A physical foaming gas injection needle

Abstract

The present application relates to the technical field of foamed cable processing, and in particular to a physical foaming gas injection needle, including a gas injection needle body, a filter and a flow mold, the gas injection needle body including an air inlet end, a filter seat and an injection needle segment, an air inlet channel is arranged in the air inlet end, a filter channel is arranged in the filter seat, and an injection channel is arranged in the injection needle segment; the filter channel is connected between the air inlet channel and the injection channel; the filter is arranged in the filter seat, located between the filter channel and the air inlet channel, the filter includes a particle filter and a pressure ring, and the pressure ring is located on the side of the particle filter close to the air inlet end; the flow mold is located between the filter channel and the injection channel, and a flow hole is provided on the flow mold, and the flow mold is made of ruby ​​material. The present application can improve the production quality of physical foamed insulation core wire.

Description

Technical Field

[0001] The present application relates to the technical field of foamed cable processing, and in particular to a physical foaming gas injection needle. Background Art

[0002] As the demand for high-speed transmission cables increases, physically foamed insulated core wires are becoming more popular due to their low attenuation properties.

[0003] With the increasing requirements for cost reduction, energy conservation and environmental protection, physical foam insulation core wires are expected to play a greater role in environmental protection and energy conservation due to their light weight and high performance. In special occasions such as high-rise buildings or aerospace, medical equipment, nuclear power plants, etc., physical foam insulation core wires are increasingly being used due to their fireproof and high temperature resistance, as well as high transmission frequency requirements.

[0004] Related art discloses an ultra-high pressure nitrogen injection needle for high-speed foaming cables, comprising: a quick connector and a needle body with a hollow arrangement, a downwardly recessed receiving groove at the first end of the needle body, a gas metering mold body provided in the receiving groove, a placement hole provided at the center of the gas metering mold body, a pinhole body made of diamond-grade or sapphire-grade material inlaid in the placement hole, and a metering hole provided on the pinhole body. A first high-temperature resistant sealing rubber ring is provided on the top of the gas metering mold body, and a filter screen is provided on the top of the first high-temperature resistant sealing rubber ring, and the filter screen can filter out fine impurities in the nitrogen to prevent the metering hole on the pinhole body from being blocked. However, the filtering effect of the filter screen is limited. After long-term use, too many impurities accumulate on the filter screen, affecting the ventilation effect, and a new injection needle needs to be replaced. The service life of the injection needle is short. Summary of the invention

[0005] In order to increase the service life of the gas injection needle, a physical foaming gas injection needle is provided.

[0006] The present application provides a physical foaming gas injection needle, which adopts the following technical solution:

[0007] A physical foaming gas injection needle, comprising:

[0008] The gas injection needle body comprises an air inlet end, a filter seat and an injection needle segment, wherein the air inlet end is provided with an air inlet channel, the filter seat is provided with a filter channel, and the injection needle segment is provided with an injection channel; the filter channel is connected between the air inlet channel and the injection channel;

[0009] A filter is arranged in the filter seat and located between the filter channel and the air intake channel, the filter comprises a particle filter and a pressure ring, and the pressure ring is located on a side of the particle filter close to the air intake end;

[0010] The flow mold is located between the filtering channel and the injection channel. A flow hole is provided on the flow mold. The flow mold is made of ruby ​​material.

[0011] By adopting the above technical solution, the pressure ring presses the particle filter between the filter channel and the air inlet channel to achieve stable installation of the particle filter in the filter seat; the particle filter in the filter can effectively remove impurities in the incoming gas, ensure gas purity, avoid clogging the flow mold and the injection channel, thereby stabilizing the bubble formation process and ensuring the density uniformity and mechanical properties of the physical foaming insulation core wire. The flow mold is made of ruby ​​material and has flow holes on it, which can fix a constant gas injection flow, further improve the foaming degree and the quality of the foam structure, and ensure the stable performance of the physical foaming insulation core wire.

[0012] Optionally, an injection hole is formed at one end of the injection channel away from the filter seat, and the diameter of the injection hole is 0.02 mm.

