CN115200772A - Pressure sensor and proton exchange membrane fuel cell system - Google Patents
Pressure sensor and proton exchange membrane fuel cell system Download PDFInfo
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- CN115200772A CN115200772A CN202210848662.9A CN202210848662A CN115200772A CN 115200772 A CN115200772 A CN 115200772A CN 202210848662 A CN202210848662 A CN 202210848662A CN 115200772 A CN115200772 A CN 115200772A
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- 239000000446 fuel Substances 0.000 title claims abstract description 31
- 239000012528 membrane Substances 0.000 title description 4
- 238000007710 freezing Methods 0.000 claims abstract description 36
- 230000008014 freezing Effects 0.000 claims abstract description 23
- 238000007731 hot pressing Methods 0.000 claims abstract description 18
- 230000002265 prevention Effects 0.000 claims abstract description 16
- 230000008054 signal transmission Effects 0.000 claims abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims 2
- 108010053481 Antifreeze Proteins Proteins 0.000 claims 1
- 230000002528 anti-freeze Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 28
- 238000000034 method Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 206010060904 Freezing phenomenon Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
- G01L9/125—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor with temperature compensating means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure sensor, which comprises a wiring harness terminal, a pressure sensing element and a low-temperature freezing prevention interface, wherein the wiring harness terminal is arranged at the first end of the pressure sensing element and is electrically connected with the pressure sensing element so as to realize power supply and pressure signal transmission of the pressure sensing element; the anti-low temperature freezing interface is arranged at the second end of the pressure sensing element and comprises a connecting part and a communicating cavity, the connecting part is used for being connected with the fuel cell system, the communicating cavity is communicated with the fuel cell system and the pressure sensing element, and the caliber of the communicating cavity is gradually increased from the direction far away from the hot pressing element. The caliber of the communicating cavity is gradually increased from the direction far away from the hot-pressing element, so that when the pressure sensor generates condensed water, the condensed water can slide along the cavity wall of the communicating cavity, and the phenomenon that the pressure sensor is frozen at low temperature can be reduced.
Description
Technical Field
The invention relates to the technical field of proton exchange membrane fuel cell systems, in particular to a pressure sensor and a proton exchange membrane fuel cell system.
Background
In a low-temperature environment of a fuel cell system, a pressure sensor in the system needs to monitor the pressure of an air medium containing water vapor and a hydrogen medium in real time. The existing sensor is shut down and stored at low temperature through the operation of a fuel cell system, condensed water drops can be formed at a sensor pipeline interface and inside the sensor, and after the condensed water drops are accumulated for a plurality of times, the surface of a pressure sensing element inside the pressure sensor can be frozen in a low-temperature environment, even irreversible damage is caused, so that the measurement precision of the pressure sensor is reduced or lost, and the system cannot operate.
Therefore, how to reduce the low temperature freezing phenomenon of the pressure sensor becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a pressure sensor, which is used for reducing the low-temperature freezing phenomenon of the pressure sensor.
In order to achieve the above purpose, the invention provides the following technical scheme:
a pressure sensor comprises a wiring harness terminal, a pressure sensing element and a low-temperature freezing prevention interface, wherein the wiring harness terminal is arranged at a first end of the pressure sensing element and is electrically connected with the pressure sensing element so as to realize power supply and pressure signal transmission of the pressure sensing element; the low-temperature freezing prevention interface is arranged at the second end of the pressure sensing element and comprises a connecting part and a communicating cavity, the connecting part is used for being connected with a fuel cell system, the communicating cavity is communicated with the fuel cell system and the pressure sensing element, and the caliber of the communicating cavity is gradually increased from the direction far away from the hot pressing element.
In some embodiments of the present invention, an included angle between a cavity wall of the communicating cavity and a center line of the communicating cavity is in a range of 25 ° to 45 °.
In some embodiments of the present invention, a first hydrophobic layer is disposed on a cavity wall of the communicating cavity.
In some embodiments of the present invention, a first seal is disposed between the anti-freezing interface and the pressure sensing element.
In some embodiments of the present invention, the anti-freezing interface is riveted to the pressure sensing element.
In some embodiments of the present invention, when the connecting portion penetrates through the integrated end plate of the fuel cell system, the relationship between the minimum inner diameter D of the pressure sensor, the maximum outer diameter D of the pressure sensor, and the height H of the pressure sensor satisfies: d = D/2, and H =2D.
