CN203187803U - Spinning nozzle for manufacturing hollow fiber film with strengthening ribs - Google Patents

Abstract

The utility model relates to a spinneret for preparing a hollow fiber membrane with reinforcing ribs, comprising a spinneret upper die, a spinneret lower die, a spinneret bottom plate and a driving motor, and the spinneret upper die is fixed on the equipment , the spinneret bottom plate is fixed to the bottom end of the spinneret upper mold, and the inner wall of the spinneret lower mold casting liquid channel is provided with a semicircular groove along the axial direction; the drive motor Fixed on the motor base, the motor base is fixed on one side of the upper die of the spinneret, the motor shaft of the driving motor is provided with a motor shaft output gear, and the output gear of the motor shaft is connected with the lower die of the spinneret. The toothed discs on the die mesh with each other to drive the lower die of the spinneret to rotate. Ribs can be formed on the outer wall of the hollow fiber membrane formed under the action of the inner and outer gel liquid. The number of ribs can be controlled according to the number of semicircular grooves, and the pitch of the ribs can also be controlled by the speed of the motor rotation. The spinneret can significantly improve the mechanical strength of the hollow fiber membrane.

Description

A spinneret for preparing hollow fiber membranes with reinforcing ribs

technical field

The utility model relates to a method for preparing a hollow fiber membrane, in particular to a spinneret for a hollow fiber membrane with spiral reinforcing ribs. the

Background technique

Membrane distillation (MD) is a membrane separation process that uses a hydrophobic microporous membrane and uses the vapor pressure difference on both sides of the membrane as the driving force. MD technology is characterized by its high separation and purification efficiency, no pollution to the environment, and easy coupling and integration with other purification processes. Show great application prospects. the

At present, researchers have conducted detailed and in-depth research on the preparation of membranes for membrane distillation, the optimal design of membrane modules, the mechanism of mass and heat transfer, and the establishment of mathematical models, and have made great progress. However, MD technology has not been really popularized and applied at present. The main reasons are: 1) the lack of commercialized high-flux, high-strength and hydrophobic membranes; 2) the membrane flux decreases due to the existence of channeling effects after the membrane module is enlarged. Obviously, the optimal design of components needs to be strengthened. 3) The existence of membrane scale in the concentration process, the inevitable membrane wetting phenomenon, the phenomenon of hydrophobic membrane adhesion and its online membrane cleaning and membrane performance repair lead to the long-term stable operation of the MD process has become an urgent problem to be solved. Among the three factors affecting the progress of MD technology, the development of MD film is the key, and the three are interrelated. the

Similar to other membrane processes, structural parameters such as membrane wall thickness have an important impact on the MD mass transfer process. In order to reduce the mass transfer resistance of the membrane and improve the hydrophobicity and mechanical strength of the membrane, the researchers mainly selected the formulation of the casting solution and the parameters of the spinning process, from the control of the pore size distribution, porosity, wall thickness/skin layer, and single-skin layer structure regulation. and so on to optimize the membrane. However, the reduction in membrane wall thickness is not directly proportional to the increase in flux. On the one hand, the reduction of wall thickness can reduce the mass transfer resistance of the membrane, thereby increasing the flux, but on the other hand, the reduction of membrane wall thickness increases heat conduction, resulting in high heat loss and low transmembrane temperature difference, which in turn leads to a decrease in membrane flux. In addition, reducing the membrane wall thickness one-sidedly in order to obtain high flux can easily lead to a decrease in the yield of the membrane and the mechanical strength of the membrane filament, and it is easy to cause shriveled and broken filaments during actual operation, which seriously affects the service life of the membrane. In order to improve the hydrophobicity and membrane strength of the membrane, some researchers have implemented methods and means such as gel process control, blending of inorganic/polymer particles (CaCO3, TiO2, PTFE, etc.), and membrane functional modification. the

In order to improve the mass transfer efficiency of the membrane, the current optimization design of the membrane distillation module focuses on how to promote the generation of turbulent flow near the membrane surface and reduce the polarization phenomenon. This design trend has led the development direction of membrane group design to the development of curved surface, spiral or winding structures. To change the flow state, increase the flow velocity on the surface of the membrane, and generate vortex. The design of turbulent components in general raises many complex hydrodynamic problems. It should not be used in the design of large components, and because of the introduction of components, the pressure loss will increase and the loss of mechanical energy will increase. the

