Lightweight coaxial line and cable

Abstract

The embodiment of the invention mainly relates to the technical field of cables, in particular to a lightweight coaxial line and a cable. A lightweight coaxial line includes: a center conductor; an insulating layer provided around an outer peripheral side of the center conductor; the metal foil shield is arranged around the peripheral side of the insulating layer; the shielding layer is arranged around the peripheral side of the metal foil shield, the shielding layer comprises a metal wire shielding area and a gap area, the metal wire shielding area comprises a plurality of metal wires which are adjacent in pairs and are arranged in an attached mode, and the metal wire shielding area accounts for 1 / 7-1 / 9 of the shielding layer; and the sheath is arranged around the peripheral side of the shielding layer. According to the lightweight coaxial line and the cable in the embodiment of the specification, on the premise that the performance of the coaxial line is not reduced, the weight of the coaxial line is reduced by arranging the shielding layer into the metal wire shielding area and the gap area and changing the polyester wrapping tape into the metal foil shielding mode, and then the weight of the cable is reduced; and finally, the operation convenience of the medical ultrasonic instrument can be improved.

Description

Technical Field

[0001] The embodiments of this specification mainly relate to the field of cable technology, and specifically to a lightweight coaxial line and cable. Background Art

[0002] As people's living standards improve, their health needs are also increasing, and accordingly, medical ultrasound devices, which are commonly used for diagnosis, are also widely used. In order to make the diagnostic images of medical ultrasound devices clearer, more three-dimensional, and more colorful, the cables of medical ultrasound devices need to have more channels. Since the channels correspond to the coaxial lines one by one, the cables of medical ultrasound devices need to be formed by more coaxial lines. However, the increase in coaxial lines will increase the overall weight of the cable, which in turn makes the operation of medical ultrasound devices more difficult. Summary of the invention

[0003] In view of the problems existing in the prior art, the embodiments of this specification propose a lightweight coaxial line and cable, which reduces the weight of the cable by reducing the weight of the coaxial line without reducing the performance of the coaxial line, thereby improving the operating convenience of the medical ultrasonic device.

[0004] In a first aspect, an embodiment of the present specification provides a lightweight coaxial line, including: Center conductor; An insulating layer is disposed around the outer circumference of the central conductor; a metal foil shield disposed around an outer peripheral side of the insulating layer; A shielding layer is arranged around the outer peripheral side of the metal foil shielding, the shielding layer includes a metal wire shielding area and a gap area, the metal wire shielding area includes a plurality of metal wires that are adjacent to each other and arranged in close contact, and the metal wire shielding area occupies 1 / 7 to 1 / 9 of the shielding layer; The sheath is arranged around the outer circumference of the shielding layer.

[0005] Preferably, the central conductor comprises a plurality of guide wires intertwined with each other, and the material of the guide wires is one of silver-plated silver-copper alloy, silver-plated tin-copper alloy, silver-plated pure copper, tin-plated tin-copper alloy, and tin-plated pure copper.

[0006] Preferably, the central conductor comprises 7 guide wires which are intertwined with each other, and the material of the guide wires is silver-plated silver-copper alloy.

[0007] Preferably, the thickness of the insulating layer is between 0.04 mm and 0.5 mm; the insulating layer is made of foamed PFA material or foamed FEP material.

[0008] Preferably, the thickness of the insulating layer is 0.35 mm; the insulating layer is made of foamed PFA material.

[0009] Preferably, the thickness of the metal foil shield is between 0.0046 mm and 0.012 mm.

[0010] Preferably, the thickness of the metal foil shield is 0.01 mm.

[0011] Preferably, the metal wire shielding area occupies 1 / 8 of the shielding layer; the metal wire shielding area covers the connection gap of the metal foil shielding.

[0012] Preferably, the thickness of the sheath is between 0.005 mm and 0.1 mm; the material of the sheath is one of polyester tape, PFA adhesive or FEP adhesive.

[0013] In a second aspect, an embodiment of the present specification provides a lightweight cable, comprising the lightweight coaxial cable of the first aspect, and a polyester wrapping tape layer arranged around multiple lightweight coaxial cables, a shielding layer arranged around the outer circumference of the polyester wrapping tape layer, and an outer sheath arranged around the outer circumference of the shielding layer.

[0014] Beneficial Effects The lightweight coaxial line and cable in the embodiments of this specification, without reducing the performance of the coaxial line, reduce the weight of the coaxial line and then reduce the weight of the cable by setting the shielding layer as a metal wire shielding area and a gap area and changing the polyester wrapping tape to a metal foil shielding, thereby improving the operating convenience of the medical ultrasonic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a lightweight coaxial line provided in an embodiment of this specification. DETAILED DESCRIPTION

[0016] Embodiments of the present specification will be described in more detail below with reference to the accompanying drawings.

