JP2018096750A - Temperature measuring probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measuring probe that suppresses damage occurring during temperature measurement of molten metal.SOLUTION: A temperature measuring probe 1 measures a temperature of molten metal by dipping of a tip into the molten metal. The temperature measuring probe includes: temperature measuring means for measuring the temperature at the tip of the temperature measuring probe; an external protective pipe 4 that forms at least a part of an outer peripheral surface of the temperature measuring probe and is made of a ceramic accommodating the temperature measuring means in it; and a flange 5 that abuts on the external protective pipe and positions the external protective pipe. The external protective pipe 4 is supported by the flange 5 in a state in which the tip of the pipe is allowed to deviate in at least one of an axial direction, a radial direction, and a circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a temperature measuring probe for measuring the temperature of a molten metal.

  In the steelmaking factory, molten steel (molten steel) is processed into steel plates and steel bars with a continuous casting machine as the final process of refining. In the continuous casting method, molten steel in the ladle is collected in a tundish and poured into a continuous casting machine. For this reason, the temperature of molten steel in tundish not only affects product quality, but also affects the operating conditions of the casting machine. That is, the temperature of the molten steel is measured in order to determine the operating conditions. For the measurement of the molten steel temperature, for example, a temperature measuring probe described in Patent Document 1 is used.

  The temperature measuring probe described in Patent Document 1 has a thermocouple, a heat-resistant tube (inner protection tube) that houses the thermocouple, and a sleeve (outer protection tube) that houses the heat-resistant tube. Further, the sleeve is fixed to the flange and the support member by a mounting bracket. This temperature measuring probe measures temperature by immersing the tip in molten metal.

  A conventional temperature measuring probe is inserted into a hole opened in a container (a ladle or a tundish) for storing a molten metal, and the tip is immersed in the molten metal. At this time, the mounting bracket for fixing the sleeve is exposed in the container. The metal mounting bracket exposed in the container was exposed to high heat from the molten metal, and there was a risk of oxidation and melting. When oxidation or melting occurs in the mounting bracket, the shape of the mounting bracket itself cannot be maintained due to deterioration, and the ability to hold the sleeve decreases. When the mounting bracket cannot hold the sleeve, there is a problem that the metal fitting falls into the molten metal.

  Further, when the tip of the temperature measuring probe is immersed in the molten metal for temperature measurement, a force due to the flow rate of the molten metal itself is applied to the distal end portion of the temperature measuring probe. The force applied to the tip is applied in the direction in which the sleeve bends. The sleeve to which force is applied tends to be deformed along the direction in which the force is applied, but the proximal end is fixed by a mounting bracket. As a result, the force applied to the sleeve concentrates on the portion where the sleeve is fixed to the mounting bracket (contact point of the sleeve with the mounting bracket). There is a large difference in strength between the metal that forms the mounting bracket and the ceramic that forms the sleeve, and the partially concentrated force concentrates more on the sleeve side. There is a problem that this force causes damage to the temperature measuring probe such as breakage of the sleeve.

  In the conventional temperature measuring probe 1 whose configuration is shown in FIG. 10, when a force is applied to the tip, the contact with the mounting bracket 8 of the external protective tube 4 and the contact with the mounting bracket 8 of the internal protective tube 3 are applied. In the same way, there was a problem that the force concentrated and became the starting point of damage. Note that FIG. 10 is the same as the embodiment described later with respect to configurations (reference numerals) that are not particularly mentioned. Further, the member indicated by reference numeral 80 in FIG. 10 is a heat-resistant plate made of a heat insulating material such as ceramics for suppressing thermal damage of the flange 5.

  Further, when a force due to the flow of the molten metal is applied to the external protective tube 4, the load concentrates on the fixed portion where the internal protective tube 3 is fixed to the external protective tube 4, and the internal protective tube 3 (and the external protective tube) 4) has a problem of falling off the flange 5.

  In other words, the conventional temperature measuring probe has a problem that it easily breaks due to load concentration caused by the flow of the molten metal or deteriorates the mounting bracket when measuring the temperature of the molten metal.

JP 2001-304978 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the temperature measurement probe by which damage was suppressed.

  In order to solve the above problems, as a result of repeated studies on the structure of the temperature measuring probe, the present invention has been achieved.

  The temperature measuring probe of the present invention is a temperature measuring probe for measuring the temperature of the molten metal by immersing the tip in the molten metal, and a temperature measuring means for measuring the temperature at the tip of the temperature measuring probe, and an outer periphery of the temperature measuring probe. An external protective tube made of ceramics that forms at least a part of the surface and accommodates the temperature measuring means, and a flange that contacts the external protective tube and positions the external protective tube. The tip is supported by the flange in a state where displacement in at least one of the axial direction, the radial direction, and the circumferential direction is allowed.

  In the temperature measurement probe of the present invention, the external protective tube is configured to allow displacement. For this reason, even if the external protective tube is about to be displaced (bent), the stress is not concentrated on the external protective tube due to the displacement of the external protective tube. As a result, it is possible to prevent the external protective tube from being broken.

It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the latching structure of the external protective tube of the temperature measuring probe of 1st embodiment. It is the figure which showed the latching structure of the external protective tube of the temperature measuring probe of the modification of 1st embodiment. It is the figure which showed the latching structure of the external protective tube of the temperature measuring probe of 2nd embodiment. It is the figure which showed the structure of the temperature measuring probe of the example of 3rd embodiment. It is the figure which showed the latching structure of the internal protective tube of the temperature measuring probe of 3rd embodiment. It is the figure which showed the latching structure of the internal protective tube of the temperature measuring probe of 3rd embodiment. It is the figure which showed the latching structure of the external protection pipe | tube and internal protection pipe | tube of the temperature measuring probe of the modification of 3rd embodiment. It is the figure which showed the structure of the external protective tube of the conventional temperature measuring probe.

