EMC shielding structure

Abstract

The utility model provides an EMC shielding structure comprising a main body assembly, and the main body assembly comprises a metal housing, a PCBA, a grounding pole, a threaded hole, a recessed part, a connecting hole, a metal screw, a sealant, and a metal protective cover. A PCBA is arranged in the metal shell, and a grounding pole is welded to the lower portion of the front surface of the PCBA. According to the utility model, the PCBA is arranged in the metal shell, and the shell and the grounding pole on the PCBA are connected together through the metal screw, so that reliable electric connection is ensured, the original plastic shell is replaced by the metal shell, and the PCBA in the metal shell is integrally sealed through glue pouring, so that the reliability of the PCBA is improved under the condition that any electronic circuit is not changed. According to the utility model, the PCBA can be integrally wrapped inside, strict waterproof and dustproof protection is carried out on the PCBA, and after glue pouring, the whole electronic circuit part is effectively protected through the additionally arranged metal protective cover, so that the final finished product can pass a stricter EMC test standard.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification, in particular to an EMC shielding structure. Background Art

[0002] The electronic control unit (ECU) is an important component of the air purification system. It is the control center of the entire purification system. Its function and reliability will directly affect the performance and performance of the entire air purification system. In addition to its basic functional requirements, its EMC characteristics are also a technical difficulty that must be focused on;

[0003] There are many EMC standards for ECU control units, and the EMC standards for ECUs of vehicle pre-installed air purification products are more stringent, especially for some of the industry's top car brands. Their EMC standards are several levels stricter on the basis of the common EMC standards in the industry, making it impossible for many products to pass the very strict EMC standards set by those top manufacturers. In this case, the existing EMC shielding structure based on plastic shells cannot pass strict EMC tests. Therefore, it is very necessary to provide additional shielding protection structures for existing electronic circuits. For this purpose, an EMC shielding structure is proposed. Utility Model Content

[0004] In view of this, the present invention hopes to provide an EMC shielding structure to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0005] The technical solution of the embodiment of the utility model is implemented as follows: an EMC shielding structure includes a main body component, wherein the main body component includes a metal shell, a PCBA, a grounding column, a threaded hole, a recessed portion, a connecting hole, a metal screw, a sealant and a metal protective cover;

[0006] A PCBA is arranged inside the metal shell, a grounding column is welded to the lower part of the front surface of the PCBA, a threaded hole is opened at the center of the front surface of the grounding column, a recessed portion is arranged at the lower part of the front surface of the metal shell, a connecting hole is opened at the center of the inner rear wall of the recessed portion, a metal screw is bonded and connected to the inner side wall of the connecting hole, the rear part of the outer side wall of the metal screw is threadedly connected to the inner side wall of the threaded hole, the outer side of the center of the front surface of the grounding column is bonded and connected to the outer side of the center of the rear surface of the recessed portion, a sealant is arranged inside the metal shell near the outer side of the PCBA, and a metal protective cover is fixedly connected to the top of the inner side wall of the metal shell.

[0007] Further preferably, through grooves are provided on both sides of the metal shell, and a first connecting portion and a second connecting portion are respectively provided on both sides of the PCBA, and the sides of the outer walls of the first connecting portion and the second connecting portion that are close to each other are respectively fitted and connected to the inner walls of the two through grooves.

[0008] Further preferably, a plurality of positioning grooves are provided on both sides of the upper surface of the metal shell, a plurality of positioning blocks are welded on both sides of the front surface and the rear surface of the metal protective cover, and the outer side walls of the positioning blocks are fittedly connected to the inner side walls of the positioning grooves.

[0009] Further preferably, a limiting groove is provided in the middle of the lower surface of the metal protective cover, and the upper surface of the PCBA is fitted and connected to the inner top wall of the limiting groove.

[0010] Further preferably, a plurality of heat dissipation holes are formed on the upper surface of the metal protective cover.

[0011] Further preferably, a plurality of plug pins are provided in the middle of the upper surface of the metal shell.

[0012] Further preferably, a plurality of mounting plates are welded to the top of the outer side wall of the metal shell, and mounting holes are formed on both sides of the upper surfaces of the plurality of mounting plates.

[0013] Further preferably, both ends of the mounting plate on a side away from the metal housing are provided with chamfered portions.

[0014] The embodiment of the utility model has the following advantages due to the adoption of the above technical solution:

[0015] The utility model installs the PCBA into a metal shell, connects the shell and the grounding column on the PCBA with metal screws, thereby ensuring reliable electrical connection, replaces the original plastic shell with the metal shell, and performs glue-filling and sealing on the PCBA inside the metal shell as a whole, so that the PCBA can be wrapped as a whole without changing any electronic circuit, and strict waterproof and dustproof protection is provided for the PCBA. After glue-filling, the entire electronic circuit part is effectively protected by the additional metal protective cover, so that the final product can pass more stringent EMC test standards.

