Post-pressing valve type mark pen

Abstract

The utility model relates to a rear pressure valve type mark pen which comprises a pen point, a pen mouth, a pen holder and an ink storage cavity separating cylinder. An inner cavity of the penholder comprises a first ink storage cavity; an air hole is formed in one end, facing the pen mouth, of the pen holder or the ink storage cavity separation cylinder; the pen mouth is provided with an airflow channel; the airflow channel communicates with the outside and an inner cavity of the pen mouth, and the air hole communicates with the inner cavity of the pen mouth and the first ink storage cavity. The transparent rod body and the transparent cylinder body form an observation window for a user to observe the ink storage amount in the first ink storage cavity from the outside to the inside. According to the mark pen, the ink flowing stability can be effectively improved, on one hand, an air inlet channel is formed between the outside and the first ink storage cavity so that air pressure balance between the first ink storage cavity and the outside can be maintained, smooth writing experience is provided for a user, and on the other hand, the ink flowing stability can be effectively improved. A user can directly see the ink storage amount of the first ink storage cavity through the observation window, the pressing frequency and the pressing degree are flexibly controlled, and ink explosion and ink leakage are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of marker pens, in particular to a rear pressure valve type marker pen. Background Art

[0002] A marker, also known as a permanent marker or a marking pen, is a writing and drawing tool primarily used for marking and drawing. Specifically, markers can be categorized based on the valve position into two types: front-pressure valve markers and rear-pressure valve markers. Front-pressure valve markers operate by pressing the tip at the front of the pen, compressing the internal retractable structure and opening the ink outlet, ultimately releasing ink. Conversely, rear-pressure valve markers operate by pressing the retractable cap at the rear of the pen, pushing the push rod downward, compressing the internal retractable structure and opening the ink outlet, ultimately releasing ink.

[0003] Patent No. CN218777341U discloses a valve pen. Specifically, by pressing the drive cap, the drive cap drives the blocking member to move downward, thereby separating the lower part of the blocking member from the partition. At this time, the spring is in a compressed state and the through hole is open, and the ink in the first liquid storage chamber flows into the second liquid storage chamber through the through hole. On the one hand, combined with the aforementioned patent content and the accompanying drawings, it can be seen that the air return of this valve pen mainly relies on the pores of the pen tip itself. That is, when writing, ink flows from the second liquid storage chamber to the pen tip, and the outside air enters the second liquid storage chamber through the pores of the pen tip to maintain the air pressure balance between the inside and outside of the pen. However, the ventilation performance of the felt pen tip will be affected by environmental factors and the length of use. For example, the ventilation performance of the felt pen tip will decrease with the increase of the relative humidity of the environment, resulting in a decrease in internal pores, thereby reducing the ventilation performance. For example, as the use time increases, the pen tip may accumulate ink or dirt, thereby blocking the pores and reducing the ventilation performance. When the air pressure inside and outside the pen is unbalanced, the ink flow stability is affected, causing the ink flow to fluctuate, affecting writing quality. Furthermore, when the user presses the back-pressure valve to control ink flow, it is difficult to sense the flow of liquid within the second liquid reservoir. This can lead to excessive or frequent pressure, resulting in ink bursts and leaks. Therefore, the ink flow stability of valve pens still needs to be improved.

[0004] Therefore, there is still a need to improve the existing rear-pressure valve type marker pen to solve the problem of poor ink flow stability of the existing rear-pressure valve type marker pen. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a rear-pressure valve type marker pen to solve the problem of poor ink flow stability in existing rear-pressure valve type marker pens.

[0006] To achieve the above-mentioned object, the present invention provides a rear-pressure valve marker pen, comprising a pen tip, a pen nozzle, a pen body, and an ink storage chamber separation cylinder; the inner cavity of the pen body comprises a first ink storage chamber, and the first ink storage chamber is located on a side close to the pen nozzle;

[0007] The first ink storage chamber is surrounded by the pen barrel and the ink storage chamber partition cylinder;

[0008] The pen barrel or the ink storage chamber partition cylinder has an air hole at one end facing the pen tip; the pen tip has an air flow channel; the air flow channel connects the outside world with the inner cavity of the pen tip, and the air hole connects the inner cavity of the pen tip with the first ink storage chamber;

[0009] The pen barrel includes a transparent rod body, and the ink storage chamber partition cylinder includes a transparent cylinder body; the transparent rod body and the transparent cylinder body form an observation window for a user to observe the ink storage amount in the first ink storage chamber from the outside.

[0010] In some embodiments, the transparent rod body constitutes the grip section of the pen holder; the transparent cylinder body is in the shape of an elongated strip and extends along the axial direction of the ink storage chamber partition cylinder;

[0011] Or the portion of the ink storage chamber partition tube opposite to the gripping section of the pen shaft is the transparent cylinder; the transparent shaft is in the shape of an elongated strip and extends along the axial direction of the pen shaft.

[0012] In some embodiments, the transparent rod is in the shape of an elongated strip, and the width of the transparent rod gradually decreases from the front end to the rear end of the pen barrel.

[0013] In some embodiments, the transparent rod body is provided with multiple pieces, and is discretely arranged along the axial direction of the pen shaft.

[0014] In some embodiments, the transparent rod body gradually becomes smaller from the front end to the rear end of the pen shaft.

[0015] In some embodiments, the pen holder includes a first separating ring extending in a radial direction; the first separating ring covers the pen tip; the air hole is located on the first separating ring;

[0016] The ink storage chamber separation cylinder includes a first cylinder body and a second cylinder body that are separately arranged; the first separation ring covers the wider end of the first cylinder body, and the two surround the first ink storage chamber; the narrower end of the first cylinder body penetrates into the wider end of the second cylinder body;

[0017] The rear pressure valve type marker pen further includes a plug; the plug is movably arranged inside the first cylinder and the second cylinder, and is used to block the narrower end of the second cylinder.

[0018] In some embodiments, the air hole is located on the inner wall of the first separation ring.

[0019] In some embodiments, the air holes are located at an edge of the first separating ring.

[0020] In some embodiments, the separation ring includes a protrusion protruding toward the first cylinder; and the air hole is located on the protrusion.

[0021] In some embodiments, the ink storage chamber separation tube includes a third tube body; the narrower end of the third tube body faces the pen tip, and the third tube body covers the pen tip; the air hole is located on the third tube body;

[0022] The pen holder includes a second separating ring extending in a radial direction; the second separating ring covers the wider end of the third barrel; the first ink storage cavity is surrounded by the third barrel and the second separating ring;

[0023] The ink storage chamber separation cylinder further includes a fourth cylinder that is separate from the third cylinder, and the end of the second separation ring that is away from the third cylinder penetrates into the wider end of the fourth cylinder;

[0024] The rear pressure valve type marker pen further includes a plug; the plug is movably arranged inside the fourth cylinder and is used to block the narrower end of the fourth cylinder.

[0025] Compared with the prior art, the present invention has the beneficial effect of effectively improving the stability of ink flow, as follows.

[0026] On the one hand, the airflow channel, the inner cavity of the nib, and the air holes form a channel for air intake between the outside world and the first ink reservoir. After ink flows out of the first ink reservoir, the air pressure in the first ink reservoir will drop. The outside air can then enter the first ink reservoir through the airflow channel, the inner cavity of the nib, and the air holes, thereby maintaining the air pressure balance between the first ink reservoir and the outside world. This ensures that the ink can flow smoothly from the first ink reservoir, providing the user with a smooth writing experience. At the same time, compared to the pen tip, the air intake channel formed by the airflow channel, the inner cavity of the nib, and the air holes is basically unaffected by environmental factors and usage time, and can always maintain good performance.

[0027] On the other hand, when the user presses the rear valve marker pen to control the ink discharge, he can directly see the ink storage level of the first ink storage chamber through the observation window composed of the transparent rod and the transparent cylinder, and thus flexibly control the pressing frequency and degree according to the ink storage level, so as to fill the first ink storage chamber with ink as quickly and as much as possible, and effectively avoid ink explosion and ink leakage, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of a rear pressure valve type marker pen provided by the utility model;

[0029] Figure 2 This is a front view structural diagram of a rear pressure valve type marker pen provided by the utility model;

[0030] Figure 3 is with Figure 2 Schematic diagram of the corresponding internal structure;

[0031] Figure 4 This is a schematic diagram of various distributions of observation windows of a rear pressure valve type marker provided by the utility model;

[0032] Figure 5 This is another schematic diagram of the internal structure of a rear pressure valve type marker pen provided by the utility model;

[0033] Figure 6 This is another schematic diagram of the internal structure of a rear pressure valve type marker pen provided by the utility model;

