CN114608820A - Low-temperature safety valve calibration stand - Google Patents
Low-temperature safety valve calibration stand Download PDFInfo
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- CN114608820A CN114608820A CN202210427460.7A CN202210427460A CN114608820A CN 114608820 A CN114608820 A CN 114608820A CN 202210427460 A CN202210427460 A CN 202210427460A CN 114608820 A CN114608820 A CN 114608820A
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- 238000012795 verification Methods 0.000 claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 87
- 229910052757 nitrogen Inorganic materials 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 28
- 230000000007 visual effect Effects 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 12
- 239000006200 vaporizer Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 13
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 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
- G01M13/003—Machine valves
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a low-temperature safety valve checking platform, belonging to the field of safety valve checking, the scheme can realize that after a safety valve is arranged on a clamping device in advance, the initial temperature of checking medium temperature is set to be-20 ℃ in a control system, when the expansion rate of main parts of the safety valve is relatively sensitive or the checking medium of the safety valve needs to be closer to the working temperature, lower checking medium temperature can be set according to the requirement, then the control system is operated by a display panel to check the safety valve, in the checking process, the recording system displays the pressure when the safety valve is automatically recorded, a worker can conveniently observe the change difference of the pressure value of the safety valve, when a pressure sensor and a temperature sensor find that a second checking pipe has an abnormal state, the sound-light alarm sends out a sound-light alarm to prompt the worker, after the verification is complete, the recording system will close all valves.
Description
Technical Field
The invention relates to the field of safety valve calibration, in particular to a low-temperature safety valve calibration table.
Background
The safety valve is an overpressure protection device, which is widely applied to pressure-bearing equipment such as boilers, pressure vessels, pressure pipelines and the like, in particular to pressure-bearing special equipment, and in order to ensure the intrinsic safety of the pressure-bearing special equipment, 1 or more safety valves are generally arranged at the position with the highest pressure of a pressure-bearing part, so that the safety valves are important safety accessories for ensuring the safe operation of the special equipment. The safety valve is influenced by media, operation states and the like in the using process, the discharge pressure of the safety valve can change, the safety technical specification of special equipment and corresponding laws, regulations, standards and the like provide regulations for forced check of the safety valve, for example, the safety valve on the equipment of a boiler, a pressure container or a pressure pipeline is checked every year, the existing safety valve check method and check table form are mainly provided by safety valve safety technical supervision regulations, and the standard only provides the form of a safety valve check table in a normal temperature state and a recommended low-temperature safety valve check table.
However, the low-temperature safety valve check table recommended in the safety technical specification is difficult to implement, the low-temperature working environment of the safety valve cannot be completely restored, especially in the environment with high room temperature, the check medium is extremely difficult to implement, meanwhile, the spring direct-loading safety valve for the low-temperature medium provides a simple diagram of the low-temperature safety valve check table which is basically similar to safety valve safety technical supervision regulations, supplements the check process, but does not have the problems that the low-temperature check medium is rapidly heated, and the low-temperature state cannot be maintained for a long time.
For the safety valve used for LNG, liquid nitrogen and liquid oxygen storage tanks, the main action devices of a valve body, a valve clack, a valve rod, a spring and the like of the steel or stainless steel safety valve are influenced by temperature under the low-temperature environment, the expansion coefficient of the alloy is greatly different from that of the alloy in a normal temperature environment in a low temperature environment, particularly the metal expansion rate is obviously lower than that in the normal temperature or high temperature environment in the low temperature environment, therefore, the set pressure of the safety valve verified and set under the room temperature condition is higher than the pressure which should be opened under the low-temperature environment, this causes a failure state that the safety valve should not be opened when it is opened, and is liable to cause a safety accident, for which, if the low-temperature safety valve is checked in a normal temperature environment, it is not scientific, this requires that the cryogenic safety valve be certified in a low temperature (or near operating conditions) environment, taking into account the requirements of the installation location of the cryogenic safety valve and the specifics of the operating environment.
