High-pressured transducer spot comes loose hot plan introduces

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  • source:DALLMAN CNC Machining
Transducer of high pressure of town of Zhao of department of engineering of technology of electric technology limited company belongs to Beijing benefit De Huafu large electron equipment, stricter to environmental requirement. The moving circumstance of equipment of statistical much stage, because spot environment temperature passes tall and the equipment malfunction proportion that cause is larger, accordingly we summed up 3 kinds of come loosing that the spot often uses to heat up plan, offer user reference. The loss consideration that controls transducer and the temperature to the environment ask: The system of high-pressured frequency control that electric technology limited company produces Beijing benefit De Huafu is main by the following 3 parts composition: Control ark, power ark, transformer ark. Graph this system uses outline drawing of system of frequency control of 1 high pressure many centrifugal fan undertakes coming loose heating up, it is with 630kW/6kV transducer exemple, power ark top is 2, transformer ark top is 1 commonly, fan chooses the centrifugal fan that German EBM company produces, this fan reliability is high, performance is superior. Fan differs according to transducer power social estate, choose single-phase or three-phase fan. Among them single-phase fan nominal air delivery is 2500m3/h, three-phase fan nominal air delivery is 3300m3/h. Transducer discharges wind force always to discharge wind force to multiply for individual fan with fan amount. When transducer full load works, its total loss (change is quantity of heat) 3% what be systematic rated power about, when for instance 1000kW transducer full load works, loss is 30kW about. If so big quantity of heat is discharged entirely those who install transducer is indoor, will make indoor temperature lifts quickly, what affect transducer badly is normal move. Be stabilized to make transducer can long-term and move reliably, to the installation of transducer the environment makes following demands: Lowermost environment temperature - 5 ℃ , highest environment temperature 40 ℃ , the temperature change of working environment should not be more than 5 ℃ / H. If environmental temperature allows a value more than, lv of take an examination deploys corresponding come loosing to heat up equipment. 1. Medicinal powder the different environment that heats up plan to be aimed at the spot, we have 3 kinds to come loose hot plan: Add outfit air conditioning, add outfit air channel or install water air cold device. 1. Add outfit air conditioning 1.

When 1 transducer installs air conditioning, requirement transducer controls room airspace as far as possible small, and had been done sealed. 1.

Capacity of 2 air conditioning decides a principle really: The capacity that according to the calorific quantity of transducer and control room environment practical area chooses air conditioning 1.

2.

The computational transducer of 1 refrigerating capacity is calorific choose according to operating conditions, consider certain abundant amount, 4% what the largest calorific amount is transducer rated power, if long-term running frequency under 40Hz, calorific quantity but according to transducer rated power 2% undertake estimation. The air conditioning capacity that according to the room place of alone space refrigeration needs space of practical area computation, general every square metre can be calculated according to 150 watt. The refrigerating capacity with total air conditioning should increase the refrigerating capacity that dimensional refrigeration needs for the calorific quantity of transducer. 1.

2.

The choice of 2 air conditioning is so called air conditioning " be equal to " several, point to the size of power input formerly, include electric machinery of compressor, fan to reach electronic-controlled the energy that wastes partly, the refrigerating capacity how many computation with outputting power. Generally speaking, the refrigerating capacity of an air conditioning is 2000 kilocalorie roughly, conversion should be multiplied into international unit with 1.

162, 1 refrigerating capacity should be reason 2000 kilocalorie × 1.

162=2324(W) , the W(here is made of baked clay) represent refrigerating capacity namely, criterion 1.

5 should be 2000 kilocalorie × 1.

5 × 1.

162=3486(W) , with this analogize. According to this circumstance, can decide roughly a number of air conditioning and refrigerating capacity, usually, 2200W-2600W can call 1, 4500(W)-5100(W) can call 2, 3200W-3600W can be called 1.

5. 1.

