Cooling module for an injection mold and injection mold

Abstract

The application relates to the material forming technical field and provides a cooling module of an injection mold and the injection mold, which comprises an airflow channel and a water flow channel, the water flow channel and the airflow channel are connected with each other through at least one micro hole, cooling water is arranged in the water flow channel, the airflow channel is connected with a negative pressure device or a positive pressure device to generate airflow and atomize the water entering through the micro hole into small water droplets, the airflow channel is provided with a non-linear separation channel, and the small water droplets collide with the inner wall under the action of inertia when flowing along the separation channel. The high-speed airflow atomizes the cooling water and drives the small water droplets to impact the high-temperature wall surface to evaporate and absorb heat, so that the rapid and uniform cooling of the mold is realized.

Description

Technical Field

[0001] This application relates to the field of material forming technology, and in particular to a cooling module for an injection mold and an injection mold. Background Technology

[0002] When injection molded parts have large wall thicknesses, the cooling and solidification rate is slow, resulting in lower production efficiency. Furthermore, the shrinkage during shrinkage may lead to material shortages. Even when using cooling water, because the mold temperature exceeds 100°C, if the water flow rate is low, the water entering the mold will vaporize rapidly, causing the mold temperature near the inlet to drop quickly while the temperature further away from the inlet remains higher, resulting in uneven temperature distribution. If a larger water flow rate is used, the water utilization efficiency is low, failing to fully utilize the water for heat dissipation and wasting water resources. Additionally, larger pipe designs are required, increasing manufacturing costs. Using compressible refrigerants for mold cooling is even more expensive and difficult to implement widely.

[0003] Chinese patent application CN118596499A discloses a mold heat exchange system, belonging to the field of plastic processing mold technology. It includes a cooling circulation system and a steam circulation system connected to the heat exchange channel of the mold. The cooling circulation system is used to send cooling water in an atomized state into the heat exchange channel to cool the mold. The cooling circulation system includes a vacuum pump connected to the heat exchange channel to control the pressure within the heat exchange channel. The steam circulation system is used to send steam into the heat exchange channel of the mold to heat the mold. However, the atomized water fails to make sufficient contact with the mold, resulting in the atomized water droplets being difficult to evaporate and absorb heat. Summary of the Invention

[0004] This application provides a cooling module for an injection mold and an injection mold, so as to at least solve the technical problems of cooling efficiency and uniformity in the prior art.

[0005] According to a first aspect of this application, a cooling module for an injection mold is provided, including an airflow channel and a water flow channel. The water flow channel and the airflow channel are interconnected through at least one micropore. Cooling water is provided in the water flow channel, and the airflow channel is connected to a negative pressure device or a positive pressure device, so that a high-speed airflow can be generated in the airflow channel. The high-speed airflow atomizes the water entering the airflow channel through the micropore into small water droplets. The airflow channel is provided with a non-linear separation channel. When the small water droplets flow along the non-linear separation channel, they collide with the inner wall of the separation channel under the action of inertia.

[0006] Compared with existing technologies, the cooling module of this application has the following beneficial effects: Utilizing Bernoulli's principle, the high-speed airflow in the airflow channel can generate low pressure. The negative pressure draws water from the water flow channel into the airflow channel. Under the action of the high-speed airflow, the atomized water forms small water droplets that follow the airflow. After entering the separation channel, they collide with the inner wall of the separation channel under the action of inertia. The high temperature of the separation channel causes the small water droplets to evaporate in the airflow channel and absorb the heat of the mold, thereby achieving rapid cooling of the mold. Air also has a certain heat dissipation effect. The high-speed airflow can make the distribution of small water droplets more uniform, avoid the local accumulation of small water droplets, and make the cooling more uniform.

[0007] In one embodiment, the airflow channel is provided with an air inlet and an air outlet. The air outlet is connected to a negative pressure device, and the air inlet is connected to a positive pressure device. The negative pressure device provides negative pressure to the airflow channel, and the positive pressure device provides positive pressure to the airflow channel. The negative pressure device is a vacuum pump, and the positive pressure device is a turbine fan. After the small water droplets evaporate, the air pressure in the separation channel will rise. To avoid airflow reversal, both a negative pressure device and a positive pressure device need to be set up simultaneously. On the one hand, this can increase the airflow speed, and on the other hand, it can prevent air reversal, thereby improving heat exchange efficiency and achieving rapid heat dissipation and cooling.

