NMP liquid supply system

Abstract

The utility model provides an NMP liquid supply system which comprises a total NMP liquid tank set, a first liquid supply pump set, a second liquid supply pump set, an automatic pressure relief control device, an NMP conveying buffer device, a first pipeline assembly, a second pipeline assembly, a third pipeline assembly, a fourth pipeline assembly, a fifth pipeline assembly and a sixth pipeline assembly. And the NMP transportation flow can be effectively adjusted according to the flow of the workshop while being used and sent. The quantitative filling flowmeter and the flow switch work cooperatively, liquid supply according to needs is achieved, and overload or insufficient liquid supply is avoided; a double-layer liquid supply pump set, namely a first pump set and a second pump set, is configured with multiple liquid tanks to form a redundant system, a standby unit can be automatically switched when a single point of failure occurs, and continuous liquid supply is guaranteed; the liquid seal assembly isolates air through nitrogen, and cooperates with a micromanometer and a pressure reducing valve to precisely regulate and control the air pressure in the tank, thereby preventing oxidative deterioration of the solvent; a breather valve with a flame arrester is arranged, so that the flame returning risk is doubly prevented, and the pressure balance in the tank is maintained.

Description

Technical Field

[0001] This utility model relates to the field of NMP supply technology, and more specifically, to an NMP supply system. Background Technology

[0002] NMP is widely used as an irreplaceable organic solvent in the lithium battery manufacturing industry and other industries. NMP, chemical name: N-methylpyrrolidone, also known as 1-methyl-2-pyrrolidone or N-methyl-2-pyrrolidone. NMP is a colorless, transparent, oily liquid with a slight amine odor. It has low volatility, excellent thermal and chemical stability, and can evaporate with water vapor. Its melting point is -24℃ and its boiling point is 202℃.

[0003] The closest existing NMP supply system to this application is authorized by publication number CN210511063U, which discloses an automatic pressure relief and alarm device for an NMP system. This device includes an NMP finished product tank, a liquid addition pump, and a waste liquid discharge pump. The NMP finished product tank is connected to a liquid addition pipe, an inlet pipe, and a waste liquid discharge pipe. The liquid addition pipe is connected to the inlet of the liquid addition pump, the outlet of the liquid addition pump is connected to the liquid addition discharge pipe, the waste liquid discharge pipe is connected to the inlet of the waste liquid discharge pump, and the outlet of the waste liquid discharge pump is connected to a waste liquid discharge pipe. A first pressure relief and alarm mechanism is installed on the liquid addition discharge pipe, and a second pressure relief and alarm mechanism is installed on the waste liquid discharge pipe.

[0004] The NMP finished product tank in this system is directly connected to the NMP liquid pipe at the user end via a pipeline. When the NMP liquid usage at the user end fluctuates, the system cannot effectively regulate the flow rate. It can only regulate the flow rate by switching the liquid addition pump and the liquid inlet pump on and off. This method cannot effectively regulate the flow rate, and frequent switching on and off will cause significant damage to the pump.

[0005] In view of this, the present invention proposes an NMP supply system that can effectively regulate flow rate and provide a buffer environment. Utility Model Content

[0006] This invention proposes an NMP supply system that can effectively regulate flow rate and provide a buffer environment.

[0007] An NMP supply system includes a main NMP tank assembly 1, a first supply pump assembly 2, a second supply pump assembly 3, an automatic pressure relief control device 4, an NMP delivery buffer device 5, a first piping assembly 6, a second piping assembly 7, a third piping assembly 8, a fourth piping assembly 9, a fifth piping assembly 10, and a sixth piping assembly 20. The system is characterized in that: an external NMP filling port is connected to the input end of the first supply pump assembly 2 via the first piping assembly 6; the output end of the first supply pump assembly 2 is connected to the input end of the main NMP tank assembly 1 via the second piping assembly 7; and the main NMP supply system... The output end of tank group 1 is connected to the input end of the second liquid supply pump group 3 through the third pipeline assembly 8. The output end of the second liquid supply pump group 3 is connected to the input end of the NMP delivery buffer device 5 through the fourth pipeline assembly 9. The NMP delivery buffer device provides buffer space for NMP and delivers it as needed according to the workshop flow rate. The output end of the NMP delivery buffer device 5 is connected to the workshop NMP usage area through the fifth pipeline assembly 10. The sixth pipeline assembly 20 is connected between the fourth pipeline assembly 9 and the second pipeline assembly 7. The sixth pipeline assembly 20 is equipped with an automatic pressure relief control device 4.

