CN209182473U - The pressure Distribution Test system of fuel cell - Google Patents
The pressure Distribution Test system of fuel cell Download PDFInfo
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- CN209182473U CN209182473U CN201821631883.6U CN201821631883U CN209182473U CN 209182473 U CN209182473 U CN 209182473U CN 201821631883 U CN201821631883 U CN 201821631883U CN 209182473 U CN209182473 U CN 209182473U
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- pressure
- fuel cell
- fixture
- test system
- pressure distribution
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Abstract
The utility model discloses a kind of pressure Distribution Test systems of fuel cell, the pressure Distribution Test system of the fuel cell includes: clamping device, the clamping device includes the first fixture, the second fixture and pressure-sensitive paper, first fixture is transparent component, second fixture is oppositely arranged with first fixture, and for clamping fuel cell test specimen to be tested, the pressure-sensitive paper is mounted on the side towards second fixture of first fixture, and the pressure-sensitive paper is for compressing fuel cell test specimen to be tested；Scanner, the scanner are installed on the side away from second fixture of first fixture, and the scanner is for scanning the pressure-sensitive paper.The pressure Distribution Test system of the utility model, can be with the pressure distribution situation of on-line analysis fuel cell, and in detection process, and repeated detection may be implemented in the assembly of single, and the testing efficiency of the pressure distribution of fuel cell is high.
Description
Technical field
The utility model belongs to fuel cell manufacturing technology field, in particular to a kind of pressure point of fuel cell
Cloth test macro.
Background technique
In recent years, Hydrogen Energy has received widespread attention as clean energy resource, and Hydrogen Energy industry has obtained energetically in many countries
Support and development.Hydrogen Energy product is gradually strided forward to the marketization.
Fuel cell is a kind of power generator that the chemical energy of hydrogen is changed into electric energy, with pollution-free, operating temperature
Low, low noise advantages are widely used in various fields.Fuel cell has been opened as a kind of clean energy products
A brand-new energy utilization patterns are opened up.
The determination of fuel cell pressure distribution is all one of most important link in fuel cell industrial chain all the time, pressure
Power distribution directly affects the performances such as sealing, resistance, diffusion, the service life of fuel cell.Numerous manufacturers and research institution are also at this
Field, which has been done, in depth to be studied.
In the related technology, the pressure distribution tests of fuel cell are difficult to comprehensively realize the pressure distribution of each region and pressure
Power is adjusted, and test result is difficult to analyze, and needs being dismounted for multiple times battery, can not purposefully be had according to test result after the completion of test
Pressure distribution is pointedly adjusted, causes fuel cell pressure distribution to be fixed time really longer, there are rooms for improvement.
Utility model content
The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model mentions
The pressure Distribution Test system of the pressure Distribution Test system of a kind of fuel cell out, the fuel cell can be fired with on-line analysis
Expect the pressure distribution situation of battery.
According to the pressure Distribution Test system of the fuel cell of the utility model embodiment, comprising: clamping device, the folder
Hold device include the first fixture, the second fixture and pressure-sensitive paper, first fixture be transparent component, second fixture with it is described
First fixture is oppositely arranged, and for clamping fuel cell test specimen to be tested, the pressure-sensitive paper is mounted on first fixture
The side towards second fixture, the pressure-sensitive paper is for compressing fuel cell test specimen to be tested；Scanner, it is described to sweep
The side away from second fixture that instrument is installed on first fixture is retouched, the scanner is for scanning the pressure-sensitive paper.
