An anti-condensation hot runner injection mold

Abstract

The present invention discloses an anti-condensation hot runner injection mold, comprising a swirl tube, a heating ring seat and a flow-aiding tube. A swirl channel and a filling port are provided inside the swirl tube, and the liquid flow is guided by a rotating moving guide bucket to ensure that the molten plastic is evenly heated during the flow process and to prevent the occurrence of condensation. A heating coil is provided in the heating ring seat, and the temperature is controlled by a constant temperature control module to ensure the temperature stability of the hot runner. The flow-aiding tube further heats the liquid flow through a plurality of axially arranged electric heating rings, thereby improving the temperature uniformity of the liquid flow and avoiding local condensation. By adopting a precise temperature control system, innovative flow control technology and hot runner design, the structural design of the swirl channel and the moving guide bucket of the present invention increases the flow efficiency of the liquid flow, and through the diversion and confluence mechanism of the Tesla valve structure, the flow performance of the liquid flow is improved, the molding efficiency is effectively improved, the waste is reduced, and the energy consumption in the injection molding process is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, in particular to an anti-condensation hot runner injection mold. Background Art

[0002] Injection molding, a widely used processing technology in modern industry, plays a crucial role in the production of plastic products. The injection molding process involves injecting molten plastic into a mold and cooling it to form the desired plastic product. With technological advancements, an increasing number of high-precision, high-complexity plastic parts are being used in various fields, such as electronics, automobiles, and medical devices. To meet these demands, injection molding technology is constantly being optimized and improved. The application of hot runner technology, particularly in complex molds, has become a key tool for improving production efficiency and product quality.

[0003] However, traditional injection molds have certain limitations in hot runner design, which are mainly manifested in the following aspects:

[0004] Condensation: In traditional injection molds, poorly designed hot runner temperature control systems can lead to uneven temperature control during the plastic melt's flow within the mold, leading to condensation. This is particularly true during the cooling phase, where uneven cooling occurs between the mold surface and interior. This can cause the plastic melt to cool too low in some areas during its flow, causing the plastic to condense and fail to fill the entire mold cavity. This not only affects the integrity of the product but can also lead to surface defects such as bubbles, cracks, or roughness.

[0005] Uneven hot runner heating: Traditional mold hot runner heating systems typically use electric heating strips or tubes. While these systems can provide a certain degree of heating, they often suffer from uneven heating and low heating efficiency. These issues lead to large temperature differences at different locations in the melt, which in turn causes poor plastic flowability and incomplete filling during the filling process, ultimately affecting product quality.

[0006] Waste Generation and Resource Waste: Due to condensation caused by uneven temperatures, waste is unavoidable during many injection molding processes. This is especially true near the mold walls, where low temperatures cause plastic to condense, leading to increased waste. This waste not only increases production costs but also places an environmental burden. Furthermore, uneven mold heating wastes energy, further increasing production costs.

[0007] In view of this, research and improvement are carried out on the existing problems, and an anti-condensation hot runner injection mold is provided to solve the current problems. The purpose is to achieve the purpose of solving the problems and improving the practical value through this technology. Summary of the Invention

[0008] The present invention aims to solve one of the technical problems existing in the prior art or related art.

[0009] To this end, the technical solution adopted by the present invention is: an anti-condensation hot runner injection mold, comprising:

[0010] The swirl tube is the mold's primary component. A spiral-shaped swirl channel winds around its surface, guiding the liquid flow in the direction of rotation to prevent condensation. The inner wall of the swirl channel features a rounded, smooth surface design to reduce friction and improve flow efficiency.

[0011] Heating Ring: The heating ring is used to provide uniform heating for the liquid flow. It has a built-in heating coil and is precisely temperature-controlled by a thermostatic control module to ensure that the liquid flow maintains the appropriate temperature as it passes through the cyclone.

[0012] Dynamic guide bucket and its structure: The dynamic guide bucket is connected to the swirl cylinder via an extrusion shaft. Inside the dynamic guide bucket are a guide cone and swirl vanes. The guide cone helps guide the liquid flow, while the swirl vanes enhance mixing and heating of the liquid flow through rotation, preventing local condensation of the liquid flow.

[0013] Flow-aiding tube: The flow-aiding tube includes a guide tube, a partition plate, an electric heating ring and a conical core shaft. It heats the liquid flow through the electric heating ring and further improves the fluidity of the liquid flow through the structure of the conical core shaft to avoid condensation.

