Coaxial contact assembly

Abstract

A coaxial contact assembly comprises a first contact piece and a second contact piece which are matched with each other, the first contact piece comprises a first inner conductor and a first outer conductor, the second contact piece comprises a second inner conductor and a second outer conductor, and insulating media are arranged between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor. The first inner conductor is a spring needle, and the first outer conductor is an annular metal piece surrounding the spring needle; the second inner conductor is a columnar metal piece and is used for axially and elastically contacting with the spring needle, and the second outer conductor is a wire spring hole and is used for radially and elastically contacting with the annular metal piece. According to the utility model, the structure of the coaxial contact assembly is simplified, and miniaturization of the contact element is facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of coaxial connectors, and in particular relates to a coaxial contact component. Background Art

[0002] Coaxial contacts are commonly used in high-precision and high-reliability radio frequency transmission systems. They are combined with other structures (such as housings and insulators) to form mixed high- and low-frequency connectors or multi-core coaxial connectors. They are widely used in aerospace, communications, medical, rail transit, and industrial fields. With the advent of the big data era, various fields are pursuing miniaturized, integrated, and flexible equipment. The development of coaxial contacts is also showing a trend towards miniaturization and longer lifespan.

[0003] The existing high-life coaxial contacts have wire spring hole structures inside and outside. The basic components of high-frequency contacts are inner conductor, outer conductor surrounding the inner conductor, and insulating support for transmitting high-frequency signals (air can also be used as an insulating medium). Figure 1 As shown, the coaxial contact comprises a mating pin 1 and socket 2. Pin 1 has a pin inner conductor 101 and a pin cylindrical outer conductor 102, while socket 2 has a socket inner conductor 201 and a socket outer conductor 202. Both socket inner conductor 201 and socket outer conductor 202 are wire spring holes. When mated, the pin inner conductor 101 contacts the wire spring hole of the socket inner conductor 201, and the pin cylindrical outer conductor 102 contacts the wire spring hole of the socket outer conductor 202. The wires in the wire spring holes continuously provide reliable radial contact force to the pin.

[0004] Figure 1 The structure shown has the following disadvantages: (1) The degree of miniaturization of the wire spring hole is limited, and it is a multi-layer structure in the radial direction, which is not conducive to the miniaturization and integration of the contact parts; (2) After the contact parts are miniaturized, the wire spring wire of the wire spring hole is thin and fragile, and it is easy to break after repeated plugging and unplugging; (3) The pin and socket structure is complex, the processing efficiency is low, the process is complicated, and the cost is high. Utility Model Content

[0005] The purpose of the utility model is to provide a coaxial contact assembly, which optimizes the structure of the two contact pieces in the assembly, and replaces the wire spring hole of the inner conductor of the pin and the inner conductor of the socket by the elastic contact between the spring pin and the cylindrical metal piece, thereby simplifying the structure of the coaxial contact assembly and facilitating the miniaturization of the contact pieces.

[0006] In order to achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a coaxial contact assembly, including a first contact piece and a second contact piece that match each other, the first contact piece including a first inner conductor and a first outer conductor, the second contact piece including a second inner conductor and a second outer conductor, an insulating medium is provided between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor, the first inner conductor is a spring pin, and the first outer conductor is an annular metal piece surrounding the spring pin; the second inner conductor is a cylindrical metal piece for axially elastically contacting the spring pin, and the second outer conductor is a wire spring hole for radially elastically contacting the annular metal piece.

[0007] Furthermore, a spring pin support body is provided outside the spring pin.

[0008] Furthermore, the spring pin support body is a cylindrical structure and is provided with a mounting groove for accommodating the spring pin, and the contact pin head of the spring pin extends from the end of the mounting groove.

[0009] Furthermore, the spring pin is in close contact with the inner wall of the mounting groove of the spring pin support body.

[0010] Preferably, the insulating medium is an insulating support.

[0011] Alternatively, the insulating medium is air.

[0012] As an option, the annular metal member is a cylindrical structural member having a continuous cylindrical surface.

[0013] As another option, a plurality of notches are provided on the cylindrical surface of the annular metal member.

[0014] As another option, the annular metal member is composed of a plurality of arc-shaped metal sheets spaced apart along the same circumference.

[0015] The beneficial effects of the present invention are: 1. In the prior art, the inner conductor of the pin at the pin end has a variable diameter, and the contact with the inner conductor of the jack at the jack end requires the inner conductor of the pin to be inserted into the inner conductor of the jack, so it is a long-distance contact of a slender needle, which on the one hand affects the miniaturization of the axial size, and on the other hand requires high processing accuracy and assembly accuracy. Slight deflection or tilt during insertion will cause the pin to hit; in the present invention, the first contact piece is equivalent to the pin end, which adopts a spring pin as the inner conductor. The spring pin has no variable diameter, and the radio frequency transmission impedance is more stable. A columnar metal piece is provided on the second contact piece to elastically contact the spring pin in the axial direction, and it is an end-face contact. Therefore, it can not only achieve axial size compression to meet the needs of product miniaturization, but also reduce the product processing and assembly accuracy, with a certain radial tolerance, and can achieve end-to-end contact between the spring pin and the columnar metal piece even if deflection or tilt occurs during insertion.

