Ink cartridge and printing device thereof

Abstract

The utility model provides a kind of ink cartridge and its printing device, it is related to ink-jet printing consumables technical field;Ink cartridge includes ink cartridge body, is provided with ink hole and air inlet hole;Side cover, the side cover with the ink cartridge body cooperation and form first cavity and second cavity;Isolation chamber, the isolation chamber is respectively communicated with the first cavity and the second cavity;First valve assembly;And second valve assembly;The utility model is internally provided with the isolation chamber of communication with the first cavity and the second cavity respectively, can separate the first cavity and the second cavity, simultaneously due to the effect of isolation chamber, when ink in the second cavity is continuously consumed, the second cavity can form negative pressure, external air can pass through second cavity, isolation chamber and first cavity in turn, to eliminate negative pressure, to improve the air pressure balance inside ink cartridge in turn. Simultaneously due to the effect of isolation chamber, ink cartridge can keep ink outlet smooth, avoid the situation that ink cannot be discharged.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing consumables technology, and in particular to an ink cartridge and its printing device. Technical Background

[0002] Removable ink cartridges used in inkjet printers typically have an ink outlet and an air inlet. During operation, the printer injects air into the ink cartridge through the air inlet, causing the elastic air chamber connected to the air inlet to expand and deform, thereby squeezing ink out of the ink outlet and then delivering it to the print head through the ink tubing. Under the control of an electrical signal, the print head precisely sprays the ink onto the surface of media such as paper to form text or images.

[0003] In early ink cartridges that used a single ink storage chamber, the negative pressure inside the chamber would continuously increase as the ink was consumed. This ever-increasing negative pressure was like continuously squeezing a hollow rubber ball. When the pressure exceeded the material's tolerance limit, the chamber would be permanently flattened and unable to recover, ultimately rendering the entire ink cartridge unusable.

[0004] To address these issues, modern ink cartridges have been redesigned with multiple interconnected small cavities. These cavities are separated by partitions and connected only by narrow channels. This structure distributes the negative pressure on individual cavities, preventing permanent deformation. However, this design also introduces new drawbacks. First, the narrow channels between cavities significantly restrict ink flow, much like drinking a viscous beverage through a thin straw; the ink struggles to flow smoothly between the cavities. Furthermore, some cavities, especially those far from the ink outlet, cannot be emptied due to insufficient driving force, resulting in ink accumulation in the corners of the cartridge. These problems not only waste a significant amount of ink but also cause printing errors such as broken lines and missing colors. Currently, the industry urgently needs a new cartridge structure that can balance cavity pressure while ensuring smooth ink emptying. Utility Model Content

[0005] This invention provides an ink cartridge and its printing device, which can eliminate the risk of permanent plastic deformation caused by concentrated negative pressure on a single cavity, ensure that the ink cartridge maintains its structure during long-term use, and at the same time maintain smooth ink flow and avoid ink not being completely drained.

[0006] Firstly, this utility model provides an ink cartridge that stores ink, including...

[0007] The ink cartridge body is provided with an ink outlet and an air inlet, and the ink outlet and the air inlet are respectively connected to the printing device;

[0008] A side cover, which mates with the ink cartridge body to form a first cavity and a second cavity;

[0009] An isolation cavity, wherein the isolation cavity is respectively connected to the first cavity and the second cavity;

[0010] A first valve assembly, disposed on the ink cartridge body, is configured to discharge ink from the first cavity in response to air intake through the air inlet; and

[0011] A second valve assembly, disposed on the cartridge body, is used to introduce outside air into the second cavity in response to a pressure in the cartridge body being less than a threshold.

[0012] Furthermore, the isolation cavity includes

[0013] A first connection port is located in the first cavity;

[0014] A second connection port is located in the second cavity; and

[0015] A connecting channel is provided, which is connected to the first connecting port and the second connecting port respectively.

[0016] Furthermore, the projection of the first connection port in the first direction and the projection of the second connection port in the first direction overlap.

[0017] Furthermore, the projections of the first and second connection ports in the first direction are closer to the bottom of the cartridge body than the projection of the second valve assembly in the first direction.

[0018] Furthermore, the connecting channel includes at least two interconnected connecting paths, and the number of the connecting paths is even.

