CN217114737U

CN217114737U - High-reliability coaxial switch contact structure

Info

Publication number: CN217114737U
Application number: CN202122873680.6U
Authority: CN
Inventors: 戴林华; 刘士成
Original assignee: SHANGHAI HUAXIANG COMPUTER COMMUNICATION ENGINEERING CO LTD
Current assignee: SHANGHAI HUAXIANG COMPUTER COMMUNICATION ENGINEERING CO LTD
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-08-02
Anticipated expiration: 2031-11-22

Abstract

The utility model discloses a high reliable coaxial switch contact structure, it includes: the coaxial connector comprises a cavity assembly, a coaxial connector, an inner conductor and a driving assembly; a first mounting cavity and two second mounting cavities are formed in the cavity assembly, the coaxial connectors are respectively mounted in the two second mounting cavities, and a contact on each coaxial connector extends into the first mounting cavity; the inner conductor is movably arranged in the first arranging cavity, the driving assembly is arranged on the cavity assembly and is in driving connection with the inner conductor in the first arranging cavity, and the driving assembly can drive the inner conductor to move relative to the coaxial connector. The utility model provides a technical scheme can improve coaxial switch's contact reliability, optimizes repeatability index in the whole product life cycle to can effectively overcome the problem that prior art exists.

Description

High-reliability coaxial switch contact structure

Technical Field

The utility model relates to a microwave circuit technique, concretely relates to radio frequency coaxial switch technique.

Background

The radio frequency coaxial switch is mainly applied to the microwave high-frequency field, can be controlled through voltage or automation to play a role in signal switching in a microwave circuit, and transmits signals from a measuring instrument to equipment to be tested (DUT).

Generally, the contact structure of the radio frequency coaxial switch is line contact or surface contact, and the contact points are few and limited. When the resistance of the individual contact points increases, the total contact resistance of the contacts is greatly changed. This phenomenon can seriously interfere with the repeatability and consistency of the radio frequency indicator. Especially for calibration systems, the validity of the data is directly affected.

Therefore, a radio frequency coaxial switch contact structure capable of improving the precision of automatic data acquisition and measuring the repeatability of a calibration system is particularly needed to make up for the phenomenon that the repeatability and consistency test of the existing microwave coaxial switch are not accurate enough.

Therefore, how to effectively improve the reliability of the coaxial switch contact is a technical problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

To the problem that exists in the aspect of the current coaxial switch in the reliability, the utility model aims to improve a highly reliable coaxial switch contact structure, this coaxial switch contact structure can improve the contact reliability to can effectively overcome the problem that prior art exists.

In order to achieve the above object, the utility model provides a pair of high-reliability coaxial switch contact structure, include: the coaxial connector comprises a cavity assembly, a coaxial connector, an inner conductor and a driving assembly; a first mounting cavity and two second mounting cavities are formed in the cavity assembly, and the two second mounting cavities are distributed at two ends of the first mounting cavity and are respectively communicated with the first mounting cavity; the coaxial connectors are respectively arranged in the two second arranging cavities, and the contact on each coaxial connector respectively extends into the first arranging cavity; the inner conductor is movably arranged in the first arranging cavity, the driving assembly is arranged on the cavity assembly and is connected with the inner conductor in the first arranging cavity in a driving mode, and the driving assembly can drive the inner conductor to move relative to the coaxial connector to enable the inner conductor to change between a closed state contacting with the coaxial connector and an open state not contacting with the coaxial connector.

Further, two second installation cavities in the cavity assembly are distributed perpendicular to the first installation cavity.

Furthermore, the inner conductor comprises a conductor body, and a plurality of contact claws are formed at two ends of the conductor body respectively.

Furthermore, the plurality of contact claws are distributed in parallel.

Furthermore, drive assembly includes the push rod, the push rod can be movable wear to establish in the cavity subassembly, and one end stretches into the first arrangement intracavity in the cavity subassembly and is connected with the inner conductor.

Further, the drive assembly further comprises a restoring member, and the restoring member is arranged between the push rod and the cavity assembly.

The utility model provides a technical scheme can improve coaxial switch's contact reliability, optimizes repeatability index in the whole product life cycle to can effectively overcome the problem that prior art exists.

Further, the utility model discloses an in the scheme, its inner conductor head adopts the tooth claw structure, but every tooth claw independent contact coaxial connector, and the contact of every tooth claw and the contact point of coaxial connector inner conductor terminal surface more, single contact change influences total contact resistance little to improve contact resistance's reliability effectively.

Drawings

The invention is further described with reference to the following drawings and detailed description.

