CN109596339B - Automatic control system and method for safety valve type test - Google Patents
Automatic control system and method for safety valve type test Download PDFInfo
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- CN109596339B CN109596339B CN201910022335.6A CN201910022335A CN109596339B CN 109596339 B CN109596339 B CN 109596339B CN 201910022335 A CN201910022335 A CN 201910022335A CN 109596339 B CN109596339 B CN 109596339B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001502 supplementing effect Effects 0.000 claims abstract description 47
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 239000013589 supplement Substances 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims description 51
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
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Abstract
The invention discloses an automatic control system and method for a safety valve type test, wherein the automatic control system for the safety valve type test comprises a control unit, a test container, a first storage container, an air inlet booster pipeline, at least one air supplementing and pressure stabilizing pipeline and a first pressure detection unit; the air inlet boosting pipeline is connected between the first storage container and the test container; the air supplementing and pressure stabilizing pipeline is connected between the first storage container and the test container; the first pressure detection unit is arranged on the test container; the control unit is in communication connection with the air inlet pressure boosting pipeline, the air supplementing pressure stabilizing pipeline and the first pressure detection unit, controls the opening and closing of the air inlet pressure boosting pipeline and controls the opening and closing of the air supplementing pressure stabilizing pipeline. The automatic control and measurement of the safety valve type test automatic control system are realized by arranging the control unit; the additional air supplementing and pressure stabilizing pipeline supplements air for the test container, meets the requirement of a large amount of air supplementing after the safety valve is opened, maintains the pressure stability of the test container, and improves the accuracy of the safety valve type test.
Description
Technical Field
The invention relates to the technical field of safety valves, in particular to an automatic control system and method for a safety valve type test.
Background
The safety valve is a safety accessory of special equipment, and according to the requirements of national special equipment safety technical specifications: the safety valve manufacturing factory should carry out the "safety valve type test" before producing and manufacturing the safety valve, and the qualified back of type test can be produced, put into market.
The safety valve type test is generally performed by: generating power device-power source storage device (storage container) -measuring control device-type test container.
The safety valve type test is characterized in that: before the test starts, in order to meet the requirement of test measurement precision, the test container for the specified type test has slow boosting speed (the boosting speed specified by the national standard cannot exceed 0.01 MPa/s), and the air inflow is small; the safety valve reaches the set pressure, the safety valve is opened, the safety valve is used for exhausting a large amount of air, and a large amount of air supplementing is needed to ensure that the test system completes the test of various parameters, in particular the test of the discharge amount of the safety valve, in order to ensure that the safety valve is stably under a certain discharge pressure when being discharged.
The test conditions for the discharge amount of the safety valve require: the discharge pressure is stable, the opening height of the valve rod of the safety valve is stable, and the discharge flow of the safety valve is stable. To meet this test condition, we need to quickly replenish the test medium in large quantities when the safety valve is opened, ensuring stable discharge during the discharge process of the safety valve, so as to ensure accurate test.
The safety valve requires a large replenishment of test medium from before opening to the discharge of the safety valve to ensure stable discharge of the safety valve. However, due to the performance of the prior equipment technology, one of key devices of the type test device, namely an adjusting valve, is difficult to realize one-step and one-time adjustment of the air supplementing quantity so as to meet the discharge requirement of the safety valve. Therefore, multiple continuous adjustments are required, and at the same time, a sufficient amount of experience is required to meet the needs of the test.
The characteristics of the relief valve discharge process are summarized as follows: the system flow before the safety valve is opened is small, the flow after the safety valve is opened and discharged is large, and a large amount of test medium needs to be rapidly (within less than 1 second) supplemented in the safety valve opening stage of the test process to meet the requirements.
