Cleaning-resistant filtering connector

Abstract

The invention relates to the technical field of filtering connectors, in particular to a cleaning-resistant filtering connector, which solves the problems that cleaning fluid is easy to permeate and silver migration short circuit is easy to occur to a silver electrode of a plate-type capacitor due to the fact that a potting structure of the connector is not tightly sealed in the prior art, and comprises a shell, an insulator and the plate-type capacitor are arranged in the shell, a contact piece is arranged in the insulator and the plate-type capacitor in a penetrating manner, a heated and cured hot melt adhesive block is arranged between the contact piece and the shell, and the hot melt adhesive block is positioned between the insulator and the plate-type capacitor; and the plate-type capacitor is connected with the shell through a grounding spring and is connected with the contact piece through an elastic piece. The invention has the beneficial effects that the hot melt adhesive block is tightly bonded with the contact piece, the shell and the insulator after being heated and cured, the rubber ring seal between the shell and the insulator and the interference fit seal between the sealing body and the contact piece as well as the shell are combined to form a multi-seal structure, so that the permeation channel of cleaning fluid is fundamentally blocked, and the cleaning efficiency is improved. And faults caused by cleaning liquid residues after cleaning are effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of filter connector technology, and in particular to a cleanable filter connector. Background Technology

[0002] Filtered connectors, by adding components such as plate capacitors inside ordinary electrical connectors, combine the signal and power transmission functions of traditional electrical connectors with excellent electromagnetic interference resistance. Using filtered connectors is one of the effective ways to solve system electromagnetic compatibility problems. A typical structure of existing filtered connectors usually includes a housing, insulator, plate capacitor, contacts, springs, rubber rings, and grounding springs. The capacitor and contacts achieve flexible contact through springs, and the capacitor and housing are connected through grounding springs to achieve filtering and conduction. During assembly, the plate capacitor, contacts, and springs are generally assembled first. Epoxy resin is poured into the potting area to initially fix the contacts. Then, the insulator and plate capacitor assembly are installed into the housing. After installing the grounding spring, a second potting resin is applied at another potting area to complete the fixation.

[0003] With the increasing integration of electronic equipment, the application scenarios of filter connectors are becoming more complex, and structural improvements for different signal transmission requirements are constantly emerging. For example, patent CN120674874A discloses a filter connector for mixed high- and low-speed signals. This connector includes a housing with a plate capacitor inside, on which several capacitor holes are distributed. An insulating sleeve passes through some of the capacitor holes, and a high-speed contact passes through the insulating sleeve. A spring passes through the other capacitor holes, and a low-speed contact passes through the spring. A grounding spring is set between the plate capacitor and the inner wall of the housing to achieve filtering and conduction of the low-speed contact, the plate capacitor, and the housing. Insulating structures are set in the inner cavities of the housing on both sides of the plate capacitor. The insulating structures include an insulator and a potting compound. This prior art solves the problem of synergistic operation between electromagnetic compatibility test pass rate and normal transmission of high-speed signals in mixed high- and low-speed signal scenarios by filtering low-speed and power signals and reducing parasitic capacitance of high-speed signals. However, its structural design focuses on optimizing signal transmission performance and does not consider the impact of the cleaning process on the reliability of the connector.

[0004] In the mass production of equipment, to improve production efficiency, water-based PCB automatic cleaning technology has gradually replaced traditional manual cleaning technology and become the industry mainstream. However, existing technology products, including the filter connectors disclosed in the aforementioned patent application, cannot meet the cleaning resistance requirements due to inherent defects in their structural design, leading to frequent quality problems after cleaning. The specific defects and hazards are as follows: First, the potting structure has sealing risks. The epoxy potting method used in existing filter connectors cannot guarantee that the potting compound is completely filled. During cleaning, the cleaning fluid can easily seep into the connector through the gap between the insulator and the contact. Second, the shell and insulator adopt a clearance fit design. The assembly gap between the two allows the cleaning fluid to seep into the connector through the assembly gap. After cleaning, the product is not easy to dry. The cleaning fluid remaining inside the connector after drying will come into contact with the board capacitors. The board capacitors of existing filter connectors use silver electrodes or palladium-silver alloy electrodes. Silver electrodes have high activity. When the seeping cleaning fluid comes into contact with the board capacitors, it can easily cause silver migration short circuit faults when the product is powered on, which greatly affects the quality of the equipment. In addition, some existing filter connectors require the coating of silicone rubber on both ends of the plate capacitor to prevent the potting compound from coming into direct contact with the capacitor. However, the curing cycle of silicone rubber is long, which not only prolongs the product assembly cycle, but also cannot fundamentally block the penetration path of cleaning fluid. Summary of the Invention

