Straight riveting type membrane module

Abstract

The utility model discloses a straight riveting membrane module. The method comprises the following steps: drilling a membrane filament hole array on a metal plate to form a pattern plate; each hollow fiber membrane wire penetrates through a corresponding membrane wire hole in the tubesheet; a hollow rivet is arranged in the end part of each membrane filament hole; and the end parts of the membrane filaments are directly fixed in the membrane filament holes in the tubesheet by the hollow rivets in a rivet pulling or tube expanding manner. The straight riveting type membrane assembly is simple in structure, easy to manufacture, resistant to high temperature, corrosion and aging.

Description

Technical Field

[0001] Direct riveting membrane module. A membrane module that directly fixes hollow fiber membranes to a tube sheet by riveting. Background Art

[0002] There are various methods to fabricate hollow fiber membranes into membrane modules. The classic and traditional way is to bundle the membrane filaments, fix them in advance, then encapsulate them with resin, and finally cut them evenly to make all the tube ends unified, neat, fixed, and exposed. This method is commonly used in the production of water treatment membrane modules.

[0003] Since the emergence of dedicated hollow fiber membranes for air purification, due to the fact that the membrane filaments used in air purification applications operate in environments with high temperature, high dust, high corrosion, and high air volume, the classic and traditional casting and encapsulation methods can no longer meet the requirements. For example, commonly used encapsulation materials such as epoxy resin, silicone rubber, and polyurethane are difficult to work in a 260-degree environment for a long time, while special glues are expensive and the encapsulation process is complex. Moreover, hollow fibers made of high-temperature-resistant plastics such as PDFE are inherently non-sticky and it is difficult to achieve reliable adhesion with the colloid.

[0004] How to fix this new type of membrane filament with a large diameter, thin wall, and large required spacing has become a new issue.

[0005] Patents CN111992038A and CN211189524U propose methods to fix membrane filaments mechanically. However, the fasteners used in these methods are too complex, costly, and the assembly process is complicated. In many cases, high-temperature-resistant glue and hollow screw structures are still inevitably used, and many problems have occurred in large-scale use, which is not conducive to large-scale automated production. Summary of the Invention

[0006] In view of these various defects, the present invention proposes a new solution: a direct riveting membrane module, which is characterized in that: on a metal plate with a thickness of 1 - 10 mm, a membrane filament hole array is drilled to form a tube sheet; each hollow fiber membrane filament passes through a corresponding membrane filament hole on the tube sheet; at the end of each membrane filament hole, there is a hollow rivet; the end of the membrane filament is fixed in the membrane filament hole on the tube sheet by the hollow rivet in a way of blind riveting or expanding the tube.

[0007] This invention is not "easily conceivable". Firstly, the use of hollow fiber membranes for the treatment of high-temperature, high-dust, highly corrosive, and high-volume gases is a new invention with a history of less than 10 years. It has not been widely applied yet, and the technical details are still new topics. Secondly, there is no precedent or similar literature found for directly fixing thousands of membrane filaments with a wall thickness of only 0.2 - 0.5 mm, a diameter of only 2 - 5 mm, and a length of 1200 mm to a steel plate to form a membrane module. The resulting problems such as air resistance, tensile strength, and aging are not intuitive, and it is uncertain whether it can be achieved. Only through repeated experiments and countless trials and errors was the feasibility and practicality of this invention finally explored. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] APPENDIX Figure 1 It is a microscopic partial schematic diagram of a direct riveting type membrane module. In the figure, (01) is a partial view of a perforated plate with an array of membrane filament holes; (02) is the end of a hollow fiber membrane filament passing through the membrane filament hole and fixed to the perforated plate; (03) is a hollow rivet; (04) is the deformation bulge generated after the hollow rivet is acted on by a riveting mandrel or an expansion tube tool. DETAILED DESCRIPTION OF THE INVENTION

[0009] The design of the direct riveting type membrane module has been used in the applicant's production practice. A typical product is a direct riveting type membrane module composed of 1400 membrane filaments, with a perforated plate area of 400 mm X 250 mm; the plate thickness is 4 mm; the membrane filaments are directly fixed in the membrane filament holes with a riveting gun; the membrane filaments are made of PDFE hollow fiber membranes. It can work reliably for a long time in an environment of high dust, highly corrosive gas, and 260 degrees Celsius. Especially after adding an anti-corrosion coating to the perforated plate and rivets, it can work for a long time under strong acid conditions with all three strong acids present.

Claims

1. Direct riveting membrane module, characterized in that: On a metal plate with a thickness of 1 - 10 mm, a membrane filament hole array is drilled to form a perforated plate; each hollow fiber membrane filament passes through a corresponding membrane filament hole on the perforated plate; there is a hollow rivet at the end of each membrane filament hole; the end of the membrane filament is fixed in the membrane filament hole on the perforated plate by the hollow rivet in a way of blind riveting or expanding the tube.

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