CN112526358B - Test equipment applied to environment test of fuel cell of sweeper and control method - Google Patents
Test equipment applied to environment test of fuel cell of sweeper and control method Download PDFInfo
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- CN112526358B CN112526358B CN202110174298.8A CN202110174298A CN112526358B CN 112526358 B CN112526358 B CN 112526358B CN 202110174298 A CN202110174298 A CN 202110174298A CN 112526358 B CN112526358 B CN 112526358B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
- B01L7/02—Water baths; Sand baths; Air baths
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/18—Means for temperature control
- B01L2300/1805—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
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- B01L2300/1838—Means for temperature control using fluid heat transfer medium
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Abstract
The invention discloses a test device and a control method applied to an environment test of a fuel cell of a sweeper, wherein a heat exchanger is used for exchanging heat between outside air and air in a cabin of a sealed environment test cabin; the sealed environment testing bin comprises an air inlet channel, a heat exchange channel, an air outlet channel and a fuel cell testing cavity, wherein an air inlet end of the heat exchange channel is communicated with an air outlet of the fuel cell testing cavity, and an air inlet end of the heat exchange channel is communicated with one end of the air inlet channel; the air outlet end of the heat exchange channel is communicated with the air inlet of the fuel cell testing cavity, and the air outlet end of the heat exchange channel is communicated with one end of the air outlet channel; the other end of the air inlet channel is communicated with an air outlet of the heat exchanger; the other end of the air outlet channel is communicated with a first air inlet of the heat exchanger. The control method comprises an air inlet stage, an air supply stage and a test stage. The test equipment and the control method avoid the load increase when the sealed environment test bin heats or refrigerates new air.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a test device and a control method applied to an environment test of a fuel cell of a sweeper.
Background
At present, the sweeper has gradually switched the original mode of using a storage battery as power to the mode of using a fuel cell as power. The fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electric energy through electrochemical reaction, and is not limited by the Carnot cycle effect, so the efficiency is high; in addition, fuel cells use fuel and oxygen as raw materials; meanwhile, no mechanical transmission part is arranged, so that no noise pollution is caused, and the discharged substances are mainly heat energy and water, so that the sweeper is quieter in application and more environment-friendly.
The power generation system of the fuel cell needs to test the use environment before use, and the environment test equipment is a common test instrument and is used for simulating the use environment condition of the system. Mainly takes the simulation of high and low temperature and high and low humidity as main points. The interior of the conventional environment testing equipment is a closed space, and the testing temperature is adjusted by heating or refrigerating equipment. There was no air exchange with the outside during the whole test. However, the application environment of the sweeper is severe, the sweeper often works slowly and durably outdoors with large dust, high temperature or high humidity, all sweeping and conveying mechanisms on the sweeper need to be powered by a fuel cell, the fuel cell has long working time and large load, and fresh air needs to be introduced to provide oxygen when heat needs to be discharged in time; therefore, before the fuel cell is applied to the sweeper, a set of test equipment and a test method for enabling the sweeper fuel cell to still efficiently and durably provide electric energy under the environment with large external dust, high temperature or high humidity are required to be made according to the possible practical application environment of the sweeper, and a detection reference is provided for the subsequent practical application technology of the fuel cell on the sweeper.
The existing environmental test equipment is over-ideal and is more effective and suitable when testing conventional fuel cell products without fresh air flow requirements. However, the existing testing equipment cannot meet the testing requirements for the fuel cell product which is applied to the sweeper and needs to continuously consume oxygen in fresh air to ensure the power supply requirement. If in order to satisfy the test requirement, the rated amount of fresh air is simply introduced according to the test requirement, except that the heating or refrigeration load of the equipment can be increased by several times, also because a large amount of fresh air is introduced, a large amount of water vapor contained in the fresh air can be solidified on a condenser of the environment test equipment during the low-temperature test, and further the structure inside the test equipment is blocked, the air in the test bin can not circulate, the set target temperature can not be reached, in addition, when the high-temperature test and the low-temperature test are carried out, the humidity change of the fresh air is different, therefore, the humidity of the fresh air needs to be adjusted in real time according to a specific test scene, the test precision can be reached, and the main reason that the existing equipment can not realize the introduction of the fresh air to carry out.
Disclosure of Invention
In view of the above defects, the present invention aims to provide a testing apparatus and a control method for an environmental test of a fuel cell of a sweeper, which can avoid the load increase when the sealed environmental test chamber heats or refrigerates new air, and can also avoid the blockage of the heat exchange channel due to the solidification of a large amount of water vapor in the new air.
In order to achieve the purpose, the invention adopts the following technical scheme: a test device applied to environmental test of a fuel cell of a sweeper comprises a heat exchanger and a sealed environment test bin;
the heat exchanger comprises a first air inlet, a second air inlet and an air outlet, and is used for exchanging heat between outside air and air in the sealed environment test bin;
the sealed environment testing bin comprises an air inlet channel, a heat exchange channel, an air outlet channel and a fuel cell testing cavity, wherein the air inlet end of the heat exchange channel is communicated with the air outlet of the fuel cell testing cavity, and the air inlet end of the heat exchange channel is communicated with one end of the air inlet channel; the air outlet end of the heat exchange channel is communicated with the air inlet of the fuel cell testing cavity, and the air outlet end of the heat exchange channel is communicated with one end of the air outlet channel;
the other end of the air inlet channel is communicated with an air outlet of the heat exchanger; the other end of the air outlet channel is communicated with a first air inlet of the heat exchanger.
For example, the heat exchanger further comprises a compressor and an air storage tank, wherein an air inlet pipeline extends outwards from the second air inlet of the heat exchanger, and the compressor and the air storage tank are sequentially arranged in series in the air inlet pipeline.
It is worth to say that a humidity adjusting device, a pressure adjusting device and a flow adjusting device are arranged between the air storage tank and the heat exchanger, and the humidity adjusting device, the pressure adjusting device and the flow adjusting device are sequentially arranged in the air inlet pipeline in series.
Optionally, the system further comprises a detection mechanism and a processing mechanism, wherein the detection mechanism is arranged in the gas storage tank, and the detection mechanism is electrically connected with the processing mechanism.
Specifically, a heat exchange fan is arranged at the air inlet end of the heat exchange channel, the air inlet of the heat exchange fan is close to the air inlet channel, and the air outlet of the heat exchange fan is close to the air outlet channel.
Preferably, a plurality of heat exchange plates are arranged in the heat exchange channel and are perpendicular to the air flowing direction.
In addition, the control method, which uses the test equipment applied to the environmental test of the fuel cell of the sweeper, comprises the following steps:
a: the air inlet stage is as follows: the air is compressed by a compressor and stored in an air storage tank to form first air;
b: the air supply stage is as follows: the first air forms second air after being subjected to humidity adjustment, air pressure adjustment and flow adjustment, and the second air is sent to a heat exchanger;
c: and (3) a testing stage:
c1, cabin air of the fuel cell test cavity of the sealed environment test cabin is sent to the heat exchanger through the air outlet channel;
c2, the air in the bin exchanges heat with the second air in the heat exchanger to convert the second air into third air;
c3, the third air is sent to the sealed environment test chamber through the air inlet channel and is mixed with the air in the chamber through the heat exchange channel of the sealed environment test chamber to form fourth air;
c4, the fourth air being sent to the fuel cell test chamber.
It should be noted that, the specific content of step a is:
a1, setting the upper limit value and the lower limit value of the air pressure of the air storage tank;
a2, detecting the real-time air pressure of the air storage tank by a detection mechanism, and feeding back the real-time air pressure to a processing mechanism in real time; when the real-time air pressure is lower than the air pressure lower limit value, the processing mechanism controls the compressor to start, and the compressor compresses air and stores the air in the air storage tank; and when the real-time air pressure is higher than the upper limit value of the air pressure, the processing mechanism controls the compressor to stop.
