CN114674525A - Pipeline flow characteristic verification device and verification method thereof - Google Patents
Pipeline flow characteristic verification device and verification method thereof Download PDFInfo
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Abstract
The invention discloses a pipeline flow characteristic verification device and a verification method thereof, wherein the device comprises an inlet pressure gauge and a connecting assembly, the inlet pressure gauge is respectively arranged at the inlet end of a pipeline to be detected and is used for detecting the inlet pressure value of the pipeline to be detected, the connecting assembly is connected with the outlet end of the pipeline to be detected and comprises a connecting pipe connected with the outlet end of the pipeline to be detected, an outlet pressure gauge is arranged on the connecting pipe and is used for detecting the outlet pressure value of the pipeline to be detected, an adjusting valve is arranged on the connecting pipe and is used for adjusting the flow of the pipeline to be detected, and a flowmeter is used for detecting the flow of the pipeline to be detected; the pipeline flow characteristic verification method comprises the steps of detecting and drawing a flow-pressure loss characteristic curve of a pipeline to be detected by using the device; detecting the pressure loss condition of the pipeline to be detected under a certain flow rate, comparing the pressure loss condition with the characteristic curve of the original pipeline on the water supply system, and further judging whether the pipeline to be detected meets the requirements of the water supply system; the invention can accurately calculate whether the pipeline to be measured meets the requirement of the water supply system, and the device and the method are simple and easy to operate.
Description
Technical Field
The invention relates to the technical field of pipeline flow, in particular to a pipeline flow characteristic verification device and a verification method thereof.
Background
Generally, a pipe used for long-distance water delivery is a hard pipe with a metal type, or a hose made of the most extensive coilable high polymer material such as rubber, and the like, and under the condition of determining parameters of a water pump, an engineer usually adopts an estimation mode to consider whether the length of the used pipe can meet the requirements of a water supply system, but the actual length of the required pipe cannot be quantized by the estimation mode, and the estimation result is greatly different from the actual length due to the influence of multiple factors such as the roughness of the inner wall of the pipe, and the used pipe cannot meet the requirements of the water supply system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pipeline flow characteristic verification device and a verification method thereof, which can accurately calculate whether a pipeline to be detected meets the requirement of a water supply system, and have simple structure and easy operation.
The technical scheme adopted by the invention for solving the technical problem is as follows: the utility model provides a pipeline flow characteristic verification device for whether the pipeline that verifies await measuring accords with water supply system flow requirement, including set up the entry manometer that is used for detecting the pipeline entry pressure value that awaits measuring at the pipeline entry end that awaits measuring respectively, the coupling assembling of being connected with the pipeline exit end that awaits measuring, coupling assembling include the connecting pipe of being connected with the pipeline exit end that awaits measuring, set up the export manometer that is used for detecting the pipeline exit pressure value that awaits measuring on the connecting pipe, set up the governing valve that is used for adjusting the pipeline flow that awaits measuring on the connecting pipe and be used for detecting the flowmeter of the pipeline flow that awaits measuring.
Further, preferably, the outlet pressure gauge is arranged close to an outlet end of a connecting pipe, and the outlet end of the connecting pipe is connected with the regulating valve.
Preferably, the inlet end of the connecting pipe is connected with the outlet end of the pipeline to be measured through a flange, and the outlet end of the connecting pipe is connected with the regulating valve through a flange.
Preferably, the outlet pressure gauge, the regulating valve and the connecting pipe are of split structures and detachably connected, or the outlet pressure gauge, the regulating valve and the connecting pipe are of an integrated structure.
Preferably, the outlet pressure gauge is at least 0.5-grade precision pressure gauge, and a buffer elbow is connected between the pressure gauge and the connecting pipe.
Further, preferably, the flowmeter is an ultrasonic flowmeter, and the ultrasonic flowmeter is bound on the outer wall of the connecting pipe, wherein the upstream length of the ultrasonic flowmeter is 10 times of the diameter of the connecting pipe, and the downstream length of the ultrasonic flowmeter is 5 times of the diameter of the connecting pipe.