3 air conditioning come loose hot actor defect: Advantage: Do not have as a result of air of room inside and outside direct and current, make sure indoor environment is clean easily. Defect: The dependability of air conditioning can affect the stability of transducer to move, air conditioning cost is high, moving cost is high. 2. Add outfit air channel 2.

The computational transducer of 1 ventilation discharges wind force always to discharge wind force to multiply for individual fan with fan amount. The discharge of single-phase fan is 2500m3/h, the discharge of three-phase fan is 3300m3/h. Of transducer room into wind, give wind force to need to match with this numerical value. 2.

The designs convention design of 2 air channel is to be above machine ark install air channel, the quantity of heat that produces transducer is discharged directly outdoor, complement ceaselessly by the air inlet of transducer room air cooling, undertake cooling to the system, the area need that shows air inlet undertakes deciding according to particular case of the system, and blast tuyere should install air screen pack, the mesh of screen pack must not be more than 5 × 5mm. Ventilation Qf of the system, assume the wind speed V of air inlet does not exceed 3m/s, by Qf=S × V knowable, the Qf/V of area S ≈ of air inlet. According to wind cold system medicinal powder hot principle, ρ of × of Cp of × of Qf of × of T of △ Q= △ , among them: △ Q: System T of total loss power △ : Air imports the difference in temperature with exit; Qf: Total ventilation Cp: Airy specific heat: 1005J/kg ℃ ρ : Airy density: 1.

165kg/m3 gives △ T according to above condition computation (the difference in temperature of air entrance and exit) . If transducer ark carries fan on the head to be apart from an a place with a draught closer (be less than 2 meters, the turn is not had among) , give blast tuyere to be able to be not added install auxiliary platoon fan. If the spot construction of air inlet is put in inconvenience, air channel needs to have a turn, can consider to add outfit fan to force to take wind. The specific construction of air channel can install perch hind in transducer, undertake in the spot. My company installation debugs personnel to be able to undertake guidance in the spot. Those who need an attention is transformer ark air channel and power ark air channel need departure, what will affect power unit otherwise is normal medicinal powder hot. 2.

3 air channel come loose hot actor defect: Advantage: Cost is low, reliability is high, medicinal powder hot result is favorable defect: Cannot use compare at the spot dirty, dirt compares big environment. 3. Water air is cold medicinal powder hot 3.

The sirocco that the working principle of system of refrigeration of 1 water air comes out from transducer, through wind the canal joins inside in the radiator that has fixed water-cooling canal, temperature is passed in radiator the cold water under 33 ℃ , after sirocco passes carbon fin, deliver quantity of heat cold water, become air cooling to be blown from carbon fin, quantity of heat is taken away by circular cooling water, the temperature that made sure transducer control is indoor is constant. Installation air is cold implement the requirement must be in airtight environment, to improve cooling result, the space that places device wants as far as possible small. Flow into air is cold implement water is circular water, to protect facility, ask the PH value of circular water is neuter, and without the impurity that corrodes attaint copper iron, those who drink water is hydraulic and general for 0.

2Mpa, 33 ℃ of ≤ of the temperature that drink water. Air is cold implement safeguard go easily simply, average half an year is safeguarded 1 times. 3.

2 install about transducer air is cold implement hind the partial requirement air to the spot is cold implement use hoisting means, be in so air is cold implement the housetop of hoisting upper part must steel of in the right way or channel serve as the bridge that prop up. Air is cold implement auxiliary equipment: Like flowmeter (can not add) , adjustable valve, filter had better keep apart installation with frequency conversion equipment. Install the simple and easy room of equipment to answer airtight, wall is comprised by insulation material. Air is cold implement technical condition is as follows: Take water temperature: 33 ℃ of ≤ , the job is hydraulic: 0.

2MPa discharge: ≥ 24.

5m3/h, nozzle internal diameter: 80 basises of Φ afore-mentioned conditions, but air of choose and buy is cold implement auxiliary equipment: Common water pump, flowmeter, adjustable valve, filter, conduit (without seam a canal) reach other parts of an apparatus. CNC Milling CNC Machining