CN219759392U - Contact finger and corresponding electrical switch - Google Patents
Contact finger and corresponding electrical switch Download PDFInfo
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- CN219759392U CN219759392U CN202321168891.2U CN202321168891U CN219759392U CN 219759392 U CN219759392 U CN 219759392U CN 202321168891 U CN202321168891 U CN 202321168891U CN 219759392 U CN219759392 U CN 219759392U
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- contact
- finger
- opening
- fingers
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- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The disclosure proposes a contact finger, slidingly connected with a contact, characterized by comprising a base, the center of which comprises an opening for fixing the contact finger; a plurality of said fingers are distributed about said opening and extend from said base, each said finger having at least two sub-fingers, each sub-finger including a contact section in contact engagement with said contact. An electrical switch comprising the contact finger and a corresponding contact is also proposed.
Description
Technical Field
The disclosure relates to the field of electrical devices, in particular to a finger device and a corresponding electrical switch.
Background
The contact and the contact finger are very critical parts for electrical connection, and influence various electrical performances of the electrical switching apparatus, such as insulation, temperature rise, dynamic thermal stability and the like. The contact and finger may be used in electrical sliding connection applications for electrical switching apparatus, which are the primary sites for loss of energy consumption in the switching apparatus.
In order to reduce the contact resistance of the electrical connection, the existing contact finger design often increases the number of contact fingers or increases the holding force of the contact fingers. In a limited space, the number of the contact fingers is limited by the space size, and the increase of the holding force is limited on the reduction of the contact resistance, and when the holding force is increased to a certain value, the contact resistance is not reduced. These limitations limit some of the temperature rise and the thermal-to-electrical performance of the switchgear.
It is therefore desirable to provide a contact finger that reduces contact resistance, increases the temperature rise tolerance of the switchgear, increases the level of dynamic heat, and reduces power loss of the switchgear.
Disclosure of Invention
The object of the present disclosure is to solve at least the drawbacks of the prior art, and to propose a contact finger, in sliding connection with a contact, characterized by comprising a base part, the centre of which comprises an opening for fixing the contact finger; a plurality of said fingers are distributed about said opening and extend from said base, each said finger having at least two sub-fingers, each sub-finger including a contact section in contact engagement with said contact.
According to the scheme, under the condition that the number of the contacts is not increased, the structure can be compatible with the use scene and the matched parts of the contact fingers with eight finger parts in the prior art, the specification and the design of the original switch equipment are not damaged, meanwhile, the number of contact points between the contact fingers and the contacts is doubled, the actual total contact area between the contact fingers and the contacts is greatly increased, the contact resistance is greatly reduced, the thermal field environment of the contacts and the contact fingers is optimized, the current distribution condition of the switch equipment is improved, the tolerance temperature rise and the dynamic heat level of the switch equipment are improved, and the power loss of the switch equipment is reduced. The scheme has simple structure, reliable use and easy manufacture, and is beneficial to reducing the cost.
According to one embodiment of the present disclosure, the number of fingers is eight and evenly distributed around the opening. The pressure load is uniformly distributed after assembly, irreversible deformation of one or more finger parts due to excessive pressure is prevented, the contact fingers are completely disabled, and the actual total contact area between the contact fingers and the contact is increased.
According to one embodiment of the present disclosure, each of the fingers has at least one curved section, wherein the contact section is one of the curved sections.
According to one embodiment of the present disclosure, each of the contact segments has a contact point on the respective finger closest to the central axis of the opening, at which contact point the contact segment is in contact connection with the contact.
According to one embodiment of the present disclosure, the distance between the contact point and the central axis of the opening is smaller than the radius of the circumcircle of the opening.
According to one embodiment of the present disclosure, the distance between the contact point and the central axis of the opening is smaller than the radius of the circumcircle of the cross section of the contact point where the contact head contacts the contact point. According to the scheme, when the contact is inserted into the opening and is in contact with all the finger parts, the contact and the finger parts can form interference fit, so that the finger parts can generate elastic deformation in a direction away from the contact, and therefore positive pressure is generated on the surfaces of the contact and the finger parts, the contact and the finger parts are firmly matched, and in addition, the positive pressure is beneficial to reducing the contact resistance.
According to one embodiment of the present disclosure, the base further comprises a through hole.
According to one embodiment of the present disclosure, the base further comprises a recess.
According to one embodiment of the present disclosure, the through holes and the recesses are alternately arranged between two adjacent ones of the fingers to form a "finger-through hole-finger-recess- …" cyclic sequence.
According to the present disclosure, there is also proposed an electrical switch comprising a contact finger according to any of the preceding claims and a corresponding contact.
According to one embodiment of the present disclosure, the contact and the contact pair are configured such that the contact section is elastically deformed away from the contact. Therefore, the contact surfaces of the contact and the finger generate positive pressure, so that the contact and the finger are firmly matched, and in addition, the positive pressure is beneficial to reducing the contact resistance.