[0005] This invention proposes a washable filter connector, which solves the problems in the prior art where cleaning fluid easily seeps in due to poor sealing of the connector potting structure, and silver migration short circuits easily occur on the silver electrodes of plate capacitors.

[0006] The technical solution of this invention is implemented as follows:

[0007] A washable filter connector includes a housing, an insulator and a plate capacitor installed inside the housing, and contacts passing through the insulator and plate capacitor. A heat-curing hot melt adhesive block is placed between the contacts and the housing, positioned between the insulator and the plate capacitor. The plate capacitor is connected to the housing via a grounding spring and to the contacts via a spring contact. The connection between the plate capacitor and the housing via the grounding spring enables filtering and conduction. After the hot melt adhesive block is inserted into the connector, it is heat-cured and bonded to the contacts, housing, and insulator, thus fixing the contacts, fixing the insulator, and providing a waterproof seal for the connector.

[0008] The grounding spring includes an integrally connected grounding spring sidewall and grounding spring bottomwall. The grounding spring sidewall is provided with internal spring teeth and external spring teeth. The internal spring teeth contact the plate capacitor, and the external spring teeth contact the housing. The internal and external spring teeth can ensure better contact with both the housing and the plate capacitor.

[0009] The internal spring teeth are arranged in a circumferential array on the side wall of the grounding spring, and the internal spring teeth extend inward along the axis of the grounding spring.

[0010] The ends of the internal spring teeth face the bottom wall of the grounding spring. This prevents the ends of the internal spring teeth from contacting the end face of the plate capacitor, which is beneficial for the assembly of the plate capacitor and the grounding spring.

[0011] The external spring teeth are arranged in a circumferential array on the side wall of the grounding spring, and the external spring teeth extend outward along the radial direction of the grounding spring.

[0012] The plate capacitor has an inner hole, and the bottom wall of the grounding spring has an opening corresponding to the inner hole of the plate capacitor. Electromagnetic waves are shielded from propagating from the mating end to the rear end of the connector, achieving a 360-degree shielding effect.

[0013] The inner wall of the plate capacitor is sequentially provided with a nickel layer and a gold plating layer. The gold-plated plate capacitor employs a process where a nickel base is applied to the inner wall of the plate capacitor before gold plating. Because gold ions have relatively low activity, migration and potential malfunctions can be avoided.

[0014] The insulator has a step on its end face, and a first side protrusion and a second side protrusion on the side of the step. The first side protrusion and the second side protrusion cooperate with the housing to limit the insulator's position and prevent rotation within the housing. A rubber ring is provided between the housing and the insulator to further improve the sealing performance.

[0015] The end face of the hot melt adhesive block is provided with a marking groove. This allows operators to quickly align the hot melt adhesive block when it is installed into the housing, improving assembly efficiency.

[0016] The plate capacitor has a sealing body on the side away from the hot melt adhesive block, which seals the space between the housing and the contacts. The sealing body, contacts, and housing are interference-fitted to achieve a seal at the connector end.

[0017] The beneficial effects of this invention are:

[0018] 1. Excellent sealing performance and good cleaning resistance: This invention achieves a tight bond between the hot melt adhesive block, which is heated and cured, and the contact parts, housing, and insulator. Combined with the rubber ring seal between the housing and the insulator, and the interference fit seal between the sealing body and the contact parts and housing, a multi-seal structure is formed, which fundamentally blocks the penetration channel of cleaning fluid. It can be stably adapted to water-based PCB automatic cleaning processes and effectively avoids failures caused by cleaning fluid residue after cleaning.

