Refill and pen

Abstract

The application discloses a refill and a pen. The refill comprises a main body, a first ball, a second ball and an elastic member. The main body is internally provided with a containing hole and a fluid channel. The containing hole is arranged at the end of the main body, and the fluid channel is used for containing fluid. The fluid channel and the containing hole are connected and communicated. The first ball is arranged in the containing hole and partially exposed outside the main body. The second ball is arranged in the containing hole, and the second ball is close to the fluid channel relative to the first ball. The second ball is in abutment with the first ball, and the first ball is used for driving the second ball to rotate. The elastic member is arranged in the fluid channel, one end of the elastic member abuts against one end of the second ball away from the first ball, and the elastic member is used for applying an acting force to the second ball and directing to the direction of the first ball. Through the arrangement, the friction in writing can be reduced, the smoothness of writing is improved, and the service life of the refill is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of office supplies, in particular to a refill and a pen. BACKGROUND

[0002] The tip of the writing pen on the market usually adopts the form of a single-bead spring tip. Since the size of the writing pen is small, it is difficult to ensure the stable and accurate positioning between the single bead and the spring during the assembly process.

[0003] In addition, one end of the spring of the commonly used single-bead spring tip usually adopts a thimble mode, which presses the ball bead through the thimble end, so as to seal the ink when the writing pen is not used. However, in order to ensure the high-quality writing experience and certain leakage prevention performance, the machining precision and structural strength of the thimble are required to be high. SUMMARY

[0004] The present application provides a refill and a pen to solve some or all of the deficiencies in the related prior art.

[0005] The first aspect of the present application provides a refill, which comprises a main body, a first ball bead, a second ball bead and an elastic member. The main body is internally provided with an accommodation hole and a fluid channel. The accommodation hole is arranged at the end of the main body, and the fluid channel is used to accommodate fluid. The fluid channel and the accommodation hole are connected and communicated. The first ball bead is arranged in the accommodation hole and partially exposed outside the main body. The second ball bead is arranged in the accommodation hole, and the second ball bead is close to the fluid channel relative to the first ball bead. The second ball bead abuts against the first ball bead, and the first ball bead is used to drive the second ball bead to rotate. The elastic member is arranged in the fluid channel, one end of the elastic member abuts against one end of the second ball bead away from the first ball bead, and the elastic member is used to apply a force to the second ball bead, which is directed to the direction of the first ball bead. By such arrangement, the friction in writing can be reduced, the smoothness of writing can be improved, and the service life of the refill can be increased.

[0006] Further, the diameter of the second ball bead is greater than the diameter of the first ball bead, so that the second ball bead can seal the accommodation hole, and the ball centers of the first ball bead and the second ball bead are located on the central axis of the refill, which improves the sealing performance of the fluid and the writing experience.

[0007] Further, the second ball has a surface roughness greater than the surface roughness of the first ball; and / or the surface roughness of the first ball is greater than or equal to 0.012 μm and less than or equal to 0.25 μm; and / or the surface roughness of the second ball is greater than or equal to 0.25 μm. The greater surface roughness of the second ball can attach more fluid from the fluid channel, increasing the fluid outflow of the refill; and the smaller surface roughness of the first ball can reduce the friction with the writing surface, improving the smoothness of the refill.

[0008] Further, the main body includes a pen head portion and a pen body portion, the accommodating hole is arranged in the pen head portion, and the cross-sectional area of the pen head portion perpendicular to the central axis of the refill is less than the cross-sectional area of the pen body portion perpendicular to the central axis of the refill. The thinner pen head portion provides better elasticity for the refill, thereby providing a better writing experience for the user.

[0009] Further, the fluid channel in the pen head portion is a first flow channel, and the fluid channel in the pen body portion is a second flow channel; the flow area of the first flow channel perpendicular to the central axis of the refill is less than the flow area of the second flow channel perpendicular to the central axis of the refill; and / or the wall thickness of the pen head portion is greater than or equal to 0.15 mm and less than or equal to 0.8 mm. In this way, when the cross-sectional area of the pen head portion is less than that of the pen body portion, the pen head portion has sufficient wall thickness to ensure the structural strength of the refill, and compared with the technical solution in which the flow areas of the first flow channel and the second flow channel are equal, the storage amount of fluid in the fluid channel can be increased, and the service life of the refill can be prolonged.

[0010] Further, the elastic member and the single-side gap of the fluid channel are a first gap, and the first gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, which can limit the moving direction of the spring, ensure the sealing effect of the fluid and the writing effect of the refill.

[0011] Further, the accommodating hole comprises a first accommodating portion, a connecting portion and a second accommodating portion, the first accommodating portion is away from the elastic piece relative to the second accommodating portion; the first accommodating portion is used for accommodating the first ball, the second accommodating portion is used for accommodating the second ball, one end of the connecting portion is connected with the first accommodating portion, and the other end of the connecting portion is connected with the second accommodating portion; the refill can be switched between a writing state and a non-use state, when the refill is in the writing state, the connecting portion is in communication with the first accommodating portion and the second accommodating portion; when the refill is in the non-use state, the connecting portion is in communication with the first accommodating portion, so that the flow effect of the fluid and the sealing effect are better when the refill is switched between the writing state and the non-use state, and the first accommodating portion and the connecting portion can limit the movement of the first ball along the central axis of the refill, thereby improving the writing experience.

