Polyphenylene sulfide vacuum filtration drying device

Abstract

The utility model relates to vacuum drying equipment technical field, concretely is a kind of polyphenyl sulfide vacuum filtration drying device, including shell;Gas extraction mechanism and filter drying mechanism are equipped on the shell;The filter drying mechanism includes support cylinder, and the support cylinder is fixedly connected in the shell interior, and the support cylinder side surface is equipped with through-hole, and the support cylinder outside is equipped with heating device. Through the integrated structure of setting can realize the filtration and drying operation of polyphenyl sulfide in single support cylinder, avoids the operation of transferring polyphenyl sulfide between different equipment, improves the production efficiency of polyphenyl sulfide, meanwhile, the oxidation of polyphenyl sulfide caused by the contact with air during transfer can be avoided, and the quality of polyphenyl sulfide product is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum drying equipment technology, specifically a vacuum filtration and drying device for polyphenylene sulfide. Background Technology

[0002] Polyphenylene sulfide (PPS), as a high-performance specialty engineering plastic, relies heavily on post-processing in its production for product purity, molecular weight stability, and energy consumption control. Slurry dehydration and solvent removal drying are two core steps. Traditional processes typically employ separate equipment, using a filter press to separate the polymerized slurry into solid and liquid phases, forming a wet filter cake which is then transferred to a drying unit. However, this step-by-step operation results in repeated exposure of PPS to air, easily causing oxidation and leading to a darker color, fluctuating mechanical properties, and a decrease in the yield of high-purity electronic-grade PPS. Therefore, we propose a vacuum filtration and drying device for PPS. Utility Model Content

[0003] The purpose of this utility model is to provide a vacuum filtration and drying device for polyphenylene sulfide, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A vacuum filtration and drying apparatus for polyphenylene sulfide includes a housing;

[0006] The outer casing is equipped with an air extraction mechanism and a filtration and drying mechanism;

[0007] The filtration and drying mechanism includes a support cylinder, which is fixedly connected inside the outer shell. The support cylinder has a through hole on its side and a heating device is sleeved on the outside of the support cylinder.

[0008] Preferably, a support tube is fixedly connected to the bottom end of the support cylinder, the support tube is fixedly connected to the bottom end inside the outer shell, a leakage groove is opened on the inner wall of the support cylinder, and the through hole is opened on the side of the leakage groove.

[0009] Preferably, a mesh bag is fixedly connected to the inner wall of the support cylinder, a filter cloth is movably connected inside the mesh bag, and a sealing cap is detachably connected to the top of the support cylinder.

[0010] Preferably, a connecting pipe is fixedly connected to the top of the sealing cap, an airbag is movably connected inside the connecting pipe, an air inlet pipe is fixedly connected to one end of the airbag, and the air inlet pipe is slidably connected inside the connecting pipe.

[0011] Preferably, a limiting ring is fixedly connected inside the connecting pipe and outside the air intake pipe, and a return spring is fixedly connected between the limiting rings.

[0012] Preferably, the air extraction mechanism includes a waste liquid cylinder fixedly connected to the bottom of the outer shell, and an air pump fixedly connected to the outer wall of the outer shell, the air pump being interconnected with the interior of the outer shell through a pipe.

[0013] Preferably, a liquid storage tank is fixedly connected to the top of the outer shell, a piston is slidably connected inside the liquid storage tank, a movable tube is fixedly connected to the top of the piston, an opening is opened on the side of the movable tube, and a sleeve is slidably connected to the outside of the movable tube, the sleeve communicating with the inside of the outer shell.

[0014] By employing the above technical solution, this utility model provides a polyphenylene sulfide vacuum filtration and drying device that has at least the following beneficial effects:

[0015] (1) The present invention can achieve the filtration and drying of polyphenylene sulfide in a single support cylinder through the integrated structure, which avoids the operation of transferring polyphenylene sulfide between different equipment, improves the production efficiency of polyphenylene sulfide, and avoids the oxidation of polyphenylene sulfide caused by contact with air during transfer, thus improving the quality of polyphenylene sulfide products.

[0016] (2) The present invention uses a piston-type liquid storage structure to move the piston during cleaning and filtration, and uses the structure to position the piston after the filtration operation is completed. This reduces the air pressure inside the support cylinder and activates the airbag through the pressure difference to achieve secondary filtration of the filter cake. The combination of filtration and pressure filtration improves the filtration effect of polyphenylene sulfide and improves the efficiency of subsequent drying by reducing the amount of liquid on the surface of polyphenylene sulfide. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the internal structure of the present invention. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the internal structure of the present invention. Figure 2 .

