CN202018342U - Internal water flow temperature rise measuring device for water-cooling winding of turbogenerator - Google Patents

Abstract

Translated fromChinese

汽轮发电机水冷绕组内部水流温升测量装置。本实用新型涉及一种汽轮发电机水冷绕组内部水流温升测量装置。用于测水管温度。它克服了已有测量方式得到的温度数值存在偏差的缺陷。它包括热电偶、电荷放大器、A/D转换电路和计算机，所述热电偶的信号输出端连接电荷放大器的信号输入端，电荷放大器的信号输出端连接A/D转换电路的信号输入端，A/D转换电路的信号输出端连接计算机的信号输入端；它还包括弹簧夹子和保温绝热材料覆盖体，保温绝热材料覆盖体的一个面包绕住球状的热电偶的一半，保温绝热材料覆盖体的另一个面固定在弹簧夹子一个钳臂的内表面上。

A device for measuring the temperature rise of water flow inside the water-cooled winding of a turbogenerator. The utility model relates to a device for measuring the temperature rise of water flow inside a steam turbine generator water cooling winding. Used to measure water pipe temperature. It overcomes the defect that the temperature value obtained by the existing measurement method is biased. It includes a thermocouple, a charge amplifier, an A/D conversion circuit and a computer, the signal output of the thermocouple is connected to the signal input of the charge amplifier, and the signal output of the charge amplifier is connected to the signal input of the A/D conversion circuit, A The signal output terminal of the /D conversion circuit is connected to the signal input terminal of the computer; it also includes a spring clip and a thermal insulation material covering body, a bread of the thermal insulation material covering body wraps around half of the spherical thermocouple, and a heat insulating material covering body The other face is secured to the inner surface of one arm of the spring clip.

Description

Translated fromChinese

汽轮发电机水冷绕组内部水流温升测量装置Measuring device for temperature rise of water flow inside water-cooled winding of turbogenerator

技术领域technical field

本实用新型涉及一种汽轮发电机水冷绕组内部水流温升测量装置。The utility model relates to a device for measuring the temperature rise of water flow inside a steam turbine generator water cooling winding.

背景技术Background technique

随着大型汽轮发电机容量的不断扩大，控制发电机定子绕组的温升，使其运行在容许的温升范围内，成为保证发电机安全稳定运行的关键。目前大型汽轮发电机定子绕组冷却普遍采用定子绕组水内冷技术，由于大型发电机定子绕组结构复杂，制造安装难度大，容易造成定子绕组内部水系统流通不畅，因此对大型汽轮发电机定子绕组内部水系统进行试验检查，确保发电机定子绕组内部水系统没有任何堵塞现象很重要。根据“JB/T6228-1992《汽轮发电机绕组内部水系统检验方法及评定》的修订”提供的试验方法指导，需要试验现场首先对发电机定子绕组内冷水加热到高温，然后通以冷却水，直至达到温度稳定。这个过程需要对汽轮发电机水冷绕组内部水流温升进行实时测量，目前对水温的测量都是由人手工在汽轮发电机端部的冷却水流出空心电机绕组后的接管外表面上测量，由于测温元件与接管外表面的接触不良且没有采取任何保温措施，所以测量得到的温度数值存在偏差。With the continuous expansion of the capacity of large turbogenerators, controlling the temperature rise of the stator winding of the generator to make it run within the allowable temperature rise range has become the key to ensure the safe and stable operation of the generator. At present, the stator winding cooling of large turbogenerators generally adopts stator winding water internal cooling technology. Due to the complex structure of the stator windings of large turbogenerators, it is difficult to manufacture and install, and it is easy to cause poor circulation of the water system inside the stator windings. Therefore, for large turbogenerators It is very important to test and check the water system inside the stator winding to ensure that there is no blockage in the water system inside the stator winding of the generator. According to the test method guidance provided by "JB/T6228-1992 "Revision of Inspection Method and Evaluation of Internal Water System of Turbine Generator Winding", it is necessary to heat the cooling water in the stator winding of the generator to a high temperature at the test site first, and then pass the cooling water until the temperature stabilizes. This process requires real-time measurement of the temperature rise of the water flow inside the water-cooled winding of the turbogenerator. At present, the water temperature is measured manually on the outer surface of the nozzle after the cooling water at the end of the turbogenerator flows out of the hollow motor winding. Due to poor contact between the temperature measuring element and the outer surface of the pipe and no insulation measures have been taken, there is a deviation in the measured temperature value.

