JPS6190718A - Air filter apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention is improved to provide a filter device that is removed from the top wall of a filter cabinet and operates at a greater air flow rate than previously required devices. The present invention relates to single and multi-configuration perforated media shielding or impingement air filter devices with backflow or backwash air filter cleaning devices.

In prior art perforated media impingement air filter and dust collection techniques, the development of so-called back jet or backwash filter cleaning devices complicates the construction of the air filter device and its supporting cabinet structure or housing. The reverse jet nozzle and valve or manifold must be removed or set aside to access the filter member, or the filter member must be removed from the bottom of the support housing. Both conditions have the disadvantage of making removal of the backside cleaning structure difficult and complicating the support structure for this structure. Accessing the filter element from the side or bottom of the filter housing has the particular disadvantage of requiring access to the so-called dirty side of the interior of the filter housing.

Another problem associated with the typical construction of pleated paper or similar type perforated media filter elements in back jet filter cleaning devices is that the air flow through the filter element is carried into the air stream and the filter element itself is removed. 42. The tendency to drive particulate material away from the filter element so that material that falls a large distance into the collection chamber is not propelled far enough away from the filter element to prevent it from being recollected almost immediately. The opposite jet air flow develops pressure pulsations with a certain gradient.

This practical case and other problems with prior art filters require a substantial reduction in the number of filter elements used in reverse jet air cleaning or scrubbing devices.

Another problem associated with conventional air filters is in applications consisting of material separation processes where the particulate material being separated from the process air has a relatively high humidity. In normal filter construction, this moisture tends to collect separated material on the bottom wall of the filter housing, and in refrigerated conditions there is a substantial amount of material within the filter housing that cannot be removed except by entering the housing. Build-up occurs, which necessitates shutting down the filter device. Additionally, water vapor condensation can occur in the backwash air control circuit, causing the control valves and conduits to freeze in typical configurations, thereby causing the backwash air system to fail.

Accordingly, there are several problems with the art of perforated media impingement or shielding type filter devices used in a wide variety of applications, which are not solved by the known types of filter structures. The usual way of configuring the filter cabinet, providing a reverse jet cleaning air device and access to the filter elements, prevents uneven loading of the filter elements, uneven and ineffective cleaning of the filter elements, repair or replacement. continue to present problems such as inconvenient access to filter elements, insufficient control over separated material release, etc. These and other drawbacks of conventional filter devices are overcome by the air filter device of the present invention.

SUMMARY OF THE INVENTION In response to the build-up of particulate material collected from airflow flowing through a filter member, the present invention provides for removing the build-up material from the filter member by a relatively low pressure backflow of air through the filter member. An improved air filter system of the type having a so-called shield or perforated media type air filter element that blows periodically is provided.

In particular, the present invention provides an air filter device in which a filter element is provided within a filter housing for removal from the top side of the housing without having to access the so-called "dry" side of the housing through a main material separation chamber. It is.

In two embodiments of the invention, the filter housing has a unique mechanical lifting mechanism that optionally removes the upper portion of the housing, and a pressure release mechanism that momentarily moves the upper portion of the housing upon excessive pressure build-up in the filter member. provided.

According to an important feature of the invention, the air exiting the filter housing through a chamber defined in part by a wall that typically receives the particulate material separated during the filtration process is brought to a temperature typically above ambient temperature. The filter housing can be constructed such that the walls are warmed by the filtered air to prevent the accumulation of moist or frozen material on the walls.

In accordance with another feature of the invention, the air filter arrangement is constructed with a so-called inversion configuration of a counterjet backwash air arrangement to remove particulate material that accumulates on the surface of the perforated media type filter element. The improved construction of the reverse jet backwash air device is such that the material is removed or propelled away from the filter member by a large distance such that the material falls away from the filter member or is removed or propelled by a large distance from the filter member. An air pressure gradient is provided to propel the filter backside cleaning. The configuration of the back jet backwashing device provides a more effective and uniform cleaning action than conventional devices.

According to yet another feature of the invention, the air filter apparatus is configured such that material carrying air entering the multichamber housing flows more uniformly around and through one or more filter members within the housing. It is configured in such a way that it is distributed as follows. Furthermore, the configuration of the control circuit associated with the reverse air jet valve in the lower part of the filter housing is based on a more compact housing structure, locating the reverse jet air circuit in the area heated by the process air flowing through the air filter device. , and is accessible for repair or replacement without the need for removal and disassembly for repair or replacement of the filter member itself.

The above-mentioned features and advantages of the invention, as well as other advantages, will become apparent to those skilled in the art from the following detailed description taken in conjunction with the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2 of the drawings, there is shown an improved air filter apparatus 10 according to one embodiment of the present invention. The air filter device 10 includes a cylindrical lower housing having a conical hopper 14 supporting a lower housing 12 at the top of a tank 16 for receiving fluid bulk materials such as dry cement, flour, or similar items. It has 12. Tank 16 can receive dust and other particulate matter separated from the airflow flowing through air filter device 10 . A conical hopper 14 transports objects to be separated from the air flowing through the air filter device 10 into the tank 1.
The air filter device 10 has a flange 18 that secures the air filter device 10 to a rotary air gun legacy valve 20 that can be opened continuously or periodically to discharge into the rotary air gun 6.

