A TPV underwater pellet cutting backwater filtering device

Abstract

This utility model discloses a TPV underwater pelletizing return water filtration device, belonging to the field of water filtration technology. It addresses the problems of traditional filtration devices, which are mostly single-unit filters, requiring machine shutdown for cleaning during the filtration process, thus affecting production continuity; and the poor backwashing effect, easily leaving impurities, reducing filtration efficiency and service life. The device includes an inlet pipe and an outlet pipe, with a switchable filter (Filter 1 and Filter 2) installed between them. A flushing pipe is installed on the outlet pipe to supply water for backwashing Filter 1 and Filter 2, enabling switching between filter units. This ensures that the TPV underwater pelletizing production process can complete filter element cleaning without stopping the machine, guaranteeing production continuity. The optimized backwashing structure and control logic improve the backwashing effect, efficiently removing filter impurities, maintaining stable filtration performance, and extending the device's service life. Through a reasonable structural design, the sealing and stability of the filtration device are enhanced.

Description

Technical Field

[0001] A TPV underwater pelletizing and recycle water filtration device is disclosed. This utility model belongs to the field of water filtration technology, specifically relating to the field of TPV underwater pelletizing and recycle water filtration technology. Background Technology

[0002] In the underwater pelletizing process of TPV, the pelletizing step introduces impurities such as plastic debris and additive residues into the recycled water. If these impurities are not effectively filtered, they will enter the subsequent cooling and circulation systems with the recycled water, causing equipment blockage and wear, reducing heat exchange efficiency, and even affecting the appearance and performance of TPV products.

[0003] Traditional backwash filtration devices typically employ a single filter unit, which presents significant drawbacks: First, filter unit clogging necessitates shutdown for disassembly and cleaning, frequent downtime drastically reducing production continuity and increasing time costs. Second, the simple backwashing structure design often results in uneven water flow distribution and inadequate sealing, leading to impurity residue. This not only reduces filtration efficiency but also accelerates filter element aging, shortens their lifespan, and increases equipment maintenance costs. Therefore, developing a backwash filtration device with filter unit switching capabilities and superior backwashing performance is of great significance for TPV underwater pelletizing production. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a TPV underwater pelletizing and recycling water filtration device. This solves the problems that traditional filtration devices are mostly single filtration units, which require shutdown for cleaning during the filtration process, affecting the continuity of production; and that the backwashing effect is poor, easily leaving impurities, reducing filtration efficiency and service life.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A TPV underwater pelletizing and backwashing filtration device includes an inlet pipe and an outlet pipe. A filter one and a filter two that can be switched are installed between the inlet pipe and the outlet pipe. A flushing pipe for supplying water to the filter one and filter two during backwashing is installed on the outlet pipe. A drain pipe for discharging the flushing water is installed on the inlet pipe.

[0006] As a preferred embodiment of this utility model, both filter one and filter two include an outer tube, a filter tube is sleeved inside the outer tube, a connecting plug is installed at the bottom end of the filter tube, a connecting seat is installed inside the outer tube at the position corresponding to the connecting plug, an outer sleeve is installed on the top end of the filter tube, and an inner ring that cooperates with and connects to the outer sleeve is installed on the inner wall of the outer tube.

[0007] As a preferred embodiment of this utility model, a pressure plate covering the top of the inner ring is installed at the top of the filter tube, a sealing ring is installed on the surface of the pressure plate corresponding to the inner ring, and a snap-fit ​​is provided on the inner wall of the outer sleeve.

[0008] As a preferred embodiment of this utility model, a solenoid valve is provided between the water inlet pipe and the first filter, and between the first filter and the water outlet pipe; a solenoid valve is provided between the water inlet pipe and the second filter, and between the second filter and the water outlet pipe.

[0009] As a preferred embodiment of this utility model, a solenoid valve three is installed on both the drain pipe and the flushing pipe for backflushing the first filter, and a solenoid valve four is installed on both the drain pipe and the flushing pipe for backflushing the second filter.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by setting up parallel filter one and filter two, and with the precise control of solenoid valve one and solenoid valve two, when a single filter needs backwashing or maintenance, it can quickly switch to the operation of another filter without stopping the machine, which significantly improves the continuity of TPV underwater pelletizing production, reduces the production capacity loss caused by equipment maintenance, and adapts to the needs of large-scale, continuous production.

