Water cooling structure of injection mold

Abstract

This utility model discloses a water-cooling structure for injection molds, including an upper mold base and a lower mold base. Mold cores are installed at the bottom of the upper mold base and the top of the lower mold base, forming a cavity. Each mold core has a mounting groove at its opposite end, with the bottom contour of the two mounting grooves matching the contour shape of the corresponding side cavity. The internal structures of the two mounting grooves are identical, and the bottom of the mounting grooves has a downward-recessed S-shaped flow channel. Each mold core has an inlet pipe and an outlet pipe. The inlet pipe is connected to one end of the S-shaped flow channel in the corresponding mold core, and the outlet pipe is connected to the other end of the S-shaped flow channel in the corresponding mold core. Both the inlet and outlet pipes are connected to an external water circulation device. This utility model uses an external water circulation device to transport coolant through the inlet pipe to the S-shaped flow channel within the mold core. As the coolant flows through the flow channel, it dissipates heat from the mold core through convection heat exchange, achieving rapid cooling of the product. The flow channel is designed to conform to the curved surface of the cavity, resulting in a short heat transfer distance and high heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a water-cooling structure for injection molds. Background Technology

[0002] Injection molds are key process equipment used for molding plastic products. During the injection molding process, molten plastic is injected into the mold cavity under high pressure, and after cooling and solidification, it forms a plastic product of the desired shape. In order to improve production efficiency and product quality, the mold is usually designed with a water-cooling structure. The coolant in the water-cooling structure carries away the heat released when the plastic solidifies, allowing the product to cool down and solidify quickly.

[0003] However, traditional water-cooling structures are usually composed of multiple straight-hole pipes connected in series or in parallel through plugs, connectors, etc. However, when dealing with products with large curved surfaces, such water-cooling structures are often difficult to fit the surface evenly, resulting in poor product cooling effect. Utility Model Content

[0004] The purpose of this invention is to provide a water-cooling structure for injection molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A water-cooled structure for an injection mold includes an upper mold base and a lower mold base. A mold core is mounted on the bottom of the upper mold base and the top of the lower mold base. The two mold cores fit together to form a cavity. Each mold core has a mounting groove at an opposite end. The bottom contour of the two mounting grooves matches the contour shape of the corresponding side cavity. The internal structure of the two mounting grooves is identical. The bottom of each mounting groove has a downwardly recessed S-shaped flow channel. Each mold core has an inlet pipe and an outlet pipe. The inlet pipe is connected to one end of the S-shaped flow channel in the corresponding mold core, and the outlet pipe is connected to the other end of the S-shaped flow channel in the corresponding mold core. Both the inlet and outlet pipes are connected to an external water circulation device. A sealing cap that fits snugly against the bottom of the mounting groove is mounted on the top of the mounting groove to seal the S-shaped flow channel.

[0006] Furthermore, both mold cores are provided with outer annular grooves at the top of the mounting grooves, and cover plates are placed on both outer annular grooves. The two cover plates are integrally formed with their corresponding sealing caps. Both outer annular grooves are provided with annular grooves, and sealing gaskets are placed in the annular grooves. One end of the sealing gasket protrudes outside the annular groove and abuts against the cover plate.

[0007] Furthermore, the S-shaped flow channel is provided with a few interfering flow columns.

[0008] Furthermore, each of the aforementioned turbulence columns has helical fins on its sidewalls, and the helical fins extend axially in a helical manner along the turbulence column.

[0009] Furthermore, the S-shaped flow channel is divided into multiple direct flow channels and multiple edge flow channels, and a turbulence channel is connected between any two adjacent direct flow channels.

[0010] Furthermore, the cross-section of the turbulence channel is designed in a V-shape.

[0011] The beneficial effects of this utility model are: This invention outputs coolant through an external water circulation device. The coolant enters the S-shaped flow channel of the mold core through the inlet pipe. Because the S-shaped flow channel is designed to adapt to the curved shape of the cavity, the heat transfer distance between the S-shaped flow channel and the cavity is minimized. When the molten plastic is injected into the cavity, the mold core absorbs the heat of the plastic, while the continuously flowing coolant carries away the heat from the mold core through convection heat transfer, thereby achieving a rapid cooling effect. After heat exchange, the heated coolant returns to the external water circulation device through the outlet pipe. After being cooled by the external water circulation device, it is pumped back into the mold core, forming a continuous and stable cooling cycle, ensuring the molding cycle and product quality.

