• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to the resolution of a technical problem occurring in a high temperature temperature sensor (1, 2) in which platinum lead wires (6) are susceptible to breakage when used at elevated temperature. To solve this problem, an internal structure (8) made of ceramic is disposed inside an external structure (7) made of a metal, the internal structure (8) is fixed, only at its terminal part to the outer structure (7), and an insulating filling material (9) made of a ceramic adhesive or a ceramic powder compactly filled with high density is introduced inside the internal structure (8). ) and a part of the external structure (7) where the internal structure (8) is not present. With this configuration, the platinum lead wires (6) are much less likely to break.
    公开号:FR3016695A1
    申请号:FR1461280
    申请日:2014-11-21
    公开日:2015-07-24
    发明作者:Mitsuaki Mochizuki；Takashi Mihara
    申请人:Okazaki Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to a temperature sensor in which a platinum resistance thermometer element is housed in a metal outer structure, for use in a high temperature environment. BACKGROUND ART It is possible to measure a temperature using platinum resistance thermometer elements more precisely than with other temperature sensors such as thermocouples. Thus, platinum resistance thermometer elements are widely used when accurate measurement of temperature is required. As examples of commonly used platinum resistance thermometer elements there is an element in which a wound platinum resistance wire is housed in a ceramic insulator (Fig. 1 of JP S57126 035U) or an element in which a platinum resistance wire wound around a glass spool is coated with glass (Fig. 4 of JP S44-29 830B), or an element in which a thin layer of platinum is formed into a wire sinuous on a thin layer made of ceramic or the like to form a platinum resistance wire, and its surface is insulated with a coating (JP 2003-179 276A). Since the electrical resistance of a platinum resistance wire changes as a function of temperature, the measurement of a temperature using a platinum resistance thermometer element is performed by measuring the electrical resistance of a resistance wire. in platinum and converting the value obtained into temperature. In a platinum resistance thermometer element, the platinum resistance wire is protected by an element made of a brittle material, such as ceramic or glass as described above. As a result, an external force, such as vibration, can damage the protective element, resulting in a break or short circuit of the platinum resistance wire. Therefore, it is unusual for a platinum resistance thermometer element to be used alone as a temperature sensor. The platinum resistance thermometer element 30 is usually used as a temperature sensor in a form in which the resistance thermometer element is housed in an external structure made of a metal or the like, for example as described in the document Figure 4 is a cross-sectional view showing a structure widely used in a temperature sensor using a platinum resistance thermometer element. A temperature sensor 10 is designed in such a way that a platinum resistance thermometer element 4 is fixed through an insulating filler 90 into a metal outer structure 70. Whatever the type of the platinum resistance thermometer element 4, platinum lead wires 6 connected to a platinum resistance wire -are usually exposed at the output of a platinum resistance thermometer element main body 5 containing the resistance wire in platinum, and the ends of the platinum lead wires 6 are connected by welding at the ends 160 of the three electrically conductive wires 140 of a three-wire cable 30 for measuring the electrical resistance of the platinum resistance wire. Although Fig. 4 is a cross-sectional view, the platinum resistance thermometer element 4 and an envelope 130 of the cable 30 are shown as viewed from the outside for ease of viewing. In known manner, the types of temperature measurement using a platinum resistance thermometer element include a two-wire measurement, a three-wire measurement or a four-wire measurement, the three-wire measurement being the most widely used in the field. industrial. FIG. 4 shows a measurement box with three wires in which the three electrically conductive wires 140 of the cable 30 are connected to the platinum output wires 6 exposed at the output of the main body of the platinum resistance thermometer element 5 In the description below, a "high temperature temperature sensor" refers to a high temperature temperature sensor using a platinum resistance thermometer element. With regard to the insulating filling material 90, since a ceramic adhesive has excellent heat resistance and the same is true for a ceramic powder, a ceramic adhesive or a ceramic powder filled compactly with high density is used as an insulating filler 90 in a high temperature temperature sensor used in a high temperature range above 200 C. A ceramic powder is compactly filled at high density to obtain good thermal conduction so as not to decrease the temperature. speed of response when measuring a temperature. In addition, the cable 30, in the case of the temperature sensor for high temperature, is a cable MI in which the three electrically conductive wires 140 are housed via a ceramic powder in the envelope 130 configured by a metal sheath, so to obtain a good thermal resistance. It should be noted that the maximum temperature of a platinum resistance thermometer element, as defined by IEC and JIS, is 850 C.
    [0002] In addition, a "ceramic adhesive" refers to a ceramic based adhesive containing mainly ceramic. When a densely packed high density ceramic powder is used as an insulating filler 90, the ceramic powder can absorb moisture and its insulation resistance can deteriorate, causing errors in the measurement of temperature and, therefore, the metal outer structure 70 is usually provided with a lid, and the lid is welded or brazed to the outer structure 70 and the metal sheath of the cable 30, so that the ceramic powder is the inside is protected from outside air to prevent errors when measuring a temperature.
    [0003] Background Documents Patent Documents 1: JP H06-347 339A. DISCLOSURE OF THE INVENTION Problem solved by the invention The problem of high temperature temperature sensors having the conventional structure shown in Fig. 4 is that sometimes the platinum lead wires 6 break when used at high temperature. In addition, another problem with these temperature sensors is that the wires break more frequently when used in an environment where the temperature changes repeatedly and significantly between a high temperature and a low temperature. An object of the present invention is to provide a high temperature temperature sensor in which the risk of wire breakage is significantly lower than in conventional examples, even when used in a high temperature environment, particularly when used in an environment where the temperature changes repeatedly and significantly between high and low temperatures. Means of solving the problem In order to solve the problems described above, the following temperature sensor for high temperature is proposed. First aspect A first aspect of the present invention relates to a temperature sensor for high temperature, provided at one end with a MI cable in which electrically conductive wires are housed via an insulating inorganic powder in a metal sheath, comprising: an external structure made of a metal and having a tubular shape with a bottom; An internal structure made of ceramic, having a tubular shape with or without bottom and disposed inside the outer structure in a position in which the internal structure is substantially in contact, at an external lateral face of the structure internal, with an inner side face of the outer structure, and the inner structure is further substantially in contact, at a lower end face of the inner structure, with an inner face of a lower portion of the outer structure and the inner structure is attached to the outer structure at an upper end portion of the inner structure; a platinum resistance thermometer element disposed within the inner structure, constructed from a main body of the platinum resistance thermometer element containing a platinum resistance wire and platinum lead wires connected to the platinum resistance wire and partially exposed at the outlet of the main body of the platinum resistance thermometer element, wherein the ends of the platinum lead wires exposed at the output of the main body of the resistance thermometer element platinum are connected to electrically conductive wires 30 of the MI cable; and an insulating filler material made of ceramic adhesive or ceramic powder filled compactly with high density, and introduced into the internal structure and an inner part of the outer structure where the internal structure is not present. It should be noted, as described above, that a "ceramic adhesive" refers to a ceramic based adhesive containing mainly ceramic.
    [0004] After research and studies on the causes of the breakage of platinum lead wires exposed at the output of a platinum resistance thermometer element main body in conventional high temperature temperature sensors, it has been found that this rupture is mainly due to a difference between the coefficients of thermal expansion of a metallic external structure and platinum. As industrial products, the external structures of high temperature temperature sensors are made mostly of stainless steel and are sometimes made of a nickel alloy, such as the corrosion and heat resistant super alloy NCF. . These metals each have a coefficient of thermal expansion greater than that of platinum. In addition, a ceramic adhesive or ceramic powder used as an insulating filler has a thermal expansion coefficient lower than that of the material of the outer structure and close to that of platinum. Table 1 shows the approximate coefficients of thermal expansion of commonly used materials.
    [0005] Table 1 Outer material material: Ceramic material: coefficient of thermal expansion coefficient thermal expansion Stainless steel SUS304: 18 x 10-9 ° C Alumina: 8 x 10-6 / ° C Stainless steel SUS316: 18 x 10-6 / ° C Zirconia: 11 x 10-6 / ° C NCF600: 16 x 10-6 / ° C Magnesia: 13 x 10-6 / ° C Platinum (resistance wire, lead): coefficient of thermal expansion Platinum: 10 x 10-6PC According to the relationship between the thermal expansion coefficients of these constituent materials, when a conventional high temperature temperature sensor is used at a high temperature, the outer structure expands under the effect of heat and pulls on the material insulating filler having a small coefficient of thermal expansion and sometimes the insulating filler breaks. When the insulating filler material is pulled and broken, the platinum lead wires having a coefficient of thermal expansion less than that of the outer structure are drawn and a tensile stress is generated in the wires. The platinum lead wires break mainly because of this constraint. In addition, when used in an environment where the temperature changes repeatedly and significantly between a high temperature and a low temperature, the tensile stress mentioned above is generated repeatedly and a fatigue cycle is added and, as a result, the platinum lead wires break more frequently. The high temperature temperature sensor of the present invention comprises a ceramic inner structure and, therefore, there is much less risk of rupture of platinum lead wires than with conventional examples. The reason for this is that the internal structure and the insulating filling material inside the internal structure are not pulled by a significant thermal expansion of the external structure because the internal structure is fixed only at its upper end portion. to the external structure. The stress generated in the platinum lead wires is reduced because the ceramic, constituting wholly or just mainly the inner structure and the insulating filler material, has a coefficient of thermal expansion close to that of platinum, as can be seen in FIG. Table 1. Second aspect A second aspect of the present invention relates to the high temperature temperature sensor according to the first aspect, wherein a material forming the internal structure, and a main material forming the ceramic adhesive of the insulating filler material or a material forming the ceramic powder of the insulating filler material is any of alumina, zirconia and a mixture of alumina and zirconia. Not only is there no stress coming from the outer structure on the platinum lead wires because the internal structure is realized as described in the first aspect and, according to the second aspect, there is practically no stress coming from the material. insulating filler due to alumina and zirconia, the latter two materials, among ceramic materials, having a coefficient of thermal expansion particularly close to that of platinum, as can be seen in Table 1. Therefore, even when used in a high temperature environment or in an environment where the temperature changes repeatedly and significantly between a high temperature and a low temperature, the rupture of the platinum lead wires can be substantially avoided. It should be noted that, since the electric conductor wires of the MI cable used are large and have a relatively high coefficient of thermal expansion, the electrically conductive wires rarely break. The same applies to conventional high temperature temperature sensors. In addition, since the platinum resistance wire in the main body of the platinum resistance thermometer element is wound or sinuous, an external force is easily absorbed and this wire is less likely to break than the platinum lead wires. . Third aspect A third aspect of the present invention relates to the high temperature temperature sensor according to the second aspect, wherein a position in an axial direction of the upper end portion of the inner structure attached to the outer structure substantially corresponds to a position where the ends of the platinum output wires and the electrically conductive wires of the MI cable are connected to each other. According to the third aspect, a position in an axial direction of the upper end portion of the inner structure attached to the outer structure substantially corresponds to a position where the ends of the platinum lead wires and the electrically conductive wires of the MI cable are connected to each other. As a result, the risk of breakage of the electrically conductive wire of the MI cable, which only rarely occurs, is further reduced. The reason for this is that the stress generated in the MI lead wires for a high temperature is reduced when they are outside the internal structure, the stress being generated because the electrically conductive wires are formed usually from nickel or a nickel alloy, the latter having a coefficient of thermal expansion closer to that of the metal forming the outer structure than ceramic, such as alumina or zirconia. Fourth Aspect A fourth aspect of the present invention relates to the high temperature temperature sensor according to any of the first, second or third aspects, further comprising: an internal structure fastener which is made of a metal and which can press on an upper face of the internal structure; wherein the inner structure is provided on one outer face of the upper end portion thereof with a rim, the outer structure is provided on an inner face with an upper portion thereof with a by reducing the thickness of the wall of the upper part, and the upper end part of the internal structure is fixed to the external structure by welding or brazing of the internal structure of the fastening member and the external structure one on the other in a state where the rim of the internal structure rests on the step of the outer structure and the inner structure is suspended on the outer structure, and an upper face of the rim on the inner structure is pressed by the internal structure fastener. According to this aspect, the upper end portion of the inner structure can be easily attached to the outer structure. Fifth Aspect A fifth aspect of the present invention is the high temperature temperature sensor according to any one of the first, second or third aspects, further comprising: a cover which is made of a metal and which can be attached to a opening of an upper part of the external structure; wherein the inside of the outer structure is protected from outside air by welding or brazing the cover on the outer structure and the metal sheath of the MI cable.
    [0006] Since a metal cover attached to an opening of an upper part of the outer structure is welded or brazed to the outer structure and the metal sheath of the MI cable, the inside of the outer structure is protected from outside air. Therefore, even when a moisture absorbing ceramic powder is used as an insulating filler, it is impossible for moisture to be absorbed and to decrease the insulation performance, which causes errors when measuring a moisture content. temperature. Sixth Aspect A sixth aspect of the present invention relates to the high temperature temperature sensor according to any of the first, second or third aspects, further comprising: an internal structure fastener which is made of a metal and which can rely on an upper face of the internal structure; and a lid which is made of metal and which can be attached to an opening of an upper part of the outer structure; wherein the inner structure is provided on one outer face of an upper end portion thereof with a rim, the outer structure is provided in an inner face of an upper portion thereof with a step, by reducing the thickness of the wall of the upper part, and the upper end portion of the inner structure is attached to the outer structure, and the inside of the outer structure is protected from the outside air by welding or brazing the cover on the external structure and the metal sheath of the cable MI in a state where the rim of the internal structure rests on the step of the external structure and the internal structure is suspended on the outer structure, the fastening member of internal structure is placed on an upper face of the flange on the internal structure, the cover is fixed on an upper face of the internal structure fastening member and the upper face of the structural fastener internal re is pressed by the lid. The advantage of this aspect is that the process which makes it possible to weld or braze the internal structure fastener on the external structure is no longer necessary.
    [0007] Seventh Aspect A seventh aspect of the present invention relates to the high temperature temperature sensor according to the sixth aspect, wherein the internal structure fastener is integrally formed with the internal structure.
    [0008] Not only is the process which makes it possible to weld or braze the internal structure fastener on the external structure is no longer necessary, but according to this aspect, the configuration can also be advantageously achieved economically because the number of constituent elements is reduced by the formation of the internal structure fastener in one piece with the internal structure. Eighth Aspect An eighth aspect of the present invention relates to the high temperature temperature sensor according to any of the first, second or third aspects, wherein the platinum resistance thermometer element disposed within the internal structure. is designed from a plurality of platinum resistance thermometer elements which are connected in series by a platinum wire. Effects of the Invention The present invention provides a high temperature temperature sensor with which the risk of breakage of the platinum lead wires is much lower than with conventional examples when used at high temperature and furthermore , the risk of breakage of the platinum lead wires is much lower than with conventional examples even when used in an environment where the temperature changes repeatedly and significantly between high temperature and low temperature. Description of the Figures Fig. 1 is a cross-sectional view showing a first embodiment of a high temperature temperature sensor according to the present invention. Fig. 2 is a cross-sectional view showing a second embodiment of the temperature sensor for high temperature.
    [0009] Figure 3 is a cross-sectional view in the radial direction of a MI cable which is connected to the temperature sensor for elevated temperature. Fig. 4 is a cross-sectional view showing a conventional temperature sensor using a platinum resistance thermometer element. Embodiments First Embodiment Fig. 1 shows a first embodiment of a high temperature temperature sensor according to the present invention. Although Fig. 1 is a cross-sectional view, a platinum resistance thermometer element main body 5 is shown as viewed from the outside. In addition, Figure 3 shows a cross-sectional view in the radial direction of an MI cable 3 which is connected to the temperature sensor 1 for high temperature. Hereinafter the first embodiment will be described with reference to FIGS. 1 and 3. The temperature sensor 1 for high temperature is designed from a platinum resistance thermometer element 4, an internal structure 8, an external structure 7 and an internal structure fixing member 11, and is disposed at one end of the cable MI 3. The outer structure 7 is made of a metal and has a cylindrical shape with a bottom to inside which the internal structure 8 is located. The external lateral face of the internal structure 8 is substantially in contact with the internal lateral face of the external structure 7, and the lower end face of the internal structure 8 is substantially in contact with the internal face of the lower part of the structure. 7. The platinum resistance thermometer element 4, in which the platinum lead wires 6 are exposed at the output of the main body of the platinum resistance thermometer element 5, is positioned inside the platinum resistance thermometer element 4. the internal structure 8. The main body of the platinum resistance thermometer element 5 is a part containing a platinum resistance wire for measuring the temperature. In the drawing are shown exposed portions of the platinum lead wires 6 connected to the platinum resistance wire. An annular flange protrudes from the upper end of the inner structure 8, and a step is formed in the inner face of the outer structure 7 by reducing the thickness of the wall of the upper part of the outer structure 7. In a state in which the rim of the internal structure 8 rests on the step of the inner face of the outer structure 7 and the inner structure 8 is suspended on the outer structure 7, the upper face of the rim is pressed by the metal member for fixing internal structure 11 in the form of a cylinder, so that the upper end portion of the internal structure 8 is fixed on the external structure 7. The internal structure fastening member 11 is fixed by welding on the external structure 7. The internal structure fastening member 11 may be soldered to the outer structure 7. The ends of the platinum lead wires 6 are connected by welding at the ends 16 d three electrically conductive wires 14 stripped of a metallic sheath 13 of the cable MI 3 in which the three electrically conductive wires 14 are housed via an insulating inorganic powder 15 in the metal sheath 13. The temperature is measured by the platinum resistance thermometer element 4 using a three-wire measurement and, therefore, the number of electrically conductive wires 14 of the MI 3 cable is three. The inside of the internal structure 8 and a part inside the external structure 7 where the internal structure 8 is not present are filled with an insulating filling material 9. In the first embodiment, the external structure 7 and the internal structure 8 each have a cylindrical shape, but may have a tubular shape with quadrangular section or another section, and the inner structure 8 may have a shape with a bottom. The shape of the internal structure fixing member 11 is absolutely not limited to a cylindrical shape, as long as the flange on the internal structure 8 can be fixed. In addition, the main body of the platinum resistance thermometer element 5 can be of any type, such as an element in which a wound platinum resistance wire is housed in a ceramic insulator, an element wherein a platinum resistance wire wound around a glass spool is coated with glass or an element in which a platinum thin film is formed as a sinuous wire on a thin layer made of ceramic or the like for form a platinum resistance wire, and its surface is insulated with a coating. In addition, the number of platinum resistance thermometer elements 4 is not limited to one and a plurality of platinum resistance thermometer elements may be electrically connected in series by a platinum wire. Five platinum resistance thermometer elements of 100 n connected in series correspond to a platinum resistance thermometer element of 500 n. In what follows, the materials used in an exemplary fabrication of this embodiment will be described. The outer structure 7, the inner structure fastener 11 and the metal sheath 13 are formed from NCF600, but they can be formed from another metal, such as SUS304 or SUS316 stainless steel. Electrically conductive yarns 14 are formed from a nickel alloy containing another trace metal, but they may be formed from another metal, such as NCF600. The insulating filler 9 is formed from a ceramic adhesive mainly made of alumina, and the inner structure 8 is formed from a ceramic made of alumina. Since alumina has a coefficient of thermal expansion close to that of platinum, breakage of platinum lead wires 6 can be effectively avoided. The insulating filling material 9 may be formed from a ceramic adhesive mainly made of zirconia or a mixture of alumina and zirconia, these, like alumina, have a coefficient of thermal expansion close to that of platinum. Alternatively, a ceramic powder made of alumina, zirconia or a mixture of alumina and zirconia compacted with high density can be used as an insulating filler 9. However, such a ceramic powder can absorb moisture and its insulation resistance may deteriorate, causing errors when measuring a temperature. Therefore, when the ceramic powder is used as an insulating filler 9, it is desirable that an opening at the top of the outer structure 7 is provided with a metal cover, and the cover is welded or brazed on the external structure 7 and the metal sheath 13 of the cable MI 3, so that the inside of the outer structure 7 is protected from the outside air. In addition, the inner structure 8 may be formed from a ceramic made of zirconia or a mixture of alumina and zirconia, these having a coefficient of thermal expansion close to that of platinum. The inorganic insulating powder of the MI 3 cable was made of magnesia, but it could be made of another material, such as alumina.
    [0010] In the temperature sensor 1 for high temperature of this embodiment, the internal structure 8 is fixed, only at its upper end portion, to the external structure 7. Therefore, when the external structure 7 and the internal structure 8 are heated and expand to different degrees, the internal structure 8 slides around its fixed part acting as a fulcrum, relative to the external structure 7. As a result, the internal structure 8 is not drawn by a significant thermal expansion of the external structure 7. That is to say that, unlike conventional examples in which a stress is generated in the platinum output son 6 under the influence of the thermal expansion of the outer structure 7, such a constraint is not generated in the platinum output wires 6 according to this embodiment. In addition, there is virtually no stress from the insulating filler 9 on the platinum lead wires 6 because the inner structure 8 and the insulating filler 9 are made or mainly made of alumina or zirconia, these having, among the ceramic materials, a coefficient of thermal expansion extremely close to that of platinum. Therefore, even when used in a high temperature environment or in an environment where the temperature changes repeatedly and significantly between a high temperature and a low temperature, the breakage of the platinum lead wires 6 can be largely avoided. Furthermore, also when the platinum resistance thermometer element 4 is designed from a plurality of platinum resistance thermometer elements which are electrically connected in series by a platinum wire, the breakage of this platinum wire Platinum can be largely avoided in a similar way.
    [0011] According to this embodiment, most of the electrically conductive wires 14 stripped from the metal sheath 13 of the cable MI 3 are inside the internal structure 8. The electrically conductive wires 14 are usually formed from of nickel or a nickel alloy, these having a thermal expansion coefficient close to that of the NCF600 or of a stainless steel forming the outer structure 7. However, these materials forming the electrically conductive yarns 14 have a thermal expansion coefficient greater than that of the materials constituting integrally or just mainly the internal structure 8 and the insulating filling material 9. On the other hand, the electrically conductive yarns 14 used are larger than the platinum output wires 6, and a tensile stress is barely generated so that the electrically conductive wires 14 will rarely break even when they are inside. of the inner structure 8 having a small coefficient of thermal expansion.
    [0012] In terms of thermal resistance, there are platinum resistance thermometer elements 4 that can be used at a high temperature of approximately 1000 C. If an increase in errors up to a certain point is allowed, and all the materials forming components other than the platinum resistance thermometer element 4 in the temperature sensor 1 for high temperature are heat resistant at a temperature of approximately 1000 C, then the temperature sensor 1 for high temperature can be used in a high temperature range up to approximately 1000 C. In addition, since the platinum resistance thermometer element 4, which is fragile, is protected by the metal outer structure 7, the temperature sensor 1 for high temperature can be used in an environment where an external force, such as vibration, is applied . Second Embodiment Fig. 2 shows a second embodiment of the high temperature temperature sensor according to the present invention. Although Fig. 2 is a cross-sectional view, the platinum resistance thermometer element main body 5 is shown as viewed from the outside. In addition, Figure 3 shows a cross-sectional view in the radial direction of an MI 3 cable which is connected to a temperature sensor 2 for high temperature. Hereinafter the second embodiment will be described with reference to Figures 2 and 3. Hereinafter a description relating the differences with respect to the first embodiment will be given. The features, effects and equivalents of the second embodiment other than the differences are similar to those of the first embodiment.
    [0013] As can be seen in FIG. 2, the second embodiment is different from the first embodiment in that a metal cover 12 is additionally provided as a constituent element and in that a position in the direction axial where the upper end portion of the inner structure 8 is fixed to the outer structure 7 largely corresponds to a position where the ends of the platinum lead wires 6 and the electrically conductive wires 14 of the cable MI 3 are connected to each other. to each other. The cover 12 is fixed by welding around its entire circumference to the outer structure 7 and the metal sheath 13 of the cable MI 3, so that the inside of the outer structure 7 is protected from the outside air. The attachment can be made not by welding around the entire circumference, but by brazing around the entire circumference. According to this embodiment, the inside of the outer structure 7 is protected from outside air. Therefore, even when a ceramic powder is used as an insulating filler 9, it is impossible for the moisture to be absorbed and to decrease the insulating capabilities, contrary to the first embodiment. In addition, unlike the first embodiment, in order to fix the upper end portion of the internal structure 8 to the outer structure 7, it is absolutely unnecessary to weld or braze the internal structure of the fastener 11 on the outer structure 7. In an exemplary embodiment of this embodiment; in a state where the internal structure fixing member 11 has been pressed by the cover 12 from above, the cover 12 has been welded to the outer structure 7 and the metal sheath 13 of the cable MI 3, so that the upper end portion of the inner structure 8 has been attached to the outer structure 7. A specific welding procedure is such that the cover 12 is first welded to the metal sheath 13, after which, in a state where the organ The internal structure fastener 11 is pressed by the cover 12 from above, the cover 12 is welded to the external structure 7. The internal structure fastener 11 is not welded or brazed to the external structure 7. The lid 12 is formed from NCF600, which is the same material constituting the outer structure 7, but it can be formed from another metal, such as SUS304 or SUS316 stainless steel. In addition, when welding or brazing on the outer structure 7 is not performed, the inner structure fastener 11 need not be made of a metal, and it can be made of ceramic.
    [0014] This embodiment is different from the first embodiment in that a position in the axial direction where the upper end portion of the inner structure 8 is fixed to the outer structure 7 corresponds largely to a position where the ends of the wires platinum output 6 and electrically conductive son 14 MI 3 cable are connected to each other. The electrically conductive wires 14 of the high temperature cable MI 3 are usually formed from nickel or a nickel alloy and, according to this embodiment, they are formed from a nickel alloy as described herein. -above. These materials each have a coefficient of thermal expansion closer to that of the metal forming the outer structure 7 than that of the ceramic, such as alumina or zirconia, constituting integrally or just mainly the internal structure 8 and the filling material. 9, and therefore, according to this embodiment, a stress generated in the electrically conductive wires 14 stripped of the metal sheath 13 of the cable MI 3 is reduced, and a break in the electrically conductive wires 14, which produced only rarely, can be avoided. This feature is also applicable to the first embodiment. That is to say, in FIG. 1 representing the first embodiment, if a position in the axial direction of the upper end portion of the internal structure 8 corresponds to a large extent to a position where the ends of the platinum outlet 6 and electrically conductive son 14 of MI 3 cable are connected to each other, a break of electrically conductive son 14, which occurs only rarely, can be avoided as in the second embodiment. It should be noted that, in the structure of the embodiment shown in FIG. 2, the internal structure fixing member 11 may be formed in one piece with the internal structure 8. In this case, the conductive wires of FIG. Electricity 14 stripped from the metal sheath 13 of the cable MI 3 are positioned inside the internal structure 8 made of ceramic and having a small coefficient of thermal expansion and, consequently, the effect of preventing a rupture of the Electrically conductive yarns 14 can not be obtained, but this configuration is advantageous from an economic point of view because the number of constituent elements is reduced. According to this embodiment, the platinum output wires 6 do not break as in the first embodiment. Furthermore, also in the case where the platinum resistance thermometer element 4 is designed from a plurality of platinum resistance thermometer elements which are electrically connected in series by a platinum wire, this platinum wire is Platinum does not break as in the first embodiment.
    [0015] Thermal Cycling Test In order to verify the effects of the present invention, the high temperature temperature sensor 2 of the second embodiment shown in Fig. 2 was subjected to a thermal cycling test. The platinum resistance thermometer element 4 of the high temperature temperature sensor 2 under test was formed as follows. Namely, five platinum resistance thermometer elements of 10012, in each of which a platinum thin film in the form of a sinuous wire was formed on a thin layer made of ceramic or the like to form a platinum resistance wire. , and whose surface was insulated by a coating, were electrically connected in series by a platinum wire, thereby forming the platinum resistance thermometer element 4. The outer structure 7 had an outer diameter of about 6 mm and a length in the axial direction of about 16 mm. The materials forming the building blocks were as described above. In summary, the outer structure 7, the inner structure fastener 11 and the cover 12 were formed from NCF600, the inner structure 8 was formed from a ceramic made of alumina and the material of Insulating filler 9 was formed from a ceramic adhesive mainly made of alumina. Six temperature sensors 2 for high temperature were prepared and were all subjected to 2000 thermal cycles in which the temperature was increased and decreased several times between the ambient temperature and 930 C. With these thermal cycles, the output wires in In the six temperature sensors 2, none of the platinum lead wires 6 failed and no other parts failed or were damaged. These results confirm the effectiveness of the present invention.
    [0016] The embodiments described herein should be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description.
    [0017] Any modifications falling within the meaning and equivalence range of the claims are intended to be encompassed by them. Industrial Application The high temperature temperature sensor of the present invention is suitable as a sensor for measuring the temperature of an object in which the temperature is high and changes frequently. In particular, this temperature sensor may preferably be used as a temperature sensor for monitoring the temperature of a catalytic tank of a thruster motor fitted to a satellite, as a temperature sensor for controlling the temperature of a small electric furnace. in which the temperature changes significantly and for the temperature control of other devices of the same kind.
    [0018] Description of part numbers 1 Temperature sensor for high temperature (first embodiment) 2 Temperature sensor for high temperature (second embodiment) 3 MI cable 4 Platinum resistance thermometer element 5 Thermometer element main body with platinum resistance 6 Platinum output wire 7 External structure 8 Internal structure 9 Insulating filler 11 Internal structure fastener 12 Cover 13 Metallic sheath 14 Electrically conductive wire 15 Insulating inorganic powder
    权利要求:
    Claims (8)
    [0001]
    REVENDICATIONS1. Temperature sensor for high temperature (1,
    [0002]
    2), located at one end of an MI cable (3) in which electrically conductive wires (14) are housed via an insulating inorganic powder (15) in a metal sheath (13), comprising: an outer structure ( 7) made of a metal and having a tubular shape with a bottom; an internal structure (8) made of ceramic, having a tubular shape with or without a bottom and disposed inside the outer structure (7) in a position in which the internal structure (8) is substantially in contact, at the level of an outer side face of the inner structure, with an inner side face of the outer structure (7), and the inner structure is further substantially in contact, at a lower end face of the inner structure, with a inner face of a lower portion of the outer structure (7), and the inner structure is fixed at an upper end portion thereof to the outer structure (7); a platinum resistance thermometer element (4) disposed within the inner structure (8), constructed from a main body of the platinum resistance thermometer element (5) containing a platinum resistance thermometer element; platinum resistance and platinum lead wires (6) connected to the platinum resistance wire and partially exposed at the output of the main body of the platinum resistance thermometer element (5), wherein the ends of the lead wires platinum (6) exposed at the outlet of the main body of the platinum resistance thermometer element (5) are connected to the electrically conductive wires (14) of the MI cable (3); and an insulating filler material (9) made of a ceramic adhesive or ceramic powder compactly filled with high density, and introduced into the internal structure (8) and a part of the structure external (7) where the internal structure (8) is not present. The high temperature temperature sensor according to claim 1, wherein a material forming the inner structure (8), and a main material forming the ceramic adhesive of the insulating filler (9) or a powder-forming material. ceramic of the insulating filler (9) are any of alumina, zirconia and a mixture of alumina and zirconia.
    [0003]
    The high temperature temperature sensor according to claim 2, wherein a position in an axial direction of the upper end portion of the inner structure (8) attached to the outer structure (7) substantially corresponds to a position at which the ends platinum lead wires (6) and electrically conductive wires (14) of the MI cable (3) are connected to each other.
    [0004]
    The high temperature temperature sensor according to any one of claims 1 to 3, further comprising: an internal structure fastener (11) which is made of metal and which can press on an upper face of the internal structure (8); in which the inner structure (8) is provided, on an outer face of the upper end portion thereof, with a flange, the outer structure (7) is provided, on an inner face with an upper part of that a step, by reducing the thickness of the wall of the upper part, and the upper end portion of the inner structure (8) is fixed to the outer structure (7) by welding or brazing the internal structure fastening member (11) and outer structure (7) on one another in a state in which the flange of the inner structure (8) rests on the step of the outer structure (7) and the inner structure (8) is suspended on the outer structure (7), and an upper face of the flange on the inner structure (8) is pressed by the internal structure fastener (11).
    [0005]
    The high temperature temperature sensor according to any one of claims 1 to 3, further comprising: a cover (12) which is made of a metal and which can be attached to an opening of an upper part of the external structure (7); wherein the inside of the outer structure (7) is protected from outside air by welding or soldering the cover (12) to the outer structure (7) and the metallic sheath (13) of the MI cable (3).
    [0006]
    The high temperature temperature sensor according to any one of claims 1 to 3, further comprising: an internal structure fastener (11) which is made of a metal and which can be supported on an upper face the internal structure (8); and a lid (12) which is made of a metal and which can be attached to an opening of an upper part of the outer structure (7); wherein the inner structure (8) is provided on one outer face of an upper end portion thereof with a rim, the outer structure (7) is provided in an inner face with an upper portion of it, a step, by reducing the thickness of the wall of the upper part, and the upper end portion of the inner structure (8) is attached to the outer structure (7), and the inside of the outer structure (7) is protected from the outside air by welding or brazing the cover (12) on the outer structure (7) and the metallic sheath (13) of the MI cable (3) in a state in which the flange of the inner structure (8) rests on the step of the outer structure (7) and the inner structure (8) is suspended on the outer structure (7), the inner structure fastening member (11) is placed on a upper face of the flange on the internal structure (8), the cover (12) is fixed on an upper face of the fastening member of internal structure (11) and the upper face of the internal structure fixing member (11) is pressed by the cover (12).
    [0007]
    The high temperature temperature sensor of claim 6, wherein the inner structure fastener (11) is integrally formed with the inner structure (8).
    [0008]
    The high temperature temperature sensor according to any one of claims 1 to 3, wherein the platinum resistance thermometer element (4) disposed within the inner structure (8) is constructed from a plurality of platinum resistance thermometer elements which are connected in series by a platinum wire.
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    同族专利:
    公开号 | 公开日
    JPWO2015111094A1|2017-03-23|
    FR3016695B1|2019-09-06|
    US20160018268A1|2016-01-21|
    JP5618310B1|2014-11-05|
    WO2015111094A1|2015-07-30|
    DE112014000282T5|2015-10-29|
    DE112014000282B4|2017-10-12|
    US9927303B2|2018-03-27|
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    法律状态:
    2015-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-29| PLSC| Publication of the preliminary search report|Effective date: 20160429 |
    2016-10-27| PLFP| Fee payment|Year of fee payment: 3 |
    2017-10-30| PLFP| Fee payment|Year of fee payment: 4 |
    2018-11-29| PLFP| Fee payment|Year of fee payment: 5 |
    2019-10-28| PLFP| Fee payment|Year of fee payment: 6 |
    2020-09-29| PLFP| Fee payment|Year of fee payment: 7 |
    2021-10-21| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/JP2014/000282|WO2015111094A1|2014-01-21|2014-01-21|Temperature sensor for high temperature|
    IBWOJP2014000282|2014-01-21|
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