[0014] Diverter ring and confluence ring: The diverter ring and confluence ring set in the cyclone form a Tesla valve structure, which adjusts the flow direction of the liquid through the diverter channel and the confluence channel, improves the flow efficiency, and compensates for kinetic energy to reduce the occurrence of condensation problems.

[0015] Beneficial effects

[0016] The anti-condensation hot runner injection mold of the present invention effectively solves the condensation problem in traditional injection molds through the following technical innovations and has significant beneficial effects:

[0017] 1. Significant anti-condensation effect: The spiral design of the swirl tube and dynamic guide bucket, as well as the temperature control system of the heating ring, ensure that the flow temperature of the liquid in the mold is uniform, thus preventing condensation. The constant temperature control module in the heating ring ensures that the liquid temperature is always maintained within the appropriate range during the injection molding process, avoiding the condensation problem caused by temperature fluctuations in traditional molds.

[0018] 2. Improved injection molding quality: This invention ensures uniform flow of the plastic melt through a precise temperature control system and flow control device, reducing the occurrence of bubbles, cracks, and other defects during the injection molding process. As a result, molded products are of higher quality and have a smoother surface.

[0019] 3. Improved injection molding efficiency: The swirl channel and dynamic guide bucket design increase the flow efficiency of the liquid flow, and the Tesla valve structure's flow diversion and confluence mechanism improves the flow performance. This design not only improves flow efficiency, but also effectively reduces waste generation and improves overall production efficiency.

[0020] 4. Precise temperature control, energy saving and consumption reduction: This invention achieves efficient heating through the heating ring base and the electric heating ring in the flow-aiding tube. Combined with the constant temperature control module, precise temperature control avoids energy waste and uneven heating. The precision of the temperature control system greatly improves heating efficiency, saves energy and reduces consumption, and reduces production costs.

[0021] 5. High-temperature-resistant and anti-stick coating design: The inner surface of the swirl tube, dynamic guide bucket, and flow-aiding tube is coated with a high-temperature-resistant anti-stick coating, ensuring that the mold will not malfunction or clog due to adhesion of the plastic melt during long-term operation. In addition, the high-temperature resistance of the coating ensures stable operation of the mold at high temperatures, extending the mold life.

[0022] 6. Suitable for injection molding of various plastic materials: Due to the uniform heating and precise temperature control of the liquid flow, the anti-condensation hot runner injection mold of the present invention can meet the injection molding requirements of various plastic materials, and is particularly suitable for those injection molding products with strict requirements.

[0023] The present invention's condensation-resistant hot runner injection mold overcomes molding defects caused by condensation in traditional molds through precise hot runner design and innovative temperature and flow control technologies, thereby improving injection molding efficiency and product quality. Application of the present invention can significantly reduce waste generation, improve production efficiency, and provide significant economic and technical advantages. Therefore, this invention is of great significance to the development of the injection molding industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a cyclone tube and a heating ring seat according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of a cyclone according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of a cyclone tube and a heating ring seat according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a dynamic guide bucket and an extrusion shaft rod according to an embodiment of the present invention;

[0029] Figure 6This is a schematic diagram of the cross-sectional structure of the dynamic guide bucket and the extrusion shaft according to one embodiment of the present invention;

[0030] Figure 7 A schematic diagram of a partial cross-sectional structure of a heating ring seat according to an embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the cross-sectional structure of a flow-aiding tube according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 100, swirl tube; 110, swirl channel; 120, drive motor; 130, dynamic guide bucket; 140, extrusion shaft; 150, first diverter ring; 160, second diverter ring; 111, filling port; 131, guide cone; 132, swirl vane; 141, extrusion swirl vane; 151, diverter channel; 152, converging channel;

[0034] 200, heating ring seat; 210, control terminal box; 220, heating coil;

[0035] 300, flow-assisting tube; 310, flow guide tube; 320, partition plate; 330, electric heating ring; 340, conical core shaft; 311, outer flow channel; 312, inner flow channel;

[0036] 400. Mould body. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0038] It is to be understood that these descriptions are illustrative only and are not intended to limit the scope of the invention.

[0039] The following is combined with Figures 1-8 An anti-condensation hot runner injection mold provided by some embodiments of the present invention is described.

[0040] Example 1

[0041] As shown in the figure, in this embodiment, the anti-condensation hot runner injection mold consists of a swirl tube 100, a heating ring seat 200, and a flow-enhancing tube 300. One end of the flow-enhancing tube 300 is connected to the injection port on the surface of the mold body 400. Its operating principle is based on the spiral design of the swirl channel 110. The drive motor 120 drives the rotating guide hopper 130 and extrusion shaft 140 to achieve liquid heating and flow compensation.