The lower housing 12 defines an interior chamber 22 and includes an inlet conduit 2 that directs dust-carrying air into the interior chamber 22 from an air source, not shown.
It communicates with 4. An inlet conduit 24 opens tangentially around the lower housing 12 into the interior chamber 22, so that the dust-carrying airflow entering the interior chamber 22 is directed to a cylindrical enclosure provided concentrically within the lower housing 12. That is, the cover 26
The change in direction is caused by a cyclonic or spiral swirl surrounding the

The shroud 26 is supported by a lateral top end wall 28 having a circular opening 30 in the center.

Also referring to FIG. 6, the support bracket 32 is provided with a sleeve 66 that extends across the lower housing 12 and supports the guide support member 64 of the cylindrical filter member 36. As shown in FIG. The guide support member 64 is connected to the air filter device 10
It has a bottom plate 68 extending in a direction transverse to the vertical solid axis 40 of. An axially extending locating pin 39 extends through a cooperating hole 41 in the support bracket 62. Further, the guide support member 34 has a central tubular column member 42 extending into the sleeve 33, and a plurality of partition plates 44 extend radially from the column member 42. Filter member 36 is of the well-known type characterized by an annular pleat-sealed perforated shielding member 67 supported between opposing top and bottom lateral walls 43,45.

1 and 2, the air filter device 10 includes a first cylindrical wall 4 forming part of a clean air discharge duct.
A cylindrical upper housing 46 is provided having an upper cylindrical wall 8 and a second cylindrical wall 50. The upper housing 46 has a lateral bottom wall 52 and a top wall 54. The bottom wall 52 is defined by an opening 58 concentric with a vertically extending tube 60 for the flow of clean air. Bottom wall 52 is adapted to support an annular resilient gasket 62 secured to bottom wall 52 by suitable fasteners 64.

An actual watertight seal is formed between the end wall 28 and the bottom wall 52 as shown in FIG. Upper housing 46 is resiliently secured to lower housing 12 with end wall 28 and bottom wall 52 immediately adjacent to each other and separated only by resilient socket 62 . In this regard, as shown in FIGS. 1 and 2, the bottom wall 52 has three circles adapted to align with cooperating bosses 68 formed in the end wall 28, two of which are shown in FIG. Posts 66 are provided at intervals in the circumferential direction. The bosses 68 are suitably threaded to receive the threaded ends of the elongated rods 70, with each rod 70
A coil spring 73 between the post 66 and the shoulder 72 cooperating with the
It has a shoulder portion 72 for holding.

Filter member 66 extends through guide tube 78 and connects head 7
It is secured to the bottom wall 52 of the upper housing 46 by an elongated threaded member 76 that engages a guide tube 78 at 7 . Guide tube 78 is supported within tube 60 by a radially extending partition plate 79 that is preferably aligned with partition plate 44 . Threaded member 76 comes into threaded engagement with the cooperating threaded upper end of post member 42. Therefore, the filter member 36
2 and bottom plate 38 into watertight engagement. A suitable annular gasket or seal 80 is attached to the end walls 43, 45 and adjacent bottom wall 52 of filter member 36 as shown in FIG.
and the bottom plate 38.

The upper housing 46 is movable vertically upwardly from the lower housing 12 and pivoted axially about the axis 40 away from the opening 30 so that the filter member 66 can be removed from the interior chamber 22 . Referring to FIG. 1.5, the upper housing 46 includes a cylindrical sleeve bearing member 84 that is axially slidably and rotatably sleeved over a vertically extending hinge pin 86. It is being The hinge pin 86 is supported by the lower housing 12 for vertical axial movement within a bearing tube 87 secured to the lower housing 12 by a web 89 . The upper housing 46 is connected to the lower housing 12 for pivoting about the central longitudinal axis of the hinge pin 86 by a linkage mechanism having a handle 88 pivoted at 90 to the hinge pin 86 and pivoted at 91 to one end of the link 92. It can rise vertically. link 92
is a bracket 94 fixed to the outside of the lower housing 12.
It is pivoted at one end. As shown in FIG. 1, the handle 88 is in the stowed position and the clevis 9 of the upper housing 46 has a removable retaining pin 98 extending therethrough.
It can be fixed by 6. In response to pivoting of the handle 88 towards the pivot 90 in a clockwise direction as viewed in FIGS.
Upper housing 46 can be vertically raised from the position shown in FIG. 1 to the position shown in FIG. 5 by an axial extension of hinge pin 86 that engages end wall 83. rod 7
0 and the screw member 76 are of course separated from the bottom plate 38 and the guide support member 34. The upper housing 46 can pivot about the axis of the hinge pin 86 as shown in FIG. 4 to access the filter member 36.

