EP3675291B1 - Système de piste d'électrification basse tension - Google Patents

Système de piste d'électrification basse tension Download PDF

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Publication number
EP3675291B1
EP3675291B1 EP19217522.2A EP19217522A EP3675291B1 EP 3675291 B1 EP3675291 B1 EP 3675291B1 EP 19217522 A EP19217522 A EP 19217522A EP 3675291 B1 EP3675291 B1 EP 3675291B1
Authority
EP
European Patent Office
Prior art keywords
conductive bar
conductive
electrical plug
power transmission
low voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19217522.2A
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German (de)
English (en)
Other versions
EP3675291A1 (fr
Inventor
Kai Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Self Electronics Co Ltd
Self Electronics Germany GmbH
Original Assignee
Ningbo Self Electronics Co Ltd
Self Electronics Germany GmbH
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Publication date
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Publication of EP3675291A1 publication Critical patent/EP3675291A1/fr
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Publication of EP3675291B1 publication Critical patent/EP3675291B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R25/00—Coupling parts adapted for simultaneous co-operation with two or more identical counterparts, e.g. for distributing energy to two or more circuits
    • H01R25/14—Rails or bus-bars constructed so that the counterparts can be connected thereto at any point along their length
    • H01R25/147—Low voltage devices, i.e. safe to touch live conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/22—Contacts for co-operating by abutting
    • H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2414—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means conductive elastomers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R25/00—Coupling parts adapted for simultaneous co-operation with two or more identical counterparts, e.g. for distributing energy to two or more circuits
    • H01R25/14—Rails or bus-bars constructed so that the counterparts can be connected thereto at any point along their length
    • H01R25/142—Their counterparts

