CN215930979U - Flow detection device - Google Patents
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- CN215930979U CN215930979U CN202121619647.4U CN202121619647U CN215930979U CN 215930979 U CN215930979 U CN 215930979U CN 202121619647 U CN202121619647 U CN 202121619647U CN 215930979 U CN215930979 U CN 215930979U
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Abstract
The present disclosure relates to a flow detection device, the device comprising: the device comprises a processing unit, a pressure detection unit, a temperature detection unit, a connecting pipe and a pressure guiding pipe; wherein, this connecting pipe's one end and emission source intercommunication, this pressure detection unit includes: the pressure probe and the n differential pressure sensors with different measuring ranges are arranged in the connecting pipe, each differential pressure sensor is communicated with the pressure probe through the pressure guiding pipe and is in communication connection with the processing unit, and n is larger than 1. Can carry out the pressure differential through a plurality of pressure differential sensors that possess different ranges and detect, improve the pressure differential detection degree of accuracy, and then improve the degree of accuracy that flow detected.
Description
Technical Field
The present disclosure relates to the field of fluid flow detection, and in particular, to a flow detection device.
Background
Pitot tube, also known as "airspeed tube" or "anemometer," and in english is the Pitot tube. A pitot tube is a tubular device that measures the total and static pressure values of an air stream to determine the velocity of the air stream, known by the invention of h. The pitot tube flowmeter is used for measuring the flow of fluids such as liquid, steam, water, air quantity and the like, and is widely used in the production process of industries such as petrochemical industry, metallurgy, power plants, electric power, light textile and the like. The pitot tube is used for measuring speed and determining flow, a reliable theoretical basis is provided, and the method is convenient and accurate to use and is a classical and wide measuring method.
In the related art, a technique of detecting an absolute pressure value, a total pressure value, a static pressure value, and a temperature value in a pipe and calculating a flow rate of a fluid in the pipe from the total pressure value and the static pressure value is generally called a flow rate detection technique based on the pitot tube principle. The total pressure value is actually the sum of the static pressure value and the dynamic pressure value of the fluid in the pipeline. In the existing flow rate detection technology based on the pitot tube principle, a pressure probe is usually required to be arranged in a pipeline, and the total pressure and the static pressure of fluid are respectively transmitted to a single differential pressure sensor through a pressure guiding pipe, so that the total pressure value and the static pressure value are obtained.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the related art, it is an object of the present disclosure to provide a flow rate detection apparatus and method.
In a first aspect, the present disclosure provides a flow detection device, the device comprising: the device comprises a processing unit, a pressure detection unit, a temperature detection unit, a connecting pipe and a pressure guiding pipe; wherein, one end of the connecting pipe is communicated with a discharge source, and the pressure detecting unit includes: the pressure probe and the n differential pressure sensors with different measuring ranges are arranged in the connecting pipe, each differential pressure sensor is communicated with the pressure probe through the pressure guiding pipe and is in communication connection with the processing unit, and n is larger than 1;
the processing unit is used for fusing the n differential pressure detection values according to the measuring range of each differential pressure sensor and the differential pressure detection value detected by each differential pressure sensor so as to obtain a differential pressure value generated by the fluid discharged by the discharge source flowing through the connecting pipe;
and determining the flow value of the fluid flowing through the connecting pipe according to the absolute pressure value in the connecting pipe, the temperature value in the connecting pipe and the pressure difference value.
Optionally, a static pressure probe and a dynamic pressure probe are arranged in the pressure probe, at least one static pressure leading hole is arranged on the static pressure probe, and a plurality of dynamic pressure leading holes are arranged on the dynamic pressure probe;
the static pressure leading hole is a leading hole facing a target direction, the dynamic pressure leading hole is a leading hole facing the opposite direction of the target direction, and the target direction is the direction of fluid flowing in the connecting pipe.
Optionally, the dynamic pressure leading holes are symmetrically distributed on the dynamic pressure probe with a center line of the connecting pipe as a symmetry axis, and a distance between each point on the center line and a pipe wall of the connecting pipe is equal.
