inner wall of the electrical sleeve 6, and the extrusion portion 23 is frustum-shaped, with the larger end facing the direction outside the electrical sleeve 6, thereby just fitting with the wedge shape of the spring piece 17, and being limited by the spring piece 17 to keep the pressure block 22 fixed in position in the electrical sleeve 6 to avoid accidental extrusion of the solder paste; the range of movement of the pressure block 22 in squeezing the solder paste in the electrical sleeve 6 is such that at least the extrusion portion 23 is separated from the spring piece 17 at the maximum distance. In actual use of this technical solution, the magnetic core component and the transition piece 5 are assembled into one body and then accurately installed with the shell 1. The electrical sleeve 6 smoothly carries the coil wire 4 and is inserted into the cavity 2. Then the crimping head 7 is installed. The crimping head 7 is continuously screwed into the cavity 2 and corresponds to the electrical sleeve 6. The crimping head 7 continues to be screwed into the deepest position, that is, the crimping head 7 drives the conductive column 18 to insert into the electrical sleeve 6 to push the extrusion part 23. The extrusion part 23 pushes the pressing block 22. The pressing block 22 applies pressure to the solder paste in the electrical sleeve 6 to extrude it from the nozzle 21 and form an annular coating layer, covering the mounting hole 19 and the third through-hole 20. Subsequently, the preliminarily assembled filter is placed in a baking process for heating so that the solder paste forms a stable solder joint, that is, the production of the filter is completed. Under this production process, the position of the electrical sleeve 6 in the cavity is accurate and firm, and the sealing of the mounting hole 19 and the third through-hole 20 is guaranteed.

[0042] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A filter comprising a housing (1), wherein a cavity (2) is provided in the housing (1), characterized in that: Also includes: A magnetic core assembly is mounted on the housing (1), with a coil conductor (4) extending therefrom and inserted into the cavity (2); A transition piece (5) is installed between the housing (1) and the magnetic core assembly, and is provided with a power connection sleeve (6) inserted into the cavity (2), and the outer wall of the power connection sleeve (6) is in conductive contact with the coil conductor (4); A crimping joint (7) is threadedly connected to the housing (1), and one end of the crimping joint that extends into the cavity (2) is electrically connected to the electrical connection sleeve (6) via an elastic component; The elastic component comprises a plurality of spring pieces (17) arranged on the inner circumference of the power connection sleeve (6), and a conductive column (18) is provided at the end of the crimping head (7) close to the power connection sleeve (6) to abut against each spring piece (17); the spring piece (17) is made of conductive material, one end of the spring piece (17) is fixedly connected to the inner wall of the power connection sleeve (6), and the other end extends along the axial direction of the power connection sleeve (6) toward the inner side of the power connection sleeve (6) and elastically tilts close to the axis of the power connection sleeve (6); the tilted ends of the plurality of spring pieces (17) form an arc trajectory, and the inner diameter in the free state is smaller than the outer diameter of the conductive column (18); the outer diameter of the conductive column (18) is smaller than the inner diameter of the power connection sleeve (6); when the spring piece (17) abuts against the conductive column (18), it does not affect the spiral rotation of the conductive column (18).

2. The filter according to claim 1, wherein The magnetic core assembly comprises a bracket (8), a magnet (9) and a coil (3); a mounting groove (10) is provided on the housing (1) at one end away from the crimping joint (7); one end of the bracket (8) is fixedly disposed in the mounting groove (10); the magnet (9) is fixedly disposed in the bracket (8); and the coil (3) is wound around the magnet (9).

3. The filter according to claim 2, characterized in that A groove (11) is provided on the inner side of the bracket (8), one side of the coil (3) is embedded in the groove (11), and a first through-hole (12) for the coil wire (4) to pass through is provided on the bracket (8).

4. The filter according to claim 2, wherein A support portion (13) is provided at one end of the bracket (8) in the mounting groove (10), and the transition piece (5) is positioned inside the support portion (13).

5. The filter according to claim 2, wherein Two positioning protrusions (14) are provided on the bracket (8), and a positioning hole (15) matching the positioning protrusions (14) is provided on the transition piece (5).

6. The filter according to claim 1, wherein The transition piece (5) is provided with a second through-hole (16) for the coil conductor (4) to pass through.

7. The filter according to claim 1, wherein A mounting hole (19) matching the electrical connection sleeve (6) is provided on one side of the cavity (2) close to the mounting groove (10), and a third through-hole (20) for the coil wire (4) to pass through is provided on one side of the mounting hole (19).

8. The filter according to claim 7, characterized in that A coating component is provided in the electrical connection sleeve (6), and when the crimping joint (7) is screwed to the deepest point in the cavity (2), the coating component coats the mounting hole (19) and the third through-hole (20) with solder paste.

9. The filter according to claim 8, characterized in that The coating assembly comprises a plurality of spray holes (21) arranged on the electrical connection sleeve (6) near the circumference of the mounting hole (19); a pressing block (22) is movably arranged in the electrical connection sleeve (6); the interior of the electrical connection sleeve (6) on the side of the pressing block (22) near the spray hole (21) is filled with solder paste; an extrusion portion (23) is fixedly arranged on the other side of the pressing block (22); and the extrusion portion (23) is limited between the spring pieces (17).

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