CN115127845A - Radiator testing method and deionized water circulation simulation system - Google Patents
Radiator testing method and deionized water circulation simulation system Download PDFInfo
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- CN115127845A CN115127845A CN202210748817.1A CN202210748817A CN115127845A CN 115127845 A CN115127845 A CN 115127845A CN 202210748817 A CN202210748817 A CN 202210748817A CN 115127845 A CN115127845 A CN 115127845A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 265
- 239000008367 deionised water Substances 0.000 title claims abstract description 225
- 229910021641 deionized water Inorganic materials 0.000 title claims abstract description 225
- 238000004088 simulation Methods 0.000 title claims abstract description 122
- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 230000000630 rising effect Effects 0.000 claims abstract description 40
- 230000007613 environmental effect Effects 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 abstract description 16
- 239000000446 fuel Substances 0.000 description 16
- 239000000110 cooling liquid Substances 0.000 description 11
- 230000003068 static effect Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- 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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Abstract
The invention discloses a radiator testing method and a deionized water circulation simulation system, wherein the radiator testing method comprises the following steps: (1) communicating the radiator with a deionized water circulation simulation system; injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water at a set environmental temperature, and measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and marking as initial conductivity a; (2) controlling the deionized water circulation simulation system to be in a set state at the environmental temperature set in the step (1), and measuring the actual conductivity b of the deionized water circulation simulation system after a set time t; (3) calculating the rising rate K of the conductivity by the formula (b-a)/t; and determining whether the radiator is qualified or not according to the rising rate K, and carrying the radiator with qualified rising rate of ion precipitation on the vehicle by testing the ion precipitation of the radiator.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to a radiator testing method and a deionized water circulation simulation system.
Background
The fuel cell automobile has the advantages of cleanness, no pollution, high efficiency, low noise and the like, and is in a rapid development stage at present, but due to the restriction of factors such as cost, period and the like, the radiator used by the fuel cell automobile at present basically continues to use the radiator of the traditional fuel oil automobile, and the development of a special radiator for the fuel cell automobile is not carried out. The selection of the radiator directly influences the conductivity of the cooling liquid of the fuel cell automobile, if the conductivity of the cooling liquid is increased sharply in a short period, the insulation resistance value of a fuel cell system is reduced, the safety of the whole automobile is considered at the moment, the torque limitation is carried out on the operation condition of the automobile, and the dynamic property is reduced.
In addition, after the radiator is mounted on the fuel cell vehicle, the conductivity is generally ensured by regularly replacing the cooling liquid to meet the requirement, but the frequent replacement of the cooling liquid causes high cost of the cooling liquid and long replacement time, thereby limiting the market competitiveness of the fuel cell vehicle.
In summary, the prior art faces the technical problem of how to reasonably select the radiator to ensure that the conductivity of the coolant reaches the whole vehicle standard in the replacement period, thereby improving the economy and safety of the fuel cell vehicle.
Disclosure of Invention
In order to solve the technical problems, the invention aims to overcome the defects of the prior art and provide a radiator testing method and a deionized water circulation simulation system, the radiator is tested through ion precipitation, and a radiator with qualified ion precipitation rising rate is carried on a vehicle, so that the economic problem caused by frequent replacement of cooling liquid in a set replacement period and the safety problem caused by over standard conductivity are avoided.
The technical scheme for realizing the technical purpose of the invention is that the radiator testing method comprises the following steps:
(1) communicating the radiator with a deionized water circulation simulation system; injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate at a set environmental temperature so as to discharge bubbles in the deionized water, and measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and marking the conductivity as initial conductivity a;
(2) controlling the deionized water circulation simulation system to be in a set state at the set environmental temperature in the step (1), and measuring the actual conductivity b of the deionized water circulation simulation system after a set time t;
(3) calculating the rising rate K of the conductivity through a formula (b-a)/t; and determining whether the radiator is qualified or not according to the rising rate K.
In some embodiments, in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically includes: and controlling the deionized water circulation simulation system to stand and/or operate within a set time t.
In some embodiments, in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically includes: and heating the deionized water in the deionized water circulation simulation system to a set working water temperature, and controlling the deionized water circulation simulation system to continuously operate for the set time t.
In some embodiments, in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically includes: and controlling the deionized water circulation simulation system to stand for the set time t.
In some embodiments, in step (3), if the heat sink is determined to be qualified, the heat sink testing method further includes: (4) dynamic verification:
(4-1) injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water at a set environmental temperature, and measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and marking as a second initial conductivity c;
(4-2) heating the deionized water in the deionized water circulation simulation system to a set working water temperature at the ambient temperature set in the step (4-1), controlling the deionized water circulation simulation system to continuously operate, and measuring a second actual conductivity d of the deionized water circulation simulation system after a set time t 1;
(4-3) calculating a rising rate K of the conductivity by the formula (d-c)/t 1; and verifying whether the radiator is qualified or not according to the rising rate K.
In some embodiments, the heat sink testing method further comprises repeating steps (1) through (3) and changing at least one of the ambient temperature, the operating water temperature, and the flow rate of the deionized water.
In some embodiments, in step (1), controlling the operation of the deionized water circulation simulation system to discharge bubbles in the deionized water includes:
and controlling the deionized water circulation simulation system to continuously operate, detecting the water pressure change of the deionized water circulation simulation system in real time in the operation process, and judging that the bubbles in the deionized water are completely discharged when the water pressure change is smaller than a set threshold value.
In some embodiments, in the step (3), determining whether the radiator is qualified according to the rising rate K specifically includes: and comparing the rising rate K with a set rate Ks, and if K is less than or equal to Ks, determining that the radiator is qualified.
Based on the same inventive concept, the invention also provides a deionized water circulation simulation system for implementing the radiator testing method, which comprises the following steps:
the environment bin is provided with an installation cavity for accommodating the radiator and is used for simulating different environment parameters;
the circulation simulation assembly comprises a driving device and a kettle body for containing deionized water, which are communicated through a pipeline, and the radiator is connected in series with the circulation simulation assembly to form a deionized water circulation loop;
and the ion concentration detection device is arranged on the deionized water circulating loop and is used for detecting the conductivity of the deionized water circulating loop.
In some embodiments, the deionized water circulation simulation system further comprises,
the heating device is arranged in the deionized water circulating loop and is used for heating the deionized water;
the temperature detection device is arranged on the deionized water circulation loop and used for detecting the temperature of the deionized water in the deionized water circulation loop;
the pressure detection device is arranged in the deionized water circulation loop and used for detecting the water pressure of the deionized water circulation loop;
and the flow detection device is arranged in the deionized water circulating loop and is used for detecting the flow of the deionized water in the deionized water circulating loop.
According to the technical scheme, the radiator testing method provided by the invention is used for evaluating and judging the ion deposition rate of the radiator, and selecting the radiator with low or qualified ion deposition rate to be mounted on the fuel cell vehicle, and comprises the following steps:
(1) communicating the radiator with a deionized water circulation simulation system; injecting deionized water into the deionized water circulation simulation system, controlling the operation of the deionized water circulation simulation system to discharge bubbles in deionized water at a set environmental temperature, wherein the bubbles in the deionized water occupy the volume of the deionized water and can cause cavitation erosion of water pump blades, and the discharged bubbles enable a test result to be closer to the actual use condition after carrying. Measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and recording the conductivity as initial conductivity a;
(2) and (2) controlling the deionized water circulation simulation system to be in a set state at the set environmental temperature in the step (1), and measuring the actual conductivity b of the deionized water circulation simulation system after the set time t, namely ensuring that the environmental temperature is unchanged, and obtaining the conductivity after the temperature rises under the same environmental temperature.
