Direct liquid type marking pen

Abstract

The utility model discloses a direct liquid type marking pen which comprises a pen holder and a pen core, the pen holder comprises an inner cavity, a valve is arranged in the inner cavity, the inner cavity of the pen holder is divided into a front cavity and a rear cavity by taking the valve as a boundary, the pen core is made of fiber materials, and the front end of the pen core extends forwards from the front end of the pen holder and is used for writing. The rear end of the refill is movably arranged in the front cavity in a penetrating mode and matched with the valve in a linkage mode, the refill comprises a rod-shaped ink absorption section arranged in the front cavity, an ink storage sleeve is arranged in the front cavity and installed on the ink absorption section of the refill in a sleeving mode, and the ink storage sleeve is made of hard materials. The ink storage sleeve comprises an outer peripheral face arranged in the direction corresponding to the inner wall of the pen holder and an inner peripheral face arranged in the direction corresponding to the ink absorption section of the pen refill, the ink storage sleeve comprises a plurality of narrow slits, and each narrow slit is provided with an outer opening and an inner opening in the outer peripheral face and the inner peripheral face of the ink storage sleeve respectively. According to the direct liquid type marking pen, the ink storage sleeve is made of the hard material, so that production and assembly of the marking pen are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of marker pens, in particular to a direct liquid marker pen. Background Art

[0002] A marker pen is a pen that can be used to write marks or logos on a variety of materials. Direct liquid marker pens are widely used due to their large ink filling volume, smooth writing and stable line traces.

[0003] The structure of the common direct liquid marker on the market usually includes a pen body and a refill. The pen body includes an inner cavity, and a valve is usually provided in the inner cavity. The inner cavity of the pen body can be divided into a front cavity and a rear cavity by the valve. Among them, the rear cavity is responsible for long-term storage of ink. In order to maintain the fluidity of the ink in the rear cavity, a steel ball is usually provided in the rear cavity. The front cavity is responsible for short-term storage of ink. The refill is made of plastic fiber material and can be used to absorb and conduct ink. The rear end of the refill is movably arranged in the front cavity and linked to the valve. When the ink in the front cavity is exhausted, the refill can be driven to move backward by applying a certain pressure to link the valve to open, so that the ink in the rear cavity can flow into the front cavity to replenish the ink in the front cavity. In the natural state, the valve is driven by a spring to remain in a closed state to prevent the ink in the rear cavity from entering the front cavity and prevent the ink from volatilizing. At the same time, in order to prevent the ink in the front chamber from evaporating too quickly, a sponge ink storage sleeve is usually provided in the front chamber. The sponge ink storage sleeve has a large number of micropores, which can absorb and store a certain amount of ink to ensure the continuous supply of ink during writing and avoid the phenomenon of ink interruption. It can also control the amount of ink output to prevent the pen core from leaking too much ink during writing. The specific structure of the existing marker pen can refer to the record of a Chinese utility model patent, a valve-type cartridge-changing marker pen (CN2908173Y).

[0004] In the prior art, when assembling the ink storage sleeve of a marker pen, the ink storage sleeve needs to be put on the pen core first, and then inserted into the front cavity of the pen body together with the pen core. Since the ink storage sleeve is made of sponge material and is relatively soft, it is very easy to touch the pen body and deform and move when it is installed and moves back and forth with the pen core, which makes assembly inconvenient.

[0005] In addition, the spring used to drive the valve to close automatically in the existing direct liquid marker is usually designed to have a large elastic force, and the movement stroke of the pen core is also designed to be long. When the pen core is subjected to writing pressure in daily writing, it will not drive the pen core to move backward. The valve will only be driven to open when the user actively presses the pen core. The existing opening method of the valve of this marker pen causes the user to easily experience a sudden interruption of ink after writing for a long time. Every time the ink is insufficient, the user needs to independently perform the ink replenishment operation, which is more troublesome to use. In order to improve the opening effect of the valve, the front end of the pen core is usually harder and not easy to deform when being pressed. For example, the front end of the pen core is usually manufactured to have a larger outer diameter and a circular front end structure, which greatly limits the writing effect of the marker, resulting in a relatively stiff and thick written line that cannot change with the change of writing force. Summary of the invention

[0006] In view of the deficiencies in the prior art, the utility model provides a direct liquid marker pen, the ink storage sleeve of which is made of a hard material, which is more conducive to the production and assembly of the marker pen.

