CN102553299A

CN102553299A - Surface condensation liquid filtering mechanism

Info

Publication number: CN102553299A
Application number: CN2012100228485A
Authority: CN
Inventors: 陶金龙; 周彩明; 霍惠青
Original assignee: CHANGSHU SHANGHAI FEIAO PRESSURE CONTAINER Co Ltd
Current assignee: CHANGSHU SHANGHAI FEIAO PRESSURE CONTAINER Co Ltd
Priority date: 2012-02-02
Filing date: 2012-02-02
Publication date: 2012-07-11

Abstract

The invention relates to a surface condensation liquid filtering mechanism, and belongs to the technical field of filters. The surface condensation liquid filtering mechanism comprises a cylinder, a group of first filter cores, a medium introduction tube, a medium extraction tube, a group of backwashing efficiency increasing chambers, and a backwashing device. The surface condensation liquid filtering mechanism is characterized in that the top of the cylinder is provided with an oil extraction tube; the upper part of the backwashing efficiency increasing chamber is provided with a backwater chamber. A medium backflow port is maintained between the edge area of the top plate of the backwater chamber and the inner wall of the cylinder. The backwater chamber is fixedly provided with a group of filter core fixing tubes. The upper cavity of the cylinder is provided with a group of second filter cores. The backwashing device comprises a motor, a reducer, a coupling, a connecting seat, a main shaft, a separation sleeve and a backwashing tube. The surface condensation liquid filtering mechanism of the present invention has the following advantages that: the cleaning effect of the original medium is ensured; the processing, the installation and the maintenance are convenient; the pressure loss is small, ie., the medium extraction resistance is small; the structure of the backwashing device is reasonable, and can form a control connection with the medium extraction tube through a one-way valve; the whole structure is simple, and the mechanism is easy to operate.

Description

Surface condensation liquid filter mechanism

Technical field

The invention belongs to the filter technology field, be specifically related to a kind of surface condensation liquid filter mechanism

Background technology

surface condensation liquid filter is widely used in industries such as oil preparation, biology,drug and chemical industry, power station and papermaking, is used for the oil of condensate is separated, and uses to obtain clean condensate and return into boiler and recycle.

Chinese invention patent application publication number CN101015754A discloses the technical scheme of filter; The technical contribution of this scheme is on the dividing plate of tube in the chamber of cylindrical shell, to be separated out one group of backwash synergy chamber independently separately; In the time will implementing backwash; The counter-flushing liquid of being introduced by the medium fairlead through the motion of back purge system and the one by one inlet from corresponding synergy chamber enters into the synergy chamber; The filter core of crossing corresponding to below, backwash synergy chamber is got effective washing; Above-mentioned filter to the principle of crossing filter core raising cleaning effect is: the counter-flushing liquid of sharing equally originally in the whole cylindrical shell epicoele is become concentrate on certain chamber, each chamber is cleaned one by one, for example when backwash synergy chamber is eight; Flow velocity in unit interval can increase by 8 times so, promptly in the identical unit interval, can strengthen 8 times flushing flow rate.

are still gone up the patent application technology and are had following defective: one of which; Only can be applicable to that the extremely slight even better than nothing former medium of greasy dirt filters to greasy dirt content; And for Boiler Steam after condensing condensate or claim that the filter effect of condensate liquid is often unsatisfactory because the content of the oil in this type of condensate liquid is higher usually.Although the patent application scheme is at the capable filter core of crossing that can in the cylindrical shell cavity of resorption, be provided with more than a group of having instructed of the 4th page of 8-11 of specification; But do not provide concrete structure enlightenment; For example when having the filter core excessively of two or more groups; Backwash synergy chamber also needs correspondingly to increase so, but is to be difficult to realize in the manufacture process of reality, and is unpractical; Its two, when normally moving, the link that the medium after being filtered is drawn from the medium fairlead is many, the pressure loss is big; The 6th page of capable description of eighth row to 23 of specification according to this application; After being filtered medium and being former water and getting into the cylindrical shell cavity of resorption, get into backwash synergy chamber after in the cylindrical shell cavity of resorption one group is crossed filter element filtering, get into the cylindrical shell epicoele by the opening (delivery port) of each backwash synergy chamber; Check valve on the spacer of back purge system gets in the spacer chamber then; Therefore just drawn by the medium fairlead that joins with the spacer chamber and communicate at last, it is many to filter link, and the pressure loss is big; They are three years old; The structure relative complex; Check valve be located at individually on the spacer and not with medium fairlead generation direct relation; That is to say that check valve and medium fairlead are connected on the spacer separately single-rowly, only the medium after check valve will filter is just drawn by the medium fairlead after introducing spacer, thereby the medium fairlead is increased because of flex point causes processing more, installation difficulty improves and leak probability.

