A writing tool

Abstract

The present invention relates to a graffiti tool, comprising a graffiti head, a buffer body connected to the outside atmosphere, a gas-liquid exchanger and a liquid storage tube for supplying liquid to the gas-liquid exchanger, wherein the gas-liquid exchanger has a water-introducing core, a liquid-sealing tube coated on the outer peripheral wall of the water-introducing core and a gas-liquid channel arranged between the water-introducing core and the liquid-sealing tube; the buffer body is coated on the outer peripheral wall of the liquid-sealing tube, and the capillary pressure of the liquid-sealing tube is more than 30% greater than the capillary pressure of the buffer body. The graffiti tool of the present invention can effectively control the release of liquid and prevent liquid leakage; it has a simple structure, smooth release and is easy to manufacture.

Description

Technical Field

[0001] The invention relates to a writing tool, in particular to the technical field of controlling the release of various liquids in writing tools and cosmetics. Background Art

[0002] In the technical field of controlling liquid release, porous materials have been widely used. For example, in markers, porous materials are used as materials for absorbing and containing liquids. In the prior art, the most commonly used porous material is a roll core formed by wrapping a fiber bundle with a film. When in use, it is inserted into a shell and a writing head. The two ends of the roll core are connected to the atmosphere so that when liquid is injected, air is discharged to the two ends and liquid is diffused to the two ends, which is also convenient for liquid release. However, the liquid output of the roll core will gradually decrease with the increase of use time, and the roll core has the disadvantage of a large amount of residual liquid.

[0003] In the technical field of controlling liquid release, another commonly used technology is to use a water-conducting core to conduct liquid and use a fin group to control liquid release, which is suitable for applications with small ink output, such as water-based ballpoint pens. This technology combining a water-conducting core and a fin group requires very high manufacturing precision. When there is a slight quality fluctuation in the parts or when encountering abnormal environmental changes such as temperature difference and pressure difference, the liquid is easy to leak. Patent document with application number 201510018984.0 discloses a direct liquid writing device, which sets an adjustment part between the ink tube and the pen head, and uses a very precise interval in the adjustment part to control the ink release. This liquid release technology solves the problem of roll-wrapped core-type writing tools well and is conducive to the application of large liquid output, but the design of the adjustment part is relatively complex, and the interval size control in the adjustment part requires extremely precise control, and the manufacturing cost is relatively high. In these two technologies, because the pen head is far away from the ink tube and only the water-conducting core is used to conduct liquid between the two, the common defect is that if the pen head is placed upward for a period of time or the pen head is used upward, it is easy to cause the pen head part to lack ink and affect the function. Summary of the invention

[0004] In order to solve the problems existing in traditional roll-wrapped writing tools and some existing direct liquid writing tools, the present invention proposes a writing tool, including a writing head, a buffer body connected to the outside atmosphere, a gas-liquid exchanger and a liquid storage tube for supplying liquid to the gas-liquid exchanger, the gas-liquid exchanger has a water guide core, a liquid sealing tube coated on the outer peripheral wall of the water guide core and a gas-liquid channel arranged between the water guide core and the liquid sealing tube; the buffer body is coated on the outer peripheral wall of the liquid sealing tube, and the capillary pressure of the liquid sealing tube is more than 30% greater than the capillary pressure of the buffer body.

[0005] Furthermore, a groove is arranged on the outer peripheral wall of the water guide core, and a gas-liquid channel is formed between the groove and the inner peripheral wall of the liquid sealing tube.

[0006] Furthermore, the liquid sealing tube is made of a porous material.

[0007] Furthermore, when the gas-liquid channel is used as the gas-conducting channel, the maximum inscribed circle diameter of the cross section of the gas-conducting channel is 0.1-0.8 mm.

[0008] Furthermore, the buffer body is made of porous material.

[0009] Furthermore, the water guide core passes through the lower end of the liquid sealing tube and is connected with the writing head.

[0010] Furthermore, a sleeve is provided at the bottom of the liquid storage tube.

[0011] Furthermore, a protective body is provided below the gas-liquid exchanger, and the capillary pressure of the protective body is not greater than the capillary pressure of the buffer body.

[0012] Furthermore, the buffer body and the liquid sealing tube are integrally formed, and the outer peripheral wall of the liquid sealing tube and the inner peripheral wall of the buffer body are bonded.

