CN108475861A - The capsule of electrical connection for high-tension cable - Google Patents

Abstract

The invention relates to an enclosure (10) for the electrical connection of at least two high voltage cables (C1, C2, C3) each comprising at least two insulated conducting wires ( F1+, F1‑, F2+, F2‑, F3+, F3‑), the free end of each conductor is provided with a terminal for electrical connection through an eyelet (B1+, B1‑, B2+, B2‑, B3+, B3‑), The enclosure comprises an electrically insulating support plate (18) supporting parallel screws (V+, V‑) made of electrically conductive material, each of these parallel screws being equipped with axial tightening means (E+, E‑) , characterized in that the enclosure comprises a single first screw (V+) for electrical connection of all these conductive wires (F1+, F2+, F3+) with a given first phase, and a single first screw (V+) for a given second phase A single second screw (V-) for the electrical connection of all these conductive wires (F1-, F2-, F3-).

Description

Enclosures for electrical connection of high voltage cables

technical field

The invention relates to an enclosure for the electrical connection of a plurality of high-voltage cables in the engine compartment of a motor vehicle. It will be recalled that in the technical fields involved, mainly the motor vehicle field, the high voltage range varies from 60 volts to 600 volts.

In particular, the invention relates to an enclosure for the connection of various components belonging to, for example, cooling circuits (such as compressors and boilers), and a power electronics block (PEB), which ensures that the power electronics And in particular ensure the inverter function for driving the machine and for converting the DC power supply from one voltage level to another.

Background technique

Different designs of enclosures for the electrical connection of at least two high-voltage cables each comprising at least two insulated conducting wires of different electrical phases, the free ends of each conductor being provided with an eyelet electrical connection terminal lug , the enclosure comprising an electrically insulating support plate supporting parallel screws made of electrically conductive material, each of which is equipped with axial clamping means.

According to these designs, for example for the electrical connection of three cables each comprising two electrical conductors, a support plate made of insulating material supports six screw rods, each provided with a pinch for axially clamping an eyelet terminal lug. A nut, ie each free end of the electrical conductor is secured and individually electrically linked to the associated screw.

In order to link together these three conductors of the same electrical phase, the enclosure includes means for electrically connecting the three associated screws, such as copper strips (also called "bus bars") of sufficient cross-section. ”) and each comprising a hole through which a screw rod passes, the eyelet of the electrical connection terminal lug is clamped into electrical contact with the conductive strip(s) by means of a nut.

This design is complex, involves a large number of parts to be assembled and is also very cumbersome due to the need to arrange the busbars in a way that also avoids short circuits and arcing phenomena between different phases.

More bulky if it is desired to group all the "outlets" of the cables from the enclosure together into the same area and/or the same face of the enclosure for ease of arrangement in the nacelle.

Contents of the invention

To this end, the invention proposes an enclosure of the aforementioned type, characterized in that it comprises: a single first screw for the electrical connection of all the conductive wires with the same first phase, and with A single second screw for electrical connection of all conductive wires with the same second phase.

According to other features of the invention:

- each screw extends axially through the support plate and each of the two sections of the screw is equipped with axial clamping means;

- the enclosure comprises a wall orthogonal to the support plate, the wall comprising cable entry apertures;

- said walls are arranged at one end of the support plate and the screws are arranged near the other end of the support plate;

- the enclosure comprises means for fixing the cables to the support plate;

- said fixing means are produced in conductive material and are electrically linked to the outside of the enclosure to allow the enclosure to be grounded;

- the axial clamping means is a nut;

- the screw belongs to the screw;

- the axial clamping means is the head of the screw;

- The orthogonal walls and the support plate are made in one piece by molding in plastic material.

