Open type air pressurization pen refill and pen

Abstract

The utility model relates to the technical field of writing and drawing pens, in particular to an open type air pressurization pen refill and pen, which are characterized by comprising a pen refill tube filled with printing ink, and further comprising an elastic probe valve assembly which is movably arranged at the head of the pen refill tube in a telescopic mode and used for opening and closing the head of the pen refill tube, the ink flows out or is blocked; the elastic air compression assembly is arranged at the tail of the refill tube, and when the head of the refill tube is opened, the elastic air compression assembly is used for compressing the elastic air compression assembly so as to externally press ink in the refill tube; a capillary flow guide hole is formed in the side wall of the refill tube and / or the elastic air compression assembly in a penetrating mode, the hole diameter of the capillary flow guide hole is smaller than the cross section area of an inner cavity of the refill tube, and when the refill tube is closed, the elastic air compression assembly returns to a natural shape from a compressed state through the capillary flow guide hole. The problem that the ink outlet amount is uncontrollable can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of writing and drawing tools, in particular to an open - type air - pressurized pen core and a writing tool. Background Art

[0002] An ink pen is a tool for writing and drawing using oil - based ink, which is usually used in scenarios such as art creation, education and office work, professional drawing, etc. With the development of technology and the expansion of the creative industry, the usage demand of users for ink pens is gradually increasing. Ink pens still maintain an irreplaceable importance in multiple fields and have great development prospects.

[0003] Currently, in the prior art, there are pens using high - viscosity special inks, such as jelly pens, paint pens, and correction pens. Different types of pens play important roles under different usage conditions. However, due to the poor fluidity of high - viscosity inks, the pen bodies of such ink pens are usually made of soft plastics, and the ink is extruded by squeezing the pen body. There are also many similar structures. For example, the Chinese invention patent with the publication number CN106313940A discloses a pen core with high ink utilization rate. Among them, by pressing a simple air - compression structure, the air pressure inside the core is increased to push the remaining ink inside the core to continue flowing out, and the ink inside the pen core can be fully used up.

[0004] However, this structure of extruding ink by squeezing the pen body has the problem of poor controllability, which is mainly reflected in that it is not easy to control the ink output amount during squeezing, restricting the application in painting and writing. Therefore, it is necessary to improve the prior art. Summary of the Utility Model

[0005] The utility model provides an open - type air - pressurized pen core and a writing tool to solve the problem of uncontrollable ink output amount.

[0006] In the first aspect, the utility model provides the following technical solutions:

[0007] An open - type air - pressurized pen core includes a pen - core tube filled with ink inside. It further includes an elastic probe valve assembly, which is movably and telescopically arranged at the head of the pen - core tube and is used to open and close the head of the pen - core tube so that the ink flows out or is blocked; and an elastic air - compression assembly arranged at the tail of the pen - core tube. When the head of the pen - core tube is opened, the elastic air - compression assembly compresses itself to externally press the ink inside the pen - core tube. A capillary diversion hole is penetrated through the side wall of the pen - core tube and / or the elastic air - compression assembly. The aperture of the capillary diversion hole is smaller than the cross - sectional area of the inner cavity of the pen - core tube. When the pen - core tube is closed, the elastic air - compression assembly returns from the compressed state to the natural shape through the capillary diversion hole.

[0008] Preferably, a plurality of the capillary diversion holes are arranged on the side wall of the refill tube and / or at the elastic air compression assembly.

[0009] Preferably, the aperture of the capillary diversion holes is from 0.18 mm to 0.22 mm.

[0010] Preferably, the elastic probe valve assembly includes a needle valve, whose size is adapted to the opening at the end of the refill tube, and is slidably arranged in the refill tube; and a first elastic member, which is arranged in the refill tube and whose two ends are respectively connected to the refill tube and the needle valve. In the natural state, the needle valve is driven to block the opening at the end of the refill tube.

[0011] Preferably, the elastic air compression assembly is an airbag member, and the airbag member is fixedly sleeved on the tail of the refill tube.