[0019] Furthermore, the ink cartridge also includes an ink dispensing assembly located in the first cavity, which includes...

[0020] A mating component, wherein the mating component is installed within the ink outlet hole; and

[0021] An ink outlet tube, which is connected to the ink outlet hole and the first cavity.

[0022] Furthermore, the ink outlet tube is provided with at least two through holes, one of which is located above the ink outlet tube.

[0023] Furthermore, the cartridge body also includes a first valve chamber and a second valve chamber, with the first valve assembly at least partially disposed within the first valve chamber and the second valve chamber. The first valve chamber is in gas communication with the air inlet, and the second valve chamber is in fluid communication with the first chamber.

[0024] Furthermore, the projections of the first valve cavity in the first direction, the second valve cavity in the first direction, and the isolation cavity in the first direction overlap.

[0025] Furthermore, the first valve assembly includes:

[0026] The first valve seat is located on the ink cartridge body;

[0027] A first elastic element is located on the first valve seat;

[0028] A first valve diaphragm, detachably mounted to the first valve seat and abutting against the first elastic member, allows ink to be discharged from the ink outlet through deformation of the first valve diaphragm; and

[0029] A first valve cover is detachably mounted on the ink cartridge body.

[0030] Furthermore, the cartridge body also includes a third valve chamber and a fourth valve chamber, with the second valve assembly at least partially disposed within the third valve chamber and the fourth valve chamber. The third valve chamber is in communication with atmospheric gas, and the fourth valve chamber is in fluid communication with the second chamber.

[0031] Furthermore, the second valve assembly includes

[0032] The second valve seat is located on the ink cartridge body;

[0033] The second elastic element is located on the second valve seat;

[0034] A second valve diaphragm, detachably mounted to the second valve seat and abutting against the second elastic element, the second valve diaphragm having a valve orifice that opens when the pressure on the cartridge body is less than a threshold; and

[0035] The second valve cover is detachably mounted on the ink cartridge body.

[0036] Furthermore, the ink cartridge body also includes an air vent, which is connected to atmospheric gas in the third valve chamber.

[0037] Secondly, this utility model also provides a printing device, including a print head and an ink cartridge as described above. The print head includes a pump and an ink flow channel. The pump is connected to the air inlet, and the ink flow channel is connected to the ink outlet.

[0038] This invention provides an ink cartridge and its printing device. An internal isolation chamber, connected to both a first chamber and a second chamber, separates the two chambers. Simultaneously, due to the function of the isolation chamber, when ink in the second chamber is continuously consumed, a negative pressure is created within the second chamber. Outside air can then pass sequentially through the second chamber, the isolation chamber, and the first chamber to eliminate this negative pressure, thereby improving the internal pressure balance of the ink cartridge. Furthermore, the isolation chamber ensures smooth ink flow and prevents ink from being completely drained. Attached Figure Description

[0039] Figure 1 This is an exploded view of the ink cartridge of this utility model;

[0040] Figure 2 This is a cross-sectional view of a first embodiment of the ink cartridge of this utility model;

[0041] Figure 3 This is a cross-sectional view of a second embodiment of the ink cartridge of this utility model;

[0042] Figure 4 A cross-sectional view of the interior of the ink cartridge of this utility model. Figure 1 (Air intake status at the air vent);

[0043] Figure 5 A cross-sectional view of the interior of the ink cartridge of this utility model. Figure 2 (Air intake status). Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used in this embodiment of the invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined in this embodiment of the invention.

[0046] The terms "center," "upper," "lower," "left," "right," "vertical," and "horizontal" used in this embodiment of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this embodiment is in use. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0047] The terms "first," "second," and similar words used in this embodiment of the invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a," "one," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Likewise, the terms "including" or "comprising" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The steps preceding or following the steps in the method of this embodiment of the invention do not necessarily have to be performed precisely in sequence. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0048] This invention addresses the technical problem of air bubbles accumulating in the ink outlet of an ink cartridge, leading to excessive air buildup in the printhead, which negatively impacts print quality and drastically reduces printhead lifespan. The invention discloses an ink cartridge and its printing device, comprising an ink cartridge and a printing device. The ink cartridge is typically detachably installed within the printing device body for easy installation and removal. The detachable connection between the ink cartridge and the printing device body includes, but is not limited to, a sliding connection. In this embodiment, the detachable connection method between the ink cartridge and the printer body is not limited.

