CN111240376B - Passive air pressure adjusting device - Google Patents
Passive air pressure adjusting device Download PDFInfo
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- CN111240376B CN111240376B CN201811446368.5A CN201811446368A CN111240376B CN 111240376 B CN111240376 B CN 111240376B CN 201811446368 A CN201811446368 A CN 201811446368A CN 111240376 B CN111240376 B CN 111240376B
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- air pressure
- water storage
- pressure
- hydrophilic
- passive air
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0633—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane characterised by the properties of the membrane
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a passive air pressure adjusting device, which seals the periphery of a hydrophilic porous membrane with a certain aperture by using rubber or glue, and a certain amount of water or sealing liquid is stored on one side of the membrane. If necessary, a support layer with large pore diameter is arranged on one side or two sides of the membrane to form an air pressure adjusting device with a hydrophilic porous membrane as a sealing surface. When the pressure on the low pressure side of the device is stable (e.g., ambient air pressure), the device can passively adjust the gas pressure on the high pressure side to reduce the pressure to near the minimum bubble pressure. The air pressure adjusting process has no extra energy consumption, is quiet, responds in time and is not influenced by gravity factors; by using porous membranes of different pore sizes and different hydrophilicity, different pressures can be achieved.
Description
Technical Field
The invention relates to a passive air pressure adjusting device, and belongs to the field of fuel cells.
Background
The fuel cell has the characteristics of high energy efficiency, high specific power, zero carbon emission and the like. During normal operation of the fuel cell, a certain amount of gas is continuously introduced into the water chamber of the fuel cell due to gas permeation and the like, and is accumulated in the water tank along with circulation. Normally, when the attitude is stable, this gas is discharged at the upper end of the tank through a solenoid valve. The electromagnetic valve can bring certain noise, needs to be matched with a pressure sensor for use, needs certain circuit control software, is slightly complicated in structure, and has higher requirement on the reliability of each part.
Disclosure of Invention
The invention designs a passive air pressure adjusting device by utilizing the characteristic that a hydrophilic microporous membrane has the minimum bubbling pressure when being wetted. The specific invention content is as follows:
the invention provides a passive air pressure adjusting device which is sequentially provided with a closed air inlet cavity, a hydrophilic micropore component and a water storage structure along the air exhaust direction; the gas inlet cavity is provided with a gas inlet and a gas outlet; the hydrophilic microporous component is sealed and fixed at the gas outlet; (ii) a The hydrophilic microporous component is at least one of a hydrophilic mixed fiber membrane, a polypropylene film, a polyether sulfone membrane, a glass fiber membrane or microporous graphite, microporous titanium and microporous stainless steel, and the aperture of the hydrophilic microporous component is between 0.02 and 5 mu m. Preferably, the pore size is uniform.
Further, the device also comprises a porous support layer which is connected between the hydrophilic microporous component and the water storage structure in a sealing manner.
Further, a sealing piece I is arranged at the edge of the hydrophilic microporous component facing the air inlet cavity; and a sealing piece II is arranged at the edge of the porous supporting layer facing the water storage structure.
Furthermore, the water storage structure is a sealed cavity, a water storage material is filled in the cavity, and an exhaust port is arranged at the tail end of the exhaust direction.
Further, the sealing element I and the sealing element II are made of sealant or silicon rubber.
Further, the porous support layer is a porous metal net or a plastic net with certain strength, such as a stainless steel net, a titanium foam, a copper net and the like, and the pore diameter of the porous metal net or the plastic net is within the range of 5um-2 mm.
Further, the water storage material is sponge, cotton or water storage gel.
The invention provides a method for operating a passive air pressure regulating device, wherein the interior of a water storage structure is low pressure, an air inlet cavity is high pressure, when the pressure difference is greater than the minimum bubbling pressure of a hydrophilic microporous component, the high pressure side exhausts air to the low pressure side, and when the pressure difference at the two sides is lower than the minimum bubbling pressure of the hydrophilic microporous component, water in the water storage structure automatically enters pores of the hydrophilic microporous component, so that the air exhausting process is stopped. The process can be repeated, so that the pressure difference between two sides of the hydrophilic microporous component is always kept near the minimum bubbling pressure of the microporous membrane.
