A heat dissipation structure and method for a hot runner nozzle core

Abstract

This invention discloses a heat dissipation structure and method for a hot runner nozzle core, including a dispensing tube with a nozzle core installed at its bottom. The nozzle core is inserted into the dispensing tube, and the nozzle core includes a nozzle core seat and a guide core located below the nozzle core seat. The nozzle core seat is inserted into the dispensing tube, and the dispensing tube is also equipped with a dispensing head, which is inserted into the dispensing tube and located below the nozzle core seat. The dispensing head includes a junction hole located above it, and the guide core is inserted into the junction hole. The nozzle core has a countersunk hole three, and the nozzle core seat has two channels two. An insert tube is inserted into each of the channels two. The insert tube includes two tube bodies one. The countersunk hole three, the channels two, and the two tube bodies one are interconnected. The tube bodies one pass through the dispensing tube and at least partially extend out of the dispensing tube. This invention provides a heat dissipation structure and method for a hot runner nozzle core, increasing the heat dissipation function at the gating gate, adjusting the gating temperature in a timely manner, and improving the product molding quality.

Description

Technical Field

[0001] This invention relates to the field of hot runner technology, and in particular to a heat dissipation structure and method for a hot runner nozzle core. Background Technology

[0002] Currently, when injection molding thick-walled light guides, the molding process is highly specialized due to their exceptionally thick walls. Thick-walled light guides require excellent light transmittance while avoiding shrinkage in the thicker areas and flow marks at critical light distribution points. Therefore, only high-pressure, low-speed molding processes can be used to mold these products. Furthermore, thick-walled light guides have stringent appearance requirements; defects such as yellowing and air bubbles are absolutely unacceptable. During the entire injection molding process, pressure loss in the molten plastic within the piping leads to temperature increases during molten material transport, resulting in uncontrollable and untimely temperature fluctuations at the gate. This leads to poor product quality and an increased scrap rate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat dissipation structure and method for a hot runner nozzle core, thereby increasing the heat dissipation function at the gating gate, adjusting the gating temperature in a timely manner, and improving the product molding quality.

[0004] This invention discloses a heat dissipation structure for a hot runner nozzle core, including a dispensing tube, a nozzle core installed at the bottom of the dispensing tube, the nozzle core being inserted into the dispensing tube, the nozzle core including a nozzle core seat and a guide core located below the nozzle core seat, the nozzle core seat being inserted into the dispensing tube, the dispensing tube also having a dispensing head installed, the dispensing head being inserted into the dispensing tube, the dispensing head being located below the nozzle core seat, the dispensing head including a junction hole located above, the guide core being inserted into the junction hole, the nozzle core having a countersunk hole three, the nozzle core seat having two channels two, an insert tube being inserted into the channels two, the insert tube including two tube bodies one, the countersunk hole three, the channels two, and the two tube bodies one being interconnected, the tube body one passing through the dispensing tube and at least partially extending out of the dispensing tube.

[0005] Furthermore, the second channel is radially arranged along the core seat, with two channels two distributed vertically. A plug is installed on the top of the third countersunk hole, and the bottom of the plug is arc-shaped. The connection between the upper channel two and the third countersunk hole is tangent to the arc-shaped bottom of the plug.

[0006] Furthermore, a sleeve is inserted into the second channel, and the first tube is inserted into the sleeve, allowing the first tube to move axially along the sleeve.

[0007] Furthermore, the cannula is fitted with a conduit that passes through one of the tube bodies. The conduit includes a port one and a port two. Port one is located at the bottom of the countersunk hole three, and port two extends out of the cannula and is located radially outside the injection tube.

[0008] Furthermore, the nozzle core seat is provided with a channel one, which axially penetrates the nozzle core seat. The glue injection tube is provided with a countersunk hole one and a countersunk hole two. The countersunk hole one is located above the countersunk hole two. The nozzle core seat is inserted into the countersunk hole one, and the bottom of the channel one is connected to the countersunk hole two.

[0009] Furthermore, the intubation tube is equipped with an inlet, which is fitted with a valve, and the intubation tube is also equipped with an outlet, which is fitted with a drainage box and connected to the outlet.

[0010] Furthermore, the lower sleeve is fitted with a cap, which is located on the side near the countersunk hole. The cap has a through hole that axially penetrates the cap.

[0011] This invention also discloses a heat dissipation method for a hot runner nozzle core, using a heat dissipation structure for the hot runner nozzle core, including the following heat dissipation method:

[0012] ① Cooling water is injected into the tube. The cooling water flows from tube one into countersunk hole three. After being heated, the cooling water boils and vaporizes, causing heat exchange between the outer wall of the guide core and the plastic molten material in the junction hole.

[0013] ② After the cooling water is heated and boiled, the water vapor enters the insertion tube from the upper sleeve and exchanges heat with the outside, then liquefies and flows back from the lower tube body one and through hole three to form a cooling cycle.

[0014] Furthermore, the cooling water temperature is 90℃-95℃.

[0015] The beneficial effects of this invention are:

[0016] 1. By installing the nozzle core and inserting the tube, the tube extends out of the injection tube, allowing the molten plastic in the manifold to exchange heat with the outside environment. This enables rapid adjustment of the molten plastic at the gate, solving the problem of temperature rise caused by high pressure loss during the transmission of molten plastic. As a result, the molten plastic at the injection port (i.e., injection head) can ensure that the injection temperature meets the requirements, improving the control of the molding quality of plastic products.

[0017] 2. By increasing the length of the insertion tube extending beyond the injection tube, the rate of heat exchange between the water vapor inside the insertion tube and the outside environment is controlled. Since the temperature of the injected cooling water is controlled at 90℃-95℃, it prevents the injection molten material from being suddenly cooled due to excessive temperature difference, which could cause product quality problems (yellowing, air marks, and other product defects). In addition, the cooling water can be vaporized immediately, and the heat is evenly transferred to the three-hole wall of the countersunk hole that is not in contact with the cooling water, making the heat exchange of the plastic molten material in the confluence hole smoother, thereby improving the subsequent product molding quality. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of an embodiment;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0021] Figure 4 for Figure 2 A cross-sectional view along the MM direction.

[0022] Figure reference numerals: 1. Injection tube, 11. Countersunk hole 1, 12. Nozzle core, 21. Nozzle core seat, 21. Channel 1, 211. Channel 2, 212. Guide core, 22. Countersunk hole 3, 23. Injection head, 31. Flow channel hole, 311. Connecting hole, 4. Plug, 5. Tube body 1, 51. Inlet, 52. Outlet, 53. Guide tube, 6. Port 1, 61. Port 2, 62. Tube sleeve, 7. Cap, 71. Through hole, 711. Drainage box, 8. Insert rod, 81. Boss, 811. Discharge port, 82. Valve 1, 83. Valve 2, 9. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, a heat dissipation structure for a hot runner nozzle core includes a dispensing tube 1, which is axially arranged in a vertical direction. A hot runner manifold is installed at the upper end of the dispensing tube 1. The bottom of the dispensing tube 1 is provided with a first countersunk hole 11 and a second countersunk hole 12, with the first countersunk hole 11 located above the second countersunk hole 12. A dispensing head 3 is installed at the bottom of the dispensing tube 1, with the upper end of the dispensing head 3 inserted into the second countersunk hole 12 and sealed and fixed. The dispensing tube 1 is axially provided with an injection channel. The injection molten material passing through the runner plate flows from top to bottom along the axial direction of the dispensing tube 1 and is injected into the mold cavity through the dispensing head 3.

[0025] like Figure 2 As shown, a nozzle core 2 is also installed at the bottom of the dispensing tube 1. The nozzle core 2 is inserted into the dispensing tube 1, and the nozzle core 2 is located above the dispensing head 3. Specifically, the nozzle core 2 includes a nozzle core seat 21 and a guide core 22 located below the nozzle core seat 21. The nozzle core seat 21 is inserted into the countersunk hole 11, and the outer peripheral wall of the nozzle core seat 21 fits against the wall of the countersunk hole 11. The upper end of the nozzle core seat 21 abuts against the upper wall of the countersunk hole 11, and the lower end of the nozzle core seat 21 abuts against the upper end of the dispensing head 3. The dispensing head 3 is provided with a flow channel hole 31, which extends vertically through the dispensing head 3. The flow channel hole 31 includes a confluence hole 311 located at the upper end, which is located below the nozzle core seat 21. The guide core 22 is inserted into the confluence hole 311. Figure 4The nozzle core seat 21 is provided with a channel 211, which axially passes through the nozzle core seat 21, and the bottom of the channel 211 is connected to the countersunk hole 12.

[0026] like Figure 2 As shown, the nozzle core 2 is provided with a countersunk hole 23. The countersunk hole 23 extends downward along the top surface of the nozzle core 2 to the bottom of the guide core 22. The bottom of the countersunk hole 23 does not penetrate the bottom of the guide core 22. A plug 4 is installed on the top of the countersunk hole 23, and the plug 4 seals the top outlet of the countersunk hole 23.

[0027] like Figure 2 As shown, the nozzle core seat 21 has two channels 212, which are radially arranged along the nozzle core seat 21. The two channels 212 are distributed vertically. The glue injection tube 1 has a channel coaxial with the channels 212. A sleeve 7 is inserted into the channel 212, and a insert tube 5 is slidably inserted into the sleeve 7. The left end of the insert tube 5 extends out of the glue injection tube 1, and the insert tube 5 can move axially along the inner wall of the sleeve 7. Specifically, combined with Figure 3 The cannula 5 includes two tube bodies 51, which are inserted into the inner wall of the sleeve 7 and can move axially along the sleeve 7. The tube body 51 passes through the glue injection tube 1 and extends at least partially out of the glue injection tube 1.

[0028] The upper end of the insert 5 extending from the left end of the injection tube 1 is provided with an inlet 52, and a valve 2 9 is installed at the inlet 52. The lower end of the insert 5 extending from the left end of the injection tube 1 is provided with an outlet 53. A drainage box 8 is installed on the insert 5, and the drainage box 8 is provided with a discharge port 82. A valve 1 83 is installed on the discharge port 82. Cooling water can be introduced through the inlet 52, and the cooling water can be discharged from the discharge port 82 of the drainage box 8 through the outlet 53. An insert rod 81 is threadedly connected to the bottom surface of the drainage box 8. The insert rod 81 is provided with a boss 811, which is located below the outlet 53. The outer diameter of the boss 811 is larger than the diameter of the outlet 53. The boss 811 moves upward to abut against the insert 5 to close the outlet 53, and the boss 811 moves downward to open the outlet 53.

[0029] like Figure 2 As shown, countersunk hole 3 23, channel 2 212, and two tube bodies 51 are interconnected. To be precise, countersunk hole 3 23, tube sleeve 7, and two tube bodies 51 are interconnected.

[0030] like Figure 2 , Figure 3As shown, the bottom of the plug 4 is arc-shaped, and the connection between the upper channel 212 and the countersunk hole 23 is tangent to the arc shape at the bottom of the plug 4. Cooling water is injected through the inlet 52, with the maximum injection volume not exceeding half the depth of the countersunk hole 23. The temperature of the injected cooling water is controlled at 90℃-95℃. As the cooling water flows into the countersunk hole 23, and the temperature of the injection molding melt is between 140℃ and 240℃, the cooling water in the countersunk hole 23 is heated and quickly boils and vaporizes. The water vapor enters the insertion tube 5 and flows through it. After exchanging heat with the outside through the insertion tube 5, it forms liquid and flows back into the countersunk hole 23. By increasing the length of the insertion tube 5 extending beyond the injection tube 1, the rate of heat exchange between the water vapor inside the insertion tube 5 and the outside can be controlled. Since the temperature of the injected cooling water is controlled at 90℃-95℃, it prevents the injection molten material from being suddenly cooled due to excessive temperature difference, which could cause product quality problems (yellowing, air marks, and other product defects). In addition, the cooling water can be vaporized immediately. When vaporized, the heat is evenly transferred to the wall of the countersunk hole 23 that is not in contact with the cooling water, making the heat exchange of the plastic molten material in the confluence hole 311 smoother, thereby improving the subsequent product molding quality.

[0031] like Figure 3 As shown, the lower sleeve 7 is equipped with a cap 71. The cap 71 is located near the countersunk hole 23. The lower end of the cap 71 is provided with a through hole 711. The hole 711 axially penetrates the cap 71, which reduces the inlet cross section of the lower sleeve 7. Most of the water vapor enters the upper sleeve 7 along the bottom arc surface of the plug 4, and then flows along the upper tube body 51 and liquefies after heat exchange with the outside. It then flows back to the countersunk hole 23 from the lower tube body 51 and through hole 711.

[0032] like Figure 2 , Figure 3 As shown, the insertion tube 5 is equipped with a conduit 6, which passes through one of the tube bodies 51. The conduit 6 includes a port 61 and a port 62. The port 61 is located at the bottom of the countersunk hole 23, and the port 62 extends out of the insertion tube 5 and is located radially outside the injection tube 1. By setting the conduit 6, water in the countersunk hole 23 can be extracted, so that the internal plastic melt can be cooled only when needed.

[0033] A heat dissipation method for a hot runner nozzle core, comprising the aforementioned heat dissipation structure for the hot runner nozzle core, wherein the specific heat dissipation method is as follows:

[0034] ①For example Figure 2 , Figure 3 As shown, valve 29 is opened and 90℃-95℃ cooling water is injected into the insertion tube 5. The cooling water flows from tube 1 51 into countersunk hole 3 23. After being heated, the cooling water boils and vaporizes, causing heat exchange between the outer wall of the guide core 22 and the plastic melt in the junction hole 311, which cools the plastic melt.