Description of drawings

Other features and advantages of the present invention will become apparent upon reading the following detailed description, for which understanding reference is made to the accompanying drawings, in which:

- Figure 1 is a perspective view of an exemplary embodiment of a connection enclosure according to the invention;

- Figure 2 is a view from below of the enclosure of Figure 1 without showing the high voltage cables;

- Figure 3 is a front perspective view of the capsule of Figure 1 without its cap;

- Figure 4 is a rear perspective view of the capsule of Figure 3;

- Figure 5 is a sectional view of the enclosure of Figures 3 and 4 through a transverse vertical plane.

Detailed ways

In the following description and claims, the expression will be used in a non-limiting manner with reference to the dihedron (L, T, V) represented in the drawings and with reference to the definitions given in the description and without reference to the gravitational force of the Earth Orientations such as "axial", "landscape" and "vertical".

In the following description, the same reference numerals designate the same or parts with similar functions.

The figures show an electrical connection enclosure 10 consisting essentially of a body 12 and a cap or cover 14 .

The enclosure 10 here allows the simultaneous electrical connection of three high voltage cables Ci ( C1 , C2 and C3 ).

Each cable Ci here comprises two electrical conductors of different phases Fi+ and Fi−.

Thus, the first cable C1 comprises two conductors F1+ and F1-, while the second cable C2 comprises two conductors F2+ and F2-, and the third cable C3 comprises two conductors F3+ and F3-.

Each cable Ci is here of similar design and comprises an outer sheath Gi in which the two electrical conductors Fi+ and Fi- are housed.

Each conductor Fi+ and Fi- is electrically insulated from the associated other electrical conductor Fi-, Fi+, and at its free end arranged inside the enclosure 10 each comprises a connection terminal, which here is electrically connected in the form of an eyelet respectively The form of terminal lug Bi+, Bi-.

Each terminal lug Bi+ is electrically linked to the conductive core of the associated electrical conductor Fi+, while each terminal lug Bi- is electrically linked to the conductive core of the associated electrical conductor Fi−.

The main body 14 is a molded part made of electrically insulating plastic material and basically comprises a vertical support plate 18 , and a horizontal bottom wall 20 .

The support plate 18 includes a vertical and longitudinally oriented front face 22 and a parallel and opposite rear face 24 .

The support plate 18 is in generally rectangular form delimited by a horizontal top edge 28 and by two opposing vertical edges 30 and 32 .

The bottom wall 20 is delimited by a horizontal top surface 34 and by parallel and opposite bottom surfaces 36 constituting a support and fixing surface for the electrical connection enclosure 10 .

For this fixation, for example to a body element of a motor vehicle, the bottom wall 20 comprises two opposing longitudinal lugs 38 .

The support plate 18 is laterally offset rearwardly with respect to the central vertical plane of the bottom wall 20 .

The bottom wall comprises three vertical through-holes Ti, each of these through-holes is dimensioned to allow the introduction of the associated cable Ci.

At the level where the support plate 18 joins the top face 34 of the bottom wall 20 , it comprises a front bottom piece 40 in the form of an excess, and a rear bottom piece 42 in the form of an excess.

The front block 40 includes a semi-cylindrical concave recess L1 capable of receiving a facing portion of the cable C1, and a semi-cylindrical concave recess L2 capable of receiving a facing portion of the cable C2. The two recesses L1 and L2 are longitudinally and laterally offset relative to each other.

The rear block 42 includes a semi-cylindrical concave recess L3 capable of receiving the facing portion of the cable C3. The recess L3 is longitudinally centered.

As can be seen by way of example of FIG. 3 , a plate 44 may be provided for immobilizing and fixing the cables C1 and C2 by means of screws 46 to avoid any damaging pulling of the connection terminal lugs Bi+ and Bi−. A similar arrangement (not shown) can be provided on the rear block 42 . The stop plate 44 may be electrically conductive and ensures the grounding, or earthing, function of the enclosure via a metal tongue 50 which passes through a slot 52 in the bottom wall 20 .

According to the teaching of the present invention, the support plate 18 supports a single conductive screw V+ for the electrical connection of all conductors Fi+.

