Ink control structure and direct liquid marker

Abstract

This application provides an ink control structure and a direct-liquid marker. The ink control structure includes a pen barrel, a reservoir, and a core. An ink storage cavity is formed inside the pen barrel. The reservoir is disposed within the pen barrel and has a through mounting cavity along its axial direction. A venting groove extending along the axial direction is provided on the outer peripheral wall of the reservoir, connecting the ink storage cavity to the external environment. The core is fitted into the mounting cavity, with one end connected to the pen tip and the other end extending into the ink storage cavity. The venting groove includes a first section near the pen tip and a second section near the ink storage cavity, with the width of the second section greater than the width of the first section. The wider second section in this application provides a larger gas flow cross-sectional area, enabling more rapid replenishment of external air to the ink storage cavity, significantly improving venting efficiency and effectively balancing the internal and external pressures of the pen barrel.

Description

Technical Field

[0001] This application relates to the field of marker technology, and in particular to an ink control structure and a direct-liquid marker. Background Technology

[0002] Markers are writing and drawing tools widely used in design, drawing, annotation, and other fields. Some direct-liquid markers have a reservoir inside the barrel. The reservoir stores ink and also uses capillary action to achieve a slow release and stable supply of ink, making it a key component to ensure continuous ink flow from the pen tip.

[0003] The outer wall of the ink reservoir usually has an axially extending air return groove, which plays a role in balancing the internal and external pressure of the pen barrel and ensuring stable ink flow. However, the air return groove structure of traditional ink reservoirs is simple and the air return volume is limited. When using high-concentration ink, marker pens often experience unstable ink flow and poor coverage due to poor air return. In fact, ink leakage is even prone to occur under negative pressure, which seriously limits the use and application range of marker pens. Utility Model Content

[0004] This invention provides an ink control structure to solve the technical problem of unstable ink output of markers due to poor air return effect of the water reservoir in the prior art.

[0005] To achieve the above objectives, the ink control structure proposed in this application includes a pen barrel, a water reservoir, and a water guide core. The pen barrel contains an ink storage cavity. The water reservoir is disposed within the pen barrel and has a through mounting cavity along its axial direction. An air return groove extending along the axial direction is provided on the outer peripheral wall of the water reservoir, which connects the ink storage cavity to the external environment. The water guide core is fitted and inserted into the mounting cavity, with one end connected to the pen tip and the other end extending into the ink storage cavity. The air return groove includes a first groove section near the pen tip and a second groove section near the ink storage cavity, the width of the second groove section being greater than the width of the first groove section.

[0006] Optionally, in one embodiment, the first groove segment and the second groove segment are connected by a vertical stepped surface, the width of the first groove segment is 0.14mm-0.16mm, and the width of the second groove segment is 0.18mm-0.2mm.

[0007] Optionally, in one embodiment, the water storage device includes a cylinder and a plurality of first partitions and a plurality of second partitions disposed on the cylinder, wherein the first groove segment is disposed on the plurality of first partitions and the second groove segment is disposed on the plurality of second partitions.

[0008] Optionally, in one embodiment, a plurality of first partitions and a plurality of second partitions are respectively arranged at equal intervals on the cylinder, and the distance between two adjacent first partitions is greater than the distance between two adjacent second partitions.

[0009] Optionally, in one embodiment, the distance between two adjacent first spacers is between 0.25mm and 0.35mm, and the distance between two adjacent second spacers is between 0.15mm and 0.25mm.

[0010] Optionally, in one embodiment, the water reservoir further includes an assembly ring integrally disposed at the end of the cylinder away from the pen tip. The outer peripheral wall of the assembly ring is provided with a first opening and a second opening respectively communicating with the second groove segment, and the first opening and the second groove segment are correspondingly disposed in the axial direction of the water reservoir.

[0011] Optionally, in one embodiment, the outer peripheral wall of the water storage device is further provided with a groove, the groove and the air return groove are arranged parallel to and spaced apart on the outer peripheral wall of the water storage device, and the second opening is correspondingly provided with the groove in the axial direction of the water storage device.

[0012] Optionally, in one embodiment, the width of the second opening is 0.15 mm to 0.18 mm.

[0013] Optionally, in one embodiment, the water reservoir has a limiting post at the end away from the pen tip, the limiting post has several water inlets, and the end of the water-guiding core away from the pen tip is installed inside the limiting post.

[0014] This application also proposes a direct-ink marker, which includes the ink control structure described above.