[0008] Furthermore, the NMP transport buffer device 5 includes an NMP transport buffer tank 51, a first flame arrester-type breather valve 52, and a first level gauge 53. The output end of the second liquid supply pump group 3 is connected to the input end of the NMP transport buffer tank 51 through a fourth pipeline assembly 9. The NMP transport buffer tank 51 is connected to the NMP usage area in the workshop through a fifth pipeline assembly 10. The first level gauge 53 is provided on the outside of the NMP transport buffer tank 51 for monitoring the liquid level inside the NMP transport buffer tank 51. The top of the NMP transport buffer tank 51 is provided with a first flame arrester-type breather valve 52, which is used to maintain the gas pressure balance of the tank, prevent the spread of flames, and reduce the volatilization of the medium. The bottom of the NMP transport buffer tank 51 is provided with a first drain outlet 54, which is connected to an external sewage sump through a pipeline.

[0009] In some embodiments, the total NMP liquid tank group 1 includes at least two total NMP liquid tanks 11. The bottom of the total NMP liquid tank 11 is provided with a second drain outlet 12, which is connected to an external drainage sump via a pipe. The top of each total NMP liquid tank 11 is provided with a second breather valve 13 with a flame arrester. The second breather valve 13 with a flame arrester is used to maintain the pressure balance of the storage tank, prevent the spread of flame, and reduce the volatilization of the medium. A second level gauge 14 is provided on the outside of the total NMP liquid tank 11 for monitoring the liquid level inside the total NMP liquid tank 11.

[0010] Furthermore, each total NMP liquid tank 11 is connected to a liquid seal assembly 30 at its top. One end of the liquid seal assembly 30 is connected to the nitrogen supply port in the workshop, and the other end of the liquid seal assembly 30 is connected to the top of each total NMP liquid tank 11. The liquid seal assembly 30 serves to deliver nitrogen into each total NMP liquid tank 11, prevent it from contacting air, and perform a liquid seal to prevent leakage, thereby ensuring the stability of the NMP solvent.

[0011] Furthermore, the liquid seal assembly 30 includes a first main inlet pipe 301 and a first branch inlet pipe 302. The workshop nitrogen supply port is connected to the first main inlet pipe 301. The first main inlet pipe 301 is connected to the top of each corresponding NMP liquid tank 11 through the first branch inlet pipe 302. Each first branch inlet pipe 302 is provided with a first ball valve 303, a first micro pressure gauge 304, a first pressure reducing valve 305, a second ball valve 307, and a second micro pressure gauge 306 from top to bottom. The first ball valve 303 and the second ball valve 307 are used to control the opening and closing of the pipeline. The first micro pressure gauge 304 and the second micro pressure gauge 306 are used to detect the pressure difference when the pipeline is inlet and outlet. The first pressure reducing valve 305 is used to reduce and regulate the pressure inside the pipeline.

[0012] Furthermore, a first bypass intake pipe 308 is also connected to the side of the first intake branch pipe 302. A third ball valve 309 is provided on the first bypass intake pipe 308. The third ball valve 309 serves to control the opening and closing of the bypass branch when the second intake branch pipe is faulty or under maintenance.

[0013] In some embodiments, the first liquid supply pump group 2 includes at least two first liquid supply pumps 21, the first pipeline assembly 6 includes at least two first liquid supply pipes 61, and the second pipeline assembly 7 includes at least two second liquid supply pipes 71. The external NMP filling port is connected to the input end of each first liquid supply pump 21 through the corresponding first liquid supply pipe 61, and the output end of each first liquid supply pump 21 is connected to the input end of each total NMP tank 11 through the corresponding second liquid supply pipe 71. The first liquid supply pipe 61 is provided with a fourth ball valve 611, a third micro pressure gauge 612, and a first Y-type valve from bottom to top. The filter 613, the fourth micro pressure gauge 614, the first flexible connection 615, and the second liquid supply pipe 71 are provided with the second flexible connection 711, the fifth micro pressure gauge 712, the first check valve 713, and the fifth ball valve 714 in sequence from bottom to top. The fourth ball valve 611 and the fifth ball valve 714 are used to control the opening and closing of the pipeline. The first Y-type filter 613 is used to filter impurities. The third micro pressure gauge 612, the fourth micro pressure gauge 614, and the fifth micro pressure gauge 712 are used to monitor the pipeline pressure. The first check valve 713 is used to prevent liquid backflow. The first flexible connection 615 and the second flexible connection 711 are used to reduce pump vibration.

