CN210956265U

CN210956265U - Pre-branch cable

Info

Publication number: CN210956265U
Application number: CN201922336417.6U
Authority: CN
Inventors: 甄梦娇; 佟阳阳; 彭雄; 王松
Original assignee: Zhejiang Chint Electric Cable Co ltd
Current assignee: Zhejiang Chint Electric Cable Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-07-07
Anticipated expiration: 2029-12-24

Abstract

The utility model discloses a branch cable in advance can cut the interference current who comes from the branch line effectively, alleviates main cable's electromagnetic interference to alleviate the influence to other connecting circuit and equipment. The key points of the technical scheme are as follows: the utility model provides a branch cable in advance, includes trunk cable, branch line and insulating sheath, is equipped with at least one wave filter that is used for reducing electromagnetic interference in the insulating sheath, and the wave filter is connected with the cable core of branch line, and the cable core of branch line passes through the wave filter and the cable core parallel crimping of trunk cable, and the wave filter reaches the purpose that reduces electromagnetic interference through filtering the clutter current that comes from the branch line. Compared with the prior art, adopt the utility model discloses a branch cable in advance filters the current noise of branch line through the wave filter that sets up in insulating sheath, reduces the electromagnetic interference to trunk cable, is favorable to the electric current stability of each branch line to guarantee the equipment on each circuit and normally work.

Description

Pre-branch cable

Technical Field

The utility model relates to a cable branch technical field in advance specifically is a branch cable in advance.

Background

The pre-branch cable is a cable for prefabricating branch lines according to a user design drawing when a main cable is produced in a factory, is a new technical product in recent years, and has excellent shock resistance, air tightness and waterproofness compared with the prior art. The cable branch line is manufactured on the main cable in advance by a factory, the section size of the branch line, the length of the branch line and the like are determined according to design requirements, the construction period is greatly shortened, the material cost and the construction cost are greatly reduced, and the reliability of power distribution is greatly ensured. The pre-branch cable is composed of four parts: trunk cables, branch lines, branch splices, and other related accessories, and have three types: normal type, flame retardant (ZR), flame retardant (NH). The pre-branch cable is a substitute product for supplying power to a bus duct in a high-rise building, has the advantages of reliable power supply, convenient installation, good waterproofness, small occupied building area, low failure rate, low price, maintenance-free property and the like, and is suitable for a distribution line with the AC rated voltage of 0.6/1 KV. The vertical power supply system is widely applied to vertical power supply in high and medium-rise buildings, residential buildings, commercial buildings, hotels and hospital electrical shafts, and is also applicable to power supply systems of tunnels, airports, bridges, highways and the like.

However, the existing pre-branch cable technology still has the following disadvantages:

1. since the branch line needs to be connected to various instruments and devices, these instruments and devices generate certain interference currents, including differential mode interference currents and common mode interference currents, which are directly conducted into the main cable and then transmitted to other circuits or devices to be affected by electromagnetic interference.

2. The insulation sleeve of the existing pre-branch cable is not provided with a reinforcing device between a branch line and a main cable, and because the branch line is often required to be pulled outwards in various directions, and in addition, the problem of aging caused by long service life is solved, the branch line and the main cable are easy to break, and the safety problem is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a branch cable in advance can cut the interference current who comes from the branch line effectively, alleviates main cable's electromagnetic interference to alleviate the influence to other connecting circuit and equipment.

In order to achieve the purpose of the invention, the utility model adopts the following technical scheme:

the utility model provides a branch cable in advance, includes trunk cable, branch line and insulating sheath, is equipped with at least one wave filter that is used for reducing electromagnetic interference in the insulating sheath, and the wave filter is connected with the cable core of branch line, and the cable core of branch line passes through the wave filter and the cable core parallel crimping of trunk cable, and the wave filter reaches the purpose that reduces electromagnetic interference through filtering the clutter current that comes from the branch line.

Compared with the prior art, the pre-branch cable adopting the technical scheme has the following beneficial effects: adopt the utility model discloses a branch cable in advance filters the interference current of each branch line through the wave filter that sets up in insulating sheath and falls, avoids interference current to pass through other circuits of trunk cable influence and equipment, is favorable to the electric current stability of each branch circuit to guarantee the equipment on each circuit and normally work.

Preferably, the filter is detachably connected with the insulating sheath, different filters can be installed according to the type of the connected branch line, and the maintenance and replacement of the filter are facilitated.

Preferably, the lower end of the insulating sheath is provided with at least one reinforcing mechanism for preventing the insulating sheath from cracking, and as the branch line is usually required to be pulled outwards in various directions and the aging problem caused by long service life is solved, the branch line and the trunk cable are easy to break, so that the safety problem is generated, and the reinforcing mechanism can effectively avoid the breakage of the insulating sheath.

Preferably, the branch line extends outwards from the lower end part of the insulating sheath and is connected to the related equipment, a spiral part for preventing the cable from being twisted off is arranged at the joint of the branch line and the insulating sheath, the spiral part not only prevents the branch line from being broken when the branch line is twisted transversely, but also can provide a longitudinal buffer effect, and the possibility of twisting off the cable is further reduced.

Preferably, the branch line is provided with at least one section of bending part for increasing the buffering effect, the bending part is located inside the insulating sheath and is close to the lower end of the insulating sheath, and when the branch line is pulled down, due to the buffering effect of the bending part, the cable core of the branch line is not easy to separate from other connecting mechanisms, so that the connection stability is enhanced.