[0012] Preferably, a lapping recess is provided at the outer periphery of the tail of the refill tube, and the airbag member is sleeved on the lapping recess.

[0013] Preferably, the elastic air compression assembly includes a piston member, which is slidably arranged at the tail end of the refill tube; and a second elastic member, whose two ends are respectively connected to the refill tube and the piston member. In the natural state, the second elastic member drives the piston member to block the opening at the tail end of the refill tube.

[0014] Preferably, the refill tube includes a tube body for storing ink, and the elastic air compression assembly is arranged at one end of the tube body; and a pen tip, which has an ink outlet channel communicating with the inner cavity of the tube body. The elastic probe valve assembly is movably arranged at the pen tip. The other end of the tube body has a first annular buckling portion, and one end of the pen tip has a second annular buckling portion that is hermetically buckled with the first annular buckling portion.

[0015] In a second aspect, the present invention provides the following technical solutions:

[0016] A writing instrument includes a refill, and further includes a pen holder. The pressurized refill is movably sleeved inside the pen holder. When the elastic probe valve assembly is pressed and the head of the refill tube is opened, the pen holder compresses the elastic air compression assembly.

[0017] Preferably, ventilation holes are provided through the pen holder.

[0018] Compared with the prior art, the utility model has at least one of the following beneficial effects: When the open - air pressurized pen core is in use, the user holds the pen and presses the pen tip on the paper surface. When the elastic probe valve probe at the head of the pen core tube touches the paper surface or the canvas, it retracts to open the valve and release the ink. At the same time, the elastic air compression component compresses and forms an extrusion pressure inside the pen core tube. At this time, since the aperture of the capillary diversion hole is smaller than the cross - sectional area of the inner cavity of the pen core tube, most of the pressure acts on the ink, causing the ink to flow out under increased pressure. When the pen is lifted, the elastic probe valve at the pen tip part rebounds under the action of the internal spring, closes the valve, and can immediately block the ink from flowing out. The action is rapid. Under this condition, air flows back into the pen core tube through the capillary diversion hole, resetting the elastic air compression component, enabling the next ink - squeezing action to have sufficient air pressure, and the ink - outputting force is uniform for multiple times, enabling fast and precise control of the ink - output volume size. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the open - air pressurized pen core provided in the first embodiment of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the open - air pressurized pen core provided in the first embodiment of the present utility model in the state of being pressed to output ink;

[0022] Figure 3 is a schematic structural diagram of the open - air pressurized pen core provided in the first embodiment of the present utility model in the state where the ink output is completed and air flows into the pen core;

[0023] Figure 4 is a schematic structural diagram of the open - air pressurized pen core provided in the second embodiment of the present utility model;

[0024] Figure 5 is a schematic structural diagram of the open - air pressurized pen core provided in the third embodiment of the present utility model in the state of being pressed to output ink;

[0025] Figure 6 is a schematic structural diagram of the open - air pressurized pen core provided in the third embodiment of the present utility model in the state where the ink output is completed and air flows into the pen core;

[0026] Figure 7It is a schematic structural diagram of an open - type air - pressurized pen refill provided in the fourth embodiment of the present utility model;

[0027] Figure 8 It is a schematic structural diagram of a writing instrument provided in the fifth embodiment of the present utility model.

[0028] Reference numerals:

[0029] 1. Pen refill tube; 11. Tube body; 111. First annular buckling part; 112. Lapping recess; 12. Pen tip; 121. Second annular buckling part; 2. Elastic probe valve assembly; 21. Needle valve; 22. First elastic member; 3. Elastic air compression assembly; 31. Airbag member; 32. Piston member; 33. Second elastic member; 4. Capillary diversion hole; 5. Pen holder; 51. Vent hole. Detailed implementation manners

[0030] To make the objectives, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component.