[0008] In one embodiment, the separation channel is equipped with multiple staggered baffles, which can change the direction of airflow. The atomized water droplets have relatively high inertia and can follow the airflow, but when the airflow changes direction, some droplets at the edges lag behind. When the flow direction changes, these droplets can collide with the baffles in the separation channel. The droplets adhering to the baffles absorb heat and evaporate, while some droplets in the central area follow the airflow, contact other baffles, and absorb heat and evaporate, thus achieving uniform heat dissipation.

[0009] In one embodiment, the baffle is equipped with a pivot shaft, allowing it to rotate relative to the inner wall of the separation channel. The baffle also features a temperature controller, enabling it to rotate to different positions relative to the inner wall of the separation channel as the temperature changes. When the baffle temperature is high, it rotates to an angle with a larger windward area under the control of the temperature controller, causing more small water droplets to collide with and contact the baffle, resulting in a rapid temperature drop. When the baffle temperature is low, it rotates to an angle with a smaller windward area under the control of the temperature controller, causing fewer small water droplets to collide with and contact the baffle, improving heat dissipation in other areas and resulting in more uniform temperature distribution across different regions. In some embodiments, the temperature controller can be an integrated component of a temperature sensor and a motor, detecting temperature changes and adjusting the baffle accordingly, thus allowing for precise adjustment of the baffle.

[0010] In one embodiment, the temperature controller is a metal sheet with shape memory function or a metal sheet made of two materials with different coefficients of thermal expansion pressed together. The first end of the metal sheet is fixed to a baffle plate, and the second end is fixed to the inner wall of a rotating shaft or a separation channel. This allows the metal sheet to bend in different directions when the temperature changes, pushing the baffle plate to rotate relative to the separation channel. The shape memory metal can have different shapes at different temperatures, and the bimetallic strip also twists when the temperature changes; that is, as the temperature rises, the metal with the higher coefficient of thermal expansion bends towards the side with the lower coefficient of thermal expansion, thus driving the baffle plate to rotate relative to the rotating shaft.

[0011] In one embodiment, the baffle has a central shaft hole, a rotating shaft is disposed in the shaft hole, and a gap is provided between the shaft hole and the rotating shaft. A metal sheet is spirally wound around the rotating shaft, so that when the temperature changes, the metal sheet can be spirally wound or unwound in the opposite direction, causing the baffle to rotate relative to the rotating shaft.

[0012] In one embodiment, the baffle is a flow guide column with a crescent-shaped cross-section, which is arranged perpendicular to the airflow direction. Alternatively, multiple baffles with tile-shaped cross-sections can be arranged. The flow guide column or baffle can be used to adsorb small water droplets to achieve rapid and uniform cooling.

[0013] In one embodiment, the separation channel is a curved airflow channel that extends along a spiral or wavy line, resulting in a simple structure and low manufacturing cost.

[0014] An injection mold includes a punch and a die, wherein the punch and / or die are provided with the aforementioned cooling module. This allows the mold to achieve uniform and rapid cooling, improving mold production efficiency.

[0015] In one embodiment, the cooling module is integrated with the punch or die, and the punch or die has multiple separation channels. The integrated structure of the mold and cooling module results in lower manufacturing costs.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, wherein: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 A schematic diagram of the split structure of the cooling module according to an embodiment of this application is shown; Figure 2 It shows that at lower temperatures Figure 1 Enlarged schematic diagram of a portion of the baffle at point A; Figure 3 It shows that when the temperature is high Figure 1 Enlarged schematic diagram of a portion of the baffle at point A; Figure 4 A half-sectional view of the assembled state of the cooling module according to an embodiment of this application is shown; Figure 5 This paper shows a schematic diagram of the split structure of the cooling module in an embodiment of the crescent-shaped airflow guide column of this application; Figure 6 This paper shows a schematic diagram of the cavity plate structure of the cooling module in the embodiment of the crescent-shaped flow guide column of this application; Figure 7 This paper shows a schematic diagram of the split structure of the cooling module of the curved and extended airflow channel embodiment of this application; Figure 8 A schematic diagram of the cavity plate structure of the cooling module in the embodiment of the curved and extended airflow channel of this application is shown; Figure 9 A schematic diagram of the cavity plate structure of the cooling module in the embodiment of the spiral airflow channel of this application is shown; Figure 10 A perspective view of an injection mold according to an embodiment of this application is shown; Figure 11 A half-sectional schematic diagram of the injection mold of this application is shown.

