JPH07241424A - Backward washing device for dust collector - Google Patents

Abstract

PURPOSE:To surely and momentarily turn on and off a backward washing nozzle, to surely perform backward washing, to transmit a pressure of backward, washing gas to the backward washing nozzle without pressure loss and to enhance the jetting velocity, in a backward, washing device for a dust collector. CONSTITUTION:Plural backward washing nozzles 3 as filter-elements are formed on a header pipe 7 supplied with the backward, washing gas, and a connecting rod 8 actuating a nozzle stopper 3 to turn on and off the backward washing nozzle 3 is arranged in the header pipe 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwashing device for a dust collector used for pulse backwashing of filter elements such as bag filters and ceramic filters suitable for precision dust collection.

[0002]

2. Description of the Related Art Conventionally, as a means for removing dust accumulated on a filter of a dust collector, a backwash gas is instantly ejected from a nozzle provided at each filter element outlet to impactly reverse pressure to remove the dust. There is a pulse backwash device.

An example of this conventional pulse backwash device is shown in FIG.
Shown in. In the casing 1 of the dust collector, a plurality of filter elements 2 are arranged via a partition plate 2 '. A single conduit 6 is arranged in the immediate vicinity of the outlet side of the filter element 2, and a plurality of backwash nozzles 3 are provided in the conduit 6 at positions corresponding to the respective filter elements 2. The conduit 6 is connected to a buffer tank 5 outside the casing 1 through a backwash valve 4 which is an electromagnetic valve and is provided outside the casing 1. A backwash gas supply pipe 19 is connected to the buffer tank 5. Backwash gas such as high-pressure air is stored in the buffer tank 5.

In this apparatus, by opening and closing the backwash valve 4, the high-pressure backwash gas in the buffer tank 5 is jetted from the backwash nozzle 3 toward each filter element 2 to backwash the filter element. .

[0005]

In a filter dust collector using a bag filter or the like, a pulse jet backwashing method is recommended, in which the backwashing is instantly completed in order to remove dust accumulated on the filtration surface. The backwashing device as shown in FIG. 4 is used. However, in this backwashing apparatus, as described above, the electromagnetically operated backwashing valve is usually used as described above, and such a type of backwashing valve is collected as described above because of problems such as heat resistance. It is installed outside the casing of the dust collector, and as described above, a backwash gas buffer tank is provided at the base side of this backwash valve and a conduit is provided at the wake side,
A backwash nozzle corresponding to the filter element was provided at a predetermined position of the conduit.

According to this apparatus, even if high-pressure backwash gas is stored in the backwash gas buffer tank, the length of the conduit from the backwash valve to the backwash nozzle becomes long, and the backwash valve after the backwash valve is activated. Due to the flow of the backwash gas ejected from the nozzle, a pressure loss occurs in the conduit on the way, and the pressure in the buffer tank cannot be effectively transmitted to the backwash nozzle.

Further, as the number of filter elements in the dust collector casing increases and the number of filter elements handled by one backwash valve increases, it is necessary to increase the backwash flow rate and increase the buffer tank capacity. Sometimes this increases the pressure drop in the conduit and the backwash valve. In order to reduce this pressure loss, the pipe and the backwash valve must have a large diameter, so the pipe capacity increases, and even if the backwash valve is suddenly opened, the backwash gas in the backwash nozzle will be affected by the buffer effect of the pipe. The instantaneous injection becomes slow and wasteful backwash gas flows. In addition, an increase in the size of the backwash valve results in slowing the instantaneous opening / closing operation.

Therefore, a conventional backwash valve as shown in FIG.
It is difficult to increase the size of the pulse jet backwash device by combining the arrangement of the buffer tank and the conduit.

Further, in recent years, dust collectors using porous ceramics filters have been widely applied, and particularly in so-called ceramic honeycomb filters in which both ends of a lattice passage are alternately plugged, the filtration area per volume is Many,
In other words, because of the compactness, the number of filter elements can be greatly reduced for the same amount of processing gas, cost can be reduced, and the entire device can be greatly reduced. Is coming off.

However, when such honeycomb filter elements are stacked and arranged in order to increase the capacity, the backwashing gas flow rate at the time of backwashing increases because the filtration area per filter element is large. As described above, when a large number of these elements are bundled and controlled by a batch external backwash valve, the pressure loss in the middle is increased, the size of the pipe is increased, and the valve diameter is increased, so that a predetermined effect cannot be obtained.

Therefore, it is conceivable to install a backwash valve, a conduit and a buffer tank separately for each small number of elements, but in this case, if the processing gas capacity becomes large, the number of a series of devices such as the backwash valve and the buffer tank will increase. It becomes enormous and the cost increases.

The present invention is intended to provide a backwash device for a dust collector which can solve the above problems.