[0013] Furthermore, the writing head is inserted into the gas-liquid exchanger and connected to a part of the inner wall of the liquid sealing tube.

[0014] According to the technical solution of the present invention, the liquid release can be effectively controlled, the liquid discharge is smooth and stable, and the liquid leakage under abnormal conditions can be effectively prevented; the structure is simple and the manufacturing is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation modes of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1a is a schematic structural diagram of a writing tool according to a first embodiment of the present invention;

[0017] Figure 1b is along Figure 1a Schematic diagram of the cross section of section AA;

[0018] Figure 2a is a schematic structural diagram of a writing tool according to a second embodiment of the present invention;

[0019] Figure 2b is along Figure 2a Schematic cross-sectional view of the middle BB section;

[0020] Figure 3a is a schematic structural diagram of a writing tool according to a third embodiment of the present invention;

[0021] Figure 3b is along Figure 3a Schematic cross-sectional view of the CC section;

[0022] Figure 4a is a schematic structural diagram of a writing tool according to a fourth embodiment of the present invention;

[0023] Figure 4b is along Figure 4a Schematic cross-sectional view of the middle DD section;

[0024] Figure 5a is a schematic structural diagram of a writing tool according to a fifth embodiment of the present invention;

[0025] Figure 5b is along Figure 5a Schematic cross-sectional view of the EE section;

[0026] Figure 6a is a schematic structural diagram of a writing tool according to a sixth embodiment of the present invention;

[0027] Figure 6b is along Figure 6a Schematic cross-sectional view of section GG. DETAILED DESCRIPTION

[0028] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description.

[0029] In addition, the terms "upper", "lower", "front" and "rear" used in the following description should not be construed as limiting the present invention. In the present invention, "lower" and "front" refer to one end of the writing head 1, and "upper" and "rear" refer to one end of the liquid storage tube.

[0030] The normal conditions or conditions not specifically mentioned in the present invention generally refer to the conditions of room temperature and standard atmospheric pressure, and the abnormal conditions refer to the conditions where the external temperature or pressure deviates from the normal conditions. The capillary pressure P in the present invention is defined as the pressure generated by the liquid rising to a height h when a porous body (liquid seal tube or buffer body) of sufficient length (generally 2-15 cm) is placed vertically for 30 minutes with one end just touching the horizontal liquid surface under normal conditions.

[0031] P=ρgh,

[0032] Where ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the liquid rising.

[0033] The test method of the liquid rising height h is defined as follows in the present invention:

[0034] 1) Place a porous body with a length of H into a liquid and absorb the liquid until it is saturated, and test its saturated liquid absorption weight W0.

[0035] 2) Use the same porous body and the same liquid, place one end of the porous body just in contact with the liquid surface and place it vertically for 30 minutes, and test its liquid absorption weight as W.

[0036] 3) Calculate the h value as: h = (W / W0) x H

[0037] As shown in Figures 1 to 6, the writing tool according to the present invention includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0038] <Gas-Liquid Exchanger>

[0039] According to the writing tool of the present invention, the gas-liquid exchanger 3 comprises a water-introducing core 31, a liquid-sealing tube 32 wrapped on the outer peripheral wall of the water-introducing core 31, and a gas-liquid channel 30 arranged between the water-introducing core 31 and the liquid-sealing tube 32.

[0040] <Water diversion core>

[0041] The water guide core 31 of the present invention can be made of fibers bonded together, such as polyester fibers, acrylic fibers, etc. In addition, a groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31, extending from one end to the other end, as the gas-liquid channel 30. When only one groove is provided, the groove serves as an air guide channel for conducting the air path to the liquid storage tube 4, and the water guide core 31 serves as a liquid guide channel for transmitting liquid from the liquid storage tube 4 to the writing head 1. When multiple grooves are provided, some of the grooves can also serve as liquid guide channels for transmitting liquid from the liquid storage tube 4 to the writing head 1.

[0042] The water guide core 31 in the present invention can also be made of plastic whose surface can be wetted by liquid, such as polyformaldehyde, nylon, etc. The plastic water guide core 31 needs to have two or more grooves on its surface as the gas-liquid channel 30, wherein at least one groove serves as an air guide channel for conducting air to the liquid storage tube 4, and the other grooves serve as liquid guide channels for transmitting liquid from the liquid storage tube 4 to the writing head 1.

