Efficient heat preservation injection molding nozzle

Abstract

The upper portion of a nozzle body is sleeved with a flange used for being installed on a splitter plate, a graphene heating layer is arranged on the outer side wall of the nozzle body, and the graphene heating layer sequentially comprises an inner insulating layer, a graphene layer and an outer insulating layer from inside to outside. The graphene heating layer is provided with a pair of convex parts which can be conductively connected with the graphene layer and outwards protrude out of the outer insulating layer, and the pair of convex parts is electrically connected with a pair of electric wires penetrating through the side holes of the flange. The graphene heating layer is directly formed on the side wall outside the nozzle main body and is connected with the electric wire through the convex part for heating, the structure of a heater formed by the graphene heating layer and the convex part is simpler, and the flat structure of the graphene heating layer has a larger contact area with the nozzle body, so that more uniform heating can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of nozzles in the field of injection molding, in particular to a high-efficiency heat-insulating injection molding nozzle. Background Art

[0002] During the feeding process of the molten material in the injection nozzle, the fluidity of the molten material needs to be guaranteed to ensure the quality of the injection molded product. Therefore, a heater is required to cover the outside of the nozzle for heating. In the prior art, such as a hot runner injection nozzle with application number 202221780026.9, it is arranged around the inner core of the sleeve through a heating wire sleeve. The heating wire heats the outer periphery of the inner core of the sleeve and transfers the heat to the inside of the main runner through the inner core of the sleeve. This design requires winding the heating wire. On the one hand, the heating wire occupies space and causes the overall volume to increase. On the other hand, its coverage is limited and cannot achieve full coverage heating. There is also a design in which a heating wire is filled after a groove is milled on the side wall of the nozzle, but it increases the complexity of processing and the complexity of the structure.

[0003] In order to achieve uniform heating of the injection molding nozzle, the idea of ​​patent number 202420793709.0 applied by the applicant before the present application can also be adopted, that is, the material that can be evenly heated is applied to the cylindrical tube, and then the cylindrical tube is sleeved on the nozzle, but it also increases a certain amount of space and cost, and heat transfer is not directly performed, which also has a certain impact on the heat conduction effect and efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a high-efficiency heat-insulating injection molding nozzle, in which a graphene heating layer is directly formed on the side wall outside the nozzle body and is connected to an electric wire through a convex portion for heating. The heater structure formed by the graphene heating layer and the convex portion is simpler, and the flat structure of the graphene heating layer has a larger contact area with the nozzle body, which can achieve more uniform heating.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a high-efficiency thermal insulation injection molding nozzle, comprising at least a nozzle body and a nozzle tip, the upper part of the nozzle body is provided with a flange for mounting it on a diverter plate, a graphene heating layer is provided on the outer wall of the nozzle body, the graphene heating layer comprises an inner insulating layer, a graphene layer and an outer insulating layer from the inside to the outside, the graphene heating layer is provided with a pair of protrusions which can be conductively connected to the graphene layer and protrude outward from the outer insulating layer, and the pair of the protrusions are electrically connected to a pair of wires passing through the side holes of the flange.

[0006] As a further optimization, the protrusion is connected to the outer side wall of the graphene layer.

[0007] As a further optimization, the material of the inner insulating layer and / or the outer insulating layer is a high temperature resistant insulating material. Especially for the inner insulating layer, efficient heat conduction can be performed on the basis of achieving insulation.

[0008] As a further optimization, a limiting ring is provided on the side wall of the upper part of the mouth body, and the limiting ring is located above the convex portion. A limiting groove is provided on the upper end of the flange next to its mounting through hole, and the limiting ring is embedded in the limiting groove.

[0009] As a further optimization, a side groove is provided on the side wall of the mounting through hole for allowing the protrusion to move up and down.

[0010] As a further optimization, the limiting ring and the limiting groove are respectively provided with matching positioning cut surfaces and limiting cut surfaces, which can ensure that the convex part passes through the side groove accurately on the one hand, and prevent the mouth body from rotating relative to the flange on the other hand.