[0014] In some embodiments, the second liquid supply pump group 3 includes at least two sets of second liquid supply pumps 31, the third pipeline assembly 8 includes at least two third liquid supply pipes 81, and the fourth pipeline assembly 9 includes at least two fourth liquid supply pipes 91. Each total NMP liquid tank 11 is connected to the input end of the second liquid supply pump 31 through a corresponding third liquid supply pipe 81, and the output end of the second liquid supply pump 31 is connected to the input end of the NMP delivery buffer device 5 through a corresponding fourth liquid supply pipe 91. The third liquid supply pipe 81 is provided with a sixth ball valve 811, a sixth micro pressure gauge 812, a second Y-type filter 813, a seventh micro pressure gauge 814, and a third flexible connector 81 from left to right. 5. The fourth liquid supply pipe 91 is provided with the following components from bottom to top: a fourth flexible connector 911, an eighth micro pressure gauge 912, a second check valve 913, a first flow switch 914, and a seventh ball valve 915. The sixth ball valve 811 and the seventh ball valve 915 are used to control the opening and closing of the pipe. The sixth micro pressure gauge 812, the seventh micro pressure gauge 814, and the eighth micro pressure gauge 912 are used to monitor the pipe pressure. The second Y-type filter 813 is used to filter impurities. The third flexible connector 815 and the fourth flexible connector 911 are used to reduce pump vibration. The second check valve 913 is used to prevent liquid backflow. The first flow switch 914 is used to adjust the pipe flow of each corresponding second liquid supply pump 31.

[0015] In some embodiments, the fourth pipeline assembly 9 is also provided with a quantitative injection flow meter 40 near the pressure sensor 101. The quantitative injection flow meter 40 is electrically connected to the first liquid supply pump group 2, the second liquid supply pump group 3, and the automatic pressure relief control device 4. The quantitative injection flow meter 40 measures the instantaneous flow rate and cumulative usage in the pipeline in real time to ensure that the liquid supply meets the process setting requirements. When the liquid supply reaches the preset value, the injection will automatically stop to avoid over- or under-injection.

[0016] In some embodiments, an electronic pressure gauge 72 is provided near the sixth pipe assembly 20 in the second pipe assembly 7, and a pressure sensor 101 is provided near the sixth pipe assembly 20 in the fifth pipe assembly 10. The electronic pressure gauge 72 and the pressure sensor 101 are electrically connected to the first liquid supply pump group 2, the second liquid supply pump group 3, and the automatic pressure relief control device 4. When the pressure of the second pipe assembly 7 or the pressure of the fifth pipe assembly 10 is too high, pressure relief and emergency control can be performed to stop the first liquid supply pump group 2 and the second liquid supply pump group 3 from working.

[0017] The beneficial effects of this utility model are as follows: This utility model proposes an NMP supply system, including a main NMP tank group 1, a first supply pump group 2, a second supply pump group 3, an automatic pressure relief control device 4, an NMP delivery buffer device 5, a first pipeline assembly 6, a second pipeline assembly 7, a third pipeline assembly 8, a fourth pipeline assembly 9, a fifth pipeline assembly 10, and a sixth pipeline assembly 20. By setting up the NMP delivery buffer device 5, a buffer space can be provided for NMP, and the NMP delivery flow can be effectively adjusted according to the workshop flow rate. The quantitative filling flow meter and flow switch work together to achieve on-demand liquid supply and avoid overload or insufficient liquid supply. The dual-stage supply pump group, namely the first and second pump groups, and the multi-tank configuration form a redundant system. In the event of a single point failure, the backup unit can be automatically switched to ensure continuous liquid supply. The liquid seal assembly isolates air with nitrogen and, together with a micro pressure gauge and a pressure reducing valve, accurately regulates the gas pressure inside the tank to prevent solvent oxidation and deterioration. Equipped with a breather valve with a flame arrester, it provides double protection against the risk of flame backlash and maintains the pressure balance inside the tank. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an NMP supply system according to this application.