实用新型内容Utility model content

本实用新型的目的是提供一种汽轮发电机水冷绕组内部水流温升测量装置，以克服已有测量方式得到的温度数值存在偏差的缺陷。它包括热电偶1、电荷放大器2、A/D转换电路3和计算机4，所述热电偶1的信号输出端连接电荷放大器2的信号输入端，电荷放大器2的信号输出端连接A/D转换电路3的信号输入端，A/D转换电路3的信号输出端连接计算机4的信号输入端；它还包括弹簧夹子5和保温绝热材料覆盖体6，保温绝热材料覆盖体6的一个面包绕住球状的热电偶1的一半，保温绝热材料覆盖体6的另一个面固定在弹簧夹子5一个钳臂的内表面上。The purpose of the utility model is to provide a device for measuring the temperature rise of the water flow inside the water-cooled winding of a steam turbine generator, so as to overcome the defect that the temperature value obtained by the existing measurement method is biased. It includes athermocouple 1, acharge amplifier 2, an A/D conversion circuit 3 and a computer 4, the signal output of thethermocouple 1 is connected to the signal input of thecharge amplifier 2, and the signal output of thecharge amplifier 2 is connected to the A/D conversion The signal input terminal ofcircuit 3, the signal output terminal of A/D conversion circuit 3 is connected to the signal input terminal of computer 4; Half of thespherical thermocouple 1, the other face of the thermal insulationmaterial covering body 6 is fixed on the inner surface of a pincer arm of thespring clip 5.

工作时，把弹簧夹子5夹在汽轮发电机端部的冷却水流出接管外表面上，受弹簧夹子的夹紧力作用，热电偶1裸露的半球与接管外表面紧密接触，而热电偶1与弹簧夹子5的钳臂之间以及与空气之间被保温绝热材料覆盖体6包绕住，不会散掉热量，因此得到的测量值准确、无误差，克服了已有测量方式得到的温度数值存在偏差的缺陷。When working, thespring clip 5 is clamped on the outer surface of the cooling water outlet pipe at the end of the turbogenerator. Under the clamping force of the spring clip, the exposed hemisphere of thethermocouple 1 is in close contact with the outer surface of the pipe, while thethermocouple 1 Between the pincer arm of thespring clip 5 and between the air and the heat-insulatingmaterial cover 6, the heat will not be dissipated, so the measured value obtained is accurate and error-free, overcoming the temperature obtained by the existing measurement method There is a defect in the deviation of the numerical value.

附图说明Description of drawings

图1是本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.

具体实施方式Detailed ways

具体实施方式一：下面结合图1具体说明本实施方式。本实施方式包括热电偶1、电荷放大器2、A/D转换电路3和计算机4，所述热电偶1的信号输出端连接电荷放大器2的信号输入端，电荷放大器2的信号输出端连接A/D转换电路3的信号输入端，A/D转换电路3的信号输出端连接计算机4的信号输入端；它还包括弹簧夹子5和保温绝热材料覆盖体6，保温绝热材料覆盖体6的一个面包绕住球状的热电偶1的一半，保温绝热材料覆盖体6的另一个面固定在弹簧夹子5一个钳臂的内表面上。Specific Embodiment 1: The present embodiment will be specifically described below with reference to FIG. 1 . The present embodiment comprisesthermocouple 1,charge amplifier 2, A/D conversion circuit 3 and computer 4, and the signal output end of describedthermocouple 1 is connected the signal input end ofcharge amplifier 2, and the signal output end ofcharge amplifier 2 is connected A/D The signal input end of theD conversion circuit 3, the signal output end of the A/D conversion circuit 3 is connected to the signal input end of the computer 4; Around the half of thespherical thermocouple 1, the other face of the thermalinsulation material cover 6 is fixed on the inner surface of a pincer arm of thespring clip 5.

具体实施方式二：本实施方式与实施方式一的不同点是：热电偶1为锰康铜热电偶，由锰铜线的端部与康铜线的端部烧结在一起而成。Embodiment 2: The difference between this embodiment andEmbodiment 1 is that thethermocouple 1 is a manganese-constantan thermocouple, which is formed by sintering the ends of the manganese-copper wire and the constantan wire.

具体实施方式三：本实施方式与实施方式一的不同点是：保温绝热材料覆盖体6采用保温毡。Embodiment 3: The difference between this embodiment andEmbodiment 1 is that: the thermal insulationmaterial covering body 6 adopts thermal insulation felt.

Claims (3)

1. turbodynamo water-cooled winding water flow inside warm raising measurement set, it comprises thermopair (1), charge amplifier (2), A/D change-over circuit (3) and computing machine (4), the signal output part of described thermopair (1) connects the signal input part of charge amplifier (2), the signal output part of charge amplifier (2) connects the signal input part of A/D change-over circuit (3), and the signal output part of A/D change-over circuit (3) connects the signal input part of computing machine (4); It is characterized in that it also comprises spring clip (5) and heat-insulation material nappe (6), a loaf of bread of heat-insulation material nappe (6) is put half of spherical thermopair (1) on the spot, and another face of heat-insulation material nappe (6) is fixed on the inside surface of (5) tong arms of spring clip.

2. turbodynamo water-cooled winding water flow inside warm raising measurement set according to claim 1 is characterized in that thermopair (1) is the manganese copper-constantan thermocouple.

3. turbodynamo water-cooled winding water flow inside warm raising measurement set according to claim 1 is characterized in that heat-insulation material nappe (6) adopts insulation quilt.

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