[0042] The swirl tube 100, as the main component of the injection mold, is equipped with a swirl channel 110 and a filling port 111. The swirl channel 110 is spirally wound around the surface of the swirl tube 100, and its inner wall is a smooth arc surface, which can reduce friction, ensure smooth flow of the plastic melt, and avoid condensation.

[0043] The filling port 111 is arranged tangentially to the surface of the cyclone 100 and is used to inject molten plastic and make it flow evenly in the cyclone 110 .

[0044] The drive motor 120 drives the extrusion shaft 140 through the output shaft, thereby driving the dynamic guide bucket 130 to rotate, thereby achieving the transmission and heating of the liquid flow. The extrusion shaft 140 passes through the interior of the cyclone 100 and is connected to the dynamic guide bucket 130 at the other end.

[0045] The moving guide hopper 130 is a conical structure, rotatably connected to the cyclone 100 via the extrusion shaft 140. Inside, it is equipped with a guide cone 131 and swirl vanes 132. The guide cone 131 is fixedly connected to the end of the extrusion shaft 140. The swirl vanes 132 work in conjunction with the swirl channel 110 to guide the liquid flow by rotating the moving guide hopper 130, ensuring uniform heating.

[0046] The heating ring seat 200 is fixed to one end of the cyclone tube 100 and is sleeved onto the outside of the moving guide hopper 130. A heating coil 220 is housed within the heating ring seat 200, which electrically heats the liquid flow. A thermostat module is built into the control terminal box 210, which controls the temperature of the heating coil 220 to ensure a stable temperature.

[0047] The flow-aiding tube 300 comprises a flow guide tube 310, a partition plate 320 fixed to the inside of the tube, an electric heating ring 330, and a tapered shaft 340. The electric heating ring 330 is sleeved around the outer circumference of the tapered shaft 340 and heats the liquid through inner and outer flow channels 311 and 312, improving its flow properties. The electric heating rings 330 are evenly arranged along the axial direction of the tube 310 to ensure temperature uniformity within the flow-aiding tube.

[0048] A first diverter ring 150 and a second diverter ring 160 are installed inside the cyclone 100 to divert and merge liquid flows. The first diverter ring 150 has a conical cross-section, while the second diverter ring 160 has a diamond-shaped cross-section, forming a Tesla valve structure. This structure effectively guides liquid flow through the diverter channel 151 and the converging channel 152, improving flow efficiency. It also utilizes a kinetic energy compensation mechanism between the flow channels to reduce condensation.

[0049] The heating ring 330 incorporates a built-in heating coil to ensure uniform heating of the flow channels 311 and 312 within the flow-aiding tube 300, thereby preventing condensation during the liquid flow process. The heating ring 330, in conjunction with the outer periphery of the tapered shaft 340, ensures uniform heat transfer throughout the flow-aiding tube system.

[0050] Example 2

[0051] In this embodiment, the main structure of the anti-condensation hot runner injection mold is the same as in Example 1. However, in this embodiment, the flow-aiding tube 300 further optimizes the design of the electric heating ring 330. The electric heating ring 330 uses a more efficient composite material, and the arrangement of its electric heating coils has also been adjusted, resulting in more uniform heating throughout the flow-aiding tube and faster temperature control response.

[0052] By optimizing the heat conduction path between the inner and outer flow channels 311 and 312 of the guide tube 310 , the temperature difference of the plastic melt during the flow process can be further reduced, thereby avoiding condensation.

[0053] Working principle:

[0054] Drive system operation: Drive motor 120 rotates extrusion shaft 140 via its output shaft, which in turn rotates dynamic guide hopper 130, achieving fluid transmission. The rotation of dynamic guide hopper 130 facilitates fluid flow through cyclone 110, creating a spiral flow within the cyclone, promoting heating and even distribution of the fluid.

[0055] Heat conduction and control: The heating coil 220 within the heating ring base 200 heats the liquid using electrical heating principles, while simultaneously controlling the constant temperature control module within the end box 210 to ensure temperature stability. The electric heating ring 330 within the flow-assisting tube 300 further heats the liquid, ensuring a uniform temperature throughout the injection molding process.

