JPH05192521A - Method for connecting filter elements - Google Patents

Abstract

PURPOSE:To compactly arrange two or more sets of connected filter elements usable in a high temp. region by mating the flange-shaped end parts of cylindrical filter elements made of porous ceramics with each other to cover the same with a sleeve and pressing down the end parts by a packing presser. CONSTITUTION:Cylindrical filter elements are made of porous ceramics and the end parts of them are formed into a slight flange to be mated with each other. The joint thus formed is covered with a non-split sleeve 2 and the gaps between the outer surfaces of the cylindrical filter elements 1 and the surface of the sleeve 2 are packed with a dust sealing packing material and the end flange parts of the filter elements 1 are mutually pressed down by a packing presser 8 through spacer rings 4, 5. Finally, a guide 9 is provided to the outer periphery of the sleeve 2. The filter elements thus connected can be used in a high temp. region and become compact because the space is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting apparatus using a cylindrical filter element, and more particularly to a high temperature dust collecting porous ceramics filter element for a pressurized fluidized bed combustion furnace.

[0002]

2. Description of the Related Art In the conventional filter element connecting method, When the end of the filter element is straight.
(FIG. 3) As shown in FIG. 3, by inserting the end portion of the cylindrical filter element 12 into the filler box 11, filling the filler material 13 and tightening the filler retainer 14, the end portion of the filter element 12 is tightened. A surface pressure is generated on the circumference and the filling material 13 seals.

In this case, when the tensile force in the longitudinal direction acts on each of the filter elements 12 for some reason, the filter elements 12 due to the surface pressure of the filler 13 oppose each other while the frictional force is prevailing. When the tensile force exceeds that, both ends move within the filling material box 11, and the ends of the filling material box 11 fall out, impairing the original function of sealing.

2. When the end of the filter element has a flange shape. (FIGS. 4 and 5) When the end of the filter element 21 has a flange shape and has a jaw 21a, as shown in FIG. it can.

That is, the connection fittings 22 which are divided into two parts (total four parts) in the longitudinal direction and the axial direction of the filter element 21 according to the end flange shape of the filter element 21 are used.
Both ends of the filter element 21 are connected by tightening the flange 24 with bolts (not shown) via the filler 23 between the filter element 21 and the filter element 21.

[0006]

When the conventional filter element 12 has a straight end as shown in FIG. 3, there is no restraint against the movement of the filter element 12 in the axial direction. The part comes off, resulting in poor sealing. Even if the movement per movement is small, it is accumulated by repeating and the end part comes out.

In order to solve this dropout, as shown in FIG. 4, the end of the filter element 21 is formed into a flange shape,
The conventional connecting fitting 22 for suppressing the pulling movement of the filter elements 21 by using the jaw 21a is divided into two in the longitudinal direction and the axial direction (total of four divisions), and further, a flange 24 through which a bolt hole for fixing each is passed. Therefore, the diameter of the flange 24 becomes large.

If the diameter of the flange 24 becomes large, it is impossible to arrange the filter elements 21 with as small a gap as possible. Further, the space between the adjacent filter elements is also a space for dropping the dusts filtered by the filter, but if this is too occupied by the connecting fittings 22, the dust cannot be dropped effectively.

[0009]

DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned problems of the prior art. In the connection method for connecting cylindrical filter elements to each other in the longitudinal direction, the cylindrical filter elements are made of porous ceramics and the end portions are With a slight flange shape, the ends are face-to-face, the undivided sleeve is put over the connection part, and the filler material for dust seal is packed between the outer surface of the cylindrical filter element and the inside of the sleeve.
This is a filter element connection method in which the end flange portions of the cylindrical filter element are mutually suppressed by a packing ring and a spacer ring is used to provide a guide on the outer circumference of the sleeve.

[0010]

By tightening the packing retainer of the sleeve, the packing is compressed in the axial direction of the filter element and exerts a surface pressure on the circumferential surface to exert the sealing property at the end of the filter. Also, by axial tightening, both filter elements are connected via the jaws of the filter.