Optionally, the dynamic pressure probe is communicated with the dynamic pressure detection assembly of each differential pressure sensor through the pressure guiding pipe, and the static pressure probe is communicated with the static pressure detection assembly of each differential pressure sensor through the pressure guiding pipe;
the processing unit is used for acquiring a difference value between a total pressure value detected by the dynamic pressure detection assembly and a static pressure value detected by the static pressure detection assembly, and the difference value is used as the pressure difference detection value;
determining a pressure difference candidate value from the n pressure difference detection values, wherein the pressure difference candidate value is within the range of a pressure difference sensor which detects the pressure difference candidate value;
fusing the m differential pressure candidate values to obtain the differential pressure value; wherein m is greater than or equal to 1 and m is less than or equal to n.
Optionally, the processing unit is configured to:
taking the differential pressure candidate value as the differential pressure value in the case where m is equal to 1;
and under the condition that m is larger than 1, acquiring the average value of m differential pressure candidate values as the differential pressure value.
Optionally, the pressure detecting unit further includes: a housing;
the upper plane of each differential pressure sensor is fixed on the upper wall in the shell, and the dynamic pressure detection assembly and the static pressure detection assembly are both arranged at the lower part of the differential pressure sensor.
Optionally, the pressure guiding pipe includes: the static pressure pipe, the dynamic pressure pipe and the pressure connecting pipe are arranged on the base;
the dynamic pressure guide pipe is communicated with the dynamic pressure probe through the pressure guide connecting pipe, and is respectively communicated with the dynamic pressure detection assembly of each differential pressure sensor through the pressure guide connecting pipe;
the static pressure leading pipe is communicated with the static pressure probe through the pressure leading connecting pipe, and is respectively communicated with the static pressure detection assembly of each differential pressure sensor through the pressure leading connecting pipe.
Optionally, both the static pressure leading pipe and the dynamic pressure leading pipe are fixed inside the housing at preset inclined positions and inclined angles;
the inclined position is that the left ends of the static pressure guide pipe and the dynamic pressure guide pipe are lower than the right ends of the static pressure guide pipe and the dynamic pressure guide pipe;
and the left ends of the static pressure leading pipe and the dynamic pressure leading pipe are respectively provided with a water storage bin.
Optionally, the pressure detecting unit further includes: the pressure sensor is communicated with a pressure guiding hole arranged on the connecting pipe through the pressure guiding pipe;
the processing unit is in communication connection with the pressure sensor and is used for acquiring the absolute pressure value detected by the pressure sensor.
Optionally, the temperature detecting unit includes: a plurality of thermometers disposed inside the connecting tube;
and the processing unit is in communication connection with the temperature detection unit and is used for determining a temperature calculated value at the pressure probe in the connecting pipe as the temperature value according to the temperature detection value detected by each thermometer and the distance between each thermometer and the pressure probe.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the device that this disclosed embodiment provided includes: the device comprises a processing unit, a pressure detection unit, a temperature detection unit, a connecting pipe and a pressure guiding pipe; the connection pipe is communicated with a discharge source, and the pressure detection unit includes: the pressure probe and a plurality of differential pressure sensors with different ranges are arranged in the connecting pipe, and each differential pressure sensor is communicated with the pressure probe through the pressure guiding pipe; the processing unit is used for fusing a plurality of differential pressure detection values according to the measuring range of each differential pressure sensor and the differential pressure detection value detected by each differential pressure sensor so as to obtain the differential pressure value generated by the fluid flowing through the connecting pipe, and further determining the flow value of the fluid flowing through the connecting pipe according to the differential pressure detection values. Can carry out the pressure differential through a plurality of pressure differential sensors that possess different ranges and detect, improve the pressure differential detection degree of accuracy, and then improve the degree of accuracy that flow detected.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram illustrating the construction of a flow sensing device according to an exemplary embodiment;
FIG. 2 is a schematic structural diagram of another flow sensing device according to FIG. 1;
FIG. 3 is a schematic cross-sectional view of a connecting tube according to FIG. 2;
FIG. 4 is a schematic structural diagram of a pressure detecting unit according to FIG. 2;
FIG. 5 is a flow chart illustrating a method of traffic detection in accordance with an exemplary embodiment;
fig. 6 is a flow chart of another flow sensing method according to fig. 5.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the existing flow detection technology based on the pitot tube principle, a single differential pressure sensor is usually adopted to collect the total pressure value and the static pressure value. However, the ranges of different differential pressure sensors are fixed, and when the flow rate of the fluid to be measured changes in a large range, the total pressure value or the static pressure value corresponding to the actual flow rate of the fluid exceeds the range of the differential pressure sensor, which further causes errors in the detected total pressure value and static pressure value, and reduces the accuracy of flow rate detection. In the conventional flow rate detection technology based on the pitot tube principle, the total pressure of the fluid is usually collected by a plurality of dynamic pressure holes provided in a pressure probe, but the distribution positions of the dynamic pressure holes on the pressure probe are usually randomly distributed, and the randomly distributed dynamic pressure holes do not consider the characteristics of the fluid flowing in the pipeline, which affects the accuracy of the collected total pressure of the fluid and reduces the accuracy of flow rate detection.