[0019] 2. Completely solves the silver migration problem: The plate capacitor adopts a nickel base followed by gold plating. Utilizing the low activity of gold ions, compared with the silver electrode or palladium-silver alloy electrode in the existing technology, it completely eliminates the occurrence of silver migration short circuit faults when the product is powered on, and improves the reliability of the product in complex environments.

[0020] 3. Stable filtering and shielding performance: The internal horizontal teeth of the integrated grounding spring make double tight contact with the outer electrode of the plate capacitor and the external vertical teeth with the shell, ensuring the stability of filtering and conduction; the corresponding design of the bottom wall opening and the inner hole of the plate capacitor can shield electromagnetic waves from propagating from the mating end to the rear end of the connector, achieving 360-degree electromagnetic wave shielding and further optimizing electromagnetic compatibility performance.

[0021] 4. Convenient assembly and short cycle: It abandons the secondary potting and silicone rubber coating process in the existing technology, and adopts the hot melt adhesive block heating and curing method. Combined with a simple assembly process, it greatly shortens the assembly cycle. At the same time, the grounding spring is an integrated structure, which is easy to disassemble. If the capacitor needs to be replaced later, the capacitor and the grounding spring can be removed as a whole, reducing maintenance costs.

[0022] 5. Strong compatibility and wide range of applications: The housing size is the same as that of ordinary non-filtered sockets, which can be replaced in place without modifying the existing installation structure. It is suitable for various equipment and other scenarios that require cleaning resistance and high reliability filtering, and has good promotional value. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a washable filter connector structure according to the present invention;

[0025] Figure 2 This is a schematic diagram of an insulator structure;

[0026] Figure 3 Schematic diagram of hot melt adhesive block structure;

[0027] Figure 4 This is a schematic diagram of the grounding spring structure;

[0028] Figure 5 This is a schematic diagram of a plate capacitor structure;

[0029] Figure 6 This is a schematic diagram of the sealing structure.

[0030] In the diagram: 1. Shell, 2. Insulator, 3. Contact, 4. Rubber ring, 5. Hot melt adhesive block, 6. Grounding spring, 7. Plate capacitor, 8. Sealing body, 9. Spring, 21. Step, 22. First side protrusion, 23. Second side protrusion, 51. Marking groove, 61. Grounding spring sidewall, 62. Grounding spring bottomwall, 63. Internal spring teeth, 64. External spring teeth, 71. Plate capacitor inner hole. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, such as Figure 1 As shown, a washable filter connector includes a housing 1, an insulator 2 and a plate capacitor 7 are installed inside the housing 1, and a contact 3 is disposed inside the insulator 2 and the plate capacitor 7. A heat-curing hot melt adhesive block 5 is disposed between the contact 3 and the housing 1, and the hot melt adhesive block 5 is located between the insulator 2 and the plate capacitor 7. The plate capacitor 7 is connected to the housing 1 through a grounding spring 6, and the plate capacitor 7 is connected to the contact 3 through a spring contact 9. The manufacturing process of the hot melt adhesive block 5 is as follows: first, hot melt adhesive powder or glue sticks are melted into a circular hot melt adhesive cake, and then processed into a hot melt adhesive block 5 that matches the connector node arrangement. See details below. Figure 3 As shown; after the hot melt adhesive block 5 is installed into the connector, the product is placed in an oven for heating and curing, so that the hot melt adhesive block 5 is remelted and cured. The remelting and curing temperature of the hot melt adhesive block 5 is 130-160℃, and the time is 2-4 hours. After the hot melt adhesive block 5 is remelted and cured, the hot melt adhesive bonds to the contact 3, the housing 1, and the insulator 2, thereby fixing the contact 3 in the connector housing 1 and fundamentally blocking the penetration channel of the cleaning fluid. It can stably adapt to the water-based PCB automatic cleaning process and effectively avoid failures caused by cleaning fluid residue after cleaning.

[0033] In addition, the spring 9 can realize a flexible conductive connection between the contact 3 and the plate capacitor 7, which can not only ensure reliable electrical contact between the contact 3 and the plate capacitor 7 to achieve filtering and conduction, but also compensate for the displacement caused by assembly errors and vibration through the elasticity of the spring 9 itself, avoiding poor contact caused by hard contact between the contact 3 and the plate capacitor 7.

[0034] Furthermore, such as Figure 4As shown, the grounding spring 6 includes an integrally connected grounding spring sidewall 61 and grounding spring bottom wall 62. The grounding spring sidewall 61 is provided with internal spring teeth 63 and external spring teeth 64. The internal spring teeth 63 contact the plate capacitor 7, and the external spring teeth 64 contact the housing 1. The function of the grounding spring 6 is to achieve a reliable grounding connection between the plate capacitor 7 and the housing 1, and to efficiently conduct the noise filtered by the plate capacitor 7 to the housing 1 and eliminate it through grounding. The internal spring teeth 63 contact the outer electrode of the plate capacitor 7, and the external spring teeth 64 contact the inner wall of the housing 1, ensuring better contact between the grounding spring 6 and the housing 1 and the plate capacitor 7.

[0035] Furthermore, such as Figure 4 As shown, the internal spring teeth 63 are arranged in a circular array on the side wall 61 of the grounding spring, and the internal spring teeth 62 extend inward along the axis of the grounding spring 61. That is, the internal spring teeth 62 have a horizontal tooth structure, which ensures that the grounding spring 6 and the plate capacitor 7 are reliably connected.

[0036] Furthermore, the end of the internal spring tooth 62 faces the bottom wall 62 of the grounding spring. This avoids the end of the internal spring tooth 62 from abutting against the end face of the plate capacitor 7, which is beneficial for the assembly of the plate capacitor 7 and the grounding spring 6.

[0037] Furthermore, such as Figure 4 As shown, the external spring teeth 64 are arranged in a circumferential array on the side wall 61 of the grounding spring, and the external spring teeth 62 extend outward from the grounding spring 6 along the radial direction of the grounding spring 61. That is, the external spring teeth 64 have a longitudinal tooth structure to ensure a reliable connection between the grounding spring 6 and the housing 1.

[0038] In addition, the grounding of the housing 1 allows the plate capacitor 7 to be better grounded through the grounding spring 6 and the housing 1, ensuring the effective implementation of the filtering function.

[0039] Example 2, based on Example 1, provides a washable filter connector, such as... Figure 5 As shown, the plate capacitor 7 has an inner hole 71, and the bottom wall 62 of the grounding spring has an opening corresponding to the inner hole 71. The plate capacitor 7 is the core component for realizing the filtering function of the connector. It filters out noise interference in the transmitted signal through its own capacitance characteristics, ensuring the pure transmission of the effective signal. The bottom wall 62 of the grounding spring is located on the side of the plate capacitor 7 near the hot melt adhesive block 5. The setting of the bottom wall 62 of the grounding spring can shield electromagnetic waves from propagating from the mating end to the rear end of the connector, thereby achieving a 360-degree shielding effect.

[0040] Furthermore, a nickel layer and a gold plating layer are sequentially formed on the wall of the inner hole 71 of the plate capacitor. The plate capacitor employs a gold-plated process, where a nickel base is applied to the hole wall before gold plating. Because gold ions have relatively low activity, migration and potential malfunctions can be avoided.

[0041] Example 3, based on Example 1, provides a washable filter connector, such as... Figure 2 As shown, the end face of the insulator 2 is provided with a step 21, and the side of the step 21 is provided with a first side protrusion 22 and a second side protrusion 23. The first side protrusion 22 and the second side protrusion 23 respectively mate with the housing 1; a rubber ring 4 is provided between the housing 1 and the insulator 2. The function of the insulator 2 is to achieve insulation isolation between the various contacts 3, avoid signal crosstalk, and at the same time provide precise installation positioning and radial support for the contacts 3, ensuring the stability of signal transmission. Specifically, the first side protrusion 22 and the second side protrusion 23 are of different sizes, which can play a role in preventing errors. When the insulator 2 is rotated into the housing 1, the first side protrusion 22 and the second side protrusion 23 respectively mate with the grooves on the inside of the housing 1 to achieve the limiting and anti-rotation of the insulator 2. In addition, the rubber ring 4 further seals the gap between the housing 1 and the insulator 2, improving the sealing reliability.