Referring to FIGS. 1 and 2, the upper housing 46 allows clean air to flow from the inside clean air outlet 99 of the filter member 36 to the top wall 54.
defines an interior chamber 98 which flows through an opening 101 into an outlet conduit or duct 100 . The interior chamber 98 includes a plurality of counterflow air jet manifolds 1 supported on the annular supply air manifold 104 and mounted directly over the flow tubes 60.
02. Manifold 102 is in communication with supply manifold 104 by flow control valve 105 whereby periodic discharge of counterflow air jets from manifold 102 toward flow tubes 60 is obtained to clean filter member 36. A further description of the reverse jet clean air system, unless necessary for the practice of this invention, is not contemplated and reference may be made to US Patent Application Serial No. 549,963, filed Nov. 7, 1983. Access to the inner v98 is achieved through an opening 107 closed by a removable cover 108 secured to the top wall 54 by suitable retaining members 110. Thus, when it is desired to gain access to the interior chamber 98 to remove the rod 70 and screw member 76, the cover 108 can be removed and the upper Housing 46 and lower housing 1
The rod 70 and threaded member 76 can be easily accessed to release the fixation of the two. The Ron door 0 and the screw member 76 are so-called T
Shaped handle portions 111 are preferably provided to facilitate manual installation and removal of each component. When removing the rod 70 screw member 76, rotate the handle 88 to lift the upper housing 46 to the position shown in FIG. is rotated, thereby allowing filter member 36 to be easily removed from guide support member 34 and replaced.

A particularly advantageous advantage of the construction of air filter device 10 is the removal of filter member 36 from the so-called clean side of the air filter device. This is because the filtration of the dust-carrying air is carried out in the inner chamber 2.
2 flows into the air chamber 99, and further flows into the inner chamber 98 and flows into the air chamber 99
It is based on the fact that it is carried out so that it passes through 00 and is finally released. Accordingly, the operator managing the air filter system is not required to access the filter member 66 through the interior chamber 22. Of course, the filter element 36 can be inspected and, if necessary, replaced by a similar filter element, not shown, into which the opening 3o in sleeve-like relationship with the guide support element 64 can be inserted. The guide support member 34 itself is a filter member 66
The screw member 76 can be removed from the lower housing 12 associated with the guide support member 64 by screwing the screw member 76 loosely into a threaded socket formed in the upper end of the guide support member 64.
6 can be used to perform Kokichi suitably. Guide support member 34
When reinserted into the operative position shown in FIG. Lower housing 12 and upper housing 46 are aligned with each other by locating pins 116 of FIG. 4 and cooperating pin holes formed in bracket h 115.

Another important feature of the air filter device 10 is that when the pressure difference between the inner chamber 98 and the inner chamber 22 exceeds a predetermined value determined by the spring force of the coil spring 73, the lower housing 12 and the upper housing 46 are elastically moved. It is about the ability to be able to move.

If the filter member 36 becomes clogged with dust, the filter member 3
The pressure drop at 6 becomes greater and the filter member 36, determined by the fluid pressure acting on the axially projecting portion of the bottom wall 52 and the opening 30, holds the upper housing 46 vertically upwards against the spring force of the coil spring 73. A resultant force is generated that increases the Thus, based on the compression and spring rate of coil spring 73, the predetermined pressure at which upper housing 46 is pushed away from lower housing 12 can be selected. If the predetermined pressure in the inner chamber 22 is achieved, even if the dust-carrying air leaks through the air filter 1° between the lower housing 12 and the upper housing 46, this separation between the upper and lower housings is clogged or damaged. It serves to warn of a filter condition so that the device supplying dust-carrying air to the air filter system 10 can be shut down and the air filter system can be inspected and repaired. The upper housing 46 is preferably provided with a peripheral flow deflection skirt to direct the emitted air downwardly along the lower housing 12 and to prevent water from entering the interior of the air filter device 1o.

Referring now to FIG. 7, there is shown an air filter system according to the present invention which is particularly adapted to so-called negative pressure filtration systems, various dust control systems, etc., which can be used for a number of applications including the pneumatic conveyance of particulate material. A variation is shown. The air filter device 120 shown in FIGS. 7 and 7A has a lower housing 122 having a downwardly extending conical material collection and discharge housing portion 124. The conical housing portion 124 is
A bottom discharge opening 126 to which a deterrent valve or other suitable enclosure 127 can be connected to discharge material in response to pressure equalization between ambient pressure and air pressure inside the interior chamber 126 of the lower housing 122. have. Lower housing 12
2 is a filter member 13 supported by a guide support member 34;
6 has a lateral top wall 128 having a central opening of 16°. Guide support member 34 is maintained in place on support bracket 32 . Dust-carrying air is introduced tangentially into the interior chamber 123 of the lower housing 122 via an inlet conduit 125 and is prevented from directly impinging on the filter member 62 by a downwardly depending cylindrical baffle member 162 secured to the top wall 128. It is prevented. Heavy dust is also subjected to gravity and centrifugal force, and is deposited and separated from the air flowing into the inner chamber 123,
is collected at the bottom of the conical housing portion 124 for release from the air. Air flows through the filter member 66 into the interior chamber 134 formed within the filter member 36 and upwardly through a flow tube 129 provided within the cylindrical upper housing 136 .