[0015] The ink control structure provided in this application constructs a gradient air return channel by designing the air return groove as a first groove segment near the pen tip and a second groove segment near the ink storage chamber, with the width of the second groove segment being greater than the width of the first groove segment. Compared with the prior art, the wider second groove segment in this application provides a larger gas flow cross-sectional area, enabling more rapid replenishment of external air to the ink storage chamber, significantly improving air return efficiency, effectively balancing the internal and external pressure of the pen barrel, and ensuring that even under high-concentration ink conditions, the ink can still be continuously and evenly delivered to the pen tip through stable capillary action and pressure difference. This overcomes the problems of unstable ink output and insufficient coverage caused by poor air return in traditional structures, resulting in smoother writing and drawing lines and richer colors. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the water storage device provided in this application;

[0018] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 A structural schematic diagram of the water storage device provided in this application from another angle;

[0020] Figure 4 Top view of the water storage device provided in this application;

[0021] Figure 5 A schematic cross-sectional view of the water storage device provided in this application along AA;

[0022] Figure 6 A cross-sectional schematic diagram of the direct-liquid marker provided in this application.

[0023] Explanation of icon numbers:

[0024] 10 pen 22b Second section 262 Second opening 11 Ink storage chamber 23 cylinder 27 groove 20 Water storage 24 First partition 30 water intake core 21 Mounting cavity 25 Second partition 40 written 22 return air trough 26 Assembly ring 50 Limiting post 22a First section 261 First opening 51 Inlet

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] This application provides an ink control structure to solve the technical problem in the prior art where the poor air return effect of the water reservoir leads to unstable ink dispensing in marker pens. The following description is in conjunction with the accompanying drawings.

[0028] In the embodiments of this application, such as Figures 1-2 , Figures 5-6As shown, the ink control structure includes a pen barrel 10, a water reservoir 20, and a water inlet 30. The pen barrel 10 has an ink storage cavity 11 inside. The water reservoir 20 is disposed inside the pen barrel 10 and has a through mounting cavity 21 along its axial direction. The outer peripheral wall of the water reservoir 20 has a return air groove 22 extending along its axial direction, which is used to connect the ink storage cavity 11 with the external environment. The water inlet 30 is adapted to pass through the mounting cavity 21. One end of the water inlet 30 is connected to the pen tip 40, and the other end of the water inlet 30 extends into the ink storage cavity 11. The return air groove 22 includes a first groove section 22a near the pen tip 40 and a second groove section 22b near the ink storage cavity 11. The width of the second groove section 22b is greater than the width of the first groove section 22a.

[0029] It should be noted that the existing technology has a simple air return groove structure and limited air return volume. When using high-concentration ink, the marker pen often suffers from unstable ink output and poor coverage due to poor air return. In fact, it is prone to ink leakage under negative pressure, which seriously limits the use effect and application range of the marker pen.

[0030] To address this, the ink control structure provided in this application designs the air return channel 22 as a first segment 22a near the pen tip 40 and a second segment 22b near the ink storage chamber 11, with the width of the second segment 22b greater than the width of the first segment 22a, thus constructing a gradient air return channel. Compared with the prior art, the wider second segment 22b in this application provides a larger gas flow cross-sectional area, enabling more rapid replenishment of external air to the ink storage chamber 11, significantly improving air return efficiency, effectively balancing the internal and external pressures of the pen barrel 10, and ensuring that even under high-concentration ink conditions, the ink can still be continuously and evenly delivered to the pen tip 40 through stable capillary action and pressure difference. This overcomes the problems of unstable ink output and insufficient coverage caused by poor air return in traditional structures, resulting in smoother writing and drawing lines and richer colors.

[0031] Specifically, such as Figure 6 As shown, the pen barrel 10 adopts a hollow tubular structure design, and the ink reservoir 20 is assembled inside the pen barrel 10 by an interference fit. This design not only effectively fixes the ink reservoir 20, but also significantly improves the sealing performance between the pen barrel 10 and the ink reservoir 20, thereby effectively preventing ink leakage from the fitting gap. On this basis, the ink is delivered in a directional and controllable manner through the ink guide 30, and finally reaches the pen tip 40 precisely, ensuring smooth and stable writing.

[0032] Please see Figures 1-3In this embodiment, the water reservoir 20 has an overall annular structure, typically made of porous plastic or fiber material through an integral molding process. It integrates ink storage, ink guiding, and air pressure regulation functions. An annular mounting cavity 21 is formed inside the water reservoir 20, extending through both ends. The water guide core 30 is assembled into the mounting cavity 21 with an interference fit. The water guide core 30 is preferably made of fiber bundles or sintered material. The axial length of the water guide core 30 is greater than the axial length of the water reservoir 20 to ensure that both ends of the water guide core 30 are located outside the water reservoir 20 after assembly. The front end of the water guide core 30 maintains contact with the pen tip 40 to guide ink to the pen tip 40. The rear end of the water guide core 30 extends into the ink storage cavity 11 to continuously draw ink from the ink storage cavity 11, thereby achieving a stable and continuous delivery of ink from the ink storage cavity 11 to the pen tip 40 through capillary action.

[0033] In this embodiment, the width change between the first groove segment 22a and the second groove segment 22b can be a step-like abrupt change or a smooth transitional conical change. During use, as ink is consumed from the pen tip 40, a slight negative pressure is generated in the ink storage chamber 11. External air first enters through the gap at the head of the pen barrel 10, then flows sequentially through the first groove segment 22a and the second groove segment 22b, and finally reaches the ink storage chamber 11, thereby balancing the internal and external pressures of the pen barrel 10.

[0034] Because the second groove 22b is wider, its airflow resistance is lower, allowing more air to enter the ink reservoir 11 quickly, significantly improving air return efficiency. The narrower width of the first groove 22a not only helps reduce the overall evaporation area of ​​the ink, delaying ink drying and extending the marker's lifespan, but also prevents ink from flowing through the first groove 22a to the pen tip 40, ensuring the marker's writing performance.

[0035] Optionally, in one embodiment, please refer to Figure 2 The first groove segment 22a and the second groove segment 22b are connected by a vertical stepped surface, thus forming an interconnected return air channel with a change in cross-sectional area. This connection method makes the change in groove width abrupt and stepped rather than a smooth transition. This structure is simpler and more precise in mold design and processing, and it is easier to ensure the consistency of mass production.

[0036] The width of the first groove segment 22a is preferably 0.14mm-0.16mm, for example, it can be 0.14mm, 0.15mm, or 0.16mm. The width of the second groove segment 22b is preferably 0.18mm-0.2mm, for example, it can be 0.18mm, 0.19mm, or 0.2mm. It is understood that controlling the width of the first groove segment 22a to 0.14mm-0.16mm effectively limits excessive airflow from impacting the pen tip 40 system while ensuring basic air return functionality. Setting the width of the second groove segment 22b to 0.18mm-0.2mm increases its cross-sectional area by approximately 30%-40% compared to the first groove segment 22a; this significant dimensional difference ensures a substantial improvement in air return capability. This dimensional combination balances optimal performance and manufacturability within the capabilities of existing precision injection molding processes.

[0037] Optionally, in one embodiment, please refer to Figure 1 and Figure 5 The water reservoir 20 includes a cylindrical body 23 and a plurality of first partitions 24 and a plurality of second partitions 25 disposed on the cylindrical body 23. A first groove section 22a is disposed on the plurality of first partitions 24, and a second groove section 22b is disposed on the plurality of second partitions 25. The plurality of first partitions 24 and the plurality of second partitions 25 are independent of each other and are arranged at intervals perpendicular to the axial direction of the water reservoir 20. The plurality of first partitions 24 and the plurality of second partitions 25 can be integrally injection molded with the cylindrical body 23, or they can be assembled onto the cylindrical body 23 as independent components.

[0038] Specifically, a notch is provided on the outer edge of each first partition 24. When multiple first partitions 24 are arranged at a certain interval along the axial direction of the water reservoir 20, the notches on each first partition 24 are aligned axially, thus forming a discontinuous first groove segment 22a. Similarly, a notch is provided on the outer edge of each second partition 25. When multiple second partitions 25 are arranged at a certain interval along the axial direction of the water reservoir 20, the notches on each second partition 25 are aligned axially, thus forming a discontinuous second groove segment 22b. In this embodiment, by setting notches of different sizes on multiple first partitions 24 and multiple second partitions 25, a gradient air return function is achieved, significantly improving the overall writing and drawing experience of the marker.

[0039] Optionally, in one embodiment, please refer to Figures 3-5 Multiple first partitions 24 and multiple second partitions 25 are equally spaced on the cylinder 23, with the distance between two adjacent first partitions 24 being greater than the distance between two adjacent second partitions 25. In other words, the first partitions 24 near the pen tip 40 are more sparsely distributed, while the second partitions 25 near the ink storage cavity 11 are more densely distributed.

[0040] In this embodiment, the spacing between adjacent first partitions 24 is relatively large. This increased spacing provides a relatively spacious cavity for airflow, creating a buffer zone after the air flows through the gaps in each first partition 24. This helps to stabilize the air pressure, making the flow restriction effect gentler and more stable, and preventing the airflow from being too rapid. Conversely, the spacing between adjacent second partitions 25 is smaller, increasing the overall structural rigidity of the water reservoir 20 in this area. Furthermore, due to the wider second groove section 22b, even with the smaller spacing between the second partitions 25, the rapid air return capability remains unaffected.