[0032] The following combines the attached Figure 1-8 And further illustrates the technical solutions of the present utility model through specific implementation manners

[0033] Embodiment 1:

[0034] Please refer to Figure 1, this embodiment provides an open - type air - pressurized pen refill. The structure of the pen refill mainly includes a pen refill tube 1, an elastic probe valve assembly 2, and an elastic air compression assembly 3. The pen refill tube 1 is mainly used for storing ink. It has a liquid - storage cavity that runs through both ends. For the convenience of description, one end is defined as the head, and the other end is defined as the tail. Among them, the elastic probe valve assembly 2 is arranged at the head of the pen refill tube 1 and is mainly used to open and close the head of the pen refill tube 1 so that the ink can flow out or be blocked. The elastic air compression assembly 3 is arranged at the tail of the pen refill tube 1. When the head of the pen refill tube 1 is opened, the elastic air compression assembly 3 is used to compress itself to apply pressure to the inside of the pen refill tube 1, so that the ink inside the pen refill tube 1 is under external pressure.

[0035] Specifically, to store the ink, the pen refill tube 1 mainly includes a tube body 11 and a pen tip 12. The tube body 11 can adopt a plastic tube body 11 structure. Because the plastic tube body 11 structure has a relatively smooth surface, while storing oily ink, it can also reduce the friction between the ink and the tube wall during the ink flow process, which is beneficial to the liquid discharge.

[0036] In addition, the pen tip 12 can adopt a metal pen tip 12 structure. The metal pen tip 12 also has a needle - tube structure, and an ink - outlet channel that runs through both ends is opened on the pen tip 12. The metal pen tip 12 has good hardness so that the writing action can be carried out stably. In other embodiments, other hard materials can also be used to replace the metal material, and no specific restrictions are made here.

[0037] When installing the pen tip 12, first, the elastic air compression assembly 3 is arranged at one end of the tube body 11, and the other end of the tube body 11 is used to install the pen tip 12. Among them, to improve the connection stability between the pen tip 12 and the tube body 11, first, a first annular buckling part 111 is arranged on the inner wall of the other end of the tube body 11. Preferably, the first annular buckling part 111 is in a stepped structure in this embodiment. At the same time, a second annular buckling part 121 is arranged at one end of the pen tip 12, and the shape of the second annular buckling part 121 matches that of the first annular buckling part 111, that is, the second annular buckling part 121 is also in a stepped structure in this embodiment.

[0038] Here, by pressing the end of the pen tip 12 with the second annular buckling part 121 into the end of the tube body 11 with the first annular buckling part 111, the first annular buckling part 111 and the second annular buckling part 121 are hermetically buckled, realizing the mutual installation between the pen tip 12 and the tube body 11. The structure has prominent sealing performance and is not easy to leak ink.

[0039] It should be noted that in other embodiments, the pen tip 12 and the tube body 11 can also be assembled by means of threaded connection or direct interference fit. Any method that can achieve the fixed connection between the two can be used, and the specific connection method is not limited here. Furthermore, based on the above settings, the ink outlet channel of the pen tip 12 communicates with the inner cavity of the tube body 11; further, the elastic probe valve assembly 2 is movably arranged at the pen tip 12 to block the ink outlet channel, so as to achieve the effect of controlling the opening and closing of the opening at the head of the refill.

[0040] Continue to refer to Figure 1 , specifically, the elastic probe valve assembly 2 is movably and telescopically arranged at the head of the refill tube 1. The elastic probe valve assembly 2 mainly includes a needle valve 21 and a first elastic member 22. The outer edge dimension of the needle valve 21 is adapted to the opening dimension at the end of the refill tube 1. The needle valve 21 is located inside the refill tube 1 and is slidably matched with the refill tube 1.

[0041] The first elastic member 22 adopts a spring structure in this embodiment. The first elastic member 22 is located inside the refill tube 1, and both ends of the first elastic member 22 are respectively connected to the pen tip 12 and the needle valve 21; in this embodiment, to facilitate the support of the first elastic member 22, the position of the pen tip 12 far from the needle valve 21 can be set to a reduced opening profile, and its inner wall can support one end of the first elastic member 22, so that the first elastic member 22 can apply an elastic thrust to the needle valve 21; at this time, when the first elastic member 22 is in a state without external force, that is, when the needle valve 21 is in a natural state, the needle valve 21 blocks the opening at the end of the refill tube 1 to prevent the ink from flowing out; on the contrary, when the refill is pressed against the paper, the needle valve 21 contacts the paper and retracts, and at the same time the first elastic member 22 is compressed, and the needle valve 21 opens the port of the refill tube 1 to facilitate the ink to flow out.

