Water cooling system and injection molding equipment comprising same

Abstract

The invention relates to a water cooling system and injection molding equipment comprising the same. The water cooling system is configured to cool the forming mold by circulating cooling water. The water cooling system comprises a cooling channel, a coolant supply pipe, a coolant recovery pipe and a baffle module. The cooling channel defines a linear flow path within the forming mold and has: a first end as a channel inlet opening toward the exterior of the forming mold; and a second end defining a transition section and being a closed end of the rectilinear flow path, where the rectilinear flow path extends through at least a portion of the interior of the molding mold toward the injection molded product. The coolant supply pipe supplies cooling water to the cooling passage. The coolant recovery pipe recovers cooling water from the cooling passage.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0089502, filed with the Korean Intellectual Property Office on July 8, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to a water-cooling system for improving cooling efficiency and an injection molding apparatus including the water-cooling system. More specifically, this disclosure relates to a cooling system and an injection molding apparatus including the cooling system, which enables stable circulation of cooling water and rapid and uniform cooling of the mold, thereby improving the quality and production efficiency of high-precision large injection-molded products such as hydrogen tank liners. Background Technology

[0004] Plastic injection molding technology can be used in a variety of industrial fields. For example, plastic injection molding involves injecting molten plastic resin into a mold to form a product with a predetermined shape.

[0005] In some cases, the plastic injection molding process includes injection, cooling, and ejection operations. During the injection operation, molten plastic resin at high temperature is injected into the mold cavity under high pressure. During the cooling operation, the injected resin is cooled and solidified, and during the ejection operation, the solidified product separates from the mold.

[0006] In some cases, cooling operations can affect the final quality of the product and productivity. For example, if the temperature inside the mold is uneven or the cooling rate is slow, the product may deform or develop surface defects. In some cases, for large plastic parts such as hydrogen tank liners, low mold cooling efficiency can lead to increased cooling time and decreased productivity.

[0007] In some cases, cooling methods require a long path for the cooling water to reach the product, which leads to decreased cooling efficiency and increased resistance to cooling water flow.

[0008] In some cases, the product may deform or develop surface defects due to uneven temperature distribution of the cooling water inside the mold.

[0009] In some cases, the cooling efficiency is higher in the lower mold because the uppermost part of the cooling water channel is closest to the molded product. In some baffle designs, the cooling efficiency at the uppermost part of the cooling water channel is often lower.

[0010] For example, during the manufacturing of hydrogen tank liners, the airtightness and durability of the liner may be reduced when the temperature of the upper and lower parts of the mold is uneven.

[0011] In addition, if the cooling time is extended, the production time will also increase, leading to a decrease in productivity and an increase in manufacturing costs. Summary of the Invention

[0012] According to one aspect of the subject matter described in this application, a water cooling system for an injection molding apparatus is configured to circulate cooling water to cool the molding die. The water cooling system includes: a cooling channel defining a linear flow path within the molding die, the cooling channel having: (i) a first end defining a channel inlet opening toward the exterior of the molding die; and (ii) a second end defining a transition section and being a closed end of the linear flow path extending toward the injection-molded product through at least a portion of the interior of the molding die; a coolant supply pipe configured to supply cooling water to the cooling channel; a coolant recovery pipe configured to receive cooling water from the cooling channel; and a baffle module at least partially housed within the cooling channel and defining a circulation path within the cooling channel, the baffle module being configured to move cooling water introduced through the coolant supply pipe along the circulation path and discharge cooling water to the coolant recovery pipe. The baffle module includes a baffle screw having a cylindrical shape and being housed within the cooling channel along a straight flow path. The baffle screw includes a plurality of threaded peaks projecting from the outer periphery of the baffle screw in an inclined direction. The baffle screw is configured to rotate within the cooling channel, thereby causing cooling water to move along a predetermined path.

[0013] An embodiment of this aspect may include one or more of the following features. For example, the baffle screw may further include: a threaded contact surface defining a curved surface extending helically along the outermost periphery of a plurality of thread peaks, the threaded contact surface contacting the inner periphery of a cooling channel; and a threaded valley, the threaded valley being a groove defined between the plurality of thread peaks, the threaded valley defining a helical flow path between the baffle screw and the inner periphery of the cooling channel.

