Polyvinylidene fluoride foam feed liquid conveying device

Abstract

The utility model discloses a polyvinylidene fluoride foam feed liquid conveying device which comprises a support, a filtering box body is arranged on the support, a vertical discharging pipe is arranged at the top of the filtering box body, the lower end of the discharging pipe is connected with a feeding port formed in the top of the filtering box body in a sealed mode, a filter is arranged in the filtering box body, and a collecting hopper is arranged below the filter. A discharge pipe is arranged at the lower end of the collection hopper, a mounting hole is formed in the bottom of the filtering box body, the discharge pipe penetrates through the mounting hole and is hermetically connected with the mounting hole, the upper end of the discharge pipe is connected with a discharge port of the collection hopper, the lower end of the discharge pipe is connected with a screw pump arranged below the filtering box body, and a discharge port of the screw pump is connected with a conveying pipeline. According to the utility model, foams in the feed liquid can be separated and then conveyed, so that the demulsification risk is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of polyvinylidene fluoride (PVDF) production equipment, and in particular to a PVDF foam liquid conveying device. Background Technology

[0002] PVDF (polyvinylidene fluoride) is a fluorinated functional resin material with excellent chemical stability, electrical insulation properties, and superior weather resistance. It is widely used in petrochemical, electronics, and fluorocarbon coatings industries. PVDF is produced by polymerizing VDF (vinylidene fluoride), and the polymerization process is divided into two main categories: emulsion polymerization and suspension polymerization. Given the advantages of emulsion polymerization, such as high efficiency and low cost, the market currently mainly focuses on emulsion-polymerized products.

[0003] Currently, the process of producing PVDF (polyvinylidene fluoride) from VDF (vinylidene fluoride) emulsion polymerization involves a stirring process, which generates a lot of foam in the polymerization reactor. When conveying liquid containing a lot of large foam, the pressure of the liquid is unstable during the conveying process, which exacerbates demulsification and reduces the conveying efficiency of the pipeline. Utility Model Content

[0004] This invention provides a polyvinylidene fluoride (PVDF) foam liquid conveying device, which solves the problems of excessive foam generation during the traditional VDF (vinylidene fluoride) emulsion polymerization to PVDF (polyvinylidene fluoride) production process, which easily leads to unstable pressure during liquid conveying, exacerbates demulsification, and reduces the conveying efficiency of the pipeline.

[0005] This utility model provides a polyvinylidene fluoride (PVDF) foam liquid conveying device, including a support frame, a filter box mounted on the support frame, a vertical discharge pipe at the top of the filter box, the lower end of the discharge pipe being sealed to the inlet at the top of the filter box, a filter inside the filter box, a collection hopper below the filter, a discharge pipe at the lower end of the collection hopper, an installation hole at the bottom of the filter box, the discharge pipe passing through the installation hole and being sealed to the installation hole, the upper end of the discharge pipe being connected to the discharge port of the collection hopper, and the lower end of the discharge pipe being connected to a screw pump located below the filter box, the discharge port of the screw pump being connected to a conveying pipeline.

[0006] In the above technical solution, the filter is further defined as a cone shape, and multiple axially distributed filter holes are provided on the cone surface of the filter along the circumferential direction.

[0007] In the above technical solution, preferably, multiple annular spray pipes are concentrically arranged at the top of the filter box, and each annular spray pipe is connected by a radially arranged connecting pipe. The connecting pipe is connected to a booster pump arranged outside the filter box through a first pipe, and the booster pump is connected to the outlet of the pure water tank through a second pipe. Each annular spray pipe has a spray port at its bottom and is connected to a nozzle.

[0008] In the above technical solution, a control valve is further provided at the lower end of the discharge pipe, and the control valve is sealed to the feed port of the screw pump through a pipeline.

[0009] In the above technical solution, preferably, a spiral shaft is coaxially arranged inside the feeding pipe, a spiral blade is arranged on the spiral shaft, the spiral blade is fixedly sleeved on the spiral shaft, and the outer edge of the spiral blade is sealed and fixedly connected to the inner wall of the feeding pipe.

[0010] In the above technical solution, a vent is further provided on the side wall of the filter box, and the outer end of the vent is connected to a vent pipe.

[0011] In the above technical solution, preferably, an annular boss is provided on the conical side of the filter along the circumferential direction.

