Differential degree repeatable adjustment double stem thermocouple

Abstract

A kind of different degree repeatable adjustment double-branch thermocouple, including protective outer sleeve, large protective inner sleeve is arranged in protective outer sleeve, small protective inner sleeve and K degree thermoelectrode are arranged in the large protective inner sleeve, B degree thermoelectrode is arranged in the small protective inner sleeve, the rear end of the protective outer sleeve is connected and fixed with connecting pipe, the rear end of connecting pipe is connected and fixed with support pipe, support pipe is connected and fixed with sealing assembly by flange, sealing gasket is arranged between flange and sealing assembly to seal, the rear end of sealing assembly is connected and fixed with terminal box, the length of K degree thermoelectrode and B degree thermoelectrode is greater than the maximum length of thermocouple.This thermocouple can measure the whole range of low temperature and high temperature from room temperature to 1700 DEG C, solve the problem that traditional adjustable thermocouple does not have repeatable adjustment product temperature measuring length after assembling product.

Description

Technical Field

[0001] This invention relates to the field of furnace internal temperature measuring devices, specifically to a differentially adjustable dual-branch thermocouple. Background Technology

[0002] The furnace is a three-dimensional space enclosed by furnace walls for fuel combustion. The internal dimensions of this space vary, and it typically presents a high-temperature, high-pressure environment. Accurate and effective measurement of the combustion temperature inside the furnace plays a crucial role in controlling the furnace's process conditions and monitoring its safe operation.

[0003] Currently, the internal temperature measuring devices in the furnace typically start with low-temperature thermocouples of type K to measure temperatures from room temperature to 1100°C. When the furnace temperature rises above 600°C, they are then replaced with high-temperature thermocouples of type B to measure temperatures from 600°C to 1700°C. This is due to the inherent temperature measurement range of the different thermocouple types. However, the process of replacing thermocouples also carries the risk of equipment damage and personnel injury due to high-temperature operation.

[0004] Currently, furnace internal temperature measurement typically involves first determining the installation depth of the furnace temperature sensing hole, then adjusting the length of the temperature sensing device using both the low-temperature thermocouple (made with K-type thermocouples) and the high-temperature thermocouple (made with B-type thermocouples). The thermocouples assembled to this length no longer have the capability for repeated length adjustments. This is because the K-type and B-type thermocouples inside the thermocouple are made of soft materials with relatively small diameters, and readjusting the length could easily lead to breakage due to rotational twisting. However, the installation depth of the furnace internal temperature sensing hole changes continuously with furnace use and maintenance. A mismatch between the furnace temperature sensing hole depth and the length of the temperature sensing device can result in inaccurate temperature measurements. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a differentially adjustable dual-branch thermocouple. This thermocouple can simultaneously measure temperatures across the entire temperature range from room temperature to 1700°C, solving the problem that traditional adjustable thermocouples lack the ability to repeatedly adjust the measuring length after assembly.

[0006] The objective of this invention is achieved through the following solution: a differentially graded, repeatedly adjustable dual-branch thermocouple, comprising a protective outer sleeve, a connecting tube, a support tube, and a flange. A large protective inner sleeve is disposed within the protective outer sleeve; a small protective inner sleeve and a K-grade thermocouple are disposed within the large protective inner sleeve; a B-grade thermocouple is disposed within the small protective inner sleeve. The rear end of the protective outer sleeve is fixedly connected to the connecting tube, and the rear end of the connecting tube is fixedly connected to the support tube. The connecting tube includes a first connecting tube and a second connecting tube. The first connecting tube is connected to the support tube via a rear end for adjusting the thermocouple length. The external thread section of the second connecting pipe is connected and fixed to the internal thread section at the front end of the second connecting pipe, which is used to adjust the length of the thermocouple. The rear end of the second connecting pipe is connected and fixed to the internal thread section of the support pipe through the external thread for adjusting the length of the thermocouple. The support pipe is connected and fixed to the sealing assembly through a flange. A sealing gasket is set between the flange and the sealing assembly for sealing. The rear end of the sealing assembly is connected and fixed to the junction box. The lengths of the K-type thermoelectrode and the B-type thermoelectrode are greater than the maximum length of the thermocouple. The K-type thermoelectrode and the B-type thermoelectrode are arranged in a spiral shape in the second connecting pipe.

