CN117760659B - Safety valve sealing performance testing device and testing method - Google Patents
Safety valve sealing performance testing device and testing method Download PDFInfo
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- CN117760659B CN117760659B CN202311784477.9A CN202311784477A CN117760659B CN 117760659 B CN117760659 B CN 117760659B CN 202311784477 A CN202311784477 A CN 202311784477A CN 117760659 B CN117760659 B CN 117760659B
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- 238000007789 sealing Methods 0.000 title claims abstract description 70
- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 239000007788 liquid Substances 0.000 claims abstract description 208
- 238000011056 performance test Methods 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 241000190070 Sarracenia purpurea Species 0.000 description 4
- 238000012546 transfer Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention provides a safety valve sealing performance testing device and a testing method, comprising the following steps: the top of the pressure container is provided with a mounting port connected with the inlet of the safety valve to be tested; the pressure sensor is arranged on the pressure container and used for detecting the pressure at the inlet of the safety valve to be detected; a gas storage container for storing high-pressure gas for detection of the safety valve; one end of the first conveying pipeline is connected with the gas storage container, and the other end of the first conveying pipeline is connected with the pressure container; the first valve is arranged on the first conveying pipeline and used for controlling the opening or closing of the first conveying pipeline; the two free ends of the U-shaped pipe are respectively communicated with the first conveying pipelines at the two sides of the first valve, and a certain volume of liquid is stored in the U-shaped pipe. When the safety valve performs sealing performance test through a gas medium, the liquid level change quantity in the U-shaped pipe is converted into the leakage quantity of the safety valve, so that the air leakage quantity of the safety valve is easy to measure or observe, and the test result is more accurate.
Description
Technical Field
The invention relates to the technical field of safety valve tests, in particular to a safety valve sealing performance testing device and a safety valve sealing performance testing method.
Background
The safety valve is a main safety accessory on pressure-bearing special equipment such as a filter and a pressure container and is generally arranged on equipment of a closed system to protect the system, when the pressure in the protected equipment exceeds the design pressure, the safety valve can be automatically opened to discharge medium with excessive pressure in the equipment, so that the pressure in the equipment is reduced, the equipment is prevented from being damaged by excessive pressure, and when the pressure in the equipment is reduced to the set pressure, the safety valve can be automatically closed, so that the equipment can continuously and normally work.
In order to ensure that the safety valve can effectively work, the performance of the safety valve must be detected when the safety valve leaves a factory, and the main detection key items of the safety valve are set pressure and sealing performance.
For the detection of the sealing performance of the safety valve, in the prior art, after finishing the calibration pressure calibration of the safety valve, after determining the calibration pressure, collecting the gas discharged from the outlet of the safety valve by using a conduit and leading the gas into a water cup, and then reading the number of bubbles in the water cup in unit time to judge the sealing performance of the safety valve, as in the scheme disclosed in the patent with publication number CN213874833U, however, in the prior art, the traditional test mode is that the sealing performance of the safety valve is judged to be qualified by observing and counting through human eyes, because the artificial influence factor is larger, the counting of the bubbles is inaccurate easily, and the sealing performance of the safety valve cannot be accurately judged.
Disclosure of Invention
In view of the above, the invention provides a safety valve sealing performance testing device and a testing method, which can conveniently and reliably detect the sealing performance of a safety valve.
The technical scheme of the invention is realized as follows:
In one aspect, the present invention provides a safety valve sealing performance testing device, including:
the top of the pressure container is provided with a mounting port connected with an inlet of the safety valve to be tested;
The pressure sensor is arranged on the pressure container and used for detecting the pressure at the inlet of the safety valve to be detected;
A gas storage container for storing high-pressure gas for detection of the safety valve;
one end of the first conveying pipeline is connected with the gas storage container, and the other end of the first conveying pipeline is connected with the pressure container;
the first valve is arranged on the first conveying pipeline and used for controlling the opening or closing of the first conveying pipeline;
The two free ends of the U-shaped pipe are respectively communicated with the first conveying pipelines at the two sides of the first valve, and a certain volume of liquid is stored in the U-shaped pipe.
On the basis of the technical scheme, preferably, the U-shaped pipe comprises a first vertical pipe, a second vertical pipe and a communicating pipe communicated with the bottom ends of the first vertical pipe and the second vertical pipe, wherein the top end of the first vertical pipe is communicated with a first conveying pipeline between a first valve and a pressure container, the top end of the second vertical pipe is communicated with a first conveying pipeline between a second valve and a gas storage container, and scale marks are arranged on the side walls of the first vertical pipe and the second vertical pipe.
Further, preferably, the device further comprises a liquid storage container, a second conveying pipeline, a second valve and a receiving and measuring device, wherein one end of the second conveying pipeline is connected with the top end of the second vertical pipe, the other end of the second conveying pipeline is connected with the liquid storage container, the second valve is arranged on the second conveying pipeline, the liquid storage container stores liquid for detecting the safety valve, the liquid for testing is introduced into the safety valve to be tested through the second conveying pipeline, the U-shaped pipe and the pressure container, and the receiving and measuring device is used for being installed at the outlet of the safety valve to be tested and used for receiving and detecting media and measuring leakage quantity of the liquid media.