According to the pressure Distribution Test system of the utility model embodiment, can be distributed with the pressure of on-line analysis fuel cell
Situation, and in detection process, repeated detection may be implemented in the assembly of single, and the testing efficiency of the pressure distribution of fuel cell is high.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, further includes: processor, institute
Scanner and the processor communication connection are stated, the clamping device is equipped with the pressure monitoring device for monitoring clamp pressure,
The pressure monitoring device and the processor communication connection.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the processor includes depositing
The computer readable storage medium of the first computer program is contained, first computer program makes the processor pass through analysis
The information of the scanner output is to realize pressure distributional analysis, and realizes the processor by the pressure monitoring device
The pressure of monitoring is corresponding with the pressure distribution that the pressure-sensitive paper is tested.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the processor includes depositing
The computer readable storage medium of second computer program is contained, the second computer program makes the processor realize data
Acquisition.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the processor includes depositing
The computer readable storage medium of third computer program is contained, the third computer program makes the processor realize data
Display.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the clamping device includes
Multiple threaded fasteners for being used to connect first fixture and second fixture, multiple threaded fasteners, which are spaced apart, to be divided
For cloth so that the clamp pressure everywhere in the clamping device is adjustable, the pressure monitoring device includes multiple and the screw threads for fastening
The pressure sensor that part is arranged in a one-to-one correspondence.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the threaded fastener packet
Screw bolt and nut, the first fixture described in the bolt-through and second fixture are included, the pressure sensor is is set in
State the pad pressure sensor on bolt.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the pressure monitoring device
Including signal amplifier, data collecting card, chucking power for detecting the clamping device pressure sensor, the pressure passes
The input terminal communication connection of sensor and the signal amplifier, the output end of the signal amplifier and the data collecting card
Input terminal communication connection, the output end of the data collecting card and the processor communication connection.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the signal amplifier
Output electric current is I, and the pressure of the pressure sensor detection is P, is met: 4mA≤I≤20mA, 0kN≤P≤100kN.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the data collecting card packet
Number containing multiple signal paths, and the signal path of the data collecting card is no less than the number of the pressure sensor.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the fuel to be tested
Battery test specimen includes at least one of monolithic battery, multi-disc battery, battery component.
According to the pressure Distribution Test system of the fuel cell of the utility model one embodiment, the grade of the pressure-sensitive paper
For LW LLW one of LLLW.
The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 is the structural schematic diagram according to the pressure Distribution Test system of the utility model embodiment；
Fig. 2 is the explosive view according to the gripping apparatus grips fuel cell test specimen of the utility model embodiment；
Fig. 3 is the flow chart according to the pressure distribution test method of the fuel cell of the utility model embodiment.
Appended drawing reference:
Clamping device 1, scanner 2, signal amplifier 3, data collecting card 4, processor 5, bolt 6, pressure sensor 7,
First fixture 8, pressure-sensitive paper 9, fuel cell test specimen 10, the second fixture 11, nut 12.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable
The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure
Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model
System.In addition, defining " first ", the feature of " second " can explicitly or implicitly include one or more of the features.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
It describes below with reference to Fig. 1-Fig. 2 according to the utility model embodiment
As shown in Figure 1, including: folder according to the pressure Distribution Test system of the fuel cell of the utility model one embodiment
Hold device 1 and scanner 2.
Wherein, as shown in Fig. 2, clamping device 1 is for clamping fuel cell test specimen 10 to be tested, clamping device 1 includes
First fixture 8, the second fixture 11 and pressure-sensitive paper 9.First fixture 8 and the second fixture 11 can be plate body, the second fixture 11 with
First fixture 8 is oppositely arranged, and the first fixture 8, the second fixture 11 are for clamping fuel cell test specimen 10 to be tested.Second fixture
11 and first fixture 8 can be clamped in the first fixture 8, for the plate body of face setting, fuel cell test specimen 10 to be tested
Between two fixtures 11, pressure-sensitive paper 9 is mounted on the side of the second fixture 11 of direction of the first fixture 8, and pressure-sensitive paper 9 is to be measured for compressing
The fuel cell test specimen 10 of examination.
Fuel cell test specimen 10 to be tested includes one of monolithic battery, multi-disc battery, battery component.For example, to
The fuel cell test specimen 10 of test include battery component when, fuel cell test specimen 10 to be tested can for MEA (membrane electrode,
Membrane electrode assembly) or bipolar plates etc..
First fixture 8 is transparent component, and in some embodiments, the first fixture 8 is plate body made of transparent material, such as
Transparent glass reinforced plastic etc..Pressure-sensitive paper 9 and 10 face of fuel cell test specimen to be tested are arranged, and scanner 2 is installed on the first fixture 8
The side away from the second fixture 11, for example the first fixture 8 is lower fixture, and scanner 2 is installed on the lower section of the first fixture 8, sweeps
Instrument 2 is retouched for scanning pressure-sensitive paper 9.
It is understood that in the work of pressure Distribution Test system, by the first fixture 8, pressure-sensitive paper 9, combustion to be tested
Material battery test specimen 10, the second fixture 11 are sequentially stacked, and with initial pretightening force compression clamping device 1, pressure-sensitive paper 9 can be sent out after being pressurized
Change color, and to reflect the pressure distribution situation of fuel cell test specimen 10, and scanner 2 is directed through the first transparent fixture 8 i.e.
