WO2015060380A1 - 温度センサ - Google Patents
温度センサ Download PDFInfo
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- WO2015060380A1 WO2015060380A1 PCT/JP2014/078206 JP2014078206W WO2015060380A1 WO 2015060380 A1 WO2015060380 A1 WO 2015060380A1 JP 2014078206 W JP2014078206 W JP 2014078206W WO 2015060380 A1 WO2015060380 A1 WO 2015060380A1
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- WO
- WIPO (PCT)
- Prior art keywords
- temperature sensing
- temperature
- temperature sensor
- tip
- end side
- Prior art date
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- 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
- G01K1/08—Protective devices, e.g. casings
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
Definitions
- the present invention relates to a temperature sensor including a temperature sensitive element such as a thermistor element or a Pt resistor element.
- a temperature sensing element such as a thermistor element, a sheath part that insulates and holds a metal core wire that is electrically connected to an element electrode wire extending from an electrode of the temperature sensing element by welding joint, a temperature sensing element, a metal
- a temperature sensor mainly composed of a metal tube that accommodates a core wire and a sheath part, and a cement that is filled in the metal tube and holds a temperature sensitive element and a metal core wire (for example, Patent Documents 1 to 3). reference.).
- Such a sensor is used for exhaust gas measurement of a vehicle-mounted temperature sensor or a stationary general-purpose engine. In other words, it is used as a sensor that is used under use conditions where the measurement temperature is high and vibration is applied around the heat-sensitive part, such as a high-temperature sensor.
- JP 2009-175129 A Japanese Patent No. 4760584 Japanese Patent No. 4768432
- cement is filled up to the tip of the metal tube in order to hold the temperature sensitive element inside the metal tube.
- the method include a method of filling the cement to the tip of the metal tube by applying centrifugal force or the like before the cement filled in the metal tube is solidified.
- the temperature around the temperature sensing element may suddenly decrease from a high temperature to a low temperature.
- the temperature of the metal tube constituting the outer wall first decreases, and the metal tube contracts due to this temperature decrease. Thereafter, the temperature of the sheath disposed inside starts to decrease, and the sheath begins to contract.
- the timing at which the contraction of the metal tube begins is different from the timing at which the sheath disposed inside the metal tube begins to contract.
- the sheath remains in an expanded state due to heat.
- the shrinkage of the metal tube is transmitted to the element electrode wire and sheath of the temperature sensing element through the cement filled therein, and stress is applied to the joint portion of these members, which may cause the joint portion to be cut. sell.
- a temperature sensor having a configuration in which cutting of a joint portion of a temperature sensitive element due to thermal stress is suppressed.
- the temperature sensor includes a temperature sensitive element, a sheath portion, a surrounding portion, and a holding member.
- the temperature sensitive element has a temperature sensing element and an element electrode line.
- the sheath part includes a sheath core wire joined to the element electrode wire.
- the surrounding portion has a cylindrical shape having a bottom portion on the distal end side and extending in the axial direction, and accommodates at least the temperature-sensitive element in its own internal space and includes a joint portion between the element electrode wire and the sheath core wire.
- a holding member is arrange
- An air bubble is provided on the tip side of the temperature sensing element in the surrounding portion.
- the temperature sensor is configured so that the air bubbles enclose at least the front end surface of the temperature sensing body when viewed from the front end side of the surrounding portion in a direction along the axis.
- the air bubbles are formed as spaces that do not contain solids or liquids, and may be formed as spaces that contain gas (such as the atmosphere), or may be formed as vacuum spaces. Also good.
- the thermal stress applied to the temperature sensing element, the sheath core wire, and the joint portion is formed by the air bubbles present on the tip side of the temperature sensing body so as to enclose the tip surface of the temperature sensing element.