In some embodiments of the present invention, when the connecting portion is embedded in an integrated end plate of the fuel cell system, the integrated end plate has a first pair of interfaces in butt joint with the communicating cavity, a cavity wall of the first pair of interfaces is smoothly connected with a cavity wall of the communicating cavity, and a diameter of a cavity wall of the first pair of interfaces gradually increases from a direction away from the hot pressing element.
In some embodiments of the present invention, a relationship between a height H ' of the pressure sensor relative to the lower end surface of the integrated end plate, a minimum inner diameter D ' of the pressure sensor, and a maximum inner diameter D ' of the first pair of ports satisfies: d '= D'/2, and H '=2D'.
In some embodiments of the present invention, the connection portion includes a threaded portion and a stepped portion sequentially arranged in the installation direction, wherein the stepped portion is used for providing the second sealing member, and the threaded portion is provided with a threaded structure and is connected with the integrated end plate of the fuel cell system through the threaded structure.
In some embodiments of the present invention, a second hydrophobic layer is disposed on a cavity wall of the first pair of interfaces.
In some embodiments of the present invention, when the connecting portion is connected to an upper end surface of an integrated end plate of the fuel cell system, the integrated end plate has a second pair of interfaces in butt joint with the communicating cavity, a cavity wall of the second pair of interfaces is smoothly connected with a cavity wall of the communicating cavity, and a caliber of the second pair of interfaces gradually increases from a direction away from the hot pressing element.
In some embodiments of the present invention, the relationship between the height H "of the pressure sensor relative to the lower end surface of the integrated end plate, the minimum inner diameter D" of the pressure sensor, and the maximum inner diameter D' of the second pair of interfaces satisfies: d "= D"/2, and H "=2D".
In some embodiments of the present invention, the connecting portion is a flange structure, a third sealing member is disposed between the connecting portion and the upper end surface of the integrated end plate, and the connecting portion is disposed on the upper end surface of the integrated end plate through a fastening member.
In some embodiments of the present invention, a third hydrophobic layer is disposed on a cavity wall of the second pair of interfaces.
In some embodiments of the present invention, the outer surface of the pressure sensing element is provided with a fourth hydrophobic layer.
In some embodiments of the present invention, a wire harness terminal includes a wire harness housing and a terminal portion provided in the wire harness housing to be electrically connected to a pressure sensitive member.
In some embodiments of the present invention, the harness housing is injection molded with the pressure sensitive member.
According to the technical scheme, in the pressure sensor, the caliber of the communicating cavity is gradually increased from the direction far away from the hot-pressing element, so that when the pressure sensor generates condensed water, the condensed water can slide along the cavity wall of the communicating cavity, and the phenomenon that the pressure sensor is frozen at a low temperature can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some examples or embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from the provided drawings without inventive effort, and that the invention can also be applied to other similar scenarios from the provided drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
FIG. 1 is a schematic diagram of a pressure sensor according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of another pressure sensor configuration provided by an example of the present invention;
FIG. 3 is a schematic diagram of a further pressure sensor according to an exemplary embodiment of the present invention;
wherein 100 is a wiring harness terminal, 200 is a pressure sensing element, 300 is a low temperature freezing prevention interface, and 400 is an integrated end plate;
101 is a harness housing, 102 is a terminal portion, 201 is a first seal, 301 is a communicating cavity, 302 is a connecting portion, 303 is a step portion, 304 is a second seal, 401 is a first pair of interfaces, and 402 is a second pair of interfaces.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The description of the background art shows that the surface of the pressure sensing element inside the pressure sensor can be frozen in a low-temperature environment, and even cause irreversible damage, so that the measurement accuracy of the pressure sensor is reduced or lost, and the system cannot operate. In the prior art, only low-temperature-resistant sensors are adopted in the method for preventing the pressure sensors from freezing at low temperature of the fuel cell, and the cost of the low-temperature-resistant pressure sensors is high. This is another problem to be solved by the present invention.
The invention provides a pressure sensor, which is used for reducing the low-temperature freezing phenomenon of the pressure sensor and reducing the cost of the pressure sensor. This is described in more detail below with reference to several embodiments.