[0012] Further, when the refill is in the non-use state, the maximum cross section of the second ball is flush with the end face of the second accommodating portion away from the connecting portion; when the refill is switched from the non-use state to the writing state, the second ball moves in the direction from the first ball to the elastic piece; taking the gap between the surface of the second ball and the wall surface of the second accommodating portion when the refill is in the non-use state as a second gap, and taking the gap between the surface of the second ball and the wall surface of the second accommodating portion when the refill is in the writing state as a third gap, the third gap is greater than the second gap, so as to guarantee the sealing effect when the refill is in the non-use state and the smoothness of the fluid flow when the refill is in the writing state.

[0013] Further, when the refill is in the non-use state or the writing state, the single-side gap between the first ball and the first accommodating portion is greater than or equal to 0.002 mm and less than or equal to 0.02 mm; and / or, when the refill is in the non-use state, the single-side gap between the second ball and the second accommodating portion is greater than or equal to 0.002 mm and less than or equal to 0.02 mm; and / or, when the refill is in the writing state, the single-side gap between the second ball and the second accommodating portion is greater than or equal to 0.005 mm and less than or equal to 0.05 mm, so as to guarantee the sealing effect when the refill is in the non-use state and the smoothness of the fluid flow when the refill is in the writing state.

[0014] Further, the first accommodating portion and the connecting portion are connected through a first taper surface; and / or, the second accommodating portion and the connecting portion are connected through a second taper surface, which is beneficial to the flow of the fluid in the first accommodating portion and the second accommodating portion, and improves the utilization rate of the fluid.

[0015] Further, the connecting portion comprises a central hole unit and a flow guide unit, the flow guide unit is arranged at the circumferential side of the central hole unit and extends outward along the circumferential side of the central hole unit, one end of the central hole unit is communicated with the first accommodating portion, the other end of the central hole unit is communicated with the second accommodating portion, one end of the flow guide unit is communicated with the first taper surface, the other end of the flow guide unit is communicated with the second taper surface, so that the fluid can have more sufficient flow space at the connecting portion during the rotation of the first ball and the second ball, thereby ensuring the smoothness of writing.

[0016] The second aspect of the present application provides a pen, comprising a pen shell and the refill according to any one of the preceding embodiments, wherein the refill is located inside the pen shell.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of one embodiment of the refill of the present application.

[0020] Figure 2 Fig. 2 shows a schematic diagram of the cross-sectional view of the A area in Fig. 1. Figure 1

[0021] Figure 3 Fig. 3 shows a schematic diagram of the longitudinal cross-sectional view of the refill shown in Fig. 1. Figure 1 Fig. 4 shows a schematic diagram of the longitudinal cross-sectional view of the main body part of the refill shown in Fig. 1.

[0022] Figure 4 Fig. 5 shows a schematic diagram of the cross-sectional view of the B-B in Fig. 1. Figure 1 Fig. 6 shows a schematic diagram of the longitudinal cross-sectional view of the main body part of the refill shown in Fig. 1.

[0023] Figure 5 Fig. 7 shows a schematic diagram of the longitudinal cross-sectional view of another embodiment of the refill of the present application. Figure 4 Fig. 8 shows a schematic diagram of the cross-sectional view of the B-B in Fig. 7.

[0024] Figure 6 Fig. 9 shows a schematic diagram of the longitudinal cross-sectional view of another embodiment of the refill of the present application.

[0025] Figure 7 Fig. 10 shows a schematic diagram of the longitudinal cross-sectional view of the main body part of the refill shown in Fig. 9. Figure 6 Fig. 11 shows a schematic diagram of the longitudinal cross-sectional view of the main body part of the refill shown in Fig. 9.

[0026] ​Figure 8 Fig. 1 shows a schematic view of one embodiment of the pen of the present application. DETAILED DESCRIPTION

[0027] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to all alternative embodiments, as would be understood by persons skilled in the art. The following exemplary embodiments are described herein with reference to the figures. Like numbers refer to like elements throughout. The features of the described embodiments can be combined in any combination while remaining within the scope of the present application. The following exemplary embodiments are described herein for illustrating the present application and not for limiting the same. The following exemplary embodiments are described herein for purposes of illustration only.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, technical terms or scientific terms used herein are intended to have the meanings commonly understood by one of ordinary skill in the art. The articles "a", "an", and "the" as used herein are intended to mean zero or one or more, unless otherwise indicated. The terms "comprising", "including", "containing", and "having" as used herein are intended to be open-ended terms that mean one or more of the stated elements are present. The terms "connected" and "coupled" as used herein are intended to be open-ended terms describing one or more relationships between the connected or coupled entities. The term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "plurality" as used herein refers to two or more.

