CN113250799A - Backpressure data detection method, device and system - Google Patents
Backpressure data detection method, device and system Download PDFInfo
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- CN113250799A CN113250799A CN202110570058.XA CN202110570058A CN113250799A CN 113250799 A CN113250799 A CN 113250799A CN 202110570058 A CN202110570058 A CN 202110570058A CN 113250799 A CN113250799 A CN 113250799A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to the technical field of fuel vehicle post-processing, and particularly discloses a backpressure data detection method, which comprises the following steps: constructing an airflow flow-backpressure curve functional relation of the sample piece according to the backpressure value of the sample piece under the specified airflow flow, the airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected; acquiring an airflow flow value and a backpressure value of a product to be detected under a detection frequency; constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece; and calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected. The invention also discloses a backpressure data detection device and a backpressure data detection system. The backpressure data detection method provided by the invention can effectively improve backpressure detection efficiency.
Description
Technical Field
The invention relates to the technical field of fuel vehicle post-processing, in particular to a backpressure data detection method, a backpressure data detection device and a backpressure data detection system.
Background
With the development of the post-processing technology of the fuel vehicle, the three-way catalyst and the particle catcher are widely applied, and the back pressure of the three-way catalyst and the particle catcher has important influence on the performance of the whole fuel vehicle, so the back pressure of the product is an important parameter monitored by each main engine plant. The rapid and accurate detection of the backpressure data of the product is a technology which is urgently needed to be realized by each catalyst manufacturer.
The general requirements placed by the host plant on each catalyst supplier are: back pressure data of the particulate trap or three-way catalyst product is tested while maintaining a specified test gas flow rate. In the prior art, equipment capable of stabilizing airflow and keeping the airflow unchanged is of type 2, the first type is an air source generator technology capable of stabilizing the flow, but the equipment is expensive in manufacturing cost, low in detection efficiency and not suitable for large-scale detection, is only used in a laboratory or a professional detection mechanism at present and is used for a small amount of detection; the second type is that a fan or compressed air is used as an air source, and the air flow is stabilized at a specified value by dynamically adjusting the opening degree of the valve or the frequency of the fan, although the cost is reduced, the adjustment and stabilization time is longer, the air flow can be stabilized in about 1 minute or more, the detection efficiency is still lower, and the cost of mass detection is still higher.
Disclosure of Invention
The invention provides a backpressure data detection method, a backpressure data detection device and a backpressure data detection system, and solves the problems of low backpressure data detection efficiency and high cost in the related technology.
As a first aspect of the present invention, there is provided a backpressure data detection method, including:
constructing an airflow flow-backpressure curve functional relation of the sample piece according to the backpressure value of the sample piece under the specified airflow flow, the airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
acquiring an airflow flow value and a backpressure value of a product to be detected under a detection frequency;
constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece;
and calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
Further, the step of constructing a functional relationship between the airflow rate and the backpressure curve of the sample piece according to the backpressure value of the sample piece under the specified airflow rate and the airflow rate value after the frequency of the fan is changed, and determining the frequency after the frequency of the fan is changed as the detection frequency of the product to be detected includes:
recording the back pressure value and the fan running frequency of the sample piece under the specified airflow flow;
acquiring an airflow flow value and a back pressure value of a sample piece after the frequency of the fan is changed to a first frequency;
calculating an airflow flow-backpressure curve functional relation of the sample according to the backpressure value of the sample under the specified airflow flow and the airflow flow value and backpressure value of the sample under the first frequency;
and determining the first frequency as the detection frequency of the product to be detected.
Further, the airflow flow-back pressure curve function relationship is as follows:
wherein P represents the back pressure value of the sample piece, Q represents the flow rate of the air flow, and Q0Indicating a specified flow rate of gas, PSample 0Indicating that the flow rate of the sample piece passing through the air flow is Q0Back pressure value of time, QSample 1Indicating changing of windActual flow rate of gas through the sample after a first frequency f1, PSample 1Indicating that the fan frequency is a first frequency f1 and the airflow rate is QSample 1Sample backpressure value of time.
