JPH07108394B2 - Filter manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a filter for filtering drinking water and the like.

2. Description of the Related Art Recently, a hollow fiber membrane formed by bundling hollow fibers having innumerable fine pores has come to be used as a filter medium for filtering drinking water and the like. The hollow fiber membrane is a kind of filter that filters water by using fine pores on the wall surface of the hollow fiber.When used, water penetrates the wall surface from the outside of the water hollow fiber and flows into the inside of the hollow fiber. The water in the hollow fiber is filtered out, and the water flowing into the hollow fiber flows out through the opening at the end of the hollow fiber. The hollow fiber membrane has an excellent performance of removing bacteria even though it has the following drawbacks and has not been widely used. That is, when used for a long period of time, countless general bacteria adhere to the surface of the hollow fiber, which proliferates, and some chemical substances such as hydrogen sulfide generated therefrom are mixed in the filtered water, and the filtered water gives off a bad odor. It is a drawback.

Hereinafter, an example of a conventional filter using a hollow fiber membrane will be described with reference to the drawings.

FIG. 2 is a sectional view of a conventional filter divided vertically. In FIG. 2, reference numeral 1 denotes a filter body (hereinafter referred to as a main body), which has a water supply pipe 2 for guiding raw water in the lower part and a lid 4 having a discharge pipe 3 in the upper part. Reference numeral 5 is a hollow fiber constituting the hollow fiber membrane, and 6 is a hollow fiber membrane case. The wall surface of the hollow fiber 5 is provided with innumerable micropores, which are bent into a U shape and bundled, and the end portion 5a thereof is fixed to the hollow fiber membrane case 6 with a synthetic resin or the like. That is, the synthetic resin is filled between the hollow fibers 5 and between the hollow fibers 5 and the inner wall of the hollow fiber membrane case 6, and the synthetic resin prevents water from passing outside the hollow fibers 5. Along with the hollow fiber 5
Is fixed in the hollow fiber membrane case 6. Reference numeral 7 is a filtered water outlet provided in the hollow fiber membrane case 6. Numeral 8 is an activated carbon case, which is provided with an inlet 9 for raw water in the lower part thereof, and is filled with granular activated carbon 10 as a filter medium, and mesh filters 11 and 12 are provided on both sides of the activated carbon storage portion so as to prevent backflow and outflow of the activated carbon 10
Is equipped with. The granular activated carbon to be enclosed in the activated carbon case 8 has a grain size of 0.21 to 0.24 mm. Then, the hollow fiber membrane case 6 and the activated carbon case 8 are joined to complete the filtration cartridge 13, which is inserted into the filter body 1. Reference numeral 14 denotes powdered activated carbon that adsorbs dead bodies such as general bacteria attached to the surface of the hollow fiber 5 and hydrogen sulfide odor generated from the bacteria themselves.

Next, a method of enclosing the powdered activated carbon 14 and assembling the filtration cartridge 13 will be described.

FIG. 4 is a view showing a state of injecting powdered activated carbon.
In FIG. 4, with the opening of the hollow fiber membrane case 6 facing upward, a fixed amount of powdered activated carbon is injected from above with a funnel or the like. Then, as shown in FIG. 5, the activated carbon case 8 is fitted into the opening of the hollow fiber membrane case 6, and both cases are joined by ultrasonic welding.

Next, the usage state will be described. When used, water is passed through the filter along the arrow shown in FIG. That is, the raw water supplied from the water supply pipe 2 has residual chlorine and the like removed by the granular activated carbon 10, and the hollow fiber membrane formed by bundling the hollow fibers 50 removes dust components such as iron rust and general bacteria. Is discharged from the discharge pipe 3. Further, the activated carbon powder 14 is attached to the hollow fibers 5 so as to cover the surface thereof by passing water as shown in FIG. By the way, if the powdered activated carbon 14 is simply injected into the hollow fiber membrane case 6, the powdered activated carbon 14 will only adhere to the tip portion 15 of the hollow fiber bundle, but when the water is passed, it will reach the root 16 of the hollow fiber bundle. Go in.
Then, the powdered activated carbon 14 adsorbs the dead bodies of general bacteria adhering to the surface of the hollow fiber 5 and the hydrogen sulfide odor generated by the growth of bacteria.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, powdered activated carbon contained in the hollow fiber membrane case 6
Some of the 14 particles may be compacted together or mixed with water to form a large amount of activated carbon. Even if these get wet with water, the water only soaks into the epidermis and does not dissolve easily. The bundle of hollow fibers is full in the hollow fiber membrane case 6, and when water is passed, the activated carbon clogs are clogged in the hollow fiber bundle or between the hollow fiber and the inner wall of the hollow fiber membrane case. . Then, other fine particles will be generated at the base of the hollow fiber bundle 16
It has been difficult to spread the activated carbon particles evenly from the tip to the root of the hollow fiber bundle.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a filter that allows powdered activated carbon to reach the root of a hollow fiber bundle.

Means for Solving the Problems In order to solve the above problems, a method for manufacturing a filter according to the present invention is, after encapsulating a powdered activated carbon in a case, air entering from a water inlet, passing through the case, and exiting from a water outlet. It is characterized by causing a flow.