(3) Calculating the rising rate K of the conductivity by the formula (b-a)/t; and determining whether the radiator is qualified according to the rising rate K. According to the testing method of the radiator, the initial conductivity a of fresh deionized water and the actual conductivity b after the set time t in the set state, namely the final state conductivity, are measured, the conductivity rising rate under the current testing condition is calculated, the working condition after the actual loading on a fuel cell vehicle can be deduced, the ion precipitation condition of the radiator is evaluated, and the radiator qualified in ion precipitation is selected, so that the conductivity of the deionized water in the set replacement period always meets the standard of the whole vehicle, the cost for frequently replacing the cooling liquid is saved, the safety is improved, and the maintenance and the use of the vehicle are facilitated.
The invention provides a deionized water circulation simulation system which is used for implementing the radiator test method and comprises a circulation simulation assembly, an environment bin and an ion concentration detection device; the circulation simulation assembly comprises a driving device and a kettle body, wherein the driving device is communicated with the kettle body through a pipeline, the kettle body is used for containing deionized water, and the radiator is connected in series with the circulation simulation assembly to form a deionized water circulation loop; the radiator sets up in the installation intracavity in environment storehouse, and the environment storehouse is used for simulating different environmental parameter such as ambient temperature, can realize the operating mode simulation of radiator under the different conditions. The ion concentration detection device is arranged on the deionized water circulation loop and used for detecting the conductivity of the deionized water circulation loop. Each component in the deionized water circulation simulation system basically has no ion output, and the rising rate K of the conductivity is obtained by measuring the initial conductivity a of the deionized water in the deionized water circulation simulation system and the actual conductivity b after the set time t, so that the ion precipitation condition of the radiator to be detected is evaluated.
Drawings
Fig. 1 is a flowchart of a heat sink testing method provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a deionized water circulation simulation system according to embodiment 2 of the present invention.
Description of reference numerals: 1-radiator, 11-inlet, 12-outlet; 2-an environment bin; 3-a circulation simulation component, 31-a driving device and 32-a kettle body; 4-an ion concentration detection device; 5-a heating device; 6-temperature detection means; 7-a pressure detection device; 8-a flow detection device; 9-a control unit.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings.
The technical problem of how to reasonably select the radiator to ensure that the conductivity of the cooling liquid reaches the whole vehicle standard in a replacement period so as to improve the economy and the safety of the fuel cell vehicle in the prior art is solved. The invention provides a radiator testing method and a deionized water circulation simulation system, which are characterized in that the ion precipitation condition of a radiator is tested and evaluated before the radiator is carried on a vehicle, whether the radiator is qualified or not and whether the radiator can be applied to the vehicle or not are evaluated, and the electric conductivity of the deionized water in a set replacement period is always in accordance with the standard of the whole vehicle by carrying the radiator with qualified ion precipitation rising rate.
The technical scheme of the invention is described in detail by two specific embodiments as follows:
example 1
The embodiment provides a radiator testing method, which is used for evaluating and judging the ion precipitation rate of a radiator, and selecting a radiator with low or qualified ion precipitation rate to be mounted on a fuel cell vehicle, and comprises the following steps:
(1) communicating the radiator with a deionized water circulation simulation system; injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water at the set environmental temperature, wherein the bubbles in the deionized water occupy the volume of the deionized water, and the bubbles can cause cavitation of water pump blades, so that the test result is closer to the actual use condition after carrying. Measuring the conductivity of the deionized water in the deionized water circulating simulation system after the bubbles are discharged, and recording as initial conductivity a;
(2) and (2) controlling the deionized water circulation simulation system to be in a set state at the set environmental temperature in the step (1), and measuring the actual conductivity b of the deionized water circulation simulation system after the set time t, namely ensuring that the environmental temperature is unchanged to obtain the conductivity after the temperature rises under the same environmental temperature.
(3) Calculating the rising rate K of the conductivity through a formula (b-a)/t; and determining whether the radiator is qualified according to the rising rate K. According to the testing method of the radiator, the initial conductivity a of fresh deionized water and the actual conductivity b after the set time t in the set state, namely the final state conductivity, are measured, the conductivity rising rate under the current testing condition is calculated, the working condition after the actual loading on a fuel cell vehicle can be deduced, the ion precipitation condition of the radiator is evaluated, and the radiator qualified in ion precipitation is selected, so that the conductivity of the deionized water in the set replacement period always meets the standard of the whole vehicle, the cost for frequently replacing the cooling liquid is saved, the safety is improved, and the maintenance and the use of the vehicle are facilitated.