[0056] Liquid Heating and Flow: After entering the cyclone tube 100 from the filling port 111, the liquid flows through the cyclone channel 110 and into the moving guide bucket 130, where it forms a swirl under the action of the swirl vanes 132. The liquid is further heated by the guide cone 131 and swirl vanes 132 within the moving guide bucket 130. The liquid is effectively controlled by the diverter rings 150 and 160 to prevent condensation.

[0057] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0058] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An anti-condensation hot runner injection mold, characterized in that: A cyclone (100), a heating ring seat (200), a flow-assisting tube (300) and a mold body (400) connected to one end of the flow-assisting tube (300); a driving motor (120) is fixedly installed at one end of the cyclone (100); an output end of the driving motor (120) is fixedly connected to an extrusion shaft (140) that passes through the interior of the cyclone (100); the other end of the extrusion shaft (140) is fixedly connected to a moving guide bucket (130) that is rotatably connected to one end of the cyclone (100); the heating ring seat (200) is fixed to one end of the cyclone (100) and is sleeved on the outside of the moving guide bucket (130); the other end of the moving guide bucket (130) is connected to the flow-assisting tube ( The ends of the swirl tube (100) are connected, a first diverter ring (150) and a second diverter ring (160) which are sleeved on the surface of the extrusion shaft (140) are fixedly installed on the inner side of the swirl tube (100), a guide cone (131) and a swirl vane (132) located on the outer periphery of the guide cone (131) are fixedly installed on the inner side of the moving guide bucket (130), one end of the guide cone (131) is fixedly connected to the end of the extrusion shaft (140), the surface of the extrusion shaft (140) is provided with an extrusion swirl vane (141), the surface of the swirl tube (100) is provided with a swirl channel (110) and a filling port (111), and the port of the filling port (111) is connected to the end of the swirl channel (110).

2. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The swirl channel (110) is spirally connected to the surface of the swirl cylinder (100), the filling port (111) is arranged in a tangential direction with respect to the surface of the swirl cylinder (100), and the swirl channel (110) and the inner side of the swirl channel (110) are in the shape of an arc surface.

3. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The inner sides of the cyclone cylinder (100), the dynamic guide bucket (130) and the flow-assisting tube (300) are all provided with a high-temperature resistant anti-stick coating.

4. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The cross section of the first diverter ring (150) is conical, and the cross section of the second diverter ring (160) is rhombus-shaped. A diverging channel (151) and a converging channel (152) are respectively provided on the inner and outer sides of the first diverter ring (150). A flow guide channel (161) is provided on the inner side of the second diverter ring (160). One end of the diverging channel (151) and the converging channel (152) are connected and joined at the outer periphery of the second diverter ring (160).

5. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The outer periphery of the extrusion vane (141) is in sliding contact with the inner side of the second diverter ring (160), and the spiral directions of the extrusion vane (141) and the swirl vane (132) are uniform and the same as the spiral direction of the swirl channel (110).

6. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The movable guide bucket (130) is a conical structure, and the inner wall of the movable guide bucket (130) is arranged in parallel with the outer surface of the guide cone (131). The movable guide bucket (130), the guide cone (131) and the swirl vane (132) are metal components.

7. The anti-condensation hot runner injection mold according to claim 1, characterized in that: A control terminal box (210) is fixedly mounted on the surface of the heating ring seat (200), and a heating coil (220) is provided on the inner side of the heating ring seat (200). A constant temperature control module for the heating coil (220) is built into the control terminal box (210).

8. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The flow-aiding tube (300) comprises a flow guide tube (310), a partition plate (320) fixed to the inner side of the flow guide tube (310), an electric heating ring (330) and a conical core shaft (340); the electric heating ring (330) is sleeved on the outer periphery of the conical core shaft (340); an outer flow channel (311) is provided between the outer periphery of the electric heating ring (330) and the inner wall of the flow guide tube (310); an inner flow channel (312) is provided between the inner side of the electric heating ring (330) and the conical core shaft (340); and the outer flow channel (311) and the inner flow channel (312) are connected to the outer flow channel (311) at both ends.

9. The anti-condensation hot runner injection mold according to claim 8, characterized in that: The outer periphery of the conical core shaft (340) is parallel to the surface of the electric heating ring (330); the cross section of the electric heating ring (330) is conical; the outer flow channel (311) and the inner flow channel (312) are evenly distributed in the circumferential direction on the outer periphery of the conical core shaft (340) and are located between adjacent partition plates (320); an electric heating coil is provided inside the electric heating ring (330); and the electric heating ring (330) is evenly arranged along the axial direction of the guide tube (310).

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