Gas separation – With nonliquid cleaning means for separating media – With automatic control of cleaning means
Reexamination Certificate
1999-09-16
2001-10-16
Smith, Duane S. (Department: 1724)
Gas separation
With nonliquid cleaning means for separating media
With automatic control of cleaning means
C055S302000, C095S280000
Reexamination Certificate
active
06302931
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS, IF ANY
None
FIELD OF THE INVENTION
The present invention relates to a pulse jet type filtering dust collector. Particularly, the present invention relates to an apparatus for injecting a compressed air into a dust collector, in which an air header injects compressed air, and a control box controls the operation, the air header including an extrusion-molded aluminum cylinder and a plurality of pulse valves, and the control box including a plurality of separate solenoid control valves. Thus the constitution of the apparatus is simple, its assembly is easy, and the operation is stable.
BACKGROUND OF THE INVENTION
Generally, a filtering dust collector captures dust particles from a gas by using a filtering cloth, and this dust collector is classified into various kinds in accordance with the method of removing the adhered dust particles. In a pulse jet filtering dust collector, a compressed air is periodically spouted into the inside of the filtering cloth in a direction opposite to the filtering direction, thereby detaching the adhered dust particles from the filtering cloth.
FIG. 1
is a perspective view of a part of the conventional filtering dust collector, and
FIG. 2
is a sectional view of the conventional filtering dust collector. As shown in these drawings, a dust collecting tank
1
accommodates a plurality of filtering cloths
3
secured to a securing plate
2
. A bag cage
4
is attached to each of the filtering cloths
3
, and a venturi tube
5
is connected to the upper portion of the filtering cloth
3
within the filtering cloth
3
.
Outside the dust collecting tank
1
, there is installed a header cylinder
100
of an air header. This header cylinder
100
is provided with a plurality of discharge holes
101
on its top, and each of the discharge holes is connected to a ball valve
102
. Each of the ball valves
102
is connected to a pulse valve
103
, and each of the pulse valves
103
is connected to a connecting tube
106
, while each of the connecting tubes
106
is connected to an air injecting pipe
13
. Onto the wall of the dust collecting tank
1
, the ends of the air injecting pipes
13
are secured by means of connectors
14
. Each of the air injecting pipes
13
is provided with a plurality of nozzles
15
, and each of the nozzles
15
is disposed directly above the opening of each of the filtering cloths
3
. The other end of each of the air injecting pipes
13
is secured to the inside of the wall of the dust collecting tank
1
by means of a fastening member
16
.
The pulse valve
103
has an inletting hole
103
a
in the lower portion of it and a discharge hole
103
b
in the front portion of it. The lower inletting hole
103
a
is connected to the ball valve
102
, and the front discharge hole
103
b
is connected to the connecting tube
106
, while a solenoid valve
104
is connected to a side of the pulse valve.
In this conventional filtering dust collector, the air which contains dust particles is introduced through an inlet
1
a
into the dust collecting tank
1
, while the filtered air is discharged through an outlet
1
b
. In this manner, the dust particles which are contained in the air are filtered and adhered on the outside of the filtering cloth
3
, with the result that the clean air is discharged through outlet
1
b
.
Periodically, the pulse valves
103
which are coupled to the header cylinder
100
are opened, and thus, the compressed air which is contained in the header cylinder
100
is spouted through the pulse valves
103
and through the nozzles
15
of the air injecting pipes
13
into the interior of the filtering cloths
3
. Therefore, the filtering cloths
3
strongly vibrate, and the dust particles which adhere on the outside of the filtering cloths
3
are detached from the filtering cloths
3
to be collected to the bottom of the dust collecting tank
1
. These collected dust particles are discharged from the bottom of the tank
1
through a rotary discharge valve
105
.
In this conventional dust collector, the header cylinder is manufactured in the following manner. That is, flanges are welded to both ends of a cylindrical pipe, and compressed air supplying pipes are connected to the header cylinder. Further, the ball valves and the pulse valves are connected to the discharge holes of the header cylinder, and therefore, the constitution of the header cylinder is very complicated, while inconveniences are encountered when the plurality of the valves are assembled to the header cylinder. Further, there are other difficulties in maintaining the constant pitches and the constant straightness. In manufacturing the dust collector, the pipes have to be procured, drilled and welded, and therefore, the labor costs are increased, while the manufacturing period is extended.
Further, in the case where the pulse valves are directly connected to the header cylinder, and the solenoid valves are directly connected to the pulse valves, the pressure loss becomes seriously large during the actuation of the valves. Further, the pressure loss is voluminous at the bent portions of the pipes. Further, the inlets and the outlets of the valves are same with each other in their cross sections, and therefore, the flow amounts are small, as well as reducing the flow coefficient. Consequently, the dust detaching efficiency is aggravated.
Further, the pipes are corroded by the internal moisture of the header cylinder, and the resultant rusts are introduced into the valves to clog the bleed holes, thereby causing malfunctions in the valves.
Further, the solenoid valves and the timers are separately provided, and therefore, the assembling becomes very difficult, with the result that the manufacturing cost increases and the manufacturing period is extended.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional techniques.
Therefore it is an object of the present invention to provide an apparatus for injecting a compressed air into a dust collector, in which an air header injects compressed air, and a control box controls the operation, the air header including an aluminum cylinder and a plurality of pulse valves, and the control box including a plurality of separately controlling type solenoid valves. Thus the constitution of the apparatus is simple, its assembling is easy, and the operation is stable.
In achieving the above object, the apparatus for injecting a compressed air into a dust collector in a direction opposite to the filtering direction so as to detach adhered dust particles according to the present invention includes: a dust collecting tank with a plurality of filtering cloths and a plurality of air injecting pipes installed therein; an air header secured to the outside of the dust collecting tank by means of fastening members; a plurality of air injecting pipes connected through connecting devices to a circumferential wall of a head cylinder of the air header; a plurality of pulse valves directly secured to another part of the circumferential wall of the header cylinder, for closing/opening a supply of a compressed air; a plurality of distribution tubes secured between the pulse valves and the connecting devices; a control box accommodating a printed circuit board of a control part; and a plurality of solenoid valves installed on the control box so as to be connected between the pulse valves and air hoses, for periodically actuating the pulse valves.
The header cylinder is extrusion-molded by using aluminum, and the cylindrical body of the header cylinder includes a plurality of reinforcing projections and flat parts (integrally formed together), while header covers are secured to both ends of the header cylinder.
The pulse valve includes: an inner body secured on the flat part of the header cylinder, with a round discharge part being supported by a plurality of ribs and provided at an intermediate part, and with a supply pressure chamber being provided therein; an outer body secured to the inner body, and having a discharge par
Roth & Goldman
Smith Duane S.
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