[0019] Explanation of the labels in the diagram: 1-Airflow channel; 2-Water flow channel; 3-Micropore; 4-Separation channel; 5-Air inlet; 6-Exhaust outlet; 7-Upper mold base; 8-Lower mold base; 9-Baffle; 10-Rotating shaft; 11-Temperature controller; 12-Metal sheet; 13-Shaft hole; 14-Guide column; 15-Punch; 16-Die; 17-Cavity plate; 18-Cover plate; 20-Upper cover plate; 21-Lower cavity plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] Example 1 like Figure 1 and Figure 4As shown, this embodiment provides a cooling module for an injection mold. The cooling module includes an airflow channel 1 and a water flow channel 2, which are interconnected through at least one micropore 3. Specifically, the airflow channel 1 and the water flow channel 2 are arranged adjacent to each other in space, and the micropore 3 serves as the fluid communication interface between them. Its aperture size is configured to allow liquid water to pass through under a specific pressure difference. It should be understood that although... Figure 1 The diagram illustrates a specific channel arrangement, but in other embodiments, the airflow channel 1 and water flow channel 2 can also be coaxially nested, parallel, or otherwise arbitrarily positioned, as long as the micropores 3 can ensure fluid conduction between the two channels. The number of micropores 3 can be one or more. When multiple micropores 3 are used, they can be arrayed along the channel extension direction or distributed in other geometric patterns to adjust the water inflow and atomization density per unit length. If a multi-part mold is used, one micropore 3 can be provided for each injection molded part, resulting in more uniform heat dissipation.

[0023] like Figure 1 and Figure 4 As shown, airflow channel 1 and water flow channel 2 are perpendicular to each other and connected by micropores 3. To increase the airflow velocity, the cross-sectional area of ​​airflow channel 1 is reduced at the micropores 3. The cooling module can be manufactured as a single piece using 3D printing technology, but the cost is high. It is usually composed of a cavity plate 17 and a cover plate 18. The cavity plate 17 is machined to form airflow channel 1 and water flow channel 2, and then the cover plate 18 and sealing ring are used to achieve closure, which reduces the cost.

[0024] like Figure 1 and Figure 4 As shown, cooling water is installed in the water flow channel 2, and the airflow channel 1 is connected to a negative pressure device or a positive pressure device, enabling airflow to be generated within the airflow channel 1. This airflow atomizes the water entering the airflow channel 1 through the micropores 3 into small water droplets. During this process, based on Bernoulli's principle, when a high-speed airflow is generated within the airflow channel 1, the static pressure at the outlet of the micropores 3 decreases, creating a pressure difference between the water flow channel 2 and the airflow channel 1. This pressure difference drives the cooling water to be drawn into the airflow channel 1 through the micropores 3. The high-speed airflow exerts a strong shear force on the drawn-in water, breaking it down and dispersing it into micron-sized water droplets. The negative pressure device mentioned here can be a vacuum pump, an induced draft fan, or other suction equipment; the positive pressure device can be a turbine fan, an air compressor, or other blower equipment, or a combination of both. This embodiment does not limit the specific power source form, as long as a sufficient airflow velocity field can be established within the airflow channel 1 to achieve water intake and atomization. Compared to traditional pressure nozzle atomization, this atomization method does not require maintaining high pressure in the cooling water circuit, reducing sealing requirements and leakage risks. Simultaneously, it utilizes airflow energy to achieve secondary water refinement, increasing the heat exchange surface area.

[0025] like Figure 1 and Figure 4As shown, the airflow channel 1 is equipped with a non-linear separation channel 4. When small water droplets flow along the non-linear separation channel 4, they collide with the inner wall of the separation channel 4 under the action of inertia. This is the core mechanism for achieving efficient heat exchange in this embodiment. Specifically, "non-linear" means that the central axis of the separation channel 4 is not a single straight line segment, but includes geometric changes such as bending, turning, waves, or spirals. The reason for adopting a non-linear design is that in a straight channel, small water droplets, due to their small mass, easily follow the airflow streamline and are difficult to actively contact the high-temperature wall surface, resulting in a large number of water droplets being discharged without evaporation, leading to low heat exchange efficiency. However, in the non-linear separation channel 4, the airflow is forced to frequently change direction. Small water droplets with mass cannot completely follow the sharp changes in airflow due to inertia, thus deviating from the streamline and migrating towards the outer wall of the channel, eventually colliding with the high-temperature inner wall of the separation channel 4. After the collision, the small water droplets spread and evaporate on the high-temperature wall surface, undergoing a phase change and absorbing heat, directly carrying away the heat from the mold. It should be understood that the specific form of the non-linear separation channel 4 is not limited to that shown in the figure. Any flow channel geometry that can generate normal acceleration in the airflow and thus induce inertial separation of droplets falls within the protection scope of this embodiment. For example, the separation channel 4 can be a continuous S-shaped bend, a spiral coil, a sawtooth channel, or an irregularly shaped channel with local sudden expansion / contraction structures. This forced heat transfer mechanism based on inertial collision effectively solves the technical problem in the prior art where atomized water droplets are suspended in the core of the airflow without hitting the walls, significantly improving the utilization rate of the cooling medium and the uniformity of mold cooling.

