JPH06104186B2 - Filtration unit - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to filtration units.

2. Description of the Related Art Immersion type filtration units are equipped with a tubular ceramic membrane and are provided, for example, inside a biological treatment tank and are used for such purposes as filtering and removing only a clear liquid from a mixed solution to be treated. There is.

4 and 5 illustrate a conventional filtration unit of this type. This filtration unit has a plurality of tube-shaped ceramic membranes 1 as external pressure type membranes, and these membranes 1 are arranged in parallel at a distance from each other by supporting both ends thereof by headers 2 and 3. ing. One header 2 has a suction chamber 4 and a face plate 5, and one end of each ceramic film 1 penetrates the face plate 5 and opens inside the suction chamber 4. These ceramic films 1 are fixed to the header 2 with an adhesive 6. Further, the header 2 includes a suction chamber 4
A suction port 7 is provided for communicating with the outside.

The other header 3 has a concave portion 8 inside and is formed in a U-shaped cross section. The other end of the ceramic film 1 is put into the recess 8 and the open end of the ceramic film 1 is closed by the header 3. The concave portion 8 is filled with an adhesive 9 and hardened, and the adhesive 9 fixes the ceramic film 1 to the header 3.

A pair of plastic guide plates 10 is provided between the headers 2 and 3 for the purpose of protecting the film and rectifying the film. The guide plate 10 and the headers 2 and 3 are fixed to each other with an adhesive or the like.

The immersion type filtration unit having such a configuration is immersed in the mixed solution to be treated, for example, inside the biological treatment tank as described above. Then, as shown in FIG. 5, the mixed solution 11 flows, is rectified by the guide plate 10 and passes between the ceramic membranes 1. At this time, if a negative suction pressure is applied to the suction port 7, the mixed solution 11 is filtered by the ceramic membrane 1,
The clear water generated by filtration is taken out to the outside through the suction chamber 4 and the suction port 7.

Problems to be Solved by the Invention Such a filtration unit is assembled at room temperature and manufactured into a product, then placed in a biological treatment tank and immersed in a mixed solution to be treated. However, the mixed solution to be treated may be heated to about 40 to 60 ° C during the treatment, for example, during methane fermentation. If such a temperature rise occurs, the plastic guide plate 10 and the ceramic film 1 have a different coefficient of thermal expansion, and the guide plate 10 expands better. Therefore, a large tensile force is applied to the ceramic film 1 in the longitudinal direction. The ceramic film 1 may be damaged due to the stress, which is a problem.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve such problems and prevent tensile stress, which causes damage, from occurring in the ceramic external pressure type membrane even when the temperature is raised.

Means for Solving the Problems To achieve the above object, the present invention is a filtration unit in which headers are fixed to both ends of a plurality of tubular external pressure type membranes, and guide plates are provided between the headers. Fixing the header and one end of the guide plate to each other, forming a groove in the length direction of the external pressure type membrane at the other end of the guide plate, and forming a protrusion that fits in the groove on the other header, The other end of the guide plate and the other header are configured to be slidable relative to each other in the length direction of the external pressure type membrane.

Operation According to this structure, at the other end of the guide plate,
Since the guide plate and the other header fixed to the external pressure type membrane are slidable in the length direction of the external pressure type membrane by being guided by the groove and the protrusion, the external pressure type membrane and the guide plate are free from each other. Therefore, even if there is a difference in the coefficient of thermal expansion between the two, the tensile stress that causes breakage does not act on the external pressure type membrane.

Embodiment Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 to 3 by assigning the same reference numerals to the same members as those shown in FIGS. 4 and 5. explain.

In FIGS. 1 and 2, the guide plate 10 and the header 2 are fixed to each other with an adhesive or the like, and this point is the same as that shown in FIGS. 4 and 5.

On the inner surface of the end portion of both guide plates 10 on the header 3 side,
A groove 12 having a T-shaped cross section is formed in the length direction of the ceramic film 1 by a predetermined distance. A T-shaped protrusion 13 that fits into the groove 12 is formed in a portion of the header 3 corresponding to the guide plate 10. And these guide plates
10 and the header 3 are slidable with respect to each other in the length direction of the ceramic film 1 with the groove 12 and the protrusion 13 fitted to each other.

With such a configuration, even if the temperature of the liquid to be treated around the filtration unit rises, the guide plate 10 having a larger coefficient of thermal expansion than the ceramic membrane 1 expands freely as shown in FIG. No tensile stress acts on the ceramic film 1. Therefore, the occurrence of an accident such as damage to the ceramic film 1 is prevented.

EFFECTS OF THE INVENTION As described above, according to the present invention, the groove formed in the guide plate and the protrusion of the header connected to the external pressure type membrane are fitted to each other so that the guide plate and the header are long with respect to each other. Since it is configured to slide in the depth direction, even if the guide plate expands due to a temperature rise, it is possible to prevent a situation in which a large tensile stress acts on the external pressure type membrane and damages the external pressure type membrane. Instead, by the groove portion and the protrusion portion that fit with each other, the expansion and contraction operations of the guide plate and the external pressure type membrane can be accurately guided in the length direction of the external pressure type membrane.

[Brief description of drawings]

1 is a sectional view of an immersion type filtration unit according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a thermal expansion of the immersion type filtration unit of FIG. Figure showing the state, No. 4
The figure is a cross-sectional view of a conventional immersion type filtration unit, and FIG.
It is the VV sectional view taken on the line of FIG. 1 ... Ceramic membrane (external pressure type membrane), 2, 3 ... Header, 10
…… Guide plate, 12 …… groove, 13 …… projection.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihisa Narukami 1-47 Shiketsu East, Naniwa-ku, Osaka City, Osaka Prefecture Kubota Iron Works Co., Ltd. (72) Masatsugu Yamagata Shikazu, Naniwa-ku, Osaka City, Osaka Prefecture 1-2-7 Higashi Inside Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] 1. A filtration unit in which a header is fixed to both ends of a plurality of tubular external pressure type membranes and guide plates are provided between the headers, and one header and one end of the guide plate are fixed to each other. Then, a groove in the length direction of the external pressure type membrane is formed at the other end of the guide plate, and a protrusion that fits in the groove is formed at the other header, and the other end of the guide plate and the other header are formed. A filtration unit characterized in that it is configured to be slidable in the length direction of an external pressure type membrane.