JP3008230U - Cap for hollow fiber membrane module - Google Patents

Abstract

(57) [Summary] [Structure] A hollow fiber membrane module cap that has an undercut over the entire circumference, and has a linear protrusion on the inner surface of the cap that contacts the opening of the hollow fiber membrane module. A hollow fiber membrane module cap, which is provided over the circumference. [Effect] The opening of the hollow fiber membrane module can be reliably sealed at low cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cap used for sealing a flange type or ferrule type opening in a hollow fiber membrane module.

[0002]

[Prior art]

 Hollow fiber membrane modules are generally used for reverse permeable membranes, ultrafiltration membranes, microfiltration membranes, etc. because of their large membrane area per unit volume. The hollow fiber membrane module loses the function of the membrane when it is dried like an ultrafiltration membrane, and once the membrane is dried even with a microfiltration membrane, a hydrophilizing agent such as alcohol is generated. They are generally stored and transported in full or wet conditions because of their need. The hollow fiber membrane module usually has four openings, and generally contains a preservative such as formalin, so if the opening is a flange type, it is a blind plate and a V-band so that the liquid does not leak. If the opening is a ferrule type, it is sealed with a blind plate and a clamp.

However, the process of sealing the opening is repeated several times when the module is manufactured, which is not only troublesome but also expensive. In Japanese Patent Application No. 6-8203, a method of sealing the opening of the hollow fiber membrane module was proposed by combining a cap having an undercut on the entire circumference and a shrink film. However, even with this method, a large module is filled with water. The seals were not perfect when stored or transported in the state.

[0004]

[Issues to be solved by the device]

 An object of the present invention is to provide a cap that can reliably seal an opening of a hollow fiber membrane module at low cost.

[0005]

[Means for Solving the Problems]

 According to the present invention, in a cap having an undercut over the entire circumference, at least one linear protrusion is continuously provided over the entire circumference on a portion of the inner surface of the cap that contacts the opening of the hollow fiber membrane module. Is a cap for a hollow fiber membrane module.

An example of the hollow fiber membrane module cap of the present invention is shown in FIG. In FIG. 2, reference numeral 1 is a module, and the module has a primary side opening 2 and a secondary side opening 5. In the present invention, the primary side opening means the inlet of the undiluted solution and the outlet of the concentrated solution, the secondary side opening means the outlet of the filtrate, and the opening of the present invention means the primary side. The opening and the secondary side opening are collectively referred to. Generally, three types of openings are used: a flange type, a ferrule type, and a union type. The cap of the present invention is used for a flange type and a ferrule type opening.

The module of FIG. 2 shows an internal pressure filtration type module, in which the primary side opening 2 is a flange type, and the primary side opening 2 is first closed by a cap 3, and then the cam 3 The top is covered with the shrink film 4 and sealed. The secondary side opening 5 is a union type, and is sealed by pressing a blind plate against the secondary side opening 5 and then tightening a cap nut. In the external pressure filtration type module, the primary side opening and the secondary side opening are at opposite positions.

On the inner surface of the cap 3, a linear protrusion 7 is continuously provided over the entire circumference of the cap at a portion in contact with the opening of the module. The number of linear protrusions 7 is preferably about 1 to 4. The cap 3 is made of rubber or soft plastic, and covers not only the opening surface but also the side surface of the opening by providing an undercut over the entire circumference of the cap. Is shown in FIG. The size of the cap 3 is preferably a little smaller than the opening of the module and is so large that it can be pushed into the opening and inserted. Further, the cross-sectional shape of the linear protrusion may be of various shapes such as a triangle, a trapezoid, and an ellipse, and the height of the protrusion is preferably about 0.2-2 mm. The width of the protrusion is preferably about 0.5 to 3 mm at the bottom and less than 1 mm at the top.

Here, the soft plastics include low-density polyethylene, soft polyvinyl chloride resin, polystyrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer. Thermoplastic Elastomer, Polybutadiene Thermoplastic Elastomer, Polyvinyl Chloride Thermoplastic Elastomer, Natural Rubber Thermoplastic Elastomer, Fluoro Rubber Thermoplastic Elastomer, Chlorinated Polyethylene Thermoplastic Elastomer, Ethylene Vinyl Acetate Thermoplastic Elastomer And other thermoplastic elastomers. A soft plastic having an A hardness of 90 or less according to JIS K6301 is preferable.

Examples of rubber that can be used for the cap 3 include rubbers such as NBR, silicone rubber, urethane rubber and the like.

[0011]

【Example】

 Hereinafter, a detailed description will be given based on examples.

[0012]

Example 1 First, aseptic water or the like was placed in an ultrafiltration module 1 having an outer diameter of 140 mm as shown in FIG. 2 (outer diameter of primary opening 157 mm, outer diameter of secondary opening 50.5 mm). Fill the filling solution of. At this time, in order to be able to fill the inside of the module, if necessary, some of the openings on the primary side or the secondary side should be closed in advance with a rubber cap that has been used conventionally. You may fill while using. After filling, in the primary opening 2, for example, as shown in FIG. 1, a protrusion 7 having an undercut, a height of 0.5 mm and a width of 1 mm at the bottom has a triangular cross section continuously over the entire circumference of the inner surface. A cap 3 made of silicon rubber having an inner diameter of 156 mm and a depth (outer side) of 13 mm is covered. The opening on the secondary side is covered with a blind plate and sealed with a cap nut 6. Next, the shrinkable film 4 may be covered on the opening on the primary side, and the shrinkage film 4 may be shrunk with a dryer to be hermetically sealed. In FIG. 2, when a shrink film made of polyvinyl chloride having a folding width of 280 mm, a width of 35 mm and a thickness of 150 μm was used in the primary side opening, no leak of the filling liquid was observed even after storage for 3 months.

[0013]

Comparative Example 1 In Example 1, when the cap on the primary side having no protrusion on the inner surface was used, a minute leak of the filling liquid occurred after storage for several hours.

[0014]

[Effect of device]

 According to the present invention, the opening of the module can be inexpensively and reliably sealed.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an example of a cap of the present invention.

FIG. 2 is a schematic view of a hollow fiber membrane module using the cap of the present invention.

[Explanation of symbols]

 1 Module 2 Primary Side Opening 3 Cap 4 Shrink Film 5 Secondary Side Opening 6 Cap Nut 7 Linear Protrusion

Claims (1)

[Scope of utility model registration request] 1. In a cap having an undercut over the entire circumference thereof, at least one linear protrusion is provided on a portion of the inner surface of the cap that comes into contact with the opening of the hollow fiber membrane module.
A hollow fiber membrane module cap, which is provided continuously over the entire circumference.