Therefore, the invention optimizes the low-temperature source, refines the check pipeline, defines the specific parameters of each component of the check table of the low-temperature safety valve and provides a feasible scheme for reaching the constraint index provided by the safety technical specification and standard.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a low-temperature safety valve calibration console, which can realize that after a safety valve is arranged on a clamping device in advance, the initial temperature of the temperature of a calibration medium is set to be-20 ℃ in a control system, when the expansion rate of main parts of the safety valve is relatively sensitive or the calibration medium of the safety valve needs to be closer to the working temperature, the temperature of the calibration medium can be set according to the requirement, then the control system is operated through a display panel to enable the whole device to operate until the preset temperature is reached, then a valve is opened to enable nitrogen to be output so as to carry out calibration work on the safety valve, in the calibration process, the recording system automatically records the pressure when the safety valve is opened and displays the pressure, so that a worker can conveniently determine the opening pressure value of the safety valve, and when the data transmitted by two pressure sensors are inconsistent, will real-time to audible-visual annunciator signals, cause audible-visual annunciator to send audible-visual annunciator to indicate to the staff and change pressure sensor, when temperature sensor finds that the second checks the pipe and has slow temperature rise, the system will self-closing second check the pipeline, open the third low temperature medium valve of the first check pipeline of low temperature, thereby discharge low temperature nitrogen gas to the atmosphere and reach the purpose of cooling check medium, after reaching the specified temperature up to the check medium, close first check pipeline, reopen the second check pipeline, begin the check work, after the check work is accomplished, all valves will be closed to the recording system.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A low-temperature safety valve calibration stand comprises a low-temperature pressure source, a clamping device, a control system, a safety valve and a recording system, wherein the low-temperature pressure source is connected with the control system, the initial temperature of a calibration medium set in the control system is-20 ℃, the control system is connected with the clamping device, the safety valve is located on the upper side of the clamping device, and the recording system is electrically connected with the control system.
Further, the low-temperature pressure source comprises a low-temperature liquid nitrogen storage tank and a vaporizer.
Further, the chucking device includes chuck, hexagon socket head cap screw, spout, slider, stopper, promotes the piece, places platform, intake pipe, it is located the control system upside to place the platform, it is equipped with the chuck to place bench end, the hexagon socket head cap screw that is equipped with a plurality of evenly distributed is inserted to the chuck upper end, the chuck passes through hexagon socket head cap screw and places threaded connection between the platform, the spout that has three symmetric distribution is dug to the chuck upper end, it is three equal sliding connection has the slider between the spout inner wall, slider upper end fixedly connected with stopper, stopper upper end fixedly connected with promotes the piece, and is three the spout is crisscross the play each other and is equipped with, inlay establish with the chuck in and run through the chuck, chuck lower extreme fixedly connected with intake pipe, the intake pipe is connected with control system.
Further, the control system comprises a first low-temperature stop valve, a first check pipe, a second low-temperature stop valve, a third low-temperature stop valve, a fourth low-temperature stop valve, a fifth low-temperature stop valve, a pressure sensor, a temperature sensor, a communication pipe, a second check pipe and an outlet pipe, the communication pipe is installed at the upper end and the lower end of the vaporizer, the communication pipe is fixedly connected with the low-temperature liquid nitrogen storage tank, the outer end of the communication pipe is provided with the first low-temperature stop valve in an embedded mode, the upper end of the low-temperature liquid nitrogen storage tank is welded with the first check pipe, the first check pipe is connected with the air inlet pipe in a clamped mode, the outer end of the first check pipe is provided with the second low-temperature stop valve and the fourth low-temperature stop valve, the fourth low-temperature stop valve is located at the lower side of the air inlet pipe, the outer end of the first check pipe is provided with the second check pipe in an embedded mode, the upper end of the second check pipe is provided with the temperature sensor and the two pressure sensors, temperature sensor is located the pressure sensor left side, first check-up outside of tubes end inlays and is equipped with the outlet duct, the third low temperature stop valve is installed to the outlet duct outer end, the third low temperature stop valve is located second check-up pipe right side, fifth low temperature stop valve is installed to second check-up pipe outer end.
Further, record system includes display panel, equal electric connection between display panel and first low temperature stop valve, second low temperature stop valve, third low temperature stop valve, fourth low temperature stop valve, fifth low temperature stop valve and the temperature sensor, display panel is located places bench end.
Furthermore, the first checking pipe is made of a welding heat insulation pipe material, and the welding heat insulation pipe is of a vacuum sleeve structure.
Further, the equal electrically connected of pressure sensor outer end has audible-visual annunciator, electrically connected between audible-visual annunciator and the record system.
Furthermore, the two pressure sensors have the same specification, the same measuring range and the same precision grade, and the precision is 0.4 grade or more.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme utilization vaporizer changes the proportion of liquid nitrogen in the low temperature storage tank through the vaporization liquid nitrogen, and the pressure of convenient nimble regulated pressure source is corresponding to the internal pressure of increase jar, through the proportion of increasing liquid nitrogen in the storage tank, can adapt to high pressure relief valve check-up work completely.
(2) This scheme adopts the adiabatic pipe of welding to be the check-up system pipeline, and the adiabatic pipe of welding is vacuum sleeve structure, and the sleeve pipe flows including making the low temperature medium, adopts vacuum insulation between sleeve pipe and the outward appearance, and the low temperature nitrogen gas temperature rise that can realize coming out from the low temperature jar body is very little, satisfies low temperature relief valve check-up work.
(3) The scheme is beneficial to the control system and the recording system to actively monitor and adjust the temperature managed by the system, so that the checking quality of the low-temperature safety valve is ensured; and the control system records the verification process, so that the intervention of human factors on the verification process is greatly reduced, and the gross error caused by the human factors is greatly reduced, thereby properly reducing the workload of personnel.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a schematic structural diagram of a display panel according to the present invention;
fig. 3 is a schematic structural view of the chucking device of the present invention.
The reference numbers in the figures illustrate:
1 low temperature liquid nitrogen storage tank, 2 first low temperature stop valves, 3 vaporizers, 4 first check pipes, 5 second low temperature stop valves, 6 third low temperature stop valves, 7 fourth low temperature stop valves, 8 chucking device, 801 chuck, 802 hexagon socket head cap screw, 803 spout, 804 slider, 805 stopper, 806 promote the piece, 9 relief valves, 10 fifth low temperature stop valves, 11 pressure sensor, 12 temperature sensor, 13 communicating pipe, 14 place the platform, 15 second check pipes, 16 display panel, 17 intake pipe, 18 outlet duct, 19 audible-visual annunciators.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment is as follows:
referring to fig. 1-3, a low temperature safety valve calibration stand comprises a low temperature pressure source, a clamping device 8, a control system, a safety valve 9 and a recording system, wherein the low temperature pressure source is connected with the control system, the initial temperature of a calibration medium set in the control system is-20 ℃, the control system is connected with the clamping device 8, the safety valve 9 is positioned at the upper side of the clamping device 8, and the recording system is electrically connected with the control system, the scheme can realize that after the safety valve is arranged on the clamping device in advance, the initial temperature of the calibration medium is set in the control system to be-20 ℃, when the expansion rate of main parts of the safety valve is relatively sensitive or the calibration medium of the safety valve is required to be closer to the working temperature, the calibration medium temperature can be set according to the requirement, and then the control system is operated through a display panel 16 to enable the whole device to operate, until reaching the temperature that predetermines, open the valve again, thereby impel nitrogen gas to carry out the check-up work to the relief valve, and in the check-up process, recording system will the automatic recording relief valve pressure when opening, and show it, thereby be convenient for the staff to observe the difference of relief valve pressure value change this moment, and send a signal to audible and visual alarm 19 when pressure sensor 11 discovers that second check pipe 15 has slow pressure drop, cause audible and visual alarm 19 to send audible and visual alarm to indicate the staff, after the inspection work is accomplished, recording system will close all valves.
Referring to fig. 1, the cryogenic pressure source includes a cryogenic liquid nitrogen storage tank 1 and a vaporizer 3, and the pressure source is an atmospheric pressure storage tank or a conventional liquid nitrogen bottle because the specific form of the pressure source is not clear in the prior art, the pressure is mainly dependent on the natural volatilization of liquid nitrogen when the atmospheric pressure cryogenic storage tank is adopted, the highest check pressure is very low, even when the conventional liquid nitrogen bottle is adopted, the highest pressure is only 2.5MPa, according to the requirement of safety technical specification of the safety valve, the pressure source is 1.1-1.2 times higher than the check pressure, thus the highest pressure of the cryogenic safety valve which can be checked can be obtained by inverse calculation is 2.27MPa, and along with the development of energy strategy in China and the large-scale and high-parameter development of the air separation device, a large number of high-pressure safety valves are generated, so that the conventional pressure source can not complete the check work of the high-pressure safety valves, the vaporizer 3 is utilized in the present invention, through the proportion of the liquid nitrogen in the vaporization low-temperature liquid nitrogen storage tank 1, the pressure in the tank body is correspondingly increased or reduced, the pressure of the pressure source is conveniently and flexibly adjusted, and the high-pressure safety valve can be completely adapted to the checking work of the high-pressure safety valve by increasing the proportion of the liquid nitrogen in the storage tank.
Referring to fig. 1-3, the clamping device 8 includes a chuck 801, hexagon socket head cap screws 802, sliding grooves 803, sliding blocks 804, limiting blocks 805, a pushing block 806, a placing table 14, and an air inlet pipe 17, the placing table 14 is located on the upper side of the control system, the chuck 801 is disposed on the upper end of the placing table 14, a plurality of evenly distributed hexagon socket head cap screws 802 are inserted into the upper end of the chuck 801, the chuck 801 is connected with the placing table 14 through the hexagon socket head cap screws 802, three symmetrically distributed sliding grooves 803 are drilled on the upper end of the chuck 801, the sliding blocks 804 are slidably connected between the inner walls of the three sliding grooves 803, the limiting blocks 805 are fixedly connected to the upper end of the slider 804, the pushing block 806 is fixedly connected to the upper end of the limiting blocks 805, 807 are alternately arranged among the three sliding grooves 803, 807 is embedded in the chuck 801 and penetrates through the chuck 801, the air inlet pipe 17 is fixedly connected to the control system, when the safety valve 9 is installed, the accessible promotes the piece 806 that promotes three position to the outside, cause to promote piece 806 and drive slider 804 and slide in spout 803, thereby cause the diameter distance between the three stopper 805 to increase gradually, place the relief valve 9 on chuck 801 surface this moment, promote three piece 806 that promotes again afterwards, cause to promote piece 806 and drive stopper 805 and be close to the relief valve 9 this moment, cause the stopper 805 to be located the relief valve 9 upside, then at the in-process of later stage verification, nitrogen gas passes through intake pipe 17 and gets into inside 807, blow the relief valve 9 upwards, thereby cause the relief valve 9 chucking in stopper 805, accomplish the spacing to relief valve 9.
Referring to fig. 1, the control system includes a first low temperature stop valve 2, a first check pipe 4, a second low temperature stop valve 5, a third low temperature stop valve 6, a fourth low temperature stop valve 7, a fifth low temperature stop valve 10, a pressure sensor 11, a temperature sensor 12, a communicating pipe 13, a second check pipe 15 and an air outlet pipe 18, communicating pipes 13 are installed at the upper and lower ends of a vaporizer 3, the communicating pipe 13 is fixedly connected with a low temperature liquid nitrogen storage tank 1, the first low temperature stop valve 2 is installed at the outer end of the communicating pipe 13 at the lower side in an embedded manner, the first check pipe 4 is welded at the upper end of the low temperature liquid nitrogen storage tank 1, the first check pipe 4 is connected with an air inlet pipe 17 in a clamped manner, the second low temperature stop valve 5 and the fourth low temperature stop valve 7 are installed at the outer end of the first check pipe 4, the fourth low temperature stop valve 7 is located at the lower side of the air inlet pipe 17, the second check pipe 15 is installed at the outer end of the first check pipe 4, the temperature sensor 12 and the two pressure sensors 11 are installed at the upper end of the second check pipe 15, the temperature sensor 12 is positioned on the left side of the pressure sensor 11, the outer end of the first checking pipe 4 is embedded with the air outlet pipe 18, the outer end of the air outlet pipe 18 is provided with the third low-temperature stop valve 6, the third low-temperature stop valve 6 is positioned on the right side of the second checking pipe 15, the outer end of the second checking pipe 15 is provided with the fifth low-temperature stop valve 10, before checking the safety valve, a checker needs to stably install the safety valve 9 on the clamping device 8 in advance, the initial temperature of the checking medium temperature is set to-20 ℃ in a control system, when the expansion rate of main parts of the safety valve is relatively sensitive or the checking medium of the safety valve needs to be closer to the working temperature, the checking medium temperature can be set according to the requirement, then the control system is operated through the display panel 16 to firstly open the first low-temperature stop valve 2, the medium in the low-temperature liquid nitrogen storage tank 1 flows into the vaporizer 3, and the liquid nitrogen is gradually vaporized in the vaporizer 3, the vaporized nitrogen returns to the gas phase space in the low-temperature liquid nitrogen storage tank 1 through the communicating pipe 13 at the upper side, and the volume of the nitrogen is increased after the nitrogen is changed from liquid phase to gas phase, so that the pressure in the low-temperature liquid nitrogen storage tank 1 is increased, meanwhile, when two pressure sensors 11 with the same specification, the same measuring range and the same precision grade of 0.4 or more sense that the pressure at the moment is 1.5 times of the checking pressure, the first low-temperature stop valve 2 and the fourth low-temperature stop valve 7 are closed, the gas-phase nitrogen flows through the second low-temperature stop valve 5 and the third low-temperature stop valve 6 from the first checking pipe 4 made of welded heat-insulating pipe material and then is discharged into the atmosphere, the function of pre-cooling the inner wall of the first checking pipe 4 is realized, the first checking pipe 4 and the second checking pipe 15 at the moment reach the preset temperature, and the fourth low-temperature stop valve 7 is opened after the preset temperature of the temperature sensor 12 is reached, the nitrogen is output to the safety valve 9 through the air inlet pipe 17, so that the verification work is carried out, the display panel 16 automatically records the pressure when the safety valve 9 is opened during verification and displays the pressure, the temperature change presented on the surface of the display panel 16 is a curve change, the pressure change of the safety valve 9 at the moment is convenient to observe, the pressure value is the setting pressure of the safety valve, and after the verification work is finished, the recording system closes all valves.
Referring to fig. 1-2, the recording system includes a display panel 16, the display panel 16 is electrically connected to the first low-temperature stop valve 2, the second low-temperature stop valve 5, the third low-temperature stop valve 6, the fourth low-temperature stop valve 7, the fifth low-temperature stop valve 10 and the temperature sensor 12, the display panel 16 is located at the upper end of the placing table 14, and the display panel 16 can actively monitor and adjust the temperature of the system management to ensure the verification quality of the low-temperature safety valve; meanwhile, the interference of human factors to the verification process is greatly reduced due to the recording of the control system to the verification process, the gross errors caused by the human factors are greatly reduced, and the workload of personnel is properly reduced.
Referring to fig. 1, the first checking pipe 4 is made of a welded heat insulation pipe material, the welded heat insulation pipe is a vacuum sleeve structure, in the prior art, the main form of the checking pipe is that a metal hose is additionally provided with a heat insulation layer for heat preservation, so that the cold preservation level is extremely poor, the temperature rise of checking media in the pipe is rapid, when the welded heat insulation pipe is adopted as the checking pipe, the welded heat insulation pipe is the vacuum sleeve structure, low-temperature media flow in the inner sleeve, and the vacuum heat insulation is adopted between the sleeve and the appearance, so that the temperature rise of low-temperature nitrogen gas coming out of the low-temperature tank body is small, and the checking work of the low-temperature safety valve is met.
Referring to fig. 1, the outer ends of the temperature sensors 12 are electrically connected with an audible and visual alarm 19, the audible and visual alarm 19 is electrically connected with a recording system, when the temperature sensors 12 find that the temperature of the checking medium in the second checking pipe 15 is higher than the set temperature, a signal is sent to the audible and visual alarm 19, so that the audible and visual alarm 19 sends out audible and visual alarm to prompt a worker, the third low-temperature stop valve 6 is automatically opened, low-temperature nitrogen is discharged into the atmosphere, the first checking pipe 4 and the second checking pipe 15 are cooled, and after the temperature of the checking medium meets the checking requirement, the checking worker is prompted to carry out checking work.
Referring to fig. 1, the two pressure sensors 11 have the same specification, the same range and the same precision level, and the precision is 0.4 level or more, and by setting the two pressure sensors 11 having the same specification, the same range and the same precision level, and the precision is 0.4 level or more, the pressure sensors 11 can sense the pressure more precisely, reduce the error value, and read the values of the two pressure sensors at the same time, and when the deviation of the values is greater than 0.1%, the audible and visual alarm 19 sends a signal to prompt the worker to replace the pressure sensors 11.
The working principle is as follows: before the safety valve is verified, a verifier needs to push the pushing blocks 806 in three directions to the outside in advance, so that the pushing blocks 806 drive the sliding blocks 804 to slide in the sliding grooves 803, the diameter distance between the three limiting blocks 805 is gradually increased, the safety valve 9 is placed on the surface of the chuck 801 at the moment, then the three pushing blocks 806 are pushed again, so that the pushing blocks 806 drive the limiting blocks 805 to approach the safety valve 9 at the moment, so that the limiting blocks 805 are positioned on the upper side of the safety valve 9, then in the later verification process, nitrogen enters the inner part 807 through the air inlet pipe 17, the safety valve 9 is blown upwards, so that the safety valve 9 is clamped in the limiting blocks 805, the limitation on the safety valve 9 is completed, then the initial temperature of a verification medium is set to be-20 ℃ in a control system, when the expansion rate of main parts of the safety valve is relatively sensitive or when the verification medium of the safety valve needs to be closer to the working temperature, the temperature of a checking medium can be set according to the requirement, then a control system is operated through a display panel 16 to open a first low-temperature stop valve 2 firstly to enable the medium in a low-temperature liquid nitrogen storage tank 1 to flow into a vaporizer 3, liquid nitrogen is vaporized gradually in the vaporizer 3, vaporized nitrogen returns to a gas phase space in the low-temperature liquid nitrogen storage tank 1 through a communicating pipe 13 on the upper side, and the volume of the vaporized nitrogen is increased after the nitrogen is changed from a liquid phase to a gas phase, so that the pressure in the low-temperature liquid nitrogen storage tank 1 is increased, meanwhile, when two pressure sensors 11 with the same specification, the same range and the same precision grade of 0.4 or more sense that the pressure at the moment is 1.5 times of the checking pressure, the first low-temperature stop valve 2 and a fourth low-temperature stop valve 7 are closed, the gas-phase nitrogen flows through a second low-temperature stop valve 5 and a third low-temperature stop valve 6 from a first checking pipe 4 made of welded heat insulation pipe materials and then is discharged into the atmosphere, the method has the effects that the inner wall of the first check pipe 4 is precooled, the first check pipe 4 and the second check pipe 15 reach the preset temperature, the fourth low-temperature stop valve 7 is opened after the preset temperature of the temperature sensor 12 is reached, nitrogen is output to the safety valve 9 through the air inlet pipe 17 so as to carry out the check work, the pressure of the safety valve 9 during the open is automatically recorded by the display panel 16 during the check, the pressure is displayed, the temperature change on the surface of the display panel 16 is a curve change at the moment, the pressure value of the safety valve 9 is convenient to observe, the pressure value is the setting pressure of the safety valve, when the pressure sensor 11 and the temperature sensor 12 find that the second check pipe 15 is abnormal, a signal is sent to the audible and visual alarm 19, the audible and visual alarm 19 sends an audible and visual alarm to prompt a worker to replace the pressure sensor, after the check work is finished, the recording system will close all valves.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; those skilled in the art can appreciate that the present invention is not limited to the specific embodiments disclosed herein; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (8)
1. The utility model provides a low temperature relief valve check table, includes low temperature pressure source, chucking device (8), control system, relief valve (9) and record system, its characterized in that: the low-temperature pressure source is connected with a control system, the initial temperature of a calibration medium set in the control system is-20 ℃, the control system is connected with a clamping device (8), the safety valve (9) is positioned on the upper side of the clamping device (8), and the recording system is electrically connected with the control system.
2. The cryogenic safety valve verification station of claim 1, wherein: the low-temperature pressure source comprises a low-temperature liquid nitrogen storage tank (1) and a vaporizer (3).
3. The cryogenic safety valve verification station of claim 1, wherein: the clamping device (8) comprises a chuck (801), hexagon socket head bolts (802), sliding grooves (803), sliding blocks (804), limiting blocks (805), a pushing block (806), a placing table (14) and an air inlet pipe (17), wherein the placing table (14) is located on the upper side of the control system, the chuck (801) is arranged at the upper end of the placing table (14), the upper end of the chuck (801) is inserted with a plurality of uniformly distributed hexagon socket head bolts (802), the chuck (801) is in threaded connection with the placing table (14) through the hexagon socket head bolts (802), three symmetrically distributed sliding grooves (803) are drilled at the upper end of the chuck (801), the sliding blocks (804) are all in sliding connection between the inner walls of the three sliding grooves (803), the upper end of each sliding block (804) is fixedly connected with a limiting block (805), the upper end of each limiting block (805) is fixedly connected with a pushing block (806), and the three sliding grooves (803) are mutually staggered to form a sliding block (807), (807) inlay establish with chuck (801) in and run through chuck (801), chuck (801) lower extreme fixedly connected with intake pipe (17), intake pipe (17) are connected with control system.
4. The cryogenic safety valve verification station of claim 1, wherein: the control system comprises a first low-temperature stop valve (2), a first check pipe (4), a second low-temperature stop valve (5), a third low-temperature stop valve (6), a fourth low-temperature stop valve (7), a fifth low-temperature stop valve (10), a pressure sensor (11), a temperature sensor (12), a communicating pipe (13), a second check pipe (15) and an air outlet pipe (18), wherein the communicating pipe (13) is installed at the upper end and the lower end of the vaporizer (3), the communicating pipe (13) is fixedly connected with the low-temperature liquid nitrogen storage tank (1), the first low-temperature stop valve (2) is installed at the outer end of the communicating pipe (13) at the lower side in an embedded mode, the first check pipe (4) is welded at the upper end of the low-temperature liquid nitrogen storage tank (1), the first check pipe (4) is connected with the air inlet pipe (17) in a clamped mode, the second low-temperature stop valve (5) and the fourth low-temperature stop valve (7) are installed at the outer end of the first check pipe (4), fourth low temperature stop valve (7) are located intake pipe (17) downside, first check pipe (4) outer end inlays and is equipped with second check pipe (15), temperature sensor (12) and two pressure sensor (11) are installed to second check pipe (15) upper end, temperature sensor (12) are located pressure sensor (11) left side, first check pipe (4) outer end inlays and is equipped with outlet duct (18), third low temperature stop valve (6) are installed to outlet duct (18) outer end, third low temperature stop valve (6) are located second check pipe (15) right side, fifth low temperature stop valve (10) are installed to second check pipe (15) outer end.
5. A cryogenic safety valve verification station according to claims 1 and 3, wherein: the recording system comprises a display panel (16), the display panel (16) is electrically connected with a first low-temperature stop valve (2), a second low-temperature stop valve (5), a third low-temperature stop valve (6), a fourth low-temperature stop valve (7), a fifth low-temperature stop valve (10) and a temperature sensor (12), and the display panel (16) is located at the upper end of a placing table (14).
6. The cryogenic safety valve verification station of claim 4, wherein: the first checking pipe (4) is made of a welding heat insulation pipe material, and the welding heat insulation pipe is of a vacuum sleeve structure.
7. The cryogenic safety valve verification station of claim 4, wherein: the outer ends of the pressure sensor (11) and the temperature sensor (12) are electrically connected with an audible and visual alarm (19), and the audible and visual alarm (19) is electrically connected with a recording system.
8. The cryogenic safety valve verification station of claim 4, wherein: the two pressure sensors (11) have the same specification, the same measuring range and the same precision grade, and the precision is 0.4 grade or more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210427460.7A CN114608820A (en) | 2022-04-21 | 2022-04-21 | Low-temperature safety valve calibration stand |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210427460.7A CN114608820A (en) | 2022-04-21 | 2022-04-21 | Low-temperature safety valve calibration stand |
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Cited By (1)
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| CN117949205A (en) * | 2024-03-27 | 2024-04-30 | 安徽华测检测技术有限公司 | Portable safety valve calibration device |
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