[0019] Figure 2 This is a partially enlarged structural diagram of the main NMP liquid tank group of an NMP supply system according to this application.

[0020] Figure 3 This is a partially enlarged structural diagram of the first supply pump unit of an NMP supply system according to this application.

[0021] Figure 4 This is a partially enlarged structural diagram of the second supply pump group and automatic pressure relief control device of an NMP supply system according to this application.

[0022] Figure 5 This is a partially enlarged structural schematic diagram of the NMP delivery buffer device of an NMP supply system according to this application.

[0023] Explanation of key component symbols:

[0024] Main NMP liquid tank assembly 1, main NMP liquid tank 11, second drain outlet 12, second breather valve with flame arrester 13, second level gauge 14, first supply pump assembly 2, first supply pump 21, second supply pump assembly 3, second supply pump 31, automatic pressure relief control device 4, NMP delivery buffer device 5, NMP delivery buffer tank 51, first breather valve with flame arrester 52, first level gauge 53, first drain outlet 54, first piping assembly 6, first supply pipe 61, fourth ball valve 611, third micro pressure gauge 612, first Y-type filter 613, fourth micro pressure gauge 614, first flexible connection 615, second piping assembly 7, second supply pipe 71, second flexible connection 711, fifth micro pressure gauge 712, first check valve 713, fifth ball valve 714, electronic Pressure gauge 72, third pipeline assembly 8, third liquid supply pipe 81, sixth ball valve 811, sixth micro pressure gauge 812, second Y-type filter 813, seventh micro pressure gauge 814, third flexible connector 815, fourth pipeline assembly 9, fourth liquid supply pipe 91, fourth flexible connector 911, eighth micro pressure gauge 912, second check valve 913, first flow switch 914, seventh ball valve 915, fifth pipeline assembly 10, pressure sensor 101, sixth pipeline assembly 20, liquid seal assembly 30, first air inlet main pipe 301, first air inlet branch pipe 302, first ball valve 303, first micro pressure gauge 304, first pressure reducing valve 305, second micro pressure gauge 306, second ball valve 307, first bypass air inlet pipe 308, third ball valve 309, quantitative filling flow meter 40.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0026] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0027] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0028] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections. Example 1:

[0029] like Figure 1The diagram shown is a schematic representation of the overall structure of an NMP supply system according to this application; Figure 4 The diagram shown is a partially enlarged structural schematic of the second supply pump group and automatic pressure relief control device of an NMP supply system according to this application. The NMP supply system includes a main NMP tank group 1, a first supply pump group 2, a second supply pump group 3, an automatic pressure relief control device 4, an NMP delivery buffer device 5, a first pipeline assembly 6, a second pipeline assembly 7, a third pipeline assembly 8, a fourth pipeline assembly 9, a fifth pipeline assembly 10, and a sixth pipeline assembly 20. The system is characterized in that: the external NMP filling port is connected to the input end of the first supply pump group 2 through the first pipeline assembly 6, and the output end of the first supply pump group 2 is connected to the second pipeline assembly 6 through the second pipeline assembly 7. Component 7 is connected to the input end of the main NMP liquid tank group 1. The output end of the main NMP liquid tank group 1 is connected to the input end of the second liquid supply pump group 3 through the third pipeline assembly 8. The output end of the second liquid supply pump group 3 is connected to the input end of the NMP delivery buffer device 5 through the fourth pipeline assembly 9. The NMP delivery buffer device provides buffer space for NMP and delivers it as needed according to the workshop flow rate. The output end of the NMP delivery buffer device 5 is connected to the NMP usage area in the workshop through the fifth pipeline assembly 10. A sixth pipeline assembly 20 is connected between the fourth pipeline assembly 9 and the second pipeline assembly 7. An automatic pressure relief control device 4 is installed on the sixth pipeline assembly 20.

