JPH035844B2 - - Google Patents

Description

Claim 1: An air cleaning device for removing particulates from air, comprising: (a) an unfiltered air inlet, a filtered air outlet, and a dust removal means remote from the unfiltered air inlet. , a housing adapted to allow air to flow from the unfiltered air inlet to the filtered air outlet and from the unfiltered air inlet to the dust removing means; (b) a filter disposed within the housing; an assembly, the filter assembly comprising: () a filter having an unfiltered side and a filtered side;
the filtered side is isolated from unfiltered air, the filtered side is in communication with the filtered air outlet, and () is located proximate to the unfiltered side of the filter and has an intermediate space therebetween; a louvered pre-cleaning mechanism forming a louvered pre-cleaning mechanism, the pre-cleaning mechanism including a continuous louvered partition plate, each of the louvers forming a passageway through the partition plate and into the intermediate space, the passageway approximately the louver is oriented in the direction of the air flow from the unfiltered air inlet to the dust removal means, and is adapted to separate particulates contained in the air flow by inertia; () the filtration side; reverse pulse ejection means disposed proximate to said reverse pulse ejection means, said reverse pulse ejection means being operated intermittently to provide a backflow of air through said filter to said unfiltered side so that particulates are dislodged from said filter; () closing means for closing each of the passages in response to the flow of backflow air; () outlet means provided in the intermediate space, the outlet means configured to cause the intermediate space to be free from dust; An air purifying device that communicates with means and constantly discharges the backflow air from the intermediate space so that particulates contained in the air flow are difficult to re-adhere to the unfiltered side. 2. An air purifier according to claim 1, wherein said closing means includes flap means attached to said partition plate adjacent to said intermediate space for closing said passageway in response to said backflow. Device. 3. An air cleaning device according to claim 2, wherein said flap means includes a flexible flap and said passageway is not obstructed when said flap is held in an unenergized state. 4. An air purifying device according to claim 2, wherein said flap means is curved to deflect said backflow toward said outlet means. 5. said flap is oriented such that said backflow is deflected in the same direction as the flow of unfiltered air entering said housing, and said outlet means is located downstream of said deflected backflow air. The air cleaning device according to claim 4. 6. The air purifying device according to claim 1, wherein the closing member includes a mechanical means for closing the louver of the partition plate and closing the passage. 7. The air purifier according to claim 6, wherein said mechanical means includes a pinion gear attached to each of said louvers, a rack gear, and means for moving said rack to open and close said louvers. Device. 8. The air cleaning system of claim 7, wherein said means for moving said rack includes an electromagnetic solenoid responsive to continued activation of said reverse pulse injection means. 9 The space on the filtration side is divided into a plurality of separate chambers by a dividing means, each separate chamber includes an independently operated backflow pulse injection means, and the plurality of pre-cleaning mechanisms with louvers are divided into a plurality of separate chambers. 3. The method of claim 1, further comprising independent louvered pre-cleaning mechanism sections oriented in alignment with each other, each pre-cleaning mechanism section including a closure means independently actuated in response to actuation of said reverse pulse injection means. The air cleaning device according to scope 1. 10. The air purifier according to claim 9, wherein the independent reverse pulse injection means are operated in a downwardly sequential order so that the particulates in the intermediate space move towards the lower part of the intermediate space. . 11 An air purifying device for removing particulates from the air, comprising: (a) an unfiltered air inlet, a filtered air outlet, and a dust removal means remote from the unfiltered air inlet; (b) a filter assembly disposed within the housing; and (b) a filter assembly disposed within the housing. , the filter assembly comprising: () a filter having an unfiltered side and a filtered side;
the filtered side is isolated from the unfiltered air, the filtered side is in communication with the filtered air outlet, () is positioned proximate the unfiltered side of the filter and has a plurality of passages; a partition forming an intermediate space between the filtered side and the filtered side; () a reverse pulse jetting means disposed adjacent to the filtered side, the reverse pulse jetting means being operated intermittently to pass through the filter to the unfiltered side; () occlusion means for occluding each of the passageways in response to the flow of backflow air, () providing backflow air exiting to the intermediate space so that particulates are dislodged from the filter and into the intermediate space; an outlet means provided at the air outlet means, the outlet means constantly discharging the backflow air from the intermediate space to the dust removing means, so that particulates contained in the air flow are difficult to re-adhere to the unfiltered side; Purification device. 12. An air cleaning device for removing particulates from the air, comprising: (a) an unfiltered air inlet, a filtered air outlet, and a dust removal means remote from the unfiltered air inlet; (b) a filter assembly disposed within the housing; and (b) a filter assembly disposed within the housing. , the filter assembly comprising: () a filter element having first and second halves, each half having an inner surface and an outer surface, the halves joined at one end; forming an interior space between said inner surfaces, said interior space being divided into a plurality of separate regions spaced apart at the other end; ,
said backwashing means provides intermittent pulses of air toward said region of said filter element to temporarily dislodge particulates from said outer surface; (d) said housing and said outer surface of said filter element half; a partition disposed between the partitions and forming an intermediate space between the partition and the outer surface, the partitions having a plurality of passages, and (e) a closing means for closing the passages when the backwashing means is activated. and (f) an outlet means provided in said intermediate space, said outlet means constantly discharging air from said intermediate space to said dust removal means, said dislodged particulates being discharged from said filter and pulsed. An air cleaning device that prevents re-adhesion to the filter after cleaning. 13. said pre-cleaning means comprises a plurality of reverse pulse ejection means directed to provide backflow air to each of said separate areas, said reverse pulse ejection means being capable of being independently actuated; 13. The air purifying device according to claim 12, further comprising means for driving the ejecting means successively from above to below, so that the particulates in the intermediate space move toward the bottom of the filter element. 14. An air cleaning device for removing particulates from air, comprising: (a) an unfiltered air inlet, a filtered air outlet, and a dust removal means remote from the unfiltered air inlet; (b) a filter assembly disposed within the housing; and (b) a filter assembly disposed within the housing. , the filter assembly comprising: () a generally V-shaped filter element having first and second halves, each half having an inner surface and an outer surface; are joined at one end to form an interior space between said inner surfaces divided into a plurality of separate regions and spaced apart at the other end; (c) backwashing means directed toward each of said regions; ,
said backwashing means provides intermittent pulses of air directed toward said region of said filter element to temporarily dislodge particulates from said outer surface; a pre-cleaning means for separating particulates from filtered air by inertia, the pre-cleaning means configured to partially change the direction of the unfiltered air to separate the particulates, the pre-cleaning means comprising: () a louvered partition disposed proximate to the outer surface of the filter element half and forming an intermediate space therebetween;
The partition has a plurality of louvers defining passageways, the louvers oriented such that the passageways are out of the flow of unfiltered air, so that unfiltered air flowing from the inlet to the dust removal means is redirected to (e) closing means for blocking said passageway when said backwashing means is activated; and (f) outlet means provided in said intermediate space. and said outlet means constantly exhausts a pulse of air from said intermediate space to said dust removal means to prevent said dislodged particulates from being expelled from said filter and re-attaching to said filter after a pulse. An air purifying device. 15. said pre-cleaning means comprises a plurality of reverse pulse ejection means directed to provide backflow air to each of said separate areas, said reverse pulse ejection means being capable of being independently actuated; 15. The air purifying device according to claim 14, further comprising means for driving the ejection means in a continuous order from above to below, so that the particulates in the intermediate space move toward the bottom of the filter element. TECHNICAL FIELD The present invention relates to the technical field of purifying air by removing particulates such as dust, and particularly to devices that are required to treat large amounts of air. BACKGROUND OF THE INVENTION Dust removal is accomplished by passing air through a filter made of a material that allows gases to pass through but not particulates, which collect on the filter and gradually clog its pores. This limits the air purification system, i.e. reduces the pressure passing through the filter and increases the load on the blower fan or blower. Therefore, in order to obtain an air purifying device with excellent performance, the area of the filter media must be increased in order to reduce the point at which restriction begins to occur to an acceptable level, and furthermore, the area of the filter medium must be increased to reduce the point at which restriction begins to occur to an acceptable level. Dust must be removed or replaced very frequently to prevent it from accumulating. Means have been devised to clean the filters without interrupting the operation of the system by means of mechanical vibrations or panel-like reverse jets of air. The latter cleaning process is successful in removing particulates from the filter media when the filter media is pleated paper, but in the grand scheme of things, normal airflow through the filter is restored at the end of each pulse and removes many particles. It draws particulates back into the filter, thereby reducing cleaning efficiency. This is particularly noticeable in systems where a large amount of air to be treated requires a large area for the filter medium. DISCLOSURE OF THE INVENTION One aspect of the present invention relates to an air cleaning device with an air panel jet cleaning mechanism, in which a filter medium is disposed, and particulates initially impinging on the filter pass through the filter during successive pulse cleanings. The gas flow is directed in such a way that it can be "transferred" along the medium and finally reach the dedusting position where it can be discharged from the air cleaning device, and the air cleaning action always takes place without interruption. Another aspect of the present invention relates to an air cleaning device having a pulsed air jet cleaning mechanism and an integral pre-cleaning mechanism. According to certain of these aspects, an air purification device for removing particulates from air is disclosed;
The apparatus includes a housing having an unfiltered air inlet and a filtered air outlet, a filter assembly within the housing, and a filter having an unfiltered side and a filtered side, the filtered side being the unfiltered side. an inertia-based pre-cleaning mechanism that is isolated from the unfiltered air, is located close to the unfiltered side, and forms an intermediate chamber therebetween; reverse pulse cleaning means for intermittently directing a backflow of air toward the filtered side of the filter so that particulates are detached from the unfiltered side and enter the intermediate space; Closing means for blocking a backflow passage through the pre-cleaning mechanism in response to the backflow; and outlet means for venting the backflow in said intermediate space so that particulates in the backflow re-deposit on the unfiltered side of the filter. The gist is that it consists of: According to another aspect of the invention, an embodiment is disclosed having the closure member described above without the multiple state and inertial pre-cleaning mechanisms associated with it. To be better understood in the following detailed explanation,
The foregoing disclosure has outlined rather broadly the more important features of the invention in order that its contribution to the industry may be better understood. The invention has, of course, other features, which are described in detail below and which are the subject matter of the appended claims. The concepts based on the present disclosure can be readily adopted as a basis for designing other arrangements that accomplish the objectives of the present invention. It is important, therefore, that the claims be regarded as including equivalent constructions that do not depart from the spirit and scope of the invention.

[Brief explanation of the drawing]

In the drawings, like reference numerals indicate similar elements throughout the several views. 1 is a partially cutaway plan view of an air purifying device according to the present invention; FIG. 2 is a generally vertical cross-sectional view taken along line 2-2 of FIG. 1; and FIG. 4 is a horizontal cross-sectional view along line 4--4 of FIG. 3; FIG. 5 is a somewhat schematic cross-sectional view of a second embodiment of the invention; FIG. 7 is a partially cutaway, cross-sectional plan view of an air purifying device according to the present invention; FIG. 8 is a generally perpendicular sectional view taken along line 8--8 of FIG. 7; 9 is an elevational view of the left side of FIG. 7, FIG. 10 is an enlarged partial sectional view of the filter assembly as shown by line 10--10 of FIG. 8, and FIG. 11 is an elevation view of the filter assembly shown in FIG. 12 is a sectional view taken along line 12-12 in FIG. 10, FIG. 13 is an enlarged view of the louvered structure in FIG. 10, and FIG. 14 is a cross-sectional view of FIG. FIG. 8 is a side view of another louvered structure of the filter assembly used; FIG. 15 is a plan view taken from line 15--15 in FIG. 14; FIG. 16 is a plan view taken from line 16--16 in FIG. 14. 17 is a schematic circuit diagram; FIG. 18 is a broken-away elevational view similar to FIG. 15 showing a further embodiment of the invention; and FIG. 19 is a schematic diagram according to the invention. FIG. 20 is a partial plan view similar to FIG. 7 showing yet another embodiment of the total air purifying device; FIG. 20 is an enlarged view similar to FIG. 13 showing yet another embodiment of the louvered structure; FIG. 22 is a sectional view similar to the portion of FIG. 10 showing an alternative configuration of FIGS. 19 and 20.

[Detailed description of the invention]

The embodiment of the invention shown in FIGS. 1 and 2 comprises an airtight housing 20 having a removable or hinged top 21;
A bottom 22, opposing sides 23 and 24, and opposing ends 25 and 2.
6 and a vertical partition 27 that partitions the housing into a large chamber 30 and a small chamber 31. The bottom 22 is shaped to form a dust removal chamber 32, to which a dust removal duct 33 is connected. An inlet 34 for the air to be scrubbed is provided in the top 21 near the closed end 25 and a draft opening 35
is provided in the top 21 so as to open into the large room 30 near the partition 27. A purified air outlet 36 is provided at the end 26. The partition 27 is provided with a plurality of holes 37, 38, 40,
An air flow path is formed extending from the inlet 34 through the large chamber 30, the holes 37, 38, 40, and the small chamber 31 to the outlet 36, as indicated by the arrows in FIG. multiple filter assemblies 41, 42,
43 is attached to the partition 27 so as to close the openings 37, 38, 40. For this attachment, the first ends of upper rod 180 and lower rod 181 are held in partition 27 between filters 41 and 42, and a similar pair of rods is held between filters 42 and 43. horizontal upper and lower channels 183
A support frame 182 consisting of legs 185 and 186 perpendicular to the legs 185 and 184 is rod-connected by a nut 187. A pressure pad 190 is disposed between the channel and the filter. For purposes described herein, a sheet metal deflector 191 is held by clips 192 so as to extend vertically between the rods. The filter assemblies are all similar, of which assembly 41 is shown in FIGS. 3 and 4, and is located at the edge of the frame 46 with an angled space 47 that narrows towards the closed first end 50. It consists of attached flat first and second filters 44 and 45. frame 4
The opposite end 51 of 6 is open and dimensioned to be seated in the opening in partition 27 and sealed with a suitable gasket 52. frame 46
The top 53 and bottom 54 of are closed, and
A pair of horizontal partitions 55, 56 provide strength and rigidity to the assembly and divide the angled space 47 between the filters into an upper chamber 60, an intermediate chamber 61, and a lower chamber 62. Each of the filters 44 and 45 has an inner and an outer sheet 64 of perforated metal or similar material.
The body 63 of pleated paper filter media is housed between 65 and 65, and the whole is held together by plastic or cement wire 66. The filter media pleats are oriented vertically as shown. Filter assemblies 41, 42 and 43 connect large chambers 30 to first and second chambers of irregular outline.
The division into parts is obvious, the first part being the space outside the filter assembly and the second part being the sum of the inclined spaces inside the filter assembly. Returning again to FIGS. 1 and 2, the chamber 31 is provided with a horizontal partition 70, and the space 71 below this partition serves as an air reservoir for cleaning the filter, with an air duct 72 for this purpose. Supplied via The same number of standpipes 73, 74 and 75 as the filter assembly are connected to the partition 7.
0, each standpipe supplies air from the chambers to as many valves as there are chambers in the inclined spaces 47 of the filter assembly. Therefore, the stand pipe 73 has an upper valve 76 and an intermediate valve 77.
and the lower valve 78 while supporting them. These valves are nozzles 80, 81 and 8.
chambers 60, 61 and 62 of the filter assembly 42 respectively coupled to 2 and having juxtaposed nozzles;
placed facing the center of the Standpipes 74 and 75 similarly have valves and nozzles, including valves 83 and 84 and nozzles 85 and 8.
6 is shown in FIG. Diffusers 90, 91 and 92 are mounted between the nozzle and partition 27 in alignment with standpipes 73, 74 and 75, respectively. Particulate matter is removed from the filter by partitioning the filter assembly into vertically arranged chambers, placing a plurality of nozzles in each chamber, and interposing a diffuser between the nozzles and the chambers. It turns out that the efficiency of the pulse jet is optimal,
This will be explained below. Preferably, the valves 76, 77, etc. are normally closed electromagnetic valves that are electrically driven to inject air in pulses from nozzles 80, 81, etc. that work together at short intervals. By means of a suitable switch circuit as shown in FIG. 6 and including a timer 93, the valves are arranged so that the jet is directed simultaneously into the top chamber of each filter assembly, then into the middle chamber, and then into the bottom chamber in repeated cycles. is energized: the length of the cycle and the length and spacing of the pulses within the cycle can be varied at the operator's discretion to maximize cleaning effectiveness, depending on the nature of the particulates to be removed. Operation For operation, the top 21 is opened and a plurality of clean filter assemblies 41, 42 and 4
3 is inserted and held airtight in the partition 27.
The top 21 is closed, an inlet duct for the air to be cleaned is connected at 34, an outlet duct for clean air is connected at 36, a negative pressure air source is connected to the duct 33, and a positive air source is connected to the duct 33. It is coupled to the duct 72. To operate the air cleaning device, electrical energy is applied to timer 93 and ventilation to the air cleaning device is initiated, typically by a pump or fan coupled to outlet 36. The dust particles carried by the air entering the air purifier at 34 first pass through the assembly 41,
It is collected on the outer surface of filters 42 and 43. The timer 93 operates and the standpipes 73, 74 and 75, the valve 83,
nozzles 85, 80 and 86 via 76 and 84;
The nozzle fires a jet of air past the diffusers 90, 91, and 92 into the upper chamber 60 of the filter assembly, impeding the flow of air inwardly from the filter. , which instantly blows away dust particles from the outer surface of the filter. The deflector 191 is provided to prevent particles thrown off from one filter from being blown away through the space between the filters and colliding with an adjacent filter. The particulates begin to fall under the force of gravity into the normal airflow below, but once the cleaning pulse ends, normal airflow is restored and the particulates are now lower and closer to the partition 27 than they were at the beginning. Touch the filter again. Then, pulsed air is sequentially supplied to the middle chamber and the lower chamber to again blow away dust particles. If a small amount of ambient air is introduced at the draft opening 35, the partition 27
The downward movement of nearby particles becomes even easier. Dust particles move across the surface of the filter,
Finally, it reaches the dust removal chamber 32, and from there the air inlet 3
4 and a small amount of air taken in through the draft opening 35 are discharged through the duct 33. In some embodiments of the invention, chamber 71 has a volume of 1 cubic foot and the cleaning air is supplied at 100 pounds per square inch, with 65
down to pounds per square inch. These numbers will of course vary depending on the size of the device:
In the above example, the inlet 34 had a capacity of 8000 feet/minute. Construction of Second Embodiment A second embodiment of the present invention is schematically shown in FIG.
and an upper small chamber 103.
0. The air to be cleaned is introduced into the housing at an inlet 104 near the bottom, and the cleaned air is removed from the air cleaning device at an outlet 105 at the top. A reservoir 106 supplies cleaning air by a duct 107 and is provided with standpipes, valves, nozzles and deflectors as described above. A filter assembly, shown at 110, is supported and sealed to the partition 101, which may be as shown in FIGS. 3 and 4. The housing 100 includes a vertical partition 113 to form a dust removal space 114 connected to a dust removal duct 115, and has a plurality of holes 116, 117,
120 and 121 are provided to provide communication between chamber 102 and space 114. Operation The operation of the second embodiment of the invention is similar to that described above. Dust particles that collect on the surface of the filter are instantly blown away by the cleaning air jet and moved across the surface of the filter. In this embodiment, the upward movement is provided by a normal flow of air into the housing, and the dust removal space 1
The negative pressure maintained within 14 causes movement to the left. Although the housing is not shown with a draft opening, the air cleaning device may be used in systems where air is forced into the inlet 104 rather than being drawn through the outlet 105. In both of the above embodiments, the substances removed by the dust removal duct are treated in the same manner as before. Another Embodiment Including an Integrated Pre-Cleaning Mechanism Another embodiment of the invention including an integrated pre-cleaning mechanism is shown in FIGS. 7-22. Several variant embodiments are shown in these figures and will now be described. The embodiment shown in FIGS. 7-13 consists of an airtight housing 220 having a hinge portion 222 for the admission of unfiltered air;
2 is pivotally supported by a hinge 224 and locking means 22
6 in the closed position. FIG. 7 shows left side wall 228 and right side wall 230, while FIG. 8 shows top wall 232 and bottom wall 234. A plurality of filter assemblies 240, 242, and 244 are disposed within the housing 220. The filter assembly is held within the housing by bolts 246 and plates 250, 252 at each end. Plate 252 has hole 25
4,256 and 258. Pulse jets 260 _ac , 262 _ac and 26 ac are placed near these holes.
4 _ac is placed. The relative orientation of this is best shown in FIG. Each pulse jet 260-
264 is designed to provide high velocity airflow for backwash pulses of the filter assembly.
This pulse jet is of the same nature as that indicated by symbols 73, 76 and 80 in the previous embodiment; however, the diffuser 90 used in the previous embodiment is optional. . The pulse jet is a conduit 26 that guides the air.
6,268 and 270. The hinge portion 222 has a plurality of partitions 278,2
It includes a plurality of passageways 272, 274 and 276 formed by 80, 282 and 284, which passageways are curved as shown in FIG. The passages are arranged to provide a flow of unfiltered air to the filter assembly as described below. I would like to turn the explanation to the individual filter assemblies for a moment and draw your attention to FIGS. 10 to 12. The basic components of filter assemblies 240-244 are similar to assembly 41 shown in FIGS. 3 and 4 of the previous embodiment. Changes in this range will not be explained, so please refer to the detailed description above. All filter assemblies are similar.
A filter assembly 240 is shown in FIGS. 10-12, which consists of first and second flat filters 286 and 288 (each having a filtering side 287a and an unfiltering side 287b);
These include a frame 290 having an inclined space 292 between them that narrows towards a first closed end 294.
attached to the edge of the The other end 296 is open and sized to seat in one of the openings 254-258 in plate 252, preferably with gasket seal 2.
98 to maintain an airtight connection. frame 2
The top 300 and bottom 302 of 90 are closed, thereby enclosing the "filtration" side of the filter assembly, and a pair of horizontal partitions 304 and 305 provide strength and rigidity to the assembly and define space 292. Upper chamber 292a, intermediate chamber 2
92b and a lower chamber 292c. Each of the filters 286 and 288 has inner and outer sheets 308 and 31 made of perforated metal or the like.
The filter media 306 is made of pleated paper filter media 306 that is housed between 0 and 30 cm. A pre-clean mechanism enclosure 312 surrounds the frame 290, which connects the frame 290 to the unfiltered side 286.
enclose along b. Surrounding 312 and frame 29
An intermediate space 314 is formed between 0 and 0. siege 31
2 is two louvered panels 316a and 316b
The panels are mirror images of each other and are joined by a second end panel 318.
The remainder of enclosure 312 is received by frame 290 at gasket 298. Louvered panels 316a and 316b are shown in more detail in FIG. 13 of the drawings. Panel 31
Since 6a and 316b are symmetrical, only one will be described in detail. Panel 316a includes a plurality of continuous louvers 319, which are molded from a flat sheet to obtain the overall shape of a raised portion 320 and side sloped portions 322 as shown more clearly in FIG. It is preferable to process by stamping. flat sheets 316a and 316b
The angle of inclination of the portion 320 relative to the wafer is predetermined according to manufacturing requirements to enhance the pre-cleaning effect depending on the particular gas concentration and pressure to which the device is to be applied. Each louver has an intermediate space 314 and a housing 22.
A passageway 324 is provided between the inner spaces 221 of 0. On the opposite side of enclosure 312, adjacent space 314, a flap 328 is secured by a stop 326. The flap is preferably made of a flexible material, such as rubber or plastic, so that the flap closes the passageway 324 from its closed position to the intermediate space 31.
4 to a position extending into the intermediate space, allowing the passageway to open in response to changes in air pressure in the intermediate space. When the flap 328 is in the closed position, the flap and each louver 320
are brought into contact with the end 330 of. As shown in FIG. 10, a dust removal outlet hole 332 is provided in the intermediate space 314 near the first end panel 318. Each filter 240-24
Holes 332 for 4 are grouped into a manifold 334 as shown in FIG. As an outlet for air in the inner space 221, a hole 336 is provided (as shown in FIG. 7) which is connected to a manifold 338, from which it is finally exhausted to the outside. OPERATION This embodiment of the invention provides an excellent means for double filtration of uncleaned air and backwash pulse cleaning of the filter element. The primary filtration of unpurified air is performed by inertial separation. Unpurified air flows through passages 272-276 (7th
and FIG. 8) and enters the inner space 221 of the housing 220. Arrows 400 within passageways 272-276 indicate the direction of air flow. Air within inner space 221 generally moves toward hole 336 . As the air passes through louvers 319, it will flip approximately 180 degrees to enter passageway 324, as shown by arrow 402 in FIGS. 7 and 13. Because particles have a greater mass than air, when they try to enter the louver, there is a large inertia that prevents the particles from turning over, causing most of the heavier particles to separate and move along a straight line. The water continues to flow into the hole 336. Therefore, the air entering passageway 324 will be pre-cleaned. Air then enters intermediate space 314 in the direction indicated by arrow 404 in FIG. Filter media 306 removes most of the remaining particulates and allows air to pass through the filter in the direction indicated by arrow 406 in FIG. 13. Clean air finally comes from hole 25
4-258 in the direction indicated by arrow 408 in FIG. Filter media 286 becomes clogged with particulates and must be cleaned with counter-pulses of air from pulse jets 260-264. Air backflow is indicated by arrow 410 in FIGS. 10 and 13. During the period when the counter-pulse of air is applied, particulates are blown away from the surface of the filter medium 306 and into the intermediate space 314 . This counterpressure immediately urges flap 328 against end 330, thereby closing passageway 324 (FIG. 13). The only passage left for backflow air is hole 3.
32 and manifold 334. This effectively blows the particulate-laden cleaning air out of the system to prevent the bulk of the particulates from being redeposited onto the filter media. Flap 328 is flexible and preferably slightly bent to tend to deflect backflow toward hole 332 as indicated by arrow 412. moreover,
Its flexibility allows the flap to form a greater bend during closure of passageway 324. To provide continuous operation of the filter, it is not possible to apply reverse pulse cleaning to all parts of the filter at the same time. By partially successive sections of each filter assembly to be cleaned, it is possible to cause the particles to be transported as a whole in the direction indicated by arrow 414 in FIG. Using this transport effect, the filter assembly siphons away any accumulated particles through the holes 332 (see FIGS. 8 to 10) at the bottom of the intermediate space 314 and directs the particles to the arrows. Wiping through manifold 334 as shown at 344 provides a self-cleaning mechanism. Alternative Embodiments The embodiment disclosed in FIGS. 19-21 appears to be the best mode at this time. Many of the features of this embodiment are the same as the embodiments described above and will not be repeated. The changes in this embodiment from the previous embodiment are shown in FIGS. 19 to 21. To simplify the airflow in the intermediate chamber 314a shown in FIG.
(See Figure 3 and comparison). In FIG. 20, each flap 328a is secured to the next guide louver 319a so that the curl of the flap is reversed. As previously discussed, it is this bend or curl that helps direct the reverse pulsed flow of air in the specific direction indicated by arrow 412a during and after passageway 324a is closed. As shown in FIG. 20, the flow of uncleaned air outside the louver, indicated by arrow 414, and the air flow of the counterflow pulse, indicated by arrow 412a, are generally in the same direction. This makes it possible to simplify the dust removal system for the intermediate space 314a. As shown in FIG. 22, the termination of plate 312a near gasket 298a has been changed from the previous embodiment shown in FIG. In this example, the 22nd
In the figure, the hole 4 at the end of the intermediate space 314a
16 provides an outlet passageway (FIG. 21) for this flow of air collected in manifold 338a. The direction of airflow is indicated by arrow 422 in FIG. It should be noted that manifold 338 is the same manifold that collects the heavy particulates initially separated in space 221 during the first phase of the preclean. Manifold 3
38a substantially corresponds to manifold 338 in the previously described embodiment shown in FIG. Thus, by reversing the direction of airflow within intermediate chamber 314a as shown by arrow 412a as a result of reorienting flap 328a, holes 332 and manifold 334 as employed in the previous embodiments are reversed. It is possible to delete. In this embodiment, manifold 338 is used to collect dedusting air during backflow pulse jet cleaning. Alternative Embodiment with Adjustable Louvers This embodiment of the invention includes many of the features and elements shown in the previous two embodiments, and features and elements within these ranges are not repeated. , I would like you to think that they are roughly the same. In this embodiment, the inclination angle of the louver can be adjusted mechanically by mechanical or electromechanical means. This adjustable feature mechanically closes the louver 319b (FIG. 14) at the appropriate time.
15 and 18) by the flap 328.
Or, 328a can be deleted. Furthermore, by making the louver adjustable, it is possible to select the appropriate inclination angle to most effectively separate a particular mass of particulates carried in a particular air flow or gas under pressure. It is something. 14 and 15 disclose the electromechanical configuration of this embodiment for filter assembly 240b. Similar to the previous example,
Each filter assembly has two mutually symmetrical louvered panels 316c and 316d. The louvers 319b are closed at their side ends 502. Each louver 319b includes a tubular member 503. Tubular member 503 is connected to panel 316
c and 316d are axially aligned with the mating tubular member 505 fixedly carried. A pivot rod 504 is received within the mating tubular members 503 and 505 for pivotally mounting the louver 319b. A lever member 506 is attached to louver 319b, and at each pivot point lever member 506 is attached to control arm 508. Filter assembly 240b is divided into three sections 261a, 261b and 261c similar to the previous embodiment. In order to obtain the transfer effects described in the previous embodiments, it is desirable to sequentially reverse each pulse wash zone from a to c to cause the particulates to be transferred toward the bottom of the filter. (Note that FIG. 14 is shown in a top-to-bottom format.) To accomplish this, the louvers in each section are connected by individual connection members (control arms) 508.
Each connecting member has a rack and pinion mechanism 51.
4,516 and 518 individually;
One of these mechanisms is shown in detail in FIG. 3
The pivot rod 504 is the pinion gear 52
0, 522, and 524, these pinion gears are in meshing engagement with rack and roller systems 526, 528, and 530, respectively. The rollers hold the rack in place while the rack engages the pinion gear. The rack is adjustably connected to solenoid armatures 532, 534 and 538 by stops passing through grooved portions of the armatures. The armature is located within solenoids 540, 542 and 544 which are adjustably mounted by grooved base stops on the filter assembly. Adjustment of the solenoid presets the inclination angle of the louvers. Pinion gear 520 is coupled to a louver in filter section 261a by pin 546. Similarly, pinion gears 522 and 524 are connected to pin 548 in the next filter section.
and 550. The remaining pivot rod 504 does not rotate on its own and is attached to the pin 552.
The pins 552 pass through the tubular member 505 and the respective rods 504 as shown in FIG. This allows each louver to freely rotate in response to movement of the respective control rod 508. The circuit shown in FIG. 17 is used to operate the pulse jet and is coupled to solenoids 540-544 to electromagnetically close the appropriate areas of the louvers when reverse pulse jet cleaning is performed. In circumstances where there is no requirement to close the louvers 319b, but the ability to adjust them is an important factor, the manual adjustment system 240c disclosed in FIG. 18 may be utilized. Solenoid 54
There is a board 602-606 instead of 0-544,
These have integral handles 608-612. The plate is a pivot point and lock nut 614-1
At 8, the rack and pinion 626-30 are pivoted as at 630-24. Any of the electromechanical or pure mechanical louver adjustment systems disclosed above may be used in conjunction with any of the airflow patterns for dust removal shown in the embodiments described above. Therefore, the 15th
Hole 332, which is drawn in phantom in the figure, can be deleted and replaced with a hole such as 416 in FIGS. 21 and 22. FIG. 17 discloses a simple schematic diagram of the preferred electrical connections, including the solenoid valve 450,
452, 454 are pulse jets 260a, 26
2a, 264a (for 450), 260b, 2
62b, 264b (for 452), 260c,
262c, 264c (for 454), and controls solenoids 540, 542, 5
44 etc. are for controlling the louvers. Control box 456 is in the nature of an electronic or electromechanical sequential control means for operating the three parallel circuits in the required sequence. It should be noted that the invention can also be practiced without a pre-cleaning mechanism. Figure 7 to 1
The embodiment shown in Figure 3 may be modified by removing the louvers and leaving the channels and flaps. As such, this device has the same reverse pulse and transport characteristics as the other embodiments described herein. The numerous features and advantages of the present invention have been described above along with details of the structure and operation of the present invention.
The novel features of the invention are pointed out in the appended claims. The disclosure is, however, illustrative, and changes may be made in detail, particularly in matters of shape, size, and arrangement of parts, within the broad general meaning of the term as expressed in the appended claims.