[0029] Reference Figures 1 to 7 In accordance with a first aspect of the present application, there is provided a refill 100. The refill 100 comprises a main body 1, the main body 1 having a receiving hole 11 and a fluid passage 12 formed therein, the receiving hole 11 being formed at an end of the main body 1, the fluid passage 12 being configured to receive a fluid, the fluid passage 12 being connected to and in communication with the receiving hole 11. The fluid can be stored in the fluid passage 12 and is able to exit the main body 1 through the receiving hole 11. The refill 100 further comprises a first ball 2, a second ball 3 and a resilient member 4. The first ball 2 is disposed in the receiving hole 11 and is partially exposed outside the main body 1; the second ball 3 is disposed in the receiving hole 11, the second ball 3 being closer to the fluid passage 12 than the first ball 2, the second ball 3 being in abutment with the first ball 2, the first ball 2 being configured to cause the second ball 3 to rotate. The resilient member 4 is disposed in the fluid passage 12, one end of the resilient member 4 abutting against one end of the second ball 3 which is away from the first ball 2, the resilient member 4 being configured to apply a force to the second ball 3 which is directed towards the first ball 2.

[0030] Combination Figure 1 and Figure 2 For reference, in the above configuration, the pen refill 100 adopts a double-ball structure, with the second ball 3 supporting the first ball 2. The point contact between the balls reduces friction during writing and improves writing smoothness. At the same time, since the elastic element 4 always applies a force to the second ball 3 in the direction from the second ball 3 to the first ball 2, the stability of the position of the first ball 2 and the second ball 3 relative to the main body 1 can be ensured.

[0031] Specifically, the pen refill can switch between writing and non-use states. For the sake of simplicity and ease of understanding, the end of the pen refill 100 with the receiving hole 11 will be referred to as the "front end" and the end of the pen refill 100 away from the receiving hole 11 will be referred to as the "rear end".

[0032] When the pen refill 100 is in the writing state, that is, when the user uses the pen refill 100, the first ball bearing 2 rubs against the writing surface (such as paper, a desktop, etc., which are not limited in this application), thereby causing the first ball bearing 2 to rotate relative to the main body 1. The rotating first ball bearing 2 will drive the second ball bearing 3 to rotate. Due to the surface roughness, the fluid in the fluid channel 12 can adhere to the surface of the second ball bearing 3, and during the rotation of the second ball bearing 3, it will further adhere to the surface of the first ball bearing 2 through the contact point between the second ball bearing 3 and the first ball bearing 2, and then flow out of the pen refill 100 through the gap between the receiving hole 11 and the first ball bearing 2. Alternatively, the fluid adhering to the surface of the first ball bearing 2 can also rotate synchronously with the first ball bearing 2 and further adhere to the writing surface at the friction point between the first ball bearing 2 and the writing surface. At the same time, in the writing state, the writing surface will apply pressure to the first ball bearing 2 from the front end to the rear end, so that the first ball bearing 2 presses against the second ball bearing 3 in the direction from the front end to the rear end. Since the elastic element 4 always applies a force to the second ball 3 in the direction from the second ball 3 to the first ball 2, and the second ball 3 applies pressure to the first ball 2 from the rear end to the front end, the first ball 2 can always be partially exposed outside the main body in the writing state, avoiding the main body 1 from directly contacting the writing surface and affecting the writing experience.

[0033] When the pen refill 100 is not in use, that is, when the user is not using the pen refill, the elastic member 4 always applies pressure from the rear end to the front end to the second ball 3. The second ball 3 presses against the first ball 2 in the direction from the rear end to the front end. The first ball 2 abuts against the front end face 16 of the main body 1 in the receiving hole 11, so that the fluid cannot flow out through the gap between the receiving hole 11 and the first ball 2, thereby achieving the sealing of the pen refill 100.

[0034] The main body 1 further comprises a stop portion 15, and an end of the elastic member 4 away from the second ball 3 can abut against the stop portion 15. During processing, a person skilled in the art can design the position of the stop portion 15 according to actual needs, and therefore the stop portion 15 can be provided to configure the elastic member 4 with different lengths, thereby improving the design flexibility of the refill 100. It should be understood that the shape and number of the stop portion 15 shown in the drawings should be considered exemplary and non-limiting, and a person skilled in the art can set different numbers and shapes of the stop portion 15 according to actual needs, and the present application is not limited. Optionally, the stop portion 15 is integrally formed with the main body 1.

[0035] In the refill 100 of the present application, the elastic member 4 comprises a spring, which can be a flat-end spring with a flat end face, so that at the end of the elastic member 4 contacting the second ball 3, the contact area between the second ball 3 and the elastic member 4 is larger, and therefore the elastic member 4 can provide more stable and higher strength support for the second ball 3. Optionally, at least a portion of the end of the spring close to the second ball 3 has a cross-sectional diameter perpendicular to the central axis of the refill 100 greater than or equal to 0.6 mm and less than or equal to 0.9 mm, thereby ensuring sufficient support for the second ball 3 and not causing the flow passage 12 to have too large a flow diameter. Indeed, the elastic member 4 can also be, for example, a structure with a spring at the end contacting the second ball 3 and a column at the other end away from the second ball 3, and the present application is not limited.

