Sensor mounting structure for online detection of NMP moisture and tank system

Abstract

The utility model discloses a kind of online detection NMP moisture sensor mounting structure and storage tank system, including the pipe joint of being set on discharge pipe, first flange is fixedly connected on pipe joint, the detection end of moisture sensor is inserted into pipe joint, moisture sensor is installed on first flange, first valve is installed in the upstream end of pipe joint in discharge pipe, second valve is installed in the downstream end of pipe joint in discharge pipe, air inlet is set between first valve and second valve on discharge pipe, third valve is installed on air inlet.The sensor mounting structure of the utility model can prevent air from entering into discharge pipe from pipe joint when moisture sensor is disassembled and checked.

Description

Technical Field

[0001] This utility model relates to the field of NMP storage tank technology, and in particular to a sensor installation structure and storage tank system for online detection of NMP moisture. Background Technology

[0002] NMP (N-methylpyrrolidone), as an important polar solvent, is widely used in lithium batteries, semiconductors, chemical synthesis, and other fields. Its moisture content directly affects product quality. For example, according to SEMI standards, the moisture content of high-end wet electronic chemicals needs to be controlled within the range of 0.01%-0.05%, and some semiconductor-grade reagents even require ppm-level precision.

[0003] Existing NMP moisture detection methods include offline detection and online detection. Offline detection, such as the Karl Fischer method, requires sampling and analysis, which results in detection lag and cannot reflect changes in NMP moisture during the process in real time. Figure 1 The online monitoring solution currently used by our company involves a discharge pipe 13 installed at the discharge port 11 at the lower end of the storage tank body 10. A moisture sensor 20 is installed on the discharge pipe 13. When NMP passes through the discharge pipe 13, the moisture content of the NMP can be detected in real time by the moisture sensor 20. However, its drawback is that because the moisture content in NMP is low, the moisture sensor 20 needs to measure very accurately. Therefore, after a certain period of use, the moisture sensor 20 needs to be disassembled for calibration. However, in the current structure, if the moisture sensor 20 is directly removed from the first flange 15 of the discharge pipe 13, air will enter the discharge pipe 13 through the pipe interface 14. This results in a large amount of air remaining in the discharge pipe 13 when the moisture sensor 20 is calibrated and reinstalled. During production, when NMP enters the discharge pipe 13, impurities and moisture from the air will also enter the NMP, affecting its quality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sensor installation structure and storage tank system for online detection of NMP moisture, so as to prevent air from entering the discharge pipe after the moisture sensor is removed.

[0005] To achieve the above objectives, this application provides a sensor mounting structure for online detection of NMP moisture, including a pipe interface disposed on a discharge pipe, a first flange fixedly connected to the pipe interface, a detection end of a moisture sensor passing through the pipe interface, the moisture sensor being mounted on the first flange, a first valve installed at the upstream end of the discharge pipe located at the pipe interface, a second valve installed at the downstream end of the discharge pipe located at the pipe interface, an air inlet provided on the discharge pipe between the first and second valves, and a third valve installed on the air inlet.

[0006] The third valve is a three-way valve, with one port connected to the air inlet, another port used to inject inert gas, and the third port used to exhaust gas.

[0007] It also includes a sealing cap, which is used to install onto the first flange after the moisture sensor is removed.

[0008] The sealing cap is installed and connected to the first flange by bolts.

[0009] The sealing cap is installed and connected to the first flange via a clamp.

[0010] The sealing cap is provided with an exhaust pipe, and the sealing cap has a hole that communicates with the exhaust pipe. A fourth valve is installed on the exhaust pipe.

[0011] A storage tank system includes a storage tank body, with a discharge port located on the lower side of the storage tank body. The discharge port is equipped with a sensor mounting structure for online detection of NMP moisture.

[0012] The first valve is installed and connected to the discharge port, and the discharge pipe is connected to the first valve. The discharge pipe is connected to the discharge port, and the first valve is installed on the discharge pipe.

[0013] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. The first and second valves of this utility model are used to divide an independent space in the discharge pipe, and the air inlet is used to inject inert gas, such as nitrogen, into the independent space. When the moisture sensor needs to be removed for calibration, first close the first valve to discharge the NMP in the discharge pipe, then close the second valve, connect the inert gas cylinder to the air inlet through a pipe, open the third valve, and the inert gas enters the independent space of the first and second valves, creating positive pressure in the independent space. Then, remove the connecting bolts between the moisture sensor and the first flange, and then pull out the moisture sensor, as shown in the figure. Because the independent space is under positive pressure, the inert gas is discharged from the pipe interface, thereby preventing air from entering the discharge pipe from the pipe interface.

