Mixed round filtering connector

Abstract

The invention relates to a mixed installation circular filtering connector which comprises a circular shell extending in the axial direction, a plurality of first contact pieces and a plurality of second contact pieces are assembled in the shell, a printed board component is further arranged in the shell, and the printed board component comprises a printed board and a filtering capacitor fixed to the printed board. The printed board is provided with a first through hole for the first contact element to pass through and a second through hole for the second contact element to pass through, the first contact element is in clearance fit with the printed board, the second contact element is in contact conduction with the printed board through an elastic sheet, and the printed board is also in contact conduction with the inner circumferential surface of the shell through a first grounding spring fixed at the periphery of the printed board. By introducing the printed board component, the filtering requirement is met, the mounting size and the opening size of an original non-filtering connector of the same type are not changed, and in-situ replacement can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of filter connectors, and in particular relates to a mixed circular filter connector. Background Art

[0002] Filter connectors are conventional low-frequency connectors with added filtering components such as capacitors and inductors to help equipment pass electromagnetic compatibility tests. Filter connectors offer high reliability and can replace conventional electrical connectors in-situ. Currently, filter connectors are widely used in military applications such as aviation, aerospace, electronics, weapons, and communications, and have broad application prospects.

[0003] With the widespread use of airborne optical signals, customers are increasingly adopting hybrid optoelectronic sockets, leading to an increasing number of electromagnetic compatibility (EMC) issues. Customers are raising new EMC requirements, demanding filtering at the connector end. Conventional filtered electrical connectors typically employ internal plate capacitors for filtering. However, since plate capacitors are ceramic, they require internal potting and fixation with potting compound. For hybrid optoelectronic connectors, the optical cable cannot directly contact the potting compound. This inconsistency prevents conventional filtering methods from being used in hybrid optoelectronic connectors, leading to significant differences in appearance and size between the added filtering and the original non-filtered connectors. Furthermore, for AC / DC hybrid connectors, plate capacitors cannot meet the filtering requirements of the AC ports, further preventing conventional filtering methods from being used in hybrid AC / DC connectors. This ultimately results in significant differences in appearance and size between the added filtering and the original non-filtered connectors. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of mixed circular filter connector, which meets the filtering requirements by arranging a printed circuit board component in the connector. The connector has the same installation dimensions and opening dimensions as the same type of non-filtering connector, and can be replaced in situ.

[0005] The objectives of the present invention and the technical problems solved therein are achieved by adopting the following technical solutions. A mixed circular filter connector proposed in the present invention comprises an axially extending circular housing 1, characterized in that: a plurality of first contacts and a plurality of second contacts are assembled within the housing 1, and a printed circuit board assembly is also provided within the housing 1, comprising a printed circuit board 4 and a filter capacitor 5 fixed to the printed circuit board 4; the printed circuit board 4 is provided with a first through-hole for the first contacts to pass through, and a second through-hole for the second contacts to pass through; the first contacts are loosely fitted with the printed circuit board 4, and the second contacts are in contact and conduction with the printed circuit board 4 via a spring 7; the printed circuit board 4 is also in contact and conduction with the inner circumference of the housing 1 via a first grounding spring 8 fixed to its outer circumference.

[0006] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0007] In the aforementioned mixed circular filter connector, the first grounding spring 8 includes a cylindrical main portion 83 and an annular folded edge 81 formed by folding the two ends of the main portion 83 inwardly. The main portion 83 is sleeved on the outer peripheral surface of the printed circuit board 4, and the two annular folded edges 81 are respectively attached to the front and rear end surfaces of the printed circuit board 4; the annular folded edge 81 is also provided with a clip 82 extending along the axial direction of the printed circuit board 4 and adapted to engage with the groove on the end surface of the printed circuit board 4.

[0008] In the aforementioned mixed circular filter connector, a plurality of through holes 43 extending in the axial direction are uniformly distributed along the circumferential direction on the edge of the printed circuit board 4 , and the clips 82 are locked in the through holes 43 .

