JP4979479B2 - Surface thermometer - Google Patents

Description

  The present invention relates to a surface thermometer for detecting the temperature of the surface of an object to be measured such as a bearing of a pump driven by an electric motor or the like.

  Conventionally, in an oil plant or the like, for example, as shown in FIG. 3, a pump 201 driven by an electric motor 200 or the like is a bearing, that is, the surface temperature of the outer casing 100 and the outer casing surface temperature are ambient temperatures. It is managed how much it has risen. For example, the surface temperature of the bearing outer casing 100 of the pump 201 is 65 ° C. or lower, or whether the temperature rise from the ambient temperature is within 40 ° C.

At this time, conventionally, the surface temperature of the outer casing 100 of the bearing, which is the object to be measured, is measured by sticking a “temperature indicating material” 1A, which changes color at a predetermined temperature, which is called a thermo label, to the surface of the pump bearing casing. ing. As the temperature indicating material 1A, those having various configurations have been proposed (for example, see Patent Documents 1 and 2).
Japanese Unexamined Patent Publication No. 7-27633 JP 2001-303034 A

  However, commercially available temperature indicating materials, so-called thermo labels, have a small display part, which may be difficult to see in an oil plant or the like, and when a machine such as an attached pump is installed outdoors. However, since the temperature indicating material is made of a resin film or the like, there is a problem in weather resistance in terms of the material, discoloration in a short period, and visual recognition (visual confirmation) may be impossible.

  Accordingly, an object of the present invention is to provide a surface thermometer that has good weather resistance and can be used repeatedly.

  Another object of the present invention is to provide a surface thermometer having good sensitivity, good visibility, and being hardly affected by outside air temperature.

The above object is achieved by the surface thermometer according to the present invention. In summary, the present invention is a surface thermometer that is installed on the surface of an object to be measured and detects the surface temperature of the object to be measured,
At least a part is a heat-sensitive part that contacts the surface of the object to be measured, a temperature-sensitive container member that can contain a temperature-sensitive material therein, and at least a part that is detachably attached to the temperature-sensitive container member Has a cap member made of a transparent substance,
The temperature-sensitive container member includes a cap support portion having a female screw portion inside a cylindrical body, and a heat-sensitive portion integrally disposed on the cap support portion that closes one end opening of the cap support portion. Have
The cap member is a cylindrical member, and a male screw part is formed at one end thereof, and the temperature-sensitive container member is formed by screwing the male screw part of the cap member with the female screw part of the cap support part. Removably attached to the
A space is formed inside the temperature sensitive container member by attaching the cap member to the temperature sensitive container member,
A display member having a predetermined display portion is installed in the space portion, a temperature sensitive material is accommodated in the space portion between the display member and the cap member,
The temperature sensitive material is opaque in a solid state, and the display part of the display member cannot be visually confirmed through the cap member,
The temperature-sensitive material is melted and changed into a liquid by being heated to a predetermined temperature from the object to be measured through the heat-sensitive portion, and the display portion of the display member can be visually confirmed through the cap member. Thus, the thermosensitive material is a surface thermometer characterized in that it becomes opaque by returning to a solid state, and the visual observation through the cap member of the display portion of the display member becomes impossible.

In the present invention , according to an embodiment, the heat sensitive part is a metal material having a thickness of 1 to 5 mm, and the cap member is made of an acrylic resin.

  In the present invention, according to one embodiment, the temperature-sensitive material has a melting point at a predetermined temperature under normal pressure, and is composed of a hot-melt material that changes from a granular or powdery solid to a liquid. .

  In one embodiment, the hot-melt material is at least one selected from paraffin, fatty acid, fatty acid ester, alcohol, amine, amide and derivatives thereof.

  The surface thermometer of the present invention has good weather resistance and can be used repeatedly. In addition, it has good sensitivity, good visibility, and is hardly affected by outside air temperature.

  Hereinafter, the surface thermometer according to the present invention will be described in more detail with reference to the drawings.

Example 1
1 (a) and 1 (b) show an embodiment of a surface thermometer 1 according to the present invention. Next, the structure of the surface thermometer 1 of a present Example is demonstrated.

(Configuration of surface thermometer)
In this embodiment, the surface thermometer 1 includes a temperature-sensitive container member 2 and a cap member 3 that is detachably attached to the temperature-sensitive container member 2. At least a part of the temperature-sensitive container member 2 is a heat-sensitive portion 4 that contacts the surface of the object to be measured 100, and is a container-shaped member that can accommodate the temperature-sensitive material 10 therein.

