Spray head assembly for 3D printer and 3D printer

Abstract

The utility model provides a 3D printer's spray head subassembly, including printing nozzle, heat dissipation subassembly and heating subassembly, the heating subassembly is sleeved outside the printing nozzle, the heat dissipation subassembly is connected with the heating subassembly through adapter piece, there is gap between printing nozzle and adapter piece. According to the utility model, the adapter is arranged on the heat dissipation device, the heating assembly is connected through the adapter, and due to the existence of the adapter, a space can be reserved between the nozzle and the heat dissipation assembly in the heating assembly, so that a consumable channel in the nozzle is separated from a consumable channel of the conveying part; consumable materials can be heated at proper positions in the nozzle, meanwhile, the consumable materials far away from an outlet of the nozzle can be prevented from being fused in advance, and smooth printing is guaranteed.

Description

Technical Field

[0001] The utility model relates to a 3D printer, in particular to a printing nozzle structure used for the 3D printer. Background Art

[0002] With the development of science and technology, 3D printer technology is becoming more and more advanced and popular. Fused deposition molding is one of the 3D printing technologies. The whole process is to melt the filament through the nozzle and then form the product by deposition. This type of printer is usually called FDM 3D printer. In the FDM 3D printing process, the filament needs to be transported to the nozzle through the extrusion mechanism, heated and melted inside the nozzle, and then printed from the nozzle. In this process, it is very important to ensure that the filament is melted at the right time and position, because if the filament enters the molten state too early, it may stick to the inside of the channel before being extruded from the nozzle. If the filament melts too slowly, it may cause slow printing or even failure to complete printing.

[0003] There are some structural designs in the prior art for controlling the heat and consumables in the nozzle area. Chinese patent CN215320669U discloses a 3D printing heating nozzle and a 3D printer using the same. The patent specification discloses a technical solution of setting a ceramic heat insulation sheet between the ceramic heating tube and the heat dissipation unit to avoid direct contact between the ceramic heating tube and the heat dissipation unit or high-efficiency thermal interaction to cause heat loss. However, the ceramic sheet in the patent is not designed for hot melting of consumables, but only to avoid direct collision of extreme hot and cold temperatures. Chinese patent CN109514860A discloses a throat structure, nozzle device, and desktop 3D printer for a 3D printer. The throat structure disclosed in the patent is processed with a heat insulation area to isolate the heat dissipation area from the heating area. The function of the heat insulation area in the patent is to reduce the range of the heating area in the throat to control the extrusion amount of the printing material, and use the throat material to prevent the consumables from sticking. However, the applicant found that in practice, the above structure cannot completely solve the problem of melting control of consumables at the nozzle, and the structure is relatively complex. Partitioning the throat will increase production costs a lot. Once the throat is blocked, it needs to be replaced, and the parts loss is high.

[0004] Therefore, it is necessary to provide a nozzle assembly design for a 3D printer with a more reliable structure and lower cost. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a nozzle assembly for a 3D printer in view of the problems existing in the background technology.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] A nozzle assembly for a 3D printer comprises a printing nozzle, a heat dissipation assembly and a heating assembly, wherein the heating assembly is sleeved outside the printing nozzle, the heat dissipation assembly is connected to the heating assembly via an adapter, and a cavity is provided between the printing nozzle and the adapter.

[0008] Furthermore, the cavity is located in the heating component.

[0009] Furthermore, the height of the cavity is 1 to 3 times the diameter of the 3D printer consumables.

[0010] Furthermore, the heat dissipation component includes a throat, and a first channel capable of allowing printing consumables of the 3D printer to pass through is provided in the throat.

[0011] Furthermore, the adapter includes a connecting section, and the connecting section extends into the first channel.

[0012] Furthermore, the depth of the connecting section extending into the first channel is not less than half of the overall height of the heat dissipation assembly, or the depth of the connecting section extending into the first channel is not more than one third of the overall height of the heat dissipation assembly.

[0013] Furthermore, a second channel capable of allowing printing consumables of the 3D printer to pass therethrough is provided in the adapter, and the second channel is connected to the first channel.

[0014] Furthermore, the adapter is made of a material with poor thermal conductivity.