[0049] The printhead has print nozzles that spray fluid droplets onto the printing medium, which then dries to form an image. An ink reservoir or supply (i.e., a cartridge) is fluidly connected to the printhead to supply ink to the print nozzles. To reduce operating costs, some printing devices employ individually replaceable ink supplies so that the printhead is not discarded when the ink supply is depleted. In this embodiment, the structure of the printhead is not limited.

[0050] The following embodiment uses an inkjet printer as an example to further illustrate the ink cartridge in this embodiment.

[0051] like Figure 1As shown, this utility model discloses an ink cartridge 10 that stores ink. It includes a cartridge body 1 with an ink outlet 11 and an air inlet 12. The ink outlet 11 is in liquid communication with the ink flow channel in a printhead (not shown), allowing ink from the cartridge body 1 to be transferred to the ink flow channel via the ink outlet 11, and then to the interior of the printhead, where it is extruded from the print nozzles. The air inlet 12 is connected to a pump in the printhead. Specifically, the printhead has a coupler (not shown, made of rubber sealing material) with a channel. One end of the channel is connected to the air inlet 12, and the other end is connected to a pressure source (e.g., a pump). Gas from the pump is delivered to the interior of the cartridge body 1 via the channel and the air inlet 12, increasing the volume pressure within the cartridge body 1 and extruding ink.

[0052] To better illustrate the structure of this ink cartridge, the cartridge body 1 has a first surface 31 and a second surface 32. A sticker (not shown) is provided on the first surface 31, and a side cover 2 is provided on the second surface 32. The side cover 2 cooperates with the cartridge body 1 to form a first cavity 13 and a second cavity 14, which are connected by an isolation cavity 4. The second cavity 14 primarily stores most of the ink and can be called the ink storage cavity, while the first cavity 13 primarily stores a small portion of the ink and can be called the ink supply cavity. The ink is typically discharged from the ink outlet 11 of the first cavity 13. Generally, the volume of the second cavity 14 is larger than that of the first cavity 13 to allow more ink to be stored within it. As the ink in the first cavity 13 decreases, ink from the second cavity 14 is transferred to the first cavity 13 through the isolation cavity 4 to ensure that the first cavity 13 always has a certain amount of ink available for discharge.

[0053] It should be noted that, as Figure 2As shown, an isolation cavity 4 is disposed at the connection between the second cavity 14 and the first cavity 13. The isolation cavity 4 includes a first connection port 41 and a second connection port 42, wherein the first connection port 41 is located in the first cavity 13, and the second connection port 42 is located in the second cavity 14. The first connection port 41 and the second connection port 42 are connected through a connecting flow channel 43. Specifically, the first connection port 41 is located at the bottom of the first cavity 13, and the second connection port 42 is located at the bottom of the second cavity 14. The connecting flow channel 43 includes multiple connecting flow paths 431, which are interconnected and respectively connect to the first connection port 41 and the second connection port 42. In some embodiments, the number of connecting flow paths 431 is even, which ensures that the first connecting port 41 at the bottom of the first cavity 13 and the second connecting port 42 at the bottom of the second cavity 14 are on the same horizontal line in the length direction (first direction X) of the ink cartridge, thereby ensuring that the ink in the second cavity 14 can be delivered to the first cavity 13 through the second connecting port 42, the connecting flow path 431 and the first connecting port 41 as much as possible, and avoiding the situation where the ink cannot be completely drained.

[0054] like Figure 2 As shown, in some embodiments, there are six connecting flow paths 431. Each connecting flow path 431 extends from the height direction (third direction Z) towards the top of the cartridge body 1 in the form of a flow channel. The six connecting flow paths 431 are evenly arranged sequentially in the first direction X. Viewed from the first direction X, the connecting flow path 431 closest to the first cavity 13 is in fluid communication with the first connection port 41, the connecting flow path 431 closest to the second cavity 14 is in fluid communication with the second connection port 42, and the remaining connecting flow paths 431 are connected end to end.