[0014] In some embodiments, the baffle screw may define a discharge orifice within the baffle screw, the discharge orifice extending longitudinally along the baffle screw, wherein the discharge orifice provides a flow path connecting opposite ends of the baffle screw to each other. In some examples, the water cooling system may include: a drive module disposed outside the cooling channel and configured to generate rotational force, wherein the baffle module further includes: a coupling housing configured to close the channel inlet, the coupling housing defining a pin through-hole and a coolant connection path; and a power transmission pin including (i) a first end coupled to the drive module and (ii) passing through the pin through-hole and coupled to a second end of the baffle screw housed within the cooling channel, the power transmission pin being configured to transmit rotational force from the drive module to the baffle screw.

[0015] In some embodiments, the power transmission pin may define an extended discharge path longitudinally within the power transmission pin, wherein a second end of the power transmission pin is connected to an end of the baffle screw facing outwards from the cooling channel, and the extended discharge path is in fluid communication with the discharge orifice of the baffle screw. In some examples, the coolant connection path may be connected to a coolant supply pipe and configured to guide cooling water supplied from the coolant supply pipe into the cooling channel.

[0016] In some embodiments, the baffle screw may further include a helical guide, which is a helical groove along the inner circumference of the discharge port, wherein the helical direction of the helical guide is opposite to the helical direction of the plurality of thread peaks. In some embodiments, the drive module may include: a main driver configured to convert electrical energy into kinetic energy including rotational force; and a plurality of branch drivers connected to the main driver and configured to receive the rotational force generated by the main driver, wherein the baffle module is one of a plurality of baffle modules in a water-cooling system. One end of a power transmission pin of each of the plurality of baffle modules may be coupled to a corresponding one of the plurality of branch drivers and configured to rotate by the rotational force generated by the main driver.

[0017] According to another aspect, an injection molding apparatus includes: one of the aforementioned water cooling systems; a molding die equipped with a cavity mold and a core, the cavity mold being configured to form the external shape of the injection-molded product, and the core being configured to form the internal shape of the injection-molded product; a gate, which is a channel for injecting molten raw material into a space defined between the cavity mold and the core; and an ejector configured to separate the injection-molded product from the molding die. Two or more water cooling systems may be provided in the molding die.

[0018] In some implementations, the mold is cooled uniformly and rapidly, which improves cooling efficiency and increases productivity by shortening the production cycle.

[0019] In some implementations, the temperature distribution inside the mold remains more uniform due to smoother cooling water circulation, which helps reduce product deformation and improve product surface quality.

[0020] In some implementations, the production precision of large, high-precision injection-molded products such as hydrogen tank liners can be improved, thereby facilitating the manufacture of hydrogen tanks with better airtightness and durability.

[0021] In some implementations, the production cost of the product can be reduced by shortening the cooling time and improving cooling efficiency.

[0022] The effects of this disclosure are not limited to those described above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. Attached Figure Description

[0023] The above and other aspects, features and advantages of this disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0024] Figure 1 This is a schematic view illustrating an example of an injection molding device.

[0025] Figure 2 This is a schematic cross-sectional view showing an example structure of a hydrogen tank installed in a hydrogen-powered vehicle.

[0026] Figure 3 This is a cross-sectional view showing an example of a water-cooled system.

[0027] Figure 4 This is a perspective view showing an example of a baffle module in a water-cooling system.

[0028] Figure 5 This is an exploded perspective view showing an example of a baffle module in a water-cooling system.

[0029] Figure 6 This is a cross-sectional view showing the baffle module in the water cooling system.

[0030] Figure 7 yes Figure 3 A magnified view of part A in the image.

[0031] Figure 8 yes Figure 3 A magnified view of part B in the image.

[0032] Figure 9 This is a cross-sectional view showing an example of the internal structure of a baffle screw in a water-cooling system.

[0033] Figure 10 This is a schematic view illustrating an example of the circulation path of cooling water in a water-cooling system, flowing between the inner circumference of the baffle screw and the cooling channel.