It can be seen that the preparation of membranes for membrane distillation should break through the traditional thinking of membrane production, and comprehensively consider the membrane production process and the optimal design of membrane distillation components. It is necessary to improve the strength of the hollow fiber membrane, but also to increase the flux of the membrane filament and the module. The spun hollow fiber membrane should have high strength, high flux, anti-fouling performance, and be suitable for the unique cleaning and drying steps of the membrane distillation process. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a method for preparing a hollow fiber membrane with spiral ribs and the rotary spinneret used, which overcomes the problem of reducing the thickness of the membrane wall in order to improve the membrane flux in the existing membrane development technology. , which leads to the problem of the decrease of the mechanical strength of the membrane, and in the actual operation process, the thin-walled membrane is easy to cause the phenomenon of shriveled and broken wires, which seriously affects the defects of the service life of the membrane. the

The technical scheme of the utility model for solving the above-mentioned technical problems is as follows: a spinneret for preparing hollow fiber membranes with reinforcing ribs, the spinneret includes a spinneret upper die, a spinneret lower die, a spinneret bottom plate and a drive motor ,

The upper mold of the spinneret is fixed on the equipment, and the upper mold of the spinneret is provided with a core liquid pipeline and an upper mold casting liquid channel. One end of the core fluid pipeline is a core liquid interface, and the other end is connected to a core needle. Inside the core needle is an inner gel liquid channel; one end of the casting liquid channel of the upper mold communicates with the casting liquid degassing tank;

The lower die of the spinneret is provided with the entrance of the casting fluid channel of the lower mold, the casting fluid channel of the lower mold and the exit of the casting fluid channel of the lower mold, and the casting fluid channel entrance of the lower mold is connected with the casting fluid channel of the upper mold. The other end of the channel is connected; the core needle is located in the casting liquid channel of the lower mold and is coaxial, the lower end of the core needle is the inner gel liquid outlet, and the inner gel liquid outlet is connected to the lower mold casting film The outlet of the liquid channel is flush;

The spinneret bottom plate is fixed to the bottom end of the upper mold of the spinneret, and a through hole is arranged on the spinneret base plate, and the position of the through hole is coaxial with the core needle and the casting liquid channel of the lower die. , the lower end of which is the outlet of the casting liquid, and the inner gel liquid and the casting liquid pass through the through hole at the same time; the inner wall of the casting liquid channel of the lower die of the spinneret is provided with a semicircular cross section groove; the drive motor is fixed on the motor base, the motor base is fixed on one side of the upper die of the spinneret, the motor shaft of the drive motor is provided with a motor shaft output gear, and the motor shaft outputs The gear meshes with the tooth disc on the lower die of the spinneret to drive the lower die of the spinneret to rotate. the

The beneficial effects of the utility model are: when the lower mold of the spinneret and the spinneret bottom plate constitute the lower mold assembly, the lower mold of the spinneret is driven to rotate by the output shaft of the motor, the upper mold of the spinneret, the lower mold of the spinneret The tightness between the die and the spinneret bottom plate is adjusted by elastic screws evenly distributed on the spinneret bottom plate. When the inner gel liquid and the casting solution in the core needle pass through the rotating spinneret lower mold at the same time, since the inner wall of the spinneret lower mold casting solution channel is provided with a groove with a semicircular cross-section along the axial direction, The outer wall of the hollow fiber membrane formed under the action of the inner and outer gel liquid can form a spiral rib, and the pitch of the rib can be controlled by the speed of the motor rotation, and the spiral rib can improve the mechanical strength of the hollow fiber membrane. . the

Further, the cross-section of the channel entrance of the casting solution of the lower mold is V-shaped. the

Further, the cross-section of the spinneret upper die is inverted L-shaped, and one end of the spinneret base plate and the spinneret upper die L-shaped is fixed by an elastic screw; the spinneret base plate and the spinneret lower die are passed Elastic screw fastening, used to adjust to ensure the sealing of the end face. the

The spinneret used for the hollow fiber membrane with the helix prepared by the utility model has the following advantages with the traditional linear hollow fiber membrane spinneret:

(1) Using the special-shaped rotary spinneret design, the hollow fiber membrane forms a spiral rib during the membrane forming process, increasing the compressive and tensile strength of the membrane filament. The strengthening effect of the reinforcing rib formed by physical method is obviously better than that of other chemical modification methods, and it also overcomes the disadvantage that the film and fiber of the reinforced fiber method are easy to detach. the