To this end, the present disclosure provides a flow rate detection device, which specifically includes:
fig. 1 is a schematic structural diagram illustrating a flow rate detection device according to an exemplary embodiment, and as shown in fig. 1, the device 100 includes: a processing unit 110, a pressure detecting unit 120, a temperature detecting unit 130, a connecting pipe 140, a pressure guiding pipe 150 and a signal line 160; wherein one end of the connection pipe 140 (the right end of the connection pipe 140 is taken as an example in fig. 1) is communicated with the discharge source 200, and the pressure detecting unit 120 includes: the pressure probe 121, n differential pressure sensors 122 and 123 having different ranges are provided in the connection pipe 140, where n is greater than 1.
Illustratively, each of the differential pressure sensors 122 is in communication with the pressure probe 121 through the pressure guiding tube 150, and each of the differential pressure sensors 122 is in communication with the processing unit 110 through a signal line 160, and the pressure sensor 123 is in communication with a pressure guiding hole 141 provided on the connecting tube 140 through the pressure guiding tube 150.
For example, the discharge source 200 may be a device that discharges a fluid, which may be water or gas. In the embodiment of the present disclosure, the flow rate detection device 100 will be described by taking the emission source 200 as a vehicle exhaust pipe and taking the fluid as vehicle exhaust as an example. In fig. 1, the right end of the connection pipe 140 is connected to the discharge source 200, the vehicle exhaust discharged from the discharge source 200 flows into the connection pipe 140 from right to left, impacts the pressure probe 121, and forms total pressure on the right side of the pressure probe 121 (the total pressure is the sum of dynamic pressure generated by kinetic energy of fluid impact and static pressure of the connection pipe 140), and the left side of the pressure probe 121 is not impacted by fluid due to the obstruction of the pressure probe 121 itself, and forms static pressure. The pressure probe 121 collects the total pressure on the right side and the static pressure on the left side, and guides the total pressure and the static pressure to 4 differential pressure sensors 122 with different ranges through the pressure guiding pipe 150, so that each differential pressure sensor 122 generates a differential pressure detection value. The connection pipe 140 is further provided with a pressure guide hole 141, and the pressure sensor 123 is directly connected to the pressure guide hole 141 through a pressure guide pipe 150 to detect an absolute pressure value in the connection pipe 140. The temperature detecting unit 130 is disposed inside the connecting pipe 140 and is used for detecting a temperature value inside the connecting pipe 140. The processing unit 110 is communicatively connected to the pressure sensor 123, the differential pressure sensor 122 and the temperature detecting unit 130 through a signal line 160 or a wireless connection, respectively, to obtain data detected by the pressure sensor 123, the differential pressure sensor 122 and the temperature detecting unit 130. Note that signal lines between the processing unit 110 and the temperature monitoring unit 130 are not shown in fig. 1.
For example, the ranges of the n differential pressure sensors 122 are preferably not identical and there is an overlap between the ranges of two adjacent differential pressure sensors 122. Taking the example where the pressure monitoring unit 140 includes 4 differential pressure sensors A, B, C and D, the measurement range can be: the range of the differential pressure sensor a is 3 to 80 (Pa); the range of the differential pressure sensor B is 50 to 250 (Pa); the range of the differential pressure sensor C is 160 to 1600 (Pa); the range of the differential pressure sensor D is 500 to 6890 (Pa).
Illustratively, the processing unit 110 is configured to fuse n pressure difference detection values according to the measurement range of each of the pressure difference sensors 122 and the pressure difference detection value detected by each of the pressure difference sensors 122 to obtain a pressure difference value generated by the fluid discharged from the discharge source 200 flowing through the connection pipe 140; the flow rate of the fluid flowing through the connection pipe 140 is determined according to the absolute pressure value in the connection pipe 140, the temperature value in the connection pipe 140, and the pressure difference value.