[0034] Figure 11 This is a block diagram illustrating an example of a drive module in a water-cooling system. Detailed Implementation

[0035] In the following, one or more embodiments of this disclosure will be described in detail with reference to the accompanying drawings.

[0036] In this disclosure, the first direction X, the second direction Y, and the third direction Z refer to the dimensions of the three-dimensional coordinate system used to represent the three-dimensional shape, and the directionality assigned to each dimension. Therefore, the first direction X, the second direction Y, and the third direction Z can be represented by arrows that intersect each other perpendicularly at a point in space.

[0037] Figure 1 This is a schematic view illustrating an example of injection molding equipment 1, and Figure 2 This is a schematic cross-sectional view showing an example of the structure of a hydrogen tank installed in a hydrogen-powered vehicle.

[0038] In some implementation schemes, such as Figure 1 As shown, injection molding equipment 1 can be used for the mass production of injection-molded products. For example, injection molding equipment 1 produces injection-molded products P by melting raw materials, injecting the molten raw materials into a molding die, and then cooling and solidifying the injected raw materials.

[0039] The injection molding equipment 1 may include an injection unit, a molding die, a gate 30, an ejector 40, and a cooling system 60.

[0040] In some examples, the injection unit may include: a hopper for storing and supplying raw materials; a heater for heating the raw materials and converting them into molten material R; and an injector for pushing the molten material R into a nozzle disposed in the molding die. The injection unit prepares the molten material R and injects the molten material R into the molding die.

[0041] The molding die can be made from multiple dies, such as a first die 22 and a second die 26.

[0042] Each mold can be movable or fixed.

[0043] Referring to the accompanying drawings, the first mold 22 may be provided with two laterally movable molds, and the first mold 22 is equipped with a cavity mold 24. The cavity mold 24, together with the base core 28, defines a predetermined space to form the exterior of the injection-molded product P.

[0044] Specifically, cavity mold 24 refers to the die that forms the outer part of the injection molded product P.

[0045] The base core 28 is installed in the second mold 26. The base core 28, together with the cavity mold 24, defines a predetermined space to form the exterior of the injection-molded product P.

[0046] Additionally, the base core 28 refers to the internal die that forms the injection molded product P.

[0047] The first mold 22 and / or the second mold 26 can be configured to be fixed or movable, respectively.

[0048] Additionally, a cooling channel 100 may be formed in each of the first mold 22 and / or the second mold 26, the cavity mold 24, and the base core 28.

[0049] The cooling channel 100 is a flow path formed in the first mold 22, the second mold 26, the cavity mold 24, and the base core 28, and is straight. One end of the cooling channel 100 is configured as a channel inlet facing the outside of the first mold 22, the second mold 26, the cavity mold 24, and the base core 28, and the other end of the cooling channel 100 extends straight from the channel inlet of each of the first mold 22, the second mold 26, the cavity mold 24, and the base core 28 toward the space where the injection-molded product P is placed. The other end of the cooling channel 100 is configured as a closed transition section located near the space where the injection-molded product P is placed.

[0050] The gate 30 is the path through which the molten material R passes through the molding die and the cavity mold 24 or through the molding die and the base core 28, and then flows into the predetermined space provided by the cavity mold 24 and the base core 28.

[0051] Ejector 40 may include multiple extraction pins 42 and extraction units 44, and ejector 40 will separate the injection molded product P from the cavity mold 24 and the base core 28 after cooling and solidification.

[0052] The extraction unit 44 is configured to move linearly, and as the extraction unit 44 moves, a plurality of extraction pins 42 can eject the injection-molded product P from the molding die and cavity mold 24 or from the molding die and base core 28.

[0053] The water cooling system 60 circulates cooling water through a cooling channel 100, which is formed in at least one of the first mold 22, the second mold 26, the cavity mold 24, and the base core 28. The water cooling system 60 cools the first mold 22, the second mold 26, the cavity mold 24, and the base core 28 near the cooling channel 100 by circulating cooling water.

[0054] In some implementations, multiple cooling channels 100 may be provided, and the first mold 22, the second mold 26, the cavity mold 24, the base core 28, etc., which can form the cooling channels 100 are collectively referred to as "forming molds".

