JPH0490817A - Method for preventing retro-ejection of dust in filtering type dust collecting equipment - Google Patents

Abstract

PURPOSE:To prevent the retro-ejection of dust at the time of the operation of a backwashing apparatus by ejecting high pressure air to the back flow of dust-containing air generated in the side flow path of a suction port when backwashing high pressure air is ejected. CONSTITUTION:To a filtering type dust collector 1 wherein the dust-containing air 32 sucked from a suction port 12 through the duct 3 arranged up to a dust generating source 30 is filtered by a filter 10, a backwashing apparatus 2 shaking down the dust bonded to the filter 10 by ejecting the high pressure air of an air tank 20 to the filter 10 on the downstream side of the filter 10 for a short time is provided. The high pressure air 40 from an opposed nozzle 4 is ejected to the back flow of the dust-containing air 32 generated in the side flow path of the suction port 12 when said backwashing high pressure air is ejected. As a result, the retro-ejection of the dust-containing air from the seam of a duct or a dust collecting hood can be prevented and environmental pollution or the trouble of a worker in work can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for preventing backspray of dust in a filtration type dust collection equipment equipped with a backwashing device.

(Prior Art) Conventionally, a dust collector having a structure in which dust-containing air collected by a dust collection hood or the like is sucked and filtered by a filter is equipped with a backwashing device to prevent the filter from clogging. That is, high-pressure air is instantaneously injected into the inside of the filter during dust collection through a venturi nozzle to deform the filter, thereby exfoliating the dust adhering to the filter.

(Problem to be Solved by the Invention) However, in this conventional method, a large amount of air is blown in by the ejector effect of the Venturi nozzle and the filter expands instantaneously. A shock like that ran through me,
There was a problem in that the shock waves propagated to the duct side caused dust-containing air to leak from the duct joints or blow out from the dust collection hood.

The present invention has been made to solve these conventional problems, and its purpose is to provide a method for preventing back-spraying of dust during operation of a backwashing device.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a method for preventing back-spraying of dust in a filtration type dust collection equipment of the present invention provides a method for preventing back-spraying of dust in a filtration type dust collection equipment of the present invention. In a filtration type dust collection equipment that is equipped with a filtration type dust collector that filters air through a filter, and a backwashing device that blows off dust attached to the filter by injecting high-pressure air from the downstream side of the filter for a short time, the backwashing device We adopted a method in which high-pressure air is injected in the opposite direction to the backflow of dust-containing air that occurs in the suction port side flow path when high-pressure air is injected.

(Function) In the present invention, high-pressure air is injected in the suction port side flow path of the filtration type dust collector in opposition to the backflow of dust-containing air. The progress of this dust-containing air can be stopped when it collides with dusty air. Therefore, if the collision location is set in the lower dust collection chamber or near the suction port and the timing of the high-pressure air injected into the flow path is timed, dust-containing air will not be injected back from the duct joint or dust collection hood. .

(Example) Embodiments of the present invention will be described in detail below based on the drawings.

First, the configuration of the embodiment will be explained.

As shown in FIG. 1, the filtration type dust collection equipment A of this embodiment mainly includes a filtration type dust collector 1, a backwashing device 2, a duct 3, a facing nozzle 4, and a facing solenoid valve 5. The structure is as follows.

The filtration type dust collector 1 filters dust-containing air by passing it through a filter, and has a lower dust collection chamber 11 equipped with a plurality of filter cloths 10 formed in the shape of a cylinder with a bottom as a filter. A suction port 12 is provided above the room. Further, an upper suction chamber 13 is provided above the lower dust collection chamber 11, and the upper end opening 14 of the filter cloth 10 communicates with the upper suction chamber 13. In the figure, reference numeral 15 denotes a communication port opened on one side of the upper suction chamber 13, which communicates with an external blower (not shown). Further, in the figure, reference numeral 16 denotes a venturi nozzle, which is provided at each upper end opening of the filter cloth 10.

The front backwashing equipment 2 backwashes each filter cloth 10 one after another during continuous dust collection, and one side is connected to an externally provided air tank 20 via a solenoid valve 21. The other side is the upper end opening 1 of the filter cloth 10 in the upper suction chamber 13.
4, an air pipe 22 extending upwardly, and a backwash nozzle 23 attached to the air pipe 22 toward the upper end opening 14 of the filter cloth 10.

The duct 3 is extended to a dust collection hood 31 attached to a crusher 30, which is a dust generation source, and serves as a flow path for collected dust-containing air 32. It is clean air. The facing nozzle 4
is for injecting high-pressure air 40 in the direction of flow of the dust-containing air 32, and the suction port 12 provided in the lower dust collection chamber 11
It is placed in a nearby duct 3 and fixed toward the suction port 12. Further, this nozzle 4 is communicated with the air tank 20 through a pipe 41.

