CN217901138U - Device for detecting leakage rate of bolt flange connection system under simulation of multiple working conditions - Google Patents
Device for detecting leakage rate of bolt flange connection system under simulation of multiple working conditions Download PDFInfo
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Abstract
The utility model discloses a bolt flange connected system leakage rate detection device under simulation multiplex condition, the device include that medium feed system, medium sealing system, leakage rate detecting system, load apply system, heating temperature regulating system and data acquisition analytic system. The utility model discloses a vacuum heat insulation seal structure has formed the collection that has good sealing performance and has leaked the cavity. The load applying system adopts an electro-hydraulic servo actuator and a load applying arm to apply vibration and bending moment to the bolt flange connecting system. The utility model discloses can simulate multiple operating condition, adopt the mode of collecting the leakage medium to measure the leakage rate of bolt flange joint system under the condition such as receiving temperature fluctuation, medium pressure fluctuation, moment of flexure and mechanical vibration, it is higher than the pressure drop method measurement accuracy commonly used. The device is used for measuring the leakage rate of the bolted flange connection system, monitoring the stress condition of the bolts and evaluating the sealing performance, so that the service life of the bolted flange connection system can be predicted, and the safety of the bolted flange connection system is ensured.
Description
Technical Field
The utility model provides a bolt flange connected system leakage rate detection device under simulation multiplex condition, this detection device and detection method are applicable to the bolt flange connected system and receive temperature fluctuation, medium pressure fluctuation and apply the leakage rate detection under the condition of external bending moment and mechanical vibration, can be used to the sealing performance aassessment to bolt flange connected system to predict its life-span.
Background
The bolt flange connection is a common connection mode in equipment and pipelines, and is widely applied to industries such as petrifaction, chemical engineering, nuclear power, metallurgy, pharmacy and the like because of the advantages of easy disassembly and installation. In production and construction, the flange is influenced by external environment and the like, and the temperature and the medium pressure fluctuate, so that the flange can be subjected to changes such as deflection, warping, creep deformation, crack propagation and the like, and the stress change of each part of the flange is complex; when the flange has the effect of an external bending moment or has the influence of vibration, the stress characteristics of all parts of the flange also change greatly, and deflection, warping and cracks can intensify leakage. The flange device can also generate the phenomena of bolt loosening, fatigue, stress relaxation and the like, and can bring potential safety hazards to the normal operation of equipment. According to statistics, the leakage of the bolted flange connection system is one of the main reasons for major accidents of enterprises such as petrochemical engineering and the like. Therefore, the research on the influence of temperature and medium pressure fluctuation and applied external bending moment and mechanical vibration on the tightness of the bolt flange connecting system is a problem to be solved urgently in the current engineering practice.
From the development conditions at home and abroad, the tightness research of the bolt flange connection system in the environment of bending moment and vibration only stays in the mechanical analysis of the bolt flange failure under the action of static load, and the tightness of the flange is improved by changing the machining process and the material performance of the flange and a gasket. At present, theoretical analysis of the failure and leakage of the bolt flange connecting system under the action of the bending moment and the vibration load is not mature. Although foreign people carry out the experiment of loosening and retreating a single bolt under the action of vibration, no related patent carries out detailed analysis on the failure of the bolt flange connecting system under the action of vibration, so that the time standard of the failure of the bolt flange connecting system under the action of external bending moment and the action of vibration cannot be given.
At present, under the action of fluctuation of temperature and medium pressure, external bending moment and mechanical vibration, a method for measuring the leakage rate of the bolted flange connection system has no corresponding standard, and in actual production, the occurrence time of leakage of the bolted flange connection system caused by external load and the size of the leakage rate are unclear. In view of the above practical problems, the existing detection device is improved.
Disclosure of Invention
The utility model provides a bolt flange connected system leakage rate detection device under simulation multiplex condition, the device can simulate bolt flange connected system and receive temperature, medium pressure fluctuation and apply the operational aspect under external bending moment and the mechanical oscillation effect to measure leakage rate.
The utility model discloses a concrete technical scheme as follows:
the utility model provides a leakage rate detection device of bolted flange connected system under simulation multiplex condition, includes medium feed system, medium sealing system, leakage rate detection system, load application system, heating temperature regulating system and data acquisition analytic system.
The medium sealing system comprises a bolt flange connecting system, a sealing outer cover body and a sealing inner cover body, wherein the sealing outer cover body covers the sealing inner cover body, and a sealing test cavity is formed between the two cover bodies; the sealed outer cover body is provided with an upper pipeline and a lower pipeline which are connected through a bolt flange connecting system, and a test gasket is arranged at the matching position of the flanges.
Leakage rate detecting system leaks the seal assembly, gaseous leaking hunting pipeline and the device that leaks hunting including the collection, the collection leaks the cover and covers in the bolt flange connected system outside, and collection leaks the cover upper end and leaks the seal assembly through the collection and connect on the last pipeline of the sealed dustcoat body, and collection leaks the cover lower extreme and leaks cover rack sealing connection through collection hourglass cover bolt and collection, and collection leaks the cover rack welding outside the lower pipeline of the sealed dustcoat body.
The load applying system is used for applying mechanical vibration and bending moment to the bolt flange connecting system and comprises an electro-hydraulic servo actuator and two load applying arms, the two load applying arms are respectively connected with an upper pipeline and a lower pipeline of the sealed outer cover body, and universal wheels which are supported in a rolling mode are further arranged at the bottom of a lower end socket of the lower pipeline.