[0035] ② After the cooling water is heated and boiled, the water vapor enters the insertion tube 5 from the upper sleeve 7 and exchanges heat with the outside, then liquefies and flows back from the lower tube body 51 and through hole 711 to the sink hole 23, forming a cooling cycle.

[0036] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A heat dissipation structure for a hot runner nozzle core, characterized in that, The device includes a glue injection tube (1), a nozzle core (2) installed at the bottom of the glue injection tube (1), the nozzle core (2) being inserted into the glue injection tube (1), the nozzle core (2) including a nozzle core seat (21) and a guide core (22) located below the nozzle core seat (21), the nozzle core seat (21) being inserted into the glue injection tube (1), and a glue injection head (3) installed on the glue injection tube (1), the glue injection head (3) being inserted into the glue injection tube (1), the glue injection head (3) being located below the nozzle core seat (21), the glue injection head (3) including a guide core (22) located above the nozzle core seat (21). The confluence hole (311) is inserted into the guide core (22). The nozzle core (2) is provided with a countersunk hole three (23). The nozzle core seat (21) is provided with two channels two (212). A tube (5) is inserted and installed in the channel two (212). The tube (5) includes two tube bodies one (51). The countersunk hole three (23), the channel two (212), and the two tube bodies one (51) are interconnected. The tube body one (51) passes through the glue injection tube (1) and at least partially extends out of the glue injection tube (1). The injection tube (1) is used to flow the injection molten material, the temperature of the injection molten material is between 140℃ and 240℃, and the insertion tube (5) is filled with cooling water, the temperature of which is controlled between 90℃ and 95℃; The second channel (212) is arranged radially along the nozzle core seat (21), and the two second channels (212) are distributed vertically. A sleeve (7) is inserted into the second channel (212), and the first tube (51) is inserted into the sleeve (7). The first tube (51) can move along the axial direction of the sleeve (7). The insertion tube (5) is moved to increase the length of the insertion tube (5) extending out of the glue injection tube (1) to control the rate of heat exchange between water vapor in the insertion tube (5) and the outside.

2. The heat dissipation structure of the hot runner nozzle core according to claim 1, characterized in that, A plug (4) is installed on the top of the countersunk hole three (23). The bottom of the plug (4) is arc-shaped. The connection between the upper channel two (212) and the countersunk hole three (23) is tangent to the arc-shaped bottom of the plug (4).

3. The heat dissipation structure of a hot runner nozzle core according to claim 1, characterized in that, The insertion tube (5) is equipped with a conduit (6), which passes through one of the tube bodies (51). The conduit (6) includes a port (61) and a port (62). The port (61) is located at the bottom of the countersunk hole (23), and the port (62) extends out of the insertion tube (5) and is located radially outside the injection tube (1).

4. The heat dissipation structure of a hot runner nozzle core according to claim 1, characterized in that, The nozzle core seat (21) is provided with a channel one (211), the channel one (211) axially penetrates the nozzle core seat (21), the glue injection tube (1) is provided with a countersunk hole one (11) and a countersunk hole two (12), the countersunk hole one (11) is located above the countersunk hole two (12), the nozzle core seat (21) is inserted into the countersunk hole one (11), and the bottom of the channel one (211) is connected to the countersunk hole two (12).

5. The heat dissipation structure of a hot runner nozzle core according to claim 1, characterized in that, The insertion tube (5) is provided with an inlet (52), the inlet (52) is equipped with a valve (9), the insertion tube (5) is also provided with an outlet (53), the insertion tube (5) is equipped with a drainage box (8), and the drainage box (8) is connected to the outlet (53).

6. The heat dissipation structure of a hot runner nozzle core according to claim 1, characterized in that, The lower sleeve (7) is fitted with a cap (71), which is located near the countersunk hole (23). The cap (71) has a through hole (711) that axially penetrates the cap (71).

7. A heat dissipation method for a hot runner nozzle core, using the heat dissipation structure of the hot runner nozzle core according to any one of claims 1-6, characterized in that, The following heat dissipation methods are included: ① Cooling water is injected into the tube (5). The cooling water flows from the tube body (51) into the countersunk hole (23). The cooling water is heated and boils and vaporizes, causing heat exchange between the outer wall of the guide core (22) and the plastic melt in the junction hole (311). ② After the cooling water is heated and boiled, the water vapor enters the insertion tube (5) from the upper sleeve (7) and liquefies after heat exchange with the outside. It then flows back from the lower tube body (51) and through hole (711) to the sink hole (23) to form a cooling cycle.

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