Pressure-sensitive paper 9 can be scanned, without dismantling the clamping device 1 and fuel cell test specimen 10 that are press fit together.If testing result shows to press
Power is insufficient, can also continue to load, pressure-sensitive paper 9 is reusable.
The grade of pressure-sensitive paper 9 be LW LLW one of LLLW, the grade of pressure-sensitive paper 9 can be chosen according to measuring accuracy.
According to the pressure Distribution Test system of the utility model embodiment, can be distributed with the pressure of on-line analysis fuel cell
Situation, and in detection process, repeated detection may be implemented in the assembly of single, and the testing efficiency of the pressure distribution of fuel cell is high.
In some embodiments, as shown in Figure 1, the pressure Distribution Test system of fuel cell can also include: processor
5, scanner 2 and 5 communication connection of processor, such as scanner 2 are electrically connected with processor 5 by cable, and clamping device 1 is equipped with use
In the pressure monitoring device of monitoring clamp pressure, pressure monitoring device and 5 communication connection of processor, such as pressure monitoring device with
Processor 5 is electrically connected by cable.
In this way, the pressure distribution situation that processor 5 receives the clamp pressure of clamping device 1 and pressure-sensitive paper 9 is measured, it can
To correspond pressure distribution situation and clamp pressure, when pressure distribution situation meets regulation, and fuel cell test specimen 10
Performance when meeting the requirements, record clamp pressure, can be according to the clamp pressure assembling fuel cell.
Processor 5 includes the computer readable storage medium for being stored with the first computer program, and the first computer program makes
The information that processor 5 is exported by analysis scanner 2 is to realize pressure distributional analysis, and supervises the realization of processor 5 by pressure
The pressure for surveying device monitoring is corresponding with the pressure distribution that pressure-sensitive paper 9 is tested.
Processor 5 includes the computer readable storage medium for being stored with second computer program, and second computer program makes
Processor 5 realizes data acquisition.In this way, processor 5 can acquire clamp pressure data.
Processor 5 includes the computer readable storage medium for being stored with third computer program, and third computer program makes
Processor 5 realizes that data are shown.It should be noted that pressure Distribution Test system may include display terminal, processor 5 and aobvious
Show that terminal called connects, display terminal can be with the processing result of video-stream processor 5.In some embodiments, processor 5 and display
Terminal can be respectively main frame and computer display.
In some embodiments, as shown in Figure 1, pressure monitoring device includes signal amplifier 3, data collecting card 4, pressure
Sensor 7, pressure sensor 7 are used to detect the chucking power of clamping device 1, the input terminal of pressure sensor 7 and signal amplifier 3
Communication connection, the output end of signal amplifier 3 and the input terminal communication connection of data collecting card 4, the output end of data collecting card 4
With 5 communication connection of processor, for example, pressure sensor 7 is electrically connected with the input terminal of signal amplifier 3 by cable, signal is put
The output end of big device 3 is electrically connected with the input terminal of data collecting card 4 by cable, the output end and processor 5 of data collecting card 4
It is electrically connected by cable.
The signal that signal amplifier 3 is used to export pressure sensor 7 amplifies, in order to data acquisition, data collecting card 4
Pass through the amplified data of signal amplifier 3 for acquiring.The output electric current of signal amplifier 3 is I, and pressure sensor 7 detects
Pressure be P, meet: 4mA≤I≤20mA, 0kN≤P≤100kN.The pressure and signal amplifier 3 that pressure sensor 7 detects
The electric current of output is positively correlated.
Data collecting card 4 includes multiple signal paths, and the number of the signal path of data collecting card 4 is no less than pressure biography
The number of sensor 7.The data that each pressure sensor 7 detects are collected in a signal path.For example pressure sensor 7 is
12, data collecting card 4 includes 20 signal paths.
As shown in Fig. 2, clamping device 1 includes multiple for connecting the threaded fastener of the first fixture 8 and the second fixture 11,
Multiple threaded fasteners, which are spaced apart, to be distributed so that the clamp pressure everywhere in clamping device 1 is adjustable, and pressure monitoring device includes more
A pressure sensor 7 being arranged in a one-to-one correspondence with threaded fastener.Threaded fastener can be along fuel cell test specimen to be tested
10 periphery is circumferentially distributed.