According to one embodiment of the present disclosure, the side of the contact section facing away from the opening is crimped with a ferrule. This further allows the contact and finger to mate securely and further reduces contact resistance. This also helps prevent deformation failure of the fingers such that there is reduced or no pressure between the fingers and the contacts, which in turn results in failure of the mating of the two.
Drawings
FIG. 1 shows a microscopic magnification of the junction of a contact and a finger;
FIG. 2 shows a schematic view of a stylus according to the present disclosure;
fig. 3 shows a schematic view of an assembly of contacts and fingers according to the present disclosure.
Reference numerals
1 contact finger, 11 base, 12 finger, 121 sub-finger, 13 opening, 14 notch, 15 through hole, 16 contact section
2 contact
3-ferrule
4 mounting member
Detailed Description
In order to make the objects, aspects and advantages of the technical solutions of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise indicated, terms used herein have the meaning common in the art. Like reference numerals in the drawings denote like parts.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Although the finger 1 and the tip 2 may be visually or touch smoother, this is not true in this microscopic view. Fig. 1 shows a microscopic enlargement of the contact and finger junction, wherein the junction of the finger 1 and the contact 2 has an interface, the surfaces of the finger 1 and the contact 2 on both sides of the interface are rugged, so that the surfaces of the two are not fully in contact at the interface, wherein part a represents the actual contact portion of the surfaces of the two. When a current flows through the finger 1 and the contact 2, the effective cross-sectional area through which the current flows is reduced, and thus the resistance at the interface is greater.
In order to reduce the contact resistance caused by the situation, the positive pressure at the contact position of the contact finger 1 and the contact 2 can be increased, and as the positive pressure is continuously increased, the surface deformation of the contact finger 1 and the contact 2 at the two sides of the interface at the contact position is increased, so that the number and the area of the actual contact area are also gradually increased (namely, the part A is increased), the effective sectional area of the current flowing through is increased, and the resistance is reduced.
However, as the positive pressure increases to a certain value, the surface deformations of the contact finger 1 and the contact 2 on both sides of the interface at the contact point can no longer be increased substantially, so that the influence on the electrical resistance is no longer significant.
In addition, the total area of the portion a can be increased by directly increasing the number of contact points between the contact finger 1 and the contact 2, for example, increasing the number of contact finger portions of the contact finger 1 to reduce the contact resistance, and the design of the contact finger 1 and the contact 2 is often limited by the space size, and the number of contact finger portions is also limited.
Thus, according to the disclosed embodiments, a stylus with sub-fingers is proposed. Fig. 2 shows a schematic view of a contact finger 1 according to the present disclosure; fig. 3 shows a schematic view of an assembly of contacts and fingers according to the present disclosure. As shown in fig. 2, the contact finger comprises a base 11 and a finger portion 12 extending from the base, wherein the center of the base comprises a large opening 13 for securing the contact finger 1, which opening 13 may be circular.
The base may also be provided with a recess 14 and a through hole 15, wherein the through hole 14 is for a screw to pass through for fixing to the mount 4, as shown in fig. 3. The recess 14 then allows for the purpose of preventing interference of the contact fingers with other structures on the mounting member 4 and/or for providing access to the structures on the mounting member 4 (as shown in fig. 3).
The base may have a plurality of fingers arranged thereon, for example, 8 fingers as shown in fig. 2, and the number of fingers may be 10, 12, etc. depending on the space left for the contact finger 1, the structure of other components to be engaged with the contact finger 1, or the actual application scenario. The 8 fingers can be arranged around the opening 13 completely uniformly and at equal intervals, which is beneficial to uniformly distributing the pressure load after assembly, preventing one or more fingers from irreversibly deforming due to excessive pressure, completely failing the contact finger 1, and increasing the actual total contact area between the contact finger 1 and the contact 2.
As shown in fig. 2, the through holes 15 and the recesses 14 are alternately arranged between two adjacent fingers 12 to form a cyclic sequence of "finger-through holes-finger-recesses- …", so that the structure is compact, which is advantageous for saving space and mounting of the contact finger 1.
Each finger 12 may include a plurality of sub-fingers 121, such as two sub-fingers 121 as shown in fig. 2. The fingers 12 can each be divided by a slot in the middle into two identical sub-fingers, each sub-finger 121 being in contact with the contact 2. Under the condition that the number of the contacts is not increased, the structure can be compatible with the use scene and the matched parts of the contact finger with eight finger parts in the prior art, the specification and the design of the original switch equipment are not damaged, meanwhile, the number of contact points between the contact finger 1 and the contact 2 is doubled, the actual total contact area between the contact finger 1 and the contact 2 is greatly increased, the contact resistance is greatly reduced, the thermal field environment of the contact 2 and the contact finger 1 is optimized, the current distribution condition of the switch equipment is improved, the temperature rise resistance and the heat movement resistance level of the switch equipment are improved, and the power loss of the switch equipment is reduced.
