Yengil beton qo'shimchalari | Uyali beton uchun yuqori samarali ko'pikli moddalar
What is foam generator?
Ko'pikli mashina, ko'pik generatori sifatida ham tanilgan, ko'pikli vositani suvli eritmaning ma'lum konsentratsiyasiga yetkazadigan ko'pikli uskunaning bir turi. Ko'pikli vositaning o'zi avtomatik ravishda ko'pikka aylana olmaydi, it must pass the mechanical action of the foaming machine to become foam.
What is the principle of the foam generator?
Ko'pik generatoridan qat'i nazar, ko'piklanishning asosiy printsipi ko'pikli vosita eritmasiga havo kiritishdir. Har xil turdagi o'zgarishlar gazni kiritish usulida farq qiladi, shuning uchun ta'sir ham boshqacha.
Ko'pik hosil bo'lishi uchun ikkita zarur omil mavjud, one is foaming agent solution, ikkinchisi esa havo, both of which are indispensable. Puflovchi vosita eritmasisiz, gazni o'rab turgan suyuq plyonka hosil bo'lmaydi va pufakchalar bo'lmaydi. Va gazsiz, ko'pikli vosita eritmasi faqat pufakchalar hosil qila olmaydi.
Pufakchani shakllantirish tizimida, puflovchi vosita eritmasi dispersion muhit hisoblanadi, gaz dispers fazadir, va gaz pufakchalar hosil qilish uchun suyuqlikda tarqaladi, va keyin ko'p pufakchalar ko'pik hosil qiladi. Shamollatish agenti ishlashining muhim omiliga qo'shimcha ravishda, puflovchi vosita eritmasiga gazning kiritilishi yana bir muhim omil hisoblanadi. Ko'pik generatorining printsipi gazni suyuqlikka kiritishdir, ya'ni, ko'pik generatori gazni suyuqlikka kiritish uchun ma'lum bir usuldan foydalanadi. Turli xil ko'pikli mashinalar gazni kiritishning turli usullariga ega. Umuman, gazni ko'pikli mashinaga kiritishning bir necha yo'li mavjud:
(1) Sekin-asta aylanadigan pichoqlar gazni kiritadi
Bu gazni ohak ichiga to'g'ridan-to'g'ri kiritish usuli (yoki beton eritmasi) tsement ko'pikli vosita bilan aralashtiriladi. Mikser pichog'i atalani itarib yuborganda, havo mikser pichoqlari bilan atala ichiga kiradi. Bunga qo'chimcha, ko'p miqdorda havo atala ag'darilganda atala ichiga o'raladi, havoning bir qismi esa tsement va agregat bilan atalaga keltiriladi. Uchtasining yig'indisi atala ichiga kiradigan havoning umumiy miqdoridir. Ular orasida, aralashtirish pichog'i bilan atala ichiga olib kiriladigan havo va loyni aylantiruvchi pichoq bilan o'ralgan havo asosiy korpusni egallaydi..
Havo atala ichiga kirgandan keyin, ko'pikli agent sirt faol moddasini o'z ichiga olgan suyuqlik havoni o'rab oladi, havo va suyuqlik orasidagi interfeysda ikki elektronli qatlamli suyuqlik plyonka hosil qiladi, va nihoyat, suyuqlikdagi havo ko'rinishidagi ataladagi pufakchalarni hosil qiladi.
Pichoqlarning sekin aylanish tezligi va shu tarzda kiritilgan kamroq gaz tufayli, hosil bo'lgan pufakchalar miqdori kichik, ko'pik effekti yaxshi emas, va samaradorligi past.
(2) Yuqori tezlikda aylanadigan pichoqlar gazni kiritadi
Bu yuqori tezlikda aylanadigan pichoqlarga tayanib, puflovchi vosita eritmasiga gazni kiritish usulidir.. Gazni kiritish asosan aylanadigan pichoqlar kuchiga bog'liq. Ushbu turdagi pichoqlar odatda yuqori tezlikda aylanishni talab qiladi, the speed should be> 700 rpm, odatda orasida 700 va 1400 rpm, and the peripheral speed of the impeller end should be> 20 m/s qoniqarli natijalarga erishish uchun. Muayyan yuqori tezlik pervaneni suyuqlikka ta'sir qilishi mumkin, havo bilan aloqa qilish, va havo kiriting. Tezlik juda past bo'lsa, pervanega suyuqlik ta'sir qilmaydi, va qon ketadigan havo miqdori juda kam bo'ladi. Tegishli tezlik suyuqlik aylanayotganda pervane ochiq bo'lganidan past bo'lishi kerak.
