ISO 14694 nima?

Quick Answer

ISO 14694 (Sanoat ventilyatorlari — Balanslash sifati va tebranish darajalari bo'yicha texnik talablar) — bu maxsus moslashtirilgan standart ISO 1940 G-toifalari and ISO 10816 tebranish zonalari xususan sanoat ventilyatorlari uchun. U belgilaydi BV fan-application categories (BV-1 to BV-5). These categories are used for both balance-grade selection and vibration-limit selection. The standard default is BV-3 (G 6.3) balanslash uchun va specified limit (≤ 4.5 mm/s RMS) tebranishni qabul qilish mezonlari uchun.

Fans are the most common rotating machine in industry, yet they have unique characteristics — large-diameter impellers, significant aerodynamic forces, often cantilevered rotor arrangements, and highly variable operating environments — that justify a dedicated standard. ISO 14694 removes the ambiguity of interpreting general-purpose standards for fans by providing application-specific BV categories and vibration-limit tables that are directly usable in purchase specifications and acceptance testing.

Standart barcha turlarni qamrab oladi: statsionar, quruqlikdagi foydalanishga mo'ljallangan barcha o'lchamdagi markazdan qochma (radial), o'qli, aralash oqimli va ko'ndalang oqimli ventilyatorlar. Samolyotlar, havo yostig'idagi transport vositalari va shu kabi maxsus ilovalar bundan mustasno.

Ikki qismli tuzilma

ISO 14694 mantiqiy jihatdan ikki toifali tizimini aks ettiruvchi ikki to'ldiruvchi qismga bo'lingan:

  • 1-qism — BV (Muvozanat Sifati): Quyidagi uchun ruxsat etilgan qoldiq muvozanatsizlikni belgilaydi: faqat fan krylatkasi, yig'ishdan oldin. Quyidagida tekshiriladi: muvozanatlash mashinasi.
  • Part 2 — vibration acceptance (Vibration Limits): Quyidagi uchun maksimal ish tebranishini belgilaydi: to'liq yig'ilgan fan. Quyidagi standart bo'yicha ish paytida podshipnik korpuslarida o'lchash orqali tekshiriladi: ISO 10816 methodology.

Muvozanat Sifati Talablari (BV Toifalari)

BV toifalari alohida komponent sifatida fan krylatkasi uchun ruxsat etilgan maksimal qoldiq unbalance ni belgilaydi. Har bir BV toifasi bevosita ISO 1940-1 G-darajasiga mos keladi. Bu moslik ISO 14694 ning asosiy hissasi hisoblanadi: u fan uchun maxsus yo'riqnoma taqdim etish orqali to'g'ri G-darajasini tanlashdagi noaniqlikni bartaraf etadi.

Ruxsat Etilgan Qoldiq Muvozanatsizlik (ISO 14694 / ISO 1940)
Uper = (9 549 × G × m) / n
Uper in g·mm | G = BV grade value in mm/s | m = impeller mass in kg | n = max service speed in RPM

To'g'ri BV Toifasini Tanlash

  • BV-1 (G 16): Least demanding ISO 14694 category. Do not use it as shorthand for precision fans.
  • BV-2 (G 16): General/basic category with the same balance quality grade as BV-1, but a different application/vibration context.
  • BV-3 (G 6.3): Quyidagi uchun standart: vast majority sanoat fanlari — markazdan qochma va o'qli, HVAC ta'minot/qaytarish, jarayon ventilyatsiyasi. Agar shartnomada BV toifasi belgilanmagan bo'lsa, bu standart sukut bo'yicha qabul qilingan.
  • BV-4 (G 2.5): Higher-quality/critical fan category with stricter balance tolerance than BV-3.
  • BV-5 (G 1.0): Most stringent category for precision applications. This is the tightest balance tolerance in ISO 14694.
Ish tezligidan foydalaning, muvozanatlashtirish mashinasi tezligidan emas

Tolerantlik quyidagiga asosan hisoblanishi kerak: maksimal ish tezligi. Ko'plab pervazlar 300–600 RPM li sekin tezlikdagi mashinalarda muvozanatlantiriladi, ammo tolerantlikni hisoblashda haqiqiy ish tezligidan (masalan, 1 480 RPM) foydalanish shart. Muvozanatlashtirish mashinasi tezligida hisoblangan tolerantlik xavfli darajada bo'sh chiqadi.