For example, the pressure difference detection value is a difference between the pressure value of the total pressure (or total pressure value) and the pressure value of the static pressure (or static pressure value). In the detection process, each differential pressure sensor 122 can acquire the total pressure value and the static pressure value, and further generate the differential pressure detection value. After the processing unit 110 obtains n differential pressure detection values detected by the n differential pressure sensors 122, the n differential pressure detection values may be first screened according to the differential pressure detection values and the ranges of the differential pressure sensors 122 corresponding to the differential pressure detection values, and then the remaining differential pressure detection values after screening are fused to finally obtain a differential pressure value. After determining the pressure difference value, the absolute pressure value and the temperature value, the flow rate value of the fluid flowing through the connection pipe 140 may be determined through a preset flow rate formula.
For example, the flow equation may be expressed as the following equation (1):
wherein m is the flow value (or called mass flow) and the unit is kg/h,
in advance according to the detection environment and the detection objectThe flow correction factor is set, A is the sectional area of the connection pipe 140 and has a unit of
P is the absolute pressure value, expressed in Pa, M is the relative molecular mass of the fluid (i.e., vehicle exhaust) in the connecting tube 140, expressed in g/mol, and R is a predetermined gas constant, expressed in
The temperature values, stated above, are in units of K,
the above-mentioned differential pressure values are expressed in Pa. The absolute pressure value P, the temperature value T, and the differential pressure value are substituted into the formula (1), and the flow rate value of the fluid flowing through the connection pipe 140 can be calculated.
In summary, the technical scheme provided by the embodiment of the present disclosure can perform differential pressure detection through a plurality of differential pressure sensors having different ranges, and fuse a plurality of differential pressure detection values, thereby avoiding the situation that the differential pressure generated by the fluid exceeds the range of the sensors, improving the accuracy of differential pressure detection, and further improving the accuracy of flow detection.
Fig. 2 is a schematic structural diagram of another flow rate detecting device shown in fig. 1, and as shown in fig. 2, the pressure probe includes a static pressure probe 1211 and a dynamic pressure probe 1212, the static pressure probe 1211 is provided with at least one static pressure guiding hole 124, and the dynamic pressure probe 1212 is provided with a plurality of dynamic pressure guiding holes 125. Fig. 2 shows a static pressure probe 1211 provided with one static pressure pilot hole 124 and a dynamic pressure probe 1212 provided with two dynamic pressure pilot holes 125. The static pressure pilot hole 124 is a pilot hole facing a target direction, and the two dynamic pressure pilot holes 125 are pilot holes facing opposite directions of the target direction. The target direction, as indicated by the arrow inside the connection pipe 140 in fig. 2, is a direction in which the fluid flows in the connection pipe 140. In addition, the temperature detection unit includes: a plurality of thermometers disposed inside the connection pipe 140.
In fig. 2, the temperature detection unit is illustrated by way of example as including two thermometers 131 and 132. Specifically, in order to theoretically secure the accuracy of the calculated flow rate value, the temperature value and the differential pressure value used in the above formula (1) should be the temperature value and the differential pressure value at the same position in the connection pipe 140. It is noted that the differential pressure value is the differential pressure value at the positions of the static pressure probe 1211 and the dynamic pressure probe 1212, and thus, the temperature value should also be the temperature value at the positions of the static pressure probe 1211 and the dynamic pressure probe 1212. However, if the thermometer is provided at the pressure probe (including the static pressure probe 1211 and the dynamic pressure probe 1212), the thermometer is affected by the pressure probe and turbulence generated by the fluid flowing through the pressure probe, and accuracy is degraded. Therefore, a plurality of thermometers may be disposed in the connection pipe 140 at a predetermined distance from the pressure probe, and the temperature detection values detected by the thermometers may be fused according to the distance from the pressure probe to each thermometer, so as to obtain a temperature value to be finally used for calculating the flow rate value. Based on this, the processing unit 110, which is connected to the temperature detecting unit in a communication manner, is used for determining the temperature calculation value at the pressure probe in the connecting pipe 140 as the temperature value according to the temperature detection value detected by each of the thermometers 131, 132 and the distance between each of the thermometers 131, 132 and the pressure probe. Specifically, the distance between each of the thermometers 131, 132 and the pressure probe determines the weight of weighted average calculation of the temperature detection values, and the closer the thermometer is, the more the weight of the detection data thereof is. For example, if the distance between the thermometer 131 and the pressure probe is 3cm and the distance between the thermometer 132 and the pressure probe is 9cm, it can be determined that the weight for fusing the two temperature detection values is 0.75 for the thermometer 131 and 0.25 for the thermometer 132, respectively. In practice, to simplify the calculation, the two thermometers 131, 132 may be arranged at equal distances from the pressure probe without affecting the layout of the other elements. In this way, the average value of the temperature detection values detected by the two thermometers 131 and 132 can be directly obtained as the temperature value.
Illustratively, each of the differential pressure sensors 122 includes: dynamic pressure detection subassembly and static pressure detection subassembly. The processing unit 110 is configured to obtain a difference between a total pressure value detected by the dynamic pressure detecting assembly and a static pressure value detected by the static pressure detecting assembly, as the pressure difference detection value; determining a pressure difference candidate value from the n pressure difference detection values, wherein the pressure difference candidate value is within the range of a pressure difference sensor which detects the pressure difference candidate value; fusing the m pressure difference candidate values to obtain the pressure difference value; wherein m is greater than or equal to 1 and m is less than or equal to n. Specifically, each differential pressure sensor 122 detects a differential pressure before and after the pressure probe at the same time, and generates a differential pressure detection value. If a detected pressure difference detection value of a certain pressure difference sensor, for example, a pressure production sensor A, falls within the range of the pressure difference sensor A, the pressure difference detection value is considered to be valid, and the pressure difference detection value is reserved; otherwise, the pressure difference detection value is considered invalid, and the pressure difference detection value is deleted, and finally m pressure difference candidate values are obtained.
Illustratively, the processing unit 110 is configured to: taking the pressure difference candidate value as the pressure difference value under the condition that m is equal to 1; and under the condition that m is larger than 1, acquiring an average value or an average value of m differential pressure candidate values as the differential pressure value. It can be understood that if only one candidate value of the differential pressure (m is equal to 1) is left after screening, the candidate value of the differential pressure can be directly used as a final differential pressure value; if a plurality of pressure difference candidate values (m is greater than 1) are obtained through screening, an arithmetic mean value of the plurality of pressure difference candidate values can be calculated to be used as a final pressure difference value. Alternatively, it is preferable that different weights be set for the differential pressure sensors 122 having different ranges according to the detection environment and the detection target before the flow rate detection is started, and when the final differential pressure value is determined from the differential pressure candidate values, an average value of the plurality of differential pressure candidate values is calculated as the final differential pressure value according to the weights corresponding to the different differential pressure sensors 122.
Specifically, the 4 differential pressure sensors A, B, C and D described above are still taken as an example, wherein the range of differential pressure sensor a is 3 to 80 (Pa); the range of the differential pressure sensor B is 50 to 250 (Pa); the range of the differential pressure sensor C is 160 to 1600 (Pa); differential pressure sensor D ranges from 500 to 6890 (Pa). The method comprises the following steps that 4 differential pressure sensors simultaneously detect four groups of data corresponding to the same moment, the four groups of data are fused together, and specifically, if the detected value is a differential pressure sensor A: 34 (Pa), differential pressure sensor B: 31.2 (Pa), differential pressure sensor C: 20 (Pa), differential pressure sensor D: 15 (Pa), since the detected value of the differential pressure sensor a falls within the range of the differential pressure sensor a, and the detected values of the other sensors do not fall within the respective corresponding sensors, only the detected value of the differential pressure sensor a is assumed here: 34 (Pa). If the detected value is a differential pressure sensor A: 73 (Pa), differential pressure sensor B: 71 (Pa), differential pressure sensor C: 80 (Pa), differential pressure sensor D: 67 (Pa), since the detected values of the differential pressure sensors a and B each fall within the range of the respective corresponding differential pressure sensors a and B, and the detected values of the differential pressure sensors C and D do not fall within the respective corresponding differential pressure sensors, the average of the detected values of the differential pressure sensors a and B is calculated here: 72 (Pa).
Therefore, according to the technical scheme shown in fig. 2 provided by the embodiment of the present disclosure, in addition to performing differential pressure detection by using a plurality of differential pressure sensors with different ranges, and screening and fusing a plurality of differential pressure detection values, so as to improve the accuracy of differential pressure detection, temperature detection by using a plurality of thermometers disposed at different positions can be performed, and a plurality of temperature detection values can be fused, so as to improve the accuracy of temperature detection, and further improve the accuracy of flow detection.
