Diaphragm bubble point pressure testing device and testing method

Abstract

The invention provides a diaphragm bubble point pressure testing device and a testing method. The diaphragm bubble point pressure testing device and the testing method are used for solving the technical problems that an existing diaphragm bubble point pressure testing device is complex in structure, at least two persons need to be matched for operation during testing, and air tightness is attenuated due to the fact that a drainage hole is independently formed or the resetting process is long due to the fact that drainage is detached. According to the diaphragm bubble point pressure testing device, an air cavity is arranged to be of a barrel-shaped structure with the bottom being a spherical surface, a liquid cavity is arranged to be of a hollow columnar structure with the upper portion and the lower portion being open, and a diaphragm to be tested is clamped between the air cavity and the liquid cavity in a sealed mode; the position of the air inlet nozzle is specially designed, so that the uniformity of an air pressure field in the air cavity can be ensured, and the residual liquid can be discharged through the air inlet nozzle when the air cavity is inclined by a certain angle by ingeniously combining with the rotating air cavity, so that the arrangement of an independent drainage hole is effectively avoided, and the air tightness of the testing device is ensured; and the whole testing device does not need to be disassembled, and the drainage time is reduced to several seconds from half an hour after the device is reset.

Description

Technical Field

[0001] The invention relates to a diaphragm of an electrolytic cell, and in particular to a diaphragm bubble point pressure testing device and a testing method. Background Art

[0002] As a new, pollution-free, green energy source, hydrogen's industrial chain has seen rapid development. Hydrogen production through water electrolysis is a hot topic in the hydrogen production field due to its high-value oxygen byproduct, stable and reliable process, and zero pollution. A porous membrane, a crucial component of the electrolyzer, provides both ion channels and isolation from hydrogen and oxygen. The pore size and porosity distribution play a decisive role in the membrane's performance. The bubble point method can be used to measure the critical pressure at which gas permeates the membrane to generate the first bubble and guide continuous bubbling, thereby calculating the membrane's maximum pore size and providing guidance for membrane R&D and iteration. Existing diaphragm bubble point pressure testing devices are often complex, requiring at least two people to operate. Furthermore, to ensure the dryness of the test device, residual liquid within the device must be drained after the test. Currently, two methods are commonly used to achieve this: One is to provide separate drain holes, but excessive pores can compromise the device's airtightness. The other is to disassemble the device and drain the residual liquid through the water inlet. However, this method requires a lengthy disassembly and reassembly process, typically taking about half an hour. Therefore, it is of great significance to design a diaphragm bubble point pressure testing device with simple structure and easy operation. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical problems that the existing diaphragm bubble point pressure testing device has a complex structure, requires at least two people to cooperate in the test, and causes the air tightness to be attenuated due to the separate setting of drainage holes or the long reset process caused by disassembly and drainage, and to provide a diaphragm bubble point pressure testing device and testing method with a simple structure and easy operation.

[0004] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0005] A diaphragm bubble point pressure testing device is special in that it includes a support seat, an air cavity, a liquid cavity, a pressurized air source, an exhaust pipe and a locking screw;

[0006] The support base includes a fixed base and two support columns, and the two support columns are vertically fixed on both sides of the fixed base;

[0007] The air cavity is a barrel-shaped structure with a spherical bottom, and its two opposite side walls are rotatably connected to two support columns, and a first sealing flange is provided at the upper end of the air cavity;

[0008] The liquid chamber is a hollow cylindrical structure with upper and lower openings, and a second sealing flange adapted to the first sealing flange is provided at its lower end; the first sealing flange and the second sealing flange are fixedly connected, and the diaphragm to be tested is circumferentially sealed and clamped between the first and second sealing flanges; the upper end of the liquid chamber is used for injecting a transparent liquid;

[0009] An air inlet nozzle is radially provided at the transition position between the spherical surface at the bottom of the air cavity and the cylindrical surface of the side wall, and the straight-line distance between the air inlet nozzle and the corresponding positions of the two support columns is equal; the outer end of the air inlet nozzle is used to connect to the pressurized air source to introduce pressurized gas into the air cavity when the air cavity is pressurized, and is used to discharge the remaining liquid in the air cavity after the test is completed; an exhaust nozzle is radially provided near the top of the side wall of the air cavity, and the outer end of the exhaust nozzle is connected to the exhaust pipe; the exhaust pipe is provided with a pressure gauge and a stop valve in sequence from the inside to the outside;

[0010] A threaded hole is provided on the support column at a position corresponding to the outer wall of the air cavity, and one end of the locking screw is used to pass through the threaded hole and abut against the outer wall of the air cavity.

[0011] Furthermore, a visual unit is included;

[0012] The visual unit is located above the liquid cavity and is used to synchronously photograph the upper surface state of the diaphragm to be measured and the pressure gauge value.

[0013] Furthermore, two sealing gaskets are included;

[0014] One sealing gasket is arranged between the first sealing flange and the diaphragm to be tested, and the other sealing gasket is arranged between the diaphragm to be tested and the second sealing flange, so as to realize the circumferential sealing installation of the diaphragm to be tested.

[0015] Furthermore, two cylindrical protrusions are symmetrically provided on the outer wall of the air cavity, and U-shaped grooves adapted to the cylindrical protrusions are respectively opened on the two support columns. The two cylindrical protrusions are respectively installed in the two U-shaped grooves to enable the air cavity to rotate relative to the support columns.

[0016] Furthermore, the fixed base includes two oppositely arranged rectangular bottom plates, and a plurality of connecting rods laterally connected between the two rectangular bottom plates;

[0017] The length directions of the two rectangular bottom plates are both perpendicular to the rotation axis of the air cavity.

[0018] Furthermore, it also includes a plurality of fastening screws and two positioning guide pillars;

[0019] The first sealing flange is provided with a plurality of first threaded holes on the circumference thereof, and the second sealing flange is provided with a plurality of mounting holes at corresponding positions thereof, and a plurality of fastening screws are respectively passed through the corresponding mounting holes and threadedly connected to the first threaded holes;

[0020] Two first positioning holes are provided on the first sealing flange, and the two first positioning holes are symmetrically arranged about the center. Two second positioning holes are provided at corresponding positions on the second sealing flange, and two positioning guide pillars pass through the corresponding first positioning holes and second positioning holes respectively to achieve alignment and positioning.

[0021] Furthermore, a plurality of weight-reducing holes of different sizes are symmetrically provided on the two support columns.

[0022] Furthermore, the pressurized gas source is an inert gas or compressed air.

[0023] In addition, the present invention also provides a diaphragm bubble point pressure testing method, which is special in that it includes the following steps:

[0024] Step 1: Build the above-mentioned diaphragm bubble point pressure testing device;

[0025] Step 2: Install the diaphragm to be tested circumferentially sealably between the first sealing flange and the second sealing flange;

[0026] Step 3: Close the stop valve and slowly inject a transparent liquid into the liquid cavity to fully soak the diaphragm to be tested. At this time, the diaphragm to be tested and the interior of the air cavity form a closed space;

[0027] Step 4: connect an external pressurized air source to the air inlet nozzle and slowly increase the pressure into the enclosed space of the air cavity through the air inlet nozzle;

[0028] Step 5: Observe the upper surface of the diaphragm to be tested through the inner cavity of the liquid chamber. When the first bubble is generated at the contact interface between the diaphragm to be tested and the transparent liquid, stop pressurizing and read the value of the pressure gauge to obtain the bubble point pressure value of the diaphragm to be tested.

[0029] Furthermore, in step 3, the transparent liquid is water.

[0030] The beneficial effects of the present invention compared to the prior art are as follows:

[0031] 1. The present invention provides a diaphragm bubble point pressure testing device, in which an air chamber is configured as a barrel-shaped structure with a spherical bottom, and a liquid chamber is configured as a hollow cylindrical structure with upper and lower openings. A diaphragm to be tested is sealed and clamped between the air chamber and the liquid chamber, and the pressure is slowly increased in the enclosed space of the air chamber. The pressure gauge value when the first bubble is generated at the contact interface between the diaphragm to be tested and the transparent liquid during the test is observed and read. The observation is convenient and the structure is simple. The present invention has a special design for the setting position of the air inlet nozzle. On the one hand, the air inlet nozzle is arranged at the transition position between the spherical surface at the bottom of the air chamber and the cylindrical surface of the side wall to ensure a uniform gas pressure field in the air chamber. On the other hand, the air chamber is cleverly rotatably arranged on a support seat. In conjunction with the position of the air inlet nozzle, the air chamber can be rotated and tilted at a certain angle to smoothly discharge the remaining liquid through the air inlet nozzle. The setting of a separate drainage hole is effectively avoided, and the air tightness of the testing device is ensured. Without disassembling the entire testing device, the drainage time is reduced from half an hour to a few seconds when the device is reset. The device can be widely used for testing the bubble point pressure of various diaphragms.

[0032] 2. The present invention provides a diaphragm bubble point pressure testing device, in which a pressure gauge is set on the exhaust pipe and the internal cavity of the liquid chamber is used as a test observation window. The first bubble generated at the contact interface between the diaphragm to be tested and the water and the corresponding pressure gauge value can be observed at the same time. The operation and reading are convenient, and one person can complete the diaphragm bubble point pressure test process.

[0033] 3. The present invention provides a diaphragm bubble point pressure testing device, which uses a visual unit to synchronously capture the surface state of the diaphragm to be tested and the pressure gauge value, greatly improving the accuracy and testing efficiency of the diaphragm bubble point pressure test.

[0034] 4. The present invention provides a diaphragm bubble point pressure testing device, in which multiple weight-reducing holes of different sizes are symmetrically opened on two support columns. Combined with the setting of the fixed base, the weight of the entire testing device is greatly reduced, and the portability of the diaphragm bubble point pressure testing device is improved. In addition, the weight-reducing holes reduce the weight and provide a gripping point for carrying the testing device.

[0035] 5. The present invention provides a method for testing the diaphragm bubble point pressure, which is simple to operate, convenient to test and highly practical, and can quickly and accurately obtain the diaphragm bubble point pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of an embodiment of a diaphragm bubble point pressure testing device of the present invention;

[0037] Figure 2 It is a three-dimensional schematic diagram of an embodiment of a diaphragm bubble point pressure testing device of the present invention.

[0038] The specific drawings are as follows:

[0039] 1-Liquid chamber; 2-Sealing gasket; 3-Fasten screw; 4-Cylindrical protrusion; 5-Air chamber; 6-Support seat, 61-Fixed base, 611-Rectangular base plate, 612-Connecting rod, 62-Support column; 7-Locking screw; 8-Exhaust pipe; 9-Exhaust nozzle; 10-Positioning guide column; 11-Inlet nozzle; 12-Pressure gauge; 13-Stop valve. DETAILED DESCRIPTION

[0040] In order to make the advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1 、 Figure 2 As shown, a diaphragm bubble point pressure testing device includes a support seat 6, an air cavity 5, a liquid cavity 1, two sealing pads 2, a pressurized air source, an exhaust pipe 8 and a locking screw 7.

[0042] The support base 6 includes a fixed base 61 and two support columns 62, which are vertically fixed to either side of the fixed base 61. Preferably, in this embodiment, the fixed base 61 includes two opposing rectangular base plates 611 and three connecting rods 612 transversely connected between the two rectangular base plates 611. Simultaneously, the two support columns 62 are symmetrically provided with multiple weight-reducing holes of varying sizes. Combined with the configuration of the fixed base 61, this significantly reduces the weight of the entire test device and improves the portability of the diaphragm bubble point pressure test device. Furthermore, the weight-reducing holes provide grip points for transporting the test device while reducing weight.

