CN105744658B - Ceramic heater and sensor - Google Patents
Ceramic heater and sensor Download PDFInfo
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- CN105744658B CN105744658B CN201510752165.9A CN201510752165A CN105744658B CN 105744658 B CN105744658 B CN 105744658B CN 201510752165 A CN201510752165 A CN 201510752165A CN 105744658 B CN105744658 B CN 105744658B
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- rear end
- ceramic heater
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- 239000000919 ceramic Substances 0.000 title claims abstract description 86
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000004020 conductor Substances 0.000 claims description 14
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 9
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 230000001012 protector Effects 0.000 description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- 238000007747 plating Methods 0.000 description 17
- 229910000679 solder Inorganic materials 0.000 description 13
- 230000002093 peripheral effect Effects 0.000 description 10
- 206010037660 Pyrexia Diseases 0.000 description 9
- 230000008602 contraction Effects 0.000 description 9
- 238000009413 insulation Methods 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 241000278713 Theora Species 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000007784 solid electrolyte Substances 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910017944 Ag—Cu Inorganic materials 0.000 description 1
- 229910002708 Au–Cu Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical group 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Resistance Heating (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
A kind of ceramic heater and sensor, inhibition produces fracture in the heater body portion for being formed with wire portion and electrode pad and crackle.Ceramic heater has: the heater body portion (102) formed by insulating ceramics；The heat generating resistor (141) being embedded in heater body portion；And the electrode pad (121) for being configured on the outer surface in heater body portion and being electrically connected with heat generating resistor, electrode pad is configured in view field (S) by heat generating resistor, and includes the rear end side wire portion (143c) small in width (D) width of the whole region internal ratio electrode pad of view field；It is configured at and leans on front end side than rear end side wire portion and the front end side wire portion (143a) bigger than the width of rear end side wire portion (C) width；And it is configured at than front end side wire portion (143a) by front end side and the small heating part (142) of width (B) width than front end side wire portion (143a).
Description
Technical field
The present invention relates to the ceramic heater with heat generating resistor and electrode pad and has the ceramic heater
Sensor.
Background technique
In the past, there is known a kind of ceramic heater, which has: being formed by insulating ceramics such as aluminium oxide
Heater body portion；The heat generating resistor being embedded in the heater body portion；It is configured on the outer surface in heater body portion
And the electrode pad being electrically connected with heat generating resistor；And the conductor portion of connection heat generating resistor and electrode pad.
In the ceramic heater, the connection terminal connecting via conducting wire with external equipment is connected to electricity by solder etc.
On the pad of pole, so as to be powered via external equipment to heat generating resistor.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2014-13649 bulletin
Summary of the invention
But as shown in Patent Document 1, heat generating resistor has heating part in front end side, leads in rear end side with a pair
The width in line portion, the heating part of front end side is smaller than the width of wire portion.This is because generating heat to be concentrated by heating part, make
The resistivity of heating part is higher.That is, when being powered to heat generating resistor, since the resistivity ratio wire portion of heating part is high, thus
It can more concentrate fever in heating part, and can efficiently use ceramic heater.
On the other hand, as shown in Patent Document 1, the width of wire portion is bigger than the width of heating part, and along ceramic heat
The axis direction of device is generally uniform.Therefore, in the wire portion region opposite with electrode pad, there are the width of wire portion than electricity
The big situation of the width of pole pad.Also, in this case, existed according to situation as follows in heater body
Ora terminalis in the width direction of electrode pad in portion nearby produces fracture a possibility that with crackle etc..
As shown in figure 8, the ceramic heater of pole shape is usually in the upper and lower surfaces of the ceramic layer of plate 1400 point
Electrode pad 1210 and heat generating resistor 1410 Yin Shua not be formed, hereafter, by the way that the ceramic layer 1400 is wound in cylinder
The insulation tube (not shown) of shape or cylindrical shape and formed.In addition, Fig. 8 shows cuing open for cutting ceramic layer 1400 in the width direction
View.
At this point, if printing metallic conductor paste in the lower surface of the ceramic layer 1400 of plate and being formed with desired
Shape heat generating resistor 1410, then cause heat generating resistor 1410 to be received since heat generating resistor 1410 is dry hereafter
Contracting.That is, as shown in figure 8, heat generating resistor 1410 shrinks (reference arrow W1) to the width direction inside of ceramic layer 1400.And
And the influence of the contraction due to heat generating resistor 1410, thus in the upper surface side of ceramic layer 1400 to applying on the outside of width direction
Add stress (reference arrow Y1).
Hereafter, if printing metallic conductor paste in the upper surface of ceramic layer 1400 and forming electrode pad 1210,
It is identical as heat generating resistor 1410, cause electrode pad 1210 to contraction on the inside of width direction since electrode pad 1210 is dry
(reference arrow Z1).As a result, because of caused by the influence of heat generating resistor 1410 upper surface of ceramic layer 1400 stress
Direction and electrode pad 1210 shrink when stress (arrow Z1) direction be produced as being located remotely from each other in the opposite direction.
In such situation, if ceramic layer 1400 is further wound in insulation tube, the upper surface of ceramic layer 1400
The stress of side further increases, as a result, in the presence of in the width direction of the electrode pad in the heater body portion of formation
Ora terminalis a possibility that nearby producing fracture with crackle etc..
The present invention is for solving above-mentioned previous project, it is intended that inhibiting be formed with wire portion and electrode weldering
The heater body portion of disk produces fracture and the case where crackle.
The present invention is ceramic heater, is the pole shape extended in the axial direction, and the ceramic heater has: heater
Main part is formed by insulating ceramics；Heat generating resistor is embedded in the heater body portion；Electrode pad is configured at described
On the outer surface in heater body portion, and it is electrically connected with the heat generating resistor；And conductor portion, connect the heat generating resistor
With the electrode pad,
The ceramic heater is characterized in that the heat generating resistor includes rear end side wire portion, and being configured at will be described
In view field made of electrode pad projects on the direction vertical with the axis direction, and in the view field
The width of electrode pad described in whole region internal ratio is small；Front end side wire portion is configured at than the rear end side wire portion by front end
Side, and it is bigger than the width of the rear end side wire portion；And heating part, it is configured at than the front end side wire portion by front end
Side, and it is smaller than the width of the front end side wire portion.
Ceramic heater according to the present invention, heat generating resistor are configured at electrode pad in the side vertical with axis direction
Upwards in view field made of projection, and have smaller than the width of electrode pad in the whole region in view field
Rear end side wire portion.Even if generating the influence due to the contraction of rear end side wire portion as a result, and generate be applied to heater master
The stress of the contraction of the stress and electrode pad in body portion, the direction of the stress of the two are also the direction cancelled out each other, so as to
Inhibition is produced fracture near the ora terminalis in the width direction of the electrode pad in heater body portion with crackle etc..
Also, ceramic heater according to the present invention, the heat generating resistor, which also includes, to be configured at than rear end side wire portion
By front end side, and the front end side wire portion bigger than the width of rear end side wire portion；And it is configured at and is leaned on than front end side wire portion
Front end side, and the heating part smaller than the width of front end side wire portion.In this way, due to being formed than heating part and rear end side wire portion
Wide front end side wire portion, it is thus possible to concentrate fever in heating part, so as to efficiently use ceramic heater.
Also, in ceramic heater of the invention, the width of the heating part is preferably than the rear end side wire portion
Width it is small.In this way, the width by heating part is smaller than the width of rear end side wire portion, it can effectively concentrate fever in fever
Portion, without generating heat in rear end side wire portion, so as to efficiently use ceramic heater.
Also, in ceramic heater of the invention, preferably, there is the heat generating resistor connection front end side to lead
Line portion and the rear end side wire portion and with the connecting wire portion that width reduces towards axis direction rear end side.In this way, logical
It crosses with the connecting wire portion that width reduces towards axis direction rear end side, it will not be in front end side wire portion and rear end side
The corner for being easy to electric field concentration is formed between wire portion, so as to inhibit insulating properties to reduce.
In addition, the connecting wire portion is characterized in that being configured at than the projection in ceramic heater of the invention
Front end side is leaned in region.Thereby, it is possible to which the width of wire portion is effectively set as smaller than the width of electrode pad in view field,
The ora terminalis in width direction so as to further suppress the electrode pad in heater body portion is nearby produced fracture and is split
Line etc..
Also, sensor of the invention has the sensor element of bottomed tube, the main body of the sensor element is kept to match
Part and the ceramic heater being configured in the bore of the sensor element.
The sensor is characterized in that the ceramic heater is in any one of claim 1 to claim 4 institute
The ceramic heater of record.
In this way, in the sensor element for having bottomed tube, keeping the main metal fixture of the sensor element and being configured at
In the sensor of ceramic heater in the bore of the sensor element use ceramic heater of the invention, so as into
The inhibition of one step is produced fracture near the ora terminalis in the width direction of the electrode pad in heater body portion with crackle etc..
Detailed description of the invention
Fig. 1 is the integrally-built cross-sectional view for illustrating the sensor 1 of embodiment 1.
Fig. 2 is the perspective view for indicating the appearance of ceramic heater 100 of embodiment 1.
Fig. 3 is the exploded perspective view for indicating the internal structure of ceramic heater 100 of embodiment 1.
Fig. 4 is the slave arrow direction observation near the joint portion in chain-dotted line A-A ' in the ceramic heater 100 of Fig. 2
Partial sectional view.
Fig. 5 is the electrode weldering of the ceramic heater 100 of visual confirmation embodiment 1 on the direction vertical with axis direction
The explanatory diagram of disk 121.
Fig. 6 is the explanatory diagram for illustrating the invention effect of ceramic heater 100 of embodiment 1.
Fig. 7 is the electrode pad of the ceramic heater of visual confirmation embodiment 2 on the direction vertical with axis direction
Explanatory diagram.
Fig. 8 is the explanatory diagram for illustrating previous ceramic heater.
Specific embodiment
Hereinafter, being illustrated using attached drawing to using embodiments of the present invention 1.
In addition, the present invention is at all not limited to the following embodiments and the accompanying drawings, it, can as long as belonging to technical scope of the invention
Using various modes, this is self-evident.
Fig. 1 is the integrally-built cross-sectional view for illustrating the sensor 1 based on embodiment 1.The sensor 1 of embodiment 1
To be fastened with the exhaust flow path of the internal combustion engine carried on the vehicle of passenger car etc., and it is configured in the inside of exhaust flow path
The sensor of the front end portion of itself, and be the lambda sensor of the oxygen concentration in measurement discharge gas.
In addition, in the following description, in the direction of axes O shown in FIG. 1 relative to main metal fixture protector
80 installation side (downside of figure) is front end side, with the opposite side (upside of figure) is rear end side and is illustrated.
As shown in Figure 1, mainly having in sensor 1: sensor element 10 (detecting element 10), ceramic heater 100,
Separator 30, multiple connection terminals 50, conducting wire 55 (wire guiding member 55), covers theirs at seal member 40 (elastomeric element 40)
Main metal fixture 60, protector 80 and the outer cylinder 90 (outer cylinder member 90) etc. of surrounding.
Sensor element 10 is formed by the solid electrolyte with oxygen-ion conductive.Sensor element 10 is well known
Structure, and be formed as the cylindrical shape extended along axes O direction, and be configured to mainly have: end (Fig. 7 of closed front side
Downside end) element body 12；It is set to the lateral electrode (illustration omitted) of the outer peripheral surface of element body 12；And it sets
It is placed in the medial electrode (illustration omitted) of the inner peripheral surface of element body 12.Element body 12 central portion periphery in the circumferential direction
It is provided with to radial outside flange part 14 outstanding.
As the solid electrolyte for constituting element body 11, such as so that Y2O3Or the ZrO of CaO solid solution2To represent.In
Also oxide and the ZrO as alkaline-earth metal or rare earth metal can be used other than the solid electrolyte2Solid solution consolidate
Body electrolyte.Also, oxide and the ZrO in alkaline-earth metal or rare earth metal also can be used2Solid solution in also contain
HfO2Solid electrolyte.
Lateral electrode or medial electrode are the electricity for forming Pt Pt alloy (hereinafter, being recorded as " Pt etc. ") porously
Pole.
Lateral electrode or medial electrode are abutted with multiple connection terminals 50.Connect in multiple connection terminals 50 containing inside
Connecting terminal 51 and outside connection terminal 52.Multiple connection terminals 50 are by nickel alloy (such as Inconel750.Britain Inconel
Corporation, registered trademark) formed metal fittings.
The medial electrode of inside connection terminal 51 and sensor element 10 is in electrical contact, outside connection terminal 52 and sensor member
The lateral electrode of part 10 is electrically connected.Also, inside connection terminal 51 holds aftermentioned ceramic heater 100 and by ceramic heater
The inner surface of the lateral sensor element 10 in 100 front end pushes.
Multiple terminal metal fittings 50 are riveted and are electrically connected with the core wire of conducting wire 55 respectively.In fig. 1 it is illustrated that there is 4 to lead
3 conducting wires 55 in line 55.
As shown in Figure 1, separator 30 is the component for being configured at the rear end side of sensor element 10, and for by having electricity absolutely
The component for the cylindrical shape that the material of edge such as aluminium oxide is formed.The multiple terminal metals of receiving are provided in separator 30 to match
The receiving portion 31 of part 50 etc..Receiving portion 31 is the through hole for penetrating through and being formed along axes O direction in separator 30, and can be
The space of front end side is leaned on than separator 30 and the atmosphere that circulates between the space of rear end side.
In addition, the outer peripheral surface in separator 30 is provided with to radial outside flange portion 32 outstanding.In separator 30
Than flange portion 32 configured with the holding metal fittings 33 for being shaped generally as cylindrical shape on the outer peripheral surface of front end side.At this point, point
Parting 30 is configured to be inserted into the inside for keeping metal fittings 33.
Seal member 40 is configured at the rear end side of separator 30, and the bolt to be made of the elastic material of such as fluorubber etc.
Component.Seal member 40 is the component for being formed as a generally cylindrical the rear end of blocking outer cylinder 90 of shape.Seal member 40 with point
The mode that the face of the rear end side of parting 30 abuts is embedded in the opening of the rear end side of outer cylinder 90.
As shown in Figure 1, main metal fixture 60 is by stainless steel alloy (for example, JIS (Japanese Industrial Standards) specification
SUS310S) the component formed, and to be formed as the component of general cylindrical shape.It is provided in the circumferential direction in main metal fixture 60
The stage portion 61 of flange part 14 prominent towards radially inner side and support sensor element 10 from inner circumferential.
It is provided in the circumferential direction on the outer peripheral surface of the front end side of main metal fixture 60 and sensor 1 is installed on internal-combustion engine
The threaded portion 62 of the exhaust flow path (not shown) of machine；And it is used in the installation tool engaging that threaded portion 62 is screwed into exhaust flow path
Hexagonal portion 63.Cricoid washer 64 is configured between threaded portion 62 and hexagonal portion 63.Washer 64 is prevented from 1 He of sensor
The gas in the gap between exhaust flow path leaks.
Ratio threaded portion 62 in main metal fixture 60 is formed with the front end card engaged with aftermentioned protector 80 by front end side
Conjunction portion 65.Engagement tip 65 is the part formed in the diameter of the outer peripheral surface mode smaller than threaded portion 62.Also, match in main body
Lean on rear end side to be sequentially formed with the rear end engaged with outer cylinder 90 towards rear end side from hexagonal portion than hexagonal portion 63 in part 60
Holding section 66 and the riveting fixed part 67 for riveting fixed sensor element 10.
In the inside of main metal fixture 60 to have metal front end side seal from stage portion 61 towards being arranged in order for rear end side
Piece installing 71, metal rear end side packaging part 73, is made of the powder of talcum the support member 72 for the tubular being made of aluminium oxide
Filling component 74, aoxidize aluminum sleeve 75 and cricoid ring 76.Step is formed on the inner peripheral surface of support member 72
Portion is supported by the flange part 14 of element body 11 by the stage portion.In addition, being pressed from both sides between support member 72 and flange part 14
It is configured with rear end side packaging part 73 with holding.
Ring 76 is configured between sleeve 75 and riveting fixed part 67, and riveting fixed part 67 will be by radially inner side and forward
End side deformation and apply extreme direction forward power be transmitted to filling component 74, rear end side packaging part 73, support member 72 and
Front end side packaging part 71.By the power of the pushing, filling component 74 compresses filling to axes O direction and airtightly landfill main body is matched
Gap between the inner peripheral surface of part 60 and the outer peripheral surface of element body 11.
Protector 80 be protect when sensor 1 is installed on exhaust flow path into flow path sensor element 10 outstanding not with
The protector of the collisions such as water droplet included in the gas flowed in flow path and foreign matter.Protector 80 be by stainless steel (for example,
The SUS310S of JIS (Japanese Industrial Standards) specification) formed component, and for covering sensor element 10 front end protection
Component.Protector 80 is the component of the tubular extended in the axial direction, and is formed as the shape of closed front.After protector 80
Ora terminalis is fixed and 65 welding of engagement tip with main metal fixture 60.
Be provided in holder 80 be formed as bottomed tube and open wide side peripheral part it is chimeric with engagement tip 65
Outside protector 81；And it is fixed on the inside protector 82 for being formed as bottomed tube of the inside of outside protector 81.It changes
Sentence is talked about, and protector 80 has the duplex being made of outside protector 81 and inside protector 82.
The barrel surface of protector 81 and inside protector 82, which is provided with, on the outside introduces gas into internal introducing port
83.In Fig. 1, the introducing port 83 of outside protector 81 is only illustrated, and in not shown due on configuration relation
The introducing port 83 of side protector 82.In addition, the row of being respectively arranged on the bottom surface of protector 81 and inside protector 82 on the outside
The outside outlet 84 and inside outlet 85 of internal water droplet and gas are entered out.
Outer cylinder 90 is by the stainless steel different from main metal fixture 60 (such as JIS (Japanese Industrial Standards) specification
SUS304L) the component formed, in rear end holding section 66 of the inside of outer cylinder 90 inserted with main metal fixture 60, outer cylinder 90 is fixed on
Main metal fixture 60.The inside of outer cylinder 90 be configured with from the rear end of the rear end of main metal fixture 60 sensor element 10 outstanding, point
Parting 30 and seal member 40.
Also, in the sensor of embodiment 11, the ceramic heater 100 of embodiment 1 is as heating sensing
The heater of device element 10 and be configured in the bore of sensor element 10.
Fig. 2 is the perspective view for indicating the appearance of ceramic heater 100.Fig. 3 is the internal structure for indicating ceramic heater 100
Exploded perspective view.
In addition, in the ceramic heater 100 of present embodiment, to have heating part in the both ends in the direction axis AX
The side (side for forming aftermentioned heating part 142) divided is " front end side ", with the end of side in contrast for " rear end side "
And illustrate.
Ceramic heater mainly has: the heater master of the pole shape (generally cylindrical shaped) with heat generating resistor 141
Body portion 102, the outer surface for being set to heater body portion 102 and the electrode pad 121 being electrically connected with heat generating resistor 141 and
The metal end sub-portion 130 engaged by the solder of electric conductivity with electrode pad 121.
Ceramic heater 100 is to fill via the electrode pad 121 of the rear end side setting in heater body portion 102 from outside
It sets (power supply device) to be powered to heat generating resistor 141, thus the structure that heat generating resistor 141 generates heat.In addition, heat generating resistor
Heating part 142 (referring to Fig. 2) in 141 is configured at the front end side in heater body portion 102.That is, ceramic heater 100 is configured to
Pass through the front end side fever heating sensor element 10 in heater body portion 102.
As shown in figure 3, ceramic heater 100 passes through blank volume 140,146 of the higher aluminium oxide ceramics of insulating properties
It is around in the periphery of the insulation tube 101 of the aluminium oxide ceramics of pole shape and it is fired and is manufactured.
The heat generating resistor 141 based on the material of tungsten system as heating pattern is formed in blank 140.Fever
A pair that resistor 141 is configured to have the heating part 142 for being formed in front end side and connect respectively with the both ends of heating part 142 is led
Line portion 143.Further, couple of conductor portion 143 is configured to have the front end side wire portion 143a for being formed in front end side respectively, be formed
In the rear end side wire portion 143c of rear end side and front end side wire portion 143a and rear end side wire portion 143c be attached
Connecting wire portion 143b.In addition, the width A of heating part 142 is smaller than the width B of front end side wire portion 143a.
Also, there are two conductor portions 144 in the setting of the rear end side of blank 140.Couple of conductor portion 143 is via two conductor portions
144 are electrically connected with two electrode pads 121 on the outer surface for being formed in ceramic heater 100.
Also, blank 146 is the sheet material connect with the face pressure of 141 side of heat generating resistor formed in blank 140.
Aluminium oxide cream is coated on the surface of the opposite side of the electrolysis to connect with blank 140 in blank 146, and
Insulation tube 101 is wound in by blank 140,146 as inside using the coated face and is pressed inwardly from periphery, ceramic heat is formed
Device formed body.Hereafter, ceramic heater 100 is formed by firing ceramics heater formed body.
Then, as shown in FIG. 2 and 3, two as anode-side and cathode side are formed in ceramic heater 100
A electrode pad 121.The electrode pad 121 is outer blank 140 corresponding with above-mentioned two conductor portions 144 (referring to Fig. 3)
It is respectively set on two positions on surface.Conducting with the wire portion 143 of heat generating resistor 141 is via in conductor portion 144
Portion filling conductive paste and carry out.In addition, being formed with metal layer (Fig. 4 institute of aftermentioned plating on the surface of electrode pad 121
The pad plating film 122 shown).
Metal end sub-portion 130 is made of the nickel part of elongate in shape, and is configured to have through solder and electrode pad
The linking part at the joint portion 133 of engagement, the caulking part 135 for being cut into writing board shape and connection joining part 133 and caulking part 135
134。
The front end portion of linking part 134 is formed as being bent into a thickness direction step-like and connect with joint portion 133.And
And in metal end sub-portion 130, the connecting area distortion with caulking part 135 in linking part 134 is with the length of linking part 134
The central axis in degree direction rotates for rotation center.
Also, metal end sub-portion 130 is fixed on caulking part by the core wire joint filling of the conducting wire 55 of external circuit connection
135, thus via the equal conducting realized with external circuit (external electrical apparatus) of conducting wire 55.
The two metal end sub-portions 130 constituted in this way are engaged with two electrode pads 121 respectively, as to ceramic heater
100 application voltage when anode side terminal and cathode side terminal and function.
Fig. 4 is the slave arrow side near the joint portion 133 in chain-dotted line A-A ' in ceramic heater 100 shown in Fig. 2
To the partial sectional view of observation.In addition, in Fig. 4, from metal end sub-portion 130 towards the central axis of ceramic heater 100
Direction (direction under paper in figure) be lower direction, and with far from central axis direction (direction on paper in figure) be upper direction and
It is illustrated.
As shown in figure 4, electrode pad 121 is in the outer surface for the blank 140 for being wound in the periphery of insulation tube 101 (in Fig. 3
The face of upside) on formed, and via the fever of conductor portion 144 and the inner surface (face of the downside in Fig. 3) for being formed in blank 140
The wire portion 143 of resistor 141 is connected.
The electrode pad 121 is in the way of accounting for 80% or more weight comprising at least one kind by selecting from tungsten, molybdenum
The metal layer of the bond pad shapes for the material of main part that element more than class is constituted.Lead and molybdenum fusing point height and excellent heat resistance, thus it is suitable
Cooperation is the composition of electrode pad 121.
Metal end sub-portion 130 is by including that the nickel part of nickel is constituted in the way of accounting for 90% or more weight.As shown in figure 4, golden
Belong to portion of terminal 130 to engage by solder portion 124 with the electrode pad 121 covered by pad plating film 122.Also, by pricker
The nickel plating based on nickel (Ni) is also formed on the metal terminal 130 and electrode pad 121 that material portion 124 is interconnected
Film 125 and the chromium plating film 126 based on chromium (Cr).In addition, it is formed with chromium plating film 126 in the upside of nickel plating film 125,
The oxidation due to solder portion 124 and metal end sub-portion 130 is prevented and having nickel plating film 125 and chromium plating film 126
Caused by corrode.
Chromium plating film 126 is replaced alternatively, it is also possible to form nickel plating film, platinum plating film and golden plating film.
Also, the solder portion 124 that electrode pad 121 and metal end sub-portion 130 are engaged using Au-Cu solder and
Ag-Cu solder is brazed electrode pad 121 and metal end sub-portion 130.
In addition, during the brazing process, the nickel ingredient of the pad being arranged on electrode pad plating film 122 expands to solder portion 124
It dissipates.
That is, as shown in figure 3, in the ceramic heater 100 of embodiment 1, pad plating film 122 before soldering with
The boundary part in solder portion 124 shows the chamfered shape shown in chain-dotted line 123.Also, after brazing, pad plating film
122 a part becomes the form for spreading and being added to solder portion 124, and pad plating film 122 and solder portion 124 are with one
The state of change and formed.
Fig. 5 is the electrode weldering of the ceramic heater 100 of visual confirmation embodiment 1 on the direction vertical with axis direction
The explanatory diagram of disk 121.In addition, in Fig. 5, in order to which the position between clear electrode pad 121 and rear end side wire portion 143c is closed
System omits solder portion 124 and metal end sub-portion 130.Although also, wire portion 143 is embedded in heater body portion 102, is
Ease of explanation, is shown in broken lines in Fig. 5.
As shown in figure 5, rear end side wire portion 143c configuration is with the direction (paper in Fig. 5 vertical with the direction axis AX
Direction in table) on project made of electrode pad 121 in view field S (oblique line portion in Fig. 5).Also, in view field S
In interior whole region, the width C of rear end side wire portion 143c is smaller than the width D of electrode pad 121.That is, rear end side wire portion
143 two ora terminalis 143cT are configured in width direction in a manner of not being overlapped with the boundary ST in the width direction of view field S
Side.Even if being applied to heater body portion 102 caused by generating the influence by the contraction of rear end side wire portion 143c as a result, to answer
The stress of the contraction of power and electrode pad 121, the direction of the stress of the two also becomes the direction cancelled out each other, so as to inhibit
Produced fracture near the ora terminalis in the width direction of the electrode pad 121 in heater body portion 102 with crackle etc..
For the reason, it is shown in FIG. 6.Fig. 6 is the The effect of invention for illustrating the ceramic heater 100 of embodiment 1
Explanatory diagram, to be wound in the blank 140 before insulation tube 101.As shown in fig. 6, if printing paste in the lower surface of blank 140
Metallic conductor and form the heat generating resistor 141 with desired shape, then hereafter since heat generating resistor 141 is dry
And heat generating resistor 141 is caused to shrink.That is, as shown in fig. 6, heat generating resistor 141 (rear end side wire portion 143c) is to blank 140
Width direction on the inside of shrink (reference arrow W).Also, the influence of the contraction due to heat generating resistor 141, thus in blank
140 upper surface side applies stress to width direction outside.(reference arrow Y).
Hereafter, if printing metallic conductor paste in the upper surface of blank 140 and forming electrode pad 121, with hair
Thermal resistor 141 is identical, causes electrode pad 121 to contraction on the inside of width direction (referring to arrow since electrode pad 121 is dry
Head Z).But in the embodiment 1, since electrode pad to be configured in view field S, and it is whole in view field S
The width C of rear end side wire portion 143c is set as smaller than the width D of electrode pad 121 in a region, so by rear end side conducting wire
The influence of portion 143c and when the contraction of the direction of the stress (arrow Y) of the upper surface of blank 140 and electrode pad 121 that generate
The direction of stress (arrow Z) generates in a manner of towards the direction cancelled out each other.
In such situation, even if blank 140 is wound in insulation tube 101, also it is able to suppress in heater body portion
Ora terminalis in the width direction of electrode pad 121 in 102 is nearby produced fracture with crackle etc..
Also, it according to the ceramic heater of embodiment 1 100, is set as the width B of front end side wire portion 143a to compare rear end
The width C of side wire portion 143c is big, and the width A of heating part 142 is set as smaller than the width B of front end side wire portion 143a
(referring to Fig. 3).In this way, due to width C of the formation width B than the width A and rear end side wire portion 143c of heating part 142 it is big before
End side wire portion 143a, it is thus possible to more concentrate fever in heating part 142, and can efficiently use ceramic heater 100.
Also, according to the ceramic heater of embodiment 1 100, the width A of heating part 142 is set as than rear end side conducting wire
The width C of portion 143c is small.In this way, the width A due to heating part 142 is smaller than the width C of rear end side wire portion 143c, thus rear
End side wire portion 143c will not generate heat and can effectively concentrate fever in heating part 142, so as to efficiently use ceramics
Heater 100.
Also, according to the ceramic heater of embodiment 1 100, preferably, front end side wire portion 143a and rear end side are led
Line portion 143c is attached, and is had with the connecting wire portion 143b that width reduces towards axis AX direction rear end side.
In this way, due to having with the connecting wire portion 143b for the cone cell that width reduces towards axis AX direction rear end side, because without
The corner for being easy to electric field concentration can be formed between front end side wire portion and rear end side wire portion, therefore is able to suppress insulating properties drop
It is low.
In addition, connecting wire portion 143b is configured at more forward than view field S according to the ceramic heater 100 of embodiment 1
End side.As a result, in view field S, the width C of rear end side wire portion 143c can be effectively set as than electrode pad 121
Width D it is small, therefore the end in the width direction of the electrode pad 121 in heater body portion 102 can be further suppressed
Edge is nearby produced fracture with crackle etc..
More than, embodiments of the present invention 1 are illustrated, but the present invention is not limited to above embodiment 1, In
In the range of not departing from purport of the invention, it can be implemented with various modes.
For example, in the embodiment 1, to connecting wire portion 143b be configured at than view field S by front end side mode into
Explanation is gone, but it is not limited to this.For example, as shown in fig. 7, a part of connecting wire portion 143b can also be with view field S
It is overlapped.But preferably, the width of connecting wire portion 143b is small in the width D of view field S internal ratio electrode pad 121.
Label declaration
1 sensor
10 sensor elements
100 ceramic heaters
102 heater body portions
121 electrode pads
141 heat generating resistors
142 heating parts
143 wire portions
The front end side 143a wire portion
143b connecting wire portion
143c rear end side wire portion
S view field.
Claims (4)
1. a kind of ceramic heater is the ceramic heater of the pole shape extended in the axial direction, has:
Heater body portion, is formed by insulating ceramics；
Heat generating resistor is embedded in the heater body portion；
Electrode pad is configured on the outer surface in the heater body portion, and be electrically connected with the heat generating resistor；And
Conductor portion connects the heat generating resistor and the electrode pad,
The ceramic heater is characterized in that,
The heat generating resistor includes
Rear end side wire portion is configured at throwing made of projecting the electrode pad on the direction vertical with the axis direction
In the domain of shadow zone, and in the whole region of the view field rear end side wire portion width than the electrode pad
Width is small；
Front end side wire portion is configured at and leans on front end side, and the width of the front end side wire portion than the rear end side wire portion
Width than the rear end side wire portion is big；And
Heating part is configured at and leans on front end side, and the width ratio of the line with heating function in the heating part than the front end side wire portion
The width of the front end side wire portion is small,
The heat generating resistor, which has, connects the front end side wire portion and the rear end side wire portion and with towards axis side
The connecting wire portion that end side and width reduce backward.
2. ceramic heater according to claim 1, which is characterized in that
The width of the heating part is smaller than the width of the rear end side wire portion.
3. ceramic heater according to claim 1 or 2, which is characterized in that
The connecting wire portion is configured at than the view field by front end side.
4. a kind of sensor, has:
The sensor element of bottomed tube；
Main metal fixture keeps the sensor element；And
Ceramic heater is configured in the bore of the sensor element,
The sensor is characterized in that,
The ceramic heater is described in any item ceramic heaters of claims 1 to 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-259911 | 2014-12-24 | ||
| JP2014259911A JP6291411B2 (en) | 2014-12-24 | 2014-12-24 | Ceramic heater and sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105744658A CN105744658A (en) | 2016-07-06 |
| CN105744658B true CN105744658B (en) | 2019-12-03 |
Family
ID=56295952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510752165.9A Active CN105744658B (en) | 2014-12-24 | 2015-11-06 | Ceramic heater and sensor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6291411B2 (en) |
| CN (1) | CN105744658B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870839A (en) * | 2005-05-27 | 2006-11-29 | 京瓷株式会社 | Ceramic heater and heating iron using same |
| CN101723699A (en) * | 2008-10-24 | 2010-06-09 | 日本特殊陶业株式会社 | Ceramic junction member, ceramic heater and gas sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08273814A (en) * | 1995-03-29 | 1996-10-18 | Ngk Spark Plug Co Ltd | Ceramic heater |
| JP2001257062A (en) * | 2000-03-13 | 2001-09-21 | Ibiden Co Ltd | Ceramic heater |
| JP2001257059A (en) * | 2000-03-13 | 2001-09-21 | Ibiden Co Ltd | Ceramic heater |
-
2014
- 2014-12-24 JP JP2014259911A patent/JP6291411B2/en active Active
-
2015
- 2015-11-06 CN CN201510752165.9A patent/CN105744658B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870839A (en) * | 2005-05-27 | 2006-11-29 | 京瓷株式会社 | Ceramic heater and heating iron using same |
| CN101723699A (en) * | 2008-10-24 | 2010-06-09 | 日本特殊陶业株式会社 | Ceramic junction member, ceramic heater and gas sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6291411B2 (en) | 2018-03-14 |
| JP2016122489A (en) | 2016-07-07 |
| CN105744658A (en) | 2016-07-06 |
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