The circulating water cavity of the fuel cell is provided with the passive air pressure regulating device.
The circulating water cavity is internally provided with a plurality of passive air pressure adjusting devices, and hydrophilic microporous components with different apertures and materials can be adopted to ensure that the devices have different pressure maintaining capacities; the regulating device can also be used in series to increase the sustainable gas pressure.
The invention relates to a passive air pressure adjusting device, which is characterized in that the periphery of a hydrophilic porous membrane with a certain pore diameter is sealed by rubber or glue, and a certain amount of water or sealing liquid is stored on one side of the membrane. If necessary, a support layer with large pore diameter is arranged on one side or two sides of the membrane to form an air pressure adjusting device with a hydrophilic porous membrane as a sealing surface. The porous hydrophilic membrane used has capillary forces, and when one end of the membrane is exposed to water, the membrane absorbs the water and there is a minimum bubbling pressure. When the air pressure difference between the two ends of the membrane is less than the minimum bubbling pressure, the membrane is air-tight, so that the pressure difference is maintained; when the air pressure difference at the two ends of the membrane is greater than the minimum bubbling pressure, the membrane leaks air, so that the pressure difference at the two sides of the membrane is reduced, and when the pressure difference is lower than the minimum bubbling pressure, water stored in the water storage material at one side of the membrane can be sucked into the pores of the membrane again to block the pores, so that the membrane does not leak air any more, and a certain pressure difference is maintained. When the pressure on the low pressure side of the device is stable (e.g., ambient air pressure), the device can passively adjust the gas pressure on the high pressure side to reduce the pressure to near the minimum bubble pressure. The air pressure adjusting process has no extra energy consumption, is quiet, responds in time, is not influenced by gravity factors, and is not sensitive to the direction; by using porous membranes of different pore sizes and different hydrophilicity, different pressures can be achieved.
Drawings
Fig. 1 is a schematic view of a passive air pressure regulating device.
In the figure, 1 is a high-pressure chamber, 2 is a sealing element I, 3 is a hydrophilic microporous membrane, 4 is a porous supporting layer, 5 is a sealing element II, 6 is a water storage material, and 7 is a gas interface.
Detailed Description
Example 1
A silicon rubber sealing ring (sealing element I) with the thickness of 0.5mm is placed on one side of a mixed fiber membrane with the aperture of 0.45 mu m and the thickness of 0.1mm serving as a hydrophilic microporous component (the minimum bubbling pressure is 0.12MPa), a stainless steel mesh (porous supporting layer) with the size of 200 meshes, a silicon rubber sealing ring (sealing element II) and sponge (water storage material) with water absorption are sequentially placed on the other side of the mixed fiber membrane, the whole structure is packaged on a flange which can be clamped, and a gas interface A (a gas inlet) and a gas interface B (a gas outlet) are arranged at two ends of the flange, so that the passive air pressure regulating device is obtained.
Connecting the port A of the device on a closed tank containing 0.15MPa of air, wherein the pressure of the closed tank is gradually reduced, and when the pressure is reduced to 0.1MPa, the pressure is not reduced any more and is stabilized at 0.1 MPa; and (4) inflating the tank to 0.2MPa again, starting deflation by the pressure regulating device, and stopping pressure reduction and stabilizing the pressure to 0.1MPa when the pressure in the closed tank is 0.1 MPa. The device is placed horizontally, vertically or in an inverted mode, and the effect is the same. The whole process is quiet and noiseless.
Claims (9)
1. A passive air pressure regulating device is characterized in that the device is sequentially provided with a closed air inlet cavity, a hydrophilic micropore component and a water storage structure along the air exhaust direction; the gas inlet cavity is provided with a gas inlet and a gas outlet; the hydrophilic microporous component is hermetically fixed at the gas outlet; the water storage structure is hermetically connected with the hydrophilic microporous component; the hydrophilic microporous component is at least one of a hydrophilic mixed fiber membrane, a polypropylene film, a polyether sulfone membrane, a glass fiber membrane or microporous graphite, microporous titanium and microporous stainless steel, and the aperture of the hydrophilic microporous component is between 0.02 and 5 mu m;
the interior of the water storage structure is low pressure, the air inlet cavity is high pressure, when the pressure difference is larger than the minimum bubbling pressure of the hydrophilic microporous component, the high pressure side exhausts air to the low pressure side, and when the pressure difference on the two sides is lower than the minimum bubbling pressure of the hydrophilic microporous component, water in the water storage structure automatically enters the pores of the hydrophilic microporous component, so that the air exhaust process is stopped.