[0043] The air cavity 5 is a barrel-shaped structure with a spherical bottom. Two cylindrical protrusions 4 are symmetrically arranged on its outer wall. Two support columns 62 are each provided with a U-shaped groove that matches the cylindrical protrusions 4. The two cylindrical protrusions 4 are respectively installed in the two U-shaped grooves, allowing the air cavity 5 to rotate relative to the support columns 62. The length direction of the two rectangular bottom plates 611 is perpendicular to the rotation axis of the air cavity 5, ensuring that the center of gravity of the air cavity 5 falls within the interior of the support base 6, ensuring the stability of the entire diaphragm bubble point pressure testing device.

[0044] A first sealing flange is provided at the upper end of the air cavity 5; the liquid cavity 1 is a hollow cylindrical structure open at the top and bottom, and a second sealing flange compatible with the first sealing flange is provided at its lower end. The air cavity 5 and the liquid cavity 1 are fixedly connected via the first and second sealing flanges. Specifically, the first sealing flange is provided with multiple first threaded holes in the circumferential direction, and the second sealing flange is provided with multiple mounting holes at corresponding positions. Multiple fastening screws 3 are respectively passed through the corresponding mounting holes and threadedly connected to the first threaded holes to lock the air cavity 5 and the liquid cavity 1. Two first positioning holes are provided on the first sealing flange, and the two first positioning holes are symmetrically arranged about the center. Two second positioning holes are provided at corresponding positions on the second sealing flange. Before locking the air cavity 5 and the liquid cavity 1 with the fastening screws 3, two positioning guide pillars 10 are first passed through the corresponding first and second positioning holes to achieve alignment and positioning of the first and second sealing flanges.

[0045] The diaphragm to be tested is circumferentially clamped between the first sealing flange of the air chamber 5 and the second sealing flange of the liquid chamber 1, with two sealing gaskets 2 ensuring airtightness. Specifically, one sealing gasket 2 is installed between the first sealing flange and the diaphragm to be tested, and the other sealing gasket 2 is installed between the diaphragm to be tested and the second sealing flange, thereby achieving a circumferentially sealed installation of the diaphragm to be tested. After the diaphragm to be tested is installed, the liquid chamber 1 can be filled with a transparent liquid, typically water, during the test process. The internal cavity of the liquid chamber 1 also serves as a test observation window for observing bubbles generated on the upper surface of the diaphragm to be tested during the test.

[0046] The air cavity 5 comprises a spherical bottom structure and cylindrical sidewalls. An air inlet nozzle 11 is radially defined at the transition between the bottom spherical surface and the sidewall cylindrical surface. The air inlet nozzle 11 is equidistant from the corresponding positions of the two support columns 62. Placing the air inlet nozzle at the transition between the bottom spherical surface and the sidewall cylindrical surface ensures a uniform gas pressure field within the air cavity 5. This equidistant distance between the air inlet nozzle 11 and the corresponding positions of the two support columns 62 ensures that any remaining liquid can enter the air inlet nozzle 11 smoothly as the air cavity 5 rotates.

[0047] The outer end of the air inlet nozzle 11 is used to connect the pressurized air source when the air cavity is pressurized, so as to introduce pressurized gas into the air cavity 5 during the test. Since the water in the liquid cavity 1 will enter the air cavity 5 during the test, and the water in the air cavity 5 needs to be drained after the test to keep the air cavity 5 dry, the present invention drains the water in the air cavity 5 through the air inlet nozzle 11 after the test, which avoids the setting of a separate drainage hole and effectively improves the air tightness of the test device. In order to allow the water in the air cavity 5 to be smoothly discharged through the air inlet nozzle 11, the present invention cleverly rotates the air cavity 5 on the support seat 6, tilting it at a certain angle to a state where the water can smoothly flow into the air inlet nozzle 11 and be discharged outside the air cavity 5. Among them, the pressurized air source can be an inert gas and compressed air, and helium or nitrogen is usually selected.

[0048] An exhaust nozzle 9 is radially disposed on the sidewall of the air cavity 5, near the top. The outer end of the exhaust nozzle 9 is connected to an exhaust pipe 8, which is equipped with a pressure gauge 12 and a shutoff valve 13, arranged in order from the inside to the outside. The pressure gauge 12 measures the pressure in the exhaust pipe 8 when the first bubble forms at the interface between the diaphragm under test and the water. This pressure, in other words, measures the pressure within the air cavity 5, thereby representing the bubble point pressure parameter of the diaphragm under test. The shutoff valve 13 controls the switching between pressure maintenance and exhaust.

[0049] A threaded hole is provided on the support column 62 at a position corresponding to the outer wall of the air cavity 5. One end of the locking screw 7 is used to pass through the threaded hole and abut against the outer wall of the air cavity 5 to ensure that the test device remains stable during the test and does not rotate or shake.

[0050] Based on the above-mentioned diaphragm bubble point pressure testing device, the present invention also provides a diaphragm bubble point pressure testing method, which specifically includes the following steps:

[0051] Step 1: Build the above-mentioned diaphragm bubble point pressure testing device;

[0052] Step 2: Lock the air cavity 5 by means of the locking screw 7, and install the diaphragm to be tested between the first sealing flange and the second sealing flange in a circumferentially sealed manner by means of the sealing gasket 2;

[0053] Step 3: Close the stop valve 13 and slowly inject water into the liquid chamber 1 to fully soak the diaphragm to be tested. At this time, a closed space is formed between the diaphragm to be tested and the interior of the air chamber 5.

[0054] Step 4: connect an external pressurized air source to the air inlet nozzle 11, and open the air inlet nozzle 11 to slowly increase the pressure in the enclosed space of the air cavity 5;

[0055] Step 5: Observe the upper surface of the diaphragm to be tested through the internal cavity of the liquid chamber 1. When the first bubble is generated at the contact interface between the diaphragm to be tested and the water, stop pressurizing and read the value of the pressure gauge 12 to obtain the bubble point pressure parameter of the diaphragm to be tested.

[0056] After obtaining the bubble point pressure value of the diaphragm to be tested, loosen the locking screw 7, rotate and tilt the air cavity 5 and the liquid cavity 1 as a whole, so that the water in the air cavity 5 flows smoothly into the air inlet nozzle 11 and is discharged from the outside of the air cavity 5 to ensure that the air cavity 5 is dry.

[0057] The above description is only used to illustrate the technical solution of the present invention, rather than to limit it. For ordinary professional and technical personnel in this field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution protected by the present invention.

Claims

1. A diaphragm bubble point pressure testing device, characterized in that: It comprises a support seat (6), an air cavity (5), a liquid cavity (1), a pressurized air source, an exhaust pipe (8) and a locking screw (7); The support base (6) comprises a fixed base (61) and two support columns (62), and the two support columns (62) are vertically fixed on both sides of the fixed base (61); The air cavity (5) is a barrel-shaped structure with a spherical bottom, and its two opposite side walls are rotatably connected to two support columns (62), and a first sealing flange is provided at the upper end of the air cavity (5); The liquid cavity (1) is a hollow cylindrical structure with upper and lower openings, and a second sealing flange adapted to the first sealing flange is provided at its lower end; the first sealing flange and the second sealing flange are fixedly connected, and the diaphragm to be tested is circumferentially sealed and clamped between the first sealing flange and the second sealing flange; the upper end of the liquid cavity (1) is used for injecting a transparent liquid; An air inlet nozzle (11) is radially provided at a transition position between the bottom spherical surface of the air cavity (5) and the cylindrical surface of the side wall, and the air inlet nozzle (11) is at an equal straight-line distance from the corresponding positions of the two support columns (62). The outer end of the air inlet nozzle (11) is used to connect to a pressurized gas source to introduce pressurized gas into the air cavity (5) when the air cavity is pressurized, and is used to discharge the remaining liquid in the air cavity (5) after the test is completed. An exhaust nozzle (9) is radially provided at a position near the top of the side wall of the air cavity (5), and the outer end of the exhaust nozzle (9) is connected to an exhaust pipe (8). A pressure gauge (12) and a stop valve (13) are sequentially provided on the exhaust pipe (8) from the inside to the outside. A threaded hole is provided on the support column (62) at a position corresponding to the outer wall of the air cavity (5), and one end of the locking screw (7) is used to pass through the threaded hole and abut against the outer wall of the air cavity (5).

2. The diaphragm bubble point pressure testing device according to claim 1, characterized in that: Also includes a visual unit; The visual unit is located above the liquid chamber (1) and is used to synchronously photograph the state of the upper surface of the diaphragm to be measured and the value of the pressure gauge (12).

3. A diaphragm bubble point pressure testing device according to claim 1 or 2, characterized in that: Also includes two sealing pads (2); One sealing gasket (2) is arranged between the first sealing flange and the diaphragm to be tested, and another sealing gasket (2) is arranged between the diaphragm to be tested and the second sealing flange, for achieving circumferential sealing installation of the diaphragm to be tested.

4. The diaphragm bubble point pressure testing device according to claim 3, characterized in that: Two cylindrical protrusions (4) are symmetrically arranged on the outer wall of the air cavity (5), and U-shaped grooves adapted to the cylindrical protrusions (4) are respectively opened on the two support columns (62). The two cylindrical protrusions (4) are respectively installed in the two U-shaped grooves to enable the air cavity (5) to rotate relative to the support columns (62).

5. The diaphragm bubble point pressure testing device according to claim 4, characterized in that: The fixed base (61) comprises two rectangular base plates (611) arranged opposite to each other, and a plurality of connecting rods (612) laterally connected between the two rectangular base plates (611); The length directions of the two rectangular bottom plates (611) are both perpendicular to the rotation axis of the air cavity (5).

6. The diaphragm bubble point pressure testing device according to claim 1, characterized in that: It also includes a plurality of fastening screws (3) and two positioning guide pillars (10); The first sealing flange is provided with a plurality of first threaded holes in the circumferential direction, and the second sealing flange is provided with a plurality of mounting holes at corresponding positions, and a plurality of fastening screws (3) are respectively passed through the corresponding mounting holes and threadedly connected to the first threaded holes; The first sealing flange is provided with two first positioning holes, which are symmetrically arranged about the center; the second sealing flange is provided with two second positioning holes at corresponding positions; and two positioning guide pillars (10) respectively pass through the corresponding first positioning holes and second positioning holes to achieve alignment and positioning.

7. A diaphragm bubble point pressure testing device according to claim 6, characterized in that: A plurality of weight-reducing holes of different sizes are symmetrically provided on the two support columns (62).

8. The diaphragm bubble point pressure testing device according to claim 1, characterized in that: The pressurized gas source is inert gas or compressed air.

9. A method for testing the bubble point pressure of a diaphragm, characterized in that: The following steps are involved: Step 1: constructing the diaphragm bubble point pressure testing device according to any one of claims 1 to 8; Step 2: Install the diaphragm to be tested circumferentially sealably between the first sealing flange and the second sealing flange; Step 3, close the stop valve (13), slowly inject transparent liquid into the liquid cavity (1), so that the transparent liquid fully infiltrates the diaphragm to be tested, and at this time, a closed space is formed between the diaphragm to be tested and the interior of the air cavity (5); Step 4, connect an external pressurized air source to the air inlet nozzle (11), and slowly increase the pressure into the enclosed space of the air cavity (5) through the air inlet nozzle (11); Step 5: Observe the upper surface of the diaphragm to be tested through the inner cavity of the liquid cavity (1), and stop pressurizing when the first bubble is generated at the contact interface between the diaphragm to be tested and the transparent liquid, and read the value of the pressure gauge (12) to obtain the bubble point pressure value of the diaphragm to be tested.

10. A diaphragm bubble point pressure testing method according to claim 9, characterized in that: In step 3, the transparent liquid is water.

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