Example one
Referring to fig. 1, the pressure sensor according to the example of the present invention includes a harness terminal 100, a pressure sensing element 200, and a low temperature freezing prevention interface 300, wherein the harness terminal 100 is disposed at a first end of the pressure sensing element 200 and electrically connected to the pressure sensing element 200, so as to implement power supply and pressure signal transmission of the pressure sensing element 200; the anti-low temperature freezing interface 300 is disposed at a second end of the pressure sensing element 200, the anti-low temperature freezing interface 300 includes a connecting portion 302 for connecting with a fuel cell system, and a communicating cavity 301 for communicating the fuel cell system and the pressure sensing element 200, and a caliber of the communicating cavity 301 gradually increases from a direction away from the hot pressing element.
As the caliber of the communicating cavity 301 is gradually increased from the direction far away from the hot-pressing element, when the pressure sensor generates condensed water, the condensed water can slide along the cavity wall of the communicating cavity 301 so as to be discharged, the condensed water is effectively prevented from being collected, the low-temperature freezing foundation is fundamentally damaged, and the low-temperature freezing phenomenon of the pressure sensor can be reduced. In addition, since the pressure sensor of the present invention discharges condensed water, the pressure sensing element 200 does not need to be a low temperature resistant pressure element, and the cost of the pressure sensor can be reduced in this respect.
The core of the invention is that the caliber of the communicating cavity 301 gradually increases from the direction far away from the hot-pressing element, and further, the included angle between the cavity wall of the communicating cavity 301 and the central line O of the communicating cavity 301 ranges from 25 degrees to 45 degrees. The included angle is controlled to be 25-45 degrees, so that the condensed water can slide down along the cavity wall of the communicating cavity 301 as soon as possible.
The whole communicating cavity 301 may be a polygonal pyramid structure, or may be a conical structure, that is, when the communicating cavity 301 is a polygonal pyramid structure, the cross section of the communicating cavity 301 may be a polygon; when the communication cavity 301 has a conical structure, the cross section of the communication cavity 301 may be circular.
In some examples of the present invention, when the connection portion 302 penetrates through the integrated end plate 400 of the fuel cell system, the condensed water discharge degree is mainly determined by the structural parameters of the communication cavity 301, and the relationship between the minimum inner diameter D of the pressure sensor, the maximum outer diameter D of the pressure sensor, and the height H of the pressure sensor satisfies: d = D/2, and H =2D. With this arrangement, water droplets can be prevented from adhering to the wall of the communicating chamber 301 due to surface tension.
To be further, a first hydrophobic layer is disposed on the wall of the communicating chamber 301. The first hydrophobic layer is made of a hydrophobic substance, and can be arranged on the wall of the communicating cavity 301 through a coating process diagram, and a structure with hydrophobic performance can be adhered on the wall of the communicating cavity 301 through an adhering process.
In some examples of the invention, a first seal 201 is disposed between the anti-freezing interface 300 and the pressure sensing element 200. The sealing performance between the anti-freezing interface 300 and the pressure sensing element 200 can be improved by arranging the first sealing member 201, so that the measurement accuracy of the pressure sensor is improved.
In some examples of the invention, the anti-freezing interface 300 is riveted to the pressure sensing element 200. The low-temperature freezing prevention interface 300 and the pressure sensing element 200 are integrated by adopting riveting connection, so that the sealing performance between the two is further improved, and the measurement accuracy of the pressure sensor is further improved.
Example two
Referring to fig. 2, the pressure sensor according to the example of the present invention includes a harness terminal 100, a pressure sensing element 200, and a low temperature freezing prevention interface 300, wherein the harness terminal 100 is disposed at a first end of the pressure sensing element 200 and electrically connected to the pressure sensing element 200, so as to implement power supply and pressure signal transmission of the pressure sensing element 200; the low temperature freezing prevention interface 300 is arranged at the second end of the pressure sensing element 200, the low temperature freezing prevention interface 300 comprises a connecting part 302 for connecting with a fuel cell system and a communicating cavity 301 for communicating the fuel cell system and the pressure sensing element 200, and the caliber of the communicating cavity 301 is gradually increased from the direction far away from the hot pressing element; when the connecting portion 302 is embedded into the integrated end plate 400 of the fuel cell system, the integrated end plate 400 has a first pair of interfaces 401 butted with the communicating cavity 301, the cavity walls of the first pair of interfaces 401 smoothly join with the cavity walls of the communicating cavity 301, and the diameters of the cavity walls of the first pair of interfaces 401 gradually increase from the direction away from the hot-pressing element.
As the calibers of the communicating cavity 301 and the first pair of interfaces 401 are gradually increased from the direction far away from the hot-pressing element, when the pressure sensor generates condensed water, the condensed water can slide along the cavity wall of the communicating cavity 301 and the cavity wall of the first pair of interfaces 401 to be discharged, the condensed water is effectively prevented from being collected, the low-temperature freezing base is fundamentally damaged, and the low-temperature freezing phenomenon of the pressure sensor can be reduced. In addition, since the pressure sensor of the present invention discharges condensed water, the pressure sensing element 200 does not need to be a pressure element that is resistant to low temperature, and thus the cost of the pressure sensor can be reduced.
In some examples of the invention, the relationship between the height H ' of the pressure sensor relative to the lower end face of the integrated end plate 400, the minimum inner diameter D ' of the pressure sensor, and the maximum inner diameter D ' of the first pair of ports 401 satisfies: d '= D'/2, and H '=2D'. With this arrangement, water droplets are prevented from adhering to the wall of the communication chamber 301 and the first pair of ports 401 due to surface tension.
When the communicating cavity 301 and the first pair of interfaces 401 are butted, the whole structure can be a polygonal pyramid structure, and the structure can also be a conical structure, that is, when the communicating cavity 301 and the first pair of interfaces 401 are polygonal pyramid structures, the sections of the communicating cavity 301 and the first pair of interfaces 401 can be polygons; when the communication cavity 301 and the first pair of ports 401 have a conical structure, the cross section of the communication cavity 301 and the first pair of ports 401 may be circular.
The core of the invention is that the caliber of the communicating cavity 301 is gradually increased from the direction far away from the hot pressing element, and further, the included angle between the cavity walls of the communicating cavity 301 and the first pair of interfaces 401 and the central line O of the communicating cavity 301 is in the range of 25-45 degrees. The included angle is controlled to be 25-45 degrees, so that the condensed water can slide down along the cavity wall of the communicating cavity 301 and the first pair of interfaces 401 as soon as possible.
To be further, a first hydrophobic layer is disposed on the wall of the communicating chamber 301. The first hydrophobic layer is processed by a hydrophobic substance, and can be arranged on the wall of the communicating cavity 301 through a coating process diagram, and a structure with hydrophobic property can be adhered on the wall of the communicating cavity 301 through an adhering process. A second hydrophobic layer is arranged on the cavity wall of the first pair of interfaces 401. The second hydrophobic layer is made of a hydrophobic material, and can be formed on the cavity wall of the first pair of interfaces 401 through a coating process, and a structure with hydrophobic performance can be attached to the cavity wall of the first pair of interfaces 401 through an attaching process.
In some embodiments of the present invention, the connection portion 302 includes a threaded portion and a stepped portion 303 sequentially arranged in the installation direction, wherein the stepped portion 303 is used for providing the second sealing member 304, and the threaded portion is provided with a threaded structure through which the connection portion is connected with the integrated end plate 400 of the fuel cell system.
In some examples of the invention, a first seal 201 is disposed between the anti-freezing interface 300 and the pressure sensing element 200. The sealing performance between the anti-freezing interface 300 and the pressure sensing element 200 can be improved by arranging the first sealing member 201, so that the measurement accuracy of the pressure sensor is improved.
In some examples of the invention, the anti-freezing interface 300 is riveted to the pressure sensing element 200. The low-temperature freezing prevention interface 300 and the pressure sensing element 200 are integrated by adopting riveting connection, so that the sealing performance between the two is further improved, and the measurement accuracy of the pressure sensor is further improved.