- the holding member When the surrounding portion is thermally contracted due to a temperature drop, the holding member is pushed to the rear end side by the bottom of the surrounding portion. At this time, if air bubbles are present on the leading end side of the temperature sensing element, the pushing to the rear end side of the holding member is absorbed by the air bubbles. As a result, since the temperature-sensitive element is not pushed into the rear end side, the thermal stress acting on the junction between the element electrode wire and the sheath core wire is reduced. If air bubbles are formed so that at least the front end surface of the temperature sensing element is included, the above effect is exhibited. In addition, air bubbles may be formed so that the tip-facing surface of the temperature sensing element is included when viewed in a direction along the axis from the tip side of the surrounding portion. Thereby, the said effect is exhibited more.
- the holding member may be in contact with an inner wall surface of the bottom portion of the surrounding portion.
- the bottom part which is the front-end
- a heat conduction path is formed from the bottom of the enclosure part to the temperature sensing element via the holding member, and the response speed as a temperature sensor is easily improved.
- the air bubbles are arranged from the tip-facing surface of the temperature sensing element to the side periphery, and the dimension from the temperature sensing element to the tip side boundary of the air bubbles is the temperature sensing element. To a side boundary of the air bubbles. Thereby, the space by an air bubble is securable on the front end side of a temperature sensing element. As a result, a sufficient space for absorbing the contraction of the holding member in the axial direction can be secured, and the stress due to the contraction can be easily absorbed.
- the bottom portion has a curved shape, and one continuous air bubble is formed from the bottom portion to the boundary between the cylindrical cylindrical surface of the surrounding portion and the bottom portion. May be.
- the air bubbles provided in the region from the bottom of the surrounding portion to the boundary with the bottom of the cylindrical cylindrical surface absorb the pushing to the rear end side of the holding member due to the thermal contraction of the surrounding portion, The thermal stress acting on the joint between the electrode wire and the sheath core wire is reduced.
- discontinuous air bubbles are formed by forming one continuous air bubble from the bottom of the enclosure to the boundary between the cylindrical cylindrical surface and the bottom. Pushing to the rear end side of the holding member is easily absorbed, and thermal stress acting on the joint between the element electrode wire and the sheath core wire is easily reduced.
- the bottom portion may have a curved shape, and one continuous air bubble from the bottom portion to the end portion on the distal end side of the temperature sensing element may be formed.
- one continuous air bubble from the bottom portion to the end portion on the distal end side of the temperature sensing element may be formed.
- the air bubbles provided in the region from the bottom of the surrounding part to the end part on the front end side of the temperature sensing element absorb the pushing to the rear end side of the holding member due to the thermal contraction of the surrounding part, and the element electrode wire
- the thermal stress acting on the joint between the sheath core wire and the sheath core wire is reduced.
- by forming one continuous bubble from the bottom of the enclosure to the end of the temperature sensing element it is retained compared to when discontinuous bubbles are formed. Pushing to the rear end side of the member is easily absorbed, and thermal stress acting on the joint portion between the element electrode wire and the sheath core wire is easily reduced.
- the air bubbles present on the distal end side of the temperature sensing element are formed so as to enclose the distal end surface of the temperature sensing element, thereby acting on the junction between the element electrode wire and the sheath core wire. It becomes easy to reduce thermal stress, and there is an effect that it is possible to suppress the occurrence of malfunction of the temperature sensitive element due to thermal stress.
- FIG. 3 is an explanatory diagram showing the positional relationship of a small diameter portion, air bubbles, and a temperature sensing portion as projected onto a III-III cross section of FIG. 2 from the front end of the metal tube toward the rear end side in the axial direction. It is a figure explaining the filling method of the cement in a metal tube. It is sectional drawing explaining the other example of the internal structure of FIG. It is sectional drawing explaining the internal structure of the metal tube front end side of the temperature sensor which is a modification of the 1st Embodiment of this invention.
- FIG. 7A is a schematic diagram illustrating the configuration of the temperature sensing element of FIG. 6, and FIG. 7B is a cross-sectional view taken along the line VIIB-VIIB in FIG. 7A. It is sectional drawing explaining the internal structure of the metal tube front end side of the temperature sensor which is the 2nd Embodiment of this invention.
- the temperature sensor 1 of the present embodiment is used for detecting the temperature of a measurement target gas (exhaust gas) by being mounted in a flow pipe such as an exhaust pipe of an internal combustion engine so as to be arranged in the flow pipe through which the measurement target gas flows.
- the temperature sensor 1 is mainly provided with a thermistor element (temperature sensing element) 10, a sheath part 20, a metal tube (enclosure part) 30, an attachment part 50, and a nut part 60.
- the thermistor element 10 is a temperature-sensitive element arranged in a flow pipe through which a measurement target gas flows, and is arranged inside the metal tube 30.
- a temperature sensing part (temperature sensing element) 11 which is a thermistor sintered body whose electrical characteristics (electrical resistance value) change with temperature, and changes in electrical characteristics of the temperature sensing part 11 are extracted.
- a pair of electrode wires (element electrode wires) 12 are provided.
- the sheath portion 20 is for insulatingly holding a pair of metal core wires (sheath core wires) 21 inside the outer cylinder 22.
- the sheath portion 20 has a metal outer tube 22, a pair of metal core wires 21 made of a conductive metal, and the outer tube 22 and the two metal core wires 21 that are electrically insulated from each other, thereby providing the metal core wire 21. And holding insulating powder (not shown).
- the metal tube 30 is a member formed by closing the distal end side of a cylindrical member extending in the axial direction, and is formed from a corrosion-resistant metal (for example, a stainless alloy such as SUS310S which is also a heat-resistant metal). is there.
- the metal tube 30 is formed in a cylindrical shape extending in the axial direction in which the tube tip (bottom) 31 is closed by deep drawing of a steel plate, and is formed in a shape in which the cylindrical tube rear end is opened.
- the axial dimension of the metal tube 30 is set so that the tube rear end side comes into contact with the inner surface of the second step portion 55 of the mounting portion 50.
- the tube tip 31 of the metal tube 30 is formed in a curved shape.
- the thermistor element 10 and cement (holding member) 40 are disposed inside the metal tube 30.
- a small diameter portion 32 is formed at the distal end portion, and a large diameter portion 33 having a diameter larger than that of the small diameter portion 32 is formed on the rear end side.
- the small diameter portion 32 and the large diameter portion 33 are connected by a step portion 34.
- the cement 40 is filled around the thermistor element 10, and holds the thermistor element 10 and suppresses its swinging.
- a material having high thermal conductivity, high heat resistance, and high insulation may be used.
- oxides such as Al 2 O 3 and MgO, nitrides such as AlN, TiN, Si 3 N 4 and BN, and cements mainly composed of carbides such as SiC, TiC and ZrC, or Al 2 O 3 or Mainly oxides such as MgO, nitrides such as AlN, TiN, Si 3 N 4 and BN, and carbides such as SiC, TiC and ZrC, mixed with inorganic binders such as Al 2 O 3 , SiO2 and MgO Cement may be used.
- the mounting portion 50 is a member that supports the metal tube 30 and surrounds the outer peripheral surface on the rear end side of the metal tube 30 with at least the tip of the metal tube 30 exposed to the outside, and supports the metal tube 30.
- the mounting portion 50 is provided with a protruding portion 51 that protrudes radially outward, and a rear end-side sheath portion 52 that is located on the rear end side of the protruding portion 51 and extends in the axial direction.
- the protrusion 51 is an annular member provided with a mounting seat 53 on the tip side.
- the mounting seat 53 is a taper-shaped member whose diameter decreases toward the front end, and is a taper whose diameter increases toward the rear end formed at the sensor mounting position of the exhaust pipe (not shown). Corresponding to the shape of the path.
- the mounting seat 53 is in close contact with the tapered portion of the sensor mounting position, and suppresses leakage of exhaust gas to the outside of the exhaust pipe.
- the rear end side sheath portion 52 is a member formed in an annular shape.
- the rear end side sheath portion 52 includes a first step portion 54 located on the front end side and a second outer diameter smaller than the first step portion 54.
- a stepped portion 55 is formed.
- the nut part 60 has a hexagonal nut part 61 and a screw part 62.
- the axial direction is the longitudinal direction of the temperature sensor 1, and is the vertical direction in FIG.
- the front end side of the temperature sensor 1 is the lower side in FIG. 1, and the rear end side is the upper side in FIG.
- the metal core wire 21 has a tip portion electrically connected to the electrode wire 12 of the thermistor element by a welding point (joint portion) 15 and a rear end portion connected to the crimping terminal 23 by resistance welding. is there. That is, the rear end of the metal core wire 21 is connected to an external circuit, for example, a lead wire 24 for connection such as an electronic control unit (ECU) of a vehicle via a crimping terminal 23.
- ECU electronice control unit
- the pair of metal core wires 21 are insulated from each other by an insulating tube 25, and the pair of crimping terminals 23 are also insulated from each other by the insulating tube 25.
- the lead wire 24 is obtained by coating a conductive wire with an insulating coating material, and the lead wire 24 is disposed through the inside of an auxiliary ring 26 made of heat-resistant rubber.
- air bubbles 70 are formed on the distal end side (left side in FIG. 2) of the temperature sensing unit 11.
- the air bubble 70 is formed as a space that does not contain a solid or a liquid, and may be formed as a space that contains a gas (such as the atmosphere) or may be formed as a vacuum space. Good.
- the air bubble 70 has a size that encloses the tip-facing surface 11 ⁇ / b> B including the tip surface 11 ⁇ / b> A of the temperature sensing unit 11.
- 11 A of front end surfaces of the temperature sensing part 11 are side surfaces arrange
- the tip-facing surface 11 ⁇ / b> B refers to all side surfaces that appear on the tip side and are visible when the temperature sensing unit 11 is viewed from the tip side along the axial direction L.
- three side surfaces including a pair of side surfaces adjacent to the front end surface 11A and the front end surface 11A serve as the front end facing surface 11B.
- a pair of side surfaces orthogonal to the axial direction L correspond to an example of the “side circumferential portion” of the present invention.
- the cement 40 is filled so as to be in contact with the other four side surfaces corresponding to an example of the “side peripheral portion” of the present invention.
- the temperature-sensitive part 11 is described as being applied to an example in which the height is low, but the shape of the temperature-sensitive part 11 is not limited to a hexagonal column, It may be a prismatic column or a cylinder.
- the diameter of the air bubble 70 is controlled by adjusting the tip position of the filling needle 75 that fills the cement 40 in the metal tube 30.
- the relative tip position of the filling needle 75 with respect to the metal tube 30 can be adjusted by moving according to the filling state of the cement 40.
- the diameter of the bubble 70 is increased by moving the tip of the filling needle 75 to the rear end side of the metal tube 30 at a relatively high speed.
- the diameter of the bubble 70 is reduced by slowing the moving speed of the filling needle 75.
- the cement 40 when the cement 40 is filled, it is a sublimation material that volatilizes at a relatively low temperature (for example, 900 ° C. or less) such as carbon, theobromine, and various organic binders, and disappears in the process of cement 40 solidifying.
- a material that forms a void in the cement 40 may be disposed inside the metal tube 30. The void formed in this way becomes the above-described air bubble 70.
- the air bubble 70 existing on the distal end side of the temperature sensing unit 11 is from the tube distal end 31 of the metal tube 30 to the first reference plane that is a boundary between the cylindrical surface of the metal tube 30 and the tube distal end 31. It may be formed as one continuous air bubble 70 up to L1.
- the air bubble 70 existing on the tip side of the temperature sensing unit 11 is a second tip which is an end part on the tip side of the temperature sensing unit 11 of the thermistor element 10 from the tube tip 31 of the metal tube 30. It may be formed as one continuous bubble 70 up to the reference plane L2.
- the air bubble 70 present on the distal end side of the temperature sensing unit 11 is formed so as to enclose the distal end surface 11 ⁇ / b> A of the temperature sensing unit 11. It is possible to reduce the thermal stress applied to the welding point 15 that is a joint between the wire 12 and the metal core wire 21. That is, when the temperature sensor 1 in the high temperature state is shifted to the low temperature state, the temperature of the metal tube 30 exposed to the outside first decreases, and then the cement 40 disposed in the internal space of the metal tube 30 or The temperature of the thermistor element 10, the electrode wire 12, and the metal core wire 21 is lowered.
- the cement 40 When the metal tube 30 is thermally contracted due to a temperature drop, the cement 40 is pushed to the rear end side by the tube tip 31 of the metal tube 30. At this time, if air bubbles 70 exist on the front end side of the temperature sensing unit 11, the air bubbles 70 absorb the pushing of the cement 40 toward the rear end side. As a result, since the temperature sensitive part 11 is not pushed into the rear end side, the thermal stress acting on the welding point 15 which is a joint part between the electrode wire 12 and the metal core wire 21 is reduced. The above effect is exhibited as long as the air bubble 70 is formed so that at least the front end surface 11A of the temperature sensing unit 11 is included, but the air bubble 70 is included so that the front end surface 11B of the temperature sensing unit 11 is included.
- one continuous bubble 70 from the tube tip 31 of the metal tube 30 to the first reference plane L1 that is the boundary between the cylindrical cylindrical surface and the tube tip 31 is formed.
- cement is formed by forming one continuous air bubble 70 from the tube tip 31 of the metal tube 30 to the first reference plane L1 as compared with the case where the discontinuous air bubble 70 is formed.
- 40 is easily absorbed by the rear end side, and it is easy to suppress the occurrence of malfunction of the thermistor element 10 due to thermal stress.
- one continuous air bubble 70 is formed from the tube tip 31 of the metal tube 30 to the second reference plane L ⁇ b> 2 that is the end portion on the tip side of the temperature sensing part 11. This makes it easier to reduce the thermal stress applied to the welding point 15 between the electrode wire 12 and the metal core wire 21.
- the air bubbles 70 provided in the region from the tube tip 31 of the metal tube 30 to the second reference plane L2 absorb the pushing of the metal tube 30 toward the rear end side of the cement 40 due to the thermal contraction of the metal tube 30. And the thermal stress acting on the welding point 15 between the metal core wire 21 is reduced.
- cement is formed by forming one continuous air bubble 70 from the tube tip 31 of the metal tube 30 to the second reference plane L2 as compared with the case where the discontinuous air bubble 70 is formed.
- 40 is easily absorbed by the rear end side, and it is easy to suppress the occurrence of malfunction of the thermistor element 10 due to thermal stress.
- the temperature sensor 1 corresponds to an example of a temperature sensor
- the thermistor element 10 corresponds to an example of a temperature sensing element
- the temperature sensing unit 11 corresponds to an example of a temperature sensing element
- the electrode wire 12 corresponds to an example of an element electrode wire.
- the sheath portion 20 corresponds to an example of the sheath portion
- the metal core wire 21 corresponds to an example of the sheath core wire
- the metal tube 30 corresponds to an example of the surrounding portion
- the tube tip 31 corresponds to an example of the bottom portion
- the welding point 15 corresponds to an example of the joint
- the cement 40 corresponds to an example of the holding member
- the air bubbles 70 correspond to an example of the air bubbles.
- FIGS. 6, 7A, and 7B a temperature sensor according to a modification of the first embodiment of the present invention will be described with reference to FIGS. 6, 7A, and 7B.
- the basic configuration of the temperature sensor of this embodiment is the same as that of the first embodiment, but the aspect of the temperature sensitive element is different from that of the first embodiment. Therefore, in the present embodiment, the configuration related to the temperature sensitive element will be described with reference to FIG. 6, FIG. 7A, and FIG. 7B, and description of other components and the like will be omitted.
- the temperature sensor 1 of the present modification is provided with a temperature sensitive element 10 ⁇ / b> P using a platinum resistor, a metal tube 30, and the like.
- the temperature sensing element 10P includes a ceramic substrate 14P having an alumina purity of 99.9%, a metal resistor 15P formed in a film shape on the surface of the ceramic substrate 14P, and a metal resistor 15P.
- a ceramic coating layer 17P having an alumina purity of 99.9% that covers the metal resistor 15P is provided on the surface opposite to the surface in contact with the ceramic substrate 14P.
- the metal resistor 15P is mainly composed of platinum (Pt), and the electric resistance value changes according to the temperature change.
- the ceramic coating layer 17P is a fired sheet obtained by firing a ceramic green sheet in advance, and is bonded to the tip side (left side in FIGS. 7A and 7B) of the ceramic substrate 14P fired by the bonding layer 16P. Thus, the metal resistor 15P is provided in a state of covering the tip side.
- the bonding layer 16P is also configured with an alumina purity of 99.9%.
- the bonding layer 16P is a paste containing alumina powder before bonding. After the sintered ceramic base 14P and the ceramic coating layer 17P are bonded to each other with the paste, the bonding layer 16P is finally bonded by heat treatment. It becomes the layer 16P.
- the rear end side (the right side in FIGS. 7A and 7B) of the metal resistor 15P is connected to the lead lead wire 21P through the thick film pad 18P, and then the connection portion is fixed by the lead wire fixing material 19P. As a result, the lead wire 21P is electrically connected.
- the temperature sensing element 10P configured in this way is electrically connected to an external device or the like via the lead lead wire 21P.
- the configuration in which the lead wire 21P is removed from the temperature sensing element 10P corresponds to an example of the “temperature sensing element” of the present invention.
- the side surface located between the end on the tip side facing the tube tip 31 in the temperature sensing element 10P and the end on the rear end side to which the lead wire 21P is connected is the “side” of the present invention. It corresponds to an example of “peripheral part”.
- the cement 40 is filled so as to be in contact with the side surface corresponding to an example of the “side peripheral portion” of the present invention.
- the ceramic substrate 14P, the ceramic coating layer 17P, and the bonding layer 16P of the temperature sensitive element 10P are configured with an alumina purity of 99.9% or more (99.9% in this embodiment), and are excellent in migration resistance.
- the temperature sensor 1 can suppress the deterioration of the metal resistor 15P due to the influence of the object to be measured, and suppress the occurrence of migration due to components other than alumina contained in the ceramic base 14P, the ceramic coating layer 17P, and the bonding layer 16P. Therefore, even when exposed to a high temperature environment (for example, 1000 [° C.]), the electric resistance value of the temperature sensitive element 10P is less likely to fluctuate, and a decrease in temperature detection accuracy can be suppressed.
- a high temperature environment for example, 1000 [° C.]
- the cement 40 is disposed inside the metal tube 30 in a state of being in contact with the temperature sensing element 10P and the metal tube 30, the temperature sensing element 10P is supported by the metal tube 30 via the cement 40. Provided. For this reason, even in a use environment that easily receives external force such as vibration, the collision between the temperature sensing element 10P and the metal tube 30 can be suppressed, and the damage of the temperature sensing element 10P due to the collision with the metal tube 30 can be suppressed.
- the temperature sensitive element 10P is supported by the metal tube 30 via the cement 40, the movement of the relative position of the temperature sensitive element 10P with respect to the metal core wire 21 can be suppressed, and the temperature sensitive element 10P and the metal core wire 21 can be suppressed. It can suppress that a connection part disconnects.
- the temperature sensing element 10P is provided inside the metal tube 30, water drops or the like do not directly adhere to the temperature sensing element 10P. Therefore, the temperature sensing element 10P is caused by the uneven temperature distribution due to the adhesion of water drops. Damage such as cracking can be suppressed.
- thermosensor according to a second embodiment of the present invention will be described with reference to FIG.
- the basic configuration of the temperature sensor of the present embodiment is the same as that of the first embodiment, but the form of air bubbles is different from that of the first embodiment. Therefore, in this embodiment, the form of an empty bubble is demonstrated using FIG. 8, and description of other components etc. is abbreviate
- the thermistor element 10 and the cement 40 are arranged inside the metal tube 30 of the thermistor element 10 of the temperature sensor 101 of the present embodiment.
- the cement 40 is filled in the metal tube 30 so as to contact the inner wall surface of the tube tip 31 of the metal tube 30.
- at least the cement 40 is filled between the inner wall surface of the tube tip 31 and an air bubble 170 described later.
- the side surface located between the end portion on the tip side facing the tube tip 31 in the temperature sensing portion 11 and the end portion on the rear end side to which the electrode wire 12 is connected is the “side peripheral portion” of the present invention. Is equivalent to an example.
- the cement 40 is filled so as to be in contact with at least a part of the side surface corresponding to an example of the “side circumferential portion” of the present invention.
- an air bubble 170 is formed in the cement 40 on the tip side (the left side in FIG. 8) of the temperature sensing part 11.
- the air bubbles 170 are formed so as to enclose the cement 40 and the temperature sensing part 11 and not to enclose the inner wall surface of the tube tip 31.
- the air bubbles 170 are arranged from the front end surface 11A of the temperature sensing unit 11 to the side surface.
- the dimension Lx from the temperature sensing part 11 to the front end side boundary of the air bubble 170 and the dimension Ly from the temperature sensing part 11 to the side side boundary of the air bubble 170 satisfy the relationship Lx> Ly.
- a temperature sensing part 11 having a tip coated with a sublimation material is prepared.
- the coating is performed by a method in which the tip of the temperature sensing unit 11 is immersed in a liquid of a sublimation material, or a method in which a sublimation material is sprayed on the tip of the temperature sensing unit 11.
- the prepared temperature sensing part 11 is inserted in the cement 40 with which the metal tube 30 was filled.
- the prepared temperature sensing part 11 is placed in the metal tube 30 and then the cement 40 is filled in the metal tube 30.
- the sublimation material is sublimated in the process of solidifying the cement 40 by firing. A space from which the sublimation material has been removed is formed as an air bubble 170.
- the centrifugal defoaming treatment may be performed after the temperature sensing portion 11 and the cement 40 are disposed in the metal tube 30 and before the cement 40 is solidified.
- the metal tube 30 is held so that the tube tip 31 is radially outward, and the metal tube 30 is rotated. Thereby, the centrifugal force toward the tube tip 31 acts on the cement 40, and the density of the cement 40 at the tube tip 31 is increased.
- the density of the cement 40 in the periphery of the temperature sensitive part 11 is increased, and the thermal conductivity in the periphery is increased. Furthermore, the retainability of the temperature sensing part 11 is also increased.
- the air bubbles 170 may be formed by using a sublimation material as described above, or by using a sublimation material and centrifugal defoaming treatment in combination, or the air bubbles 170 may be formed by reverse centrifugal defoaming treatment described below. It may be formed.
- the reverse centrifugal defoaming process after the temperature sensing unit 11 and the cement 40 are arranged in the metal tube 30, the metal tube 30 is held so that the tube tip 31 is at the center of rotation, and the metal tube 30 is rotated. As a result, a centrifugal force acts on the cement 40 in a direction away from the tube tip 31, and the cement 40 is separated from the tube tip 31, thereby creating a space in the vicinity. Finally, the cement 40 is solidified in the process of solidifying the cement 40 by firing, and the space is formed as an air bubble 170.
- the tube tip 31 and the cement 40 are in direct contact with each other.
- a heat conduction path from the tube tip 31 to the temperature sensing part 11 through the cement 40 is formed, and the response speed as a temperature sensor can be improved.
- a space by the air bubbles 170 can be secured on the tip side of the temperature sensing unit 11. As a result, a sufficient space for absorbing the shrinkage of the cement 40 in the axial direction L can be secured, and the stress due to the shrinkage can be absorbed.
- the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
- the present invention is not limited to those applied to the above-described embodiments, and may be applied to embodiments obtained by appropriately combining these embodiments, and is not particularly limited.
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Abstract
Description
感温素子は、感温体および素子電極線を有する。シース部は、前記素子電極線に接合されるシース芯線を内包する。包囲部は、先端側に底部を有して軸線方向に延びる筒形状をなし、自身の内部空間に、少なくとも、前記感温素子を収容すると共に前記素子電極線と前記シース芯線との接合部を収容する。保持部材は、前記内部空間に配置され、前記感温体のうち、先端側の端部と後端側の端部との間に位置する側周部の少なくとも一部に接する。
この温度センサは、前記包囲部の先端側から前記軸線に沿う方向に投影して見たときに、前記空泡は、少なくとも前記感温体の先端面を内包するように構成されている。
この発明の第1の実施形態に係る温度センサについて、図1から図4および図5A,図5Bを参照しながら説明する。
金属チューブ30の内部に充填されたセメント40には、図2に示すように、感温部11の先端側(図2の左側)に空泡70が形成されている。空泡70は、固体や液体を内部に含まない空間として形成されており、例えば、ガス(大気など)を内部に含んだ空間として形成してもよく、あるいは、真空の空間として形成してもよい。空泡70は、図3に示すように、感温部11の先端面11Aを含む先端向き面11Bを内包する大きさを有している。
温度センサ1が温度センサの一例に相当し、サーミスタ素子10が感温素子の一例に相当し、感温部11が感温体の一例に相当し、電極線12が素子電極線の一例に相当する。
次に、本発明の第1の実施形態の変形例に係る温度センサついて図6および図7A,図7Bを参照しながら説明する。本実施形態の温度センサの基本構成は、第1の実施形態と同様であるが、第1の実施形態とは、感温素子の態様が異なっている。よって、本実施形態においては、図6および図7A,図7Bを用いて感温素子に関する構成などについて説明し、その他の構成要素等の説明を省略する。
感温素子10Pは、図7Aおよび図7Bに示すように、アルミナ純度99.9%のセラミックス基体14Pと、セラミックス基体14Pの表面に膜状に形成される金属抵抗体15Pと、金属抵抗体15Pのうちセラミックス基体14Pと接する面とは反対側の面において金属抵抗体15Pを被覆するアルミナ純度99.9%のセラミックス被覆層17Pと、を有している。
セラミックス被覆層17Pは、セラミックスのグリーンシートを予め焼成することで得られた焼成済みのシートであり、接合層16Pにより焼成済みのセラミックス基体14Pの先端側(図7A,図7Bにおける左側)に接合されて、金属抵抗体15Pの先端側を覆う状態で備えられている。
次に、本発明の第2の実施形態に係る温度センサついて図8を参照しながら説明する。本実施形態の温度センサの基本構成は、第1の実施形態と同様であるが、第1の実施形態とは、空泡の形態が異なっている。よって、本実施形態においては、図8を用いて空泡の形態について説明し、その他の構成要素等の説明を省略する。
Claims (6)
- 温度センサであって、
感温体および素子電極線を有する感温素子と、
前記素子電極線に接合されるシース芯線を内包するシース部と、
先端側に底部を有して軸線方向に延びる筒形状をなし、自身の内部空間に、少なくとも、前記感温素子を収容するとともに前記素子電極線と前記シース芯線との接合部を収容する包囲部と、
前記内部空間に配置され、前記感温体のうち、先端側の端部と後端側の端部との間に位置する側周部の少なくとも一部に接する保持部材と、
が設けられ、
前記包囲部の内部のうち前記感温体の先端側には空泡が備えられており、
前記包囲部の先端側から前記軸線に沿う方向に投影して見たときに、前記空泡は、少なくとも前記感温体の先端面を内包する温度センサ。 - 前記包囲部の先端側から前記軸線に沿う方向に投影して見たときに、前記空泡は、少なくとも前記感温体の先端向き面を内包する請求項1記載の温度センサ。
- 前記保持部材は、前記包囲部における前記底部の内壁面に当接している請求項1または2に記載の温度センサ。
- 前記空泡は、前記感温素子の前記先端向き面から前記側周部にわたって配置され、前記感温素子から前記空泡の先端側境界までの寸法は、前記感温素子から前記空泡の側方側境界までの寸法よりも大きい請求項1から3のいずれか1項に記載の温度センサ。
- 前記底部は、曲面形状であり、
前記底部から、前記包囲部における筒形状の円筒面と前記底部との境界に至るまでの一つの連続的な前記空泡が形成されている請求項1または2に記載の温度センサ。 - 前記底部は、曲面形状であり、
前記底部から、前記感温体の先端側の端部に至るまでの一つの連続的な空泡が形成されている請求項1または2に記載の温度センサ。
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