Ink cartridge and ink cartridge control system

Abstract

The present invention provides an ink cartridge and an ink cartridge control system, which relates to the field of printer components and control technology. The ink cartridge includes a shell, and the inside of the shell has a liquid storage chamber for accommodating ink; the liquid storage chamber includes a first chamber and a second chamber connected at the bottom; an isolating member is provided in the first chamber to separate the first chamber into a first air pressure chamber and a liquid storage chamber, and the first air pressure chamber and the liquid storage chamber balance the pressure in the two chambers through the deformation or displacement of the isolating member in the first chamber; the upper part of the second chamber has a second air pressure chamber for maintaining the liquid level in the second chamber; the ink cartridge has the advantages of maintaining a stable ink output, avoiding contact between ink and gas, and preventing the ink from deteriorating.

Description

Technical Field

[0001] The invention belongs to the field of printer components and control technology, and in particular relates to an ink cartridge and an ink cartridge control system. Background Art

[0002] With the continuous advancement of printed electronics technology, conductive fluids represented by liquid metal have emerged, making it possible to print wires to make liquid metal flexible electronic circuits. This has not only changed the traditional PCB hard electronic circuit manufacturing model, but also greatly reduced the time and cost of electronic circuit manufacturing. Liquid metal printing technology has unique advantages in the rapid manufacturing of flexible circuits, PCB printed circuit boards, antennas and other electronic devices, and has a very broad application prospect.

[0003] On the one hand, the existing ink cartridge control mainly uses air as the negative pressure control gas in the ink cartridge to maintain the stable ink discharge of the liquid metal ink in the ink cartridge under the action of negative pressure. However, since liquid metal can easily undergo oxidation reaction with air, thereby producing oxide impurities, it not only consumes the normal ink content, but also has a certain degree of impact on the ink discharge efficiency and printing effect; especially when the ink cartridge shakes, it will cause the contact surface between the liquid metal and the air, thereby leading to the formation of excessive oxides, aggravating the deterioration of the ink and easily causing ink discharge blockage.

[0004] On the other hand, the current liquid metal printer's ink output control mainly utilizes the liquid metal's own weight and negative pressure to control the ink output. At the beginning, since the ink height is in an initial state, the predetermined ink output is maintained under the action of negative pressure. However, as the ink decreases, the negative pressure value in the ink chamber will continue to increase, making it impossible for the ink output of the ink cartridge to continue to maintain the expected state, resulting in a decrease in ink output or even ink shortage. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an ink cartridge to solve the problem of easy oxidation of ink in the ink cartridge and unstable ink discharge in the prior art.

[0006] In some illustrative embodiments, the ink cartridge comprises: a shell, the interior of the shell having a liquid storage chamber for containing ink; the liquid storage chamber comprises a first chamber and a second chamber connected at the bottom; an isolation member is provided in the first chamber to separate the first chamber into a first air pressure chamber and a liquid storage chamber, the first air pressure chamber and the liquid storage chamber balance the pressures in the two chambers through the deformation or displacement of the isolation member in the first chamber; the upper part of the second chamber has a second air pressure chamber for maintaining the liquid level height in the second chamber.

[0007] In some optional embodiments, the isolation member is an elastic oxygen-isolating member that fits the ink liquid surface; the first chamber has an assembly structure for fixing the elastic oxygen-isolating member, and the edge of the elastic oxygen-isolating member is fixed to the assembly structure.

[0008] In some optional embodiments, the isolation member is a piston body that fits the ink liquid surface; the piston body forms a clearance fit with the inner wall of the first chamber.

[0009] In some optional embodiments, the isolation member is one or more piston bodies that are in contact with the ink liquid surface; a baffle structure is provided in the middle of the first chamber, and the baffle structure divides the middle part of the first chamber into partitions corresponding to the number of the piston bodies; both ends of the partition are open, respectively connected to the two ends of the first chamber separated by the baffle structure; wherein, a gap is formed between one or more of the piston bodies and the inner wall of the corresponding partition.

[0010] In some optional embodiments, the ink cartridge further includes: a limiting structure for limiting the displacement distance of the piston body in the corresponding partition.

