Ink outlet structure for preventing ink leakage, direct liquid valve pen and assembly method

Abstract

This invention provides an ink dispensing structure to prevent ink leakage, a direct-liquid valve pen, and an assembly method, belonging to the field of pen technology. It includes a pen barrel, a pen tip, and a first valve. The pen barrel has a pen cavity, the pen tip is located at one end of the pen cavity, and the other end of the pen cavity has a first threaded portion. The first valve is located inside the pen cavity and has a first channel. A push rod portion is formed within the first channel. A water-guiding core is disposed between the first channel and the pen tip. A water-blocking sleeve is disposed at the end of the first valve near the water-guiding core. The water-guiding core and at least a portion of the pen tip are enclosed within the water-blocking sleeve. The water-blocking sleeve has a third channel and a fourth channel. The inner diameter of the fourth channel is larger than that of the third channel. The first channel is inserted into the fourth channel to form a seal. In this invention, the water-guiding core can fully contact the first channel, which is beneficial for the rapid dispensing of ink, and the water-blocking sleeve can prevent ink leakage, improving the smoothness and stability of pen writing.

Description

Technical Field

[0001] The invention relates to the technical field of pens, and in particular to an ink outlet structure for preventing ink leakage, a direct liquid valve pen and an assembly method. Background Art

[0002] The direct liquid valve pen is an innovative writing tool. Its core design combines a direct liquid system with a valve control mechanism to ensure precise management of ink flow. Compared with traditional pens, the direct liquid valve pen has multiple advantages. First, it uses a direct liquid system to achieve a stable ink supply through capillary action and gravity, avoiding the phenomenon of ink interruption or uneven ink when writing. Secondly, the mechanical valve built into the direct liquid valve pen allows the user to control the flow of ink by pressing or rotating. This design not only prevents ink leakage when not in use, but also responds quickly to user needs when writing.

[0003] In the prior art, one end of the pen tip is inserted into the ink chamber to achieve ink discharge and writing. However, this not only causes unstable ink discharge, but also easily leads to ink leakage, and the overall cost of the pen is also increased. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide an ink outlet structure, a direct liquid valve pen and an assembly method for preventing ink leakage.

[0005] The technical solution adopted by the present invention is as follows: In the first aspect, the present application provides an ink outlet structure for preventing ink leakage, including a pen body assembly, the pen body assembly including a pen body, a pen tip and a first valve component, the pen body is provided with a pen cavity along its axial direction, the pen tip is provided at one end of the pen cavity, and a first threaded portion is provided at the other end of the pen cavity, the first valve component is provided in the pen cavity, a first channel is provided on the first valve component along its axial direction, a top rod portion is formed in the first channel, a water guide core is provided between the first channel and the pen tip, a water blocking sleeve is provided at one end of the first valve component close to the water guide core, the water guide core and at least part of the pen tip are wrapped in the water blocking sleeve, the water blocking sleeve is provided with a third channel along its axial direction, and a fourth channel is provided at one end of the third channel close to the first valve component, the inner diameter of the fourth channel is larger than the inner diameter of the third channel, the first channel is inserted into the fourth channel to form a seal, the water guide core is provided at one end of the third channel close to the fourth channel, and the pen tip is located at the other end.

[0006] In some embodiments, an extension sleeve portion is provided at one end of the first valve member close to the pen tip, a channel portion adapted to the extension sleeve portion is provided between the third channel and the fourth channel, the water guide core is coaxially provided in the extension sleeve portion, and the water guide core abuts between the pen tip and the top rod portion.

[0007] In the second aspect, the present application provides a direct liquid valve pen, including the ink outlet structure for preventing ink leakage, and also including an ink bag assembly, the ink bag assembly including an ink bag, a second valve component and a third valve component, the ink bag is provided with an ink cavity along its axial direction, ink is provided in the ink cavity, the outer wall of the ink bag is provided with a second threaded portion adapted to the first threaded portion, one end of the ink cavity is closed, and the other end is provided with an opening, the second valve component is provided at the opening, the second valve component is provided with a second channel along its axial direction, one end of the third valve component is inserted into the second channel to form a seal, when the pen body assembly and the ink bag assembly are connected through the first threaded portion and the second threaded portion, the push rod portion pushes the third valve component out of the second channel and makes the first channel communicate with the ink cavity.