[0042] Continue to refer to Figure 1 , in the state where the port of the refill tube 1 is opened, the ink is pressurized by the elastic air compression assembly 3 to facilitate the ink to flow out; but before that, in order to balance the atmospheric pressure inside the refill tube 1, a capillary diversion hole 4 is penetrated through the side wall of the refill tube 1 in this embodiment. Among them, the capillary diversion hole 4 is located in the tail region of the refill tube 1, and the aperture size of the capillary diversion hole 4 should be smaller than the cross-sectional area of the inner cavity of the refill tube 1.

[0043] The purpose of the above setting is that during the compression of the elastic air compression assembly 3, according to the principle of air fluid mechanics, most of the air will be pressed towards the ink area, and a small part of the air will flow out from the capillary diversion hole 4 to achieve the purpose of pressurized ink output; immediately afterwards, after the ink output action is completed, the capillary diversion hole 4 can guide the air outside the refill back into the refill tube 1, so that the elastic air compression assembly 3 automatically resets from the compressed state to the natural shape, so as to facilitate the next pressurized ink output.

[0044] Furthermore, the aperture diameter of the capillary diversion hole 4 is from 0.18 mm to 0.22 mm, for example, it can be 0.18 mm, 0.2 mm or 0.22 mm, and preferably 0.2 mm. Tests have shown that when the capillary diversion hole 4 is less than 0.18 mm, it may affect the gas reflux and the recovery speed is too slow; if the aperture diameter of the capillary diversion hole 4 is greater than 0.22 mm, it may cause the air flow velocity to be too fast, and the pressure of the elastic air compression component 3 acting on the ink is insufficient, affecting the liquid output effect. By setting the aperture diameter of the capillary diversion hole 4 between 0.18 mm and 0.22 mm, the use effect is the best.

[0045] Moreover, the number of the capillary diversion holes 4 can also be multiple, such as two, three or four, etc. Here, by setting the number of the capillary diversion holes 4 to be multiple, it is beneficial to improve the uniformity of gas flow and the air intake volume. Compared with some structures with a larger cross-section of the pen core tube 1, the air flow exchange efficiency can be effectively improved.

[0046] Furthermore, continue to refer to Figure 1 , to apply pressure to the ink output. In this embodiment, the elastic air compression component 3 is selected as the airbag component 31. The airbag component 31 can be made of an elastic material such as rubber or silica gel, and the specific material is not limited here; moreover, the airbag component 31 has a sleeve-like structure, and one side thereof has a sleeve interface for installation. The airbag component 31 is sleeved and fixed to the tail of the pen core tube 1 via the sleeve interface. At this time, by pressing the airbag component 31, the ink can be pressured.

[0047] Meanwhile, to improve the installation firmness of the airbag component 31, the outer periphery of the tail of the pen core tube 1 has a necked-down structure. At this time, a lapping recess 112 is formed by concave in this area. The edge of the airbag component 31 is sleeved at the lapping recess 112. Here, the lapping recess 112 can provide a positioning function for the airbag component 31, so that the airbag component 31 is not easily installed too deep or too shallow, and the installation position is appropriate, and the use effect of the airbag component 31 is better.

[0048] The implementation principle of Embodiment 1 of this application is: combined with Figure 2 , the elastic probe valve component 2 can open the port of the pen core in the state where the pen core is pressurized. Subsequently, under the pressure of the elastic air compression component 3, the ink can flow out evenly and the ink output effect is good; then, combined with Figure 3 , after the ink output action is completed, the pen core leaves the painting carrier, and the elastic probe valve component 2 quickly closes the end of the pen core to achieve the effect of quickly controlling the ink outflow. At the same time, the capillary diversion hole 4 can supplement the outside air into the pen core tube 1, so that the airbag will rebound and provide a stable ink output pressure for the next ink output action.

