CN202928708U - Contact temperature measuring sensor with short thermal response time - Google Patents

Contact temperature measuring sensor with short thermal response time Download PDF

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Publication number
CN202928708U
CN202928708U CN 201220475224 CN201220475224U CN202928708U CN 202928708 U CN202928708 U CN 202928708U CN 201220475224 CN201220475224 CN 201220475224 CN 201220475224 U CN201220475224 U CN 201220475224U CN 202928708 U CN202928708 U CN 202928708U
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CN
China
Prior art keywords
response time
protection tube
thermal response
measuring sensor
temperature measuring
Prior art date
Application number
CN 201220475224
Other languages
Chinese (zh)
Inventor
戈尔谷
尹泽辉
Original Assignee
长沙有色冶金设计研究院有限公司
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Priority to CN 201220475224 priority Critical patent/CN202928708U/en
Application granted granted Critical
Publication of CN202928708U publication Critical patent/CN202928708U/en

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Abstract

The utility model discloses a contact temperature measuring sensor with short thermal response time. The contact temperature measuring sensor with short thermal response time comprises metal wire and a protection tube, wherein the wire is packaged in the protection tube metal, the protection tube metal is internally filled with heat conduction silicone rubber material, and the metal wire is arranged in the heat conduction silicone rubber material. An air layer or magnesium oxide powder in a protection tube head portion of a thermocouple or a thermal resistor in the prior art are replaced by a silicone rubber bending sheet having properties of high heat conduction coefficient and electrical isolation, so the contact temperature measuring sensor can be under the conditions of 200 DEG C in a long term and greatly reduces thermal response time of the thermocouple or the thermal resistor while safe and reliable temperature measurement is guaranteed. Energy saving of a temperature-control system during operation and safety protection of large process flow equipment can be improved.