Still further, preferably, a booster pump is provided on the second delivery line between the second valve and the liquid storage container.
On the basis of the technical scheme, preferably, a third valve is arranged on the first conveying pipeline between the end part of the second vertical pipe and the gas storage container, a first return pipe is arranged on the communicating pipe, the tail end of the first return pipe is connected with the liquid storage container, and a fourth valve is arranged on the first return pipe.
Further, preferably, a second return pipe is arranged at the bottom of the pressure vessel, the tail end of the second return pipe is connected with a first return pipe between the liquid storage vessel and the fourth valve, a fifth valve is arranged on the second return pipe, and a sixth valve is arranged on a first conveying pipeline between the end part of the first vertical pipe and the pressure vessel.
On the basis of the technical scheme, preferably, the first return pipe is provided with a suction pump.
On the basis of the technical scheme, preferably, the receiving and measuring device comprises a receiving container and a receiving pipe, wherein the receiving container is connected with an outlet of the safety valve to be measured through the receiving pipe, a first liquid level meter is arranged on the receiving container, and a seventh valve is arranged at the bottom of the receiving container.
On the basis of the technical scheme, the device preferably further comprises a processing terminal, a second liquid level meter is arranged below the side wall of the first vertical pipe, a third liquid level meter is arranged above the side wall of the first vertical pipe, and the processing terminal is electrically connected with the first liquid level meter, the second liquid level meter and the third liquid level meter respectively.
On the other hand, the invention also discloses a safety valve performance testing method, which utilizes the safety valve performance testing device and comprises the following steps:
s1, adding a certain volume of liquid into a U-shaped pipe, and enabling the liquid level in two vertical pipes to be lower than or equal to half of the length of the vertical pipes;
s2, opening a first valve, and introducing test gas into the pressure vessel through a first conveying pipeline by the gas storage vessel;
And S3, when the pressure sensor detects that the pressure at the inlet of the safety valve is increased to 90% of the set pressure, closing the first valve, stopping ventilation, when the sealing performance of the safety valve to be detected is not tight, enabling the safety valve to leak, enabling liquid in the U-shaped pipe to move upwards along the first vertical pipe, enabling the liquid level in the first vertical pipe to be higher than the liquid level in the second vertical pipe, obtaining the difference value between the liquid levels of the first vertical pipe and the second vertical pipe, multiplying the difference value by the inner diameter of the U-shaped pipe, obtaining the leakage quantity of the safety valve under 90% of the set pressure, comparing the leakage quantity with the leakage quantity specified by the standard, and judging whether the sealing performance index of the safety valve is qualified.
Compared with the prior art, the invention has the following beneficial effects:
(1) Through setting up U type pipe on the first transfer line at the both ends of first valve to fill certain volumetric liquid at U type pipe, open first valve, pass through the gas storage container and let in the test gas to the pressure vessel through first transfer line, because the pressure of U type pipe both sides upper end is the same, high pressure gas can not make the liquid level in the U type pipe change, and the liquid level height of U type pipe both sides is unanimous this moment. When the pressure sensor detects that the pressure at the inlet of the safety valve is increased to 90% of the setting pressure, the first valve is closed, ventilation is stopped, when the sealing performance of the safety valve to be detected is not tight, the safety valve is leaked, at the moment, the gas pressure at the inlet of the first valve is larger than the gas pressure at the outlet of the first valve, the gas at the inlet of the first valve pushes the liquid in the U-shaped pipe to move towards the outlet of the first valve (the inlet of the safety valve to be detected), meanwhile, the liquid level at one side of the U-shaped pipe, which is close to the pressure container, is higher than the liquid level at the other side, the product of the liquid level increase difference value at the two sides of the inner side of the U-shaped pipe and the inner diameter of the U-shaped pipe is the leakage of the safety valve at 90% of the setting pressure, whether the sealing performance index of the safety valve is qualified or not can be judged through comparing the acquired leakage data with the leakage specified by standards, and the whole sealing performance testing device of the safety valve can be used for converting the liquid level change quantity in the U-shaped pipe into the leakage quantity of the safety valve, so that the leakage gas quantity of the safety valve is easy to measure or observe, and the testing result is more accurate;
(2) The measurement of the leakage quantity of the gas medium of the safety valve is transferred from the discharge port of the safety valve to the upstream of the inlet of the safety valve, so that the test of the setting pressure and the sealing performance can be completed at one time, and a special sealing performance testing instrument is not required to be installed after the setting pressure is checked;
