SMD filter inductor

Abstract

The utility model discloses an SMD (Surface Mount Device) filter inductor, which relates to the technical field of inductors and comprises a magnetic core, a coil winding, a shell with a lower end opening and a bottom sheet, the coil winding is wound on the magnetic core, a power connection terminal is led out of the coil winding, a wire passing opening is formed in the shell, and the power connection terminal penetrates through the wire passing opening to be connected with an external circuit; the shell covers the magnetic core and the coil winding through an opening in the lower end, the bottom piece is arranged at the lower end of the shell, inserting columns are arranged at the four corners of the upper end of the bottom piece, inserting grooves are formed in the four corners of the lower end of the shell, and the inserting columns are matched with the inserting grooves in an inserting mode so that the bottom piece can be fixed to the lower end of the shell. The magnetic core is prevented from falling, shaking and the like, the assembling efficiency of the inductor is further improved, the interior of the inductor can be checked only by dismantling the bottom piece when the inductor needs to be dismantled, and meanwhile, the wire passing opening formed in the shell can serve as a heat dissipation channel, so that heat generated when the inductor works can be dissipated out.

Description

TECHNICAL FIELD

[0001] The utility model relates to inductance technical field especially relates to a SMD filter inductance. BACKGROUND

[0002] SMD inductance is surface mount inductance, adopts leadless, miniaturized package, has winding type, laminated type, film type etc. Working principle is based on electromagnetic induction and energy storage release. Key parameters have inductance value, direct current resistance, saturation current, self-resonant frequency etc. Features include small size, suitable for automation production, good magnetic shielding, low direct current resistance, high saturation current and temperature stability. It is widely used in consumer electronics, automotive electronics, industrial control, communication equipment, medical equipment etc.

[0003] In the Chinese utility model patent "pin chip type common mode inductance" with the announcement number CN211208137U, including the lower end open shell, a plurality of terminals, magnetic core and wire winding, a plurality of terminals are installed on both sides of the lower end of the shell, a ring groove is arranged in the shell, the wire winding is wound around the magnetic core, the magnetic core is bonded in the ring groove and is covered by the shell, the lead-out wires at both ends of the wire winding are respectively connected with the plurality of terminals one by one.

[0004] In the above patent, the existing technology's patch type common mode inductance with large volume is redesigned into a patch type common mode inductance with small volume, which is easy to install, saves space, and the electrode after installation is more stable, and the anti-interference effect is better. In addition, the terminal faces down, the shell faces up, and there is a spacing distance in the middle, which does not completely cover and enclose the wire winding, so that the heat dissipation effect is better. Although the ring groove can improve the heat dissipation effect of the inductance, in order to fix the magnetic core in the shell after setting the ring groove, the magnetic core needs to be fixed by bonding (such as epoxy resin glue), so as to avoid the magnetic core from falling off. However, the bonding method is not only not conducive to disassembly and inspection when the inductance fails, but also needs to wait for the glue to solidify during assembly, which affects the assembly efficiency. Moreover, the glue is prone to cracking after long-term use, especially when the air is dry (such as temperature rise), which may cause the magnetic core to loosen.

[0005] Therefore, it is necessary to propose a new technical scheme to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a technical scheme capable of solving the above problems.

[0007] In order to achieve the above purpose, the utility model provides the following technical scheme: a SMD filter inductance, comprising a magnetic core, a coil winding, a shell with an open lower end and a bottom sheet.

[0008] The coil winding is wound on the magnetic core and leads out electric terminals, the shell is provided with wire passing ports, and the electric terminals pass through the wire passing ports and are connected with external circuits;

[0009] The shell is arranged outside the magnetic core and the coil winding through the lower end opening cover, the bottom sheet is arranged at the lower end of the shell, and the bottom sheet is provided with inserting columns at four corners of the upper end, the shell is provided with inserting grooves at four corners of the lower end, and the inserting columns and the inserting grooves are inserted and matched to fix the bottom sheet to the lower end of the shell.

[0010] As a further scheme of the utility model, a plurality of damping rings are sleeved on the inserting columns.

[0011] The diameter of the inserting column is smaller than the diameter of the inserting groove, the diameter of the damping ring is slightly larger than the diameter of the inserting groove, and the damping ring is deformed by extrusion and interacts with the inner wall of the inserting groove when the inserting column and the inserting groove are inserted.

[0012] As a further scheme of the utility model, limiting blocks are arranged at two sides of the upper end of the bottom sheet, limiting grooves are arranged on the limiting blocks, and the two sides of the magnetic core are located in the limiting grooves.

[0013] The limiting grooves are in arc-shaped structures matched with the arc of the magnetic core.

[0014] As a further scheme of the utility model, the two sides of the bottom sheet are provided with push pressing parts extending outward and protruding from the side surface of the shell.

[0015] As a further scheme of the utility model, the push pressing part is provided with a notch formed downward and inclined to the shell.