[0042] Furthermore, such as Figure 3 As shown, the end face of the hot melt adhesive block 5 is provided with a marking groove 51. When the hot melt adhesive block 5 is installed into the housing 1, it is convenient for the operator to quickly align the hot melt adhesive block 5, thereby improving assembly efficiency.

[0043] Furthermore, such as Figure 6 As shown, a sealing body 8 is provided on the side of the plate capacitor 7 away from the hot melt adhesive block 5. The sealing body 8 seals the space between the housing 1 and the contact 3. The sealing body 8, the contact 3, and the housing 1 are press-fitted to achieve a seal at the connector end.

[0044] The connector assembly process is as follows: 1. Melt hot melt adhesive powder or sticks into a disc shape, then process the disc-shaped hot melt adhesive into a hot melt adhesive block 5 that fits the connector node, such as... Figure 3 As shown;

[0045] 2. Assemble the plate capacitor 7, contact 3, spring 9, hot melt adhesive block 5, and grounding spring 6 into a component, and then transfer the component into the housing 1. The insulator 2 is inserted into the housing 1 from the mating end of the connector.

[0046] 3. Place the product in an oven and heat it to cure. The hot melt adhesive block will be melted and cured 5 times. The temperature for the hot melt adhesive block to be melted and cured 5 times is 130-160℃ and the time is 2-4 hours. After the hot melt adhesive block is melted and cured 5 times, it will bond to the contact part 3, the shell 1 and the insulator 2.

[0047] 4. After removing the product, install the sealing body 8. The connector assembly is now complete.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A washable filter connector, comprising a housing (1), an insulator (2) and a plate capacitor (7) installed inside the housing (1), and a contact (3) passing through the insulator (2) and the plate capacitor (7), characterized in that, A hot melt adhesive block (5) that is heated and cured is provided between the contact (3) and the housing (1). The hot melt adhesive block (5) is located between the insulator (2) and the plate capacitor (7). The plate capacitor (7) is connected to the housing (1) through the grounding spring (6). The plate capacitor (7) is connected to the contact (3) through the spring piece (9).

2. The washable filter connector according to claim 1, characterized in that, The grounding spring (6) includes an integrally connected grounding spring sidewall (61) and grounding spring bottomwall (62). The grounding spring sidewall (61) is provided with an inner spring tooth (63) and an outer spring tooth (64). The inner spring tooth (63) contacts the plate capacitor (7), and the outer spring tooth (64) contacts the housing (1).

3. The washable filter connector according to claim 2, characterized in that, The internal spring teeth (63) are arranged in a circular array on the side wall (61) of the grounding spring, and the internal spring teeth (62) extend into the inside of the grounding spring (6) along the axis of the grounding spring (61).

4. The washable filter connector according to claim 3, characterized in that, The end of the internal spring tooth (62) faces the bottom wall (62) of the grounding spring.

5. The washable filter connector according to claim 2, characterized in that, The outer spring teeth (64) are arranged in a circumferential array on the side wall (61) of the grounding spring, and the outer spring teeth (62) extend outward from the grounding spring (6) along the radial direction of the grounding spring (61).

6. The washable filter connector according to any one of claims 1 to 5, characterized in that, The plate capacitor (7) has an inner hole (71), and the bottom wall (62) of the grounding spring has an opening corresponding to the inner hole (71).

7. The washable filter connector according to claim 6, characterized in that, The inner wall of the plate capacitor (71) is provided with a nickel layer and a gold plating layer in sequence.

8. The washable filter connector according to claim 1 or 7, characterized in that, The end face of the insulator (2) is provided with a step (21), and the side of the step (21) is provided with a first side protrusion (22) and a second side protrusion (23). The first side protrusion (22) and the second side protrusion (23) respectively cooperate with the housing (1); a rubber ring (4) is provided between the housing (1) and the insulator (2).

9. The washable filter connector according to claim 8, characterized in that, The end face of the hot melt adhesive block (5) is provided with a marking groove (51).

10. The washable filter connector according to any one of claims 1, 7, and 9, characterized in that, The plate capacitor (7) has a sealing body (8) on the side away from the hot melt adhesive block (5), and the sealing body (8) seals the space between the shell (1) and the contact (3).

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