JP2002102660A - Pleated type cartridge filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pleated type cartridge filter durable to back washing and having an increased membrane surface area contributing to filtration. SOLUTION: A membrane 1 is pleated in the longitudinal direction, the pleated membrane 1 is installed along the outer circumference of an inner cylinder 2, and the joining margins are bonded to install the resulting unit in an outer cylinder 5. In that case, edge plates 3, 4 are attached to both edge faces of the unit in the height direction in the manner that the height of the pleats is at least one second of the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder and that the outer side end face of the pleats is curved relatively to the height direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pleated cartridge filter, and more particularly, to a pleated cartridge filter.
The present invention relates to a pleated cartridge filter having a structure capable of increasing the membrane area capable of contributing to filtration and enabling backwashing.

[0002]

2. Description of the Related Art Pleated cartridge filters are
A membrane made of a filtration membrane and at least one nonwoven fabric or net disposed on both sides of the filtration membrane is pleated in the length direction, and the pleated membrane is arranged on the outer peripheral surface of the inner cylinder. A cylindrical shape, seams are bonded and housed in an outer cylinder, and end plates are bonded to both end surfaces in the height direction. Filtering of cleaning liquid and etching liquid in the semiconductor industry where high filtration accuracy is required. Because it is often used for
A microfiltration membrane is used as the filtration membrane.

In such a pleated cartridge filter, when the membrane surface is clogged due to long-term use, if the backwash for removing the clogged substance is performed, the pleats lose their shape and cannot be used again. Therefore, it had been thrown away.

In the above-mentioned pleated cartridge filter, the outer dimensions such as the outer diameter and height of an outer cylinder for accommodating a pleated membrane in a cylindrical shape are standardized, and the filtration is performed without changing the outer dimensions. Because there is a limit in increasing the film area that can contribute to the problem, its use has been limited.

[0005]

The pleated cartridge filter described above is used disposably,
In addition to the problem that the running cost increases, there is a problem that it is not preferable in terms of waste disposal.

Further, as described in JP-A-8-503412, the above-mentioned pleated cartridge filter has a cylindrical membrane formed in an outer cylinder so that the gap between adjacent pleats is as small as possible. Although it can be stored, there is a problem that the limitation due to the thickness of the membrane cannot be overcome.

[0007]

According to a first aspect of the present invention, there is provided a membrane comprising a microfiltration membrane and at least one nonwoven fabric or net disposed on both sides of the microfiltration membrane. Is pleated in the length direction, and the pleated film body is arranged on the outer peripheral surface of the inner cylinder into a cylindrical shape, a seam is bonded and stored in the outer cylinder, and both ends in the height direction are attached to the outer cylinder. In the pleated cartridge filter to which the end plate is bonded, the cylindrical membrane has a height greater than the height of the outer cylinder, and the height of the pleats is equal to the inner diameter of the outer cylinder and the outer diameter of the inner cylinder. And the pleats are housed in the outer cylinder so that the outer end faces of the pleats are curved in the height direction. Increased membrane area that can contribute to filtration by overcoming body thickness limitations Rukoto can, can original shape by backwashing to withstand backwashing can be prevented, it is possible to reduce the deformation due to thermal expansion of the members constituting the filter be filtered hot stock.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 is a perspective view of a pleated cartridge filter according to an embodiment of the present invention, and FIG. 2 is a perspective view of a membrane used for the pleated cartridge filter.

The pleated cartridge filter shown in FIG. 1 is characterized in that the membrane 1 shown in FIG. 2 is pleated in the longitudinal direction, and the pleated membrane 1 is arranged on the outer peripheral surface of the inner cylinder 2. Into a cylindrical shape, the joints are bonded and housed in the outer cylinder 5, and the end plates 3 and 4 are bonded to both end surfaces in the height direction, and the height of the cylindrical film body 1 is adjusted. The pleats are housed in the outer cylinder 5 so as to be larger than the height of the outer cylinder 5 so that the outer end surface 6 of the pleats is curved in the height direction, whereby the height of the outer cylinder 5 and the height of the membrane 1 are reduced. Is to be the same.

