CN209766261U - Contact assembly and switch - Google Patents

Abstract

The utility model relates to a switch, especially make-before-break type switch product. The utility model provides a contact assembly, touch including two at least connecting terminals, two at least springs and indicate and a conductive shaft, connecting terminal is including being used for emboliaing the sleeve part of grafting conductive shaft, touch through this spring between the internal surface of connecting terminal's sleeve part and the surface of conductive shaft and indicate to realize that physical contact and electricity communicate to be connected, the wire winding coil that the spring touched the finger adopts asymmetric shape. The utility model discloses still provide a switch, include as above the contact assembly. The utility model is used for the occasion of uninterrupted power system's power supply is used.

Description

Contact assembly and switch

Technical Field

The present invention relates to a switch, and more particularly, to a switch product of a make-before-break type, and more particularly, to an improvement in the structure of a contact portion of a switch.

Background

In some applications, the reliability of the electronic system is important, and in order not to interrupt the power supply to the subsystem, a switch product of the make-before-break type is used. For example, CN107910213A and CN107818898A are both proposed solutions for such switches. Although the spring contact fingers are adopted in both switches to realize reliable connection of the contact parts, some technical defects still exist and need to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical weak point to prior art's switch proposes the improvement, and the event has following technical scheme to propose:

as one of the purposes of the present invention, a contact assembly is provided, which comprises at least two connecting terminals, at least two springs, a conductive shaft, and a sleeve part for being sleeved on the conductive shaft, wherein the inner surface of the sleeve part of the connecting terminal and the outer surface of the conductive shaft are connected through the spring, and the spring is connected to the winding coil in an asymmetric shape.

As a second object of the present invention, a switch is provided, comprising the contact assembly as described above.

the utility model discloses an as above technical scheme has technical effect: 1. the contact stress is constant, and the electric performance is stable. 2. Has self-cleaning function and long service life. 3. Easy manufacture and simple and convenient assembly process.

Drawings

Fig. 1 is a front view of a preferred embodiment of the present invention;

FIG. 2 is a side view of this embodiment;

FIG. 3 is a sectional view of the embodiment taken along line A-A of FIG. 1;

FIG. 4a is a front view of the spring finger of this embodiment;

FIG. 4b is a side view of the spring finger of this embodiment;

FIG. 5a is a schematic view of a first configuration of one of the wire coils of the spring finger of the present embodiment;

FIG. 5b is a schematic diagram of a second configuration of one of the wire coils of the spring finger of this embodiment;

FIG. 5c is a schematic view of a third configuration of one of the wire coils of the spring finger of this embodiment;

FIG. 6 is a diagram illustrating the embodiment in state one when switching;

FIG. 7 is a diagram illustrating the second state of the embodiment during handover;

fig. 8 is a schematic diagram of state three when the embodiment performs handover.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Example 1:

referring to fig. 1-3, the embodiment discloses a contact assembly, which includes a connection terminal 1, a spring contact finger 2 and a conductive shaft 3, wherein the number of the connection terminal 1 is 3, the connection terminal 1 includes a sleeve portion 11 for being sleeved with the conductive shaft 3 and a terminal portion 12 for connection; wherein the inner surface of the sleeve part 11 of the connection terminal 1 and the outer surface of the conductive shaft 3 are connected in physical contact and electrical communication through the spring contact finger 2. Of course, the connection terminal 1, the spring finger 2 and the conductive shaft 3 are made of a conductor that can satisfy reliable conduction. In order to achieve good conductive capability, the connection terminal 1 and the conductive shaft 3 can be made of copper or copper alloy; under the application of special occasions, a silver layer or a gold layer can be plated on the contact surface of the conductive film to further enhance the conductive capability of the conductive film.

Specifically, in this embodiment, 4 annular grooves 31 are respectively formed in the conductive shaft 3, and 4 spring fingers 2 are respectively sleeved in the 4 annular grooves 31 and are slightly exposed to be higher than the outer surface of the conductive shaft 3, so as to ensure reliable contact with the inner surface of the sleeve portion 11 of the connection terminal 1. Referring to fig. 4a and 4b, the spring contact finger 2 is a circular ring formed by connecting the tail end of the wound spring in a closed manner, wherein the spring contact finger 2 is made of an elastic material with conductivity, preferably a metal material; preferably, in order to take conductivity and elasticity into consideration, the spring contact finger 2 can be made of beryllium bronze wire, cobalt beryllium copper wire, zirconium bronze wire or the like.

In this embodiment, the cross section of the annular groove 31 on the conductive shaft 3 may be in the shape of an arc, a V, a wedge, etc., as long as the shape that at least 2 points of support are provided for the spring contact finger 2 on the cross section is suitable, the purpose of the annular groove 31 is to make the spring contact finger 2 receive at least 2 acting forces to support in the groove, and the support force directions of the supports converge towards the middle of the winding coil 21 of the spring contact finger 2, and the stability of the winding coil 21 of the spring contact finger 2 can be better maintained in cooperation with the structure of the winding coil 21. Wherein the spring finger 2 of this embodiment is different from a conventional round wire-wound coil as employed in CN107910213A and CN107818898A (a conventional spring finger means that the wire springs of a general round wire-wound coil are connected end to end in a closed loop or arranged in a spiral winding), the wire-wound coil 21 of the spring finger 2 of this embodiment is an asymmetric shape, i.e., the outer periphery of the shape is not equal everywhere from the center. It should be noted that the asymmetric shape of the wire-wound coil 21 of the spring finger 2 in this embodiment refers to the original shape of the wire-wound coil 21 in the initial state, not the external shape caused by deformation under pressure. As shown in fig. 5a-5c, for example, the embodiment is preferably elliptical, so that when compressed by both the connection terminal 1 and the conductive shaft 3, at least the winding coil is deformed to better abut between the connection terminal 1 and the conductive shaft 3, thereby ensuring the reliability of the conductive connection. More preferably, the oval winding coil 21 is obliquely arranged as shown in fig. 5b and 5c, so that each winding coil is individually deformed due to the oval winding coil, no matter which part of which turn is deformed, and the oval winding coil is asymmetrically arranged, the winding coil of the turn is stressed towards the center of the winding coil but obliquely stressed, and the oblique stress of the winding coil of the turn can transfer the torsion force of the winding coil to the winding coils adjacent to two ends of the winding coil, so that the whole spring contact finger 2 performs a chain reaction, thereby finally realizing load uniformity at each contact point, having a self-adjusting correcting effect, and making the conductive connection between the connection terminal 1 and the conductive shaft 3 very reliable.