[0007] The utility model discloses a direct liquid marker pen, comprising a pen holder and a pen core. The pen holder comprises an inner cavity, a valve is arranged in the inner cavity, and the inner cavity of the pen holder is divided into a front cavity and a rear cavity by the valve as a boundary. The pen core is made of fiber material, the front end of the pen core extends forward from the front end of the pen holder and is used for writing, the rear end of the pen core is movably arranged in the front cavity and cooperates with the valve, and the valve can be driven to open by the backward movement of the pen core, so that the ink in the rear cavity can flow into the front cavity. The pen core comprises a rod-shaped ink absorbing section arranged in the front cavity, an ink storage sleeve is arranged in the front cavity, and the ink storage sleeve is mounted on the ink absorbing section of the pen core, and the ink storage sleeve is made of hard material, for example, plastic or nylon. Material, the ink storage sleeve includes an outer circumferential surface arranged in the direction of the inner wall of the pen barrel and an inner circumferential surface arranged in the direction of the ink absorption section of the pen core. The ink storage sleeve includes a plurality of narrow slits, and each narrow slit is respectively provided with an outer opening and an inner opening on the outer circumferential surface and the inner circumferential surface of the ink storage sleeve. The ink flowing into the front cavity can enter the narrow slit through the outer opening of the ink storage sleeve, and be transported to the ink absorption section of the pen core through the inner opening. Utilizing the capillary principle, the narrow slit has a certain adsorption and storage effect on the ink, which can slow down the volatilization speed of the ink in the front cavity, so that the ink in the front cavity of the marker pen can be retained for a longer time when not in use, and the marker pen is not prone to ink shortage when writing.

[0008] Furthermore, the plurality of narrow slits are arranged at intervals along the axial direction of the ink storage sleeve, so as to reasonably utilize the axial space of the ink storage sleeve and increase the storage capacity of ink.

[0009] Furthermore, the ink storage sleeve includes a plurality of annular plates arranged at intervals along the axial direction. The narrow slit is formed by the interval between two axially adjacent annular plates. The outer opening is formed between the outer edges of two axially adjacent annular plates, and the inner opening is formed between the inner edges of two axially adjacent annular plates. In practical applications, a gap for the ink to pass through should be reserved between the outer peripheral surface of the ink storage sleeve and the inner peripheral wall of the front cavity.

[0010] Furthermore, two axially adjacent annular plates are connected by at least two support ribs, and these support ribs are circumferentially arranged evenly along the axis of the ink storage sleeve. The setting of the support ribs helps to maintain the stability of the overall structural form of the ink storage sleeve, making it not easy to deform during assembly, and also helps to ensure that there is a uniform gap size between two adjacent annular plates.

[0011] Furthermore, these support ribs in each narrow slit extend along the radial direction of the ink storage sleeve and divide the narrow slit into at least two fan-shaped small narrow slits arranged circumferentially, making the ink distribution more uniform.

[0012] Furthermore, the ink storage sleeve includes a front end corresponding to the pen tip direction and a rear end corresponding to the pen tail direction. A first guiding inclined surface capable of guiding and inserting the rear end of the pen core into it is provided at the front end of the inner hole of the ink storage sleeve. A narrow hole that cooperates with and clamps the pen core and a second guiding inclined surface capable of guiding and inserting the rear end of the pen core into the narrow hole are also provided in the inner hole of the ink storage sleeve. When the rear end of the pen core is inserted into the inner hole of the ink storage sleeve, the second guiding inclined surface can guide it into the narrow hole. The ink storage sleeve made of hard material can improve the fixing effect with the pen core and is not easy to generate relative displacement. In addition, when the hard ink storage sleeve moves back and forth with the pen core, it is not easy to deform due to contact with the inner wall of the pen barrel.

[0013] Further, the valve includes a valve body, a valve seat, a valve core, and a spring. The valve body is embedded and fixed in the pen barrel. The valve body has an inner hole for ink to pass through. The valve seat is inserted and fixed at the front end of the inner hole of the valve body. The valve core is movably arranged in the inner hole of the valve body. The rear end of the refill and the valve seat form a movable fit. The rear end of the refill passes through the valve seat and is fixedly connected to the valve core. The valve core can be pushed backward by the refill. The force of the refill comes from the pressure during writing. A valve port for sealing cooperation with the front end of the valve core is provided at the rear end of the valve seat. The spring is sleeved on the valve core and forms abutting cooperation with the valve core and the valve body respectively. The rear end of the inner hole of the valve body is connected to the rear cavity. When the valve core is in sealing cooperation with the valve seat, it corresponds to the end point position of the valve core moving forward. A limiting structure for limiting the end point position of the valve core moving backward is provided between the valve body and the valve core. The forward and backward movement stroke of the valve core is 0.8 - 1.2 mm. The minimum force exerted by the spring on the valve core is 25 - 40 g. When the marker pen is in a natural state, that is, when the refill is not subjected to a backward driving force, the spring drives the front end of the valve core and the valve port of the valve seat to be in sealing cooperation, preventing the ink in the rear cavity from entering the front cavity. During writing, the writing pressure drives the refill to move backward, and then drives the valve core to move backward, opening the valve port. The ink in the rear cavity can flow into the front cavity through the inner hole of the valve body.