Optionally, in the step B, the first air formed in the step a is sent to a humidity adjusting device for adjusting humidity, sent to a pressure adjusting device for adjusting air pressure, and sent to a flow adjusting device for adjusting flow, so as to form second air.
Specifically, in the step C, after the third air is sent to the sealed environment testing bin through the air inlet channel, the heat exchange fan pushes the third air to sequentially pass through all the heat exchange fins and form fourth air.
The invention has the beneficial effects that: the test equipment and the control method applied to the environment test of the fuel cell of the sweeper are characterized in that cabin air in the fuel cell test cavity is sent to the heat exchanger and is subjected to heat exchange with external air newly entering from the second air inlet of the heat exchanger, then the newly entering air is discharged into the sealed environment test cabin and is mixed with the cabin air in the heat exchange channel, so that the phenomenon that the load is increased when the sealed environment test cabin heats or refrigerates the new air is avoided, and in addition, the phenomenon that the heat exchange channel is blocked due to the solidification of a large amount of water vapor in the external air can be avoided during refrigeration.
When the fuel cell is subjected to a high-temperature test, external air enters the heat exchanger from the second air inlet of the heat exchanger, air in the bin of the fuel cell test cavity enters the heat exchanger after passing through the heat exchange channel and the air outlet channel, the external air and the air in the bin of the fuel cell test cavity exchange heat in the heat exchanger so as to heat the external air to raise the temperature, the heated external air enters the sealed environment test bin through the air outlet of the heat exchanger, is mixed with the air in the bin through the heat exchange channel and then is continuously heated, and finally reaches the fuel cell test cavity. As the outside air is heated in the heat exchanger in advance, when the outside air passes through the heat exchange channel, the load of the heat exchange channel can be reduced, and the load of the heat exchange channel does not need to be greatly increased, thereby achieving the effect of saving energy.
When the fuel cell is subjected to a low-temperature test, external air firstly passes through the heat exchanger and air in the fuel cell test cavity discharged from the air outlet channel to perform heat exchange and temperature reduction, and then enters the sealed environment test bin from the air inlet channel and the heat exchange channel, and the load of the heat exchange channel in the sealed environment test bin is not required to be greatly increased, so that the energy-saving effect is achieved; meanwhile, outside air and low-temperature flowing air in the bin of the fuel cell testing chamber is cooled through the heat exchange channel after heat exchange, a large amount of water vapor cannot be condensed on the heat exchange channel, the heat exchange channel cannot be blocked, and the air in the sealed environment testing bin normally circulates to work to reach the set target temperature.
Drawings
FIG. 1 is a schematic gas flow diagram of a test apparatus in one embodiment of the invention;
FIG. 2 is a schematic diagram of the structure of a test apparatus in one embodiment of the invention;
FIG. 3 is a schematic diagram of a closed environment test chamber according to an embodiment of the present invention.
Wherein: 1, a heat exchanger; 11 a first air inlet; 12 a second air inlet; 13 air outlet; 2, sealing an environment test bin; 21 an intake passage; 22 heat exchange channels; 23 air outlet channel; 24 a fuel cell test area; 25 heat exchange fans; 26 heat exchange fins; 3, a compressor; 4, a gas storage tank; 5, a detection mechanism; 6, a processing mechanism; 7 a humidity adjusting device; 8 a pressure regulating device; 9 flow regulating means.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes, with reference to fig. 1 to 3, a testing apparatus applied to an environmental test of a fuel cell of a sweeper, according to an embodiment of the present invention, including a heat exchanger 1 and a sealed environment testing chamber 2;
the heat exchanger 1 comprises a first air inlet 11, a second air inlet 12 and an air outlet 13, and the heat exchanger 1 is used for exchanging the outside air with the air in the sealed environment test bin 2;
the sealed environment testing bin 2 comprises an air inlet channel 21, a heat exchange channel 22, an air outlet channel 23 and a fuel cell testing cavity 24, wherein the air inlet end of the heat exchange channel 22 is communicated with an air outlet of the fuel cell testing cavity 24, and the air inlet end of the heat exchange channel 22 is communicated with one end of the air inlet channel 21; the air outlet end of the heat exchange channel 22 is communicated with the air inlet of the fuel cell testing cavity 24, and the air outlet end of the heat exchange channel 22 is communicated with one end of the air outlet channel 23;
the other end of the air inlet channel 21 is communicated with an air outlet 13 of the heat exchanger 1; the other end of the air outlet channel 23 is communicated with the first air inlet 11 of the heat exchanger 1.