Description

The contact type temperature measuring sensor that a kind of thermal response time is short
Technical field
The utility model relates to a kind of sensor for measuring temperature of industrial flow equipment.
Background technology
The application of industrial heat galvanic couple (resistance) thermometry has 160 years history, and its monitoring to vast industrial flow and equipment plays important basic role.
The principle of thermopair is in the closed-loop path that two kinds of different tinsels form, and during higher than the connector temperature of the other end, the contact electricity that two joints produce is different, forms potential difference (PD), has electric current to pass through in the closed-loop path when the connector temperature of an end.Under cold junction temperature is stable, measure this current potential difference, measured hot-side temperature with regard to correspondence.
Thermal resistance is to utilize certain tinsel in a certain temperature range, and the corresponding relation of its resistance value and temperature is measured temperature by measuring this Electric Resistance Value of Metal.
Structure such as Fig. 1 of industrial common thermocouple (resistance) head comprise tinsel, protection tube.800 0Below C, protection tube is generally copper protection tube or stainless steel protection pipe.Standard GB/T/T16839-1997 has stipulated its performance; Their technical conditions have been stipulated in GB/T9238-1999, GB/T5978-1986.In industrial application, basically satisfy production requirement, for requiring the short occasion of thermal response time, exposed type and armored type GB/T18404-2001 thermopair are arranged, see Fig. 2.Common thermopair (resistance) thermal response time such as following table 1:
Table 1 common thermocouple (resistance) thermal response time
Armored type thermal response time such as table 2
The table 2 armored type hot thermocouple response time
The armored type hot thermocouple response time is as follows:
Common armored type assembled thermopair (resistance) thermal response time≤60s;
Reducing type armored type assembling thermopair (resistance) thermal response time≤24s.
Common thermocouple (resistance) thermal response time 0.5 τ reaches 180-300s as seen from Table 1, and the time of τ also will double, and assembled armored type thermal response time 0.5 τ also wants 24-60s.Long thermal response time is difficult to satisfy the more and more higher automatically-monitored requirement of technological process like this, and the open armoring type thermopair (resistance) of table 2 can only be used in condition minority occasion preferably.Most technological process thermometric is with φ 16, φ 20, φ 25 protection tubes, and their thermometric thermal response time is oversize, for very labile combustion process, extended and controlled the settling time that reaches stable state, invisible increase a large amount of energy consumptions.
With regard to industrial stove, whole nation consumption coal is more than 1,000,000,000 tons, and each stove needs thermometric, and due to the hysteresis in thermometric reaction time, the invisible energy consumption of bringing is appreciable.In the safeguard protection of main equipment (as steam turbine, generator, large blower fan, large equipment etc.), temperature survey is one of security guard, reflects rapidly the overtemperature state, to the safety of large equipment and life-extending key effect arranged.Therefore must recognize the thermal response time that reduces temperature thermocouple (resistance), be the major issue of benefiting the nation and the people, saving energy and reduce the cost.
Six during the last ten years, and the protection tube structure and material of domestic thermopair (resistance) improves few, continues to use external old structure and material.Manufacturing plant lacks the enough understanding to technological process, safety and energy consumption waste, notes not reducing the thermometric thermal response time.
(table 3 is heat-transfer path and coefficient of heat conductivity under different temperatures) analyzed in the path that Fig. 1 common thermocouple conducts heat, by being main Calculation of Heat Transfer to hot conduction under different temperatures, convection current, radiation, drawn following analysis:
Heat-transfer path and coefficient of heat conductivity under table 3 different temperatures
The principal element that affects the hot thermocouple response time has:
1. at low, the middle temperature of heat by conduction and convection heat transfer' heat-transfer by convection, common thermocouple heat-transfer path hollow gas-bearing formation is high more than protection tube wall heat transfer resistance, and more than 99 times, it is long principal element of hot thermocouple response time.
2. the insulating heat-conductive filler of armoured thermocouple is magnesia powder 5, its coefficient of heat conductivity 0.07w/m.k.Ceramic little more than 10 times than under relevant temperature, than the little 500-1000 of steel doubly.Though therefore magnesia powder can insulate, coefficient of heat conductivity is little, is to cause long factor of hot thermocouple response time.Contrast table 2 reveals 3 kinds of structures (revealing end, body contact, insulation) of the thermal response time Φ 8 of armoured thermocouples, and " insulation " be " dew is held " 8 times, with the increase of diameter, also is the increase of no-load voltage ratio, reaches 60 times after adding installation sleeve.
Summary of the invention
Technical problem to be solved in the utility model is for the prior art deficiency, to provide a kind of sensor for measuring temperature, the thermal response time of reduction sensor for measuring temperature.
For solving the problems of the technologies described above; the technical scheme that the utility model adopts is: the contact type temperature measuring sensor that a kind of thermal response time is short; comprise tinsel, protection tube; described tinsel is encapsulated in protection tube; be filled with the heat-conducting silicon rubber material in described protection tube head, described tinsel is placed in the heat-conducting silicon rubber material.
Due to 250 ℃ of the high-temperature resistants of silicon rubber, thus the utility model under less than 200 ℃, but long-term work.
Compared with prior art; the beneficial effect that the utility model has is: sensor for measuring temperature of the present utility model and heat-conducting silicon rubber roll bending electrical isolation high with coefficient of heat conductivity replaced air layer or the magnesia powder in existing thermopair (resistance) protection tube head; because the coefficient of heat conductivity of heat-conducting silicon rubber is 100 times of left and right of air-gap or magnesia powder, therefore temperature sensor of the present utility model has reduced the thermometric thermal response time greatly.
Description of drawings
Fig. 1 is common thermocouple head construction schematic diagram;
Fig. 2 is armored type thermopair head structural representation; (a) exposed type thermopair head structural representation; (b) common armored type assembled thermopair head structural representation; (c) reducing insulation armored type assembling thermopair head structural representation;
Fig. 3 (a) is the utility model one embodiment thermopair head structural representation;
Fig. 3 (b) is the utility model one embodiment thermal resistance head construction schematic diagram.
Embodiment
As shown in Figure 3, the utility model one embodiment comprises tinsel 3, protection tube 1, and described tinsel 3 is encapsulated in protection tube 1, is filled with heat-conducting silicon rubber material 6 in described protection tube 1 head, and described tinsel is placed in heat-conducting silicon rubber material 6.
As shown in Fig. 3 (a); sensor for measuring temperature is the head improved thermocouple; comprise the insulated porcelain sleeve 2 that is encapsulated in protection tube, described tinsel 3 one ends pass respectively insulated porcelain sleeve and guide thermopair terminal box with Instrument connection into, and described tinsel 3 other end solder sphere are thermometric hot junction 4.
As shown in Fig. 3 (b), sensor for measuring temperature is head improved hot resistance, and described tinsel 3 is platinum filament, and described platinum filament is by the 10 thermal resistance terminal boxes that are connected to Instrument connection that go between.
According to nose shape in protection tube, the heat-conducting silicon rubber material can be done in flakes or roll bending.
Temperature sensor of the present utility model is applicable to the thermometric environment below 200 ℃.
Table 4 air-gap, magnesium oxide, heat-conducting silicon rubber coefficient of heat conductivity, insulation resistance and the withstand voltage under corresponding working temperature
By table 4, the thermal conductivity ratio of heat-conducting silicon rubber and air-gap or magnesia powder is used for substituting protection tube hollow air-gap or magnesia powder in 100 left and right, and will make the entire thermal resistance of thermopair (resistance) heat-transfer path is below 1% of traditional structure.
The insulation resistance of heat-conducting silicon rubber is very high, does not affect the measuring-signal correctness of thermopair (resistance).