[0012] Because both the upper and lower mold cores are equipped with S-shaped flow channels with the same structure, this utility model can cool the upper and lower surfaces of the product simultaneously, achieving uniform heat dissipation as a whole.

[0013] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0014] Figure 1 The overall structure of this utility model Figure 1 .

[0015] Figure 2 The overall structure of this utility model Figure 2 .

[0016] Figure 3 The explosion of this utility model Figure 1 .

[0017] Figure 4 The explosion of this utility model Figure 2 .

[0018] Figure 5 : Exploded view of part of the structure of this utility model.

[0019] Figure 6 : Internal structure diagram of the mounting slot of this utility model.

[0020] Figure 7 : Structural diagram of the sealing cap and cover plate of this utility model.

[0021] Figure 8 : A cross-sectional view of this utility model.

[0022] Figure 9 : Structural diagram of one embodiment of this utility model.

[0023] Figure 10 : Figure 9 Enlarged view of the structure of part A.

[0024] Figure 11 : Structural diagram of embodiment two of this utility model.

[0025] Reference numerals in the attached drawings: 1. Upper mold base; 2. Lower mold base; 3. Mold core; 4. Cavity; 5. Mounting groove; 6. S-shaped flow channel; 7. Inlet pipe; 8. Outlet pipe; 9. Sealing cap; 31. Outer ring groove; 32. Annular groove; 33. Sealing gasket; 61. Baffle column; 62. Spiral fin; 63. Baffle channel; 91. Cover plate. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] Please refer to Figure 1-11 ; A water-cooling structure for an injection mold includes an upper mold base 1 and a lower mold base 2. Mold cores 3 are mounted on the bottom of the upper mold base 1 and the top of the lower mold base 2. When the mold is closed, the two mold cores 3 fit together to form a cavity 4 for product molding. Each mold core 3 has a mounting groove 5 at its opposite end, specifically located on the side of the corresponding mold core 3 facing away from the cavity 4. The bottom contour of the two mounting grooves 5 matches the contour shape of the corresponding side cavity 4; that is, the bottom contour of the mounting groove 5 of the lower mold core 3 matches the bottom contour of the cavity 4, and the bottom contour of the mounting groove 5 of the upper mold core 3 matches the top contour of the cavity 4. The internal structure of the two mounting grooves 5 is identical. The bottom of the mounting groove 5 has a downwardly recessed S-shaped flow channel 6. The S-shaped flow channel 6 is adaptively designed based on the curved surface shape of the cavity 4, and its direction is consistent with the contour of the cavity 4. This conformal design minimizes the heat transfer distance between the S-shaped flow channel 6 and the cavity 4, thus improving cooling efficiency. Both mold cores 3 are equipped with inlet pipes 7 and outlet pipes 8. The inlet pipe 7 is connected to one end of the S-shaped flow channel 6 in the corresponding mold core 3, and the outlet pipe 8 is connected to the other end of the S-shaped flow channel 6 in the corresponding mold core 3. Both the inlet pipe 7 and the outlet pipe 8 are connected to an external water circulation device (not shown in the figure) to form a cooling circuit. A sealing cover 9 is installed on the top of the mounting groove 5, and its bottom fits against the bottom of the mounting groove 5 to seal the S-shaped flow channel 6 and prevent coolant leakage.

[0028] Working Principle: Before injecting high-temperature molten plastic into the cavity 4, the external water circulation device is activated. Coolant is output from the external water circulation device and enters the S-shaped flow channel 6 of the mold core 3 through the inlet pipe 7. Because the S-shaped flow channel 6 is designed to conform to the curved surface of the cavity 4, the heat transfer distance between the S-shaped flow channel 6 and the cavity 4 is minimized. When the molten plastic is injected into the cavity 4, the mold core 3 absorbs the heat from the plastic, while the continuously flowing coolant carries away the heat from the mold core 3 through convection heat transfer, thus achieving rapid cooling. After heat exchange, the heated coolant returns to the external water circulation device through the outlet pipe 8, is cooled by the external water circulation device, and is then pumped back into the mold core 3, forming a continuous and stable cooling cycle to ensure molding cycle and product quality. Since both the upper and lower mold cores 3 have identical S-shaped flow channels 6, the upper and lower surfaces of the product can be cooled simultaneously, achieving uniform heat dissipation.