Further, preferably, the flowmeter is a common flowmeter except for an ultrasonic flowmeter, and the flowmeter is installed between the pipe to be measured and the connecting pipe.
A pipeline flow characteristic verification method is used for verifying whether a pipeline to be tested meets the requirement of the flow of a water supply system, and comprises the following steps:
S1, measuring the sectional area of the pipeline to be measured and the length of the pipeline to be measured;
s2, adjusting the regulating valve to adjust the flow of the pipeline to be tested by using the pipeline flow characteristic verification device, recording the inlet pressure value and the outlet pressure value of the pipeline to be tested under the flow after the flow is stable each time, and calculating the pressure loss value of the pipeline to be tested under the flow according to the inlet pressure value and the outlet pressure value;
s3, substituting the sectional area of the pipeline, the length of the pipeline to be detected and the pressure loss value into a formula
Thereby drawing a flow-pressure loss characteristic curve of the pipeline to be measured;
wherein, Δ P is the pressure loss of the pipeline to be measured, ξ is the resistance coefficient of the pipeline to be measured, L is the pipeline length of the pipeline to be measured, a is the pipeline sectional area of the pipeline to be measured, and Q is the flow rate of the pipeline to be measured;
s4, quantitatively obtaining the pressure loss value of the pipeline to be tested at a certain flow rate according to the flow-pressure loss characteristic curve, and further judging whether the pipeline to be tested meets the flow rate requirement of a water supply system;
and S5, if the flow characteristics are met, the flow characteristics are applicable to the water supply system, if the flow characteristics are not met, the material of the pipeline to be tested is selected again, and the steps S1-S4 are repeated again for the new pipeline to be tested until the pipeline meeting the flow characteristics of the water supply system is found.
Further, it is preferable that the step S2 includes:
installing an inlet pressure gauge between the inlet end of the pipeline to be tested and the outlet end of the experimental water supply system, and connecting a connecting pipe assembly to the outlet end of the pipeline to be tested;
opening coupling assembling's governing valve, starting experiment water supply system, treating that governing valve outlet flow is stable, reduce governing valve aperture gradually, take notes flow, the pipeline entry pressure value that awaits measuring, the export pressure value under the different apertures to calculate the loss of pressure value.
Further, in the step S2, preferably, the regulating valve is adjusted at least 3 times to adjust the flow rate of the pipe to be measured, after the flow rate is stabilized each time, the inlet pressure value and the outlet pressure value of the pipe to be measured at the flow rate are recorded, and the pressure loss value of the pipe to be measured at the flow rate is calculated according to the inlet pressure value and the outlet pressure value.
The invention has the beneficial effects that: the invention provides a pipeline flow characteristic verification device and a verification method thereof, the pipeline flow characteristic verification device can control the pointer reading of an outlet pressure gauge by adjusting different opening degrees of an adjusting valve, record the value of an inlet pressure gauge of a pipeline to be tested at the moment and the measurement data of a flow meter, can calculate the resistance coefficient xi of the pipeline to be tested, can further draw a flow-pressure loss characteristic curve of the pipeline section to be tested, can quantitatively obtain the pressure loss condition of the pipeline to be tested under a certain flow through the flow-pressure loss characteristic curve, and can further judge whether the pipeline to be tested meets a certain flow requirement of a water supply system; can accurately calculate whether the pipeline to be measured meets the requirement of a water supply system, and has simple structure and easy operation.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a schematic structural diagram of a connection component in a pipe flow characteristic verification apparatus in embodiment 1 of the present invention;
FIG. 2 is a graph showing a flow rate-pressure loss characteristic of example 2-1 of the present invention;
FIG. 3 is a characteristic curve of an RTP pipe in example 2-1 of the present invention;
FIG. 4 is a graph showing a comparison between the flow rate-pressure loss characteristic curve of example 2-1 of the present invention and the characteristic curve of a medium RTP channel.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
An element is said to be "secured to" or "disposed on" another element, either directly or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
The terms "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to an orientation or position based on the orientation or position shown in the drawings.
