CN111735635A - Cold flow backpressure test bench and cold flow backpressure test method of post-processor - Google Patents
Cold flow backpressure test bench and cold flow backpressure test method of post-processor Download PDFInfo
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- CN111735635A CN111735635A CN202010743338.1A CN202010743338A CN111735635A CN 111735635 A CN111735635 A CN 111735635A CN 202010743338 A CN202010743338 A CN 202010743338A CN 111735635 A CN111735635 A CN 111735635A
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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
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/106—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using pressure sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
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Abstract
The invention discloses a cold flow backpressure test bench and a cold flow backpressure test method of a post-processor. The distance meter feeds back the corresponding length information to the control cabinet, the control cabinet automatically identifies the type of the post-processor according to the received weight information and the length information, automatically selects and derives the flow value matched with the post-processor to be tested, a tester can test only by clicking, and does not need to manually input corresponding information on the control cabinet, so that the operation process is simplified, the phenomenon that the wrong test result is obtained because the wrong information is input by a worker is avoided, the influence of human factors is avoided, and the risk of errors is further reduced.
Description
Technical Field
The invention relates to the technical field of backpressure test of a vehicle postprocessor, in particular to a cold flow backpressure test bench and a cold flow backpressure test method of the postprocessor.
Background
The vehicle postprocessor is used as a key part of the engine and arranged in an exhaust system of the engine to convert harmful substances in tail gas into N harmless to the environment2、CO2And H2O, etc. to reduce the emission of harmful gas and reduce environmental pollution.
The back pressure of the post-processor is a key index influencing the performance of the post-processor, the back pressure of the post-processor is positively correlated with the power loss of the engine, and the power loss of the engine is directly influenced, so that the post-processor which leaves a factory needs to meet the requirement of a rated back pressure value. At present, a host factory or a part supplier generally adopts an engine bench mode to measure the back pressure of a post-processor, the post-processor is arranged at the exhaust end of an engine, and the back pressure parameter of the post-processor under the corresponding condition is tested by adjusting the operation condition of the engine; because engine pedestal equipment is more expensive, the pedestal of engine is built and is needed to spend longer time, therefore cost of labor, test cost are higher, and the test mode of engine pedestal is complicated moreover, and test duration is longer.
At present, the cold flow backpressure test bench is adopted to carry out backpressure test on the postprocessor, but the existing cold flow backpressure test bench has the following problems: (1) the existing cold flow backpressure test bench generally needs to manually input a corresponding flow value in a control cabinet according to parameters such as the actual size, the weight and the like of a post-processor after the post-processor is installed on the bench, and in the process of manual operation, misoperation conditions such as flow information input errors and the like are easy to occur. (2) A pressure stabilizing device is not usually arranged on a test pipeline of the existing cold flow backpressure test bench, test data generates large fluctuation due to airflow disorder, and the stability of the test data is poor. (3) The temperature, the humidity and the like of the test environment of the existing cold flow backpressure bench are generally not specially regulated and controlled, and the temperature and the humidity of the environment have great influence on the backpressure of the post processor, so that the accuracy of test data is greatly influenced.
Disclosure of Invention
The cold flow backpressure test bench and the cold flow backpressure test method of the post processor are reasonable in structure, the risk of error is reduced, the stability of test data is improved, the temperature and the humidity of the bench environment are regulated, and the accuracy of the test data is guaranteed.
The technical scheme adopted by the invention is as follows:
a cold flow backpressure test bench comprises a control cabinet and a cold flow fan connected with the control cabinet, wherein a test bench is connected with the cold flow fan through a pipeline, a pressure sensor is respectively arranged at the air inlet end and the air outlet end of the test bench, a weighing device and a distance meter are also arranged on the test bench, and the weighing device and the distance meter are connected with the control cabinet; when the post processor is installed on the test bench, the weighing device can weigh the post processor and feed back information to the control cabinet, and the distance measuring instrument can measure the length and the size of the post processor and feed back the information to the control cabinet.
The test bench is provided with the weighing device and the range finder, the weighing device feeds corresponding weight information back to the control cabinet, the range finder feeds corresponding length information back to the control cabinet, the control cabinet automatically identifies the type of the post-processor according to the received weight information and length information, and automatically selects and derives a flow value matched with the post-processor to be tested, a tester can test the post-processor only by clicking, and does not need to manually input corresponding information on the control cabinet, so that the operation process is simplified, wrong test results obtained by manual work due to input of wrong information are avoided, the influence of human factors is avoided, and further the risk of errors is reduced.