Definitions

  • the present invention relates to the field of lighting, with particular emphasis on a track system for low voltage power supply, particularly for providing a low power supply voltage for lighting of shelves for product display purposes.
  • Track system for low voltage power supply is widely used in commercial lighting fields such as supermarket shelves and freezer floors and for other commercial lighting purposes.
  • a conventional track system for low voltage power supply uses bare copper bars as positive and negative electrodes, and in order to improve the effective utilization of electricity, often uses pure copper.
  • patina e.g. copper green
  • the surface of the copper bar is often plated, but this still cannot solve the problem that a wet environment or an environment with high humidity will cause the formation of liquid or moisture on the surface of the track and in the contact areas used for electric power supply.
  • the positive and negative poles of the exposed copper bar are prone to be short-circuited by the liquid or moisture, causing frequent failure of such track systems for low voltage power supply, which makes such track systems suitable for low voltage power supply only for the dry environments.
  • a conductive elastomer is a form of elastomer, often natural rubber or other rubber substitute, that is manufactured to conduct electricity. This is commonly accomplished by distributing carbon or other conductive particles, particularly conductive metal particles, throughout the raw material prior to setting it. Conductive elastomers are often uniformly doped with metal conductive particles in the rubber.
  • Conductive elastomers are mainly used in the industry for shielding, anti-interference, contact buttons, signal conduction and other small current applications.
  • conductive elastomers are not used in power devices for power transmission. The main reason is that a simple conductive elastomer, particularly a simple conductive rubber, has a relatively high impedance.
  • Conductive elastomers are often pressure-sensitive, with their conductivity varying with the amount of pressure put on it. Although the impedance is relatively small after being squeezed, when a conductive elastomer is directly used as a conductive member for long distance power transmission, its impedance will increase with the increase of the distance, resulting in very high Ohmic transmission losses, and the so-called long distance here is equivalent to a very close distance in the traditional sense by contrast, such as 10 cm.
  • US 5 664 953 A discloses a track system for connecting telephones. Electrical connection is established by coupling a rigid electrically conductive member with a flexible member. More specifically, the electrical connection is established by means of tapered channels of corresponding shape formed in both members. Flexible conductive portions on the flexible member are squeezed when both members are pushed against each other. The rigid electrically conductive member is not wrapped by a conductive elastomer.
  • a track system for low voltage power supply according to the invention enables a wide application range, high power transmission efficiency and good safety performance, even in humid environments.
  • a track system for low voltage power supply comprising a power transmission track and an electrical plug that is configured to be detachably connected to the power transmission track.
  • a surface of the power transmission track is provided with a first conductive bar
  • the electrical plug is provided with a second conductive bar, wherein the electrical plug is configured such that the second conductive is contacted with the first conductive bar for low voltage power supply.
  • surfaces of the first conductive bar and of the second conductive bar are wrapped or coated with a conductive elastomer, wherein the conductive elastomer on the second conductive bar squeezes to contact with the conductive elastomer on the first conductive bar when the electrical plug is connected to the power transmission track, and wherein the portions of the conductive elastomer that are squeezed due to their mutual contact when the electrical plug is connected to the power transmission track take a reduced electric resistance value to form a conductive contact portion for low voltage power supply.
  • the second conductive bar is bent towards the first conductive bar to form a bending portion extending in parallel with the first conductive bar, and the bending portion squeezes and contacts with the first conductive bar when the electrical plug is assembled with and connected to the power transmission track; and wherein the shape of the conductive elastomer on the surface of the second conductive bar is matched to the deformation of the second conductive bar.
  • the second conductive bar extends out of the electrical plug, and the protruding portion of the second conductive bar is surrounded by a common rubber layer.
  • the second conductive bar extends out of the electrical plug, and the electrical plug is provided with a limiting portion extending in the direction of the second conductive bar, and the lower end of the limiting portion contacts the second conductive bar and applies a pressure thereto in the direction of the power transmission track when the electrical plug is connected to the power transmission track.