[0011] The filter features a nested structure of outer tube and filter tube, combined with a multi-seal design of connecting plug-connecting seat, inner ring-outer ring, pressure plate-sealing ring, effectively preventing leakage of unfiltered water and ensuring filtration accuracy. The porous structure of the filter tube can be customized according to the characteristics of impurities in the TPV pelletized return water, accurately intercepting impurities and outputting clean return water to meet the water quality requirements of subsequent processes.

[0012] The backwashing system is controlled by solenoid valves three and four, which can backwash filter one or filter two separately. The reverse water flow can effectively impact the impurities trapped in the filter tubes, and the impurities are quickly discharged with the drain pipe. The cleaning is thorough, which can quickly restore the filtration performance of the filter tubes, extend their service life, and reduce the frequency and cost of filter element replacement.

[0013] The fit between the filter's connecting plug and connecting seat, and between the outer sleeve and inner ring, provides reliable axial and radial support for the filter tube. It can maintain stable installation even under pressure changes during filtration and backwashing, ensuring the long-term reliable operation of the device.

[0014] The snap-fit ​​design on the inner wall of the outer casing allows for easy disassembly and assembly of the filter tubes without the need for complicated tools. Operators can quickly clean and replace the filter tubes, reducing maintenance difficulty and time costs. At the same time, the backwashing function can remove most impurities online, reducing the frequency of manual cleaning. Attached Figure Description

[0015] Figure 1This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional bottom structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; 1-Inlet pipe; 11-Solenoid valve one; 2-Outlet pipe; 21-Solenoid valve two; 3-Filter one; 31-Outer pipe; 32-Filter pipe; 33-Connecting plug; 34-Connecting seat; 35-Inner ring; 36-Outer sleeve; 37-Pressure plate; 38-Bayonet; 39-Sealing ring; 4-Filter two; 5-Connecting flange; 6-Drain pipe; 7-Flush pipe; 8-Solenoid valve three; 9-Solenoid valve four. Detailed Implementation

[0016] 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.

[0017] Please see Figure 1-3 This utility model provides a technical solution: A TPV underwater pelletizing and backwashing filtration device mainly consists of an inlet pipe 1, an outlet pipe 2, a first filter 3, a second filter 4, a drain pipe 6, a flushing pipe 7, and various solenoid valves. All components work together to achieve the functions of backwashing and filtration.

[0018] Water inlet pipe 1 and water outlet pipe 2: Water inlet pipe 1 serves as the input channel for the return water from underwater pelletizing of the TPV, introducing the return water containing impurities into the device; water outlet pipe 2 is used to discharge the filtered and clean return water so that it can enter the subsequent circulation or treatment system.

[0019] Filter 1 (3) and Filter 2 (4): These are the core filtration units, set up in parallel. They can be switched to work individually or alternately to ensure uninterrupted filtration.

[0020] Sewage pipe 6 and flushing pipe 7: Sewage pipe 6 is used to discharge sewage carrying impurities during the backwashing process; flushing pipe 7 is connected to water outlet pipe 2 to provide clean water for backwashing, backwashing the filter unit and removing trapped impurities.

[0021] Filter detailed structure Filter 1 (3) and Filter 2 (4) have the same structure, both employing a nested inner and outer tube design and multiple sealing features to ensure filtration efficiency and structural stability. Specifically, they include: Outer tube 31: As the external support structure of the filter, it provides installation space for filter tube 32. Its material is selected from corrosion-resistant and pressure-bearing metals or engineering plastics such as stainless steel 304, PVC-U, etc. It can be selected according to the TPV production conditions and return water medium characteristics to ensure long-term stable operation under return water pressure and chemical environment.