[0014] 2. This embodiment also includes a sealing cap, which is used to install onto the first flange after the moisture sensor is removed. After the sealing cap is installed, the third regulating valve can be rotated to seal and close the air inlet, reducing the consumption of inert gas.

[0015] 3. The sealing cap of this utility model is provided with an exhaust pipe and a hole that communicates with the exhaust pipe. A fourth valve is installed on the exhaust pipe. When installing the sealing cap, the fourth valve is opened to release pressure, which facilitates the installation of the sealing cap. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 For existing sensor mounting structures.

[0018] Figure 2 This is a schematic diagram of the sensor mounting structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the installation of the sealing cap after disassembling the moisture sensor in the sensor mounting structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the sealing cap installed on the first flange in this utility model.

[0021] Figure 5 This is an exploded view of the sealing cap installed on the first flange in this utility model.

[0022] Figure 6 This is a schematic diagram of the third valve for venting in this utility model.

[0023] Figure 7 This is a schematic diagram of the third valve injecting air in this utility model.

[0024] Figure 8 This is a schematic diagram of the third valve in the closed state in this utility model.

[0025] Figure 9 This is a schematic diagram of the sealing cap being installed using a clamp in this utility model.

[0026] Figure 10 This is a schematic diagram of the fourth valve installed on the sealing cap of this utility model.

[0027] Figure Labels The storage tank body 10, the discharge port 11, the first valve 12, the discharge pipe 13, the pipe interface 14, the first flange 15, the second valve 16, the air inlet 17, and the third valve 18. Moisture sensor 20, sealing cap 30, exhaust pipe 31, fourth valve 32, clamp 40. Detailed Implementation

[0028] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be noted that the specific embodiments described below are only used to explain the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0029] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0030] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0031] Example 1: See Figure 2 , 3 This embodiment provides a sensor mounting structure for online detection of NMP moisture, including a pipe interface 14 disposed on a discharge pipe 13, a first flange 15 fixedly connected to the pipe interface 14, the detection end of a moisture sensor 20 passing through the pipe interface 14, the moisture sensor 20 being mounted on the first flange 15, a first valve 12 installed at the upstream end of the discharge pipe 13 located at the pipe interface 14, a second valve 16 installed at the downstream end of the discharge pipe 13 located at the pipe interface 14, an air inlet 17 disposed on the discharge pipe 13 between the first valve 12 and the second valve 16, and a third valve 18 installed on the air inlet 17.

[0032] The first valve 12 and the second valve 16 are used to divide an independent space on the discharge pipe 13, and the inlet 17 is used to inject an inert gas, such as nitrogen, into the independent space. When the moisture sensor 20 needs to be removed for calibration, first close the first valve 12 to discharge the NMP in the discharge pipe 13, then close the second valve 16, connect the inert gas cylinder to the inlet 17 through a pipe, open the third valve 18, and the inert gas enters the independent space between the first valve 12 and the second valve 16, creating positive pressure in the independent space. Then, remove the bolts connecting the moisture sensor 20 to the first flange 15, and then pull out the moisture sensor 20. Figure 3 As shown, since the independent space is under positive pressure, the inert gas is discharged from the pipe interface 14, thereby preventing air from entering the discharge pipe 13 from the pipe interface 14.

[0033] Moisture sensor 20 uses a microwave radar moisture sensor.

[0034] To prevent air from entering the discharge pipe 13 from the inert gas cylinder pipeline, the third valve 18 is a three-way valve. One port of the three-way valve is connected to the air inlet 17, another port is used to inject inert gas, and the third port is used to exhaust gas.

[0035] See Figure 6 After connecting the gas cylinder pipeline to the third valve 18, first adjust the third valve 18 to... Figure 6 As shown in the diagram, air in the gas cylinder pipeline is being released from the third port. Then, adjust the third valve 18 as follows... Figure 7 As shown, inert gas is injected into the discharge pipe 13 at this time.

[0036] Example 2: Based on Example 1, after removing the moisture sensor 20, the pipe interface 14 remains open, and inert gas will continuously be discharged. To reduce the consumption of inert gas, see [reference needed]. Figure 4 This embodiment also includes a sealing cap 30, which is used to install onto the first flange 15 after the moisture sensor 20 is removed.

[0037] In this embodiment, the sealing cap 30 is a blind flange. The sealing cap 30 is bolted to the first flange 15. A sealing ring is installed between the sealing cap 30 and the first flange 15 for sealing.

[0038] After installing the sealing cap 30, see Figure 8 Then, the third regulating valve 18 can be rotated to block and close the air inlet 17, reducing the consumption of inert gas.

[0039] In another option, see Figure 4 , 5 9. The sealing cap 30 is installed and connected to the first flange 15 via a clamp 40. The clamp 40 is existing technology, such as a quick-connect clamp.