The upper housing portion 166 has a cylindrical side wall 137 that receives a flow of clean air from the interior chamber 164 and directs the clean air to a vacuum pump or suction fan 142 having a drive motor 146.
defines an interior chamber 138 that discharges through an outlet conduit 140. Further, the upper housing portion 136 is connected to the top wall 14
4 and a bottom wall 146. The entrance/exit 145 is the top wall 14
4 and is closed by a removable cover 148. Flow tube 129 has a central guide tube or boss 131 supported by a partition plate 133 in a manner similar to air filter device 10 . Threaded member 76 extends through guide tube or boss 131 and secures filter member 66 with a suitable gasket or seal 80 between bottom wall 146 and bottom plate 38. A reverse jet filter clean air supply manifold 152 is provided in place of flow tube 129 and includes a reverse clean air jet manifold 102 and control valve 10 similar to the configuration described in connection with FIGS. 1-4.
It supports a plurality of conduits 153 which can support 5. Further, the upper housing 166 is connected to the air filter device 1.
0 is supported by the lower housing 122 in a similar manner. The upper housing portion 136 is provided with a bearing sleeve 154 having an upper lateral end wall 155 and a vertically extending hinge pin 86 axially slidably supported in a bearing tube 158 which is supported by a web 159 secured to the lower housing 122 .
You can receive it. Lift handle 88 is pivoted to hinge pin 86 at pivot pin 90 and connected to link 92 . Link 92 is pivotally connected at the opposite end to a bracket 160 secured to lower housing 122. Handle 88 is retained by clevis 96 and retaining pin 97, similar to the configuration of air filter device 10, when handle 88 is not used to lift upper housing 136 from the top of lower housing 122. The hinge pin 86 can also be raised by other means, such as by providing a cooperating force thread on the pin 86 and the bearing tube 158.

Filtered air is prevented from leaking between the bottom wall 146 and top wall 128 of the upper housing 136 by an annular seal ring 162 . The enclosure 137 includes a pin 172 extending from the flange 166 through a cooperating hole in the flange 168.
is aligned with the lower housing 122 by. Referring also to FIG. 7A, - the upper housing portion 136 has one seventh
The lower housing 22 is connected to the lower housing 22 by means of a plurality of circumferentially spaced connector members, two of which are shown in FIG.
The connector member is pivotally secured to the outer wall of the lower housing 122 by a clevis-type bracket 174 and engages a cooperating bracket 175 suitably secured to the outer wall of the upper housing portion 136. It has a T-shaped connecting pin 173 that can be swung into position.

Each connecting pin 173 is provided with a retaining nut 177 on the threaded end thereof, and a coil spring 178 is mounted around the connecting pin 173 between the retaining nut door 7 and a stop member 179 slidably supported on the pin 173 in sleeve relation. keeping.

Each stop member 179 is provided on the flange 1 to resiliently urge the upper housing portion 136 into engagement with the lower housing 122.
It has a laterally projecting portion 171 operable to engage with a bracket 175 of 66.

The predetermined pressure difference across filter member 36 is
The upper housing part 136 is pushed into the inner chamber 1 when a pressure is built up acting on the axially projecting part determined by 0.
Coil spring 17 to reduce the pressure difference between 23 and 138.
8 is moved upwardly relative to the lower housing 122 moving the stop member 179 against the spring force of 8. Additionally, spring biased stop member 179 seals link 162 to prevent leakage between lower housing 122 and upper housing portion 136.
equalizes the forces acting on

By removing the cover 148 and removing the threaded member 76, the connecting pin 176 can swing outward and downward from the bracket 175, so that the upper housing part 136 can be vertically moved upward by rotation of the handle 88 so as to lift the upper housing part 166. It is possible to increase the number of times. ” housing part 136
(Well, in order to remove the filter member 36 from the inner chamber 126, move the hinge pin 8 to a position where it can approach the filter member 36.)
It can swing around the axis of 6.

Referring now to FIG. 6, the air filter device 1 is shown in FIG.
A modified air filter device 180 similar to 0 is shown. The air filter device 180 is mounted on the lower housing 1 to form a housing portion 182 adapted to be attached to a horizontal top wall 184 of a particulate material storage tank 186.
The air filter device 10 has substantially all the configurations of the air filter device 10 except that the air filter device 2 is modified. Housing portion 182 has a lateral top wall 28 with a central opening 30 for removing filter member 36 from inner body 185 . The storage tank 186 has a horizontal deck 190 with the exception of a top wall 184 and a particulate material inlet fitting 192 optionally connected to a conduit 194.
, which allows fluidized or pneumatically conveyed particulate material to be discharged into the interior chamber 196 of the storage tank 184 .