[0011] As a further optimization, the high-efficiency heat-insulating injection molding nozzle also includes a fixing block, which is provided with a pair of mounting holes for the wires to pass through, and a mounting groove with a covering surface larger than the mounting hole is provided on one side wall thereof, located next to the mounting hole, and a conductive sheet matching the mounting groove is provided in the mounting groove, one end of the conductive sheet is fixedly connected to the wire inserted into the mounting hole, and the other end protrudes from the fixing block, and the fixing block is installed in the side hole to conductively connect a pair of conductive sheets to a pair of protrusions respectively, and accurate and stable connection between the wire and the protrusion can be achieved by positioning the conductive sheet on the fixing block and installing the fixing block in the side hole.

[0012] As a further optimization, the mounting groove is a waist-shaped groove, which can prevent the conductive sheet and the wire from rotating.

[0013] As a further optimization, the coverage area of ​​the protrusion is larger than the coverage area of ​​the conductive sheet, so that the conductive sheet can be more conveniently aligned with the protrusion for connection.

[0014] As a further optimization, the protrusion is a cylindrical structure, which is welded to the side wall of the mouth body.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The graphene heating layer is directly formed on the side wall outside the nozzle body, and is connected to the wire through the conductive convex part for heating. The graphene heating layer and the convex part form a heater, and its structure is simpler, and there is no need to mill grooves on the nozzle body and then lay the heating wire;

[0017] 2. The graphene heating layer is laid flat on the nozzle body, which can completely wrap the side wall of the nozzle body, thus having a larger contact area, achieving a wider range and more uniform heating effect, and also reducing the heating power of the heating source;

[0018] 3. The inner insulating layer, the graphene layer and the outer insulating layer are formed in sequence by spraying or printing. The graphene heating layer is thinner and occupies less space, which is conducive to the setting of the nozzle and the overall coordination and arrangement with other nozzles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model.

[0020] Figure 2 This is a structural diagram of the graphene heating layer of the utility model located on the mouthpiece.

[0021] Figure 3 It is a structural diagram of the flange of the utility model.

[0022] Figure 4 This is a structural diagram of the flange of the utility model from another side perspective.

[0023] Figure 5 It is a structural diagram of the electric wire and the fixing block of the utility model. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 to Figure 2 As shown, a high-efficiency heat-insulating injection molding nozzle, the nozzle body 1 at least includes a nozzle body 111 and a nozzle tip 112 installed in the nozzle body 111, the upper part of the nozzle body 111 is sleeved with a flange 3 for installing it on a diverter plate, and a graphene heating layer 21 is provided on the outer wall of the nozzle body 111. The graphene heating layer 21 includes an inner insulating layer, a graphene layer and an outer insulating layer abutting each other from the inside to the outside, and the inner insulating layer abuts the outer wall of the nozzle body 111. The graphene heating layer 21 is provided with a pair of conductive protrusions 22 that can be conductively connected to the graphene layer and protrude outward from the outer insulating layer. The protrusions 22 are preferably cylindrical structures, and the pair of protrusions 22 are electrically connected to a pair of wires 41 passing through the side holes 30 on the flange 3.

[0026] In the present invention, the graphene heating layer 21 can be heated by connecting the wire 41, the protrusion 22 and the graphene layer and energizing them, so that the heat can be transferred to the nozzle body 111 for heating and heat preservation of the molten fluid therein. For the molding of the graphene heating layer 21, an inner insulating layer can be firstly molded on the outer wall of the nozzle body 111 by spraying or printing, which has an insulating and heat-conducting function, and then a graphene layer is molded on the outer wall of the inner insulating layer, and a pair of protrusions are arranged on the graphene layer by welding or conductive bonding. The protrusions are preferably made of silver, copper or graphite. After the graphene layer is energized by the protrusions, electrical energy can be converted into thermal energy, and then an outer insulating layer is molded on the outer wall of the graphene layer, which has at least an insulating function. The outer insulating layer only covers the graphene layer but not the pair of protrusions 22. Therefore, through the structural combination of the inner insulating layer, the graphene layer and the outer insulating layer, the graphene layer can be insulated from the outside world when it is electrically heated, but it can be heated at least inwardly (the inner insulating layer and its interior). In this way, the graphene heating layer 21 and a pair of protrusions 22 form a heater 2 that can heat and keep the nozzle body 1 warm.

