Printer nozzle sealing structure

Abstract

A printer nozzle sealing structure comprises a throat pipe, a nozzle and a heating block, the throat pipe is fixedly connected to the upper end of the heating block, the nozzle is fixedly connected to the lower end of the heating block, the throat pipe is internally provided with a first channel, the nozzle is internally provided with a second channel, the bottom surface of the throat pipe is in line contact with the top surface of the nozzle, and the top surface of the nozzle is in line contact with the heating block. The first channel is in butt joint with the second channel; one of the bottom surface of the throat pipe and the top surface of the nozzle is designed to be the arc-shaped surface, and the other surface is still kept to be the plane, so that the arc-shaped surface and the plane are in linear contact, and the contact part of the throat pipe and the nozzle can have higher compression stress by using smaller pressing force or tightening force when the throat pipe and the nozzle are in butt joint during mounting; therefore, the good sealing effect of the part is guaranteed, and when the contact part is slightly uneven, the line contact part can be crushed, so that the uneven part is sealed, and the cost is lower.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a nozzle sealing structure of a printer. Background Art

[0002] Fused Deposition Modeling (FDM) 3D printer is one of the most common desktop 3D printing technologies, which uses thermoplastic materials to build objects layer by layer through a nozzle. The melted material is extruded through a nozzle and then cooled and solidified to achieve the printing of three-dimensional objects.

[0003] In the prior art, the nozzle of a 3D printer usually connects the throat and the nozzle, and the printing material travels from the throat to the nozzle. Therefore, the seal at the joint between the throat and the nozzle affects the performance of the entire nozzle. In general, Figure 5 As shown in the figure, the butt joint surface between the throat and the nozzle is usually flat, and the contact between the two is surface contact, which requires the butt joint surface to have good flatness to ensure the sealing effect.

[0004] The processing cost is high, and during the use of the nozzle, its internal parts may be displaced due to extrusion pressure, friction, thermal deformation, etc., which will cause a gap between the throat and the nozzle. In order to ensure a stable seal of the surface contact, it is usually necessary to press the two with a large pressure. If it is connected by a thread, a large tightening force is required to ensure the compression state of the contact surface. If the compression force of the contact surface is too large, it may cause the parts to break, and if the compression force is too small, it will cause insufficient sealing and lead to material leakage.

[0005] Therefore, it is necessary for the inventor to design a new printer nozzle sealing structure to overcome the above problems. Summary of the invention

[0006] The main purpose of the present application is to provide a printer nozzle sealing structure to solve the problem in the related art that the surface contact processing cost at the joint between the throat and the nozzle is high and a large pressing force is required to ensure the sealing state.

[0007] In order to achieve the above-mentioned purpose, the present application provides a printer nozzle sealing structure, including a throat, a nozzle and a heating block, the throat is fixedly connected to the upper end of the heating block, the nozzle is fixedly connected to the lower end of the heating block, the throat has a first channel, the nozzle has a second channel, the bottom surface of the throat is in line contact with the top surface of the nozzle, and the first channel is connected to the second channel.

[0008] Preferably, the bottom surface of the throat includes a first arc surface convex outwardly, and the top surface of the nozzle includes a first concave conical surface, and the first arc surface is in line contact with the first conical surface.

[0009] Preferably, the bottom surface of the throat includes a second conical surface that is concave inwardly, the top surface of the nozzle includes a second arc surface that is convex outwardly, and the second conical surface is in line contact with the second arc surface.

[0010] Preferably, the bottom surface of the throat includes a third arc-shaped surface protruding outward, and the top surface of the nozzle is a first plane.

[0011] Preferably, the bottom surface of the throat is a second plane, and the top surface of the nozzle includes a fourth arc-shaped surface protruding outward.

[0012] Preferably, the throat pipe and the heating block are fixedly connected via a clamping structure.

