JPS643442Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air venting structure for a tubular membrane module, and in particular, all U-bends of the upper head of a vertical tubular membrane module are provided with independent communication holes with outside air, and the operation of the module is improved. By opening the sealing plate of the communication hole when the machine is not in operation, the inside of the porous support tube is communicated with the outside air, thereby preventing the inside of the tube from being depressurized, and at the same time, it is possible to bleed air at the start of operation.

The tubular membrane used in tubular membrane modules is usually obtained by casting a semipermeable membrane on the inner surface of a porous support tube.
It is used in conjunction with a porous support tube, but cellulose acetate-based semipermeable membranes have a weak stiffness, and when the module is stopped, raw water permeates through the membrane and the pressure inside the tubular membrane is reduced, causing the inside of the porous support tube to deteriorate. There were problems such as the film peeling off from the surface and damage, and problems such as difficulty in removing air from the upper U-bend.

The present invention was developed to solve these problems, and its specific structure consists of a number of porous support tubes into which separation tubular semipermeable membranes are inserted, arranged vertically in parallel, and housed in a cylindrical case. In a tubular membrane module in which both ends of the case are fixed with heads having a large number of U-bends, the porous support tubes are connected in a zigzag manner, and the two heads are tightened with a single long bolt, all of the upper part of the case is fixed. A communication hole between each of the U-bends and the outside air is opened near the long bolt of the upper head, and a sealing plate that simultaneously seals all the opened communication holes is screwed onto the long bolt. This is an air-bleeding structure of a tubular membrane module.

The present invention will be explained below based on the illustrated embodiments.

FIG. 1 is an explanatory cross-sectional view of the main part of the module.
In the figure, a module M has a porous support tube 1 with a tubular membrane 2 formed on its inner surface arranged vertically in parallel inside a case 3, and fixed from both ends with a head 4 having a large number of U-bends 6 to form the porous support tube 1. The two heads 4 are connected in a zigzag manner, and both heads 4 are fastened together with long bolts 5. In the present invention, the communication holes 7 between all the upper U-bends 6 and the outside air are opened near the long bolts 5 of the upper head 4, and a sealing plate 8 is provided to seal all the communication holes 7 at the same time. It is screwed onto the long bolt 5. A handle 9 is integrally provided on this sealing plate 8.
The communication hole 7 can be sealed and opened by operating the handle 9. Head 4 of sealing plate 8 again
A gasket 10 is applied to the surface in contact with the hole 7, so that the communication hole 7 can be easily sealed.

Since the present invention has the above-mentioned structure, when the module starts operating, the sealing plate is raised to open the communication hole and the inside of the U-bend (as a result, inside the tubular membrane) is removed.
The air can be completely removed, and when the operation is stopped, the sealing plate is raised and the communication hole is communicated with the outside air, so that the inside of the U-bend or the tubular membrane becomes atmospheric pressure.
It is possible to prevent the raw water inside the tubular membrane from permeating the membrane and creating a reduced pressure (negative pressure) inside the tubular membrane. Therefore, no peeling of the film occurs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a cross section of the main part of the module. DESCRIPTION OF SYMBOLS 1... Porous support tube, 2... Tubular membrane, 3... Case, 4... Head, 5... Long bolt, 6... U
Bend, 7...Communication hole, 8...Sealing plate.

Claims (1)

[Scope of utility model registration request] A large number of porous support tubes into which separation tubular semipermeable membranes are inserted are arranged vertically in parallel, housed in a cylindrical case, and both ends of the case are fixed with heads having a large number of U-bends. In a tubular membrane module that communicates in a zigzag pattern and connects both heads with a single long bolt, the communication holes between all the upper U-bends and the outside air are opened near the long bolt of the upper head, and An air vent structure for a tubular membrane module characterized by a sealing plate screwed onto a long bolt that simultaneously seals all open communication holes.