[0043] <Liquid seal tube>

[0044] The liquid sealing tube 32 of the present invention is made of porous material. The porous material made of the liquid sealing tube 32 can be a filter membrane or fiber. The wall thickness of the liquid sealing tube 32 is 0.1-5mm, such as 0.1mm, 0.5mm, 1mm, 2mm, 5mm. The liquid sealing tube 32 with a thinner wall thickness can be made of a filter membrane, and the liquid sealing tube 32 with a thicker wall thickness can be made by bonding single-component fibers or double-component fibers. The thinner-walled liquid sealing tube 32 has a small capacity for liquid, which is conducive to more fully utilizing and releasing the liquid and reducing the residual amount; the thicker-walled liquid sealing tube 32 has a large capacity for liquid, which is conducive to retaining more liquid in the gas-liquid exchanger 3, and has good liquid release performance even when the writing head 1 is used upward.

[0045] The liquid sealing tube 32 is coated on the outer peripheral wall of the water guide core 31. The liquid sealing tube 32 can be partially coated on the outer peripheral wall of the water guide core 31, or can be fully coated on the outer peripheral wall of the water guide core 31. The coated area can be reasonably selected according to the design requirements.

[0046] After absorbing a certain amount of liquid, the liquid seal tube 32 prevents gas from passing through the liquid seal tube 32 in the radial direction, thereby isolating the water guide core 31 and the gas-liquid channel 30 from the buffer body 2. In this case, the liquid storage tube 4 and the outside world can only exchange gas through the gas-liquid channel 30, but cannot exchange gas from the buffer body 2 through the liquid seal tube 32. After absorbing liquid, the gas-liquid channel 30 is formed between the inner wall of the liquid seal tube 32 and the grooves on the water guide core 31 and its surface, and most of the space in the gas-liquid channel 30 is filled with liquid, so that the gas guide channel 30 is sealed into multiple sections of small bubbles. When the liquid is discharged from the liquid storage tube 4 through the gas-liquid exchanger 3, the pressure difference between the liquid storage tube 4 and the outside world increases, pushing the bubbles in the gas-liquid channel 30 to move toward the liquid storage tube 4 and enter the liquid storage tube 4, so that the pressure difference between the liquid storage tube 4 and the outside world is reduced until it is balanced, and at the same time, new liquid seal sections and small bubbles are formed in the gas-liquid channel 30. The capillary pressure of the liquid sealing tube 32 is greater than the capillary pressure of the buffer body 2 by more than 30%, so that it is difficult for the buffer body 2 to absorb liquid from the liquid sealing tube 32 under normal circumstances.

[0047] <Gas-Liquid Exchanger>

[0048] The gas-liquid exchanger 3 of the present invention comprises a water guide core 31 and a liquid sealing tube 32 , and all or part of the outer peripheral wall of the water guide core 31 is covered by the liquid sealing tube 32 .

[0049] The groove on the outer wall of the water guide core 31 of the gas-liquid exchanger 3 and the inner wall of the liquid sealing tube 32 form a gas-liquid channel 30, and are connected to the ambient atmosphere. According to the use requirements of the graffiti tool and the properties of the liquid therein, when the gas-liquid channel 30 is used as an air guide channel, the maximum inscribed circle diameter of the cross section of the air guide channel is 0.1-0.8mm. Air guide channels with different maximum inscribed circle diameters have different capillary forces to control the liquid sealing strength during air conduction. If the maximum inscribed circle diameter is smaller, the air conduction amount is small, which is suitable for graffiti tools with a small liquid output; if the maximum inscribed circle diameter is larger, the air conduction amount is large, which is suitable for graffiti tools with a large liquid output.

[0050] The gas-liquid exchanger 3 is also provided with a liquid conducting channel. The water conducting core 31 made of fiber can be used as the liquid conducting channel itself; the grooves on the surface of the water conducting core 31 or the grooves and the inner wall of the liquid sealing tube 32 can also form a liquid conducting channel. When the liquid used in the writing tool contains larger particles, such as pearlescent ink or metallic ink, the liquid conducting channel with grooves is particularly important, because the ordinary water conducting core 31 without grooves will filter all or part of the particles in the liquid.

[0051] <Buffer>

[0052] The buffer body 2 is coated on the outer peripheral wall of the liquid sealing tube 32 , and the capillary pressure of the liquid sealing tube 32 is greater than the capillary pressure of the buffer body 2 by more than 30%.

[0053] The buffer body 2 may partially cover the outer peripheral wall of the liquid sealing tube 32 , and preferably completely cover the outer peripheral wall of the liquid sealing tube 32 .

[0054] The buffer body 2 of the present invention is made of a porous material and is connected to the ambient atmosphere. The porous material of the buffer body 2 can be sponge or fiber, and the length and wall thickness of the buffer body 2 can be set according to the internal space of the writing tool. The buffer body 2 with appropriate capillary pressure is manufactured according to the liquid used in the writing tool and the use requirements.

[0055] The capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2, and under normal conditions, the buffer body 2 hardly absorbs liquid from the liquid seal tube 32. The inner wall of the buffer body 2 is connected to the outer wall of the liquid seal tube 32. If an abnormal condition occurs and the liquid content in the liquid seal tube 32 is too high, the buffer body 2 absorbs the excess liquid in the liquid seal tube 32, which can prevent the liquid from leaking from the writing head 1. When the abnormal condition disappears, the liquid in the buffer body 2 is returned to the liquid seal tube 32 and returns to the liquid storage tube 4 through the liquid guide channel. In order to make the buffer body 2 have the above-mentioned properties, the density of the buffer body 2 is 0.03-0.20 g / cm 3 If the buffer body 2 is made of fiber, the fiber fineness is preferably 0.5-30 denier.

[0056] <Scribble Head>

[0057] The writing head 1 of the present invention can be connected to the water guide core 31 passing through the liquid sealing tube 32, or can be inserted into the gas-liquid exchanger 3 and connected to part of the inner wall of the liquid sealing tube 32. The water guide core 31 can also be extended to serve as the writing head 1.

[0058] <Reservoir tube>

[0059] In the graffiti tool of the present invention, the liquid storage tube 4 is a component for storing liquid. The bottom of the liquid storage tube 4 can be provided with an upward or downward sleeve 62, and the sleeve 62 is inserted into the gas-liquid exchanger 3 and is in close contact with the inner wall of the liquid sealing tube 32, or the liquid sealing tube 32 and the water guide core 31 are inserted into the sleeve 62, which is conducive to fixing the gas-liquid exchanger 3 and preventing liquid leakage. A replaceable liquid storage tube 4 can be used, which is conducive to reusing components such as the housing 6 and reducing resource waste. The replaceable liquid storage tube 4 can be connected to the graffiti tool in a variety of ways such as screw connection and clamping.

[0060] First embodiment

[0061] Figure 1a is a schematic structural diagram of a writing tool according to a first embodiment of the present invention; Figure 1b is along Figure 1a Schematic diagram of the cross section of section AA. Figure 1a and Figure 1b As shown, the writing tool according to the first embodiment includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3.

[0062] The gas-liquid exchanger 3 comprises a water-introducing core 31, a liquid-sealing tube 32 wrapped on the outer peripheral wall of the water-introducing core 31, and a gas-liquid channel 30 arranged between the water-introducing core 31 and the liquid-sealing tube 32;

[0063] The buffer body 2 is coated on the outer peripheral wall of the liquid sealing tube 32 , and the capillary pressure of the liquid sealing tube 32 is greater than the capillary pressure of the buffer body 2 by more than 30%.

[0064] According to the writing tool of this embodiment, the liquid sealing tube 32 is completely covered on the outer peripheral wall of the water guide core 31, one end of the water guide core 31 extends out of the upper end of the liquid sealing tube 32 and is inserted into the liquid storage tube 4, and the other end passes through the lower end of the liquid sealing tube 32 and is connected to the writing head 1. In this embodiment, the water guide core 31 is abutted against the writing head 1.

[0065] The liquid sealing tube 32 is a filter membrane or bonding fiber, and the buffer body 2 is a sponge or bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is completely covered by the buffer body 2.

[0066] The writing tool according to this embodiment further comprises a housing 6 and a partition 61. The liquid storage tube 4 is integrally arranged in the housing 6, and the partition 61 also serves as the bottom of the liquid storage tube 4. The partition 61 is provided with a through hole for inserting the water guide core 31.

[0067] According to the graffiti tool of this embodiment, a sleeve 62 extending downward is provided at the bottom of the liquid storage tube 4, and the sleeve 62 is coaxially arranged with the through hole for inserting the water guide core 31 provided on the partition 61, and has the same inner diameter. During assembly, the sleeve 62 can be inserted between the liquid sealing tube 32 and the water guide core 31, and the outer peripheral wall of the sleeve 62 is tightly matched with the inner peripheral wall of the liquid sealing tube 32, so as to facilitate reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3.