[0036] With reference to the drawings in detail, Figure 3 Taking the single-side gap between the elastic member 4 and the flow passage 12 as the first gap 12a, the inventors have found that when the first gap 12a is too small, in order to prevent burrs on the wall of the flow passage 12 from hindering the movement of the spring, the processing precision needs to be increased accordingly, thereby resulting in high production cost. If the first gap 12a is too large, the elastic member 4 in the flow passage 12 has a large space for movement in the radial direction of the flow passage 12, causing the central axis of the elastic member 4 to deviate too much from the central axis of the refill 100 when the refill 100 is in a writing state, thereby causing the elastic member 4 to be unable to exert stable and uniform force on the second ball 3, and further affecting the writing effect and the sealing effect of the fluid.

[0037] After a large number of experiments, it has been found that the first gap 12a greater than or equal to 0.1 mm and less than or equal to 0.3 mm can control the production cost while limiting the movement direction of the spring, thereby ensuring the sealing effect of the fluid and the writing effect of the refill.

[0038] In the pen refill 100 of this application, the diameter 3d of the second ball is larger than the diameter 2d of the first ball, enabling the second ball 3 to seal the receiving hole 11 when the pen refill 100 is not in use. In an embodiment where the receiving hole 11 is a stepped hole composed of two holes with different diameters, the first ball 2 is located in the hole with the smaller diameter, and the second ball 3 is located in the hole with the larger diameter. When the pen refill 100 is not in use, the elastic member 4 presses the second ball 3 against the end face in the stepped hole. Since the diameter 3d of the second ball is larger, the second ball 3 can seal the end of the hole where the first ball 2 is located that is away from the front end face 16 of the main body 1, thereby further achieving a seal. In addition, when the pen refill 100 is in the writing state, the larger diameter of the second ball 3 can reduce the phenomenon of the second ball 3 shaking in the receiving hole 11, and thus ensure that the center of the first ball 2 and the center of the second ball 3 are both located on the central axis of the pen refill 100, improving the sealing performance for fluids and the writing experience.

[0039] Optionally, the surface roughness of the second bead 3 is greater than that of the first bead 2. The greater surface roughness of the second bead 3 allows more fluid from the fluid channel 12 to adhere to the pen refill 100 when it is in the writing state, increasing the fluid outflow of the pen refill 100; while the smaller surface roughness of the first bead 2 reduces friction with the writing surface, improving the writing smoothness of the pen refill 100. In some other embodiments, the surface roughness of the first bead 2 is greater than or equal to 0.012 μm and less than or equal to 0.25 μm. In still other embodiments, the surface roughness of the second bead 3 is greater than or equal to 0.25 μm. In other embodiments, the surface roughness of the second bead 3 is greater than that of the first bead 2, the surface roughness of the first bead 2 is greater than or equal to 0.012 μm and less than 0.25 μm, and the surface roughness of the second bead 3 is greater than or equal to 0.25 μm. Those skilled in the art can adjust the surface roughness of the second bead 3 according to specific needs, thereby precisely controlling the outflow of fluids with different physical properties and improving the applicability of the pen refill 100. For example, when the fluid has high fluidity, the surface roughness of the second ball 3 can be appropriately reduced to reduce the speed at which the fluid flows out of the pen refill 100; or when the fluid has low fluidity, the surface roughness of the second ball 3 can be appropriately increased to allow the fluid to flow out smoothly.

[0040] refer to Figure 2 and Figure 4 In the pen refill 100 of this application, the receiving hole 11 includes a first receiving portion 111, a connecting portion 112, and a second receiving portion 113. The first receiving portion 111 is located away from the elastic member 4 relative to the second receiving portion 113. The first receiving portion 111 is used to receive the first ball 2, the second receiving portion 113 is used to receive the second ball 3, one end of the connecting portion 112 is connected to the first receiving portion 111, and the other end of the connecting portion 112 is connected to the second receiving portion 113.

[0041] When the pen refill 100 is in the writing state, the connecting portion 112 is connected to the first receiving portion 111 and the second receiving portion 113. At this time, the first ball bearing 2 applies pressure from the front end to the rear end of the pen refill 100 to the second ball bearing 3, causing the second ball bearing 3 to rotate. This allows fluid to flow out of the pen refill 100 from the fluid channel 12 through the second receiving portion 113, the connecting portion 112, and the first receiving portion 111 in sequence. In addition, since the elastic element 4 is in a compressed state, the elastic element 4 applies pressure from the rear end to the front end of the second ball bearing 3. The second ball bearing 3 then applies pressure from the rear end to the front end of the first ball bearing 2. This avoids excessive friction between the first ball bearing 2 and the wall of the connecting portion 112 at the first connecting end face 114 between the first receiving portion 111 and the connecting portion 112 when the pen refill 100 is in the writing state, thereby improving the writing experience and extending the service life of the pen refill 100.