[0013]

[Means for Solving the Problems]

(1) The present invention relates to a backwash device for a dust collector in which a backwash nozzle for a filter element is provided on the outlet side of each of a plurality of filter elements, and each header pipe to which backwash gas is supplied is provided with a nozzle plug. A plurality of backwash nozzles that are opened and closed are arranged, and a connecting rod that is arranged in the header pipe and is driven from the outside to open and close the plurality of nozzle plugs is provided. (2) In the present invention according to (1), a link mechanism driven by the connecting rod is provided between the nozzle plug and the connecting rod, and the nozzle plug is attached to the link mechanism in the closing direction. A spring for urging is provided.

[0014]

In the present invention of the above (1), by driving the connecting rod, each nozzle plug of the backwash nozzles of the plurality of filter elements is opened, and the backwash gas is ejected from the header pipe through the backwash nozzle. The filter element is backwashed, and when the backwashing is finished, the nozzle plug of each backwash nozzle is closed. In this way, since the nozzle plug of the backwash valve is opened and closed by the connecting rod, the nozzle plug is opened and closed instantly and reliably. Also, since the backwash gas is ejected from the header pipe through the backwash nozzle arranged in the header pipe,
The pressure of the backwash gas in the header pipe is effectively transmitted to each backwash nozzle without pressure loss.

In the present invention (2), the nozzle plug is opened by the connecting rod against the force of the spring. When backwashing is completed and the opened nozzle plug is closed, it is quickly closed by the force of the spring, and when backwashing is not performed, the nozzle plug is biased to the closing side by the force of the spring. Therefore, the backwash nozzle is quickly closed when the backwash is finished, and when the backwash is not performed, the nozzle plug is securely held at the position where the backwash nozzle is closed, and unnecessary spouting of the backwash gas is prevented. To be done.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a plurality of filter elements such as a bag filter and a ceramics filter, which are arranged by being partitioned by a partition plate 2'in the casing 1 of the dust collector, and on the outlet side above the filter element 2 in the casing 1, A header tube 7 supported by a connecting rod guide 20 is arranged across the casing 1. A backwash nozzle 3 is provided at a position of the header pipe 7 in the vicinity of the outlet of each filter element 2. Header tube 7
A supply pipe 19 for supplying a high-pressure backwash gas such as air from the outside of the casing 1 is connected to the. In the header pipe 7, one connecting rod 8 is arranged in the axial direction, and the connecting rod 8 extends outside the casing 1 and is shown by an arrow in FIG. 1 by an air cylinder 18 arranged outside the casing 1. It can be moved in the axial direction.

Each backwash nozzle 3 has a built-in nozzle plug 9 for opening and closing the backwash nozzle 3, and a plug pull-up rod 11 continuously provided above the nozzle plug 9 is provided in the backwash nozzle 9 and is provided with a guide 1.
It extends through 0 and its upper end is located in the header tube 7. A vertical drive lever 16 and a horizontal lift lever 12, which form an L-shaped link mechanism, are provided corresponding to each backwash nozzle 3, and one end of each of them is attached to a fulcrum 14 attached to the header pipe 7. It is pivotally attached to the other end of the lift lever 12 and has a horizontal engaging hole 12
a is formed, and the tip of the plug pulling rod 11 is engaged with this engaging hole 12a so that it can slide. Further, a leaf spring 13 is arranged around the fulcrum 14, the tip of which is fixed to the drive lever 16 and the lift lever 12, and the leaf spring 13 for urging the lift lever 12 toward the nozzle plug 9 is provided. Further, the connecting rod 8 is provided with a plurality of triggers 15 projecting from the connecting rod 8 that can engage with a plurality of drive levers 16 provided corresponding to the respective backwash nozzles 3.

Numeral 17 is an O-ring for sealing between the connecting rod 8 and the casing 1, and the contact surface A between the backwash nozzle 3 and the nozzle plug 9 is a sealing surface for high pressure in the header pipe 7. The backwash gas leakage is prevented, and a rubber O-ring or a metal O-ring is used for the contact surface A depending on the gas atmosphere.

In this embodiment constructed as described above, when backwashing is not performed, the nozzle plug 9 is at the position shown in FIG. 1 and the backwash nozzle 3 is closed. At this time,
The leaf spring 13 holds the lift lever 12 via the plug pulling rod 11 at a position where the nozzle plug 9 is seated on the backwash nozzle 3.
Leakage of high-pressure backwash gas in the header pipe 7 is prevented.

When performing backwashing, the air cylinder 1
1 drives the connecting rod 8 to the left in FIGS. 1 and 2, the trigger 15 of the connecting rod 8 engages with the drive lever 16, and the drive lever 16 rotates counterclockwise around the fulcrum 14. Along with this, the drive lever 1 via the spring 13
The lift lever 12 connected to 6 also rotates counterclockwise around the fulcrum 14, and the nozzle plug 9
And the backwash nozzle 3 is opened, high-pressure backwash gas in the header pipe 7 is ejected from the backwash gas 3, and the filter element 2 is backwashed.

