CN201498245U - A new type of shielded cable - Google Patents

Abstract

The utility model relates to a new type of shielded cable, which comprises an outer layer tape, an outer shielding structure outside the outer layer tape and an outer sheath outside the outer shielding structure. There are multiple groups of multi-core wire harnesses bundled inside the outer layer tape, and multiple The core wire harness is composed of insulated wire core groups and inner shielding structures in sequence from the inside to the outside, and an inner insulating sheath is provided outside the inner shielding structure of each multi-core wire harness. Each shielding layer of the cable can be grounded separately according to requirements, which further enhances the shielding performance of the shielded cable.

Description

A new type of shielded cable

technical field

The utility model relates to a cable, in particular to a shielded cable.

Background technique

At present, cables have been widely used in various industries such as industrial production and transportation. With the special requirements of various industries, the varieties of cables are constantly updated and improved. In the field of information transmission, shielded cables with shielding layers are widely used to ensure the accuracy of signal transmission.

The anti-interference principle of the shielding layer is mainly to use the field strength in the shielding layer to be zero everywhere, and the shielding layer is grounded to prevent the influence of the conductor in the external shielding layer; in addition, when the conductor in the shielding layer flows through the current, an induced current will be generated in the shielding layer . Grounding the shielding layer is the best measure to eliminate external electromagnetic field induction and internal electric field induced current.

In the three-dimensional space, there are two kinds of interference energy, electric field and magnetic field, at the same time. At the same time, it has become a mature technology to shield the electromagnetic field with aluminum foil and copper mesh around the cladding. But if the value of the transmitted signal is small, the transmission distance is long, and the amplitude and phase of the signal transmission are very strict, using multiple shielding materials can increase the shielding effect. When signals are transmitted over long distances, according to engineering application requirements, sometimes both ends of the transmission line are required to be grounded, and sometimes only one end of the transmission line is required to be grounded. In some practical environments, it is very common that the grounding point is far away, the grounding resistance is different, and there is a potential difference between two grounding points. At this time, when multiple sets of signals are transmitted at the same time, the electromagnetic field of one set of signals During parallel transmission, it will be coupled into another group of signal cables through the shielding layer, thereby affecting the transmission accuracy of the other group of signals, and vice versa.

In some special applications, when independent signals of weak magnitude are transmitted, each group of signals has special requirements for its own shielding and grounding methods, and it does not necessarily require its shielding layers to be grounded at the same time, such as electronic current-voltage combination There are very strict requirements on the grounding point and grounding method when the analog signal of the transformer is transmitted. However, there is no insulation between the inner shielding layers in the existing shielded cables, or there is no insulation between the inner shielding layer and the outer shielding layer. For example, in the technology disclosed in the patent specification with application number 200520025391.9, a shielded four-wire group structure is adopted. From the inside to the outside, it is composed of a unit group, a skin foam insulation layer, and an inner shielding layer. However, the inner shielding layer of each shielded four-wire group is made of a single material and is not insulated from each other. Good shielding effect.

Utility model content

The purpose of the utility model is to provide a new type of shielded cable, each shielding layer of the cable can be grounded separately according to the requirement, which further enhances the shielding performance of the shielded cable.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a new type of shielded cable, including an outer layer tape, an outer shielding structure outside the outer layer tape, and an outer sheath outside the outer shielding structure, and the outer layer tape There are multiple sets of multi-core wire harnesses bundled inside. The multi-core wire harnesses are composed of insulated wire core groups and inner shielding structures from the inside to the outside. Each multi-core wire harness is equipped with an inner insulating sheath outside the inner shielding structure.

The insulated wire core group is composed of more than two twisted insulated wire cores.

The inner shielding structure is a single shielding layer or double shielding layer structure, and the outer shielding structure is a single shielding layer or double shielding layer structure.

The two shielding layers in the double shielding layer structure are connected to each other.

Each layer in the single shielding layer structure and the double shielding layer structure is a metal foil shielding layer or a metal mesh shielding layer.

