TW201351734A - Temperature detecting device and temperature detecting system using the same - Google Patents

Abstract

A temperature detecting device and a temperature detecting system using the same are provided. The temperature detecting device includes a hollow member, a coated layer, a plurality of thermal couple wires and a temperature detecting module. The hollow member has a plurality of temperature detecting points, a closed end and an open end. The temperature detecting points are distributed on an inner surface of the hollow member from the closed end to the open end. The coated layer is coated to cover an outer surface of the hollow member. The thermal couple wires pass through the open end of the hollow member and are electrically connected to the temperature detecting points respectively to detect respective temperatures of the temperature detecting points and transmit potential difference signals. The temperature detecting module is electrically connected to the thermal couple wires to receive the potential difference signals so as to compute the temperatures of the temperature detecting points.

Description

Temperature measuring device and temperature measuring system using the same

The present invention relates to a temperature measuring device, and more particularly to a thermocouple temperature measuring device.

Steel materials are an indispensable resource in today's life, but rust can destroy the structure of steel materials and reduce the service life of steel materials. Since metal zinc is not easily oxidized in dry air, and a dense zinc carbonate film is formed in moist air, the inner steel substrate can be protected from corrosion. Therefore, plating a layer of metallic zinc on the surface of steel materials helps to protect the steel material and extend its life.

Hot dip galvanizing technology has the advantages of good anti-corrosion effect and good economic benefit, and is the most widely used anti-corrosion technology. The principle of hot dip galvanizing is to clean the cleaned steel material, after being treated with a plating solution, immersing it in a zinc bath, and reacting the steel with the zinc solution to form an alloyed film layer.

In the hot dip galvanizing process, the control of the zinc bath temperature in the zinc bath has a great influence on the quality of the hot dip galvanized product. Because the steel coil moves dynamically in the zinc bath, and the immersion roller that drives the coil rotates in the zinc bath, the temperature of the zinc liquid in the zinc bath is non-uniformly distributed to form a temperature field. In addition, when a zinc ingot is added, the temperature of the zinc bath will also change. Therefore, accurately grasping the change of the temperature field of the zinc bath can control the surface quality of the hot dip galvanized product.

Due to the high temperature of the metal solution, the conventional thermocouple temperature measuring device cannot be used to measure the temperature of the molten metal bath. Therefore, the conventional metal liquid bath temperature measurement The device protects the thermocouple device with a solid metal having a higher melting point to measure the temperature of the molten metal bath. However, in a high temperature environment, solid metal is easily eroded and melted due to diffusion, and loses its protective effect.

Another conventional metal liquid bath temperature measuring device covers a thermocouple device by a ceramic material that can withstand high temperatures. However, the thermal conductivity of the ceramic material is not good, and a large error is easily generated.

In addition, the conventional metal liquid bath temperature measuring device can only be used to measure the temperature of a single point, and can not simultaneously measure the temperature of different depths of the metal liquid tank, thereby increasing the inconvenience of the measuring process.

In view of the above, it is not necessary to provide a temperature measuring device for improving the defects of the conventional temperature measuring device, thereby providing a long-term use and simultaneously measuring the temperature of different depths in the molten metal tank to know the metal solution. The temperature field changes.

Therefore, an aspect of the present invention provides a temperature measuring device which is electrically connected to a temperature measuring point of a different position of a hollow member by a thermocouple wire to simultaneously measure the temperature of the temperature measuring point and transmit the potential difference signal. . Then, the temperature measurement module receives the potential difference signal transmitted by the thermocouple line to calculate the change of the temperature field.

Another aspect of the present invention provides a temperature measuring system for simultaneously measuring temperatures of different depths of a molten metal bath by the above-described temperature measuring device.

According to the above aspect of the invention, a temperature measuring device is proposed. In one embodiment, the temperature measuring device comprises a hollow member, a coating, a plurality of thermocouple wires, and a temperature measuring module. The hollow member has a plurality of temperature measuring points and opposite closed ends And an open end, wherein the temperature measuring points are distributed from the closed end to the open end on the inner side wall of the hollow member, and the hollow member is made of the first metal material. The coating is applied to the outer sidewall of the hollow member, and the coating is formed of a ceramic material and a second metallic material. The thermocouple wire is electrically connected to the temperature measuring point through the open end of the hollow member, and is used for measuring the temperature of each temperature measuring point, and transmitting the potential difference signal according to the temperature. The temperature measuring module is electrically connected to each thermocouple wire for receiving the potential difference signal to calculate the temperature of the temperature measuring point.

According to an embodiment of the invention, the hollow member is a cylinder.

According to another embodiment of the invention, the aforementioned outer side wall has a rough surface.

According to still another embodiment of the present invention, the foregoing first metal material may include, but is not limited to, copper, iron, nickel, aluminum, cobalt, tin, chromium, niobium, and any combination thereof.

According to still another embodiment of the present invention, the coating is uniformly applied to the outer side wall by a spray method.

According to still another embodiment of the present invention, the aforementioned spraying method is a high-speed flame spraying method.

According to still another embodiment of the present invention, the foregoing second metal material may include, but is not limited to, iron, nickel, cobalt, chromium, aluminum, rhenium, and any combination thereof.

According to still another embodiment of the present invention, the foregoing ceramic material may include, but is not limited to, aluminum oxide, zirconium oxide, tungsten carbide, chromium carbide, tungsten boride, chromium boride, and any combination thereof.

According to still another embodiment of the present invention, the thickness of the aforementioned coating layer is about 80 μm or more and 150 μm or less.

According to the above aspect of the invention, a temperature measuring system is proposed. In a real In the embodiment, the temperature measuring system comprises the aforementioned temperature measuring device and the metal liquid tank. The metal liquid tank contains a liquid metal material, and the materials of the first metal material and the second metal material are different from the liquid metal material. The temperature measuring device is erected in the molten metal tank, and the closed end faces the bottom of the molten metal tank for simultaneously measuring the temperature of different depths of the molten metal tank.

According to an embodiment of the invention, the liquid metal material is liquid zinc.

According to another embodiment of the invention, the length of the temperature measuring device is greater than the depth of the molten metal bath.

The temperature measuring device of the present invention protects the hollow member of the temperature measuring device by utilizing the heat resistance property of the ceramic material of the coating to prevent the high temperature metal liquid from eroding the hollow member and damaging the temperature measuring device.

Furthermore, the present invention measures the temperature of the molten metal bath by the good thermal conductivity of the coating and the hollow member, and can accurately measure the temperature of the molten metal bath, thereby controlling the temperature field change of the molten metal bath.

In addition, the present invention utilizes the temperature measuring point of the hollow member to simultaneously measure the temperature of the different depths of the molten metal tank, and can monitor the change of the full temperature field, thereby maintaining the temperature condition of the molten metal tank and improving the stability of the process.

The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

Please refer to FIG. 1 , which is a schematic structural diagram of a temperature measurement system 100 according to an embodiment of the present invention. The temperature measurement system 100 includes a temperature measurement device 200 With the metal liquid tank 300. The temperature measuring device 200 includes a hollow member 210, a coating 220, a plurality of thermocouple wires 230 and a temperature measuring module 240. The hollow member 210 has a plurality of temperature measuring points 216a, 216b, 216c and 216d, opposite closed ends 210a and open ends 210b, inner side walls 212 and outer side walls 214, wherein the outer side walls 214 have a rough surface, and the temperature measuring points 216a, 216b, 216c and 216d are distributed from the closed end 210a to the open end 210b on the inner side wall 212. The hollow member 210 can be a cylinder, a polygonal cylinder, or other suitable shape, and the hollow member 210 is made of a first metal material. The first metallic material can include, but is not limited to, copper, iron, nickel, aluminum, cobalt, tin, chromium, niobium, other suitable metallic materials, and any combination of the foregoing.