As a further improvement of the above technical solution:
the pipeline is provided with a flow stabilizer, and the flow stabilizer is provided with an air inlet and an air outlet; a flow guide plate and a pore plate are arranged in the flow stabilizer, an expansion cavity, a mixing cavity and a contraction cavity are sequentially formed, a plurality of blade holes are formed in the flow guide plate, and blades opening towards the mixing cavity are arranged on the blade holes; the pore plate is provided with a plurality of through holes.
The opening direction of the blades in each quarter area on the guide plate is centrosymmetric.
The flow stabilizer is used for adjusting turbulent airflow, providing stable airflow for the post processor and ensuring the accuracy of post processor testing.
The test bench is provided with at least two test channels, each test channel is provided with a test station, each test station is connected to the main pipeline through a shunt branch pipe, and the main pipeline is connected to the cold flow fan.
The invention can carry out backpressure test on a plurality of post-processors through a plurality of test channels, thereby saving test time and improving test efficiency.
A first flowmeter, a pressure release valve and a first throttle valve are arranged on the main pipeline
And a second throttle valve, a flow stabilizer, a second flowmeter and a first temperature sensor are arranged on one side of the air inlet end of each branch pipe, and a second temperature sensor is arranged on one side of the air outlet end of each branch pipe.
And a check valve is also arranged on each branch flow dividing pipe and between the second throttling valve and the flow stabilizing device.
According to the invention, the check valve is arranged on each branch flow dividing pipe and between the second throttling valve and the flow stabilizing device, so that the phenomenon that local pressure in the pipeline is overlarge due to turbulent airflow backflow formed when the second throttling valve is opened and closed is prevented, and double insurance is formed together with the pressure release valve, and the phenomenon that the airflow pressure in the pipeline is overlarge to cause danger is avoided.
The test bench is arranged in a test chamber, and a plurality of air inlets and air outlets are arranged in the test chamber; during testing, the air conditioner adjusts the ambient temperature and humidity in the testing chamber through the air inlet and the air outlet.
The test bench is arranged in the test chamber, the test chamber is internally provided with a plurality of air inlets and air outlets communicated with the air conditioner, the air conditioner can adjust the environmental temperature and humidity in the test chamber through the air inlets and the air outlets, the temperature and the humidity of the test environment are kept within a certain value range in the test process, the influence on the backpressure test result caused by overlarge temperature and humidity change is avoided, and the accuracy of backpressure test data is ensured.
A post-treatment cold flow backpressure test method adopts the cold flow backpressure test bench and comprises the following steps:
s1, collecting standard back pressure data, wherein the standard back pressure data is delta P0Obtaining from a plurality of standard post-processor samples, verifying the heat flow backpressure of the selected samples, testing the cold flow backpressure of the samples after the requirements are met, and taking the cold flow backpressure data meeting the requirements as standard backpressure data delta P0；
S2, performing a cold flow backpressure test, namely mounting the post processor on a cold flow backpressure test bench to perform the cold flow backpressure test, recording pressure values of an air inlet end and an air outlet end, and calculating to obtain a cold flow backpressure value delta P;
s3, judging the test result, and comparing the cold flow backpressure value delta P obtained by the test with the standard backpressure data delta P0Comparing to obtain absolute value | D of difference value between the two0I, will | D0And comparing | with a set value for judgment.
According to the post-processor cold flow backpressure test method, the cold flow backpressure test is performed on the sampling sample on the mass production line, so that the production consistency of mass production products can be verified, and the quality of the mass production products is guaranteed. The standard backpressure data are acquired on the sample which meets the hot flow backpressure verification and the cold flow backpressure verification at the same time, the acquired standard backpressure data are closer to the actual cold flow backpressure value, the actual cold flow backpressure of the product can be reflected better, the accuracy is guaranteed better, the standard backpressure data are used as the reference value of the cold flow backpressure test of the sampled product, and the test reliability of the sampled product is improved.
As a further improvement of the above technical solution:
before the post-processor is subjected to a cold flow backpressure test, the post-processor is subjected to airtightness detection.
The method and the device carry out air tightness detection on the post-processor to be tested, and avoid the influence of gas leakage points on the cold flow backpressure test result of the post-processor.
The invention has the following beneficial effects:
the test bench is provided with the weighing device and the range finder, the weighing device feeds corresponding weight information back to the control cabinet, the range finder feeds corresponding length information back to the control cabinet, the control cabinet automatically identifies the type of the post-processor according to the received weight information and length information, and automatically selects and derives a flow value matched with the post-processor to be tested, a tester can test the post-processor only by clicking, and does not need to manually input corresponding information on the control cabinet, so that the operation process is simplified, wrong test results obtained by manual work due to input of wrong information are avoided, the influence of human factors is avoided, and further the risk of errors is reduced.
The flow stabilizer is used for adjusting turbulent airflow, providing stable airflow for the post processor and ensuring the accuracy of post processor testing.
The invention can carry out backpressure test on a plurality of post-processors through a plurality of test channels, thereby saving test time and improving test efficiency.
According to the invention, the check valve is arranged on each branch flow dividing pipe and between the second throttling valve and the flow stabilizing device, so that the phenomenon that local pressure in the pipeline is overlarge due to turbulent airflow backflow formed when the second throttling valve is opened and closed is prevented, and double insurance is formed together with the pressure release valve, and the phenomenon that the airflow pressure in the pipeline is overlarge to cause danger is avoided.
The test bench is arranged in the test chamber, the test chamber is internally provided with a plurality of air inlets and air outlets communicated with the air conditioner, the air conditioner can adjust the environmental temperature and humidity in the test chamber through the air inlets and the air outlets, the temperature and the humidity of the test environment are kept within a certain value range in the test process, the influence on the backpressure test result caused by overlarge temperature and humidity change is avoided, and the accuracy of backpressure test data is ensured.
According to the post-processor cold flow backpressure test method, the cold flow backpressure test is performed on the sampling sample on the mass production line, so that the production consistency of mass production products can be verified, and the quality of the mass production products is guaranteed. The standard backpressure data are acquired on the sample which meets the hot flow backpressure verification and the cold flow backpressure verification at the same time, the acquired standard backpressure data are closer to the actual cold flow backpressure value, the actual cold flow backpressure of the product can be reflected better, the accuracy is guaranteed better, the standard backpressure data are used as the reference value of the cold flow backpressure test of the sampled product, and the test reliability of the sampled product is improved.
The method and the device carry out air tightness detection on the post-processor to be tested, and avoid the influence of gas leakage points on the cold flow backpressure test result of the post-processor.
Drawings
FIG. 1 is a schematic diagram of a test bench according to the present invention.
Fig. 2 is a cross-sectional view of a flow stabilizer.
Fig. 3 is a perspective view of a baffle.
Fig. 4 is a perspective view of an orifice plate.
FIG. 5 is a flow chart of the test method of the present invention.
Fig. 6 is a flow chart of standard backpressure data acquisition.
In the figure: 1. a control cabinet; 2. a cold flow fan; 3. a post-processor; 4. a hygrometer; 5. an ambient temperature sensor; 6. a first flow meter; 7. a pressure relief valve; 8. a first throttle valve; 9. a second throttle valve; 10. a flow stabilizer; 101. an air inlet; 102. an air outlet; 103. a baffle; 1031. a blade hole; 1032. a blade; 104. an orifice plate; 1041. a through hole; 105. an expansion lumen; 106. a mixing chamber; 107. a contracting cavity; 11. a second flow meter; 12. a first pressure sensor; 13. a first temperature sensor; 14. a weighing device; 15. a range finder; 16. a second temperature sensor; 17. a second pressure sensor; 18. an air inlet and an air outlet; 19. a main pipeline; 20. a branch pipe;
30. a test station;
100. and a test chamber.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the cold flow backpressure test stand of the invention is provided with at least two test channels, each test channel is provided with a test station 30 for connecting with a post-processor 3 to be tested, the post-processor 3 is placed on the test station 30 and then connected to a main pipe 19 through a branch pipe 20, the main pipe 19 is connected with a cold flow fan 2, the cold flow fan 2 is connected with a control cabinet 1 through a line, the control cabinet 1 controls the on and off of the cold flow fan 2 through received information, cold air flow is provided for the post-processor 3 on each test channel through the main pipe 19 and the branch pipe 20, and cold flow backpressure test is performed on the post-processor 3. The invention can carry out backpressure test on a plurality of post-processors 3 through a plurality of test channels, thereby saving test time and improving test efficiency.
As shown in fig. 1, the main pipe 19 is sequentially provided with a first flowmeter 6, a pressure relief valve 7 and a first throttle valve 8; the first flowmeter 6 is used for detecting the air flow of the main pipeline 19, monitoring the air flow condition of the main pipeline 19 and timely knowing whether the main pipeline 19 and each branch shunting pipe 20 have abnormal air flow; the pressure release valve 7 is used for discharging gas when the pressure in the pipeline is too high, so that the danger caused by the too high pressure of gas flow in the pipeline is avoided; the first throttle 8 is used for controlling the on-off of the main pipeline 19. A second throttle valve 9, a flow stabilizer 10, a second flowmeter 11, a first pressure sensor 12 and a first temperature sensor 13 are sequentially arranged on one side of the air inlet end of the postprocessor 3 on each branch pipe 20, and a second temperature sensor 16 and a second pressure sensor 17 are sequentially arranged on one side of the air outlet end of the postprocessor 3; the second throttle valve 9 is used for controlling the on-off of the branch pipe 20; the flow stabilizer 10 is used for adjusting the disordered airflow, providing stable airflow for the post-processor 3 and ensuring the accuracy of the test of the post-processor 3; the second flowmeter 11 is configured to detect an air flow rate of the branch pipes 20, monitor an air flow condition of each branch pipe 20, and timely know whether the monitored air flow of the branch pipe 20 is abnormal; the first pressure sensor 12 and the second pressure sensor 17 are used for detecting pressure values of an air inlet end and an air outlet end of the post-processor 3, and back pressure data of the post-processor 3 is obtained through comparison of the pressure values of the air inlet end and the air outlet end; the first temperature sensor 13 and the second temperature sensor 16 are used for detecting the airflow temperature values of the air inlet end and the air outlet end of the post-processor 3, monitoring the temperature condition of the airflow passing through the post-processor 3, timely knowing whether the airflow temperature is abnormal or not and avoiding collecting inaccurate backpressure data. In other embodiments, a check valve may be further disposed on each branch flow path 20 between the second throttling valve 9 and the flow stabilizer 10 to prevent the turbulent airflow generated when the second throttling valve 9 is opened and closed from flowing back to cause an excessive local pressure inside the pipeline, so as to form a double safety with the pressure relief valve 7 to avoid a danger caused by an excessive pressure of the airflow in the pipeline.
The test bench 30 of each branch pipe 20 is also provided with a weighing device 14 and a distance meter 15, the weighing device 14 and the distance meter 15 are connected to the control cabinet 1 through lines, and the weighing device 14 is used for weighing the post-processor 3 to be tested and feeding corresponding weight information back to the control cabinet 1; the distance measuring instrument 15 is used for measuring the length size of the post-processor 3 to be tested and feeding back corresponding length information to the control cabinet 1; the control cabinet 1 automatically identifies the type of the post-processor 3 according to the received weight information and length information, automatically selects and derives a flow value matched with the post-processor 3 to be tested, a tester can test only by clicking, and does not need to manually input corresponding information on the control cabinet 1, so that the operation process is simplified, the problem that the wrong test result is obtained because of inputting wrong information by a worker is avoided, the influence of human factors is avoided, and the error risk is reduced.
As shown in fig. 1, the cold flow backpressure test bench of the present invention is disposed in a test chamber 100, a plurality of air inlets and air outlets 18 communicated with an air conditioner are disposed in the test chamber 100, and the air conditioner can adjust the ambient temperature and humidity in the test chamber 100 through the air inlets and air outlets 18; be provided with hygrometer 4, ambient temperature sensor 5 on the switch board 1, can survey humidity, the temperature in the test room 100 in real time, in time know the temperature, the humidity condition in the test room 100 to carry out corresponding regulation according to the demand. In the testing process, the temperature in the testing chamber 100 is controlled to be 25 +/-2 ℃, and the humidity is controlled to be 50-60%, so that the temperature and the humidity of the testing environment are kept within a certain value range in the testing process, the influence on the backpressure testing result caused by overlarge temperature and humidity changes is avoided, and the accuracy of backpressure testing data is ensured.
As shown in fig. 2, two end portions of the cylinder of the flow stabilizer 10 are cone cylinder portions, the middle portion is a cylinder portion, one end of the cone cylinder portion is provided with an air inlet 101, the other end of the cone cylinder portion is provided with an air outlet 102, one end of the cylinder portion, which is positioned at the air inlet 101, is fixedly provided with a flow guide plate 103, one end of the cylinder portion, which is positioned at the air outlet 102, is fixedly provided with a pore plate 104, an expansion cavity 105 is formed inside the flow stabilizer 10 and positioned at the front side of the flow guide plate 103, a mixing cavity 106 is formed between the flow guide plate 103 and the pore plate 104, a contraction cavity 107 is formed at the rear side of the pore plate 104. As shown in fig. 3, a plurality of blade holes 1031 arranged in an array are formed in the plate surface of the baffle plate 103, each blade hole 1031 is provided with a blade 1032, and as shown in fig. 2, the plurality of blades 1032 open toward the mixing chamber 106; as shown in fig. 3, the opening directions of the vanes 1032 in each quarter of the plate surface of the baffle plate 103 are arranged in a central symmetry. As shown in fig. 4, the plate surface of the orifice plate 104 is provided with a plurality of through holes 1041 in a staggered manner. Turbulent air flow enters the expansion cavity 105 of the flow stabilizer 10 from the air inlet 101, the flow rate of the turbulent air flow is reduced, then the turbulent air flow enters the mixing cavity 106 through the plurality of blade holes 1031 of the guide plate 103, the air flow rotates under the guide action of the plurality of blades 1032, the turbulent air flow is rotated and mixed in the mixing cavity 106, the air flow with uniform flow rate is obtained, the uniform air flow stably enters the contraction cavity 107 through the plurality of through holes 1041 of the pore plate 104, after the flow rate is increased in the contraction cavity 107, the turbulent air flow is output from the air outlet 102, and the stable air flow with the flow rate meeting the requirement is obtained.
When the cold flow backpressure test bench is used for carrying out cold flow backpressure test on the postprocessor 3, corresponding data information is input into a database of the control cabinet 1, the postprocessor 3 to be tested is installed on the test bench 30 of the branch flow pipe 20, weight information of the postprocessor 3 automatically detected by the weighing device 14 on the test bench 30 is fed back to the control cabinet 1, length size of the postprocessor 3 automatically detected by the distance meter 15 is fed back to the control cabinet 1, the control cabinet 1 matches and displays a required flow value according to the received information, a tester confirms that clicking starts, the control cabinet 1 controls the cold flow fan 2 to start, the first throttle valve 8 on the main pipe 19 is opened, the second throttle valve 9 on the corresponding branch flow pipe 20 is opened, airflow of the cold flow fan 2 enters the postprocessor 3 after being regulated stably by the flow stabilizer 10, and after data are stabilized, the first pressure sensor 12 is recorded, The difference between the pressure values of the second pressure sensor 17 and the pressure values is the cold flow backpressure data of the post-processor 3.
As shown in fig. 5, the cold flow backpressure test bench of the present invention can be used for performing a cold flow backpressure test on the post-processor 3, the test method is applied to a mass production stage of the post-processor 3, and the cold flow backpressure test is performed on mass production products to verify the production consistency of the mass production products, and the specific steps are as follows:
step S1: collecting standard backpressure data;
step S2: cold flow backpressure test;
step S3: and (6) judging the test result.
After the test is performed according to the steps, the obtained test result is compared with standard backpressure data: (1) if the difference value between the test result and the standard backpressure data is smaller than or equal to the set value, the backpressure of the post-processor 3 is qualified, and the production consistency requirement of the product is met; (2) if the difference value between the test result and the standard backpressure data is larger than the set value, the backpressure of the post-processor 3 is unqualified, a burner rack heat flow test needs to be carried out on the post-processor 3, the verification is further carried out, if the test result of the burner rack test meets the requirement, the backpressure of the post-processor 3 is judged to be qualified, and the production consistency requirement of the product is met; otherwise, the processor is determined to be unqualified, and further design scheme inspection and/or disassembly detection are required to be carried out on the post-processor 3 to find out the root cause.
Step S1, first, the standard back pressure data Δ P of the post-processor 3 needs to be collected0And the acquired information such as the standard backpressure data, the weight information and the length information of the selected sample piece and the like is input into a database of the control cabinet 1 of the cold flow backpressure test bench and is used for operations such as identification reference of the control cabinet 1 to the post-processor 3 to be tested, matching of flow values and the like.
The flow of acquiring standard backpressure data is shown in fig. 6, and mainly includes the following steps:
1) firstly, selecting 5-10 sample pieces from a standard post-processor 3 product;
2) carrying out heat flow backpressure verification on the sample piece on a combustor heat flow rack, and actually measuring to obtain heat flow backpressure data of each sample piece at a rated working condition point by adopting the same flow and temperature as those of the engine data at the rated working condition point;
3) comparing the heat flow backpressure data of each sample piece with each other, if the difference value between the heat flow backpressure data of each sample piece is less than 1kpa, performing the next operation on each sample piece, otherwise, performing airtightness detection, and/or design scheme inspection, and/or disassembly inspection on the sample pieces;
4) after the heat flow backpressure data of each sample meet the requirements, performing cold flow backpressure test on each sample to obtain the cold flow backpressure data of each sample, and if the difference value between the cold flow backpressure data of each sample is less than 1kpa, taking the average value of the cold flow backpressure data of all samples as standard backpressure data delta P0The standard backpressure data acquisition is finished; otherwise, the air tightness of the sample piece needs to be detected, and/or the design scheme needs to be checked, and/or the sample piece needs to be disassembled for checking.
Standard backpressure data Δ P of the invention0The standard backpressure data are acquired on the sample piece which meets the hot flow backpressure verification and the cold flow backpressure verification simultaneously, the acquired standard backpressure data are closer to the actual cold flow backpressure value, the actual cold flow backpressure value of a product can be reflected, the accuracy is guaranteed, the standard backpressure data are used for the reference value of the cold flow backpressure test of the sampled product, and the sampled product is improvedThe test reliability of (2).
After the standard backpressure data collection in the step S1 is completed, before the step S2 is performed, the air tightness of the post-processor 3 to be tested, which is obtained by sampling on a mass production line, is detected, so as to prevent the post-processor 3 from having an air leakage point to influence the result of the cold flow backpressure test. And if the air tightness of the post-processor 3 to be tested meets the requirement, performing the next operation, otherwise, detecting the leakage point on the post-processor 3 to be tested, replacing the sealing gasket and the like, and then performing the air tightness detection verification again.
Step S2, performing a cold flow back pressure test on the post-processor 3 satisfying the airtightness detection, which mainly includes the following steps:
1) mounting a post-processor 3 to be tested on a test bench 30 of one of the branch pipes 20 of the cold flow backpressure test bench, feeding back weight information of the post-processor 3 to the control cabinet 1 by a weighing device 14 on the test bench 30, and feeding back the length size of the post-processor 3 to the control cabinet 1 by a distance meter 15;
2) the control cabinet 1 automatically selects a flow value matched with the post-processor 3 to be tested according to the received information, and the tester starts the cold flow fan 2 after confirming the flow value, and opens the first throttle valve 8 on the main pipeline 19 and the second throttle valve 9 on the corresponding branch pipeline 20;
3) checking the states of instruments and meters on the main pipeline 19 and the branch pipeline 20, and if the instruments and meters are normal, performing the next step; if the instruments and meters are abnormal, the cold flow fan 2 needs to be restarted, and then the states of the instruments and meters are rechecked;
4) after the data on each instrument and meter are stabilized for about 3 minutes, the pressure value P on the first pressure sensor 12 at the air inlet end of the post-processor 3 is recorded1And a pressure value P on the second pressure sensor 17 at the air outlet end2，P2Minus P1And calculating to obtain a cold flow back pressure value delta P of the post-processor 3.
Step S3, comparing the cold flow backpressure Δ P measured in step S3 with the standard backpressure data Δ P0Comparing the two values to obtain absolute value | D of difference value0For | D0And I, judging, wherein the judgment requirement is as follows: 1) i D0The | < 1kpa, is qualified, meets the production consistency, and ends the test; 2) i D0If the value is greater than 1kpa, the heat flow is unqualified, the post-processor 3 is further subjected to a burner rack heat flow test, and the further judgment is carried out according to the heat flow test result.
According to the post-processor cold flow backpressure test method, the cold flow backpressure test is performed on the sampling sample on the mass production line, so that the production consistency of mass production products can be verified, and the quality of the mass production products is guaranteed.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.
Claims (10)
1. The utility model provides a cold flow backpressure test bench, includes switch board (1), cold flow fan (2) be connected with switch board (1), and test bench position (30) are connected its characterized in that through pipeline and cold flow fan (2): the air inlet end and the air outlet end of the test bench (30) are respectively provided with a pressure sensor, the test bench (30) is also provided with a weighing device (14) and a distance meter (15), and the weighing device (14) and the distance meter (15) are connected with the control cabinet (1); when the post processor (3) is installed on the test bench (30), the weighing device (14) can weigh the post processor (3) and feed back information to the control cabinet (1), and the distance meter (15) can measure the length and the size of the post processor (3) and feed back information to the control cabinet (1).
2. The cold flow backpressure test rig of claim 1, wherein: a flow stabilizer (10) is arranged on the pipeline, and an air inlet (101) and an air outlet (102) are formed in the flow stabilizer (10); a flow guide plate (103) and a pore plate (104) are arranged in the flow stabilizer (10) to form an expansion cavity (105), a mixing cavity (106) and a contraction cavity (107) in sequence, a plurality of blade holes (1031) are formed in the flow guide plate (103), and blades (1032) which are opened towards the mixing cavity (106) are arranged on the blade holes (1031); the orifice plate (104) is provided with a plurality of through holes (1041).
3. The cold flow backpressure test rig of claim 2, wherein: the opening direction of the vanes (1032) in each quarter area of the guide plate (103) is in central symmetry.
4. The cold flow backpressure test rig of claim 1, wherein: the test bench sets up two at least test passageways, sets up a test bench position (30) on every test passageway, and every test bench position (30) are connected to on trunk line (19) through reposition of redundant personnel branch pipe (20), and trunk line (19) are connected to on cold flow fan (2).
5. The cold flow backpressure test rig of claim 4, wherein: the main pipeline (19) is provided with a first flowmeter (6), a pressure relief valve (7) and a first throttle valve (8).
6. The cold flow backpressure test rig of claim 4, wherein: and a second throttle valve (9), a flow stabilizer (10), a second flowmeter (11) and a first temperature sensor (13) are arranged on one side of an air inlet end of each branch pipe (20), and a second temperature sensor (16) is arranged on one side of an air outlet end of each branch pipe.
7. The cold flow backpressure test rig of claim 6, wherein: and a check valve is also arranged on each branch flow pipe (20) and between the second throttling valve (9) and the flow stabilizing device (10).
8. The cold flow backpressure test rig of claim 1, wherein: the test bench is arranged in the test chamber (100), and a plurality of air inlets and air outlets (18) are arranged in the test chamber (100); during testing, the air conditioner adjusts the ambient temperature and humidity in the testing chamber (100) through the air inlet and outlet (18).
9. A post-treatment cold flow backpressure test method is characterized in that: the cold flow backpressure test bench of any one of claims 1-8, comprising the steps of:
s1, collecting standard back pressure data, wherein the standard back pressure data is delta P0Obtaining from a plurality of standard post-processor (3) samples, verifying the heat flow backpressure of the selected samples, testing the cold flow backpressure of the samples after the requirements are met, and taking the cold flow backpressure data meeting the requirements as standard backpressure data delta P0；
S2, performing a cold flow backpressure test, namely mounting the post-processor (3) on a cold flow backpressure test bench to perform the cold flow backpressure test, recording pressure values of an air inlet end and an air outlet end, and calculating to obtain a cold flow backpressure value delta P;
s3, judging the test result, and comparing the cold flow backpressure value delta P obtained by the test with the standard backpressure data delta P0Comparing to obtain absolute value | D of difference value between the two0I, will | D0And comparing | with a set value for judgment.
10. The post-processing cold flow backpressure test method of claim 9, wherein: before the post-processor (3) is subjected to a cold flow backpressure test, the post-processor (3) is subjected to airtightness detection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834232A (en) * | 2021-01-04 | 2021-05-25 | 东风柳州汽车有限公司 | Heat flow exhaust backpressure detection method, device, equipment and storage medium |
| CN113250799A (en) * | 2021-05-25 | 2021-08-13 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834232A (en) * | 2021-01-04 | 2021-05-25 | 东风柳州汽车有限公司 | Heat flow exhaust backpressure detection method, device, equipment and storage medium |
| CN113250799A (en) * | 2021-05-25 | 2021-08-13 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
| CN113250799B (en) * | 2021-05-25 | 2023-03-03 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
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