Diaphragm surface resistance testing device

Abstract

The utility model provides a diaphragm surface resistance testing device, which comprises two end plates arranged opposite to each other, the two end plates are respectively provided with a detection cavity and a liquid inlet communicated with the respective detection cavity, the opening positions of the two detection cavities are respectively provided with a first sealing gasket, a positioning block is arranged between the two end plates, and a second sealing gasket is arranged between the two end plates. The positioning block abuts against the front end faces of the two end plates, and the distance between the two end plates is limited through the positioning block. The two detection cavities are respectively and internally provided with an electrode plate, the two electrode plates are symmetrically arranged on the two sides of the diaphragm, the two electrode plates are respectively provided with a wiring electrode, and the wiring electrodes backwards penetrate out of the detection cavities. The distance between the two electrode plates is kept constant, and the diaphragm to be detected is clamped and fixed between the two electrode plates by the two sealing gaskets, so that the same electric field environment is provided for surface resistance detection of diaphragms with different thicknesses, and the surface resistance detection accuracy of the diaphragms with different thicknesses is improved.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen production by water electrolysis, and in particular relates to a testing device for the surface resistance of a diaphragm. Background Technology

[0002] Alkaline water electrolysis for hydrogen production involves applying direct current between the positive and negative electrodes of an alkaline electrolyzer. Hydrogen and oxygen are simultaneously generated at the corresponding anode and cathode. The diaphragm used in this technology separates the anode and cathode, preventing the generated hydrogen and oxygen from mixing, while simultaneously providing a transport channel for ions. Therefore, the diaphragm is one of the key internal components in the structure of an alkaline water electrolyzer for hydrogen production.

[0003] Sheet resistance is an important data point for characterizing the electrical performance of a diaphragm. Currently, electrolytic cells are commonly used to test the sheet resistance of diaphragms in alkaline electrolyzed water. However, the current method of testing diaphragms using electrolytic cells has the following drawbacks: due to the difference in diaphragm thickness, it is difficult to keep the distance between the positive and negative electrode plates that provide the electric field for diaphragm sheet resistance testing constant. In other words, it is difficult to provide the same electric field testing environment for diaphragms of different thicknesses, resulting in low accuracy of diaphragm sheet resistance testing. Utility Model Content

[0004] In view of this, the present invention aims to provide a testing device for the surface resistance of a diaphragm, so as to detect the surface resistance of diaphragms of different thicknesses and improve the accuracy of diaphragm surface resistance detection.

[0005] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0006] A testing apparatus for diaphragm surface resistance, including

[0007] Two end plates, with their front faces facing each other and detachably connected, each end plate has a detection chamber on its front face, the two detection chambers facing each other, each end plate has a liquid inlet communicating with its respective detection chamber, each end plate has a first sealing gasket around its respective detection chamber on its front face, the diaphragm to be tested faces the detection chamber and is clamped and fixed between the two first sealing gaskets, and a positioning block is provided between the two end plates, the positioning block abutting against the front face of the two end plates, the positioning block limiting the distance between the two end plates;

[0008] An electrode plate is fixedly installed in each of the two detection chambers. The two electrode plates are symmetrically arranged on both sides of the diaphragm and face the diaphragm. Each of the two electrode plates is provided with a wiring electrode, which extends backward out of the detection chamber.

[0009] Furthermore, the front ends of the electrode plates and the corresponding end plates are flush, and the height of the positioning block itself is the same as the distance between the two electrode plates that provide an electric field for the detection of the diaphragm surface resistance.

[0010] Furthermore, the positioning block is disposed on one of the end plates.

[0011] Furthermore, several positioning blocks are evenly arranged around the first sealing gasket.

[0012] Furthermore, the wiring electrode is a copper rod.

[0013] Furthermore, a sealing groove is provided on the front end face of the end plate corresponding to the first sealing gasket, and the first sealing gasket is embedded in the sealing groove.

[0014] Furthermore, the back of the end plate is provided with an electrolyte cavity, which is connected to the detection cavity. The inlet is located on the wall of the electrolyte cavity, and the wiring electrode extends out from the electrolyte cavity.

[0015] Furthermore, a circulating water cavity is provided outside the electrolyte cavity, and the circulating water cavity covers the electrolyte cavity. The wiring electrode and the liquid inlet both protrude from the circulating water cavity. A water inlet connector is provided at one end of the circulating water cavity and a water outlet connector is provided at the other end.

[0016] Furthermore, the two end plates are connected by bolts.