[0008] In some embodiments, a truncated cone portion is provided at one end of the pen tip close to the water-introducing core, an end surface of the truncated cone portion is in contact with the water-introducing core, and a cavity is formed between the truncated cone portion and the third channel.

[0009] In some embodiments, the third valve component includes a sealing column portion and a conical portion adapted to the second channel, the conical portion is provided with a flow port, the sealing column portion is provided with a socket for inserting the push rod portion, and the water guide core abuts between the pen tip and the push rod portion.

[0010] In some embodiments, an extension tube is provided at one end of the water-guiding core close to the top rod, and the extension tube is sleeved outside the top rod. A first spring is provided between the top rod and the extension tube. Under the action of the first spring, the water-guiding core always maintains contact with the pen tip.

[0011] In some embodiments, a straight rod portion is provided at one end of the push rod portion close to the insertion hole, the diameter of the straight rod portion is larger than the diameter of the push rod portion, and the extension tube portion is sleeved outside the push rod portion and the end thereof abuts against the end of the straight rod portion.

[0012] In some embodiments, a through hole is provided on the third valve component, and the through hole connects the insertion hole and the ink chamber, a guide tube is slidably provided in the through hole, a flow channel portion is provided in the guide tube, a first flow channel opening is provided at one end of the flow channel portion close to the pushing rod portion, and an isolation portion is provided at one end close to the ink chamber, a second flow channel opening is provided on the guide tube close to the isolation portion, a protrusion is provided on the outer wall of the guide tube, a second spring is provided between the protrusion and the bottom wall of the insertion hole, and the second spring is sleeved on the guide tube, a fixing plate is provided in the insertion hole, and an active cavity is formed by the fixing plate and the insertion hole, the protrusion is located in the active cavity, a fifth channel is provided along the axial direction of the pushing rod portion, a sixth channel for inserting the guide tube is provided at one end of the fifth channel close to the first valve component, the inner diameter of the fifth channel is smaller than the inner diameter of the sixth channel, a limiting protrusion is provided in the ink chamber, and a third spring is provided between the limiting protrusion and the third valve component.

[0013] In some embodiments, a plurality of ink outlet holes are staggeredly distributed on the top rod portion, one end of the ink outlet hole is connected to the fifth channel, and the other end faces the extension cylinder portion.

[0014] In a third aspect, the present application provides an assembly method for the direct liquid valve pen, comprising the following steps:

[0015] Step S1: The water-introducing core is installed into the water-blocking sleeve, and one end of the water-blocking sleeve is inserted into the pen tip, and the other end is plugged into the first valve member;

[0016] Step S2: inserting the components assembled in step S1 into the pen cavity, and extending one end of the pen tip out of the pen cavity;

[0017] Step S3: inserting one end of the third valve component into the second channel of the second valve component;

[0018] Step S4: injecting ink into the ink chamber, and then installing the components assembled in step S3 at the opening end of the ink chamber;

[0019] Step S5: Connect the pen barrel assembly and the ink bag assembly through the first threaded portion and the second threaded portion, so that the push rod portion pushes the third valve component out of the second channel, thereby allowing the first channel to communicate with the ink chamber.

[0020] The beneficial effects of the present invention are as follows: the water-drawing core of the present invention can fully contact with the first channel, which is conducive to the rapid drawing out of ink, and the water-blocking sleeve can prevent ink leakage, thereby improving the fluency and stability of pen writing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0022] Figure 1 is a schematic diagram of the penholder assembly in the first embodiment;

[0023] Figure 2 is a schematic diagram of the ink bag assembly in Example 1;

[0024] Figure 3 Schematic diagram of the matching state of the pen body assembly and the ink bag assembly in Example 1 Figure 1 ;

[0025] Figure 4 Schematic diagram of the matching state of the pen body assembly and the ink bag assembly in Example 1 Figure 2 ;

[0026] Figure 5 It is a schematic diagram of the cooperation state between the pen body assembly and the ink bag assembly in the second embodiment;

[0027] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0028] Figure 7 for Figure 5 The enlarged view of point B in the middle;

[0029] Figure 8 It is a partial schematic diagram of the pen assembly in the third embodiment. DETAILED DESCRIPTION

[0030] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0031] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0033] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0034] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0036] Embodiment 1:

[0037] like Figures 1 to 4 As shown, in this embodiment, a straight liquid valve pen is provided, including a pen body assembly, an ink bag assembly and a pen cap 24, the pen body assembly includes a pen body 1, a pen head 2 and a first valve member 3, the pen body 1 is provided with a pen cavity 100 along its axial direction, the pen head 2 is provided at one end of the pen cavity 100, the other end of the pen cavity 100 is provided with a first threaded portion 101, the first valve member 3 is provided in the pen cavity 100, the first valve member 3 is provided on the first valve member 3 along its axial direction, a first channel 300 is formed in the first channel 300, that is, the first channel 300 is located between the first valve member 3 and A water guide core 4 is arranged between the top rod portion 301, the first channel 300 and the pen tip 2, and a water blocking sleeve 5 is arranged at one end of the first valve member 3 close to the water guide core 4, and the water guide core 4 and at least part of the pen tip 2 are wrapped in the water blocking sleeve 5; wherein, the water guide core 4 conducts ink from the storage area to the pen tip 2 through capillary action, ensuring that the ink can be smoothly output when writing, and the water guide core 4 can generally be made of materials with excellent ink-drawing effects such as polyethylene, polypropylene, nylon fiber, polyester fiber, etc., and secondly, the water blocking sleeve 5 can generally be made of materials that do not absorb ink such as silicone, synthetic rubber, thermoplastic elastomer, etc.

[0038] Secondly, the ink bag assembly includes an ink bag 6, a second valve component 7 and a third valve component 8. The ink bag 6 is provided with an ink cavity 600 along its axial direction. Ink is provided in the ink cavity 600. The outer wall of the ink bag 6 is provided with a second threaded portion 601 adapted to the first threaded portion 101. One end of the ink cavity 600 is closed and the other end is provided with an opening 602. The second valve component 7 is provided at the opening 602. The second valve component 7 is provided with a second channel 700 along its axial direction. One end of the third valve component 8 is plugged into the second channel 700 to form a seal. When the pen body assembly and the ink bag assembly are connected through the first threaded portion 101 and the second threaded portion 601, the push rod portion 301 pushes the third valve component 8 out of the second channel 700 and makes the first channel 300 communicate with the ink cavity 600.

[0039] In some embodiments, a rotation limiting portion 603 is provided on the ink bag 6 at one end of the second threaded portion 601 away from the opening 602. When the rotation limiting portion 603 abuts against the end of the pen shaft 1, the pen shaft assembly and the ink bag assembly are connected in place through the first threaded portion 101 and the second threaded portion 601, and the pen can write normally.

[0040] Among them, the water-blocking sleeve 5 is provided with a third channel 500 along its axial direction, and a fourth channel 501 is provided at one end of the third channel 500 close to the first valve member 3, the inner diameter of the fourth channel 501 is larger than the inner diameter of the third channel 500, the first channel 300 is inserted into the fourth channel 501 to form a seal, the water-drawing core 4 is provided at one end of the third channel 500 close to the fourth channel 501, and the pen tip 2 is located at the other end. With such a configuration, the water-drawing core 4 can fully contact with the first channel 300, which is beneficial to the rapid drawing out of ink, and the water-blocking sleeve 5 can avoid ink leakage.

[0041] The third valve member 8 comprises a sealing column portion 80 and a tapered portion 81 adapted to the second passage 700 . The tapered portion 81 is provided with a flow port 82 . The sealing column portion 80 is provided with a plug hole 83 for the push rod portion 301 to be inserted into.

[0042] Optionally, the water-drawing core 4 abuts between the pen tip 2 and the top rod portion 301 , so as to position the water-drawing core 4 .

[0043] Embodiment 2:

[0044] Based on the first embodiment, the pen will press the pen tip 2 each time it is used, so that the water guide core 4 is squeezed by the pen tip 2 and the top rod part 301. After multiple uses, a gap is easily generated between the pen tip 2 and the water guide core 4, resulting in a poor ink output effect or even ineffective ink output.

