CN2080416U - Multilayer film-scraping evaporator - Google Patents

Abstract

The utility model discloses relates to the improvement of a horizontal type scraping plate thin-film evaporator which is developed by LUWA company. The utility model is characterized in that more than a set of heating sleeves and more than two shafts of the scraping plates which are formed by concentric cylinders are arranged in a horizontal type outer cylinder, more than two scraping plates are arranged on each shaft of the scraping plate. A multilayer film-scraping evaporator has the features of small equipment, big evaporation capacity, good magnifying performance, light weight of the equipment, low cost, less energy consumption, etc.

Description

Multilayer film-scraping evaporator

The utility model belongs to the technological improvement of luwa evaporator.

Switzerland LUWA company has developed vertical and horizontal scraper plate book film evaporator before the utility model.The structure of this evaporimeter is to be provided with turning cylinder at a stationary cylinder center, and several scraper plates are installed on the axle.When axle rotated, these scraper plates rotated thereupon, and swiped at cylinder inner surface.Cylinder is welded with chuck outward, interior logical heat medium.Scraper plate spreads to the film shape to material when rotated, and material absorbs the heat of heat medium in the chuck, and then by steam raising, indirect steam is discharged by equipment one end; Raffinate (or concentrate) is discharged by the equipment other end.The heat transfer coefficient of this evaporimeter is very high, is handling high viscosity, and during the heat sensitive material that easily scabs, its shown excellent properties is all higher than existing any kind evaporimeter.

But the type evaporimeter has following several shortcoming: the first, and this evaporimeter has only one deck heat-transfer area, and the heat transfer area (S/V) that the FU volume is had is too little, and the equipment amplification performance is bad.Along with the increase of equipment heat transfer area, volume of equipment expands very serious.Second, maximization along with equipment, cylinder is subjected to the steam pressure effect in its chuck, its rigidity and intensity are become to be reduced greatly, rigidity and intensity in order to guarantee evaporimeter force wall thickness of cylinder to increase considerably, and this has just reduced heat transfer coefficient significantly, particularly when the material of evaporimeter is stainless steel, because of the influence that its poor heat conduction causes even more serious.Facts have proved, the heat transfer coefficient of large-scale scraper evaporator barely the evaporation pan heat transfer coefficient 1/2, this has just reduced the evaporability of equipment significantly.Three, along with the amplification of evaporimeter, flat evaporator steel that ability consumes will be multiplied, and make the evaporimeter overall weight increase rapidly.When equipment is when being made by materials such as stainless steels, equipment manufacturing cost is very expensive, more than is exactly the combined symptoms place that this type evaporimeter is difficult to maximize.

The purpose of this utility model is to provide a kind of and can keeps above-mentioned evaporimeter advantage, can overcome scraper formula thin film evaporator---the multilayer luwa evaporator of its shortcoming again.

The purpose of this utility model realizes by designing a kind of novel material heating system and scraping plates system.The material heating system is by being arranged on the outer chuck of horizontal outer cylinder and being arranged in the horizontal outer cylinder, and an above heating jacket of forming with these concentric two above cylinders (being heat transfer plate) constitutes, and wherein adjacent two concentric drums are formed a heating jacket.Scraping plates system is made up of main shaft, crosshead, two above scraper shafts and scraper plate.Main shaft is arranged on the center of horizontal outer cylinder, crosshead is fixed on the main shaft front portion, scraper shaft injects respectively between two heating jackets, its front end is fixed on (see figure 1) on the crosshead, be provided with two with upper scraping plate on main shaft and each scraper shaft, scraper plate relies on the elastic force of spring to be close to respectively on the inwall or outer wall of horizontal outer cylinder inwall and heating jacket.

During use, at first make heat medium by chuck and each heating jacket, make the heat transfer plate preheating, then starter motor (passing through sprocket wheel) drives main axis rotation, and main shaft drives crosshead and rotates, and crosshead drives the scraper shaft limit and rotates together with scraper plate.Meanwhile, controlledly add material in innermost layer cylinder (heat transfer plate) continuously, material is spread to thin glue under the scraper plate effect, and becomes the axle zigzag shape moving to the other end by heat transfer plate one end.In this process, material absorbs the heat from heat medium in the heating jacket, part is evaporated, the remaining material that is not evaporated flows on next layer cylinder heating surface naturally by centrifugal action, continue to be subjected to thermal evaporation, material flows in the outermost layer cylinder at last, after the heat continuation evaporation of absorption from heat medium in the chuck, obtains raffinate (concentrate) and flows out evaporimeter naturally by the raffinate outlet.Indirect steam is discharged through the curved tube of material steam outlet.

As desire to carry out intermittently operated, pending material once or in batches can be added in the evaporimeter.The addition of material is controlled at all can below 1/2 of horizontal outer cylinder 14 diameters of evaporimeter.After evaporation operation finishes.Gained raffinate (concentrate) is once discharged by evaporimeter raffinate mouth.Intermittently operated is fit to produce in enormous quantities.

One of difference of the utility model and common LUWA evaporimeter, be in a horizontal outer cylinder, to be provided with an above heating jacket, make the heat transfer area of evaporimeter and volumetric ratio improve several times, the also corresponding raising several times of production capacity, though equipment is little, production capacity is very big.More much smaller because of the average diameter and the length of multistage concentric tube among the design again than the LUWA evaporimeter of same heat transfer area.And every group of concentric drums one of them be subjected in the pressure effect, another is subjected to the external pressure effect, this is compared by the external pressure effect only with the heat transfer area of LUWA evaporimeter.The utility model evaporimeter can select for use thin steel plate to manufacture, and it is over half that weight of equipment is alleviated, and reduced the device fabrication cost, and improved heat transfer coefficient and evaporability.The utility model evaporimeter heating jacket is generally little by 2/3 than LUWA evaporimeter, and this has not only reduced weight of equipment, and has reduced the heat loss that heat radiation causes.In a word, the utility model evaporimeter is compared with common LUWA evaporimeter, has that equipment is little, evaporability is big, amplification performance is good, weight of equipment is light, cost is low, wearing and tearing are little and series of advantages such as economize on electricity.

The utility model evaporimeter is suitable for higher boiling (B.P500 ℃), high viscosity (10000CP), high solids, the vacuum distillation of the heat sensitive material that scabs easily and concentrated.As: intermediate and finished product in vitamin A, vitamin E, cod-liver oil, aliphatic acid, grease, mineral wet goods petrochemical industry, pharmacy, the perfume industry.

Fig. 1 is a kind of example structure generalized section of multilayer luwa evaporator, and Fig. 2 is the A-A profile of this evaporimeter, and Fig. 3 is the blade structure schematic diagram, and Fig. 4 is a scraper plate B-B profile.The utility model is described in further detail for following structure accompanying drawing.

The utility model comprises housing parts, heating system part and scraping plates system part.

Housing parts is made of dished (torispherical) head 4, horizontal outer cylinder 14 and end plate 10; The material heating system is seen Fig. 1 by chuck 9(), heating jacket 6,7(see Fig. 2), ring flat-plate 27,28 is formed; Scraping plates system is made up of main shaft 5,2,32 scraper plates 11 of 3,8 scraper shafts of support ring and crosshead 16.