[0026] Example 2 like Figure 1 and Figure 4 As shown, based on Embodiment 1, this embodiment further specifies the power source configuration and flow channel reinforcement structure of the cooling module. As an optional implementation, the airflow channel 1 is provided with an air inlet 5 and an exhaust outlet 6. The exhaust outlet 6 is connected to a negative pressure device, and the air inlet 5 is connected to a positive pressure device. The negative pressure device provides negative pressure to the airflow channel 1, and the positive pressure device provides positive pressure to the airflow channel 1. Specifically, as... Figure 1As shown, the positive pressure device can be a turbine fan, a high-pressure air tank, or a blower, used to inject high-pressure air into the air inlet 5 to establish an initial flow velocity; the negative pressure device can be a vacuum pump or an induced draft fan, connected to the exhaust port 6 to maintain a low-pressure suction state at the end of the flow channel. This design of positive and negative pressure coordinated drive is mainly to solve the limitations of a single power source under phase change cooling conditions. Since small water droplets will expand in volume when evaporating in the high-temperature separation channel 4, if only single-end negative pressure suction is used, the back pressure of the vapor generated by evaporation can easily cause local airflow deceleration or even reversal, thereby weakening the atomization effect and reducing heat exchange efficiency. By setting both positive and negative pressure devices simultaneously, a stable directional pressure gradient can be established throughout the airflow channel 1. On the one hand, this significantly improves the airflow velocity, enhances the shear atomization capability and convective heat transfer coefficient; on the other hand, it effectively overcomes the airflow fluctuations caused by the evaporation back pressure, ensuring the continuity and stability of the heat dissipation process.

[0027] like Figure 1 and Figure 5 As shown, in one optional implementation, the separation channel 4 is equipped with multiple staggered baffles 9, which allow the baffles 9 to continuously change the airflow direction. Specifically, the baffles 9 are arranged at intervals along the extension direction of the separation channel 4, and adjacent baffles are staggered in the airflow cross-section, forming a maze-like flow channel structure. When a high-speed airflow carrying small water droplets flows through these staggered baffles 9, the airflow is forced to frequently change direction, generating strong shear layers and local vortices. Because small water droplets have greater inertia than air, at the moment of a sharp change in airflow direction, the small water droplets in the edge region cannot completely follow the streamline movement, thus leaving the mainstream region and colliding with the surface of the baffles 9 or the inner wall of the separation channel 4. The small water droplets adhering to the surface of the baffles 9 quickly absorb heat and evaporate, while the small water droplets in the central region are transported to other baffle regions under the action of turbulent pulsation to continue participating in heat exchange. This passive turbulence enhancement mechanism not only increases the contact area between the gas, liquid, and solid phases, but also breaks the thermal resistance effect of the boundary layer, achieving uniform heat dissipation across the entire flow channel cross-section. It should be understood that the specific shape, number, and staggered angle of the baffle 9 can be adjusted according to actual cooling requirements, and is not limited to the flat plate structure shown in the figure. It can also be an airfoil, a sawtooth shape, or other geometry that can induce airflow separation.

[0028] like Figure 7 and Figure 8 As shown, in another optional implementation, the separation channel 4 is a curved and extended airflow channel. The separation channel 4 can be set according to the high-temperature area with a large wall thickness of the injection molded part. Multiple S-shaped bends can be set in the higher-temperature area, and a small number of bends can be set in the lower-temperature area, such as... Figure 9As shown, the separation channel 4 extends along a spiral, and the air inlet 5 needs to be located at the center of the spiral to improve the cooling rate at the center. In some embodiments, the separation channel 4 can extend along a wavy line. This design further enhances the inertial separation effect of the droplets at the macroscopic geometric configuration level. Specifically, when the separation channel 4 adopts a continuous curved shape such as a spiral or wavy line, the airflow will be subjected to continuous centrifugal force when flowing through the bend. Since the density of the droplets is much greater than that of air, the centrifugal force they experience is also correspondingly greater, thus being continuously "thrown" out towards the outer wall, increasing the collision frequency and residence time of the droplets with the high-temperature wall. Compared with the general non-linear design mentioned in Embodiment 1, the spiral or wavy channel provides a more regular and continuous inertial separation field, which can extend the effective heat exchange process without significantly increasing the flow resistance. In addition, this regular curved flow channel is also easier to manufacture through precision casting or 3D printing processes, which helps to reduce the mold processing cost. The cover plate 18 can be an integral structure with the mold cavity plate, or the cavity plate 17 can be an integral structure with the mold cavity plate.

[0029] It should be noted that the staggered baffle 9 structure and the spiral / wave-shaped separation channel 4 are not mutually exclusive, but rather alternatives or superimposed solutions that can be flexibly selected according to actual working conditions. For example, in the production of thick-walled injection molded parts with extremely high cooling efficiency requirements, staggered baffles 9 can be further added inside the wave-shaped separation channel 4 to allow the macroscopic centrifugal separation and microscopic turbulent collision mechanisms to work synergistically, thereby multiplying the heat transfer performance; while in scenarios sensitive to pressure drop or with limited space, one of the enhancement methods can be selected alone. This modular combination design approach enables the cooling module of this application to adapt to diverse mold cooling needs, expanding the applicability and protection scope of the technical solution.

[0030] Example 3 like Figure 1 and Figure 5As shown, based on Embodiment 2, this embodiment further specifies the adaptive adjustment mechanism of the baffle 9. As an optional implementation, the baffle 9 is equipped with a rotating shaft 10, allowing it to rotate relative to the inner wall of the separation channel 4. The baffle 9 is also equipped with a temperature controller 11, enabling it to rotate to different positions relative to the inner wall of the separation channel 4 when the temperature changes. Specifically, this design establishes a direct functional mapping relationship between temperature and angle. When the temperature in a local area of ​​the separation channel 4 rises, the temperature controller 11 senses the heat and drives the baffle 9 to rotate around the rotating shaft 10 to an angle with a larger windward area, thereby increasing the probability of intercepting small water droplets and enhancing the evaporation heat absorption efficiency of that area. Conversely, when the temperature in that area drops below a set threshold, the temperature controller 11 drives the baffle 9 to rotate back to an angle with a smaller windward area, reducing the amount of droplet impact, preventing overcooling, and guiding the airflow carrying small water droplets downstream or to other high-temperature areas. It should be understood that although this embodiment preferably adopts a purely mechanical thermal drive structure, in other embodiments, the temperature controller 11 can also adopt a combination of a temperature sensor and a micro motor, achieving more precise angle control through electrical signal feedback. However, considering the small internal space of the injection mold, the high temperature and high pressure working environment, and the extremely high requirements for maintenance-free operation, the purely mechanical structure does not require external power supply and signal lines, and has higher reliability and integration. Therefore, it is the more recommended implementation method in this application.

[0031] like Figure 1 and Figure 2 As shown, as a specific implementation of the aforementioned temperature controller 11, the temperature controller 11 is a metal sheet with shape memory function or a metal sheet 12 made of two materials with different coefficients of thermal expansion pressed together. The first end of the metal sheet 12 is fixed to the baffle 9, and the second end of the metal sheet 12 is fixed to the inner wall of the rotating shaft 10 or the separation channel 4, so that when the temperature changes, the metal sheet 12 bends in different directions, pushing the baffle 9 to rotate relative to the separation channel 4. Figure 2 As shown, specifically, when a bimetallic strip is used, the difference in thermal expansion coefficients between the two metal materials is utilized. When the temperature rises above 135°C, the elongation of the high expansion layer is greater than that of the low expansion layer, forcing the metal strip 12 to bend towards the low expansion layer side. This means the metal strip 12 is in an open state, pushing the baffle 9 to rotate. The baffle 9 also has a large blocking area, enabling it to adsorb more small water droplets; for example... Figure 3As shown, when the temperature drops below 90℃, the elongation of the high-expansion layer is less than that of the low-expansion layer, forcing the metal sheet 12 to bend towards the high-expansion layer, i.e., the metal sheet 12 is in a coiled state, pushing the baffle 9 to rotate. The baffle 9 also has a smaller blocking area, enabling it to adsorb fewer small water droplets. When a shape memory alloy (such as a nickel-titanium alloy) is used, the lattice structure transformation that occurs at a specific phase transition temperature generates a restoring force, driving the metal sheet 12 to recover its preset shape. Regardless of the material used, the mechanical transmission path is: thermal energy → deformation of the metal sheet 12 → application of pushing or pulling force to the baffle 9 → overcoming fluid resistance and friction → rotation of the baffle 9 around the axis 10. This method of directly converting thermal energy into mechanical energy eliminates intermediate energy conversion steps, resulting in a fast response speed and an extremely compact structure. For example, the metal sheet 12 can be arranged to extend along the surface of the baffle 9, with one end welded or riveted to the baffle body and the other end fixed to the surface of the rotating shaft 10 or the groove in the side wall of the separation channel 4. When the temperature changes and causes the curvature of the metal sheet 12 to change, the displacement component of its free end forms an effective lever arm to drive the baffle to rotate.