[0042] When the pen refill 100 is not in use, the connecting portion 112 is connected to the first receiving portion 111. Since the elastic element 4 is always in a compressed state, the elastic element 4 applies pressure from the rear end to the front end of the second ball 3, causing the second ball 3 to abut against the second connecting end face 115 between the second receiving portion 113 and the connecting portion 112. At this time, the fluid in the second receiving portion 113 cannot enter the connecting portion 112. In addition, the second ball 3 also applies pressure from the rear end to the front end of the first ball 2, causing the first ball 2 to abut against the front end face 16 of the main body portion 1 in the first receiving portion 111. This prevents the fluid in the connecting portion 112 and the first receiving portion 111 from flowing out of the pen refill 100 through the gap between the first ball 2 and the first receiving portion 111, thereby achieving a seal for the fluid in the pen refill 100.

[0043] It should be understood that, in this application, communication between different components means that fluid can pass through the gaps between the components and flow between them; when there are no gaps between different components or the existing gaps prevent fluid from passing through, the components are not connected.

[0044] Optionally, the first receiving portion 111 includes a limiting unit 1111, and the flow area of ​​the limiting unit 1111 perpendicular to the central axis of the pen refill 100 is smaller than the diameter 2d of the first ball bearing. This allows the first ball bearing 2 to abut against the limiting unit 1111 when the pen refill 100 is not in use, preventing the possibility of the first ball bearing 2 detaching from the front end of the pen refill 100 when the pen refill 100 is subjected to undesirable external forces. Furthermore, when the pen refill 100 is not in use, the first ball bearing 2 abutting against the limiting unit 1111 further prevents fluid from flowing out of the pen refill 100 through the gap between the first ball bearing 2 and the limiting unit 1111, ensuring a tight seal for fluid flow.

[0045] By configuring the first receiving portion 111, the connecting portion 112, the second receiving portion 113, and the arrangement of the two ball bearings with the aforementioned portions, the fluid flow and sealing effect are improved when the pen refill 100 switches between writing and non-use states. Furthermore, the first receiving portion 111 and the connecting portion 112 restrict the movement of the first ball bearing 2 along the central axis of the pen refill 100, allowing those skilled in the art to adjust the length of the first receiving portion 111 or the connecting portion 112 to adjust the distance the first ball bearing 2 can be pressed down when the pen refill 100 is in the writing state, thereby improving the writing experience. Of course, in other embodiments, the distance the first ball bearing 2 can be pressed down when the pen refill 100 is in the writing state can also be adjusted by regulating the performance of the elastic element 4.

[0046] In some embodiments, when the pen refill 100 is in a non-use state, at least a portion of the surface of the second ball bearing 3 abuts against the wall of the second receiving portion 113, preventing fluid in the fluid channel 12 from entering the second receiving portion 113 through the gap between the surfaces of the second ball bearing 3 and the second receiving portion 113, thus further sealing the fluid. When the pen refill 100 switches from a non-use state to a writing state, the second ball bearing 3 moves in the direction from the first ball bearing 2 toward the elastic member 4. The gap between the surface of the second ball bearing 3 and the wall of the second receiving portion 113 when the pen refill 100 is in a non-use state is designated as the second gap, and the gap between the surface of the second ball bearing 3 and the wall of the second receiving portion 113 when the pen refill 100 is in a writing state is designated as the third gap. The third gap is larger than the second gap, allowing fluid in the fluid channel 12 to flow smoothly into the second receiving portion 113 when the pen refill 100 is in a writing state, and then sequentially through the connecting portion 112 and the first receiving portion 111, thereby flowing out of the pen refill 100, ensuring smooth fluid flow and improving the writing experience of the pen refill 100.

[0047] The end face of the second receiving portion 113 near the fluid channel 12 is designated as the channel end face 116. Optionally, when the pen refill 100 is not in use, the maximum cross-section of the second ball 3 is flush with the end face of the second receiving portion 113 away from the connecting portion 112, that is, the diameter 3d of the second ball is located at the channel end face 116 (specifically as follows). Figure 2 and Figure 3(As shown). This arrangement ensures sealing performance and fluid flow while preventing the second ball 3 from wobbling in the fluid channel 12 during the writing state. If the diameter 3d of the second ball is located in the second receiving portion 113 (i.e., above the channel end face 116) when not in use, the first ball 2 needs to move a greater distance rearward during the writing state to allow the diameter 3d of the second ball to leave the second receiving portion 113 and for fluid to enter the second receiving portion 113. This arrangement not only fails to further improve the sealing performance in the non-use state but also reduces the gap between the second ball 3 and the second receiving portion 113 during the writing state, thus restricting fluid flow. If, when not in use, the diameter 3d of the second ball bead 3 is in the fluid channel 12 (i.e., below the channel end face 116), in order to achieve a seal, the cross-section of the second ball bead 3 at the maximum chord length in the second receiving portion 113 actually seals the channel end face 116. This is essentially equivalent to using a ball bead with a diameter equal to that chord length as the second ball bead 3. Compared to the scheme where the diameter 3d of the second ball bead is located at the channel end face 116, this arrangement does not further improve the sealing performance when not in use and also increases the possibility that the second ball bead 3 may wobble when writing.