[0017] Embodiment 1: The coaxial line in the prior art includes a central conductor, an insulating layer arranged around the outer periphery of the central conductor, a polyester wrapping tape arranged around the outer periphery of the insulating layer, a shielding layer arranged around the outer periphery of the polyester wrapping tape (the shielding layer is usually a circle of metal wire shielding), and a sheath arranged around the outer periphery of the shielding layer. The coaxial line of this structure is heavy. When the cable of a medical ultrasonic instrument is formed by many coaxial lines of this structure, the cable of the medical ultrasonic instrument will be heavy, which will increase the difficulty of operating the medical ultrasonic instrument.

[0018] To this end, this embodiment proposes a lightweight coaxial line, which reduces the weight of the coaxial line by improving the specific structure of the coaxial line while ensuring the performance of the coaxial line.

[0019] The lightweight coaxial line in this embodiment, such as Figure 1As shown, it includes a center conductor 1, an insulating layer 2, a metal foil shield 3, a metal wire shield area 4 and a sheath 5.

[0020] The center conductor 1 includes a plurality of mutually intertwined guide wires, and the guide wires are one of silver-plated silver-copper alloy, silver-plated tin-copper alloy, silver-plated pure copper, tin-plated tin-copper alloy, and tin-plated pure copper. In this embodiment, the center conductor 1 specifically includes 7 mutually intertwined guide wires, and the material of the guide wires is specifically silver-plated silver-copper alloy.

[0021] The insulating layer 2 is arranged around the outer peripheral side of the central conductor 1. The thickness of the insulating layer 2 can be between 0.04 mm and 0.5 mm. In the present embodiment, the thickness of the insulating layer 2 is specifically 0.35 mm. The insulating layer 2 can be made of foamed PFA (i.e., tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer) material or foamed FEP (i.e., perfluoroethylene propylene copolymer) material. In the present embodiment, the insulating layer 2 is specifically made of foamed PFA material.

[0022] The metal foil shield 3 is arranged around the outer peripheral side of the insulating layer 2. The thickness of the metal foil shield 3 may be between 0.0046 mm and 0.012 mm. In this embodiment, the thickness of the metal foil shield 3 is specifically 0.01 mm. The insulating layer 2 is relatively soft, and the metal foil shield 3 can protect the insulating layer 2 and can also play a shielding role.

[0023] The shielding layer is arranged around the outer periphery of the metal foil shielding 3. The shielding layer includes a metal wire shielding area 41 and a gap area 42. The metal wire shielding area 41 includes a plurality of metal wires that are adjacent to each other and arranged in close proximity. The metal wire shielding area 41 occupies 1 / 7 to 1 / 9 of the shielding layer.

[0024] In this embodiment, the metal wire shielding area 41 occupies 1 / 8 of the shielding layer. Assuming that a total of 40 metal wires can be arranged on the outer peripheral side of the metal foil shielding 3, the metal wire shielding area 41 includes 5 metal wires.

[0025] In addition, in this embodiment, the metal wire shielding area 41 covers the connection gap of the metal foil shielding 3, and compared with being set at other positions, the same shielding effect can be achieved with fewer metal wires. That is, when the shielding effect is the same, the metal wire shielding area 41 covers the connection gap of the metal foil shielding 3, which can reduce the number of metal wires in the metal wire shielding area 41, thereby making the coaxial line lighter.

[0026] The sheath 5 is arranged around the outer peripheral side of the shielding layer. The thickness of the sheath 5 can be between 0.005 mm and 0.1 mm. In the present embodiment, the thickness of the sheath 5 is specifically 0.03 mm. The material of the sheath 5 can be one of polyester tape, PFA (i.e., tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer) rubber, or FEP (i.e., perfluoroethylene propylene copolymer) rubber. In the present embodiment, the material of the sheath 5 is specifically polyester tape.

[0027] The shielding layer in the prior art is a circle of metal wire shielding. In this example, the weight of the coaxial line can be reduced by setting the shielding layer as a metal wire shielding area and a gap area. In order to ensure the shielding effect, the polyester wrapping tape is replaced with a metal foil shielding in this embodiment, and the metal foil shielding can also play a role in protecting the insulating layer 2.

[0028] Although the coaxial line can be lightened by setting the shielding layer as the metal wire shielding area and the gap area, the lightweight coaxial line in this embodiment is mainly used to form the cable of medical ultrasonic equipment, and the performance of the cable must meet the requirements, that is, the electrical performance parameters of the coaxial line must meet the requirements. The electrical performance parameters of the coaxial line are specifically: attenuation is less than 1.6dB / m; capacitance is 54±5pF / m; characteristic impedance is 85±10Ω.

[0029] The electrical performance of the coaxial line is specifically related to the number and material of the conductor wires of the center conductor 1, the thickness and material of the insulating layer 2, the thickness of the metal foil shielding, and the proportion of the metal wire shielding area relative to the shielding layer. The coaxial line desired in this embodiment is as light as possible while meeting the electrical performance parameters.