[0016] As a further scheme of the utility model, the shell is further provided with a winding part at the side end, the electric terminal is wound on the winding part after passing through the wire passing port, and the lowest point of the electric terminal is lower than the lowest point of the bottom sheet after winding.

[0017] As a further scheme of the utility model, the winding part is provided with a baffle outside, and the baffle is used for preventing the electric terminal wound on the winding part from loosening.

[0018] Compared with the prior art, the beneficial effects of the technical scheme are that the shell can provide electromagnetic shielding for the inductor coil composed of the magnetic core and the coil winding, thereby reducing external interference when the inductor coil is applied in a circuit, improving the effect of the inductor coil in the circuit, and the open lower end of the shell is beneficial to the assembly of the inductor, and after the shell is assembled, the plug-in columns at the four corners of the upper end of the bottom plate are plugged into the plug-in slots at the four corners of the lower end of the shell in a corresponding plug-in manner to fix the bottom plate, the bottom plate supports the magnetic core in the shell, prevents the magnetic core from falling off or shaking, and improves the assembly efficiency of the inductor, and when disassembly is required, the inside of the inductor can be checked by only removing the bottom plate, meanwhile, the wire passing hole is provided on the shell for the passing of the electrical terminal, the wire passing hole can also be used as a heat dissipation channel, and the wire passing hole is upwardly arranged, which is more beneficial to the heat generated during the operation of the inductor.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0021] Figure 1 is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 is a schematic diagram of the explosion structure of the present application;

[0023] Figure 3 is a schematic diagram of the structure when the magnetic core and the coil winding are located on the bottom plate of the present application;

[0024] Figure 4 is a schematic diagram of the shell structure of the present application;

[0025] The corresponding label explanations in the drawings are as follows:

[0026] 1, magnetic core; 2, coil winding; 21, electrical terminal; 3, shell; 31, plug-in slot; 32, wire passing hole; 33, winding part; 34, baffle; 4, bottom plate; 41, plug-in column; 42, damping ring; 43, limiting block; 44, limiting slot; 45, push part; 46, notch. DETAILED DESCRIPTION

[0027] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0028] Please refer to Figures 1-4 A SMD filter inductor, comprising a magnetic core 1, a coil winding 2, a shell 3 with a lower end opening and a bottom sheet 4;

[0029] The coil winding 2 is wound on the magnetic core 1 and has a power terminal 21 led out, and the shell 3 is provided with a wire passing hole 32, and the power terminal 21 passes through the wire passing hole 32 and is connected with an external circuit;

[0030] The shell 3 is arranged outside the magnetic core 1 and the coil winding 2 through the lower end opening, the bottom sheet 4 is arranged at the lower end of the shell 3, and the bottom sheet 4 is provided with a plug-in column 41 at each of the four corners of the upper end, and the shell 3 is provided with a plug-in groove 31 at each of the four corners of the lower end, and the plug-in column 41 and the plug-in groove 31 are plug-in matched to fix the bottom sheet 4 at the lower end of the shell 3.

[0031] In use, the shell 3 can provide electromagnetic shielding for the inductor coil composed of the magnetic core 1 and the coil winding 2, thereby reducing the external interference of the inductor coil in the circuit and improving the effect of the inductor coil in the circuit. The shell 3 with the lower end opening is conducive to the assembly of the inductor, and after the shell 3 is assembled, the plug-in column 41 at each of the four corners of the upper end of the bottom sheet 4 is plug-in matched with the plug-in groove 31 at each of the four corners of the lower end of the shell 3 to fix the bottom sheet 4. The bottom sheet 4 plays a supporting role for the magnetic core 1 inside the shell 3, preventing the magnetic core 1 from falling off or shaking, and improving the assembly efficiency of the inductor. When disassembly is needed, only the bottom sheet needs to be removed to check the inside of the inductor. At the same time, the wire passing hole 32 is provided on the shell 3 for the power terminal 21 to pass through, and the wire passing hole 32 can also be used as a heat dissipation channel, and the wire passing hole 32 is arranged upward, which is more conducive to the dissipation of heat generated during the operation of the inductor.

[0032] In the present embodiment, further plug-in columns 41 are provided with a plurality of damping rings 42;

[0033] The diameter of the plug-in column 41 is smaller than the diameter of the plug-in groove 31, and the diameter of the damping ring 42 is slightly larger than the diameter of the plug-in groove 31. When the plug-in column 41 is plug-in matched with the plug-in groove 31, the damping ring 42 is extruded to deform and generate a mutual force with the inner wall of the plug-in groove 31.

[0034] Specifically, as Figure 3 and Figure 4As shown, when the bottom plate 4 is assembled with the shell 3, the damping ring 42 sleeved on the insertion column 41 is extruded and deformed during the insertion process, so that it forms an interaction force with the inner wall of the insertion slot 31 by the elastic deformation force inside the insertion slot 31, thereby improving the fastening between the insertion column 41 and the insertion slot 31 to avoid the easy separation of the bottom plate 4 from the shell 3.