Be applied to test equipment of street sweeper fuel cell environmental test through with fuel cell test chamber 24's the storehouse air is sent to heat exchanger 1 and follow the second air inlet 12 of heat exchanger 1 external air heat exchange back of newly coming in again discharges the air of newly coming in sealed environment test storehouse 2 to mix with the storehouse internal air in heat transfer passageway 22, thereby avoided sealed environment test storehouse 2 heats or increases the load when refrigerating new air, in addition, when refrigerating, can also avoid making because a large amount of steam solidifies in the external air heat transfer passageway 22 blocks up.
As shown in fig. 1 and 3, the direction of the arrows is the direction of air flow. When a fuel cell is subjected to a high-temperature test, outside air enters the heat exchanger 1 from the second air inlet 12 of the heat exchanger 1, air in the bin of the fuel cell test cavity 24 enters the heat exchanger 1 after passing through the heat exchange channel 22 and the air outlet channel 23, the outside air and the air in the bin of the fuel cell test cavity 24 exchange heat in the heat exchanger 1 so as to heat the outside air to increase the temperature, the heated outside air enters the sealed environment test bin 2 through the air outlet 13 of the heat exchanger 1, and is mixed with the air in the bin through the heat exchange channel 22 to continue heating, and finally reaches the fuel cell test cavity 24. Since the outside air is heated in the heat exchanger 1 in advance, when the outside air passes through the heat exchange channel 22, the load of the heat exchange channel 22 can be reduced, and the load of the heat exchange channel 22 does not need to be increased greatly, thereby achieving the effect of saving energy.
When the fuel cell is subjected to a low-temperature test, external air firstly passes through the heat exchanger 1 and air in the fuel cell test cavity 24 discharged from the air outlet channel 23 to exchange heat and cool, and then enters the sealed environment test chamber 2 from the air inlet channel 21 and the heat exchange channel 22, and the load of the heat exchange channel 22 in the sealed environment test chamber 2 does not need to be increased greatly, so that the energy-saving effect is achieved; meanwhile, outside air and low-temperature flowing air in the fuel cell testing chamber 24 passes through the heat exchange channel 22 after being subjected to heat exchange and cooling, a large amount of water vapor cannot be condensed on the heat exchange channel 22, the heat exchange channel 22 cannot be blocked, and the air in the sealed environment testing chamber 2 normally circulates and works to reach the set target temperature.
In some embodiments, as shown in fig. 2, the heat exchanger further comprises a compressor 3 and an air storage tank 4, an air inlet pipeline extends outwards from the second air inlet 12 of the heat exchanger 1, and the compressor 3 and the air storage tank 4 are sequentially arranged in series in the air inlet pipeline.
The compressor 3 is preferably an oil-free air compressor, the compressor 3 is used for compressing outside air and storing the compressed air in the air storage tank 4, and when a test is needed, the compressed air can be rapidly conveyed to the heat exchanger 1 and the sealed environment test bin 2 through the air storage tank 4.
For example, a humidity adjusting device 7, a pressure adjusting device 8 and a flow adjusting device 9 are arranged between the air storage tank 4 and the heat exchanger 1, and the humidity adjusting device 7, the pressure adjusting device 8 and the flow adjusting device 9 are sequentially arranged in series in the air inlet pipeline.