[0012] In the above technical solution, preferably, the top of the filter is set as a flat top, a horizontal fixing plate is set on the flat top, and multiple vertical poles are arranged in an array on the fixing plate, with a conical tip at the upper end of each pole.

[0013] As can be seen from the above technical solutions, this utility model provides a polyvinylidene fluoride foam liquid conveying device.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. By connecting the feed pipe to the discharge port of the polymerization reactor, the liquid in the polymerization reactor is introduced into the filter box. After being dispersed and filtered by the filter inside the filter box, the liquid and foam in the foam liquid are separated. The foam is trapped in the filter box, while the emulsion passes through the filter and enters the collection hopper. The emulsion is collected by the collection hopper and then introduced into the discharge pipe. It is then transported to the screw pump through the discharge pipe. After being pressurized by the screw pump, it is transported over a long distance at high pressure along the conveying pipeline. This reduces the risk of demulsification during the conveying of the foam emulsion and increases the conveying efficiency.

[0016] 2. After the pure water in the external pure water tank is drawn by the booster pump, it is pressurized and delivered to the connecting pipe and each ring spray pipe. The filter is cleaned by spraying water downward through the nozzles to prevent the filter from clogging.

[0017] 3. The spiral blades and spiral shaft guide the liquid entering the feed pipe to descend in a spiral shape along the spiral blades, preventing demulsification caused by tumbling during the discharge process, and also preventing the liquid from falling directly from the top of the feed pipe to the bottom, thus preventing more foam from being generated. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a polyvinylidene fluoride foam liquid conveying device proposed in this utility model.

[0020] Figure 2 This is a cross-sectional view of the internal structure of a polyvinylidene fluoride foam liquid conveying device proposed in this utility model;

[0021] Figure 3 Appendix to this utility model Figure 2 A partially enlarged structural diagram of position I;

[0022] Figure 4 Appendix to this utility model Figure 2 A magnified schematic diagram of the structure at position II.

[0023] In the picture:

[0024] 1-Staff;

[0025] 2-Filter box; 21-First pipe; 22-Annular spray pipe; 23-Connecting pipe; 24-Sprayer head; 25-Foam drain pipe;

[0026] 3-Feeding pipe; 31-Screw shaft; 32-Screw blade;

[0027] 4-Filter; 41-Filter hole; 42-Annular boss; 43-Fixing plate; 44-Upright pole;

[0028] 5-Collecting hopper;

[0029] 6-Discharge pipe; 61-Control valve;

[0030] 7-Screw pump;

[0031] 8-Transportation pipeline;

[0032] 9-Observation window. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] Example 1:

[0035] See Figure 1-4 A polyvinylidene fluoride (PVDF) foam liquid conveying device includes a support frame 1, a filter box 2 mounted on the support frame 1, a vertical discharge pipe 3 mounted on the top of the filter box 2, the lower end of the discharge pipe 3 being sealed to the inlet mounted on the top of the filter box 2, a filter 4 mounted inside the filter box 2, a collection hopper 5 mounted below the filter 4, the bottom of the filter 4 being fixedly connected to the top of the collection hopper 5, a vertical discharge pipe 6 being fixedly connected to the lower end of the collection hopper 5, an installation hole 21 mounted on the bottom of the filter box 2, the discharge pipe passing through the installation hole 21 and being sealed to the installation hole, the upper end of the discharge pipe 6 being connected to the discharge port of the collection hopper 5, and the lower end of the discharge pipe being connected to a screw pump 7 mounted below the filter box 2, the discharge port of the screw pump 7 being connected to a conveying pipe 8.

[0036] Please refer to the above embodiments. Figure 1 The support 1 consists of three legs, which are vertically fixed to the bottom of the filter box 2, allowing the filter box 2 to be suspended and supported. The filter box 2 is a cylindrical structure. The feed pipe 3 is vertically set at the top of the filter box 2. The lower end of the feed pipe 3 extends into the filter box 2 through the feed inlet set at the top of the filter box 2 to prevent the liquid from accumulating at the top of the filter box 2. The upper end of the feed pipe 3 is connected to the discharge port of the polymerization reactor, which introduces the liquid in the polymerization reactor into the filter box 2. After being dispersed and filtered by the filter 4 inside the filter box 2, the liquid in the foam liquid is separated from the foam. The foam is trapped in the filter box 2, while the emulsion passes through the filter 4 and enters the collection hopper 5. The emulsion is collected by the collection hopper 5 and then introduced into the discharge pipe. It is then transported to the screw pump 7 through the discharge pipe. After being pressurized by the screw pump 7, it is transported over a long distance at high pressure along the conveying pipeline 8. During the transportation process, the risk of demulsification of the foam emulsion is reduced and the transportation efficiency is increased.