[0022] Filter tube 32: This is the core filter element, which is fitted inside the outer tube 31. It adopts a porous structure such as sintered mesh, woven mesh or filter element. The pore size is designed according to the particle size of impurities in the TPV pelletized water return, and can generally be controlled within 10-100μm to intercept impurities in the return water.

[0023] Connecting plug 33 and connecting seat 34: Connecting plug 33 is installed at the bottom of filter tube 32, and connecting seat 34 is set at the corresponding position inside outer tube 31. The two adopt a nested, sealed connection, such as conical surface fit + sealing ring, to ensure the installation stability of filter tube 32 under filtration and backwashing pressure and prevent water leakage.

[0024] Inner ring 35 and outer sleeve 36: The outer sleeve 36 is installed on the outside of the top of the filter tube 32, and the inner ring 35 is correspondingly set on the inner wall of the outer tube 31. The outer sleeve 36 and the inner ring 35 adopt an interference fit or a groove fit to further enhance the connection and sealing of the filter tube 32 and the outer tube 31, and prevent unfiltered water from leaking from the top.

[0025] Pressure plate 37 and sealing ring 39: Pressure plate 37 is installed at the top of filter tube 32, covering the top of inner ring 35. Sealing ring 39, such as O-ring or lip ring, is installed on the side of pressure plate 37 facing inner ring 35. The material is oil-resistant and corrosion-resistant rubber, such as fluororubber. Through the clamping force of pressure plate 37, sealing ring 39 is tightly fitted to inner ring 35, improving the sealing effect at the top of filter unit and preventing leakage of unfiltered water.

[0026] Slots 38: These are located on the inner wall of the outer casing 36 and are typically 2-4 in number, arranged circumferentially. They provide operating points for the installation and removal of the filter tube 32. During installation, tools can be used to snap the filter tube 32 into the slots 38, and the filter tube 32 can be rotated or pulled to achieve quick assembly with the outer tube 31. The same applies to disassembly, facilitating deep cleaning or replacement of the filter tube 32.

[0027] Solenoid valve control logic To enable filter unit switching and precise backwashing, the device is equipped with multiple sets of solenoid valves, which are controlled by logic to achieve different operating states: Solenoid valve 11 and solenoid valve 21: Solenoid valve 11 is installed between inlet pipe 1 and filter 3, and between filter 3 and outlet pipe 2; solenoid valve 21 is installed between inlet pipe 1 and filter 4, and between filter 4 and outlet pipe 2. Solenoid valves 11 and 21 are normally closed / normally open solenoid valves, and their initial states can be set according to control requirements. Generally, during filtration operation, the solenoid valve corresponding to the working filter is open, and the one not in use is closed. By controlling their open / closed state, it is determined whether the return water flows through filter 3 or filter 4. For example, when filter 3 needs to be activated, solenoid valve 11 is opened between inlet pipe 1 and filter 3, and between filter 3 and outlet pipe 2, while solenoid valve 21 corresponding to filter 4 is closed, so that the return water only passes through filter 3; conversely, filter 4 can be switched to operation.

[0028] Solenoid valves 3-8 and 4-9: Solenoid valve 3-8 is installed on the drain pipe 6 and flushing pipe 7 for backwashing filter 1-3; solenoid valve 4-9 is installed on the drain pipe 6 and flushing pipe 7 for backwashing filter 2-4. Solenoid valves 3-8 and 4-9 are dedicated backwashing control solenoid valves, which are closed during normal filtration. When the corresponding filter needs backwashing, solenoid valve 3-8 or solenoid valve 4-9 is opened, allowing clean water from flushing pipe 7 to flow back into the filter, carrying impurities and being discharged through drain pipe 6.

[0029] Working principle Normal Filtering Mode After the system starts, the differential pressure between the filter inlet and outlet can be monitored using differential pressure sensors based on the initial production settings or real-time monitoring of the filter unit status to determine if there is blockage. If the differential pressure exceeds the set threshold, switching / backwashing is required. This part can be used as an extended intelligent control module, selecting either filter 3 or filter 4 to operate. Taking filter 3 as an example: The solenoid valve 11 controlling the inlet pipe 1-filter 3 and the outlet pipe 2 of filter 3 is opened, and the solenoid valve 21 corresponding to filter 4 is closed.