[0011]

FIG. 1 shows a first embodiment of the present invention. A cylindrical porous ceramic filter element 1 has a flange 1a at its end. Reference numeral 2 denotes a sleeve, one end jaw 2a of the sleeve 2 has an inner diameter larger than the outer diameter of the flange of the filter element 1, and the sleeve 2 can be inserted over the end portion of the filter element 1 without being divided into two in the longitudinal direction. . The outer diameter of the filter element 1 and the outer diameter of the filter element flange 1a are usually 10 mm or more.
Since there is a difference between the front and the rear, in order to hold the packing 3 directly in the jaw 2a of the sleeve 2, there is a large gap between the jaw 2a and the normal outer diameter of the filter element 1, and the packing 3 is pushed out. In order to prevent this, the spacer ring 4 whose inner diameter is slightly larger than the outer diameter of the filter element 1 is
Divide into pieces and put inside jaw 2. Spacer ring 4
Is supported by the jaw 2a of the sleeve 2 and is prevented from falling off.

After inserting the packing 3, the spacer ring 5 divided into two is put, and the cushion packing 6 is put on the spacer ring 5 connected to the filter element flange 1a.
Avoid direct contact between the spacer ring 5 and the flange 1a. (To prevent damage to ceramics due to direct contact between ceramics metals) Insert another end of the filter element 1 into the sleeve 2. In this case, another packing 7 is inserted in advance to prevent the end faces of the ceramic tubes from contacting each other.

Further, the flange 1a of the filter element 1
The cushion packing 6 is also inserted between the two-divided spacer ring 5 (upper stage), and the packing 3 is put on the spacer ring 5. The spacer ring 4 divided into two is further put on the packing 3, and the packing retainer 8 is screwed in through the spacer ring 4 and the packing 3 is tightened.

Reference numeral 9 denotes a guide. The sleeve 2 and the guide 9 are constrained in the radial direction of the cylindrical filter element 1, but have freedom of movement in the longitudinal direction to prevent lateral shake. Further, the filter element 1 is attached so as not to apply an unnecessary external force to the connecting portion of the filter element 1.

FIG. 2 shows a second embodiment of the present invention in which the packing retainer 8 can be tightened from both ends of the sleeve 2, and the sleeve 2 of FIG. 1 is 2 '(the jaw 2a disappears). 1 is the same as that of FIG. 1 except that it has the same operation and effect.

[0016]

EFFECTS OF THE INVENTION (1) The porous ceramics filter element of the present invention can be used in a high temperature range (200 ° C. to 900 ° C.) which cannot be used by the conventional filter element.

(2) Since there is no overhanging unlike the conventional flange 24 and it does not take up a lot of space, even when a plurality of sets of connected filter elements are arranged side by side, there is little interference between adjacent filter elements, so it is relatively compact. Can be placed. And so on.

[Brief description of drawings]

FIG. 1 is a vertical sectional view according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view according to a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional filter element connecting method in which the end portions of the filter element are straight.

FIG. 4 is a vertical cross-sectional view of a conventional filter element connecting method in the case where the end portion of the conventional filter element has a flange shape.

5 is a view taken along the line AA of FIG.

[Explanation of symbols]

 1 Filter element 1a Flange 2 Sleeve 2a Jaw 3 Packing 4,5 Spacer ring 6 Cushion packing 7 Packing 8 Packing retainer 9 Guide

Claims (1)

[Claims] 1. A connection method for connecting filter elements in a longitudinal direction, wherein the cylindrical filter element is made of porous ceramics, and the ends are slightly flanged so that the ends are face-to-face and an undivided sleeve. Over the connection portion, the filler for dust seal is packed between the outer surface of the cylindrical filter element and the inside of the sleeve, and the end flange portions of the cylindrical filter element are mutually pressed through a spacer ring by suppressing packing, A filter element connecting method, wherein a guide is provided on the outer circumference of the sleeve.