[0040] Example 3: Based on Example 2, for ease of installation of the sealing cap 30, see [link to example]. Figure 4 , 5 9. 10. The sealing cap 30 is provided with an exhaust pipe 31, and the sealing cap 30 has a hole that communicates with the exhaust pipe 31. A fourth valve 32 is installed on the exhaust pipe 31. When installing the sealing cap 30, the fourth valve 32 is opened to release pressure, which facilitates the installation of the sealing cap 30. After the sealing cap 30 is installed, the fourth valve 32 and the third valve 18 are closed.

[0041] Example 4: Based on Example 1, Example 2, or Example 3, see [link to example]. Figure 2 , 3 A storage tank system includes a storage tank body 10, a discharge port 11 is provided on the lower side of the storage tank body 10, and a sensor mounting structure for online detection of NMP moisture is installed at the discharge port 11.

[0042] In one embodiment, the discharge port 11 is fitted with a flange, the first valve 12 is connected to the flange of the discharge port 11, and the discharge pipe 13 is connected to the first valve 12 via a flange structure.

[0043] In another embodiment, the discharge pipe 13 is connected to the discharge port 11, and the first valve 12 is installed on the discharge pipe 13 via a flange structure.

[0044] The working principle or process of this utility model: See Figure 2 When the moisture sensor 20 needs to be removed for calibration, first close the first valve 12 to discharge the NMP in the discharge pipe 13, and then close the second valve 16.

[0045] Connect the inert gas cylinder to the inlet 17 via a pipe, open the third valve 18, and the inert gas enters the independent space between the first valve 12 and the second valve 16, creating a certain positive pressure in the independent space. Then, remove the connecting bolts between the moisture sensor 20 and the first flange 15, and then pull out the moisture sensor 20. Figure 3 As shown.

[0046] Because the independent space is under positive pressure, the inert gas is discharged from the pipe interface 14, thereby preventing air from entering the discharge pipe 13 from the pipe interface 14.

[0047] Then, the sealing cap 30 is installed on the first flange 15, and the fourth valve 32 and the third valve 18 are closed.

[0048] After the moisture sensor 20 is calibrated, open the third valve 18, then open the fourth valve 32, then open the clamp 40 and remove the sealing cap 30, and then reinstall the moisture sensor 20.

[0049] After reloading, close the third valve 18 and remove the inert gas cylinder and pipeline.

[0050] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A sensor mounting structure for online detection of moisture in NMP, comprising a pipe interface (14) disposed on a discharge pipe (13), a first flange (15) fixedly connected to the pipe interface (14), the detection end of a moisture sensor (20) passing through the pipe interface (14), and the moisture sensor (20) mounted on the first flange (15), characterized in that: The discharge pipe (13) is equipped with a first valve (12) at the upstream end of the pipe interface (14), and a second valve (16) is installed at the downstream end of the discharge pipe (13). An air inlet (17) is provided on the discharge pipe (13) between the first valve (12) and the second valve (16), and a third valve (18) is installed on the air inlet (17).

2. The sensor mounting structure for online detection of NMP moisture according to claim 1, characterized in that: The third valve (18) is a three-way valve. One port of the three-way valve is connected to the air inlet (17), the other port is used to inject inert gas, and the third port is used to exhaust gas.

3. The sensor mounting structure for online detection of NMP moisture according to claim 1, characterized in that: It also includes a sealing cap (30) for mounting onto the first flange (15) after the moisture sensor (20) has been removed.

4. The sensor mounting structure for online detection of NMP moisture according to claim 3, characterized in that: The sealing cap (30) is installed and connected to the first flange (15) by bolts.

5. The sensor mounting structure for online detection of NMP moisture according to claim 3, characterized in that: The sealing cap (30) is installed and connected to the first flange (15) by a clamp (40).

6. A sensor mounting structure for online detection of NMP moisture according to claim 3, 4, or 5, characterized in that: The sealing cap (30) is provided with an exhaust pipe (31), and the sealing cap (30) is provided with a hole that communicates with the exhaust pipe (31). A fourth valve (32) is installed on the exhaust pipe (31).

7. A storage tank system, comprising a storage tank body (10), wherein a discharge port (11) is provided on the lower side of the storage tank body (10), characterized in that: The discharge port (11) is equipped with a sensor mounting structure for online detection of NMP moisture as described in claim 1.

8. A storage tank system according to claim 7, characterized in that: The first valve (12) is installed and connected to the discharge port (11), and the discharge pipe (13) is connected to the first valve (12).

9. A storage tank system according to claim 7, characterized in that: The discharge pipe (13) is connected to the discharge port (11), and the first valve (12) is installed on the discharge pipe (13).

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