Membrane casting solution mixing and constant-pressure feeding system

Abstract

The utility model discloses a membrane casting liquid mixing and constant-pressure feeding system, which comprises a stirring tank, a feeding device, a feeding device, a feeding device and a control device, and is characterized in that the stirring tank comprises a tank cover, a tank body, a stirrer and an emulsifier; the constant-pressure feeding system comprises a discharging valve, a gear pump, a filtering device, a constant-pressure control device and a feeding valve which are sequentially connected with a discharging opening of the stirring tank through a feeding pipeline; the feed liquid external circulation system comprises a discharge valve, a gear pump and a backflow valve which are connected in sequence, one end of the circulation pipeline is connected with the discharge port of the stirring tank, the other end of the circulation pipeline is connected with the membrane casting liquid backflow port, and the circulation pipeline is provided with a heating sleeve; the utility model solves the problems of poorer mixing and poor temperature control of the membrane casting solution, improves the mixing uniformity and mixing efficiency of the membrane casting solution, can supply and convey materials at constant pressure, ensures that the supplied materials of rear-end production equipment are stable, and further improves the performance of membrane products.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic filter membrane production equipment technical field, specifically, relate to a casting membrane liquid mixing and constant pressure feed system. BACKGROUND

[0002] Organic filter membrane is famous for its high porosity, high flow, stability, aging resistance, long life, excellent surface performance, anti-pollution ability and easy cleaning, and is widely used in many fields, especially in water purification and sewage treatment. In the preparation process of organic filter membrane, the casting solution containing different components is first mixed, and the mixing process is usually completed by using a stirring tank, but the existing stirring tank only rotates in the horizontal direction when mixing, and then drives the flow of the casting solution. When the rotating speed of the stirring device is too fast and the amplitude of the casting solution flow is the same, the liquid is easy to flow synchronously with the stirring device, and it is difficult to mix uniformly, which affects the performance of the subsequent filter membrane product.

[0003] In addition, the traditional stirring equipment only circulates water through the external jacket of the stirring tank for heating or cooling, which can only quickly heat and cool the raw materials close to the outer wall, and the conduction of the raw materials in the stirring tank is slow, and the heating effect of the casting solution is not good, which is not conducive to the temperature control in the stirring tank.

[0004] During the pipeline transportation of the casting solution, the friction between the casting solution and the pipeline wall and the internal friction between the casting solution molecules will cause pressure loss during transportation. The pressure loss may cause changes in flow rate and flow in the pipeline, affecting the stability of the system, and thus affecting the stability of the incoming material of the downstream production equipment and the performance of the membrane product. SUMMARY

[0005] Technical problem: The technical problem to be solved by the utility model is to provide a casting solution mixing and constant pressure feed system to solve the problems of poor casting solution mixing and poor temperature control, improve the uniformity and mixing efficiency of the casting solution mixing, and simultaneously realize constant pressure feed and transportation to ensure the stability of the incoming material of the downstream production equipment and further improve the performance of the membrane product.

[0006] Technical scheme: To solve the above technical problems, the utility model embodiment adopts the technical scheme of a casting solution mixing and constant pressure feed system, which comprises:

[0007] The stirring tank comprises a tank cover, a tank body, a stirrer and an emulsifier, the tank cover and the tank body are fixed by a sealing strip and bolts to form a closed reaction cavity inside, the tank cover is provided with a stirrer mounting port, an emulsifier mounting port, a feeding port and a casting solution backflow port, the stirring rods of the stirrer and the emulsifier are connected with motors respectively, the stirring ends pass through the tank cover and extend into the cavity through the stirrer mounting port and the emulsifier mounting port, and the stirring rods are stirred and emulsified in the tank body under the driving of the motors; the tank body is provided with a temperature control device outside to provide the required temperature for the tank body, and the tank body is provided with a discharge port at the bottom;

[0008] The constant pressure feeding system comprises a discharge valve, a gear pump, a filtering device, a constant pressure control device and a feeding valve, which are connected in sequence (i.e. connected head to tail, connected in series, and connected in sequence one by one) with the discharge port of the stirring tank through a feeding pipeline; the constant pressure control device is connected with a servo motor to control the pressure in the circulating pipeline and the feeding pipeline.

