• 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:
    Diesel combustión gas sensor. This sensor comprises: a sensor element (2) with a sensor zone (21), a housing (4) that supports said sensor element (2); an internal protective cover (31) covering the sensor zone (21) and containing holes (312, 314) for circulating the gas to be measured; an intermediate protective cover (32) concentrically covering said inner protective cover (31) and containing holes (322, 324) for circulating the gas to be measured; and an outer protective cover (33) concentrically covering said intermediate protective cover (32). The inner protective covers (31) and intermediate covers (32) each comprise three tabs (316, 326) alternately engaged in six openings (337) of the outer protective cover (33). Said flanges are joined by a circumferential weld (5) to a peripheral rib of the casing (4) where said flanges (316, 326) and said openings (337) are housed. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2541081A1
    申请号:ES201530455
    申请日:2015-04-07
    公开日:2015-07-15
    发明作者:Francisco RAMOS PÉREZ；Jesús GARCÍA CANTÓN；Koen GARCÍA VAN EST；Yesli SILVERA GRAU
    申请人:FRANCISCO ALBERO S A U；FRANCISCO ALBERO SAU；
    IPC主号:
    专利说明:

    P201530455
    04-07-2015 DESCRIPTION
    Diesel combustion gas sensor.
    5 Object of the invention
    The object of the invention is a diesel combustion gas sensor provided with a suitable protector to cover the sensor part exposed to a gas to be measured, in particular, of the exhaust gas of diesel engines. Field of the Invention
    This invention is applicable in the manufacture of exhaust gas sensors for 15 diesel engines. Background of the invention
    The exhaust gas sensors of internal combustion engines have been
    20 reported extensively. An example can be seen in US4647364. Located in the exhaust pipe, these sensors are used to control the air / fuel mixture in order to establish a mixture as close to the stoichiometric ratio as possible by measuring the oxygen content in the exhaust gas, so that harmful emissions are minimized thanks to
    25 optimized combustion.
    Exhaust gas sensors are generally provided with a thimble-shaped shield to cover and protect the sensor part of the ceramic electrolyte that is exposed to the gas being measured. They are provided with openings that allow the gas to be measured to circulate through them and reach said sensor zone in a controlled manner. Most current protectors have a concentric double deck structure with different holes through which the gas to be measured enters and leaves. This double structure avoids the thermal shock that the water droplets caused by the flow of gas that form when, during the heating phase, the water vapor generated by the combustion of the combustion could produce to the ceramic electrolyte
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    Engine condenses on the cold surfaces of the exhaust system. Water droplets remain retained on the lateral surface of the inner cylinder and evaporate slowly thanks to the rising temperature of the exhaust gas as the engine warms up.
    5
    An example of a double protector is shown in US5762771. This protector is formed by an internal thimble-shaped cover that covers the ceramic electrolyte in close proximity and an external, thimble-shaped cover that wraps the first one. Both covers are fixed to a housing shaped
    10 hexagonal cylinder in which the ceramic electrolyte is axially held. The opening area of both covers is divided into tabs that fit between them interspersed. These tabs have the bent end out, allowing the covers to be fixed to the housing by a riveting operation.
    15 This structure is simple to install and adequately protects the ceramic electrolyte from the exhaust gas of gasoline engines, but when it is placed at the exhaust of a diesel engine, it does not prevent the ceramic electrolyte from being covered by soot expelled in the combustion of diesel or that the holes of the protector themselves are blocked by soot if they try to do more
    20 small On the other hand, the tabs of the covers of the previous patent are joined to the housing by means of a riveting process, which produces greater sealing and fastening defects than those that would occur through a welding joint.
    25 Soot has multiple adverse effects on gas sensors, especially in their durability, so it is vital that they are protected for this purpose when they are located in a diesel combustion environment. US7810375 and US7390385 show a protector in which a third cover is included, thus achieving greater protection against soot without affecting the
    30 sensor dynamics.
    The added cover hinders the path of arrival of the soot to the ceramic electrolyte, which in turn allows increasing the diameter of the gas inlet and outlet holes to prevent them from being clogged by the soot. The particles that pass through the 35 holes of the two outer covers are burned when they come into contact with the
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    04-07-2015
    internal cover, which quickly heats up to a temperature sufficient for the combustion process of soot particles due to its greater proximity to the heater integrated in the sensor element. In these patents, the inner cover is mounted axially inside the housing; the area of the opening of the cover 5 widens conically and said area rests on the wall of the housing, being fixed thanks to the pressure exerted on them by the strongly compressed sealing element inside the housing. This type of protector can be observed, for example, in the BOSCH LSU4.9D gas sensor. The disadvantage of this type of protector with respect to that reported in US5762771 is the lower simplicity of
    10 assembly and the corresponding increase in production cost. Description of the invention
    The invention relates to a diesel combustion gas sensor and specifically
    15 in the configuration of a sensor element protector; whose protector consists of three concentric covers formed by metal cylinders, which rest on the sensor housing and protect the area of the ceramic electrolyte sensitive to the gas to be measured.
    The inner cover has three equidistant tabs folded outward in the area
    20 of the opening and the intermediate cover has three others. The outer cover has six tabs, not necessarily bent outwards, which form six angularly equidistant spaces in which the tabs of the inner and intermediate covers fit. In this way, the three covers can be fixed and sealed together to the housing by welding and / or riveting in the same process
    25 productive oxygen sensor.
    So that the covers do not swing when supporting their tabs in the housing, a minimum of three angularly equidistant tabs on each cover are necessary, but their size would be too small in the case of having four or more
    30 tabs on the inner and intermediate covers. It is for this reason that the appropriate amount of eyelashes is three on the inner and intermediate cover, and six on the outer cover.
    Because today the laser welding process has become widely popular 35 thanks to its low cost and adequate performance, it is preferable
    P201530455
    04-07-2015
    the laser welding that the riveting, since the defects of tightness are reduced and the subjection between the housing and the protector is improved.
    So that the tabs of the inner protective cover are not too long and to specify the positioning between the inner cover and the intermediate cover, the inner cover cylinder has a widening in the part near the opening, so that it is adjusted without slack with the intermediate cover. Slits in the contact faces of both covers fit inside each other, so that they establish the equidistant angular position of the eyelashes.
    With the invention presented here, a gas sensor with a reliable protector against thermal shock due to contact with water and against soot contamination of diesel engine exhaust gases is offered, while achieving great simplicity of assembly , low production costs and reduction of defects with respect to the protectors reported in the state of the art.
    The above features and advantages of the present invention will become more apparent from the following description, taking it in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example. Description of the figures
    Figure 1 is an isometric view of the diesel combustion gas sensor, with the protective covers sectioned.
    Figure 2a is an isometric view and Figure 2b is an elevation view of the inner protective cover.
    Figure 3a is an isometric view and Figure 3b is an elevation view of the intermediate protective cover.
    Figure 4 is an isometric view of the outer protective cover.
    P201530455
    04-07-2015
    Figure 5 is a sectional side view of the protective covers and the gas sensor housing. Detailed description of the invention
    5
    The diesel combustion gas sensor is described below according to a preferred embodiment of the present invention.
    As shown in Figure 1, the gas sensor (1) comprises a sensor element 10 (2), a protector (3), sectioned in this figure, arranged to cover the sensor zone
    (21) of the sensor element (2) and a housing (4) with a cylindrical and hexagonal shape to which the protector (3) is welded concentrically (welding not shown in this figure). The housing (4) simultaneously houses the sensor element (2) so that it seals tightly and insulates the connection zone (22) of the sensor zone (21) where
    15 flows the gas to be measured.
    The protection cover (3) comprises an internal protective cover (31) covering the sensor zone (21), an intermediate protective cover (32) covering the internal protective cover (31), and an external protective cover (33) located
    20 around the intermediate protective cover (32).
    The inner protective cover (31) is a metal cylinder closed at one end, as shown in Figures 2a and 2b. On the cylindrical face (311) it has a plurality of gas inlet holes (312) and on the flat face (313) it has
    25 a plurality of gas outlet holes (314).
    The intermediate protective cover (32) is also a metal cylinder closed at one end, as shown in Figures 3a and 3b. On the cylindrical face (321) it has a plurality of gas inlet holes (322) not aligned with the
    30 gas inlet holes (312) of the internal protective cover (31). On the flat face (323) of the end has a gas outlet hole (324) located in the center.
    To specify the concentric position of the inner cover (31) inside the intermediate cover (32), the cylinder of the first has a widened section (317) in a shape
    35 that fits snugly inside the intermediate cover (32). To establish
    P201530455
    04-07-2015
    the angular position equidistant from the tabs of the two covers (31) and (32), there are slits (315) and (325) in the contact walls of both covers
    (31) and (32), so that the slit (325) fits inside the slit (315) only
    when both covers (31) and (32) are in the appropriate angular orientation 5.
    The outer protective cover (33) is also a metal cylinder, but in this preferred embodiment of the invention, it has no closed end or holes in the wall, as shown in Figure 4. The gas enters the shield a through the
    10 equidistant separation (331) (marked in Figure 5) that exists between the outer protective cover (33) and the intermediate protective cover (32).
    So that said protective covers (31), (32) and (33) can be fixed and sealed to the housing (4) contain tabs (316, 326, 336) located in the adjacent area
    15 to the housing (4).
    The tabs (316) of the inner cover (31) are bent outwardly and are intercalated and angularly equidistant to the tabs (326) also bent outwardly of the intermediate cover (32).
    twenty
    The six tabs (336) of the outer protective cover (33) form six openings
    (337) angularly equidistant, where the tabs (316, 326) of the respective covers (31) and (32) alternately fit.
    25 The tabs (316, 326, 336) of the protective covers (31), (32) and (33) rest on the surface (41) of the housing (4). On the perimeter of the surface (41) there is a circular rib (42) in which the tabs (316, 326, 336) fit concentrically inside and to which they are welded perimetrically in a gas-tight manner. The circumferential weld bead (5), preferably produced by welding
    30 laser, is shown in Figure 5.
    权利要求:
    Claims (3)
    [1]

    1. Diesel combustion gas sensor comprising a sensor element (2) having a sensor zone (21) suitable for measuring a predetermined component of a gas to be measured, a housing (4) holding said sensor element ( 2) and a protector (3) that joins said housing (4) and that surrounds said sensor zone (21) of said sensor element (2), characterized in that it comprises: an internal protective cover (31) formed by a cylinder metal closed at one end, covering the sensor zone (21) of the sensor element (2) and containing holes (312, 314) that allow the circulation of the gas to be measured inside, - an intermediate protective cover (32 ) formed by a metal cylinder closed at one end, which concentrically covers said internal protective cover (31) and contains holes (322, 324) that allow the circulation of the gas to be measured inside, - an external protective cover ( 33) formed by a metal cylinder, which
    concentrically covers said intermediate protective cover (32), where the cylindrical wall of said internal protective cover (31) has a widened section (317) in the area of the opening which is tightly fitted to the cylindrical wall of said intermediate protective cover ( 32). wherein said internal protective cover (31) and said intermediate protective cover (32) each comprise three tabs (316, 326) angularly equidistant and bent outwardly at the open end, and said external protective cover (33) has six tabs (336) forming six openings
    (337) angularly equidistant, in which the flanges (316, 326) of said internal and intermediate protective covers (31, 32) are alternately coupled, and in which said flanges are joined by their perimeter by means of a circumferential weld bead ( 5) to a peripheral nerve of the surface of said housing (4) where said tabs (316, 326, 336) are housed.
    [2]
    2. Gas sensor according to claim 1, characterized in that the inner protective cover (31) has one or more grooves (315) on the side wall
    8

    that fit into one or more grooves (325) that has the intermediate protective cover (32) in the side wall.
    [3]
    3. Gas sensor, according to claims 1 or 2, characterized in that said external protective cover (33) is closed at one end and comprises holes that allow the circulation of the gas to be measured inside.
    9
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    同族专利:
    公开号 | 公开日
    EP3078966A1|2016-10-12|
    EP3078966B1|2017-08-16|
    ES2541081B2|2016-01-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH05249069A|1992-03-09|1993-09-28|Atsugi Unisia Corp|Xoygen sensor|
    JPH09145668A|1995-11-16|1997-06-06|Nippon Soken Inc|Oxygen-concentration sensor|
    US5762771A|1996-02-06|1998-06-09|Denso Corporation|Air-fuel ratio sensor|
    US6206377B1|1998-04-01|2001-03-27|Robert Bosch Gmbh|Seal arrangement for a sensing element of a gas sensor|
    US6214186B1|1998-07-13|2001-04-10|Denso Corporation|Gas sensor having improved structure for installation of protective cover|
    ES2367117T3|2004-07-14|2011-10-28|Robert Bosch Gmbh|MEASUREMENT SENSOR WITH TRIPLE PROTECTION TUBE.|
    DE102011079234A1|2011-07-15|2013-01-17|Robert Bosch Gmbh|Setting a double tube, comprises e.g. pushing inner tube to base body, pushing outer tube to inner tube and base body, and spacing base body side ends of both outer- and inner tube in direction of outer side of base body by distance|
    JP3820785B2|1998-07-13|2006-09-13|株式会社デンソー|Gas sensor|
    EP2940463B1|2003-06-30|2019-11-20|NGK Spark Plug Co., Ltd.|Gassensor comprising a cylindrical protector cap|
    US8132444B2|2009-03-31|2012-03-13|Denso International America, Inc.|Protective heated screen for element|
    JP5747930B2|2012-04-20|2015-07-15|株式会社デンソー|Gas sensor|FR3067396B1|2017-06-13|2021-02-26|Renault Sas|ARRANGEMENT FOR MEASURING GAS PROPERTIES|
    法律状态:
    2016-01-05| FG2A| Definitive protection|Ref document number: 2541081 Country of ref document: ES Kind code of ref document: B2 Effective date: 20160105 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201530455A|ES2541081B2|2015-04-07|2015-04-07|Diesel combustion gas sensor|ES201530455A| ES2541081B2|2015-04-07|2015-04-07|Diesel combustion gas sensor|
    EP16382079.8A| EP3078966B1|2015-04-07|2016-02-25|Diesel exhaust gas sensor|
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