Horizontal outer cylinder 14 front ends and dished (torispherical) head 4 rear end butt welding together, its rear end is by end plate 10 sealing.Have tap hole 1 in horizontal outer cylinder front portion, end plate 10 is provided with steam inlet 29,31 and condensation-water drain 30,32.The chuck 9 that has steam port 48 and condensation-water drain 15 of material heating system is welded on horizontal outer cylinder 14 outsides, and heating jacket 6 is by being made up of cylinder 23,24.Cylinder 23,24,25,26 and horizontal outer cylinder 7 constitute concentric drums.Heating jacket 6 front ends are welded with ring flat-plate 28, and heating jacket 7 front ends are welded with ring flat-plate 27, and heating jacket 6 and 7 rear end vertical welding are on end plate 10.The steam inlet 29, the condensation-water drain 30 that are arranged on the end plate 10 communicate with heating jacket 7; Steam inlet 31, condensation-water drain 32 (see figure 1) that communicates with heating jacket 6.Support ring 3 outer rims and horizontal outer cylinder 14 front inner wall are welded together, and support ring 3 and horizontal outer cylinder 14 are perpendicular.Support ring 3 centers are welded with bearing block 19, bearing 5 are housed in bearing block 19, and bearing 5 front ends are provided with gland 20, and gland 20 is fixed on bearing block 19 end faces by screw 21.In inside and outside both sides, end plate 10 centers, be welded with bearing block 34,35 respectively.Bearing 33 outer rims are adorned mutually with bearing block 34,35, and bearing block 34 also is equipped with bearing 36.Blind flange 37 is fixed on bearing block 34 end faces by screw 38.After main shaft 13 front ends pass crosshead 16 centre bores, insert bearing 5, and with bearing 5 interference fits.Crosshead 16 is fixed on the main shaft 13 by key 22, when main shaft 13 rotates, just drives crosshead 16 and rotates together like this.Bearing 33 is passed in main shaft 13 rear ends, and with bearing 33,36 interference fits.Crosshead 16 is provided with 8 scraper shaft 2(and sees Fig. 2), on main shaft 13 and each scraper shaft 2,4 scraper plates are installed all, per 2 is a pair of.Bind mode is: torsion spring 47, scrape panel seat 39, inside strake seat 40 centering on axis outward, inject scraper shaft 41 then, front end is equipped with baffle ring 42, is inserted in abutment sleeve 49 again, and baffle ring 43 is equipped with in the rear end, is locked with nut 44 again.Scraper plate fiber crops 39 upper notch places insert scraper plate 11 outside, and are fixed with screw rod 45 and nut 46; Insert scraper plate 11 in inside strake seat 40 indent equally, and fixed with screw rod 45 and nut 46, so promptly form the scraper plate mounted in pairs, other is equipped with identical therewith to the scraper plate mounting means.Scraper plate 11 relies on the elastic force of torsion spring 15 to be close on the surfaces externally and internally of horizontal outer cylinder 14 inwalls and heating jacket 6 or 7.In addition, sprocket wheel 12 is housed, connects by sprocket wheel and transmission mechanism in main shaft 13 rear ends.

Owing to the scraper plate fixed form of the utility model design, be to adopt " torsion spring folding " formula, therefore have elasticity automatically by wall, automatic adjusting function.Scraper plate 11 on the scraper shaft 2 can about, all around one moves, rotates and swing among a small circle.Rely on the elastic force effect of spring, each is close on the inwall or outer wall that leans against adjacent two cylinders at the volley all the time to scraper plate.This structure allows each layer cylinder that the certain ovality and the malalignment of fit on are arranged itself.

Claims (3)

1, the multilayer luwa evaporator, comprise sprocket wheel, housing parts, material heating system and scraping plates system, it is characterized in that said material heating system is by being welded in the outer chuck of envelope formula outer cylinder and being arranged in the horizontal outer cylinder, and constitute with 1 above heating jacket thing that the above cylinders of concentric 2 of this cylinder are formed, wherein adjacent 2 concentric drums are formed 1 heating jacket, heating jacket one end seals with ring flat-plate, the other end seals with end plate, each heating jacket respectively with end plate on corresponding steam inlet, condensation-water drain communicates, said scraping plates system is by main shaft, crosshead, 2 above scraper shafts and scraper plate are formed, main shaft is arranged on the center of horizontal outer cylinder, front-end of spindle is by the bearing fixing that is arranged on the support ring centre, support ring outer rim and horizontal outer cylinder front inner wall are welded together, rear-end of spindle is by the bearing fixing that is arranged on the end plate centre, crosshead is fixed on the main shaft front portion, scraper shaft injects respectively between 2 heating jackets, the scraper shaft front end is fixed on the crosshead, all is provided with 2 with upper scraping plate on main shaft and each scraper shaft.

2, multilayer luwa evaporator according to claim 1, scraper plate 11 and main shaft 13, the connection feature of scraper shaft 2 is torsion springs 47, scrape panel seat 39 outward, inside strake seat 40 centering on axis, inject scraper shaft 41 then, and by abutment sleeve 49, baffle ring 42,43 and nut 44 fixed, scrape panel seat 39 upper notch places outside, insert scraper plate, and fixed with screw rod 45 and nut 46, insert scraper plate in inside strake seat 40 indent, and fixed with screw rod 45 and nut 46, scraper plate on the scraper shaft can about, front and back, about one move among a small circle, rotate and swing.

3, according to claim 1,2 described multilayer luwa evaporators, it is characterized in that scraper plate is arranged in pairs on the scraper shaft.

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