[0029] In this embodiment, both mold cores 3 are provided with outer annular grooves 31 at the top of the mounting grooves 5, and cover plates 91 are placed on both outer annular grooves 31. The two cover plates 91 are integrally formed with the corresponding sealing covers 9. At the same time, both outer annular grooves 31 are provided with annular grooves 32, and sealing gaskets 33 are placed in the annular grooves 32. One end of the sealing gasket 33 protrudes outside the annular groove 32 and abuts against the cover plate 91. When the cover plate 91 is installed in place, it applies pressure to the sealing gasket 33, causing the sealing gasket 33 to compress and deform, thereby forming a sealed connection between the cover plate 91 and the outer annular grooves 31, preventing coolant leakage and ensuring the sealing effect.

[0030] To further enhance the heat transfer efficiency of the coolant within the flow channel, this application provides two optimized implementation methods: Implementation Method 1: A minor turbulence column 61 is provided within the S-shaped flow channel 6. The minor turbulence column 61 is positioned along the extension direction of the S-shaped flow channel 6 and located on the flow path of the coolant. When the coolant flows through the S-shaped flow channel 6, it is blocked by the turbulence column 61, causing a change in flow direction, generating local eddies and turbulence effects, disrupting the fluid boundary layer, and increasing the convective heat transfer coefficient between the fluid and the flow channel wall. The cross-section of the turbulence column 61 can be designed in various forms such as circular, elliptical, or conical; this application preferably adopts a cylindrical structure. In addition, spiral fins 62 are provided on the sidewalls of the minor turbulence column 61. The spiral fins 62 extend axially spirally along the turbulence column 61. When the coolant flows through, the spiral fins 62 guide the fluid to generate rotational motion, forming strong spiral turbulence, further breaking the thermal boundary layer, enhancing the mixing effect inside the fluid, and improving the wall heat transfer capacity. The spiral fins 62 and the turbulence column 61 are integrally formed to ensure structural strength and durability.

[0031] Implementation Method 2: The S-shaped flow channel 6 is divided into multiple direct-flow channels and multiple edge channels. A turbulence channel 63 connects any two adjacent direct-flow channels. The inlet inclination direction of the turbulence channel 63 is consistent with the water flow direction. The turbulence channel 63 is used to enhance heat exchange. The cross-section of the turbulence channel 63 is V-shaped, which can form vortices within the channel, promoting mixing between the liquid in the direct-flow channels and the liquid in the turbulence channel, thereby improving the overall heat exchange performance.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A water-cooled structure for an injection mold, comprising an upper mold base (1) and a lower mold base (2), wherein mold cores (3) are mounted on the bottom of the upper mold base (1) and the top of the lower mold base (2), and the two mold cores (3) are fitted together to form a cavity (4), characterized in that, Each of the two mold cores (3) has an installation groove (5) at one opposite end. The bottom contour of the two installation grooves (5) matches the contour shape of the corresponding side cavity (4). The internal structure of the two installation grooves (5) is the same. The bottom of the installation groove (5) is provided with a downwardly recessed S-shaped flow channel (6). Each of the two mold cores (3) is provided with a water inlet pipe (7) and a water outlet pipe (8). The water inlet pipe (7) is connected to one end of the S-shaped flow channel (6) in the corresponding mold core (3). The water outlet pipe (8) is connected to the other end of the S-shaped flow channel (6) in the corresponding mold core (3). The water inlet pipe (7) and the water outlet pipe (8) are both connected to an external water circulation device. The top of the installation groove (5) is equipped with a sealing cap (9) that fits the bottom of the installation groove (5) to block the S-shaped flow channel (6).

2. The water cooling structure of an injection mold according to claim 1, wherein Both of the mold cores (3) are provided with outer ring grooves (31) at the top of the mounting groove (5). Both outer ring grooves (31) are provided with cover plates (91). The two cover plates (91) are integrally formed with the corresponding sealing caps (9). Both outer ring grooves (31) are provided with annular grooves (32). A sealing gasket (33) is placed in the annular groove (32). One end of the sealing gasket (33) protrudes outside the annular groove (32) and abuts against the cover plate (91).

3. The water cooling structure of an injection mold according to claim 1, wherein The S-shaped flow channel (6) is provided with a minor interference flow column (61).

4. The water cooling structure of an injection mold according to claim 3, wherein The sidewalls of several of the aforementioned turbulence columns (61) are provided with helical fins (62), which extend axially in a spiral shape along the turbulence column (61).

5. The water cooling structure of injection mold according to claim 1, wherein, The S-shaped flow channel (6) is divided into multiple direct flow channels and multiple edge flow channels, and a turbulence channel (63) is connected between any two adjacent direct flow channels.

6. The water cooling structure of an injection mold according to claim 5, wherein The cross-section of the turbulence channel (63) is V-shaped.

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