Each finger 12 may also comprise two curved sections, as shown in fig. 2, wherein the first curved section is adjacent to the base 11 to change the orientation of extension of the finger 12, i.e. the direction extending from the rim of the base 11 is turned to an extension substantially perpendicular to the direction of extension of the rim. The second curved section may be a contact section 16, which contact section 16 is intended to be in contact connection with the contact 2 for the passage of an electrical current between the contact finger 1 and the contact 2. The contact section 16 may be bent towards the opening 13 such that the contact section 16 has a contact point on the corresponding finger 12 closest to the centre axis of the opening 13, at which contact point the contact section 16 is in contact connection with the contact.
The distance between the contact point and the central axis of the opening 13 is smaller than the radius of the circumscribing circle of the opening 13, and when the opening 13 is a standard circular opening, as shown in fig. 2, is smaller than the radius of the opening 13. The distance between the contact point and the central axis of the opening 13 is smaller than the radius of the circumscribing circle of the cross section of the contact point 2 where the contact point contacts, when the contact 2 is of cylindrical structure, than the radius of the circular cross section of the contact 2. According to this structure, when the contact 2 is inserted into the opening 13 and brought into contact with all the fingers 12, the contact 2 and the contact finger 1 can form an interference fit, so that the fingers 12 are elastically deformed in a direction away from the contact, and thus positive pressure is generated on the surfaces of the two, so that the contact 2 and the contact finger 1 are firmly engaged, and furthermore, the positive pressure is advantageous in reducing contact resistance.
In order to further secure the contact 2 and the contact finger 1 and to further reduce the contact resistance, a ferrule may also be used to tighten the contact section 16 on the side facing away from the opening 13 when the contact 2 and the contact finger 1 are mated to increase the positive pressure between the contact finger 1 and the contact 2. This advantageously prevents deformation failure of the finger 12 such that there is reduced or no pressure between the contact finger 1 and the contact 2, which in turn results in failure of the mating of the two.
The present disclosure also proposes an electrical switch comprising any of the contact fingers 1 and contacts 2 described above, and may comprise the ferrule 3 described above.
It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and/or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. The functions or capabilities of the various elements or modules described herein are for illustration only and are in no way limiting, but are merely exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will become apparent to those of skill in the art upon reading the foregoing description. The scope of the disclosure should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
In the appended claims, the terms "including" and "in which" are used as the plain-english equivalents of the respective terms "comprising" and "wherein. Furthermore, in the following claims, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.
Claims (12)
1. A contact finger slidably connected to a contact, comprising
A base portion having an opening in a center thereof for securing the contact finger;
a plurality of said fingers are distributed about said opening and extend from said base, each said finger having at least two sub-fingers, each sub-finger including a contact section in contact engagement with said contact.
2. The finger according to claim 1, wherein,
the number of fingers is eight and evenly distributed around the opening.
3. The finger according to claim 1, wherein,
each finger has at least one curved section, wherein the contact section is one of the curved sections.
4. The finger according to claim 1, wherein,
each of the contact segments has a contact point on the respective finger closest to the central axis of the opening at which the contact segment is in contact connection with the contact.
5. The finger according to claim 4, wherein,
the distance between the contact point and the central axis of the opening is smaller than the radius of the circumcircle of the opening.
6. The finger according to claim 5, wherein,
the distance between the contact point and the central axis of the opening is smaller than the radius of the circumcircle of the cross section of the contact point of the contact head.
7. The finger according to claim 2, wherein,
the base also includes a through hole.
8. The finger according to claim 7, wherein,
the base also includes a recess.
9. The finger according to claim 8, wherein,
the through holes and the recesses are alternately arranged between two adjacent fingers to form a "finger-through hole-finger-recess- …" cyclic sequence.
10. An electrical switch, characterized in that,
a contact finger comprising any one of the preceding claims and a corresponding contact.
11. An electrical switch as claimed in claim 10, wherein,
the contact and the contact pair are combined so that the contact section is elastically deformed away from the contact.
12. An electrical switch as claimed in claim 10, wherein,
the side of the contact section facing away from the opening is crimped with a ferrule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321168891.2U CN219759392U (en) | 2023-05-15 | 2023-05-15 | Contact finger and corresponding electrical switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321168891.2U CN219759392U (en) | 2023-05-15 | 2023-05-15 | Contact finger and corresponding electrical switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219759392U true CN219759392U (en) | 2023-09-26 |
Family
ID=88089898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321168891.2U Active CN219759392U (en) | 2023-05-15 | 2023-05-15 | Contact finger and corresponding electrical switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219759392U (en) |
-
2023
- 2023-05-15 CN CN202321168891.2U patent/CN219759392U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |