Search

CN-224210373-U - Gas injection needle for physical foaming coaxial cable

CN224210373UCN 224210373 UCN224210373 UCN 224210373UCN-224210373-U

Abstract

The utility model discloses an air injection needle for a physical foaming coaxial cable, which comprises an air tap body, an air inlet needle body and an air inlet needle body, wherein the air tap body is provided with a cavity which extends axially, a first end of the cavity axially penetrates through the first end of the air tap body, a second end of the cavity axially penetrates through the second end of the air tap body through an air outlet hole, the air inlet needle body is arranged in the cavity, the outer side wall of the air inlet needle body is arranged in a clearance with the cavity wall of the cavity, and the first end of the air inlet needle body is rotatably connected with the first end of the air tap body so that the air inlet needle body can axially move in the cavity. Therefore, the air inlet needle body can be rotationally adjusted to a proper position and then fixed, so that the cavity space at the periphery of the air inlet needle body is fixed, the pressure change of the extruder screw and the charging barrel can not be changed, the temperature change can not be carried out, and the air outlet hole has constant and uniform air outlet quantity and has the characteristic of stable air injection. In addition, the gas injection needle has the advantages of simple structure, low manufacturing cost and convenient operation.

Inventors

  • CHEN WEILE
  • XIAO CUIYU
  • LIANG GUOCHAO

Assignees

  • 珠海宇讯创新科技有限公司

Dates

Publication Date
20260508
Application Date
20250529

Claims (10)

  1. 1. An air injection needle for a physically foamed coaxial cable, comprising: The air tap body is provided with an axially extending cavity, a first end of the cavity axially penetrates through the first end of the air tap body, and a second end of the cavity axially penetrates through the second end of the air tap body through an air outlet hole; The air inlet needle body is arranged in the cavity, the outer side wall of the air inlet needle body is in clearance arrangement with the cavity wall of the cavity, and the first end of the air inlet needle body is rotatably connected with the first end of the air tap body, so that the air inlet needle body can move axially in the cavity.
  2. 2. The gas injection needle for a physically foaming coaxial cable of claim 1, wherein the cavity comprises a connecting cavity and a gas cavity which are axially communicated, the connecting cavity axially penetrates through the first end of the gas nozzle main body, and the second end of the gas cavity is communicated with the gas outlet hole; The air inlet needle body comprises a connecting section and a main body section, wherein the connecting section is axially connected with the connecting cavity, the main body section is arranged in the air cavity, gaps are formed between the cavity wall of the connecting cavity and the outer side wall of the connecting section, between the cavity wall of the air cavity and the outer side wall of the main body section, and the connecting section is rotatably connected with the cavity wall of the connecting cavity so that the air inlet needle body can axially move in the cavity.
  3. 3. The gas injection needle for a physically foaming coaxial cable according to claim 2, wherein the outer side wall of the connecting section is in threaded connection with the cavity wall of the connecting cavity, so that the gas injection needle body can move axially in the cavity.
  4. 4. The gas injection needle for a physically foaming coaxial cable of claim 3, wherein the first end of the connecting section is provided with an auxiliary groove, and the auxiliary groove is used for an auxiliary tool to drive the connecting section to rotate relative to the connecting cavity so that the gas injection needle body can move axially in the cavity.
  5. 5. The gas injection needle for a physically foaming coaxial cable of claim 2, wherein the outer side wall of the connecting section is provided with an axially extending gas flow groove, so that a gap is arranged between the cavity wall of the connecting cavity and the outer side wall of the connecting section.
  6. 6. The gas injection needle for a physically foaming coaxial cable according to claim 5, wherein at least two gas flow grooves are provided, and at least two gas flow grooves are provided at equal intervals along the radial outer periphery of the connecting section.
  7. 7. The gas injection needle for a physically foamed coaxial cable of claim 2, wherein the inner diameter of the second end of the gas chamber tapers toward the gas outlet hole, and the minimum inner diameter of the gas chamber is greater than the aperture of the gas outlet hole, and the outer diameter of the second end of the body section tapers in equal proportion to the inner diameter of the second end of the gas chamber.
  8. 8. The gas injection needle for a physically foaming coaxial cable according to claim 2 or 7, wherein the second end of the main body section is connected with a needle section, the needle section is axially movably arranged at the gas outlet hole, and the outer side wall of the needle section is in clearance arrangement with the hole wall of the gas outlet hole.
  9. 9. The gas injection needle for a physically foaming coaxial cable according to claim 8, wherein a gap between an outer side wall of the needle body section and a wall of the gas outlet hole is 0.01-0.03mm.
  10. 10. The gas injection needle for a physically foaming coaxial cable according to claim 1, wherein the first end and the middle part of the gas nipple body are respectively provided with first external threads for connecting a gas cylinder and an extruder.

