CN101408466B - Method and device for detecting leakage of shell type heat exchanger - Google Patents
Method and device for detecting leakage of shell type heat exchanger Download PDFInfo
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- CN101408466B CN101408466B CN2008101742164A CN200810174216A CN101408466B CN 101408466 B CN101408466 B CN 101408466B CN 2008101742164 A CN2008101742164 A CN 2008101742164A CN 200810174216 A CN200810174216 A CN 200810174216A CN 101408466 B CN101408466 B CN 101408466B
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Abstract
The invention relates to a detection method and a device thereof, in particular to a leak detection method for a shell-and-tube heat exchanger and a device thereof. The detection device comprises a helium mass spectrometer leak detector and a vacuum pump, and is characterized in that an air inlet tube is arranged on an air intake hood which is hermetically connected with one end of the shell-and-tube heat exchanger, an exhaust hood is hermetically arranged on the other end of the shell-and-tube heat exchanger and is equipped with an exhaust tube on the exhaust hood, a vacuum pump clearance tube is arranged on the outer shell of the shell-and-tube heat exchanger, and an air inlet of the helium mass spectrometer leak detector is communicated with the outlet of the vacuum pump. The detection device can lock the leak situations of all the detected shells and tubes in the air intake hood and the exhaust hood which are respectively arranged on the shell-and-tube heat exchanger at one time, and can accurately determine the leaking shells and tubes by replacing hoods of different specifications, thus greatly enhancing the detection efficiency and lightening the labor intensity. Meanwhile, the helium mass spectrometer leak detector is used, thus enhancing the detection precision of the device and eliminates the external interference.
Description
Technical field
The present invention relates to the leakage detection method and the pick-up unit of a kind of detection method and device, particularly shell-and-tube heat exchanger.
Background technology
The structure of shell-and-tube heat exchanger mainly is by the shrouding at shell, shell two ends and installation tubulation in the enclosure, and the periphery at tubulation two ends links to each other with the shrouding sealing.Feed a kind of medium in the tubulation, in the cavity that between shell and tubulation, forms, feed another kind of medium, carry out work by the heat interchange between the two media.If leaking appears in tubulation in the use, will influence production.The main method that detects the tubulation leakage at present has candlelight method and air-compressing.It is by after tubulation one end is sealed that the fire method detects, feed pressurized air in the enclosure or vacuumize, then with candle flame one by one near the mouth of pipe of tubulation, if leakage is arranged in the pipe, candle flame will be attracted to the mouth of pipe or be blown to the mouth of pipe outside, thereby find the copper pipe of leakage.The air-compressing detection is the end sealing with tubulation, and the other end blocks up tight with the middle rubber stopper that has steam guiding tube, and this tubulation is exactly an airtight container.By wireway pressurized air is fed in the tubulation, detect the tubulation internal pressure by the tensimeter that is connected with wireway, if tubulation has leakage, tensimeter pressure also decreases, and shows this tubulation leakage.All there is certain defective in above-mentioned two kinds of detection methods.The candlelight method is subjected to extraneous interference ratio bigger, and there is certain degree of difficulty in the judgement of flame, and since the quantity of tubulation more for a long time, labour intensity is big.Though air-compressing has overcome extraneous interference, but the rubber stopper of its sealing usefulness need bear bigger compressed air pressure, and its tightness is doubtful, these all can impact testing result, and when tubulation has very little leakage, can't detect, this detection simultaneously also is that every tubulation must be examined, and also has the big problem of labour intensity.
And helium mass spectrum leak detection method at present commonly used is mainly used in the leakage detection of turbine vacuum system, to the tubulation leak detection of shell-and-tube heat exchanger, because structural problem also can't be used.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, the leakage detection method and the device of the high shell-and-tube heat exchanger of a kind of accuracy of detection and detection efficiency is provided.
For achieving the above object, technical scheme of the present invention is: the method for utilizing the leak detecting device of shell-and-tube heat exchanger to carry out leak test, it is with in the tubulation in the helium access tube shell heat exchanger, the vacuum pump that utilization links to each other with the shell-and-tube heat exchanger shell vacuumizes shell and the formed cavity of tubulation outer wall, by helium mass spectrometer leak detector the air-flow of vacuum pump outlet is carried out helium and detect, determine whether the tubulation that feeds helium leaks.
The leak detecting device of shell-and-tube heat exchanger, comprise helium mass spectrometer leak detector, vacuum pump, it is characterized in that draft tube is installed on the airscoop shroud, airscoop shroud links to each other with the sealing of shell-and-tube heat exchanger one end, the hood sealing is installed in the other end of shell-and-tube heat exchanger, gas outlet is installed on hood, and on the shell of shell-and-tube heat exchanger, the air intake opening of helium mass spectrometer leak detector is connected with vacuum pump outlet vacuum pump by piping erection.
Seal face at above-mentioned airscoop shroud and hood is equipped with sealing strip.
In above-mentioned airscoop shroud, fan is installed.
On the gas outlet on the above-mentioned hood, exhaust fan is installed.
Pick-up unit of the present invention and detection method are to utilize helium and helium mass spectrometer leak detector that the tubulation in the shell-and-tube heat exchanger is detected, to determine the leakage of tubulation.This device is airscoop shroud and the air leaving cover that is installed in the shell-and-tube heat exchanger two ends by sealing, the leakage situation of all the tested tubulations in just can disposable locking inlet, outlet cover, and by change different size into and out of gas hood, dwindle lock-in range gradually, until the tubulation of determining to reveal, improve detection efficiency greatly, reduced labour intensity.Used helium mass spectrometer leak detector simultaneously, in case there is tubulation to reveal, helium will enter in the housing, enters helium mass spectrometer leak detector by vacuum pump, because the accuracy of detection of helium mass spectrometer leak detector is very high, has improved this Device Testing precision, has got rid of external interference.
Description of drawings
Accompanying drawing 1 is utilization structure synoptic diagram of the present invention;
Accompanying drawing 2 is the mounting structure synoptic diagram of hood of the present invention.
Embodiment
This monitoring method is with in the tubulation in the helium access tube shell heat exchanger, the vacuum pump that utilization links to each other with the shell-and-tube heat exchanger shell vacuumizes shell and the formed cavity of tubulation outer wall, by helium mass spectrometer leak detector the air-flow of vacuum pump outlet is carried out helium then and detect, determine whether the tubulation that feeds helium leaks.Concrete pick-up unit as shown in Figure 1, 2, the left end shrouding 11 of the end face of airscoop shroud 2 and shell-and-tube heat exchanger is tightly connected by sealing strip 12, and fan 3 is installed in airscoop shroud, draft tube 1 is installed on the airscoop shroud; The right-hand member shrouding of the end face of hood 9 and shell-and-tube heat exchanger is tightly connected by sealing strip, is installed on the pipeline of the gas outlet on the hood exhaust fan 10 is installed; In shell 4 lower ends of shell-and-tube heat exchanger, threading a pipe 6 is equipped with vacuum pump 7, and the air intake opening of helium mass spectrometer leak detector 8 is connected with vacuum pump outlet.During detection, at first airscoop shroud and hood are distinguished relative fixed on the shrouding at shell-and-tube heat exchanger two ends, fixed form can adopt the mode of magnet absorption.In tubulation 5, send into helium by draft tube then, helium is evenly distributed in the tubulation of airscoop shroud locking, then slowly by discharging by fan.When leaking, helium enters helium mass spectrometer leak detector by vacuum pump, just can determine that the tubulation that airscoop shroud covers has leakage, is changing the little inlet and outlet cover of area then, repeats said process, can determine that finally which tubulation leaks.
Claims (5)
1. the method for utilizing the leak detecting device of shell-and-tube heat exchanger to carry out leak test, it is with in the tubulation in the helium access tube shell heat exchanger, the vacuum pump that utilization links to each other with the shell-and-tube heat exchanger shell vacuumizes shell and the formed cavity of tubulation outer wall, by helium mass spectrometer leak detector the air-flow of vacuum pump outlet is carried out helium and detect, determine whether the tubulation that feeds helium leaks.
2. the leak detecting device of shell-and-tube heat exchanger, comprise helium mass spectrometer leak detector, vacuum pump, it is characterized in that draft tube (1) is installed on the airscoop shroud (2), airscoop shroud links to each other with the sealing of shell-and-tube heat exchanger (4) one ends, hood (9) sealing is installed in the other end of shell-and-tube heat exchanger, gas outlet is installed on hood, and on the shell of shell-and-tube heat exchanger, the air intake opening of helium mass spectrometer leak detector (8) is connected with vacuum pump outlet vacuum pump (7) by piping erection.
3. the leak detecting device of shell-and-tube heat exchanger according to claim 2 is characterized in that at the seal face of above-mentioned airscoop shroud (2) and hood (9) sealing strip (12) being installed.
4. according to the leak detecting device of claim 2 or 3 described shell-and-tube heat exchangers, it is characterized in that in above-mentioned airscoop shroud (2), being equipped with fan (3).
5. the leak detecting device of shell-and-tube heat exchanger according to claim 4 is characterized in that being equipped with exhaust fan (10) on the gas outlet on the above-mentioned hood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101742164A CN101408466B (en) | 2008-11-08 | 2008-11-08 | Method and device for detecting leakage of shell type heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101742164A CN101408466B (en) | 2008-11-08 | 2008-11-08 | Method and device for detecting leakage of shell type heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN101408466A CN101408466A (en) | 2009-04-15 |
| CN101408466B true CN101408466B (en) | 2010-06-02 |
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| CN2008101742164A Expired - Fee Related CN101408466B (en) | 2008-11-08 | 2008-11-08 | Method and device for detecting leakage of shell type heat exchanger |
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| CN110836753A (en) * | 2019-11-20 | 2020-02-25 | 北京丰凯换热器有限责任公司 | Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides |
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| CN101408466A (en) | 2009-04-15 |
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