[0037] Please refer to the above embodiments. Figure 2Specifically, the filter 4 is conical in shape and is coaxially arranged inside the filter housing 2. Multiple vertically penetrating filter holes 41 are arranged along the circumferential direction on the conical side of the filter 4. The multiple filter holes 41 are distributed vertically, and the diameter of each filter hole 41 is 0.35mm. The foam emulsion is released onto the filter 4 through the feed pipe 3. Through the conical structure of the filter 4, the foam emulsion is dispersed on the conical sidewall of the filter 4. The emulsion flows downward through the filter holes 41, and the foam is filtered by the filter holes 41 and distributed on the conical sidewall of the filter 4. When too much foam accumulates on the sidewall of the filter 4, the foam can flow downward along the conical sidewall of the filter 4 and fall to the bottom of the filter housing 2.

[0038] Please refer to the above embodiments. Figure 2 , 3 Multiple annular spray pipes 22 are concentrically and coaxially arranged at the top of the filter box 2. The side wall of each annular spray pipe 22 is fixedly connected to the top of the filter box 2. The annular spray pipes 22 are interconnected by radially arranged connecting pipes 23. The connecting pipes 23 are connected to a booster pump set outside the filter box 2 through a first pipe 21. The booster pump is connected to the outlet of the pure water tank through a second pipe. Each annular spray pipe 22 has a spray nozzle at the bottom and is connected to a nozzle 24. The booster pump draws pure water from the external pure water tank, pressurizes it, and delivers it to the connecting pipes 23 and each annular spray pipe 22. The nozzles 24 spray downwards to clean the filter 4.

[0039] Please refer to the above embodiments. Figure 2 A control valve 61 is installed at the lower end of the discharge pipe 6. The lower end of the control valve 61 is sealed to the feed port of the screw pump 7 through a flange, bolts, and sealing ring. The upper end is connected to the discharge pipe 6 through a flange interface. The flow rate of the liquid entering the screw pump 7 can be controlled by the control valve 61.

[0040] Please refer to the above embodiments. Figure 2 A spiral shaft 31 is coaxially arranged inside the feed pipe 3, and a spiral blade 32 is arranged on the spiral shaft 31. The spiral blade 32 is fixedly sleeved on the spiral shaft 31, and the outer edge of the spiral blade 32 is sealed and fixed to the inner wall of the feed pipe 3. The liquid material entering the feed pipe 3 can be guided to descend in a spiral shape along the spiral blade 32 through the spiral blade 32 and the spiral shaft 31, which prevents the liquid material from falling and breaking emulsion during the discharge process, and at the same time prevents the liquid material from falling directly from the upper end of the feed pipe 3 to the lower end and generating more foam.

[0041] Please refer to the above embodiments. Figure 1 , 2 A foam discharge port is fixedly connected to the side wall of the filter box 2, and a foam discharge pipe 25 is connected to the outer end of the foam discharge port. The foam discharge pipe 25 can discharge the foam at the bottom of the filter box 2 for collection, so that it can automatically defoam.

[0042] Please refer to the above embodiments. Figure 2 , 4 An annular protrusion 42 is fixedly provided on the conical side of the filter 4 along the circumferential direction. The annular protrusion 42 facilitates the interception of emulsion on the conical side of the filter 4 that has not passed through the filter hole 41 in time, thereby prolonging its residence time on the side wall of the filter 4 and enabling the emulsion to completely pass through the filter hole 41.

[0043] Please refer to the above embodiments. Figure 2 The top of the filter 4 is set as a flat top, and a horizontal fixing plate 43 is fixedly installed on the flat top. Multiple vertical poles 44 are arranged in an array on the fixing plate 43. The upper end of the pole 44 is provided with a conical tip. The conical tip of the pole 44 facilitates the elimination of foam in the released foam liquid, causing some foam to be punctured and reducing the foam in the liquid.

[0044] Please refer to the above embodiments. Figure 1 An inspection port is provided on the side wall of the filter box 2, and an observation window 9 is provided on the inspection port. The observation window 9 makes it easy to observe whether the filter 4 inside the filter box 2 is clogged, and the foam intercepted by the filter 4 can be manually cleaned by opening the observation window 9.