[0011] In some optional embodiments, the distance between any one of the openings at both ends of the partition and the inner wall of the first chamber adjacent to and opposite to it is smaller than the thickness of the piston body, and the ends of the openings at both ends of the partition constitute the limiting structure of the piston body.

[0012] In some optional embodiments, the housing is provided with a first air port communicating with the first air pressure chamber, and a liquid port communicating with the liquid storage chamber; wherein the first air port is located above the liquid level, and the liquid port is located below the liquid level.

[0013] In some optional embodiments, the shell is provided with a liquid injection port connected to the liquid storage cavity of the first chamber, and the liquid injection port is located above the liquid level.

[0014] In some optional embodiments, the shell is provided with a second air port connected to the second air pressure cavity of the second chamber.

[0015] In some optional embodiments, the liquid port on the shell is connected to a print head.

[0016] The present invention provides an ink cartridge, which can maintain the basic stability of the ink level in the second chamber by utilizing the air pressure in the second air pressure chamber through a closed second air pressure chamber formed in the second chamber, thereby avoiding the problem of huge changes in the hydraulic pressure at the liquid outlet, which affects the ink output; on the other hand, by setting a deformable / displaceable isolation piece to separate the first air pressure chamber and the liquid storage chamber, the contact between the ink and the gas can be effectively prevented, thereby preventing the ink from deteriorating.

[0017] On the other hand, another object of the present invention is to provide an ink cartridge control system to solve the technical problems existing in the prior art.

[0018] In some illustrative embodiments, the ink cartridge control system includes: the ink cartridge described in any one of the above items, as well as a pressure sensor and an air control system; the pressure sensor is located in the liquid storage chamber of the ink cartridge, and is used to detect the pressure value in the liquid storage chamber; the output end of the air control system that provides external control air pressure is connected to the first air port of the ink cartridge, and is used to regulate the air pressure value in the liquid storage chamber; the pressure sensor, the air control system and the preset pressure value together constitute a pressure closed-loop control of the ink cartridge.

[0019] The present invention proposes an ink cartridge control system, which has the above-mentioned ink cartridge, so that the control system has the directional advantages of the ink cartridge, and through the closed-loop control of the cavity pressure formed by the pressure sensor, the air control system and the preset pressure value, the ink output of the ink cartridge can be accurately maintained in a constant state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structure of the ink cartridge before filling in an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the ink cartridge after filling in an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the ink cartridge in the embodiment of the present invention Figure 2 ;

[0023] Figure 4 Schematic diagram of the structure of the ink cartridge in the embodiment of the present invention Figure 3 ;

[0024] Figure 5 Schematic diagram of the structure of the ink cartridge in the embodiment of the present invention Figure 4 ;

[0025] Figure 6 Schematic diagram of the structure of the ink cartridge in the embodiment of the present invention Figure 5 ;

[0026] Figure 7 Schematic diagram of the structure of the ink cartridge in the embodiment of the present invention Figure 6 ;

[0027] Figure 8 Schematic diagram of the baffle structure in an embodiment of the present invention Figure 1 ;

[0028] Fig. 9 Schematic diagram of the baffle structure in an embodiment of the present invention Figure 2 ;

[0029] Fig.10 The structure of the ink cartridge control system in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0030] Fig.11 is a schematic structural diagram of an ink cartridge control system before ink is discharged in an embodiment of the present invention;

[0031] Fig.12 It is a schematic diagram of the structure of the ink cartridge control system after ink discharge in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following description and the accompanying drawings fully illustrate specific embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The examples represent possible variations only. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, and all available equivalents of the claims. In this article, these embodiments of the present invention may be represented individually or collectively by the term "invention", which is merely for convenience, and if more than one invention is disclosed in fact, it is not intended to automatically limit the scope of the application to any single invention or inventive concept.

[0033] It should be noted that the various technical features in the embodiments of the present invention can be combined with each other without conflict.