2. The passive air pressure regulating device of claim 1, wherein: the device further comprises a porous support layer, and the porous support layer is connected between the hydrophilic microporous component and the water storage structure in a sealing mode.
3. The passive air pressure regulating device of claim 1, wherein:
a sealing element I is arranged at the edge of the hydrophilic microporous component facing the air inlet cavity;
and a sealing piece II is arranged at the edge of the porous supporting layer facing the water storage structure.
4. The passive air pressure regulating device of claim 1, wherein: the water storage structure is a sealed cavity, a water storage material is filled in the cavity, and an exhaust port is arranged at the tail end of the exhaust direction.
5. The passive air pressure regulating device of claim 3, wherein: the sealing element I and the sealing element II are made of sealant or silicon rubber.
6. The passive air pressure regulating device of claim 2, wherein: the porous supporting layer is a porous metal net or a plastic net with certain strength, such as a stainless steel net, a titanium foam, a copper net and the like, and the pore diameter of the porous metal net or the plastic net is within the range of 5um-2 mm.
7. The passive air pressure regulating device according to claim 4, wherein: the water storage material is sponge, cotton or water storage gel.
8. The fuel cell is characterized in that a circulating water cavity of the fuel cell is provided with the passive air pressure adjusting device.
9. The fuel cell of claim 8, wherein a plurality of said passive air pressure adjusting devices are arranged in said circulating water chamber; the passive air pressure adjusting devices are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446368.5A CN111240376B (en) | 2018-11-29 | 2018-11-29 | Passive air pressure adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446368.5A CN111240376B (en) | 2018-11-29 | 2018-11-29 | Passive air pressure adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111240376A CN111240376A (en) | 2020-06-05 |
| CN111240376B true CN111240376B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811446368.5A Active CN111240376B (en) | 2018-11-29 | 2018-11-29 | Passive air pressure adjusting device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295796A (en) * | 2007-04-25 | 2008-10-29 | 财团法人工业技术研究院 | Fuel cell system |
| CN102460790A (en) * | 2009-06-26 | 2012-05-16 | 日产自动车株式会社 | Gas diffusion electrode and production method for same, and membrane electrode assembly and production method for same |
| CN102804466A (en) * | 2009-06-26 | 2012-11-28 | 日产自动车株式会社 | Hydrophilic porous layer for fuel cells, gas diffusion electrode and manufacturing method thereof, and membrane electrode assembly |
| EP2996184A1 (en) * | 2014-09-09 | 2016-03-16 | Paul Scherrer Institut | A method to produce a gas diffusion layer and a fuel cell comprising a gas diffusion layer |
-
2018
- 2018-11-29 CN CN201811446368.5A patent/CN111240376B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295796A (en) * | 2007-04-25 | 2008-10-29 | 财团法人工业技术研究院 | Fuel cell system |
| CN102460790A (en) * | 2009-06-26 | 2012-05-16 | 日产自动车株式会社 | Gas diffusion electrode and production method for same, and membrane electrode assembly and production method for same |
| CN102804466A (en) * | 2009-06-26 | 2012-11-28 | 日产自动车株式会社 | Hydrophilic porous layer for fuel cells, gas diffusion electrode and manufacturing method thereof, and membrane electrode assembly |
| EP2996184A1 (en) * | 2014-09-09 | 2016-03-16 | Paul Scherrer Institut | A method to produce a gas diffusion layer and a fuel cell comprising a gas diffusion layer |
Non-Patent Citations (3)
| Title |
|---|
| 燃料电池的关键技术;侯明等;《科技导报》;20160331(第6期);第1、6页 * |
| 质子交换膜燃料电池膜电极结构研究;王晓丽;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20070215(第2期);正文第15-20页 * |
| 质子交换膜燃料电池阴极侧多孔扩散材料内两相传输特性;吴睿;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20130215(第2期);正文第1-19页 * |
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| CN111240376A (en) | 2020-06-05 |
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