• 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:
    In order to reduce pressure pulsations in an exhaust gas sampling probe (1) during the removal of exhaust gas from the exhaust (2) of a vehicle or an internal combustion engine, a tubular exhaust gas sampling probe (1) is provided with a first, axially extending exhaust gas sampling probe section (11) and an adjoining second, axially extending exhaust gas sampling probe section (12) is provided, wherein the first exhaust gas sampling probe section (11) at a first axial end (5) of the exhaust gas sampling probe (1) is arranged and the tubular exhaust gas sampling probe (1) at the first axial end (5) is closed at the end and in the circumferential surface (6) of the first exhaust gas sampling probe section (11) is provided with at least one opening (10) which forms an inflow channel extending to the exhaust gas sampling probe (1) over the axial length (IF) of the first exhaust gas sampling probe section (11).
    公开号:AT513007A2
    申请号:T506182013
    申请日:2013-09-25
    公开日:2013-12-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    iöÄ #! [ip 2013/50618
    AV3564 AT
    Exhaust gas sampling probe
    The subject invention relates to an exhaust gas sampling probe and the use of the exhaust gas sampling probe for the removal of exhaust gas from an exhaust of a vehicle or an internal combustion engine. 5 For research and development on internal combustion engines and vehicles, the measurement of the exhaust gas particles is of particular importance. Exhaust gas sampling probes are used, with which exhaust gas is taken from the exhaust of the internal combustion engine or the vehicle. The exhaust gas is then fed via an exhaust pipe to an exhaust gas measuring device, where it can be used for a variety of measured variables, such as Emis 10 ions, particle number, particle size distribution, etc., is examined.
    It is known e.g. Exhaust gas sampling probes in the form of an open ended pipe, which is inserted into the exhaust. A spacer may be disposed on the tube to hold the probe spaced from the exhaust wall in the exhaust. The exhaust gas sampling probe is inserted axially, with the end open end forward into the exhaust pipe of the vehicle 15 and fixed, for example, with a spring clip on exhaust tail Due to the directed in the axial direction against the exhaust flow opening of the exhaust sampling probe but not only reach the end of the tailpipe relatively low pressure fluctuations but also the considerable, resulting from dynamic pressure of the pulsating flow of exhaust gas in the exhaust pressure pulsations in the exhaust gas sampling probe tube and the subsequent measuring system 20-which costly measures in the meter are required to compensate for these pressure pulsations.
    It is therefore an object of the subject invention to provide an exhaust gas sampling probe for the removal of exhaust gas from an exhaust, can be reduced with the pressure pulsations in the exhaust gas sampling probe. This object is achieved according to the invention in that the tubular exhaust gas sampling probe is designed with a first axially extending exhaust gas sampling probe section and an adjoining second axially extending exhaust gas sampling probe section, wherein the first exhaust gas sampling probe section is arranged at a first axial end of the exhaust gas sampling probe and the tubular exhaust gas sampling probe At least one opening is provided in the peripheral surface of the first exhaust gas sampling probe section, which forms an inlet channel extending over the axial length of the first exhaust gas sampling probe section to the exhaust gas sampling probe. Due to the fact that the inflow channel extends over an axial length, a determination of the pressure pulsations in the exhaust gas emission
    -1-
    [10 2013/50018
    AV-3564 AT probe, whereby pressure pulsations in AuspufFendrohr not or only weakened in the exhaust gas sampling probe, and thus in the downstream measuring instruments propagate.
    The opening may be designed as an axial slot, or a plurality of openings may be provided, which are arranged distributed axially over the first exhaust gas sampling probe section. Likewise, a plurality of openings can be arranged distributed in the circumferential direction. It is always essential here that an inflow channel extending in the axial direction through the opening (s) results for the exhaust gas sampling probe.
    In order to achieve an advantageous as isokinetic exhaust gas removal, the sum of the cross-sectional areas of all openings is equal to the flow cross-section of the exhaust gas sampling probe. Isokinetic here means that the velocity of the flow into and through the exhaust gas sampling probe does not change.
