• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for the detection of leaks (14) of an essentially dense surface (1), such as a roof surface, whereby a compressed gas mixture, which contains at least one tracer gas and at least one distributor gas, is applied to a first side (13) Cover layer (11) of the surface (1) to be checked for leaks and tracer gas emerging with a detector (3) on a second side (17) of the cover layer (11) is detected with at least one detector (3) and a detection arrangement for the like. The task is to enable an improved adjustability of the pressure of the gas mixture. This is achieved by first mixing the distributor gas and the tracer gas in a mixing arrangement (4) and then compressing the gas mixture with a compressor (5), and in that the distributor gas is air and is drawn from the environment before mixing with the tracer gas , or that the distributor gas and the tracer gas are mixed first and then the gas mixture is compressed and that the distributor gas is recirculated air from the environment.
    公开号:AT521737A1
    申请号:T50891/2018
    申请日:2018-10-11
    公开日:2020-04-15
    发明作者:Paul Pagitsch Ing
    申请人:Paul Pagitsch Ing；
    IPC主号:
    专利说明:

    The invention relates to a method for the detection of leaks in an essentially dense surface, such as a roof surface, whereby a compressed gas mixture, which contains at least one tracer gas and at least one distributor gas, is brought onto a first side of a cover layer of the surface to be checked for leaks, and tracer gas emerging with a detector on a second side of the cover layer is detected with at least one detector. Furthermore, it relates to a detection arrangement for the detection of leaks in an essentially dense surface, such as a roof surface, the detection arrangement comprising a compressor and a mixing arrangement for mixing at least one distributor gas with at least one tracer gas and at least one of them towards a first side for leaks Checking cover layer of the surface leading line system for directing the gas mixture, and at least one detector for detecting the tracer gas.
    Such surfaces usually have several layers, at least one layer, the top layer, being water and gas tight. Due to external influences and aging, leaks such as cracks or holes can occur. This is a major problem, especially with large areas such as flat roofs or other covers, as moisture can penetrate the system and cause damage.
    US Pat. No. 5,335,536 A describes a method in which flue gas is produced and is brought onto an underside of a cover layer of a roof structure. If this cover layer has leaks, then the flue gas occurs there, which is visually striking and so the leak can be detected with the eye. However, this method has some problems, for example the difficult perception when little smoke escapes, especially in stronger wind conditions. For this purpose, solid particles are brought into the layer under the cover layer by the smoke, which can be disadvantageous.
    No. 4,748,847 A describes an alternative method in which a tracer gas which can be easily detected by a detector is mixed with a distributor gas in order to increase the gas volume. The distributor gas acts as a means of distribution and transport for the tracer gas. In order to improve the process, the gas mixture is brought to the underside of the cover layer with increased pressure. The gas mixture is usually in a transport container
    2/19 pre-mixed and compressed like a gas bottle. Compressed air is used as the distribution gas. This is disadvantageous, since the pressure of the gas mixture cannot be easily adjusted by combining the gases of different pressures, and the pressure is limited by the pressure prevailing in the transport container of the tracer gas. Due to the poor adjustability of the pressure of the gas mixture, a limit can be exceeded at which the surface suffers damage. If, for example, the leak is small and the resistance for the gas mixture is therefore high, working at too high a pressure can lead to an additional increase in the leak. However, if the pressure is too low, the amount of tracer gas escaping is too small to be detected with sufficient certainty. If the mixture or the pressure of the distributor gas is poorly regulated, the mixing ratios can also fluctuate, which can lead to poor detection or excessive consumption of the tracer gas. In addition, temperature differences between the gases during mixing can cause an additional pressure change.
    The object of the invention is therefore to provide a method and a detection arrangement which enables the pressure gas of the gas mixture to be adjusted more easily.
    This object is achieved in that the distributor gas and the tracer gas are first mixed and then the gas mixture is compressed.
    It is also solved in that the mixing arrangement is connected to the compressor and supplies it with the gas mixture.
    By mixing the distributor gas before a common compression, the pressure at which the gas mixture is made available can be set precisely. This can prevent excessive pressures from occurring. The ratio of the gases can be set precisely before compression.
    The mixing arrangement can be a unit separate from the compressor. However, it can also be provided that these elements are carried out together, in any case it is important that the mixing takes place before the actual compression.
    3/19
    It is particularly advantageous if the compression takes place directly before the gas mixture is guided onto the first side of the cover layer. In contrast to the previously filled, compressed and transported gas mixture to the surface, the heat of the gas mixture resulting from the compression can facilitate the distribution of the gas mixture along the first side. In addition, only as much gas can be compressed as is actually necessary. This avoids unnecessary storage and transport as well as the associated loss of gas mixture. “Directly before the tour” means that the gas mixture is compressed and used within a maximum of a few hours and preferably on site in the area of the surface. It can make sense to switch a gas tank between the compression and the introduction for short retention times, which can store the compressed gas mixture for a short time.
    To mix the gases, it is usually only necessary to conduct the gases in a suitable ratio to one another. Whirling or active mixing is generally not necessary, but suitable means can be provided for this.
    As a rule, particularly in the case of flat roofs, the first side is the underside of the cover layer, while the second side is the top side of the cover layer. Therefore, the gas mixture is usually brought to the first side, where it can be distributed in the gas-permeable layer underneath. If the cover layer has a leak, the gas mixture escapes there on the second side. A detector, which is located on the second side, can detect the exiting tracer gas, as a result of which the location of the leak is achieved. Often there is another permeable layer on the second side, possibly more of such layers, on the second side. However, this does not interfere because the gas can penetrate it, so the detector can be moved above this further permeable layer.
    It is particularly advantageous if the detector is relatively small in relation to the surface and is moved on the second side of the surface to detect the tracer gas. This makes detection possible in a particularly cost-effective manner and without high material costs. The detector can be moved over the second side and the entire second side can be scanned continuously. This eliminates the need for large detectors, usually with one
    4/19
    Detection area on which gas can be detected. It is meant by relatively small that this detection area makes up a fraction of the dense area to be examined, for example a tenth or even less. For example, detectors with areas from a few square centimeters to a few square decimeters can be used to investigate areas that are several square meters, possibly up to hundreds of square meters. If the area size increases, several detectors can be used simultaneously and moved across the area.
    It can further be provided that the gas mixture is brought to the first side of the cover layer via an opening. This opening can be opened, for example drilled, directly on the first side before the gas mixture is directed. This is particularly advantageous in the case of surfaces whose cover layer is essentially tightly connected to other dense layers on all sides and edges, or whose first side is otherwise difficult to access. After the localization has ended, it should be closed again in most cases in order to make the cover layer tight again at this point. In such areas, the method described is particularly advantageous since the number of openings to be opened can be minimized by the improved pressure regulation.
    It is particularly advantageous if the opening is provided with a nozzle for connection to a line system before the gas mixture is introduced. This allows the opening to be used repeatedly. This is also achieved if the line system has a coupling unit for connection to a connecting piece of an opening of the cover layer leading to the first side of the cover layer. This light type of connection enables repeated connection and makes it easier to reposition when using multiple openings with sockets.
    In a preferred embodiment it is provided that the distribution gas is air and is preferably obtained from the environment before being mixed with the tracer gas. As a result, the distributor gas can be removed from the circulating air and does not have to be transported to the surface.
    It is also advantageous if the tracer gas is a mixed gas containing at least nitrogen and hydrogen. These gases are easy to detect and spread
    5/19 easily in permeable layers of the surface. They are inexpensive, non-toxic and environmentally friendly.
    It is advantageous if the pressure of the compressed gas mixture can be adjusted via an adjusting device, or if the detection arrangement has an adjusting device for adjusting the pressure of the gas mixture. This makes it easy to adjust the pressure.
    The adjusting device can lower the pressure of the compressed gas mixture provided by the compressor if required, or can be directly connected to the regulation of the compressor. This enables the compressor to set the desired pressure directly. It is particularly important that the compressed gas mixture is present at the outlet of the compressor.
    Furthermore, it can be advantageous if the detection arrangement has a measuring device for measuring the resistance to influence of the gas mixture in the region of the opening. This easily measures the resistance to the gas mixture when it is distributed on the first side. It is particularly important because this resistance is decisive for the pressure at which damage to the surface can occur, but it depends on many factors and is therefore difficult to predict. The measured resistance should be as little as possible dependent on the properties of the pipe system or the opening, which is why the measurement in the area of the opening is useful. In the area of the opening, this means that the resistance for the gas mixture on its way from the measuring device to the passage after the opening is either insignificant or is known in order to subtract it from the measured value. The measuring device can therefore also be arranged on the line system, provided that the measured resistance is insignificantly changed by the line system, coupling unit, connecting piece, opening and the like arranged downstream of the measuring device, or the degree of change is known and can therefore be included in the calculation will.
    It can be provided that the pressure of the gas mixture is regulated depending on the resistance of the gas mixture at the opening. This can prevent errors in the detection or damage to the surface. It can optimize the pressure to the given conditions
    6/19. This can be done by manual control by a user or automatically. It is therefore particularly advantageous if the detection arrangement has a control arrangement connected to the setting device and the measuring device. So the regulation can take place automatically or semi-automatically.
    Furthermore, it is advantageous if the gas mixture is passed over an at least partially thermally insulated and / or soundproofed line system, or if the line system is at least partially thermally insulated and / or soundproofed. This gives the gas warmed by the compression its temperature. The warm gas spreads better along the first side, which means that the inlet resistance is lower and less pressure and smaller amounts of gas mixture are required. This saves gas. The sound insulation can reduce the noise pollution of the environment and the user of the method or the arrangement.
    The present invention is explained in more detail below on the basis of the embodiment variant shown in the figures. Show it:
    1 shows a detection arrangement according to the invention in a schematic view;
    2 shows a section through a pressure hose of a line system 8;
    3 shows a longitudinal section through the pressure hose from FIG. 2.
    The illustrated embodiment of a detection arrangement according to the invention uses a method according to the invention. It has a compression unit 2 which has a mixing arrangement 4 and a compressor 5, the mixing arrangement 4 supplying the compressor 5 with a gas mixture via a connecting hose. The mixing arrangement 4 has two inlets, one inlet having a pressurized storage bottle 6 for tracer gas and a suction inlet 7 for sucking in ambient air as distributor gas. The compression unit 2 is connected via a line system 8 to a nozzle 9 of an opening 10. The connector 9 is attached close to the opening 10, wherein it has a closing valve which is closed after use is complete. The opening 10 breaks through a cover layer 11
    7/19 and a gas and water-permeable surface layer 16 arranged above it, of a surface 1 which also has further layers. A gas-permeable intermediate layer 12 is arranged below the cover layer 11, below which, in turn, other, partly dense layers or layers with a lower gas permeability are provided. The line system 8 carries the gas compressed by the compressor 5 and has at its downstream end a coupling unit 81 which is tightly connected to the nozzle 9. The compressed gas mixture thus conducted via the line system 8 and connecting piece 9 through the opening 10 and onto a first side 13 of the cover layer 11 is thus distributed along a first side 13 in the permeable intermediate layer 12. If there is a leak 14 in the cover layer 11, it can happen an outflow 15 of the gas mixture. The escaping gas can thus be detected by detection of the tracer gas by a detector 3 moved along a second side 17 of the cover layer 11. This allows the leak 14 to be located. The detector 3 is relatively small in relation to the surface 1 and has only one gas sensor system which is moved along the surface of the surface 1.
    The line system 8 has a throttle 18, by means of which the gas flow into the surface 1 can be manually limited or prevented. Downstream of the throttle 18, the line system 8 and the connector 9 are designed such that they do not offer any appreciable resistance for the gas mixture in the intended operating pressure ranges. In addition, a measuring device 19 for measuring the pressure and the amount of gas transported is arranged downstream of the throttle 18. On the basis of these parameters, one can draw conclusions about the influence resistance. This is indicated by a display and transmitted to a control arrangement 21. The control arrangement 21 is also connected to an adjusting device 20 which adjusts the compressor 5 and the mixing arrangement 4 depending on the influence resistance.
    The pressure hose shown in FIGS. 2 and 3 has a flexible sheath 32 made of thermally insulating and thermally insulating material. In the illustrated embodiment, it is an outside 3 to 6 mm thick polyester fleece layer that envelops an inner layer 31. In the present embodiment, this is an internal polyurethane hose with a wire spiral or polyvinyl chloride spiral hose with an inner diameter of 20 to
    8/19
    55mm. An outer layer 33 made of flexible plastic forms the protective outer shell of the pressure hose. At one end, the pressure hose shown has a coupling unit 37, which enables a connection to a connecting piece. In a preferred embodiment, the pressure hose has coupling units 37 of this type, which are preferably of equivalent design, at both ends in order to be able to be connected both to the connector 9 and to an outlet of the compression unit 2. The coupling unit 37 has a plastic screw connection 36, which is connected to the inner layer 31 via a hose tie 34. In addition, a shrink tube 35 can be provided for connection to the outer layer 33.
    权利要求:
    Claims (17)
    [1]
    PATENT CLAIMS
    1. A method for the detection of leaks (14) of a substantially leak-proof surface (1) such as a roof surface, whereby a compressed gas mixture, which contains at least one tracer gas and at least one distributor gas, is leak-proof towards a first side (13) Checking cover layer (11) of the surface (1) is brought and with a detector (3) on a second side (17) of the cover layer (11) emerging tracer gas is detected with at least one detector (3), characterized in that first the distributor gas and the tracer gas is mixed and then the gas mixture is compressed.
    [2]
    2. The method according to claim 1, characterized in that the detector (3) is relatively small in relation to the surface (1) and is moved on the second side (17) of the surface (1) for detecting the tracer gas.
    [3]
    3. The method according to claim 1 or 2, characterized in that the gas mixture is brought through an opening (10) of the cover layer (11) on its first side (13).
    [4]
    4. The method according to claim 3, characterized in that the opening (10) before introducing the gas mixture is provided with a nozzle (9) for connection to a line system (8).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the distributor gas is air and is preferably obtained from the environment before mixing with the tracer gas.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that the tracer gas is a mixed gas comprising at least nitrogen and hydrogen.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the pressure of the compressed gas mixture is adjustable via an adjusting device (20).
    10/19
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the pressure of the gas mixture is regulated depending on the resistance of the gas mixture at the opening (10).
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the gas mixture is passed over an at least partially thermally insulated and / or soundproofed pipe system (8).
    [10]
    10. Detection arrangement for the detection of leaky areas (14) of an essentially dense surface (1) such as a roof surface, the detection arrangement comprising a compressor (5) and a mixing arrangement (4) for mixing at least one distributor gas with at least one tracer gas and at least one , to a first side of a cover layer (11) of the surface (1) to be checked for leaks, a line system (8) for conducting the gas mixture, and at least one detector (3) for detecting the tracer gas, characterized in that the mixing arrangement ( 4) is connected to the compressor (5) and supplies it with the gas mixture.
    [11]
    11. Detection arrangement according to claim 10, characterized in that the line system (8) has a coupling unit (81) for connection to a connecting piece (9) of an opening (10) of the cover layer (11) leading to the first side (13) of the cover layer (11) ) having.
    [12]
    12. Detection arrangement according to claim 10 or 11, characterized in that the line system (8) is at least partially thermally insulated and / or soundproofed.
    [13]
    13. Detection arrangement according to one of claims 10 to 12, characterized in that the detection arrangement has an adjusting device (20) for adjusting the pressure of the gas mixture.
    [14]
    14. Detection arrangement according to one of claims 10 to 13, characterized in that the detection arrangement has a measuring device (19) for measuring the resistance to influence of the gas mixture in the region of the opening (10).
    11/19
    [15]
    15. Detection arrangement according to claim 13 and 14, characterized in that the detection arrangement has a control arrangement (21) connected to the setting device (20) and the measuring device (19).
    [16]
    16. Detection arrangement according to one of claims 10 to 15, characterized in that the distributor gas is air, preferably circulating air from the environment.
    [17]
    17. Detection arrangement according to one of claims 10 to 16, characterized in that the tracer gas is a mixed gas comprising at least nitrogen and hydrogen.
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    同族专利:
    公开号 | 公开日
    AT521737B1|2020-11-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4748847A|1987-05-26|1988-06-07|Sheahan James P|Non-electrical leak detection method|
    EP0671680A1|1994-03-10|1995-09-13|Praxair Technology, Inc.|Automatic gas blending system|
    WO2017197521A1|2016-05-18|2017-11-23|Lineriders Inc.|Apparatus and methodologies for leak detection using gas and infrared thermography|CN111877647A|2020-09-01|2020-11-03|江苏省交通技师学院|Sensing detection device for roof leakage points and detection method thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50891/2018A|AT521737B1|2018-10-11|2018-10-11|Procedure for the detection of leaks|ATA50891/2018A| AT521737B1|2018-10-11|2018-10-11|Procedure for the detection of leaks|
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