The humidity adjusting device 7 is preferably a humidification dehumidifier, and the adjusted air reaches the tested humidity standard by adjusting the humidity adjusting device 7. The pressure regulating device 8 is preferably a pressure reducing regulator, and the air pressure is adjusted to reach the tested air pressure standard by regulating the pressure regulating device 8. The flow regulating device 9 is preferably a flow meter, and the air is adjusted to the tested flow standard by regulating the flow regulating device 9.
It is worth to say, still include detection mechanism 5 and processing mechanism 6, detection mechanism 5 sets up in gas holder 4, detection mechanism 5 with processing mechanism 6 electricity is connected.
The detection means 5 is preferably an air pressure sensor for measuring the air pressure of the air reservoir 4, and the processing means 6 is preferably a computer or a PLC. When the air pressure measured by the detection means 5 is lower than the air pressure lower limit value, the air pressure of the air sent out from the air storage tank 4 may not reach the standard. When the air pressure measured by the detection mechanism 5 is higher than the upper limit value of the air pressure, the air pressure of the air sent out by the air storage tank 4 can be caused to exceed the standard; in addition, the gas storage tank 4 is easily exploded due to excessively high gas pressure in the gas storage tank 4, and the structure improves safety during production.
Optionally, a heat exchange fan 25 is disposed at an air inlet end of the heat exchange channel 22, an air inlet of the heat exchange fan 25 is close to the air inlet channel 21, and an air outlet of the heat exchange fan 25 is close to the air outlet channel 23.
Third air enters from the air inlet end of the heat exchange channel 22 and then is mixed with air in the bin flowing out of the fuel cell testing cavity 24, and the mixed air continues to flow under the flowing action of the third air, passes through the heat exchange channel 22 and enters the fuel cell testing cavity 24 or is discharged from the air outlet channel 23; although the heat exchange fan 25 is not arranged in the heat exchange channel 22, the air in the sealed environment test bin 2 also flows, and after the heat exchange fan 25 is additionally arranged in the heat exchange channel 22, the flow speed of the air in the sealed environment test bin 2 can be increased, so that the high-load test of the fuel cell can be ensured, and the test efficiency can also be improved.
Specifically, a plurality of heat exchange plates 26 are arranged in the heat exchange channel 22, and the heat exchange plates 26 are arranged perpendicular to the air flowing direction.
The structure can improve the heat exchange efficiency. When the fuel cell is tested at low temperature, the load of the heat exchange fins 26 does not need to be increased greatly, so that the energy-saving effect is achieved, meanwhile, a large amount of water vapor can not be condensed on the heat exchange fins 26 and further can not block the heat exchange channel 22 after the newly-fed supplemented air is mixed with the low-temperature flowing air in the bin and then passes through the heat exchange channel 22; when the fuel cell is subjected to a high-temperature test, the load of the heat exchange fins 26 does not need to be greatly increased, so that the energy-saving effect is achieved.
In addition, a control method using the testing device applied to the environmental test of the fuel cell of the sweeper in the embodiment comprises the following steps:
a: the air inlet stage is as follows: the air is compressed by the compressor 3 and stored in the air storage tank 4 to form first air;
b: the air supply stage is as follows: the first air forms second air after adjusting humidity, air pressure and flow, and the second air is sent to the heat exchanger 1;
c: and (3) a testing stage:
c1, cabin air of the fuel cell test cavity 24 of the sealed environment test cabin 2 is sent to the heat exchanger 1 through the air outlet channel 23;
c2, the air in the bin exchanges heat with the second air in the heat exchanger 1 to convert the second air into third air;
c3, the third air is sent to the sealed environment test chamber 2 through the air inlet channel 21 and is mixed with the air in the chamber to form fourth air through the heat exchange channel 22 of the sealed environment test chamber 2;
c4, the fourth air being sent to the fuel cell test chamber 24.