[0030] After a lot of tests, in this embodiment, the central conductor 1 is set to 7 wires and the material of the wires is silver-plated silver-copper alloy, the thickness of the insulating layer 2 is set to 0.35mm and the material of the insulating layer 2 is foamed PFA, the shielding is set to metal foil shielding 3 and shielding layer, and the thickness of the metal foil shielding 3 is set to 0.01mm, and the metal wire shielding area 41 is set to occupy 1 / 8 of the shielding layer. At this time, the attenuation of the coaxial line in this embodiment is 1.4dB / m; the capacitance is 54pF / m; the characteristic impedance is 85.2Ω, the electrical performance parameters of the coaxial line meet the requirements, and the weight of the coaxial line in this embodiment is as light as possible.

[0031] The weight of the lightweight coaxial line in this example is compared with that of the coaxial line in the prior art. Through testing, it is found that the weight of 1 meter of the lightweight coaxial line in this example is 0.165g, which is 45% lighter than the weight of 1 meter of the existing coaxial line (0.300g). That is, the coaxial line in this embodiment can reduce the weight of the coaxial line by 45% compared with the weight of the ordinary coaxial line while ensuring that the electrical performance parameters meet the requirements, and has the effect of lightweighting the coaxial line.

[0032] Embodiment 2: A lightweight cable comprises the lightweight coaxial cable in Example 1, a polyester wrapping tape layer arranged around a plurality of lightweight coaxial cables, a shielding layer arranged around the outer circumference of the polyester wrapping tape layer, and an outer sheath arranged around the outer circumference of the shielding layer. The thickness of the outer sheath may be between 0.1 mm and 2.5 mm, and the material of the outer sheath may be one of PVC (i.e. polyvinyl chloride), TPU (i.e. thermoplastic polyurethane), and silicone. In this embodiment, the thickness of the outer sheath is specifically 1.2 mm, and the material of the outer sheath is specifically PVC.

[0033] The cable is made up of multiple lightweight coaxial lines. Since the coaxial lines are lighter, the cables will inevitably be lighter. After testing, it was found that the weight of 1 meter of lightweight cable is 30% lighter than that of 1 meter of ordinary cable. Since the cable is lighter (without reducing the performance of the coaxial line), it can improve the operating convenience of medical ultrasound equipment.

[0034] Although some embodiments of the present specification are shown in the drawings, it should be understood that the present specification can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. Instead, these embodiments are provided for a more thorough and complete understanding of the present specification. It should be understood that the drawings and embodiments of the present specification are only for exemplary purposes and are not intended to limit the scope of protection of the present specification.

Claims

1. A lightweight coaxial line, characterized in that: include: Center conductor (1); An insulating layer (2) is arranged around the outer circumference of the central conductor (1); A metal foil shield (3) is arranged around the outer peripheral side of the insulating layer (2); a shielding layer, arranged around the outer circumference of the metal foil shield (3), the shielding layer comprising a metal wire shielding area (41) and a gap area (42), the metal wire shielding area (41) comprising a plurality of metal wires adjacent to each other and arranged in close proximity, the metal wire shielding area (41) accounting for 1 / 7 to 1 / 9 of the shielding layer; A sheath (5) is arranged around the outer circumference of the shielding layer.

2. The lightweight coaxial line according to claim 1, characterized in that: The central conductor (1) comprises a plurality of guide wires which are intertwined with each other, and the material of the guide wires is one of silver-plated silver-copper alloy, silver-plated tin-copper alloy, silver-plated pure copper, tin-plated tin-copper alloy, and tin-plated pure copper.

3. The lightweight coaxial line according to claim 2, characterized in that: The central conductor (1) comprises 7 guide wires which are intertwined with each other, and the material of the guide wires is silver-plated silver-copper alloy.

4. The lightweight coaxial line according to claim 1, characterized in that: The thickness of the insulating layer (2) is between 0.04 mm and 0.5 mm; the insulating layer (2) is made of foamed PFA material or foamed FEP material.

5. The lightweight coaxial line according to claim 4, characterized in that: The thickness of the insulating layer (2) is 0.35 mm; the insulating layer (2) is made of foamed PFA material.

6. The lightweight coaxial line according to claim 1, characterized in that: The thickness of the metal foil shield (3) is between 0.0046 mm and 0.012 mm.

7. The lightweight coaxial line according to claim 6, characterized in that: The thickness of the metal foil shield (3) is 0.01 mm.

8. The lightweight coaxial line according to claim 1, characterized in that: The metal wire shielding area (41) occupies 1 / 8 of the shielding layer; the metal wire shielding area (41) covers the connection gap of the metal foil shielding (3).

9. The lightweight coaxial line according to claim 1, characterized in that: The thickness of the sheath (5) is between 0.005 mm and 0.1 mm; the material of the sheath (5) is one of polyester tape, PFA adhesive, or FEP adhesive.

10. A lightweight cable, characterized in that: The invention comprises the lightweight coaxial line as claimed in any one of claims 1 to 9, and a polyester wrapping tape layer arranged around a plurality of the lightweight coaxial lines, a shielding layer arranged around the outer circumference of the polyester wrapping tape layer, and an outer sheath arranged around the outer circumference of the shielding layer.

Images