[0016] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is the overall structure diagram of the utility model;

[0019] Figure 2 This is a structural diagram of the metal housing and sealant of the utility model;

[0020] Figure 3 This is a structural diagram of the PCBA and grounding column of the utility model;

[0021] Figure 4 This is a structural diagram of the metal protective cover and the limiting groove of the utility model.

[0022] Figure numerals: 1. Main assembly; 11. Metal shell; 12. PCBA; 13. Grounding column; 14. Threaded hole; 15. Recessed portion; 16. Connecting hole; 17. Metal screw; 18. Sealant; 19. Metal protective cover; 20. Through groove; 21. First connecting portion; 22. Second connecting portion; 23. Positioning groove; 24. Positioning block; 25. Limiting groove; 26. Heat dissipation hole; 27. Plug pin; 28. Mounting sheet; 29. ​​Mounting hole; 30. Chamfered portion. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-Figure 4 As shown, the embodiment of the utility model provides an EMC shielding structure, including a main body component 1, the main body component 1 includes a metal shell 11, a PCBA 12, a grounding column 13, a threaded hole 14, a recessed portion 15, a connecting hole 16, a metal screw 17, a sealant 18 and a metal protective cover 19;

[0026] A PCBA 12 is arranged inside the metal shell 11, a grounding column 13 is welded to the lower part of the front surface of the PCBA 12, a threaded hole 14 is opened at the center of the front surface of the grounding column 13, a recessed portion 15 is arranged at the lower part of the front surface of the metal shell 11, a connecting hole 16 is opened at the center of the inner rear wall of the recessed portion 15, a metal screw 17 is fitted and connected to the inner side wall of the connecting hole 16, and the rear part of the outer side wall of the metal screw 17 is threadedly connected to the inner side wall of the threaded hole 14, the outer side of the center of the front surface of the grounding column 13 is fitted and connected to the outer side of the center of the rear surface of the recessed portion 15, a sealant 18 is arranged inside the metal shell 11 near the outer side of the PCBA 12, and a metal protective cover 19 is fixedly connected to the top of the inner side wall of the metal shell 11, and the sealant 18 is poured into the metal shell 11 so that the sealant 18 wraps and fixes the PCBA 12, thereby achieving a sealing and waterproof and dustproof effect.

[0027] In one embodiment, specifically: through grooves 20 are provided on both sides of the metal shell 11, and the first connecting portion 21 and the second connecting portion 22 are respectively provided on both sides of the PCBA 12. The sides of the outer walls of the first connecting portion 21 and the second connecting portion 22 that are close to each other are respectively fitted and connected to the inner walls of the two through grooves 20. The first connecting portion 21 and the second connecting portion 22 cooperate with the through grooves 20 on both sides of the metal shell 11, thereby facilitating the positioning and installation of the PCBA 12.

[0028] In one embodiment, specifically: a plurality of positioning grooves 23 are provided on both sides of the upper surface of the metal shell 11, a plurality of positioning blocks 24 are welded on both sides of the front surface and the rear surface of the metal protective cover 19, the outer wall of the positioning block 24 is fitted and connected to the inner wall of the positioning groove 23, and the positioning block 24 on the metal protective cover 19 is inserted into the positioning groove 23 on the metal shell 11, so as to position the metal protective cover 19, thereby facilitating the installation of the metal protective cover 19.

[0029] In one embodiment, specifically: a limiting groove 25 is set in the middle of the lower surface of the metal protective cover 19, and the upper surface of the PCBA 12 is fitted and connected to the inner top wall of the limiting groove 25. The limiting groove 25 limits the top of the PCBA 12, thereby increasing the firmness of the installation of the PCBA 12.

[0030] In one embodiment, specifically: a plurality of heat dissipation holes 26 are formed on the upper surface of the metal protective cover 19 , and the heat inside the metal shell 11 can be easily dissipated through the heat dissipation holes 26 .

[0031] In one embodiment, specifically: a plurality of plug pins 27 are disposed in the middle of the upper surface of the metal shell 11 , and the plug pins 27 are used to facilitate the metal shell 11 to be inserted into the installation position when being installed, so as to limit the position of the metal shell 11 .

[0032] In one embodiment, specifically: a plurality of mounting plates 28 are welded to the top of the outer wall of the metal shell 11, and mounting holes 29 are opened on both sides of the upper surface of the plurality of mounting plates 28, so that the metal shell 11 can be easily installed and fixed through the mounting holes 29 on the mounting plates 28.