It should be noted that the arrangement of threaded fastener needs to refer to fuel cell test specimen 10 in actual assembled process
In arrangement, the arrangement of threaded fastener and position can be with fuel cell test specimens 10 during actual assembled
Arrangement is identical with position.For example fuel cell test specimen 10 can be rectangle, threaded fastener can be 12,2 spiral shells
Line fastener is arranged in the outside of the broadside of fuel cell test specimen 10, and the outside of the long side of fuel cell test specimen 10 is each uniformly distributed
5 threaded fasteners.
During the test, it is distributed by analyzing the pressure of the display of pressure-sensitive paper 9, it, can be with when the insufficient pressure in somewhere
The pressure at this is pointedly individually adjusted, until pressure distribution is met the requirements, and the performance satisfaction of fuel cell test specimen 10 is wanted
It asks.
As shown in Fig. 2, threaded fastener includes bolt 6 and nut 12, bolt 6 runs through the first fixture 8 and the second fixture 11,
Pressure sensor 7 is the pad pressure sensor being set on bolt 6.In this way, adjust pressure everywhere with can be convenient, and
Easily monitor pressure everywhere.Bolt 6 can be M12 high-strength bolt, totally 12, pad pressure sensor through-hole diameter
13mm, outer diameter 35mm can bear maximum pressure 100kN.
The application method of pressure Distribution Test system includes the following steps: pressure-sensitive paper 9 and fuel cell examination to be tested
Part 10 is mounted between the first fixture 8 and the second fixture 11；Apply pretightning force to threaded fastener；Test pressure distribution situation and
10 performance of fuel cell test specimen；If test result is met the requirements, the pretightning force of threaded fastener is recorded；If test result is discontented
Foot requires, then the pretightning force for adjusting threaded fastener retests.
It is understood that after by the assembly band clamping device of fuel cell test specimen 10 to be tested, in addition to monitoring is pressed
Power distribution is outer, can also be tested for the property, including the performance tests such as resistance, sealing, when fuel cell test specimen 10 performance with
When pressure is distributed while meeting the requirements, just assert that test result is met the requirements.
If test result is unsatisfactory for requiring, for example the pressure of some regions is smaller, it may not be necessary to dismantle clamping device, directly
Corresponding nut 12 is tightened, until test result is met the requirements.That is, pressure-sensitive paper 9 is during pressure is gradually increasing, it can
To be used for multiple times.
Step to threaded fastener apply pretightning force include: using torque spanner give threaded fastener apply pretightning force, and
The application step of pretightning force includes: that 0Nm-2Nm stepping is 0.15Nm-0.25Nm；2Nm-5Nm stepping is
0.4N·m-0.6N·m；Stepping is 0.8Nm-1.2Nm after 5Nm.
It is 0.2Nm that the application step of pretightning force, which includes: 0Nm-2Nm stepping, in some embodiments；2N·m-
5Nm stepping is 0.5Nm；Stepping is 1Nm after 5Nm.Using the stepping tightening way in above range, can prevent
In single rundown process, the pretightning force of application is excessive, and the pressure for ensuring that pressure-sensitive paper 9 is subject to as far as possible is gradually increasing, so that pressure-sensitive
Paper 9 can be used for multiple times.
As shown in figure 3, fuel cell test specimen to be tested is determined, according to bolt 6, pad pressure sensor, the first fixture
8, the sequence assembling of pressure-sensitive paper 9, fuel cell test specimen 10, the second fixture 11, nut 12；Applied using torque spanner to bolt 6
Initial pretightening force；It tests battery performance and pressure distribution situation, battery performance mainly includes air-tightness, resistance value, flow resistance and stream
Amount；If test result is unsatisfactory for given requirements, 6 pretightning force of adjustment bolt repeats above-mentioned work；If test result is met the requirements,
Data are recorded, it is data that power that essential record torque spanner applies, pad pressure sensor are shown, 9 data of pressure-sensitive paper, airtight
Property, flow resistance, flow, resistance etc..The application step of 6 pretightning force of bolt is that 0Nm-2Nm stepping is 0.2Nm；2N·m-
5Nm stepping is 0.5Nm；Stepping is 1Nm after 5Nm.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art
The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or
Person's feature can be combined in any suitable manner in any one or more of the embodiments or examples.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that:
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective
And modification, the scope of the utility model are defined by the claims and their equivalents.