[0049] Embodiment Two:

[0050] Refer toFigure 4 , based on Embodiment 1, for the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 lies in that the capillary diversion holes 4 are arranged on the airbag member 31. Through the above arrangement, the effect of gas circulation can also be achieved, and the airbag member 31 can also achieve the rebound effect.

[0051] In other embodiments, capillary diversion holes 4 can also be penetrated through the side wall of the pen core tube 1 and the airbag member 31 at the same time. This arrangement method can also make the airbag member 31 rebound. No matter how the arrangement position of the capillary diversion holes 4 is adjusted and combined, any method that can provide a rebound effect for the airbag member 31 can be tried and should be included in the interpretation of the protection scope.

[0052] The implementation principle of Embodiment 2 of this application is: by changing the arrangement position and combination method of the capillary diversion holes 4, the effect of gas circulation can also be achieved to realize the purpose of driving the airbag member 31 to rebound.

[0053] Embodiment Three:

[0054] , based on Embodiment 1, for the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 lies in the different structure of the elastic air compression assembly 3.

[0055] Referring to Figure 5 and Figure 6 , specifically, in this embodiment, the elastic air compression assembly 3 includes a piston member 32 and a second elastic member 33. Among them, the piston member 32 mainly includes a plug body and a plug rod fixedly connected to one end of the plug body. The plug body is hermetically filled into the tail end opening of the pen core tube 1, and the plug rod extends outward. At this time, by pressing the plug rod, the plug body can be driven to move into the pen core tube 1, thereby pressing the ink.

[0056] At the same time, the second elastic member 33 adopts a spring structure in this embodiment. The two ends of the second elastic member 33 are respectively fixedly connected to the pen core tube 1 and the piston member 32. The second elastic member 33 can provide a pressure for the plug body to move away from the ink at this time, so that the plug body can achieve a self-resetting action; in the natural state, the second elastic member 33 drives the piston member 32 to block the opening at the tail end of the pen core tube 1 to ensure that the piston member 32 has enough stroke to press the ink.

[0057] The implementation principle of Embodiment 3 of this application is: by setting the piston member 32 and the second elastic member 33, the technical effect of pressing the gas can also be achieved.

[0058] Embodiment Four:

[0059] Referring toFigure 7 , based on Embodiment 3, for the features not explained in this embodiment, the explanations in Embodiment 3 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 3 is that the capillary diversion holes 4 are arranged on the piston member 32. Through the above arrangement, the effect of gas circulation can also be achieved, and the piston member 32 can also achieve the reset effect.

[0060] In other embodiments, capillary diversion holes 4 can also be respectively penetrated and arranged on the side wall of the refill tube 1 and the piston member 32. This arrangement method can also reset the piston member 32. No matter how the setting positions of the fine diversion holes are adjusted and combined, the methods that can provide a reset effect for the piston member 32 can be tried and should be included in the interpretation of the protection scope.

[0061] The implementation principle of Embodiment 2 of this application is: by changing the setting position and combination method of the capillary diversion holes 4, the effect of gas circulation can also be achieved to realize the purpose of driving the piston member 32 to reset.

[0062] Embodiment Five:

[0063] Referring to Figure 8 , this embodiment provides a writing instrument applicable to the refill structures in Embodiments 1 to 4, and an airbag structure is used as an example in this embodiment; the writing instrument includes a refill, and further includes a pen holder 5. The structure of the pen holder 5 is in a shell shape, one end of the pen holder 5 is open, and its internal size is adapted to the refill; at this time, the refill can be movably sleeved inside the pen holder 5, and the refill and the pen holder 5 can be displaced alternately along the axis direction of the refill. When the elastic probe valve assembly 2 is pressed and the head of the refill tube 1 is opened, the inner wall of one end of the pen holder 5 can compress the elastic air compression assembly 3, so that the ink can simultaneously perform actions such as opening the port and pressing out the ink in one pressing action, and the process is convenient and fast.