[0032] like Figure 1 and Figure 2 As shown, to further optimize the smoothness and stability of the rotating mechanism, as an optional implementation, the baffle 9 has a central shaft hole 13, and the rotating shaft 10 is disposed in the shaft hole 13, with a gap between the shaft hole 13 and the rotating shaft 10. A metal sheet 12 is spirally wound around the rotating shaft 10. Specifically, the metal sheet 12 is spirally and tightly wound around the outer circumference of the rotating shaft 10, with one end fixed to the rotating shaft 10 and the other end extending to and connected to the baffle 9. When temperature changes cause the metal sheet 12 to expand and contract radially, due to the geometric constraints of the spiral structure, this linear deformation is forcibly converted into a rotational torque around the axis of the rotating shaft 10, thereby efficiently driving the baffle 9 to rotate. Compared to a simple cantilever beam bending drive, the spiral winding structure can provide a larger output torque and more uniform stress distribution, making it less prone to plastic fatigue failure. Meanwhile, the design of the gap reserved between the shaft hole 13 and the rotating shaft 10 is crucial. During mold manufacturing and assembly, minor misalignments due to coaxiality errors or thermal deformation are inevitable. If interference fits or zero-clearance fits are used, assembly stress can easily lead to rotational jamming or even seizing. This clearance provides the necessary floating space for the rotating shaft 10, allowing it to automatically align within a certain range. This eliminates the negative impact of machining errors and thermal stress on rotational flexibility, ensuring that the baffle 9 can sensitively respond to temperature changes throughout its entire lifespan. It should be understood that the size of the clearance needs to be comprehensively determined based on the diameter of the rotating shaft 10, the operating temperature rise range, and machining accuracy. It must ensure smooth rotation while avoiding baffle wobbling or abnormal noise caused by excessive clearance.

[0033] Example 4 like Figure 5 and Figure 6 As shown, in one optional implementation, the turbulence baffle is a crescent-shaped guide column 14, which is arranged perpendicular to the airflow direction. Specifically, as... Figure 1 As shown, the guide column 14 is fixedly installed inside the separation channel 4, with its axis approximately perpendicular to the mainstream direction of the airflow. The cross-section of the guide column 14 presents a concave crescent shape, and this specific geometric configuration constitutes a static passive droplet capture structure. Unlike the dynamic turbulence baffle 9 driven by the temperature controller 11 in Embodiment 3, the guide column 14 in this embodiment maintains a fixed position and attitude during operation, relying entirely on its own geometric characteristics to intervene in the flow field and enhance heat transfer. It should be understood that although this embodiment uses a crescent shape as an example, in other embodiments, any column structure with similar concave curved surface features that can form a local stagnation zone or recirculation zone, such as a tile-shaped, C-shaped, or U-shaped cross-section column, can be used as an alternative form of the guide column 14, as long as it can achieve the droplet capture and retention functions described below.

[0034] From the perspective of fluid dynamics and heat transfer mechanisms, the crescent-shaped guide column 14 enhances the cooling effect through two levels of action. First, on the windward side, the concave surface of the crescent shape forms a natural "trapping" chamber. When a high-speed airflow carrying small water droplets passes through this area, some droplets that might otherwise bypass the streamline are directly intercepted and accumulated by the concave cavity, significantly increasing the collision frequency and contact area between the droplets and the solid wall, allowing more droplets to spread on the high-temperature wall and undergo phase change to absorb heat. Second, on the leeward side, the protruding tail of the crescent shape induces a stable wake vortex or backflow zone downstream. Tiny droplets entering this zone are not immediately carried away by the mainstream, but repeatedly swirl under the action of the vortex, thus greatly extending the residence time of the droplets in the high-temperature environment. This "retention effect" induced by the geometry effectively compensates for the short contact time of droplets when relying solely on inertial collisions, improving the evaporation efficiency of a single pass.