[0034] The present invention provides an ink cartridge, specifically, as Figure 1-2 As shown, Figure 1 This is a schematic diagram of the structure of the ink cartridge before filling with ink in an embodiment of the present invention; Figure 2100 is a schematic diagram of the structure of the ink cartridge after filling ink in an embodiment of the present invention; 100 includes a housing 101, the interior of the housing 101 has a liquid storage chamber 102 for accommodating ink 300, the liquid storage chamber 102 includes a first chamber 103 and a second chamber 104 connected at the bottom; a separator 105 is provided in the first chamber 103, the separator 105 separates the first chamber 103 into a first air pressure chamber 106 and a liquid storage chamber 107, the first air pressure chamber 106 and the liquid storage chamber 107 are separated by the separator The deformation or displacement of 105 in the first chamber 103 balances the pressure relationship between the first air pressure chamber 106 and the liquid storage chamber 107; the upper part of the second chamber 104 has a second air pressure chamber 108 for maintaining the liquid level in the second chamber 104; in addition, the housing 101 is provided with a first air port 109 communicating with the first air pressure chamber 106, and a liquid port 110 communicating with the liquid storage chamber 102; wherein the first air port 109 is located above the liquid level, and the liquid port 110 is located below the liquid level. Preferably, the volume of the first chamber 103 is greater than the volume of the second chamber 104.

[0035] like Figure 3 In this embodiment, the housing 101 can be assembled by splicing two parts, the upper housing 101a and the lower housing 101b, and the upper housing 101a and the lower housing 101b can be separated or combined as needed, wherein the detachable structure of the housing 101 is conducive to the assembly of some structures located in the housing 101, such as the isolation member 105. In other embodiments, the housing 101 can also adopt a left-right combination structure, or a symmetrical or asymmetrical combination structure, or a multi-part combination structure of two or more parts. In some embodiments, the detachable structure of the housing 101 can also be used for ink filling.

[0036] Preferably, in this embodiment, the shell 101 can be assembled by splicing two parts, wherein the joint is located in the middle and upper part of the shell 101. This structure makes the cavity of the lower shell larger and more convenient for storing ink, and the upper shell can be used as a cover for the lower shell.

[0037] like Figure 1-3 , the isolating member 105 in the embodiment of the present invention can be horizontally arranged in the first chamber 103, and the deformation / displacement direction of the isolating member 105 is the vertical direction; Figure 4 The isolating member 105 may also be vertically disposed in the first chamber 103, and the deformation / displacement direction of the isolating member 105 is horizontal. In addition, the isolating member 105 may also be disposed in the first chamber 103 in an oblique line at a certain angle to the horizontal or vertical direction.

[0038] The first air port 109 on the housing 101 is used to connect to the output end of the air control system, so that the air pressure of the first air pressure chamber 106 in the housing 101 is controlled by the air control system 200 .

[0039] The liquid port 110 on the housing 101 can be used as an ink outlet of the ink cartridge, and the ink 300 in the liquid storage chamber 102 can flow out through the liquid port 110; in some embodiments, the liquid port 110 can also be used as an ink inlet of the ink cartridge during ink filling, so as to achieve an ink filling operation from bottom to top, which is conducive to reducing the contact area between the ink and the gas in the ink cartridge. In the process of ink filling, the original gas in the ink cartridge can be discharged through the opening of the housing 101 or the opening structure on the housing 101.

[0040] Taking the ink 300 using liquid metal as an example, the liquid metal enters the bottom of the liquid storage chamber 102 from the liquid port 110. At this time, the liquid surface of the liquid metal entering the liquid storage chamber 102 will contact the original gas in the chamber 102 to form an extremely thin oxide film. The oxide film can prevent the liquid metal from further contacting the gas. Then, as the injection amount of liquid metal increases, the oxide film will rise with the rise of the liquid metal level without causing large shaking until the specified ink level is reached.

[0041] Preferably, the first air port 109 is disposed on the top surface of the housing 101, and the liquid port 110 is disposed on the bottom surface of the housing 101, so as to meet the requirements of raising the highest liquid level of the ink 300 during ink filling and discharging the ink 300 as completely as possible during ink discharge.

[0042] In some embodiments, the liquid port 110 can be directly connected to the print head 400 of the printer, or connected to the print head 400 of the printer through a pipeline. In some embodiments, the print head 400 can be a direct writing print head, a spraying print head, etc. Preferably, the print head 400 is a direct writing print head, which is composed of a pen tube and a pen tip.

