JPH0737682Y2 - Activated carbon filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an activated carbon filter for adsorbing and removing contaminants in a fluid.

(Prior Art) An activated carbon filter is used to adsorb and remove contaminants contained in a fluid, such as chlorine in drinking water. As the activated carbon filter, granular activated carbon is contained in a container having a large number of pores on the inflow side and the outflow side of the fluid, and the container is disposed in a casing having a water inlet / outlet, and the activated side of the outlet side of the container is filtered. The one in which the hole communicates with the outlet of the casing was used. However, a container filled with such granular activated carbon requires a container, and has a drawback that the amount of activated carbon per volume is small and it becomes sublime, and wear powder of activated carbon flows out. Therefore, a fibrous activated carbon formed into a tubular shape is used. An example thereof is shown in FIG. Fibrous activated carbon 31
An annular end plate 32 is provided on the upper end surface of the filter medium 31 in which a is formed into a tubular shape
Attach the circular end plate 33 to the lower end surface with an adhesive and
A casing 37 in which a cup-shaped body 35 having an inlet hole 35a and a cover 36 having an outlet hole 36a are combined, the element 34 is housed, and the upper surface thereof is fixed to the inner surface of the cover 36, and the element is formed. Outlet hole in the lumen of 34
The activated carbon filter 38 is connected to 36a.

(Problems to be solved by the invention) In the conventional activated carbon filter as described above, the end portion of the activated carbon filter medium 31 is embedded in the adhesive when the end plates are fixed by the adhesive, so that the filter medium is disabled by the thickness of the adhesive layer. Become. In addition, the activated carbon in the vicinity absorbs the adhesive and loses the adsorption effect. Further, since the end plate is provided with a rising flange (32a, 33a in FIG. 3) in a dish shape to apply the adhesive to a predetermined thickness, the outer side surface of the filter medium 31 is blocked and the inflow surface is narrowed by that amount. For these reasons, an ineffective portion is generated in the activated carbon filter medium 31 and the adsorption removal capacity per fixed volume is reduced. There is also a risk that the adhesive may peel off and the fragments may flow out from the outlet.

(Means for Solving the Problem) The lower end of a cylindrical filter medium made of fibrous activated carbon and having elasticity is pressure-bonded to an annular bead provided on an end plate, and an outlet hole is provided above.
It is disposed in a casing having an inlet hole at the bottom, the other end of the filter medium is crimped to an annular bead provided around the outlet hole of the inner wall of the casing, and fixing means for fixing the position of the end plate is provided. It is configured to be sandwiched by annular beads that are crimped at both ends.

(Function) In this activated carbon filter, the end surface of the cylindrical filter medium is held by being sandwiched between the annular bead of the end plate and the annular bead of the casing, and the inflow side and the outflow side of the filter medium are separated by the outside and the inside of both beads. Then, the inner space of the filter medium communicates with the outlet hole of the casing.
The end plate is fixed by the fixing means of the end plate, and thus the filter medium is also fixed to the inner wall of the casing. Since the annular bead is press-fitted into the end surface of the filter medium and bites therein, the gap between the end surface of the filter element and the end plate or the inner wall of the casing changes depending on the amount of bite.
Further, the area distribution in which the end surface of the filter medium is divided into the inflow side and the outflow side is determined by the size of the diameter of the annular bead. Since the end surface of the filter medium does not use an adhesive, it is not embedded in the adhesive or sucked up.