[0016] 2. Compared with the prior art, the inner conductor of the present invention no longer adopts a multi-layer structure of wire spring holes, and thus can also achieve miniaturization in radial direction.

[0017] 3. The utility model installs a spring pin support body with a cylindrical structure outside the spring pin, which can move the fixed point of the front end of the spring pin forward and close to the end face of the first contact piece to avoid large radial vibration of the contact needle head of the spring pin under plug-in or vibration conditions, thereby ensuring more stable and reliable contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a coaxial contact in the prior art;

[0019] Figure 2 This is a schematic structural diagram of the coaxial contact assembly shown in Example 1 of the present utility model;

[0020] Figure 3 for Figure 2 A magnified view of the contact position of the middle contact component;

[0021] Figure 4 This is an enlarged view of the contact position of the coaxial contact assembly shown in Example 1 of the present utility model;

[0022] Markings in the figure: 1, pin, 101, pin inner conductor, 102, pin cylindrical outer conductor, 2, jack, 201, jack inner conductor, 202, jack outer conductor;

[0023] 3. First contact piece, 301. Spring pin, 302. Ring-shaped metal piece, 303. Spring pin support, 4. Second contact piece, 401. Columnar metal piece, 402. Spring hole, 403. Spring wire, 5. Insulating support. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0025] Example 1: Refer to the attached Figure 2 、 3As shown, a coaxial contact assembly includes a first contact member 3 and a second contact member 4 that mate with each other. The contact end of the first contact member 3, which is used for contact with the second contact member 4, is provided with a coaxially arranged first inner conductor and a first outer conductor, with the first outer conductor disposed around the first inner conductor. The contact end of the second contact member 4, which is used for contact with the first contact member 3, is provided with a coaxially arranged second inner conductor and a second outer conductor, with the second outer conductor disposed around the first inner conductor. An insulating medium is provided between the first inner conductor and the first outer conductor, and between the second inner conductor and the second outer conductor. In this embodiment, an insulating support 5 is used as the insulating medium. In other embodiments, air can also be used as the insulating medium.

[0026] In the first contact member 3, the first inner conductor is a spring pin 301, and the first outer conductor is an annular metal member 302 surrounding the spring pin 301. An insulating support 5 is disposed between the spring pin 301 and the annular metal member 302, with the spring pin 301 radially supported on the insulating support 5. The contact tip at the front end of the spring pin 301 is exposed from the insulating support 5, making contact with the second inner conductor. The annular metal member 302 is a metal cylinder with a continuous, closed cylindrical surface. The front end of the annular metal member 302 and the end surface of the insulating support 5 form a space for contacting the inner conductor.

[0027] The spring needle 301 includes a spring needle tube, a spring and a contact needle head. The spring and the contact needle head are installed in the spring needle tube. The tail end of the spring needle tube has a longer length for wiring.

[0028] In the second contact member 4, the second inner conductor is a cylindrical metal member 401 with a flat end surface, and the second outer conductor is a wire spring hole 402 surrounding the cylindrical metal member 401. When the second contact member 4 is mated with the first contact member 3, the cylindrical metal member 401 enters the inner conductor contact space and elastically contacts the spring pin 301 of the first contact member 3 in the axial direction. The wire spring hole 402 elastically contacts the outer side of the annular metal member 302 in the first contact member 3 in the radial direction via the wire spring wire 403.

[0029] The axial elastic contact means that when the first contact member 3 and the second contact member 4 are plugged into each other, after the cylindrical metal member 401 contacts the spring pin 301, the contact needle head of the spring pin 301 can be axially compressed and retreated, and the contact needle head squeezes the spring to generate an elastic force. Under the reaction of the elastic force, the cylindrical metal member 401 and the spring pin 301 are kept in reliable contact. The radial elastic contact means that when the first contact member 3 and the second contact member 4 are plugged into each other, the annular metal member 302 squeezes the spring wire 403, causing the spring wire 403 to deform radially. The elastic force generated by the deformation reacts on the annular metal member 302, thereby ensuring reliable contact between the annular metal member 302 and the spring hole 402.

[0030] As a variation of this embodiment, the annular metal member 302 may also be composed of a plurality of arc-shaped metal sheets spaced apart along the same circumference. In this case, the side surface of the annular metal member 302 is a discontinuous, unclosed cylindrical surface.

[0031] Alternatively, a plurality of notches are provided on the cylindrical surface of the annular metal member 302 , and in this case the cylindrical surface is also a discontinuous and unclosed cylindrical surface.