The coating 220 described above is applied to the outer sidewall 214. The coating 220 can be uniformly applied to the outer sidewall 214 by means of a spray. In one embodiment, the foregoing spraying method may be a high velocity oxy-fuel spray (HVOF spray), a plasma spray method, or other suitable spraying method. The coating 220 is formed of a ceramic material and a second metal material. The ceramic material may include, but is not limited to, alumina, zirconia, tungsten carbide, chromium carbide, tungsten boride, chromium boride, other suitable ceramic materials, and any combination thereof, and the second metal material may include, but is not limited to, iron. , nickel, cobalt, chromium, aluminum, niobium, other suitable metallic materials and any combination of the above. In one embodiment, the thickness of the coating 220 is greater than or equal to 80 μm and less than or equal to 150 μm. If the thickness of the coating 220 is less than 80 μm, the coating 220 is insufficiently protected against the hollow member 210, thereby reducing the service life of the temperature measuring device 200. If the thickness of the coating 220 is greater than 150 μm, the coating 220 will cause an error in the measurement result of the temperature measuring device 200, and the manufacturing cost of the temperature measuring device 200 will be greatly increased.

The thermocouple wires 230 are electrically connected to the temperature measuring points 216a, 216b, 216c and 216d respectively through the open end 210b of the hollow member 200 for measuring the temperatures of the temperature measuring points 216a, 216b, 216c and 216d, and The potential difference signal is transmitted according to the measured temperature. The temperature measuring module 240 is electrically connected to each of the thermocouple wires 230 for receiving the potential difference signal to estimate the temperature of the temperature measuring points 216a, 216b, 216c and 216d.

The aforementioned metal liquid tank 300 has a bottom portion 302 and contains a liquid metal material 310.

In the temperature measurement system 100, the temperature measuring device 200 is erected in the molten metal tank 300, and the open end 210b is higher than the liquid surface of the liquid metal material 310, and the closed end 210a of the hollow member 210 faces the molten metal tank 300. Bottom 302. Therefore, the temperature measuring points 216a, 216b, 216c and 216d of the temperature measuring device 200 can respectively correspond to different depths of the molten metal tank 300. The temperature of the liquid metal material 310 of different depths is then conducted to the temperature measuring points 216a, 216b, 216c and 216d by the thermal conductivity of the coating 220 and the hollow member 210, respectively. In this way, the thermocouple wires 230 electrically connected to the temperature measuring points 216a, 216b, 216c and 216d can transmit the potential difference signals according to the measured different depths of the temperature, and the temperature measuring module 240 according to the received potential difference signals. The temperature of the temperature measurement point is derived, and the temperature field change of the metal liquid tank 300 can be known.

The aforementioned temperature measuring device 200 ensures that the hollow member 210 can withstand the high temperature of the liquid metal material 310 by the ceramic material of the coating 220, and reduces the influence of the diffusion of the liquid metal material 310, and utilizes the second metal of the coating 220. The material is used to enhance the thermal conductivity of the coating 220 to reduce the effect of the ceramic material on the measurement results. Therefore, the hollow member 210 of the temperature measuring device 200 can be immersed in the molten metal tank 300 for a long time by the protection of the coating 220. By monitoring the temperature field change of the liquid metal material 310, the conditions of the metal bath 300 can be stabilized, and the quality of the immersion metal process can be controlled.

Further, the temperature of different regions of the molten metal tank 300 can be measured by moving the position of the temperature measuring device 200, so that the temperature field change of the entire region of the molten metal tank 300 is known.

In an embodiment, the aforementioned liquid metal material 310 may be liquid zinc. The temperature measuring device 200 can be immersed in liquid zinc for a long time to monitor the temperature field change of the liquid zinc, and can control the surface quality of the hot dip galvanized product.

In one embodiment, the length of the temperature measuring device 200 may be greater than the depth of the molten metal tank 300 to thereby measure the temperature near the bottom 302 of the molten metal tank 300.