  The cap member 3 is attached to the temperature-sensitive container member 2 to form a closed space portion 5 inside the temperature-sensitive container member 2. As described above, the temperature sensitive material 10 can be accommodated in the space 5, and the display member 20 is also accommodated. As will be described later, the cap member 3 is entirely made of a transparent material in this embodiment. However, the cap member 3 is not limited to this, and at least a part 3a is made of a transparent material. The display member 20 installed inside the temperature-sensitive container member 2 can be structured to be visually recognized (confirmed visually) through the transparent portion 3a.

  More specifically, the temperature-sensitive container member 2 is integrated with the cap support 6 in the present embodiment in such a manner that the cap support 6 having an internal thread 6a therein and the one end opening of the cap support 6 are closed. And a heat-sensitive portion 4 arranged.

  The heat-sensitive part 4 is preferably made of a metal material having good heat conduction, such as a steel plate having a thickness (t2) of 1 to 5 mm. In the present example, the cap support portion 6 and the heat-sensitive portion 4 were integrally made of steel. Although not limited to this, in this embodiment, the cap support 6 has a cylindrical body (circular tube) having an outer diameter (d1) of 34 mm and a wall thickness (t1) of 5 mm, and has an internal thread 6a inside. Formed. The plate thickness (t2) of the heat sensitive plate formed integrally with the cylindrical body 6 and functioning as the heat sensitive portion 4 was 2 mm.

  In this embodiment, the cap member 3 is a columnar member, and a male screw portion 7 is formed on the outer peripheral portion of one end thereof. Therefore, the cap member 3 is detachably attached to the temperature-sensitive container member 2 by screwing the male screw portion 7 of the cap member 3 with the female screw portion 6a of the temperature-sensitive container member 2.

  According to the present embodiment, as described above, the temperature sensitive material 10 and the display member are provided between the temperature sensitive container member 2 and the cap member 3 with the cap member 3 attached to the temperature sensitive container member 2. A closed space 5 for accommodating 20 is formed. According to the present embodiment, the display member 20 is disposed in close contact with the space portion side of the heat sensitive plate 4 with, for example, a heat resistant adhesive (for example, epoxy adhesive). The cap member 3 and the heat sensitive plate 4 are separated by a distance (t3) = about 4 mm, and the volume of the space portion 5 is about 1.8 ml.

  In this embodiment, the cap member 3 is required to have chemical resistance, strength, and workability. Furthermore, as described above, transparency is required for at least a part of the cap member 3.

  As a material satisfying all the above properties, an acrylic resin is preferable. Therefore, in this example, the cap member 3 was manufactured as a single piece by machining an acrylic rod material. Of course, an acrylic resin may be molded.

  A sealing tape is wound around the screw portion 7 of the cap member 3 and screwed into the screw portion 6a of the temperature-sensitive container member 2 so that the cap member 3 and the temperature-sensitive container member 2 are fixed together in a liquid-tight manner. can do. Moreover, it has sufficient pressure resistance against an increase in pressure in the space portion 5 and can maintain airtightness.

  In order to maintain the transparency of the cap member 3, it is preferable to coat and coat the outer surface of the cap member 3 with, for example, urethane resin.

  The display member 20 fixed to the heat-sensitive plate 4 of the temperature-sensitive container member 2 should be visible through the cap member 3 when a heat-meltable material as the temperature-sensitive material 10 described later changes to a transparent liquid state. Anything can be used. Examples of the display unit 20a formed on the display member 20 include a character that displays a character such as a set temperature as “70 ° C.” on paper, a seal, or the like, and a color that displays the entire display screen in red or yellow. .

  The surface of the display member 20 that comes into contact with the temperature sensitive material 10 accommodated in the space 5 is preferably coated (coated) with, for example, urethane resin.

  In the present invention, the temperature sensitive material 10 is composed of a hot-melt material. In the present invention, the heat-meltable substance is a substance that has a melting point at a predetermined temperature under normal pressure (1 atm) and changes from a granular or powdery solid to a liquid. Is not transparent but white turbid (opaque) and has a characteristic of being transparent in a liquid state.