Further, the acquiring the airflow value and the back pressure value of the product to be detected at the detection frequency comprises:
recording the airflow flow value Q of the product to be tested under the detection frequency of the fan frequencyx1And a back pressure value Px1。
Further, the step of constructing an airflow flow-backpressure curve function relationship of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve function relationship of the sample piece includes:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequency according to the back pressure value calculation formulax1Back pressure value of (2) P'x1Comprises the following steps:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequencyx1Back pressure value of (2) P'x1Back pressure value P of product to be detected under detection frequencyx1The difference between the two is calculated by the following formula:
and calculating an approximate airflow flow and back pressure functional relation of the product to be detected according to the parallel relation:
wherein, PxRepresenting the back pressure value, Q, of the product to be measuredxRepresenting the airflow value of the product to be measured;
and taking the approximate airflow flow and back pressure functional relation of the product to be detected as the airflow flow-back pressure curve functional relation of the product to be detected.
Further, the calculating the back pressure value of the product to be measured under the specified airflow flow rate according to the airflow flow rate-back pressure curve function relationship of the product to be measured includes:
wherein, Px0Indicating the passage of the product to be measured through a specified flow rate Q0The back pressure value of time is approximated.
As another aspect of the present invention, there is provided a back pressure data detecting apparatus, comprising:
the first construction module is used for constructing an airflow flow-backpressure curve functional relation of the sample piece according to a backpressure value of the sample piece under a specified airflow flow, an airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
the acquisition module is used for acquiring an airflow value and a backpressure value of a product to be detected under a detection frequency;
the second construction module is used for constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece;
and the calculation module is used for calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
As another aspect of the present invention, there is provided a backpressure data detection system, including: the device comprises a detection table, a clamp, a fan, a pipeline, a flowmeter, a pressure sensor, a frequency converter and a control cabinet, wherein the clamp is positioned on the detection table and used for fixing a product or a sample piece to be detected;
the flowmeter is used for detecting the flow rate of the airflow circulating in the pipeline;
the pressure sensor is used for detecting pressure data of the pipeline;
the frequency converter is used for adjusting the frequency of the fan to change the flow;
the fan can convey airflow to a product to be detected or a sample piece fixed on the clamp through the pipeline;
the backpressure data detection device can detect and obtain a backpressure value of a product to be detected fixed on the clamp under a specified airflow flow rate.
Further, the control cabinet comprises a PLC controller.
The backpressure data detection method provided by the invention comprises the steps of selecting a sample product, measuring a backpressure value of the sample under the condition that the specified airflow flow passes, changing the frequency of a fan to change the airflow flow, measuring the backpressure and the flow value of the sample product, and constructing a sample airflow flow-backpressure relation function; and measuring the airflow flow and the backpressure value of the product to be measured under the same fan frequency, establishing an airflow flow-backpressure relation function corresponding to the product to be measured according to the airflow flow-backpressure relation function of the sample piece, and further calculating the backpressure value of the product to be measured under the specified airflow flow. The backpressure data detection method uses the fan as an air source, does not need to adjust air flow to a specified value, quickly calculates the backpressure value of a product under the specified air flow by collecting the backpressure of the product under the real-time flow, shortens the backpressure detection time of the product to be detected, improves the detection efficiency, and reduces the detection working hour and the energy consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a backpressure data detection method provided by the present invention.
Fig. 2 is a schematic diagram of a back pressure flow characteristic curve provided by the present invention.