[0017] Compared with existing technologies, the diaphragm surface resistance testing device created by this invention has the following advantages:

[0018] (1) In this invention, the distance between the two end plates is limited by the positioning block, which in turn limits the distance between the two electrode plates, so that the distance between the two electrode plates remains constant. The diaphragm to be tested is held and fixed between the two electrode plates by the two first sealing pads, providing the same electric field environment for the surface resistance detection of diaphragms of different thicknesses, thereby improving the accuracy of surface resistance detection of diaphragms of different thicknesses.

[0019] (2) In this invention, the dual-cavity structure of the electrolyte cavity and the circulating water cavity provides a constant temperature environment for the detection of diaphragm surface resistance, thereby improving the detection accuracy. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the test device for the surface resistance of the diaphragm as described in this invention;

[0022] Figure 2 A three-dimensional schematic diagram of the end plate with positioning blocks in the test device of the present invention;

[0023] Figure 3This invention provides a diagram showing the arrangement of the liquid inlet, water inlet connector, and water outlet connector on the back of the end plate of the test device.

[0024] Figure 4 A schematic diagram showing that the sealing groove on the end plate is opened outside the detection cavity and arranged around the detection cavity;

[0025] Figure 5 The end plate of this device adopts Figure 4 Diagram showing the diaphragm clamping state during the sealing groove structure;

[0026] Figure 6 This invention provides a structural diagram of the connection between the electrode sheet and the wiring electrode.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-End plate; 101-Detection chamber; 102-Sealing groove; 103-Electrolyte cavity; 104-Circulating water cavity; 2-Bolt; 3-Diaphragm; 4-Inlet; 5-First sealing gasket; 6-Electrode plate; 7-Insulating jacket; 8-Connecting electrode; 9-Fixing tube; 10-Positioning block; 11-Third sealing gasket; 12-Threaded cap; 13-Fixing block; 14-Second sealing gasket; 15-Nut; 16-Inlet connector; 17-Outlet connector; 18-Fourth sealing gasket. Detailed Implementation

[0029] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1, as Figure 1 , Figure 2 and Figure 3As shown, the diaphragm surface resistance testing device includes two end plates 1 and two electrode plates 6. The front ends of the two end plates 1 face each other and are connected by four bolts 2. A detection chamber 101 is respectively provided at the center of the front ends of the two end plates 1. A cover is provided on the back side (the side facing away from the front end of the end plate) of each end plate 1. This cover and the back side of the end plate 1 form an electrolyte cavity 103. The detection chamber 101 penetrates the back side of the end plate 1 and communicates with the electrolyte cavity 103. The electrolyte cavity 103 is provided with an inlet 4, through which electrolyzed water is injected into the electrolyte cavity 103 and then into the detection chamber 101. A sealing groove 102 is provided around the detection cavity 101 on the front end side of each end plate 1. A first sealing gasket 5 is installed in the sealing groove 102. The first sealing gasket 5 is a rubber sealing gasket structure with a certain thickness. After installation, the first sealing gasket 5 protrudes from the front end side of the end plate 1, so that the two first sealing gaskets 5 can clamp the diaphragm 3. Several positioning blocks 10 are evenly arranged around the first sealing gasket 5 on the front end face of one of the end plates 1. The positioning blocks 10 protrude from the end plate at the same height, and the positioning blocks 10 abut against the front end face of the other end plate 1. After the diaphragm 3 is clamped by the two first sealing gaskets 5, the bolts 2 connect and fix the two end plates 1. The height of the positioning blocks 10 protruding from the corresponding end plates determines the distance between the two end plates 1.

[0031] In this invention, the two end plates 1, the cover corresponding to the electrolyte cavity 103, and the positioning block 10 are all made of insulating materials, such as non-conductive high-performance polymer materials, including but not limited to acrylic materials or polysulfone resin materials.

[0032] Each of the two detection chambers 101 contains an electrode plate 6, with a gap between the electrode plate 6 and the chamber wall to allow electrolyte to pass through. The two electrode plates 6 are symmetrically arranged on both sides of the diaphragm 3 and face directly towards it. A connecting electrode 8, preferably a copper rod, is connected to the center of the back of each electrode plate 6. The connecting electrode 8 extends rearward through the electrolyte cavity 103. The connecting electrode 8 of one electrode plate 6 is connected to the positive terminal of the power supply of the resistance detector, and the connecting electrode 8 of the other electrode plate 6 is connected to the negative terminal of the power supply of the resistance detector.

[0033] As an optimization, the front end face of each electrode plate 6 is flush with the corresponding end plate 1, and the height of the positioning block 10 itself is the same as the set distance between the two electrode plates that provide an electric field for the diaphragm surface resistance detection. For example, if the set distance is currently 10mm, then the positioning block 10 adopts a height of 10mm. In this way, even if there are differences in diaphragm thickness, it can be ensured that the distance between the two electrode plates 6 is 10mm, which means that diaphragms of different thicknesses are in the same electric field environment for surface resistance detection, thus ensuring the accuracy of the detection.

