CN218300374U - Locking and sealing structure of electrical junction box - Google Patents

Abstract

The utility model relates to an electrical seal field, concretely relates to electrical junction box locking seal structure, including the electrical junction box body, electrical junction box side sets up locking glan head, sets up sealed rubber ring in the locking glan head, and the electrical junction box passes through locking glan head and connects high-pressure pencil, and sealed rubber ring cladding high-pressure pencil periphery sets up the gum cover between sealed rubber ring and the high-pressure pencil periphery for locking glan head appears ageing or diminishing shrink not hard up from the sealed rubber ring in area, or the pencil receives to bend when too big, and the gum cover still cooperates sealed rubber ring to rise tightly, provides protection safety guarantee for above-mentioned operating mode, increases the barrier propterty of high-pressure pencil spare part. The fault rate of the insulation problem of the high-voltage system of the new energy vehicle is indirectly reduced.

Description

Locking and sealing structure of electrical junction box

Technical Field

The utility model relates to an electrical seal field, concretely relates to electrical junction box locking seal structure.

Background

For the new energy automobile industry developing at a high speed, the problem of the sealing performance of the whole orange high-voltage wire harness outer sheath layer in the locking of the gland head is solved, and some factors influence safety when the automobile stands in a special working condition. However, in the pure electric vehicle high-voltage topological system, the process level of locking of the high-voltage locking flange head or the connection of the locking flange head at the electric junction box and the high-voltage wire harness outer sheath layer is related to the whole vehicle protection safety.

Particularly, when a transition connection process of a high-voltage wire harness and a high-voltage locking glan head of a new-energy pure electric vehicle is subjected to a special application scene working condition, moisture and water immersion always form a relatively troublesome protection problem in the industry, according to the requirements of fire prevention and water prevention sealing in new-energy vehicle industry standards GB4208 and GB2408, the transition waterproof rubber ring inside the locking glan head is especially tested to have the performance that the transition waterproof rubber ring penetrates through, locks, adheres and is compressed on an outer sheath layer of the high-voltage wire harness, the IP protection grade needs to reach IP68, the flame retardant grade needs to reach V0 grade, and key strict test tests such as high-low alternating temperature and humidity, salt fog resistance, tensile rate, thermal aging, oil stain resistance, pressure resistance, vibration resistance, insulativity, flame retardance and the like are required.

For example, the rubber ring of the connection transition of the inner and outer penetrating parts of the locking glan head of a high-voltage wire harness connector at a certain position is aged or reduced, contracted and loosened after the vehicle is sold for a long time, and the rubber ring at the locking glan head faces to the upper space or the inclined plane position. Some partial high-voltage components of the new energy vehicle are exposed outside, and in rainy season or in the time of drenching, the high-pressure locking head can flow to along the high-pressure wire harness, even if the inner rubber ring of the high-pressure locking Glan head is in IP (Internet protocol) grade 67-68, once the wire harness is bent too much, the risk of moisture prevention and water inflow can follow.

New energy automobile products are rapidly increased, markets are rapidly developed, and requirements on performance, functions and quality of parts are higher and higher. Therefore, in the coming years, high-voltage safety protection of new energy automobiles will become one of the important concerns of many manufacturers. Therefore, proper protection is particularly important.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an electric terminal box locking seal structure.

The purpose of the utility model is realized with the following mode: the utility model provides an electric terminal box locking seal structure, includes 1 body of electric terminal box, and 1 side of electric terminal box sets up locking glan head 2, sets up sealing rubber ring 21 in the locking glan head 2, and electric terminal box 1 connects high-pressure pencil 3 through locking glan head 2, and sealing rubber ring 21 cladding high-pressure pencil 3 periphery, set up gum cover 4 between sealing rubber ring 21 and the 3 peripheries of high-pressure pencil.

Further, at least one circle of sealing ring 41 is arranged on the inner wall of the rubber sleeve 4.

Further, the inner diameter of the seal ring 41 is smaller than the outer diameter of the high-pressure wire harness 3.

Furthermore, at least one circle of sealing ring 41 is arranged at the position where the outer wall of the rubber sleeve 4 is matched with the sealing rubber ring 21.

Further, the material of the rubber sleeve 4 is flame-retardant cross-linked polyvinyl chloride.

Compared with the prior art, the utility model discloses increase between sealed rubber ring and high-pressure wire harness outer wall and set up the gum cover for locking glan head appears ageing or diminishing shrink not hard up, or the pencil receives to bend when too big from the sealed rubber ring in area, and the gum cover still cooperates sealed rubber ring to rise tightly, provides protection safety guarantee for above-mentioned operating mode, increases the barrier propterty of high-pressure wire harness spare part. The fault rate of the insulation problem of the high-voltage system of the new energy vehicle is indirectly reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is an internal layered structure of a new energy high voltage wire harness, wherein fig. 2.1 is an unshielded cable; FIG. 2.2 is a shielded cable;

fig. 3 is a cross-sectional view of the present invention;

FIG. 4 is an enlarged view of FIG. 3;

fig. 5 is a schematic structural diagram of the rubber sleeve of the present invention, wherein fig. 5.1 is a front cross-sectional view of the rubber sleeve, and fig. 5.2 is a top view of the rubber sleeve.

