Device and method for automatically testing diaphragm bubble point pressure

Abstract

The present invention discloses a device for automatically testing the bubble point pressure of a diaphragm, comprising: a gas pipeline; a pressure control valve arranged at the front end of the gas pipeline; a pressure sensor arranged downstream of the pressure control valve; a first solenoid valve arranged in parallel with the pressure sensor; a second solenoid valve arranged in series with the pressure sensor, the second solenoid valve being arranged downstream of the pressure sensor; a membrane holder, the membrane holder being arranged in series downstream of the first solenoid valve; a liquid level sensor connected to the membrane holder; a control cabinet, the pressure control valve, the pressure sensor, the liquid level sensor, the first solenoid valve and the second solenoid valve being electrically connected to the control cabinet. The present invention adopts the coordinated use of the pressure control valve, the solenoid valve, the liquid level sensor, the pressure sensor and the control cabinet to realize the automatic measurement of the bubble point pressure of the diaphragm, and no manual monitoring and recording are required during the test, thereby improving the test efficiency of the bubble point pressure of the diaphragm.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic hydrogen production, and in particular to a device and method for automatically testing the bubble point pressure of a diaphragm. Background Art

[0002] With the rapid development of the global economy, fossil energy shortages and environmental pollution have become two major issues in the 21st century, and the development of efficient, renewable and clean energy is urgent. Hydrogen energy has the advantages of wide sources, clean and carbon-free, flexible and efficient, and rich application scenarios. It is considered to be an important carrier to support energy transformation and construction of a modern energy system, and is one of the major strategic directions of my country's energy transformation. Hydrogen production by water electrolysis is a green and environmentally friendly method of producing hydrogen with a relatively simple and flexible production process. Hydrogen production by water electrolysis is mainly divided into three types: alkaline water electrolysis, proton membrane water electrolysis, and solid oxide water electrolysis. Among them, alkaline water electrolysis is the most widely used. Under the blessing of direct current, the water in the alkaline water electrolyzer will produce hydrogen and oxygen at the cathode and anode respectively. In order to avoid the mixture of hydrogen and oxygen and cause an explosion, a diaphragm is needed between the cathode and the anode to physically separate the two. Therefore, it is necessary to select diaphragm materials with good gas barrier properties. The gas barrier properties of diaphragm materials can be evaluated by bubble point pressure testing. However, the currently used bubble point pressure testing device requires manual monitoring during the entire test process, which is time-consuming and has low test efficiency. Summary of the invention

[0003] In view of the technical problems that the bubble point pressure test device in the above-mentioned prior art requires manual monitoring during the test process and the test efficiency is low, the present invention proposes a device and method for automatically testing the bubble point pressure of the diaphragm. The device for automatically testing the bubble point pressure of the diaphragm provided by the present invention realizes the automatic measurement of the bubble point pressure of the diaphragm and improves the measurement efficiency.

[0004] The device for automatically testing the bubble point pressure of a diaphragm according to the present invention comprises:

[0005] Gas pipelines;

[0006] A pressure control valve disposed at the front end of the gas pipeline;

[0007] a pressure sensor disposed downstream of the pressure control valve;

[0008] a first solenoid valve arranged in parallel with the pressure sensor;

[0009] a second solenoid valve arranged in series with the pressure sensor, the second solenoid valve being arranged downstream of the pressure sensor;

[0010] a membrane holder, the membrane holder being arranged in series downstream of the first solenoid valve, the membrane holder comprising a liquid reservoir;

[0011] A liquid level sensor, the liquid level sensor being fixed to the upper end of the liquid reservoir;

[0012] A control cabinet, the pressure control valve, the pressure sensor, the liquid level sensor, the first solenoid valve and the second solenoid valve are all electrically connected to the control cabinet.

[0013] In some embodiments, the film holder further comprises:

[0014] Chassis;

[0015] A gas inlet disposed at the lower end of the chassis;

[0016] A membrane placement area for placing a membrane sample, wherein the membrane sample is sealed and arranged on the upper end of the bottom plate through a sealing ring;

[0017] A support plate is arranged above the membrane placement location, and the liquid reservoir is arranged above the support plate;

[0018] A locking ring is used to lock the chassis and the liquid reservoir.

