CN113225041A

CN113225041A - T-shaped tubular filter

Info

Publication number: CN113225041A
Application number: CN202110591554.3A
Authority: CN
Inventors: 蒋忠益; 肖倩; 刘季超; 王胜刚; 李金辉; 王智会
Original assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd
Current assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-08-06

Abstract

The invention is suitable for the technical field of military filtering equipment, in particular to a T-shaped tubular filter, which comprises a tube shell, a capacitor assembly, an inductor, an input terminal and an output terminal, wherein the capacitor assembly is arranged on the tube shell; the capacitor assembly is arranged in the tube shell and comprises a circuit board and a patch capacitor electrically connected to the circuit board; the inductor is arranged in the tube shell and positioned on two sides of the capacitor assembly; the input terminal and the output terminal are respectively arranged at two ends of the tube shell, the input terminal, the capacitor assembly, the inductor and the output terminal are electrically connected to form a T-shaped filter circuit, the tube shell is internally and integrally filled with a first colloid, the insertion parts of the input terminal and the output terminal are filled and sealed in a second colloid, the second colloid is used for sealing two ends of the tube shell, and the insertion parts of the input terminal and the output terminal are of limiting structures for preventing drawing and rotating. The technical problems that the terminal is easy to rotate and fall off and the whole filter is weak in vibration resistance and impact resistance in the prior art are solved.

Description

T-shaped tubular filter

Technical Field

The invention relates to the technical field of military filtering equipment, in particular to a T-shaped tubular filter.

Background

The filter is a filter circuit consisting of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency.

The T-shaped filter is a commonly used filter, the traditional T-shaped tubular filter faces the problems of terminal rotation and terminal pulling-out, the interior can not be integrally encapsulated, the terminal is easy to loosen and rotate or even be pulled out under long-term use, and because the interior can not be integrally encapsulated, the T-shaped tubular filter is weak in vibration resistance and impact resistance, the capacitor is easy to short-circuit failure, and the reliability of the product is low.

Disclosure of Invention

The invention aims to provide a T-shaped tubular filter, and aims to solve the technical problems that a terminal is easy to rotate and fall off, and the whole filter is weak in vibration resistance and impact resistance in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a T-shaped tubular filter including:

a pipe shell;

the capacitor assembly is arranged in the tube shell and comprises a circuit board and a patch capacitor electrically connected to the circuit board; the inductor is arranged in the tube shell and positioned on two sides of the capacitor assembly;

input terminal and output terminal divide the both ends of locating the tube, electric connection forms T type filter circuit between input terminal, capacitor assembly, inductor and the output terminal wholly embedment first colloid in the tube, the portion of inserting of input terminal and output terminal embedment is in the second colloid, the second colloid is used for the both ends of sealed tube, the portion of inserting of input terminal and output terminal is for hindering drawing and pivoted limit structure.

In some embodiments of the present invention, the inductor includes a first inductor and a second inductor, the input terminal is electrically connected to a first end of the first inductor, a second end of the first inductor is respectively connected to a first end of the second inductor and a first end of the capacitor assembly, a second end of the second inductor is connected to the output terminal, and a second end of the capacitor assembly is connected to the case to realize the ground.

In some embodiments of the present invention, the input terminal and the output terminal include a pull ring portion and an insertion portion, the insertion portion includes a semi-ring portion connected to the pull ring portion and having a semi-ring shape in cross section, and a tubular portion connected to the semi-ring portion, the tubular portion further has an axial gap communicating the two ends, and a boss structure is formed at the joint of the semi-ring portion and the insertion portion.

In some embodiments of the present invention, a side of the circuit board of the capacitor assembly, where the chip capacitor is disposed, is separated from the inductor on the side by an insulating plate, and the insulating plate is provided with a first through hole for flowing a first glue.

In some embodiments of the present invention, a second through hole for the first adhesive to flow through is formed in the circuit board of the capacitor assembly.

In some embodiments of the invention, a first magnetic bead is arranged between the circuit board and the insulating board on the corresponding side, the first magnetic bead is clamped between the circuit board and the insulating board, and a gap is formed between the patch capacitor and the insulating board.