The basic principle of impeller bleed air is as follows:
When the impeller rotates at a high speed, it drives the cement foaming agent solution in the foaming cylinder to rotate, forming a rolling circulation and generating a large vortex. At this time, the gas-liquid two-phase particles located at the gas-liquid interface at the top of the blowing agent solution will accompany them down and descend to the bottom of the vortex in a rapid spiral shape, forming a turbulent flow zone at 2.5-5 cm of the impeller edge. In this area, the gas-liquid two-phase particles are subjected to the strong shear and impact of the impeller, and are dispersed into fine dispersions, which quickly realizes the gas-liquid mixing, makes the gas uniformly dispersed in the liquid, and realizes the gas Introduce. Its introduction efficiency is related to various technical factors such as the speed, the diameter of the impeller, the distance between the impeller and the foaming tube, and the shape of the impeller blades. It is not determined by a single speed. High-speed impellers have air-entraining effects, but the efficiency, ta'sir, and energy consumption are different.
(3) Use of pressure to introduce gas.
This is currently the most commonly used advanced air-entrained foaming method at home and abroad. Bu, shuningdek, havoni jalb qilishning ko'proq ilmiy usuli. It is the core of foam concrete high-pressure and medium-pressure foam generator technology.
Yuqorida aytib o'tilgan ikkita usul sekin va notekis, va qabariq diametri katta, ayniqsa, qabariq diametrini nazorat qilib bo'lmaydi. Bu to'liq ko'pikli mashinaning tasodifiyligiga bog'liq, va kichik qabariq diametri va bir xil ko'pikni kafolatlay olmaydi. Eng muhim texnik ko'rsatkichlar. Xuddi o'sha payt, ko'piklanish miqdorini nazorat qilish qiyin.
Yuqoridagi muammolarni samarali hal qilish uchun, bosimli ko'piklash usuli paydo bo'ldi. Regardless of foaming volume, ko'piklanish tezligi, or foam diameter and foam uniformity, va hokazo., ular yangi bosqichga chiqdi va katta texnologik taraqqiyotga erishdi. Uning asosiy printsipi ikki fazani bir xil aralashtirishga erishish uchun havoni suyuqlik fazasiga bosish uchun havo bosimini yaratadigan turli xil uskunalardan foydalanishdir.. Oddiy bosim ostida, havoning suyuqlikka kirishi qiyin, lekin ma'lum bosim ostida, osonroq bo'ladi. Bu havo bosimi nafaqat gazni suyuqlikka bosadi, balki suyuqlikni gazga ham bosadi. Aslida, u bir vaqtning o'zida bosim o'tkazadi. Shu tarzda, shu ravishda, shunday qilib, ikki fazani aralashtirish tez bo'ladi, samarali, forma, va nozik pufakchalari bor, ko'pik uchun ideal texnik talablarga javob beradi.
There are two main types of pressure equipment used in our country, one is an air compressor and the other is a blower. The air compressor produces high pressure, and the blower produces medium low pressure. Shuning uchun, the foaming effect of the air compressor is better, and the foaming effect of the blower is slightly worse. Foaming with an air compressor is called a high-pressure foaming machine, and foaming with a blower is called a medium and low pressure foam generator. The foaming quality of the air compressor mainly controls its pressure and displacement, while the foaming of the blower mainly controls its wind pressure and air volume.
Due to the good foaming effect of air compression mechanism, most foaming machines in our country use air compressors. Blower foaming also has many applications in my country, but compared to high-pressure foaming, this foaming method is still rare. The foam produced by high-pressure air foaming has a low water-sucking rate, the bubble diameter is small, dense and uniform, and the quality is high. The foam produced by blast foaming has a slightly larger diameter, and the overall quality is not as good as high-pressure foaming.
(4) High pressure jet introduces gas
This is a foaming method that has been tried in recent years but has not been widely used. The basic principle is to use the strong dispersion force generated by the jet to achieve instantaneous large surface contact between the gas phase and the liquid phase, so that the two are uniformly mixed, and the liquid is entrapped to form a foam. This method does not show any more advantages than high-pressure air foaming, and it needs further exploration and improvement.
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