Furthermore, leakage rate detecting system's collection leaks seal assembly and includes that vacuum insulation cover, adiabatic cover, O type sealing washer and O type circle compress tightly the cover, the welding of vacuum insulation cover is outside the last pipeline of sealed dustcoat body, establishes the thermal-insulated chamber of vacuum in the vacuum insulation cover, and its outside sets up adiabatic cover, and adiabatic cover compresses tightly the fitting surface of cover with O type circle and is equipped with O type circle respectively and compresses tightly the groove, and O type sealing washer compresses tightly the groove through O type circle and installs between adiabatic cover and O type circle compress tightly the cover, and O type circle compresses tightly the cover outside and leaks the cover welding as an organic whole with the collection.
Further, the medium supply system is used for conveying a gas medium to the medium sealing system and realizing the rise and fall of the medium pressure; the intelligent gas cylinder comprises a gas cylinder, a pressure reducing valve, a pressure stabilizing tank, an intelligent electric control valve and a gas inlet pipeline which are sequentially communicated; the air inlet pipeline is welded on the lower pipeline and is positioned between the load loading arm and the fixed support.
Furthermore, the heating and temperature adjusting system comprises a temperature controller and a resistance wire heater arranged in the sealed inner cover body, wherein the resistance wire heater is inserted into the sealed inner cover body from top to bottom and is installed at the top end of the upper pipeline; the heating and temperature regulating system heats the gas medium through the resistance wire heater, and regulates the temperature of the gas medium of the medium sealing system through the temperature controller so as to simulate the fluctuation of the temperature of the medium of the bolt flange connecting system under the real working condition.
Furthermore, the data acquisition and analysis system comprises a first temperature sensor arranged on the outer side of the test gasket, a second temperature sensor arranged at an inlet of the heat exchanger, a third temperature sensor arranged at an outlet of the heat exchanger and a strain gauge arranged on the bolt flange connection system.
Furthermore, the number of the strain gauges is eight, the strain gauges are respectively welded on eight flange bolts of the bolt flange connection system, and the strain gauges are used for measuring bolt stress of each flange bolt during loading.
The utility model provides a bolted flange connected system leakage rate detection method under simulation multiplex condition, is based on bolted flange connected system leakage rate detection device under above-mentioned simulation multiplex condition for operating condition under the multiplex condition of simulated bolted flange connected system under temperature fluctuation, medium pressure fluctuation, bending moment change and different frequency mechanical oscillation measures the leakage rate, includes following step:
step 1), installing a measuring device:
1.1 Mounting a ball universal rotating shaft at the bottom of the lower seal head of the lower pipeline, and then mounting a universal wheel;
1.2 Mounting a test gasket on a lower flange of the bolted flange connection system;
1.3 Mounting the upper flange to the lower flange;
1.4 Mounting a strain gauge and a first temperature sensor, wherein a connecting lead of the strain gauge and the first temperature sensor is led out through a flat cable hole A at the bottom of the leakage collecting cover rack;
1.5 Mounting a leakage collecting cover gasket on the leakage collecting cover rack;
1.6 Mounting a leakage collecting cover, placing an O-shaped sealing ring in an O-shaped sealing ring pressing groove, pressing through a heat insulation sleeve and an O-shaped ring pressing sleeve, and sealing the leakage position of a flat cable hole A at the bottom of a rack of the leakage collecting cover by using sealant so as to ensure good sealing performance of the leakage collecting cover;
1.7 The left sides of the upper fixing support and the lower fixing support are fixed with a steel frame, the mounted device is moved into a retaining ring of the fixing support, and the retaining ring is fixed, so that good stability of the device is ensured, and preparation is made for applying bending moment and mechanical vibration subsequently;
1.8 Mounting the electro-hydraulic servo actuator on the steel frame;
1.9 The buckle ring of the load loading arm is fixed on the upper pipeline and the lower pipeline, and the load loading arm is arranged on the electro-hydraulic servo actuator;
1.10 A resistance wire heater is inserted into the sealed inner cover body from top to bottom and is arranged at the top end of the upper pipeline, and a lead of the resistance wire heater is led out from the top;
1.11 Connecting wires of the strain gauge and each temperature sensor with a data acquisition unit, and connecting a liquid crystal control panel with an electro-hydraulic servo actuator; connecting a lead of the resistance wire heater with a temperature controller;
1.12 Connecting the medium supply system to the inlet duct;
1.13 Connecting a leak rate detection system to the gas leak detection conduit;
step 2), supplying a gas medium:
2.1 Opening the cylinder valve to allow the gaseous medium to flow into the pipeline;
2.2 Opening the pressure reducing valve to reduce the pressure of the gas medium, so that the gas medium flows into the pressure stabilizing tank and the pressure of the gas medium is stabilized;
step 3), adjusting the test working condition:
3.1 Opening the electro-hydraulic servo actuator and the liquid crystal control panel, wherein the electro-hydraulic servo actuator applies external force with preset magnitude and vibration with preset frequency and amplitude to the bolt flange connecting system through a load loading arm;
3.2 To obtain the volume V of the sealed leak-collecting cavity 1 Volume V of the pipe between the gas leak detection pipe and the inlet side of the heat exchanger 2 And the volume V of the pipeline between the outlet side of the heat exchanger and the three-way valve 3 ；
3.3 Opening a data acquisition and analysis system to ensure that each sensor normally operates;
3.4 The resistance wire heater is connected with a power supply, and the sealed test cavity is heated by adjusting the resistance wire heater through the temperature control instrument;
3.5 Adjusting the medium supply system to make the pressure in the medium sealing system reach the preset pressure by adjusting the intelligent electric control valve and realize the fluctuation of the pressure in the medium sealing system;
step 4), leakage medium measurement:
4.1 Temperature data of each temperature sensor in the analysis system and bolt load data measured by a strain gauge on each flange bolt are collected;
4.2 According to the leakage rate, one of 3 leakage detection modes of a helium mass spectrum leakage detection method, a U-shaped tube leakage detection method and a leakage collection cavity pressurization method is selected for measurement;
step 5), ending the experiment:
5.1 After the test is finished, the medium supply system is closed, and then high-pressure gas in the sealing system is exhausted;
5.2 Power off to cool the device;
5.3 The heating and tempering system, the load application system and the media sealing system are removed for replacement of the test pad for the next test.
Further, the helium mass spectrometer leak detection method comprises the following steps:
1) Opening an exhaust passage of the three-way valve, so that the leaked gas medium is exhausted from an exhaust passage port of the three-way valve to the outside;
2) Opening a second exhaust valve, and closing a first exhaust valve and a third exhaust valve;
3) Opening the three-way valve to communicate the front and rear gas leakage detection pipelines, and sucking the gas medium into the helium mass spectrometer leak detector through the gas leakage detection pipelines by a suction nozzle of the helium mass spectrometer leak detector;
4) And observing the change of the reading of the leak rate of the helium mass spectrometer leak detector, and recording the leak rate.
Further, the leakage-collecting cavity pressurization method comprises the following steps:
1) Opening an exhaust passage of the three-way valve, so that the leaked gas medium is exhausted from an exhaust passage port of the three-way valve to the outside;
2) Opening a third exhaust valve, and closing the first exhaust valve and the second exhaust valve;
3) Opening a three-way valve to enable the front gas leakage detection pipeline and the rear gas leakage detection pipeline to be communicated, starting timing, and measuring the pressure of a medium at an outlet of the gas leakage detection pipelines by using a micro-pressure sensor;
4) The first temperature sensor measures the temperature T of the test pad 1 ；
5) The second temperature sensor measures the temperature T of the gas medium at the inlet of the heat exchanger 2 ；
6) The third temperature sensor measures the temperature T of the gas medium at the outlet of the heat exchanger 3 ；
7) Collecting data through a data collector in a data collecting and analyzing system, and recording test data;
8) Volume V 1 、V 2 And V 3 And temperature T 1 、T 2 And T 3 And substituting the obtained product into an ideal gas state equation, obtaining the total mole number of the gas in the sealed leakage-collecting cavity according to the ideal gas state equation, and converting the mole number of the leaked medium into the volume under a standard state, thereby measuring the volume leakage rate of the gas in unit time.
Further, the U-shaped pipe leakage detection method comprises the following steps:
1) Opening an exhaust passage of the three-way valve, so that the leaked gas medium is exhausted from an exhaust passage port of the three-way valve to the outside;
2) Opening a first exhaust valve, and closing a second exhaust valve and a third exhaust valve;
3) Opening the three-way valve to communicate the front and rear gas leakage detection pipelines, starting timing, and observing the height difference of the two sides of the U-shaped pipe;
4) And calculating the leakage rate by observing the height difference change of the liquid on the two sides of the U-shaped pipe.
Compared with the prior art, the utility model, following beneficial effect has:
1. the utility model discloses can simulate multiple operating condition, adopt the mode measurement bolt flange connected system that collects the leakage medium to receive the leakage rate under the condition such as temperature fluctuation, medium pressure fluctuation, moment of flexure and mechanical oscillation to study the influence of different operating mode conditions to bolt flange connected system leakage rate, it is wide to be applicable than conventional measurement method, more presses close to the true condition.
2. The utility model discloses a leakage rate detection device for measure the leakage rate condition to bolted flange connected system, and the stress condition of bolt monitors and sealing performance aassessment, thereby predictable its life-span, guaranteed bolted flange connected system's security.
3. The utility model discloses a vacuum heat insulation seal structure forms the collection that has good sealing performance and leaks the cavity. The leakage rate detection system adopts a leakage collecting sealing assembly, so that the leakage collecting cover and the sealing outer cover body are effectively matched in a sealing manner. The leakage collecting sealing assembly sequentially adopts a vacuum heat insulation sleeve, a heat insulation sleeve, an O-shaped sealing ring and an O-shaped ring pressing sleeve, the vacuum heat insulation sleeve is heat-insulated, the heat insulation sleeve is further heat-insulated and insulated, and the O-shaped sealing ring plays a role in sealing. Adiabatic cover and O type circle compress tightly the cover and all be equipped with O type circle and compress tightly the groove, set up O type sealing washer in compressing tightly the groove, strengthen sealed effect. The vacuum heat insulation sleeve is welded on the upper pipeline, the vacuum environment is arranged inside the vacuum heat insulation sleeve, the heat insulation effect is achieved, the heat insulation sleeve wrapped on the outer layer of the vacuum heat insulation sleeve is made of heat insulation materials, the purpose is to prevent metal heat transfer, the heat insulation effect is further achieved, the influence of high-temperature working conditions on the sealing performance of the O-shaped sealing ring is prevented, and the measurement precision is improved.
4. The utility model discloses a design of system is applyed to load can apply vibration and moment of flexure respectively to bolt flange connected system, also can apply vibration and moment of flexure simultaneously. Compared with the existing device, the device has higher measurement precision for measuring the leakage rate by adopting a pressure drop method under the action of the bending moment. The pressure drop method is influenced by leakage at other positions, so that the measurement accuracy is low. The utility model discloses a collection leaks seal assembly and seals, adopts the mode of collecting the leakage medium to measure the rate, and measurement accuracy is higher.
5. The utility model discloses the collection among the device leaks the cover and has not only played the effect of collecting the leakage medium, can also prevent to blow off the explosion and cause the injury to instrument and personnel because of the test gasket, and the security is high.
Description of the drawings:
the invention will be further described with reference to the following figures and examples:
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is an enlarged view of B in FIG. 1;
FIG. 3 is a schematic structural view of the leakage detecting device of the present invention;
in the figure: 1. an upper pipeline, 2, a vacuum heat insulation sleeve, 3, a heat insulation sleeve, 4, an O-shaped ring pressing sleeve, 5, an upper flange, 6, a lower flange, 7, a flange bolt, 8, a leakage collection cover bolt, 9, a leakage collection cover gasket, 10, a leakage collection cover rack, 11, a gas leakage detection pipeline, 12, a leakage detection device, 13, a gas cylinder, 14, a pressure reducing valve, 15, a pressure stabilizing tank, 16, an intelligent electric control valve, 17, an air inlet pipeline, 18, a pipeline lower end socket, 19, a ball universal rotating shaft, 20, a universal wheel, 21, a resistance wire heater, 22, a lower pipeline, 23, a test gasket, 24, a first temperature sensor, 25, a strain gauge, 26, a data acquisition device, 27, a lower fixing support, 28, a computer, 29, a steel frame, 30, an electro-hydraulic servo actuator, 31, a liquid crystal control panel, 32, a leakage collecting cover, 33.O-shaped sealing rings, 34, a load loading arm, 35, a sealing inner cover body, 36, an upper fixing support, 37, a temperature controller, 38, a second temperature sensor, 39, a heat exchanger, 40, a third temperature sensor, 41, a three-way valve, 42, a first exhaust valve, 43.U-shaped pipes, 44, a micro-pressure sensor, 45, a second exhaust valve, 46, a helium mass spectrometer and 47, a third exhaust valve.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings:
the first embodiment is as follows:
in fig. 1, the utility model discloses a bolt flange connected system leakage rate detection device includes six systems under the simulation multiplex condition, is respectively: the device comprises a medium supply system, a medium sealing system, a leakage rate detection system, a load applying system, a heating and temperature adjusting system and a data acquisition and analysis system.
The medium supply system is used for conveying gas media to the medium sealing system, and the intelligent electric control valve 16 in the system can adjust the conveying pressure of the gas media in a short time, so that the pressure is increased or decreased, and medium pressure fluctuation is simulated;
a media sealing system for sealing the test media; the bolt flange connection device comprises a bolt flange connection system, a sealing outer cover body and a sealing inner cover body 35, wherein the sealing outer cover body covers the sealing inner cover body 35, and a sealing test cavity is formed between the two cover bodies; the sealed outer cover body is provided with an upper pipeline 1 and a lower pipeline 22 which are connected through a bolt flange connecting system, and a test gasket 23 is arranged at the flange matching position;
the leakage rate detection system is used for measuring the leakage rate of the medium leaked from the sealed test cavity; the leakage-collecting cover 32 covers the outside of a bolt flange connecting system, the upper end of the leakage-collecting cover 32 is connected to an upper pipeline 1 of a sealed outer cover body through the leakage-collecting sealing assembly, the lower end of the leakage-collecting cover 32 is connected with a leakage-collecting cover rack 10 in a sealing mode through a leakage-collecting cover bolt 8, and the leakage-collecting cover rack 10 is welded outside a lower pipeline 22 of the sealed outer cover body;
as shown in fig. 2, the leakage collecting sealing assembly of the leakage rate detection system comprises a vacuum heat insulation sleeve 2, a heat insulation sleeve 3, an O-shaped sealing ring 33 and an O-shaped ring pressing sleeve 4, wherein the vacuum heat insulation sleeve 2 is welded outside an upper pipeline 1 of the sealing outer cover body, a vacuum heat insulation cavity is arranged in the vacuum heat insulation sleeve 2, the heat insulation sleeve 3 is arranged outside the vacuum heat insulation sleeve, O-shaped ring pressing grooves are respectively arranged on matching surfaces of the heat insulation sleeve 3 and the O-shaped ring pressing sleeve 4, the O-shaped sealing ring 33 is arranged between the heat insulation sleeve 3 and the O-shaped ring pressing sleeve 4 through the O-shaped ring pressing grooves, and the outer side of the O-shaped ring pressing sleeve 4 and the leakage collecting cover 32 are welded into a whole.
The load applying system is used for applying mechanical vibration and bending moment to the bolt flange connecting system and comprises an electro-hydraulic servo actuator 30 and two load applying arms 34, the electro-hydraulic servo actuator 30 is fixedly supported by a steel frame 29, and a sealing outer cover body of the medium sealing system is also arranged on the steel frame 29 through a fixing support. The two load loading arms 34 are respectively connected with the upper pipeline 1 and the lower pipeline 22 of the sealed outer cover body, and the bottom of the lower pipeline end enclosure 18 of the lower pipeline 22 is also provided with a universal wheel 20 for rolling support.
The heating temperature adjusting system is used for adjusting and controlling the temperature of the medium sealing system and simulating temperature fluctuation; the temperature control device comprises a temperature controller 37 and a resistance wire heater 21 arranged in a sealed inner cover body 35, wherein the resistance wire heater 21 is inserted into the sealed inner cover body 35 from top to bottom and is arranged at the top end of an upper pipeline 1 through a flange structure of the resistance wire heater 21; the heating and temperature regulating system heats the gas medium through the resistance wire heater 21, and regulates the temperature of the gas medium of the medium sealing system through the temperature controller 37 so as to simulate the fluctuation of the temperature of the medium of the bolt flange connecting system under the real working condition.
And the data acquisition and analysis system is used for acquiring and processing detection data of each sensor to obtain bolt stress of the bolt flange connection system, temperature data of the sealing test cavity and temperature change and pressure change of the gas leakage detection pipeline. Comprising a first temperature sensor 24 arranged outside the test pad 23, a second temperature sensor 38 arranged at the inlet of the heat exchanger 39, a third temperature sensor 40 arranged at the outlet of the heat exchanger 39, and a strain gauge 25 arranged in the bolted flange connection system. The data acquisition and analysis system may also include a data acquisition unit 26, a computer 28, and a liquid crystal control panel 31 connected to an electro-hydraulic servo actuator 30. The number of the strain gauges 25 is 8, the strain gauges are respectively welded on 8 flange bolts 7 of a bolt flange connection system and used for measuring bolt stress of each flange bolt 7 during loading; the data collector 26 is respectively connected with the temperature sensor, the strain gauge 25, the micro-pressure sensor 44 and the computer 28, and is used for measuring the temperature change and the pressure change of the medium and providing temperature data for calculating the leakage rate by the leakage-collecting cavity pressurization method.
Example two:
the leakage rate detection device in the embodiment comprises a medium supply system, a medium sealing system, a leakage rate detection system, a load applying system, a heating and temperature adjusting system and a data acquisition and analysis system, and the specific structure is shown in fig. 1.
The medium supply system is used for conveying a gas medium to the medium sealing system and realizing the rise and fall of the pressure of the medium; comprises an air bottle 13, a pressure reducing valve 14, a pressure stabilizing tank 15, an intelligent electric control valve 16 and an air inlet pipeline 17 which are communicated in sequence. The air intake duct 17 is welded to the lower duct 22 between the load loading arm 34 and the fixed bracket. Helium can be used as a tested gas medium, and the test is safe and convenient. The gas medium reaches the surge tank 15 from the gas cylinder 13 through the pressure reducing valve 14, then passes through the intelligent electric control valve 16, the intelligent electric control valve 16 adopts a ball valve, the conveying pressure of the medium gas can be adjusted in a short time, the rise and fall of the medium pressure are realized, the fluctuation of the pressure of the gas medium introduced under the actual working condition of the bolt flange connection system is simulated, and finally the gas medium enters the gas inlet pipeline 17 and enters the medium sealing system.
The media seal system includes a bolted flange connection system, a seal inner housing 35, and a seal outer housing. The bolt flange connecting system comprises an upper flange 5, a test gasket 23, a lower flange 6 and flange bolts 7; an upper pipeline 1 is welded at the port of an upper flange 5 of the bolt flange connection system, a lower pipeline 22 is welded at a lower flange 6, and the lower end of the lower pipeline 22 is welded with a pipeline lower end enclosure 18, so that a sealed outer cover body is formed; the cavity between the inner cover body and the outer cover body forms a sealed test cavity. In this example, the sealing inner cover 35 is made of a metal material for better heat conduction.
The leakage rate detection system comprises a vacuum heat insulation sleeve 2, a heat insulation sleeve 3, an O-shaped sealing ring 33, an O-shaped ring pressing sleeve 4, a leakage collection cover 32, a leakage collection cover rack 10, a leakage collection cover gasket 9, a leakage collection cover bolt 8, a gas leakage detection pipeline 11 and a leakage detection device 12. The cross section of the leakage collecting cover rack 10 is circular and penetrates through the lower part of the welding position of the lower flange 6 and the lower pipeline 22. The leakage collecting cover 32 is arranged on the outer side of the bolt flange connecting system, and the leakage collecting cover 32 is fixedly installed with the leakage collecting cover rack 10 through a leakage collecting cover bolt 8, a leakage collecting cover gasket 9. The upper end of the leakage collecting cover 32 is welded with the O-shaped ring pressing sleeve 4, and the vacuum heat insulation sleeve 2 is welded on the upper part of the upper flange 5 welded with the upper pipeline 1. The vacuum heat insulation sleeve 2 is internally in a vacuum environment and plays a certain heat insulation role, the outer side of the vacuum heat insulation sleeve 2 is wrapped with a layer of heat insulation sleeve 3, and the heat insulation sleeve 3 is made of heat insulation materials, so that heat transfer of metal is prevented, and the heat insulation role is further played. And O-shaped sealing ring pressing grooves are arranged on the heat insulation sleeve 3 and the O-shaped ring pressing sleeve 4. The O-shaped sealing ring 33 is arranged in the O-shaped sealing ring pressing groove and is pressed through the heat insulation sleeve 3 and the O-shaped sealing ring pressing sleeve 4, so that the sealing effect is achieved. A leakage collecting cavity is formed between the leakage collecting cover 32, the vacuum heat insulation sleeve 2, the heat insulation sleeve 3, the O-shaped sealing ring 33, the O-shaped ring pressing sleeve 4 and the leakage collecting cover rack 10; a gas leakage detection pipeline 11 is arranged on one side of the bottom of the leakage collection cover rack 10, the gas leakage detection pipeline 11 conveys leaked medium gas to a leakage detection device 12, the leakage detection device 12 sequentially comprises a second temperature sensor 38, a heat exchanger 39, a third temperature sensor 40 and a three-way valve 41, and then the leaked medium gas is divided into three paths, and one path of the leaked medium gas is conveyed to a U-shaped pipe 43 through a first exhaust valve 42; the other path is connected with a third exhaust valve 47 and a micro-pressure sensor 44; the last path passes through a second vent valve 45 and a helium mass spectrometer leak detector 46 in sequence. Therefore, the leakage rate can be measured by selecting one of the three leakage measuring modes according to the leakage rate. The other side of the bottom of the leakage collecting cover rack 10 is provided with a wire arrangement hole A, and wires of the strain gauge 25 and the first temperature sensor 24 penetrate through the wire arrangement hole A to be connected with the data acquisition unit 26. And sealing the flat cable hole A by using a sealant after the flat cable is finished so as to ensure good sealing performance of the leakage collecting cavity.
The load applying system comprises an electro-hydraulic servo actuator 30, a load applying arm 34, an upper fixing support 36, a lower fixing support 27 and universal wheels 20, wherein the electro-hydraulic servo actuator 30 is fixed on a steel frame 29, the magnitude of external force applied to the upper pipeline 1 and the lower pipeline 22, the frequency and the amplitude of vibration and the like can be adjusted through a liquid crystal control panel 31, and then the load applying arm 34 applies vibration and bending moment to the bolt flange connecting system. A load loading arm 34 is provided between the upper mounting bracket 36 and the upper flange 5, and between the lower mounting bracket 27 and the lower flange 6, respectively. A fixing bracket is respectively arranged between the two sides of the load loading arm 34 and the top ends of the upper and lower pipelines to be connected with the steel frame 29, so as to fix the device. The fixed bracket interacts with the load loading arm 34 to apply the bending moment required for the test as well as vibrations of different frequencies and different amplitudes. At the bottom of the device is a universal wheel 20 which can be steered 360 degrees and which can both facilitate the movement of the device and support the measuring device. And the load applying system is used for simulating mechanical vibration and external bending moment applied to the bolt flange connecting system in actual working conditions.
The heating and temperature adjusting system comprises a resistance wire heater 21 and a temperature controller 37 which are arranged in the sealed inner cover body 35. The resistance wire heater 21 is inserted into the sealed inner cover body 35 from top to bottom, and is dropped on the top end of the upper pipeline 1 through a flange structure carried by the resistance wire heater 21, and a lead of the resistance wire heater is led out from the top and is connected with a temperature controller 37. The heating and temperature adjusting system heats the gas medium through the resistance wire heater 21, and adjusts the gas medium temperature of the medium sealing system through the temperature controller 37 to simulate the fluctuation of the medium temperature of the bolt flange connecting system under the real working condition.
The data acquisition and analysis system comprises a first temperature sensor 24 arranged on the outer side of the test gasket 23, a second temperature sensor 38 arranged at the inlet of a heat exchanger 39, a third temperature sensor 40 arranged at the outlet of the heat exchanger 39, and a strain gauge 25 arranged on the flange bolt 7, and is further provided with a data acquisition unit 26, a computer 28 and a liquid crystal control panel 31. The bolt flange connecting system is provided with eight sets of bolt flange structures, the number of the strain gauges is 8, the strain gauges are respectively welded on the flange bolts 7 and used for measuring the bolt stress of each flange bolt 7 during loading, accurate bolt force loading is ensured, and the bolt stress change of the flange bolts 7 can be measured when vibration and bending moment are applied. The liquid crystal control panel 31 is connected to the electro-hydraulic servo actuator 30 through a wire, and is used for displaying information such as the magnitude of an external force acting on the upper pipe 1 and the lower pipe 22, and the frequency and amplitude of vibration. The data collector 26 is respectively connected with the first temperature sensor 24, the second temperature sensor 38, the third temperature sensor 40, the strain gauge 25, the micro-pressure sensor 44 and the computer 28, and is used for measuring the temperature change and the pressure change of the medium and providing temperature change and gas medium pressure data for calculating the leakage rate by the leak-collecting cavity pressurization method. The system takes a computer 28 as a core, various sensors convert various measured parameters into analog voltage signals, the analog voltage signals are amplified or attenuated by an amplifier, the analog voltage signals are converted into digital values by an A/D converter, and the digital values are connected with the computer 28 through an input interface. The test results can be output through the peripheral device in different forms such as data, tables, curves or fitting formulas.
Example three:
the further design of this embodiment lies in: in the embodiment, the leakage rate measuring device of the bolt flange connecting system under the action of vibration and bending moment, and the medium supply system simulates medium pressure fluctuation of the bolt flange connecting system under the actual working condition; the load application system simulates bending moment effects and mechanical vibration of different sizes of the bolt flange connection system under actual working conditions; the heating and temperature regulating system simulates temperature fluctuation of the bolt flange connecting system under the actual working condition. Through the measurement to bolted flange connected system leakage rate under the operating condition, be favorable to improving the accuracy of bolted flange connected system sealing performance aassessment and life prediction.
The utility model discloses a measuring device can further develop single factor or multifactor (like temperature fluctuation, medium pressure fluctuation, the mechanical oscillation of different frequencies, amplitude, the moment of flexure of equidimension not) and leak the influence test of rate to the bolt flange joint system. And measuring the leakage rate of the bolted flange connection system under the conditions of temperature fluctuation, medium pressure fluctuation, bending moment, mechanical vibration and the like, thereby researching the influence of different working conditions on the leakage rate of the bolted flange connection system.
Example four:
the utility model discloses bolt flange connected system leaks leakage rate detection method under simulation multiplex condition, including following step:
step 1), installing a measuring device:
1.1 A ball universal rotating shaft 19 is arranged at the bottom of the lower pipe end socket 18, and a universal wheel 20 is arranged;
1.2 Mounting a test gasket 23 on the lower flange 6 of the bolted flange connection system;
1.3 Mounting the upper flange 5 to the lower flange 6;
1.4 Mounting a strain gauge 25 and a first temperature sensor 24, wherein connecting wires of the strain gauge 25 and the first temperature sensor 24 are led out through a flat cable hole A at the bottom of the leakage collecting cover rack 10;
1.5 Mounting a leak collecting cover gasket 9 on a leak collecting cover rack 10;
1.6 Mounting a leakage collecting cover 32, placing an O-shaped sealing ring 33 in an O-shaped sealing ring pressing groove, pressing the O-shaped sealing ring by a heat insulation sleeve 3 and an O-shaped sealing ring pressing sleeve 4, and sealing the leakage part of a wire arranging hole A at the bottom of a leakage collecting cover rack 10 by using a sealant, thereby ensuring good sealing performance of the leakage collecting cover 32;
1.7 The fixed bracket comprises an upper fixed bracket and a lower fixed bracket, the left sides of the upper fixed bracket 36 and the lower fixed bracket 27 are fixed with the steel frame 29, and then the installed device is moved into a snap ring of the fixed bracket to fix the snap ring, so as to ensure good stability of the device and prepare for applying bending moment and mechanical vibration subsequently;
1.8 Mounting the electro-hydraulic servo actuator 30 on the steel frame 29;
1.9 The buckles of the load loading arm 34 are fixed on the upper pipeline 1 and the lower pipeline 22, and the load loading arm 34 is arranged on the electro-hydraulic servo actuator 30;
1.10 The resistance wire heater 21 is inserted into the sealed inner cover body 35 from top to bottom, and the resistance wire heater 21 is arranged at the top end of the upper pipeline 1 by virtue of a flange structure provided by the resistance wire heater 21, and a lead of the resistance wire heater is led out from the top;
1.11 Connecting wires of the strain gauge 25 and each temperature sensor with the data acquisition unit 26, and connecting the liquid crystal control panel 31 with the electro-hydraulic servo actuator 30; the lead of the resistance wire heater 21 is connected with a temperature controller 37;
1.12 Connecting the medium supply system to the inlet duct 17;
1.13 Connecting a leak rate detection system to the gas leak detection line 11;
step 2), supplying a gas medium:
2.1 Opening the valve of the gas cylinder 13 to allow the gas medium to flow into the pipeline;
2.2 Open the pressure reducing valve 14 to reduce the pressure of the gaseous medium, so that the gaseous medium flows into the surge tank 15 and the pressure of the gaseous medium is stabilized;
step 3), adjusting the test working condition:
3.1 Opening the electro-hydraulic servo actuator 30 and the liquid crystal control panel 31, wherein the electro-hydraulic servo actuator 30 applies external force with preset magnitude and vibration with preset frequency and amplitude to the bolt flange connection system through the load loading arm 34;
3.2 To obtain the volume V of the sealed leak-collecting cavity 1 The volume V of the conduit between the gas leak detection conduit 11 and the inlet side of the heat exchanger 39 2 (ii) a Volume V of pipeline between outlet side of heat exchanger 39 and three-way valve 41 3 ；
3.3 Opening a data acquisition and analysis system to ensure that each sensor operates normally;
3.4 The resistance wire heater 21 is powered on, and the sealed test cavity is heated by adjusting the resistance wire heater 21 through the temperature controller 37;
3.5 Adjusting the medium supply system to make the pressure in the medium sealing system reach the preset pressure by adjusting the intelligent electric control valve 16 and realize the fluctuation of the pressure in the medium sealing system;
step 4), measuring a leakage medium:
4.1 Temperature data of each temperature sensor in the analysis system and bolt load data measured by the strain gauge 25 on each flange bolt 7 are collected;
4.2 According to the leakage rate, selecting a proper leakage detection mode, such as helium mass spectrum leakage detection method, U-shaped tube leakage detection method or leakage collection cavity pressurization method, to measure;
step 5), ending the experiment:
5.1 After the test is finished, the medium supply system is closed, and then high-pressure gas in the sealing system is exhausted;
5.2 Turn off power to cool the device;
5.3 The heating and tempering system, the load application system and the media sealing system are removed for replacement of the test pad 23 for the next test.
Adopt the utility model discloses simulation bolted flange connected system is receiving temperature, medium pressure fluctuation and receiving the true operating condition under external bending moment and the vibration effect to measure its leakage rate, can guide the change cycle of gasket in the industry.
Example five:
further optional designs of this example are: in fig. 3, the test steps for the helium mass spectrometer leak detection measurement are as follows:
1) Opening the exhaust passage of the three-way valve 41 so that the leaking gas medium is discharged from the exhaust passage port of the three-way valve 41 to the outside;
2) Opening the second exhaust valve 45, closing the first exhaust valve 42 and the third exhaust valve 47;
3) Opening the three-way valve 41 to communicate the front and rear gas leakage detection pipelines 11, and sucking the gas medium into the helium mass spectrometer leak detector 46 through the gas leakage detection pipelines 11 by a suction nozzle of the helium mass spectrometer leak detector 46;
4) The helium mass spectrometer leak detector 46 is observed for a change in leak rate readings and a leak rate record is made.
Example six:
further optional designs of this example are: because the utility model discloses need the operating mode of simulation high temperature, and the pressure drop method accuracy nature under the high temperature operating mode can receive the influence, so adopt the collection to leak cavity pressurization method and measure the leakage rate more accurate. In fig. 3, the test steps measured by the pressurization method of the leak-collecting cavity in the present example are as follows:
1) Opening the exhaust passage of the three-way valve 41 so that the leaking gas medium is discharged from the exhaust passage port of the three-way valve 41 to the outside;
2) Opening the third exhaust valve 47, closing the first exhaust valve 42 and the second exhaust valve 45;
3) Opening the three-way valve 41 to communicate the front and rear gas leakage detection pipelines 11, starting timing, and measuring the pressure of a medium at the outlet of the gas leakage detection pipeline 11 by using the micro-pressure sensor 44;
4) The first temperature sensor 24 measures the temperature T of the test pad 23 1 ；
5) The second temperature sensor 38 measures the temperature T of the gaseous medium at the inlet of the heat exchanger 39 2 ；
6) The third temperature sensor 40 measures the temperature T of the gaseous medium at the outlet of the heat exchanger 39 3 ；
7) Collecting data through a data collector 26 in the data collecting and analyzing system, and recording test data;
8) Volume V 1 、V 2 And V 3 And temperature T 1 、T 2 And T 3 And substituting the obtained result into an ideal gas state equation, obtaining the total mole number of the sealed leakage collection cavity according to the ideal gas state equation, and converting the mole number of the leaked medium into the volume under a standard state, thereby measuring the volume leakage rate of the gas in unit time.
Example seven:
further optional designs of this example are: in fig. 3, the test procedure of the U-tube leak detection method is as follows:
1) Opening the exhaust passage of the three-way valve 41 so that the leaking gas medium is discharged from the exhaust passage port of the three-way valve 41 to the outside;
2) Opening the first exhaust valve 42, closing the second exhaust valve 45 and the third exhaust valve 47;
3) Opening the three-way valve 41 to communicate the front and rear gas leakage detection pipelines 11, starting timing, and observing the height difference of the two sides of the U-shaped pipe 43;
4) The leakage rate is calculated by observing the change of the height difference of the liquid on the two sides of the U-shaped pipe 43.
Claims (6)
1. The utility model provides a bolted flange connected system leakage rate detection device under simulation multiplex condition, includes that medium feed system, medium sealing system, leakage rate detecting system, load apply system, heating temperature regulating system and data acquisition analytic system, its characterized in that:
the medium sealing system comprises a bolt flange connecting system, a sealing outer cover body and a sealing inner cover body (35), wherein the sealing outer cover body covers the sealing inner cover body (35), and a sealing test cavity is formed between the two cover bodies; the sealed outer cover body is provided with an upper pipeline (1) and a lower pipeline (22) which are connected through a bolt flange connecting system, and a test gasket (23) is arranged at the flange matching position;
the leakage rate detection system comprises a leakage collecting cover (32), a leakage collecting sealing assembly, a gas leakage detecting pipeline (11) and a leakage detecting device (12), wherein the leakage collecting cover (32) covers the outside of the bolt flange connecting system, the upper end of the leakage collecting cover (32) is connected to an upper pipeline (1) of the sealed outer cover body through the leakage collecting sealing assembly, the lower end of the leakage collecting cover (32) is connected with a leakage collecting cover rack (10) in a sealing mode through a leakage collecting cover bolt (8), and the leakage collecting cover rack (10) is welded to the outside of a lower pipeline (22) of the sealed outer cover body;
the load applying system is used for applying mechanical vibration and bending moment to the bolt flange connecting system and comprises an electro-hydraulic servo actuator (30) and two load applying arms (34), the two load applying arms (34) are respectively connected with an upper pipeline (1) and a lower pipeline (22) of a sealed outer cover body, and universal wheels (20) supported in a rolling mode are further arranged at the bottom of a lower pipeline sealing head (18) of the lower pipeline (22).
2. The device for detecting the leakage rate of the bolted flange connection system under the simulated multi-working condition according to claim 1, is characterized in that: leak rate detecting system's collection is leaked seal assembly and is included vacuum insulation cover (2), adiabatic cover (3), O type sealing washer (33) and O type circle and is compressed tightly cover (4), the welding of vacuum insulation cover (2) is outside sealed dustcoat's last pipeline (1), establishes vacuum heat insulating chamber in vacuum insulation cover (2), and its outside sets up adiabatic cover (3), and adiabatic cover (3) compress tightly the fitting surface of cover (4) with O type circle and are equipped with O type circle respectively and compress tightly the groove, and O type sealing washer (33) compress tightly the groove through O type circle and install between adiabatic cover (3) and O type circle and compress tightly cover (4), and O type circle compresses tightly the cover (32) welding as an organic whole with the collection in the cover (4) outside.
3. The device for detecting the leakage rate of the bolted flange connection system under the simulated multi-working condition according to claim 1 or 2, characterized in that: the medium supply system is used for conveying gas media to the medium sealing system and comprises a gas cylinder (13), a pressure reducing valve (14), a pressure stabilizing tank (15), an intelligent electric control valve (16) and a gas inlet pipeline (17) which are communicated in sequence.
4. The device for detecting the leakage rate of the bolted flange connection system under the simulated multi-working condition according to claim 3, is characterized in that: the heating and temperature regulating system comprises a temperature controller (37) and a resistance wire heater (21) arranged in a sealed inner cover body (35), wherein the resistance wire heater (21) is inserted into the sealed inner cover body (35) from top to bottom and is arranged at the top end of the upper pipeline (1).
5. The device for detecting the leakage rate of the bolted flange connection system under the simulated multi-working condition according to claim 3, characterized in that: the data acquisition and analysis system comprises a first temperature sensor (24) arranged on the outer side of a test gasket (23), a second temperature sensor (38) arranged at an inlet of a heat exchanger (39), a third temperature sensor (40) arranged at an outlet of the heat exchanger (39), and a strain gauge (25) arranged on a bolt flange connection system.
6. The device for detecting the leakage rate of the bolted flange connection system under the simulated multi-working condition according to claim 5, characterized in that: the eight strain gauges (25) are respectively welded on eight flange bolts (7) of the bolt flange connection system and used for measuring bolt stress of each flange bolt (7) during loading.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222259422.3U CN217901138U (en) | 2022-08-26 | 2022-08-26 | Device for detecting leakage rate of bolt flange connection system under simulation of multiple working conditions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222259422.3U CN217901138U (en) | 2022-08-26 | 2022-08-26 | Device for detecting leakage rate of bolt flange connection system under simulation of multiple working conditions |
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| CN202222259422.3U Active CN217901138U (en) | 2022-08-26 | 2022-08-26 | Device for detecting leakage rate of bolt flange connection system under simulation of multiple working conditions |
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