[0022] In the diagram: 1. Outer shell; 2. Vacuuming mechanism; 201. Waste liquid cylinder; 202. Air pump; 203. Storage tank; 204. Piston; 205. Moving pipe; 206. Sleeve; 3. Filtering and drying mechanism; 301. Support cylinder; 302. Through hole; 303. Heating device; 304. Support pipe; 305. Leakage tank; 306. Net bag; 307. Sealing cap; 308. Connecting pipe; 309. Airbag; 310. Air inlet pipe; 311. Limiting ring; 312. Return spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] A vacuum filtration and drying device for polyphenylene sulfide, such as Figures 1-4 As shown, it includes a housing 1; a filtration and drying mechanism 3 on the housing 1, which can perform integrated filtration and drying of polyphenylene sulfide, thereby avoiding the operation of transferring polyphenylene sulfide between different devices and improving the production efficiency of polyphenylene sulfide.

[0026] Specifically, the filtration and drying mechanism 3 includes a support cylinder 301, which is fixedly connected inside the outer shell 1. A through hole 302 is provided on the side of the support cylinder 301, and a heating device 303 is sleeved on the outside of the support cylinder 301. The structure of the support cylinder 301 can load polyphenylene sulfide, which is convenient for vacuum filtration and subsequent drying operations. The structure of the through hole 302 allows the inside of the support cylinder 301 to communicate with the inside of the outer shell 1. Thus, after the air pressure inside the outer shell 1 drops, the residual air inside the support cylinder 301 can be used to filter the polyphenylene sulfide. At the same time, the heating device 303 can heat the support cylinder 301 and the polyphenylene sulfide particles inside. The heating device 303 is a resistance heating device 303 or an induction heating device 303. In this embodiment, the heating device 303 is selected as an induction heating coil.

[0027] In addition, a support tube 304 is fixedly connected to the bottom end of the support cylinder 301. The support tube 304 is fixedly connected to the bottom end of the inner shell 1. A leakage groove 305 is opened on the inner wall of the support cylinder 301, and a through hole 302 is opened on the side of the leakage groove 305. The structure of the support tube 304, together with the leakage groove 305, can guide the filtered solvent or water downward to separate it from the polyphenylene sulfide particles. The through hole 302 opened on the side wall can reduce the distance of solvent splashing outward due to sudden pressure drop, which facilitates subsequent cleaning. The outer wall of the leakage groove 305 is a strip structure and is fixed to the support cylinder 301, so that the support cylinder 301 forms a petal-shaped structure, and the through hole 302 is opened on the opposite side of the outer wall of the strip structure of the leakage groove 305.

[0028] It is worth noting that a mesh bag 306 is fixedly connected to the inner wall of the support cylinder 301, and a filter cloth is movably connected inside the mesh bag 306. A sealing cap 307 is detachably connected to the top of the support cylinder 301. The structure of the mesh bag 306 can shape the filter cloth, so that the filter cloth corresponds to the structure of the mesh bag 306, avoiding the filter cloth from being too close to the inner wall of the support cylinder 301 and affecting the filtration effect. The filter cloth can block polyphenylene sulfide, and the structure of the sealing cap 307 can seal the support cylinder 301, making it convenient to disassemble and inspect the inside of the support cylinder 301.

[0029] Furthermore, a connecting pipe 308 is fixedly connected to the top of the sealing cap 307, and an airbag 309 is movably connected inside the connecting pipe 308. An air inlet pipe 310 is fixedly connected to one end of the airbag 309, and the air inlet pipe 310 is slidably connected inside the connecting pipe 308.

[0030] A limiting ring 311 is fixedly connected inside the connecting pipe 308 and outside the air inlet pipe 310. A return spring 312 is fixedly connected between the limiting rings 311. The structure of the connecting pipe 308 can load the airbag 309 and the air inlet pipe 310. The airbag 309 can move downward and continue to expand after the air pressure inside the support cylinder 301 decreases. The pressure of the outer wall of the airbag 309 is balanced to filter the polyphenylene sulfide and reduce the residual moisture between the polyphenylene sulfide. The structure of the air inlet pipe 310 can automatically inject air into the airbag 309. The return spring 312 can automatically rebound to store the airbag 309 after the internal air pressure is restored.