In some embodiments of the present invention, an insulating plate is also disposed between the inductor and the second colloid, and second magnetic beads are also disposed between the insulating plate and the second colloid, and the second magnetic beads are used to locate the leading positions of the input terminals and/or the output terminals.

In some embodiments of the present invention, internal threads are provided on the inner walls of both ends of the tube shell, and the internal threads are used for preventing the second colloid from falling off.

In some embodiments of the present invention, the first colloid is an a/B glue, and the second colloid is a G500 glue.

In some embodiments of the present invention, the second through hole is a notch hole provided at an edge of the circuit board.

The T-shaped tubular filter provided by the invention has the beneficial effects that: compared with the prior art, the filter provided by the invention is provided with the capacitor assembly, the chip capacitor and the circuit board are assembled together to form the capacitor assembly, the first colloid is adopted in the pipe shell to carry out integral encapsulation, the chip capacitor is wrapped in the first colloid, so that the chip capacitor cannot contact with the inner wall of the pipe shell, and the stress from the direction of the pipe shell is borne by the circuit board, so that the chip capacitor has good stability, vibration resistance and impact resistance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a T-shaped tubular filter according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a T-type tubular filter according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a capacitor assembly of a T-type tubular filter according to an embodiment of the present invention;

FIG. 4 is a schematic view of the back structure of FIG. 3;

fig. 5 is a schematic structural diagram of an insulating plate of a T-shaped tubular filter according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an input terminal/an output terminal of a T-type tubular filter according to an embodiment of the present invention.

In the figure: 1. a pipe shell; 2. an inductor; 3. a capacitive component; 4. a circuit board; 5. a chip capacitor; 6. an input terminal; 7. an output terminal; 8. a first colloid; 9. a second colloid; 10. a pull ring part; 11. a semi-ring portion; 12. a tubular portion; 13. an axial gap; 14. an insulating plate; 15. a first through hole; 16. a second through hole; 17. a surface electrode; 18. a center electrode; 19. a back electrode; 20. a first magnetic bead; 21. and a second magnetic bead.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 and 2, an embodiment of a T-type tubular filter according to the present invention includes a case 1, a capacitor assembly 3, an inductor 2, an input terminal 6, and an output terminal 7; the capacitor assembly 3 is arranged in the tube shell 1, and the capacitor assembly 3 comprises a circuit board 4 and a patch capacitor 5 electrically connected to the circuit board 4; the inductor 2 is arranged in the tube shell 1, and the inductor 2 is positioned at two sides of the capacitor component 3; input terminal 6 and output terminal 7 are located the both ends of tube shell 1 respectively, electric connection forms T type filter circuit between input terminal 6, capacitor pack 3, inductor 2 and the output terminal 7 wholly the first colloid 8 of embedment in tube shell 1, the portion of inserting of input terminal 6 and output terminal 7 embedment is in second colloid 9, second colloid 9 is used for the both ends of sealed tube shell 1, the portion of inserting of input terminal 6 and output terminal 7 is for hindering to draw and pivoted limit structure.

In this embodiment, the tube case 1 is a cylindrical case, which is preferably made of metal, the inductor 2 and the capacitor assembly 3 are disposed inside the tube case 1, the capacitor assembly 3 is formed by combining a circuit board 4 and a chip capacitor 5, the chip capacitor 5 can be a common ceramic chip capacitor 5 integrated into a PCB capacitor assembly 3, the inductors 2 are preferably two, the two inductors 2 are disposed on two sides of the capacitor assembly 3 respectively, so as to be connected into a T-type filter circuit, the capacitor assembly 3 is disposed in a central position inside the tube case 1, the two sides are respectively an inductor 2, a first colloid 8 is integrally encapsulated in the tube case 1, and each component, in particular the chip capacitor 5 is encapsulated to prevent vibration, shock and maintain stability, the chip capacitor 5 is not in contact with the inner wall of the tube case 1, the circuit board 4 is in contact with the inner wall of the tube case 1, and the circuit board 4 bears the pressure in the direction 1, more favorable deprotection paster electric capacity 5, the both ends of tube 1 are sealed through second colloid 9, input terminal 6 and output terminal 7 are established respectively to inside inserting of second colloid 9, second colloid 9 bonds with the inner wall seal of tube 1, high stability, prevent drawing and rotating, in addition in order to prevent that input terminal 6 and output terminal 7 from rotating relative second colloid 9, then set to the structural style that can hinder drawing and rotating in the portion of inserting of input terminal 6 and output terminal 7, input terminal 6 that prevents that like this can be fine and output terminal 7 takes place to draw and rotate relatively second colloid 9.