    It is particularly advantageous if the length of the first exhaust gas sampling probe section at which the openings are arranged corresponds to at least half the diameter, preferably two thirds of the diameter of the exhaust pipe in which the exhaust gas sampling probe is arranged according to operation the Ati gas sampling probe are significantly reduced if the length of the first exhaust gas sampling probe section is chosen in relation to the exhaust diameter.
    In order to reliably prevent ambient air from being sucked into the exhaust gas sampling probe, the length of the second exhaust gas sampling probe section preferably corresponds to at least five times the diameter of the exhaust gas in which the exhaust gas sampling probe is arranged in accordance with the operation.
    With a second exhaust gas sampling probe section as a double-walled pipe section, an effective temperature control of the exhaust pipe can be achieved, which can also be dispensed with elements 25 on the exhaust pipe. In this case, the axial end of the double-walled pipe section can be closed or open at the end, ie at the side directed against the exhaust gas flow when used. At the closed end, a heat insulation in the form of an insulating air cushion forms and at the open end flows hot exhaust gas through the double-walled section, whereby the exhaust pipe is tem-30 periert.
    However, the filling of the double-walled pipe section with exhaust gas can also be advantageously carried out through many small openings, which are arranged in the outer peripheral surface of the double-walled pipe section, resulting in a closer described below -2- tPrinted: 26 ^ 39-201 $
    plf: 2Ö1 ^ 50618 AV-3564 AT size-selective particle filter results and a relatively clean exhaust gas, largely freed from larger particles, enters the double-walled pipe section.
    By a spacer on the exhaust gas sampling probe is achieved that the exhaust gas sampling probe is arranged in the exhaust at a radial distance, thereby preventing that 5 any condensate collecting in the exhaust is sucked into the exhaust gas sampling probe.
    Preferably, the exhaust gas sampling probe is connected via an exhaust pipe or directly to an exhaust gas conditioning device. In particular, with direct arrangement of the exhaust gas sampling probe on an exhaust gas conditioning device, or in a very short gas line 10, can be dispensed with a possible required heating an interposed exhaust pipe, which significantly reduces the cost of the measuring system.
    By means of a curved exhaust sampling probe in front of the exhaust conditioning means, downstream components, such as e.g. an exhaust gas conditioning, advantageously from 15 the hot, chemically aggressive exhaust gas jet are kept.
    The subject invention will be explained in more detail below with reference to Figures 1 to 5, which show by way of example, schematically and not by way of limitation advantageous embodiments of the invention. It shows
    1 exhaust gas sampling probe according to the invention in an exhaust, 20 Fig.2 and 3 versions of the exhaust gas sampling probe with double-walled Abgasent probe probe section,
    4 shows a block diagram of an exhaust gas measuring device connected to the exhaust gas sampling probe and
    5 shows an embodiment of a connected to the exhaust gas sampling probe exhaust 25 conditioning.
    In FIG. 1, a tubular exhaust gas sampling probe 1 according to the invention is arranged in an exhaust tailpipe of an exhaust 2. For this purpose, the exhaust gas sampling probe 1 is introduced axially into the exhaust 2, here into the exhaust pipe, and by means of a fastening unit 3, here e.g. in the form of a spring clamp attached to the exhaust gas sampling probe 1, fixed to the exhaust pipe 2 30. The exhaust gas sampling probe 1 is preferably made of stainless steel in order to withstand the chemically aggressive exhaust gas constituents and to prevent excessive cooling of the exhaust gas in the exhaust gas sampling probe 1. The exhaust gas withdrawn with the exhaust gas sampling probe 1 is supplied via an exhaust gas line 7 connected to the exhaust gas sampling probe 1 to an exhaust gas measuring device 8 In or after the exhaust gas measuring device -3- ^ rinted: 26-09-2013 1
    AV-3564 AT 8 is preferably a mammal pump 9 (indicated in Figure 1) arranged to suck exhaust from the exhaust 2 through the exhaust gas sampling probe 1.
    The tube cross-section of the exhaust sampling probe 1 may be circular, but may also take other forms which are not prone to particulate contamination, e.g. oval, rectangular or 5 polygonal with no sharp corners.
    At the arranged in the exhaust 2, the exhaust gas flow facing axial end 5 of the exhaust sampling probe 1, a spacer 4 is advantageously provided with which the exhaust gas sampling probe 1 is kept spaced from the Rohiwand of the exhaust 2, to prevent any accumulating in the exhaust 2 condensate in the exhaust sampling 10 probe 1 passes. However, the spacer 4 may also be attached to another location of the exhaust sampling probe 1, e.g. shown in Fig.2.
    Exhaust gas sampling probe 1 is preferably curved in the area that is located outside of exhaust 2 during use, which facilitates attachment to exhaust 2 and prevents downstream equipment connected to exhaust gas sampling probe 1, such as e.g. an exhaust gas conditioning device 20, directly exposed to the hot _________Ahgasstrahl siocL___________________________________________________________
    The exhaust gas sampling probe 1 is at the end arranged in the exhaust 2 axiaien end 5 closed (ie at the directed against the exhaust stream during the use of the invention Strinseite) closed. In the region of the axial end 5, at least one opening 10 is provided on the peripheral surface 6 of the exhaust gas sampling probe 1 at a first exhaust gas sampling section 1, through which an inflow channel is formed through which exhaust gas from the exhaust 2 can flow into the exhaust gas sampling probe 1. In this case, the opening 10, or the inflow channel that forms, extends essentially over the axial length IF of the first exhaust gas sampling probe section 11. Preferably, exhaust gas with the mammalian pump 9 is sucked into the exhaust gas probe 1 via the opening 10.
    The inflow channel into the exhaust gas sampling probe 1 can also be designed in the form of several distributed openings 10. As openings 10 are e.g. Provided over the circumference distributed holes, as shown in Fig.1. For example, each three lying in a cross-sectional plane, offset by 120 ° bores, wherein a plurality of such drilling arrangements are arranged axially one behind the other, here e.g. six axially successively arranged drilling arrangements, each with three holes offset by 120 °. The axially successively arranged bore arrangements can in turn by a certain angle, hierz.B. 180 °, be twisted to each other. ii§i§io | 3 uii'102013 / 506I8
    AV3564 AT
    Of course, other openings 10 and arrangements of openings 10 are conceivable, such as e.g. circumferentially distributed axial slots (as shown in Fig. 2) or circumferentially distributed slots in the circumferential direction (as shown in Fig. 3). Likewise, of course, combinations of different openings 10 are conceivable. It is essential that the 5 inflow channel to the exhaust gas sampling probe 1 is distributed over an axial length lF.
    For this purpose, it is advantageous if the sum of the areas AF of the openings 10 approximately corresponds to the flow cross-section As of the exhaust gas sampling probe 1, that is, if IAp®As, since then the most isokinetic exhaust gas removal is achieved.
    The length lF of the first exhaust gas sampling probe section 11 at the axial end 5 of the gas sampling probe 1, at which the openings 10 are arranged, is selected so that any pressure pulsations in the exhaust gas flow in the exhaust gas sampling probe 1 are as much as possible. For this purpose, the openings 10 are distributed to the exhaust gas sampling probe 1 over a certain length lF, wherein the length lF is greater than or equal to half, preferably two-thirds, of the exhaust pipe diameter D. Furthermore, it is desirable to provide a second leaching section 12 of length ls without openings 10 subsequent to the first exhaust sampling probe cut-off during use of the second exhaust pipe 2, this length being greater than or equal to five times the exhaust diameter D. , So ls £ 5D, since then it can be safely prevented that ambient air is sucked from outside the exhaust 2 in the exhaust gas sampling probe 1.
    The cross section AF, or in the case of bore »! the diameter, the openings 10, can be chosen so that a size-selective particle filter is formed. There is a known relationship between cross section AF, flow velocity in the exhaust gas sampling probe 1 (or exhaust gas mass flow) and the size of the particles in the exhaust gas flow, which are sucked through the openings 10. Thus, on the basis of the openings 10 and the resulting flow velocity (depending on the suppression in the exhaust gas sampling probe 1 and the cross section As of the exhaust gas sampling probe 1) in the exhaust gas sampling probe 1 (eg given by the mammal pump 9) a deposition characteristic can be set in the particles of a certain size in the exhaust gas can not be sucked into the exhaust gas sampling probe 1. This cutoff point is typically about 2.5pm for exhaust gas measurements, e.g. with openings 10 in the form of bores with a diameter of 1.5 mm and an exhaust gas mass flow in the exhaust gas sampling probe 1 of 5 l / min is achieved.
    In a possible advantageous embodiment of the exhaust gas sampling probe 1, the second exhaust gas sampling probe section 12, which has no openings 10, and preferably also -5- MÄiÄaii fc014.1 1102013/50618
    AV-3564 AT the possibly to the exhaust gas sampling probe 1 subsequent exhaust pipe 7, double-walled, as shown in Figure 2. The arranged in the operational use in the exhaust 2 axial end of the double-walled pipe section 13 is end-closed, so that in the double-walled pipe section 13, ie between the inside-5 the pipe and the outside pipe 14, an air cushion forms, which acts wämneisolierend and thus a Cooling of the exhaust gas in the exhaust gas sampling probe 1 or in the exhaust pipe 7 prevented or at least significantly reduced. This otherwise unnecessary heating elements for the exhaust pipe 7 are obsolete. In the double-walled pipe section 13, of course, a vacuum can be produced, which further increases the heat-insulating effect 10.
    In an alternative to this, the double-walled pipe section 13 may be open-sided at the axial end 5 facing the first exhaust gas sampling probe section 11 with opening (s) 10, as shown in FIG. This flows in the double-walled pipe section 13 between the inner pipe and the outer pipe 14 hot exhaust gas from the exhaust 15 2, whereby the exhaust gas sampling probe 1 and a possible exhaust pipe 7 are tempe Tured simultaneously. Before the exhaust gas measuring device 8, or an exhaust gas conditioning device 20, the double-walled pipe section 13 opens to the outside, to allow a flow of exhaust gas through the double-walled pipe section 13.
    The filling of the double-walled pipe section 13 with exhaust gas can, however, also be effected in the case of the end face of the double-walled pipe section 13 exclusively or in the case of an open end face, also by many small flow processes 15 occurring in the outer peripheral surface of the outer pipe 14 of the double-walled pipe section 13 As a result of the above-described effect of the deposition of large particles at the small inflow openings 15, a relatively clean exhaust gas, which is largely freed of larger particles, will enter the double-walled pipe section 13.
    The exhaust gas sampling probe 1 supplies exhaust gas for a downstream downstream exhaust gas meter 8. In front of the exhaust gas meter 8, an exhaust gas conditioning device 20 may be connected upstream. In Fig. 4, an embodiment of an exhaust gas meter 8 is schematically Darge-30 represents. The exhaust gas measuring device 8 is here designed to be dual-channel, in that the supplied exhaust gas flow in the exhaust gas measuring device 8 is directed to two parallel measuring lines 28, 29 with particle measuring devices 21, 22 arranged therein, such as e.g. Scattered light meters, opacimeters, particle counter, aerosol electrometer, etc., is divided. Of course, however, more than two measuring channels, or even a single measuring channel, may be provided. Likewise, it is conceivable to arrange two particle measuring devices 21, 42 in succession in a measuring line 28, 29, as indicated in FIG. When using several particle gauges -IllAllI | Ε014; 1 (iQaOi3 / 50618
    AV-3564 AT 21,22,42, the sensitivity of the exhaust gas meter 8 can be increased by using particle measuring devices 21,22, 42 are used with different resolutions and / or measuring ranges.
    In order to be able to easily set the volume flow through the individual exhaust gas measuring devices 8, a bypass line 24 arranged parallel to the measuring lines 28, 29 can be provided with a filter unit 23. In each of the lines, a critical orifice 25, 26, 27 may additionally be arranged, which likewise serves to regulate the volume flows in the individual lines 24, 28, 29. Downstream of the particle measuring devices 21, 22, 42, the individual lines 24, 28, 29 again merged into an outlet 31, in which io a pulsation damper 30 can be arranged. In the outlet 31 further may also be arranged the mammal pump 9. In addition, a safety valve 32 may be provided on the outlet side in order to prevent a backflow of ambient air into the measuring channels of the exhaust gas measuring device 8.
    A dilution stage 56 may also be provided in the exhaust gas conditioning device 20, in which the withdrawn exhaust gas is diluted with gas or preferably with particle-free air, as will be described in detail below with reference to FIG. Provision of the clean air required for this purpose can also be provided in the exhaust gas measuring device 8 for air conditioning, as shown by way of example in FIG. In this case, ambient air is sucked in with a dilution air pump 33, cooled in a gas cooler 34, dried in a condensate separator 35, and filtered in riter units 36, 37. The thus treated air can then be removed and fed to an exhaust gas conditioning device 20. In the dilution air line 38 may also be a pulsation damper 39 and a mass flow control device 40 may be arranged. Separate condensation water can be removed by means of a condensate pump 41 from the exhaust gas meter 8. In the exhaust conditioner 20, as shown in FIG. a preheating section 50 is provided, in which the supplied exhaust gas is pre-heated by means of heating element 51. In preheating 50 also volatile exhaust gas components are converted into the gas phase.
    Thereafter, a catalyst 52 connects, e.g. as described in AT 13 239 U1, in which volatile exhaust gas constituents are removed from the exhaust gas. The catalytic converter 52 includes an oxidation catalyst 53 in which volatile organic exhaust gas constituents are burned, and a sulfur trap 54 in which volatile silica particles are bound and thereby removed from the exhaust gas. The catalyst 52 is preferably tempered by means of a heater 55. Connected downstream of the catalytic converter 52 is a dilution stage 56 in which the purified exhaust gas stream is diluted with pure air. Here, dilution step 35 is 56, e.g. as a porous thinner, as described in EP 2 264 423 A2. Of course, other embodiments of the dilution stage 56 are conceivable, e.g. -7- fPHnted: 2) 64) 9-2013 ÜE0141 [10 ^ 13/50618
    AV 3564 AT as a rotary diluent, as described in EP 2 025 979 B1, or as a well-known dilution tunnel. An embodiment of the exhaust gas conditioning device 20 without a downstream dilution stage 56 is also conceivable.
    The exhaust gas conditioning device 20 may be connected via an exhaust pipe 7, or directly, to the exhaust gas sampling probe 1. -8th-
    权利要求:
    Claims (15)
    [1]
    1. Tubular exhaust gas sampling probe having a first, axially extending exhaust gas sampling probe section (11) and a second, axially extending exhaust gas sampling probe section (12), the first exhaust gas sampling probe section (11) at a first axial end (5) of the exhaust gas sampling probe (1) is arranged, wherein the tubular exhaust gas sampling probe (1) at the first axial end (5) is endseitig closed and in the peripheral surface (6) of the first exhaust gas sampling probe portion (11) at least an opening (10) is provided which forms an inflow channel extending over the axial length (IF) of the first exhaust gas sampling probe section (11) to the exhaust gas sampling probe (1).
    [2]
    2. Tubular exhaust gas sampling probe according to claim 1, characterized in that the opening (10) is designed as an axial slot.
    [3]
    3. Tubular exhaust gas sampling probe according to claim 1, characterized in that a plurality of openings (10) are provided, which are distributed axially over the first exhaust gas sampling probe section (11).
    [4]
    4. tubular exhaust gas sampling probe according to claim 2 or 3, characterized in that a plurality of openings (10) are arranged distributed in the circumferential direction.
    [5]
    5. Tubular exhaust gas sampling probe according to one of claims 1 to 4, characterized ge-20 indicates that the cross-sectional area (AF) of all openings (10) is substantially equal to the flow cross-section (As) of the exhaust gas sampling probe (1).
    [6]
    6. tubular exhaust gas sampling probe according to one of claims 1 to 5, characterized in that the length (lF) of the first Abgasaufnahmesondenabschnitts (11) at least half the diameter (D), preferably two thirds of the diameter (D), the 25 exhaust (2) , in which the exhaust gas sampling probe (1) is arranged according to the operation, corresponds.
    [7]
    7. tubular exhaust gas sampling probe according to one of claims 1 to 6, characterized in that the length (ls) of the second exhaust gas sampling probe portion (12) at least five times the diameter (D) of the exhaust (2), in which the exhaust gas sampling 30 de (1) is arranged according to the operation, corresponds. -9- IliidriiÖiMä §014.1: 102013/50618 AV-3564AT
    [8]
    8. tubular exhaust gas sampling probe according to claim 1, characterized in that the second exhaust gas sampling probe section (12) is designed as a double-walled pipe section (13)
    [9]
    9. Tubular exhaust gas sampling probe according to claim 8, characterized in that the first exhaust gas sampling probe section (11) facing the axial end of the double-walled pipe section (13) is closed at the end.
    [10]
    10. Tubular exhaust gas sampling probe according to claim 8, characterized in that the first exhaust gas sampling probe section (11) facing the axial end of the double-walled pipe section (13) is end face open.
    [11]
    11. Tubular exhaust gas sampling probe according to one of claims 8 to 10, characterized in that on the outer circumferential surface of the double-walled pipe section (13) a plurality of inflow openings (15) are provided.
    [12]
    12. Tubular exhaust gas sampling probe according to one of claims 1 to 10, characterized in that on the exhaust gas sampling probe (1), a spacer (4) is arranged.
    [13]
    13. tubular exhaust gas sampling probe according to one of claims 1 to 12, characterized in that the first exhaust gas sampling probe section (11) facing away from the end of the second exhaust gas sampling probe portion (12) is curved.
    [14]
    14. Tubular exhaust gas sampling probe according to one of claims 1 to 13, characterized in that the exhaust gas sampling probe (1) via an exhaust pipe (7) or directly to 20 an exhaust gas conditioning device (20) is connected.
    [15]
    15. The use of the tubular exhaust gas sampling probe according to one of claims 1 to 14 in an exhaust gas measuring system, wherein the exhaust gas sampling probe (1) exhaust from an exhaust (2) of a vehicle or an internal combustion engine is removed and an exhaust gas meter (8) is supplied. 25 -10-
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    同族专利:
    公开号 | 公开日
    AT513007A3|2014-08-15|
    AT513007B1|2017-03-15|
    WO2015044256A1|2015-04-02|
    DE112014004412A5|2016-06-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102015108586A1|2014-06-20|2015-12-24|Avl List Gmbh|Sampling device|US3382721A|1965-10-04|1968-05-14|Clayton Manufacturing Co|Probe for collecting exhaust gas|
    US3459047A|1967-06-21|1969-08-05|United States Steel Corp|Gas sampling probe|
    JP3531859B2|1998-09-28|2004-05-31|株式会社デンソー|Gas sensor|
    DE10230714A1|2002-07-08|2004-02-05|Analysenmeßtechnik Bernath Atomic GmbH & Co KG|Gas withdrawal probe, preventing precipitation of condensible components between analyzer and sample source point, comprises evacuated double wall construction jacket to provide thermal insulation|
    DE102006006112A1|2006-02-10|2007-08-16|Robert Bosch Gmbh|particle sensor|
    DE102010046851A1|2010-09-29|2012-03-29|Scania Cv Ab|Detecting device for use in exhaust gas system for detecting nitrogen oxide contents in gas mixture from diesel combustion engine, has wall guiding gas stream to outlet opening after passing gas to sensor that is arranged in hollow body|WO2019155111A1|2018-02-09|2019-08-15|Wärtsilä Finland Oy|NOx MEASUREMENT DEVICE|
    DE102019102954A1|2019-02-06|2020-08-06|Dr. Födisch Umweltmesstechnik AG|DEVICE AND METHOD FOR THE EXTRACTIVE CONTINUOUS MEASUREMENT OF PARTICLES|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50618/2013A|AT513007B1|2013-09-25|2013-09-25|Exhaust gas sampling probe|ATA50618/2013A| AT513007B1|2013-09-25|2013-09-25|Exhaust gas sampling probe|
    DE112014004412.1T| DE112014004412A5|2013-09-25|2014-09-25|Exhaust gas sampling probe|
    PCT/EP2014/070467| WO2015044256A1|2013-09-25|2014-09-25|Exhaust gas removal probe|
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