A valve sleeve integrated hot nozzle

Abstract

This utility model discloses a valve sleeve integrated hot nozzle, relating to the field of hot runner technology. It includes a hot nozzle body with a hot runner channel inside. The hot runner channel has a main flow channel, a primary flow channel, and secondary flow channels connected sequentially. The main flow channel is arranged along the central axis of the hot nozzle body. Multiple secondary flow channels are arranged in a ring around the central axis of the hot nozzle body. Multiple primary flow channels are arranged, each corresponding to one of the secondary flow channels, and flow obliquely or branching from the main flow channel to guide and divert molten plastic in the main flow channel to the secondary flow channels. Each secondary flow channel is equipped with a valve control assembly, which includes a valve needle and a valve sleeve. The valve needle is movably inserted into the valve sleeve, and the opening and closing of the discharge hole at the bottom of the secondary flow channel is controlled by the axial sliding of the valve needle relative to the valve sleeve. This helps to reduce the dimensional tolerances of multi-cavity injection molded parts.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, specifically a valve sleeve integrated hot nozzle. Background Technology

[0002] In the field of hot runner technology for injection molds, the hot runner nozzle, as a key component, plays a crucial role in accurately distributing and delivering the molten plastic injected by the injection molding machine to the mold cavity. Its design rationality directly affects the quality of the injection molded parts, production efficiency, and mold adaptability. In multi-cavity injection molding scenarios, the requirements for the uniformity of flow distribution, the smoothness of the runner, and the precision of valve control of the hot runner nozzle are particularly stringent.

[0003] However, traditional hot runner applications have many limitations: in terms of runner layout, multi-cavity branching is prone to uneven distribution of plastic melt due to design defects in the runner structure, resulting in deviations in dimensional accuracy and appearance consistency of the molded parts from different cavities; specifically, the connection between the main runner and the branch runners is mostly a right angle or a simple inclined structure. When the plastic melt flows from the main runner to the multi-branch runners, the difference in runner resistance (such as the length and angle deviation of different branches) can easily lead to uneven melt pressure and flow rate in each cavity, ultimately resulting in large weight tolerance and poor appearance consistency of the injection molded parts (such as shrinkage and flash).

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A valve sleeve integrated hot nozzle includes a hot nozzle body, the hot nozzle body having a hot flow channel inside, the hot flow channel having a main flow channel, a primary flow channel and a secondary flow channel connected in sequence.

[0007] The main flow channel is arranged along the central axis of the hot nozzle body. Multiple secondary flow channels are arranged in a ring around the central axis of the hot nozzle body. Multiple primary flow channels are arranged, each corresponding to one of the secondary flow channels, and flow at an angle or branching with the main flow channel to guide the molten plastic in the main flow channel to the secondary flow channels for diversion.

[0008] Each of the secondary flow channels is equipped with a valve control assembly, which includes a valve needle and a valve sleeve. The valve needle is movably inserted into the valve sleeve, and the opening and closing of the glue outlet at the bottom of the secondary flow channel is controlled by the axial sliding of the valve needle relative to the valve sleeve.

[0009] The primary flow channel includes an inlet section, a steady flow section, and an outlet section connected in sequence. The inlet section is connected to the end of the main flow channel, and the outlet section is connected to the secondary flow channel. The connection between the outlet section and the secondary flow channel is designed as an arc-shaped flared structure.

[0010] As a further embodiment of this utility model: a heating device is provided on the outside of the hot nozzle body, the heating device surrounding the hot nozzle body and corresponding to the relative areas of the primary flow channel and the secondary flow channel.

[0011] As a further embodiment of this utility model: the secondary flow channel includes a valve needle guide section, a transition section, and a discharge section connected sequentially from top to bottom;

[0012] The inner diameter of the valve needle guide section is clearance-fitted with the outer diameter of the valve needle;

[0013] The transition section is enlarged relative to the valve needle guide section, and the transition section is the part connecting the secondary flow channel and the primary flow channel outlet section. Its inner diameter gradually increases along the direction close to the primary flow channel outlet section, forming an arc-shaped flared structure.

[0014] As a further embodiment of this utility model: the valve needle includes a sliding guide section corresponding to the valve needle guide section of the secondary flow channel, a variable diameter section corresponding to the transition section, and a discharge control section corresponding to the discharge section.

[0015] The variable diameter section is set with a reduced diameter relative to the sliding guide section, and the variable diameter section corresponds to the outlet section of the primary flow channel.

[0016] As a further embodiment of this utility model: the discharge section includes a first flow channel, a second flow channel, a third flow channel, and a glue outlet that are connected sequentially from top to bottom;

[0017] The second flow channel is configured with a reduced diameter relative to the transition section, and the first flow channel is gradually connected between the transition section and the second flow channel.

[0018] The dispensing hole is narrower than the second flow channel, and the third flow channel is gradually connected between the second flow channel and the dispensing hole.

[0019] As a further embodiment of this utility model: an annular groove adapted to the valve sleeve is provided along the end face of the hot nozzle body, the outer side wall of the valve sleeve is interference-fitted with the inner side wall of the annular groove, wherein the annular groove is correspondingly connected to the secondary flow channel.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] By using a ring-shaped distribution of secondary runners and a one-to-one correspondence layout of primary runners, melt distribution deviations caused by differences in the spatial position of the runners are reduced. Furthermore, the arc-shaped flared structure optimizes the transition resistance of the runners, reducing melt pressure and flow fluctuations caused by differences in the connection shape of different secondary runners. This helps to reduce the dimensional tolerances of multi-cavity injection molded parts and improve the consistency of their appearance.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0026] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0027] Figure 4 yes Figure 2 Enlarged structural diagram at point B;

[0028] Figure 5 This is a schematic diagram of the valve needle in this utility model.

[0029] The reference numerals and names in the figure are as follows:

[0030] 1. Hot nozzle body; 2. Main flow channel; 3. Primary flow channel; 4. Secondary flow channel; 5. Valve needle; 6. Valve sleeve; 7. Inlet section; 8. Flow stabilizing section; 9. Outlet section; 10. Heating device; 11. Valve needle guide section; 12. Transition section; 13. Discharge section; 14. Sliding guide section; 15. Variable diameter section; 16. Discharge control section; 17. First flow channel; 18. Second flow channel; 19. Third flow channel; 20. Discharge hole; 21. Annular groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-5 In this embodiment of the present invention, a valve sleeve 6 integrated hot nozzle includes a hot nozzle body 1, wherein a hot flow channel is provided inside the hot nozzle body 1, and the hot flow channel has a main flow channel 2, a primary flow channel 3, and a secondary flow channel 4 connected in sequence.

[0033] The main flow channel 2 is arranged along the central axis of the hot nozzle body 1. Multiple secondary flow channels 4 are provided, and the multiple secondary flow channels 4 are evenly distributed in a ring around the central axis of the hot nozzle body 1. Multiple primary flow channels 3 are provided, and the multiple primary flow channels 3 correspond one-to-one with the multiple secondary flow channels 4, and flow in an inclined or branched manner with the main flow channel 2, which is used to guide and divert the molten plastic in the main flow channel 2 to the secondary flow channels 4.

[0034] Each of the secondary flow channels 4 is equipped with a valve control assembly, which includes a valve needle 5 and a valve sleeve 6. The valve needle 5 is movably inserted into the valve sleeve 6. The opening and closing of the glue outlet hole 20 at the bottom of the secondary flow channel 4 is controlled by the axial sliding of the valve needle 5 relative to the valve sleeve 6.

[0035] The primary flow channel 3 includes an inlet section 7, a steady flow section 8, and an outlet section 9 connected in sequence. The inlet section 7 is connected to the end of the main flow channel 2, and the outlet section 9 is connected to the secondary flow channel 4. The connection between the outlet section 9 and the secondary flow channel 4 is designed as an arc-shaped flared structure.

[0036] Among the above-mentioned technical means, this hot runner achieves orderly distribution and precise control of molten plastic by constructing a three-level progressive flow channel system of "main flow channel 2 - primary flow channel 3 - secondary flow channel 4";

[0037] Specifically, the main flow channel 2, located along the central axis of the hot nozzle body 1, receives the molten plastic injected by the injection molding machine. Multiple primary flow channels 3, which are inclined or branched to the main flow channel 2, guide the melt to multiple secondary flow channels 4, which are evenly distributed in a ring around the central axis. The geometric characteristics of this ring-shaped symmetrical layout ensure the initial balance of the multi-cavity flow distribution from a macroscopic structural perspective. Then, the arc-shaped flared structure at the junction of the primary flow channel 3 outlet section 9 and the secondary flow channel 4 replaces the traditional right angle or simple inclined connection with a smooth transition curved surface, optimizing the flow path of the melt when the flow channel changes direction and reducing resistance and eddies caused by abrupt changes in the flow channel cross-section. Each secondary flow channel 4 is equipped with a valve control assembly consisting of a valve needle 5 and a valve sleeve 6. The axial sliding of the valve needle 5 relative to the valve sleeve 6 controls the opening and closing of the corresponding dispensing hole 20. The valve needle 5 can achieve multiple synchronous actions through hydraulic, pneumatic, or servo motor drives. A unified power source or control system ensures consistent movement timing of each valve needle 5, meeting the collaborative control requirements of multi-cavity injection molding.

[0038] In summary, by using the annular distribution of secondary runners 4 and the one-to-one correspondence of primary runners 3, the melt distribution deviation caused by the difference in the spatial position of the runners is reduced. Furthermore, by combining the arc-shaped flared structure to optimize the runner transition resistance, the melt pressure and flow fluctuation caused by the difference in the connection shape of different secondary runners 4 are reduced, which helps to reduce the dimensional tolerance of multi-cavity injection molded parts and improve the appearance consistency.

[0039] In this embodiment of the present invention, a heating device 10 is provided on the outside of the hot nozzle body 1. The heating device 10 surrounds the hot nozzle body 1 and corresponds to the relative areas of the primary flow channel 3 and the secondary flow channel 4.

[0040] Based on the requirement for uniform plastic melt temperature in hot runner systems, a surrounding heating device 10 is installed outside the hot nozzle body 1, corresponding to the relative areas of the primary runner 3 and the secondary runner 4, forming a targeted temperature control structure: the primary runner 3, as the transition section from the main runner 2 to the secondary runner 4, needs to maintain a stable melt temperature to ensure uniform flow distribution; the secondary runner 4, as the terminal runner directly injected into the mold cavity, needs to prevent the melt from cooling down due to its long flow path or proximity to the cold mold, thus reducing its fluidity. The surrounding layout of the heating device 10 allows thermal radiation to uniformly cover these two key runner areas, directly compensating for heat loss from the runner walls through heat conduction, ensuring that the melt maintains a constant process temperature during flow distribution and injection. At the same time, the surrounding heating layout reduces the temperature gradient caused by the positional difference between the primary runner 3 and the secondary runner 4, reducing the viscosity change of the melt caused by local cooling, thereby helping to further maintain the pressure balance and flow consistency of each runner during multi-cavity injection molding.

[0041] In this embodiment of the present invention, the secondary flow channel 4 includes a valve needle guide section 11, a transition section 12, and a discharge section 13 connected sequentially from top to bottom;

[0042] The inner diameter of the valve needle guide section 11 is clearance-fitted with the outer diameter of the valve needle 5;

[0043] The transition section 12 is enlarged relative to the valve needle guide section 11, and the transition section 12 is the part that connects the secondary flow channel 4 and the outlet section 9 of the primary flow channel 3. Its inner diameter gradually increases along the direction close to the outlet section 9 of the primary flow channel 3, forming an arc-shaped flared structure.

[0044] The valve needle guide section 11 provides a guide track for the axial sliding of the valve needle 5 through a clearance fit with the outer diameter of the valve needle 5, ensuring that the valve needle 5 maintains coaxiality during movement; the transition section 12 adopts an expanded diameter and arc-shaped flared structure to receive the melt from the outlet section 9 of the primary flow channel 3. The expanded diameter design increases the buffer space for the melt to enter the secondary flow channel 4, while the arc-shaped flared opening reduces the resistance when the melt turns and flows smoothly, reducing eddies and dead angles; the discharge section 13 receives the melt stabilized by the transition section 12 and completes the final glue injection action.

[0045] In this embodiment of the present invention, the valve needle 5 includes a sliding guide section 14 corresponding to the valve needle guide section 11 of the secondary flow channel 4, a variable diameter section 15 corresponding to the transition section 12, and a discharge control section 16 corresponding to the discharge section 13.

[0046] The variable diameter section 15 is configured with a reduced diameter relative to the sliding guide section 14, and the variable diameter section 15 corresponds to the outlet section 9 of the primary flow channel 3.

[0047] The sliding guide section 14 and the valve needle guide section 11 of the secondary flow channel 4 are fitted with a clearance to ensure precise guidance of the axial movement of the valve needle 5. The variable diameter section 15 corresponds to the position of the transition section 12 and is relatively narrower than the sliding guide section 14. This design works in conjunction with the expansion structure of the transition section 12. When the melt enters the secondary flow channel 4 from the primary flow channel 3, the annular space formed by the variable diameter provides more buffer area for the melt, reducing the impact pressure of the melt on the valve needle 5, and avoiding the flow of the melt due to the excessive diameter of the valve needle 5. The discharge control section 16 works with the discharge section 13 to achieve precise opening and closing control of the dispensing port through the axial sliding of the valve needle 5.

[0048] In this embodiment of the present invention, the discharge section 13 includes a first flow channel 17, a second flow channel 18, a third flow channel 19, and a glue outlet 20 connected sequentially from top to bottom;

[0049] The second flow channel 18 is narrower than the transition section 12, and the first flow channel 17 is gradually connected between the transition section 12 and the second flow channel 18.

[0050] The dispensing hole 20 is narrower than the second flow channel 18, and the third flow channel 19 is gradually connected between the second flow channel 18 and the dispensing hole 20.

[0051] The first flow channel 17 serves as the connection area between the transition section 12 and the second flow channel 18. Through a gradually narrowing transition shape, the melt flowing in from the transition section 12 achieves increased flow rate and stable pressure as the cross-sectional area decreases, avoiding fluid turbulence caused by abrupt changes in cross-section. The second flow channel 18 maintains a small inner diameter, forming a stable melt delivery channel, providing a basis for precise control of melt flow rate. The gradual transition connection between the third flow channel 19 and the outlet hole 20 further increases the melt flow rate and concentrates the pressure, ensuring that the melt is injected into the mold cavity through the outlet hole 20 with a stable flow rate and pressure.

[0052] In this embodiment of the present invention, an annular groove 21 adapted to the valve sleeve 6 is provided along the end face of the hot nozzle body 1. The outer side wall of the valve sleeve 6 is interference-fitted with the inner side wall of the annular groove 21. The annular groove 21 is correspondingly connected to the secondary flow channel 4.

[0053] By interfering with the outer wall of the valve sleeve 6 and the inner wall of the annular groove 21, the tight mechanical connection generated by the interference provides axial and radial positioning constraints for the valve sleeve 6, counteracting the downward thrust and other forces generated by the melt on the valve sleeve 6 during injection, maintaining the relative positional stability of the valve sleeve 6, the hot nozzle body 1, and the secondary flow channel 4. At the same time, the sealing characteristics of the interference fit seal any gaps that may exist between the valve sleeve 6 and the hot nozzle body 1, preventing melt leakage from the valve sleeve 6 installed on the upper end face due to injection pressure, and ensuring the orderly flow path of the melt along the secondary flow channel 4 to the lower end face.

[0054] 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 exemplary 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.

Claims

1. A valve sleeve integrated hot nozzle, characterized in that, It includes a hot nozzle body, and the hot nozzle body has a hot runner channel inside, which has a main flow channel, a primary flow channel and a secondary flow channel connected in sequence. The main flow channel is arranged along the central axis of the hot nozzle body. Multiple secondary flow channels are arranged in a ring around the central axis of the hot nozzle body. Multiple primary flow channels are arranged, each corresponding to one of the secondary flow channels, and flow at an angle or branching with the main flow channel to guide the molten plastic in the main flow channel to the secondary flow channels for diversion. Each of the secondary flow channels is equipped with a valve control assembly, which includes a valve needle and a valve sleeve. The valve needle is movably inserted into the valve sleeve, and the opening and closing of the glue outlet at the bottom of the secondary flow channel is controlled by the axial sliding of the valve needle relative to the valve sleeve. The primary flow channel includes an inlet section, a steady flow section, and an outlet section connected in sequence. The inlet section is connected to the end of the main flow channel, and the outlet section is connected to the secondary flow channel. The connection between the outlet section and the secondary flow channel is designed as an arc-shaped flared structure.

2. The valve sleeve integrated hot nozzle according to claim 1, characterized in that, A heating device is provided on the outside of the hot nozzle body, and the heating device surrounds the hot nozzle body and corresponds to the relative areas of the primary flow channel and the secondary flow channel.

3. A valve sleeve integrated hot nozzle according to claim 1 or 2, characterized in that, The secondary flow channel includes a valve needle guide section, a transition section, and a discharge section connected sequentially from top to bottom; The inner diameter of the valve needle guide section is clearance-fitted with the outer diameter of the valve needle; The transition section is enlarged relative to the valve needle guide section, and the transition section is the part connecting the secondary flow channel and the primary flow channel outlet section. Its inner diameter gradually increases along the direction close to the primary flow channel outlet section, forming an arc-shaped flared structure.

4. The valve sleeve integrated hot nozzle according to claim 3, characterized in that, The valve needle includes a sliding guide section corresponding to the valve needle guide section of the secondary flow channel, a variable diameter section corresponding to the transition section, and a discharge control section corresponding to the discharge section. The variable diameter section is set with a reduced diameter relative to the sliding guide section, and the variable diameter section corresponds to the outlet section of the primary flow channel.

5. The valve sleeve integrated hot nozzle according to claim 3, characterized in that, The discharge section includes a first flow channel, a second flow channel, a third flow channel, and a glue outlet, which are connected sequentially from top to bottom; The second flow channel is designed with a reduced diameter relative to the transition section, and the first flow channel is gradually connected between the transition section and the second flow channel; The dispensing hole is narrower than the second flow channel, and the third flow channel is gradually connected between the second flow channel and the dispensing hole.

6. The valve sleeve integrated hot nozzle according to claim 1, characterized in that, An annular groove adapted to the valve sleeve is formed along the end face of the hot nozzle body. The outer wall of the valve sleeve is interference-fitted with the inner wall of the annular groove. The annular groove is connected to the secondary flow channel.

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