CN103698092A - Quantitative leakage detection device of pressure system - Google Patents

Quantitative leakage detection device of pressure system Download PDF

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CN103698092A
CN103698092A CN201310749602.2A CN201310749602A CN103698092A CN 103698092 A CN103698092 A CN 103698092A CN 201310749602 A CN201310749602 A CN 201310749602A CN 103698092 A CN103698092 A CN 103698092A
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chamber
pressure system
seal
gas
detection
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CN103698092B (en
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马志刚
韩嘉兴
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Suzhou Bao Hua sealing Polytron Technologies Inc
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Suzhou Baohua Mechanical Technology Co Ltd
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Abstract

The invention discloses a quantitative leakage detection device of a pressure system. By arranging a leakage guide chamber on the pressure system, substances which leak out from a sealed position of a pressure chamber of the pressure system can be enabled to enter the leakage guide chamber, then relatively dry detection gas is heated to temperature as much as possible close to the temperature of working medium in the pressure chamber and then is blown into the leakage guide chamber, and the absolute humidity and flow of the detection gas are measured before heating; the detection gas and the substances which leak into the leakage guide chamber from the pressure chamber are mixed to form a mixture, the mixture is blown out through an outlet and enters a constant-temperature device, the constant-temperature device adjusts the range of constant temperature according to the situation whether the absolute humidity of the mixture reaches a saturation value or not, then the flow of the vapor part of the mixture which flows out of the constant-temperature device is detected, the mass of condensate which flows out from the constant-temperature device is collected and weighed, and the specific numerical value of the amount of leakage at the sealed position of the pressure system within certain time can be known through calculation, so that the sealed condition of the pressure system can be known in real time.

Description

The quantitative leak detecting device of pressure system
Technical field
The present invention relates to a kind of quantitative leak detecting device of pressure system.
Background technology
In the industrial sectors such as nuclear power, thermoelectricity, the energy, often have vapour system, these vapor compression system are the pressure systems that formed by sealing between equipment and pipeline flange.And for pressure system, leakage is absolute, it is relative not leaking, as long as the seal leakage amount of system meets the maximum that the factors such as environmental protection, safety and economy determine, allows slip index, can think that system do not leak.Pressure system packoff is when manufacturing, install, debugging or turning round, not only need to know that it has or not leakage, but also need to know the size of leakage rate, can the leakage rate of pressure system is carried out to quantitative detection becomes judgement leakage rate and meet the key that allows to leak index.Meanwhile, in the process of using in the running of pressure system packoff, its leakage is carried out quantitatively detecting and monitoring, can guarantee the safe operation of system, therefore, the seal leakage of pressure system is carried out to quantitative detection and also become whether effectively gordian technique of judgement sealing.
Summary of the invention
The quantitative leak detecting device that the object of this invention is to provide a kind of pressure system, thus the seal leakage amount of vapor compression system is quantitatively detected.
For achieving the above object, the technical solution used in the present invention is:
A kind of quantitative leak detecting device of pressure system, pressure system to be detected has the pressure chamber of sealing, described pressure chamber arranges by being circumferentially the first seal sealing of closed form, the outside perimembranous of described the first seal is equipped with the second seal, between described the first seal, described the second seal and described pressure system, form and airtight collect the drawing of material leaking out through described pressure chamber and leak chamber, the described leakage chamber of drawing has import and the outlet being connected with described pressure system outside, and described pick-up unit also comprises:
Accumulator unit, stores the detection gas that is difficult for making described the first seal and described the second seal oxidation or corrosion;
First flow meter, the flow for detection of the described detection through described accumulator unit output with gas;
The first hygronom, the absolute humidity for detection of the described detection through described accumulator unit output with gas;
Synchronous Heating device, for the described detection of described accumulator unit output is heated with gas and the described detection after heating is delivered to by described import with gas described in draw and leak chamber, described detection draws in described drawing described in being bled into described pressure chamber in leaking chamber the described material formation potpourri that leaks chamber with gas;
Thermostat, its air intake opening with described in draw the described outlet of leaking chamber and be connected, for leaking by drawing described in warp that described potpourri that the described outlet in chamber flows out heats or cooling its temperature constant that makes is being specified within the scope of constant temperature;
The second hygronom, for measuring the absolute humidity of potpourri described in described thermostat, and feeds back to described thermostat to determine the described constant temperature scope of described thermostat by this absolute humidity value;
The second flowmeter, for measuring the flow of the described potpourri flowing out after described thermostat constant temperature is processed;
Liquid-collecting bottle, the condensate water producing through described thermostat for collecting described potpourri;
Weighing device, for weighing the quality of obtaining described condensate water.
Further, described pressure system comprises vessel flange and the end cap flange interfixing, described vessel flange has equipment cavity, described the first seal is located between described vessel flange and described end cap flange hermetically, between described equipment cavity and described end cap flange, described the first seal, forms described pressure chamber.
Preferably, the gas outlet of described Synchronous Heating device and described in draw between the described import of leaking chamber and be provided with the first thermometer.
Preferably, described in, draw the described outlet of leaking chamber and draw the bottom of leaking chamber described in being located at.
Further, described in, draw the described import of leaking chamber and described outlet and lay respectively at the phase heterodoxy of described pressure system.
Preferably, described accumulator unit is to store the gas-holder of gas for described detection, and the place, gas outlet of described gas-holder is provided with tensimeter.
Preferably, described thermostat is provided with the second thermometer that can be used for measuring described thermostat internal temperature.
Utilization due to technique scheme, the present invention compared with prior art has following advantages: the quantitative leak detecting device of pressure system of the present invention, for the seal leakage of vapor compression system is quantitatively detected, wherein by arrange one on pressure system, draw leakage chamber, making material that the pressure chamber of pressure system leaks out in sealing place enter to draw leaks in chamber, then by the detection of relatively dry with gas-heated to pressure chamber in actuating medium temperature be blown into draw after approaching as far as possible and leak in chamber, heating pre-test detects absolute humidity and the flow with gas, detection is bled into pressure chamber the material drawing in leakage chamber with gas and is mixed to form potpourri in drawing leakage chamber, then this potpourri is blown out and enters thermostat through outlet, thermostat according to the absolute humidity of potpourri whether the value of reaching capacity adjust the temperature range of constant temperature, and then steam state flow partly in the potpourri of detection thermostat outflow, and collect and weigh the quality of the condensate water flowing out through thermostat, by calculating the concrete numerical value of the seal leakage amount that just can know certain hour internal pressure system, can be to immediately knowing the sealing condition of pressure system according to sealing leakage rate, applicable to nuclear power, thermoelectricity, the quantitative detection of the seal leakage amount of equipment and pipeline flange in the vapor compression system of the industrial sectors such as the energy.This structure of the detecting device is simple, detects operation also more for convenience.
Quantitative testing result according to this leakage rate, can reach following object:
1, can verify seal designs slip, thus rationality and the security of checking seal designs;
2, the leakage rate that can be used for (temperature, pressure, medium etc. change) under variable working condition condition detects, and then can obtain operating mode (temperature, pressure, the medium etc.) condition of seal and the corresponding relation between leakage rate, thereby can determine the leakage rate under sealing part works condition, for the designs such as link of seal and seal provide accurately Data support;
3, can detect in time the situation of change of seal leakage rate under condition of work, according to the relation of operating condition and leakage rate, can judge the safe and effective situation of sealing, by the timely detection of leakage rate, can reach and leak before critical value in leakage rate, take in advance safe and effective measure, guarantee the safe and reliable of sealing.Particularly whether reliable the very high field of some safety requirements, as nuclear power and petrochemical industry etc., by the timely detection to seal leakage amount, can monitor sealing, in time for equipment safety operation provides safety guarantee.
Accompanying drawing explanation
The structural representation that accompanying drawing 1 is pick-up unit of the present invention.
Where: 1, storage devices; 2, the first meter; 3, the first moisture meter; 4, synchronous heating device; 5, pressure systems; 51, equipment flange; 52, cover flange; 53, pressure vessels 6, the first seal;; chamber 7, the second seal; 8, cited drain chamber; 9, thermostat; 10 second humidity instrument; 11, a second flow meter; 12 gauge; 13, set the liquid bottled; 14, a weighing device; 15, the first thermometer; 16, the second thermometer.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment of the present invention, technical scheme of the present invention is further elaborated.
Pick-up unit for adopting in the present embodiment shown in Figure 1.Pressure system 5 to be detected is vapor compression system, it comprises vessel flange 51 and the end cap flange 52 interfixing, wherein vessel flange 51 has equipment cavity, end cap flange 52 is located at the oral area of equipment cavity for sealing this equipment cavity, between end cap flange 52 and vessel flange 51, by being circumferentially the first seal 6 of closed form, seal, make to form between equipment cavity and end cap flange 52, the first seal 6 pressure chamber 53 of sealing, the actuating medium of pressure system 5 is located in pressure chamber 53, is steam or the water of High Temperature High Pressure in pressure chamber 53 herein.
For the seal leakage amount of the first seal 6 on pressure system 5 is quantitatively detected, between the vessel flange 51 of pressure system 5 and end cap flange 52, be also provided with the second seal 7, the second seal 7 rings are located at the outside perimembranous of the first seal 6, here, the first seal 6 and the second seal 7 all can adopt the O-ring seal of ring-type, and the diameter of the second seal 7 is greater than the diameter of the first seal 6.Like this, between the vessel flange 51 of the first seal 6, the second seal 7 and pressure system 5, end cap flange 52, just formed to draw and leaked chamber 8, if the sealing of the pressure chamber 53 of pressure system 5 produces, leak, the material leaking out in pressure chamber 53 can enter to draw and leak in chamber 8.The pressure bearing due to second seal 7 in outside is little, and in testing process, substantially without leaking, in testing process, its leakage rate can be ignored.Draw on leakage chamber 8 and offer import and the outlet being connected with pressure system 5 outsides, this import and outlet lay respectively at the different both sides of pressure system 5.
Shown in Figure 1, this pick-up unit also comprises accumulator unit 1, Synchronous Heating device 4, thermostat 9, accumulator unit 1 is for storing the gas-holder detecting with gas, detection need be selected according to the material of the first seal 6 and the second seal 7 with gas, can adopt as nitrogen, helium, air etc. not can with the first seal 6, there is the non-oxidizing gas of oxidation or corrosion reaction in the second seal 7, can avoid like this detecting being filled with to draw after leaking in chamber 8 with gas the first seal 6 oxidations or corrosion is occurred to and the sealing of breaking pressure system 5, also avoid it that oxidation reactions or corrosion are occurred the second seal 7 to and destroy to draw and leak the sealing in chamber 8 and affect testing result.The place, gas outlet of accumulator unit 1 is provided with tensimeter 12, uses the pressure of gas for detection of the detection of accumulator unit 1 gas outlet output.Between accumulator unit 1 and Synchronous Heating device 4, be provided with first flow meter 2 and the first hygronom 3, to detect, enter flow and the absolute humidity of gas for the detection of Synchronous Heating device 4.Detect with gas and enter and draw leakage chamber 8 by drawing the import of leaking chamber 8 through 4 heating of Synchronous Heating device, between the import in Yu Yinlou chamber, the gas outlet of Synchronous Heating device 48, be provided with the first thermometer 15, for detection of flowing into and draw the temperature that gas is used in the detection of leaking in chamber 8 after 4 heating of Synchronous Heating device, the temperature that the first thermometer 15 detects should be close as far as possible with the temperature of actuating medium in pressure system 5 upward pressure cavity volumes 53, can avoid causing like this Local cooling of the first seal 6, thereby avoid the first seal 6 in testing process deform and cause the destruction to pressure system 5 sealings.
After detection after above-mentioned heating enters and draws and leak in chamber 8 with gas, be bled into and draw the steam or the water that leak in chamber 8 and mix and form potpourri with pressure chamber 53, this potpourri leaks chamber 8 outlet through drawing enters in thermostat 9.
On thermostat 9, be provided with the second thermometer 16, it can be used to monitor the temperature of thermostat 9 inside.The endpiece of thermostat 9 is provided with the second hygronom 10, for detection of the absolute humidity that enters thermostat 9 interior potpourris, thermostat 9 is determined the temperature range of thermostat 9 constant temperature according to the numerical value of this absolute humidity, when absolute humidity value value of not reaching capacity that the second hygronom 10 detects, thermostat 9 is between potpourri constant temperature to 100 ℃~200 ℃, makes the temperature of potpourri not too high and remain steam state; If absolute humidity value value of reaching capacity that the second hygronom 10 detects, thermostat 9 is by between potpourri constant temperature to 0~100 ℃, potpourri is cooled between 0~100 ℃, its temperature is reduced, in potpourri, the not detected actuating medium condensation by gas absorption forms condensate water, and the condensate water of formation is collected and weighed and obtain its quality through weighing device 14 through liquid-collecting bottle 13.The exit of thermostat 9 is also provided with the second flowmeter 11, for detection of the flow of steam state part in the potpourri flowing out after thermostat 9 constant temperature are processed.
During detection, according to testing requirement by total detection time t be divided into n section, n>=1,
Figure BDA0000450647980000051
i is arbitrary positive integer in 1 to n; Record t i(hour) testing result in the period is as follows respectively:
The flow of first flow meter 2 is q 1i(cube m/h);
The absolute humidity of the first hygronom 3 is H 1i(gram/cubic metre);
The absolute humidity of the second hygronom 10 is H 2i(gram/cubic metre);
The flow of the second flowmeter 11 is q 2i(cube m/h);
Obtain above q 1i, H 1i, H 2i, q 2idetection data n group altogether;
The condensed fluid gross mass that weighing device 14 detects in the liquid-collecting bottle 13 obtaining is g(gram);
When g=0, always detection time, t internal leakage was all smaller, and the potpourri entering in testing process in thermostat 9 is unsaturated state; And when g > 0, in t, have at least a period of time leakage rate larger total detection time.According to testing result, can calculate in the following manner under unsaturated state seal leakage amount and the slip of (g > 0, when leakage rate is larger) pressure system 5 under (g=0, leakage rate hour) and state of saturation, distinguish as follows:
1. unsaturated state:
Particular detection time t iinterior leakage rate is: L' i=(q 2i* H 2i-q 1i* H 1i) t i, unit: gram;
Instantaneous leak rate is: q 2i* H 2i-q 1i* H 1i, unit: Grams Per Hour;
The interior total leakage rate of t detection time is: L ″ = Σ i = 1 n L ′ i = L ′ 1 + L ′ 2 + . . . + L ′ n , Unit: gram;
T internal leakage detection time rate: L=L "/t, unit: Grams Per Hour.
2. state of saturation:
The total leakage rate of state of saturation:
B = L ″ + g = Σ i = 1 n L ′ i + g = Σ i = 1 n ( q 2 i × H 2 i - q 1 i × H 1 i ) t i + g , Unit: gram;
State of saturation slip:
C = B / t = B / Σ i = 1 n t i = B / ( t 1 + t 2 + . . . + t n ) = L + g / t , Unit: Grams Per Hour.
When T.T. t mono-timing, the frequency n of measurement is more, and the time interval is shorter, and the leakage rate in special time more can reflect the instantaneous leak amount of pressure system, and the result of measurement is also more accurate.
To sum up, adopt pick-up unit of the present invention and just can to the leakage rate of pressure system 5, quantitatively detect easily in conjunction with above-mentioned detection method, can immediately know the sealing condition of pressure system 5, applicable to nuclear power, thermoelectricity, the quantitative detection of the seal leakage amount of equipment and pipeline flange in the vapor compression system of the industrial sectors such as the energy, according to the quantitative testing result of this leakage rate, not only can verify seal designs slip, thereby rationality and the security of checking seal designs, and can be used for (temperature under variable working condition condition, pressure, media etc. change) leakage rate detect, and then can obtain the operating mode (temperature of seal, pressure, medium etc.) corresponding relation between condition and leakage rate, thereby can determine the leakage rate under sealing part works condition, for the designs such as link of seal and seal provide accurately Data support.
In addition, adopt above-mentioned detection device quantitatively to detect the seal leakage amount of pressure system 5, can detect in time the situation of change of seal leakage rate under condition of work, according to the relation of operating condition and leakage rate, can judge the safe and effective situation of sealing, by the timely detection of leakage rate, can reach and leak before critical value in leakage rate, take in advance safe and effective measure, guarantee the safe and reliable of sealing.Particularly whether reliable the very high field of some safety requirements, as nuclear power and petrochemical industry etc., by the timely detection to seal leakage amount, can monitor sealing, in time for equipment safety operation provides safety guarantee.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.

Claims (8)

1. the quantitative leak detecting device of a pressure system, pressure system to be detected (5) has the pressure chamber (53) of sealing, described pressure chamber (53) arranges by being circumferentially the first seal (6) sealing of closed form, it is characterized in that: the outside perimembranous of described the first seal (6) is equipped with the second seal (7), described the first seal (6), between described the second seal (7) and described pressure system (5), form and airtight collect the drawing of material leaking out through described pressure chamber (53) and leak chamber (8), the described leakage chamber (8) of drawing has import and the outlet being connected with described pressure system (5) outside, described pick-up unit also comprises:
Accumulator unit (1), stores and is difficult for that described the first seal (6) and described the second seal (7) are oxidized or the detection gas of corrosion;
First flow meter (2), the flow for detection of the described detection through described accumulator unit (1) output with gas;
The first hygronom (3), the absolute humidity for detection of the described detection through described accumulator unit (1) output with gas;
Synchronous Heating device (4), for the described detection of described accumulator unit (1) output is heated with gas and the described detection after heating is delivered to by described import with gas described in draw and leak chamber (8), described detection draws in described drawing described in being bled into described pressure chamber (53) in leaking chamber (8) the described material formation potpourri that leaks chamber (8) with gas;
Thermostat (9), its air intake opening with described in draw the described outlet of leaking chamber (8) and be connected, for leaking that described potpourri that the described outlet in chamber (8) flows out heats or cooling its temperature constant that makes is being specified within the scope of constant temperature through described drawing;
The second hygronom (10), for measuring the absolute humidity of potpourri described in described thermostat (9), and feeds back to described thermostat (9) to determine the described constant temperature scope of described thermostat by this absolute humidity value;
The second flowmeter (11), for measuring the flow of the described potpourri flowing out after described thermostat (9) constant temperature is processed;
Liquid-collecting bottle (13), the condensate water producing through described thermostat (9) for collecting described potpourri;
Weighing device (14), for weighing the quality of obtaining described condensate water.
2. the quantitative leak detecting device of pressure system according to claim 1, is characterized in that: described the first seal (6), described the second seal (7) are grommet type seals.
3. the quantitative leak detecting device of pressure system according to claim 1 and 2, it is characterized in that: described pressure system (5) comprises vessel flange (51) and the end cap flange (52) interfixing, described vessel flange (51) has equipment cavity, described the first seal (6) is located between described vessel flange (51) and described end cap flange (52) hermetically, between described equipment cavity and described end cap flange (52), described the first seal (6), forms described pressure chamber (53).
4. the quantitative leak detecting device of pressure system according to claim 1, is characterized in that: the gas outlet of described Synchronous Heating device (4) and described in draw between the described import of leaking chamber (8) and be provided with the first thermometer (15).
5. the quantitative leak detecting device of pressure system according to claim 1, is characterized in that: described in draw the described outlet of leaking chamber (8) and draw the bottom of leaking chamber (8) described in being located at.
6. the quantitative leak detecting device of pressure system according to claim 1 or 5, is characterized in that: described in draw the phase heterodoxy that the described import of leaking chamber (8) and described outlet lay respectively at described pressure system (5).
7. the quantitative leak detecting device of pressure system according to claim 1, is characterized in that: described accumulator unit (1) is for storing the gas-holder of gas for described detection, and the place, gas outlet of described gas-holder is provided with tensimeter (12).
8. the quantitative leak detecting device of pressure system according to claim 1, is characterized in that: described thermostat (9) is provided with the second thermometer (16) that can be used for measuring described thermostat (9) internal temperature.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106286780A (en) * 2016-10-13 2017-01-04 周德吉 Pressure compensator and the method being compensated device whether leakage of oil for detection
CN106441842A (en) * 2016-09-14 2017-02-22 常州大学 Device for measuring high-temperature high-pressure micro steam leakage
CN106768709A (en) * 2017-02-28 2017-05-31 清华大学 The experimental technique of same pressure differential lower pumping seal quantity of gas leakage corresponding with inflation
CN106979708A (en) * 2016-05-18 2017-07-25 镇江飞利达电站设备有限公司 A kind of double tubesheet steam heater with anti-leak detection function

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CN101793585A (en) * 2010-04-04 2010-08-04 苏州宝骅机械技术有限公司 Device and method for detecting sealing property of sealing element
CN101799349A (en) * 2010-04-07 2010-08-11 苏州宝骅机械技术有限公司 Device and method for detecting sealing property of sealing component
CN203629755U (en) * 2013-12-31 2014-06-04 苏州宝骅机械技术有限公司 A quantitative leakage detection apparatus for a pressure system

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Publication number Priority date Publication date Assignee Title
CN106979708A (en) * 2016-05-18 2017-07-25 镇江飞利达电站设备有限公司 A kind of double tubesheet steam heater with anti-leak detection function
CN106441842A (en) * 2016-09-14 2017-02-22 常州大学 Device for measuring high-temperature high-pressure micro steam leakage
CN106286780A (en) * 2016-10-13 2017-01-04 周德吉 Pressure compensator and the method being compensated device whether leakage of oil for detection
CN106768709A (en) * 2017-02-28 2017-05-31 清华大学 The experimental technique of same pressure differential lower pumping seal quantity of gas leakage corresponding with inflation

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Address after: Shuangfeng town Taicang city Suzhou City, Jiangsu province 215415 rich economic development zone

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