CN111863320A

CN111863320A - Flexible high-precision K-type thermocouple sensor cable

Info

Publication number: CN111863320A
Application number: CN202010729267.XA
Authority: CN
Inventors: 赖恒俊; 朱云川
Original assignee: Kunshan Advanced Microwave Technologies Co ltd
Current assignee: Jiangsu Anshengda Aerospace Technology Co.,Ltd.
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-10-30
Anticipated expiration: 2040-07-27
Also published as: CN111863320B

Abstract

The invention relates to the technical field of temperature sensors, in particular to a flexible high-precision K-type thermocouple sensor cable which comprises a positive wire core and a negative wire core which are wrapped in the same protective layer, wherein insulating layers are respectively arranged outside the positive wire core and the negative wire core; the positive wire core is made of nickel-chromium-silicon alloy and comprises 8.96-10.36 wt% of Cr, 0.46-0.59 wt% of Si, 0.36-0.48 wt% of Fe, 0.02-0.09 wt% of Mn and the balance of Ni; the material of the negative wire core is nickel-aluminum-manganese alloy, and the negative wire core comprises 1.61-1.80 wt% of Al, 1.56-1.69 wt% of Mn, 0.11-0.16 wt% of Fe, 0.58-0.69 wt% of Co, 1.35-1.59 wt% of Si, 0.01-0.06 wt% of C and the balance of Ni. The flexible high-precision K-type thermocouple sensor cable can be manufactured at any length under the condition of meeting continuous production, is soft in structure, can ensure a relatively accurate linear relation between a potential value and the temperature in the use range of 0-1000 ℃, and can be used at the high temperature of 1300 ℃.

Description

Flexible high-precision K-type thermocouple sensor cable

Technical Field

The invention relates to the technical field of temperature sensors, in particular to a flexible high-precision K-type thermocouple sensor cable.

Background

With the development of science and technology, the demand for high-performance materials and parts is increasing, and thus higher requirements are put forward on the processing technology of the materials and the parts. By controlling key process parameters such as temperature, time and the like, the material can be endowed with expected properties in the hot working process, and the precise temperature control plays a crucial role in influencing the material properties in the hot working process. The hot working process can endow the material with expected performance, and the high temperature measurement is the basis and the core for ensuring the control of the hot working process and is the specification for carrying out system control on the whole hot working process from the raw material to the part manufacturing. The high temperature measurement is used for temperature test and calibration of hot working equipment to ensure effective control of the temperature of parts and raw materials in the hot working process, and is a very important link in the hot working process.

In the traditional technical field, a plurality of sensor products for measuring temperature can be provided, but on the premise of meeting the high precision of the products, the measuring temperature range can also meet the sensor of 0-1300 ℃, and only a thermocouple can be used.

The requirements of national and foreign cheap metal thermocouple tolerance (precision) standards are shown in table 1.

Table 1:

the domestic and foreign noble metal thermocouple temperature ranges and maximum tolerance standard requirements are shown in table 2.

Table 2:

although the noble metal R-type, S-type and B-type thermocouples meet various technical indexes, the comprehensive cost is too high, from the perspective of users, the production, manufacturing and maintenance costs are relatively high for production enterprises, and the armored thermocouple sensor made of the traditional armored thermocouple cable in the cheap metal thermocouple has the following problems:

1. the traditional thermocouple products have fewer high-precision products at all temperature points from a low-temperature section to a high-temperature section, the universal precision only meets the national standard level 1 precision (the product tolerance is less than or equal to +/-1.5 ℃ at 0-375 ℃, and less than or equal to 0.4% · | t | at 375-1000 ℃), and the application range of the products is limited in the hot processing process;

2. the product has large volume, heavy weight, poor repeated bending performance and easy breakage, and influences on-site laying, testing and operation;

3. the product is limited in use length to a certain extent, and cannot be laid for a long distance, so that field use is affected;

therefore, there is a need to provide a new structure of flexible, high temperature resistant, high precision K-type thermocouple sensor to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a flexible high-precision K-type thermocouple sensor cable which can be used for manufacturing a high-precision K-type thermocouple sensor with good bending resistance and convenient length extension.