At present, due to the technical characteristics and limitations of system equipment, the operation of the existing device is manual operation, and the manual influence factor is large, so that the test result is not objective enough, the degree of automation is not high, and the automatic control cannot be realized, because the following reasons are:
Referring to fig. 1, when the tested relief valve is not opened, the flow rate of the medium flowing through the regulating valve is small, for example, about 2% of the opening degree. After the tested safety valve is opened, a large amount of air is needed, the regulating valve needs to be opened from a smaller opening degree to a larger opening degree, and the opening degree depends on the exhaust capacity of the tested safety valve. Because the discharge capacity of the tested safety valve is difficult to be accurately matched by the regulating valve, the pressure fluctuation of the test container can be caused by the mismatching of the air inflow and the air displacement of the test container, and the pressure stability is difficult to realize. Meanwhile, due to the fact that the air is supplemented by the regulating valve, the test medium continuously flows from the storage container to the test container, and the flow rate of the test medium flowing to the test container is large, so that the pressure of the storage container is suddenly reduced, the regulating opening of the regulating valve is required to be considered to be not only the pressure reduction of the test container, but also the sudden pressure reduction of the storage container, namely, on one hand, the discharge air displacement of the tested safety valve is required to be ensured, and on the other hand, the opening of the regulating valve is required to be increased due to the pressure reduction of the storage container so as to ensure the flow stability of the regulating valve. The pressure of both the test vessel and the storage vessel drops sharply, however, the displacement of the safety valve under test (the gas supply amount of the regulator valve) does not change. Thus, matching the air supply capacity of the regulator valve to the discharge of the tested safety valve is particularly difficult. In addition, due to the compressibility of the gaseous medium, when the quantity of the gaseous medium discharged by the tested safety valve and the gaseous medium entering the test container through the regulating valve is unbalanced, the pressure index displayed by the system has certain hysteresis, and certain difficulty is brought to accurate adjustment.
Based on the above reasons, the current safety valve type test manually operated by human can not realize automatic control, and the human influence factors can make the test result not objective enough, and the reproducibility of the test result is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safety valve type test automatic control system and a safety valve type test automatic control method for realizing automatic operation control of a safety valve type test.
The technical scheme adopted for solving the technical problems is as follows: the automatic control system for the safety valve type test comprises a control unit, a test container, a first storage container, an air inlet boosting pipeline, at least one air supplementing and pressure stabilizing pipeline and a first pressure detection unit, wherein the test container is used for being connected with a tested safety valve;
The air inlet boosting pipeline is connected between the first storage container and the test container, and is used for supplying the test medium stored in the first storage container to the test container; the air supplementing and pressure stabilizing pipeline is connected between the first storage container and the test container and is used for supplementing air and stabilizing pressure for the test container;
The first pressure detection unit is arranged on the test container, detects the pressure change of the test container and sends a detected first pressure change signal to the control unit;
The control unit is in communication connection with the air inlet pressure boosting pipeline, the air supplementing pressure stabilizing pipeline and the first pressure detection unit, controls the opening and closing of the air inlet pressure boosting pipeline, and controls the opening and closing of the air supplementing pressure stabilizing pipeline according to the first pressure change signal.
Preferably, the air inlet boost pipeline comprises a first pipeline connected between the first storage container and the test container, a first regulating valve arranged on the first pipeline and a first differential pressure flowmeter; the control unit is in communication connection with the first regulating valve and controls the opening and the opening of the first regulating valve;
The air supplementing and stabilizing pipeline comprises a second pipeline connected between the first storage container and the test container, a second regulating valve and a second differential pressure flowmeter, wherein the second regulating valve and the second differential pressure flowmeter are arranged on the second pipeline; the control unit is in communication connection with the second regulating valve and controls the opening and the opening of the second regulating valve.
Preferably, the first differential pressure flow meter comprises a plurality of first differential pressure transmitters;
the second differential pressure flow meter includes a plurality of second differential pressure transmitters.
Preferably, the safety valve type test automatic control system further comprises a second storage container, a gas supplementing line connected between the second storage container and the first storage container, and a second pressure detecting unit installed on the first storage container to detect a pressure change of the first storage container;
The second pressure detection unit is in communication connection with the control unit and sends a detected second pressure change signal to the control unit;
The control unit is in communication connection with the air supplementing pipeline and controls the opening and closing of the air supplementing pipeline according to the received second pressure change signal.
Preferably, the air supplementing pipeline comprises a third pipeline connected between the second storage container and the first storage container, and a third regulating valve arranged on the third pipeline;
The control unit is in communication connection with the third regulating valve and controls the opening and the opening of the third regulating valve.
Preferably, the pressure of the second storage container is higher than the pressure of the first storage container, and the pressure ratio between the second storage container and the first storage container is less than or equal to 4.
Preferably, the safety valve type test automatic control system further comprises a power generator, a third pipe connected between the power generator and the second storage container, and a shut-off valve provided on the fourth pipe.
Preferably, the automatic control system for the safety valve type test further comprises a height opening tester which is connected with the tested safety valve and detects the opening height of the valve rod of the tested safety valve; the control unit is in communication connection with the height opening tester and receives a height opening signal sent by the height opening tester.
The invention also provides a safety valve type test automatic control method, which adopts the safety valve type test automatic control system, and comprises the following steps:
S1, a control unit sends out a command to open an air inlet boosting pipeline, so that test media of a first storage container flow into a test container, and the boosting speed of the test container is controlled to be not more than 0.01MPa/S;
S2, after the pressure of the test container is increased to the set pressure, the tested safety valve is opened to exhaust at the preset exhaust pressure;
S3, the control unit sends out a command to open a gas supplementing and pressure stabilizing pipeline, so that test media of the first storage container are supplemented to the test container through the gas supplementing and pressure stabilizing pipeline, the relative stability of the pressure of the test container is maintained, and the exhaust quantity and the air inflow of the tested safety valve are balanced;
And S4, when the pressure of the test container is stabilized at the preset discharge pressure and the opening height of the valve rod of the tested safety valve is stabilized at a set value, the control unit acquires the pressure value detected by the first pressure detection unit on the test container, the opening height value of the valve rod of the tested safety valve and the flow value of the air inlet boosting pipeline, and the type test of the tested safety valve is completed.
Preferably, in step S2, the height-opening tester detects the valve rod opening height of the tested safety valve and sends the detected height-opening signal to the control unit; in step S3, the control unit sends a command to open the air-supplementing and pressure-stabilizing pipeline according to the received high-opening signal.
Preferably, in step S3, the control unit sends an instruction to open the air supply pipeline according to the first pressure change signal detected by the second pressure detecting unit on the first storage container, so that the second storage container supplements air for the first storage container, and the pressure of the first storage container is maintained relatively stable.
The invention has the beneficial effects that: the automatic control and measurement of the safety valve type test automatic control system are realized by arranging a control unit; the air supplementing and stabilizing pipeline is additionally arranged to supplement air for the test container, so that the requirement of a large amount of air supplementing after the safety valve is opened is met, meanwhile, the pressure stability of the test container is maintained, and the accuracy of the safety valve type test is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a prior art safety valve type test flow;
FIG. 2 is a block diagram of the connection of a safety valve type test automatic control system according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 2, the automatic control system for safety valve type test according to an embodiment of the present invention may include a control unit 10, a test container 20, a first storage container 31, an air intake pressure increasing pipe 40, at least one air supply pressure stabilizing pipe 50, and a first pressure detecting unit 61.
The test container 20 is used for connecting the tested safety valve 1 and supplying air to the tested safety valve 1 for pattern test; the safety valve under test 1 can be mounted directly on the test vessel 20. The air intake pressure increasing line 40 is connected between the first storage container 31 and the test container 20, and supplies the test medium (typically, gas) stored in the first storage container 31 to the test container 20. The air supply and pressure stabilization pipeline 50 is connected between the first storage container 31 and the test container 20, and is used for supplying air to the test container 20 so as to enable the pressure of the test container 20 to be relatively stable. The first pressure detecting unit 61 is mounted on the test container 20, detects a pressure change of the test container 20, and transmits a detected first pressure change signal to the control unit 10. The control unit 10 is in communication connection with the air inlet boost pipeline 40, the air supplementing and stabilizing pipeline 50 and the first pressure detection unit 61, controls the opening and closing of the air inlet boost pipeline 40, and controls the opening and closing of the air supplementing and stabilizing pipeline 50 according to the first pressure change signal.
The air inlet booster pipeline 40 is used for supplying a small amount of air to the test container 20, so that the slow booster (not more than 0.01MPa/s specified by the national standard) of the test container 20 before the tested safety valve 1 is opened is met. The intake boost line 40 is a small line with respect to the air make-up pressure stabilizing line 50. The intake boost line 40 may include a first conduit 41, a first regulator valve 42 disposed on the first conduit 41, and a first differential pressure flow meter 43. A first conduit 41 is connected between the first storage container 31 and the test container 20 for transporting a test medium (gas). The first regulating valve 42 is used for controlling the on-off and flow of the first pipeline 41, and is in communication connection with the control unit 10, so that the control unit 10 can control the opening and the on-off of the first regulating valve 42. By adjusting the opening degree of the first regulating valve 42, the flow rate of the test medium flowing to the test chamber 20 is controlled. A first differential pressure flow meter 43 is located on the first conduit 41 between the first regulator valve 42 and the test vessel 20 for measuring the flow of the first conduit 41 so that a flow value of the test medium to the test vessel 20 can be obtained.
The air-supplementing and pressure-stabilizing pipeline 50 is used for supplementing a large amount of air to the test container 20, meets the requirement that a large amount of exhaust air is stabilized at a certain exhaust pressure when the tested safety valve 1 is tested, and can be provided with one or more than one way. The air make-up pressure stabilization line 50 may include a second conduit 51, a second regulator valve 52 disposed on the second conduit 51, and a second differential pressure flow meter 53. A second conduit 51 is connected between the first reservoir 31 and the test vessel 20 for transporting a test medium (gas). The second regulating valve 52 is used for controlling the on-off and flow of the second pipeline 51, and is in communication connection with the control unit 10, so that the control unit 10 can control the opening and the on-off of the second regulating valve 52. By adjusting the opening degree of the second regulating valve 52, the flow rate of the test medium flowing to the test chamber 20 is controlled. A second differential pressure flow meter 53 is located on the second conduit 51 between the second regulator valve 52 and the test vessel 20 for measuring the flow rate of the second conduit 51 so that a flow rate value of the test medium flowing to the test vessel 20 can be obtained.
Depending on the flow measurement requirements, the pressure of the first storage vessel 31 is higher than the pressure of the test vessel 20, the pressure ratio of the two being preferably 3:1.
Preferably, in order to improve accuracy of flow measurement and meet type tests of safety valves with different specifications and models, the first differential pressure flowmeter 43 comprises multiple first differential pressure transmitters 431 to meet different differential pressure requirements, so that the first differential pressure flowmeter 43 can measure differential pressure signals with different sizes, and the corresponding first differential pressure transmitters 431 are adopted to accept and convert the differential pressure signals to meet the requirements of measurement accuracy. Similarly, the second differential pressure flowmeter 53 includes multiple second differential pressure transmitters 531 to meet different differential pressure requirements.
The first pressure detecting unit 61 may employ a pressure sensor.
Further, the safety valve type test automatic control system of the present invention further includes a second storage container 32, a gas supplementing line 70 connected between the second storage container 32 and the first storage container 31, and a second pressure detecting unit 62 installed on the first storage container 31 to detect a pressure change of the first storage container 31.
The second storage container 32 supplements the test medium for the first storage container 31 through the air supplementing pipeline 70, maintains the pressure of the first storage container 31 relatively stable, and is convenient for the air pressure regulation of the air supplementing and pressure stabilizing pipeline 50. The second pressure detection unit 62 and the air supplementing pipeline 70 are both in communication connection with the control unit 10, the second pressure detection unit 62 sends a detected second pressure change signal to the control unit 10, and the control unit 10 sends a corresponding instruction to control the opening and closing of the air supplementing pipeline according to the received second pressure change signal.
Specifically, the air supply line 70 may include a third pipe 71 connected between the second storage container 32 and the first storage container 31, and a third regulating valve 72 provided on the third pipe 71. The third regulating valve 72 is used for controlling the on-off and flow of the third pipeline 71, and is in communication connection with the control unit 10, so that the control unit 10 can control the opening and the on-off of the third regulating valve 72.
The second pressure detection unit 62 may be a pressure sensor.
To maintain the pressure ratio between the first storage container 31 and the test container 20, the pressure of the second storage container 32 is also higher than the pressure of the first storage container 31, and the first storage container 31 is continuously supplied with air, and the pressure ratio between the two containers is as high as possible, preferably the pressure ratio between the second storage container 32 and the first storage container 31 is equal to or less than 4.
Further, the safety valve type test automatic control system of the present invention further includes a power generator 80, a third pipe 71 connected between the power generator 80 and the second storage container 32, and a shut-off valve 82 provided on the fourth pipe 81. The power generator 80 is used to generate power to draw air for storage into the second storage container 32 as a test medium.
The automatic control system for the safety valve type test of the present invention further includes a height opening tester 90 which is connected to the tested safety valve 1 and detects the opening height of the valve stem of the tested safety valve 1. The control unit 10 is in communication connection with the on-height tester 90 and receives the on-height signal sent by the on-height tester 90.
It will be appreciated that the open height tester 90 may not be included in the system of the present invention, but need only be installed and connected for use in performing safety valve type tests.
Referring to fig. 2, the automatic control method for the safety valve pattern test for the pattern test of the safety valve using the automatic control system for the safety valve pattern test of the present invention may include the steps of:
S1, the control unit 10 sends out a command to open the air inlet boosting pipeline 40, so that the test medium of the first storage container 31 flows into the test container 20, and the boosting speed of the test container 20 is controlled to be not more than 0.01MPa/S.
S2, after the pressure of the test container 20 is increased to the set pressure, the tested safety valve 1 is opened to exhaust at the preset exhaust pressure.
The height opening tester 90 is connected to the tested safety valve 1, and is configured to detect the valve rod opening height of the tested safety valve 1, and send the detected height opening signal to the control unit 10.
S3, the control unit 10 sends out a command to open the air supplementing and stabilizing pipeline 50, so that the test medium of the first storage container 31 is supplemented to the test container 20 through the air supplementing and stabilizing pipeline 50, the relative stability of the pressure of the test container 20 is maintained, and the exhaust amount and the air inflow amount of the tested safety valve 1 are balanced.
In step S3, the control unit 10 controls the opening and closing of the air-supplementing and pressure-stabilizing pipeline 50 according to the received high-opening signal. In combination with the step S2, after receiving the high-open signal for opening the tested safety valve 1, the control unit 10 sends an opening command to open the air-supplementing and pressure-stabilizing pipeline 50 to supplement air for the test container 20.
When the exhaust gas amount and the intake air amount of the subject safety valve 1 are in balance, the pressure value detected by the first pressure detecting unit 61 is in a steady state, and the flow rates detected by the first differential pressure flow meter 43 and the second differential pressure flow meter 53 at this time are valid. When the pressure value detected by the first pressure detecting unit 61 is rising, which means that the intake air amount of the safety valve under test 1 is larger than the exhaust air amount, the control unit 10 decreases the opening of the corresponding regulating valve, specifically as follows:
1) If the pressure detected by the first pressure detecting unit 61 is less than 5% of the set pressure, the control unit 10 sends a command to turn down the opening of the first regulating valve 42, and the amplitude modulation may be 5%;
2) If the pressure detected by the first pressure detecting unit 61 is greater than the set pressure by 5% and less than 10%, the control unit 10 sends a command to turn down the opening of the second regulating valve 52, modulating the amplitude by 5%;
3) If the pressure detected by the first pressure detecting unit 61 is greater than the set pressure by 10% and less than 20%, the control unit 10 sends a command to turn down the opening of the second regulating valve 52, amplitude modulation by 10%;
4) If the pressure detected by the first pressure detecting unit 61 is greater than the set pressure by 20%, the control unit 10 sends a command to turn down the opening of the second regulating valve 52, amplitude modulation by 20%.
Conversely, when the pressure value detected by the first pressure detecting unit 61 is decreasing, indicating that the intake air amount of the safety valve under test 1 is smaller than the exhaust air amount, the control unit 10 increases the opening degree of the corresponding regulating valve, and the opening degree can be referred to in each case.
In addition, the control unit 10 sends a command to open the air supply line 70 according to the first pressure change signal (e.g. the pressure drop signal) detected by the second pressure detecting unit 62 on the first storage container 31, so that the second storage container 32 supplements air for the first storage container 31, and maintains the pressure of the first storage container 31 relatively stable.
And S4, when the pressure of the test container 20 is stabilized at the preset discharge pressure and the opening height of the valve rod of the tested safety valve 1 is stabilized at the set value, the control unit 10 acquires the pressure value detected by the first pressure detection unit 61 on the test container 20, the opening height value of the valve rod of the tested safety valve 1 and the flow value of the air inlet boost pipeline 40, and the type test of the tested safety valve 1 is completed.
The invention is further illustrated in the following test in the form of a specific safety valve. Tested safety valve model: A48Y-16C DN50 PN40, setting pressure (opening pressure) 1.0MPa, discharge pressure 1.1MPa, opening height (valve stem opening height) 12.5mm.
Before the test, calculating the theoretical displacement of the tested safety valve 1 under the discharge pressure of 1.1MPa according to the regulation of the related standard; after the theoretical displacement is obtained, the opening of the first regulating valve 42 is calculated according to the technical characteristics of the first regulating valve 42 on the air inlet boost pipeline 40, the calculated opening value is input into the control unit 10 (such as a CPU), and an index of the discharge pressure of 1.1MPa is input into the control unit 10.
In the test, the control unit 10 sends out a command to open the first regulating valve 42, the test medium flows from the first storage container 31 to the test container 20, and the pressure increasing speed of the test container 20 is controlled to be not more than 0.01MPa/s. When the pressure of the test container 20 rises to the set pressure of 1.0MPa (about), the tested safety valve 1 is opened, the height opening tester 90 detects the height opening of the valve rod of the tested safety valve 1, and transmits the detected height opening signal to the control unit 10, the control unit 10 sends out a command, and the second regulating valve 52 on the air supplementing and pressure stabilizing pipeline 50 is opened. After the second regulating valve 52 is opened, the test medium in the first storage container 31 is largely supplied to the test container 20, the pressure in the test container 20 fluctuates to a certain extent, and the control unit 10 compares the preset pressure judgment value with the pressure signal tested by the first pressure detecting unit 61, and timely adjusts the opening of the second regulating valve 52 to meet the pressure stability of the test container 20.
During the test, the first storage container 31 continuously supplements the test container 20 with gas, and the pressure of the first storage container 31 decreases. In order to ensure that the pressure of the first storage container 31 is relatively stable, when the pressure of the first storage container 31 is reduced, which is detected by the second pressure detecting unit 62, the signal is transmitted to the control unit 10, and the control unit 10 sends a command after comparing and judging, opens the third regulating valve 72 on the air supplementing pipeline 70, and supplements air to the first storage container 31 from the second storage container 32, so that the pressure of the first storage container 31 is maintained relatively stable, and the air pressure regulation of the second regulating valve 52 is facilitated.
When the pressure detected by the first pressure detecting unit 61 on the test vessel 20 is stabilized at the discharge pressure of 1.1MPa and the valve stem opening height of the safety valve 1 to be tested is stabilized at a value around 12.5mm, the control unit 10 reads the test pressure of the first pressure detecting unit 61, the opening height measured by the opening height tester 90, and the flow rates measured by the first differential pressure flow meter 43 and the second differential pressure flow meter 53 (converted by the differential pressure transmitter), and the type test of the safety valve 1 to be tested is completed.
After the test is completed, the third regulator valve 72, the second regulator valve 52, and the first regulator valve 42 are sequentially closed, and the test is ended.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. The automatic control system for the safety valve type test is characterized by comprising a control unit (10), a test container (20) for connecting a tested safety valve (1), a first storage container (31), an air inlet boosting pipeline (40), at least one air supplementing and stabilizing pipeline (50), a first pressure detection unit (61), a second storage container (32) and an air supplementing pipeline (70);
The air inlet boosting pipeline (40) is connected between the first storage container (31) and the test container (20) and is used for supplying the test medium stored in the first storage container (31) to the test container (20); the air supplementing and pressure stabilizing pipeline (50) is connected between the first storage container (31) and the test container (20) and is used for supplementing air and stabilizing pressure for the test container (20); the air supplementing pipeline (70) is connected between the second storage container (32) and the first storage container (31) to supplement test medium for the first storage container (31), and the pressure of the first storage container (31) is maintained to be relatively stable;
The first pressure detection unit (61) is mounted on the test container (20), detects a pressure change of the test container (20) and transmits a detected first pressure change signal to the control unit (10);
The air supply pressure stabilizing pipeline (50) is used for supplying a large amount of air to the test container (20) compared with the air supply pressure boosting pipeline (40); the control unit (10) is in communication connection with the air inlet pressure boosting pipeline (40), the air supplementing pressure stabilizing pipeline (50) and the first pressure detecting unit (61), controls the opening and closing of the air inlet pressure boosting pipeline (40) and controls the opening and closing of the air supplementing pressure stabilizing pipeline (50) according to the first pressure change signal;
The air inlet boosting pipeline (40) comprises a first pipeline (41) connected between the first storage container (31) and the test container (20), a first regulating valve (42) arranged on the first pipeline (41) and a first differential pressure flowmeter (43); the control unit (10) is in communication connection with the first regulating valve (42) and controls the opening and the opening of the first regulating valve (42);
the air supplementing and stabilizing pipeline (50) comprises a second pipeline (51) connected between the first storage container (31) and the test container (20), a second regulating valve (52) and a second differential pressure flowmeter (53) which are arranged on the second pipeline (51); the control unit (10) is in communication connection with the second regulating valve (52) and controls the opening and the opening of the second regulating valve (52);
The safety valve type test automatic control system further includes a second pressure detection unit (62) mounted on the first storage container (31) to detect a pressure change of the first storage container (31);
The second pressure detection unit (62) is in communication connection with the control unit (10) and sends a detected second pressure change signal to the control unit (10);
the control unit (10) is in communication connection with the air supplementing pipeline (70) and controls the opening and closing of the air supplementing pipeline (70) according to the received second pressure change signal;
The air supplementing pipeline (70) comprises a third pipeline (71) connected between the second storage container (32) and the first storage container (31), and a third regulating valve (72) arranged on the third pipeline (71);
the control unit (10) is in communication connection with the third regulating valve (72) and controls the opening and the opening of the third regulating valve (72).
2. The safety valve version test automatic control system according to claim 1, characterized in that the first differential pressure flow meter (43) comprises a plurality of first differential pressure transmitters (431);
the second differential pressure flow meter (53) includes a plurality of second differential pressure transmitters (531).
3. The safety valve type test automatic control system according to claim 1, characterized in that the pressure of the second storage container (32) is higher than the pressure of the first storage container (31), and the pressure ratio between the second storage container (32) and the first storage container (31) is equal to or less than 4.
4. The automatic safety valve pattern test control system according to claim 1, further comprising a power generator (80), a fourth pipe (81) connected between the power generator (80) and the second storage container (32), and a shut-off valve (82) provided on the fourth pipe (81).
5. The automatic safety valve type test control system according to any one of claims 1 to 4, further comprising a height opening tester (90) which is connected to the safety valve under test (1) and detects the valve stem opening height of the safety valve under test (1); the control unit (10) is in communication connection with the height opening tester (90) and receives a height opening signal sent by the height opening tester (90).
6. A safety valve pattern test automatic control method, characterized in that the safety valve pattern test automatic control system according to any one of claims 1 to 5 is employed, comprising the steps of:
s1, a control unit (10) sends out a command to open an air inlet booster pipeline (40) so that test medium of a first storage container (31) flows into a test container (20), and the booster speed of the test container (20) is controlled to be not more than 0.01MPa/S;
s2, after the pressure of the test container (20) is increased to the set pressure, the tested safety valve (1) is opened to exhaust at the preset exhaust pressure;
S3, the control unit (10) sends out a command to open a gas supplementing and pressure stabilizing pipeline (50), so that test media of the first storage container (31) are supplemented to the test container (20) through the gas supplementing and pressure stabilizing pipeline (50), the relative stability of the pressure of the test container (20) is maintained, and the exhaust amount and the air inflow of the tested safety valve (1) are balanced;
S4, when the pressure of the test container (20) is stabilized at the preset discharge pressure and the opening height of the valve rod of the tested safety valve (1) is stabilized at a set value, the control unit (10) acquires the pressure value detected by the first pressure detection unit (61) on the test container (20), the opening height value of the valve rod of the tested safety valve (1) and the flow value of the air inlet boosting pipeline (40) to complete the type test of the tested safety valve (1).
7. The automatic control method for safety valve type test according to claim 6, wherein in step S2, a height-opening tester (90) detects the valve stem opening height of the tested safety valve (1) and sends the detected height-opening signal to the control unit (10); in step S3, the control unit (10) sends a command to open the air-supplementing and pressure-stabilizing pipeline (50) according to the received high-opening signal;
in step S3, the control unit (10) sends a command to open the air supply line (70) according to the first pressure change signal detected by the second pressure detection unit (62) on the first storage container (31), so that the second storage container (32) supplements air for the first storage container (31), and the pressure of the first storage container (31) is maintained relatively stable.
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| CN109976402A (en) * | 2019-04-26 | 2019-07-05 | 太原理工大学 | A kind of pressure difference automatic control device and control method |
| CN113340586B (en) * | 2021-05-24 | 2022-12-13 | 蓝箭航天技术有限公司 | Valve low-temperature test method and measurement and control system |
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