[0014] In the valve structure of marker pens on the existing market, the minimum elastic force value of the spring is at least above 150 g, and most are even above 300 g. The movement stroke of the valve core is above 3 mm. During the normal writing process, the valve cannot be opened automatically. The user needs to actively apply a backward force to the refill to drive the valve to open. However, for the marker pen of the present invention, only a force of 25 - 40 g needs to be provided to the refill to drive the valve to open, and it can be opened automatically during the writing process. Moreover, due to the appropriate forward and backward movement stroke of the valve core, it will not affect the normal writing experience. In addition, the requirements for the hardness and shape of the front end of the refill can be reduced. The front end of the refill of the marker pen of the present invention can be designed to be softer and sharper, so that the writing strokes can change accordingly with the change of the writing force, improving the writing effect.

[0015] Further, a conical mating surface for mating and sealing is provided at the front end / valve port of the valve core. The conical mating surface at the front end / valve port of the valve core is used for mating and sealing, making the structure of the valve simpler and facilitating the production and assembly of the marker pen.

[0016] Further, the rear end of the valve core includes a guide rod. A plurality of guide ribs are circumferentially and evenly arranged at the rear end of the inner hole of the valve body. Ink channels for ink to pass through are formed at intervals between adjacent guide ribs in the circumferential direction. The ends of the plurality of guide ribs and the outer circumference of the guide rod form a sliding and guiding fit. Through the cooperation of the guide ribs and the guide rod, the movement effect of the valve core can be improved, making it not easy to generate deviation between its front end and the valve port, ensuring a good sealing effect, and the arrangement of the ink channels does not affect the normal flow of ink. The rear end of the guide rod is conical for convenient installation. A stepped surface for limiting cooperation with the front ends of the plurality of guide ribs is provided at the front end of the guide rod, which is used to limit the end position of the valve core moving backward, avoiding long-distance backward movement of the pen core during writing, and can improve the writing effect.

[0017] Further, the width of the part for writing at the front end of the pen core is gradually reduced from the rear to the front. This part is of a conical or wedge-shaped structure, making the front end of the pen core softer, enabling the thickness of the writing line to change with the change of writing force, and improving the writing effect of the marker pen.

[0018] The beneficial effects of the present utility model are as follows: The ink storage sleeve of the present utility model is made of a hard material, with a simple structure and low production cost. Compared with the existing ink storage sleeve made of sponge material, it is not easy to deform and shift during assembly, which is more conducive to production and assembly, and it can slow down the evaporation rate of the ink in the front chamber, thereby improving the writing effect of the marker pen. Description of the Drawings

[0019] Figure 1 is an exploded view of an embodiment of the present utility model;

[0020] Figure 2 is a structural diagram of the ink storage sleeve of an embodiment of the present utility model;

[0021] Figure 3 is a side view of the ink storage sleeve of an embodiment of the present utility model;

[0022] Figure 4 is a radial cross-sectional view of the ink storage sleeve of an embodiment of the present utility model;

[0023] Figure 5 is an axial cross-sectional view of the ink storage sleeve of an embodiment of the present utility model;

[0024] Figure 6 is a partial cross-sectional view of an embodiment of the present utility model;

[0025] Figure 7 is a structural diagram of the valve body of an embodiment of the present utility model;

[0026] Figure 8 is a structural diagram of the valve core of an embodiment of the present utility model;

[0027] Figure 9 This is a pen core structure of another embodiment of the utility model. DETAILED DESCRIPTION