Bir tekislikda va ikki tekislikda muvozanatlash

ISO 14694 ISO 21940-12 ko'rsatmalariga amal qiladi: tor pervazlar (eni/diametri L/D < 0,5, aksariyat markazdan qochma ventilyatorlarga xos) uchun single-plane muvozanatlash talab etiladi — to'liq Uper bir tekislikka tatbiq etiladi. Keng pervazlar yoki uzun o'qli ventilyator rotorlari (L/D ≥ 0,5) uchun ikki tekislikda dinamik balanslashtirish — Uper tekisliklar o'rtasida taqsimlanadi (simmetrik rotorlar uchun teng, assimetrik rotorlar uchun proporsional ravishda).

Operational Vibration Limits

vibration limits define the maximum allowable broadband RMS tebranish tezligi (mm/s) ni belgilaydi — o'lchov diapazoni 10–1 000 Hz ga muvofiq ISO 10816-1 methodology.

Qattiq va moslashuvchan poydevor

ISO 10816 singari, ISO 14694 ham tayanch konstruksiyasining o'lchanadigan vibrasiyaga hal qiluvchi ta'sir ko'rsatishini tan oladi:

  • Rigid: Ventilyator massiv beton yoki og'ir po'lat konstruksiyaga o'rnatilgan. Ventilyator-poydevor tizimining birinchi tabiiy chastotasi 1× RPM dan yuqori. Vibrasiya ko'rsatkichlari pastroq.
  • Flexible: Ventilyator prujina izolyatorlari, rezina yostiqchalar yoki yengil po'lat platformaga o'rnatilgan. Birinchi tabiiy chastota 1× RPM dan past. Vibrasiya ko'rsatkichlari yuqoriroq — ammo binoga uzatiladigan kuch pastroq.

Some specifications allow one BV vibration category higher for flexibly mounted fans (e.g., specified limit rigid → specified limit flexible for the same application).

BV Compliance ≠ vibration acceptance Compliance

Mukammal muvozanatlangan kryaufçilka (BV-3 talablariga javob beradigan) bajarmaydi not guarantee the assembled fan meets specified limit. Operational vibration depends on many factors beyond impeller balance: shaft misalignment, podshipnik holati, foundation resonance, aerodynamic forces (inlet distortion, damper position), belt tension, and coupling condition. BV is necessary but not sufficient for vibration acceptance.

Ventilyator tebranishining aerodinamik manbalari

Ko'pgina aylanma mashinalardan farqli o'laroq, ventilyatorlar havo oqimi bilan dinamik tarzda o'zaro ta'sir qilib, faqat ventilyatorlarga xos tebranish manbalarini hosil qiladi:

  • Qanot o'tish chastotasi (BPF): Every fan produces vibration at BPF = blades × RPM ÷ 60. Excessive BPF amplitude indicates clearance issues, inlet distortion, or guide-vane interaction.
  • Kirish oqimining buzilishi: Elbows, dampers, or obstructions close to the inlet create non-uniform flow → periodic blade loading → harmonics val aylanish tezligining.
  • Turg'unlik va surilish: Loyiha nuqtasidan uzoqda ishlash aerodinamik beqarorlikka — qanot turg'unligiga yoki tizim surilishiga olib keladi, keng chastotali tebranish va shovqin hosil qiladi.
  • Material buildup: In dust collectors and cement plants, uneven deposits on blades create progressive unbalance. A fan that met BV-3 at commissioning may exceed specified vibration limits within weeks.

Qabul sinovlari — ikki bosqichli tekshiruv

1-bosqich: Kryaufçilka muvozanatini tekshirish (BV)

Kryaufçilka kalibrlab sozlangan muvozanatlash mashinasida muvozanatlashtiriladi yig'ishdan oldin. Protsedura:

  1. Kryaufçilkani muvozanatlash mashinasining mandreliga yoki o'z podshipniklariga o'rnating
  2. Bir tekislikda yoki ikki tekislikda muvozanatlashni bajaring (L/D nisbatiga qarab)
  3. Qoldiq muvozanatsizlikni U dan past darajaga tushiringper belgilangan BV toifasi uchun
  4. Hujjat: boshlang'ich muvozanatsizlik, o'rnatilgan tuzatish massalari, yakuniy qoldiq muvozanatsizlik
  5. Qabul mezoni: yakuniy qoldiq ≤ Uper belgilangan BV uchun

Stage 2: Operational Vibration Test (vibration acceptance)

Yig'ish va o'rnatishdan so'ng ventilyator ish sharoitlarida sinovdan o'tkaziladi:

  1. Podshipnik korpuslariga tebranish sensorlarini o'rnating — har bir podshipnikda uchta o'zaro perpendikulyar yo'nalishda (V, H, A)
  2. Ventilyatorni loyiha tezligida va ish rejimida ishga tushiring; issiqlik barqarorligiga erishish uchun kuting (15–30 daqiqa)
  3. 10–1 000 Hz diapazonda kengguruhli RMS tezlikni (mm/s) qayd eting
  4. Qabul mezoni: the highest single reading from any bearing in any direction ≤ BV vibration category limit
Har doim to'liq spektrni qayd eting

Qabul qilish umumiy RMS asosida bo'lsada, har doim FFT spektri ishga tushirish davomida qayd eting. Agar ventilyatorda keyinchalik muammo paydo bo'lsa, asl spektr bilan taqqoslash diagnostika uchun juda muhim bo'ladi. Balanset-1A umumiy RMS va to'liq chastota spektrini avtomatik ravishda qayd etadi.

Ventilyator impellerlarini ob'ektda muvozanatlash

Many industrial fans must be balanced in-situ — either because the impeller is too large to remove, or because balance was lost during operation due to material buildup, erosion, or blade damage. ISO 14694 implicitly supports field balancing as the practical way to maintain BV and vibration acceptance compliance throughout the fan's operating life.

Ob'ektda muvozanatlash qachon kerak bo'ladi

  • Fan vibration exceeds specified vibration limit and FFT spectrum shows dominant 1× (unbalance) component
  • Material yig'ilishi ishga tushirishdan beri impeller muvozanatini o'zgartirgan
  • Qanot ta'miri, qanotni almashtirish yoki eroziyaga qarshi qoplamani almashtirish bajarilgan
  • Krыльчatka katta demontajsiz olib bo'lmaydi (qobiqli markazdan qochma shamollatgichlarda)
  • Ishlab chiqarish jadvali ustaxonada balansirovka qilish uchun uzoq to'xtashni ko'zda tutmaydi

Balanset-1A bilan ishlash tartibi

  1. Setup: Tebranish sensorini podshipnik korpusiga (radial yo'nalishda) o'rnating, lazerli taxometrni valga yo'naltiring. Bir tekislikdagi (F2) yoki ikki tekislikdagi (F3) rejimni tanlang.
  2. Initial run: Record baseline vibration — amplitude and phase at 1× shaft speed. Example: 8.2 mm/s at 135°.
  3. Trial weight: Ma'lum massali yukni (masalan, 20 g) mavjud parchaga yoki stupitsaga o'rnating. Qurilmani qayta ishga tushiring, yangi vektorni qayd eting. Misol: 210° da 5,5 mm/s.
  4. Correction: Dastur talab qilinadigan massani va burchakni hisoblaydi. Misol: "285° da 35 g qo'shing." Parraklarga o'rnatish uchun og'irlikni bo'lish imkoniyati mavjud.
  5. Verify: Final run confirms residual vibration below specified vibration limit. Typical result: 1.0–2.0 mm/s after one correction cycle.
Maydoniy sharoitda bir tekislikda va ikki tekislikda balansirovka

Ko'pchilik markazdan qochma shamollatgich parraklari single-plane balansirovka qilish uchun yetarli darajada tor (Balanset F2 rejimi). Keng parraklar, ko'p bosqichli shamollatgichlar va uzun aksial shamollatgichlar two-plane talab qiladi (ikkita sensor bilan Balanset F3). Tezkor sinov: ikkala podshipnikni o'lchang — amplitude yoki faza bo'yicha sezilarli farq bo'lsa, ikki tekislikdagi balansirovkadan foydalaning.

Amaliy holatlar — ISO 14694 amaliyotda

1-holat: HVAC ta'minot shamollatgichi — qabul sinovlari

Fan: Markazdan qochma HVAC ta'minot, 22 kVt, 1 460 RPM, parrak massasi 38 kg, qattiq beton asosida to'g'ridan-to'g'ri ulash.

Spec: BV-3 (G 6.3), specified limit (≤ 4.5 mm/s).

BV tolerance: Uper = 9 549 × 6.3 × 38 / 1 460 = 1 566 g·mm total → 783 g·mm per plane.

Balance check: Factory certificate: 420 g·mm residual — well within 1 566 g·mm limit. ✅

vibration acceptance test: Highest reading: 3.8 mm/s (horizontal, drive-end bearing). Within specified limit limit of 4.5 mm/s. ✅

Boshlang'ich spektr: 24,3 Gts da aniq 1×, 170 Gts da kichik BPF (7 parrak). Sog'lom shamollatgich.