In order to simulate various working conditions of the radiator after being mounted on a vehicle, in this embodiment, in step (2), the deionized water circulation simulation system is controlled to be in a set state, which specifically includes: and controlling the deionized water circulation simulation system to stand and/or operate within a set time t. When the working condition is that the standing and the running exist at the same time, the set time and the set state of the standing and the running are not specifically limited. The invention does not limit the specific working condition of operation, and the deionized water circulation simulation system can be operated under a variable working condition within the set time t, or can be changed from a first working condition to a second working condition within the set time t and operated from the second working condition until the operation is finished.
Through analysis, the applicant finds that, generally, when a test is performed under the same environmental conditions, the increase of the conductivity under the dynamic operation working condition is higher than that under the static working condition, so that the rising rate K obtained under the static working condition meets the requirement, and whether the conductivity rising rate under the worse working condition meets the requirement cannot be deduced, and if the conductivity rising rate can meet the requirement under the dynamic working condition, the rising rate K under the static working condition corresponding to the same environmental parameters can meet the requirement inevitably.
Therefore, the heat sink testing method provided by the application has two embodiments: a, directly carrying out a dynamic test, namely obtaining actual conductivity b after working for a set time t in a continuous operation state; and in the scheme B, because the static test cost is lower, the static test can be firstly carried out, namely the static test is carried out, namely the deionized water circulation simulation system is controlled to keep standing for the set time t to obtain the actual conductivity B, if the obtained rising rate K is unqualified, the deionized water circulation simulation system is directly judged to be unqualified and can not be carried, and if the obtained rising rate K is qualified, the dynamic test is carried out for verification.
It should be noted that, the determination of whether the radiator is qualified or not is only for a single radiator, but since the radiator and the fuel cell vehicle are produced in batches, the radiator in a batch needs to be tested, the batch is determined to be qualified and can be loaded only by determining that the batch is qualified, and if at least one set of data determines that the batch is not qualified, the radiator in the batch is not available. The testing of a batch may include both static testing and dynamic testing, i.e., partially using protocol A and partially using protocol B.
In the solution a, in order to simplify the testing method and facilitate comprehensive comparison of multiple sets of data for evaluating subsequent carrying performance, such as analyzing the influence of working condition variation parameters on ion deposition of the heat sink, preferably, in step (2), the deionized water circulation simulation system is controlled to be in a set state, which specifically includes: heating the deionized water in the deionized water circulation simulation system to a set working water temperature, and controlling the deionized water circulation simulation system to continuously operate for a set time t under the same set working condition so as to analyze the influence degree of parameters such as the environmental temperature, the working water temperature, the operating speed and the like.
For the scheme B, in this embodiment, in the step (2), the controlling the deionized water circulation simulation system to be in the set state specifically includes: and controlling the deionized water circulation simulation system to stand for a set time t. In the step (3), if the radiator is determined to be qualified, the radiator testing method further includes:
(4) dynamic verification:
(4-1) injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water at a set environmental temperature, and measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and marking the conductivity as a second initial conductivity c;
(4-2) heating the deionized water in the deionized water circulation simulation system to a set working water temperature under the environmental temperature set in the step (4-1), controlling the deionized water circulation simulation system to continuously operate, and measuring a second actual conductivity d of the deionized water circulation simulation system after a set time t 1;
(4-3) calculating a rising rate K of the conductivity by the formula (d-c)/t 1; and verifying whether the radiator is qualified or not according to the rising rate K.
In this embodiment, the set time t in step (2) and the set time t1 in step (4) in the solution B are not particularly limited, and the set time t1 may be the same or different, and preferably, the set time t1 for continuous operation during dynamic verification in step (4) is ensured to be consistent with the set time t for standing in preamble step (2).