[0019] In some embodiments, the lower end of the liquid reservoir is open, and the upper end of the liquid reservoir is in the shape of an elongated tube.

[0020] In some embodiments, the support disk is a porous plate.

[0021] In some embodiments, the diameter of the membrane sample is 15-100 mm.

[0022] In some embodiments, the gas in the gas pipeline is nitrogen or air.

[0023] In some embodiments, the liquid reservoir is used to contain liquid that completely soaks the membrane sample.

[0024] In some embodiments, the liquid is ethanol.

[0025] The liquid can completely wet the membrane sample, and may be ethanol or other suitable liquids.

[0026] The method for automatically testing the bubble point pressure of a diaphragm according to the present invention comprises the following steps:

[0027] (1) placing the membrane sample in a liquid that can completely wet it, and installing it in a membrane holder after it is completely wetted;

[0028] (2) adding liquid from the upper end of the liquid reservoir that can completely wet the diaphragm sample;

[0029] (3) When the second solenoid valve is closed, the pressure control valve and the first solenoid valve are opened;

[0030] (4) The pressure control valve controls the gas pressure entering the membrane holder to gradually increase. When the gas begins to pass through the membrane sample and bubble in the liquid reservoir, the liquid level in the liquid reservoir rises, and the liquid level sensor transmits a liquid level change signal to the control cabinet;

[0031] (5) After receiving the liquid level change signal, the control cabinet issues an instruction to record the pressure value measured by the pressure sensor at that moment, open the second solenoid valve, close the first solenoid valve, and the test is completed.

[0032] The liquid level in the liquid reservoir is higher than the lowest liquid level monitoring limit of the liquid level sensor and lower than the highest liquid level monitoring limit.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] The present invention adopts the coordinated use of a pressure control valve, a solenoid valve, a liquid level sensor, a pressure sensor, and a control cabinet to realize the automatic measurement of the diaphragm bubble point pressure;

[0035] When the present invention tests the bubble point pressure of the diaphragm, the testing device is simple and easy to use, and no manual monitoring and recording are required during the testing process, thereby improving the testing efficiency of the bubble point pressure of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0037] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0038] Figure 2 It is a schematic structural diagram of the membrane holder of the present invention.

[0039] Description of reference numerals:

[0040] Pressure control valve 1, membrane holder 2, liquid level sensor 3, pressure sensor 4, control cabinet 5, first solenoid valve 6, second solenoid valve 7, gas pipeline 8, gas inlet 9, chassis 10, sealing ring 11, membrane placement 12, support plate 13, locking ring 14, liquid reservoir 15. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following describes an apparatus and method for automatically testing the bubble point pressure of a diaphragm according to an embodiment of the present invention with reference to the accompanying drawings.

[0043] like Figure 1-2 As shown, the device for automatically testing the bubble point pressure of a diaphragm of the present invention comprises: a pressure control valve 1, a gas pipeline 8, a pressure sensor 4, a membrane holder 2, a liquid level sensor 3, a control cabinet 5, a first solenoid valve 6, and a second solenoid valve 7.

[0044] The gas pipeline 8 is used for gas to pass through, and the gas used in the present invention is nitrogen or air.

[0045] In some embodiments, the pressure control valve 1 is disposed at the front end of the gas pipeline 8. It is understood that the pressure control valve 1 is used to control the gas pressure at the outlet of the pressure control valve through the gas pipeline 8. During the test, the pressure control valve 1 controls the gas pressure at the outlet of the pressure control valve to gradually increase from a low pressure.

[0046] In some embodiments, the pressure sensor 4 is disposed downstream of the pressure control valve 1. It can be understood that the pressure sensor 4 is used to measure the pressure of the gas inlet 9 in the membrane holder 2.

[0047] In some embodiments, a first solenoid valve 6 is arranged in parallel with the pressure sensor 4, and a membrane holder 2 is arranged in series downstream of the first solenoid valve 6. It can be understood that when the first solenoid valve 6 is opened, the gas passes through the first solenoid valve 6 and enters the membrane holder 2; when the first solenoid valve 6 is closed, the gas cannot enter the membrane holder 2.