In view of above-mentioned prior art, be necessary rationally to improve, for this reason, the applicant has done useful design, and the technical scheme that will introduce below produces under this background

Summary of the invention

task of the present invention is to provide a kind of helping that the greasy dirt in the former medium is separated, helps the surface condensation liquid filter mechanism that reduces the pressure loss and be of value to remarkable simplified structure.

task of the present invention is accomplished like this; A kind of surface condensation liquid filter mechanism; It comprises a cylindrical shell; The tube of this cylindrical shell is provided with a chamber dividing plate that is used for the tube chamber is divided into cylindrical shell epicoele and cylindrical shell cavity of resorption in the chamber, on the dividing plate of tube chamber, is distributed with to be used for the upper and lower chamber of the cylindrical shell through hole of conducting each other; Cross filter core for one group first, be located in the cylindrical shell cavity of resorption, fix with the position of said through hole and communicate with through hole; One be fixed on cylindrical shell bottom communicate with the cylindrical shell cavity of resorption be used for cross filter core to said first and provide the medium inlet tube and of former medium to be fixed on the cylindrical shell top and the medium fairlead that the medium after will filtering is drawn that is used for be stretched over the cylindrical shell epicoele from the top of cylindrical shell; One group of backwash synergy chamber is formed in the top of described tube chamber dividing plate, and the opening of each backwash synergy chamber is corresponding to the central part of tube chamber dividing plate; One back purge system is fixed on the top of cylindrical shell, communicates with described backwash synergy chamber and communicates with described medium fairlead; Characteristics are: be provided with the greasy dirt fairlead that communicates with described cylindrical shell epicoele at the top of described cylindrical shell, the top of described backwash synergy chamber maintains a medium back flow mouth at a distance from being provided with a backwater room between the fringe region of the top board of this backwater room and the inwall of described cylindrical shell; This medium back flow mouth communicates with the cylindrical shell epicoele, and in backwater room, is installed with one group of filter core stationary pipes, and the upper end of each filter core stationary pipes is stuck in top board; The lower end extend into to be fixed with the base plate of backwater room in the backwater room and communicates with backwash synergy chamber, is provided with one group second in the described cylindrical shell epicoele and crosses filter core, and each second crosses filter core and described one group of filter core stationary pipes fixes; And communicate with the tube chamber of filter core stationary pipes, the irrigating gate of described medium fairlead communicates with described backwater room, and described back purge system comprises motor, reductor, shaft coupling, Connection Block, main shaft, spacer and recoil tube; Motor and reductor connect, and subtract the band machine and are fixed on the Connection Block, and Connection Block is fixed on the top of cylindrical shell; On Connection Block, also be provided with the one stroke switch; The upper end of main shaft extends the outer and shaft coupling connection of cylindrical shell, and the power output shaft of shaft coupling and reductor connects, and on shaft coupling, is installed with the one division dish; On the rim of index dial with the equidistant contact of matching that is useful on spaced apart with said travel switch; And the quantity of contact equates that with the quantity of described backwash synergy chamber the lower end of main shaft is arranged in the cylindrical shell epicoele and after passing through described backwater room, is arranged on a central authorities of chamber dividing plate rotationally, and spacer is arranged in the cylindrical shell epicoele; Fix with the inner top of cylindrical shell; On spacer, be provided with a check valve, an end of this check valve joins with said medium fairlead and communicates, and the other end communicates with the spacer chamber of spacer; Recoil tube is connected with main shaft; The upper end is stretched in the spacer chamber and with the spacer chamber and is communicated, and the lower end offers recoil and chews, and recoil is chewed with the opening of described backwash synergy chamber and matched.