[0045] Based on the above problems, Figures 5 to 7 As shown, in this embodiment, the end of the water-introducing core 4 close to the top rod 301 is provided with an extension tube 400, and the extension tube 400 is sleeved outside the top rod 301. A first spring 9 is provided between the top rod 301 and the extension tube 400. Under the action of the first spring 9, the water-introducing core 4 always keeps in contact with the pen head 2 to ensure stable ink discharge. At the same time, if the water-introducing core 4 moves under elastic compensation, the extension tube 400 can ensure that the water-introducing core 4 can always absorb ink. Secondly, the extension tube 400 can also absorb ink, guide ink and store ink in advance, so that the ink can quickly pass through the water-introducing core 4 to the pen head 2, and when the ink in the ink chamber 600 is insufficient and the pen is not held for writing, the extension tube 400 can more fully contact with a small amount of ink to maintain normal writing function. In addition, when replacing the ink bag assembly, the extension tube 400 can also absorb the ink remaining in the first channel 300 as much as possible to reduce the amount of ink leakage when replacing the ink bag assembly.

[0046] In some embodiments, a straight rod portion 302 is provided at one end of the top rod portion 301 close to the socket 83, and the diameter of the straight rod portion 302 is larger than the diameter of the top rod portion 301. The extension cylinder portion 400 is sleeved on the outside of the top rod portion 301 and the end thereof abuts against the end of the straight rod portion 302. The water-guiding core 4 of sufficient length improves the efficiency and stability of ink output.

[0047] In some embodiments, a truncated cone portion 200 is provided at one end of the pen tip 2 close to the water-guiding core 4, and the end surface of the truncated cone portion 200 is in contact with the water-guiding core 4, and a cavity 201 is formed between the truncated cone portion 200 and the third channel 500. With such a configuration, the cavity 201 can store ink, and at the same time, the truncated cone portion 200 has a larger contact area with the ink than a plane, and when the truncated cone portion 200 presses against the water-guiding core 4, the ink can quickly fill the cavity 201, thereby improving the fluency and stability of the pen writing.

[0048] In some embodiments, the third valve member 8 is provided with a through hole 10, the through hole 10 connects the insertion hole 83 and the ink chamber 600, a guide tube 11 is slidably provided in the through hole 10, a flow channel portion 12 is provided in the guide tube 11, a first flow channel opening 13 is provided at one end of the flow channel portion 12 close to the top rod portion 301, and a separation portion 14 is provided at one end close to the ink chamber 600, a second flow channel opening 15 is provided on the guide tube 11 close to the separation portion 14, a protrusion 16 is provided on the outer wall, a second spring 17 is provided between the protrusion 16 and the bottom wall of the insertion hole 83, and the third valve member 8 is provided with a through hole 10, a guide tube 11 is provided with a through hole 10, and ... The second spring 17 is sleeved on the guide tube 11, and a fixing plate 18 is arranged in the insertion hole 83, and an active cavity 19 is formed in the fixing plate 18 and the insertion hole 83, and the protrusion 16 is located in the active cavity 19. The push rod portion 301 is provided with a fifth channel 20 along its axial direction, and an end of the fifth channel 20 close to the first valve member 3 is provided with a sixth channel 21 for inserting the guide tube 11, and the inner diameter of the fifth channel 20 is smaller than the inner diameter of the sixth channel 21. A limiting protrusion 22 is arranged in the ink cavity 600, and a third spring 23 is arranged between the limiting protrusion 22 and the third valve member 8.

[0049] Preferably, the inner diameter of the fifth channel 20 is equal to the inner diameter of the flow channel portion 12 .

[0050] With such arrangement, under normal conditions, the sealing column portion 80 of the third valve component 8 is inserted into the second channel 700 to form a seal, and at the same time, under the action of the second spring 17, the isolation portion 14 closes the through hole 10, that is, the second flow channel opening 15 cannot be connected with the ink chamber 600, and when the ink bag 6 is screwed into the pen chamber 100, one end of the guide tube 11 is inserted into the sixth channel 21 so that the fifth channel 20 is connected with the flow channel portion 12, and at the same time, the push rod portion 301 pushes the third valve component 8 out of the second channel 700, so that the second flow channel opening 15 extends out of the through hole 10, so that the fifth channel 20, the flow channel portion 12, and the second flow channel opening 15 are connected with the ink chamber 600, which can effectively increase the ink output of the water guide core 4, especially when there is less ink in the ink chamber 600, with the help of this path, the ink can be discharged more stably, thereby improving the fluency and stability of writing.