[0028] The embodiment of the direct liquid marker pen of the utility model is as follows Figures 1-8 As shown, it includes a pen body 1 and a refill 2. The pen body 1 includes an inner cavity 10. A valve is arranged in the inner cavity 10. The inner cavity 10 of the pen body 2 is divided into a front cavity 101 and a rear cavity 102 by the valve. The rear cavity 102 is used for long-term storage of ink. A steel ball capable of preventing ink from condensing is arranged in the rear cavity 102. The refill 2 is made of fiber material. The front end of the refill 2 extends forward from the front end of the pen body 1 and is used for writing. The rear end of the refill 2 is movably arranged in the front cavity 101 and cooperates with the valve. The backward movement of the refill 2 can drive the valve to open, so that the ink in the rear cavity 102 can flow into the front cavity 101. The refill 2 includes a rod-shaped ink absorbing section 21 placed in the front cavity 101. An ink storage sleeve 3 is arranged in the front cavity 101. The ink storage sleeve 3 is mounted on the ink absorbing section 21 of the refill 2. The ink storage sleeve 3 is made of a hard The ink storage sleeve 3 is made of a material such as plastic or nylon. The ink storage sleeve 3 includes an outer circumferential surface arranged in the direction of the inner wall of the pen barrel 1 and an inner circumferential surface arranged in the direction of the ink absorption section of the pen core. The ink storage sleeve 3 includes a plurality of narrow slits 30. Each narrow slit 30 is respectively provided with an outer opening 301 and an inner opening 302 on the outer circumferential surface and the inner circumferential surface of the ink storage sleeve 3. The ink flowing into the front cavity 101 can enter the narrow slit 30 through the outer opening 301 of the ink storage sleeve 3, and be transported to the ink absorption section 21 of the pen core 2 through the inner opening 302. By utilizing the capillary principle, the narrow slit 30 has a certain adsorption and storage effect on the ink, which can slow down the volatilization speed of the ink in the front cavity 101, so that the ink in the front cavity 101 of the marker pen can be retained for a longer time when not in use, and the ink is not easy to be cut off when the marker pen is used for writing.

[0029] like Figures 2 to 4 As shown, the plurality of narrow slits 30 are spaced apart and distributed along the axial direction of the ink storage sleeve 3, so as to reasonably utilize the axial space of the ink storage sleeve 3 and increase the storage capacity of ink.

[0030] The ink storage sleeve 3 includes a plurality of annular plates 31 spaced apart in the axial direction, and the narrow slit 30 is formed by the interval between two axially adjacent annular plates 31. The outer opening 301 is formed between the outer edges of the two axially adjacent annular plates 31, and the inner opening 302 is formed between the inner edges of the two axially adjacent annular plates 31. In actual application, an annular gap for ink to pass through should be reserved between the outer peripheral surface of the ink storage sleeve 3 and the inner peripheral wall of the front cavity 101. In this embodiment, the thickness of the two annular plates 31 at the farthest end in the axial direction is thicker than that of the other annular plates. Under the premise of ensuring the structural strength, the number of narrow slits 30 is increased as much as possible.

[0031] Two axially adjacent annular plates 31 are connected by at least two support ribs 32. In this embodiment, as Figure 4 shown, the number of support ribs 32 is 4. These support ribs 32 are circumferentially and uniformly arranged along the axis of the ink storage sleeve 3. The arrangement of the support ribs 32 helps to maintain the stability of the overall structural form of the ink storage sleeve 3, making it not easy to deform during assembly, and also helps to ensure that there is a uniform gap size between two adjacent annular plates 31.

[0032] These support ribs 32 in each narrow slit 30 extend along the radial direction of the ink storage sleeve 3 and divide the narrow slit 30 into four small narrow slits 300 that are circumferentially and uniformly arranged, making the ink distribution more uniform.

[0033] In this embodiment, one end of the support rib 32 corresponding to the axis extends to the inner edge of the annular plate 31, so that each small narrow slit 300 of each narrow slit 30 has an inner opening 302 respectively. One end of the support rib 32 far from the axis extends to a position close to the inner edge of the annular plate 31, so that the four small narrow slits 300 share an outer opening 301.

[0034] The ink storage sleeve 3 includes a front end corresponding to the pen tip direction and a rear end corresponding to the pen tail direction. A first guiding inclined surface 311 capable of guiding and inserting the rear end of the pen core 2 into it is provided at the front end of the inner hole of the ink storage sleeve 3. A narrow hole 312 that cooperates with and clamps the pen core 2 and a second guiding inclined surface 313 capable of guiding and inserting the rear end of the pen core 2 into the narrow hole 312 are also provided in the inner hole of the ink storage sleeve 3. When the rear end of the pen core 2 is inserted into the inner hole of the ink storage sleeve 3, the second guiding inclined surface 313 can guide it into the narrow hole 312. The aperture of the narrow hole 312 is set to be slightly smaller than the diameter of the ink absorption section 21 of the pen core 2. When the ink absorption section 21 of the pen core 2 is inserted into the narrow hole 312, it can form a clamping and positioning for it.