[0041] Optionally, in one embodiment, the distance between two adjacent first spacers 24 is between 0.25mm and 0.35mm, and the distance between two adjacent second spacers 25 is between 0.15mm and 0.25mm.

[0042] Specifically, by setting the distance between the two first partitions 24 between 0.25mm and 0.35mm, the air intake process near the pen tip 40 is made more stable, avoiding uneven ink output or occasional leakage caused by slight fluctuations in air pressure. If the distance is less than 0.25mm, the buffer space is insufficient, the flow restriction effect is too severe, and it may affect the return air response speed; if the distance is greater than 0.35mm, it may weaken the guidance and stability of the stepped return air channel formed by the openings of multiple partitions.

[0043] In some embodiments, the distance between two adjacent first partitions 24 is 0.3 mm, and the distance between two adjacent second partitions 25 is 0.2 mm. By setting first partitions 24 and second partitions 25 with different density layouts, as well as first grooves and second grooves with different widths, the internal and external air pressures can be effectively balanced, and the risk of marker ink leakage can be reduced.

[0044] Optionally, in one embodiment, please refer to Figures 3-5 The water reservoir 20 also includes an assembly ring 26, which is integrally disposed at the end of the cylinder 23 away from the pen tip 40. The outer peripheral wall of the assembly ring 26 is provided with a first opening 261 and a second opening 262 that communicate with the second groove section 22b respectively, and the first opening 261 and the second groove section 22b are correspondingly disposed in the axial direction of the water reservoir 20.

[0045] Specifically, the assembly ring 26 and the cylinder 23 are integrally formed by injection molding, and the assembly ring 26 is installed with an interference fit to the inner wall of the pen barrel 10. Since one side of the assembly ring 26 is in direct contact with the ink, the interference fit between the assembly ring 26 and the pen barrel 10 can achieve a good sealing effect on the ink in the ink storage chamber 11. The first opening 261 and the second groove segment 22b are axially aligned, allowing airflow to quickly enter the ink storage chamber 11 directly through the first opening 261, shortening the return air path.

[0046] In this embodiment, the second opening 262 increases the total air intake area, allowing more airflow to enter the ink storage chamber 11 simultaneously from both the first opening 261 and the second opening 262. This results in higher air return efficiency, especially during rapid writing or when there are drastic changes in ambient temperature and air pressure, effectively preventing ink supply fluctuations. Furthermore, even when the first opening 261 is blocked, airflow can still enter the ink storage chamber 11 through the second opening 262, significantly improving the product's fault tolerance and overall reliability.

[0047] Optionally, in one embodiment, please refer to Figure 3 The water reservoir 20 is also provided with a groove 27 on its outer peripheral wall. The groove 27 and the air return groove 22 are arranged parallel to each other and spaced apart on the outer peripheral wall of the water reservoir 20. The second opening 262 and the groove 27 are correspondingly arranged in the axial direction of the water reservoir 20.

[0048] Specifically, both the groove 27 and the air return groove 22 can be directly formed by the protruding structure on the mold during the injection molding of the water reservoir 20. The air return groove 22 is a relatively narrow groove on the water reservoir 20, while the groove 27 is a relatively wide groove on the water reservoir 20. The air return groove 22 and the groove 27 are arranged at a circumferential distance of 180° on the water reservoir 20. In this embodiment, the first opening 261 is correspondingly set with the second groove segment 22b of the air return groove 22, and the second opening 262 is correspondingly set with the groove 27. The second groove segment 22b and the groove 27 are connected through the gaps between multiple second partitions 25, thereby constructing two interconnected air return channels. This not only ensures the stability of ink flow during normal writing, but also provides a redundant and rapid pressure balance channel when the ink is consumed rapidly or the ambient temperature and pressure change drastically. It can effectively prevent ink flow interruption caused by internal negative pressure, and significantly improve the environmental adaptability and reliability of the marker under complex conditions.

[0049] Furthermore, the first opening 261 also serves as an ink-drawing function. The ink in the ink storage chamber 11 can permeate through the first opening 261 and be stored in the capillary gap formed between multiple second partitions 25. Even in extreme cases such as rapid writing that cause a sudden surge in ink consumption, the pen tip energy can be continuously supplied with ink, fundamentally avoiding the problem of smudged writing or uneven color due to untimely ink supply.

[0050] Optionally, in one embodiment, the width of the second opening 262 is 0.15 mm to 0.18 mm.

