A cooling water jacket structure

Abstract

This utility model discloses a cooling water jacket structure, including an inner bushing with a first through-cavity cavity; an outer bushing connected to a mold, having a second cavity, an inlet, and an outlet; the inner bushing is installed in the second cavity, and its outer wall surface has a first groove and a second groove, the first groove communicating with the inlet and the second groove communicating with the outlet; a connecting space for water flow is provided between the bottom of the inner bushing and the second cavity, the connecting space being located near the constriction section; the first groove extends vertically downward from the inlet to the connecting space, and the second groove extends vertically downward from the outlet to the connecting space, forming a water channel. This utility model effectively reduces the temperature near the outlet of the hot nozzle, preventing plastic stringing caused by continuous melt flow due to overheating, and ensuring product demolding quality.

Description

Technical Field

[0001] This utility model relates to the technical field of hot runners for molds, and in particular to a cooling water jacket structure. Background Technology

[0002] Currently, when demolding plastic products, it is not necessary to remove the sprue from the runner. Since the plastic in the runner has not solidified, the runner remains unobstructed during the next injection. However, the outlet of the hot runner nozzle (i.e., the lower end of the nozzle core) often has the problem of excessively high temperature. If the temperature at the outlet of the hot nozzle cannot be cooled down in time, plastic stringing will occur, affecting the quality of plastic products and production efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cooling water jacket structure that can reduce the temperature at the hot runner nozzle outlet.

[0004] This utility model is implemented according to the following technical solution:

[0005] This utility model discloses a cooling water jacket structure, including:

[0006] An inner bushing having a first receiving cavity extending vertically through it, the first receiving cavity being used to install a hot nozzle;

[0007] An outer bushing is installed and connected to the mold. The outer bushing has a second receiving cavity, a water inlet, and a water outlet. The second receiving cavity extends vertically and has a diameter reduction portion at its bottom that matches the shape of the bottom of the hot nozzle. The water inlet and the water outlet are respectively connected to an external pipe.

[0008] The inner bushing is installed in the second receiving cavity, and the outer wall surface of the inner bushing abuts against the wall surface of the second receiving cavity. A first groove and a second groove are provided on the outer wall surface of the inner bushing. The first groove communicates with the water inlet, and the second groove communicates with the water outlet. There is a connecting space between the bottom of the inner bushing and the second receiving cavity for water to flow through. The connecting space is located near the constriction portion. The first groove extends vertically downward from the water inlet to the connecting space, and the second groove extends vertically downward from the water outlet to the connecting space. The connecting space, the first groove, and the second groove together constitute a water transport channel.

[0009] Compared with existing technologies, in this invention, cooling water flows vertically downwards into the connecting space through the first groove on the outer wall of the inner bushing. After forming a cooling loop through the connecting space, it flows vertically upwards through the second groove, forming a closed-loop cooling path around the bottom of the hot nozzle. This design directly acts on the high-temperature area, effectively reducing the temperature near the outlet of the hot nozzle, avoiding plastic stringing caused by continuous flow of overheated melt, and ensuring the quality of product demolding.

[0010] In a preferred embodiment, the inlet and the outlet are set at the same height and are both located at the top of the water transport channel.

[0011] In a preferred embodiment, the inlet and the outlet are positioned 180° apart.

[0012] In a preferred embodiment, both the inlet and the outlet have a vertical section and a horizontal section that are connected; the external pipe is connected to the vertical section; and the water transport channel is connected to the horizontal section.

[0013] In a preferred embodiment, the outer wall surface of the inner bushing abuts against the wall surface of the second receiving cavity.

[0014] In a preferred embodiment, a first groove and a second groove are provided on the outer wall surface of the inner bushing. The first groove communicates with the water inlet, and the second groove communicates with the water outlet. There is a connecting space between the bottom of the inner bushing and the second receiving cavity for water to flow through. The first groove extends vertically downward from the water inlet to the connecting space, and the second groove extends vertically downward from the water outlet to the connecting space. The connecting space, the first groove, and the second groove together constitute the water transport channel.

[0015] In a preferred embodiment, the inner bushing and the outer bushing are fitted with an upper sealing ring and a lower sealing ring; the water channel is located in the area between the upper sealing ring and the lower sealing ring.

[0016] In a preferred embodiment, the top of the first receiving cavity has a stepped hole that is wider at the top and narrower at the bottom. The stepped hole has a first step portion and a second step portion from top to bottom. The first step portion is used to support the inner bushing. The inner bushing has a shoulder portion. The shoulder portion and the second step portion form a first annular groove. The upper sealing ring is installed at the first annular groove.