[0034] Figures 7 to 9 This is a schematic diagram of the distribution of air holes in a rear pressure valve type marker pen provided by the present invention;

[0035] Figures 10 to 12 This is another type of distribution diagram of the air holes of a rear pressure valve type marker provided by the utility model;

[0036] Figure 13 This is a schematic diagram of the pairing of the annular ribs on the barrel and the annular ribs on the stem of a rear-pressure valve marker pen provided by the present invention;

[0037] Figure 14 This is a schematic diagram of various distributions of annular ribs on the barrel of a rear-pressure valve marker pen provided by the present invention;

[0038] Figure 15 This is a schematic diagram of the pairing of an annular rubber ring and an annular groove of a rear pressure valve type marker provided by the utility model;

[0039] Figure 16 This is a schematic diagram of the distribution of the air flow channel of a rear pressure valve type marker provided by the utility model;

[0040] Figure 17 This is another schematic diagram of the internal structure of a rear pressure valve type marker pen provided by the utility model. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] A marker is a writing and drawing tool primarily used for marking and drawing. More specifically, a rear-valve marker uses a retractable cap located at the rear end of the pen, which pushes the push rod downward, compressing the internal retractable structure and opening the ink channel, ultimately releasing ink.

[0043] Existing technologies rely solely on the pores of the pen tip for air intake. This degrades with environmental changes and prolonged use, leading to an imbalance in air pressure between the inside and outside of the pen, causing ink flow to fluctuate. Furthermore, when the user presses the back-pressure valve to control ink flow, it's difficult to sense the flow of liquid within the second liquid reservoir. This can lead to excessive or frequent pressure, resulting in ink bursts and leaks. Therefore, the ink flow stability of existing valve pens still needs to be improved.

[0044] The utility model provides a rear pressure valve type marker pen 1, such as Figures 1 to 3 As shown, it includes a pen tip 10, a pen nozzle 20, a pen body 30, and an ink storage chamber dividing tube 40; the inner cavity of the pen body 30 includes a first ink storage chamber 380, and the first ink storage chamber 380 is located on the side close to the pen nozzle 20; the first ink storage chamber 380 is surrounded by the pen body 30 and the ink storage chamber dividing tube 40; the pen body 30 or the ink storage chamber dividing tube 40 is provided with an air hole 381 at the end facing the pen nozzle 20; the pen nozzle 20 is provided with an air flow channel 280; the air flow channel 280 connects the outside and the inner cavity of the pen nozzle 20, and the air hole 381 connects the inner cavity of the pen nozzle 20 and the first ink storage chamber 380; the pen body 30 includes a transparent rod body 300, and the ink storage chamber dividing tube 40 includes a transparent cylinder body 400; the transparent rod body 300 and the transparent cylinder body 400 constitute an observation window for the user to observe the ink storage amount in the first ink storage chamber 380 from the outside to the inside.

[0045] Compared with the prior art, the back-pressure valve marker pen 1 provided by the present invention can effectively improve the stability of ink flow. Specifically:

[0046] On the one hand, the airflow channel 280, the inner cavity of the nib 20, and the air hole 381 form a channel for air intake between the outside world and the first ink storage chamber 380. After the ink flows out of the first ink storage chamber 380, the air pressure in the first ink storage chamber 380 will drop. The outside air can then pass through the airflow channel 280, the inner cavity of the nib 20, and the air hole 381, and finally enter the first ink storage chamber 380, thereby maintaining the air pressure balance between the first ink storage chamber 380 and the outside world, ensuring that the ink can flow smoothly from the first ink storage chamber 380, providing the user with a smooth writing experience. At the same time, compared with the pen tip 10, the air intake channel formed by the airflow channel 280, the inner cavity of the nib 20, and the air hole 381 is basically unaffected by environmental factors and usage time, and can always maintain good performance. In addition, the ink release of the front-pressure valve marker is controlled by pressing the pen tip, so the pen tip needs to withstand greater pressing force, and a hard pen tip is required to meet the user's usage requirements. For rear-pressure valve marker pens, ink flow is controlled through the rear end of the pen. The pressing force and frequency on the pen tip are greatly reduced. Therefore, there is no restriction on the pen tip material, and there are more diverse choices, which can provide users with a rich user experience.