[0045] In the above embodiments, the screw pump 7 is a commercially available device. The working principle of the screw pump 7 is to draw in emulsion and send the drawn-in emulsion into the delivery pipe 8 to discharge the liquid by relying on the volume change of the sealed cavity formed by the screw and the bushing.

[0046] The working principle of this utility model is as follows:

[0047] The polymerization reactor releases the foam liquid into the feed pipe 3. The liquid entering the feed pipe 3 is guided by the spiral blades 32 and the spiral shaft 31 to descend in a spiral shape along the spiral blades 32, preventing demulsification during the discharge process. The descending liquid is introduced into the filter box 2 through the feed pipe 3. After being dispersed and filtered by the conical surface of the filter 4 inside the filter box 2, the liquid and foam in the foam liquid are separated. The foam is trapped in the filter box 2, while the emulsion passes through the filter 4 and enters the collection hopper 5. The emulsion is collected in the collection hopper 5 and then introduced into the discharge pipe. It is then transported to the screw pump 7 through the discharge pipe. After being pressurized by the screw pump 7, it is transported over a long distance at high pressure along the conveying pipeline 8. When too much foam accumulates on the side wall of the filter 4, the foam can flow down along the conical side wall of the filter 4, fall to the bottom of the filter box 2, and be discharged and collected through the foam discharge pipe 25, so that the foam is automatically defoamed.

[0048] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0049] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A polyvinylidene fluoride foam liquid conveying device, comprising a support frame (1), characterized in that: A filter box (2) is provided on the bracket (1). A vertical feed pipe (3) is provided on the top of the filter box (2). The lower end of the feed pipe (3) is sealed to the feed inlet provided on the top of the filter box (2). A filter (4) is provided inside the filter box (2). A collection hopper (5) is provided below the filter (4). A discharge pipe (6) is provided at the lower end of the collection hopper (5). An installation hole is provided at the bottom of the filter box (2). The discharge pipe passes through the installation hole and is sealed to the installation hole. The upper end of the discharge pipe (6) is connected to the discharge port of the collection hopper. The lower end of the discharge pipe is connected to the screw pump (7) provided below the filter box (2). The discharge port of the screw pump (7) is connected to the conveying pipe (8).

2. The polyvinylidene fluoride foam liquid conveying device according to claim 1, characterized in that, The filter (4) is cone-shaped, and multiple axially distributed filter holes (41) are provided on the cone surface of the filter (4) along the circumferential direction.

3. The polyvinylidene fluoride foam liquid conveying device according to claim 1, characterized in that, Multiple annular spray pipes (22) are concentrically arranged at the top of the filter box (2). Each annular spray pipe (22) is connected by a radially arranged connecting pipe (23). The connecting pipe (23) is connected to a booster pump arranged outside the filter box (2) through a first pipe (21). The booster pump is connected to the outlet of the pure water tank through a second pipe. Each annular spray pipe (22) has a spray port at the bottom and is connected to a nozzle (24).

4. The polyvinylidene fluoride foam liquid conveying device according to claim 1, characterized in that, A control valve (61) is provided at the lower end of the discharge pipe (6), and the control valve (61) is sealed to the feed port of the screw pump (7) through a pipe.

5. The polyvinylidene fluoride foam liquid conveying device according to claim 1, characterized in that, A spiral shaft (31) is coaxially arranged inside the feed tube (3), and a spiral blade (32) is arranged on the spiral shaft (31). The spiral blade (32) is fixedly sleeved on the spiral shaft (31), and the outer edge of the spiral blade (32) is sealed and fixed to the inner wall of the feed tube (3).

6. The polyvinylidene fluoride foam liquid conveying device according to claim 3, characterized in that, The filter box (2) is provided with a venting port on its side wall, and the outer end of the venting port is connected to a venting pipe (25).

7. The polyvinylidene fluoride foam liquid conveying device according to claim 2, characterized in that, The filter (4) has an annular boss (42) on its conical side surface along the circumferential direction.

8. The polyvinylidene fluoride foam liquid conveying device according to claim 7, characterized in that, The filter (4) is set with a flat top, and a horizontal fixing plate (43) is set on the flat top. Multiple vertical poles (44) are arranged in an array on the fixing plate (43), and the upper end of the poles (44) is set with a conical tip.

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