The invention realizes the purpose through the following technical scheme: a flexible high-precision K-type thermocouple sensor cable comprises a positive wire core and a negative wire core which are wrapped in the same protective layer, wherein insulating layers are respectively arranged outside the positive wire core and the negative wire core; the positive wire core is made of nickel-chromium-silicon alloy and comprises 8.96-10.36 wt% of Cr, 0.46-0.59 wt% of Si, 0.36-0.48 wt% of Fe, 0.02-0.09 wt% of Mn and the balance of Ni; the material of the negative wire core is nickel-aluminum-manganese alloy, and the negative wire core comprises 1.61-1.80 wt% of Al, 1.56-1.69 wt% of Mn, 0.11-0.16 wt% of Fe, 0.58-0.69 wt% of Co, 1.35-1.59 wt% of Si, 0.01-0.06 wt% of C and the balance of Ni.

Specifically, the insulating layer and the protective layer are woven by high-temperature resistant fibers, and the high-temperature resistant fibers are one of alumina long-thread fibers, polycrystalline mullite long fibers, high-alumina long fibers, aluminum silicate long fibers, quartz glass long fibers or high-silica long fibers.

Specifically, the insulating layer adopts a long fiber wire with the diameter of 0.05 mm-1.0 mm after being stranded, and the insulating thickness is 0.10 mm-3.0 mm.

Specifically, a metal armor protective layer woven by high-temperature-resistant alloy wires is further arranged outside the protective layer, and the metal armor protective layer is made of a material selected from a chromium-nickel alloy, a chromium-aluminum-rhenium alloy, a chromium-aluminum-niobium alloy or a chromium-aluminum-molybdenum alloy.

Furthermore, the diameter of the high-temperature resistant alloy wire of the metal armor woven protective layer is 0.05 mm-0.25 mm, and the weaving density is 65% -95%.

By adopting the technical scheme, the technical scheme of the invention has the beneficial effects that:

the flexible high-precision K-type thermocouple sensor cable can be manufactured at any length under the condition of meeting the requirement of continuous production, and the manufactured sensor potential value and the temperature can ensure a relatively accurate linear relation in the use range of 0-1000 ℃, and can be used at the high temperature of 1300 ℃.

Drawings

FIG. 1 is a cross-sectional view of an embodiment flexible high-precision K-type thermocouple sensor cable;

fig. 2 is a screenshot of calibration and detection data of the manufactured thermocouple sensor in a third-party calibration institution in China according to the technical scheme of the embodiment 1.

The figures in the drawings represent:

1 a-positive wire core, 1 b-negative wire core;

2 a-positive insulating layer, 2 b-negative insulating layer;

3-a protective layer;

4-a metallic armor protective layer.

Detailed Description

As shown in fig. 1, the flexible high-precision K-type thermocouple sensor cable of the present invention includes an anode wire core 1a and a cathode wire core 1b wrapped in the same protective layer 3, wherein an anode insulating layer 2a is disposed outside the anode wire core 1a, and a cathode insulating layer 2b is disposed outside the cathode wire core 1 b; the positive wire core 1a is made of nickel-chromium-silicon alloy and comprises 8.96-10.36 wt% of Cr, 0.46-0.59 wt% of Si, 0.36-0.48 wt% of Fe, 0.02-0.09 wt% of Mn and the balance of Ni; the material of the negative wire core 1b is nickel-aluminum-manganese alloy, and the negative wire core comprises 1.61-1.80 wt% of Al, 1.56-1.69 wt% of Mn, 0.11-0.16 wt% of Fe, 0.58-0.69 wt% of Co, 1.35-1.59 wt% of Si, 0.01-0.06 wt% of C and the balance of Ni. The flexible high-precision K-type thermocouple sensor cable can be manufactured at any length under the condition of continuous production.

The present invention will be described in further detail with reference to specific examples.

Examples 1 to 3:

positive and negative fiber cores were prepared according to the formulation shown in table 3, each calculated at 100 wt%. The positive electrode material and the negative electrode material are made of alloy materials with the diameter of 0.51mm, a thermocouple cable with the length of 900 meters is produced, then the head (the head of a reel) and the tail (the tail of the reel) of the thermocouple cable are sampled, a sampling product is welded to manufacture a thermocouple sensor, and then the product is measured and calibrated.