[0047] On the other hand, when the user presses the rear-valve marker pen 1 to control the ink discharge, the user can directly see the ink storage level of the first ink storage chamber 380 through the observation window composed of the transparent rod body 300 and the transparent cylinder body 400, and thus flexibly control the pressing frequency and pressing degree according to the ink storage level, so as to make the first ink storage chamber 380 filled with ink as quickly and as much as possible, and effectively avoid ink explosion and ink leakage, thereby improving the user experience.

[0048] In addition, if Figure 3 As shown, the inner cavity of the pen body 30 also includes a second ink storage cavity 382. The ink storage cavity dividing tube 40 separates the first ink storage cavity 380 from the second ink storage cavity 382. The second ink storage cavity 382 serves as the main ink storage cavity, and the first ink storage cavity 380 serves as a buffer cavity. The capacity of the second ink storage cavity 382 is significantly larger than that of the first ink storage cavity 380. This arrangement is particularly suitable for acrylic marker ink that needs to be manually shaken before use to evenly mix the toner. After evenly mixing, the ink in the second ink storage cavity 382 is controlled to flow into the first ink storage cavity 380 for painting or writing.

[0049] It should be noted that in Figure 4 In order to better understand the position or shape of the observation window formed by the transparent rod body 300 and the transparent cylinder 400, a mesh pattern is used to mark the outer surface of the transparent rod body 300 and the transparent cylinder 400. The mesh pattern is only used to indicate the specific position or shape of the transparent rod body 300 and the transparent cylinder 400, and does not serve any other limiting role on the transparent rod body 300 and the transparent cylinder 400.

[0050] like Figure 4As shown in Figure a, in some embodiments, the transparent rod 300 constitutes the grip section of the pen barrel 30; the transparent cylinder 400 is in the shape of an elongated strip and extends along the axial direction of the ink storage chamber separation cylinder 40; the observation window formed by the transparent rod 300 and the transparent cylinder 400 is wide on the outside and narrow on the inside. During the process of ink flowing into the first ink storage chamber 380, since the transparent cylinder 400 is only a small part of the ink storage chamber separation cylinder 40, that is, the first ink storage chamber 380 is only partially visible, the effect actually seen by the user is that the ink flows along the elongated transparent cylinder. The area (i.e., the transparent barrel 400) rises, focusing attention more closely. Furthermore, compared to the transparent shaft 300, which is only a small portion of the grip section and the transparent barrel 400 is only a small portion of the ink reservoir separator 40, the transparent shaft 300 constitutes the entire grip section of the pen body 30. During installation, simply inserting the ink reservoir separator 40 into the front end of the pen body 30 ensures that the transparent barrel 400 and the transparent shaft 300 face each other, forming an observation window. There is no need to rotate the transparent barrel 400 to a specific angle, thus reducing assembly difficulty. Furthermore, the partial visibility of the first ink reservoir 380 also enhances the aesthetics of the marker, especially for acrylic marker ink, which tends to delaminate after standing still.

[0051] like Figure 4 As shown in b, in some embodiments, the ink storage chamber partition tube 40 and the portion opposite to the grip section of the pen body 30 are both transparent cylinders; the transparent rod body 300 is long and extends along the axial direction of the pen body 30. The observation window formed by the transparent rod body 300 and the transparent cylinder 400 is narrow on the outside and wide on the inside. The basic effect and installation principle are similar to Figure 4 Similar to a in the above, I will not repeat it here. Figure 4 As shown in middle c, in some embodiments, the transparent rod body 300 is in the shape of an elongated strip, and the width of the transparent rod body 300 gradually decreases from the front end to the rear end of the pen body 30. Through the change in width, the user can have a more intuitive feeling of the ink shortage of the first ink storage chamber 380. When the ink is flush with the wider part of the transparent rod body 300, it indicates to the user that the current ink shortage is relatively high and the amount of ink can be increased. When the ink is flush with the narrower part of the transparent rod body 300, it indicates to the user that the current amount of ink is relatively sufficient and the amount of ink can be reduced. This is more conducive to the user to accurately control the pressing frequency and pressing degree.

[0052] like Figure 4 As shown in FIG. d, in some embodiments, the transparent rod body 300 is provided with multiple pieces, and is discretely arranged along the axial direction of the pen body 30. Furthermore, in some embodiments, the transparent rod body 300 gradually becomes smaller from the front end to the rear end of the pen body 30. The basic effect and use principle are similar to those of FIG. Figure 4 It is similar to c in the above text and will not be repeated here.