In order to make the measurement result closer to the actual situation, it is preferable that the set time t and the set time t1 are not less than 168 hours.
In the case that the set time t is consistent with the set time t1, the variable parameters involved in the present embodiment include the ambient temperature, the operating water temperature of the deionized water, and the flow rate of the deionized water, and for further verification, the heat sink testing method further includes repeating the steps (1) to (3), and changing at least one parameter of the ambient temperature, the operating water temperature, and the flow rate of the deionized water. The repetition herein may refer to the testing of the same heat sink, or may refer to the simultaneous testing of other heat sinks of the same lot under selective inspection, with at least one of the parameters being changed.
The reference for judging the complete elimination of the bubbles of the deionized water is not particularly limited, and any feasible scheme can be adopted, for example, the bubbles of the deionized water are observed by eyes, no obvious small bubbles are observed as the reference, or a specific running time t2 is set, and the running time t2 can be obtained through simulation or calculation. In order to determine that the bubbles are completely discharged more intuitively and accurately, in this embodiment, in step (1), the operation of the deionized water circulation simulation system is controlled to discharge the bubbles in the deionized water, which specifically includes: and controlling the deionized water circulation simulation system to continuously operate, detecting the water pressure change of the deionized water circulation simulation system in real time in the operation process, and judging that the bubbles in the deionized water are completely discharged when the water pressure change is smaller than a set threshold value.
In this embodiment, in the step (3), determining whether the heat sink is qualified according to the rising rate K specifically includes: and comparing the rising rate K with the set rate Ks, and if K is less than or equal to Ks, determining that the radiator is qualified.
The set rate Ks can be calculated according to the concentration standard of the deionized water for the industrial vehicle and the required cooling liquid replacement period, the present invention is not limited in particular, and as a preferred embodiment, the set rate Ks is (α 2- α 1)/5000h, α 2 is 8 μ s/cm, and α 1 is 0.5 μ s/cm. Determining whether the radiator is qualified according to the rising rate K, specifically, comparing the sizes of a and alpha 1 and the sizes of b and alpha 2, and if a is less than or equal to alpha 1, b is less than or equal to alpha 2, and Kd is less than or equal to Ks, determining that the radiator is qualified
Since the volume of the deionized water may also affect the ion deposition, in order to make the multiple sets of data capable of being combined with the judgment, it is preferable to control the volumes of the deionized water injected into the deionized water circulation simulation system by each set of tests to be the same when the multiple sets of tests are performed on the radiators of the same batch.
According to the radiator testing method provided by the embodiment, the radiator is tested through ion precipitation, the radiator with qualified ion precipitation rising rate is carried on the vehicle, and the economical problem caused by frequent replacement of the cooling liquid in a set replacement period and the safety problem caused by over standard conductivity are avoided.
Example 2
The invention provides a deionized water circulation simulation system, which is used for implementing the radiator test method and comprises a circulation simulation component 3, an environment bin 2 and an ion concentration detection device 4; the circulation simulation component 3 comprises a driving device 31 and a kettle body 32 for containing deionized water, which are communicated through a pipeline, and an inlet 11 and an outlet 12 of the radiator 1 are connected in series with the circulation simulation component 3 to form a deionized water circulation loop; radiator 1 sets up in the installation cavity in environment storehouse 2, and environment storehouse 2 is used for simulating different environmental parameters such as ambient temperature, can realize the operating mode simulation of radiator 1 under the different conditions. The ion concentration detection device 4 is arranged on the deionized water circulation loop and used for detecting the conductivity of the deionized water circulation loop. Each component in the deionized water circulation simulation system basically has no ion output, the rising rate K of the conductivity is obtained by measuring the initial conductivity a of the deionized water in the deionized water circulation simulation system and the actual conductivity b after the set time t, and then the ion precipitation condition of the radiator 1 to be detected is evaluated.
In order to simulate different actual conditions of the radiator 1 mounted on the fuel cell vehicle, in this embodiment, the deionized water circulation simulation system further includes a heating device 5 disposed in the deionized water circulation loop, and configured to heat deionized water, so as to simulate different working water temperatures of deionized water, and make a measurement result more real. Preferably, the heating device 5 is a PTC.