[0030] like Figure 5 The diagram shown is a partially enlarged structural schematic of an NMP delivery buffer device for an NMP supply system according to this application. The NMP delivery buffer device 5 includes an NMP delivery buffer tank 51, a first breather valve 52 with a flame arrester, and a first level gauge 53. The output end of the second supply pump group 3 is connected to the input end of the NMP delivery buffer tank 51 through a fourth pipeline assembly 9. The NMP delivery buffer tank 51 is connected to the NMP usage area in the workshop through a fifth pipeline assembly 10. The first level gauge 53 is provided on the outside of the NMP delivery buffer tank 51 for monitoring the liquid level inside the NMP delivery buffer tank 51. The top of the NMP delivery buffer tank 51 is provided with a first breather valve 52 with a flame arrester, which is used to maintain the pressure balance of the tank, prevent the spread of flame, and reduce the volatilization of the medium. The bottom of the NMP delivery buffer tank 51 is provided with a first drain outlet 54, which is connected to an external drainage sump through a pipeline.

[0031] like Figure 2The diagram shown is a partially enlarged structural schematic of a total NMP liquid tank group for an NMP supply system according to this application. The total NMP liquid tank group 1 includes at least two total NMP liquid tanks 11. The bottom of each total NMP liquid tank 11 is provided with a second drain outlet 12, which is connected to an external drainage sump via a pipe. The top of each total NMP liquid tank 11 is provided with a second breather valve 13 with a flame arrester. The second breather valve 13 with a flame arrester is used to maintain the pressure balance of the storage tank, prevent the spread of flame, and reduce the volatilization of the medium. A second level gauge 14 is provided on the outside of each total NMP liquid tank 11 for monitoring the liquid level inside the total NMP liquid tank 11.

[0032] Each total NMP liquid tank 11 is connected to a liquid seal assembly 30 at its top. One end of the liquid seal assembly 30 is connected to the nitrogen supply port in the workshop, and the other end of the liquid seal assembly 30 is connected to the top of each total NMP liquid tank 11. The liquid seal assembly 30 is used to deliver nitrogen into each total NMP liquid tank 11, prevent it from contacting air, and perform a liquid seal to prevent leakage, thus ensuring the stability of the NMP solvent.

[0033] The liquid seal assembly 30 includes a first main inlet pipe 301 and a first branch inlet pipe 302. The workshop nitrogen supply port is connected to the first main inlet pipe 301. The first main inlet pipe 301 is connected to the top of each corresponding NMP liquid tank 11 through the first branch inlet pipe 302. Each first branch inlet pipe 302 is provided with a first ball valve 303, a first micro pressure gauge 304, a first pressure reducing valve 305, a second ball valve 307, and a second micro pressure gauge 306 from top to bottom. The first ball valve 303 and the second ball valve 307 are used to control the opening and closing of the pipeline. The first micro pressure gauge 304 and the second micro pressure gauge 306 are used to detect the pressure difference when the pipeline is inlet and outlet. The first pressure reducing valve 305 is used to reduce and regulate the pressure inside the pipeline.

[0034] The first intake branch pipe 302 is also connected to a first bypass intake pipe 308. The first bypass intake pipe 308 is equipped with a third ball valve 309. The third ball valve 309 serves to control the opening and closing of the bypass branch when the second intake branch pipe is faulty or under maintenance.

[0035] like Figure 3The diagram shown is a partially enlarged structural schematic of the first supply pump group of an NMP supply system according to this application. The first supply pump group 2 includes at least two first supply pumps 21, the first pipeline assembly 6 includes at least two first supply pipes 61, and the second pipeline assembly 7 includes at least two second supply pipes 71. The external NMP filling port is connected to the input end of each first supply pump 21 through the corresponding first supply pipe 61, and the output end of each first supply pump 21 is connected to the input end of each main NMP tank 11 through the corresponding second supply pipe 71. The first supply pipe 61 is provided with a fourth ball valve 611 from bottom to top. The second supply pipe 71 is provided with the following components from bottom to top: a third micro pressure gauge 612, a first Y-type filter 613, a fourth micro pressure gauge 614, a first flexible connector 615, a second flexible connector 711, a fifth micro pressure gauge 712, a first check valve 713, and a fifth ball valve 714. The fourth ball valve 611 and the fifth ball valve 714 are used to control the opening and closing of the pipeline. The first Y-type filter 613 is used to filter impurities. The third micro pressure gauge 612, the fourth micro pressure gauge 614, and the fifth micro pressure gauge 712 are used to monitor the pipeline pressure. The first check valve 713 is used to prevent liquid backflow. The first flexible connector 615 and the second flexible connector 711 are used to reduce pump vibration.