The advantage of technical scheme that the present invention recommended is: owing to be provided with the greasy dirt fairlead at the top of cylindrical shell, thereby the greasy dirt that can will float on former dielectric surface draws, and guarantees the clean effect of former medium; Owing to be provided with backwater room on the top of backwash synergy chamber; And the irrigating gate of medium fairlead is communicated with backwater room, when therefore denying backwash, can will draw from backwater room through the medium behind first, second filter element filtering by irrigating gate in normal operation; And can the greasy dirt that float in the cylindrical shell epicoele not drawn; And the medium fairlead does not have flex point in cylindrical shell, not only give processing and install and safeguard all to have convenience, and the pressure loss is little, and to be that medium is drawn resistance little; Back purge system rational in infrastructure, and can pass through the check valve control connection between the medium fairlead; Overall structure more becomes simply than prior art, and it is convenient that operation more becomes.

Description of drawings

Fig. 1 is a concrete example structure figure of the present invention.

Fig. 2 is the cutaway view of Fig. 1.

Fig. 3 is the structure chart of the second mistake filter core of the present invention.

The specific embodiment

can be expressly understood technical spirit of the present invention and beneficial effect more for the auditor that the makes Patent Office especially public; The applicant general elaborates with the mode of embodiment below; But the description to embodiment all is not the restriction to the present invention program, any according to the present invention design done only for pro forma but not substantial equivalent transformation all should be regarded as technical scheme category of the present invention.

Fig. 1 and Fig. 2 are asked for an interview in , have provided a kind of concrete example structure of the surface condensation liquid filter that is suitable for condensate liquid (also claiming condensate) is filtered.In cylindrical shell 1 and partially the bottom in the tube chamber of cylindrical shell 1 is provided with a chamber dividing plate 13; By tube chamber dividing plate 13 with cylindrical shell 1 the tube chamber be divided into the upper and lower chamber 12,11 of cylindrical shell; On tube chamber dividing plate 13, offer one group of through hole 131; By through hole 131 the upper and lower chamber of cylindrical shell 12,11 is connected, the quantity of through hole 131 equates with the quantity of one group of first filter core 2 in being located at cylindrical shell cavity of resorption 11.Crossing filter core 2 for one group first all is located in the cylindrical shell cavity of resorption 11; Promptly respectively first cross the bottom of the lower support of filter core 2 at cylindrical shell cavity of resorption 11; And respectively first cross in the corresponding through hole 131 of upper support on tube chamber dividing plate 13 of filter core 2; Introduce in the cylindrical shell epicoele 12 by medium (condensate, the as follows) via through holes 131 after 2 filtrations of the first mistake filter core.

One group of backwash synergy chamber 5 has been built in on tube chamber dividing plate 13; The quantity that present embodiment shows one group of backwash synergy chamber 5 is eight, specifically is on tube chamber dividing plate 13, to be separated with identical spacing by eight pieces of demarcation strips 52, by the figure finding; The geometry of each backwash synergy chamber 5 is fan-shaped; Contract by export-oriented center is narrow gradually, the top of backwash synergy chamber 5 is sealed, by the base plate 82 of the following backwater room that will narrate 8 to its sealing.Whole backwater room 8 is formed in the cylindrical shell epicoele 12; The base plate 82 of backwater room 8 is fixed with aforesaid demarcation strip 52; Around the base plate 82 with the inwall solid welding of cylindrical shell 1; And constitute the top of the top board 81 of backwater room 8 corresponding to base plate 82, by Fig. 2 clearly illustrated top board 81 around and remain with the gap between the inwall of cylindrical shell 1, constitute medium back flow mouth 811 by this gap; When normal operation promptly was in the running status to media filtration, the medium in the cylindrical shell epicoele 12 only just was able to drawn by medium fairlead 4 behind the cavity volume that gets into (going back to) backwater room 8.On top board 81, be fixed with one group of filter core stationary pipes 812, the upper end of each filter core stationary pipes 812 is stuck in top board 81, and the lower end is docked on the base plate 82 and with backwash synergy chamber 5 and communicates.