EXAMPLE III
Referring to fig. 3, the pressure sensor according to the example of the present invention includes a harness terminal 100, a pressure sensing element 200, and a low temperature freezing prevention interface 300, wherein the harness terminal 100 is disposed at a first end of the pressure sensing element 200 and electrically connected to the pressure sensing element 200, so as to implement power supply and pressure signal transmission of the pressure sensing element 200; the low temperature freezing prevention interface 300 is arranged at the second end of the pressure sensing element 200, the low temperature freezing prevention interface 300 comprises a connecting part 302 for connecting with a fuel cell system and a communicating cavity 301 for communicating the fuel cell system and the pressure sensing element 200, and the caliber of the communicating cavity 301 is gradually increased from the direction far away from the hot pressing element; when the connecting portion 302 is connected to the upper end surface of the integrated end plate 400 of the fuel cell system, the integrated end plate 400 has a second pair of interfaces 402 butted with the communicating cavity 301, the cavity walls of the second pair of interfaces 402 are smoothly joined with the cavity walls of the communicating cavity 301, and the aperture of the second pair of interfaces 402 gradually increases from the direction away from the hot-pressing element.
Because the calibers of the communicating cavity 301 and the second pair of interfaces 402 are gradually increased from the direction far away from the hot-pressing element, when the pressure sensor generates condensed water, the condensed water can slide along the cavity wall of the communicating cavity 301 and the cavity wall of the second pair of interfaces 402 to be discharged, the condensed water is effectively prevented from being collected, the low-temperature freezing base is fundamentally damaged, and the low-temperature freezing phenomenon of the pressure sensor can be reduced. In addition, since the pressure sensor of the present invention discharges condensed water, the pressure sensing element 200 does not need to be a pressure element that is resistant to low temperature, and thus the cost of the pressure sensor can be reduced.
In some examples of the invention, the relationship between the height H "of the pressure sensor relative to the lower end face of the integrated endplate 400, the minimum inner diameter D" of the pressure sensor, and the maximum inner diameter D' of the second pair of interfaces 402 is: d "= D"/2, and H "=2D". So configured, water droplets are prevented from adhering to the walls of the second pair of interfaces 402 due to surface tension.
When the communicating cavity 301 and the second pair of interfaces 402 are butted, the whole structure can be a polygonal pyramid structure, and the structure can also be a conical structure, that is, when the communicating cavity 301 and the second pair of interfaces 402 are polygonal pyramid structures, the sections of the communicating cavity 301 and the second pair of interfaces 402 can be polygons; when the communication cavity 301 and the second pair of ports 402 have a conical structure, the cross section of the communication cavity 301 and the second pair of ports 402 may be circular.
The core of the invention is that the caliber of the communicating cavity 301 gradually increases from the direction far away from the hot-pressing element, and further, the included angle between the cavity walls of the communicating cavity 301 and the second pair of interfaces 402 and the central line O of the communicating cavity 301 ranges from 25 degrees to 45 degrees. The included angle is controlled to be 25-45 degrees, so that the condensed water can slide down along the cavity wall of the communicating cavity 301 and the second pair of interfaces 402 as soon as possible.
To be further, a first hydrophobic layer is disposed on the wall of the communicating chamber 301. The first hydrophobic layer is processed by a hydrophobic substance, and can be arranged on the wall of the communicating cavity 301 through a coating process diagram, and a structure with hydrophobic property can be adhered on the wall of the communicating cavity 301 through an adhering process. A third hydrophobic layer is disposed on the cavity wall of the second pair of interfaces 402. The third hydrophobic layer is made of a hydrophobic material, and can be attached to the cavity wall of the second pair of interfaces 402 by a coating process or by a pasting process.
Since the anti-freezing interface 300 is disposed on the upper end surface of the integrated end plate 400 through the connecting portion 302, the connecting portion 302 is, but not limited to, a flange structure, a third sealing member is disposed between the connecting portion 302 and the upper end surface of the integrated end plate 400, and the connecting portion 302 is disposed on the upper end surface of the integrated end plate 400 through a fastening member.
In some examples of the invention, a first seal 201 is disposed between the anti-freezing interface 300 and the pressure sensing element 200. The sealing performance between the anti-freezing interface 300 and the pressure sensing element 200 can be improved by arranging the first sealing member 201, so that the measurement accuracy of the pressure sensor is improved.
In some examples of the invention, the anti-freezing interface 300 is riveted to the pressure sensing element 200. The low temperature freezing prevention interface 300 and the pressure sensing element 200 are integrated by adopting riveting connection, so that the sealing performance between the two is further improved, and the measurement precision of the pressure sensor is further improved.
On the basis of the first, second, and third embodiments, the outer surface of the pressure sensing element 200 is provided with a fourth hydrophobic layer. By arranging the fourth hydrophobic layer, the condensed water on the outer surface of the pressure sensing element 200 can be discharged as soon as possible, so that the collection of the condensed water can be reduced.