[0064] Subsequently, when the ink output action is completed and the writing instrument is removed, under the action of the capillary diversion holes 4, the elastic air compression assembly 3 resets to facilitate the execution of the next ink output action.

[0065] Furthermore, for the convenience of air flow, a ventilation hole 51 can also be penetrated and arranged on one side of the pen holder 5. The ventilation hole 51 can allow air to flow inside and outside the pen holder 5, thereby facilitating the refill to perform the ink output action.

[0066] The implementation principle of the embodiment of this application is: by setting the pen holder 5, the function of quickly controlling the entry and exit of ink can be realized.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An open air pressurized pen core, comprising a pen core tube (1), the interior of the pen core tube (1) is filled with ink, characterized in that: It also includes an elastic probe valve assembly (2), which is movably and telescopically arranged at the head of the pen core tube (1) and is used to open and close the head of the pen core tube (1) to allow the ink to flow out or to block the ink; and an elastic air compression component (3) arranged at the tail end of the pen core tube (1); when the head end of the pen core tube (1) is opened, the elastic air compression component (3) compresses itself to press the ink inside the pen core tube (1) outward; a capillary guide hole (4) is provided through the side wall of the pen core tube (1) and / or the elastic air compression component (3); the aperture of the capillary guide hole (4) is smaller than the cross-sectional area of ​​the inner cavity of the pen core tube (1); when the pen core tube (1) is closed, the elastic air compression component (3) returns to a natural shape from a compressed state through the capillary guide hole (4).

2. The open air pressurized pen refill according to claim 1, characterized in that: There are multiple capillary guide holes (4) arranged on the side wall of the pen core tube (1) and / or the elastic air compression component (3).

3. The open air pressurized pen refill according to claim 1, characterized in that: The capillary flow guide hole (4) has a hole diameter of 0.18 mm to 0.22 mm.

4. The open air pressurized pen refill according to claim 1, characterized in that: The elastic probe valve assembly (2) comprises A needle valve (21) having a size adapted to the opening at the end of the pen core tube (1) and slidably disposed in the pen core tube (1); and a first elastic member (22) disposed in the pen core tube (1), with two ends respectively connected to the pen core tube (1) and the needle valve (21), and in a natural state, driving the needle valve (21) to block the end opening of the pen core tube (1).

5. The open air pressurized pen refill according to claim 1, characterized in that: The elastic air compression component (3) is an airbag component (31), and the airbag component (31) is fixedly sleeved on the tail of the pen core tube (1).

6. The open air pressurized pen refill according to claim 5, characterized in that: An overlapping recess (112) is provided at the outer periphery of the tail of the pen core tube (1), and the airbag component (31) is sleeved in the overlapping recess (112).

7. The open air pressurized pen refill according to claim 1, characterized in that: The elastic air compression component (3) comprises: A piston member (32) is slidably disposed at the rear end of the pen core tube (1); and a second elastic member (33), the two ends of which are respectively connected to the pen core tube (1) and the piston member (32); in a natural state, the second elastic member (33) drives the piston member (32) to block the opening at the rear end of the pen core tube (1).

8. The open air pressurized pen refill according to claim 1, characterized in that: The pen core tube (1) comprises: A tube body (11) is used to store ink, and the elastic air compression component (3) is arranged at one end of the tube body (11); and a pen tip (12) having an ink outlet passage communicating with the inner cavity of the tube body (11); the elastic probe valve assembly (2) is movably arranged at the pen tip (12); the other end of the tube body (11) has a first annular buckle portion (111); and one end of the pen tip (12) has a second annular buckle portion (121) sealingly buckled with the first annular buckle portion (111).

9. A writing instrument comprising the open air pressurized pen refill according to any one of claims 1 to 8, characterized in that: It also comprises a pen holder (5), wherein the pressurized pen core is movably sleeved inside the pen holder (5), and when the elastic probe valve assembly (2) is pressed and the head of the pen core tube (1) is opened, the pen holder (5) compresses the elastic air compression assembly (3).

10. The writing instrument according to claim 9, characterized in that: The pen holder (5) is provided with an air hole (51) extending therethrough.

Images