[0035] The valve includes a valve body 41, a valve seat 42, a valve core 43, and a spring 44. The valve body 41 is embedded and fixed in the pen barrel 1. The valve body 41 has an inner hole for ink to pass through. The valve seat 42 is inserted and fixed at the front end of the inner hole of the valve body 41. The valve core 43 is movably arranged in the inner hole of the valve body 41. The rear end of the refill 2 and the valve seat 42 form a movable fit. The rear end of the refill 2 passes through the valve seat 42 and is fixedly connected to the valve core 43. The valve core 43 can be pushed backward by the refill 2. The force of the refill 2 comes from the pressure during writing. A valve port 421 is provided at the rear end of the valve seat 42. The front end of the valve core 43 is provided with a conical mating surface 431 that cooperates with and seals the valve port 421 of the valve seat 42. This conical mating surface 431 can also be provided on the valve port 421. The setting of the conical mating surface 431 can improve the contact sealing effect and reduce the requirement for the tolerance fit accuracy. Compared with the sealing structure using a sealing ring, the structure of the valve is simpler, and it is also convenient for the production and assembly of the marker pen. The spring 44 is sleeved on the valve core 43 and abuts between the valve core 43 and the valve body 41. The elastic force of the spring 44 acts on the valve core 43 to drive the valve core 43 to move forward. And when the valve core 43 cooperates with and seals the valve port 421 of the valve seat, it corresponds to the end position of the valve core 43 moving forward. The rear end of the inner hole of the valve body 41 is connected to the rear chamber 102. A limiting structure is provided between the valve body 41 and the valve core 43 to limit the end position of the valve core 43 moving backward. The forward and backward movement stroke of the valve core 43 is 0.8 - 1.2 mm. The minimum force of the spring 44 acting on the valve core 43 is 25 - 40 g. When the marker pen is in a natural state, that is, when the refill 2 is not subjected to a backward driving force, the spring 44 drives the front end of the valve core 43 to seal and cooperate with the valve port 421 of the valve seat to prevent the ink in the rear chamber from entering the front chamber. During writing, the writing pressure drives the refill 2 to move backward, and then drives the valve core 43 to move backward, opening the valve port 421, and the ink in the rear chamber can flow into the front chamber through the inner hole of the valve body 41.

[0036] Respectively as Figure 7 , 8 shown, the rear end of the valve core 43 includes a guide rod 432. A plurality of guide ribs 411 are circumferentially and evenly arranged at the rear end of the inner hole of the valve body 41. An ink passage 412 for ink to pass through is formed between adjacent circumferential guide ribs 411. The radially inward ends of the plurality of guide ribs 411 and the outer periphery of the guide rod 432 form a sliding and guiding fit. Through the cooperation of the guide ribs 411 and the guide rod 432, the moving effect of the valve core 43 can be improved, so that it is not easy to generate an offset between its front end and the valve port 421, ensuring a good sealing effect. The setting of the ink passage does not affect the normal flow of ink. In addition, the rear end of the guide rod 432 is conical, which can conveniently guide and insert the guide rod 432 into the central position of the plurality of guide ribs 411.

[0037] A stepped surface 433 that forms a limit fit with the front ends of the plurality of guiding ribs 411 is provided at the front end of the guiding rod 432, which is used to limit the end position of the valve core 43 moving backward, avoid long-distance backward movement of the refill 2 during writing, and improve the writing effect. The rear ends of the plurality of guiding ribs 411 also form a limit fit with the steel balls in the rear cavity 102, preventing the steel balls from entering the inner hole of the valve body 41 and also preventing the steel balls from blocking the ink channel.

[0038] In this embodiment, the front end of the refill adopts a common round head structure, which has relatively high hardness, is not easily deformed during writing, the written lines are relatively thick, and will not change significantly according to the change of writing pressure.

[0039] In other embodiments, as Figure 9 shown, the width of the part of the front end of the refill for writing is gradually reduced from back to front, and this part is a conical structure, making the front end of the refill softer, enabling the thickness of the writing line to change with the change of writing force, and improving the writing effect of the marker pen. A wedge-shaped structure can also be adopted in other embodiments.

