Production mold core of pipe body with single spiral inner wall
By designing the production core of the inner wall single spiral pipe body, only one spiral structure is allowed to be formed in the spiral inner wall tube, which solves the problem of serious pressure drop when the spiral inner wall tube is transported from a long distance in the prior art, and achieves the effect of reducing flow resistance and pressure drop.
Patent Information
- Application Number
- CN202422143249.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing spiral inner wall tube has severe pressure drop when transporting liquids from a long distance, and a single helical structure of spiral inner wall tube is needed to reduce flow resistance and pressure drop.
A production die core with an inner wall single spiral pipe body is designed. At least two spiral grooves are arranged on the circumference of the die core. The spiral grooves are arranged equidistantly about the central axis of the die core. By setting a sealing part at the end of the part of the spiral groove, only one spiral structure is allowed to be formed, reducing flow resistance and pressure drop.
It is achieved to reduce flow resistance and pressure drop when transporting fluids from a long distance, avoid eccentric vibration caused by uneven force in the circumference of the die core, and improve the forming quality of the spiral inner wall tube.
Smart Images
Figure CN222972730U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of extrusion dies, in particular to a production die core for an inner wall single spiral tube body. Background Art
[0002] A spiral inner wall tube refers to a tube body with a spiral structure similar to a thread on the inner wall of the tube body, which is mainly used in specific industrial or engineering applications, and uses the spiral structure on the inner wall to optimize the flow of fluids, improve the mixing efficiency or reduce the flow resistance.
[0003] The spiral structure of the spiral inner wall tube is used to enhance fluid flow, mixing or reduce turbulence. However, when there are too many spiral structures, the spiral structure will increase the flow resistance of the fluid, so it may lead to an increase in the pressure drop of the system.
[0004] During the long-distance transportation of liquids, the pressure drop of the spiral inner wall tube is serious, and a spiral inner wall tube with a single spiral structure is needed. Summary of the Utility Model
[0005] In view of this, it is necessary to provide a production die core for an inner wall single spiral tube body to solve the problem of how to obtain a spiral inner wall tube with a single spiral structure.
[0006] The utility model provides a production die core for an inner wall single spiral tube body, including a die core. At least two spiral grooves for forming a spiral structure of the spiral inner wall tube are opened on the circumferential surface of the die core. At least two of the spiral grooves are arranged equidistantly around the central axis of the die core, and the spiral grooves extend along the axial direction of the die core. Both ends of one of the spiral grooves are open, and the other spiral grooves are open at one end relatively far from the extrusion end of the die core for the input of the melt. The other spiral grooves are provided with blocking parts at one end relatively close to the extrusion end of the die core to block the output of the melt and inhibit the formation of the spiral structure.
[0007] Further, a transition surface is arranged on the blocking part relative to the spiral groove, and the transition surface is relatively smooth.
[0008] Further, the blocking length of the blocking part is less than 1 / 20 of the length of the spiral groove.
[0009] Further, the cross-section of the spiral groove is semi-circular, rectangular, triangular or star-shaped.
[0010] Further, the spiral angle of the spiral groove is 3° - 7°, and the spiral direction of the spiral groove is left-handed.
[0011] Further, there are three spiral grooves, and the three spiral grooves are arranged equidistantly around the central axis of the die core, and blocking parts are provided at one end of two of the spiral grooves.
[0012] Further, an installation hole for connecting with an extruder is formed in the middle of the die core.
[0013] Further, a clamping groove is arranged on one side of the installation hole.
[0014] Further, a lifting hole for connecting with a lifting ring is arranged on the die core.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0016] A production die core for an inner-wall single spiral tube body of the present utility model is provided with a die core. At least two spiral grooves are formed on the circumferential surface of the die core. The spiral grooves can form a spiral structure on the spiral inner-wall tube during the extrusion process of the spiral inner-wall tube, optimize the fluid flow, improve the mixing efficiency or reduce the flow resistance. At least two spiral grooves are arranged equidistantly around the central axis of the die core, and the spiral grooves extend along the axial direction of the die core. The spiral grooves act together on the spiral inner wall to form a spiral structure. One end of one of the spiral grooves is open, and the melt can be filled into the spiral groove to form a complete spiral structure. The other spiral grooves are open at one end relatively far from the extrusion end of the die core, and the melt can enter under the action of the extrusion pressure. The other spiral grooves are provided with blocking parts at one end relatively close to the extrusion end of the die core. The blocking parts can hinder the output of the melt and inhibit the formation of the spiral structure, so that only one spiral structure is formed on the spiral inner-wall tube, reducing the flow resistance and pressure drop during long-distance fluid transportation. Compared with only opening one spiral groove to form one spiral structure, the melt is filled in different spiral grooves, so that the melt is evenly distributed in the cross section, which can avoid uneven force on the die core in the circumferential direction, generate eccentric vibration and interfere with the forming quality of the spiral inner-wall tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:
[0018] Figure 1 is the schematic structural diagram of the whole of the present utility model Figure 1 ;
[0019] Figure 2 is the schematic structural diagram of the whole of the present utility model Figure 2 ;
[0020] Figure 3 is the schematic structural diagram of the whole of the present utility model Figure 3 ;
[0021] Figure 4 is Figure 2 the schematic enlarged partial structural diagram at A of
[0022] Figure 5 It is the bottom view of the whole of the present utility model;
[0023] Figure 6 It is the top view of the whole of the present utility model.
[0024] In the figure, 100 is the die core; 110 is the spiral groove; 120 is the plugging part; 121 is the transition surface; 130 is the mounting hole; 140 is the clamping groove; 150 is the lifting hole. Specific embodiments
[0025] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, and are not used to limit the scope of the present utility model.
[0026] A production die core 100 of an inner wall single spiral tube body in this embodiment relates to the technical field of extrusion molds. The redundant spiral grooves 110 on the die core 100 are plugged, and only one spiral groove 110 is retained, so that only one spiral structure is generated in the spiral inner wall tube, reducing the flow resistance and pressure drop during long-distance fluid transportation.
[0027] Please refer to Figures 1 to 6 , a production die core 100 of an inner wall single spiral tube body in this embodiment includes a die core 100. At least two spiral grooves 110 are formed on the circumferential surface of the die core 100. The spiral grooves 110 can form a spiral structure on the spiral inner wall tube during the extrusion process of the spiral inner wall tube, optimizing the fluid flow, improving the mixing efficiency or reducing the flow resistance. At least two spiral grooves 110 are arranged equidistantly around the central axis of the die core 100, and the spiral grooves 110 extend along the axial direction of the die core 100. The spiral grooves 110 act together on the spiral inner wall to form a spiral structure. One end of one of the spiral grooves 110 is open, and the melt can be filled into the spiral groove 110 to form a complete spiral structure. The other spiral grooves 110 are open at one end relatively far from the extrusion end of the die core 100, and the melt can enter under the action of the extrusion pressure. The other spiral grooves 110 are provided with a plugging part 120 at one end relatively close to the extrusion end of the die core 100. The plugging part 120 can hinder the output of the melt and inhibit the formation of the spiral structure, so that only one spiral structure is formed on the spiral inner wall tube, reducing the flow resistance and pressure drop during long-distance fluid transportation. Compared with only opening one spiral groove 110 to form one spiral structure, the melts are filled in different spiral grooves 110, so that the melts are evenly distributed in the cross section, which can avoid uneven force on the die core 100 in the circumferential direction, generating eccentric vibration and interfering with the forming quality of the spiral inner wall tube.
[0028] In some embodiments, please refer to Figures 1 to 4, a transition surface 121 is provided on the plugging portion 120 opposite to the spiral groove 110. An annular extrusion cavity is formed between the outer mold and the mold core 100, and the molten material is filled in the extrusion cavity. The plugging portion 120 is arranged at the end of the spiral groove 110. The molten material in the spiral groove 110 is blocked and extruded by the plugging portion 120, and will flow through the transition surface 121 and converge into the annular extrusion cavity. The transition surface 121 is relatively smooth, ensuring that the molten material can naturally transition when flowing through the plugging portion 120, avoiding uneven flow characteristics caused by overly sharp shape changes of the fluid, and preventing flow obstacles or dead corners.
[0029] It should be noted that the plugging portion 120 is integrally connected to the mold core 100 as a part of the mold core 100 and maintains a stable connection with the mold core 100.
[0030] In some embodiments, please refer to Figure 3 , the plugging length of the plugging portion 120 is less than 1 / 20 of the length of the spiral groove 110. The difference in the amount of molten material filled in the spiral groove 110 with the plugging portion 120 and the spiral groove 110 without the plugging portion 120 does not exceed 5%. The forces exerted by the molten material on the mold core 100 are approximately the same, which can inhibit the generation of eccentric vibration and ensure the forming quality of the spiral inner wall pipe.
[0031] The shorter plugging length can minimize the flow resistance and pressure drop to the greatest extent. The molten material can flow smoothly through the plugging area without forming excessive flow resistance at the plugging portion 120.
[0032] In some embodiments, the cross-section of the spiral groove 110 is semi-circular, rectangular, triangular or star-shaped.
[0033] As one implementation manner, when the cross-section of the spiral groove 110 is semi-circular, a semi-circular spiral rib can be formed inside the spiral inner wall pipe. The spiral rib can make the fluid flow smoother, reduce the flow resistance and the generation of turbulence, and is suitable for applications where the pressure drop needs to be reduced.
[0034] As one implementation manner, when the cross-section of the spiral groove 110 is rectangular, a rectangular spiral rib can be formed inside the spiral inner wall pipe. The spiral rib may provide a larger contact surface area, enhance the mixing effect of the fluid, and help improve the efficiency in industrial applications where enhanced mixing or reaction is required.
[0035] As one implementation manner, when the cross-section of the spiral groove 110 is triangular, a triangular spiral rib can be formed inside the spiral inner wall pipe. The spiral rib can generate a relatively high shear force, which is very effective for occasions where enhanced fluid shear action is required (such as stirring, reaction). At the same time, the sharp edges of the spiral rib can also enhance the perturbation of the fluid.
[0036] As one of the implementation manners, when the cross-section of the spiral groove 110 is star-shaped, a spiral rib with a star-shaped cross-section can be formed inside the spiral inner wall pipe. The spiral rib can maximize the contact area between the fluid and the pipe wall, thereby significantly enhancing the mixing effect and the disturbance effect, and is applicable to applications with very high requirements for fluid dispersion and mixing.
[0037] In some embodiments, refer to Figure 3 , the spiral angle of the spiral groove 110 is 3°-7°. When the spiral angle is less than 3°, the formed spiral structure weakens the disturbance effect on the fluid, and the flow of the fluid in the pipeline approaches linear flow. When the spiral angle is greater than 7°, the formed spiral structure will cause the fluid to flow along a longer spiral path when flowing in the pipeline, significantly increasing the flow resistance. The frictional force between the fluid and the pipe wall will also increase, resulting in a significant increase in the pressure drop within the system. This is particularly obvious in long-distance transmission systems because a larger angle will cause the pressure drop to rapidly accumulate with the increase in distance.
[0038] Only when the spiral angle of the spiral groove 110 is 3°-7°, the formed spiral structure can make the fluid flow more smoothly along the axial direction of the pipeline, reducing the flow resistance and the pressure drop. The spiral angle of 3°-7° can provide an appropriate spiral effect, which can not only enhance the disturbance and mixing effect of the fluid, but also not significantly increase the flow resistance. This angle range can enhance the interaction between the fluid and the pipe wall while avoiding excessive fluid resistance, so it helps to reduce the pressure drop and energy consumption in long-distance transportation systems. When the spiral angle is within this range, the spiral angle can make the fluid flow more smoothly, reducing vortex and recirculation phenomena, thereby reducing the overall pressure drop of the system.
[0039] In the specific implementation process, the spiral angle of the spiral groove 110 is 5°. As a balance point within the range of 3°-7° of the spiral angle, it can effectively promote the mixing of the fluid, ensure the uniform distribution of the fluid in the pipeline, and not significantly slow down the transmission speed of the fluid.
[0040] In some embodiments, the spiral direction of the spiral groove 110 is left-handed. The left-handed spiral groove 110 structure can provide control of the fluid movement in a specific direction. Especially when used in conjunction with other system components (such as pumps or valves), it can optimize the fluid mechanics performance of the entire system. The left-handed spiral can also be used to avoid interference with right-handed components (such as pumps or rotating equipment), thereby reducing the flow instability within the system.