(Embodiment) FIG. 1 shows an activated carbon filter 7 for removing chlorine from tap water as an embodiment of the present invention. An end plate 2 provided with an annular rib 2a on the lower end surface of a cylindrical filter medium 1 formed by winding a sheet made of fibrous activated carbon 1a is press-bonded with the annular rib 2a biting into the lower end surface of the filter medium 1. . The open end of the cup-shaped body 3 made of synthetic resin and having the water inlet hole 3a is connected to the water outlet hole 4a.
The cover 4 having the above is covered and coupled to form a casing 5, and the filter medium 1 is disposed inside thereof. The upper end surface of the filter medium 1 is pressure-bonded to an annular rib 4b provided on the inner wall of the cover 4 so as to surround the water outlet hole, and the rib 4b bites into the end face of the filter medium 1. A short tubular boss portion 4c is provided around the water outlet hole 4a toward the inside of the casing, and the inner wall 1b of the cylindrical filter medium 1 is provided.
The upper end portion of is fitted into the outer wall of the boss portion 4c. A spacer 6 is provided between the lower surface of the end plate 2 and the bottom surface of the body 3. The spacer 6 is a fixing means for fixing the position of the end plate and thus the filter medium 1. Since the filter medium 1 has a slight elasticity, the amount of the ribs 2a, 4b that bite into the end face of the filter medium 1 is determined by setting the height dimension of the spacer 6, so that the other part of the end face of the filter medium 1 and the end plate. It is possible to make an adjustment such that the upper surface of 2 and the lower surface of the cover 4 are brought into close contact with each other or a slight gap is provided. When such a gap is provided, the pressure loss of water passing through the filter medium 1 is reduced as a whole, and a flow path having a short distance through activated carbon is formed only by bypassing the bite portions of the ribs 2a and 4b. Therefore, the amount of chlorine removed from this portion of water is small, and the amount of residual chlorine as a whole can be a little large. Further, if the diameters of the ribs 2a and 4b are changed, the area distribution of the end surface of the filter medium 1 to the inflow side and the outflow side can be changed.

By changing the bite amount or the diameter of the rib as described above, it is possible to match the adsorption / removal efficiency with the target value, or to reduce the flow path resistance to extend the life of the filter medium.

A second embodiment is shown in FIG. The filter medium 1, the end plate 2 having the ribs 2a, and the body 3 of the activated carbon filter 17 are the same as those in FIG. The open end of the body 3 is covered with a cover 14 provided with an annular rib 14b around the water outlet hole 14a and coupled to form a casing 15. An annular groove 14c is provided on the inner wall of the water outlet hole 14a. A perforated center tube 16 is erected upward from the center of the end plate 2, penetrates the inner cavity 1b of the filter medium 1 and reaches the water outlet hole 14a, and the claw 16a provided at the upper end of the center tube 16 is the annular groove. 14c is engaged and fixed. The center tube 16 is a fixing means for fixing the position of the end plate 2 and thus the filter medium 1.

In FIGS. 1 and 2, solid arrows indicate inflow water, and dotted arrows indicate outflow water after chlorine removal.

The present invention is suitable as an activated carbon filter for adsorbing and removing impurities contained in other liquids or gas bodies in addition to the above-mentioned respective embodiments.

(Effect of the Invention) The activated carbon filter of the present invention holds the end surface of the activated carbon filter medium by sandwiching it with the ribs provided on the end plate and the inner surface of the cover. Since no adhesive is used, it is embedded in the adhesive or the adhesive There is no part where activated carbon loses its adsorption capacity by wicking. Therefore, since the total amount of activated carbon has an effective adsorption action, the efficiency of adsorption and removal of contaminants is high and downsizing is possible. Further, since the gap between the end face of the filter medium and the end plate or the casing inner wall can be adjusted, it is possible to adjust the adsorption capacity and the pressure loss characteristics of the filter medium and the casing having the same size. Further, the bonding step is not required, the structure is simple and the manufacturing cost is reduced.

[Brief description of drawings]

1 and 2 are sectional views showing an embodiment, and FIG. 3 is a sectional view of a conventional activated carbon filter. 1 ... Filter material, 2 ... End plate, 2a ... Rib 3 ... Body, 4, 14 ... Cover 4b, 14b ... Rib, 6 ... Spacer 16 ... Center tube

Claims (1)

[Scope of utility model registration request] 1. A casing having a cylindrical filter medium made of fibrous activated carbon and having elasticity and having its lower end pressure-bonded to an annular bead provided on a disk-shaped end plate to have an outlet hole in the upper part and an inlet hole in the bottom part. The filter medium is provided inside the casing, and the upper end of the filter medium is crimped to an annular bead provided around the outlet hole of the inner wall of the casing to provide a fixing means for fixing the position of the end plate to the casing. An activated carbon filter that is sandwiched by an annular bead with the inner wall.