[0013] By adopting the above technical solution, the end of the injection channel away from the filter seat gradually shrinks in the direction away from the filter seat to form a injection hole. The aperture of the injection hole is 0.02mm, which can effectively increase the gas injection speed and spray out extremely fine atomized gas, so that the material solution and the chemical mixture are highly fused under the ultra-high pressure atomization state, and the bubbles are small and evenly distributed, so that the tensile and compressive mechanical strengths of the physical foaming insulation core wire can meet the standards.

[0014] Optionally, the particulate filter is made of aluminum alloy.

[0015] By adopting the above technical solution, aluminum alloy material is selected to make the particle filter. The aluminum alloy material has good corrosion resistance and is particularly suitable for contact with different types of gases and chemicals. It can extend the service life of the filter and reduce maintenance frequency and cost.

[0016] Optionally, a heating chamber is further provided in the filter seat, and the heating chamber is sleeved outside the filter channel;

[0017] The heating chamber comprises a heating inlet and a heating outlet, and both the heating inlet and the heating outlet are communicated with the outside.

[0018] By adopting the above technical scheme, after the foaming and gas injection is completed, carbon dioxide continues to be injected through the gas injection needle body, and a large amount of heat is absorbed when the carbon dioxide releases the pressure, thereby accelerating the internal cooling of the physically foamed insulation core wire; since the temperature of the gas injection needle body is relatively low during the foaming process, during the process of carbon dioxide injection, high-temperature heat exchange liquid is contained in the heating chamber. When the carbon dioxide passes through the filter channel, the heat exchange liquid in the heating chamber heats the carbon dioxide, thereby preventing the carbon dioxide from frosting and freezing in the filter channel, causing the filter channel to be blocked.

[0019] Optionally, a dust suction channel is further provided in the filter seat, one end of the dust suction channel is connected to the pressure ring, and the other end is connected to the outside world, and the end of the dust suction channel connected to the outside world can be opened and closed;

[0020] The injection needle segment is provided with a partition member, and the partition member is used to control the connection and disconnection between the filtering channel and the injection channel.

[0021] By adopting the above technical solution, the dust suction channel can effectively remove impurities generated during the filtration process and keep the filtration environment clean, thereby ensuring the purity of the foaming gas and avoiding the unstable bubble formation caused by impurities, thereby improving the density uniformity and mechanical properties of the physical foaming insulation core wire. The design of the partition allows the connection between the filter channel and the injection channel to be cut off when the dust suction channel is used for dust suction, which is convenient for maintaining and cleaning the filter. At the same time, it can also be quickly isolated in the event of a fault to prevent the spread of pollution and ensure the continuity and stability of the production process.

[0022] Optionally, the partition member includes a partition ball and a control rod connected to the partition ball, and a moving groove for the partition ball to slide is provided on the inner side wall of the injection channel;

[0023] One end of the control rod is located in the moving groove, and the other end passes through the moving groove and is threadedly connected to the inner side wall of the moving groove.

[0024] By adopting the above technical solution, the design of the partition ball and the control rod allows the operator to adjust the position of the partition ball by rotating the control rod to achieve the on-off control of the filter channel and the injection channel. The moving groove on the inner wall of the injection channel provides a guide for the sliding of the partition ball, ensuring the stability of the partition ball during movement; the threaded connection design between the control rod and the inner wall of the moving groove not only facilitates the adjustment of the partition ball position, but also enhances the reliability of the entire system and prevents the displacement of the partition ball caused by external vibration and other factors.

[0025] Optionally, the partition ball is made of elastic material.

[0026] By adopting the above technical solution, the partition ball uses elastic materials that can effectively adapt to pressure changes in different working environments, ensuring sealing and stability. The elastic material can better fit the moving groove, prevent gas leakage, and ensure the normal operation of the gas injection needle.

[0027] In summary, the present application includes at least one of the following beneficial effects:

[0028] 1. A filter is provided in the present application, and the particle filter in the filter can effectively filter out impurities, ensure the purity of the gas entering the injection channel, improve the stability and uniformity of the pore formation, and thus improve the density distribution and mechanical properties of the physically foamed insulation core wire;

[0029] 2. The flow mold in this application is made of ruby ​​material, which has high wear resistance and corrosion resistance, can maintain the size stability of the flow hole for a long time, so as to maintain a constant injection flow, reduce the foaming degree and foam structure quality problems caused by the change of the hole diameter, and ensure the production quality of the physical foaming insulation core wire;