[0043] like Figure 5 In some embodiments, the housing 101 is provided with a liquid injection port 111 connected to the liquid storage chamber 107 of the first chamber 103, and the liquid injection port 111 is located above the liquid level. The ink filling operation can be completed through the liquid injection port 111, and the gas in the chamber can also be discharged through the liquid injection port during the process.

[0044] In some embodiments, the housing 101 is provided with a second air port 112 communicating with the second air pressure chamber 108 of the second chamber 104. When the ink cartridge is filled with ink, the second chamber 104 can discharge the gas therein through the second air port 112, so that the ink in the second chamber 104 is flush with the ink in the first chamber 103.

[0045] The opening structures such as the gas port, liquid port, and liquid injection port on the housing described in the embodiments of the present invention can be opened and closed by the structure of the solenoid valve, or by traditional sealing methods (such as setting a sealing cover, a sealing cap, etc.). The opening and closing states of the above opening structures can be controlled according to actual needs to meet the needs of exhaust, sealing, liquid injection, and liquid discharge.

[0046] Reference Figure 6 In some embodiments, the isolating member 105 is an elastic oxygen-isolating member that fits the ink liquid surface; accordingly, the first chamber 103 has an assembly structure 113 for fixing the elastic oxygen-isolating member, and the edge of the elastic oxygen-isolating member is fixed on the assembly structure 113. Among them, the assembly structure 113 may include: a card slot structure opened in the inner wall of the first chamber 103, and an interference fit is formed between the edge of the isolating member 105 and the card slot to hold and fix. In some embodiments, the holding structure can also be reinforced by extrusion, plug-in insertion, etc. The assembly structure 113 may also include: a partition isolating certain areas in the liquid storage chamber 102 to prevent the deformation of the isolating member 105 from affecting the structure of the area (such as the liquid injection port 111). Specifically, the isolating member 105 can be made of a film made of an elastic non-breathable polymer material.

[0047] During the ink discharge process, the liquid level in the liquid storage chamber 107 in the first chamber 103 drops, resulting in an increase in the negative pressure in the liquid storage chamber 107. At this time, the isolation piece 105, due to its own good elastic properties, will deform downward in line with the liquid surface in the liquid storage chamber 107 under the trend of pressure, thereby balancing the pressure difference between the first air pressure chamber 106 and the liquid storage chamber 107.

[0048] like Figure 7 In some embodiments, the isolating member 105 is a piston body that fits the ink liquid surface, and the piston body forms a clearance fit with the inner wall of the first chamber. In this embodiment, the number of piston bodies is 1, corresponding to the shape of the cross section of the first chamber. In other embodiments, the isolating member 105 is one or more piston bodies that fit the ink liquid surface; a baffle structure 114 is provided in the middle of the first chamber 103, and the baffle structure 114 divides the middle of the first chamber 103 into partitions 115 corresponding to the number of piston bodies; the two ends of the partition 115 are open, respectively connected to the two ends of the first chamber 103 separated by the baffle structure 114; wherein, one or more piston bodies form a clearance fit with the inner wall of the corresponding partition. In this embodiment, a plurality of piston bodies can be used to form a displaceable structure in the first chamber 103, which can avoid the problem of rollover caused by offset when the ink is shaken compared to the use of a whole large piston body.

[0049] In some embodiments, the ink cartridge further includes: a limiting structure for limiting the displacement distance of the piston body in the corresponding partition 115. The limiting structure can be a needle-shaped, plate-shaped, or mesh-shaped limiting structure arranged at the openings at both ends of the partition 115 to block the piston body and allow liquid / gas to pass through. Preferably, the distance between any one of the openings at both ends of the partition 115 and the inner wall of the first chamber 103 adjacent to and opposite to it is less than the thickness of the piston body, and the end portions of the openings at both ends of the partition 115 constitute the limiting structure of the piston body.

[0050] like Figure 8-9 In some embodiments, the baffle structure 114 can form the partition 115 through its own structure, or can cooperate with the inner wall of the first chamber 103 to form the partition 115, or a structure in which both exist.