Fig. 3 is a schematic structural diagram of a backpressure data detection system provided by the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a method for detecting backpressure data is provided, and fig. 1 is a flowchart of a method for detecting backpressure data according to an embodiment of the present invention, as shown in fig. 1, including:
s110, constructing a functional relation of an airflow flow-backpressure curve of the sample piece according to a backpressure value of the sample piece under a specified airflow flow, and the airflow flow value and the backpressure value after the frequency of the fan is changed, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
in the embodiment of the invention, the back pressure value and the fan running frequency of the sample piece under the specified airflow flow are recorded;
specifically, a sample is selected and placed on a clamp of a detection table for fixing, then a fan is started, and the frequency of a frequency converter is adjusted to f0Make the airflow flow steady at the specified airflow flow Q0Record the sample backpressure P at that timeSample 0。
Acquiring an airflow flow value and a back pressure value of a sample piece after the frequency of the fan is changed to a first frequency;
in particular, the frequency of the frequency converter is reduced or increased to a first frequency f1To change the air flow rate, and record the air flow rate Q passing through the sampleSample 1And a back pressure value PSample 1。
Calculating an airflow flow-backpressure curve functional relation of the sample according to the backpressure value of the sample under the specified airflow flow and the airflow flow value and backpressure value of the sample under the first frequency;
in the embodiment of the present invention, the airflow rate-back pressure curve function relationship is as follows:
wherein P represents the back pressure value of the sample piece, Q represents the flow rate of the air flow, and Q0Indicating a specified flow rate of gas, PSample 0Indicating that the flow rate of the sample piece passing through the air flow is Q0Back pressure value of time, QSample 1Representing the actual flow rate of air through the sample after changing the fan frequency to a first frequency f1, PSample 1Indicating that the fan frequency is a first frequency f1 and the airflow rate is QSample 1Sample backpressure value of time.
And determining the first frequency as the detection frequency of the product to be detected.
In an embodiment of the invention, the first frequency f is determined1To be testedThe frequency of detection of the product.
S120, acquiring an airflow value and a back pressure value of a product to be detected under a detection frequency;
specifically, recording the airflow flow value Q of a product to be tested under the detection frequency of the fan frequencyx1And a back pressure value Px1。
Fixing the product to be tested on the clamp of the test table, starting the fan to the frequency, recording the airflow Q passing through the product to be testedx1And a back pressure value Px1。
S130, constructing an airflow flow-backpressure curve function relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve function relation of the sample piece;
in the embodiment of the present invention, the method may specifically include:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequency according to the back pressure value calculation formulax1Back pressure value of (2) P'x1Comprises the following steps:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequencyx1Back pressure value of (2) P'x1Back pressure value P of product to be detected under detection frequencyx1The difference between the two is calculated by the following formula:
and calculating an approximate airflow flow and back pressure functional relation of the product to be detected according to the parallel relation:
wherein, PxRepresenting the back pressure value, Q, of the product to be measuredxIndicating the product to be testedThe flow rate value of (a);
and taking the approximate airflow flow and back pressure functional relation of the product to be detected as the airflow flow-back pressure curve functional relation of the product to be detected.
In particular, the amount of the solvent to be used,
s140, calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
The calculating the back pressure value of the product to be measured under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be measured comprises the following steps:
wherein, Px0Indicating the passage of the product to be measured through a specified flow rate Q0The back pressure value of time is approximated.
The backpressure data detection method provided by the embodiment of the invention comprises the steps of selecting a sample product, measuring a backpressure value of the sample under the condition that the sample passes a specified airflow flow, changing the frequency of a fan to change the airflow flow, measuring the backpressure and the flow value of the sample product, and constructing a sample airflow flow-backpressure relation function; and measuring the airflow flow and the backpressure value of the product to be measured under the same fan frequency, establishing an airflow flow-backpressure relation function corresponding to the product to be measured according to the airflow flow-backpressure relation function of the sample piece, and further calculating the backpressure value of the product to be measured under the specified airflow flow. The backpressure data detection method uses the fan as an air source, does not need to adjust air flow to a specified value, quickly calculates the backpressure value of a product under the specified air flow by collecting the backpressure of the product under the real-time flow, shortens the backpressure detection time of the product to be detected, improves the detection efficiency, and reduces the detection working hour and the energy consumption.
The following describes a specific implementation process of the backpressure data detection method provided by the present invention in detail with reference to fig. 2.
As shown in fig. 2, curve 1 and curve 2 represent characteristic curves of the fan operating at different frequencies, respectively, and curve 1 is defined as the fan operating at the frequencyRate f0The time wind pressure-flow characteristic region, curve 2 is the frequency f of the fan operation1The wind pressure-flow characteristic curve.