Fig. 1 is a diagram showing an example of the structure of a highly reliable coaxial switch contact structure in this example;

FIG. 2 is a diagram showing an example of the structure of the inner conductor in this example;

FIG. 3 is a microscopic view of the surface of the stationary contact of the coaxial connector in this example;

fig. 4 is an equivalent circuit diagram of the multi-claw inner conductor in the present example.

The parts in the drawings are marked below

Cavity assembly 101, coaxial connector 102, inner conductor 103.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1, there is shown a general schematic diagram of the switch contact structure given in this example.

As can be seen, the switch contact structure 100 of the present example includes: a cavity assembly 110, a coaxial connector 120, an inner conductor 130, and a drive assembly 140.

The cavity assembly 110 constitutes a main structure of the whole structure, and is used for bearing other components and forming a corresponding contact working area.

Specifically, the chamber body assembly 110 includes a chamber body assembly body 111, the chamber body assembly body 111 is formed by combining corresponding connection blocks, and a first installation cavity 112 and two

second installation cavities

113 and 114 are formed in the middle.

The first receiving chamber 112 is used for receiving the inner conductor 130 and forms a corresponding contact active area. The first housing cavity 112 is sized and shaped to mate with the inner conductor 130, and the inner conductor 130 is received therein and is capable of moving within the first housing cavity 112.

Here, two

second housing cavities

113, 114 are distributed below both ends of the first housing cavity 112 and respectively communicate with the first housing cavity 112 for housing respective coaxial connectors 120.

In some embodiments, the

second housing cavities

113 and 114 are identical in structure and are disposed perpendicular to the two ends of the first housing cavity 112.

Further, the two

second housing cavities

113 and 114 are distributed at two ends of the first housing cavity 112 in a symmetrical structure.

On this basis, the second housing chamber is preferably a counterbore structure, the main body component of the coaxial connector 120 is mounted through the large hole portion of the counterbore structure, and meanwhile, the small hole portion of the counterbore structure allows the contact portion 121 on the coaxial connector 120 to penetrate through so as to extend into the first housing chamber 112, so that the reliability and stability of the mounting structure of the coaxial connector 120 can be effectively ensured.

In cooperation therewith, the coaxial connectors 120 in this example are respectively disposed in the

second disposition chambers

113 and 114, and the contact portions 121 thereof respectively pass through the small hole portions of the second disposition chambers to project into the first disposition chamber 112 to form corresponding stationary contacts.

Preferably, the coaxial connectors 120 are each threadably secured to the second mounting cavity, which facilitates installation and subsequent maintenance replacement.

Further, the contact portion 121 of the coaxial connector 120 is made of a copper-based alloy, and the top surface is in a smooth, flat, and non-plated state, thereby forming a stationary contact.

The inner conductor 130 in this example is movably disposed in the first housing cavity 112 of the housing assembly 110 and is movable back and forth relative to the coaxial connectors 120 in the second housing cavity to simultaneously contact and disconnect the contact portions of the coaxial connectors 120 extending into the first housing cavity 112.

When the two ends of the inner conductor 130 are respectively contacted with the contact parts on the two coaxial connectors 120, the two coaxial connectors 120 are communicated and are in a closed state;

when both ends of the inner conductor 130 are not in contact with the upper contact portions of the coaxial connectors 120, the coaxial connectors 120 are disconnected and opened.

Referring to fig. 2, a specific configuration example of the inner conductor 130 in this example is shown.

As shown, the inner conductor 130 mainly includes a conductor body 131 and a plurality of contact fingers 132 disposed at two ends of the conductor body 131.

Among them, the conductor body 131 is preferably made of a copper-based alloy while the surface is in a smooth and flat, non-plated state.

Further, the conductor body 131 is a square plate structure, and a central hole 133 is formed in the middle of the conductor body for connecting with the driving component 140.

The two ends of the conductor body 131 are respectively distributed with a plurality of contact claws 132 extending outwards to form corresponding moving contacts at the two ends, and the moving contacts can be correspondingly matched with the fixed contacts on the coaxial connector 120. The conductor body 131 may be in contact engagement with a stationary contact on the coaxial connector 120 as it moves within the first seating cavity toward the coaxial connector 120.

Specifically, in this example, the plurality of contact claws 132 at both ends of the conductor body 131 are preferably integrally formed at both ends of the conductor body 131, that is, formed by extending both ends of the conductor body 131 directly outward.

The contact claws 132 formed at each end of the conductor body 131 are distributed side by side in sequence and have the same size and structure.

By way of example, each contact finger 132 in the illustrated embodiment is an elongated structure with a U-shaped gap between adjacent contact fingers 132.