[0013] Preferably, the clamping structure includes a first limiting surface and a second limiting surface, the first limiting surface is fixedly provided at the upper end of the throat pipe, the first limiting surface abuts against the top surface of the heating block, the second limiting surface is fixedly provided in the inner cavity of the heating block, and the lower end of the throat pipe is fixedly provided with a protrusion that cooperates and abuts against the second limiting surface.

[0014] Preferably, the nozzle is threadedly connected to the lower end of the heating block.

[0015] The printer nozzle sealing structure provided by the utility model has the following beneficial effects compared with the prior art:

[0016] One of the bottom surface of the throat and the top surface of the nozzle is designed to be an arc surface, while the other surface remains flat, so that the contact between the arc surface and the flat surface is a line contact. During installation, when the two are docked, a smaller pressing force or tightening force can be used to give the contact part of the two a higher compressive stress, thereby ensuring a good sealing effect at this part, and when the contact part is slightly uneven, the line contact part can be crushed so that the uneven part can also be sealed, which is more cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] Figure 1 It is the overall structure diagram of the utility model;

[0019] Figure 2 This is a structural diagram of the joint between the throat and the nozzle of the utility model (Example 2);

[0020] Figure 3This is a structural diagram of the joint between the throat and the nozzle of the utility model (Example 3);

[0021] Figure 4 This is a structural diagram of the joint between the throat and the nozzle of the utility model (Example 4);

[0022] Figure 5 It is a structural diagram of the joint between the nozzle and the throat in the prior art of the utility model.

[0023] Among them: 1. throat; 2. nozzle; 3. heating block; 4. first channel; 5. second channel; 6. first arc surface; 7. first conical surface; 8. second conical surface; 9. second arc surface; 10. third arc surface; 11. first plane; 12. second plane; 13. fourth arc surface; 14. first limiting surface; 15. second limiting surface; 16. bump. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0027] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0028] In addition, the term "plurality" shall mean two or more.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, a sealing structure of a printer nozzle 2 comprises a throat 1, a nozzle 2 and a heating block 3, wherein the throat 1 is fixedly connected to the upper end of the heating block 3, and the nozzle 2 is fixedly connected to the lower end of the heating block 3, wherein the throat 1 has a first channel 4, and the nozzle 2 has a second channel 5, wherein the bottom surface of the throat 1 is in line contact with the top surface of the nozzle 2, and the first channel 4 is in contact with the second channel 5; during operation, the material moves from the first channel 4 of the throat 1 to the second channel 5 of the nozzle 2, and the heating block 3 presses the throat 1 The material in the throat 1 is heated and then kept warm or heated. One of the bottom surface of the throat 1 and the top surface of the nozzle 2 is designed to be an arc surface, while the other surface remains flat, so that the contact between the arc surface and the flat surface is a line contact. During installation, when the two are docked, a smaller pressing force or tightening force can be used to make the contact part of the two have a higher compressive stress, thereby ensuring a good sealing effect of the part, and when the contact part is slightly uneven, the line contact part can be crushed so that the uneven part is also sealed, which is more cost-effective.

[0032] The bottom surface of the throat 1 includes a first arc surface 6 protruding outward, and the top surface of the nozzle 2 includes a first concave conical surface 7, and the first arc surface 6 is in line contact with the first conical surface 7; when working, the first arc surface 6 is inserted into the first conical surface 7 to achieve docking, and the contact between the two is line contact. The docking of the arc surface and the conical surface also has a centering effect, so that the axis of the first channel 4 on the throat 1 and the second channel 5 on the nozzle 2 is not easy to deviate, and the docking sealing effect is better.

[0033] The throat pipe 1 is fixedly connected to the heating block 3 via a snap-fit ​​structure; the snap-fit ​​structure includes a first limiting surface 14 and a second limiting surface 15, the first limiting surface 14 is fixedly arranged at the upper end of the throat pipe 1, the first limiting surface 14 abuts against the top surface of the heating block 3, the second limiting surface 15 is fixedly arranged in the inner cavity of the heating block 3, and the lower end of the throat pipe 1 is fixedly provided with a protrusion 16 that cooperates and abuts against the second limiting surface 15; during operation, the first limiting surface 14 and the second limiting surface 15 respectively limit the downward movement and upward movement of the throat pipe 1, thereby ensuring the fixation of the throat pipe 1. It should be noted that, in addition to fixing the throat pipe 1 via a snap-fit ​​structure, any other method that can fix the throat pipe 1 can be used here.