[0051] The ink cartridge provided by the present invention can maintain the basic stability of the ink level in the second chamber by utilizing the air pressure in the second air pressure chamber through the closed second air pressure chamber formed in the second chamber, thereby avoiding the problem of huge changes in the hydraulic pressure at the liquid outlet, which affects the ink output; on the other hand, by setting a deformable / displaceable isolation piece to separate the first air pressure chamber and the liquid storage chamber, the contact between the ink and the gas can be effectively prevented, thereby preventing the ink from deteriorating.

[0052] Based on the ink cartridge in the above embodiment, the present invention also proposes an ink cartridge control system, specifically, as follows: Fig.10 , Fig.10 The structure diagram of the ink cartridge control system in the embodiment of the present invention. The ink cartridge control system comprises: the ink cartridge 100 described in any one of the above items, as well as a pressure sensor 500 and an air control system 200; wherein the pressure sensor 500 is arranged in the liquid storage chamber 102 of the ink cartridge 100, and is used to detect the pressure value in the liquid storage chamber 102; the output end of the air control system 200 providing the control air pressure is connected to the first air port 109 of the ink cartridge 100, and is used to adjust the air pressure value in the liquid storage chamber 102 through the first air port 109; preferably, the pressure sensor 500, the air control system 200 and the preset pressure value together constitute the pressure closed-loop control of the ink cartridge.

[0053] The pressure sensor 500 may be a hydraulic pressure sensor, which is set at a fixed position below the ink level, and the preset pressure value is the hydraulic pressure value of the position verified by tests under the condition of good ink discharge; preferably, the pressure sensor 500 is set at the lowest ink level, such as on the liquid port. The pressure sensor 500 may also be an air pressure sensor, which may be set at a certain position of the first air pressure chamber 106 or the second air pressure chamber 108, and the preset pressure value is the air pressure value in the air pressure chamber verified by tests under the condition of good ink discharge; preferably, the air pressure sensor may be set on the second air port 112 on the second air pressure chamber 108, so as to form a closure for the second air pressure chamber 108 after the ink filling is completed.

[0054] The gas control system 200 can provide positive pressure, negative pressure, and pressure relief control to the first gas pressure chamber 106. The gas control system 200 includes: a gas pipeline 201; a negative pressure component 202, which is connected to the gas pipeline 201 through a first electromagnetic valve 203; a positive pressure component 204, which is connected to the gas pipeline 201 through a second electromagnetic valve 205; a pressure relief component 206, which is connected to the gas pipeline 201 through a third electromagnetic valve 207; one end of the gas pipeline 201 is used as an output end of the gas control system 200 to output the control gas pressure to the outside, and is connected to the first gas port 109 of the ink cartridge 100.

[0055] The negative pressure component 202 is used to output negative pressure, and a negative pressure air pump can be used; the positive pressure component 204 is used to output positive pressure, and a positive pressure air pump can be used; the pressure relief component is used to balance the air pressure in the air pressure chamber 108 with the external air pressure, and a throttling silencer valve can be used.

[0056] In some embodiments, the air control system 200 may further include a pressure stabilizing chamber 208 connected to the gas pipeline 201 to prevent air flow disturbances from occurring in the air pressure control system 200 and the ink cartridge 100 connected to the air pressure control system 200, thereby playing a buffering role.

[0057] like Fig.11 In the initial state, P2=P3+ρgh, P2 is the hydraulic pressure at the liquid port, P3 is the overall air pressure in the liquid storage chamber, ρ is the density of the ink, g is the acceleration of gravity, and h is the liquid level height in the second chamber. At this time, P3 is maintained at P0 by the air control system, and P0 is the preset air pressure value.