Claims (12)
1. a kind of pressure Distribution Test system of fuel cell characterized by comprising
Clamping device, the clamping device include the first fixture, the second fixture and pressure-sensitive paper, and first fixture is hyalomere
Part, second fixture are oppositely arranged with first fixture, and for clamping fuel cell test specimen to be tested, the pressure-sensitive
Paper is mounted on the side towards second fixture of first fixture, and the pressure-sensitive paper is used to compress fuel electricity to be tested
Pond test specimen；
Scanner, the scanner are installed on the side away from second fixture of first fixture, and the scanner is used
In the scanning pressure-sensitive paper.
2. the pressure Distribution Test system of fuel cell according to claim 1, which is characterized in that further include:
Processor, the scanner and the processor communication connection, the clamping device are equipped with for monitoring clamp pressure
Pressure monitoring device, the pressure monitoring device and the processor communication connection.
3. the pressure Distribution Test system of fuel cell according to claim 2, which is characterized in that the processor includes
It is stored with the computer readable storage medium of the first computer program, first computer program makes the processor by dividing
The information of the scanner output is analysed to realize pressure distributional analysis, and fills the processor realization by the pressure monitoring
The pressure for setting monitoring is corresponding with the pressure distribution that the pressure-sensitive paper is tested.
4. the pressure Distribution Test system of fuel cell according to claim 3, which is characterized in that the processor includes
It is stored with the computer readable storage medium of second computer program, the second computer program makes the processor realize number
According to acquisition.
5. the pressure Distribution Test system of fuel cell according to claim 4, which is characterized in that the processor includes
It is stored with the computer readable storage medium of third computer program, the third computer program makes the processor realize number
According to display.
6. the pressure Distribution Test system of fuel cell according to claim 2, which is characterized in that the clamping device packet
Multiple threaded fasteners for being used to connect first fixture and second fixture are included, multiple threaded fasteners are spaced apart
So that the clamp pressure everywhere in the clamping device is adjustable, the pressure monitoring device includes multiple tight with the screw thread for distribution
The pressure sensor that firmware is arranged in a one-to-one correspondence.
7. the pressure Distribution Test system of fuel cell according to claim 6, which is characterized in that the threaded fastener
Including screw bolt and nut, the first fixture described in the bolt-through and second fixture, the pressure sensor are to be set in
Pad pressure sensor on the bolt.
8. the pressure Distribution Test system of fuel cell according to claim 2, which is characterized in that the pressure monitoring dress
Set including signal amplifier, data collecting card, chucking power for detecting the clamping device pressure sensor, the pressure
The input terminal communication connection of sensor and the signal amplifier, the output end of the signal amplifier and the data collecting card
Input terminal communication connection, the output end of the data collecting card and the processor communication connection.
9. the pressure Distribution Test system of fuel cell according to claim 8, which is characterized in that the signal amplifier
Output electric current be I, the pressure of pressure sensor detection is P, is met: 4mA≤I≤20mA, 0kN≤P≤100kN.
10. the pressure Distribution Test system of fuel cell according to claim 8, which is characterized in that the data acquisition
Card includes multiple signal paths, and the number of the signal path of the data collecting card is no less than the number of the pressure sensor
Mesh.
11. the pressure Distribution Test system of fuel cell according to claim 1 to 10, which is characterized in that
The fuel cell test specimen of test includes one of monolithic battery, multi-disc battery, battery component.
12. the pressure Distribution Test system of fuel cell according to claim 1 to 10, which is characterized in that institute
State pressure-sensitive paper grade be LW LLW one of LLLW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821631883.6U CN209182473U (en) | 2018-10-08 | 2018-10-08 | The pressure Distribution Test system of fuel cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821631883.6U CN209182473U (en) | 2018-10-08 | 2018-10-08 | The pressure Distribution Test system of fuel cell |
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| Publication Number | Publication Date |
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| CN209182473U true CN209182473U (en) | 2019-07-30 |
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ID=67360916
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| CN201821631883.6U Active CN209182473U (en) | 2018-10-08 | 2018-10-08 | The pressure Distribution Test system of fuel cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112770615A (en) * | 2020-12-28 | 2021-05-07 | 常州福普生电子科技有限公司 | Anti-static electronic sensing paper and using method thereof |
-
2018
- 2018-10-08 CN CN201821631883.6U patent/CN209182473U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112770615A (en) * | 2020-12-28 | 2021-05-07 | 常州福普生电子科技有限公司 | Anti-static electronic sensing paper and using method thereof |
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