As shown in fig. 2, a curve 3 and a curve 4 are respectively the wind resistance characteristics of the pipeline when different products are detected, the curve 3 is specified as the wind resistance characteristic of the pipeline corresponding to the sample product, and the curve 4 is specified as the wind resistance characteristic corresponding to the product to be detected.
Before starting product detection, parameter calculation is carried out, a sample is selected and fixed on a clamp of a detection table, a fan is started, and the frequency of a frequency converter is adjusted to stabilize the airflow flow at a specified airflow flow Q0At this time, the fan operates at the intersection point a of curve 1 and curve 3 in fig. 2, and the fan operating frequency is defined as f0Recording the back pressure P of the sample product at the momentSample 0。
Reducing the frequency of the frequency converter to obviously change the airflow, operating the fan at the point B of the intersection point of the curve 2 and the curve 3 shown in the figure 2, and recording the operating frequency f of the fan at the moment1Flow rate Q of gas flow through the sampleSample 1And a back pressure value PSample 1According to point A (Q)0，PSample 0) And point B (Q)Sample 1，PSample 1) And (3) calculating a curve function of the straight line AB, namely a Q-P relation function of the sample piece:
wherein P represents the back pressure value of the sample piece, Q represents the flow rate of the air flow, and Q0Indicating a specified flow rate of gas, PSample 0Indicating that the flow rate of the sample piece passing through the air flow is Q0Back pressure value of time, QSample 1Representing the actual flow rate of air through the sample after changing the fan frequency to a first frequency f1, PSample 1Indicating that the fan frequency is a first frequency f1 and the airflow rate is QSample 1Sample backpressure value of time.
Determining a first frequency f1The frequency of the product to be detected. Fixing a product to be detected on a clamp of a detection table, and starting a fan to a frequency f1At the moment, the fan operates at the point C at the intersection of the curve 2 and the curve 4 in the graph 1Recording the flow rate Q of the air passing through the product to be measuredx1And back pressure value P'x1Calculating the flow Q of the sample piece through the Q-P relation function formula of the sample piecex1Back pressure value of (2) P'x1Comprises the following steps:
and then calculate out
Drawing a straight line parallel to AB from C according to the parallel relation, intersecting AQ0And D, calculating a function of a straight line CD, namely an approximate relation function of the airflow and the back pressure value of the product to be detected as follows:
wherein, PxRepresenting the back pressure value, Q, of the product to be measuredxAnd representing the airflow value of the product to be measured.
According to the formula, the specified airflow Q specified by the technical requirement of the product to be measured is directly calculated0Approximate back pressure value P ofx0Comprises the following steps:
point E in fig. 2 is Q for adjusting the fan frequency to make the airflow rate of the product to be measured pass through the specification0At the theoretical operating point of the fan, the back pressure value corresponding to the point E is the actual back pressure theoretically required to be detected by the product to be detected, and the back pressure difference value between the points D and E is the approximate back pressure value P calculated by the product to be detectedx0Deviation from the actual backpressure value.
In the embodiment of the invention, a plurality of sample pieces with backpressure distributed in a step mode are selectedA plurality of groups of function relations are established in advance, and sample piece flow-backpressure relation functions with similar flow are selected for calculation according to the actual flow of the product to be detected during detection, so that the backpressure calculation value P of the product to be detected can be effectively controlledx0The deviation from the actual value is in the control precision range, a method of adjusting the airflow flow to be stable at the required value and then collecting the product backpressure value is replaced, the detection time is shortened, the detection efficiency is improved, and the detection cost is reduced.
In addition, the backpressure data detection method provided by the invention can form embedded software to be embedded in the controller, the operation time can be ignored, and the actual detection beat and the frequency f of starting the fan1The time is relevant, the detection time is shortened to 10-20 seconds after verification compared with the mode of regulating the frequency of the fan to stabilize the airflow to a specified value, and the detection efficiency is improved by more than 3 times.
It should be noted that, in the embodiment of the present invention, the frequency of the fan is reduced to the frequency f1The same applies to f, as explained for the example1Greater than f0Where determining the detection frequency includes decreasing and increasing the fan frequency.