  The temperature measuring probe of the present invention measures the temperature of the molten metal by immersing the tip in the molten metal. The temperature measuring probe of the present invention measures the temperature of the molten metal, and the type of the molten metal to be measured is not limited at all. The temperature measuring probe of the present invention accumulates molten steel in the tundish and, when performing continuous casting by pouring the molten steel from the tundish to the mold, measures the temperature of the molten steel by immersing the tip in the molten steel in the tundish. Can be for

  The temperature measuring means is a means for measuring the temperature at the tip of the temperature measuring probe. The temperature measuring means is not particularly limited as long as it can measure the temperature. The temperature measuring means can be a thermocouple.

  The thermocouple is a member that actually measures the temperature. In the present invention, a thermocouple that can be used for measuring the temperature in the temperature range of the molten metal is appropriately selected. Examples of the thermocouple include platinum rhodium type, tungsten rhenium type, iridium rhodium type, alumel chromel type, nickel molybdenum type, and nicrosyl type.

  In the temperature measuring probe of the present invention, a platinum rhodium type thermocouple is preferably used for measuring the temperature of the molten steel. The platinum rhodium type thermocouple is a thermocouple in which the + side of the thermocouple is a platinum rhodium alloy and the-side is a platinum rhodium alloy or platinum. The specific composition of the platinum rhodium-type thermocouple can be a conventionally known composition.

  The external protective tube is a member made of ceramic that forms at least a part of the outer peripheral surface of the temperature measuring probe and accommodates the temperature measuring means therein. The external protective tube is a member with which the molten metal comes into contact when the tip of the temperature measuring probe is immersed in the molten metal. And the wear of the temperature measuring means etc. accommodated in the inside is suppressed and protected.

  The external protective tube accommodates the temperature measuring means inside. By housing the temperature measuring means inside, exposure of the temperature measuring means can be suppressed, and wear and the like of the temperature measuring means can be suppressed.

  The shape of the external protective tube is not limited, and the external protective tube can be formed in a shape such as a shape in which the end portion on the distal end side is closed in a state where the temperature measuring means is arranged inside. Moreover, when the temperature measuring means is accommodated in the internal protective tube, the internal protective tube may be arranged in a cylindrical shape (enclosed). That is, it is preferable that the temperature measuring means is accommodated in an internal protective tube whose tip is closed. Wearing of the temperature measuring means can be further suppressed by accommodating the temperature measuring means in the internal protective tube.

  The external protective tube is made of ceramics. The specific type of ceramic forming the external protective tube is not limited, and heat-resistant ceramics used in conventional temperature measuring probes can be used. Examples of the ceramic include at least one of alumina, alumina-carbon, magnesia, magnesia-carbon, silica, zirconia, zirconia-carbon, silicon carbide, silicon carbide-carbon, and the like. it can.

  The flange is a member that contacts the external protective tube and positions the external protective tube. The flange is a member that is assembled to a tundish or the like when the temperature of the molten metal is measured with a temperature measuring probe. That is, the external protective tube is fixed at a predetermined position via the flange.

  The material of the flange is not limited, and a conventionally known material can be used. The material may be any material as long as it can position the external protective tube and is not easily affected by the surrounding high heat when measuring the temperature of the molten metal, and may be a heat-resistant metal. An example of the heat-resistant metal is stainless steel.

In the temperature measuring probe according to the present invention, the outer protective tube is supported by the flange in a state where the distal end portion thereof is allowed to be displaced in at least one of the axial direction, the radial direction, and the circumferential direction.
Here, the support in a state in which the displacement is allowed indicates that the external protective tube can be displaced in each direction without losing the support from the flange. The permissible displacement in each direction includes not only the displacement of the tip in each of the axial direction, the radial direction, and the circumferential direction, but also a displacement in a direction combining these directions.

  In the temperature measuring probe of the present invention, even if a force from a molten metal or the like is applied to the temperature measuring probe, the external protective tube is displaced so that the force (load) applied to the temperature measuring probe is the base end portion of the external protective tube. I am no longer concentrating on. For this reason, the temperature measurement probe of the present invention can prevent breakage due to damage to the external protective tube.

In the temperature measuring probe according to the present invention, the outer protective tube has an enlarged diameter part in which at least a part of the outer diameter is enlarged, and the flange has an inner diameter shorter than the outer diameter of the enlarged diameter part, and the inside is based on the inside. It is preferable to have a through hole into which the external protective tube is inserted from the end side toward the tip side.
In the temperature measuring probe according to the present invention, the outer protective tube has an enlarged diameter portion in which at least a part of the outer diameter is enlarged, and the flange has an inner diameter smaller than the outer diameter on the proximal end side of the enlarged diameter portion. It is more preferable to have a cylindrical portion that defines a through-hole into which the external protective tube is inserted from the proximal end side toward the distal end side.

  Since the external protective tube has an enlarged diameter portion and the flange has a through hole, when the external protective tube is inserted into the through hole, the enlarged diameter portion of the external protective tube is caught by the short diameter of the through hole. . That is, the external protective tube is supported by the flange. At this time, the external protective tube is only supported by the flange, and the displacement with the through hole as a fulcrum is not regulated. That is, the external protective tube is supported by the flange in a state where displacement is allowed.

  In the present invention, the shape of the enlarged diameter portion is not limited as long as at least a part of the outer diameter is enlarged. Further, the diameter expansion amount of the expanded diameter portion is not limited, and even if the diameter expansion amount is constant in the circumferential direction and the axial direction of the outer protective tube, there are different diameter expansion amounts in the circumferential direction and the axial direction. You may do it.