[0041] In some embodiments, refer to Figure 1 and Figure 6, there are three spiral grooves 110, and the three spiral grooves 110 are arranged equidistantly around the central axis of the die core 100. One end of one of the spiral grooves 110 is provided with a blocking portion 120. The equidistant arrangement of the three spiral grooves 110 can ensure uniform force in the circumferential direction of the die core 100, balance the forces of each spiral groove 110, make the force on the die core 100 more uniform during the forming process, and reduce the eccentric vibration caused by uneven force. Reducing the eccentric vibration helps to improve the quality of the finished spiral inner wall pipe and avoid dimensional errors or surface defects caused by vibration.
[0042] In the specific implementation process, the setting of the blocking portion 120 can prevent the spiral groove 110 from forming a complete spiral structure at one end. By setting the blocking portion 120, the flow path of the melt during the forming process can be effectively controlled, so that only one spiral groove 110 forms a complete spiral structure. The other two spiral grooves 110 cannot be completely formed due to the existence of the blocking portion 120 and can only form two relatively shallow scratches.
[0043] In some embodiments, please refer to Figure 6 , a mounting hole 130 for connecting with an extruder is opened in the middle of the die core 100. The mounting hole 130 can cooperate with the outer die to fix the die core 100 as a whole inside the outer die to form an extrusion cavity. As a further implementation method, a clamping groove 140 is provided on one side of the mounting hole 130. The clamping groove 140 can further cooperate with the extruder to provide auxiliary support and prevent the die core 100 from rotating relative to the outer die, interfering with the formation of the spiral inner wall pipe.
[0044] In some embodiments, please refer to Figure 6 , a lifting hole 150 is provided on the die core 100. The lifting hole 150 is a threaded hole, and the threaded hole can be threadedly connected with a lifting ring, which is convenient for moving and installing the die core 100 by using a crane.
[0045] Working process: Install the die core 100 in the extruder, and the die core 100 and the outer die form an extrusion cavity. When the melt is extruded from the extruder, the melt moves along at least two spiral grooves 110 and the extrusion cavity, so that the die core 100 is uniformly stressed. Only the melt in one spiral groove 110 can flow out along the spiral groove 110 to form a spiral structure on the spiral inner wall pipe. The melt in the other spiral grooves 110 is blocked by the blocking portion 120 and reflows into the extrusion cavity, so that there is only one spiral structure inside the spiral inner wall pipe, thus ensuring that the pressure drop during long-distance fluid transportation remains at a low level.
[0046] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the present invention.
Claims
1. A production mold core for a single-helical tube body on the inner wall, characterized in that: It comprises a mold core, on the circumferential surface of which at least two spiral grooves are provided for forming a spiral structure with a spiral inner wall tube, at least two of the spiral grooves are equidistantly arranged around the central axis of the mold core, and the spiral grooves are extended along the axial direction of the mold core; both ends of one of the spiral grooves are open, and the other spiral grooves are open at one end relatively far from the extrusion end of the mold core for the input of molten material; the other spiral grooves are provided with a blocking portion at one end relatively close to the extrusion end of the mold core for obstructing the output of the molten material and inhibiting the formation of the spiral structure.
2. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: The blocking portion is provided with a transition surface relative to the spiral groove, and the transition surface is relatively smoothly arranged.
3. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: The blocking length of the blocking portion is less than 20 / 1 of the length of the spiral groove.
4. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: The cross section of the spiral groove is semicircular, rectangular, triangular or star-shaped.
5. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: The helix angle of the spiral groove is 3°-7°, and the hand direction of the spiral groove is left-handed.
6. A production mold core for an inner wall single spiral tube according to any one of claims 1 to 5, characterized in that: There are three spiral grooves, which are arranged equidistantly around the central axis of the mold core, and one end of two of the spiral grooves is provided with a blocking portion.
7. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: A mounting hole for connecting with an extruder is provided in the middle of the mold core.
8. The production mold core of the inner wall single spiral tube body according to claim 7, characterized in that: A clamping groove is provided on one side of the mounting hole.
9. The production mold core of the inner wall single spiral tube body according to claim 1, characterized in that: The mold core is provided with a lifting hole for connecting with a lifting ring.