Wherein, 1, the electric junction box; 11 connecting the copper plate; 12 an insulating plate; 13 terminal bolts; 14OT copper terminal; 15 double-wall insulating heat-shrinkable tube; 2 locking the gland head; 21, sealing a rubber ring; 22 an anti-interference shield ring; 3, high-voltage wiring harness; 31 a conductor layer; 32 an insulating layer; 33 a shielding layer; 34 a sheath layer; 35 high pressure bellows; 4, gluing a sleeve; 41 sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for the convenience of description and simplicity of description only, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

The noun interpretation: the locking Cable gland is also called a Cable waterproof joint and a Cable fixed head (Cable fixed head), is widely applied to the fixation and protection of wires and cables of mechanical equipment electrical, ship electrical and corrosion-resistant equipment, belongs to the parts which are commonly used in electrical equipment in the prior art and are used for locking and sealing wire bundles.

As shown in fig. 1-5, an electrical junction box locking and sealing structure comprises an electrical junction box 1 body, wherein a plurality of locking flange heads 2 are arranged on the periphery of the electrical junction box 1 in a penetrating manner and used for connecting and sealing a high-voltage wire harness, a sealing rubber ring 21 is arranged in each locking flange head 2, the high-voltage wire harness 3 penetrates through the locking flange heads 2 and is connected with the electrical junction box 1, the sealing rubber ring 21 covers the periphery of the high-voltage wire harness 3, a rubber sleeve 4 is arranged between the sealing rubber ring 21 and the periphery of the high-voltage wire harness 3, the rubber sleeve 4 can be a common rubber sleeve in the prior art, so that the sealing rubber ring 21 of the locking flange heads 2 is aged or becomes small and shrinks and becomes loose or the high-voltage wire harness 3 is bent too much, the rubber sleeve 4 is still matched with the sealing rubber ring 21 to be tensioned, a protection safety guarantee is provided for the working conditions, and the protection performance of the high-voltage wire harness 3 parts is improved. The fault rate of the insulation problem of the high-voltage system of the new energy vehicle is indirectly reduced.

The rubber sleeve 4 may be a cylinder as shown in fig. 5, at least one ring of sealing ring 41 is disposed on the inner wall of the rubber sleeve 4, preferably three or more rings of sealing rings 41 are disposed, and the rubber sleeve 4 pressed on the periphery of the high-voltage wire harness 3 passes through the sealing ring 41 due to the surface sealing effect, so that the moisture-proof and waterproof functions are further increased.

Further, the inner diameter of the sealing ring 41 is smaller than the outer diameter of the high-pressure wire harness 3, preferably, the inner diameter of the rubber sleeve 4 is also smaller than the outer diameter of the high-pressure wire harness 3, so that the rubber sleeve 4 is tightly pressed on the periphery of the high-pressure wire harness 3.

Furthermore, the rubber sleeve 4 is made of flame-retardant cross-linked polyvinyl chloride, and different manufacturers of the flame-retardant cross-linked polyvinyl chloride have slightly different chemical components, but the requirements of fire prevention, water prevention and sealing in the existing standard are met.

As another scheme, the sealing ring 41 is disposed at the position where the outer wall of the rubber sleeve 4 is matched with the sealing rubber ring 21, so that the moisture-proof and waterproof effects can be improved, but the effect is slightly inferior to that of the arrangement at the inner wall of the rubber sleeve 4, so that only as a parallel scheme, preferably, the two schemes are combined, that is, at least one circle of sealing ring 41 is disposed at the position where the outer wall of the rubber sleeve 4 is matched with the sealing rubber ring 21, and meanwhile, the corresponding sealing ring 41 is disposed at the inner wall of the rubber sleeve 4 on the same plane as that of each circle of sealing ring 41.

As shown in fig. 4, the installation step of the electrical junction box 1 by matching the high-voltage wire harness 3 with the rubber sleeve 4 comprises:

firstly, a high-voltage wire harness 3 connected with an electrical junction box 1 is inserted into the electrical junction box 1 from an OT copper terminal 14, the electrical junction box 1 can be a PDU (power distribution unit) box, a motor three-phase junction box and the like until a bolt hole of an internal connection copper plate of the electrical junction box 1 is fixedly connected through a terminal bolt 13, and an insulation plate 12 supporting the copper plate is arranged below an internal connection copper plate 11 of the electrical junction box 1 and is commonly called as insulation end wood.

From top to bottom in fig. 4, the root of the OT copper terminal 14 is connected to the insulating layer 32 by shrinkage and sealing after the double-walled insulating heat-shrinkable tube 15 is lined with hot melt adhesive, so as to prevent foreign matters or water drops from entering the OT copper terminal 14. The lower side of the double-wall insulating heat-shrinkable tube 15 is provided with an insulating layer 32, and the outer downward structure is formed by connecting and locking main parts inside the flange head 2 with the electric junction box 1 through an anti-interference shielding ring 22 and a sealing rubber ring 21. The rubber sleeve 4 is transited between the sealing rubber ring 21 of the locking gland head 2 and the outer sheath layer of the high-voltage wire harness 3. Half of the positions are in locking transition at the sealing rubber ring 21 of the locking gland head 2, and the other half of the positions are attached and shrunk on the sheath layer 34 of the high-voltage wiring harness 3. The lower structure behind the sheath layer 34 of the high-voltage wire harness 3 is that the double-wall insulation heat-shrinkable tube 15 is in transition connection with the high-voltage flame-retardant corrugated tube 35, and the double-wall insulation heat-shrinkable tube 15 is tightly wrapped on the flame-retardant corrugated tube 35 through inner wall hot melt adhesive after shrinking to prevent looseness.

The utility model discloses a locking glan head 2 to the high-voltage electric terminal box 1 is exclusively used in to the new forms of energy car and a section "high-pressure protection gum cover" of 3 sealed fire-retardant waterproof protections of high-pressure pencil, the new forms of energy trade advances with the current stage with the time, and high-pressure pencil 3 constantly optimizes in the high-voltage system in the pure electric vehicle chassis, falls this, fire-retardant, temperature resistant, safety protection and becomes the apolegamy key factor. In order to be better suitable for transition connection safety assembly of the locking gland head 2 in the new energy high-voltage electric junction box 1 and match the transition connection safety assembly, the orange diameter-variable flame-retardant silica gel ring has multiple types of diameter-variable silica gel rings which pass through fireproof and waterproof sealing requirements in new energy vehicle industry standards GB4208 and GB2408, the IP protection grade of the orange diameter-variable flame-retardant silica gel ring which penetrates through, is adhered and compressed on an outer sheath layer of a high-voltage wire harness 3 reaches IP68, the flame-retardant grade needs to reach a V0 grade, and key strict test tests such as high-low alternating temperature and humidity, salt fog, tensile resistance, thermal aging, oil stain resistance, pressure resistance, vibration resistance, insulativity, flame retardance and the like are carried out. And also meets the high-voltage safety requirement of class B voltage (GB/T18384).

The high-voltage wire harness 3 is always immersed in siphonage, the sealing performance level of the three-ring sealing ring silica gel ring waterproof material with the special structure represents the capability of solving the conventional problem of the orange high-voltage wire harness for the new energy vehicles in the market, and the non-recurrence of siphonage in water immersion is the key for verifying whether the high-voltage wire harness 3 is qualified.

Locking the 3 waterproof silica gel circle materials of high-pressure pencil of glan head 2 outgoing lines, for the aspect of new forms of energy real vehicle high-pressure pencil design and the apolegamy of pencil material provide effectual data support, and then accomplish waterproofly, fire-retardant, realize considerable pencil cost reduction when sealed through observing the current-carrying capacity and further optimizing pencil bore specification at the design stage, at present use in the high-pressure electric terminal box 1 locking glan head 2 department orange gum cover of real vehicle, possess good protection sealed effect and also reduced the probability that naked leaky wire restraints soaks water electrical safety accident, new forms of energy product advantage has been promoted, high-pressure security has been strengthened.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the general inventive concept, and it is intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims (5)

1. The utility model provides an electric terminal box locking seal structure, includes electric terminal box (1) body, and electric terminal box (1) side sets up locking glan head (2), sets up sealing rubber ring (21) in locking glan head (2), and electric terminal box (1) is through locking glan head (2) connection high-pressure pencil (3), sealing rubber ring (21) cladding high-pressure pencil (3) periphery, its characterized in that: and a rubber sleeve (4) is arranged between the sealing rubber ring (21) and the periphery of the high-voltage wire harness (3).

2. The locking and sealing structure of an electrical junction box according to claim 1, wherein: the inner wall of the rubber sleeve (4) is provided with at least one circle of sealing ring (41).

3. The locking and sealing structure of an electrical junction box according to claim 2, wherein: the inner diameter of the sealing ring (41) is smaller than the outer diameter of the high-pressure wire harness (3).

4. The locking and sealing structure of an electrical junction box according to claim 1, wherein: and at least one circle of sealing ring (41) is arranged at the position where the outer wall of the rubber sleeve (4) is matched with the sealing rubber ring (21).

5. The locking and sealing structure of an electrical junction box according to claim 1, wherein: the rubber sleeve (4) is made of flame-retardant cross-linked polyvinyl chloride.

Images