[0009] In the aforementioned mixed circular filter connector, the outer peripheral surface and the edges of both end surfaces of the printed circuit board 4 are made of exposed copper.

[0010] In the aforementioned mixed circular filter connector, a plurality of inner end teeth 84 for contacting and conducting with the outer peripheral surface of the printed circuit board 4 are distributed circumferentially on the inner peripheral surface of the main body portion 83 of the first grounding spring 8, and a plurality of outer end teeth 85 for contacting and conducting with the inner peripheral surface of the housing 1 are distributed circumferentially on the outer peripheral surface.

[0011] In the aforementioned mixed circular filter connector, the inner end teeth 84 and the outer end teeth 85 are spaced apart in the front and back axial direction of the main body portion 83 .

[0012] In the aforementioned mixed circular filter connector, the fixed ends of the inner end teeth 84 and the outer end teeth 85 are close to each other, and the free ends are away from each other.

[0013] In the aforementioned mixed circular filter connector, the first grounding spring 8 is in a strip shape before being assembled with the printed circuit board 4 .

[0014] In the aforementioned mixed circular filter connector, the spring piece 7 is in a bulging waist shape with radial dimensions gradually shrinking from both ends to the middle.

[0015] In the aforementioned mixed circular filter connector, the rear end portion of the spring 7 is folded outward to form a flange 71 for contacting the pad on the rear end surface of the printed circuit board 4.

[0016] In the aforementioned mixed circular filter connector, the spring piece 7 is C-shaped with one side open, and is firmly fixed in the printed circuit board 4 .

[0017] In the aforementioned mixed circular filter connector, the first contact is an optical contact 2, and the second contact is an electrical contact 3. The optical contact is fixedly assembled in the optical contact mounting hole 14 in the housing 1 through a pressure plate 6, and the optical contact mounting hole 14 is a stepped hole; the electrical contact 3 is assembled in the electrical contact mounting hole 15 in the housing 1 through an insulating sleeve 9.

[0018] In the aforementioned mixed circular filter connector, the second through holes on the printed circuit board 4 for the optical contacts 2 to pass through are interconnected, so that a flower-shaped avoidance hole 41 is formed in the center of the printed circuit board 4 .

[0019] In the aforementioned mixed circular filter connector, the first contact piece is a low-voltage DC contact piece 16, and the second contact piece is a high-voltage AC contact piece 17. A plate capacitor 20 is also provided in the shell 1. The plate capacitor 20 is in contact and conductive with the low-voltage DC contact piece 16 through a spring, and the high-voltage AC contact piece 17 passes through the plate capacitor 20 and fits in with the gap therebetween; the outer periphery of the plate capacitor 20 is in contact and conductive with the inner circumference of the shell 1 through a second grounding spring 18.

[0020] The aforementioned mixed circular filter connector has an insulator 19 in the housing 1 for supporting and positioning the low-voltage DC contact 16 and the high-voltage AC contact 17. Glue is injected into the housing 1 between the insulator 19 and the plate capacitor and between the plate capacitor and the printed circuit board components.

[0021] In the aforementioned mixed circular filter connector, a number plate 21 is further provided at the rear end of the cavity of the housing 1 , and glue is also filled between the number plate 21 and the printed circuit board component.

[0022] In the aforementioned mixed circular filter connector, the printed circuit board 4 is a ring-shaped structure, the center of which is a glue injection hole 44 for glue to pass through.

[0023] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technological advancement and practicality, and has wide industrial application value. It has at least the following advantages:

[0024] The present invention utilizes a printed circuit board design to enable the mixed installation of different contact types within a circular housing while also meeting filtering requirements. Furthermore, the mounting dimensions and opening dimensions of the various components of the present filter connector remain consistent with those of the original, non-filtered connector, enabling in-situ replacement. Compared to adding filters to peripheral circuits, the present invention offers a compact size, lightweight design, and space-saving features.