  There are various kinds of hot-melt materials having the above-mentioned properties, and for example, at least one selected from paraffin, fatty acid, fatty acid ester, alcohol, amine, amide and derivatives thereof is used.

  More specifically, as an example, the following hot-melt materials can be appropriately selected according to the desired temperature display of the surface thermometer 1 and used alone or in combination.

(paraffin)
n- hexadecane (C ₁₆ H ₃₄₎ mp 18.2 ° C.
n- octadecane (C ₁₈ H ₃₈₎ mp 28.2 ° C.
n-Nonadecane (C ₁₉ H ₄₀ ) Melting point 32.1 ° C.
n-eicosane (C ₂₀ H ₄₂ ) Melting point 36.4 ° C.
n-Heneicosane (C ₂₁ H ₄₄ ) Melting point 40.5 ° C
n-docosane (C ₂₂ H ₄₆ ) Melting point 44.0 ° C.
n- tetracosane (C ₂₄ H ₅₀₎ mp 50.6 ° C.
n-Hexacosane (C ₂₆ H ₅₄ ) Melting point 56.3 ° C.
n-Heptacosane (C ₂₇ H ₅₆ ) Melting point 59.5 ° C.
n-Octacosane (C ₂₈ H ₅₈ ) Melting point 61.4 ° C
n-Triacontane (C ₃₀ H ₆₂ ) Melting point 65.4 ° C.
n-Tetracontane (C ₄₀ H ₈₂ ) Melting point 81.0 ° C
(fatty acid)
Caprylic acid (C ₇ H ₁₅ COOH) Melting point 16.7 ° C
Pelargonic acid (C ₈ H ₁₇ COOH) Melting point 12.5 ° C
Capric acid (C ₉ H ₁₉ COOH) Melting point 31.6 ° C
Undecanoic acid (C ₁₀ H ₂₁ COOH) Melting point 29.3 ° C
Lauric acid (C ₁₁ H ₂₃ COOH) Melting point 44.2 ° C
Myristic acid (C ₁₃ H ₂₇ COOH) Melting point 53.9 ° C
Palmitic acid (C ₁₅ H ₃₁ COOH) Melting point 63.1 ° C
Stearic acid (C ₁₇ H ₃₅ COOH) Melting point 69.6 ° C
Oleic acid (C ₁₇ H ₃₅ COOH) Melting point 13.4 ° C
Elaidic acid (C ₁₇ H ₃₃ COOH) Melting point 46.5 ° C
Arachidic acid (C ₁₉ H ₃₉ COOH) Melting point: 75.3 ° C
Behenic acid (C ₂₁ H ₄₃ COOH) Melting point 79.9 ° C
(Fatty acid ester)
Methyl myristate (C ₁₃ H ₂₇ COOCH ₃ ) Melting point 18.8 ° C.
Methyl palmitate (C ₁₅ H ₃₁ COOCH ₃ ) Melting point 30.6 ° C
Methyl stearate (C ₁₇ H ₃₅ COOCH ₃ ) Melting point 39.1 ° C.
Methyl arachidate (C ₁₉ H ₃₉ COOCH ₃ ) Melting point 46.6 ° C.
Methyl behenate (C ₂₁ H ₄₃ COOCH ₃ ) Melting point 53.3 ° C.
Ethyl myristate (C ₁₃ H ₂₇ COOC ₂ H ₅ ) Melting point 12.3 ° C.
Ethyl palmitate (C ₁₅ H ₃₁ COOC ₂ H ₅ ) Melting point 24.4 ° C.
Ethyl stearate (C ₁₇ H ₃₅ COOC ₂ H ₅ ) Melting point 33.9 ° C.
Ethyl arachidate (C ₁₉ H ₃₉ COOC ₂ H ₅ ) Melting point 41.7 ° C.
Ethyl behenate (C ₂₁ H ₄₃ COOC ₂ H ₅ ) Melting point 48.7 ° C.
(alcohol)
1-dodecanol (C ₁₂ H ₂₅ OH) Melting point 24.0 ° C.
1-tridecanol (C ₁₃ H ₂₇ OH) Melting point 30.6 ° C
1-tetradecanol (C ₁₄ H ₂₉ OH) Melting point 37.9 ° C.
1-Hexadecanol (C ₁₆ H ₃₃ OH) Melting point 49.3 ° C.
1-octadecanol (C ₁₈ H ₃₇ OH) Melting point 58.0 ° C.
1-Icosanol (C ₂₀ H ₄₁ OH) Melting point 65.5 ° C.
1-docosanol (C ₂₂ H ₄₅ OH) Melting point: 70.5 ° C
1-tetracosanol (C ₂₄ H ₄₉ OH) Melting point: 75.5 ° C.
1-Hexacosanol (C ₂₆ H ₅₃ OH) Melting point: 79.3 ° C.
1-octacosanol (C ₂₈ H ₅₇ OH) Melting point: 82.5 ° C
1-Triacontanol (C ₃₀ H ₆₁ OH) Melting point 86.5 ° C.
(Amine)
Tetradecylamine (C ₁₄ H ₂₉ NH ₂ ) Melting point 37.0 ° C.
Hexadecylamine (C ₁₆ H ₃₃ NH ₂ ) Melting point 46.0 ° C
Octadecylamine (C ₁₈ H ₃₇ NH ₂ ) Melting point 51.8 ° C
Ikoshiruamin (C ₂₀ H ₄₁ NH ₂₎ mp 57.0 ° C.
Docosylamine (C ₂₂ H ₄₅ NH ₂ ) Melting point 63.0 ° C
(Amide)
Hexanamide (C ₅ H ₁₁ CONH ₂ ) Melting point 101 ° C.
Heptanamide (C ₆ H ₁₃ CONH ₂ ) Melting point 96 ° C.
Octanamide (C ₇ H ₁₅ CONH ₂ ) Melting point 105 ° C
Nonamide (C ₈ H ₁₇ CONH ₂ ) Melting point 99 ° C.
Decanamide (C ₉ H ₁₉ CONH ₂ ) Melting point 99 ° C.