[0007] The protective outer sleeve and the connecting pipe are bonded and fixed together with a high-temperature adhesive.

[0008] The front end of the first connecting tube is bonded and fixed to the protective outer sleeve.

[0009] The first connecting pipe has a right-hand external thread on the outer side of its rear end wall, the second connecting pipe has a right-hand internal thread on the inner side of its front end wall, the second connecting pipe has a left-hand external thread on the outer side of its rear end wall, and the support pipe has a left-hand internal thread on the inner side of its front end wall. The first connecting pipe and the second connecting pipe are locked together by a right-hand locking nut, and the second connecting pipe and the support pipe are locked together by a left-hand locking nut.

[0010] The gap between the protective outer sleeve and the first connecting tube is filled with alumina powder for shock absorption, and the outer side of the rear end port of the first connecting tube is provided with high-temperature adhesive to prevent the alumina powder from leaking out.

[0011] The sealing assembly includes a body nut, the rear end of which is threadedly connected to a clamping nut. An integrated guide tube is provided on the inner side of the rear end of the body nut. A four-hole ceramic post is provided on the inner side of the tube wall of the integrated guide tube. A four-hole ceramic post is provided on the inner side of the body nut. A four-hole sealing element is provided between the two four-hole ceramic posts. The holes on the four-hole ceramic posts and the holes on the four-hole sealing element are centered on the same axis and have the same diameter. The rear end of the clamping nut is threadedly connected to a junction box.

[0012] The four-hole ceramic post is an alumina four-hole ceramic post, the four-hole seal is an alumina four-hole seal, and the body nut and the clamping nut are stainless steel nuts.

[0013] The protective outer sleeve is made of a high-temperature resistant, wear-resistant, and erosion-resistant blind-hole ceramic protective material comprising molybdenum disilicide, alumina, and silicon carbide.

[0014] The K-type thermoelectric electrode and the B-type thermoelectric electrode are fixed by a double-hole ceramic tube on their outer side. The double-hole ceramic tube is an alumina double-hole ceramic tube.

[0015] The connecting pipe and support pipe are metal pipes, and the sealing gasket is a copper / nickel metal sealing gasket.

[0016] The advantages of this invention are: this thermocouple can achieve measurement from room temperature to 1700°C with the same thermocouple, the length of the thermocouple can be adjusted by rotating the first connecting tube, the second connecting tube and the support tube, and the breakage of the K-type thermoelectrode and the B-type thermoelectrode due to rotation and twisting is avoided, thus maintaining the normal temperature measurement function of the thermocouple. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the sealing assembly structure. Detailed Implementation

[0018] like Figures 1 to 2As shown, a differentially calibrated, repeatedly adjustable dual-branch thermocouple includes a protective outer tube 1. The protective outer tube 1 is made of a high-temperature resistant, wear-resistant, and erosion-resistant blind-hole ceramic protective material comprising materials such as molybdenum disilicide, alumina, and silicon carbide. A large protective inner tube 2a is disposed within the protective outer tube 1. A small protective inner tube 2b and a K-calibration thermoelectric electrode 3b are disposed within the large protective inner tube 2a. A B-calibration thermoelectric electrode 3a is disposed within the small protective inner tube 2b. A double-hole ceramic tube 4, which is an alumina double-hole ceramic tube, is fixed to the outside of the K-calibration thermoelectric electrode 3b and the B-calibration thermoelectric electrode 3a. The rear end of the protective outer tube 1 is connected and fixed to a connecting pipe 5, and the protective outer tube 1 and the connecting pipe 5 are bonded together using a high-temperature adhesive. The rear end of the connecting pipe 5 is connected and fixed to the support pipe 7. The connecting pipe 5 includes a first connecting pipe 5a and a second connecting pipe 5b. The front end of the first connecting pipe 5a is bonded and fixed to the protective outer sleeve 1. The first connecting pipe 5a is connected and fixed to the front end of the second connecting pipe 5b via an external thread section for adjusting the thermocouple length. The rear end of the second connecting pipe 5b is connected and fixed to the internal thread section of the support pipe 7 via an external thread for adjusting the thermocouple length. The outer side of the rear end wall of the first connecting pipe 5a is provided with a right-hand external thread, the inner side of the front end wall of the second connecting pipe 5b is provided with a right-hand internal thread, the outer side of the rear end wall of the second connecting pipe 5b is provided with a left-hand external thread, and the inner side of the front end wall of the support pipe 7 is provided with a left-hand internal thread. The first connecting pipe 5a and the second connecting pipe 5b are locked by a right-hand locking nut 6a, and the second connecting pipe 5b and the support pipe 7 are locked by a left-hand locking nut 6a. The thread lengths on the first connecting pipe 5a and the second connecting pipe 5b are the same, and the total thread length is the sum of the initial thread length and the thermocouple adjustment length. The gap between the protective outer sleeve 1 and the first connecting pipe 5a is filled with alumina powder for shock absorption, and a high-temperature adhesive is provided on the outer side of the rear end port of the first connecting pipe 5a to prevent the alumina powder from leaking out. The support pipe 7 is connected and fixed to the sealing assembly 10 through the flange 8, and a sealing gasket 9 is provided between the flange 8 and the sealing assembly 10 for sealing. The rear end of the sealing assembly 10 is connected and fixed to the junction box 11. The lengths of the K-type thermoelectrode 3b and the B-type thermoelectrode 3a are greater than the maximum length of the thermocouple. The K-type thermoelectrode 3b and the B-type thermoelectrode 3a are arranged in a spiral shape in the second connecting pipe 5b. The spiral shape of the two thermoelectrodes facilitates the adjustment of the thermocouple length and does not damage the thermoelectrodes.The sealing assembly 10 includes a body nut 10-1, the rear end of which is threadedly connected to a clamping nut 10-3. An integrated guide tube 10-2 is disposed on the inner side of the rear end of the body nut 10-1. A four-hole ceramic post 10-5 is disposed on the inner wall of the integrated guide tube 10-2. A four-hole ceramic post 10-5 is also disposed on the inner side of the body nut 10-1. A four-hole sealing element 10-4 is disposed between the two four-hole ceramic posts 10-5. The holes on the four-hole ceramic posts 10-5 and the holes on the four-hole sealing element 10-4 are centered on the same axis and have the same diameter. The rear end of the clamping nut 10-3 is threadedly connected to a junction box 11. The four-hole ceramic post 10-5 is an alumina four-hole ceramic post, the four-hole sealing element 10-4 is an alumina four-hole sealing element, and the body nut 10-1 and clamping nut 10-3 are stainless steel nuts. The connecting pipe 5 and the support pipe 7 are metal pipes, and the sealing gasket 9 is a copper / nickel metal sealing gasket.

[0019] Thermocouple length adjustment method: Rotate the right-hand locking nut 6a clockwise and the left-hand locking nut 6b counterclockwise. Then, keeping the second connecting tube 5b stationary, simultaneously rotate one side of the first connecting tube 5a and one side of the support tube 7 counterclockwise at the same speed to shorten the thermocouple length. Conversely, keeping the first connecting tube 5b stationary, simultaneously rotate one side of the first connecting tube 5a and one side of the metal support tube 7 clockwise at the same speed to increase the thermocouple length. This avoids the risk of breakage of the K-type thermoelectrode 3b and the B-type thermoelectrode 3a due to rotational twisting, thus maintaining the normal temperature measurement function of the thermocouple and allowing for repeated length adjustment. In this embodiment, the initial thread length of the first connecting tube 5a and the second connecting tube 5b is 60mm. The total thread length can be selected according to actual needs, such as 110mm, 160mm, or 210mm. The thermocouple length adjustment range is ±50mm, ±100mm, or ±150mm.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A differentially adjustable dual-branch thermocouple, characterized in that: The system includes a protective outer sleeve (1), a connecting pipe (5), a support pipe (7), and a flange (8). A large protective inner sleeve (2a) is installed in the protective outer sleeve (1). A small protective inner sleeve (2b) and a K-type thermocouple (3b) are installed in the large protective inner sleeve (2a). A B-type thermocouple (3a) is installed in the small protective inner sleeve (2b). The rear end of the protective outer sleeve (1) is connected and fixed to the connecting pipe (5). The rear end of the connecting pipe (5) is connected and fixed to the support pipe (7). The connecting pipe (5) includes a first connecting pipe (5a) and a second connecting pipe (5b). The first connecting pipe (5a) is connected to the second connecting pipe (5b) via an external threaded section at its rear end for adjusting the thermocouple length. b) The front end is connected and fixed with an internal thread section for adjusting the thermocouple length. The rear end of the second connecting pipe (5b) is connected and fixed with the internal thread section of the support pipe (7) through an external thread for adjusting the thermocouple length. The support pipe (7) is connected and fixed with the sealing assembly (10) through a flange (8). A sealing gasket (9) is provided between the flange (8) and the sealing assembly (10) for sealing. The rear end of the sealing assembly (10) is connected and fixed with the junction box (11). The lengths of the K-type thermoelectrode (3b) and the B-type thermoelectrode (3a) are greater than the maximum length of the thermocouple. The K-type thermoelectrode (3b) and the B-type thermoelectrode (3a) are arranged in a spiral shape in the second connecting pipe (5b).

2. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The protective outer sleeve (1) and the connecting pipe (5) are bonded and fixed together by a high-temperature adhesive.

3. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The front end of the first connecting tube (5a) is bonded and fixed to the protective outer tube (1).

4. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The first connecting pipe (5a) in the connecting pipe (5) has a right-hand external thread on the outer side of its rear end wall, the second connecting pipe (5b) has a right-hand internal thread on the inner side of its front end wall, the second connecting pipe (5b) has a left-hand external thread on the outer side of its rear end wall, and the support pipe (7) has a left-hand internal thread on the inner side of its front end wall. The first connecting pipe (5a) and the second connecting pipe (5b) are locked together by a right-hand locking nut (6a), and the second connecting pipe (5b) and the support pipe (7) are locked together by a left-hand locking nut (6a).

5. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The gap between the protective outer sleeve (1) and the first connecting pipe (5a) is filled with alumina powder for shock absorption, and a high-temperature adhesive is provided on the outer side of the rear end port of the first connecting pipe (5a) to prevent the alumina powder from leaking out.

6. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The sealing assembly (10) includes a body nut (10-1), the rear end of which is threadedly connected to a clamping nut (10-3), an integrated guide tube (10-2) is provided on the inner side of the rear end of the body nut (10-1), a four-hole ceramic column (10-5) is provided on the inner side of the tube wall of the integrated guide tube (10-2), a four-hole ceramic column (10-5) is provided on the inner side of the body nut (10-1), a four-hole sealing element (10-4) is provided between the two four-hole ceramic columns (10-5), the center of the hole on the four-hole ceramic column (10-5) and the hole on the four-hole sealing element (10-4) are located on the same axis and have the same diameter, and the rear end of the clamping nut (10-3) is threadedly connected to the junction box (11).

7. The differentially adjustable dual-branch thermocouple according to claim 6, characterized in that: The four-hole ceramic post (10-5) is an alumina four-hole ceramic post, the four-hole seal (10-4) is an alumina four-hole seal, and the body nut (10-1) and the clamping nut (10-3) are stainless steel nuts.

8. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The protective outer sleeve (1) is made of a high-temperature resistant, wear-resistant, and erosion-resistant blind hole ceramic protective material including molybdenum disilicide, alumina, and silicon carbide.

9. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The K-type thermoelectric electrode (3b) and the B-type thermoelectric electrode (3a) are fixed by a double-hole ceramic tube (4), which is an alumina double-hole ceramic tube.

10. The differentially adjustable dual-branch thermocouple according to claim 1, characterized in that: The connecting pipe (5) and the supporting pipe (7) are metal pipes, and the sealing gasket (9) is a copper / nickel metal sealing gasket.

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