Description

Gas injection needle for physical foaming coaxial cable Technical Field The utility model relates to the technical field of foaming cable processing, in particular to an air injection needle for a physical foaming coaxial cable. Background As the demand for high speed transmission cables increases, physically foamed coaxial cables are popular because of their low attenuation characteristics. Along with the improvement of the requirements on cost reduction, energy conservation and environmental protection, the physical foaming coaxial cable is expected to play a larger role in environmental protection and energy conservation due to the light weight and high performance characteristics. In special occasions such as high-rise buildings, aerospace, medical appliances, nuclear power stations and the like, the physical foaming coaxial cable is increasingly adopted due to the fireproof and high-temperature resistance performance and the high transmission frequency requirement. The physical foaming coaxial cable mostly adopts a low-pressure physical foaming technology, gas is injected into an extruder, and mixed by a screw rod, so that cells are uniformly distributed in plastic, and a cable insulating layer with air holes is formed through an extrusion opening of a machine head, so that the attenuation of the coaxial cable is reduced by virtue of the lower dielectric constant of air, and the transmission performance is obviously improved compared with that of a chemical foaming technology. In the related art, a gas injection needle for injecting nitrogen adopts a structure of a spring and a piston which are matched, and the gas injection amount is controlled by the force of a non-return spring. But the spring is easy to be influenced by the temperature of the extruder, and the spring force can be changed when the internal pressure of the screw and the charging barrel is changed, so that the air inflow is unstable, the cable diameter and the foaming degree are unstable, and the impedance, attenuation and echo electrical performance of the physical foaming coaxial cable are influenced. In addition, the gas injection needle has more parts, complex structure and high manufacturing cost, and an operator needs to frequently adjust the gas inflow according to the change of the gas pressure, so that the gas injection needle is inconvenient to use. Disclosure of utility model The utility model aims to disclose an air injection needle for a physical foaming coaxial cable, which has the characteristics of stable air injection, simple structure, low manufacturing cost and convenient operation. In order to achieve the above object, the present utility model discloses a gas injection needle for a physically foaming coaxial cable, comprising: The air tap body is provided with an axially extending cavity, a first end of the cavity axially penetrates through the first end of the air tap body, and a second end of the cavity axially penetrates through the second end of the air tap body through the air outlet; The air inlet needle body is arranged in the cavity, the outer side wall of the air inlet needle body is arranged in a gap with the cavity wall of the cavity, and the first end of the air inlet needle body is rotatably connected with the first end of the air tap main body, so that the air inlet needle body can move in the axial direction of the cavity. As an alternative embodiment, the cavity comprises a connecting cavity and an air cavity which are axially communicated, the connecting cavity axially penetrates through the first end of the air tap body, and the second end of the air cavity is communicated with the air outlet hole; The air inlet needle body comprises a connecting section and a main body section, wherein the connecting section is axially connected with the connecting chamber, the main body section is arranged in the air chamber, gaps are formed between the cavity wall of the connecting chamber and the outer side wall of the connecting section, and gaps are formed between the cavity wall of the air chamber and the outer side wall of the main body section, and the connecting section is rotatably connected with the cavity wall of the connecting chamber so that the air inlet needle body can axially move in the cavity. As an alternative embodiment, the outer side wall of the connecting section is screwed with the cavity wall of the connecting cavity, so that the air inlet needle body can move axially in the cavity. As an alternative embodiment, the first end of the connecting section is provided with an auxiliary groove, and the auxiliary groove is used for an auxiliary tool to drive the connecting section to rotate relative to the connecting cavity, so that the air inlet needle body can move axially in the cavity. As an alternative embodiment, the outer side wall of the connecting section is provided with an axially extending air flow groove, so that a gap is provided between the cavity wall of the connecting cavity a