[0009] The liquid external circulation system comprises a discharge valve, a gear pump and a backflow valve connected in sequence, the discharge valve, the gear pump and the backflow valve are connected through a circulating pipeline, one end of the circulating pipeline is connected with the discharge port of the stirring tank, and the other end is connected with the casting solution backflow port, and the circulating pipeline is provided with a heating jacket; the casting solution in the stirring tank flows out from the discharge port, flows into the stirring tank from the casting solution backflow port through the circulating pipeline, realizes the mixing of the casting solution in the vertical direction, makes the mixing of the casting solution more uniform, and enables the casting solution to be heated in the circulating pipeline, so that the casting solution is heated more uniformly and the temperature in the stirring tank is further controlled.

[0010] Further, generally, the constant pressure feeding system and the liquid external circulation system are two independent systems, to optimize the pipeline design, the constant pressure feeding system and the liquid external circulation system can share the discharge valve, the gear pump and the interval pipeline parts thereof.

[0011] Further, in order to control the pressure in the stirrer, the tank cover is provided with an air inlet, an air outlet and a pressure gauge interface, which are connected with an air inlet pipe, an air outlet pipe and a pressure gauge respectively, to adjust the pressure in the stirring tank.

[0012] Further, the emulsifier is a high-speed shearing dispersion emulsifier, which comprises an emulsifying stirring rod, the head of the emulsifying stirring rod is provided with a circular blade, the high-speed shearing dispersion emulsifier can effectively prevent the agglomeration phenomenon of the high-molecular polymer during dissolution, and the heat generated by the high-speed operation of the high-speed shearing dispersion emulsifier can heat the casting solution.

[0013] Further, the temperature control device is a jacket, that is, a cavity is formed between the jacket and the tank body, hot water or heat conducting oil is introduced into the cavity to control the temperature of the tank body, the cavity is provided with an inlet and an outlet, the hot water or heat conducting oil enters the cavity through the inlet and is discharged from the outlet to provide circulating heat for the tank body.

[0014] Further, the stirrer is an anchor stirrer, and the anchor stirrer comprises a stirring rod and a stirring paddle, and the stirring rod and the stirring paddle are connected through a shaft sleeve.

[0015] Further, a soft scraping strip is arranged on the outer circle of the stirring paddle, the soft scraping strip is in frictional contact with the inside of the stirring tank body, the casting solution adhered to the inner wall of the stirring tank can be scraped off, and the adhesion and accumulation of the casting solution on the inner wall of the stirring tank are reduced.

[0016] Further, the feeding port is a visual feeding port, and the stirring condition of the casting solution in the stirring tank can be directly observed.

[0017] Further, a baffle is arranged on the stirring rod in the stirring tank, and the climbing of the casting solution on the stirring rod during stirring is prevented.

[0018] The utility model can be used for the casting solution configuration of organic high polymer film, especially the strong corrosive chemical solvent system containing chemical solvents such as dimethylformamide, dimethylacetamide and dimethyl sulfoxide, and is especially suitable for the casting solution configuration and mixing of polyvinylidene fluoride, polyether sulfone and polysulfone high polymer film materials.

[0019] Beneficial effects: compared with the prior art, the technical scheme of the utility model has the following beneficial effects: the utility model utilizes the stirrer to realize the horizontal uniform mixing of the casting solution in the stirring tank, utilizes the emulsifier to prevent the agglomeration of high polymer, and under the double action of the stirrer and the emulsifier, the mixing effect and efficiency of the casting solution are improved.

[0020] The utility model increases the external circulation system, can realize the circulation flow of the casting solution in the stirring tank in the vertical direction on one hand, improves the mixing effect and efficiency, and on the other hand, can heat in the circulation process, the casting solution is heated uniformly in the circulation pipeline, and the temperature of the casting solution in the stirring tank is more effectively controlled.

[0021] The utility model increases the constant pressure control system, can keep the pressure in the pipeline stable when feeding and circulating, can realize the uniform speed conveying of the casting solution, guarantees the stable incoming material of the rear end film silk production equipment, and improves product performance. DRAWINGS

[0022] Figure 1 It is the structural schematic diagram of the utility model.

[0023] Figure 2It is the stirring tank structure schematic diagram of the utility model.

[0024] Figure 3 It is the stirring tank cover structure schematic diagram (top view) of the utility model.

[0025] In the figure, there are: 1, tank cover;2, tank body;3, stirrer;4, emulsifier;5, pressure gauge;6, sealing strip;7, bolt;8, discharge valve 1;9, gear pump;10, backflow valve;11, filtering device;12, constant pressure control device;13, feed valve;14: scraping strip;15, baffle;16, temperature control device;17, stirring paddle;18, emulsification stirring rod;19, stirring rod;20, charging port;21, pressure gauge interface;22, casting fluid backflow port;23, emulsification device port;24, exhaust port;25, stirring device port;26, air inlet;27, circulating pipeline;28, discharge port. Specific implementation

[0026] The technical scheme of the utility model will be explained in detail below with reference to the drawings.