[0030] The TPV underwater pelletizing return water flows into filter 3 from the inlet pipe 1, and enters the interior of filter 32 through the gap between the outer pipe 31 and the filter pipe 32. Alternatively, depending on the structure of the filter pipe 32, it can also flow from the outside of the filter pipe 32 into the inside. Impurities are intercepted by the filter pipe 32, and clean water passes through the filter pipe 32 and is discharged through the outlet pipe 2 to enter the subsequent process.

[0031] Backwash mode After filter 3 has been running for a period of time, if the pressure difference between the inlet and outlet of filter tube 32 increases due to the trapping of impurities or the set backwashing time is reached, backwashing is required. The process is as follows: Close the solenoid valve 11 connecting the inlet pipe 1 to the filter 3 and the outlet pipe 2 to cut off the normal flow between the filter 3 and the inlet pipe 1 and the outlet pipe 2.

[0032] Open the solenoid valve 8 corresponding to filter 3 to connect the flushing pipe 7 and the drain pipe 6 to filter 3.

[0033] Clean water in outlet pipe 2 flows back into filter 3 through flushing pipe 7. The water flow direction is opposite to that of normal filtration. It impacts the impurities trapped on the surface and inside of filter pipe 32, causing the impurities to detach from filter pipe 32 and be discharged from the device through drain pipe 6 with the water flow.

[0034] The backwashing duration can be set according to the actual working conditions. For example, after 1-5 minutes, close solenoid valve 38 and open solenoid valve 11, and filter 13 will resume normal filtration mode. If the backwashing target is filter 24, then operate solenoid valve 21 and solenoid valve 49 in the same way.

[0035] Filter unit switching mode If maintenance or backwashing of filter 2 (4) is required, or if filter 1 (3) needs to be idle for an extended period, perform the switching operation: If filter 3 is in operation, first backwash it according to the backwashing procedure described above or directly close solenoid valve 11, and then close solenoid valve 11 of filter 3.

[0036] Open the solenoid valve 21 corresponding to the inlet pipe 1-filter 24 and the outlet pipe 2 of filter 24 to switch the return water to filter 24 for filtration, so as to realize the uninterrupted switching of the filtration unit and ensure the continuous operation of TPV underwater pelletizing production.