[0030] 3. The aperture of the injection hole in this application is 0.02mm, so that the gas injection needle body can spray out atomized gas, and the gas injection velocity is supersonic, so that the material melt and the chemical mixture are highly fused under the ultra-high pressure atomization state, and the bubbles formed by foaming are small and evenly distributed, and the tensile and compressive mechanical strength of the generated physical foamed insulation core wire can meet the standard requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the physical foaming gas injection needle in Example 1 of the present application;

[0032] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0033] Figure 3 yes Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0034] Figure 4 yes Figure 1 A schematic diagram of the local enlarged structure at C in the middle;

[0035] Figure 5 This is a schematic diagram of the structure of the physical foaming gas injection needle in Example 2 of the present application;

[0036] Figure 6 It is a partial structural diagram of Example 2 of the present application;

[0037] Explanation of the accompanying drawings: 1. Injection needle body; 11. Air inlet end; 111. Air inlet channel; 12. Filter seat; 121. Filter channel; 122. Heating chamber; 123. Receiving groove; 124. Dust suction channel; 13. Injection needle section; 131. Injection channel; 1311. Injection hole; 132. Mounting groove; 133. Moving groove; 14. Inlet interface; 15. Outlet interface; 2. Filter; 21. Particle filter; 22. Pressing ring; 3. Flow mold; 31. Flow hole; 4. Partition piece; 41. Partition ball; 42. Control rod; 5. Sealing head. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-6 This application is described in further detail.

[0039] Embodiment 1,

[0040] The embodiment of the present application provides a physical foaming gas injection needle, comprising a gas injection needle body 1, a filter 2 and a flow mold 3. Figure 1 , wherein the gas injection needle body 1 includes an air inlet end 11, a filter seat 12 and an injection needle segment 13, an air inlet channel 111 is formed in the air inlet end 11, a filter channel 121 is formed in the filter seat 12, and an injection channel 131 is formed in the injection needle segment 13; an air inlet channel 111 is provided inside the air inlet end 11 for introducing high-pressure gas. A filter channel 121 is provided inside the filter seat 12 for filtering the incoming gas. An injection channel 131 is provided inside the injection needle segment 13 for injecting the filtered gas into the foaming material. The filter seat 12 is located between the air inlet end 11 and the injection needle segment 13, so that the air inlet channel 111, the filter channel 121 and the injection channel 131 are connected in sequence to form a complete gas flow path. The air injection needle body 1 is required to withstand a pressure of 1000 bar, and at a pressure of 300 bar, the flow rate is 5-30L / H (depending on the foaming requirements), and the gas injection speed exceeds 343m / s.

[0041] Reference Figure 1 and Figure 2 The filter seat 12 has a receiving groove 123 at one end close to the air inlet end 11, and one end of the air inlet end 11 is threadedly connected to the receiving groove 123, so that the air inlet channel 111 is connected to the filter channel 121. The air inlet channel 111 is far away from the filter seat 12, and the area surrounded by the inner side wall of the air inlet channel 111 gradually increases in the direction away from the filter seat 12, showing a flared shape.

[0042] Reference Figure 2 , the filter 2 is clamped in the receiving groove 123 and is located between the filter channel 121 and the air intake channel 111; the filter 2 includes a particle filter 21 and a pressure ring 22, and the pressure ring 22 is located on the side of the particle filter 21 close to the air intake terminal 11, and is used to press the particle filter 21 to prevent the particle filter 21 from being displaced under the action of high-pressure gas. The particle filter 21 can filter out impurities in the gas to ensure the purity of the gas. The particle filter 21 can be made of aluminum alloy material with micropores or ceramic filter to improve the filtering efficiency. The pressure ring 22 can be made of aluminum alloy material, which has good corrosion resistance and mechanical strength. In this embodiment, the pressure ring 22 is a rotating body, and the axis of the inner hole of the pressure ring 22 is colinear with the axis of the air intake channel 111 and the filter channel 121.

