CN116337176B - Extraction quantity testing method for large water ring pump parallel vacuum system - Google Patents
Extraction quantity testing method for large water ring pump parallel vacuum system Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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Abstract
The invention belongs to the technical field of vacuum system design, and discloses a method for testing the extraction quantity of a large-scale water ring pump parallel vacuum system. The method for testing the parallel air extraction quantity of the large water ring pump comprises the following steps: establishing a topological structure of a large water ring pump parallel vacuum system; establishing an extraction quantity testing system; performing an extraction amount test; and estimating the extraction quantity of the large water ring pump parallel vacuum system. The method for testing the parallel air extraction quantity of the large water ring pump can realize that the small water ring pump is used for replacing the large water ring pump, the small water ring pump is used for evaluating the air extraction quantity of the large water ring pump parallel vacuum system with more large water ring pumps, the reasonable and efficient test flow is used for achieving the purpose of testing, the test efficiency is improved, and the method has a strong popularization value.
Description
Technical Field
The invention belongs to the technical field of vacuum system design, and particularly relates to a method for testing the extraction quantity of a large-scale water ring pump parallel vacuum system.
Background
The water ring pump is a vacuum device which is widely applied in the industrial field, the composition structure and the working principle of the water ring pump determine the change of the water ring pump along with the change of environmental parameters, and the water ring pump belongs to a typical variable extraction amount vacuum device. When a plurality of water ring pumps are connected in parallel to form a vacuum system, the pressure loss of an inlet pipeline and the pressure fluctuation among the pumps can influence the overall pumping capacity of the system, so that the overall pumping capacity of the system is difficult to estimate accurately, and a test is required to be carried out. Therefore, the method for testing the extraction quantity of the water ring pump parallel vacuum system is researched, has important scientific research value for revealing the change rule of the extraction quantity when the water ring pumps are connected in parallel, and has important engineering significance for developing the precise design and precise evaluation of the vacuum system.
For a large-scale water ring pump, a large test site is required for developing the test of the pumping capacity of the parallel system, a high-power motor and a high-power frequency converter are required to be configured, the whole process needs to consume large electric quantity, and the test cost is extremely high. Therefore, developing a parallel test of large water ring pumps faces three technical challenges: firstly, how to use a small water ring pump to replace a large water ring pump to carry out parallel test, thereby reducing equipment investment; secondly, how to use fewer water ring pumps to carry out the test in parallel, and evaluate the pumping capacity of a system with a plurality of water ring pumps in parallel, so as to reduce the requirements of test sites and electricity consumption; and thirdly, how to plan the test flow, so that the test purpose is achieved, the test efficiency is improved, and the period and the labor cost of the whole test are reduced.
Currently, development of an extraction quantity testing method for a large-scale water ring pump parallel vacuum system is needed.
Disclosure of Invention
The invention aims to provide a method for testing the extraction quantity of a large-scale water ring pump parallel vacuum system.
The invention relates to a method for testing the extraction quantity of a large water ring pump parallel vacuum system, which comprises the following steps:
s10, establishing a topological structure of a large water ring pump parallel vacuum system;
s20, establishing an extraction quantity testing system;
s30, performing an extraction amount test;
s40, estimating the extraction quantity of the large water ring pump parallel vacuum system.
Further, the step S10 includes the following:
the method comprises the steps of examining a large-scale water ring pump parallel vacuum system needing to measure the whole extraction quantity of the system, drawing a topological structure, and if the topological structure of the large-scale water ring pump parallel vacuum system is as follows: the air inlet is communicated with the vacuum chamber, the air outlet is communicated with the atmosphere, and the middle is connected in parallelA large water ring pump->
The method comprises the steps of carrying out a first treatment on the surface of the Each large water ring pump is provided with a corresponding valve, step S20 is continued.
Further, the step S20 includes the following:
the method comprises the steps of establishing an extraction quantity testing system, wherein the extraction quantity testing system comprises a path of air inlet main pipeline, a path of test water ring pump I, a path of test water ring pump II, a path of test water ring pump III and a path of air exhaust main pipeline which are sequentially connected; the front end of the air inlet main pipeline is connected with an air inlet, and the middle section of the air inlet main pipeline is provided with an air inlet main pipeline valve and an air inlet main pipeline pressure gauge; the front section of each test water ring pump is a respective air inlet branch, the rear section is a corresponding air outlet branch, and each air inlet branch is provided with a corresponding branch pressure gauge and a corresponding branch valve;
the intake main pipeline valve is used for adjusting the pressure of the intake main pipeline; each branch valve is used for adjusting the pressure of the air inlet main pipeline and each corresponding air inlet branch;
the structure and the technical indexes of the test water ring pump I, the test water ring pump II and the test water ring pump III are the same; each test water ring pump is a small water ring pump which has the same structural style as the large water ring pump and meets the requirement of geometric similarity, and the same structural style refers to indexes including the air suction and exhaust mode, the number and the shape of impeller blades, the distribution plate mode, the number and the type of pump heads are the same.
Further, the step S30 includes the following steps:
s31, carrying out a single pump operation test;
performing a single pump operation test according to GB/T13929-2010 water ring vacuum pump and water ring compressor air quantity measuring method, and performing a single pump operation performance test to obtain extraction quantity performance curves of a test water ring pump I, a test water ring pump II and a test water ring pump III;
s32, carrying out a parallel operation test of two water ring pumps;
synchronously starting a test water ring pump I and a test water ring pump II, running the test water ring pump I and the test water ring pump II in parallel, and adjusting the suction pressure of the air inlet main pipeline to the measuring point pressure by adjusting the air inlet main pipeline valveAfter the water ring pump I to be tested and the water ring pump II to be tested run stably, recording the suction pressure value +.>Testing the suction pressure value of the water ring pump II>；
By testing the pumping capacity performance curve of the water ring pump I, the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump I>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump II, the value of the suction pressure is interpolated>The corresponding pumping quantity of the test water ring pump II>；
By passing throughCalculating the extraction quantity of the air inlet main pipeline>Then pass->Calculating the average pumping quantity of single pump when two test water ring pumps are operated in parallel>；
S33, carrying out three water ring pump parallel operation tests;
continuously starting a test water ring pump III, running the test water ring pump I, the test water ring pump II and the test water ring pump III in parallel, and readjusting the suction pressure of the air inlet main pipeline to the measuring point pressureRecording and testing the suction pressure value of the water ring pump ITesting the suction pressure value of the water ring pump II>Testing the suction pressure value of the water ring pump III>；
By testing the pumping capacity performance curve of the water ring pump I, the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump I>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump II, the value of the suction pressure is interpolated>The corresponding pumping quantity of the test water ring pump II>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump III, the value of the suction pressure is interpolated>The corresponding pumping quantity of the test water ring pump III>；
By passing throughCalculating the extraction quantity of the air inlet main pipeline>Then pass->Calculating single pump average extraction quantity during parallel operation of three test water ring pumps；
S34, calculating the reduction value of the average pumping quantity of the single pump;
by passing throughCalculating the reduction value of the single pump average air extraction quantity during parallel operation of the three test water ring pumps relative to the single pump average air extraction quantity during parallel operation of the two test water ring pumps to obtain the reduction value of the single pump average air extraction quantity。
Further, the step S40 includes the following steps:
by passing throughEstimating the pumping quantity of a large water ring pump parallel vacuum system>；
Wherein the method comprises the steps ofThe number of the large water ring pumps connected in parallel in the large water ring pump parallel vacuum system is +.>。
The difference between the extraction quantity testing system and the large water ring pump parallel vacuum system in the extraction quantity testing method of the large water ring pump parallel vacuum system is mainly expressed in four aspects: the air inlet of the extraction quantity testing system is connected with outdoor atmosphere, and the air inlet of the large water ring pump parallel vacuum system is communicated with the vacuum chamber; secondly, an air inlet main pipeline of the extraction quantity testing system is provided with an air inlet main pipeline pressure gauge, each air inlet branch pipeline is provided with a corresponding branch pressure gauge, and the pressure of the air inlet main pipeline and the air inlet branch pipeline is controlled by adjusting each branch valve, so that the air inlet pressure change of a large-scale water ring pump parallel vacuum system is simulated; thirdly, selecting a small water ring pump which is similar in geometry and has the same structural type with a large water ring pump in a large water ring pump parallel vacuum system by using a test water ring pump I, a test water ring pump II and a test water ring pump III, wherein the same structural type refers to the same indexes including the suction and exhaust mode, the number and the shape of impeller blades, the distribution plate type, the number and the type of pump heads; and fourthly, the number of the water ring pumps to be tested is reasonably selected according to the power supply power of the test site and the size of the site, when the power supply and the site cannot meet the simulation of the number of the water ring pumps of the tested system, the number of the water ring pumps in the test system can be reduced, and at least three water ring pumps to be tested are selected to perform parallel test.
The method for testing the extraction quantity of the large water ring pump parallel vacuum system has the following advantages:
1. the test measurement of the extraction quantity of the large water ring pump parallel vacuum system can be realized;
2. the measurement is carried out by an extraction quantity testing system consisting of small water ring pumps, so that the test site, the electricity consumption and the equipment investment cost required by the measurement of a large water ring pump parallel vacuum system are reduced;
3. the method provides a strong operability test method for measurement and estimation of the large-scale water ring pump parallel vacuum system.
The method for testing the extraction quantity of the large water ring pump parallel vacuum system can replace the large water ring pump by the small water ring pump, evaluate the extraction quantity of the large water ring pump parallel vacuum system with more large water ring pumps by using the quantity of the small water ring pumps, achieve the aim of testing by using a reasonable and efficient test flow, improve the test efficiency and have stronger popularization value.
Drawings
FIG. 1 is a flow chart of a method for testing the pumping capacity of a large water ring pump parallel vacuum system;
FIG. 2 is a topological structure diagram of a large water ring pump parallel vacuum system;
FIG. 3 is a pumping volume test system;
FIG. 4 is a graph comparing a large water ring pump in a large water ring pump parallel vacuum system with a test water ring pump in an extraction test system.
In the figure, 1. An air inlet; 2. an air inlet main pipeline; 3. an intake manifold valve; 4. an intake manifold pressure gauge; 5. an air inlet branch; 6. a branch pressure gauge; 7. a bypass valve; 8. testing a water ring pump I; 9. testing a water ring pump II; 10. testing a water ring pump III; 11. an exhaust branch; 12. an exhaust main pipe; 13. air inlets of large-scale water ring pumps; 14. an exhaust port of the large water ring pump; 15. testing the air inlet of the water ring pump; 16. testing the exhaust port of the water ring pump;
A. a large water ring pump; B. the water ring pump was tested.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
As shown in FIG. 1, the extraction amount testing method of the large water ring pump parallel vacuum system comprises the following steps:
s10, establishing a topological structure of a large water ring pump parallel vacuum system;
s20, establishing an extraction quantity testing system;
s30, performing an extraction amount test;
s40, estimating the extraction quantity of the large water ring pump parallel vacuum system.
Further, the step S10 includes the following:
considering a large-scale water ring pump parallel vacuum system needing to measure the whole extraction quantity of the system, drawing a topological structure shown in figure 2, and if the topological structure of the large-scale water ring pump parallel vacuum system is as follows: the air inlet is communicated with the vacuum chamber, the air outlet is communicated with the atmosphere, and the middle is connected in parallelA, a big water ring pump>The method comprises the steps of carrying out a first treatment on the surface of the Each large water ring pump a is provided with a corresponding valve, step S20 is continued.
Further, the step S20 includes the following:
establishing an extraction quantity testing system shown in fig. 3, wherein the extraction quantity testing system comprises a main air inlet pipeline 2, a test water ring pump I8, a test water ring pump II 9, a test water ring pump III 10 and a main air outlet pipeline 12 which are sequentially connected; the front end of the air inlet main pipeline 2 is connected with an air inlet 1, and the middle section of the air inlet main pipeline 2 is provided with an air inlet main pipeline valve 3 and an air inlet main pipeline pressure gauge 4; the front section of each test water ring pump B is a respective air inlet branch 5, the rear section is a corresponding air outlet branch 11, and each air inlet branch 5 is provided with a corresponding branch pressure gauge 6 and a corresponding branch valve 7;
the intake main pipeline valve 3 is used for adjusting the pressure of the intake main pipeline 2; each branch valve 7 is used for adjusting the pressure of the air inlet main pipeline 2 and each corresponding air inlet branch 5;
as shown in fig. 4, the structures and technical indexes of the test water ring pump i 8, the test water ring pump ii 9 and the test water ring pump iii 10 are the same; each test water ring pump B is a small water ring pump which has the same structural type as the large water ring pump A and meets the requirement of geometric similarity, and the same structural type refers to the same indexes including the air suction and exhaust mode, the number and the shape of impeller blades, the distribution plate type, the number and the type of pump heads. In fig. 4, a large water ring pump a is marked with a large water ring pump air inlet 13 and a large water ring pump air outlet 14, and a test water ring pump B is marked with a test water ring pump air inlet 15 and a test water ring pump air outlet 16.
Further, the step S30 includes the following steps:
s31, carrying out a single pump operation test;
carrying out a single pump operation test according to GB/T13929-2010 water ring vacuum pump and water ring compressor air quantity measuring method, and carrying out a single pump operation performance test to obtain extraction quantity performance curves of a test water ring pump I8, a test water ring pump II 9 and a test water ring pump III 10;
s32, carrying out a parallel operation test of two water ring pumps B;
synchronously starting a test water ring pump I8 and a test water ring pump II 9, running the test water ring pump I8 and the test water ring pump II 9 in parallel, and adjusting the suction pressure of the air inlet main pipeline 2 to the measuring point pressure by adjusting the air inlet main pipeline valve 3After the water ring pump I8 to be tested and the water ring pump II 9 to be tested are stable in operation, recording the suction pressure value of the water ring pump I8 to be tested>Test of suction pressure value of Water Pump II 9 +.>；
By testing the pumping capacity performance curve of the water ring pump I8, the value of the suction pressure is calculated by interpolationThe corresponding test water ring pump I8 is pumping air quantity +.>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump II 9, the value of the suction pressure is calculated by interpolationThe corresponding test water ring pump II 9 is pumping air quantity +.>；
By passing throughCalculating the extraction amount of the air intake main pipeline 2>Then pass->Calculating the single pump average pumping capacity +.>；
S33, carrying out parallel operation tests of three water ring pumps B;
continuously starting the test water ring pump III 10, running the test water ring pump I8, the test water ring pump II 9 and the test water ring pump III 10 in parallel, and readjusting the suction pressure of the air inlet main pipeline 2 to the measuring point pressureThe suction pressure value +.>Test of suction pressure value of Water Pump II 9 +.>Test of suction pressure value of Water Pump III 10 +.>；
By testing the pumping capacity performance curve of the water ring pump I8, the value of the suction pressure is calculated by interpolationThe corresponding test water ring pump I8 is pumping air quantity +.>The method comprises the steps of carrying out a first treatment on the surface of the By passing throughTesting the pumping capacity performance curve of the water ring pump II 9, and calculating the suction pressure value by interpolationThe corresponding test water ring pump II 9 is pumping air quantity +.>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump III 10, the pumping pressure value is interpolated>The corresponding test water ring pump III 10 is pumping air quantity +.>；
By passing throughCalculating the extraction amount of the air intake main pipeline 2>Then pass->Calculating the single pump average extraction quantity when three test water ring pumps B are operated in parallel；
S34, calculating the reduction value of the average pumping quantity of the single pump;
by passing throughCalculating the reduction value of the single pump average air extraction quantity of three test water ring pumps B in parallel operation relative to the single pump average air extraction quantity of two test water ring pumps B in parallel operation to obtain the reduction value of the single pump average air extraction quantity。
Further, the step S40 includes the following steps:
by passing throughEstimating the pumping quantity of a large water ring pump parallel vacuum system>；
The pumping quantity is unified;
wherein the method comprises the steps ofThe number of the large water ring pumps A which are connected in parallel in the large water ring pump parallel vacuum system is +.>。
Example 1:
the parallel vacuum system of the large water ring pump of the embodiment consists of 5 large water ring pumps A which are connected in parallel, wherein N=5, and the vacuum system is formed byEstimating the pumping quantity of a large water ring pump parallel vacuum system>。
Although the embodiments of the present invention have been disclosed above, it is not limited to the use listed in the specification and the embodiments, but it can be fully applied to various fields suitable for the present invention. Additional improvements and modifications will readily occur to those skilled in the art, and the invention is not limited to the specific details and the drawings shown and described herein.
Claims (1)
1. The method for testing the extraction quantity of the large water ring pump parallel vacuum system is characterized by comprising the following steps of:
s10, establishing a topological structure of a large water ring pump parallel vacuum system;
the method comprises the steps of examining a large-scale water ring pump parallel vacuum system needing to measure the whole extraction quantity of the system, drawing a topological structure, and if the topological structure of the large-scale water ring pump parallel vacuum system is as follows: the air inlet is communicated with the vacuum chamber and the air outletThe ports are communicated with the atmosphere, and the middle is connected in parallelA large water ring pump (A), a water pump (B)>The method comprises the steps of carrying out a first treatment on the surface of the Each large water ring pump (A) is provided with a corresponding valve, and the step S20 is continued;
s20, establishing an extraction quantity testing system;
the extraction quantity testing system comprises a path of air inlet main pipeline (2), a path of test water ring pump I (8), a path of test water ring pump II (9), a path of test water ring pump III (10) and a path of air exhaust main pipeline (12) which are sequentially connected; the front end of the air inlet main pipeline (2) is connected with an air inlet (1), and the middle section of the air inlet main pipeline (2) is provided with an air inlet main pipeline valve (3) and an air inlet main pipeline pressure gauge (4); the front section of each test water ring pump (B) is a respective air inlet branch (5), the rear section is a corresponding air outlet branch (11), and each air inlet branch (5) is provided with a corresponding branch pressure gauge (6) and a corresponding branch valve (7);
the air inlet main pipeline valve (3) is used for adjusting the pressure of the air inlet main pipeline (2); each branch valve (7) is used for adjusting the pressure of the air inlet main pipeline (2) and each corresponding air inlet branch (5);
the structures and technical indexes of the test water ring pump I (8), the test water ring pump II (9) and the test water ring pump III (10) are the same; each test water ring pump (B) is a small water ring pump which has the same structural style as the large water ring pump (A) and meets the geometric similarity, and the same structural style refers to indexes including the air suction and exhaust mode, the number and the shape of impeller blades, the distribution plate type, the number and the type of pump heads are the same;
s30, performing an extraction amount test;
s31, carrying out a single pump operation test;
carrying out a single pump operation test according to GB/T13929-2010 water ring vacuum pump and water ring compressor air quantity measuring method, and carrying out a single pump operation performance test to obtain extraction quantity performance curves of a test water ring pump I (8), a test water ring pump II (9) and a test water ring pump III (10);
s32, carrying out parallel operation tests of two water ring pumps (B);
synchronously starting a test water ring pump I (8) and a test water ring pump II (9), running the test water ring pump I (8) and the test water ring pump II (9) in parallel, and adjusting the suction pressure of the air inlet main pipeline (2) to the measuring point pressure by adjusting the air inlet main pipeline valve (3)After the water ring pump I (8) to be tested and the water ring pump II (9) to be tested are stable in operation, recording the suction pressure value of the water ring pump I (8)>Test of suction pressure value of Water Pump II (9)>；
By testing the pumping capacity performance curve of the water ring pump I (8), the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump I (8)>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump II (9), the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump II (9)>；
By passing throughCalculating the extraction quantity of the air inlet main pipeline (2)/>Then pass->Calculating the average pumping capacity of the single pump when the two test water ring pumps (B) are operated in parallel>；
S33, carrying out parallel operation tests of three water ring pumps (B);
continuously starting a test water ring pump III (10), running the test water ring pump I (8), the test water ring pump II (9) and the test water ring pump III (10) in parallel, and readjusting the suction pressure of the air inlet main pipeline (2) to the measuring point pressureThe suction pressure value of the test water ring pump I (8) was recorded +.>Test of suction pressure value of Water Pump II (9)>Test of the suction pressure value of the Water Pump III (10)>；
By testing the pumping capacity performance curve of the water ring pump I (8), the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump I (8)>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump II (9), the value of the suction pressure is calculated by interpolationThe corresponding pumping quantity of the test water ring pump II (9)>The method comprises the steps of carrying out a first treatment on the surface of the By testing the pumping capacity performance curve of the water ring pump III (10), the pumping pressure value is interpolated>The corresponding pumping capacity of the test water ring pump III (10)>；
By passing throughCalculating the pumping quantity of the air inlet main pipeline (2)>Then pass->Calculating the average pumping quantity of a single pump during parallel operation of three test water ring pumps (B)；
S34, calculating the reduction value of the average pumping quantity of the single pump;
by passing throughCalculating the reduction value of the single pump average extraction quantity of three test water ring pumps (B) in parallel operation relative to the single pump average extraction quantity of two test water ring pumps (B) in parallel operation to obtain the reduction value of the single pump average extraction quantity；
S40, estimating the extraction quantity of a large water ring pump parallel vacuum system;
by passing throughEstimating the pumping quantity of a large water ring pump parallel vacuum system>；
Wherein the method comprises the steps ofThe number of the large water ring pumps (A) connected in parallel in the large water ring pump parallel vacuum system is +.>。
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