[0048] In some embodiments, when the pen refill 100 is in a non-use or writing state, the single-sided gap between the first ball bearing 2 and the first receiving portion 111 is greater than or equal to 0.002 mm and less than or equal to 0.02 mm. This gap range prevents fluid that may remain in the connecting portion 112 and the first receiving portion 111 when the pen refill 100 is in a non-use state from flowing out of the pen refill 100 through this gap. When the pen refill 100 is in a writing state, the rotation of the first ball bearing 2 can drive the fluid in the connecting portion 112 to flow out, ensuring a fluid sealing effect while ensuring smooth writing. When the pen refill 100 is in a non-use state, the single-sided gap between the second ball bearing 3 and the second receiving portion 113 is greater than or equal to 0.002 mm and less than or equal to 0.02 mm. This gap range prevents fluid in the fluid channel 12 from flowing into the second receiving portion 113 through this gap when the pen refill 100 is in a non-use state, ensuring a fluid sealing effect. When the pen refill 100 is in the writing state, the single-sided gap between the second ball 3 and the second receiving portion 113 is greater than or equal to 0.005mm and less than or equal to 0.05mm. This gap range allows the rotation of the second ball 3 to drive the fluid in the fluid channel 12 into the second receiving portion 113 and flow into the connecting portion 112 when the pen refill 100 is in the writing state, ensuring the outflow of fluid and thus ensuring the smoothness of writing.

[0049] Of course, in other embodiments, it may be sufficient that when the pen refill 100 is in a non-use state or a writing state, the single-sided gap between the first ball bearing 2 and the first receiving portion 111 is greater than or equal to 0.002 mm and less than or equal to 0.02 mm. Alternatively, it may be sufficient that when the pen refill 100 is in a non-use state, the single-sided gap between the second ball bearing 3 and the second receiving portion 113 is greater than or equal to 0.002 mm and less than or equal to 0.02 mm. Alternatively, it may be sufficient that when the pen refill 100 is in a writing state, the single-sided gap between the second ball bearing 3 and the second receiving portion 113 is greater than or equal to 0.005 mm and less than or equal to 0.05 mm. This application is not limiting.

[0050] It should be understood that, taking the first ball 2 and the first receiving portion 111 shown in the attached figure as examples, the single-sided gap between the first ball 2 and the first receiving portion 111 referred to in this article refers to the difference between the cross-sectional radius of the first receiving portion 111 perpendicular to the central axis of the pen refill 100 and the cross-sectional radius of the first ball 2 perpendicular to the central axis of the pen refill 100.

[0051] refer to Figure 2 and Figure 4 In some embodiments, the flow area of ​​the connecting portion 112 perpendicular to the central axis of the pen refill 100 is smaller than the flow area of ​​the first receiving portion 111 perpendicular to the central axis of the pen refill 100. Compared to technical solutions where the flow area of ​​the connecting portion 112 is larger than the flow area of ​​the first receiving portion 111, or even larger than the flow area of ​​the second receiving portion 113, this arrangement can prevent some fluid from entering the connecting portion 112 and being unable or having difficulty entering the first receiving portion 111, thus reducing the amount of fluid residue in the connecting portion 112 and improving the fluid utilization rate.

[0052] Optionally, the first receiving portion 111 and the connecting portion 112 are connected by a first conical surface 117, and the second receiving portion 113 and the connecting portion 112 are connected by a second conical surface 118. In some embodiments, the first receiving portion 111 and the connecting portion 112 have a right-angle transition and / or the second receiving portion 113 and the connecting portion 112 have a right-angle transition. Fluid entering the first receiving portion 111 and the second receiving portion 113 will fill the right-angle position. However, during the rotation of the first ball 2 and the second ball 3, there is a possibility that the fluid in the right-angle position may have difficulty flowing out of the connecting portion 112 due to the rotation of the first ball 2 and the second ball 3, causing fluid to accumulate in the right-angle position. Therefore, the arrangement of the first conical surface 117 and the second conical surface 118 facilitates the flow of fluid in the first receiving portion 111 and the second receiving portion 113, prevents fluid accumulation in the first receiving portion 111 and the second receiving portion 113, and improves fluid utilization.

[0053] Of course, it is also possible that only the first receiving portion 111 and the connecting portion 112 are connected by the first conical surface 117, or only the second receiving portion 113 and the connecting portion 112 are connected by the second conical surface 118. This application is not limited.

[0054] Optionally, the connecting portion 112 includes a central hole unit 1121 and a flow guiding unit 1122. The flow guiding unit 1122 is disposed on the periphery of the central hole unit 1121 and extends outward along the periphery of the central hole unit 1121. One end of the central hole unit 1121 communicates with the first receiving portion 111, and the other end of the central hole unit 1121 communicates with the second receiving portion 113. One end of the flow guiding unit 1122 communicates with the first conical surface 117, and the other end of the flow guiding unit 1122 communicates with the second conical surface 118. With this arrangement, the fluid can have more sufficient flow space at the connecting portion 112 during the rotation of the first ball 2 and the second ball 3, thereby ensuring the smoothness of writing.