The terms "axial" and "radial" refer to the length of the entire device or component as being "axial" and the direction perpendicular to the axial direction as being "radial".
The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless explicitly defined otherwise.
The above terms are for convenience of description only and should not be construed as limiting the present technical solution.
Embodiment 1, as shown in fig. 1, a device for verifying a flow characteristic of a pipeline, which is used to verify whether a pipeline to be tested meets a flow requirement of a water supply system, includes an inlet pressure gauge (not shown) respectively arranged at an inlet end of the pipeline to be tested and used to detect an inlet pressure value of the pipeline to be tested, and a connecting assembly 2 connected to an outlet end of the pipeline to be tested, where the connecting assembly 2 includes a connecting pipe 21 connected to the outlet end of the pipeline to be tested, an outlet pressure gauge 22 arranged on the connecting pipe 21 and used to detect an outlet pressure value of the pipeline to be tested, a regulating valve 23 arranged on the connecting pipe 21 and used to regulate a flow of the pipeline to be tested, and a flow meter 23 used to detect a flow of the pipeline to be tested, where the connecting pipe 21 is a straight pipe; by adjusting different opening degrees of the regulating valve 23, pointer reading of the outlet pressure gauge 22 can be controlled, the value of the inlet pressure gauge of the pipeline to be measured at the moment and the value measured by the flowmeter 23 are recorded, the resistance coefficient of the pipeline to be measured can be calculated, a flow-pressure loss characteristic curve of the pipeline section to be measured can be drawn, the pressure loss condition of the pipeline to be measured at a certain flow can be obtained quantitatively through the flow-pressure loss characteristic curve, and whether the pipeline to be measured meets the requirement of a water supply system at a certain flow can be judged; the device can accurately calculate whether the pipeline to be measured meets the requirement of a water supply system, and has a simple structure and easy operation.
The outlet pressure gauge 22 is arranged close to the outlet end of the connecting pipe 21, and the outlet end of the connecting pipe 21 is connected with the regulating valve 23; the inlet end of the connecting pipe 21 is connected with the outlet end of the pipeline to be measured through a flange, the outlet end of the connecting pipe 21 is connected with the regulating valve 23 through a flange, and the regulating valve 23 is used for regulating different opening degrees to regulate the flow of the pipeline to be measured; the outlet pressure gauge 22, the regulating valve 23 and the connecting pipe 21 have various embodiments, the outlet pressure gauge 22, the regulating valve 23 and the connecting pipe 21 can be of split structures and are detachably connected, and the regulating valve 23 can select the regulating valve 23 with a proper specification according to actual conditions; or the outlet pressure gauge 22, the regulating valve 23 and the connecting pipe 21 are of an integral structure and are integrally molded during production, so that the assembly steps are reduced.
The flow meter 23 also has various embodiments, the flow meter 23 may be an ultrasonic flow meter, the ultrasonic flow meter is bound on the outer wall of the connecting pipe 21, wherein the upstream length of the ultrasonic flow meter is 10 times the diameter of the pipe of the connecting pipe 21, the downstream length of the ultrasonic flow meter is 5 times the diameter of the pipe of the connecting pipe 21, the connecting pipe 21 is a straight pipe, the ultrasonic flow meter detects the flow of the connecting pipe 21, which means that the detected flow of the pipe to be detected is also the flow of the pipe to be detected, because the ultrasonic flow meter is affected by different water velocity distributions, it is required that the upstream and the downstream of the ultrasonic flow meter should have lengths of 10D (D is the diameter of the pipe of the connecting pipe 21, the same below) and 5D straight pipes, and the arrangement is so as to make the ultrasonic flow meter 23 detect the flow of the pipe to be detected more accurately and reduce detection errors; of course, the flow meter 23 may be a general flow meter other than the ultrasonic flow meter, and the general flow meter 23 is installed between the pipe to be measured and the connection pipe 21 to detect the flow rate of the pipe to be measured.
s1, measuring the sectional area of the pipeline to be measured and the length of the pipeline to be measured;
s2, using the pipeline flow characteristic verification apparatus of embodiment 1, adjusting the regulating valve 23 multiple times to adjust the flow of the pipeline to be tested, recording an inlet pressure value and an outlet pressure value of the pipeline to be tested at the flow after the flow is stabilized each time, and calculating a pressure loss value of the pipeline to be tested at the flow according to the inlet pressure value and the outlet pressure value;
s3, substituting the sectional area of the pipeline, the length of the pipeline to be tested and the pressure loss value into a formula
Thereby drawing a flow-pressure loss characteristic curve of the pipeline to be tested;
wherein, Δ P is the pressure loss of the pipeline to be measured, ξ is the resistance coefficient of the pipeline to be measured, L is the pipeline length of the pipeline to be measured, A is the pipeline sectional area of the pipeline to be measured, and Q is the flow of the pipeline to be measured;
s4, quantitatively obtaining a pressure loss value of the pipeline to be tested at a certain flow rate according to the flow rate-pressure loss characteristic curve, and further judging whether the pipeline to be tested meets the flow rate requirement of a water supply system; the pressure loss condition of the pipeline to be detected under a certain flow (a water supply system) can be obtained quantitatively through the flow-pressure loss characteristic curve, and compared with the original characteristic curve of the pipeline on the water supply system, so that whether the pipeline to be detected meets the requirement of the certain flow can be judged, namely, under the same pressure loss condition, if the flow of the hose to be detected is higher than or equal to the flow of the original pipeline, the flow of the hose to be detected is consistent, and if the flow of the hose to be detected is lower than the flow of the original pipeline, the flow of the hose to be detected is not consistent;
And S5, if the flow characteristics are consistent, the flow characteristics can be applied to the water supply system, if the flow characteristics are not consistent, the material selection of the pipeline to be tested is carried out again, and the steps S1-S4 need to be repeated again for the new pipeline to be tested until the pipeline which is consistent with the flow characteristics of the water supply system is found.
Wherein, the step of S2 includes:
installing an inlet pressure gauge between the inlet end of the pipeline to be tested and the outlet end of the experimental water supply system, and connecting the connecting pipe 21 assembly to the outlet end of the pipeline to be tested;
opening coupling assembling 2's governing valve 23, starting experiment water supply system, treating 23 export flow stabilities of governing valve, the 23 valve aperture of gradual reduction governing valve takes notes flow, the pipeline entry pressure value that awaits measuring, the export pressure value under the different apertures to calculate the loss of pressure value.
The step S2 needs to be performed many times, the adjusting valve 23 is adjusted at least 3 times to adjust the flow rate of the pipe to be tested, after the flow rate is stable at each time, the inlet pressure value and the outlet pressure value of the pipe to be tested at the flow rate are recorded, the pressure loss value of the pipe to be tested at the flow rate is calculated according to the inlet pressure value and the outlet pressure value, and the data of the flow rate-pressure loss characteristic curve which is seriously deviated are rejected, so that a relatively precise and smooth characteristic curve is obtained, and the data accuracy of verifying the flow rate characteristic of the pipe to be tested is ensured.
Example 2-1, a pipe to be tested with a length of 50m and a nominal diameter DN100 (pipe outer diameter 108mm) is taken, one end of the pipe to be tested is connected to the output end of the hand-lift mobile pump for experiment, the inlet pressure gauge in the verification device in example 1 is connected between the mobile pump and the pipe section to be tested, the straight pipe-shaped connecting pipe 21 is connected to the outlet end of the pipe to be tested, the length of the connecting pipe 21 is 1.5m, the outlet pressure gauge 22 and the adjusting valve 23 are installed on the connecting pipe 21, the ultrasonic flowmeter 24 is installed on the connecting pipe 21 (5D after the first 10D is met), the hand-lift mobile pump is started, the adjusting valve 23 is adjusted, reading is carried out after the reading of the flowmeter 24 is stabilized, the inlet pressure gauge and the outlet pressure gauge 22 on the connecting pipe at the moment are recorded, 3 sets of relation data of pressure loss and flow rate are obtained by adjusting the adjusting valve 23 for many times, so as to obtain a relatively precise and smooth characteristic curve, the data are shown in the following table;
TABLE 1 data of pressure loss of pipeline to be measured
| Inlet pressure value | Outlet pressure value | Loss of pressure | Flow rate |
| 4.2bar | 4.1bar | 0.1bar | 27m3/h |
| 5.0bar | 4.5bar | 0.5bar | 60m3/h |
| 5.6bar | 4.8bar | 0.8bar | 76m3/h |
Substituting the above data into formula
Drawing a pressure and flow characteristic curve of the pipeline to be measured, wherein a curve chart is shown in figure 2; wherein, Δ P is the pressure loss of the pipeline to be measured, ξ is the resistance coefficient of the pipeline to be measured, L is the pipeline length of the pipeline to be measured, A is the pipeline sectional area of the pipeline to be measured, and Q is the flow of the pipeline to be measured;
And comparing the flow rate of the pipeline with the original RTP (reinforced thermoplastic material) pipeline of the water supply system under the same working condition, and judging whether the pipeline to be detected meets the substitution requirement of the water supply system.
The relevant parameters of the RTP pipeline when the normal process system (water supply system) is operated are shown in table 2, and a characteristic curve of the RTP pipeline is drawn according to the data, as shown in fig. 3;
TABLE 2 RTP pipe operating parameters
Comparing the characteristic curve of the pipeline to be tested flow rate-pressure loss of fig. 2 with the characteristic curve of the RTP pipeline of fig. 3, and comparing the characteristic curves with fig. 4, it can be known from the graph that the characteristic curve of the pipeline to be tested flow rate-pressure loss is slower than the characteristic curve of the RTP pipeline under the same pressure loss condition, that is, the flow rate of the hose to be tested is higher under the same pressure loss condition; by comparing the characteristic curve of the flow rate-pressure loss of the pipeline to be tested with the characteristic curve of the original RTP pipeline, the performance of the hose to be tested meets the requirements of the pipeline (RTP pipeline) of the original process (water supply) system, and the hose to be tested can be applied to the original functional position.
Claims (10)
1. The utility model provides a pipeline flow characteristic verification device for whether the pipeline that verifies await measuring accords with the water supply system flow requirement, its characterized in that, including set up respectively at the pipeline entry end that awaits measuring and be used for detecting the entry manometer of the pipeline entry pressure value that awaits measuring, coupling assembling (2) of being connected with the pipeline exit end that awaits measuring, coupling assembling (2) include with the connecting pipe (21) that the pipeline exit end that awaits measuring is connected, set up export manometer (22) that are used for detecting the pipeline exit pressure value that awaits measuring on connecting pipe (21), set up on connecting pipe (21) and be used for adjusting governing valve (23) of the pipeline flow that awaits measuring and be used for detecting flowmeter (24) of the pipeline flow that awaits measuring.
2. The device for verifying the flow characteristics of a pipeline according to claim 1, characterized in that the outlet pressure gauge (22) is arranged close to the outlet end of the connecting pipe (21), and the outlet end of the connecting pipe (21) is connected with the regulating valve (23).
3. The pipeline flow characteristic verification device according to claim 1, wherein the inlet end of the connecting pipe (21) is connected with the outlet end of the pipeline to be tested through a flange, and the outlet end of the connecting pipe (21) is connected with the regulating valve (23) through a flange.
4. The device for verifying the flow characteristics of the pipelines according to claim 1, wherein the outlet pressure gauge (22), the regulating valve (23) and the connecting pipe (21) are of a split structure and are detachably connected, or the outlet pressure gauge (22), the regulating valve (23) and the connecting pipe (21) are of an integrated structure.
5. The device for verifying the flow characteristic of the pipeline according to claim 1, wherein the outlet pressure gauge (22) is a precision pressure gauge with at least 0.5 grade, and a buffer elbow is connected between the outlet pressure gauge (22) and the connecting pipe (21).
6. The pipe flow characterizer according to claim 1 wherein the flow meter (24) is an ultrasonic flow meter that is bonded to the outside wall of the connecting pipe (21), wherein the ultrasonic flow meter has an upstream length that is 10 times the pipe diameter of the connecting pipe (21) and a downstream length that is 5 times the pipe diameter of the connecting pipe (21).
7. The pipe flow characteristic verification device according to claim 1, wherein the flow meter (24) is a general flow meter other than an ultrasonic flow meter, and the flow meter (24) is installed between the pipe to be measured and the connection pipe (21).
8. A pipeline flow characteristic verification method is used for verifying whether a pipeline to be tested meets the requirement of the flow characteristic of a water supply system, and is characterized by comprising the following steps:
s1, measuring the sectional area of the pipeline to be measured and the length of the pipeline to be measured;
s2, using the pipeline flow characteristic verification device according to any one of claims 1 to 7, adjusting the regulating valve (23) for multiple times to adjust the flow of the pipeline to be tested, recording the inlet pressure value and the outlet pressure value of the pipeline to be tested under the flow after the flow is stabilized each time, and calculating the pressure loss value of the pipeline to be tested under the flow according to the inlet pressure value and the outlet pressure value;
s3, substituting the sectional area of the pipeline, the length of the pipeline to be measured and the pressure loss value into a formula
Thereby drawing a flow-pressure loss characteristic curve of the pipeline to be measured;
wherein, Δ P is the pressure loss of the pipeline to be measured, ξ is the resistance coefficient of the pipeline to be measured, L is the pipeline length of the pipeline to be measured, a is the pipeline sectional area of the pipeline to be measured, and Q is the flow rate of the pipeline to be measured;
S4, quantitatively obtaining the pressure loss value of the pipeline to be tested at a certain flow rate according to the flow-pressure loss characteristic curve, and further judging whether the pipeline to be tested meets the flow rate requirement of a water supply system;
and S5, if the flow characteristics are consistent, the flow characteristics can be applied to the water supply system, if the flow characteristics are not consistent, the material selection of the pipeline to be tested is carried out again, and the steps S1-S4 need to be repeated again for the new pipeline to be tested until the pipeline which is consistent with the flow characteristics of the water supply system is found.
9. The method for verifying the flow characteristics of the pipeline according to claim 8, wherein the step S2 includes:
an inlet pressure gauge is arranged between the inlet end of the pipeline to be tested and the outlet end of the experimental water supply system, and a connecting pipe (21) assembly is connected to the outlet end of the pipeline to be tested;
open governing valve (23) of coupling assembling (2), start experiment water supply system, treat that governing valve (23) export flow is stable, reduce governing valve (23) valve aperture gradually, record flow, the pipeline entry pressure value that awaits measuring, the export pressure value under the different apertures to calculate the loss of pressure value.
10. The method for verifying the flow characteristics of the pipeline according to claim 9, wherein in the step S2, the regulating valve (23) is adjusted at least 3 times to adjust the flow of the pipeline to be tested, after the flow is stabilized each time, an inlet pressure value and an outlet pressure value of the pipeline to be tested at the flow are recorded, and the pressure loss value of the pipeline to be tested at the flow is calculated according to the inlet pressure value and the outlet pressure value.
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