[0027] The heater 2 of the utility model is formed by a graphene heating layer 21 and a protrusion 22 formed on the outer wall of the nozzle body 1 (nozzle body 111). The protrusion 22 passes through the outer insulating layer to realize the conductive connection between the graphene layer and the wire 41. Compared with conventional heaters, the graphene heating layer 21 does not need to mill grooves on the outer wall of the nozzle body 1 and bury the heating wire. The structure is simple, and the graphene heating layer 21 is flat on the outer wall of the nozzle body 1, and the wrapping is more uniform, which can achieve a more uniform heating effect.

[0028] Furthermore, the protrusion 22 is only connected to the outer wall of the graphene layer, which can facilitate the molding of the protrusion 22 on the graphene layer; of course, the protrusion 22 can also pass through the graphene layer inward and extend into the inner insulating layer (but cannot contact the nozzle body 111 to ensure insulation performance), but this method is not conducive to the molding of the graphene heating layer 21.

[0029] Preferably, the materials of the inner insulating layer and the outer insulating layer are both high temperature resistant insulating materials. For example, the inner insulating layer may preferably be made of ceramic glaze, which has both insulating properties and excellent thermal conductivity.

[0030] Combination Figure 3 and Figure 4As shown, a limiting ring 12 is provided on the side wall of the upper part of the nozzle body 111, and the limiting ring 12 is located above the protrusion 22. The upper end of the flange 3 is located next to its mounting hole 301 and is provided with a limiting groove 302. The limiting ring 12 is embedded in the limiting groove 302, and the nozzle body 111 is extended from top to bottom into the mounting hole 301 on the flange 3. By embedding the limiting ring 12 in the limiting groove 302, the position of the nozzle body 1 on the flange 3 can be limited, and the nozzle body 1 can also be installed on the diverter plate through the flange 3.

[0031] Furthermore, a side groove 31 is provided on the side wall of the installation hole 301 for allowing the protrusion 22 to move up and down, so that the protrusion 22 can be allowed to move to the bottom of the installation hole 301 when the nozzle body 111 moves downward relative to the flange 3.

[0032] To match the above-mentioned side groove 31, matching positioning cut surfaces 121 and limiting cut surfaces 32 can be respectively provided on the limiting ring 12 and the limiting groove 302. Accurate installation of the positioning cut surface 121 and the limiting cut surface 32 can ensure that the protrusion 22 accurately passes through the side groove 31.

[0033] Combination Figure 1 and Figure 5 As shown, in another embodiment of the utility model, the high-efficiency heat-insulating injection molding nozzle also includes a fixing block 42, which is provided with a pair of mounting holes 421 for the wires 41 to pass through, and a mounting groove 422 with a covering surface larger than the mounting hole 421 is provided on one side wall thereof, located next to the mounting hole 421, and a conductive sheet 411 matching therewith is provided in the mounting groove 422, one end of the conductive sheet 411 is fixedly connected to the wire 41 extending into the mounting hole 421, and the other end protrudes from the fixing block 42, and the fixing block 42 is interference-mounted in the side hole 30 to conductively connect the pair of conductive sheets 411 to the pair of protrusions 22 respectively. Therefore, the electric wire 41, the fixing block 42 and the conductive sheet 411 together constitute the power supply part 4 for supplying power to the heater 2. By positioning and installing the fixing block 42 in the side hole 30, and positioning and installing the conductive sheet 411 electrically connected to the electric wire 41 in the mounting groove 422, the relative position of the electric wire 41 can be fixed, and connected to the protrusion 22 in a stable position (i.e., the position of the conductive sheet 411), thereby ensuring the accuracy and stability of the connection between the heater 2 and the power supply part 4. More specifically, the assembly of the power supply part 4 can be as follows: firstly, the electric wire 41 is passed through the mounting hole 421 on the fixing block 42, and then the conductive sheet 411 is welded at its end, and then the electric wire 41 is pulled back so that its end is completely embedded in the mounting hole 421 so that the conductive sheet 411 is embedded in the mounting groove 422.