According to the control method, the second air and the air in the cabin which reach the humidity standard, the air pressure standard and the flow standard are subjected to heat exchange heating or refrigerating by the heat exchanger 1 outside the sealed environment test cabin 2, then are sent to the heat exchange channel 22 of the sealed environment test cabin 2 to be mixed with the air in the cabin for further heating or refrigerating, and finally are sent to the fuel cell test cavity 24, so that the phenomenon that the load is increased when the sealed environment test cabin 2 heats or refrigerates new air is avoided. In addition, when refrigerating, the heat exchange channel 22 can be prevented from being blocked due to the solidification of a large amount of water vapor in the outside air.
In some embodiments, the specific content of step a is:
a1, setting the upper limit value and the lower limit value of the air pressure of the air storage tank 4;
a2, detecting the real-time air pressure of the air storage tank 4 by a detection mechanism 5, and feeding back the real-time air pressure to a processing mechanism 6 in real time; when the real-time air pressure is lower than the air pressure lower limit value, the processing mechanism 6 controls the compressor 3 to start, and the compressor 3 compresses air and stores the air in the air storage tank 4; when the real-time air pressure is higher than the upper limit value of the air pressure, the processing mechanism 6 controls the compressor 3 to stop.
When the real-time air pressure is lower than the air pressure lower limit value, the air pressure of the first air sent out by the air storage tank 4 may not reach the standard, and thus the energy consumption of the air supply step may be increased. When the real-time air pressure is higher than the upper limit value of the air pressure, the air pressure of the first air sent out by the air storage tank 4 can be caused to exceed the standard, so that the energy consumption of the air supply step can be increased; in addition, the gas storage tank 4 is easy to explode due to the fact that the gas pressure in the gas storage tank 4 is too high, and the safety during production is improved through the steps.
For example, in the step B, the first air formed in the step a is sequentially sent to the humidity adjusting device 7 to adjust the humidity, the pressure adjusting device 8 to adjust the air pressure, and the flow rate adjusting device 9 to adjust the flow rate, thereby forming the second air.
The humidity control device 7 is preferably a humidification dehumidifier, the pressure control device 8 is preferably a pressure reduction control device, and the flow control device 9 is preferably a flow rate controller. In the step B, the humidity adjusting device 7 is adjusted to enable the adjusted air to reach the tested humidity standard; in the step B, the pressure adjusting device 8 is adjusted to enable the second air to reach a tested air pressure standard; in step B, the flow rate regulation device 9 is adjusted to make the second air reach the tested flow rate standard.
It should be noted that in the step C, after the third air is sent to the sealed environment testing chamber 2 through the air inlet channel 21, the heat exchanging fan 25 pushes the third air to pass through all the heat exchanging fins 26 in sequence and form fourth air.
When the fuel cell is tested at low temperature, the load of the heat exchange fins 26 does not need to be increased greatly, so that the energy-saving effect is achieved, meanwhile, the newly-fed supplemented second air is mixed with the low-temperature flowing air in the bin and then passes through the heat exchange channel 22, a large amount of water vapor cannot be condensed on the heat exchange fins 26, and further the heat exchange channel 22 cannot be blocked; when the fuel cell is subjected to a high-temperature test, the load of the heat exchange fins 26 does not need to be greatly increased, so that the energy-saving effect is achieved. The heat exchange fan 25 can accelerate the flow speed of the third air, and the test efficiency is improved.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a be applied to test equipment of street sweeper fuel cell environmental test which characterized in that: the device comprises a heat exchanger and a sealed environment test bin;
the heat exchanger comprises a first air inlet, a second air inlet and an air outlet, and is used for exchanging heat between outside air and air in the sealed environment test bin;
the sealed environment testing bin comprises an air inlet channel, a heat exchange channel, an air outlet channel and a fuel cell testing cavity, wherein the air inlet end of the heat exchange channel is communicated with the air outlet of the fuel cell testing cavity, and the air inlet end of the heat exchange channel is communicated with one end of the air inlet channel; the air outlet end of the heat exchange channel is communicated with the air inlet of the fuel cell testing cavity, and the air outlet end of the heat exchange channel is communicated with one end of the air outlet channel;
the other end of the air inlet channel is communicated with an air outlet of the heat exchanger; the other end of the air outlet channel is communicated with a first air inlet of the heat exchanger.