[0053] like Figure 1 and Figure 3As shown, in some embodiments, the pen barrel 30 is integrally formed. Integral forming can reduce the number of parts assembly steps and help ensure consistent performance.

[0054] like Figure 5 As shown, the pen barrel 30 includes a first separator ring 301 extending radially. The first separator ring 301 encloses the pen tip 10. The air hole 381 is located on the first separator ring 301. The ink reservoir separator 40 includes a first barrel 401 and a second barrel 402, which are separately arranged. The first separator ring 301 covers the wider end of the first barrel 401, and the two barrels together form the first ink reservoir 380. The narrower end of the first barrel 401 penetrates the wider end of the second barrel 402. The rear-pressure valve marker 1 also includes a plug 501. The plug 501 is movably disposed within the first barrel 401 and the second barrel 402, and is used to seal the narrower end of the second barrel 402. The first barrel 401 and the second barrel 402 are separated, which facilitates installation of the plug 501 and reduces assembly difficulty. Furthermore, in some embodiments, the first barrel 401 is integrally formed. This integral molding can reduce the number of component assembly steps and help ensure consistent performance.

[0055] In some embodiments, the air hole 381 not only has the function of allowing air to enter the first ink storage chamber 380 , but also has the function of assisting in clamping the pen tip 10 .

[0056] Based on the air hole 381 being located on the inner wall of the first separation ring 301:

[0057] Furthermore, in some embodiments, Figures 7 to 9 As shown, the end of the pen tip 10 that penetrates the first separation ring 301 is a conical head, and there is only one air hole 381. Furthermore, in some embodiments, such as Figures 7 and 8 As shown, the first separating ring 301 includes a connecting ring 302 located in the middle; the two ends of the connecting ring 302 protrude toward the pen tip 20 and the ink storage chamber separating tube 40 respectively, which not only improves the strength of the plastic parts, but also prevents the ink toner from settling and blocking the air hole 381 when the pen is placed at an angle or upright, so as to ensure that the air hole 381 can normally take in air; the pen tip 10 penetrates the connecting ring 302; the air hole 381 is located on the inner cavity wall of the connecting ring 302.

[0058] Furthermore, in some embodiments, Figures 10 to 12 As shown, the end of the pen tip 10 that penetrates the first separator ring 301 is a cylindrical head; there are at least four air holes 381, evenly distributed around the central axis of the first separator ring 301; the inner cavity of the first separator ring 301 and all the air holes 381 cooperate to form a regular polygonal cavity. Furthermore, in some embodiments, the inner cavity of the first separator ring 301 and all the air holes 381 cooperate to form a regular hexagonal cavity or a regular octagonal cavity.

[0059] In some embodiments, as Figure 3 As shown, the air hole 381 is located at the edge of the first separator ring 301, while the pen tip 10 is inserted into the middle of the first separator ring 301. This eliminates the need to consider the pen tip 10 when designing the air hole 381, reducing the design difficulty of the air hole 381. Furthermore, in some embodiments, the first separator ring 301 includes a protrusion 303 that projects toward the ink reservoir separation tube 40. The air hole 381 is located on the protrusion 303. When the ink has large pigment particles, particularly acrylic marker ink, the protrusion 303 effectively prevents the ink from settling and blocking the air hole 381 when the user holds the pen at an angle or vertically, thereby ensuring that the air hole 381 can properly receive air.

[0060] In some embodiments, as Figure 3 As shown, the airflow channel 280 is located at the front end of the nib 20, between the inner wall of the nib 20 and the nib 10. This arrangement allows the airflow channel 280 to be substantially opposite the air hole 381, resulting in more direct airflow and less resistance. Furthermore, in some embodiments, the nib 20 includes radially extending ribs 201. There are at least three ribs 201, evenly distributed circumferentially around the central axis of the nib 20. Along the radial direction of the nib 20, all ribs 201 cooperate to clamp the nib 10. Along the circumference of the nib 20, two adjacent ribs 201 cooperate to form a single airflow channel 280. The ribs 201 not only function to clamp the nib 10 but also to form the airflow channel 280, providing enhanced practicality. Multiple airflow channels 280 ensure a larger total air intake volume and help provide a more uniform flow field, reducing flow field unevenness. Furthermore, in some embodiments, there are four or six ribs 201.