[0055] like Figure 2 As shown, injection molding equipment 1 can be used to manufacture the liner 16 of hydrogen tank 10.

[0056] This is an exemplary example, and this disclosure can be implemented to manufacture various plastic injection molded products P, and the scope of this disclosure is not limited to the equipment used to manufacture the liner 16 of the hydrogen tank 10.

[0057] In short, the hydrogen tank 10 installed on a hydrogen-powered vehicle may include: an inner shell 18, which is configured to store hydrogen; an inner liner 16, configured to surround and protect the outer periphery of the inner shell 18; an outer shell 12, which defines a predetermined space with the inner liner 16 and is configured to surround and protect the exterior of the inner liner 16; and a reinforcing layer 14, which fills the space between the inner liner 16 and the outer shell 12 with a composite material.

[0058] The inner liner 16 is made of a material with excellent chemical stability and pressure resistance to prevent hydrogen from leaking to the outside.

[0059] In addition, as the size of the hydrogen tank 10 increases, the liner 16 used in the hydrogen tank 10 can also be manufactured in a larger size.

[0060] In some examples, relatively large molding dies are used to manufacture the liner 16 of a large hydrogen tank 10. In some cases, as the volume of the molding die increases, the cooling efficiency of the injection-molded product P decreases.

[0061] Therefore, the injection molding equipment 1 includes a water cooling system 60, which can shorten the production cycle and improve product quality even when manufacturing the liner 16 of the large hydrogen tank 10.

[0062] The water cooling system 60 will be described below.

[0063] Figure 3 This is a cross-sectional view showing the water cooling system 60. Figure 4 This is a perspective view showing the baffle module 400 in the water cooling system 60, and Figure 5 This is an exploded perspective view of the baffle module 400 in the water cooling system 60.

[0064] like Figures 3 to 5 As shown, the water cooling system 60 cools the mold by circulating cooling water inside the mold.

[0065] The molding die can be at least one of the first die 22, the second die 26, the cavity die 24, and the base core 28.

[0066] Therefore, the water cooling system 60 may include a cooling channel 100, a coolant supply pipe 110, a coolant recovery pipe 120, and a baffle module 400.

[0067] Cooling channel 100 is a series of paths through which cooling water can be supplied to the molding die.

[0068] Multiple cooling channels 100 can be set in the molding die, each with a different path.

[0069] Each cooling channel 100 has a channel inlet facing an external opening of the molding die, and each cooling channel 100 is provided in the molding die based on the space defined by the cavity mold 24 and the base core 28.

[0070] The channel inlet is the inlet of the channel formed by the cooling channel 100, wherein the cooling channel 100 is a channel formed in a straight line from the channel inlet and is formed as having a straight path from the channel inlet toward a predetermined space defined by the cavity mold 24 and the base core 28.

[0071] The cooling channel 100 has a closed structure at the other end opposite to the channel inlet. The closed end of the flow path is located near the space defined between the cavity mold 24 and the base core 28, and serves as a transition section in which the cooling water flowing into the cooling channel 100 has a significant impact on the cooling of the injection-molded product P.

[0072] The coolant supply pipe 110 is a channel for supplying cooling water, which has been cooled to a predetermined temperature by the heat exchanger 200, to the cooling channel 100.

[0073] The coolant recovery pipe 120 is a channel for recovering the cooling water that has flowed into the cooling channel 100. The cooling water recovered through the coolant recovery pipe 120 is supplied back to the heat exchanger 200 for cooling by the pump 300. The cooling water that has passed through the heat exchanger 200 can be reinjected into the cooling channel 100 through the coolant supply pipe 110.

[0074] In other words, the cooling water can be repeatedly circulated through the coolant recovery pipe 120, pump 300, heat exchanger 200, coolant supply pipe 110, and cooling channel 100.

[0075] Baffle modules 400 are installed in each cooling channel 100 formed inside the molding die.

[0076] The baffle module 400 divides the space within the cooling channel 100 and forms a circulation path for the cooling water to move within the cooling channel 100. In addition, the baffle module 400 makes the cooling water circulate more smoothly within the cooling channel 100.