[0055] It should be understood that in embodiments without the first conical surface 117 and the second conical surface 118, one end of the flow guiding unit 1122 may be connected to the first receiving portion 111, and the other end of the flow guiding unit 1122 may be connected to the second receiving portion 113. This application does not limit this.

[0056] In other embodiments, see specific references. Figure 6 and Figure 7 The main body 1 includes a pen tip portion 13 and a pen body portion 14. A receiving hole 11 is provided in the pen tip portion 13. The cross-sectional area of ​​the pen tip portion 13 perpendicular to the central axis of the pen refill 100 is smaller than the cross-sectional area of ​​the pen body portion 14 perpendicular to the central axis of the pen refill 100. The thinner pen tip portion 13 provides better elasticity to the pen refill 100, thereby providing the user with a better writing experience. Taking the embodiment shown in the figure where the cross-sectional shape of the main body 1 perpendicular to the central axis of the pen refill 100 is circular as an example, if the diameter of the cross-section of the pen tip portion 13 perpendicular to the central axis of the pen refill 100 is taken as the pen tip diameter 13d, and the diameter of the cross-section of the pen body portion 14 perpendicular to the central axis of the pen refill 100 is taken as the pen body diameter 14d, then the pen tip diameter 13d is smaller than the pen body diameter 14d.

[0057] The inventors discovered that when the pen tip diameter 13d is too small, the rigidity of the pen tip portion 13 decreases, making it prone to breakage. When the pen tip diameter 13d is too large, the elasticity of the pen tip portion 13 decreases, failing to provide a good writing experience.

[0058] After extensive testing, it was found that the pen tip diameter is 13d, which is greater than or equal to 1.0mm and less than or equal to 1.3mm. At this point, the pen tip 100 has better elasticity and a better writing experience.

[0059] Optionally, the length of the pen tip portion 13 is greater than or equal to 3 mm and less than or equal to 3.5 mm. With a fixed pen tip diameter 13d, increasing the length of the pen tip portion 13 will increase elasticity while decreasing stiffness; conversely, decreasing the length will decrease elasticity and increase stiffness. Those skilled in the art can design the length of the pen tip portion 13 and the pen tip diameter 13d according to actual needs; this application does not impose limitations.

[0060] Furthermore, the fluid channel 12 located in the pen tip portion 13 is designated as the first flow channel 121, and the fluid channel 12 located in the pen body portion 14 is designated as the second flow channel 122. The flow area of ​​the first flow channel 121 perpendicular to the central axis of the pen refill 100 is smaller than the flow area of ​​the second flow channel 122 perpendicular to the central axis of the pen refill 100. This ensures that when the cross-sectional area of ​​the pen tip portion 13 is smaller than the cross-sectional area of ​​the pen body portion 14, the pen tip portion 13 has sufficient wall thickness to guarantee the structural strength of the pen refill 100. Moreover, compared to technical solutions where the flow areas of the first flow channel 121 and the second flow channel 122 are equal, the fluid storage capacity in the fluid channel 12 can be increased, extending the service life of the pen refill 100. Taking the embodiment where the cross-sectional shape of the fluid channel 12 perpendicular to the central axis of the pen refill 100 is circular as an example, the cross-sectional diameter of the first flow channel 121 perpendicular to the central axis of the pen refill 100 is taken as the first flow diameter 121d, and the cross-sectional diameter of the second flow channel 122 perpendicular to the central axis of the pen refill 100 is taken as the second flow diameter 122d. Then the first flow diameter 121d is smaller than the second flow diameter 122d.

[0061] The inventors discovered that when the first flow diameter 121d is too small, it not only increases the processing difficulty of the first flow channel 121, but also reduces the fluid storage capacity of the fluid channel 12. Furthermore, as the first flow channel diameter 121d decreases, the size of the elastic element 4 also decreases accordingly. In order for the elastic element 4 to support the second ball 3 of the same weight despite its smaller size, the requirements for the elasticity and strength of the elastic element 4 become higher, leading to increased production costs. Conversely, when the first flow diameter 121d is too large, it may result in a reduction in the wall thickness of the pen tip portion 13, thus causing insufficient strength in the pen tip portion 13.

[0062] After extensive experimentation, it was found that the preferred flow diameter of the first flow channel 121, perpendicular to the central axis of the pen refill 100, is between 0.7 mm and 1.0 mm, and the wall thickness of the pen tip portion 13 is between 0.15 mm and 0.8 mm. In this configuration, the fluid channel 12 can accommodate a larger volume of fluid while simultaneously ensuring the strength of the pen tip portion 13. Those skilled in the art can design the first flow diameter 121d according to actual conditions; this application does not limit such designs.