[0031] The top of the outer shell 1 is provided with a discharge pipe, which is sleeved on the outside of the connecting pipe 308. The top of the connecting pipe 308 passes through the discharge pipe. The discharge pipe is equipped with a solenoid valve, and the discharge pipe remains closed during filtration and drying.

[0032] Example 2

[0033] like Figures 1-4As shown, based on Embodiment 1, the outer shell 1 is provided with an air extraction mechanism 2. The air extraction mechanism 2 is used to extract the air inside the outer shell 1, so that a low-pressure or near-vacuum environment is formed inside the outer shell 1, thereby quickly separating the liquid on the surface of polyphenylene sulfide from the polyphenylene sulfide particles.

[0034] In this embodiment, the air extraction mechanism 2 includes a waste liquid cylinder 201 fixedly connected to the bottom of the outer shell 1. An air pump 202 is fixedly connected to the outer wall of the outer shell 1. The air pump 202 is interconnected with the interior of the outer shell 1 through a pipe. The waste liquid cylinder 201 can collect the filtered waste liquid. The waste liquid cylinder 201 is fixed to the outer shell 1 and interconnected with the interior of the outer shell 1. The bottom center of the interior of the outer shell 1 has a concave structure, which can guide the liquid flowing out from the through hole 302 into the interior of the waste liquid cylinder 201. The end of the support pipe 304 is interconnected with the interior of the waste liquid cylinder 201, which can collect the normally filtered liquid. The air pump 202 can extract the air from the interior of the outer shell 1 and the waste liquid cylinder 201, so as to create a low-pressure environment inside the outer shell 1.

[0035] In addition, a liquid storage tank 203 is fixedly connected to the top of the outer shell 1. A piston 204 is slidably connected inside the liquid storage tank 203. A moving tube 205 is fixedly connected to the top of the piston 204. An opening is provided on the side of the moving tube 205. A sleeve 206 is slidably connected to the outside of the moving tube 205. The sleeve 206 is interconnected with the inside of the outer shell 1. The structure of the liquid storage tank 203 can store the cleaning fluid of polyphenylene sulfide and facilitate the extraction of the cleaning fluid through the moving tube 205. At the same time, the sleeve 206 is a three-way pipe structure or a normal pipe structure. When the sleeve 206 is a normal pipe, the sleeve 206 and the liquid storage tank 203 are detachably connected, which facilitates the installation and sealing to the liquid storage tube after polyphenylene sulfide is introduced through the sleeve 206. In this embodiment, the sleeve 206 is a three-way pipe and a three-way valve is provided in the middle of the sleeve 206.

