Hot nozzle assembly and hot runner system
By installing a pressure cap in the hot runner system and having it in direct contact with the heater, the contradiction between nozzle tip hardness and thermal conductivity is resolved, ensuring stable gate temperature and improving the wear resistance of the hot nozzle assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUDO SUZHOU HOT RUNNER SYST
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-07
AI Technical Summary
In traditional hot runner systems, the nozzle tip has good thermal conductivity but low hardness, making it prone to wear and deformation, and unable to guarantee the gate temperature; while replacing the nozzle tip with a material with high hardness results in poor thermal conductivity, which cannot meet the temperature requirements.
A pressure cap is fitted under the nozzle tip, and the gate is placed on the pressure cap. The pressure cap is in direct contact with the heater, and heat is transferred through the pressure cap to ensure the gate temperature. At the same time, a nozzle tip material with high hardness is used.
This achieves stable gate temperature while maintaining nozzle tip hardness, avoiding nozzle tip deformation and improving the wear resistance of the hot nozzle assembly.
Smart Images
Figure CN224465167U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hot runner technology, and more particularly to a hot nozzle assembly and a hot runner system with the hot nozzle assembly. Background Technology
[0002] In traditional hot runner systems, the hot nozzle assembly typically includes a hot nozzle, a nozzle tip located within the hot nozzle, and a valve needle. The valve needle is driven to reciprocate within the flow channel formed by the hot nozzle and the nozzle tip, thereby opening or closing the gate formed on the nozzle tip to initiate or stop the dispensing process. During the movement of the valve needle, it impacts the nozzle tip. The nozzle tip is usually made of a material with good thermal conductivity to maintain the molten material at a certain temperature, thus ensuring the fluidity of the molten material. However, materials with good thermal conductivity generally have low hardness, are not wear-resistant, and are easily deformed.
[0003] To improve this problem, the nozzle tip was replaced with a material with higher hardness, but the temperature of the nozzle tip gate could not be guaranteed. Summary of the Invention
[0004] The purpose of this application is to provide a hot nozzle assembly in which a pressure cap is fitted onto the lower part of the nozzle tip, and the gate is set on the pressure cap, and the pressure cap is in direct contact with the heater. The pressure cap can provide heat to the gate, which solves the problems of insufficient gate temperature and easy deformation of nozzle tip in the prior art.
[0005] To achieve one of the above-mentioned objectives, one embodiment of this application provides a hot nozzle assembly, comprising:
[0006] The hot nozzle body has a first flow channel formed inside;
[0007] The nozzle tip is disposed within the hot nozzle body and extends out of the hot nozzle body, and the nozzle tip forms a second flow channel that communicates with the first flow channel;
[0008] A pressure cap is fitted onto the lower part of the nozzle tip and partially disposed between the hot nozzle body and the nozzle tip. The pressure cap forms a gate that communicates with the second flow channel, and the pressure cap extends outward to provide a boss. The outer diameter of the boss is equal to the outer diameter of the hot nozzle body.
[0009] A heater is fitted over the hot nozzle body and the boss, and the inner diameter of the heater is equal to the outer diameter of the hot nozzle body.
[0010] As a further improvement of one embodiment of this application, the heater includes a heat-conducting sleeve and a heating wire, the outer wall of the heat-conducting sleeve is provided with a heating groove, and the heating wire is disposed in the heating groove.
[0011] As a further improvement of one embodiment of this application, the heating groove is spirally arranged around the outer wall of the heat-conducting sleeve.
[0012] As a further improvement of one embodiment of this application, the heating wire at least partially overlaps with the boss in the radial direction of the hot nozzle body.
[0013] As a further improvement of one embodiment of this application, the pressure cap is provided with a gate and a first end face is formed at one end. A connecting part is provided in the middle of the first end face around the gate, and the connecting part is formed with a connecting surface.
[0014] As a further improvement of one embodiment of this application, a first temperature sensing groove is provided on the outer wall of the hot nozzle body, and the heater further includes a temperature sensing wire, which includes a wire body and is disposed in the first temperature sensing groove.
[0015] As a further improvement of one embodiment of this application, the boss is provided with a second temperature sensing groove; the temperature sensing wire also includes a temperature sensing head, which is disposed in the second temperature sensing groove.
[0016] As a further improvement of one embodiment of this application, the hot nozzle body is further provided with a receiving cavity for accommodating the nozzle tip. The receiving cavity is connected to the first flow channel and its inner diameter is larger than that of the first flow channel. The upper end face of the nozzle tip abuts against the top of the receiving cavity.
[0017] As a further improvement of one embodiment of this application, the tip of the nozzle extends outward with a protrusion, the pressure cap portion extends into the receiving cavity and is threadedly connected to the hot nozzle body, and the top of the pressure cap abuts against the bottom of the protrusion.
[0018] One embodiment of this application also provides a hot runner system, including a manifold and a hot nozzle assembly connected to the manifold, wherein the hot nozzle assembly is the hot nozzle assembly as described above.
[0019] One or more technical solutions provided in this application have at least the following technical effects or advantages:
[0020] In the hot nozzle assembly provided in this application, a pressure cap is fitted onto the lower part of the nozzle tip, and the gate is set on the pressure cap. The pressure cap is in direct contact with the heater, which can provide heat to the gate through the pressure cap. This allows the nozzle tip to be replaced with a high-hardness material, while the gate can still reach the desired temperature. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the hot nozzle assembly in an embodiment of this application.
[0022] Figure 2 yes Figure 1 Top view of the central heating nozzle assembly.
[0023] Figure 3 yes Figure 2 Schematic diagram of cross section along line AA.
[0024] Figure 4 yes Figure 3 Enlarged view of section B in the middle.
[0025] Figure 5 yes Figure 1 Side view of the central heating nozzle assembly after the heat-conducting sleeve has been removed.
[0026] 1. Hot nozzle body; 11. First flow channel; 12. Receiving cavity; 13. First temperature sensing groove; 2. Nozzle tip; 21. Second flow channel; 22. Protrusion; 3. Pressure cap; 31. Gate; 32. Boss; 321. Second temperature sensing groove; 33. First end face; 34. Abutting part; 341. Abutting surface; 4. Heat-conducting sleeve; 41. Heating groove; 5. Valve needle. Detailed Implementation
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0028] The terms used in this document, such as “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” indicating spatial relative positions, are used for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative positions” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.
[0029] For example, if the device in the figure is flipped, a unit described as being "below" or "under" other units or features will be "above" other units or features. Therefore, the exemplary term "below" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise) and the spatially related descriptive terms used herein will be interpreted accordingly.
[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0031] Furthermore, it should be understood that although the terms "first," "second," etc., may be used herein to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another. For example, a first temperature sensing tank may be referred to as a second temperature sensing tank, and similarly, a second temperature sensing tank may be referred to as a first temperature sensing tank, without departing from the scope of protection of this application.
[0032] This application provides a hot nozzle assembly, such as... Figures 1-4 As shown, the device includes a hot nozzle body 1, a nozzle tip 2, a pressure cap 3, and a heater. A first flow channel 11 is formed inside the hot nozzle body 1. The nozzle tip 2 is disposed inside the hot nozzle body 1 and extends out of the hot nozzle body 1, forming a second flow channel 21 that communicates with the first flow channel 11. The pressure cap 3 is fitted onto the lower part of the nozzle tip 2 and is partially disposed between the hot nozzle body 1 and the nozzle tip 2. The pressure cap 3 has a gate 31 that communicates with the second flow channel 21, and a boss 32 extends outward from the pressure cap 3. The outer diameter of the boss 32 is equal to the outer diameter of the hot nozzle body 1. The heater is fitted onto the hot nozzle body 1 and the boss 32, and its inner diameter is equal to the outer diameter of the hot nozzle body 1.
[0033] Normally, to ensure the temperature of the gate 31, the nozzle tip 2 is made of a metal with good thermal conductivity, such as copper. However, the copper is easily deformed because the valve pin 5 will collide with the nozzle tip 2 when sealing. If the nozzle tip 2 is replaced with a harder material such as stainless steel, the thermal conductivity of the harder material is usually poor and cannot meet the temperature of the gate 31.
[0034] In this application, the pressure cap 3 is fitted onto the lower end of the nozzle tip 2, so that the gate 31 can be positioned on the pressure cap 3, such as... Figure 3 In the process, the inner diameter of the lower end of the second flow channel 21 of the nozzle tip 2 gradually decreases until it matches the valve needle 5. During the sealing process, the valve needle 5 first impacts the nozzle tip 2 and then matches the gate 31 on the pressure cap 3 for sealing. Therefore, the nozzle tip 2 of this application needs to be made of a material with high hardness.
[0035] This application also places the heater over the cap 3, allowing the heater to directly provide heat to the cap 3. The cap 3 then transfers the heat from the heater to the gate 31, ensuring that the gate 31 has a sufficient temperature. In this application, since the gate 31 is located on the cap 3, the cap 3 directly obtains heat from the heater to ensure the temperature of the gate 31. When the valve needle 5 seals, it first impacts the inner wall of the nozzle tip 2, rather than the cap 3 with the gate 31. Therefore, the cap 3 can be made of a material with high thermal conductivity but not necessarily high hardness, while still ensuring that the component at the gate 31 does not deform and that the gate 31 has a sufficient temperature. Therefore, in this application, the nozzle tip 2 can be made of a material with high hardness, while the cap 3 can be made of a material with good thermal conductivity. In other words, the hardness of the nozzle tip 2 is higher than that of the cap 3, and the thermal conductivity of the cap 3 is higher than that of the nozzle tip 2.
[0036] It should be noted that in this application, the flow direction of the colloid in the first flow channel 11 and the second flow channel 21 is defined as "downward", and the direction opposite to the flow direction of the colloid is defined as "upward".
[0037] Furthermore, the heater includes a heat-conducting sleeve 4 and a heating wire (not shown in the figure). The outer wall of the heat-conducting sleeve 4 is provided with a heating groove 41, and the heating wire is disposed in the heating groove 41.
[0038] The heat-conducting sleeve 4 is preferably made of copper, which has excellent thermal conductivity and can transfer the heat from the heating wire to the heat nozzle body 1 and the pressure cap 3. A heating groove 41 is provided on the copper heat-conducting sleeve 4, and the heating wire is placed in the heating groove 41, which can fix the heating wire. Furthermore, the wall thickness of the heat-conducting sleeve 4 is thinner at the heating groove 41, resulting in better heat transfer from the heating wire.
[0039] Furthermore, the heating groove 41 is spirally arranged around the outer wall of the heat-conducting sleeve 4, thereby ensuring uniform heating of the heater in the radial direction of the heat nozzle body 1. Of course, the density of the spiral heating groove 41 can be set according to actual needs, such as... Figure 1 In the middle part of the hot nozzle body 1, the density is relatively low.
[0040] In some embodiments, the heating wire at least partially overlaps with the boss 32 in the radial direction of the hot nozzle body 1. Of course, as... Figure 3 In this case, the heating groove 41 needs to coincide at least partially with the boss 32 in the radial direction of the hot nozzle body 1.
[0041] The boss 32 of the pressure cap 3 is the part that directly contacts the heater. Extending the heating groove 41 and the heating wire to the part where the boss 32 is provided will make the heating wire closer to the boss 32 and improve the heat transfer effect.
[0042] In some embodiments, the pressure cap 3 is provided with a gate 31 and a first end face 33 is formed at one end. An abutment portion 34 is provided around the gate 31 in the middle of the first end face 33, and an abutment surface 341 is formed in the abutment portion 34.
[0043] When the hot runner assembly is in use, the first end face 33 of the pressure cap 3 typically abuts against the inner wall of the mold cavity. This application provides a protruding abutment portion 34 on the first end face 33. This abutment portion 34 is only provided around the gate 31, and the resulting abutment surface 341 has a small area, which is used to replace the first end face 33 in abutting against the inner wall of the mold cavity, thus minimizing heat loss from the pressure cap 3. Furthermore, a void structure is formed between the first end face 33 of the pressure cap 3 and the inner wall of the mold cavity, further preventing heat loss.
[0044] In some embodiments, such as Figure 5In the process, a first temperature sensing groove 13 is provided on the outer wall of the hot nozzle body 1, and the heater also includes a temperature sensing wire, which includes a wire body and is disposed in the first temperature sensing groove 13.
[0045] By opening a first temperature-sensing groove 13 on the outer wall of the hot nozzle body 1 to place the wire body, the wire body is hidden inside the heater, which can better fix the wire body.
[0046] Furthermore, such as Figure 1 In option 5, the boss 32 is provided with a second temperature sensing groove 321; the temperature sensing wire also includes a temperature sensing head, which is disposed in the second temperature sensing groove 321.
[0047] A second temperature sensing groove 321 is provided on the boss 32, and a temperature sensing head for measuring temperature is placed in the second temperature sensing groove 321. The boss 32 is close to the gate 31, and placing the temperature sensing head in the boss 32 can more accurately control the temperature of the gate 31.
[0048] Figure 5 In the process, the first temperature sensing groove 13 and the second temperature sensing groove 321 are basically overlapped in the length direction of the hot nozzle body 1, so as to shorten the length of the wire body.
[0049] Regarding the connection of the hot nozzle assembly, in some embodiments, the hot nozzle body 1 is further provided with a receiving cavity 12 for accommodating the nozzle tip 2. The receiving cavity 12 is connected to the first flow channel 11 and its inner diameter is larger than that of the first flow channel 11. The upper end face of the nozzle tip 2 abuts against the top of the receiving cavity 12.
[0050] like Figure 3 In this design, the inner diameter of the lower end of the first flow channel 11 is equal to the inner diameter of the upper end of the second flow channel 21, so that no step is formed at the connection between the first flow channel 11 and the second flow channel 21, which would cause glue to accumulate. The tip of the nozzle 2 is pressed tightly against the top of the receiving cavity 12 to prevent glue from overflowing from the connection between the nozzle tip 2 and the hot nozzle body 1.
[0051] Furthermore, the tip of the nozzle 2 extends outward with a protrusion 22, and the pressure cap 3 extends into the receiving cavity 12 and is threadedly connected to the hot nozzle body 1, with the top of the pressure cap 3 abutting against the bottom of the protrusion 22.
[0052] By providing a protrusion 22 at the top of the nozzle tip 2, and using the top of the pressure cap 3 to abut against the bottom of the protrusion 22, the nozzle tip 2 is pressed upwards against the hot nozzle body 1. The hot nozzle body 1 and the nozzle tip 2 are connected by the pressure cap 3, without the need for a separate connecting structure. The pressure cap 3 is threadedly connected to the hot nozzle body 1. During installation, the pressure cap 3 is slipped onto the outside of the nozzle tip 2 from below, and then the pressure cap 3 and the nozzle tip 2 are inserted together into the receiving cavity 12. The pressure cap 3 is rotated to make it threadedly connected to the hot nozzle body 1 until the nozzle tip 2 is pressed tightly against the hot nozzle body 1. At this time, the top of the protrusion 32 of the pressure cap 3 also abuts against the bottom of the hot nozzle body 1.
[0053] This application also provides a hot runner system, including a manifold and a hot nozzle assembly connected to the manifold, wherein the hot nozzle assembly is the aforementioned hot nozzle assembly.
[0054] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0055] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.
Claims
1. A hot nozzle assembly, characterized in that, include: The hot nozzle body has a first flow channel formed inside; The nozzle tip is disposed within the hot nozzle body and extends out of the hot nozzle body, and the nozzle tip forms a second flow channel that communicates with the first flow channel; A pressure cap is fitted onto the lower part of the nozzle tip and partially disposed between the hot nozzle body and the nozzle tip. The pressure cap forms a gate that communicates with the second flow channel, and the pressure cap extends outward to provide a boss. The outer diameter of the boss is equal to the outer diameter of the hot nozzle body. A heater is fitted over the hot nozzle body and the boss, and the inner diameter of the heater is equal to the outer diameter of the hot nozzle body.
2. The hot nozzle assembly according to claim 1, characterized in that, The heater includes a heat-conducting sleeve and a heating wire. The outer wall of the heat-conducting sleeve is provided with a heating groove, and the heating wire is disposed in the heating groove.
3. The hot nozzle assembly according to claim 2, characterized in that, The heating groove is spirally wound around the outer wall of the heat-conducting sleeve.
4. The hot nozzle assembly according to claim 2, characterized in that, In the radial direction of the hot nozzle body, the heating wire at least partially coincides with the boss.
5. The hot nozzle assembly according to claim 1, characterized in that, The pressure cap has a gate at one end with a first end face, and a connecting part is provided in the middle of the first end face around the gate, the connecting part forming a connecting surface.
6. The hot nozzle assembly according to claim 1, characterized in that, The outer wall of the hot nozzle body is provided with a first temperature sensing groove, and the heater also includes a temperature sensing wire, which includes a wire body and is disposed in the first temperature sensing groove.
7. The hot nozzle assembly according to claim 6, characterized in that, The boss is provided with a second temperature sensing groove; the temperature sensing wire also includes a temperature sensing head, which is disposed in the second temperature sensing groove.
8. The hot nozzle assembly according to claim 1, characterized in that, The hot nozzle body is also provided with a receiving cavity for accommodating the nozzle tip. The receiving cavity is connected to the first flow channel and its inner diameter is larger than that of the first flow channel. The upper end face of the nozzle tip abuts against the top of the receiving cavity.
9. The hot nozzle assembly according to claim 8, characterized in that, The tip of the nozzle has a protrusion extending outward, and the pressure cap extends into the receiving cavity and is threadedly connected to the hot nozzle body, with the top of the pressure cap abutting against the bottom of the protrusion.
10. A hot runner system, characterized in that, It includes a manifold and a hot nozzle assembly connected to the manifold, wherein the hot nozzle assembly is the hot nozzle assembly according to any one of claims 1 to 9.