[0017] In a preferred embodiment, the second receiving cavity has a bottom plane, and the radially contracted portion transitions through the bottom plane and is connected to the side wall of the second receiving cavity; the bottom of the inner bushing has a second annular groove, the second annular groove abuts against the second receiving cavity, and the lower sealing ring is installed at the second annular groove. Attached Figure Description

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a cross-sectional view of the cooling water jacket structure of this utility model;

[0020] Figure 2 This is an exploded view of the cooling water jacket structure of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100 Inner bushing, 110 First receiving cavity, 120 First groove, 130 Second groove, 140 Shoulder, 200 Outer bushing, 210 Second receiving cavity, 211 Reduction section, 212 First step section, 213 Second step section, 214 Bottom plane, 220 Inlet, 230 Outlet, 300 Connecting space, 400 Vertical section, 500 Horizontal section, 600 First annular groove, 700 Second annular groove. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0026] See Figure 1 and Figure 2 This utility model discloses a cooling water jacket structure, comprising:

[0027] The inner bushing 100 has a first receiving cavity 110 that extends vertically through it, and the first receiving cavity 110 is used to install a hot nozzle.

[0028] An outer bushing 200 is installed and connected to the mold. The outer bushing 200 has a second receiving cavity 210, a water inlet 220 and a water outlet 230. The second receiving cavity 210 extends vertically and has a diameter reduction portion 211 at its bottom that is adapted to the shape of the bottom of the hot nozzle. The water inlet 220 and the water outlet 230 are respectively connected to an external pipe.

[0029] The outer wall of the inner bushing 100 abuts against the wall of the second receiving cavity 210. A first groove 120 and a second groove 130 are provided on the outer wall of the inner bushing 100. The first groove 120 communicates with the water inlet 220, and the second groove 130 communicates with the water outlet 230. There is a connecting space 300 between the bottom of the inner bushing 100 and the second receiving cavity 210 for water to flow through. The connecting space 300 is located near the constriction portion 211. The first groove 120 extends vertically downward from the water inlet 220 to the connecting space 300, and the second groove 130 extends vertically downward from the water outlet 230 to the connecting space 300. The connecting space 300, the first groove 120, and the second groove 130 together constitute a water transport channel.

[0030] Compared with the prior art, in this utility model, cooling water flows vertically downward into the connecting space 300 through the first groove 120 on the outer wall of the inner bushing 100. After forming a cooling loop through the connecting space 300, it flows vertically upward through the second groove 130, forming a closed-loop cooling path around the bottom of the hot nozzle. This design directly acts on the high-temperature area, effectively reducing the temperature of the hot nozzle near its outlet, avoiding the phenomenon of plastic stringing caused by continuous flow due to overheating of the melt, and ensuring the demolding quality of the product.

[0031] In one embodiment, the inlet 220 and the outlet 230 are set at the same height and are both located at the top of the water transport channel, forming a top-in and top-out water flow pattern. This design enables the cooling water to quickly fill the entire water transport channel under the combined effect of gravity and pumping pressure. The design of the inlet 220 and outlet 230 at the same top height makes the connection with the external cooling pipe simpler and more direct. The external pipe can be connected on the same plane at the top of the mold, avoiding the complex pipe layout and bends caused by the height difference between the inlet and outlet 230.

[0032] In one embodiment, the inlet 220 and the outlet 230 are positioned 180° apart. A symmetrical water flow path is formed within the water channel (especially the connecting space 300). Low-temperature cooling water flows vertically downwards from the inlet 220 along the first groove 120 into the connecting space 300, where it is evenly distributed circumferentially, forming a 360° circumferential flow around the bottom of the hot nozzle, and then flows vertically upwards from the second groove 130 at a symmetrical 180° position. This symmetrical layout avoids the water flow bias caused by asymmetrical inlets (such as those spaced 45° or 90° apart), ensuring consistent flow rate and velocity of the cooling water in all circumferential areas at the bottom of the nozzle. This reduces the problem of insufficient cooling in certain areas due to uneven water flow distribution and effectively solves the potential problems of inconsistent plastic melt solidification speed and localized overheating and stringing caused by circumferential temperature differences at the outlet of the hot nozzle assembly.

[0033] In one embodiment, both the inlet 220 and the outlet 230 have a vertical section 400 and a horizontal section 500 that are connected; the external pipe is connected to the vertical section 400; and the water transport channel is connected to the horizontal section 500. Since the inlet 220 and the outlet 230 are distributed on the outer bushing 200, and the outer bushing 200 needs to be fitted into the mold, the structure of the inlet 220 and the outlet 230 is designed and processed in two sections. Compared to a straight-through oblique machining design, the two-section machining design only requires simple through-hole machining, without the need for additional special tooling to fix the outer bushing 200 at a specific angle before machining.