[0034] The mounting groove 422 is a waist-shaped groove, which can position the conductive sheet 411 and prevent the conductive sheet 411 (and the wire 41 ) from rotating relative to the fixing block 42 .

[0035] Preferably, the coverage area of ​​the protrusion 22 is larger than the coverage area of ​​the conductive sheet 411 , so that the conductive sheet 411 can be easily aligned with and docked with the protrusion 22 after being inserted into the side hole 30 .

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-efficiency heat-insulating injection molding nozzle, comprising at least a nozzle body and a nozzle tip, wherein the upper portion of the nozzle body is sleeved with a flange for mounting on a manifold, characterized in that: A graphene heating layer is arranged on the outer wall of the nozzle body, and the graphene heating layer includes an inner insulating layer, a graphene layer and an outer insulating layer from the inside to the outside. The graphene heating layer is provided with a pair of protrusions that can be conductively connected to the graphene layer and protrude outward from the outer insulating layer. The pair of protrusions are electrically connected to a pair of wires passing through the side holes of the flange.

2. The high-efficiency heat-insulating injection molding nozzle according to claim 1, characterized in that: The convex portion is connected to the outer side wall of the graphene layer.

3. The high-efficiency heat-insulating injection molding nozzle according to claim 2, characterized in that: The material of the inner insulating layer and / or the outer insulating layer is a high temperature resistant insulating material.

4. The high-efficiency heat-insulating injection molding nozzle according to any one of claims 1 to 3, characterized in that: A limiting ring is provided on the side wall of the upper part of the mouth body, and the limiting ring is located above the convex part. A limiting groove is provided on the upper end of the flange beside its mounting through hole, and the limiting ring is embedded in the limiting groove.

5. The high-efficiency heat-insulating injection molding nozzle according to claim 4, characterized in that: A side groove is provided on the side wall of the mounting through hole to allow the convex portion to move up and down.

6. The high-efficiency heat-insulating injection molding nozzle according to claim 5, characterized in that: The limiting ring and the limiting groove are respectively provided with matching positioning cut surfaces and limiting cut surfaces.

7. The high-efficiency heat-insulating injection molding nozzle according to any one of claims 1 to 3, characterized in that: It also includes a fixing block, which is provided with a pair of mounting holes for the wires to pass through, and a mounting groove with a covering surface larger than the mounting hole is provided on one side wall of the fixing block and located next to the mounting hole, and a conductive sheet matching the fixing block is provided in the mounting groove, one end of the conductive sheet is fixedly connected to the wire extending into the mounting hole, and the other end protrudes from the fixing block, and the fixing block is installed in the side hole to conductively connect a pair of conductive sheets to a pair of protrusions respectively.

8. The high-efficiency heat-insulating injection molding nozzle according to claim 7, characterized in that: The mounting groove is a waist-shaped groove.

9. The high-efficiency heat-insulating injection molding nozzle according to claim 7, characterized in that: The coverage area of ​​the protrusion is larger than the coverage area of ​​the conductive sheet.

10. The high-efficiency heat-insulating injection molding nozzle according to claim 1 or 9, characterized in that: The convex part is a cylindrical structure, which is welded to the side wall of the mouth body.

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