[0027] As Figures 1-3 A casting fluid mixing and constant pressure feeding system, comprising:

[0028] The stirring tank comprises a tank cover 1, a tank body 2, a stirrer 3 and an emulsifier 4, the tank cover 1 and the tank body 2 are fixed by a sealing strip 6 and a bolt 7 to form an enclosed reaction cavity inside, the tank cover 1 is provided with a stirrer mounting port 25, an emulsifier mounting port 23, a charging port 20 and a casting fluid backflow port 22, the charging port is provided as a mirror surface visual charging port, so that the stirring condition of the casting fluid in the stirring tank can be observed at any time.

[0029] The stirring rods of the stirrer and the emulsifier are connected with a motor, the stirring end penetrates the tank cover and extends into the cavity through the mounting port, the stirring rod of the emulsifier is driven by the motor to stir and emulsify in the tank body;The tank body is provided with a temperature control device 16 outside, which provides the required temperature for the reaction of the tank body, and the tank body is provided with a discharge port 28 at the bottom.

[0030] The high-speed variable frequency motor of the emulsifier can reach a speed of 1000-5000 revolutions per minute, which is used for high-speed cutting of high polymer powder and accelerates the dissolution of the powder.

[0031] The tank body 2 is provided with a temperature control device 16, which can be selected from electric heating, water bath heating, oil bath heating and the like, preferably cavity jacket water bath or oil bath heating, that is, a cavity is formed between the jacket and the tank body, hot water or heat conducting oil is introduced into the cavity to control the temperature of the tank body.

[0032] The emulsifier 3 is a high-speed shearing dispersion emulsifier, comprising an emulsifying stirring rod 18 with a circular blade at the head, which is driven by a motor to high-speed shear and disperse the high polymer powder, prevent the agglomeration of the high polymer solvent, and the heat generated by the high-speed operation can heat the casting solution, which can make the mixing of the casting solution more uniform and heat the casting solution to make the temperature of the casting solution in the stirring tank more uniform.

[0033] Further, the tank cover is provided with an air inlet 26, an air outlet 24 and a pressure gauge interface 21, which are connected with the air inlet pipe, the air outlet pipe and the pressure gauge respectively, for controlling the pressure in the stirring tank.

[0034] Further, the stirrer 4 is an anchor stirrer, comprising a stirring rod 19 and a stirring paddle 17, which are connected through a shaft sleeve. The stirring paddle 17 is provided with a soft scraping strip 14 at the outer circle, which is in frictional contact with the inside of the stirring tank body, can scrape the casting solution adhered to the inner wall of the stirring tank, and reduce the adhesion and accumulation of the casting solution on the inner wall of the stirring tank. The soft scraping strip 14 can be made of rubber, silicone, plastic or the like, preferably a fluorine scraping strip.

[0035] It also comprises a constant pressure feeding system, comprising a discharge valve 8, a gear pump 9, a filter device 11, a constant pressure control device 12 and a feeding valve 13, which are connected with the discharge outlet 28 of the stirring tank in sequence through the feeding pipeline; the constant pressure control device 12 is connected with a servo motor, for controlling the pressure in the circulating pipeline 27 and the feeding pipeline, and the pipeline pressure is set in the range of 0.2-1MPa; the filter device is preferably a Y-type filter; the gear pump 9 adopts metal sealing and has a self-priming function;

[0036] It also comprises a liquid external circulation system, comprising a discharge valve 8, a gear pump 9 and a backflow valve 10 connected in sequence, which are connected through the circulating pipeline 27, one end of which is connected with the discharge outlet 28 of the stirring tank and the other end is connected with the casting solution backflow port 22, and the circulating pipeline 27 is provided with a heating jacket; the casting solution in the stirring tank flows out from the discharge outlet 28, circulates into the stirring tank from the casting solution backflow port 22 through the circulating pipeline 27, realizes the mixing of the casting solution in the vertical direction, makes the mixing more uniform, and can complete the heating in the circulating pipeline, further maintaining the temperature in the stirring tank;

[0037] Further, the stirring tank is provided with a baffle 15 on the stirring rod, for preventing the casting solution from climbing up during stirring.