This wave filter has capacitor assembly 3, it is in the same place paster electric capacity 5 and circuit board 4 assembly, form capacitor assembly 3, and the inside of tube 1 adopts first colloid 8 to carry out the form of whole embedment, paster electric capacity 5 parcel is in first colloid 8, make paster electric capacity 5 contact the inner wall of tube 1, the stress that comes from 1 direction of tube is born by circuit board 4, make paster electric capacity 5 have fine stability, vibration resistance, shock resistance, and still be equipped with second colloid 9, a both ends for sealing tube 1, input terminal 6 and output terminal 7 have limit structure, encapsulate inside second colloid 9 through limit structure, can prevent that input terminal 6 and output terminal 7 from rotating and extracting.

As shown in fig. 2, in order to be suitably configured as a T-filter circuit with respect to the capacitor assembly 3, the inductor 2 includes a first inductor and a second inductor, the input terminal 6 is electrically connected to a first end of the first inductor, a second end of the first inductor is respectively connected to a first end of the second inductor and a first end of the capacitor assembly 3, a second end of the second inductor is connected to the output terminal 7, and a second end of the capacitor assembly 3 is connected to the case 1 to realize a ground connection. Through the above-mentioned form of electrical connection, the first inductor and the second inductor, the capacitor assembly 3, and the output terminal 7 and the input terminal 6 form a T-shaped filter circuit.

As shown in fig. 3 and 4, specifically, two surface electrodes 17 for connecting the patch capacitors 5 are provided on the front surface of the circuit board 4, one patch capacitor 5 is connected between the two surface electrodes 17, the patch capacitor 5 is connected to the circuit, then a center electrode 18 is provided at the center position of the circuit board 4, and a back electrode 19 for connecting the package 1, i.e., the ground, is provided on the back surface of the circuit board 4, which is connected in a specific embodiment, the input terminal 6 is connected to the first end of the first inductor, the second end of the first inductor is connected to the center electrode 18 of the circuit board 4, the center electrode 18 is connected to the surface electrode 17, the surface electrode 17 is connected to the back electrode 19, the back electrode 19 is connected to the package 1, so that the patch capacitor 5 is connected to the circuit and the ground is realized, and the second end of the first inductor is also connected to the first end of the second inductor, the second end of the second inductor is connected to the output terminal 7. It should be noted that two patch capacitors 5 connected in parallel may be disposed on one circuit board 4, and the two patch capacitors 5 may be simultaneously connected to the circuit, so that four surface electrodes 17 and two back electrodes 19 may be correspondingly disposed, and the two patch capacitors 5 may be connected to the circuit and grounded, respectively. The number of the patch capacitors 5 on the circuit board 4 can be set according to actual needs, and adaptive electrodes and access forms are correspondingly arranged on the circuit board 4.

As shown in fig. 6, in order to prevent the input terminal 6 and the output terminal 7 from being pulled and rotated inside the second colloid 9, in this embodiment, the input terminal 6 and the output terminal 7 include a pull ring portion 10 and an insertion portion, the insertion portion includes a semi-ring portion 11 connected with the pull ring portion 10 and having a semi-ring shape in cross section and a tubular portion 12 connected with the semi-ring portion 11, the tubular portion 12 further has an axial gap 13 communicating two ends, and a boss structure is formed at the joint of the semi-ring portion 11 and the insertion portion.