[0077] Specifically, the baffle module 400 may include a drive module 500, a connecting housing 450, a power transmission pin 420, and a baffle screw 430.

[0078] The drive module 500 may be a drive motor 410 that converts electrical energy into kinetic energy, particularly rotational force. The drive motor 410 may include a drive shaft 412 rotatable in one direction at its center, and in response to the rotation of the drive shaft 412, the baffle screw 430 housed in the cooling channel 100 may rotate synchronously.

[0079] The connecting housing 450 is a disc-shaped component and can be connected to the channel inlet of the cooling channel 100 to close the cooling channel 100.

[0080] The connecting housing 450 isolates the space within the cooling channel 100 from the outside and prevents the cooling water circulating within the cooling channel 100 from leaking to the outside through the channel inlet.

[0081] The connecting housing 450 is fixed to the molding die that forms the channel inlet. Additionally, the connecting housing 450 may be provided with a pin hole 452 and a coolant connection path 454. The pin hole 452 and the coolant connection path 454 are openings formed in the connecting housing 450. The pin hole 452 and the coolant connection path 454 may be partially interconnected, or they may be separate holes.

[0082] The pin hole 452 is formed vertically at the center of the connecting housing 450.

[0083] In the space forming the pin through hole 452, the power transmission pin 420 can be arranged vertically through the space.

[0084] The lower end of the power transmission pin 420 is connected to the drive module 500 or the drive shaft 412, so that the power transmission pin 420 rotates synchronously in response to the rotation generated by the drive module 500.

[0085] A threaded connection structure can be provided on the outer periphery of the power transmission pin 420.

[0086] Furthermore, the power transmission pin 420 is installed in a manner that does not contact the pin through-hole 452 provided in the connecting housing 450. For this purpose, bearing members for reducing friction can be further provided between the connecting housing 450 and the drive module 500, and between the connecting housing 450 and the power transmission pin 420. The bearing members can be further provided in a suitable manner so that the construction of elements such as the fixed molding die, the inner circumference of the cooling channel 100, and the connecting housing 450 does not interfere with the construction of elements such as the power transmission pin 420 and the baffle screw 430, which rotate via the drive module 500.

[0087] Referring to the accompanying drawings, the power transmission pin 420 may have a cylindrical shape, extending along an imaginary straight line parallel to the Y-axis. Threads may be formed on the outer periphery of the power transmission pin 420, and an extended discharge path 422 may be provided therein as a vertical extension channel.

[0088] Extended discharge path 422 serves as a channel through which cooling water is discharged from the interior of cooling passage 100 to coolant recovery pipe 120.

[0089] At least a portion of the upper end (the other end) of the power transmission pin 420 passes through the pin through hole 452 and is received within the cooling channel 100. The upper end of the power transmission pin 420 can be connected to the lower end (one end) of the baffle screw 430, so that the rotational force generated by the drive module 500 can be transmitted to the baffle screw 430 through the power transmission pin 420.

[0090] Specifically, the upper end of the power transmission pin 420 can be connected to the lower end of the discharge hole 440, which is vertically formed inside the baffle screw 430 along the longitudinal direction (Y-axis direction) of the baffle screw 430.

[0091] The power transmission pin 420 and the baffle screw 430 can be cylindrical components extending along the Y-axis, and their centers can coincide. Furthermore, the power transmission pin 420 and the baffle screw 430 can rotate about the same axis of rotation.

[0092] Inside the baffle screw 430, an opening provided in the vertical direction forms a discharge hole 440, which serves as the flow path for cooling water discharged from the cooling channel 100 to the coolant recovery pipe 120.

[0093] The discharge port 440 and the extended discharge path 422 are arranged such that their respective flow paths are connected to each other.

[0094] The baffle screw 430 may have a thread peak 432 that helically protrudes along its outer circumference in one direction.

[0095] Thread valleys 434 are provided between the thread peaks 432 and the thread valleys 434 are relatively recessed.

[0096] In addition, a threaded contact surface 436 is provided on the outermost side of the thread peak 432. The threaded contact surface 436 is a helical surface that contacts the inner circumference of the cooling channel 100.