In order to control the operation and stop of the heating device 5 and monitor the working water temperature of the deionized water, in this embodiment, the deionized water circulation simulation system further includes a temperature detection device 6 disposed in the deionized water circulation loop for detecting the deionized water temperature of the deionized water circulation loop.
In order to facilitate the determination of the elimination condition of the deionized water bubbles more intuitively and accurately, in the embodiment, the deionized water circulation simulation system further comprises a pressure detection device 7 arranged in the deionized water circulation loop and used for detecting the water pressure of the deionized water circulation loop, and in the process of discharging the bubbles, the early-stage water pressure changes obviously, and the later-stage water pressure close to the tail sound tends to be stable and changes less.
In order to realize precise control and intelligent control, in this embodiment, the deionized water circulation simulation system further includes a control unit 9, and the control unit 9 is electrically connected to the above components.
In the deionized water circulation simulation system provided by the invention, the driving device 31 generally adopts a water pump, different water pump rotating speeds represent different flow rates of deionized water, and generally, the flow of the deionized water can be obtained through the rotating speed of the water pump and parameters of the water pump. In order to monitor the flow rate of the deionized water in the deionized water circulation loop more intuitively, in this embodiment, the deionized water circulation simulation system further includes a flow detection device 8 disposed in the deionized water circulation loop.
The heat sink testing method of example 1 is described below in conjunction with the deionized water circulation simulation system of example 2 with a specific test example:
static test: n L deionized water is injected into the whole deionized water circulation loop, the control unit 9 controls the water pump to run at a low speed, the pressure detection device 7 observes the water pressure and discharges bubbles in the deionized water, the temperature of the environmental chamber 2 is adjusted to 25 ℃, the ion concentration detection device 4 tests the conductivity of the deionized water in the pipeline at the moment, and the initial conductivity a is obtained
And (3) controlling the deionized water circulation simulation system to stand for a set time t, operating the water pump, testing the actual conductivity b of the deionized water in the pipeline at the moment through the ion concentration detection device 4, and calculating to obtain the rising rate K.
When a plurality of groups of tests are carried out, the temperature distribution of the environmental chamber 2 in different groups is adjusted to t1 which is 5 ℃/15 ℃/35 ℃/45 ℃, and the tests are carried out according to the steps; static conductivity changes at different ambient temperatures can be evaluated.
Dynamic test: n L deionized water is injected into the whole deionized water circulation loop, the control unit 9 controls the water pump to run at a low speed, the pressure detection device 7 is used for observing water pressure and discharging bubbles in the deionized water, the temperature of the environmental chamber 2 is adjusted to 25 ℃, the ion concentration detection device 4 is used for testing the conductivity of the deionized water in the pipeline at the moment to obtain initial conductivity a, the PTC is controlled for heating the water temperature in the loop to 75 ℃ of the optimal working water temperature of the galvanic pile, the water pump is controlled to run at the rotating speed of 1000rpm for a set time t, the ion concentration detection device 4 is used for testing the actual conductivity b of the deionized water in the pipeline at the moment, and the rising rate K is calculated.
The water pump rotation speed is sequentially adjusted to 2000/3000/4000/5000rpm, and the experiment is repeated; dynamic conductivity changes at different flow rates can be evaluated. In addition, in the dynamic test, the environment temperature or the working water temperature can be used as variables, and the test can be repeated or a plurality of groups of tests under different simulation working conditions can be carried out simultaneously.
While the preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A heat radiator testing method is characterized by comprising the following steps:
(1) communicating the radiator with a deionized water circulation simulation system; injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate at a set environmental temperature so as to discharge bubbles in the deionized water, and measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, wherein the conductivity is marked as initial conductivity a;
(2) controlling the deionized water circulation simulation system to be in a set state at the set environmental temperature in the step (1), and measuring the actual conductivity b of the deionized water circulation simulation system after a set time t;
(3) calculating the rising rate K of the conductivity by the formula (b-a)/t; and determining whether the radiator is qualified or not according to the rising rate K.