[0035] Preferably, the damping ring 42 is made of silica gel material.

[0036] Further, the bottom plate 4 is provided with a limiting block 43 on both sides of the upper end, a limiting slot 44 is formed on the limiting block 43, and the two sides of the magnetic core 1 are located in the limiting slot 44.

[0037] Preferably, the limiting slot 44 is in an arc structure matching the curvature of the magnetic core 1.

[0038] Specifically, after the bottom plate 4 is fixed with the shell 3, the limiting slot 44 formed on the limiting block 43 corresponds to the magnetic core 1, so as to cover the magnetic core 1, thereby limiting the position of the magnetic core 1 to avoid displacement of the magnetic core 1 during transfer and SMD mounting, thereby improving the stability of the inductor. The arc structure of the limiting slot 44 can better fit the magnetic core 1 and improve the limiting effect.

[0039] Further, the bottom plate 4 is provided with a pushing part 45 extending outwardly and protruding from the side surface of the shell 3. The pushing part 45 on both sides can facilitate the disassembly of the bottom plate 4, that is, the operator can use the pushing part 45 as a force point to push the bottom plate 4 to separate the insertion column 41 from the insertion slot 31.

[0040] Preferably, the pushing part 45 is provided with a notch 46 formed downwardly and obliquely towards the shell 3. The notch 46 can make the operator better exert force when pushing, and can also avoid loosening when pushing.

[0041] In addition, the shell 3 is also provided with a winding part 33, and the electrical terminal 21 is wound on the winding part 33 after passing through the wire port 32, and the lowest point of the electrical terminal 21 is lower than the lowest point of the bottom plate 4 after winding.

[0042] Specifically, the electrical terminal 21 can be wound on the winding part 33 to facilitate the fixation of the electrical terminal 21. At this time, the bottom of the electrical terminal 21 is at the lowest point of the inductor, so that the electrical terminal 21 can contact the electrical point at the upper end of the circuit during SMD mounting and be fixed by welding in the subsequent welding process.

[0043] Further, the winding part 33 is provided with a baffle 34 outside, and the baffle 34 is used to prevent the electrical terminal 21 wound on the winding part 33 from loosening. The baffle 34 limits the position of the electrical terminal 21 after winding to avoid the electrical terminal 21 from being separated from the winding part 33, thereby preventing poor contact and improving the stability of the inductor.

[0044] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The presently disclosed embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No feature of the application is to be construed as limiting the application to a specific embodiment unless otherwise explicitly claimed.

Claims

1. An SMD filter inductor, characterized by, The core (1), the coil winding (2), the shell (3) with the lower end opening and the bottom sheet (4) are included. The coil winding (2) is wound on the core (1) and has the electrical connection terminal (21) drawn out, the shell (3) is provided with the wire passing opening (32), and the electrical connection terminal (21) is connected with the external circuit through the wire passing opening (32). The shell (3) is arranged outside the core (1) and the coil winding (2) through the lower end opening, the bottom sheet (4) is arranged at the lower end of the shell (3), and the plug-in column (41) is arranged at the upper end of the bottom sheet (4), the plug-in groove (31) is arranged at the lower end of the shell (3), and the plug-in column (41) is matched with the plug-in groove (31) to fix the bottom sheet (4) to the lower end of the shell (3).

2. The SMD filter inductor according to claim 1, characterized in that The plug-in column (41) is provided with a plurality of damping rings (42). The diameter of the plug-in column (41) is smaller than the diameter of the plug-in groove (31), the diameter of the damping ring (42) is slightly larger than the diameter of the plug-in groove (31), and the damping ring (42) is extruded to generate deformation and interact with the inner wall of the plug-in groove (31) when the plug-in column (41) is plugged into the plug-in groove (31).

3. The SMD filter inductor according to claim 1, characterized in that The limiting block (43) is arranged at the both sides of the upper end of the bottom sheet (4), the limiting slot (44) is arranged on the limiting block (43), and the both sides of the core (1) are arranged in the limiting slot (44). The limiting slot (44) is in the arc structure matched with the arc of the core (1).

4. The SMD filter inductor according to claim 2, characterized in that The push pressing part (45) is arranged at the both sides of the bottom sheet (4) and extends outward to protrude from the side of the shell (3).

5. The SMD filter inductor according to claim 4, characterized in that The notch (46) is arranged on the push pressing part (45) and is inclined downward to the shell (3).

6. The SMD filter inductor of claim 1, wherein, The winding part (33) is arranged at the side end of the shell (3), the electrical connection terminal (21) is wound on the winding part (33) after passing through the wire passing opening (32), and the lowest point of the electrical connection terminal (21) is lower than the lowest point of the bottom sheet (4).

7. The SMD filter inductor according to claim 6, characterized in that The baffle (34) is arranged outside the winding part (33) and is used for preventing the electrical connection terminal (21) wound on the winding part (33) from loosening.

Images