(2) Using the spiral ribs formed by the rotatable spinneret, in the actual operation process, the fluid flow state on the membrane surface is changed, and the turbulence of the fluid on the membrane surface is increased, which is beneficial to the improvement of the mass transfer and heat transfer efficiency of the membrane surface. The spiral hollow membrane can overcome the channeling effect of traditional components and prevent the disadvantages of complicated membrane filling process and easy damage of membrane filaments caused by the addition of grids in the flow channel and turbulent components such as surrounding fluids in traditional components. the

(3) The design of the spiral hollow membrane filament makes the fluid on the inner and outer surfaces of the membrane vortex, forming a secondary flow, effectively reducing the temperature and concentration polarization of the membrane surface, and reducing membrane fouling. the

(4) The existence of the hollow fiber membrane helical ribs is beneficial to overcome the adhesion phenomenon of the membrane during the cleaning and drying process of the membrane filament, which is beneficial to the long-term stable operation of the membrane, is conducive to rapid drying, and improves the service life of the membrane. the

Description of drawings

Fig. 1 is a kind of top view of the spinneret used on the equipment of the hollow fiber membrane of preparing band reinforcement;

Figure 2 is a schematic diagram of the structure in the direction of Figure 1A-A;

Fig. 3 is a kind of schematic diagram of embodiment of the first spinneret base plate in the spinneret used on the equipment of the hollow fiber membrane of a kind of preparation band reinforcement;

Fig. 4 is a kind of schematic diagram of embodiment of the second spinneret base plate in the spinneret used on the equipment of the hollow fiber membrane of a kind of preparation band reinforcement;

Fig. 5 is a hollow fiber membrane structure schematic diagram prepared by a method for preparing a hollow fiber membrane with reinforcing ribs using the first spinneret bottom plate;

Fig. 6 is a schematic diagram of the structure of a hollow fiber membrane prepared by a method for preparing a hollow fiber membrane with reinforcing ribs using the second spinneret bottom plate. the

In the accompanying drawings, the list of parts represented by each label is as follows:

5. Spinneret, 5-1, motor output gear, 5-2, core liquid pipe joint, 5-3, upper die of spinneret, 5-4, core needle, 5-5, motor seat, 5-6 , motor, 5-7, spinneret bottom plate, 5-8, through hole, 5-9, spinneret lower mold, 5-10, lower mold casting liquid channel inlet, 5-11, lower mold casting liquid channel , 5-12, the core fluid pipeline, 5-13, a groove with a semicircular cross section, 5-14, elastic screw, 5-15, elastic screw. the

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model. the

As shown in Fig. 1 to Fig. 4, a kind of spinneret 5 that the present invention prepares the equipment of the hollow fiber membrane of reinforcing rib, a kind of spinneret that prepares the equipment of the hollow fiber membrane of band helix reinforcing rib, Described spinneret comprises spinneret upper die 5-3, spinneret lower die 5-9, spinneret bottom plate 5-7 and driving motor 5-6,

The upper die 5-3 of the spinneret is fixed on the equipment, and the upper die 5-3 of the spinneret is provided with a core liquid pipeline 5-12 and an upper mold casting liquid channel, and the core liquid pipeline 5-12 One end is a core liquid interface, the other end is connected to the core needle 5-4, and the inside of the core needle 5-4 is an inner gel liquid; one end of the casting liquid channel of the upper mold is connected to the casting liquid degassing tank 2; the core liquid The other end of the pipeline 5-12 is connected to the core liquid pipe joint 5-2. the

Described spinneret lower mold 5-9 is provided with lower mold film casting liquid channel inlet, lower mold film casting liquid channel 5-11 and lower mold film casting liquid channel outlet, and described lower mold film casting liquid channel entrance is connected with all The other end of the upper mold casting solution channel 5-11 is connected; the core needle 5-4 is located in the lower mold casting solution channel 5-11 and is coaxial, and the lower end of the core needle 5-4 is an internal condensation The outlet of the glue solution, the outlet of the internal gel solution is flush with the outlet of the casting solution channel 5-11 of the lower mold; the upper end of the core needle 5-4 communicates with the core solution pipeline 5-12. the