[0025] When the hybrid filter connector of the present invention is optoelectronic, it is reworkable. Conventional filter connectors use a plate-type capacitor structure and are encapsulated with epoxy glue on the front and back. Once a problem occurs, they are not reworkable and must be scrapped as a whole. However, once the product of the present invention fails, it can be quickly reworked and replaced. First, the printed circuit board assembly and the electrical contacts are removed. The electrical contacts can be replaced and repaired, and the capacitors can also be replaced. Then, the pressure plate is removed, and finally the optical contacts are removed for repair and replacement. All parts of the optoelectronic hybrid connector are removable for rework and repair.

[0026] The connector of the present invention not only meets the requirements of different types of signal transmission, but also meets the filtering requirements, and does not change the installation and opening size of the connector when there is no filtering function, and has a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of a mixed circular filter connector in this embodiment;

[0028] Figure 2 is a schematic diagram of a shell structure in this embodiment;

[0029] Figure 3 Schematic diagram of the structure of a printed circuit board component in this embodiment;

[0030] Figure 4 is a schematic structural diagram of an optical contact member in this embodiment;

[0031] Figure 5 is a schematic diagram of the structure of an electrical contact in this embodiment;

[0032] Figure 6 Schematic diagram of the structure of an insulating sleeve in this embodiment;

[0033] Figure 7 for Figure 1 A partial enlarged view of

[0034] Figure 8 is a schematic structural diagram of a first grounding spring after assembly in this embodiment;

[0035] Figure 9 is a schematic diagram of a first grounding spring in an unassembled state in this embodiment;

[0036] Figure 10 for Figure 9 Side view of;

[0037] Figure 11 Schematic diagram of the cooperation between a printed circuit board component and a first grounding spring in this embodiment;

[0038] Figure 12 is a top view of a mixed circular filter connector in this embodiment;

[0039] Figure 13 for Figure 1 Another enlarged view of a part;

[0040] Figure 14 Schematic diagram of a spring structure in this embodiment;

[0041] Figure 15 is a schematic diagram showing another view of a spring in this embodiment;

[0042] Figure 16 Schematic diagram of the structure of two mixed circular filter connectors in this embodiment;

[0043] Figure 17 for Figure 16 A partial enlarged view of

[0044] Figure 18 is a top view of two mixed circular filter connectors in this embodiment;

[0045] Figure 19 FIG. 2 is a schematic diagram of the structure of the printed circuit board component in the second embodiment.

[0046]

Main component symbol description

[0047] 1: Housing 2: Optical contact

[0048] 3: Electrical contacts 4: Printed circuit board

[0049] 41: Avoidance hole 42: Matching hole

[0050] 43: Via 5: Filter capacitor

[0051] 6: Pressure plate 7: Shrapnel

[0052] 71: Flanged 72: Hollow

[0053] 8: First grounding spring 81: Annular fold

[0054] 82: Buckle 83: Main body

[0055] 84: Inner end teeth 85: Outer end teeth

[0056] 9: Insulation sleeve 10: Interface sealing body

[0057] 11: Rubber ring 12: Nut

[0058] 13: Sealing ring 14: Optical contact mounting hole

[0059] 141: Step surface 15: Electrical contact mounting hole

[0060] 16: Low voltage DC contact 17: High voltage AC contact

[0061] 18: Second grounding spring 19: Insulator

[0062] 20: Plate capacitor 21: Numbered plate

[0063] 22: Glue filling area 44: Glue filling hole DETAILED DESCRIPTION

[0064] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the mixed circular filter connector proposed by the present invention in combination with the accompanying drawings and preferred embodiments.

[0065] See also Figure 1-15 , which is a schematic diagram of the various components of a hybrid circular filter connector according to the present invention. This hybrid circular filter connector comprises an axially extending circular housing 1. This housing 1 is conductive, preferably made of aluminum alloy or stainless steel for its conductivity and excellent shielding and filtering effects, but this is not limiting. In this embodiment, the connector is an optoelectronic hybrid filter connector. Housing 1 is provided with an optical contact mounting hole 14 for positioning and assembling the optical contact 2, and an electrical contact mounting hole 15 for positioning and assembling the electrical contact 3.