Internal filling layers are arranged in gaps in each internal shielding structure.

An outer filling layer is arranged in the gap outside each inner insulating sheath.

In the new shielded cable described in the utility model, the inner shielding structure of each multi-core wire harness is covered by an inner insulating sheath, so that the inner shielding structures are insulated from each other, and the inner shielding structure and the outer shielding structure The shielding layers are insulated from each other, so that the shielding layers can be grounded separately according to the requirements, which enhances the shielding performance of the shielded cable; the use of multi-strand insulated cores effectively enhances the anti-interference ability.

Description of drawings

Fig. 1 is a kind of embodiment of the present utility model;

Fig. 2 is another kind of embodiment of the present utility model;

Fig. 3 is the third kind of embodiment of the present utility model;

Fig. 4 is the fourth embodiment of the present utility model.

Detailed ways

Embodiment one

As shown in Figure 1, it is a schematic diagram of a cable structure in which both the inner and outer shielding structures are double shielding layers. The utility model comprises a conductor 1, an insulating layer 2, an inner filling layer 3, an inner tape layer 4, an inner layer 51 of an inner shielding structure, an outer layer 52 of an inner shielding structure, an inner sheath 6, an outer filling 7, and an outer tape layer 8. The inner layer 91 of the outer shielding structure, the outer layer 92 of the outer shielding structure, and the outer sheath 10 . Extrude polyvinyl chloride insulation layer 2 on the outer surface of the conductor 1 with oxygen-free copper wire to form an insulated wire core, use two insulated wire cores to twist into a pair of twisted wire groups, and fill between the twisted wire group and the tape layer 4 There is an inner filling layer 3, and the twisted wire group and the inner packing layer 3 are wrapped around the inner tape layer 4 to fix the twisted wire group, and the inner layer shielding structure of the inner shielding layer with a double-layer structure is arranged outside the inner tape layer The inner layer 51 and the outer layer 52 of the inner shielding structure are the aluminum foil shielding layer and the copper mesh shielding layer respectively. cable; the outer filling layer 7 is filled between the two inner cables and the outer cladding layer 8, and the inner cable is fixed, and the outer shielding structure inner layer 91 and the outer shielding structure of the outer shielding layer of the double-layer structure are arranged in sequence outside it. The outer layer 92 is an aluminum foil shielding layer and a copper mesh shielding layer respectively, and the two shielding layers are connected to each other to form an outer shielding structure, and an outer sheath 10 made of polyvinyl chloride or other materials is extruded outside the outer shielding layer of the double-layer structure.

The inner shielding structure and the outer shielding structure in Embodiment 1 are both double-layer shielding structures, and the combination of shielding layers in each double-layer shielding structure is an inner foil and an outer mesh. Of course, there are many choices and combinations for each layer of the double-layer shielding structure. The shielding structure and the outer shielding structure can be used in any combination, and the combination of copper mesh shielding layer and aluminum foil shielding layer for the inner and outer shielding structures is the best.

In the first embodiment, the insulating layer 2 is made of polyvinyl chloride, but of course other insulating materials can also be used.

In Embodiment 1, each shielding layer is a copper mesh shielding layer or an aluminum foil shielding layer, and of course it can also be a shielding layer of other materials.

In the first embodiment, the inner sheath 6 and the outer sheath 10 are made of polyvinyl chloride, but of course other insulating materials can also be used.

To illustrate the problem, embodiment 1 sets two inner cables, each inner cable contains two insulated wire cores, and multiple inner cables can also be used in the implementation, which can be 2, 3, 4, etc., each The inner cable can be twisted with multiple insulated wire cores, which can be 2, 3, 4, etc. However, the number of inner cables and the number of insulated wire cores contained in the inner cables have nothing to do with the invention of the present invention. s Choice.

Embodiment two

As shown in FIG. 2 , it is a schematic diagram of a cable structure in which the inner shielding structure of the double-layer structure and the outer shielding structure of the single-layer structure are matched with each other. The difference from Embodiment 1 is that the outer shielding structure 9 is a single-layer structure, and a copper mesh shielding layer is used. Other parts are all the same as in Embodiment 1.

The inner shielding structure in the second embodiment is a double-layer shielding structure of inner foil and outer mesh, and the outer shielding structure is a single-layer shielding structure of copper mesh shielding layer. Of course, there are many choices and combinations for each layer of the double-layer shielding structure. For example, the combination of shielding layers in the double-layer shielding structure can also choose inner foil and outer foil, inner mesh and outer mesh, inner mesh and outer foil, and single-layer shielding. The structure can also choose the aluminum foil shielding layer, the inner shielding structure and the outer shielding structure can be used in any combination, and the combination of the inner shielding structure and the outer shielding layer is the best.

Embodiment three

As shown in FIG. 3 , it is a schematic diagram of a cable structure in which the inner shielding structure of the single-layer structure and the outer shielding structure of the double-layer structure are matched with each other. The difference from the first embodiment is that the inner shielding structure 5 is a single-layer structure, and a copper mesh shielding layer is used. Other parts are all the same as in Embodiment 1.

The outer shielding structure in the third embodiment is a double-layer shielding structure of inner foil and outer mesh, and the inner shielding structure is a single-layer shielding structure of copper mesh shielding layer. Of course, there are many choices and combinations for each layer of the double-layer shielding structure. For example, the combination of shielding layers in the double-layer shielding structure can also choose inner foil and outer foil, inner mesh and outer mesh, inner mesh and outer foil, and single-layer shielding. The structure can also choose the aluminum foil shielding layer, the inner shielding structure and the outer shielding structure can be used in any combination, and the combination of the outer shielding structure and the inner shielding layer is the best.

Embodiment four

As shown in FIG. 4 , it is a schematic diagram of a cable structure in which the inner and outer shielding structures are both single shielding layer structures. The difference from Embodiment 1 is that: the outer shielding structure 9 is a single-layer structure, using a copper mesh shielding layer; the inner shielding structure 5 is a single-layer structure, using an aluminum foil shielding layer. Other parts are all the same as in Embodiment 1.

The outer shielding structure in the fourth embodiment is a single-layer shielding structure of copper mesh shielding layer, and the inner shielding structure is a single-layer shielding structure of aluminum foil shielding layer. Of course, there are many ways to match the inner and outer shielding structures, for example, the outer shielding structure is a copper mesh shielding layer, the inner shielding structure is an aluminum foil shielding layer; the outer shielding structure is an aluminum foil shielding layer, and the inner shielding structure is an aluminum foil Shielding layer; the outer shielding structure is an aluminum foil shielding layer, and the inner shielding structure is a copper mesh shielding layer. Among them, the combination of inner and outer shielding structure with aluminum foil shielding layer and copper mesh shielding layer is the best.

Claims (7)

1. shield cable, comprise outer band, the outer band outer shielding structure outward and the outer protective sleeve of outer shielding structure outside, many group multicore wire harness have been tied up in the outer band, the multicore wire harness is made of insulated wire cores group, inner shield structure from the inside to the outside successively, it is characterized in that: the inner shield structure of each multicore wire harness is equipped with the primary insulation sheath outward.

2. shield cable as claimed in claim 1 is characterized in that: described insulated wire cores group is made of stranded insulated wire cores more than two.

3. shield cable as claimed in claim 1 or 2 is characterized in that: the inner shield structure is single screen or double shield layer structure, and outer shielding structure is single screen or double shield layer structure.

4. shield cable as claimed in claim 3 is characterized in that: two screen mutual conduction in the described double shield layer structure.

5. shield cable as claimed in claim 4 is characterized in that: each layer is metal forming screen or metal mesh shield layer in described single shielding layer structure and the double shield layer structure.

6. shield cable as claimed in claim 5 is characterized in that: be provided with inner packed layer in the gap in described each inner shield structure.

7. shield cable as claimed in claim 6 is characterized in that: be provided with outside packed layer in the gap in each outside the insulating sleeve.

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