[0036] like Figure 4 As shown, Figure 4 This is a partially enlarged structural diagram of the second supply pump group and automatic pressure relief control device of an NMP supply system according to this application. The second supply pump group 3 includes at least two second supply pumps 31, the third pipeline assembly 8 includes at least two third supply pipes 81, and the fourth pipeline assembly 9 includes at least two fourth supply pipes 91. Each total NMP tank 11 is connected to the input end of the second supply pump 31 through the corresponding third supply pipe 81, and the output end of the second supply pump 31 is connected to the input end of the NMP delivery buffer device 5 through the corresponding fourth supply pipe 91. The third supply pipe 81 is provided with a sixth ball valve 811, a sixth micro pressure gauge 812, and a second Y-type filter 813 from left to right. The fourth liquid supply pipe 91 is provided with the following components from bottom to top: a seventh micro pressure gauge 814, a third flexible connection 815, a fourth flexible connection 911, an eighth micro pressure gauge 912, a second check valve 913, a first flow switch 914, and a seventh ball valve 915. The sixth ball valve 811 and the seventh ball valve 915 are used to control the opening and closing of the pipeline. The sixth micro pressure gauge 812, the seventh micro pressure gauge 814, and the eighth micro pressure gauge 912 are used to monitor the pipeline pressure. The second Y-type filter 813 is used to filter impurities. The third flexible connection 815 and the fourth flexible connection 911 are used to reduce pump vibration. The second check valve 913 is used to prevent liquid backflow. The first flow switch 914 is used to adjust the pipeline flow of each corresponding second liquid supply pump 31.

[0037] The fourth pipeline assembly 9 is also equipped with a quantitative injection flow meter 40 near the pressure sensor 101. The quantitative injection flow meter 40 is electrically connected to the first liquid supply pump group 2, the second liquid supply pump group 3, and the automatic pressure relief control device 4. The quantitative injection flow meter 40 measures the instantaneous flow rate and cumulative usage in the pipeline in real time to ensure that the liquid supply meets the process setting requirements. When the liquid supply reaches the preset value, the injection will automatically stop to avoid over- or under-injection.

[0038] An electronic pressure gauge 72 is installed near the sixth pipe assembly 20 in the second pipe assembly 7, and a pressure sensor 101 is installed near the sixth pipe assembly 20 in the fifth pipe assembly 10. The electronic pressure gauge 72 and the pressure sensor 101 are electrically connected to the first liquid supply pump group 2, the second liquid supply pump group 3, and the automatic pressure relief control device 4. When the pressure of the second pipe assembly 7 or the pressure of the fifth pipe assembly 10 is too high, pressure relief and emergency control can be performed to stop the first liquid supply pump group 2 and the second liquid supply pump group 3 from working.

[0039] The beneficial effects of this utility model are as follows: This utility model proposes an NMP supply system, including a main NMP tank group 1, a first supply pump group 2, a second supply pump group 3, an automatic pressure relief control device 4, an NMP delivery buffer device 5, a first pipeline assembly 6, a second pipeline assembly 7, a third pipeline assembly 8, a fourth pipeline assembly 9, a fifth pipeline assembly 10, and a sixth pipeline assembly 20. By setting up the NMP delivery buffer device 5, a buffer space can be provided for NMP, and the NMP delivery flow can be effectively adjusted according to the workshop flow rate. The quantitative filling flow meter and flow switch work together to achieve on-demand liquid supply and avoid overload or insufficient liquid supply. The dual-stage supply pump group, namely the first and second pump groups, and the multi-tank configuration form a redundant system. In the event of a single point failure, the backup unit can be automatically switched to ensure continuous liquid supply. The liquid seal assembly isolates air with nitrogen and, together with a micro pressure gauge and a pressure reducing valve, accurately regulates the gas pressure inside the tank to prevent solvent oxidation and deterioration. Equipped with a breather valve with a flame arrester, it provides double protection against the risk of flame backlash and maintains the pressure balance inside the tank.

[0040] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.