Furthermore, each contact pawl 132 is independently arranged and has a corresponding rack structure, so that each contact pawl 132 can deform relative to the conductor body 131 to improve the reliability of subsequent contact.

The number of the contact claws 132 formed at each end of the conductor body 131 is not limited herein and may be determined according to actual needs.

By way of example, the conductor body 131 in the illustrated embodiment is formed with four contact fingers 132 at each end, and the four contact fingers 132 are arranged side by side in the end of the conductor body 131 at equal intervals.

With this arrangement, each of the contact claws 132 at both ends of the conductor body 131 independently forms one movable contact, so that a plurality of independent movable contacts are formed at both ends of the conductor body 131, respectively. Meanwhile, since each contact claw 132 can be deformed to some extent based on its own structure, the reliability of contact between the two can be improved by deformation when in contact with a stationary contact on the coaxial connector 120.

When the inner conductor 130 formed in this way is matched with a coaxial connector, each contact tooth claw 132 can be separately matched with a stationary contact on the coaxial connector in a contact way through the plurality of contact tooth claws 132 formed at the two ends of the inner conductor 130, compared with the prior art, the scheme has the advantages that the contact points of the inner conductor 130 and the coaxial connector are more, the structural strength of each contact tooth claw 132 is improved, and the contact pressure is enhanced; and the change of the single contact has little influence on the total contact resistance, thereby improving the reliability and the repeatability of the contact resistance.

Some improvements are also provided here with respect to the above-described arrangement of the inner conductor 130.

For the contact fingers 132 at both ends of the inner conductor 130, each contact finger 132 may be designed in a circular arc shape, which may facilitate the operation and improve the contact sensitivity.

Alternatively, as for the contact claws 132 at both ends of the inner conductor 130, a contact bump may be formed on the contact surface of each contact claw 132.

The driving assembly 140 in this example, which is specifically disposed on the cavity assembly 110 and drivingly connected to the inner conductor 130 disposed in the first disposition chamber, can drive the inner conductor 130 to move relative to the coaxial connector 120 within the first disposition chamber 112, so that the inner conductor 130 can be changed between a closed state contacting the coaxial connector 120 and an open state not contacting the coaxial connector 130.

Specifically, the driving assembly 140 is formed by a driving rod 141 and a restoring spring 142, wherein the driving rod 141 penetrates through the cavity assembly 110, and the top end of the driving rod 141 extends into the first accommodating cavity in the cavity assembly 110 and is matched with the hollow hole 133 on the inner conductor 130 to realize the fixed connection with the inner conductor 130.

The driving rod 141 can move back and forth relative to the first positioning cavity in the cavity assembly 110, and then the inner conductor 130 can be driven to move back and forth in the first positioning cavity 112.

In particular implementations, the driving rod 141 is preferably of a T-shaped configuration in cross-section, so as to cooperate with the return spring 142.

The restoring spring 142 of the driving assembly 140 is sleeved on the driving rod 141, one end of the restoring spring abuts against the top end of the driving rod 141, and the other end of the restoring spring abuts against the cavity assembly 110. The restoring spring 142 is compressed when the driving rod 141 drives the inner conductor 130 to move, and then forms restoring elastic force to the driving rod 141, and when the driving rod 141 does not drive to move, the restoring spring 142 drives the driving rod 141 to drive the inner conductor 130 to restore to the original state.

Taking the illustrated embodiment as an example, when the driving rod 141 is subjected to an external force to drive the inner conductor 130 to move toward the coaxial connector 120, the restoring spring 142 is synchronously compressed; thus, when the driving rod 141 is no longer subjected to external force, the restoring spring 142 drives the driving rod 141 to drive the inner conductor 130 to move back to the coaxial connector 120 by its own elastic force, and restores to the initial position.

Preferably, the restoring spring 142 is in a pre-pressed state when it is sleeved on the driving rod 141.

In addition, the restoring spring 142 may be replaced with other elastic members.

Furthermore, in order to match the arrangement of the driving component 140, the arrangement groove 115 is formed in the middle region of the top of the cavity component body 111, so that the whole structure is compact and reliable.

In the high-reliability coaxial switch contact structure formed thereby, the driving rod 141 in the cavity assembly 110 is subjected to an external force to make the inner conductor 130 move towards the coaxial connector 120, so that the plurality of moving contacts at the two ends of the inner conductor 130 can respectively and synchronously contact the end faces (i.e. the stationary contacts) of the inner conductors on the two coaxial connectors; the non-contact state is an open state, and the contact state is a closed state.

Therefore, the function of switching signals of the radio frequency coaxial switch is realized through the contact movement matching. When the movable contact (inner conductor) and the fixed contact (inner conductor end face of the coaxial connector) are closed, the signal is transmitted. Conversely, when open, the signal is off.

In practical application, the contact resistance is related to contact material, contact structure and contact coating. The performance of the contact structure is improved, and the corresponding contact is formed on the basis of a copper-based alloy (such as lead brass) in a non-plating state in the embodiment.

Still further, referring to fig. 3, the surface of the stationary contact of the coaxial connector is finely ground, and is very flat in surface view and rugged in microscopic view, and in the theory of electric contact, the actual contact points are generally only a few, so that the contact resistance is generated on the contact surface, and when the resistance of one of the contact points becomes large, the influence on the total contact resistance is large.

In contrast, in this embodiment, both ends of the inner conductor 130 are formed by using a plurality of contact claws, respectively. Thus when jaw contact is used, the actual contact points are distributed over each jaw. Some micro-motion change of the contact position can be generated between each tooth claw due to the stress. Therefore, the distribution mode of the contact stress of the whole inner conductor is changed, and the actual contact point is increased due to the elastic micro-motion change. By the number of contact points, the contact resistance is reduced.

As shown in fig. 4, assuming that each contact point is equivalent to a group of parallel circuits, according to the analysis of the parallel resistance formula 1/R total ═ 1/R1+1/R2+ … … +1/Rn, it can be known that when the parallel resistance is more, the total contact resistance is smaller, and at the same time, the influence of the resistance change of a single contact point on the total contact resistance is smaller.

The operation of the above-mentioned high-reliability coaxial switch contact structure will be exemplified below.

In the high-reliability coaxial switch contact structure 100, under the action of the restoring spring 142, the driving rod 141 drives the inner conductor 130 to be far away from the coaxial connector 120, the movable contacts at the two ends of the inner conductor 130 are separated from the fixed contacts on the coaxial connector 120 and are not in contact with each other in the state, and the whole structure is in an open circuit state.

The external force is applied to press the driving rod 141, so that the driving rod 141 moves downwards, and at the moment, the driving rod 141 drives the inner conductor 130 to move towards the coaxial connector 120 and synchronously compress the recovery spring 142;

when the driving rod 141 moves downwards for a certain distance, the two ends of the inner conductor 103 are contacted with the static contact points on the end surfaces of the inner conductors of the two coaxial connectors respectively by the movable contact points formed by the contact tooth claws 132, and the whole structure is in a closed state at the moment, so that information is transmitted mutually.

When the external force is removed, the restoring spring 142 begins to extend, drives the driving rod 141 to move upwards in a restoring manner, and simultaneously drives the inner conductor 130 to move back to the coaxial connector 120 and restore to the initial state, so that the movable contacts at the two ends of the inner conductor 130 are separated from the fixed contacts on the coaxial connector 120 and are not in contact, and the whole structure is in an open circuit state.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. Highly reliable coaxial switch contact structure, its characterized in that includes: the coaxial connector comprises a cavity assembly, a coaxial connector, an inner conductor and a driving assembly; a first mounting cavity and two second mounting cavities are formed in the cavity assembly, and the two second mounting cavities are distributed at two ends of the first mounting cavity and are respectively communicated with the first mounting cavity; the coaxial connectors are respectively arranged in the two second arranging cavities, and the contact on each coaxial connector respectively extends into the first arranging cavity; the inner conductor is movably arranged in the first arranging cavity, the driving assembly is arranged on the cavity assembly and is connected with the inner conductor in the first arranging cavity in a driving mode, and the driving assembly can drive the inner conductor to move relative to the coaxial connector to enable the inner conductor to change between a closed state contacting with the coaxial connector and an open state not contacting with the coaxial connector.

2. The highly reliable coaxial switch contact structure according to claim 1, wherein two second housing cavities in the cavity block are distributed perpendicular to the first housing cavity.

3. The structure of claim 1, wherein the inner conductor comprises a conductor body, and a plurality of contact fingers are formed at two ends of the conductor body respectively.

4. The structure of claim 3, wherein said plurality of contact fingers are arranged in parallel.

5. The high-reliability coaxial switch contact structure according to claim 1, wherein the driving assembly comprises a push rod movably inserted into the cavity assembly, and one end of the push rod extends into the first accommodating cavity of the cavity assembly and is connected with the inner conductor.

6. The highly reliable coaxial switch contact structure of claim 5, wherein the drive assembly further comprises a restoring member disposed between the push rod and the cavity assembly.