[0055] like Figure 3 As shown, in some embodiments, to ensure that the smaller ink cartridge can be smoothly emptied of ink while reducing unnecessary connecting flow paths, thereby increasing the ink storage capacity of the smaller ink cartridge, two connecting flow paths 431 are provided. Each connecting flow path 431 extends from the height direction (third direction Z) towards the top of the ink cartridge body 1 in the form of a flow channel, and the two connecting flow paths 431 are evenly arranged sequentially in the first direction X. Viewed from the first direction X, the connecting flow path 431 closest to the first cavity 13 is in fluid communication with the first connection port 41, and the connecting flow path 431 closest to the second cavity 14 is in fluid communication with the second connection port 42.

[0056] like Figure 2-3As shown, the ink cartridge also includes an ink dispensing assembly that communicates with a liquid pen in the printhead, which has an ink flow channel, to expel ink from the first cavity 13. Specifically, the ink dispensing assembly is located in the first cavity 13 and includes a mating member 111, which is installed within the ink dispensing hole 11; and an ink dispensing tube 112, which communicates with the ink dispensing hole 11 and the first cavity 13. The ink dispensing tube has at least two through holes 1121, one of which is located above the ink dispensing tube 112. In some embodiments, two through holes 1121 are provided. One through hole 1121 is located on the periphery of the ink outlet tube 112 and close to the isolation cavity 4. The other through hole 1121 is located above the ink outlet tube 112 and close to the air inlet 12, so as to draw away air bubbles (air) in the print head during the printing process, so as to prevent excessive air accumulation in the print head, which would affect the printing quality (such as topping) and cause a sudden reduction in the service life of the print head.

[0057] In some embodiments, in order to increase the pressure inside the ink cartridge body 1 so that the ink inside the ink cartridge body 1 can be squeezed out from the ink outlet 11, the ink cartridge further includes a first valve assembly 15. The first valve assembly 15 is disposed on the ink cartridge body 1 to increase the pressure of the ink cartridge body 1 in response to the air intake 12, so as to discharge the ink from the ink outlet 11.

[0058] In this embodiment, as Figure 1 and 5As shown, the first valve assembly 15 includes a first valve seat 151, a first elastic element 152, a first valve diaphragm 153, and a first valve cover 154. The first valve seat 151 is located on the first surface 31 of the ink cartridge body 1 and is recessed into the ink cartridge body 1 along the thickness direction (second direction Y). The first valve seat 151 has a first opening 1511 to allow fluid communication between the first valve seat 151 and the first cavity 14. The first valve diaphragm 153 is made of rubber and is disposed on the first valve seat 151, with its edge tightly abutting the inner wall of the first valve seat 151. It is responsive to air intake or deprivation at the air inlet 12. The first elastic element 152 is connected at one end to the first valve seat 151 and at the other end to the center of the first valve diaphragm 153 near the center of the cartridge body 1. It extends and compresses following the displacement of the second valve diaphragm 153. The first valve cover 154 is located on the first valve seat 151 and is used to cover the first valve cover 154. The end of the first valve cover 154 is provided with a first positioning post 1541 and a first cover opening 1542. Air from the pump enters the first cover opening 1542 covered by the sticker from the air inlet 12 and then enters the first valve seat 151. Specifically, the first valve cavity P1, which is connected to the air inlet 12, is formed above the first valve diaphragm 153, the first valve seat 151, and the first valve cover 154. The second valve cavity P2, which is connected to the first valve diaphragm 153, is formed below the first valve diaphragm 153, the first valve seat 151, and the first valve cover 154.

[0059] In order for air to enter the first valve chamber P1 through the air inlet 12, an air inlet channel 121 is also provided on the cartridge body 1. When the pump injects air, the air will flow like... Figure 5 The air intake path S1 shown reaches the first valve chamber P1 via the air intake hole 12 and the air intake channel 121. At this time, as the air in the first valve chamber P1 continuously increases, the first valve diaphragm 153 moves and deforms towards the ink cartridge body 1, compressing the first elastic element 152. Simultaneously, this causes the volume of the second cavity 14, which is connected to the second valve chamber P2, to continuously decrease and the pressure to continuously increase, thereby driving the ink to flow... Figure 3 and 4 The ink outlet path S2 shown originates from the first opening 1511 of the second valve chamber P2, the first chamber 13, and converges from the second chamber 14 via the second connection port 42, multiple connecting flow paths 431, and the first connection port 41, finally exiting through the through hole 1121 of the ink outlet pipe 112 and the ink outlet hole 11. When the pump stops pumping air, the first valve diaphragm 153 and the first elastic element 152, made of rubber material, return to their original state.