The harness terminal 100 electrically functions as a power supply and pressure signal output interface for the pressure sensing element 200; the mechanical function is to mate the harness termination insert with the harness terminal 100. The connection of the harness terminal 100 and the pressure sensitive member 200 may be variously changed, and the harness terminal 100 may be mounted on the pressure sensitive member 200 and the pressure sensitive member 200 may be mounted on the harness terminal 100. In some examples of the present invention, the wire harness terminal 100 includes a wire harness housing 101 and a terminal portion 102 provided in the wire harness housing 101 to be electrically connected to the pressure sensitive element 200. Wherein, the wire harness housing 101 is connected with the pressure sensing element 200 by injection molding.
The pressure sensing element 200 is an electrical core component of the pressure sensor, and functions to convert the pressure applied to the surface of the ceramic pressure sensing element into the plastic deformation of the ceramic sheet, so as to cause the change of capacitance parameters inside the ceramic pressure sensing element, and convert the measured medium pressure value into a corresponding electrical signal through a measuring circuit inside the sensor.
It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
It should be understood that "system", "apparatus", "unit" and/or "module" as used herein is a method for distinguishing different components, elements, parts or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.
As used in this disclosure and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements. An element defined by the phrase "comprising a component of ' 8230 ' \8230; ' does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
Wherein in the description of the embodiments of the invention, "/" indicates an OR meaning, for example, A/B may indicate A or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present invention, "a plurality" means two or more than two.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Flow charts are used in the present invention to illustrate the operations performed by a system according to embodiments of the present invention. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the various steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and the technical principles applied, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. The scope of the present invention is not limited to the specific combinations of the above-described features, and may also include other features formed by arbitrary combinations of the above-described features or their equivalents without departing from the spirit of the present invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (17)
1. The pressure sensor is characterized by comprising a wiring harness terminal, a pressure sensing element and a low-temperature freezing prevention interface, wherein the wiring harness terminal is arranged at a first end of the pressure sensing element and is electrically connected with the pressure sensing element so as to realize power supply and pressure signal transmission of the pressure sensing element; the low-temperature freezing prevention interface is arranged at the second end of the pressure sensing element and comprises a connecting part and a communicating cavity, the connecting part is used for being connected with the fuel cell system, the communicating cavity is communicated with the fuel cell system and the pressure sensing element, and the caliber of the communicating cavity is gradually increased from the direction far away from the hot-pressing element.
2. The pressure sensor of claim 1, wherein the angle between the chamber wall of the communicating chamber and the centerline of the communicating chamber is in the range of 25 ° to 45 °.
3. A pressure sensor as claimed in claim 2, characterized in that a first hydrophobic layer is arranged on the wall of the communication chamber.
4. The pressure sensor of claim 3, wherein a first seal is disposed between the anti-freezing interface and the pressure sensing element.
5. The pressure sensor of claim 4, wherein the anti-freeze interface is riveted to the pressure sensing element.
6. The pressure sensor according to claim 1, wherein a relationship between a minimum inner diameter D of the pressure sensor, a maximum inner diameter D of the pressure sensor, and a height H of the pressure sensor when the connecting portion penetrates through an integrated end plate of the fuel cell system satisfies: d = D/2, and H =2D.
7. The pressure sensor according to claim 1, wherein when the connecting portion is inserted into an integrated end plate of the fuel cell system, the integrated end plate has a first pair of interfaces that interface with the communicating cavity, the cavity walls of the first pair of interfaces smoothly engage with the cavity walls of the communicating cavity, and the cavity walls of the first pair of interfaces have gradually increasing diameters from a direction away from the thermo-compression element.
8. The pressure sensor of claim 7, wherein the relationship between the height H ' of the pressure sensor relative to the lower end face of the integrated endplate, the minimum inner diameter D ' of the pressure sensor, and the maximum inner diameter D ' of the first pair of ports satisfies: d '= D'/2, and H '=2D'.
9. The pressure sensor according to claim 8, wherein the connecting portion includes a threaded portion and a stepped portion arranged in this order in the mounting direction, wherein the stepped portion is used to provide the second seal member, and the threaded portion is provided with a threaded structure by which to connect with an integrated end plate of the fuel cell system.