  In the present invention, the enlarged diameter portion has one portion with the largest diameter between the end portions in the axial direction on the distal end side and the proximal end side, and from the largest diameter portion to the distal end side and the proximal end. It is preferable that the diameter gradually decreases toward the side. With this configuration, in the axial direction, a small-diameter portion is not formed between two large-diameter portions, and stress is not concentrated on the external protective tube. If a small-diameter portion is formed between two large-diameter portions in the axial direction, the load concentrates on the small-diameter portion, which becomes a starting point for destruction.

  In the present invention, the diameter-enlarged portion is a form in which the surface on the distal end side forms a plane perpendicular to the axial direction, or a form in which the outer diameter of the surface on the distal end side gradually decreases as it advances from the proximal end in the axial direction to the distal end. It is preferable that

  The form in which the diameter-expanded portion gradually decreases as the outer diameter of the surface on the distal end side advances from the proximal end in the axial direction to the distal end is not only in the direction in which the surface on the distal end side is perpendicular to the axial direction but also in the axial direction. Since it spreads, the surface area can be made wider than in the case where the surface on the tip side is a plane perpendicular to the axial direction. For this reason, the outer protective tube and the flange can be brought into contact with each other over a wider area, and partial concentration of force (load) does not occur, and damage to the temperature measuring probe and the outer protective tube can be suppressed.

  Here, in this embodiment, the shape of the diameter-enlarged portion that gradually decreases in diameter as the outer diameter of the distal-side surface progresses from the proximal end in the axial direction to the shape of the enlarged portion at two points that are different in axial position. The shape which the outer diameter in the point located in the side is larger than the outer diameter in the point located in the front end side is shown. That is, the degree of diameter expansion (shape) when proceeding from the distal end side to the proximal end side in the axial direction is not limited, and even if the change in diameter is a stepped change, a smooth inclination is obtained. Either a change made or a combination of these may be used.

  In this embodiment, the end portion on the distal end side of the enlarged diameter portion has a tapered shape. According to this tapered shape, this shape also serves as a guide when the external protective tube and the flange are assembled. That is, it can be easily assembled.

  In this form, it is more preferable that the change in the diameter of the surface on the tip side of the enlarged diameter portion is a smooth change. That is, it is preferable that the distal end side of the enlarged diameter portion has a truncated cone shape. If it becomes this shape, the change of an outer diameter will become smooth and a corner | angular part will not exist in a contact surface. For this reason, concentration of partial force (load) can be further suppressed.

  In this embodiment, it is preferable that the contacted surface that comes into contact with the enlarged diameter portion of the flange has a shape that substantially matches the surface on the proximal end side of the enlarged diameter portion. By making the abutted surface substantially coincide with the surface on the proximal end side of the enlarged diameter portion, the abutting area can be made wider.

  In the form in which the tip-side surface forms a plane perpendicular to the axial direction, the tip-side surface extends in a direction perpendicular to the axial direction. In this embodiment, both the contact surface of the external protective tube and the contacted surface of the flange can be flat, and both members can be brought into close contact with each other. That is, by bringing both members into contact with each other over a wider area, partial concentration of force (load) does not occur, and damage to the temperature measuring probe and the external protective tube can be suppressed.

  In this embodiment as well, it is preferable that the contacted surface that comes into contact with the enlarged diameter portion of the flange has a shape that substantially matches the surface on the proximal end side of the enlarged diameter portion. By making the abutted surface substantially coincide with the surface on the proximal end side of the enlarged diameter portion, the abutting area can be made wider.

  The temperature measuring probe of the present embodiment is used by immersing the temperature measuring portion at the distal end in molten metal, and is used in a state where the distal end is positioned below the base end. In this state, gravity acting in the downward (tip) direction acts on the external protective tube. Due to this gravity, the surface on the distal end side of the enlarged diameter portion of the external protective tube can come into contact with the flange. That is, even if the surface on the distal end side of the enlarged diameter portion is disposed so as to be separated from the flange, both are in contact with each other.

  In this embodiment, when the enlarged diameter portion of the external protective tube and the flange are joined in close contact with each other, a wide contact area can be ensured reliably, and partial concentration of force (load) does not occur. Damage to the temperature measuring probe and the external protective tube is suppressed.

  Further, in this embodiment, when the diameter-enlarged portion of the external protective tube and the flange are disposed so as to be separated from each other, the direction toward the proximal end in the axial direction of the temperature measuring probe is directed to the external protective tube (or the temperature measuring probe). When this force is applied, the axial force is prevented from accumulating by being separated, and damage to the external protective tube is suppressed. For this reason, in this embodiment, it is more preferable that the surface on the tip side of the enlarged diameter portion of the external protective tube and the flange are arranged so as to be separated from each other.

  In this embodiment, it is preferable that the external protective tube is inserted into the through hole opened in the flange, and the enlarged diameter portion is locked to the through hole. The external protective tube passes through the through hole of the flange. In this structure, a flange will be located over the perimeter of the outer periphery of an external protective tube. That is, the external protective tube can be supported in a state of being in contact with the entire circumference. In this configuration, the contact between the enlarged diameter portion and the flange is performed on the entire circumference in the circumferential direction, so that concentration of load applied at the time of contact does not occur.

  The outer protective tube inserted into the through hole opened in the flange has a large-diameter enlarged portion, and this enlarged portion is caught by the inner peripheral surface of the through-hole or the opening to be locked. . By this locking, the external protective tube is supported by the flange.

