Copper bush heater

Abstract

The utility model relates to the technical field of hot runner systems, in particular to a copper bush heater which comprises a heating copper bush and a heating strip, a plurality of circles of caulking grooves spirally extending around the axis of the heating copper bush are formed in the peripheral face of the heating copper bush, the caulking grooves are sequentially connected end to end, the heating strip is embedded in the caulking grooves, and the heating strip is arranged in the caulking grooves. A filling groove communicated with the caulking groove is formed in the peripheral face of the heating copper sleeve, and a connecting piece connected with the heating strip is arranged in the filling groove. By additionally arranging the filling groove communicated with the caulking groove and the connecting piece, the heating stability is remarkably improved, and the service life is remarkably prolonged.

Description

Technical Field

[0001] This application relates to the field of hot runner systems, and more particularly to a copper-jacketed heater. Background Technology

[0002] With the continuous development of hot runner technology, hot runner systems have been widely used in injection molding processes. The heating nozzle assembly is a key thermal component in a hot runner system. The heating nozzle assembly includes a heating copper sleeve with an axial material channel and a heating strip tightly wound around the outer surface of the heating copper sleeve. During operation, the heating strip generates Joule heat when energized, efficiently transferring heat to the heating copper sleeve through heat conduction. This heat then heats the material flowing through its internal channels (such as plastic filaments), bringing it to a molten or softened state for subsequent extrusion molding.

[0003] After prolonged use, the heating element in the heating nozzle assembly may loosen on the heating copper sleeve, potentially detaching from its outer surface and reducing heating efficiency. To address this, related technologies use a method of riveting the heating element to the outer surface of the heating copper sleeve. However, this method is prone to causing the heating element to loosen during assembly due to manual pulling, and the expansion of the heating copper sleeve and heating element during heating can also lead to detachment. Utility Model Content

[0004] To improve the secure fixing of the heating strip to the heating copper sleeve, this application provides a copper sleeve heater.

[0005] This application provides a copper-shoulder heater, which adopts the following technical solution:

[0006] A copper sleeve heater includes a heating copper sleeve and a heating strip. The outer circumferential surface of the heating copper sleeve has multiple spiral grooves extending around the axis of the heating copper sleeve, and the grooves are connected end to end in sequence. The heating strip is embedded in the grooves. The outer circumferential surface of the heating copper sleeve has a filling groove communicating with the grooves, and the filling groove has a connector for connecting the heating strip.

[0007] By adopting the above technical solution, a spiral groove connected end to end is set on the outer circumference of the heating copper sleeve to accommodate the heating strip, and a filling groove and connector connected to the groove are added, which achieves double fixation of the heating strip: the spiral structure of the groove forms a circumferential constraint on the heating strip to prevent radial loosening; the connector (such as solder) in the filling groove fuses the heating strip to the copper sleeve or welds two adjacent heating strips, which solves the problem of loosening caused by manual assembly pulling or thermal expansion in the traditional riveting process, and significantly improves heating stability and lifespan; and the setting of the filling groove plays a role in making room, so that the product surface is relatively flat and beautiful.

[0008] Optionally, the filling groove is connected to both adjacent slots, and the connector connects two adjacent heating strips.

[0009] By adopting the above technical solution, directly welding the heating copper sleeve and heating strip is difficult because the heating strip is made of stainless steel and the copper parts are made of brass. This also easily leads to the heating wire being punctured during welding, resulting in a lack of insulation. The filling groove in this application connects two adjacent grooves, allowing the connector to fix two adjacent rings of heating strips, making welding more convenient and improving welding stability.

[0010] Optionally, the filling groove has multiple openings.

[0011] By adopting the above technical solution, multiple filling grooves are set to form intermittent fixing points. This multi-point fixing method disperses the impact of thermal stress on a single connector, making it particularly suitable for long-stroke heating scenarios and effectively suppressing the overall displacement or torsion of the heating strip caused by thermal cycling deformation.

[0012] Optionally, each of the slots is divided into multiple groups, of which two groups are dense slot groups and one group is a sparse slot group. The sparse slot group is located between and connects the two dense slot groups. The distance between two adjacent slots in the dense slot group is smaller than the distance between two adjacent slots in the sparse slot group.

[0013] By adopting the above technical solution, since the two ends of the heating copper sleeve are usually connected to a heat sink, cold end, or other mechanical components with low temperatures, heat is rapidly conducted away from the ends of the copper sleeve. By grouping the grooves into dense groove groups and sparse groove groups, with the dense groove groups located on both sides, zoned temperature control is achieved: the high-density coils of the dense groove groups increase local heating power, suitable for areas requiring strong heat conduction; the sparse groove groups reduce coil density, avoiding overheating in the transition zone. This structure optimizes the axial temperature gradient and solves the problem of uneven plastic melting.

[0014] Optionally, the filling groove is connected to two adjacent slots in an adjacent dense groove group.

[0015] By adopting the above technical solution, the filling groove is specifically designed between adjacent grooves in the dense groove group, focusing on reinforcing high-power areas. Because the dense groove group generates concentrated heat and experiences greater thermal stress, this design prioritizes strengthening the connection strength of easily loosened areas, improving system reliability. Furthermore, the spacing between adjacent grooves in the dense groove group is smaller than that in the sparse groove group. This allows for a reduction in the connection distance of the welding heating wires while fixing adjacent heating elements, thus reducing the size of the filling groove and connectors, reducing raw materials, and lowering processing costs.

[0016] Optionally, the spacing between two adjacent slots in the dense slot group increases along the direction close to the sparse slot group in the axial direction of the heating copper sleeve.

[0017] By adopting the above technical solution, since the heat loss of the heating copper sleeve gradually decreases from the end to the middle, the spacing between adjacent slots in the dense slot group increases towards the sparse slot group, forming a gradual thermal expansion buffer zone, which is more suitable for the heat loss of the heating copper sleeve in actual use.

[0018] Optionally, the groove furthest from the sparse groove group in the dense groove group is the end groove, and the groove adjacent to the end groove in the dense groove group is the middle groove, and the filling groove connects the end groove and the middle groove.

[0019] By adopting the above technical solution, the filling groove is set between the end groove and the middle groove, which can further reduce the size of the filling groove and the connector; and the end groove, as the start and end point of the spiral coil, bears the maximum mechanical stress. This connection method prevents the end from loosening first due to vibration or thermal fatigue, and ensures the overall integrity of the coil.

[0020] Optionally, the end of the end slot away from the sparse slot group is the starting slot, the distance between the starting slot and the middle slot is constant along the extension direction of the starting slot, and the filling slot connects the starting slot and the middle slot.

[0021] By adopting the above technical solution, the starting groove and the middle groove maintain a constant distance, and the filling groove is set between the starting groove and the middle groove, so that the size of the filling groove and the connector can be minimized.

[0022] Optionally, the end groove further includes a connecting groove connected to the starting groove, the distance between the connecting groove and the middle groove increases along the extension direction of the groove near the sparse groove group, and the filling groove communicates with the end of the starting groove near the connecting groove.

[0023] By adopting the above technical solution, the filling groove and the starting groove are connected at the end near the connecting groove, that is, the filling groove is set close to the connecting groove, so that the distance between the first end of the filling groove and the first end of the starting groove is maximized. In this way, the filling groove is close to the middle while minimizing the size of the filling groove and the connecting piece, which has a fixing effect on the first end groove and the middle groove, making the heating strip more secure.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By adding a filling groove and connecting parts that communicate with the embedded groove, the heating stability and service life are significantly improved;

[0026] 2. While ensuring good fixation of adjacent heating elements, minimize the size of the filling groove and connector to reduce raw materials and lower processing costs. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the structure of this application.

[0028] Figure 2 This is a structural schematic diagram highlighting the groove and filling groove in this application.

[0029] Figure 3 This is the main view of the application that highlights the groove and the filling groove.

[0030] Explanation of reference numerals in the attached drawings: 1. Heating copper sleeve; 11. Embedded groove; 12. Filling groove; 2. Heating strip; 3. Connector; 4. Dense groove group; 41. End embedded groove; 411. Starting groove; 412. Connecting groove; 42. Middle embedded groove; 5. Sparse groove group. Detailed Implementation

[0031] The following combination Figures 1-3 This application will be described in further detail.

[0032] This application discloses a copper-sleeved heater. (Refer to...) Figure 1 and Figure 2 The copper sleeve heater includes a heating copper sleeve 1 and a heating element 2. Multiple spiral grooves 11 are formed on the outer circumferential surface of the heating copper sleeve 1, extending in a spiral shape around its axis. These grooves 11 are connected end-to-end, and the heating element 2 is embedded in one of the grooves 11. A filling groove 12 communicating with the grooves 11 is formed on the outer circumferential surface of the heating copper sleeve 1, and a connector 3 connected to the heating element 2 is provided within the filling groove 12.

[0033] Reference Figure 1 and Figure 2 The filling groove 12 is formed on the outer peripheral surface of the heating copper sleeve 1, and the filling groove 12 is connected to both adjacent recesses 11. The connector 3 is made of welding material and connects two adjacent heating strips 2. In other embodiments, the filling groove 12 can be formed on the groove wall of the recess 11, and the connector 3 connects the heating strip 2 and the heating copper sleeve 1.

[0034] Reference Figure 2 The filling groove 12 has multiple openings; in this embodiment, there are two filling grooves 12. In other embodiments, the filling groove 12 may have at least three openings.

[0035] Reference Figure 2 The grooves 11 are divided into multiple groups, two of which are dense groove groups 4, and one group is a sparse groove group 5. The sparse groove group 5 is located between and connects the two dense groove groups 4, that is, the two dense groove groups 4 are located at the two axial ends of the heating copper sleeve 1 respectively. The distance between two adjacent grooves 11 in the dense groove group 4 is smaller than the distance between two adjacent grooves 11 in the sparse groove group 5.

[0036] Reference Figure 2Two filling grooves 12 are located at the two axial ends of the heating copper sleeve 1, and each filling groove 12 corresponds to a different group of dense grooves 4, that is, the filling groove 12 is connected to two adjacent grooves 11 in the corresponding group of dense grooves 4. In other embodiments, the filling groove 12 may also be located in the middle of the heating copper sleeve 1, and the filling groove 12 is connected to two adjacent grooves 11 in the sparse groove group 5. In other embodiments, the filling groove 12 may also be located in the middle of the heating copper sleeve 1, and the filling groove 12 is located between the dense groove group 4 and the sparse groove group 5, that is, the filling groove 12 is connected to the grooves 11 in the sparse groove group 5 and the grooves 11 in the dense groove group 4.

[0037] Reference Figure 2 In the dense groove group 4, the spacing between two adjacent grooves 11 increases along the axial direction of the heating copper sleeve 1 towards the sparse groove group 5, that is, the pitch of the grooves 11 increases from the two axial ends of the heating copper sleeve 1 towards the middle. In other embodiments, the spacing between two adjacent grooves 11 in the dense groove group 4 can be a constant spacing.

[0038] Reference Figure 1 and Figure 3 In the dense groove group 4, the groove 11 furthest from the sparse groove group 5 is the end groove 41, and the groove 11 adjacent to the end groove 41 in the dense groove group 4 is the middle groove 42. The filling groove 12 connects the end groove 41 and the middle groove 42. In this embodiment, the filling groove 12 has a width of 4.1 mm, a depth of 0.8 mm, a distance of 10 mm between the filling groove 12 and the front end of the heating strip 2 (i.e., the bottommost end in the figure), and a distance of 6 mm between the filling groove 12 and the wire outlet end of the heating strip 2 (i.e., the topmost end in the figure). In other embodiments, the filling groove 12 can be located between any two adjacent grooves 11 in the dense groove group 4.