(Assembly and operation of surface thermometer)
Next, the assembly and operation mode of the surface thermometer 1 of the present embodiment having the above-described configuration will be further described.

  When using the surface thermometer 1 of the present embodiment configured as described above, first, for example, a heat-resistant adhesive (for example, on the surface of the heat sensitive plate 4 in the space 5 of the temperature sensitive container member 2). The display member 20 is placed in close contact with an epoxy adhesive). At this time, the character portion 20a of the display member 20 is positioned not on the heat sensitive plate 4 side but on the space portion 5 side.

  Subsequently, the space part 5 of the temperature-sensitive container member 2 is filled with a granular or powdery hot-melt material as the temperature-sensitive material 10. In the present embodiment, the temperature sensitive material 10 was filled so as to form a layer of about 4 mm in the space 5. The cap member 3 is screwed into the threaded portion 6a of the tube temperature container member 2. At this time, it is desirable that a sealing tape (not shown) is wound around the screw portion 7 of the cap member 3 and screwed into the screw portion 6a of the temperature-sensitive container member 2.

  In the surface thermometer 1 assembled in this manner, the granular or powdery hot-melt material 10 is still filled therein, so that the display member 20 installed inside from the transparent cap member 3 side is kept as it is. The character portion 20a cannot be visually recognized (confirmed visually).

  The surface thermometer 1 in this state is used as a heating element, that is, as shown in FIG. 3, for example, on the surface of an object 100 to be measured such as a pump outer casing, instead of the conventional “temperature indicating material” 1A. Install so that the plate 4 contacts. When the surface temperature of the pump outer casing 100 rises to a predetermined temperature (in this embodiment, for example, 70 ° C.) or higher, the temperature sensitive material (eg, stearic acid) 10 is heated to the melting point temperature via the heat sensitive plate 4. The granular or powdery hot-melt material melts and changes to a liquid state.

  Therefore, the character portion of the display member 20 disposed inside the surface thermometer 1 can be clearly seen from the transparent cap member 3 side.

  Here, when the temperature of the heating body 100 decreases, the temperature-sensitive material 10 in a liquid state is cooled and changes to a solid state. Thereby, the temperature sensitive material 10 becomes a cloudy state (opaque), and the character portion 20a of the display member 20 disposed inside the surface thermometer 1 cannot be visually recognized. That is, the temperature sensitive material 10 used in the present invention is a so-called reversible temperature sensitive material that changes from a white turbid (opaque) state to a transparent state and from a transparent state to an opaque state.

  Next, when the temperature of the heating body 100 rises, the solid temperature-sensitive material 10 changes to a liquid state again, and the character portion 20a of the display member 20 disposed inside the surface thermometer 1 as in the above embodiment. However, it becomes clearly visible from the transparent cap member 3 side.

  The granular or powdery hot-melt substance is liquefied and solidified by the first heating immediately after the inside of the surface thermometer 1 is filled with the granular or powdery hot-melt substance as the temperature sensitive material 10. As a result, the volume decreases. Therefore, it is preferable to remove the gap member 3 and refill the space portion 5 with the reduced amount.

In this example, the surface thermometer 1 of 20 ° C., 30 ° C., 40 ° C., and 70 ° C. was prepared.
(1) For the surface thermometer at 20 ° C., n-hexadecane (reagent: manufactured by Wako Pure Chemical Industries, Ltd.)
(2) n-octadecane (reagent: manufactured by Wako Pure Chemical Industries, Ltd.) for the 30 ° C surface thermometer
(3) Methyl stearate (reagent: Wako Pure Chemical Industries, Ltd.) is used for the 40 ° C surface thermometer.
(4) Stearic acid (reagent: manufactured by Wako Pure Chemical Industries, Ltd.)
I was able to get good results.

  The surface thermometer 1 of this example can be used repeatedly, and as a result of the tests by the present inventors, it was possible to use it even for several tens of times. In particular, there was no problem even when the surface thermometer of (4) was subjected to 50 repeated tests. Moreover, the performance was verified by installing it outdoors for a long time, but there was no deterioration in performance despite the long-term outdoor use.

  The surface thermometer 1 of the present invention having the above configuration has good weather resistance and can be used repeatedly. Further, the surface thermometer of the present invention has characteristics that it has good sensitivity, good visibility, and is hardly affected by outside air temperature.

Fig.1 (a) is a perspective view which shows one Example of the surface thermometer which concerns on this invention, FIG.1 (b) is sectional drawing. FIG. 2A is a top view showing a state before temperature detection of the surface thermometer according to the present invention, and FIG. 2B is a top view showing a state at the time of temperature detection. FIG. It is a schematic perspective view which shows the pump bearing vicinity in which a surface thermometer is installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface thermometer 2 Temperature sensitive container member 3 Cap member 4 Thermal plate (heat sensitive part)
5 Space 6 Cap support (cylindrical body)
10 Hot-melt material (temperature-sensitive material)
20 display member 20a display unit 100 bearing outer casing (measurement object)

Claims (4)

A surface thermometer installed on the surface of the object to be measured and detecting the surface temperature of the object to be measured,
At least a part is a heat-sensitive part that contacts the surface of the object to be measured, a temperature-sensitive container member that can contain a temperature-sensitive material therein, and at least a part that is detachably attached to the temperature-sensitive container member Has a cap member made of a transparent substance,
The temperature-sensitive container member includes a cap support portion having a female screw portion inside a cylindrical body, and a heat-sensitive portion integrally disposed on the cap support portion that closes one end opening of the cap support portion. Have
The cap member is a cylindrical member, and a male screw part is formed at one end thereof, and the temperature-sensitive container member is formed by screwing the male screw part of the cap member with the female screw part of the cap support part. Removably attached to the
A space is formed inside the temperature sensitive container member by attaching the cap member to the temperature sensitive container member,
A display member having a predetermined display portion is installed in the space portion, a temperature sensitive material is accommodated in the space portion between the display member and the cap member,
The temperature sensitive material is opaque in a solid state, and the display part of the display member cannot be visually confirmed through the cap member,
The temperature-sensitive material is melted and changed into a liquid by being heated to a predetermined temperature from the object to be measured through the heat-sensitive portion, and the display portion of the display member can be visually confirmed through the cap member. The surface thermometer is characterized in that the thermosensitive material becomes opaque by returning to a solid state, and visual observation through the cap member of the display portion of the display member becomes impossible. The surface thermometer according to claim 1 , wherein the heat sensitive part is a metal material having a thickness of 1 to 5 mm, and the cap member is made of an acrylic resin. 3. The thermosensitive material according to claim 1 or 2 , wherein the temperature-sensitive material has a melting point at a predetermined temperature under normal pressure and is composed of a hot-melt material that changes from a granular or powdery solid to a liquid. The surface thermometer described. The surface thermometer according to claim 3 , wherein the hot-melt material is at least one selected from paraffin, fatty acid, fatty acid ester, alcohol, amine, amide, and derivatives thereof.

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