[0051] Furthermore, a plurality of ink outlet holes are staggeredly distributed on the top rod portion 301, one end of the ink outlet hole is connected to the fifth channel 20, and the other end faces the extension cylinder portion 400. Such an arrangement enables the extension cylinder portion 400 to absorb ink both inside and outside, thereby improving the efficiency of ink drawing.

[0052] In addition, under the action of the third spring 23, when the ink bag 6 is rotated out of the pen chamber 100, the third valve member 8 can be reinserted into the second channel 700 to form a seal, and the special ink adding device presses the guide tube 11 to make the flow channel portion 12 and the second flow channel opening 15 connected with the ink chamber 600, so that ink can be added, so that the ink bag assembly can be used multiple times, reducing the cost of using the pen.

[0053] Embodiment three:

[0054] Based on Example 1, Figure 8 As shown, in this embodiment, an extension sleeve portion 303 is provided at one end of the first valve member 3 facing the pen tip 2, a channel portion 502 adapted to the extension sleeve portion 303 is provided between the third channel 500 and the fourth channel 501, the water guide core 4 is coaxially arranged in the extension sleeve portion 303, and the water guide core abuts between the pen tip 2 and the top rod portion 301. Preferably, the inner diameter of the channel portion 502 is larger than the inner diameter of the third channel 500 and smaller than the inner diameter of the fourth channel 501, and the extension sleeve portion 303 is inserted into the channel portion 502 to form a seal. By providing the extension sleeve portion 303, the deformation of the water guide core 4 can be reduced, so that it maintains contact with the pen tip 2, thereby ensuring the smoothness of ink discharge. Secondly, it is conducive to the assembly of the water guide core 4 and further prevents ink leakage.

[0055] Embodiment 4:

[0056] Based on the first to third embodiments, this embodiment provides an assembly method of a direct liquid valve pen, comprising the following steps:

[0057] Step S1: If based on the first embodiment, the water-inducing core 4 is installed in the water-blocking sleeve 5, and one end of the water-blocking sleeve 5 is inserted into the pen tip 2, and the other end is plugged into the first valve member 3; if based on the second embodiment, the first spring 9 is installed in the extension cylinder 400, and then the extension cylinder 400 is inserted into the top rod 301, and then one end of the water-blocking sleeve 5 is connected to the pen tip 2, and the other end is connected to the first valve member 3; if based on the third embodiment, the water-inducing core 4 can be first installed in the extension sleeve 303, and then assembled with the water-blocking sleeve 5.

[0058] Step S2: Install the components assembled in step S1 into the pen cavity, and one end of the pen tip extends out of the pen cavity, wherein a snap-fit ​​structure is provided between the outer wall of the first valve member 3 and the inner wall of the pen cavity, which can refer to the plastic snap-fit ​​structure commonly used in the field of pen technology.

[0059] Step S3: insert one end of the third valve member 8 into the second channel 700 of the second valve member 7; wherein, if it is based on the second embodiment, first assemble the third valve member 8, the guide tube 11, the second spring 17 and the fixing plate into a third valve assembly.

[0060] Step S4: Ink is injected into the ink chamber 600, and then the components assembled in step S3 are installed at the open end of the ink chamber 600; wherein, a snap-fit ​​structure is also provided between the second valve member 7 and the ink chamber 600, which can refer to the plastic snap-fit ​​structure commonly used in the field of pen technology.

[0061] Step S5: Connect the pen barrel assembly and the ink bag assembly through the first threaded portion 101 and the second threaded portion 601, so that the push rod portion 301 pushes the third valve member 8 out of the second channel 700, thereby connecting the first channel 300 with the ink chamber 600.