[0034] In one embodiment, the inner bushing 100 and the outer bushing 200 are fitted with an upper sealing ring and a lower sealing ring; the water channel is located in the area between the upper sealing ring and the lower sealing ring, which tightly seals the water channel in the middle area, forming a sandwich sealing structure. This design clearly defines the scope of the cooling water path in space, preventing the cooling water from spreading to the upper and lower ends due to the gap between the inner bushing 100 and the outer bushing 200, blocking the risk of leakage, and ensuring that the cooling water only circulates internally in the preset water channel.

[0035] Furthermore, the top of the first receiving cavity 110 has a stepped hole that is wider at the top and narrower at the bottom. The stepped hole has a first step portion 212 and a second step portion 213 from top to bottom. The first step portion 212 is used to support the inner bushing 100. The inner bushing 100 has a shoulder portion 140. The shoulder portion 140 and the second step portion 213 form a first annular groove 600. The upper sealing ring is installed at the first annular groove 600. The structured design of the first annular groove 600 eliminates the need for complex tooling when installing the upper sealing ring. During assembly, simply place the upper sealing ring on the shoulder 140 of the inner bushing 100 and then insert the inner bushing 100 into the outer bushing 200 to complete the installation. The upper sealing ring will automatically be positioned in the first annular groove 600. The entire process does not require adjusting the position of the sealing ring, significantly reducing the reliance on the skills of the assembly personnel. Furthermore, the first annular groove 600 forms a precisely sized annular installation area. The width and depth of this area are highly matched with the cross-sectional specifications of the upper sealing ring, creating a stable installation space and preventing the upper sealing ring from shifting.

[0036] Furthermore, the second receiving cavity 210 has a bottom plane 214, through which the radially reduced portion 211 transitions and connects to the side wall of the second receiving cavity 210; the bottom of the inner bushing 100 has a second annular groove 700, which abuts against the second receiving cavity 210, and the lower sealing ring is installed in the second annular groove 700. The structured design of the second annular groove 700 eliminates the need for special tooling for assembling the lower sealing ring. Simply place the lower sealing ring into the second annular groove 700 and then insert the inner bushing 100 into the second receiving cavity 210 of the outer bushing 200, simplifying the assembly process; moreover, the second annular groove 700 forms a precisely sized annular installation area, the width and depth of which are highly matched to the cross-sectional specifications of the lower sealing ring, creating a stable installation space and preventing displacement of the lower sealing ring.

[0037] It should be noted that, Figure 1 The direction of the middle arrow indicates the direction of cooling water flow.

[0038] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A cooling water jacket structure, characterized in that, include: An inner bushing having a first receiving cavity extending vertically through it, the first receiving cavity being used to install a hot nozzle; An outer bushing is installed and connected to the mold. The outer bushing has a second receiving cavity, a water inlet, and a water outlet. The second receiving cavity extends vertically and has a diameter reduction portion at its bottom that matches the shape of the bottom of the hot nozzle. The water inlet and the water outlet are respectively connected to an external pipe. The inner bushing is installed in the second receiving cavity, and the outer wall surface of the inner bushing abuts against the wall surface of the second receiving cavity. A first groove and a second groove are provided on the outer wall surface of the inner bushing. The first groove communicates with the water inlet, and the second groove communicates with the water outlet. There is a connecting space between the bottom of the inner bushing and the second receiving cavity for water to flow through. The connecting space is located near the constriction portion. The first groove extends vertically downward from the water inlet to the connecting space, and the second groove extends vertically downward from the water outlet to the connecting space. The connecting space, the first groove, and the second groove together constitute a water transport channel.

2. The cooling water jacket structure according to claim 1, characterized in that: The inlet and outlet are set at the same height and are both located at the top of the water transport channel.

3. The cooling water jacket structure according to claim 1, characterized in that: The inlet and outlet are positioned 180° apart.

4. The cooling water jacket structure according to claim 1, characterized in that: Both the inlet and the outlet have a vertical section and a horizontal section that are connected. The external pipe is connected to the vertical section; The water transport channel is connected to the transverse section.

5. The cooling water jacket structure according to claim 1, characterized in that: The inner bushing and the outer bushing are fitted with an upper sealing ring and a lower sealing ring; The water channel is located in the area between the upper sealing ring and the lower sealing ring.

6. The cooling water jacket structure according to claim 5, characterized in that: The top of the first receiving cavity has a stepped hole that is wider at the top and narrower at the bottom. The stepped hole has a first step and a second step from top to bottom. The first step is used to support the inner bushing. The inner bushing has a shoulder portion, and the shoulder portion and the second step portion form a first annular groove, and the upper sealing ring is installed in the first annular groove.

7. The cooling water jacket structure according to claim 5, characterized in that: The second receiving cavity has a bottom plane, and the constricted portion transitions through the bottom plane and is connected to the side wall of the second receiving cavity; The bottom of the inner bushing has a second annular groove, which abuts against the second receiving cavity, and the lower sealing ring is installed in the second annular groove.

Images