[0034] In this invention, the electrode sheet 6 can be fixed to the detection chamber 101 by an insulating support. The insulating support has a hollow structure to allow the electrolyte to pass through. Alternatively, the electrode sheet 6 can be fixed by fixing the connecting electrode 8, such as by connecting and fixing the connecting electrode 8 to the housing. Another possible fixing structure is as follows: a fixing tube 9 is provided on the outer surface of the electrolyte chamber 103, corresponding to the connecting electrode 8, and the fixing tube 9 is connected to the electrolyte chamber 103. An insulating jacket 7 is fixed to the outside of the connecting electrode 8, with the outer end of the connecting electrode 8, i.e., the end away from the electrode sheet 6, extending out of the insulating jacket 7. A fixing block 13 is interference-fitted to the outer port of the fixing tube 9. The fixing block 13 is an insulating component and has a T-shaped structure. A third sealing gasket 11 is provided between the fixing block 13 and the fixing tube 9 to prevent electrolyte leakage. A threaded cap 12 is threaded to the outer end of the fixed tube 9. The insulating jacket 7 passes through the fixed tube 9, the fixed block 13, and the threaded cap 12 in sequence. A second sealing gasket 14 is fixedly fitted onto the insulating jacket 7 between the threaded cap 12 and the fixed block 13. If adhesive is used to fix the second sealing gasket 14 and the insulating jacket 7 together, the second sealing gasket 14 will seal the insulating jacket 7, preventing electrolyte leakage from the connection between the insulating jacket 7 and the fixed block 13. At the same time, it will also fix the position of the electrode plate 6, providing a stable electric field environment for the diaphragm surface resistance detection. Alternatively, after the insulating jacket 7 passes through the fixed block 13, adhesive can be filled into the gap between the insulating jacket 7 and the fixed block 13 to fix the insulating jacket 7 and the fixed block 13 together. Then, the second sealing gasket 14 can be used to seal this position to ensure that the electrode plate 6 is fixed.

[0035] Similarly, the inlet 4 adopts a pipe structure that communicates with the electrolyte cavity 103 and is located outside the casing corresponding to the electrolyte cavity 103. Its outer port is equipped with the same sealing structure as the outer port of the fixed pipe 9, that is, a T-shaped fixing block 13 is inserted into the inlet, and a third sealing gasket 11 is set between the fixing block 13 and the end face of the inlet. Then, a threaded cap 12 is used to seal the outer port of the inlet 4. When the electrolyte is injected through the inlet 4 in the non-working state or during testing, the inlet 4 is sealed by this sealing structure.

[0036] In this invention, the electrode plate 6 and the wiring electrode 8 are connected by a nut-thread locking method, as shown in the following structure. Figure 6As shown, the tail end of the terminal electrode 8 has an external thread, through which the insulating jacket 7 and the electrode plate 6 pass sequentially. The electrode plate 6 is then tightly pressed and fixed to the insulating jacket 7 by a matching nut 15, thus connecting and fixing the electrode plate 6 and the terminal electrode 8. A fourth sealing gasket 18 is provided between the electrode plate 6 and the insulating jacket 7 on the terminal electrode 8. Alternatively, the terminal electrode 8 and the insulating jacket 7 can be press-fitted or heat-sealed, or the gap between the terminal electrode 8 and the insulating jacket 7 can be filled with sealant while simultaneously fixing the terminal electrode 8 and the insulating jacket 7. These structures achieve a seal between the terminal electrode 8 and the insulating jacket 7, preventing electrolyte leakage through the gap between them. It should be noted that, in addition to the above connection structures, the electrode plate 6 and the terminal electrode 8 can also be fixed together using other methods such as welding.

[0037] In this invention, a circulating water chamber 104 is provided outside the electrolyte container 103, enclosing the electrolyte container 103. The fixing tube 9 and the liquid inlet 4 both extend from the circulating water chamber 104. One end of the circulating water chamber 104 is provided with a water inlet connector 16, and the other end with a water outlet connector 17. Water at a constant temperature is injected into the circulating water chamber 104 through the water inlet connector 16 from one side of the circulating water chamber 104. After heat exchange with the electrolyte in the electrolyte container 103, the water is discharged from the water outlet connector 17 on the other side of the circulating water chamber 104, ensuring that the temperature of the electrolyzed water remains constant. This provides a standard temperature environment for diaphragm surface resistance testing, thereby improving the accuracy of the test.

