High-shielding radio frequency connector capable of preventing pin withdrawing

Abstract

The utility model discloses a high-shielding radio frequency connector capable of preventing pin withdrawing, which comprises a die casting main shell provided with an accommodating cavity penetrating through a butt joint surface and a mounting surface, a central terminal arranged in the accommodating cavity and an insulating body, and is characterized in that the central terminal is a cylindrical bent piece without an assembly clamping point on the surface; the insulating body wraps the central terminal through a metal in-mold forming process and is installed in the accommodating cavity, the accommodating cavity is a cylindrical straight-through hole which keeps a coaxial structure configuration with the central terminal, and the rear end part of the die casting main shell is provided with a rear cover piece which is used for stopping and limiting the rear side surface of the insulating body. According to the radio frequency connector with the structure, the falling risk of the retreated PIN is solved, meanwhile, the radio frequency performance is improved, and the technical effect of high shielding is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of connectors, and particularly relates to a high-shielding radio frequency connector with anti-pin-retraction function. Background Art

[0002] In order to achieve the interconnection of signal transmission between electronic devices, connectors are usually used. For example, in order to achieve the transmission of radio frequency signals of terminal devices such as mobile communication and satellite navigation, coaxial connectors are widely used due to their advantages such as good shielding effect and high signal transmission quality. As is well known, a coaxial connector includes a center terminal, an inner plastic, and a shielding body. In order to achieve assembly positioning and assemblability, the center terminal is usually fixed in the inner plastic by interference snap points, and then the inner plastic assembly is fixed in the shielding body by an interference structure to form a final radio frequency connector with a coaxial structure.

[0003] With the differences in application objects, frequencies, powers, application environments, etc., higher requirements are put forward for the operating frequency, radio frequency performance, EMC shielding effectiveness, and stability of radio frequency connectors. For example, with the rapid development of the automotive industry in China, the demand for connectors in automobiles is also increasing day by day. Most of the existing radio frequency connectors adopt a pin structure, and there are safety hazards such as pin retraction due to loosening between parts during use. On the other hand, due to process limitations, the operating frequency is not high. At the same time, the center terminal is not wrapped by the shielding body, and there will be differences in EMC shielding effectiveness. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-shielding radio frequency connector that can prevent pin retraction, has a reliable structure, and can improve radio frequency index performance.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-shielding radio frequency connector with anti-pin-retraction function includes a die-cast main shell with a receiving cavity having a through docking surface and an installation surface, a center terminal installed in the receiving cavity, and an insulating body. The center terminal is a cylindrical bent part without assembly snap points on its surface. The insulating body wraps the center terminal through an in-mold forming process and is installed in the receiving cavity. The receiving cavity is a cylindrical straight through hole configured coaxially with the center terminal. A rear cover member is provided at the rear end of the die-cast main shell to stop and limit the rear side of the insulating body.

[0007] Preferably, a plug-in plastic shell with a plug-in hole is clamped on the docking surface of the die-cast main shell. The front part of the die-cast main shell extends to a docking cylindrical part of the plug-in hole. A snap ring is circumferentially and radially protruded on the outer side wall of the docking cylindrical part and is interference-clamped in the plug-in hole.

[0008] Preferably, a limiting groove extending upward and communicating with the accommodating cavity is provided on the mounting surface of the main die-cast shell, and the limiting groove is used for inserting and mounting the rear cover member into the main die-cast shell.

[0009] Preferably, an assembly curved surface extending upward and communicating with the limiting groove is provided on the mounting surface of the main die-cast shell. The assembly curved surface and the assembly curved surface provided on the rear cover member enclose a cylindrical combined cavity, which accommodates and limits the rear section of the insulating body and is coaxially arranged with it.

[0010] Preferably, within the cylindrical cavity region of the entire path from the docking surface to the mounting surface formed by the communication between the accommodating cavity and the combined cavity, the center line of the center terminal coincides with the center line of the entire cylindrical cavity.

[0011] Preferably, the depth of the upward extension of the limiting groove exceeds the upper surface of the accommodating cavity, so as to form an effective fit between the wall surface of the rear cover member and the tail wall surface of the accommodating cavity.

[0012] The beneficial effects of the present utility model are as follows: A high shielding radio frequency connector for preventing pin withdrawal is provided. During actual use, the center terminal is formed by an in-mold process, and the insulating body assembly is made into a whole assembly, so that the bent section of the center terminal is completely wrapped in the insulating body. In this way, not only can the positioning of the insulating body assembly assembled into the main die-cast shell be ensured, but also, since there are no assembly clamping points on the surfaces of the center terminal and the insulating body, that is, there are no any assembly notches on the surfaces, it can effectively prevent the center terminal from withdrawing PIN or even loosening during repeated plugging and unplugging. The structural design is concise and reliable, without the need to additionally increase too much cost. In addition, the die-cast shielding body is designed as a split type, making the cross-section of the accommodating cavity of the metal shielding shell more approximate to a complete circle, controlling the distance change between the center terminal and the shielding layer, ensuring the stable transmission of coaxial signals. At the same time, the rear cover member is arranged on the rear side surface of the insulating body, comprehensively wrapping the center terminal, and playing a good shielding effect, improving the EMC performance of the product and the high-frequency bands it meets. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of a preferred embodiment of the present utility model.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of another angle of a preferred embodiment of the present utility model.

[0015] Figure 3 It is Figure 1 、 Figure 2 A sectional view taken along the center line of the preferred embodiment in

[0016] Figure 4Schematic diagram of the three-dimensional structure of the inner plastic component of the preferred embodiment of the present utility model.

[0017] Figure 5 Schematic diagram of the three-dimensional structure of the main housing of the die-casting part of the preferred embodiment of the present utility model.

[0018] Figure 6 Schematic diagram of the three-dimensional structure of the main housing of the die-casting part of the preferred embodiment of the present utility model from another perspective.

[0019] Figure 7 Schematic diagram of the three-dimensional structure of the rear cover part of the preferred embodiment of the present utility model.

[0020] Figure 8 Graph of the return loss obtained by high-frequency simulation of the RF connector of the preferred embodiment of the present utility model.

[0021] Figure 9 Graph of the voltage standing wave ratio obtained by high-frequency simulation of the RF connector of the preferred embodiment of the present utility model. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with the embodiments. The content mentioned in the embodiments is not a limitation to the present utility model.

[0024] As Figures 1 to 4As shown, a high-shielded RF connector 00 (hereinafter referred to as RF connector) for preventing pin withdrawal includes a die-cast shell 1 with a housing cavity 10, a center terminal 2 installed in the housing cavity 10, and an insulating body 3. The housing cavity 10 passes through a docking surface a facing the direction of the RF connector plug-in action and a mounting surface b facing the direction of the RF connector being installed on a printed circuit board. The center terminal 2 is an L-shaped machined part formed by a metal bar (such as a copper bar) through a bending process, and is composed of a plurality of cylindrical sections. The middle section has a large diameter and the two side sections have a small diameter, which is convenient for welding and tinning. In order to achieve high-quality transmission of RF signals, in the embodiment of the utility model, the center terminal 2 is a cylindrical bending part without assembly card points on the surface. The insulating body 3 is formed by wrapping the central terminal 2 through a metal mold forming process to form an inner plastic component 30, which is installed in the accommodating cavity 10 through an assembly process. More specifically, the insulating body 3 is wrapped around the middle section of the central terminal 2 to form a cylindrical curved surface without any assembly points on the outer surface. In this way, the accommodating cavity 10 of the set inner plastic component is always maintained as a cylindrical straight-through hole configured with a coaxial structure with the central terminal 2. According to the theory that the coaxial structure is easy to achieve excellent impedance matching, high-frequency characteristics are obtained, which improves the high-speed frequency band of product applications. It is worth noting that the structural design is simple and reliable, and does not require excessive additional costs.

[0025] Furthermore, the rear end portion of the die-cast main shell 1 is provided with a rear cover 12 which stops and limits the rear side of the insulating body 3. In this way, due to the bending structure of the center terminal 2, a strong joint is formed with the insulating body 3 as an integral part, and with the help of the rear end inner wall of the die-cast shell 1 and the rear cover 12 to block from the front and rear directions, the center terminal 2 is prevented from loosening and falling out of the structure as a whole, and the center terminal 2 is effectively and reliably prevented from moving backward after repeated plugging and unplugging, resulting in poor contact.

[0026] In this preferred embodiment, the RF connector 00 is a FAKRA connector for vehicle-mounted signal transmission. The mating surface of the die-casting main shell 1 is clamped with a plug-in plastic shell 4 with a plug-in hole 41. The front of the die-casting main shell 1 extends to the docking column 11 of the plug-in hole 41. The outer wall of the docking column 11 is radially surrounded by a protrusion and a buckle convex ring 110 is provided. The buckle convex ring 110 is clamped in the plug-in hole 41 by interference. This structure can easily realize direct clamping to complete fixed connection assembly, and has high reliability.

[0027] In this embodiment, the installation surface of the die-casting main shell 1 is provided with an upwardly extending limit groove 13 for the rear cover 12 to be inserted and installed. The limit groove 13 is connected to the accommodating cavity 10. The rear cover 12 is directly inserted from the lower side surface of the rear end of the die-casting main shell 1 to complete the assembly. The structure is simple and convenient to produce.

[0028] In this embodiment, at least one laterally extending snap-in boss 121 is provided on the side of the rear cover 12, and the matching snap-in slot and the snap-in boss 121 of the limiting groove 13 with an interference fit design are utilized to enhance the connection stability between the rear cover 12 and the die-cast main shell 1 after being matched.

[0029] Furthermore, the mounting surface of the die-casting main shell 1 is provided with an assembly curved surface 13a extending upward and connected to the limiting groove 13, which is combined with the assembly curved surface 12a provided on the rear cover 12 to form a cylindrical combined cavity 1a, which accommodates and limits the rear section of the insulating body 3 and is coaxially configured therewith, thereby realizing a fully enclosed shielding structure around the center terminal 2 and obtaining a superior EMC effect. Through the above configuration, further, in the cylindrical cavity area on the entire path from the docking surface to the mounting surface formed by the connection between the accommodating cavity 10 and the combined cavity 1a, the center line of the center terminal 2 coincides with the center line of the entire cylindrical cavity, which ensures that the entire signal transmission path of the entire center terminal 2 always maintains an equal distance from the grounded metal wall to which it is referenced, thereby obtaining superior or inferior RF indicators, see Figure 5 and Figure 6 As shown, its operating frequency is extended to 20GHz, which can meet the USCAR-17 standard. The VSWR standing wave ratio of the general traditional structure at 6GHz needs to meet 1.60, and the return loss needs to meet ≤-12.74dB. Therefore, under the same size requirements, the utility model can produce a higher frequency band than the existing product structure.

[0030] Furthermore, the rear cover 12 is a saddle-shaped metal structure, and the limit groove 13 extends upward to a depth exceeding the upper surface 10a of the accommodating chamber 10, so that the wall surface of the rear cover 12 and the rear wall surface of the accommodating chamber 10 form an effective fit. In this way, the area of ​​the limit metal part 12 is larger than the area of ​​the rear side surface of the rear end of the accommodating chamber 10 exposed to the outside, so that the upper part of the accommodating chamber 10 is completely shielded from the outside, achieving the best EMC effect.

[0031] In summary, the high-shielded RF connector for preventing pin withdrawal provided by the utility model has a simple and reliable structure, can effectively prevent the center terminal from loosening and falling out, and at the same time has excellent RF performance and exhibits quite outstanding EMC capabilities.

[0032] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0033] In addition, for the terms "first" and "second", they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise specifically defined. In the present utility model, unless otherwise clearly specified and limited, for the terms "assembled", "connected", "joined", they should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be internally connected and communicated between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The above-described embodiments only represent several implementation manners of the present utility model, and the description is relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A high-shield radio frequency connector for preventing pins from being pulled out, comprising a die-casting main shell having a receiving cavity penetrating a mating surface and a mounting surface, a central terminal installed in the receiving cavity, and an insulating body, characterized in that: The center terminal is a cylindrical bent part with no assembly points on the surface. The insulating body is wrapped around the center terminal through a metal mold forming process and installed in the accommodating cavity. The accommodating cavity is a cylindrical straight through hole that maintains a coaxial structure with the center terminal. The rear end of the die-cast main shell is provided with a rear cover part that stops and limits the rear side of the insulating body.

2. The high-shielded RF connector for preventing pin debonding according to claim 1, characterized in that: The docking surface of the die-casting main shell is clamped with a plug-in rubber shell with a plug-in hole. The front part of the die-casting main shell extends to the docking columnar part of the plug-in hole. The outer wall of the docking columnar part is radially surrounded by a protrusion to provide a snap-on convex ring, and the snap-on convex ring is interference-clamped in the plug-in hole.

3. The high-shielded RF connector for preventing pin debonding according to claim 1, characterized in that: The mounting surface of the die-casting main shell is provided with a limiting groove extending upward and communicating with the accommodating cavity, and the limiting groove is used for the rear cover to be inserted and mounted in the die-casting main shell.

4. The high-shielded RF connector for preventing pin debonding according to claim 3, characterized in that: The mounting surface of the die-casting main shell is provided with an assembly curved surface extending upward and connected to the limiting groove, which is combined with the assembly curved surface provided on the rear cover to form a cylindrical combined cavity, accommodating and limiting the rear section of the insulating body and being coaxially configured therewith.

5. The high-shielded radio frequency connector for preventing pin debonding according to claim 4, characterized in that: In a cylindrical cavity region formed by the communication between the accommodating cavity and the combined cavity on the entire path from the butt joint surface to the mounting surface, the center line of the central terminal coincides with the center line of the entire cylindrical cavity.

6. The high-shielded radio frequency connector for preventing pin debonding according to claim 4, characterized in that: The depth of the upward extension of the limiting groove exceeds the upper surface of the accommodating cavity, so that the wall surface of the rear cover and the rear wall surface of the accommodating cavity are effectively fitted.

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