[0036] In use, the polyphenylene sulfide (PPS) vacuum filtration and drying device of this invention first opens the sleeve 206 through the three-way valve, connecting the support cylinder 301 to the PPS. Then, the air pump 202 starts and draws the PPS into the support cylinder 301. Because the interior of the outer shell 1 is under low pressure due to the air pump 202, the solvent in the PPS sulfide turbid liquid flows downwards along the support tube 304 through the filter cloth. Since the filter cloth has a better filtration effect in the initial stage, the solvent passes through the filter cloth quickly, resulting in good filtration of the PPS sulfide turbid liquid in the initial stage. Therefore, it is not necessary to precisely control the amount of PPS introduced. After the set amount of PPS is drawn in, the three-way valve closes, connecting the support cylinder 301 to the storage tank 203. Subsequently, because the interior of the outer shell 1 remains under low pressure, the cleaning fluid in the storage tank 203 continuously flows into the support cylinder 301 to clean the solvent in the PPS. The cleaning fluid in the storage tank 203 is filled to half or one-third of its effective capacity. Therefore, after the cleaning fluid is used up, the residual air in the storage tank 203 is drawn into the support cylinder 301 to remove the cleaning water from the surface of the polyphenylene sulfide. The piston 204 in the storage tank 203 can slide inside the storage tank 203, and the bottom of the storage tank 203 is connected to the external environment. Therefore, after the air at the top of the piston 204 and the stored cleaning fluid are used up, the top of the piston 204 becomes a low-pressure area, while the normal-pressure area at the bottom pushes the piston 204 upward. At this time, the moving pipe 205, which guides the flow of liquid, can guide the movement of the piston 204. When the piston 204 moves to the top of the storage tank 203, the air pressure inside the support cylinder 301 continues to drop. At this time, the airbag 309 and the air inlet pipe 310 move downward under the pressure of the external environment. Under atmospheric pressure, the airbag 309 moves into the support cylinder 301 and continues to expand until its surface contacts the polyphenylene sulfide (PPS). The pressure difference between the inside and outside of the airbag 309 filters the PPS, further reducing residual moisture. After filtration, the heating device 303 activates and heats the PPS inside the support cylinder 301, allowing the cleaning solution on the PPS surface to evaporate quickly. Since the airbag 309 is connected to the external environment, heating does not cause it to expand again.After drying is completed, the air pump 202 is turned off, and the air pressure inside the outer shell 1 continues to return to the external atmospheric pressure. At this time, the air inlet pipe 310 moves upward along the connecting pipe 308 under the elastic action of the return spring 312, while the surface of the air bag 309 moves along the side wall of the connecting pipe 308. The opening of the connecting pipe 308 scrapes off the polyphenylene sulfide particles adhering to the surface of the air bag 309. After drying is completed, the heating is turned off and cooled to a safe temperature. The vacuum inside the outer shell 1 is released, and nitrogen is filled in to maintain high pressure. Nitrogen can reduce the oxidation of polyphenylene sulfide caused by contact with oxygen. At this time, since the inside of the support cylinder 301 is under normal pressure, the nitrogen filled in squeezes the filter cloth towards the discharge pipe through air pressure. The pressure difference formed by the continuous suction of the discharge pipe will extract the dried polyphenylene sulfide. At the same time, the pressure difference inside and outside the filter cloth will squeeze and deform the filter cloth, thereby breaking up the polyphenylene sulfide that may be caking. At the same time, the support cylinder 301 under normal pressure can prevent the air bag 309 from expanding into the support cylinder 301 and affecting the discharge operation.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum filtration and drying device for polyphenylene sulfide, comprising a housing (1), characterized in that: The outer casing (1) is provided with an air extraction mechanism (2) and a filter drying mechanism (3); The filtration and drying mechanism (3) includes a support cylinder (301), which is fixedly connected inside the outer shell (1). A through hole (302) is provided on the side of the support cylinder (301), and a heating device (303) is sleeved on the outside of the support cylinder (301).

2. The polyphenylene sulfide vacuum filtration and drying device according to claim 1, characterized in that: The bottom end of the support cylinder (301) is fixedly connected to the support tube (304), the support tube (304) is fixedly connected to the bottom end of the inner shell (1), the inner wall of the support cylinder (301) is provided with a leakage groove (305), and the through hole (302) is opened on the side of the leakage groove (305).

3. The polyphenylene sulfide vacuum filtration and drying device according to claim 1, characterized in that: A mesh bag (306) is fixedly connected to the inner wall of the support cylinder (301), and a filter cloth is movably connected inside the mesh bag (306). A sealing cap (307) is detachably connected to the top of the support cylinder (301).

4. The polyphenylene sulfide vacuum filtration and drying device according to claim 3, characterized in that: The top of the sealing cap (307) is fixedly connected to a connecting pipe (308), and an airbag (309) is movably connected inside the connecting pipe (308). One end of the airbag (309) is fixedly connected to an air inlet pipe (310), and the air inlet pipe (310) is slidably connected inside the connecting pipe (308).

5. The polyphenylene sulfide vacuum filtration and drying apparatus according to claim 4, characterized in that: A limiting ring (311) is fixedly connected inside the connecting pipe (308) and outside the air inlet pipe (310), and a return spring (312) is fixedly connected between the limiting rings (311).

6. The polyphenylene sulfide vacuum filtration and drying apparatus according to claim 1, characterized in that: The air extraction mechanism (2) includes a waste liquid cylinder (201) fixedly connected to the bottom of the outer shell (1), and an air pump (202) fixedly connected to the outer wall of the outer shell (1). The air pump (202) is connected to the interior of the outer shell (1) through a pipe.

7. The polyphenylene sulfide vacuum filtration and drying apparatus according to claim 1, characterized in that: A liquid storage tank (203) is fixedly connected to the top of the outer shell (1). A piston (204) is slidably connected inside the liquid storage tank (203). A moving tube (205) is fixedly connected to the top of the piston (204). An opening is provided on the side of the moving tube (205). A sleeve (206) is slidably connected to the outside of the moving tube (205). The sleeve (206) is in communication with the inside of the outer shell (1).

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