[0066] The optical contact 14 is directly inserted into the optical contact mounting hole 14, while the electrical contact 3 is assembled in the electrical contact mounting hole 15 via the insulating sleeve 9. Specifically, the optical contact mounting hole 14 is a stepped hole, and the inner side of its front end is provided with a stepped surface 141 for limiting the axial forward position of the optical contact 2. The front end of the optical contact 2 has a stepped surface that axially stops and limits the stepped surface 141. The stepped surface is formed by the change in the radial dimension of the outer periphery of the front end of the optical contact 2 from small to large. Preferably, the outer periphery of the optical contact 2 is also provided with multiple sealing rings spaced axially, which are used to achieve a seal with the inner periphery of the optical contact mounting hole 14. The insulating sleeve 9 is adhesively fixed to the electrical contact mounting hole 15 and has a through hole therein through which the power supply contact 3 passes. In this embodiment, the electrical contact 3 is a pin, and the electrical contact mounting hole 15 is a through hole. The insulating sleeve 9 is generally made of a material with good insulation performance. Preferably, the insulating sleeve 9 is made of polytetrafluoroethylene or PEEK. For applications with higher voltages, the outer diameter of the insulating sleeve needs to be increased to meet the electrical clearance requirements.

[0067] A pressing plate 6 is further provided in the housing 1 for limiting the optical contact 14 axially backward so that the optical contact 14 is fixed in the housing 1. In this embodiment, the pressing plate 6 is fixed in the housing 1 by screws, but the present invention is not limited thereto.

[0068] The housing 1 also houses a printed circuit board assembly comprising a printed circuit board 4 and a filter capacitor 5 secured to the printed circuit board 4. In this embodiment, the filter capacitor 5 is welded to the rear end of the printed circuit board 4. The printed circuit board 4 is in contact with and electrically connected to the housing 1, and is provided with a clearance hole 41 through which the optical contact 2 can pass freely. In this embodiment, the optical contact 2 is located in the central area of ​​the housing 1, and the clearance hole 41 is a flower-shaped through hole in the center of the printed circuit board 4, but the present invention is not limited thereto.

[0069] The printed circuit board 4 is also provided with a matching hole 42 through which the front end of the power supply contact 3 passes. The matching hole 42 is also provided with a spring piece 7 for contacting and conducting with the electrical contact 3. In this embodiment, the spring piece 7 is interference-fitted in the matching hole 42 and elastically contacts the electrical contact 3 passing through the inner through hole thereof. The spring piece 7 is bulging-waisted in shape, and its radial dimension gradually shrinks from both ends to the middle, forming a bulging waist in the middle. The inner diameter of the middle bulging waist is smaller than the outer diameter of the electrical contact 3, thereby maintaining reliable elastic contact with the electrical contact 3. Compared with conventional point contact spring pieces, the bulging-waisted spring piece of the present invention has lower contact resistance, better filtering effect, and higher contact reliability in high-vibration environments.

[0070] In this embodiment, the rear end of the spring clip 7 is folded outward to form a flange 71, which contacts the pad on the rear end of the printed circuit board 4, further ensuring the contact reliability between the spring clip 7 and the printed circuit board 4. Preferably, the spring clip 7 is C-shaped with one side open. The C-shaped opening allows the radial dimension of the spring clip 7 to be flexible, so that the spring clip 7 can be smoothly forced into the matching hole 42 and maintain reliable contact with the matching hole 42. The spring clip 7 of the present invention can achieve 360-degree contact with the electrical contact 3, avoiding the zero capacitance phenomenon. Preferably, the spring clip 7 is circumferentially distributed with a plurality of hollows 72 extending in the axial direction. The provision of the hollows 72 can enhance the contact elastic force of the waist portion of the spring clip 7.

