KR101902334B1 - Thermocouple assembly - Google Patents

Abstract

The present invention relates to thermocouple assembly. In the thermocouple assembly measuring the temperature inside a chamber housing, the thermocouple assembly according to an embodiment of the present invention comprises: a sealing unit disposed in a place of a portion of the chamber housing, and including first and second through holes; a first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole; a hollow thermocouple support tube inserted into the second through hole and having the second thermocouple disposed therein, one end located inside the chamber housing and the other end positioned outside the chamber housing; and a fixing unit disposed in contact with the other end of the thermocouple support tube to seal the chamber housing to prevent air from leaking from the housing through the thermocouple support tube.

Description

Thermocouple assembly {THERMOCOUPLE ASSEMBLY}

The present invention relates to a thermocouple assembly. More particularly, the present invention relates to a thermocouple assembly capable of precisely measuring and controlling the temperature of a high temperature flowing gas without error.

A thermocouple is a sensor made by joining two kinds of metals to measure a wide range of temperature by using a seeback effect. The sensor is widely used in extreme environments such as a power plant or a steel mill because of its durability.

Here, the Jebeck effect is a phenomenon in which, when two different kinds of metals are combined, a thermoelectric power is generated between two metals when the temperatures at both ends are different from each other. By using this, The temperature difference between the two contacts can be known.

In a conventional gas temperature measurement method, a temperature of a gas flowing through a pipe is measured by inserting a thermocouple into a temperature measurement port provided in a gas pipe. At this time, the temperature measurement stage of the thermocouple can increase the temperature due to the convection convection from the gas, and can measure the temperature of the gas from the output signal of the thermocouple proportional to the elevated temperature.

However, thermal radiation occurs due to the difference in temperature between the surface of the thermocouple and the inner surface of the transfer pipe from the surface of the thermocouple to the surface of the inner surface of the gas pipe. In particular, when the gas flowing in the pipe is a gas at a high temperature, The generated radiant heat loss becomes much larger than the convection heat received from the gas, and the temperature of the thermocouple becomes lower than the actual gas temperature. This phenomenon is problematic in that it is difficult to measure an accurate gas temperature because the radiant heat loss further increases as the gas temperature increases, thereby further increasing the error.

A suction pyrometer is a technique for compensating for the disadvantages of existing thermocouples when measuring the gas temperature. The suction thermometer is a technique to measure the temperature of the gas more closely by rapidly increasing the heat transfer coefficient of the gas by sucking the gas to be measured at a very high speed instantaneously.

However, aspiration thermometer is very useful when only the temperature measurement is required for the purpose of measuring temperature only, as it does not require pressure maintenance as in the case of measuring the internal temperature during fire suppression, but it is difficult to apply it to the case of measuring the temperature in the system, .

Korean Patent Registration No. 10-1163027

In order to solve the problem that the temperature of the target position is not accurately measured due to the bending of the thermocouple due to the high temperature and high velocity gas flow, the thermocouple is protected so as to minimize the shaking of the end of the thermocouple, And a thermocouple support tube including the thermocouple support tube.

A thermocouple assembly according to an embodiment of the present invention is a thermocouple assembly for measuring a temperature inside a chamber housing, the thermocouple assembly comprising: a sealing part disposed in place of a part of the chamber housing and including first and second through-holes; A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole; A thermocouple support tube surrounding at least a part of a second thermocouple surrounding the second thermocouple and inserted into the second through hole, the thermocouple support tube being open at both ends; And a fixing unit disposed at an outer end of the thermocouple support tube exposed to the outside of the chamber housing and fixing the thermocouple support tube and the second thermocouple.

The portion of the second thermocouple not covered by the thermocouple support tube may be 10 to 30 times the diameter of the second thermocouple.

The second thermocouple may have a smaller diameter than the first thermocouple.

In addition, the diameter of the first thermocouple may be 6.35 mm (1/4 ") to 1.56 mm (1/16").

Also, the diameter of the second thermocouple may be 3.18 mm (1/8 ") to 0.5 mm.

The thermocouple support tube may be made of at least one of a metal including at least one of SUS316, SUS304, A617, A800HT, A800H, or Inconel-600, or a ceramic or ceramic composite including at least one of alumina and SiC.

The outer diameter of the thermocouple support tube may be the same as the diameter of the first thermocouple, and the inner diameter may be larger than the diameter of the second thermocouple.

The temperature measurement range of the thermocouple may be -100 ° C to 1200 ° C.

Further, the fixing portion may be disposed outside the chamber housing.