[0061] In some embodiments, as Figure 16 As shown, the air flow channel 280 is located in the middle of the pen tip 20, that is, the air flow channel 280 is located on the side close to the first separating ring 301, and penetrates the pen tip 20 in the radial direction, thereby connecting the outside world with the inner cavity of the pen tip 20. When multiple symmetrically distributed air flow channels 280 are provided, it is beneficial to reduce weight and improve aesthetics.

[0062] In some embodiments, as Figure 5 As shown, the pen body 30 includes a main body tube 304; a first separating ring 301 is formed at the front end of the main body tube 304. The integral molding can reduce the number of parts assembly steps and help ensure that the performance tends to be consistent. The pen body 30 also includes a connecting tube 305; the connecting tube 305 is formed on the first separating ring 301 and protrudes toward the pen tip 20 to facilitate the assembly of the pen tip 20. The connecting tube 305 is inserted into the pen tip 20 and has an interference fit therewith. Furthermore, in some embodiments, such as Figure 6As shown, the pen holder 30 further includes a tail cylinder 306 and an end cover 307 . One end of the tail cylinder 306 is inserted into the main tube 304 and has an interference fit therewith, and the other end of the tail cylinder 306 is inserted into the end cover 307 and has an interference fit therewith. In addition, the rear-pressure valve marker pen 1 also includes a rear-pressure valve assembly 50. In addition to the plug 501, the rear-pressure valve assembly 50 also includes a spring (not shown in the figure), a connecting tube 502, a silicone sheet 503, and a pressing cap 504. The plug 501 is movably inserted into the ink storage chamber separation tube 40, and the two ends of the spring respectively press against the step of the ink storage chamber separation tube 40 and the skirt of the plug 501. After the user releases the pressing cap 504, the spring provides a reset force for the plug 501. One end of the connecting tube 502 is for the plug 501 to penetrate and fix, and the other end of the connecting tube 502 presses against the silicone sheet 503. The outer edge / outer circumference of the silicone sheet 503 is fixed to the inside of the tail tube 306. The pressing cap 504 is movably inserted into the end cover 307 and can be pressed by the user to control the outflow of ink.

[0063] like Figure 13 As shown, in some embodiments, the outer circumferential surface of the first cylinder 401 is formed with a cylinder annular rib 403, and the inner circumferential surface of the main body tube 304 is formed with a rod annular rib 308 that matches the cylinder annular rib 403. After the first cylinder 401 is inserted into the main body tube 304, the cylinder annular rib 403 and the rod annular rib 308 are offset to achieve an interference fit between the first cylinder 401 and the main body tube 304, which is easy to install and has a simple structure.

[0064] like Figure 14 As shown, in some embodiments, an annular rib 403 is provided at least one of the end of the first barrel 401 facing the tip 20, the middle of the first barrel 401, and the end of the first barrel 401 facing away from the tip 20. Preferably, the annular rib 403 is provided only at the end of the first barrel 401 facing away from the tip 20. This not only achieves an interference fit with the main tube 304, but also prevents ink from seeping from the end of the first barrel 401 facing away from the tip 20 into the space between the outer wall of the first barrel 401 and the inner wall of the main tube 304, thereby interfering with the user's viewing experience. Preferably, the annular rib 403 is provided at both ends of the first barrel 401. This not only achieves an interference fit with the main tube 304, but also prevents ink from seeping from both ends into the space between the outer wall of the first barrel 401 and the inner wall of the main tube 304, thereby further enhancing the anti-interference effect.

[0065] In some embodiments, as Figure 15 As shown, an annular rubber ring 60 is fixedly provided on the outer circumference surface of the first cylinder 401, and an annular groove 383 adapted to the annular rubber ring 60 is provided on the inner circumference surface of the main tube 304. With the cooperation of the annular rubber ring 60 and the annular groove 383, the first cylinder 401 and the main tube 304 can be firmly assembled and ink can be prevented from seeping in.