[0071] In this embodiment, the outer periphery of the printed circuit board 4 is in contact with the housing 1 via the first grounding spring 8. Preferably, the outer periphery of the printed circuit board 4 and the edges of its front and rear ends are exposed copper to provide better contact with the first grounding spring 8.

[0072] In this embodiment, the main body 83 of the first grounding spring 8 is cylindrical, and both ends of the main body 83 are folded inward to form an annular fold 81. The inner side of each annular fold 81 is provided with a buckle 82 for fitting and buckling with the groove on the end surface of the printed circuit board 4. When not assembled, the main part 83 of the first grounding spring 8 is a stamped strip structure, and both ends of the strip structure are folded inward to form a folded edge. During assembly, the strip structure is bent into a circle to form the main part 83, and the folded edge forms an annular folded edge 81. The main part 83 is put on the outer peripheral surface of the printed circuit board 4. At this time, the annular folded edges 81 at both ends of the first grounding spring 8 are respectively attached to the front and rear end surfaces of the printed circuit board 4, and a buckle 82 is also provided on the surface where the annular folded edge 81 contacts the printed circuit board 4. The buckle 82 is extended axially along the printed circuit board 4 and clamped into the corresponding groove on the front and rear end surfaces of the printed circuit board 4, so that a reliable connection between the first grounding spring 8 and the printed circuit board 4 can be achieved. At the same time, the setting of the buckle 82 also forms a grounding path between the printed circuit board 4 and the first grounding spring 8, thereby enhancing the reliability of the grounding connection between the printed circuit board 4 and the first grounding spring 8.

[0073] In this embodiment, the edge of the printed circuit board 4 is uniformly distributed along the circumference, with multiple axially extending through-holes 43. Clips 82 on the annular hems 81 at each end of the first grounding spring 8 engage the ends of these through-holes 43, respectively. This not only secures the first grounding spring 8 on the printed circuit board 4 but also establishes a grounding path between the printed circuit board 4 and the first grounding spring 8. Furthermore, because the edges of the printed circuit board 4 are exposed copper, the annular hems 81 adhere to the exposed copper on both sides of the printed circuit board 4, ensuring better contact between the two.

[0074] The main portion 83 of the first grounding spring 8 has a plurality of inner teeth 84 distributed along its inner circumference for elastically contacting the outer circumference of the printed circuit board 4. The outer portion has a plurality of outer teeth 85 distributed along its outer circumference for elastically contacting the inner circumference of the housing 1. In this embodiment, the inner and outer teeth 84, 85, are spaced axially apart within the main portion 83. Preferably, the inner teeth 84 have their free ends at the front and their fixed ends at the back, formed by bending their free ends inward. The outer teeth 85 have their free ends at the back and their fixed ends at the front, formed by bending their free ends outward. In this embodiment, the printed circuit board and the housing are connected via the first grounding spring 8, achieving 360-degree shielding and grounding. The front and rear teeth of the first grounding spring are bent inward and outward, respectively, ensuring better contact with both the printed circuit board 4 and the housing 1, preventing poor grounding due to uneven flatness of the inner circumference of the housing 1 or the outer circumference of the printed circuit board 4. This also ensures stable axial support for the first grounding spring 8. In this embodiment, eight clips 82 are provided on the annular folded edges 81 at both ends of the first grounding spring. Two clips form a group, and four groups of clips 82 are evenly distributed along the circumference. The clips 82 cooperate with the through holes 43 on the printed circuit board 4 to achieve reliable fixation of the first grounding spring and the printed circuit board. The assembly is simple and reworkable, the clips are detachable, and the contact is reliable.

[0075] In this embodiment, the spring 1 and the first grounding spring 8 are made of beryllium copper, but are not limited thereto.

[0076] In this embodiment, the electrical contacts 3 are evenly distributed around the periphery of the optical contacts 2, so that the contact distribution positions and housing dimensions of the optoelectronic hybrid filter connector in this embodiment are consistent with those of existing optoelectronic hybrid connectors.

[0077] In this embodiment, the filter capacitor 5 is fixedly located around the outer ring of the printed circuit board 4, avoiding the contact distribution area. The rear end of the housing 1 has an internal hole that is smaller in front and larger in the back. The smaller diameter section at the front is used to mount the pressure plate 6, while the larger diameter section at the rear is used to mount the printed circuit board components. The front end of the printed circuit board 4 and the stepped surface formed by the change in the internal hole size within the housing 1 form an axial stop. The printed circuit board 4 is fixed to the housing 1 using fasteners or adhesive. The cables at the rear end of the contact are all located behind the printed circuit board.

[0078] In this embodiment, a nut 12 is provided on the outer periphery of the housing 1 for locking the connector after plugging in. A sealing ring 13 is also provided on the outer periphery of the housing 1 for sealing with the mounting panel of the adapter end.

[0079] The front end of the housing 1 is also provided with an interface seal 10. The optical contact 2 and the electrical contact 3 pass through corresponding through holes in the interface seal 10 and are sealed with the interface seal 10. A rubber ring 11 is also fixedly provided on the inner side of the front end of the housing 1 to achieve a seal with the adapter housing.

[0080] In this embodiment, when assembling the connector, the printed circuit board 4 and the filter capacitor 5 are first welded to form a printed circuit board assembly. The first grounding spring 8 and the spring clip 7 are then installed on the printed circuit board assembly, and the finished product is assembled. During assembly, the optical contact 2 is first installed into the optical contact mounting hole 14 in the housing 1. The insulating sleeve 9 is then installed into the electrical contact mounting hole 15 and secured thereto using an adhesive. The pressure plate 6 is then installed into the housing 1 to securely position the optical contact 2. The printed circuit board assembly with the first grounding spring 8 and the spring clip 7 is then installed into the housing 1. The electrical contact 3 is then installed into the housing, with its front end passing through the insulating sleeve 9 and positioned in alignment with the insulating sleeve. The rear end is then in contact with the printed circuit board assembly via the spring clip 7, and the tail portion is located at the rear end of the printed circuit board assembly for connection to a cable. The filtering function is primarily achieved by the filter capacitor, which operates on the principle of "passing high frequencies and blocking low frequencies." A path is formed through the contact, printed circuit board, filter capacitor, first grounding spring, and housing, bypassing high-frequency interference to the housing ground, thereby filtering electromagnetic interference. The optical aperture contact of the present invention is removable, and the filtering function of the electrical aperture meets the electromagnetic compatibility requirements of the equipment.

[0081] The optoelectronic hybrid filter connector product of the embodiment of the present invention is repairable. Conventional filter connectors adopt a plate capacitor structure and are potted with epoxy glue on the front and back. Once a problem occurs, they are not repairable and can only be scrapped as a whole. However, once the product of the present invention fails, it can be quickly reworked and replaced. First, the printed circuit board component is removed together with the electrical contact. The electrical contact can be replaced and repaired, and the capacitor can also be replaced. Then the pressure plate is removed, and finally the optical contact is removed for repair and replacement.

[0082] When the present invention is applied to an optoelectronic hybrid filter connector, the installation dimensions and opening dimensions of the various components of the connector can be consistent with those of the original non-filtering socket of the same type; and the solution has better reworkability, and all parts can be disassembled for rework and repair.

[0083] See also Figure 16-19 , which is a schematic structural diagram of the various parts of the mixed filter connector according to the second embodiment of the present invention. In this embodiment, the mixed contacts in the shell 1' include a low-voltage DC contact 16 and a high-voltage AC contact 17. The shell 1' is also provided with a plate capacitor 20. The low-voltage DC contact 16 is in contact with the plate capacitor 20 through the spring 7', and the high-voltage AC contact 17 passes through the plate capacitor 20 and is loosely fitted with the plate capacitor 20; the shell 1' is also provided with a printed circuit board component, which consists of a printed circuit board 4' and a filter capacitor 5' welded and fixed to the printed circuit board 4'; the low-voltage DC contact 16 passes through the printed circuit board 4' and is loosely fitted with the printed circuit board 4', and the high-voltage AC contact 17 is in contact with the printed circuit board 4' through the spring 7'.

[0084] In this embodiment, a first grounding spring 8' is fixed to the outer periphery of the printed circuit board 4'. This first grounding spring has the same structure as the first grounding spring in the first embodiment. The printed circuit board 4' is in contact and conductive with the inner periphery of the housing 1' via the first grounding spring 8'. The printed circuit board 4' is also provided with a via 43' for snap-fitting with the first grounding spring 8'. The outer periphery of the plate capacitor 20 is in contact and conductive with the inner periphery of the housing 1' via a second grounding spring 18.

[0085] In this embodiment, the structure of the spring piece 7 ′ is the same as that of the spring piece 7 in the first embodiment, both being waist-shaped spring pieces.

[0086] In this embodiment, the low-voltage DC contact 16 and the high-voltage AC contact 17 are both positioned within the housing 1' by an insulator 18. Furthermore, within the housing 1', there are glue-filling areas 22 for injecting glue between the plate capacitor 20 and the insulator 18, between the plate capacitor 20 and the printed circuit board component, and between the printed circuit board component and the numbering plate 21 disposed within the rear cavity of the housing 1'. The glue injected into this glue-filling space positions and seals the contacts with the housing. Preferably, an annular groove for enhancing the seal between the glue and the housing 1' is further provided at a position on the inner circumference of the housing 1' corresponding to the glue-filling area 22.

[0087] To facilitate glue injection, in this embodiment, the printed circuit board 4' is annular, with a glue injection hole 44 located in the center for the glue to flow through. This injection hole 44 allows for glue flow between both sides of the printed circuit board, enabling rapid glue injection. The annular body of the printed circuit board 4' is provided with a first through-hole 45 adapted for the high-voltage AC contact 17 and a second through-hole 46 adapted for the low-voltage DC contact 16.

[0088] The AC / DC mixed filter connector of the present invention meets the requirements of simultaneous AC and DC filtering of equipment without changing the installation and opening size of the original socket, and has a compact structure.

[0089] The hybrid filter connector of the present invention has a compact structure and the installation opening size is consistent with that of the same type of low-frequency connector, which can be replaced in situ. Compared with installing filters on peripheral circuits, it is small in size, light in weight, and saves equipment space.

[0090] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mixed circular filter connector, comprising a circular housing (1) extending in an axial direction, characterized in that: A plurality of first contact members and a plurality of second contact members are assembled in the housing (1). A printed circuit board component is also provided in the housing (1). The printed circuit board component includes a printed circuit board (4) and a filter capacitor (5) fixed on the printed circuit board (4). The printed circuit board (4) is provided with a first through hole for the first contact member to pass through and a second through hole for the second contact member to pass through. The first contact member and the printed circuit board (4) are clearance-matched. The second contact member is in contact and conduction with the printed circuit board (4) via a spring (7). The printed circuit board (4) is also in contact and conduction with the inner peripheral surface of the housing (1) via a first grounding spring (8) fixed on its outer periphery.

2. The mixed circular filter connector according to claim 1, characterized in that: The first grounding spring (8) comprises a cylindrical main body (83) and an annular folding edge (81) formed by folding the two ends of the main body (83) inwardly, wherein the main body (83) is sleeved on the outer peripheral surface of the printed circuit board (4) to achieve conduction between the printed circuit board (4) and the inner periphery of the shell (1), and the two annular folding edges (81) are respectively attached to the front and rear end surfaces of the printed circuit board (4), and the annular folding edge (81) is provided with a snap (82) for fitting and buckling with the groove on the end surface of the printed circuit board (4).

3. The mixed circular filter connector according to claim 2, characterized in that: The edge of the printed circuit board (4) is uniformly distributed along the circumference with a plurality of through holes (43) extending in the axial direction, and the buckles (82) are clamped in the through holes (43).

4. The mixed circular filter connector according to claim 3, characterized in that: The outer peripheral surface and the edges of the front and rear end surfaces of the printed circuit board (4) all adopt an exposed copper structure.

5. The mixed circular filter connector according to claim 2, characterized in that: The inner circumferential surface of the main body portion (83) is provided with a plurality of inner end teeth (84) distributed along the circumferential direction for contacting and conducting with the outer circumferential surface of the printed circuit board (4), and the outer circumferential surface is provided with a plurality of outer end teeth (85) distributed along the circumferential direction for contacting and conducting with the inner circumferential surface of the housing (1).

6. The mixed circular filter connector according to claim 5, characterized in that: The inner end teeth (84) and the outer end teeth (85) are spaced apart and distributed in the front and back axial directions of the main body (83).

7. The mixed circular filter connector according to claim 6, characterized in that: The fixed ends of the inner end teeth (84) and the outer end teeth (85) are close to each other, and the free ends are away from each other.

8. The mixed circular filter connector according to claim 7, characterized in that: The first grounding spring (8) is in a strip shape before being assembled with the printed circuit board (4).

9. The mixed circular filter connector according to any one of claims 1 to 8, characterized in that: The spring piece (7) is in a waist-shaped shape with radial dimensions gradually shrinking from both ends to the middle.

10. The mixed circular filter connector according to claim 9, characterized in that: The rear end portion of the spring piece (7) is folded outward to form a flange (71) for contacting the soldering pad on the rear end surface of the printed circuit board (4).

11. The mixed circular filter connector according to claim 9, characterized in that: The spring piece (7) is C-shaped with one side open and is fixed in the printed circuit board (4).

12. The mixed circular filter connector according to any one of claims 1-8, 10-11, characterized in that: The first contact piece is an optical contact piece (2), and the second contact piece is an electrical contact piece (3). The optical contact piece is fixedly assembled in an optical contact piece mounting hole (14) in the housing (1) via a pressure plate (6); and the electrical contact piece (3) is assembled in an electrical contact piece mounting hole (15) in the housing (1) via an insulating sleeve (9).

13. The mixed circular filter connector according to claim 12, characterized in that: The second through holes on the printed circuit board (4) for the optical contact element (2) to pass through are interconnected, so that a flower-shaped avoidance hole (41) is formed in the center of the printed circuit board (4).

14. The mixed circular filter connector according to any one of claims 1-8, 10-11, characterized in that: The first contact piece is a low-voltage DC contact piece (16), and the second contact piece is a high-voltage AC contact piece (17). A plate capacitor (20) is also provided in the housing (1). The plate capacitor (20) is in contact and conduction with the low-voltage DC contact piece (16) via a spring piece, and the high-voltage AC contact piece (17) passes through the plate capacitor (20) and is gap-matched with the plate capacitor (20). The outer periphery of the plate capacitor (20) is in contact and conduction with the inner periphery of the housing (1) via a second grounding spring (18).

15. The mixed circular filter connector according to claim 14, characterized in that: An insulator (19) for supporting and positioning the low-voltage DC contact piece (16) and the high-voltage AC contact piece (17) is also provided in the housing (1). Glue is poured into the housing (1) between the insulator (19) and the plate capacitor, and between the plate capacitor and the printed circuit board component.

16. The mixed circular filter connector according to claim 15, characterized in that: The tail of the cavity of the housing (1) is also provided with a numbering plate (21), and glue is also filled between the numbering plate (21) and the printed circuit board component.

17. The mixed circular filter connector according to claim 15, characterized in that: The printed circuit board (4) is annular, and the center thereof is a glue injection hole (44) for glue liquid to pass through.

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