According to another aspect of the present invention, there is provided a thermocouple assembly for measuring a temperature inside a chamber housing, the thermocouple assembly for replacing a portion of the chamber housing and including a first and a second through- part; A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole; A thermocouple support tube surrounding at least a part of a second thermocouple surrounding the second thermocouple and inserted into the second through hole, the thermocouple support tube being open at both ends; And a fixing unit disposed at an outer end of the thermocouple support tube exposed to the outside of the chamber housing and fixing the thermocouple support tube and the second thermocouple.

The thermocouple assemblies according to the embodiments of the present invention can be utilized in nuclear power plants, thermal power plants, chemical plants, and high temperature engineering fields requiring precise measurement of high temperature gas temperature, and can improve industrial productivity through accurate temperature measurement and control.

1 is a view showing a thermocouple assembly according to an embodiment of the present invention installed in a chamber housing;
2 is a cross-sectional view illustrating a thermocouple assembly according to an embodiment of the present invention installed in a chamber housing.
3 shows the chamber housing outer wall, the sealing portion, and the first and second through holes.
Fig. 4 shows the fixture fastened to the thermocouple support tube and the second thermocouple.
5 shows a cross-sectional view of the fixing part.
FIG. 6 illustrates a thermocouple assembly including a sealing portion, a first and a second thermocouple, a thermocouple support tube, and a fixing portion according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Therefore, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements. The same reference numerals are used throughout the drawings to denote like parts and functions. In addition, "including" an element throughout the specification does not exclude other elements unless specifically stated to the contrary.

thermocouple  aggregate

1 is a schematic view schematically showing a thermocouple assembly according to an embodiment of the present invention disposed in a high-temperature furnace.

2 is a cross-sectional view illustrating a thermocouple assembly according to an embodiment of the present invention installed in a chamber housing.

1 and 2, a thermocouple assembly 1000 according to an embodiment of the present invention includes a thermocouple assembly for measuring a temperature inside a chamber housing 100, the thermocouple assembly 1000 being disposed in place of a portion of the chamber housing, A sealing portion 1100 including a first through-hole 1110 and a second through-hole 1120; A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole; A thermocouple support tube (1400) surrounding the second thermocouple and inserted into the second through-hole, the thermocouple support tube (1400) surrounding at least a part of the second thermocouple disposed inside the chamber housing and having both ends open; And a fixing unit 1500 disposed at an outer end of the thermocouple support tube exposed to the outside of the chamber housing and fixing and securing the thermocouple support tube and the second thermocouple to the support tube .

3 schematically shows a chamber housing outer wall, a sealing portion 1100, a first through hole 1110, and a second through hole 1120. As shown in FIG.

3, the sealing portion 1100 may be disposed on one side of the chamber and may be disposed on the upper or lower portion of the chamber, and the position of the sealing portion may not be particularly limited, The position in the housing is not particularly limited. The sealing portion may include a first through hole (1110) and a second through hole (1120). The number of the through holes is adjustable as needed, and may further include third and fourth through holes.

The first thermocouple 1200 and the second thermocouple 1300 are inserted into the first through hole 1110 and the second through hole 1120 of the sealing portion and the ends of the first thermocouple and the second thermocouple are inserted into the chamber It is possible to measure the temperature at a desired position by being positioned at a designed position inside the housing. The end of the first thermocouple and the end of the second thermocouple may be connected to a temperature measuring system to measure the temperature.

The sealing portion can be adjusted so that the atmosphere inside the chamber housing and the outside atmosphere are shut off and sealed through the adjustment of the external device after the first thermocouple and the second thermocouple and the thermocouple support tube are inserted into the first through hole and the second through hole .

At this time, the second thermocouple may be smaller in diameter than the first thermocouple.

If the diameters of the pair of the second thermocouples and the first thermocouples are the same, the error due to the thermal radiation generated in one pair of the thermocouples is the same, so that the temperature measurement error can not be corrected and accurate temperature measurement may be difficult. Therefore, it is preferable that at least one thermocouple among the pair of the second thermocouple and the first thermocouple has a diameter smaller than that of the other thermocouple.

The lower the diameter of the thermocouple, the lower the thermal radiation loss, so the more accurate the temperature can be measured. However, a thin diameter thermocouple may break and warp when exposed to high temperature and high speed fluid, and may cause trembling or deflection in the chamber. A temperature measurement apparatus using a thermocouple may cause a temperature measurement error due to thermal radiation due to a temperature difference between the thermocouple and the surrounding gas and the inner wall of the chamber housing. If one thermocouple is used, the temperature measurement error described above can not be corrected, and accurate temperature measurement and control problems may occur. When the temperature is measured using two thermocouples of different diameters, it is possible to estimate the temperature when there is no radiant heat loss by estimating the heat loss occurring in the first thermocouple and the second thermocouple.

[Equation 1]

(h: convection heat transfer coefficient,?: radiation rate,?: stepless Boltzmann constant, Tg: gas temperature, Tt: thermocouple temperature, Ts:

Here, since two thermocouples of different diameters are arranged, the following equations (2) and (3) can be obtained by applying the above equation to each thermocouple (each thermocouple is represented by the subscripts 1 and 2 division).

&Quot; (2) "

&Quot; (3) "

In the above equations (2) and (3), the reduced radiation error (RRE) is defined by the ratio of the radiant thermocouple radiant error to the temperature difference between the two thermocouples,

&Quot; (4) "

From Equation (4), the actual gas temperature can be expressed by the following Equation (5).

&Quot; (5) "

Through the above calculation process, the measured temperature difference between thermocouples with two different diameters can make it possible to correct the radiation error without estimating the effective radiation ambient temperature of the thermocouple.

The diameter of the first thermocouple may be 1/16 "to 1/4", preferably 1/8 ".

If the length of the first thermocouple is less than 10 times of the diameter, the influence of heat conduction to the outside of the chamber becomes large and the accuracy of the measurement may deteriorate. As the length decreases, the measurement error may increase. If the diameter of the first thermocouple is less than 1.56 mm, the thermocouple may easily bend into the high-temperature and high-speed fluid and the life may be shortened.

The diameter of the second thermocouple may be 1/8 "(0.5 mm) to 3.18 mm (1/16"), preferably 1.56 mm (1/16 ").

The diameter of the second thermocouple must be smaller than the diameter of the first thermocouple to remove the distortion due to the thermal radiation generated in the thermocouple, and the accuracy of the temperature measurement may decrease as the diameter becomes similar. If the diameter of the second thermocouple is less than 0.5 mm, the thermocouple can easily bend into the high-temperature and high-speed fluid, and the life may be shortened.

In the thermocouple assembly according to the embodiment of the present invention, the thermocouple support tube is inserted into the second through hole, and the second thermocouple is disposed therein. One end of the thermocouple support tube is located inside the chamber housing and the other end is disposed outside the chamber housing .

The thermocouple support tube may have the form of a cylindrical tube surrounding at least a part of the second thermocouple, but may be formed in various forms to protect the second thermocouple. The thermocouple support tube protects at least a portion of the second thermocouple so that the second thermocouple can be positioned at a designed position without deflection or bending due to the flow of high temperature, high velocity gas, .

For example, if the diameter of the second thermocouple is 1/16 "(1.59 mm), the outer diameter of the thermocouple support tube is preferably 1/8" (3.16 mm), and the thickness of the thermocouple support tube is 0.028 " .

The thermocouple support tube may include at least one of a metal including at least one of SUS316, SUS304, A617, A800HT, A800H, or Inconel-600, or a ceramic or ceramic composite including at least one of alumina or SiC.

In a thermocouple assembly according to an embodiment of the present invention, the thermocouple support tube may be disposed in a manner to surround at least a portion of the second thermocouple, wherein the thermocouple support tube has rigidity such that it is free from bending or breakage It is preferable that the material is high. Therefore, it may include at least one of a metal including at least one of the thermocouples SUS316, SUS304, A617, A800HT, A800H, or Inconel-600, or a ceramic or ceramic composite including at least one of alumina and SiC. The thermocouple support tube may partially prevent severe exposure from high temperature and high velocity gases and increase the use time of the second thermocouple so that the productivity of the second thermocouple can be improved by reducing the frequency of replacement due to breakage or aging.

The portion of the second thermocouple not covered by the thermocouple support tube may be 10 to 30 times the diameter of the second thermocouple.

If the portion not covered by the thermocouple support tube is less than 10 times the diameter of the thermocouple, the thermocouple tip, that is, the portion where the temperature measuring end is exposed, . If the portion of the second thermocouple not covered by the thermocouple support tube exceeds 30 times the diameter, the second thermocouple can be easily bent by the high temperature and high velocity gas, The accuracy of the measurement may be degraded.

4 shows the fixing part 1500 fastened to the thermocouple support tube 1400 and the second thermocouple 1300. [

Referring to FIG. 4, the fixing unit 1500 is disposed in contact with the other end of the thermocouple support tube 1400, and the atmosphere inside the chamber housing can be sealed through the thermocouple support tube. The fixing part may include a first fixing device 1510, a second fixing device 1520, and a fixing body 1530.

The fixing portion may have a hollow penetrating in the longitudinal direction, and the second thermocouple may be inserted through the hollow.

The fixing part can adjust the degree of external sealing of the inside of the fixing part and the thermocouple support tube through rotation in the first direction or the second direction of the first fixing device 1510.

The fixing part may adjust the degree of external sealing of the inside of the other fixing part and the second thermocouple through rotation of the second fixing device 1530 in the first direction or the second direction.

5 shows a cross-sectional view of the fixing part 1500. As shown in Fig.

The fixing unit 1500 may further include a first fixing member 1541, a second fixing member 1542, a third fixing member 1543 and a fourth fixing member 1544. The first fixing member 1541 and the second fixing member 1542 may function to fix and seal the thermocouple support tube and the third fixing member 1543 and the fourth fixing member 1544 may function to fix The second thermocouple can be fixed and sealed.

The fixed body includes a structure capable of accommodating different diameters at both ends thereof. As shown in FIG. 5, the fixed body 1520 can receive a structure having a larger diameter at a first side, and a second side can receive a structure having a smaller diameter, The central portion of the body may have a hollow structure and may have a structure in which the first side end and the second side end are communicated. The structure having the larger diameter may be a support tube, and the structure having a smaller diameter may be a second thermocouple.

6 illustrates a thermocouple assembly 1000 including a sealing portion 1100, a first thermocouple 1200 and a second thermocouple 1300, a thermocouple support tube 1400, and a fixing portion 1500 according to an embodiment of the present invention. FIG.

6, the thermocouple assemblies may include a first thermocouple and a thermocouple support tube inserted into the first through hole and a second through hole of the sealing portion, respectively, and a second thermocouple may be inserted into the thermocouple support tube . The fixing part 1500 is disposed in contact with the other end of the thermocouple support tube 1400, and the fixing part can seal the atmosphere inside the chamber housing through the thermocouple support tube so as not to flow out to the outside.

For ultra high temperature gas furnace thermocouple  aggregate

According to another aspect of the present invention, there is provided a thermocouple assembly for measuring a temperature inside a chamber housing, the thermocouple assembly for replacing a portion of the chamber housing and including a first and a second through- part; A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole; A thermocouple support tube surrounding at least a part of a second thermocouple surrounding the second thermocouple and inserted into the second through hole, the thermocouple support tube being open at both ends; And a fixing unit disposed at an outer end of the thermocouple support tube exposed to the outside of the chamber housing and fixing the thermocouple support tube and the second thermocouple.

The thermocouple assembly for the ultra-high temperature gas furnace includes all the contents described in the above-mentioned thermocouple assemblies, and is omitted in order to avoid redundant description.

The present invention is not limited to the above-described embodiment and the accompanying drawings, but is intended to be limited by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

100: chamber housing
1000: Thermocouple aggregate
1100: sealing part
1110: first through hole 1120: second through hole
1200: first thermocouple
1300: Second thermocouple
1400: thermocouple support tube
1500:
1510: First fixing device 1520: Fixing body
1530: second fixing device 1541: first fixing member
1542: second fixing member 1543: second fixing member
1544: second fixing member

Claims (7)

A thermocouple assembly for measuring a temperature inside a chamber housing,
A sealing portion disposed to replace a portion of the chamber housing, the sealing portion including first and second through-holes;
A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole;
A hollow thermocouple support tube inserted into the second through hole and having a second thermocouple disposed therein, one end located inside the chamber housing and the other end disposed outside the chamber housing; And
And a fixing unit disposed in contact with the other end of the thermocouple support tube and sealing the atmosphere inside the chamber housing through the thermocouple support tube so as not to flow out to the outside,
Wherein the second thermocouple is smaller in diameter than the first thermocouple and the portion of the second thermocouple not wrapped by the thermocouple support tube is 10 to 30 times the diameter of the second thermocouple.
delete delete The method according to claim 1,
Wherein the diameter of the first thermocouple is between 1/16 "and 1/4".
The method according to claim 1,
And the diameter of the second thermocouple is 0.5 mm to 3.18 mm (1/8 ").
The method according to claim 1,
Wherein the thermocouple support tube comprises at least one of a metal, a ceramic, and a ceramic composite.
1. A thermocouple assembly for an ultra-high temperature gas furnace for measuring a temperature inside a chamber housing,
A sealing portion disposed to replace a portion of the chamber housing, the sealing portion including first and second through-holes;
A first thermocouple inserted into the first through hole and a second thermocouple inserted into the second through hole;
A hollow thermocouple support tube inserted into the second through hole and having a second thermocouple disposed therein, one end located inside the chamber housing and the other end disposed outside the chamber housing; And
And a fixing unit disposed in contact with the other end of the thermocouple support tube and sealing the atmosphere inside the chamber housing through the thermocouple support tube so as not to flow out to the outside,
Wherein the second thermocouple is smaller in diameter than the first thermocouple and the portion of the second thermocouple not covered by the thermocouple support tube is 10 to 30 times the diameter of the second thermocouple.

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