[0038] It should be noted that in this invention, the detection cavity 101 includes, but is not limited to, a circular cavity; it can also be a square cavity or a cavity of other shapes. The first sealing gasket 5 includes, but is not limited to, a circular gasket; it can also be a square gasket or a gasket of other shapes. The sealing groove 102 is formed on the front end face of the end plate, and its position, in addition to being located at... Figure 1 , Figure 2 The opening of the detection cavity 101 shown can also be formed outside the opening of the detection cavity 101 and surrounding the detection cavity 101, such as... Figure 4 As shown, at this time, the first sealing gasket 5 is installed and clamps the diaphragm as follows: Figure 5 As shown. Regardless of which of the two states the sealing groove 102 adopts, it can ensure that the first sealing gasket 5 surrounds the detection cavity 101 after installation.

[0039] The operation process of this device is as follows: The diaphragm 3 to be tested is installed between two first sealing gaskets 5. The two end plates 1 are connected and fixed using bolts 2, ensuring that the positioning block 10 on one end plate 1 can abut against the other end plate 1. At this time, the diaphragm 3 is also clamped and fixed by the two first sealing gaskets 5. During the test, the two end plates 1 are in a vertical state, with the liquid inlet 4 at the top. An electrolyte of a certain concentration, i.e., an alkaline solution such as potassium hydroxide solution or sodium hydroxide solution, is injected into the electrolyte cavity 103 through the liquid inlet 4, and then into the detection cavity 101. At this time, the electrode plates 6 are completely immersed in the electrolyte. One electrode plate 6 is connected to the positive terminal of the power supply of the resistance detector through the wiring electrode 8, and this electrode plate 6 is the anode. The other electrode plate 6 is connected to the negative terminal of the power supply of the resistance detector through the wiring electrode 8, and this electrode plate 6 is the cathode. The two electrode plates 6 begin to electrolyze the electrolyte, and the resistance detector can detect the surface resistance of the diaphragm. The specific detection steps are existing technology and will not be described in detail here. It should be noted that during the testing process, circulating water at the standard temperature is introduced into the circulating water chamber 104 through the inlet and outlet water connectors to ensure that the electrolyte temperature meets the testing temperature requirements and remains constant, thereby improving the accuracy of the test.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the surface resistance of a diaphragm, characterized in that: include Two end plates (1) are connected detachably with their front faces facing each other. Each end plate (1) has a detection chamber (101) on its front face. The two detection chambers (101) face each other. Each end plate (1) has an inlet (4) that communicates with its respective detection chamber (101). Each end plate (1) has a first sealing gasket (5) around its respective detection chamber (101) on its front face. The diaphragm (3) to be tested faces the detection chamber (101) and is clamped and fixed between the two first sealing gaskets (5). A positioning block (10) is provided between the two end plates (1). The positioning block (10) abuts against the front face of the two end plates (1) and limits the distance between the two end plates (1) by the positioning block (10). An electrode plate (6) is fixedly installed in each of the two detection chambers (101). The two electrode plates (6) are symmetrically arranged on both sides of the diaphragm (3) and face the diaphragm (3). Each of the two electrode plates (6) is provided with a wiring electrode (8), which extends backward out of the detection chamber (101).

2. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: The front end faces of the electrode sheet (6) and the corresponding end plate (1) are flush, and the height of the positioning block (10) is the same as the distance between the two electrode plates that provide an electric field for the surface resistance detection of the diaphragm (3).

3. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: The positioning block (10) is disposed on one of the end plates (1).

4. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: Several positioning blocks (10) are evenly arranged around the first sealing gasket (5).

5. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: The wiring electrode (8) is a copper rod.

6. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: The front end face of the end plate (1) is provided with a sealing groove (102) corresponding to the first sealing gasket (5), and the first sealing gasket (5) is embedded in the sealing groove (102).

7. The apparatus for testing the surface resistance of a diaphragm according to claim 1, characterized in that: The end plate (1) has an electrolyte cavity (103) on its back side. The electrolyte cavity (103) is connected to the detection cavity (101). The inlet (4) is located on the wall of the electrolyte cavity (103). The wiring electrode (8) passes through the electrolyte cavity (103).

8. The apparatus for testing the surface resistance of a diaphragm according to claim 7, characterized in that: A circulating water chamber (104) is provided outside the electrolyte cavity (103). The circulating water chamber (104) covers the electrolyte cavity (103). The wiring electrode (8) and the liquid inlet (4) both protrude from the circulating water chamber (104). One end of the circulating water chamber (104) is provided with a water inlet connector (16) and the other end is provided with a water outlet connector (17).

9. The apparatus for testing the surface resistance of a diaphragm according to claim 7, characterized in that: The two end plates (1) are connected by bolts (2).

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