[0032] Example 2: In Example 1, the spring needle tube of the spring needle 301 is directly installed in the insulating support 5. In this case, a convex bump is provided on the surface of the spring needle tube, which serves as a fixed point of contact with the insulating support 5. The spring needle tube is generally stamped. When providing the convex bump, in order to prevent it from affecting the rebound of the contact needle, it is necessary to place the convex bump behind the contact needle. This makes the fixed point farther from the end face of the first contact member 3, resulting in a larger swing amplitude of the contact needle at the front end of the spring needle 301. In addition, the convex bump and the insulating support 5 are in point contact. The interference fit between the convex bump and the insulating support 5 must be strictly controlled, otherwise the spring needle 301 may slip, affecting the contact with the second contact member 4.

[0033] In order to further solve the above problem, a preferred solution of Example 2 is proposed based on Example 1.

[0034] This embodiment is similar to Embodiment 1. The coaxial contact assembly includes a first contact member 3 and a second contact member 4 that mate with each other. The contact end of the first contact member 3 is provided with a coaxially arranged first inner conductor and a first outer conductor, with the first outer conductor disposed around the first inner conductor. The contact end of the second contact member 4 is provided with a coaxially arranged second inner conductor and a second outer conductor, with the second outer conductor disposed around the first inner conductor. Insulating supports 5 are provided as insulating media between the first inner conductor and the first outer conductor, and between the second inner conductor and the second outer conductor.

[0035] like Figure 4 As shown, in the first contact member 3, the first inner conductor is a spring pin 301, and the first outer conductor is an annular metal member 302 surrounding the spring pin 301. An insulating support 5 is disposed between the spring pin 301 and the annular metal member 302. A spring pin support 303 is disposed outside the spring pin 301. The spring pin support 303 has a cylindrical structure, and the outer side of the spring pin support 303 is in contact with the inner side of the insulating support 5. The spring pin support 303 is provided with a mounting groove for accommodating the spring pin 301. The contact tip of the spring pin 301 extends from the end of the mounting groove for contacting the second inner conductor.

[0036] In this embodiment, after the spring pin support body 303 is provided, barbs are provided on the outer surface of the spring pin support body 303. The barbs are fixed to the insulating support body 5, thereby securing the spring pin to the insulating support body 5. Therefore, the barbs on the spring pin support body 5 can be positioned forward of the contact pin head, so that the fixed position of the spring pin 301 is closer to the end face of the first contact member 3. This can reduce the swing amplitude of the spring pin 301 and ensure reliable and stable contact between the spring pin 301 and the second inner conductor. The annular metal member 302 is a metal cylinder with a continuous, closed cylindrical surface. The front end of the annular metal member 302 and the end face of the insulating support body 5 enclose an inner conductor contact space.

[0037] The structure of the second contact member 4 in this embodiment is the same as that in the first embodiment.

[0038] In the above two embodiments, the first contact member 3 is a pin connector, and the second contact member 4 is a socket connector.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the specific implementation methods of the present invention can be modified or replaced with equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A coaxial contact assembly, comprising a first contact member (3) and a second contact member (4) that are mated with each other, wherein the first contact member (3) comprises a first inner conductor and a first outer conductor, and the second contact member (4) comprises a second inner conductor and a second outer conductor, and an insulating medium is provided between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor, characterized in that: The first inner conductor is a spring needle (301), and the first outer conductor is an annular metal part (302) surrounding the spring needle (301); the second inner conductor is a columnar metal part (401) for axial elastic contact with the spring needle (301), and the second outer conductor is a wire spring hole (402) for radial elastic contact with the annular metal part (302).

2. A coaxial contact assembly according to claim 1, characterized in that: A spring pin support body (303) is provided outside the spring pin (301).

3. A coaxial contact assembly according to claim 2, characterized in that: The spring pin support body (303) is a cylindrical structure and is provided with a mounting groove for accommodating the spring pin (301), and the contact needle head of the spring pin (301) extends from the end of the mounting groove.

4. The coaxial contact assembly according to claim 3, characterized in that: The spring pin (301) is in close contact with the inner wall of the mounting groove of the spring pin support body (303).

5. The coaxial contact assembly according to claim 1, characterized in that: The insulating medium is an insulating support (5).

6. The coaxial contact assembly according to claim 1, characterized in that: The insulating medium is air.

7. The coaxial contact assembly according to claim 1, characterized in that: The annular metal part (302) is a cylindrical structural part with a continuous cylindrical surface.

8. The coaxial contact assembly according to claim 1, characterized in that: A plurality of notches are provided on the cylindrical surface of the annular metal piece (302).

9. The coaxial contact assembly according to claim 1, characterized in that: The annular metal piece (302) is composed of a plurality of arc-shaped metal sheets distributed at intervals along the same circumference.

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