[0039] Reference Figure 3 The end of the end groove 41 furthest from the sparse groove group 5 is the starting groove 411, and the distance between the starting groove 411 and the middle groove 42 is constant along the extending direction of the starting groove 411. The filling groove 12 connects the starting groove 411 and the middle groove 42. In other embodiments, the distance between the end groove 41 and the middle groove 42 increases along the extending direction of the groove 11 near the sparse groove group 5.

[0040] Reference Figure 3 The end groove 41 also includes a connecting groove 412 connected to the starting groove 411, and the distance between the connecting groove 412 and the middle groove 42 increases along the extending direction of the groove 11 near the sparse groove group 5. The filling groove 12 communicates with the end of the starting groove 411 near the connecting groove 412. In other embodiments, the filling groove 12 may communicate with any part of the starting groove 411.

[0041] The implementation principle of a copper sleeve heater according to an embodiment of this application is as follows: a groove 11 is opened on the outer peripheral surface of the heating copper sleeve 1, and a filling groove 12 is opened that communicates with two adjacent grooves 11. The heating strip 2 is embedded in the groove 11, and then solder is filled into the filling groove 12. The two adjacent rings of heating strip 2 are welded together to fix the heating strip 2 on the heating copper sleeve 1.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A copper sleeve heater, comprising a heating copper sleeve (1) and a heating strip (2), characterized in that: The outer circumferential surface of the heating copper sleeve (1) has multiple spiral grooves (11) extending around the axis of the heating copper sleeve (1), and each groove (11) is connected end to end in sequence. The heating strip (2) is embedded in the groove (11). The outer circumferential surface of the heating copper sleeve (1) has a filling groove (12) communicating with the groove (11). The filling groove (12) has a connector (3) connected to the heating strip (2).

2. A copper-shoulder heater according to claim 1, characterized in that: The filling groove (12) is connected to the two adjacent grooves (11), and the connector (3) connects the two adjacent heating strips (2).

3. A copper-shoulder heater according to claim 2, characterized in that: The filling groove (12) has multiple openings.

4. A copper-shoulder heater according to claim 3, characterized in that: Each of the grooves (11) is divided into multiple groups, of which two groups of grooves (11) are dense groove groups (4) and one group of grooves (11) is a sparse groove group (5). The sparse groove group (5) is located between and connects the two dense groove groups (4). The distance between two adjacent grooves (11) in the dense groove group (4) is smaller than the distance between two adjacent grooves (11) in the sparse groove group (5).

5. A copper-shoulder heater according to claim 4, characterized in that: The filling groove (12) is connected to two adjacent slots (11) in the adjacent dense groove group (4).

6. A copper-shoulder heater according to claim 4, characterized in that: The spacing between two adjacent slots (11) in the dense slot group (4) increases along the direction close to the sparse slot group (5) in the axial direction of the heating copper sleeve (1).

7. A copper-shoulder heater according to claim 6, characterized in that: The groove (11) furthest from the sparse groove group (5) in the dense groove group (4) is the end groove (41), and the groove (11) adjacent to the end groove (41) in the dense groove group (4) is the middle groove (42). The filling groove (12) connects the end groove (41) and the middle groove (42).

8. A copper-shoulder heater according to claim 7, characterized in that: The end of the end slot (41) away from the sparse slot group (5) is the starting slot (411). The distance between the starting slot (411) and the middle slot (42) is constant along the extension direction of the starting slot (411). The filling slot (12) connects the starting slot (411) and the middle slot (42).

9. A copper-shoulder heater according to claim 8, characterized in that: The end groove (41) also includes a connecting groove (412) connected to the starting groove (411). The distance between the connecting groove (412) and the middle groove (42) increases along the extension direction of the groove (11) near the sparse groove group (5). The filling groove (12) is connected to the end of the starting groove (411) near the connecting groove (412).

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