Further, as shown in FIG.
It comprises a microfiltration membrane 10 and at least one nonwoven fabric 11a, 11b adhered to both sides of the microfiltration membrane 10. Then, after the pleating process is performed so that the height H of the pleat is equal to or more than half of the difference between the inner diameter R of the outer cylinder 6 and the outer diameter r of the inner cylinder 2, the pleated membrane 1 is removed from the inner cylinder 2. The end plates 3 and 4 are adhered to both end surfaces in the height direction, and the pleat height H is adjusted. When the difference between the inner diameter R of the outer cylinder 5 and the outer diameter r of the inner cylinder 2 is set to be equal to or more than half, and the outer cylinder 5 is screwed into the outer cylinder 5, the outer end face 6 of the pleat can be easily raised. It can be curved with respect to the direction. Note that a net made of a synthetic resin may be used instead of the nonwoven fabrics 11a and 11b.

As described above, the film body may be pleated, and a seam may be bonded and housed in the outer cylinder 5, but the pleated film body 1 may be arranged on the outer peripheral surface of the inner cylinder 2 to form a cylinder. It can also be housed in the outer cylinder 5 after being formed into a shape, bonding seams and twisting as shown in FIG. Also, on the inner wall of the outer cylinder 5,
The pleated film body 1 is arranged on the outer peripheral surface of the inner cylinder 2 to form a cylindrical shape, and the outer end surface 6 of the pleat can be curved in the height direction by inserting a joint having a seam bonded thereto. Irregularities may be provided.

In order to make the outer end face 6 of the pleat curved in the height direction as described above, the pleated film body 1 is arranged on the outer peripheral surface of the inner cylinder 2 to be cylindrical, and the joint is bonded. Even if the height of the product is larger than the height of the outer cylinder 5, by inserting the same into the outer cylinder 5, the height becomes the same as the height of the outer cylinder 5 and the storage density can be increased. This leads to an increase in the area of the membrane that can contribute to prevention of mold collapse and filtration.

Further, the membrane 1 comprises a microfiltration membrane 10,
On each side of this microfiltration membrane 10, one nonwoven fabric 11a,
11b, but a plurality of nonwoven fabrics 11a and 11b may be used in accordance with the strength of the film body 1.
It is optional to use a net made of a synthetic resin in place of a and 11b, and to form the microfiltration membrane 10 into a plurality of layers according to the accuracy of filtration.

Further, the height H of the pleat is determined by the inner diameter R of the outer cylinder 5.
And the difference between the outer diameter r of the inner cylinder 2 and the outer diameter r, but in order to achieve the object of the present invention, 0.5 m
It is preferable that the distance is about m or more.

The above-mentioned pleated film 1
Are arranged on the outer peripheral surface of the inner cylinder 2 to form a cylindrical shape, and the seams are bonded, and the end plates 3 and 4 are bonded to both end surfaces in the height direction of the film body 1 using an adhesive. Although good, heat welding, ultrasonic welding, and resin bonding may be used.

Further, the microfiltration membrane 10 and the nonwoven fabric 11
The material of a, 11b or the net can be arbitrarily determined depending on the stock solution to be filtered. That is, it is preferable to use a fluororesin for filtering a highly corrosive stock solution, and use a polypropylene resin for filtering a relatively corrosive stock solution.

[0018]

As described above, the pleated cartridge filter of the present invention is housed in the outer cylinder such that the outer end surface of the pleat is curved in the height direction, so that the membrane can contribute to filtration. The area can be increased and the density of the membrane body stored in the outer cylinder can be increased, preventing the mold from being lost due to backwashing and the thermal expansion of the components that make up the filter even when high-temperature stock solution is filtered. Deformation can be reduced, which can contribute to a reduction in running cost and a reduction in waste. Therefore, the pleated cartridge filter can be developed for applications that could not be applied due to the above-mentioned problems.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pleated cartridge filter according to an embodiment of the present invention.

FIG. 2 is a perspective view of a membrane used in the pleated cartridge filter.

FIG. 3 is a perspective view showing an example of processing a membrane used for the pleated cartridge filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Membrane body 2 Inner cylinder 3, 4 End plate 5 Outer cylinder

Claims (1)

[Claims] 1. A membrane comprising a microfiltration membrane and at least one nonwoven fabric or net disposed on both sides of the microfiltration membrane is pleated in a length direction, and the pleated membrane is formed into an inner cylinder. In the pleated cartridge filter, which is arranged on the outer peripheral surface of the cartridge, the joint is bonded and housed in the outer cylinder, and the end plates are bonded to both end surfaces in the height direction.
The cylindrical membrane, the height of which is greater than the height of the outer cylinder, the height of the pleats is equal to or greater than half the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder, A pleated cartridge filter characterized by being housed in an outer cylinder such that the outer end surface of the pleat is curved in the height direction.