(3) The second conveying pipeline is connected to the U-shaped pipe, and the liquid storage container is connected to the second conveying pipeline, so that certain liquid can be introduced into the U-shaped pipe on one hand, the safety valve can conveniently conduct sealing performance test by using a gas medium, and on the other hand, the second conveying pipeline is connected with the U-shaped pipe in series, so that the safety valve can conveniently conduct sealing performance test by using a liquid medium, and the whole testing device can conduct sealing performance test on the safety valve under the gas and liquid double-medium test condition;
(4) The first loop is arranged between the U-shaped pipe and the liquid storage container, the fourth valve is arranged on the first loop, and part of liquid in the U-shaped pipe flows into the liquid storage container through the first return pipe under the action of gravity by opening the fourth valve, so that the condition that part of space in the U-shaped pipe is not filled with liquid is satisfied, and the leakage of the safety valve in the gas medium environment can be measured intuitively through the liquid level height difference in the U-shaped pipe when the sealing performance of the safety valve by using the gas medium next time is tested;
(5) Through setting up respectively with the second liquid level meter and the third liquid level meter of processing terminal electric connection about first standpipe, under initial condition, after the liquid level of U type intraductal lets in is detected by the second liquid level meter, then stop letting in liquid to U type intraductal, when utilizing gaseous medium to carry out sealing performance test to the relief valve, when the relief valve has gaseous medium to leak, liquid in the U type intraductal can be moved to the relief valve export direction that awaits measuring, the liquid level in the first standpipe risees this moment, the liquid level value that obtains through the liquid level value that the third liquid level meter subtracted the liquid level value that the second liquid level meter obtained, then be the intraductal liquid level rise value of U type, processing terminal has preset the internal diameter data of U type pipe, can calculate the leakage quantity of gaseous medium automatically, according to the leakage quantity data that obtains with standard prescribed leakage quantity contrast, can judge whether the relief valve sealing performance index is qualified, whole easy operation is convenient, the maneuverability is strong.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic plan view of a safety valve performance test device according to the present invention;
Reference numerals:
1. A pressure vessel; s, a safety valve to be tested; 2. a pressure sensor; 3. a gas storage container; 4. a first delivery line; 6. a first valve; 5. a U-shaped tube; 51. a first standpipe; 52. a second standpipe; 53. a communicating pipe; l and scale marks; 7. a liquid storage container; 8. a second delivery line; 9. a second valve; 10. receiving a measuring device; 11. a booster pump; 12. a third valve; 13. a first return pipe; 14. a fourth valve; 15. a second return pipe; 16. a fifth valve; 17. a sixth valve; 18. a suction pump; 101. a receiving container; 102. a receiving tube; p1, a first liquid level meter; 1011. a seventh valve; p2, a second liquid level meter; and P3, a third liquid level meter.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
As shown in fig. 1, the embodiment of the invention discloses a safety valve sealing performance testing device, which comprises a pressure container 1, a pressure sensor 2, a gas storage container 3 and a first conveying pipeline 4.
The pressure container 1 is used for being connected with the safety valve S to be tested, so that a test medium is introduced into the safety valve S to be tested through the pressure container 1, the pressure container 1 in the embodiment can be a container such as a box body or a tank body, the top of the pressure container 1 is provided with a mounting port connected with an inlet of the safety valve S to be tested, and when the safety valve is subjected to tightness test, the safety valve is placed at the top of the pressure container 1, and the inlet of the safety valve S to be tested is in sealing connection with the mounting port.
The gas storage container 3 is used for storing high-pressure gas for detecting a safety valve, in some embodiments, the stored gas may be air, and of course, the stored gas may also be nitrogen, and in this embodiment, the gas storage container 3 is a high-pressure storage tank.
The first delivery line 4 has one end connected to the gas storage vessel 3 and the other end connected to the pressure vessel 1, and the gas storage vessel 3 is capable of introducing high-pressure gas into the pressure vessel 1 through the first delivery line 4.
And the pressure sensor 2 is arranged on the pressure container 1 and is used for detecting the pressure at the inlet of the safety valve S to be detected.
In this embodiment, the high-pressure gas is continuously introduced into the safety valve inlet through the first delivery pipe 4 and the pressure vessel 1 by the gas storage vessel 3, and meanwhile, the pressure at the safety valve inlet is detected according to the pressure sensor 2, and in the normal case, when the sealing performance of the safety valve is detected, it is required to detect whether the leakage exists at the sealing surface of the safety valve when the pressure of the medium at the safety valve inlet reaches 90% of the set pressure.
In the prior art, aiming at the tightness detection of a gas medium, the gas exhausted from the outlet of a safety valve is usually collected by a guide pipe and led into a water cup, then the number of bubbles in unit time in the water cup is read to judge the tightness of the safety valve, and the existing test mode is to observe and count through human eyes, so that the bubbles are easily inaccurate in count due to large artificial influence factors, and whether the tightness of the safety valve is qualified cannot be accurately judged.
In order to solve the problems, the invention is technically improved on the basis of the safety valve sealing performance testing device according to the embodiment, so as to conveniently and reliably detect the sealing performance of the safety valve.
Specifically, the safety valve sealing performance testing device disclosed in this embodiment further includes a U-shaped pipe 5 and a first valve 6, where the first valve 6 is disposed on the first conveying pipeline 4 and is used to control opening or closing of the first conveying pipeline 4; the first valve 6 is preferably a stop valve, and can be a mechanical or electric control type U-shaped pipe 5, two free ends of the U-shaped pipe 5 are respectively communicated with the first conveying pipelines 4 at two sides of the first valve 6, and a certain volume of liquid is stored in the U-shaped pipe 5.
By adopting the scheme, under the initial state, the liquid stored in the U-shaped pipe 5 can not fully fill the inside of the U-shaped pipe 5, the liquid level in the two vertical pipes is kept to be lower than or equal to half of the length of the vertical pipes, the upper parts of the vertical pipes are made to be hollow, the first valve 6 is opened, test gas is introduced into the pressure vessel 1 through the gas storage vessel 3 via the first conveying pipeline 4, and the liquid level in the U-shaped pipe 5 can not be changed due to the fact that the pressure at the upper ends of the two sides of the U-shaped pipe 5 is the same, and the liquid level at the two sides of the U-shaped pipe 5 is consistent at the moment. When the pressure sensor 2 detects that the pressure of the inlet of the safety valve is increased to 90% of the setting pressure, the first valve 6 is closed, ventilation is stopped, when the sealing performance of the safety valve S to be detected is not tight, the safety valve leaks, at this time, the gas pressure of the inlet of the first valve 6 is larger than the gas pressure of the outlet of the first valve 6, the gas at the inlet of the first valve 6 pushes the liquid in the U-shaped pipe 5 to move towards the outlet of the first valve 6 (the inlet of the safety valve S to be detected), meanwhile, the liquid level of one side, which is close to the pressure container 1, of the U-shaped pipe 5 is higher than the liquid level of the other side, the product of the liquid level increase difference value of the two sides inside the U-shaped pipe 5 and the inner diameter of the U-shaped pipe is the leakage quantity of the safety valve under 90% of the setting pressure, and whether the sealing performance index of the safety valve is qualified can be judged through comparison of the acquired leakage quantity data and the leakage quantity specified by standards.
In this embodiment, the U-shaped pipe 5 includes a first standpipe 51, a second standpipe 52, and a communicating pipe 53 connected to bottom ends of the first standpipe 51 and the second standpipe 52, wherein a top end of the first standpipe 51 is connected to the first conveying pipeline 4 between the first valve 6 and the pressure vessel 1, a top end of the second standpipe 52 is connected to the first conveying pipeline 4 between the second valve 9 and the gas storage vessel 3, and scale marks L are provided on sidewalls of the first standpipe 51 and the second standpipe 52.
In the above embodiment, the top ends of the first standpipe 51 and the second standpipe 52 are respectively connected to the first conveying pipes 4 on both sides of the first valve 6 through three-way connectors. In some embodiments, by providing the scale marks L on the sidewalls of the first standpipe 51 and the second standpipe 52, the amount of change in the liquid level in the first standpipe 51 and the second standpipe 52 can be intuitively obtained.
It should be noted that when the pressure of the gas medium in the first delivery pipe reaches 90% of the setting pressure of the relief valve, for a certain period of time, for example, 2-5S later, the difference between the liquid levels in the first standpipe 51 and the second standpipe 52 is observed, and then multiplied by the inside diameter data of the U-shaped pipe, so that the leakage amount of the relief valve at 90% of the setting pressure can be accurately obtained.
Before the above-described tightness test, the first valve 6 is opened, the high-pressure gas is continuously introduced into the pressure vessel 1 by the gas storage vessel 3, and the reference number of the pressure sensor 2 is used to verify the set pressure of the relief valve. After the calibration of the setting pressure of the safety valve is completed, the tightness of the safety valve can be tested immediately, a special sealing performance testing instrument is not required to be installed after the calibration of the setting pressure, and the air leakage of the safety valve is easier to measure or observe by utilizing the water level change in the U-shaped pipe 5, so that the calibration is more accurate and reliable.
In the above embodiment, the medium used for the tightness test of the safety valve is a gas, and since the safety valve has a liquid medium in addition to a gas medium in the actual use process, the safety valve needs to be subjected to the tightness test by using the liquid medium in the tightness test of the safety valve.
In the prior art, most of test devices designed for the sealing performance of the safety valve are tested for a single medium, and cannot be applied to gas and liquid double-medium tests, and the sealing performance of the safety valve cannot be tested under the gas and liquid double-medium test conditions.
For this purpose, the safety valve sealing performance testing device of the present invention further comprises a liquid storage container 7, a second delivery pipe 8, a second valve 9, and a receiving and measuring device 10.
Wherein, one end of the second conveying pipeline 8 is connected with the top end of the second standpipe 52, preferably, the second conveying pipeline 8, the second standpipe 52 and the first conveying pipeline 4 are connected through a four-way joint, the other end of the second conveying pipeline 8 is connected with the liquid storage container 7, the second valve 9 is arranged on the second conveying pipeline 8 and used for controlling the opening and closing of the second conveying pipeline 8, the liquid storage container 7 stores a safety valve detection liquid, and is used for introducing a test liquid into the safety valve S to be tested through the second conveying pipeline 8, the U-shaped pipe 5 and the pressure container 1, preferably, the liquid storage container 7 is a high-pressure water tank, and the test liquid is purified water or water with color. The reception measuring device 10 is used for being installed at the outlet of the safety valve S to be measured, for receiving the medium for detection and measuring the leakage amount of the liquid medium.
By adopting the technical scheme, when the working condition of the safety valve S to be tested is a gas medium, the first valve 6 is closed, the second valve 9 is opened, certain test liquid is introduced into the U-shaped pipe 5 through the second conveying pipeline 8 by the liquid storage container 7, so that the liquid stored in the U-shaped pipe 5 is not fully filled in the U-shaped pipe 5, the liquid level in the two vertical pipes is kept to be lower than or equal to half of the length of the vertical pipes, and the upper parts of the vertical pipes are hollow. At this time, the second valve 9 is closed, the first valve 6 is opened, gas is continuously introduced into the inlet of the safety valve S to be tested through the gas storage container 3, and the setting pressure of the safety valve is checked through the indication of the pressure sensor 2. After the calibration of the setting pressure of the safety valve is completed, the tightness of the gas medium of the safety valve can be tested immediately by utilizing the water level change in the U-shaped pipe 5.
When the working condition of the safety valve S to be tested is liquid medium, the first valve 6 is closed, the second valve 9 is opened, liquid is continuously introduced into the inlet of the safety valve S to be tested through the second conveying pipeline 8, the U-shaped pipe 5 and the pressure container 1 by the liquid storage container 7, and the pressure is continuously increased, and the setting pressure of the safety valve under the liquid medium can be verified by the indication of the pressure sensor 2. After the safety valve liquid medium setting pressure test is completed, the pressure in the pipeline is adjusted to 90% of the safety valve setting pressure, at this time, when the sealing performance of the safety valve S to be tested is not tight, the safety valve leaks liquid medium, and the liquid medium is discharged from the outlet of the safety valve S to be tested and is received by the receiving and measuring device 10, so that the leakage amount of the liquid medium is measured.
In some embodiments, when the test medium in the pipeline is liquid, in order to continuously pressurize, the second conveying pipeline 8 between the second valve 9 and the liquid storage container 7 is provided with the booster pump 11, and when the pipeline is filled with the liquid medium, the booster pump 11 can continuously pressurize the liquid medium in the pipeline, so that the liquid medium can meet the set pressure of the safety valve and the test condition of sealing performance after being pressurized in the pipeline.
In the embodiment of the invention, the third valve 12 is arranged on the first conveying pipeline 4 between the end part of the second vertical pipe 52 and the gas storage container 3, the opening or closing of the gas storage container 3 can be controlled through the third valve 12, meanwhile, when the tightness of the safety valve is tested by using a gas medium, partial liquid in the second conveying pipeline 8 can be prevented from entering the first conveying pipeline 4 when the liquid in the second conveying pipeline 8 is introduced into the U-shaped pipe 5, and when the first conveying pipeline 4 and the U-shaped pipe 5 establish a passage, the liquid in the first conveying pipeline 4 close to one side of the gas medium can enter the U-shaped pipe 5, so that the liquid level in the U-shaped pipe 5 is changed, and the determination of the liquid level reference position is inconvenient. In the above embodiment, the third valve 12 is disposed at the end of the first delivery pipe 4 near the second standpipe 52, so that when the third valve 12 is closed, the liquid does not flow back to the portion of the first delivery pipe 4 where the gas storage container 3 is located when the liquid is introduced.
In some embodiments, after the safety valve sealing performance testing device disclosed by the invention is used for testing the sealing performance of the safety valve by using a gas medium or a liquid medium, because the U-shaped pipe 5 is filled with liquid, when the safety valve needs to be tested by using the gas medium, the liquid level difference cannot be intuitively obtained when the liquid level in the U-shaped pipe 5 changes, therefore, the scheme adopted by the invention is that the first return pipe 13 is arranged on the communicating pipe 53, the tail end of the first return pipe 13 is connected with the liquid storage container 7, and the fourth valve 14 is arranged on the first return pipe 13. By adopting the technical scheme, partial liquid in the U-shaped pipe 5 can flow into the liquid storage container 7 through the first return pipe 13 under the action of gravity by opening the fourth valve 14, so that the condition that partial space in the U-shaped pipe 5 is not filled with liquid is satisfied, and therefore, the leakage of the safety valve in the gas medium environment can be conveniently measured by utilizing the liquid level difference in the U-shaped pipe 5 next time when the gas medium is used for testing the sealing performance of the safety valve.
Since the pressure vessel 1 is also filled with liquid when the sealing performance of the safety valve is tested by using the liquid medium, in order to meet the requirement of the next test of the gas medium on the performance of the safety valve, the liquid in the pressure vessel 1 needs to be emptied, and for this purpose, the invention is provided with the second return pipe 15 at the bottom of the pressure vessel 1, the tail end of the second return pipe 15 is connected with the first return pipe 13 between the liquid storage vessel 7 and the fourth valve 14, and the fifth valve 16 is arranged on the second return pipe 15.
Since the first standpipe 51 of the U-shaped pipe 5 is connected to the pressure vessel 1 via the first transfer line 4, when the liquid in the U-shaped pipe 5 is discharged, the liquid in the pressure vessel 1 flows back to the U-shaped pipe 5, so that the liquid level in the U-shaped pipe 5 can be lowered only by the long time of discharging the liquid in the U-shaped pipe 5, but the liquid in the pressure vessel 1 cannot be completely discharged at this time, and the liquid in the pressure vessel 1 still needs to be further discharged, which is troublesome to operate.
In the above-described embodiment, the liquid in the U-shaped pipe 5 and the pressure vessel 1 is not easily discharged due to a certain pressure in the pipe, and for this purpose, the invention provides a suction pump 18 in the first return pipe 13. By adopting the technical scheme, in the actual use process, the fifth valve 16, the sixth valve 17 and the second valve 9 are closed at first, the fourth valve 14 is opened, a part of liquid in the U-shaped pipe 5 can be discharged through the suction pump 18, when the liquid level in the U-shaped pipe 5 is discharged to meet the requirement, the fourth valve 14 is closed, the fifth valve 16 is opened, the liquid in the pressure vessel 1 is emptied through the suction pump 18, the discharged liquid completely flows into the liquid storage vessel 7, and the excessive consumption of the test liquid in the liquid storage vessel 7 is avoided.
In some preferred embodiments, the receiving and measuring device 10 includes a receiving container 101 and a receiving tube 102, the receiving container 101 is connected to an outlet of the safety valve S to be measured through the receiving tube 102, a first level gauge P1 is disposed on the receiving container 101, and a seventh valve 1011 is disposed at the bottom of the receiving container 101. By adopting the above technical scheme, when the sealing performance of the safety valve is tested through the liquid medium, the liquid leaking and discharging from the safety valve can be received through the receiving container 101, and the volume of the liquid can be obtained through the first liquid level meter P1, so that the leakage amount of the liquid medium can be indirectly obtained. After the new sealing test of the safety valve is completed, the liquid can be discharged through the seventh valve 1011.
In order to obtain the sealing performance of the safety valve more intuitively, the invention further comprises a processing terminal, a second liquid level meter P2 is arranged below the side wall of the first vertical pipe 51, a third liquid level meter P3 is arranged above the side wall of the first vertical pipe 51, and the processing terminal is respectively and electrically connected with the first liquid level meter P1, the second liquid level meter P2 and the third liquid level meter P3. By adopting the technical scheme, after the liquid level introduced into the U-shaped pipe 5 is detected by the second liquid level meter P2 in the initial state, the introduction of liquid into the U-shaped pipe 5 is stopped, when the gas medium is used for sealing performance test of the safety valve, when the safety valve is leaked, the liquid in the U-shaped pipe 5 moves towards the outlet direction of the safety valve S to be tested, at the moment, the liquid level in the first vertical pipe 51 rises, the liquid level value obtained by subtracting the liquid level value obtained by the second liquid level meter P2 from the liquid level value obtained by the third liquid level meter P3 is the liquid level rising value in the U-shaped pipe 5, the inner diameter data of the U-shaped pipe 5 is preset by the processing terminal, the leakage amount of the gas medium is automatically calculated, and whether the sealing performance index of the safety valve is qualified can be judged by comparing the obtained leakage amount data with the leakage amount specified by the standard.
It should be noted that the position of the second level gauge P2 is about 1/2 of the height of the first standpipe 51, and the leakage amount of the gas medium in the case of poor tightness of the safety valve can be accurately obtained through the difference of the liquid levels in the first standpipe 51 because the leakage amount of the gas medium is not very large.
The corresponding leakage amount of the liquid medium can be directly obtained through the first liquid level meter P1 and recorded by the processing terminal.
As some preferred embodiments, the processing terminal may be electrically connected to each valve and electrical element in this embodiment, and the processing terminal is used to operate, so that the operability is stronger.
The invention also discloses a safety valve performance testing method, which utilizes the safety valve performance testing device and comprises the following steps:
S1, adding a certain volume of liquid into a U-shaped pipe 5, and enabling the liquid level in two vertical pipes to be lower than or equal to half of the length of the vertical pipes;
S2, opening a first valve 6, and introducing test gas into the pressure vessel 1 through the gas storage vessel 3 via the first conveying pipeline 4;
And S3, when the pressure sensor 2 detects that the pressure at the inlet of the safety valve is increased to 90% of the setting pressure, the first valve 6 is closed, ventilation is stopped, when the sealing performance of the safety valve S to be detected is not tight, the safety valve leaks, the liquid in the U-shaped pipe 5 moves upwards along the first vertical pipe 51, the liquid level in the first vertical pipe 51 is higher than the liquid level in the second vertical pipe 52, the leakage of the safety valve under 90% of the setting pressure is obtained by acquiring the difference value between the liquid levels of the first vertical pipe 51 and the second vertical pipe 52 and multiplying the difference value by the inner diameter of the U-shaped pipe, and the leakage is compared with the leakage specified by the standard, so that whether the sealing performance index of the safety valve is qualified is judged.
In the above step S1, there are two ways of adding a certain liquid to the U-shaped tube 5.
When the test device of the present invention can test the sealing performance of the safety valve only by a gaseous medium, it is possible to store a certain liquid in the U-shaped tube 5 in advance and then connect the U-shaped tube 5 and the first delivery pipe 4.
When the testing device provided by the invention can pass through a gas medium and can also pass through a liquid medium to test the sealing performance of the safety valve, the method for adding liquid into the U-shaped pipe comprises the following steps: first, the first valve 6 is closed, the second valve 9 is opened, a certain amount of liquid for testing is introduced into the U-shaped pipe 5 through the second conveying pipeline 8 by the liquid storage container 7, so that the liquid stored in the U-shaped pipe 5 is not fully filled in the U-shaped pipe 5, the liquid level in the two vertical pipes is kept to be lower than or equal to half of the length of the vertical pipes, and the upper parts of the vertical pipes are hollow.
The test methods of S1-S3 are aimed at the sealing performance test of the safety valve by utilizing a gas medium.
The method for testing the sealing performance of the safety valve by using the liquid medium is as follows:
First, the first valve 6 is closed, the second valve 9 is opened, liquid is continuously introduced into the inlet of the safety valve S to be tested through the liquid storage container 7, the second conveying pipeline 8, the U-shaped pipe 5 and the pressure container 1, the pressure is continuously pressurized, and the setting pressure of the safety valve under the liquid medium can be verified through the indication of the pressure sensor 2.
Secondly, after the safety valve liquid medium setting pressure test is completed, the pressure in the pipeline is adjusted to 90% of the safety valve setting pressure, at this time, when the sealing performance of the safety valve S to be tested is not tight, the safety valve leaks liquid medium, the liquid medium is discharged from the outlet of the safety valve S to be tested and is received by the receiving and measuring device 10, and thus the leakage amount of the liquid medium is measured.
In the above embodiment, if the sealing performance of the safety valve is tested by the gas medium, the safety valve may be tested by directly reusing the liquid medium.
After the sealing performance of the safety valve is tested through the liquid medium, if the sealing performance of the safety valve is required to be tested through the gas medium, the specific operation steps are as follows:
First, the fourth valve 14 is opened, and a part of the liquid in the U-shaped pipe is flowed into the liquid storage container 7 through the first return pipe 13, so that a part of the cavity exists at the upper end of the U-shaped pipe.
Next, the fourth valve 14 is closed, the fifth valve 16 is opened, and the liquid in the pressure vessel 1 is converged into the first return pipe 13 through the second return pipe 15, and enters the liquid storage vessel 7, and the liquid in the pressure vessel 1 is emptied.
And then the step operation of S2-S3 is carried out, so that the sealing performance test of the gas medium on the safety valve is completed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A safety valve sealing performance testing device, comprising:
The pressure vessel (1), the top of the pressure vessel (1) is provided with a mounting port connected with the inlet of the safety valve (S) to be tested;
the pressure sensor (2) is arranged on the pressure container (1) and is used for detecting the pressure at the inlet of the safety valve (S) to be detected;
a gas storage container (3) for storing high-pressure gas for detection of the safety valve;
a first delivery line (4) having one end connected to the gas storage vessel (3) and the other end connected to the pressure vessel (1);
The first valve (6) is arranged on the first conveying pipeline (4) and is used for controlling the opening or closing of the first conveying pipeline (4);
the two free ends of the U-shaped pipe (5) are respectively communicated with the first conveying pipelines (4) at the two sides of the first valve (6), and a certain volume of liquid is stored in the U-shaped pipe (5);
The U-shaped pipe (5) comprises a first vertical pipe (51), a second vertical pipe (52) and a communicating pipe (53) communicated with the bottom ends of the first vertical pipe (51) and the second vertical pipe (52), the top end of the first vertical pipe (51) is communicated with a first conveying pipeline (4) between a first valve (6) and the pressure vessel (1), the top end of the second vertical pipe (52) is communicated with a first conveying pipeline (4) between a second valve (9) and the gas storage vessel (3), and scale marks (L) are arranged on the side walls of the first vertical pipe (51) and the second vertical pipe (52); the device comprises a first vertical pipe (52), a first conveying pipe (8), a second vertical pipe (52), a liquid storage container (7), a first valve (9) and a receiving and measuring device (10), wherein one end of the first conveying pipe (8) is connected with the top end of the first vertical pipe, the other end of the first conveying pipe (8) is connected with the first conveying pipe (8), the first valve (9) is arranged on the first conveying pipe (8), the liquid storage container (7) stores liquid for detecting a safety valve, the liquid is used for introducing the liquid for testing into a safety valve (S) to be tested through the first conveying pipe (8), the U-shaped pipe (5) and the pressure container (1), and the receiving and measuring device (10) is used for being arranged at the outlet of the safety valve (S) to be tested and used for receiving and measuring leakage quantity of the liquid medium;
a third valve (12) is arranged between the end part of the second vertical pipe (52) and the gas storage container (3), a first return pipe (13) is arranged on the communicating pipe (53), the tail end of the first return pipe (13) is connected with the liquid storage container (7), and a fourth valve (14) is arranged on the first return pipe (13);
The bottom of the pressure vessel (1) is provided with a second return pipe (15), the tail end of the second return pipe (15) is connected with a first return pipe (13) between the liquid storage vessel (7) and a fourth valve (14), the second return pipe (15) is provided with a fifth valve (16), and a sixth valve (17) is arranged on a first conveying pipeline (4) between the end of the first vertical pipe (51) and the pressure vessel (1);
The first return pipe (13) is provided with a suction pump (18).
2. The safety valve sealing performance test device according to claim 1, wherein: a booster pump (11) is arranged on the second conveying pipeline (8) between the second valve (9) and the liquid storage container (7).
3. The safety valve sealing performance test device according to claim 1, wherein: the receiving and measuring device (10) comprises a receiving container (101) and a receiving pipe (102), wherein the receiving container (101) is connected with an outlet of a safety valve (S) to be measured through the receiving pipe (102), a first liquid level meter (P1) is arranged on the receiving container (101), and a seventh valve (1011) is arranged at the bottom of the receiving container (101).
4. The safety valve sealing performance test device according to claim 1, wherein: the device is characterized by further comprising a processing terminal, a second liquid level meter (P2) is arranged below the side wall of the first vertical pipe (51), a third liquid level meter (P3) is arranged above the side wall of the first vertical pipe (51), and the processing terminal is electrically connected with the first liquid level meter (P1), the second liquid level meter (P2) and the third liquid level meter (P3) respectively.
5. A safety valve sealing performance testing method using the safety valve sealing performance testing apparatus according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
s1, adding a certain volume of liquid into a U-shaped pipe (5), and enabling the liquid level in two vertical pipes to be lower than or equal to half of the length of the vertical pipes;
s2, opening a first valve (6), and introducing test gas into the pressure vessel (1) through the gas storage vessel (3) through the first conveying pipeline (4);
s3, when the pressure sensor (2) detects that the pressure at the inlet of the safety valve is increased to 90% of the set pressure, the first valve (6) is closed, ventilation is stopped, when the sealing performance of the safety valve (S) to be detected is not tight, the safety valve leaks, liquid in the U-shaped pipe (5) moves upwards along the first vertical pipe (51), the liquid level in the first vertical pipe (51) is higher than the liquid level in the second vertical pipe (52), the leakage of the safety valve under 90% of the set pressure is obtained by acquiring the difference value between the liquid levels of the first vertical pipe (51) and the second vertical pipe (52) and multiplying the difference value by the inner diameter of the U-shaped pipe, and the leakage is compared with the leakage specified by the standard, so that whether the sealing performance index of the safety valve is qualified is judged.
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| CN108827561A (en) * | 2018-08-03 | 2018-11-16 | 深圳市特种设备安全检验研究院 | Safety valve testing equipment |
| CN214200535U (en) * | 2020-12-23 | 2021-09-14 | 盐城市质量技术监督综合检验检测中心 | Valve leakage test system |
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| KR102198689B1 (en) * | 2019-03-27 | 2021-01-05 | (주)다흥 | Performance test measurement equipment for safety valve |
| CN112304533A (en) * | 2019-07-26 | 2021-02-02 | 中核苏阀科技实业股份有限公司 | Valve sealing surface leakage inspection device and method |
| CN112432744B (en) * | 2020-11-10 | 2023-03-21 | 中广核工程有限公司 | Nuclear island water system sealing measurement device and measurement method |
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| CN108827561A (en) * | 2018-08-03 | 2018-11-16 | 深圳市特种设备安全检验研究院 | Safety valve testing equipment |
| CN214200535U (en) * | 2020-12-23 | 2021-09-14 | 盐城市质量技术监督综合检验检测中心 | Valve leakage test system |
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