  • the electrical plug comprises an upper end cover and a lower end cover fixedly assembled with the upper end cover; wherein the lower end cover is provided with an opening, and the bending portion is exposed from the opening to the outside of the electrical plug.
  • the electrical plug is assembled with and connected to the power transmission track by a clamp fixedly mounted thereto; and the power transmission track is provided with a clamping portion having two clamping plates, and the lower ends of the two clamping plates of the clamp pass through the electrical plug from top to bottom and are clamped on both sides of the clamping portion when the electrical plug is connected to the power transmission track.
  • the invention has the advantages that the copper bar is coated with the conductive elastomer, which can not only make the conductive elastomer play the role of protection and isolation, avoid the copper bar direct contact with the air to generate copper rust, thereby preventing the copper bar from short circuit caused by condensation of the liquid on the track in the humid environment, and at the same time can fully utilize the characteristics that the conductive elastomer has good electrical conductivity when subjected to pressure, when the electrical plug is in contact with the track, it acts as a conductive medium to assist the copper bar to transmit power, which makes the track system for low voltage power supply can be safely used in humid environments, expands the scope of application, and effectively ensures power transmission efficiency.
  • FIGS.1-4 illustrate an embodiment of a track system for low voltage power supply according to the present application.
  • the track system for low voltage power supply includes a power transmission track 1 and an electrical plug 2 (electrical connector) that is configured to be detachably connected to the power transmission track 1.
  • the surface of the power transmission track 1 is provided with at least one first conductive bar 11, and particularly may be provided with two first conductive bars 11 extending in parallel with each other and spaced apart from each other, as shown in Fig. 4 .
  • the electrical plug 2 is provided with at least one second conductive bar 21 which can be contacted with the first conductive bar 11 to get electricity.
  • the electrical plug 2 may be provided with two second conductive bars 21 extending in parallel with each other and spaced apart from each other, as shown in Fig. 2 .
  • the track system for low voltage power supply further includes a connection portion 3 for connecting to an external low voltage power supply, as shown in FIG.1 .
  • the track system for low voltage power supply further includes other components, such as a corner adapting piece between the power transmission track and the power transmission track, etc., however, as these are not the focus of this present application, they are not elaborated here, and the connection portion 3 will be briefly explained below.
  • connection portion 3 is preferably located at one end of the power transmission track 1, and the connection portion 3 is connected to the low voltage power supply via a copper bar 5.
  • the low voltage power supply generally takes a value of 24V or 48V.
  • the copper bar 5 may be electrically connected to the power transmission track 1 by welding, and the copper bar 5 transmits the power of the power supply end to the power transmission track 1, and the electrical plug 2 takes power from the power transmission track 1 to supply power to a lighting end.
  • the copper bar 5 may also be electrically connected to the power transmission track 3 in other ways. This technology is well known to those skilled in the art and therefore will not be described in detail herein.
  • the surfaces of the first conductive bar 11 and of the second conductive bar 21 are wrapped with a conductive elastomer 4, particularly with a conductive rubber.
  • the conductive elastomer 4 on the second conductive bar 21 squeezes to contact with the conductive elastomer 4 on the first conductive bar 11, and due to this squeezing the resistance value of those portions of the conductive elastomer 4 that are pressed against each other when the electrical plug 2 is connected to the power transmission track 1 and that are contacted is reduced to thereby form a conductive contact portion of a proper resistance value suitable for low voltage power supply.
  • FIGs.3-4 please refer to FIGs.3-4 .
  • the conductive elastomer When the conductive elastomer is not under pressure, it has a larger resistance value. Because the conductive elastomer is wrapped on the surface of the conductive bars, the conductive elastomer can exert an elastomeric (rubber) insulation function and enable a good sealing performance to isolate the conductive bar from ambient air and humidity or moisture. Even if the track system for low voltage power supply is used in a humid environment, due to the isolation and insulation by the conductive elastomer, it can also effectively prevent the conductive bar from coming into contact with any liquid or moisture condensed on the track to thereby effectively prevent a short circuit.
  • elastomeric (rubber) insulation function Even if the track system for low voltage power supply is used in a humid environment, due to the isolation and insulation by the conductive elastomer, it can also effectively prevent the conductive bar from coming into contact with any liquid or moisture condensed on the track to thereby effectively prevent a short circuit.