[0015] Furthermore, the printing nozzle is made of a material with good thermal conductivity.

[0016] Furthermore, a third channel capable of allowing consumables of the 3D printer to pass therethrough is provided in the printing nozzle, and the consumables are heated to a printable state in the third channel.

[0017] Furthermore, the heat dissipation assembly includes a heat sink, and a heat dissipation fan is provided on one side of the heat sink.

[0018] On this basis, the utility model also provides a 3D printer that can adopt the above-mentioned nozzle assembly, wherein a consumables channel is provided inside the 3D printer, and the consumables enter the nozzle assembly from bottom to top through the consumables channel.

[0019] The beneficial effects of the utility model are as follows: (1) The utility model sets an adapter on the heat dissipation device, and connects the heating component through the adapter. Due to the existence of the adapter, space can be reserved between the nozzle and the heat dissipation component in the heating component, and the consumable channel in the nozzle and the consumable channel in the transmission part are separated, so that the consumable can be heated at an appropriate position in the nozzle, and at the same time, the consumable far from the nozzle outlet can be prevented from melting in advance, thereby ensuring smooth printing. (2) The adapter of the utility model extends into the throat of the heat sink and forms a consumable channel together with the channel inside the throat. The adapter is made of a material with poor thermal conductivity, which can well control the heat exchange in the consumable channel inside the heat sink and does not affect the transportation of solid consumables. (3) The utility model does not need to change the existing overall structure of the nozzle, heat dissipation and heating, will not bring a burden to the processing process, and the processing cost of the finished product is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the nozzle assembly of the utility model.

[0021] Figure 2 It is an internal structure diagram (section view) of the nozzle assembly of the utility model.

[0022] Figure 3 It is a schematic diagram of the adapter of the utility model (the nozzle assembly and the heating assembly are omitted).

[0023] Figure 4 It is an overall structural diagram of the printer of the present utility model.

[0024] Numbers in the figure: printing nozzle 1, heat dissipation component 2, heating component 3, throat 4, printing consumables 5, first channel 6, adapter 7, connecting section 8, second channel 9, cavity 10, third channel 11, cooling fan 12. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand and implement the technical solution of the utility model, the utility model is described in detail, clearly and completely in the form of embodiments in combination with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Moreover, based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the utility model.

[0026] Example 1, refer to the attached Figure 1 , Figure 2 and Figure 3 .

[0027] The present embodiment provides a nozzle assembly for a 3D printer, including a printing nozzle 1, a heat dissipation assembly 2 and a heating assembly 3. The heating assembly 3 can be a heating sleeve, the outside of which is connected to electricity through a cable, and the heating assembly 3 is sleeved on the outside of the printing nozzle 1. The heat dissipation assembly 1 includes a heat sink, and a throat 4 is provided in the heat sink. The throat 4 is provided with a first channel 6 that allows a printing consumable 5 of the 3D printer to pass through. In the present utility model, the printing consumable 5 is usually a cylindrical solid consumable with good hot-melt performance, which can be collected by winding the consumable, and pulled out by a conveying mechanism during printing and sent into the printer.

[0028] The upper part of the heat dissipation component 1 is provided with an adapter 7, which includes a connecting section 8, which can be pressed into the throat 4 of the heat sink, and ensure that the depth of the pressing is not less than half of the overall height of the heat sink, or the depth of the connecting section extending into the first channel does not exceed one third of the overall height of the heat dissipation component. Experiments show that the above two combined sizes can ensure thermal insulation performance. Connected to the heating component, there is a cavity between the printing nozzle and the adapter.

[0029] A second channel 9 is also provided in the adapter 7 to allow the printing consumables 5 to pass through. When the connecting section 8 of the adapter 7 is pressed into the throat, the second channel 9 and the first channel 6 are connected as one.

[0030] Preferably, the adapter 7 is made of a material with poor thermal conductivity, such as titanium alloy or other metal materials with poor thermal conductivity, and the throat is made of copper or brass, so that the cost of the heat sink itself can be reduced. In contrast, the print nozzle 1 is made of a material with good thermal conductivity, and a third channel 11 is provided in the print nozzle to allow the printing consumables 5 to pass through, and the consumables are heated to a printable state in the third channel.