[0058] like Fig.12When the ink cartridge control system is working, as the ink is continuously consumed, the ink level in the liquid storage chamber gradually decreases. At this time, the negative pressure in the liquid storage chamber increases. This change will cause the isolation member to deform / displace downward to balance the pressure in the two chambers. Under the trend of pressure balance in the second chamber, the ink level in the second chamber will decrease slightly, thereby increasing the negative pressure of the second air pressure chamber at the upper part of the second chamber until the negative pressure of the first air pressure chamber and the second air pressure chamber are equal. At this time, the air pressure sensor located on the second air pressure chamber detects the current air pressure value and feeds it back to the air control system. The air control system adjusts the air pressure value in the chamber back to the preset air pressure value by means of pressure relief. At this time, the air pressure in the first air pressure chamber in the second chamber is restored, so that the ink level returns to the initial level. At this time, P2=P3+ρgh. Since P3 is adjusted back to P0, P3 remains unchanged, and h returns to its initial level without change. ρ and g are constant values, so the pressure of P2 at the liquid port remains constant.

[0059] Based on the above deduction, the ink outlet pressure at the pen tip of the print head is also maintained in a good state.

[0060] The present invention proposes an ink cartridge control system, which has the above-mentioned ink cartridge, so that the control system has the directional advantages of the ink cartridge, and through the closed-loop control of the cavity pressure formed by the pressure sensor, the air control system and the preset pressure value, the ink output of the ink cartridge can be accurately maintained in a constant state.

[0061] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

Claims

1. An ink cartridge, characterized in that: include: A shell, wherein the shell has a liquid storage chamber for accommodating ink; the liquid storage chamber includes a first chamber and a second chamber connected at the bottom; a partition is provided in the first chamber to separate the first chamber into a first air pressure chamber and a liquid storage chamber, and the pressures in the first air pressure chamber and the liquid storage chamber are balanced by deformation or displacement of the partition in the first chamber; the upper part of the second chamber has a closed second air pressure chamber for maintaining the liquid level in the second chamber; The shell is provided with a liquid injection port connected to the liquid storage cavity of the first chamber, and the liquid injection port is located above the liquid level; the shell is provided with a second air port connected to the second air pressure cavity of the second chamber; The second air port is used to discharge the gas in the second air pressure chamber when the ink cartridge is filled with ink, so that the ink in the second chamber is flush with the ink in the first chamber, and to connect the pressure sensor to seal the second air pressure chamber after the ink filling is completed; The shell is provided with a first air port communicating with the first air pressure chamber, and a liquid port communicating with the liquid storage chamber; wherein the first air port is located above the liquid level, and the liquid port is located below the liquid level.

2. The ink cartridge according to claim 1, characterized in that: The isolating member is an elastic oxygen-isolating member that fits the ink liquid surface; the first chamber is provided with an assembly structure for fixing the elastic oxygen-isolating member, and the edge of the elastic oxygen-isolating member is fixed on the assembly structure.

3. The ink cartridge according to claim 1, characterized in that: The isolating member is a piston body that fits the ink liquid surface; the piston body forms a clearance fit with the inner wall of the first chamber.

4. The ink cartridge according to claim 1 or 3, characterized in that: The isolation member is one or more piston bodies that are in contact with the ink liquid surface; A baffle structure is provided in the middle of the first chamber, and the baffle structure divides the middle of the first chamber into partitions corresponding to the number of the piston bodies; the two ends of the partition are open, and are respectively connected to the two ends of the first chamber separated by the baffle structure; wherein, a gap fit is formed between one or more of the piston bodies and the inner wall of the corresponding partition.

5. The ink cartridge according to claim 4, characterized in that: Also includes: A limiting structure for limiting the displacement distance of the piston body in the corresponding partition.

6. The ink cartridge according to claim 5, characterized in that: The distance between any one of the openings at both ends of the partition and the inner wall of the first chamber adjacent to and opposite to it is smaller than the thickness of the piston body, and the ends of the openings at both ends of the partition constitute the limiting structure of the piston body.

7. The ink cartridge according to claim 1, characterized in that: The liquid port on the shell is connected with a print head.

8. An ink cartridge control system, characterized in that: include: The ink cartridge as claimed in any one of claims 1 to 7, and the pressure sensor and the gas control system; The pressure sensor is located in the liquid storage chamber of the ink cartridge and is used to detect the pressure value in the liquid storage chamber; The output end of the air control system for providing controlled air pressure is connected to the first air port of the ink cartridge to adjust the air pressure value in the liquid storage chamber; The pressure sensor, the air control system and the preset pressure value together constitute the pressure closed-loop control of the ink cartridge.

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