  • the conductive elastomer is subjected to a certain pressure when the electrical plug is connected to the power transmission track.
  • the electric resistance of the squeezed portions of the conductive elastomers will decrease, offering a good conductivity for low voltage power supply.
  • the resistance value of the squeezed contact portions of the conductive elastomer is reduced to form a conductive contact portion for low voltage power supply, thus acting as a conductive power transmission bridge between the first conductive bar and the second conductive bar, while other portions not directly contacted and pressed are substantially unchanged in resistance.
  • the non-squeezed portions of the conductive elastomer continue to exert an excellent insulating isolation function.
  • the conductive bars can complement the conductive elastomer and have good power transmission performance while being applicable to a humid environment.
  • the second conductive bar 21 is resiliently biased against the first conductive bar 11 toward a position, in which both conductive elastomers are sufficiently pressed against each other to enable the low voltage power supply. More specifically, as shown in Fig. 2 the second conductive bar 21 is bent toward the first conductive bar 11 to form a U-shaped bending portion 211 having a bar that extends in parallel with the first conductive bar 11, wherein the bending portion 211 squeezes and is in contact with the first conductive bar 11 when the electrical plug 2 is connected to the power transmission track 1.
  • the shape of the conductive elastomer 4 on the surface of the second conductive bar 21 is adapted to the deformation of the second conductive bar 21, that is, the conductive elastomer 4 on the second conductive bar 21 is bent due to the deformation of the second conductive bar 21, and the formed bending portion 211 squeezes and contacts with the conductive elastomer 4 on the first conductive bar 11 to form a conductive contact portion for low voltage power supply.
  • the second conductive bar 21 extends out of the electrical plug 2, as shown in FIG.1 .
  • the protruding portion of the second conductive bar 2 extending out of the electrical plug 2 is surrounded by a common rubber layer.
  • the electrical plug 2 comprises an upper end cover 22 and a lower end cover 23 fixedly assembled with the upper end cover 22.
  • the electrical plug 2 is provided with a limiting portion 24 extending in the direction of the second conductive bar 21. The lower end of the limiting portion 24 contacts the second conductive bar 21 and applies a pressure to the second conductive bar 21 toward the direction of the power transmission track 1.
  • the limiting portion 24 can apply a force to the second conductive bar 21 in the direction of the track 1, the second conductive bar 21 can be prevented from being pulled out of the power transmission track 1 due to excessive forces. And the pull-off preventing effect provided by the limiting portion 24 is good.
  • the limiting portion 24 may be disposed perpendicular to the second conductive bar 21, that is, the limiting portion 24 may be perpendicular to the inner wall of the upper end cover 22.
  • the limiting portion 24 may be shaped as a limiting bar, as shown in FIG. 3 , but it can also be another structure that can achieve the anti-pull-off effect.
  • FIG. 3 is a schematic view showing the structure between the lower end cover 23 and the opening 231.
  • the electrical plug 2 is detachably connected to the power transmission track 1, so that only the faulty parts need to be removed without the necessity of repairing the entire system, which saves cost.
  • the electrical plug 2 is assembled and connected with the power transmission track 1 by means of a clamp 6 fixedly mounted on the electrical plug 2 that has at least one clamping plate 61, and the power transmission track 1 is provided with a clamping portion 12, having a rectangular profile in this example.
  • the front end of the clamping plate 61 positively grips behind the rear side of the clamping portion 12 of rectangular profile to thereby fix the position of the electrical plug 2 relative to the power transmission track 1.
  • the clamping plate 61 resiliently biases the electric plug 2 against the power transmission track 1, so that the associated bending portion 211 of the electric plug 2 is resiliently pressed against a slanted surface of the first conductive bar 11 facing away from the clamping portion 12.
  • the electrical plug 2 may comprise two clamping plates 61 resiliently biased against each other like the two legs of a clothespin so that the two clamping plates 61 may clamp the opposite front and rear side of the clamping portion 12 of rectangular profile to thereby fix the position of the electrical plug 2 relative to the power transmission track 1.
  • the lower ends of the two clamping plates 61 of the clamp 6 can extend through the opening 231 to the outside of the electrical plug 2 from top to bottom.
  • the associated bending portion 211 of the electric plug 2 is resiliently pressed against a slanted surface of the first conductive bar 11 facing away from the clamping portion 12.
  • connection methods can be used to detachably connect the electrical plug to the power transmission track.
  • connection methods can be designed according to actual situations, and this is not the protection focus of the present application, and therefore is not enumerated here.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)

Claims (7)

  1. Un système de rails pour l'alimentation électrique à basse tension, comprenant un rail de transmission de puissance (1), et
    une fiche électrique (2) configurée pour être connectée de manière détachable avec le rail de transmission de puissance (1), dans laquelle
    une surface du rail de transmission de puissance (1) est pourvue d'une première barre conductrice (11),
    la fiche électrique (2) est pourvue d'une deuxième barre conductrice (21), et
    la deuxième barre conductrice (21) est en contact avec la première barre conductrice (11) lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1) pour une alimentation en puissance basse tension, dans lequel
    les surfaces de la première barre conductrice (11) et de la deuxième barre conductrice (21) sont enveloppées d'un élastomère conducteur (4),
    l'élastomère conducteur (4) sur la deuxième barre conductrice (21) s'écrase pour entrer en contact avec l'élastomère conducteur (4) sur la première barre conductrice (11) lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1), et
    les parties de l'élastomère conducteur (4) qui sont écrasées en raison de leur contact mutuel lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1) prennent une valeur de résistance électrique réduite pour former une partie de contact conductrice pour une alimentation électrique à basse tension, dans lequel
    la deuxième barre conductrice (21) est pliée vers la première barre conductrice (11) pour former une partie de pliage (211) s'étendant parallèlement à la première barre conductrice (11), dans laquelle
    la partie de pliage (211) s'écrase et entre en contact avec la première barre conductrice (11) lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1) et
    la forme de l'élastomère conducteur (4) sur la surface de la deuxième barre conductrice (21) est adaptée à une déformation de la deuxième barre conductrice (21).
  2. Le système de rails pour l'alimentation électrique à basse tension selon la revendication 1, dans lequel la deuxième barre conductrice (21) s'étend hors de la fiche électrique (2), et la partie en saillie de la deuxième barre conductrice (2) est entourée d'une couche de caoutchouc commune.
  3. Le système de rails pour l'alimentation électrique à basse tension selon la revendication 1 ou 2, dans lequel la deuxième barre conductrice (21) s'étend hors de la fiche électrique (2), et la fiche électrique (2) est munie d'une partie de limitation (24) s'étendant dans la direction de la deuxième barre conductrice (21), et une extrémité inférieure de la partie de limitation (24) est en contact avec la deuxième barre conductrice (21) et applique une pression sur celle-ci dans la direction du rail de transmission de puissance (1) lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1).
  4. Le système de rails pour l'alimentation électrique à basse tension selon l'une quelconque des revendications précédentes, dans lequel la seconde barre conductrice (21) est sollicitée élastiquement contre la première barre conductrice (11) vers une position dans laquelle les deux élastomères conducteurs (4) sont suffisamment pressés l'un contre l'autre pour permettre l'alimentation électrique basse tension.
  5. Le système de rails pour l'alimentation électrique à basse tension selon l'une quelconque des revendications précédentes, dans lequel la fiche électrique (2) comprend un couvercle d'extrémité supérieur (22) et un couvercle d'extrémité inférieur (23) assemblé de manière fixe avec le couvercle d'extrémité supérieur (22) ; le couvercle d'extrémité inférieur (23) est pourvu d'une ouverture (231) ; et la partie de flexion (211) est exposée depuis l'ouverture (231) vers un extérieur de la fiche électrique (2).
  6. Le système de rails pour l'alimentation électrique à basse tension selon l'une quelconque des revendications précédentes, dans lequel la fiche électrique (2) est reliée au rail de transmission de puissance (1) par une pince (6) montée de manière fixe sur celle-ci ; et le rail de transmission de puissance (1) est pourvue d'une partie de serrage (12) ayant deux plaques de serrage (61), et les extrémités inférieures des deux plaques de serrage (61) de la pince (6) passent à travers la fiche électrique (2) de haut en bas et sont serrées des deux côtés de la partie de serrage (12) lorsque la fiche électrique (2) est connectée avec le rail de transmission de puissance (1).
  7. Utilisation d'un système de rails selon l'une quelconque des revendications précédentes pour l'alimentation en basse tension d'étagères utilisées pour la présentation de produits.
EP19217522.2A 2018-12-27 2019-12-18 Système de piste d'électrification basse tension Active EP3675291B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811618665.3A CN109921245A (zh) 2018-12-27 2018-12-27 一种低压取电轨道系统

Publications (2)

Publication Number Publication Date
EP3675291A1 EP3675291A1 (fr) 2020-07-01
EP3675291B1 true EP3675291B1 (fr) 2022-06-08

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EP (1) EP3675291B1 (fr)
CN (1) CN109921245A (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10503615A (ja) * 1994-07-25 1998-03-31 ミネソタ・マイニング・アンド・マニュファクチュアリング・カンパニー 任意の位置に配置可能な相互噛合部を備えた弾性固着テーパー接続器
EP3855577A1 (fr) * 2013-06-24 2021-07-28 RTC Industries, Inc. Alimentation électrique avec des connexions mécaniques

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Publication number Publication date
CN109921245A (zh) 2019-06-21
EP3675291A1 (fr) 2020-07-01

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