It can be seen from the above embodiments of the present invention that the temperature measuring device of the present invention protects the hollow member of the temperature measuring device from the diffusion of the high temperature molten metal by the protection of the coating, and utilizes the good thermal conductivity of the coating and the hollow member. To measure the temperature of the metal bath, the temperature of the metal bath can be measured for a long time and accurately, and the temperature field change of the metal bath can be controlled.

In addition, the temperature measuring device of the present invention uses the temperature measuring point of the hollow member to simultaneously measure the temperature of the different depths of the molten metal tank, and can monitor the change of the full temperature field, thereby maintaining the temperature condition of the molten metal tank, and improving the process. Stability.

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100‧‧‧ system

200‧‧‧ device

210‧‧‧ components

210a‧‧‧closed end

210b‧‧‧Open end

212‧‧‧ inner side wall

214‧‧‧Outer side wall

216a‧‧‧ Temperature measurement point

216b‧‧‧ Temperature measurement point

216c‧‧‧ Temperature measurement point

216d‧‧‧ Temperature measurement point

220‧‧‧ coating

230‧‧‧ thermocouple line

240‧‧‧ modules

300‧‧‧metal tank

302‧‧‧ bottom

310‧‧‧Metal materials

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

100‧‧‧ system

200‧‧‧ device

210‧‧‧ components

210a‧‧‧closed end

210b‧‧‧Open end

212‧‧‧ inner side wall

214‧‧‧Outer side wall

216a‧‧‧ Temperature measurement point

216b‧‧‧ Temperature measurement point

216c‧‧‧ Temperature measurement point

216d‧‧‧ Temperature measurement point

220‧‧‧ coating

230‧‧‧ thermocouple line

240‧‧‧ modules

300‧‧‧metal tank

302‧‧‧ bottom

310‧‧‧Metal materials

Claims (12)

A temperature measuring device comprising: a hollow member having a plurality of temperature measuring points and a relatively closed end and an open end, wherein the temperature measuring points are distributed from the closed end to the open end to one of the hollow members The inner side wall, and the hollow member is made of a first metal material; a coating is applied to one of the outer side walls of the hollow member, wherein the coating is made of a ceramic material and a second metal material Formed; a plurality of thermocouple wires passing through the open end of the hollow member and electrically connected to the temperature measuring points, respectively, for measuring the temperature of one of each of the temperature measuring points, and transmitting according to the temperature a potential difference signal; and a temperature measurement module electrically connected to each of the thermocouple wires for receiving the potential difference signal to calculate the temperature of the temperature measurement point. The temperature measuring device of claim 1, wherein the hollow member is a cylinder. The temperature measuring device of claim 1, wherein the outer side wall has a rough surface. The temperature measuring device of claim 1, wherein the first metal material is selected from the group consisting of copper, iron, nickel, aluminum, cobalt, tin, chromium, niobium, and any combination thereof. The temperature measuring device of claim 1, wherein the coating is uniformly applied to the outer sidewall by a spray method. The temperature measuring device according to claim 5, wherein the spraying method is a high-speed flame spraying method. The temperature measuring device according to claim 1, wherein the second metal material is selected from the group consisting of iron, nickel, cobalt, chromium, aluminum, cerium, and any combination thereof. The temperature measuring device according to claim 1, wherein the ceramic material is selected from the group consisting of alumina, zirconia, tungsten carbide, chromium carbide, tungsten boride, chromium boride, and any combination thereof. The temperature measuring device according to claim 1, wherein the thickness of the coating layer is substantially greater than or equal to 80 μm and less than or equal to 150 μm. A temperature measuring system, comprising: a temperature measuring device according to any one of claims 1 to 9; and a metal liquid tank containing a liquid metal material, wherein the first metal material and The material of the second metal material is different from the liquid metal material, and the temperature measuring device is erected in the molten metal tank, and the closed end is oriented The bottom of one of the metal baths is used to simultaneously measure the temperature of the metal bath at different depths. The temperature measurement system of claim 10, wherein the liquid metal material is liquid zinc. The temperature measurement system of claim 10, wherein one of the temperature measuring devices has a length greater than the depth of the molten metal bath.