[0048] In some embodiments, the second solenoid valve 7 is disposed downstream of the pressure sensor 4, and the second solenoid valve 7 is disposed in series with the pressure sensor 4. It can be understood that when the first solenoid valve 6 is opened and the second solenoid valve 7 is closed, the gas enters the membrane holder 2 through the first solenoid valve 6; when the first solenoid valve 6 is closed and the second solenoid valve 7 is opened, the gas flows out through the second solenoid valve 7.

[0049] In some embodiments, the pressure control valve 1, the pressure sensor 4, the liquid level sensor 3, the first solenoid valve 6 and the second solenoid valve 7 are all electrically connected to the control cabinet 5. The control cabinet 5 realizes the opening and closing of the solenoid valve by controlling the first solenoid valve 6 and the second solenoid valve 7. The control cabinet 5 controls the pressure control valve 1 to control the gas pressure at the outlet of the pressure control valve. The control cabinet 5 monitors the liquid level by being electrically connected to the liquid level sensor 3, and determines the time of testing the bubble point pressure according to the feedback liquid level information. The control cabinet 5 also has the function of collecting data from the pressure sensor 4.

[0050] In some embodiments, the membrane holder 2 includes a gas inlet 9 , a bottom plate 10 , a sealing ring 11 , a membrane placement 12 , a support plate 13 , a locking ring 14 and a liquid reservoir 15 .

[0051] In some embodiments, a gas inlet 9 is disposed at the lower end of the bottom plate 10 for gas to pass through.

[0052] In some embodiments, the membrane placement area 12 is disposed at the upper end of the bottom plate 10 for placing the membrane sample, and the membrane sample is sealed at the upper end of the bottom plate 10 through a sealing ring 11 .

[0053] In addition, the diaphragm sample is in a disc shape or nearly in a disc shape, and the diameter of the diaphragm sample is 15-100 mm.

[0054] In some embodiments, a support plate 13 is disposed above the diaphragm placement 12 . The support plate 13 is a porous plate used to support the diaphragm sample to prevent the diaphragm sample from twisting and deforming, thereby improving the accuracy of the test.

[0055] In some embodiments, a liquid reservoir 15 is disposed above the support plate 13 .

[0056] The lower end of the liquid reservoir 15 is open, and the upper end of the liquid reservoir 15 is in the shape of an elongated tube. The liquid level sensor 3 is arranged at the upper end of the liquid reservoir 15, that is, the liquid level sensor 3 is arranged at the upper end of the liquid reservoir 15 in the shape of an elongated tube.

[0057] The liquid level sensor 3 is electrically connected to the control cabinet 5. When the gas begins to pass through the diaphragm sample and bubble in the liquid reservoir 15, the liquid level in the liquid reservoir 15 rises, and the liquid level sensor 3 transmits a liquid level change signal to the control cabinet 5. After receiving the liquid level change signal, the control cabinet 5 issues subsequent instructions.

[0058] In some embodiments, the bottom plate 10 and the liquid reservoir 15 are locked with a locking ring 14 to prevent the gas from escaping directly from other gaps without passing through the diaphragm sample.

[0059] The bubble point pressure is the critical pressure when the first bubble appears and guides continuous bubbling. The method for automatically testing the bubble point pressure of the diaphragm of the present invention comprises the following steps:

[0060] (1) placing the membrane sample in a liquid that can completely wet it, and installing it in a membrane holder after it is completely wetted;

[0061] (2) adding liquid capable of completely wetting the membrane sample from the upper end of the liquid reservoir 15;

[0062] (3) When the second solenoid valve 7 is closed, the pressure control valve 1 and the first solenoid valve 6 are opened;

[0063] (4) The pressure control valve 1 controls the gas pressure entering the diaphragm holder 2 to gradually increase. When the gas begins to pass through the diaphragm sample and bubble in the liquid reservoir 15, the liquid level in the liquid reservoir 15 rises, and the liquid level sensor 3 transmits a liquid level change signal to the control cabinet 5;

[0064] (5) After receiving the liquid level change signal, the control cabinet 5 issues a command to record the pressure value measured by the pressure sensor 4 at that moment, open the second solenoid valve 7, and close the first solenoid valve 6, and the test is completed.