A suitable shutoff valve 193 is provided in conduit 194 as shown. The housing part 182 is open at the lower end 183 so that the dust-carrying air in the storage tank 186 can pass through the air filter device 180 by flowing into the interior of the housing part 182 and be exhausted through the filter element 66 . Of course, the housing portion 182 can be modified to include an inlet conduit 191 similar to the inlet conduit of the air filter device 10. Accordingly, by adding air filter device 180 to have a portion of housing portion 182 extending into a particulate material receiving tank, such as storage tank 186,
The overall height of the air filter device can be reduced and the filter member 36 can be easily accessed for repair or replacement. The air filter device 180 also includes a manual operation device 18.
The provision of the discharge duct 100 with a butterfly valve closing device 187 having 9 can be applied to marine transport, which allows the air filter system and storage tanks to be removed when the vessel is sailing in heavy seas without the filter in use. Duct 100 can be closed and sealed to prevent water from entering 186. Valve closing device 187 is also shown in FIGS. Valve closure device 187 is one example; other types of closure devices may be used in duct 100.

Referring now to FIGS. 8 and 9, another embodiment of an air filter apparatus 210 is illustrated. Air filter device 21
0 has a cylindrical cabinet or housing 212 with cylindrical side walls 213, a lateral top wall 214, and a lateral bottom flange 216 for attaching the housing 212 to a material storage tank 217. .

Housing 212 can be configured to support or connect to another type of material storage tank, not shown. housing 2
12 forms a contaminated air chamber 218 which is communicated with an interior chamber 219 of the material storage tank 217 by a passage 220 . The housing 212 may communicate with a source of material conveying air, not shown, by an inlet conduit 222 opening into the interior 218 at an opening 224 tangentially to the periphery of the housing 212 . The opening 224 is also adjacent to a cylindrical enclosure 226 depending from the top wall 214. enclosure 22
6 is open at the bottom edge 227 and forms a secondary separation chamber 228 in which the filter element 36 is provided. Filter member 36 is supported within a tube 228 on support plate 242 that is supportingly connected to a depending clean air flow conduit 244 extending downwardly from lateral cylindrical support plate 242 . conduit 244
is supported by and extends through an angled wall 246 formed within the housing 212 . A retaining rod 248 extends upwardly from the support plate 242 and extends upwardly from the support plate 242.
It is threaded to accept 250. Cylindrical bottom wall 2
A cylindrical dish-shaped shroud 252 having a diameter of 54 extends across the upper end of the filter member 36 adjacent the end wall 46 and forms a blind end of a clean air flow passageway 256 formed within the filter member 36. . Clean air flow passageway 256 communicates with the interior of conduit 244 by a suitable opening 257 in support plate 242 so that clean air can flow through housing 21.
Conduit 2 within a clean air flow chamber 258 formed within 2.
A Kokichi flowing downward is formed through 44. The chamber 258 has an inclined wall 246, a vertical wall 260, a horizontal bottom wall 262, and a side wall 213.
It is formed by. Clean air can exit chamber 258 through outlet conduit 264. The special configuration of the air filter device 210 allows a flow of material carrying air at a so-called pressure, i.e. at a pressure higher than atmospheric pressure, to flow through the conduit 222 into the interior of the housing 212 . In addition, the conduit 26
An outlet passageway from chamber 258 provided at 4 allows air to enter the vacuum type device via air filter device 210 and communicates with a suction fan or pump, not shown.

Filter member 36 is supported by support plate 242 and a resilient cassette or seal 80 is interposed between end wall 45 and support plate 242 . Similar seal 80 or end wall 43 and cover 2
Interpolated between 52 and 52. Access to the separation chamber 228 for repair or inspection of the filter member 36 is provided by suitable fasteners 251.
A circular cover 2 is fixed to the top wall 214 and covers the opening 253 with a diameter corresponding to the inner diameter of the enclosure 226.
This can be achieved by removing 49.

Therefore, the filter member 36 is connected to the cover 249 and the nut 2.
50 and cover 252 from top wall 214 and lift filter member O 6 upwardly from support plate 242, it can be easily removed from separation chamber 228. A second gasket or seal 247 is connected to a cover 252 and a cover 249.
interposed between. In this manner, repair or inspection of filter member 36 does not require accessing the interior of nozzle 212 beneath filter member 36 or through contaminated portions of interior chamber 218.

Referring to FIG. 8, the air filter device 210
It also includes a reverse air jet type filter element washer having a valve 270 disposed within 58 and positioned generally on the longitudinal centerline of conduit 244. Valve 270 has a discharge nozzle 272 that directs a jet of pressurized air upwardly through conduit 244 and passageway 256 to impinge on bottom wall 254 . Valve 270 is supported by a rigid conduit 276 supported by lateral stepped walls 278 . Wall 278, side wall 216 and top wall 28
2 and the bottom wall 283 form a pressurized air chamber 280 within the housing 212. Pressurized air is supplied to interior chamber 280 by conduit 284 that communicates with a source of pressurized air 285 . valve 27
It is possible to use a suitable control device (not shown) to operate 0. Such a control system may be of the type described and described in U.S. Pat. No. 4,465,497, issued Aug. 14, 1984. Counter jets of pressurized air and carrier air are periodically generated to flow upwardly through conduit 244 into chamber 256 and diffuse radially outwardly to separate the particulate material into separation chamber 228, interior chamber 218, Particulate material may be washed from the outer surface of filter member 36 downwardly into tank interior 219 through passageway 220 .

At least a portion of the material that is washed away from the filter member 36 and separated by redirecting the air flow into the interior chamber 218 hits the sloped wall 246 and flows downwardly through the passageway 220 . In some conventional air filter systems, if the material is particularly moist, it tends to accumulate on the sloped wall 246, and if the ambient temperature is below freezing, it begins to accumulate on the sloped wall 246 and freezes into a solid. , inner chamber 218
and, in severe cases, impede the separation process. However, the configuration of the clean air flow v 258 and the sloped wall 246 allows the sloped wall 246 to be maintained at a temperature near the temperature of the air being treated so that this air warms the side walls, and the sloped wall 246 facing the interior chamber 218 is heated by this air. This reduces the chance of significant build-up of particulate material on the surface.

The present invention also enjoys the unexpected benefit of the feature of backflow air scrubbing in the removal of accumulated particulate matter or "guest particles" from the outer surface of the filter member 3.

Referring to FIG. 10, a relatively high velocity jet of backwash air is discharged upwardly from valve 270 through conduit 244 so that it can exit through filter member 66 after hitting shroud 252. 2 is a schematic diagram showing the filter element 33, enclosure 223, shroud 252, and conduit 244 in conjunction with a curve showing the static pressure measured at various points in the separation chamber 228 in inches of water diameter for a series of tests such as .

The static pressure shown by the Pitot tube reading curve 290 is highest at point 290a just below the bottom 252 and tapers off toward the bottom of the filter member 66 at points 290b and 290c. Curve 290 illustrates the relative radially outward velocity gradient along filter member 36 between shroud 252 and support plate 242.

Furthermore, the diagram including curve 292 shows points 292a, 2 in the measurement of the vertically downward velocity component of the airflow during backwashing.
92b, showing the pitot tube readings at 292C, showing that the maximum flow rate occurs at measurement point 292a and tapers off toward measurement point 292C. Therefore, the maximum radial outward flow velocity and vertical downward flow velocity are designed to prevent re-entry of material from the filter element surface by air flowing through the filter element 36 into the separation chamber 228 during normal filtration operations. This occurs in the upper part of the filter member 36, which ensures greater effectiveness in the removal of particulate material.

Referring to FIG. 11, an alternative embodiment of an air filter apparatus 338' is shown with a contaminated airflow interior 341'.
is characterized by a rectangular cabinet or housing synchro 40. housing 340
has a top wall formed by a plurality of hinged doors 342, six of which are shown, providing access to interior chamber 341 for insertion or removal of a plurality of filter members 36. Can be opened selectively.

The filter member 36 is supported within the housing 340 in the same manner as in the previous embodiment in which the filter member 36 is supported within the housing sink 212, with a respective surface shroud 325 secured to the upper side of the filter member 36 to connect the filter member 36 and the door 642. is set between. Each filter member 36 can be appropriately separated from adjacent members by partitions 346, 345. The partitions 345 each have a looper 347 and form an opening from the chamber 341 to the chamber 346, and a filter member 66 is provided in the chamber 346. Dividers 345 and loopers 347 direct airflow more uniformly into each separate filter chamber 346 and
Material removed from one filter element is prevented from remaining on an adjacent filter element. Two doors 642 are shown in an open position to illustrate the internal configuration of the filter member. Door 342 can be locked in the closed position by any suitable means not shown.

Housing 340 includes spaced vertical channel walls 348.
Opposed sloping walls 349 are provided extending from the outer housing side walls 353 and 354 toward a central groove 357 formed by the bottom wall 350 and the bottom wall 350 .

Clean air chambers 355, 356 are formed between the sloped wall 349, the housing end wall, the side walls, the bottom wall and the channel wall 348. The chambers 355, 356 are connected to a clean air chamber 661 provided on the end wall 351, and to the chambers 355, 35 through the air chamber 661.
6 and a suction air pump 358 that draws clean air out of the air.

Dust-carrying air enters the chamber 341 by an inlet conduit 369 that enters the chamber 341 through the end wall 351.

Each filter member 36 communicates with a clean air discharge flow conduit 360 that extends downwardly through the sloped wall 349 and opens into the clean air chambers 355,356. Although only three or four conduits 360 are shown in FIG.
is constructed in a manner similar to that of the construction of FIG.
It will be clear to those skilled in the art that the air is discharged into the clean air chamber 355j56 through the air. The conduit 360 is connected to the clean air chamber 3
55, 356 and terminates immediately above a backflow jet flush valve 670 which communicates with a source of pressurized air, not shown. Accordingly, each filter member 36 of the air filter device 338 is removed from the clean air flow chamber portion by opening the associated door 342 and removing the filter member shroud 325.
Accessible for replacement repair by grasping 6 and taking it out for repair or replacement. Of course, shroud 625 is sealingly engaged with door 342 by a suitable gasket, such as seal 247 shown in FIG.

Furthermore, the arrangement of the flush valve 370 and the sloped wall 649 are intended to maintain this configuration at a temperature corresponding to the air exiting the air filter device 338. Each cleaning valve 370
is a pressurized air source (not shown) or U.S. Patent No. 4,465,4.
It can be connected to a continuous control circuit that opens each flush valve in a predetermined order as described in '97.

Although preferred embodiments of the invention have been described in detail herein, various modifications and changes may be made to the particular embodiments shown and described without departing from the scope and spirit of the invention as set forth in the claims. It will be obvious to those skilled in the art that this can be done.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of an embodiment of the air filter device taken along line 1-1 in FIG. 2, FIG. 2 is a partially sectional plan view of the air filter device shown in FIG. 1, and FIG. The figure is 3 in Figure 1.
4 is a perspective view showing the top housing of the air filter device swung from the bottom housing to provide access to the filter element; FIG. 5 is a housing operation with the top housing in the raised position; FIG. 6 is a partial cross-sectional view showing the mechanism; FIG. 6 is a partially cross-sectional elevational view of a modified air filter device according to the present invention installed on the top of a marine granular material storage tank; FIG. 7 is a so-called negative air filter device; Longitudinal sectional view of another embodiment of the present invention used in a pressure filtration device, No. 7
Figure A is a partial cross-sectional view taken along line 7A-7A in Figure 7;
The figure is a longitudinal cross-sectional view of another embodiment of the air filter device according to the present invention, and FIG. 9 is a cross-sectional view taken along line 9-9 in FIG.
Figure 10 is a schematic diagram showing the backwashing air pressure and velocity gradient;
FIG. 11 is a perspective view of an embodiment of a top-loaded air filter device. In the figure, 10, 120, 180, 210° 368 = air filter device, 12.122: lower housing, 14: hopper, 16: tank, 20° 270: valve,
22,98,123,134,138,196°219
．． 280: Inner room, 24,191,222,369:
Inlet conduit, 26,252,325: cover, 30,58°101.107,224.25!1,257: opening, 6
6: Filter member, 44.79: Partition plate, 46: Upper housing, 64: Fastener, 70: Rod, 76°178:
Coil spring, 78: Guide tube, 80: Seal, 88: Handle, 94 Nib bracket, 96: Clevis, 99: Air chamber, 100: Duct, 102.104, 152: Manifold, 105: Control valve, 108.148, 249 : Cover, 110: Holding member, 115.160,174,1
75 Nibracket, 127°226 = Enclosure, 142: Suction fan, 182: Housing section, 186: Storage tank, 193: Shutoff valve, 212, 340; Housing, 2
28: Separation chamber, 242: Support plate, 246, 349: Inclined wall, 248: Holding rod, 251: Fastener, 258° 355.356: Clean air chamber, 285: Pressure air source, 3
41.346: Chamber, 358: Suction air pump. -゛-I

Claims (1)

[Scope of Claims] 1. A housing forming a material separation chamber; an inlet conduit communicating with the housing for conducting particulate material carrying air to the separation chamber;
a lateral wall of the housing forming part of a separation chamber, a device opening through the lateral wall into the housing and forming a hole of sufficient diameter to permit insertion and removal of a filter member of the shielded type with respect to the separation chamber; separating particulate material from an air stream, comprising a filter element, a filter support device for supporting the filter element within the separation chamber such that the filter element can be inserted into the side wall and removed from the aperture without having to enter the separation chamber; Air filter device for. 2. The housing has a first section defining a separation chamber, the inlet conduit communicates with the separation chamber to create a substantial swirling flow of air entering the separation chamber, and the housing has a first section defining a separation chamber, the inlet conduit communicating with the separation chamber to create a substantially swirling flow of air entering the separation chamber, and connecting the filter element and the housing around the filter element. 2. An air filter device according to claim 1, wherein the housing includes an enclosure located between the housing and the wall forming the first section of the housing. 3. The housing has a first section having a separation chamber and a second housing section secured to the first section to receive filtered air from the filter member, the second housing section being detachable from the first housing section. 2. An air filter device as claimed in claim 1, further comprising a fixing device whereby the second housing section can be moved out of the aperture in the side wall sufficiently to allow removal of the filter member from the first housing section. . 4. The filter support device has a plate member engaged with one end of the filter member, a first elongated support member secured to the plate member and extending into the clean air flow chamber defined by the filter member, and a second housing. 7. The air filter apparatus of claim 6, wherein the section has a clean air flow tube extending from the end wall of the second housing section and communicating with the clean air flow chamber. 5. The second housing section has a lateral wall portion forming an opening for directing filtered air from the filter member into the clean air flow chamber of the second housing section, and a sealing device interposed between the lateral wall portion and the filter member. Claim No. 4
Air filter device as described in section. 6. Directly to the atmosphere having a pressing device for elastically biasing the second housing section towards the lateral wall of the first housing section to form a seal between the lateral wall of the first housing section and the cooperating wall of the second housing section; a pressure release device for evacuating the separation chamber to evacuate the separation chamber, the pushing device being responsive to a predetermined pressure in the separation chamber to move the second housing section a limited distance relative to the first housing section to break the seal; The air filter device according to item 4. 7. The pressing device has a plurality of retaining members fixed to one of the first and second housing sections to support a spring device between the first and second housing sections, the spring device preventing movement of the second housing section. 7. An air filter device according to claim 6, which is bendable to allow the air filter to be bent. 8. The air filter device of claim 7, further comprising a removable cover on the second housing section for closing the proximal aperture adjacent the retaining member. 9. The second housing section is connected to the first housing section by a hinge device, the hinge device including a hinge pin connecting the housing sections and a second housing section with respect to the first housing section.
5. An air filter device according to claim 4, further comprising an actuating device for moving the housing section so that the filter member can be removed from the first housing section through an aperture in the side wall. 10. The hinge pin is supported by a bearing device of one of the first and second housing sections for pivoting relative to the first housing section, and the actuating device is mounted on the first housing section in an axial direction relative to the longitudinal axis of the hinge pin. a linkage secured to the first housing section and an actuating lever coupled to the hinge pin for moving the second housing section away from the opening in the side wall; The air filter device according to claim 9, which is rotatable around an axis. 11. Claim 4 comprising a counterflow air jet filter member provided in the second housing section having at least one air jet device provided in alignment with the flow tube.
Air filter device as described in section. 12. The device for releasably securing the second housing section to the first housing section includes a locking device mounted remotely from the exterior of one of the housing sections and engageable with a cooperating locking device of the other housing section. the pushing device has a plurality of connecting pins supporting the locking device, and the pushing device has a spring device that biases the locking device to engage the locking device and allows limited movement of the housing section relative to the other housing section at a predetermined pressure. An air filter device according to claim 6. 13. A downwardly extending clean air flow tube in communication with a clean air chamber formed by the filter member to direct clean air from the filter member to a clean air outlet in the housing, coupled to the housing for removing the filter member from the aperture. a cover that can be moved to open the housing from the top side;
3. An air filter device according to claim 1, further comprising means for discharging a flow of pressurized air in the flow tube in a direction opposite to the normal clean air flow to remove buildup of particulate material from the filter member. . 14. The housing has an angled wall for receiving separated material from the air flow, the angled wall being provided to divide the housing into a separation chamber and a clean air chamber receiving air from a flow tube, the flow tube extending through the wall. 14. The air filter device of claim 13, wherein the air filter device extends through and communicates with a clean air chamber within the housing. 15. having a top seal engageable with the filter member to seal a clean air chamber within the filter member at one end of the filter member from direct flow communication with the separation chamber; 15. An air filter device according to claim 14, further comprising a cover member provided therein. 16. Claim 13, comprising a plurality of filter members disposed within the separation chamber, each filter member communicating with a clean air flow tube within the housing to direct a flow of clean air from the filter member. air filter device. 17. having a partitioning device in the separation chamber separating the filter members from lines of flow communication visible to each other, spaced apart to form openings for admitting the air to be filtered into each of the plurality of filter members; 17. The air filter device of claim 16, wherein the partition device includes an inlet air louver. 18. A pressurized air flow discharge device is provided with a radially outwardly directed air flow to remove buildup of particulate material on the filter member, and wherein the velocity of the radially outwardly directed flow is such that the velocity of the radially outwardly directed flow reaches the top end of the filter member. 17. The air filter device according to claim 16, wherein the air filter device is provided so that the flow of pressurized air is applied to a wall formed across the top end of the filter member so as to increase in size. 19. A housing having a top wall and side walls having a forming device for creating a lateral top wall forming an enclosed separation chamber, with openings in the housing to direct air with the conveyed particulate material into the separation chamber. a forming device for forming, a discharge device for ejecting separated material within the separation chamber from the housing, and a perforated media shield supported within the separation chamber between a bottom sealing device at one end of the filter member and a top sealing device at the other end of the filter member. an impingement-type filter element, a clean air discharge flow tube communicating with the clean air chamber formed by the filter element for directing clean air from the housing, connected to the housing and opening the housing from the top wall side to remove the filter element; Air filter device for filtering particulate material and conveyed air with a removable cover that can be moved to 20. Claim 17, wherein the filter member support device includes a plate disposed within the housing and supporting a bottom seal device, the flow tube extending downwardly from the bottom plate into the device forming a clean air discharge conduit. The air filter device described. 21. A housing having a device for creating a lateral top wall forming an enclosed material separation chamber and a side wall device, a device for introducing air together with the granular material conveyed into the separation chamber, and a housing for separating the separated material in the separation chamber. a material ejection device for discharging from the filter member, the filter member being configured to direct clean air from the filter member to a clean air chamber defined within the housing by a common wall between the air chamber and the separation chamber and below the filter member; a clean air flow tube communicating with the clean air chamber connected to the housing and operable to open the housing from the top wall to remove the filter member; a cover operable to open the housing from the top wall to remove the filter member; an air filter device for filtering the air in which particulate material is conveyed, comprising a device disposed within the air chamber to emit a discharge flow of pressurized air into a flow tube in a direction opposite to the normal clean air flow to remove it from the air; .