CN115371892A - System and method for testing back pressure valve - Google Patents
System and method for testing back pressure valve Download PDFInfo
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- CN115371892A CN115371892A CN202211009979.XA CN202211009979A CN115371892A CN 115371892 A CN115371892 A CN 115371892A CN 202211009979 A CN202211009979 A CN 202211009979A CN 115371892 A CN115371892 A CN 115371892A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/025—Details with respect to the testing of engines or engine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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Abstract
The application provides a test system and a test method of a backpressure valve, wherein the test system comprises a test unit (6) for testing a first backpressure valve (64); the gas supply unit (1) supplies gas to the test unit (6), and an outlet of the gas supply unit (1) is communicated with an inlet of the test unit (6); the data acquisition and monitoring unit (10) is used for monitoring and controlling the test unit (6) and the gas supply unit (1) and acquiring data; the test method adopts the test system. The test system and the test method provided by the application can simulate the actual working condition of the back pressure valve, so that the performance data of the back pressure valve under the actual working condition can be obtained.
Description
Technical Field
The application relates to the technical field related to valve testing, in particular to a testing system and a testing method of a back pressure valve.
Background
The back pressure valve in the exhaust system of the special diesel engine test bed has important significance for simulating the potential working environment of the diesel engine, is a key component in the special diesel engine test system, frequently and quickly acts, and has very high requirements on the precision, the sealing property and the reliability of the valve.
In the prior art, the performance of the valve can be verified whether the valve meets the requirements or not through testing. However, most of the existing valve testing systems are liquid in medium, single in function, fixed in equipment, manual in testing process, low in testing efficiency, accuracy and precision, and difficult to completely meet the actual working condition of the use of the back pressure valve, and cannot be flexibly changed according to testing requirements. The back pressure valve manufacturers in China generally adopt liquid media to carry out simple tests, and judge whether the performance is qualified or not in combination with human, the accuracy of the tested experimental result is poor, and the efficiency of the test work is not high.
Therefore, it is necessary to develop a back pressure valve testing system for verifying the valve performance, so as to provide a basis for early-stage model selection and practical use.
Disclosure of Invention
The application aims to provide a test system and a test method of a back pressure valve, and the test system and the test method simulate the actual working condition of the back pressure valve to obtain performance data of the back pressure valve under the actual working condition.
To achieve the above object, the present application provides a technical solution:
a test system for a backpressure valve, the test system comprising:
the testing unit is used for testing the first backpressure valve;
the gas supply unit supplies gas to the test unit, and an outlet of the gas supply unit is communicated with an inlet of the test unit;
and the data acquisition and monitoring unit is used for monitoring and controlling the test unit and the gas supply unit and acquiring data.
In some embodiments of the present application, the test unit comprises a first temperature sensor, a first pressure sensor, a second pressure sensor, and a second temperature sensor;
the inlet of the test unit, the inlet of the first temperature sensor, the inlet of the first pressure sensor and the inlet of the first backpressure valve are sequentially connected in series, and the outlets of the first backpressure valve, the second pressure sensor, the second temperature sensor and the test unit are sequentially connected in series;
the first temperature sensor monitors the air inlet temperature of the first backpressure valve, the first pressure sensor monitors the air inlet pressure of the first backpressure valve, the second pressure sensor monitors the air outlet pressure of the first backpressure valve, and the second pressure sensor monitors the air outlet temperature of the first backpressure valve.
In some embodiments of the present application, the test unit further comprises a first reducer and a second reducer;
the first reducing pipe is connected in series between the inlet of the test unit and the first temperature sensor, and the second reducing pipe is connected in series between the outlet of the test unit and the second temperature sensor.
In some embodiments of the present application, the test unit further comprises a displacement sensor;
the displacement sensor is connected with the first backpressure valve in series and monitors the response time of the first backpressure valve.
In some embodiments of the present application, the air supply unit includes an air inlet, a filter, and a blower connected in series in sequence;
the air inlet is communicated with the outside of the test system, and the air blower pumps air into the test unit from the air inlet.
In some embodiments of the present application, the test system further comprises a heating unit;
the heating unit is connected between the outlet of the gas supply unit and the inlet of the testing unit in series, heats the gas supplied by the gas supply unit, and the heated gas enters the testing unit;
the heating unit includes a heater that heats the gas supplied by the gas supply unit.
In some embodiments of the present application, the heating unit further comprises a surge tank;
the pressure stabilizing tank is connected with an outlet of the heater in series, and the pressure of the gas obtained after the gas is heated by the heater is stabilized by the pressure stabilizing tank.
In some embodiments of the present application, the test system further comprises a cooling unit;
the inlet of the cooling unit is connected with the outlet of the testing unit in series, and the outlet of the cooling unit is communicated with the outside of the testing system;
the cooling unit cools the gas leaving the test unit and then discharges the cooled gas to the outside of the test system;
the cooling unit comprises a cooler, a first stop valve and a second stop valve;
one end of the first stop valve and one end of the second stop valve are respectively connected with the cooler in series, the other end of the first stop valve is communicated with a cooling water inlet, and the other end of the second stop valve is communicated with a cooling water outlet.
In some embodiments of the present application, the test system further comprises a flow regulation unit;
the flow regulating unit is connected in series between the outlet of the heating unit and the inlet of the testing unit and regulates the flow of the gas before entering the testing unit.
In some embodiments of the present application, the flow regulating unit comprises a plurality of pipes arranged in parallel;
the inlet of each pipeline is communicated with the outlet of the heating unit, an electric valve is arranged on each pipeline, and each electric valve is controlled by the data acquisition and monitoring unit to be opened and closed to switch each pipeline.
In some embodiments of the present application, the test system further comprises a bypass branch and a bypass valve;
the inlet of the bypass valve is connected in series between the outlet of the flow regulating unit and the inlet of the testing unit, and the outlet of the bypass valve is communicated with the bypass branch.
In some embodiments of the present application, a first flow meter is connected in series between the outlet of the flow regulating unit and the inlet of the testing unit, and the first flow meter is located between the inlet of the bypass valve and the inlet of the testing unit;
and a second flowmeter is connected in series between the outlet of the testing unit and the inlet of the cooling unit.
In some embodiments of the present application, the test system further comprises a second backpressure valve connected in series between the second flow meter and the inlet of the cooling unit.
In order to achieve the purpose, the application also provides the following technical scheme:
a method of testing a backpressure valve, using a test system comprising:
the testing unit is used for testing the first backpressure valve;
the gas supply unit supplies gas to the test unit, and an outlet of the gas supply unit is communicated with an inlet of the test unit;
the data acquisition and monitoring unit is used for monitoring and controlling the test unit and the gas supply unit and acquiring data;
the test method comprises the following steps:
step one, starting the gas supply unit to supply gas to the test unit and the first backpressure valve;
and step two, controlling the data acquisition and monitoring unit so as to monitor and control the gas supply unit and the test unit.
In some embodiments of the present application, in the test system, the test unit includes a first temperature sensor, a first pressure sensor, a second pressure sensor, and a second temperature sensor; the inlet of the test unit, the inlet of the first temperature sensor, the inlet of the first pressure sensor and the inlet of the first backpressure valve are sequentially connected in series, and the outlets of the first backpressure valve, the second pressure sensor, the second temperature sensor and the test unit are sequentially connected in series; the first temperature sensor monitors the inlet air temperature of the first backpressure valve, the first pressure sensor monitors the inlet air pressure of the first backpressure valve, the second pressure sensor monitors the outlet air pressure of the first backpressure valve, and the second pressure sensor monitors the outlet air temperature of the first backpressure valve;
in the testing method, the second step further includes collecting the inlet temperature, the inlet pressure, the outlet temperature and the outlet pressure of the first backpressure valve through the data acquisition and monitoring unit.
In some embodiments of the present application, in the test system, the test unit further includes a displacement sensor; the displacement sensor is connected with the first backpressure valve in series, and the response time of the first backpressure valve is monitored;
in the test method, the first step further comprises the step of adjusting the opening degree of the first backpressure valve every other first opening degree interval within the range of the first opening degree of the first backpressure valve;
and the second step further comprises that the data acquisition and monitoring unit collects the data of the displacement sensor under different opening degrees.
In some embodiments of the present application, in the testing system, the air supply unit includes an air inlet, a filter, and a blower connected in series in sequence; the air inlet is communicated with the outside of the test system, and the air blower pumps air into the test unit from the air inlet;
in the testing method, the first step further comprises activating the blower to pump gas from the gas inlet into the testing unit.
In some embodiments of the present application, the test system further comprises a heating unit; the heating unit is connected between the outlet of the gas supply unit and the inlet of the testing unit in series, heats the gas supplied by the gas supply unit, and the heated gas enters the testing unit; the heating unit comprises a heater and a pressure stabilizing tank, the heater heats the gas supplied by the gas supply unit, the pressure stabilizing tank is connected with an outlet of the heater in series, and the pressure of the gas obtained after the gas is heated by the heater is stabilized by the pressure stabilizing tank;
in the test method, in the first step, before starting the blower, the method further includes starting the heater and preheating, and the gas enters the surge tank after being heated and then leaves the heating unit.
In some embodiments of the present application, the test system further comprises a cooling unit; the inlet of the cooling unit is connected with the outlet of the testing unit in series, and the outlet of the cooling unit is communicated with the outside of the testing system; the cooling unit cools the gas leaving the testing unit and then discharges the cooled gas to the outside of the testing system; the cooling unit comprises a cooler, a first stop valve and a second stop valve; one end of the first stop valve and one end of the second stop valve are respectively connected with the cooler in series, the other end of the first stop valve is communicated with a cooling water inlet, and the other end of the second stop valve is communicated with a cooling water outlet;
in the testing method, the first step further includes opening the first and second shutoff valves, and activating the cooler to cool the gas leaving the first backpressure valve to be discharged to the outside of the testing system.
In some embodiments of the present application, the test system further comprises a flow regulation unit; the flow regulating unit is connected between the outlet of the heating unit and the inlet of the testing unit in series and regulates the flow of the gas before the gas enters the testing unit; the flow regulating unit comprises a plurality of pipelines which are arranged in parallel; the inlet of each pipeline is communicated with the outlet of the heating unit, an electric valve is arranged on each pipeline, and each electric valve is controlled by the data acquisition and monitoring unit to be opened and closed to switch each pipeline;
in the testing method, the second step further includes that the data acquisition and monitoring unit controls the opening and closing of each pipeline in the flow regulating unit so as to switch each pipeline.
In some embodiments of the present application, the test system further comprises a bypass branch and a bypass valve; the inlet of the bypass valve is connected between the outlet of the flow regulating unit and the inlet of the testing unit in series, and the outlet of the bypass valve is communicated with the bypass branch;
the testing method further comprises the first step of controlling the bypass valve to be opened by the data acquisition and monitoring unit to discharge the gas from the bypass branch out of the testing system when the first backpressure valve fails or the pressure between the flow regulating unit and the first backpressure valve is too high.
In some embodiments of the present application, a first flow meter is connected in series between an outlet of the flow regulating unit and an inlet of the testing unit, and the first flow meter is located between an inlet of the bypass valve and an inlet of the testing unit; a second flowmeter is connected in series between the outlet of the test unit and the inlet of the cooling unit;
in the test method, the first step further comprises adjusting the heater to make the temperature of the gas reach a target value, and collecting data of each instrument for multiple times within collection time;
the first step also comprises the steps of adjusting the opening degree of the first back pressure valve once every other second opening degree interval within the second opening degree range of the first back pressure valve and collecting data of each instrument;
the second step further comprises that the data acquisition and monitoring unit collects the data of the first flowmeter and the second flowmeter and draws a valve flow characteristic curve.
In some embodiments of the present application, the test system further comprises a second backpressure valve connected in series between the second flowmeter and the inlet of the cooling unit;
the first step further comprises adjusting the second backpressure valve to adjust the back pressure of the first backpressure valve after the valve.
In some embodiments of the present application, the testing method further includes an external sealing detection of the valve opening state: closing the second backpressure valve, opening the first backpressure valve, starting the air blower to pump the gas into the test system, closing the heating unit and the cooling unit, and opening the electric valve on the corresponding pipeline in the flow regulating unit;
when the data of the first pressure sensor is stabilized at a first set value, the data are maintained for a first set time, and then the data of the first pressure sensor and the data of the second pressure sensor are collected and compared.
In some embodiments of the present application, the testing method further includes, in a valve closed state, detecting internal and external sealability: opening the second backpressure valve, opening the first backpressure valve, starting the air blower to pump the gas into the test system, closing the heating unit and the cooling unit, and opening the electric valve on the corresponding pipeline in the flow regulating unit;
and when the data of the first pressure sensor is stabilized at a second set value, closing an electric valve on the corresponding pipeline in the flow regulating unit, closing the first backpressure valve, keeping the first set time, collecting the data of the first pressure sensor and comparing the data with the second set value.
The beneficial effect of this application is:
1. the application provides a test system and a test method of back pressure valve, test method has adopted test system, test system designs to back pressure valve capability test, the back pressure valve is including the backpressure governing valve that is used for special diesel engine exhaust system, test system can simulate the operating mode environment of back pressure valve is surveyed back pressure valve's performance data provides reliable experimental data reference for follow-up relevant optimal design.
2. According to the test system and the test method, the actual working condition of the backpressure valve is simulated by additionally arranging the heating unit when high-temperature gas is used as a working medium, so that the performance data of the backpressure valve is obtained, and a designer of the backpressure valve can improve and optimize the structure and the performance of the backpressure valve according to the experimental data; moreover, the device also has the advantages of small error and high precision when high-temperature gas is used as a test medium.
3. The test system and the test method have wide universality, are suitable for simulation tests of back pressure valves with different specifications, different sizes and different flow rates, can simulate actual working conditions under more various and complex conditions, and can provide fully detailed experimental data support for the optimization design of designers.
4. The application provides among the test system because of having flow control unit and pipeline thereof, accessible data monitoring and monitoring unit come control switch each the break-make of pipeline to satisfy the test demand of the valve under test of different specifications, also can satisfy the test demand of same valve under test when facing different flow, have better general use when having efficient work efficiency.
5. The test system provided by the application is simple and reliable in structure, the provided test method is simple, convenient and quick, and the obtained data is good in accuracy and representativeness.
6. The testing system and the testing method provided by the application do not need manual operation, the accuracy of the testing result and the efficiency of testing work are improved, and the automatic testing of the valve flow characteristic, the valve response time and the valve sealing performance can be realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a piping diagram of a test system according to an embodiment of the present application.
The main reference numbers in the drawings accompanying the present specification are as follows:
1-an air supply unit; 11-an air inlet; 12-a filter; 13-a blower;
2-a heating unit; 21-a heater; 22-a surge tank;
3-a flow regulating unit; 31-an electrically operated valve;
4-a bypass valve;
5-a first flow meter;
6-a test unit; 60-a first reducing pipe; 61-a second reducing pipe; 62-a first temperature sensor; 63-a first pressure sensor; 64-a first back pressure valve; 65-a displacement sensor; 66-a second pressure sensor; 67-a second temperature sensor;
7-a second flow meter;
8-a second back pressure valve;
9-a cooling unit; 91-a first stop valve; 92-a cooler; 93-a second stop valve;
10-a data acquisition and monitoring unit.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The present application provides a system and a method for testing a back pressure valve, which will be described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
Example 1
In some embodiments of the present application, as shown in figure 1, a test system for a backpressure valve, the test system comprising: a test unit 6 for testing the first backpressure valve 64; the gas supply unit 1 is used for supplying gas to the test unit 6, and an outlet of the gas supply unit 1 is communicated with an inlet of the test unit 6; and the data acquisition and monitoring unit 10 is used for monitoring and controlling the test unit 6 and the gas supply unit 1 and acquiring data. The test system may simulate the actual conditions of the first backpressure valve 64 to obtain performance data of the first backpressure valve 64 under the actual conditions.
As shown in fig. 1, in some embodiments of the present application, the test unit 6 includes a first temperature sensor 62, a first pressure sensor 63, a second pressure sensor 66, and a second temperature sensor 67; the inlet of the test unit 6, the inlet of the first temperature sensor 62, the inlet of the first pressure sensor 63 and the inlet of the first backpressure valve 64 are sequentially connected in series, and the outlet of the first backpressure valve 64, the outlet of the second pressure sensor 66, the outlet of the second temperature sensor 67 and the outlet of the test unit 6 are sequentially connected in series; the first temperature sensor 62 monitors the inlet air temperature of the first backpressure valve 64, the first pressure sensor 63 monitors the inlet air pressure of the first backpressure valve 64, the second pressure sensor 66 monitors the outlet air pressure of the first backpressure valve 64, and the second pressure sensor 66 monitors the outlet air temperature of the first backpressure valve 64. The above data may provide a well-documented experimental data reference for optimizing and improving the structural design of the first back pressure valve 64.
As shown in fig. 1, in some embodiments of the present application, the test unit 6 further comprises a first reducer 60 and a second reducer 61; the first reducing pipe 60 is connected in series between an inlet of the test unit 6 and the first temperature sensor 62, and the second reducing pipe 61 is connected in series between an outlet of the test unit 6 and the second temperature sensor 67. It is understood that the specific adopted size and specification of the first and second reducing pipes 60 and 61 are selected and adjusted according to the specification of the first backpressure valve 64 or experimental requirements.
As shown in fig. 1, in some embodiments of the present application, the test unit 6 further comprises a displacement sensor 65; the displacement sensor 65 is connected in series with the first backpressure valve 64 and monitors the response time of the first backpressure valve 64. It is understood that the displacement sensor 65 has a signal when the valve stem in the first back pressure valve 64 is operated; when the valve stem is stationary, the displacement sensor 65 has no signal; the present application monitors the movement of the valve stem in the first back pressure valve 64 via the displacement sensor 65 to record the length of time each actuation of the first back pressure valve 64 takes.
In some embodiments of the present application, the air supply unit 1 includes an air inlet 11, a filter 12, and a blower 13 connected in series; the gas inlet 11 communicates with the outside of the test system, and the blower 13 pumps gas from the gas inlet 11 into the test unit 6. The filter 12 may filter and purify the gas sucked from the outside of the test system, and may also block foreign materials from entering the blower 13 and causing damage to the blower 13. It is understood that the size of the aperture of the air inlet 11, the size and material of the filter 12, and the size of the blower 13 can be selected and adjusted according to actual requirements.
As shown in fig. 1, in some embodiments of the present application, the test system further comprises a heating unit 2; the heating unit 2 is connected in series between the outlet of the gas supply unit 1 and the inlet of the test unit 6, heats the gas supplied by the gas supply unit 1, and the heated gas enters the test unit 6; the heating unit 2 includes a heater 21, and the heater 21 heats the gas supplied from the gas supply unit 1. The back pressure valve in the exhaust system of the special diesel engine test bed has important significance for simulating the potential working environment of the diesel engine and is a key component in the special diesel engine test system. The working medium of the high-temperature smoke-gas valve is high-temperature smoke gas, the temperature can reach over 600 ℃, the operation is frequent and rapid, and the requirements on the precision, the sealing property and the reliability of the valve are very high. In the prior art, the performance of the valve can be verified whether the valve meets the requirements or not through testing. However, most of the existing valve testing systems are liquid in medium, single in function, fixed in equipment, manual in testing process, low in testing efficiency, accuracy and precision, and difficult to completely meet the actual working condition of the use of the back pressure valve, and cannot be flexibly changed according to testing requirements. The back pressure valve manufacturers in China generally adopt liquid media or normal temperature gas media to simply test the valves, and judge whether the performance is qualified or not by combining human. Because the pressure and the high-temperature medium behind the simulation valve do not exist, the real performance of the valve under the actual working condition cannot be obtained. Often, when the machine is matched for testing, the performance problem of the valve is discovered, so that rework and huge economic loss are caused. At present, liquid media or normal-temperature gas media are mostly adopted for testing the back pressure valve in the industry, and the running performance of the back pressure valve when high-temperature gas is used as the media cannot be simulated. According to the application, the heating unit 2 is additionally arranged in front of the testing unit 6, so that high-temperature gas is used as a testing medium of the first backpressure valve 64, the operation condition of the first backpressure valve 64 under the high-temperature gas medium is simulated, relevant experimental data are obtained, and reference is provided for the subsequent design optimization and improvement of the first backpressure valve 64. It is understood that the specific type, model and specification of the heater 21 can be selected and adjusted according to the actual situation.
As shown in fig. 1, in some embodiments of the present application, the heating unit 2 further includes a surge tank 22; the surge tank 22 is connected in series with an outlet of the heater 21, and the surge tank 22 stabilizes the pressure of the gas obtained after the gas is heated by the heater 21. It will be appreciated that the heated gas will have a certain pressure rise and the surge tank 22 described above is required in order to achieve a steady flow of heated gas before it enters the test unit 6, so that the data measured by the various meters will fluctuate less and more accurately. The specific adopted specification and size of the surge tank 22 can be selected and adjusted according to actual requirements.
In some embodiments of the present application, the test system further comprises a cooling unit 9; the inlet of the cooling unit 9 is connected with the outlet of the testing unit 6 in series, and the outlet of the cooling unit 9 is communicated with the outside of the testing system; the cooling unit 9 cools the gas leaving the testing unit 6 and discharges the cooled gas to the outside of the testing system; the cooling unit 9 includes a cooler 92, a first cut valve 91, and a second cut valve 93; one end of the first stop valve 91 and one end of the second stop valve 93 are respectively connected in series with the cooler 92, the other end of the first stop valve 91 is communicated with a cooling water inlet, and the other end of the second stop valve 93 is communicated with a cooling water outlet. It will be appreciated that the gas leaving the test unit 6 after the first backpressure valve 64 is tested still has a high temperature, and if it is discharged directly to the outside of the test system, it may cause environmental pollution or damage to nearby testers, so that it is necessary to provide the cooling unit 9 to make the high temperature gas reach the discharge standard.
As shown in fig. 1, in some embodiments of the present application, the test system further includes a flow regulating unit 3; the flow regulating unit 3 is connected in series between the outlet of the heating unit 2 and the inlet of the testing unit 6, and regulates the flow of the gas before entering the testing unit 6. By controlling the flow regulating unit 3 to control the flow of the gas entering the testing unit 6, experimental data indexes of the first backpressure valve 64 under different flow rates are obtained, so that the performance of the first backpressure valve 64 can be known in more precise and detailed, and optimization, improvement and adjustment can be conveniently carried out on the first backpressure valve 64 in subsequent design.
As shown in fig. 1, in some embodiments of the present application, the flow regulating unit 3 includes a plurality of pipes arranged in parallel; the inlet of each pipeline is communicated with the outlet of the heating unit 2, an electric valve 31 is arranged on each pipeline, and each electric valve 31 is controlled by the data acquisition and monitoring unit 10 to open and close to switch each pipeline. By controlling the electric valve 31, and thus controlling the opening and closing of each pipeline in the flow regulating unit 3, the flow of the gas entering the testing unit 6 is precisely controlled, so that the obtained data about the first backpressure valve 64 is more precise and reliable, and the subsequent optimization design improvement of the first backpressure valve 64 is facilitated. It should be understood that the specific type and specification of the electric valve 31 can be selected and adjusted according to actual requirements, and other valves with different structures can be adopted to achieve the same effects of opening and closing and switching the pipeline. The data acquisition and monitoring unit 10 is controlled to control the opening or closing of the electric valves 31 in the pipelines, so that the switching between the pipelines is realized, the test requirements of the first backpressure valves 64 with different specifications are met, and the test requirements of the same first backpressure valve 64 under different flow conditions can also be met, therefore, the test system provided by the application has stronger universality and higher test efficiency.
As shown in fig. 1, in some embodiments of the present application, the test system further comprises a bypass branch and a bypass valve 4; the inlet of the bypass valve 4 is connected in series between the outlet of the flow regulating unit 3 and the inlet of the testing unit 6, and the outlet of the bypass valve 4 is communicated with the bypass branch. When the first backpressure valve 64 is in failure, the bypass valve 4 can be opened to enable the gas input into the test system to be discharged to the outside of the test system through the bypass branch, so that the problems of explosion or damage of instruments and pipelines caused by overhigh air pressure inside the test system can be prevented. In addition, if the first pressure sensor 63 located before the inlet of the first back pressure valve 64 detects that the pre-valve pressure of the first back pressure valve 64 exceeds the allowable working pressure of the first back pressure valve 64, rapid exhaust decompression can be achieved by opening the bypass valve 4, thereby protecting the valves.
As shown in fig. 1, in some embodiments of the present application, a first flow meter 5 is connected in series between an outlet of the flow regulating unit 3 and an inlet of the testing unit 6, and the first flow meter 5 is located between an inlet of the bypass valve 4 and an inlet of the testing unit 6; a second flowmeter 7 is connected in series between the outlet of the testing unit 6 and the inlet of the cooling unit 9. It is understood that the first backpressure valve 64 can have different specifications and design differences, so that different performance performances can be obtained under different experimental conditions, and the flow characteristic curve of the first backpressure valve 64 is drawn by acquiring the first flow meter 5 and the second flow meter 7 under different experimental conditions to obtain the flow data before and after the first backpressure valve 64, so as to provide a credible reference data index for a designer to optimize the structural design of the first backpressure valve 64.
In some embodiments of the present application, as shown in fig. 1, the test system further comprises a second backpressure valve 8, the second backpressure valve 8 being connected in series between the second flow meter 7 and the inlet of the cooling unit 9. It can be understood that the back pressure after different valves may adversely affect the performance of the first back pressure valve 64, and the present application realizes the simulation of the working condition performance of the first back pressure valve 64 under different valve back pressure feedbacks by serially connecting the second back pressure valve 8 behind the valve of the first back pressure valve 64, and obtains corresponding experimental data, thereby providing a reliable experimental data reference for designers to optimize and improve the first back pressure valve 64.
Example 2
In some embodiments of the present application, as shown in fig. 1, a method of testing a back pressure valve employs a testing system comprising: a test unit 6 for testing the first backpressure valve 64; the gas supply unit 1 supplies gas to the test unit 6, and an outlet of the gas supply unit 1 is communicated with an inlet of the test unit 6; the data acquisition and monitoring unit 10 is used for monitoring and controlling the test unit 6 and the gas supply unit 1 and acquiring data; the test method comprises the following steps: step one, starting the gas supply unit 1 to supply gas to the test unit 6 and the first backpressure valve 64; and step two, controlling the data acquisition and monitoring unit 10, and further monitoring and controlling the gas supply unit 1 and the test unit 6. The test system and the test method can simulate the actual working condition of the first backpressure valve 64 so as to obtain the performance data of the first backpressure valve 64 under the actual working condition.
In some embodiments of the present application, as shown in fig. 1, the test unit 6 includes a first temperature sensor 62, a first pressure sensor 63, a second pressure sensor 66, and a second temperature sensor 67; the inlet of the test unit 6, the first temperature sensor 62, the first pressure sensor 63 and the inlet of the first backpressure valve 64 are sequentially connected in series, and the first backpressure valve 64, the second pressure sensor 66, the second temperature sensor 67 and the outlet of the test unit 6 are sequentially connected in series; the first temperature sensor 62 monitors the inlet air temperature of the first backpressure valve 64, the first pressure sensor 63 monitors the inlet air pressure of the first backpressure valve 64, the second pressure sensor 66 monitors the outlet air pressure of the first backpressure valve 64, and the second pressure sensor 66 monitors the outlet air temperature of the first backpressure valve 64; in the testing method, the second step further includes collecting the inlet temperature, the inlet pressure, the outlet temperature, and the outlet pressure of the first backpressure valve 64 through the data collecting and monitoring unit 10. The above data may provide a well-documented experimental data reference for optimizing and improving the structural design of the first back pressure valve 64.
In some embodiments of the present disclosure, as shown in fig. 1, the test unit 6 further includes a displacement sensor 65; the displacement sensor 65 is connected in series with the first backpressure valve 64 and monitors the response time of the first backpressure valve 64; in the test method, the first step further includes, within a first opening range of the first backpressure valve 64, adjusting the opening of the first backpressure valve 64 every first opening interval; the second step further includes that the data collecting and monitoring unit 10 collects data of the displacement sensor 65 under different opening degrees. The first opening range can be selected and adjusted according to actual requirements, and can be 25 to 75 percent, 15 to 80 percent, 30 to 90 percent, 45 to 85 percent, or 50 to 60 percent, for example; the first opening interval may also be selected and adjusted according to actual requirements, and may be, for example, 1%, 2%, 5%, or 10%. It is understood that the displacement sensor 65 has a signal when the valve stem in the first back pressure valve 64 is operated; when the valve stem in the first back pressure valve 64 is not moved, the displacement sensor 65 does not have a signal; the present application monitors the movement of the valve stem in the first backpressure valve 64 via the displacement sensor 65 to record the length of time required for each actuation of the first backpressure valve 64.
In some embodiments of the present disclosure, as shown in fig. 1, in the testing system, the air supply unit 1 includes an air inlet 11, a filter 12, and a blower 13 connected in series; the gas inlet 11 is communicated with the outside of the test system, and the blower 13 pumps gas from the gas inlet 11 into the test unit 6; in the testing method, the first step further includes activating the blower 13 to pump gas from the gas inlet 11 into the testing unit 6.
As shown in fig. 1, in some embodiments of the present application, the test system further comprises a heating unit 2; the heating unit 2 is connected in series between the outlet of the gas supply unit 1 and the inlet of the test unit 6, heats the gas supplied by the gas supply unit 1, and the heated gas enters the test unit 6; the heating unit 2 comprises a heater 21 and a surge tank 22, the heater 21 heats the gas supplied by the gas supply unit 1, the surge tank 22 is connected in series with an outlet of the heater 21, and the surge tank 22 stabilizes the pressure of the gas heated by the heater 21; in the testing method, in the first step, before the blower 13 is started, the heater 21 is started and preheated, and the gas enters the surge tank 22 after being heated and then leaves the heating unit 2. At present, liquid medium or gas medium at normal temperature is mostly adopted for testing the back pressure valve in the industry, and the running performance of the back pressure valve taking high-temperature gas as the medium cannot be simulated. According to the application, the heating unit 2 is additionally arranged in front of the testing unit 6, so that high-temperature gas is used as a testing medium of the first backpressure valve 64, the operation condition of the first backpressure valve 64 under the high-temperature gas medium is simulated, relevant experimental data are obtained, and reference is provided for the subsequent design optimization and improvement of the first backpressure valve 64. It is understood that the specific type, model and specification of the heater 21 can be selected and adjusted according to the actual situation. It will be appreciated that the heated gas will have a certain pressure rise and the surge tank 22 described above is required in order to achieve a steady flow of heated gas before it enters the test unit 6, so that the data measured by the various meters will fluctuate less and more accurately. The specific adopted specification and size of the surge tank 22 can be selected and adjusted according to actual requirements.
As shown in fig. 1, in some embodiments of the present application, the test system further comprises a cooling unit 9; the inlet of the cooling unit 9 is connected with the outlet of the testing unit 6 in series, and the outlet of the cooling unit 9 is communicated with the outside of the testing system; the cooling unit 9 cools the gas leaving the testing unit 6 and discharges the cooled gas to the outside of the testing system; the cooling unit 9 includes a cooler 92, a first cut valve 91, and a second cut valve 93; one end of the first stop valve 91 and one end of the second stop valve 93 are respectively connected in series with the cooler 92, the other end of the first stop valve 91 is communicated with a cooling water inlet, and the other end of the second stop valve 93 is communicated with a cooling water outlet; in the testing method, the first step further includes opening the first and second cutoff valves 91 and 93, and activating the cooler 92 to cool the gas leaving the first backpressure valve 64 to be discharged to the outside of the testing system. It will be appreciated that the gas leaving the test unit 6 after the first backpressure valve 64 is tested still has a high temperature, and if it is discharged directly to the outside of the test system, it may cause environmental pollution or damage to nearby testers, and therefore, in order to avoid this problem, it is necessary to provide the cooling unit 9 to make the high temperature gas reach the discharge standard.
As shown in fig. 1, in some embodiments of the present application, the test system further includes a flow regulating unit 3; the flow regulating unit 3 is connected in series between the outlet of the heating unit 2 and the inlet of the testing unit 6, and regulates the flow of the gas before entering the testing unit 6; the flow regulating unit 3 comprises a plurality of pipelines arranged in parallel; the inlet of each pipeline is communicated with the outlet of the heating unit 2, an electric valve 31 is arranged on each pipeline, and each electric valve 31 is controlled by the data acquisition and monitoring unit 10 to be opened and closed to switch each pipeline; in the testing method, the second step further includes that the data acquisition and monitoring unit 10 controls the opening and closing of each pipeline in the flow regulating unit 3 to switch each pipeline. By controlling the flow regulating unit 3 to control the flow of the gas entering the testing unit 6, experimental data indexes of the first backpressure valve 64 under different flow rates are obtained, so that the performance of the first backpressure valve 64 can be known in more detail, and optimization, improvement and adjustment of the first backpressure valve 64 in subsequent design can be conveniently carried out.
As shown in fig. 1, in some embodiments of the present application, the test system further comprises a bypass branch and a bypass valve 4; the inlet of the bypass valve 4 is connected in series between the outlet of the flow regulating unit 3 and the inlet of the testing unit 6, and the outlet of the bypass valve 4 is communicated with the bypass branch; the testing method further comprises the first step of controlling the bypass valve 4 to open to discharge the gas from the bypass branch out of the testing system by the data acquisition and monitoring unit 10 when the first backpressure valve 64 fails or the pressure between the flow regulating unit 3 and the first backpressure valve 64 is too high. When the first backpressure valve 64 is in failure, the bypass valve 4 can be opened to enable the gas input into the test system to be discharged to the outside of the test system through the bypass branch, so that the problems of explosion or damage of instruments and pipelines caused by overhigh air pressure inside the test system can be prevented. In addition, if the first pressure sensor 63 located before the inlet of the first back pressure valve 64 detects that the pressure before the first back pressure valve 64 exceeds the allowable operating pressure of the first back pressure valve 64, rapid exhaust decompression can be achieved by opening the bypass valve 4, thereby protecting the valves.
In some embodiments of the present application, in the test system, a first flow meter 5 is connected in series between an outlet of the flow regulating unit 3 and an inlet of the test unit 6, and the first flow meter 5 is located between an inlet of the bypass valve 4 and an inlet of the test unit 6; a second flowmeter 7 is connected in series between the outlet of the testing unit 6 and the inlet of the cooling unit 9; in the test method, the first step further includes adjusting the heater 21 to make the temperature of the gas reach a target value, and collecting data of each instrument for a plurality of times within a collection time; the first step further comprises adjusting the opening degree of the first back pressure valve 64 once at intervals of a second opening degree within the range of the second opening degree of the first back pressure valve 64 and collecting data of each instrument; the second step further includes that the data acquisition and monitoring unit 10 collects data of the first flowmeter 5 and the second flowmeter 7, and draws a valve flow characteristic curve. It is understood that the first backpressure valve 64 can have different specifications and design differences, so that different performance performances can be obtained under different experimental conditions, and the flow characteristic curve of the first backpressure valve 64 is drawn by acquiring the first flow meter 5 and the second flow meter 7 under different experimental conditions to obtain the flow data before and after the first backpressure valve 64, so as to provide a credible reference data index for a designer to optimize the structural design of the first backpressure valve 64.
In some embodiments of the present application, the test system further comprises a second backpressure valve 8, and the second backpressure valve 8 is connected in series between the second flowmeter 7 and the inlet of the cooling unit 9; the first step also includes adjusting the second backpressure valve 8 to adjust the post-valve backpressure of the first backpressure valve 64. It can be understood that the back pressure after different valves may adversely affect the performance of the first back pressure valve 64, and the present application realizes the simulation of the working condition performance of the first back pressure valve 64 under different valve back pressure feedbacks by serially connecting the second back pressure valve 8 behind the valve of the first back pressure valve 64, and obtains corresponding experimental data, thereby providing a reliable experimental data reference for designers to optimize and improve the first back pressure valve 64. Also, since different valve back pressures have a large influence on the response time of the first backpressure valve 64, it is necessary to test the response time of the first backpressure valve 64 having different valve back pressures. Specifically, the data acquisition and monitoring unit 10 controls the opening of the second backpressure valve 8, specifically, the opening of the second backpressure valve 8 is adjusted once every 10%, 20% and 30% opening interval within the range of 0-100% opening, and then each index of the first backpressure valve 64 is tested every opening interval, wherein the index includes response time measured by the displacement sensor 65, the actuation flexibility of the first backpressure valve 64 can be verified through the response time data, and meanwhile, a reliable experimental basis can be provided for simulating and inspecting the performance of the backpressure valve under the backpressure fluctuation working condition of the special diesel engine.
In some embodiments of the present application, in the testing method, the method further includes detecting an external sealability of the open state of the valve: closing the second backpressure valve 8, opening the first backpressure valve 64, starting the blower 13 to pump the gas into the test system, closing the heating unit 2 and the cooling unit 9, and opening the electric valve 31 on the corresponding pipeline in the flow regulating unit 3; when the data of the first pressure sensor 63 is stabilized at the first set value, the first set time is maintained, and then the data of the first pressure sensor 63 and the second pressure sensor 66 are collected and compared. The first set value can be selected and adjusted according to actual requirements, and specifically can be 1 to 2MPa, 0.8 to 3.5MPa, 1.5 to 2.2MPa, or 1.8 to 2.7MPa, or a specific value, for example, 1.3MPa, 1.5MPa, or 1.85MPa. The first set time can also be selected and adjusted according to actual requirements, specifically can be 1-2 min, 2-4 min, 3-10 min, or a specific point value, for example, 5min, 8min or 15min. It should be noted that if the first backpressure valve 64 has good external sealing property in the open state, under the above conditions, the data measured by the first pressure sensor 63 and the data measured by the second pressure sensor 66 should be equal in value or fluctuate within a certain small range, if the data measured by the second pressure sensor 66 is slightly smaller than the data measured by the first pressure sensor 63, that is, there is a slight allowable pressure drop, and the specific value or range of the allowable pressure drop is selected according to the actual situation, and may be, for example, not more than 0.01MPa, or not more than 0.05MPa, or not more than 0.005MPa, etc. The valve tightness test in the prior art needs manual judgment, and has higher subjectivity, so the accuracy is poorer, and the efficiency is not high; the test system and the test method are fast, simple and convenient and have high accuracy.
In some embodiments of the present application, the testing method further includes, in a valve closed state, detecting internal and external sealability: opening the second backpressure valve 8, opening the first backpressure valve 64, starting the blower 13 to pump the gas into the test system, closing the heating unit 2 and the cooling unit 9, and opening the electric valve 31 on the corresponding pipeline in the flow regulating unit 3; when the data of the first pressure sensor 63 is stabilized at a second set value, the corresponding electric valve 31 on the pipeline in the flow rate adjusting unit 3 is closed, the first backpressure valve 64 is closed, a second set time is kept, and the data of the first pressure sensor 63 is collected and compared with the second set value. The second set value may be selected and adjusted according to actual requirements, and specifically may be 1 to 2MPa, 0.8 to 3.5MPa, 1.5 to 2.2MPa, or 1.8 to 2.7MPa, or a specific point value, for example, 1.3MPa, 1.5MPa, or 1.85MPa. The second setting time may also be selected and adjusted according to actual requirements, specifically may be 1 to 2min, 2 to 4min, 3 to 10min, or a specific point value, for example, 5min, 8min, or 15min. It should be noted that if the first backpressure valve 64 has good internal and external sealing performance in the closed state, under the above conditions, the data measured by the first pressure sensor 63 and the data measured by the second pressure sensor 66 should be equal in value or fluctuate within a certain small range, if the data measured by the second pressure sensor 66 is slightly smaller than the data measured by the first pressure sensor 63, that is, there is a slight allowable pressure drop, and the specific value or range of the allowable pressure drop is selected according to the actual situation, and may be, for example, not more than 0.01MPa, or not more than 0.05MPa, or not more than 0.005MPa, etc. The valve tightness test in the prior art needs manual judgment, and has larger subjectivity, so the accuracy is poorer, and the efficiency is not high; the test system and the test method are quick, convenient and high in accuracy.
The testing system and the testing method provided by the application do not need manual operation, have high automation degree, can realize the automatic testing of the flow characteristic, the response time and the sealing performance of the valve, and improve the accuracy of the testing structure and the efficiency of the testing work.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. In addition, the principle and the implementation manner of the present application are explained by applying specific examples in the specification, the above description of the embodiments is only for helping understanding the method and the core idea of the present application, and the content of the present application should not be construed as limiting the present application.
Claims (25)
1. A system for testing a backpressure valve, the system comprising:
a test unit (6) for testing the first backpressure valve (64);
the gas supply unit (1) supplies gas to the test unit (6), and an outlet of the gas supply unit (1) is communicated with an inlet of the test unit (6);
and the data acquisition and monitoring unit (10) is used for monitoring and controlling the test unit (6) and the gas supply unit (1) and acquiring data.
2. The testing system according to claim 1, characterized in that the testing unit (6) comprises a first temperature sensor (62), a first pressure sensor (63), a second pressure sensor (66) and a second temperature sensor (67);
an inlet of the testing unit (6), a first temperature sensor (62), a first pressure sensor (63) and an inlet of a first backpressure valve (64) are sequentially connected in series, and an outlet of the first backpressure valve (64), an outlet of a second pressure sensor (66), an outlet of a second temperature sensor (67) and an outlet of the testing unit (6) are sequentially connected in series;
the first temperature sensor (62) monitors an inlet air temperature of the first backpressure valve (64), the first pressure sensor (63) monitors an inlet air pressure of the first backpressure valve (64), the second pressure sensor (66) monitors an outlet air pressure of the first backpressure valve (64), and the second pressure sensor (66) monitors an outlet air temperature of the first backpressure valve (64).
3. The testing system according to claim 2, characterized in that the testing unit (6) further comprises a first reducing pipe (60) and a second reducing pipe (61);
the first reducing pipe (60) is connected in series between an inlet of the test unit (6) and the first temperature sensor (62), and the second reducing pipe (61) is connected in series between an outlet of the test unit (6) and the second temperature sensor (67).
4. The testing system according to claim 2, characterized in that the testing unit (6) further comprises a displacement sensor (65);
the displacement sensor (65) is connected in series with the first backpressure valve (64) and monitors the response time of the first backpressure valve (64).
5. The testing system according to claim 1, characterized in that the air supply unit (1) comprises an air inlet (11), a filter (12) and a blower (13) connected in series in this order;
the gas inlet (11) is in communication with the exterior of the test system, and the blower (13) pumps gas from the gas inlet (11) into the test cell (6).
6. The test system according to claim 1, further comprising a heating unit (2);
the heating unit (2) is connected in series between the outlet of the gas supply unit (1) and the inlet of the testing unit (6), heats the gas supplied by the gas supply unit (1), and the heated gas enters the testing unit (6);
the heating unit (2) includes a heater (21), and the heater (21) heats the gas supplied by the gas supply unit (1).
7. The test system according to claim 6, wherein the heating unit (2) further comprises a surge tank (22);
the pressure stabilizing tank (22) is connected with an outlet of the heater (21) in series, and the pressure stabilizing tank (22) stabilizes the pressure of the gas obtained after the gas is heated by the heater (21).
8. The test system according to claim 1, further comprising a cooling unit (9);
the inlet of the cooling unit (9) is connected with the outlet of the testing unit (6) in series, and the outlet of the cooling unit (9) is communicated with the outside of the testing system;
the cooling unit (9) cools the gas leaving the testing unit (6) and discharges the cooled gas to the outside of the testing system;
the cooling unit (9) comprises a cooler (92), a first stop valve (91) and a second stop valve (93);
one end of the first stop valve (91) and one end of the second stop valve (93) are respectively connected with the cooler (92) in series, the other end of the first stop valve (91) is communicated with a cooling water inlet, and the other end of the second stop valve (93) is communicated with a cooling water outlet.
9. The test system according to claim 1, characterized in that it further comprises a flow regulating unit (3);
the flow regulating unit (3) is connected in series between the outlet of the heating unit (2) and the inlet of the testing unit (6), and regulates the flow of the gas before entering the testing unit (6).
10. The testing system according to claim 9, characterized in that the flow regulating unit (3) comprises a plurality of parallel arranged pipes;
the inlet of each pipeline is communicated with the outlet of the heating unit (2), an electric valve (31) is arranged on each pipeline, and each electric valve (31) is controlled by the data acquisition and monitoring unit (10) to be opened and closed to switch each pipeline.
11. The test system according to claim 9, further comprising a bypass branch and a bypass valve (4);
the inlet of the bypass valve (4) is connected in series between the outlet of the flow regulating unit (3) and the inlet of the testing unit (6), and the outlet of the bypass valve (4) is communicated with the bypass branch.
12. A test system according to claim 11, characterised in that a first flow meter (5) is connected in series between the outlet of the flow regulating unit (3) and the inlet of the test unit (6), and that the first flow meter (5) is located between the inlet of the bypass valve (4) and the inlet of the test unit (6);
and a second flowmeter (7) is connected in series between the outlet of the testing unit (6) and the inlet of the cooling unit (9).
13. The test system according to claim 12, characterized in that it further comprises a second backpressure valve (8), said second backpressure valve (8) being connected in series between said second flowmeter (7) and an inlet of said cooling unit (9).
14. A method of testing a back pressure valve, using a test system comprising:
a test unit (6) for testing the first backpressure valve (64);
the gas supply unit (1) supplies gas to the test unit (6), and an outlet of the gas supply unit (1) is communicated with an inlet of the test unit (6);
the data acquisition and monitoring unit (10) is used for monitoring and controlling the test unit (6) and the gas supply unit (1) and acquiring data;
the test method comprises the following steps:
step one, starting the gas supply unit (1) to supply gas to the test unit (6) and the first backpressure valve (64);
and step two, controlling the data acquisition and monitoring unit (10) so as to monitor and control the gas supply unit (1) and the test unit (6).
15. The testing method according to claim 14, characterized in that in the testing system, the testing unit (6) comprises a first temperature sensor (62), a first pressure sensor (63), a second pressure sensor (66) and a second temperature sensor (67); an inlet of the testing unit (6), a first temperature sensor (62), a first pressure sensor (63) and an inlet of a first backpressure valve (64) are sequentially connected in series, and an outlet of the first backpressure valve (64), an outlet of a second pressure sensor (66), an outlet of a second temperature sensor (67) and an outlet of the testing unit (6) are sequentially connected in series; the first temperature sensor (62) monitors an inlet air temperature of the first backpressure valve (64), the first pressure sensor (63) monitors an inlet air pressure of the first backpressure valve (64), the second pressure sensor (66) monitors an outlet air pressure of the first backpressure valve (64), and the second pressure sensor (66) monitors an outlet air temperature of the first backpressure valve (64);
in the testing method, the second step further comprises the step of collecting the inlet air temperature, the inlet air pressure, the outlet air temperature and the outlet air pressure of the first backpressure valve (64) through the data acquisition and monitoring unit (10).
16. The testing method according to claim 15, characterized in that in the testing system, the testing unit (6) further comprises a displacement sensor (65); the displacement sensor (65) is connected in series with the first backpressure valve (64) and monitors the response time of the first backpressure valve (64);
in the test method, the first step further comprises the step of adjusting the opening degree of the first backpressure valve (64) once every other first opening degree interval within the range of the first opening degree of the first backpressure valve (64);
the second step further comprises that the data acquisition and monitoring unit (10) collects data of the displacement sensors (65) under different opening degrees.
17. The testing method according to claim 16, wherein in the testing system, the air supply unit (1) comprises an air inlet (11), a filter (12) and a blower (13) which are connected in series in sequence; the gas inlet (11) is communicated with the outside of the test system, and the blower (13) pumps gas from the gas inlet (11) to the test unit (6);
in the testing method, the first step further comprises the step of starting the air blower (13) to pump the gas from the gas inlet (11) into the testing unit (6).
18. The testing method according to claim 17, characterized in that the testing system further comprises a heating unit (2); the heating unit (2) is connected in series between the outlet of the gas supply unit (1) and the inlet of the testing unit (6), heats the gas supplied by the gas supply unit (1), and the heated gas enters the testing unit (6); the heating unit (2) comprises a heater (21) and a pressure stabilizing tank (22), the heater (21) heats the gas supplied by the gas supply unit (1), the pressure stabilizing tank (22) is connected with an outlet of the heater (21) in series, and the pressure stabilizing tank (22) stabilizes the pressure of the gas obtained after the gas is heated by the heater (21);
in the test method, in the first step, before starting the blower (13), the method further comprises the steps of starting the heater (21) and preheating, wherein the gas enters the surge tank (22) after being heated and then leaves the heating unit (2).
19. The testing method according to claim 18, characterized in that the testing system further comprises a cooling unit (9); the inlet of the cooling unit (9) is connected with the outlet of the testing unit (6) in series, and the outlet of the cooling unit (9) is communicated with the outside of the testing system; the cooling unit (9) cools the gas leaving the testing unit (6) and discharges the cooled gas to the outside of the testing system; the cooling unit (9) comprises a cooler (92), a first stop valve (91) and a second stop valve (93); one end of the first stop valve (91) and one end of the second stop valve (93) are respectively connected with the cooler (92) in series, the other end of the first stop valve (91) is communicated with a cooling water inlet, and the other end of the second stop valve (93) is communicated with a cooling water outlet;
in the test method, the first step further comprises opening the first and second shut-off valves (91, 93) and activating the cooler (92) to cool the gas leaving the first backpressure valve (64) for discharge to the outside of the test system.
20. The testing method according to claim 19, characterized in that the testing system further comprises a flow regulating unit (3); the flow regulating unit (3) is connected in series between the outlet of the heating unit (2) and the inlet of the testing unit (6), and regulates the flow of the gas before entering the testing unit (6); the flow regulating unit (3) comprises a plurality of pipelines which are arranged in parallel; the inlet of each pipeline is communicated with the outlet of the heating unit (2), an electric valve (31) is arranged on each pipeline, and each electric valve (31) is controlled by the data acquisition and monitoring unit (10) to be opened and closed to switch each pipeline;
in the testing method, the second step further includes that the data acquisition and monitoring unit (10) controls the opening and closing of each pipeline in the flow regulating unit (3) to switch each pipeline.
21. The testing method according to claim 20, characterized in that the testing system further comprises a bypass branch and a bypass valve (4); the inlet of the bypass valve (4) is connected in series between the outlet of the flow regulating unit (3) and the inlet of the testing unit (6), and the outlet of the bypass valve (4) is communicated with the bypass branch;
the test method further comprises, step one, the step one further comprising, when the first backpressure valve (64) fails or the pressure between the flow regulating unit (3) and the first backpressure valve (64) is too high, the data acquisition and monitoring unit (10) controlling the bypass valve (4) to open to vent the gas from the bypass branch out of the test system.
22. A testing method according to claim 21, characterized in that in the testing system a first flow meter (5) is connected in series between the outlet of the flow regulating unit (3) and the inlet of the testing unit (6), and that the first flow meter (5) is located between the inlet of the bypass valve (4) and the inlet of the testing unit (6); a second flowmeter (7) is connected in series between the outlet of the test unit (6) and the inlet of the cooling unit (9);
in the test method, the first step further comprises adjusting the heater (21) to make the temperature of the gas reach a target value, and collecting data of each instrument for multiple times within a collection time;
the first step also comprises that the opening degree of the first backpressure valve (64) is adjusted once every second opening degree interval within the second opening degree range of the first backpressure valve (64) and the data of each instrument is collected;
the second step further comprises that the data acquisition and monitoring unit (10) collects data of the first flowmeter (5) and the second flowmeter (7) and draws a valve flow characteristic curve.
23. A test method according to claim 22, characterized in that in the test system, it further comprises a second backpressure valve (8), the second backpressure valve (8) being connected in series between the second flowmeter (7) and the inlet of the cooling unit (9);
the step one also comprises adjusting the second backpressure valve (8) so as to adjust the back pressure after the first backpressure valve (64).
24. The method as claimed in claim 23, further comprising the step of detecting the external sealability in the open state of the valve by: -closing the second backpressure valve (8), -opening the first backpressure valve (64), -starting the blower (13) to pump the gas into the test system, -closing the heating unit (2) and the cooling unit (9), -opening the electric valve (31) on the respective line in the flow regulation unit (3);
when the data of the first pressure sensor (63) is stabilized at a first set value, a first set time is maintained, and then the data of the first pressure sensor (63) and the data of the second pressure sensor (66) are collected and compared.
25. The method as claimed in claim 24, further comprising, in a valve closed state, internal and external tightness detection: -opening the second backpressure valve (8), opening the first backpressure valve (64), starting the blower (13) to pump the gas into the test system, closing the heating unit (2) and the cooling unit (9), opening the electric valve (31) on the respective line in the flow regulation unit (3);
when the data of the first pressure sensor (63) are stabilized at a second set value, closing the corresponding electric valve (31) on the pipeline in the flow regulating unit (3), closing the first backpressure valve (64), keeping for a second set time, collecting the data of the first pressure sensor (63) and comparing with the second set value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211009979.XA CN115371892A (en) | 2022-08-22 | 2022-08-22 | System and method for testing back pressure valve |
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| CN202211009979.XA CN115371892A (en) | 2022-08-22 | 2022-08-22 | System and method for testing back pressure valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115876456A (en) * | 2023-03-03 | 2023-03-31 | 博鼎精工智能科技(山东)有限公司 | Poppet valve testing arrangement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115876456A (en) * | 2023-03-03 | 2023-03-31 | 博鼎精工智能科技(山东)有限公司 | Poppet valve testing arrangement |
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