Integrated pressed inductor and production process thereof

Abstract

The invention relates to the technical field of inductors, in particular to an integrated pressed inductor and a production process thereof. When the E-shaped magnetic core and the I-shaped magnetic core are fixed into a whole, a containing cavity is formed in the E-shaped magnetic core and the I-shaped magnetic core, the E-shaped magnetic core comprises a bottom plate and a middle column arranged on the bottom plate, the bottom plate is provided with an annular groove, and the annular groove surrounds the peripheral face of the lower portion of the middle column. The coil is arranged in the containing cavity and comprises a winding part formed by winding a wire with an insulating layer and a leading-out part led out from the winding part, the surface of the leading-out part is exposed out of the surface of the forming body, the leading-out part comprises two terminals, and the two terminals extend in opposite directions on the two sides of the coil; the coil is hollow and is sleeved on the peripheral surface of the middle column, and the adhesive is arranged in the groove and at the joint of the I-shaped magnetic core and the E-shaped magnetic core, so that the coil is prevented from falling off, the service life of the coil is prolonged, and the coil with a larger wire diameter is favorably used, so that lower direct-current impedance is achieved, and the effect of stabilizing current is better.

Description

Technical Field

[0001] The invention belongs to the technical field of inductors, and in particular relates to an integrated pressed inductor and a production process thereof. Background Art

[0002] Inductors are an electronic component widely used in various electronic circuits. Together with resistors and capacitors, they are known as the three major passive components. They have the properties of passing DC and blocking AC, and can isolate AC signals, oscillate, choke, tune, and select frequencies.

[0003] Power inductors are generally used in DC-DC circuits to stabilize current and store energy. When a power inductor is required to pass a larger current while having a smaller volume, an integrated pressed inductor and its production process are required to solve the above problems. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an integrated pressed inductor and a production process thereof to solve the problems in the existing market raised in the above background technology.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] An integrated pressed inductor and a production process thereof, characterized by comprising:

[0007] I-type core;

[0008] The E-type magnetic core is fixed as a whole with the I-type magnetic core, and a receiving cavity is formed in the E-type magnetic core and the I-type magnetic core. The E-type magnetic core includes a bottom plate and a middle column arranged on the bottom plate, and the bottom plate is provided with an annular groove, and the annular groove surrounds the outer peripheral surface of the lower part of the middle column;

[0009] The coil is arranged in the accommodating cavity, and includes a winding portion formed by winding a wire having an insulating layer, and a lead portion led out from the winding portion, the surface of the lead portion is exposed to the surface of the above-mentioned molded body, and the lead portion is two terminals, and the two terminals extend in opposite directions on both sides of the coil;

[0010] Adhesive is arranged in the groove and at the connection between the I-shaped magnetic core and the E-shaped magnetic core.

[0011] Through the above technical solution, the coil is wound into a hollow shape, the lead-out part is stripped of paint, and is sleeved on the outer peripheral surface of the central column. The adhesive is beneficial for connecting and fixing the coil to the E-type magnetic core, preventing the coil from falling off, and extending the service life. It is also beneficial for using a coil with a larger wire diameter to achieve a lower DC impedance and pass a larger current. The current passing is generally greater than 10A, and the current stabilization and energy storage effects are better.

[0012] As a preferred solution of the present invention, the annular groove is matched with the coil, and a connecting block is provided on the inner side wall of the annular groove, and the connecting block is made of glass fiber.

[0013] Through the above technical scheme, the annular groove is convenient for further fixing the coil and also convenient for installing the coil to avoid the position displacement or falling off of the coil. The glass fiber has good insulation and heat resistance. The glass fiber is high-strength glass fiber. The high-strength glass fiber is composed of short fibers. Since there is a certain gap between the fibers, the gap will be compressed when squeezed. When the coil is mounted on the center column, the bottom outer peripheral surface of the coil is fitted with the annular groove through the glass fiber, which is convenient for improving the stability between the coil and the inductor.

[0014] As a preferred embodiment of the present invention, the adhesive is a mixed adhesive of epoxy resin and polyurethane-modified epoxy resin and / or a polyurethane adhesive.

[0015] As a preferred embodiment of the present invention, the coil is hollow and sleeved on the outer peripheral surface of the middle column, and the diameter of the middle column is 0.01-0.2 mm smaller than the inner diameter of the coil.

[0016] As a preferred solution of the present invention, notches are provided on both sides of the E-shaped magnetic core for accommodating the lead-out parts.

[0017] As a preferred solution of the present invention, side panels are provided on both sides of the bottom panel, the side panels are vertically connected to the bottom panel, the side panels and the bottom panel are integrally formed, and the side panels are consistent in height with the center column.