As described above, the nozzle plugs 9 of the plurality of backwash nozzles 3 are moved simultaneously by the movement of one connecting rod 9, and
It is opened instantaneously and the backwashing gas is ejected from the backwashing nozzle 3 to ensure the backwashing. Further, since the high-pressure backwash gas stored in the header pipe 7 from the supply pipe 19 is ejected from the backwash nozzle 3 provided in the header pipe 7, no pressure loss occurs, and The pressure can be effectively transmitted to the backwash nozzle 3 to increase the ejection speed.

When the connecting rod 8 is further moved to the left, the engagement between the trigger 15 and the drive lever 16 is released, the drive lever 16 and the lift lever 12 are returned to the position shown in FIG. Comes into contact with the backwash nozzle 3, the backwash nozzle 3 is closed, and the ejection of the backwash gas ends. The return of each member to the position shown in FIG. 1 is performed by the force of the spring 13, and the backwash nozzle 3 can be closed quickly.

Thereafter, the connecting rod 8 is connected to the air cylinder 18
1 and 2 to the right,
Return to the position indicated by and prepare for the next backwash. At this time, the trigger 15 resists the spring 13 and drives the lever 16
Can be rotated clockwise to move the connecting rod 8 to the right without any hindrance.

The second embodiment of the present invention will be described with reference to FIG. In this embodiment, the connecting rod guide 20 in the first embodiment is provided in the middle of the adjacent backwash nozzles 3, 3.
The connecting rod guide 20 is used as a partition for partitioning the header pipe 7,
A plurality of chambers 21 defined by the connecting rod guides 20 and serving as a buffer capacity are provided in the header pipe 7 corresponding to the respective backwash nozzles 3. Further, the supply pipe 19 is communicated with the inside of the connecting rod 8 outside the casing 1, and the connecting rod 8 is hollow to form a backwash gas conduit. Further, a communication hole (not shown) is provided in a portion of each chamber 21 of the connecting rod 8 defined by the connecting rod guide 20 so that the backwash gas can be supplied into each chamber 21 regardless of the movement of the connecting rod 8. ing.

Also in this embodiment, the same operation and effect as those of the first embodiment can be obtained.

In the first and second embodiments, a coil spring or the like can be provided between the guide 10 and the nozzle plug 9 in order to ensure the return operation of the nozzle plug 9. Further, in the first and second embodiments, the trigger 15 of the connecting rod 8 is engaged with the drive lever 16 to open the nozzle plug 3, and when the trigger 15 is disengaged from the drive lever 16, the nozzle plug 3 is opened by the spring 13. Although it is closed, in the present invention, the drive lever 16 is attached to the connecting rod 8,
It is also possible to open and close the nozzle plug 9 by the left and right movements of the connecting rod 8.

[0027]

According to the present invention, the backwash nozzle provided on the outlet side of each filter element is arranged in the header pipe to which the backwash gas is supplied, and the nozzle plug for opening and closing the backwash nozzle is provided in the header pipe. Since the plurality of nozzle plugs are simultaneously operated by opening and closing the backwashing nozzles simultaneously, the backwashing gas can be surely ejected from the backwashing nozzles. Moreover, since the multiple backwash nozzles are installed in the header pipe to which the backwash gas is supplied, pressure loss does not occur and the backwash gas pressure is effectively transmitted to the backwash nozzle, and the backwash gas ejection speed is increased. Can be increased to effect effective backwash.

Further, according to the present invention, since the connecting rod and the nozzle plug are connected to each other by the link mechanism and the link mechanism is provided with the spring for urging the nozzle plug toward the closing side, the nozzle is not used when backwashing is performed. It is possible to prevent the backwash gas from leaking by reliably holding the plug in the closed position, and to open and close the backwash nozzle quickly and reliably.

[Brief description of drawings]

FIG. 1 is a detailed view of the first embodiment of the present invention.

FIG. 2 is an overall view of the same embodiment.

FIG. 3 is an overall view of a second embodiment of the present invention.

FIG. 4 is an overall view of an example of a conventional backwash device for a dust collector.

[Explanation of symbols]

 1 casing 2 filter element 2'partition plate 3 backwash nozzle 4 backwash valve 5 buffer tank 6 conduit 7 header pipe 8 connecting rod 9 nozzle plug 10 guide 11 plug pulling rod 12 lift lever 13 leaf spring 14 fulcrum 15 trigger 16 drive lever 18 air cylinder 19 supply pipe 20 connecting rod guide 21 chamber

Claims (2)

[Claims] 1. A backwash device for a dust collector in which a backwash nozzle for the filter element is provided on the outlet side of each of the plurality of filter elements, wherein each header pipe to which the backwash gas is supplied is opened and closed by a nozzle plug. A backwash device for a dust collector, wherein a plurality of backwash nozzles are arranged, and a connecting rod that is arranged in the header pipe and is actuated from the outside to operate the plurality of nozzle plugs is provided. 2. A link mechanism is provided between the nozzle plug and the connecting rod to open and close the nozzle plug by being driven by the connecting rod, and the link mechanism is provided with a spring for urging the nozzle plug toward the closing side. The backwash device for a dust collector according to claim 1.