are equipped with one group of second filter core 9 excessively in the cylindrical shell epicoele 12 of cylindrical shell 1, specifically be each second mistake filter core 9 is fixed with filter core stationary pipes 812.Be connected to medium inlet tube 3 in the bottom of cylindrical shell 1; As long as the valve on the pipeline of unlatching medium inlet tube 3 can be that the condensate that has explained the front is incorporated in the cylindrical shell cavity of resorption 11 with the medium that needs to filter just; Supply first to cross filter core 2 filtrations; Get into then in each chamber of one group of backwash synergy chamber 5; Draw and one group of second filter core 9 of being arranged in cylindrical shell epicoele 12 filters through filter core stationary pipes 812 again because backwater room 8 is through around the top board 81 or claim that the medium liquid return hole 811 of edge communicates with cylindrical shell epicoele 12, therefore through second the medium after filter core 9 filtrations return and cause backwater room 8.Because the irrigating gate 41 of medium fairlead 4 joins with top board 81 cylindrical shell 1 in and communicates with backwater room 8, so first, second medium of crossing behind filter core 2, the 9 enforcement double-filtrations of the process in the backwater room 8 is drawn the boiler of feeding use by medium fairlead 4 again.According to general knowledge, have the pressure of about 0.4-0.8MPa in the cylindrical shell 1, the greasy dirt that therefore floats on the dielectric surface in the cylindrical shell epicoele 12 can be drawn at the greasy dirt fairlead 7 at the top of cylindrical shell 1 through of the present invention continuing.On cylindrical shell 1 and at position, respectively be provided with access hole 15 and visor 14 corresponding to the upper and lower chamber 12,11 of cylindrical shell; Although only show in the drawings corresponding to access hole on the cylindrical shell epicoele 12 15 and visor 14, can not be interpreted as therefrom on the cylindrical shell 1 corresponding to cylindrical shell cavity of resorption 11 not have access hole 15 and visor 14.

significant advantage of the present invention is: because the irrigating gate 41 of medium fairlead 4 has been insinuated into backwater room 8, so can avoid effectively the medium that contains greasy dirt in the cylindrical shell epicoele 12 is drawn.And medium fairlead 4 inserts in cylindrical shell 1 with the mode of no flex point, therefore not only makes, easy for installation, also can reduce the resistance that medium flows out.

have provided back purge system 6 in Fig. 1 and Fig. 2; Motor 61 as the preferred back purge system of recommending 6 of the present invention cooperates with reductor 62 transmissions; Reductor 62 fixes through one group of bolt and Connection Block 64; Connection Block 64 is fixed through the top of one group of bolt and cylindrical shell 1 equally, and the travel switch 641 that is arranged on the Connection Block 64 is electrically connected (not shown) with the electric control box that is used to control surface condensation liquid filter mechanism of the present invention work.The upper end of main shaft 65 is stretched over cylindrical shell 1 outer promptly extending in the Connection Block 64 and is in transmission connection with shaft coupling 63; And the power output shaft of shaft coupling 63 and reductor 62 is in transmission connection; On shaft coupling 63, be equipped with one division dish 631, the number of the contact on the index dial 631 equates with the number of backwash synergy chamber 5.In the present embodiment, the quantity of backwash synergy chamber 5 is got 8, therefore; The number of the contact on the index dial 631 also is eight, distributes in index dial 631 equal intervals, and each contact all can act on travel switch 641 mutually; When travel switch 641 was touched in a certain contact, motor 61 stopped a period of time.Backwater room's 8 back centres that are arranged on (being bearing in) tube chamber dividing plate 13 through bearing block 651 (Fig. 2 signal) are rotationally being passed in the lower end of main shaft 65.Spacer 66 hangs admittedly in cylindrical shell epicoele 12, more particularly is fixed on the inner top of cylindrical shell 1, and the bottom is with seal cover 663 sealings.Recoil tube 67 is fixed with main shaft 65 and is rotated with main shaft 65; The upper end of recoil tube 67 is insinuated in the spacer chamber 662 of spacer 66; And offer liquid-through hole 672; 671 openings 51 corresponding to aforesaid backwash synergy chamber 5 are chewed in the recoil of the lower end of recoil tube 67, and more particularly, recoil is chewed liquid outlet 6711 on 671 corresponding to opening 51.In order to cause in the spacer 66 of back purge system 6, therefore between spacer 66 and medium fairlead 4, connected a check valve 661 by the counter-flushing liquid that medium fairlead 4 is introduced.