The backpressure data detection method provided by the embodiment of the invention is suitable for backpressure detection of three-way catalysts or particle catcher products for fuel vehicles, and can also be applied to other occasions using fans to detect the backpressure of products, so that the type of the applicable products is not limited.
As another embodiment of the present invention, there is provided a back pressure data detecting apparatus including:
the first construction module is used for constructing an airflow flow-backpressure curve functional relation of the sample piece according to a backpressure value of the sample piece under a specified airflow flow, an airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
an acquisition module for acquiring the airflow value and the backpressure value of the product to be detected under the detection frequency
The second construction module is used for constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece;
and the calculation module is used for calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
The specific working process of the backpressure data detection device provided by the embodiment of the invention can refer to the description of the backpressure data detection method, and is not described herein again.
As another embodiment of the present invention, there is provided a backpressure data detection system, as shown in fig. 3, including: the device comprises a detection table 10, a clamp 20, a fan 30, a pipeline 40, a flow meter 60, a pressure sensor 50, a frequency converter (not shown in the figure) and a control cabinet 70, wherein the clamp 20 is located on the detection table 10, the clamp 20 is used for fixing a product or sample to be detected, the fan 30 is connected to the clamp 20 through the pipeline 40, the flow meter 60 and the pressure sensor 50 are both arranged on the pipeline 40, the frequency converter is connected with the fan 30, the flow meter 60, the pressure sensor 50 and the frequency converter are all in communication connection with the control cabinet 70, and the control cabinet 70 comprises the backpressure data detection device;
the flow meter 60 is used for detecting the flow rate of the airflow circulating in the pipeline;
the pressure sensor 50 is used for detecting the pressure data of the pipeline;
the frequency converter is used for adjusting the frequency of the fan to change the flow;
the fan 30 can deliver air flow to the product or sample to be tested fixed on the clamp through the pipeline;
the backpressure data detection device can detect and obtain a backpressure value of a product to be detected fixed on the clamp under a specified airflow flow rate.
Preferably, the control cabinet 70 includes a PLC controller.
According to the backpressure data detection system provided by the embodiment of the invention, as the backpressure data detection device is adopted, a sample airflow flow-backpressure relation function can be constructed by selecting a sample product, measuring the backpressure value of the sample under the condition that the sample passes through the specified airflow flow, changing the frequency of the fan to change the airflow flow, and measuring the backpressure and the flow value of the sample product; and measuring the airflow flow and the backpressure value of the product to be measured under the same fan frequency, establishing an airflow flow-backpressure relation function corresponding to the product to be measured according to the airflow flow-backpressure relation function of the sample piece, and further calculating the backpressure value of the product to be measured under the specified airflow flow. The backpressure data detection method uses the fan as an air source, does not need to adjust air flow to a specified value, quickly calculates the backpressure value of a product under the specified air flow by collecting the backpressure of the product under the real-time flow, shortens the backpressure detection time of the product to be detected, improves the detection efficiency, and reduces the detection working hour and the energy consumption.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A backpressure data detection method, comprising:
constructing an airflow flow-backpressure curve functional relation of the sample piece according to the backpressure value of the sample piece under the specified airflow flow, the airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
acquiring an airflow flow value and a backpressure value of a product to be detected under a detection frequency;
constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece;
and calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
2. The method for detecting back pressure data according to claim 1, wherein the step of constructing a functional relation of an airflow flow-back pressure curve of the sample piece according to the back pressure value of the sample piece under the specified airflow flow and the airflow flow value after changing the frequency of the fan, and determining the frequency after changing the frequency of the fan as the detection frequency of the product to be detected comprises the steps of:
recording the back pressure value and the fan running frequency of the sample piece under the specified airflow flow;
acquiring an airflow flow value and a back pressure value of a sample piece after the frequency of the fan is changed to a first frequency;
calculating an airflow flow-backpressure curve functional relation of the sample according to the backpressure value of the sample under the specified airflow flow and the airflow flow value and backpressure value of the sample under the first frequency;
and determining the first frequency as the detection frequency of the product to be detected.
3. The backpressure data detection method of claim 2, wherein the airflow flow-backpressure curve function relationship is as follows:
wherein P represents the back pressure value of the sample piece, Q represents the flow rate of the air flow, and Q0Indicating a specified flow rate of gas, PSample 0Indicating that the flow rate of the sample piece passing through the air flow is Q0Back pressure value of time, QSample 1Representing the actual flow rate of air through the sample after changing the fan frequency to a first frequency f1, PSample 1Indicating that the fan frequency is a first frequency f1 and the airflow rate is QSample 1Sample backpressure value of time.
4. The backpressure data detection method of claim 3, wherein the obtaining of the airflow rate value and the backpressure value of the product to be detected at the detection frequency comprises:
recording the airflow flow value Q of the product to be tested under the detection frequency of the fan frequencyx1And backPressure value Px1。
5. The backpressure data detection method of claim 4, wherein the step of constructing the airflow flow-backpressure curve functional relationship of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected at the detection frequency and the airflow flow-backpressure curve functional relationship of the sample piece comprises the steps of:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequency according to the back pressure value calculation formulax1Back pressure value of (2) P'x1Comprises the following steps:
calculating the airflow flow value Q of the sample piece passing through the product to be detected under the detection frequencyx1Back pressure value of (2) P'x1Back pressure value P of product to be detected under detection frequencyx1The difference between the two is calculated by the following formula:
and calculating an approximate airflow flow and back pressure functional relation of the product to be detected according to the parallel relation:
wherein, PxRepresenting the back pressure value, Q, of the product to be measuredxRepresenting the airflow value of the product to be measured;
and taking the approximate airflow flow and back pressure functional relation of the product to be detected as the airflow flow-back pressure curve functional relation of the product to be detected.
6. The method for detecting back pressure data according to claim 5, wherein the calculating the back pressure value of the product to be detected at a specified airflow rate according to the airflow rate-back pressure curve function relationship of the product to be detected comprises:
wherein, Px0Indicating the passage of the product to be measured through a specified flow rate Q0The back pressure value of time is approximated.
7. A backpressure data detection device, comprising:
the first construction module is used for constructing an airflow flow-backpressure curve functional relation of the sample piece according to a backpressure value of the sample piece under a specified airflow flow, an airflow flow value after the frequency of the fan is changed and the backpressure value, and determining the frequency after the frequency of the fan is changed as the detection frequency of a product to be detected;
the acquisition module is used for acquiring an airflow value and a backpressure value of a product to be detected under a detection frequency;
the second construction module is used for constructing an airflow flow-backpressure curve functional relation of the product to be detected according to the airflow flow value and the backpressure value of the product to be detected under the detection frequency and the airflow flow-backpressure curve functional relation of the sample piece;
and the calculation module is used for calculating the back pressure value of the product to be detected under the specified airflow flow according to the airflow flow-back pressure curve functional relation of the product to be detected.
8. A backpressure data detection system, comprising: the device comprises a detection table, a clamp, a fan, a pipeline, a flowmeter, a pressure sensor, a frequency converter and a control cabinet, wherein the clamp is positioned on the detection table, the clamp is used for fixing a product or a sample to be detected, the fan is connected to the clamp through the pipeline, the flowmeter and the pressure sensor are both arranged on the pipeline, the frequency converter is connected with the fan, the flowmeter, the pressure sensor and the frequency converter are all in communication connection with the control cabinet, and the control cabinet comprises the backpressure data detection device according to claim 7;
the flowmeter is used for detecting the flow rate of the airflow circulating in the pipeline;
the pressure sensor is used for detecting pressure data of the pipeline;
the frequency converter is used for adjusting the frequency of the fan to change the flow;
the fan can convey airflow to a product to be detected or a sample piece fixed on the clamp through the pipeline;
the backpressure data detection device can detect and obtain a backpressure value of a product to be detected fixed on the clamp under a specified airflow flow rate.
9. The backpressure data detection system of claim 8, wherein the control cabinet comprises a PLC controller.
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| CN117268622A (en) * | 2023-11-22 | 2023-12-22 | 江苏润沃达环境科技有限公司 | Back pressure detection device and method for engine tail gas purifier |
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