Claims

1. An NMP liquid supply system, comprising a total NMP liquid tank group (1), a first liquid supply pump group (2), a second liquid supply pump group (3), an automatic pressure relief control device (4), an NMP delivery buffer device (5), a first pipe assembly (6), a second pipe assembly (7), a third pipe assembly (8), a fourth pipe assembly (9), a fifth pipe assembly (10), and a sixth pipe assembly (20), characterized in that: The external NMP filling port is connected to the input end of the first supply pump group (2) through the first pipe assembly (6). The output end of the first supply pump group (2) is connected to the input end of the total NMP tank group (1) through the second pipe assembly (7). The output end of the total NMP tank group (1) is connected to the input end of the second supply pump group (3) through the third pipe assembly (8). The output end of the second supply pump group (3) is connected to the input end of the NMP delivery buffer device (5) through the fourth pipe assembly (9). The NMP delivery buffer device provides buffer space for NMP and delivers it as needed according to the workshop flow rate. The output end of the NMP delivery buffer device (5) is connected to the workshop NMP usage area through the fifth pipe assembly (10). A sixth pipe assembly (20) is connected between the fourth pipe assembly (9) and the second pipe assembly (7). An automatic pressure relief control device (4) is provided on the sixth pipe assembly (20).

2. The NMP supply system of claim 1, wherein: The NMP transport buffer device (5) includes an NMP transport buffer tank (51), a first flame arrester-type breather valve (52), and a first level gauge (53). The output end of the second liquid supply pump group (3) is connected to the input end of the NMP transport buffer tank (51) through a fourth pipeline assembly (9). The NMP transport buffer tank (51) is connected to the NMP usage area in the workshop through a fifth pipeline assembly (10). The first level gauge (53) is provided on the outside of the NMP transport buffer tank (51) for monitoring the liquid level inside the NMP transport buffer tank (51). The top of the NMP transport buffer tank (51) is provided with a first flame arrester-type breather valve (52), which is used to maintain the gas pressure balance of the tank, prevent the spread of flames, and reduce the volatilization of the medium. The bottom of the NMP transport buffer tank (51) is provided with a first drain outlet (54), which is connected to an external sewage sump through a pipeline.

3. The NMP supply system of claim 1, wherein: The total NMP liquid tank group (1) includes at least two total NMP liquid tanks (11). The bottom of the total NMP liquid tank (11) is provided with a second drain outlet (12). The second drain outlet (12) is connected to an external drain sump through a pipe. The top of each total NMP liquid tank (11) is provided with a second breather valve (13) with a flame arrester. The second breather valve (13) with a flame arrester is used to maintain the gas pressure balance of the storage tank, prevent the spread of flame and reduce the volatilization of the medium. A second level gauge (14) is provided on the outside of the total NMP liquid tank (11) to monitor the liquid level inside the total NMP liquid tank (11).

4. The NMP supply system of claim 3, wherein: Each total NMP liquid tank (11) is connected to a liquid seal assembly (30) at the top. One end of the liquid seal assembly (30) is connected to the nitrogen supply port in the workshop, and the other end of the liquid seal assembly (30) is connected to the top of each total NMP liquid tank (11). The liquid seal assembly (30) is used to deliver nitrogen into each total NMP liquid tank (11), prevent it from contacting the air, and perform liquid sealing to prevent overflow, thus ensuring the stability of the NMP solvent.

5. The NMP supply system of claim 4, wherein: The liquid seal assembly (30) includes a first main inlet pipe (301) and a first branch inlet pipe (302). The workshop nitrogen supply port is connected to the first main inlet pipe (301). The first main inlet pipe (301) is connected to the top of each corresponding NMP liquid tank (11) through the first branch inlet pipe (302). Each first branch inlet pipe (302) is provided with a first ball valve (303), a first micro pressure gauge (304), a first pressure reducing valve (305), a second ball valve (307), and a second micro pressure gauge (306) from top to bottom. The first ball valve (303) and the second ball valve (307) are used to control the opening and closing of the pipeline. The first micro pressure gauge (304) and the second micro pressure gauge (306) are used to detect the pressure difference when the pipeline is inlet and outlet. The first pressure reducing valve (305) is used to reduce and regulate the pressure inside the pipeline.

6. The NMP supply system of claim 5, wherein: The first intake branch pipe (302) is also connected to a first bypass intake pipe (308) on its side. The first bypass intake pipe (308) is equipped with a third ball valve (309). The third ball valve (309) serves as a bypass branch to control the opening and closing of the branch when the second intake branch pipe is faulty or under maintenance.

