A kind of filter screen two-level self-cleaning filter
The present invention relates to a kind of filter screen two-level self-cleaning filter.
In general filter, along with the carrying out of filter process, the solid phase particles in the liquid is trapped within filter element surface, causes that filtration resistance increases, and filter efficiency descends.At this moment generally need to interrupt filter operation, replacing filter element or taking-up are cleaned, and be not only time-consuming but also bothersome, affects treatment effeciency, especially affects the continuous running of whole flow process.
In some fields, such as power plant auxiliary machine cooling water, industrial circulating water, fire demand water etc., flow is large, and it is few to contain particle, all is solid, the crystal grain thing of some sandstone classes generally, removes easily.But because flow is large, flow process continues, and does not generally allow intermittently operated.Like this, along with the carrying out of flow process, although particle is few, can pile up gradually on the surface of strainer screen, form filter cake, cause filter net jam, filtration resistance increases, and filters obstructedly, affects normal flow.In this case, just require the filter screen of filter under non-stop-machine prerequisite, to carry out self-cleaning, guarantee the filter screen normal filtration, can self-cleaning regeneration.The such continuation of the whole flow process of guarantee.
At present, the Self-cleaning type filter plant mainly is the filter cake particle of the counter-flushing filter-net surface sediment under differential pressure action by mechanical removal or liquid, reaches the self-cleaning filter screen, the purpose that makes it to regenerate.Mechanical removal is as utilizing scraper plate, hairbrush, wire brush, non-metal plate etc.
There is following problem in the removing of these Self-cleaning type filter plants:
1, during mechanical removal, the particle of screen surface generally can obtain removing.But the particle between the filter screen twine can not go deep into can not get removing because of mechanical device.
2, after all fully ideal applying of mechanical cleaning device and screen surface, the not tight place of fitting will form particle packing to a certain degree, affects filter efficiency.
3, only utilize liquid counter-flushing filter-net under differential pressure action, can consume a large amount of cleaner liquids of crossing, increase energy consumption.Especially crossing cleaner liquid is expensive liquid, such as cutting fluid, will greatly increase cost.
Summary of the invention:
For overcoming the defective of prior art, the object of the present invention is to provide a kind of filter screen two-level self-cleaning filter, be applicable to power plant auxiliary machine cooling water, industrial circulating water, fire demand water, cleaning solution, cutting fluid and other similar flow is large, particle is few, the coarse filtration of easy filtering suspension liquid and smart filter.Have continuous filtration, the regeneration of secondary self-cleaning filter screen, compact conformation, the advantages such as smooth running is reliable, treating capacity is large, operating cost is low, long service life.
Technical solution problem of the present invention adopts following technical scheme:
A kind of filter screen two-level self-cleaning filter arranges cylindrical shell, and described cylinder body bottom is provided with the one-level sewage draining exit, and the cylindrical shell upper lateral part is provided with filtrate (liquid; The top of described cylindrical shell is by end cap seal, and is provided with exhaust outlet at end cap; In described inner barrel bottom sealing, the uncovered cartridge filter in upper end are set, described cartridge filter drives rotation by the power set that are fixedly arranged on the described end cap; Described inner barrel be positioned at described filtrate (liquid below be installed with minute spacer cylinder lumen be divided into up and down two cavitys, the inner periphery of described minute spacer seals with the excircle of described cartridge filter upper end and is connected rotationally; The sidewall of the cylindrical shell below minute spacer is provided with material inlet; The sidepiece that is positioned at cartridge filter in described cylindrical shell is provided with scraper base, be connected with the scraper of horizontal square frame shape at described scraper base, fit with the excircle of cartridge filter around one end of described scraper, be connected on the scraper base around the other end, the inner chamber of described scraper is communicated with the secondary sewage draining exit with the passage that the inner chamber of scraper base forms sealing; Described secondary sewage draining exit is located on the cylinder lateral wall of described one-level sewage draining exit top.
Design feature of the present invention also is:
In described cylindrical shell, set firmly sliding bearing, described sliding bearing is positioned on the axis of described cartridge filter and locates the cartridge filter below, be installed with the minor axis that inserts in the described sliding bearing in the bottom of cartridge filter, described sliding bearing forms the support of described cartridge filter and location.
Described power set comprise reducer pedestal, reductor and the motor that is fixed on the described end cap, the output shaft of described reductor is connected with major axis by shaft coupling and flat key, described major axis passes the inner chamber that described end cap extends to described cartridge filter, seals between major axis and the end cap; The upper end of described cartridge filter radially is provided with many ribs, and described major axis is on the axis of described cartridge filter and lower end and described rib connect firmly.
Described cylindrical shell is fastened by upper shell and lower shell and consists of, and the buckling parts of upper shell and lower shell is equipped with large flange, connects, and is provided with large gasket seal between two large flanges by bolt, nut between two large flanges.
Described scraper base comprise the square floor that is installed on the described cylindrical shell, vertically be fixed on the semicanal of the cross section semicircular in shape on the described base plate, vertically be fixed on square shrouding on the base plate, top at described semicanal vertically is fixedly connected with the semicircle shrouding, between the top of the front end of described semicircle shrouding and described square shrouding, be fixedly connected with the mount pad of frame type, boring around the described mount pad is socketed on the described mount pad and by screw around one end of the scraper of described horizontal square frame shape and fixes.
The middle part of described semicanal is installed with adjusting bolt, inwall correspondence position at lower shell is provided with the adjusting nut that cooperates with described adjusting bolt, be provided with waist type bolt hole on the described square floor, described adjusting bolt, adjusting nut and waist type bolt hole are regulated the radial displacement of holder in cylindrical shell, namely regulate around the end of described scraper and the applying tightness between the outer circle wall of cartridge filter.
Described cartridge filter is trapezoidal twine welding by many cross sections and forms tubular structure, has the filtration slit of wedge shape between the adjacent twine, and the filtration slit small end of described wedge shape is towards the inner chamber of cartridge filter, and large end outwardly.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The pluses and minuses of the present invention's recoiling device under differential pressure action in conjunction with mechanical cleaning device and liquid, make it to remove most of screen surface particle, can utilize again and cross on a small quantity cleaner liquid, particle and the inner residual particle of filter screen do not removed fully by wing are recoiled totally, make filter screen holomorphosis.Adopt mechanical removal to add the recoil of liquid pressure reduction and remove the secondary self-stripping unit, and this secondary self-stripping unit is organically combined, form the hollow doctor blade device of a compact conformation.On the one hand, can solve the removing dead angle of mechanical cleaning device and the not next problem of taut band of fitting; On the other hand, reduce and only to rely on the liquid cleaner liquid of crossing that counter-flushing filter-net brings under differential pressure action and expend excessive problem.And the simplification overall structure, make compact conformation, also make its installation, manufacturing, operation and easy to maintenance.
The scraper that is connected with scraper base among the present invention is nonmetallic materials, generally selects polytetrafluoroethylene (PTFE) to make.One side plays the sealing function with cartridge filter, plays on the other hand the effect of striking off the screen surface particle.Scraper is horizontal square frame shape, fits tightly with cartridge filter around the one end, and both sides and cartridge filter are substantially contour, and both sides scraped particle all, so turning to of cartridge filter do not required.
Screen pack among the present invention is to be the tube structure that the welding of trapezoidal twine forms by the cross section, and filter area is large, and smooth outer surface is conducive to the removing of particle.The filtration slit that has wedge shape between the adjacent twine, the filtration slit small end of described wedge shape be towards the inner chamber of cartridge filter, and large end is conducive to the solid particle that filtrate will filter in the slit and recoils away outwardly.
Cartridge filter among the present invention is by the sliding bearing location and installation, does not adopt any rolling bearing, makes compact conformation, reasonable.
Description of drawings:
Fig. 1 is overall structure schematic diagram of the present invention; Fig. 2 is the enlarged drawing of scraper base of the present invention; Fig. 3 is the B-B cutaway view of Fig. 2; Fig. 4 is the C-C profile of Fig. 2; Fig. 5 is the A-A profile of Fig. 1; Fig. 6 is that the cartridge filter shown in Fig. 5 is in the schematic diagram under the use state.
Number in the figure: 1 cylindrical shell, 1-1 upper shell, 1-2 lower shell, the large flange of 1-3, the 1-4 adjusting nut, 2 cartridge filters, 3 end caps, 4 minutes spacers, 5 scraper bases, 51 base plates, 52 semicanals, 53 square shroudings, 54 semicircle shroudings, 55 mount pads, 56 adjusting bolts, 57 waist type bolts hole, 6 scrapers, 7 sliding bearings, 8 minor axises, 9 reducer pedestals, 10 reductors, 11 motors, 12 shaft couplings, 13 flat keys, 14 major axis, 15 ribs, 16 material inlets, 17 filtrate (liquids, 18 secondary sewage draining exits, 19 one-level sewage draining exits, 20 inlet pressure interfaces, 21 outlet pressure interfaces, 22 exhaust outlets.
Below pass through the specific embodiment, and the invention will be further described by reference to the accompanying drawings.
The specific embodiment:
Embodiment: shown in Figure 1, the filter of present embodiment, main body is the cylindrical shell 1 that the bottom is provided with one-level sewage draining exit 19, the cylindrical shell upper lateral part is provided with filtrate (liquid 17; The top of cylindrical shell 1 is sealed by end cap 3, and is provided with exhaust outlet 22 at end cap; In specifically arranging, cylindrical shell 1 is made of upper shell 1-1 and the cooperation of lower shell 1-2 seam, and the auxiliary section of upper shell and lower shell is equipped with large flange 1-3, connects, and is provided with large gasket seal between two large flanges by bolt, nut between two large flanges.Set firmly sliding bearing 7 in the cylindrical shell 1, sliding bearing is positioned on the axis of cartridge filter 2 and locates the cartridge filter below, is installed with the minor axis 8 that inserts in the described sliding bearing in the bottom of cartridge filter, support and location that sliding bearing 7 forms described cartridge filter 2.
The uncovered cartridge filter 2 in upper end of bottom sealing is set in cylindrical shell 1 inside, and cartridge filter 2 drives rotation by the power set that are fixedly arranged on the end cap 3; In specifically arranging, described power set comprise reducer pedestal 9, reductor 10 and the motor 11 that is fixed on the end cap 3, the output shaft of reductor is connected with major axis 14 by shaft coupling 12 and flat key 13, major axis 14 passes the inner chamber that end cap 3 extends to cartridge filter 2, adopts seal receptacle and packing_seal to seal between major axis and the end cap; In the upper end of cartridge filter along cartridge filter radially be provided with many ribs 15, major axis 14 is on the axis of cartridge filter and the center of lower end and each rib 15 connects firmly, and drives the cartridge filters rotation by major axis 14.
Shown in Figure 1, inner barrel be positioned at filtrate (liquid 17 below be installed with minute spacer 4 cylinder lumen be divided into up and down two cavitys, the inner periphery of minute spacer 4 and the excircle of cartridge filter 2 upper ends be with the sealing of O type circle, cartridge filter and divide between the spacer and can relatively rotate; The sidewall of the cylindrical shell 1 below minute spacer 4 is provided with material inlet 16, and liquid to be filtered enters thus.
Referring to Fig. 1,2, the sidepiece that is positioned at cartridge filter 2 in cylindrical shell 1 is provided with scraper base 5, be connected with the scraper 6 of horizontal square frame shape at described scraper base 5, fit with the excircle of cartridge filter around one end of scraper 6, be connected on the scraper base around the other end, the inner chamber of described scraper is communicated with secondary sewage draining exit 18 with the passage that the inner chamber of scraper base forms sealing; Described secondary sewage draining exit 18 is located on the cylinder lateral wall of described one-level sewage draining exit top.
Shown in Fig. 2-4, scraper base 5 comprise the square floor 51 that is installed in cylindrical shell 1 inner chamber, vertically be fixed on the semicanal 52 of the cross section semicircular in shape on the base plate 51, vertically be fixed on square shrouding 53 on the base plate, top at described semicanal 52 vertically is fixedly connected with semicircle shrouding 54, between the top of the front end of described semicircle shrouding 54 and described square shrouding 53, be fixedly connected with the mount pad 55 of frame type, be socketed on the described mount pad 55 and by screw around the auger shell pit around the described mount pad, an end of the scraper 6 of described horizontal square frame shape and fix.
In order to regulate gap between scraper 6 and the cartridge filter 2 tightness of namely fitting, be installed with adjusting bolt 56 at the middle part of semicanal 52, inwall correspondence position at lower shell 1-2 is provided with the adjusting nut 1-4 that cooperates with described adjusting bolt 56, be provided with waist type bolt hole 57 on the described square floor 51, described adjusting bolt 56, adjusting nut 1-3 and waist type bolt hole 57 are regulated the radial displacements of holder 5 cylindrical shell 1 in, and the end of namely regulating described scraper 6 all around and the applying tightness between the outer circle wall of cartridge filter 2.
In specifically arranging, shown in Figure 5, cartridge filter 2 is trapezoidal twine welding by many cross sections and forms tubular structure, the filtration slit that has wedge shape between the adjacent twine, namely angle is the wedge shaped filter cavity of α, its minimum of a value m is the filtering accuracy of this cartridge filter, the filtration slit small end of described wedge shape is towards the inner chamber of cartridge filter 2, the large end outwardly, the particle that is conducive to is therebetween recoiled out, is unlikely being stuck.
In the use, referring to Fig. 1,6, material inlet 16 is provided with inlet pressure interface 20, and filtrate (liquid 17 is provided with outlet pressure interface 21, connects respectively Pressure gauge or other pressure-detecting device, realizes the sampling of pressure samples differential pressure.Mixed liquor to be filtered is in material inlet 16 enters cylindrical shell 1, crossing under pressure cleaner liquid enters in the cartridge filter 2 and then leaches from filtrate (liquid 17, solid particle be filtered the cylinder 2 be blocked in outside, rotation along with cartridge filter 2, the particle that is attached to the cartridge filter outer wall is struck off to fall by scraper 6 and enters one-level sewage draining exit 19, the sealed cavity that the particle that part is not struck off enters between scraper 6 and the scraper base 5 enters secondary sewage draining exit 18 by pipeline, when inlet pressure increases, outlet pressure reduces or the pressure differential of inlet pressure and outlet pressure when reaching settings, illustrate on the cartridge filter 2 and formed filter cake, cause filter net jam, filtration resistance increases, filter obstructed, open first one-level sewage draining exit 19 this moment, discharge the turbid solution in the cylindrical shell 1, open secondary sewage draining exit 18 according to pressure changing again, the inner chamber mineralization pressure of the inner chamber of scraper base 5 and scraper 6 and cartridge filter 2 is poor, filtrate flushing-back filtering net in the cartridge filter is gone out the solid particle in surface and the filtration slit, reaches the effect of secondary self-cleaning.In the practical application, one-level sewage draining exit 19 is not got back to normal value yet such as the pressure differential pressure after opening and discharging turbid solution, then needs to open secondary sewage draining exit 18, to the screen surface cleaning that further recoils.