[0060] In some embodiments, the first valve seat 151 is provided with a first positioning groove 1512. In addition, when the first positioning post 1541 is installed on the first valve seat 151 along with the first valve cover 154, the first positioning post 1531 on the first valve cover 154 can be positioned on the first positioning groove 1512 so that the first valve cover 154 can be installed on the first valve seat 151 according to the pre-positioning.

[0061] In some embodiments, in order to ensure the pressure balance of the ink cartridge and prevent structural deformation due to excessive pressure, a second valve assembly 16 for balancing the ink cartridge pressure is provided inside the ink cartridge body 1. The second valve assembly 16 is provided on the ink cartridge body 1 to introduce outside air into the ink cartridge body 1 in response to when the air inlet 12 stops air intake or the pressure of the ink cartridge body 1 is less than a threshold, or when the air inlet 12 stops air intake and the pressure of the ink cartridge body 1 is less than the threshold, so as to ensure that the pressure of the ink cartridge is within a controllable range and prevent structural deformation of the ink cartridge.

[0062] In this embodiment, as Figure 1 and 4 As shown, the second valve assembly 16 includes a second valve seat 161, a second elastic element 162, a second valve diaphragm 163, and a second valve cover 164. The second valve seat 161 is located on the first surface 31 of the ink cartridge body 1 and is recessed into the ink cartridge body 1 along the thickness direction of the ink cartridge body 1. The second valve seat 161 has a second opening 1613 so that the second valve seat 161 can be fluidly connected to the first cavity 13 through the second opening 1613. The second elastic element 162 is a spring, which is arranged in a direction parallel to the thickness direction (second direction Y) of the ink cartridge, and one end is connected to the second valve seat 161, and the other end is connected to the second valve diaphragm 163. The second valve diaphragm 163 is made of rubber material and is disposed on the second valve seat 161, and its edge is in close contact with the inner wall of the second valve seat 161. The second valve cover 164 is detachably installed on the ink cartridge body 1 and covers the second valve diaphragm 163.

[0063] In this embodiment, as Figure 1 and 4 As shown, the ink cartridge body 1 also includes an air guide hole 1612, which is located on the top of the ink cartridge body 1. It communicates with the air guide channel 1611 to the third valve chamber P3 formed between the second valve diaphragm 163 and the second valve cover 164. The second valve diaphragm 163 and the second valve seat 161 form a fourth valve chamber P4 that communicates with the second cavity 14.

[0064] In this embodiment, as Figure 1 and 4As shown, the second valve diaphragm 163 has a protrusion 1631 in the middle, and a through valve hole 1632 in the protrusion 1631. The valve hole 1632 closes when air enters through the air inlet 12. Because air enters through the air inlet 12, the pressure in both the second cavity 14 and the first cavity 13 increases. At this time, the pressure in the fourth valve cavity P4, which is connected to the second cavity 14, also increases. Simultaneously, due to the action of the spring, the second valve diaphragm 163 moves towards the second valve cover 164 until the protrusion 1631 abuts against the second valve cover 164, thereby closing the valve hole 1632. Conversely, When air intake 12 stops intake or the pressure of the ink cartridge body 1 is less than the threshold, or when air intake 12 stops intake and the pressure of the ink cartridge body 1 is less than the threshold, a negative pressure is formed in the first cavity 13 due to the continuous reduction of ink. This causes the external atmospheric pressure connected to the third valve cavity P3 to be greater than the pressure in the first cavity 13 connected to the fourth valve cavity P4. Consequently, the second valve diaphragm 163 moves towards the second valve seat 161, causing the second protrusion 1631 to move away from the second valve cover 164. This opens the valve hole 1632 on the protrusion 1631, allowing external air to enter. Figure 4 The air is conveyed through the air guide path S3 from the air guide hole 1612, the third valve chamber P3, the valve hole 1632, and the fourth valve chamber P4 to the first chamber 13; the valve hole 1632 on the second valve diaphragm 163 can be closed or opened as needed to prevent ink from the first chamber 13 from flowing out of the valve hole 1632 into the air guide hole 1612.

[0065] In some embodiments, such as Figure 1 , 4 As shown, the second valve seat 161 includes a second positioning groove 1611, and the second valve cover 164 is provided with a second positioning post 1642. At the same time, the second positioning post 1642 is provided with a cover opening 1641 for communicating with the third valve chamber P3 and the air guide channel 1611. When the second valve cover 164 is installed on the second valve seat 161, the second positioning post 1642 on the first valve cover 154 can be positioned on the second positioning groove 1611, so that the second valve cover 164 can be installed on the second valve seat 161 according to the pre-positioning.

[0066] In some embodiments, a sponge (not shown) is added inside the air duct 1611 to prevent ink from flowing out of the air duct 1611.

[0067] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An ink cartridge storing ink, characterized by, include The ink cartridge body is provided with an ink outlet and an air inlet, and the ink outlet and the air inlet are respectively connected to the printing device; A side cover, which mates with the ink cartridge body to form a first cavity and a second cavity; An isolation cavity, wherein the isolation cavity is respectively connected to the first cavity and the second cavity; A first valve assembly is disposed on the ink cartridge body to discharge ink from the first cavity in response to air intake through the air inlet. and A second valve assembly, disposed on the cartridge body, is used to introduce outside air into the second cavity in response to a pressure in the cartridge body being less than a threshold.

2. The ink cartridge of claim 1, wherein The isolation cavity includes A first connection port is located in the first cavity; The second connection port is located in the second cavity; and A connecting channel is provided, which is connected to the first connecting port and the second connecting port respectively.

3. The ink cartridge of claim 2, wherein The projection of the first connection port in the first direction and the projection of the second connection port in the first direction overlap.

4. The ink cartridge of claim 3, wherein The projections of the first and second connection ports in the first direction are closer to the bottom of the cartridge body than the projection of the second valve assembly in the first direction.

5. The ink cartridge of claim 2, wherein The connecting channel includes at least two interconnected connecting paths, and the number of the connecting paths is even.

6. The ink cartridge of claim 3, wherein The ink cartridge also includes an ink dispensing assembly located in the first cavity, which includes... The mating component is installed inside the ink outlet hole; and An ink outlet tube, which is connected to the ink outlet hole and the first cavity.

7. The ink cartridge of claim 6, wherein The ink outlet tube is provided with at least two through holes, one of which is located above the ink outlet tube.

8. The ink cartridge of any one of claims 1-7, wherein, The ink cartridge body also includes a first valve chamber and a second valve chamber. The first valve assembly is at least partially disposed in the first valve chamber and the second valve chamber. The first valve chamber is in gas communication with the air inlet, and the second valve chamber is in fluid communication with the first chamber.

9. The ink cartridge of claim 8, wherein, The projections of the first valve cavity in the first direction, the second valve cavity in the first direction, and the isolation cavity in the first direction overlap.

10. The ink cartridge of claim 8, wherein The first valve assembly includes: The first valve seat is located on the ink cartridge body; A first elastic element is located on the first valve seat; A first valve diaphragm, detachably mounted to the first valve seat and abutting against the first elastic member, allows ink to be discharged from the ink outlet through deformation of the first valve diaphragm; and A first valve cover is detachably mounted on the ink cartridge body.

11. The ink cartridge of any one of claims 1-7, wherein, The cartridge body also includes a third valve chamber and a fourth valve chamber, and the second valve assembly is at least partially disposed in the third valve chamber and the fourth valve chamber. The third valve chamber is in communication with atmospheric gas, and the fourth valve chamber is in fluid communication with the second chamber.

12. The ink cartridge of claim 11, wherein, The second valve assembly includes The second valve seat is located on the ink cartridge body; The second elastic element is located on the second valve seat; A second valve diaphragm, detachably mounted to the second valve seat and abutting against the second elastic element, the second valve diaphragm having a valve orifice that opens when the pressure on the cartridge body is less than a threshold; and The second valve cover is detachably mounted on the ink cartridge body.

13. The ink cartridge of claim 11, wherein, The ink cartridge body also includes an air vent, which is connected to the atmospheric gas in the third valve chamber.

14. A printing device, characterized by: The device includes a printhead and an ink cartridge as described in any one of claims 1-13, wherein the printhead includes a pump and an ink flow channel, the pump being connected to the air inlet and the ink flow channel being connected to the ink outlet.

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