[0037] Component Selection and Manufacturing: Pipes and Valve Bodies: Inlet pipe 1, outlet pipe 2, sewage pipe 6, and flushing pipe 7 are made of materials that meet industrial pipeline standards, such as stainless steel 304 or 316L. The selection is based on the corrosiveness of the return water. The pipe diameter is generally calculated according to the TPV underwater pelletizing return water volume design, which can be calculated using the flow formula (Q=vA), where Q is the return water volume, v is the economic flow velocity, and A is the pipe cross-sectional area. The economic flow velocity for industrial return water is generally taken as 1-2 m / s. Solenoid valves 11, 21, 8, and 9 are made of corrosion-resistant and pressure-bearing solenoid valves. The voltage, diameter, and other parameters are compatible with the pipeline to ensure that the flow rate meets the requirements of filtration and backwashing. Filter components: The outer tube 31 is made of seamless stainless steel or engineering plastic tubing, with precision machining of the inner wall to ensure installation accuracy with components such as the inner ring 35 and connecting seat 34; the filter tube 32 uses appropriate filter material and pore size according to the characteristics of impurities, such as multi-layer sintered stainless steel mesh, formed by mold pressing or weaving; metal components such as the connecting plug 33, connecting seat 34, inner ring 35, outer sleeve 36, and pressure plate 37 can be machined and treated with anti-rust and anti-corrosion treatments such as galvanizing and passivation; the sealing ring 39 uses suitable rubber material and is pressed according to standard molds. Assembly process: Install and fix the connecting seat 34 to the bottom of the outer tube 31, ensuring a firm installation and coaxiality. Install the connecting plug 33 at the bottom of the filter tube 32 with the connecting seat 34 inside the outer tube 31, adjusting the position to make the filter tube 32 coaxial with the outer tube 31. Install the outer sleeve 36 on the outside of the top of the filter tube 32, so that the outer sleeve 36 mates with the inner ring 35 on the inner wall of the outer tube 31, and check the fit clearance and sealing performance. Install pressure plate 37 at the top of filter tube 32, ensuring that the sealing ring 39 on pressure plate 37 fits tightly with the inner ring 35. Secure pressure plate 37 with bolts or clips if it is a detachable structure. Check if the bayonet 38 is normal to ensure smooth subsequent maintenance operations. Assembly of the entire device: Connect the assembled filters 1 (3) and 2 (4) to the inlet pipe 1 and outlet pipe 2 according to the design layout. Weld or flange the pipe interfaces to ensure a leak-free seal. Install solenoid valve 1 (11) and solenoid valve 2 (21) at the corresponding pipe interfaces. Install solenoid valve 3 (8) and solenoid valve 4 (9) at the connection points between the drain pipe 6, flushing pipe 7, and the filter, and connect the electrical control lines. Connect drain pipe 6 and flushing pipe 7, ensuring the pipeline routing is reasonable and the support is firm. Commissioning and operation: Test the sealing performance by closing all outlets and introducing a test medium such as clean water at a certain pressure into the inlet pipe 1. Check for leaks in the filter, pipe interfaces, solenoid valves, etc. If leaks are found, adjust the seals or connections promptly. Functional debugging: Open solenoid valve 11 of filter 3 separately and close solenoid valve 21 of filter 4 to test the normal filtration process. Observe whether the water outlet pipe 2 is smooth and clean. Start the backwashing program and test whether solenoid valves 8 and 9 open and close normally, whether the backwash water flow is stable, whether the drain pipe 6 drains smoothly, and check the cleaning effect of filter pipe 32 after backwashing.Test the filter unit switching function and observe whether the water flow transitions smoothly during the switching process, and whether there are any interruptions or leaks. Formal Operation: After successful commissioning, connect to the TPV underwater pelletizing and return water system. Based on the actual return water flow rate, impurity content, and other parameters, set the filtration and backwashing time and differential pressure thresholds.

[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 TPV underwater pelletizing and recycling water filtration device, comprising an inlet pipe (1) and an outlet pipe (2), characterized in that: A filter 1 (3) and a filter 2 (4) that can be switched are installed between the inlet pipe (1) and the outlet pipe (2). A flushing pipe (7) for supplying water to the filter 1 (3) and the filter 2 (4) during backwashing is installed on the outlet pipe (2). A drain pipe (6) for discharging the flushing water is installed on the inlet pipe (1). Both the filter 1 (3) and the filter 2 (4) include an outer pipe (31). A filter tube (32) is sleeved inside the outer pipe (31). A connecting plug is installed at the bottom end of the filter tube (32). (33) A connecting seat (34) is installed inside the outer tube (31) at the position corresponding to the connecting plug (33). An outer sleeve (36) is installed on the outside of the top end of the filter tube (32). An inner ring (35) that cooperates with the outer sleeve (36) is installed on the inner wall of the outer tube (31). A pressure plate (37) covering the top end of the inner ring (35) is installed on the top end of the filter tube (32). A sealing ring (39) is installed on the surface of the pressure plate (37) corresponding to the inner ring (35). A bayonet (38) is opened on the inner wall of the outer sleeve (36).

2. The TPV underwater pelletizing and recycling water filtration device according to claim 1, characterized in that: Solenoid valve 1 (11) is provided between the water inlet pipe (1) and filter 1 (3) and between filter 1 (3) and water outlet pipe (2), and solenoid valve 2 (21) is provided between the water inlet pipe (1) and filter 2 (4) and between filter 2 (4) and water outlet pipe (2).

3. The TPV underwater pelletizing and recycling water filtration device according to claim 1, characterized in that: Solenoid valve 3 (8) is installed on the drain pipe (6) and flushing pipe (7) for backflushing the filter 1 (3), and solenoid valve 4 (9) is installed on the drain pipe (6) and flushing pipe (7) for backflushing the filter 2 (4).

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