[0035] Designing the guide column 14 as a static structure rather than a dynamically adjustable structure reflects the diversity and specificity of the technical solution in this application under different application requirements. Compared with the adaptive temperature control turbulence mechanism in Embodiment 3, although this embodiment lacks real-time adjustment capability when facing drastically fluctuating heat loads, it achieves extreme structural simplicity and operational reliability. Since there are no moving parts such as the rotating shaft 10 and metal sheet 12, the guide column 14 is free from the risk of mechanical wear, jamming, or fatigue failure, achieving true zero-maintenance operation, and the manufacturing process is simpler and less expensive. Therefore, for injection molding processes with relatively stable heat loads, extremely high requirements for equipment maintenance-free operation, or cost sensitivity, the crescent-shaped guide column 14 is a more preferred technical solution. This implementation also powerfully demonstrates that the overarching concept of "turbulence baffle" in this application not only encompasses complex movable mechanical components but also includes static functional components based on purely geometric shapes, such as square, elliptical, and triangular shapes.

[0036] Example 5 like Figure 10 and Figure 11 As shown, this embodiment provides an injection mold including a punch 15 and a die 16, with the cavity for the injection part located between the punch 15 and the die 16. The punch 15 and / or the die 16 are provided with the cooling modules described in the previous embodiments. Specifically, the cooling modules may be provided only in the punch 15, only in the die 16, or simultaneously in both the punch 15 and the die 16, depending on the specific geometry, wall thickness distribution, and concentrated heat load area of ​​the injection molded part. For example, for deep-cavity thin-walled products, it may be sufficient to arrange a cooling module on the punch 15 side to meet the heat dissipation requirements; while for thick-walled block products, it is usually necessary to arrange cooling modules on both sides of the punch 15 and the die 16 to achieve balanced cooling on both sides. It should be understood that although Figure 10 The diagram illustrates the approximate location of the cooling module within the mold. However, in practical applications, the spatial orientation of the airflow channel 1, water flow channel 2, and separation channel 4 should be adaptively designed based on the curvature variations of the mold surface to ensure that the cooling medium can cover all critical heat exchange areas.

[0037] As an optional implementation, the upper cover plate 20 of the cooling module of the upper mold base 7 is integrated with the punch 15, and the lower cavity plate 21 of the cooling module of the lower mold base 8 is integrated with the die 16. The die 16 is provided with multiple separation channels 4. The term "integrated structure" here does not only refer to the overall appearance, but specifically to the continuous metallurgical bond or dense physical fusion between the wall surface of the separation channel 4 and the mold base material, without any assembly gaps, adhesive layers, or mechanical mating surfaces between them. Specifically, this integrated structure can be achieved through machining or advanced manufacturing processes such as metal 3D printing (e.g., selective laser melting, SLM), precision casting, or diffusion welding. The separation channels 4 can be generated directly in situ inside the mold base or manufactured using traditional machining. The integrated structure of this embodiment completely eliminates this interfacial thermal resistance, allowing the heat from the mold cavity surface to be seamlessly transferred to the gas-liquid two-phase flow within the separation channel 4 via pure thermal conduction, significantly improving the overall thermal conductivity and temperature response sensitivity.

[0038] Furthermore, by overcoming the geometric limitations of traditional straight-line drilling, multiple separation channels 4 can be freely arranged within the mold according to the contours of complex surfaces, forming a true conformal cooling network. For example, multiple separation channels 4 can be arranged in parallel to cover large flat areas to ensure cooling uniformity; they can also be arranged in series and meandering around local hot spots to enhance heat dissipation in specific areas; and the spacing between adjacent separation channels 4 can be dynamically adjusted according to the changes in the wall thickness gradient of the injection molded part, i.e., denser channel distribution in thick-walled, high-temperature areas and sparser channel distribution in thin-walled, low-temperature areas. This customized flow channel layout based on heat load distribution allows for precise matching of cooling capacity with the heat generation requirements of each area of ​​the mold, effectively avoiding the local overheating or overcooling phenomena common in traditional cooling methods, thereby significantly shortening the molding cycle while ensuring product quality. It should be understood that although additive manufacturing is preferably used in this embodiment to realize the above-mentioned complex integrated conformal flow channel, in other embodiments, as long as the separation channels 4 can be tightly bonded to the mold substrate without gaps, and multiple non-linear flow channels can be arranged to adapt to surface features, regardless of the specific processing technology used, they all fall within the scope of protection of this application.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The specific structures in the foregoing embodiments, such as the connection method between the airflow channel 1 and the water flow channel 2, the non-linear configuration of the separation channel 4, the adaptive adjustment mechanism of the turbulence baffle 9, and the geometric shape of the guide column 14, are all intended to exemplify the technical concept of this application, and not to exhaustively limit the scope of protection of this application. Any person skilled in the art, within the scope of the technology disclosed in this application, based on the core technical principles of fluid dynamics atomization, inertial collision heat transfer, and adaptive temperature adjustment disclosed in this application, can easily conceive of corresponding changes, substitutions, or combinations. For example, replacing mechanical temperature control with electronic drive, replacing the spiral wound metal sheet with other heat-engine conversion structures, or extending and adjusting the wavy line of the separation channel to other equivalent curved configurations, etc., should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling module for an injection mold, characterized in that, It includes an airflow channel (1) and a water flow channel (2). The water flow channel (2) and the airflow channel (1) are interconnected through at least one micropore (3). Cooling water is provided in the water flow channel (2). The airflow channel (1) is connected to a negative pressure device and a positive pressure device, so that airflow can be generated in the airflow channel (1). The water entering the airflow channel (1) through the micropore (3) is atomized into small water droplets by the airflow. The airflow channel (1) is provided with a non-linear separation channel (4). When the small water droplets flow along the separation channel (4), they collide with the inner wall of the separation channel (4) under the action of inertia. The airflow channel (1) is provided with an air inlet (5) and an exhaust outlet (6). The exhaust outlet (6) is connected to the negative pressure device, and the air inlet (5) is connected to the positive pressure device. The negative pressure device provides negative pressure to the airflow channel (1), and the positive pressure device provides positive pressure to the airflow channel (1). The positive pressure device is used to inject high-pressure air into the air inlet (5) to establish an initial flow rate; The negative pressure device is connected to the exhaust port (6) to maintain a low-pressure suction state at the end of the flow channel. By simultaneously setting a positive pressure device and a negative pressure device, a stable directional pressure gradient is established throughout the entire flow channel (1).

2. The cooling module of the injection mold according to claim 1, characterized in that, The separation channel (4) is provided with multiple staggered baffles (9), which enable the baffles (9) to change the direction of airflow.

3. The cooling module for the injection mold according to claim 2, characterized in that, The turbulence baffle (9) is provided with a rotating shaft (10) so that the turbulence baffle (9) can rotate relative to the inner wall of the separation channel (4). The turbulence baffle (9) is provided with a temperature controller (11) so that the turbulence baffle (9) can rotate relative to the inner wall of the separation channel (4) to different positions when the temperature changes.

4. The cooling module of the injection mold according to claim 3, characterized in that, The temperature controller (11) is a metal sheet (12) with shape memory function or a metal sheet (12) made of two materials with different coefficients of thermal expansion. The first end of the metal sheet (12) is fixed to the baffle (9), and the second end of the metal sheet (12) is fixed to the rotating shaft (10) or the inner wall of the separation channel (4), so that when the temperature changes, the metal sheet (12) bends in different directions and pushes the baffle (9) to rotate relative to the separation channel (4).

5. The cooling module of the injection mold according to claim 4, characterized in that, The baffle (9) has a shaft hole (13) at its center, the rotating shaft (10) is disposed in the shaft hole (13), there is a gap between the shaft hole (13) and the rotating shaft (10), and the metal sheet (12) is spirally wound around the rotating shaft (10).

6. The cooling module of the injection mold according to claim 2, characterized in that, The turbulence baffle (9) is a flow guide column (14) with a crescent-shaped cross section, and the flow guide column (14) is arranged perpendicular to the airflow direction.

7. The cooling module of the injection mold according to claim 1, characterized in that, The separation channel (4) is a curved and extended channel, which is set along a spiral or wavy line.

8. An injection mold, characterized in that, It includes a punch (15) and a die (16), wherein the punch (15) and / or the die (16) are provided with the cooling module as described in claim 1.

9. The injection mold according to claim 8, characterized in that, The cooling module is an integral structure with the punch (15) or the die (16), and the punch (15) or the die (16) is provided with multiple separation channels (4).

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