In this embodiment, the pull ring part 10 can be used for wiring, the insertion part includes a half ring part 11 and a tubular part 12, the half ring part 11 can prevent the terminal from rotating in the second colloid 9, a boss structure is provided between the tubular part 12 and the half ring part 11, that is, the tubular part 12 is larger than the annular section of the half ring part 11, the larger end section forms the boss structure, the terminal can be prevented from being pulled out, and an axial gap 13 is further provided on the tubular part 12, which can facilitate the second colloid 9 to flow in, and ensure that the inside of the tubular part 12 is filled with the second colloid 9. The terminal shape of the present embodiment can prevent the terminal from being pulled out or rotated in the second colloid 9.

As shown in fig. 1 and 5, in one embodiment of the present invention, the side of the circuit board 4 of the capacitor assembly 3 where the chip capacitor 5 is disposed is separated from the inductor 2 on the side by an insulating plate 14, and the insulating plate 14 is provided with a first through hole 15 for flowing the first colloid 8.

In this embodiment, the insulating plate 14 is used for separating the capacitor module 3 and the inductor 2 from each other, so as to reduce the electromagnetic interference effect between the capacitor module 3 and the inductor 2, the insulating plate 14 may also be a PCB, the shapes of the insulating plate 14 and the circuit board 4 of the capacitor module 3 are both adapted to the inner cross section of the tube case 1, the insulating plate is disposed in the tube case 1 along the radial direction of the tube case 1, and the edge of the insulating plate contacts with the inner wall of the tube case 1, the insulating plate 14 and the circuit board 4 can bear the pressure from the inner wall direction of the tube case 1, and the insulating plate 14 is provided with a first through hole 15, so that the first colloid 8 can flow through the insulating plate. Note that the insulating plate 14 may not be provided between the side of the circuit board 4 of the capacitor module 3 where the chip capacitor 5 is not provided and the inductor 2 on that side, because the circuit board 4 itself may be insulated.

Specifically, the first through hole 15 may be a notch hole provided at an edge of the insulating plate 14.

As shown in fig. 3 and 4, in order to allow the first glue 8 to pass through smoothly, a second through hole 16 is also formed in the circuit board 4 of the capacitor module 3 for the first glue 8 to flow through, so that the first glue 8 can fill the entire inner cavity.

As shown in fig. 1, in order to prevent the patch capacitor 5 from receiving stress from the insulating plate 14, a first magnetic bead 20 is provided between the circuit board 4 and the insulating plate 14 on the corresponding side, the first magnetic bead 20 is sandwiched between the circuit board 4 and the insulating plate 14, and a gap is provided between the patch capacitor 5 and the insulating plate 14.

In this embodiment, the first magnetic bead 20 is disposed between the circuit board 4 and the insulating board 14, which is equivalent to that the two sides of the first magnetic bead 20 respectively support the insulating board 14 and the circuit board 4, and the patch capacitor 5 is shorter than the first magnetic bead 20, so that a gap is formed between the first magnetic bead and the insulating board 14, and the patch capacitor 5 is prevented from bearing stress from the direction of the insulating board 14, thereby effectively protecting the patch capacitor 5.

An insulating plate 14 may be disposed between the inductor 2 and the second colloid 9, and a second magnetic bead 21 may be disposed between the insulating plate 14 and the second colloid 9, where the second magnetic bead 21 is used to position the leading position of the input terminal 6 and/or the leading position of the output terminal 7. That is, an insulating plate 14 may be disposed at an end of the two inductors 2 far from the capacitor assembly 3 so as to be spaced apart from the second colloid 9, and second magnetic beads 21 may be disposed between the insulating plate 14 and the second colloid 9.

Specifically, second magnetic bead 21 has been set up, second magnetic bead 21 is placed between inductor 2 and second colloid 9, and when setting up insulation board 14, second magnetic bead 21 then is placed between insulation board 14 and second colloid 9, and the length of second magnetic bead 21 has decided the filling depth of second colloid 9 and output terminal 7 or the leading-out position of input terminal 6 like this, makes the control leading-out position that can be better, will draw out the end welding and decide once successfully, improves product assembly efficiency.

First magnetic bead 20 and second magnetic bead 21 all can bear the stress that comes from the terminal direction, avoid paster electric capacity 5 to receive stress extrusion, and the stress that tests such as random vibration, high-frequency vibration, low-frequency vibration, impact produced is born by circuit board 4 and first magnetic bead 20, second magnetic bead 21 to reach the purpose of protection paster electric capacity 5. The first magnetic bead 20 and the second magnetic bead 21 not only protect the patch capacitor 5, but also improve the high-frequency characteristics of the product.

In order to prevent the second colloid 9 from falling off, internal threads are arranged on the inner walls of the two ends of the pipe shell 1, and the internal threads are used for preventing the second colloid 9 from falling off. This embodiment adopts special structural design, and cooperation shell 1 internal thread structure has the effect of drawing forth the end and preventing rotation and drop, and internal thread structure has the effect of preventing pulling out and preventing steam.

The first glue body 8 can be selected to be A/B glue, the first glue body 8 is encapsulated in the area between the two circuit boards 4 of the two capacitor assemblies 3, and the second glue body 9 can be selected to be G500 glue. The G500 adhesive begins to soften after the temperature reaches 400 ℃, and can resist high-temperature welding.

The second through hole 16 in the circuit board 4 may be a notch hole provided at the edge of the circuit board 4 for the flow of the first glue 8.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

A T-type tubular filter, comprising:

a pipe shell;

the capacitor assembly is arranged in the tube shell and comprises a circuit board and a patch capacitor electrically connected to the circuit board;

the inductor is arranged in the tube shell and positioned on two sides of the capacitor assembly;

input terminal and output terminal divide the both ends of locating the tube, electric connection forms T type filter circuit between input terminal, capacitor assembly, inductor and the output terminal wholly embedment first colloid in the tube, the portion of inserting of input terminal and output terminal embedment is in the second colloid, the second colloid is used for the both ends of sealed tube, the portion of inserting of input terminal and output terminal is for hindering drawing and pivoted limit structure.
2. A T-type tubular filter as set forth in claim 1, wherein said inductors include a first inductor and a second inductor, said input terminal is electrically connected to a first end of the first inductor, a second end of said first inductor is connected to a first end of the second inductor and a first end of the capacitor assembly, respectively, a second end of said second inductor is connected to the output terminal, and a second end of said capacitor assembly is connected to the case to realize the ground.
3. A T-type tubular filter as set forth in claim 1 or 2, wherein said input and output terminals include a pull ring portion and an insertion portion, said insertion portion includes a semi-ring portion having a semi-ring shape in cross section connected to the pull ring portion and a tubular portion connected to the semi-ring portion, said tubular portion further has an axial gap communicating both ends, and a boss structure is formed at the junction of the semi-ring portion and the insertion portion.
4. A T-type tubular filter as set forth in claim 1, wherein the side of the circuit board of the capacitor block on which the chip capacitor is provided is separated from the inductor on that side by an insulating plate having a first through-hole for the first gel to flow through.
5. A T-type tubular filter as set forth in claim 1, wherein the circuit board of said capacitor block is provided with a second through hole for the flow of the first gel.
6. The T-type tubular filter according to claim 4, wherein first magnetic beads are provided between the circuit board and an insulating plate on the opposite side, the first magnetic beads being sandwiched between the circuit board and the insulating plate, and the chip capacitors having gaps between the chip capacitors and the insulating plate.
7. A T-shaped tubular filter as set forth in claim 6, characterized in that an insulating plate is also provided between the inductor and the second colloid and second magnetic beads for positioning the lead-out positions of the input terminals and/or the output terminals are also provided between the insulating plate and the second colloid.
8. A T-type tubular filter as set forth in claim 1, wherein an internal thread for preventing the second colloid from falling off is provided on the inner walls of both ends of said tube case.
9. A T-type tubular filter as set forth in claim 1, wherein said first gel is an a/B gel and said second gel is a G500 gel.
10. A T-shaped tubular filter according to claim 5, characterized in that said second through-hole is a cut-out hole provided at the edge of the circuit board.