JPH05192541A - Filter module - Google Patents

Abstract

PURPOSE:To easily release and remove the cake layer in a filter membrane cylinder and to improve filtering capacity by providing piezoelectric elements to both end parts of the filter membrane cylinder of a filter module or both end parts of a cylindrical housing to vibrate the filter membrane cylinder. CONSTITUTION:A filter module 1 is constituted by inserting a filter membrane cylinder 3 having piezoelectric elements 2, 2 provided to both end parts thereof in a cylindrical housing 4. A raw solution is filtered during the passage through the filter membrane cylinder 3 to flow out of an emitting port 6b but a cake layer is formed on the inner surface of the filter membrane cylinder 3. When the piezoelectric elements 2 are connected to an AC power supply at this time, the filter membrane cylinder 3 is vibrated and the cake layer is released to be washed away by the raw solution. Therefore, the passage area of raw water of the filter module is kept proper to improve filtering capacity.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to improvements in filtration modules.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view of a conventional filtration module. The filtration module 100 comprises a cylindrical housing 102 containing a filtration membrane cylinder 101 made of porous ceramics or the like. And a part thereof passes through while being filtered by the filtration membrane cylinder 101 (arrow),
Through the inner surface of the cylindrical housing 102 (arrow,),
It flows out from the discharge port 103 (arrow,).

[0003]

It is well known that the cake (solid matter) contained in the undiluted solution is deposited on the inner surface of the filtration membrane cylinder 101 during the filtration indicated by the arrow. When this cake layer increases, the permeation resistance of filtered water increases,
Filtration efficiency decreases.

Therefore, conventionally, the cake layer is removed by backwashing or changing the flow rate of the stock solution, but there are disadvantages such as insufficient removal and a complicated filtering device.

[0005]

According to the present invention, in order to solve the above-mentioned inconvenience, piezoelectric elements are attached to both ends of a filtration membrane cylinder or both ends of a cylindrical housing of a filtration module. Alternatively, a piezoelectric element is attached to one end of the filtration membrane cylinder or the tubular housing, and a vibration absorbing material is provided on the other end of the filtration membrane cylinder or the tubular housing.

[0006]

The piezoelectric element is energized to continuously or intermittently vibrate the filtration membrane cylinder or the cylindrical housing to separate the cake layer.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of a filtration module according to the present invention. The filtration module 1 comprises a tubular housing 4 containing a filtration membrane tube 3 having piezoelectric elements 2 and 2 attached to both ends thereof.

More specifically, the tubular housing 4 has thick sockets 6 and 6 screwed or welded to both ends of the pipe 5, and tapered surfaces 6a and 6a are formed at the outer ends of the sockets 6 and 6, respectively. The rubber rings 7, 7 are inserted, and these are compressed by the union fittings 8, 8 and the union nuts 9, 9.

Therefore, the filtration membrane cylinder 3 has the left socket 6,
The pipe 5 is inserted into the socket 6 on the right side, the rubber rings 7, 7 are hung on both ends, and then the union nuts 9, 9 are rotated to be held in place by the compressed rubber rings 7, 7. It In the figure, 6b is a discharge port.

FIG. 2 is a diagram showing another embodiment of the filtration module according to the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and their description will be omitted. This filtration module 1 has a cylindrical housing 4
The piezoelectric elements 2 are attached to both ends of the.

The operation of the filtration module having the above structure will be described below. In FIG. 1, a part of the stock solution that has flowed in the direction of the arrow is filtered while passing through the filtration membrane cylinder 3 (arrow) and flows out from the discharge port 6b (arrow).

During this time, a cake layer is formed on the inner surface of the filtration membrane cylinder 3, but since the filtration module of the present invention is provided with a piezoelectric element, these may be operated in the following manner.

FIG. 3 is a diagram showing the operating principle of the piezoelectric element of the filtration module of the present invention. The piezoelectric element 2 on the right side of the drawing is connected to the lead wire 1.
It is connected to the AC power supply 11 via 0 and 10.

When the piezoelectric element 2 on the right side of the drawing is energized and its vibration is started, the traveling wave 12 of vibration advances in the direction of the arrow. At this time, the piezoelectric element 2 on the left side of the drawing absorbs the traveling wave 12.
More specifically, the piezoelectric element 2 on the left side of the drawing vibrates, converts kinetic energy into electric energy, and radiates heat to the surroundings, thereby absorbing the vibration.

By this means, the sufficiently long filtration membrane cylinder 3 can be satisfactorily vibrated, and by this vibration, the cake layer can be separated and washed away with the stock solution.

FIG. 4 is a diagram showing the operating principle of the comparative example. When the piezoelectric element 2 is provided only at one end, the traveling wave 12 collides with the wall of the socket 6 and returns as a reflected wave 14. The reflected wave 14 may cancel the traveling wave 12 to reduce the vibration width. Therefore, the present invention is characterized in that two piezoelectric elements 2 and 2 are provided in order to eliminate the influence of the reflected wave 14.

In the example of FIG. 2, the vibration of the piezoelectric elements 2 and 2 is transmitted to the filtration membrane cylinder 3 via the pipe 5 and the sockets 6 and 6, so that the amplitude of the filtration membrane cylinder 3 itself becomes small. However, the piezoelectric elements 2 and 2 are easy to attach, and especially the piezoelectric elements 2 and 2 are
It is convenient because it is easy to maintain, inspect, and replace.

[0018]

As described above, according to the present invention, piezoelectric elements are attached to both ends of the filtration membrane cylinder of the filtration module or both ends of the tubular housing to enable the filtration membrane cylinder to vibrate.
The cake layer in the filtration membrane cylinder can be easily peeled and removed, so that the flow passage area of the raw water of the filtration module can be kept appropriate, and the filtration performance can be kept good.

[Brief description of drawings]

FIG. 1 is a sectional view of a filtration module according to the present invention.

FIG. 2 is a diagram showing another embodiment of the filtration module according to the present invention.

FIG. 3 is a diagram showing the operating principle of the piezoelectric element of the filtration module of the present invention.

FIG. 4 is a diagram illustrating the operating principle of a comparative example.

FIG. 5 is a sectional view of a conventional filtration module.

[Explanation of symbols]

1 ... Filtration module, 2 ... Piezoelectric element, 3 ... Filtration membrane cylinder, 4
… Cylindrical housing.

Claims (4)

[Claims] 1. A filtration module in which a filtration membrane tube is housed in a tubular housing, and piezoelectric elements are attached to both ends of the filtration membrane tube. 2. A filtration module in which a filtration membrane tube is housed in a tubular housing, and piezoelectric elements are attached to both ends of the tubular housing. 3. A filtration module in which a filtration membrane tube is housed in a tubular housing, a piezoelectric element is attached to one end of the filtration membrane tube, and a vibration absorbing material is provided at the other end of the filtration membrane tube. 4. A filtration module in which a filtration membrane tube is housed in a tubular housing, a piezoelectric element is attached to one end of the tubular housing, and a vibration absorbing material is provided at the other end of the tubular housing.