[0031] The lower part of the heating component 3 can be connected to the adapter 7, and then the upper part of the heating component 3 is connected to the nozzle. In this embodiment, the adapter 7 is processed with external threads for connecting with the heating component. In practice, other fixing methods can also be selected as needed. The two-stage connection of one up and one down leaves a gap to form a cavity inside the heating component 3, such as Figure 2 As shown, there is a cavity 10 between the bottom of the printing nozzle 1 and the top of the adapter 7, the height of the cavity is 1 to 3 times the diameter of the 3D printer filament, and the inner diameter of the cavity is 1.5 to 4 times the diameter of the filament. Through the setting of the cavity, a partition is formed between the heat sink and the nozzle heating area using space. Although this partition will not completely block heat transfer, combined with the poor thermal conductivity of the adapter 7, it can prevent the filament that has not entered the printing nozzle from being heated to melting, and the cavity can also preheat the filament entering the printing nozzle before melting, so that printing can be smoother.

[0032] In the utility model, the design of the cavity does not require additional complicated design or processing of components (such as step surfaces, concave-convex rings, etc.), the production cost is low, and processing and replacement are very convenient.

[0033] Preferably, in order to improve the heat dissipation performance of the heat dissipation area, a heat dissipation fan 12 can be provided on one side of the heat dissipation component 2.

[0034] Example 2, refer to the attached Figure 3 .

[0035] The present embodiment provides a 3D printer, which can use the nozzle assembly of Example 1 for printing. As shown in the figure, in the printer, the entire nozzle assembly is arranged on the upper part of the printer, and other supporting components such as an extrusion mechanism can be arranged in the printer to send the consumables from bottom to top to the heat dissipation assembly 2, and then enter the printing nozzle 1 through the heat dissipation assembly for printing.

[0036] Other implementations of this embodiment can refer to Example 1, and specific technical processes not described in detail in this embodiment can be implemented by referring to solutions in the prior art.

Claims

1. A nozzle assembly for a 3D printer, characterized in that: It comprises a printing nozzle, a heat dissipation component and a heating component. The heating component is sleeved outside the printing nozzle. The heat dissipation component is connected to the heating component through an adapter. A cavity is provided between the printing nozzle and the adapter.

2. A nozzle assembly for a 3D printer according to claim 1, characterized in that: The cavity is located within the heating assembly.

3. A nozzle assembly for a 3D printer according to claim 1 or 2, characterized in that: The height of the cavity is 1 to 3 times the diameter of the consumable material for the 3D printer.

4. A nozzle assembly for a 3D printer according to claim 1, characterized in that: The heat dissipation component includes a throat, and a first channel is provided in the throat to allow the printing consumables of the 3D printer to pass through.

5. A nozzle assembly for a 3D printer according to claim 4, characterized in that: The adapter includes a connecting section, and the connecting section extends into the first channel.

6. A nozzle assembly for a 3D printer according to claim 5, characterized in that: The depth of the connecting section extending into the first channel is not less than half of the overall height of the heat dissipation component, or the depth of the connecting section extending into the first channel is not more than one third of the overall height of the heat dissipation component.

7. A nozzle assembly for a 3D printer according to claim 5, characterized in that: The adapter is provided with a second channel capable of allowing printing consumables of the 3D printer to pass therethrough, and the second channel is connected to the first channel.

8. A nozzle assembly for a 3D printer according to claim 1 or 5, characterized in that: The adapter is made of a material with poor thermal conductivity.

9. The nozzle assembly for a 3D printer according to claim 1, characterized in that: The printing nozzle is made of a material with good thermal conductivity.

10. The nozzle assembly for a 3D printer according to claim 1, characterized in that: A third channel is provided in the printing nozzle for allowing consumables of the 3D printer to pass through, and the consumables are heated to a printable state in the third channel.

11. A nozzle assembly for a 3D printer according to claim 1, characterized in that: The heat dissipation component comprises a heat dissipation fin, and a heat dissipation fan is arranged on one side of the heat dissipation fin.

12. A 3D printer, characterized in that: The printer adopts the nozzle assembly described in any one of claims 1-11.

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