2. The heat sink testing method according to claim 1, wherein in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically comprises: and controlling the deionized water circulation simulation system to stand and/or operate within a set time t.
3. The heat sink testing method according to claim 2, wherein in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically comprises: and heating the deionized water in the deionized water circulation simulation system to a set working water temperature, and controlling the deionized water circulation simulation system to constantly operate for the set time t under a set working condition.
4. The heat sink testing method according to claim 2, wherein in the step (2), controlling the deionized water circulation simulation system to be in a set state specifically comprises: controlling the deionized water circulation simulation system to stand for the set time t;
in the step (3), if it is determined that the heat sink is qualified, the heat sink testing method further includes: (4) dynamic verification:
(4-1) injecting deionized water into the deionized water circulation simulation system, controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water at a set environmental temperature, measuring the conductivity of the deionized water in the deionized water circulation simulation system after the bubbles are discharged, and marking as a second initial conductivity c;
(4-2) heating the deionized water in the deionized water circulation simulation system to a set working water temperature at the ambient temperature set in the step (4-1), controlling the deionized water circulation simulation system to continuously operate, and measuring a second actual conductivity d of the deionized water circulation simulation system after a set time t 1;
(4-3) calculating a rising rate K of the conductivity by the formula (d-c)/t 1; and verifying whether the radiator is qualified or not according to the rising rate K.
5. The heat sink testing method of claim 3 or 4, further comprising repeating steps (1) - (3) and changing at least one of the ambient temperature, the operating water temperature, and the flow rate of the deionized water.
6. The heat sink testing method according to any one of claims 1 to 4, wherein in the step (1), controlling the deionized water circulation simulation system to operate to discharge bubbles in the deionized water specifically comprises:
and controlling the deionized water circulation simulation system to continuously operate, detecting the water pressure change of the deionized water circulation simulation system in real time in the operation process, and judging that the bubbles in the deionized water are completely discharged when the water pressure change is smaller than a set threshold value.
7. The heat sink testing method according to any one of claims 1 to 4, wherein in the step (3), determining whether the heat sink is qualified according to the rising rate K specifically comprises: and comparing the rising rate K with a set rate Ks, and if K is less than or equal to Ks, determining that the radiator is qualified.
8. The heat sink testing method according to any one of claims 1-5, wherein the set rate Ks is (α 2- α 1)/5000h, α 2 is 8 μ s/cm, α 1 is 0.5 μ s/cm;
and determining whether the radiator is qualified or not according to the rising rate K, wherein the method specifically comprises the steps of comparing the sizes of a and alpha 1 and the sizes of b and alpha 2, and if a is less than or equal to alpha 1, b is less than or equal to alpha 2, and Kd is less than or equal to Ks, determining that the radiator is qualified.
9. A deionized water circulation simulation system for implementing the heat sink testing method of any one of claims 1 to 8, comprising:
the environment bin is provided with a mounting cavity for accommodating the radiator and is used for simulating different environment parameters;
the circulation simulation assembly comprises a driving device and a kettle body for containing deionized water, which are communicated through a pipeline, and the radiator is connected in series with the circulation simulation assembly to form a deionized water circulation loop;
and the ion concentration detection device is arranged on the deionized water circulating loop and is used for detecting the conductivity of the deionized water circulating loop.
10. The deionized water circulation simulation system of claim 9, further comprising,
the heating device is arranged in the deionized water circulating loop and used for heating the deionized water;
the temperature detection device is arranged on the deionized water circulation loop and is used for detecting the temperature of the deionized water in the deionized water circulation loop;
the pressure detection device is arranged in the deionized water circulation loop and used for detecting the water pressure of the deionized water circulation loop;
and the flow detection device is arranged in the deionized water circulating loop and is used for detecting the flow of the deionized water in the deionized water circulating loop.
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| CN202210748817.1A CN115127845A (en) | 2022-06-28 | 2022-06-28 | Radiator testing method and deionized water circulation simulation system |
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