[0068] The lower part of the housing 6 may be integrally provided with a graffiti head holder 10 for mounting the graffiti head 1. The graffiti head holder 10 may also be formed separately and then detachably mounted on the lower part of the housing 6.

[0069] Second embodiment

[0070] Figure 2a is a schematic structural diagram of a writing tool according to a second embodiment of the present invention; Figure 2b is along Figure 2a The structure of this embodiment is similar to that of the first embodiment, and the same parts as those of the first embodiment will not be repeated in the description of this embodiment.

[0071] like Figure 2a and Figure 2b As shown, the graffiti tool according to the second embodiment includes a graffiti head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0072] According to the writing tool of this embodiment, the liquid sealing tube 32 is completely covered on the outer peripheral wall of the water guide core 31, one end of the water guide core 31 extends out of the liquid sealing tube 32 and is inserted into the liquid storage tube 4, and the other end passes through the liquid sealing tube 32 and is inserted into the writing head 1.

[0073] A groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31 extending from one end to the other end as the gas-liquid channel 30. In this embodiment, the number of grooves is set to 3. The maximum inscribed circle diameter of the groove is preferably 0.5 mm. In this embodiment, the water guide core 31 is preferably made of bonding fiber or plastic.

[0074] The liquid sealing tube 32 is preferably made of bonding fiber, and the wall thickness of the liquid sealing tube 32 is preferably 0.5 mm. The buffer body 2 is preferably made of sponge or bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is completely covered by the buffer body 2.

[0075] The writing tool according to this embodiment further comprises a housing 6 and a partition 61. The liquid storage tube 4 is integrally arranged in the housing 6, and the partition 61 also serves as the bottom of the liquid storage tube 4. The partition 61 is provided with a through hole for inserting the water guide core 31.

[0076] According to the graffiti tool of this embodiment, a sleeve 62 extending downward is provided at the bottom of the liquid storage tube 4, and the sleeve 62 is coaxially arranged with the through hole for inserting the water guide core 31 provided on the partition 61, and has the same inner diameter. During assembly, the sleeve 62 can be inserted between the liquid sealing tube 32 and the water guide core 31, and the outer peripheral wall of the sleeve 62 is tightly matched with the inner peripheral wall of the liquid sealing tube 32, so as to facilitate reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3.

[0077] According to the writing tool of this embodiment, a protective body 5 is arranged below the gas-liquid exchanger 3 , and the capillary pressure of the protective body 5 is not greater than the capillary pressure of the buffer body 2 .

[0078] In this embodiment, the other end of the water guide core 31 passes through the liquid sealing tube 32 and then passes through the protection body 5 , and then is inserted into the writing head 1 .

[0079] In extreme abnormal situations, such as carrying a graffiti tool from a low altitude area to a high altitude area, or opening a graffiti tool on a high-altitude airplane, the extreme pressure difference between the inside and outside of the liquid storage tube 4 causes the liquid rapidly discharged from the liquid storage tube 4 to not be absorbed by the buffer body 2 in time and leak. In this case, the protective body 5 can absorb the liquid rapidly escaping from the gas-liquid exchanger 3. After the abnormal situation is eliminated, the liquid temporarily stored in the protective body 5 will be transferred to the graffiti head 1 through the water guide core 31 or absorbed by the liquid seal tube 32.

[0080] The graffiti tool according to this embodiment can be applied to eyeliners. According to the graffiti tool according to this embodiment, since the number of grooves serving as the gas-liquid channel 30 is 3, at least one of which can serve as a liquid guide channel, particles in the eyeliner liquid can be transported to the graffiti head 1 through the grooves without being filtered out by the water guide core 31.

[0081] Third embodiment

[0082] Figure 3a is a schematic structural diagram of a writing tool according to a third embodiment of the present invention; Figure 3b is along Figure 3a The structure of this embodiment is similar to that of the first embodiment, and the same parts as those of the first embodiment will not be repeated in the description of this embodiment.

[0083] like Figure 3a and Figure 3bAs shown, according to the third embodiment, the writing tool includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0084] According to the writing tool of this embodiment, the outer peripheral wall of the water guide core 31 is completely covered by the liquid sealing tube 32, one end of the water guide core 31 extends out of the liquid sealing tube 32 and is inserted into the liquid storage tube 4, and the other end passes through the liquid sealing tube 32 and extends out of the outer shell 6.

[0085] A groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31 extending from one end to the other end as the gas-liquid channel 30. In this embodiment, the number of grooves is set to 1. The maximum inscribed circle diameter of the groove is preferably 0.3 mm. In this embodiment, the water guide core 31 is preferably a bonding fiber.

[0086] The writing tool according to this embodiment further comprises a housing 6 and a partition 61. The liquid storage tube 4 is integrally arranged in the housing 6, and the partition 61 also serves as the bottom of the liquid storage tube 4. The partition 61 is provided with a through hole for inserting the water guide core 31.

[0087] According to the graffiti tool of this embodiment, a sleeve 62 extending downward is provided at the bottom of the liquid storage tube 4, and the sleeve 62 is coaxially arranged with the through hole for inserting the water guide core 31 provided on the partition 61, and has the same inner diameter. During assembly, the sleeve 62 can be inserted between the liquid sealing tube 32 and the water guide core 31, and the outer peripheral wall of the sleeve 62 is tightly matched with the inner peripheral wall of the liquid sealing tube 32, so as to facilitate reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3.

[0088] The liquid sealing tube 32 is preferably made of bonding fiber, and the wall thickness of the liquid sealing tube 32 is preferably 1 mm. The liquid sealing tube 32 abuts against the bottom of the liquid storage tube 4, that is, against the partition plate 61.

[0089] The buffer body 2 is preferably sponge or bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is completely covered by the buffer body 2. The buffer body 2 and the liquid sealing tube 32 are preferably integrally formed, and the outer peripheral wall of the liquid sealing tube 32 and the inner peripheral wall of the buffer body 2 are bonded.

[0090] In this embodiment, the portion of the water-inducing core 31 extending out of the housing 6 is formed into the writing head 1 , that is, the writing head 1 and the water-inducing core 31 are formed integrally.

[0091] Fourth embodiment

[0092] Figure 4ais a schematic structural diagram of a writing tool according to a fourth embodiment of the present invention; Figure 4b is along Figure 4a The structure of this embodiment is similar to that of the first embodiment, and the same parts as those of the first embodiment will not be repeated in the description of this embodiment.

[0093] like Figure 4a and Figure 4b As shown, the writing tool according to the fourth embodiment includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; and the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0094] According to the writing tool of this embodiment, the liquid sealing tube 32 is completely covered on the outer peripheral wall of the water guide core 31. A groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31 extending from one end to the other end as the gas-liquid channel 30. In this embodiment, the number of grooves is set to 3. The maximum inscribed circle diameter of the groove is preferably 0.1 mm.

[0095] In this embodiment, the water guide core 31 is preferably made of polyoxymethylene plastic.

[0096] The liquid sealing tube 32 is preferably a filter membrane, and the wall thickness of the liquid sealing tube 32 is preferably 0.1 mm. The buffer body 2 is preferably sponge or bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is completely covered by the buffer body 2.

[0097] The writing tool according to this embodiment further comprises a housing 6 and a partition 61. The liquid storage tube 4 is integrally arranged in the housing 6, and the partition 61 also serves as the bottom of the liquid storage tube 4. The partition 61 is provided with a through hole for inserting the water guide core 31.

[0098] According to the writing tool of this embodiment, a sleeve 62 extending toward the inside of the liquid storage tube 4 is provided at the bottom of the liquid storage tube 4, and the sleeve 62 and the through hole for inserting the water guide core 31 provided on the partition 61 are coaxially arranged and have the same inner diameter.

[0099] The water guide core 31 and one end of the liquid sealing tube 32 extend out of the buffer body 2 together and are inserted into the sleeve 62 in the liquid storage tube 4 .

[0100] The other end of the water guide core 31 passes through the liquid sealing tube 32 and is inserted into the writing head 1 . The tip of the writing head 1 is provided with a ball 11 . The water guide core 31 preferably abuts against the ball 11 .

[0101] During assembly, the water guide core 31 and one end of the liquid sealing tube 32 are inserted into the sleeve 62 in the liquid storage tube 4, and the inner circumferential wall of the sleeve 62 is tightly matched with the outer circumferential wall of the liquid sealing tube 32, thereby facilitating reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3.

[0102] The writing tool according to this embodiment can be used as a device with a small liquid output, such as a ballpoint pen.

[0103] Fifth embodiment

[0104] Figure 5a is a schematic structural diagram of a writing tool according to a fifth embodiment of the present invention; Figure 5b is along Figure 5a The structure of this embodiment is similar to that of the first embodiment, and the same parts as those of the first embodiment will not be repeated in the description of this embodiment.

[0105] like Figure 5a and Figure 5b As shown, the writing tool according to the fifth embodiment includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; and the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0106] According to the writing tool of this embodiment, the liquid sealing tube 32 is completely covered on the outer peripheral wall of the water guide core 31, one end of the water guide core 31 extends out of the liquid sealing tube 32 and is inserted into the liquid storage tube 4, and the other end passes through the liquid sealing tube 32 and is inserted into the writing head 1.

[0107] A groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31 extending from one end to the other end as the gas-liquid channel 30. In this embodiment, the number of grooves is set to 5. Among them, the maximum inscribed circle diameter of two grooves is preferably 0.8 mm, and the maximum inscribed circle diameter of the other three grooves is preferably 0.5 mm.

[0108] The liquid sealing tube 32 is preferably made of bonding fiber, and the wall thickness of the liquid sealing tube 32 is preferably 5 mm. The buffer body 2 is preferably made of bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is completely covered by the buffer body 2.

[0109] The writing tool according to this embodiment further includes a housing 6 and a partition 61, and a through hole for inserting the water guide core 31 is provided on the partition 61. A lower sleeve 621 extending downward is provided at the bottom of the partition 61, and the lower sleeve 621 is coaxially arranged with the through hole for inserting the water guide core 31 provided on the partition 61 and has the same inner diameter. An upper sleeve 622 extending toward the inside of the liquid storage tube 4 is provided at the top of the partition 61, and the inner diameter of the upper sleeve 622 is slightly larger than the inner diameter of the through hole for inserting the water guide core 31 provided on the partition 61.

[0110] According to the graffiti tool of this embodiment, the liquid storage tube 4 is a replaceable liquid storage tube 4. The liquid storage tube 4 is provided with an insertion port 41. During assembly, the insertion port 41 of the liquid storage tube 4 is engaged with the upper sleeve 622 of the partition 61 to form a liquid seal. The lower sleeve 621 can be inserted between the liquid seal tube 32 and the water guide core 31, and the outer peripheral wall of the lower sleeve 621 is tightly matched with the inner peripheral wall of the liquid seal tube 32, thereby facilitating reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3, and easy replacement of the liquid storage tube 4.

[0111] The writing tool according to this embodiment can be applied to a device with a large liquid output, such as a brush.

[0112] Sixth embodiment

[0113] Figure 6a is a schematic structural diagram of a writing tool according to a sixth embodiment of the present invention; Figure 6b is along Figure 6a The structure of this embodiment is similar to that of the first embodiment, and the same parts as those of the first embodiment will not be repeated in the description of this embodiment.

[0114] like Figure 6a and Figure 6b As shown, the writing tool according to the sixth embodiment includes a writing head 1, a buffer body 2 connected to the outside atmosphere, a gas-liquid exchanger 3 and a liquid storage tube 4 for supplying liquid to the gas-liquid exchanger 3, the gas-liquid exchanger 3 has a water guide core 31, a liquid seal tube 32 coated on the outer peripheral wall of the water guide core 31 and a gas-liquid channel 30 arranged between the water guide core 31 and the liquid seal tube 32; and the buffer body 2 is coated on the outer peripheral wall of the liquid seal tube 32, and the capillary pressure of the liquid seal tube 32 is more than 30% greater than the capillary pressure of the buffer body 2.

[0115] According to the writing tool of this embodiment, the liquid sealing tube 32 is partially covered on the outer peripheral wall of the water guide core 31, one end of the water guide core 31 extends out of the liquid sealing tube 32 and is inserted into the liquid storage tube 4, and the other end is located inside the liquid sealing tube 32, and the distance between it and the bottom end surface of the liquid sealing tube 32 is approximately one-fourth of the axial height of the liquid sealing tube 32.

[0116] A groove is provided on the outer peripheral wall of the water guide core 31, and the groove and the inner peripheral wall of the liquid sealing tube 32 form a gas-liquid channel 30. That is, one or more grooves are provided on the outer peripheral wall of the water guide core 31 extending from one end to the other end as the gas-liquid channel 30. In this embodiment, the number of grooves is set to 3. The maximum inscribed circle diameter of the groove is preferably 0.2 mm. In this embodiment, the water guide core 31 is preferably a bonding fiber.

[0117] The liquid sealing tube 32 is preferably made of bonding fiber, and the wall thickness of the liquid sealing tube 32 is preferably 0.5 mm. The buffer body 2 is preferably made of bonding fiber. The outer peripheral wall of the liquid sealing tube 32 is bonded to the inner peripheral wall of the buffer body 2.

[0118] The writing tool according to this embodiment further comprises a housing 6 and a partition 61. The liquid storage tube 4 is integrally arranged in the housing 6, and the partition 61 also serves as the bottom of the liquid storage tube 4. The partition 61 is provided with a through hole for inserting the water guide core 31.

[0119] According to the graffiti tool of this embodiment, a sleeve 62 extending downward is provided at the bottom of the liquid storage tube 4, and the sleeve 62 is coaxially arranged with the through hole for inserting the water guide core 31 provided on the partition 61, and has the same inner diameter. During assembly, the sleeve 62 can be inserted between the liquid sealing tube 32 and the water guide core 31, and the outer peripheral wall of the sleeve 62 is tightly matched with the inner peripheral wall of the liquid sealing tube 32, so as to facilitate reliable assembly between the liquid storage tube 4 and the gas-liquid exchanger 3.

[0120] In this embodiment, the writing head 1 is inserted into the gas-liquid exchanger 3 and connected to a part of the inner wall of the liquid sealing tube 32. The rear end of the writing head 1 is provided with an integrally formed cylindrical, square column or conical insertion portion, which is inserted into the liquid sealing tube 32 and abuts against or is close to the water guide core 31. Preferably, a groove is formed on the outer peripheral wall of the insertion portion to form an air guide channel.

[0121] like Figure 6b As shown, according to the writing tool of this embodiment, the shell 6 and the buffer body 2 can be set to have an elliptical cross-section, which can be applied to fluorescent pens with medium liquid output, etc.

[0122] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention. The graffiti tools of the present invention generally refer to devices used for writing and painting in office supplies, various liquid application devices used in the fields of makeup, etc.

Claims

1. A writing tool, comprising a writing head (1), a buffer body (2) connected to the outside atmosphere, a gas-liquid exchanger (3) and a liquid storage tube (4) for supplying liquid to the gas-liquid exchanger (3), characterized in that: The gas-liquid exchanger (3) comprises a water guide core (31), a liquid sealing tube (32) coated on the outer peripheral wall of the water guide core (31), and a gas-liquid channel (30) arranged between the water guide core (31) and the liquid sealing tube (32); and The buffer body (2) is only coated on the outer peripheral wall of the liquid sealing tube (32), and the capillary pressure of the liquid sealing tube (32) is greater than the capillary pressure of the buffer body (2) by more than 30%; A groove is provided on the outer peripheral wall of the water guide core (31), and a gas-liquid channel (30) is formed between the groove and the inner peripheral wall of the liquid sealing tube (32).

2. A writing tool as claimed in claim 1, characterized in that: The liquid sealing tube (32) is made of porous material.

3. A writing tool as claimed in claim 2, characterized in that: When the gas-liquid channel (30) is used as an air-conducting channel, the maximum inscribed circle diameter of the cross section of the air-conducting channel is 0.1-0.8 mm.

4. A writing tool as claimed in claim 1, characterized in that: The buffer body (2) is made of porous material.

5. A writing tool as claimed in claim 1, characterized in that: The water guide core (31) passes through the lower end of the liquid sealing tube (32) and is connected to the writing head (1).

6. A writing tool as claimed in claim 1, characterized in that: A sleeve (62) is arranged at the bottom of the liquid storage tube (4).

7. A writing tool as claimed in claim 1, characterized in that: A protective body (5) is arranged below the gas-liquid exchanger (3), and the capillary pressure of the protective body (5) is not greater than the capillary pressure of the buffer body (2).

8. A writing tool as claimed in claim 1, characterized in that: The buffer body (2) and the liquid sealing tube (32) are integrally formed, and the outer peripheral wall of the liquid sealing tube (32) and the inner peripheral wall of the buffer body (2) are bonded.

9. A writing tool as claimed in claim 1, characterized in that: The smear head (1) is inserted into the gas-liquid exchanger (3) and connected to a part of the inner wall of the liquid sealing tube (32).

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