[0051] Understandably, by setting the width of the second opening 262 between 0.15mm and 0.18mm, when a negative pressure is generated inside the ink storage chamber 11, external air can quickly enter the ink storage chamber 11 through the second opening 262, ensuring timely air return response and avoiding ink supply interruption. At the same time, this width utilizes the surface tension and capillary action of the ink to form a reliable capillary lock, and the resistance generated is sufficient to prevent ink from seeping out through the second opening 262 under normal use, effectively preventing ink leakage.

[0052] Optionally, in one embodiment, please refer to Figure 3 and Figure 5 The water reservoir 20 is provided with a limiting post 50 at the end away from the pen tip 40. The limiting post 50 is provided with several water inlets 51. The end of the water guide 30 away from the pen tip 40 is installed in the limiting post 50. The limiting post 50 is used to limit the water guide 30 in the axial direction to prevent the water guide 30 from extending too far into the ink storage cavity 11 and to ensure reliable contact between the water guide 30 and the pen tip 40.

[0053] Specifically, the limiting post 50 can be integrally injection molded with the water reservoir 20. The peripheral wall of the limiting post 50 has two water inlets 51. The two water inlets 51 increase the contact area between the water core 30 and the ink, ensuring a stable supply of ink.

[0054] Furthermore, an inlet 51 is added to the end of the limiting post 50. The diameter of the inlet 51 must be smaller than the outer diameter of the ink guide 30 to prevent the ink guide 30 from extending directly into the ink storage cavity 11 through the inlet 51 during assembly or use, thereby ensuring that the end of the ink guide 30 is always stably confined within the limiting post 50. In this embodiment, the ink in the ink storage cavity 11 can contact the ink guide 30 through multiple inlets 51, significantly increasing the ink supply path and enhancing the stability and reliability of the marker ink supply.

[0055] This application also provides a direct liquid marker, which includes an ink control structure. The specific structure of the ink control structure is as described in the above embodiments. Since this direct liquid marker adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0057] The ink control structure provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An ink control structure, characterized in that, include: The pen barrel has an ink storage cavity inside; A water reservoir is disposed inside the pen barrel. The water reservoir has a through mounting cavity along its axial direction. An air return groove extending along its axial direction is provided on the outer peripheral wall of the water reservoir. The air return groove is used to connect the ink storage cavity with the external environment. A water-guiding core is fitted into the mounting cavity, with one end of the water-guiding core connected to the pen tip and the other end of the water-guiding core extending into the ink storage cavity; The air return groove includes a first groove section near the pen tip and a second groove section near the ink storage cavity, wherein the width of the second groove section is greater than the width of the first groove section.

2. The ink control structure according to claim 1, characterized in that, The first groove segment and the second groove segment are connected by a vertical stepped surface. The width of the first groove segment is 0.14mm-0.16mm, and the width of the second groove segment is 0.18mm-0.2mm.

3. The ink control structure according to claim 1, characterized in that, The water storage device includes a cylinder and a plurality of first partitions and a plurality of second partitions disposed on the cylinder. The first groove segment is disposed on the plurality of first partitions, and the second groove segment is disposed on the plurality of second partitions.

4. The ink control structure according to claim 3, characterized in that, Multiple first partitions and multiple second partitions are equally spaced on the cylinder, and the distance between two adjacent first partitions is greater than the distance between two adjacent second partitions.

5. The ink control structure according to claim 4, characterized in that, The distance between two adjacent first partitions is between 0.25mm and 0.35mm, and the distance between two adjacent second partitions is between 0.15mm and 0.25mm.

6. The ink control structure according to claim 3, characterized in that, The water reservoir also includes an assembly ring, which is integrally disposed at the end of the cylinder away from the pen tip. The outer peripheral wall of the assembly ring is provided with a first opening and a second opening that communicate with the second groove segment respectively, and the first opening and the second groove segment are correspondingly disposed in the axial direction of the water reservoir.

7. The ink control structure according to claim 6, characterized in that, The outer peripheral wall of the water storage device is also provided with a groove, which is parallel to and spaced apart from the air return groove on the outer peripheral wall of the water storage device, and the second opening is corresponding to the groove in the axial direction of the water storage device.

8. The ink control structure according to claim 7, characterized in that, The width of the second opening is 0.15mm to 0.18mm.

9. The ink control structure according to claim 1, characterized in that, The water reservoir has a limiting post at the end away from the pen tip, and the limiting post has several water inlets. The end of the water-guiding core away from the pen tip is installed inside the limiting post.

10. A direct-liquid marker, characterized in that, Includes the ink control structure as described in any one of claims 1-9.

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