[0043] Reference Figure 1 and Figure 3 , an installation groove 132 is provided at one end of the injection needle segment 13 close to the filter seat 12, and one end of the filter seat 12 is penetrated and threadedly connected in the installation groove 132. The flow mold 3 is located between the filter channel 121 and the injection channel 131, and a flow hole 31 is provided on the flow mold 3. The aperture range of the flow hole 31 is: 0.003-0.015mm, and the specific aperture of the flow hole 31 can be selected according to actual needs to control the flow rate of the gas. The flow mold 3 is made of ruby, which has extremely high hardness and wear resistance. It is not easy to wear when passing high-speed gas, and the aperture of the flow hole 31 does not change when the temperature difference changes greatly. Figure 3 and Figure 4 In this embodiment, the flow mold 3 is a body of revolution, and the axis of the flow hole 31 is arranged in a colinear relationship with the axis of the filter channel 121 and the injection channel 131. The end of the injection channel 131 away from the filter seat 12 gradually shrinks in a direction away from the filter seat 12 to form an injection hole 1311. The aperture of the injection hole 1311 is 0.02 mm. A smaller aperture can increase the pressure of the gas, making the gas more concentrated during the injection process, which is conducive to forming small and uniform bubbles.

[0044] The thermal expansion coefficient of the gas injection needle body 1 is 1.2×10 -6 -5.4×10 -6 K -1 The material with a low thermal expansion coefficient can maintain a stable size within a large temperature difference range. The gas injection needle body 1 can maintain stable performance in high and low temperature environments, thereby reducing the aperture change caused by temperature changes and improving the stability and reliability of the gas injection needle.

[0045] The implementation principle of a physical foaming gas injection needle in this embodiment 1 is as follows: the gas injection needle body 1 is installed in the middle of the foaming extruder, and the high-pressure gas is introduced into the gas injection needle body 1. After passing through the air inlet channel 111 and the filter channel 121 in turn, it is ejected along the injection channel 131 to inject the high-pressure gas into the plasticized plastic melt in the extruder. By setting the filter 2 and the flow mold 3, the problems of insufficient gas purity and pore size change during the gas injection process are effectively solved. The particle filter 21 in the filter 2 can efficiently filter out impurities in the gas, ensure the purity of the gas, and thus improve the stability of bubble formation. The flow hole 31 on the flow mold 3 can accurately control the gas flow rate to avoid uneven bubbles caused by flow fluctuations. The end of the injection channel 131 of the injection needle section 13 can effectively improve the concentration and pressure of the gas injection by designing a tapered injection hole, so that the gas forms small and uniform bubbles in the foaming material. Small and uniform bubbles can not only improve the mechanical properties of the physical foaming insulation core wire, but also reduce its density and improve the transmission performance. These improvement measures have significantly improved the production quality of physically foamed insulated core wires and increased the market competitiveness of the products.

[0046] Embodiment 2,

[0047] According to Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that a heating chamber 122 is further provided in the filter seat 12, and the heating chamber 122 is arranged in an annular shape and sleeved outside the filter channel 121. The heating chamber 122 includes a heating inlet and a heating outlet, and the heating inlet is connected to an inlet interface 14, and the heating outlet is connected to a discharge interface 15, and the inlet interface 14 and the discharge interface 15 are both fixed on the outer wall of the filter seat 12. The heat exchange liquid can be introduced into the heating chamber 122 through the inlet interface 14, and the heat exchange liquid after absorbing heat can be discharged through the discharge interface 15.

[0048] When producing large-sized physical foam insulation core wires, the outer diameter of the physical foam insulation core wire is large, and it is not easy to cool the inside, resulting in different sizes of bubbles, making the capacitance of the finished product uneven. Therefore, when making large-sized physical foam insulation core wires; carbon dioxide gas can be injected into the unformed physical foam insulation core wire through the gas injection needle body 1, and the carbon dioxide absorbs a large amount of heat when releasing the pressure, so that the inside of the physical foam insulation core wire is cooled. Because the temperature of the gas injection needle body 1 is low during the foaming process, during the process of carbon dioxide injection, high-temperature heat exchange liquid is filled in the heating chamber 122. When carbon dioxide passes through the filter channel 121, the heat exchange liquid in the heating chamber 122 heats up the carbon dioxide, preventing carbon dioxide from frosting and freezing in the filter channel 121, causing the filter channel 121 to be blocked. This allows the gas to flow smoothly in the filter channel 121.

[0049] Reference Figure 6 A dust suction channel 124 is provided on the inner wall of the receiving groove 123. One end of the dust suction channel 124 extends into the pressure ring 22 and is connected to the inner hole of the pressure ring 22. The other end of the dust suction channel 124 extends out of the filter seat 12 and is connected to the outside world. A plugging head 5 is threadedly connected to one end of the dust suction channel 124 that is connected to the outside world. The plugging head 5 can control the connection and disconnection between the dust suction channel 124 and the outside world. A partition 4 is also provided on the filter seat 12, and the partition 4 is used to control the connection and disconnection between the filter channel 121 and the injection channel 131.

[0050] Reference Figure 6The injection needle section 13 is also provided with a partition member 4, which includes a partition ball 41 and a control rod 42 fixedly connected to the partition ball 41. A movable groove 133 for sliding the partition ball 41 is provided on the inner wall of the injection channel 131. One end of the control rod 42 is located in the movable groove 133, and the other end passes through the movable groove 133 and is threadedly connected to the inner wall of the movable groove 133. By rotating the control rod 42, the partition ball 41 can be driven to slide into or out of the movable groove 133 to control the connection between the filter channel 121 and the injection channel 131. The partition ball 41 is made of elastic material, and the diameter of the partition ball 41 is greater than or equal to the inner diameter of the filter channel 121, which can better control the connection between the filter channel 121 and the injection channel 131.

[0051] By providing the dust suction channel 124 and the partition 4, the cleanliness of the filter 2 and the safety of the gas injection needle can be effectively improved. The dust and impurities accumulated in the filter 2 can be discharged in time through the dust suction channel 124 to keep the filter 2 clean, thereby improving the purity of the gas and the service life of the filter 2. Before the dust suction process is performed through the dust suction channel 124, the top of the air inlet end 11 needs to be closed first, and the connection between the filter channel 121 and the injection channel 131 needs to be disconnected by using the partition 4 to prevent foreign impurities from being sucked into the gas injection needle body 1 during the dust removal process.

[0052] The other structures and beneficial effects are the same as those of the first embodiment and will not be described in detail here.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A physical foaming gas injection needle, characterized in that: include: The gas injection needle body (1) comprises an air inlet end (11), a filter seat (12) and an injection needle segment (13); the air inlet end (11) is provided with an air inlet channel (111), the filter seat (12) is provided with a filter channel (121), and the injection needle segment (13) is provided with an injection channel (131); the filter channel (121) is connected between the air inlet channel (111) and the injection channel (131); A filter (2) is arranged in the filter seat (12) and is located between the filter channel (121) and the air intake channel (111); the filter (2) comprises a particle filter sheet (21) and a pressure ring (22); the pressure ring (22) is located on a side of the particle filter sheet (21) close to the air intake end (11); A flow mold (3) is located between the filtering channel (121) and the injection channel (131), a flow hole (31) is provided on the flow mold (3), and the flow mold (3) is made of ruby ​​material; A dust suction channel (124) is also provided in the filter seat (12), one end of the dust suction channel (124) is connected to the pressure ring (22), and the other end is connected to the outside, and the end of the dust suction channel (124) connected to the outside can be opened and closed; The injection needle segment (13) is provided with a partition (4), and the partition (4) is used to control the connection between the filtering channel (121) and the injection channel (131); The partition member (4) comprises a partition ball (41) and a control rod (42) connected to the partition ball (41); the inner side wall of the injection channel (131) is provided with a moving groove (133) for the partition ball (41) to slide; One end of the control rod (42) is located in the movable groove (133), and the other end passes through the movable groove (133) and is threadedly connected to the inner wall of the movable groove (133).

2. A physical foaming gas injection needle according to claim 1, characterized in that: An injection hole (1311) is formed at one end of the injection channel (131) away from the filter seat (12); the diameter of the injection hole (1311) is 0.02 mm.

3. A physical foaming gas injection needle according to claim 2, characterized in that: The particle filter (21) is made of aluminum alloy material.

4. The physical foaming gas injection needle according to claim 1, characterized in that: A heating chamber (122) is further provided in the filter seat (12), and the heating chamber (122) is sleeved outside the filter channel (121); The heating chamber (122) comprises a heating inlet and a heating outlet, and both the heating inlet and the heating outlet are connected to the outside.

5. The physical foaming gas injection needle according to claim 1, characterized in that: The partition ball (41) is made of elastic material.

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