According to the teaching of the present invention, the support plate 18 supports a single conductive screw V- for the electrical connection of all conductors Fi-.

The two screws V+ and V− are positioned in the vicinity of the top edge 28 of the support plate 18 .

The two screws V+ and V- are longitudinally offset relative to each other. Screw V+ is substantially aligned with hole T1 and screw is substantially aligned with hole T2.

Each screw V+ extends transversely through the support plate 18 and thus it comprises opposite threaded front and rear sections, each of which can pass through a corresponding and associated conductor Fi+ and Fi - Eyelets for connecting terminal lugs Bi+ and Bi-.

To ensure reliable electrical contact and fixation, each screw segment receives an axial clamping nut E+, E-.

According to the compact and low-volume design shown in the figures, the two cables C1 and C2 are arranged in front of the front side 22, with their terminal lugs B1+ and B2+ fixed to the screw V+ and their terminal lug B1 - and B2- are fixed to the screw V-.

A third cable C3 is arranged in front of the rear face 24 with its terminal lug B3+ fixed to the screw V+ and its terminal lug B3- fixed to the screw V−.

All connections of the three cables C1 , C2 and C3 are thus ensured by means of only two screw rods and here only four clamping nuts.

Still with two screws V+ and V- and four clamping nuts, by making very slight modifications to the block 12 (not shown), but within the same volume, it is possible here to easily attach two of the four cables One strip is attached to the front side 22 and two strips are attached to the back side 24 .

These screws may each be associated with a pair of nuts as indicated, or each belong to a screw which is then associated with a single clamping nut.

Each screw can be screwed into a hole in the support plate 18 or fixed to the support plate in insert form by overmolding.

Claims (10)

1. capsule (10) of the one kind for the electrical connection of at least two high-tension cables (C1, C2, C3), these high-tension cables respectively wrap Include at least two insulated conductive wires (F1+, F1-, F2+, F2-, F3+, F3-) of different electric phases (+, -), the freedom of each electric conductor End is equipped with eyelet electric connection terminal lug plate (B1+, B1-, B2+, B2-, B3+, B3-), which includes bearing by eyelet conduction The electrical isolation support plate (18) of parallel screw made of material (V+, V-), each parallel screw in these parallel screws Equipped with axial grip device (E+, E-),

It is characterized in that, the capsule includes all these conductor wires (F1+, F2+, F3+) for the first phase having the same Electrical connection single first screw rod (V+), and for the second phase having the same all these conductor wires (F1-, F2-, F3- single second screw rod (V-) of electrical connection).

2. capsule as described in claim 1, which is characterized in that each screw rod (V+, V-) extends axially through the support plate (18), and it is, each section in two sections of screw rod (V+, V-) is equipped with axial grip device (E+, E-).

3. capsule as described in claim 1, which is characterized in that the capsule includes the wall (20) orthogonal with support plate (18), The wall includes cable leadthrough aperture mouth (C1, C2, C3).

4. capsule as claimed in claim 3, which is characterized in that the wall (20) is arranged at the end of the support plate (18) Place, and be, these screw rods (V+, V-) are arranged near another end of the support plate (18).

5. capsule according to any one of the preceding claims, which is characterized in that the capsule includes for consolidating these cables Surely the device (44) in the support plate (18) is arrived.

6. capsule as claimed in claim 5, which is characterized in that the immobilising device (44) with conductive material produce and it is electric Gas links to the outside of the capsule (10), to allow the capsule to be grounded.

7. capsule according to any one of the preceding claims, which is characterized in that the described axial grip device is nut (E +, E-).

8. capsule according to any one of the preceding claims_,It is characterized in that, the screw rod (V+V-) belongs to screw.

9. capsule as described in preceding claims, which is characterized in that the axial grip device is the head of the screw.

10. capsule as claimed in claim 3, which is characterized in that by being moulded with plastic material, the orthogonal wall (20) with should Support plate (18) is made into single piece.