[0066] In some embodiments, as Figure 17 As shown, the ink storage chamber separation cylinder 40 includes a third cylinder 404; the narrower end of the third cylinder 404 faces the pen tip 20, and the third cylinder 404 covers the pen tip 10; the air hole 381 is located on the third cylinder 404; the pen body 30 includes a second separation ring 311 extending in the radial direction; the second separation ring 311 covers the wider end of the third cylinder 404; the first ink storage chamber 380 is surrounded by the third cylinder 404 and the second separation ring 311; the ink storage chamber separation cylinder 40 also includes a fourth cylinder 405 that is separately arranged from the third cylinder 404, and the end of the second separation ring 311 facing away from the third cylinder 404 penetrates into the wider end of the fourth cylinder 405; the rear pressure valve type marker pen 1 also includes a plug 501; the plug 501 is movably arranged inside the fourth cylinder 405 and is used to seal the narrower end of the fourth cylinder 405. Because the third barrel 404 is separated by the second separation ring 311 and does not directly contact the second ink storage chamber 382, ​​ink can be effectively prevented from seeping between the outer wall of the third barrel 404 and the inner wall of the main tube 304. Furthermore, in some embodiments, the third barrel 404 is integrally formed, which can reduce the number of parts assembly steps and help ensure consistent performance.

[0067] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rear-pressure valve marker pen, comprising a nib, a nozzle, a barrel, and an ink reservoir separator; the barrel's inner cavity includes a first ink reservoir, the first ink reservoir being located near the nozzle; and characterized in that: The first ink storage chamber is surrounded by the pen barrel and the ink storage chamber partition cylinder; The pen barrel or the ink storage chamber partition cylinder has an air hole at one end facing the pen tip; the pen tip has an air flow channel; the air flow channel connects the outside world with the inner cavity of the pen tip, and the air hole connects the inner cavity of the pen tip with the first ink storage chamber; The pen barrel includes a transparent rod body, and the ink storage chamber partition cylinder includes a transparent cylinder body; the transparent rod body and the transparent cylinder body form an observation window for a user to observe the ink storage amount in the first ink storage chamber from the outside.

2. The rear-pressure valve marker pen according to claim 1, characterized in that: The transparent rod body constitutes the grip section of the pen holder; the transparent cylinder body is in the shape of an elongated strip and extends along the axial direction of the ink storage chamber partition cylinder; Or the portion of the ink storage chamber partition tube opposite to the gripping section of the pen shaft is the transparent cylinder; the transparent shaft is in the shape of an elongated strip and extends along the axial direction of the pen shaft.

3. The rear-pressure valve marker pen according to claim 2, characterized in that: The transparent rod body is in the shape of an elongated strip, and the width of the transparent rod body gradually decreases from the front end to the rear end of the pen body.

4. The rear-pressure valve marker pen according to claim 1, characterized in that: The transparent rod body is provided with multiple pieces, and is discretely arranged along the axial direction of the pen shaft.

5. The rear-pressure valve marker pen according to claim 4, characterized in that: The transparent rod body gradually becomes smaller from the front end to the rear end of the pen shaft.

6. A rear-pressure valve marker pen according to any one of claims 1 to 5, characterized in that: The pen holder includes a first separating ring extending in a radial direction; the first separating ring covers the pen tip; the air hole is located on the first separating ring; The ink storage chamber separation cylinder includes a first cylinder body and a second cylinder body that are separately arranged; the first separation ring covers the wider end of the first cylinder body, and the two surround the first ink storage chamber; the narrower end of the first cylinder body penetrates into the wider end of the second cylinder body; The rear pressure valve type marker pen further includes a plug; the plug is movably arranged inside the first cylinder and the second cylinder, and is used to block the narrower end of the second cylinder.

7. The rear-pressure valve marker pen according to claim 6, characterized in that: The air hole is located on the inner cavity wall of the first separation ring.

8. The rear-pressure valve marker pen according to claim 6, characterized in that: The air hole is located at the edge of the first separation ring.

9. The rear-pressure valve marker pen according to claim 8, characterized in that: The separation ring includes a protrusion protruding toward the first cylinder; the air hole is located on the protrusion.

10. The rear-pressure valve marker pen according to any one of claims 1 to 5, characterized in that: The ink storage chamber separation cylinder includes a third cylinder; the narrower end of the third cylinder faces the pen tip, and the third cylinder covers the pen tip; the air hole is located on the third cylinder; The pen holder includes a second separating ring extending in a radial direction; the second separating ring covers the wider end of the third barrel; the first ink storage cavity is surrounded by the third barrel and the second separating ring; The ink storage chamber separation cylinder further includes a fourth cylinder that is separate from the third cylinder, and the end of the second separation ring that is away from the third cylinder penetrates into the wider end of the fourth cylinder; The rear pressure valve type marker pen further includes a plug; the plug is movably arranged inside the fourth cylinder and is used to block the narrower end of the fourth cylinder.

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