The spinneret bottom plate 5-7 is fixed on the bottom end of the spinneret upper die 5-3, and the spinneret base plate 5-7 is provided with a through hole 5-8, and the position of the through hole 5-8 is in line with the position of the spinneret. The core needle 5-4 and the casting liquid channel 5-11 of the lower mold are coaxial, and the lower end thereof is the casting liquid outlet, and the inner gel liquid and the casting liquid pass through the through hole 5-8 at the same time; The inner wall of the casting liquid channel 5-11 of the lower mold of the spinneret is provided with a groove 5-13 with a semicircular cross-section along the axial direction; the driving motor 5-6 is fixed on the motor base 5-5, The motor base 5-5 is fixed on one side of the spinneret upper die 5-3, the motor shaft of the drive motor 5-6 is provided with a motor shaft output gear, and the spinneret lower die 5-9 A toothed plate is installed on the top, and the output gear of the motor shaft meshes with the toothed plate on the lower die of the spinneret to drive the lower die of the spinneret to rotate. the

As shown in Figure 3 and Figure 4, the schematic cross-sectional view of the casting liquid channel of the lower die of the spinneret, the inner wall of the casting liquid channel of the lower die of the spinneret has two grooves with a semicircular section along the axial direction. or 3. the

The further technical solution of the present invention is that the spinnerets used in the above-mentioned equipment for preparing hollow fiber membranes with reinforcing ribs have the same basic structure, and the further improvement is that the cross section of the entrance of the casting liquid channel of the lower mold is V-shaped. type. the

The further technical solution of the present invention is that the spinnerets used in the above-mentioned equipment for preparing hollow fiber membranes with reinforcing ribs have the same basic structure, and the further improvement is that the number of semicircular grooves is 2-5, uniform Distributed on the inner wall of the casting liquid channel of the lower mold of the spinneret. the

The cross-section of the upper die of the spinneret is inverted L-shaped, and one end of the L-shaped end of the upper die of the spinneret and the upper die of the spinneret is fixed by elastic screws 5-14; It is tightened by elastic screws 5-15, which are used to adjust and ensure the sealing of the end face. the

As shown in Figure 5 and Figure 6, the hollow fiber membrane with reinforcing ribs prepared by the spinneret of the present invention. the

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models. the

Claims (3)

1. one kind prepares band reinforcement hollow-fibre membrane spinning head, it is characterized in that described spinning head comprises spinning head patrix, spinning head counterdie, spray silk base plate and drive motors,

Described spinning head patrix is fixed on the equipment, and described spinning head patrix is provided with core liquid pipeline and patrix casting solution passage, and described core liquid pipeline one end is core liquid interface, and the other end is communicated with the core pin, is inner gel liquid passage in the core pin; Described patrix casting solution passage one end is communicated with the casting solution degassing tank;

Described spinning head counterdie is provided with counterdie casting solution feeder connection, counterdie casting solution passage and counterdie casting solution channel outlet, and described counterdie casting solution feeder connection is communicated with the described patrix casting solution passage other end; Described core pin is positioned at described counterdie casting solution passage and concentric, and described core pin lower end is the outlet of inner gel liquid, and described inner gel liquid outlet is concordant with described counterdie casting solution channel outlet;

Described spray silk base plate and described spinning head patrix bottom are fixed, described spray silk base plate is provided with through hole, described lead to the hole site and described core pin and described counterdie casting solution passage concentric, its lower end are the casting solution outlet, and described inner gel liquid and casting solution are simultaneously by described through hole; It is semicircular groove that the inwall of described spinning head counterdie casting solution passage in axial direction is provided with the cross section; Described drive motors is fixed on the motor cabinet, described motor cabinet is fixed on described spinning head patrix one side, the motor shaft of described drive motors is provided with the motor shaft output gear, and the fluted disc on described motor shaft output gear and the described spinning head counterdie is meshing with each other, and drives described spinning head counterdie rotation.

2. according to the described a kind of preparation band reinforcement hollow-fibre membrane spinning head of claim 1, it is characterized in that the cross section of described counterdie casting solution feeder connection is V-shape.

3. according to the described a kind of preparation band reinforcement hollow-fibre membrane spinning head of claim 1, it is characterized in that the cross section of described spinning head patrix is inverted L shape, an end of described spray silk base plate and spinning head patrix L type is fixed by the elasticity screw; Fastening by the elasticity screw between described spray silk base plate and the spinning head counterdie, be used for regulating the assurance end face seal.

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