Claims (1)

1. contact type temperature measuring sensor that thermal response time is short; comprise tinsel, protection tube, described tinsel is encapsulated in protection tube, it is characterized in that; be filled with the heat-conducting silicon rubber material in described protection tube head, described tinsel is placed in the heat-conducting silicon rubber material.
CN 201220475224 2012-09-18 2012-09-18 Contact temperature measuring sensor with short thermal response time CN202928708U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220475224 CN202928708U (en) 2012-09-18 2012-09-18 Contact temperature measuring sensor with short thermal response time

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Application Number Priority Date Filing Date Title
CN 201220475224 CN202928708U (en) 2012-09-18 2012-09-18 Contact temperature measuring sensor with short thermal response time

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CN202928708U true CN202928708U (en) 2013-05-08

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104374494A (en) * 2014-11-18 2015-02-25 中国人民解放军63655部队 Packaging structure for thermistor temperature coefficient calibration
CN105606242A (en) * 2015-09-24 2016-05-25 中冶长天国际工程有限责任公司 Activated carbon desulfurization system and temperature detection device thereof
CN105716754A (en) * 2016-02-17 2016-06-29 中国科学院南海海洋研究所 Rock stratum stress variation temperature response monitoring device
CN109456737A (en) * 2018-11-12 2019-03-12 天津航空机电有限公司 A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104374494A (en) * 2014-11-18 2015-02-25 中国人民解放军63655部队 Packaging structure for thermistor temperature coefficient calibration
CN105606242A (en) * 2015-09-24 2016-05-25 中冶长天国际工程有限责任公司 Activated carbon desulfurization system and temperature detection device thereof
CN105606242B (en) * 2015-09-24 2019-11-19 中冶长天国际工程有限责任公司 A kind of active carbon desulfurization system and its temperature-detecting device
CN105716754A (en) * 2016-02-17 2016-06-29 中国科学院南海海洋研究所 Rock stratum stress variation temperature response monitoring device
CN105716754B (en) * 2016-02-17 2018-06-22 中国科学院南海海洋研究所 A kind of terrane stress transformation temperature responds monitoring device
US10114147B2 (en) 2016-02-17 2018-10-30 South China Sea Institute Of Oceanology, Chinese Academy Of Sciences Device for monitoring temperature response to stress change in strata
CN109456737A (en) * 2018-11-12 2019-03-12 天津航空机电有限公司 A kind of heat filling for temperature sensor, the temperature sensor comprising it and purposes

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TR01 Transfer of patent right

Effective date of registration: 20180427

Address after: 411100 98 Fuzhou Road, Jiuhua demonstration area, Xiangtan, Hunan

Patentee after: Hua Chu hi tech (Hunan) Co., Ltd.

Address before: No. 199 Jiefang Road, Changsha, Hunan Province

Patentee before: Changsha Engineering & Research Institute of Nonferrous Metallurgy Co., Ltd.

TR01 Transfer of patent right