Illustratively, fig. 3 is a schematic structural diagram illustrating a cross-section of a connecting pipe according to an exemplary embodiment, and as shown in fig. 3, a plurality of dynamic pressure inducing holes 125A, 125B, 125C, 125A, 125B, 125C are formed in the dynamic pressure probe 1212. The dynamic pressure guiding holes 125A, 125B, 125C, 125A, 125B, 125C are symmetrically distributed on the dynamic pressure probe 1212 using the center line of the connecting tube 140 as the symmetry axis, and each point on the center line has the same distance from the tube wall of the connecting tube 140. In fig. 3, the outermost circle is used to represent the cross section of the connection pipe 140, and the center of the circle is located at the center line penetrating through the connection pipe 140. Based on the theory of fluid mechanics, the flow rate of the fluid flowing through the connecting tube 140 can be described as decreasing closer to the wall of the connecting tube 140 and increasing closer to the centerline. Each point on the circular dotted line inside the circle is equidistant from the pipe wall of the connection pipe 140, and the flow rate of the fluid at each point on the circular dotted line can be considered to be equal, and therefore, the circular dotted lines are hereinafter referred to as constant velocity lines, and the circle formed by each constant velocity line has the same center as the circle formed by the pipe wall of the connection pipe 140. In the embodiment of the present disclosure, the flow value calculated by the above formula (1) is an average flow value of the fluid in the connecting tube 140, and therefore, the dynamic pressure pilot holes 125A, 125B, 125C may be provided at the intersection of each isovelocity line and the dynamic pressure probe 1212, so as to transmit different total pressures collected by the dynamic pressure pilot holes 125A, 125B, 125C to the differential pressure sensor, thereby achieving a complete representation of the flow velocity of the fluid in each isovelocity line in the connecting tube 140. As shown in the drawing, there are two intersections between each isovelocity line and the dynamic pressure probe 1212, and three dynamic pressure pilot holes 125A, 125B, and 125C corresponding to the dynamic pressure pilot holes 125A, 125B, and 125C may be provided. Wherein the dynamic pressure leading hole 125A corresponds to the dynamic pressure leading hole 125A; the dynamic pressure leading hole 125B corresponds to the dynamic pressure leading hole 125B; the dynamic pressure leading holes 125C correspond to the dynamic pressure leading holes 125C. So, there are two total pressure collection points on every isokinetic line, avoid single collection point to appear the problem that the error influences the accuracy of total pressure transmission.
Fig. 4 is a schematic structural diagram illustrating a pressure detection unit according to an exemplary embodiment, and as shown in fig. 4, the pressure detection unit 120 further includes: a housing 126. The upper plane of each of the differential pressure sensors 122 is fixed to the upper wall of the interior of the housing 126, the dynamic pressure probe communicates with the dynamic pressure detecting unit 1221 of each of the differential pressure sensors 122 through a pressure guiding pipe, and the static pressure probe communicates with the static pressure detecting unit 1222 of each of the differential pressure sensors 122 through a pressure guiding pipe. Both the dynamic pressure detecting unit 1221 and the static pressure detecting unit 1222 are disposed at the lower portion of the differential pressure sensor 122. Further, the pressure guiding pipe comprises: a static pressure leading pipe 151, a dynamic pressure leading pipe 152 and a pressure leading connecting pipe 153; the dynamic pressure leading pipe 151 is communicated with the dynamic pressure probe through the pressure leading connection pipe 153, and the dynamic pressure leading pipe 151 is respectively communicated with the dynamic pressure detecting assembly 1221 of each of the differential pressure sensors 122 through the pressure leading connection pipe 153; the static pressure leading pipe 152 communicates with the static pressure probe through the pressure leading connection pipe 153, and the static pressure leading pipe 152 communicates with the static pressure detecting assembly 1222 of each differential pressure sensor 122 through the pressure leading connection pipe 153, respectively. The static pressure leading pipe 151 and the dynamic pressure leading pipe 152 are provided with valves 128a, 128b, and 128 c.
For example, when the pressure detecting unit 120 is in an operating state, the valve 128c is disconnected, and the valves 128a and 128b are communicated, so as to introduce the total pressure and the static pressure. When the pressure detecting unit 120 is not in an operating state, the valve 128c may be opened, and the valves 128a and 128b may be closed, so that the zero calibration and calibration operations of the respective differential pressure sensors 122 may be performed by an air pump communicating with the static pressure pilot tube 151 or the dynamic pressure pilot tube 152.