[0063] It should be understood that the pen refill 100 shown in the accompanying drawings has a circular cross-sectional shape perpendicular to its central axis, but this should be taken as an example and not a limitation. Those skilled in the art can design different cross-sectional shapes, such as triangles or polygons, according to actual needs, and this application is not limited.

[0064] refer to Figure 8 A second aspect of this application provides a pen 200, including a pen casing and a pen refill 100 as described in any of the foregoing embodiments, the pen refill 100 being located inside the pen casing.

[0065] The specific embodiments described herein are merely illustrative examples of the spirit of this application. Those skilled in the art to which this application pertains may make various modifications, additions, or use similar methods to replace the described specific embodiments, without departing from the spirit of this application or exceeding the scope defined by the appended claims.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A pen refill, characterized in that, The pen refill includes: The main body has an internal receiving hole and a fluid channel. The receiving hole is located at the end of the main body, and the fluid channel is used to receive fluid. The fluid channel and the receiving hole are connected and communicate with each other. The first ball is disposed in the receiving hole and partially exposed outside the main body; A second ball is disposed in the receiving hole, the second ball being closer to the fluid channel than the first ball, the second ball abutting against the first ball, and the first ball driving the second ball to rotate; and An elastic element is disposed in the fluid channel, one end of the elastic element abuts against the end of the second ball that is away from the first ball, and is used to apply a force to the second ball in the direction of the first ball. The receiving hole includes a first receiving portion, a connecting portion, and a second receiving portion, wherein the first receiving portion is located away from the elastic member relative to the second receiving portion; The first receiving portion is used to receive the first ball, the second receiving portion is used to receive the second ball, one end of the connecting portion is connected to the first receiving portion, and the other end of the connecting portion is connected to the second receiving portion; The pen refill can switch between a writing state and a non-use state. When the pen refill is in the writing state, the connecting portion is connected to the first receiving portion and the second receiving portion; when the pen refill is in the non-use state, the connecting portion is connected to the first receiving portion. When the pen lead is not in use, the maximum cross-section of the second ball is flush with the end face of the second receiving portion away from the connecting portion; When the pen tip switches from the non-use state to the writing state, the second ball moves in the direction from the first ball toward the elastic element; The gap between the surface of the second ball and the wall of the second receiving part when the pen refill is in a non-use state is taken as the second gap, and the gap between the surface of the second ball and the wall of the second receiving part when the pen refill is in a writing state is taken as the third gap, and the third gap is larger than the second gap; The surface roughness of the second bead is greater than that of the first bead; the surface roughness of the first bead is greater than or equal to 0.012 μm and less than or equal to 0.25 μm; the surface roughness of the second bead is greater than or equal to 0.25 μm.

2. The pen refill according to claim 1, characterized in that, The diameter of the second bead is larger than the diameter of the first bead.

3. The pen refill according to claim 1, characterized in that, The main body includes a pen tip portion and a pen body portion. The receiving hole is disposed in the pen tip portion. The cross-sectional area of ​​the pen tip portion perpendicular to the central axis of the pen refill is smaller than the cross-sectional area of ​​the pen body portion perpendicular to the central axis of the pen refill.

4. The pen refill according to claim 3, characterized in that, The fluid channel located in the pen tip portion is designated as the first flow channel, and the fluid channel located in the pen body portion is designated as including the second flow channel; The flow area of ​​the first flow channel perpendicular to the central axis of the pen refill is smaller than the flow area of ​​the second flow channel perpendicular to the central axis of the pen refill; and / or The wall thickness of the pen tip portion is greater than or equal to 0.15 mm and less than or equal to 0.8 mm.

5. The pen refill according to claim 1, characterized in that, The single-sided gap between the elastic element and the fluid channel is taken as the first gap, and the first gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

6. The pen refill according to claim 1, characterized in that, When the pen refill is in a non-use or writing state, the single-sided gap between the first ball and the first receiving portion is greater than or equal to 0.002 mm and less than or equal to 0.02 mm; and / or, When the pen refill is not in use, the single-sided gap between the second ball and the second receiving portion is greater than or equal to 0.002 mm and less than or equal to 0.02 mm; and / or, When the pen refill is in the writing state, the single-sided gap between the second ball and the second receiving part is greater than or equal to 0.005 mm and less than or equal to 0.05 mm.

7. The pen refill according to claim 1, characterized in that, The first receiving portion and the connecting portion are connected by a first conical surface; and / or, The second receiving portion is connected to the connecting portion via a second conical surface.

8. The pen refill according to claim 7, characterized in that, The connecting portion includes a central hole unit and a flow guiding unit, wherein the flow guiding unit is disposed on the periphery of the central hole unit and extends outward along the periphery of the central hole unit; One end of the central hole unit is connected to the first receiving portion, and the other end of the central hole unit is connected to the second receiving portion; One end of the flow guiding unit is connected to the first conical surface, and the other end of the flow guiding unit is connected to the second conical surface.

9. A pen, characterized in that, It includes a pen casing and a pen refill as described in any one of claims 1-8, wherein the pen refill is located inside the pen casing.

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