[0097] Therefore, inside the cooling channel 100, a cooling water supply path is spirally arranged along the threaded valley 434 formed on the outer periphery of the baffle screw 430. This cooling water supply path is the space defined between the baffle screw 430 and the inner periphery of the cooling channel 100.

[0098] Figure 6 This is a cross-sectional view of the baffle module 400 in the water cooling system 60. Figure 7 for Figure 3 A magnified view of part A in the image, and Figure 8 for Figure 3 A magnified view of part B in the image.

[0099] like Figures 6 to 8As shown, the power transmission pin 420 and the baffle screw 430 can be rotated by the drive module 500 around a rotation axis parallel to the Y-axis.

[0100] When the baffle screw 430 rotates inside the cooling channel 100, the cooling water moves along the inclined path set by the thread peaks 432 and thread valleys 434.

[0101] In some embodiments, referring to the accompanying drawings, the baffle screw 430 rotates clockwise, and the cooling water flowing into the space between the baffle screw 430 and the inner circumference of the cooling channel 100 rotates and rises along the +Y axis direction.

[0102] One end of the coolant connection path 454, located within the connecting housing 450, can be connected to the coolant supply pipe 110, while the other end can be located within the cooling channel 100. As the baffle screw 430 rotates, the cooling water flowing into the cooling channel 100 through the coolant connection path 454 rises along the threaded valley 434 formed on the outer periphery of the baffle screw 430 when the baffle screw 430 rotates in the opposite direction.

[0103] like Figure 7 As shown, in the transition section located near the injection-molded product P within the cooling channel 100, the flow of cooling water rising along the threaded valley 434 is redirected. In the transition section, the cooling water flows into the discharge hole 440 formed at the center of the baffle screw 430.

[0104] Cooling water flows from the transition section into the drain hole 440 and is discharged to the outside of the cooling passage 100 via the drain hole 440 and the extended drain path 422. The cooling water is then collected in the coolant recovery pipe 120 through a separately configured path.

[0105] Figure 9 This is a cross-sectional view showing the internal structure of the baffle screw 430 in the water cooling system 60, and Figure 10 This is a schematic view showing the circulation path of cooling water flow between the baffle screw 430 and the inner periphery of the cooling channel 100 in the water cooling system 60.

[0106] like Figure 9 As shown, a spiral guide 442 that rotates spirally can be provided on the inner circumference of the discharge hole 440.

[0107] The spiral guide 442 is formed to be inclined in a spiral shape in the opposite direction to the inclined surface formed by the threaded valley 434.

[0108] In some examples, the spiral guide 442 may be configured as an elongated spiral groove (or convex wall) formed as a path that spirals along a vertical, elongated circular channel formed by the discharge hole 440.

[0109] like Figure 10 As shown, the cooling water supplied to the cooling channel 100 can rise to the transition section as the thread valley 434 of the baffle screw 430 rotates counterclockwise, and in the transition section, the cooling water flowing into the discharge hole 440 at the upper end of the baffle screw 430 can be discharged through the spiral guide 442 as the screw rotates clockwise.

[0110] The baffle screw 430 forms a predetermined cooling water circulation path in the space within the cooling channel 100, and makes the cooling water moving along this circulation path circulate more smoothly.

[0111] In some implementations, the vertical thickness of the threaded valley 434 formed on the outer periphery of the baffle screw 430 gradually decreases from the lower end of the baffle screw 430 toward the transition section. That is, the width of the threaded valley 434 gradually increases toward the transition section.

[0112] Since the flow rate of cooling water supplied at the same flow rate is inversely proportional to the cross-sectional area of ​​the channel through which the cooling water flows, this can lead to an increase in the movement speed of the cooling water at a location relatively far from the transition section.

[0113] Figure 11 This is a block diagram showing the drive module 500 in the water cooling system 60.

[0114] like Figure 11 As shown, the drive module 500 in the water cooling system 60 can be implemented as a drive motor 410 equipped with a rotating shaft as described above. In some examples, the drive module 500 can be constructed using multiple branch drivers 520, which are physically connected to a single main driver 510.

[0115] The main drive 510 can convert electrical energy into rotational energy, and multiple branch drives 520 can be connected to the main drive 510 via a structure that can transmit physical force, such as a gearbox.

[0116] In other words, multiple branch drives 520 can be rotated via a single main drive 510. Alternatively, when multiple baffle modules 400 are provided, each power transmission pin 420 can be physically connected to the branch drive 520 outside the corresponding cooling channel 100 through a pin hole 452 provided in the coupling housing 450.

[0117] It will be apparent to those skilled in the art that modifications can be made to this disclosure within the scope of the disclosed technical concept. The described embodiments should be considered part of this disclosure, and the scope of this disclosure should not be determined solely by the described embodiments.

[0118] The scope of this disclosure should be determined based on the technical concept described in the claims. Furthermore, even if the operation or effect based on the construction is not explicitly described in the description of embodiments of this disclosure, it is obvious that predictable operation or effect based on the corresponding construction should naturally be considered part of this disclosure.

Claims

1. A water cooling system for an injection molding apparatus, the water cooling system circulating cooling water to cool the molding die, the water cooling system comprising: A cooling channel defines a straight flow path within the molding die, the cooling channel having: a first end defining a channel inlet opening toward the outside of the molding die; and a second end defining a transition section and being the closed end of the straight flow path extending toward the injection-molded product through at least a portion of the interior of the molding die. A coolant supply pipe supplies the cooling water to the cooling channel; A coolant recovery pipe receives the cooling water from the cooling passage; as well as A baffle module, at least partially housed within the cooling channel and defining a circulation path within the cooling channel, causes cooling water introduced through the coolant supply pipe to move along the circulation path and discharges the cooling water to the coolant recovery pipe. The baffle module includes a baffle screw, which has a cylindrical shape and is housed within the cooling channel along a straight flow path. The baffle screw includes multiple threaded peaks protruding from its outer periphery in an inclined direction. The baffle screw rotates within the cooling channel, thereby causing the cooling water to move along a predetermined path.

2. The water cooling system according to claim 1, wherein, The baffle screw further includes: A threaded contact surface defines a curved surface that extends helically along the outermost periphery of the plurality of thread peaks, the threaded contact surface contacting the inner periphery of the cooling channel; and The threaded valley is a groove defined between the plurality of threaded peaks, and the threaded valley defines a helical flow path between the baffle screw and the inner circumference of the cooling channel.

3. The water cooling system according to claim 1, wherein, The baffle screw defines a discharge hole within itself, the discharge hole extending along the longitudinal direction of the baffle screw, and The discharge port provides a flow path that connects the opposite ends of the baffle screw to each other.

4. The water cooling system according to claim 3, further comprising: The drive module, located outside the cooling channel, generates rotational force. The baffle module further includes: The connecting housing closes the channel inlet, and the connecting housing defines the pin through-hole and coolant connection path; and The power transmission pin includes a first end and a second end. The first end is connected to the drive module, and the second end passes through the pin through hole and is connected to the baffle screw housed in the cooling channel. The power transmission pin transmits rotational force from the drive module to the baffle screw.

5. The water cooling system according to claim 4, wherein, The power transmission pin defines an extended discharge path within the power transmission pin along the longitudinal direction, and The second end of the power transmission pin is connected to the end of the baffle screw facing the outside of the cooling channel, and the extended discharge path is connected to the discharge hole of the baffle screw.

6. The water cooling system according to claim 4, wherein, The coolant connection path is connected to the coolant supply pipe and guides the cooling water supplied from the coolant supply pipe into the cooling channel.

7. The water cooling system according to claim 4, wherein, The baffle screw further includes a helical guide, which is a helical groove along the inner circumference of the discharge hole, and The helical direction of the helical guide is opposite to the helical direction of the plurality of thread peaks.

8. The water cooling system according to claim 4, wherein, The driving module includes: The main drive converts electrical energy into kinetic energy, including the rotational force; and Multiple branch drivers are connected to the main driver and receive rotational force generated by the main driver. The baffle module is one of multiple baffle modules in the water cooling system, and One end of the power transmission pin of each of the plurality of baffle modules is connected to a corresponding one of the plurality of branch drivers and rotates by the rotational force generated by the main driver.

9. The water cooling system according to claim 1, wherein, The injection molding equipment includes: Multiple water cooling systems are disposed in the molding die and include the water cooling systems; The molding die includes a cavity mold and a base core. The cavity mold forms the external shape of the injection molded product, and the base core forms the internal shape of the injection molded product. A gate, defining a channel for receiving molten raw material, which is injected into a space defined between the cavity mold and the base core; and An ejector separates the injection-molded product from the molding die.

10. An injection molding apparatus, comprising: A molding die includes a cavity mold and a base core, wherein the cavity mold forms the external shape of the injection-molded product and the base core forms the internal shape of the injection-molded product; A gate defines a channel for receiving molten raw material, which is injected into the space defined between the cavity mold and the base core; An ejector separates the injection-molded product from the molding die; as well as Multiple water cooling systems are disposed in the molding die, each of the multiple water cooling systems comprising: A cooling channel defines a straight flow path within the molding die, the cooling channel having: a first end defining a channel inlet opening toward the outside of the molding die; and a second end defining a transition section and being the closed end of the straight flow path extending toward the injection-molded product through at least a portion of the interior of the molding die. A coolant supply pipe supplies the cooling water to the cooling channel; Coolant recovery pipe, receiving the cooling water from the cooling passage; and A baffle module, at least partially housed within the cooling channel and defining a circulation path within the cooling channel, causes cooling water introduced through the coolant supply pipe to move along the circulation path and discharges the cooling water to the coolant recovery pipe. The baffle module includes a baffle screw, which has a cylindrical shape and is housed within the cooling channel along a straight flow path. The baffle screw includes multiple threaded peaks protruding from its outer periphery in an inclined direction. The baffle screw rotates within the cooling channel, thereby causing the cooling water to move along a predetermined path.

11. The injection molding apparatus according to claim 10, wherein, The baffle screw further includes: A threaded contact surface defines a curved surface that extends helically along the outermost periphery of the plurality of thread peaks, the threaded contact surface contacting the inner periphery of the cooling channel; and The threaded valley is a groove defined between the plurality of threaded peaks, and the threaded valley defines a helical flow path between the baffle screw and the inner circumference of the cooling channel.

12. The injection molding equipment according to claim 10, wherein, The baffle screw defines a discharge hole within itself, the discharge hole extending along the longitudinal direction of the baffle screw, and The discharge port provides a flow path that connects the opposite ends of the baffle screw to each other.

13. The injection molding apparatus according to claim 12, further comprising: The drive module, located outside the cooling channel, generates rotational force. The baffle module further includes: The connecting housing closes the channel inlet, and the connecting housing defines the pin through-hole and coolant connection path; and The power transmission pin includes a first end and a second end. The first end is connected to the drive module, and the second end passes through the pin through hole and is connected to the baffle screw housed in the cooling channel. The power transmission pin transmits rotational force from the drive module to the baffle screw.

14. The injection molding equipment according to claim 13, wherein, The power transmission pin defines an extended discharge path within the power transmission pin along the longitudinal direction, and The second end of the power transmission pin is connected to the end of the baffle screw facing the outside of the cooling channel, and the extended discharge path is connected to the discharge port of the baffle screw for fluid.

15. The injection molding equipment according to claim 13, wherein, The coolant connection path is connected to the coolant supply pipe and guides the cooling water supplied from the coolant supply pipe into the cooling channel.

16. The injection molding apparatus according to claim 13, wherein, The baffle screw further includes a helical guide, which is a helical groove along the inner circumference of the discharge hole, and The helical direction of the helical guide is opposite to the helical direction of the plurality of thread peaks.

17. The injection molding equipment according to claim 13, wherein, The driving module includes: The main drive converts electrical energy into kinetic energy, including the rotational force; and Multiple branch drivers are connected to the main driver and receive the rotational force generated by the main driver. One end of the power transmission pin of each of the plurality of baffle modules is connected to a corresponding one of the plurality of branch drivers and rotates by the rotational force generated by the main driver.

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