Preferably, the branch line is close to insulating sheath department and is equipped with one section at least fire-retardant layer, and certain branch line may lead to the sinle silk high temperature because short circuit or overload, leads to the parcel layer burning of cable, and the burning of parcel layer can be blocked to fire-retardant layer, avoids the burning diffusion to insulating sheath and trunk cable.

Preferably, the reinforcing mechanism is a rigid metal ring, the metal ring is located inside the insulating sheath and does not contact with the cable cores of the trunk cable and the branch cable, and the metal ring is located inside the insulating sheath, so that the corrosion and oxidation problems can be avoided, and the service life of the metal ring can be prolonged.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the pre-branching cable of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the present embodiment.

Fig. 3 is a bottom cross-sectional view of the present embodiment.

Fig. 4 is a partially enlarged schematic view of the spiral portion in the present embodiment.

Fig. 5 is a partially enlarged view of the bent portion in the present embodiment.

Reference numerals: 1. a trunk cable; 2. a branch line; 20. a flame retardant layer; 21. a bending section; 3. an insulating sheath; 30. a filter; 31. a metal ring; 4. a spiral portion.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The pre-branch cable shown in fig. 1 and 2 comprises a main cable 1, a branch line 2 and an insulating sheath 3, wherein a filter 30 is arranged in the insulating sheath 3, the filter 30 is connected with a cable core of the branch line 2, and the filter 30 is used for filtering current noise from the branch line 2 and reducing electromagnetic interference of the main cable 1; the cable core of the branch line 2 passes through the filter 30 and then is connected in parallel and pressed with the cable core of the main cable 1. Branch line 2 is equipped with one section fire-retardant layer 20 near insulating sheath 3 department, and fire-retardant layer 20 can block the burning on cable wrapping layer, avoids burning diffusion to insulating sheath 3 and main cable 1.

The bottom of the insulating sheath 3 is also provided with a rigid metal ring 31 with a reinforcing function. Fig. 3 is the utility model discloses branch cable's bottom sectional view in advance, as shown in fig. 3, ferrule 31 inlays in insulating sheath 3 inside, ferrule 31 is a closed annular, its shape is corresponding with insulating sheath 3's cross section, ferrule 31 is located branch line 2 and trunk cable 1 periphery and does not contact with trunk cable 1 and branch line 2's cable core, be located insulating sheath 3 inside ferrule 31 and can avoid corroding and the oxidation problem, be favorable to prolonging ferrule 31's life.

As shown in fig. 4, the branch line 2 extends outwards from the lower end of the insulating sheath 3 to be connected to the relevant equipment, a spiral part 4 is arranged at the joint of the branch line 2 and the insulating sheath 3, the spiral part 4 is made of soft rubber with good toughness, the spiral part 4 is used for preventing the branch line 2 from being broken due to left-right twisting, the upper end of the spiral part 4 is integrated with the insulating sheath 3, and the inner wall of the spiral part 4 is fixedly attached to the outer wall of the branch line 2. The spiral portion 4 not only prevents the branch line 2 from being broken when twisted transversely, but also provides a longitudinal buffer function, and further reduces the possibility of twisting off the cable.

As shown in fig. 5, the branch line 2 is provided with a section of bending portion 21, the bending portion 21 is located inside the insulating sheath 3 and close to the lower end of the insulating sheath 3, so that a certain buffering effect can be provided, when the branch line 2 is pulled downwards, due to the buffering effect of the bending portion 21, the cable core of the branch line 2 is not easily separated from other connecting mechanisms, and the stability of connection is enhanced.

The above description is a preferred embodiment of the present invention, and a person skilled in the art can make several modifications and improvements without departing from the principles of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A pre-branch cable comprises a trunk cable (1), branch lines (2) and an insulating sheath (3), and is characterized in that: at least one filter (30) for reducing electromagnetic wave interference is arranged in the insulating sheath (3), the filter (30) is connected with the cable core of the branch line (2), and the cable core of the branch line (2) is connected with the cable core of the main cable (1) in parallel and in pressure joint through the filter (30).

2. The pre-branch cable of claim 1, wherein: the filter (30) is detachably connected with the insulating sheath (3).

3. The pre-branch cable of claim 1, wherein: the lower end part of the insulating sheath (3) is provided with at least one reinforcing mechanism for preventing the insulating sheath from cracking.

4. The pre-branch cable of claim 1, wherein: the branch line (2) extends outwards from the lower end part of the insulating sheath (3) and is connected to relevant equipment, and a spiral part (4) for preventing the cable from being twisted off is arranged at the joint of the branch line (2) and the insulating sheath (3).

5. The pre-branch cable of claim 1, wherein: the branch line (2) is provided with at least one section of bending part (21) for increasing the buffering effect, and the bending part (21) is located inside the insulating sheath (3) and close to the lower end of the insulating sheath (3).

6. The pre-branch cable of claim 1, wherein: at least one section of flame retardant layer (20) is arranged at the position of the branch line (2) close to the insulating sheath (3).

7. The pre-branch cable of claim 3, wherein: the reinforcing mechanism is a rigid metal ring (31), and the metal ring (31) is located in the insulating sheath (3) and does not contact with the cable cores of the trunk cable (1) and the branch cable (2).