In addition, it is suitable to bend a plurality of hollow fibers in a U shape and to bundle both ends of the hollow fibers so that they are bundled and housed in a case.

Furthermore, it is suitable to use the air flow of the leak test as the air flow.

Action Since the air flow is generated after enclosing the powdered activated carbon, the mass of the activated carbon is pulverized by the air flow to form fine particles. Moreover, since the hollow fibers are bent in a U shape and both ends of each hollow fiber are aligned and bundled and housed in a case, a compact structure can be obtained. Furthermore, since the air flow of the leak test is used as the air flow, the activated carbon can be crushed and attached to the surface of the hollow fiber at the same time as the test of the leak or the like.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the configurations of the hollow fiber membrane case 6 and the hollow fiber 5
Since the method for fixing the hollow fiber 5 to the hollow fiber membrane case 6, the activated carbon case 8 and the internal structure thereof are the same as those of the conventional example, the same numbers are assigned to the respective parts and the detailed description is omitted. .

The manufacturing process until the filtration cartridge is completed will be described below. First, a net filter on the bottom of the activated carbon case 8.
Install 11. Then, the granular activated carbon 10 is injected and the net filter 12 is attached. On the other hand, powdered activated carbon 14 is injected into the hollow fiber membrane case 6. Then, the hollow fiber membrane case 6 and the activated carbon case 8 are fitted to each other and joined by ultrasonic welding or the like.

Reference numeral 17 is an electric blower, and 18 is an air blowing nozzle of the electric blower 17. After the assembly of the filtration cartridge is completed as described above, the air blowing nozzle 18 of the electric blower 17 is connected to the inflow port 9 provided in the lower part of the activated carbon case 8 to start the blowing operation. The flow velocity is approx.
Set to 8m / s. During the blowing operation, air enters the hollow fiber membrane case 6 from the activated carbon case 8 as shown by the arrow, enters the hollow fiber 5 through the fine holes on the surface of the hollow fiber 5, and from the end of the hollow fiber 5. Go outside. The powdered activated carbon 14 soars by this air flow, is attracted to the surface of the hollow fiber 5, and adheres to the surface of the hollow fiber 5. Of course, powdered activated carbon 14
Is dry and spreads well to the root portion 16 of the hollow fiber bundle, and adheres evenly from the tip of the hollow fiber bundle to the root portion. Also, a large amount of activated carbon lumps are gradually pulverized while jumping by the force of the air flow, become completely powdery within a few seconds, and adhere to the surface of the hollow fiber 5.

By the way, after the assembling of the filtration cartridge 13 is completed, it is necessary to inspect whether leakage or the like occurs during water passage. One of the methods is a leak test using air. That is, a leak test pressurizing device is connected to the inflow port 9, a predetermined air pressure is applied, and a filtration cartridge is applied.
It is to check whether the amount of air passing through 13 is within the specified range. In the above examples, the air blowing treatment was performed only to adhere the powdered activated carbon 14 to the surface of the hollow fiber 5. However, since the air flows in the same direction during the leak test, the powdered activated carbon was used in the leak test. The number of man-hours can be reduced by combining the air-blowing process for adhering to the surface of.

Effects of the Invention As described above, according to the present invention, by enclosing powdered activated carbon in a hollow fiber membrane case, an air flow entering from the water inlet of the hollow fiber membrane case, passing through the case and exiting from the water outlet is generated. Even if a large activated carbon lump is formed, the activated carbon lump is crushed by the air flow into fine particles and is not clogged in the hollow fiber bundle or between the hollow fiber and the inner wall of the hollow fiber membrane case. Therefore, the activated carbon particles satisfactorily reach the root of the hollow fiber bundle and are uniformly attached from the tip to the root of the hollow fiber bundle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a filtration cartridge showing an air blowing process for adhering powdered activated carbon to hollow fibers in an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a usage state of a filter incorporating the filtration cartridge. 3 and FIG. 3 are views showing hollow fibers inside the filtration cartridge, FIG. 4 is a cross-sectional view showing a state in which powdered activated carbon is injected into the filtration cartridge, and FIG. 5 is an assembly end of the filtration cartridge. It is sectional drawing which shows a state. 1 ... Main body case, 2 ... Water supply pipe 3 ... Discharge pipe, 4 ... Lid 5 ... Hollow fiber, 6 ... Hollow fiber membrane case 8 ... Activated carbon case, 10 ... Granular activated carbon 11, 12 ...... Net filter 14 …… Powdered activated carbon, 17 …… Electric blower 18 …… Air blowing nozzle

Claims (3)

[Claims] 1. A plurality of hollow fibers having fine holes on the surface are bundled and accommodated in a case having a water inlet and a water outlet, and a gap between the plurality of hollow fibers is provided in the case near the water outlet. A method of manufacturing a filter provided with a filling body for filling, wherein, after enclosing powdered activated carbon in the case, an air flow that enters through the water inlet and passes through the case and exits through the water outlet is generated. A method for manufacturing a filter, comprising: 2. The method for manufacturing a filter according to claim 1, wherein the hollow fiber is bent in a U shape and both ends of the hollow fiber are aligned and housed in a case. 3. The method of manufacturing a filter according to claim 1, wherein an air flow entering from the water inlet, passing through the case, and exiting the water outlet is a leak test air flow.