It should be noted that, according to the difference of the current load loaded between the connection terminal 1 and the conductive shaft 3, the sizes of the spring fingers 2 and the corresponding annular grooves 31 can be adjusted and changed accordingly to match the performance requirements.

in the embodiment, the spring contact finger 2 is used for connecting the conductive shaft 3 and the lead terminal 1, so that more contact points between the conductive shaft 3 and the lead terminal 1 can be ensured, the contact performance is small, the conductivity is good, the voltage drop is small, and the allowed current density is high; meanwhile, because the contact points are many, the embodiment has the technical advantages of high current capacity, high electric and thermal stability, uniform electric field distribution, constant contact stress, small abrasion, long service cycle and capability of being plugged and unplugged for thousands of times. In addition, the structural parts of the embodiment are simple, the assembly process is simple, and the method is suitable for mass production.

referring to fig. 3, in this embodiment, 4 annular grooves 31 on the conductive shaft 3 are arranged in parallel at equal intervals, and the adjacent distance is L1, and the length L2 of 3 connection terminals 1 is greater than L1. Referring to fig. 6-8, this embodiment is shown in three states when switching, as can be seen: this embodiment can realize that 2 connecting terminals switch on and 3 connecting terminals 'three-point-through function through 4 spring contact finger's reasonable arrangement. This embodiment achieves the shortest switching time and the most reliable three-point connectivity. It should be noted that, in this embodiment, the 4 annular grooves 31 on the conductive shaft 3 are arranged in parallel with each other at equal intervals, but in other designs, they may be arranged at unequal intervals and/or in non-parallel, and the above-mentioned electric function can be achieved as long as the length of the shortest one of the connection terminals is greater than the maximum interval of the adjacent annular grooves on the conductive shaft.

referring to fig. 1 and 2 again, unlike the same side arrangement of CN107910213A and CN107818898A, in this embodiment, the leading end portions 12 of the 3 connection terminals 1 sleeved on the conductive shaft 3 can be located on different sides respectively, and are avoided from each other, so as to have a larger connection space and be more convenient to use.

Example 2:

This embodiment 2 is substantially the same as embodiment 1 above except that: the conductive shaft is smooth and flat, is not provided with an annular groove, and is replaced by an annular groove for a spring contact finger to be sleeved in; the spring fingers are fixed in a similar manner to CN107910213A and CN107818898A, for reference. Since embodiment 2 adopts a structure equivalent to that of embodiment 1, embodiment 2 also has the same technical effects as those of the corresponding improvements of embodiment 1, and will not be described herein again.

Example 3:

This embodiment discloses a switch comprising the contact assembly of embodiment 1 or embodiment 2, and further comprising other components, such as an insulating sleeve, a switching device, etc., which may be adjusted slightly according to actual needs, and all known structures of such switches may be adopted, for example, refer to the disclosure in CN107910213A and CN 107818898A. Since the switch of this embodiment is the subject of the prior art except for the improvement of the contact assembly, it will not be described herein.

In the switch of this embodiment, since the contact assembly of embodiment 1 or embodiment 2 is used, the embodiment inevitably has the same technical effect as that described in embodiment 1 and embodiment 2, and the detailed description thereof is omitted.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A contact assembly comprises at least two connecting terminals, at least two spring contact fingers and a conductive shaft, and is characterized in that: the connecting terminal comprises a sleeve part which is used for being sleeved with the inserted conductive shaft, the inner surface of the sleeve part of the connecting terminal and the outer surface of the conductive shaft are in physical contact and electric connection through the spring contact finger, and the winding coil of the spring contact finger is in an asymmetric shape.

2. The contact assembly of claim 1, wherein: the wire winding coil of the spring contact finger is oval.

3. the contact assembly of claim 1 or 2, wherein: the spring contact fingers are arranged obliquely.

4. the contact assembly of claim 1, wherein: the conductive shaft is provided with annular grooves corresponding to the number of the spring contact fingers, and the spring contact fingers are sleeved in the annular grooves.

5. The contact assembly of claim 4, wherein: the length of the shortest one of the plurality of connection terminals is greater than the maximum spacing distance of adjacent annular grooves on the conductive shaft.

6. the contact assembly of claim 5, wherein: the plurality of annular grooves on the conductive shaft are arranged in parallel with each other at equal intervals.

7. The contact assembly of claim 4, wherein: the shape of the annular groove is configured to adopt a profile that satisfies at least 2 point support in cross-section for the spring finger.

8. the contact assembly of claim 7, wherein: the supporting force orientation of the at least 2-point support is converged towards the middle of the winding coil of the spring contact finger.

9. The contact assembly of claim 1, wherein: the connection terminal further includes a terminal portion for connection, and the terminal portions of the plurality of connection terminals are located on different sides, respectively.

10. A switch, characterized by: comprising a contact assembly according to any of the preceding claims 1-9.