[0062] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0063] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0064] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A straight liquid valve pen, characterized in that: The invention comprises a pen assembly and an ink bag assembly, wherein the pen assembly comprises a pen, a pen tip and a first valve member, wherein the pen assembly is provided with a pen cavity along its axial direction, the pen tip is provided at one end of the pen cavity, and a first threaded portion is provided at the other end of the pen cavity, the first valve member is provided in the pen cavity, a first channel is provided on the first valve member along its axial direction, a top rod portion is formed in the first channel, a water guide core is provided between the first channel and the pen tip, a water blocking sleeve is provided at one end of the first valve member close to the water guide core, the water guide core and at least part of the pen tip are wrapped in the water blocking sleeve, the water blocking sleeve is provided with a third channel along its axial direction, and a fourth channel is provided at one end of the third channel close to the first valve member, the inner diameter of the fourth channel is larger than the inner diameter of the third channel, the first channel is inserted into the fourth channel to form a seal, the water guide core is provided at one end of the third channel close to the fourth channel, and the pen tip is located at the other end; An extension sleeve is provided at one end of the first valve member close to the pen tip, a channel portion adapted to the extension sleeve is provided between the third channel and the fourth channel, the water guide core is coaxially provided in the extension sleeve, and the water guide core abuts between the pen tip and the top rod portion; The ink bag assembly comprises an ink bag, a second valve component and a third valve component. The ink bag is provided with an ink cavity along its axial direction. Ink is provided in the ink cavity. The outer wall of the ink bag is provided with a second threaded portion matched with the first threaded portion. One end of the ink cavity is closed and the other end is provided with an opening. The second valve component is provided at the opening. The second valve component is provided with a second channel along its axial direction. One end of the third valve component is plugged into the second channel to form a seal. When the pen barrel assembly and the ink bag assembly are connected through the first threaded portion and the second threaded portion, the push rod portion pushes the third valve component out of the second channel and makes the first channel communicate with the ink bag. The third valve member is provided with a through hole, which connects the insertion hole and the ink chamber, a guide tube is slidably arranged in the through hole, a flow channel portion is arranged in the guide tube, one end of the flow channel portion close to the pushing rod portion is provided with a first flow channel opening, and one end of the flow channel portion close to the ink chamber is provided with a separation portion, a second flow channel opening is arranged on the guide tube close to the separation portion, a protrusion is arranged on the outer wall of the guide tube, a second spring is arranged between the protrusion and the bottom wall of the insertion hole, and the second spring is sleeved on the guide tube, a fixing plate is arranged in the insertion hole, the fixing plate and the insertion hole form an active cavity, the protrusion is located in the active cavity, a fifth channel is arranged along the axial direction of the push rod portion, a sixth channel for inserting the guide tube is arranged at one end of the fifth channel close to the first valve member, the inner diameter of the fifth channel is smaller than the inner diameter of the sixth channel, a limiting protrusion is arranged in the ink chamber, and a third spring is arranged between the limiting protrusion and the third valve member.

2. The direct liquid valve pen according to claim 1, characterized in that: A truncated cone portion is arranged at one end of the pen tip close to the water-introducing core, an end surface of the truncated cone portion contacts the water-introducing core, and a cavity is formed between the truncated cone portion and the third channel.

3. The direct liquid valve pen according to claim 1, characterized in that: The third valve member comprises a sealing column portion and a tapered portion adapted to the second channel, the tapered portion is provided with a flow port, the sealing column portion is provided with a socket for inserting the push rod portion, and the water guide core abuts between the pen tip and the push rod portion.

4. The direct liquid valve pen according to claim 3, characterized in that: An extension tube is provided at one end of the water-guiding core close to the top rod, and the extension tube is sleeved outside the top rod. A first spring is provided between the top rod and the extension tube. Under the action of the first spring, the water-guiding core always keeps in contact with the pen tip.

5. The direct liquid valve pen according to claim 4, characterized in that: A straight rod portion is arranged at one end of the push rod portion close to the insertion hole, the diameter of the straight rod portion is larger than the diameter of the push rod portion, and the extension tube portion is sleeved outside the push rod portion and the end thereof abuts against the end of the straight rod portion.

6. The direct liquid valve pen according to claim 5, characterized in that: A plurality of ink outlet holes are staggeredly distributed on the top rod portion, one end of the ink outlet hole is connected to the fifth channel, and the other end faces the extension cylinder portion.

7. An assembly method for a straight liquid valve pen according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: The water-introducing core is installed into the water-blocking sleeve, and one end of the water-blocking sleeve is inserted into the pen tip, and the other end is plugged into the first valve member; Step S2: inserting the components assembled in step S1 into the pen cavity, and extending one end of the pen tip out of the pen cavity; Step S3: inserting one end of the third valve component into the second channel of the second valve component; Step S4: injecting ink into the ink chamber, and then installing the components assembled in step S3 at the opening end of the ink chamber; Step S5: Connect the pen barrel assembly and the ink bag assembly through the first threaded portion and the second threaded portion, so that the push rod portion pushes the third valve component out of the second channel, thereby allowing the first channel to communicate with the ink chamber.

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