[0034] The nozzle 2 is threadedly connected to the lower end of the heating block 3; when working, the nozzle 2 is connected to the throat 1 by tightening the nozzle 2. In this embodiment, the throat 1 can also be connected to the heating block 3 by threading, and the connection between the two is achieved by tightening the two.

[0035] Embodiment 2: Figure 2 As shown, the difference between this embodiment and the first embodiment is that: the bottom surface of the throat 1 includes a concave second conical surface 8, the top surface of the nozzle 2 includes a second arc surface 9 convex outward, and the second conical surface 8 is in line contact with the second arc surface 9; compared with the first embodiment, this embodiment only sets the arc surface on the nozzle 2, and the effect produced is the same as that of the embodiment.

[0036] Embodiment 3: Figure 3 As shown, the difference between this embodiment and the first embodiment is that: the bottom surface of the throat 1 includes a third arcuate surface 10 protruding outward, and the top surface of the nozzle 2 is a first plane 11; compared with the first embodiment, the convexity of the arcuate surface and the concavity of the plane are eliminated in this embodiment, and the effect of centering the first channel 4 and the second channel 5 during installation and use is worse than that of the first embodiment.

[0037] Embodiment 4: Figure 4 As shown, the difference between this embodiment and the first embodiment is that: the bottom surface of the throat 1 is a second plane 12, and the top surface of the nozzle 2 includes a fourth arcuate surface 13 protruding outward; compared with the first embodiment, this embodiment cancels the convexity of the same arcuate surface and the concavity of the plane, and the effect of centering the first channel 4 and the second channel 5 during installation and use is worse than that of the first embodiment, but the processing cost is lower than that of the first embodiment.

[0038] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A printer nozzle (2) sealing structure, comprising a throat (1), a nozzle (2) and a heating block (3), characterized in that: The throat (1) is fixedly connected to the upper end of the heating block (3), and the nozzle (2) is fixedly connected to the lower end of the heating block (3). The throat (1) has a first channel (4), and the nozzle (2) has a second channel (5). The bottom surface of the throat (1) is in line contact with the top surface of the nozzle (2), and the first channel (4) is in contact with the second channel (5).

2. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The bottom surface of the throat (1) comprises a first arc surface (6) protruding outwards, and the top surface of the nozzle (2) comprises a first concave conical surface (7), and the first arc surface (6) is in line contact with the first conical surface (7).

3. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The bottom surface of the throat (1) includes a second conical surface (8) that is concave inwardly, and the top surface of the nozzle (2) includes a second arc surface (9) that is convex outwardly, and the second conical surface (8) is in line contact with the second arc surface (9).

4. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The bottom surface of the throat (1) comprises a third arc-shaped surface (10) protruding outwards, and the top surface of the nozzle (2) is a first plane (11).

5. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The bottom surface of the throat (1) is a second plane (12), and the top surface of the nozzle (2) includes a fourth arc-shaped surface (13) protruding outwards.

6. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The throat pipe (1) and the heating block (3) are fixedly connected via a clamping structure.

7. A printer nozzle (2) sealing structure as claimed in claim 6, characterized in that: The clamping structure comprises a first limiting surface (14) and a second limiting surface (15); the first limiting surface (14) is fixedly arranged at the upper end of the throat pipe (1), the first limiting surface (14) abuts against the top surface of the heating block (3), the second limiting surface (15) is fixedly arranged in the inner cavity of the heating block (3), and the lower end of the throat pipe (1) is fixedly provided with a protrusion (16) that cooperates and abuts against the second limiting surface (15).

8. A printer nozzle (2) sealing structure as claimed in claim 1, characterized in that: The nozzle (2) is threadedly connected to the lower end of the heating block (3).

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