are asked for an interview Fig. 3 and are still combined Fig. 1, and preferred scheme is to be identical with the aforesaid structural design that first, second crosses filter core 9, but do not repel first cross filter core 2 with second excessively filter core 9 both adopt different structure.Following description is based on both same structures, because both are identical, so the applicant only elaborates to the second mistake filter core 9.

The critical piece of filter core 9 is crossed in as formation second filter unit skeleton cover 93 adopts made; Its shape is tubular; Filter the spaced apart medium fairlead 931 that is provided with on first skeleton cover 93, outside the first skeleton cover 93 of filter, filter courage 94 is being set, clearly illustrating to filter the shape of courage 94 among Fig. 3; Promptly constitute radial or claim that corrugated is centered around outside the first skeleton cover 93 of filter, will filter first skeleton cover 93 containings therebetween.As embodiment, adopt by the fibrage 941 of special modified fiber, and be preferably nylon in the both sides of fibrage 941 with material and process first, second protecting wire net 942,943 parcels as filter courage 94.Special modified fiber above-mentioned is preferred but not to adopt the trade mark by the producing and selling of Jining, Jining City, Chinese Shandong Province special fibre Materials Co., Ltd be the hydrophilic oleophobic fiber of 3C-II type with being limited to.Outside filter courage 94, be nested with filter courage sheath 95; Filter courage sheath 95 usefulness metal wire knitted form; Setting promptly coats oil loving filter disc 96 outside filter courage sheath 95, and the material of so-called oil loving filter disc 96 adopts nonwoven or felt or sponge, and it is nonwoven that present embodiment is selected nonwoven material.Outside filter disc 96, coat the outside fix cover of being processed by nylon 97, the positioning sleeve 97 outer ropes or materials similar such as iron wire of adopting are tied up as outside fix cover fastener 98 outside.The location covers 91 in the top configuration of the first skeleton cover 93 of filter, and the bottom configuration covers 92 in the location down, and the liquid-through hole 921 that following location is covered on 92 communicates with aforesaid filter core stationary pipes 812.The effect of set bolt 99 is to cross filter core 9 with whole second to be fixed on the filter core stationary pipes 812 shown in Fig. 1.

are after using a period of time; When needing replacing second to cross filter core 9; Cross filter core 9 with second and from cylindrical shell epicoele 12, take out (through access hole 12), remove outside fix cover fastener 98, remove outside fix cover 97, filter disc 96, filter courage sheath 95 and filter courage 94, will reactivate then promptly with the filter courage 94 and filter disc 96 replacings of market acquisition; Remaining part all can reuse, and therefore can practice thrift the use cost and the recycle value of giving full play to resource of applying unit.

applicant below combine Fig. 1 and Fig. 2 to set forth operation principle of the present invention, when normal operation, promptly get into condensate liquid or when claiming that condensate is filtered, back purge system 6 is in holding state, promptly is in the state of quitting work.Valve (inlet valve) on the pipeline of unlatching medium inlet tube 3; With medium to be filtered (is aforesaid condensate liquid; As follows) be incorporated into the cylindrical shell cavity of resorption 11 from medium inlet tube 3; Cross filter core 2 and filter for one group first in being located at cylindrical shell cavity of resorption 11; Medium after the filtration enters into each backwash synergy chamber 5 from through hole 131, causes be located in the cylindrical shell epicoele 12 one group second by filter core stationary pipes 812 and crosses filter core 9 and filters then, is crossed in the filter core 9 entering cylindrical shell epicoeles 12 from second by second medium crossed after filter core 9 filters.Because the backwater room 8 that sets up on the top of backwash synergy chamber 5 of the present invention communicates with cylindrical shell epicoele 12 through the medium back flow mouth 811 (also can claim the road, crack that refluxes) around the top board 81; Irrigating gate 41 owing to medium fairlead 4 communicates with backwater room 8 again; Therefore draw by medium fairlead 4; At this moment, the valve 42 (check valve) that is located on the medium fairlead 4 is in opening, and the flowing water Valve 43 that is located at the delivery port place of medium fairlead 4 also is in opening; But backwash water intaking valve 44 is in closed condition, crosses clean medium after filter core 2,9 filters and returns and cause boiler and use thereby will pass through first, second by medium fairlead 4.The greasy dirt that floats in the cylindrical shell epicoele 12 is then drawn by greasy dirt fairlead 7.In said process, on the spacer 66 of back purge system 6 and be in closed condition with medium fairlead 4 joining check valves 661.

The reason that are known like industry after the surface condensation liquid filter moves a period of time, when inlet outlet pressure differential reaches setting value, according to the signal of differential pressure transmitter, gets into backwashing procedures.Backwashing procedures has two kinds of control modes: the one, and automatic control; Promptly adopted programmable controller (PLC) control; During backwash according to the signal of pressure difference transmitter by PLC switching controls valve and starter motor 61, main shaft 65 contacts with travel switch 641 according to the contact on the index dial 631, aims at first backwash synergy chamber 5 rear motors 61 and stops a period of time (length of dwell time can be set as required); Carry out backwash; Reach starter motor 61 behind the setting-up time, one by one backwash is carried out in each backwash synergy chamber 5, the filter after the backwash is in subsequent use or gets into again and drops into.The 2nd, electric control box is installed in manual control on filter, switch valve and starter motor 61 when pressure reduction reaches setting value; Main shaft 65 stops a period of time (time is set as required) according to index dial 631 corresponding first backwash synergy chamber 5 rear motors 61; Carry out backwash, reach starter motor 61 behind the setting-up time, successively backwash is carried out (when aiming at each backwash synergy chamber 5 in each backwash synergy chamber 5; The starting of motor 61 and stop to accomplish by the automatic control circuit in the electric control box; Motor 61 need not to cut out flushing valve when rotating), after a circle has been accomplished backwash to all backwash synergy chambers 5, stop backwash automatically.

in backwash process, the valve opening of the backwash delivery port of (triplate line) on the pipeline of medium inlet tube 3, and the valve closing of medium intake; Flowing water Valve 43 on the pipeline of medium fairlead 4 is closed; Backwash water intaking valve 44 is opened; Counter-flushing liquid gets into medium fairlead 4 from backwash water intaking valve 44; Because valve 42 be check valve, so counter-flushing liquid can't get into backwater room 8 from medium fairlead 4, and can only be from the spacer chamber 662 of check valve 661 entering spacers 66; And then in liquid-through hole 672 entering recoil tubes 67; The liquid outlet of being chewed on 671 by the recoil of recoil tube 67 lower ends 6711 is injected in the backwash synergy chamber 5 from the opening 51 of backwash synergy chamber 5, the counter-flushing liquid that enters into backwash synergy chamber 5 from through hole 131 get into corresponding to 5 belows, backwash synergy chamber be that first of cylindrical shell cavity of resorption 11 is crossed filter core 2, cross filter core 2 cleanings corresponding to first of 5 belows, some backwash synergy chamber.After cleaning is accomplished; Motor 61 is worked again; Drive recoil tubes 67 by main shaft 65 and turn over a station, travel switch 641 contacts with another contact on the index dial 631, recoil this moment chew 671 be aligned in another backwash synergy chamber 5 again just opening 51; Carry counter-flushing liquid by liquid outlet 6711 to another backwash synergy chamber 5; To cross filter core 2 cleanings corresponding to first of another 5 belows, backwash synergy chamber, the rest may be inferred, until accomplishing filter core 2 backwashes crossed in first of all 5 belows, backwash synergy chamber.In backwash process, the check valve 661 that is located on the spacer 66 of back purge system 6 is in opening.

Cleaning action takes place because back purge system 6 is not crossed filter core 9 to second in the cylindrical shell epicoele 12 when backwash; Therefore the structure of the second mistake filter core 9 should adopt structure shown in Figure 3; Certain first crosses filter core 2 still can use structure shown in Figure 3, promptly uses and second crosses the similar structure of filter core 9

Claims

1. A kind of surface condensation liquid filter mechanism; It comprises a cylindrical shell (1); Be provided with the tube chamber dividing plate (13) that is used for the tube chamber is divided into cylindrical shell epicoele (11) and cylindrical shell cavity of resorption (12) in the tube chamber of this cylindrical shell (1), on tube chamber dividing plate (13), be distributed with the through hole (131) that is used for the upper and lower chamber of cylindrical shell (12,11) conducting each other; Cross filter core (2) for one group first, be located in the cylindrical shell cavity of resorption (11), fix with the position of said through hole (131) and communicate with through hole (131); One be fixed on cylindrical shell (1) bottom communicate with cylindrical shell cavity of resorption (11) be used for cross filter core (2) to said first and provide the medium inlet tube (3) and of former medium to be fixed on cylindrical shell (1) top and the medium fairlead (4) that the medium after will filtering is drawn that is used for be stretched over cylindrical shell epicoele (12) from the top of cylindrical shell (1); One group of backwash synergy chamber (5) is formed in the top of described tube chamber dividing plate (13), and the opening of each backwash synergy chamber (5) is corresponding to the central part of tube chamber dividing plate (13); One back purge system (6); Be fixed on the top of cylindrical shell (1), communicate with described backwash synergy chamber (5) and communicate, it is characterized in that: be provided with the greasy dirt fairlead (7) that communicates with described cylindrical shell epicoele (12) at the top of described cylindrical shell (1) with described medium fairlead (4); The top of described backwash synergy chamber (5) is at a distance from being provided with a backwater room (8); Maintain a medium back flow mouth (811) between the fringe region of the top board (81) of this backwater room (8) and the inwall of described cylindrical shell (1), this medium back flow mouth (811) communicates with cylindrical shell epicoele (12), and in backwater room (8), is installed with one group of filter core stationary pipes (812); The upper end of each filter core stationary pipes (812) is stuck in top board (81); The lower end extend in the backwater room (8) fixing with the base plate (82) of backwater room (8) and communicates with backwash synergy chamber (5), is provided with one group second in the described cylindrical shell epicoele (12) and crosses filter core (9), and each second is crossed filter core (9) and fix with described one group of filter core stationary pipes (812); And communicate with the tube chamber of filter core stationary pipes (812); The irrigating gate (41) of described medium fairlead (4) communicates with described backwater room (8), and described back purge system (6) comprises motor (61), reductor (62), shaft coupling (63), Connection Block (64), main shaft (65), spacer (66) and recoil tube (67), and motor (61) connects with reductor (62); Subtracting band machine (62) is fixed on the Connection Block (64); Connection Block (64) is fixed on the top of cylindrical shell (1), on Connection Block (64), also is provided with one stroke switch (641), and the upper end of main shaft (65) extends outer and shaft coupling (63) connection of cylindrical shell (1); Shaft coupling (63) connects with the power output shaft of reductor (62); On shaft coupling (63), be installed with one division dish (631), on the rim of index dial (631), be useful on the contact of matching, and the quantity of contact equate with the quantity of described backwash synergy chamber (5) with said travel switch (641) with equidistantly spaced apart; The lower end of main shaft (65) is arranged in cylindrical shell epicoele (12) and after passing through described backwater room (8), is arranged on a central authorities of chamber dividing plate (13) rotationally; Spacer (66) is arranged in cylindrical shell epicoele (12), fixes with the inner top of cylindrical shell (1), on spacer (66), is provided with a check valve (661); One end of this check valve (661) joins with said medium fairlead (4) and communicates; The other end communicates with the spacer chamber (662) of spacer (66), and recoil tube (67) is connected with main shaft (65), and the upper end is stretched in the spacer chamber (662) and with spacer chamber (662) and communicated; The lower end offers recoil and chews (671), and recoil is chewed (671) and matched with the opening (51) of described backwash synergy chamber (5)