[0033] In one embodiment, specifically: both ends of the mounting piece 28 away from the metal housing 11 are provided with chamfered portions 30 . The design of the chamfered portions 30 on the mounting piece 28 is helpful for positioning during installation and preventing scratches.

[0034] When the utility model is working, PCBA12 cooperates with the through slots 20 on both sides of the metal shell 11 through the first connecting parts 21 and the second connecting parts 22 on both sides thereof, and PCBA12 is installed in the metal shell 11, and the sealant 18 is poured into the inside of the metal shell 11, so that the sealant 18 wraps and fixes the PCBA12, plays a role of sealing and waterproof and dustproof, and ensures that the PCBA12 can work normally in harsh environments, and the metal protective cover 19 is fixedly installed on the upper part of the inner side wall of the metal shell 11, and the limiting groove 25 on the lower surface of the metal protective cover 19 further limits and fixes the position of the PCBA12 to prevent it from shaking and displacement during the working process. The metal protective cover 19 not only protects The function of PCBA12 is to prevent external physical damage, and also help PCBA12 dissipate heat through the heat dissipation holes 26 thereon to ensure that it works at an appropriate temperature. The grounding column 13 is welded to the lower part of the front surface of PCBA12 and is connected to the metal shell 11 through a metal screw 17 to achieve grounding of PCBA12 and the metal shell 11. This grounding method helps to conduct electromagnetic interference signals that may be generated on PCBA12 into the earth, thereby reducing interference to other electronic equipment, and protecting PCBA12 from external electromagnetic interference. The metal shell 11 itself serves as an electromagnetic shielding structure, which can effectively isolate the internal circuit from the electromagnetic field of the external environment, and further improve electromagnetic compatibility.

[0035] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An EMC shielding structure, characterized in that: The main body component (1) comprises a metal housing (11), a PCBA (12), a grounding column (13), a threaded hole (14), a recessed portion (15), a connecting hole (16), a metal screw (17), a sealant (18) and a metal protective cover (19); A PCBA (12) is arranged inside the metal shell (11), a grounding column (13) is welded to the lower part of the front surface of the PCBA (12), a threaded hole (14) is provided at the center of the front surface of the grounding column (13), a recessed portion (15) is arranged at the lower part of the front surface of the metal shell (11), a connecting hole (16) is provided at the center of the inner rear wall of the recessed portion (15), a metal screw (17) is fitted and connected to the inner wall of the connecting hole (16), the rear part of the outer wall of the metal screw (17) is threadedly connected to the inner wall of the threaded hole (14), the outer side of the center of the front surface of the grounding column (13) is fitted and connected to the outer side of the center of the rear surface of the recessed portion (15), a sealant (18) is arranged inside the metal shell (11) near the outer side of the PCBA (12), and a metal protective cover (19) is fixedly connected to the top of the inner wall of the metal shell (11).

2. An EMC shielding structure according to claim 1, characterized in that: Through slots (20) are provided on both sides of the metal shell (11), and a first connecting portion (21) and a second connecting portion (22) are provided on both sides of the PCBA (12), and the sides of the outer side walls of the first connecting portion (21) and the second connecting portion (22) that are close to each other are respectively fitted and connected to the inner side walls of the two through slots (20).

3. The EMC shielding structure according to claim 1, characterized in that: A plurality of positioning grooves (23) are provided on both sides of the upper surface of the metal shell (11), and a plurality of positioning blocks (24) are welded on both sides of the front surface and the rear surface of the metal protective cover (19), and the outer side walls of the positioning blocks (24) are fitted and connected to the inner side walls of the positioning grooves (23).

4. The EMC shielding structure according to claim 1, characterized in that: A limiting groove (25) is provided in the middle of the lower surface of the metal protective cover (19), and the upper surface of the PCBA (12) is fitted and connected to the inner top wall of the limiting groove (25).

5. An EMC shielding structure according to claim 4, characterized in that: The upper surface of the metal protective cover (19) is provided with a plurality of heat dissipation holes (26).

6. The EMC shielding structure according to claim 1, characterized in that: A plurality of plug pins (27) are provided in the middle of the upper surface of the metal shell (11).

7. An EMC shielding structure according to claim 6, characterized in that: A plurality of mounting plates (28) are welded to the top of the outer wall of the metal shell (11), and mounting holes (29) are provided on both sides of the upper surfaces of the plurality of mounting plates (28).

8. An EMC shielding structure according to claim 7, characterized in that: Chamfered portions (30) are provided at both ends of a side of the mounting piece (28) away from the metal housing (11).

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