[0065] In step (1), before the test begins, a liquid that completely soaks the diaphragm sample needs to be added to the liquid reservoir 15. The liquid can be ethanol or other suitable liquids. The liquid level in the liquid reservoir 15 needs to be within the measurable range of the liquid level sensor 3. Preferably, the liquid level in the liquid reservoir 15 is slightly higher than the lowest liquid level measurable by the liquid level sensor 3.

[0066] In step (2), when the second solenoid valve 7 is closed, the pressure control valve 1 and the first solenoid valve 6 are opened, so that the gas enters the membrane holder 2 through the first solenoid valve 6 .

[0067] Step (3) is specifically to adjust the gas pressure entering the membrane holder 2 from the gas inlet 9 during the test from small to large by the control cabinet 5 and the pressure control valve 1, and identify the moment when the gas starts to pass through the diaphragm sample by measuring the liquid level of the liquid level sensor 3. During the process of gradually increasing the gas pressure in the gas pipeline 8, the pressure sensor 4 records the change of the gas pressure. When the gas starts to pass through the diaphragm sample and bubbles in the liquid reservoir 15, the liquid level in the liquid reservoir 15 rises, and the liquid level sensor 3 transmits the liquid level change signal to the control cabinet 5.

[0068] In step (4), when the control cabinet 5 receives the liquid level change signal, it issues an instruction. Specifically, the control cabinet 5 issues an instruction to record the measurement value of the pressure sensor 4 at that moment. The measurement value is the bubble point pressure of the diaphragm sample. At the same time, the control cabinet 5 issues an instruction to open the second solenoid valve 7 and close the first solenoid valve 6, so that the gas no longer enters the membrane holder 2, but flows out through the second solenoid valve 7, and the test is completed.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for automatically testing the bubble point pressure of a diaphragm, characterized in that: include: Gas pipelines; A pressure control valve disposed at the front end of the gas pipeline; a pressure sensor disposed downstream of the pressure control valve; a first solenoid valve arranged in parallel with the pressure sensor; a second solenoid valve arranged in series with the pressure sensor, the second solenoid valve being arranged downstream of the pressure sensor; a membrane holder, the membrane holder being arranged in series downstream of the first solenoid valve, the membrane holder comprising a liquid reservoir; A liquid level sensor, the liquid level sensor being fixed to the upper end of the liquid reservoir; control cabinet, the pressure control valve, the pressure sensor, the liquid level sensor, the first solenoid valve and the second solenoid valve are all electrically connected to the control cabinet, The film holder also includes: Chassis; A gas inlet disposed at the lower end of the chassis; A membrane placement area for placing a membrane sample, wherein the membrane sample is sealed and arranged on the upper end of the bottom plate through a sealing ring; A support plate is arranged above the membrane placement location, the liquid reservoir is arranged above the support plate, and the support plate is a porous plate; A locking ring is used to lock the chassis and the liquid reservoir. The lower end of the liquid reservoir is open, and the upper end of the liquid reservoir is in the shape of an elongated tube.

2. The device according to claim 1, characterized in that The diameter of the diaphragm sample is 15-100 mm.

3. The device according to claim 1, characterized in that The gas in the gas pipeline is nitrogen or air.

4. The device according to claim 1, characterized in that The liquid reservoir is used to contain liquid that completely soaks the membrane sample.

5. The device according to claim 4, characterized in that The liquid is ethanol.

6. A method for automatically testing the bubble point pressure of a diaphragm, characterized in that: Using the device as described in any one of claims 1 to 5, comprising the following steps: (1) placing the membrane sample in a liquid that can completely wet it, and installing it in a membrane holder after it is completely wetted; (2) adding liquid from the upper end of the liquid reservoir that can completely wet the diaphragm sample; (3) When the second solenoid valve is closed, the pressure control valve and the first solenoid valve are opened; (4) The pressure control valve controls the gas pressure entering the diaphragm holder to gradually increase. When the gas begins to pass through the diaphragm sample and bubble in the liquid reservoir, the liquid level in the liquid reservoir rises, and the liquid level sensor transmits a liquid level change signal to the control cabinet; (5) After receiving the liquid level change signal, the control cabinet issues an instruction to record the pressure value measured by the pressure sensor at that moment, open the second solenoid valve, close the first solenoid valve, and the test is completed.

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