JP5403172B2 - Temperature measuring instrument - Google Patents

Description

  The present invention relates to a temperature measuring device configured by inserting a sheath thermometer such as a sheathed resistance thermometer or a sheathed thermocouple into a protective tube, and in particular, exhibits excellent responsiveness capable of reducing the time lag of temperature detection. For example, the present invention relates to a temperature measuring device suitably used for measuring the temperature of a polymer reactor.

  Conventionally, this type of temperature measuring instrument has a good thermal conductivity metal filled in the gap between the tip of the protective tube and the sheath thermometer to improve their adhesion, or the tip of the protective tube and the sheath thermometer. The thing which provided the screw | thread in the junction part and improved these adhesiveness is proposed (for example, refer patent document 1, 2). In order to improve responsiveness, it is important to ensure the thermal contact between the sheath and the protective tube as much as possible, in addition to taking the ratio between the outer diameter of the protective tube and the insertion length (aspect ratio) as large as possible. Thermal contact is ensured, contributing to improved responsiveness.

  However, in the case of filling with a good heat conductive metal (proposed in Patent Document 1), the response is improved by improving the heat conduction, but a liquid metal is used as the good heat conductive metal, and the mounting direction is always downward. If it is installed in the upward or lateral direction, the filled metal with good heat conductivity will leak, and if the metal with good heat conductivity changes, its characteristics will change and stable for a long time. There is a problem that temperature measurement becomes difficult. In addition, in the case where a screw is provided at the joint portion between the protective tube and the sheath thermometer (proposed in Patent Document 2), it cannot be easily detached, and if dust or the like bites into the threaded portion, it can be detached. It may not be possible.

  On the other hand, by making the gap between the outer diameter of the detection part of the sheath thermometer and the inner diameter of the protective tube within a specific range, there is no filling such as the above liquid metal and there is no structure such as screwing, There has been proposed a temperature measuring device that can easily attach and detach a sheath thermometer from a protective tube and can maintain excellent responsiveness (see Patent Document 3). However, in the case of providing such a minute gap, there is a certain limit to further improving the response, and manufacturing management and cost are also required. When the protective tube receives vibration from the outside, the thermal contact state is not achieved. There is also a risk that the response will be shifted due to instability.

JP 48-92799 A Japanese Patent Laid-Open No. 54-10882 JP-A-10-176957

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem that the thermal contact between the sheath thermometer and the protective tube is ensured, and excellent responsiveness in temperature detection can be exhibited and the sheath into the protective tube can be exhibited. The object of the present invention is to provide a temperature measuring instrument that can easily remove and install the thermometer and can greatly reduce the manufacturing and management costs.

  In order to solve the above-mentioned problems, the present invention provides a temperature measuring device in which a sheath thermometer is mounted in a protective tube, and a temperature characterized by pressing the sheath thermometer against the inner wall of the protective tube using a pressing member. A measuring instrument was constructed. Here, the pressing member is a linear or plate-like spring material curved outward along the longitudinal direction on the outer peripheral surface of the sheath thermometer, and one or a plurality of the spring members are provided in the longitudinal direction. The curved shape portion of the spring material is preferably brought into contact with and deformed against the inner wall of the protective tube, and the elastic thermosetting force is used to press the portion of the outer surface of the sheath thermometer opposite to the spring material against the inner wall of the protective tube.

  Further, at least one end side of the spring material is a free end that slides in the longitudinal direction with respect to the outer peripheral surface of the sheath thermometer, and a slide that bulges left and right in a substantially T shape or a substantially Y shape at the free end. What provided the moving part is preferable.

  Further, the spring material is formed by connecting two or more curved shape portions in the longitudinal direction, fixing a predetermined position between the curved shape portions to the outer peripheral surface of the sheath thermometer, and both ends on the sheath side. What becomes a free end which slides to a longitudinal direction with respect to a thermometer outer peripheral surface is preferable.

  Alternatively, a preferred embodiment is one in which one end side of the spring material is fixed to the outer surface of the sheath thermometer and the other end is a free end that slides in the longitudinal direction with respect to the outer surface of the sheath thermometer. .

  The pressing member is a linear or plate-like spring material curved outward along the longitudinal direction on the outer peripheral surface of the sheath thermometer, and one end side of the spring material is connected to the sheath thermometer. In addition to being fixed to the outer peripheral surface, the other end is a free end extending to the distal end side from the distal end portion of the sheath thermometer, and the spring material is extended by mounting the sheath thermometer in the protective tube. The end side comes into contact with the bottom wall of the protective tube, and the curved portion of the spring material is deformed into contact with the inner wall side of the protective tube. It is also preferable that the structure be in pressure contact with the wall.

  In the temperature measuring device according to the present invention as described above, direct heat conduction is reliably and easily performed by pressing any portion of the outer surface of the sheath thermometer against the inner wall of the protective tube by the pressing member, and in temperature detection. Excellent responsiveness can be exhibited. In addition, the curved shape part of the spring material is contacted and deformed to the inner wall of the protective tube, and the elastic restoring force is used to press the portion of the outer surface of the sheath thermometer opposite to the spring material to the inner wall of the protective tube. It is possible to perform direct heat conduction reliably and easily with a simple structure and exhibit excellent responsiveness in temperature detection. In addition, it is possible to press the length of the sheath thermometer to the inner wall of the protective tube simply by setting the size and number of the spring material, depending on the application and the type and size of the protective tube and sheath thermometer. A suitable thermal contact state can be obtained easily and at low cost.

  In addition, the detachment operation can be performed by a simple operation of simply inserting / removing a sheath thermometer with a spring material on the outer peripheral surface thereof into / from the protective tube, and the spring material is a linear or plate-like shape extending in the longitudinal direction. Since it is a spring, even if the inner wall of the protective tube is somewhat rough during attachment / detachment, it can be operated smoothly without catching or distorting the spring material, and there is a degree of freedom to follow a bent protective tube. In addition, there is no risk of leakage of the packing material or sticking of the screw portion as in the conventional proposal, and in the inserted state, the spring material maintains a stable posture on the outer peripheral surface of the sheath thermometer, and vibration is generated. The thermal contact state can be stabilized even by the above, and highly accurate measurement with little responsive blurring can be performed.

  In addition, since a slide receiving portion bulging left and right in a substantially T or Y shape is provided at the free end of the spring material, the slide receiving portion moves in the longitudinal direction on the outer peripheral surface of the sheath thermometer. Thus, the spring material can be smoothly deformed, and its elastic restoring force stably acts on the sheath thermometer. In addition, due to the ease of deformation, the insertion operation into the protective tube becomes extremely easy, and a good crimping state to the inner wall of the protective tube is ensured by the action of a stable elastic restoring force.

  In addition, the spring material is formed by connecting two or more curved portions in the longitudinal direction, and a predetermined position between the curved portions is fixed to the outer surface of the sheath thermometer and both ends are free ends. A relatively long range of the thermometer can be stably and uniformly crimped to the inner wall of the protective tube.

  In addition, since one end side of the spring material is fixed to the outer surface of the sheath thermometer and the other end side is a free end, it can be crimped to the inner wall of the protective tube by narrowing to a relatively short range of the sheath thermometer, for example This is particularly effective in the case of a sheathed resistance temperature detector having a temperature sensitive length at the tip.

  Also, one end of the spring material is fixed to the outer surface of the sheath thermometer, and the other end is a free end extending from the distal end of the sheath thermometer, and the sheath thermometer is mounted in the protective tube. Thus, the other end side of the spring material extends into contact with the bottom wall of the protection tube, and the curved shape portion of the spring material contacts and deforms on the inner wall side of the protection tube. By adopting a structure where the part opposite to the spring material is pressed against the inner wall of the protective tube, direct heat conduction can be performed reliably and easily with the same simple structure, and excellent responsiveness in temperature detection can be demonstrated. In addition, since the other end side of the spring material comes into contact with the bottom wall of the protective tube and the curved portion comes into contact with the inner wall of the protective tube, the dimension is set to have a gap between the spring material and the inner wall of the protective tube. It is also possible to install the sheath thermometer more smoothly. It is possible to perform in the figure. Further, by appropriately setting the mounting position of the sheath thermometer and the extending length of the spring material, the sheath thermometer can be more reliably and firmly pressed against the inner wall of the protective tube.

(A) is explanatory drawing which shows the whole structure of the temperature measuring device which concerns on 1st Embodiment of this invention, (b) is AA cross-sectional view of a temperature measuring device similarly. (A) is a side view which shows the sheath thermometer which provided the spring material similarly inserted in the protection tube of a temperature measuring device, (b) is also a perspective view. The perspective view which shows the modification which provided only one curved shape part in the spring material. The perspective view which shows the modification which comprised the spring material with the board | plate material. The cross-sectional view which shows the modification which formed the sliding receiving part in the substantially Y shape. (A), (b) is a side view which shows the modification of a spring material. (A), (b) is a side view which shows another modification of a spring material. (A)-(c) is a longitudinal cross-sectional view which shows the principal part of the temperature measuring device which concerns on 2nd Embodiment of this invention. (A)-(d) is explanatory drawing explaining the structure of each comparative example used for the response speed test.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1A is a diagram showing an overall configuration of a temperature measuring device according to the present invention. FIGS. 1 to 7 show a first embodiment, FIG. 8 shows a second embodiment, and reference numeral 1 in the drawing denotes temperature measurement. 2 is a sheath thermometer, 3 is a protective tube, and 4 is a spring material.

  As shown in FIGS. 1A and 1B, the temperature measuring device 1 according to the first embodiment is configured by mounting a sheath thermometer 2 in a protective tube 3, and in particular, a sheath thermometer. The spring material 4 including the curved shape portions 5 and 5 having a shape curved outward along the longitudinal direction is provided at a predetermined radial angle portion 20a on the outer peripheral surface 20 of the second circumferential surface 20, and the curved shape portion of the spring material 4 is provided. 5 and 5 are brought into contact with and deformed against the inner wall 30a of the protective tube, and a portion 20b of the outer surface 20 of the sheath thermometer opposite to the spring material 4 is pressed against the inner wall 30b of the protective tube by its elastic restoring force.

  The sheath thermometer 2 can be applied with various sheathed thermocouples and sheathed resistance thermometers according to various conventionally known applications, and the protective tube 3 together with the sheathed thermocouples and sheathed resistance thermometers, etc. The well-known thing used conventionally can be used. In addition, as an application, it has been mentioned that it is suitable for a polymerization reactor in the above description of the technical field, but the present invention is not limited to such an application. For example, it has high corrosion resistance and can be processed. However, when applied to a glass lining thermometer having a problem in response, a thermometer having high response can be obtained. Further, the spring material 4 may be set to an appropriate size (thickness, shape) that can exert the pressure contact function by the elastic restoring force according to the dimensions of the sheath thermometer 2 and the protective tube 3. .

  The spring material 4 is composed of a bent wire, and as shown in FIG. 2, two curved portions 5 and 5 are connected in the longitudinal direction, and the sheath temperature between the curved portions 5 and 5 is A predetermined position (substantially central position) 40 that contacts the total outer peripheral surface 20 is fixed to a predetermined angle portion 20 a on the outer peripheral surface 20 of the sheath thermometer 2. The both ends of the spring material 4 are free ends 41 and 41 that slide in the longitudinal direction with respect to the outer peripheral surface 20 (predetermined angle portion 20a). Therefore, when the sheath thermometer 2 having the spring material 4 provided in the protective tube 3 is inserted, the curved portions 5 and 5 of the spring material 4 are pushed by the inner wall of the protective tube so as to be crushed while accumulating elastic restoring force. However, each free end 41 moves outward to allow the deformation smoothly.

  The spring material 4 is specifically formed by bending a metal wire such as stainless steel. Here, if the metal wire is a metal material having particularly excellent heat conduction, a curved shape that contacts the protective tube inner wall 30a in addition to the portion 20b opposite to the outer surface 20b of the sheath thermometer that is directly pressed against the protective tube inner wall 30b. This is preferable in that heat can be transferred to the sheath thermometer 2 through the portions 5 and 5. However, the material of the spring material 4 is not particularly limited as long as an elastic restoring force is generated by deformation, and may be composed of a material other than a metal material. Further, in addition to the spring material 4 configured in a linear shape, for example, as illustrated in FIG. 4, it may be configured by a plate material.

  The spring material 4 is provided along the longitudinal direction on a predetermined angle portion 20a of the outer peripheral surface 20 of the sheath thermometer 2, and the curved shape portion 5 of the spring material 4 abuts against the protective tube inner wall 30a, Due to the reaction force of the elastic restoring force of the spring material 4, the portion 20 b on the opposite side of the outer peripheral surface 20 of the sheath thermometer 2 is pressed against the inner wall 30 b of the protective tube. The method of attaching the spring material 4 onto the outer peripheral surface 20 (predetermined angle portion 20a) is fixed by welding or the like in this example. In addition to this, for example, a locking projection on the outer peripheral surface 20 of the sheath thermometer It is also a preferred embodiment to attach the spring material 4 so as to be immovably engaged in the longitudinal direction by locking the engaging hole provided in the spring material 4 to the protrusion. Similarly, as a method of attaching to the engaged state, it is also preferable to provide protrusions to be latched at the rising portions inside the curved shape portions 5 and 5 and engage so as to be sandwiched from both.

  The free ends 41, 41 on both ends of the spring material 4 are provided with slide receiving portions 6 that bulge to the left and right in a substantially T shape, respectively, and this slide receiving portion 6 is the outer periphery of the sheath thermometer 2. The curved portion 5 can be smoothly deformed by moving in the longitudinal direction on the predetermined angle portion 20a of the surface 20, and the elastic restoring force stably acts on the sheath thermometer 2. Due to this ease of deformation, the insertion operation into the protective tube becomes extremely easy, and the action of the stable elastic restoring force ensures good pressure bonding to the protective tube inner wall 30b, and reliably exhibits excellent responsiveness of temperature measurement. Is.

  In this example, the sliding receiving portion 6 is formed by reciprocatingly deforming both ends of the wire constituting the spring material 4 so as to be folded left and right. As long as the shape has a receiving function that does not slide in the circumferential direction from the top of 20a, it can be formed into a mouth shape or other shapes, for example. Further, as shown in FIG. 5, it is a preferred embodiment that the sliding receiving portion 6 is formed in a substantially Y shape. In the T-shaped sliding receiving portion 6, when the sheath thermometer 2 is inserted into the protective tube 3 and slid on the outer surface 20 of the sheath thermometer, it may be laterally displaced and contact the inner wall of the protective tube. When there is a gap in the wall or when the inner wall is rough, the sliding receiving portion 6 may be caught by the inner wall of the protective tube due to such contact, but if it is configured in a substantially Y shape as shown in FIG. The lateral displacement can be prevented to prevent breakage, and the sheath thermometer 2 can be inserted into the protective tube 3 smoothly and suitably. In particular, in FIG. 5, it is configured in a curved substantially Y shape so as to wrap around the outer peripheral surface 20, thereby enabling a smoother sliding movement on the outer peripheral surface 20.

  Of course, the slide receiving portion 6 may be separately configured and attached to both ends of the wire by welding or the like. Further, when the spring material 4 is formed of a plate material as described above, it may have a substantially T-shaped bulge shape as shown in FIG. 4, but such a bulge may be formed depending on the width of the plate material. It is also possible to cause the end face having the same width as the curved shape portion 5 to function as the slide receiving portion 6 without configuring the protruding shape. Further, even when the spring material 4 is formed of a plate material in this way, the slide receiving portion 6 is configured in a substantially Y shape to prevent lateral displacement, or the outer peripheral surface of the sheath thermocouple 2 is provided at least at the contact portion. It is preferable to provide a concave portion to receive a part.

  Although two curved portions 5 of the spring material 4 are provided in this example, three or more curved portions 5 may be provided continuously. In this case, as in this example, it is preferable to fix or engage with the predetermined angle portion 20a of the outer surface 20 of the sheath thermometer at a predetermined position between any of the curved portions. Further, as shown in FIG. 3, one or a plurality of curved portions 5 are provided, and the end opposite to the free end 41 is used as a fixed end to be fixed or engaged with the outer surface of the sheath thermometer. Also good. As shown in FIG. 3, the elastic restoring force generated in the case where only one curved shape portion 5 is provided is in a part of the range of the sheath thermometer 2, but the temperature measuring point is partly in the tip, such as in the case of a sheath thermocouple. In a limited case, it is also effective to configure such that only one curved shape portion 5 is positioned so that the temperature measuring point is pressed against the inner wall of the protective tube. When the number of the curved portions 5 is small, the resistance at the time of attachment to and removal from the protective tube is reduced and workability is improved.

  The attachment of the spring material 4 to the outer peripheral surface 20 of the sheath thermometer 2 is not limited to the method of supporting it by fixing or engaging as described above. For example, the entire spring material 4 is freely moved in the longitudinal direction by a predetermined distance. It is also possible to restrain and attach as possible. For example, a pair of protrusions for stopping the spring material 4 at a predetermined distance in the longitudinal direction may be provided on the outer peripheral surface 20 of the sheath thermometer 2 and the spring material 4 may be attached so as to be able to move between these protrusions. . In addition, when the spring material 4 is made of a plate material as shown in FIG. 4, a long hole is provided in the spring material 4, and a protrusion that engages with the long hole is provided on the outer peripheral surface 20 to thereby determine the length of the long hole. It may be configured such that only the spring material 4 can move.

  As described above, in the present embodiment, the example in which only one spring material 4 is provided on the outer peripheral surface 20 of the sheath thermometer 2 has been described, but depending on the length, application, and type of the sheath thermometer 2 and the protective tube 3, It is also a preferable example that a plurality of spring materials are continuously arranged in the longitudinal direction so that an arbitrary longer range of the sheath thermometer 2 is crimped to the inner wall of the protective tube.

  In the above example, as the spring material 4, one end of the curved portion 5 is fixed to the outer peripheral surface predetermined angle portion 20a of the sheath thermometer 2, and the free end 41 on the other end side is fixed to the outer peripheral surface 20 (predetermined angle portion 20a). However, as another example, for example, as shown in FIG. 6, a predetermined position 40 on one end side is fixed to the outer peripheral surface predetermined angle portion 20a of the sheath thermometer 2 as well. In addition, a curved portion 5 is formed that folds back from the fixed portion into a substantially V shape or C shape and extends obliquely upward, and the end portion is a free end 41 that freely moves in the vertical direction. Is also preferable. In the figure, (a) shows an example in which a plurality of such spring materials 4 are provided, and (b) in the figure shows an example in which one relatively long spring material 4 is provided, both from the distal end side to the proximal end side. A folded curved portion 5 is provided, but the central portion is fixed, and a pair of curved shapes each consisting of a folded portion from the distal end side to the proximal end side and a folded portion from the proximal end side to the distal end side at both ends. Of course, it is possible to provide a part.

  As still another example, as shown in FIG. 7, for example, the spring material 4 can be formed in an annular shape or a substantially C shape in which both ends are fixed. In the figure, (a) illustrates an annular configuration, and (b) illustrates an approximately C-shaped configuration, and in both cases, the curved portion 5 has a substantially pentagonal shape with a central position bent in a mountain shape. However, as long as the shape is in contact with the inner wall 30a of the protective tube and is easily deformed, other shapes, for example, the bent portion R is reduced to a shape close to a rhombus, or conversely gently curved. An oval shape is also preferable. In the examples shown in FIGS. 6 and 7, the spring material 4 can of course be constituted by a plate material such as a flat plate in addition to the wire material such as a round bar.

  Moreover, although the case where a spring material is used as the pressing member has been described in the above embodiment, the present invention is not limited thereto, and for example, a sponge-like resin piece, a rubber piece, or the like may be used as the pressing member. Even when these pressing members are used, it is preferable that an arbitrary part of the sheath thermometer and the protective tube are arranged so as to be in direct contact so that the pressing member is not interposed in the contact portion.

  Next, a second embodiment of the present invention will be described based on FIG.

  In the present embodiment, as shown in FIG. 8A, a predetermined position 40 on one end side of the curved portion 5 of the spring material 4 is fixed to a predetermined angle portion 20 a on the outer peripheral surface 20 of the sheath thermometer 2. At the same time, the other end is a free end 41 extending from the distal end portion 21 of the sheath thermometer 2 to the distal end side. When the sheath thermometer 2 provided with the spring material 4 is inserted into the protective tube 3, the free end 41 on the other end side where the spring material 4 extends is the protective tube 3 as shown in FIG. 8b, the spring material 4 is pushed from the free end 41 in the direction of contraction, and the curved portion 5 of the spring material 4 moves toward the protective tube inner wall 30a as shown in FIG. 8C. Furthermore, the portion 20b on the opposite side of the outer peripheral surface 20 of the sheath thermometer 2 is 180 ° away from the inside of the protective tube by the reaction force of the elastic restoring force of the deformed spring material 4 by bending so as to protrude further. It will be pressed against the wall 30b.

  According to such a configuration, the free end 41 on the other end side of the spring material 4 is in contact with the protective tube bottom wall 30c, and the curved portion 5 is bent to be in contact with the protective tube inner wall 30a. It is possible to set a dimension having a gap between the spring material 2 before deformation and the inner wall 30a of the protective tube, and it is possible to perform the mounting operation of the sheath thermometer 2 more smoothly. The spring material 4 may be a wire material or a plate material, and the material and other modified examples are the same as those in the first embodiment, and the description thereof will be omitted. In this example, only one curved portion 5 is provided between the fixed position 40 and the free end 41. However, the present invention is not limited to this, and two or more curved portions may be provided continuously.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

  Next, the results of testing the response speed of Example 1 according to the present invention and Comparative Examples 1 to 4 having other structures will be described. In all cases, the sheath thermometer was a sheath resistance thermometer.

  Example 1 has the structure shown in FIG. 1, and Comparative Example 1 has a straight sheath thermometer 102 inserted into a straight protective tube 103 through a gap as shown in FIG. 5A. It is a conventional normal structure. Comparative Example 2 has a structure in which the tip of the sheath thermometer 102 is bent in a ring shape as shown in FIG. 5B, and the ring portion at the tip is pressed against the inner wall 103a (bottom wall) at the tip of the protective tube. It is. In Comparative Example 3, as shown in FIG. 5C, the diameter-reduced portion 103b at the tip of the protective tube 103 is made of tantalum having excellent heat conduction, and the diameter-reduced portion 103b of the sheath thermometer 102 is interposed through a minute gap. The front end side is built in and corresponds to the above-mentioned Patent Document 3. In Comparative Example 4, as shown in FIG. 5 (d), a thin plate-like fin 107 is attached to the outer peripheral surface of the sheath thermometer 102 so as to be along the inner wall of the protective tube 103, and the protective tube is interposed via the fin 107. It is a structure which conducts heat to a sheath thermometer.

  In the test, each temperature measuring device of Example 1 and Comparative Examples 1 to 4 was instantaneously inserted into a 92 ° C. hot water circulation tank, and the temperature rise of the resistance temperature detector was measured in time (seconds). The results are shown in Table 1 below.

  As can be seen from Table 1, in Example 1 of the present invention, 63.20% is reached in about 30 seconds and 90% is reached in about 1 minute. On the other hand, in Comparative Example 1, it took nearly 4 minutes to increase to 63.20% and took more than 8 minutes to increase to 90%, which is a considerable delay. This is because the temperature measuring part of the sheath resistance thermometer does not directly contact the inner wall of the protective tube, and due to the presence of the air layer, heat transfer from the side surface takes time and the response speed is poor.

  Although the comparative example 4 was contacted via the fin, it can be predicted that the effect of improving the response speed was slight because of indirect heat transfer. Comparative Example 2 is in direct contact and has improved responsiveness compared to Comparative Examples 1 and 4, but it is not sufficient since 90 minutes and 2 minutes have passed. This is because the sheath resistance thermometer is in contact only with the bottom surface of the protective tube, and it can be predicted that heat transfer time to the temperature measuring portion is required. Although the comparative example 3 was the most responsive among the other comparative examples, it still takes nearly 2 minutes to 90%.

  From the above results, it can be seen that the present invention in which the outer peripheral surface of the sheath, which is a temperature measuring portion, is directly pressed against the inner wall of the protective tube is extremely excellent in responsiveness. The tip portion of Comparative Example 3 is made of a material (tantalum) different from that of the other portions and assembled by screwing or the like. Such an assembled portion causes contamination (contamination) of the object to be processed. However, in the present invention, there is no such tip portion or its assembly portion, and a sheath thermometer is easily installed with a spring material inside a normal straight protective tube. Therefore, there is no risk of contamination or corrosion of the object to be processed.

DESCRIPTION OF SYMBOLS 1 Temperature measuring device 2 Sheath thermometer 3 Protective tube 4 Spring material 5 Curved part 6 Sliding receiving part 20 Outer peripheral surface 21 Tip 20a Outer peripheral surface 20b Outer peripheral surface 30a Inner wall 30b Inner wall 30c Bottom wall 40 Position 41 Free end 102 Sheath temperature Total 103 Protective tube 103a Inner wall 103b Reduced diameter portion 107 Fin

Claims (2)

In a temperature measuring device with a sheath thermometer mounted in a protective tube,
On the outer peripheral surface of the sheath thermometer, one or a plurality of pressing members, which are linear or plate-like spring materials curved outward along the longitudinal direction, are provided in the longitudinal direction,
The spring material fixes one end side or the central part to the outer peripheral surface of the sheath thermometer, folds the other end side from the fixed one end side part, or folds both end sides from the fixed central part, respectively. A curved shape portion extending obliquely upward, and a free end that freely moves the tip of the curved shape portion in the vertical direction,
A temperature characterized by deforming the curved shape portion of the spring material into contact with the inner wall of the protective tube and pressing the portion of the outer surface of the sheath thermometer opposite to the spring material with the elastic restoring force against the inner wall of the protective tube. Measuring instrument. In a temperature measuring device with a sheath thermometer mounted in a protective tube,
On the outer peripheral surface of the sheath thermometer, one or a plurality of pressing members, which are linear or plate-like spring materials curved outward along the longitudinal direction, are provided in the longitudinal direction,
The spring material is annular and a part thereof is fixed on the outer peripheral surface of the sheath thermometer, or is substantially C-shaped and both ends are fixed on the outer peripheral surface of the sheath thermometer. A portion excluding a part or both ends is configured as a curved shape portion that curves and projects outward,
A temperature characterized by deforming the curved shape portion of the spring material into contact with the inner wall of the protective tube and pressing the portion of the outer surface of the sheath thermometer opposite to the spring material with the elastic restoring force against the inner wall of the protective tube. Measuring instrument.

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