[0038] Further, the constant pressure feeding system and the liquid outside circulation system can share the discharge valve, the gear pump and the interval pipeline part (such as Figure 1 ), and the constant pressure feeding system and the liquid outside circulation system can also be two independent pipelines.

[0039] The utility model can be used for the casting solution configuration of organic polymer film, especially in the strong corrosive chemical solvent system containing chemical solvent dimethylformamide, dimethylacetamide, dimethyl sulfoxide and the like, and is particularly suitable for the casting solution configuration and mixing of polyvinylidene fluoride, polyether sulfone, polysulfone and other polymer film materials.

[0040] The basic principle, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above specific embodiments, and the above specific embodiments and the description in the specification are only for further illustrating the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and all the changes and improvements fall within the scope of the utility model claimed. The scope of the utility model claimed is defined by the claims and their equivalents.

Claims

1. A casting solution mixing and constant pressure feeding system, characterized in that, It includes: The stirring tank includes tank cover (1), tank body (2), stirrer (3) and emulsifier (4), the tank cover (1) and tank body (2) are fixed by sealing strip (6) and bolt (7), and the inside constitutes a closed reaction cavity, the tank cover (1) is equipped with stirrer installation port (25), emulsifier installation port (23), feeding port (20) and casting film liquid backflow port (22), the stirrer (3) and emulsifier (4) are connected with motor respectively, and the stirring end is respectively through installation port and passes through tank cover (1) and extends into the reaction cavity inside, is stirred under the driving of motor in tank body, and emulsification effect is carried out;The outer layer of the tank body (2) is equipped with temperature control device (16), provides the temperature required for the reaction of tank body (2), and the bottom of the tank body (2) is equipped with discharge port (28); Constant pressure feeding system, including discharge valve (8), gear pump (9), filtering device (11), constant pressure control device (12), feeding valve (13), the discharge valve (8), gear pump (9), filtering device (11), constant pressure control device (12), feeding valve (13) are sequentially connected with the discharge port (28) of stirring tank through feeding pipeline;The constant pressure control device (12) is connected with servo motor, and is used for controlling the pressure in circulating pipeline and feeding pipeline; Liquid external circulation system, including sequentially connected discharge valve (8), gear pump (9), backflow valve (10), the discharge valve (8), gear pump (9), backflow valve (10) are connected through circulating pipeline (27), one end of the circulating pipeline (27) is connected with the discharge port (28) of stirring tank, and one end is connected with casting film liquid backflow port (22), the circulating pipeline (27) is equipped with heating jacket;The casting film liquid in the stirring tank flows out from the discharge port (28), and is circulated into the stirring tank from the casting film liquid backflow port (22) through the circulating pipeline (27), realizes the mixing of casting film liquid in the vertical direction, makes the mixing more uniform, can complete heating in the circulating pipeline (27) simultaneously, makes the heating of casting film liquid more uniform, further controls the temperature in the stirring tank.

2. The casting solution mixing and constant pressure feeding system according to claim 1, wherein The emulsifier is high-speed shearing dispersion emulsifier, and includes emulsification stirring rod (18), and the head of emulsification stirring rod (18) is provided with circular blade, the high-speed shearing dispersion emulsifier can effectively prevent the agglomeration of high molecular polymer when dissolving, and the heat generated by the high-speed operation of the high-speed shearing dispersion emulsifier can heat the casting film liquid.

3. The casting solution mixing and constant pressure feeding system according to claim 1, wherein The temperature control device (16) is a jacket, that is, a cavity is formed between the jacket and the tank body, and hot water or heat conducting oil is introduced into the cavity to control the temperature of the tank body.

4. The casting solution mixing and constant pressure feeding system according to claim 1, wherein The stirrer is anchor type stirrer, and the anchor type stirrer includes stirring rod (19) and stirring paddle (17), and the stirring rod (19) and stirring paddle (17) are connected through shaft sleeve.

5. The casting solution mixing and constant pressure feed system of claim 4, wherein, The outer circle of the stirring paddle (17) is provided with soft scraping strip (14), and the soft scraping strip is in friction contact with the inside of the stirring tank body.

6. The casting solution mixing and constant pressure feeding system of claim 1, wherein The feeding port (20) is visual feeding port.

7. The casting solution mixing and constant pressure feeding system of claim 1, wherein The baffle (15) is arranged on the stirring rod in the stirring tank, to prevent the casting film liquid from climbing when stirring.

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