[0018] The integrated pressed inductor preparation process includes the following steps:

[0019] S1. Wind a hollow coil, the coil is a flat coil with a thickness of 0.01-0.1 mm, and flatten the two lead parts of the coil;

[0020] S2, removing the insulating layer on the outer peripheral surface of the lead-out part of the coil, and tinning the fracture to form an electrode by infiltration;

[0021] S3, forming an E-type magnetic core by mold pressing and sintering;

[0022] S4. Place some glass fibers on the inner wall of the annular groove of the E-shaped magnetic core, and inject liquid glue on the bottom surface of the inner wall of the annular groove;

[0023] S5, insert the coil into the outer peripheral surface of the middle column, extend the lead-out part of the coil to the outer peripheral surface of the E-shaped magnetic body, adhere the lower end surface of the coil with glue, and connect the lower outer peripheral surface of the coil with the glass fiber;

[0024] S6. Inject glue into the upper end surface of the middle column of the E-shaped magnetic core and the upper end surfaces of the two side plates;

[0025] S7, assembling and pressing the I-type magnetic core and the E-type magnetic core into one;

[0026] S8, bake the integrally pressed inductor in S7 at 100℃~180℃ for 5-60min;

[0027] S9. Bend the lead-out part upward to the upper end surface of the inductor and apply glue on the lead-out part;

[0028] S10. Bake the inductor in S9 at 100℃~180℃ for 5-10min.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The coil is wound into a hollow shape, the lead-out part is peeled off and mounted on the outer surface of the center column. The adhesive is beneficial for connecting and fixing the coil to the E-type magnetic core to prevent the coil from falling off and prolonging the service life. It is also beneficial for using a coil with a larger wire diameter to achieve a lower DC impedance and pass a larger current. The current passing is generally greater than 10A, which has better current stability and energy storage effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the integrated pressed inductor of the present invention;

[0033] Figure 2 For the present invention Figure 1 The structural diagram in ;

[0034] Figure 3 For the present invention Figure 1 Schematic diagram of the E-type magnetic core structure;

[0035] Figure 4 For the present invention Figure 1 Schematic diagram of the coil structure. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides the following embodiments:

[0038] Embodiment 1:

[0039] An integrated pressed inductor and a production process thereof, characterized by comprising:

[0040] I-type magnetic core 1;

[0041] When the E-type magnetic core 2 is fixed as a whole with the I-type magnetic core 1, a receiving cavity 3 is formed in the E-type magnetic core 2 and the I-type magnetic core 1. The E-type magnetic core 2 includes a bottom plate 21 and a middle column 22 arranged on the bottom plate 21. The bottom plate 21 is provided with an annular groove 23. The annular groove 23 surrounds the outer peripheral surface of the lower part of the middle column 22.

[0042] The coil 4 is arranged in the accommodating cavity 3, and includes a winding portion 41 formed by winding a wire having an insulating layer 43, and a lead portion 42 led out from the winding portion 41, the surface of the lead portion 42 is exposed to the surface of the above-mentioned molded body, and the lead portion 42 is two terminals, and the two terminals extend in opposite directions on both sides of the coil 4. The coil 4 is hollow and sleeved on the outer peripheral surface of the middle column 22, and the diameter of the middle column 22 is 0.01-0.2mm smaller than the inner diameter of the coil 4;

[0043] The adhesive 5 is disposed in the groove and at the connection between the I-type magnetic core 1 and the E-type magnetic core 2 .

[0044] As a further improvement of the present invention, the annular groove 23 is adapted to the coil 4, and a connecting block is provided on the inner wall of the annular groove 23. The connecting block is made of glass fiber. The annular groove 23 is convenient for further fixing the coil 4 and for installing the coil 4 to prevent the coil 4 from being displaced or falling off. The glass fiber has good insulation and heat resistance. The glass fiber is high-strength glass fiber, which is composed of short fibers. Since there is a certain gap between the fibers, the gap will be compressed when squeezed. When the coil 4 is sleeved on the middle column 22, the bottom outer peripheral surface of the coil 4 is fitted with the annular groove 23 through the glass fiber, which is convenient for improving the stability between the coil 4 and the inductor.

[0045] As a further improvement of the present invention, the adhesive 5 is a mixed adhesive 5 of epoxy resin and polyurethane-modified epoxy resin and / or a polyurethane adhesive 5 .

[0046] As a further improvement of the present invention, notches are provided on both sides of the E-shaped magnetic core 2 for accommodating the lead-out portion 42 .

[0047] As a further improvement of the present invention, side panels are provided on both sides of the bottom plate 21, the side panels are vertically connected to the bottom plate 21, the side panels and the bottom plate 21 are integrally formed, the side panels are at the same height as the center column 22, and the side panels close to the center column 22 are arc-shaped.

[0048] Embodiment 2:

[0049] The integrated pressed inductor preparation process includes the following steps:

[0050] S1, winding a hollow coil 4, the coil 4 is a flat coil 4 with a thickness of 0.01-0.1 mm, and flattening the two lead-out parts 42 of the coil 4;

[0051] S2, removing the insulating layer 43 on the outer peripheral surface of the lead-out portion 42 of the coil 4, and tinning the fracture to form an electrode by infiltration;

[0052] S3, forming an E-shaped magnetic core 2 by pressing and sintering a mold;

[0053] S4, placing some glass fibers on the inner wall of the annular groove 23 of the E-shaped magnetic core 2, and injecting liquid glue on the bottom surface of the inner wall of the annular groove 23;

[0054] S5, insert the coil 4 into the outer peripheral surface of the middle column 22, the lead-out portion 42 of the coil 4 extends to the E-shaped magnetic outer peripheral surface, the lower end surface of the coil 4 is adhered with glue, and the lower outer peripheral surface of the coil 4 is connected with the glass fiber;

[0055] S6. Inject glue into the upper end surface of the middle column 22 of the E-shaped magnetic core 2 and the upper end surfaces of the two side plates;

[0056] S7, assembling and pressing the I-type magnetic core 1 and the E-type magnetic core 2 into one;

[0057] S8, bake the integrally pressed inductor in S7 at 100℃~180℃ for 5-60min;

[0058] S9, bend the lead portion 42 upward to the upper end surface of the inductor, and apply glue on the lead portion 42;

[0059] S10. Bake the inductor in S9 at 100℃~180℃ for 5-10min.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] The coil 4 is wound into a hollow shape, the lead-out part 42 is stripped of paint, and is sleeved on the outer peripheral surface of the middle column 22. The adhesive 5 is beneficial to connect and fix the coil 4 to the E-type magnetic core 2 to prevent the coil 4 from falling off and prolonging the service life. It is also beneficial to use a coil 4 with a larger wire diameter to achieve a lower DC impedance and pass a larger current. The current passed can be greater than 10A, and the current stabilization and energy storage effects are better, which reduces the complex production process and technology and can better serve and develop the market.

[0062] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. One-piece pressed inductor, characterized by ,include: I-type magnetic core (1); The E-type magnetic core (2) is fixed as a whole with the I-type magnetic core (1), and a receiving cavity (3) is formed in the E-type magnetic core (2) and the I-type magnetic core (1). The E-type magnetic core (2) comprises a bottom plate (21) and a middle column (22) arranged on the bottom plate (21), and the bottom plate (21) is provided with an annular groove (23), and the annular groove (23) surrounds the outer peripheral surface of the lower part of the middle column (22); The coil (4) is arranged in the accommodating cavity (3), and comprises a winding portion (41) formed by winding a conductive wire having an insulating layer (43), and a lead portion (42) led out from the winding portion (41), wherein a surface of the lead portion (42) is exposed to a surface of the molded body, and the lead portion (42) is two terminals, and the two terminals extend in opposite directions on both sides of the coil (4); Adhesive (5) is arranged in the groove and at the connection between the I-shaped magnetic core (1) and the E-shaped magnetic core (2).

2. The integrated pressed inductor according to claim 1, characterized in that: The annular groove (23) is matched with the coil (4), and a connecting block is provided on the inner side wall of the annular groove (23), and the connecting block is made of glass fiber.

3. The integrated pressed inductor according to claim 2, characterized in that: The adhesive (5) is a mixed adhesive (5) of epoxy resin and polyurethane-modified epoxy resin and / or a polyurethane adhesive (5).

4. The integrated pressed inductor according to claim 3, characterized in that: The coil (4) is hollow and sleeved on the outer peripheral surface of the middle column (22), and the diameter of the middle column (22) is 0.01-0.1 mm smaller than the inner diameter of the coil (4).

5. The integrated pressed inductor according to claim 4, characterized in that: Notches are provided on both sides of the E-shaped magnetic core (2) for accommodating the lead-out portion (42).

6. The integrated pressed inductor according to claim 5, characterized in that: Side plates are arranged on both sides of the bottom plate (21), the side plates are vertically connected to the bottom plate (21), the side plates and the bottom plate (21) are integrally formed, and the side plates are at the same height as the center column (22).

7. A process for preparing an integrated pressed inductor, according to the integrated pressed inductor of claims 1-6, characterized in that: The steps include: S1, winding a hollow coil (4), the coil (4) being a flat coil (4) with a thickness of 0.01-0.1 mm, and flattening two lead-out portions (42) of the coil (4); S2, removing the insulating layer (43) on the outer peripheral surface of the lead-out portion (42) of the coil (4), and applying tin to the fracture by infiltration to form an electrode; S3, forming an E-shaped magnetic core (2) by pressing and sintering the mold; S4. Place a number of glass fibers into the inner wall of the annular groove (23) of the E-shaped magnetic core (2), and inject liquid glue into the bottom surface of the inner wall of the annular groove (23); S5. Insert the coil (4) into the outer peripheral surface of the middle column (22), extend the lead-out portion (42) of the coil (4) to the E-shaped magnetic outer peripheral surface, adhere the lower end surface of the coil (4) with glue, and connect the lower outer peripheral surface of the coil (4) with the glass fiber. S6. Inject glue into the upper end surface of the middle column (22) of the E-shaped magnetic core (2) and the upper end surfaces of the two side plates; S7, assembling and pressing the I-type magnetic core (1) and the E-type magnetic core (2) into one body; S8, bake the integrally pressed inductor in S7 at 100℃~180℃ for 5-60min; S9, bend the lead-out portion (42) upward to the upper end surface of the inductor, and apply glue on the lead-out portion (42); S10. Bake the inductor in S9 at 100℃~180℃ for 5-10min.

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