High-pressure high-flow flue gas desulfurization centrifugal induced draught fan
Technical field
The present invention relates to the centrifugal induced draught fan field, is a kind of high-pressure high-flow flue gas desulfurization centrifugal induced draught fan.
Background technique
Along with the reconstruction of all kinds of coal fired boilers and the demand of enlarging in the enterprises such as domestic big section steel works, power plant, the trend development of the operating mode forward high pressure of the employed dedusting centrifugal induced draught fan of flue gas dust collecting system, big flow.At present, in most cases all be with the serial blower fan of double suction dual-support structure main separation object as this type of dedusting centrifugal induced draught fan.What this series blower fan adopted is the bigger wing blades of width-diameter ratio, and its strength stress is had relatively high expectations, when impeller diameter during greater than 2.8 meters; The rotating speed of blower fan can only be controlled at below 730 rev/mins; And what main shaft adopted is solid shaft, is equipped with the large cast steel reel and connects impeller, causes that rotatable parts weight is big, rotary inertia is big; Thereby blower fan must could accomplish cold start by supporting hydraulic couplers, and need join Lubricating-oil Station the sliding bearing of blower fan is carried out pressure lubrication.
For this reason, there is following present situation in the serial dedusting centrifugal induced draught fan of double suction dual-support structure: rotating speed is low, and impeller diameter is big, makes that fan starting moment is big, needs supporting fluid coupling variable speed to solve the cold start problem of blower fan; Rotatable parts weight is big, and the bearing capacity of bearing exceeds the service condition of selflubricating, must adopt Lubricating-oil Station to implement pressure lubrication.
Summary of the invention
The objective of the invention is to provide that a kind of cost is low, plane No. is little, be prone to start, the high-pressure high-flow flue gas desulfurization centrifugal induced draught fan of selflubricating.
Technological scheme of the present invention is: support sliding bearing, impeller, benefit plate, plain thrust bearing are sleeved on the main shaft successively from left to right; Reel is welded on the main shaft, and adopts bolt to be connected with impeller mid-game and benefit plate and fix; Left side disc and right disc place in support sliding bearing and the plain thrust bearing respectively and are sleeved on the main shaft; Support sliding bearing and rely on sphere and spring bearing casing to attach together, plain thrust bearing also relies on sphere and thrust bearing casing to attach together; Impeller is contained in the casing, and its two side entrance is set with slip ring, and slip ring is fixed on the casing biside plate.
One section empennage of airfoil vanes outlet end design along the circumferential direction is designed to laciniation in the impeller mid-game, and reel is designed to steel plate structure and is welded on the main shaft, and main shaft is designed to hollow-core construction.
Owing to adopted technique scheme, rotatable parts overall weight and rotary inertia are able to reduce significantly, and blower fan can only need motor directly to start and need not hydraulic couplers; Reduced the linear velocity of oil film; Increase the oil film area of contact of main shaft and bearing, improved bearing capacity, had little, the lightweight characteristics of plane No.; And adopt disc at box house from behavior bearing fuel feeding, thereby cancelled Lubricating-oil Station.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the partial enlarged drawing of Fig. 1.
Fig. 4 is the blade profile schematic representation.
Fig. 5 is a mid-game saw tooth structure schematic representation.
In the drawings: 1, casing; 2, reel; 3, main shaft; 4, spring bearing casing; 5, support sliding bearing; 6, left disc; 7, right disc; 8, plain thrust bearing; 9, thrust bearing casing; 10, slip ring; 11, bolt; 12, mend plate; 13, mid-game; 14, airfoil vanes; 15, impeller; 16, side plate; 17, empennage; 18, sphere; 19, sphere.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
In Fig. 1, a kind of high-pressure high-flow dedusting centrifugal induced draught fan, support sliding bearing 5, impeller 15, reel 2, benefit plate 12, plain thrust bearing 8 are sleeved on the main shaft 3 successively from left to right; Reel 2 is welded on the main shaft 3, and adopts bolts 11 to be connected with mid-game 13 and benefit plate 12 and fix; Left side disc 6 places in support sliding bearing 5 and the plain thrust bearing 8 respectively with right disc 7 and is sleeved on the main shaft 3; Support sliding bearing 5 and rely on sphere 18 and spring bearing casing 4 to attach together, plain thrust bearing 8 relies on sphere 19 and thrust bearing casing 9 to attach together; Impeller is contained in the casing 1, and its two side entrance is set with slip ring 10; Slip ring 10 is fixed on the casing biside plate 16.
The specific embodiment of the invention is: with one section empennage 17 of airfoil vanes 14 outlet end design, and the width-diameter ratio value of dwindling impeller; Along the circumferential direction be designed to laciniation in mid-game 13; Reel 2 is designed to steel plate structure and is welded on the main shaft 3; Main shaft 3 is designed to hollow-core construction; Sliding bearing is supported 5 be designed to the structure of big width-diameter ratio, adopt disc 6 and disc 7 from behavior bearing fuel feeding with plain thrust bearing 8.
The present invention is one section empennage of airfoil vanes outlet end design, in order to improving the pressure coefficient of impeller, and the width-diameter ratio value of dwindling impeller, strengthens the design speed (960rpm) of blower fan simultaneously, realized reducing the purpose of impeller diameter; Along the circumferential direction be designed to laciniation in impeller 15 mid-games; Reel 2 is designed to steel plate structure and is welded on the main shaft; Reduced the large-scale reel weight of Cast Steel, main shaft is designed to hollow-core construction, therefore; Rotatable parts overall weight and rotary inertia are able to reduce significantly, and blower fan can only need motor directly to start and need not hydraulic couplers; Sliding bearing is designed to the structure of big width-diameter ratio; Reduce the linear velocity of oil film, increased the oil film area of contact of main shaft and bearing, improved bearing capacity; Adopt simultaneously disc at box house from behavior bearing fuel feeding, thereby need not the Lubricating-oil Station pressure lubrication.