Illustratively, both the static pressure suction pipe 151 and the dynamic pressure suction pipe 152 are fixed inside the housing 126 at a preset inclined position and an inclined angle. As shown in fig. 4, the inclined position is such that the left ends of the static pressure leading pipe 151 and the dynamic pressure leading pipe 152 are lower than the right ends of the static pressure leading pipe 151 and the dynamic pressure leading pipe 152; the inclination angle may be set to be between 5 and 30 degrees, and the left ends of the static pressure suction pipe 151 and the dynamic pressure suction pipe 152 are provided with the water storage tanks 127a and 127b, respectively. It is understood that "left end" and "right end" are used herein to characterize opposite ends of the same lead tube, and that the "left end" and "right end" may be interchanged when viewing the pressure monitoring unit 120 in different directions.
For example, when the pressure detecting unit 120 is in an operating state, the exhaust gas of the vehicle may flow through the static pressure pipe 151, the dynamic pressure pipe 152, and the pressure connecting pipe 153. Because of the temperature change, condensed water may be generated in the vehicle exhaust, and in order to prevent the condensed water from entering each differential pressure sensor 122, each differential pressure sensor may be disposed on the upper wall inside the housing 126, and the flow direction of the condensed water is limited by gravity, so as to avoid the condition that the condensed water enters the differential pressure sensor 122 to affect the accuracy of differential pressure detection, and even cause sensor damage. Taking the static pressure leading pipe 151 as an example, the condensed water gradually flows down into the static pressure leading pipe 151 based on the position of each differential pressure sensor 122. Since the static pressure leading pipe 151 is disposed at the inclined position, the condensed water in the static pressure leading pipe 151 gradually flows to the water storage bin 127a to be stored. Preferably, the water storage bins 127a and 127b are detachable water storage bins, and the pressure detecting unit 120 outputs a warning message to warn a worker to drain water or replace the water storage bins 127a and 127b when the amount of water in the water storage bins 127a and 127b exceeds a preset amount.
In summary, the technical solution provided by the embodiments of the present disclosure can perform differential pressure detection through a plurality of differential pressure sensors with different ranges, and fuse a plurality of differential pressure detection values, thereby avoiding a situation that a differential pressure generated by a fluid exceeds the range of the sensors, improving the accuracy of differential pressure detection, and improving the effectiveness of pressure transmission and the accuracy of flow detection through a specific setting position of a dynamic pressure guiding hole. In addition, this flow detection device that openly provides avoids the condensate that generates in the pressure pipe to get into the sensor through the pressure pipe that inclines to set up and the water storage storehouse on the pressure pipe, improves the security of device.
Fig. 5 is a flowchart illustrating a flow rate detection method according to an exemplary embodiment, and as shown in fig. 5, the method is applied to a processing unit provided in the flow rate detection apparatus 100, and the method includes:
The discharge source is communicated with the flow detection device through the connecting pipe, the n differential pressure sensors have different measuring ranges, and n is larger than 1.
Fig. 6 is a flowchart of another flow rate detection method shown in fig. 5, which is applied to the processing unit provided in the flow rate detection apparatus 100 shown in fig. 6, and before the step 202, the method includes:
And step 204, determining a temperature calculation value at the pressure probe in the connecting pipe as the temperature value according to the temperature detection value detected by each thermometer arranged on the connecting pipe and the distance between the thermometer and the pressure probe arranged in the connecting pipe.
Optionally, the step 201 may include: acquiring a difference value between a total pressure value detected by a dynamic pressure detection assembly of the differential pressure sensor and a static pressure value detected by a static pressure detection assembly of the differential pressure sensor, and taking the difference value as a differential pressure detection value; determining a pressure difference candidate value from the n pressure difference detection values, wherein the pressure difference candidate value is within the range of a pressure difference sensor which detects the pressure difference candidate value; fusing the m pressure difference candidate values to obtain the pressure difference value; wherein m is greater than or equal to 1 and m is less than or equal to n.
Optionally, the step of "fusing m candidate values of the pressure difference to obtain the pressure difference value" may include:
taking the pressure difference candidate value as the pressure difference value under the condition that m is equal to 1; alternatively, the first and second electrodes may be,
and acquiring the average value of m pressure difference candidate values as the pressure difference value under the condition that m is larger than 1.
In summary, the flow rate detection method provided by the embodiments of the present disclosure can perform differential pressure detection by using a plurality of differential pressure sensors with different ranges, and fuse a plurality of differential pressure detection values, thereby avoiding a situation that a differential pressure generated by a fluid exceeds the range of the sensors, improving the accuracy of differential pressure detection, and improving the effectiveness of pressure collection in a connection pipe and the accuracy of flow rate detection by using specific setting positions and numbers of dynamic pressure leading holes. In addition, this flow detection device that openly provides is through the draw pressure pipe and the water storage storehouse on the draw pressure pipe that the slope set up, avoids the condensate that generates in the draw pressure pipe to get into the sensor, avoids the sensor trouble that liquid causes, improves the security of device.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
Claims (10)
1. A flow sensing device, the device comprising: the device comprises a processing unit, a pressure detection unit, a temperature detection unit, a connecting pipe and a pressure guiding pipe; wherein, one end of the connecting pipe is communicated with a discharge source, and the pressure detecting unit includes: the pressure probe and the n differential pressure sensors with different measuring ranges are arranged in the connecting pipe, each differential pressure sensor is communicated with the pressure probe through the pressure guiding pipe and is in communication connection with the processing unit, and n is larger than 1.
2. The device as claimed in claim 1, wherein a static pressure probe and a dynamic pressure probe are arranged in the pressure probe, at least one static pressure leading hole is arranged on the static pressure probe, and a plurality of dynamic pressure leading holes are arranged on the dynamic pressure probe;
the static pressure leading hole is a leading hole facing a target direction, the dynamic pressure leading hole is a leading hole facing the opposite direction of the target direction, and the target direction is the direction of fluid flowing in the connecting pipe.
3. The device of claim 2, wherein the plurality of dynamic pressure inducing holes are symmetrically distributed on the dynamic pressure probe with a center line of the connecting pipe as a symmetry axis, and each point on the center line is equidistant from a pipe wall of the connecting pipe.
4. An apparatus according to claim 3, wherein said dynamic pressure probe communicates with a dynamic pressure detecting assembly of each of said differential pressure sensors through said pressure introduction pipe, and said static pressure probe communicates with a static pressure detecting assembly of each of said differential pressure sensors through said pressure introduction pipe.
5. The apparatus of claim 4, wherein the pressure detection unit further comprises: a housing;
the upper plane of each differential pressure sensor is fixed on the upper wall in the shell, and the dynamic pressure detection assembly and the static pressure detection assembly are both arranged at the lower part of the differential pressure sensor.
6. The apparatus of claim 5, wherein the pressure introduction tube comprises: the static pressure pipe, the dynamic pressure pipe and the pressure connecting pipe are arranged on the base;
the dynamic pressure guide pipe is communicated with the dynamic pressure probe through the pressure guide connecting pipe, and is respectively communicated with the dynamic pressure detection assembly of each differential pressure sensor through the pressure guide connecting pipe;
the static pressure leading pipe is communicated with the static pressure probe through the pressure leading connecting pipe, and is respectively communicated with the static pressure detection assembly of each differential pressure sensor through the pressure leading connecting pipe.
7. The apparatus according to claim 6, wherein both the static pressure suction pipe and the dynamic pressure suction pipe are fixed inside the housing at a preset inclined position and an inclined angle;
the inclined position is that the left ends of the static pressure guide pipe and the dynamic pressure guide pipe are lower than the right ends of the static pressure guide pipe and the dynamic pressure guide pipe;
and the left ends of the static pressure leading pipe and the dynamic pressure leading pipe are respectively provided with a water storage bin.
8. The apparatus according to any one of claims 1-7, wherein the pressure detection unit further comprises: the pressure sensor is communicated with a pressure guiding hole arranged on the connecting pipe through the pressure guiding pipe;
and the processing unit is in communication connection with the pressure sensor and is used for acquiring the absolute pressure value detected by the pressure sensor.
9. The apparatus according to any one of claims 1 to 7, wherein the temperature detection unit comprises: a plurality of thermometers disposed inside the connecting tube, each thermometer communicatively coupled with the processing unit.
10. The apparatus of claim 9, wherein the distance between each thermometer and the pressure probe is a predetermined distance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121619647.4U CN215930979U (en) | 2021-07-16 | 2021-07-16 | Flow detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121619647.4U CN215930979U (en) | 2021-07-16 | 2021-07-16 | Flow detection device |
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| CN215930979U true CN215930979U (en) | 2022-03-01 |
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| CN202121619647.4U Active CN215930979U (en) | 2021-07-16 | 2021-07-16 | Flow detection device |
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