JP2009214063A - Filter cartridge for pulse-jet type dust collector - Google Patents

Abstract

A filter for a pulse jet type dust collector capable of effectively transferring the air pressure of the filter body to the entire interior of the filter body to improve the effect of removing and reducing the reattachment of dust to the filter body. Provide a cartridge.
SOLUTION: A filter cartridge F used in a pulse jet type dust collector for discharging dust deposited and deposited on a filter body 1 by jetting a jet air flow for backwashing, wherein filtration surface portions 4a and 5a have upper end portions. The filter main body 1 which inclines toward the lower end 7 from 6, the upper cover 2 connected to the upper end of the filter main body 1 and having an opening 2 a, and the lower cover 3 connected to the lower end of the filter main body 1. ing.
[Selection] Figure 3

Description

  The present invention relates to a filter for a pulse jet dust collector. More specifically, the present invention relates to a filter cartridge for a pulse jet dust collector that effectively transmits the air to be removed to the entire inside of the filter body.

Conventionally, as a dust collector that uses a dust collection filter (filter cartridge), in order to maintain the dust collection performance, the dust (dust) that adheres and accumulates on the filter body (filter medium) as it is used is backwashed into the filter body. There is a pulse jet type dust collector which ejects a jet air flow for use and periodically wipes it out (see Patent Document 1).
In this dust collector, as shown in FIG. 6, a plurality of filter cartridges 101 are arranged in parallel. And, as a backwashing device for jetting a jet airflow (compressed air) for backwashing into the filter body 102, a plurality of blow tubes 103 arranged corresponding to the arrangement line of the filter body 102, An air supply source that supplies compressed gas to the blow tube 103 and a plurality of short tubes 104 provided in the blow tube 103 corresponding to the openings of the filter main bodies 102 are used. In FIG. 6, reference numeral 105 denotes a partition plate that divides the exhaust chamber 106 and the dust collection chamber 107 in which the blow tube 103 of the backwash device is disposed, reference numeral 108 denotes an upper cover having an opening, and reference numeral 109 denotes a lower cover. is there.
In addition, there is a dust collector that uses a damper that can be opened and closed in order to sequentially perform shifting-off for each filter that faces each duct corresponding to a short pipe (see Patent Document 2).

JP 7-16413 A JP 2002-282635 A

However, since the filter main body 102 of the conventional filter cartridge 101 has a cylindrical shape in which the filtration surface 102a is manufactured vertically, the upper end portion 110a and the lower end portion 110b of the filter main body 102 have the same shape. Even if compressed air is jetted into the filter main body, the airflow pressure decreases as it goes to the lower end, so that there is a problem in that the entire filter main body 102 does not have a clearing effect. The larger the internal volume, the more air that needs to be removed.
When the filters are arranged close to each other, as shown in FIG. 7, for example, compressed air 111 is sprayed onto one filter body 102, and dust 112 separated by solid-gas separation is adjoined by a dust-containing gas 113. It may be sucked into the main body 102 and attached again. This is because even when the filter main bodies 102 are wiped off at the same time, the dust 112 is not easily discharged from the space between the filters to the outside, so that the dust may reattach to the adjacent filter main bodies 102.

  Therefore, in view of the above circumstances, the present invention effectively transmits the air pressure of the filter body to the entire inside of the filter body to improve the effect of the removal, and reduces the reattachment of dust to the filter body. An object of the present invention is to provide a filter cartridge for a pulse jet dust collector that can be used.

  A filter cartridge for a pulse jet dust collector according to the present invention is a filter cartridge used in a pulse jet dust collector that discharges dust by adhering and accumulating dust adhering to a filter body by ejecting a jet air flow for backwashing. Comprising a filter main body inclined from the upper end portion toward the lower end portion, an upper cover connected to the upper end of the filter main body and having an opening, and a lower cover connected to the lower end of the filter main body. It is said.

According to the present invention, the inner surface of the filter body is smaller than the filter body having the same shape from the upper end portion to the lower end portion by inclining the filtration surface portion of the filter body from the upper end portion toward the lower end portion. The dropping air pressure can be effectively transmitted to the entire inside of the filter main body without decreasing the dropping air pressure, and the dropping effect can be improved.
In addition, by tilting the filtration surface of the filter body, the gap between the lower ends of the filter bodies installed side by side becomes larger, the speed and pressure loss of the fluid flowing therethrough is reduced, and the filter body of dust that has been removed It is possible to reduce the re-adhesion to the filtration surface portion.