7. The NMP supply system of claim 1, wherein: The first liquid supply pump group (2) includes at least two sets of first liquid supply pumps (21), the first pipeline assembly (6) includes at least two first liquid supply pipes (61), the second pipeline assembly (7) includes at least two second liquid supply pipes (71), the external NMP filling port is connected to the input end of each first liquid supply pump (21) through the corresponding first liquid supply pipe (61), and the output end of each first liquid supply pump (21) is connected to the input end of each total NMP tank (11) through the corresponding second liquid supply pipe (71). The first liquid supply pipe (61) is provided with a fourth ball valve (611), a third micro pressure gauge (612), and a first Y-type filter (613) from bottom to top. The fourth micro pressure gauge (614), the first flexible connector (615), and the second liquid supply pipe (71) are provided with the second flexible connector (711), the fifth micro pressure gauge (712), the first check valve (713), and the fifth ball valve (714) from bottom to top. The fourth ball valve (611) and the fifth ball valve (714) are used to control the opening and closing of the pipeline. The first Y-type filter (613) is used to filter impurities. The third micro pressure gauge (612), the fourth micro pressure gauge (614), and the fifth micro pressure gauge (712) are used to monitor the pipeline pressure. The first check valve (713) is used to prevent liquid backflow. The first flexible connector (615) and the second flexible connector (711) are used to reduce pump vibration.

8. The NMP supply system of claim 1, wherein: The second liquid supply pump group (3) includes at least two sets of second liquid supply pumps (31), the third pipeline assembly (8) includes at least two third liquid supply pipes (81), and the fourth pipeline assembly (9) includes at least two fourth liquid supply pipes (91). Each total NMP tank (11) is connected to the input end of the second liquid supply pump (31) through the corresponding third liquid supply pipe (81), and the output end of the second liquid supply pump (31) is connected to the input end of the NMP delivery buffer device (5) through the corresponding fourth liquid supply pipe (91). The third liquid supply pipe (81) is provided with a sixth ball valve (811), a sixth micro pressure gauge (812), a second Y-type filter (813), a seventh micro pressure gauge (814), and a third flexible connector (815) from left to right. The fourth liquid supply pipe (91) is provided with the following components from bottom to top: a fourth flexible connector (911), an eighth micro pressure gauge (912), a second check valve (913), a first flow switch (914), and a seventh ball valve (915). The sixth ball valve (811) and the seventh ball valve (915) are used to control the opening and closing of the pipeline. The sixth micro pressure gauge (812), the seventh micro pressure gauge (814), and the eighth micro pressure gauge (912) are used to monitor the pipeline pressure. The second Y-type filter (813) is used to filter impurities. The third flexible connector (815) and the fourth flexible connector (911) are used to reduce pump vibration. The second check valve (913) is used to prevent liquid backflow. The first flow switch (914) is used to adjust the pipeline flow of each corresponding second liquid supply pump (31).

9. The NMP supply system of claim 1, wherein: The fourth pipeline assembly (9) is also equipped with a quantitative injection flow meter (40) near the pressure sensor (101). The quantitative injection flow meter (40) is electrically connected to the first liquid supply pump group (2), the second liquid supply pump group (3), and the automatic pressure relief control device (4). The quantitative injection flow meter (40) measures the instantaneous flow rate and cumulative usage in the pipeline in real time to ensure that the liquid supply meets the process setting requirements. When the liquid supply reaches the preset value, the injection will automatically stop to avoid over- or under-injection.

10. The NMP supply system of claim 1, wherein: An electronic pressure gauge (72) is installed near the sixth pipe assembly (20) in the second pipe assembly (7), and a pressure sensor (101) is installed near the sixth pipe assembly (20) in the fifth pipe assembly (10). The electronic pressure gauge (72), the pressure sensor (101) are electrically connected to the first liquid supply pump group (2), the second liquid supply pump group (3), and the automatic pressure relief control device (4). When the pressure of the second pipe assembly (7) is too high or the pressure of the fifth pipe assembly (10) is too high, pressure relief and emergency control can be performed to stop the first liquid supply pump group (2) and the second liquid supply pump group (3) from working.

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