2-holat: Changso'ruvchi shamollatgich — yig'ilishdan kelib chiquvchi progressiv disbalans

Fan: Radial parrakli changso'ruvchi, 30 kVt, 1 750 RPM, parrak 40 kg, qattiq asos.

Muammo: Vibration grew from 3.5 mm/s at commissioning to 9.8 mm/s after 6 months. specified BV-3 vibration limit → EXCEEDS.

Diagnosis: Balanset-1A FFT: dominant 1× peak at 29.2 Hz = shaft speed. Minimal 2× or other harmonics. Root cause: non-uniform dust buildup on blades.

Action: Qanotlar tozalandi, o'rnatilgan joyda balanslandi — Balanset-1A. Sinov og'irligi 15 g, hisoblangan tuzatish og'irligi 28 g, 195° burchakda. Balanslashdan so'ng: 1.3 mm/s. ✅

Recommendation: Material tashish ventilyatorlari uchun har chorakda tozalash va qayta balanslashni rejalashtiring.

3-holat: Tom egzoz ventilyatori — qanat o'tish rezonans muammosi

Fan: Markazdan qochma tom egzozi, 15 kW, 2 940 RPM, parvona 8 kg, yay izolyatorlari (egiluvchan).

Muammo: Umumiy tebranish 12,5 mm/s. O'rnatilgan joyda balanslash 1× komponentini 7,0 dan 1,5 mm/s ga tushirdi, ammo umumiy ko'rsatkich faqat 10,8 mm/s ga tushdi.

Diagnosis: FFT shows strong 7× peak at 343 Hz = 8.5 mm/s (BPF, 7 blades × 49 Hz). Fan housing tabiiy chastotasi ~340 Hz da — rezonans.

Root cause: 90° elbow immediately before inlet → non-uniform inlet velocity → BPF excitation → housing resonance amplification.

Solution: Kirish yo'naltiruvchi qanatlari o'rnatildi va tirsak yuqori oqimga ko'chirildi. Qanat o'tish chastotasi (BPF) 2,1 mm/s ga tushdi. Umumiy: 3.2 mm/s. ✅

This case illustrates why BV compliance alone does not guarantee vibration acceptance compliance — aerodynamic factors produce vibration independently of balance quality.

Boshqa Standartlar Bilan Munosabat

ISO 14694 alohida mavjud emas — u bir qancha xalqaro standartlarga murojaat qiladi va ularga tayanadi:

  • ISO 1940-1 / ISO 21940-11: BV toifalari murojaat qiladigan G-sinf tizimi. ISO 14694 har bir ventilyator turi uchun tegishli G-sinflarini tanlaydi.
  • ISO 10816-1 / ISO 20816-1: General vibration measurement methodology. vibration limits are derived from and compatible with ISO 10816 zones.
  • ISO 10816-3: 15–300 kW sanoat mashinalari. Bu diapazonidagi ventilyatorlar har ikkala standartdan foydalanishi mumkin, ammo ISO 14694 ventilyatorlar uchun yanada aniqroq ko'rsatmalar beradi.
  • ISO 5801: Fan performance testing. vibration acceptance tests reference operating conditions from this standard.
  • ISO 13347: Ventilyator akustikasi (shovqin). Bog'liq, ammo alohida soha — tebranishni kamaytirish ko'pincha shovqin tarqalishini ham kamaytiradi.
  • AMCA 204: Shimoliy Amerika ventilyator tebranish standarti. O'xshash qamrov; bittasiga javob beradigan ventilyatorlar odatda ikkinchisiga ham javob beradi.
ISO 14694 muvofiqligini ta'minlash uchun Vibromera uskunalari

The Balanset-1A ko'chma balansirovka qurilmasi quyidagilarni taqdim etadi: ikki kanalli tebranishni o'lchash (ikkala podshipnik bir vaqtda), o'rnatilgan ISO 1940 / ISO 14694 toʻsiq hisob-kitobi, bir tekislikda va ikki tekislikda muvozanatlash rejimlar, qanotlarga o'rnatilgan og'irliklar uchun tuzatish og'irliklarini bo'lish, FFT spektral tahlil for fault diagnostics, and vibrometer mode for vibration acceptance measurement. The Balanset-4 murakkab ko'p tayanch nuqtali ventilyator yig'malari uchun to'rt kanalgacha kengaytiradi.

Rasmiy standart: ISO Do'konida ISO 14694 →

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