Hereinafter, a filter cartridge for a pulse jet dust collector of the present invention (hereinafter simply referred to as a filter cartridge) will be described with reference to the accompanying drawings.
The filter cartridge of the present invention is used in a pulse jet dust collector that jets a jet stream (compressed air) into the inside of a filter body by a backwash device, and deposits and accumulates solidified dust deposited on the filter surface of the filter body. .
As shown in FIGS. 1 to 3, a filter cartridge F according to an embodiment of the present invention includes a filter body 1, an upper cover 2 that is connected to the upper end of the filter body 1 and has an opening 2 a, The flat filter cartridge is provided with a bottomed bottom cover 3 connected to the lower end of the filter body 1.
The filter body 1 is composed of a pair of filters. That is, it is the structure which has arrange | positioned the sheet-like filters 4 and 5 which folded the filter cloth of the material polyester in the shape of a pleat so as to oppose. The pair of filters 4, 5 are inclined by angles θ 1, θ 2 so that the filtration surface portions 4 a, 5 a approach each other from the upper end 6 toward the lower end 7. The cross-sectional area (S1) is arranged to be smaller than the dimension (cross-sectional area) S2 of the drop-off port 8. The inclination angles θ1 and θ2 are appropriately selected according to the length of the filter cloth, the shape of the upper portion, the shape of the filter cloth, and the like, and can be the same or different angles. For example, when the sheet-like filters 4 and 5 have a shape in which a mountain span and a valley fold are repeated at intervals of 40 mm for a polyester spun pond (filter cloth) having a width of 415 mm and a length of 34.8 m, the inclination angle θ1, θ2 can be about 1.55 °.
In FIG. 3, reference numeral 9 denotes an end of the filter. The filters 4 and 5 and the upper cover 2 and the lower cover 3 are joined with an adhesive, respectively. In addition, in FIG. 3, the code | symbol 10 is an upper end junction part and the code | symbol 11 is a lower end junction part.

  As shown in FIG. 4, the filter cartridge F in the present embodiment has a predetermined number of holes in the mounting holes of the partition plate 23 that partitions the exhaust chamber 21 and the dust collection chamber 22 where the backwash device of the pulse jet dust collector is arranged. (Three in this embodiment) are detachably suspended. A cleaning jet airflow (compressed air) J injected from the injection port 25 of the manifold 24 of the backwashing device flows into the filter body 1.

In the present embodiment, the pair of filters 4 and 5 are inclined so that the dimension (cross-sectional area) S1 inside the lower end is made smaller than the dimension (cross-sectional area) S2 of the drop-off port 8, thereby making it more than the conventional cylindrical filter. Since the volume inside the filter is reduced and the volume inside the filter body 1 is reduced, the air pressure can be effectively transmitted to the entire inside of the filter body 1 without reducing the air pressure. Can be improved.
Further, when a plurality of filter cartridges F are arranged in parallel, the gap between the lower end portions 7 of the filter body 1 is increased, and the pressure loss of the fluid (dust-containing air) 31 flowing through the gap is reduced, and the dust 32 that has been removed is removed. Adhesion to the adjacent filter body 1 can be reduced.

Note that the filter cartridge of the present invention is not limited to the filter cartridge F in the above-described embodiment, and as shown in FIG. 5, the filter main body in which the filtration surface portion 51 is inclined from the upper end portion toward the lower end portion. 52 can be a conical filter cartridge F1 made of a truncated cone filter. In the case of this filter main body 52, the opposing filtration surface part 51 is an entire peripheral part.
The filter main body 52 can be appropriately provided with, for example, a cage (holding frame) for holding the filter in an expanded state therein, a venturi tube attached to the upper end portion, and the like.

It is a figure explaining the filter cartridge for pulse jet type dust collectors concerning one embodiment of the present invention. It is a side view of the filter cartridge of FIG. It is the II sectional view taken on the line of FIG. FIG. 2 is a diagram illustrating a state where the filter cartridge of FIG. 1 is being removed. It is a figure explaining the filter cartridge for pulse jet type dust collectors concerning other embodiment of this invention. It is a figure explaining the filter cartridge using the conventional cylindrical filter main body. FIG. 7 is a diagram illustrating a state where the filter cartridge of FIG. 6 is being removed.

Explanation of symbols

F, F1 Filter cartridge 1, 52 Filter body 2 Upper cover 2a Opening part 3 Lower cover 4, 5 Filter 4a, 5a, 51 Filtration surface part 6 Upper end part 7 Lower end part 8 Discharge port

Claims (3)

A filter cartridge used in a pulse jet dust collector that discharges dust by adhering and accumulating on a filter body by jetting a jet stream for backwashing,
A filter body in which the filtration surface portion is inclined from the upper end portion toward the lower end portion;
An upper cover connected to the upper end of the filter body and having an opening;
A filter cartridge for a pulse jet dust collector, comprising a lower cover coupled to the lower end of the filter body. 2. The filter cartridge for a pulse jet dust collector according to claim 1, wherein the filter main body is arranged in a V shape so as to face a sheet filter in which a filter cloth is folded in a pleat shape. 2. The filter cartridge for a pulse jet dust collector according to claim 1, wherein the filter body is formed of a truncated cone filter.