Table 3: unit: wt.%

Table 4 shows data of the K-type thermocouples manufactured in examples 1 to 3, which were calibrated at a time of a hundred degrees from 100 ℃ to 1000 ℃.

Table 4:

from the calibration data in table 4 and fig. 2, it can be known that, in the calibration range of 0-1000 ℃, the temperature calibration error of the K-type thermocouple sensor cable is less than or equal to ± 1.0 ℃, even a part of temperature intervals can reach within ± 0.5 ℃, the two sensors calibrate temperature points in the same way, the deviation between calibration values is less than or equal to 0.3 ℃, and it is shown that the more accurate linear relationship between the potential value and the temperature can be ensured in the temperature range of 0-1000 ℃. The temperature measurement precision of the product is higher than the industrial standard of national, internal and external cheap metal thermocouples, and part of application fields can even directly replace noble metal thermocouples.

As shown in fig. 1, a metal armor protective layer 4 woven by high temperature resistant alloy wires is arranged outside the protective layer 3, and the material of the metal armor protective layer 4 is selected from a chromium-nickel alloy, a chromium-aluminum-rhenium alloy, a chromium-aluminum-niobium alloy or a chromium-aluminum-molybdenum alloy. These alloy materials are able to withstand high temperatures of 1300 ℃, and are able to protect internal structures under physical impact and thermal shock.

According to experience, the cable is made of the following materials with good effect, the outer diameters of the positive and negative wire cores 1a and 1b are 0.1-3.25 mm, the

insulating layers

2a and 2b are long fiber wires which are stranded and have the diameters of 0.05-1.0 mm, the insulating thickness is 0.10-3.0 mm, the diameter of the high-temperature resistant alloy wire of the metal armor weaving protective layer 4 is 0.05-0.25 mm, and the weaving density is 65-95%.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A flexible high-precision K-type thermocouple sensor cable comprises a positive wire core and a negative wire core which are wrapped in the same protective layer, wherein insulating layers are respectively arranged outside the positive wire core and the negative wire core; the positive wire core is made of nickel-chromium-silicon alloy and comprises 8.96-10.36 wt% of Cr, 0.46-0.59 wt% of Si, 0.36-0.48 wt% of Fe, 0.02-0.09 wt% of Mn and the balance of Ni; the material of the negative wire core is nickel-aluminum-manganese alloy, and the negative wire core comprises 1.61-1.80 wt% of Al, 1.56-1.69 wt% of Mn, 0.11-0.16 wt% of Fe, 0.58-0.69 wt% of Co, 1.35-1.59 wt% of Si, 0.01-0.06 wt% of C and the balance of Ni.

2. The flexible high-precision K-type thermocouple sensor cable according to claim 1, characterized in that: the insulating layer and the protective layer are woven by high-temperature resistant fibers, and the high-temperature resistant fibers are one of long alumina fiber, polycrystalline mullite long fiber, high-alumina long fiber, aluminum silicate long fiber, quartz glass long fiber or high-silica long fiber.

3. The flexible high-precision K-type thermocouple sensor cable according to claim 1, characterized in that: the insulating layer adopts a long fiber wire with the diameter of 0.05 mm-1.0 mm after being stranded, and the insulating thickness is 0.10 mm-3.0 mm.

4. The flexible high-precision K-type thermocouple sensor cable according to claim 1, characterized in that: and a metal armor protective layer woven by high-temperature-resistant alloy wires is further arranged outside the protective layer, and the metal armor protective layer is made of a material selected from a chromium-nickel alloy, a chromium-aluminum-rhenium alloy, a chromium-aluminum-niobium alloy or a chromium-aluminum-molybdenum alloy.

5. The flexible high-precision K-type thermocouple sensor cable according to claim 4, wherein: the diameter of the high-temperature resistant alloy wire of the metal armor woven protective layer is 0.05 mm-0.25 mm, and the weaving density is 65% -95%.