  The flange preferably has a cylindrical support portion (cylindrical portion) extending in the axial direction, and the inner peripheral surface of the support portion defines the through hole. In this configuration, the inner peripheral surface of the cylindrical support portion (cylindrical portion) can also be a contacted surface of the flange. That is, the contact area where the diameter-expanded portion and the flange abut can be increased.

  The cylindrical support portion (cylindrical portion) preferably has an inner peripheral shape that matches the outer peripheral shape of the contact surface of the enlarged diameter portion. By setting it as this structure, the contact area which a diameter-expanded part and a flange contact can be made wider.

  It is preferable that the cylindrical support portion has an inner peripheral shape in which the inner peripheral surface is located at a position spaced apart from the surface of the enlarged diameter portion. With this configuration, a gap is formed between the enlarged diameter portion and the flange, and the flange does not restrict minute displacement of the external protective tube. In other words, when a force in the direction toward the proximal end in the axial direction of the temperature measuring probe is applied to the external protective tube (or temperature measuring probe), the axial force is prevented from accumulating by separating. The external protective tube is prevented from being damaged.

  It is preferable that the end portions on the distal end side and the proximal end side of the cylindrical support portion are formed such that the inner peripheral surface is further expanded in diameter. The end portion of the cylindrical support portion is further enlarged in diameter so that when the external protection tube (temperature measuring probe) is inserted into the through hole defined by the cylindrical support portion, the external protection tube Guided and easy to insert.

  The contact surface between the outer protective tube and the flange preferably has an inclined surface portion that extends in a direction intersecting the axial direction of the outer protective tube. If it becomes this structure, it will become said structure. When the contact surface has the inclined surface portion, the load concentration can be further suppressed as compared with the case where the contact surface does not have the inclined surface portion.

  The contact surface is preferably formed by gradually reducing the diameter of the enlarged diameter portion as it proceeds from the proximal end side to the distal end side. If it becomes this structure, it will become a structure applicable to the above. This shape is a shape in which the end portion on the distal end side of the enlarged diameter portion is tapered. According to this tapered shape, this shape also serves as a guide when the external protective tube and the flange are assembled. That is, it can be easily assembled.

  It is preferable that the cylindrical part is formed by expanding the end part of the tip part. The tip of the cylindrical portion is formed with an enlarged diameter (formed substantially in the shape of a drum), so that the tip of the outer protective tube is tubular even if it is displaced along the circumferential direction. The part becomes an obstacle to the displacement of the external protective tube. That is, damage to the displaced outer protective tube is suppressed.

  When the temperature measuring probe of the present invention has an internal protective tube, the fixing of the internal protective tube is not particularly limited. That is, either the position of the inner protective tube relative to the flange may be fixed, or the inner protective tube may be supported in a state where the position relative to the flange can be displaced.

  It is preferable that the position of the inner protective tube with respect to the flange is fixed. By fixing the position of the internal protective tube, the displacement of the internal protective tube is also suppressed, and the deformation (bending) of the temperature measuring probe is further suppressed. Moreover, it is suppressed that an internal protective tube damages an external protective tube.

  The inner protective tube is preferably supported by the flange in a swingable state. By supporting the inner protection tube in a swingable state, the force applied by the swinging of the inner protection tube can be released when the temperature measuring probe is about to deform (bend), thereby protecting the inner protection tube. Damage to the tube is reduced.

  Note that the swinging of the inner protective tube refers to an operation in which the tip of the inner protective tube is displaced in at least one of the axial direction, the radial direction, and the circumferential direction. “Supported by flange” means that the position of the swing center of the internal protective tube can be determined by the position relative to the flange, and is not only directly supported by the flange but also not supported directly. (State via another member) may be used.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In addition, each following form is a specific example for implementing this invention, and this invention is not limited only to each following form.

[First embodiment]
This embodiment is a temperature measuring probe whose structure is shown in FIGS. FIG. 1 is a partial cross-sectional view showing the configuration of the temperature measuring probe of this embodiment. FIG. 2 is a cross-sectional view showing a II-II cross section in FIG. FIG. 3 is a view showing a locking structure between the outer protective tube 4 and the flange 5. In addition, in FIG. 1, it showed so that the downward direction might become a front-end | tip (others are also the same).

  The temperature measuring probe 1 of this embodiment has a platinum rhodium type thermocouple 2 (corresponding to a temperature measuring means) having a temperature measuring portion at the tip, and a tip 3a (tip side) closed to accommodate the thermocouple 2. An inner protective tube 3 made of a cylindrical metal-ceramic composite (cermet), an outer protective tube 4 made of ceramics surrounding the inner protective tube 3, and a flange made of stainless steel that supports the outer protective tube 4 5 is provided.

  The thermocouple 2 is a platinum rhodium type thermocouple, and its temperature measuring part is assembled close to or in contact with the inner surface of the distal end portion 3 a of the internal protective tube 3. The base end portion of the thermocouple 2 is connected to an indicator (not shown) via a probe head (terminal head) 25. As shown in FIG. 2, the thermocouple 2 is inserted into the through holes 22 and 22 of the insulating tube 21 having a pair of through holes 22 and 22 that run parallel to each other, and the temperature measuring part at the tip is an insulating tube. It is assembled in a state protruding from the end face of 21.

The inner protective tube 3 is a cylindrical member whose tip is closed. In this embodiment, the distal end portion 3a is a bottomed cylindrical member having a circular cross section that has a smooth curved shape. The inner protective tube 3 is provided in a state where the thermocouple 2 is close to the inner surface except for the tip when the thermocouple 2 is accommodated therein. The inner protective tube 3 is housed inside the thermocouple 2 in a state of being housed in a state where the thermocouple 2 penetrates the insulating tube 21.
The thermocouple 2 and the inner protective tube 3 are fixed at the base end by means not shown. That is, the transition (or swinging) of the thermocouple 2 and the internal protective tube 3 is restricted.

The outer protective tube 4 is a cylindrical member (that is, a cylindrical member) having a circular cross section with both ends opened. The external protective tube 4 is provided so that a small gap is provided between the inner peripheral surface of the inner protective tube 3 and the outer peripheral surface of the inner protective tube 3 when the inner protective tube 3 is accommodated in the inside (hollow part of the shaft core). Yes. That is, in this embodiment, a gap is formed between the inner peripheral surface of the outer protective tube 4 and the outer peripheral surface of the inner protective tube 3.
The outer protective tube 4 includes a diameter-expanded portion 40 whose outer diameter is increased on the proximal end side. The diameter-expanded portion 40 is formed such that its distal-side surface (that is, the surface 40a) gradually increases in diameter as it proceeds from the distal end 4a side to the proximal end 4b side. Further, the base end side surface (that is, the back surface 40b) is formed so as to spread along a plane perpendicular to the axial direction. That is, the enlarged diameter part 40 has a substantially frustoconical outer shape.

The flange 5 is a substantially disc-shaped main body portion 50 that extends in a direction perpendicular to the axial direction, and a substantially cylindrical standing member that is erected on the surface of the base end side of the main body portion 50 (that is, the back surface 50b). Part 52. The flange 5 is joined (fixed) so that the main body portion 50 and the standing portion 52 are integrated.
Further, the flange 5 has a heat resistant plate 55 on the surface 50 a side of the main body 50. By providing the heat-resistant plate 55, the heat resistance of the flange 5 (and the main body 50) is ensured.

The main body portion 50 of the flange 5 has a cylindrical cylindrical support portion 51 erected in the distal direction from the surface 50a of the substantially disc-shaped main body portion 50 at the end portion on the radially inner side.
The cylindrical support portion 51 of the flange 5 has a substantially cylindrical shape that is provided upright on the front surface of the main body portion 50. The cylindrical support portion 51 has a substantially conical inner peripheral surface that substantially coincides with the inclined surface 40 a of the enlarged diameter portion 40. The fact that it substantially matches the outer shape of the enlarged diameter portion 40 on the inner peripheral surface of the cylindrical support portion 51 means that the enlarged diameter portion 40 is inserted into the cylindrical support portion 51 and expanded on the inner peripheral surface of the cylindrical support portion 51. The shape which the back surface 40a of the diameter part 40 can closely_contact | adhere in the state which has the clearance gap which can accept | permit the relative position shift of the enlarged diameter part 40 is shown.

  As for the cylindrical support part 51, the internal protective tube 3 and the external protective tube 4 are inserted in the substantially cylindrical axial center part. At this time, the position of the inner protective tube 3 is fixed via the standing portion 52. Further, the distal end of the outer protective tube 4 is inserted into the axial center of the cylindrical support portion 51 from the proximal end side toward the distal end side. The inserted external protective tube 4 is locked (or supported in a swingable state) in a state where the outer peripheral surface of the enlarged diameter portion 40 and the inner peripheral surface of the cylindrical support portion 51 are in contact with each other.

  The standing portion 52 of the flange 5 has a substantially cylindrical shape provided by standing on the surface on the proximal end side of the main body portion 50 (that is, the back surface 50b). The standing portion 52 has a plate-like standing base portion 53 that extends along the back surface 50 b of the main body portion 50, and a substantially cylindrical standing tube portion 54 that protrudes from the standing base portion 53 in the proximal direction. In this example, the standing portion 52 is joined (fixed) to the main body portion 50 by joining the standing base portion 53 to the main body portion 50 with screws. The joining of the standing part 52 to the main body part 50 may be another joining method such as welding.

The standing base 53 has a plate shape that extends along the back surface 50b of the main body 50 (that is, extends along a direction perpendicular to the axial direction). The standing base 53 is formed so as to be in close contact with no gap when the standing portion 52 is disposed on the back surface 50 b of the main body 50. The standing base portion 53 extends outward in the radial direction of the substantially cylindrical standing tube portion 54.
The substantially cylindrical upright tube portion 54 has the inner protective tube 3 inserted into the axial center thereof, and joins and fixes the inner protective tube 3. The substantially cylindrical upright tube portion 54 is formed so that the inner peripheral surface thereof has a shape corresponding to the outer peripheral surface of the inner protective tube 3. The axial center portion of the substantially cylindrical upright cylinder portion 54 communicates with the cylindrical support portion 51 of the main body portion 50.

  In this embodiment, the outer protective tube 4 is locked and supported by the flange portion 5 by the enlarged diameter portion 40 being caught by the cylindrical support portion 51. In addition, the heat insulating member 6 is disposed on the proximal end side of the enlarged diameter portion 40 in a state where the outer protective tube 4 is inserted into the cylindrical support portion 51 of the flange 5, and heat insulation is ensured. This heat insulating member 6 is also arranged so as to be able to be displaced following the enlarged diameter portion 40. The heat insulating member 6 may be disposed integrally with the outer protective tube 4 or may be disposed separately.

  The temperature measuring probe 1 according to this embodiment has the external protective tube 4 locked to the flange 5 without using a mounting bracket. That is, since the mounting bracket is not used as in the prior art, the mounting bracket is suppressed from becoming a starting point of damage of the temperature measuring probe 1.

  Further, the temperature measuring probe 1 according to the present embodiment is conventional even when the force based on the flow of the molten metal is applied to the temperature measuring probe 1 (and the external protective tube 4) when measuring the temperature of the molten metal. Since the mounting bracket does not restrict the deformation of the temperature measuring probe 1 (and the external protective tube 4) as described above, the temperature measuring probe 1 itself is prevented from being broken by the deformation.

  Furthermore, in the temperature measuring probe 1 of the present embodiment, the outer protective tube 4 is only locked to the flange 5 so as to be able to swing, and the outer protective tube 4 is allowed to shift relative to the flange 5. It has a structure to do. As a result, even when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (specifically, the external protective tube 4) when measuring the temperature of the molten metal, the external protective tube 4 is swung to the position. Due to the deviation, the force is not concentrated on the external protective tube 4 and the external protective tube 4 is prevented from being damaged.

  Furthermore, in the temperature measuring probe 1 of this embodiment, the external protective tube 4 is formed in a state of being spaced apart from the internal protective tube 3, and even if the external protective tube 4 is displaced, the internal protective tube Since the restriction by 3 does not occur, the external protective tube 4 can be prevented from being damaged.

(Modification of the first embodiment)
In the first embodiment, the enlarged diameter portion 40 of the outer protective tube 4 and the cylindrical support portion 51 of the flange 5 are formed to have a substantially truncated cone shape. The form which supports 40 so that rocking | fluctuation is not limited, The following forms can further be illustrated. The temperature measuring probe 1 of the present modification shown below has the same configuration as that of the first embodiment with respect to the configuration that is not particularly mentioned.

This form is the same structure as 1st embodiment except the front-end | tip part 510 of the cylindrical support part 51 of the flange 5 being slightly expanded in diameter. The configuration in the vicinity of the cylindrical support portion 51 of the present embodiment is shown in FIG. 4 in a partially enlarged cross-sectional view similar to FIG.
As shown in the drawing, the distal end portion 510 of the cylindrical support portion 51 of the flange 5 is formed to have a curved shape (R shape) whose diameter smoothly changes. That is, the distal end portion 510 of the cylindrical support portion 51 has a shape without a corner portion.

  Also in the temperature measuring probe 1 of this embodiment, the external protective tube 4 has a structure that allows a positional shift relative to the flange 5. That is, the same effect as the first embodiment is exhibited.

  Furthermore, in the present embodiment, when the outer protective tube 4 is displaced due to the tip portion 510 of the cylindrical support portion 51 being slightly enlarged in diameter (particularly when the tip is displaced along the circumferential direction). ), The external protective tube 4 is prevented from being damaged by being scraped by the opening of the distal end portion 510 of the cylindrical support portion 51.

[Second Embodiment]
The present embodiment is a temperature measurement probe whose structure is shown in FIG. 5 in a partially enlarged sectional view.
The temperature measuring probe 1 of this embodiment is a temperature measuring probe having the same configuration as that of the first embodiment except that the support structure between the external protective tube 4 and the flange 5 is different.

  The outer protective tube 4 includes a diameter-expanded portion 40 whose outer diameter is increased on the proximal end side. As shown in the drawing, the enlarged-diameter portion 40 is formed to have a cross-sectional square shape protruding outward in the radial direction. Specifically, the front surface 40a and the rear surface 40b of the enlarged diameter portion 40 are formed so as to extend along a plane that is parallel to each other and perpendicular to the axial direction. The radial length of the expanded diameter portion 40 (the protruding length in the radial direction from the outer peripheral surface of the outer protective tube 4 where the expanded diameter portion 40 is not formed) is not limited, and can be supported so as to be swingable. Any length is acceptable.

  The flange 5 includes a main body portion 50 and does not include a standing portion 52. That is, the flange 5 is composed of a substantially disc-shaped main body 50. A cylindrical cylindrical support portion 51 having a constant diameter is provided at the axial center portion of the main body portion 50 of the flange 5. The cylindrical support portion 51 is formed with a through hole into which the external protective tube 4 is inserted in the axial center portion. The inner diameter of the cylindrical support portion 51 is larger than the outer diameter of the portion of the outer protective tube 4 where the enlarged diameter portion 40 is not formed, and smaller than the outer diameter of the enlarged diameter portion 40.

The distal end of the outer protective tube 4 is inserted into the cylindrical support portion 51 of the flange 5. The outer protective tube 4 is supported by the flange 5 in such a manner that the diameter-expanded portion 40 cannot pass through the through hole, and thereby can swing.
Also in the temperature measuring probe 1 of this embodiment, the external protective tube 4 has a structure that allows a positional shift relative to the flange 5. That is, the same effect as the first embodiment is exhibited.

[Third embodiment]
This embodiment is a temperature measuring probe whose structure is shown in FIGS. The temperature measuring probe 1 of the present embodiment is a temperature measuring probe having the same configuration as that of the first embodiment except that the locking structure of the inner protective tube 3 is different. FIG. 6 is a diagram showing a configuration of the temperature measuring probe 1 of the present embodiment. FIG. 7 is a view showing a cross section taken along line VII-VII in FIG. 6, and is a view showing a locking structure of the inner protective tube 3 in a cross section perpendicular to the axial direction. In FIG. 7, the illustration of the thermocouple 2 disposed in the axial center is omitted. FIG. 8 is a diagram schematically showing a structure in which the internal protection tube 3 is supported by the support pins 7, and is a diagram showing a configuration taken along line VIII-VIII in FIG. 7. In the temperature measurement probe 1 of the present embodiment, the components that are not particularly referred to are the same as those in the first embodiment.

The inner protective tube 3 is provided with a groove 30 having a concave cross section over the entire circumference in the vicinity of the end on the base end 3b side. The cross-sectional shape of the groove 30 indicates a shape in a cross section perpendicular to the direction in which the groove 30 extends.
The outer protective tube 4 is a cylindrical member (substantially cylindrical member) having a circular cross section. When the internal protective tube 3 is accommodated (or inserted) inside (or the axial center), the external protective tube 4 has a small space between the inner peripheral surface and the outer peripheral surface of the internal protective tube 3. Is provided. That is, the outer protective tube 4 has a substantially cylindrical shape whose inner diameter is larger than the outer diameter of the inner protective tube 3.

  The flange 5 includes a substantially disc-shaped main body portion 50 that extends in a direction perpendicular to the axial direction, and a substantially cylindrical upright portion 52 that stands on the back surface 50 b of the substantially disc-shaped main body portion 50.

The standing portion 52 includes a plate-like standing base portion 53 that extends along the back surface 50 b of the main body portion 50, and a substantially cylindrical standing tube portion 54 that protrudes from the standing base portion 53 in the proximal direction.
The standing tube portion 54 has the inner protection tube 3 inserted in the axial center portion thereof, and supports the inner protection tube 3 in a swingable state. The substantially cylindrical upright tube portion 54 is formed in a cylindrical shape having an inner peripheral surface with a gap between the inner peripheral surface and the outer peripheral surface of the inner protective tube 3.

  The support of the internal protection tube 3 in the standing portion 52 (standing tube portion 54) is performed by using the tip of the support pin 7 penetrating the cylindrical standing portion 52 (standing tube portion 54) as the groove of the internal protection tube 3. This is done by inserting into 30.

  Specifically, as shown in FIG. 7, the standing portion 52 (standing tube portion 54) has three radially inward in a state where the inner protective tube 3 is inserted through the shaft center portion. The support pin 7 is fixed in a penetrating state. The distal end of the support pin 7 penetrating the standing portion 52 (standing tube portion 54) is inserted into the groove 30 of the inner protective tube 3, and comes into contact with the side wall surface 3d on the proximal end 3b side of the groove 30. There is a gap between the side wall surface 3c on the tip 3a side. That is, the width of the opening of the groove 30 (the distance between the pair of side wall surfaces 3 c and 3 d) is formed wider than the thickness of the support pin 7.

The tip of the support pin 7 inserted into the groove 30 comes into contact with the bottom surface 3 e of the groove 30. In this embodiment, the support pin 7 is made of a bolt, and its tip is pressed against the bottom surface 3e of the groove 30 to apply a biasing force radially inward. In this embodiment, the support pin 7 is inserted into the groove 30 and the support pin 7 and the side wall surface 3d of the groove 30 are not in contact with each other (a state separated by a small interval). 3 is allowed to swing.
In this embodiment, the support pin 7 is formed of a bolt. However, as long as the insertion amount to the groove 30 at the tip can be adjusted in a state of penetrating the standing portion 52 (standing tube portion 54). A member other than a bolt may be used.

The temperature measuring probe 1 of the present embodiment locks (supports) the outer protective tube 4 and the inner protective tube 3 in a swingable manner on the flange 5 without using a mounting bracket. That is, since the mounting bracket is not used as in the prior art, the mounting bracket is suppressed from becoming a starting point of damage of the temperature measuring probe 1.
The temperature measuring probe 1 of this embodiment is locked (supported) in a state where the outer protective tube 4 can swing on the flange 5, and exhibits the same effect as in the first embodiment.

  Further, the temperature measuring probe 1 according to the present embodiment is a conventional temperature measuring probe 1 even when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (and the internal protective tube 3) when the temperature of the molten metal is measured. As described above, since the mounting bracket does not restrict the deformation of the temperature measuring probe 1 (and the internal protective tube 3), the temperature measuring probe 1 itself is prevented from being broken by the deformation.

  In the temperature measuring probe 1 of the present embodiment, the inner protective tube 3 is supported in a state that it can swing with respect to the flange 5. In this configuration, the inner protective tube 3 is allowed to be displaced relative to the flange 5. As a result, even when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (internal protective tube 3) when measuring the temperature of the molten metal, the internal protective tube 3 is swung so that the internal protective tube 3 is swung. Therefore, it is possible to prevent the internal protective tube 3 from being damaged.

  Furthermore, in the temperature measuring probe 1 of this embodiment, each of the external protective tube 4 and the internal protective tube 3 is instructed in a state where it can swing independently. For this reason, even if the force based on the flow of the molten metal is applied to the temperature measuring probe 1 and the outer protective tube 4 is bent (elastically deformed), the inner protective tube 3 does not regulate the bending. Conversely, even if the inner protective tube 3 swings, the outer protective tube 4 does not restrict the swing. That is, damage to the external protective tube 4 due to the internal protective tube 3 is suppressed, and breakage of the temperature measuring probe 1 is suppressed.

(Modification of the third embodiment)
In the second embodiment, the outer protective tube 4 and the inner protective tube 3 are formed in a state where they do not come into contact with each other (each of them is formed so as to be able to swing independently). The inner protective tube 3 may be integrated.

  In this embodiment, as shown in FIG. 9, the outer protective tube 4 is a cylindrical member having a circular cross section with both ends opened, and when the inner protective tube 3 is accommodated inside, the inner surface is the inner protective tube. 3 are integrally provided so as to be in contact with the outer peripheral surface 3 (the entire outer peripheral surface is in contact). FIG. 9 is a partially enlarged sectional view.

  In this embodiment, the outer protective tube 4 and the inner protective tube 3 are integrally formed in a swingable state. That is, similarly to the second embodiment, an effect of suppressing breakage of the temperature measuring probe 1 is exhibited.

  Furthermore, in this embodiment, since the external protective tube 4 and the internal protective tube 3 are integrally formed, the exposed area of the internal protective tube 3 is reduced. That is, the area in which the inner protective tube 3 is in contact with the molten metal is reduced, and wear of the inner protective tube 3 due to contact with the molten metal is suppressed.

1: Temperature measuring probe 2: Thermocouple 3: Internal protection tube 4: External protection tube 5: Flange 6: Thermal insulation member 7: Support pin 8: Mounting bracket

The temperature measuring probe of the present invention is a temperature measuring probe for measuring the temperature of the molten metal by immersing the tip in the molten metal, and a temperature measuring means for measuring the temperature at the tip of the temperature measuring probe, and an outer periphery of the temperature measuring probe. An external protective tube made of ceramics that forms at least a part of the surface and accommodates the temperature measuring means, and a flange that contacts the external protective tube and positions the external protective tube. The flange has an enlarged diameter portion in which at least a part of the outer diameter is enlarged, and the flange has an inner diameter smaller than the outer diameter on the proximal end side of the enlarged diameter portion, and the inside thereof extends from the proximal end side toward the distal end side. It has a cylindrical part that defines a through-hole into which the external protective tube is inserted, and the external protective tube has its tip portion allowed to be displaced in at least one of the axial direction, the radial direction, and the circumferential direction. And is supported by a flange.

It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the latching structure of the external protective tube of the temperature measuring probe of 1st embodiment. It is the figure which showed the latching structure of the external protective tube of the temperature measuring probe of the modification of 1st embodiment. It is the figure which showed the latching structure of the external protection tube of the temperature measuring probe of a reference form example. It is the figure which showed the structure of the temperature measuring probe of the example of 2nd embodiment. It is the figure which showed the latching structure of the internal protective tube of the temperature measuring probe of 2nd embodiment. It is the figure which showed the latching structure of the internal protective tube of the temperature measuring probe of 2nd embodiment. It is the figure which showed the latching structure of the external protection pipe | tube and internal protection pipe | tube of the temperature measuring probe of the modification of 2nd embodiment. It is the figure which showed the structure of the external protective tube of the conventional temperature measuring probe.

In the temperature measuring probe according to the present invention, the outer protective tube has an enlarged diameter part in which at least a part of the outer diameter is enlarged, and the flange has an inner diameter shorter than the outer diameter of the enlarged diameter part, and the inside is based on the inside. There is a through hole into which the external protective tube is inserted from the end side toward the front end side .
Furthermore, in the temperature measuring probe of the present invention, the outer protective tube has an enlarged diameter portion in which at least a part of the outer diameter is enlarged, and the flange has an outer diameter on the proximal end side of the enlarged diameter portion. It has a cylindrical portion that is smaller and defines a through hole into which the external protective tube is inserted from the proximal end side toward the distal end side .

[ Reference form ]
The present embodiment is a temperature measurement probe whose structure is shown in FIG. 5 in a partially enlarged sectional view.
The temperature measuring probe 1 of this embodiment is a temperature measuring probe having the same configuration as that of the first embodiment except that the support structure between the external protective tube 4 and the flange 5 is different.

[ Second Embodiment]
This embodiment is a temperature measuring probe whose structure is shown in FIGS. The temperature measuring probe 1 of the present embodiment is a temperature measuring probe having the same configuration as that of the first embodiment except that the locking structure of the inner protective tube 3 is different. FIG. 6 is a diagram showing a configuration of the temperature measuring probe 1 of the present embodiment. FIG. 7 is a view showing a cross section taken along line VII-VII in FIG. 6, and is a view showing a locking structure of the inner protective tube 3 in a cross section perpendicular to the axial direction. In FIG. 7, the illustration of the thermocouple 2 disposed in the axial center is omitted. FIG. 8 is a diagram schematically showing a structure in which the internal protection tube 3 is supported by the support pins 7, and is a diagram showing a configuration taken along line VIII-VIII in FIG. 7. In the temperature measurement probe 1 of the present embodiment, the components that are not particularly referred to are the same as those in the first embodiment.

(Modified form of the second embodiment)
In the second embodiment, the outer protective tube 4 and the inner protective tube 3 are formed in a state where they do not come into contact with each other (each of them is formed so as to be able to swing independently). The inner protective tube 3 may be integrated.

Claims (6)

A temperature measuring probe that measures the temperature of the molten metal by immersing the tip in the molten metal,
A temperature measuring means for measuring the temperature at the tip of the temperature measuring probe;
Forming at least part of the outer peripheral surface of the temperature measuring probe, and an external protective tube made of ceramics containing the temperature measuring means therein;
A flange that contacts the external protective tube and positions the external protective tube;
Have
The temperature measuring probe, wherein the outer protective tube is supported by the flange in a state in which a distal end portion thereof is allowed to be displaced in at least one of an axial direction, a radial direction, and a circumferential direction. The external protective tube has an enlarged diameter part formed by enlarging at least a part of the outer diameter,
The flange has an inner diameter smaller than an outer diameter on the proximal end side of the enlarged diameter portion, and a cylindrical portion defining a through hole into which the outer protective tube is inserted from the proximal end side toward the distal end side. The temperature measuring probe according to claim 1.   The temperature measuring probe according to claim 2, wherein the diameter of the outer peripheral surface of the enlarged diameter portion and the inner peripheral surface of the cylindrical portion is gradually reduced from the proximal end side toward the distal end side.   The temperature measuring probe according to any one of claims 1 to 3, wherein the temperature measuring means is accommodated in an internal protective tube whose tip is closed.   The temperature measuring probe according to claim 4, wherein the position of the inner protective tube relative to the flange is fixed.   The temperature measuring probe according to claim 4, wherein the inner protective tube is supported by the flange in a swingable state.

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