Ing teknik pipeline, pilihan valves listrik sing bener minangka salah sawijining kahanan njamin kanggo nyukupi syarat panggunaan. If the electric valve used is not selected properly, it will not only affect the use, but also bring adverse consequences or serious losses, therefore, the correct selection of electric valves in the pipeline engineering design.
Lingkungan kerja saka katup listrik
In addition to paying attention to the pipeline parameters, special attention should be paid to the environmental conditions of its operation, because the electric device in the electric valve is an electromechanical equipment, and its working condition is greatly affected by its working environment. Biasane, lingkungan kerja saka katup listrik kaya ing ngisor iki:
1. Instalasi njero ruangan utawa panggunaan ruangan kanthi langkah pelindung;
2. Instalasi ruangan ing udhara sing mbukak, kanthi angin, wedhi, udan lan embun, srengenge lan erosi liyane;
3 .. Wis gas utawa lingkungan sing gampang njeblug utawa lingkungan;
4. Lingkungan humid, tropis garing;
5. Suhu medium pipa paling dhuwur 480 ° C utawa ndhuwur;
6. Suhu sekitar ing ngisor -20 ° C;
7 .. Gampang dibungkus utawa dicemplungake ing banyu;
8. Lingkungan karo bahan radioaktif (tanduran tenaga nuklir lan piranti test radioaktif);
9. Lingkungan kapal utawa dermaga (kanthi semprotan uyah, cetakan, lan kelembapan);
10. kesempatan kanthi geter abot;
11. OCCALIONSIONS FRONE kanggo FIRE;
For the electric valves in the above-mentioned environments, the structure, materials and protective measures of the electric devices are different. Mula, piranti listrik katup sing cocog kudu dipilih miturut lingkungan kerja ing ndhuwur.
Keperluan fungsional kanggo listrikkatup
Miturut syarat kontrol rekayasa, kanggo katup listrik, fungsi kontrol wis rampung dening piranti listrik. The purpose of using electric valves is to realize non-manual electrical control or computer control for the opening, closing and adjustment linkage of valves. Piranti listrik saiki ora mung digunakake kanggo nylametake tenaga kerja. Due to the large differences in the function and quality of products from different manufacturers, the selection of electric devices and the selection of valves are equally important to the project.
Kontrol listrik listrikkatup
Due to the continuous improvement of the requirements of industrial automation, on the one hand, the use of electric valves is increasing, and on the other hand, the control requirements of electric valves are getting higher and more complex. Mula, desain valves listrik ing babagan kontrol listrik uga terus dianyari. With the progress of science and technology and the popularization and application of computers, new and diverse electrical control methods will continue to appear. Kanggo kontrol sakabehe listrikkatup, perhatian kudu dibayar kanggo pilihan mode kontrol katup listrik. For example, according to the needs of the project, whether to use the centralized control mode, or a single control mode, whether to link with other equipment, program control or the application of computer program control, etc., the control principle is different. The sample of the valve electric device manufacturer only gives the standard electrical control principle, so the use department should make a technical disclosure with the electric device manufacturer and clarify the technical requirements. Kajaba iku, nalika milih katup listrik, sampeyan kudu mikir manawa tuku pengontrol valver listrik tambahan. Amarga umum, pengontrol kudu dituku kanthi kapisah. In most cases, when using a single control, it is necessary to purchase a controller, because it is more convenient and cheaper to purchase a controller than to design and manufacture it by the user. When the electrical control performance can not meet the engineering design requirements, the manufacturer should be proposed to modify or redesign.
The valve electric device is a device that realizes valve programming, automatic control and remote control*, and its motion process can be controlled by the amount of stroke, torque or axial thrust. Since the operating characteristics and utilization rate of the valve actuator depend on the type of valve, the working specification of the device, and the position of the valve on the pipeline or equipment, the correct selection of the valve actuator is essential to prevent overload (the working torque is higher than the control torque). Umumé, dhasar kanggo pilihan piranti listrik val sing bener kaya ing ngisor iki:
There are two main machine structures for operating the thrust valve electric device: one is not equipped with a thrust disc and directly outputs torque; Liyane yaiku ngatur piring trobosan, lan torsi output diowahi dadi output throve liwat nut stem ing plate thrust.
katupgagang).
Yen kacepetan pambuka lan nutup saka katup kacepetan output kanthi cepet, gampang kanggo ngasilake palu banyu. Mulane, kacepetan mbukak lan nutup sing cocog kudu dipilih miturut kahanan sing beda.
Pintu Valve duwe syarat khusus dhewe, yaiku kudu netepake pasukan torsi utawa axial. BiasanekatupAktuator nggunakake pasangan torsi. Nalika ukuran piranti listrik ditemtokake, torsi kontrol uga ditemtokake. Umume mlayu ing wektu sing wis ditemtokake, motor ora bakal kakehan kakehan. However, if the following situations occur, it may lead to overload: first, the power supply voltage is low, and the required torque cannot be obtained, so that the motor stops rotating; the second is to mistakenly adjust the torque limiting mechanism to make it greater than the stopping torque, resulting in continuous excessive torque and stopping the motor; Sing nomer telu yaiku nggunakake intermiten, lan akumulasi panas ngasilake ngluwihi suhu sing diidini munggah regane motor; Papat, sirkuit mekanisme mbatesi mekanisme gagal amarga ana sebab, sing ndadekake torsi gedhe; Kalima, suhu sekitar dhuwur banget, sing nyuda kapasitas panas motor kasebut.
In the past, the method of protecting the motor was to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have their own advantages and disadvantages. Ora ana cara pangayoman sing dipercaya kanggo peralatan beban variabel kayata piranti listrik. Therefore, various combinations must be adopted, which can be summarized into two kinds: one is to judge the increase or decrease of the input current of the motor; Sing nomer loro yaiku ngadili kahanan pemanasan motor kasebut dhewe. Ing salah siji cara, salah siji cara kanggo miwiti wates wates saka kapasitas panas motor.
Generally, the basic protection method of overload is: overload protection for continuous operation or jog operation of the motor, using a thermostat; Kanggo perlindungan stall rotor motor, relay termal diadopsi; Kanggo kacilakan sirkuit cendhak, sekring utawa relay sing overcurrent digunakake.
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Wektu Pos: Nov-26-2024
