Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
  • G01K13/00—Thermometers specially adapted for specific purposes
  • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
  • G01N27/416—Systems
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
  • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
  • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
  • G01N27/403—Cells and electrode assemblies
  • G01N27/406—Cells and probes with solid electrolytes
  • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
  • G01N27/403—Cells and electrode assemblies
  • G01N27/406—Cells and probes with solid electrolytes
  • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
  • G01N27/4078—Means for sealing the sensor element in a housing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
  • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
  • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors

Definitions

• the invention relates to a sensor arrangement according to the preamble of claim 1.
• the senor is inserted into the receptacle on the exhaust pipe so that the gas inflow opening in the protective pipe points in the flow direction of the exhaust gas.
• the housing is clamped by means of a union nut in a receptacle fastened to the exhaust pipe, in which the housing is accommodated.
• the sensor arrangement according to the invention with the features of claim 1 has the advantage that the fixing of the thread punctures in the two parts to be screwed together, namely housing and receptacle, and the correct position of the measuring element is always established independently of the installer due to the prescribed tightening torque. Since the housing itself is screwed into the receptacle, additional elements, for example a union nut, for fixing the sensor in the receptacle, which are little valued as lost parts, are superfluous.
• a marking is arranged on the housing, which provides an orientation for the installation of the measuring element and with respect to the
• Tapping the external thread is oriented on the housing. Since in the manufacture of the sensor the housing with the outer housing is finished before the measuring element is inserted, the marking oriented with respect to the thread piercing, e.g. a simple radial blind hole in the housing, ensuring that the measuring element is inserted into the housing in the correct orientation.
• the sensor arrangement according to the invention with the features of claim 4 has the advantage that with existing
• FIG. 1 is a side view of a sensor arrangement, partially in section,
• Fig. 2 is a plan view of an insert ring in the
• Fig. 3 shows a longitudinal section of the sensor arrangement in
• Fig. 4 is an enlarged view of the detail
• FIG. 5 is an enlarged view of section V in Fig. 3,
• FIG. 6 shows the same representation as in FIG. 5 with a modification of the sensor arrangement
• Fig. 7 is a side view of a sensor arrangement according to a further embodiment, partly in section. Description of the embodiments
• the sensor arrangement shown in FIGS. 1 and 3 has a sensor 10, seen in side view in FIG. 1 and in longitudinal section in FIG. 3, for measuring a gas parameter of a measuring gas, and a measuring gas line 11 shown in cross section in FIGS. 1 and 3, which is traversed by a sample gas.
• the sensor 10 is a so-called lambda probe for measuring the oxygen concentration as a gas parameter in the exhaust gas of an internal combustion engine
• the measurement gas line 11 is an exhaust gas pipe leading from one or more combustion cylinders of the internal combustion engine.
• the sensor 10 has a sensor or a measuring element 13
• the measuring element 13 is comprised of an electrically insulating, measuring gas-side ceramic insert 14, an electrically insulating, connection-side ceramic insert 15 and an intermediate, packet-like seal 16, which in turn are supported on the inner wall of the housing 12.
• the measuring gas-side ceramic insert 14 lies on a shoulder 17 on the inside wall of the housing, and the upper edge of the housing is crimped onto the connection-side ceramic insert 15.
• the connection-side ceramic insert 15 rests on a shoulder formed in the housing 12 and the lower housing edge is crimped onto the ceramic insert 14 on the measuring gas side.
• the packet-like seal can consist of three superimposed sealing elements exist, the two outer z. B. is made of steatite and the middle of boron nitride.
• a metal sleeve 18 is placed on the housing 12 and covers an electrical clamp connector 19 that contacts the connection-side section 132 of the measuring element 13 and a connecting strand 20.
• a protective tube 21 which covers the section 131 of the measuring element 13 on the measuring gas side is pushed onto the end of the housing 12 remote from the metal sleeve 18. Gas inlet openings 22 are present in the protective tube 21, so that after installation of the sensor 10 in the sample gas line 11, the sample gas flowing in the sample gas line 11 can reach the measuring element 13 through the gas inlet openings 22.
• the housing 12 is with one on the
• the sample gas line 11 has a sensor insertion opening 25 machined in the line wall 111 and a receptacle 26 for the housing 12 of the sensor 10 which surrounds the sensor insertion opening 25 and which is fastened on the line wall 111.
• the receptacle 26 has a beveled support shoulder 27 for the radial flange 23 of the housing 12 and an internal thread 28 which corresponds to the external thread of the hollow screw 24.
• the receptacle 26 can be designed as a hollow connector which is inserted into an expanded sensor insertion opening 25 in the line wall 111 and is welded all around to the line wall 111.
• the Hollow socket can also be placed on the line wall 111, enclosing the sensor insertion opening 25, and welded to the line wall 111.
• the senor 10 When mounting the sensor arrangement, the sensor 10 is inserted with its housing 12 into the receptacle 26 on the sample gas line 11, the protective tube 21 passing through the sensor inlet opening 25 into the interior of the sample gas line 11 and the housing 12 so far into the receptacle 26 inserts that the radial flange 23 rests with its beveled underside on the beveled support shoulder 27 in the receptacle 26. Then the banjo bolt 24 is pushed over the metal sleeve 28 and the housing 12 and screwed into the internal thread 28 of the receptacle 26 until its annular end face has clamped the radial flange 23 on the support shoulder 27.
• an assembly aid which has an assignment element which is arranged on the housing 12 and which is oriented with respect to the installation position of the measuring element 13 and an assignment element which is arranged with the receptacle 26 and is oriented with respect to the measurement gas flow.
• the assignment element arranged on the receptacle 26 is a freely running front face that runs in the area of the internal thread 28
• Axial groove 29 and that formed on the housing 12 Assignment element has a protruding nose 30 projecting radially beyond the housing circumference, which slides in a form-fitting manner in the axial groove 29 when the housing 12 is inserted into the receptacle 26 and prevents the sensor 10 from rotating about its axis.
• the protruding nose 30 projecting radially beyond the housing circumference, which slides in a form-fitting manner in the axial groove 29 when the housing 12 is inserted into the receptacle 26 and prevents the sensor 10 from rotating about its axis.
• Projecting nose 30 is a one-piece part of an insert ring 31 which rests on the flange surface of the radial flange 23 facing the banjo bolts 24 and is fixedly connected to the housing 12, preferably pressed onto the housing 12.
• the insert ring 31 is pressed onto the housing 12 in such a way that the protruding nose 30 is oriented in the housing 12 with respect to the predetermined installation position of the measuring element 13.
• the housing 12 can have a flat flat section 121 on its circumference and the insert ring 31 can be bent in its ring area 311 assigned to the flat section 121 such that the ring area 311 lies flat against the flat section 121 (FIGS. 2 and 5).
• the bent ring region 311 is preferably placed on the insert ring 31 in such a way that it is diametrically opposed to the protruding nose 30 (FIGS. 1-3).
• the flat section 121 is used to align the measuring element 13 with respect to the housing 12, in that the measuring element 13 is oriented such that it has a specific rotational position with respect to the flat section 121 of the housing 12. If the insert ring 31 is then pushed onto the housing 12, the protruding nose 30 has the desired orientation with regard to the alignment of the measuring element 13 in the housing 12.
• the protruding nose 30 can also be integrally formed on the housing 12.
• the protruding nose 30 is formed by an insertion pin 32 which is pressed into a radially introduced blind hole 33 in the housing 12.
• the part of the insertion pin 32 protruding from the blind bore 33 forms the protruding nose 30 which, as in the exemplary embodiment described above, positively projects into the axial groove 29 in the groove width.
• the tapping of the external thread 34 on the housing 12 is oriented with respect to the installation position of the measuring element 13 in the housing 12 and the tapping of the internal thread 28 in the receptacle 26 with respect to the Sample gas flow oriented.
• the housing 12 can only be screwed into the receptacle 26 from a certain rotational position about its longitudinal axis. If a predetermined tightening torque is then applied to the hexagon 35 after the housing 12 has been screwed in completely, the measuring element 13 in the sample gas line 11 is aligned in the desired position.
• the tightening torque can be checked using a torque wrench.
• the housing 12 with the external thread 34 and hexagon 35 is first finished and then the measuring element 13 with the ceramic inserts 14, 15 and the seal 16 is inserted into the housing 12.
• a marking 36 is attached to the housing 12 and is oriented with respect to the tapping of the external thread 34.
• the marking 36 is designed as a small radial blind bore 37 which is introduced into the hexagon 35. With the aid of this marking 36, the measuring element 13 can be very easily fixed in the housing 12 in the manufacturing process in such a way that it has the required orientation with regard to the tapping of the external thread 34.
• the invention is not limited to the sensor arrangement described with a lambda probe immersed in the exhaust pipe of an internal combustion engine.
• a lambda sensor e.g. Temperature, humidity or pressure sensors which detect a corresponding parameter of the sample gas, that is to say temperature, humidity or pressure, are used in the same way.

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• General Physics & Mathematics (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Molecular Biology (AREA)
• Electrochemistry (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Measuring Oxygen Concentration In Cells (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2002
  • 2002-03-08 DE DE10210313A patent/DE10210313B4/de not_active Expired - Fee Related
• 2003
  • 2003-02-17 KR KR10-2004-7013993A patent/KR20040089711A/ko not_active Application Discontinuation
  • 2003-02-17 JP JP2003575094A patent/JP2005519302A/ja not_active Withdrawn
  • 2003-02-17 WO PCT/DE2003/000463 patent/WO2003076920A1/de not_active Application Discontinuation
  • 2003-02-17 US US10/506,642 patent/US20050155408A1/en not_active Abandoned
  • 2003-02-17 EP EP03704311A patent/EP1485699A1/de not_active Withdrawn

Non-Patent Citations (1)

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