[0040] The above embodiments are only one of the preferred specific embodiments of the present invention, and the common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A direct liquid marker pen, comprising a pen holder and a refill, wherein the pen holder comprises an inner cavity, a valve is arranged in the inner cavity, and the inner cavity of the pen holder is divided into a front cavity and a rear cavity by the valve as a boundary, the refill is made of fiber material, the front end of the refill extends forward from the front end of the pen holder and is used for writing, the rear end of the refill is movably arranged in the front cavity and cooperates with the valve, the refill comprises a rod-shaped ink absorbing section arranged in the front cavity, an ink storage sleeve is arranged in the front cavity, and the ink storage sleeve is mounted on the ink absorbing section of the refill, characterized in that: The ink storage sleeve is made of hard material, and includes an outer circumferential surface arranged in the direction corresponding to the inner wall of the pen barrel and an inner circumferential surface arranged in the direction corresponding to the ink absorption section of the pen core. The ink storage sleeve includes a plurality of narrow slits, and each narrow slit is respectively provided with an outer opening and an inner opening on the outer circumferential surface and the inner circumferential surface of the ink storage sleeve.

2. The direct liquid marker pen according to claim 1, characterized in that: The plurality of narrow slits are distributed along the axial direction of the ink storage sleeve at intervals; the ink storage sleeve includes a plurality of annular plates distributed along the axial direction at intervals, the narrow slit is formed by the interval between two axially adjacent annular plates, the outer opening is formed between the outer edges of the two axially adjacent annular plates, and the inner opening is formed between the inner edges of the two axially adjacent annular plates.

3. The direct liquid marker pen according to claim 2, characterized in that: Two axially adjacent annular plates are connected via at least two supporting ribs, and the supporting ribs are evenly distributed along the circumference of the axis of the ink storage sleeve.

4. The direct liquid marker pen according to claim 3, characterized in that: The supporting ribs in each narrow slit are arranged to extend radially along the ink storage sleeve and divide the narrow slit into at least two fan-shaped small narrow slits evenly distributed along the circumferential direction.

5. The direct liquid marker pen according to claim 1, characterized in that: The ink storage sleeve includes a front end arranged in the direction corresponding to the pen tip and a rear end arranged in the direction corresponding to the pen tail. The front end of the inner hole of the ink storage sleeve is provided with a first guide inclined surface capable of guiding the rear end of the pen core to be inserted therein. The inner hole of the ink storage sleeve is also provided with a narrow hole that cooperates with the pen core and is clamped, and a second guide inclined surface capable of guiding the rear end of the pen core to be inserted into the narrow hole.

6. The direct liquid marker pen according to claim 1, characterized in that: The valve comprises a valve body, a valve seat, a valve core and a spring. The valve body is embedded and fixed in the pen body. The valve body has an inner hole for ink to pass through. The valve seat is plugged and fixed at the front end of the inner hole of the valve body. The valve core is movably arranged in the inner hole of the valve body. The rear end of the pen core and the valve seat form a movable fit. The rear end of the pen core passes through the valve seat and is fixedly connected to the valve core. The rear end of the valve seat is provided with a valve port that is sealed with the front end of the valve core. The spring is sleeved on the valve core and respectively forms an abutment fit with the valve core and the valve body. The rear end of the inner hole of the valve body is connected to the rear cavity. When the valve core is sealed with the valve seat, it corresponds to the end point position of the valve core moving forward. A limiting structure for limiting the end point position of the valve core moving backward is provided between the valve body and the valve core. The forward and backward movement stroke of the valve core is 0.8-1.2mm, and the minimum force of the spring acting on the valve core is 25-40g.

7. The direct liquid marker pen according to claim 6, characterized in that: The front end / valve port of the valve core is provided with a conical matching surface for matching sealing.

8. The direct liquid marker pen according to claim 6, characterized in that: The rear end of the valve core includes a guide rod, and the rear end of the inner hole of the valve body is evenly distributed with a plurality of guide ribs, and ink channels for ink to pass through are formed between adjacent circumferential guide ribs. The ends of the plurality of guide ribs slide and guide with the outer periphery of the guide rod, and the front end of the guide rod is provided with a stepped surface that forms a limiting fit with the front ends of the plurality of guide ribs.

9. The direct liquid marker pen according to claim 8, characterized in that: The rear end of the guide rod is tapered.

10. The direct liquid marker pen according to claim 6, characterized in that: The width of the writing portion at the front end of the pen core is gradually reduced from the back to the front, and the portion is a cone or wedge-shaped structure.

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