2. The test equipment applied to the environmental test of the fuel cell of the sweeper according to claim 1, wherein: still include compressor and gas holder, the second air inlet of heat exchanger outwards extends and is equipped with the admission line, compressor and gas holder are established ties in proper order and are set up admission line.
3. The test equipment applied to the environmental test of the fuel cell of the sweeper according to claim 2, is characterized in that: a humidity adjusting device, a pressure adjusting device and a flow adjusting device are arranged between the gas storage tank and the heat exchanger, and the humidity adjusting device, the pressure adjusting device and the flow adjusting device are sequentially connected in series to be arranged in the gas inlet pipeline.
4. The test equipment applied to the environmental test of the fuel cell of the sweeper according to claim 3, wherein: the gas storage tank is characterized by further comprising a detection mechanism and a processing mechanism, wherein the detection mechanism is arranged in the gas storage tank, and the detection mechanism is electrically connected with the processing mechanism.
5. The test equipment applied to the environmental test of the fuel cell of the sweeper, according to claim 4, is characterized in that: the air inlet end of the heat exchange channel is provided with a heat exchange fan, the air inlet of the heat exchange fan is close to the air inlet channel, and the air outlet of the heat exchange fan is close to the air outlet channel.
6. The test equipment applied to the environmental test of the fuel cell of the sweeper according to claim 5, wherein: a plurality of heat exchange plates are arranged in the heat exchange channel and are perpendicular to the air flowing direction.
7. A control method using the test device for the environmental test of the fuel cell of the sweeper as claimed in claim 6, wherein: the method comprises the following steps:
a: the air inlet stage is as follows: the air is compressed by a compressor and stored in an air storage tank to form first air;
b: the air supply stage is as follows: the first air forms second air after being subjected to humidity adjustment, air pressure adjustment and flow adjustment, and the second air is sent to a heat exchanger;
c: and (3) a testing stage:
c1, cabin air of the fuel cell test cavity of the sealed environment test cabin is sent to the heat exchanger through the air outlet channel;
c2, the air in the bin exchanges heat with the second air in the heat exchanger to convert the second air into third air;
c3, the third air is sent to the sealed environment test chamber through the air inlet channel and is mixed with the air in the chamber through the heat exchange channel of the sealed environment test chamber to form fourth air;
c4, the fourth air being sent to the fuel cell test chamber.
8. A control method according to claim 7, characterized in that: the specific content of the step A is as follows:
a1, setting the upper limit value and the lower limit value of the air pressure of the air storage tank;
a2, detecting the real-time air pressure of the air storage tank by a detection mechanism, and feeding back the real-time air pressure to a processing mechanism in real time; when the real-time air pressure is lower than the air pressure lower limit value, the processing mechanism controls the compressor to start, and the compressor compresses air and stores the air in the air storage tank; and when the real-time air pressure is higher than the upper limit value of the air pressure, the processing mechanism controls the compressor to stop.
9. A control method according to claim 8, characterized in that: in the step B, the first air formed in the step A is sequentially sent to a humidity adjusting device for adjusting the humidity, sent to a pressure adjusting device for adjusting the air pressure and sent to a flow adjusting device for adjusting the flow, so that second air is formed.
10. A control method according to claim 9, characterized in that: in the step C, after the third air is sent to the sealed environment testing bin through the air inlet channel, the heat exchange fan pushes the third air to sequentially pass through all the heat exchange fins and form fourth air.
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