10. The pressure sensor of claim 7, wherein a second hydrophobic layer is disposed on a wall of the first pair of ports.
11. The pressure sensor according to claim 1, wherein when the connecting portion is connected to an upper end face of an integrated end plate of the fuel cell system, the integrated end plate has a second pair of interfaces which are butted with the communicating cavity, a cavity wall of the second pair of interfaces is smoothly joined with a cavity wall of the communicating cavity, and a caliber of the second pair of interfaces gradually increases from a direction away from the thermo-compression element.
12. The pressure sensor of claim 11, wherein the relationship between the height H "of the pressure sensor relative to the lower end face of the integrated endplate, the minimum inner diameter D" of the pressure sensor, and the maximum inner diameter D' of the second pair of ports satisfies: d "= D"/2, and H "=2D".
13. The pressure sensor of claim 11, wherein the connecting portion is a flange structure, a third sealing member is disposed between the connecting portion and the upper end surface of the integrated end plate, and the connecting portion is disposed on the upper end surface of the integrated end plate by a fastening member.
14. The pressure sensor of claim 11, wherein a third hydrophobic layer is disposed on a wall of the second pair of ports.
15. A pressure sensor as claimed in any one of claims 1 to 14, wherein an outer surface of the pressure sensing element is provided with a fourth hydrophobic layer.
16. The pressure sensor according to any one of claims 1 to 14, wherein the harness terminal includes a harness housing and a terminal portion provided in the harness housing to be electrically connected to the pressure-sensitive element.
17. The pressure sensor of claim 16, wherein the harness housing is injection molded with the pressure sensing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210848662.9A CN115200772A (en) | 2022-07-19 | 2022-07-19 | Pressure sensor and proton exchange membrane fuel cell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210848662.9A CN115200772A (en) | 2022-07-19 | 2022-07-19 | Pressure sensor and proton exchange membrane fuel cell system |
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| Publication Number | Publication Date |
|---|---|
| CN115200772A true CN115200772A (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210848662.9A Pending CN115200772A (en) | 2022-07-19 | 2022-07-19 | Pressure sensor and proton exchange membrane fuel cell system |
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| Country | Link |
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| CN (1) | CN115200772A (en) |
Citations (6)
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|---|---|---|---|---|
| EP0130448A2 (en) * | 1983-06-29 | 1985-01-09 | VEB Hochvakuum Dresden | Process and device for protecting measuring units and other sensitive elements against pollution and corrosion |
| JP2005140779A (en) * | 2003-11-03 | 2005-06-02 | Texas Instruments Inc | Capacitive pressure transducer |
| US20120067131A1 (en) * | 2009-05-11 | 2012-03-22 | Thomas Moelkner | High pressure sensor |
| CN206103382U (en) * | 2016-10-10 | 2017-04-19 | 北京合众思流体技术有限公司 | Rapid condensation mvr sewage treatment plant |
| CN207775182U (en) * | 2017-12-18 | 2018-08-28 | 江西龙橙果业有限公司 | A kind of orange oil distillation processing concentrator |
| JP2019128182A (en) * | 2018-01-22 | 2019-08-01 | 株式会社Ｓｏｋｅｎ | Gas characteristic detection device, and fuel cell system |
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2022
- 2022-07-19 CN CN202210848662.9A patent/CN115200772A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0130448A2 (en) * | 1983-06-29 | 1985-01-09 | VEB Hochvakuum Dresden | Process and device for protecting measuring units and other sensitive elements against pollution and corrosion |
| JP2005140779A (en) * | 2003-11-03 | 2005-06-02 | Texas Instruments Inc | Capacitive pressure transducer |
| US20120067131A1 (en) * | 2009-05-11 | 2012-03-22 | Thomas Moelkner | High pressure sensor |
| CN206103382U (en) * | 2016-10-10 | 2017-04-19 | 北京合众思流体技术有限公司 | Rapid condensation mvr sewage treatment plant |
| CN207775182U (en) * | 2017-12-18 | 2018-08-28 | 江西龙橙果业有限公司 | A kind of orange oil distillation processing concentrator |
| JP2019128182A (en) * | 2018-01-22 | 2019-08-01 | 株式会社Ｓｏｋｅｎ | Gas characteristic detection device, and fuel cell system |
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