The opposing solenoid valve 5 is attached to the piping 41 and supplies high pressure air from the air tank 20 to the nozzle 4 at a predetermined time for a predetermined period of time. The opposing solenoid valve 5 is connected to a control panel (not shown) that controls the solenoid valve 21 of the backwashing device 2.
The solenoid valve 21 is connected to operate simultaneously with the solenoid valve 21.

Next, the operation of the embodiment will be explained.

The filtration type dust collector 1 collects dust-containing air 32 generated from the crusher 30 in the dust collection hood 31 by the suction force of an external blower.
The dust-containing air 32 is sucked and introduced into the lower dust collection chamber 11 from the suction port 12 via the duct 3, and in the lower dust collection chamber 11, the dust-containing air 32 is passed through the filter cloth 10 and sucked into the upper suction chamber 13. The dust in the dust air 32 is adsorbed onto the filter cloth 10 to create clean air 3.
It is discharged at 2a.

During continuous filtration of the filter cloth 1O, the solenoid valve 21 of the backwashing device 2 is operated one after another for a short time at predetermined intervals according to a command from the control panel, so that the air pipe 2 is connected to the air tank 20.
High pressure air is supplied to each filter cloth 1 from the backwash nozzle 23.
High pressure air is injected one after another toward the upper end opening 14 of 0. Further, at this time, the facing solenoid valve 5 is also connected to the solenoid valve 21.
, and injects high-pressure air from the opposing nozzle 4 toward the suction port 12 in the duct 3 by a fraction of the amount of injection from the backwash nozzle 23.

When the high-pressure air is instantaneously injected toward the upper end opening 14 of the filter cloth 10, the venturi nozzle 16 causes an amount of air several times the high-pressure air to rush into the filter cloth 1o.
expands instantaneously and dust is blown away. This filter cloth 10
As the dust expands instantaneously and its volume increases, an abnormal pressure similar to that of a water hammer is generated in the lower dust collection chamber 11, which propagates as a shock wave toward the suction port 12, but the dust is injected from the opposing nozzle hole. Its progress is stopped when it collides with high-pressure air. The amount of high-pressure air to be injected may be smaller than the amount of high-pressure air to be injected to the filter cloth 1o in order to counteract the shock waves that have progressed while attenuating in opposition to the progress of the dust-containing air.

As explained above, the lower dust collection chamber 1 of the filtration type dust collector 1
The abnormal pressure generated in 1 cannot be propagated through the duct 3 by the high-pressure air injected in the opposite direction, and dust-containing air cannot be injected from the joint of the duct or the dust collection hood 31.

Although the present invention has been described in detail above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change within the scope of the invention, it is included in the present invention. .

For example, in the embodiment, the facing nozzle 4 is the lower dust collection chamber 11.
Although the installation is not limited to this, it may also be installed in the lower dust collection chamber or near the junction of each dust collection hood and the duct.In the latter case, the solenoid valve The activation timing will be adjusted using a timer.

Furthermore, although the air source for the opposing nozzle 4 is connected to the air tank 20 of the backwash nozzle 23, the air source is not limited to this, and may be supplied from another air tank or air piping within the factory.

Further, the specific configuration of the filtering type dust collector is also arbitrary.

(Effects of the Invention) As explained above, in the method for preventing back-splash of dust in the filter-type dust collection equipment of the present invention, dust particles generated in the flow path on the suction port side when high-pressure air for backwashing is injected By adopting a method of injecting high-pressure air in the opposite direction to the backflow of air, it is possible to prevent back-injection of dust-laden air from duct joints and dust collection hoods, thereby preventing environmental pollution and reducing worker work. This has the effect of eliminating the above obstacles.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a filtration type dust collection equipment according to an embodiment of the present invention. 30: Crusher (dust source) 32: Dust-containing air 40: High-pressure air

Claims (1)

[Scope of Claims] 1) In a filtration type dust collector that filters dust-containing air sucked from a suction port through a duct extending to a dust source, high-pressure air is injected into the filter from the downstream side for a short period of time. In a filtration type dust collection equipment equipped with a backwashing device that brushes off the dust that has adhered to the backwashing device, high-pressure air is injected in a direction opposite to the backflow of dust-containing air that occurs in the flow path on the suction port side when the high-pressure air for backwashing is injected. A method for preventing back-splash of dust in a filtration type dust collection equipment, characterized in that: